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>
93 #define INFINITY_LIFE_TIME 0xFFFFFFFF
95 #define IPV6_MAX_STRLEN \
96 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
98 static inline u32 cstamp_delta(unsigned long cstamp)
100 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
103 static inline s32 rfc3315_s14_backoff_init(s32 irt)
105 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */
106 u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt;
107 do_div(tmp, 1000000);
111 static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt)
113 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */
114 u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt;
115 do_div(tmp, 1000000);
116 if ((s32)tmp > mrt) {
117 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */
118 tmp = (900000 + prandom_u32() % 200001) * (u64)mrt;
119 do_div(tmp, 1000000);
125 static int addrconf_sysctl_register(struct inet6_dev *idev);
126 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
128 static inline int addrconf_sysctl_register(struct inet6_dev *idev)
133 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
138 static void ipv6_gen_rnd_iid(struct in6_addr *addr);
140 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
141 static int ipv6_count_addresses(const struct inet6_dev *idev);
142 static int ipv6_generate_stable_address(struct in6_addr *addr,
144 const struct inet6_dev *idev);
146 #define IN6_ADDR_HSIZE_SHIFT 8
147 #define IN6_ADDR_HSIZE (1 << IN6_ADDR_HSIZE_SHIFT)
149 * Configured unicast address hash table
151 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
152 static DEFINE_SPINLOCK(addrconf_hash_lock);
154 static void addrconf_verify(void);
155 static void addrconf_verify_rtnl(void);
156 static void addrconf_verify_work(struct work_struct *);
158 static struct workqueue_struct *addrconf_wq;
159 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
161 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
162 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
164 static void addrconf_type_change(struct net_device *dev,
165 unsigned long event);
166 static int addrconf_ifdown(struct net_device *dev, bool unregister);
168 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
170 const struct net_device *dev,
171 u32 flags, u32 noflags,
174 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
175 static void addrconf_dad_work(struct work_struct *w);
176 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
178 static void addrconf_dad_run(struct inet6_dev *idev, bool restart);
179 static void addrconf_rs_timer(struct timer_list *t);
180 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
181 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
183 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
184 struct prefix_info *pinfo);
186 static struct ipv6_devconf ipv6_devconf __read_mostly = {
188 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
189 .mtu6 = IPV6_MIN_MTU,
191 .accept_redirects = 1,
193 .force_mld_version = 0,
194 .mldv1_unsolicited_report_interval = 10 * HZ,
195 .mldv2_unsolicited_report_interval = HZ,
197 .rtr_solicits = MAX_RTR_SOLICITATIONS,
198 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
199 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
200 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
202 .temp_valid_lft = TEMP_VALID_LIFETIME,
203 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
204 .regen_max_retry = REGEN_MAX_RETRY,
205 .max_desync_factor = MAX_DESYNC_FACTOR,
206 .max_addresses = IPV6_MAX_ADDRESSES,
207 .accept_ra_defrtr = 1,
208 .accept_ra_from_local = 0,
209 .accept_ra_min_hop_limit= 1,
210 .accept_ra_pinfo = 1,
211 #ifdef CONFIG_IPV6_ROUTER_PREF
212 .accept_ra_rtr_pref = 1,
213 .rtr_probe_interval = 60 * HZ,
214 #ifdef CONFIG_IPV6_ROUTE_INFO
215 .accept_ra_rt_info_min_plen = 0,
216 .accept_ra_rt_info_max_plen = 0,
220 .accept_source_route = 0, /* we do not accept RH0 by default. */
223 .suppress_frag_ndisc = 1,
226 .initialized = false,
228 .use_oif_addrs_only = 0,
229 .ignore_routes_with_linkdown = 0,
230 .keep_addr_on_down = 0,
232 #ifdef CONFIG_IPV6_SEG6_HMAC
233 .seg6_require_hmac = 0,
236 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
238 .rpl_seg_enabled = 0,
241 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
243 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
244 .mtu6 = IPV6_MIN_MTU,
246 .accept_redirects = 1,
248 .force_mld_version = 0,
249 .mldv1_unsolicited_report_interval = 10 * HZ,
250 .mldv2_unsolicited_report_interval = HZ,
252 .rtr_solicits = MAX_RTR_SOLICITATIONS,
253 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
254 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
255 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
257 .temp_valid_lft = TEMP_VALID_LIFETIME,
258 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
259 .regen_max_retry = REGEN_MAX_RETRY,
260 .max_desync_factor = MAX_DESYNC_FACTOR,
261 .max_addresses = IPV6_MAX_ADDRESSES,
262 .accept_ra_defrtr = 1,
263 .accept_ra_from_local = 0,
264 .accept_ra_min_hop_limit= 1,
265 .accept_ra_pinfo = 1,
266 #ifdef CONFIG_IPV6_ROUTER_PREF
267 .accept_ra_rtr_pref = 1,
268 .rtr_probe_interval = 60 * HZ,
269 #ifdef CONFIG_IPV6_ROUTE_INFO
270 .accept_ra_rt_info_min_plen = 0,
271 .accept_ra_rt_info_max_plen = 0,
275 .accept_source_route = 0, /* we do not accept RH0 by default. */
278 .suppress_frag_ndisc = 1,
281 .initialized = false,
283 .use_oif_addrs_only = 0,
284 .ignore_routes_with_linkdown = 0,
285 .keep_addr_on_down = 0,
287 #ifdef CONFIG_IPV6_SEG6_HMAC
288 .seg6_require_hmac = 0,
291 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
293 .rpl_seg_enabled = 0,
296 /* Check if link is ready: is it up and is a valid qdisc available */
297 static inline bool addrconf_link_ready(const struct net_device *dev)
299 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev);
302 static void addrconf_del_rs_timer(struct inet6_dev *idev)
304 if (del_timer(&idev->rs_timer))
308 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
310 if (cancel_delayed_work(&ifp->dad_work))
314 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
317 if (!timer_pending(&idev->rs_timer))
319 mod_timer(&idev->rs_timer, jiffies + when);
322 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
326 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay))
330 static int snmp6_alloc_dev(struct inet6_dev *idev)
334 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
335 if (!idev->stats.ipv6)
338 for_each_possible_cpu(i) {
339 struct ipstats_mib *addrconf_stats;
340 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
341 u64_stats_init(&addrconf_stats->syncp);
345 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
347 if (!idev->stats.icmpv6dev)
349 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
351 if (!idev->stats.icmpv6msgdev)
357 kfree(idev->stats.icmpv6dev);
359 free_percpu(idev->stats.ipv6);
364 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
366 struct inet6_dev *ndev;
371 if (dev->mtu < IPV6_MIN_MTU)
372 return ERR_PTR(-EINVAL);
374 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
378 rwlock_init(&ndev->lock);
380 INIT_LIST_HEAD(&ndev->addr_list);
381 timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0);
382 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
384 if (ndev->cnf.stable_secret.initialized)
385 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
387 ndev->cnf.mtu6 = dev->mtu;
388 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
389 if (!ndev->nd_parms) {
393 if (ndev->cnf.forwarding)
394 dev_disable_lro(dev);
395 /* We refer to the device */
398 if (snmp6_alloc_dev(ndev) < 0) {
399 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n",
401 neigh_parms_release(&nd_tbl, ndev->nd_parms);
407 if (snmp6_register_dev(ndev) < 0) {
408 netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n",
409 __func__, dev->name);
413 /* One reference from device. */
414 refcount_set(&ndev->refcnt, 1);
416 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
417 ndev->cnf.accept_dad = -1;
419 #if IS_ENABLED(CONFIG_IPV6_SIT)
420 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
421 pr_info("%s: Disabled Multicast RS\n", dev->name);
422 ndev->cnf.rtr_solicits = 0;
426 INIT_LIST_HEAD(&ndev->tempaddr_list);
427 ndev->desync_factor = U32_MAX;
428 if ((dev->flags&IFF_LOOPBACK) ||
429 dev->type == ARPHRD_TUNNEL ||
430 dev->type == ARPHRD_TUNNEL6 ||
431 dev->type == ARPHRD_SIT ||
432 dev->type == ARPHRD_NONE) {
433 ndev->cnf.use_tempaddr = -1;
436 ndev->token = in6addr_any;
438 if (netif_running(dev) && addrconf_link_ready(dev))
439 ndev->if_flags |= IF_READY;
441 ipv6_mc_init_dev(ndev);
442 ndev->tstamp = jiffies;
443 err = addrconf_sysctl_register(ndev);
445 ipv6_mc_destroy_dev(ndev);
446 snmp6_unregister_dev(ndev);
449 /* protected by rtnl_lock */
450 rcu_assign_pointer(dev->ip6_ptr, ndev);
452 /* Join interface-local all-node multicast group */
453 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
455 /* Join all-node multicast group */
456 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
458 /* Join all-router multicast group if forwarding is set */
459 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
460 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
465 neigh_parms_release(&nd_tbl, ndev->nd_parms);
467 in6_dev_finish_destroy(ndev);
471 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
473 struct inet6_dev *idev;
477 idev = __in6_dev_get(dev);
479 idev = ipv6_add_dev(dev);
484 if (dev->flags&IFF_UP)
489 static int inet6_netconf_msgsize_devconf(int type)
491 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
492 + nla_total_size(4); /* NETCONFA_IFINDEX */
495 if (type == NETCONFA_ALL)
498 if (all || type == NETCONFA_FORWARDING)
499 size += nla_total_size(4);
500 #ifdef CONFIG_IPV6_MROUTE
501 if (all || type == NETCONFA_MC_FORWARDING)
502 size += nla_total_size(4);
504 if (all || type == NETCONFA_PROXY_NEIGH)
505 size += nla_total_size(4);
507 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
508 size += nla_total_size(4);
513 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
514 struct ipv6_devconf *devconf, u32 portid,
515 u32 seq, int event, unsigned int flags,
518 struct nlmsghdr *nlh;
519 struct netconfmsg *ncm;
522 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
527 if (type == NETCONFA_ALL)
530 ncm = nlmsg_data(nlh);
531 ncm->ncm_family = AF_INET6;
533 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
534 goto nla_put_failure;
539 if ((all || type == NETCONFA_FORWARDING) &&
540 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
541 goto nla_put_failure;
542 #ifdef CONFIG_IPV6_MROUTE
543 if ((all || type == NETCONFA_MC_FORWARDING) &&
544 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
545 devconf->mc_forwarding) < 0)
546 goto nla_put_failure;
548 if ((all || type == NETCONFA_PROXY_NEIGH) &&
549 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
550 goto nla_put_failure;
552 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
553 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
554 devconf->ignore_routes_with_linkdown) < 0)
555 goto nla_put_failure;
562 nlmsg_cancel(skb, nlh);
566 void inet6_netconf_notify_devconf(struct net *net, int event, int type,
567 int ifindex, struct ipv6_devconf *devconf)
572 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL);
576 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
579 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
580 WARN_ON(err == -EMSGSIZE);
584 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL);
587 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
590 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
591 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
592 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
593 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
594 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
597 static int inet6_netconf_valid_get_req(struct sk_buff *skb,
598 const struct nlmsghdr *nlh,
600 struct netlink_ext_ack *extack)
604 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) {
605 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf get request");
609 if (!netlink_strict_get_check(skb))
610 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg),
612 devconf_ipv6_policy, extack);
614 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg),
616 devconf_ipv6_policy, extack);
620 for (i = 0; i <= NETCONFA_MAX; i++) {
625 case NETCONFA_IFINDEX:
628 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request");
636 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
637 struct nlmsghdr *nlh,
638 struct netlink_ext_ack *extack)
640 struct net *net = sock_net(in_skb->sk);
641 struct nlattr *tb[NETCONFA_MAX+1];
642 struct inet6_dev *in6_dev = NULL;
643 struct net_device *dev = NULL;
645 struct ipv6_devconf *devconf;
649 err = inet6_netconf_valid_get_req(in_skb, nlh, tb, extack);
653 if (!tb[NETCONFA_IFINDEX])
657 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
659 case NETCONFA_IFINDEX_ALL:
660 devconf = net->ipv6.devconf_all;
662 case NETCONFA_IFINDEX_DEFAULT:
663 devconf = net->ipv6.devconf_dflt;
666 dev = dev_get_by_index(net, ifindex);
669 in6_dev = in6_dev_get(dev);
672 devconf = &in6_dev->cnf;
677 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL);
681 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
682 NETLINK_CB(in_skb).portid,
683 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
686 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
687 WARN_ON(err == -EMSGSIZE);
691 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
694 in6_dev_put(in6_dev);
700 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
701 struct netlink_callback *cb)
703 const struct nlmsghdr *nlh = cb->nlh;
704 struct net *net = sock_net(skb->sk);
707 struct net_device *dev;
708 struct inet6_dev *idev;
709 struct hlist_head *head;
711 if (cb->strict_check) {
712 struct netlink_ext_ack *extack = cb->extack;
713 struct netconfmsg *ncm;
715 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) {
716 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request");
720 if (nlmsg_attrlen(nlh, sizeof(*ncm))) {
721 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request");
727 s_idx = idx = cb->args[1];
729 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
731 head = &net->dev_index_head[h];
733 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
735 hlist_for_each_entry_rcu(dev, head, index_hlist) {
738 idev = __in6_dev_get(dev);
742 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
744 NETLINK_CB(cb->skb).portid,
752 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
758 if (h == NETDEV_HASHENTRIES) {
759 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
760 net->ipv6.devconf_all,
761 NETLINK_CB(cb->skb).portid,
763 RTM_NEWNETCONF, NLM_F_MULTI,
769 if (h == NETDEV_HASHENTRIES + 1) {
770 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
771 net->ipv6.devconf_dflt,
772 NETLINK_CB(cb->skb).portid,
774 RTM_NEWNETCONF, NLM_F_MULTI,
788 static void dev_forward_change(struct inet6_dev *idev)
790 struct net_device *dev;
791 struct inet6_ifaddr *ifa;
796 if (idev->cnf.forwarding)
797 dev_disable_lro(dev);
798 if (dev->flags & IFF_MULTICAST) {
799 if (idev->cnf.forwarding) {
800 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
801 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
802 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
804 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
805 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
806 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
810 list_for_each_entry(ifa, &idev->addr_list, if_list) {
811 if (ifa->flags&IFA_F_TENTATIVE)
813 if (idev->cnf.forwarding)
814 addrconf_join_anycast(ifa);
816 addrconf_leave_anycast(ifa);
818 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
820 dev->ifindex, &idev->cnf);
824 static void addrconf_forward_change(struct net *net, __s32 newf)
826 struct net_device *dev;
827 struct inet6_dev *idev;
829 for_each_netdev(net, dev) {
830 idev = __in6_dev_get(dev);
832 int changed = (!idev->cnf.forwarding) ^ (!newf);
833 idev->cnf.forwarding = newf;
835 dev_forward_change(idev);
840 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
846 return restart_syscall();
848 net = (struct net *)table->extra2;
852 if (p == &net->ipv6.devconf_dflt->forwarding) {
853 if ((!newf) ^ (!old))
854 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
856 NETCONFA_IFINDEX_DEFAULT,
857 net->ipv6.devconf_dflt);
862 if (p == &net->ipv6.devconf_all->forwarding) {
863 int old_dflt = net->ipv6.devconf_dflt->forwarding;
865 net->ipv6.devconf_dflt->forwarding = newf;
866 if ((!newf) ^ (!old_dflt))
867 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
869 NETCONFA_IFINDEX_DEFAULT,
870 net->ipv6.devconf_dflt);
872 addrconf_forward_change(net, newf);
873 if ((!newf) ^ (!old))
874 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
876 NETCONFA_IFINDEX_ALL,
877 net->ipv6.devconf_all);
878 } else if ((!newf) ^ (!old))
879 dev_forward_change((struct inet6_dev *)table->extra1);
883 rt6_purge_dflt_routers(net);
887 static void addrconf_linkdown_change(struct net *net, __s32 newf)
889 struct net_device *dev;
890 struct inet6_dev *idev;
892 for_each_netdev(net, dev) {
893 idev = __in6_dev_get(dev);
895 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
897 idev->cnf.ignore_routes_with_linkdown = newf;
899 inet6_netconf_notify_devconf(dev_net(dev),
901 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
908 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
914 return restart_syscall();
916 net = (struct net *)table->extra2;
920 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
921 if ((!newf) ^ (!old))
922 inet6_netconf_notify_devconf(net,
924 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
925 NETCONFA_IFINDEX_DEFAULT,
926 net->ipv6.devconf_dflt);
931 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
932 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
933 addrconf_linkdown_change(net, newf);
934 if ((!newf) ^ (!old))
935 inet6_netconf_notify_devconf(net,
937 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
938 NETCONFA_IFINDEX_ALL,
939 net->ipv6.devconf_all);
948 /* Nobody refers to this ifaddr, destroy it */
949 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
951 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
953 #ifdef NET_REFCNT_DEBUG
954 pr_debug("%s\n", __func__);
957 in6_dev_put(ifp->idev);
959 if (cancel_delayed_work(&ifp->dad_work))
960 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
963 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
964 pr_warn("Freeing alive inet6 address %p\n", ifp);
972 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
975 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
978 * Each device address list is sorted in order of scope -
979 * global before linklocal.
