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/sched/signal.h>
47 #include <linux/socket.h>
48 #include <linux/sockios.h>
49 #include <linux/net.h>
50 #include <linux/inet.h>
51 #include <linux/in6.h>
52 #include <linux/netdevice.h>
53 #include <linux/if_addr.h>
54 #include <linux/if_arp.h>
55 #include <linux/if_arcnet.h>
56 #include <linux/if_infiniband.h>
57 #include <linux/route.h>
58 #include <linux/inetdevice.h>
59 #include <linux/init.h>
60 #include <linux/slab.h>
62 #include <linux/sysctl.h>
64 #include <linux/capability.h>
65 #include <linux/delay.h>
66 #include <linux/notifier.h>
67 #include <linux/string.h>
68 #include <linux/hash.h>
70 #include <net/net_namespace.h>
74 #include <net/6lowpan.h>
75 #include <net/firewire.h>
77 #include <net/protocol.h>
78 #include <net/ndisc.h>
79 #include <net/ip6_route.h>
80 #include <net/addrconf.h>
83 #include <net/netlink.h>
84 #include <net/pkt_sched.h>
85 #include <net/l3mdev.h>
86 #include <linux/if_tunnel.h>
87 #include <linux/rtnetlink.h>
88 #include <linux/netconf.h>
89 #include <linux/random.h>
90 #include <linux/uaccess.h>
91 #include <asm/unaligned.h>
93 #include <linux/proc_fs.h>
94 #include <linux/seq_file.h>
95 #include <linux/export.h>
97 #define INFINITY_LIFE_TIME 0xFFFFFFFF
99 #define IPV6_MAX_STRLEN \
100 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
102 static inline u32 cstamp_delta(unsigned long cstamp)
104 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
107 static inline s32 rfc3315_s14_backoff_init(s32 irt)
109 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */
110 u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt;
111 do_div(tmp, 1000000);
115 static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt)
117 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */
118 u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt;
119 do_div(tmp, 1000000);
120 if ((s32)tmp > mrt) {
121 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */
122 tmp = (900000 + prandom_u32() % 200001) * (u64)mrt;
123 do_div(tmp, 1000000);
129 static int addrconf_sysctl_register(struct inet6_dev *idev);
130 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
132 static inline int addrconf_sysctl_register(struct inet6_dev *idev)
137 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
142 static void ipv6_regen_rndid(struct inet6_dev *idev);
143 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
145 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
146 static int ipv6_count_addresses(const struct inet6_dev *idev);
147 static int ipv6_generate_stable_address(struct in6_addr *addr,
149 const struct inet6_dev *idev);
151 #define IN6_ADDR_HSIZE_SHIFT 8
152 #define IN6_ADDR_HSIZE (1 << IN6_ADDR_HSIZE_SHIFT)
154 * Configured unicast address hash table
156 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
157 static DEFINE_SPINLOCK(addrconf_hash_lock);
159 static void addrconf_verify(void);
160 static void addrconf_verify_rtnl(void);
161 static void addrconf_verify_work(struct work_struct *);
163 static struct workqueue_struct *addrconf_wq;
164 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
166 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
167 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
169 static void addrconf_type_change(struct net_device *dev,
170 unsigned long event);
171 static int addrconf_ifdown(struct net_device *dev, int how);
173 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
175 const struct net_device *dev,
176 u32 flags, u32 noflags);
178 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
179 static void addrconf_dad_work(struct work_struct *w);
180 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
182 static void addrconf_dad_run(struct inet6_dev *idev, bool restart);
183 static void addrconf_rs_timer(struct timer_list *t);
184 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
185 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
187 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
188 struct prefix_info *pinfo);
190 static struct ipv6_devconf ipv6_devconf __read_mostly = {
192 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
193 .mtu6 = IPV6_MIN_MTU,
195 .accept_redirects = 1,
197 .force_mld_version = 0,
198 .mldv1_unsolicited_report_interval = 10 * HZ,
199 .mldv2_unsolicited_report_interval = HZ,
201 .rtr_solicits = MAX_RTR_SOLICITATIONS,
202 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
203 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
204 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
206 .temp_valid_lft = TEMP_VALID_LIFETIME,
207 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
208 .regen_max_retry = REGEN_MAX_RETRY,
209 .max_desync_factor = MAX_DESYNC_FACTOR,
210 .max_addresses = IPV6_MAX_ADDRESSES,
211 .accept_ra_defrtr = 1,
212 .accept_ra_from_local = 0,
213 .accept_ra_min_hop_limit= 1,
214 .accept_ra_pinfo = 1,
215 #ifdef CONFIG_IPV6_ROUTER_PREF
216 .accept_ra_rtr_pref = 1,
217 .rtr_probe_interval = 60 * HZ,
218 #ifdef CONFIG_IPV6_ROUTE_INFO
219 .accept_ra_rt_info_min_plen = 0,
220 .accept_ra_rt_info_max_plen = 0,
224 .accept_source_route = 0, /* we do not accept RH0 by default. */
227 .suppress_frag_ndisc = 1,
230 .initialized = false,
232 .use_oif_addrs_only = 0,
233 .ignore_routes_with_linkdown = 0,
234 .keep_addr_on_down = 0,
236 #ifdef CONFIG_IPV6_SEG6_HMAC
237 .seg6_require_hmac = 0,
240 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
244 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
246 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
247 .mtu6 = IPV6_MIN_MTU,
249 .accept_redirects = 1,
251 .force_mld_version = 0,
252 .mldv1_unsolicited_report_interval = 10 * HZ,
253 .mldv2_unsolicited_report_interval = HZ,
255 .rtr_solicits = MAX_RTR_SOLICITATIONS,
256 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
257 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
258 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
260 .temp_valid_lft = TEMP_VALID_LIFETIME,
261 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
262 .regen_max_retry = REGEN_MAX_RETRY,
263 .max_desync_factor = MAX_DESYNC_FACTOR,
264 .max_addresses = IPV6_MAX_ADDRESSES,
265 .accept_ra_defrtr = 1,
266 .accept_ra_from_local = 0,
267 .accept_ra_min_hop_limit= 1,
268 .accept_ra_pinfo = 1,
269 #ifdef CONFIG_IPV6_ROUTER_PREF
270 .accept_ra_rtr_pref = 1,
271 .rtr_probe_interval = 60 * HZ,
272 #ifdef CONFIG_IPV6_ROUTE_INFO
273 .accept_ra_rt_info_min_plen = 0,
274 .accept_ra_rt_info_max_plen = 0,
278 .accept_source_route = 0, /* we do not accept RH0 by default. */
281 .suppress_frag_ndisc = 1,
284 .initialized = false,
286 .use_oif_addrs_only = 0,
287 .ignore_routes_with_linkdown = 0,
288 .keep_addr_on_down = 0,
290 #ifdef CONFIG_IPV6_SEG6_HMAC
291 .seg6_require_hmac = 0,
294 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
298 /* Check if link is ready: is it up and is a valid qdisc available */
299 static inline bool addrconf_link_ready(const struct net_device *dev)
301 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev);
304 static void addrconf_del_rs_timer(struct inet6_dev *idev)
306 if (del_timer(&idev->rs_timer))
310 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
312 if (cancel_delayed_work(&ifp->dad_work))
316 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
319 if (!timer_pending(&idev->rs_timer))
321 mod_timer(&idev->rs_timer, jiffies + when);
324 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
328 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay))
332 static int snmp6_alloc_dev(struct inet6_dev *idev)
336 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
337 if (!idev->stats.ipv6)
340 for_each_possible_cpu(i) {
341 struct ipstats_mib *addrconf_stats;
342 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
343 u64_stats_init(&addrconf_stats->syncp);
347 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
349 if (!idev->stats.icmpv6dev)
351 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
353 if (!idev->stats.icmpv6msgdev)
359 kfree(idev->stats.icmpv6dev);
361 free_percpu(idev->stats.ipv6);
366 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
368 struct inet6_dev *ndev;
373 if (dev->mtu < IPV6_MIN_MTU)
374 return ERR_PTR(-EINVAL);
376 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
380 rwlock_init(&ndev->lock);
382 INIT_LIST_HEAD(&ndev->addr_list);
383 timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0);
384 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
386 if (ndev->cnf.stable_secret.initialized)
387 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
389 ndev->cnf.mtu6 = dev->mtu;
390 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
391 if (!ndev->nd_parms) {
395 if (ndev->cnf.forwarding)
396 dev_disable_lro(dev);
397 /* We refer to the device */
400 if (snmp6_alloc_dev(ndev) < 0) {
401 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n",
403 neigh_parms_release(&nd_tbl, ndev->nd_parms);
409 if (snmp6_register_dev(ndev) < 0) {
410 netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n",
411 __func__, dev->name);
415 /* One reference from device. */
416 refcount_set(&ndev->refcnt, 1);
418 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
419 ndev->cnf.accept_dad = -1;
421 #if IS_ENABLED(CONFIG_IPV6_SIT)
422 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
423 pr_info("%s: Disabled Multicast RS\n", dev->name);
424 ndev->cnf.rtr_solicits = 0;
428 INIT_LIST_HEAD(&ndev->tempaddr_list);
429 ndev->desync_factor = U32_MAX;
430 if ((dev->flags&IFF_LOOPBACK) ||
431 dev->type == ARPHRD_TUNNEL ||
432 dev->type == ARPHRD_TUNNEL6 ||
433 dev->type == ARPHRD_SIT ||
434 dev->type == ARPHRD_NONE) {
435 ndev->cnf.use_tempaddr = -1;
437 ipv6_regen_rndid(ndev);
439 ndev->token = in6addr_any;
441 if (netif_running(dev) && addrconf_link_ready(dev))
442 ndev->if_flags |= IF_READY;
444 ipv6_mc_init_dev(ndev);
445 ndev->tstamp = jiffies;
446 err = addrconf_sysctl_register(ndev);
448 ipv6_mc_destroy_dev(ndev);
449 snmp6_unregister_dev(ndev);
452 /* protected by rtnl_lock */
453 rcu_assign_pointer(dev->ip6_ptr, ndev);
455 /* Join interface-local all-node multicast group */
456 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
458 /* Join all-node multicast group */
459 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
461 /* Join all-router multicast group if forwarding is set */
462 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
463 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
468 neigh_parms_release(&nd_tbl, ndev->nd_parms);
470 in6_dev_finish_destroy(ndev);
474 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
476 struct inet6_dev *idev;
480 idev = __in6_dev_get(dev);
482 idev = ipv6_add_dev(dev);
487 if (dev->flags&IFF_UP)
492 static int inet6_netconf_msgsize_devconf(int type)
494 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
495 + nla_total_size(4); /* NETCONFA_IFINDEX */
498 if (type == NETCONFA_ALL)
501 if (all || type == NETCONFA_FORWARDING)
502 size += nla_total_size(4);
503 #ifdef CONFIG_IPV6_MROUTE
504 if (all || type == NETCONFA_MC_FORWARDING)
505 size += nla_total_size(4);
507 if (all || type == NETCONFA_PROXY_NEIGH)
508 size += nla_total_size(4);
510 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
511 size += nla_total_size(4);
516 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
517 struct ipv6_devconf *devconf, u32 portid,
518 u32 seq, int event, unsigned int flags,
521 struct nlmsghdr *nlh;
522 struct netconfmsg *ncm;
525 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
530 if (type == NETCONFA_ALL)
533 ncm = nlmsg_data(nlh);
534 ncm->ncm_family = AF_INET6;
536 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
537 goto nla_put_failure;
542 if ((all || type == NETCONFA_FORWARDING) &&
543 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
544 goto nla_put_failure;
545 #ifdef CONFIG_IPV6_MROUTE
546 if ((all || type == NETCONFA_MC_FORWARDING) &&
547 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
548 devconf->mc_forwarding) < 0)
549 goto nla_put_failure;
551 if ((all || type == NETCONFA_PROXY_NEIGH) &&
552 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
553 goto nla_put_failure;
555 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
556 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
557 devconf->ignore_routes_with_linkdown) < 0)
558 goto nla_put_failure;
565 nlmsg_cancel(skb, nlh);
569 void inet6_netconf_notify_devconf(struct net *net, int event, int type,
570 int ifindex, struct ipv6_devconf *devconf)
575 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL);
579 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
582 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
583 WARN_ON(err == -EMSGSIZE);
587 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL);
590 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
593 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
594 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
595 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
596 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
597 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
600 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
601 struct nlmsghdr *nlh,
602 struct netlink_ext_ack *extack)
604 struct net *net = sock_net(in_skb->sk);
605 struct nlattr *tb[NETCONFA_MAX+1];
606 struct inet6_dev *in6_dev = NULL;
607 struct net_device *dev = NULL;
608 struct netconfmsg *ncm;
610 struct ipv6_devconf *devconf;
614 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
615 devconf_ipv6_policy, extack);
619 if (!tb[NETCONFA_IFINDEX])
623 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
625 case NETCONFA_IFINDEX_ALL:
626 devconf = net->ipv6.devconf_all;
628 case NETCONFA_IFINDEX_DEFAULT:
629 devconf = net->ipv6.devconf_dflt;
632 dev = dev_get_by_index(net, ifindex);
635 in6_dev = in6_dev_get(dev);
638 devconf = &in6_dev->cnf;
643 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL);
647 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
648 NETLINK_CB(in_skb).portid,
649 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
652 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
653 WARN_ON(err == -EMSGSIZE);
657 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
660 in6_dev_put(in6_dev);
666 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
667 struct netlink_callback *cb)
669 struct net *net = sock_net(skb->sk);
672 struct net_device *dev;
673 struct inet6_dev *idev;
674 struct hlist_head *head;
677 s_idx = idx = cb->args[1];
679 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
681 head = &net->dev_index_head[h];
683 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
685 hlist_for_each_entry_rcu(dev, head, index_hlist) {
688 idev = __in6_dev_get(dev);
692 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
694 NETLINK_CB(cb->skb).portid,
702 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
708 if (h == NETDEV_HASHENTRIES) {
709 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
710 net->ipv6.devconf_all,
711 NETLINK_CB(cb->skb).portid,
713 RTM_NEWNETCONF, NLM_F_MULTI,
719 if (h == NETDEV_HASHENTRIES + 1) {
720 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
721 net->ipv6.devconf_dflt,
722 NETLINK_CB(cb->skb).portid,
724 RTM_NEWNETCONF, NLM_F_MULTI,
738 static void dev_forward_change(struct inet6_dev *idev)
740 struct net_device *dev;
741 struct inet6_ifaddr *ifa;
746 if (idev->cnf.forwarding)
747 dev_disable_lro(dev);
748 if (dev->flags & IFF_MULTICAST) {
749 if (idev->cnf.forwarding) {
750 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
751 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
752 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
754 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
755 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
756 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
760 list_for_each_entry(ifa, &idev->addr_list, if_list) {
761 if (ifa->flags&IFA_F_TENTATIVE)
763 if (idev->cnf.forwarding)
764 addrconf_join_anycast(ifa);
766 addrconf_leave_anycast(ifa);
768 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
770 dev->ifindex, &idev->cnf);
774 static void addrconf_forward_change(struct net *net, __s32 newf)
776 struct net_device *dev;
777 struct inet6_dev *idev;
779 for_each_netdev(net, dev) {
780 idev = __in6_dev_get(dev);
782 int changed = (!idev->cnf.forwarding) ^ (!newf);
783 idev->cnf.forwarding = newf;
785 dev_forward_change(idev);
790 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
796 return restart_syscall();
798 net = (struct net *)table->extra2;
802 if (p == &net->ipv6.devconf_dflt->forwarding) {
803 if ((!newf) ^ (!old))
804 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
806 NETCONFA_IFINDEX_DEFAULT,
807 net->ipv6.devconf_dflt);
812 if (p == &net->ipv6.devconf_all->forwarding) {
813 int old_dflt = net->ipv6.devconf_dflt->forwarding;
815 net->ipv6.devconf_dflt->forwarding = newf;
816 if ((!newf) ^ (!old_dflt))
817 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
819 NETCONFA_IFINDEX_DEFAULT,
820 net->ipv6.devconf_dflt);
822 addrconf_forward_change(net, newf);
823 if ((!newf) ^ (!old))
824 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
826 NETCONFA_IFINDEX_ALL,
827 net->ipv6.devconf_all);
828 } else if ((!newf) ^ (!old))
829 dev_forward_change((struct inet6_dev *)table->extra1);
833 rt6_purge_dflt_routers(net);
837 static void addrconf_linkdown_change(struct net *net, __s32 newf)
839 struct net_device *dev;
840 struct inet6_dev *idev;
842 for_each_netdev(net, dev) {
843 idev = __in6_dev_get(dev);
845 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
847 idev->cnf.ignore_routes_with_linkdown = newf;
849 inet6_netconf_notify_devconf(dev_net(dev),
851 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
858 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
864 return restart_syscall();
866 net = (struct net *)table->extra2;
870 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
871 if ((!newf) ^ (!old))
872 inet6_netconf_notify_devconf(net,
874 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
875 NETCONFA_IFINDEX_DEFAULT,
876 net->ipv6.devconf_dflt);
881 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
882 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
883 addrconf_linkdown_change(net, newf);
884 if ((!newf) ^ (!old))
885 inet6_netconf_notify_devconf(net,
887 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
888 NETCONFA_IFINDEX_ALL,
889 net->ipv6.devconf_all);
898 /* Nobody refers to this ifaddr, destroy it */
899 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
901 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
903 #ifdef NET_REFCNT_DEBUG
904 pr_debug("%s\n", __func__);
907 in6_dev_put(ifp->idev);
909 if (cancel_delayed_work(&ifp->dad_work))
910 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
913 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
914 pr_warn("Freeing alive inet6 address %p\n", ifp);
922 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
925 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
928 * Each device address list is sorted in order of scope -
929 * global before linklocal.
