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));
353 ndev->cnf.mtu6 = dev->mtu;
354 ndev->cnf.sysctl = NULL;
355 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
356 if (!ndev->nd_parms) {
360 if (ndev->cnf.forwarding)
361 dev_disable_lro(dev);
362 /* We refer to the device */
365 if (snmp6_alloc_dev(ndev) < 0) {
367 "%s: cannot allocate memory for statistics; dev=%s.\n",
368 __func__, dev->name);
369 neigh_parms_release(&nd_tbl, ndev->nd_parms);
375 if (snmp6_register_dev(ndev) < 0) {
377 "%s: cannot create /proc/net/dev_snmp6/%s\n",
378 __func__, dev->name);
382 /* One reference from device. We must do this before
383 * we invoke __ipv6_regen_rndid().
387 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
388 ndev->cnf.accept_dad = -1;
390 #if IS_ENABLED(CONFIG_IPV6_SIT)
391 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
392 pr_info("%s: Disabled Multicast RS\n", dev->name);
393 ndev->cnf.rtr_solicits = 0;
397 INIT_LIST_HEAD(&ndev->tempaddr_list);
398 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
399 if ((dev->flags&IFF_LOOPBACK) ||
400 dev->type == ARPHRD_TUNNEL ||
401 dev->type == ARPHRD_TUNNEL6 ||
402 dev->type == ARPHRD_SIT ||
403 dev->type == ARPHRD_NONE) {
404 ndev->cnf.use_tempaddr = -1;
407 ipv6_regen_rndid((unsigned long) ndev);
410 ndev->token = in6addr_any;
412 if (netif_running(dev) && addrconf_qdisc_ok(dev))
413 ndev->if_flags |= IF_READY;
415 ipv6_mc_init_dev(ndev);
416 ndev->tstamp = jiffies;
417 err = addrconf_sysctl_register(ndev);
419 ipv6_mc_destroy_dev(ndev);
420 del_timer(&ndev->regen_timer);
423 /* protected by rtnl_lock */
424 rcu_assign_pointer(dev->ip6_ptr, ndev);
426 /* Join interface-local all-node multicast group */
427 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
429 /* Join all-node multicast group */
430 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
432 /* Join all-router multicast group if forwarding is set */
433 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
434 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
439 neigh_parms_release(&nd_tbl, ndev->nd_parms);
441 in6_dev_finish_destroy(ndev);
445 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
447 struct inet6_dev *idev;
451 idev = __in6_dev_get(dev);
453 idev = ipv6_add_dev(dev);
458 if (dev->flags&IFF_UP)
463 static int inet6_netconf_msgsize_devconf(int type)
465 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
466 + nla_total_size(4); /* NETCONFA_IFINDEX */
468 /* type -1 is used for ALL */
469 if (type == -1 || type == NETCONFA_FORWARDING)
470 size += nla_total_size(4);
471 #ifdef CONFIG_IPV6_MROUTE
472 if (type == -1 || type == NETCONFA_MC_FORWARDING)
473 size += nla_total_size(4);
475 if (type == -1 || type == NETCONFA_PROXY_NEIGH)
476 size += nla_total_size(4);
478 if (type == -1 || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
479 size += nla_total_size(4);
484 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
485 struct ipv6_devconf *devconf, u32 portid,
486 u32 seq, int event, unsigned int flags,
489 struct nlmsghdr *nlh;
490 struct netconfmsg *ncm;
492 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
497 ncm = nlmsg_data(nlh);
498 ncm->ncm_family = AF_INET6;
500 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
501 goto nla_put_failure;
503 /* type -1 is used for ALL */
504 if ((type == -1 || type == NETCONFA_FORWARDING) &&
505 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
506 goto nla_put_failure;
507 #ifdef CONFIG_IPV6_MROUTE
508 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
509 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
510 devconf->mc_forwarding) < 0)
511 goto nla_put_failure;
513 if ((type == -1 || type == NETCONFA_PROXY_NEIGH) &&
514 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
515 goto nla_put_failure;
517 if ((type == -1 || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
518 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
519 devconf->ignore_routes_with_linkdown) < 0)
520 goto nla_put_failure;
526 nlmsg_cancel(skb, nlh);
530 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
531 struct ipv6_devconf *devconf)
536 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
540 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
541 RTM_NEWNETCONF, 0, type);
543 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
544 WARN_ON(err == -EMSGSIZE);
548 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
551 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
554 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
555 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
556 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
557 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
558 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
561 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
562 struct nlmsghdr *nlh)
564 struct net *net = sock_net(in_skb->sk);
565 struct nlattr *tb[NETCONFA_MAX+1];
566 struct netconfmsg *ncm;
568 struct ipv6_devconf *devconf;
569 struct inet6_dev *in6_dev;
570 struct net_device *dev;
574 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
575 devconf_ipv6_policy);
580 if (!tb[NETCONFA_IFINDEX])
583 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
585 case NETCONFA_IFINDEX_ALL:
586 devconf = net->ipv6.devconf_all;
588 case NETCONFA_IFINDEX_DEFAULT:
589 devconf = net->ipv6.devconf_dflt;
592 dev = __dev_get_by_index(net, ifindex);
595 in6_dev = __in6_dev_get(dev);
598 devconf = &in6_dev->cnf;
603 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
607 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
608 NETLINK_CB(in_skb).portid,
609 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
612 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
613 WARN_ON(err == -EMSGSIZE);
617 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
622 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
623 struct netlink_callback *cb)
625 struct net *net = sock_net(skb->sk);
628 struct net_device *dev;
629 struct inet6_dev *idev;
630 struct hlist_head *head;
633 s_idx = idx = cb->args[1];
635 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
637 head = &net->dev_index_head[h];
639 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
641 hlist_for_each_entry_rcu(dev, head, index_hlist) {
644 idev = __in6_dev_get(dev);
648 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
650 NETLINK_CB(cb->skb).portid,
658 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
664 if (h == NETDEV_HASHENTRIES) {
665 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
666 net->ipv6.devconf_all,
667 NETLINK_CB(cb->skb).portid,
669 RTM_NEWNETCONF, NLM_F_MULTI,
675 if (h == NETDEV_HASHENTRIES + 1) {
676 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
677 net->ipv6.devconf_dflt,
678 NETLINK_CB(cb->skb).portid,
680 RTM_NEWNETCONF, NLM_F_MULTI,
694 static void dev_forward_change(struct inet6_dev *idev)
696 struct net_device *dev;
697 struct inet6_ifaddr *ifa;
702 if (idev->cnf.forwarding)
703 dev_disable_lro(dev);
704 if (dev->flags & IFF_MULTICAST) {
705 if (idev->cnf.forwarding) {
706 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
707 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
708 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
710 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
711 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
712 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
716 list_for_each_entry(ifa, &idev->addr_list, if_list) {
717 if (ifa->flags&IFA_F_TENTATIVE)
719 if (idev->cnf.forwarding)
720 addrconf_join_anycast(ifa);
722 addrconf_leave_anycast(ifa);
724 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
725 dev->ifindex, &idev->cnf);
729 static void addrconf_forward_change(struct net *net, __s32 newf)
731 struct net_device *dev;
732 struct inet6_dev *idev;
734 for_each_netdev(net, dev) {
735 idev = __in6_dev_get(dev);
737 int changed = (!idev->cnf.forwarding) ^ (!newf);
738 idev->cnf.forwarding = newf;
740 dev_forward_change(idev);
745 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
751 return restart_syscall();
753 net = (struct net *)table->extra2;
757 if (p == &net->ipv6.devconf_dflt->forwarding) {
758 if ((!newf) ^ (!old))
759 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
760 NETCONFA_IFINDEX_DEFAULT,
761 net->ipv6.devconf_dflt);
766 if (p == &net->ipv6.devconf_all->forwarding) {
767 net->ipv6.devconf_dflt->forwarding = newf;
768 addrconf_forward_change(net, newf);
769 if ((!newf) ^ (!old))
770 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
771 NETCONFA_IFINDEX_ALL,
772 net->ipv6.devconf_all);
773 } else if ((!newf) ^ (!old))
774 dev_forward_change((struct inet6_dev *)table->extra1);
778 rt6_purge_dflt_routers(net);
782 static void addrconf_linkdown_change(struct net *net, __s32 newf)
784 struct net_device *dev;
785 struct inet6_dev *idev;
787 for_each_netdev(net, dev) {
788 idev = __in6_dev_get(dev);
790 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
792 idev->cnf.ignore_routes_with_linkdown = newf;
794 inet6_netconf_notify_devconf(dev_net(dev),
795 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
802 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
808 return restart_syscall();
810 net = (struct net *)table->extra2;
814 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
815 if ((!newf) ^ (!old))
816 inet6_netconf_notify_devconf(net,
817 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
818 NETCONFA_IFINDEX_DEFAULT,
819 net->ipv6.devconf_dflt);
824 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
825 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
826 addrconf_linkdown_change(net, newf);
827 if ((!newf) ^ (!old))
828 inet6_netconf_notify_devconf(net,
829 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
830 NETCONFA_IFINDEX_ALL,
831 net->ipv6.devconf_all);
840 /* Nobody refers to this ifaddr, destroy it */
841 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
843 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
845 #ifdef NET_REFCNT_DEBUG
846 pr_debug("%s\n", __func__);
849 in6_dev_put(ifp->idev);
851 if (cancel_delayed_work(&ifp->dad_work))
852 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
855 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
856 pr_warn("Freeing alive inet6 address %p\n", ifp);
865 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
868 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
871 * Each device address list is sorted in order of scope -
872 * global before linklocal.
874 list_for_each(p, &idev->addr_list) {
875 struct inet6_ifaddr *ifa
876 = list_entry(p, struct inet6_ifaddr, if_list);
877 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
881 list_add_tail(&ifp->if_list, p);
884 static u32 inet6_addr_hash(const struct in6_addr *addr)
886 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
889 /* On success it returns ifp with increased reference count */
891 static struct inet6_ifaddr *
892 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
893 const struct in6_addr *peer_addr, int pfxlen,
894 int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
896 struct inet6_ifaddr *ifa = NULL;
900 int addr_type = ipv6_addr_type(addr);
902 if (addr_type == IPV6_ADDR_ANY ||
903 addr_type & IPV6_ADDR_MULTICAST ||
904 (!(idev->dev->flags & IFF_LOOPBACK) &&
905 addr_type & IPV6_ADDR_LOOPBACK))
906 return ERR_PTR(-EADDRNOTAVAIL);
910 err = -ENODEV; /*XXX*/
914 if (idev->cnf.disable_ipv6) {
919 spin_lock(&addrconf_hash_lock);
921 /* Ignore adding duplicate addresses on an interface */
922 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
923 ADBG("ipv6_add_addr: already assigned\n");
928 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
931 ADBG("ipv6_add_addr: malloc failed\n");
936 rt = addrconf_dst_alloc(idev, addr, false);
942 neigh_parms_data_state_setall(idev->nd_parms);
946 ifa->peer_addr = *peer_addr;
948 spin_lock_init(&ifa->lock);
949 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
950 INIT_HLIST_NODE(&ifa->addr_lst);
952 ifa->prefix_len = pfxlen;
953 ifa->flags = flags | IFA_F_TENTATIVE;
954 ifa->valid_lft = valid_lft;
955 ifa->prefered_lft = prefered_lft;
956 ifa->cstamp = ifa->tstamp = jiffies;
957 ifa->tokenized = false;
966 /* Add to big hash table */
967 hash = inet6_addr_hash(addr);
969 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
970 spin_unlock(&addrconf_hash_lock);
972 write_lock(&idev->lock);
973 /* Add to inet6_dev unicast addr list. */
974 ipv6_link_dev_addr(idev, ifa);
976 if (ifa->flags&IFA_F_TEMPORARY) {
977 list_add(&ifa->tmp_list, &idev->tempaddr_list);
982 write_unlock(&idev->lock);
984 rcu_read_unlock_bh();
986 if (likely(err == 0))
987 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
995 spin_unlock(&addrconf_hash_lock);
999 enum cleanup_prefix_rt_t {
1000 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1001 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1002 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1006 * Check, whether the prefix for ifp would still need a prefix route
1007 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1010 * 1) we don't purge prefix if address was not permanent.
1011 * prefix is managed by its own lifetime.
1012 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1013 * 3) if there are no addresses, delete prefix.
1014 * 4) if there are still other permanent address(es),
1015 * corresponding prefix is still permanent.
1016 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1017 * don't purge the prefix, assume user space is managing it.
1018 * 6) otherwise, update prefix lifetime to the
1019 * longest valid lifetime among the corresponding
1020 * addresses on the device.
1021 * Note: subsequent RA will update lifetime.
1023 static enum cleanup_prefix_rt_t
1024 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1026 struct inet6_ifaddr *ifa;
1027 struct inet6_dev *idev = ifp->idev;
1028 unsigned long lifetime;
1029 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1033 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1036 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1039 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1040 return CLEANUP_PREFIX_RT_NOP;
1042 action = CLEANUP_PREFIX_RT_EXPIRE;
1044 spin_lock(&ifa->lock);
1046 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1048 * Note: Because this address is
1049 * not permanent, lifetime <
1050 * LONG_MAX / HZ here.