981 list_for_each(p, &idev->addr_list) {
982 struct inet6_ifaddr *ifa
983 = list_entry(p, struct inet6_ifaddr, if_list);
984 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
988 list_add_tail_rcu(&ifp->if_list, p);
991 static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr)
993 u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net);
995 return hash_32(val, IN6_ADDR_HSIZE_SHIFT);
998 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
999 struct net_device *dev, unsigned int hash)
1001 struct inet6_ifaddr *ifp;
1003 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1004 if (!net_eq(dev_net(ifp->idev->dev), net))
1006 if (ipv6_addr_equal(&ifp->addr, addr)) {
1007 if (!dev || ifp->idev->dev == dev)
1014 static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa)
1016 unsigned int hash = inet6_addr_hash(dev_net(dev), &ifa->addr);
1019 spin_lock(&addrconf_hash_lock);
1021 /* Ignore adding duplicate addresses on an interface */
1022 if (ipv6_chk_same_addr(dev_net(dev), &ifa->addr, dev, hash)) {
1023 netdev_dbg(dev, "ipv6_add_addr: already assigned\n");
1026 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
1029 spin_unlock(&addrconf_hash_lock);
1034 /* On success it returns ifp with increased reference count */
1036 static struct inet6_ifaddr *
1037 ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg,
1038 bool can_block, struct netlink_ext_ack *extack)
1040 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC;
1041 int addr_type = ipv6_addr_type(cfg->pfx);
1042 struct net *net = dev_net(idev->dev);
1043 struct inet6_ifaddr *ifa = NULL;
1044 struct fib6_info *f6i = NULL;
1047 if (addr_type == IPV6_ADDR_ANY ||
1048 (addr_type & IPV6_ADDR_MULTICAST &&
1049 !(cfg->ifa_flags & IFA_F_MCAUTOJOIN)) ||
1050 (!(idev->dev->flags & IFF_LOOPBACK) &&
1051 !netif_is_l3_master(idev->dev) &&
1052 addr_type & IPV6_ADDR_LOOPBACK))
1053 return ERR_PTR(-EADDRNOTAVAIL);
1056 err = -ENODEV; /*XXX*/
1060 if (idev->cnf.disable_ipv6) {
1065 /* validator notifier needs to be blocking;
1066 * do not call in atomic context
1069 struct in6_validator_info i6vi = {
1070 .i6vi_addr = *cfg->pfx,
1075 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi);
1076 err = notifier_to_errno(err);
1081 ifa = kzalloc(sizeof(*ifa), gfp_flags);
1087 f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags);
1094 if (net->ipv6.devconf_all->disable_policy ||
1095 idev->cnf.disable_policy)
1096 f6i->dst_nopolicy = true;
1098 neigh_parms_data_state_setall(idev->nd_parms);
1100 ifa->addr = *cfg->pfx;
1102 ifa->peer_addr = *cfg->peer_pfx;
1104 spin_lock_init(&ifa->lock);
1105 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
1106 INIT_HLIST_NODE(&ifa->addr_lst);
1107 ifa->scope = cfg->scope;
1108 ifa->prefix_len = cfg->plen;
1109 ifa->rt_priority = cfg->rt_priority;
1110 ifa->flags = cfg->ifa_flags;
1111 /* No need to add the TENTATIVE flag for addresses with NODAD */
1112 if (!(cfg->ifa_flags & IFA_F_NODAD))
1113 ifa->flags |= IFA_F_TENTATIVE;
1114 ifa->valid_lft = cfg->valid_lft;
1115 ifa->prefered_lft = cfg->preferred_lft;
1116 ifa->cstamp = ifa->tstamp = jiffies;
1117 ifa->tokenized = false;
1125 refcount_set(&ifa->refcnt, 1);
1129 err = ipv6_add_addr_hash(idev->dev, ifa);
1131 rcu_read_unlock_bh();
1135 write_lock(&idev->lock);
1137 /* Add to inet6_dev unicast addr list. */
1138 ipv6_link_dev_addr(idev, ifa);
1140 if (ifa->flags&IFA_F_TEMPORARY) {
1141 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1146 write_unlock(&idev->lock);
1148 rcu_read_unlock_bh();
1150 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1152 if (unlikely(err < 0)) {
1153 fib6_info_release(f6i);
1157 in6_dev_put(ifa->idev);
1166 enum cleanup_prefix_rt_t {
1167 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1168 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1169 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1173 * Check, whether the prefix for ifp would still need a prefix route
1174 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1177 * 1) we don't purge prefix if address was not permanent.
1178 * prefix is managed by its own lifetime.
1179 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1180 * 3) if there are no addresses, delete prefix.
1181 * 4) if there are still other permanent address(es),
1182 * corresponding prefix is still permanent.
1183 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1184 * don't purge the prefix, assume user space is managing it.
1185 * 6) otherwise, update prefix lifetime to the
1186 * longest valid lifetime among the corresponding
1187 * addresses on the device.
1188 * Note: subsequent RA will update lifetime.
1190 static enum cleanup_prefix_rt_t
1191 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1193 struct inet6_ifaddr *ifa;
1194 struct inet6_dev *idev = ifp->idev;
1195 unsigned long lifetime;
1196 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1200 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1203 if (ifa->prefix_len != ifp->prefix_len ||
1204 !ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1207 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1208 return CLEANUP_PREFIX_RT_NOP;
1210 action = CLEANUP_PREFIX_RT_EXPIRE;
1212 spin_lock(&ifa->lock);
1214 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1216 * Note: Because this address is
1217 * not permanent, lifetime <
1218 * LONG_MAX / HZ here.
1220 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1221 *expires = ifa->tstamp + lifetime * HZ;
1222 spin_unlock(&ifa->lock);
1229 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires,
1230 bool del_rt, bool del_peer)
1232 struct fib6_info *f6i;
1234 f6i = addrconf_get_prefix_route(del_peer ? &ifp->peer_addr : &ifp->addr,
1236 ifp->idev->dev, 0, RTF_DEFAULT, true);
1239 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false);
1241 if (!(f6i->fib6_flags & RTF_EXPIRES))
1242 fib6_set_expires(f6i, expires);
1243 fib6_info_release(f6i);
1249 /* This function wants to get referenced ifp and releases it before return */
1251 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1254 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1255 unsigned long expires;
1259 spin_lock_bh(&ifp->lock);
1261 ifp->state = INET6_IFADDR_STATE_DEAD;
1262 spin_unlock_bh(&ifp->lock);
1264 if (state == INET6_IFADDR_STATE_DEAD)
1267 spin_lock_bh(&addrconf_hash_lock);
1268 hlist_del_init_rcu(&ifp->addr_lst);
1269 spin_unlock_bh(&addrconf_hash_lock);
1271 write_lock_bh(&ifp->idev->lock);
1273 if (ifp->flags&IFA_F_TEMPORARY) {
1274 list_del(&ifp->tmp_list);
1276 in6_ifa_put(ifp->ifpub);
1282 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1283 action = check_cleanup_prefix_route(ifp, &expires);
1285 list_del_rcu(&ifp->if_list);
1288 write_unlock_bh(&ifp->idev->lock);
1290 addrconf_del_dad_work(ifp);
1292 ipv6_ifa_notify(RTM_DELADDR, ifp);
1294 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1296 if (action != CLEANUP_PREFIX_RT_NOP) {
1297 cleanup_prefix_route(ifp, expires,
1298 action == CLEANUP_PREFIX_RT_DEL, false);
1301 /* clean up prefsrc entries */
1302 rt6_remove_prefsrc(ifp);
1307 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, bool block)
1309 struct inet6_dev *idev = ifp->idev;
1310 unsigned long tmp_tstamp, age;
1311 unsigned long regen_advance;
1312 unsigned long now = jiffies;
1313 s32 cnf_temp_preferred_lft;
1314 struct inet6_ifaddr *ift;
1315 struct ifa6_config cfg;
1316 long max_desync_factor;
1317 struct in6_addr addr;
1320 write_lock_bh(&idev->lock);
1324 if (idev->cnf.use_tempaddr <= 0) {
1325 write_unlock_bh(&idev->lock);
1326 pr_info("%s: use_tempaddr is disabled\n", __func__);
1331 spin_lock_bh(&ifp->lock);
1332 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1333 idev->cnf.use_tempaddr = -1; /*XXX*/
1334 spin_unlock_bh(&ifp->lock);
1335 write_unlock_bh(&idev->lock);
1336 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1343 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1344 ipv6_gen_rnd_iid(&addr);
1346 age = (now - ifp->tstamp) / HZ;
1348 regen_advance = idev->cnf.regen_max_retry *
1349 idev->cnf.dad_transmits *
1350 max(NEIGH_VAR(idev->nd_parms, RETRANS_TIME), HZ/100) / HZ;
1352 /* recalculate max_desync_factor each time and update
1353 * idev->desync_factor if it's larger
1355 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
1356 max_desync_factor = min_t(__u32,
1357 idev->cnf.max_desync_factor,
1358 cnf_temp_preferred_lft - regen_advance);
1360 if (unlikely(idev->desync_factor > max_desync_factor)) {
1361 if (max_desync_factor > 0) {
1362 get_random_bytes(&idev->desync_factor,
1363 sizeof(idev->desync_factor));
1364 idev->desync_factor %= max_desync_factor;
1366 idev->desync_factor = 0;
1370 memset(&cfg, 0, sizeof(cfg));
1371 cfg.valid_lft = min_t(__u32, ifp->valid_lft,
1372 idev->cnf.temp_valid_lft + age);
1373 cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor;
1374 cfg.preferred_lft = min_t(__u32, ifp->prefered_lft, cfg.preferred_lft);
1376 cfg.plen = ifp->prefix_len;
1377 tmp_tstamp = ifp->tstamp;
1378 spin_unlock_bh(&ifp->lock);
1380 write_unlock_bh(&idev->lock);
1382 /* A temporary address is created only if this calculated Preferred
1383 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1384 * an implementation must not create a temporary address with a zero
1385 * Preferred Lifetime.
1386 * Use age calculation as in addrconf_verify to avoid unnecessary
1387 * temporary addresses being generated.
1389 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1390 if (cfg.preferred_lft <= regen_advance + age) {
1397 cfg.ifa_flags = IFA_F_TEMPORARY;
1398 /* set in addrconf_prefix_rcv() */
1399 if (ifp->flags & IFA_F_OPTIMISTIC)
1400 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
1403 cfg.scope = ipv6_addr_scope(cfg.pfx);
1405 ift = ipv6_add_addr(idev, &cfg, block, NULL);
1409 pr_info("%s: retry temporary address regeneration\n", __func__);
1410 write_lock_bh(&idev->lock);
1414 spin_lock_bh(&ift->lock);
1417 ift->tstamp = tmp_tstamp;
1418 spin_unlock_bh(&ift->lock);
1420 addrconf_dad_start(ift);
1428 * Choose an appropriate source address (RFC3484)
1431 IPV6_SADDR_RULE_INIT = 0,
1432 IPV6_SADDR_RULE_LOCAL,
1433 IPV6_SADDR_RULE_SCOPE,
1434 IPV6_SADDR_RULE_PREFERRED,
1435 #ifdef CONFIG_IPV6_MIP6
1436 IPV6_SADDR_RULE_HOA,
1438 IPV6_SADDR_RULE_OIF,
1439 IPV6_SADDR_RULE_LABEL,
1440 IPV6_SADDR_RULE_PRIVACY,
1441 IPV6_SADDR_RULE_ORCHID,
1442 IPV6_SADDR_RULE_PREFIX,
1443 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1444 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1449 struct ipv6_saddr_score {
1452 struct inet6_ifaddr *ifa;
1453 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1458 struct ipv6_saddr_dst {
1459 const struct in6_addr *addr;
1466 static inline int ipv6_saddr_preferred(int type)
1468 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1473 static bool ipv6_use_optimistic_addr(struct net *net,
1474 struct inet6_dev *idev)
1476 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1479 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1481 if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic)
1490 static bool ipv6_allow_optimistic_dad(struct net *net,
1491 struct inet6_dev *idev)
1493 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1496 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1505 static int ipv6_get_saddr_eval(struct net *net,
1506 struct ipv6_saddr_score *score,
1507 struct ipv6_saddr_dst *dst,
1512 if (i <= score->rule) {
1514 case IPV6_SADDR_RULE_SCOPE:
1515 ret = score->scopedist;
1517 case IPV6_SADDR_RULE_PREFIX:
1518 ret = score->matchlen;
1521 ret = !!test_bit(i, score->scorebits);
1527 case IPV6_SADDR_RULE_INIT:
1528 /* Rule 0: remember if hiscore is not ready yet */
1531 case IPV6_SADDR_RULE_LOCAL:
1532 /* Rule 1: Prefer same address */
1533 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1535 case IPV6_SADDR_RULE_SCOPE:
1536 /* Rule 2: Prefer appropriate scope
1541 * ---+--+-+---> scope
1543 * | d is scope of the destination.
1545 * | \ <- smaller scope is better if
1546 * B-15 | \ if scope is enough for destination.
1547 * | ret = B - scope (-1 <= scope >= d <= 15).
1549 * |/ <- greater is better
1550 * -C / if scope is not enough for destination.
1551 * /| ret = scope - C (-1 <= d < scope <= 15).
1553 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1554 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1555 * Assume B = 0 and we get C > 29.
1557 ret = __ipv6_addr_src_scope(score->addr_type);
1558 if (ret >= dst->scope)
1561 ret -= 128; /* 30 is enough */
1562 score->scopedist = ret;
1564 case IPV6_SADDR_RULE_PREFERRED:
1566 /* Rule 3: Avoid deprecated and optimistic addresses */
1567 u8 avoid = IFA_F_DEPRECATED;
1569 if (!ipv6_use_optimistic_addr(net, score->ifa->idev))
1570 avoid |= IFA_F_OPTIMISTIC;
1571 ret = ipv6_saddr_preferred(score->addr_type) ||
1572 !(score->ifa->flags & avoid);
1575 #ifdef CONFIG_IPV6_MIP6
1576 case IPV6_SADDR_RULE_HOA:
1578 /* Rule 4: Prefer home address */
1579 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1580 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1584 case IPV6_SADDR_RULE_OIF:
1585 /* Rule 5: Prefer outgoing interface */
1586 ret = (!dst->ifindex ||
1587 dst->ifindex == score->ifa->idev->dev->ifindex);
1589 case IPV6_SADDR_RULE_LABEL:
1590 /* Rule 6: Prefer matching label */
1591 ret = ipv6_addr_label(net,
1592 &score->ifa->addr, score->addr_type,
1593 score->ifa->idev->dev->ifindex) == dst->label;
1595 case IPV6_SADDR_RULE_PRIVACY:
1597 /* Rule 7: Prefer public address
1598 * Note: prefer temporary address if use_tempaddr >= 2
1600 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1601 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1602 score->ifa->idev->cnf.use_tempaddr >= 2;
1603 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1606 case IPV6_SADDR_RULE_ORCHID:
1607 /* Rule 8-: Prefer ORCHID vs ORCHID or
1608 * non-ORCHID vs non-ORCHID
1610 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1611 ipv6_addr_orchid(dst->addr));
1613 case IPV6_SADDR_RULE_PREFIX:
1614 /* Rule 8: Use longest matching prefix */
1615 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1616 if (ret > score->ifa->prefix_len)
1617 ret = score->ifa->prefix_len;
1618 score->matchlen = ret;
1620 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1621 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1622 /* Optimistic addresses still have lower precedence than other
1623 * preferred addresses.
1625 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1633 __set_bit(i, score->scorebits);
1639 static int __ipv6_dev_get_saddr(struct net *net,
1640 struct ipv6_saddr_dst *dst,
1641 struct inet6_dev *idev,
1642 struct ipv6_saddr_score *scores,
1645 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1647 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) {
1651 * - Tentative Address (RFC2462 section 5.4)
1652 * - A tentative address is not considered
1653 * "assigned to an interface" in the traditional
1654 * sense, unless it is also flagged as optimistic.
1655 * - Candidate Source Address (section 4)
1656 * - In any case, anycast addresses, multicast
1657 * addresses, and the unspecified address MUST
1658 * NOT be included in a candidate set.
1660 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1661 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1664 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1666 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1667 score->addr_type & IPV6_ADDR_MULTICAST)) {
1668 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1674 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1676 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1677 int minihiscore, miniscore;
1679 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1680 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1682 if (minihiscore > miniscore) {
1683 if (i == IPV6_SADDR_RULE_SCOPE &&
1684 score->scopedist > 0) {
1687 * each remaining entry
1688 * has too small (not enough)
1689 * scope, because ifa entries
1690 * are sorted by their scope
1696 } else if (minihiscore < miniscore) {
1697 swap(hiscore, score);
1698 hiscore_idx = 1 - hiscore_idx;
1700 /* restore our iterator */
1701 score->ifa = hiscore->ifa;
1711 static int ipv6_get_saddr_master(struct net *net,
1712 const struct net_device *dst_dev,
1713 const struct net_device *master,
1714 struct ipv6_saddr_dst *dst,
1715 struct ipv6_saddr_score *scores,
1718 struct inet6_dev *idev;
1720 idev = __in6_dev_get(dst_dev);
1722 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1723 scores, hiscore_idx);
1725 idev = __in6_dev_get(master);
1727 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1728 scores, hiscore_idx);
1733 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1734 const struct in6_addr *daddr, unsigned int prefs,
1735 struct in6_addr *saddr)
1737 struct ipv6_saddr_score scores[2], *hiscore;
1738 struct ipv6_saddr_dst dst;
1739 struct inet6_dev *idev;
1740 struct net_device *dev;
1742 bool use_oif_addr = false;
1743 int hiscore_idx = 0;
1746 dst_type = __ipv6_addr_type(daddr);
1748 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1749 dst.scope = __ipv6_addr_src_scope(dst_type);
1750 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1753 scores[hiscore_idx].rule = -1;
1754 scores[hiscore_idx].ifa = NULL;
1758 /* Candidate Source Address (section 4)
1759 * - multicast and link-local destination address,
1760 * the set of candidate source address MUST only
1761 * include addresses assigned to interfaces
1762 * belonging to the same link as the outgoing
1764 * (- For site-local destination addresses, the
1765 * set of candidate source addresses MUST only
1766 * include addresses assigned to interfaces
1767 * belonging to the same site as the outgoing
1769 * - "It is RECOMMENDED that the candidate source addresses
1770 * be the set of unicast addresses assigned to the
1771 * interface that will be used to send to the destination
1772 * (the 'outgoing' interface)." (RFC 6724)
1775 idev = __in6_dev_get(dst_dev);
1776 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1777 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1778 (idev && idev->cnf.use_oif_addrs_only)) {
1779 use_oif_addr = true;
1785 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1787 const struct net_device *master;
1790 /* if dst_dev exists and is enslaved to an L3 device, then
1791 * prefer addresses from dst_dev and then the master over
1792 * any other enslaved devices in the L3 domain.
1794 master = l3mdev_master_dev_rcu(dst_dev);
1796 master_idx = master->ifindex;
1798 hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1800 scores, hiscore_idx);
1802 if (scores[hiscore_idx].ifa)
1806 for_each_netdev_rcu(net, dev) {
1807 /* only consider addresses on devices in the
1810 if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1812 idev = __in6_dev_get(dev);
1815 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1820 hiscore = &scores[hiscore_idx];
1822 ret = -EADDRNOTAVAIL;
1824 *saddr = hiscore->ifa->addr;
1829 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1831 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1834 struct inet6_ifaddr *ifp;
1835 int err = -EADDRNOTAVAIL;
1837 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1838 if (ifp->scope > IFA_LINK)
1840 if (ifp->scope == IFA_LINK &&
1841 !(ifp->flags & banned_flags)) {
1850 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1853 struct inet6_dev *idev;
1854 int err = -EADDRNOTAVAIL;
1857 idev = __in6_dev_get(dev);
1859 read_lock_bh(&idev->lock);
1860 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1861 read_unlock_bh(&idev->lock);
1867 static int ipv6_count_addresses(const struct inet6_dev *idev)
1869 const struct inet6_ifaddr *ifp;
1873 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list)
1879 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1880 const struct net_device *dev, int strict)
1882 return ipv6_chk_addr_and_flags(net, addr, dev, !dev,
1883 strict, IFA_F_TENTATIVE);
1885 EXPORT_SYMBOL(ipv6_chk_addr);
1887 /* device argument is used to find the L3 domain of interest. If
1888 * skip_dev_check is set, then the ifp device is not checked against
1889 * the passed in dev argument. So the 2 cases for addresses checks are:
1890 * 1. does the address exist in the L3 domain that dev is part of
1891 * (skip_dev_check = true), or
1893 * 2. does the address exist on the specific device
1894 * (skip_dev_check = false)
1896 static struct net_device *
1897 __ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1898 const struct net_device *dev, bool skip_dev_check,
1899 int strict, u32 banned_flags)
1901 unsigned int hash = inet6_addr_hash(net, addr);
1902 struct net_device *l3mdev, *ndev;
1903 struct inet6_ifaddr *ifp;
1908 l3mdev = l3mdev_master_dev_rcu(dev);
1912 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1913 ndev = ifp->idev->dev;
1914 if (!net_eq(dev_net(ndev), net))
1917 if (l3mdev_master_dev_rcu(ndev) != l3mdev)
1920 /* Decouple optimistic from tentative for evaluation here.