931 list_for_each(p, &idev->addr_list) {
932 struct inet6_ifaddr *ifa
933 = list_entry(p, struct inet6_ifaddr, if_list);
934 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
938 list_add_tail_rcu(&ifp->if_list, p);
941 static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr)
943 u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net);
945 return hash_32(val, IN6_ADDR_HSIZE_SHIFT);
948 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
949 struct net_device *dev, unsigned int hash)
951 struct inet6_ifaddr *ifp;
953 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
954 if (!net_eq(dev_net(ifp->idev->dev), net))
956 if (ipv6_addr_equal(&ifp->addr, addr)) {
957 if (!dev || ifp->idev->dev == dev)
964 static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa)
966 unsigned int hash = inet6_addr_hash(dev_net(dev), &ifa->addr);
969 spin_lock(&addrconf_hash_lock);
971 /* Ignore adding duplicate addresses on an interface */
972 if (ipv6_chk_same_addr(dev_net(dev), &ifa->addr, dev, hash)) {
973 netdev_dbg(dev, "ipv6_add_addr: already assigned\n");
976 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
979 spin_unlock(&addrconf_hash_lock);
984 /* On success it returns ifp with increased reference count */
986 static struct inet6_ifaddr *
987 ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg,
988 bool can_block, struct netlink_ext_ack *extack)
990 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC;
991 int addr_type = ipv6_addr_type(cfg->pfx);
992 struct net *net = dev_net(idev->dev);
993 struct inet6_ifaddr *ifa = NULL;
994 struct fib6_info *f6i = NULL;
997 if (addr_type == IPV6_ADDR_ANY ||
998 (addr_type & IPV6_ADDR_MULTICAST &&
999 !(cfg->ifa_flags & IFA_F_MCAUTOJOIN)) ||
1000 (!(idev->dev->flags & IFF_LOOPBACK) &&
1001 addr_type & IPV6_ADDR_LOOPBACK))
1002 return ERR_PTR(-EADDRNOTAVAIL);
1005 err = -ENODEV; /*XXX*/
1009 if (idev->cnf.disable_ipv6) {
1014 /* validator notifier needs to be blocking;
1015 * do not call in atomic context
1018 struct in6_validator_info i6vi = {
1019 .i6vi_addr = *cfg->pfx,
1024 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi);
1025 err = notifier_to_errno(err);
1030 ifa = kzalloc(sizeof(*ifa), gfp_flags);
1036 f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags);
1043 if (net->ipv6.devconf_all->disable_policy ||
1044 idev->cnf.disable_policy)
1045 f6i->dst_nopolicy = true;
1047 neigh_parms_data_state_setall(idev->nd_parms);
1049 ifa->addr = *cfg->pfx;
1051 ifa->peer_addr = *cfg->peer_pfx;
1053 spin_lock_init(&ifa->lock);
1054 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
1055 INIT_HLIST_NODE(&ifa->addr_lst);
1056 ifa->scope = cfg->scope;
1057 ifa->prefix_len = cfg->plen;
1058 ifa->rt_priority = cfg->rt_priority;
1059 ifa->flags = cfg->ifa_flags;
1060 /* No need to add the TENTATIVE flag for addresses with NODAD */
1061 if (!(cfg->ifa_flags & IFA_F_NODAD))
1062 ifa->flags |= IFA_F_TENTATIVE;
1063 ifa->valid_lft = cfg->valid_lft;
1064 ifa->prefered_lft = cfg->preferred_lft;
1065 ifa->cstamp = ifa->tstamp = jiffies;
1066 ifa->tokenized = false;
1074 refcount_set(&ifa->refcnt, 1);
1078 err = ipv6_add_addr_hash(idev->dev, ifa);
1080 rcu_read_unlock_bh();
1084 write_lock(&idev->lock);
1086 /* Add to inet6_dev unicast addr list. */
1087 ipv6_link_dev_addr(idev, ifa);
1089 if (ifa->flags&IFA_F_TEMPORARY) {
1090 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1095 write_unlock(&idev->lock);
1097 rcu_read_unlock_bh();
1099 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1101 if (unlikely(err < 0)) {
1102 fib6_info_release(f6i);
1106 in6_dev_put(ifa->idev);
1115 enum cleanup_prefix_rt_t {
1116 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1117 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1118 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1122 * Check, whether the prefix for ifp would still need a prefix route
1123 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1126 * 1) we don't purge prefix if address was not permanent.
1127 * prefix is managed by its own lifetime.
1128 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1129 * 3) if there are no addresses, delete prefix.
1130 * 4) if there are still other permanent address(es),
1131 * corresponding prefix is still permanent.
1132 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1133 * don't purge the prefix, assume user space is managing it.
1134 * 6) otherwise, update prefix lifetime to the
1135 * longest valid lifetime among the corresponding
1136 * addresses on the device.
1137 * Note: subsequent RA will update lifetime.
1139 static enum cleanup_prefix_rt_t
1140 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1142 struct inet6_ifaddr *ifa;
1143 struct inet6_dev *idev = ifp->idev;
1144 unsigned long lifetime;
1145 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1149 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1152 if (ifa->prefix_len != ifp->prefix_len ||
1153 !ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1156 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1157 return CLEANUP_PREFIX_RT_NOP;
1159 action = CLEANUP_PREFIX_RT_EXPIRE;
1161 spin_lock(&ifa->lock);
1163 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1165 * Note: Because this address is
1166 * not permanent, lifetime <
1167 * LONG_MAX / HZ here.
1169 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1170 *expires = ifa->tstamp + lifetime * HZ;
1171 spin_unlock(&ifa->lock);
1178 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires,
1179 bool del_rt, bool del_peer)
1181 struct fib6_info *f6i;
1183 f6i = addrconf_get_prefix_route(del_peer ? &ifp->peer_addr : &ifp->addr,
1186 0, RTF_GATEWAY | RTF_DEFAULT);
1189 ip6_del_rt(dev_net(ifp->idev->dev), f6i);
1191 if (!(f6i->fib6_flags & RTF_EXPIRES))
1192 fib6_set_expires(f6i, expires);
1193 fib6_info_release(f6i);
1199 /* This function wants to get referenced ifp and releases it before return */
1201 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1204 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1205 unsigned long expires;
1209 spin_lock_bh(&ifp->lock);
1211 ifp->state = INET6_IFADDR_STATE_DEAD;
1212 spin_unlock_bh(&ifp->lock);
1214 if (state == INET6_IFADDR_STATE_DEAD)
1217 spin_lock_bh(&addrconf_hash_lock);
1218 hlist_del_init_rcu(&ifp->addr_lst);
1219 spin_unlock_bh(&addrconf_hash_lock);
1221 write_lock_bh(&ifp->idev->lock);
1223 if (ifp->flags&IFA_F_TEMPORARY) {
1224 list_del(&ifp->tmp_list);
1226 in6_ifa_put(ifp->ifpub);
1232 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1233 action = check_cleanup_prefix_route(ifp, &expires);
1235 list_del_rcu(&ifp->if_list);
1238 write_unlock_bh(&ifp->idev->lock);
1240 addrconf_del_dad_work(ifp);
1242 ipv6_ifa_notify(RTM_DELADDR, ifp);
1244 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1246 if (action != CLEANUP_PREFIX_RT_NOP) {
1247 cleanup_prefix_route(ifp, expires,
1248 action == CLEANUP_PREFIX_RT_DEL, false);
1251 /* clean up prefsrc entries */
1252 rt6_remove_prefsrc(ifp);
1257 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp,
1258 struct inet6_ifaddr *ift,
1261 struct inet6_dev *idev = ifp->idev;
1262 struct in6_addr addr, *tmpaddr;
1263 unsigned long tmp_tstamp, age;
1264 unsigned long regen_advance;
1265 struct ifa6_config cfg;
1267 unsigned long now = jiffies;
1268 long max_desync_factor;
1269 s32 cnf_temp_preferred_lft;
1271 write_lock_bh(&idev->lock);
1273 spin_lock_bh(&ift->lock);
1274 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1275 spin_unlock_bh(&ift->lock);
1282 if (idev->cnf.use_tempaddr <= 0) {
1283 write_unlock_bh(&idev->lock);
1284 pr_info("%s: use_tempaddr is disabled\n", __func__);
1289 spin_lock_bh(&ifp->lock);
1290 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1291 idev->cnf.use_tempaddr = -1; /*XXX*/
1292 spin_unlock_bh(&ifp->lock);
1293 write_unlock_bh(&idev->lock);
1294 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1301 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1302 ipv6_try_regen_rndid(idev, tmpaddr);
1303 memcpy(&addr.s6_addr[8], idev->rndid, 8);
1304 age = (now - ifp->tstamp) / HZ;
1306 regen_advance = idev->cnf.regen_max_retry *
1307 idev->cnf.dad_transmits *
1308 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1310 /* recalculate max_desync_factor each time and update
1311 * idev->desync_factor if it's larger
1313 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
1314 max_desync_factor = min_t(__u32,
1315 idev->cnf.max_desync_factor,
1316 cnf_temp_preferred_lft - regen_advance);
1318 if (unlikely(idev->desync_factor > max_desync_factor)) {
1319 if (max_desync_factor > 0) {
1320 get_random_bytes(&idev->desync_factor,
1321 sizeof(idev->desync_factor));
1322 idev->desync_factor %= max_desync_factor;
1324 idev->desync_factor = 0;
1328 memset(&cfg, 0, sizeof(cfg));
1329 cfg.valid_lft = min_t(__u32, ifp->valid_lft,
1330 idev->cnf.temp_valid_lft + age);
1331 cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor;
1332 cfg.preferred_lft = min_t(__u32, ifp->prefered_lft, cfg.preferred_lft);
1334 cfg.plen = ifp->prefix_len;
1335 tmp_tstamp = ifp->tstamp;
1336 spin_unlock_bh(&ifp->lock);
1338 write_unlock_bh(&idev->lock);
1340 /* A temporary address is created only if this calculated Preferred
1341 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1342 * an implementation must not create a temporary address with a zero
1343 * Preferred Lifetime.
1344 * Use age calculation as in addrconf_verify to avoid unnecessary
1345 * temporary addresses being generated.
1347 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1348 if (cfg.preferred_lft <= regen_advance + age) {
1355 cfg.ifa_flags = IFA_F_TEMPORARY;
1356 /* set in addrconf_prefix_rcv() */
1357 if (ifp->flags & IFA_F_OPTIMISTIC)
1358 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
1361 cfg.scope = ipv6_addr_scope(cfg.pfx);
1363 ift = ipv6_add_addr(idev, &cfg, block, NULL);
1367 pr_info("%s: retry temporary address regeneration\n", __func__);
1369 write_lock_bh(&idev->lock);
1373 spin_lock_bh(&ift->lock);
1376 ift->tstamp = tmp_tstamp;
1377 spin_unlock_bh(&ift->lock);
1379 addrconf_dad_start(ift);
1387 * Choose an appropriate source address (RFC3484)
1390 IPV6_SADDR_RULE_INIT = 0,
1391 IPV6_SADDR_RULE_LOCAL,
1392 IPV6_SADDR_RULE_SCOPE,
1393 IPV6_SADDR_RULE_PREFERRED,
1394 #ifdef CONFIG_IPV6_MIP6
1395 IPV6_SADDR_RULE_HOA,
1397 IPV6_SADDR_RULE_OIF,
1398 IPV6_SADDR_RULE_LABEL,
1399 IPV6_SADDR_RULE_PRIVACY,
1400 IPV6_SADDR_RULE_ORCHID,
1401 IPV6_SADDR_RULE_PREFIX,
1402 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1403 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1408 struct ipv6_saddr_score {
1411 struct inet6_ifaddr *ifa;
1412 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1417 struct ipv6_saddr_dst {
1418 const struct in6_addr *addr;
1425 static inline int ipv6_saddr_preferred(int type)
1427 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1432 static bool ipv6_use_optimistic_addr(struct net *net,
1433 struct inet6_dev *idev)
1435 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1438 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1440 if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic)
1449 static bool ipv6_allow_optimistic_dad(struct net *net,
1450 struct inet6_dev *idev)
1452 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1455 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1464 static int ipv6_get_saddr_eval(struct net *net,
1465 struct ipv6_saddr_score *score,
1466 struct ipv6_saddr_dst *dst,
1471 if (i <= score->rule) {
1473 case IPV6_SADDR_RULE_SCOPE:
1474 ret = score->scopedist;
1476 case IPV6_SADDR_RULE_PREFIX:
1477 ret = score->matchlen;
1480 ret = !!test_bit(i, score->scorebits);
1486 case IPV6_SADDR_RULE_INIT:
1487 /* Rule 0: remember if hiscore is not ready yet */
1490 case IPV6_SADDR_RULE_LOCAL:
1491 /* Rule 1: Prefer same address */
1492 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1494 case IPV6_SADDR_RULE_SCOPE:
1495 /* Rule 2: Prefer appropriate scope
1500 * ---+--+-+---> scope
1502 * | d is scope of the destination.
1504 * | \ <- smaller scope is better if
1505 * B-15 | \ if scope is enough for destination.
1506 * | ret = B - scope (-1 <= scope >= d <= 15).
1508 * |/ <- greater is better
1509 * -C / if scope is not enough for destination.
1510 * /| ret = scope - C (-1 <= d < scope <= 15).
1512 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1513 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1514 * Assume B = 0 and we get C > 29.
1516 ret = __ipv6_addr_src_scope(score->addr_type);
1517 if (ret >= dst->scope)
1520 ret -= 128; /* 30 is enough */
1521 score->scopedist = ret;
1523 case IPV6_SADDR_RULE_PREFERRED:
1525 /* Rule 3: Avoid deprecated and optimistic addresses */
1526 u8 avoid = IFA_F_DEPRECATED;
1528 if (!ipv6_use_optimistic_addr(net, score->ifa->idev))
1529 avoid |= IFA_F_OPTIMISTIC;
1530 ret = ipv6_saddr_preferred(score->addr_type) ||
1531 !(score->ifa->flags & avoid);
1534 #ifdef CONFIG_IPV6_MIP6
1535 case IPV6_SADDR_RULE_HOA:
1537 /* Rule 4: Prefer home address */
1538 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1539 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1543 case IPV6_SADDR_RULE_OIF:
1544 /* Rule 5: Prefer outgoing interface */
1545 ret = (!dst->ifindex ||
1546 dst->ifindex == score->ifa->idev->dev->ifindex);
1548 case IPV6_SADDR_RULE_LABEL:
1549 /* Rule 6: Prefer matching label */
1550 ret = ipv6_addr_label(net,
1551 &score->ifa->addr, score->addr_type,
1552 score->ifa->idev->dev->ifindex) == dst->label;
1554 case IPV6_SADDR_RULE_PRIVACY:
1556 /* Rule 7: Prefer public address
1557 * Note: prefer temporary address if use_tempaddr >= 2
1559 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1560 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1561 score->ifa->idev->cnf.use_tempaddr >= 2;
1562 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1565 case IPV6_SADDR_RULE_ORCHID:
1566 /* Rule 8-: Prefer ORCHID vs ORCHID or
1567 * non-ORCHID vs non-ORCHID
1569 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1570 ipv6_addr_orchid(dst->addr));
1572 case IPV6_SADDR_RULE_PREFIX:
1573 /* Rule 8: Use longest matching prefix */
1574 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1575 if (ret > score->ifa->prefix_len)
1576 ret = score->ifa->prefix_len;
1577 score->matchlen = ret;
1579 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1580 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1581 /* Optimistic addresses still have lower precedence than other
1582 * preferred addresses.
1584 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1592 __set_bit(i, score->scorebits);
1598 static int __ipv6_dev_get_saddr(struct net *net,
1599 struct ipv6_saddr_dst *dst,
1600 struct inet6_dev *idev,
1601 struct ipv6_saddr_score *scores,
1604 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1606 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) {
1610 * - Tentative Address (RFC2462 section 5.4)
1611 * - A tentative address is not considered
1612 * "assigned to an interface" in the traditional
1613 * sense, unless it is also flagged as optimistic.
1614 * - Candidate Source Address (section 4)
1615 * - In any case, anycast addresses, multicast
1616 * addresses, and the unspecified address MUST
1617 * NOT be included in a candidate set.
1619 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1620 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1623 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1625 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1626 score->addr_type & IPV6_ADDR_MULTICAST)) {
1627 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1633 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1635 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1636 int minihiscore, miniscore;
1638 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1639 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1641 if (minihiscore > miniscore) {
1642 if (i == IPV6_SADDR_RULE_SCOPE &&
1643 score->scopedist > 0) {
1646 * each remaining entry
1647 * has too small (not enough)
1648 * scope, because ifa entries
1649 * are sorted by their scope
1655 } else if (minihiscore < miniscore) {
1656 swap(hiscore, score);
1657 hiscore_idx = 1 - hiscore_idx;
1659 /* restore our iterator */
1660 score->ifa = hiscore->ifa;
1670 static int ipv6_get_saddr_master(struct net *net,
1671 const struct net_device *dst_dev,
1672 const struct net_device *master,
1673 struct ipv6_saddr_dst *dst,
1674 struct ipv6_saddr_score *scores,
1677 struct inet6_dev *idev;
1679 idev = __in6_dev_get(dst_dev);
1681 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1682 scores, hiscore_idx);
1684 idev = __in6_dev_get(master);
1686 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1687 scores, hiscore_idx);
1692 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1693 const struct in6_addr *daddr, unsigned int prefs,
1694 struct in6_addr *saddr)
1696 struct ipv6_saddr_score scores[2], *hiscore;
1697 struct ipv6_saddr_dst dst;
1698 struct inet6_dev *idev;
1699 struct net_device *dev;
1701 bool use_oif_addr = false;
1702 int hiscore_idx = 0;
1705 dst_type = __ipv6_addr_type(daddr);
1707 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1708 dst.scope = __ipv6_addr_src_scope(dst_type);
1709 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1712 scores[hiscore_idx].rule = -1;
1713 scores[hiscore_idx].ifa = NULL;
1717 /* Candidate Source Address (section 4)
1718 * - multicast and link-local destination address,
1719 * the set of candidate source address MUST only
1720 * include addresses assigned to interfaces
1721 * belonging to the same link as the outgoing
1723 * (- For site-local destination addresses, the
1724 * set of candidate source addresses MUST only
1725 * include addresses assigned to interfaces
1726 * belonging to the same site as the outgoing
1728 * - "It is RECOMMENDED that the candidate source addresses
1729 * be the set of unicast addresses assigned to the
1730 * interface that will be used to send to the destination
1731 * (the 'outgoing' interface)." (RFC 6724)
1734 idev = __in6_dev_get(dst_dev);
1735 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1736 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1737 (idev && idev->cnf.use_oif_addrs_only)) {
1738 use_oif_addr = true;
1744 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1746 const struct net_device *master;
1749 /* if dst_dev exists and is enslaved to an L3 device, then
1750 * prefer addresses from dst_dev and then the master over
1751 * any other enslaved devices in the L3 domain.
