1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * IPv6 Address [auto]configuration
4 * Linux INET6 implementation
7 * Pedro Roque <roque@di.fc.ul.pt>
8 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
14 * Janos Farkas : delete timer on ifdown
15 * <chexum@bankinf.banki.hu>
16 * Andi Kleen : kill double kfree on module
18 * Maciej W. Rozycki : FDDI support
19 * sekiya@USAGI : Don't send too many RS
21 * yoshfuji@USAGI : Fixed interval between DAD
23 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
24 * address validation timer.
25 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
27 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
28 * address on a same interface.
29 * YOSHIFUJI Hideaki @USAGI : ARCnet support
30 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
32 * YOSHIFUJI Hideaki @USAGI : improved source address
33 * selection; consider scope,
37 #define pr_fmt(fmt) "IPv6: " fmt
39 #include <linux/errno.h>
40 #include <linux/types.h>
41 #include <linux/kernel.h>
42 #include <linux/sched/signal.h>
43 #include <linux/socket.h>
44 #include <linux/sockios.h>
45 #include <linux/net.h>
46 #include <linux/inet.h>
47 #include <linux/in6.h>
48 #include <linux/netdevice.h>
49 #include <linux/if_addr.h>
50 #include <linux/if_arp.h>
51 #include <linux/if_arcnet.h>
52 #include <linux/if_infiniband.h>
53 #include <linux/route.h>
54 #include <linux/inetdevice.h>
55 #include <linux/init.h>
56 #include <linux/slab.h>
58 #include <linux/sysctl.h>
60 #include <linux/capability.h>
61 #include <linux/delay.h>
62 #include <linux/notifier.h>
63 #include <linux/string.h>
64 #include <linux/hash.h>
66 #include <net/net_namespace.h>
70 #include <net/6lowpan.h>
71 #include <net/firewire.h>
73 #include <net/protocol.h>
74 #include <net/ndisc.h>
75 #include <net/ip6_route.h>
76 #include <net/addrconf.h>
79 #include <net/netlink.h>
80 #include <net/pkt_sched.h>
81 #include <net/l3mdev.h>
82 #include <linux/if_tunnel.h>
83 #include <linux/rtnetlink.h>
84 #include <linux/netconf.h>
85 #include <linux/random.h>
86 #include <linux/uaccess.h>
87 #include <asm/unaligned.h>
89 #include <linux/proc_fs.h>
90 #include <linux/seq_file.h>
91 #include <linux/export.h>
92 #include <linux/ioam6.h>
94 #define INFINITY_LIFE_TIME 0xFFFFFFFF
96 #define IPV6_MAX_STRLEN \
97 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
99 static inline u32 cstamp_delta(unsigned long cstamp)
101 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
104 static inline s32 rfc3315_s14_backoff_init(s32 irt)
106 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */
107 u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt;
108 do_div(tmp, 1000000);
112 static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt)
114 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */
115 u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt;
116 do_div(tmp, 1000000);
117 if ((s32)tmp > mrt) {
118 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */
119 tmp = (900000 + prandom_u32() % 200001) * (u64)mrt;
120 do_div(tmp, 1000000);
126 static int addrconf_sysctl_register(struct inet6_dev *idev);
127 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
129 static inline int addrconf_sysctl_register(struct inet6_dev *idev)
134 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
139 static void ipv6_gen_rnd_iid(struct in6_addr *addr);
141 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
142 static int ipv6_count_addresses(const struct inet6_dev *idev);
143 static int ipv6_generate_stable_address(struct in6_addr *addr,
145 const struct inet6_dev *idev);
147 #define IN6_ADDR_HSIZE_SHIFT 8
148 #define IN6_ADDR_HSIZE (1 << IN6_ADDR_HSIZE_SHIFT)
150 * Configured unicast address hash table
152 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
153 static DEFINE_SPINLOCK(addrconf_hash_lock);
155 static void addrconf_verify(void);
156 static void addrconf_verify_rtnl(void);
157 static void addrconf_verify_work(struct work_struct *);
159 static struct workqueue_struct *addrconf_wq;
160 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
162 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
163 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
165 static void addrconf_type_change(struct net_device *dev,
166 unsigned long event);
167 static int addrconf_ifdown(struct net_device *dev, bool unregister);
169 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
171 const struct net_device *dev,
172 u32 flags, u32 noflags,
175 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
176 static void addrconf_dad_work(struct work_struct *w);
177 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
179 static void addrconf_dad_run(struct inet6_dev *idev, bool restart);
180 static void addrconf_rs_timer(struct timer_list *t);
181 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
182 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
184 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
185 struct prefix_info *pinfo);
187 static struct ipv6_devconf ipv6_devconf __read_mostly = {
189 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
190 .mtu6 = IPV6_MIN_MTU,
192 .accept_redirects = 1,
194 .force_mld_version = 0,
195 .mldv1_unsolicited_report_interval = 10 * HZ,
196 .mldv2_unsolicited_report_interval = HZ,
198 .rtr_solicits = MAX_RTR_SOLICITATIONS,
199 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
200 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
201 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
203 .temp_valid_lft = TEMP_VALID_LIFETIME,
204 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
205 .regen_max_retry = REGEN_MAX_RETRY,
206 .max_desync_factor = MAX_DESYNC_FACTOR,
207 .max_addresses = IPV6_MAX_ADDRESSES,
208 .accept_ra_defrtr = 1,
209 .ra_defrtr_metric = IP6_RT_PRIO_USER,
210 .accept_ra_from_local = 0,
211 .accept_ra_min_hop_limit= 1,
212 .accept_ra_pinfo = 1,
213 #ifdef CONFIG_IPV6_ROUTER_PREF
214 .accept_ra_rtr_pref = 1,
215 .rtr_probe_interval = 60 * HZ,
216 #ifdef CONFIG_IPV6_ROUTE_INFO
217 .accept_ra_rt_info_min_plen = 0,
218 .accept_ra_rt_info_max_plen = 0,
222 .accept_source_route = 0, /* we do not accept RH0 by default. */
225 .suppress_frag_ndisc = 1,
228 .initialized = false,
230 .use_oif_addrs_only = 0,
231 .ignore_routes_with_linkdown = 0,
232 .keep_addr_on_down = 0,
234 #ifdef CONFIG_IPV6_SEG6_HMAC
235 .seg6_require_hmac = 0,
238 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
240 .rpl_seg_enabled = 0,
242 .ioam6_id = IOAM6_DEFAULT_IF_ID,
243 .ioam6_id_wide = IOAM6_DEFAULT_IF_ID_WIDE,
246 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
248 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
249 .mtu6 = IPV6_MIN_MTU,
251 .accept_redirects = 1,
253 .force_mld_version = 0,
254 .mldv1_unsolicited_report_interval = 10 * HZ,
255 .mldv2_unsolicited_report_interval = HZ,
257 .rtr_solicits = MAX_RTR_SOLICITATIONS,
258 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
259 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
260 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
262 .temp_valid_lft = TEMP_VALID_LIFETIME,
263 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
264 .regen_max_retry = REGEN_MAX_RETRY,
265 .max_desync_factor = MAX_DESYNC_FACTOR,
266 .max_addresses = IPV6_MAX_ADDRESSES,
267 .accept_ra_defrtr = 1,
268 .ra_defrtr_metric = IP6_RT_PRIO_USER,
269 .accept_ra_from_local = 0,
270 .accept_ra_min_hop_limit= 1,
271 .accept_ra_pinfo = 1,
272 #ifdef CONFIG_IPV6_ROUTER_PREF
273 .accept_ra_rtr_pref = 1,
274 .rtr_probe_interval = 60 * HZ,
275 #ifdef CONFIG_IPV6_ROUTE_INFO
276 .accept_ra_rt_info_min_plen = 0,
277 .accept_ra_rt_info_max_plen = 0,
281 .accept_source_route = 0, /* we do not accept RH0 by default. */
284 .suppress_frag_ndisc = 1,
287 .initialized = false,
289 .use_oif_addrs_only = 0,
290 .ignore_routes_with_linkdown = 0,
291 .keep_addr_on_down = 0,
293 #ifdef CONFIG_IPV6_SEG6_HMAC
294 .seg6_require_hmac = 0,
297 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
299 .rpl_seg_enabled = 0,
301 .ioam6_id = IOAM6_DEFAULT_IF_ID,
302 .ioam6_id_wide = IOAM6_DEFAULT_IF_ID_WIDE,
305 /* Check if link is ready: is it up and is a valid qdisc available */
306 static inline bool addrconf_link_ready(const struct net_device *dev)
308 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev);
311 static void addrconf_del_rs_timer(struct inet6_dev *idev)
313 if (del_timer(&idev->rs_timer))
317 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
319 if (cancel_delayed_work(&ifp->dad_work))
323 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
326 if (!timer_pending(&idev->rs_timer))
328 mod_timer(&idev->rs_timer, jiffies + when);
331 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
335 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay))
339 static int snmp6_alloc_dev(struct inet6_dev *idev)
343 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
344 if (!idev->stats.ipv6)
347 for_each_possible_cpu(i) {
348 struct ipstats_mib *addrconf_stats;
349 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
350 u64_stats_init(&addrconf_stats->syncp);
354 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
356 if (!idev->stats.icmpv6dev)
358 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
360 if (!idev->stats.icmpv6msgdev)
366 kfree(idev->stats.icmpv6dev);
368 free_percpu(idev->stats.ipv6);
373 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
375 struct inet6_dev *ndev;
380 if (dev->mtu < IPV6_MIN_MTU)
381 return ERR_PTR(-EINVAL);
383 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
387 rwlock_init(&ndev->lock);
389 INIT_LIST_HEAD(&ndev->addr_list);
390 timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0);
391 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
393 if (ndev->cnf.stable_secret.initialized)
394 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
396 ndev->cnf.mtu6 = dev->mtu;
398 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
399 if (!ndev->nd_parms) {
403 if (ndev->cnf.forwarding)
404 dev_disable_lro(dev);
405 /* We refer to the device */
408 if (snmp6_alloc_dev(ndev) < 0) {
409 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n",
411 neigh_parms_release(&nd_tbl, ndev->nd_parms);
417 if (snmp6_register_dev(ndev) < 0) {
418 netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n",
419 __func__, dev->name);
423 /* One reference from device. */
424 refcount_set(&ndev->refcnt, 1);
426 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
427 ndev->cnf.accept_dad = -1;
429 #if IS_ENABLED(CONFIG_IPV6_SIT)
430 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
431 pr_info("%s: Disabled Multicast RS\n", dev->name);
432 ndev->cnf.rtr_solicits = 0;
436 INIT_LIST_HEAD(&ndev->tempaddr_list);
437 ndev->desync_factor = U32_MAX;
438 if ((dev->flags&IFF_LOOPBACK) ||
439 dev->type == ARPHRD_TUNNEL ||
440 dev->type == ARPHRD_TUNNEL6 ||
441 dev->type == ARPHRD_SIT ||
442 dev->type == ARPHRD_NONE) {
443 ndev->cnf.use_tempaddr = -1;
446 ndev->token = in6addr_any;
448 if (netif_running(dev) && addrconf_link_ready(dev))
449 ndev->if_flags |= IF_READY;
451 ipv6_mc_init_dev(ndev);
452 ndev->tstamp = jiffies;
453 err = addrconf_sysctl_register(ndev);
455 ipv6_mc_destroy_dev(ndev);
456 snmp6_unregister_dev(ndev);
459 /* protected by rtnl_lock */
460 rcu_assign_pointer(dev->ip6_ptr, ndev);
462 /* Join interface-local all-node multicast group */
463 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
465 /* Join all-node multicast group */
466 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
468 /* Join all-router multicast group if forwarding is set */
469 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
470 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
475 neigh_parms_release(&nd_tbl, ndev->nd_parms);
477 in6_dev_finish_destroy(ndev);
481 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
483 struct inet6_dev *idev;
487 idev = __in6_dev_get(dev);
489 idev = ipv6_add_dev(dev);
494 if (dev->flags&IFF_UP)
499 static int inet6_netconf_msgsize_devconf(int type)
501 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
502 + nla_total_size(4); /* NETCONFA_IFINDEX */
505 if (type == NETCONFA_ALL)
508 if (all || type == NETCONFA_FORWARDING)
509 size += nla_total_size(4);
510 #ifdef CONFIG_IPV6_MROUTE
511 if (all || type == NETCONFA_MC_FORWARDING)
512 size += nla_total_size(4);
514 if (all || type == NETCONFA_PROXY_NEIGH)
515 size += nla_total_size(4);
517 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
518 size += nla_total_size(4);
523 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
524 struct ipv6_devconf *devconf, u32 portid,
525 u32 seq, int event, unsigned int flags,
528 struct nlmsghdr *nlh;
529 struct netconfmsg *ncm;
532 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
537 if (type == NETCONFA_ALL)
540 ncm = nlmsg_data(nlh);
541 ncm->ncm_family = AF_INET6;
543 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
544 goto nla_put_failure;
549 if ((all || type == NETCONFA_FORWARDING) &&
550 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
551 goto nla_put_failure;
552 #ifdef CONFIG_IPV6_MROUTE
553 if ((all || type == NETCONFA_MC_FORWARDING) &&
554 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
555 devconf->mc_forwarding) < 0)
556 goto nla_put_failure;
558 if ((all || type == NETCONFA_PROXY_NEIGH) &&
559 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
560 goto nla_put_failure;
562 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
563 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
564 devconf->ignore_routes_with_linkdown) < 0)
565 goto nla_put_failure;
572 nlmsg_cancel(skb, nlh);
576 void inet6_netconf_notify_devconf(struct net *net, int event, int type,
577 int ifindex, struct ipv6_devconf *devconf)
582 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL);
586 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
589 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
590 WARN_ON(err == -EMSGSIZE);
594 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL);
597 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
600 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
601 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
602 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
603 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
604 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
607 static int inet6_netconf_valid_get_req(struct sk_buff *skb,
608 const struct nlmsghdr *nlh,
610 struct netlink_ext_ack *extack)
614 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) {
615 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf get request");
619 if (!netlink_strict_get_check(skb))
620 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg),
622 devconf_ipv6_policy, extack);
624 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg),
626 devconf_ipv6_policy, extack);
630 for (i = 0; i <= NETCONFA_MAX; i++) {
635 case NETCONFA_IFINDEX:
638 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request");
646 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
647 struct nlmsghdr *nlh,
648 struct netlink_ext_ack *extack)
650 struct net *net = sock_net(in_skb->sk);
651 struct nlattr *tb[NETCONFA_MAX+1];
652 struct inet6_dev *in6_dev = NULL;
653 struct net_device *dev = NULL;
655 struct ipv6_devconf *devconf;
659 err = inet6_netconf_valid_get_req(in_skb, nlh, tb, extack);
663 if (!tb[NETCONFA_IFINDEX])
667 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
669 case NETCONFA_IFINDEX_ALL:
670 devconf = net->ipv6.devconf_all;
672 case NETCONFA_IFINDEX_DEFAULT:
673 devconf = net->ipv6.devconf_dflt;
676 dev = dev_get_by_index(net, ifindex);
679 in6_dev = in6_dev_get(dev);
682 devconf = &in6_dev->cnf;
687 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL);
691 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
692 NETLINK_CB(in_skb).portid,
693 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
696 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
697 WARN_ON(err == -EMSGSIZE);
701 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
704 in6_dev_put(in6_dev);
709 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
710 struct netlink_callback *cb)
712 const struct nlmsghdr *nlh = cb->nlh;
713 struct net *net = sock_net(skb->sk);
716 struct net_device *dev;
717 struct inet6_dev *idev;
718 struct hlist_head *head;
720 if (cb->strict_check) {
721 struct netlink_ext_ack *extack = cb->extack;
722 struct netconfmsg *ncm;
724 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) {
725 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request");
729 if (nlmsg_attrlen(nlh, sizeof(*ncm))) {
730 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request");
736 s_idx = idx = cb->args[1];
738 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
740 head = &net->dev_index_head[h];
742 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
744 hlist_for_each_entry_rcu(dev, head, index_hlist) {
747 idev = __in6_dev_get(dev);
751 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
753 NETLINK_CB(cb->skb).portid,
761 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
767 if (h == NETDEV_HASHENTRIES) {
768 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
769 net->ipv6.devconf_all,
770 NETLINK_CB(cb->skb).portid,
772 RTM_NEWNETCONF, NLM_F_MULTI,
778 if (h == NETDEV_HASHENTRIES + 1) {
779 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
780 net->ipv6.devconf_dflt,
781 NETLINK_CB(cb->skb).portid,
783 RTM_NEWNETCONF, NLM_F_MULTI,
797 static void dev_forward_change(struct inet6_dev *idev)
799 struct net_device *dev;
800 struct inet6_ifaddr *ifa;
805 if (idev->cnf.forwarding)
806 dev_disable_lro(dev);
807 if (dev->flags & IFF_MULTICAST) {
808 if (idev->cnf.forwarding) {
809 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
810 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
811 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
813 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
814 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
815 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
819 list_for_each_entry(ifa, &idev->addr_list, if_list) {
820 if (ifa->flags&IFA_F_TENTATIVE)
822 if (idev->cnf.forwarding)
823 addrconf_join_anycast(ifa);
825 addrconf_leave_anycast(ifa);
827 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
829 dev->ifindex, &idev->cnf);
833 static void addrconf_forward_change(struct net *net, __s32 newf)
835 struct net_device *dev;
836 struct inet6_dev *idev;
838 for_each_netdev(net, dev) {
839 idev = __in6_dev_get(dev);
841 int changed = (!idev->cnf.forwarding) ^ (!newf);
842 idev->cnf.forwarding = newf;
844 dev_forward_change(idev);
849 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
855 return restart_syscall();
857 net = (struct net *)table->extra2;
861 if (p == &net->ipv6.devconf_dflt->forwarding) {
862 if ((!newf) ^ (!old))
863 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
865 NETCONFA_IFINDEX_DEFAULT,
866 net->ipv6.devconf_dflt);
871 if (p == &net->ipv6.devconf_all->forwarding) {
872 int old_dflt = net->ipv6.devconf_dflt->forwarding;
874 net->ipv6.devconf_dflt->forwarding = newf;
875 if ((!newf) ^ (!old_dflt))
876 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
878 NETCONFA_IFINDEX_DEFAULT,
879 net->ipv6.devconf_dflt);
881 addrconf_forward_change(net, newf);
882 if ((!newf) ^ (!old))
883 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
885 NETCONFA_IFINDEX_ALL,
886 net->ipv6.devconf_all);
887 } else if ((!newf) ^ (!old))
888 dev_forward_change((struct inet6_dev *)table->extra1);
892 rt6_purge_dflt_routers(net);
896 static void addrconf_linkdown_change(struct net *net, __s32 newf)
898 struct net_device *dev;
899 struct inet6_dev *idev;
901 for_each_netdev(net, dev) {
902 idev = __in6_dev_get(dev);
904 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
906 idev->cnf.ignore_routes_with_linkdown = newf;
908 inet6_netconf_notify_devconf(dev_net(dev),
910 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
917 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
923 return restart_syscall();
925 net = (struct net *)table->extra2;
929 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
930 if ((!newf) ^ (!old))
931 inet6_netconf_notify_devconf(net,
933 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
934 NETCONFA_IFINDEX_DEFAULT,
935 net->ipv6.devconf_dflt);
940 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
941 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
942 addrconf_linkdown_change(net, newf);
943 if ((!newf) ^ (!old))
944 inet6_netconf_notify_devconf(net,
946 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
947 NETCONFA_IFINDEX_ALL,
948 net->ipv6.devconf_all);
957 /* Nobody refers to this ifaddr, destroy it */
958 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
960 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
962 #ifdef NET_REFCNT_DEBUG
963 pr_debug("%s\n", __func__);
966 in6_dev_put(ifp->idev);
968 if (cancel_delayed_work(&ifp->dad_work))
969 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
972 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
973 pr_warn("Freeing alive inet6 address %p\n", ifp);
981 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
984 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
987 * Each device address list is sorted in order of scope -
988 * global before linklocal.
