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);
421 snmp6_unregister_dev(ndev);
424 /* protected by rtnl_lock */
425 rcu_assign_pointer(dev->ip6_ptr, ndev);
427 /* Join interface-local all-node multicast group */
428 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
430 /* Join all-node multicast group */
431 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
433 /* Join all-router multicast group if forwarding is set */
434 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
435 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
440 neigh_parms_release(&nd_tbl, ndev->nd_parms);
442 in6_dev_finish_destroy(ndev);
446 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
448 struct inet6_dev *idev;
452 idev = __in6_dev_get(dev);
454 idev = ipv6_add_dev(dev);
459 if (dev->flags&IFF_UP)
464 static int inet6_netconf_msgsize_devconf(int type)
466 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
467 + nla_total_size(4); /* NETCONFA_IFINDEX */
469 /* type -1 is used for ALL */
470 if (type == -1 || type == NETCONFA_FORWARDING)
471 size += nla_total_size(4);
472 #ifdef CONFIG_IPV6_MROUTE
473 if (type == -1 || type == NETCONFA_MC_FORWARDING)
474 size += nla_total_size(4);
476 if (type == -1 || type == NETCONFA_PROXY_NEIGH)
477 size += nla_total_size(4);
479 if (type == -1 || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
480 size += nla_total_size(4);
485 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
486 struct ipv6_devconf *devconf, u32 portid,
487 u32 seq, int event, unsigned int flags,
490 struct nlmsghdr *nlh;
491 struct netconfmsg *ncm;
493 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
498 ncm = nlmsg_data(nlh);
499 ncm->ncm_family = AF_INET6;
501 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
502 goto nla_put_failure;
504 /* type -1 is used for ALL */
505 if ((type == -1 || type == NETCONFA_FORWARDING) &&
506 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
507 goto nla_put_failure;
508 #ifdef CONFIG_IPV6_MROUTE
509 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
510 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
511 devconf->mc_forwarding) < 0)
512 goto nla_put_failure;
514 if ((type == -1 || type == NETCONFA_PROXY_NEIGH) &&
515 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
516 goto nla_put_failure;
518 if ((type == -1 || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
519 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
520 devconf->ignore_routes_with_linkdown) < 0)
521 goto nla_put_failure;
527 nlmsg_cancel(skb, nlh);
531 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
532 struct ipv6_devconf *devconf)
537 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
541 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
542 RTM_NEWNETCONF, 0, type);
544 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
545 WARN_ON(err == -EMSGSIZE);
549 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
552 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
555 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
556 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
557 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
558 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
559 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
562 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
563 struct nlmsghdr *nlh)
565 struct net *net = sock_net(in_skb->sk);
566 struct nlattr *tb[NETCONFA_MAX+1];
567 struct netconfmsg *ncm;
569 struct ipv6_devconf *devconf;
570 struct inet6_dev *in6_dev;
571 struct net_device *dev;
575 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
576 devconf_ipv6_policy);
581 if (!tb[NETCONFA_IFINDEX])
584 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
586 case NETCONFA_IFINDEX_ALL:
587 devconf = net->ipv6.devconf_all;
589 case NETCONFA_IFINDEX_DEFAULT:
590 devconf = net->ipv6.devconf_dflt;
593 dev = __dev_get_by_index(net, ifindex);
596 in6_dev = __in6_dev_get(dev);
599 devconf = &in6_dev->cnf;
604 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
608 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
609 NETLINK_CB(in_skb).portid,
610 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
613 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
614 WARN_ON(err == -EMSGSIZE);
618 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
623 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
624 struct netlink_callback *cb)
626 struct net *net = sock_net(skb->sk);
629 struct net_device *dev;
630 struct inet6_dev *idev;
631 struct hlist_head *head;
634 s_idx = idx = cb->args[1];
636 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
638 head = &net->dev_index_head[h];
640 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
642 hlist_for_each_entry_rcu(dev, head, index_hlist) {
645 idev = __in6_dev_get(dev);
649 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
651 NETLINK_CB(cb->skb).portid,
659 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
665 if (h == NETDEV_HASHENTRIES) {
666 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
667 net->ipv6.devconf_all,
668 NETLINK_CB(cb->skb).portid,
670 RTM_NEWNETCONF, NLM_F_MULTI,
676 if (h == NETDEV_HASHENTRIES + 1) {
677 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
678 net->ipv6.devconf_dflt,
679 NETLINK_CB(cb->skb).portid,
681 RTM_NEWNETCONF, NLM_F_MULTI,
695 static void dev_forward_change(struct inet6_dev *idev)
697 struct net_device *dev;
698 struct inet6_ifaddr *ifa;
703 if (idev->cnf.forwarding)
704 dev_disable_lro(dev);
705 if (dev->flags & IFF_MULTICAST) {
706 if (idev->cnf.forwarding) {
707 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
708 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
709 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
711 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
712 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
713 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
717 list_for_each_entry(ifa, &idev->addr_list, if_list) {
718 if (ifa->flags&IFA_F_TENTATIVE)
720 if (idev->cnf.forwarding)
721 addrconf_join_anycast(ifa);
723 addrconf_leave_anycast(ifa);
725 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
726 dev->ifindex, &idev->cnf);
730 static void addrconf_forward_change(struct net *net, __s32 newf)
732 struct net_device *dev;
733 struct inet6_dev *idev;
735 for_each_netdev(net, dev) {
736 idev = __in6_dev_get(dev);
738 int changed = (!idev->cnf.forwarding) ^ (!newf);
739 idev->cnf.forwarding = newf;
741 dev_forward_change(idev);
746 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
752 return restart_syscall();
754 net = (struct net *)table->extra2;
758 if (p == &net->ipv6.devconf_dflt->forwarding) {
759 if ((!newf) ^ (!old))
760 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
761 NETCONFA_IFINDEX_DEFAULT,
762 net->ipv6.devconf_dflt);
767 if (p == &net->ipv6.devconf_all->forwarding) {
768 net->ipv6.devconf_dflt->forwarding = newf;
769 addrconf_forward_change(net, newf);
770 if ((!newf) ^ (!old))
771 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
772 NETCONFA_IFINDEX_ALL,
773 net->ipv6.devconf_all);
774 } else if ((!newf) ^ (!old))
775 dev_forward_change((struct inet6_dev *)table->extra1);
779 rt6_purge_dflt_routers(net);
783 static void addrconf_linkdown_change(struct net *net, __s32 newf)
785 struct net_device *dev;
786 struct inet6_dev *idev;
788 for_each_netdev(net, dev) {
789 idev = __in6_dev_get(dev);
791 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
793 idev->cnf.ignore_routes_with_linkdown = newf;
795 inet6_netconf_notify_devconf(dev_net(dev),
796 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
803 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
809 return restart_syscall();
811 net = (struct net *)table->extra2;
815 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
816 if ((!newf) ^ (!old))
817 inet6_netconf_notify_devconf(net,
818 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
819 NETCONFA_IFINDEX_DEFAULT,
820 net->ipv6.devconf_dflt);
825 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
826 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
827 addrconf_linkdown_change(net, newf);
828 if ((!newf) ^ (!old))
829 inet6_netconf_notify_devconf(net,
830 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
831 NETCONFA_IFINDEX_ALL,
832 net->ipv6.devconf_all);
841 /* Nobody refers to this ifaddr, destroy it */
842 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
844 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
846 #ifdef NET_REFCNT_DEBUG
847 pr_debug("%s\n", __func__);
850 in6_dev_put(ifp->idev);
852 if (cancel_delayed_work(&ifp->dad_work))
853 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
856 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
857 pr_warn("Freeing alive inet6 address %p\n", ifp);
866 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
869 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
872 * Each device address list is sorted in order of scope -
873 * global before linklocal.
875 list_for_each(p, &idev->addr_list) {
876 struct inet6_ifaddr *ifa
877 = list_entry(p, struct inet6_ifaddr, if_list);
878 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
882 list_add_tail(&ifp->if_list, p);
885 static u32 inet6_addr_hash(const struct in6_addr *addr)
887 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
890 /* On success it returns ifp with increased reference count */
892 static struct inet6_ifaddr *
893 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
894 const struct in6_addr *peer_addr, int pfxlen,
895 int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
897 struct inet6_ifaddr *ifa = NULL;
901 int addr_type = ipv6_addr_type(addr);
903 if (addr_type == IPV6_ADDR_ANY ||
904 addr_type & IPV6_ADDR_MULTICAST ||
905 (!(idev->dev->flags & IFF_LOOPBACK) &&
906 addr_type & IPV6_ADDR_LOOPBACK))
907 return ERR_PTR(-EADDRNOTAVAIL);
911 err = -ENODEV; /*XXX*/
915 if (idev->cnf.disable_ipv6) {
920 spin_lock(&addrconf_hash_lock);
922 /* Ignore adding duplicate addresses on an interface */
923 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
924 ADBG("ipv6_add_addr: already assigned\n");
929 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
932 ADBG("ipv6_add_addr: malloc failed\n");
937 rt = addrconf_dst_alloc(idev, addr, false);
943 neigh_parms_data_state_setall(idev->nd_parms);
947 ifa->peer_addr = *peer_addr;
949 spin_lock_init(&ifa->lock);
950 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
951 INIT_HLIST_NODE(&ifa->addr_lst);
953 ifa->prefix_len = pfxlen;
954 ifa->flags = flags | IFA_F_TENTATIVE;
955 ifa->valid_lft = valid_lft;
956 ifa->prefered_lft = prefered_lft;
957 ifa->cstamp = ifa->tstamp = jiffies;
958 ifa->tokenized = false;
967 /* Add to big hash table */
968 hash = inet6_addr_hash(addr);
970 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
971 spin_unlock(&addrconf_hash_lock);
973 write_lock(&idev->lock);
974 /* Add to inet6_dev unicast addr list. */
975 ipv6_link_dev_addr(idev, ifa);
977 if (ifa->flags&IFA_F_TEMPORARY) {
978 list_add(&ifa->tmp_list, &idev->tempaddr_list);
983 write_unlock(&idev->lock);
985 rcu_read_unlock_bh();
987 if (likely(err == 0))
988 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
996 spin_unlock(&addrconf_hash_lock);
1000 enum cleanup_prefix_rt_t {
1001 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1002 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1003 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1007 * Check, whether the prefix for ifp would still need a prefix route
1008 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1011 * 1) we don't purge prefix if address was not permanent.
1012 * prefix is managed by its own lifetime.
1013 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1014 * 3) if there are no addresses, delete prefix.
1015 * 4) if there are still other permanent address(es),
1016 * corresponding prefix is still permanent.
1017 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1018 * don't purge the prefix, assume user space is managing it.
1019 * 6) otherwise, update prefix lifetime to the
1020 * longest valid lifetime among the corresponding
1021 * addresses on the device.
1022 * Note: subsequent RA will update lifetime.
1024 static enum cleanup_prefix_rt_t
1025 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1027 struct inet6_ifaddr *ifa;
1028 struct inet6_dev *idev = ifp->idev;
1029 unsigned long lifetime;
1030 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1034 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1037 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1040 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1041 return CLEANUP_PREFIX_RT_NOP;
1043 action = CLEANUP_PREFIX_RT_EXPIRE;
1045 spin_lock(&ifa->lock);
1047 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1049 * Note: Because this address is
1050 * not permanent, lifetime <
1051 * LONG_MAX / HZ here.
1053 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1054 *expires = ifa->tstamp + lifetime * HZ;
1055 spin_unlock(&ifa->lock);
1062 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
1064 struct rt6_info *rt;
1066 rt = addrconf_get_prefix_route(&ifp->addr,
1069 0, RTF_GATEWAY | RTF_DEFAULT);
1074 if (!(rt->rt6i_flags & RTF_EXPIRES))
1075 rt6_set_expires(rt, expires);
1082 /* This function wants to get referenced ifp and releases it before return */
1084 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1087 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1088 unsigned long expires;
1092 spin_lock_bh(&ifp->lock);
1094 ifp->state = INET6_IFADDR_STATE_DEAD;
1095 spin_unlock_bh(&ifp->lock);
1097 if (state == INET6_IFADDR_STATE_DEAD)
1100 spin_lock_bh(&addrconf_hash_lock);
1101 hlist_del_init_rcu(&ifp->addr_lst);
1102 spin_unlock_bh(&addrconf_hash_lock);
1104 write_lock_bh(&ifp->idev->lock);
1106 if (ifp->flags&IFA_F_TEMPORARY) {
1107 list_del(&ifp->tmp_list);
1109 in6_ifa_put(ifp->ifpub);
1115 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1116 action = check_cleanup_prefix_route(ifp, &expires);
1118 list_del_init(&ifp->if_list);
1121 write_unlock_bh(&ifp->idev->lock);
1123 addrconf_del_dad_work(ifp);
1125 ipv6_ifa_notify(RTM_DELADDR, ifp);
1127 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1129 if (action != CLEANUP_PREFIX_RT_NOP) {
1130 cleanup_prefix_route(ifp, expires,
1131 action == CLEANUP_PREFIX_RT_DEL);
1134 /* clean up prefsrc entries */
1135 rt6_remove_prefsrc(ifp);
1140 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1142 struct inet6_dev *idev = ifp->idev;
1143 struct in6_addr addr, *tmpaddr;
1144 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1145 unsigned long regen_advance;
1149 unsigned long now = jiffies;
1151 write_lock_bh(&idev->lock);
1153 spin_lock_bh(&ift->lock);
1154 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1155 spin_unlock_bh(&ift->lock);
1162 if (idev->cnf.use_tempaddr <= 0) {
1163 write_unlock_bh(&idev->lock);
1164 pr_info("%s: use_tempaddr is disabled\n", __func__);
1169 spin_lock_bh(&ifp->lock);
1170 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1171 idev->cnf.use_tempaddr = -1; /*XXX*/
1172 spin_unlock_bh(&ifp->lock);
1173 write_unlock_bh(&idev->lock);
1174 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1181 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1182 __ipv6_try_regen_rndid(idev, tmpaddr);
1183 memcpy(&addr.s6_addr[8], idev->rndid, 8);
1184 age = (now - ifp->tstamp) / HZ;
1185 tmp_valid_lft = min_t(__u32,
1187 idev->cnf.temp_valid_lft + age);
1188 tmp_prefered_lft = min_t(__u32,
1190 idev->cnf.temp_prefered_lft + age -
1191 idev->cnf.max_desync_factor);
1192 tmp_plen = ifp->prefix_len;
1193 tmp_tstamp = ifp->tstamp;
1194 spin_unlock_bh(&ifp->lock);
1196 regen_advance = idev->cnf.regen_max_retry *
1197 idev->cnf.dad_transmits *
1198 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1199 write_unlock_bh(&idev->lock);
1201 /* A temporary address is created only if this calculated Preferred
1202 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1203 * an implementation must not create a temporary address with a zero
1204 * Preferred Lifetime.