1052 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1053 *expires = ifa->tstamp + lifetime * HZ;
1054 spin_unlock(&ifa->lock);
1061 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
1063 struct rt6_info *rt;
1065 rt = addrconf_get_prefix_route(&ifp->addr,
1068 0, RTF_GATEWAY | RTF_DEFAULT);
1073 if (!(rt->rt6i_flags & RTF_EXPIRES))
1074 rt6_set_expires(rt, expires);
1081 /* This function wants to get referenced ifp and releases it before return */
1083 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1086 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1087 unsigned long expires;
1091 spin_lock_bh(&ifp->lock);
1093 ifp->state = INET6_IFADDR_STATE_DEAD;
1094 spin_unlock_bh(&ifp->lock);
1096 if (state == INET6_IFADDR_STATE_DEAD)
1099 spin_lock_bh(&addrconf_hash_lock);
1100 hlist_del_init_rcu(&ifp->addr_lst);
1101 spin_unlock_bh(&addrconf_hash_lock);
1103 write_lock_bh(&ifp->idev->lock);
1105 if (ifp->flags&IFA_F_TEMPORARY) {
1106 list_del(&ifp->tmp_list);
1108 in6_ifa_put(ifp->ifpub);
1114 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1115 action = check_cleanup_prefix_route(ifp, &expires);
1117 list_del_init(&ifp->if_list);
1120 write_unlock_bh(&ifp->idev->lock);
1122 addrconf_del_dad_work(ifp);
1124 ipv6_ifa_notify(RTM_DELADDR, ifp);
1126 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1128 if (action != CLEANUP_PREFIX_RT_NOP) {
1129 cleanup_prefix_route(ifp, expires,
1130 action == CLEANUP_PREFIX_RT_DEL);
1133 /* clean up prefsrc entries */
1134 rt6_remove_prefsrc(ifp);
1139 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1141 struct inet6_dev *idev = ifp->idev;
1142 struct in6_addr addr, *tmpaddr;
1143 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1144 unsigned long regen_advance;
1148 unsigned long now = jiffies;
1150 write_lock_bh(&idev->lock);
1152 spin_lock_bh(&ift->lock);
1153 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1154 spin_unlock_bh(&ift->lock);
1161 if (idev->cnf.use_tempaddr <= 0) {
1162 write_unlock_bh(&idev->lock);
1163 pr_info("%s: use_tempaddr is disabled\n", __func__);
1168 spin_lock_bh(&ifp->lock);
1169 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1170 idev->cnf.use_tempaddr = -1; /*XXX*/
1171 spin_unlock_bh(&ifp->lock);
1172 write_unlock_bh(&idev->lock);
1173 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1180 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1181 __ipv6_try_regen_rndid(idev, tmpaddr);
1182 memcpy(&addr.s6_addr[8], idev->rndid, 8);
1183 age = (now - ifp->tstamp) / HZ;
1184 tmp_valid_lft = min_t(__u32,
1186 idev->cnf.temp_valid_lft + age);
1187 tmp_prefered_lft = min_t(__u32,
1189 idev->cnf.temp_prefered_lft + age -
1190 idev->cnf.max_desync_factor);
1191 tmp_plen = ifp->prefix_len;
1192 tmp_tstamp = ifp->tstamp;
1193 spin_unlock_bh(&ifp->lock);
1195 regen_advance = idev->cnf.regen_max_retry *
1196 idev->cnf.dad_transmits *
1197 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1198 write_unlock_bh(&idev->lock);
1200 /* A temporary address is created only if this calculated Preferred
1201 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1202 * an implementation must not create a temporary address with a zero
1203 * Preferred Lifetime.
1204 * Use age calculation as in addrconf_verify to avoid unnecessary
1205 * temporary addresses being generated.
1207 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1208 if (tmp_prefered_lft <= regen_advance + age) {
1215 addr_flags = IFA_F_TEMPORARY;
1216 /* set in addrconf_prefix_rcv() */
1217 if (ifp->flags & IFA_F_OPTIMISTIC)
1218 addr_flags |= IFA_F_OPTIMISTIC;
1220 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1221 ipv6_addr_scope(&addr), addr_flags,
1222 tmp_valid_lft, tmp_prefered_lft);
1226 pr_info("%s: retry temporary address regeneration\n", __func__);
1228 write_lock_bh(&idev->lock);
1232 spin_lock_bh(&ift->lock);
1235 ift->tstamp = tmp_tstamp;
1236 spin_unlock_bh(&ift->lock);
1238 addrconf_dad_start(ift);
1246 * Choose an appropriate source address (RFC3484)
1249 IPV6_SADDR_RULE_INIT = 0,
1250 IPV6_SADDR_RULE_LOCAL,
1251 IPV6_SADDR_RULE_SCOPE,
1252 IPV6_SADDR_RULE_PREFERRED,
1253 #ifdef CONFIG_IPV6_MIP6
1254 IPV6_SADDR_RULE_HOA,
1256 IPV6_SADDR_RULE_OIF,
1257 IPV6_SADDR_RULE_LABEL,
1258 IPV6_SADDR_RULE_PRIVACY,
1259 IPV6_SADDR_RULE_ORCHID,
1260 IPV6_SADDR_RULE_PREFIX,
1261 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1262 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1267 struct ipv6_saddr_score {
1270 struct inet6_ifaddr *ifa;
1271 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1276 struct ipv6_saddr_dst {
1277 const struct in6_addr *addr;
1284 static inline int ipv6_saddr_preferred(int type)
1286 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1291 static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev)
1293 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1294 return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic;
1300 static int ipv6_get_saddr_eval(struct net *net,
1301 struct ipv6_saddr_score *score,
1302 struct ipv6_saddr_dst *dst,
1307 if (i <= score->rule) {
1309 case IPV6_SADDR_RULE_SCOPE:
1310 ret = score->scopedist;
1312 case IPV6_SADDR_RULE_PREFIX:
1313 ret = score->matchlen;
1316 ret = !!test_bit(i, score->scorebits);
1322 case IPV6_SADDR_RULE_INIT:
1323 /* Rule 0: remember if hiscore is not ready yet */
1326 case IPV6_SADDR_RULE_LOCAL:
1327 /* Rule 1: Prefer same address */
1328 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1330 case IPV6_SADDR_RULE_SCOPE:
1331 /* Rule 2: Prefer appropriate scope
1336 * ---+--+-+---> scope
1338 * | d is scope of the destination.
1340 * | \ <- smaller scope is better if
1341 * B-15 | \ if scope is enough for destination.
1342 * | ret = B - scope (-1 <= scope >= d <= 15).
1344 * |/ <- greater is better
1345 * -C / if scope is not enough for destination.
1346 * /| ret = scope - C (-1 <= d < scope <= 15).
1348 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1349 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1350 * Assume B = 0 and we get C > 29.
1352 ret = __ipv6_addr_src_scope(score->addr_type);
1353 if (ret >= dst->scope)
1356 ret -= 128; /* 30 is enough */
1357 score->scopedist = ret;
1359 case IPV6_SADDR_RULE_PREFERRED:
1361 /* Rule 3: Avoid deprecated and optimistic addresses */
1362 u8 avoid = IFA_F_DEPRECATED;
1364 if (!ipv6_use_optimistic_addr(score->ifa->idev))
1365 avoid |= IFA_F_OPTIMISTIC;
1366 ret = ipv6_saddr_preferred(score->addr_type) ||
1367 !(score->ifa->flags & avoid);
1370 #ifdef CONFIG_IPV6_MIP6
1371 case IPV6_SADDR_RULE_HOA:
1373 /* Rule 4: Prefer home address */
1374 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1375 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1379 case IPV6_SADDR_RULE_OIF:
1380 /* Rule 5: Prefer outgoing interface */
1381 ret = (!dst->ifindex ||
1382 dst->ifindex == score->ifa->idev->dev->ifindex);
1384 case IPV6_SADDR_RULE_LABEL:
1385 /* Rule 6: Prefer matching label */
1386 ret = ipv6_addr_label(net,
1387 &score->ifa->addr, score->addr_type,
1388 score->ifa->idev->dev->ifindex) == dst->label;
1390 case IPV6_SADDR_RULE_PRIVACY:
1392 /* Rule 7: Prefer public address
1393 * Note: prefer temporary address if use_tempaddr >= 2
1395 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1396 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1397 score->ifa->idev->cnf.use_tempaddr >= 2;
1398 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1401 case IPV6_SADDR_RULE_ORCHID:
1402 /* Rule 8-: Prefer ORCHID vs ORCHID or
1403 * non-ORCHID vs non-ORCHID
1405 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1406 ipv6_addr_orchid(dst->addr));
1408 case IPV6_SADDR_RULE_PREFIX:
1409 /* Rule 8: Use longest matching prefix */
1410 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1411 if (ret > score->ifa->prefix_len)
1412 ret = score->ifa->prefix_len;
1413 score->matchlen = ret;
1415 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1416 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1417 /* Optimistic addresses still have lower precedence than other
1418 * preferred addresses.
1420 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1428 __set_bit(i, score->scorebits);
1434 static int __ipv6_dev_get_saddr(struct net *net,
1435 struct ipv6_saddr_dst *dst,
1436 struct inet6_dev *idev,
1437 struct ipv6_saddr_score *scores,
1440 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1442 read_lock_bh(&idev->lock);
1443 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1447 * - Tentative Address (RFC2462 section 5.4)
1448 * - A tentative address is not considered
1449 * "assigned to an interface" in the traditional
1450 * sense, unless it is also flagged as optimistic.
1451 * - Candidate Source Address (section 4)
1452 * - In any case, anycast addresses, multicast
1453 * addresses, and the unspecified address MUST
1454 * NOT be included in a candidate set.
1456 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1457 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1460 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1462 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1463 score->addr_type & IPV6_ADDR_MULTICAST)) {
1464 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1470 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1472 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1473 int minihiscore, miniscore;
1475 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1476 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1478 if (minihiscore > miniscore) {
1479 if (i == IPV6_SADDR_RULE_SCOPE &&
1480 score->scopedist > 0) {
1483 * each remaining entry
1484 * has too small (not enough)
1485 * scope, because ifa entries
1486 * are sorted by their scope
1492 } else if (minihiscore < miniscore) {
1494 in6_ifa_put(hiscore->ifa);
1496 in6_ifa_hold(score->ifa);
1498 swap(hiscore, score);
1499 hiscore_idx = 1 - hiscore_idx;
1501 /* restore our iterator */
1502 score->ifa = hiscore->ifa;
1509 read_unlock_bh(&idev->lock);
1513 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1514 const struct in6_addr *daddr, unsigned int prefs,
1515 struct in6_addr *saddr)
1517 struct ipv6_saddr_score scores[2], *hiscore;
1518 struct ipv6_saddr_dst dst;
1519 struct inet6_dev *idev;
1520 struct net_device *dev;
1522 bool use_oif_addr = false;
1523 int hiscore_idx = 0;
1525 dst_type = __ipv6_addr_type(daddr);
1527 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1528 dst.scope = __ipv6_addr_src_scope(dst_type);
1529 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1532 scores[hiscore_idx].rule = -1;
1533 scores[hiscore_idx].ifa = NULL;
1537 /* Candidate Source Address (section 4)
1538 * - multicast and link-local destination address,
1539 * the set of candidate source address MUST only
1540 * include addresses assigned to interfaces
1541 * belonging to the same link as the outgoing
1543 * (- For site-local destination addresses, the
1544 * set of candidate source addresses MUST only
1545 * include addresses assigned to interfaces
1546 * belonging to the same site as the outgoing
1548 * - "It is RECOMMENDED that the candidate source addresses
1549 * be the set of unicast addresses assigned to the
1550 * interface that will be used to send to the destination
1551 * (the 'outgoing' interface)." (RFC 6724)
1554 idev = __in6_dev_get(dst_dev);
1555 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1556 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1557 (idev && idev->cnf.use_oif_addrs_only)) {
1558 use_oif_addr = true;
1564 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1566 for_each_netdev_rcu(net, dev) {
1567 idev = __in6_dev_get(dev);
1570 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1575 hiscore = &scores[hiscore_idx];
1577 return -EADDRNOTAVAIL;
1579 *saddr = hiscore->ifa->addr;
1580 in6_ifa_put(hiscore->ifa);
1583 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1585 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1588 struct inet6_ifaddr *ifp;
1589 int err = -EADDRNOTAVAIL;
1591 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1592 if (ifp->scope > IFA_LINK)
1594 if (ifp->scope == IFA_LINK &&
1595 !(ifp->flags & banned_flags)) {
1604 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1607 struct inet6_dev *idev;
1608 int err = -EADDRNOTAVAIL;
1611 idev = __in6_dev_get(dev);
1613 read_lock_bh(&idev->lock);
1614 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1615 read_unlock_bh(&idev->lock);
1621 static int ipv6_count_addresses(struct inet6_dev *idev)
1624 struct inet6_ifaddr *ifp;
1626 read_lock_bh(&idev->lock);
1627 list_for_each_entry(ifp, &idev->addr_list, if_list)
1629 read_unlock_bh(&idev->lock);
1633 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1634 const struct net_device *dev, int strict)
1636 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
1638 EXPORT_SYMBOL(ipv6_chk_addr);
1640 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1641 const struct net_device *dev, int strict,
1644 struct inet6_ifaddr *ifp;
1645 unsigned int hash = inet6_addr_hash(addr);
1649 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1650 if (!net_eq(dev_net(ifp->idev->dev), net))
1652 /* Decouple optimistic from tentative for evaluation here.
1653 * Ban optimistic addresses explicitly, when required.
1655 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1656 ? (ifp->flags&~IFA_F_TENTATIVE)
1658 if (ipv6_addr_equal(&ifp->addr, addr) &&
1659 !(ifp_flags&banned_flags) &&
1660 (!dev || ifp->idev->dev == dev ||
1661 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1662 rcu_read_unlock_bh();
1667 rcu_read_unlock_bh();
1670 EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1672 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1673 struct net_device *dev)
1675 unsigned int hash = inet6_addr_hash(addr);
1676 struct inet6_ifaddr *ifp;
1678 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1679 if (!net_eq(dev_net(ifp->idev->dev), net))
1681 if (ipv6_addr_equal(&ifp->addr, addr)) {
1682 if (!dev || ifp->idev->dev == dev)
1689 /* Compares an address/prefix_len with addresses on device @dev.
1690 * If one is found it returns true.