990 list_for_each(p, &idev->addr_list) {
991 struct inet6_ifaddr *ifa
992 = list_entry(p, struct inet6_ifaddr, if_list);
993 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
997 list_add_tail_rcu(&ifp->if_list, p);
1000 static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr)
1002 u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net);
1004 return hash_32(val, IN6_ADDR_HSIZE_SHIFT);
1007 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1008 struct net_device *dev, unsigned int hash)
1010 struct inet6_ifaddr *ifp;
1012 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1013 if (!net_eq(dev_net(ifp->idev->dev), net))
1015 if (ipv6_addr_equal(&ifp->addr, addr)) {
1016 if (!dev || ifp->idev->dev == dev)
1023 static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa)
1025 unsigned int hash = inet6_addr_hash(dev_net(dev), &ifa->addr);
1028 spin_lock(&addrconf_hash_lock);
1030 /* Ignore adding duplicate addresses on an interface */
1031 if (ipv6_chk_same_addr(dev_net(dev), &ifa->addr, dev, hash)) {
1032 netdev_dbg(dev, "ipv6_add_addr: already assigned\n");
1035 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
1038 spin_unlock(&addrconf_hash_lock);
1043 /* On success it returns ifp with increased reference count */
1045 static struct inet6_ifaddr *
1046 ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg,
1047 bool can_block, struct netlink_ext_ack *extack)
1049 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC;
1050 int addr_type = ipv6_addr_type(cfg->pfx);
1051 struct net *net = dev_net(idev->dev);
1052 struct inet6_ifaddr *ifa = NULL;
1053 struct fib6_info *f6i = NULL;
1056 if (addr_type == IPV6_ADDR_ANY ||
1057 (addr_type & IPV6_ADDR_MULTICAST &&
1058 !(cfg->ifa_flags & IFA_F_MCAUTOJOIN)) ||
1059 (!(idev->dev->flags & IFF_LOOPBACK) &&
1060 !netif_is_l3_master(idev->dev) &&
1061 addr_type & IPV6_ADDR_LOOPBACK))
1062 return ERR_PTR(-EADDRNOTAVAIL);
1065 err = -ENODEV; /*XXX*/
1069 if (idev->cnf.disable_ipv6) {
1074 /* validator notifier needs to be blocking;
1075 * do not call in atomic context
1078 struct in6_validator_info i6vi = {
1079 .i6vi_addr = *cfg->pfx,
1084 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi);
1085 err = notifier_to_errno(err);
1090 ifa = kzalloc(sizeof(*ifa), gfp_flags | __GFP_ACCOUNT);
1096 f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags);
1103 if (net->ipv6.devconf_all->disable_policy ||
1104 idev->cnf.disable_policy)
1105 f6i->dst_nopolicy = true;
1107 neigh_parms_data_state_setall(idev->nd_parms);
1109 ifa->addr = *cfg->pfx;
1111 ifa->peer_addr = *cfg->peer_pfx;
1113 spin_lock_init(&ifa->lock);
1114 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
1115 INIT_HLIST_NODE(&ifa->addr_lst);
1116 ifa->scope = cfg->scope;
1117 ifa->prefix_len = cfg->plen;
1118 ifa->rt_priority = cfg->rt_priority;
1119 ifa->flags = cfg->ifa_flags;
1120 /* No need to add the TENTATIVE flag for addresses with NODAD */
1121 if (!(cfg->ifa_flags & IFA_F_NODAD))
1122 ifa->flags |= IFA_F_TENTATIVE;
1123 ifa->valid_lft = cfg->valid_lft;
1124 ifa->prefered_lft = cfg->preferred_lft;
1125 ifa->cstamp = ifa->tstamp = jiffies;
1126 ifa->tokenized = false;
1134 refcount_set(&ifa->refcnt, 1);
1138 err = ipv6_add_addr_hash(idev->dev, ifa);
1140 rcu_read_unlock_bh();
1144 write_lock(&idev->lock);
1146 /* Add to inet6_dev unicast addr list. */
1147 ipv6_link_dev_addr(idev, ifa);
1149 if (ifa->flags&IFA_F_TEMPORARY) {
1150 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1155 write_unlock(&idev->lock);
1157 rcu_read_unlock_bh();
1159 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1161 if (unlikely(err < 0)) {
1162 fib6_info_release(f6i);
1166 in6_dev_put(ifa->idev);
1175 enum cleanup_prefix_rt_t {
1176 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1177 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1178 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1182 * Check, whether the prefix for ifp would still need a prefix route
1183 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1186 * 1) we don't purge prefix if address was not permanent.
1187 * prefix is managed by its own lifetime.
1188 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1189 * 3) if there are no addresses, delete prefix.
1190 * 4) if there are still other permanent address(es),
1191 * corresponding prefix is still permanent.
1192 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1193 * don't purge the prefix, assume user space is managing it.
1194 * 6) otherwise, update prefix lifetime to the
1195 * longest valid lifetime among the corresponding
1196 * addresses on the device.
1197 * Note: subsequent RA will update lifetime.
1199 static enum cleanup_prefix_rt_t
1200 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1202 struct inet6_ifaddr *ifa;
1203 struct inet6_dev *idev = ifp->idev;
1204 unsigned long lifetime;
1205 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1209 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1212 if (ifa->prefix_len != ifp->prefix_len ||
1213 !ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1216 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1217 return CLEANUP_PREFIX_RT_NOP;
1219 action = CLEANUP_PREFIX_RT_EXPIRE;
1221 spin_lock(&ifa->lock);
1223 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1225 * Note: Because this address is
1226 * not permanent, lifetime <
1227 * LONG_MAX / HZ here.
1229 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1230 *expires = ifa->tstamp + lifetime * HZ;
1231 spin_unlock(&ifa->lock);
1238 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires,
1239 bool del_rt, bool del_peer)
1241 struct fib6_info *f6i;
1243 f6i = addrconf_get_prefix_route(del_peer ? &ifp->peer_addr : &ifp->addr,
1245 ifp->idev->dev, 0, RTF_DEFAULT, true);
1248 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false);
1250 if (!(f6i->fib6_flags & RTF_EXPIRES))
1251 fib6_set_expires(f6i, expires);
1252 fib6_info_release(f6i);
1258 /* This function wants to get referenced ifp and releases it before return */
1260 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1263 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1264 unsigned long expires;
1268 spin_lock_bh(&ifp->lock);
1270 ifp->state = INET6_IFADDR_STATE_DEAD;
1271 spin_unlock_bh(&ifp->lock);
1273 if (state == INET6_IFADDR_STATE_DEAD)
1276 spin_lock_bh(&addrconf_hash_lock);
1277 hlist_del_init_rcu(&ifp->addr_lst);
1278 spin_unlock_bh(&addrconf_hash_lock);
1280 write_lock_bh(&ifp->idev->lock);
1282 if (ifp->flags&IFA_F_TEMPORARY) {
1283 list_del(&ifp->tmp_list);
1285 in6_ifa_put(ifp->ifpub);
1291 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1292 action = check_cleanup_prefix_route(ifp, &expires);
1294 list_del_rcu(&ifp->if_list);
1297 write_unlock_bh(&ifp->idev->lock);
1299 addrconf_del_dad_work(ifp);
1301 ipv6_ifa_notify(RTM_DELADDR, ifp);
1303 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1305 if (action != CLEANUP_PREFIX_RT_NOP) {
1306 cleanup_prefix_route(ifp, expires,
1307 action == CLEANUP_PREFIX_RT_DEL, false);
1310 /* clean up prefsrc entries */
1311 rt6_remove_prefsrc(ifp);
1316 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, bool block)
1318 struct inet6_dev *idev = ifp->idev;
1319 unsigned long tmp_tstamp, age;
1320 unsigned long regen_advance;
1321 unsigned long now = jiffies;
1322 s32 cnf_temp_preferred_lft;
1323 struct inet6_ifaddr *ift;
1324 struct ifa6_config cfg;
1325 long max_desync_factor;
1326 struct in6_addr addr;
1329 write_lock_bh(&idev->lock);
1333 if (idev->cnf.use_tempaddr <= 0) {
1334 write_unlock_bh(&idev->lock);
1335 pr_info("%s: use_tempaddr is disabled\n", __func__);
1340 spin_lock_bh(&ifp->lock);
1341 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1342 idev->cnf.use_tempaddr = -1; /*XXX*/
1343 spin_unlock_bh(&ifp->lock);
1344 write_unlock_bh(&idev->lock);
1345 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1352 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1353 ipv6_gen_rnd_iid(&addr);
1355 age = (now - ifp->tstamp) / HZ;
1357 regen_advance = idev->cnf.regen_max_retry *
1358 idev->cnf.dad_transmits *
1359 max(NEIGH_VAR(idev->nd_parms, RETRANS_TIME), HZ/100) / HZ;
1361 /* recalculate max_desync_factor each time and update
1362 * idev->desync_factor if it's larger
1364 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
1365 max_desync_factor = min_t(__u32,
1366 idev->cnf.max_desync_factor,
1367 cnf_temp_preferred_lft - regen_advance);
1369 if (unlikely(idev->desync_factor > max_desync_factor)) {
1370 if (max_desync_factor > 0) {
1371 get_random_bytes(&idev->desync_factor,
1372 sizeof(idev->desync_factor));
1373 idev->desync_factor %= max_desync_factor;
1375 idev->desync_factor = 0;
1379 memset(&cfg, 0, sizeof(cfg));
1380 cfg.valid_lft = min_t(__u32, ifp->valid_lft,
1381 idev->cnf.temp_valid_lft + age);
1382 cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor;
1383 cfg.preferred_lft = min_t(__u32, ifp->prefered_lft, cfg.preferred_lft);
1385 cfg.plen = ifp->prefix_len;
1386 tmp_tstamp = ifp->tstamp;
1387 spin_unlock_bh(&ifp->lock);
1389 write_unlock_bh(&idev->lock);
1391 /* A temporary address is created only if this calculated Preferred
1392 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1393 * an implementation must not create a temporary address with a zero
1394 * Preferred Lifetime.
1395 * Use age calculation as in addrconf_verify to avoid unnecessary
1396 * temporary addresses being generated.
1398 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1399 if (cfg.preferred_lft <= regen_advance + age) {
1406 cfg.ifa_flags = IFA_F_TEMPORARY;
1407 /* set in addrconf_prefix_rcv() */
1408 if (ifp->flags & IFA_F_OPTIMISTIC)
1409 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
1412 cfg.scope = ipv6_addr_scope(cfg.pfx);
1414 ift = ipv6_add_addr(idev, &cfg, block, NULL);
1418 pr_info("%s: retry temporary address regeneration\n", __func__);
1419 write_lock_bh(&idev->lock);
1423 spin_lock_bh(&ift->lock);
1426 ift->tstamp = tmp_tstamp;
1427 spin_unlock_bh(&ift->lock);
1429 addrconf_dad_start(ift);
1437 * Choose an appropriate source address (RFC3484)
1440 IPV6_SADDR_RULE_INIT = 0,
1441 IPV6_SADDR_RULE_LOCAL,
1442 IPV6_SADDR_RULE_SCOPE,
1443 IPV6_SADDR_RULE_PREFERRED,
1444 #ifdef CONFIG_IPV6_MIP6
1445 IPV6_SADDR_RULE_HOA,
1447 IPV6_SADDR_RULE_OIF,
1448 IPV6_SADDR_RULE_LABEL,
1449 IPV6_SADDR_RULE_PRIVACY,
1450 IPV6_SADDR_RULE_ORCHID,
1451 IPV6_SADDR_RULE_PREFIX,
1452 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1453 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1458 struct ipv6_saddr_score {
1461 struct inet6_ifaddr *ifa;
1462 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1467 struct ipv6_saddr_dst {
1468 const struct in6_addr *addr;
1475 static inline int ipv6_saddr_preferred(int type)
1477 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1482 static bool ipv6_use_optimistic_addr(struct net *net,
1483 struct inet6_dev *idev)
1485 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1488 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1490 if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic)
1499 static bool ipv6_allow_optimistic_dad(struct net *net,
1500 struct inet6_dev *idev)
1502 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1505 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1514 static int ipv6_get_saddr_eval(struct net *net,
1515 struct ipv6_saddr_score *score,
1516 struct ipv6_saddr_dst *dst,
1521 if (i <= score->rule) {
1523 case IPV6_SADDR_RULE_SCOPE:
1524 ret = score->scopedist;
1526 case IPV6_SADDR_RULE_PREFIX:
1527 ret = score->matchlen;
1530 ret = !!test_bit(i, score->scorebits);
1536 case IPV6_SADDR_RULE_INIT:
1537 /* Rule 0: remember if hiscore is not ready yet */
1540 case IPV6_SADDR_RULE_LOCAL:
1541 /* Rule 1: Prefer same address */
1542 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1544 case IPV6_SADDR_RULE_SCOPE:
1545 /* Rule 2: Prefer appropriate scope
1550 * ---+--+-+---> scope
1552 * | d is scope of the destination.
1554 * | \ <- smaller scope is better if
1555 * B-15 | \ if scope is enough for destination.
1556 * | ret = B - scope (-1 <= scope >= d <= 15).
1558 * |/ <- greater is better
1559 * -C / if scope is not enough for destination.
1560 * /| ret = scope - C (-1 <= d < scope <= 15).
1562 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1563 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1564 * Assume B = 0 and we get C > 29.
1566 ret = __ipv6_addr_src_scope(score->addr_type);
1567 if (ret >= dst->scope)
1570 ret -= 128; /* 30 is enough */
1571 score->scopedist = ret;
1573 case IPV6_SADDR_RULE_PREFERRED:
1575 /* Rule 3: Avoid deprecated and optimistic addresses */
1576 u8 avoid = IFA_F_DEPRECATED;
1578 if (!ipv6_use_optimistic_addr(net, score->ifa->idev))
1579 avoid |= IFA_F_OPTIMISTIC;
1580 ret = ipv6_saddr_preferred(score->addr_type) ||
1581 !(score->ifa->flags & avoid);
1584 #ifdef CONFIG_IPV6_MIP6
1585 case IPV6_SADDR_RULE_HOA:
1587 /* Rule 4: Prefer home address */
1588 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1589 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1593 case IPV6_SADDR_RULE_OIF:
1594 /* Rule 5: Prefer outgoing interface */
1595 ret = (!dst->ifindex ||
1596 dst->ifindex == score->ifa->idev->dev->ifindex);
1598 case IPV6_SADDR_RULE_LABEL:
1599 /* Rule 6: Prefer matching label */
1600 ret = ipv6_addr_label(net,
1601 &score->ifa->addr, score->addr_type,
1602 score->ifa->idev->dev->ifindex) == dst->label;
1604 case IPV6_SADDR_RULE_PRIVACY:
1606 /* Rule 7: Prefer public address
1607 * Note: prefer temporary address if use_tempaddr >= 2
1609 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1610 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1611 score->ifa->idev->cnf.use_tempaddr >= 2;
1612 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1615 case IPV6_SADDR_RULE_ORCHID:
1616 /* Rule 8-: Prefer ORCHID vs ORCHID or
1617 * non-ORCHID vs non-ORCHID
1619 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1620 ipv6_addr_orchid(dst->addr));
1622 case IPV6_SADDR_RULE_PREFIX:
1623 /* Rule 8: Use longest matching prefix */
1624 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1625 if (ret > score->ifa->prefix_len)
1626 ret = score->ifa->prefix_len;
1627 score->matchlen = ret;
1629 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1630 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1631 /* Optimistic addresses still have lower precedence than other
1632 * preferred addresses.
1634 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1642 __set_bit(i, score->scorebits);
1648 static int __ipv6_dev_get_saddr(struct net *net,
1649 struct ipv6_saddr_dst *dst,
1650 struct inet6_dev *idev,
1651 struct ipv6_saddr_score *scores,
1654 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1656 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) {
1660 * - Tentative Address (RFC2462 section 5.4)
1661 * - A tentative address is not considered
1662 * "assigned to an interface" in the traditional
1663 * sense, unless it is also flagged as optimistic.
1664 * - Candidate Source Address (section 4)
1665 * - In any case, anycast addresses, multicast
1666 * addresses, and the unspecified address MUST
1667 * NOT be included in a candidate set.
1669 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1670 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1673 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1675 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1676 score->addr_type & IPV6_ADDR_MULTICAST)) {
1677 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1683 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1685 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1686 int minihiscore, miniscore;
1688 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1689 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1691 if (minihiscore > miniscore) {
1692 if (i == IPV6_SADDR_RULE_SCOPE &&
1693 score->scopedist > 0) {
1696 * each remaining entry
1697 * has too small (not enough)
1698 * scope, because ifa entries
1699 * are sorted by their scope
1705 } else if (minihiscore < miniscore) {
1706 swap(hiscore, score);
1707 hiscore_idx = 1 - hiscore_idx;
1709 /* restore our iterator */
1710 score->ifa = hiscore->ifa;
1720 static int ipv6_get_saddr_master(struct net *net,
1721 const struct net_device *dst_dev,
1722 const struct net_device *master,
1723 struct ipv6_saddr_dst *dst,
1724 struct ipv6_saddr_score *scores,
1727 struct inet6_dev *idev;
1729 idev = __in6_dev_get(dst_dev);
1731 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1732 scores, hiscore_idx);
1734 idev = __in6_dev_get(master);
1736 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1737 scores, hiscore_idx);
1742 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1743 const struct in6_addr *daddr, unsigned int prefs,
1744 struct in6_addr *saddr)
1746 struct ipv6_saddr_score scores[2], *hiscore;
1747 struct ipv6_saddr_dst dst;
1748 struct inet6_dev *idev;
1749 struct net_device *dev;
1751 bool use_oif_addr = false;
1752 int hiscore_idx = 0;
1755 dst_type = __ipv6_addr_type(daddr);
1757 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1758 dst.scope = __ipv6_addr_src_scope(dst_type);
1759 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1762 scores[hiscore_idx].rule = -1;
1763 scores[hiscore_idx].ifa = NULL;
1767 /* Candidate Source Address (section 4)
1768 * - multicast and link-local destination address,
1769 * the set of candidate source address MUST only
1770 * include addresses assigned to interfaces
1771 * belonging to the same link as the outgoing
1773 * (- For site-local destination addresses, the
1774 * set of candidate source addresses MUST only
1775 * include addresses assigned to interfaces
1776 * belonging to the same site as the outgoing
1778 * - "It is RECOMMENDED that the candidate source addresses
1779 * be the set of unicast addresses assigned to the
1780 * interface that will be used to send to the destination
1781 * (the 'outgoing' interface)." (RFC 6724)
1784 idev = __in6_dev_get(dst_dev);
1785 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1786 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1787 (idev && idev->cnf.use_oif_addrs_only)) {
1788 use_oif_addr = true;
1794 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1796 const struct net_device *master;
1799 /* if dst_dev exists and is enslaved to an L3 device, then
1800 * prefer addresses from dst_dev and then the master over
1801 * any other enslaved devices in the L3 domain.