1205 * Use age calculation as in addrconf_verify to avoid unnecessary
1206 * temporary addresses being generated.
1208 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1209 if (tmp_prefered_lft <= regen_advance + age) {
1216 addr_flags = IFA_F_TEMPORARY;
1217 /* set in addrconf_prefix_rcv() */
1218 if (ifp->flags & IFA_F_OPTIMISTIC)
1219 addr_flags |= IFA_F_OPTIMISTIC;
1221 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1222 ipv6_addr_scope(&addr), addr_flags,
1223 tmp_valid_lft, tmp_prefered_lft);
1227 pr_info("%s: retry temporary address regeneration\n", __func__);
1229 write_lock_bh(&idev->lock);
1233 spin_lock_bh(&ift->lock);
1236 ift->tstamp = tmp_tstamp;
1237 spin_unlock_bh(&ift->lock);
1239 addrconf_dad_start(ift);
1247 * Choose an appropriate source address (RFC3484)
1250 IPV6_SADDR_RULE_INIT = 0,
1251 IPV6_SADDR_RULE_LOCAL,
1252 IPV6_SADDR_RULE_SCOPE,
1253 IPV6_SADDR_RULE_PREFERRED,
1254 #ifdef CONFIG_IPV6_MIP6
1255 IPV6_SADDR_RULE_HOA,
1257 IPV6_SADDR_RULE_OIF,
1258 IPV6_SADDR_RULE_LABEL,
1259 IPV6_SADDR_RULE_PRIVACY,
1260 IPV6_SADDR_RULE_ORCHID,
1261 IPV6_SADDR_RULE_PREFIX,
1262 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1263 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1268 struct ipv6_saddr_score {
1271 struct inet6_ifaddr *ifa;
1272 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1277 struct ipv6_saddr_dst {
1278 const struct in6_addr *addr;
1285 static inline int ipv6_saddr_preferred(int type)
1287 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1292 static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev)
1294 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1295 return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic;
1301 static int ipv6_get_saddr_eval(struct net *net,
1302 struct ipv6_saddr_score *score,
1303 struct ipv6_saddr_dst *dst,
1308 if (i <= score->rule) {
1310 case IPV6_SADDR_RULE_SCOPE:
1311 ret = score->scopedist;
1313 case IPV6_SADDR_RULE_PREFIX:
1314 ret = score->matchlen;
1317 ret = !!test_bit(i, score->scorebits);
1323 case IPV6_SADDR_RULE_INIT:
1324 /* Rule 0: remember if hiscore is not ready yet */
1327 case IPV6_SADDR_RULE_LOCAL:
1328 /* Rule 1: Prefer same address */
1329 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1331 case IPV6_SADDR_RULE_SCOPE:
1332 /* Rule 2: Prefer appropriate scope
1337 * ---+--+-+---> scope
1339 * | d is scope of the destination.
1341 * | \ <- smaller scope is better if
1342 * B-15 | \ if scope is enough for destination.
1343 * | ret = B - scope (-1 <= scope >= d <= 15).
1345 * |/ <- greater is better
1346 * -C / if scope is not enough for destination.
1347 * /| ret = scope - C (-1 <= d < scope <= 15).
1349 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1350 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1351 * Assume B = 0 and we get C > 29.
1353 ret = __ipv6_addr_src_scope(score->addr_type);
1354 if (ret >= dst->scope)
1357 ret -= 128; /* 30 is enough */
1358 score->scopedist = ret;
1360 case IPV6_SADDR_RULE_PREFERRED:
1362 /* Rule 3: Avoid deprecated and optimistic addresses */
1363 u8 avoid = IFA_F_DEPRECATED;
1365 if (!ipv6_use_optimistic_addr(score->ifa->idev))
1366 avoid |= IFA_F_OPTIMISTIC;
1367 ret = ipv6_saddr_preferred(score->addr_type) ||
1368 !(score->ifa->flags & avoid);
1371 #ifdef CONFIG_IPV6_MIP6
1372 case IPV6_SADDR_RULE_HOA:
1374 /* Rule 4: Prefer home address */
1375 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1376 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1380 case IPV6_SADDR_RULE_OIF:
1381 /* Rule 5: Prefer outgoing interface */
1382 ret = (!dst->ifindex ||
1383 dst->ifindex == score->ifa->idev->dev->ifindex);
1385 case IPV6_SADDR_RULE_LABEL:
1386 /* Rule 6: Prefer matching label */
1387 ret = ipv6_addr_label(net,
1388 &score->ifa->addr, score->addr_type,
1389 score->ifa->idev->dev->ifindex) == dst->label;
1391 case IPV6_SADDR_RULE_PRIVACY:
1393 /* Rule 7: Prefer public address
1394 * Note: prefer temporary address if use_tempaddr >= 2
1396 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1397 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1398 score->ifa->idev->cnf.use_tempaddr >= 2;
1399 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1402 case IPV6_SADDR_RULE_ORCHID:
1403 /* Rule 8-: Prefer ORCHID vs ORCHID or
1404 * non-ORCHID vs non-ORCHID
1406 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1407 ipv6_addr_orchid(dst->addr));
1409 case IPV6_SADDR_RULE_PREFIX:
1410 /* Rule 8: Use longest matching prefix */
1411 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1412 if (ret > score->ifa->prefix_len)
1413 ret = score->ifa->prefix_len;
1414 score->matchlen = ret;
1416 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1417 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1418 /* Optimistic addresses still have lower precedence than other
1419 * preferred addresses.
1421 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1429 __set_bit(i, score->scorebits);
1435 static int __ipv6_dev_get_saddr(struct net *net,
1436 struct ipv6_saddr_dst *dst,
1437 struct inet6_dev *idev,
1438 struct ipv6_saddr_score *scores,
1441 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1443 read_lock_bh(&idev->lock);
1444 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1448 * - Tentative Address (RFC2462 section 5.4)
1449 * - A tentative address is not considered
1450 * "assigned to an interface" in the traditional
1451 * sense, unless it is also flagged as optimistic.
1452 * - Candidate Source Address (section 4)
1453 * - In any case, anycast addresses, multicast
1454 * addresses, and the unspecified address MUST
1455 * NOT be included in a candidate set.
1457 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1458 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1461 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1463 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1464 score->addr_type & IPV6_ADDR_MULTICAST)) {
1465 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1471 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1473 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1474 int minihiscore, miniscore;
1476 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1477 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1479 if (minihiscore > miniscore) {
1480 if (i == IPV6_SADDR_RULE_SCOPE &&
1481 score->scopedist > 0) {
1484 * each remaining entry
1485 * has too small (not enough)
1486 * scope, because ifa entries
1487 * are sorted by their scope
1493 } else if (minihiscore < miniscore) {
1495 in6_ifa_put(hiscore->ifa);
1497 in6_ifa_hold(score->ifa);
1499 swap(hiscore, score);
1500 hiscore_idx = 1 - hiscore_idx;
1502 /* restore our iterator */
1503 score->ifa = hiscore->ifa;
1510 read_unlock_bh(&idev->lock);
1514 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1515 const struct in6_addr *daddr, unsigned int prefs,
1516 struct in6_addr *saddr)
1518 struct ipv6_saddr_score scores[2], *hiscore;
1519 struct ipv6_saddr_dst dst;
1520 struct inet6_dev *idev;
1521 struct net_device *dev;
1523 bool use_oif_addr = false;
1524 int hiscore_idx = 0;
1526 dst_type = __ipv6_addr_type(daddr);
1528 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1529 dst.scope = __ipv6_addr_src_scope(dst_type);
1530 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1533 scores[hiscore_idx].rule = -1;
1534 scores[hiscore_idx].ifa = NULL;
1538 /* Candidate Source Address (section 4)
1539 * - multicast and link-local destination address,
1540 * the set of candidate source address MUST only
1541 * include addresses assigned to interfaces
1542 * belonging to the same link as the outgoing
1544 * (- For site-local destination addresses, the
1545 * set of candidate source addresses MUST only
1546 * include addresses assigned to interfaces
1547 * belonging to the same site as the outgoing
1549 * - "It is RECOMMENDED that the candidate source addresses
1550 * be the set of unicast addresses assigned to the
1551 * interface that will be used to send to the destination
1552 * (the 'outgoing' interface)." (RFC 6724)
1555 idev = __in6_dev_get(dst_dev);
1556 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1557 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1558 (idev && idev->cnf.use_oif_addrs_only)) {
1559 use_oif_addr = true;
1565 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1567 for_each_netdev_rcu(net, dev) {
1568 idev = __in6_dev_get(dev);
1571 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1576 hiscore = &scores[hiscore_idx];
1578 return -EADDRNOTAVAIL;
1580 *saddr = hiscore->ifa->addr;
1581 in6_ifa_put(hiscore->ifa);
1584 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1586 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1589 struct inet6_ifaddr *ifp;
1590 int err = -EADDRNOTAVAIL;
1592 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1593 if (ifp->scope > IFA_LINK)
1595 if (ifp->scope == IFA_LINK &&
1596 !(ifp->flags & banned_flags)) {
1605 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1608 struct inet6_dev *idev;
1609 int err = -EADDRNOTAVAIL;
1612 idev = __in6_dev_get(dev);
1614 read_lock_bh(&idev->lock);
1615 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1616 read_unlock_bh(&idev->lock);
1622 static int ipv6_count_addresses(struct inet6_dev *idev)
1625 struct inet6_ifaddr *ifp;
1627 read_lock_bh(&idev->lock);
1628 list_for_each_entry(ifp, &idev->addr_list, if_list)
1630 read_unlock_bh(&idev->lock);
1634 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1635 const struct net_device *dev, int strict)
1637 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
1639 EXPORT_SYMBOL(ipv6_chk_addr);
1641 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1642 const struct net_device *dev, int strict,
1645 struct inet6_ifaddr *ifp;
1646 unsigned int hash = inet6_addr_hash(addr);
1650 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1651 if (!net_eq(dev_net(ifp->idev->dev), net))
1653 /* Decouple optimistic from tentative for evaluation here.
1654 * Ban optimistic addresses explicitly, when required.
1656 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1657 ? (ifp->flags&~IFA_F_TENTATIVE)
1659 if (ipv6_addr_equal(&ifp->addr, addr) &&
1660 !(ifp_flags&banned_flags) &&
1661 (!dev || ifp->idev->dev == dev ||
1662 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1663 rcu_read_unlock_bh();
1668 rcu_read_unlock_bh();
1671 EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1673 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1674 struct net_device *dev)
1676 unsigned int hash = inet6_addr_hash(addr);
1677 struct inet6_ifaddr *ifp;
1679 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1680 if (!net_eq(dev_net(ifp->idev->dev), net))
1682 if (ipv6_addr_equal(&ifp->addr, addr)) {
1683 if (!dev || ifp->idev->dev == dev)
1690 /* Compares an address/prefix_len with addresses on device @dev.
1691 * If one is found it returns true.
1693 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1694 const unsigned int prefix_len, struct net_device *dev)
1696 struct inet6_dev *idev;
1697 struct inet6_ifaddr *ifa;
1701 idev = __in6_dev_get(dev);
1703 read_lock_bh(&idev->lock);
1704 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1705 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1709 read_unlock_bh(&idev->lock);
1715 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1717 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1719 struct inet6_dev *idev;
1720 struct inet6_ifaddr *ifa;
1725 idev = __in6_dev_get(dev);
1727 read_lock_bh(&idev->lock);
1728 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1729 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1734 read_unlock_bh(&idev->lock);
1739 EXPORT_SYMBOL(ipv6_chk_prefix);
1741 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1742 struct net_device *dev, int strict)
1744 struct inet6_ifaddr *ifp, *result = NULL;
1745 unsigned int hash = inet6_addr_hash(addr);
1748 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1749 if (!net_eq(dev_net(ifp->idev->dev), net))
1751 if (ipv6_addr_equal(&ifp->addr, addr)) {
1752 if (!dev || ifp->idev->dev == dev ||
1753 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1760 rcu_read_unlock_bh();
1765 /* Gets referenced address, destroys ifaddr */
1767 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1769 if (ifp->flags&IFA_F_PERMANENT) {
1770 spin_lock_bh(&ifp->lock);
1771 addrconf_del_dad_work(ifp);
1772 ifp->flags |= IFA_F_TENTATIVE;
1774 ifp->flags |= IFA_F_DADFAILED;
1775 spin_unlock_bh(&ifp->lock);
1777 ipv6_ifa_notify(0, ifp);
1779 } else if (ifp->flags&IFA_F_TEMPORARY) {
1780 struct inet6_ifaddr *ifpub;
1781 spin_lock_bh(&ifp->lock);
1784 in6_ifa_hold(ifpub);
1785 spin_unlock_bh(&ifp->lock);
1786 ipv6_create_tempaddr(ifpub, ifp);
1789 spin_unlock_bh(&ifp->lock);
1797 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1801 spin_lock_bh(&ifp->lock);
1802 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1803 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1806 spin_unlock_bh(&ifp->lock);
1811 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1813 struct in6_addr addr;
1814 struct inet6_dev *idev = ifp->idev;
1815 struct net *net = dev_net(ifp->idev->dev);
1817 if (addrconf_dad_end(ifp)) {
1822 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1823 ifp->idev->dev->name, &ifp->addr);
1825 spin_lock_bh(&ifp->lock);
1827 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
1828 int scope = ifp->scope;
1829 u32 flags = ifp->flags;
1830 struct in6_addr new_addr;
1831 struct inet6_ifaddr *ifp2;
1832 u32 valid_lft, preferred_lft;
1833 int pfxlen = ifp->prefix_len;
1834 int retries = ifp->stable_privacy_retry + 1;
1836 if (retries > net->ipv6.sysctl.idgen_retries) {
1837 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
1838 ifp->idev->dev->name);
1842 new_addr = ifp->addr;
1843 if (ipv6_generate_stable_address(&new_addr, retries,
1847 valid_lft = ifp->valid_lft;
1848 preferred_lft = ifp->prefered_lft;
1850 spin_unlock_bh(&ifp->lock);
1852 if (idev->cnf.max_addresses &&
1853 ipv6_count_addresses(idev) >=
1854 idev->cnf.max_addresses)
1857 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
1858 ifp->idev->dev->name);
1860 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
1861 scope, flags, valid_lft,
1866 spin_lock_bh(&ifp2->lock);
1867 ifp2->stable_privacy_retry = retries;
1868 ifp2->state = INET6_IFADDR_STATE_PREDAD;
1869 spin_unlock_bh(&ifp2->lock);
1871 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
1874 spin_lock_bh(&ifp->lock);
1875 } else if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1876 addr.s6_addr32[0] = htonl(0xfe800000);
1877 addr.s6_addr32[1] = 0;
1879 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1880 ipv6_addr_equal(&ifp->addr, &addr)) {
1881 /* DAD failed for link-local based on MAC address */
1882 idev->cnf.disable_ipv6 = 1;
1884 pr_info("%s: IPv6 being disabled!\n",
1885 ifp->idev->dev->name);
1890 /* transition from _POSTDAD to _ERRDAD */
1891 ifp->state = INET6_IFADDR_STATE_ERRDAD;
1892 spin_unlock_bh(&ifp->lock);
1894 addrconf_mod_dad_work(ifp, 0);
1897 /* Join to solicited addr multicast group.