1921 * Ban optimistic addresses explicitly, when required.
1923 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1924 ? (ifp->flags&~IFA_F_TENTATIVE)
1926 if (ipv6_addr_equal(&ifp->addr, addr) &&
1927 !(ifp_flags&banned_flags) &&
1928 (!dev || ndev == dev ||
1929 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1939 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1940 const struct net_device *dev, bool skip_dev_check,
1941 int strict, u32 banned_flags)
1943 return __ipv6_chk_addr_and_flags(net, addr, dev, skip_dev_check,
1944 strict, banned_flags) ? 1 : 0;
1946 EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1949 /* Compares an address/prefix_len with addresses on device @dev.
1950 * If one is found it returns true.
1952 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1953 const unsigned int prefix_len, struct net_device *dev)
1955 const struct inet6_ifaddr *ifa;
1956 const struct inet6_dev *idev;
1960 idev = __in6_dev_get(dev);
1962 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
1963 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1972 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1974 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1976 const struct inet6_ifaddr *ifa;
1977 const struct inet6_dev *idev;
1982 idev = __in6_dev_get(dev);
1984 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
1985 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1994 EXPORT_SYMBOL(ipv6_chk_prefix);
1997 * ipv6_dev_find - find the first device with a given source address.
1998 * @net: the net namespace
1999 * @addr: the source address
2000 * @dev: used to find the L3 domain of interest
2002 * The caller should be protected by RCU, or RTNL.
2004 struct net_device *ipv6_dev_find(struct net *net, const struct in6_addr *addr,
2005 struct net_device *dev)
2007 return __ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1,
2010 EXPORT_SYMBOL(ipv6_dev_find);
2012 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
2013 struct net_device *dev, int strict)
2015 unsigned int hash = inet6_addr_hash(net, addr);
2016 struct inet6_ifaddr *ifp, *result = NULL;
2019 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
2020 if (!net_eq(dev_net(ifp->idev->dev), net))
2022 if (ipv6_addr_equal(&ifp->addr, addr)) {
2023 if (!dev || ifp->idev->dev == dev ||
2024 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
2036 /* Gets referenced address, destroys ifaddr */
2038 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
2041 ifp->flags |= IFA_F_DADFAILED;
2043 if (ifp->flags&IFA_F_TEMPORARY) {
2044 struct inet6_ifaddr *ifpub;
2045 spin_lock_bh(&ifp->lock);
2048 in6_ifa_hold(ifpub);
2049 spin_unlock_bh(&ifp->lock);
2050 ipv6_create_tempaddr(ifpub, true);
2053 spin_unlock_bh(&ifp->lock);
2056 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) {
2057 spin_lock_bh(&ifp->lock);
2058 addrconf_del_dad_work(ifp);
2059 ifp->flags |= IFA_F_TENTATIVE;
2061 ifp->flags &= ~IFA_F_OPTIMISTIC;
2062 spin_unlock_bh(&ifp->lock);
2064 ipv6_ifa_notify(0, ifp);
2071 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
2075 spin_lock_bh(&ifp->lock);
2076 if (ifp->state == INET6_IFADDR_STATE_DAD) {
2077 ifp->state = INET6_IFADDR_STATE_POSTDAD;
2080 spin_unlock_bh(&ifp->lock);
2085 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp)
2087 struct inet6_dev *idev = ifp->idev;
2088 struct net *net = dev_net(ifp->idev->dev);
2090 if (addrconf_dad_end(ifp)) {
2095 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n",
2096 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source);
2098 spin_lock_bh(&ifp->lock);
2100 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
2101 struct in6_addr new_addr;
2102 struct inet6_ifaddr *ifp2;
2103 int retries = ifp->stable_privacy_retry + 1;
2104 struct ifa6_config cfg = {
2106 .plen = ifp->prefix_len,
2107 .ifa_flags = ifp->flags,
2108 .valid_lft = ifp->valid_lft,
2109 .preferred_lft = ifp->prefered_lft,
2110 .scope = ifp->scope,
2113 if (retries > net->ipv6.sysctl.idgen_retries) {
2114 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
2115 ifp->idev->dev->name);
2119 new_addr = ifp->addr;
2120 if (ipv6_generate_stable_address(&new_addr, retries,
2124 spin_unlock_bh(&ifp->lock);
2126 if (idev->cnf.max_addresses &&
2127 ipv6_count_addresses(idev) >=
2128 idev->cnf.max_addresses)
2131 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
2132 ifp->idev->dev->name);
2134 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL);
2138 spin_lock_bh(&ifp2->lock);
2139 ifp2->stable_privacy_retry = retries;
2140 ifp2->state = INET6_IFADDR_STATE_PREDAD;
2141 spin_unlock_bh(&ifp2->lock);
2143 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
2146 spin_lock_bh(&ifp->lock);
2150 /* transition from _POSTDAD to _ERRDAD */
2151 ifp->state = INET6_IFADDR_STATE_ERRDAD;
2152 spin_unlock_bh(&ifp->lock);
2154 addrconf_mod_dad_work(ifp, 0);
2158 /* Join to solicited addr multicast group.
2159 * caller must hold RTNL */
2160 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
2162 struct in6_addr maddr;
2164 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2167 addrconf_addr_solict_mult(addr, &maddr);
2168 ipv6_dev_mc_inc(dev, &maddr);
2171 /* caller must hold RTNL */
2172 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
2174 struct in6_addr maddr;
2176 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2179 addrconf_addr_solict_mult(addr, &maddr);
2180 __ipv6_dev_mc_dec(idev, &maddr);
2183 /* caller must hold RTNL */
2184 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
2186 struct in6_addr addr;
2188 if (ifp->prefix_len >= 127) /* RFC 6164 */
2190 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2191 if (ipv6_addr_any(&addr))
2193 __ipv6_dev_ac_inc(ifp->idev, &addr);
2196 /* caller must hold RTNL */
2197 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
2199 struct in6_addr addr;
2201 if (ifp->prefix_len >= 127) /* RFC 6164 */
2203 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2204 if (ipv6_addr_any(&addr))
2206 __ipv6_dev_ac_dec(ifp->idev, &addr);
2209 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev)
2211 switch (dev->addr_len) {
2213 memcpy(eui, dev->dev_addr, 3);
2216 memcpy(eui + 5, dev->dev_addr + 3, 3);
2218 case EUI64_ADDR_LEN:
2219 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2229 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2231 union fwnet_hwaddr *ha;
2233 if (dev->addr_len != FWNET_ALEN)
2236 ha = (union fwnet_hwaddr *)dev->dev_addr;
2238 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2243 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2245 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2246 if (dev->addr_len != ARCNET_ALEN)
2249 eui[7] = *(u8 *)dev->dev_addr;
2253 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2255 if (dev->addr_len != INFINIBAND_ALEN)
2257 memcpy(eui, dev->dev_addr + 12, 8);
2262 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
2266 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2267 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2268 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2269 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2270 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2271 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2275 memcpy(eui + 4, &addr, 4);
2279 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2281 if (dev->priv_flags & IFF_ISATAP)
2282 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2286 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2288 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2291 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2293 memcpy(eui, dev->perm_addr, 3);
2294 memcpy(eui + 5, dev->perm_addr + 3, 3);
2301 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2303 switch (dev->type) {
2306 return addrconf_ifid_eui48(eui, dev);
2308 return addrconf_ifid_arcnet(eui, dev);
2309 case ARPHRD_INFINIBAND:
2310 return addrconf_ifid_infiniband(eui, dev);
2312 return addrconf_ifid_sit(eui, dev);
2315 return addrconf_ifid_gre(eui, dev);
2316 case ARPHRD_6LOWPAN:
2317 return addrconf_ifid_6lowpan(eui, dev);
2318 case ARPHRD_IEEE1394:
2319 return addrconf_ifid_ieee1394(eui, dev);
2320 case ARPHRD_TUNNEL6:
2323 return addrconf_ifid_ip6tnl(eui, dev);
2328 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2331 struct inet6_ifaddr *ifp;
2333 read_lock_bh(&idev->lock);
2334 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2335 if (ifp->scope > IFA_LINK)
2337 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2338 memcpy(eui, ifp->addr.s6_addr+8, 8);
2343 read_unlock_bh(&idev->lock);
2347 /* Generation of a randomized Interface Identifier
2348 * draft-ietf-6man-rfc4941bis, Section 3.3.1
2351 static void ipv6_gen_rnd_iid(struct in6_addr *addr)
2354 get_random_bytes(&addr->s6_addr[8], 8);
2356 /* <draft-ietf-6man-rfc4941bis-08.txt>, Section 3.3.1:
2357 * check if generated address is not inappropriate:
2359 * - Reserved IPv6 Interface Identifers
2360 * - XXX: already assigned to an address on the device
2363 /* Subnet-router anycast: 0000:0000:0000:0000 */
2364 if (!(addr->s6_addr32[2] | addr->s6_addr32[3]))
2367 /* IANA Ethernet block: 0200:5EFF:FE00:0000-0200:5EFF:FE00:5212
2368 * Proxy Mobile IPv6: 0200:5EFF:FE00:5213
2369 * IANA Ethernet block: 0200:5EFF:FE00:5214-0200:5EFF:FEFF:FFFF
2371 if (ntohl(addr->s6_addr32[2]) == 0x02005eff &&
2372 (ntohl(addr->s6_addr32[3]) & 0Xff000000) == 0xfe000000)
2375 /* Reserved subnet anycast addresses */
2376 if (ntohl(addr->s6_addr32[2]) == 0xfdffffff &&
2377 ntohl(addr->s6_addr32[3]) >= 0Xffffff80)
2386 addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric,
2387 struct net_device *dev, unsigned long expires,
2388 u32 flags, gfp_t gfp_flags)
2390 struct fib6_config cfg = {
2391 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
2392 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF,
2393 .fc_ifindex = dev->ifindex,
2394 .fc_expires = expires,
2396 .fc_flags = RTF_UP | flags,
2397 .fc_nlinfo.nl_net = dev_net(dev),
2398 .fc_protocol = RTPROT_KERNEL,
2399 .fc_type = RTN_UNICAST,
2404 /* Prevent useless cloning on PtP SIT.
2405 This thing is done here expecting that the whole
2406 class of non-broadcast devices need not cloning.
2408 #if IS_ENABLED(CONFIG_IPV6_SIT)
2409 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2410 cfg.fc_flags |= RTF_NONEXTHOP;
2413 ip6_route_add(&cfg, gfp_flags, NULL);
2417 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2419 const struct net_device *dev,
2420 u32 flags, u32 noflags,
2423 struct fib6_node *fn;
2424 struct fib6_info *rt = NULL;
2425 struct fib6_table *table;
2426 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
2428 table = fib6_get_table(dev_net(dev), tb_id);
2433 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true);
2437 for_each_fib6_node_rt_rcu(fn) {
2438 /* prefix routes only use builtin fib6_nh */
2442 if (rt->fib6_nh->fib_nh_dev->ifindex != dev->ifindex)
2444 if (no_gw && rt->fib6_nh->fib_nh_gw_family)
2446 if ((rt->fib6_flags & flags) != flags)
2448 if ((rt->fib6_flags & noflags) != 0)
2450 if (!fib6_info_hold_safe(rt))
2460 /* Create "default" multicast route to the interface */
2462 static void addrconf_add_mroute(struct net_device *dev)
2464 struct fib6_config cfg = {
2465 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2466 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2467 .fc_ifindex = dev->ifindex,
2470 .fc_type = RTN_MULTICAST,
2471 .fc_nlinfo.nl_net = dev_net(dev),
2472 .fc_protocol = RTPROT_KERNEL,
2475 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2477 ip6_route_add(&cfg, GFP_KERNEL, NULL);
2480 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2482 struct inet6_dev *idev;
2486 idev = ipv6_find_idev(dev);
2490 if (idev->cnf.disable_ipv6)
2491 return ERR_PTR(-EACCES);
2493 /* Add default multicast route */
2494 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
2495 addrconf_add_mroute(dev);
2500 static void manage_tempaddrs(struct inet6_dev *idev,
2501 struct inet6_ifaddr *ifp,
2502 __u32 valid_lft, __u32 prefered_lft,
2503 bool create, unsigned long now)
2506 struct inet6_ifaddr *ift;
2508 read_lock_bh(&idev->lock);
2509 /* update all temporary addresses in the list */
2510 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2511 int age, max_valid, max_prefered;
2513 if (ifp != ift->ifpub)
2516 /* RFC 4941 section 3.3:
2517 * If a received option will extend the lifetime of a public
2518 * address, the lifetimes of temporary addresses should
2519 * be extended, subject to the overall constraint that no
2520 * temporary addresses should ever remain "valid" or "preferred"
2521 * for a time longer than (TEMP_VALID_LIFETIME) or
2522 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2524 age = (now - ift->cstamp) / HZ;
2525 max_valid = idev->cnf.temp_valid_lft - age;
2529 max_prefered = idev->cnf.temp_prefered_lft -
2530 idev->desync_factor - age;
2531 if (max_prefered < 0)
2534 if (valid_lft > max_valid)
2535 valid_lft = max_valid;
2537 if (prefered_lft > max_prefered)
2538 prefered_lft = max_prefered;
2540 spin_lock(&ift->lock);
2542 ift->valid_lft = valid_lft;
2543 ift->prefered_lft = prefered_lft;
2545 if (prefered_lft > 0)
2546 ift->flags &= ~IFA_F_DEPRECATED;
2548 spin_unlock(&ift->lock);
2549 if (!(flags&IFA_F_TENTATIVE))
2550 ipv6_ifa_notify(0, ift);
2553 if ((create || list_empty(&idev->tempaddr_list)) &&
2554 idev->cnf.use_tempaddr > 0) {
2555 /* When a new public address is created as described
2556 * in [ADDRCONF], also create a new temporary address.
2557 * Also create a temporary address if it's enabled but
2558 * no temporary address currently exists.
2560 read_unlock_bh(&idev->lock);
2561 ipv6_create_tempaddr(ifp, false);
2563 read_unlock_bh(&idev->lock);
2567 static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2569 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2570 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2573 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2574 const struct prefix_info *pinfo,
2575 struct inet6_dev *in6_dev,
2576 const struct in6_addr *addr, int addr_type,
2577 u32 addr_flags, bool sllao, bool tokenized,
2578 __u32 valid_lft, u32 prefered_lft)
2580 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2583 if (!ifp && valid_lft) {
2584 int max_addresses = in6_dev->cnf.max_addresses;
2585 struct ifa6_config cfg = {
2587 .plen = pinfo->prefix_len,
2588 .ifa_flags = addr_flags,
2589 .valid_lft = valid_lft,
2590 .preferred_lft = prefered_lft,
2591 .scope = addr_type & IPV6_ADDR_SCOPE_MASK,
2594 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2595 if ((net->ipv6.devconf_all->optimistic_dad ||
2596 in6_dev->cnf.optimistic_dad) &&
2597 !net->ipv6.devconf_all->forwarding && sllao)
2598 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
2601 /* Do not allow to create too much of autoconfigured
2602 * addresses; this would be too easy way to crash kernel.
2604 if (!max_addresses ||
2605 ipv6_count_addresses(in6_dev) < max_addresses)
2606 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL);
2608 if (IS_ERR_OR_NULL(ifp))
2612 spin_lock_bh(&ifp->lock);
2613 ifp->flags |= IFA_F_MANAGETEMPADDR;
2614 ifp->cstamp = jiffies;
2615 ifp->tokenized = tokenized;
2616 spin_unlock_bh(&ifp->lock);
2617 addrconf_dad_start(ifp);
2625 /* Update lifetime (RFC4862 5.5.3 e)
2626 * We deviate from RFC4862 by honoring all Valid Lifetimes to
2627 * improve the reaction of SLAAC to renumbering events
2628 * (draft-gont-6man-slaac-renum-06, Section 4.2)
2630 spin_lock_bh(&ifp->lock);
2632 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2633 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2637 if (!create && stored_lft) {
2638 ifp->valid_lft = valid_lft;
2639 ifp->prefered_lft = prefered_lft;
2642 ifp->flags &= ~IFA_F_DEPRECATED;
2643 spin_unlock_bh(&ifp->lock);
2645 if (!(flags&IFA_F_TENTATIVE))
2646 ipv6_ifa_notify(0, ifp);
2648 spin_unlock_bh(&ifp->lock);
2650 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2659 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
2661 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2663 struct prefix_info *pinfo;
2668 struct inet6_dev *in6_dev;
2669 struct net *net = dev_net(dev);
2671 pinfo = (struct prefix_info *) opt;
2673 if (len < sizeof(struct prefix_info)) {
2674 netdev_dbg(dev, "addrconf: prefix option too short\n");
2679 * Validation checks ([ADDRCONF], page 19)
2682 addr_type = ipv6_addr_type(&pinfo->prefix);
2684 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2687 valid_lft = ntohl(pinfo->valid);
2688 prefered_lft = ntohl(pinfo->prefered);
2690 if (prefered_lft > valid_lft) {
2691 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2695 in6_dev = in6_dev_get(dev);
2698 net_dbg_ratelimited("addrconf: device %s not configured\n",
2704 * Two things going on here:
2705 * 1) Add routes for on-link prefixes
2706 * 2) Configure prefixes with the auto flag set
2709 if (pinfo->onlink) {
2710 struct fib6_info *rt;
2711 unsigned long rt_expires;
2713 /* Avoid arithmetic overflow. Really, we could
2714 * save rt_expires in seconds, likely valid_lft,
2715 * but it would require division in fib gc, that it
2719 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2721 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2723 if (addrconf_finite_timeout(rt_expires))
2726 rt = addrconf_get_prefix_route(&pinfo->prefix,
2729 RTF_ADDRCONF | RTF_PREFIX_RT,
2733 /* Autoconf prefix route */
2734 if (valid_lft == 0) {
2735 ip6_del_rt(net, rt, false);
2737 } else if (addrconf_finite_timeout(rt_expires)) {
2739 fib6_set_expires(rt, jiffies + rt_expires);
2741 fib6_clean_expires(rt);
2743 } else if (valid_lft) {
2744 clock_t expires = 0;
2745 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2746 if (addrconf_finite_timeout(rt_expires)) {
2748 flags |= RTF_EXPIRES;
2749 expires = jiffies_to_clock_t(rt_expires);
2751 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2752 0, dev, expires, flags,
2755 fib6_info_release(rt);
2758 /* Try to figure out our local address for this prefix */
2760 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2761 struct in6_addr addr;
2762 bool tokenized = false, dev_addr_generated = false;
2764 if (pinfo->prefix_len == 64) {
2765 memcpy(&addr, &pinfo->prefix, 8);
2767 if (!ipv6_addr_any(&in6_dev->token)) {
2768 read_lock_bh(&in6_dev->lock);
2769 memcpy(addr.s6_addr + 8,
2770 in6_dev->token.s6_addr + 8, 8);
2771 read_unlock_bh(&in6_dev->lock);
2773 } else if (is_addr_mode_generate_stable(in6_dev) &&
2774 !ipv6_generate_stable_address(&addr, 0,
2776 addr_flags |= IFA_F_STABLE_PRIVACY;
2778 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2779 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2782 dev_addr_generated = true;
2786 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2791 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2794 tokenized, valid_lft,
2799 /* Ignore error case here because previous prefix add addr was
2800 * successful which will be notified.