1803 master = l3mdev_master_dev_rcu(dst_dev);
1805 master_idx = master->ifindex;
1807 hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1809 scores, hiscore_idx);
1811 if (scores[hiscore_idx].ifa)
1815 for_each_netdev_rcu(net, dev) {
1816 /* only consider addresses on devices in the
1819 if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1821 idev = __in6_dev_get(dev);
1824 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1829 hiscore = &scores[hiscore_idx];
1831 ret = -EADDRNOTAVAIL;
1833 *saddr = hiscore->ifa->addr;
1838 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1840 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1843 struct inet6_ifaddr *ifp;
1844 int err = -EADDRNOTAVAIL;
1846 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1847 if (ifp->scope > IFA_LINK)
1849 if (ifp->scope == IFA_LINK &&
1850 !(ifp->flags & banned_flags)) {
1859 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1862 struct inet6_dev *idev;
1863 int err = -EADDRNOTAVAIL;
1866 idev = __in6_dev_get(dev);
1868 read_lock_bh(&idev->lock);
1869 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1870 read_unlock_bh(&idev->lock);
1876 static int ipv6_count_addresses(const struct inet6_dev *idev)
1878 const struct inet6_ifaddr *ifp;
1882 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list)
1888 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1889 const struct net_device *dev, int strict)
1891 return ipv6_chk_addr_and_flags(net, addr, dev, !dev,
1892 strict, IFA_F_TENTATIVE);
1894 EXPORT_SYMBOL(ipv6_chk_addr);
1896 /* device argument is used to find the L3 domain of interest. If
1897 * skip_dev_check is set, then the ifp device is not checked against
1898 * the passed in dev argument. So the 2 cases for addresses checks are:
1899 * 1. does the address exist in the L3 domain that dev is part of
1900 * (skip_dev_check = true), or
1902 * 2. does the address exist on the specific device
1903 * (skip_dev_check = false)
1905 static struct net_device *
1906 __ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1907 const struct net_device *dev, bool skip_dev_check,
1908 int strict, u32 banned_flags)
1910 unsigned int hash = inet6_addr_hash(net, addr);
1911 struct net_device *l3mdev, *ndev;
1912 struct inet6_ifaddr *ifp;
1917 l3mdev = l3mdev_master_dev_rcu(dev);
1921 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1922 ndev = ifp->idev->dev;
1923 if (!net_eq(dev_net(ndev), net))
1926 if (l3mdev_master_dev_rcu(ndev) != l3mdev)
1929 /* Decouple optimistic from tentative for evaluation here.
1930 * Ban optimistic addresses explicitly, when required.
1932 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1933 ? (ifp->flags&~IFA_F_TENTATIVE)
1935 if (ipv6_addr_equal(&ifp->addr, addr) &&
1936 !(ifp_flags&banned_flags) &&
1937 (!dev || ndev == dev ||
1938 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1948 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1949 const struct net_device *dev, bool skip_dev_check,
1950 int strict, u32 banned_flags)
1952 return __ipv6_chk_addr_and_flags(net, addr, dev, skip_dev_check,
1953 strict, banned_flags) ? 1 : 0;
1955 EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1958 /* Compares an address/prefix_len with addresses on device @dev.
1959 * If one is found it returns true.
1961 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1962 const unsigned int prefix_len, struct net_device *dev)
1964 const struct inet6_ifaddr *ifa;
1965 const struct inet6_dev *idev;
1969 idev = __in6_dev_get(dev);
1971 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
1972 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1981 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1983 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1985 const struct inet6_ifaddr *ifa;
1986 const struct inet6_dev *idev;
1991 idev = __in6_dev_get(dev);
1993 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
1994 onlink = ipv6_prefix_equal(addr, &ifa->addr,
2003 EXPORT_SYMBOL(ipv6_chk_prefix);
2006 * ipv6_dev_find - find the first device with a given source address.
2007 * @net: the net namespace
2008 * @addr: the source address
2009 * @dev: used to find the L3 domain of interest
2011 * The caller should be protected by RCU, or RTNL.
2013 struct net_device *ipv6_dev_find(struct net *net, const struct in6_addr *addr,
2014 struct net_device *dev)
2016 return __ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1,
2019 EXPORT_SYMBOL(ipv6_dev_find);
2021 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
2022 struct net_device *dev, int strict)
2024 unsigned int hash = inet6_addr_hash(net, addr);
2025 struct inet6_ifaddr *ifp, *result = NULL;
2028 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
2029 if (!net_eq(dev_net(ifp->idev->dev), net))
2031 if (ipv6_addr_equal(&ifp->addr, addr)) {
2032 if (!dev || ifp->idev->dev == dev ||
2033 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
2045 /* Gets referenced address, destroys ifaddr */
2047 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
2050 ifp->flags |= IFA_F_DADFAILED;
2052 if (ifp->flags&IFA_F_TEMPORARY) {
2053 struct inet6_ifaddr *ifpub;
2054 spin_lock_bh(&ifp->lock);
2057 in6_ifa_hold(ifpub);
2058 spin_unlock_bh(&ifp->lock);
2059 ipv6_create_tempaddr(ifpub, true);
2062 spin_unlock_bh(&ifp->lock);
2065 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) {
2066 spin_lock_bh(&ifp->lock);
2067 addrconf_del_dad_work(ifp);
2068 ifp->flags |= IFA_F_TENTATIVE;
2070 ifp->flags &= ~IFA_F_OPTIMISTIC;
2071 spin_unlock_bh(&ifp->lock);
2073 ipv6_ifa_notify(0, ifp);
2080 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
2084 spin_lock_bh(&ifp->lock);
2085 if (ifp->state == INET6_IFADDR_STATE_DAD) {
2086 ifp->state = INET6_IFADDR_STATE_POSTDAD;
2089 spin_unlock_bh(&ifp->lock);
2094 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp)
2096 struct inet6_dev *idev = ifp->idev;
2097 struct net *net = dev_net(ifp->idev->dev);
2099 if (addrconf_dad_end(ifp)) {
2104 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n",
2105 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source);
2107 spin_lock_bh(&ifp->lock);
2109 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
2110 struct in6_addr new_addr;
2111 struct inet6_ifaddr *ifp2;
2112 int retries = ifp->stable_privacy_retry + 1;
2113 struct ifa6_config cfg = {
2115 .plen = ifp->prefix_len,
2116 .ifa_flags = ifp->flags,
2117 .valid_lft = ifp->valid_lft,
2118 .preferred_lft = ifp->prefered_lft,
2119 .scope = ifp->scope,
2122 if (retries > net->ipv6.sysctl.idgen_retries) {
2123 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
2124 ifp->idev->dev->name);
2128 new_addr = ifp->addr;
2129 if (ipv6_generate_stable_address(&new_addr, retries,
2133 spin_unlock_bh(&ifp->lock);
2135 if (idev->cnf.max_addresses &&
2136 ipv6_count_addresses(idev) >=
2137 idev->cnf.max_addresses)
2140 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
2141 ifp->idev->dev->name);
2143 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL);
2147 spin_lock_bh(&ifp2->lock);
2148 ifp2->stable_privacy_retry = retries;
2149 ifp2->state = INET6_IFADDR_STATE_PREDAD;
2150 spin_unlock_bh(&ifp2->lock);
2152 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
2155 spin_lock_bh(&ifp->lock);
2159 /* transition from _POSTDAD to _ERRDAD */
2160 ifp->state = INET6_IFADDR_STATE_ERRDAD;
2161 spin_unlock_bh(&ifp->lock);
2163 addrconf_mod_dad_work(ifp, 0);
2167 /* Join to solicited addr multicast group.
2168 * caller must hold RTNL */
2169 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
2171 struct in6_addr maddr;
2173 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2176 addrconf_addr_solict_mult(addr, &maddr);
2177 ipv6_dev_mc_inc(dev, &maddr);
2180 /* caller must hold RTNL */
2181 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
2183 struct in6_addr maddr;
2185 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2188 addrconf_addr_solict_mult(addr, &maddr);
2189 __ipv6_dev_mc_dec(idev, &maddr);
2192 /* caller must hold RTNL */
2193 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
2195 struct in6_addr addr;
2197 if (ifp->prefix_len >= 127) /* RFC 6164 */
2199 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2200 if (ipv6_addr_any(&addr))
2202 __ipv6_dev_ac_inc(ifp->idev, &addr);
2205 /* caller must hold RTNL */
2206 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
2208 struct in6_addr addr;
2210 if (ifp->prefix_len >= 127) /* RFC 6164 */
2212 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2213 if (ipv6_addr_any(&addr))
2215 __ipv6_dev_ac_dec(ifp->idev, &addr);
2218 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev)
2220 switch (dev->addr_len) {
2222 memcpy(eui, dev->dev_addr, 3);
2225 memcpy(eui + 5, dev->dev_addr + 3, 3);
2227 case EUI64_ADDR_LEN:
2228 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2238 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2240 union fwnet_hwaddr *ha;
2242 if (dev->addr_len != FWNET_ALEN)
2245 ha = (union fwnet_hwaddr *)dev->dev_addr;
2247 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2252 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2254 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2255 if (dev->addr_len != ARCNET_ALEN)
2258 eui[7] = *(u8 *)dev->dev_addr;
2262 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2264 if (dev->addr_len != INFINIBAND_ALEN)
2266 memcpy(eui, dev->dev_addr + 12, 8);
2271 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
2275 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2276 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2277 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2278 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2279 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2280 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2284 memcpy(eui + 4, &addr, 4);
2288 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2290 if (dev->priv_flags & IFF_ISATAP)
2291 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2295 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2297 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2300 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2302 memcpy(eui, dev->perm_addr, 3);
2303 memcpy(eui + 5, dev->perm_addr + 3, 3);
2310 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2312 switch (dev->type) {
2315 return addrconf_ifid_eui48(eui, dev);
2317 return addrconf_ifid_arcnet(eui, dev);
2318 case ARPHRD_INFINIBAND:
2319 return addrconf_ifid_infiniband(eui, dev);
2321 return addrconf_ifid_sit(eui, dev);
2324 return addrconf_ifid_gre(eui, dev);
2325 case ARPHRD_6LOWPAN:
2326 return addrconf_ifid_6lowpan(eui, dev);
2327 case ARPHRD_IEEE1394:
2328 return addrconf_ifid_ieee1394(eui, dev);
2329 case ARPHRD_TUNNEL6:
2332 return addrconf_ifid_ip6tnl(eui, dev);
2337 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2340 struct inet6_ifaddr *ifp;
2342 read_lock_bh(&idev->lock);
2343 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2344 if (ifp->scope > IFA_LINK)
2346 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2347 memcpy(eui, ifp->addr.s6_addr+8, 8);
2352 read_unlock_bh(&idev->lock);
2356 /* Generation of a randomized Interface Identifier
2357 * draft-ietf-6man-rfc4941bis, Section 3.3.1
2360 static void ipv6_gen_rnd_iid(struct in6_addr *addr)
2363 get_random_bytes(&addr->s6_addr[8], 8);
2365 /* <draft-ietf-6man-rfc4941bis-08.txt>, Section 3.3.1:
2366 * check if generated address is not inappropriate:
2368 * - Reserved IPv6 Interface Identifiers
2369 * - XXX: already assigned to an address on the device
2372 /* Subnet-router anycast: 0000:0000:0000:0000 */
2373 if (!(addr->s6_addr32[2] | addr->s6_addr32[3]))
2376 /* IANA Ethernet block: 0200:5EFF:FE00:0000-0200:5EFF:FE00:5212
2377 * Proxy Mobile IPv6: 0200:5EFF:FE00:5213
2378 * IANA Ethernet block: 0200:5EFF:FE00:5214-0200:5EFF:FEFF:FFFF
2380 if (ntohl(addr->s6_addr32[2]) == 0x02005eff &&
2381 (ntohl(addr->s6_addr32[3]) & 0Xff000000) == 0xfe000000)
2384 /* Reserved subnet anycast addresses */
2385 if (ntohl(addr->s6_addr32[2]) == 0xfdffffff &&
2386 ntohl(addr->s6_addr32[3]) >= 0Xffffff80)
2395 addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric,
2396 struct net_device *dev, unsigned long expires,
2397 u32 flags, gfp_t gfp_flags)
2399 struct fib6_config cfg = {
2400 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
2401 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF,
2402 .fc_ifindex = dev->ifindex,
2403 .fc_expires = expires,
2405 .fc_flags = RTF_UP | flags,
2406 .fc_nlinfo.nl_net = dev_net(dev),
2407 .fc_protocol = RTPROT_KERNEL,
2408 .fc_type = RTN_UNICAST,
2413 /* Prevent useless cloning on PtP SIT.
2414 This thing is done here expecting that the whole
2415 class of non-broadcast devices need not cloning.
2417 #if IS_ENABLED(CONFIG_IPV6_SIT)
2418 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2419 cfg.fc_flags |= RTF_NONEXTHOP;
2422 ip6_route_add(&cfg, gfp_flags, NULL);
2426 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2428 const struct net_device *dev,
2429 u32 flags, u32 noflags,
2432 struct fib6_node *fn;
2433 struct fib6_info *rt = NULL;
2434 struct fib6_table *table;
2435 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
2437 table = fib6_get_table(dev_net(dev), tb_id);
2442 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true);
2446 for_each_fib6_node_rt_rcu(fn) {
2447 /* prefix routes only use builtin fib6_nh */
2451 if (rt->fib6_nh->fib_nh_dev->ifindex != dev->ifindex)
2453 if (no_gw && rt->fib6_nh->fib_nh_gw_family)
2455 if ((rt->fib6_flags & flags) != flags)
2457 if ((rt->fib6_flags & noflags) != 0)
2459 if (!fib6_info_hold_safe(rt))
2469 /* Create "default" multicast route to the interface */
2471 static void addrconf_add_mroute(struct net_device *dev)
2473 struct fib6_config cfg = {
2474 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2475 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2476 .fc_ifindex = dev->ifindex,
2479 .fc_type = RTN_MULTICAST,
2480 .fc_nlinfo.nl_net = dev_net(dev),
2481 .fc_protocol = RTPROT_KERNEL,
2484 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2486 ip6_route_add(&cfg, GFP_KERNEL, NULL);
2489 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2491 struct inet6_dev *idev;
2495 idev = ipv6_find_idev(dev);
2499 if (idev->cnf.disable_ipv6)
2500 return ERR_PTR(-EACCES);
2502 /* Add default multicast route */
2503 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
2504 addrconf_add_mroute(dev);
2509 static void manage_tempaddrs(struct inet6_dev *idev,
2510 struct inet6_ifaddr *ifp,
2511 __u32 valid_lft, __u32 prefered_lft,
2512 bool create, unsigned long now)
2515 struct inet6_ifaddr *ift;
2517 read_lock_bh(&idev->lock);
2518 /* update all temporary addresses in the list */
2519 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2520 int age, max_valid, max_prefered;
2522 if (ifp != ift->ifpub)
2525 /* RFC 4941 section 3.3:
2526 * If a received option will extend the lifetime of a public
2527 * address, the lifetimes of temporary addresses should
2528 * be extended, subject to the overall constraint that no
2529 * temporary addresses should ever remain "valid" or "preferred"
2530 * for a time longer than (TEMP_VALID_LIFETIME) or
2531 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2533 age = (now - ift->cstamp) / HZ;
2534 max_valid = idev->cnf.temp_valid_lft - age;
2538 max_prefered = idev->cnf.temp_prefered_lft -
2539 idev->desync_factor - age;
2540 if (max_prefered < 0)
2543 if (valid_lft > max_valid)
2544 valid_lft = max_valid;
2546 if (prefered_lft > max_prefered)
2547 prefered_lft = max_prefered;
2549 spin_lock(&ift->lock);
2551 ift->valid_lft = valid_lft;
2552 ift->prefered_lft = prefered_lft;
2554 if (prefered_lft > 0)
2555 ift->flags &= ~IFA_F_DEPRECATED;
2557 spin_unlock(&ift->lock);
2558 if (!(flags&IFA_F_TENTATIVE))
2559 ipv6_ifa_notify(0, ift);
2562 if ((create || list_empty(&idev->tempaddr_list)) &&
2563 idev->cnf.use_tempaddr > 0) {
2564 /* When a new public address is created as described
2565 * in [ADDRCONF], also create a new temporary address.
2566 * Also create a temporary address if it's enabled but
2567 * no temporary address currently exists.
2569 read_unlock_bh(&idev->lock);
2570 ipv6_create_tempaddr(ifp, false);
2572 read_unlock_bh(&idev->lock);
2576 static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2578 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2579 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2582 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2583 const struct prefix_info *pinfo,
2584 struct inet6_dev *in6_dev,
2585 const struct in6_addr *addr, int addr_type,
2586 u32 addr_flags, bool sllao, bool tokenized,
2587 __u32 valid_lft, u32 prefered_lft)
2589 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2592 if (!ifp && valid_lft) {
2593 int max_addresses = in6_dev->cnf.max_addresses;
2594 struct ifa6_config cfg = {
2596 .plen = pinfo->prefix_len,
2597 .ifa_flags = addr_flags,
2598 .valid_lft = valid_lft,
2599 .preferred_lft = prefered_lft,
2600 .scope = addr_type & IPV6_ADDR_SCOPE_MASK,
2603 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2604 if ((net->ipv6.devconf_all->optimistic_dad ||
2605 in6_dev->cnf.optimistic_dad) &&
2606 !net->ipv6.devconf_all->forwarding && sllao)
2607 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
2610 /* Do not allow to create too much of autoconfigured
2611 * addresses; this would be too easy way to crash kernel.
2613 if (!max_addresses ||
2614 ipv6_count_addresses(in6_dev) < max_addresses)
2615 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL);
2617 if (IS_ERR_OR_NULL(ifp))
2621 spin_lock_bh(&ifp->lock);
2622 ifp->flags |= IFA_F_MANAGETEMPADDR;
2623 ifp->cstamp = jiffies;
2624 ifp->tokenized = tokenized;
2625 spin_unlock_bh(&ifp->lock);
2626 addrconf_dad_start(ifp);
2634 /* Update lifetime (RFC4862 5.5.3 e)
2635 * We deviate from RFC4862 by honoring all Valid Lifetimes to
2636 * improve the reaction of SLAAC to renumbering events
2637 * (draft-gont-6man-slaac-renum-06, Section 4.2)
2639 spin_lock_bh(&ifp->lock);
2641 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2642 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2646 if (!create && stored_lft) {
2647 ifp->valid_lft = valid_lft;
2648 ifp->prefered_lft = prefered_lft;
2651 ifp->flags &= ~IFA_F_DEPRECATED;
2652 spin_unlock_bh(&ifp->lock);
2654 if (!(flags&IFA_F_TENTATIVE))
2655 ipv6_ifa_notify(0, ifp);
2657 spin_unlock_bh(&ifp->lock);
2659 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2668 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
2670 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2672 struct prefix_info *pinfo;
2677 struct inet6_dev *in6_dev;
2678 struct net *net = dev_net(dev);
2680 pinfo = (struct prefix_info *) opt;
2682 if (len < sizeof(struct prefix_info)) {
2683 netdev_dbg(dev, "addrconf: prefix option too short\n");
2688 * Validation checks ([ADDRCONF], page 19)
2691 addr_type = ipv6_addr_type(&pinfo->prefix);
2693 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2696 valid_lft = ntohl(pinfo->valid);
2697 prefered_lft = ntohl(pinfo->prefered);
2699 if (prefered_lft > valid_lft) {
2700 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2704 in6_dev = in6_dev_get(dev);
2707 net_dbg_ratelimited("addrconf: device %s not configured\n",
2713 * Two things going on here:
2714 * 1) Add routes for on-link prefixes
2715 * 2) Configure prefixes with the auto flag set
2718 if (pinfo->onlink) {
2719 struct fib6_info *rt;
2720 unsigned long rt_expires;
2722 /* Avoid arithmetic overflow. Really, we could
2723 * save rt_expires in seconds, likely valid_lft,
2724 * but it would require division in fib gc, that it
2728 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2730 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2732 if (addrconf_finite_timeout(rt_expires))
2735 rt = addrconf_get_prefix_route(&pinfo->prefix,
2738 RTF_ADDRCONF | RTF_PREFIX_RT,
2742 /* Autoconf prefix route */
2743 if (valid_lft == 0) {
2744 ip6_del_rt(net, rt, false);
2746 } else if (addrconf_finite_timeout(rt_expires)) {
2748 fib6_set_expires(rt, jiffies + rt_expires);
2750 fib6_clean_expires(rt);
2752 } else if (valid_lft) {
2753 clock_t expires = 0;
2754 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2755 if (addrconf_finite_timeout(rt_expires)) {
2757 flags |= RTF_EXPIRES;
2758 expires = jiffies_to_clock_t(rt_expires);
2760 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2761 0, dev, expires, flags,
2764 fib6_info_release(rt);
2767 /* Try to figure out our local address for this prefix */
2769 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2770 struct in6_addr addr;
2771 bool tokenized = false, dev_addr_generated = false;
2773 if (pinfo->prefix_len == 64) {
2774 memcpy(&addr, &pinfo->prefix, 8);
2776 if (!ipv6_addr_any(&in6_dev->token)) {
2777 read_lock_bh(&in6_dev->lock);
2778 memcpy(addr.s6_addr + 8,
2779 in6_dev->token.s6_addr + 8, 8);
2780 read_unlock_bh(&in6_dev->lock);
2782 } else if (is_addr_mode_generate_stable(in6_dev) &&
2783 !ipv6_generate_stable_address(&addr, 0,
2785 addr_flags |= IFA_F_STABLE_PRIVACY;
2787 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2788 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2791 dev_addr_generated = true;
2795 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2800 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2803 tokenized, valid_lft,
2808 /* Ignore error case here because previous prefix add addr was
2809 * successful which will be notified.
