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 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1897 const struct net_device *dev, bool skip_dev_check,
1898 int strict, u32 banned_flags)
1900 unsigned int hash = inet6_addr_hash(net, addr);
1901 const struct net_device *l3mdev;
1902 struct inet6_ifaddr *ifp;
1907 l3mdev = l3mdev_master_dev_rcu(dev);
1911 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1912 if (!net_eq(dev_net(ifp->idev->dev), net))
1915 if (l3mdev_master_dev_rcu(ifp->idev->dev) != l3mdev)
1918 /* Decouple optimistic from tentative for evaluation here.
1919 * Ban optimistic addresses explicitly, when required.
1921 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1922 ? (ifp->flags&~IFA_F_TENTATIVE)
1924 if (ipv6_addr_equal(&ifp->addr, addr) &&
1925 !(ifp_flags&banned_flags) &&
1926 (!dev || ifp->idev->dev == dev ||
1927 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1936 EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1939 /* Compares an address/prefix_len with addresses on device @dev.
1940 * If one is found it returns true.
1942 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1943 const unsigned int prefix_len, struct net_device *dev)
1945 const struct inet6_ifaddr *ifa;
1946 const struct inet6_dev *idev;
1950 idev = __in6_dev_get(dev);
1952 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
1953 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1962 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1964 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1966 const struct inet6_ifaddr *ifa;
1967 const struct inet6_dev *idev;
1972 idev = __in6_dev_get(dev);
1974 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
1975 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1984 EXPORT_SYMBOL(ipv6_chk_prefix);
1987 * ipv6_dev_find - find the first device with a given source address.
1988 * @net: the net namespace
1989 * @addr: the source address
1991 * The caller should be protected by RCU, or RTNL.
1993 struct net_device *ipv6_dev_find(struct net *net, const struct in6_addr *addr)
1995 unsigned int hash = inet6_addr_hash(net, addr);
1996 struct inet6_ifaddr *ifp, *result = NULL;
1997 struct net_device *dev = NULL;
2000 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
2001 if (net_eq(dev_net(ifp->idev->dev), net) &&
2002 ipv6_addr_equal(&ifp->addr, addr)) {
2009 struct rt6_info *rt;
2011 rt = rt6_lookup(net, addr, NULL, 0, NULL, 0);
2017 dev = result->idev->dev;
2023 EXPORT_SYMBOL(ipv6_dev_find);
2025 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
2026 struct net_device *dev, int strict)
2028 unsigned int hash = inet6_addr_hash(net, addr);
2029 struct inet6_ifaddr *ifp, *result = NULL;
2032 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
2033 if (!net_eq(dev_net(ifp->idev->dev), net))
2035 if (ipv6_addr_equal(&ifp->addr, addr)) {
2036 if (!dev || ifp->idev->dev == dev ||
2037 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
2049 /* Gets referenced address, destroys ifaddr */
2051 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
2054 ifp->flags |= IFA_F_DADFAILED;
2056 if (ifp->flags&IFA_F_TEMPORARY) {
2057 struct inet6_ifaddr *ifpub;
2058 spin_lock_bh(&ifp->lock);
2061 in6_ifa_hold(ifpub);
2062 spin_unlock_bh(&ifp->lock);
2063 ipv6_create_tempaddr(ifpub, true);
2066 spin_unlock_bh(&ifp->lock);
2069 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) {
2070 spin_lock_bh(&ifp->lock);
2071 addrconf_del_dad_work(ifp);
2072 ifp->flags |= IFA_F_TENTATIVE;
2074 ifp->flags &= ~IFA_F_OPTIMISTIC;
2075 spin_unlock_bh(&ifp->lock);
2077 ipv6_ifa_notify(0, ifp);
2084 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
2088 spin_lock_bh(&ifp->lock);
2089 if (ifp->state == INET6_IFADDR_STATE_DAD) {
2090 ifp->state = INET6_IFADDR_STATE_POSTDAD;
2093 spin_unlock_bh(&ifp->lock);
2098 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp)
2100 struct inet6_dev *idev = ifp->idev;
2101 struct net *net = dev_net(ifp->idev->dev);
2103 if (addrconf_dad_end(ifp)) {
2108 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n",
2109 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source);
2111 spin_lock_bh(&ifp->lock);
2113 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
2114 struct in6_addr new_addr;
2115 struct inet6_ifaddr *ifp2;
2116 int retries = ifp->stable_privacy_retry + 1;
2117 struct ifa6_config cfg = {
2119 .plen = ifp->prefix_len,
2120 .ifa_flags = ifp->flags,
2121 .valid_lft = ifp->valid_lft,
2122 .preferred_lft = ifp->prefered_lft,
2123 .scope = ifp->scope,
2126 if (retries > net->ipv6.sysctl.idgen_retries) {
2127 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
2128 ifp->idev->dev->name);
2132 new_addr = ifp->addr;
2133 if (ipv6_generate_stable_address(&new_addr, retries,
2137 spin_unlock_bh(&ifp->lock);
2139 if (idev->cnf.max_addresses &&
2140 ipv6_count_addresses(idev) >=
2141 idev->cnf.max_addresses)
2144 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
2145 ifp->idev->dev->name);
2147 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL);
2151 spin_lock_bh(&ifp2->lock);
2152 ifp2->stable_privacy_retry = retries;
2153 ifp2->state = INET6_IFADDR_STATE_PREDAD;
2154 spin_unlock_bh(&ifp2->lock);
2156 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
2159 spin_lock_bh(&ifp->lock);
2163 /* transition from _POSTDAD to _ERRDAD */
2164 ifp->state = INET6_IFADDR_STATE_ERRDAD;
2165 spin_unlock_bh(&ifp->lock);
2167 addrconf_mod_dad_work(ifp, 0);
2171 /* Join to solicited addr multicast group.