1898 * caller must hold RTNL */
1899 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1901 struct in6_addr maddr;
1903 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1906 addrconf_addr_solict_mult(addr, &maddr);
1907 ipv6_dev_mc_inc(dev, &maddr);
1910 /* caller must hold RTNL */
1911 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1913 struct in6_addr maddr;
1915 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1918 addrconf_addr_solict_mult(addr, &maddr);
1919 __ipv6_dev_mc_dec(idev, &maddr);
1922 /* caller must hold RTNL */
1923 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1925 struct in6_addr addr;
1927 if (ifp->prefix_len >= 127) /* RFC 6164 */
1929 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1930 if (ipv6_addr_any(&addr))
1932 __ipv6_dev_ac_inc(ifp->idev, &addr);
1935 /* caller must hold RTNL */
1936 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1938 struct in6_addr addr;
1940 if (ifp->prefix_len >= 127) /* RFC 6164 */
1942 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1943 if (ipv6_addr_any(&addr))
1945 __ipv6_dev_ac_dec(ifp->idev, &addr);
1948 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1950 if (dev->addr_len != IEEE802154_ADDR_LEN)
1952 memcpy(eui, dev->dev_addr, 8);
1957 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1959 union fwnet_hwaddr *ha;
1961 if (dev->addr_len != FWNET_ALEN)
1964 ha = (union fwnet_hwaddr *)dev->dev_addr;
1966 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1971 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1973 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1974 if (dev->addr_len != ARCNET_ALEN)
1977 eui[7] = *(u8 *)dev->dev_addr;
1981 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1983 if (dev->addr_len != INFINIBAND_ALEN)
1985 memcpy(eui, dev->dev_addr + 12, 8);
1990 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1994 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1995 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1996 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1997 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1998 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1999 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2003 memcpy(eui + 4, &addr, 4);
2007 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2009 if (dev->priv_flags & IFF_ISATAP)
2010 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2014 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2016 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2019 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2021 memcpy(eui, dev->perm_addr, 3);
2022 memcpy(eui + 5, dev->perm_addr + 3, 3);
2029 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2031 switch (dev->type) {
2034 return addrconf_ifid_eui48(eui, dev);
2036 return addrconf_ifid_arcnet(eui, dev);
2037 case ARPHRD_INFINIBAND:
2038 return addrconf_ifid_infiniband(eui, dev);
2040 return addrconf_ifid_sit(eui, dev);
2042 return addrconf_ifid_gre(eui, dev);
2043 case ARPHRD_6LOWPAN:
2044 case ARPHRD_IEEE802154:
2045 return addrconf_ifid_eui64(eui, dev);
2046 case ARPHRD_IEEE1394:
2047 return addrconf_ifid_ieee1394(eui, dev);
2048 case ARPHRD_TUNNEL6:
2049 return addrconf_ifid_ip6tnl(eui, dev);
2054 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2057 struct inet6_ifaddr *ifp;
2059 read_lock_bh(&idev->lock);
2060 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2061 if (ifp->scope > IFA_LINK)
2063 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2064 memcpy(eui, ifp->addr.s6_addr+8, 8);
2069 read_unlock_bh(&idev->lock);
2073 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
2074 static void __ipv6_regen_rndid(struct inet6_dev *idev)
2077 get_random_bytes(idev->rndid, sizeof(idev->rndid));
2078 idev->rndid[0] &= ~0x02;
2081 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2082 * check if generated address is not inappropriate
2084 * - Reserved subnet anycast (RFC 2526)
2085 * 11111101 11....11 1xxxxxxx
2086 * - ISATAP (RFC4214) 6.1
2087 * 00-00-5E-FE-xx-xx-xx-xx
2089 * - XXX: already assigned to an address on the device
2091 if (idev->rndid[0] == 0xfd &&
2092 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2093 (idev->rndid[7]&0x80))
2095 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2096 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2098 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2103 static void ipv6_regen_rndid(unsigned long data)
2105 struct inet6_dev *idev = (struct inet6_dev *) data;
2106 unsigned long expires;
2109 write_lock_bh(&idev->lock);
2114 __ipv6_regen_rndid(idev);
2117 idev->cnf.temp_prefered_lft * HZ -
2118 idev->cnf.regen_max_retry * idev->cnf.dad_transmits *
2119 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) -
2120 idev->cnf.max_desync_factor * HZ;
2121 if (time_before(expires, jiffies)) {
2122 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
2123 __func__, idev->dev->name);
2127 if (!mod_timer(&idev->regen_timer, expires))
2131 write_unlock_bh(&idev->lock);
2132 rcu_read_unlock_bh();
2136 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
2138 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
2139 __ipv6_regen_rndid(idev);
2147 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
2148 unsigned long expires, u32 flags)
2150 struct fib6_config cfg = {
2151 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
2152 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2153 .fc_ifindex = dev->ifindex,
2154 .fc_expires = expires,
2156 .fc_flags = RTF_UP | flags,
2157 .fc_nlinfo.nl_net = dev_net(dev),
2158 .fc_protocol = RTPROT_KERNEL,
2163 /* Prevent useless cloning on PtP SIT.
2164 This thing is done here expecting that the whole
2165 class of non-broadcast devices need not cloning.
2167 #if IS_ENABLED(CONFIG_IPV6_SIT)
2168 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2169 cfg.fc_flags |= RTF_NONEXTHOP;
2172 ip6_route_add(&cfg);
2176 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2178 const struct net_device *dev,
2179 u32 flags, u32 noflags)
2181 struct fib6_node *fn;
2182 struct rt6_info *rt = NULL;
2183 struct fib6_table *table;
2184 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
2186 table = fib6_get_table(dev_net(dev), tb_id);
2190 read_lock_bh(&table->tb6_lock);
2191 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2195 noflags |= RTF_CACHE;
2196 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2197 if (rt->dst.dev->ifindex != dev->ifindex)
2199 if ((rt->rt6i_flags & flags) != flags)
2201 if ((rt->rt6i_flags & noflags) != 0)
2207 read_unlock_bh(&table->tb6_lock);
2212 /* Create "default" multicast route to the interface */
2214 static void addrconf_add_mroute(struct net_device *dev)
2216 struct fib6_config cfg = {
2217 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2218 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2219 .fc_ifindex = dev->ifindex,
2222 .fc_nlinfo.nl_net = dev_net(dev),
2225 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2227 ip6_route_add(&cfg);
2230 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2232 struct inet6_dev *idev;
2236 idev = ipv6_find_idev(dev);
2238 return ERR_PTR(-ENOBUFS);
2240 if (idev->cnf.disable_ipv6)
2241 return ERR_PTR(-EACCES);
2243 /* Add default multicast route */
2244 if (!(dev->flags & IFF_LOOPBACK))
2245 addrconf_add_mroute(dev);
2250 static void manage_tempaddrs(struct inet6_dev *idev,
2251 struct inet6_ifaddr *ifp,
2252 __u32 valid_lft, __u32 prefered_lft,
2253 bool create, unsigned long now)
2256 struct inet6_ifaddr *ift;
2258 read_lock_bh(&idev->lock);
2259 /* update all temporary addresses in the list */
2260 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2261 int age, max_valid, max_prefered;
2263 if (ifp != ift->ifpub)
2266 /* RFC 4941 section 3.3:
2267 * If a received option will extend the lifetime of a public
2268 * address, the lifetimes of temporary addresses should
2269 * be extended, subject to the overall constraint that no
2270 * temporary addresses should ever remain "valid" or "preferred"
2271 * for a time longer than (TEMP_VALID_LIFETIME) or
2272 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2274 age = (now - ift->cstamp) / HZ;
2275 max_valid = idev->cnf.temp_valid_lft - age;
2279 max_prefered = idev->cnf.temp_prefered_lft -
2280 idev->cnf.max_desync_factor - age;
2281 if (max_prefered < 0)
2284 if (valid_lft > max_valid)
2285 valid_lft = max_valid;
2287 if (prefered_lft > max_prefered)
2288 prefered_lft = max_prefered;
2290 spin_lock(&ift->lock);
2292 ift->valid_lft = valid_lft;
2293 ift->prefered_lft = prefered_lft;
2295 if (prefered_lft > 0)
2296 ift->flags &= ~IFA_F_DEPRECATED;
2298 spin_unlock(&ift->lock);
2299 if (!(flags&IFA_F_TENTATIVE))
2300 ipv6_ifa_notify(0, ift);
2303 if ((create || list_empty(&idev->tempaddr_list)) &&
2304 idev->cnf.use_tempaddr > 0) {
2305 /* When a new public address is created as described
2306 * in [ADDRCONF], also create a new temporary address.
2307 * Also create a temporary address if it's enabled but
2308 * no temporary address currently exists.
2310 read_unlock_bh(&idev->lock);
2311 ipv6_create_tempaddr(ifp, NULL);
2313 read_unlock_bh(&idev->lock);
2317 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2319 struct prefix_info *pinfo;
2324 struct inet6_dev *in6_dev;
2325 struct net *net = dev_net(dev);
2327 pinfo = (struct prefix_info *) opt;
2329 if (len < sizeof(struct prefix_info)) {
2330 ADBG("addrconf: prefix option too short\n");
2335 * Validation checks ([ADDRCONF], page 19)
2338 addr_type = ipv6_addr_type(&pinfo->prefix);
2340 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2343 valid_lft = ntohl(pinfo->valid);
2344 prefered_lft = ntohl(pinfo->prefered);
2346 if (prefered_lft > valid_lft) {
2347 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2351 in6_dev = in6_dev_get(dev);
2354 net_dbg_ratelimited("addrconf: device %s not configured\n",
2360 * Two things going on here:
2361 * 1) Add routes for on-link prefixes
2362 * 2) Configure prefixes with the auto flag set
2365 if (pinfo->onlink) {
2366 struct rt6_info *rt;
2367 unsigned long rt_expires;
2369 /* Avoid arithmetic overflow. Really, we could
2370 * save rt_expires in seconds, likely valid_lft,
2371 * but it would require division in fib gc, that it
2375 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2377 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2379 if (addrconf_finite_timeout(rt_expires))
2382 rt = addrconf_get_prefix_route(&pinfo->prefix,
2385 RTF_ADDRCONF | RTF_PREFIX_RT,
2386 RTF_GATEWAY | RTF_DEFAULT);
2389 /* Autoconf prefix route */
2390 if (valid_lft == 0) {
2393 } else if (addrconf_finite_timeout(rt_expires)) {
2395 rt6_set_expires(rt, jiffies + rt_expires);
2397 rt6_clean_expires(rt);
2399 } else if (valid_lft) {
2400 clock_t expires = 0;
2401 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2402 if (addrconf_finite_timeout(rt_expires)) {
2404 flags |= RTF_EXPIRES;
2405 expires = jiffies_to_clock_t(rt_expires);
2407 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2408 dev, expires, flags);
2413 /* Try to figure out our local address for this prefix */
2415 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2416 struct inet6_ifaddr *ifp;
2417 struct in6_addr addr;
2418 int create = 0, update_lft = 0;
2419 bool tokenized = false;
2421 if (pinfo->prefix_len == 64) {
2422 memcpy(&addr, &pinfo->prefix, 8);
2424 if (!ipv6_addr_any(&in6_dev->token)) {
2425 read_lock_bh(&in6_dev->lock);
2426 memcpy(addr.s6_addr + 8,
2427 in6_dev->token.s6_addr + 8, 8);
2428 read_unlock_bh(&in6_dev->lock);
2430 } else if (in6_dev->addr_gen_mode ==
2431 IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
2432 !ipv6_generate_stable_address(&addr, 0,
2434 addr_flags |= IFA_F_STABLE_PRIVACY;
2436 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2437 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2438 in6_dev_put(in6_dev);
2443 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2445 in6_dev_put(in6_dev);
2450 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
2452 if (!ifp && valid_lft) {
2453 int max_addresses = in6_dev->cnf.max_addresses;
2455 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2456 if (in6_dev->cnf.optimistic_dad &&
2457 !net->ipv6.devconf_all->forwarding && sllao)
2458 addr_flags = IFA_F_OPTIMISTIC;
2461 /* Do not allow to create too much of autoconfigured
2462 * addresses; this would be too easy way to crash kernel.