2802 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2803 addr_type, addr_flags, sllao,
2804 tokenized, valid_lft,
2806 dev_addr_generated);
2808 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2810 in6_dev_put(in6_dev);
2813 static int addrconf_set_sit_dstaddr(struct net *net, struct net_device *dev,
2814 struct in6_ifreq *ireq)
2816 struct ip_tunnel_parm p = { };
2819 if (!(ipv6_addr_type(&ireq->ifr6_addr) & IPV6_ADDR_COMPATv4))
2820 return -EADDRNOTAVAIL;
2822 p.iph.daddr = ireq->ifr6_addr.s6_addr32[3];
2825 p.iph.protocol = IPPROTO_IPV6;
2828 if (!dev->netdev_ops->ndo_tunnel_ctl)
2830 err = dev->netdev_ops->ndo_tunnel_ctl(dev, &p, SIOCADDTUNNEL);
2834 dev = __dev_get_by_name(net, p.name);
2837 return dev_open(dev, NULL);
2841 * Set destination address.
2842 * Special case for SIT interfaces where we create a new "virtual"
2845 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2847 struct net_device *dev;
2848 struct in6_ifreq ireq;
2851 if (!IS_ENABLED(CONFIG_IPV6_SIT))
2853 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2857 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2858 if (dev && dev->type == ARPHRD_SIT)
2859 err = addrconf_set_sit_dstaddr(net, dev, &ireq);
2864 static int ipv6_mc_config(struct sock *sk, bool join,
2865 const struct in6_addr *addr, int ifindex)
2873 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2875 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2882 * Manual configuration of address on an interface
2884 static int inet6_addr_add(struct net *net, int ifindex,
2885 struct ifa6_config *cfg,
2886 struct netlink_ext_ack *extack)
2888 struct inet6_ifaddr *ifp;
2889 struct inet6_dev *idev;
2890 struct net_device *dev;
2891 unsigned long timeout;
2897 if (cfg->plen > 128)
2900 /* check the lifetime */
2901 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
2904 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64)
2907 dev = __dev_get_by_index(net, ifindex);
2911 idev = addrconf_add_dev(dev);
2913 return PTR_ERR(idev);
2915 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
2916 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2917 true, cfg->pfx, ifindex);
2923 cfg->scope = ipv6_addr_scope(cfg->pfx);
2925 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
2926 if (addrconf_finite_timeout(timeout)) {
2927 expires = jiffies_to_clock_t(timeout * HZ);
2928 cfg->valid_lft = timeout;
2929 flags = RTF_EXPIRES;
2933 cfg->ifa_flags |= IFA_F_PERMANENT;
2936 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
2937 if (addrconf_finite_timeout(timeout)) {
2939 cfg->ifa_flags |= IFA_F_DEPRECATED;
2940 cfg->preferred_lft = timeout;
2943 ifp = ipv6_add_addr(idev, cfg, true, extack);
2945 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
2946 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
2947 ifp->rt_priority, dev, expires,
2951 /* Send a netlink notification if DAD is enabled and
2952 * optimistic flag is not set
2954 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD)))
2955 ipv6_ifa_notify(0, ifp);
2957 * Note that section 3.1 of RFC 4429 indicates
2958 * that the Optimistic flag should not be set for
2959 * manually configured addresses
2961 addrconf_dad_start(ifp);
2962 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR)
2963 manage_tempaddrs(idev, ifp, cfg->valid_lft,
2964 cfg->preferred_lft, true, jiffies);
2966 addrconf_verify_rtnl();
2968 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
2969 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false,
2973 return PTR_ERR(ifp);
2976 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2977 const struct in6_addr *pfx, unsigned int plen)
2979 struct inet6_ifaddr *ifp;
2980 struct inet6_dev *idev;
2981 struct net_device *dev;
2986 dev = __dev_get_by_index(net, ifindex);
2990 idev = __in6_dev_get(dev);
2994 read_lock_bh(&idev->lock);
2995 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2996 if (ifp->prefix_len == plen &&
2997 ipv6_addr_equal(pfx, &ifp->addr)) {
2999 read_unlock_bh(&idev->lock);
3001 if (!(ifp->flags & IFA_F_TEMPORARY) &&
3002 (ifa_flags & IFA_F_MANAGETEMPADDR))
3003 manage_tempaddrs(idev, ifp, 0, 0, false,
3006 addrconf_verify_rtnl();
3007 if (ipv6_addr_is_multicast(pfx)) {
3008 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
3009 false, pfx, dev->ifindex);
3014 read_unlock_bh(&idev->lock);
3015 return -EADDRNOTAVAIL;
3019 int addrconf_add_ifaddr(struct net *net, void __user *arg)
3021 struct ifa6_config cfg = {
3022 .ifa_flags = IFA_F_PERMANENT,
3023 .preferred_lft = INFINITY_LIFE_TIME,
3024 .valid_lft = INFINITY_LIFE_TIME,
3026 struct in6_ifreq ireq;
3029 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3032 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3035 cfg.pfx = &ireq.ifr6_addr;
3036 cfg.plen = ireq.ifr6_prefixlen;
3039 err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL);
3044 int addrconf_del_ifaddr(struct net *net, void __user *arg)
3046 struct in6_ifreq ireq;
3049 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3052 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3056 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
3057 ireq.ifr6_prefixlen);
3062 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
3063 int plen, int scope)
3065 struct inet6_ifaddr *ifp;
3066 struct ifa6_config cfg = {
3069 .ifa_flags = IFA_F_PERMANENT,
3070 .valid_lft = INFINITY_LIFE_TIME,
3071 .preferred_lft = INFINITY_LIFE_TIME,
3075 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
3077 spin_lock_bh(&ifp->lock);
3078 ifp->flags &= ~IFA_F_TENTATIVE;
3079 spin_unlock_bh(&ifp->lock);
3080 rt_genid_bump_ipv6(dev_net(idev->dev));
3081 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3086 #if IS_ENABLED(CONFIG_IPV6_SIT)
3087 static void sit_add_v4_addrs(struct inet6_dev *idev)
3089 struct in6_addr addr;
3090 struct net_device *dev;
3091 struct net *net = dev_net(idev->dev);
3097 memset(&addr, 0, sizeof(struct in6_addr));
3098 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
3100 if (idev->dev->flags&IFF_POINTOPOINT) {
3101 addr.s6_addr32[0] = htonl(0xfe800000);
3105 scope = IPV6_ADDR_COMPATv4;
3107 pflags |= RTF_NONEXTHOP;
3110 if (addr.s6_addr32[3]) {
3111 add_addr(idev, &addr, plen, scope);
3112 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags,
3117 for_each_netdev(net, dev) {
3118 struct in_device *in_dev = __in_dev_get_rtnl(dev);
3119 if (in_dev && (dev->flags & IFF_UP)) {
3120 struct in_ifaddr *ifa;
3123 in_dev_for_each_ifa_rtnl(ifa, in_dev) {
3124 addr.s6_addr32[3] = ifa->ifa_local;
3126 if (ifa->ifa_scope == RT_SCOPE_LINK)
3128 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
3129 if (idev->dev->flags&IFF_POINTOPOINT)
3134 add_addr(idev, &addr, plen, flag);
3135 addrconf_prefix_route(&addr, plen, 0, idev->dev,
3136 0, pflags, GFP_KERNEL);
3143 static void init_loopback(struct net_device *dev)
3145 struct inet6_dev *idev;
3151 idev = ipv6_find_idev(dev);
3153 pr_debug("%s: add_dev failed\n", __func__);
3157 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
3160 void addrconf_add_linklocal(struct inet6_dev *idev,
3161 const struct in6_addr *addr, u32 flags)
3163 struct ifa6_config cfg = {
3166 .ifa_flags = flags | IFA_F_PERMANENT,
3167 .valid_lft = INFINITY_LIFE_TIME,
3168 .preferred_lft = INFINITY_LIFE_TIME,
3171 struct inet6_ifaddr *ifp;
3173 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3174 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad ||
3175 idev->cnf.optimistic_dad) &&
3176 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
3177 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
3180 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
3182 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev,
3184 addrconf_dad_start(ifp);
3188 EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
3190 static bool ipv6_reserved_interfaceid(struct in6_addr address)
3192 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3195 if (address.s6_addr32[2] == htonl(0x02005eff) &&
3196 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3199 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3200 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3206 static int ipv6_generate_stable_address(struct in6_addr *address,
3208 const struct inet6_dev *idev)
3210 static DEFINE_SPINLOCK(lock);
3211 static __u32 digest[SHA1_DIGEST_WORDS];
3212 static __u32 workspace[SHA1_WORKSPACE_WORDS];
3215 char __data[SHA1_BLOCK_SIZE];
3217 struct in6_addr secret;
3219 unsigned char hwaddr[MAX_ADDR_LEN];
3224 struct in6_addr secret;
3225 struct in6_addr temp;
3226 struct net *net = dev_net(idev->dev);
3228 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3230 if (idev->cnf.stable_secret.initialized)
3231 secret = idev->cnf.stable_secret.secret;
3232 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3233 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3238 spin_lock_bh(&lock);
3241 memset(&data, 0, sizeof(data));
3242 memset(workspace, 0, sizeof(workspace));
3243 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3244 data.prefix[0] = address->s6_addr32[0];
3245 data.prefix[1] = address->s6_addr32[1];
3246 data.secret = secret;
3247 data.dad_count = dad_count;
3249 sha1_transform(digest, data.__data, workspace);
3252 temp.s6_addr32[2] = (__force __be32)digest[0];
3253 temp.s6_addr32[3] = (__force __be32)digest[1];
3255 spin_unlock_bh(&lock);
3257 if (ipv6_reserved_interfaceid(temp)) {
3259 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3268 static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3270 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3274 s = &idev->cnf.stable_secret;
3275 get_random_bytes(&s->secret, sizeof(s->secret));
3276 s->initialized = true;
3279 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3281 struct in6_addr addr;
3283 /* no link local addresses on L3 master devices */
3284 if (netif_is_l3_master(idev->dev))
3287 /* no link local addresses on devices flagged as slaves */
3288 if (idev->dev->flags & IFF_SLAVE)
3291 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3293 switch (idev->cnf.addr_gen_mode) {
3294 case IN6_ADDR_GEN_MODE_RANDOM:
3295 ipv6_gen_mode_random_init(idev);
3297 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
3298 if (!ipv6_generate_stable_address(&addr, 0, idev))
3299 addrconf_add_linklocal(idev, &addr,
3300 IFA_F_STABLE_PRIVACY);
3301 else if (prefix_route)
3302 addrconf_prefix_route(&addr, 64, 0, idev->dev,
3305 case IN6_ADDR_GEN_MODE_EUI64:
3306 /* addrconf_add_linklocal also adds a prefix_route and we
3307 * only need to care about prefix routes if ipv6_generate_eui64
3308 * couldn't generate one.
3310 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3311 addrconf_add_linklocal(idev, &addr, 0);
3312 else if (prefix_route)
3313 addrconf_prefix_route(&addr, 64, 0, idev->dev,
3316 case IN6_ADDR_GEN_MODE_NONE:
3318 /* will not add any link local address */
3323 static void addrconf_dev_config(struct net_device *dev)
3325 struct inet6_dev *idev;
3329 if ((dev->type != ARPHRD_ETHER) &&
3330 (dev->type != ARPHRD_FDDI) &&
3331 (dev->type != ARPHRD_ARCNET) &&
3332 (dev->type != ARPHRD_INFINIBAND) &&
3333 (dev->type != ARPHRD_IEEE1394) &&
3334 (dev->type != ARPHRD_TUNNEL6) &&
3335 (dev->type != ARPHRD_6LOWPAN) &&
3336 (dev->type != ARPHRD_IP6GRE) &&
3337 (dev->type != ARPHRD_IPGRE) &&
3338 (dev->type != ARPHRD_TUNNEL) &&
3339 (dev->type != ARPHRD_NONE) &&
3340 (dev->type != ARPHRD_RAWIP)) {
3341 /* Alas, we support only Ethernet autoconfiguration. */
3342 idev = __in6_dev_get(dev);
3343 if (!IS_ERR_OR_NULL(idev) && dev->flags & IFF_UP &&
3344 dev->flags & IFF_MULTICAST)
3349 idev = addrconf_add_dev(dev);
3353 /* this device type has no EUI support */
3354 if (dev->type == ARPHRD_NONE &&
3355 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3356 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
3358 addrconf_addr_gen(idev, false);
3361 #if IS_ENABLED(CONFIG_IPV6_SIT)
3362 static void addrconf_sit_config(struct net_device *dev)
3364 struct inet6_dev *idev;
3369 * Configure the tunnel with one of our IPv4
3370 * addresses... we should configure all of
3371 * our v4 addrs in the tunnel
3374 idev = ipv6_find_idev(dev);
3376 pr_debug("%s: add_dev failed\n", __func__);
3380 if (dev->priv_flags & IFF_ISATAP) {
3381 addrconf_addr_gen(idev, false);
3385 sit_add_v4_addrs(idev);
3387 if (dev->flags&IFF_POINTOPOINT)
3388 addrconf_add_mroute(dev);
3392 #if IS_ENABLED(CONFIG_NET_IPGRE)
3393 static void addrconf_gre_config(struct net_device *dev)
3395 struct inet6_dev *idev;
3399 idev = ipv6_find_idev(dev);
3401 pr_debug("%s: add_dev failed\n", __func__);
3405 addrconf_addr_gen(idev, true);
3406 if (dev->flags & IFF_POINTOPOINT)
3407 addrconf_add_mroute(dev);
3411 static int fixup_permanent_addr(struct net *net,
3412 struct inet6_dev *idev,
3413 struct inet6_ifaddr *ifp)
3415 /* !fib6_node means the host route was removed from the
3416 * FIB, for example, if 'lo' device is taken down. In that
3417 * case regenerate the host route.
3419 if (!ifp->rt || !ifp->rt->fib6_node) {
3420 struct fib6_info *f6i, *prev;
3422 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false,
3425 return PTR_ERR(f6i);
3427 /* ifp->rt can be accessed outside of rtnl */
3428 spin_lock(&ifp->lock);
3431 spin_unlock(&ifp->lock);
3433 fib6_info_release(prev);
3436 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3437 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3438 ifp->rt_priority, idev->dev, 0, 0,
3442 if (ifp->state == INET6_IFADDR_STATE_PREDAD)
3443 addrconf_dad_start(ifp);
3448 static void addrconf_permanent_addr(struct net *net, struct net_device *dev)
3450 struct inet6_ifaddr *ifp, *tmp;
3451 struct inet6_dev *idev;
3453 idev = __in6_dev_get(dev);
3457 write_lock_bh(&idev->lock);
3459 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3460 if ((ifp->flags & IFA_F_PERMANENT) &&
3461 fixup_permanent_addr(net, idev, ifp) < 0) {
3462 write_unlock_bh(&idev->lock);
3465 write_lock_bh(&idev->lock);
3467 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3468 idev->dev->name, &ifp->addr);
3472 write_unlock_bh(&idev->lock);
3475 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3478 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3479 struct netdev_notifier_change_info *change_info;
3480 struct netdev_notifier_changeupper_info *info;
3481 struct inet6_dev *idev = __in6_dev_get(dev);
3482 struct net *net = dev_net(dev);
3483 int run_pending = 0;
3487 case NETDEV_REGISTER:
3488 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3489 idev = ipv6_add_dev(dev);
3491 return notifier_from_errno(PTR_ERR(idev));
3495 case NETDEV_CHANGEMTU:
3496 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3497 if (dev->mtu < IPV6_MIN_MTU) {
3498 addrconf_ifdown(dev, dev != net->loopback_dev);
3503 rt6_mtu_change(dev, dev->mtu);
3504 idev->cnf.mtu6 = dev->mtu;
3508 /* allocate new idev */
3509 idev = ipv6_add_dev(dev);
3513 /* device is still not ready */
3514 if (!(idev->if_flags & IF_READY))
3521 if (dev->flags & IFF_SLAVE)
3524 if (idev && idev->cnf.disable_ipv6)
3527 if (event == NETDEV_UP) {
3528 /* restore routes for permanent addresses */
3529 addrconf_permanent_addr(net, dev);
3531 if (!addrconf_link_ready(dev)) {
3532 /* device is not ready yet. */
3533 pr_debug("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3538 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3539 idev = ipv6_add_dev(dev);
3541 if (!IS_ERR_OR_NULL(idev)) {
3542 idev->if_flags |= IF_READY;
3545 } else if (event == NETDEV_CHANGE) {
3546 if (!addrconf_link_ready(dev)) {
3547 /* device is still not ready. */
3548 rt6_sync_down_dev(dev, event);
3552 if (!IS_ERR_OR_NULL(idev)) {
3553 if (idev->if_flags & IF_READY) {
3554 /* device is already configured -
3555 * but resend MLD reports, we might
3556 * have roamed and need to update
3557 * multicast snooping switches
3561 if (change_info->flags_changed & IFF_NOARP)
3562 addrconf_dad_run(idev, true);
3563 rt6_sync_up(dev, RTNH_F_LINKDOWN);
3566 idev->if_flags |= IF_READY;
3569 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3575 switch (dev->type) {
3576 #if IS_ENABLED(CONFIG_IPV6_SIT)
3578 addrconf_sit_config(dev);
3581 #if IS_ENABLED(CONFIG_NET_IPGRE)
3583 addrconf_gre_config(dev);
3586 case ARPHRD_LOOPBACK:
3591 addrconf_dev_config(dev);
3595 if (!IS_ERR_OR_NULL(idev)) {
3597 addrconf_dad_run(idev, false);
3599 /* Device has an address by now */
3600 rt6_sync_up(dev, RTNH_F_DEAD);
3603 * If the MTU changed during the interface down,
3604 * when the interface up, the changed MTU must be
3605 * reflected in the idev as well as routers.
3607 if (idev->cnf.mtu6 != dev->mtu &&
3608 dev->mtu >= IPV6_MIN_MTU) {
3609 rt6_mtu_change(dev, dev->mtu);
3610 idev->cnf.mtu6 = dev->mtu;
3612 idev->tstamp = jiffies;
3613 inet6_ifinfo_notify(RTM_NEWLINK, idev);
3616 * If the changed mtu during down is lower than
3617 * IPV6_MIN_MTU stop IPv6 on this interface.
3619 if (dev->mtu < IPV6_MIN_MTU)
3620 addrconf_ifdown(dev, dev != net->loopback_dev);
3625 case NETDEV_UNREGISTER:
3627 * Remove all addresses from this interface.