2172 * caller must hold RTNL */
2173 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
2175 struct in6_addr maddr;
2177 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2180 addrconf_addr_solict_mult(addr, &maddr);
2181 ipv6_dev_mc_inc(dev, &maddr);
2184 /* caller must hold RTNL */
2185 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
2187 struct in6_addr maddr;
2189 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2192 addrconf_addr_solict_mult(addr, &maddr);
2193 __ipv6_dev_mc_dec(idev, &maddr);
2196 /* caller must hold RTNL */
2197 static void addrconf_join_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_inc(ifp->idev, &addr);
2209 /* caller must hold RTNL */
2210 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
2212 struct in6_addr addr;
2214 if (ifp->prefix_len >= 127) /* RFC 6164 */
2216 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2217 if (ipv6_addr_any(&addr))
2219 __ipv6_dev_ac_dec(ifp->idev, &addr);
2222 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev)
2224 switch (dev->addr_len) {
2226 memcpy(eui, dev->dev_addr, 3);
2229 memcpy(eui + 5, dev->dev_addr + 3, 3);
2231 case EUI64_ADDR_LEN:
2232 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2242 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2244 union fwnet_hwaddr *ha;
2246 if (dev->addr_len != FWNET_ALEN)
2249 ha = (union fwnet_hwaddr *)dev->dev_addr;
2251 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2256 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2258 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2259 if (dev->addr_len != ARCNET_ALEN)
2262 eui[7] = *(u8 *)dev->dev_addr;
2266 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2268 if (dev->addr_len != INFINIBAND_ALEN)
2270 memcpy(eui, dev->dev_addr + 12, 8);
2275 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
2279 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2280 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2281 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2282 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2283 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2284 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2288 memcpy(eui + 4, &addr, 4);
2292 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2294 if (dev->priv_flags & IFF_ISATAP)
2295 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2299 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2301 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2304 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2306 memcpy(eui, dev->perm_addr, 3);
2307 memcpy(eui + 5, dev->perm_addr + 3, 3);
2314 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2316 switch (dev->type) {
2319 return addrconf_ifid_eui48(eui, dev);
2321 return addrconf_ifid_arcnet(eui, dev);
2322 case ARPHRD_INFINIBAND:
2323 return addrconf_ifid_infiniband(eui, dev);
2325 return addrconf_ifid_sit(eui, dev);
2328 return addrconf_ifid_gre(eui, dev);
2329 case ARPHRD_6LOWPAN:
2330 return addrconf_ifid_6lowpan(eui, dev);
2331 case ARPHRD_IEEE1394:
2332 return addrconf_ifid_ieee1394(eui, dev);
2333 case ARPHRD_TUNNEL6:
2336 return addrconf_ifid_ip6tnl(eui, dev);
2341 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2344 struct inet6_ifaddr *ifp;
2346 read_lock_bh(&idev->lock);
2347 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2348 if (ifp->scope > IFA_LINK)
2350 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2351 memcpy(eui, ifp->addr.s6_addr+8, 8);
2356 read_unlock_bh(&idev->lock);
2360 /* Generation of a randomized Interface Identifier
2361 * draft-ietf-6man-rfc4941bis, Section 3.3.1
2364 static void ipv6_gen_rnd_iid(struct in6_addr *addr)
2367 get_random_bytes(&addr->s6_addr[8], 8);
2369 /* <draft-ietf-6man-rfc4941bis-08.txt>, Section 3.3.1:
2370 * check if generated address is not inappropriate:
2372 * - Reserved IPv6 Interface Identifers
2373 * - XXX: already assigned to an address on the device
2376 /* Subnet-router anycast: 0000:0000:0000:0000 */
2377 if (!(addr->s6_addr32[2] | addr->s6_addr32[3]))
2380 /* IANA Ethernet block: 0200:5EFF:FE00:0000-0200:5EFF:FE00:5212
2381 * Proxy Mobile IPv6: 0200:5EFF:FE00:5213
2382 * IANA Ethernet block: 0200:5EFF:FE00:5214-0200:5EFF:FEFF:FFFF
2384 if (ntohl(addr->s6_addr32[2]) == 0x02005eff &&
2385 (ntohl(addr->s6_addr32[3]) & 0Xff000000) == 0xfe000000)
2388 /* Reserved subnet anycast addresses */
2389 if (ntohl(addr->s6_addr32[2]) == 0xfdffffff &&
2390 ntohl(addr->s6_addr32[3]) >= 0Xffffff80)
2399 addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric,
2400 struct net_device *dev, unsigned long expires,
2401 u32 flags, gfp_t gfp_flags)
2403 struct fib6_config cfg = {
2404 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
2405 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF,
2406 .fc_ifindex = dev->ifindex,
2407 .fc_expires = expires,
2409 .fc_flags = RTF_UP | flags,
2410 .fc_nlinfo.nl_net = dev_net(dev),
2411 .fc_protocol = RTPROT_KERNEL,
2412 .fc_type = RTN_UNICAST,
2417 /* Prevent useless cloning on PtP SIT.