2464 if (!max_addresses ||
2465 ipv6_count_addresses(in6_dev) < max_addresses)
2466 ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2468 addr_type&IPV6_ADDR_SCOPE_MASK,
2469 addr_flags, valid_lft,
2472 if (IS_ERR_OR_NULL(ifp)) {
2473 in6_dev_put(in6_dev);
2479 spin_lock_bh(&ifp->lock);
2480 ifp->flags |= IFA_F_MANAGETEMPADDR;
2481 ifp->cstamp = jiffies;
2482 ifp->tokenized = tokenized;
2483 spin_unlock_bh(&ifp->lock);
2484 addrconf_dad_start(ifp);
2492 /* update lifetime (RFC2462 5.5.3 e) */
2493 spin_lock_bh(&ifp->lock);
2495 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2496 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2499 if (!update_lft && !create && stored_lft) {
2500 const u32 minimum_lft = min_t(u32,
2501 stored_lft, MIN_VALID_LIFETIME);
2502 valid_lft = max(valid_lft, minimum_lft);
2504 /* RFC4862 Section 5.5.3e:
2505 * "Note that the preferred lifetime of the
2506 * corresponding address is always reset to
2507 * the Preferred Lifetime in the received
2508 * Prefix Information option, regardless of
2509 * whether the valid lifetime is also reset or
2512 * So we should always update prefered_lft here.
2518 ifp->valid_lft = valid_lft;
2519 ifp->prefered_lft = prefered_lft;
2522 ifp->flags &= ~IFA_F_DEPRECATED;
2523 spin_unlock_bh(&ifp->lock);
2525 if (!(flags&IFA_F_TENTATIVE))
2526 ipv6_ifa_notify(0, ifp);
2528 spin_unlock_bh(&ifp->lock);
2530 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2537 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2538 in6_dev_put(in6_dev);
2542 * Set destination address.
2543 * Special case for SIT interfaces where we create a new "virtual"
2546 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2548 struct in6_ifreq ireq;
2549 struct net_device *dev;
2555 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2558 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2564 #if IS_ENABLED(CONFIG_IPV6_SIT)
2565 if (dev->type == ARPHRD_SIT) {
2566 const struct net_device_ops *ops = dev->netdev_ops;
2568 struct ip_tunnel_parm p;
2570 err = -EADDRNOTAVAIL;
2571 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2574 memset(&p, 0, sizeof(p));
2575 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2579 p.iph.protocol = IPPROTO_IPV6;
2581 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2583 if (ops->ndo_do_ioctl) {
2584 mm_segment_t oldfs = get_fs();
2587 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2594 dev = __dev_get_by_name(net, p.name);
2597 err = dev_open(dev);
2607 static int ipv6_mc_config(struct sock *sk, bool join,
2608 const struct in6_addr *addr, int ifindex)
2616 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2618 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2625 * Manual configuration of address on an interface
2627 static int inet6_addr_add(struct net *net, int ifindex,
2628 const struct in6_addr *pfx,
2629 const struct in6_addr *peer_pfx,
2630 unsigned int plen, __u32 ifa_flags,
2631 __u32 prefered_lft, __u32 valid_lft)
2633 struct inet6_ifaddr *ifp;
2634 struct inet6_dev *idev;
2635 struct net_device *dev;
2636 unsigned long timeout;
2646 /* check the lifetime */
2647 if (!valid_lft || prefered_lft > valid_lft)
2650 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2653 dev = __dev_get_by_index(net, ifindex);
2657 idev = addrconf_add_dev(dev);
2659 return PTR_ERR(idev);
2661 if (ifa_flags & IFA_F_MCAUTOJOIN) {
2662 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2663 true, pfx, ifindex);
2669 scope = ipv6_addr_scope(pfx);
2671 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2672 if (addrconf_finite_timeout(timeout)) {
2673 expires = jiffies_to_clock_t(timeout * HZ);
2674 valid_lft = timeout;
2675 flags = RTF_EXPIRES;
2679 ifa_flags |= IFA_F_PERMANENT;
2682 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2683 if (addrconf_finite_timeout(timeout)) {
2685 ifa_flags |= IFA_F_DEPRECATED;
2686 prefered_lft = timeout;
2689 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2690 valid_lft, prefered_lft);
2693 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2694 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2699 * Note that section 3.1 of RFC 4429 indicates
2700 * that the Optimistic flag should not be set for
2701 * manually configured addresses
2703 addrconf_dad_start(ifp);
2704 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2705 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2708 addrconf_verify_rtnl();
2710 } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2711 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2712 false, pfx, ifindex);
2715 return PTR_ERR(ifp);
2718 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2719 const struct in6_addr *pfx, unsigned int plen)
2721 struct inet6_ifaddr *ifp;
2722 struct inet6_dev *idev;
2723 struct net_device *dev;
2728 dev = __dev_get_by_index(net, ifindex);
2732 idev = __in6_dev_get(dev);
2736 read_lock_bh(&idev->lock);
2737 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2738 if (ifp->prefix_len == plen &&
2739 ipv6_addr_equal(pfx, &ifp->addr)) {
2741 read_unlock_bh(&idev->lock);
2743 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2744 (ifa_flags & IFA_F_MANAGETEMPADDR))
2745 manage_tempaddrs(idev, ifp, 0, 0, false,
2748 addrconf_verify_rtnl();
2749 if (ipv6_addr_is_multicast(pfx)) {
2750 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2751 false, pfx, dev->ifindex);
2756 read_unlock_bh(&idev->lock);
2757 return -EADDRNOTAVAIL;
2761 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2763 struct in6_ifreq ireq;
2766 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2769 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2773 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2774 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2775 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2780 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2782 struct in6_ifreq ireq;
2785 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2788 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2792 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
2793 ireq.ifr6_prefixlen);
2798 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2799 int plen, int scope)
2801 struct inet6_ifaddr *ifp;
2803 ifp = ipv6_add_addr(idev, addr, NULL, plen,
2804 scope, IFA_F_PERMANENT,
2805 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2807 spin_lock_bh(&ifp->lock);
2808 ifp->flags &= ~IFA_F_TENTATIVE;
2809 spin_unlock_bh(&ifp->lock);
2810 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2815 #if IS_ENABLED(CONFIG_IPV6_SIT)
2816 static void sit_add_v4_addrs(struct inet6_dev *idev)
2818 struct in6_addr addr;
2819 struct net_device *dev;
2820 struct net *net = dev_net(idev->dev);
2826 memset(&addr, 0, sizeof(struct in6_addr));
2827 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2829 if (idev->dev->flags&IFF_POINTOPOINT) {
2830 addr.s6_addr32[0] = htonl(0xfe800000);
2834 scope = IPV6_ADDR_COMPATv4;
2836 pflags |= RTF_NONEXTHOP;
2839 if (addr.s6_addr32[3]) {
2840 add_addr(idev, &addr, plen, scope);
2841 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
2845 for_each_netdev(net, dev) {
2846 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2847 if (in_dev && (dev->flags & IFF_UP)) {
2848 struct in_ifaddr *ifa;
2852 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2854 addr.s6_addr32[3] = ifa->ifa_local;
2856 if (ifa->ifa_scope == RT_SCOPE_LINK)
2858 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2859 if (idev->dev->flags&IFF_POINTOPOINT)
2864 add_addr(idev, &addr, plen, flag);
2865 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2873 static void init_loopback(struct net_device *dev)
2875 struct inet6_dev *idev;
2876 struct net_device *sp_dev;
2877 struct inet6_ifaddr *sp_ifa;
2878 struct rt6_info *sp_rt;
2884 idev = ipv6_find_idev(dev);
2886 pr_debug("%s: add_dev failed\n", __func__);
2890 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2892 /* Add routes to other interface's IPv6 addresses */
2893 for_each_netdev(dev_net(dev), sp_dev) {
2894 if (!strcmp(sp_dev->name, dev->name))
2897 idev = __in6_dev_get(sp_dev);
2901 read_lock_bh(&idev->lock);
2902 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2904 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2908 /* This dst has been added to garbage list when
2909 * lo device down, release this obsolete dst and
2910 * reallocate a new router for ifa.
2912 if (sp_ifa->rt->dst.obsolete > 0) {
2913 ip6_rt_put(sp_ifa->rt);
2920 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
2922 /* Failure cases are ignored */
2923 if (!IS_ERR(sp_rt)) {
2928 read_unlock_bh(&idev->lock);
2932 static void addrconf_add_linklocal(struct inet6_dev *idev,
2933 const struct in6_addr *addr, u32 flags)
2935 struct inet6_ifaddr *ifp;
2936 u32 addr_flags = flags | IFA_F_PERMANENT;
2938 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2939 if (idev->cnf.optimistic_dad &&
2940 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2941 addr_flags |= IFA_F_OPTIMISTIC;
2944 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
2945 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2947 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2948 addrconf_dad_start(ifp);
2953 static bool ipv6_reserved_interfaceid(struct in6_addr address)
2955 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
2958 if (address.s6_addr32[2] == htonl(0x02005eff) &&
2959 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
2962 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
2963 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
2969 static int ipv6_generate_stable_address(struct in6_addr *address,
2971 const struct inet6_dev *idev)
2973 static DEFINE_SPINLOCK(lock);
2974 static __u32 digest[SHA_DIGEST_WORDS];
2975 static __u32 workspace[SHA_WORKSPACE_WORDS];
2978 char __data[SHA_MESSAGE_BYTES];
2980 struct in6_addr secret;
2982 unsigned char hwaddr[MAX_ADDR_LEN];
2987 struct in6_addr secret;
2988 struct in6_addr temp;
2989 struct net *net = dev_net(idev->dev);
2991 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
2993 if (idev->cnf.stable_secret.initialized)
2994 secret = idev->cnf.stable_secret.secret;
2995 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
2996 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3001 spin_lock_bh(&lock);
3004 memset(&data, 0, sizeof(data));
3005 memset(workspace, 0, sizeof(workspace));
3006 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3007 data.prefix[0] = address->s6_addr32[0];
3008 data.prefix[1] = address->s6_addr32[1];
3009 data.secret = secret;
3010 data.dad_count = dad_count;
3012 sha_transform(digest, data.__data, workspace);
3015 temp.s6_addr32[2] = (__force __be32)digest[0];
3016 temp.s6_addr32[3] = (__force __be32)digest[1];
3018 spin_unlock_bh(&lock);
3020 if (ipv6_reserved_interfaceid(temp)) {
3022 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3031 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3033 struct in6_addr addr;
3035 /* no link local addresses on L3 master devices */
3036 if (netif_is_l3_master(idev->dev))
3039 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3041 if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY) {
3042 if (!ipv6_generate_stable_address(&addr, 0, idev))
3043 addrconf_add_linklocal(idev, &addr,
3044 IFA_F_STABLE_PRIVACY);
3045 else if (prefix_route)
3046 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3047 } else if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) {
3048 /* addrconf_add_linklocal also adds a prefix_route and we
3049 * only need to care about prefix routes if ipv6_generate_eui64
3050 * couldn't generate one.
3052 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3053 addrconf_add_linklocal(idev, &addr, 0);
3054 else if (prefix_route)
3055 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3059 static void addrconf_dev_config(struct net_device *dev)
3061 struct inet6_dev *idev;
3065 if ((dev->type != ARPHRD_ETHER) &&
3066 (dev->type != ARPHRD_FDDI) &&
3067 (dev->type != ARPHRD_ARCNET) &&
3068 (dev->type != ARPHRD_INFINIBAND) &&
3069 (dev->type != ARPHRD_IEEE802154) &&
3070 (dev->type != ARPHRD_IEEE1394) &&
3071 (dev->type != ARPHRD_TUNNEL6) &&
3072 (dev->type != ARPHRD_6LOWPAN)) {
3073 /* Alas, we support only Ethernet autoconfiguration. */
3077 idev = addrconf_add_dev(dev);
3081 addrconf_addr_gen(idev, false);
3084 #if IS_ENABLED(CONFIG_IPV6_SIT)
3085 static void addrconf_sit_config(struct net_device *dev)
3087 struct inet6_dev *idev;
3092 * Configure the tunnel with one of our IPv4
3093 * addresses... we should configure all of
3094 * our v4 addrs in the tunnel
3097 idev = ipv6_find_idev(dev);
3099 pr_debug("%s: add_dev failed\n", __func__);
3103 if (dev->priv_flags & IFF_ISATAP) {
3104 addrconf_addr_gen(idev, false);
3108 sit_add_v4_addrs(idev);
3110 if (dev->flags&IFF_POINTOPOINT)
3111 addrconf_add_mroute(dev);
3115 #if IS_ENABLED(CONFIG_NET_IPGRE)
3116 static void addrconf_gre_config(struct net_device *dev)
3118 struct inet6_dev *idev;
3122 idev = ipv6_find_idev(dev);
3124 pr_debug("%s: add_dev failed\n", __func__);
3128 addrconf_addr_gen(idev, true);
3129 if (dev->flags & IFF_POINTOPOINT)
3130 addrconf_add_mroute(dev);
3134 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3137 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3138 struct inet6_dev *idev = __in6_dev_get(dev);
3139 int run_pending = 0;
3143 case NETDEV_REGISTER:
3144 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3145 idev = ipv6_add_dev(dev);
3147 return notifier_from_errno(PTR_ERR(idev));
3151 case NETDEV_CHANGEMTU:
3152 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3153 if (dev->mtu < IPV6_MIN_MTU) {
3154 addrconf_ifdown(dev, 1);
3159 rt6_mtu_change(dev, dev->mtu);
3160 idev->cnf.mtu6 = dev->mtu;
3164 /* allocate new idev */
3165 idev = ipv6_add_dev(dev);
3169 /* device is still not ready */
3170 if (!(idev->if_flags & IF_READY))
3179 if (dev->flags & IFF_SLAVE)
3182 if (idev && idev->cnf.disable_ipv6)
3185 if (event == NETDEV_UP) {
3186 if (!addrconf_qdisc_ok(dev)) {
3187 /* device is not ready yet. */
3188 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3193 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3194 idev = ipv6_add_dev(dev);
3196 if (!IS_ERR_OR_NULL(idev)) {
3197 idev->if_flags |= IF_READY;
3200 } else if (event == NETDEV_CHANGE) {
3201 if (!addrconf_qdisc_ok(dev)) {
3202 /* device is still not ready. */
3207 if (idev->if_flags & IF_READY)
3208 /* device is already configured. */
3210 idev->if_flags |= IF_READY;
3213 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3219 switch (dev->type) {
3220 #if IS_ENABLED(CONFIG_IPV6_SIT)
3222 addrconf_sit_config(dev);
3225 #if IS_ENABLED(CONFIG_NET_IPGRE)
3227 addrconf_gre_config(dev);
3230 case ARPHRD_LOOPBACK:
3235 addrconf_dev_config(dev);
3239 if (!IS_ERR_OR_NULL(idev)) {
3241 addrconf_dad_run(idev);
3244 * If the MTU changed during the interface down,
3245 * when the interface up, the changed MTU must be
3246 * reflected in the idev as well as routers.
