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 rt6_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);
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.addr_gen_mode = ipv6_devconf_dflt.addr_gen_mode;
391 ndev->cnf.mtu6 = dev->mtu;
392 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
393 if (!ndev->nd_parms) {
397 if (ndev->cnf.forwarding)
398 dev_disable_lro(dev);
399 /* We refer to the device */
402 if (snmp6_alloc_dev(ndev) < 0) {
403 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n",
405 neigh_parms_release(&nd_tbl, ndev->nd_parms);
411 if (snmp6_register_dev(ndev) < 0) {
412 netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n",
413 __func__, dev->name);
417 /* One reference from device. */
418 refcount_set(&ndev->refcnt, 1);
420 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
421 ndev->cnf.accept_dad = -1;
423 #if IS_ENABLED(CONFIG_IPV6_SIT)
424 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
425 pr_info("%s: Disabled Multicast RS\n", dev->name);
426 ndev->cnf.rtr_solicits = 0;
430 INIT_LIST_HEAD(&ndev->tempaddr_list);
431 ndev->desync_factor = U32_MAX;
432 if ((dev->flags&IFF_LOOPBACK) ||
433 dev->type == ARPHRD_TUNNEL ||
434 dev->type == ARPHRD_TUNNEL6 ||
435 dev->type == ARPHRD_SIT ||
436 dev->type == ARPHRD_NONE) {
437 ndev->cnf.use_tempaddr = -1;
439 ipv6_regen_rndid(ndev);
441 ndev->token = in6addr_any;
443 if (netif_running(dev) && addrconf_link_ready(dev))
444 ndev->if_flags |= IF_READY;
446 ipv6_mc_init_dev(ndev);
447 ndev->tstamp = jiffies;
448 err = addrconf_sysctl_register(ndev);
450 ipv6_mc_destroy_dev(ndev);
451 snmp6_unregister_dev(ndev);
454 /* protected by rtnl_lock */
455 rcu_assign_pointer(dev->ip6_ptr, ndev);
457 /* Join interface-local all-node multicast group */
458 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
460 /* Join all-node multicast group */
461 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
463 /* Join all-router multicast group if forwarding is set */
464 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
465 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
470 neigh_parms_release(&nd_tbl, ndev->nd_parms);
472 in6_dev_finish_destroy(ndev);
476 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
478 struct inet6_dev *idev;
482 idev = __in6_dev_get(dev);
484 idev = ipv6_add_dev(dev);
489 if (dev->flags&IFF_UP)
494 static int inet6_netconf_msgsize_devconf(int type)
496 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
497 + nla_total_size(4); /* NETCONFA_IFINDEX */
500 if (type == NETCONFA_ALL)
503 if (all || type == NETCONFA_FORWARDING)
504 size += nla_total_size(4);
505 #ifdef CONFIG_IPV6_MROUTE
506 if (all || type == NETCONFA_MC_FORWARDING)
507 size += nla_total_size(4);
509 if (all || type == NETCONFA_PROXY_NEIGH)
510 size += nla_total_size(4);
512 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
513 size += nla_total_size(4);
518 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
519 struct ipv6_devconf *devconf, u32 portid,
520 u32 seq, int event, unsigned int flags,
523 struct nlmsghdr *nlh;
524 struct netconfmsg *ncm;
527 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
532 if (type == NETCONFA_ALL)
535 ncm = nlmsg_data(nlh);
536 ncm->ncm_family = AF_INET6;
538 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
539 goto nla_put_failure;
544 if ((all || type == NETCONFA_FORWARDING) &&
545 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
546 goto nla_put_failure;
547 #ifdef CONFIG_IPV6_MROUTE
548 if ((all || type == NETCONFA_MC_FORWARDING) &&
549 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
550 devconf->mc_forwarding) < 0)
551 goto nla_put_failure;
553 if ((all || type == NETCONFA_PROXY_NEIGH) &&
554 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
555 goto nla_put_failure;
557 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
558 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
559 devconf->ignore_routes_with_linkdown) < 0)
560 goto nla_put_failure;
567 nlmsg_cancel(skb, nlh);
571 void inet6_netconf_notify_devconf(struct net *net, int event, int type,
572 int ifindex, struct ipv6_devconf *devconf)
577 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL);
581 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
584 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
585 WARN_ON(err == -EMSGSIZE);
589 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL);
592 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
595 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
596 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
597 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
598 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
599 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
602 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
603 struct nlmsghdr *nlh,
604 struct netlink_ext_ack *extack)
606 struct net *net = sock_net(in_skb->sk);
607 struct nlattr *tb[NETCONFA_MAX+1];
608 struct inet6_dev *in6_dev = NULL;
609 struct net_device *dev = NULL;
610 struct netconfmsg *ncm;
612 struct ipv6_devconf *devconf;
616 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
617 devconf_ipv6_policy, extack);
621 if (!tb[NETCONFA_IFINDEX])
625 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
627 case NETCONFA_IFINDEX_ALL:
628 devconf = net->ipv6.devconf_all;
630 case NETCONFA_IFINDEX_DEFAULT:
631 devconf = net->ipv6.devconf_dflt;
634 dev = dev_get_by_index(net, ifindex);
637 in6_dev = in6_dev_get(dev);
640 devconf = &in6_dev->cnf;
645 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL);
649 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
650 NETLINK_CB(in_skb).portid,
651 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
654 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
655 WARN_ON(err == -EMSGSIZE);
659 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
662 in6_dev_put(in6_dev);
668 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
669 struct netlink_callback *cb)
671 struct net *net = sock_net(skb->sk);
674 struct net_device *dev;
675 struct inet6_dev *idev;
676 struct hlist_head *head;
679 s_idx = idx = cb->args[1];
681 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
683 head = &net->dev_index_head[h];
685 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
687 hlist_for_each_entry_rcu(dev, head, index_hlist) {
690 idev = __in6_dev_get(dev);
694 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
696 NETLINK_CB(cb->skb).portid,
704 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
710 if (h == NETDEV_HASHENTRIES) {
711 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
712 net->ipv6.devconf_all,
713 NETLINK_CB(cb->skb).portid,
715 RTM_NEWNETCONF, NLM_F_MULTI,
721 if (h == NETDEV_HASHENTRIES + 1) {
722 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
723 net->ipv6.devconf_dflt,
724 NETLINK_CB(cb->skb).portid,
726 RTM_NEWNETCONF, NLM_F_MULTI,
740 static void dev_forward_change(struct inet6_dev *idev)
742 struct net_device *dev;
743 struct inet6_ifaddr *ifa;
748 if (idev->cnf.forwarding)
749 dev_disable_lro(dev);
750 if (dev->flags & IFF_MULTICAST) {
751 if (idev->cnf.forwarding) {
752 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
753 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
754 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
756 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
757 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
758 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
762 list_for_each_entry(ifa, &idev->addr_list, if_list) {
763 if (ifa->flags&IFA_F_TENTATIVE)
765 if (idev->cnf.forwarding)
766 addrconf_join_anycast(ifa);
768 addrconf_leave_anycast(ifa);
770 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
772 dev->ifindex, &idev->cnf);
776 static void addrconf_forward_change(struct net *net, __s32 newf)
778 struct net_device *dev;
779 struct inet6_dev *idev;
781 for_each_netdev(net, dev) {
782 idev = __in6_dev_get(dev);
784 int changed = (!idev->cnf.forwarding) ^ (!newf);
785 idev->cnf.forwarding = newf;
787 dev_forward_change(idev);
792 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
798 return restart_syscall();
800 net = (struct net *)table->extra2;
804 if (p == &net->ipv6.devconf_dflt->forwarding) {
805 if ((!newf) ^ (!old))
806 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
808 NETCONFA_IFINDEX_DEFAULT,
809 net->ipv6.devconf_dflt);
814 if (p == &net->ipv6.devconf_all->forwarding) {
815 int old_dflt = net->ipv6.devconf_dflt->forwarding;
817 net->ipv6.devconf_dflt->forwarding = newf;
818 if ((!newf) ^ (!old_dflt))
819 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
821 NETCONFA_IFINDEX_DEFAULT,
822 net->ipv6.devconf_dflt);
824 addrconf_forward_change(net, newf);
825 if ((!newf) ^ (!old))
826 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
828 NETCONFA_IFINDEX_ALL,
829 net->ipv6.devconf_all);
830 } else if ((!newf) ^ (!old))
831 dev_forward_change((struct inet6_dev *)table->extra1);
835 rt6_purge_dflt_routers(net);
839 static void addrconf_linkdown_change(struct net *net, __s32 newf)
841 struct net_device *dev;
842 struct inet6_dev *idev;
844 for_each_netdev(net, dev) {
845 idev = __in6_dev_get(dev);
847 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
849 idev->cnf.ignore_routes_with_linkdown = newf;
851 inet6_netconf_notify_devconf(dev_net(dev),
853 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
860 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
866 return restart_syscall();
868 net = (struct net *)table->extra2;
872 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
873 if ((!newf) ^ (!old))
874 inet6_netconf_notify_devconf(net,
876 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
877 NETCONFA_IFINDEX_DEFAULT,
878 net->ipv6.devconf_dflt);
883 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
884 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
885 addrconf_linkdown_change(net, newf);
886 if ((!newf) ^ (!old))
887 inet6_netconf_notify_devconf(net,
889 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
890 NETCONFA_IFINDEX_ALL,
891 net->ipv6.devconf_all);
900 /* Nobody refers to this ifaddr, destroy it */
901 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
903 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
905 #ifdef NET_REFCNT_DEBUG
906 pr_debug("%s\n", __func__);
909 in6_dev_put(ifp->idev);
911 if (cancel_delayed_work(&ifp->dad_work))
912 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
915 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
916 pr_warn("Freeing alive inet6 address %p\n", ifp);
925 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
928 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
931 * Each device address list is sorted in order of scope -
932 * global before linklocal.
934 list_for_each(p, &idev->addr_list) {
935 struct inet6_ifaddr *ifa
936 = list_entry(p, struct inet6_ifaddr, if_list);
937 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
941 list_add_tail_rcu(&ifp->if_list, p);
944 static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr)
946 u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net);
948 return hash_32(val, IN6_ADDR_HSIZE_SHIFT);
951 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
952 struct net_device *dev, unsigned int hash)
954 struct inet6_ifaddr *ifp;
956 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
957 if (!net_eq(dev_net(ifp->idev->dev), net))
959 if (ipv6_addr_equal(&ifp->addr, addr)) {
960 if (!dev || ifp->idev->dev == dev)
967 static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa)
969 unsigned int hash = inet6_addr_hash(dev_net(dev), &ifa->addr);
972 spin_lock(&addrconf_hash_lock);
974 /* Ignore adding duplicate addresses on an interface */
975 if (ipv6_chk_same_addr(dev_net(dev), &ifa->addr, dev, hash)) {
976 netdev_dbg(dev, "ipv6_add_addr: already assigned\n");
979 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
982 spin_unlock(&addrconf_hash_lock);
987 /* On success it returns ifp with increased reference count */
989 static struct inet6_ifaddr *
990 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
991 const struct in6_addr *peer_addr, int pfxlen,
992 int scope, u32 flags, u32 valid_lft, u32 prefered_lft,
993 bool can_block, struct netlink_ext_ack *extack)
995 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC;
996 struct net *net = dev_net(idev->dev);
997 struct inet6_ifaddr *ifa = NULL;
998 struct rt6_info *rt = NULL;
1000 int addr_type = ipv6_addr_type(addr);
1002 if (addr_type == IPV6_ADDR_ANY ||
1003 addr_type & IPV6_ADDR_MULTICAST ||
1004 (!(idev->dev->flags & IFF_LOOPBACK) &&
1005 addr_type & IPV6_ADDR_LOOPBACK))
1006 return ERR_PTR(-EADDRNOTAVAIL);
1009 err = -ENODEV; /*XXX*/
1013 if (idev->cnf.disable_ipv6) {
1018 /* validator notifier needs to be blocking;
1019 * do not call in atomic context
1022 struct in6_validator_info i6vi = {
1028 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi);
1029 err = notifier_to_errno(err);
1034 ifa = kzalloc(sizeof(*ifa), gfp_flags);
1040 rt = addrconf_dst_alloc(net, idev, addr, false);
1047 if (net->ipv6.devconf_all->disable_policy ||
1048 idev->cnf.disable_policy)
1049 rt->dst.flags |= DST_NOPOLICY;
1051 neigh_parms_data_state_setall(idev->nd_parms);
1055 ifa->peer_addr = *peer_addr;
1057 spin_lock_init(&ifa->lock);
1058 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
1059 INIT_HLIST_NODE(&ifa->addr_lst);
1061 ifa->prefix_len = pfxlen;
1063 /* No need to add the TENTATIVE flag for addresses with NODAD */
1064 if (!(flags & IFA_F_NODAD))
1065 ifa->flags |= IFA_F_TENTATIVE;
1066 ifa->valid_lft = valid_lft;
1067 ifa->prefered_lft = prefered_lft;
1068 ifa->cstamp = ifa->tstamp = jiffies;
1069 ifa->tokenized = false;
1077 refcount_set(&ifa->refcnt, 1);
1081 err = ipv6_add_addr_hash(idev->dev, ifa);
1083 rcu_read_unlock_bh();
1087 write_lock(&idev->lock);
1089 /* Add to inet6_dev unicast addr list. */
1090 ipv6_link_dev_addr(idev, ifa);
1092 if (ifa->flags&IFA_F_TEMPORARY) {
1093 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1098 write_unlock(&idev->lock);
1100 rcu_read_unlock_bh();
1102 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1104 if (unlikely(err < 0)) {
1109 in6_dev_put(ifa->idev);
1118 enum cleanup_prefix_rt_t {
1119 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1120 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1121 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1125 * Check, whether the prefix for ifp would still need a prefix route
1126 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1129 * 1) we don't purge prefix if address was not permanent.
1130 * prefix is managed by its own lifetime.
1131 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1132 * 3) if there are no addresses, delete prefix.
1133 * 4) if there are still other permanent address(es),
1134 * corresponding prefix is still permanent.
1135 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1136 * don't purge the prefix, assume user space is managing it.
1137 * 6) otherwise, update prefix lifetime to the
1138 * longest valid lifetime among the corresponding
1139 * addresses on the device.
1140 * Note: subsequent RA will update lifetime.
1142 static enum cleanup_prefix_rt_t
1143 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1145 struct inet6_ifaddr *ifa;
1146 struct inet6_dev *idev = ifp->idev;
1147 unsigned long lifetime;
1148 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1152 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1155 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1158 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1159 return CLEANUP_PREFIX_RT_NOP;
1161 action = CLEANUP_PREFIX_RT_EXPIRE;
1163 spin_lock(&ifa->lock);
1165 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1167 * Note: Because this address is
1168 * not permanent, lifetime <
1169 * LONG_MAX / HZ here.