1692 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1693 const unsigned int prefix_len, struct net_device *dev)
1695 struct inet6_dev *idev;
1696 struct inet6_ifaddr *ifa;
1700 idev = __in6_dev_get(dev);
1702 read_lock_bh(&idev->lock);
1703 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1704 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1708 read_unlock_bh(&idev->lock);
1714 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1716 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1718 struct inet6_dev *idev;
1719 struct inet6_ifaddr *ifa;
1724 idev = __in6_dev_get(dev);
1726 read_lock_bh(&idev->lock);
1727 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1728 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1733 read_unlock_bh(&idev->lock);
1738 EXPORT_SYMBOL(ipv6_chk_prefix);
1740 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1741 struct net_device *dev, int strict)
1743 struct inet6_ifaddr *ifp, *result = NULL;
1744 unsigned int hash = inet6_addr_hash(addr);
1747 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1748 if (!net_eq(dev_net(ifp->idev->dev), net))
1750 if (ipv6_addr_equal(&ifp->addr, addr)) {
1751 if (!dev || ifp->idev->dev == dev ||
1752 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1759 rcu_read_unlock_bh();
1764 /* Gets referenced address, destroys ifaddr */
1766 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1768 if (ifp->flags&IFA_F_PERMANENT) {
1769 spin_lock_bh(&ifp->lock);
1770 addrconf_del_dad_work(ifp);
1771 ifp->flags |= IFA_F_TENTATIVE;
1773 ifp->flags |= IFA_F_DADFAILED;
1774 spin_unlock_bh(&ifp->lock);
1776 ipv6_ifa_notify(0, ifp);
1778 } else if (ifp->flags&IFA_F_TEMPORARY) {
1779 struct inet6_ifaddr *ifpub;
1780 spin_lock_bh(&ifp->lock);
1783 in6_ifa_hold(ifpub);
1784 spin_unlock_bh(&ifp->lock);
1785 ipv6_create_tempaddr(ifpub, ifp);
1788 spin_unlock_bh(&ifp->lock);
1796 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1800 spin_lock_bh(&ifp->lock);
1801 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1802 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1805 spin_unlock_bh(&ifp->lock);
1810 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1812 struct in6_addr addr;
1813 struct inet6_dev *idev = ifp->idev;
1814 struct net *net = dev_net(ifp->idev->dev);
1816 if (addrconf_dad_end(ifp)) {
1821 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1822 ifp->idev->dev->name, &ifp->addr);
1824 spin_lock_bh(&ifp->lock);
1826 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
1827 int scope = ifp->scope;
1828 u32 flags = ifp->flags;
1829 struct in6_addr new_addr;
1830 struct inet6_ifaddr *ifp2;
1831 u32 valid_lft, preferred_lft;
1832 int pfxlen = ifp->prefix_len;
1833 int retries = ifp->stable_privacy_retry + 1;
1835 if (retries > net->ipv6.sysctl.idgen_retries) {
1836 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
1837 ifp->idev->dev->name);
1841 new_addr = ifp->addr;
1842 if (ipv6_generate_stable_address(&new_addr, retries,
1846 valid_lft = ifp->valid_lft;
1847 preferred_lft = ifp->prefered_lft;
1849 spin_unlock_bh(&ifp->lock);
1851 if (idev->cnf.max_addresses &&
1852 ipv6_count_addresses(idev) >=
1853 idev->cnf.max_addresses)
1856 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
1857 ifp->idev->dev->name);
1859 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
1860 scope, flags, valid_lft,
1865 spin_lock_bh(&ifp2->lock);
1866 ifp2->stable_privacy_retry = retries;
1867 ifp2->state = INET6_IFADDR_STATE_PREDAD;
1868 spin_unlock_bh(&ifp2->lock);
1870 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
1873 spin_lock_bh(&ifp->lock);
1874 } else if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1875 addr.s6_addr32[0] = htonl(0xfe800000);
1876 addr.s6_addr32[1] = 0;
1878 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1879 ipv6_addr_equal(&ifp->addr, &addr)) {
1880 /* DAD failed for link-local based on MAC address */
1881 idev->cnf.disable_ipv6 = 1;
1883 pr_info("%s: IPv6 being disabled!\n",
1884 ifp->idev->dev->name);
1889 /* transition from _POSTDAD to _ERRDAD */
1890 ifp->state = INET6_IFADDR_STATE_ERRDAD;
1891 spin_unlock_bh(&ifp->lock);
1893 addrconf_mod_dad_work(ifp, 0);
1896 /* Join to solicited addr multicast group.
1897 * caller must hold RTNL */
1898 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1900 struct in6_addr maddr;
1902 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1905 addrconf_addr_solict_mult(addr, &maddr);
1906 ipv6_dev_mc_inc(dev, &maddr);
1909 /* caller must hold RTNL */
1910 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1912 struct in6_addr maddr;
1914 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1917 addrconf_addr_solict_mult(addr, &maddr);
1918 __ipv6_dev_mc_dec(idev, &maddr);
1921 /* caller must hold RTNL */
1922 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1924 struct in6_addr addr;
1926 if (ifp->prefix_len >= 127) /* RFC 6164 */
1928 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1929 if (ipv6_addr_any(&addr))
1931 __ipv6_dev_ac_inc(ifp->idev, &addr);
1934 /* caller must hold RTNL */
1935 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1937 struct in6_addr addr;
1939 if (ifp->prefix_len >= 127) /* RFC 6164 */
1941 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1942 if (ipv6_addr_any(&addr))
1944 __ipv6_dev_ac_dec(ifp->idev, &addr);
1947 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1949 if (dev->addr_len != IEEE802154_ADDR_LEN)
1951 memcpy(eui, dev->dev_addr, 8);
1956 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1958 union fwnet_hwaddr *ha;
1960 if (dev->addr_len != FWNET_ALEN)
1963 ha = (union fwnet_hwaddr *)dev->dev_addr;
1965 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1970 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1972 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1973 if (dev->addr_len != ARCNET_ALEN)
1976 eui[7] = *(u8 *)dev->dev_addr;
1980 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1982 if (dev->addr_len != INFINIBAND_ALEN)
1984 memcpy(eui, dev->dev_addr + 12, 8);
1989 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1993 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1994 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1995 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1996 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1997 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1998 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2002 memcpy(eui + 4, &addr, 4);
2006 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2008 if (dev->priv_flags & IFF_ISATAP)
2009 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2013 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2015 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2018 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2020 memcpy(eui, dev->perm_addr, 3);
2021 memcpy(eui + 5, dev->perm_addr + 3, 3);
2028 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2030 switch (dev->type) {
2033 return addrconf_ifid_eui48(eui, dev);
2035 return addrconf_ifid_arcnet(eui, dev);
2036 case ARPHRD_INFINIBAND:
2037 return addrconf_ifid_infiniband(eui, dev);
2039 return addrconf_ifid_sit(eui, dev);
2041 return addrconf_ifid_gre(eui, dev);
2042 case ARPHRD_6LOWPAN:
2043 case ARPHRD_IEEE802154:
2044 return addrconf_ifid_eui64(eui, dev);
2045 case ARPHRD_IEEE1394:
2046 return addrconf_ifid_ieee1394(eui, dev);
2047 case ARPHRD_TUNNEL6:
2048 return addrconf_ifid_ip6tnl(eui, dev);
2053 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2056 struct inet6_ifaddr *ifp;
2058 read_lock_bh(&idev->lock);
2059 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2060 if (ifp->scope > IFA_LINK)
2062 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2063 memcpy(eui, ifp->addr.s6_addr+8, 8);
2068 read_unlock_bh(&idev->lock);
2072 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
2073 static void __ipv6_regen_rndid(struct inet6_dev *idev)
2076 get_random_bytes(idev->rndid, sizeof(idev->rndid));
2077 idev->rndid[0] &= ~0x02;
2080 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2081 * check if generated address is not inappropriate
2083 * - Reserved subnet anycast (RFC 2526)
2084 * 11111101 11....11 1xxxxxxx
2085 * - ISATAP (RFC4214) 6.1
2086 * 00-00-5E-FE-xx-xx-xx-xx
2088 * - XXX: already assigned to an address on the device
2090 if (idev->rndid[0] == 0xfd &&
2091 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2092 (idev->rndid[7]&0x80))
2094 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2095 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2097 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2102 static void ipv6_regen_rndid(unsigned long data)
2104 struct inet6_dev *idev = (struct inet6_dev *) data;
2105 unsigned long expires;
2108 write_lock_bh(&idev->lock);
2113 __ipv6_regen_rndid(idev);
2116 idev->cnf.temp_prefered_lft * HZ -
2117 idev->cnf.regen_max_retry * idev->cnf.dad_transmits *
2118 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) -
2119 idev->cnf.max_desync_factor * HZ;
2120 if (time_before(expires, jiffies)) {
2121 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
2122 __func__, idev->dev->name);
2126 if (!mod_timer(&idev->regen_timer, expires))
2130 write_unlock_bh(&idev->lock);
2131 rcu_read_unlock_bh();
2135 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
2137 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
2138 __ipv6_regen_rndid(idev);
2146 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
2147 unsigned long expires, u32 flags)
2149 struct fib6_config cfg = {
2150 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
2151 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2152 .fc_ifindex = dev->ifindex,
2153 .fc_expires = expires,
2155 .fc_flags = RTF_UP | flags,
2156 .fc_nlinfo.nl_net = dev_net(dev),
2157 .fc_protocol = RTPROT_KERNEL,
2162 /* Prevent useless cloning on PtP SIT.
2163 This thing is done here expecting that the whole
2164 class of non-broadcast devices need not cloning.
2166 #if IS_ENABLED(CONFIG_IPV6_SIT)
2167 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2168 cfg.fc_flags |= RTF_NONEXTHOP;
2171 ip6_route_add(&cfg);
2175 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2177 const struct net_device *dev,
2178 u32 flags, u32 noflags)
2180 struct fib6_node *fn;
2181 struct rt6_info *rt = NULL;
2182 struct fib6_table *table;
2183 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
2185 table = fib6_get_table(dev_net(dev), tb_id);
2189 read_lock_bh(&table->tb6_lock);
2190 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2194 noflags |= RTF_CACHE;
2195 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2196 if (rt->dst.dev->ifindex != dev->ifindex)
2198 if ((rt->rt6i_flags & flags) != flags)
2200 if ((rt->rt6i_flags & noflags) != 0)
2206 read_unlock_bh(&table->tb6_lock);
2211 /* Create "default" multicast route to the interface */
2213 static void addrconf_add_mroute(struct net_device *dev)
2215 struct fib6_config cfg = {
2216 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2217 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2218 .fc_ifindex = dev->ifindex,
2221 .fc_nlinfo.nl_net = dev_net(dev),
2224 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2226 ip6_route_add(&cfg);
2229 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2231 struct inet6_dev *idev;
2235 idev = ipv6_find_idev(dev);
2237 return ERR_PTR(-ENOBUFS);
2239 if (idev->cnf.disable_ipv6)
2240 return ERR_PTR(-EACCES);
2242 /* Add default multicast route */
2243 if (!(dev->flags & IFF_LOOPBACK))
2244 addrconf_add_mroute(dev);
2249 static void manage_tempaddrs(struct inet6_dev *idev,
2250 struct inet6_ifaddr *ifp,
2251 __u32 valid_lft, __u32 prefered_lft,
2252 bool create, unsigned long now)
2255 struct inet6_ifaddr *ift;
2257 read_lock_bh(&idev->lock);
2258 /* update all temporary addresses in the list */
2259 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2260 int age, max_valid, max_prefered;
2262 if (ifp != ift->ifpub)
2265 /* RFC 4941 section 3.3:
2266 * If a received option will extend the lifetime of a public
2267 * address, the lifetimes of temporary addresses should
2268 * be extended, subject to the overall constraint that no
2269 * temporary addresses should ever remain "valid" or "preferred"
2270 * for a time longer than (TEMP_VALID_LIFETIME) or
2271 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2273 age = (now - ift->cstamp) / HZ;
2274 max_valid = idev->cnf.temp_valid_lft - age;
2278 max_prefered = idev->cnf.temp_prefered_lft -
2279 idev->cnf.max_desync_factor - age;
2280 if (max_prefered < 0)
2283 if (valid_lft > max_valid)
2284 valid_lft = max_valid;
2286 if (prefered_lft > max_prefered)
2287 prefered_lft = max_prefered;
2289 spin_lock(&ift->lock);
2291 ift->valid_lft = valid_lft;
2292 ift->prefered_lft = prefered_lft;
2294 if (prefered_lft > 0)
2295 ift->flags &= ~IFA_F_DEPRECATED;
2297 spin_unlock(&ift->lock);
2298 if (!(flags&IFA_F_TENTATIVE))
2299 ipv6_ifa_notify(0, ift);
2302 if ((create || list_empty(&idev->tempaddr_list)) &&
2303 idev->cnf.use_tempaddr > 0) {
2304 /* When a new public address is created as described
2305 * in [ADDRCONF], also create a new temporary address.
2306 * Also create a temporary address if it's enabled but
2307 * no temporary address currently exists.
2309 read_unlock_bh(&idev->lock);
2310 ipv6_create_tempaddr(ifp, NULL);
2312 read_unlock_bh(&idev->lock);
2316 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2318 struct prefix_info *pinfo;
2323 struct inet6_dev *in6_dev;
2324 struct net *net = dev_net(dev);
2326 pinfo = (struct prefix_info *) opt;
2328 if (len < sizeof(struct prefix_info)) {
2329 ADBG("addrconf: prefix option too short\n");
2334 * Validation checks ([ADDRCONF], page 19)
2337 addr_type = ipv6_addr_type(&pinfo->prefix);
2339 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2342 valid_lft = ntohl(pinfo->valid);
2343 prefered_lft = ntohl(pinfo->prefered);
2345 if (prefered_lft > valid_lft) {
2346 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2350 in6_dev = in6_dev_get(dev);
2353 net_dbg_ratelimited("addrconf: device %s not configured\n",
2359 * Two things going on here:
2360 * 1) Add routes for on-link prefixes
2361 * 2) Configure prefixes with the auto flag set
2364 if (pinfo->onlink) {
2365 struct rt6_info *rt;
2366 unsigned long rt_expires;
2368 /* Avoid arithmetic overflow. Really, we could
2369 * save rt_expires in seconds, likely valid_lft,
2370 * but it would require division in fib gc, that it
2374 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2376 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2378 if (addrconf_finite_timeout(rt_expires))
2381 rt = addrconf_get_prefix_route(&pinfo->prefix,
2384 RTF_ADDRCONF | RTF_PREFIX_RT,
2385 RTF_GATEWAY | RTF_DEFAULT);
2388 /* Autoconf prefix route */
2389 if (valid_lft == 0) {
2392 } else if (addrconf_finite_timeout(rt_expires)) {
2394 rt6_set_expires(rt, jiffies + rt_expires);
2396 rt6_clean_expires(rt);
2398 } else if (valid_lft) {
2399 clock_t expires = 0;
2400 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2401 if (addrconf_finite_timeout(rt_expires)) {
2403 flags |= RTF_EXPIRES;
2404 expires = jiffies_to_clock_t(rt_expires);
2406 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2407 dev, expires, flags);
2412 /* Try to figure out our local address for this prefix */
2414 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2415 struct inet6_ifaddr *ifp;
2416 struct in6_addr addr;
2417 int create = 0, update_lft = 0;
2418 bool tokenized = false;
2420 if (pinfo->prefix_len == 64) {
2421 memcpy(&addr, &pinfo->prefix, 8);
2423 if (!ipv6_addr_any(&in6_dev->token)) {
2424 read_lock_bh(&in6_dev->lock);
2425 memcpy(addr.s6_addr + 8,
2426 in6_dev->token.s6_addr + 8, 8);
2427 read_unlock_bh(&in6_dev->lock);
2429 } else if (in6_dev->addr_gen_mode ==
2430 IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
2431 !ipv6_generate_stable_address(&addr, 0,
2433 addr_flags |= IFA_F_STABLE_PRIVACY;
2435 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2436 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2437 in6_dev_put(in6_dev);
2442 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2444 in6_dev_put(in6_dev);
2449 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
2451 if (!ifp && valid_lft) {
2452 int max_addresses = in6_dev->cnf.max_addresses;
2454 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2455 if (in6_dev->cnf.optimistic_dad &&
2456 !net->ipv6.devconf_all->forwarding && sllao)
2457 addr_flags = IFA_F_OPTIMISTIC;
2460 /* Do not allow to create too much of autoconfigured
2461 * addresses; this would be too easy way to crash kernel.