3248 if (idev->cnf.mtu6 != dev->mtu &&
3249 dev->mtu >= IPV6_MIN_MTU) {
3250 rt6_mtu_change(dev, dev->mtu);
3251 idev->cnf.mtu6 = dev->mtu;
3253 idev->tstamp = jiffies;
3254 inet6_ifinfo_notify(RTM_NEWLINK, idev);
3257 * If the changed mtu during down is lower than
3258 * IPV6_MIN_MTU stop IPv6 on this interface.
3260 if (dev->mtu < IPV6_MIN_MTU)
3261 addrconf_ifdown(dev, 1);
3266 case NETDEV_UNREGISTER:
3268 * Remove all addresses from this interface.
3270 addrconf_ifdown(dev, event != NETDEV_DOWN);
3273 case NETDEV_CHANGENAME:
3275 snmp6_unregister_dev(idev);
3276 addrconf_sysctl_unregister(idev);
3277 err = addrconf_sysctl_register(idev);
3279 return notifier_from_errno(err);
3280 err = snmp6_register_dev(idev);
3282 addrconf_sysctl_unregister(idev);
3283 return notifier_from_errno(err);
3288 case NETDEV_PRE_TYPE_CHANGE:
3289 case NETDEV_POST_TYPE_CHANGE:
3291 addrconf_type_change(dev, event);
3299 * addrconf module should be notified of a device going up
3301 static struct notifier_block ipv6_dev_notf = {
3302 .notifier_call = addrconf_notify,
3305 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3307 struct inet6_dev *idev;
3310 idev = __in6_dev_get(dev);
3312 if (event == NETDEV_POST_TYPE_CHANGE)
3313 ipv6_mc_remap(idev);
3314 else if (event == NETDEV_PRE_TYPE_CHANGE)
3315 ipv6_mc_unmap(idev);
3318 static int addrconf_ifdown(struct net_device *dev, int how)
3320 struct net *net = dev_net(dev);
3321 struct inet6_dev *idev;
3322 struct inet6_ifaddr *ifa;
3327 rt6_ifdown(net, dev);
3328 neigh_ifdown(&nd_tbl, dev);
3330 idev = __in6_dev_get(dev);
3335 * Step 1: remove reference to ipv6 device from parent device.
3341 /* protected by rtnl_lock */
3342 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3344 /* Step 1.5: remove snmp6 entry */
3345 snmp6_unregister_dev(idev);
3349 /* Step 2: clear hash table */
3350 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3351 struct hlist_head *h = &inet6_addr_lst[i];
3353 spin_lock_bh(&addrconf_hash_lock);
3355 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3356 if (ifa->idev == idev) {
3357 hlist_del_init_rcu(&ifa->addr_lst);
3358 addrconf_del_dad_work(ifa);
3362 spin_unlock_bh(&addrconf_hash_lock);
3365 write_lock_bh(&idev->lock);
3367 addrconf_del_rs_timer(idev);
3369 /* Step 2: clear flags for stateless addrconf */
3371 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3373 if (how && del_timer(&idev->regen_timer))
3376 /* Step 3: clear tempaddr list */
3377 while (!list_empty(&idev->tempaddr_list)) {
3378 ifa = list_first_entry(&idev->tempaddr_list,
3379 struct inet6_ifaddr, tmp_list);
3380 list_del(&ifa->tmp_list);
3381 write_unlock_bh(&idev->lock);
3382 spin_lock_bh(&ifa->lock);
3385 in6_ifa_put(ifa->ifpub);
3388 spin_unlock_bh(&ifa->lock);
3390 write_lock_bh(&idev->lock);
3393 while (!list_empty(&idev->addr_list)) {
3394 ifa = list_first_entry(&idev->addr_list,
3395 struct inet6_ifaddr, if_list);
3396 addrconf_del_dad_work(ifa);
3398 list_del(&ifa->if_list);
3400 write_unlock_bh(&idev->lock);
3402 spin_lock_bh(&ifa->lock);
3404 ifa->state = INET6_IFADDR_STATE_DEAD;
3405 spin_unlock_bh(&ifa->lock);
3407 if (state != INET6_IFADDR_STATE_DEAD) {
3408 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3409 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3413 write_lock_bh(&idev->lock);
3416 write_unlock_bh(&idev->lock);
3418 /* Step 5: Discard anycast and multicast list */
3420 ipv6_ac_destroy_dev(idev);
3421 ipv6_mc_destroy_dev(idev);
3426 idev->tstamp = jiffies;
3428 /* Last: Shot the device (if unregistered) */
3430 addrconf_sysctl_unregister(idev);
3431 neigh_parms_release(&nd_tbl, idev->nd_parms);
3432 neigh_ifdown(&nd_tbl, dev);
3438 static void addrconf_rs_timer(unsigned long data)
3440 struct inet6_dev *idev = (struct inet6_dev *)data;
3441 struct net_device *dev = idev->dev;
3442 struct in6_addr lladdr;
3444 write_lock(&idev->lock);
3445 if (idev->dead || !(idev->if_flags & IF_READY))
3448 if (!ipv6_accept_ra(idev))
3451 /* Announcement received after solicitation was sent */
3452 if (idev->if_flags & IF_RA_RCVD)
3455 if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
3456 write_unlock(&idev->lock);
3457 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3458 ndisc_send_rs(dev, &lladdr,
3459 &in6addr_linklocal_allrouters);
3463 write_lock(&idev->lock);
3464 /* The wait after the last probe can be shorter */
3465 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3466 idev->cnf.rtr_solicits) ?
3467 idev->cnf.rtr_solicit_delay :
3468 idev->cnf.rtr_solicit_interval);
3471 * Note: we do not support deprecated "all on-link"
3472 * assumption any longer.
3474 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3478 write_unlock(&idev->lock);
3484 * Duplicate Address Detection
3486 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3488 unsigned long rand_num;
3489 struct inet6_dev *idev = ifp->idev;
3491 if (ifp->flags & IFA_F_OPTIMISTIC)
3494 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3496 ifp->dad_probes = idev->cnf.dad_transmits;
3497 addrconf_mod_dad_work(ifp, rand_num);
3500 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3502 struct inet6_dev *idev = ifp->idev;
3503 struct net_device *dev = idev->dev;
3505 addrconf_join_solict(dev, &ifp->addr);
3507 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3509 read_lock_bh(&idev->lock);
3510 spin_lock(&ifp->lock);
3511 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3514 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3515 idev->cnf.accept_dad < 1 ||
3516 !(ifp->flags&IFA_F_TENTATIVE) ||
3517 ifp->flags & IFA_F_NODAD) {
3518 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3519 spin_unlock(&ifp->lock);
3520 read_unlock_bh(&idev->lock);
3522 addrconf_dad_completed(ifp);
3526 if (!(idev->if_flags & IF_READY)) {
3527 spin_unlock(&ifp->lock);
3528 read_unlock_bh(&idev->lock);
3530 * If the device is not ready:
3531 * - keep it tentative if it is a permanent address.
3532 * - otherwise, kill it.
3535 addrconf_dad_stop(ifp, 0);
3540 * Optimistic nodes can start receiving
3543 if (ifp->flags & IFA_F_OPTIMISTIC) {
3544 ip6_ins_rt(ifp->rt);
3545 if (ipv6_use_optimistic_addr(idev)) {
3546 /* Because optimistic nodes can use this address,
3547 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3549 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3553 addrconf_dad_kick(ifp);
3555 spin_unlock(&ifp->lock);
3556 read_unlock_bh(&idev->lock);
3559 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3561 bool begin_dad = false;
3563 spin_lock_bh(&ifp->lock);
3564 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3565 ifp->state = INET6_IFADDR_STATE_PREDAD;
3568 spin_unlock_bh(&ifp->lock);
3571 addrconf_mod_dad_work(ifp, 0);
3574 static void addrconf_dad_work(struct work_struct *w)
3576 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3577 struct inet6_ifaddr,
3579 struct inet6_dev *idev = ifp->idev;
3580 struct in6_addr mcaddr;
3586 } action = DAD_PROCESS;
3590 spin_lock_bh(&ifp->lock);
3591 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3593 ifp->state = INET6_IFADDR_STATE_DAD;
3594 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3596 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3598 spin_unlock_bh(&ifp->lock);
3600 if (action == DAD_BEGIN) {
3601 addrconf_dad_begin(ifp);
3603 } else if (action == DAD_ABORT) {
3604 addrconf_dad_stop(ifp, 1);
3608 if (!ifp->dad_probes && addrconf_dad_end(ifp))
3611 write_lock_bh(&idev->lock);
3612 if (idev->dead || !(idev->if_flags & IF_READY)) {
3613 write_unlock_bh(&idev->lock);
3617 spin_lock(&ifp->lock);
3618 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3619 spin_unlock(&ifp->lock);
3620 write_unlock_bh(&idev->lock);
3624 if (ifp->dad_probes == 0) {
3626 * DAD was successful
3629 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3630 spin_unlock(&ifp->lock);
3631 write_unlock_bh(&idev->lock);
3633 addrconf_dad_completed(ifp);
3639 addrconf_mod_dad_work(ifp,
3640 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
3641 spin_unlock(&ifp->lock);
3642 write_unlock_bh(&idev->lock);
3644 /* send a neighbour solicitation for our addr */
3645 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3646 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any);
3652 /* ifp->idev must be at least read locked */
3653 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3655 struct inet6_ifaddr *ifpiter;
3656 struct inet6_dev *idev = ifp->idev;
3658 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3659 if (ifpiter->scope > IFA_LINK)
3661 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3662 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3663 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3670 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3672 struct net_device *dev = ifp->idev->dev;
3673 struct in6_addr lladdr;
3674 bool send_rs, send_mld;
3676 addrconf_del_dad_work(ifp);
3679 * Configure the address for reception. Now it is valid.
3682 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3684 /* If added prefix is link local and we are prepared to process
3685 router advertisements, start sending router solicitations.
3688 read_lock_bh(&ifp->idev->lock);
3689 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
3690 send_rs = send_mld &&
3691 ipv6_accept_ra(ifp->idev) &&
3692 ifp->idev->cnf.rtr_solicits > 0 &&
3693 (dev->flags&IFF_LOOPBACK) == 0;
3694 read_unlock_bh(&ifp->idev->lock);
3696 /* While dad is in progress mld report's source address is in6_addrany.
3697 * Resend with proper ll now.
3700 ipv6_mc_dad_complete(ifp->idev);
3704 * If a host as already performed a random delay
3705 * [...] as part of DAD [...] there is no need
3706 * to delay again before sending the first RS
3708 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3710 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
3712 write_lock_bh(&ifp->idev->lock);
3713 spin_lock(&ifp->lock);
3714 ifp->idev->rs_probes = 1;
3715 ifp->idev->if_flags |= IF_RS_SENT;
3716 addrconf_mod_rs_timer(ifp->idev,
3717 ifp->idev->cnf.rtr_solicit_interval);
3718 spin_unlock(&ifp->lock);
3719 write_unlock_bh(&ifp->idev->lock);
3723 static void addrconf_dad_run(struct inet6_dev *idev)
3725 struct inet6_ifaddr *ifp;
3727 read_lock_bh(&idev->lock);
3728 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3729 spin_lock(&ifp->lock);
3730 if (ifp->flags & IFA_F_TENTATIVE &&
3731 ifp->state == INET6_IFADDR_STATE_DAD)
3732 addrconf_dad_kick(ifp);
3733 spin_unlock(&ifp->lock);
3735 read_unlock_bh(&idev->lock);
3738 #ifdef CONFIG_PROC_FS
3739 struct if6_iter_state {
3740 struct seq_net_private p;
3745 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3747 struct inet6_ifaddr *ifa = NULL;
3748 struct if6_iter_state *state = seq->private;
3749 struct net *net = seq_file_net(seq);
3752 /* initial bucket if pos is 0 */
3758 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3759 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
3761 if (!net_eq(dev_net(ifa->idev->dev), net))
3763 /* sync with offset */
3764 if (p < state->offset) {
3772 /* prepare for next bucket */
3779 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3780 struct inet6_ifaddr *ifa)
3782 struct if6_iter_state *state = seq->private;
3783 struct net *net = seq_file_net(seq);
3785 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
3786 if (!net_eq(dev_net(ifa->idev->dev), net))
3792 while (++state->bucket < IN6_ADDR_HSIZE) {
3794 hlist_for_each_entry_rcu_bh(ifa,
3795 &inet6_addr_lst[state->bucket], addr_lst) {
3796 if (!net_eq(dev_net(ifa->idev->dev), net))
3806 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3810 return if6_get_first(seq, *pos);
3813 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3815 struct inet6_ifaddr *ifa;
3817 ifa = if6_get_next(seq, v);
3822 static void if6_seq_stop(struct seq_file *seq, void *v)
3825 rcu_read_unlock_bh();
3828 static int if6_seq_show(struct seq_file *seq, void *v)
3830 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3831 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3833 ifp->idev->dev->ifindex,
3837 ifp->idev->dev->name);
3841 static const struct seq_operations if6_seq_ops = {
3842 .start = if6_seq_start,
3843 .next = if6_seq_next,
3844 .show = if6_seq_show,
3845 .stop = if6_seq_stop,
3848 static int if6_seq_open(struct inode *inode, struct file *file)
3850 return seq_open_net(inode, file, &if6_seq_ops,
3851 sizeof(struct if6_iter_state));
3854 static const struct file_operations if6_fops = {
3855 .owner = THIS_MODULE,
3856 .open = if6_seq_open,
3858 .llseek = seq_lseek,
3859 .release = seq_release_net,
3862 static int __net_init if6_proc_net_init(struct net *net)
3864 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
3869 static void __net_exit if6_proc_net_exit(struct net *net)
3871 remove_proc_entry("if_inet6", net->proc_net);
3874 static struct pernet_operations if6_proc_net_ops = {
3875 .init = if6_proc_net_init,
3876 .exit = if6_proc_net_exit,
3879 int __init if6_proc_init(void)
3881 return register_pernet_subsys(&if6_proc_net_ops);
3884 void if6_proc_exit(void)
3886 unregister_pernet_subsys(&if6_proc_net_ops);
3888 #endif /* CONFIG_PROC_FS */
3890 #if IS_ENABLED(CONFIG_IPV6_MIP6)
3891 /* Check if address is a home address configured on any interface. */
3892 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3895 struct inet6_ifaddr *ifp = NULL;
3896 unsigned int hash = inet6_addr_hash(addr);
3899 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
3900 if (!net_eq(dev_net(ifp->idev->dev), net))
3902 if (ipv6_addr_equal(&ifp->addr, addr) &&
3903 (ifp->flags & IFA_F_HOMEADDRESS)) {
3908 rcu_read_unlock_bh();
3914 * Periodic address status verification
3917 static void addrconf_verify_rtnl(void)
3919 unsigned long now, next, next_sec, next_sched;
3920 struct inet6_ifaddr *ifp;
3927 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3929 cancel_delayed_work(&addr_chk_work);
3931 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3933 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
3936 /* When setting preferred_lft to a value not zero or
3937 * infinity, while valid_lft is infinity
3938 * IFA_F_PERMANENT has a non-infinity life time.