1171 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1172 *expires = ifa->tstamp + lifetime * HZ;
1173 spin_unlock(&ifa->lock);
1180 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
1182 struct rt6_info *rt;
1184 rt = addrconf_get_prefix_route(&ifp->addr,
1187 0, RTF_GATEWAY | RTF_DEFAULT);
1190 ip6_del_rt(dev_net(ifp->idev->dev), rt);
1192 if (!(rt->rt6i_flags & RTF_EXPIRES))
1193 rt6_set_expires(rt, expires);
1200 /* This function wants to get referenced ifp and releases it before return */
1202 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1205 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1206 unsigned long expires;
1210 spin_lock_bh(&ifp->lock);
1212 ifp->state = INET6_IFADDR_STATE_DEAD;
1213 spin_unlock_bh(&ifp->lock);
1215 if (state == INET6_IFADDR_STATE_DEAD)
1218 spin_lock_bh(&addrconf_hash_lock);
1219 hlist_del_init_rcu(&ifp->addr_lst);
1220 spin_unlock_bh(&addrconf_hash_lock);
1222 write_lock_bh(&ifp->idev->lock);
1224 if (ifp->flags&IFA_F_TEMPORARY) {
1225 list_del(&ifp->tmp_list);
1227 in6_ifa_put(ifp->ifpub);
1233 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1234 action = check_cleanup_prefix_route(ifp, &expires);
1236 list_del_rcu(&ifp->if_list);
1239 write_unlock_bh(&ifp->idev->lock);
1241 addrconf_del_dad_work(ifp);
1243 ipv6_ifa_notify(RTM_DELADDR, ifp);
1245 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1247 if (action != CLEANUP_PREFIX_RT_NOP) {
1248 cleanup_prefix_route(ifp, expires,
1249 action == CLEANUP_PREFIX_RT_DEL);
1252 /* clean up prefsrc entries */
1253 rt6_remove_prefsrc(ifp);
1258 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp,
1259 struct inet6_ifaddr *ift,
1262 struct inet6_dev *idev = ifp->idev;
1263 struct in6_addr addr, *tmpaddr;
1264 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1265 unsigned long regen_advance;
1269 unsigned long now = jiffies;
1270 long max_desync_factor;
1271 s32 cnf_temp_preferred_lft;
1273 write_lock_bh(&idev->lock);
1275 spin_lock_bh(&ift->lock);
1276 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1277 spin_unlock_bh(&ift->lock);
1284 if (idev->cnf.use_tempaddr <= 0) {
1285 write_unlock_bh(&idev->lock);
1286 pr_info("%s: use_tempaddr is disabled\n", __func__);
1291 spin_lock_bh(&ifp->lock);
1292 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1293 idev->cnf.use_tempaddr = -1; /*XXX*/
1294 spin_unlock_bh(&ifp->lock);
1295 write_unlock_bh(&idev->lock);
1296 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1303 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1304 ipv6_try_regen_rndid(idev, tmpaddr);
1305 memcpy(&addr.s6_addr[8], idev->rndid, 8);
1306 age = (now - ifp->tstamp) / HZ;
1308 regen_advance = idev->cnf.regen_max_retry *
1309 idev->cnf.dad_transmits *
1310 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1312 /* recalculate max_desync_factor each time and update
1313 * idev->desync_factor if it's larger
1315 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
1316 max_desync_factor = min_t(__u32,
1317 idev->cnf.max_desync_factor,
1318 cnf_temp_preferred_lft - regen_advance);
1320 if (unlikely(idev->desync_factor > max_desync_factor)) {
1321 if (max_desync_factor > 0) {
1322 get_random_bytes(&idev->desync_factor,
1323 sizeof(idev->desync_factor));
1324 idev->desync_factor %= max_desync_factor;
1326 idev->desync_factor = 0;
1330 tmp_valid_lft = min_t(__u32,
1332 idev->cnf.temp_valid_lft + age);
1333 tmp_prefered_lft = cnf_temp_preferred_lft + age -
1334 idev->desync_factor;
1335 tmp_prefered_lft = min_t(__u32, ifp->prefered_lft, tmp_prefered_lft);
1336 tmp_plen = ifp->prefix_len;
1337 tmp_tstamp = ifp->tstamp;
1338 spin_unlock_bh(&ifp->lock);
1340 write_unlock_bh(&idev->lock);
1342 /* A temporary address is created only if this calculated Preferred
1343 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1344 * an implementation must not create a temporary address with a zero
1345 * Preferred Lifetime.
1346 * Use age calculation as in addrconf_verify to avoid unnecessary
1347 * temporary addresses being generated.
1349 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1350 if (tmp_prefered_lft <= regen_advance + age) {
1357 addr_flags = IFA_F_TEMPORARY;
1358 /* set in addrconf_prefix_rcv() */
1359 if (ifp->flags & IFA_F_OPTIMISTIC)
1360 addr_flags |= IFA_F_OPTIMISTIC;
1362 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1363 ipv6_addr_scope(&addr), addr_flags,
1364 tmp_valid_lft, tmp_prefered_lft, block, NULL);
1368 pr_info("%s: retry temporary address regeneration\n", __func__);
1370 write_lock_bh(&idev->lock);
1374 spin_lock_bh(&ift->lock);
1377 ift->tstamp = tmp_tstamp;
1378 spin_unlock_bh(&ift->lock);
1380 addrconf_dad_start(ift);
1388 * Choose an appropriate source address (RFC3484)
1391 IPV6_SADDR_RULE_INIT = 0,
1392 IPV6_SADDR_RULE_LOCAL,
1393 IPV6_SADDR_RULE_SCOPE,
1394 IPV6_SADDR_RULE_PREFERRED,
1395 #ifdef CONFIG_IPV6_MIP6
1396 IPV6_SADDR_RULE_HOA,
1398 IPV6_SADDR_RULE_OIF,
1399 IPV6_SADDR_RULE_LABEL,
1400 IPV6_SADDR_RULE_PRIVACY,
1401 IPV6_SADDR_RULE_ORCHID,
1402 IPV6_SADDR_RULE_PREFIX,
1403 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1404 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1409 struct ipv6_saddr_score {
1412 struct inet6_ifaddr *ifa;
1413 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1418 struct ipv6_saddr_dst {
1419 const struct in6_addr *addr;
1426 static inline int ipv6_saddr_preferred(int type)
1428 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1433 static bool ipv6_use_optimistic_addr(struct net *net,
1434 struct inet6_dev *idev)
1436 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1439 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1441 if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic)
1450 static bool ipv6_allow_optimistic_dad(struct net *net,
1451 struct inet6_dev *idev)
1453 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1456 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1465 static int ipv6_get_saddr_eval(struct net *net,
1466 struct ipv6_saddr_score *score,
1467 struct ipv6_saddr_dst *dst,
1472 if (i <= score->rule) {
1474 case IPV6_SADDR_RULE_SCOPE:
1475 ret = score->scopedist;
1477 case IPV6_SADDR_RULE_PREFIX:
1478 ret = score->matchlen;
1481 ret = !!test_bit(i, score->scorebits);
1487 case IPV6_SADDR_RULE_INIT:
1488 /* Rule 0: remember if hiscore is not ready yet */
1491 case IPV6_SADDR_RULE_LOCAL:
1492 /* Rule 1: Prefer same address */
1493 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1495 case IPV6_SADDR_RULE_SCOPE:
1496 /* Rule 2: Prefer appropriate scope
1501 * ---+--+-+---> scope
1503 * | d is scope of the destination.
1505 * | \ <- smaller scope is better if
1506 * B-15 | \ if scope is enough for destination.
1507 * | ret = B - scope (-1 <= scope >= d <= 15).
1509 * |/ <- greater is better
1510 * -C / if scope is not enough for destination.
1511 * /| ret = scope - C (-1 <= d < scope <= 15).
1513 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1514 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1515 * Assume B = 0 and we get C > 29.
1517 ret = __ipv6_addr_src_scope(score->addr_type);
1518 if (ret >= dst->scope)
1521 ret -= 128; /* 30 is enough */
1522 score->scopedist = ret;
1524 case IPV6_SADDR_RULE_PREFERRED:
1526 /* Rule 3: Avoid deprecated and optimistic addresses */
1527 u8 avoid = IFA_F_DEPRECATED;
1529 if (!ipv6_use_optimistic_addr(net, score->ifa->idev))
1530 avoid |= IFA_F_OPTIMISTIC;
1531 ret = ipv6_saddr_preferred(score->addr_type) ||
1532 !(score->ifa->flags & avoid);
1535 #ifdef CONFIG_IPV6_MIP6
1536 case IPV6_SADDR_RULE_HOA:
1538 /* Rule 4: Prefer home address */
1539 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1540 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1544 case IPV6_SADDR_RULE_OIF:
1545 /* Rule 5: Prefer outgoing interface */
1546 ret = (!dst->ifindex ||
1547 dst->ifindex == score->ifa->idev->dev->ifindex);
1549 case IPV6_SADDR_RULE_LABEL:
1550 /* Rule 6: Prefer matching label */
1551 ret = ipv6_addr_label(net,
1552 &score->ifa->addr, score->addr_type,
1553 score->ifa->idev->dev->ifindex) == dst->label;
1555 case IPV6_SADDR_RULE_PRIVACY:
1557 /* Rule 7: Prefer public address
1558 * Note: prefer temporary address if use_tempaddr >= 2
1560 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1561 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1562 score->ifa->idev->cnf.use_tempaddr >= 2;
1563 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1566 case IPV6_SADDR_RULE_ORCHID:
1567 /* Rule 8-: Prefer ORCHID vs ORCHID or
1568 * non-ORCHID vs non-ORCHID
1570 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1571 ipv6_addr_orchid(dst->addr));
1573 case IPV6_SADDR_RULE_PREFIX:
1574 /* Rule 8: Use longest matching prefix */
1575 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1576 if (ret > score->ifa->prefix_len)
1577 ret = score->ifa->prefix_len;
1578 score->matchlen = ret;
1580 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1581 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1582 /* Optimistic addresses still have lower precedence than other
1583 * preferred addresses.
1585 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1593 __set_bit(i, score->scorebits);
1599 static int __ipv6_dev_get_saddr(struct net *net,
1600 struct ipv6_saddr_dst *dst,
1601 struct inet6_dev *idev,
1602 struct ipv6_saddr_score *scores,
1605 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1607 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) {
1611 * - Tentative Address (RFC2462 section 5.4)
1612 * - A tentative address is not considered
1613 * "assigned to an interface" in the traditional
1614 * sense, unless it is also flagged as optimistic.
1615 * - Candidate Source Address (section 4)
1616 * - In any case, anycast addresses, multicast
1617 * addresses, and the unspecified address MUST
1618 * NOT be included in a candidate set.
1620 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1621 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1624 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1626 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1627 score->addr_type & IPV6_ADDR_MULTICAST)) {
1628 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1634 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1636 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1637 int minihiscore, miniscore;
1639 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1640 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1642 if (minihiscore > miniscore) {
1643 if (i == IPV6_SADDR_RULE_SCOPE &&
1644 score->scopedist > 0) {
1647 * each remaining entry
1648 * has too small (not enough)
1649 * scope, because ifa entries
1650 * are sorted by their scope
1656 } else if (minihiscore < miniscore) {
1657 swap(hiscore, score);
1658 hiscore_idx = 1 - hiscore_idx;
1660 /* restore our iterator */
1661 score->ifa = hiscore->ifa;
1671 static int ipv6_get_saddr_master(struct net *net,
1672 const struct net_device *dst_dev,
1673 const struct net_device *master,
1674 struct ipv6_saddr_dst *dst,
1675 struct ipv6_saddr_score *scores,
1678 struct inet6_dev *idev;
1680 idev = __in6_dev_get(dst_dev);
1682 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1683 scores, hiscore_idx);
1685 idev = __in6_dev_get(master);
1687 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1688 scores, hiscore_idx);
1693 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1694 const struct in6_addr *daddr, unsigned int prefs,
1695 struct in6_addr *saddr)
1697 struct ipv6_saddr_score scores[2], *hiscore;
1698 struct ipv6_saddr_dst dst;
1699 struct inet6_dev *idev;
1700 struct net_device *dev;
1702 bool use_oif_addr = false;
1703 int hiscore_idx = 0;
1706 dst_type = __ipv6_addr_type(daddr);
1708 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1709 dst.scope = __ipv6_addr_src_scope(dst_type);
1710 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1713 scores[hiscore_idx].rule = -1;
1714 scores[hiscore_idx].ifa = NULL;
1718 /* Candidate Source Address (section 4)
1719 * - multicast and link-local destination address,
1720 * the set of candidate source address MUST only
1721 * include addresses assigned to interfaces
1722 * belonging to the same link as the outgoing
1724 * (- For site-local destination addresses, the
1725 * set of candidate source addresses MUST only
1726 * include addresses assigned to interfaces
1727 * belonging to the same site as the outgoing
1729 * - "It is RECOMMENDED that the candidate source addresses
1730 * be the set of unicast addresses assigned to the
1731 * interface that will be used to send to the destination
1732 * (the 'outgoing' interface)." (RFC 6724)
1735 idev = __in6_dev_get(dst_dev);
1736 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1737 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1738 (idev && idev->cnf.use_oif_addrs_only)) {
1739 use_oif_addr = true;
1745 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1747 const struct net_device *master;
1750 /* if dst_dev exists and is enslaved to an L3 device, then
1751 * prefer addresses from dst_dev and then the master over
1752 * any other enslaved devices in the L3 domain.
1754 master = l3mdev_master_dev_rcu(dst_dev);
1756 master_idx = master->ifindex;
1758 hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1760 scores, hiscore_idx);
1762 if (scores[hiscore_idx].ifa)
1766 for_each_netdev_rcu(net, dev) {
1767 /* only consider addresses on devices in the
1770 if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1772 idev = __in6_dev_get(dev);
1775 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1780 hiscore = &scores[hiscore_idx];
1782 ret = -EADDRNOTAVAIL;
1784 *saddr = hiscore->ifa->addr;
1789 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1791 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1794 struct inet6_ifaddr *ifp;
1795 int err = -EADDRNOTAVAIL;
1797 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1798 if (ifp->scope > IFA_LINK)
1800 if (ifp->scope == IFA_LINK &&
1801 !(ifp->flags & banned_flags)) {
1810 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1813 struct inet6_dev *idev;
1814 int err = -EADDRNOTAVAIL;
1817 idev = __in6_dev_get(dev);
1819 read_lock_bh(&idev->lock);
1820 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1821 read_unlock_bh(&idev->lock);
1827 static int ipv6_count_addresses(const struct inet6_dev *idev)
1829 const struct inet6_ifaddr *ifp;
1833 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list)
1839 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1840 const struct net_device *dev, int strict)
1842 return ipv6_chk_addr_and_flags(net, addr, dev, !dev,
1843 strict, IFA_F_TENTATIVE);
1845 EXPORT_SYMBOL(ipv6_chk_addr);
1847 /* device argument is used to find the L3 domain of interest. If
1848 * skip_dev_check is set, then the ifp device is not checked against
1849 * the passed in dev argument. So the 2 cases for addresses checks are:
1850 * 1. does the address exist in the L3 domain that dev is part of
1851 * (skip_dev_check = true), or
1853 * 2. does the address exist on the specific device
1854 * (skip_dev_check = false)
1856 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1857 const struct net_device *dev, bool skip_dev_check,
1858 int strict, u32 banned_flags)
1860 unsigned int hash = inet6_addr_hash(net, addr);
1861 const struct net_device *l3mdev;
1862 struct inet6_ifaddr *ifp;
1867 l3mdev = l3mdev_master_dev_rcu(dev);
1871 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1872 if (!net_eq(dev_net(ifp->idev->dev), net))
1875 if (l3mdev_master_dev_rcu(ifp->idev->dev) != l3mdev)
1878 /* Decouple optimistic from tentative for evaluation here.
1879 * Ban optimistic addresses explicitly, when required.
1881 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1882 ? (ifp->flags&~IFA_F_TENTATIVE)
1884 if (ipv6_addr_equal(&ifp->addr, addr) &&
1885 !(ifp_flags&banned_flags) &&
1886 (!dev || ifp->idev->dev == dev ||
1887 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1896 EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1899 /* Compares an address/prefix_len with addresses on device @dev.
1900 * If one is found it returns true.