2463 if (!max_addresses ||
2464 ipv6_count_addresses(in6_dev) < max_addresses)
2465 ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2467 addr_type&IPV6_ADDR_SCOPE_MASK,
2468 addr_flags, valid_lft,
2471 if (IS_ERR_OR_NULL(ifp)) {
2472 in6_dev_put(in6_dev);
2478 spin_lock_bh(&ifp->lock);
2479 ifp->flags |= IFA_F_MANAGETEMPADDR;
2480 ifp->cstamp = jiffies;
2481 ifp->tokenized = tokenized;
2482 spin_unlock_bh(&ifp->lock);
2483 addrconf_dad_start(ifp);
2491 /* update lifetime (RFC2462 5.5.3 e) */
2492 spin_lock_bh(&ifp->lock);
2494 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2495 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2498 if (!update_lft && !create && stored_lft) {
2499 const u32 minimum_lft = min_t(u32,
2500 stored_lft, MIN_VALID_LIFETIME);
2501 valid_lft = max(valid_lft, minimum_lft);
2503 /* RFC4862 Section 5.5.3e:
2504 * "Note that the preferred lifetime of the
2505 * corresponding address is always reset to
2506 * the Preferred Lifetime in the received
2507 * Prefix Information option, regardless of
2508 * whether the valid lifetime is also reset or
2511 * So we should always update prefered_lft here.
2517 ifp->valid_lft = valid_lft;
2518 ifp->prefered_lft = prefered_lft;
2521 ifp->flags &= ~IFA_F_DEPRECATED;
2522 spin_unlock_bh(&ifp->lock);
2524 if (!(flags&IFA_F_TENTATIVE))
2525 ipv6_ifa_notify(0, ifp);
2527 spin_unlock_bh(&ifp->lock);
2529 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2536 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2537 in6_dev_put(in6_dev);
2541 * Set destination address.
2542 * Special case for SIT interfaces where we create a new "virtual"
2545 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2547 struct in6_ifreq ireq;
2548 struct net_device *dev;
2554 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2557 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2563 #if IS_ENABLED(CONFIG_IPV6_SIT)
2564 if (dev->type == ARPHRD_SIT) {
2565 const struct net_device_ops *ops = dev->netdev_ops;
2567 struct ip_tunnel_parm p;
2569 err = -EADDRNOTAVAIL;
2570 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2573 memset(&p, 0, sizeof(p));
2574 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2578 p.iph.protocol = IPPROTO_IPV6;
2580 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2582 if (ops->ndo_do_ioctl) {
2583 mm_segment_t oldfs = get_fs();
2586 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2593 dev = __dev_get_by_name(net, p.name);
2596 err = dev_open(dev);
2606 static int ipv6_mc_config(struct sock *sk, bool join,
2607 const struct in6_addr *addr, int ifindex)
2615 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2617 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2624 * Manual configuration of address on an interface
2626 static int inet6_addr_add(struct net *net, int ifindex,
2627 const struct in6_addr *pfx,
2628 const struct in6_addr *peer_pfx,
2629 unsigned int plen, __u32 ifa_flags,
2630 __u32 prefered_lft, __u32 valid_lft)
2632 struct inet6_ifaddr *ifp;
2633 struct inet6_dev *idev;
2634 struct net_device *dev;
2635 unsigned long timeout;
2645 /* check the lifetime */
2646 if (!valid_lft || prefered_lft > valid_lft)
2649 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2652 dev = __dev_get_by_index(net, ifindex);
2656 idev = addrconf_add_dev(dev);
2658 return PTR_ERR(idev);
2660 if (ifa_flags & IFA_F_MCAUTOJOIN) {
2661 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2662 true, pfx, ifindex);
2668 scope = ipv6_addr_scope(pfx);
2670 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2671 if (addrconf_finite_timeout(timeout)) {
2672 expires = jiffies_to_clock_t(timeout * HZ);
2673 valid_lft = timeout;
2674 flags = RTF_EXPIRES;
2678 ifa_flags |= IFA_F_PERMANENT;
2681 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2682 if (addrconf_finite_timeout(timeout)) {
2684 ifa_flags |= IFA_F_DEPRECATED;
2685 prefered_lft = timeout;
2688 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2689 valid_lft, prefered_lft);
2692 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2693 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2698 * Note that section 3.1 of RFC 4429 indicates
2699 * that the Optimistic flag should not be set for
2700 * manually configured addresses
2702 addrconf_dad_start(ifp);
2703 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2704 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2707 addrconf_verify_rtnl();
2709 } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2710 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2711 false, pfx, ifindex);
2714 return PTR_ERR(ifp);
2717 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2718 const struct in6_addr *pfx, unsigned int plen)
2720 struct inet6_ifaddr *ifp;
2721 struct inet6_dev *idev;
2722 struct net_device *dev;
2727 dev = __dev_get_by_index(net, ifindex);
2731 idev = __in6_dev_get(dev);
2735 read_lock_bh(&idev->lock);
2736 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2737 if (ifp->prefix_len == plen &&
2738 ipv6_addr_equal(pfx, &ifp->addr)) {
2740 read_unlock_bh(&idev->lock);
2742 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2743 (ifa_flags & IFA_F_MANAGETEMPADDR))
2744 manage_tempaddrs(idev, ifp, 0, 0, false,
2747 addrconf_verify_rtnl();
2748 if (ipv6_addr_is_multicast(pfx)) {
2749 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2750 false, pfx, dev->ifindex);
2755 read_unlock_bh(&idev->lock);
2756 return -EADDRNOTAVAIL;
2760 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2762 struct in6_ifreq ireq;
2765 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2768 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2772 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2773 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2774 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2779 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2781 struct in6_ifreq ireq;
2784 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2787 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2791 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
2792 ireq.ifr6_prefixlen);
2797 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2798 int plen, int scope)
2800 struct inet6_ifaddr *ifp;
2802 ifp = ipv6_add_addr(idev, addr, NULL, plen,
2803 scope, IFA_F_PERMANENT,
2804 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2806 spin_lock_bh(&ifp->lock);
2807 ifp->flags &= ~IFA_F_TENTATIVE;
2808 spin_unlock_bh(&ifp->lock);
2809 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2814 #if IS_ENABLED(CONFIG_IPV6_SIT)
2815 static void sit_add_v4_addrs(struct inet6_dev *idev)
2817 struct in6_addr addr;
2818 struct net_device *dev;
2819 struct net *net = dev_net(idev->dev);
2825 memset(&addr, 0, sizeof(struct in6_addr));
2826 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2828 if (idev->dev->flags&IFF_POINTOPOINT) {
2829 addr.s6_addr32[0] = htonl(0xfe800000);
2833 scope = IPV6_ADDR_COMPATv4;
2835 pflags |= RTF_NONEXTHOP;
2838 if (addr.s6_addr32[3]) {
2839 add_addr(idev, &addr, plen, scope);
2840 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
2844 for_each_netdev(net, dev) {
2845 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2846 if (in_dev && (dev->flags & IFF_UP)) {
2847 struct in_ifaddr *ifa;
2851 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2853 addr.s6_addr32[3] = ifa->ifa_local;
2855 if (ifa->ifa_scope == RT_SCOPE_LINK)
2857 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2858 if (idev->dev->flags&IFF_POINTOPOINT)
2863 add_addr(idev, &addr, plen, flag);
2864 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2872 static void init_loopback(struct net_device *dev)
2874 struct inet6_dev *idev;
2875 struct net_device *sp_dev;
2876 struct inet6_ifaddr *sp_ifa;
2877 struct rt6_info *sp_rt;
2883 idev = ipv6_find_idev(dev);
2885 pr_debug("%s: add_dev failed\n", __func__);
2889 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2891 /* Add routes to other interface's IPv6 addresses */
2892 for_each_netdev(dev_net(dev), sp_dev) {
2893 if (!strcmp(sp_dev->name, dev->name))
2896 idev = __in6_dev_get(sp_dev);
2900 read_lock_bh(&idev->lock);
2901 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2903 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2907 /* This dst has been added to garbage list when
2908 * lo device down, release this obsolete dst and
2909 * reallocate a new router for ifa.
2911 if (sp_ifa->rt->dst.obsolete > 0) {
2912 ip6_rt_put(sp_ifa->rt);
2919 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
2921 /* Failure cases are ignored */
2922 if (!IS_ERR(sp_rt)) {
2927 read_unlock_bh(&idev->lock);
2931 static void addrconf_add_linklocal(struct inet6_dev *idev,
2932 const struct in6_addr *addr, u32 flags)
2934 struct inet6_ifaddr *ifp;
2935 u32 addr_flags = flags | IFA_F_PERMANENT;
2937 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2938 if (idev->cnf.optimistic_dad &&
2939 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2940 addr_flags |= IFA_F_OPTIMISTIC;
2943 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
2944 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2946 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2947 addrconf_dad_start(ifp);
2952 static bool ipv6_reserved_interfaceid(struct in6_addr address)
2954 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
2957 if (address.s6_addr32[2] == htonl(0x02005eff) &&
2958 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
2961 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
2962 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
2968 static int ipv6_generate_stable_address(struct in6_addr *address,
2970 const struct inet6_dev *idev)
2972 static DEFINE_SPINLOCK(lock);
2973 static __u32 digest[SHA_DIGEST_WORDS];
2974 static __u32 workspace[SHA_WORKSPACE_WORDS];
2977 char __data[SHA_MESSAGE_BYTES];
2979 struct in6_addr secret;
2981 unsigned char hwaddr[MAX_ADDR_LEN];
2986 struct in6_addr secret;
2987 struct in6_addr temp;
2988 struct net *net = dev_net(idev->dev);
2990 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
2992 if (idev->cnf.stable_secret.initialized)
2993 secret = idev->cnf.stable_secret.secret;
2994 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
2995 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3000 spin_lock_bh(&lock);
3003 memset(&data, 0, sizeof(data));
3004 memset(workspace, 0, sizeof(workspace));
3005 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3006 data.prefix[0] = address->s6_addr32[0];
3007 data.prefix[1] = address->s6_addr32[1];
3008 data.secret = secret;
3009 data.dad_count = dad_count;
3011 sha_transform(digest, data.__data, workspace);
3014 temp.s6_addr32[2] = (__force __be32)digest[0];
3015 temp.s6_addr32[3] = (__force __be32)digest[1];
3017 spin_unlock_bh(&lock);
3019 if (ipv6_reserved_interfaceid(temp)) {
3021 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3030 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3032 struct in6_addr addr;
3034 /* no link local addresses on L3 master devices */
3035 if (netif_is_l3_master(idev->dev))
3038 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3040 if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY) {
3041 if (!ipv6_generate_stable_address(&addr, 0, idev))
3042 addrconf_add_linklocal(idev, &addr,
3043 IFA_F_STABLE_PRIVACY);
3044 else if (prefix_route)
3045 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3046 } else if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) {
3047 /* addrconf_add_linklocal also adds a prefix_route and we
3048 * only need to care about prefix routes if ipv6_generate_eui64
3049 * couldn't generate one.
3051 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3052 addrconf_add_linklocal(idev, &addr, 0);
3053 else if (prefix_route)
3054 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3058 static void addrconf_dev_config(struct net_device *dev)
3060 struct inet6_dev *idev;
3064 if ((dev->type != ARPHRD_ETHER) &&
3065 (dev->type != ARPHRD_FDDI) &&
3066 (dev->type != ARPHRD_ARCNET) &&
3067 (dev->type != ARPHRD_INFINIBAND) &&
3068 (dev->type != ARPHRD_IEEE802154) &&
3069 (dev->type != ARPHRD_IEEE1394) &&
3070 (dev->type != ARPHRD_TUNNEL6) &&
3071 (dev->type != ARPHRD_6LOWPAN)) {
3072 /* Alas, we support only Ethernet autoconfiguration. */
3076 idev = addrconf_add_dev(dev);
3080 addrconf_addr_gen(idev, false);
3083 #if IS_ENABLED(CONFIG_IPV6_SIT)
3084 static void addrconf_sit_config(struct net_device *dev)
3086 struct inet6_dev *idev;
3091 * Configure the tunnel with one of our IPv4
3092 * addresses... we should configure all of
3093 * our v4 addrs in the tunnel
3096 idev = ipv6_find_idev(dev);
3098 pr_debug("%s: add_dev failed\n", __func__);
3102 if (dev->priv_flags & IFF_ISATAP) {
3103 addrconf_addr_gen(idev, false);
3107 sit_add_v4_addrs(idev);
3109 if (dev->flags&IFF_POINTOPOINT)
3110 addrconf_add_mroute(dev);
3114 #if IS_ENABLED(CONFIG_NET_IPGRE)
3115 static void addrconf_gre_config(struct net_device *dev)
3117 struct inet6_dev *idev;
3121 idev = ipv6_find_idev(dev);
3123 pr_debug("%s: add_dev failed\n", __func__);
3127 addrconf_addr_gen(idev, true);
3128 if (dev->flags & IFF_POINTOPOINT)
3129 addrconf_add_mroute(dev);
3133 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3136 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3137 struct inet6_dev *idev = __in6_dev_get(dev);
3138 int run_pending = 0;
3142 case NETDEV_REGISTER:
3143 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3144 idev = ipv6_add_dev(dev);
3146 return notifier_from_errno(PTR_ERR(idev));
3150 case NETDEV_CHANGEMTU:
3151 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3152 if (dev->mtu < IPV6_MIN_MTU) {
3153 addrconf_ifdown(dev, 1);
3158 rt6_mtu_change(dev, dev->mtu);
3159 idev->cnf.mtu6 = dev->mtu;
3163 /* allocate new idev */
3164 idev = ipv6_add_dev(dev);
3168 /* device is still not ready */
3169 if (!(idev->if_flags & IF_READY))
3178 if (dev->flags & IFF_SLAVE)
3181 if (idev && idev->cnf.disable_ipv6)
3184 if (event == NETDEV_UP) {
3185 if (!addrconf_qdisc_ok(dev)) {
3186 /* device is not ready yet. */
3187 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3192 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3193 idev = ipv6_add_dev(dev);
3195 if (!IS_ERR_OR_NULL(idev)) {
3196 idev->if_flags |= IF_READY;
3199 } else if (event == NETDEV_CHANGE) {
3200 if (!addrconf_qdisc_ok(dev)) {
3201 /* device is still not ready. */
3206 if (idev->if_flags & IF_READY)
3207 /* device is already configured. */
3209 idev->if_flags |= IF_READY;
3212 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3218 switch (dev->type) {
3219 #if IS_ENABLED(CONFIG_IPV6_SIT)
3221 addrconf_sit_config(dev);
3224 #if IS_ENABLED(CONFIG_NET_IPGRE)
3226 addrconf_gre_config(dev);
3229 case ARPHRD_LOOPBACK:
3234 addrconf_dev_config(dev);
3238 if (!IS_ERR_OR_NULL(idev)) {
3240 addrconf_dad_run(idev);
3243 * If the MTU changed during the interface down,
3244 * when the interface up, the changed MTU must be
3245 * reflected in the idev as well as routers.