3940 if ((ifp->flags & IFA_F_PERMANENT) &&
3941 (ifp->prefered_lft == INFINITY_LIFE_TIME))
3944 spin_lock(&ifp->lock);
3945 /* We try to batch several events at once. */
3946 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3948 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3949 age >= ifp->valid_lft) {
3950 spin_unlock(&ifp->lock);
3954 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3955 spin_unlock(&ifp->lock);
3957 } else if (age >= ifp->prefered_lft) {
3958 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3961 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3963 ifp->flags |= IFA_F_DEPRECATED;
3966 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
3967 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
3968 next = ifp->tstamp + ifp->valid_lft * HZ;
3970 spin_unlock(&ifp->lock);
3975 ipv6_ifa_notify(0, ifp);
3979 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3980 !(ifp->flags&IFA_F_TENTATIVE)) {
3981 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3982 ifp->idev->cnf.dad_transmits *
3983 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
3985 if (age >= ifp->prefered_lft - regen_advance) {
3986 struct inet6_ifaddr *ifpub = ifp->ifpub;
3987 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3988 next = ifp->tstamp + ifp->prefered_lft * HZ;
3989 if (!ifp->regen_count && ifpub) {
3992 in6_ifa_hold(ifpub);
3993 spin_unlock(&ifp->lock);
3995 spin_lock(&ifpub->lock);
3996 ifpub->regen_count = 0;
3997 spin_unlock(&ifpub->lock);
3998 ipv6_create_tempaddr(ifpub, ifp);
4003 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4004 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4005 spin_unlock(&ifp->lock);
4007 /* ifp->prefered_lft <= ifp->valid_lft */
4008 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4009 next = ifp->tstamp + ifp->prefered_lft * HZ;
4010 spin_unlock(&ifp->lock);
4015 next_sec = round_jiffies_up(next);
4018 /* If rounded timeout is accurate enough, accept it. */
4019 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4020 next_sched = next_sec;
4022 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4023 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4024 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4026 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4027 now, next, next_sec, next_sched);
4028 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
4029 rcu_read_unlock_bh();
4032 static void addrconf_verify_work(struct work_struct *w)
4035 addrconf_verify_rtnl();
4039 static void addrconf_verify(void)
4041 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4044 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4045 struct in6_addr **peer_pfx)
4047 struct in6_addr *pfx = NULL;
4052 pfx = nla_data(addr);
4055 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4057 pfx = nla_data(local);
4063 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4064 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4065 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4066 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
4067 [IFA_FLAGS] = { .len = sizeof(u32) },
4071 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
4073 struct net *net = sock_net(skb->sk);
4074 struct ifaddrmsg *ifm;
4075 struct nlattr *tb[IFA_MAX+1];
4076 struct in6_addr *pfx, *peer_pfx;
4080 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4084 ifm = nlmsg_data(nlh);
4085 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4089 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4091 /* We ignore other flags so far. */
4092 ifa_flags &= IFA_F_MANAGETEMPADDR;
4094 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4095 ifm->ifa_prefixlen);
4098 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
4099 u32 prefered_lft, u32 valid_lft)
4103 unsigned long timeout;
4104 bool was_managetempaddr;
4105 bool had_prefixroute;
4109 if (!valid_lft || (prefered_lft > valid_lft))
4112 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4113 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4116 timeout = addrconf_timeout_fixup(valid_lft, HZ);
4117 if (addrconf_finite_timeout(timeout)) {
4118 expires = jiffies_to_clock_t(timeout * HZ);
4119 valid_lft = timeout;
4120 flags = RTF_EXPIRES;
4124 ifa_flags |= IFA_F_PERMANENT;
4127 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4128 if (addrconf_finite_timeout(timeout)) {
4130 ifa_flags |= IFA_F_DEPRECATED;
4131 prefered_lft = timeout;
4134 spin_lock_bh(&ifp->lock);
4135 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4136 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4137 !(ifp->flags & IFA_F_NOPREFIXROUTE);
4138 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4139 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4140 IFA_F_NOPREFIXROUTE);
4141 ifp->flags |= ifa_flags;
4142 ifp->tstamp = jiffies;
4143 ifp->valid_lft = valid_lft;
4144 ifp->prefered_lft = prefered_lft;
4146 spin_unlock_bh(&ifp->lock);
4147 if (!(ifp->flags&IFA_F_TENTATIVE))
4148 ipv6_ifa_notify(0, ifp);
4150 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4151 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4153 } else if (had_prefixroute) {
4154 enum cleanup_prefix_rt_t action;
4155 unsigned long rt_expires;
4157 write_lock_bh(&ifp->idev->lock);
4158 action = check_cleanup_prefix_route(ifp, &rt_expires);
4159 write_unlock_bh(&ifp->idev->lock);
4161 if (action != CLEANUP_PREFIX_RT_NOP) {
4162 cleanup_prefix_route(ifp, rt_expires,
4163 action == CLEANUP_PREFIX_RT_DEL);
4167 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4168 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4169 valid_lft = prefered_lft = 0;
4170 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4171 !was_managetempaddr, jiffies);
4174 addrconf_verify_rtnl();
4180 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
4182 struct net *net = sock_net(skb->sk);
4183 struct ifaddrmsg *ifm;
4184 struct nlattr *tb[IFA_MAX+1];
4185 struct in6_addr *pfx, *peer_pfx;
4186 struct inet6_ifaddr *ifa;
4187 struct net_device *dev;
4188 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
4192 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4196 ifm = nlmsg_data(nlh);
4197 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4201 if (tb[IFA_CACHEINFO]) {
4202 struct ifa_cacheinfo *ci;
4204 ci = nla_data(tb[IFA_CACHEINFO]);
4205 valid_lft = ci->ifa_valid;
4206 preferred_lft = ci->ifa_prefered;
4208 preferred_lft = INFINITY_LIFE_TIME;
4209 valid_lft = INFINITY_LIFE_TIME;
4212 dev = __dev_get_by_index(net, ifm->ifa_index);
4216 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4218 /* We ignore other flags so far. */
4219 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4220 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
4222 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
4225 * It would be best to check for !NLM_F_CREATE here but
4226 * userspace already relies on not having to provide this.
4228 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
4229 ifm->ifa_prefixlen, ifa_flags,
4230 preferred_lft, valid_lft);
4233 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4234 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4237 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
4244 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4245 u8 scope, int ifindex)
4247 struct ifaddrmsg *ifm;
4249 ifm = nlmsg_data(nlh);
4250 ifm->ifa_family = AF_INET6;
4251 ifm->ifa_prefixlen = prefixlen;
4252 ifm->ifa_flags = flags;
4253 ifm->ifa_scope = scope;
4254 ifm->ifa_index = ifindex;
4257 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4258 unsigned long tstamp, u32 preferred, u32 valid)
4260 struct ifa_cacheinfo ci;
4262 ci.cstamp = cstamp_delta(cstamp);
4263 ci.tstamp = cstamp_delta(tstamp);
4264 ci.ifa_prefered = preferred;
4265 ci.ifa_valid = valid;
4267 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4270 static inline int rt_scope(int ifa_scope)
4272 if (ifa_scope & IFA_HOST)
4273 return RT_SCOPE_HOST;
4274 else if (ifa_scope & IFA_LINK)
4275 return RT_SCOPE_LINK;
4276 else if (ifa_scope & IFA_SITE)
4277 return RT_SCOPE_SITE;
4279 return RT_SCOPE_UNIVERSE;
4282 static inline int inet6_ifaddr_msgsize(void)
4284 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4285 + nla_total_size(16) /* IFA_LOCAL */
4286 + nla_total_size(16) /* IFA_ADDRESS */
4287 + nla_total_size(sizeof(struct ifa_cacheinfo))
4288 + nla_total_size(4) /* IFA_FLAGS */;
4291 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
4292 u32 portid, u32 seq, int event, unsigned int flags)
4294 struct nlmsghdr *nlh;
4295 u32 preferred, valid;
4297 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4301 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4302 ifa->idev->dev->ifindex);
4304 if (!((ifa->flags&IFA_F_PERMANENT) &&
4305 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
4306 preferred = ifa->prefered_lft;
4307 valid = ifa->valid_lft;
4308 if (preferred != INFINITY_LIFE_TIME) {
4309 long tval = (jiffies - ifa->tstamp)/HZ;
4310 if (preferred > tval)
4314 if (valid != INFINITY_LIFE_TIME) {
4322 preferred = INFINITY_LIFE_TIME;
4323 valid = INFINITY_LIFE_TIME;
4326 if (!ipv6_addr_any(&ifa->peer_addr)) {
4327 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4328 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
4331 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
4334 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4337 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4340 nlmsg_end(skb, nlh);
4344 nlmsg_cancel(skb, nlh);
4348 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
4349 u32 portid, u32 seq, int event, u16 flags)
4351 struct nlmsghdr *nlh;
4352 u8 scope = RT_SCOPE_UNIVERSE;
4353 int ifindex = ifmca->idev->dev->ifindex;
4355 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4356 scope = RT_SCOPE_SITE;
4358 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4362 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4363 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
4364 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
4365 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4366 nlmsg_cancel(skb, nlh);
4370 nlmsg_end(skb, nlh);
4374 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
4375 u32 portid, u32 seq, int event, unsigned int flags)
4377 struct nlmsghdr *nlh;
4378 u8 scope = RT_SCOPE_UNIVERSE;
4379 int ifindex = ifaca->aca_idev->dev->ifindex;
4381 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4382 scope = RT_SCOPE_SITE;
4384 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4388 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4389 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
4390 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
4391 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4392 nlmsg_cancel(skb, nlh);
4396 nlmsg_end(skb, nlh);
4406 /* called with rcu_read_lock() */
4407 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4408 struct netlink_callback *cb, enum addr_type_t type,
4409 int s_ip_idx, int *p_ip_idx)
4411 struct ifmcaddr6 *ifmca;
4412 struct ifacaddr6 *ifaca;
4414 int ip_idx = *p_ip_idx;
4416 read_lock_bh(&idev->lock);
4418 case UNICAST_ADDR: {
4419 struct inet6_ifaddr *ifa;
4421 /* unicast address incl. temp addr */
4422 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4423 if (++ip_idx < s_ip_idx)
4425 err = inet6_fill_ifaddr(skb, ifa,
4426 NETLINK_CB(cb->skb).portid,
4432 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4436 case MULTICAST_ADDR:
4437 /* multicast address */
4438 for (ifmca = idev->mc_list; ifmca;
4439 ifmca = ifmca->next, ip_idx++) {
4440 if (ip_idx < s_ip_idx)
4442 err = inet6_fill_ifmcaddr(skb, ifmca,
4443 NETLINK_CB(cb->skb).portid,
4452 /* anycast address */
4453 for (ifaca = idev->ac_list; ifaca;
4454 ifaca = ifaca->aca_next, ip_idx++) {
4455 if (ip_idx < s_ip_idx)
4457 err = inet6_fill_ifacaddr(skb, ifaca,
4458 NETLINK_CB(cb->skb).portid,
4469 read_unlock_bh(&idev->lock);
4474 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4475 enum addr_type_t type)
4477 struct net *net = sock_net(skb->sk);
4480 int s_idx, s_ip_idx;
4481 struct net_device *dev;
4482 struct inet6_dev *idev;
4483 struct hlist_head *head;
4486 s_idx = idx = cb->args[1];
4487 s_ip_idx = ip_idx = cb->args[2];
4490 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4491 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4493 head = &net->dev_index_head[h];
4494 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4497 if (h > s_h || idx > s_idx)
4500 idev = __in6_dev_get(dev);
4504 if (in6_dump_addrs(idev, skb, cb, type,
4505 s_ip_idx, &ip_idx) < 0)
4515 cb->args[2] = ip_idx;
4520 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4522 enum addr_type_t type = UNICAST_ADDR;
4524 return inet6_dump_addr(skb, cb, type);
4527 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4529 enum addr_type_t type = MULTICAST_ADDR;
4531 return inet6_dump_addr(skb, cb, type);
4535 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4537 enum addr_type_t type = ANYCAST_ADDR;
4539 return inet6_dump_addr(skb, cb, type);
4542 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
4544 struct net *net = sock_net(in_skb->sk);
4545 struct ifaddrmsg *ifm;
4546 struct nlattr *tb[IFA_MAX+1];
4547 struct in6_addr *addr = NULL, *peer;
4548 struct net_device *dev = NULL;
4549 struct inet6_ifaddr *ifa;
4550 struct sk_buff *skb;
4553 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4557 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4563 ifm = nlmsg_data(nlh);
4565 dev = __dev_get_by_index(net, ifm->ifa_index);
4567 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4569 err = -EADDRNOTAVAIL;
4573 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4579 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4580 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4582 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4583 WARN_ON(err == -EMSGSIZE);
4587 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4594 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4596 struct sk_buff *skb;
4597 struct net *net = dev_net(ifa->idev->dev);
4600 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4604 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4606 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4607 WARN_ON(err == -EMSGSIZE);
4611 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4615 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4618 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4619 __s32 *array, int bytes)
4621 BUG_ON(bytes < (DEVCONF_MAX * 4));
4623 memset(array, 0, bytes);
4624 array[DEVCONF_FORWARDING] = cnf->forwarding;
4625 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4626 array[DEVCONF_MTU6] = cnf->mtu6;
4627 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4628 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4629 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4630 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4631 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4632 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4633 jiffies_to_msecs(cnf->rtr_solicit_interval);
4634 array[DEVCONF_RTR_SOLICIT_DELAY] =
4635 jiffies_to_msecs(cnf->rtr_solicit_delay);
4636 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4637 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4638 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4639 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4640 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
4641 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4642 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4643 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4644 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4645 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4646 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4647 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4648 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
4649 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4650 #ifdef CONFIG_IPV6_ROUTER_PREF
4651 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4652 array[DEVCONF_RTR_PROBE_INTERVAL] =
4653 jiffies_to_msecs(cnf->rtr_probe_interval);
4654 #ifdef CONFIG_IPV6_ROUTE_INFO
4655 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4658 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4659 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4660 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4661 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4662 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