1902 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1903 const unsigned int prefix_len, struct net_device *dev)
1905 const struct inet6_ifaddr *ifa;
1906 const struct inet6_dev *idev;
1910 idev = __in6_dev_get(dev);
1912 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
1913 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1922 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1924 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1926 const struct inet6_ifaddr *ifa;
1927 const struct inet6_dev *idev;
1932 idev = __in6_dev_get(dev);
1934 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
1935 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1944 EXPORT_SYMBOL(ipv6_chk_prefix);
1946 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1947 struct net_device *dev, int strict)
1949 unsigned int hash = inet6_addr_hash(net, addr);
1950 struct inet6_ifaddr *ifp, *result = NULL;
1953 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1954 if (!net_eq(dev_net(ifp->idev->dev), net))
1956 if (ipv6_addr_equal(&ifp->addr, addr)) {
1957 if (!dev || ifp->idev->dev == dev ||
1958 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1970 /* Gets referenced address, destroys ifaddr */
1972 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1975 ifp->flags |= IFA_F_DADFAILED;
1977 if (ifp->flags&IFA_F_TEMPORARY) {
1978 struct inet6_ifaddr *ifpub;
1979 spin_lock_bh(&ifp->lock);
1982 in6_ifa_hold(ifpub);
1983 spin_unlock_bh(&ifp->lock);
1984 ipv6_create_tempaddr(ifpub, ifp, true);
1987 spin_unlock_bh(&ifp->lock);
1990 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) {
1991 spin_lock_bh(&ifp->lock);
1992 addrconf_del_dad_work(ifp);
1993 ifp->flags |= IFA_F_TENTATIVE;
1995 ifp->flags &= ~IFA_F_OPTIMISTIC;
1996 spin_unlock_bh(&ifp->lock);
1998 ipv6_ifa_notify(0, ifp);
2005 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
2009 spin_lock_bh(&ifp->lock);
2010 if (ifp->state == INET6_IFADDR_STATE_DAD) {
2011 ifp->state = INET6_IFADDR_STATE_POSTDAD;
2014 spin_unlock_bh(&ifp->lock);
2019 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp)
2021 struct inet6_dev *idev = ifp->idev;
2022 struct net *net = dev_net(ifp->idev->dev);
2024 if (addrconf_dad_end(ifp)) {
2029 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n",
2030 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source);
2032 spin_lock_bh(&ifp->lock);
2034 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
2035 int scope = ifp->scope;
2036 u32 flags = ifp->flags;
2037 struct in6_addr new_addr;
2038 struct inet6_ifaddr *ifp2;
2039 u32 valid_lft, preferred_lft;
2040 int pfxlen = ifp->prefix_len;
2041 int retries = ifp->stable_privacy_retry + 1;
2043 if (retries > net->ipv6.sysctl.idgen_retries) {
2044 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
2045 ifp->idev->dev->name);
2049 new_addr = ifp->addr;
2050 if (ipv6_generate_stable_address(&new_addr, retries,
2054 valid_lft = ifp->valid_lft;
2055 preferred_lft = ifp->prefered_lft;
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, &new_addr, NULL, pfxlen,
2068 scope, flags, valid_lft,
2069 preferred_lft, false, NULL);
2073 spin_lock_bh(&ifp2->lock);
2074 ifp2->stable_privacy_retry = retries;
2075 ifp2->state = INET6_IFADDR_STATE_PREDAD;
2076 spin_unlock_bh(&ifp2->lock);
2078 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
2081 spin_lock_bh(&ifp->lock);
2085 /* transition from _POSTDAD to _ERRDAD */
2086 ifp->state = INET6_IFADDR_STATE_ERRDAD;
2087 spin_unlock_bh(&ifp->lock);
2089 addrconf_mod_dad_work(ifp, 0);
2093 /* Join to solicited addr multicast group.
2094 * caller must hold RTNL */
2095 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
2097 struct in6_addr maddr;
2099 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2102 addrconf_addr_solict_mult(addr, &maddr);
2103 ipv6_dev_mc_inc(dev, &maddr);
2106 /* caller must hold RTNL */
2107 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
2109 struct in6_addr maddr;
2111 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2114 addrconf_addr_solict_mult(addr, &maddr);
2115 __ipv6_dev_mc_dec(idev, &maddr);
2118 /* caller must hold RTNL */
2119 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
2121 struct in6_addr addr;
2123 if (ifp->prefix_len >= 127) /* RFC 6164 */
2125 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2126 if (ipv6_addr_any(&addr))
2128 __ipv6_dev_ac_inc(ifp->idev, &addr);
2131 /* caller must hold RTNL */
2132 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
2134 struct in6_addr addr;
2136 if (ifp->prefix_len >= 127) /* RFC 6164 */
2138 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2139 if (ipv6_addr_any(&addr))
2141 __ipv6_dev_ac_dec(ifp->idev, &addr);
2144 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev)
2146 switch (dev->addr_len) {
2148 memcpy(eui, dev->dev_addr, 3);
2151 memcpy(eui + 5, dev->dev_addr + 3, 3);
2153 case EUI64_ADDR_LEN:
2154 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2164 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2166 union fwnet_hwaddr *ha;
2168 if (dev->addr_len != FWNET_ALEN)
2171 ha = (union fwnet_hwaddr *)dev->dev_addr;
2173 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2178 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2180 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2181 if (dev->addr_len != ARCNET_ALEN)
2184 eui[7] = *(u8 *)dev->dev_addr;
2188 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2190 if (dev->addr_len != INFINIBAND_ALEN)
2192 memcpy(eui, dev->dev_addr + 12, 8);
2197 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
2201 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2202 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2203 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2204 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2205 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2206 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2210 memcpy(eui + 4, &addr, 4);
2214 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2216 if (dev->priv_flags & IFF_ISATAP)
2217 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2221 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2223 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2226 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2228 memcpy(eui, dev->perm_addr, 3);
2229 memcpy(eui + 5, dev->perm_addr + 3, 3);
2236 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2238 switch (dev->type) {
2241 return addrconf_ifid_eui48(eui, dev);
2243 return addrconf_ifid_arcnet(eui, dev);
2244 case ARPHRD_INFINIBAND:
2245 return addrconf_ifid_infiniband(eui, dev);
2247 return addrconf_ifid_sit(eui, dev);
2250 return addrconf_ifid_gre(eui, dev);
2251 case ARPHRD_6LOWPAN:
2252 return addrconf_ifid_6lowpan(eui, dev);
2253 case ARPHRD_IEEE1394:
2254 return addrconf_ifid_ieee1394(eui, dev);
2255 case ARPHRD_TUNNEL6:
2257 return addrconf_ifid_ip6tnl(eui, dev);
2262 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2265 struct inet6_ifaddr *ifp;
2267 read_lock_bh(&idev->lock);
2268 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2269 if (ifp->scope > IFA_LINK)
2271 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2272 memcpy(eui, ifp->addr.s6_addr+8, 8);
2277 read_unlock_bh(&idev->lock);
2281 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
2282 static void ipv6_regen_rndid(struct inet6_dev *idev)
2285 get_random_bytes(idev->rndid, sizeof(idev->rndid));
2286 idev->rndid[0] &= ~0x02;
2289 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2290 * check if generated address is not inappropriate
2292 * - Reserved subnet anycast (RFC 2526)
2293 * 11111101 11....11 1xxxxxxx
2294 * - ISATAP (RFC4214) 6.1
2295 * 00-00-5E-FE-xx-xx-xx-xx
2297 * - XXX: already assigned to an address on the device
2299 if (idev->rndid[0] == 0xfd &&
2300 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2301 (idev->rndid[7]&0x80))
2303 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2304 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2306 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2311 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
2313 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
2314 ipv6_regen_rndid(idev);
2322 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
2323 unsigned long expires, u32 flags)
2325 struct fib6_config cfg = {
2326 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
2327 .fc_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, NULL);
2352 static struct rt6_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 rt6_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->dst.dev->ifindex != dev->ifindex)
2374 if ((rt->rt6i_flags & flags) != flags)
2376 if ((rt->rt6i_flags & noflags) != 0)
2378 if (!dst_hold_safe(&rt->dst))
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_UNICAST,
2399 .fc_nlinfo.nl_net = dev_net(dev),
2402 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2404 ip6_route_add(&cfg, NULL);
2407 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2409 struct inet6_dev *idev;
2413 idev = ipv6_find_idev(dev);
2415 return ERR_PTR(-ENOBUFS);
2417 if (idev->cnf.disable_ipv6)
2418 return ERR_PTR(-EACCES);
2420 /* Add default multicast route */
2421 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
2422 addrconf_add_mroute(dev);
2427 static void manage_tempaddrs(struct inet6_dev *idev,
2428 struct inet6_ifaddr *ifp,
2429 __u32 valid_lft, __u32 prefered_lft,
2430 bool create, unsigned long now)
2433 struct inet6_ifaddr *ift;
2435 read_lock_bh(&idev->lock);
2436 /* update all temporary addresses in the list */
2437 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2438 int age, max_valid, max_prefered;
2440 if (ifp != ift->ifpub)
2443 /* RFC 4941 section 3.3:
2444 * If a received option will extend the lifetime of a public
2445 * address, the lifetimes of temporary addresses should
2446 * be extended, subject to the overall constraint that no
2447 * temporary addresses should ever remain "valid" or "preferred"
2448 * for a time longer than (TEMP_VALID_LIFETIME) or
2449 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2451 age = (now - ift->cstamp) / HZ;
2452 max_valid = idev->cnf.temp_valid_lft - age;
2456 max_prefered = idev->cnf.temp_prefered_lft -
2457 idev->desync_factor - age;
2458 if (max_prefered < 0)
2461 if (valid_lft > max_valid)
2462 valid_lft = max_valid;
2464 if (prefered_lft > max_prefered)
2465 prefered_lft = max_prefered;
2467 spin_lock(&ift->lock);
2469 ift->valid_lft = valid_lft;
2470 ift->prefered_lft = prefered_lft;
2472 if (prefered_lft > 0)
2473 ift->flags &= ~IFA_F_DEPRECATED;
2475 spin_unlock(&ift->lock);
2476 if (!(flags&IFA_F_TENTATIVE))
2477 ipv6_ifa_notify(0, ift);
2480 if ((create || list_empty(&idev->tempaddr_list)) &&
2481 idev->cnf.use_tempaddr > 0) {
2482 /* When a new public address is created as described
2483 * in [ADDRCONF], also create a new temporary address.
2484 * Also create a temporary address if it's enabled but
2485 * no temporary address currently exists.
2487 read_unlock_bh(&idev->lock);
2488 ipv6_create_tempaddr(ifp, NULL, false);
2490 read_unlock_bh(&idev->lock);
2494 static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2496 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2497 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2500 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2501 const struct prefix_info *pinfo,
2502 struct inet6_dev *in6_dev,
2503 const struct in6_addr *addr, int addr_type,
2504 u32 addr_flags, bool sllao, bool tokenized,
2505 __u32 valid_lft, u32 prefered_lft)
2507 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2508 int create = 0, update_lft = 0;
2510 if (!ifp && valid_lft) {
2511 int max_addresses = in6_dev->cnf.max_addresses;
2513 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2514 if ((net->ipv6.devconf_all->optimistic_dad ||
2515 in6_dev->cnf.optimistic_dad) &&
2516 !net->ipv6.devconf_all->forwarding && sllao)
2517 addr_flags |= IFA_F_OPTIMISTIC;
2520 /* Do not allow to create too much of autoconfigured
2521 * addresses; this would be too easy way to crash kernel.
2523 if (!max_addresses ||
2524 ipv6_count_addresses(in6_dev) < max_addresses)
2525 ifp = ipv6_add_addr(in6_dev, addr, NULL,
2527 addr_type&IPV6_ADDR_SCOPE_MASK,
2528 addr_flags, valid_lft,
2529 prefered_lft, false, NULL);
2531 if (IS_ERR_OR_NULL(ifp))
2535 spin_lock_bh(&ifp->lock);
2536 ifp->flags |= IFA_F_MANAGETEMPADDR;
2537 ifp->cstamp = jiffies;
2538 ifp->tokenized = tokenized;
2539 spin_unlock_bh(&ifp->lock);
2540 addrconf_dad_start(ifp);
2548 /* update lifetime (RFC2462 5.5.3 e) */
2549 spin_lock_bh(&ifp->lock);
2551 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2552 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2555 if (!create && stored_lft) {
2556 const u32 minimum_lft = min_t(u32,
2557 stored_lft, MIN_VALID_LIFETIME);
2558 valid_lft = max(valid_lft, minimum_lft);
2560 /* RFC4862 Section 5.5.3e:
2561 * "Note that the preferred lifetime of the
2562 * corresponding address is always reset to
2563 * the Preferred Lifetime in the received
2564 * Prefix Information option, regardless of
2565 * whether the valid lifetime is also reset or
2568 * So we should always update prefered_lft here.
2574 ifp->valid_lft = valid_lft;
2575 ifp->prefered_lft = prefered_lft;
2578 ifp->flags &= ~IFA_F_DEPRECATED;
2579 spin_unlock_bh(&ifp->lock);
2581 if (!(flags&IFA_F_TENTATIVE))
2582 ipv6_ifa_notify(0, ifp);
2584 spin_unlock_bh(&ifp->lock);
2586 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2595 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
2597 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2599 struct prefix_info *pinfo;
2604 struct inet6_dev *in6_dev;
2605 struct net *net = dev_net(dev);
2607 pinfo = (struct prefix_info *) opt;
2609 if (len < sizeof(struct prefix_info)) {
2610 netdev_dbg(dev, "addrconf: prefix option too short\n");
2615 * Validation checks ([ADDRCONF], page 19)
2618 addr_type = ipv6_addr_type(&pinfo->prefix);
2620 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2623 valid_lft = ntohl(pinfo->valid);
2624 prefered_lft = ntohl(pinfo->prefered);
2626 if (prefered_lft > valid_lft) {
2627 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2631 in6_dev = in6_dev_get(dev);
2634 net_dbg_ratelimited("addrconf: device %s not configured\n",
2640 * Two things going on here:
2641 * 1) Add routes for on-link prefixes
2642 * 2) Configure prefixes with the auto flag set
2645 if (pinfo->onlink) {
2646 struct rt6_info *rt;
2647 unsigned long rt_expires;
2649 /* Avoid arithmetic overflow. Really, we could
2650 * save rt_expires in seconds, likely valid_lft,
2651 * but it would require division in fib gc, that it
2655 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2657 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2659 if (addrconf_finite_timeout(rt_expires))
2662 rt = addrconf_get_prefix_route(&pinfo->prefix,
2665 RTF_ADDRCONF | RTF_PREFIX_RT,
2666 RTF_GATEWAY | RTF_DEFAULT);
2669 /* Autoconf prefix route */
2670 if (valid_lft == 0) {
2671 ip6_del_rt(net, rt);
2673 } else if (addrconf_finite_timeout(rt_expires)) {
2675 rt6_set_expires(rt, jiffies + rt_expires);
2677 rt6_clean_expires(rt);
2679 } else if (valid_lft) {
2680 clock_t expires = 0;
2681 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2682 if (addrconf_finite_timeout(rt_expires)) {
2684 flags |= RTF_EXPIRES;
2685 expires = jiffies_to_clock_t(rt_expires);
2687 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2688 dev, expires, flags);
2693 /* Try to figure out our local address for this prefix */
2695 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2696 struct in6_addr addr;
2697 bool tokenized = false, dev_addr_generated = false;
2699 if (pinfo->prefix_len == 64) {
2700 memcpy(&addr, &pinfo->prefix, 8);
2702 if (!ipv6_addr_any(&in6_dev->token)) {
2703 read_lock_bh(&in6_dev->lock);
2704 memcpy(addr.s6_addr + 8,
2705 in6_dev->token.s6_addr + 8, 8);
2706 read_unlock_bh(&in6_dev->lock);
2708 } else if (is_addr_mode_generate_stable(in6_dev) &&
2709 !ipv6_generate_stable_address(&addr, 0,
2711 addr_flags |= IFA_F_STABLE_PRIVACY;
2713 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2714 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2717 dev_addr_generated = true;
2721 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2726 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2729 tokenized, valid_lft,
2734 /* Ignore error case here because previous prefix add addr was
2735 * successful which will be notified.
2737 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2738 addr_type, addr_flags, sllao,
2739 tokenized, valid_lft,
2741 dev_addr_generated);
2743 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2745 in6_dev_put(in6_dev);
2749 * Set destination address.