2418 This thing is done here expecting that the whole
2419 class of non-broadcast devices need not cloning.
2421 #if IS_ENABLED(CONFIG_IPV6_SIT)
2422 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2423 cfg.fc_flags |= RTF_NONEXTHOP;
2426 ip6_route_add(&cfg, gfp_flags, NULL);
2430 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2432 const struct net_device *dev,
2433 u32 flags, u32 noflags,
2436 struct fib6_node *fn;
2437 struct fib6_info *rt = NULL;
2438 struct fib6_table *table;
2439 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
2441 table = fib6_get_table(dev_net(dev), tb_id);
2446 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true);
2450 for_each_fib6_node_rt_rcu(fn) {
2451 /* prefix routes only use builtin fib6_nh */
2455 if (rt->fib6_nh->fib_nh_dev->ifindex != dev->ifindex)
2457 if (no_gw && rt->fib6_nh->fib_nh_gw_family)
2459 if ((rt->fib6_flags & flags) != flags)
2461 if ((rt->fib6_flags & noflags) != 0)
2463 if (!fib6_info_hold_safe(rt))
2473 /* Create "default" multicast route to the interface */
2475 static void addrconf_add_mroute(struct net_device *dev)
2477 struct fib6_config cfg = {
2478 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2479 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2480 .fc_ifindex = dev->ifindex,
2483 .fc_type = RTN_UNICAST,
2484 .fc_nlinfo.nl_net = dev_net(dev),
2487 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2489 ip6_route_add(&cfg, GFP_KERNEL, NULL);
2492 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2494 struct inet6_dev *idev;
2498 idev = ipv6_find_idev(dev);
2502 if (idev->cnf.disable_ipv6)
2503 return ERR_PTR(-EACCES);
2505 /* Add default multicast route */
2506 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
2507 addrconf_add_mroute(dev);
2512 static void manage_tempaddrs(struct inet6_dev *idev,
2513 struct inet6_ifaddr *ifp,
2514 __u32 valid_lft, __u32 prefered_lft,
2515 bool create, unsigned long now)
2518 struct inet6_ifaddr *ift;
2520 read_lock_bh(&idev->lock);
2521 /* update all temporary addresses in the list */
2522 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2523 int age, max_valid, max_prefered;
2525 if (ifp != ift->ifpub)
2528 /* RFC 4941 section 3.3:
2529 * If a received option will extend the lifetime of a public
2530 * address, the lifetimes of temporary addresses should
2531 * be extended, subject to the overall constraint that no
2532 * temporary addresses should ever remain "valid" or "preferred"
2533 * for a time longer than (TEMP_VALID_LIFETIME) or
2534 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2536 age = (now - ift->cstamp) / HZ;
2537 max_valid = idev->cnf.temp_valid_lft - age;
2541 max_prefered = idev->cnf.temp_prefered_lft -
2542 idev->desync_factor - age;
2543 if (max_prefered < 0)
2546 if (valid_lft > max_valid)
2547 valid_lft = max_valid;
2549 if (prefered_lft > max_prefered)
2550 prefered_lft = max_prefered;
2552 spin_lock(&ift->lock);
2554 ift->valid_lft = valid_lft;
2555 ift->prefered_lft = prefered_lft;
2557 if (prefered_lft > 0)
2558 ift->flags &= ~IFA_F_DEPRECATED;
2560 spin_unlock(&ift->lock);
2561 if (!(flags&IFA_F_TENTATIVE))
2562 ipv6_ifa_notify(0, ift);
2565 if ((create || list_empty(&idev->tempaddr_list)) &&
2566 idev->cnf.use_tempaddr > 0) {
2567 /* When a new public address is created as described
2568 * in [ADDRCONF], also create a new temporary address.
