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,
208 .accept_ra_rt_table = 0,
210 .accept_source_route = 0, /* we do not accept RH0 by default. */
213 .suppress_frag_ndisc = 1,
216 .initialized = false,
218 .use_oif_addrs_only = 0,
219 .ignore_routes_with_linkdown = 0,
222 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
224 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
225 .mtu6 = IPV6_MIN_MTU,
227 .accept_redirects = 1,
229 .force_mld_version = 0,
230 .mldv1_unsolicited_report_interval = 10 * HZ,
231 .mldv2_unsolicited_report_interval = HZ,
233 .rtr_solicits = MAX_RTR_SOLICITATIONS,
234 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
235 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
237 .temp_valid_lft = TEMP_VALID_LIFETIME,
238 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
239 .regen_max_retry = REGEN_MAX_RETRY,
240 .max_desync_factor = MAX_DESYNC_FACTOR,
241 .max_addresses = IPV6_MAX_ADDRESSES,
242 .accept_ra_defrtr = 1,
243 .accept_ra_from_local = 0,
244 .accept_ra_min_hop_limit= 1,
245 .accept_ra_pinfo = 1,
246 #ifdef CONFIG_IPV6_ROUTER_PREF
247 .accept_ra_rtr_pref = 1,
248 .rtr_probe_interval = 60 * HZ,
249 #ifdef CONFIG_IPV6_ROUTE_INFO
250 .accept_ra_rt_info_max_plen = 0,
253 .accept_ra_rt_table = 0,
255 .accept_source_route = 0, /* we do not accept RH0 by default. */
258 .suppress_frag_ndisc = 1,
261 .initialized = false,
263 .use_oif_addrs_only = 0,
264 .ignore_routes_with_linkdown = 0,
267 /* Check if a valid qdisc is available */
268 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
270 return !qdisc_tx_is_noop(dev);
273 static void addrconf_del_rs_timer(struct inet6_dev *idev)
275 if (del_timer(&idev->rs_timer))
279 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
281 if (cancel_delayed_work(&ifp->dad_work))
285 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
288 if (!timer_pending(&idev->rs_timer))
290 mod_timer(&idev->rs_timer, jiffies + when);
293 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
296 if (!delayed_work_pending(&ifp->dad_work))
298 mod_delayed_work(addrconf_wq, &ifp->dad_work, delay);
301 static int snmp6_alloc_dev(struct inet6_dev *idev)
305 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
306 if (!idev->stats.ipv6)
309 for_each_possible_cpu(i) {
310 struct ipstats_mib *addrconf_stats;
311 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
312 u64_stats_init(&addrconf_stats->syncp);
316 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
318 if (!idev->stats.icmpv6dev)
320 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
322 if (!idev->stats.icmpv6msgdev)
328 kfree(idev->stats.icmpv6dev);
330 free_percpu(idev->stats.ipv6);
335 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
337 struct inet6_dev *ndev;
342 if (dev->mtu < IPV6_MIN_MTU)
343 return ERR_PTR(-EINVAL);
345 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
349 rwlock_init(&ndev->lock);
351 INIT_LIST_HEAD(&ndev->addr_list);
352 setup_timer(&ndev->rs_timer, addrconf_rs_timer,
353 (unsigned long)ndev);
354 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
356 if (ndev->cnf.stable_secret.initialized)
357 ndev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
359 ndev->addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64;
361 ndev->cnf.mtu6 = dev->mtu;
362 ndev->cnf.sysctl = NULL;
363 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
364 if (!ndev->nd_parms) {
368 if (ndev->cnf.forwarding)
369 dev_disable_lro(dev);
370 /* We refer to the device */
373 if (snmp6_alloc_dev(ndev) < 0) {
375 "%s: cannot allocate memory for statistics; dev=%s.\n",
376 __func__, dev->name);
377 neigh_parms_release(&nd_tbl, ndev->nd_parms);
383 if (snmp6_register_dev(ndev) < 0) {
385 "%s: cannot create /proc/net/dev_snmp6/%s\n",
386 __func__, dev->name);
390 /* One reference from device. We must do this before
391 * we invoke __ipv6_regen_rndid().
395 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
396 ndev->cnf.accept_dad = -1;
398 #if IS_ENABLED(CONFIG_IPV6_SIT)
399 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
400 pr_info("%s: Disabled Multicast RS\n", dev->name);
401 ndev->cnf.rtr_solicits = 0;
405 INIT_LIST_HEAD(&ndev->tempaddr_list);
406 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
407 if ((dev->flags&IFF_LOOPBACK) ||
408 dev->type == ARPHRD_TUNNEL ||
409 dev->type == ARPHRD_TUNNEL6 ||
410 dev->type == ARPHRD_SIT ||
411 dev->type == ARPHRD_NONE) {
412 ndev->cnf.use_tempaddr = -1;
415 ipv6_regen_rndid((unsigned long) ndev);
418 ndev->token = in6addr_any;
420 if (netif_running(dev) && addrconf_qdisc_ok(dev))
421 ndev->if_flags |= IF_READY;
423 ipv6_mc_init_dev(ndev);
424 ndev->tstamp = jiffies;
425 err = addrconf_sysctl_register(ndev);
427 ipv6_mc_destroy_dev(ndev);
428 del_timer(&ndev->regen_timer);
429 snmp6_unregister_dev(ndev);
432 /* protected by rtnl_lock */
433 rcu_assign_pointer(dev->ip6_ptr, ndev);
435 /* Join interface-local all-node multicast group */
436 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
438 /* Join all-node multicast group */
439 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
441 /* Join all-router multicast group if forwarding is set */
442 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
443 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
448 neigh_parms_release(&nd_tbl, ndev->nd_parms);
450 in6_dev_finish_destroy(ndev);
454 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
456 struct inet6_dev *idev;
460 idev = __in6_dev_get(dev);
462 idev = ipv6_add_dev(dev);
467 if (dev->flags&IFF_UP)
472 static int inet6_netconf_msgsize_devconf(int type)
474 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
475 + nla_total_size(4); /* NETCONFA_IFINDEX */
477 /* type -1 is used for ALL */
478 if (type == -1 || type == NETCONFA_FORWARDING)
479 size += nla_total_size(4);
480 #ifdef CONFIG_IPV6_MROUTE
481 if (type == -1 || type == NETCONFA_MC_FORWARDING)
482 size += nla_total_size(4);
484 if (type == -1 || type == NETCONFA_PROXY_NEIGH)
485 size += nla_total_size(4);
487 if (type == -1 || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
488 size += nla_total_size(4);
493 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
494 struct ipv6_devconf *devconf, u32 portid,
495 u32 seq, int event, unsigned int flags,
498 struct nlmsghdr *nlh;
499 struct netconfmsg *ncm;
501 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
506 ncm = nlmsg_data(nlh);
507 ncm->ncm_family = AF_INET6;
509 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
510 goto nla_put_failure;
512 /* type -1 is used for ALL */
513 if ((type == -1 || type == NETCONFA_FORWARDING) &&
514 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
515 goto nla_put_failure;
516 #ifdef CONFIG_IPV6_MROUTE
517 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
518 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
519 devconf->mc_forwarding) < 0)
520 goto nla_put_failure;
522 if ((type == -1 || type == NETCONFA_PROXY_NEIGH) &&
523 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
524 goto nla_put_failure;
526 if ((type == -1 || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
527 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
528 devconf->ignore_routes_with_linkdown) < 0)
529 goto nla_put_failure;
535 nlmsg_cancel(skb, nlh);
539 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
540 struct ipv6_devconf *devconf)
545 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
549 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
550 RTM_NEWNETCONF, 0, type);
552 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
553 WARN_ON(err == -EMSGSIZE);
557 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
560 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
563 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
564 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
565 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
566 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
567 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
570 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
571 struct nlmsghdr *nlh)
573 struct net *net = sock_net(in_skb->sk);
574 struct nlattr *tb[NETCONFA_MAX+1];
575 struct netconfmsg *ncm;
577 struct ipv6_devconf *devconf;
578 struct inet6_dev *in6_dev;
579 struct net_device *dev;
583 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
584 devconf_ipv6_policy);
589 if (!tb[NETCONFA_IFINDEX])
592 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
594 case NETCONFA_IFINDEX_ALL:
595 devconf = net->ipv6.devconf_all;
597 case NETCONFA_IFINDEX_DEFAULT:
598 devconf = net->ipv6.devconf_dflt;
601 dev = __dev_get_by_index(net, ifindex);
604 in6_dev = __in6_dev_get(dev);
607 devconf = &in6_dev->cnf;
612 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
616 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
617 NETLINK_CB(in_skb).portid,
618 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
621 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
622 WARN_ON(err == -EMSGSIZE);
626 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
631 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
632 struct netlink_callback *cb)
634 struct net *net = sock_net(skb->sk);
637 struct net_device *dev;
638 struct inet6_dev *idev;
639 struct hlist_head *head;
642 s_idx = idx = cb->args[1];
644 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
646 head = &net->dev_index_head[h];
648 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
650 hlist_for_each_entry_rcu(dev, head, index_hlist) {
653 idev = __in6_dev_get(dev);
657 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
659 NETLINK_CB(cb->skb).portid,
667 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
673 if (h == NETDEV_HASHENTRIES) {
674 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
675 net->ipv6.devconf_all,
676 NETLINK_CB(cb->skb).portid,
678 RTM_NEWNETCONF, NLM_F_MULTI,
684 if (h == NETDEV_HASHENTRIES + 1) {
685 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
686 net->ipv6.devconf_dflt,
687 NETLINK_CB(cb->skb).portid,
689 RTM_NEWNETCONF, NLM_F_MULTI,
703 static void dev_forward_change(struct inet6_dev *idev)
705 struct net_device *dev;
706 struct inet6_ifaddr *ifa;
711 if (idev->cnf.forwarding)
712 dev_disable_lro(dev);
713 if (dev->flags & IFF_MULTICAST) {
714 if (idev->cnf.forwarding) {
715 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
716 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
717 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
719 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
720 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
721 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
725 list_for_each_entry(ifa, &idev->addr_list, if_list) {
726 if (ifa->flags&IFA_F_TENTATIVE)
728 if (idev->cnf.forwarding)
729 addrconf_join_anycast(ifa);
731 addrconf_leave_anycast(ifa);
733 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
734 dev->ifindex, &idev->cnf);
738 static void addrconf_forward_change(struct net *net, __s32 newf)
740 struct net_device *dev;
741 struct inet6_dev *idev;
743 for_each_netdev(net, dev) {
744 idev = __in6_dev_get(dev);
746 int changed = (!idev->cnf.forwarding) ^ (!newf);
747 idev->cnf.forwarding = newf;
749 dev_forward_change(idev);
754 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
760 return restart_syscall();
762 net = (struct net *)table->extra2;
766 if (p == &net->ipv6.devconf_dflt->forwarding) {
767 if ((!newf) ^ (!old))
768 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
769 NETCONFA_IFINDEX_DEFAULT,
770 net->ipv6.devconf_dflt);
775 if (p == &net->ipv6.devconf_all->forwarding) {
776 net->ipv6.devconf_dflt->forwarding = newf;
777 addrconf_forward_change(net, newf);
778 if ((!newf) ^ (!old))
779 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
780 NETCONFA_IFINDEX_ALL,
781 net->ipv6.devconf_all);
782 } else if ((!newf) ^ (!old))
783 dev_forward_change((struct inet6_dev *)table->extra1);
787 rt6_purge_dflt_routers(net);
791 static void addrconf_linkdown_change(struct net *net, __s32 newf)
793 struct net_device *dev;
794 struct inet6_dev *idev;
796 for_each_netdev(net, dev) {
797 idev = __in6_dev_get(dev);
799 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
801 idev->cnf.ignore_routes_with_linkdown = newf;
803 inet6_netconf_notify_devconf(dev_net(dev),
804 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
811 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
817 return restart_syscall();
819 net = (struct net *)table->extra2;
823 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
824 if ((!newf) ^ (!old))
825 inet6_netconf_notify_devconf(net,
826 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
827 NETCONFA_IFINDEX_DEFAULT,
828 net->ipv6.devconf_dflt);
833 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
834 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
835 addrconf_linkdown_change(net, newf);
836 if ((!newf) ^ (!old))
837 inet6_netconf_notify_devconf(net,
838 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
839 NETCONFA_IFINDEX_ALL,
840 net->ipv6.devconf_all);
849 /* Nobody refers to this ifaddr, destroy it */
850 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
852 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
854 #ifdef NET_REFCNT_DEBUG
855 pr_debug("%s\n", __func__);
858 in6_dev_put(ifp->idev);
860 if (cancel_delayed_work(&ifp->dad_work))
861 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
864 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
865 pr_warn("Freeing alive inet6 address %p\n", ifp);
874 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
877 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
880 * Each device address list is sorted in order of scope -
881 * global before linklocal.
883 list_for_each(p, &idev->addr_list) {
884 struct inet6_ifaddr *ifa
885 = list_entry(p, struct inet6_ifaddr, if_list);
886 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
890 list_add_tail(&ifp->if_list, p);
893 static u32 inet6_addr_hash(const struct in6_addr *addr)
895 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
898 /* On success it returns ifp with increased reference count */
900 static struct inet6_ifaddr *
901 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
902 const struct in6_addr *peer_addr, int pfxlen,
903 int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
905 struct inet6_ifaddr *ifa = NULL;
909 int addr_type = ipv6_addr_type(addr);
911 if (addr_type == IPV6_ADDR_ANY ||
912 addr_type & IPV6_ADDR_MULTICAST ||
913 (!(idev->dev->flags & IFF_LOOPBACK) &&
914 addr_type & IPV6_ADDR_LOOPBACK))
915 return ERR_PTR(-EADDRNOTAVAIL);
919 err = -ENODEV; /*XXX*/
923 if (idev->cnf.disable_ipv6) {
928 spin_lock(&addrconf_hash_lock);
930 /* Ignore adding duplicate addresses on an interface */
931 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
932 ADBG("ipv6_add_addr: already assigned\n");
937 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
940 ADBG("ipv6_add_addr: malloc failed\n");
945 rt = addrconf_dst_alloc(idev, addr, false);
951 neigh_parms_data_state_setall(idev->nd_parms);
955 ifa->peer_addr = *peer_addr;
957 spin_lock_init(&ifa->lock);
958 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
959 INIT_HLIST_NODE(&ifa->addr_lst);
961 ifa->prefix_len = pfxlen;
962 ifa->flags = flags | IFA_F_TENTATIVE;
963 ifa->valid_lft = valid_lft;
964 ifa->prefered_lft = prefered_lft;
965 ifa->cstamp = ifa->tstamp = jiffies;
966 ifa->tokenized = false;
975 /* Add to big hash table */
976 hash = inet6_addr_hash(addr);
978 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
979 spin_unlock(&addrconf_hash_lock);
981 write_lock(&idev->lock);
982 /* Add to inet6_dev unicast addr list. */
983 ipv6_link_dev_addr(idev, ifa);
985 if (ifa->flags&IFA_F_TEMPORARY) {
986 list_add(&ifa->tmp_list, &idev->tempaddr_list);
991 write_unlock(&idev->lock);
993 rcu_read_unlock_bh();
995 if (likely(err == 0))
996 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1004 spin_unlock(&addrconf_hash_lock);
1008 enum cleanup_prefix_rt_t {
1009 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1010 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1011 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1015 * Check, whether the prefix for ifp would still need a prefix route
1016 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1019 * 1) we don't purge prefix if address was not permanent.