2750 * Special case for SIT interfaces where we create a new "virtual"
2753 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2755 struct in6_ifreq ireq;
2756 struct net_device *dev;
2762 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2765 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2771 #if IS_ENABLED(CONFIG_IPV6_SIT)
2772 if (dev->type == ARPHRD_SIT) {
2773 const struct net_device_ops *ops = dev->netdev_ops;
2775 struct ip_tunnel_parm p;
2777 err = -EADDRNOTAVAIL;
2778 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2781 memset(&p, 0, sizeof(p));
2782 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2786 p.iph.protocol = IPPROTO_IPV6;
2788 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2790 if (ops->ndo_do_ioctl) {
2791 mm_segment_t oldfs = get_fs();
2794 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2801 dev = __dev_get_by_name(net, p.name);
2804 err = dev_open(dev);
2814 static int ipv6_mc_config(struct sock *sk, bool join,
2815 const struct in6_addr *addr, int ifindex)
2823 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2825 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2832 * Manual configuration of address on an interface
2834 static int inet6_addr_add(struct net *net, int ifindex,
2835 const struct in6_addr *pfx,
2836 const struct in6_addr *peer_pfx,
2837 unsigned int plen, __u32 ifa_flags,
2838 __u32 prefered_lft, __u32 valid_lft,
2839 struct netlink_ext_ack *extack)
2841 struct inet6_ifaddr *ifp;
2842 struct inet6_dev *idev;
2843 struct net_device *dev;
2844 unsigned long timeout;
2854 /* check the lifetime */
2855 if (!valid_lft || prefered_lft > valid_lft)
2858 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2861 dev = __dev_get_by_index(net, ifindex);
2865 idev = addrconf_add_dev(dev);
2867 return PTR_ERR(idev);
2869 if (ifa_flags & IFA_F_MCAUTOJOIN) {
2870 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2871 true, pfx, ifindex);
2877 scope = ipv6_addr_scope(pfx);
2879 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2880 if (addrconf_finite_timeout(timeout)) {
2881 expires = jiffies_to_clock_t(timeout * HZ);
2882 valid_lft = timeout;
2883 flags = RTF_EXPIRES;
2887 ifa_flags |= IFA_F_PERMANENT;
2890 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2891 if (addrconf_finite_timeout(timeout)) {
2893 ifa_flags |= IFA_F_DEPRECATED;
2894 prefered_lft = timeout;
2897 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2898 valid_lft, prefered_lft, true, extack);
2901 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2902 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2906 /* Send a netlink notification if DAD is enabled and
2907 * optimistic flag is not set
2909 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD)))
2910 ipv6_ifa_notify(0, ifp);
2912 * Note that section 3.1 of RFC 4429 indicates
2913 * that the Optimistic flag should not be set for
2914 * manually configured addresses
2916 addrconf_dad_start(ifp);
2917 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2918 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2921 addrconf_verify_rtnl();
2923 } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2924 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2925 false, pfx, ifindex);
2928 return PTR_ERR(ifp);
2931 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2932 const struct in6_addr *pfx, unsigned int plen)
2934 struct inet6_ifaddr *ifp;
2935 struct inet6_dev *idev;
2936 struct net_device *dev;
2941 dev = __dev_get_by_index(net, ifindex);
2945 idev = __in6_dev_get(dev);
2949 read_lock_bh(&idev->lock);
2950 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2951 if (ifp->prefix_len == plen &&
2952 ipv6_addr_equal(pfx, &ifp->addr)) {
2954 read_unlock_bh(&idev->lock);
2956 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2957 (ifa_flags & IFA_F_MANAGETEMPADDR))
2958 manage_tempaddrs(idev, ifp, 0, 0, false,
2961 addrconf_verify_rtnl();
2962 if (ipv6_addr_is_multicast(pfx)) {
2963 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2964 false, pfx, dev->ifindex);
2969 read_unlock_bh(&idev->lock);
2970 return -EADDRNOTAVAIL;
2974 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2976 struct in6_ifreq ireq;
2979 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2982 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2986 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2987 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2988 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME, NULL);
2993 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2995 struct in6_ifreq ireq;
2998 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3001 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3005 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
3006 ireq.ifr6_prefixlen);
3011 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
3012 int plen, int scope)
3014 struct inet6_ifaddr *ifp;
3016 ifp = ipv6_add_addr(idev, addr, NULL, plen,
3017 scope, IFA_F_PERMANENT,
3018 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME,
3021 spin_lock_bh(&ifp->lock);
3022 ifp->flags &= ~IFA_F_TENTATIVE;
3023 spin_unlock_bh(&ifp->lock);
3024 rt_genid_bump_ipv6(dev_net(idev->dev));
3025 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3030 #if IS_ENABLED(CONFIG_IPV6_SIT)
3031 static void sit_add_v4_addrs(struct inet6_dev *idev)
3033 struct in6_addr addr;
3034 struct net_device *dev;
3035 struct net *net = dev_net(idev->dev);
3041 memset(&addr, 0, sizeof(struct in6_addr));
3042 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
3044 if (idev->dev->flags&IFF_POINTOPOINT) {
3045 addr.s6_addr32[0] = htonl(0xfe800000);
3049 scope = IPV6_ADDR_COMPATv4;
3051 pflags |= RTF_NONEXTHOP;
3054 if (addr.s6_addr32[3]) {
3055 add_addr(idev, &addr, plen, scope);
3056 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
3060 for_each_netdev(net, dev) {
3061 struct in_device *in_dev = __in_dev_get_rtnl(dev);
3062 if (in_dev && (dev->flags & IFF_UP)) {
3063 struct in_ifaddr *ifa;
3067 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
3069 addr.s6_addr32[3] = ifa->ifa_local;
3071 if (ifa->ifa_scope == RT_SCOPE_LINK)
3073 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
3074 if (idev->dev->flags&IFF_POINTOPOINT)
3079 add_addr(idev, &addr, plen, flag);
3080 addrconf_prefix_route(&addr, plen, idev->dev, 0,
3088 static void init_loopback(struct net_device *dev)
3090 struct inet6_dev *idev;
3096 idev = ipv6_find_idev(dev);
3098 pr_debug("%s: add_dev failed\n", __func__);
3102 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
3105 void addrconf_add_linklocal(struct inet6_dev *idev,
3106 const struct in6_addr *addr, u32 flags)
3108 struct inet6_ifaddr *ifp;
3109 u32 addr_flags = flags | IFA_F_PERMANENT;
3111 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3112 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad ||
3113 idev->cnf.optimistic_dad) &&
3114 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
3115 addr_flags |= IFA_F_OPTIMISTIC;
3118 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
3119 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME, true, NULL);
3121 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
3122 addrconf_dad_start(ifp);
3126 EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
3128 static bool ipv6_reserved_interfaceid(struct in6_addr address)
3130 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3133 if (address.s6_addr32[2] == htonl(0x02005eff) &&
3134 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3137 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3138 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3144 static int ipv6_generate_stable_address(struct in6_addr *address,
3146 const struct inet6_dev *idev)
3148 static DEFINE_SPINLOCK(lock);
3149 static __u32 digest[SHA_DIGEST_WORDS];
3150 static __u32 workspace[SHA_WORKSPACE_WORDS];
3153 char __data[SHA_MESSAGE_BYTES];
3155 struct in6_addr secret;
3157 unsigned char hwaddr[MAX_ADDR_LEN];
3162 struct in6_addr secret;
3163 struct in6_addr temp;
3164 struct net *net = dev_net(idev->dev);
3166 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3168 if (idev->cnf.stable_secret.initialized)
3169 secret = idev->cnf.stable_secret.secret;
3170 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3171 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3176 spin_lock_bh(&lock);
3179 memset(&data, 0, sizeof(data));
3180 memset(workspace, 0, sizeof(workspace));
3181 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3182 data.prefix[0] = address->s6_addr32[0];
3183 data.prefix[1] = address->s6_addr32[1];
3184 data.secret = secret;
3185 data.dad_count = dad_count;
3187 sha_transform(digest, data.__data, workspace);
3190 temp.s6_addr32[2] = (__force __be32)digest[0];
3191 temp.s6_addr32[3] = (__force __be32)digest[1];
3193 spin_unlock_bh(&lock);
3195 if (ipv6_reserved_interfaceid(temp)) {
3197 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3206 static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3208 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3212 s = &idev->cnf.stable_secret;
3213 get_random_bytes(&s->secret, sizeof(s->secret));
3214 s->initialized = true;
3217 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3219 struct in6_addr addr;
3221 /* no link local addresses on L3 master devices */
3222 if (netif_is_l3_master(idev->dev))
3225 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3227 switch (idev->cnf.addr_gen_mode) {
3228 case IN6_ADDR_GEN_MODE_RANDOM:
3229 ipv6_gen_mode_random_init(idev);
3231 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
3232 if (!ipv6_generate_stable_address(&addr, 0, idev))
3233 addrconf_add_linklocal(idev, &addr,
3234 IFA_F_STABLE_PRIVACY);
3235 else if (prefix_route)
3236 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3238 case IN6_ADDR_GEN_MODE_EUI64:
3239 /* addrconf_add_linklocal also adds a prefix_route and we
3240 * only need to care about prefix routes if ipv6_generate_eui64
3241 * couldn't generate one.
3243 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3244 addrconf_add_linklocal(idev, &addr, 0);
3245 else if (prefix_route)
3246 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3248 case IN6_ADDR_GEN_MODE_NONE:
3250 /* will not add any link local address */
3255 static void addrconf_dev_config(struct net_device *dev)
3257 struct inet6_dev *idev;
3261 if ((dev->type != ARPHRD_ETHER) &&
3262 (dev->type != ARPHRD_FDDI) &&
3263 (dev->type != ARPHRD_ARCNET) &&
3264 (dev->type != ARPHRD_INFINIBAND) &&
3265 (dev->type != ARPHRD_IEEE1394) &&
3266 (dev->type != ARPHRD_TUNNEL6) &&
3267 (dev->type != ARPHRD_6LOWPAN) &&
3268 (dev->type != ARPHRD_IP6GRE) &&
3269 (dev->type != ARPHRD_IPGRE) &&
3270 (dev->type != ARPHRD_TUNNEL) &&
3271 (dev->type != ARPHRD_NONE)) {
3272 /* Alas, we support only Ethernet autoconfiguration. */
3276 idev = addrconf_add_dev(dev);
3280 /* this device type has no EUI support */
3281 if (dev->type == ARPHRD_NONE &&
3282 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3283 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
3285 addrconf_addr_gen(idev, false);
3288 #if IS_ENABLED(CONFIG_IPV6_SIT)
3289 static void addrconf_sit_config(struct net_device *dev)
3291 struct inet6_dev *idev;
3296 * Configure the tunnel with one of our IPv4
3297 * addresses... we should configure all of
3298 * our v4 addrs in the tunnel
3301 idev = ipv6_find_idev(dev);
3303 pr_debug("%s: add_dev failed\n", __func__);
3307 if (dev->priv_flags & IFF_ISATAP) {
3308 addrconf_addr_gen(idev, false);
3312 sit_add_v4_addrs(idev);
3314 if (dev->flags&IFF_POINTOPOINT)
3315 addrconf_add_mroute(dev);
3319 #if IS_ENABLED(CONFIG_NET_IPGRE)
3320 static void addrconf_gre_config(struct net_device *dev)
3322 struct inet6_dev *idev;
3326 idev = ipv6_find_idev(dev);
3328 pr_debug("%s: add_dev failed\n", __func__);
3332 addrconf_addr_gen(idev, true);
3333 if (dev->flags & IFF_POINTOPOINT)
3334 addrconf_add_mroute(dev);
3338 static int fixup_permanent_addr(struct net *net,
3339 struct inet6_dev *idev,
3340 struct inet6_ifaddr *ifp)
3342 /* !rt6i_node means the host route was removed from the
3343 * FIB, for example, if 'lo' device is taken down. In that
3344 * case regenerate the host route.
3346 if (!ifp->rt || !ifp->rt->rt6i_node) {
3347 struct rt6_info *rt, *prev;
3349 rt = addrconf_dst_alloc(net, idev, &ifp->addr, false);
3353 /* ifp->rt can be accessed outside of rtnl */
3354 spin_lock(&ifp->lock);
3357 spin_unlock(&ifp->lock);
3362 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3363 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3367 if (ifp->state == INET6_IFADDR_STATE_PREDAD)
3368 addrconf_dad_start(ifp);
3373 static void addrconf_permanent_addr(struct net *net, struct net_device *dev)
3375 struct inet6_ifaddr *ifp, *tmp;
3376 struct inet6_dev *idev;
3378 idev = __in6_dev_get(dev);
3382 write_lock_bh(&idev->lock);
3384 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3385 if ((ifp->flags & IFA_F_PERMANENT) &&
3386 fixup_permanent_addr(net, idev, ifp) < 0) {
3387 write_unlock_bh(&idev->lock);
3390 write_lock_bh(&idev->lock);
3392 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3393 idev->dev->name, &ifp->addr);
3397 write_unlock_bh(&idev->lock);
3400 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3403 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3404 struct netdev_notifier_changeupper_info *info;
3405 struct inet6_dev *idev = __in6_dev_get(dev);
3406 struct net *net = dev_net(dev);
3407 int run_pending = 0;
3411 case NETDEV_REGISTER:
3412 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3413 idev = ipv6_add_dev(dev);
3415 return notifier_from_errno(PTR_ERR(idev));
3419 case NETDEV_CHANGEMTU:
3420 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3421 if (dev->mtu < IPV6_MIN_MTU) {
3422 addrconf_ifdown(dev, dev != net->loopback_dev);
3427 rt6_mtu_change(dev, dev->mtu);
3428 idev->cnf.mtu6 = dev->mtu;
3432 /* allocate new idev */
3433 idev = ipv6_add_dev(dev);
3437 /* device is still not ready */
3438 if (!(idev->if_flags & IF_READY))
3447 if (dev->flags & IFF_SLAVE)
3450 if (idev && idev->cnf.disable_ipv6)
3453 if (event == NETDEV_UP) {
3454 /* restore routes for permanent addresses */
3455 addrconf_permanent_addr(net, dev);
3457 if (!addrconf_link_ready(dev)) {
3458 /* device is not ready yet. */
3459 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3464 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3465 idev = ipv6_add_dev(dev);
3467 if (!IS_ERR_OR_NULL(idev)) {
3468 idev->if_flags |= IF_READY;
3471 } else if (event == NETDEV_CHANGE) {
3472 if (!addrconf_link_ready(dev)) {
3473 /* device is still not ready. */
3474 rt6_sync_down_dev(dev, event);
3479 if (idev->if_flags & IF_READY) {
3480 /* device is already configured -
3481 * but resend MLD reports, we might
3482 * have roamed and need to update
3483 * multicast snooping switches
3486 rt6_sync_up(dev, RTNH_F_LINKDOWN);
3489 idev->if_flags |= IF_READY;
3492 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3498 switch (dev->type) {
3499 #if IS_ENABLED(CONFIG_IPV6_SIT)
3501 addrconf_sit_config(dev);
3504 #if IS_ENABLED(CONFIG_NET_IPGRE)
3506 addrconf_gre_config(dev);
3509 case ARPHRD_LOOPBACK:
3514 addrconf_dev_config(dev);
3518 if (!IS_ERR_OR_NULL(idev)) {
3520 addrconf_dad_run(idev);
3522 /* Device has an address by now */
3523 rt6_sync_up(dev, RTNH_F_DEAD);
3526 * If the MTU changed during the interface down,
3527 * when the interface up, the changed MTU must be
3528 * reflected in the idev as well as routers.
3530 if (idev->cnf.mtu6 != dev->mtu &&
3531 dev->mtu >= IPV6_MIN_MTU) {
3532 rt6_mtu_change(dev, dev->mtu);
3533 idev->cnf.mtu6 = dev->mtu;
3535 idev->tstamp = jiffies;
3536 inet6_ifinfo_notify(RTM_NEWLINK, idev);
3539 * If the changed mtu during down is lower than
3540 * IPV6_MIN_MTU stop IPv6 on this interface.
3542 if (dev->mtu < IPV6_MIN_MTU)
3543 addrconf_ifdown(dev, dev != net->loopback_dev);
3548 case NETDEV_UNREGISTER:
3550 * Remove all addresses from this interface.
3552 addrconf_ifdown(dev, event != NETDEV_DOWN);
3555 case NETDEV_CHANGENAME:
3557 snmp6_unregister_dev(idev);
3558 addrconf_sysctl_unregister(idev);
3559 err = addrconf_sysctl_register(idev);
3561 return notifier_from_errno(err);
3562 err = snmp6_register_dev(idev);
3564 addrconf_sysctl_unregister(idev);
3565 return notifier_from_errno(err);
3570 case NETDEV_PRE_TYPE_CHANGE:
3571 case NETDEV_POST_TYPE_CHANGE:
3573 addrconf_type_change(dev, event);
3576 case NETDEV_CHANGEUPPER:
3579 /* flush all routes if dev is linked to or unlinked from
3580 * an L3 master device (e.g., VRF)
3582 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3583 addrconf_ifdown(dev, 0);
3590 * addrconf module should be notified of a device going up
3592 static struct notifier_block ipv6_dev_notf = {
3593 .notifier_call = addrconf_notify,
3594 .priority = ADDRCONF_NOTIFY_PRIORITY,
3597 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3599 struct inet6_dev *idev;
3602 idev = __in6_dev_get(dev);
3604 if (event == NETDEV_POST_TYPE_CHANGE)
3605 ipv6_mc_remap(idev);
3606 else if (event == NETDEV_PRE_TYPE_CHANGE)
3607 ipv6_mc_unmap(idev);
3610 static bool addr_is_local(const struct in6_addr *addr)
3612 return ipv6_addr_type(addr) &
3613 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3616 static int addrconf_ifdown(struct net_device *dev, int how)
3618 unsigned long event = how ? NETDEV_UNREGISTER : NETDEV_DOWN;
3619 struct net *net = dev_net(dev);
3620 struct inet6_dev *idev;
3621 struct inet6_ifaddr *ifa, *tmp;
3628 rt6_disable_ip(dev, event);
3630 idev = __in6_dev_get(dev);
3635 * Step 1: remove reference to ipv6 device from parent device.