4664 #ifdef CONFIG_IPV6_MROUTE
4665 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4667 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4668 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4669 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4670 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4671 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
4672 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
4673 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
4674 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
4675 /* we omit DEVCONF_STABLE_SECRET for now */
4676 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
4679 static inline size_t inet6_ifla6_size(void)
4681 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4682 + nla_total_size(sizeof(struct ifla_cacheinfo))
4683 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4684 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4685 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4686 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
4689 static inline size_t inet6_if_nlmsg_size(void)
4691 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4692 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4693 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4694 + nla_total_size(4) /* IFLA_MTU */
4695 + nla_total_size(4) /* IFLA_LINK */
4696 + nla_total_size(1) /* IFLA_OPERSTATE */
4697 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4700 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4701 int items, int bytes)
4704 int pad = bytes - sizeof(u64) * items;
4707 /* Use put_unaligned() because stats may not be aligned for u64. */
4708 put_unaligned(items, &stats[0]);
4709 for (i = 1; i < items; i++)
4710 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4712 memset(&stats[items], 0, pad);
4715 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
4716 int bytes, size_t syncpoff)
4719 u64 buff[IPSTATS_MIB_MAX];
4720 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
4724 memset(buff, 0, sizeof(buff));
4725 buff[0] = IPSTATS_MIB_MAX;
4727 for_each_possible_cpu(c) {
4728 for (i = 1; i < IPSTATS_MIB_MAX; i++)
4729 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
4732 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
4733 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
4736 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4740 case IFLA_INET6_STATS:
4741 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
4742 offsetof(struct ipstats_mib, syncp));
4744 case IFLA_INET6_ICMP6STATS:
4745 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
4750 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
4751 u32 ext_filter_mask)
4754 struct ifla_cacheinfo ci;
4756 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4757 goto nla_put_failure;
4758 ci.max_reasm_len = IPV6_MAXPLEN;
4759 ci.tstamp = cstamp_delta(idev->tstamp);
4760 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4761 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
4762 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4763 goto nla_put_failure;
4764 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4766 goto nla_put_failure;
4767 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4769 /* XXX - MC not implemented */
4771 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
4774 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4776 goto nla_put_failure;
4777 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4779 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4781 goto nla_put_failure;
4782 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4784 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4786 goto nla_put_failure;
4788 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode))
4789 goto nla_put_failure;
4791 read_lock_bh(&idev->lock);
4792 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4793 read_unlock_bh(&idev->lock);
4801 static size_t inet6_get_link_af_size(const struct net_device *dev,
4802 u32 ext_filter_mask)
4804 if (!__in6_dev_get(dev))
4807 return inet6_ifla6_size();
4810 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
4811 u32 ext_filter_mask)
4813 struct inet6_dev *idev = __in6_dev_get(dev);
4818 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
4824 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4826 struct inet6_ifaddr *ifp;
4827 struct net_device *dev = idev->dev;
4828 bool update_rs = false;
4829 struct in6_addr ll_addr;
4835 if (ipv6_addr_any(token))
4837 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4839 if (!ipv6_accept_ra(idev))
4841 if (idev->cnf.rtr_solicits <= 0)
4844 write_lock_bh(&idev->lock);
4846 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4847 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4849 write_unlock_bh(&idev->lock);
4851 if (!idev->dead && (idev->if_flags & IF_READY) &&
4852 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4853 IFA_F_OPTIMISTIC)) {
4855 /* If we're not ready, then normal ifup will take care
4856 * of this. Otherwise, we need to request our rs here.
4858 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4862 write_lock_bh(&idev->lock);
4865 idev->if_flags |= IF_RS_SENT;
4866 idev->rs_probes = 1;
4867 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
4870 /* Well, that's kinda nasty ... */
4871 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4872 spin_lock(&ifp->lock);
4873 if (ifp->tokenized) {
4875 ifp->prefered_lft = 0;
4877 spin_unlock(&ifp->lock);
4880 write_unlock_bh(&idev->lock);
4881 inet6_ifinfo_notify(RTM_NEWLINK, idev);
4882 addrconf_verify_rtnl();
4886 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
4887 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
4888 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
4891 static int inet6_validate_link_af(const struct net_device *dev,
4892 const struct nlattr *nla)
4894 struct nlattr *tb[IFLA_INET6_MAX + 1];
4896 if (dev && !__in6_dev_get(dev))
4897 return -EAFNOSUPPORT;
4899 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy);
4902 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4905 struct inet6_dev *idev = __in6_dev_get(dev);
4906 struct nlattr *tb[IFLA_INET6_MAX + 1];
4909 return -EAFNOSUPPORT;
4911 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4914 if (tb[IFLA_INET6_TOKEN]) {
4915 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
4920 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
4921 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
4923 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
4924 mode != IN6_ADDR_GEN_MODE_NONE &&
4925 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY)
4928 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
4929 !idev->cnf.stable_secret.initialized &&
4930 !dev_net(dev)->ipv6.devconf_dflt->stable_secret.initialized)
4933 idev->addr_gen_mode = mode;
4940 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4941 u32 portid, u32 seq, int event, unsigned int flags)
4943 struct net_device *dev = idev->dev;
4944 struct ifinfomsg *hdr;
4945 struct nlmsghdr *nlh;
4948 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
4952 hdr = nlmsg_data(nlh);
4953 hdr->ifi_family = AF_INET6;
4955 hdr->ifi_type = dev->type;
4956 hdr->ifi_index = dev->ifindex;
4957 hdr->ifi_flags = dev_get_flags(dev);
4958 hdr->ifi_change = 0;
4960 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4962 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4963 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4964 (dev->ifindex != dev_get_iflink(dev) &&
4965 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
4966 nla_put_u8(skb, IFLA_OPERSTATE,
4967 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
4968 goto nla_put_failure;
4969 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4971 goto nla_put_failure;
4973 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
4974 goto nla_put_failure;
4976 nla_nest_end(skb, protoinfo);
4977 nlmsg_end(skb, nlh);
4981 nlmsg_cancel(skb, nlh);
4985 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4987 struct net *net = sock_net(skb->sk);
4990 struct net_device *dev;
4991 struct inet6_dev *idev;
4992 struct hlist_head *head;
4995 s_idx = cb->args[1];
4998 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5000 head = &net->dev_index_head[h];
5001 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5004 idev = __in6_dev_get(dev);
5007 if (inet6_fill_ifinfo(skb, idev,
5008 NETLINK_CB(cb->skb).portid,
5010 RTM_NEWLINK, NLM_F_MULTI) < 0)
5024 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5026 struct sk_buff *skb;
5027 struct net *net = dev_net(idev->dev);
5030 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
5034 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
5036 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5037 WARN_ON(err == -EMSGSIZE);
5041 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
5045 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
5048 static inline size_t inet6_prefix_nlmsg_size(void)
5050 return NLMSG_ALIGN(sizeof(struct prefixmsg))
5051 + nla_total_size(sizeof(struct in6_addr))
5052 + nla_total_size(sizeof(struct prefix_cacheinfo));
5055 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
5056 struct prefix_info *pinfo, u32 portid, u32 seq,
5057 int event, unsigned int flags)
5059 struct prefixmsg *pmsg;
5060 struct nlmsghdr *nlh;
5061 struct prefix_cacheinfo ci;
5063 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
5067 pmsg = nlmsg_data(nlh);
5068 pmsg->prefix_family = AF_INET6;
5069 pmsg->prefix_pad1 = 0;
5070 pmsg->prefix_pad2 = 0;
5071 pmsg->prefix_ifindex = idev->dev->ifindex;
5072 pmsg->prefix_len = pinfo->prefix_len;
5073 pmsg->prefix_type = pinfo->type;
5074 pmsg->prefix_pad3 = 0;
5075 pmsg->prefix_flags = 0;
5077 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5078 if (pinfo->autoconf)
5079 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5081 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5082 goto nla_put_failure;
5083 ci.preferred_time = ntohl(pinfo->prefered);
5084 ci.valid_time = ntohl(pinfo->valid);
5085 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5086 goto nla_put_failure;
5087 nlmsg_end(skb, nlh);
5091 nlmsg_cancel(skb, nlh);
5095 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
5096 struct prefix_info *pinfo)
5098 struct sk_buff *skb;
5099 struct net *net = dev_net(idev->dev);
5102 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
5106 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
5108 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5109 WARN_ON(err == -EMSGSIZE);
5113 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5117 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
5120 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5122 struct net *net = dev_net(ifp->idev->dev);
5127 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5132 * If the address was optimistic
5133 * we inserted the route at the start of
5134 * our DAD process, so we don't need
5137 if (!(ifp->rt->rt6i_node))
5138 ip6_ins_rt(ifp->rt);
5139 if (ifp->idev->cnf.forwarding)
5140 addrconf_join_anycast(ifp);
5141 if (!ipv6_addr_any(&ifp->peer_addr))
5142 addrconf_prefix_route(&ifp->peer_addr, 128,
5143 ifp->idev->dev, 0, 0);
5146 if (ifp->idev->cnf.forwarding)
5147 addrconf_leave_anycast(ifp);
5148 addrconf_leave_solict(ifp->idev, &ifp->addr);
5149 if (!ipv6_addr_any(&ifp->peer_addr)) {
5150 struct rt6_info *rt;
5152 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5153 ifp->idev->dev, 0, 0);
5157 dst_hold(&ifp->rt->dst);
5159 ip6_del_rt(ifp->rt);
5161 rt_genid_bump_ipv6(net);
5164 atomic_inc(&net->ipv6.dev_addr_genid);
5167 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5170 if (likely(ifp->idev->dead == 0))
5171 __ipv6_ifa_notify(event, ifp);
5172 rcu_read_unlock_bh();
5175 #ifdef CONFIG_SYSCTL
5178 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
5179 void __user *buffer, size_t *lenp, loff_t *ppos)
5181 int *valp = ctl->data;
5184 struct ctl_table lctl;
5188 * ctl->data points to idev->cnf.forwarding, we should
5189 * not modify it until we get the rtnl lock.
5194 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5197 ret = addrconf_fixup_forwarding(ctl, valp, val);
5204 int addrconf_sysctl_hop_limit(struct ctl_table *ctl, int write,
5205 void __user *buffer, size_t *lenp, loff_t *ppos)
5207 struct ctl_table lctl;
5208 int min_hl = 1, max_hl = 255;
5211 lctl.extra1 = &min_hl;
5212 lctl.extra2 = &max_hl;
5214 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5218 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5219 void __user *buffer, size_t *lenp, loff_t *ppos)
5221 struct inet6_dev *idev = ctl->extra1;
5222 int min_mtu = IPV6_MIN_MTU;
5223 struct ctl_table lctl;
5226 lctl.extra1 = &min_mtu;
5227 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5229 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5232 static void dev_disable_change(struct inet6_dev *idev)
5234 struct netdev_notifier_info info;
5236 if (!idev || !idev->dev)
5239 netdev_notifier_info_init(&info, idev->dev);
5240 if (idev->cnf.disable_ipv6)
5241 addrconf_notify(NULL, NETDEV_DOWN, &info);
5243 addrconf_notify(NULL, NETDEV_UP, &info);
5246 static void addrconf_disable_change(struct net *net, __s32 newf)
5248 struct net_device *dev;
5249 struct inet6_dev *idev;
5252 for_each_netdev_rcu(net, dev) {
5253 idev = __in6_dev_get(dev);
5255 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5256 idev->cnf.disable_ipv6 = newf;
5258 dev_disable_change(idev);
5264 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
5269 if (!rtnl_trylock())
5270 return restart_syscall();
5272 net = (struct net *)table->extra2;
5276 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5281 if (p == &net->ipv6.devconf_all->disable_ipv6) {
5282 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5283 addrconf_disable_change(net, newf);
5284 } else if ((!newf) ^ (!old))
5285 dev_disable_change((struct inet6_dev *)table->extra1);
5292 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
5293 void __user *buffer, size_t *lenp, loff_t *ppos)
5295 int *valp = ctl->data;
5298 struct ctl_table lctl;
5302 * ctl->data points to idev->cnf.disable_ipv6, we should
5303 * not modify it until we get the rtnl lock.
5308 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5311 ret = addrconf_disable_ipv6(ctl, valp, val);
5318 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5319 void __user *buffer, size_t *lenp, loff_t *ppos)
5321 int *valp = ctl->data;
5326 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5329 if (write && old != new) {
5330 struct net *net = ctl->extra2;
5332 if (!rtnl_trylock())
5333 return restart_syscall();
5335 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5336 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5337 NETCONFA_IFINDEX_DEFAULT,
5338 net->ipv6.devconf_dflt);
5339 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5340 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5341 NETCONFA_IFINDEX_ALL,
5342 net->ipv6.devconf_all);
5344 struct inet6_dev *idev = ctl->extra1;
5346 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5356 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5357 void __user *buffer, size_t *lenp,
5361 struct in6_addr addr;
5362 char str[IPV6_MAX_STRLEN];
5363 struct ctl_table lctl = *ctl;
5364 struct net *net = ctl->extra2;
5365 struct ipv6_stable_secret *secret = ctl->data;
5367 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5370 lctl.maxlen = IPV6_MAX_STRLEN;
5373 if (!rtnl_trylock())
5374 return restart_syscall();
5376 if (!write && !secret->initialized) {
5382 err = snprintf(str, sizeof(str), "%pI6",
5384 if (err >= sizeof(str)) {
5390 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5394 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5399 secret->initialized = true;
5400 secret->secret = addr;
5402 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5403 struct net_device *dev;
5405 for_each_netdev(net, dev) {
5406 struct inet6_dev *idev = __in6_dev_get(dev);
5409 idev->addr_gen_mode =
5410 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5414 struct inet6_dev *idev = ctl->extra1;
5416 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5426 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
5428 void __user *buffer,
5432 int *valp = ctl->data;
5435 struct ctl_table lctl;
5438 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
5439 * we should not modify it until we get the rtnl lock.