1020 * prefix is managed by its own lifetime.
1021 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1022 * 3) if there are no addresses, delete prefix.
1023 * 4) if there are still other permanent address(es),
1024 * corresponding prefix is still permanent.
1025 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1026 * don't purge the prefix, assume user space is managing it.
1027 * 6) otherwise, update prefix lifetime to the
1028 * longest valid lifetime among the corresponding
1029 * addresses on the device.
1030 * Note: subsequent RA will update lifetime.
1032 static enum cleanup_prefix_rt_t
1033 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1035 struct inet6_ifaddr *ifa;
1036 struct inet6_dev *idev = ifp->idev;
1037 unsigned long lifetime;
1038 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1042 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1045 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1048 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1049 return CLEANUP_PREFIX_RT_NOP;
1051 action = CLEANUP_PREFIX_RT_EXPIRE;
1053 spin_lock(&ifa->lock);
1055 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1057 * Note: Because this address is
1058 * not permanent, lifetime <
1059 * LONG_MAX / HZ here.
1061 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1062 *expires = ifa->tstamp + lifetime * HZ;
1063 spin_unlock(&ifa->lock);
1070 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
1072 struct rt6_info *rt;
1074 rt = addrconf_get_prefix_route(&ifp->addr,
1077 0, RTF_GATEWAY | RTF_DEFAULT);
1082 if (!(rt->rt6i_flags & RTF_EXPIRES))
1083 rt6_set_expires(rt, expires);
1090 /* This function wants to get referenced ifp and releases it before return */
1092 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1095 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1096 unsigned long expires;
1100 spin_lock_bh(&ifp->lock);
1102 ifp->state = INET6_IFADDR_STATE_DEAD;
1103 spin_unlock_bh(&ifp->lock);
1105 if (state == INET6_IFADDR_STATE_DEAD)
1108 spin_lock_bh(&addrconf_hash_lock);
1109 hlist_del_init_rcu(&ifp->addr_lst);
1110 spin_unlock_bh(&addrconf_hash_lock);
1112 write_lock_bh(&ifp->idev->lock);
1114 if (ifp->flags&IFA_F_TEMPORARY) {
1115 list_del(&ifp->tmp_list);
1117 in6_ifa_put(ifp->ifpub);
1123 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1124 action = check_cleanup_prefix_route(ifp, &expires);
1126 list_del_init(&ifp->if_list);
1129 write_unlock_bh(&ifp->idev->lock);
1131 addrconf_del_dad_work(ifp);
1133 ipv6_ifa_notify(RTM_DELADDR, ifp);
1135 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1137 if (action != CLEANUP_PREFIX_RT_NOP) {
1138 cleanup_prefix_route(ifp, expires,
1139 action == CLEANUP_PREFIX_RT_DEL);
1142 /* clean up prefsrc entries */
1143 rt6_remove_prefsrc(ifp);
1148 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1150 struct inet6_dev *idev = ifp->idev;
1151 struct in6_addr addr, *tmpaddr;
1152 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1153 unsigned long regen_advance;
1157 unsigned long now = jiffies;
1159 write_lock_bh(&idev->lock);
1161 spin_lock_bh(&ift->lock);
1162 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1163 spin_unlock_bh(&ift->lock);
1170 if (idev->cnf.use_tempaddr <= 0) {
1171 write_unlock_bh(&idev->lock);
1172 pr_info("%s: use_tempaddr is disabled\n", __func__);
1177 spin_lock_bh(&ifp->lock);
1178 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1179 idev->cnf.use_tempaddr = -1; /*XXX*/
1180 spin_unlock_bh(&ifp->lock);
1181 write_unlock_bh(&idev->lock);
1182 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1189 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1190 __ipv6_try_regen_rndid(idev, tmpaddr);
1191 memcpy(&addr.s6_addr[8], idev->rndid, 8);
1192 age = (now - ifp->tstamp) / HZ;
1193 tmp_valid_lft = min_t(__u32,
1195 idev->cnf.temp_valid_lft + age);
1196 tmp_prefered_lft = min_t(__u32,
1198 idev->cnf.temp_prefered_lft + age -
1199 idev->cnf.max_desync_factor);
1200 tmp_plen = ifp->prefix_len;
1201 tmp_tstamp = ifp->tstamp;
1202 spin_unlock_bh(&ifp->lock);
1204 regen_advance = idev->cnf.regen_max_retry *
1205 idev->cnf.dad_transmits *
1206 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1207 write_unlock_bh(&idev->lock);
1209 /* A temporary address is created only if this calculated Preferred
1210 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1211 * an implementation must not create a temporary address with a zero
1212 * Preferred Lifetime.
1213 * Use age calculation as in addrconf_verify to avoid unnecessary
1214 * temporary addresses being generated.
1216 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1217 if (tmp_prefered_lft <= regen_advance + age) {
1224 addr_flags = IFA_F_TEMPORARY;
1225 /* set in addrconf_prefix_rcv() */
1226 if (ifp->flags & IFA_F_OPTIMISTIC)
1227 addr_flags |= IFA_F_OPTIMISTIC;
1229 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1230 ipv6_addr_scope(&addr), addr_flags,
1231 tmp_valid_lft, tmp_prefered_lft);
1235 pr_info("%s: retry temporary address regeneration\n", __func__);
1237 write_lock_bh(&idev->lock);
1241 spin_lock_bh(&ift->lock);
1244 ift->tstamp = tmp_tstamp;
1245 spin_unlock_bh(&ift->lock);
1247 addrconf_dad_start(ift);
1255 * Choose an appropriate source address (RFC3484)
1258 IPV6_SADDR_RULE_INIT = 0,
1259 IPV6_SADDR_RULE_LOCAL,
1260 IPV6_SADDR_RULE_SCOPE,
1261 IPV6_SADDR_RULE_PREFERRED,
1262 #ifdef CONFIG_IPV6_MIP6
1263 IPV6_SADDR_RULE_HOA,
1265 IPV6_SADDR_RULE_OIF,
1266 IPV6_SADDR_RULE_LABEL,
1267 IPV6_SADDR_RULE_PRIVACY,
1268 IPV6_SADDR_RULE_ORCHID,
1269 IPV6_SADDR_RULE_PREFIX,
1270 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1271 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1276 struct ipv6_saddr_score {
1279 struct inet6_ifaddr *ifa;
1280 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1285 struct ipv6_saddr_dst {
1286 const struct in6_addr *addr;
1293 static inline int ipv6_saddr_preferred(int type)
1295 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1300 static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev)
1302 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1303 return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic;
1309 static int ipv6_get_saddr_eval(struct net *net,
1310 struct ipv6_saddr_score *score,
1311 struct ipv6_saddr_dst *dst,
1316 if (i <= score->rule) {
1318 case IPV6_SADDR_RULE_SCOPE:
1319 ret = score->scopedist;
1321 case IPV6_SADDR_RULE_PREFIX:
1322 ret = score->matchlen;
1325 ret = !!test_bit(i, score->scorebits);
1331 case IPV6_SADDR_RULE_INIT:
1332 /* Rule 0: remember if hiscore is not ready yet */
1335 case IPV6_SADDR_RULE_LOCAL:
1336 /* Rule 1: Prefer same address */
1337 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1339 case IPV6_SADDR_RULE_SCOPE:
1340 /* Rule 2: Prefer appropriate scope
1345 * ---+--+-+---> scope
1347 * | d is scope of the destination.
1349 * | \ <- smaller scope is better if
1350 * B-15 | \ if scope is enough for destination.
1351 * | ret = B - scope (-1 <= scope >= d <= 15).
1353 * |/ <- greater is better
1354 * -C / if scope is not enough for destination.
1355 * /| ret = scope - C (-1 <= d < scope <= 15).
1357 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1358 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1359 * Assume B = 0 and we get C > 29.
1361 ret = __ipv6_addr_src_scope(score->addr_type);
1362 if (ret >= dst->scope)
1365 ret -= 128; /* 30 is enough */
1366 score->scopedist = ret;
1368 case IPV6_SADDR_RULE_PREFERRED:
1370 /* Rule 3: Avoid deprecated and optimistic addresses */
1371 u8 avoid = IFA_F_DEPRECATED;
1373 if (!ipv6_use_optimistic_addr(score->ifa->idev))
1374 avoid |= IFA_F_OPTIMISTIC;
1375 ret = ipv6_saddr_preferred(score->addr_type) ||
1376 !(score->ifa->flags & avoid);
1379 #ifdef CONFIG_IPV6_MIP6
1380 case IPV6_SADDR_RULE_HOA:
1382 /* Rule 4: Prefer home address */
1383 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1384 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1388 case IPV6_SADDR_RULE_OIF:
1389 /* Rule 5: Prefer outgoing interface */
1390 ret = (!dst->ifindex ||
1391 dst->ifindex == score->ifa->idev->dev->ifindex);
1393 case IPV6_SADDR_RULE_LABEL:
1394 /* Rule 6: Prefer matching label */
1395 ret = ipv6_addr_label(net,
1396 &score->ifa->addr, score->addr_type,
1397 score->ifa->idev->dev->ifindex) == dst->label;
1399 case IPV6_SADDR_RULE_PRIVACY:
1401 /* Rule 7: Prefer public address
1402 * Note: prefer temporary address if use_tempaddr >= 2
1404 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1405 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1406 score->ifa->idev->cnf.use_tempaddr >= 2;
1407 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1410 case IPV6_SADDR_RULE_ORCHID:
1411 /* Rule 8-: Prefer ORCHID vs ORCHID or
1412 * non-ORCHID vs non-ORCHID
1414 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1415 ipv6_addr_orchid(dst->addr));
1417 case IPV6_SADDR_RULE_PREFIX:
1418 /* Rule 8: Use longest matching prefix */
1419 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1420 if (ret > score->ifa->prefix_len)
1421 ret = score->ifa->prefix_len;
1422 score->matchlen = ret;
1424 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1425 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1426 /* Optimistic addresses still have lower precedence than other
1427 * preferred addresses.
1429 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1437 __set_bit(i, score->scorebits);
1443 static int __ipv6_dev_get_saddr(struct net *net,
1444 struct ipv6_saddr_dst *dst,
1445 struct inet6_dev *idev,
1446 struct ipv6_saddr_score *scores,
1449 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1451 read_lock_bh(&idev->lock);
1452 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1456 * - Tentative Address (RFC2462 section 5.4)
1457 * - A tentative address is not considered
1458 * "assigned to an interface" in the traditional
1459 * sense, unless it is also flagged as optimistic.
1460 * - Candidate Source Address (section 4)
1461 * - In any case, anycast addresses, multicast
1462 * addresses, and the unspecified address MUST
1463 * NOT be included in a candidate set.
1465 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1466 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1469 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1471 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1472 score->addr_type & IPV6_ADDR_MULTICAST)) {
1473 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1479 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1481 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1482 int minihiscore, miniscore;
1484 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1485 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1487 if (minihiscore > miniscore) {
1488 if (i == IPV6_SADDR_RULE_SCOPE &&
1489 score->scopedist > 0) {
1492 * each remaining entry
1493 * has too small (not enough)
1494 * scope, because ifa entries
1495 * are sorted by their scope
1501 } else if (minihiscore < miniscore) {
1503 in6_ifa_put(hiscore->ifa);
1505 in6_ifa_hold(score->ifa);
1507 swap(hiscore, score);
1508 hiscore_idx = 1 - hiscore_idx;
1510 /* restore our iterator */
1511 score->ifa = hiscore->ifa;
1518 read_unlock_bh(&idev->lock);
1522 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1523 const struct in6_addr *daddr, unsigned int prefs,
1524 struct in6_addr *saddr)
1526 struct ipv6_saddr_score scores[2], *hiscore;
1527 struct ipv6_saddr_dst dst;
1528 struct inet6_dev *idev;
1529 struct net_device *dev;
1531 bool use_oif_addr = false;
1532 int hiscore_idx = 0;
1534 dst_type = __ipv6_addr_type(daddr);
1536 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1537 dst.scope = __ipv6_addr_src_scope(dst_type);
1538 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1541 scores[hiscore_idx].rule = -1;
1542 scores[hiscore_idx].ifa = NULL;
1546 /* Candidate Source Address (section 4)
1547 * - multicast and link-local destination address,
1548 * the set of candidate source address MUST only
1549 * include addresses assigned to interfaces
1550 * belonging to the same link as the outgoing
1552 * (- For site-local destination addresses, the
1553 * set of candidate source addresses MUST only
1554 * include addresses assigned to interfaces
1555 * belonging to the same site as the outgoing
1557 * - "It is RECOMMENDED that the candidate source addresses
1558 * be the set of unicast addresses assigned to the
1559 * interface that will be used to send to the destination
1560 * (the 'outgoing' interface)." (RFC 6724)
1563 idev = __in6_dev_get(dst_dev);
1564 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1565 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1566 (idev && idev->cnf.use_oif_addrs_only)) {
1567 use_oif_addr = true;
1573 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1575 for_each_netdev_rcu(net, dev) {
1576 idev = __in6_dev_get(dev);
1579 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1584 hiscore = &scores[hiscore_idx];
1586 return -EADDRNOTAVAIL;
1588 *saddr = hiscore->ifa->addr;
1589 in6_ifa_put(hiscore->ifa);
1592 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1594 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1597 struct inet6_ifaddr *ifp;
1598 int err = -EADDRNOTAVAIL;
1600 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1601 if (ifp->scope > IFA_LINK)
1603 if (ifp->scope == IFA_LINK &&
1604 !(ifp->flags & banned_flags)) {
1613 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1616 struct inet6_dev *idev;
1617 int err = -EADDRNOTAVAIL;
1620 idev = __in6_dev_get(dev);
1622 read_lock_bh(&idev->lock);
1623 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1624 read_unlock_bh(&idev->lock);
1630 static int ipv6_count_addresses(struct inet6_dev *idev)
1633 struct inet6_ifaddr *ifp;
1635 read_lock_bh(&idev->lock);
1636 list_for_each_entry(ifp, &idev->addr_list, if_list)
1638 read_unlock_bh(&idev->lock);
1642 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1643 const struct net_device *dev, int strict)
1645 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
1647 EXPORT_SYMBOL(ipv6_chk_addr);
1649 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1650 const struct net_device *dev, int strict,
1653 struct inet6_ifaddr *ifp;
1654 unsigned int hash = inet6_addr_hash(addr);
1658 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1659 if (!net_eq(dev_net(ifp->idev->dev), net))
1661 /* Decouple optimistic from tentative for evaluation here.
1662 * Ban optimistic addresses explicitly, when required.