3641 /* protected by rtnl_lock */
3642 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3644 /* Step 1.5: remove snmp6 entry */
3645 snmp6_unregister_dev(idev);
3649 /* aggregate the system setting and interface setting */
3650 _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3652 _keep_addr = idev->cnf.keep_addr_on_down;
3654 /* combine the user config with event to determine if permanent
3655 * addresses are to be removed from address hash table
3657 keep_addr = !(how || _keep_addr <= 0 || idev->cnf.disable_ipv6);
3659 /* Step 2: clear hash table */
3660 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3661 struct hlist_head *h = &inet6_addr_lst[i];
3663 spin_lock_bh(&addrconf_hash_lock);
3665 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3666 if (ifa->idev == idev) {
3667 addrconf_del_dad_work(ifa);
3668 /* combined flag + permanent flag decide if
3669 * address is retained on a down event
3672 !(ifa->flags & IFA_F_PERMANENT) ||
3673 addr_is_local(&ifa->addr)) {
3674 hlist_del_init_rcu(&ifa->addr_lst);
3679 spin_unlock_bh(&addrconf_hash_lock);
3682 write_lock_bh(&idev->lock);
3684 addrconf_del_rs_timer(idev);
3686 /* Step 2: clear flags for stateless addrconf */
3688 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3690 /* Step 3: clear tempaddr list */
3691 while (!list_empty(&idev->tempaddr_list)) {
3692 ifa = list_first_entry(&idev->tempaddr_list,
3693 struct inet6_ifaddr, tmp_list);
3694 list_del(&ifa->tmp_list);
3695 write_unlock_bh(&idev->lock);
3696 spin_lock_bh(&ifa->lock);
3699 in6_ifa_put(ifa->ifpub);
3702 spin_unlock_bh(&ifa->lock);
3704 write_lock_bh(&idev->lock);
3707 /* re-combine the user config with event to determine if permanent
3708 * addresses are to be removed from the interface list
3710 keep_addr = (!how && _keep_addr > 0 && !idev->cnf.disable_ipv6);
3712 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
3713 struct rt6_info *rt = NULL;
3716 addrconf_del_dad_work(ifa);
3718 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3719 !addr_is_local(&ifa->addr);
3721 write_unlock_bh(&idev->lock);
3722 spin_lock_bh(&ifa->lock);
3725 /* set state to skip the notifier below */
3726 state = INET6_IFADDR_STATE_DEAD;
3727 ifa->state = INET6_IFADDR_STATE_PREDAD;
3728 if (!(ifa->flags & IFA_F_NODAD))
3729 ifa->flags |= IFA_F_TENTATIVE;
3735 ifa->state = INET6_IFADDR_STATE_DEAD;
3738 spin_unlock_bh(&ifa->lock);
3741 ip6_del_rt(net, rt);
3743 if (state != INET6_IFADDR_STATE_DEAD) {
3744 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3745 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3747 if (idev->cnf.forwarding)
3748 addrconf_leave_anycast(ifa);
3749 addrconf_leave_solict(ifa->idev, &ifa->addr);
3752 write_lock_bh(&idev->lock);
3754 list_del_rcu(&ifa->if_list);
3759 write_unlock_bh(&idev->lock);
3761 /* Step 5: Discard anycast and multicast list */
3763 ipv6_ac_destroy_dev(idev);
3764 ipv6_mc_destroy_dev(idev);
3769 idev->tstamp = jiffies;
3771 /* Last: Shot the device (if unregistered) */
3773 addrconf_sysctl_unregister(idev);
3774 neigh_parms_release(&nd_tbl, idev->nd_parms);
3775 neigh_ifdown(&nd_tbl, dev);
3781 static void addrconf_rs_timer(struct timer_list *t)
3783 struct inet6_dev *idev = from_timer(idev, t, rs_timer);
3784 struct net_device *dev = idev->dev;
3785 struct in6_addr lladdr;
3787 write_lock(&idev->lock);
3788 if (idev->dead || !(idev->if_flags & IF_READY))
3791 if (!ipv6_accept_ra(idev))
3794 /* Announcement received after solicitation was sent */
3795 if (idev->if_flags & IF_RA_RCVD)
3798 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
3799 write_unlock(&idev->lock);
3800 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3801 ndisc_send_rs(dev, &lladdr,
3802 &in6addr_linklocal_allrouters);
3806 write_lock(&idev->lock);
3807 idev->rs_interval = rfc3315_s14_backoff_update(
3808 idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
3809 /* The wait after the last probe can be shorter */
3810 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3811 idev->cnf.rtr_solicits) ?
3812 idev->cnf.rtr_solicit_delay :
3816 * Note: we do not support deprecated "all on-link"
3817 * assumption any longer.
3819 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3823 write_unlock(&idev->lock);
3829 * Duplicate Address Detection
3831 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3833 unsigned long rand_num;
3834 struct inet6_dev *idev = ifp->idev;
3837 if (ifp->flags & IFA_F_OPTIMISTIC)
3840 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3843 if (idev->cnf.enhanced_dad ||
3844 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) {
3846 get_random_bytes(&nonce, 6);
3849 ifp->dad_nonce = nonce;
3850 ifp->dad_probes = idev->cnf.dad_transmits;
3851 addrconf_mod_dad_work(ifp, rand_num);
3854 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3856 struct inet6_dev *idev = ifp->idev;
3857 struct net_device *dev = idev->dev;
3858 bool bump_id, notify = false;
3861 addrconf_join_solict(dev, &ifp->addr);
3863 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3865 read_lock_bh(&idev->lock);
3866 spin_lock(&ifp->lock);
3867 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3871 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3872 (net->ipv6.devconf_all->accept_dad < 1 &&
3873 idev->cnf.accept_dad < 1) ||
3874 !(ifp->flags&IFA_F_TENTATIVE) ||
3875 ifp->flags & IFA_F_NODAD) {
3876 bool send_na = false;
3878 if (ifp->flags & IFA_F_TENTATIVE &&
3879 !(ifp->flags & IFA_F_OPTIMISTIC))
3881 bump_id = ifp->flags & IFA_F_TENTATIVE;
3882 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3883 spin_unlock(&ifp->lock);
3884 read_unlock_bh(&idev->lock);
3886 addrconf_dad_completed(ifp, bump_id, send_na);
3890 if (!(idev->if_flags & IF_READY)) {
3891 spin_unlock(&ifp->lock);
3892 read_unlock_bh(&idev->lock);
3894 * If the device is not ready:
3895 * - keep it tentative if it is a permanent address.
3896 * - otherwise, kill it.
3899 addrconf_dad_stop(ifp, 0);
3904 * Optimistic nodes can start receiving
3907 if (ifp->flags & IFA_F_OPTIMISTIC) {
3908 ip6_ins_rt(net, ifp->rt);
3909 if (ipv6_use_optimistic_addr(net, idev)) {
3910 /* Because optimistic nodes can use this address,
3911 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3917 addrconf_dad_kick(ifp);
3919 spin_unlock(&ifp->lock);
3920 read_unlock_bh(&idev->lock);
3922 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3925 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3927 bool begin_dad = false;
3929 spin_lock_bh(&ifp->lock);
3930 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3931 ifp->state = INET6_IFADDR_STATE_PREDAD;
3934 spin_unlock_bh(&ifp->lock);
3937 addrconf_mod_dad_work(ifp, 0);
3940 static void addrconf_dad_work(struct work_struct *w)
3942 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3943 struct inet6_ifaddr,
3945 struct inet6_dev *idev = ifp->idev;
3946 bool bump_id, disable_ipv6 = false;
3947 struct in6_addr mcaddr;
3953 } action = DAD_PROCESS;
3957 spin_lock_bh(&ifp->lock);
3958 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3960 ifp->state = INET6_IFADDR_STATE_DAD;
3961 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3963 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3965 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 ||
3966 idev->cnf.accept_dad > 1) &&
3967 !idev->cnf.disable_ipv6 &&
3968 !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
3969 struct in6_addr addr;
3971 addr.s6_addr32[0] = htonl(0xfe800000);
3972 addr.s6_addr32[1] = 0;
3974 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
3975 ipv6_addr_equal(&ifp->addr, &addr)) {
3976 /* DAD failed for link-local based on MAC */
3977 idev->cnf.disable_ipv6 = 1;
3979 pr_info("%s: IPv6 being disabled!\n",
3980 ifp->idev->dev->name);
3981 disable_ipv6 = true;
3985 spin_unlock_bh(&ifp->lock);
3987 if (action == DAD_BEGIN) {
3988 addrconf_dad_begin(ifp);
3990 } else if (action == DAD_ABORT) {
3992 addrconf_dad_stop(ifp, 1);
3994 addrconf_ifdown(idev->dev, 0);
3998 if (!ifp->dad_probes && addrconf_dad_end(ifp))
4001 write_lock_bh(&idev->lock);
4002 if (idev->dead || !(idev->if_flags & IF_READY)) {
4003 write_unlock_bh(&idev->lock);
4007 spin_lock(&ifp->lock);
4008 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
4009 spin_unlock(&ifp->lock);
4010 write_unlock_bh(&idev->lock);
4014 if (ifp->dad_probes == 0) {
4015 bool send_na = false;
4018 * DAD was successful
4021 if (ifp->flags & IFA_F_TENTATIVE &&
4022 !(ifp->flags & IFA_F_OPTIMISTIC))
4024 bump_id = ifp->flags & IFA_F_TENTATIVE;
4025 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
4026 spin_unlock(&ifp->lock);
4027 write_unlock_bh(&idev->lock);
4029 addrconf_dad_completed(ifp, bump_id, send_na);
4035 addrconf_mod_dad_work(ifp,
4036 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
4037 spin_unlock(&ifp->lock);
4038 write_unlock_bh(&idev->lock);
4040 /* send a neighbour solicitation for our addr */
4041 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
4042 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
4049 /* ifp->idev must be at least read locked */
4050 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
4052 struct inet6_ifaddr *ifpiter;
4053 struct inet6_dev *idev = ifp->idev;
4055 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
4056 if (ifpiter->scope > IFA_LINK)
4058 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
4059 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
4060 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
4067 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
4070 struct net_device *dev = ifp->idev->dev;
4071 struct in6_addr lladdr;
4072 bool send_rs, send_mld;
4074 addrconf_del_dad_work(ifp);
4077 * Configure the address for reception. Now it is valid.
4080 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4082 /* If added prefix is link local and we are prepared to process
4083 router advertisements, start sending router solicitations.
4086 read_lock_bh(&ifp->idev->lock);
4087 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
4088 send_rs = send_mld &&
4089 ipv6_accept_ra(ifp->idev) &&
4090 ifp->idev->cnf.rtr_solicits != 0 &&
4091 (dev->flags&IFF_LOOPBACK) == 0;
4092 read_unlock_bh(&ifp->idev->lock);
4094 /* While dad is in progress mld report's source address is in6_addrany.
4095 * Resend with proper ll now.
4098 ipv6_mc_dad_complete(ifp->idev);
4100 /* send unsolicited NA if enabled */
4102 (ifp->idev->cnf.ndisc_notify ||
4103 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) {
4104 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr,
4105 /*router=*/ !!ifp->idev->cnf.forwarding,
4106 /*solicited=*/ false, /*override=*/ true,
4112 * If a host as already performed a random delay
4113 * [...] as part of DAD [...] there is no need
4114 * to delay again before sending the first RS
4116 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
4118 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
4120 write_lock_bh(&ifp->idev->lock);
4121 spin_lock(&ifp->lock);
4122 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4123 ifp->idev->cnf.rtr_solicit_interval);
4124 ifp->idev->rs_probes = 1;
4125 ifp->idev->if_flags |= IF_RS_SENT;
4126 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
4127 spin_unlock(&ifp->lock);
4128 write_unlock_bh(&ifp->idev->lock);
4132 rt_genid_bump_ipv6(dev_net(dev));
4134 /* Make sure that a new temporary address will be created
4135 * before this temporary address becomes deprecated.
4137 if (ifp->flags & IFA_F_TEMPORARY)
4138 addrconf_verify_rtnl();
4141 static void addrconf_dad_run(struct inet6_dev *idev)
4143 struct inet6_ifaddr *ifp;
4145 read_lock_bh(&idev->lock);
4146 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4147 spin_lock(&ifp->lock);
4148 if (ifp->flags & IFA_F_TENTATIVE &&
4149 ifp->state == INET6_IFADDR_STATE_DAD)
4150 addrconf_dad_kick(ifp);
4151 spin_unlock(&ifp->lock);
4153 read_unlock_bh(&idev->lock);
4156 #ifdef CONFIG_PROC_FS
4157 struct if6_iter_state {
4158 struct seq_net_private p;
4163 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
4165 struct if6_iter_state *state = seq->private;
4166 struct net *net = seq_file_net(seq);
4167 struct inet6_ifaddr *ifa = NULL;
4170 /* initial bucket if pos is 0 */
4176 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
4177 hlist_for_each_entry_rcu(ifa, &inet6_addr_lst[state->bucket],
4179 if (!net_eq(dev_net(ifa->idev->dev), net))
4181 /* sync with offset */
4182 if (p < state->offset) {
4190 /* prepare for next bucket */
4197 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4198 struct inet6_ifaddr *ifa)
4200 struct if6_iter_state *state = seq->private;
4201 struct net *net = seq_file_net(seq);
4203 hlist_for_each_entry_continue_rcu(ifa, addr_lst) {
4204 if (!net_eq(dev_net(ifa->idev->dev), net))
4210 while (++state->bucket < IN6_ADDR_HSIZE) {
4212 hlist_for_each_entry_rcu(ifa,
4213 &inet6_addr_lst[state->bucket], addr_lst) {
4214 if (!net_eq(dev_net(ifa->idev->dev), net))
4224 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4228 return if6_get_first(seq, *pos);
4231 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4233 struct inet6_ifaddr *ifa;
4235 ifa = if6_get_next(seq, v);
4240 static void if6_seq_stop(struct seq_file *seq, void *v)
4246 static int if6_seq_show(struct seq_file *seq, void *v)
4248 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4249 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
4251 ifp->idev->dev->ifindex,
4255 ifp->idev->dev->name);
4259 static const struct seq_operations if6_seq_ops = {
4260 .start = if6_seq_start,
4261 .next = if6_seq_next,
4262 .show = if6_seq_show,
4263 .stop = if6_seq_stop,
4266 static int if6_seq_open(struct inode *inode, struct file *file)
4268 return seq_open_net(inode, file, &if6_seq_ops,
4269 sizeof(struct if6_iter_state));
4272 static const struct file_operations if6_fops = {
4273 .open = if6_seq_open,
4275 .llseek = seq_lseek,
4276 .release = seq_release_net,
4279 static int __net_init if6_proc_net_init(struct net *net)
4281 if (!proc_create("if_inet6", 0444, net->proc_net, &if6_fops))
4286 static void __net_exit if6_proc_net_exit(struct net *net)
4288 remove_proc_entry("if_inet6", net->proc_net);
4291 static struct pernet_operations if6_proc_net_ops = {
4292 .init = if6_proc_net_init,
4293 .exit = if6_proc_net_exit,
4296 int __init if6_proc_init(void)
4298 return register_pernet_subsys(&if6_proc_net_ops);
4301 void if6_proc_exit(void)
4303 unregister_pernet_subsys(&if6_proc_net_ops);
4305 #endif /* CONFIG_PROC_FS */
4307 #if IS_ENABLED(CONFIG_IPV6_MIP6)
4308 /* Check if address is a home address configured on any interface. */
4309 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
4311 unsigned int hash = inet6_addr_hash(net, addr);
4312 struct inet6_ifaddr *ifp = NULL;
4316 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
4317 if (!net_eq(dev_net(ifp->idev->dev), net))
4319 if (ipv6_addr_equal(&ifp->addr, addr) &&
4320 (ifp->flags & IFA_F_HOMEADDRESS)) {
4331 * Periodic address status verification
4334 static void addrconf_verify_rtnl(void)
4336 unsigned long now, next, next_sec, next_sched;
4337 struct inet6_ifaddr *ifp;
4344 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
4346 cancel_delayed_work(&addr_chk_work);
4348 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
4350 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
4353 /* When setting preferred_lft to a value not zero or
4354 * infinity, while valid_lft is infinity
4355 * IFA_F_PERMANENT has a non-infinity life time.