1753 master = l3mdev_master_dev_rcu(dst_dev);
1755 master_idx = master->ifindex;
1757 hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1759 scores, hiscore_idx);
1761 if (scores[hiscore_idx].ifa)
1765 for_each_netdev_rcu(net, dev) {
1766 /* only consider addresses on devices in the
1769 if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1771 idev = __in6_dev_get(dev);
1774 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1779 hiscore = &scores[hiscore_idx];
1781 ret = -EADDRNOTAVAIL;
1783 *saddr = hiscore->ifa->addr;
1788 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1790 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1793 struct inet6_ifaddr *ifp;
1794 int err = -EADDRNOTAVAIL;
1796 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1797 if (ifp->scope > IFA_LINK)
1799 if (ifp->scope == IFA_LINK &&
1800 !(ifp->flags & banned_flags)) {
1809 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1812 struct inet6_dev *idev;
1813 int err = -EADDRNOTAVAIL;
1816 idev = __in6_dev_get(dev);
1818 read_lock_bh(&idev->lock);
1819 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1820 read_unlock_bh(&idev->lock);
1826 static int ipv6_count_addresses(const struct inet6_dev *idev)
1828 const struct inet6_ifaddr *ifp;
1832 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list)
1838 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1839 const struct net_device *dev, int strict)
1841 return ipv6_chk_addr_and_flags(net, addr, dev, !dev,
1842 strict, IFA_F_TENTATIVE);
1844 EXPORT_SYMBOL(ipv6_chk_addr);
1846 /* device argument is used to find the L3 domain of interest. If
1847 * skip_dev_check is set, then the ifp device is not checked against
1848 * the passed in dev argument. So the 2 cases for addresses checks are:
1849 * 1. does the address exist in the L3 domain that dev is part of
1850 * (skip_dev_check = true), or
1852 * 2. does the address exist on the specific device
1853 * (skip_dev_check = false)
1855 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1856 const struct net_device *dev, bool skip_dev_check,
1857 int strict, u32 banned_flags)
1859 unsigned int hash = inet6_addr_hash(net, addr);
1860 const struct net_device *l3mdev;
1861 struct inet6_ifaddr *ifp;
1866 l3mdev = l3mdev_master_dev_rcu(dev);
1870 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1871 if (!net_eq(dev_net(ifp->idev->dev), net))
1874 if (l3mdev_master_dev_rcu(ifp->idev->dev) != l3mdev)
1877 /* Decouple optimistic from tentative for evaluation here.
1878 * Ban optimistic addresses explicitly, when required.
1880 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1881 ? (ifp->flags&~IFA_F_TENTATIVE)
1883 if (ipv6_addr_equal(&ifp->addr, addr) &&
1884 !(ifp_flags&banned_flags) &&
1885 (!dev || ifp->idev->dev == dev ||
1886 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1895 EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1898 /* Compares an address/prefix_len with addresses on device @dev.
1899 * If one is found it returns true.
1901 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1902 const unsigned int prefix_len, struct net_device *dev)
1904 const struct inet6_ifaddr *ifa;
1905 const struct inet6_dev *idev;
1909 idev = __in6_dev_get(dev);
1911 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
1912 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1921 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1923 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1925 const struct inet6_ifaddr *ifa;
1926 const struct inet6_dev *idev;
1931 idev = __in6_dev_get(dev);
1933 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
1934 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1943 EXPORT_SYMBOL(ipv6_chk_prefix);
1945 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1946 struct net_device *dev, int strict)
1948 unsigned int hash = inet6_addr_hash(net, addr);
1949 struct inet6_ifaddr *ifp, *result = NULL;
1952 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1953 if (!net_eq(dev_net(ifp->idev->dev), net))
1955 if (ipv6_addr_equal(&ifp->addr, addr)) {
1956 if (!dev || ifp->idev->dev == dev ||
1957 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1969 /* Gets referenced address, destroys ifaddr */
1971 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1974 ifp->flags |= IFA_F_DADFAILED;
1976 if (ifp->flags&IFA_F_TEMPORARY) {
1977 struct inet6_ifaddr *ifpub;
1978 spin_lock_bh(&ifp->lock);
1981 in6_ifa_hold(ifpub);
1982 spin_unlock_bh(&ifp->lock);
1983 ipv6_create_tempaddr(ifpub, ifp, true);
1986 spin_unlock_bh(&ifp->lock);
1989 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) {
1990 spin_lock_bh(&ifp->lock);
1991 addrconf_del_dad_work(ifp);
1992 ifp->flags |= IFA_F_TENTATIVE;
1994 ifp->flags &= ~IFA_F_OPTIMISTIC;
1995 spin_unlock_bh(&ifp->lock);
1997 ipv6_ifa_notify(0, ifp);
2004 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
2008 spin_lock_bh(&ifp->lock);
2009 if (ifp->state == INET6_IFADDR_STATE_DAD) {
2010 ifp->state = INET6_IFADDR_STATE_POSTDAD;
2013 spin_unlock_bh(&ifp->lock);
2018 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp)
2020 struct inet6_dev *idev = ifp->idev;
2021 struct net *net = dev_net(ifp->idev->dev);
2023 if (addrconf_dad_end(ifp)) {
2028 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n",
2029 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source);
2031 spin_lock_bh(&ifp->lock);
2033 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
2034 struct in6_addr new_addr;
2035 struct inet6_ifaddr *ifp2;
2036 int retries = ifp->stable_privacy_retry + 1;
2037 struct ifa6_config cfg = {
2039 .plen = ifp->prefix_len,
2040 .ifa_flags = ifp->flags,
2041 .valid_lft = ifp->valid_lft,
2042 .preferred_lft = ifp->prefered_lft,
2043 .scope = ifp->scope,
2046 if (retries > net->ipv6.sysctl.idgen_retries) {
2047 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
2048 ifp->idev->dev->name);
2052 new_addr = ifp->addr;
2053 if (ipv6_generate_stable_address(&new_addr, retries,
2057 spin_unlock_bh(&ifp->lock);
2059 if (idev->cnf.max_addresses &&
2060 ipv6_count_addresses(idev) >=
2061 idev->cnf.max_addresses)
2064 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
2065 ifp->idev->dev->name);
2067 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL);
2071 spin_lock_bh(&ifp2->lock);
2072 ifp2->stable_privacy_retry = retries;
2073 ifp2->state = INET6_IFADDR_STATE_PREDAD;
2074 spin_unlock_bh(&ifp2->lock);
2076 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
2079 spin_lock_bh(&ifp->lock);
2083 /* transition from _POSTDAD to _ERRDAD */
2084 ifp->state = INET6_IFADDR_STATE_ERRDAD;
2085 spin_unlock_bh(&ifp->lock);
2087 addrconf_mod_dad_work(ifp, 0);
2091 /* Join to solicited addr multicast group.
2092 * caller must hold RTNL */
2093 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
2095 struct in6_addr maddr;
2097 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2100 addrconf_addr_solict_mult(addr, &maddr);
2101 ipv6_dev_mc_inc(dev, &maddr);
2104 /* caller must hold RTNL */
2105 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
2107 struct in6_addr maddr;
2109 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2112 addrconf_addr_solict_mult(addr, &maddr);
2113 __ipv6_dev_mc_dec(idev, &maddr);
2116 /* caller must hold RTNL */
2117 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
2119 struct in6_addr addr;
2121 if (ifp->prefix_len >= 127) /* RFC 6164 */
2123 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2124 if (ipv6_addr_any(&addr))
2126 __ipv6_dev_ac_inc(ifp->idev, &addr);
2129 /* caller must hold RTNL */
2130 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
2132 struct in6_addr addr;
2134 if (ifp->prefix_len >= 127) /* RFC 6164 */
2136 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2137 if (ipv6_addr_any(&addr))
2139 __ipv6_dev_ac_dec(ifp->idev, &addr);
2142 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev)
2144 switch (dev->addr_len) {
2146 memcpy(eui, dev->dev_addr, 3);
2149 memcpy(eui + 5, dev->dev_addr + 3, 3);
2151 case EUI64_ADDR_LEN:
2152 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2162 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2164 union fwnet_hwaddr *ha;
2166 if (dev->addr_len != FWNET_ALEN)
2169 ha = (union fwnet_hwaddr *)dev->dev_addr;
2171 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2176 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2178 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2179 if (dev->addr_len != ARCNET_ALEN)
2182 eui[7] = *(u8 *)dev->dev_addr;
2186 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2188 if (dev->addr_len != INFINIBAND_ALEN)
2190 memcpy(eui, dev->dev_addr + 12, 8);
2195 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
2199 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2200 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2201 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2202 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2203 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2204 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2208 memcpy(eui + 4, &addr, 4);
2212 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2214 if (dev->priv_flags & IFF_ISATAP)
2215 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2219 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2221 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2224 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2226 memcpy(eui, dev->perm_addr, 3);
2227 memcpy(eui + 5, dev->perm_addr + 3, 3);
2234 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2236 switch (dev->type) {
2239 return addrconf_ifid_eui48(eui, dev);
2241 return addrconf_ifid_arcnet(eui, dev);
2242 case ARPHRD_INFINIBAND:
2243 return addrconf_ifid_infiniband(eui, dev);
2245 return addrconf_ifid_sit(eui, dev);
2248 return addrconf_ifid_gre(eui, dev);
2249 case ARPHRD_6LOWPAN:
2250 return addrconf_ifid_6lowpan(eui, dev);
2251 case ARPHRD_IEEE1394:
2252 return addrconf_ifid_ieee1394(eui, dev);
2253 case ARPHRD_TUNNEL6:
2256 return addrconf_ifid_ip6tnl(eui, dev);
2261 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2264 struct inet6_ifaddr *ifp;
2266 read_lock_bh(&idev->lock);
2267 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2268 if (ifp->scope > IFA_LINK)
2270 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2271 memcpy(eui, ifp->addr.s6_addr+8, 8);
2276 read_unlock_bh(&idev->lock);
2280 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
2281 static void ipv6_regen_rndid(struct inet6_dev *idev)
2284 get_random_bytes(idev->rndid, sizeof(idev->rndid));
2285 idev->rndid[0] &= ~0x02;
2288 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2289 * check if generated address is not inappropriate
2291 * - Reserved subnet anycast (RFC 2526)
2292 * 11111101 11....11 1xxxxxxx
2293 * - ISATAP (RFC4214) 6.1
2294 * 00-00-5E-FE-xx-xx-xx-xx
2296 * - XXX: already assigned to an address on the device
2298 if (idev->rndid[0] == 0xfd &&
2299 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2300 (idev->rndid[7]&0x80))
2302 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2303 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2305 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2310 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
2312 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
2313 ipv6_regen_rndid(idev);
2321 addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric,
2322 struct net_device *dev, unsigned long expires,
2323 u32 flags, gfp_t gfp_flags)
2325 struct fib6_config cfg = {
2326 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
2327 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF,
2328 .fc_ifindex = dev->ifindex,
2329 .fc_expires = expires,
2331 .fc_flags = RTF_UP | flags,
2332 .fc_nlinfo.nl_net = dev_net(dev),
2333 .fc_protocol = RTPROT_KERNEL,
2334 .fc_type = RTN_UNICAST,
2339 /* Prevent useless cloning on PtP SIT.
2340 This thing is done here expecting that the whole
2341 class of non-broadcast devices need not cloning.
2343 #if IS_ENABLED(CONFIG_IPV6_SIT)
2344 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2345 cfg.fc_flags |= RTF_NONEXTHOP;
2348 ip6_route_add(&cfg, gfp_flags, NULL);
2352 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2354 const struct net_device *dev,
2355 u32 flags, u32 noflags)
2357 struct fib6_node *fn;
2358 struct fib6_info *rt = NULL;
2359 struct fib6_table *table;
2360 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
2362 table = fib6_get_table(dev_net(dev), tb_id);
2367 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true);
2371 for_each_fib6_node_rt_rcu(fn) {
2372 if (rt->fib6_nh.nh_dev->ifindex != dev->ifindex)
2374 if ((rt->fib6_flags & flags) != flags)
2376 if ((rt->fib6_flags & noflags) != 0)
2378 if (!fib6_info_hold_safe(rt))
2388 /* Create "default" multicast route to the interface */
2390 static void addrconf_add_mroute(struct net_device *dev)
2392 struct fib6_config cfg = {
2393 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2394 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2395 .fc_ifindex = dev->ifindex,
2398 .fc_type = RTN_MULTICAST,
2399 .fc_nlinfo.nl_net = dev_net(dev),
2400 .fc_protocol = RTPROT_KERNEL,
2403 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2405 ip6_route_add(&cfg, GFP_KERNEL, NULL);
2408 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2410 struct inet6_dev *idev;
2414 idev = ipv6_find_idev(dev);
2416 return ERR_PTR(-ENOBUFS);
2418 if (idev->cnf.disable_ipv6)
2419 return ERR_PTR(-EACCES);
2421 /* Add default multicast route */
2422 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
2423 addrconf_add_mroute(dev);
2428 static void manage_tempaddrs(struct inet6_dev *idev,
2429 struct inet6_ifaddr *ifp,
2430 __u32 valid_lft, __u32 prefered_lft,
2431 bool create, unsigned long now)
2434 struct inet6_ifaddr *ift;
2436 read_lock_bh(&idev->lock);
2437 /* update all temporary addresses in the list */
2438 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2439 int age, max_valid, max_prefered;
2441 if (ifp != ift->ifpub)
2444 /* RFC 4941 section 3.3:
2445 * If a received option will extend the lifetime of a public
2446 * address, the lifetimes of temporary addresses should
2447 * be extended, subject to the overall constraint that no
2448 * temporary addresses should ever remain "valid" or "preferred"
2449 * for a time longer than (TEMP_VALID_LIFETIME) or
2450 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2452 age = (now - ift->cstamp) / HZ;
2453 max_valid = idev->cnf.temp_valid_lft - age;
2457 max_prefered = idev->cnf.temp_prefered_lft -
2458 idev->desync_factor - age;
2459 if (max_prefered < 0)
2462 if (valid_lft > max_valid)
2463 valid_lft = max_valid;
2465 if (prefered_lft > max_prefered)
2466 prefered_lft = max_prefered;
2468 spin_lock(&ift->lock);
2470 ift->valid_lft = valid_lft;
2471 ift->prefered_lft = prefered_lft;
2473 if (prefered_lft > 0)
2474 ift->flags &= ~IFA_F_DEPRECATED;
2476 spin_unlock(&ift->lock);
2477 if (!(flags&IFA_F_TENTATIVE))
2478 ipv6_ifa_notify(0, ift);
2481 if ((create || list_empty(&idev->tempaddr_list)) &&
2482 idev->cnf.use_tempaddr > 0) {
2483 /* When a new public address is created as described
2484 * in [ADDRCONF], also create a new temporary address.
2485 * Also create a temporary address if it's enabled but
2486 * no temporary address currently exists.
2488 read_unlock_bh(&idev->lock);
2489 ipv6_create_tempaddr(ifp, NULL, false);
2491 read_unlock_bh(&idev->lock);
2495 static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2497 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2498 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2501 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2502 const struct prefix_info *pinfo,
2503 struct inet6_dev *in6_dev,
2504 const struct in6_addr *addr, int addr_type,
2505 u32 addr_flags, bool sllao, bool tokenized,
2506 __u32 valid_lft, u32 prefered_lft)
2508 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2509 int create = 0, update_lft = 0;
2511 if (!ifp && valid_lft) {
2512 int max_addresses = in6_dev->cnf.max_addresses;
2513 struct ifa6_config cfg = {
2515 .plen = pinfo->prefix_len,
2516 .ifa_flags = addr_flags,
2517 .valid_lft = valid_lft,
2518 .preferred_lft = prefered_lft,
2519 .scope = addr_type & IPV6_ADDR_SCOPE_MASK,
2522 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2523 if ((net->ipv6.devconf_all->optimistic_dad ||
2524 in6_dev->cnf.optimistic_dad) &&
2525 !net->ipv6.devconf_all->forwarding && sllao)
2526 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
2529 /* Do not allow to create too much of autoconfigured
2530 * addresses; this would be too easy way to crash kernel.
2532 if (!max_addresses ||
2533 ipv6_count_addresses(in6_dev) < max_addresses)
2534 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL);
2536 if (IS_ERR_OR_NULL(ifp))
2540 spin_lock_bh(&ifp->lock);
2541 ifp->flags |= IFA_F_MANAGETEMPADDR;
2542 ifp->cstamp = jiffies;
2543 ifp->tokenized = tokenized;
2544 spin_unlock_bh(&ifp->lock);
2545 addrconf_dad_start(ifp);
2553 /* update lifetime (RFC2462 5.5.3 e) */
2554 spin_lock_bh(&ifp->lock);
2556 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2557 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2560 if (!create && stored_lft) {
2561 const u32 minimum_lft = min_t(u32,
2562 stored_lft, MIN_VALID_LIFETIME);
2563 valid_lft = max(valid_lft, minimum_lft);
2565 /* RFC4862 Section 5.5.3e:
2566 * "Note that the preferred lifetime of the
2567 * corresponding address is always reset to
2568 * the Preferred Lifetime in the received
2569 * Prefix Information option, regardless of
2570 * whether the valid lifetime is also reset or
2573 * So we should always update prefered_lft here.