2569 * Also create a temporary address if it's enabled but
2570 * no temporary address currently exists.
2572 read_unlock_bh(&idev->lock);
2573 ipv6_create_tempaddr(ifp, false);
2575 read_unlock_bh(&idev->lock);
2579 static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2581 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2582 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2585 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2586 const struct prefix_info *pinfo,
2587 struct inet6_dev *in6_dev,
2588 const struct in6_addr *addr, int addr_type,
2589 u32 addr_flags, bool sllao, bool tokenized,
2590 __u32 valid_lft, u32 prefered_lft)
2592 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2595 if (!ifp && valid_lft) {
2596 int max_addresses = in6_dev->cnf.max_addresses;
2597 struct ifa6_config cfg = {
2599 .plen = pinfo->prefix_len,
2600 .ifa_flags = addr_flags,
2601 .valid_lft = valid_lft,
2602 .preferred_lft = prefered_lft,
2603 .scope = addr_type & IPV6_ADDR_SCOPE_MASK,
2606 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2607 if ((net->ipv6.devconf_all->optimistic_dad ||
2608 in6_dev->cnf.optimistic_dad) &&
2609 !net->ipv6.devconf_all->forwarding && sllao)
2610 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
2613 /* Do not allow to create too much of autoconfigured
2614 * addresses; this would be too easy way to crash kernel.
2616 if (!max_addresses ||
2617 ipv6_count_addresses(in6_dev) < max_addresses)
2618 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL);
2620 if (IS_ERR_OR_NULL(ifp))
2624 spin_lock_bh(&ifp->lock);
2625 ifp->flags |= IFA_F_MANAGETEMPADDR;
2626 ifp->cstamp = jiffies;
2627 ifp->tokenized = tokenized;
2628 spin_unlock_bh(&ifp->lock);
2629 addrconf_dad_start(ifp);
2637 /* Update lifetime (RFC4862 5.5.3 e)
2638 * We deviate from RFC4862 by honoring all Valid Lifetimes to
2639 * improve the reaction of SLAAC to renumbering events
2640 * (draft-gont-6man-slaac-renum-06, Section 4.2)
2642 spin_lock_bh(&ifp->lock);
2644 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2645 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2649 if (!create && stored_lft) {
2650 ifp->valid_lft = valid_lft;
2651 ifp->prefered_lft = prefered_lft;
2654 ifp->flags &= ~IFA_F_DEPRECATED;
2655 spin_unlock_bh(&ifp->lock);
2657 if (!(flags&IFA_F_TENTATIVE))
2658 ipv6_ifa_notify(0, ifp);
2660 spin_unlock_bh(&ifp->lock);
2662 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2671 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
2673 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2675 struct prefix_info *pinfo;
2680 struct inet6_dev *in6_dev;
2681 struct net *net = dev_net(dev);
2683 pinfo = (struct prefix_info *) opt;
2685 if (len < sizeof(struct prefix_info)) {
2686 netdev_dbg(dev, "addrconf: prefix option too short\n");
2691 * Validation checks ([ADDRCONF], page 19)
2694 addr_type = ipv6_addr_type(&pinfo->prefix);
2696 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2699 valid_lft = ntohl(pinfo->valid);
2700 prefered_lft = ntohl(pinfo->prefered);
2702 if (prefered_lft > valid_lft) {
2703 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2707 in6_dev = in6_dev_get(dev);
2710 net_dbg_ratelimited("addrconf: device %s not configured\n",
2716 * Two things going on here:
2717 * 1) Add routes for on-link prefixes
2718 * 2) Configure prefixes with the auto flag set
2721 if (pinfo->onlink) {
2722 struct fib6_info *rt;
2723 unsigned long rt_expires;
2725 /* Avoid arithmetic overflow. Really, we could
2726 * save rt_expires in seconds, likely valid_lft,
2727 * but it would require division in fib gc, that it
2731 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2733 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2735 if (addrconf_finite_timeout(rt_expires))
2738 rt = addrconf_get_prefix_route(&pinfo->prefix,
2741 RTF_ADDRCONF | RTF_PREFIX_RT,
2745 /* Autoconf prefix route */
2746 if (valid_lft == 0) {
2747 ip6_del_rt(net, rt, false);
2749 } else if (addrconf_finite_timeout(rt_expires)) {
2751 fib6_set_expires(rt, jiffies + rt_expires);
2753 fib6_clean_expires(rt);
2755 } else if (valid_lft) {
2756 clock_t expires = 0;
2757 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2758 if (addrconf_finite_timeout(rt_expires)) {
2760 flags |= RTF_EXPIRES;
2761 expires = jiffies_to_clock_t(rt_expires);
2763 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2764 0, dev, expires, flags,
2767 fib6_info_release(rt);
2770 /* Try to figure out our local address for this prefix */
2772 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2773 struct in6_addr addr;
2774 bool tokenized = false, dev_addr_generated = false;
2776 if (pinfo->prefix_len == 64) {
2777 memcpy(&addr, &pinfo->prefix, 8);
2779 if (!ipv6_addr_any(&in6_dev->token)) {
2780 read_lock_bh(&in6_dev->lock);
2781 memcpy(addr.s6_addr + 8,
2782 in6_dev->token.s6_addr + 8, 8);
2783 read_unlock_bh(&in6_dev->lock);
2785 } else if (is_addr_mode_generate_stable(in6_dev) &&
2786 !ipv6_generate_stable_address(&addr, 0,
2788 addr_flags |= IFA_F_STABLE_PRIVACY;
2790 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2791 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2794 dev_addr_generated = true;
2798 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2803 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2806 tokenized, valid_lft,
2811 /* Ignore error case here because previous prefix add addr was
2812 * successful which will be notified.