4357 if ((ifp->flags & IFA_F_PERMANENT) &&
4358 (ifp->prefered_lft == INFINITY_LIFE_TIME))
4361 spin_lock(&ifp->lock);
4362 /* We try to batch several events at once. */
4363 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
4365 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4366 age >= ifp->valid_lft) {
4367 spin_unlock(&ifp->lock);
4371 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4372 spin_unlock(&ifp->lock);
4374 } else if (age >= ifp->prefered_lft) {
4375 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
4378 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4380 ifp->flags |= IFA_F_DEPRECATED;
4383 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4384 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
4385 next = ifp->tstamp + ifp->valid_lft * HZ;
4387 spin_unlock(&ifp->lock);
4392 ipv6_ifa_notify(0, ifp);
4396 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4397 !(ifp->flags&IFA_F_TENTATIVE)) {
4398 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4399 ifp->idev->cnf.dad_transmits *
4400 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
4402 if (age >= ifp->prefered_lft - regen_advance) {
4403 struct inet6_ifaddr *ifpub = ifp->ifpub;
4404 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4405 next = ifp->tstamp + ifp->prefered_lft * HZ;
4406 if (!ifp->regen_count && ifpub) {
4409 in6_ifa_hold(ifpub);
4410 spin_unlock(&ifp->lock);
4412 spin_lock(&ifpub->lock);
4413 ifpub->regen_count = 0;
4414 spin_unlock(&ifpub->lock);
4415 rcu_read_unlock_bh();
4416 ipv6_create_tempaddr(ifpub, ifp, true);
4422 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4423 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4424 spin_unlock(&ifp->lock);
4426 /* ifp->prefered_lft <= ifp->valid_lft */
4427 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4428 next = ifp->tstamp + ifp->prefered_lft * HZ;
4429 spin_unlock(&ifp->lock);
4434 next_sec = round_jiffies_up(next);
4437 /* If rounded timeout is accurate enough, accept it. */
4438 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4439 next_sched = next_sec;
4441 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4442 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4443 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4445 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4446 now, next, next_sec, next_sched);
4447 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
4448 rcu_read_unlock_bh();
4451 static void addrconf_verify_work(struct work_struct *w)
4454 addrconf_verify_rtnl();
4458 static void addrconf_verify(void)
4460 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4463 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4464 struct in6_addr **peer_pfx)
4466 struct in6_addr *pfx = NULL;
4471 pfx = nla_data(addr);
4474 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4476 pfx = nla_data(local);
4482 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4483 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4484 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4485 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
4486 [IFA_FLAGS] = { .len = sizeof(u32) },
4490 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
4491 struct netlink_ext_ack *extack)
4493 struct net *net = sock_net(skb->sk);
4494 struct ifaddrmsg *ifm;
4495 struct nlattr *tb[IFA_MAX+1];
4496 struct in6_addr *pfx, *peer_pfx;
4500 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
4505 ifm = nlmsg_data(nlh);
4506 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4510 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4512 /* We ignore other flags so far. */
4513 ifa_flags &= IFA_F_MANAGETEMPADDR;
4515 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4516 ifm->ifa_prefixlen);
4519 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
4520 u32 prefered_lft, u32 valid_lft)
4524 unsigned long timeout;
4525 bool was_managetempaddr;
4526 bool had_prefixroute;
4530 if (!valid_lft || (prefered_lft > valid_lft))
4533 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4534 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4537 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED)
4538 ifa_flags &= ~IFA_F_OPTIMISTIC;
4540 timeout = addrconf_timeout_fixup(valid_lft, HZ);
4541 if (addrconf_finite_timeout(timeout)) {
4542 expires = jiffies_to_clock_t(timeout * HZ);
4543 valid_lft = timeout;
4544 flags = RTF_EXPIRES;
4548 ifa_flags |= IFA_F_PERMANENT;
4551 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4552 if (addrconf_finite_timeout(timeout)) {
4554 ifa_flags |= IFA_F_DEPRECATED;
4555 prefered_lft = timeout;
4558 spin_lock_bh(&ifp->lock);
4559 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4560 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4561 !(ifp->flags & IFA_F_NOPREFIXROUTE);
4562 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4563 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4564 IFA_F_NOPREFIXROUTE);
4565 ifp->flags |= ifa_flags;
4566 ifp->tstamp = jiffies;
4567 ifp->valid_lft = valid_lft;
4568 ifp->prefered_lft = prefered_lft;
4570 spin_unlock_bh(&ifp->lock);
4571 if (!(ifp->flags&IFA_F_TENTATIVE))
4572 ipv6_ifa_notify(0, ifp);
4574 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4575 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4577 } else if (had_prefixroute) {
4578 enum cleanup_prefix_rt_t action;
4579 unsigned long rt_expires;
4581 write_lock_bh(&ifp->idev->lock);
4582 action = check_cleanup_prefix_route(ifp, &rt_expires);
4583 write_unlock_bh(&ifp->idev->lock);
4585 if (action != CLEANUP_PREFIX_RT_NOP) {
4586 cleanup_prefix_route(ifp, rt_expires,
4587 action == CLEANUP_PREFIX_RT_DEL);
4591 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4592 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4593 valid_lft = prefered_lft = 0;
4594 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4595 !was_managetempaddr, jiffies);
4598 addrconf_verify_rtnl();
4604 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
4605 struct netlink_ext_ack *extack)
4607 struct net *net = sock_net(skb->sk);
4608 struct ifaddrmsg *ifm;
4609 struct nlattr *tb[IFA_MAX+1];
4610 struct in6_addr *pfx, *peer_pfx;
4611 struct inet6_ifaddr *ifa;
4612 struct net_device *dev;
4613 struct inet6_dev *idev;
4614 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
4618 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
4623 ifm = nlmsg_data(nlh);
4624 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4628 if (tb[IFA_CACHEINFO]) {
4629 struct ifa_cacheinfo *ci;
4631 ci = nla_data(tb[IFA_CACHEINFO]);
4632 valid_lft = ci->ifa_valid;
4633 preferred_lft = ci->ifa_prefered;
4635 preferred_lft = INFINITY_LIFE_TIME;
4636 valid_lft = INFINITY_LIFE_TIME;
4639 dev = __dev_get_by_index(net, ifm->ifa_index);
4643 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4645 /* We ignore other flags so far. */
4646 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4647 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC;
4649 idev = ipv6_find_idev(dev);
4651 return PTR_ERR(idev);
4653 if (!ipv6_allow_optimistic_dad(net, idev))
4654 ifa_flags &= ~IFA_F_OPTIMISTIC;
4656 if (ifa_flags & IFA_F_NODAD && ifa_flags & IFA_F_OPTIMISTIC) {
4657 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive");
4661 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
4664 * It would be best to check for !NLM_F_CREATE here but
4665 * userspace already relies on not having to provide this.
4667 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
4668 ifm->ifa_prefixlen, ifa_flags,
4669 preferred_lft, valid_lft, extack);
4672 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4673 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4676 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
4683 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4684 u8 scope, int ifindex)
4686 struct ifaddrmsg *ifm;
4688 ifm = nlmsg_data(nlh);
4689 ifm->ifa_family = AF_INET6;
4690 ifm->ifa_prefixlen = prefixlen;
4691 ifm->ifa_flags = flags;
4692 ifm->ifa_scope = scope;
4693 ifm->ifa_index = ifindex;
4696 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4697 unsigned long tstamp, u32 preferred, u32 valid)
4699 struct ifa_cacheinfo ci;
4701 ci.cstamp = cstamp_delta(cstamp);
4702 ci.tstamp = cstamp_delta(tstamp);
4703 ci.ifa_prefered = preferred;
4704 ci.ifa_valid = valid;
4706 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4709 static inline int rt_scope(int ifa_scope)
4711 if (ifa_scope & IFA_HOST)
4712 return RT_SCOPE_HOST;
4713 else if (ifa_scope & IFA_LINK)
4714 return RT_SCOPE_LINK;
4715 else if (ifa_scope & IFA_SITE)
4716 return RT_SCOPE_SITE;
4718 return RT_SCOPE_UNIVERSE;
4721 static inline int inet6_ifaddr_msgsize(void)
4723 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4724 + nla_total_size(16) /* IFA_LOCAL */
4725 + nla_total_size(16) /* IFA_ADDRESS */
4726 + nla_total_size(sizeof(struct ifa_cacheinfo))
4727 + nla_total_size(4) /* IFA_FLAGS */;
4730 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
4731 u32 portid, u32 seq, int event, unsigned int flags)
4733 struct nlmsghdr *nlh;
4734 u32 preferred, valid;
4736 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4740 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4741 ifa->idev->dev->ifindex);
4743 if (!((ifa->flags&IFA_F_PERMANENT) &&
4744 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
4745 preferred = ifa->prefered_lft;
4746 valid = ifa->valid_lft;
4747 if (preferred != INFINITY_LIFE_TIME) {
4748 long tval = (jiffies - ifa->tstamp)/HZ;
4749 if (preferred > tval)
4753 if (valid != INFINITY_LIFE_TIME) {
4761 preferred = INFINITY_LIFE_TIME;
4762 valid = INFINITY_LIFE_TIME;
4765 if (!ipv6_addr_any(&ifa->peer_addr)) {
4766 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4767 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
4770 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
4773 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4776 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4779 nlmsg_end(skb, nlh);
4783 nlmsg_cancel(skb, nlh);
4787 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
4788 u32 portid, u32 seq, int event, u16 flags)
4790 struct nlmsghdr *nlh;
4791 u8 scope = RT_SCOPE_UNIVERSE;
4792 int ifindex = ifmca->idev->dev->ifindex;
4794 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4795 scope = RT_SCOPE_SITE;
4797 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4801 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4802 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
4803 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
4804 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4805 nlmsg_cancel(skb, nlh);
4809 nlmsg_end(skb, nlh);
4813 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
4814 u32 portid, u32 seq, int event, unsigned int flags)
4816 struct nlmsghdr *nlh;
4817 u8 scope = RT_SCOPE_UNIVERSE;
4818 int ifindex = ifaca->aca_idev->dev->ifindex;
4820 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4821 scope = RT_SCOPE_SITE;
4823 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4827 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4828 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
4829 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
4830 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4831 nlmsg_cancel(skb, nlh);
4835 nlmsg_end(skb, nlh);
4845 /* called with rcu_read_lock() */
4846 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4847 struct netlink_callback *cb, enum addr_type_t type,
4848 int s_ip_idx, int *p_ip_idx)
4850 struct ifmcaddr6 *ifmca;
4851 struct ifacaddr6 *ifaca;
4853 int ip_idx = *p_ip_idx;
4855 read_lock_bh(&idev->lock);
4857 case UNICAST_ADDR: {
4858 struct inet6_ifaddr *ifa;
4860 /* unicast address incl. temp addr */
4861 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4862 if (++ip_idx < s_ip_idx)
4864 err = inet6_fill_ifaddr(skb, ifa,
4865 NETLINK_CB(cb->skb).portid,
4871 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4875 case MULTICAST_ADDR:
4876 /* multicast address */
4877 for (ifmca = idev->mc_list; ifmca;
4878 ifmca = ifmca->next, ip_idx++) {
4879 if (ip_idx < s_ip_idx)
4881 err = inet6_fill_ifmcaddr(skb, ifmca,
4882 NETLINK_CB(cb->skb).portid,
4891 /* anycast address */
4892 for (ifaca = idev->ac_list; ifaca;
4893 ifaca = ifaca->aca_next, ip_idx++) {
4894 if (ip_idx < s_ip_idx)
4896 err = inet6_fill_ifacaddr(skb, ifaca,
4897 NETLINK_CB(cb->skb).portid,
4908 read_unlock_bh(&idev->lock);
4913 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4914 enum addr_type_t type)
4916 struct net *net = sock_net(skb->sk);
4919 int s_idx, s_ip_idx;
4920 struct net_device *dev;
4921 struct inet6_dev *idev;
4922 struct hlist_head *head;
4925 s_idx = idx = cb->args[1];
4926 s_ip_idx = ip_idx = cb->args[2];
4929 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4930 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4932 head = &net->dev_index_head[h];
4933 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4936 if (h > s_h || idx > s_idx)
4939 idev = __in6_dev_get(dev);
4943 if (in6_dump_addrs(idev, skb, cb, type,
4944 s_ip_idx, &ip_idx) < 0)
4954 cb->args[2] = ip_idx;
4959 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4961 enum addr_type_t type = UNICAST_ADDR;
4963 return inet6_dump_addr(skb, cb, type);
4966 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4968 enum addr_type_t type = MULTICAST_ADDR;
4970 return inet6_dump_addr(skb, cb, type);
4974 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4976 enum addr_type_t type = ANYCAST_ADDR;
4978 return inet6_dump_addr(skb, cb, type);
4981 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
4982 struct netlink_ext_ack *extack)
4984 struct net *net = sock_net(in_skb->sk);
4985 struct ifaddrmsg *ifm;
4986 struct nlattr *tb[IFA_MAX+1];
4987 struct in6_addr *addr = NULL, *peer;
4988 struct net_device *dev = NULL;
4989 struct inet6_ifaddr *ifa;
4990 struct sk_buff *skb;
4993 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
4998 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
5002 ifm = nlmsg_data(nlh);
5004 dev = dev_get_by_index(net, ifm->ifa_index);
5006 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
5008 err = -EADDRNOTAVAIL;
5012 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
5018 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
5019 nlh->nlmsg_seq, RTM_NEWADDR, 0);
5021 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5022 WARN_ON(err == -EMSGSIZE);
5026 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
5035 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
5037 struct sk_buff *skb;
5038 struct net *net = dev_net(ifa->idev->dev);
5041 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5045 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
5047 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5048 WARN_ON(err == -EMSGSIZE);
5052 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
5056 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
5059 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
5060 __s32 *array, int bytes)
5062 BUG_ON(bytes < (DEVCONF_MAX * 4));
5064 memset(array, 0, bytes);
5065 array[DEVCONF_FORWARDING] = cnf->forwarding;
5066 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
5067 array[DEVCONF_MTU6] = cnf->mtu6;
5068 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
5069 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
5070 array[DEVCONF_AUTOCONF] = cnf->autoconf;
5071 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
5072 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
5073 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
5074 jiffies_to_msecs(cnf->rtr_solicit_interval);
5075 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
5076 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
5077 array[DEVCONF_RTR_SOLICIT_DELAY] =
5078 jiffies_to_msecs(cnf->rtr_solicit_delay);
5079 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
5080 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
5081 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
5082 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
5083 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
5084 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
5085 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
5086 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
5087 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
5088 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
5089 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
5090 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
5091 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
5092 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
5093 #ifdef CONFIG_IPV6_ROUTER_PREF
5094 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
5095 array[DEVCONF_RTR_PROBE_INTERVAL] =
5096 jiffies_to_msecs(cnf->rtr_probe_interval);
5097 #ifdef CONFIG_IPV6_ROUTE_INFO
5098 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen;
5099 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
5102 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
5103 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
5104 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5105 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
5106 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
5108 #ifdef CONFIG_IPV6_MROUTE
5109 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
5111 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
5112 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
5113 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5114 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
5115 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
5116 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
5117 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
5118 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
5119 /* we omit DEVCONF_STABLE_SECRET for now */
5120 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
5121 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
5122 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
5123 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
5124 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled;
5125 #ifdef CONFIG_IPV6_SEG6_HMAC
5126 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac;
5128 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad;
5129 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode;
5130 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy;
5131 array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass;
5134 static inline size_t inet6_ifla6_size(void)
5136 return nla_total_size(4) /* IFLA_INET6_FLAGS */
5137 + nla_total_size(sizeof(struct ifla_cacheinfo))
5138 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5139 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
5140 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
5141 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
5144 static inline size_t inet6_if_nlmsg_size(void)
5146 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5147 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5148 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5149 + nla_total_size(4) /* IFLA_MTU */
5150 + nla_total_size(4) /* IFLA_LINK */
5151 + nla_total_size(1) /* IFLA_OPERSTATE */
5152 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
5155 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
5159 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
5162 /* Use put_unaligned() because stats may not be aligned for u64. */
5163 put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5164 for (i = 1; i < ICMP6_MIB_MAX; i++)
5165 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
5167 memset(&stats[ICMP6_MIB_MAX], 0, pad);
5170 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
5171 int bytes, size_t syncpoff)
5174 u64 buff[IPSTATS_MIB_MAX];
5175 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5179 memset(buff, 0, sizeof(buff));
5180 buff[0] = IPSTATS_MIB_MAX;
5182 for_each_possible_cpu(c) {
5183 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5184 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5187 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5188 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
5191 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5195 case IFLA_INET6_STATS:
5196 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5197 offsetof(struct ipstats_mib, syncp));
5199 case IFLA_INET6_ICMP6STATS:
5200 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
5205 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5206 u32 ext_filter_mask)
5209 struct ifla_cacheinfo ci;
5211 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5212 goto nla_put_failure;
5213 ci.max_reasm_len = IPV6_MAXPLEN;
5214 ci.tstamp = cstamp_delta(idev->tstamp);
5215 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
5216 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
5217 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5218 goto nla_put_failure;
5219 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
5221 goto nla_put_failure;
5222 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5224 /* XXX - MC not implemented */
5226 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5229 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
5231 goto nla_put_failure;
5232 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5234 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
5236 goto nla_put_failure;
5237 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5239 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
5241 goto nla_put_failure;
5243 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode))
5244 goto nla_put_failure;
5246 read_lock_bh(&idev->lock);
5247 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5248 read_unlock_bh(&idev->lock);
5256 static size_t inet6_get_link_af_size(const struct net_device *dev,
5257 u32 ext_filter_mask)
5259 if (!__in6_dev_get(dev))
5262 return inet6_ifla6_size();
5265 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5266 u32 ext_filter_mask)
5268 struct inet6_dev *idev = __in6_dev_get(dev);
5273 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
5279 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
5281 struct inet6_ifaddr *ifp;
5282 struct net_device *dev = idev->dev;
5283 bool clear_token, update_rs = false;
5284 struct in6_addr ll_addr;
5290 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5292 if (!ipv6_accept_ra(idev))
5294 if (idev->cnf.rtr_solicits == 0)
5297 write_lock_bh(&idev->lock);
5299 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5300 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5302 write_unlock_bh(&idev->lock);
5304 clear_token = ipv6_addr_any(token);
5308 if (!idev->dead && (idev->if_flags & IF_READY) &&
5309 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5310 IFA_F_OPTIMISTIC)) {
5311 /* If we're not ready, then normal ifup will take care
5312 * of this. Otherwise, we need to request our rs here.