1664 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1665 ? (ifp->flags&~IFA_F_TENTATIVE)
1667 if (ipv6_addr_equal(&ifp->addr, addr) &&
1668 !(ifp_flags&banned_flags) &&
1669 (!dev || ifp->idev->dev == dev ||
1670 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1671 rcu_read_unlock_bh();
1676 rcu_read_unlock_bh();
1679 EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1681 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1682 struct net_device *dev)
1684 unsigned int hash = inet6_addr_hash(addr);
1685 struct inet6_ifaddr *ifp;
1687 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1688 if (!net_eq(dev_net(ifp->idev->dev), net))
1690 if (ipv6_addr_equal(&ifp->addr, addr)) {
1691 if (!dev || ifp->idev->dev == dev)
1698 /* Compares an address/prefix_len with addresses on device @dev.
1699 * If one is found it returns true.
1701 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1702 const unsigned int prefix_len, struct net_device *dev)
1704 struct inet6_dev *idev;
1705 struct inet6_ifaddr *ifa;
1709 idev = __in6_dev_get(dev);
1711 read_lock_bh(&idev->lock);
1712 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1713 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1717 read_unlock_bh(&idev->lock);
1723 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1725 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1727 struct inet6_dev *idev;
1728 struct inet6_ifaddr *ifa;
1733 idev = __in6_dev_get(dev);
1735 read_lock_bh(&idev->lock);
1736 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1737 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1742 read_unlock_bh(&idev->lock);
1747 EXPORT_SYMBOL(ipv6_chk_prefix);
1749 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1750 struct net_device *dev, int strict)
1752 struct inet6_ifaddr *ifp, *result = NULL;
1753 unsigned int hash = inet6_addr_hash(addr);
1756 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1757 if (!net_eq(dev_net(ifp->idev->dev), net))
1759 if (ipv6_addr_equal(&ifp->addr, addr)) {
1760 if (!dev || ifp->idev->dev == dev ||
1761 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1768 rcu_read_unlock_bh();
1773 /* Gets referenced address, destroys ifaddr */
1775 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1777 if (ifp->flags&IFA_F_PERMANENT) {
1778 spin_lock_bh(&ifp->lock);
1779 addrconf_del_dad_work(ifp);
1780 ifp->flags |= IFA_F_TENTATIVE;
1782 ifp->flags |= IFA_F_DADFAILED;
1783 spin_unlock_bh(&ifp->lock);
1785 ipv6_ifa_notify(0, ifp);
1787 } else if (ifp->flags&IFA_F_TEMPORARY) {
1788 struct inet6_ifaddr *ifpub;
1789 spin_lock_bh(&ifp->lock);
1792 in6_ifa_hold(ifpub);
1793 spin_unlock_bh(&ifp->lock);
1794 ipv6_create_tempaddr(ifpub, ifp);
1797 spin_unlock_bh(&ifp->lock);
1805 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1809 spin_lock_bh(&ifp->lock);
1810 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1811 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1814 spin_unlock_bh(&ifp->lock);
1819 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1821 struct in6_addr addr;
1822 struct inet6_dev *idev = ifp->idev;
1823 struct net *net = dev_net(ifp->idev->dev);
1825 if (addrconf_dad_end(ifp)) {
1830 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1831 ifp->idev->dev->name, &ifp->addr);
1833 spin_lock_bh(&ifp->lock);
1835 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
1836 int scope = ifp->scope;
1837 u32 flags = ifp->flags;
1838 struct in6_addr new_addr;
1839 struct inet6_ifaddr *ifp2;
1840 u32 valid_lft, preferred_lft;
1841 int pfxlen = ifp->prefix_len;
1842 int retries = ifp->stable_privacy_retry + 1;
1844 if (retries > net->ipv6.sysctl.idgen_retries) {
1845 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
1846 ifp->idev->dev->name);
1850 new_addr = ifp->addr;
1851 if (ipv6_generate_stable_address(&new_addr, retries,
1855 valid_lft = ifp->valid_lft;
1856 preferred_lft = ifp->prefered_lft;
1858 spin_unlock_bh(&ifp->lock);
1860 if (idev->cnf.max_addresses &&
1861 ipv6_count_addresses(idev) >=
1862 idev->cnf.max_addresses)
1865 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
1866 ifp->idev->dev->name);
1868 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
1869 scope, flags, valid_lft,
1874 spin_lock_bh(&ifp2->lock);
1875 ifp2->stable_privacy_retry = retries;
1876 ifp2->state = INET6_IFADDR_STATE_PREDAD;
1877 spin_unlock_bh(&ifp2->lock);
1879 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
1882 spin_lock_bh(&ifp->lock);
1883 } else if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1884 addr.s6_addr32[0] = htonl(0xfe800000);
1885 addr.s6_addr32[1] = 0;
1887 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1888 ipv6_addr_equal(&ifp->addr, &addr)) {
1889 /* DAD failed for link-local based on MAC address */
1890 idev->cnf.disable_ipv6 = 1;
1892 pr_info("%s: IPv6 being disabled!\n",
1893 ifp->idev->dev->name);
1898 /* transition from _POSTDAD to _ERRDAD */
1899 ifp->state = INET6_IFADDR_STATE_ERRDAD;
1900 spin_unlock_bh(&ifp->lock);
1902 addrconf_mod_dad_work(ifp, 0);
1905 /* Join to solicited addr multicast group.
1906 * caller must hold RTNL */
1907 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1909 struct in6_addr maddr;
1911 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1914 addrconf_addr_solict_mult(addr, &maddr);
1915 ipv6_dev_mc_inc(dev, &maddr);
1918 /* caller must hold RTNL */
1919 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1921 struct in6_addr maddr;
1923 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1926 addrconf_addr_solict_mult(addr, &maddr);
1927 __ipv6_dev_mc_dec(idev, &maddr);
1930 /* caller must hold RTNL */
1931 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1933 struct in6_addr addr;
1935 if (ifp->prefix_len >= 127) /* RFC 6164 */
1937 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1938 if (ipv6_addr_any(&addr))
1940 __ipv6_dev_ac_inc(ifp->idev, &addr);
1943 /* caller must hold RTNL */
1944 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1946 struct in6_addr addr;
1948 if (ifp->prefix_len >= 127) /* RFC 6164 */
1950 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1951 if (ipv6_addr_any(&addr))
1953 __ipv6_dev_ac_dec(ifp->idev, &addr);
1956 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1958 if (dev->addr_len != IEEE802154_ADDR_LEN)
1960 memcpy(eui, dev->dev_addr, 8);
1965 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1967 union fwnet_hwaddr *ha;
1969 if (dev->addr_len != FWNET_ALEN)
1972 ha = (union fwnet_hwaddr *)dev->dev_addr;
1974 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1979 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1981 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1982 if (dev->addr_len != ARCNET_ALEN)
1985 eui[7] = *(u8 *)dev->dev_addr;
1989 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1991 if (dev->addr_len != INFINIBAND_ALEN)
1993 memcpy(eui, dev->dev_addr + 12, 8);
1998 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
2002 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2003 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2004 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2005 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2006 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2007 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2011 memcpy(eui + 4, &addr, 4);
2015 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2017 if (dev->priv_flags & IFF_ISATAP)
2018 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2022 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2024 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2027 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2029 memcpy(eui, dev->perm_addr, 3);
2030 memcpy(eui + 5, dev->perm_addr + 3, 3);
2037 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2039 switch (dev->type) {
2042 return addrconf_ifid_eui48(eui, dev);
2044 return addrconf_ifid_arcnet(eui, dev);
2045 case ARPHRD_INFINIBAND:
2046 return addrconf_ifid_infiniband(eui, dev);
2048 return addrconf_ifid_sit(eui, dev);
2050 return addrconf_ifid_gre(eui, dev);
2051 case ARPHRD_6LOWPAN:
2052 case ARPHRD_IEEE802154:
2053 return addrconf_ifid_eui64(eui, dev);
2054 case ARPHRD_IEEE1394:
2055 return addrconf_ifid_ieee1394(eui, dev);
2056 case ARPHRD_TUNNEL6:
2057 return addrconf_ifid_ip6tnl(eui, dev);
2062 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2065 struct inet6_ifaddr *ifp;
2067 read_lock_bh(&idev->lock);
2068 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2069 if (ifp->scope > IFA_LINK)
2071 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2072 memcpy(eui, ifp->addr.s6_addr+8, 8);
2077 read_unlock_bh(&idev->lock);
2081 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
2082 static void __ipv6_regen_rndid(struct inet6_dev *idev)
2085 get_random_bytes(idev->rndid, sizeof(idev->rndid));
2086 idev->rndid[0] &= ~0x02;
2089 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2090 * check if generated address is not inappropriate
2092 * - Reserved subnet anycast (RFC 2526)
2093 * 11111101 11....11 1xxxxxxx
2094 * - ISATAP (RFC4214) 6.1
2095 * 00-00-5E-FE-xx-xx-xx-xx
2097 * - XXX: already assigned to an address on the device
2099 if (idev->rndid[0] == 0xfd &&
2100 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2101 (idev->rndid[7]&0x80))
2103 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2104 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2106 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2111 static void ipv6_regen_rndid(unsigned long data)
2113 struct inet6_dev *idev = (struct inet6_dev *) data;
2114 unsigned long expires;
2117 write_lock_bh(&idev->lock);
2122 __ipv6_regen_rndid(idev);
2125 idev->cnf.temp_prefered_lft * HZ -
2126 idev->cnf.regen_max_retry * idev->cnf.dad_transmits *
2127 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) -
2128 idev->cnf.max_desync_factor * HZ;
2129 if (time_before(expires, jiffies)) {
2130 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
2131 __func__, idev->dev->name);
2135 if (!mod_timer(&idev->regen_timer, expires))
2139 write_unlock_bh(&idev->lock);
2140 rcu_read_unlock_bh();
2144 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
2146 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
2147 __ipv6_regen_rndid(idev);
2150 u32 addrconf_rt_table(const struct net_device *dev, u32 default_table) {
2151 /* Determines into what table to put autoconf PIO/RIO/default routes
2152 * learned on this device.
2154 * - If 0, use the same table for every device. This puts routes into
2155 * one of RT_TABLE_{PREFIX,INFO,DFLT} depending on the type of route
2156 * (but note that these three are currently all equal to
2158 * - If > 0, use the specified table.
2159 * - If < 0, put routes into table dev->ifindex + (-rt_table).
2161 struct inet6_dev *idev = in6_dev_get(dev);
2163 int sysctl = idev->cnf.accept_ra_rt_table;
2165 table = default_table;
2166 } else if (sysctl > 0) {
2167 table = (u32) sysctl;
2169 table = (unsigned) dev->ifindex + (-sysctl);
2180 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
2181 unsigned long expires, u32 flags)
2183 struct fib6_config cfg = {
2184 .fc_table = l3mdev_fib_table(dev) ? : addrconf_rt_table(dev, RT6_TABLE_PREFIX),
2185 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2186 .fc_ifindex = dev->ifindex,
2187 .fc_expires = expires,
2189 .fc_flags = RTF_UP | flags,
2190 .fc_nlinfo.nl_net = dev_net(dev),
2191 .fc_protocol = RTPROT_KERNEL,
2196 /* Prevent useless cloning on PtP SIT.
2197 This thing is done here expecting that the whole
2198 class of non-broadcast devices need not cloning.
2200 #if IS_ENABLED(CONFIG_IPV6_SIT)
2201 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2202 cfg.fc_flags |= RTF_NONEXTHOP;
2205 ip6_route_add(&cfg);
2209 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2211 const struct net_device *dev,
2212 u32 flags, u32 noflags)
2214 struct fib6_node *fn;
2215 struct rt6_info *rt = NULL;
2216 struct fib6_table *table;
2217 u32 tb_id = l3mdev_fib_table(dev) ? : addrconf_rt_table(dev, RT6_TABLE_PREFIX);
2219 table = fib6_get_table(dev_net(dev), tb_id);
2223 read_lock_bh(&table->tb6_lock);
2224 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2228 noflags |= RTF_CACHE;
2229 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2230 if (rt->dst.dev->ifindex != dev->ifindex)
2232 if ((rt->rt6i_flags & flags) != flags)
2234 if ((rt->rt6i_flags & noflags) != 0)
2240 read_unlock_bh(&table->tb6_lock);
2245 /* Create "default" multicast route to the interface */
2247 static void addrconf_add_mroute(struct net_device *dev)
2249 struct fib6_config cfg = {
2250 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2251 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2252 .fc_ifindex = dev->ifindex,
2255 .fc_nlinfo.nl_net = dev_net(dev),
2258 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2260 ip6_route_add(&cfg);
2263 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2265 struct inet6_dev *idev;
2269 idev = ipv6_find_idev(dev);
2271 return ERR_PTR(-ENOBUFS);
2273 if (idev->cnf.disable_ipv6)
2274 return ERR_PTR(-EACCES);
2276 /* Add default multicast route */
2277 if (!(dev->flags & IFF_LOOPBACK))
2278 addrconf_add_mroute(dev);
2283 static void manage_tempaddrs(struct inet6_dev *idev,
2284 struct inet6_ifaddr *ifp,
2285 __u32 valid_lft, __u32 prefered_lft,
2286 bool create, unsigned long now)
2289 struct inet6_ifaddr *ift;
2291 read_lock_bh(&idev->lock);
2292 /* update all temporary addresses in the list */
2293 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2294 int age, max_valid, max_prefered;
2296 if (ifp != ift->ifpub)
2299 /* RFC 4941 section 3.3:
2300 * If a received option will extend the lifetime of a public
2301 * address, the lifetimes of temporary addresses should
2302 * be extended, subject to the overall constraint that no
2303 * temporary addresses should ever remain "valid" or "preferred"
2304 * for a time longer than (TEMP_VALID_LIFETIME) or
2305 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2307 age = (now - ift->cstamp) / HZ;
2308 max_valid = idev->cnf.temp_valid_lft - age;
2312 max_prefered = idev->cnf.temp_prefered_lft -
2313 idev->cnf.max_desync_factor - age;
2314 if (max_prefered < 0)
2317 if (valid_lft > max_valid)
2318 valid_lft = max_valid;
2320 if (prefered_lft > max_prefered)
2321 prefered_lft = max_prefered;
2323 spin_lock(&ift->lock);
2325 ift->valid_lft = valid_lft;
2326 ift->prefered_lft = prefered_lft;
2328 if (prefered_lft > 0)
2329 ift->flags &= ~IFA_F_DEPRECATED;
2331 spin_unlock(&ift->lock);
2332 if (!(flags&IFA_F_TENTATIVE))
2333 ipv6_ifa_notify(0, ift);
2336 if ((create || list_empty(&idev->tempaddr_list)) &&
2337 idev->cnf.use_tempaddr > 0) {
2338 /* When a new public address is created as described
2339 * in [ADDRCONF], also create a new temporary address.
2340 * Also create a temporary address if it's enabled but
2341 * no temporary address currently exists.