2814 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2815 addr_type, addr_flags, sllao,
2816 tokenized, valid_lft,
2818 dev_addr_generated);
2820 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2822 in6_dev_put(in6_dev);
2825 static int addrconf_set_sit_dstaddr(struct net *net, struct net_device *dev,
2826 struct in6_ifreq *ireq)
2828 struct ip_tunnel_parm p = { };
2831 if (!(ipv6_addr_type(&ireq->ifr6_addr) & IPV6_ADDR_COMPATv4))
2832 return -EADDRNOTAVAIL;
2834 p.iph.daddr = ireq->ifr6_addr.s6_addr32[3];
2837 p.iph.protocol = IPPROTO_IPV6;
2840 if (!dev->netdev_ops->ndo_tunnel_ctl)
2842 err = dev->netdev_ops->ndo_tunnel_ctl(dev, &p, SIOCADDTUNNEL);
2846 dev = __dev_get_by_name(net, p.name);
2849 return dev_open(dev, NULL);
2853 * Set destination address.
2854 * Special case for SIT interfaces where we create a new "virtual"
2857 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2859 struct net_device *dev;
2860 struct in6_ifreq ireq;
2863 if (!IS_ENABLED(CONFIG_IPV6_SIT))
2865 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2869 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2870 if (dev && dev->type == ARPHRD_SIT)
2871 err = addrconf_set_sit_dstaddr(net, dev, &ireq);
2876 static int ipv6_mc_config(struct sock *sk, bool join,
2877 const struct in6_addr *addr, int ifindex)
2885 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2887 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2894 * Manual configuration of address on an interface
2896 static int inet6_addr_add(struct net *net, int ifindex,
2897 struct ifa6_config *cfg,
2898 struct netlink_ext_ack *extack)
2900 struct inet6_ifaddr *ifp;
2901 struct inet6_dev *idev;
2902 struct net_device *dev;
2903 unsigned long timeout;
2909 if (cfg->plen > 128)
2912 /* check the lifetime */
2913 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
2916 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64)
2919 dev = __dev_get_by_index(net, ifindex);
2923 idev = addrconf_add_dev(dev);
2925 return PTR_ERR(idev);
2927 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
2928 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2929 true, cfg->pfx, ifindex);
2935 cfg->scope = ipv6_addr_scope(cfg->pfx);
2937 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
2938 if (addrconf_finite_timeout(timeout)) {
2939 expires = jiffies_to_clock_t(timeout * HZ);
2940 cfg->valid_lft = timeout;
2941 flags = RTF_EXPIRES;
2945 cfg->ifa_flags |= IFA_F_PERMANENT;
2948 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
2949 if (addrconf_finite_timeout(timeout)) {
2951 cfg->ifa_flags |= IFA_F_DEPRECATED;
2952 cfg->preferred_lft = timeout;
2955 ifp = ipv6_add_addr(idev, cfg, true, extack);
2957 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
2958 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
2959 ifp->rt_priority, dev, expires,
2963 /* Send a netlink notification if DAD is enabled and
2964 * optimistic flag is not set
2966 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD)))
2967 ipv6_ifa_notify(0, ifp);
2969 * Note that section 3.1 of RFC 4429 indicates
2970 * that the Optimistic flag should not be set for
2971 * manually configured addresses
2973 addrconf_dad_start(ifp);
2974 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR)
2975 manage_tempaddrs(idev, ifp, cfg->valid_lft,
2976 cfg->preferred_lft, true, jiffies);
2978 addrconf_verify_rtnl();
2980 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
2981 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false,
2985 return PTR_ERR(ifp);
2988 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2989 const struct in6_addr *pfx, unsigned int plen)
2991 struct inet6_ifaddr *ifp;
2992 struct inet6_dev *idev;
2993 struct net_device *dev;
2998 dev = __dev_get_by_index(net, ifindex);
3002 idev = __in6_dev_get(dev);
3006 read_lock_bh(&idev->lock);
3007 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3008 if (ifp->prefix_len == plen &&
3009 ipv6_addr_equal(pfx, &ifp->addr)) {
3011 read_unlock_bh(&idev->lock);
3013 if (!(ifp->flags & IFA_F_TEMPORARY) &&
3014 (ifa_flags & IFA_F_MANAGETEMPADDR))
3015 manage_tempaddrs(idev, ifp, 0, 0, false,
3018 addrconf_verify_rtnl();
3019 if (ipv6_addr_is_multicast(pfx)) {
3020 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
3021 false, pfx, dev->ifindex);