2579 ifp->valid_lft = valid_lft;
2580 ifp->prefered_lft = prefered_lft;
2583 ifp->flags &= ~IFA_F_DEPRECATED;
2584 spin_unlock_bh(&ifp->lock);
2586 if (!(flags&IFA_F_TENTATIVE))
2587 ipv6_ifa_notify(0, ifp);
2589 spin_unlock_bh(&ifp->lock);
2591 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2600 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
2602 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2604 struct prefix_info *pinfo;
2609 struct inet6_dev *in6_dev;
2610 struct net *net = dev_net(dev);
2612 pinfo = (struct prefix_info *) opt;
2614 if (len < sizeof(struct prefix_info)) {
2615 netdev_dbg(dev, "addrconf: prefix option too short\n");
2620 * Validation checks ([ADDRCONF], page 19)
2623 addr_type = ipv6_addr_type(&pinfo->prefix);
2625 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2628 valid_lft = ntohl(pinfo->valid);
2629 prefered_lft = ntohl(pinfo->prefered);
2631 if (prefered_lft > valid_lft) {
2632 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2636 in6_dev = in6_dev_get(dev);
2639 net_dbg_ratelimited("addrconf: device %s not configured\n",
2645 * Two things going on here:
2646 * 1) Add routes for on-link prefixes
2647 * 2) Configure prefixes with the auto flag set
2650 if (pinfo->onlink) {
2651 struct fib6_info *rt;
2652 unsigned long rt_expires;
2654 /* Avoid arithmetic overflow. Really, we could
2655 * save rt_expires in seconds, likely valid_lft,
2656 * but it would require division in fib gc, that it
2660 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2662 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2664 if (addrconf_finite_timeout(rt_expires))
2667 rt = addrconf_get_prefix_route(&pinfo->prefix,
2670 RTF_ADDRCONF | RTF_PREFIX_RT,
2671 RTF_GATEWAY | RTF_DEFAULT);
2674 /* Autoconf prefix route */
2675 if (valid_lft == 0) {
2676 ip6_del_rt(net, rt);
2678 } else if (addrconf_finite_timeout(rt_expires)) {
2680 fib6_set_expires(rt, jiffies + rt_expires);
2682 fib6_clean_expires(rt);
2684 } else if (valid_lft) {
2685 clock_t expires = 0;
2686 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2687 if (addrconf_finite_timeout(rt_expires)) {
2689 flags |= RTF_EXPIRES;
2690 expires = jiffies_to_clock_t(rt_expires);
2692 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2693 0, dev, expires, flags,
2696 fib6_info_release(rt);
2699 /* Try to figure out our local address for this prefix */
2701 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2702 struct in6_addr addr;
2703 bool tokenized = false, dev_addr_generated = false;
2705 if (pinfo->prefix_len == 64) {
2706 memcpy(&addr, &pinfo->prefix, 8);
2708 if (!ipv6_addr_any(&in6_dev->token)) {
2709 read_lock_bh(&in6_dev->lock);
2710 memcpy(addr.s6_addr + 8,
2711 in6_dev->token.s6_addr + 8, 8);
2712 read_unlock_bh(&in6_dev->lock);
2714 } else if (is_addr_mode_generate_stable(in6_dev) &&
2715 !ipv6_generate_stable_address(&addr, 0,
2717 addr_flags |= IFA_F_STABLE_PRIVACY;
2719 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2720 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2723 dev_addr_generated = true;
2727 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2732 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2735 tokenized, valid_lft,
2740 /* Ignore error case here because previous prefix add addr was
2741 * successful which will be notified.
2743 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2744 addr_type, addr_flags, sllao,
2745 tokenized, valid_lft,
2747 dev_addr_generated);
2749 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2751 in6_dev_put(in6_dev);
2755 * Set destination address.
2756 * Special case for SIT interfaces where we create a new "virtual"
2759 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2761 struct in6_ifreq ireq;
2762 struct net_device *dev;
2768 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2771 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2777 #if IS_ENABLED(CONFIG_IPV6_SIT)
2778 if (dev->type == ARPHRD_SIT) {
2779 const struct net_device_ops *ops = dev->netdev_ops;
2781 struct ip_tunnel_parm p;
2783 err = -EADDRNOTAVAIL;
2784 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2787 memset(&p, 0, sizeof(p));
2788 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2792 p.iph.protocol = IPPROTO_IPV6;
2794 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2796 if (ops->ndo_do_ioctl) {
2797 mm_segment_t oldfs = get_fs();
2800 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2807 dev = __dev_get_by_name(net, p.name);
2810 err = dev_open(dev);
2820 static int ipv6_mc_config(struct sock *sk, bool join,
2821 const struct in6_addr *addr, int ifindex)
2829 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2831 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2838 * Manual configuration of address on an interface
2840 static int inet6_addr_add(struct net *net, int ifindex,
2841 struct ifa6_config *cfg,
2842 struct netlink_ext_ack *extack)
2844 struct inet6_ifaddr *ifp;
2845 struct inet6_dev *idev;
2846 struct net_device *dev;
2847 unsigned long timeout;
2853 if (cfg->plen > 128)
2856 /* check the lifetime */
2857 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
2860 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64)
2863 dev = __dev_get_by_index(net, ifindex);
2867 idev = addrconf_add_dev(dev);
2869 return PTR_ERR(idev);
2871 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
2872 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2873 true, cfg->pfx, ifindex);
2879 cfg->scope = ipv6_addr_scope(cfg->pfx);
2881 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
2882 if (addrconf_finite_timeout(timeout)) {
2883 expires = jiffies_to_clock_t(timeout * HZ);
2884 cfg->valid_lft = timeout;
2885 flags = RTF_EXPIRES;
2889 cfg->ifa_flags |= IFA_F_PERMANENT;
2892 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
2893 if (addrconf_finite_timeout(timeout)) {
2895 cfg->ifa_flags |= IFA_F_DEPRECATED;
2896 cfg->preferred_lft = timeout;
2899 ifp = ipv6_add_addr(idev, cfg, true, extack);
2901 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
2902 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
2903 ifp->rt_priority, dev, expires,
2907 /* Send a netlink notification if DAD is enabled and
2908 * optimistic flag is not set
2910 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD)))
2911 ipv6_ifa_notify(0, ifp);
2913 * Note that section 3.1 of RFC 4429 indicates
2914 * that the Optimistic flag should not be set for
2915 * manually configured addresses
2917 addrconf_dad_start(ifp);
2918 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR)
2919 manage_tempaddrs(idev, ifp, cfg->valid_lft,
2920 cfg->preferred_lft, true, jiffies);
2922 addrconf_verify_rtnl();
2924 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
2925 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false,
2929 return PTR_ERR(ifp);
2932 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2933 const struct in6_addr *pfx, unsigned int plen)
2935 struct inet6_ifaddr *ifp;
2936 struct inet6_dev *idev;
2937 struct net_device *dev;
2942 dev = __dev_get_by_index(net, ifindex);
2946 idev = __in6_dev_get(dev);
2950 read_lock_bh(&idev->lock);
2951 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2952 if (ifp->prefix_len == plen &&
2953 ipv6_addr_equal(pfx, &ifp->addr)) {
2955 read_unlock_bh(&idev->lock);
2957 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2958 (ifa_flags & IFA_F_MANAGETEMPADDR))
2959 manage_tempaddrs(idev, ifp, 0, 0, false,
2962 addrconf_verify_rtnl();
2963 if (ipv6_addr_is_multicast(pfx)) {
2964 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2965 false, pfx, dev->ifindex);
2970 read_unlock_bh(&idev->lock);
2971 return -EADDRNOTAVAIL;
2975 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2977 struct ifa6_config cfg = {
2978 .ifa_flags = IFA_F_PERMANENT,
2979 .preferred_lft = INFINITY_LIFE_TIME,
2980 .valid_lft = INFINITY_LIFE_TIME,
2982 struct in6_ifreq ireq;
2985 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2988 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2991 cfg.pfx = &ireq.ifr6_addr;
2992 cfg.plen = ireq.ifr6_prefixlen;
2995 err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL);
3000 int addrconf_del_ifaddr(struct net *net, void __user *arg)
3002 struct in6_ifreq ireq;
3005 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3008 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3012 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
3013 ireq.ifr6_prefixlen);
3018 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
3019 int plen, int scope)
3021 struct inet6_ifaddr *ifp;
3022 struct ifa6_config cfg = {
3025 .ifa_flags = IFA_F_PERMANENT,
3026 .valid_lft = INFINITY_LIFE_TIME,
3027 .preferred_lft = INFINITY_LIFE_TIME,
3031 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
3033 spin_lock_bh(&ifp->lock);
3034 ifp->flags &= ~IFA_F_TENTATIVE;
3035 spin_unlock_bh(&ifp->lock);
3036 rt_genid_bump_ipv6(dev_net(idev->dev));
3037 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3042 #if IS_ENABLED(CONFIG_IPV6_SIT)
3043 static void sit_add_v4_addrs(struct inet6_dev *idev)
3045 struct in6_addr addr;
3046 struct net_device *dev;
3047 struct net *net = dev_net(idev->dev);
3053 memset(&addr, 0, sizeof(struct in6_addr));
3054 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
3056 if (idev->dev->flags&IFF_POINTOPOINT) {
3057 addr.s6_addr32[0] = htonl(0xfe800000);
3061 scope = IPV6_ADDR_COMPATv4;
3063 pflags |= RTF_NONEXTHOP;
3066 if (addr.s6_addr32[3]) {
3067 add_addr(idev, &addr, plen, scope);
3068 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags,
3073 for_each_netdev(net, dev) {
3074 struct in_device *in_dev = __in_dev_get_rtnl(dev);
3075 if (in_dev && (dev->flags & IFF_UP)) {
3076 struct in_ifaddr *ifa;
3080 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
3082 addr.s6_addr32[3] = ifa->ifa_local;
3084 if (ifa->ifa_scope == RT_SCOPE_LINK)
3086 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
3087 if (idev->dev->flags&IFF_POINTOPOINT)
3092 add_addr(idev, &addr, plen, flag);
3093 addrconf_prefix_route(&addr, plen, 0, idev->dev,
3094 0, pflags, GFP_KERNEL);
3101 static void init_loopback(struct net_device *dev)
3103 struct inet6_dev *idev;
3109 idev = ipv6_find_idev(dev);
3111 pr_debug("%s: add_dev failed\n", __func__);
3115 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
3118 void addrconf_add_linklocal(struct inet6_dev *idev,
3119 const struct in6_addr *addr, u32 flags)
3121 struct ifa6_config cfg = {
3124 .ifa_flags = flags | IFA_F_PERMANENT,
3125 .valid_lft = INFINITY_LIFE_TIME,
3126 .preferred_lft = INFINITY_LIFE_TIME,
3129 struct inet6_ifaddr *ifp;
3131 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3132 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad ||
3133 idev->cnf.optimistic_dad) &&
3134 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
3135 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
3138 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
3140 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev,
3142 addrconf_dad_start(ifp);
3146 EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
3148 static bool ipv6_reserved_interfaceid(struct in6_addr address)
3150 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3153 if (address.s6_addr32[2] == htonl(0x02005eff) &&
3154 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3157 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3158 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3164 static int ipv6_generate_stable_address(struct in6_addr *address,
3166 const struct inet6_dev *idev)
3168 static DEFINE_SPINLOCK(lock);
3169 static __u32 digest[SHA_DIGEST_WORDS];
3170 static __u32 workspace[SHA_WORKSPACE_WORDS];
3173 char __data[SHA_MESSAGE_BYTES];
3175 struct in6_addr secret;
3177 unsigned char hwaddr[MAX_ADDR_LEN];
3182 struct in6_addr secret;
3183 struct in6_addr temp;
3184 struct net *net = dev_net(idev->dev);
3186 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3188 if (idev->cnf.stable_secret.initialized)
3189 secret = idev->cnf.stable_secret.secret;
3190 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3191 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3196 spin_lock_bh(&lock);
3199 memset(&data, 0, sizeof(data));
3200 memset(workspace, 0, sizeof(workspace));
3201 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3202 data.prefix[0] = address->s6_addr32[0];
3203 data.prefix[1] = address->s6_addr32[1];
3204 data.secret = secret;
3205 data.dad_count = dad_count;
3207 sha_transform(digest, data.__data, workspace);
3210 temp.s6_addr32[2] = (__force __be32)digest[0];
3211 temp.s6_addr32[3] = (__force __be32)digest[1];
3213 spin_unlock_bh(&lock);
3215 if (ipv6_reserved_interfaceid(temp)) {
3217 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3226 static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3228 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3232 s = &idev->cnf.stable_secret;
3233 get_random_bytes(&s->secret, sizeof(s->secret));
3234 s->initialized = true;
3237 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3239 struct in6_addr addr;
3241 /* no link local addresses on L3 master devices */
3242 if (netif_is_l3_master(idev->dev))
3245 /* no link local addresses on devices flagged as slaves */
3246 if (idev->dev->flags & IFF_SLAVE)
3249 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3251 switch (idev->cnf.addr_gen_mode) {
3252 case IN6_ADDR_GEN_MODE_RANDOM:
3253 ipv6_gen_mode_random_init(idev);
3255 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
3256 if (!ipv6_generate_stable_address(&addr, 0, idev))
3257 addrconf_add_linklocal(idev, &addr,
3258 IFA_F_STABLE_PRIVACY);
3259 else if (prefix_route)
3260 addrconf_prefix_route(&addr, 64, 0, idev->dev,
3263 case IN6_ADDR_GEN_MODE_EUI64:
3264 /* addrconf_add_linklocal also adds a prefix_route and we
3265 * only need to care about prefix routes if ipv6_generate_eui64
3266 * couldn't generate one.
3268 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3269 addrconf_add_linklocal(idev, &addr, 0);
3270 else if (prefix_route)
3271 addrconf_prefix_route(&addr, 64, 0, idev->dev,
3274 case IN6_ADDR_GEN_MODE_NONE:
3276 /* will not add any link local address */
3281 static void addrconf_dev_config(struct net_device *dev)
3283 struct inet6_dev *idev;
3287 if ((dev->type != ARPHRD_ETHER) &&
3288 (dev->type != ARPHRD_FDDI) &&
3289 (dev->type != ARPHRD_ARCNET) &&
3290 (dev->type != ARPHRD_INFINIBAND) &&
3291 (dev->type != ARPHRD_IEEE1394) &&
3292 (dev->type != ARPHRD_TUNNEL6) &&
3293 (dev->type != ARPHRD_6LOWPAN) &&
3294 (dev->type != ARPHRD_IP6GRE) &&
3295 (dev->type != ARPHRD_IPGRE) &&
3296 (dev->type != ARPHRD_TUNNEL) &&
3297 (dev->type != ARPHRD_NONE) &&
3298 (dev->type != ARPHRD_RAWIP)) {
3299 /* Alas, we support only Ethernet autoconfiguration. */
3300 idev = __in6_dev_get(dev);
3301 if (!IS_ERR_OR_NULL(idev) && dev->flags & IFF_UP &&
3302 dev->flags & IFF_MULTICAST)
3307 idev = addrconf_add_dev(dev);
3311 /* this device type has no EUI support */
3312 if (dev->type == ARPHRD_NONE &&
3313 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3314 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
3316 addrconf_addr_gen(idev, false);
3319 #if IS_ENABLED(CONFIG_IPV6_SIT)
3320 static void addrconf_sit_config(struct net_device *dev)
3322 struct inet6_dev *idev;
3327 * Configure the tunnel with one of our IPv4
3328 * addresses... we should configure all of
3329 * our v4 addrs in the tunnel
3332 idev = ipv6_find_idev(dev);
3334 pr_debug("%s: add_dev failed\n", __func__);
3338 if (dev->priv_flags & IFF_ISATAP) {
3339 addrconf_addr_gen(idev, false);
3343 sit_add_v4_addrs(idev);
3345 if (dev->flags&IFF_POINTOPOINT)
3346 addrconf_add_mroute(dev);
3350 #if IS_ENABLED(CONFIG_NET_IPGRE)
3351 static void addrconf_gre_config(struct net_device *dev)
3353 struct inet6_dev *idev;
3357 idev = ipv6_find_idev(dev);
3359 pr_debug("%s: add_dev failed\n", __func__);
3363 addrconf_addr_gen(idev, true);
3364 if (dev->flags & IFF_POINTOPOINT)
3365 addrconf_add_mroute(dev);
3369 static int fixup_permanent_addr(struct net *net,
3370 struct inet6_dev *idev,
3371 struct inet6_ifaddr *ifp)
3373 /* !fib6_node means the host route was removed from the
3374 * FIB, for example, if 'lo' device is taken down. In that
3375 * case regenerate the host route.
3377 if (!ifp->rt || !ifp->rt->fib6_node) {
3378 struct fib6_info *f6i, *prev;
3380 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false,
3383 return PTR_ERR(f6i);
3385 /* ifp->rt can be accessed outside of rtnl */
3386 spin_lock(&ifp->lock);
3389 spin_unlock(&ifp->lock);
3391 fib6_info_release(prev);
3394 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3395 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3396 ifp->rt_priority, idev->dev, 0, 0,
3400 if (ifp->state == INET6_IFADDR_STATE_PREDAD)
3401 addrconf_dad_start(ifp);
3406 static void addrconf_permanent_addr(struct net *net, struct net_device *dev)
3408 struct inet6_ifaddr *ifp, *tmp;
3409 struct inet6_dev *idev;
3411 idev = __in6_dev_get(dev);
3415 write_lock_bh(&idev->lock);
3417 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3418 if ((ifp->flags & IFA_F_PERMANENT) &&
3419 fixup_permanent_addr(net, idev, ifp) < 0) {
3420 write_unlock_bh(&idev->lock);
3423 write_lock_bh(&idev->lock);
3425 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3426 idev->dev->name, &ifp->addr);
3430 write_unlock_bh(&idev->lock);
3433 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3436 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3437 struct netdev_notifier_change_info *change_info;
3438 struct netdev_notifier_changeupper_info *info;
3439 struct inet6_dev *idev = __in6_dev_get(dev);
3440 struct net *net = dev_net(dev);
3441 int run_pending = 0;
3445 case NETDEV_REGISTER:
3446 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3447 idev = ipv6_add_dev(dev);
3449 return notifier_from_errno(PTR_ERR(idev));
3453 case NETDEV_CHANGEMTU:
3454 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3455 if (dev->mtu < IPV6_MIN_MTU) {
3456 addrconf_ifdown(dev, dev != net->loopback_dev);
3461 rt6_mtu_change(dev, dev->mtu);
3462 idev->cnf.mtu6 = dev->mtu;
3466 /* allocate new idev */
3467 idev = ipv6_add_dev(dev);
3471 /* device is still not ready */
3472 if (!(idev->if_flags & IF_READY))
3481 if (dev->flags & IFF_SLAVE)
3484 if (idev && idev->cnf.disable_ipv6)
3487 if (event == NETDEV_UP) {
3488 /* restore routes for permanent addresses */
3489 addrconf_permanent_addr(net, dev);
3491 if (!addrconf_link_ready(dev)) {
3492 /* device is not ready yet. */
3493 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3498 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3499 idev = ipv6_add_dev(dev);
3501 if (!IS_ERR_OR_NULL(idev)) {
3502 idev->if_flags |= IF_READY;
3505 } else if (event == NETDEV_CHANGE) {
3506 if (!addrconf_link_ready(dev)) {
3507 /* device is still not ready. */
3508 rt6_sync_down_dev(dev, event);
3512 if (!IS_ERR_OR_NULL(idev)) {
3513 if (idev->if_flags & IF_READY) {
3514 /* device is already configured -
3515 * but resend MLD reports, we might
3516 * have roamed and need to update
3517 * multicast snooping switches
3521 if (change_info->flags_changed & IFF_NOARP)
3522 addrconf_dad_run(idev, true);
3523 rt6_sync_up(dev, RTNH_F_LINKDOWN);
3526 idev->if_flags |= IF_READY;
3529 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3535 switch (dev->type) {
3536 #if IS_ENABLED(CONFIG_IPV6_SIT)
3538 addrconf_sit_config(dev);
3541 #if IS_ENABLED(CONFIG_NET_IPGRE)
3543 addrconf_gre_config(dev);
3546 case ARPHRD_LOOPBACK:
3551 addrconf_dev_config(dev);
3555 if (!IS_ERR_OR_NULL(idev)) {
3557 addrconf_dad_run(idev, false);
3559 /* Device has an address by now */
3560 rt6_sync_up(dev, RTNH_F_DEAD);
3563 * If the MTU changed during the interface down,
3564 * when the interface up, the changed MTU must be
3565 * reflected in the idev as well as routers.