2343 read_unlock_bh(&idev->lock);
2344 ipv6_create_tempaddr(ifp, NULL);
2346 read_unlock_bh(&idev->lock);
2350 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2352 struct prefix_info *pinfo;
2357 struct inet6_dev *in6_dev;
2358 struct net *net = dev_net(dev);
2360 pinfo = (struct prefix_info *) opt;
2362 if (len < sizeof(struct prefix_info)) {
2363 ADBG("addrconf: prefix option too short\n");
2368 * Validation checks ([ADDRCONF], page 19)
2371 addr_type = ipv6_addr_type(&pinfo->prefix);
2373 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2376 valid_lft = ntohl(pinfo->valid);
2377 prefered_lft = ntohl(pinfo->prefered);
2379 if (prefered_lft > valid_lft) {
2380 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2384 in6_dev = in6_dev_get(dev);
2387 net_dbg_ratelimited("addrconf: device %s not configured\n",
2393 * Two things going on here:
2394 * 1) Add routes for on-link prefixes
2395 * 2) Configure prefixes with the auto flag set
2398 if (pinfo->onlink) {
2399 struct rt6_info *rt;
2400 unsigned long rt_expires;
2402 /* Avoid arithmetic overflow. Really, we could
2403 * save rt_expires in seconds, likely valid_lft,
2404 * but it would require division in fib gc, that it
2408 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2410 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2412 if (addrconf_finite_timeout(rt_expires))
2415 rt = addrconf_get_prefix_route(&pinfo->prefix,
2418 RTF_ADDRCONF | RTF_PREFIX_RT,
2419 RTF_GATEWAY | RTF_DEFAULT);
2422 /* Autoconf prefix route */
2423 if (valid_lft == 0) {
2426 } else if (addrconf_finite_timeout(rt_expires)) {
2428 rt6_set_expires(rt, jiffies + rt_expires);
2430 rt6_clean_expires(rt);
2432 } else if (valid_lft) {
2433 clock_t expires = 0;
2434 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2435 if (addrconf_finite_timeout(rt_expires)) {
2437 flags |= RTF_EXPIRES;
2438 expires = jiffies_to_clock_t(rt_expires);
2440 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2441 dev, expires, flags);
2446 /* Try to figure out our local address for this prefix */
2448 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2449 struct inet6_ifaddr *ifp;
2450 struct in6_addr addr;
2451 int create = 0, update_lft = 0;
2452 bool tokenized = false;
2454 if (pinfo->prefix_len == 64) {
2455 memcpy(&addr, &pinfo->prefix, 8);
2457 if (!ipv6_addr_any(&in6_dev->token)) {
2458 read_lock_bh(&in6_dev->lock);
2459 memcpy(addr.s6_addr + 8,
2460 in6_dev->token.s6_addr + 8, 8);
2461 read_unlock_bh(&in6_dev->lock);
2463 } else if (in6_dev->addr_gen_mode ==
2464 IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
2465 !ipv6_generate_stable_address(&addr, 0,
2467 addr_flags |= IFA_F_STABLE_PRIVACY;
2469 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2470 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2471 in6_dev_put(in6_dev);
2476 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2478 in6_dev_put(in6_dev);
2483 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
2485 if (!ifp && valid_lft) {
2486 int max_addresses = in6_dev->cnf.max_addresses;
2488 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2489 if (in6_dev->cnf.optimistic_dad &&
2490 !net->ipv6.devconf_all->forwarding && sllao)
2491 addr_flags |= IFA_F_OPTIMISTIC;
2494 /* Do not allow to create too much of autoconfigured
2495 * addresses; this would be too easy way to crash kernel.
2497 if (!max_addresses ||
2498 ipv6_count_addresses(in6_dev) < max_addresses)
2499 ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2501 addr_type&IPV6_ADDR_SCOPE_MASK,
2502 addr_flags, valid_lft,
2505 if (IS_ERR_OR_NULL(ifp)) {
2506 in6_dev_put(in6_dev);
2512 spin_lock_bh(&ifp->lock);
2513 ifp->flags |= IFA_F_MANAGETEMPADDR;
2514 ifp->cstamp = jiffies;
2515 ifp->tokenized = tokenized;
2516 spin_unlock_bh(&ifp->lock);
2517 addrconf_dad_start(ifp);
2525 /* update lifetime (RFC2462 5.5.3 e) */
2526 spin_lock_bh(&ifp->lock);
2528 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2529 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2532 if (!update_lft && !create && stored_lft) {
2533 const u32 minimum_lft = min_t(u32,
2534 stored_lft, MIN_VALID_LIFETIME);
2535 valid_lft = max(valid_lft, minimum_lft);
2537 /* RFC4862 Section 5.5.3e:
2538 * "Note that the preferred lifetime of the
2539 * corresponding address is always reset to
2540 * the Preferred Lifetime in the received
2541 * Prefix Information option, regardless of
2542 * whether the valid lifetime is also reset or
2545 * So we should always update prefered_lft here.
2551 ifp->valid_lft = valid_lft;
2552 ifp->prefered_lft = prefered_lft;
2555 ifp->flags &= ~IFA_F_DEPRECATED;
2556 spin_unlock_bh(&ifp->lock);
2558 if (!(flags&IFA_F_TENTATIVE))
2559 ipv6_ifa_notify(0, ifp);
2561 spin_unlock_bh(&ifp->lock);
2563 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2570 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2571 in6_dev_put(in6_dev);
2575 * Set destination address.
2576 * Special case for SIT interfaces where we create a new "virtual"
2579 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2581 struct in6_ifreq ireq;
2582 struct net_device *dev;
2588 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2591 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2597 #if IS_ENABLED(CONFIG_IPV6_SIT)
2598 if (dev->type == ARPHRD_SIT) {
2599 const struct net_device_ops *ops = dev->netdev_ops;
2601 struct ip_tunnel_parm p;
2603 err = -EADDRNOTAVAIL;
2604 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2607 memset(&p, 0, sizeof(p));
2608 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2612 p.iph.protocol = IPPROTO_IPV6;
2614 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2616 if (ops->ndo_do_ioctl) {
2617 mm_segment_t oldfs = get_fs();
2620 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2627 dev = __dev_get_by_name(net, p.name);
2630 err = dev_open(dev);
2640 static int ipv6_mc_config(struct sock *sk, bool join,
2641 const struct in6_addr *addr, int ifindex)
2649 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2651 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2658 * Manual configuration of address on an interface
2660 static int inet6_addr_add(struct net *net, int ifindex,
2661 const struct in6_addr *pfx,
2662 const struct in6_addr *peer_pfx,
2663 unsigned int plen, __u32 ifa_flags,
2664 __u32 prefered_lft, __u32 valid_lft)
2666 struct inet6_ifaddr *ifp;
2667 struct inet6_dev *idev;
2668 struct net_device *dev;
2669 unsigned long timeout;
2679 /* check the lifetime */
2680 if (!valid_lft || prefered_lft > valid_lft)
2683 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2686 dev = __dev_get_by_index(net, ifindex);
2690 idev = addrconf_add_dev(dev);
2692 return PTR_ERR(idev);
2694 if (ifa_flags & IFA_F_MCAUTOJOIN) {
2695 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2696 true, pfx, ifindex);
2702 scope = ipv6_addr_scope(pfx);
2704 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2705 if (addrconf_finite_timeout(timeout)) {
2706 expires = jiffies_to_clock_t(timeout * HZ);
2707 valid_lft = timeout;
2708 flags = RTF_EXPIRES;
2712 ifa_flags |= IFA_F_PERMANENT;
2715 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2716 if (addrconf_finite_timeout(timeout)) {
2718 ifa_flags |= IFA_F_DEPRECATED;
2719 prefered_lft = timeout;
2722 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2723 valid_lft, prefered_lft);
2726 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2727 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2732 * Note that section 3.1 of RFC 4429 indicates
2733 * that the Optimistic flag should not be set for
2734 * manually configured addresses
2736 addrconf_dad_start(ifp);
2737 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2738 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2741 addrconf_verify_rtnl();
2743 } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2744 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2745 false, pfx, ifindex);
2748 return PTR_ERR(ifp);
2751 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2752 const struct in6_addr *pfx, unsigned int plen)
2754 struct inet6_ifaddr *ifp;
2755 struct inet6_dev *idev;
2756 struct net_device *dev;
2761 dev = __dev_get_by_index(net, ifindex);
2765 idev = __in6_dev_get(dev);
2769 read_lock_bh(&idev->lock);
2770 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2771 if (ifp->prefix_len == plen &&
2772 ipv6_addr_equal(pfx, &ifp->addr)) {
2774 read_unlock_bh(&idev->lock);
2776 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2777 (ifa_flags & IFA_F_MANAGETEMPADDR))
2778 manage_tempaddrs(idev, ifp, 0, 0, false,
2781 addrconf_verify_rtnl();
2782 if (ipv6_addr_is_multicast(pfx)) {
2783 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2784 false, pfx, dev->ifindex);
2789 read_unlock_bh(&idev->lock);
2790 return -EADDRNOTAVAIL;
2794 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2796 struct in6_ifreq ireq;
2799 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2802 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2806 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2807 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2808 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2813 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2815 struct in6_ifreq ireq;
2818 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2821 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2825 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
2826 ireq.ifr6_prefixlen);
2831 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2832 int plen, int scope)
2834 struct inet6_ifaddr *ifp;
2836 ifp = ipv6_add_addr(idev, addr, NULL, plen,
2837 scope, IFA_F_PERMANENT,
2838 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2840 spin_lock_bh(&ifp->lock);
2841 ifp->flags &= ~IFA_F_TENTATIVE;
2842 spin_unlock_bh(&ifp->lock);
2843 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2848 #if IS_ENABLED(CONFIG_IPV6_SIT)
2849 static void sit_add_v4_addrs(struct inet6_dev *idev)
2851 struct in6_addr addr;
2852 struct net_device *dev;
2853 struct net *net = dev_net(idev->dev);
2859 memset(&addr, 0, sizeof(struct in6_addr));
2860 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2862 if (idev->dev->flags&IFF_POINTOPOINT) {
2863 addr.s6_addr32[0] = htonl(0xfe800000);
2867 scope = IPV6_ADDR_COMPATv4;
2869 pflags |= RTF_NONEXTHOP;
2872 if (addr.s6_addr32[3]) {
2873 add_addr(idev, &addr, plen, scope);
2874 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
2878 for_each_netdev(net, dev) {
2879 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2880 if (in_dev && (dev->flags & IFF_UP)) {
2881 struct in_ifaddr *ifa;
2885 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2887 addr.s6_addr32[3] = ifa->ifa_local;
2889 if (ifa->ifa_scope == RT_SCOPE_LINK)
2891 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2892 if (idev->dev->flags&IFF_POINTOPOINT)
2897 add_addr(idev, &addr, plen, flag);
2898 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2906 static void init_loopback(struct net_device *dev)
2908 struct inet6_dev *idev;
2909 struct net_device *sp_dev;
2910 struct inet6_ifaddr *sp_ifa;
2911 struct rt6_info *sp_rt;
2917 idev = ipv6_find_idev(dev);
2919 pr_debug("%s: add_dev failed\n", __func__);
2923 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2925 /* Add routes to other interface's IPv6 addresses */
2926 for_each_netdev(dev_net(dev), sp_dev) {
2927 if (!strcmp(sp_dev->name, dev->name))
2930 idev = __in6_dev_get(sp_dev);
2934 read_lock_bh(&idev->lock);
2935 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2937 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2941 /* This dst has been added to garbage list when
2942 * lo device down, release this obsolete dst and
2943 * reallocate a new router for ifa.
2945 if (sp_ifa->rt->dst.obsolete > 0) {
2946 ip6_rt_put(sp_ifa->rt);
2953 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
2955 /* Failure cases are ignored */
2956 if (!IS_ERR(sp_rt)) {
2961 read_unlock_bh(&idev->lock);
2965 static void addrconf_add_linklocal(struct inet6_dev *idev,
2966 const struct in6_addr *addr, u32 flags)
2968 struct inet6_ifaddr *ifp;
2969 u32 addr_flags = flags | IFA_F_PERMANENT;
2971 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2972 if (idev->cnf.optimistic_dad &&
2973 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2974 addr_flags |= IFA_F_OPTIMISTIC;
2977 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
2978 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2980 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2981 addrconf_dad_start(ifp);
2986 static bool ipv6_reserved_interfaceid(struct in6_addr address)
2988 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
2991 if (address.s6_addr32[2] == htonl(0x02005eff) &&
2992 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
2995 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
2996 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3002 static int ipv6_generate_stable_address(struct in6_addr *address,
3004 const struct inet6_dev *idev)
3006 static DEFINE_SPINLOCK(lock);
3007 static __u32 digest[SHA_DIGEST_WORDS];
3008 static __u32 workspace[SHA_WORKSPACE_WORDS];
3011 char __data[SHA_MESSAGE_BYTES];
3013 struct in6_addr secret;
3015 unsigned char hwaddr[MAX_ADDR_LEN];
3020 struct in6_addr secret;
3021 struct in6_addr temp;
3022 struct net *net = dev_net(idev->dev);
3024 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3026 if (idev->cnf.stable_secret.initialized)
3027 secret = idev->cnf.stable_secret.secret;
3028 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3029 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3034 spin_lock_bh(&lock);
3037 memset(&data, 0, sizeof(data));
3038 memset(workspace, 0, sizeof(workspace));
3039 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3040 data.prefix[0] = address->s6_addr32[0];
3041 data.prefix[1] = address->s6_addr32[1];
3042 data.secret = secret;
3043 data.dad_count = dad_count;
3045 sha_transform(digest, data.__data, workspace);
3048 temp.s6_addr32[2] = (__force __be32)digest[0];
3049 temp.s6_addr32[3] = (__force __be32)digest[1];
3051 spin_unlock_bh(&lock);
3053 if (ipv6_reserved_interfaceid(temp)) {
3055 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3064 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3066 struct in6_addr addr;
3068 /* no link local addresses on L3 master devices */
3069 if (netif_is_l3_master(idev->dev))
3072 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3074 if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY) {
3075 if (!ipv6_generate_stable_address(&addr, 0, idev))
3076 addrconf_add_linklocal(idev, &addr,
3077 IFA_F_STABLE_PRIVACY);
3078 else if (prefix_route)
3079 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3080 } else if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) {
3081 /* addrconf_add_linklocal also adds a prefix_route and we
3082 * only need to care about prefix routes if ipv6_generate_eui64
3083 * couldn't generate one.