3629 addrconf_ifdown(dev, event != NETDEV_DOWN);
3632 case NETDEV_CHANGENAME:
3634 snmp6_unregister_dev(idev);
3635 addrconf_sysctl_unregister(idev);
3636 err = addrconf_sysctl_register(idev);
3638 return notifier_from_errno(err);
3639 err = snmp6_register_dev(idev);
3641 addrconf_sysctl_unregister(idev);
3642 return notifier_from_errno(err);
3647 case NETDEV_PRE_TYPE_CHANGE:
3648 case NETDEV_POST_TYPE_CHANGE:
3650 addrconf_type_change(dev, event);
3653 case NETDEV_CHANGEUPPER:
3656 /* flush all routes if dev is linked to or unlinked from
3657 * an L3 master device (e.g., VRF)
3659 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3660 addrconf_ifdown(dev, false);
3667 * addrconf module should be notified of a device going up
3669 static struct notifier_block ipv6_dev_notf = {
3670 .notifier_call = addrconf_notify,
3671 .priority = ADDRCONF_NOTIFY_PRIORITY,
3674 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3676 struct inet6_dev *idev;
3679 idev = __in6_dev_get(dev);
3681 if (event == NETDEV_POST_TYPE_CHANGE)
3682 ipv6_mc_remap(idev);
3683 else if (event == NETDEV_PRE_TYPE_CHANGE)
3684 ipv6_mc_unmap(idev);
3687 static bool addr_is_local(const struct in6_addr *addr)
3689 return ipv6_addr_type(addr) &
3690 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3693 static int addrconf_ifdown(struct net_device *dev, bool unregister)
3695 unsigned long event = unregister ? NETDEV_UNREGISTER : NETDEV_DOWN;
3696 struct net *net = dev_net(dev);
3697 struct inet6_dev *idev;
3698 struct inet6_ifaddr *ifa, *tmp;
3699 bool keep_addr = false;
3704 rt6_disable_ip(dev, event);
3706 idev = __in6_dev_get(dev);
3711 * Step 1: remove reference to ipv6 device from parent device.
3717 /* protected by rtnl_lock */
3718 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3720 /* Step 1.5: remove snmp6 entry */
3721 snmp6_unregister_dev(idev);
3725 /* combine the user config with event to determine if permanent
3726 * addresses are to be removed from address hash table
3728 if (!unregister && !idev->cnf.disable_ipv6) {
3729 /* aggregate the system setting and interface setting */
3730 int _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3733 _keep_addr = idev->cnf.keep_addr_on_down;
3735 keep_addr = (_keep_addr > 0);
3738 /* Step 2: clear hash table */
3739 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3740 struct hlist_head *h = &inet6_addr_lst[i];
3742 spin_lock_bh(&addrconf_hash_lock);
3744 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3745 if (ifa->idev == idev) {
3746 addrconf_del_dad_work(ifa);
3747 /* combined flag + permanent flag decide if
3748 * address is retained on a down event
3751 !(ifa->flags & IFA_F_PERMANENT) ||
3752 addr_is_local(&ifa->addr)) {
3753 hlist_del_init_rcu(&ifa->addr_lst);
3758 spin_unlock_bh(&addrconf_hash_lock);
3761 write_lock_bh(&idev->lock);
3763 addrconf_del_rs_timer(idev);
3765 /* Step 2: clear flags for stateless addrconf */
3767 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3769 /* Step 3: clear tempaddr list */
3770 while (!list_empty(&idev->tempaddr_list)) {
3771 ifa = list_first_entry(&idev->tempaddr_list,
3772 struct inet6_ifaddr, tmp_list);
3773 list_del(&ifa->tmp_list);
3774 write_unlock_bh(&idev->lock);
3775 spin_lock_bh(&ifa->lock);
3778 in6_ifa_put(ifa->ifpub);
3781 spin_unlock_bh(&ifa->lock);
3783 write_lock_bh(&idev->lock);
3786 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
3787 struct fib6_info *rt = NULL;
3790 addrconf_del_dad_work(ifa);
3792 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3793 !addr_is_local(&ifa->addr);
3795 write_unlock_bh(&idev->lock);
3796 spin_lock_bh(&ifa->lock);
3799 /* set state to skip the notifier below */
3800 state = INET6_IFADDR_STATE_DEAD;
3801 ifa->state = INET6_IFADDR_STATE_PREDAD;
3802 if (!(ifa->flags & IFA_F_NODAD))
3803 ifa->flags |= IFA_F_TENTATIVE;
3809 ifa->state = INET6_IFADDR_STATE_DEAD;
3812 spin_unlock_bh(&ifa->lock);
3815 ip6_del_rt(net, rt, false);
3817 if (state != INET6_IFADDR_STATE_DEAD) {
3818 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3819 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3821 if (idev->cnf.forwarding)
3822 addrconf_leave_anycast(ifa);
3823 addrconf_leave_solict(ifa->idev, &ifa->addr);
3826 write_lock_bh(&idev->lock);
3828 list_del_rcu(&ifa->if_list);
3833 write_unlock_bh(&idev->lock);
3835 /* Step 5: Discard anycast and multicast list */
3837 ipv6_ac_destroy_dev(idev);
3838 ipv6_mc_destroy_dev(idev);
3843 idev->tstamp = jiffies;
3845 /* Last: Shot the device (if unregistered) */
3847 addrconf_sysctl_unregister(idev);
3848 neigh_parms_release(&nd_tbl, idev->nd_parms);
3849 neigh_ifdown(&nd_tbl, dev);
3855 static void addrconf_rs_timer(struct timer_list *t)
3857 struct inet6_dev *idev = from_timer(idev, t, rs_timer);
3858 struct net_device *dev = idev->dev;
3859 struct in6_addr lladdr;
3861 write_lock(&idev->lock);
3862 if (idev->dead || !(idev->if_flags & IF_READY))
3865 if (!ipv6_accept_ra(idev))
3868 /* Announcement received after solicitation was sent */
3869 if (idev->if_flags & IF_RA_RCVD)
3872 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
3873 write_unlock(&idev->lock);
3874 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3875 ndisc_send_rs(dev, &lladdr,
3876 &in6addr_linklocal_allrouters);
3880 write_lock(&idev->lock);
3881 idev->rs_interval = rfc3315_s14_backoff_update(
3882 idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
3883 /* The wait after the last probe can be shorter */
3884 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3885 idev->cnf.rtr_solicits) ?
3886 idev->cnf.rtr_solicit_delay :
3890 * Note: we do not support deprecated "all on-link"
3891 * assumption any longer.
3893 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3897 write_unlock(&idev->lock);
3903 * Duplicate Address Detection
3905 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3907 unsigned long rand_num;
3908 struct inet6_dev *idev = ifp->idev;
3911 if (ifp->flags & IFA_F_OPTIMISTIC)
3914 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3917 if (idev->cnf.enhanced_dad ||
3918 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) {
3920 get_random_bytes(&nonce, 6);
3923 ifp->dad_nonce = nonce;
3924 ifp->dad_probes = idev->cnf.dad_transmits;
3925 addrconf_mod_dad_work(ifp, rand_num);
3928 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3930 struct inet6_dev *idev = ifp->idev;
3931 struct net_device *dev = idev->dev;
3932 bool bump_id, notify = false;
3935 addrconf_join_solict(dev, &ifp->addr);
3937 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3939 read_lock_bh(&idev->lock);
3940 spin_lock(&ifp->lock);
3941 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3945 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3946 (net->ipv6.devconf_all->accept_dad < 1 &&
3947 idev->cnf.accept_dad < 1) ||
3948 !(ifp->flags&IFA_F_TENTATIVE) ||
3949 ifp->flags & IFA_F_NODAD) {
3950 bool send_na = false;
3952 if (ifp->flags & IFA_F_TENTATIVE &&
3953 !(ifp->flags & IFA_F_OPTIMISTIC))
3955 bump_id = ifp->flags & IFA_F_TENTATIVE;
3956 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3957 spin_unlock(&ifp->lock);
3958 read_unlock_bh(&idev->lock);
3960 addrconf_dad_completed(ifp, bump_id, send_na);
3964 if (!(idev->if_flags & IF_READY)) {
3965 spin_unlock(&ifp->lock);
3966 read_unlock_bh(&idev->lock);
3968 * If the device is not ready:
3969 * - keep it tentative if it is a permanent address.
3970 * - otherwise, kill it.
3973 addrconf_dad_stop(ifp, 0);
3978 * Optimistic nodes can start receiving
3981 if (ifp->flags & IFA_F_OPTIMISTIC) {
3982 ip6_ins_rt(net, ifp->rt);
3983 if (ipv6_use_optimistic_addr(net, idev)) {
3984 /* Because optimistic nodes can use this address,
3985 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3991 addrconf_dad_kick(ifp);
3993 spin_unlock(&ifp->lock);
3994 read_unlock_bh(&idev->lock);
3996 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3999 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
4001 bool begin_dad = false;
4003 spin_lock_bh(&ifp->lock);
4004 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
4005 ifp->state = INET6_IFADDR_STATE_PREDAD;
4008 spin_unlock_bh(&ifp->lock);
4011 addrconf_mod_dad_work(ifp, 0);
4014 static void addrconf_dad_work(struct work_struct *w)
4016 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
4017 struct inet6_ifaddr,
4019 struct inet6_dev *idev = ifp->idev;
4020 bool bump_id, disable_ipv6 = false;
4021 struct in6_addr mcaddr;
4027 } action = DAD_PROCESS;
4031 spin_lock_bh(&ifp->lock);
4032 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
4034 ifp->state = INET6_IFADDR_STATE_DAD;
4035 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
4037 ifp->state = INET6_IFADDR_STATE_POSTDAD;
4039 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 ||
4040 idev->cnf.accept_dad > 1) &&
4041 !idev->cnf.disable_ipv6 &&
4042 !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
4043 struct in6_addr addr;
4045 addr.s6_addr32[0] = htonl(0xfe800000);
4046 addr.s6_addr32[1] = 0;
4048 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
4049 ipv6_addr_equal(&ifp->addr, &addr)) {
4050 /* DAD failed for link-local based on MAC */
4051 idev->cnf.disable_ipv6 = 1;
4053 pr_info("%s: IPv6 being disabled!\n",
4054 ifp->idev->dev->name);
4055 disable_ipv6 = true;
4059 spin_unlock_bh(&ifp->lock);
4061 if (action == DAD_BEGIN) {
4062 addrconf_dad_begin(ifp);
4064 } else if (action == DAD_ABORT) {
4066 addrconf_dad_stop(ifp, 1);
4068 addrconf_ifdown(idev->dev, false);
4072 if (!ifp->dad_probes && addrconf_dad_end(ifp))
4075 write_lock_bh(&idev->lock);
4076 if (idev->dead || !(idev->if_flags & IF_READY)) {
4077 write_unlock_bh(&idev->lock);
4081 spin_lock(&ifp->lock);
4082 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
4083 spin_unlock(&ifp->lock);
4084 write_unlock_bh(&idev->lock);
4088 if (ifp->dad_probes == 0) {
4089 bool send_na = false;
4092 * DAD was successful
4095 if (ifp->flags & IFA_F_TENTATIVE &&
4096 !(ifp->flags & IFA_F_OPTIMISTIC))
4098 bump_id = ifp->flags & IFA_F_TENTATIVE;
4099 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
4100 spin_unlock(&ifp->lock);
4101 write_unlock_bh(&idev->lock);
4103 addrconf_dad_completed(ifp, bump_id, send_na);
4109 addrconf_mod_dad_work(ifp,
4110 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME),
4112 spin_unlock(&ifp->lock);
4113 write_unlock_bh(&idev->lock);
4115 /* send a neighbour solicitation for our addr */
4116 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
4117 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
4124 /* ifp->idev must be at least read locked */
4125 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
4127 struct inet6_ifaddr *ifpiter;
4128 struct inet6_dev *idev = ifp->idev;
4130 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
4131 if (ifpiter->scope > IFA_LINK)
4133 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
4134 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
4135 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
4142 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
4145 struct net_device *dev = ifp->idev->dev;
4146 struct in6_addr lladdr;
4147 bool send_rs, send_mld;
4149 addrconf_del_dad_work(ifp);
4152 * Configure the address for reception. Now it is valid.
4155 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4157 /* If added prefix is link local and we are prepared to process
4158 router advertisements, start sending router solicitations.
4161 read_lock_bh(&ifp->idev->lock);
4162 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
4163 send_rs = send_mld &&
4164 ipv6_accept_ra(ifp->idev) &&
4165 ifp->idev->cnf.rtr_solicits != 0 &&
4166 (dev->flags&IFF_LOOPBACK) == 0;
4167 read_unlock_bh(&ifp->idev->lock);
4169 /* While dad is in progress mld report's source address is in6_addrany.
4170 * Resend with proper ll now.
4173 ipv6_mc_dad_complete(ifp->idev);
4175 /* send unsolicited NA if enabled */
4177 (ifp->idev->cnf.ndisc_notify ||
4178 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) {
4179 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr,
4180 /*router=*/ !!ifp->idev->cnf.forwarding,
4181 /*solicited=*/ false, /*override=*/ true,
4187 * If a host as already performed a random delay
4188 * [...] as part of DAD [...] there is no need
4189 * to delay again before sending the first RS
4191 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
4193 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
4195 write_lock_bh(&ifp->idev->lock);
4196 spin_lock(&ifp->lock);
4197 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4198 ifp->idev->cnf.rtr_solicit_interval);
4199 ifp->idev->rs_probes = 1;
4200 ifp->idev->if_flags |= IF_RS_SENT;
4201 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
4202 spin_unlock(&ifp->lock);
4203 write_unlock_bh(&ifp->idev->lock);
4207 rt_genid_bump_ipv6(dev_net(dev));
4209 /* Make sure that a new temporary address will be created
4210 * before this temporary address becomes deprecated.
4212 if (ifp->flags & IFA_F_TEMPORARY)
4213 addrconf_verify_rtnl();
4216 static void addrconf_dad_run(struct inet6_dev *idev, bool restart)
4218 struct inet6_ifaddr *ifp;
4220 read_lock_bh(&idev->lock);
4221 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4222 spin_lock(&ifp->lock);
4223 if ((ifp->flags & IFA_F_TENTATIVE &&
4224 ifp->state == INET6_IFADDR_STATE_DAD) || restart) {
4226 ifp->state = INET6_IFADDR_STATE_PREDAD;
4227 addrconf_dad_kick(ifp);
4229 spin_unlock(&ifp->lock);
4231 read_unlock_bh(&idev->lock);
4234 #ifdef CONFIG_PROC_FS
4235 struct if6_iter_state {
4236 struct seq_net_private p;
4241 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
4243 struct if6_iter_state *state = seq->private;
4244 struct net *net = seq_file_net(seq);
4245 struct inet6_ifaddr *ifa = NULL;
4248 /* initial bucket if pos is 0 */
4254 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
4255 hlist_for_each_entry_rcu(ifa, &inet6_addr_lst[state->bucket],
4257 if (!net_eq(dev_net(ifa->idev->dev), net))
4259 /* sync with offset */
4260 if (p < state->offset) {
4267 /* prepare for next bucket */
4274 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4275 struct inet6_ifaddr *ifa)
4277 struct if6_iter_state *state = seq->private;
4278 struct net *net = seq_file_net(seq);
4280 hlist_for_each_entry_continue_rcu(ifa, addr_lst) {
4281 if (!net_eq(dev_net(ifa->idev->dev), net))
4288 while (++state->bucket < IN6_ADDR_HSIZE) {
4289 hlist_for_each_entry_rcu(ifa,
4290 &inet6_addr_lst[state->bucket], addr_lst) {
4291 if (!net_eq(dev_net(ifa->idev->dev), net))
4300 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4304 return if6_get_first(seq, *pos);
4307 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4309 struct inet6_ifaddr *ifa;
4311 ifa = if6_get_next(seq, v);
4316 static void if6_seq_stop(struct seq_file *seq, void *v)
4322 static int if6_seq_show(struct seq_file *seq, void *v)
4324 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4325 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
4327 ifp->idev->dev->ifindex,
4331 ifp->idev->dev->name);
4335 static const struct seq_operations if6_seq_ops = {
4336 .start = if6_seq_start,
4337 .next = if6_seq_next,
4338 .show = if6_seq_show,
4339 .stop = if6_seq_stop,
4342 static int __net_init if6_proc_net_init(struct net *net)
4344 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops,
4345 sizeof(struct if6_iter_state)))
4350 static void __net_exit if6_proc_net_exit(struct net *net)
4352 remove_proc_entry("if_inet6", net->proc_net);
4355 static struct pernet_operations if6_proc_net_ops = {
4356 .init = if6_proc_net_init,
4357 .exit = if6_proc_net_exit,
4360 int __init if6_proc_init(void)
4362 return register_pernet_subsys(&if6_proc_net_ops);
4365 void if6_proc_exit(void)
4367 unregister_pernet_subsys(&if6_proc_net_ops);
4369 #endif /* CONFIG_PROC_FS */
4371 #if IS_ENABLED(CONFIG_IPV6_MIP6)
4372 /* Check if address is a home address configured on any interface. */
4373 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
4375 unsigned int hash = inet6_addr_hash(net, addr);
4376 struct inet6_ifaddr *ifp = NULL;
4380 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
4381 if (!net_eq(dev_net(ifp->idev->dev), net))
4383 if (ipv6_addr_equal(&ifp->addr, addr) &&
4384 (ifp->flags & IFA_F_HOMEADDRESS)) {
4394 /* RFC6554 has some algorithm to avoid loops in segment routing by
4395 * checking if the segments contains any of a local interface address.
4399 * To detect loops in the SRH, a router MUST determine if the SRH
4400 * includes multiple addresses assigned to any interface on that router.
4401 * If such addresses appear more than once and are separated by at least
4402 * one address not assigned to that router.
4404 int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs,
4405 unsigned char nsegs)
4407 const struct in6_addr *addr;
4408 int i, ret = 0, found = 0;
4409 struct inet6_ifaddr *ifp;
4410 bool separated = false;
4415 for (i = 0; i < nsegs; i++) {
4417 hash = inet6_addr_hash(net, addr);
4420 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
4421 if (!net_eq(dev_net(ifp->idev->dev), net))
4424 if (ipv6_addr_equal(&ifp->addr, addr)) {
4431 if (found > 1 && separated) {
4448 * Periodic address status verification
4451 static void addrconf_verify_rtnl(void)
4453 unsigned long now, next, next_sec, next_sched;
4454 struct inet6_ifaddr *ifp;
4461 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
4463 cancel_delayed_work(&addr_chk_work);
4465 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
4467 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
4470 /* When setting preferred_lft to a value not zero or
4471 * infinity, while valid_lft is infinity
4472 * IFA_F_PERMANENT has a non-infinity life time.