3567 if (idev->cnf.mtu6 != dev->mtu &&
3568 dev->mtu >= IPV6_MIN_MTU) {
3569 rt6_mtu_change(dev, dev->mtu);
3570 idev->cnf.mtu6 = dev->mtu;
3572 idev->tstamp = jiffies;
3573 inet6_ifinfo_notify(RTM_NEWLINK, idev);
3576 * If the changed mtu during down is lower than
3577 * IPV6_MIN_MTU stop IPv6 on this interface.
3579 if (dev->mtu < IPV6_MIN_MTU)
3580 addrconf_ifdown(dev, dev != net->loopback_dev);
3585 case NETDEV_UNREGISTER:
3587 * Remove all addresses from this interface.
3589 addrconf_ifdown(dev, event != NETDEV_DOWN);
3592 case NETDEV_CHANGENAME:
3594 snmp6_unregister_dev(idev);
3595 addrconf_sysctl_unregister(idev);
3596 err = addrconf_sysctl_register(idev);
3598 return notifier_from_errno(err);
3599 err = snmp6_register_dev(idev);
3601 addrconf_sysctl_unregister(idev);
3602 return notifier_from_errno(err);
3607 case NETDEV_PRE_TYPE_CHANGE:
3608 case NETDEV_POST_TYPE_CHANGE:
3610 addrconf_type_change(dev, event);
3613 case NETDEV_CHANGEUPPER:
3616 /* flush all routes if dev is linked to or unlinked from
3617 * an L3 master device (e.g., VRF)
3619 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3620 addrconf_ifdown(dev, 0);
3627 * addrconf module should be notified of a device going up
3629 static struct notifier_block ipv6_dev_notf = {
3630 .notifier_call = addrconf_notify,
3631 .priority = ADDRCONF_NOTIFY_PRIORITY,
3634 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3636 struct inet6_dev *idev;
3639 idev = __in6_dev_get(dev);
3641 if (event == NETDEV_POST_TYPE_CHANGE)
3642 ipv6_mc_remap(idev);
3643 else if (event == NETDEV_PRE_TYPE_CHANGE)
3644 ipv6_mc_unmap(idev);
3647 static bool addr_is_local(const struct in6_addr *addr)
3649 return ipv6_addr_type(addr) &
3650 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3653 static int addrconf_ifdown(struct net_device *dev, int how)
3655 unsigned long event = how ? NETDEV_UNREGISTER : NETDEV_DOWN;
3656 struct net *net = dev_net(dev);
3657 struct inet6_dev *idev;
3658 struct inet6_ifaddr *ifa, *tmp;
3659 bool keep_addr = false;
3664 rt6_disable_ip(dev, event);
3666 idev = __in6_dev_get(dev);
3671 * Step 1: remove reference to ipv6 device from parent device.
3677 /* protected by rtnl_lock */
3678 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3680 /* Step 1.5: remove snmp6 entry */
3681 snmp6_unregister_dev(idev);
3685 /* combine the user config with event to determine if permanent
3686 * addresses are to be removed from address hash table
3688 if (!how && !idev->cnf.disable_ipv6) {
3689 /* aggregate the system setting and interface setting */
3690 int _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3693 _keep_addr = idev->cnf.keep_addr_on_down;
3695 keep_addr = (_keep_addr > 0);
3698 /* Step 2: clear hash table */
3699 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3700 struct hlist_head *h = &inet6_addr_lst[i];
3702 spin_lock_bh(&addrconf_hash_lock);
3704 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3705 if (ifa->idev == idev) {
3706 addrconf_del_dad_work(ifa);
3707 /* combined flag + permanent flag decide if
3708 * address is retained on a down event
3711 !(ifa->flags & IFA_F_PERMANENT) ||
3712 addr_is_local(&ifa->addr)) {
3713 hlist_del_init_rcu(&ifa->addr_lst);
3718 spin_unlock_bh(&addrconf_hash_lock);
3721 write_lock_bh(&idev->lock);
3723 addrconf_del_rs_timer(idev);
3725 /* Step 2: clear flags for stateless addrconf */
3727 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3729 /* Step 3: clear tempaddr list */
3730 while (!list_empty(&idev->tempaddr_list)) {
3731 ifa = list_first_entry(&idev->tempaddr_list,
3732 struct inet6_ifaddr, tmp_list);
3733 list_del(&ifa->tmp_list);
3734 write_unlock_bh(&idev->lock);
3735 spin_lock_bh(&ifa->lock);
3738 in6_ifa_put(ifa->ifpub);
3741 spin_unlock_bh(&ifa->lock);
3743 write_lock_bh(&idev->lock);
3746 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
3747 struct fib6_info *rt = NULL;
3750 addrconf_del_dad_work(ifa);
3752 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3753 !addr_is_local(&ifa->addr);
3755 write_unlock_bh(&idev->lock);
3756 spin_lock_bh(&ifa->lock);
3759 /* set state to skip the notifier below */
3760 state = INET6_IFADDR_STATE_DEAD;
3761 ifa->state = INET6_IFADDR_STATE_PREDAD;
3762 if (!(ifa->flags & IFA_F_NODAD))
3763 ifa->flags |= IFA_F_TENTATIVE;
3769 ifa->state = INET6_IFADDR_STATE_DEAD;
3772 spin_unlock_bh(&ifa->lock);
3775 ip6_del_rt(net, rt);
3777 if (state != INET6_IFADDR_STATE_DEAD) {
3778 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3779 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3781 if (idev->cnf.forwarding)
3782 addrconf_leave_anycast(ifa);
3783 addrconf_leave_solict(ifa->idev, &ifa->addr);
3786 write_lock_bh(&idev->lock);
3788 list_del_rcu(&ifa->if_list);
3793 write_unlock_bh(&idev->lock);
3795 /* Step 5: Discard anycast and multicast list */
3797 ipv6_ac_destroy_dev(idev);
3798 ipv6_mc_destroy_dev(idev);
3803 idev->tstamp = jiffies;
3805 /* Last: Shot the device (if unregistered) */
3807 addrconf_sysctl_unregister(idev);
3808 neigh_parms_release(&nd_tbl, idev->nd_parms);
3809 neigh_ifdown(&nd_tbl, dev);
3815 static void addrconf_rs_timer(struct timer_list *t)
3817 struct inet6_dev *idev = from_timer(idev, t, rs_timer);
3818 struct net_device *dev = idev->dev;
3819 struct in6_addr lladdr;
3821 write_lock(&idev->lock);
3822 if (idev->dead || !(idev->if_flags & IF_READY))
3825 if (!ipv6_accept_ra(idev))
3828 /* Announcement received after solicitation was sent */
3829 if (idev->if_flags & IF_RA_RCVD)
3832 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
3833 write_unlock(&idev->lock);
3834 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3835 ndisc_send_rs(dev, &lladdr,
3836 &in6addr_linklocal_allrouters);
3840 write_lock(&idev->lock);
3841 idev->rs_interval = rfc3315_s14_backoff_update(
3842 idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
3843 /* The wait after the last probe can be shorter */
3844 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3845 idev->cnf.rtr_solicits) ?
3846 idev->cnf.rtr_solicit_delay :
3850 * Note: we do not support deprecated "all on-link"
3851 * assumption any longer.
3853 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3857 write_unlock(&idev->lock);
3863 * Duplicate Address Detection
3865 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3867 unsigned long rand_num;
3868 struct inet6_dev *idev = ifp->idev;
3871 if (ifp->flags & IFA_F_OPTIMISTIC)
3874 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3877 if (idev->cnf.enhanced_dad ||
3878 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) {
3880 get_random_bytes(&nonce, 6);
3883 ifp->dad_nonce = nonce;
3884 ifp->dad_probes = idev->cnf.dad_transmits;
3885 addrconf_mod_dad_work(ifp, rand_num);
3888 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3890 struct inet6_dev *idev = ifp->idev;
3891 struct net_device *dev = idev->dev;
3892 bool bump_id, notify = false;
3895 addrconf_join_solict(dev, &ifp->addr);
3897 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3899 read_lock_bh(&idev->lock);
3900 spin_lock(&ifp->lock);
3901 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3905 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3906 (net->ipv6.devconf_all->accept_dad < 1 &&
3907 idev->cnf.accept_dad < 1) ||
3908 !(ifp->flags&IFA_F_TENTATIVE) ||
3909 ifp->flags & IFA_F_NODAD) {
3910 bool send_na = false;
3912 if (ifp->flags & IFA_F_TENTATIVE &&
3913 !(ifp->flags & IFA_F_OPTIMISTIC))
3915 bump_id = ifp->flags & IFA_F_TENTATIVE;
3916 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3917 spin_unlock(&ifp->lock);
3918 read_unlock_bh(&idev->lock);
3920 addrconf_dad_completed(ifp, bump_id, send_na);
3924 if (!(idev->if_flags & IF_READY)) {
3925 spin_unlock(&ifp->lock);
3926 read_unlock_bh(&idev->lock);
3928 * If the device is not ready:
3929 * - keep it tentative if it is a permanent address.
3930 * - otherwise, kill it.
3933 addrconf_dad_stop(ifp, 0);
3938 * Optimistic nodes can start receiving
3941 if (ifp->flags & IFA_F_OPTIMISTIC) {
3942 ip6_ins_rt(net, ifp->rt);
3943 if (ipv6_use_optimistic_addr(net, idev)) {
3944 /* Because optimistic nodes can use this address,
3945 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3951 addrconf_dad_kick(ifp);
3953 spin_unlock(&ifp->lock);
3954 read_unlock_bh(&idev->lock);
3956 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3959 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3961 bool begin_dad = false;
3963 spin_lock_bh(&ifp->lock);
3964 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3965 ifp->state = INET6_IFADDR_STATE_PREDAD;
3968 spin_unlock_bh(&ifp->lock);
3971 addrconf_mod_dad_work(ifp, 0);
3974 static void addrconf_dad_work(struct work_struct *w)
3976 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3977 struct inet6_ifaddr,
3979 struct inet6_dev *idev = ifp->idev;
3980 bool bump_id, disable_ipv6 = false;
3981 struct in6_addr mcaddr;
3987 } action = DAD_PROCESS;
3991 spin_lock_bh(&ifp->lock);
3992 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3994 ifp->state = INET6_IFADDR_STATE_DAD;
3995 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3997 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3999 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 ||
4000 idev->cnf.accept_dad > 1) &&
4001 !idev->cnf.disable_ipv6 &&
4002 !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
4003 struct in6_addr addr;
4005 addr.s6_addr32[0] = htonl(0xfe800000);
4006 addr.s6_addr32[1] = 0;
4008 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
4009 ipv6_addr_equal(&ifp->addr, &addr)) {
4010 /* DAD failed for link-local based on MAC */
4011 idev->cnf.disable_ipv6 = 1;
4013 pr_info("%s: IPv6 being disabled!\n",
4014 ifp->idev->dev->name);
4015 disable_ipv6 = true;
4019 spin_unlock_bh(&ifp->lock);
4021 if (action == DAD_BEGIN) {
4022 addrconf_dad_begin(ifp);
4024 } else if (action == DAD_ABORT) {
4026 addrconf_dad_stop(ifp, 1);
4028 addrconf_ifdown(idev->dev, 0);
4032 if (!ifp->dad_probes && addrconf_dad_end(ifp))
4035 write_lock_bh(&idev->lock);
4036 if (idev->dead || !(idev->if_flags & IF_READY)) {
4037 write_unlock_bh(&idev->lock);
4041 spin_lock(&ifp->lock);
4042 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
4043 spin_unlock(&ifp->lock);
4044 write_unlock_bh(&idev->lock);
4048 if (ifp->dad_probes == 0) {
4049 bool send_na = false;
4052 * DAD was successful
4055 if (ifp->flags & IFA_F_TENTATIVE &&
4056 !(ifp->flags & IFA_F_OPTIMISTIC))
4058 bump_id = ifp->flags & IFA_F_TENTATIVE;
4059 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
4060 spin_unlock(&ifp->lock);
4061 write_unlock_bh(&idev->lock);
4063 addrconf_dad_completed(ifp, bump_id, send_na);
4069 addrconf_mod_dad_work(ifp,
4070 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
4071 spin_unlock(&ifp->lock);
4072 write_unlock_bh(&idev->lock);
4074 /* send a neighbour solicitation for our addr */
4075 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
4076 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
4083 /* ifp->idev must be at least read locked */
4084 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
4086 struct inet6_ifaddr *ifpiter;
4087 struct inet6_dev *idev = ifp->idev;
4089 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
4090 if (ifpiter->scope > IFA_LINK)
4092 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
4093 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
4094 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
4101 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
4104 struct net_device *dev = ifp->idev->dev;
4105 struct in6_addr lladdr;
4106 bool send_rs, send_mld;
4108 addrconf_del_dad_work(ifp);
4111 * Configure the address for reception. Now it is valid.
4114 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4116 /* If added prefix is link local and we are prepared to process
4117 router advertisements, start sending router solicitations.
4120 read_lock_bh(&ifp->idev->lock);
4121 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
4122 send_rs = send_mld &&
4123 ipv6_accept_ra(ifp->idev) &&
4124 ifp->idev->cnf.rtr_solicits != 0 &&
4125 (dev->flags&IFF_LOOPBACK) == 0;
4126 read_unlock_bh(&ifp->idev->lock);
4128 /* While dad is in progress mld report's source address is in6_addrany.
4129 * Resend with proper ll now.
4132 ipv6_mc_dad_complete(ifp->idev);
4134 /* send unsolicited NA if enabled */
4136 (ifp->idev->cnf.ndisc_notify ||
4137 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) {
4138 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr,
4139 /*router=*/ !!ifp->idev->cnf.forwarding,
4140 /*solicited=*/ false, /*override=*/ true,
4146 * If a host as already performed a random delay
4147 * [...] as part of DAD [...] there is no need
4148 * to delay again before sending the first RS
4150 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
4152 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
4154 write_lock_bh(&ifp->idev->lock);
4155 spin_lock(&ifp->lock);
4156 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4157 ifp->idev->cnf.rtr_solicit_interval);
4158 ifp->idev->rs_probes = 1;
4159 ifp->idev->if_flags |= IF_RS_SENT;
4160 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
4161 spin_unlock(&ifp->lock);
4162 write_unlock_bh(&ifp->idev->lock);
4166 rt_genid_bump_ipv6(dev_net(dev));
4168 /* Make sure that a new temporary address will be created
4169 * before this temporary address becomes deprecated.
4171 if (ifp->flags & IFA_F_TEMPORARY)
4172 addrconf_verify_rtnl();
4175 static void addrconf_dad_run(struct inet6_dev *idev, bool restart)
4177 struct inet6_ifaddr *ifp;
4179 read_lock_bh(&idev->lock);
4180 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4181 spin_lock(&ifp->lock);
4182 if ((ifp->flags & IFA_F_TENTATIVE &&
4183 ifp->state == INET6_IFADDR_STATE_DAD) || restart) {
4185 ifp->state = INET6_IFADDR_STATE_PREDAD;
4186 addrconf_dad_kick(ifp);
4188 spin_unlock(&ifp->lock);
4190 read_unlock_bh(&idev->lock);
4193 #ifdef CONFIG_PROC_FS
4194 struct if6_iter_state {
4195 struct seq_net_private p;
4200 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
4202 struct if6_iter_state *state = seq->private;
4203 struct net *net = seq_file_net(seq);
4204 struct inet6_ifaddr *ifa = NULL;
4207 /* initial bucket if pos is 0 */
4213 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
4214 hlist_for_each_entry_rcu(ifa, &inet6_addr_lst[state->bucket],
4216 if (!net_eq(dev_net(ifa->idev->dev), net))
4218 /* sync with offset */
4219 if (p < state->offset) {
4226 /* prepare for next bucket */
4233 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4234 struct inet6_ifaddr *ifa)
4236 struct if6_iter_state *state = seq->private;
4237 struct net *net = seq_file_net(seq);
4239 hlist_for_each_entry_continue_rcu(ifa, addr_lst) {
4240 if (!net_eq(dev_net(ifa->idev->dev), net))
4247 while (++state->bucket < IN6_ADDR_HSIZE) {
4248 hlist_for_each_entry_rcu(ifa,
4249 &inet6_addr_lst[state->bucket], addr_lst) {
4250 if (!net_eq(dev_net(ifa->idev->dev), net))
4259 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4263 return if6_get_first(seq, *pos);
4266 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4268 struct inet6_ifaddr *ifa;
4270 ifa = if6_get_next(seq, v);
4275 static void if6_seq_stop(struct seq_file *seq, void *v)
4281 static int if6_seq_show(struct seq_file *seq, void *v)
4283 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4284 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
4286 ifp->idev->dev->ifindex,
4290 ifp->idev->dev->name);
4294 static const struct seq_operations if6_seq_ops = {
4295 .start = if6_seq_start,
4296 .next = if6_seq_next,
4297 .show = if6_seq_show,
4298 .stop = if6_seq_stop,
4301 static int __net_init if6_proc_net_init(struct net *net)
4303 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops,
4304 sizeof(struct if6_iter_state)))
4309 static void __net_exit if6_proc_net_exit(struct net *net)
4311 remove_proc_entry("if_inet6", net->proc_net);
4314 static struct pernet_operations if6_proc_net_ops = {
4315 .init = if6_proc_net_init,
4316 .exit = if6_proc_net_exit,
4319 int __init if6_proc_init(void)
4321 return register_pernet_subsys(&if6_proc_net_ops);
4324 void if6_proc_exit(void)
4326 unregister_pernet_subsys(&if6_proc_net_ops);
4328 #endif /* CONFIG_PROC_FS */
4330 #if IS_ENABLED(CONFIG_IPV6_MIP6)
4331 /* Check if address is a home address configured on any interface. */
4332 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
4334 unsigned int hash = inet6_addr_hash(net, addr);
4335 struct inet6_ifaddr *ifp = NULL;
4339 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
4340 if (!net_eq(dev_net(ifp->idev->dev), net))
4342 if (ipv6_addr_equal(&ifp->addr, addr) &&
4343 (ifp->flags & IFA_F_HOMEADDRESS)) {
4354 * Periodic address status verification
4357 static void addrconf_verify_rtnl(void)
4359 unsigned long now, next, next_sec, next_sched;
4360 struct inet6_ifaddr *ifp;
4367 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
4369 cancel_delayed_work(&addr_chk_work);
4371 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
4373 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
4376 /* When setting preferred_lft to a value not zero or
4377 * infinity, while valid_lft is infinity
4378 * IFA_F_PERMANENT has a non-infinity life time.