3026 read_unlock_bh(&idev->lock);
3027 return -EADDRNOTAVAIL;
3031 int addrconf_add_ifaddr(struct net *net, void __user *arg)
3033 struct ifa6_config cfg = {
3034 .ifa_flags = IFA_F_PERMANENT,
3035 .preferred_lft = INFINITY_LIFE_TIME,
3036 .valid_lft = INFINITY_LIFE_TIME,
3038 struct in6_ifreq ireq;
3041 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3044 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3047 cfg.pfx = &ireq.ifr6_addr;
3048 cfg.plen = ireq.ifr6_prefixlen;
3051 err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL);
3056 int addrconf_del_ifaddr(struct net *net, void __user *arg)
3058 struct in6_ifreq ireq;
3061 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3064 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3068 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
3069 ireq.ifr6_prefixlen);
3074 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
3075 int plen, int scope)
3077 struct inet6_ifaddr *ifp;
3078 struct ifa6_config cfg = {
3081 .ifa_flags = IFA_F_PERMANENT,
3082 .valid_lft = INFINITY_LIFE_TIME,
3083 .preferred_lft = INFINITY_LIFE_TIME,
3087 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
3089 spin_lock_bh(&ifp->lock);
3090 ifp->flags &= ~IFA_F_TENTATIVE;
3091 spin_unlock_bh(&ifp->lock);
3092 rt_genid_bump_ipv6(dev_net(idev->dev));
3093 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3098 #if IS_ENABLED(CONFIG_IPV6_SIT)
3099 static void sit_add_v4_addrs(struct inet6_dev *idev)
3101 struct in6_addr addr;
3102 struct net_device *dev;
3103 struct net *net = dev_net(idev->dev);
3109 memset(&addr, 0, sizeof(struct in6_addr));
3110 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
3112 if (idev->dev->flags&IFF_POINTOPOINT) {
3113 addr.s6_addr32[0] = htonl(0xfe800000);
3117 scope = IPV6_ADDR_COMPATv4;
3119 pflags |= RTF_NONEXTHOP;
3122 if (addr.s6_addr32[3]) {
3123 add_addr(idev, &addr, plen, scope);
3124 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags,
3129 for_each_netdev(net, dev) {
3130 struct in_device *in_dev = __in_dev_get_rtnl(dev);
3131 if (in_dev && (dev->flags & IFF_UP)) {
3132 struct in_ifaddr *ifa;
3135 in_dev_for_each_ifa_rtnl(ifa, in_dev) {
3136 addr.s6_addr32[3] = ifa->ifa_local;
3138 if (ifa->ifa_scope == RT_SCOPE_LINK)
3140 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
3141 if (idev->dev->flags&IFF_POINTOPOINT)
3146 add_addr(idev, &addr, plen, flag);
3147 addrconf_prefix_route(&addr, plen, 0, idev->dev,
3148 0, pflags, GFP_KERNEL);
3155 static void init_loopback(struct net_device *dev)
3157 struct inet6_dev *idev;
3163 idev = ipv6_find_idev(dev);
3165 pr_debug("%s: add_dev failed\n", __func__);
3169 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
3172 void addrconf_add_linklocal(struct inet6_dev *idev,
3173 const struct in6_addr *addr, u32 flags)
3175 struct ifa6_config cfg = {
3178 .ifa_flags = flags | IFA_F_PERMANENT,
3179 .valid_lft = INFINITY_LIFE_TIME,
3180 .preferred_lft = INFINITY_LIFE_TIME,
3183 struct inet6_ifaddr *ifp;
3185 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3186 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad ||
3187 idev->cnf.optimistic_dad) &&
3188 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
3189 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
3192 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
3194 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev,
3196 addrconf_dad_start(ifp);
3200 EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
3202 static bool ipv6_reserved_interfaceid(struct in6_addr address)
3204 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3207 if (address.s6_addr32[2] == htonl(0x02005eff) &&
3208 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3211 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3212 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3218 static int ipv6_generate_stable_address(struct in6_addr *address,
3220 const struct inet6_dev *idev)
3222 static DEFINE_SPINLOCK(lock);
3223 static __u32 digest[SHA1_DIGEST_WORDS];
3224 static __u32 workspace[SHA1_WORKSPACE_WORDS];
3227 char __data[SHA1_BLOCK_SIZE];
3229 struct in6_addr secret;
3231 unsigned char hwaddr[MAX_ADDR_LEN];
3236 struct in6_addr secret;
3237 struct in6_addr temp;
3238 struct net *net = dev_net(idev->dev);
3240 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3242 if (idev->cnf.stable_secret.initialized)