2811 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2812 addr_type, addr_flags, sllao,
2813 tokenized, valid_lft,
2815 dev_addr_generated);
2817 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2819 in6_dev_put(in6_dev);
2822 static int addrconf_set_sit_dstaddr(struct net *net, struct net_device *dev,
2823 struct in6_ifreq *ireq)
2825 struct ip_tunnel_parm p = { };
2828 if (!(ipv6_addr_type(&ireq->ifr6_addr) & IPV6_ADDR_COMPATv4))
2829 return -EADDRNOTAVAIL;
2831 p.iph.daddr = ireq->ifr6_addr.s6_addr32[3];
2834 p.iph.protocol = IPPROTO_IPV6;
2837 if (!dev->netdev_ops->ndo_tunnel_ctl)
2839 err = dev->netdev_ops->ndo_tunnel_ctl(dev, &p, SIOCADDTUNNEL);
2843 dev = __dev_get_by_name(net, p.name);
2846 return dev_open(dev, NULL);
2850 * Set destination address.
2851 * Special case for SIT interfaces where we create a new "virtual"
2854 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2856 struct net_device *dev;
2857 struct in6_ifreq ireq;
2860 if (!IS_ENABLED(CONFIG_IPV6_SIT))
2862 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2866 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2867 if (dev && dev->type == ARPHRD_SIT)
2868 err = addrconf_set_sit_dstaddr(net, dev, &ireq);
2873 static int ipv6_mc_config(struct sock *sk, bool join,
2874 const struct in6_addr *addr, int ifindex)
2882 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2884 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2891 * Manual configuration of address on an interface
2893 static int inet6_addr_add(struct net *net, int ifindex,
2894 struct ifa6_config *cfg,
2895 struct netlink_ext_ack *extack)
2897 struct inet6_ifaddr *ifp;
2898 struct inet6_dev *idev;
2899 struct net_device *dev;
2900 unsigned long timeout;
2906 if (cfg->plen > 128)
2909 /* check the lifetime */
2910 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
2913 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64)
2916 dev = __dev_get_by_index(net, ifindex);
2920 idev = addrconf_add_dev(dev);
2922 return PTR_ERR(idev);
2924 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
2925 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2926 true, cfg->pfx, ifindex);
2932 cfg->scope = ipv6_addr_scope(cfg->pfx);
2934 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
2935 if (addrconf_finite_timeout(timeout)) {
2936 expires = jiffies_to_clock_t(timeout * HZ);
2937 cfg->valid_lft = timeout;
2938 flags = RTF_EXPIRES;
2942 cfg->ifa_flags |= IFA_F_PERMANENT;
2945 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
2946 if (addrconf_finite_timeout(timeout)) {
2948 cfg->ifa_flags |= IFA_F_DEPRECATED;
2949 cfg->preferred_lft = timeout;
2952 ifp = ipv6_add_addr(idev, cfg, true, extack);
2954 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
2955 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
2956 ifp->rt_priority, dev, expires,
2960 /* Send a netlink notification if DAD is enabled and
2961 * optimistic flag is not set
2963 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD)))
2964 ipv6_ifa_notify(0, ifp);
2966 * Note that section 3.1 of RFC 4429 indicates
2967 * that the Optimistic flag should not be set for
2968 * manually configured addresses
2970 addrconf_dad_start(ifp);
2971 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR)
2972 manage_tempaddrs(idev, ifp, cfg->valid_lft,
2973 cfg->preferred_lft, true, jiffies);
2975 addrconf_verify_rtnl();
2977 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
2978 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false,
2982 return PTR_ERR(ifp);
2985 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2986 const struct in6_addr *pfx, unsigned int plen)
2988 struct inet6_ifaddr *ifp;
2989 struct inet6_dev *idev;
2990 struct net_device *dev;
2995 dev = __dev_get_by_index(net, ifindex);
2999 idev = __in6_dev_get(dev);
3003 read_lock_bh(&idev->lock);
3004 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3005 if (ifp->prefix_len == plen &&
3006 ipv6_addr_equal(pfx, &ifp->addr)) {
3008 read_unlock_bh(&idev->lock);
3010 if (!(ifp->flags & IFA_F_TEMPORARY) &&
3011 (ifa_flags & IFA_F_MANAGETEMPADDR))
3012 manage_tempaddrs(idev, ifp, 0, 0, false,
3015 addrconf_verify_rtnl();
3016 if (ipv6_addr_is_multicast(pfx)) {
3017 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
3018 false, pfx, dev->ifindex);
3023 read_unlock_bh(&idev->lock);
3024 return -EADDRNOTAVAIL;
3028 int addrconf_add_ifaddr(struct net *net, void __user *arg)
3030 struct ifa6_config cfg = {
3031 .ifa_flags = IFA_F_PERMANENT,
3032 .preferred_lft = INFINITY_LIFE_TIME,
3033 .valid_lft = INFINITY_LIFE_TIME,
3035 struct in6_ifreq ireq;
3038 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3041 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3044 cfg.pfx = &ireq.ifr6_addr;
3045 cfg.plen = ireq.ifr6_prefixlen;
3048 err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL);
3053 int addrconf_del_ifaddr(struct net *net, void __user *arg)
3055 struct in6_ifreq ireq;
3058 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3061 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3065 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
3066 ireq.ifr6_prefixlen);
3071 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
3072 int plen, int scope)
3074 struct inet6_ifaddr *ifp;
3075 struct ifa6_config cfg = {
3078 .ifa_flags = IFA_F_PERMANENT,
3079 .valid_lft = INFINITY_LIFE_TIME,
3080 .preferred_lft = INFINITY_LIFE_TIME,
3084 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
3086 spin_lock_bh(&ifp->lock);
3087 ifp->flags &= ~IFA_F_TENTATIVE;
3088 spin_unlock_bh(&ifp->lock);
3089 rt_genid_bump_ipv6(dev_net(idev->dev));
3090 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3095 #if IS_ENABLED(CONFIG_IPV6_SIT)
3096 static void sit_add_v4_addrs(struct inet6_dev *idev)
3098 struct in6_addr addr;
3099 struct net_device *dev;
3100 struct net *net = dev_net(idev->dev);
3106 memset(&addr, 0, sizeof(struct in6_addr));
3107 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
3109 if (idev->dev->flags&IFF_POINTOPOINT) {
3110 addr.s6_addr32[0] = htonl(0xfe800000);
3114 scope = IPV6_ADDR_COMPATv4;
3116 pflags |= RTF_NONEXTHOP;
3119 if (addr.s6_addr32[3]) {
3120 add_addr(idev, &addr, plen, scope);
3121 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags,
3126 for_each_netdev(net, dev) {
3127 struct in_device *in_dev = __in_dev_get_rtnl(dev);
3128 if (in_dev && (dev->flags & IFF_UP)) {
3129 struct in_ifaddr *ifa;
3132 in_dev_for_each_ifa_rtnl(ifa, in_dev) {
3133 addr.s6_addr32[3] = ifa->ifa_local;
3135 if (ifa->ifa_scope == RT_SCOPE_LINK)
3137 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
3138 if (idev->dev->flags&IFF_POINTOPOINT)
3143 add_addr(idev, &addr, plen, flag);
3144 addrconf_prefix_route(&addr, plen, 0, idev->dev,
3145 0, pflags, GFP_KERNEL);
3152 static void init_loopback(struct net_device *dev)
3154 struct inet6_dev *idev;
3160 idev = ipv6_find_idev(dev);
3162 pr_debug("%s: add_dev failed\n", __func__);
3166 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
3169 void addrconf_add_linklocal(struct inet6_dev *idev,
3170 const struct in6_addr *addr, u32 flags)
3172 struct ifa6_config cfg = {
3175 .ifa_flags = flags | IFA_F_PERMANENT,
3176 .valid_lft = INFINITY_LIFE_TIME,
3177 .preferred_lft = INFINITY_LIFE_TIME,
3180 struct inet6_ifaddr *ifp;
3182 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3183 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad ||
3184 idev->cnf.optimistic_dad) &&
3185 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
3186 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
3189 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
3191 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev,
3193 addrconf_dad_start(ifp);
3197 EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
3199 static bool ipv6_reserved_interfaceid(struct in6_addr address)
3201 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3204 if (address.s6_addr32[2] == htonl(0x02005eff) &&
3205 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3208 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3209 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3215 static int ipv6_generate_stable_address(struct in6_addr *address,
3217 const struct inet6_dev *idev)
3219 static DEFINE_SPINLOCK(lock);
3220 static __u32 digest[SHA1_DIGEST_WORDS];
3221 static __u32 workspace[SHA1_WORKSPACE_WORDS];
3224 char __data[SHA1_BLOCK_SIZE];
3226 struct in6_addr secret;
3228 unsigned char hwaddr[MAX_ADDR_LEN];
3233 struct in6_addr secret;
3234 struct in6_addr temp;
3235 struct net *net = dev_net(idev->dev);
3237 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3239 if (idev->cnf.stable_secret.initialized)
3240 secret = idev->cnf.stable_secret.secret;
3241 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3242 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3247 spin_lock_bh(&lock);
3250 memset(&data, 0, sizeof(data));
3251 memset(workspace, 0, sizeof(workspace));
3252 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3253 data.prefix[0] = address->s6_addr32[0];
3254 data.prefix[1] = address->s6_addr32[1];
3255 data.secret = secret;
3256 data.dad_count = dad_count;
3258 sha1_transform(digest, data.__data, workspace);
3261 temp.s6_addr32[2] = (__force __be32)digest[0];
3262 temp.s6_addr32[3] = (__force __be32)digest[1];
3264 spin_unlock_bh(&lock);
3266 if (ipv6_reserved_interfaceid(temp)) {
3268 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3277 static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3279 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3283 s = &idev->cnf.stable_secret;
3284 get_random_bytes(&s->secret, sizeof(s->secret));
3285 s->initialized = true;
3288 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3290 struct in6_addr addr;
3292 /* no link local addresses on L3 master devices */
3293 if (netif_is_l3_master(idev->dev))
3296 /* no link local addresses on devices flagged as slaves */
3297 if (idev->dev->flags & IFF_SLAVE)
3300 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3302 switch (idev->cnf.addr_gen_mode) {
3303 case IN6_ADDR_GEN_MODE_RANDOM:
3304 ipv6_gen_mode_random_init(idev);
3306 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
3307 if (!ipv6_generate_stable_address(&addr, 0, idev))
3308 addrconf_add_linklocal(idev, &addr,
3309 IFA_F_STABLE_PRIVACY);
3310 else if (prefix_route)
3311 addrconf_prefix_route(&addr, 64, 0, idev->dev,
3314 case IN6_ADDR_GEN_MODE_EUI64:
3315 /* addrconf_add_linklocal also adds a prefix_route and we
3316 * only need to care about prefix routes if ipv6_generate_eui64
3317 * couldn't generate one.
3319 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3320 addrconf_add_linklocal(idev, &addr, 0);
3321 else if (prefix_route)
3322 addrconf_prefix_route(&addr, 64, 0, idev->dev,
3325 case IN6_ADDR_GEN_MODE_NONE:
3327 /* will not add any link local address */
3332 static void addrconf_dev_config(struct net_device *dev)
3334 struct inet6_dev *idev;
3338 if ((dev->type != ARPHRD_ETHER) &&
3339 (dev->type != ARPHRD_FDDI) &&
3340 (dev->type != ARPHRD_ARCNET) &&
3341 (dev->type != ARPHRD_INFINIBAND) &&
3342 (dev->type != ARPHRD_IEEE1394) &&
3343 (dev->type != ARPHRD_TUNNEL6) &&
3344 (dev->type != ARPHRD_6LOWPAN) &&
3345 (dev->type != ARPHRD_IP6GRE) &&
3346 (dev->type != ARPHRD_IPGRE) &&
3347 (dev->type != ARPHRD_TUNNEL) &&
3348 (dev->type != ARPHRD_NONE) &&
3349 (dev->type != ARPHRD_RAWIP)) {
3350 /* Alas, we support only Ethernet autoconfiguration. */
3351 idev = __in6_dev_get(dev);
3352 if (!IS_ERR_OR_NULL(idev) && dev->flags & IFF_UP &&
3353 dev->flags & IFF_MULTICAST)
3358 idev = addrconf_add_dev(dev);
3362 /* this device type has no EUI support */
3363 if (dev->type == ARPHRD_NONE &&
3364 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3365 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
3367 addrconf_addr_gen(idev, false);
3370 #if IS_ENABLED(CONFIG_IPV6_SIT)
3371 static void addrconf_sit_config(struct net_device *dev)
3373 struct inet6_dev *idev;
3378 * Configure the tunnel with one of our IPv4
3379 * addresses... we should configure all of
3380 * our v4 addrs in the tunnel
3383 idev = ipv6_find_idev(dev);
3385 pr_debug("%s: add_dev failed\n", __func__);
3389 if (dev->priv_flags & IFF_ISATAP) {
3390 addrconf_addr_gen(idev, false);
3394 sit_add_v4_addrs(idev);
3396 if (dev->flags&IFF_POINTOPOINT)
3397 addrconf_add_mroute(dev);
3401 #if IS_ENABLED(CONFIG_NET_IPGRE)
3402 static void addrconf_gre_config(struct net_device *dev)
3404 struct inet6_dev *idev;
3408 idev = ipv6_find_idev(dev);
3410 pr_debug("%s: add_dev failed\n", __func__);
3414 addrconf_addr_gen(idev, true);
3415 if (dev->flags & IFF_POINTOPOINT)
3416 addrconf_add_mroute(dev);
3420 static int fixup_permanent_addr(struct net *net,
3421 struct inet6_dev *idev,
3422 struct inet6_ifaddr *ifp)
3424 /* !fib6_node means the host route was removed from the
3425 * FIB, for example, if 'lo' device is taken down. In that
3426 * case regenerate the host route.
3428 if (!ifp->rt || !ifp->rt->fib6_node) {
3429 struct fib6_info *f6i, *prev;
3431 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false,
3434 return PTR_ERR(f6i);
3436 /* ifp->rt can be accessed outside of rtnl */
3437 spin_lock(&ifp->lock);
3440 spin_unlock(&ifp->lock);
3442 fib6_info_release(prev);
3445 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3446 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3447 ifp->rt_priority, idev->dev, 0, 0,
3451 if (ifp->state == INET6_IFADDR_STATE_PREDAD)
3452 addrconf_dad_start(ifp);
3457 static void addrconf_permanent_addr(struct net *net, struct net_device *dev)
3459 struct inet6_ifaddr *ifp, *tmp;
3460 struct inet6_dev *idev;
3462 idev = __in6_dev_get(dev);
3466 write_lock_bh(&idev->lock);
3468 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3469 if ((ifp->flags & IFA_F_PERMANENT) &&
3470 fixup_permanent_addr(net, idev, ifp) < 0) {
3471 write_unlock_bh(&idev->lock);
3474 write_lock_bh(&idev->lock);
3476 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3477 idev->dev->name, &ifp->addr);
3481 write_unlock_bh(&idev->lock);
3484 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3487 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3488 struct netdev_notifier_change_info *change_info;
3489 struct netdev_notifier_changeupper_info *info;
3490 struct inet6_dev *idev = __in6_dev_get(dev);
3491 struct net *net = dev_net(dev);
3492 int run_pending = 0;
3496 case NETDEV_REGISTER:
3497 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3498 idev = ipv6_add_dev(dev);
3500 return notifier_from_errno(PTR_ERR(idev));
3504 case NETDEV_CHANGEMTU:
3505 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3506 if (dev->mtu < IPV6_MIN_MTU) {
3507 addrconf_ifdown(dev, dev != net->loopback_dev);
3512 rt6_mtu_change(dev, dev->mtu);
3513 idev->cnf.mtu6 = dev->mtu;
3517 /* allocate new idev */
3518 idev = ipv6_add_dev(dev);
3522 /* device is still not ready */
3523 if (!(idev->if_flags & IF_READY))
3530 if (dev->flags & IFF_SLAVE)
3533 if (idev && idev->cnf.disable_ipv6)
3536 if (event == NETDEV_UP) {
3537 /* restore routes for permanent addresses */
3538 addrconf_permanent_addr(net, dev);
3540 if (!addrconf_link_ready(dev)) {
3541 /* device is not ready yet. */
3542 pr_debug("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3547 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3548 idev = ipv6_add_dev(dev);
3550 if (!IS_ERR_OR_NULL(idev)) {
3551 idev->if_flags |= IF_READY;
3554 } else if (event == NETDEV_CHANGE) {
3555 if (!addrconf_link_ready(dev)) {
3556 /* device is still not ready. */
3557 rt6_sync_down_dev(dev, event);
3561 if (!IS_ERR_OR_NULL(idev)) {
3562 if (idev->if_flags & IF_READY) {
3563 /* device is already configured -
3564 * but resend MLD reports, we might
3565 * have roamed and need to update
3566 * multicast snooping switches
3570 if (change_info->flags_changed & IFF_NOARP)
3571 addrconf_dad_run(idev, true);
3572 rt6_sync_up(dev, RTNH_F_LINKDOWN);
3575 idev->if_flags |= IF_READY;
3578 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3584 switch (dev->type) {
3585 #if IS_ENABLED(CONFIG_IPV6_SIT)
3587 addrconf_sit_config(dev);
3590 #if IS_ENABLED(CONFIG_NET_IPGRE)
3592 addrconf_gre_config(dev);
3595 case ARPHRD_LOOPBACK:
3600 addrconf_dev_config(dev);
3604 if (!IS_ERR_OR_NULL(idev)) {
3606 addrconf_dad_run(idev, false);
3608 /* Device has an address by now */
3609 rt6_sync_up(dev, RTNH_F_DEAD);
3612 * If the MTU changed during the interface down,
3613 * when the interface up, the changed MTU must be
3614 * reflected in the idev as well as routers.
3616 if (idev->cnf.mtu6 != dev->mtu &&
3617 dev->mtu >= IPV6_MIN_MTU) {
3618 rt6_mtu_change(dev, dev->mtu);
3619 idev->cnf.mtu6 = dev->mtu;
3621 idev->tstamp = jiffies;
3622 inet6_ifinfo_notify(RTM_NEWLINK, idev);
3625 * If the changed mtu during down is lower than
3626 * IPV6_MIN_MTU stop IPv6 on this interface.
3628 if (dev->mtu < IPV6_MIN_MTU)
3629 addrconf_ifdown(dev, dev != net->loopback_dev);
3634 case NETDEV_UNREGISTER:
3636 * Remove all addresses from this interface.