4380 if ((ifp->flags & IFA_F_PERMANENT) &&
4381 (ifp->prefered_lft == INFINITY_LIFE_TIME))
4384 spin_lock(&ifp->lock);
4385 /* We try to batch several events at once. */
4386 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
4388 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4389 age >= ifp->valid_lft) {
4390 spin_unlock(&ifp->lock);
4394 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4395 spin_unlock(&ifp->lock);
4397 } else if (age >= ifp->prefered_lft) {
4398 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
4401 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4403 ifp->flags |= IFA_F_DEPRECATED;
4406 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4407 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
4408 next = ifp->tstamp + ifp->valid_lft * HZ;
4410 spin_unlock(&ifp->lock);
4415 ipv6_ifa_notify(0, ifp);
4419 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4420 !(ifp->flags&IFA_F_TENTATIVE)) {
4421 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4422 ifp->idev->cnf.dad_transmits *
4423 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
4425 if (age >= ifp->prefered_lft - regen_advance) {
4426 struct inet6_ifaddr *ifpub = ifp->ifpub;
4427 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4428 next = ifp->tstamp + ifp->prefered_lft * HZ;
4429 if (!ifp->regen_count && ifpub) {
4432 in6_ifa_hold(ifpub);
4433 spin_unlock(&ifp->lock);
4435 spin_lock(&ifpub->lock);
4436 ifpub->regen_count = 0;
4437 spin_unlock(&ifpub->lock);
4438 rcu_read_unlock_bh();
4439 ipv6_create_tempaddr(ifpub, ifp, true);
4445 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4446 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4447 spin_unlock(&ifp->lock);
4449 /* ifp->prefered_lft <= ifp->valid_lft */
4450 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4451 next = ifp->tstamp + ifp->prefered_lft * HZ;
4452 spin_unlock(&ifp->lock);
4457 next_sec = round_jiffies_up(next);
4460 /* If rounded timeout is accurate enough, accept it. */
4461 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4462 next_sched = next_sec;
4464 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4465 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4466 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4468 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4469 now, next, next_sec, next_sched);
4470 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
4471 rcu_read_unlock_bh();
4474 static void addrconf_verify_work(struct work_struct *w)
4477 addrconf_verify_rtnl();
4481 static void addrconf_verify(void)
4483 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4486 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4487 struct in6_addr **peer_pfx)
4489 struct in6_addr *pfx = NULL;
4494 pfx = nla_data(addr);
4497 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4499 pfx = nla_data(local);
4505 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4506 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4507 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4508 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
4509 [IFA_FLAGS] = { .len = sizeof(u32) },
4510 [IFA_RT_PRIORITY] = { .len = sizeof(u32) },
4514 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
4515 struct netlink_ext_ack *extack)
4517 struct net *net = sock_net(skb->sk);
4518 struct ifaddrmsg *ifm;
4519 struct nlattr *tb[IFA_MAX+1];
4520 struct in6_addr *pfx, *peer_pfx;
4524 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
4529 ifm = nlmsg_data(nlh);
4530 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4534 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4536 /* We ignore other flags so far. */
4537 ifa_flags &= IFA_F_MANAGETEMPADDR;
4539 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4540 ifm->ifa_prefixlen);
4543 static int modify_prefix_route(struct inet6_ifaddr *ifp,
4544 unsigned long expires, u32 flags,
4547 struct fib6_info *f6i;
4550 f6i = addrconf_get_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
4553 0, RTF_GATEWAY | RTF_DEFAULT);
4557 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF;
4558 if (f6i->fib6_metric != prio) {
4559 /* delete old one */
4560 ip6_del_rt(dev_net(ifp->idev->dev), f6i);
4563 addrconf_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
4565 ifp->rt_priority, ifp->idev->dev,
4566 expires, flags, GFP_KERNEL);
4569 fib6_clean_expires(f6i);
4571 fib6_set_expires(f6i, expires);
4573 fib6_info_release(f6i);
4579 static int inet6_addr_modify(struct inet6_ifaddr *ifp, struct ifa6_config *cfg)
4583 unsigned long timeout;
4584 bool was_managetempaddr;
4585 bool had_prefixroute;
4586 bool new_peer = false;
4590 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
4593 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR &&
4594 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4597 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED)
4598 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC;
4600 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
4601 if (addrconf_finite_timeout(timeout)) {
4602 expires = jiffies_to_clock_t(timeout * HZ);
4603 cfg->valid_lft = timeout;
4604 flags = RTF_EXPIRES;
4608 cfg->ifa_flags |= IFA_F_PERMANENT;
4611 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
4612 if (addrconf_finite_timeout(timeout)) {
4614 cfg->ifa_flags |= IFA_F_DEPRECATED;
4615 cfg->preferred_lft = timeout;
4618 if (cfg->peer_pfx &&
4619 memcmp(&ifp->peer_addr, cfg->peer_pfx, sizeof(struct in6_addr))) {
4620 if (!ipv6_addr_any(&ifp->peer_addr))
4621 cleanup_prefix_route(ifp, expires, true, true);
4625 spin_lock_bh(&ifp->lock);
4626 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4627 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4628 !(ifp->flags & IFA_F_NOPREFIXROUTE);
4629 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4630 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4631 IFA_F_NOPREFIXROUTE);
4632 ifp->flags |= cfg->ifa_flags;
4633 ifp->tstamp = jiffies;
4634 ifp->valid_lft = cfg->valid_lft;
4635 ifp->prefered_lft = cfg->preferred_lft;
4637 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority)
4638 ifp->rt_priority = cfg->rt_priority;
4641 ifp->peer_addr = *cfg->peer_pfx;
4643 spin_unlock_bh(&ifp->lock);
4644 if (!(ifp->flags&IFA_F_TENTATIVE))
4645 ipv6_ifa_notify(0, ifp);
4647 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
4650 if (had_prefixroute)
4651 rc = modify_prefix_route(ifp, expires, flags, false);
4653 /* prefix route could have been deleted; if so restore it */
4654 if (rc == -ENOENT) {
4655 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
4656 ifp->rt_priority, ifp->idev->dev,
4657 expires, flags, GFP_KERNEL);
4660 if (had_prefixroute && !ipv6_addr_any(&ifp->peer_addr))
4661 rc = modify_prefix_route(ifp, expires, flags, true);
4663 if (rc == -ENOENT && !ipv6_addr_any(&ifp->peer_addr)) {
4664 addrconf_prefix_route(&ifp->peer_addr, ifp->prefix_len,
4665 ifp->rt_priority, ifp->idev->dev,
4666 expires, flags, GFP_KERNEL);
4668 } else if (had_prefixroute) {
4669 enum cleanup_prefix_rt_t action;
4670 unsigned long rt_expires;
4672 write_lock_bh(&ifp->idev->lock);
4673 action = check_cleanup_prefix_route(ifp, &rt_expires);
4674 write_unlock_bh(&ifp->idev->lock);
4676 if (action != CLEANUP_PREFIX_RT_NOP) {
4677 cleanup_prefix_route(ifp, rt_expires,
4678 action == CLEANUP_PREFIX_RT_DEL, false);
4682 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4683 if (was_managetempaddr &&
4684 !(ifp->flags & IFA_F_MANAGETEMPADDR)) {
4686 cfg->preferred_lft = 0;
4688 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft,
4689 cfg->preferred_lft, !was_managetempaddr,
4693 addrconf_verify_rtnl();
4699 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
4700 struct netlink_ext_ack *extack)
4702 struct net *net = sock_net(skb->sk);
4703 struct ifaddrmsg *ifm;
4704 struct nlattr *tb[IFA_MAX+1];
4705 struct in6_addr *peer_pfx;
4706 struct inet6_ifaddr *ifa;
4707 struct net_device *dev;
4708 struct inet6_dev *idev;
4709 struct ifa6_config cfg;
4712 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
4717 memset(&cfg, 0, sizeof(cfg));
4719 ifm = nlmsg_data(nlh);
4720 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4724 cfg.peer_pfx = peer_pfx;
4725 cfg.plen = ifm->ifa_prefixlen;
4726 if (tb[IFA_RT_PRIORITY])
4727 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]);
4729 cfg.valid_lft = INFINITY_LIFE_TIME;
4730 cfg.preferred_lft = INFINITY_LIFE_TIME;
4732 if (tb[IFA_CACHEINFO]) {
4733 struct ifa_cacheinfo *ci;
4735 ci = nla_data(tb[IFA_CACHEINFO]);
4736 cfg.valid_lft = ci->ifa_valid;
4737 cfg.preferred_lft = ci->ifa_prefered;
4740 dev = __dev_get_by_index(net, ifm->ifa_index);
4745 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]);
4747 cfg.ifa_flags = ifm->ifa_flags;
4749 /* We ignore other flags so far. */
4750 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS |
4751 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE |
4752 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC;
4754 idev = ipv6_find_idev(dev);
4758 if (!ipv6_allow_optimistic_dad(net, idev))
4759 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC;
4761 if (cfg.ifa_flags & IFA_F_NODAD &&
4762 cfg.ifa_flags & IFA_F_OPTIMISTIC) {
4763 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive");
4767 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1);
4770 * It would be best to check for !NLM_F_CREATE here but
4771 * userspace already relies on not having to provide this.
4773 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack);
4776 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4777 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4780 err = inet6_addr_modify(ifa, &cfg);
4787 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4788 u8 scope, int ifindex)
4790 struct ifaddrmsg *ifm;
4792 ifm = nlmsg_data(nlh);
4793 ifm->ifa_family = AF_INET6;
4794 ifm->ifa_prefixlen = prefixlen;
4795 ifm->ifa_flags = flags;
4796 ifm->ifa_scope = scope;
4797 ifm->ifa_index = ifindex;
4800 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4801 unsigned long tstamp, u32 preferred, u32 valid)
4803 struct ifa_cacheinfo ci;
4805 ci.cstamp = cstamp_delta(cstamp);
4806 ci.tstamp = cstamp_delta(tstamp);
4807 ci.ifa_prefered = preferred;
4808 ci.ifa_valid = valid;
4810 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4813 static inline int rt_scope(int ifa_scope)
4815 if (ifa_scope & IFA_HOST)
4816 return RT_SCOPE_HOST;
4817 else if (ifa_scope & IFA_LINK)
4818 return RT_SCOPE_LINK;
4819 else if (ifa_scope & IFA_SITE)
4820 return RT_SCOPE_SITE;
4822 return RT_SCOPE_UNIVERSE;
4825 static inline int inet6_ifaddr_msgsize(void)
4827 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4828 + nla_total_size(16) /* IFA_LOCAL */
4829 + nla_total_size(16) /* IFA_ADDRESS */
4830 + nla_total_size(sizeof(struct ifa_cacheinfo))
4831 + nla_total_size(4) /* IFA_FLAGS */
4832 + nla_total_size(4) /* IFA_RT_PRIORITY */;
4835 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
4836 u32 portid, u32 seq, int event, unsigned int flags)
4838 struct nlmsghdr *nlh;
4839 u32 preferred, valid;
4841 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4845 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4846 ifa->idev->dev->ifindex);
4848 if (!((ifa->flags&IFA_F_PERMANENT) &&
4849 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
4850 preferred = ifa->prefered_lft;
4851 valid = ifa->valid_lft;
4852 if (preferred != INFINITY_LIFE_TIME) {
4853 long tval = (jiffies - ifa->tstamp)/HZ;
4854 if (preferred > tval)
4858 if (valid != INFINITY_LIFE_TIME) {
4866 preferred = INFINITY_LIFE_TIME;
4867 valid = INFINITY_LIFE_TIME;
4870 if (!ipv6_addr_any(&ifa->peer_addr)) {
4871 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4872 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
4875 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
4878 if (ifa->rt_priority &&
4879 nla_put_u32(skb, IFA_RT_PRIORITY, ifa->rt_priority))
4882 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4885 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4888 nlmsg_end(skb, nlh);
4892 nlmsg_cancel(skb, nlh);
4896 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
4897 u32 portid, u32 seq, int event, u16 flags)
4899 struct nlmsghdr *nlh;
4900 u8 scope = RT_SCOPE_UNIVERSE;
4901 int ifindex = ifmca->idev->dev->ifindex;
4903 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4904 scope = RT_SCOPE_SITE;
4906 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4910 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4911 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
4912 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
4913 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4914 nlmsg_cancel(skb, nlh);
4918 nlmsg_end(skb, nlh);
4922 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
4923 u32 portid, u32 seq, int event, unsigned int flags)
4925 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt);
4926 int ifindex = dev ? dev->ifindex : 1;
4927 struct nlmsghdr *nlh;
4928 u8 scope = RT_SCOPE_UNIVERSE;
4930 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4931 scope = RT_SCOPE_SITE;
4933 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4937 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4938 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
4939 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
4940 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4941 nlmsg_cancel(skb, nlh);
4945 nlmsg_end(skb, nlh);
4955 /* called with rcu_read_lock() */
4956 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4957 struct netlink_callback *cb, enum addr_type_t type,
4958 int s_ip_idx, int *p_ip_idx)
4960 struct ifmcaddr6 *ifmca;
4961 struct ifacaddr6 *ifaca;
4963 int ip_idx = *p_ip_idx;
4965 read_lock_bh(&idev->lock);
4967 case UNICAST_ADDR: {
4968 struct inet6_ifaddr *ifa;
4970 /* unicast address incl. temp addr */
4971 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4972 if (ip_idx < s_ip_idx)
4974 err = inet6_fill_ifaddr(skb, ifa,
4975 NETLINK_CB(cb->skb).portid,
4981 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4987 case MULTICAST_ADDR:
4988 /* multicast address */
4989 for (ifmca = idev->mc_list; ifmca;
4990 ifmca = ifmca->next, ip_idx++) {
4991 if (ip_idx < s_ip_idx)
4993 err = inet6_fill_ifmcaddr(skb, ifmca,
4994 NETLINK_CB(cb->skb).portid,
5003 /* anycast address */
5004 for (ifaca = idev->ac_list; ifaca;
5005 ifaca = ifaca->aca_next, ip_idx++) {
5006 if (ip_idx < s_ip_idx)
5008 err = inet6_fill_ifacaddr(skb, ifaca,
5009 NETLINK_CB(cb->skb).portid,
5020 read_unlock_bh(&idev->lock);
5025 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
5026 enum addr_type_t type)
5028 struct net *net = sock_net(skb->sk);
5031 int s_idx, s_ip_idx;
5032 struct net_device *dev;
5033 struct inet6_dev *idev;
5034 struct hlist_head *head;
5037 s_idx = idx = cb->args[1];
5038 s_ip_idx = ip_idx = cb->args[2];
5041 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
5042 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5044 head = &net->dev_index_head[h];
5045 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5048 if (h > s_h || idx > s_idx)
5051 idev = __in6_dev_get(dev);
5055 if (in6_dump_addrs(idev, skb, cb, type,
5056 s_ip_idx, &ip_idx) < 0)
5066 cb->args[2] = ip_idx;
5071 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
5073 enum addr_type_t type = UNICAST_ADDR;
5075 return inet6_dump_addr(skb, cb, type);
5078 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
5080 enum addr_type_t type = MULTICAST_ADDR;
5082 return inet6_dump_addr(skb, cb, type);
5086 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
5088 enum addr_type_t type = ANYCAST_ADDR;
5090 return inet6_dump_addr(skb, cb, type);
5093 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
5094 struct netlink_ext_ack *extack)
5096 struct net *net = sock_net(in_skb->sk);
5097 struct ifaddrmsg *ifm;
5098 struct nlattr *tb[IFA_MAX+1];
5099 struct in6_addr *addr = NULL, *peer;
5100 struct net_device *dev = NULL;
5101 struct inet6_ifaddr *ifa;
5102 struct sk_buff *skb;
5105 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
5110 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
5114 ifm = nlmsg_data(nlh);
5116 dev = dev_get_by_index(net, ifm->ifa_index);
5118 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
5120 err = -EADDRNOTAVAIL;
5124 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
5130 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
5131 nlh->nlmsg_seq, RTM_NEWADDR, 0);
5133 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5134 WARN_ON(err == -EMSGSIZE);
5138 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
5147 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
5149 struct sk_buff *skb;
5150 struct net *net = dev_net(ifa->idev->dev);
5153 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5157 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
5159 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5160 WARN_ON(err == -EMSGSIZE);
5164 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
5168 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
5171 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
5172 __s32 *array, int bytes)
5174 BUG_ON(bytes < (DEVCONF_MAX * 4));
5176 memset(array, 0, bytes);
5177 array[DEVCONF_FORWARDING] = cnf->forwarding;
5178 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
5179 array[DEVCONF_MTU6] = cnf->mtu6;
5180 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
5181 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
5182 array[DEVCONF_AUTOCONF] = cnf->autoconf;
5183 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
5184 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
5185 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
5186 jiffies_to_msecs(cnf->rtr_solicit_interval);
5187 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
5188 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
5189 array[DEVCONF_RTR_SOLICIT_DELAY] =
5190 jiffies_to_msecs(cnf->rtr_solicit_delay);
5191 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
5192 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
5193 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
5194 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
5195 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
5196 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
5197 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
5198 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
5199 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
5200 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
5201 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
5202 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
5203 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
5204 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
5205 #ifdef CONFIG_IPV6_ROUTER_PREF
5206 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
5207 array[DEVCONF_RTR_PROBE_INTERVAL] =
5208 jiffies_to_msecs(cnf->rtr_probe_interval);
5209 #ifdef CONFIG_IPV6_ROUTE_INFO
5210 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen;
5211 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
5214 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
5215 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
5216 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5217 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
5218 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
5220 #ifdef CONFIG_IPV6_MROUTE
5221 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
5223 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
5224 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
5225 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5226 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
5227 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
5228 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
5229 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
5230 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
5231 /* we omit DEVCONF_STABLE_SECRET for now */
5232 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
5233 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
5234 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
5235 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
5236 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled;
5237 #ifdef CONFIG_IPV6_SEG6_HMAC
5238 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac;
5240 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad;
5241 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode;
5242 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy;
5243 array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass;
5246 static inline size_t inet6_ifla6_size(void)
5248 return nla_total_size(4) /* IFLA_INET6_FLAGS */
5249 + nla_total_size(sizeof(struct ifla_cacheinfo))
5250 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5251 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
5252 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
5253 + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */
5254 + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */
5258 static inline size_t inet6_if_nlmsg_size(void)
5260 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5261 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5262 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5263 + nla_total_size(4) /* IFLA_MTU */
5264 + nla_total_size(4) /* IFLA_LINK */
5265 + nla_total_size(1) /* IFLA_OPERSTATE */
5266 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
5269 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
5273 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
5276 /* Use put_unaligned() because stats may not be aligned for u64. */
5277 put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5278 for (i = 1; i < ICMP6_MIB_MAX; i++)
5279 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
5281 memset(&stats[ICMP6_MIB_MAX], 0, pad);
5284 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
5285 int bytes, size_t syncpoff)
5288 u64 buff[IPSTATS_MIB_MAX];
5289 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5293 memset(buff, 0, sizeof(buff));
5294 buff[0] = IPSTATS_MIB_MAX;
5296 for_each_possible_cpu(c) {
5297 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5298 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5301 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5302 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
5305 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5309 case IFLA_INET6_STATS:
5310 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5311 offsetof(struct ipstats_mib, syncp));
5313 case IFLA_INET6_ICMP6STATS:
5314 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
5319 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5320 u32 ext_filter_mask)
5323 struct ifla_cacheinfo ci;
5325 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5326 goto nla_put_failure;
5327 ci.max_reasm_len = IPV6_MAXPLEN;
5328 ci.tstamp = cstamp_delta(idev->tstamp);
5329 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
5330 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
5331 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5332 goto nla_put_failure;
5333 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
5335 goto nla_put_failure;
5336 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5338 /* XXX - MC not implemented */
5340 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5343 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
5345 goto nla_put_failure;
5346 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5348 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
5350 goto nla_put_failure;
5351 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5353 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
5355 goto nla_put_failure;
5357 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode))
5358 goto nla_put_failure;
5360 read_lock_bh(&idev->lock);
5361 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5362 read_unlock_bh(&idev->lock);
5370 static size_t inet6_get_link_af_size(const struct net_device *dev,
5371 u32 ext_filter_mask)
5373 if (!__in6_dev_get(dev))
5376 return inet6_ifla6_size();
5379 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5380 u32 ext_filter_mask)
5382 struct inet6_dev *idev = __in6_dev_get(dev);
5387 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
5393 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
5395 struct inet6_ifaddr *ifp;
5396 struct net_device *dev = idev->dev;
5397 bool clear_token, update_rs = false;
5398 struct in6_addr ll_addr;
5404 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5406 if (!ipv6_accept_ra(idev))
5408 if (idev->cnf.rtr_solicits == 0)
5411 write_lock_bh(&idev->lock);
5413 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5414 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5416 write_unlock_bh(&idev->lock);
5418 clear_token = ipv6_addr_any(token);
5422 if (!idev->dead && (idev->if_flags & IF_READY) &&
5423 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5424 IFA_F_OPTIMISTIC)) {
5425 /* If we're not ready, then normal ifup will take care
5426 * of this. Otherwise, we need to request our rs here.