3243 secret = idev->cnf.stable_secret.secret;
3244 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3245 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3250 spin_lock_bh(&lock);
3253 memset(&data, 0, sizeof(data));
3254 memset(workspace, 0, sizeof(workspace));
3255 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3256 data.prefix[0] = address->s6_addr32[0];
3257 data.prefix[1] = address->s6_addr32[1];
3258 data.secret = secret;
3259 data.dad_count = dad_count;
3261 sha1_transform(digest, data.__data, workspace);
3264 temp.s6_addr32[2] = (__force __be32)digest[0];
3265 temp.s6_addr32[3] = (__force __be32)digest[1];
3267 spin_unlock_bh(&lock);
3269 if (ipv6_reserved_interfaceid(temp)) {
3271 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3280 static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3282 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3286 s = &idev->cnf.stable_secret;
3287 get_random_bytes(&s->secret, sizeof(s->secret));
3288 s->initialized = true;
3291 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3293 struct in6_addr addr;
3295 /* no link local addresses on L3 master devices */
3296 if (netif_is_l3_master(idev->dev))
3299 /* no link local addresses on devices flagged as slaves */
3300 if (idev->dev->flags & IFF_SLAVE)
3303 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3305 switch (idev->cnf.addr_gen_mode) {
3306 case IN6_ADDR_GEN_MODE_RANDOM:
3307 ipv6_gen_mode_random_init(idev);
3309 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
3310 if (!ipv6_generate_stable_address(&addr, 0, idev))
3311 addrconf_add_linklocal(idev, &addr,
3312 IFA_F_STABLE_PRIVACY);
3313 else if (prefix_route)
3314 addrconf_prefix_route(&addr, 64, 0, idev->dev,
3317 case IN6_ADDR_GEN_MODE_EUI64:
3318 /* addrconf_add_linklocal also adds a prefix_route and we
3319 * only need to care about prefix routes if ipv6_generate_eui64
3320 * couldn't generate one.
3322 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3323 addrconf_add_linklocal(idev, &addr, 0);
3324 else if (prefix_route)
3325 addrconf_prefix_route(&addr, 64, 0, idev->dev,
3328 case IN6_ADDR_GEN_MODE_NONE:
3330 /* will not add any link local address */
3335 static void addrconf_dev_config(struct net_device *dev)
3337 struct inet6_dev *idev;
3341 if ((dev->type != ARPHRD_ETHER) &&
3342 (dev->type != ARPHRD_FDDI) &&
3343 (dev->type != ARPHRD_ARCNET) &&
3344 (dev->type != ARPHRD_INFINIBAND) &&
3345 (dev->type != ARPHRD_IEEE1394) &&
3346 (dev->type != ARPHRD_TUNNEL6) &&
3347 (dev->type != ARPHRD_6LOWPAN) &&
3348 (dev->type != ARPHRD_IP6GRE) &&
3349 (dev->type != ARPHRD_IPGRE) &&
3350 (dev->type != ARPHRD_TUNNEL) &&
3351 (dev->type != ARPHRD_NONE) &&
3352 (dev->type != ARPHRD_RAWIP)) {
3353 /* Alas, we support only Ethernet autoconfiguration. */
3354 idev = __in6_dev_get(dev);
3355 if (!IS_ERR_OR_NULL(idev) && dev->flags & IFF_UP &&
3356 dev->flags & IFF_MULTICAST)
3361 idev = addrconf_add_dev(dev);
3365 /* this device type has no EUI support */
3366 if (dev->type == ARPHRD_NONE &&
3367 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3368 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
3370 addrconf_addr_gen(idev, false);
3373 #if IS_ENABLED(CONFIG_IPV6_SIT)
3374 static void addrconf_sit_config(struct net_device *dev)
3376 struct inet6_dev *idev;
3381 * Configure the tunnel with one of our IPv4
3382 * addresses... we should configure all of
3383 * our v4 addrs in the tunnel
3386 idev = ipv6_find_idev(dev);
3388 pr_debug("%s: add_dev failed\n", __func__);
3392 if (dev->priv_flags & IFF_ISATAP) {
3393 addrconf_addr_gen(idev, false);
3397 sit_add_v4_addrs(idev);
3399 if (dev->flags&IFF_POINTOPOINT)
3400 addrconf_add_mroute(dev);
3404 #if IS_ENABLED(CONFIG_NET_IPGRE)
3405 static void addrconf_gre_config(struct net_device *dev)
3407 struct inet6_dev *idev;
3411 idev = ipv6_find_idev(dev);
3413 pr_debug("%s: add_dev failed\n", __func__);
3417 addrconf_addr_gen(idev, true);
3418 if (dev->flags & IFF_POINTOPOINT)
3419 addrconf_add_mroute(dev);
3423 static int fixup_permanent_addr(struct net *net,
3424 struct inet6_dev *idev,
3425 struct inet6_ifaddr *ifp)
3427 /* !fib6_node means the host route was removed from the
3428 * FIB, for example, if 'lo' device is taken down. In that
3429 * case regenerate the host route.