3085 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3086 addrconf_add_linklocal(idev, &addr, 0);
3087 else if (prefix_route)
3088 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3092 static void addrconf_dev_config(struct net_device *dev)
3094 struct inet6_dev *idev;
3098 if ((dev->type != ARPHRD_ETHER) &&
3099 (dev->type != ARPHRD_FDDI) &&
3100 (dev->type != ARPHRD_ARCNET) &&
3101 (dev->type != ARPHRD_INFINIBAND) &&
3102 (dev->type != ARPHRD_IEEE802154) &&
3103 (dev->type != ARPHRD_IEEE1394) &&
3104 (dev->type != ARPHRD_TUNNEL6) &&
3105 (dev->type != ARPHRD_6LOWPAN)) {
3106 /* Alas, we support only Ethernet autoconfiguration. */
3110 idev = addrconf_add_dev(dev);
3114 addrconf_addr_gen(idev, false);
3117 #if IS_ENABLED(CONFIG_IPV6_SIT)
3118 static void addrconf_sit_config(struct net_device *dev)
3120 struct inet6_dev *idev;
3125 * Configure the tunnel with one of our IPv4
3126 * addresses... we should configure all of
3127 * our v4 addrs in the tunnel
3130 idev = ipv6_find_idev(dev);
3132 pr_debug("%s: add_dev failed\n", __func__);
3136 if (dev->priv_flags & IFF_ISATAP) {
3137 addrconf_addr_gen(idev, false);
3141 sit_add_v4_addrs(idev);
3143 if (dev->flags&IFF_POINTOPOINT)
3144 addrconf_add_mroute(dev);
3148 #if IS_ENABLED(CONFIG_NET_IPGRE)
3149 static void addrconf_gre_config(struct net_device *dev)
3151 struct inet6_dev *idev;
3155 idev = ipv6_find_idev(dev);
3157 pr_debug("%s: add_dev failed\n", __func__);
3161 addrconf_addr_gen(idev, true);
3162 if (dev->flags & IFF_POINTOPOINT)
3163 addrconf_add_mroute(dev);
3167 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3170 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3171 struct inet6_dev *idev = __in6_dev_get(dev);
3172 int run_pending = 0;
3176 case NETDEV_REGISTER:
3177 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3178 idev = ipv6_add_dev(dev);
3180 return notifier_from_errno(PTR_ERR(idev));
3184 case NETDEV_CHANGEMTU:
3185 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3186 if (dev->mtu < IPV6_MIN_MTU) {
3187 addrconf_ifdown(dev, 1);
3192 rt6_mtu_change(dev, dev->mtu);
3193 idev->cnf.mtu6 = dev->mtu;
3197 /* allocate new idev */
3198 idev = ipv6_add_dev(dev);
3202 /* device is still not ready */
3203 if (!(idev->if_flags & IF_READY))
3212 if (dev->flags & IFF_SLAVE)
3215 if (idev && idev->cnf.disable_ipv6)
3218 if (event == NETDEV_UP) {
3219 if (!addrconf_qdisc_ok(dev)) {
3220 /* device is not ready yet. */
3221 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3226 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3227 idev = ipv6_add_dev(dev);
3229 if (!IS_ERR_OR_NULL(idev)) {
3230 idev->if_flags |= IF_READY;
3233 } else if (event == NETDEV_CHANGE) {
3234 if (!addrconf_qdisc_ok(dev)) {
3235 /* device is still not ready. */
3240 if (idev->if_flags & IF_READY)
3241 /* device is already configured. */
3243 idev->if_flags |= IF_READY;
3246 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3252 switch (dev->type) {
3253 #if IS_ENABLED(CONFIG_IPV6_SIT)
3255 addrconf_sit_config(dev);
3258 #if IS_ENABLED(CONFIG_NET_IPGRE)
3260 addrconf_gre_config(dev);
3263 case ARPHRD_LOOPBACK:
3268 addrconf_dev_config(dev);
3272 if (!IS_ERR_OR_NULL(idev)) {
3274 addrconf_dad_run(idev);
3277 * If the MTU changed during the interface down,
3278 * when the interface up, the changed MTU must be
3279 * reflected in the idev as well as routers.
3281 if (idev->cnf.mtu6 != dev->mtu &&
3282 dev->mtu >= IPV6_MIN_MTU) {
3283 rt6_mtu_change(dev, dev->mtu);
3284 idev->cnf.mtu6 = dev->mtu;
3286 idev->tstamp = jiffies;
3287 inet6_ifinfo_notify(RTM_NEWLINK, idev);
3290 * If the changed mtu during down is lower than
3291 * IPV6_MIN_MTU stop IPv6 on this interface.
3293 if (dev->mtu < IPV6_MIN_MTU)
3294 addrconf_ifdown(dev, 1);
3299 case NETDEV_UNREGISTER:
3301 * Remove all addresses from this interface.
3303 addrconf_ifdown(dev, event != NETDEV_DOWN);
3306 case NETDEV_CHANGENAME:
3308 snmp6_unregister_dev(idev);
3309 addrconf_sysctl_unregister(idev);
3310 err = addrconf_sysctl_register(idev);
3312 return notifier_from_errno(err);
3313 err = snmp6_register_dev(idev);
3315 addrconf_sysctl_unregister(idev);
3316 return notifier_from_errno(err);
3321 case NETDEV_PRE_TYPE_CHANGE:
3322 case NETDEV_POST_TYPE_CHANGE:
3323 addrconf_type_change(dev, event);
3331 * addrconf module should be notified of a device going up
3333 static struct notifier_block ipv6_dev_notf = {
3334 .notifier_call = addrconf_notify,
3337 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3339 struct inet6_dev *idev;
3342 idev = __in6_dev_get(dev);
3344 if (event == NETDEV_POST_TYPE_CHANGE)
3345 ipv6_mc_remap(idev);
3346 else if (event == NETDEV_PRE_TYPE_CHANGE)
3347 ipv6_mc_unmap(idev);
3350 static int addrconf_ifdown(struct net_device *dev, int how)
3352 struct net *net = dev_net(dev);
3353 struct inet6_dev *idev;
3354 struct inet6_ifaddr *ifa;
3359 rt6_ifdown(net, dev);
3360 neigh_ifdown(&nd_tbl, dev);
3362 idev = __in6_dev_get(dev);
3367 * Step 1: remove reference to ipv6 device from parent device.
3373 /* protected by rtnl_lock */
3374 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3376 /* Step 1.5: remove snmp6 entry */
3377 snmp6_unregister_dev(idev);
3381 /* Step 2: clear hash table */
3382 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3383 struct hlist_head *h = &inet6_addr_lst[i];
3385 spin_lock_bh(&addrconf_hash_lock);
3387 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3388 if (ifa->idev == idev) {
3389 hlist_del_init_rcu(&ifa->addr_lst);
3390 addrconf_del_dad_work(ifa);
3394 spin_unlock_bh(&addrconf_hash_lock);
3397 write_lock_bh(&idev->lock);
3399 addrconf_del_rs_timer(idev);
3401 /* Step 2: clear flags for stateless addrconf */
3403 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3405 if (how && del_timer(&idev->regen_timer))
3408 /* Step 3: clear tempaddr list */
3409 while (!list_empty(&idev->tempaddr_list)) {
3410 ifa = list_first_entry(&idev->tempaddr_list,
3411 struct inet6_ifaddr, tmp_list);
3412 list_del(&ifa->tmp_list);
3413 write_unlock_bh(&idev->lock);
3414 spin_lock_bh(&ifa->lock);
3417 in6_ifa_put(ifa->ifpub);
3420 spin_unlock_bh(&ifa->lock);
3422 write_lock_bh(&idev->lock);
3425 while (!list_empty(&idev->addr_list)) {
3426 ifa = list_first_entry(&idev->addr_list,
3427 struct inet6_ifaddr, if_list);
3428 addrconf_del_dad_work(ifa);
3430 list_del(&ifa->if_list);
3432 write_unlock_bh(&idev->lock);
3434 spin_lock_bh(&ifa->lock);
3436 ifa->state = INET6_IFADDR_STATE_DEAD;
3437 spin_unlock_bh(&ifa->lock);
3439 if (state != INET6_IFADDR_STATE_DEAD) {
3440 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3441 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3445 write_lock_bh(&idev->lock);
3448 write_unlock_bh(&idev->lock);
3450 /* Step 5: Discard anycast and multicast list */
3452 ipv6_ac_destroy_dev(idev);
3453 ipv6_mc_destroy_dev(idev);
3458 idev->tstamp = jiffies;
3460 /* Last: Shot the device (if unregistered) */
3462 addrconf_sysctl_unregister(idev);
3463 neigh_parms_release(&nd_tbl, idev->nd_parms);
3464 neigh_ifdown(&nd_tbl, dev);
3470 static void addrconf_rs_timer(unsigned long data)
3472 struct inet6_dev *idev = (struct inet6_dev *)data;
3473 struct net_device *dev = idev->dev;
3474 struct in6_addr lladdr;
3476 write_lock(&idev->lock);
3477 if (idev->dead || !(idev->if_flags & IF_READY))
3480 if (!ipv6_accept_ra(idev))
3483 /* Announcement received after solicitation was sent */
3484 if (idev->if_flags & IF_RA_RCVD)
3487 if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
3488 write_unlock(&idev->lock);
3489 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3490 ndisc_send_rs(dev, &lladdr,
3491 &in6addr_linklocal_allrouters);
3495 write_lock(&idev->lock);
3496 /* The wait after the last probe can be shorter */
3497 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3498 idev->cnf.rtr_solicits) ?
3499 idev->cnf.rtr_solicit_delay :
3500 idev->cnf.rtr_solicit_interval);
3503 * Note: we do not support deprecated "all on-link"
3504 * assumption any longer.
3506 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3510 write_unlock(&idev->lock);
3516 * Duplicate Address Detection
3518 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3520 unsigned long rand_num;
3521 struct inet6_dev *idev = ifp->idev;
3523 if (ifp->flags & IFA_F_OPTIMISTIC)
3526 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3528 ifp->dad_probes = idev->cnf.dad_transmits;
3529 addrconf_mod_dad_work(ifp, rand_num);
3532 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3534 struct inet6_dev *idev = ifp->idev;
3535 struct net_device *dev = idev->dev;
3536 bool notify = false;
3538 addrconf_join_solict(dev, &ifp->addr);
3540 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3542 read_lock_bh(&idev->lock);
3543 spin_lock(&ifp->lock);
3544 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3547 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3548 idev->cnf.accept_dad < 1 ||
3549 !(ifp->flags&IFA_F_TENTATIVE) ||
3550 ifp->flags & IFA_F_NODAD) {
3551 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3552 spin_unlock(&ifp->lock);
3553 read_unlock_bh(&idev->lock);
3555 addrconf_dad_completed(ifp);
3559 if (!(idev->if_flags & IF_READY)) {
3560 spin_unlock(&ifp->lock);
3561 read_unlock_bh(&idev->lock);
3563 * If the device is not ready:
3564 * - keep it tentative if it is a permanent address.
3565 * - otherwise, kill it.
3568 addrconf_dad_stop(ifp, 0);
3573 * Optimistic nodes can start receiving
3576 if (ifp->flags & IFA_F_OPTIMISTIC) {
3577 ip6_ins_rt(ifp->rt);
3578 if (ipv6_use_optimistic_addr(idev)) {
3579 /* Because optimistic nodes can use this address,
3580 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3586 addrconf_dad_kick(ifp);
3588 spin_unlock(&ifp->lock);
3589 read_unlock_bh(&idev->lock);
3591 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3594 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3596 bool begin_dad = false;
3598 spin_lock_bh(&ifp->lock);
3599 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3600 ifp->state = INET6_IFADDR_STATE_PREDAD;
3603 spin_unlock_bh(&ifp->lock);
3606 addrconf_mod_dad_work(ifp, 0);
3609 static void addrconf_dad_work(struct work_struct *w)
3611 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3612 struct inet6_ifaddr,
3614 struct inet6_dev *idev = ifp->idev;
3615 struct in6_addr mcaddr;
3621 } action = DAD_PROCESS;
3625 spin_lock_bh(&ifp->lock);
3626 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3628 ifp->state = INET6_IFADDR_STATE_DAD;
3629 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3631 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3633 spin_unlock_bh(&ifp->lock);
3635 if (action == DAD_BEGIN) {
3636 addrconf_dad_begin(ifp);
3638 } else if (action == DAD_ABORT) {
3639 addrconf_dad_stop(ifp, 1);
3643 if (!ifp->dad_probes && addrconf_dad_end(ifp))
3646 write_lock_bh(&idev->lock);
3647 if (idev->dead || !(idev->if_flags & IF_READY)) {
3648 write_unlock_bh(&idev->lock);
3652 spin_lock(&ifp->lock);
3653 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3654 spin_unlock(&ifp->lock);
3655 write_unlock_bh(&idev->lock);
3659 if (ifp->dad_probes == 0) {
3661 * DAD was successful
3664 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3665 spin_unlock(&ifp->lock);
3666 write_unlock_bh(&idev->lock);
3668 addrconf_dad_completed(ifp);
3674 addrconf_mod_dad_work(ifp,
3675 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
3676 spin_unlock(&ifp->lock);
3677 write_unlock_bh(&idev->lock);
3679 /* send a neighbour solicitation for our addr */
3680 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3681 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any);
3687 /* ifp->idev must be at least read locked */
3688 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3690 struct inet6_ifaddr *ifpiter;
3691 struct inet6_dev *idev = ifp->idev;
3693 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3694 if (ifpiter->scope > IFA_LINK)
3696 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3697 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3698 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3705 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3707 struct net_device *dev = ifp->idev->dev;
3708 struct in6_addr lladdr;
3709 bool send_rs, send_mld;
3711 addrconf_del_dad_work(ifp);
3714 * Configure the address for reception. Now it is valid.
3717 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3719 /* If added prefix is link local and we are prepared to process
3720 router advertisements, start sending router solicitations.
3723 read_lock_bh(&ifp->idev->lock);
3724 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
3725 send_rs = send_mld &&
3726 ipv6_accept_ra(ifp->idev) &&
3727 ifp->idev->cnf.rtr_solicits > 0 &&
3728 (dev->flags&IFF_LOOPBACK) == 0;
3729 read_unlock_bh(&ifp->idev->lock);
3731 /* While dad is in progress mld report's source address is in6_addrany.
3732 * Resend with proper ll now.