4474 if ((ifp->flags & IFA_F_PERMANENT) &&
4475 (ifp->prefered_lft == INFINITY_LIFE_TIME))
4478 spin_lock(&ifp->lock);
4479 /* We try to batch several events at once. */
4480 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
4482 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4483 age >= ifp->valid_lft) {
4484 spin_unlock(&ifp->lock);
4488 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4489 spin_unlock(&ifp->lock);
4491 } else if (age >= ifp->prefered_lft) {
4492 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
4495 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4497 ifp->flags |= IFA_F_DEPRECATED;
4500 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4501 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
4502 next = ifp->tstamp + ifp->valid_lft * HZ;
4504 spin_unlock(&ifp->lock);
4509 ipv6_ifa_notify(0, ifp);
4513 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4514 !(ifp->flags&IFA_F_TENTATIVE)) {
4515 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4516 ifp->idev->cnf.dad_transmits *
4517 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME), HZ/100) / HZ;
4519 if (age >= ifp->prefered_lft - regen_advance) {
4520 struct inet6_ifaddr *ifpub = ifp->ifpub;
4521 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4522 next = ifp->tstamp + ifp->prefered_lft * HZ;
4523 if (!ifp->regen_count && ifpub) {
4526 in6_ifa_hold(ifpub);
4527 spin_unlock(&ifp->lock);
4529 spin_lock(&ifpub->lock);
4530 ifpub->regen_count = 0;
4531 spin_unlock(&ifpub->lock);
4532 rcu_read_unlock_bh();
4533 ipv6_create_tempaddr(ifpub, true);
4539 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4540 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4541 spin_unlock(&ifp->lock);
4543 /* ifp->prefered_lft <= ifp->valid_lft */
4544 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4545 next = ifp->tstamp + ifp->prefered_lft * HZ;
4546 spin_unlock(&ifp->lock);
4551 next_sec = round_jiffies_up(next);
4554 /* If rounded timeout is accurate enough, accept it. */
4555 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4556 next_sched = next_sec;
4558 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4559 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4560 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4562 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4563 now, next, next_sec, next_sched);
4564 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
4565 rcu_read_unlock_bh();
4568 static void addrconf_verify_work(struct work_struct *w)
4571 addrconf_verify_rtnl();
4575 static void addrconf_verify(void)
4577 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4580 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4581 struct in6_addr **peer_pfx)
4583 struct in6_addr *pfx = NULL;
4588 pfx = nla_data(addr);
4591 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4593 pfx = nla_data(local);
4599 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4600 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4601 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4602 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
4603 [IFA_FLAGS] = { .len = sizeof(u32) },
4604 [IFA_RT_PRIORITY] = { .len = sizeof(u32) },
4605 [IFA_TARGET_NETNSID] = { .type = NLA_S32 },
4609 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
4610 struct netlink_ext_ack *extack)
4612 struct net *net = sock_net(skb->sk);
4613 struct ifaddrmsg *ifm;
4614 struct nlattr *tb[IFA_MAX+1];
4615 struct in6_addr *pfx, *peer_pfx;
4619 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4620 ifa_ipv6_policy, extack);
4624 ifm = nlmsg_data(nlh);
4625 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4629 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4631 /* We ignore other flags so far. */
4632 ifa_flags &= IFA_F_MANAGETEMPADDR;
4634 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4635 ifm->ifa_prefixlen);
4638 static int modify_prefix_route(struct inet6_ifaddr *ifp,
4639 unsigned long expires, u32 flags,
4642 struct fib6_info *f6i;
4645 f6i = addrconf_get_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
4647 ifp->idev->dev, 0, RTF_DEFAULT, true);
4651 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF;
4652 if (f6i->fib6_metric != prio) {
4653 /* delete old one */
4654 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false);
4657 addrconf_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
4659 ifp->rt_priority, ifp->idev->dev,
4660 expires, flags, GFP_KERNEL);
4663 fib6_clean_expires(f6i);
4665 fib6_set_expires(f6i, expires);
4667 fib6_info_release(f6i);
4673 static int inet6_addr_modify(struct inet6_ifaddr *ifp, struct ifa6_config *cfg)
4677 unsigned long timeout;
4678 bool was_managetempaddr;
4679 bool had_prefixroute;
4680 bool new_peer = false;
4684 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
4687 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR &&
4688 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4691 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED)
4692 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC;
4694 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
4695 if (addrconf_finite_timeout(timeout)) {
4696 expires = jiffies_to_clock_t(timeout * HZ);
4697 cfg->valid_lft = timeout;
4698 flags = RTF_EXPIRES;
4702 cfg->ifa_flags |= IFA_F_PERMANENT;
4705 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
4706 if (addrconf_finite_timeout(timeout)) {
4708 cfg->ifa_flags |= IFA_F_DEPRECATED;
4709 cfg->preferred_lft = timeout;
4712 if (cfg->peer_pfx &&
4713 memcmp(&ifp->peer_addr, cfg->peer_pfx, sizeof(struct in6_addr))) {
4714 if (!ipv6_addr_any(&ifp->peer_addr))
4715 cleanup_prefix_route(ifp, expires, true, true);
4719 spin_lock_bh(&ifp->lock);
4720 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4721 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4722 !(ifp->flags & IFA_F_NOPREFIXROUTE);
4723 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4724 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4725 IFA_F_NOPREFIXROUTE);
4726 ifp->flags |= cfg->ifa_flags;
4727 ifp->tstamp = jiffies;
4728 ifp->valid_lft = cfg->valid_lft;
4729 ifp->prefered_lft = cfg->preferred_lft;
4731 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority)
4732 ifp->rt_priority = cfg->rt_priority;
4735 ifp->peer_addr = *cfg->peer_pfx;
4737 spin_unlock_bh(&ifp->lock);
4738 if (!(ifp->flags&IFA_F_TENTATIVE))
4739 ipv6_ifa_notify(0, ifp);
4741 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
4744 if (had_prefixroute)
4745 rc = modify_prefix_route(ifp, expires, flags, false);
4747 /* prefix route could have been deleted; if so restore it */
4748 if (rc == -ENOENT) {
4749 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
4750 ifp->rt_priority, ifp->idev->dev,
4751 expires, flags, GFP_KERNEL);
4754 if (had_prefixroute && !ipv6_addr_any(&ifp->peer_addr))
4755 rc = modify_prefix_route(ifp, expires, flags, true);
4757 if (rc == -ENOENT && !ipv6_addr_any(&ifp->peer_addr)) {
4758 addrconf_prefix_route(&ifp->peer_addr, ifp->prefix_len,
4759 ifp->rt_priority, ifp->idev->dev,
4760 expires, flags, GFP_KERNEL);
4762 } else if (had_prefixroute) {
4763 enum cleanup_prefix_rt_t action;
4764 unsigned long rt_expires;
4766 write_lock_bh(&ifp->idev->lock);
4767 action = check_cleanup_prefix_route(ifp, &rt_expires);
4768 write_unlock_bh(&ifp->idev->lock);
4770 if (action != CLEANUP_PREFIX_RT_NOP) {
4771 cleanup_prefix_route(ifp, rt_expires,
4772 action == CLEANUP_PREFIX_RT_DEL, false);
4776 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4777 if (was_managetempaddr &&
4778 !(ifp->flags & IFA_F_MANAGETEMPADDR)) {
4780 cfg->preferred_lft = 0;
4782 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft,
4783 cfg->preferred_lft, !was_managetempaddr,
4787 addrconf_verify_rtnl();
4793 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
4794 struct netlink_ext_ack *extack)
4796 struct net *net = sock_net(skb->sk);
4797 struct ifaddrmsg *ifm;
4798 struct nlattr *tb[IFA_MAX+1];
4799 struct in6_addr *peer_pfx;
4800 struct inet6_ifaddr *ifa;
4801 struct net_device *dev;
4802 struct inet6_dev *idev;
4803 struct ifa6_config cfg;
4806 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4807 ifa_ipv6_policy, extack);
4811 memset(&cfg, 0, sizeof(cfg));
4813 ifm = nlmsg_data(nlh);
4814 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4818 cfg.peer_pfx = peer_pfx;
4819 cfg.plen = ifm->ifa_prefixlen;
4820 if (tb[IFA_RT_PRIORITY])
4821 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]);
4823 cfg.valid_lft = INFINITY_LIFE_TIME;
4824 cfg.preferred_lft = INFINITY_LIFE_TIME;
4826 if (tb[IFA_CACHEINFO]) {
4827 struct ifa_cacheinfo *ci;
4829 ci = nla_data(tb[IFA_CACHEINFO]);
4830 cfg.valid_lft = ci->ifa_valid;
4831 cfg.preferred_lft = ci->ifa_prefered;
4834 dev = __dev_get_by_index(net, ifm->ifa_index);
4839 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]);
4841 cfg.ifa_flags = ifm->ifa_flags;
4843 /* We ignore other flags so far. */
4844 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS |
4845 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE |
4846 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC;
4848 idev = ipv6_find_idev(dev);
4850 return PTR_ERR(idev);
4852 if (!ipv6_allow_optimistic_dad(net, idev))
4853 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC;
4855 if (cfg.ifa_flags & IFA_F_NODAD &&
4856 cfg.ifa_flags & IFA_F_OPTIMISTIC) {
4857 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive");
4861 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1);
4864 * It would be best to check for !NLM_F_CREATE here but
4865 * userspace already relies on not having to provide this.
4867 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack);
4870 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4871 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4874 err = inet6_addr_modify(ifa, &cfg);
4881 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4882 u8 scope, int ifindex)
4884 struct ifaddrmsg *ifm;
4886 ifm = nlmsg_data(nlh);
4887 ifm->ifa_family = AF_INET6;
4888 ifm->ifa_prefixlen = prefixlen;
4889 ifm->ifa_flags = flags;
4890 ifm->ifa_scope = scope;
4891 ifm->ifa_index = ifindex;
4894 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4895 unsigned long tstamp, u32 preferred, u32 valid)
4897 struct ifa_cacheinfo ci;
4899 ci.cstamp = cstamp_delta(cstamp);
4900 ci.tstamp = cstamp_delta(tstamp);
4901 ci.ifa_prefered = preferred;
4902 ci.ifa_valid = valid;
4904 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4907 static inline int rt_scope(int ifa_scope)
4909 if (ifa_scope & IFA_HOST)
4910 return RT_SCOPE_HOST;
4911 else if (ifa_scope & IFA_LINK)
4912 return RT_SCOPE_LINK;
4913 else if (ifa_scope & IFA_SITE)
4914 return RT_SCOPE_SITE;
4916 return RT_SCOPE_UNIVERSE;
4919 static inline int inet6_ifaddr_msgsize(void)
4921 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4922 + nla_total_size(16) /* IFA_LOCAL */
4923 + nla_total_size(16) /* IFA_ADDRESS */
4924 + nla_total_size(sizeof(struct ifa_cacheinfo))
4925 + nla_total_size(4) /* IFA_FLAGS */
4926 + nla_total_size(4) /* IFA_RT_PRIORITY */;
4935 struct inet6_fill_args {
4942 enum addr_type_t type;
4945 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
4946 struct inet6_fill_args *args)
4948 struct nlmsghdr *nlh;
4949 u32 preferred, valid;
4951 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
4952 sizeof(struct ifaddrmsg), args->flags);
4956 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4957 ifa->idev->dev->ifindex);
4959 if (args->netnsid >= 0 &&
4960 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
4963 if (!((ifa->flags&IFA_F_PERMANENT) &&
4964 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
4965 preferred = ifa->prefered_lft;
4966 valid = ifa->valid_lft;
4967 if (preferred != INFINITY_LIFE_TIME) {
4968 long tval = (jiffies - ifa->tstamp)/HZ;
4969 if (preferred > tval)
4973 if (valid != INFINITY_LIFE_TIME) {
4981 preferred = INFINITY_LIFE_TIME;
4982 valid = INFINITY_LIFE_TIME;
4985 if (!ipv6_addr_any(&ifa->peer_addr)) {
4986 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4987 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
4990 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
4993 if (ifa->rt_priority &&
4994 nla_put_u32(skb, IFA_RT_PRIORITY, ifa->rt_priority))
4997 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
5000 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
5003 nlmsg_end(skb, nlh);
5007 nlmsg_cancel(skb, nlh);
5011 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
5012 struct inet6_fill_args *args)
5014 struct nlmsghdr *nlh;
5015 u8 scope = RT_SCOPE_UNIVERSE;
5016 int ifindex = ifmca->idev->dev->ifindex;
5018 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
5019 scope = RT_SCOPE_SITE;
5021 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5022 sizeof(struct ifaddrmsg), args->flags);
5026 if (args->netnsid >= 0 &&
5027 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) {
5028 nlmsg_cancel(skb, nlh);
5032 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
5033 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
5034 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
5035 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
5036 nlmsg_cancel(skb, nlh);
5040 nlmsg_end(skb, nlh);
5044 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
5045 struct inet6_fill_args *args)
5047 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt);
5048 int ifindex = dev ? dev->ifindex : 1;
5049 struct nlmsghdr *nlh;
5050 u8 scope = RT_SCOPE_UNIVERSE;
5052 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
5053 scope = RT_SCOPE_SITE;
5055 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5056 sizeof(struct ifaddrmsg), args->flags);
5060 if (args->netnsid >= 0 &&
5061 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) {
5062 nlmsg_cancel(skb, nlh);
5066 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
5067 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
5068 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
5069 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
5070 nlmsg_cancel(skb, nlh);
5074 nlmsg_end(skb, nlh);
5078 /* called with rcu_read_lock() */
5079 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
5080 struct netlink_callback *cb, int s_ip_idx,
5081 struct inet6_fill_args *fillargs)
5083 struct ifmcaddr6 *ifmca;
5084 struct ifacaddr6 *ifaca;
5088 read_lock_bh(&idev->lock);
5089 switch (fillargs->type) {
5090 case UNICAST_ADDR: {
5091 struct inet6_ifaddr *ifa;
5092 fillargs->event = RTM_NEWADDR;
5094 /* unicast address incl. temp addr */
5095 list_for_each_entry(ifa, &idev->addr_list, if_list) {
5096 if (ip_idx < s_ip_idx)
5098 err = inet6_fill_ifaddr(skb, ifa, fillargs);
5101 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
5107 case MULTICAST_ADDR:
5108 fillargs->event = RTM_GETMULTICAST;
5110 /* multicast address */
5111 for (ifmca = idev->mc_list; ifmca;
5112 ifmca = ifmca->next, ip_idx++) {
5113 if (ip_idx < s_ip_idx)
5115 err = inet6_fill_ifmcaddr(skb, ifmca, fillargs);
5121 fillargs->event = RTM_GETANYCAST;
5122 /* anycast address */
5123 for (ifaca = idev->ac_list; ifaca;
5124 ifaca = ifaca->aca_next, ip_idx++) {
5125 if (ip_idx < s_ip_idx)
5127 err = inet6_fill_ifacaddr(skb, ifaca, fillargs);
5135 read_unlock_bh(&idev->lock);
5136 cb->args[2] = ip_idx;
5140 static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh,
5141 struct inet6_fill_args *fillargs,
5142 struct net **tgt_net, struct sock *sk,
5143 struct netlink_callback *cb)
5145 struct netlink_ext_ack *extack = cb->extack;
5146 struct nlattr *tb[IFA_MAX+1];
5147 struct ifaddrmsg *ifm;
5150 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5151 NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request");
5155 ifm = nlmsg_data(nlh);
5156 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5157 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request");
5161 fillargs->ifindex = ifm->ifa_index;
5162 if (fillargs->ifindex) {
5163 cb->answer_flags |= NLM_F_DUMP_FILTERED;
5164 fillargs->flags |= NLM_F_DUMP_FILTERED;
5167 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5168 ifa_ipv6_policy, extack);
5172 for (i = 0; i <= IFA_MAX; ++i) {
5176 if (i == IFA_TARGET_NETNSID) {
5179 fillargs->netnsid = nla_get_s32(tb[i]);
5180 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid);
5182 fillargs->netnsid = -1;
5183 NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id");
5184 return PTR_ERR(net);
5188 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request");
5196 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
5197 enum addr_type_t type)
5199 const struct nlmsghdr *nlh = cb->nlh;
5200 struct inet6_fill_args fillargs = {
5201 .portid = NETLINK_CB(cb->skb).portid,
5202 .seq = cb->nlh->nlmsg_seq,
5203 .flags = NLM_F_MULTI,
5207 struct net *net = sock_net(skb->sk);
5208 struct net *tgt_net = net;
5209 int idx, s_idx, s_ip_idx;
5211 struct net_device *dev;
5212 struct inet6_dev *idev;
5213 struct hlist_head *head;
5217 s_idx = idx = cb->args[1];
5218 s_ip_idx = cb->args[2];
5220 if (cb->strict_check) {
5221 err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net,
5227 if (fillargs.ifindex) {
5228 dev = __dev_get_by_index(tgt_net, fillargs.ifindex);
5233 idev = __in6_dev_get(dev);
5235 err = in6_dump_addrs(idev, skb, cb, s_ip_idx,
5245 cb->seq = atomic_read(&tgt_net->ipv6.dev_addr_genid) ^ tgt_net->dev_base_seq;
5246 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5248 head = &tgt_net->dev_index_head[h];
5249 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5252 if (h > s_h || idx > s_idx)
5254 idev = __in6_dev_get(dev);
5258 if (in6_dump_addrs(idev, skb, cb, s_ip_idx,
5270 if (fillargs.netnsid >= 0)
5273 return skb->len ? : err;
5276 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
5278 enum addr_type_t type = UNICAST_ADDR;
5280 return inet6_dump_addr(skb, cb, type);
5283 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
5285 enum addr_type_t type = MULTICAST_ADDR;
5287 return inet6_dump_addr(skb, cb, type);
5291 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
5293 enum addr_type_t type = ANYCAST_ADDR;
5295 return inet6_dump_addr(skb, cb, type);
5298 static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb,
5299 const struct nlmsghdr *nlh,
5301 struct netlink_ext_ack *extack)
5303 struct ifaddrmsg *ifm;
5306 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5307 NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request");
5311 if (!netlink_strict_get_check(skb))
5312 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
5313 ifa_ipv6_policy, extack);
5315 ifm = nlmsg_data(nlh);
5316 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5317 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request");
5321 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5322 ifa_ipv6_policy, extack);
5326 for (i = 0; i <= IFA_MAX; i++) {
5331 case IFA_TARGET_NETNSID:
5336 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request");
5344 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
5345 struct netlink_ext_ack *extack)
5347 struct net *net = sock_net(in_skb->sk);
5348 struct inet6_fill_args fillargs = {
5349 .portid = NETLINK_CB(in_skb).portid,
5350 .seq = nlh->nlmsg_seq,
5351 .event = RTM_NEWADDR,
5355 struct net *tgt_net = net;
5356 struct ifaddrmsg *ifm;
5357 struct nlattr *tb[IFA_MAX+1];
5358 struct in6_addr *addr = NULL, *peer;
5359 struct net_device *dev = NULL;
5360 struct inet6_ifaddr *ifa;
5361 struct sk_buff *skb;
5364 err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack);
5368 if (tb[IFA_TARGET_NETNSID]) {
5369 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]);
5371 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk,
5373 if (IS_ERR(tgt_net))
5374 return PTR_ERR(tgt_net);
5377 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
5381 ifm = nlmsg_data(nlh);
5383 dev = dev_get_by_index(tgt_net, ifm->ifa_index);
5385 ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1);
5387 err = -EADDRNOTAVAIL;
5391 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
5397 err = inet6_fill_ifaddr(skb, ifa, &fillargs);
5399 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5400 WARN_ON(err == -EMSGSIZE);
5404 err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid);
5410 if (fillargs.netnsid >= 0)
5416 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
5418 struct sk_buff *skb;
5419 struct net *net = dev_net(ifa->idev->dev);
5420 struct inet6_fill_args fillargs = {
5429 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5433 err = inet6_fill_ifaddr(skb, ifa, &fillargs);
5435 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5436 WARN_ON(err == -EMSGSIZE);
5440 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
5444 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
5447 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
5448 __s32 *array, int bytes)
5450 BUG_ON(bytes < (DEVCONF_MAX * 4));
5452 memset(array, 0, bytes);
5453 array[DEVCONF_FORWARDING] = cnf->forwarding;
5454 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
5455 array[DEVCONF_MTU6] = cnf->mtu6;
5456 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
5457 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
5458 array[DEVCONF_AUTOCONF] = cnf->autoconf;
5459 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
5460 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
5461 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
5462 jiffies_to_msecs(cnf->rtr_solicit_interval);
5463 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
5464 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
5465 array[DEVCONF_RTR_SOLICIT_DELAY] =
5466 jiffies_to_msecs(cnf->rtr_solicit_delay);
5467 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
5468 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
5469 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
5470 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
5471 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
5472 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
5473 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
5474 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
5475 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
5476 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
5477 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
5478 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
5479 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
5480 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
5481 #ifdef CONFIG_IPV6_ROUTER_PREF
5482 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
5483 array[DEVCONF_RTR_PROBE_INTERVAL] =
5484 jiffies_to_msecs(cnf->rtr_probe_interval);
5485 #ifdef CONFIG_IPV6_ROUTE_INFO
5486 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen;
5487 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
5490 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
5491 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
5492 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5493 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
5494 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
5496 #ifdef CONFIG_IPV6_MROUTE
5497 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
5499 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
5500 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
5501 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5502 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
5503 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
5504 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
5505 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
5506 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
5507 /* we omit DEVCONF_STABLE_SECRET for now */
5508 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
5509 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
5510 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
5511 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
5512 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled;
5513 #ifdef CONFIG_IPV6_SEG6_HMAC
5514 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac;
5516 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad;
5517 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode;
5518 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy;
5519 array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass;
5520 array[DEVCONF_RPL_SEG_ENABLED] = cnf->rpl_seg_enabled;
5523 static inline size_t inet6_ifla6_size(void)
5525 return nla_total_size(4) /* IFLA_INET6_FLAGS */
5526 + nla_total_size(sizeof(struct ifla_cacheinfo))
5527 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5528 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
5529 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
5530 + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */
5531 + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */
5535 static inline size_t inet6_if_nlmsg_size(void)
5537 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5538 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5539 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5540 + nla_total_size(4) /* IFLA_MTU */
5541 + nla_total_size(4) /* IFLA_LINK */
5542 + nla_total_size(1) /* IFLA_OPERSTATE */
5543 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
5546 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
5550 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
5553 /* Use put_unaligned() because stats may not be aligned for u64. */
5554 put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5555 for (i = 1; i < ICMP6_MIB_MAX; i++)
5556 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
5558 memset(&stats[ICMP6_MIB_MAX], 0, pad);
5561 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
5562 int bytes, size_t syncpoff)
5565 u64 buff[IPSTATS_MIB_MAX];
5566 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5570 memset(buff, 0, sizeof(buff));
5571 buff[0] = IPSTATS_MIB_MAX;
5573 for_each_possible_cpu(c) {
5574 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5575 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5578 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5579 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
5582 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5586 case IFLA_INET6_STATS:
5587 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5588 offsetof(struct ipstats_mib, syncp));
5590 case IFLA_INET6_ICMP6STATS:
5591 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
5596 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5597 u32 ext_filter_mask)
5600 struct ifla_cacheinfo ci;
5602 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5603 goto nla_put_failure;
5604 ci.max_reasm_len = IPV6_MAXPLEN;
5605 ci.tstamp = cstamp_delta(idev->tstamp);
5606 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
5607 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
5608 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5609 goto nla_put_failure;
5610 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
5612 goto nla_put_failure;
5613 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5615 /* XXX - MC not implemented */
5617 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5620 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
5622 goto nla_put_failure;
5623 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5625 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
5627 goto nla_put_failure;
5628 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5630 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
5632 goto nla_put_failure;
5633 read_lock_bh(&idev->lock);
5634 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5635 read_unlock_bh(&idev->lock);
5637 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode))
5638 goto nla_put_failure;
5646 static size_t inet6_get_link_af_size(const struct net_device *dev,
5647 u32 ext_filter_mask)
5649 if (!__in6_dev_get(dev))
5652 return inet6_ifla6_size();
5655 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5656 u32 ext_filter_mask)
5658 struct inet6_dev *idev = __in6_dev_get(dev);
5663 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
5669 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
5671 struct inet6_ifaddr *ifp;
5672 struct net_device *dev = idev->dev;
5673 bool clear_token, update_rs = false;
5674 struct in6_addr ll_addr;
5680 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5682 if (!ipv6_accept_ra(idev))
5684 if (idev->cnf.rtr_solicits == 0)
5687 write_lock_bh(&idev->lock);
5689 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5690 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5692 write_unlock_bh(&idev->lock);
5694 clear_token = ipv6_addr_any(token);
5698 if (!idev->dead && (idev->if_flags & IF_READY) &&
5699 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5700 IFA_F_OPTIMISTIC)) {
5701 /* If we're not ready, then normal ifup will take care
5702 * of this. Otherwise, we need to request our rs here.