3638 addrconf_ifdown(dev, event != NETDEV_DOWN);
3641 case NETDEV_CHANGENAME:
3643 snmp6_unregister_dev(idev);
3644 addrconf_sysctl_unregister(idev);
3645 err = addrconf_sysctl_register(idev);
3647 return notifier_from_errno(err);
3648 err = snmp6_register_dev(idev);
3650 addrconf_sysctl_unregister(idev);
3651 return notifier_from_errno(err);
3656 case NETDEV_PRE_TYPE_CHANGE:
3657 case NETDEV_POST_TYPE_CHANGE:
3659 addrconf_type_change(dev, event);
3662 case NETDEV_CHANGEUPPER:
3665 /* flush all routes if dev is linked to or unlinked from
3666 * an L3 master device (e.g., VRF)
3668 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3669 addrconf_ifdown(dev, false);
3676 * addrconf module should be notified of a device going up
3678 static struct notifier_block ipv6_dev_notf = {
3679 .notifier_call = addrconf_notify,
3680 .priority = ADDRCONF_NOTIFY_PRIORITY,
3683 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3685 struct inet6_dev *idev;
3688 idev = __in6_dev_get(dev);
3690 if (event == NETDEV_POST_TYPE_CHANGE)
3691 ipv6_mc_remap(idev);
3692 else if (event == NETDEV_PRE_TYPE_CHANGE)
3693 ipv6_mc_unmap(idev);
3696 static bool addr_is_local(const struct in6_addr *addr)
3698 return ipv6_addr_type(addr) &
3699 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3702 static int addrconf_ifdown(struct net_device *dev, bool unregister)
3704 unsigned long event = unregister ? NETDEV_UNREGISTER : NETDEV_DOWN;
3705 struct net *net = dev_net(dev);
3706 struct inet6_dev *idev;
3707 struct inet6_ifaddr *ifa, *tmp;
3708 bool keep_addr = false;
3713 rt6_disable_ip(dev, event);
3715 idev = __in6_dev_get(dev);
3720 * Step 1: remove reference to ipv6 device from parent device.
3726 /* protected by rtnl_lock */
3727 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3729 /* Step 1.5: remove snmp6 entry */
3730 snmp6_unregister_dev(idev);
3734 /* combine the user config with event to determine if permanent
3735 * addresses are to be removed from address hash table
3737 if (!unregister && !idev->cnf.disable_ipv6) {
3738 /* aggregate the system setting and interface setting */
3739 int _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3742 _keep_addr = idev->cnf.keep_addr_on_down;
3744 keep_addr = (_keep_addr > 0);
3747 /* Step 2: clear hash table */
3748 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3749 struct hlist_head *h = &inet6_addr_lst[i];
3751 spin_lock_bh(&addrconf_hash_lock);
3753 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3754 if (ifa->idev == idev) {
3755 addrconf_del_dad_work(ifa);
3756 /* combined flag + permanent flag decide if
3757 * address is retained on a down event
3760 !(ifa->flags & IFA_F_PERMANENT) ||
3761 addr_is_local(&ifa->addr)) {
3762 hlist_del_init_rcu(&ifa->addr_lst);
3767 spin_unlock_bh(&addrconf_hash_lock);
3770 write_lock_bh(&idev->lock);
3772 addrconf_del_rs_timer(idev);
3774 /* Step 2: clear flags for stateless addrconf */
3776 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3778 /* Step 3: clear tempaddr list */
3779 while (!list_empty(&idev->tempaddr_list)) {
3780 ifa = list_first_entry(&idev->tempaddr_list,
3781 struct inet6_ifaddr, tmp_list);
3782 list_del(&ifa->tmp_list);
3783 write_unlock_bh(&idev->lock);
3784 spin_lock_bh(&ifa->lock);
3787 in6_ifa_put(ifa->ifpub);
3790 spin_unlock_bh(&ifa->lock);
3792 write_lock_bh(&idev->lock);
3795 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
3796 struct fib6_info *rt = NULL;
3799 addrconf_del_dad_work(ifa);
3801 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3802 !addr_is_local(&ifa->addr);
3804 write_unlock_bh(&idev->lock);
3805 spin_lock_bh(&ifa->lock);
3808 /* set state to skip the notifier below */
3809 state = INET6_IFADDR_STATE_DEAD;
3810 ifa->state = INET6_IFADDR_STATE_PREDAD;
3811 if (!(ifa->flags & IFA_F_NODAD))
3812 ifa->flags |= IFA_F_TENTATIVE;
3818 ifa->state = INET6_IFADDR_STATE_DEAD;
3821 spin_unlock_bh(&ifa->lock);
3824 ip6_del_rt(net, rt, false);
3826 if (state != INET6_IFADDR_STATE_DEAD) {
3827 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3828 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3830 if (idev->cnf.forwarding)
3831 addrconf_leave_anycast(ifa);
3832 addrconf_leave_solict(ifa->idev, &ifa->addr);
3835 write_lock_bh(&idev->lock);
3837 list_del_rcu(&ifa->if_list);
3842 write_unlock_bh(&idev->lock);
3844 /* Step 5: Discard anycast and multicast list */
3846 ipv6_ac_destroy_dev(idev);
3847 ipv6_mc_destroy_dev(idev);
3852 idev->tstamp = jiffies;
3855 /* Last: Shot the device (if unregistered) */
3857 addrconf_sysctl_unregister(idev);
3858 neigh_parms_release(&nd_tbl, idev->nd_parms);
3859 neigh_ifdown(&nd_tbl, dev);
3865 static void addrconf_rs_timer(struct timer_list *t)
3867 struct inet6_dev *idev = from_timer(idev, t, rs_timer);
3868 struct net_device *dev = idev->dev;
3869 struct in6_addr lladdr;
3871 write_lock(&idev->lock);
3872 if (idev->dead || !(idev->if_flags & IF_READY))
3875 if (!ipv6_accept_ra(idev))
3878 /* Announcement received after solicitation was sent */
3879 if (idev->if_flags & IF_RA_RCVD)
3882 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
3883 write_unlock(&idev->lock);
3884 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3885 ndisc_send_rs(dev, &lladdr,
3886 &in6addr_linklocal_allrouters);
3890 write_lock(&idev->lock);
3891 idev->rs_interval = rfc3315_s14_backoff_update(
3892 idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
3893 /* The wait after the last probe can be shorter */
3894 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3895 idev->cnf.rtr_solicits) ?
3896 idev->cnf.rtr_solicit_delay :
3900 * Note: we do not support deprecated "all on-link"
3901 * assumption any longer.
3903 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3907 write_unlock(&idev->lock);
3913 * Duplicate Address Detection
3915 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3917 unsigned long rand_num;
3918 struct inet6_dev *idev = ifp->idev;
3921 if (ifp->flags & IFA_F_OPTIMISTIC)
3924 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3927 if (idev->cnf.enhanced_dad ||
3928 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) {
3930 get_random_bytes(&nonce, 6);
3933 ifp->dad_nonce = nonce;
3934 ifp->dad_probes = idev->cnf.dad_transmits;
3935 addrconf_mod_dad_work(ifp, rand_num);
3938 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3940 struct inet6_dev *idev = ifp->idev;
3941 struct net_device *dev = idev->dev;
3942 bool bump_id, notify = false;
3945 addrconf_join_solict(dev, &ifp->addr);
3947 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3949 read_lock_bh(&idev->lock);
3950 spin_lock(&ifp->lock);
3951 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3955 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3956 (net->ipv6.devconf_all->accept_dad < 1 &&
3957 idev->cnf.accept_dad < 1) ||
3958 !(ifp->flags&IFA_F_TENTATIVE) ||
3959 ifp->flags & IFA_F_NODAD) {
3960 bool send_na = false;
3962 if (ifp->flags & IFA_F_TENTATIVE &&
3963 !(ifp->flags & IFA_F_OPTIMISTIC))
3965 bump_id = ifp->flags & IFA_F_TENTATIVE;
3966 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3967 spin_unlock(&ifp->lock);
3968 read_unlock_bh(&idev->lock);
3970 addrconf_dad_completed(ifp, bump_id, send_na);
3974 if (!(idev->if_flags & IF_READY)) {
3975 spin_unlock(&ifp->lock);
3976 read_unlock_bh(&idev->lock);
3978 * If the device is not ready:
3979 * - keep it tentative if it is a permanent address.
3980 * - otherwise, kill it.
3983 addrconf_dad_stop(ifp, 0);
3988 * Optimistic nodes can start receiving
3991 if (ifp->flags & IFA_F_OPTIMISTIC) {
3992 ip6_ins_rt(net, ifp->rt);
3993 if (ipv6_use_optimistic_addr(net, idev)) {
3994 /* Because optimistic nodes can use this address,
3995 * notify listeners. If DAD fails, RTM_DELADDR is sent.
4001 addrconf_dad_kick(ifp);
4003 spin_unlock(&ifp->lock);
4004 read_unlock_bh(&idev->lock);
4006 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4009 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
4011 bool begin_dad = false;
4013 spin_lock_bh(&ifp->lock);
4014 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
4015 ifp->state = INET6_IFADDR_STATE_PREDAD;
4018 spin_unlock_bh(&ifp->lock);
4021 addrconf_mod_dad_work(ifp, 0);
4024 static void addrconf_dad_work(struct work_struct *w)
4026 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
4027 struct inet6_ifaddr,
4029 struct inet6_dev *idev = ifp->idev;
4030 bool bump_id, disable_ipv6 = false;
4031 struct in6_addr mcaddr;
4037 } action = DAD_PROCESS;
4041 spin_lock_bh(&ifp->lock);
4042 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
4044 ifp->state = INET6_IFADDR_STATE_DAD;
4045 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
4047 ifp->state = INET6_IFADDR_STATE_POSTDAD;
4049 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 ||
4050 idev->cnf.accept_dad > 1) &&
4051 !idev->cnf.disable_ipv6 &&
4052 !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
4053 struct in6_addr addr;
4055 addr.s6_addr32[0] = htonl(0xfe800000);
4056 addr.s6_addr32[1] = 0;
4058 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
4059 ipv6_addr_equal(&ifp->addr, &addr)) {
4060 /* DAD failed for link-local based on MAC */
4061 idev->cnf.disable_ipv6 = 1;
4063 pr_info("%s: IPv6 being disabled!\n",
4064 ifp->idev->dev->name);
4065 disable_ipv6 = true;
4069 spin_unlock_bh(&ifp->lock);
4071 if (action == DAD_BEGIN) {
4072 addrconf_dad_begin(ifp);
4074 } else if (action == DAD_ABORT) {
4076 addrconf_dad_stop(ifp, 1);
4078 addrconf_ifdown(idev->dev, false);
4082 if (!ifp->dad_probes && addrconf_dad_end(ifp))
4085 write_lock_bh(&idev->lock);
4086 if (idev->dead || !(idev->if_flags & IF_READY)) {
4087 write_unlock_bh(&idev->lock);
4091 spin_lock(&ifp->lock);
4092 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
4093 spin_unlock(&ifp->lock);
4094 write_unlock_bh(&idev->lock);
4098 if (ifp->dad_probes == 0) {
4099 bool send_na = false;
4102 * DAD was successful
4105 if (ifp->flags & IFA_F_TENTATIVE &&
4106 !(ifp->flags & IFA_F_OPTIMISTIC))
4108 bump_id = ifp->flags & IFA_F_TENTATIVE;
4109 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
4110 spin_unlock(&ifp->lock);
4111 write_unlock_bh(&idev->lock);
4113 addrconf_dad_completed(ifp, bump_id, send_na);
4119 addrconf_mod_dad_work(ifp,
4120 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME),
4122 spin_unlock(&ifp->lock);
4123 write_unlock_bh(&idev->lock);
4125 /* send a neighbour solicitation for our addr */
4126 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
4127 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
4134 /* ifp->idev must be at least read locked */
4135 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
4137 struct inet6_ifaddr *ifpiter;
4138 struct inet6_dev *idev = ifp->idev;
4140 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
4141 if (ifpiter->scope > IFA_LINK)
4143 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
4144 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
4145 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
4152 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
4155 struct net_device *dev = ifp->idev->dev;
4156 struct in6_addr lladdr;
4157 bool send_rs, send_mld;
4159 addrconf_del_dad_work(ifp);
4162 * Configure the address for reception. Now it is valid.
4165 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4167 /* If added prefix is link local and we are prepared to process
4168 router advertisements, start sending router solicitations.
4171 read_lock_bh(&ifp->idev->lock);
4172 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
4173 send_rs = send_mld &&
4174 ipv6_accept_ra(ifp->idev) &&
4175 ifp->idev->cnf.rtr_solicits != 0 &&
4176 (dev->flags&IFF_LOOPBACK) == 0;
4177 read_unlock_bh(&ifp->idev->lock);
4179 /* While dad is in progress mld report's source address is in6_addrany.
4180 * Resend with proper ll now.
4183 ipv6_mc_dad_complete(ifp->idev);
4185 /* send unsolicited NA if enabled */
4187 (ifp->idev->cnf.ndisc_notify ||
4188 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) {
4189 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr,
4190 /*router=*/ !!ifp->idev->cnf.forwarding,
4191 /*solicited=*/ false, /*override=*/ true,
4197 * If a host as already performed a random delay
4198 * [...] as part of DAD [...] there is no need
4199 * to delay again before sending the first RS
4201 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
4203 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
4205 write_lock_bh(&ifp->idev->lock);
4206 spin_lock(&ifp->lock);
4207 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4208 ifp->idev->cnf.rtr_solicit_interval);
4209 ifp->idev->rs_probes = 1;
4210 ifp->idev->if_flags |= IF_RS_SENT;
4211 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
4212 spin_unlock(&ifp->lock);
4213 write_unlock_bh(&ifp->idev->lock);
4217 rt_genid_bump_ipv6(dev_net(dev));
4219 /* Make sure that a new temporary address will be created
4220 * before this temporary address becomes deprecated.
4222 if (ifp->flags & IFA_F_TEMPORARY)
4223 addrconf_verify_rtnl();
4226 static void addrconf_dad_run(struct inet6_dev *idev, bool restart)
4228 struct inet6_ifaddr *ifp;
4230 read_lock_bh(&idev->lock);
4231 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4232 spin_lock(&ifp->lock);
4233 if ((ifp->flags & IFA_F_TENTATIVE &&
4234 ifp->state == INET6_IFADDR_STATE_DAD) || restart) {
4236 ifp->state = INET6_IFADDR_STATE_PREDAD;
4237 addrconf_dad_kick(ifp);
4239 spin_unlock(&ifp->lock);
4241 read_unlock_bh(&idev->lock);
4244 #ifdef CONFIG_PROC_FS
4245 struct if6_iter_state {
4246 struct seq_net_private p;
4251 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
4253 struct if6_iter_state *state = seq->private;
4254 struct net *net = seq_file_net(seq);
4255 struct inet6_ifaddr *ifa = NULL;
4258 /* initial bucket if pos is 0 */
4264 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
4265 hlist_for_each_entry_rcu(ifa, &inet6_addr_lst[state->bucket],
4267 if (!net_eq(dev_net(ifa->idev->dev), net))
4269 /* sync with offset */
4270 if (p < state->offset) {
4277 /* prepare for next bucket */
4284 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4285 struct inet6_ifaddr *ifa)
4287 struct if6_iter_state *state = seq->private;
4288 struct net *net = seq_file_net(seq);
4290 hlist_for_each_entry_continue_rcu(ifa, addr_lst) {
4291 if (!net_eq(dev_net(ifa->idev->dev), net))
4298 while (++state->bucket < IN6_ADDR_HSIZE) {
4299 hlist_for_each_entry_rcu(ifa,
4300 &inet6_addr_lst[state->bucket], addr_lst) {
4301 if (!net_eq(dev_net(ifa->idev->dev), net))
4310 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4314 return if6_get_first(seq, *pos);
4317 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4319 struct inet6_ifaddr *ifa;
4321 ifa = if6_get_next(seq, v);
4326 static void if6_seq_stop(struct seq_file *seq, void *v)
4332 static int if6_seq_show(struct seq_file *seq, void *v)
4334 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4335 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
4337 ifp->idev->dev->ifindex,
4341 ifp->idev->dev->name);
4345 static const struct seq_operations if6_seq_ops = {
4346 .start = if6_seq_start,
4347 .next = if6_seq_next,
4348 .show = if6_seq_show,
4349 .stop = if6_seq_stop,
4352 static int __net_init if6_proc_net_init(struct net *net)
4354 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops,
4355 sizeof(struct if6_iter_state)))
4360 static void __net_exit if6_proc_net_exit(struct net *net)
4362 remove_proc_entry("if_inet6", net->proc_net);
4365 static struct pernet_operations if6_proc_net_ops = {
4366 .init = if6_proc_net_init,
4367 .exit = if6_proc_net_exit,
4370 int __init if6_proc_init(void)
4372 return register_pernet_subsys(&if6_proc_net_ops);
4375 void if6_proc_exit(void)
4377 unregister_pernet_subsys(&if6_proc_net_ops);
4379 #endif /* CONFIG_PROC_FS */
4381 #if IS_ENABLED(CONFIG_IPV6_MIP6)
4382 /* Check if address is a home address configured on any interface. */
4383 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
4385 unsigned int hash = inet6_addr_hash(net, addr);
4386 struct inet6_ifaddr *ifp = NULL;
4390 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
4391 if (!net_eq(dev_net(ifp->idev->dev), net))
4393 if (ipv6_addr_equal(&ifp->addr, addr) &&
4394 (ifp->flags & IFA_F_HOMEADDRESS)) {
4404 /* RFC6554 has some algorithm to avoid loops in segment routing by
4405 * checking if the segments contains any of a local interface address.
4409 * To detect loops in the SRH, a router MUST determine if the SRH
4410 * includes multiple addresses assigned to any interface on that router.
4411 * If such addresses appear more than once and are separated by at least
4412 * one address not assigned to that router.
4414 int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs,
4415 unsigned char nsegs)
4417 const struct in6_addr *addr;
4418 int i, ret = 0, found = 0;
4419 struct inet6_ifaddr *ifp;
4420 bool separated = false;
4425 for (i = 0; i < nsegs; i++) {
4427 hash = inet6_addr_hash(net, addr);
4430 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
4431 if (!net_eq(dev_net(ifp->idev->dev), net))
4434 if (ipv6_addr_equal(&ifp->addr, addr)) {
4441 if (found > 1 && separated) {
4458 * Periodic address status verification
4461 static void addrconf_verify_rtnl(void)
4463 unsigned long now, next, next_sec, next_sched;
4464 struct inet6_ifaddr *ifp;
4471 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
4473 cancel_delayed_work(&addr_chk_work);
4475 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
4477 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
4480 /* When setting preferred_lft to a value not zero or
4481 * infinity, while valid_lft is infinity
4482 * IFA_F_PERMANENT has a non-infinity life time.