3735 ipv6_mc_dad_complete(ifp->idev);
3739 * If a host as already performed a random delay
3740 * [...] as part of DAD [...] there is no need
3741 * to delay again before sending the first RS
3743 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3745 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
3747 write_lock_bh(&ifp->idev->lock);
3748 spin_lock(&ifp->lock);
3749 ifp->idev->rs_probes = 1;
3750 ifp->idev->if_flags |= IF_RS_SENT;
3751 addrconf_mod_rs_timer(ifp->idev,
3752 ifp->idev->cnf.rtr_solicit_interval);
3753 spin_unlock(&ifp->lock);
3754 write_unlock_bh(&ifp->idev->lock);
3758 static void addrconf_dad_run(struct inet6_dev *idev)
3760 struct inet6_ifaddr *ifp;
3762 read_lock_bh(&idev->lock);
3763 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3764 spin_lock(&ifp->lock);
3765 if (ifp->flags & IFA_F_TENTATIVE &&
3766 ifp->state == INET6_IFADDR_STATE_DAD)
3767 addrconf_dad_kick(ifp);
3768 spin_unlock(&ifp->lock);
3770 read_unlock_bh(&idev->lock);
3773 #ifdef CONFIG_PROC_FS
3774 struct if6_iter_state {
3775 struct seq_net_private p;
3780 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3782 struct inet6_ifaddr *ifa = NULL;
3783 struct if6_iter_state *state = seq->private;
3784 struct net *net = seq_file_net(seq);
3787 /* initial bucket if pos is 0 */
3793 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3794 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
3796 if (!net_eq(dev_net(ifa->idev->dev), net))
3798 /* sync with offset */
3799 if (p < state->offset) {
3807 /* prepare for next bucket */
3814 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3815 struct inet6_ifaddr *ifa)
3817 struct if6_iter_state *state = seq->private;
3818 struct net *net = seq_file_net(seq);
3820 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
3821 if (!net_eq(dev_net(ifa->idev->dev), net))
3827 while (++state->bucket < IN6_ADDR_HSIZE) {
3829 hlist_for_each_entry_rcu_bh(ifa,
3830 &inet6_addr_lst[state->bucket], addr_lst) {
3831 if (!net_eq(dev_net(ifa->idev->dev), net))
3841 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3845 return if6_get_first(seq, *pos);
3848 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3850 struct inet6_ifaddr *ifa;
3852 ifa = if6_get_next(seq, v);
3857 static void if6_seq_stop(struct seq_file *seq, void *v)
3860 rcu_read_unlock_bh();
3863 static int if6_seq_show(struct seq_file *seq, void *v)
3865 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3866 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3868 ifp->idev->dev->ifindex,
3872 ifp->idev->dev->name);
3876 static const struct seq_operations if6_seq_ops = {
3877 .start = if6_seq_start,
3878 .next = if6_seq_next,
3879 .show = if6_seq_show,
3880 .stop = if6_seq_stop,
3883 static int if6_seq_open(struct inode *inode, struct file *file)
3885 return seq_open_net(inode, file, &if6_seq_ops,
3886 sizeof(struct if6_iter_state));
3889 static const struct file_operations if6_fops = {
3890 .owner = THIS_MODULE,
3891 .open = if6_seq_open,
3893 .llseek = seq_lseek,
3894 .release = seq_release_net,
3897 static int __net_init if6_proc_net_init(struct net *net)
3899 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
3904 static void __net_exit if6_proc_net_exit(struct net *net)
3906 remove_proc_entry("if_inet6", net->proc_net);
3909 static struct pernet_operations if6_proc_net_ops = {
3910 .init = if6_proc_net_init,
3911 .exit = if6_proc_net_exit,
3914 int __init if6_proc_init(void)
3916 return register_pernet_subsys(&if6_proc_net_ops);
3919 void if6_proc_exit(void)
3921 unregister_pernet_subsys(&if6_proc_net_ops);
3923 #endif /* CONFIG_PROC_FS */
3925 #if IS_ENABLED(CONFIG_IPV6_MIP6)
3926 /* Check if address is a home address configured on any interface. */
3927 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3930 struct inet6_ifaddr *ifp = NULL;
3931 unsigned int hash = inet6_addr_hash(addr);
3934 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
3935 if (!net_eq(dev_net(ifp->idev->dev), net))
3937 if (ipv6_addr_equal(&ifp->addr, addr) &&
3938 (ifp->flags & IFA_F_HOMEADDRESS)) {
3943 rcu_read_unlock_bh();
3949 * Periodic address status verification
3952 static void addrconf_verify_rtnl(void)
3954 unsigned long now, next, next_sec, next_sched;
3955 struct inet6_ifaddr *ifp;
3962 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3964 cancel_delayed_work(&addr_chk_work);
3966 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3968 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
3971 /* When setting preferred_lft to a value not zero or
3972 * infinity, while valid_lft is infinity
3973 * IFA_F_PERMANENT has a non-infinity life time.
3975 if ((ifp->flags & IFA_F_PERMANENT) &&
3976 (ifp->prefered_lft == INFINITY_LIFE_TIME))
3979 spin_lock(&ifp->lock);
3980 /* We try to batch several events at once. */
3981 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3983 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3984 age >= ifp->valid_lft) {
3985 spin_unlock(&ifp->lock);
3989 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3990 spin_unlock(&ifp->lock);
3992 } else if (age >= ifp->prefered_lft) {
3993 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3996 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3998 ifp->flags |= IFA_F_DEPRECATED;
4001 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4002 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
4003 next = ifp->tstamp + ifp->valid_lft * HZ;
4005 spin_unlock(&ifp->lock);
4010 ipv6_ifa_notify(0, ifp);
4014 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4015 !(ifp->flags&IFA_F_TENTATIVE)) {
4016 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4017 ifp->idev->cnf.dad_transmits *
4018 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
4020 if (age >= ifp->prefered_lft - regen_advance) {
4021 struct inet6_ifaddr *ifpub = ifp->ifpub;
4022 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4023 next = ifp->tstamp + ifp->prefered_lft * HZ;
4024 if (!ifp->regen_count && ifpub) {
4027 in6_ifa_hold(ifpub);
4028 spin_unlock(&ifp->lock);
4030 spin_lock(&ifpub->lock);
4031 ifpub->regen_count = 0;
4032 spin_unlock(&ifpub->lock);
4033 ipv6_create_tempaddr(ifpub, ifp);
4038 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4039 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4040 spin_unlock(&ifp->lock);
4042 /* ifp->prefered_lft <= ifp->valid_lft */
4043 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4044 next = ifp->tstamp + ifp->prefered_lft * HZ;
4045 spin_unlock(&ifp->lock);
4050 next_sec = round_jiffies_up(next);
4053 /* If rounded timeout is accurate enough, accept it. */
4054 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4055 next_sched = next_sec;
4057 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4058 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4059 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4061 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4062 now, next, next_sec, next_sched);
4063 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
4064 rcu_read_unlock_bh();
4067 static void addrconf_verify_work(struct work_struct *w)
4070 addrconf_verify_rtnl();
4074 static void addrconf_verify(void)
4076 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4079 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4080 struct in6_addr **peer_pfx)
4082 struct in6_addr *pfx = NULL;
4087 pfx = nla_data(addr);
4090 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4092 pfx = nla_data(local);
4098 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4099 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4100 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4101 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
4102 [IFA_FLAGS] = { .len = sizeof(u32) },
4106 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
4108 struct net *net = sock_net(skb->sk);
4109 struct ifaddrmsg *ifm;
4110 struct nlattr *tb[IFA_MAX+1];
4111 struct in6_addr *pfx, *peer_pfx;
4115 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4119 ifm = nlmsg_data(nlh);
4120 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4124 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4126 /* We ignore other flags so far. */
4127 ifa_flags &= IFA_F_MANAGETEMPADDR;
4129 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4130 ifm->ifa_prefixlen);
4133 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
4134 u32 prefered_lft, u32 valid_lft)
4138 unsigned long timeout;
4139 bool was_managetempaddr;
4140 bool had_prefixroute;
4144 if (!valid_lft || (prefered_lft > valid_lft))
4147 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4148 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4151 timeout = addrconf_timeout_fixup(valid_lft, HZ);
4152 if (addrconf_finite_timeout(timeout)) {
4153 expires = jiffies_to_clock_t(timeout * HZ);
4154 valid_lft = timeout;
4155 flags = RTF_EXPIRES;
4159 ifa_flags |= IFA_F_PERMANENT;
4162 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4163 if (addrconf_finite_timeout(timeout)) {
4165 ifa_flags |= IFA_F_DEPRECATED;
4166 prefered_lft = timeout;
4169 spin_lock_bh(&ifp->lock);
4170 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4171 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4172 !(ifp->flags & IFA_F_NOPREFIXROUTE);
4173 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4174 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4175 IFA_F_NOPREFIXROUTE);
4176 ifp->flags |= ifa_flags;
4177 ifp->tstamp = jiffies;
4178 ifp->valid_lft = valid_lft;
4179 ifp->prefered_lft = prefered_lft;
4181 spin_unlock_bh(&ifp->lock);
4182 if (!(ifp->flags&IFA_F_TENTATIVE))
4183 ipv6_ifa_notify(0, ifp);
4185 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4186 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4188 } else if (had_prefixroute) {
4189 enum cleanup_prefix_rt_t action;
4190 unsigned long rt_expires;
4192 write_lock_bh(&ifp->idev->lock);
4193 action = check_cleanup_prefix_route(ifp, &rt_expires);
4194 write_unlock_bh(&ifp->idev->lock);
4196 if (action != CLEANUP_PREFIX_RT_NOP) {
4197 cleanup_prefix_route(ifp, rt_expires,
4198 action == CLEANUP_PREFIX_RT_DEL);
4202 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4203 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4204 valid_lft = prefered_lft = 0;
4205 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4206 !was_managetempaddr, jiffies);
4209 addrconf_verify_rtnl();
4215 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
4217 struct net *net = sock_net(skb->sk);
4218 struct ifaddrmsg *ifm;
4219 struct nlattr *tb[IFA_MAX+1];
4220 struct in6_addr *pfx, *peer_pfx;
4221 struct inet6_ifaddr *ifa;
4222 struct net_device *dev;
4223 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
4227 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4231 ifm = nlmsg_data(nlh);
4232 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4236 if (tb[IFA_CACHEINFO]) {
4237 struct ifa_cacheinfo *ci;
4239 ci = nla_data(tb[IFA_CACHEINFO]);
4240 valid_lft = ci->ifa_valid;
4241 preferred_lft = ci->ifa_prefered;
4243 preferred_lft = INFINITY_LIFE_TIME;
4244 valid_lft = INFINITY_LIFE_TIME;
4247 dev = __dev_get_by_index(net, ifm->ifa_index);
4251 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4253 /* We ignore other flags so far. */
4254 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4255 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
4257 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
4260 * It would be best to check for !NLM_F_CREATE here but
4261 * userspace already relies on not having to provide this.
4263 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
4264 ifm->ifa_prefixlen, ifa_flags,
4265 preferred_lft, valid_lft);
4268 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4269 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4272 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
4279 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4280 u8 scope, int ifindex)
4282 struct ifaddrmsg *ifm;
4284 ifm = nlmsg_data(nlh);
4285 ifm->ifa_family = AF_INET6;
4286 ifm->ifa_prefixlen = prefixlen;
4287 ifm->ifa_flags = flags;
4288 ifm->ifa_scope = scope;
4289 ifm->ifa_index = ifindex;
4292 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4293 unsigned long tstamp, u32 preferred, u32 valid)
4295 struct ifa_cacheinfo ci;
4297 ci.cstamp = cstamp_delta(cstamp);
4298 ci.tstamp = cstamp_delta(tstamp);
4299 ci.ifa_prefered = preferred;
4300 ci.ifa_valid = valid;
4302 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4305 static inline int rt_scope(int ifa_scope)
4307 if (ifa_scope & IFA_HOST)
4308 return RT_SCOPE_HOST;
4309 else if (ifa_scope & IFA_LINK)
4310 return RT_SCOPE_LINK;
4311 else if (ifa_scope & IFA_SITE)
4312 return RT_SCOPE_SITE;
4314 return RT_SCOPE_UNIVERSE;
4317 static inline int inet6_ifaddr_msgsize(void)
4319 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4320 + nla_total_size(16) /* IFA_LOCAL */
4321 + nla_total_size(16) /* IFA_ADDRESS */
4322 + nla_total_size(sizeof(struct ifa_cacheinfo))
4323 + nla_total_size(4) /* IFA_FLAGS */;
4326 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
4327 u32 portid, u32 seq, int event, unsigned int flags)
4329 struct nlmsghdr *nlh;
4330 u32 preferred, valid;
4332 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4336 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4337 ifa->idev->dev->ifindex);
4339 if (!((ifa->flags&IFA_F_PERMANENT) &&
4340 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
4341 preferred = ifa->prefered_lft;
4342 valid = ifa->valid_lft;
4343 if (preferred != INFINITY_LIFE_TIME) {
4344 long tval = (jiffies - ifa->tstamp)/HZ;
4345 if (preferred > tval)
4349 if (valid != INFINITY_LIFE_TIME) {
4357 preferred = INFINITY_LIFE_TIME;
4358 valid = INFINITY_LIFE_TIME;
4361 if (!ipv6_addr_any(&ifa->peer_addr)) {
4362 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4363 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
4366 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
4369 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4372 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4375 nlmsg_end(skb, nlh);
4379 nlmsg_cancel(skb, nlh);
4383 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
4384 u32 portid, u32 seq, int event, u16 flags)
4386 struct nlmsghdr *nlh;
4387 u8 scope = RT_SCOPE_UNIVERSE;
4388 int ifindex = ifmca->idev->dev->ifindex;
4390 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4391 scope = RT_SCOPE_SITE;
4393 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4397 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4398 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
4399 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
4400 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4401 nlmsg_cancel(skb, nlh);
4405 nlmsg_end(skb, nlh);
4409 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
4410 u32 portid, u32 seq, int event, unsigned int flags)
4412 struct nlmsghdr *nlh;
4413 u8 scope = RT_SCOPE_UNIVERSE;
4414 int ifindex = ifaca->aca_idev->dev->ifindex;
4416 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4417 scope = RT_SCOPE_SITE;
4419 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4423 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4424 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
4425 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
4426 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4427 nlmsg_cancel(skb, nlh);
4431 nlmsg_end(skb, nlh);
4441 /* called with rcu_read_lock() */
4442 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4443 struct netlink_callback *cb, enum addr_type_t type,
4444 int s_ip_idx, int *p_ip_idx)
4446 struct ifmcaddr6 *ifmca;
4447 struct ifacaddr6 *ifaca;
4449 int ip_idx = *p_ip_idx;
4451 read_lock_bh(&idev->lock);
4453 case UNICAST_ADDR: {
4454 struct inet6_ifaddr *ifa;
4456 /* unicast address incl. temp addr */
4457 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4458 if (++ip_idx < s_ip_idx)
4460 err = inet6_fill_ifaddr(skb, ifa,
4461 NETLINK_CB(cb->skb).portid,
4467 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4471 case MULTICAST_ADDR:
4472 /* multicast address */
4473 for (ifmca = idev->mc_list; ifmca;
4474 ifmca = ifmca->next, ip_idx++) {
4475 if (ip_idx < s_ip_idx)
4477 err = inet6_fill_ifmcaddr(skb, ifmca,
4478 NETLINK_CB(cb->skb).portid,
4487 /* anycast address */
4488 for (ifaca = idev->ac_list; ifaca;
4489 ifaca = ifaca->aca_next, ip_idx++) {
4490 if (ip_idx < s_ip_idx)
4492 err = inet6_fill_ifacaddr(skb, ifaca,
4493 NETLINK_CB(cb->skb).portid,
4504 read_unlock_bh(&idev->lock);
4509 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4510 enum addr_type_t type)
4512 struct net *net = sock_net(skb->sk);
4515 int s_idx, s_ip_idx;
4516 struct net_device *dev;
4517 struct inet6_dev *idev;
4518 struct hlist_head *head;
4521 s_idx = idx = cb->args[1];
4522 s_ip_idx = ip_idx = cb->args[2];
4525 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4526 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4528 head = &net->dev_index_head[h];
4529 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4532 if (h > s_h || idx > s_idx)
4535 idev = __in6_dev_get(dev);
4539 if (in6_dump_addrs(idev, skb, cb, type,
4540 s_ip_idx, &ip_idx) < 0)
4550 cb->args[2] = ip_idx;
4555 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4557 enum addr_type_t type = UNICAST_ADDR;
4559 return inet6_dump_addr(skb, cb, type);
4562 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4564 enum addr_type_t type = MULTICAST_ADDR;
4566 return inet6_dump_addr(skb, cb, type);
4570 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4572 enum addr_type_t type = ANYCAST_ADDR;