5704 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5709 write_lock_bh(&idev->lock);
5712 idev->if_flags |= IF_RS_SENT;
5713 idev->rs_interval = rfc3315_s14_backoff_init(
5714 idev->cnf.rtr_solicit_interval);
5715 idev->rs_probes = 1;
5716 addrconf_mod_rs_timer(idev, idev->rs_interval);
5719 /* Well, that's kinda nasty ... */
5720 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5721 spin_lock(&ifp->lock);
5722 if (ifp->tokenized) {
5724 ifp->prefered_lft = 0;
5726 spin_unlock(&ifp->lock);
5729 write_unlock_bh(&idev->lock);
5730 inet6_ifinfo_notify(RTM_NEWLINK, idev);
5731 addrconf_verify_rtnl();
5735 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5736 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5737 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5740 static int check_addr_gen_mode(int mode)
5742 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5743 mode != IN6_ADDR_GEN_MODE_NONE &&
5744 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5745 mode != IN6_ADDR_GEN_MODE_RANDOM)
5750 static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5753 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5754 !idev->cnf.stable_secret.initialized &&
5755 !net->ipv6.devconf_dflt->stable_secret.initialized)
5760 static int inet6_validate_link_af(const struct net_device *dev,
5761 const struct nlattr *nla)
5763 struct nlattr *tb[IFLA_INET6_MAX + 1];
5764 struct inet6_dev *idev = NULL;
5768 idev = __in6_dev_get(dev);
5770 return -EAFNOSUPPORT;
5773 err = nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla,
5774 inet6_af_policy, NULL);
5778 if (!tb[IFLA_INET6_TOKEN] && !tb[IFLA_INET6_ADDR_GEN_MODE])
5781 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5782 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5784 if (check_addr_gen_mode(mode) < 0)
5786 if (dev && check_stable_privacy(idev, dev_net(dev), mode) < 0)
5793 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5795 struct inet6_dev *idev = __in6_dev_get(dev);
5796 struct nlattr *tb[IFLA_INET6_MAX + 1];
5800 return -EAFNOSUPPORT;
5802 if (nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0)
5805 if (tb[IFLA_INET6_TOKEN]) {
5806 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
5811 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5812 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5814 idev->cnf.addr_gen_mode = mode;
5820 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
5821 u32 portid, u32 seq, int event, unsigned int flags)
5823 struct net_device *dev = idev->dev;
5824 struct ifinfomsg *hdr;
5825 struct nlmsghdr *nlh;
5828 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
5832 hdr = nlmsg_data(nlh);
5833 hdr->ifi_family = AF_INET6;
5835 hdr->ifi_type = dev->type;
5836 hdr->ifi_index = dev->ifindex;
5837 hdr->ifi_flags = dev_get_flags(dev);
5838 hdr->ifi_change = 0;
5840 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5842 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5843 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
5844 (dev->ifindex != dev_get_iflink(dev) &&
5845 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5846 nla_put_u8(skb, IFLA_OPERSTATE,
5847 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
5848 goto nla_put_failure;
5849 protoinfo = nla_nest_start_noflag(skb, IFLA_PROTINFO);
5851 goto nla_put_failure;
5853 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
5854 goto nla_put_failure;
5856 nla_nest_end(skb, protoinfo);
5857 nlmsg_end(skb, nlh);
5861 nlmsg_cancel(skb, nlh);
5865 static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh,
5866 struct netlink_ext_ack *extack)
5868 struct ifinfomsg *ifm;
5870 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5871 NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request");
5875 if (nlmsg_attrlen(nlh, sizeof(*ifm))) {
5876 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header");
5880 ifm = nlmsg_data(nlh);
5881 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
5882 ifm->ifi_change || ifm->ifi_index) {
5883 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request");
5890 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5892 struct net *net = sock_net(skb->sk);
5895 struct net_device *dev;
5896 struct inet6_dev *idev;
5897 struct hlist_head *head;
5899 /* only requests using strict checking can pass data to
5900 * influence the dump
5902 if (cb->strict_check) {
5903 int err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack);
5910 s_idx = cb->args[1];
5913 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5915 head = &net->dev_index_head[h];
5916 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5919 idev = __in6_dev_get(dev);
5922 if (inet6_fill_ifinfo(skb, idev,
5923 NETLINK_CB(cb->skb).portid,
5925 RTM_NEWLINK, NLM_F_MULTI) < 0)
5939 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5941 struct sk_buff *skb;
5942 struct net *net = dev_net(idev->dev);
5945 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
5949 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
5951 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5952 WARN_ON(err == -EMSGSIZE);
5956 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
5960 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
5963 static inline size_t inet6_prefix_nlmsg_size(void)
5965 return NLMSG_ALIGN(sizeof(struct prefixmsg))
5966 + nla_total_size(sizeof(struct in6_addr))
5967 + nla_total_size(sizeof(struct prefix_cacheinfo));
5970 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
5971 struct prefix_info *pinfo, u32 portid, u32 seq,
5972 int event, unsigned int flags)
5974 struct prefixmsg *pmsg;
5975 struct nlmsghdr *nlh;
5976 struct prefix_cacheinfo ci;
5978 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
5982 pmsg = nlmsg_data(nlh);
5983 pmsg->prefix_family = AF_INET6;
5984 pmsg->prefix_pad1 = 0;
5985 pmsg->prefix_pad2 = 0;
5986 pmsg->prefix_ifindex = idev->dev->ifindex;
5987 pmsg->prefix_len = pinfo->prefix_len;
5988 pmsg->prefix_type = pinfo->type;
5989 pmsg->prefix_pad3 = 0;
5990 pmsg->prefix_flags = 0;
5992 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5993 if (pinfo->autoconf)
5994 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5996 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5997 goto nla_put_failure;
5998 ci.preferred_time = ntohl(pinfo->prefered);
5999 ci.valid_time = ntohl(pinfo->valid);
6000 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
6001 goto nla_put_failure;
6002 nlmsg_end(skb, nlh);
6006 nlmsg_cancel(skb, nlh);
6010 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
6011 struct prefix_info *pinfo)
6013 struct sk_buff *skb;
6014 struct net *net = dev_net(idev->dev);
6017 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
6021 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
6023 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
6024 WARN_ON(err == -EMSGSIZE);
6028 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
6032 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
6035 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
6037 struct net *net = dev_net(ifp->idev->dev);
6042 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
6047 * If the address was optimistic we inserted the route at the
6048 * start of our DAD process, so we don't need to do it again.
6049 * If the device was taken down in the middle of the DAD
6050 * cycle there is a race where we could get here without a
6051 * host route, so nothing to insert. That will be fixed when
6052 * the device is brought up.
6054 if (ifp->rt && !rcu_access_pointer(ifp->rt->fib6_node)) {
6055 ip6_ins_rt(net, ifp->rt);
6056 } else if (!ifp->rt && (ifp->idev->dev->flags & IFF_UP)) {
6057 pr_warn("BUG: Address %pI6c on device %s is missing its host route.\n",
6058 &ifp->addr, ifp->idev->dev->name);
6061 if (ifp->idev->cnf.forwarding)
6062 addrconf_join_anycast(ifp);
6063 if (!ipv6_addr_any(&ifp->peer_addr))
6064 addrconf_prefix_route(&ifp->peer_addr, 128,
6065 ifp->rt_priority, ifp->idev->dev,
6069 if (ifp->idev->cnf.forwarding)
6070 addrconf_leave_anycast(ifp);
6071 addrconf_leave_solict(ifp->idev, &ifp->addr);
6072 if (!ipv6_addr_any(&ifp->peer_addr)) {
6073 struct fib6_info *rt;
6075 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
6076 ifp->idev->dev, 0, 0,
6079 ip6_del_rt(net, rt, false);
6082 ip6_del_rt(net, ifp->rt, false);
6085 rt_genid_bump_ipv6(net);
6088 atomic_inc(&net->ipv6.dev_addr_genid);
6091 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
6094 if (likely(ifp->idev->dead == 0))
6095 __ipv6_ifa_notify(event, ifp);
6096 rcu_read_unlock_bh();
6099 #ifdef CONFIG_SYSCTL
6101 static int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
6102 void *buffer, size_t *lenp, loff_t *ppos)
6104 int *valp = ctl->data;
6107 struct ctl_table lctl;
6111 * ctl->data points to idev->cnf.forwarding, we should
6112 * not modify it until we get the rtnl lock.
6117 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6120 ret = addrconf_fixup_forwarding(ctl, valp, val);
6126 static int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
6127 void *buffer, size_t *lenp, loff_t *ppos)
6129 struct inet6_dev *idev = ctl->extra1;
6130 int min_mtu = IPV6_MIN_MTU;
6131 struct ctl_table lctl;
6134 lctl.extra1 = &min_mtu;
6135 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
6137 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
6140 static void dev_disable_change(struct inet6_dev *idev)
6142 struct netdev_notifier_info info;
6144 if (!idev || !idev->dev)
6147 netdev_notifier_info_init(&info, idev->dev);
6148 if (idev->cnf.disable_ipv6)
6149 addrconf_notify(NULL, NETDEV_DOWN, &info);
6151 addrconf_notify(NULL, NETDEV_UP, &info);
6154 static void addrconf_disable_change(struct net *net, __s32 newf)
6156 struct net_device *dev;
6157 struct inet6_dev *idev;
6159 for_each_netdev(net, dev) {
6160 idev = __in6_dev_get(dev);
6162 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
6163 idev->cnf.disable_ipv6 = newf;
6165 dev_disable_change(idev);
6170 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
6175 if (!rtnl_trylock())
6176 return restart_syscall();
6178 net = (struct net *)table->extra2;
6182 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
6187 if (p == &net->ipv6.devconf_all->disable_ipv6) {
6188 net->ipv6.devconf_dflt->disable_ipv6 = newf;
6189 addrconf_disable_change(net, newf);
6190 } else if ((!newf) ^ (!old))
6191 dev_disable_change((struct inet6_dev *)table->extra1);
6197 static int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
6198 void *buffer, size_t *lenp, loff_t *ppos)
6200 int *valp = ctl->data;
6203 struct ctl_table lctl;
6207 * ctl->data points to idev->cnf.disable_ipv6, we should
6208 * not modify it until we get the rtnl lock.
6213 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6216 ret = addrconf_disable_ipv6(ctl, valp, val);
6222 static int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
6223 void *buffer, size_t *lenp, loff_t *ppos)
6225 int *valp = ctl->data;
6230 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
6233 if (write && old != new) {
6234 struct net *net = ctl->extra2;
6236 if (!rtnl_trylock())
6237 return restart_syscall();
6239 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
6240 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6241 NETCONFA_PROXY_NEIGH,
6242 NETCONFA_IFINDEX_DEFAULT,
6243 net->ipv6.devconf_dflt);
6244 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
6245 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6246 NETCONFA_PROXY_NEIGH,
6247 NETCONFA_IFINDEX_ALL,
6248 net->ipv6.devconf_all);
6250 struct inet6_dev *idev = ctl->extra1;
6252 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6253 NETCONFA_PROXY_NEIGH,
6263 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
6264 void *buffer, size_t *lenp,
6269 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
6270 struct net *net = (struct net *)ctl->extra2;
6271 struct ctl_table tmp = {
6273 .maxlen = sizeof(new_val),
6277 if (!rtnl_trylock())
6278 return restart_syscall();
6280 new_val = *((u32 *)ctl->data);
6282 ret = proc_douintvec(&tmp, write, buffer, lenp, ppos);
6287 if (check_addr_gen_mode(new_val) < 0) {
6293 if (check_stable_privacy(idev, net, new_val) < 0) {
6298 if (idev->cnf.addr_gen_mode != new_val) {
6299 idev->cnf.addr_gen_mode = new_val;
6300 addrconf_dev_config(idev->dev);
6302 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) {
6303 struct net_device *dev;
6305 net->ipv6.devconf_dflt->addr_gen_mode = new_val;
6306 for_each_netdev(net, dev) {
6307 idev = __in6_dev_get(dev);
6309 idev->cnf.addr_gen_mode != new_val) {
6310 idev->cnf.addr_gen_mode = new_val;
6311 addrconf_dev_config(idev->dev);
6316 *((u32 *)ctl->data) = new_val;
6325 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
6326 void *buffer, size_t *lenp,
6330 struct in6_addr addr;
6331 char str[IPV6_MAX_STRLEN];
6332 struct ctl_table lctl = *ctl;
6333 struct net *net = ctl->extra2;
6334 struct ipv6_stable_secret *secret = ctl->data;
6336 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
6339 lctl.maxlen = IPV6_MAX_STRLEN;
6342 if (!rtnl_trylock())
6343 return restart_syscall();
6345 if (!write && !secret->initialized) {
6350 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
6351 if (err >= sizeof(str)) {
6356 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
6360 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
6365 secret->initialized = true;
6366 secret->secret = addr;
6368 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
6369 struct net_device *dev;
6371 for_each_netdev(net, dev) {
6372 struct inet6_dev *idev = __in6_dev_get(dev);
6375 idev->cnf.addr_gen_mode =
6376 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
6380 struct inet6_dev *idev = ctl->extra1;
6382 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
6392 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
6393 int write, void *buffer,
6397 int *valp = ctl->data;
6400 struct ctl_table lctl;
6403 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
6404 * we should not modify it until we get the rtnl lock.