3247 if (idev->cnf.mtu6 != dev->mtu &&
3248 dev->mtu >= IPV6_MIN_MTU) {
3249 rt6_mtu_change(dev, dev->mtu);
3250 idev->cnf.mtu6 = dev->mtu;
3252 idev->tstamp = jiffies;
3253 inet6_ifinfo_notify(RTM_NEWLINK, idev);
3256 * If the changed mtu during down is lower than
3257 * IPV6_MIN_MTU stop IPv6 on this interface.
3259 if (dev->mtu < IPV6_MIN_MTU)
3260 addrconf_ifdown(dev, 1);
3265 case NETDEV_UNREGISTER:
3267 * Remove all addresses from this interface.
3269 addrconf_ifdown(dev, event != NETDEV_DOWN);
3272 case NETDEV_CHANGENAME:
3274 snmp6_unregister_dev(idev);
3275 addrconf_sysctl_unregister(idev);
3276 err = addrconf_sysctl_register(idev);
3278 return notifier_from_errno(err);
3279 err = snmp6_register_dev(idev);
3281 addrconf_sysctl_unregister(idev);
3282 return notifier_from_errno(err);
3287 case NETDEV_PRE_TYPE_CHANGE:
3288 case NETDEV_POST_TYPE_CHANGE:
3289 addrconf_type_change(dev, event);
3297 * addrconf module should be notified of a device going up
3299 static struct notifier_block ipv6_dev_notf = {
3300 .notifier_call = addrconf_notify,
3303 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3305 struct inet6_dev *idev;
3308 idev = __in6_dev_get(dev);
3310 if (event == NETDEV_POST_TYPE_CHANGE)
3311 ipv6_mc_remap(idev);
3312 else if (event == NETDEV_PRE_TYPE_CHANGE)
3313 ipv6_mc_unmap(idev);
3316 static int addrconf_ifdown(struct net_device *dev, int how)
3318 struct net *net = dev_net(dev);
3319 struct inet6_dev *idev;
3320 struct inet6_ifaddr *ifa;
3325 rt6_ifdown(net, dev);
3326 neigh_ifdown(&nd_tbl, dev);
3328 idev = __in6_dev_get(dev);
3333 * Step 1: remove reference to ipv6 device from parent device.
3339 /* protected by rtnl_lock */
3340 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3342 /* Step 1.5: remove snmp6 entry */
3343 snmp6_unregister_dev(idev);
3347 /* Step 2: clear hash table */
3348 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3349 struct hlist_head *h = &inet6_addr_lst[i];
3351 spin_lock_bh(&addrconf_hash_lock);
3353 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3354 if (ifa->idev == idev) {
3355 hlist_del_init_rcu(&ifa->addr_lst);
3356 addrconf_del_dad_work(ifa);
3360 spin_unlock_bh(&addrconf_hash_lock);
3363 write_lock_bh(&idev->lock);
3365 addrconf_del_rs_timer(idev);
3367 /* Step 2: clear flags for stateless addrconf */
3369 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3371 if (how && del_timer(&idev->regen_timer))
3374 /* Step 3: clear tempaddr list */
3375 while (!list_empty(&idev->tempaddr_list)) {
3376 ifa = list_first_entry(&idev->tempaddr_list,
3377 struct inet6_ifaddr, tmp_list);
3378 list_del(&ifa->tmp_list);
3379 write_unlock_bh(&idev->lock);
3380 spin_lock_bh(&ifa->lock);
3383 in6_ifa_put(ifa->ifpub);
3386 spin_unlock_bh(&ifa->lock);
3388 write_lock_bh(&idev->lock);
3391 while (!list_empty(&idev->addr_list)) {
3392 ifa = list_first_entry(&idev->addr_list,
3393 struct inet6_ifaddr, if_list);
3394 addrconf_del_dad_work(ifa);
3396 list_del(&ifa->if_list);
3398 write_unlock_bh(&idev->lock);
3400 spin_lock_bh(&ifa->lock);
3402 ifa->state = INET6_IFADDR_STATE_DEAD;
3403 spin_unlock_bh(&ifa->lock);
3405 if (state != INET6_IFADDR_STATE_DEAD) {
3406 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3407 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3411 write_lock_bh(&idev->lock);
3414 write_unlock_bh(&idev->lock);
3416 /* Step 5: Discard anycast and multicast list */
3418 ipv6_ac_destroy_dev(idev);
3419 ipv6_mc_destroy_dev(idev);
3424 idev->tstamp = jiffies;
3426 /* Last: Shot the device (if unregistered) */
3428 addrconf_sysctl_unregister(idev);
3429 neigh_parms_release(&nd_tbl, idev->nd_parms);
3430 neigh_ifdown(&nd_tbl, dev);
3436 static void addrconf_rs_timer(unsigned long data)
3438 struct inet6_dev *idev = (struct inet6_dev *)data;
3439 struct net_device *dev = idev->dev;
3440 struct in6_addr lladdr;
3442 write_lock(&idev->lock);
3443 if (idev->dead || !(idev->if_flags & IF_READY))
3446 if (!ipv6_accept_ra(idev))
3449 /* Announcement received after solicitation was sent */
3450 if (idev->if_flags & IF_RA_RCVD)
3453 if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
3454 write_unlock(&idev->lock);
3455 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3456 ndisc_send_rs(dev, &lladdr,
3457 &in6addr_linklocal_allrouters);
3461 write_lock(&idev->lock);
3462 /* The wait after the last probe can be shorter */
3463 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3464 idev->cnf.rtr_solicits) ?
3465 idev->cnf.rtr_solicit_delay :
3466 idev->cnf.rtr_solicit_interval);
3469 * Note: we do not support deprecated "all on-link"
3470 * assumption any longer.
3472 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3476 write_unlock(&idev->lock);
3482 * Duplicate Address Detection
3484 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3486 unsigned long rand_num;
3487 struct inet6_dev *idev = ifp->idev;
3489 if (ifp->flags & IFA_F_OPTIMISTIC)
3492 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3494 ifp->dad_probes = idev->cnf.dad_transmits;
3495 addrconf_mod_dad_work(ifp, rand_num);
3498 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3500 struct inet6_dev *idev = ifp->idev;
3501 struct net_device *dev = idev->dev;
3503 addrconf_join_solict(dev, &ifp->addr);
3505 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3507 read_lock_bh(&idev->lock);
3508 spin_lock(&ifp->lock);
3509 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3512 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3513 idev->cnf.accept_dad < 1 ||
3514 !(ifp->flags&IFA_F_TENTATIVE) ||
3515 ifp->flags & IFA_F_NODAD) {
3516 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3517 spin_unlock(&ifp->lock);
3518 read_unlock_bh(&idev->lock);
3520 addrconf_dad_completed(ifp);
3524 if (!(idev->if_flags & IF_READY)) {
3525 spin_unlock(&ifp->lock);
3526 read_unlock_bh(&idev->lock);
3528 * If the device is not ready:
3529 * - keep it tentative if it is a permanent address.
3530 * - otherwise, kill it.
3533 addrconf_dad_stop(ifp, 0);
3538 * Optimistic nodes can start receiving
3541 if (ifp->flags & IFA_F_OPTIMISTIC) {
3542 ip6_ins_rt(ifp->rt);
3543 if (ipv6_use_optimistic_addr(idev)) {
3544 /* Because optimistic nodes can use this address,
3545 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3547 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3551 addrconf_dad_kick(ifp);
3553 spin_unlock(&ifp->lock);
3554 read_unlock_bh(&idev->lock);
3557 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3559 bool begin_dad = false;
3561 spin_lock_bh(&ifp->lock);
3562 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3563 ifp->state = INET6_IFADDR_STATE_PREDAD;
3566 spin_unlock_bh(&ifp->lock);
3569 addrconf_mod_dad_work(ifp, 0);
3572 static void addrconf_dad_work(struct work_struct *w)
3574 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3575 struct inet6_ifaddr,
3577 struct inet6_dev *idev = ifp->idev;
3578 struct in6_addr mcaddr;
3584 } action = DAD_PROCESS;
3588 spin_lock_bh(&ifp->lock);
3589 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3591 ifp->state = INET6_IFADDR_STATE_DAD;
3592 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3594 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3596 spin_unlock_bh(&ifp->lock);
3598 if (action == DAD_BEGIN) {
3599 addrconf_dad_begin(ifp);
3601 } else if (action == DAD_ABORT) {
3602 addrconf_dad_stop(ifp, 1);
3606 if (!ifp->dad_probes && addrconf_dad_end(ifp))
3609 write_lock_bh(&idev->lock);
3610 if (idev->dead || !(idev->if_flags & IF_READY)) {
3611 write_unlock_bh(&idev->lock);
3615 spin_lock(&ifp->lock);
3616 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3617 spin_unlock(&ifp->lock);
3618 write_unlock_bh(&idev->lock);
3622 if (ifp->dad_probes == 0) {
3624 * DAD was successful
3627 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3628 spin_unlock(&ifp->lock);
3629 write_unlock_bh(&idev->lock);
3631 addrconf_dad_completed(ifp);
3637 addrconf_mod_dad_work(ifp,
3638 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
3639 spin_unlock(&ifp->lock);
3640 write_unlock_bh(&idev->lock);
3642 /* send a neighbour solicitation for our addr */
3643 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3644 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any, NULL);
3650 /* ifp->idev must be at least read locked */
3651 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3653 struct inet6_ifaddr *ifpiter;
3654 struct inet6_dev *idev = ifp->idev;
3656 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3657 if (ifpiter->scope > IFA_LINK)
3659 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3660 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3661 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3668 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3670 struct net_device *dev = ifp->idev->dev;
3671 struct in6_addr lladdr;
3672 bool send_rs, send_mld;
3674 addrconf_del_dad_work(ifp);
3677 * Configure the address for reception. Now it is valid.
3680 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3682 /* If added prefix is link local and we are prepared to process
3683 router advertisements, start sending router solicitations.
3686 read_lock_bh(&ifp->idev->lock);
3687 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
3688 send_rs = send_mld &&
3689 ipv6_accept_ra(ifp->idev) &&
3690 ifp->idev->cnf.rtr_solicits > 0 &&
3691 (dev->flags&IFF_LOOPBACK) == 0;
3692 read_unlock_bh(&ifp->idev->lock);
3694 /* While dad is in progress mld report's source address is in6_addrany.
3695 * Resend with proper ll now.
3698 ipv6_mc_dad_complete(ifp->idev);
3702 * If a host as already performed a random delay
3703 * [...] as part of DAD [...] there is no need
3704 * to delay again before sending the first RS
3706 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3708 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
3710 write_lock_bh(&ifp->idev->lock);
3711 spin_lock(&ifp->lock);
3712 ifp->idev->rs_probes = 1;
3713 ifp->idev->if_flags |= IF_RS_SENT;
3714 addrconf_mod_rs_timer(ifp->idev,
3715 ifp->idev->cnf.rtr_solicit_interval);
3716 spin_unlock(&ifp->lock);
3717 write_unlock_bh(&ifp->idev->lock);
3721 static void addrconf_dad_run(struct inet6_dev *idev)
3723 struct inet6_ifaddr *ifp;
3725 read_lock_bh(&idev->lock);
3726 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3727 spin_lock(&ifp->lock);
3728 if (ifp->flags & IFA_F_TENTATIVE &&
3729 ifp->state == INET6_IFADDR_STATE_DAD)
3730 addrconf_dad_kick(ifp);
3731 spin_unlock(&ifp->lock);
3733 read_unlock_bh(&idev->lock);
3736 #ifdef CONFIG_PROC_FS
3737 struct if6_iter_state {
3738 struct seq_net_private p;
3743 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3745 struct inet6_ifaddr *ifa = NULL;
3746 struct if6_iter_state *state = seq->private;
3747 struct net *net = seq_file_net(seq);
3750 /* initial bucket if pos is 0 */
3756 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3757 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
3759 if (!net_eq(dev_net(ifa->idev->dev), net))
3761 /* sync with offset */
3762 if (p < state->offset) {
3770 /* prepare for next bucket */
3777 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3778 struct inet6_ifaddr *ifa)
3780 struct if6_iter_state *state = seq->private;
3781 struct net *net = seq_file_net(seq);
3783 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
3784 if (!net_eq(dev_net(ifa->idev->dev), net))
3790 while (++state->bucket < IN6_ADDR_HSIZE) {
3792 hlist_for_each_entry_rcu_bh(ifa,
3793 &inet6_addr_lst[state->bucket], addr_lst) {
3794 if (!net_eq(dev_net(ifa->idev->dev), net))
3804 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3808 return if6_get_first(seq, *pos);
3811 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3813 struct inet6_ifaddr *ifa;
3815 ifa = if6_get_next(seq, v);
3820 static void if6_seq_stop(struct seq_file *seq, void *v)
3823 rcu_read_unlock_bh();
3826 static int if6_seq_show(struct seq_file *seq, void *v)
3828 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3829 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3831 ifp->idev->dev->ifindex,
3835 ifp->idev->dev->name);
3839 static const struct seq_operations if6_seq_ops = {
3840 .start = if6_seq_start,
3841 .next = if6_seq_next,
3842 .show = if6_seq_show,
3843 .stop = if6_seq_stop,
3846 static int if6_seq_open(struct inode *inode, struct file *file)
3848 return seq_open_net(inode, file, &if6_seq_ops,
3849 sizeof(struct if6_iter_state));
3852 static const struct file_operations if6_fops = {
3853 .owner = THIS_MODULE,
3854 .open = if6_seq_open,
3856 .llseek = seq_lseek,
3857 .release = seq_release_net,
3860 static int __net_init if6_proc_net_init(struct net *net)
3862 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
3867 static void __net_exit if6_proc_net_exit(struct net *net)
3869 remove_proc_entry("if_inet6", net->proc_net);
3872 static struct pernet_operations if6_proc_net_ops = {
3873 .init = if6_proc_net_init,
3874 .exit = if6_proc_net_exit,
3877 int __init if6_proc_init(void)
3879 return register_pernet_subsys(&if6_proc_net_ops);
3882 void if6_proc_exit(void)
3884 unregister_pernet_subsys(&if6_proc_net_ops);
3886 #endif /* CONFIG_PROC_FS */
3888 #if IS_ENABLED(CONFIG_IPV6_MIP6)
3889 /* Check if address is a home address configured on any interface. */
3890 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3893 struct inet6_ifaddr *ifp = NULL;
3894 unsigned int hash = inet6_addr_hash(addr);
3897 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
3898 if (!net_eq(dev_net(ifp->idev->dev), net))
3900 if (ipv6_addr_equal(&ifp->addr, addr) &&
3901 (ifp->flags & IFA_F_HOMEADDRESS)) {
3906 rcu_read_unlock_bh();
3912 * Periodic address status verification
3915 static void addrconf_verify_rtnl(void)
3917 unsigned long now, next, next_sec, next_sched;
3918 struct inet6_ifaddr *ifp;
3925 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3927 cancel_delayed_work(&addr_chk_work);
3929 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3931 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
3934 /* When setting preferred_lft to a value not zero or
3935 * infinity, while valid_lft is infinity
3936 * IFA_F_PERMANENT has a non-infinity life time.