4484 if ((ifp->flags & IFA_F_PERMANENT) &&
4485 (ifp->prefered_lft == INFINITY_LIFE_TIME))
4488 spin_lock(&ifp->lock);
4489 /* We try to batch several events at once. */
4490 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
4492 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4493 age >= ifp->valid_lft) {
4494 spin_unlock(&ifp->lock);
4496 rcu_read_unlock_bh();
4500 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4501 spin_unlock(&ifp->lock);
4503 } else if (age >= ifp->prefered_lft) {
4504 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
4507 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4509 ifp->flags |= IFA_F_DEPRECATED;
4512 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4513 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
4514 next = ifp->tstamp + ifp->valid_lft * HZ;
4516 spin_unlock(&ifp->lock);
4521 ipv6_ifa_notify(0, ifp);
4525 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4526 !(ifp->flags&IFA_F_TENTATIVE)) {
4527 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4528 ifp->idev->cnf.dad_transmits *
4529 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME), HZ/100) / HZ;
4531 if (age >= ifp->prefered_lft - regen_advance) {
4532 struct inet6_ifaddr *ifpub = ifp->ifpub;
4533 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4534 next = ifp->tstamp + ifp->prefered_lft * HZ;
4535 if (!ifp->regen_count && ifpub) {
4538 in6_ifa_hold(ifpub);
4539 spin_unlock(&ifp->lock);
4541 spin_lock(&ifpub->lock);
4542 ifpub->regen_count = 0;
4543 spin_unlock(&ifpub->lock);
4544 rcu_read_unlock_bh();
4545 ipv6_create_tempaddr(ifpub, true);
4551 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4552 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4553 spin_unlock(&ifp->lock);
4555 /* ifp->prefered_lft <= ifp->valid_lft */
4556 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4557 next = ifp->tstamp + ifp->prefered_lft * HZ;
4558 spin_unlock(&ifp->lock);
4563 next_sec = round_jiffies_up(next);
4566 /* If rounded timeout is accurate enough, accept it. */
4567 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4568 next_sched = next_sec;
4570 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4571 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4572 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4574 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4575 now, next, next_sec, next_sched);
4576 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
4577 rcu_read_unlock_bh();
4580 static void addrconf_verify_work(struct work_struct *w)
4583 addrconf_verify_rtnl();
4587 static void addrconf_verify(void)
4589 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4592 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4593 struct in6_addr **peer_pfx)
4595 struct in6_addr *pfx = NULL;
4600 pfx = nla_data(addr);
4603 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4605 pfx = nla_data(local);
4611 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4612 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4613 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4614 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
4615 [IFA_FLAGS] = { .len = sizeof(u32) },
4616 [IFA_RT_PRIORITY] = { .len = sizeof(u32) },
4617 [IFA_TARGET_NETNSID] = { .type = NLA_S32 },
4621 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
4622 struct netlink_ext_ack *extack)
4624 struct net *net = sock_net(skb->sk);
4625 struct ifaddrmsg *ifm;
4626 struct nlattr *tb[IFA_MAX+1];
4627 struct in6_addr *pfx, *peer_pfx;
4631 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4632 ifa_ipv6_policy, extack);
4636 ifm = nlmsg_data(nlh);
4637 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4641 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4643 /* We ignore other flags so far. */
4644 ifa_flags &= IFA_F_MANAGETEMPADDR;
4646 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4647 ifm->ifa_prefixlen);
4650 static int modify_prefix_route(struct inet6_ifaddr *ifp,
4651 unsigned long expires, u32 flags,
4654 struct fib6_info *f6i;
4657 f6i = addrconf_get_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
4659 ifp->idev->dev, 0, RTF_DEFAULT, true);
4663 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF;
4664 if (f6i->fib6_metric != prio) {
4665 /* delete old one */
4666 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false);
4669 addrconf_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
4671 ifp->rt_priority, ifp->idev->dev,
4672 expires, flags, GFP_KERNEL);
4675 fib6_clean_expires(f6i);
4677 fib6_set_expires(f6i, expires);
4679 fib6_info_release(f6i);
4685 static int inet6_addr_modify(struct inet6_ifaddr *ifp, struct ifa6_config *cfg)
4689 unsigned long timeout;
4690 bool was_managetempaddr;
4691 bool had_prefixroute;
4692 bool new_peer = false;
4696 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
4699 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR &&
4700 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4703 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED)
4704 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC;
4706 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
4707 if (addrconf_finite_timeout(timeout)) {
4708 expires = jiffies_to_clock_t(timeout * HZ);
4709 cfg->valid_lft = timeout;
4710 flags = RTF_EXPIRES;
4714 cfg->ifa_flags |= IFA_F_PERMANENT;
4717 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
4718 if (addrconf_finite_timeout(timeout)) {
4720 cfg->ifa_flags |= IFA_F_DEPRECATED;
4721 cfg->preferred_lft = timeout;
4724 if (cfg->peer_pfx &&
4725 memcmp(&ifp->peer_addr, cfg->peer_pfx, sizeof(struct in6_addr))) {
4726 if (!ipv6_addr_any(&ifp->peer_addr))
4727 cleanup_prefix_route(ifp, expires, true, true);
4731 spin_lock_bh(&ifp->lock);
4732 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4733 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4734 !(ifp->flags & IFA_F_NOPREFIXROUTE);
4735 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4736 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4737 IFA_F_NOPREFIXROUTE);
4738 ifp->flags |= cfg->ifa_flags;
4739 ifp->tstamp = jiffies;
4740 ifp->valid_lft = cfg->valid_lft;
4741 ifp->prefered_lft = cfg->preferred_lft;
4743 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority)
4744 ifp->rt_priority = cfg->rt_priority;
4747 ifp->peer_addr = *cfg->peer_pfx;
4749 spin_unlock_bh(&ifp->lock);
4750 if (!(ifp->flags&IFA_F_TENTATIVE))
4751 ipv6_ifa_notify(0, ifp);
4753 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
4756 if (had_prefixroute)
4757 rc = modify_prefix_route(ifp, expires, flags, false);
4759 /* prefix route could have been deleted; if so restore it */
4760 if (rc == -ENOENT) {
4761 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
4762 ifp->rt_priority, ifp->idev->dev,
4763 expires, flags, GFP_KERNEL);
4766 if (had_prefixroute && !ipv6_addr_any(&ifp->peer_addr))
4767 rc = modify_prefix_route(ifp, expires, flags, true);
4769 if (rc == -ENOENT && !ipv6_addr_any(&ifp->peer_addr)) {
4770 addrconf_prefix_route(&ifp->peer_addr, ifp->prefix_len,
4771 ifp->rt_priority, ifp->idev->dev,
4772 expires, flags, GFP_KERNEL);
4774 } else if (had_prefixroute) {
4775 enum cleanup_prefix_rt_t action;
4776 unsigned long rt_expires;
4778 write_lock_bh(&ifp->idev->lock);
4779 action = check_cleanup_prefix_route(ifp, &rt_expires);
4780 write_unlock_bh(&ifp->idev->lock);
4782 if (action != CLEANUP_PREFIX_RT_NOP) {
4783 cleanup_prefix_route(ifp, rt_expires,
4784 action == CLEANUP_PREFIX_RT_DEL, false);
4788 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4789 if (was_managetempaddr &&
4790 !(ifp->flags & IFA_F_MANAGETEMPADDR)) {
4792 cfg->preferred_lft = 0;
4794 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft,
4795 cfg->preferred_lft, !was_managetempaddr,
4799 addrconf_verify_rtnl();
4805 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
4806 struct netlink_ext_ack *extack)
4808 struct net *net = sock_net(skb->sk);
4809 struct ifaddrmsg *ifm;
4810 struct nlattr *tb[IFA_MAX+1];
4811 struct in6_addr *peer_pfx;
4812 struct inet6_ifaddr *ifa;
4813 struct net_device *dev;
4814 struct inet6_dev *idev;
4815 struct ifa6_config cfg;
4818 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4819 ifa_ipv6_policy, extack);
4823 memset(&cfg, 0, sizeof(cfg));
4825 ifm = nlmsg_data(nlh);
4826 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4830 cfg.peer_pfx = peer_pfx;
4831 cfg.plen = ifm->ifa_prefixlen;
4832 if (tb[IFA_RT_PRIORITY])
4833 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]);
4835 cfg.valid_lft = INFINITY_LIFE_TIME;
4836 cfg.preferred_lft = INFINITY_LIFE_TIME;
4838 if (tb[IFA_CACHEINFO]) {
4839 struct ifa_cacheinfo *ci;
4841 ci = nla_data(tb[IFA_CACHEINFO]);
4842 cfg.valid_lft = ci->ifa_valid;
4843 cfg.preferred_lft = ci->ifa_prefered;
4846 dev = __dev_get_by_index(net, ifm->ifa_index);
4851 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]);
4853 cfg.ifa_flags = ifm->ifa_flags;
4855 /* We ignore other flags so far. */
4856 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS |
4857 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE |
4858 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC;
4860 idev = ipv6_find_idev(dev);
4862 return PTR_ERR(idev);
4864 if (!ipv6_allow_optimistic_dad(net, idev))
4865 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC;
4867 if (cfg.ifa_flags & IFA_F_NODAD &&
4868 cfg.ifa_flags & IFA_F_OPTIMISTIC) {
4869 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive");
4873 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1);
4876 * It would be best to check for !NLM_F_CREATE here but
4877 * userspace already relies on not having to provide this.
4879 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack);
4882 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4883 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4886 err = inet6_addr_modify(ifa, &cfg);
4893 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4894 u8 scope, int ifindex)
4896 struct ifaddrmsg *ifm;
4898 ifm = nlmsg_data(nlh);
4899 ifm->ifa_family = AF_INET6;
4900 ifm->ifa_prefixlen = prefixlen;
4901 ifm->ifa_flags = flags;
4902 ifm->ifa_scope = scope;
4903 ifm->ifa_index = ifindex;
4906 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4907 unsigned long tstamp, u32 preferred, u32 valid)
4909 struct ifa_cacheinfo ci;
4911 ci.cstamp = cstamp_delta(cstamp);
4912 ci.tstamp = cstamp_delta(tstamp);
4913 ci.ifa_prefered = preferred;
4914 ci.ifa_valid = valid;
4916 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4919 static inline int rt_scope(int ifa_scope)
4921 if (ifa_scope & IFA_HOST)
4922 return RT_SCOPE_HOST;
4923 else if (ifa_scope & IFA_LINK)
4924 return RT_SCOPE_LINK;
4925 else if (ifa_scope & IFA_SITE)
4926 return RT_SCOPE_SITE;
4928 return RT_SCOPE_UNIVERSE;
4931 static inline int inet6_ifaddr_msgsize(void)
4933 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4934 + nla_total_size(16) /* IFA_LOCAL */
4935 + nla_total_size(16) /* IFA_ADDRESS */
4936 + nla_total_size(sizeof(struct ifa_cacheinfo))
4937 + nla_total_size(4) /* IFA_FLAGS */
4938 + nla_total_size(4) /* IFA_RT_PRIORITY */;
4947 struct inet6_fill_args {
4954 enum addr_type_t type;
4957 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
4958 struct inet6_fill_args *args)
4960 struct nlmsghdr *nlh;
4961 u32 preferred, valid;
4963 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
4964 sizeof(struct ifaddrmsg), args->flags);
4968 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4969 ifa->idev->dev->ifindex);
4971 if (args->netnsid >= 0 &&
4972 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
4975 if (!((ifa->flags&IFA_F_PERMANENT) &&
4976 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
4977 preferred = ifa->prefered_lft;
4978 valid = ifa->valid_lft;
4979 if (preferred != INFINITY_LIFE_TIME) {
4980 long tval = (jiffies - ifa->tstamp)/HZ;
4981 if (preferred > tval)
4985 if (valid != INFINITY_LIFE_TIME) {
4993 preferred = INFINITY_LIFE_TIME;
4994 valid = INFINITY_LIFE_TIME;
4997 if (!ipv6_addr_any(&ifa->peer_addr)) {
4998 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4999 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
5002 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
5005 if (ifa->rt_priority &&
5006 nla_put_u32(skb, IFA_RT_PRIORITY, ifa->rt_priority))
5009 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
5012 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
5015 nlmsg_end(skb, nlh);
5019 nlmsg_cancel(skb, nlh);
5023 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
5024 struct inet6_fill_args *args)
5026 struct nlmsghdr *nlh;
5027 u8 scope = RT_SCOPE_UNIVERSE;
5028 int ifindex = ifmca->idev->dev->ifindex;
5030 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
5031 scope = RT_SCOPE_SITE;
5033 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5034 sizeof(struct ifaddrmsg), args->flags);
5038 if (args->netnsid >= 0 &&
5039 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) {
5040 nlmsg_cancel(skb, nlh);
5044 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
5045 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
5046 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
5047 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
5048 nlmsg_cancel(skb, nlh);
5052 nlmsg_end(skb, nlh);
5056 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
5057 struct inet6_fill_args *args)
5059 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt);
5060 int ifindex = dev ? dev->ifindex : 1;
5061 struct nlmsghdr *nlh;
5062 u8 scope = RT_SCOPE_UNIVERSE;
5064 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
5065 scope = RT_SCOPE_SITE;
5067 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5068 sizeof(struct ifaddrmsg), args->flags);
5072 if (args->netnsid >= 0 &&
5073 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) {
5074 nlmsg_cancel(skb, nlh);
5078 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
5079 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
5080 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
5081 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
5082 nlmsg_cancel(skb, nlh);
5086 nlmsg_end(skb, nlh);
5090 /* called with rcu_read_lock() */
5091 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
5092 struct netlink_callback *cb, int s_ip_idx,
5093 struct inet6_fill_args *fillargs)
5095 struct ifmcaddr6 *ifmca;
5096 struct ifacaddr6 *ifaca;
5100 read_lock_bh(&idev->lock);
5101 switch (fillargs->type) {
5102 case UNICAST_ADDR: {
5103 struct inet6_ifaddr *ifa;
5104 fillargs->event = RTM_NEWADDR;
5106 /* unicast address incl. temp addr */
5107 list_for_each_entry(ifa, &idev->addr_list, if_list) {
5108 if (ip_idx < s_ip_idx)
5110 err = inet6_fill_ifaddr(skb, ifa, fillargs);
5113 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
5119 case MULTICAST_ADDR:
5120 read_unlock_bh(&idev->lock);
5121 fillargs->event = RTM_GETMULTICAST;
5123 /* multicast address */
5124 for (ifmca = rcu_dereference(idev->mc_list);
5126 ifmca = rcu_dereference(ifmca->next), ip_idx++) {
5127 if (ip_idx < s_ip_idx)
5129 err = inet6_fill_ifmcaddr(skb, ifmca, fillargs);
5133 read_lock_bh(&idev->lock);
5136 fillargs->event = RTM_GETANYCAST;
5137 /* anycast address */
5138 for (ifaca = idev->ac_list; ifaca;
5139 ifaca = ifaca->aca_next, ip_idx++) {
5140 if (ip_idx < s_ip_idx)
5142 err = inet6_fill_ifacaddr(skb, ifaca, fillargs);
5150 read_unlock_bh(&idev->lock);
5151 cb->args[2] = ip_idx;
5155 static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh,
5156 struct inet6_fill_args *fillargs,
5157 struct net **tgt_net, struct sock *sk,
5158 struct netlink_callback *cb)
5160 struct netlink_ext_ack *extack = cb->extack;
5161 struct nlattr *tb[IFA_MAX+1];
5162 struct ifaddrmsg *ifm;
5165 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5166 NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request");
5170 ifm = nlmsg_data(nlh);
5171 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5172 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request");
5176 fillargs->ifindex = ifm->ifa_index;
5177 if (fillargs->ifindex) {
5178 cb->answer_flags |= NLM_F_DUMP_FILTERED;
5179 fillargs->flags |= NLM_F_DUMP_FILTERED;
5182 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5183 ifa_ipv6_policy, extack);
5187 for (i = 0; i <= IFA_MAX; ++i) {
5191 if (i == IFA_TARGET_NETNSID) {
5194 fillargs->netnsid = nla_get_s32(tb[i]);
5195 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid);
5197 fillargs->netnsid = -1;
5198 NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id");
5199 return PTR_ERR(net);
5203 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request");
5211 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
5212 enum addr_type_t type)
5214 const struct nlmsghdr *nlh = cb->nlh;
5215 struct inet6_fill_args fillargs = {
5216 .portid = NETLINK_CB(cb->skb).portid,
5217 .seq = cb->nlh->nlmsg_seq,
5218 .flags = NLM_F_MULTI,
5222 struct net *tgt_net = sock_net(skb->sk);
5223 int idx, s_idx, s_ip_idx;
5225 struct net_device *dev;
5226 struct inet6_dev *idev;
5227 struct hlist_head *head;
5231 s_idx = idx = cb->args[1];
5232 s_ip_idx = cb->args[2];
5234 if (cb->strict_check) {
5235 err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net,
5241 if (fillargs.ifindex) {
5242 dev = __dev_get_by_index(tgt_net, fillargs.ifindex);
5247 idev = __in6_dev_get(dev);
5249 err = in6_dump_addrs(idev, skb, cb, s_ip_idx,
5259 cb->seq = atomic_read(&tgt_net->ipv6.dev_addr_genid) ^ tgt_net->dev_base_seq;
5260 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5262 head = &tgt_net->dev_index_head[h];
5263 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5266 if (h > s_h || idx > s_idx)
5268 idev = __in6_dev_get(dev);
5272 if (in6_dump_addrs(idev, skb, cb, s_ip_idx,
5284 if (fillargs.netnsid >= 0)
5287 return skb->len ? : err;
5290 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
5292 enum addr_type_t type = UNICAST_ADDR;
5294 return inet6_dump_addr(skb, cb, type);
5297 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
5299 enum addr_type_t type = MULTICAST_ADDR;
5301 return inet6_dump_addr(skb, cb, type);
5305 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
5307 enum addr_type_t type = ANYCAST_ADDR;
5309 return inet6_dump_addr(skb, cb, type);
5312 static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb,
5313 const struct nlmsghdr *nlh,
5315 struct netlink_ext_ack *extack)
5317 struct ifaddrmsg *ifm;
5320 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5321 NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request");
5325 if (!netlink_strict_get_check(skb))
5326 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
5327 ifa_ipv6_policy, extack);
5329 ifm = nlmsg_data(nlh);
5330 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5331 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request");
5335 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5336 ifa_ipv6_policy, extack);
5340 for (i = 0; i <= IFA_MAX; i++) {
5345 case IFA_TARGET_NETNSID:
5350 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request");
5358 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
5359 struct netlink_ext_ack *extack)
5361 struct net *tgt_net = sock_net(in_skb->sk);
5362 struct inet6_fill_args fillargs = {
5363 .portid = NETLINK_CB(in_skb).portid,
5364 .seq = nlh->nlmsg_seq,
5365 .event = RTM_NEWADDR,
5369 struct ifaddrmsg *ifm;
5370 struct nlattr *tb[IFA_MAX+1];
5371 struct in6_addr *addr = NULL, *peer;
5372 struct net_device *dev = NULL;
5373 struct inet6_ifaddr *ifa;
5374 struct sk_buff *skb;
5377 err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack);
5381 if (tb[IFA_TARGET_NETNSID]) {
5382 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]);
5384 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk,
5386 if (IS_ERR(tgt_net))
5387 return PTR_ERR(tgt_net);
5390 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
5394 ifm = nlmsg_data(nlh);
5396 dev = dev_get_by_index(tgt_net, ifm->ifa_index);
5398 ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1);
5400 err = -EADDRNOTAVAIL;
5404 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
5410 err = inet6_fill_ifaddr(skb, ifa, &fillargs);
5412 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5413 WARN_ON(err == -EMSGSIZE);
5417 err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid);
5422 if (fillargs.netnsid >= 0)
5428 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
5430 struct sk_buff *skb;
5431 struct net *net = dev_net(ifa->idev->dev);
5432 struct inet6_fill_args fillargs = {
5441 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5445 err = inet6_fill_ifaddr(skb, ifa, &fillargs);
5447 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5448 WARN_ON(err == -EMSGSIZE);
5452 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
5456 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
5459 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
5460 __s32 *array, int bytes)
5462 BUG_ON(bytes < (DEVCONF_MAX * 4));
5464 memset(array, 0, bytes);
5465 array[DEVCONF_FORWARDING] = cnf->forwarding;
5466 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
5467 array[DEVCONF_MTU6] = cnf->mtu6;
5468 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
5469 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
5470 array[DEVCONF_AUTOCONF] = cnf->autoconf;
5471 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
5472 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
5473 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
5474 jiffies_to_msecs(cnf->rtr_solicit_interval);
5475 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
5476 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
5477 array[DEVCONF_RTR_SOLICIT_DELAY] =
5478 jiffies_to_msecs(cnf->rtr_solicit_delay);
5479 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
5480 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
5481 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
5482 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
5483 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
5484 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
5485 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
5486 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
5487 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
5488 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
5489 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
5490 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
5491 array[DEVCONF_RA_DEFRTR_METRIC] = cnf->ra_defrtr_metric;
5492 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
5493 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
5494 #ifdef CONFIG_IPV6_ROUTER_PREF
5495 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
5496 array[DEVCONF_RTR_PROBE_INTERVAL] =
5497 jiffies_to_msecs(cnf->rtr_probe_interval);
5498 #ifdef CONFIG_IPV6_ROUTE_INFO
5499 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen;
5500 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
5503 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
5504 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
5505 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5506 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
5507 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
5509 #ifdef CONFIG_IPV6_MROUTE
5510 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
5512 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
5513 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
5514 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5515 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
5516 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
5517 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
5518 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
5519 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
5520 /* we omit DEVCONF_STABLE_SECRET for now */
5521 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
5522 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
5523 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
5524 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
5525 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled;
5526 #ifdef CONFIG_IPV6_SEG6_HMAC
5527 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac;
5529 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad;
5530 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode;
5531 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy;
5532 array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass;
5533 array[DEVCONF_RPL_SEG_ENABLED] = cnf->rpl_seg_enabled;
5534 array[DEVCONF_IOAM6_ENABLED] = cnf->ioam6_enabled;
5535 array[DEVCONF_IOAM6_ID] = cnf->ioam6_id;
5536 array[DEVCONF_IOAM6_ID_WIDE] = cnf->ioam6_id_wide;
5539 static inline size_t inet6_ifla6_size(void)
5541 return nla_total_size(4) /* IFLA_INET6_FLAGS */
5542 + nla_total_size(sizeof(struct ifla_cacheinfo))
5543 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5544 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
5545 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
5546 + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */
5547 + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */
5548 + nla_total_size(4) /* IFLA_INET6_RA_MTU */
5552 static inline size_t inet6_if_nlmsg_size(void)
5554 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5555 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5556 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5557 + nla_total_size(4) /* IFLA_MTU */
5558 + nla_total_size(4) /* IFLA_LINK */
5559 + nla_total_size(1) /* IFLA_OPERSTATE */
5560 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
5563 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
5567 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
5570 /* Use put_unaligned() because stats may not be aligned for u64. */
5571 put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5572 for (i = 1; i < ICMP6_MIB_MAX; i++)
5573 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
5575 memset(&stats[ICMP6_MIB_MAX], 0, pad);
5578 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
5579 int bytes, size_t syncpoff)
5582 u64 buff[IPSTATS_MIB_MAX];
5583 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5587 memset(buff, 0, sizeof(buff));
5588 buff[0] = IPSTATS_MIB_MAX;
5590 for_each_possible_cpu(c) {
5591 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5592 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5595 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5596 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
5599 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5603 case IFLA_INET6_STATS:
5604 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5605 offsetof(struct ipstats_mib, syncp));
5607 case IFLA_INET6_ICMP6STATS:
5608 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
5613 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5614 u32 ext_filter_mask)
5617 struct ifla_cacheinfo ci;
5619 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5620 goto nla_put_failure;
5621 ci.max_reasm_len = IPV6_MAXPLEN;
5622 ci.tstamp = cstamp_delta(idev->tstamp);
5623 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
5624 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
5625 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5626 goto nla_put_failure;
5627 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
5629 goto nla_put_failure;
5630 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5632 /* XXX - MC not implemented */
5634 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5637 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
5639 goto nla_put_failure;
5640 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5642 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
5644 goto nla_put_failure;
5645 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5647 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
5649 goto nla_put_failure;
5650 read_lock_bh(&idev->lock);
5651 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5652 read_unlock_bh(&idev->lock);
5654 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode))
5655 goto nla_put_failure;
5658 nla_put_u32(skb, IFLA_INET6_RA_MTU, idev->ra_mtu))
5659 goto nla_put_failure;
5667 static size_t inet6_get_link_af_size(const struct net_device *dev,
5668 u32 ext_filter_mask)
5670 if (!__in6_dev_get(dev))
5673 return inet6_ifla6_size();
5676 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5677 u32 ext_filter_mask)
5679 struct inet6_dev *idev = __in6_dev_get(dev);
5684 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
5690 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token,
5691 struct netlink_ext_ack *extack)
5693 struct inet6_ifaddr *ifp;
5694 struct net_device *dev = idev->dev;
5695 bool clear_token, update_rs = false;
5696 struct in6_addr ll_addr;
5703 if (dev->flags & IFF_LOOPBACK) {
5704 NL_SET_ERR_MSG_MOD(extack, "Device is loopback");
5708 if (dev->flags & IFF_NOARP) {
5709 NL_SET_ERR_MSG_MOD(extack,
5710 "Device does not do neighbour discovery");
5714 if (!ipv6_accept_ra(idev)) {
5715 NL_SET_ERR_MSG_MOD(extack,
5716 "Router advertisement is disabled on device");
5720 if (idev->cnf.rtr_solicits == 0) {
5721 NL_SET_ERR_MSG(extack,
5722 "Router solicitation is disabled on device");
5726 write_lock_bh(&idev->lock);
5728 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5729 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5731 write_unlock_bh(&idev->lock);
5733 clear_token = ipv6_addr_any(token);
5737 if (!idev->dead && (idev->if_flags & IF_READY) &&
5738 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5739 IFA_F_OPTIMISTIC)) {
5740 /* If we're not ready, then normal ifup will take care
5741 * of this. Otherwise, we need to request our rs here.