6409 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6412 ret = addrconf_fixup_linkdown(ctl, valp, val);
6419 void addrconf_set_nopolicy(struct rt6_info *rt, int action)
6423 rt->dst.flags |= DST_NOPOLICY;
6425 rt->dst.flags &= ~DST_NOPOLICY;
6430 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
6432 struct inet6_ifaddr *ifa;
6434 read_lock_bh(&idev->lock);
6435 list_for_each_entry(ifa, &idev->addr_list, if_list) {
6436 spin_lock(&ifa->lock);
6438 /* host routes only use builtin fib6_nh */
6439 struct fib6_nh *nh = ifa->rt->fib6_nh;
6443 ifa->rt->dst_nopolicy = val ? true : false;
6444 if (nh->rt6i_pcpu) {
6445 for_each_possible_cpu(cpu) {
6446 struct rt6_info **rtp;
6448 rtp = per_cpu_ptr(nh->rt6i_pcpu, cpu);
6449 addrconf_set_nopolicy(*rtp, val);
6454 spin_unlock(&ifa->lock);
6456 read_unlock_bh(&idev->lock);
6460 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val)
6462 struct inet6_dev *idev;
6465 if (!rtnl_trylock())
6466 return restart_syscall();
6470 net = (struct net *)ctl->extra2;
6471 if (valp == &net->ipv6.devconf_dflt->disable_policy) {
6476 if (valp == &net->ipv6.devconf_all->disable_policy) {
6477 struct net_device *dev;
6479 for_each_netdev(net, dev) {
6480 idev = __in6_dev_get(dev);
6482 addrconf_disable_policy_idev(idev, val);
6485 idev = (struct inet6_dev *)ctl->extra1;
6486 addrconf_disable_policy_idev(idev, val);
6493 static int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write,
6494 void *buffer, size_t *lenp, loff_t *ppos)
6496 int *valp = ctl->data;
6499 struct ctl_table lctl;
6504 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6506 if (write && (*valp != val))
6507 ret = addrconf_disable_policy(ctl, valp, val);
6515 static int minus_one = -1;
6516 static const int two_five_five = 255;
6518 static const struct ctl_table addrconf_sysctl[] = {
6520 .procname = "forwarding",
6521 .data = &ipv6_devconf.forwarding,
6522 .maxlen = sizeof(int),
6524 .proc_handler = addrconf_sysctl_forward,
6527 .procname = "hop_limit",
6528 .data = &ipv6_devconf.hop_limit,
6529 .maxlen = sizeof(int),
6531 .proc_handler = proc_dointvec_minmax,
6532 .extra1 = (void *)SYSCTL_ONE,
6533 .extra2 = (void *)&two_five_five,
6537 .data = &ipv6_devconf.mtu6,
6538 .maxlen = sizeof(int),
6540 .proc_handler = addrconf_sysctl_mtu,
6543 .procname = "accept_ra",
6544 .data = &ipv6_devconf.accept_ra,
6545 .maxlen = sizeof(int),
6547 .proc_handler = proc_dointvec,
6550 .procname = "accept_redirects",
6551 .data = &ipv6_devconf.accept_redirects,
6552 .maxlen = sizeof(int),
6554 .proc_handler = proc_dointvec,
6557 .procname = "autoconf",
6558 .data = &ipv6_devconf.autoconf,
6559 .maxlen = sizeof(int),
6561 .proc_handler = proc_dointvec,
6564 .procname = "dad_transmits",
6565 .data = &ipv6_devconf.dad_transmits,
6566 .maxlen = sizeof(int),
6568 .proc_handler = proc_dointvec,
6571 .procname = "router_solicitations",
6572 .data = &ipv6_devconf.rtr_solicits,
6573 .maxlen = sizeof(int),
6575 .proc_handler = proc_dointvec_minmax,
6576 .extra1 = &minus_one,
6579 .procname = "router_solicitation_interval",
6580 .data = &ipv6_devconf.rtr_solicit_interval,
6581 .maxlen = sizeof(int),
6583 .proc_handler = proc_dointvec_jiffies,
6586 .procname = "router_solicitation_max_interval",
6587 .data = &ipv6_devconf.rtr_solicit_max_interval,
6588 .maxlen = sizeof(int),
6590 .proc_handler = proc_dointvec_jiffies,
6593 .procname = "router_solicitation_delay",
6594 .data = &ipv6_devconf.rtr_solicit_delay,
6595 .maxlen = sizeof(int),
6597 .proc_handler = proc_dointvec_jiffies,
6600 .procname = "force_mld_version",
6601 .data = &ipv6_devconf.force_mld_version,
6602 .maxlen = sizeof(int),
6604 .proc_handler = proc_dointvec,
6607 .procname = "mldv1_unsolicited_report_interval",
6609 &ipv6_devconf.mldv1_unsolicited_report_interval,
6610 .maxlen = sizeof(int),
6612 .proc_handler = proc_dointvec_ms_jiffies,
6615 .procname = "mldv2_unsolicited_report_interval",
6617 &ipv6_devconf.mldv2_unsolicited_report_interval,
6618 .maxlen = sizeof(int),
6620 .proc_handler = proc_dointvec_ms_jiffies,
6623 .procname = "use_tempaddr",
6624 .data = &ipv6_devconf.use_tempaddr,
6625 .maxlen = sizeof(int),
6627 .proc_handler = proc_dointvec,
6630 .procname = "temp_valid_lft",
6631 .data = &ipv6_devconf.temp_valid_lft,
6632 .maxlen = sizeof(int),
6634 .proc_handler = proc_dointvec,
6637 .procname = "temp_prefered_lft",
6638 .data = &ipv6_devconf.temp_prefered_lft,
6639 .maxlen = sizeof(int),
6641 .proc_handler = proc_dointvec,
6644 .procname = "regen_max_retry",
6645 .data = &ipv6_devconf.regen_max_retry,
6646 .maxlen = sizeof(int),
6648 .proc_handler = proc_dointvec,
6651 .procname = "max_desync_factor",
6652 .data = &ipv6_devconf.max_desync_factor,
6653 .maxlen = sizeof(int),
6655 .proc_handler = proc_dointvec,
6658 .procname = "max_addresses",
6659 .data = &ipv6_devconf.max_addresses,
6660 .maxlen = sizeof(int),
6662 .proc_handler = proc_dointvec,
6665 .procname = "accept_ra_defrtr",
6666 .data = &ipv6_devconf.accept_ra_defrtr,
6667 .maxlen = sizeof(int),
6669 .proc_handler = proc_dointvec,
6672 .procname = "accept_ra_min_hop_limit",
6673 .data = &ipv6_devconf.accept_ra_min_hop_limit,
6674 .maxlen = sizeof(int),
6676 .proc_handler = proc_dointvec,
6679 .procname = "accept_ra_pinfo",
6680 .data = &ipv6_devconf.accept_ra_pinfo,
6681 .maxlen = sizeof(int),
6683 .proc_handler = proc_dointvec,
6685 #ifdef CONFIG_IPV6_ROUTER_PREF
6687 .procname = "accept_ra_rtr_pref",
6688 .data = &ipv6_devconf.accept_ra_rtr_pref,
6689 .maxlen = sizeof(int),
6691 .proc_handler = proc_dointvec,
6694 .procname = "router_probe_interval",
6695 .data = &ipv6_devconf.rtr_probe_interval,
6696 .maxlen = sizeof(int),
6698 .proc_handler = proc_dointvec_jiffies,
6700 #ifdef CONFIG_IPV6_ROUTE_INFO
6702 .procname = "accept_ra_rt_info_min_plen",
6703 .data = &ipv6_devconf.accept_ra_rt_info_min_plen,
6704 .maxlen = sizeof(int),
6706 .proc_handler = proc_dointvec,
6709 .procname = "accept_ra_rt_info_max_plen",
6710 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
6711 .maxlen = sizeof(int),
6713 .proc_handler = proc_dointvec,
6718 .procname = "proxy_ndp",
6719 .data = &ipv6_devconf.proxy_ndp,
6720 .maxlen = sizeof(int),
6722 .proc_handler = addrconf_sysctl_proxy_ndp,
6725 .procname = "accept_source_route",
6726 .data = &ipv6_devconf.accept_source_route,
6727 .maxlen = sizeof(int),
6729 .proc_handler = proc_dointvec,
6731 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
6733 .procname = "optimistic_dad",
6734 .data = &ipv6_devconf.optimistic_dad,
6735 .maxlen = sizeof(int),
6737 .proc_handler = proc_dointvec,
6740 .procname = "use_optimistic",
6741 .data = &ipv6_devconf.use_optimistic,
6742 .maxlen = sizeof(int),
6744 .proc_handler = proc_dointvec,
6747 #ifdef CONFIG_IPV6_MROUTE
6749 .procname = "mc_forwarding",
6750 .data = &ipv6_devconf.mc_forwarding,
6751 .maxlen = sizeof(int),
6753 .proc_handler = proc_dointvec,
6757 .procname = "disable_ipv6",
6758 .data = &ipv6_devconf.disable_ipv6,
6759 .maxlen = sizeof(int),
6761 .proc_handler = addrconf_sysctl_disable,
6764 .procname = "accept_dad",
6765 .data = &ipv6_devconf.accept_dad,
6766 .maxlen = sizeof(int),
6768 .proc_handler = proc_dointvec,
6771 .procname = "force_tllao",
6772 .data = &ipv6_devconf.force_tllao,
6773 .maxlen = sizeof(int),
6775 .proc_handler = proc_dointvec
6778 .procname = "ndisc_notify",
6779 .data = &ipv6_devconf.ndisc_notify,
6780 .maxlen = sizeof(int),
6782 .proc_handler = proc_dointvec
6785 .procname = "suppress_frag_ndisc",
6786 .data = &ipv6_devconf.suppress_frag_ndisc,
6787 .maxlen = sizeof(int),
6789 .proc_handler = proc_dointvec
6792 .procname = "accept_ra_from_local",
6793 .data = &ipv6_devconf.accept_ra_from_local,
6794 .maxlen = sizeof(int),
6796 .proc_handler = proc_dointvec,
6799 .procname = "accept_ra_mtu",
6800 .data = &ipv6_devconf.accept_ra_mtu,
6801 .maxlen = sizeof(int),
6803 .proc_handler = proc_dointvec,
6806 .procname = "stable_secret",
6807 .data = &ipv6_devconf.stable_secret,
6808 .maxlen = IPV6_MAX_STRLEN,
6810 .proc_handler = addrconf_sysctl_stable_secret,
6813 .procname = "use_oif_addrs_only",
6814 .data = &ipv6_devconf.use_oif_addrs_only,
6815 .maxlen = sizeof(int),
6817 .proc_handler = proc_dointvec,
6820 .procname = "ignore_routes_with_linkdown",
6821 .data = &ipv6_devconf.ignore_routes_with_linkdown,
6822 .maxlen = sizeof(int),
6824 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
6827 .procname = "drop_unicast_in_l2_multicast",
6828 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
6829 .maxlen = sizeof(int),
6831 .proc_handler = proc_dointvec,
6834 .procname = "drop_unsolicited_na",
6835 .data = &ipv6_devconf.drop_unsolicited_na,
6836 .maxlen = sizeof(int),
6838 .proc_handler = proc_dointvec,
6841 .procname = "keep_addr_on_down",
6842 .data = &ipv6_devconf.keep_addr_on_down,
6843 .maxlen = sizeof(int),
6845 .proc_handler = proc_dointvec,
6849 .procname = "seg6_enabled",
6850 .data = &ipv6_devconf.seg6_enabled,
6851 .maxlen = sizeof(int),
6853 .proc_handler = proc_dointvec,
6855 #ifdef CONFIG_IPV6_SEG6_HMAC
6857 .procname = "seg6_require_hmac",
6858 .data = &ipv6_devconf.seg6_require_hmac,
6859 .maxlen = sizeof(int),
6861 .proc_handler = proc_dointvec,
6865 .procname = "enhanced_dad",
6866 .data = &ipv6_devconf.enhanced_dad,
6867 .maxlen = sizeof(int),
6869 .proc_handler = proc_dointvec,
6872 .procname = "addr_gen_mode",
6873 .data = &ipv6_devconf.addr_gen_mode,
6874 .maxlen = sizeof(int),
6876 .proc_handler = addrconf_sysctl_addr_gen_mode,
6879 .procname = "disable_policy",
6880 .data = &ipv6_devconf.disable_policy,
6881 .maxlen = sizeof(int),
6883 .proc_handler = addrconf_sysctl_disable_policy,
6886 .procname = "ndisc_tclass",
6887 .data = &ipv6_devconf.ndisc_tclass,
6888 .maxlen = sizeof(int),
6890 .proc_handler = proc_dointvec_minmax,
6891 .extra1 = (void *)SYSCTL_ZERO,
6892 .extra2 = (void *)&two_five_five,
6895 .procname = "rpl_seg_enabled",
6896 .data = &ipv6_devconf.rpl_seg_enabled,
6897 .maxlen = sizeof(int),
6899 .proc_handler = proc_dointvec,
6906 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
6907 struct inet6_dev *idev, struct ipv6_devconf *p)
6910 struct ctl_table *table;
6911 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
6913 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
6917 for (i = 0; table[i].data; i++) {
6918 table[i].data += (char *)p - (char *)&ipv6_devconf;
6919 /* If one of these is already set, then it is not safe to
6920 * overwrite either of them: this makes proc_dointvec_minmax
6923 if (!table[i].extra1 && !table[i].extra2) {
6924 table[i].extra1 = idev; /* embedded; no ref */
6925 table[i].extra2 = net;
6929 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
6931 p->sysctl_header = register_net_sysctl(net, path, table);
6932 if (!p->sysctl_header)
6935 if (!strcmp(dev_name, "all"))
6936 ifindex = NETCONFA_IFINDEX_ALL;
6937 else if (!strcmp(dev_name, "default"))
6938 ifindex = NETCONFA_IFINDEX_DEFAULT;
6940 ifindex = idev->dev->ifindex;
6941 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
6951 static void __addrconf_sysctl_unregister(struct net *net,
6952 struct ipv6_devconf *p, int ifindex)
6954 struct ctl_table *table;
6956 if (!p->sysctl_header)
6959 table = p->sysctl_header->ctl_table_arg;
6960 unregister_net_sysctl_table(p->sysctl_header);
6961 p->sysctl_header = NULL;
6964 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
6967 static int addrconf_sysctl_register(struct inet6_dev *idev)
6971 if (!sysctl_dev_name_is_allowed(idev->dev->name))
6974 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
6975 &ndisc_ifinfo_sysctl_change);
6978 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
6981 neigh_sysctl_unregister(idev->nd_parms);
6986 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
6988 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf,
6989 idev->dev->ifindex);
6990 neigh_sysctl_unregister(idev->nd_parms);
6996 static int __net_init addrconf_init_net(struct net *net)
6999 struct ipv6_devconf *all, *dflt;
7001 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
7005 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
7007 goto err_alloc_dflt;
7009 if (IS_ENABLED(CONFIG_SYSCTL) &&
7010 !net_eq(net, &init_net)) {
7011 switch (sysctl_devconf_inherit_init_net) {
7012 case 1: /* copy from init_net */
7013 memcpy(all, init_net.ipv6.devconf_all,
7014 sizeof(ipv6_devconf));
7015 memcpy(dflt, init_net.ipv6.devconf_dflt,
7016 sizeof(ipv6_devconf_dflt));
7018 case 3: /* copy from the current netns */
7019 memcpy(all, current->nsproxy->net_ns->ipv6.devconf_all,
7020 sizeof(ipv6_devconf));
7022 current->nsproxy->net_ns->ipv6.devconf_dflt,
7023 sizeof(ipv6_devconf_dflt));
7027 /* use compiled values */
7032 /* these will be inherited by all namespaces */
7033 dflt->autoconf = ipv6_defaults.autoconf;
7034 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
7036 dflt->stable_secret.initialized = false;
7037 all->stable_secret.initialized = false;
7039 net->ipv6.devconf_all = all;
7040 net->ipv6.devconf_dflt = dflt;
7042 #ifdef CONFIG_SYSCTL
7043 err = __addrconf_sysctl_register(net, "all", NULL, all);
7047 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
7053 #ifdef CONFIG_SYSCTL
7055 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
7065 static void __net_exit addrconf_exit_net(struct net *net)
7067 #ifdef CONFIG_SYSCTL
7068 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt,
7069 NETCONFA_IFINDEX_DEFAULT);
7070 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all,
7071 NETCONFA_IFINDEX_ALL);
7073 kfree(net->ipv6.devconf_dflt);
7074 kfree(net->ipv6.devconf_all);
7077 static struct pernet_operations addrconf_ops = {
7078 .init = addrconf_init_net,
7079 .exit = addrconf_exit_net,
7082 static struct rtnl_af_ops inet6_ops __read_mostly = {
7084 .fill_link_af = inet6_fill_link_af,
7085 .get_link_af_size = inet6_get_link_af_size,
7086 .validate_link_af = inet6_validate_link_af,
7087 .set_link_af = inet6_set_link_af,
7091 * Init / cleanup code
7094 int __init addrconf_init(void)
7096 struct inet6_dev *idev;
7099 err = ipv6_addr_label_init();
7101 pr_crit("%s: cannot initialize default policy table: %d\n",
7106 err = register_pernet_subsys(&addrconf_ops);
7110 addrconf_wq = create_workqueue("ipv6_addrconf");
7116 /* The addrconf netdev notifier requires that loopback_dev
7117 * has it's ipv6 private information allocated and setup
7118 * before it can bring up and give link-local addresses
7119 * to other devices which are up.
7121 * Unfortunately, loopback_dev is not necessarily the first
7122 * entry in the global dev_base list of net devices. In fact,
7123 * it is likely to be the very last entry on that list.
7124 * So this causes the notifier registry below to try and
7125 * give link-local addresses to all devices besides loopback_dev
7126 * first, then loopback_dev, which cases all the non-loopback_dev
7127 * devices to fail to get a link-local address.
7129 * So, as a temporary fix, allocate the ipv6 structure for
7130 * loopback_dev first by hand.
7131 * Longer term, all of the dependencies ipv6 has upon the loopback
7132 * device and it being up should be removed.
7135 idev = ipv6_add_dev(init_net.loopback_dev);
7138 err = PTR_ERR(idev);
7142 ip6_route_init_special_entries();
7144 for (i = 0; i < IN6_ADDR_HSIZE; i++)
7145 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
7147 register_netdevice_notifier(&ipv6_dev_notf);
7151 rtnl_af_register(&inet6_ops);
7153 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK,
7154 NULL, inet6_dump_ifinfo, 0);
7158 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR,
7159 inet6_rtm_newaddr, NULL, 0);
7162 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR,
7163 inet6_rtm_deladdr, NULL, 0);
7166 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR,
7167 inet6_rtm_getaddr, inet6_dump_ifaddr,
7168 RTNL_FLAG_DOIT_UNLOCKED);
7171 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST,
7172 NULL, inet6_dump_ifmcaddr, 0);
7175 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST,
7176 NULL, inet6_dump_ifacaddr, 0);
7179 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF,
7180 inet6_netconf_get_devconf,
7181 inet6_netconf_dump_devconf,
7182 RTNL_FLAG_DOIT_UNLOCKED);
7185 err = ipv6_addr_label_rtnl_register();
7191 rtnl_unregister_all(PF_INET6);
7192 rtnl_af_unregister(&inet6_ops);
7193 unregister_netdevice_notifier(&ipv6_dev_notf);
7195 destroy_workqueue(addrconf_wq);
7197 unregister_pernet_subsys(&addrconf_ops);
7199 ipv6_addr_label_cleanup();
7204 void addrconf_cleanup(void)
7206 struct net_device *dev;
7209 unregister_netdevice_notifier(&ipv6_dev_notf);
7210 unregister_pernet_subsys(&addrconf_ops);
7211 ipv6_addr_label_cleanup();
7213 rtnl_af_unregister(&inet6_ops);
7217 /* clean dev list */
7218 for_each_netdev(&init_net, dev) {
7219 if (__in6_dev_get(dev) == NULL)
7221 addrconf_ifdown(dev, true);
7223 addrconf_ifdown(init_net.loopback_dev, true);
7228 spin_lock_bh(&addrconf_hash_lock);
7229 for (i = 0; i < IN6_ADDR_HSIZE; i++)
7230 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
7231 spin_unlock_bh(&addrconf_hash_lock);
7232 cancel_delayed_work(&addr_chk_work);
7235 destroy_workqueue(addrconf_wq);