3938 if ((ifp->flags & IFA_F_PERMANENT) &&
3939 (ifp->prefered_lft == INFINITY_LIFE_TIME))
3942 spin_lock(&ifp->lock);
3943 /* We try to batch several events at once. */
3944 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3946 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3947 age >= ifp->valid_lft) {
3948 spin_unlock(&ifp->lock);
3952 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3953 spin_unlock(&ifp->lock);
3955 } else if (age >= ifp->prefered_lft) {
3956 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3959 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3961 ifp->flags |= IFA_F_DEPRECATED;
3964 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
3965 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
3966 next = ifp->tstamp + ifp->valid_lft * HZ;
3968 spin_unlock(&ifp->lock);
3973 ipv6_ifa_notify(0, ifp);
3977 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3978 !(ifp->flags&IFA_F_TENTATIVE)) {
3979 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3980 ifp->idev->cnf.dad_transmits *
3981 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
3983 if (age >= ifp->prefered_lft - regen_advance) {
3984 struct inet6_ifaddr *ifpub = ifp->ifpub;
3985 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3986 next = ifp->tstamp + ifp->prefered_lft * HZ;
3987 if (!ifp->regen_count && ifpub) {
3990 in6_ifa_hold(ifpub);
3991 spin_unlock(&ifp->lock);
3993 spin_lock(&ifpub->lock);
3994 ifpub->regen_count = 0;
3995 spin_unlock(&ifpub->lock);
3996 ipv6_create_tempaddr(ifpub, ifp);
4001 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4002 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4003 spin_unlock(&ifp->lock);
4005 /* ifp->prefered_lft <= ifp->valid_lft */
4006 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4007 next = ifp->tstamp + ifp->prefered_lft * HZ;
4008 spin_unlock(&ifp->lock);
4013 next_sec = round_jiffies_up(next);
4016 /* If rounded timeout is accurate enough, accept it. */
4017 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4018 next_sched = next_sec;
4020 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4021 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4022 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4024 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4025 now, next, next_sec, next_sched);
4026 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
4027 rcu_read_unlock_bh();
4030 static void addrconf_verify_work(struct work_struct *w)
4033 addrconf_verify_rtnl();
4037 static void addrconf_verify(void)
4039 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4042 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4043 struct in6_addr **peer_pfx)
4045 struct in6_addr *pfx = NULL;
4050 pfx = nla_data(addr);
4053 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4055 pfx = nla_data(local);
4061 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4062 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4063 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4064 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
4065 [IFA_FLAGS] = { .len = sizeof(u32) },
4069 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
4071 struct net *net = sock_net(skb->sk);
4072 struct ifaddrmsg *ifm;
4073 struct nlattr *tb[IFA_MAX+1];
4074 struct in6_addr *pfx, *peer_pfx;
4078 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4082 ifm = nlmsg_data(nlh);
4083 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4087 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4089 /* We ignore other flags so far. */
4090 ifa_flags &= IFA_F_MANAGETEMPADDR;
4092 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4093 ifm->ifa_prefixlen);
4096 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
4097 u32 prefered_lft, u32 valid_lft)
4101 unsigned long timeout;
4102 bool was_managetempaddr;
4103 bool had_prefixroute;
4107 if (!valid_lft || (prefered_lft > valid_lft))
4110 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4111 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4114 timeout = addrconf_timeout_fixup(valid_lft, HZ);
4115 if (addrconf_finite_timeout(timeout)) {
4116 expires = jiffies_to_clock_t(timeout * HZ);
4117 valid_lft = timeout;
4118 flags = RTF_EXPIRES;
4122 ifa_flags |= IFA_F_PERMANENT;
4125 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4126 if (addrconf_finite_timeout(timeout)) {
4128 ifa_flags |= IFA_F_DEPRECATED;
4129 prefered_lft = timeout;
4132 spin_lock_bh(&ifp->lock);
4133 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4134 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4135 !(ifp->flags & IFA_F_NOPREFIXROUTE);
4136 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4137 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4138 IFA_F_NOPREFIXROUTE);
4139 ifp->flags |= ifa_flags;
4140 ifp->tstamp = jiffies;
4141 ifp->valid_lft = valid_lft;
4142 ifp->prefered_lft = prefered_lft;
4144 spin_unlock_bh(&ifp->lock);
4145 if (!(ifp->flags&IFA_F_TENTATIVE))
4146 ipv6_ifa_notify(0, ifp);
4148 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4149 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4151 } else if (had_prefixroute) {
4152 enum cleanup_prefix_rt_t action;
4153 unsigned long rt_expires;
4155 write_lock_bh(&ifp->idev->lock);
4156 action = check_cleanup_prefix_route(ifp, &rt_expires);
4157 write_unlock_bh(&ifp->idev->lock);
4159 if (action != CLEANUP_PREFIX_RT_NOP) {
4160 cleanup_prefix_route(ifp, rt_expires,
4161 action == CLEANUP_PREFIX_RT_DEL);
4165 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4166 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4167 valid_lft = prefered_lft = 0;
4168 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4169 !was_managetempaddr, jiffies);
4172 addrconf_verify_rtnl();
4178 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
4180 struct net *net = sock_net(skb->sk);
4181 struct ifaddrmsg *ifm;
4182 struct nlattr *tb[IFA_MAX+1];
4183 struct in6_addr *pfx, *peer_pfx;
4184 struct inet6_ifaddr *ifa;
4185 struct net_device *dev;
4186 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
4190 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4194 ifm = nlmsg_data(nlh);
4195 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4199 if (tb[IFA_CACHEINFO]) {
4200 struct ifa_cacheinfo *ci;
4202 ci = nla_data(tb[IFA_CACHEINFO]);
4203 valid_lft = ci->ifa_valid;
4204 preferred_lft = ci->ifa_prefered;
4206 preferred_lft = INFINITY_LIFE_TIME;
4207 valid_lft = INFINITY_LIFE_TIME;
4210 dev = __dev_get_by_index(net, ifm->ifa_index);
4214 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4216 /* We ignore other flags so far. */
4217 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4218 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
4220 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
4223 * It would be best to check for !NLM_F_CREATE here but
4224 * userspace already relies on not having to provide this.
4226 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
4227 ifm->ifa_prefixlen, ifa_flags,
4228 preferred_lft, valid_lft);
4231 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4232 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4235 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
4242 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4243 u8 scope, int ifindex)
4245 struct ifaddrmsg *ifm;
4247 ifm = nlmsg_data(nlh);
4248 ifm->ifa_family = AF_INET6;
4249 ifm->ifa_prefixlen = prefixlen;
4250 ifm->ifa_flags = flags;
4251 ifm->ifa_scope = scope;
4252 ifm->ifa_index = ifindex;
4255 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4256 unsigned long tstamp, u32 preferred, u32 valid)
4258 struct ifa_cacheinfo ci;
4260 ci.cstamp = cstamp_delta(cstamp);
4261 ci.tstamp = cstamp_delta(tstamp);
4262 ci.ifa_prefered = preferred;
4263 ci.ifa_valid = valid;
4265 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4268 static inline int rt_scope(int ifa_scope)
4270 if (ifa_scope & IFA_HOST)
4271 return RT_SCOPE_HOST;
4272 else if (ifa_scope & IFA_LINK)
4273 return RT_SCOPE_LINK;
4274 else if (ifa_scope & IFA_SITE)
4275 return RT_SCOPE_SITE;
4277 return RT_SCOPE_UNIVERSE;
4280 static inline int inet6_ifaddr_msgsize(void)
4282 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4283 + nla_total_size(16) /* IFA_LOCAL */
4284 + nla_total_size(16) /* IFA_ADDRESS */
4285 + nla_total_size(sizeof(struct ifa_cacheinfo))
4286 + nla_total_size(4) /* IFA_FLAGS */;
4289 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
4290 u32 portid, u32 seq, int event, unsigned int flags)
4292 struct nlmsghdr *nlh;
4293 u32 preferred, valid;
4295 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4299 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4300 ifa->idev->dev->ifindex);
4302 if (!((ifa->flags&IFA_F_PERMANENT) &&
4303 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
4304 preferred = ifa->prefered_lft;
4305 valid = ifa->valid_lft;
4306 if (preferred != INFINITY_LIFE_TIME) {
4307 long tval = (jiffies - ifa->tstamp)/HZ;
4308 if (preferred > tval)
4312 if (valid != INFINITY_LIFE_TIME) {
4320 preferred = INFINITY_LIFE_TIME;
4321 valid = INFINITY_LIFE_TIME;
4324 if (!ipv6_addr_any(&ifa->peer_addr)) {
4325 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4326 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
4329 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
4332 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4335 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4338 nlmsg_end(skb, nlh);
4342 nlmsg_cancel(skb, nlh);
4346 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
4347 u32 portid, u32 seq, int event, u16 flags)
4349 struct nlmsghdr *nlh;
4350 u8 scope = RT_SCOPE_UNIVERSE;
4351 int ifindex = ifmca->idev->dev->ifindex;
4353 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4354 scope = RT_SCOPE_SITE;
4356 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4360 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4361 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
4362 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
4363 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4364 nlmsg_cancel(skb, nlh);
4368 nlmsg_end(skb, nlh);
4372 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
4373 u32 portid, u32 seq, int event, unsigned int flags)
4375 struct nlmsghdr *nlh;
4376 u8 scope = RT_SCOPE_UNIVERSE;
4377 int ifindex = ifaca->aca_idev->dev->ifindex;
4379 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4380 scope = RT_SCOPE_SITE;
4382 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4386 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4387 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
4388 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
4389 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4390 nlmsg_cancel(skb, nlh);
4394 nlmsg_end(skb, nlh);
4404 /* called with rcu_read_lock() */
4405 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4406 struct netlink_callback *cb, enum addr_type_t type,
4407 int s_ip_idx, int *p_ip_idx)
4409 struct ifmcaddr6 *ifmca;
4410 struct ifacaddr6 *ifaca;
4412 int ip_idx = *p_ip_idx;
4414 read_lock_bh(&idev->lock);
4416 case UNICAST_ADDR: {
4417 struct inet6_ifaddr *ifa;
4419 /* unicast address incl. temp addr */
4420 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4421 if (++ip_idx < s_ip_idx)
4423 err = inet6_fill_ifaddr(skb, ifa,
4424 NETLINK_CB(cb->skb).portid,
4430 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4434 case MULTICAST_ADDR:
4435 /* multicast address */
4436 for (ifmca = idev->mc_list; ifmca;
4437 ifmca = ifmca->next, ip_idx++) {
4438 if (ip_idx < s_ip_idx)
4440 err = inet6_fill_ifmcaddr(skb, ifmca,
4441 NETLINK_CB(cb->skb).portid,
4450 /* anycast address */
4451 for (ifaca = idev->ac_list; ifaca;
4452 ifaca = ifaca->aca_next, ip_idx++) {
4453 if (ip_idx < s_ip_idx)
4455 err = inet6_fill_ifacaddr(skb, ifaca,
4456 NETLINK_CB(cb->skb).portid,
4467 read_unlock_bh(&idev->lock);
4472 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4473 enum addr_type_t type)
4475 struct net *net = sock_net(skb->sk);
4478 int s_idx, s_ip_idx;
4479 struct net_device *dev;
4480 struct inet6_dev *idev;
4481 struct hlist_head *head;
4484 s_idx = idx = cb->args[1];
4485 s_ip_idx = ip_idx = cb->args[2];
4488 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4489 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4491 head = &net->dev_index_head[h];
4492 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4495 if (h > s_h || idx > s_idx)
4498 idev = __in6_dev_get(dev);
4502 if (in6_dump_addrs(idev, skb, cb, type,
4503 s_ip_idx, &ip_idx) < 0)
4513 cb->args[2] = ip_idx;
4518 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4520 enum addr_type_t type = UNICAST_ADDR;
4522 return inet6_dump_addr(skb, cb, type);
4525 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4527 enum addr_type_t type = MULTICAST_ADDR;
4529 return inet6_dump_addr(skb, cb, type);
4533 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4535 enum addr_type_t type = ANYCAST_ADDR;
4537 return inet6_dump_addr(skb, cb, type);
4540 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
4542 struct net *net = sock_net(in_skb->sk);
4543 struct ifaddrmsg *ifm;
4544 struct nlattr *tb[IFA_MAX+1];
4545 struct in6_addr *addr = NULL, *peer;
4546 struct net_device *dev = NULL;
4547 struct inet6_ifaddr *ifa;
4548 struct sk_buff *skb;
4551 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4555 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4561 ifm = nlmsg_data(nlh);
4563 dev = __dev_get_by_index(net, ifm->ifa_index);
4565 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4567 err = -EADDRNOTAVAIL;
4571 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4577 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4578 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4580 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4581 WARN_ON(err == -EMSGSIZE);
4585 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4592 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4594 struct sk_buff *skb;
4595 struct net *net = dev_net(ifa->idev->dev);
4598 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4602 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4604 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4605 WARN_ON(err == -EMSGSIZE);
4609 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4613 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4616 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4617 __s32 *array, int bytes)
4619 BUG_ON(bytes < (DEVCONF_MAX * 4));
4621 memset(array, 0, bytes);
4622 array[DEVCONF_FORWARDING] = cnf->forwarding;
4623 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4624 array[DEVCONF_MTU6] = cnf->mtu6;
4625 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4626 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4627 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4628 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4629 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4630 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4631 jiffies_to_msecs(cnf->rtr_solicit_interval);
4632 array[DEVCONF_RTR_SOLICIT_DELAY] =
4633 jiffies_to_msecs(cnf->rtr_solicit_delay);
4634 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4635 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4636 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4637 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4638 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
4639 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4640 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4641 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4642 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4643 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4644 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4645 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4646 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
4647 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4648 #ifdef CONFIG_IPV6_ROUTER_PREF
4649 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4650 array[DEVCONF_RTR_PROBE_INTERVAL] =
4651 jiffies_to_msecs(cnf->rtr_probe_interval);
4652 #ifdef CONFIG_IPV6_ROUTE_INFO