5428 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5433 write_lock_bh(&idev->lock);
5436 idev->if_flags |= IF_RS_SENT;
5437 idev->rs_interval = rfc3315_s14_backoff_init(
5438 idev->cnf.rtr_solicit_interval);
5439 idev->rs_probes = 1;
5440 addrconf_mod_rs_timer(idev, idev->rs_interval);
5443 /* Well, that's kinda nasty ... */
5444 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5445 spin_lock(&ifp->lock);
5446 if (ifp->tokenized) {
5448 ifp->prefered_lft = 0;
5450 spin_unlock(&ifp->lock);
5453 write_unlock_bh(&idev->lock);
5454 inet6_ifinfo_notify(RTM_NEWLINK, idev);
5455 addrconf_verify_rtnl();
5459 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5460 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5461 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5464 static int inet6_validate_link_af(const struct net_device *dev,
5465 const struct nlattr *nla)
5467 struct nlattr *tb[IFLA_INET6_MAX + 1];
5469 if (dev && !__in6_dev_get(dev))
5470 return -EAFNOSUPPORT;
5472 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy,
5476 static int check_addr_gen_mode(int mode)
5478 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5479 mode != IN6_ADDR_GEN_MODE_NONE &&
5480 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5481 mode != IN6_ADDR_GEN_MODE_RANDOM)
5486 static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5489 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5490 !idev->cnf.stable_secret.initialized &&
5491 !net->ipv6.devconf_dflt->stable_secret.initialized)
5496 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5499 struct inet6_dev *idev = __in6_dev_get(dev);
5500 struct nlattr *tb[IFLA_INET6_MAX + 1];
5503 return -EAFNOSUPPORT;
5505 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0)
5508 if (tb[IFLA_INET6_TOKEN]) {
5509 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
5514 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5515 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5517 if (check_addr_gen_mode(mode) < 0 ||
5518 check_stable_privacy(idev, dev_net(dev), mode) < 0)
5521 idev->cnf.addr_gen_mode = mode;
5528 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
5529 u32 portid, u32 seq, int event, unsigned int flags)
5531 struct net_device *dev = idev->dev;
5532 struct ifinfomsg *hdr;
5533 struct nlmsghdr *nlh;
5536 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
5540 hdr = nlmsg_data(nlh);
5541 hdr->ifi_family = AF_INET6;
5543 hdr->ifi_type = dev->type;
5544 hdr->ifi_index = dev->ifindex;
5545 hdr->ifi_flags = dev_get_flags(dev);
5546 hdr->ifi_change = 0;
5548 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5550 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5551 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
5552 (dev->ifindex != dev_get_iflink(dev) &&
5553 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5554 nla_put_u8(skb, IFLA_OPERSTATE,
5555 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
5556 goto nla_put_failure;
5557 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
5559 goto nla_put_failure;
5561 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
5562 goto nla_put_failure;
5564 nla_nest_end(skb, protoinfo);
5565 nlmsg_end(skb, nlh);
5569 nlmsg_cancel(skb, nlh);
5573 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5575 struct net *net = sock_net(skb->sk);
5578 struct net_device *dev;
5579 struct inet6_dev *idev;
5580 struct hlist_head *head;
5583 s_idx = cb->args[1];
5586 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5588 head = &net->dev_index_head[h];
5589 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5592 idev = __in6_dev_get(dev);
5595 if (inet6_fill_ifinfo(skb, idev,
5596 NETLINK_CB(cb->skb).portid,
5598 RTM_NEWLINK, NLM_F_MULTI) < 0)
5612 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5614 struct sk_buff *skb;
5615 struct net *net = dev_net(idev->dev);
5618 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
5622 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
5624 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5625 WARN_ON(err == -EMSGSIZE);
5629 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
5633 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
5636 static inline size_t inet6_prefix_nlmsg_size(void)
5638 return NLMSG_ALIGN(sizeof(struct prefixmsg))
5639 + nla_total_size(sizeof(struct in6_addr))
5640 + nla_total_size(sizeof(struct prefix_cacheinfo));
5643 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
5644 struct prefix_info *pinfo, u32 portid, u32 seq,
5645 int event, unsigned int flags)
5647 struct prefixmsg *pmsg;
5648 struct nlmsghdr *nlh;
5649 struct prefix_cacheinfo ci;
5651 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
5655 pmsg = nlmsg_data(nlh);
5656 pmsg->prefix_family = AF_INET6;
5657 pmsg->prefix_pad1 = 0;
5658 pmsg->prefix_pad2 = 0;
5659 pmsg->prefix_ifindex = idev->dev->ifindex;
5660 pmsg->prefix_len = pinfo->prefix_len;
5661 pmsg->prefix_type = pinfo->type;
5662 pmsg->prefix_pad3 = 0;
5663 pmsg->prefix_flags = 0;
5665 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5666 if (pinfo->autoconf)
5667 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5669 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5670 goto nla_put_failure;
5671 ci.preferred_time = ntohl(pinfo->prefered);
5672 ci.valid_time = ntohl(pinfo->valid);
5673 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5674 goto nla_put_failure;
5675 nlmsg_end(skb, nlh);
5679 nlmsg_cancel(skb, nlh);
5683 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
5684 struct prefix_info *pinfo)
5686 struct sk_buff *skb;
5687 struct net *net = dev_net(idev->dev);
5690 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
5694 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
5696 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5697 WARN_ON(err == -EMSGSIZE);
5701 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5705 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
5708 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5710 struct net *net = dev_net(ifp->idev->dev);
5715 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5720 * If the address was optimistic we inserted the route at the
5721 * start of our DAD process, so we don't need to do it again.
5722 * If the device was taken down in the middle of the DAD
5723 * cycle there is a race where we could get here without a
5724 * host route, so nothing to insert. That will be fixed when
5725 * the device is brought up.
5727 if (ifp->rt && !rcu_access_pointer(ifp->rt->fib6_node)) {
5728 ip6_ins_rt(net, ifp->rt);
5729 } else if (!ifp->rt && (ifp->idev->dev->flags & IFF_UP)) {
5730 pr_warn("BUG: Address %pI6c on device %s is missing its host route.\n",
5731 &ifp->addr, ifp->idev->dev->name);
5734 if (ifp->idev->cnf.forwarding)
5735 addrconf_join_anycast(ifp);
5736 if (!ipv6_addr_any(&ifp->peer_addr))
5737 addrconf_prefix_route(&ifp->peer_addr, 128,
5738 ifp->rt_priority, ifp->idev->dev,
5742 if (ifp->idev->cnf.forwarding)
5743 addrconf_leave_anycast(ifp);
5744 addrconf_leave_solict(ifp->idev, &ifp->addr);
5745 if (!ipv6_addr_any(&ifp->peer_addr)) {
5746 struct fib6_info *rt;
5748 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5749 ifp->idev->dev, 0, 0);
5751 ip6_del_rt(net, rt);
5754 ip6_del_rt(net, ifp->rt);
5757 rt_genid_bump_ipv6(net);
5760 atomic_inc(&net->ipv6.dev_addr_genid);
5763 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5766 if (likely(ifp->idev->dead == 0))
5767 __ipv6_ifa_notify(event, ifp);
5768 rcu_read_unlock_bh();
5771 #ifdef CONFIG_SYSCTL
5774 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
5775 void __user *buffer, size_t *lenp, loff_t *ppos)
5777 int *valp = ctl->data;
5780 struct ctl_table lctl;
5784 * ctl->data points to idev->cnf.forwarding, we should
5785 * not modify it until we get the rtnl lock.
5790 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5793 ret = addrconf_fixup_forwarding(ctl, valp, val);
5800 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5801 void __user *buffer, size_t *lenp, loff_t *ppos)
5803 struct inet6_dev *idev = ctl->extra1;
5804 int min_mtu = IPV6_MIN_MTU;
5805 struct ctl_table lctl;
5808 lctl.extra1 = &min_mtu;
5809 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5811 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5814 static void dev_disable_change(struct inet6_dev *idev)
5816 struct netdev_notifier_info info;
5818 if (!idev || !idev->dev)
5821 netdev_notifier_info_init(&info, idev->dev);
5822 if (idev->cnf.disable_ipv6)
5823 addrconf_notify(NULL, NETDEV_DOWN, &info);
5825 addrconf_notify(NULL, NETDEV_UP, &info);
5828 static void addrconf_disable_change(struct net *net, __s32 newf)
5830 struct net_device *dev;
5831 struct inet6_dev *idev;
5833 for_each_netdev(net, dev) {
5834 idev = __in6_dev_get(dev);
5836 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5837 idev->cnf.disable_ipv6 = newf;
5839 dev_disable_change(idev);
5844 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
5849 if (!rtnl_trylock())
5850 return restart_syscall();
5852 net = (struct net *)table->extra2;
5856 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5861 if (p == &net->ipv6.devconf_all->disable_ipv6) {
5862 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5863 addrconf_disable_change(net, newf);
5864 } else if ((!newf) ^ (!old))
5865 dev_disable_change((struct inet6_dev *)table->extra1);
5872 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
5873 void __user *buffer, size_t *lenp, loff_t *ppos)
5875 int *valp = ctl->data;
5878 struct ctl_table lctl;
5882 * ctl->data points to idev->cnf.disable_ipv6, we should
5883 * not modify it until we get the rtnl lock.
5888 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5891 ret = addrconf_disable_ipv6(ctl, valp, val);
5898 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5899 void __user *buffer, size_t *lenp, loff_t *ppos)
5901 int *valp = ctl->data;
5906 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5909 if (write && old != new) {
5910 struct net *net = ctl->extra2;
5912 if (!rtnl_trylock())
5913 return restart_syscall();
5915 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5916 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5917 NETCONFA_PROXY_NEIGH,
5918 NETCONFA_IFINDEX_DEFAULT,
5919 net->ipv6.devconf_dflt);
5920 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5921 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5922 NETCONFA_PROXY_NEIGH,
5923 NETCONFA_IFINDEX_ALL,
5924 net->ipv6.devconf_all);
5926 struct inet6_dev *idev = ctl->extra1;
5928 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5929 NETCONFA_PROXY_NEIGH,
5939 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
5940 void __user *buffer, size_t *lenp,
5945 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
5946 struct net *net = (struct net *)ctl->extra2;
5947 struct ctl_table tmp = {
5949 .maxlen = sizeof(new_val),
5953 if (!rtnl_trylock())
5954 return restart_syscall();
5956 new_val = *((u32 *)ctl->data);
5958 ret = proc_douintvec(&tmp, write, buffer, lenp, ppos);
5963 if (check_addr_gen_mode(new_val) < 0) {
5969 if (check_stable_privacy(idev, net, new_val) < 0) {
5974 if (idev->cnf.addr_gen_mode != new_val) {
5975 idev->cnf.addr_gen_mode = new_val;
5976 addrconf_dev_config(idev->dev);
5978 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) {
5979 struct net_device *dev;
5981 net->ipv6.devconf_dflt->addr_gen_mode = new_val;
5982 for_each_netdev(net, dev) {
5983 idev = __in6_dev_get(dev);
5985 idev->cnf.addr_gen_mode != new_val) {
5986 idev->cnf.addr_gen_mode = new_val;
5987 addrconf_dev_config(idev->dev);
5992 *((u32 *)ctl->data) = new_val;
6001 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
6002 void __user *buffer, size_t *lenp,
6006 struct in6_addr addr;
6007 char str[IPV6_MAX_STRLEN];
6008 struct ctl_table lctl = *ctl;
6009 struct net *net = ctl->extra2;
6010 struct ipv6_stable_secret *secret = ctl->data;
6012 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
6015 lctl.maxlen = IPV6_MAX_STRLEN;
6018 if (!rtnl_trylock())
6019 return restart_syscall();
6021 if (!write && !secret->initialized) {
6026 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
6027 if (err >= sizeof(str)) {
6032 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
6036 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
6041 secret->initialized = true;
6042 secret->secret = addr;
6044 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
6045 struct net_device *dev;
6047 for_each_netdev(net, dev) {
6048 struct inet6_dev *idev = __in6_dev_get(dev);
6051 idev->cnf.addr_gen_mode =
6052 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
6056 struct inet6_dev *idev = ctl->extra1;
6058 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
6068 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
6070 void __user *buffer,
6074 int *valp = ctl->data;
6077 struct ctl_table lctl;
6080 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
6081 * we should not modify it until we get the rtnl lock.