4574 return inet6_dump_addr(skb, cb, type);
4577 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
4579 struct net *net = sock_net(in_skb->sk);
4580 struct ifaddrmsg *ifm;
4581 struct nlattr *tb[IFA_MAX+1];
4582 struct in6_addr *addr = NULL, *peer;
4583 struct net_device *dev = NULL;
4584 struct inet6_ifaddr *ifa;
4585 struct sk_buff *skb;
4588 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4592 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4598 ifm = nlmsg_data(nlh);
4600 dev = __dev_get_by_index(net, ifm->ifa_index);
4602 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4604 err = -EADDRNOTAVAIL;
4608 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4614 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4615 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4617 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4618 WARN_ON(err == -EMSGSIZE);
4622 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4629 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4631 struct sk_buff *skb;
4632 struct net *net = dev_net(ifa->idev->dev);
4635 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4639 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4641 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4642 WARN_ON(err == -EMSGSIZE);
4646 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4650 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4653 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4654 __s32 *array, int bytes)
4656 BUG_ON(bytes < (DEVCONF_MAX * 4));
4658 memset(array, 0, bytes);
4659 array[DEVCONF_FORWARDING] = cnf->forwarding;
4660 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4661 array[DEVCONF_MTU6] = cnf->mtu6;
4662 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4663 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4664 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4665 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4666 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4667 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4668 jiffies_to_msecs(cnf->rtr_solicit_interval);
4669 array[DEVCONF_RTR_SOLICIT_DELAY] =
4670 jiffies_to_msecs(cnf->rtr_solicit_delay);
4671 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4672 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4673 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4674 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4675 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
4676 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4677 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4678 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4679 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4680 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4681 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4682 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4683 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
4684 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4685 #ifdef CONFIG_IPV6_ROUTER_PREF
4686 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4687 array[DEVCONF_RTR_PROBE_INTERVAL] =
4688 jiffies_to_msecs(cnf->rtr_probe_interval);
4689 #ifdef CONFIG_IPV6_ROUTE_INFO
4690 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4693 array[DEVCONF_ACCEPT_RA_RT_TABLE] = cnf->accept_ra_rt_table;
4694 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4695 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4696 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4697 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4698 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
4700 #ifdef CONFIG_IPV6_MROUTE
4701 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4703 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4704 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4705 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4706 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4707 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
4708 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
4709 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
4710 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
4711 /* we omit DEVCONF_STABLE_SECRET for now */
4712 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
4715 static inline size_t inet6_ifla6_size(void)
4717 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4718 + nla_total_size(sizeof(struct ifla_cacheinfo))
4719 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4720 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4721 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4722 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
4725 static inline size_t inet6_if_nlmsg_size(void)
4727 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4728 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4729 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4730 + nla_total_size(4) /* IFLA_MTU */
4731 + nla_total_size(4) /* IFLA_LINK */
4732 + nla_total_size(1) /* IFLA_OPERSTATE */
4733 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4736 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4737 int items, int bytes)
4740 int pad = bytes - sizeof(u64) * items;
4743 /* Use put_unaligned() because stats may not be aligned for u64. */
4744 put_unaligned(items, &stats[0]);
4745 for (i = 1; i < items; i++)
4746 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4748 memset(&stats[items], 0, pad);
4751 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
4752 int bytes, size_t syncpoff)
4755 u64 buff[IPSTATS_MIB_MAX];
4756 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
4760 memset(buff, 0, sizeof(buff));
4761 buff[0] = IPSTATS_MIB_MAX;
4763 for_each_possible_cpu(c) {
4764 for (i = 1; i < IPSTATS_MIB_MAX; i++)
4765 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
4768 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
4769 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
4772 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4776 case IFLA_INET6_STATS:
4777 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
4778 offsetof(struct ipstats_mib, syncp));
4780 case IFLA_INET6_ICMP6STATS:
4781 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
4786 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
4787 u32 ext_filter_mask)
4790 struct ifla_cacheinfo ci;
4792 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4793 goto nla_put_failure;
4794 ci.max_reasm_len = IPV6_MAXPLEN;
4795 ci.tstamp = cstamp_delta(idev->tstamp);
4796 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4797 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
4798 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4799 goto nla_put_failure;
4800 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4802 goto nla_put_failure;
4803 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4805 /* XXX - MC not implemented */
4807 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
4810 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4812 goto nla_put_failure;
4813 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4815 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4817 goto nla_put_failure;
4818 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4820 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4822 goto nla_put_failure;
4824 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode))
4825 goto nla_put_failure;
4827 read_lock_bh(&idev->lock);
4828 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4829 read_unlock_bh(&idev->lock);
4837 static size_t inet6_get_link_af_size(const struct net_device *dev,
4838 u32 ext_filter_mask)
4840 if (!__in6_dev_get(dev))
4843 return inet6_ifla6_size();
4846 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
4847 u32 ext_filter_mask)
4849 struct inet6_dev *idev = __in6_dev_get(dev);
4854 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
4860 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4862 struct inet6_ifaddr *ifp;
4863 struct net_device *dev = idev->dev;
4864 bool update_rs = false;
4865 struct in6_addr ll_addr;
4871 if (ipv6_addr_any(token))
4873 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4875 if (!ipv6_accept_ra(idev))
4877 if (idev->cnf.rtr_solicits <= 0)
4880 write_lock_bh(&idev->lock);
4882 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4883 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4885 write_unlock_bh(&idev->lock);
4887 if (!idev->dead && (idev->if_flags & IF_READY) &&
4888 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4889 IFA_F_OPTIMISTIC)) {
4891 /* If we're not ready, then normal ifup will take care
4892 * of this. Otherwise, we need to request our rs here.
4894 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4898 write_lock_bh(&idev->lock);
4901 idev->if_flags |= IF_RS_SENT;
4902 idev->rs_probes = 1;
4903 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
4906 /* Well, that's kinda nasty ... */
4907 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4908 spin_lock(&ifp->lock);
4909 if (ifp->tokenized) {
4911 ifp->prefered_lft = 0;
4913 spin_unlock(&ifp->lock);
4916 write_unlock_bh(&idev->lock);
4917 inet6_ifinfo_notify(RTM_NEWLINK, idev);
4918 addrconf_verify_rtnl();
4922 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
4923 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
4924 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
4927 static int inet6_validate_link_af(const struct net_device *dev,
4928 const struct nlattr *nla)
4930 struct nlattr *tb[IFLA_INET6_MAX + 1];
4932 if (dev && !__in6_dev_get(dev))
4933 return -EAFNOSUPPORT;
4935 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy);
4938 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4941 struct inet6_dev *idev = __in6_dev_get(dev);
4942 struct nlattr *tb[IFLA_INET6_MAX + 1];
4945 return -EAFNOSUPPORT;
4947 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4950 if (tb[IFLA_INET6_TOKEN]) {
4951 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
4956 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
4957 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
4959 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
4960 mode != IN6_ADDR_GEN_MODE_NONE &&
4961 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY)
4964 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
4965 !idev->cnf.stable_secret.initialized &&
4966 !dev_net(dev)->ipv6.devconf_dflt->stable_secret.initialized)
4969 idev->addr_gen_mode = mode;
4976 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4977 u32 portid, u32 seq, int event, unsigned int flags)
4979 struct net_device *dev = idev->dev;
4980 struct ifinfomsg *hdr;
4981 struct nlmsghdr *nlh;
4984 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
4988 hdr = nlmsg_data(nlh);
4989 hdr->ifi_family = AF_INET6;
4991 hdr->ifi_type = dev->type;
4992 hdr->ifi_index = dev->ifindex;
4993 hdr->ifi_flags = dev_get_flags(dev);
4994 hdr->ifi_change = 0;
4996 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4998 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4999 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
5000 (dev->ifindex != dev_get_iflink(dev) &&
5001 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5002 nla_put_u8(skb, IFLA_OPERSTATE,
5003 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
5004 goto nla_put_failure;
5005 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
5007 goto nla_put_failure;
5009 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
5010 goto nla_put_failure;
5012 nla_nest_end(skb, protoinfo);
5013 nlmsg_end(skb, nlh);
5017 nlmsg_cancel(skb, nlh);
5021 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5023 struct net *net = sock_net(skb->sk);
5026 struct net_device *dev;
5027 struct inet6_dev *idev;
5028 struct hlist_head *head;
5031 s_idx = cb->args[1];
5034 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5036 head = &net->dev_index_head[h];
5037 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5040 idev = __in6_dev_get(dev);
5043 if (inet6_fill_ifinfo(skb, idev,
5044 NETLINK_CB(cb->skb).portid,
5046 RTM_NEWLINK, NLM_F_MULTI) < 0)
5060 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5062 struct sk_buff *skb;
5063 struct net *net = dev_net(idev->dev);
5066 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
5070 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
5072 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5073 WARN_ON(err == -EMSGSIZE);
5077 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
5081 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
5084 static inline size_t inet6_prefix_nlmsg_size(void)
5086 return NLMSG_ALIGN(sizeof(struct prefixmsg))
5087 + nla_total_size(sizeof(struct in6_addr))
5088 + nla_total_size(sizeof(struct prefix_cacheinfo));
5091 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
5092 struct prefix_info *pinfo, u32 portid, u32 seq,
5093 int event, unsigned int flags)
5095 struct prefixmsg *pmsg;
5096 struct nlmsghdr *nlh;
5097 struct prefix_cacheinfo ci;
5099 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
5103 pmsg = nlmsg_data(nlh);
5104 pmsg->prefix_family = AF_INET6;
5105 pmsg->prefix_pad1 = 0;
5106 pmsg->prefix_pad2 = 0;
5107 pmsg->prefix_ifindex = idev->dev->ifindex;
5108 pmsg->prefix_len = pinfo->prefix_len;
5109 pmsg->prefix_type = pinfo->type;
5110 pmsg->prefix_pad3 = 0;
5111 pmsg->prefix_flags = 0;
5113 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5114 if (pinfo->autoconf)
5115 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5117 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5118 goto nla_put_failure;
5119 ci.preferred_time = ntohl(pinfo->prefered);
5120 ci.valid_time = ntohl(pinfo->valid);
5121 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5122 goto nla_put_failure;
5123 nlmsg_end(skb, nlh);
5127 nlmsg_cancel(skb, nlh);
5131 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
5132 struct prefix_info *pinfo)
5134 struct sk_buff *skb;
5135 struct net *net = dev_net(idev->dev);
5138 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
5142 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
5144 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5145 WARN_ON(err == -EMSGSIZE);
5149 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5153 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
5156 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5158 struct net *net = dev_net(ifp->idev->dev);
5163 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5168 * If the address was optimistic
5169 * we inserted the route at the start of
5170 * our DAD process, so we don't need
5173 if (!(ifp->rt->rt6i_node))
5174 ip6_ins_rt(ifp->rt);
5175 if (ifp->idev->cnf.forwarding)
5176 addrconf_join_anycast(ifp);
5177 if (!ipv6_addr_any(&ifp->peer_addr))
5178 addrconf_prefix_route(&ifp->peer_addr, 128,
5179 ifp->idev->dev, 0, 0);
5182 if (ifp->idev->cnf.forwarding)
5183 addrconf_leave_anycast(ifp);
5184 addrconf_leave_solict(ifp->idev, &ifp->addr);
5185 if (!ipv6_addr_any(&ifp->peer_addr)) {
5186 struct rt6_info *rt;
5188 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5189 ifp->idev->dev, 0, 0);
5193 dst_hold(&ifp->rt->dst);
5195 ip6_del_rt(ifp->rt);
5197 rt_genid_bump_ipv6(net);
5200 atomic_inc(&net->ipv6.dev_addr_genid);
5203 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5206 if (likely(ifp->idev->dead == 0))
5207 __ipv6_ifa_notify(event, ifp);
5208 rcu_read_unlock_bh();
5211 #ifdef CONFIG_SYSCTL
5214 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
5215 void __user *buffer, size_t *lenp, loff_t *ppos)
5217 int *valp = ctl->data;
5220 struct ctl_table lctl;
5224 * ctl->data points to idev->cnf.forwarding, we should
5225 * not modify it until we get the rtnl lock.
5230 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5233 ret = addrconf_fixup_forwarding(ctl, valp, val);
5240 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5241 void __user *buffer, size_t *lenp, loff_t *ppos)
5243 struct inet6_dev *idev = ctl->extra1;
5244 int min_mtu = IPV6_MIN_MTU;
5245 struct ctl_table lctl;
5248 lctl.extra1 = &min_mtu;
5249 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5251 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5254 static void dev_disable_change(struct inet6_dev *idev)
5256 struct netdev_notifier_info info;
5258 if (!idev || !idev->dev)
5261 netdev_notifier_info_init(&info, idev->dev);
5262 if (idev->cnf.disable_ipv6)
5263 addrconf_notify(NULL, NETDEV_DOWN, &info);
5265 addrconf_notify(NULL, NETDEV_UP, &info);
5268 static void addrconf_disable_change(struct net *net, __s32 newf)
5270 struct net_device *dev;
5271 struct inet6_dev *idev;
5274 for_each_netdev_rcu(net, dev) {
5275 idev = __in6_dev_get(dev);
5277 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5278 idev->cnf.disable_ipv6 = newf;
5280 dev_disable_change(idev);
5286 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
5291 if (!rtnl_trylock())
5292 return restart_syscall();
5294 net = (struct net *)table->extra2;
5298 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5303 if (p == &net->ipv6.devconf_all->disable_ipv6) {
5304 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5305 addrconf_disable_change(net, newf);
5306 } else if ((!newf) ^ (!old))
5307 dev_disable_change((struct inet6_dev *)table->extra1);
5314 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
5315 void __user *buffer, size_t *lenp, loff_t *ppos)
5317 int *valp = ctl->data;
5320 struct ctl_table lctl;
5324 * ctl->data points to idev->cnf.disable_ipv6, we should
5325 * not modify it until we get the rtnl lock.