4653 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4656 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4657 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4658 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4659 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4660 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
4662 #ifdef CONFIG_IPV6_MROUTE
4663 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4665 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4666 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4667 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4668 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4669 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
4670 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
4671 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
4672 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
4673 /* we omit DEVCONF_STABLE_SECRET for now */
4674 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
4677 static inline size_t inet6_ifla6_size(void)
4679 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4680 + nla_total_size(sizeof(struct ifla_cacheinfo))
4681 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4682 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4683 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4684 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
4687 static inline size_t inet6_if_nlmsg_size(void)
4689 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4690 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4691 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4692 + nla_total_size(4) /* IFLA_MTU */
4693 + nla_total_size(4) /* IFLA_LINK */
4694 + nla_total_size(1) /* IFLA_OPERSTATE */
4695 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4698 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4699 int items, int bytes)
4702 int pad = bytes - sizeof(u64) * items;
4705 /* Use put_unaligned() because stats may not be aligned for u64. */
4706 put_unaligned(items, &stats[0]);
4707 for (i = 1; i < items; i++)
4708 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4710 memset(&stats[items], 0, pad);
4713 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
4714 int bytes, size_t syncpoff)
4717 u64 buff[IPSTATS_MIB_MAX];
4718 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
4722 memset(buff, 0, sizeof(buff));
4723 buff[0] = IPSTATS_MIB_MAX;
4725 for_each_possible_cpu(c) {
4726 for (i = 1; i < IPSTATS_MIB_MAX; i++)
4727 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
4730 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
4731 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
4734 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4738 case IFLA_INET6_STATS:
4739 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
4740 offsetof(struct ipstats_mib, syncp));
4742 case IFLA_INET6_ICMP6STATS:
4743 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
4748 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
4749 u32 ext_filter_mask)
4752 struct ifla_cacheinfo ci;
4754 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4755 goto nla_put_failure;
4756 ci.max_reasm_len = IPV6_MAXPLEN;
4757 ci.tstamp = cstamp_delta(idev->tstamp);
4758 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4759 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
4760 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4761 goto nla_put_failure;
4762 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4764 goto nla_put_failure;
4765 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4767 /* XXX - MC not implemented */
4769 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
4772 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4774 goto nla_put_failure;
4775 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4777 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4779 goto nla_put_failure;
4780 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4782 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4784 goto nla_put_failure;
4786 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode))
4787 goto nla_put_failure;
4789 read_lock_bh(&idev->lock);
4790 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4791 read_unlock_bh(&idev->lock);
4799 static size_t inet6_get_link_af_size(const struct net_device *dev,
4800 u32 ext_filter_mask)
4802 if (!__in6_dev_get(dev))
4805 return inet6_ifla6_size();
4808 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
4809 u32 ext_filter_mask)
4811 struct inet6_dev *idev = __in6_dev_get(dev);
4816 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
4822 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4824 struct inet6_ifaddr *ifp;
4825 struct net_device *dev = idev->dev;
4826 bool update_rs = false;
4827 struct in6_addr ll_addr;
4833 if (ipv6_addr_any(token))
4835 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4837 if (!ipv6_accept_ra(idev))
4839 if (idev->cnf.rtr_solicits <= 0)
4842 write_lock_bh(&idev->lock);
4844 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4845 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4847 write_unlock_bh(&idev->lock);
4849 if (!idev->dead && (idev->if_flags & IF_READY) &&
4850 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4851 IFA_F_OPTIMISTIC)) {
4853 /* If we're not ready, then normal ifup will take care
4854 * of this. Otherwise, we need to request our rs here.
4856 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4860 write_lock_bh(&idev->lock);
4863 idev->if_flags |= IF_RS_SENT;
4864 idev->rs_probes = 1;
4865 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
4868 /* Well, that's kinda nasty ... */
4869 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4870 spin_lock(&ifp->lock);
4871 if (ifp->tokenized) {
4873 ifp->prefered_lft = 0;
4875 spin_unlock(&ifp->lock);
4878 write_unlock_bh(&idev->lock);
4879 inet6_ifinfo_notify(RTM_NEWLINK, idev);
4880 addrconf_verify_rtnl();
4884 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
4885 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
4886 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
4889 static int inet6_validate_link_af(const struct net_device *dev,
4890 const struct nlattr *nla)
4892 struct nlattr *tb[IFLA_INET6_MAX + 1];
4894 if (dev && !__in6_dev_get(dev))
4895 return -EAFNOSUPPORT;
4897 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy);
4900 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4903 struct inet6_dev *idev = __in6_dev_get(dev);
4904 struct nlattr *tb[IFLA_INET6_MAX + 1];
4907 return -EAFNOSUPPORT;
4909 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4912 if (tb[IFLA_INET6_TOKEN]) {
4913 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
4918 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
4919 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
4921 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
4922 mode != IN6_ADDR_GEN_MODE_NONE &&
4923 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY)
4926 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
4927 !idev->cnf.stable_secret.initialized &&
4928 !dev_net(dev)->ipv6.devconf_dflt->stable_secret.initialized)
4931 idev->addr_gen_mode = mode;
4938 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4939 u32 portid, u32 seq, int event, unsigned int flags)
4941 struct net_device *dev = idev->dev;
4942 struct ifinfomsg *hdr;
4943 struct nlmsghdr *nlh;
4946 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
4950 hdr = nlmsg_data(nlh);
4951 hdr->ifi_family = AF_INET6;
4953 hdr->ifi_type = dev->type;
4954 hdr->ifi_index = dev->ifindex;
4955 hdr->ifi_flags = dev_get_flags(dev);
4956 hdr->ifi_change = 0;
4958 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4960 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4961 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4962 (dev->ifindex != dev_get_iflink(dev) &&
4963 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
4964 nla_put_u8(skb, IFLA_OPERSTATE,
4965 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
4966 goto nla_put_failure;
4967 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4969 goto nla_put_failure;
4971 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
4972 goto nla_put_failure;
4974 nla_nest_end(skb, protoinfo);
4975 nlmsg_end(skb, nlh);
4979 nlmsg_cancel(skb, nlh);
4983 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4985 struct net *net = sock_net(skb->sk);
4988 struct net_device *dev;
4989 struct inet6_dev *idev;
4990 struct hlist_head *head;
4993 s_idx = cb->args[1];
4996 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4998 head = &net->dev_index_head[h];
4999 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5002 idev = __in6_dev_get(dev);
5005 if (inet6_fill_ifinfo(skb, idev,
5006 NETLINK_CB(cb->skb).portid,
5008 RTM_NEWLINK, NLM_F_MULTI) < 0)
5022 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5024 struct sk_buff *skb;
5025 struct net *net = dev_net(idev->dev);
5028 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
5032 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
5034 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5035 WARN_ON(err == -EMSGSIZE);
5039 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
5043 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
5046 static inline size_t inet6_prefix_nlmsg_size(void)
5048 return NLMSG_ALIGN(sizeof(struct prefixmsg))
5049 + nla_total_size(sizeof(struct in6_addr))
5050 + nla_total_size(sizeof(struct prefix_cacheinfo));
5053 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
5054 struct prefix_info *pinfo, u32 portid, u32 seq,
5055 int event, unsigned int flags)
5057 struct prefixmsg *pmsg;
5058 struct nlmsghdr *nlh;
5059 struct prefix_cacheinfo ci;
5061 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
5065 pmsg = nlmsg_data(nlh);
5066 pmsg->prefix_family = AF_INET6;
5067 pmsg->prefix_pad1 = 0;
5068 pmsg->prefix_pad2 = 0;
5069 pmsg->prefix_ifindex = idev->dev->ifindex;
5070 pmsg->prefix_len = pinfo->prefix_len;
5071 pmsg->prefix_type = pinfo->type;
5072 pmsg->prefix_pad3 = 0;
5073 pmsg->prefix_flags = 0;
5075 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5076 if (pinfo->autoconf)
5077 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5079 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5080 goto nla_put_failure;
5081 ci.preferred_time = ntohl(pinfo->prefered);
5082 ci.valid_time = ntohl(pinfo->valid);
5083 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5084 goto nla_put_failure;
5085 nlmsg_end(skb, nlh);
5089 nlmsg_cancel(skb, nlh);
5093 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
5094 struct prefix_info *pinfo)
5096 struct sk_buff *skb;
5097 struct net *net = dev_net(idev->dev);
5100 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
5104 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
5106 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5107 WARN_ON(err == -EMSGSIZE);
5111 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5115 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
5118 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5120 struct net *net = dev_net(ifp->idev->dev);
5125 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5130 * If the address was optimistic
5131 * we inserted the route at the start of
5132 * our DAD process, so we don't need
5135 if (!(ifp->rt->rt6i_node))
5136 ip6_ins_rt(ifp->rt);
5137 if (ifp->idev->cnf.forwarding)
5138 addrconf_join_anycast(ifp);
5139 if (!ipv6_addr_any(&ifp->peer_addr))
5140 addrconf_prefix_route(&ifp->peer_addr, 128,
5141 ifp->idev->dev, 0, 0);
5144 if (ifp->idev->cnf.forwarding)
5145 addrconf_leave_anycast(ifp);
5146 addrconf_leave_solict(ifp->idev, &ifp->addr);
5147 if (!ipv6_addr_any(&ifp->peer_addr)) {
5148 struct rt6_info *rt;
5150 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5151 ifp->idev->dev, 0, 0);
5155 dst_hold(&ifp->rt->dst);
5157 ip6_del_rt(ifp->rt);
5159 rt_genid_bump_ipv6(net);
5162 atomic_inc(&net->ipv6.dev_addr_genid);
5165 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5168 if (likely(ifp->idev->dead == 0))
5169 __ipv6_ifa_notify(event, ifp);
5170 rcu_read_unlock_bh();
5173 #ifdef CONFIG_SYSCTL
5176 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
5177 void __user *buffer, size_t *lenp, loff_t *ppos)
5179 int *valp = ctl->data;
5182 struct ctl_table lctl;
5186 * ctl->data points to idev->cnf.forwarding, we should
5187 * not modify it until we get the rtnl lock.
5192 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5195 ret = addrconf_fixup_forwarding(ctl, valp, val);
5202 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5203 void __user *buffer, size_t *lenp, loff_t *ppos)
5205 struct inet6_dev *idev = ctl->extra1;
5206 int min_mtu = IPV6_MIN_MTU;
5207 struct ctl_table lctl;
5210 lctl.extra1 = &min_mtu;
5211 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5213 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5216 static void dev_disable_change(struct inet6_dev *idev)
5218 struct netdev_notifier_info info;
5220 if (!idev || !idev->dev)
5223 netdev_notifier_info_init(&info, idev->dev);
5224 if (idev->cnf.disable_ipv6)
5225 addrconf_notify(NULL, NETDEV_DOWN, &info);
5227 addrconf_notify(NULL, NETDEV_UP, &info);
5230 static void addrconf_disable_change(struct net *net, __s32 newf)
5232 struct net_device *dev;
5233 struct inet6_dev *idev;
5236 for_each_netdev_rcu(net, dev) {
5237 idev = __in6_dev_get(dev);
5239 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5240 idev->cnf.disable_ipv6 = newf;
5242 dev_disable_change(idev);
5248 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
5253 if (!rtnl_trylock())
5254 return restart_syscall();
5256 net = (struct net *)table->extra2;
5260 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5265 if (p == &net->ipv6.devconf_all->disable_ipv6) {
5266 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5267 addrconf_disable_change(net, newf);
5268 } else if ((!newf) ^ (!old))
5269 dev_disable_change((struct inet6_dev *)table->extra1);
5276 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
5277 void __user *buffer, size_t *lenp, loff_t *ppos)
5279 int *valp = ctl->data;
5282 struct ctl_table lctl;
5286 * ctl->data points to idev->cnf.disable_ipv6, we should
5287 * not modify it until we get the rtnl lock.
5292 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5295 ret = addrconf_disable_ipv6(ctl, valp, val);
5302 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5303 void __user *buffer, size_t *lenp, loff_t *ppos)
5305 int *valp = ctl->data;
5310 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5313 if (write && old != new) {
5314 struct net *net = ctl->extra2;
5316 if (!rtnl_trylock())
5317 return restart_syscall();
5319 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5320 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5321 NETCONFA_IFINDEX_DEFAULT,
5322 net->ipv6.devconf_dflt);
5323 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5324 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5325 NETCONFA_IFINDEX_ALL,
5326 net->ipv6.devconf_all);
5328 struct inet6_dev *idev = ctl->extra1;
5330 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5340 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5341 void __user *buffer, size_t *lenp,
5345 struct in6_addr addr;
5346 char str[IPV6_MAX_STRLEN];
5347 struct ctl_table lctl = *ctl;
5348 struct net *net = ctl->extra2;
5349 struct ipv6_stable_secret *secret = ctl->data;
5351 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5354 lctl.maxlen = IPV6_MAX_STRLEN;
5357 if (!rtnl_trylock())
5358 return restart_syscall();
5360 if (!write && !secret->initialized) {
5366 err = snprintf(str, sizeof(str), "%pI6",
5368 if (err >= sizeof(str)) {
5374 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5378 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5383 secret->initialized = true;
5384 secret->secret = addr;
5386 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5387 struct net_device *dev;
5389 for_each_netdev(net, dev) {
5390 struct inet6_dev *idev = __in6_dev_get(dev);
5393 idev->addr_gen_mode =
5394 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5398 struct inet6_dev *idev = ctl->extra1;
5400 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5410 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
5412 void __user *buffer,
5416 int *valp = ctl->data;
5419 struct ctl_table lctl;
5422 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
5423 * we should not modify it until we get the rtnl lock.