5743 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5748 write_lock_bh(&idev->lock);
5751 idev->if_flags |= IF_RS_SENT;
5752 idev->rs_interval = rfc3315_s14_backoff_init(
5753 idev->cnf.rtr_solicit_interval);
5754 idev->rs_probes = 1;
5755 addrconf_mod_rs_timer(idev, idev->rs_interval);
5758 /* Well, that's kinda nasty ... */
5759 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5760 spin_lock(&ifp->lock);
5761 if (ifp->tokenized) {
5763 ifp->prefered_lft = 0;
5765 spin_unlock(&ifp->lock);
5768 write_unlock_bh(&idev->lock);
5769 inet6_ifinfo_notify(RTM_NEWLINK, idev);
5770 addrconf_verify_rtnl();
5774 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5775 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5776 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5777 [IFLA_INET6_RA_MTU] = { .type = NLA_REJECT,
5779 "IFLA_INET6_RA_MTU can not be set" },
5782 static int check_addr_gen_mode(int mode)
5784 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5785 mode != IN6_ADDR_GEN_MODE_NONE &&
5786 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5787 mode != IN6_ADDR_GEN_MODE_RANDOM)
5792 static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5795 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5796 !idev->cnf.stable_secret.initialized &&
5797 !net->ipv6.devconf_dflt->stable_secret.initialized)
5802 static int inet6_validate_link_af(const struct net_device *dev,
5803 const struct nlattr *nla,
5804 struct netlink_ext_ack *extack)
5806 struct nlattr *tb[IFLA_INET6_MAX + 1];
5807 struct inet6_dev *idev = NULL;
5811 idev = __in6_dev_get(dev);
5813 return -EAFNOSUPPORT;
5816 err = nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla,
5817 inet6_af_policy, extack);
5821 if (!tb[IFLA_INET6_TOKEN] && !tb[IFLA_INET6_ADDR_GEN_MODE])
5824 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5825 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5827 if (check_addr_gen_mode(mode) < 0)
5829 if (dev && check_stable_privacy(idev, dev_net(dev), mode) < 0)
5836 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla,
5837 struct netlink_ext_ack *extack)
5839 struct inet6_dev *idev = __in6_dev_get(dev);
5840 struct nlattr *tb[IFLA_INET6_MAX + 1];
5844 return -EAFNOSUPPORT;
5846 if (nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0)
5849 if (tb[IFLA_INET6_TOKEN]) {
5850 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]),
5856 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5857 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5859 idev->cnf.addr_gen_mode = mode;
5865 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
5866 u32 portid, u32 seq, int event, unsigned int flags)
5868 struct net_device *dev = idev->dev;
5869 struct ifinfomsg *hdr;
5870 struct nlmsghdr *nlh;
5873 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
5877 hdr = nlmsg_data(nlh);
5878 hdr->ifi_family = AF_INET6;
5880 hdr->ifi_type = dev->type;
5881 hdr->ifi_index = dev->ifindex;
5882 hdr->ifi_flags = dev_get_flags(dev);
5883 hdr->ifi_change = 0;
5885 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5887 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5888 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
5889 (dev->ifindex != dev_get_iflink(dev) &&
5890 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5891 nla_put_u8(skb, IFLA_OPERSTATE,
5892 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
5893 goto nla_put_failure;
5894 protoinfo = nla_nest_start_noflag(skb, IFLA_PROTINFO);
5896 goto nla_put_failure;
5898 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
5899 goto nla_put_failure;
5901 nla_nest_end(skb, protoinfo);
5902 nlmsg_end(skb, nlh);
5906 nlmsg_cancel(skb, nlh);
5910 static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh,
5911 struct netlink_ext_ack *extack)
5913 struct ifinfomsg *ifm;
5915 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5916 NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request");
5920 if (nlmsg_attrlen(nlh, sizeof(*ifm))) {
5921 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header");
5925 ifm = nlmsg_data(nlh);
5926 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
5927 ifm->ifi_change || ifm->ifi_index) {
5928 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request");
5935 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5937 struct net *net = sock_net(skb->sk);
5940 struct net_device *dev;
5941 struct inet6_dev *idev;
5942 struct hlist_head *head;
5944 /* only requests using strict checking can pass data to
5945 * influence the dump
5947 if (cb->strict_check) {
5948 int err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack);
5955 s_idx = cb->args[1];
5958 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5960 head = &net->dev_index_head[h];
5961 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5964 idev = __in6_dev_get(dev);
5967 if (inet6_fill_ifinfo(skb, idev,
5968 NETLINK_CB(cb->skb).portid,
5970 RTM_NEWLINK, NLM_F_MULTI) < 0)
5984 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5986 struct sk_buff *skb;
5987 struct net *net = dev_net(idev->dev);
5990 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
5994 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
5996 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5997 WARN_ON(err == -EMSGSIZE);
6001 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
6005 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
6008 static inline size_t inet6_prefix_nlmsg_size(void)
6010 return NLMSG_ALIGN(sizeof(struct prefixmsg))
6011 + nla_total_size(sizeof(struct in6_addr))
6012 + nla_total_size(sizeof(struct prefix_cacheinfo));
6015 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
6016 struct prefix_info *pinfo, u32 portid, u32 seq,
6017 int event, unsigned int flags)
6019 struct prefixmsg *pmsg;
6020 struct nlmsghdr *nlh;
6021 struct prefix_cacheinfo ci;
6023 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
6027 pmsg = nlmsg_data(nlh);
6028 pmsg->prefix_family = AF_INET6;
6029 pmsg->prefix_pad1 = 0;
6030 pmsg->prefix_pad2 = 0;
6031 pmsg->prefix_ifindex = idev->dev->ifindex;
6032 pmsg->prefix_len = pinfo->prefix_len;
6033 pmsg->prefix_type = pinfo->type;
6034 pmsg->prefix_pad3 = 0;
6035 pmsg->prefix_flags = 0;
6037 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
6038 if (pinfo->autoconf)
6039 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
6041 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
6042 goto nla_put_failure;
6043 ci.preferred_time = ntohl(pinfo->prefered);
6044 ci.valid_time = ntohl(pinfo->valid);
6045 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
6046 goto nla_put_failure;
6047 nlmsg_end(skb, nlh);
6051 nlmsg_cancel(skb, nlh);
6055 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
6056 struct prefix_info *pinfo)
6058 struct sk_buff *skb;
6059 struct net *net = dev_net(idev->dev);
6062 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
6066 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
6068 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
6069 WARN_ON(err == -EMSGSIZE);
6073 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
6077 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
6080 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
6082 struct net *net = dev_net(ifp->idev->dev);
6087 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
6092 * If the address was optimistic we inserted the route at the
6093 * start of our DAD process, so we don't need to do it again.
6094 * If the device was taken down in the middle of the DAD
6095 * cycle there is a race where we could get here without a
6096 * host route, so nothing to insert. That will be fixed when
6097 * the device is brought up.
6099 if (ifp->rt && !rcu_access_pointer(ifp->rt->fib6_node)) {
6100 ip6_ins_rt(net, ifp->rt);
6101 } else if (!ifp->rt && (ifp->idev->dev->flags & IFF_UP)) {
6102 pr_warn("BUG: Address %pI6c on device %s is missing its host route.\n",
6103 &ifp->addr, ifp->idev->dev->name);
6106 if (ifp->idev->cnf.forwarding)
6107 addrconf_join_anycast(ifp);
6108 if (!ipv6_addr_any(&ifp->peer_addr))
6109 addrconf_prefix_route(&ifp->peer_addr, 128,
6110 ifp->rt_priority, ifp->idev->dev,
6114 if (ifp->idev->cnf.forwarding)
6115 addrconf_leave_anycast(ifp);
6116 addrconf_leave_solict(ifp->idev, &ifp->addr);
6117 if (!ipv6_addr_any(&ifp->peer_addr)) {
6118 struct fib6_info *rt;
6120 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
6121 ifp->idev->dev, 0, 0,
6124 ip6_del_rt(net, rt, false);
6127 ip6_del_rt(net, ifp->rt, false);
6130 rt_genid_bump_ipv6(net);
6133 atomic_inc(&net->ipv6.dev_addr_genid);
6136 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
6138 if (likely(ifp->idev->dead == 0))
6139 __ipv6_ifa_notify(event, ifp);
6142 #ifdef CONFIG_SYSCTL
6144 static int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
6145 void *buffer, size_t *lenp, loff_t *ppos)
6147 int *valp = ctl->data;
6150 struct ctl_table lctl;
6154 * ctl->data points to idev->cnf.forwarding, we should
6155 * not modify it until we get the rtnl lock.
6160 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6163 ret = addrconf_fixup_forwarding(ctl, valp, val);
6169 static int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
6170 void *buffer, size_t *lenp, loff_t *ppos)
6172 struct inet6_dev *idev = ctl->extra1;
6173 int min_mtu = IPV6_MIN_MTU;
6174 struct ctl_table lctl;
6177 lctl.extra1 = &min_mtu;
6178 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
6180 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
6183 static void dev_disable_change(struct inet6_dev *idev)
6185 struct netdev_notifier_info info;
6187 if (!idev || !idev->dev)
6190 netdev_notifier_info_init(&info, idev->dev);
6191 if (idev->cnf.disable_ipv6)
6192 addrconf_notify(NULL, NETDEV_DOWN, &info);
6194 addrconf_notify(NULL, NETDEV_UP, &info);
6197 static void addrconf_disable_change(struct net *net, __s32 newf)
6199 struct net_device *dev;
6200 struct inet6_dev *idev;
6202 for_each_netdev(net, dev) {
6203 idev = __in6_dev_get(dev);
6205 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
6206 idev->cnf.disable_ipv6 = newf;
6208 dev_disable_change(idev);
6213 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
6218 if (!rtnl_trylock())
6219 return restart_syscall();
6221 net = (struct net *)table->extra2;
6225 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
6230 if (p == &net->ipv6.devconf_all->disable_ipv6) {
6231 net->ipv6.devconf_dflt->disable_ipv6 = newf;
6232 addrconf_disable_change(net, newf);
6233 } else if ((!newf) ^ (!old))
6234 dev_disable_change((struct inet6_dev *)table->extra1);
6240 static int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
6241 void *buffer, size_t *lenp, loff_t *ppos)
6243 int *valp = ctl->data;
6246 struct ctl_table lctl;
6250 * ctl->data points to idev->cnf.disable_ipv6, we should
6251 * not modify it until we get the rtnl lock.
6256 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6259 ret = addrconf_disable_ipv6(ctl, valp, val);
6265 static int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
6266 void *buffer, size_t *lenp, loff_t *ppos)
6268 int *valp = ctl->data;
6273 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
6276 if (write && old != new) {
6277 struct net *net = ctl->extra2;
6279 if (!rtnl_trylock())
6280 return restart_syscall();
6282 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
6283 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6284 NETCONFA_PROXY_NEIGH,
6285 NETCONFA_IFINDEX_DEFAULT,
6286 net->ipv6.devconf_dflt);
6287 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
6288 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6289 NETCONFA_PROXY_NEIGH,
6290 NETCONFA_IFINDEX_ALL,
6291 net->ipv6.devconf_all);
6293 struct inet6_dev *idev = ctl->extra1;
6295 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6296 NETCONFA_PROXY_NEIGH,
6306 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
6307 void *buffer, size_t *lenp,
6312 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
6313 struct net *net = (struct net *)ctl->extra2;
6314 struct ctl_table tmp = {
6316 .maxlen = sizeof(new_val),
6320 if (!rtnl_trylock())
6321 return restart_syscall();
6323 new_val = *((u32 *)ctl->data);
6325 ret = proc_douintvec(&tmp, write, buffer, lenp, ppos);
6330 if (check_addr_gen_mode(new_val) < 0) {
6336 if (check_stable_privacy(idev, net, new_val) < 0) {
6341 if (idev->cnf.addr_gen_mode != new_val) {
6342 idev->cnf.addr_gen_mode = new_val;
6343 addrconf_dev_config(idev->dev);
6345 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) {
6346 struct net_device *dev;
6348 net->ipv6.devconf_dflt->addr_gen_mode = new_val;
6349 for_each_netdev(net, dev) {
6350 idev = __in6_dev_get(dev);
6352 idev->cnf.addr_gen_mode != new_val) {
6353 idev->cnf.addr_gen_mode = new_val;
6354 addrconf_dev_config(idev->dev);
6359 *((u32 *)ctl->data) = new_val;
6368 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
6369 void *buffer, size_t *lenp,
6373 struct in6_addr addr;
6374 char str[IPV6_MAX_STRLEN];
6375 struct ctl_table lctl = *ctl;
6376 struct net *net = ctl->extra2;
6377 struct ipv6_stable_secret *secret = ctl->data;
6379 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
6382 lctl.maxlen = IPV6_MAX_STRLEN;
6385 if (!rtnl_trylock())
6386 return restart_syscall();
6388 if (!write && !secret->initialized) {
6393 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
6394 if (err >= sizeof(str)) {
6399 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
6403 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
6408 secret->initialized = true;
6409 secret->secret = addr;
6411 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
6412 struct net_device *dev;
6414 for_each_netdev(net, dev) {
6415 struct inet6_dev *idev = __in6_dev_get(dev);
6418 idev->cnf.addr_gen_mode =
6419 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
6423 struct inet6_dev *idev = ctl->extra1;
6425 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
6435 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
6436 int write, void *buffer,
6440 int *valp = ctl->data;
6443 struct ctl_table lctl;
6446 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
6447 * we should not modify it until we get the rtnl lock.