5444 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5447 ret = addrconf_fixup_linkdown(ctl, valp, val);
5453 static struct addrconf_sysctl_table
5455 struct ctl_table_header *sysctl_header;
5456 struct ctl_table addrconf_vars[DEVCONF_MAX+1];
5457 } addrconf_sysctl __read_mostly = {
5458 .sysctl_header = NULL,
5461 .procname = "forwarding",
5462 .data = &ipv6_devconf.forwarding,
5463 .maxlen = sizeof(int),
5465 .proc_handler = addrconf_sysctl_forward,
5468 .procname = "hop_limit",
5469 .data = &ipv6_devconf.hop_limit,
5470 .maxlen = sizeof(int),
5472 .proc_handler = addrconf_sysctl_hop_limit,
5476 .data = &ipv6_devconf.mtu6,
5477 .maxlen = sizeof(int),
5479 .proc_handler = addrconf_sysctl_mtu,
5482 .procname = "accept_ra",
5483 .data = &ipv6_devconf.accept_ra,
5484 .maxlen = sizeof(int),
5486 .proc_handler = proc_dointvec,
5489 .procname = "accept_redirects",
5490 .data = &ipv6_devconf.accept_redirects,
5491 .maxlen = sizeof(int),
5493 .proc_handler = proc_dointvec,
5496 .procname = "autoconf",
5497 .data = &ipv6_devconf.autoconf,
5498 .maxlen = sizeof(int),
5500 .proc_handler = proc_dointvec,
5503 .procname = "dad_transmits",
5504 .data = &ipv6_devconf.dad_transmits,
5505 .maxlen = sizeof(int),
5507 .proc_handler = proc_dointvec,
5510 .procname = "router_solicitations",
5511 .data = &ipv6_devconf.rtr_solicits,
5512 .maxlen = sizeof(int),
5514 .proc_handler = proc_dointvec,
5517 .procname = "router_solicitation_interval",
5518 .data = &ipv6_devconf.rtr_solicit_interval,
5519 .maxlen = sizeof(int),
5521 .proc_handler = proc_dointvec_jiffies,
5524 .procname = "router_solicitation_delay",
5525 .data = &ipv6_devconf.rtr_solicit_delay,
5526 .maxlen = sizeof(int),
5528 .proc_handler = proc_dointvec_jiffies,
5531 .procname = "force_mld_version",
5532 .data = &ipv6_devconf.force_mld_version,
5533 .maxlen = sizeof(int),
5535 .proc_handler = proc_dointvec,
5538 .procname = "mldv1_unsolicited_report_interval",
5540 &ipv6_devconf.mldv1_unsolicited_report_interval,
5541 .maxlen = sizeof(int),
5543 .proc_handler = proc_dointvec_ms_jiffies,
5546 .procname = "mldv2_unsolicited_report_interval",
5548 &ipv6_devconf.mldv2_unsolicited_report_interval,
5549 .maxlen = sizeof(int),
5551 .proc_handler = proc_dointvec_ms_jiffies,
5554 .procname = "use_tempaddr",
5555 .data = &ipv6_devconf.use_tempaddr,
5556 .maxlen = sizeof(int),
5558 .proc_handler = proc_dointvec,
5561 .procname = "temp_valid_lft",
5562 .data = &ipv6_devconf.temp_valid_lft,
5563 .maxlen = sizeof(int),
5565 .proc_handler = proc_dointvec,
5568 .procname = "temp_prefered_lft",
5569 .data = &ipv6_devconf.temp_prefered_lft,
5570 .maxlen = sizeof(int),
5572 .proc_handler = proc_dointvec,
5575 .procname = "regen_max_retry",
5576 .data = &ipv6_devconf.regen_max_retry,
5577 .maxlen = sizeof(int),
5579 .proc_handler = proc_dointvec,
5582 .procname = "max_desync_factor",
5583 .data = &ipv6_devconf.max_desync_factor,
5584 .maxlen = sizeof(int),
5586 .proc_handler = proc_dointvec,
5589 .procname = "max_addresses",
5590 .data = &ipv6_devconf.max_addresses,
5591 .maxlen = sizeof(int),
5593 .proc_handler = proc_dointvec,
5596 .procname = "accept_ra_defrtr",
5597 .data = &ipv6_devconf.accept_ra_defrtr,
5598 .maxlen = sizeof(int),
5600 .proc_handler = proc_dointvec,
5603 .procname = "accept_ra_min_hop_limit",
5604 .data = &ipv6_devconf.accept_ra_min_hop_limit,
5605 .maxlen = sizeof(int),
5607 .proc_handler = proc_dointvec,
5610 .procname = "accept_ra_pinfo",
5611 .data = &ipv6_devconf.accept_ra_pinfo,
5612 .maxlen = sizeof(int),
5614 .proc_handler = proc_dointvec,
5616 #ifdef CONFIG_IPV6_ROUTER_PREF
5618 .procname = "accept_ra_rtr_pref",
5619 .data = &ipv6_devconf.accept_ra_rtr_pref,
5620 .maxlen = sizeof(int),
5622 .proc_handler = proc_dointvec,
5625 .procname = "router_probe_interval",
5626 .data = &ipv6_devconf.rtr_probe_interval,
5627 .maxlen = sizeof(int),
5629 .proc_handler = proc_dointvec_jiffies,
5631 #ifdef CONFIG_IPV6_ROUTE_INFO
5633 .procname = "accept_ra_rt_info_max_plen",
5634 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
5635 .maxlen = sizeof(int),
5637 .proc_handler = proc_dointvec,
5642 .procname = "proxy_ndp",
5643 .data = &ipv6_devconf.proxy_ndp,
5644 .maxlen = sizeof(int),
5646 .proc_handler = addrconf_sysctl_proxy_ndp,
5649 .procname = "accept_source_route",
5650 .data = &ipv6_devconf.accept_source_route,
5651 .maxlen = sizeof(int),
5653 .proc_handler = proc_dointvec,
5655 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5657 .procname = "optimistic_dad",
5658 .data = &ipv6_devconf.optimistic_dad,
5659 .maxlen = sizeof(int),
5661 .proc_handler = proc_dointvec,
5665 .procname = "use_optimistic",
5666 .data = &ipv6_devconf.use_optimistic,
5667 .maxlen = sizeof(int),
5669 .proc_handler = proc_dointvec,
5673 #ifdef CONFIG_IPV6_MROUTE
5675 .procname = "mc_forwarding",
5676 .data = &ipv6_devconf.mc_forwarding,
5677 .maxlen = sizeof(int),
5679 .proc_handler = proc_dointvec,
5683 .procname = "disable_ipv6",
5684 .data = &ipv6_devconf.disable_ipv6,
5685 .maxlen = sizeof(int),
5687 .proc_handler = addrconf_sysctl_disable,
5690 .procname = "accept_dad",
5691 .data = &ipv6_devconf.accept_dad,
5692 .maxlen = sizeof(int),
5694 .proc_handler = proc_dointvec,
5697 .procname = "force_tllao",
5698 .data = &ipv6_devconf.force_tllao,
5699 .maxlen = sizeof(int),
5701 .proc_handler = proc_dointvec
5704 .procname = "ndisc_notify",
5705 .data = &ipv6_devconf.ndisc_notify,
5706 .maxlen = sizeof(int),
5708 .proc_handler = proc_dointvec
5711 .procname = "suppress_frag_ndisc",
5712 .data = &ipv6_devconf.suppress_frag_ndisc,
5713 .maxlen = sizeof(int),
5715 .proc_handler = proc_dointvec
5718 .procname = "accept_ra_from_local",
5719 .data = &ipv6_devconf.accept_ra_from_local,
5720 .maxlen = sizeof(int),
5722 .proc_handler = proc_dointvec,
5725 .procname = "accept_ra_mtu",
5726 .data = &ipv6_devconf.accept_ra_mtu,
5727 .maxlen = sizeof(int),
5729 .proc_handler = proc_dointvec,
5732 .procname = "stable_secret",
5733 .data = &ipv6_devconf.stable_secret,
5734 .maxlen = IPV6_MAX_STRLEN,
5736 .proc_handler = addrconf_sysctl_stable_secret,
5739 .procname = "use_oif_addrs_only",
5740 .data = &ipv6_devconf.use_oif_addrs_only,
5741 .maxlen = sizeof(int),
5743 .proc_handler = proc_dointvec,
5746 .procname = "ignore_routes_with_linkdown",
5747 .data = &ipv6_devconf.ignore_routes_with_linkdown,
5748 .maxlen = sizeof(int),
5750 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
5758 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
5759 struct inet6_dev *idev, struct ipv6_devconf *p)
5762 struct addrconf_sysctl_table *t;
5763 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
5765 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
5769 for (i = 0; t->addrconf_vars[i].data; i++) {
5770 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
5771 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
5772 t->addrconf_vars[i].extra2 = net;
5775 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
5777 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
5778 if (!t->sysctl_header)
5790 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5792 struct addrconf_sysctl_table *t;
5799 unregister_net_sysctl_table(t->sysctl_header);
5803 static int addrconf_sysctl_register(struct inet6_dev *idev)
5807 if (!sysctl_dev_name_is_allowed(idev->dev->name))
5810 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
5811 &ndisc_ifinfo_sysctl_change);
5814 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
5817 neigh_sysctl_unregister(idev->nd_parms);
5822 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
5824 __addrconf_sysctl_unregister(&idev->cnf);
5825 neigh_sysctl_unregister(idev->nd_parms);
5831 static int __net_init addrconf_init_net(struct net *net)
5834 struct ipv6_devconf *all, *dflt;
5836 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
5840 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
5842 goto err_alloc_dflt;
5844 /* these will be inherited by all namespaces */
5845 dflt->autoconf = ipv6_defaults.autoconf;
5846 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
5848 dflt->stable_secret.initialized = false;
5849 all->stable_secret.initialized = false;
5851 net->ipv6.devconf_all = all;
5852 net->ipv6.devconf_dflt = dflt;
5854 #ifdef CONFIG_SYSCTL
5855 err = __addrconf_sysctl_register(net, "all", NULL, all);
5859 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
5865 #ifdef CONFIG_SYSCTL
5867 __addrconf_sysctl_unregister(all);
5877 static void __net_exit addrconf_exit_net(struct net *net)
5879 #ifdef CONFIG_SYSCTL
5880 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5881 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5883 kfree(net->ipv6.devconf_dflt);
5884 kfree(net->ipv6.devconf_all);
5887 static struct pernet_operations addrconf_ops = {
5888 .init = addrconf_init_net,
5889 .exit = addrconf_exit_net,
5892 static struct rtnl_af_ops inet6_ops __read_mostly = {
5894 .fill_link_af = inet6_fill_link_af,
5895 .get_link_af_size = inet6_get_link_af_size,
5896 .validate_link_af = inet6_validate_link_af,
5897 .set_link_af = inet6_set_link_af,
5901 * Init / cleanup code
5904 int __init addrconf_init(void)
5906 struct inet6_dev *idev;
5909 err = ipv6_addr_label_init();
5911 pr_crit("%s: cannot initialize default policy table: %d\n",
5916 err = register_pernet_subsys(&addrconf_ops);
5920 addrconf_wq = create_workqueue("ipv6_addrconf");
5926 /* The addrconf netdev notifier requires that loopback_dev
5927 * has it's ipv6 private information allocated and setup
5928 * before it can bring up and give link-local addresses
5929 * to other devices which are up.
5931 * Unfortunately, loopback_dev is not necessarily the first
5932 * entry in the global dev_base list of net devices. In fact,
5933 * it is likely to be the very last entry on that list.
5934 * So this causes the notifier registry below to try and
5935 * give link-local addresses to all devices besides loopback_dev
5936 * first, then loopback_dev, which cases all the non-loopback_dev
5937 * devices to fail to get a link-local address.
5939 * So, as a temporary fix, allocate the ipv6 structure for
5940 * loopback_dev first by hand.
5941 * Longer term, all of the dependencies ipv6 has upon the loopback
5942 * device and it being up should be removed.
5945 idev = ipv6_add_dev(init_net.loopback_dev);
5948 err = PTR_ERR(idev);
5952 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5953 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5955 register_netdevice_notifier(&ipv6_dev_notf);
5959 rtnl_af_register(&inet6_ops);
5961 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5966 /* Only the first call to __rtnl_register can fail */
5967 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5968 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5969 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5970 inet6_dump_ifaddr, NULL);
5971 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5972 inet6_dump_ifmcaddr, NULL);
5973 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5974 inet6_dump_ifacaddr, NULL);
5975 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
5976 inet6_netconf_dump_devconf, NULL);
5978 ipv6_addr_label_rtnl_register();
5982 rtnl_af_unregister(&inet6_ops);
5983 unregister_netdevice_notifier(&ipv6_dev_notf);
5985 destroy_workqueue(addrconf_wq);
5987 unregister_pernet_subsys(&addrconf_ops);
5989 ipv6_addr_label_cleanup();
5994 void addrconf_cleanup(void)
5996 struct net_device *dev;
5999 unregister_netdevice_notifier(&ipv6_dev_notf);
6000 unregister_pernet_subsys(&addrconf_ops);
6001 ipv6_addr_label_cleanup();
6005 __rtnl_af_unregister(&inet6_ops);
6007 /* clean dev list */
6008 for_each_netdev(&init_net, dev) {
6009 if (__in6_dev_get(dev) == NULL)
6011 addrconf_ifdown(dev, 1);
6013 addrconf_ifdown(init_net.loopback_dev, 2);
6018 spin_lock_bh(&addrconf_hash_lock);
6019 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6020 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
6021 spin_unlock_bh(&addrconf_hash_lock);
6022 cancel_delayed_work(&addr_chk_work);
6025 destroy_workqueue(addrconf_wq);