6086 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6089 ret = addrconf_fixup_linkdown(ctl, valp, val);
6096 void addrconf_set_nopolicy(struct rt6_info *rt, int action)
6100 rt->dst.flags |= DST_NOPOLICY;
6102 rt->dst.flags &= ~DST_NOPOLICY;
6107 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
6109 struct inet6_ifaddr *ifa;
6111 read_lock_bh(&idev->lock);
6112 list_for_each_entry(ifa, &idev->addr_list, if_list) {
6113 spin_lock(&ifa->lock);
6115 struct fib6_info *rt = ifa->rt;
6119 ifa->rt->dst_nopolicy = val ? true : false;
6120 if (rt->rt6i_pcpu) {
6121 for_each_possible_cpu(cpu) {
6122 struct rt6_info **rtp;
6124 rtp = per_cpu_ptr(rt->rt6i_pcpu, cpu);
6125 addrconf_set_nopolicy(*rtp, val);
6130 spin_unlock(&ifa->lock);
6132 read_unlock_bh(&idev->lock);
6136 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val)
6138 struct inet6_dev *idev;
6141 if (!rtnl_trylock())
6142 return restart_syscall();
6146 net = (struct net *)ctl->extra2;
6147 if (valp == &net->ipv6.devconf_dflt->disable_policy) {
6152 if (valp == &net->ipv6.devconf_all->disable_policy) {
6153 struct net_device *dev;
6155 for_each_netdev(net, dev) {
6156 idev = __in6_dev_get(dev);
6158 addrconf_disable_policy_idev(idev, val);
6161 idev = (struct inet6_dev *)ctl->extra1;
6162 addrconf_disable_policy_idev(idev, val);
6170 int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write,
6171 void __user *buffer, size_t *lenp,
6174 int *valp = ctl->data;
6177 struct ctl_table lctl;
6182 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6184 if (write && (*valp != val))
6185 ret = addrconf_disable_policy(ctl, valp, val);
6193 static int minus_one = -1;
6194 static const int zero = 0;
6195 static const int one = 1;
6196 static const int two_five_five = 255;
6198 static const struct ctl_table addrconf_sysctl[] = {
6200 .procname = "forwarding",
6201 .data = &ipv6_devconf.forwarding,
6202 .maxlen = sizeof(int),
6204 .proc_handler = addrconf_sysctl_forward,
6207 .procname = "hop_limit",
6208 .data = &ipv6_devconf.hop_limit,
6209 .maxlen = sizeof(int),
6211 .proc_handler = proc_dointvec_minmax,
6212 .extra1 = (void *)&one,
6213 .extra2 = (void *)&two_five_five,
6217 .data = &ipv6_devconf.mtu6,
6218 .maxlen = sizeof(int),
6220 .proc_handler = addrconf_sysctl_mtu,
6223 .procname = "accept_ra",
6224 .data = &ipv6_devconf.accept_ra,
6225 .maxlen = sizeof(int),
6227 .proc_handler = proc_dointvec,
6230 .procname = "accept_redirects",
6231 .data = &ipv6_devconf.accept_redirects,
6232 .maxlen = sizeof(int),
6234 .proc_handler = proc_dointvec,
6237 .procname = "autoconf",
6238 .data = &ipv6_devconf.autoconf,
6239 .maxlen = sizeof(int),
6241 .proc_handler = proc_dointvec,
6244 .procname = "dad_transmits",
6245 .data = &ipv6_devconf.dad_transmits,
6246 .maxlen = sizeof(int),
6248 .proc_handler = proc_dointvec,
6251 .procname = "router_solicitations",
6252 .data = &ipv6_devconf.rtr_solicits,
6253 .maxlen = sizeof(int),
6255 .proc_handler = proc_dointvec_minmax,
6256 .extra1 = &minus_one,
6259 .procname = "router_solicitation_interval",
6260 .data = &ipv6_devconf.rtr_solicit_interval,
6261 .maxlen = sizeof(int),
6263 .proc_handler = proc_dointvec_jiffies,
6266 .procname = "router_solicitation_max_interval",
6267 .data = &ipv6_devconf.rtr_solicit_max_interval,
6268 .maxlen = sizeof(int),
6270 .proc_handler = proc_dointvec_jiffies,
6273 .procname = "router_solicitation_delay",
6274 .data = &ipv6_devconf.rtr_solicit_delay,
6275 .maxlen = sizeof(int),
6277 .proc_handler = proc_dointvec_jiffies,
6280 .procname = "force_mld_version",
6281 .data = &ipv6_devconf.force_mld_version,
6282 .maxlen = sizeof(int),
6284 .proc_handler = proc_dointvec,
6287 .procname = "mldv1_unsolicited_report_interval",
6289 &ipv6_devconf.mldv1_unsolicited_report_interval,
6290 .maxlen = sizeof(int),
6292 .proc_handler = proc_dointvec_ms_jiffies,
6295 .procname = "mldv2_unsolicited_report_interval",
6297 &ipv6_devconf.mldv2_unsolicited_report_interval,
6298 .maxlen = sizeof(int),
6300 .proc_handler = proc_dointvec_ms_jiffies,
6303 .procname = "use_tempaddr",
6304 .data = &ipv6_devconf.use_tempaddr,
6305 .maxlen = sizeof(int),
6307 .proc_handler = proc_dointvec,
6310 .procname = "temp_valid_lft",
6311 .data = &ipv6_devconf.temp_valid_lft,
6312 .maxlen = sizeof(int),
6314 .proc_handler = proc_dointvec,
6317 .procname = "temp_prefered_lft",
6318 .data = &ipv6_devconf.temp_prefered_lft,
6319 .maxlen = sizeof(int),
6321 .proc_handler = proc_dointvec,
6324 .procname = "regen_max_retry",
6325 .data = &ipv6_devconf.regen_max_retry,
6326 .maxlen = sizeof(int),
6328 .proc_handler = proc_dointvec,
6331 .procname = "max_desync_factor",
6332 .data = &ipv6_devconf.max_desync_factor,
6333 .maxlen = sizeof(int),
6335 .proc_handler = proc_dointvec,
6338 .procname = "max_addresses",
6339 .data = &ipv6_devconf.max_addresses,
6340 .maxlen = sizeof(int),
6342 .proc_handler = proc_dointvec,
6345 .procname = "accept_ra_defrtr",
6346 .data = &ipv6_devconf.accept_ra_defrtr,
6347 .maxlen = sizeof(int),
6349 .proc_handler = proc_dointvec,
6352 .procname = "accept_ra_min_hop_limit",
6353 .data = &ipv6_devconf.accept_ra_min_hop_limit,
6354 .maxlen = sizeof(int),
6356 .proc_handler = proc_dointvec,
6359 .procname = "accept_ra_pinfo",
6360 .data = &ipv6_devconf.accept_ra_pinfo,
6361 .maxlen = sizeof(int),
6363 .proc_handler = proc_dointvec,
6365 #ifdef CONFIG_IPV6_ROUTER_PREF
6367 .procname = "accept_ra_rtr_pref",
6368 .data = &ipv6_devconf.accept_ra_rtr_pref,
6369 .maxlen = sizeof(int),
6371 .proc_handler = proc_dointvec,
6374 .procname = "router_probe_interval",
6375 .data = &ipv6_devconf.rtr_probe_interval,
6376 .maxlen = sizeof(int),
6378 .proc_handler = proc_dointvec_jiffies,
6380 #ifdef CONFIG_IPV6_ROUTE_INFO
6382 .procname = "accept_ra_rt_info_min_plen",
6383 .data = &ipv6_devconf.accept_ra_rt_info_min_plen,
6384 .maxlen = sizeof(int),
6386 .proc_handler = proc_dointvec,
6389 .procname = "accept_ra_rt_info_max_plen",
6390 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
6391 .maxlen = sizeof(int),
6393 .proc_handler = proc_dointvec,
6398 .procname = "proxy_ndp",
6399 .data = &ipv6_devconf.proxy_ndp,
6400 .maxlen = sizeof(int),
6402 .proc_handler = addrconf_sysctl_proxy_ndp,
6405 .procname = "accept_source_route",
6406 .data = &ipv6_devconf.accept_source_route,
6407 .maxlen = sizeof(int),
6409 .proc_handler = proc_dointvec,
6411 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
6413 .procname = "optimistic_dad",
6414 .data = &ipv6_devconf.optimistic_dad,
6415 .maxlen = sizeof(int),
6417 .proc_handler = proc_dointvec,
6420 .procname = "use_optimistic",
6421 .data = &ipv6_devconf.use_optimistic,
6422 .maxlen = sizeof(int),
6424 .proc_handler = proc_dointvec,
6427 #ifdef CONFIG_IPV6_MROUTE
6429 .procname = "mc_forwarding",
6430 .data = &ipv6_devconf.mc_forwarding,
6431 .maxlen = sizeof(int),
6433 .proc_handler = proc_dointvec,
6437 .procname = "disable_ipv6",
6438 .data = &ipv6_devconf.disable_ipv6,
6439 .maxlen = sizeof(int),
6441 .proc_handler = addrconf_sysctl_disable,
6444 .procname = "accept_dad",
6445 .data = &ipv6_devconf.accept_dad,
6446 .maxlen = sizeof(int),
6448 .proc_handler = proc_dointvec,
6451 .procname = "force_tllao",
6452 .data = &ipv6_devconf.force_tllao,
6453 .maxlen = sizeof(int),
6455 .proc_handler = proc_dointvec
6458 .procname = "ndisc_notify",
6459 .data = &ipv6_devconf.ndisc_notify,
6460 .maxlen = sizeof(int),
6462 .proc_handler = proc_dointvec
6465 .procname = "suppress_frag_ndisc",
6466 .data = &ipv6_devconf.suppress_frag_ndisc,
6467 .maxlen = sizeof(int),
6469 .proc_handler = proc_dointvec
6472 .procname = "accept_ra_from_local",
6473 .data = &ipv6_devconf.accept_ra_from_local,
6474 .maxlen = sizeof(int),
6476 .proc_handler = proc_dointvec,
6479 .procname = "accept_ra_mtu",
6480 .data = &ipv6_devconf.accept_ra_mtu,
6481 .maxlen = sizeof(int),
6483 .proc_handler = proc_dointvec,
6486 .procname = "stable_secret",
6487 .data = &ipv6_devconf.stable_secret,
6488 .maxlen = IPV6_MAX_STRLEN,
6490 .proc_handler = addrconf_sysctl_stable_secret,
6493 .procname = "use_oif_addrs_only",
6494 .data = &ipv6_devconf.use_oif_addrs_only,
6495 .maxlen = sizeof(int),
6497 .proc_handler = proc_dointvec,
6500 .procname = "ignore_routes_with_linkdown",
6501 .data = &ipv6_devconf.ignore_routes_with_linkdown,
6502 .maxlen = sizeof(int),
6504 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
6507 .procname = "drop_unicast_in_l2_multicast",
6508 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
6509 .maxlen = sizeof(int),
6511 .proc_handler = proc_dointvec,
6514 .procname = "drop_unsolicited_na",
6515 .data = &ipv6_devconf.drop_unsolicited_na,
6516 .maxlen = sizeof(int),
6518 .proc_handler = proc_dointvec,
6521 .procname = "keep_addr_on_down",
6522 .data = &ipv6_devconf.keep_addr_on_down,
6523 .maxlen = sizeof(int),
6525 .proc_handler = proc_dointvec,
6529 .procname = "seg6_enabled",
6530 .data = &ipv6_devconf.seg6_enabled,
6531 .maxlen = sizeof(int),
6533 .proc_handler = proc_dointvec,
6535 #ifdef CONFIG_IPV6_SEG6_HMAC
6537 .procname = "seg6_require_hmac",
6538 .data = &ipv6_devconf.seg6_require_hmac,
6539 .maxlen = sizeof(int),
6541 .proc_handler = proc_dointvec,
6545 .procname = "enhanced_dad",
6546 .data = &ipv6_devconf.enhanced_dad,
6547 .maxlen = sizeof(int),
6549 .proc_handler = proc_dointvec,
6552 .procname = "addr_gen_mode",
6553 .data = &ipv6_devconf.addr_gen_mode,
6554 .maxlen = sizeof(int),
6556 .proc_handler = addrconf_sysctl_addr_gen_mode,
6559 .procname = "disable_policy",
6560 .data = &ipv6_devconf.disable_policy,
6561 .maxlen = sizeof(int),
6563 .proc_handler = addrconf_sysctl_disable_policy,
6566 .procname = "ndisc_tclass",
6567 .data = &ipv6_devconf.ndisc_tclass,
6568 .maxlen = sizeof(int),
6570 .proc_handler = proc_dointvec_minmax,
6571 .extra1 = (void *)&zero,
6572 .extra2 = (void *)&two_five_five,
6579 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
6580 struct inet6_dev *idev, struct ipv6_devconf *p)
6583 struct ctl_table *table;
6584 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
6586 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
6590 for (i = 0; table[i].data; i++) {
6591 table[i].data += (char *)p - (char *)&ipv6_devconf;
6592 /* If one of these is already set, then it is not safe to
6593 * overwrite either of them: this makes proc_dointvec_minmax
6596 if (!table[i].extra1 && !table[i].extra2) {
6597 table[i].extra1 = idev; /* embedded; no ref */
6598 table[i].extra2 = net;
6602 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
6604 p->sysctl_header = register_net_sysctl(net, path, table);
6605 if (!p->sysctl_header)
6608 if (!strcmp(dev_name, "all"))
6609 ifindex = NETCONFA_IFINDEX_ALL;
6610 else if (!strcmp(dev_name, "default"))
6611 ifindex = NETCONFA_IFINDEX_DEFAULT;
6613 ifindex = idev->dev->ifindex;
6614 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
6624 static void __addrconf_sysctl_unregister(struct net *net,
6625 struct ipv6_devconf *p, int ifindex)
6627 struct ctl_table *table;
6629 if (!p->sysctl_header)
6632 table = p->sysctl_header->ctl_table_arg;
6633 unregister_net_sysctl_table(p->sysctl_header);
6634 p->sysctl_header = NULL;
6637 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
6640 static int addrconf_sysctl_register(struct inet6_dev *idev)
6644 if (!sysctl_dev_name_is_allowed(idev->dev->name))
6647 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
6648 &ndisc_ifinfo_sysctl_change);
6651 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
6654 neigh_sysctl_unregister(idev->nd_parms);
6659 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
6661 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf,
6662 idev->dev->ifindex);
6663 neigh_sysctl_unregister(idev->nd_parms);
6669 static int __net_init addrconf_init_net(struct net *net)
6672 struct ipv6_devconf *all, *dflt;
6674 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
6678 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
6680 goto err_alloc_dflt;
6682 /* these will be inherited by all namespaces */
6683 dflt->autoconf = ipv6_defaults.autoconf;
6684 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
6686 dflt->stable_secret.initialized = false;
6687 all->stable_secret.initialized = false;
6689 net->ipv6.devconf_all = all;
6690 net->ipv6.devconf_dflt = dflt;
6692 #ifdef CONFIG_SYSCTL
6693 err = __addrconf_sysctl_register(net, "all", NULL, all);
6697 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
6703 #ifdef CONFIG_SYSCTL
6705 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
6715 static void __net_exit addrconf_exit_net(struct net *net)
6717 #ifdef CONFIG_SYSCTL
6718 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt,
6719 NETCONFA_IFINDEX_DEFAULT);
6720 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all,
6721 NETCONFA_IFINDEX_ALL);
6723 kfree(net->ipv6.devconf_dflt);
6724 kfree(net->ipv6.devconf_all);
6727 static struct pernet_operations addrconf_ops = {
6728 .init = addrconf_init_net,
6729 .exit = addrconf_exit_net,
6732 static struct rtnl_af_ops inet6_ops __read_mostly = {
6734 .fill_link_af = inet6_fill_link_af,
6735 .get_link_af_size = inet6_get_link_af_size,
6736 .validate_link_af = inet6_validate_link_af,
6737 .set_link_af = inet6_set_link_af,
6741 * Init / cleanup code
6744 int __init addrconf_init(void)
6746 struct inet6_dev *idev;
6749 err = ipv6_addr_label_init();
6751 pr_crit("%s: cannot initialize default policy table: %d\n",
6756 err = register_pernet_subsys(&addrconf_ops);
6760 addrconf_wq = create_workqueue("ipv6_addrconf");
6766 /* The addrconf netdev notifier requires that loopback_dev
6767 * has it's ipv6 private information allocated and setup
6768 * before it can bring up and give link-local addresses
6769 * to other devices which are up.
6771 * Unfortunately, loopback_dev is not necessarily the first
6772 * entry in the global dev_base list of net devices. In fact,
6773 * it is likely to be the very last entry on that list.
6774 * So this causes the notifier registry below to try and
6775 * give link-local addresses to all devices besides loopback_dev
6776 * first, then loopback_dev, which cases all the non-loopback_dev
6777 * devices to fail to get a link-local address.
6779 * So, as a temporary fix, allocate the ipv6 structure for
6780 * loopback_dev first by hand.
6781 * Longer term, all of the dependencies ipv6 has upon the loopback
6782 * device and it being up should be removed.
6785 idev = ipv6_add_dev(init_net.loopback_dev);
6788 err = PTR_ERR(idev);
6792 ip6_route_init_special_entries();
6794 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6795 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
6797 register_netdevice_notifier(&ipv6_dev_notf);
6801 rtnl_af_register(&inet6_ops);
6803 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK,
6804 NULL, inet6_dump_ifinfo, 0);
6808 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR,
6809 inet6_rtm_newaddr, NULL, 0);
6812 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR,
6813 inet6_rtm_deladdr, NULL, 0);
6816 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR,
6817 inet6_rtm_getaddr, inet6_dump_ifaddr,
6818 RTNL_FLAG_DOIT_UNLOCKED);
6821 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST,
6822 NULL, inet6_dump_ifmcaddr, 0);
6825 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST,
6826 NULL, inet6_dump_ifacaddr, 0);
6829 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF,
6830 inet6_netconf_get_devconf,
6831 inet6_netconf_dump_devconf,
6832 RTNL_FLAG_DOIT_UNLOCKED);
6835 err = ipv6_addr_label_rtnl_register();
6841 rtnl_unregister_all(PF_INET6);
6842 rtnl_af_unregister(&inet6_ops);
6843 unregister_netdevice_notifier(&ipv6_dev_notf);
6845 destroy_workqueue(addrconf_wq);
6847 unregister_pernet_subsys(&addrconf_ops);
6849 ipv6_addr_label_cleanup();
6854 void addrconf_cleanup(void)
6856 struct net_device *dev;
6859 unregister_netdevice_notifier(&ipv6_dev_notf);
6860 unregister_pernet_subsys(&addrconf_ops);
6861 ipv6_addr_label_cleanup();
6863 rtnl_af_unregister(&inet6_ops);
6867 /* clean dev list */
6868 for_each_netdev(&init_net, dev) {
6869 if (__in6_dev_get(dev) == NULL)
6871 addrconf_ifdown(dev, 1);
6873 addrconf_ifdown(init_net.loopback_dev, 2);
6878 spin_lock_bh(&addrconf_hash_lock);
6879 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6880 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
6881 spin_unlock_bh(&addrconf_hash_lock);
6882 cancel_delayed_work(&addr_chk_work);
6885 destroy_workqueue(addrconf_wq);