5314 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5319 write_lock_bh(&idev->lock);
5322 idev->if_flags |= IF_RS_SENT;
5323 idev->rs_interval = rfc3315_s14_backoff_init(
5324 idev->cnf.rtr_solicit_interval);
5325 idev->rs_probes = 1;
5326 addrconf_mod_rs_timer(idev, idev->rs_interval);
5329 /* Well, that's kinda nasty ... */
5330 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5331 spin_lock(&ifp->lock);
5332 if (ifp->tokenized) {
5334 ifp->prefered_lft = 0;
5336 spin_unlock(&ifp->lock);
5339 write_unlock_bh(&idev->lock);
5340 inet6_ifinfo_notify(RTM_NEWLINK, idev);
5341 addrconf_verify_rtnl();
5345 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5346 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5347 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5350 static int inet6_validate_link_af(const struct net_device *dev,
5351 const struct nlattr *nla)
5353 struct nlattr *tb[IFLA_INET6_MAX + 1];
5355 if (dev && !__in6_dev_get(dev))
5356 return -EAFNOSUPPORT;
5358 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy,
5362 static int check_addr_gen_mode(int mode)
5364 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5365 mode != IN6_ADDR_GEN_MODE_NONE &&
5366 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5367 mode != IN6_ADDR_GEN_MODE_RANDOM)
5372 static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5375 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5376 !idev->cnf.stable_secret.initialized &&
5377 !net->ipv6.devconf_dflt->stable_secret.initialized)
5382 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5385 struct inet6_dev *idev = __in6_dev_get(dev);
5386 struct nlattr *tb[IFLA_INET6_MAX + 1];
5389 return -EAFNOSUPPORT;
5391 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0)
5394 if (tb[IFLA_INET6_TOKEN]) {
5395 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
5400 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5401 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5403 if (check_addr_gen_mode(mode) < 0 ||
5404 check_stable_privacy(idev, dev_net(dev), mode) < 0)
5407 idev->cnf.addr_gen_mode = mode;
5414 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
5415 u32 portid, u32 seq, int event, unsigned int flags)
5417 struct net_device *dev = idev->dev;
5418 struct ifinfomsg *hdr;
5419 struct nlmsghdr *nlh;
5422 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
5426 hdr = nlmsg_data(nlh);
5427 hdr->ifi_family = AF_INET6;
5429 hdr->ifi_type = dev->type;
5430 hdr->ifi_index = dev->ifindex;
5431 hdr->ifi_flags = dev_get_flags(dev);
5432 hdr->ifi_change = 0;
5434 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5436 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5437 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
5438 (dev->ifindex != dev_get_iflink(dev) &&
5439 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5440 nla_put_u8(skb, IFLA_OPERSTATE,
5441 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
5442 goto nla_put_failure;
5443 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
5445 goto nla_put_failure;
5447 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
5448 goto nla_put_failure;
5450 nla_nest_end(skb, protoinfo);
5451 nlmsg_end(skb, nlh);
5455 nlmsg_cancel(skb, nlh);
5459 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5461 struct net *net = sock_net(skb->sk);
5464 struct net_device *dev;
5465 struct inet6_dev *idev;
5466 struct hlist_head *head;
5469 s_idx = cb->args[1];
5472 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5474 head = &net->dev_index_head[h];
5475 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5478 idev = __in6_dev_get(dev);
5481 if (inet6_fill_ifinfo(skb, idev,
5482 NETLINK_CB(cb->skb).portid,
5484 RTM_NEWLINK, NLM_F_MULTI) < 0)
5498 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5500 struct sk_buff *skb;
5501 struct net *net = dev_net(idev->dev);
5504 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
5508 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
5510 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5511 WARN_ON(err == -EMSGSIZE);
5515 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
5519 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
5522 static inline size_t inet6_prefix_nlmsg_size(void)
5524 return NLMSG_ALIGN(sizeof(struct prefixmsg))
5525 + nla_total_size(sizeof(struct in6_addr))
5526 + nla_total_size(sizeof(struct prefix_cacheinfo));
5529 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
5530 struct prefix_info *pinfo, u32 portid, u32 seq,
5531 int event, unsigned int flags)
5533 struct prefixmsg *pmsg;
5534 struct nlmsghdr *nlh;
5535 struct prefix_cacheinfo ci;
5537 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
5541 pmsg = nlmsg_data(nlh);
5542 pmsg->prefix_family = AF_INET6;
5543 pmsg->prefix_pad1 = 0;
5544 pmsg->prefix_pad2 = 0;
5545 pmsg->prefix_ifindex = idev->dev->ifindex;
5546 pmsg->prefix_len = pinfo->prefix_len;
5547 pmsg->prefix_type = pinfo->type;
5548 pmsg->prefix_pad3 = 0;
5549 pmsg->prefix_flags = 0;
5551 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5552 if (pinfo->autoconf)
5553 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5555 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5556 goto nla_put_failure;
5557 ci.preferred_time = ntohl(pinfo->prefered);
5558 ci.valid_time = ntohl(pinfo->valid);
5559 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5560 goto nla_put_failure;
5561 nlmsg_end(skb, nlh);
5565 nlmsg_cancel(skb, nlh);
5569 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
5570 struct prefix_info *pinfo)
5572 struct sk_buff *skb;
5573 struct net *net = dev_net(idev->dev);
5576 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
5580 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
5582 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5583 WARN_ON(err == -EMSGSIZE);
5587 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5591 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
5594 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5596 struct net *net = dev_net(ifp->idev->dev);
5601 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5606 * If the address was optimistic
5607 * we inserted the route at the start of
5608 * our DAD process, so we don't need
5611 if (!rcu_access_pointer(ifp->rt->rt6i_node))
5612 ip6_ins_rt(net, ifp->rt);
5613 if (ifp->idev->cnf.forwarding)
5614 addrconf_join_anycast(ifp);
5615 if (!ipv6_addr_any(&ifp->peer_addr))
5616 addrconf_prefix_route(&ifp->peer_addr, 128,
5617 ifp->idev->dev, 0, 0);
5620 if (ifp->idev->cnf.forwarding)
5621 addrconf_leave_anycast(ifp);
5622 addrconf_leave_solict(ifp->idev, &ifp->addr);
5623 if (!ipv6_addr_any(&ifp->peer_addr)) {
5624 struct rt6_info *rt;
5626 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5627 ifp->idev->dev, 0, 0);
5629 ip6_del_rt(net, rt);
5632 if (dst_hold_safe(&ifp->rt->dst))
5633 ip6_del_rt(net, ifp->rt);
5635 rt_genid_bump_ipv6(net);
5638 atomic_inc(&net->ipv6.dev_addr_genid);
5641 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5644 if (likely(ifp->idev->dead == 0))
5645 __ipv6_ifa_notify(event, ifp);
5646 rcu_read_unlock_bh();
5649 #ifdef CONFIG_SYSCTL
5652 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
5653 void __user *buffer, size_t *lenp, loff_t *ppos)
5655 int *valp = ctl->data;
5658 struct ctl_table lctl;
5662 * ctl->data points to idev->cnf.forwarding, we should
5663 * not modify it until we get the rtnl lock.
5668 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5671 ret = addrconf_fixup_forwarding(ctl, valp, val);
5678 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5679 void __user *buffer, size_t *lenp, loff_t *ppos)
5681 struct inet6_dev *idev = ctl->extra1;
5682 int min_mtu = IPV6_MIN_MTU;
5683 struct ctl_table lctl;
5686 lctl.extra1 = &min_mtu;
5687 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5689 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5692 static void dev_disable_change(struct inet6_dev *idev)
5694 struct netdev_notifier_info info;
5696 if (!idev || !idev->dev)
5699 netdev_notifier_info_init(&info, idev->dev);
5700 if (idev->cnf.disable_ipv6)
5701 addrconf_notify(NULL, NETDEV_DOWN, &info);
5703 addrconf_notify(NULL, NETDEV_UP, &info);
5706 static void addrconf_disable_change(struct net *net, __s32 newf)
5708 struct net_device *dev;
5709 struct inet6_dev *idev;
5711 for_each_netdev(net, dev) {
5712 idev = __in6_dev_get(dev);
5714 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5715 idev->cnf.disable_ipv6 = newf;
5717 dev_disable_change(idev);
5722 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
5727 if (!rtnl_trylock())
5728 return restart_syscall();
5730 net = (struct net *)table->extra2;
5734 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5739 if (p == &net->ipv6.devconf_all->disable_ipv6) {
5740 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5741 addrconf_disable_change(net, newf);
5742 } else if ((!newf) ^ (!old))
5743 dev_disable_change((struct inet6_dev *)table->extra1);
5750 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
5751 void __user *buffer, size_t *lenp, loff_t *ppos)
5753 int *valp = ctl->data;
5756 struct ctl_table lctl;
5760 * ctl->data points to idev->cnf.disable_ipv6, we should
5761 * not modify it until we get the rtnl lock.
5766 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5769 ret = addrconf_disable_ipv6(ctl, valp, val);
5776 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5777 void __user *buffer, size_t *lenp, loff_t *ppos)
5779 int *valp = ctl->data;
5784 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5787 if (write && old != new) {
5788 struct net *net = ctl->extra2;
5790 if (!rtnl_trylock())
5791 return restart_syscall();
5793 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5794 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5795 NETCONFA_PROXY_NEIGH,
5796 NETCONFA_IFINDEX_DEFAULT,
5797 net->ipv6.devconf_dflt);
5798 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5799 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5800 NETCONFA_PROXY_NEIGH,
5801 NETCONFA_IFINDEX_ALL,
5802 net->ipv6.devconf_all);
5804 struct inet6_dev *idev = ctl->extra1;
5806 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5807 NETCONFA_PROXY_NEIGH,
5817 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
5818 void __user *buffer, size_t *lenp,
5823 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
5824 struct net *net = (struct net *)ctl->extra2;
5826 if (!rtnl_trylock())
5827 return restart_syscall();
5829 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5832 new_val = *((int *)ctl->data);
5834 if (check_addr_gen_mode(new_val) < 0) {
5839 /* request for default */
5840 if (&net->ipv6.devconf_dflt->addr_gen_mode == ctl->data) {
5841 ipv6_devconf_dflt.addr_gen_mode = new_val;
5843 /* request for individual net device */
5848 if (check_stable_privacy(idev, net, new_val) < 0) {
5853 if (idev->cnf.addr_gen_mode != new_val) {
5854 idev->cnf.addr_gen_mode = new_val;
5855 addrconf_dev_config(idev->dev);
5866 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5867 void __user *buffer, size_t *lenp,
5871 struct in6_addr addr;
5872 char str[IPV6_MAX_STRLEN];
5873 struct ctl_table lctl = *ctl;
5874 struct net *net = ctl->extra2;
5875 struct ipv6_stable_secret *secret = ctl->data;
5877 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5880 lctl.maxlen = IPV6_MAX_STRLEN;
5883 if (!rtnl_trylock())
5884 return restart_syscall();
5886 if (!write && !secret->initialized) {
5891 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
5892 if (err >= sizeof(str)) {
5897 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5901 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5906 secret->initialized = true;
5907 secret->secret = addr;
5909 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5910 struct net_device *dev;
5912 for_each_netdev(net, dev) {
5913 struct inet6_dev *idev = __in6_dev_get(dev);
5916 idev->cnf.addr_gen_mode =
5917 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5921 struct inet6_dev *idev = ctl->extra1;
5923 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5933 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
5935 void __user *buffer,
5939 int *valp = ctl->data;
5942 struct ctl_table lctl;
5945 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
5946 * we should not modify it until we get the rtnl lock.