5428 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5431 ret = addrconf_fixup_linkdown(ctl, valp, val);
5437 static struct addrconf_sysctl_table
5439 struct ctl_table_header *sysctl_header;
5440 struct ctl_table addrconf_vars[DEVCONF_MAX+1];
5441 } addrconf_sysctl __read_mostly = {
5442 .sysctl_header = NULL,
5445 .procname = "forwarding",
5446 .data = &ipv6_devconf.forwarding,
5447 .maxlen = sizeof(int),
5449 .proc_handler = addrconf_sysctl_forward,
5452 .procname = "hop_limit",
5453 .data = &ipv6_devconf.hop_limit,
5454 .maxlen = sizeof(int),
5456 .proc_handler = proc_dointvec,
5460 .data = &ipv6_devconf.mtu6,
5461 .maxlen = sizeof(int),
5463 .proc_handler = addrconf_sysctl_mtu,
5466 .procname = "accept_ra",
5467 .data = &ipv6_devconf.accept_ra,
5468 .maxlen = sizeof(int),
5470 .proc_handler = proc_dointvec,
5473 .procname = "accept_redirects",
5474 .data = &ipv6_devconf.accept_redirects,
5475 .maxlen = sizeof(int),
5477 .proc_handler = proc_dointvec,
5480 .procname = "autoconf",
5481 .data = &ipv6_devconf.autoconf,
5482 .maxlen = sizeof(int),
5484 .proc_handler = proc_dointvec,
5487 .procname = "dad_transmits",
5488 .data = &ipv6_devconf.dad_transmits,
5489 .maxlen = sizeof(int),
5491 .proc_handler = proc_dointvec,
5494 .procname = "router_solicitations",
5495 .data = &ipv6_devconf.rtr_solicits,
5496 .maxlen = sizeof(int),
5498 .proc_handler = proc_dointvec,
5501 .procname = "router_solicitation_interval",
5502 .data = &ipv6_devconf.rtr_solicit_interval,
5503 .maxlen = sizeof(int),
5505 .proc_handler = proc_dointvec_jiffies,
5508 .procname = "router_solicitation_delay",
5509 .data = &ipv6_devconf.rtr_solicit_delay,
5510 .maxlen = sizeof(int),
5512 .proc_handler = proc_dointvec_jiffies,
5515 .procname = "force_mld_version",
5516 .data = &ipv6_devconf.force_mld_version,
5517 .maxlen = sizeof(int),
5519 .proc_handler = proc_dointvec,
5522 .procname = "mldv1_unsolicited_report_interval",
5524 &ipv6_devconf.mldv1_unsolicited_report_interval,
5525 .maxlen = sizeof(int),
5527 .proc_handler = proc_dointvec_ms_jiffies,
5530 .procname = "mldv2_unsolicited_report_interval",
5532 &ipv6_devconf.mldv2_unsolicited_report_interval,
5533 .maxlen = sizeof(int),
5535 .proc_handler = proc_dointvec_ms_jiffies,
5538 .procname = "use_tempaddr",
5539 .data = &ipv6_devconf.use_tempaddr,
5540 .maxlen = sizeof(int),
5542 .proc_handler = proc_dointvec,
5545 .procname = "temp_valid_lft",
5546 .data = &ipv6_devconf.temp_valid_lft,
5547 .maxlen = sizeof(int),
5549 .proc_handler = proc_dointvec,
5552 .procname = "temp_prefered_lft",
5553 .data = &ipv6_devconf.temp_prefered_lft,
5554 .maxlen = sizeof(int),
5556 .proc_handler = proc_dointvec,
5559 .procname = "regen_max_retry",
5560 .data = &ipv6_devconf.regen_max_retry,
5561 .maxlen = sizeof(int),
5563 .proc_handler = proc_dointvec,
5566 .procname = "max_desync_factor",
5567 .data = &ipv6_devconf.max_desync_factor,
5568 .maxlen = sizeof(int),
5570 .proc_handler = proc_dointvec,
5573 .procname = "max_addresses",
5574 .data = &ipv6_devconf.max_addresses,
5575 .maxlen = sizeof(int),
5577 .proc_handler = proc_dointvec,
5580 .procname = "accept_ra_defrtr",
5581 .data = &ipv6_devconf.accept_ra_defrtr,
5582 .maxlen = sizeof(int),
5584 .proc_handler = proc_dointvec,
5587 .procname = "accept_ra_min_hop_limit",
5588 .data = &ipv6_devconf.accept_ra_min_hop_limit,
5589 .maxlen = sizeof(int),
5591 .proc_handler = proc_dointvec,
5594 .procname = "accept_ra_pinfo",
5595 .data = &ipv6_devconf.accept_ra_pinfo,
5596 .maxlen = sizeof(int),
5598 .proc_handler = proc_dointvec,
5600 #ifdef CONFIG_IPV6_ROUTER_PREF
5602 .procname = "accept_ra_rtr_pref",
5603 .data = &ipv6_devconf.accept_ra_rtr_pref,
5604 .maxlen = sizeof(int),
5606 .proc_handler = proc_dointvec,
5609 .procname = "router_probe_interval",
5610 .data = &ipv6_devconf.rtr_probe_interval,
5611 .maxlen = sizeof(int),
5613 .proc_handler = proc_dointvec_jiffies,
5615 #ifdef CONFIG_IPV6_ROUTE_INFO
5617 .procname = "accept_ra_rt_info_max_plen",
5618 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
5619 .maxlen = sizeof(int),
5621 .proc_handler = proc_dointvec,
5626 .procname = "proxy_ndp",
5627 .data = &ipv6_devconf.proxy_ndp,
5628 .maxlen = sizeof(int),
5630 .proc_handler = addrconf_sysctl_proxy_ndp,
5633 .procname = "accept_source_route",
5634 .data = &ipv6_devconf.accept_source_route,
5635 .maxlen = sizeof(int),
5637 .proc_handler = proc_dointvec,
5639 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5641 .procname = "optimistic_dad",
5642 .data = &ipv6_devconf.optimistic_dad,
5643 .maxlen = sizeof(int),
5645 .proc_handler = proc_dointvec,
5649 .procname = "use_optimistic",
5650 .data = &ipv6_devconf.use_optimistic,
5651 .maxlen = sizeof(int),
5653 .proc_handler = proc_dointvec,
5657 #ifdef CONFIG_IPV6_MROUTE
5659 .procname = "mc_forwarding",
5660 .data = &ipv6_devconf.mc_forwarding,
5661 .maxlen = sizeof(int),
5663 .proc_handler = proc_dointvec,
5667 .procname = "disable_ipv6",
5668 .data = &ipv6_devconf.disable_ipv6,
5669 .maxlen = sizeof(int),
5671 .proc_handler = addrconf_sysctl_disable,
5674 .procname = "accept_dad",
5675 .data = &ipv6_devconf.accept_dad,
5676 .maxlen = sizeof(int),
5678 .proc_handler = proc_dointvec,
5681 .procname = "force_tllao",
5682 .data = &ipv6_devconf.force_tllao,
5683 .maxlen = sizeof(int),
5685 .proc_handler = proc_dointvec
5688 .procname = "ndisc_notify",
5689 .data = &ipv6_devconf.ndisc_notify,
5690 .maxlen = sizeof(int),
5692 .proc_handler = proc_dointvec
5695 .procname = "suppress_frag_ndisc",
5696 .data = &ipv6_devconf.suppress_frag_ndisc,
5697 .maxlen = sizeof(int),
5699 .proc_handler = proc_dointvec
5702 .procname = "accept_ra_from_local",
5703 .data = &ipv6_devconf.accept_ra_from_local,
5704 .maxlen = sizeof(int),
5706 .proc_handler = proc_dointvec,
5709 .procname = "accept_ra_mtu",
5710 .data = &ipv6_devconf.accept_ra_mtu,
5711 .maxlen = sizeof(int),
5713 .proc_handler = proc_dointvec,
5716 .procname = "stable_secret",
5717 .data = &ipv6_devconf.stable_secret,
5718 .maxlen = IPV6_MAX_STRLEN,
5720 .proc_handler = addrconf_sysctl_stable_secret,
5723 .procname = "use_oif_addrs_only",
5724 .data = &ipv6_devconf.use_oif_addrs_only,
5725 .maxlen = sizeof(int),
5727 .proc_handler = proc_dointvec,
5730 .procname = "ignore_routes_with_linkdown",
5731 .data = &ipv6_devconf.ignore_routes_with_linkdown,
5732 .maxlen = sizeof(int),
5734 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
5742 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
5743 struct inet6_dev *idev, struct ipv6_devconf *p)
5746 struct addrconf_sysctl_table *t;
5747 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
5749 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
5753 for (i = 0; t->addrconf_vars[i].data; i++) {
5754 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
5755 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
5756 t->addrconf_vars[i].extra2 = net;
5759 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
5761 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
5762 if (!t->sysctl_header)
5774 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5776 struct addrconf_sysctl_table *t;
5783 unregister_net_sysctl_table(t->sysctl_header);
5787 static int addrconf_sysctl_register(struct inet6_dev *idev)
5791 if (!sysctl_dev_name_is_allowed(idev->dev->name))
5794 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
5795 &ndisc_ifinfo_sysctl_change);
5798 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
5801 neigh_sysctl_unregister(idev->nd_parms);
5806 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
5808 __addrconf_sysctl_unregister(&idev->cnf);
5809 neigh_sysctl_unregister(idev->nd_parms);
5815 static int __net_init addrconf_init_net(struct net *net)
5818 struct ipv6_devconf *all, *dflt;
5820 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
5824 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
5826 goto err_alloc_dflt;
5828 /* these will be inherited by all namespaces */
5829 dflt->autoconf = ipv6_defaults.autoconf;
5830 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
5832 dflt->stable_secret.initialized = false;
5833 all->stable_secret.initialized = false;
5835 net->ipv6.devconf_all = all;
5836 net->ipv6.devconf_dflt = dflt;
5838 #ifdef CONFIG_SYSCTL
5839 err = __addrconf_sysctl_register(net, "all", NULL, all);
5843 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
5849 #ifdef CONFIG_SYSCTL
5851 __addrconf_sysctl_unregister(all);
5861 static void __net_exit addrconf_exit_net(struct net *net)
5863 #ifdef CONFIG_SYSCTL
5864 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5865 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5867 kfree(net->ipv6.devconf_dflt);
5868 kfree(net->ipv6.devconf_all);
5871 static struct pernet_operations addrconf_ops = {
5872 .init = addrconf_init_net,
5873 .exit = addrconf_exit_net,
5876 static struct rtnl_af_ops inet6_ops __read_mostly = {
5878 .fill_link_af = inet6_fill_link_af,
5879 .get_link_af_size = inet6_get_link_af_size,
5880 .validate_link_af = inet6_validate_link_af,
5881 .set_link_af = inet6_set_link_af,
5885 * Init / cleanup code
5888 int __init addrconf_init(void)
5890 struct inet6_dev *idev;
5893 err = ipv6_addr_label_init();
5895 pr_crit("%s: cannot initialize default policy table: %d\n",
5900 err = register_pernet_subsys(&addrconf_ops);
5904 addrconf_wq = create_workqueue("ipv6_addrconf");
5910 /* The addrconf netdev notifier requires that loopback_dev
5911 * has it's ipv6 private information allocated and setup
5912 * before it can bring up and give link-local addresses
5913 * to other devices which are up.
5915 * Unfortunately, loopback_dev is not necessarily the first
5916 * entry in the global dev_base list of net devices. In fact,
5917 * it is likely to be the very last entry on that list.
5918 * So this causes the notifier registry below to try and
5919 * give link-local addresses to all devices besides loopback_dev
5920 * first, then loopback_dev, which cases all the non-loopback_dev
5921 * devices to fail to get a link-local address.
5923 * So, as a temporary fix, allocate the ipv6 structure for
5924 * loopback_dev first by hand.
5925 * Longer term, all of the dependencies ipv6 has upon the loopback
5926 * device and it being up should be removed.
5929 idev = ipv6_add_dev(init_net.loopback_dev);
5932 err = PTR_ERR(idev);
5936 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5937 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5939 register_netdevice_notifier(&ipv6_dev_notf);
5943 rtnl_af_register(&inet6_ops);
5945 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5950 /* Only the first call to __rtnl_register can fail */
5951 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5952 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5953 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5954 inet6_dump_ifaddr, NULL);
5955 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5956 inet6_dump_ifmcaddr, NULL);
5957 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5958 inet6_dump_ifacaddr, NULL);
5959 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
5960 inet6_netconf_dump_devconf, NULL);
5962 ipv6_addr_label_rtnl_register();
5966 rtnl_af_unregister(&inet6_ops);
5967 unregister_netdevice_notifier(&ipv6_dev_notf);
5969 destroy_workqueue(addrconf_wq);
5971 unregister_pernet_subsys(&addrconf_ops);
5973 ipv6_addr_label_cleanup();
5978 void addrconf_cleanup(void)
5980 struct net_device *dev;
5983 unregister_netdevice_notifier(&ipv6_dev_notf);
5984 unregister_pernet_subsys(&addrconf_ops);
5985 ipv6_addr_label_cleanup();
5989 __rtnl_af_unregister(&inet6_ops);
5991 /* clean dev list */
5992 for_each_netdev(&init_net, dev) {
5993 if (__in6_dev_get(dev) == NULL)
5995 addrconf_ifdown(dev, 1);
5997 addrconf_ifdown(init_net.loopback_dev, 2);
6002 spin_lock_bh(&addrconf_hash_lock);
6003 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6004 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
6005 spin_unlock_bh(&addrconf_hash_lock);
6006 cancel_delayed_work(&addr_chk_work);
6009 destroy_workqueue(addrconf_wq);