5330 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5333 ret = addrconf_disable_ipv6(ctl, valp, val);
5340 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5341 void __user *buffer, size_t *lenp, loff_t *ppos)
5343 int *valp = ctl->data;
5348 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5351 if (write && old != new) {
5352 struct net *net = ctl->extra2;
5354 if (!rtnl_trylock())
5355 return restart_syscall();
5357 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5358 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5359 NETCONFA_IFINDEX_DEFAULT,
5360 net->ipv6.devconf_dflt);
5361 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5362 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5363 NETCONFA_IFINDEX_ALL,
5364 net->ipv6.devconf_all);
5366 struct inet6_dev *idev = ctl->extra1;
5368 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5378 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5379 void __user *buffer, size_t *lenp,
5383 struct in6_addr addr;
5384 char str[IPV6_MAX_STRLEN];
5385 struct ctl_table lctl = *ctl;
5386 struct net *net = ctl->extra2;
5387 struct ipv6_stable_secret *secret = ctl->data;
5389 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5392 lctl.maxlen = IPV6_MAX_STRLEN;
5395 if (!rtnl_trylock())
5396 return restart_syscall();
5398 if (!write && !secret->initialized) {
5403 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
5404 if (err >= sizeof(str)) {
5409 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5413 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5418 secret->initialized = true;
5419 secret->secret = addr;
5421 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5422 struct net_device *dev;
5424 for_each_netdev(net, dev) {
5425 struct inet6_dev *idev = __in6_dev_get(dev);
5428 idev->addr_gen_mode =
5429 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5433 struct inet6_dev *idev = ctl->extra1;
5435 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5445 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
5447 void __user *buffer,
5451 int *valp = ctl->data;
5454 struct ctl_table lctl;
5457 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
5458 * we should not modify it until we get the rtnl lock.
5463 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5466 ret = addrconf_fixup_linkdown(ctl, valp, val);
5472 static struct addrconf_sysctl_table
5474 struct ctl_table_header *sysctl_header;
5475 struct ctl_table addrconf_vars[DEVCONF_MAX+1];
5476 } addrconf_sysctl __read_mostly = {
5477 .sysctl_header = NULL,
5480 .procname = "forwarding",
5481 .data = &ipv6_devconf.forwarding,
5482 .maxlen = sizeof(int),
5484 .proc_handler = addrconf_sysctl_forward,
5487 .procname = "hop_limit",
5488 .data = &ipv6_devconf.hop_limit,
5489 .maxlen = sizeof(int),
5491 .proc_handler = proc_dointvec,
5495 .data = &ipv6_devconf.mtu6,
5496 .maxlen = sizeof(int),
5498 .proc_handler = addrconf_sysctl_mtu,
5501 .procname = "accept_ra",
5502 .data = &ipv6_devconf.accept_ra,
5503 .maxlen = sizeof(int),
5505 .proc_handler = proc_dointvec,
5508 .procname = "accept_redirects",
5509 .data = &ipv6_devconf.accept_redirects,
5510 .maxlen = sizeof(int),
5512 .proc_handler = proc_dointvec,
5515 .procname = "autoconf",
5516 .data = &ipv6_devconf.autoconf,
5517 .maxlen = sizeof(int),
5519 .proc_handler = proc_dointvec,
5522 .procname = "dad_transmits",
5523 .data = &ipv6_devconf.dad_transmits,
5524 .maxlen = sizeof(int),
5526 .proc_handler = proc_dointvec,
5529 .procname = "router_solicitations",
5530 .data = &ipv6_devconf.rtr_solicits,
5531 .maxlen = sizeof(int),
5533 .proc_handler = proc_dointvec,
5536 .procname = "router_solicitation_interval",
5537 .data = &ipv6_devconf.rtr_solicit_interval,
5538 .maxlen = sizeof(int),
5540 .proc_handler = proc_dointvec_jiffies,
5543 .procname = "router_solicitation_delay",
5544 .data = &ipv6_devconf.rtr_solicit_delay,
5545 .maxlen = sizeof(int),
5547 .proc_handler = proc_dointvec_jiffies,
5550 .procname = "force_mld_version",
5551 .data = &ipv6_devconf.force_mld_version,
5552 .maxlen = sizeof(int),
5554 .proc_handler = proc_dointvec,
5557 .procname = "mldv1_unsolicited_report_interval",
5559 &ipv6_devconf.mldv1_unsolicited_report_interval,
5560 .maxlen = sizeof(int),
5562 .proc_handler = proc_dointvec_ms_jiffies,
5565 .procname = "mldv2_unsolicited_report_interval",
5567 &ipv6_devconf.mldv2_unsolicited_report_interval,
5568 .maxlen = sizeof(int),
5570 .proc_handler = proc_dointvec_ms_jiffies,
5573 .procname = "use_tempaddr",
5574 .data = &ipv6_devconf.use_tempaddr,
5575 .maxlen = sizeof(int),
5577 .proc_handler = proc_dointvec,
5580 .procname = "temp_valid_lft",
5581 .data = &ipv6_devconf.temp_valid_lft,
5582 .maxlen = sizeof(int),
5584 .proc_handler = proc_dointvec,
5587 .procname = "temp_prefered_lft",
5588 .data = &ipv6_devconf.temp_prefered_lft,
5589 .maxlen = sizeof(int),
5591 .proc_handler = proc_dointvec,
5594 .procname = "regen_max_retry",
5595 .data = &ipv6_devconf.regen_max_retry,
5596 .maxlen = sizeof(int),
5598 .proc_handler = proc_dointvec,
5601 .procname = "max_desync_factor",
5602 .data = &ipv6_devconf.max_desync_factor,
5603 .maxlen = sizeof(int),
5605 .proc_handler = proc_dointvec,
5608 .procname = "max_addresses",
5609 .data = &ipv6_devconf.max_addresses,
5610 .maxlen = sizeof(int),
5612 .proc_handler = proc_dointvec,
5615 .procname = "accept_ra_defrtr",
5616 .data = &ipv6_devconf.accept_ra_defrtr,
5617 .maxlen = sizeof(int),
5619 .proc_handler = proc_dointvec,
5622 .procname = "accept_ra_min_hop_limit",
5623 .data = &ipv6_devconf.accept_ra_min_hop_limit,
5624 .maxlen = sizeof(int),
5626 .proc_handler = proc_dointvec,
5629 .procname = "accept_ra_pinfo",
5630 .data = &ipv6_devconf.accept_ra_pinfo,
5631 .maxlen = sizeof(int),
5633 .proc_handler = proc_dointvec,
5635 #ifdef CONFIG_IPV6_ROUTER_PREF
5637 .procname = "accept_ra_rtr_pref",
5638 .data = &ipv6_devconf.accept_ra_rtr_pref,
5639 .maxlen = sizeof(int),
5641 .proc_handler = proc_dointvec,
5644 .procname = "router_probe_interval",
5645 .data = &ipv6_devconf.rtr_probe_interval,
5646 .maxlen = sizeof(int),
5648 .proc_handler = proc_dointvec_jiffies,
5650 #ifdef CONFIG_IPV6_ROUTE_INFO
5652 .procname = "accept_ra_rt_info_max_plen",
5653 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
5654 .maxlen = sizeof(int),
5656 .proc_handler = proc_dointvec,
5661 .procname = "accept_ra_rt_table",
5662 .data = &ipv6_devconf.accept_ra_rt_table,
5663 .maxlen = sizeof(int),
5665 .proc_handler = proc_dointvec,
5668 .procname = "proxy_ndp",
5669 .data = &ipv6_devconf.proxy_ndp,
5670 .maxlen = sizeof(int),
5672 .proc_handler = addrconf_sysctl_proxy_ndp,
5675 .procname = "accept_source_route",
5676 .data = &ipv6_devconf.accept_source_route,
5677 .maxlen = sizeof(int),
5679 .proc_handler = proc_dointvec,
5681 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5683 .procname = "optimistic_dad",
5684 .data = &ipv6_devconf.optimistic_dad,
5685 .maxlen = sizeof(int),
5687 .proc_handler = proc_dointvec,
5691 .procname = "use_optimistic",
5692 .data = &ipv6_devconf.use_optimistic,
5693 .maxlen = sizeof(int),
5695 .proc_handler = proc_dointvec,
5699 #ifdef CONFIG_IPV6_MROUTE
5701 .procname = "mc_forwarding",
5702 .data = &ipv6_devconf.mc_forwarding,
5703 .maxlen = sizeof(int),
5705 .proc_handler = proc_dointvec,
5709 .procname = "disable_ipv6",
5710 .data = &ipv6_devconf.disable_ipv6,
5711 .maxlen = sizeof(int),
5713 .proc_handler = addrconf_sysctl_disable,
5716 .procname = "accept_dad",
5717 .data = &ipv6_devconf.accept_dad,
5718 .maxlen = sizeof(int),
5720 .proc_handler = proc_dointvec,
5723 .procname = "force_tllao",
5724 .data = &ipv6_devconf.force_tllao,
5725 .maxlen = sizeof(int),
5727 .proc_handler = proc_dointvec
5730 .procname = "ndisc_notify",
5731 .data = &ipv6_devconf.ndisc_notify,
5732 .maxlen = sizeof(int),
5734 .proc_handler = proc_dointvec
5737 .procname = "suppress_frag_ndisc",
5738 .data = &ipv6_devconf.suppress_frag_ndisc,
5739 .maxlen = sizeof(int),
5741 .proc_handler = proc_dointvec
5744 .procname = "accept_ra_from_local",
5745 .data = &ipv6_devconf.accept_ra_from_local,
5746 .maxlen = sizeof(int),
5748 .proc_handler = proc_dointvec,
5751 .procname = "accept_ra_mtu",
5752 .data = &ipv6_devconf.accept_ra_mtu,
5753 .maxlen = sizeof(int),
5755 .proc_handler = proc_dointvec,
5758 .procname = "stable_secret",
5759 .data = &ipv6_devconf.stable_secret,
5760 .maxlen = IPV6_MAX_STRLEN,
5762 .proc_handler = addrconf_sysctl_stable_secret,
5765 .procname = "use_oif_addrs_only",
5766 .data = &ipv6_devconf.use_oif_addrs_only,
5767 .maxlen = sizeof(int),
5769 .proc_handler = proc_dointvec,
5772 .procname = "ignore_routes_with_linkdown",
5773 .data = &ipv6_devconf.ignore_routes_with_linkdown,
5774 .maxlen = sizeof(int),
5776 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
5784 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
5785 struct inet6_dev *idev, struct ipv6_devconf *p)
5788 struct addrconf_sysctl_table *t;
5789 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
5791 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
5795 for (i = 0; t->addrconf_vars[i].data; i++) {
5796 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
5797 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
5798 t->addrconf_vars[i].extra2 = net;
5801 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
5803 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
5804 if (!t->sysctl_header)
5816 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5818 struct addrconf_sysctl_table *t;
5825 unregister_net_sysctl_table(t->sysctl_header);
5829 static int addrconf_sysctl_register(struct inet6_dev *idev)
5833 if (!sysctl_dev_name_is_allowed(idev->dev->name))
5836 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
5837 &ndisc_ifinfo_sysctl_change);
5840 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
5843 neigh_sysctl_unregister(idev->nd_parms);
5848 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
5850 __addrconf_sysctl_unregister(&idev->cnf);
5851 neigh_sysctl_unregister(idev->nd_parms);
5857 static int __net_init addrconf_init_net(struct net *net)
5860 struct ipv6_devconf *all, *dflt;
5862 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
5866 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
5868 goto err_alloc_dflt;
5870 /* these will be inherited by all namespaces */
5871 dflt->autoconf = ipv6_defaults.autoconf;
5872 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
5874 dflt->stable_secret.initialized = false;
5875 all->stable_secret.initialized = false;
5877 net->ipv6.devconf_all = all;
5878 net->ipv6.devconf_dflt = dflt;
5880 #ifdef CONFIG_SYSCTL
5881 err = __addrconf_sysctl_register(net, "all", NULL, all);
5885 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
5891 #ifdef CONFIG_SYSCTL
5893 __addrconf_sysctl_unregister(all);
5903 static void __net_exit addrconf_exit_net(struct net *net)
5905 #ifdef CONFIG_SYSCTL
5906 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5907 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5909 kfree(net->ipv6.devconf_dflt);
5910 kfree(net->ipv6.devconf_all);
5913 static struct pernet_operations addrconf_ops = {
5914 .init = addrconf_init_net,
5915 .exit = addrconf_exit_net,
5918 static struct rtnl_af_ops inet6_ops __read_mostly = {
5920 .fill_link_af = inet6_fill_link_af,
5921 .get_link_af_size = inet6_get_link_af_size,
5922 .validate_link_af = inet6_validate_link_af,
5923 .set_link_af = inet6_set_link_af,
5927 * Init / cleanup code
5930 int __init addrconf_init(void)
5932 struct inet6_dev *idev;
5935 err = ipv6_addr_label_init();
5937 pr_crit("%s: cannot initialize default policy table: %d\n",
5942 err = register_pernet_subsys(&addrconf_ops);
5946 addrconf_wq = create_workqueue("ipv6_addrconf");
5952 /* The addrconf netdev notifier requires that loopback_dev
5953 * has it's ipv6 private information allocated and setup
5954 * before it can bring up and give link-local addresses
5955 * to other devices which are up.
5957 * Unfortunately, loopback_dev is not necessarily the first
5958 * entry in the global dev_base list of net devices. In fact,
5959 * it is likely to be the very last entry on that list.
5960 * So this causes the notifier registry below to try and
5961 * give link-local addresses to all devices besides loopback_dev
5962 * first, then loopback_dev, which cases all the non-loopback_dev
5963 * devices to fail to get a link-local address.
5965 * So, as a temporary fix, allocate the ipv6 structure for
5966 * loopback_dev first by hand.
5967 * Longer term, all of the dependencies ipv6 has upon the loopback
5968 * device and it being up should be removed.
5971 idev = ipv6_add_dev(init_net.loopback_dev);
5974 err = PTR_ERR(idev);
5978 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5979 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5981 register_netdevice_notifier(&ipv6_dev_notf);
5985 rtnl_af_register(&inet6_ops);
5987 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5992 /* Only the first call to __rtnl_register can fail */
5993 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5994 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5995 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5996 inet6_dump_ifaddr, NULL);
5997 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5998 inet6_dump_ifmcaddr, NULL);
5999 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
6000 inet6_dump_ifacaddr, NULL);
6001 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
6002 inet6_netconf_dump_devconf, NULL);
6004 ipv6_addr_label_rtnl_register();
6008 rtnl_af_unregister(&inet6_ops);
6009 unregister_netdevice_notifier(&ipv6_dev_notf);
6011 destroy_workqueue(addrconf_wq);
6013 unregister_pernet_subsys(&addrconf_ops);
6015 ipv6_addr_label_cleanup();
6020 void addrconf_cleanup(void)
6022 struct net_device *dev;
6025 unregister_netdevice_notifier(&ipv6_dev_notf);
6026 unregister_pernet_subsys(&addrconf_ops);
6027 ipv6_addr_label_cleanup();
6031 __rtnl_af_unregister(&inet6_ops);
6033 /* clean dev list */
6034 for_each_netdev(&init_net, dev) {
6035 if (__in6_dev_get(dev) == NULL)
6037 addrconf_ifdown(dev, 1);
6039 addrconf_ifdown(init_net.loopback_dev, 2);
6044 spin_lock_bh(&addrconf_hash_lock);
6045 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6046 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
6047 spin_unlock_bh(&addrconf_hash_lock);
6048 cancel_delayed_work(&addr_chk_work);
6051 destroy_workqueue(addrconf_wq);