5951 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5954 ret = addrconf_fixup_linkdown(ctl, valp, val);
5961 void addrconf_set_nopolicy(struct rt6_info *rt, int action)
5965 rt->dst.flags |= DST_NOPOLICY;
5967 rt->dst.flags &= ~DST_NOPOLICY;
5972 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
5974 struct inet6_ifaddr *ifa;
5976 read_lock_bh(&idev->lock);
5977 list_for_each_entry(ifa, &idev->addr_list, if_list) {
5978 spin_lock(&ifa->lock);
5980 struct rt6_info *rt = ifa->rt;
5984 addrconf_set_nopolicy(ifa->rt, val);
5985 if (rt->rt6i_pcpu) {
5986 for_each_possible_cpu(cpu) {
5987 struct rt6_info **rtp;
5989 rtp = per_cpu_ptr(rt->rt6i_pcpu, cpu);
5990 addrconf_set_nopolicy(*rtp, val);
5995 spin_unlock(&ifa->lock);
5997 read_unlock_bh(&idev->lock);
6001 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val)
6003 struct inet6_dev *idev;
6006 if (!rtnl_trylock())
6007 return restart_syscall();
6011 net = (struct net *)ctl->extra2;
6012 if (valp == &net->ipv6.devconf_dflt->disable_policy) {
6017 if (valp == &net->ipv6.devconf_all->disable_policy) {
6018 struct net_device *dev;
6020 for_each_netdev(net, dev) {
6021 idev = __in6_dev_get(dev);
6023 addrconf_disable_policy_idev(idev, val);
6026 idev = (struct inet6_dev *)ctl->extra1;
6027 addrconf_disable_policy_idev(idev, val);
6035 int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write,
6036 void __user *buffer, size_t *lenp,
6039 int *valp = ctl->data;
6042 struct ctl_table lctl;
6047 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6049 if (write && (*valp != val))
6050 ret = addrconf_disable_policy(ctl, valp, val);
6058 static int minus_one = -1;
6059 static const int zero = 0;
6060 static const int one = 1;
6061 static const int two_five_five = 255;
6063 static const struct ctl_table addrconf_sysctl[] = {
6065 .procname = "forwarding",
6066 .data = &ipv6_devconf.forwarding,
6067 .maxlen = sizeof(int),
6069 .proc_handler = addrconf_sysctl_forward,
6072 .procname = "hop_limit",
6073 .data = &ipv6_devconf.hop_limit,
6074 .maxlen = sizeof(int),
6076 .proc_handler = proc_dointvec_minmax,
6077 .extra1 = (void *)&one,
6078 .extra2 = (void *)&two_five_five,
6082 .data = &ipv6_devconf.mtu6,
6083 .maxlen = sizeof(int),
6085 .proc_handler = addrconf_sysctl_mtu,
6088 .procname = "accept_ra",
6089 .data = &ipv6_devconf.accept_ra,
6090 .maxlen = sizeof(int),
6092 .proc_handler = proc_dointvec,
6095 .procname = "accept_redirects",
6096 .data = &ipv6_devconf.accept_redirects,
6097 .maxlen = sizeof(int),
6099 .proc_handler = proc_dointvec,
6102 .procname = "autoconf",
6103 .data = &ipv6_devconf.autoconf,
6104 .maxlen = sizeof(int),
6106 .proc_handler = proc_dointvec,
6109 .procname = "dad_transmits",
6110 .data = &ipv6_devconf.dad_transmits,
6111 .maxlen = sizeof(int),
6113 .proc_handler = proc_dointvec,
6116 .procname = "router_solicitations",
6117 .data = &ipv6_devconf.rtr_solicits,
6118 .maxlen = sizeof(int),
6120 .proc_handler = proc_dointvec_minmax,
6121 .extra1 = &minus_one,
6124 .procname = "router_solicitation_interval",
6125 .data = &ipv6_devconf.rtr_solicit_interval,
6126 .maxlen = sizeof(int),
6128 .proc_handler = proc_dointvec_jiffies,
6131 .procname = "router_solicitation_max_interval",
6132 .data = &ipv6_devconf.rtr_solicit_max_interval,
6133 .maxlen = sizeof(int),
6135 .proc_handler = proc_dointvec_jiffies,
6138 .procname = "router_solicitation_delay",
6139 .data = &ipv6_devconf.rtr_solicit_delay,
6140 .maxlen = sizeof(int),
6142 .proc_handler = proc_dointvec_jiffies,
6145 .procname = "force_mld_version",
6146 .data = &ipv6_devconf.force_mld_version,
6147 .maxlen = sizeof(int),
6149 .proc_handler = proc_dointvec,
6152 .procname = "mldv1_unsolicited_report_interval",
6154 &ipv6_devconf.mldv1_unsolicited_report_interval,
6155 .maxlen = sizeof(int),
6157 .proc_handler = proc_dointvec_ms_jiffies,
6160 .procname = "mldv2_unsolicited_report_interval",
6162 &ipv6_devconf.mldv2_unsolicited_report_interval,
6163 .maxlen = sizeof(int),
6165 .proc_handler = proc_dointvec_ms_jiffies,
6168 .procname = "use_tempaddr",
6169 .data = &ipv6_devconf.use_tempaddr,
6170 .maxlen = sizeof(int),
6172 .proc_handler = proc_dointvec,
6175 .procname = "temp_valid_lft",
6176 .data = &ipv6_devconf.temp_valid_lft,
6177 .maxlen = sizeof(int),
6179 .proc_handler = proc_dointvec,
6182 .procname = "temp_prefered_lft",
6183 .data = &ipv6_devconf.temp_prefered_lft,
6184 .maxlen = sizeof(int),
6186 .proc_handler = proc_dointvec,
6189 .procname = "regen_max_retry",
6190 .data = &ipv6_devconf.regen_max_retry,
6191 .maxlen = sizeof(int),
6193 .proc_handler = proc_dointvec,
6196 .procname = "max_desync_factor",
6197 .data = &ipv6_devconf.max_desync_factor,
6198 .maxlen = sizeof(int),
6200 .proc_handler = proc_dointvec,
6203 .procname = "max_addresses",
6204 .data = &ipv6_devconf.max_addresses,
6205 .maxlen = sizeof(int),
6207 .proc_handler = proc_dointvec,
6210 .procname = "accept_ra_defrtr",
6211 .data = &ipv6_devconf.accept_ra_defrtr,
6212 .maxlen = sizeof(int),
6214 .proc_handler = proc_dointvec,
6217 .procname = "accept_ra_min_hop_limit",
6218 .data = &ipv6_devconf.accept_ra_min_hop_limit,
6219 .maxlen = sizeof(int),
6221 .proc_handler = proc_dointvec,
6224 .procname = "accept_ra_pinfo",
6225 .data = &ipv6_devconf.accept_ra_pinfo,
6226 .maxlen = sizeof(int),
6228 .proc_handler = proc_dointvec,
6230 #ifdef CONFIG_IPV6_ROUTER_PREF
6232 .procname = "accept_ra_rtr_pref",
6233 .data = &ipv6_devconf.accept_ra_rtr_pref,
6234 .maxlen = sizeof(int),
6236 .proc_handler = proc_dointvec,
6239 .procname = "router_probe_interval",
6240 .data = &ipv6_devconf.rtr_probe_interval,
6241 .maxlen = sizeof(int),
6243 .proc_handler = proc_dointvec_jiffies,
6245 #ifdef CONFIG_IPV6_ROUTE_INFO
6247 .procname = "accept_ra_rt_info_min_plen",
6248 .data = &ipv6_devconf.accept_ra_rt_info_min_plen,
6249 .maxlen = sizeof(int),
6251 .proc_handler = proc_dointvec,
6254 .procname = "accept_ra_rt_info_max_plen",
6255 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
6256 .maxlen = sizeof(int),
6258 .proc_handler = proc_dointvec,
6263 .procname = "proxy_ndp",
6264 .data = &ipv6_devconf.proxy_ndp,
6265 .maxlen = sizeof(int),
6267 .proc_handler = addrconf_sysctl_proxy_ndp,
6270 .procname = "accept_source_route",
6271 .data = &ipv6_devconf.accept_source_route,
6272 .maxlen = sizeof(int),
6274 .proc_handler = proc_dointvec,
6276 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
6278 .procname = "optimistic_dad",
6279 .data = &ipv6_devconf.optimistic_dad,
6280 .maxlen = sizeof(int),
6282 .proc_handler = proc_dointvec,
6285 .procname = "use_optimistic",
6286 .data = &ipv6_devconf.use_optimistic,
6287 .maxlen = sizeof(int),
6289 .proc_handler = proc_dointvec,
6292 #ifdef CONFIG_IPV6_MROUTE
6294 .procname = "mc_forwarding",
6295 .data = &ipv6_devconf.mc_forwarding,
6296 .maxlen = sizeof(int),
6298 .proc_handler = proc_dointvec,
6302 .procname = "disable_ipv6",
6303 .data = &ipv6_devconf.disable_ipv6,
6304 .maxlen = sizeof(int),
6306 .proc_handler = addrconf_sysctl_disable,
6309 .procname = "accept_dad",
6310 .data = &ipv6_devconf.accept_dad,
6311 .maxlen = sizeof(int),
6313 .proc_handler = proc_dointvec,
6316 .procname = "force_tllao",
6317 .data = &ipv6_devconf.force_tllao,
6318 .maxlen = sizeof(int),
6320 .proc_handler = proc_dointvec
6323 .procname = "ndisc_notify",
6324 .data = &ipv6_devconf.ndisc_notify,
6325 .maxlen = sizeof(int),
6327 .proc_handler = proc_dointvec
6330 .procname = "suppress_frag_ndisc",
6331 .data = &ipv6_devconf.suppress_frag_ndisc,
6332 .maxlen = sizeof(int),
6334 .proc_handler = proc_dointvec
6337 .procname = "accept_ra_from_local",
6338 .data = &ipv6_devconf.accept_ra_from_local,
6339 .maxlen = sizeof(int),
6341 .proc_handler = proc_dointvec,
6344 .procname = "accept_ra_mtu",
6345 .data = &ipv6_devconf.accept_ra_mtu,
6346 .maxlen = sizeof(int),
6348 .proc_handler = proc_dointvec,
6351 .procname = "stable_secret",
6352 .data = &ipv6_devconf.stable_secret,
6353 .maxlen = IPV6_MAX_STRLEN,
6355 .proc_handler = addrconf_sysctl_stable_secret,
6358 .procname = "use_oif_addrs_only",
6359 .data = &ipv6_devconf.use_oif_addrs_only,
6360 .maxlen = sizeof(int),
6362 .proc_handler = proc_dointvec,
6365 .procname = "ignore_routes_with_linkdown",
6366 .data = &ipv6_devconf.ignore_routes_with_linkdown,
6367 .maxlen = sizeof(int),
6369 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
6372 .procname = "drop_unicast_in_l2_multicast",
6373 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
6374 .maxlen = sizeof(int),
6376 .proc_handler = proc_dointvec,
6379 .procname = "drop_unsolicited_na",
6380 .data = &ipv6_devconf.drop_unsolicited_na,
6381 .maxlen = sizeof(int),
6383 .proc_handler = proc_dointvec,
6386 .procname = "keep_addr_on_down",
6387 .data = &ipv6_devconf.keep_addr_on_down,
6388 .maxlen = sizeof(int),
6390 .proc_handler = proc_dointvec,
6394 .procname = "seg6_enabled",
6395 .data = &ipv6_devconf.seg6_enabled,
6396 .maxlen = sizeof(int),
6398 .proc_handler = proc_dointvec,
6400 #ifdef CONFIG_IPV6_SEG6_HMAC
6402 .procname = "seg6_require_hmac",
6403 .data = &ipv6_devconf.seg6_require_hmac,
6404 .maxlen = sizeof(int),
6406 .proc_handler = proc_dointvec,
6410 .procname = "enhanced_dad",
6411 .data = &ipv6_devconf.enhanced_dad,
6412 .maxlen = sizeof(int),
6414 .proc_handler = proc_dointvec,
6417 .procname = "addr_gen_mode",
6418 .data = &ipv6_devconf.addr_gen_mode,
6419 .maxlen = sizeof(int),
6421 .proc_handler = addrconf_sysctl_addr_gen_mode,
6424 .procname = "disable_policy",
6425 .data = &ipv6_devconf.disable_policy,
6426 .maxlen = sizeof(int),
6428 .proc_handler = addrconf_sysctl_disable_policy,
6431 .procname = "ndisc_tclass",
6432 .data = &ipv6_devconf.ndisc_tclass,
6433 .maxlen = sizeof(int),
6435 .proc_handler = proc_dointvec_minmax,
6436 .extra1 = (void *)&zero,
6437 .extra2 = (void *)&two_five_five,
6444 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
6445 struct inet6_dev *idev, struct ipv6_devconf *p)
6448 struct ctl_table *table;
6449 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
6451 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
6455 for (i = 0; table[i].data; i++) {
6456 table[i].data += (char *)p - (char *)&ipv6_devconf;
6457 /* If one of these is already set, then it is not safe to
6458 * overwrite either of them: this makes proc_dointvec_minmax
6461 if (!table[i].extra1 && !table[i].extra2) {
6462 table[i].extra1 = idev; /* embedded; no ref */
6463 table[i].extra2 = net;
6467 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
6469 p->sysctl_header = register_net_sysctl(net, path, table);
6470 if (!p->sysctl_header)
6473 if (!strcmp(dev_name, "all"))
6474 ifindex = NETCONFA_IFINDEX_ALL;
6475 else if (!strcmp(dev_name, "default"))
6476 ifindex = NETCONFA_IFINDEX_DEFAULT;
6478 ifindex = idev->dev->ifindex;
6479 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
6489 static void __addrconf_sysctl_unregister(struct net *net,
6490 struct ipv6_devconf *p, int ifindex)
6492 struct ctl_table *table;
6494 if (!p->sysctl_header)
6497 table = p->sysctl_header->ctl_table_arg;
6498 unregister_net_sysctl_table(p->sysctl_header);
6499 p->sysctl_header = NULL;
6502 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
6505 static int addrconf_sysctl_register(struct inet6_dev *idev)
6509 if (!sysctl_dev_name_is_allowed(idev->dev->name))
6512 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
6513 &ndisc_ifinfo_sysctl_change);
6516 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
6519 neigh_sysctl_unregister(idev->nd_parms);
6524 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
6526 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf,
6527 idev->dev->ifindex);
6528 neigh_sysctl_unregister(idev->nd_parms);
6534 static int __net_init addrconf_init_net(struct net *net)
6537 struct ipv6_devconf *all, *dflt;
6539 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
6543 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
6545 goto err_alloc_dflt;
6547 /* these will be inherited by all namespaces */
6548 dflt->autoconf = ipv6_defaults.autoconf;
6549 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
6551 dflt->stable_secret.initialized = false;
6552 all->stable_secret.initialized = false;
6554 net->ipv6.devconf_all = all;
6555 net->ipv6.devconf_dflt = dflt;
6557 #ifdef CONFIG_SYSCTL
6558 err = __addrconf_sysctl_register(net, "all", NULL, all);
6562 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
6568 #ifdef CONFIG_SYSCTL
6570 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
6580 static void __net_exit addrconf_exit_net(struct net *net)
6582 #ifdef CONFIG_SYSCTL
6583 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt,
6584 NETCONFA_IFINDEX_DEFAULT);
6585 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all,
6586 NETCONFA_IFINDEX_ALL);
6588 kfree(net->ipv6.devconf_dflt);
6589 kfree(net->ipv6.devconf_all);
6592 static struct pernet_operations addrconf_ops = {
6593 .init = addrconf_init_net,
6594 .exit = addrconf_exit_net,
6597 static struct rtnl_af_ops inet6_ops __read_mostly = {
6599 .fill_link_af = inet6_fill_link_af,
6600 .get_link_af_size = inet6_get_link_af_size,
6601 .validate_link_af = inet6_validate_link_af,
6602 .set_link_af = inet6_set_link_af,
6606 * Init / cleanup code
6609 int __init addrconf_init(void)
6611 struct inet6_dev *idev;
6614 err = ipv6_addr_label_init();
6616 pr_crit("%s: cannot initialize default policy table: %d\n",
6621 err = register_pernet_subsys(&addrconf_ops);
6625 addrconf_wq = create_workqueue("ipv6_addrconf");
6631 /* The addrconf netdev notifier requires that loopback_dev
6632 * has it's ipv6 private information allocated and setup
6633 * before it can bring up and give link-local addresses
6634 * to other devices which are up.
6636 * Unfortunately, loopback_dev is not necessarily the first
6637 * entry in the global dev_base list of net devices. In fact,
6638 * it is likely to be the very last entry on that list.
6639 * So this causes the notifier registry below to try and
6640 * give link-local addresses to all devices besides loopback_dev
6641 * first, then loopback_dev, which cases all the non-loopback_dev
6642 * devices to fail to get a link-local address.
6644 * So, as a temporary fix, allocate the ipv6 structure for
6645 * loopback_dev first by hand.
6646 * Longer term, all of the dependencies ipv6 has upon the loopback
6647 * device and it being up should be removed.
6650 idev = ipv6_add_dev(init_net.loopback_dev);
6653 err = PTR_ERR(idev);
6657 ip6_route_init_special_entries();
6659 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6660 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
6662 register_netdevice_notifier(&ipv6_dev_notf);
6666 rtnl_af_register(&inet6_ops);
6668 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK,
6669 NULL, inet6_dump_ifinfo, 0);
6673 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR,
6674 inet6_rtm_newaddr, NULL, 0);
6677 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR,
6678 inet6_rtm_deladdr, NULL, 0);
6681 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR,
6682 inet6_rtm_getaddr, inet6_dump_ifaddr,
6683 RTNL_FLAG_DOIT_UNLOCKED);
6686 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST,
6687 NULL, inet6_dump_ifmcaddr, 0);
6690 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST,
6691 NULL, inet6_dump_ifacaddr, 0);
6694 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF,
6695 inet6_netconf_get_devconf,
6696 inet6_netconf_dump_devconf,
6697 RTNL_FLAG_DOIT_UNLOCKED);
6700 err = ipv6_addr_label_rtnl_register();
6706 rtnl_unregister_all(PF_INET6);
6707 rtnl_af_unregister(&inet6_ops);
6708 unregister_netdevice_notifier(&ipv6_dev_notf);
6710 destroy_workqueue(addrconf_wq);
6712 unregister_pernet_subsys(&addrconf_ops);
6714 ipv6_addr_label_cleanup();
6719 void addrconf_cleanup(void)
6721 struct net_device *dev;
6724 unregister_netdevice_notifier(&ipv6_dev_notf);
6725 unregister_pernet_subsys(&addrconf_ops);
6726 ipv6_addr_label_cleanup();
6728 rtnl_af_unregister(&inet6_ops);
6732 /* clean dev list */
6733 for_each_netdev(&init_net, dev) {
6734 if (__in6_dev_get(dev) == NULL)
6736 addrconf_ifdown(dev, 1);
6738 addrconf_ifdown(init_net.loopback_dev, 2);
6743 spin_lock_bh(&addrconf_hash_lock);
6744 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6745 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
6746 spin_unlock_bh(&addrconf_hash_lock);
6747 cancel_delayed_work(&addr_chk_work);
6750 destroy_workqueue(addrconf_wq);