6452 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6455 ret = addrconf_fixup_linkdown(ctl, valp, val);
6462 void addrconf_set_nopolicy(struct rt6_info *rt, int action)
6466 rt->dst.flags |= DST_NOPOLICY;
6468 rt->dst.flags &= ~DST_NOPOLICY;
6473 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
6475 struct inet6_ifaddr *ifa;
6477 read_lock_bh(&idev->lock);
6478 list_for_each_entry(ifa, &idev->addr_list, if_list) {
6479 spin_lock(&ifa->lock);
6481 /* host routes only use builtin fib6_nh */
6482 struct fib6_nh *nh = ifa->rt->fib6_nh;
6486 ifa->rt->dst_nopolicy = val ? true : false;
6487 if (nh->rt6i_pcpu) {
6488 for_each_possible_cpu(cpu) {
6489 struct rt6_info **rtp;
6491 rtp = per_cpu_ptr(nh->rt6i_pcpu, cpu);
6492 addrconf_set_nopolicy(*rtp, val);
6497 spin_unlock(&ifa->lock);
6499 read_unlock_bh(&idev->lock);
6503 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val)
6505 struct inet6_dev *idev;
6508 if (!rtnl_trylock())
6509 return restart_syscall();
6513 net = (struct net *)ctl->extra2;
6514 if (valp == &net->ipv6.devconf_dflt->disable_policy) {
6519 if (valp == &net->ipv6.devconf_all->disable_policy) {
6520 struct net_device *dev;
6522 for_each_netdev(net, dev) {
6523 idev = __in6_dev_get(dev);
6525 addrconf_disable_policy_idev(idev, val);
6528 idev = (struct inet6_dev *)ctl->extra1;
6529 addrconf_disable_policy_idev(idev, val);
6536 static int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write,
6537 void *buffer, size_t *lenp, loff_t *ppos)
6539 int *valp = ctl->data;
6542 struct ctl_table lctl;
6547 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6549 if (write && (*valp != val))
6550 ret = addrconf_disable_policy(ctl, valp, val);
6558 static int minus_one = -1;
6559 static const int two_five_five = 255;
6560 static u32 ioam6_if_id_max = U16_MAX;
6562 static const struct ctl_table addrconf_sysctl[] = {
6564 .procname = "forwarding",
6565 .data = &ipv6_devconf.forwarding,
6566 .maxlen = sizeof(int),
6568 .proc_handler = addrconf_sysctl_forward,
6571 .procname = "hop_limit",
6572 .data = &ipv6_devconf.hop_limit,
6573 .maxlen = sizeof(int),
6575 .proc_handler = proc_dointvec_minmax,
6576 .extra1 = (void *)SYSCTL_ONE,
6577 .extra2 = (void *)&two_five_five,
6581 .data = &ipv6_devconf.mtu6,
6582 .maxlen = sizeof(int),
6584 .proc_handler = addrconf_sysctl_mtu,
6587 .procname = "accept_ra",
6588 .data = &ipv6_devconf.accept_ra,
6589 .maxlen = sizeof(int),
6591 .proc_handler = proc_dointvec,
6594 .procname = "accept_redirects",
6595 .data = &ipv6_devconf.accept_redirects,
6596 .maxlen = sizeof(int),
6598 .proc_handler = proc_dointvec,
6601 .procname = "autoconf",
6602 .data = &ipv6_devconf.autoconf,
6603 .maxlen = sizeof(int),
6605 .proc_handler = proc_dointvec,
6608 .procname = "dad_transmits",
6609 .data = &ipv6_devconf.dad_transmits,
6610 .maxlen = sizeof(int),
6612 .proc_handler = proc_dointvec,
6615 .procname = "router_solicitations",
6616 .data = &ipv6_devconf.rtr_solicits,
6617 .maxlen = sizeof(int),
6619 .proc_handler = proc_dointvec_minmax,
6620 .extra1 = &minus_one,
6623 .procname = "router_solicitation_interval",
6624 .data = &ipv6_devconf.rtr_solicit_interval,
6625 .maxlen = sizeof(int),
6627 .proc_handler = proc_dointvec_jiffies,
6630 .procname = "router_solicitation_max_interval",
6631 .data = &ipv6_devconf.rtr_solicit_max_interval,
6632 .maxlen = sizeof(int),
6634 .proc_handler = proc_dointvec_jiffies,
6637 .procname = "router_solicitation_delay",
6638 .data = &ipv6_devconf.rtr_solicit_delay,
6639 .maxlen = sizeof(int),
6641 .proc_handler = proc_dointvec_jiffies,
6644 .procname = "force_mld_version",
6645 .data = &ipv6_devconf.force_mld_version,
6646 .maxlen = sizeof(int),
6648 .proc_handler = proc_dointvec,
6651 .procname = "mldv1_unsolicited_report_interval",
6653 &ipv6_devconf.mldv1_unsolicited_report_interval,
6654 .maxlen = sizeof(int),
6656 .proc_handler = proc_dointvec_ms_jiffies,
6659 .procname = "mldv2_unsolicited_report_interval",
6661 &ipv6_devconf.mldv2_unsolicited_report_interval,
6662 .maxlen = sizeof(int),
6664 .proc_handler = proc_dointvec_ms_jiffies,
6667 .procname = "use_tempaddr",
6668 .data = &ipv6_devconf.use_tempaddr,
6669 .maxlen = sizeof(int),
6671 .proc_handler = proc_dointvec,
6674 .procname = "temp_valid_lft",
6675 .data = &ipv6_devconf.temp_valid_lft,
6676 .maxlen = sizeof(int),
6678 .proc_handler = proc_dointvec,
6681 .procname = "temp_prefered_lft",
6682 .data = &ipv6_devconf.temp_prefered_lft,
6683 .maxlen = sizeof(int),
6685 .proc_handler = proc_dointvec,
6688 .procname = "regen_max_retry",
6689 .data = &ipv6_devconf.regen_max_retry,
6690 .maxlen = sizeof(int),
6692 .proc_handler = proc_dointvec,
6695 .procname = "max_desync_factor",
6696 .data = &ipv6_devconf.max_desync_factor,
6697 .maxlen = sizeof(int),
6699 .proc_handler = proc_dointvec,
6702 .procname = "max_addresses",
6703 .data = &ipv6_devconf.max_addresses,
6704 .maxlen = sizeof(int),
6706 .proc_handler = proc_dointvec,
6709 .procname = "accept_ra_defrtr",
6710 .data = &ipv6_devconf.accept_ra_defrtr,
6711 .maxlen = sizeof(int),
6713 .proc_handler = proc_dointvec,
6716 .procname = "ra_defrtr_metric",
6717 .data = &ipv6_devconf.ra_defrtr_metric,
6718 .maxlen = sizeof(u32),
6720 .proc_handler = proc_douintvec_minmax,
6721 .extra1 = (void *)SYSCTL_ONE,
6724 .procname = "accept_ra_min_hop_limit",
6725 .data = &ipv6_devconf.accept_ra_min_hop_limit,
6726 .maxlen = sizeof(int),
6728 .proc_handler = proc_dointvec,
6731 .procname = "accept_ra_pinfo",
6732 .data = &ipv6_devconf.accept_ra_pinfo,
6733 .maxlen = sizeof(int),
6735 .proc_handler = proc_dointvec,
6737 #ifdef CONFIG_IPV6_ROUTER_PREF
6739 .procname = "accept_ra_rtr_pref",
6740 .data = &ipv6_devconf.accept_ra_rtr_pref,
6741 .maxlen = sizeof(int),
6743 .proc_handler = proc_dointvec,
6746 .procname = "router_probe_interval",
6747 .data = &ipv6_devconf.rtr_probe_interval,
6748 .maxlen = sizeof(int),
6750 .proc_handler = proc_dointvec_jiffies,
6752 #ifdef CONFIG_IPV6_ROUTE_INFO
6754 .procname = "accept_ra_rt_info_min_plen",
6755 .data = &ipv6_devconf.accept_ra_rt_info_min_plen,
6756 .maxlen = sizeof(int),
6758 .proc_handler = proc_dointvec,
6761 .procname = "accept_ra_rt_info_max_plen",
6762 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
6763 .maxlen = sizeof(int),
6765 .proc_handler = proc_dointvec,
6770 .procname = "proxy_ndp",
6771 .data = &ipv6_devconf.proxy_ndp,
6772 .maxlen = sizeof(int),
6774 .proc_handler = addrconf_sysctl_proxy_ndp,
6777 .procname = "accept_source_route",
6778 .data = &ipv6_devconf.accept_source_route,
6779 .maxlen = sizeof(int),
6781 .proc_handler = proc_dointvec,
6783 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
6785 .procname = "optimistic_dad",
6786 .data = &ipv6_devconf.optimistic_dad,
6787 .maxlen = sizeof(int),
6789 .proc_handler = proc_dointvec,
6792 .procname = "use_optimistic",
6793 .data = &ipv6_devconf.use_optimistic,
6794 .maxlen = sizeof(int),
6796 .proc_handler = proc_dointvec,
6799 #ifdef CONFIG_IPV6_MROUTE
6801 .procname = "mc_forwarding",
6802 .data = &ipv6_devconf.mc_forwarding,
6803 .maxlen = sizeof(int),
6805 .proc_handler = proc_dointvec,
6809 .procname = "disable_ipv6",
6810 .data = &ipv6_devconf.disable_ipv6,
6811 .maxlen = sizeof(int),
6813 .proc_handler = addrconf_sysctl_disable,
6816 .procname = "accept_dad",
6817 .data = &ipv6_devconf.accept_dad,
6818 .maxlen = sizeof(int),
6820 .proc_handler = proc_dointvec,
6823 .procname = "force_tllao",
6824 .data = &ipv6_devconf.force_tllao,
6825 .maxlen = sizeof(int),
6827 .proc_handler = proc_dointvec
6830 .procname = "ndisc_notify",
6831 .data = &ipv6_devconf.ndisc_notify,
6832 .maxlen = sizeof(int),
6834 .proc_handler = proc_dointvec
6837 .procname = "suppress_frag_ndisc",
6838 .data = &ipv6_devconf.suppress_frag_ndisc,
6839 .maxlen = sizeof(int),
6841 .proc_handler = proc_dointvec
6844 .procname = "accept_ra_from_local",
6845 .data = &ipv6_devconf.accept_ra_from_local,
6846 .maxlen = sizeof(int),
6848 .proc_handler = proc_dointvec,
6851 .procname = "accept_ra_mtu",
6852 .data = &ipv6_devconf.accept_ra_mtu,
6853 .maxlen = sizeof(int),
6855 .proc_handler = proc_dointvec,
6858 .procname = "stable_secret",
6859 .data = &ipv6_devconf.stable_secret,
6860 .maxlen = IPV6_MAX_STRLEN,
6862 .proc_handler = addrconf_sysctl_stable_secret,
6865 .procname = "use_oif_addrs_only",
6866 .data = &ipv6_devconf.use_oif_addrs_only,
6867 .maxlen = sizeof(int),
6869 .proc_handler = proc_dointvec,
6872 .procname = "ignore_routes_with_linkdown",
6873 .data = &ipv6_devconf.ignore_routes_with_linkdown,
6874 .maxlen = sizeof(int),
6876 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
6879 .procname = "drop_unicast_in_l2_multicast",
6880 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
6881 .maxlen = sizeof(int),
6883 .proc_handler = proc_dointvec,
6886 .procname = "drop_unsolicited_na",
6887 .data = &ipv6_devconf.drop_unsolicited_na,
6888 .maxlen = sizeof(int),
6890 .proc_handler = proc_dointvec,
6893 .procname = "keep_addr_on_down",
6894 .data = &ipv6_devconf.keep_addr_on_down,
6895 .maxlen = sizeof(int),
6897 .proc_handler = proc_dointvec,
6901 .procname = "seg6_enabled",
6902 .data = &ipv6_devconf.seg6_enabled,
6903 .maxlen = sizeof(int),
6905 .proc_handler = proc_dointvec,
6907 #ifdef CONFIG_IPV6_SEG6_HMAC
6909 .procname = "seg6_require_hmac",
6910 .data = &ipv6_devconf.seg6_require_hmac,
6911 .maxlen = sizeof(int),
6913 .proc_handler = proc_dointvec,
6917 .procname = "enhanced_dad",
6918 .data = &ipv6_devconf.enhanced_dad,
6919 .maxlen = sizeof(int),
6921 .proc_handler = proc_dointvec,
6924 .procname = "addr_gen_mode",
6925 .data = &ipv6_devconf.addr_gen_mode,
6926 .maxlen = sizeof(int),
6928 .proc_handler = addrconf_sysctl_addr_gen_mode,
6931 .procname = "disable_policy",
6932 .data = &ipv6_devconf.disable_policy,
6933 .maxlen = sizeof(int),
6935 .proc_handler = addrconf_sysctl_disable_policy,
6938 .procname = "ndisc_tclass",
6939 .data = &ipv6_devconf.ndisc_tclass,
6940 .maxlen = sizeof(int),
6942 .proc_handler = proc_dointvec_minmax,
6943 .extra1 = (void *)SYSCTL_ZERO,
6944 .extra2 = (void *)&two_five_five,
6947 .procname = "rpl_seg_enabled",
6948 .data = &ipv6_devconf.rpl_seg_enabled,
6949 .maxlen = sizeof(int),
6951 .proc_handler = proc_dointvec,
6954 .procname = "ioam6_enabled",
6955 .data = &ipv6_devconf.ioam6_enabled,
6956 .maxlen = sizeof(u8),
6958 .proc_handler = proc_dou8vec_minmax,
6959 .extra1 = (void *)SYSCTL_ZERO,
6960 .extra2 = (void *)SYSCTL_ONE,
6963 .procname = "ioam6_id",
6964 .data = &ipv6_devconf.ioam6_id,
6965 .maxlen = sizeof(u32),
6967 .proc_handler = proc_douintvec_minmax,
6968 .extra1 = (void *)SYSCTL_ZERO,
6969 .extra2 = (void *)&ioam6_if_id_max,
6972 .procname = "ioam6_id_wide",
6973 .data = &ipv6_devconf.ioam6_id_wide,
6974 .maxlen = sizeof(u32),
6976 .proc_handler = proc_douintvec,
6983 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
6984 struct inet6_dev *idev, struct ipv6_devconf *p)
6987 struct ctl_table *table;
6988 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
6990 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
6994 for (i = 0; table[i].data; i++) {
6995 table[i].data += (char *)p - (char *)&ipv6_devconf;
6996 /* If one of these is already set, then it is not safe to
6997 * overwrite either of them: this makes proc_dointvec_minmax
7000 if (!table[i].extra1 && !table[i].extra2) {
7001 table[i].extra1 = idev; /* embedded; no ref */
7002 table[i].extra2 = net;
7006 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
7008 p->sysctl_header = register_net_sysctl(net, path, table);
7009 if (!p->sysctl_header)
7012 if (!strcmp(dev_name, "all"))
7013 ifindex = NETCONFA_IFINDEX_ALL;
7014 else if (!strcmp(dev_name, "default"))
7015 ifindex = NETCONFA_IFINDEX_DEFAULT;
7017 ifindex = idev->dev->ifindex;
7018 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
7028 static void __addrconf_sysctl_unregister(struct net *net,
7029 struct ipv6_devconf *p, int ifindex)
7031 struct ctl_table *table;
7033 if (!p->sysctl_header)
7036 table = p->sysctl_header->ctl_table_arg;
7037 unregister_net_sysctl_table(p->sysctl_header);
7038 p->sysctl_header = NULL;
7041 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
7044 static int addrconf_sysctl_register(struct inet6_dev *idev)
7048 if (!sysctl_dev_name_is_allowed(idev->dev->name))
7051 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
7052 &ndisc_ifinfo_sysctl_change);
7055 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
7058 neigh_sysctl_unregister(idev->nd_parms);
7063 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
7065 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf,
7066 idev->dev->ifindex);
7067 neigh_sysctl_unregister(idev->nd_parms);
7073 static int __net_init addrconf_init_net(struct net *net)
7076 struct ipv6_devconf *all, *dflt;
7078 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
7082 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
7084 goto err_alloc_dflt;
7086 if (IS_ENABLED(CONFIG_SYSCTL) &&
7087 !net_eq(net, &init_net)) {
7088 switch (sysctl_devconf_inherit_init_net) {
7089 case 1: /* copy from init_net */
7090 memcpy(all, init_net.ipv6.devconf_all,
7091 sizeof(ipv6_devconf));
7092 memcpy(dflt, init_net.ipv6.devconf_dflt,
7093 sizeof(ipv6_devconf_dflt));
7095 case 3: /* copy from the current netns */
7096 memcpy(all, current->nsproxy->net_ns->ipv6.devconf_all,
7097 sizeof(ipv6_devconf));
7099 current->nsproxy->net_ns->ipv6.devconf_dflt,
7100 sizeof(ipv6_devconf_dflt));
7104 /* use compiled values */
7109 /* these will be inherited by all namespaces */
7110 dflt->autoconf = ipv6_defaults.autoconf;
7111 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
7113 dflt->stable_secret.initialized = false;
7114 all->stable_secret.initialized = false;
7116 net->ipv6.devconf_all = all;
7117 net->ipv6.devconf_dflt = dflt;
7119 #ifdef CONFIG_SYSCTL
7120 err = __addrconf_sysctl_register(net, "all", NULL, all);
7124 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
7130 #ifdef CONFIG_SYSCTL
7132 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
7142 static void __net_exit addrconf_exit_net(struct net *net)
7144 #ifdef CONFIG_SYSCTL
7145 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt,
7146 NETCONFA_IFINDEX_DEFAULT);
7147 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all,
7148 NETCONFA_IFINDEX_ALL);
7150 kfree(net->ipv6.devconf_dflt);
7151 kfree(net->ipv6.devconf_all);
7154 static struct pernet_operations addrconf_ops = {
7155 .init = addrconf_init_net,
7156 .exit = addrconf_exit_net,
7159 static struct rtnl_af_ops inet6_ops __read_mostly = {
7161 .fill_link_af = inet6_fill_link_af,
7162 .get_link_af_size = inet6_get_link_af_size,
7163 .validate_link_af = inet6_validate_link_af,
7164 .set_link_af = inet6_set_link_af,
7168 * Init / cleanup code
7171 int __init addrconf_init(void)
7173 struct inet6_dev *idev;
7176 err = ipv6_addr_label_init();
7178 pr_crit("%s: cannot initialize default policy table: %d\n",
7183 err = register_pernet_subsys(&addrconf_ops);
7187 addrconf_wq = create_workqueue("ipv6_addrconf");
7193 /* The addrconf netdev notifier requires that loopback_dev
7194 * has it's ipv6 private information allocated and setup
7195 * before it can bring up and give link-local addresses
7196 * to other devices which are up.
7198 * Unfortunately, loopback_dev is not necessarily the first
7199 * entry in the global dev_base list of net devices. In fact,
7200 * it is likely to be the very last entry on that list.
7201 * So this causes the notifier registry below to try and
7202 * give link-local addresses to all devices besides loopback_dev
7203 * first, then loopback_dev, which cases all the non-loopback_dev
7204 * devices to fail to get a link-local address.
7206 * So, as a temporary fix, allocate the ipv6 structure for
7207 * loopback_dev first by hand.
7208 * Longer term, all of the dependencies ipv6 has upon the loopback
7209 * device and it being up should be removed.
7212 idev = ipv6_add_dev(init_net.loopback_dev);
7215 err = PTR_ERR(idev);
7219 ip6_route_init_special_entries();
7221 for (i = 0; i < IN6_ADDR_HSIZE; i++)
7222 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
7224 register_netdevice_notifier(&ipv6_dev_notf);
7228 rtnl_af_register(&inet6_ops);
7230 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK,
7231 NULL, inet6_dump_ifinfo, 0);
7235 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR,
7236 inet6_rtm_newaddr, NULL, 0);
7239 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR,
7240 inet6_rtm_deladdr, NULL, 0);
7243 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR,
7244 inet6_rtm_getaddr, inet6_dump_ifaddr,
7245 RTNL_FLAG_DOIT_UNLOCKED);
7248 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST,
7249 NULL, inet6_dump_ifmcaddr, 0);
7252 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST,
7253 NULL, inet6_dump_ifacaddr, 0);
7256 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF,
7257 inet6_netconf_get_devconf,
7258 inet6_netconf_dump_devconf,
7259 RTNL_FLAG_DOIT_UNLOCKED);
7262 err = ipv6_addr_label_rtnl_register();
7268 rtnl_unregister_all(PF_INET6);
7269 rtnl_af_unregister(&inet6_ops);
7270 unregister_netdevice_notifier(&ipv6_dev_notf);
7272 destroy_workqueue(addrconf_wq);
7274 unregister_pernet_subsys(&addrconf_ops);
7276 ipv6_addr_label_cleanup();
7281 void addrconf_cleanup(void)
7283 struct net_device *dev;
7286 unregister_netdevice_notifier(&ipv6_dev_notf);
7287 unregister_pernet_subsys(&addrconf_ops);
7288 ipv6_addr_label_cleanup();
7290 rtnl_af_unregister(&inet6_ops);
7294 /* clean dev list */
7295 for_each_netdev(&init_net, dev) {
7296 if (__in6_dev_get(dev) == NULL)
7298 addrconf_ifdown(dev, true);
7300 addrconf_ifdown(init_net.loopback_dev, true);
7305 spin_lock_bh(&addrconf_hash_lock);
7306 for (i = 0; i < IN6_ADDR_HSIZE; i++)
7307 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
7308 spin_unlock_bh(&addrconf_hash_lock);
7309 cancel_delayed_work(&addr_chk_work);
7312 destroy_workqueue(addrconf_wq);