3431 if (!ifp->rt || !ifp->rt->fib6_node) {
3432 struct fib6_info *f6i, *prev;
3434 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false,
3437 return PTR_ERR(f6i);
3439 /* ifp->rt can be accessed outside of rtnl */
3440 spin_lock(&ifp->lock);
3443 spin_unlock(&ifp->lock);
3445 fib6_info_release(prev);
3448 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3449 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3450 ifp->rt_priority, idev->dev, 0, 0,
3454 if (ifp->state == INET6_IFADDR_STATE_PREDAD)
3455 addrconf_dad_start(ifp);
3460 static void addrconf_permanent_addr(struct net *net, struct net_device *dev)
3462 struct inet6_ifaddr *ifp, *tmp;
3463 struct inet6_dev *idev;
3465 idev = __in6_dev_get(dev);
3469 write_lock_bh(&idev->lock);
3471 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3472 if ((ifp->flags & IFA_F_PERMANENT) &&
3473 fixup_permanent_addr(net, idev, ifp) < 0) {
3474 write_unlock_bh(&idev->lock);
3477 write_lock_bh(&idev->lock);
3479 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3480 idev->dev->name, &ifp->addr);
3484 write_unlock_bh(&idev->lock);
3487 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3490 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3491 struct netdev_notifier_change_info *change_info;
3492 struct netdev_notifier_changeupper_info *info;
3493 struct inet6_dev *idev = __in6_dev_get(dev);
3494 struct net *net = dev_net(dev);
3495 int run_pending = 0;
3499 case NETDEV_REGISTER:
3500 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3501 idev = ipv6_add_dev(dev);
3503 return notifier_from_errno(PTR_ERR(idev));
3507 case NETDEV_CHANGEMTU:
3508 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3509 if (dev->mtu < IPV6_MIN_MTU) {
3510 addrconf_ifdown(dev, dev != net->loopback_dev);
3515 rt6_mtu_change(dev, dev->mtu);
3516 idev->cnf.mtu6 = dev->mtu;
3520 /* allocate new idev */
3521 idev = ipv6_add_dev(dev);
3525 /* device is still not ready */
3526 if (!(idev->if_flags & IF_READY))
3533 if (dev->flags & IFF_SLAVE)
3536 if (idev && idev->cnf.disable_ipv6)
3539 if (event == NETDEV_UP) {
3540 /* restore routes for permanent addresses */
3541 addrconf_permanent_addr(net, dev);
3543 if (!addrconf_link_ready(dev)) {
3544 /* device is not ready yet. */
3545 pr_debug("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3550 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3551 idev = ipv6_add_dev(dev);
3553 if (!IS_ERR_OR_NULL(idev)) {
3554 idev->if_flags |= IF_READY;
3557 } else if (event == NETDEV_CHANGE) {
3558 if (!addrconf_link_ready(dev)) {
3559 /* device is still not ready. */
3560 rt6_sync_down_dev(dev, event);
3564 if (!IS_ERR_OR_NULL(idev)) {
3565 if (idev->if_flags & IF_READY) {
3566 /* device is already configured -
3567 * but resend MLD reports, we might
3568 * have roamed and need to update
3569 * multicast snooping switches
3573 if (change_info->flags_changed & IFF_NOARP)
3574 addrconf_dad_run(idev, true);
3575 rt6_sync_up(dev, RTNH_F_LINKDOWN);
3578 idev->if_flags |= IF_READY;
3581 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3587 switch (dev->type) {
3588 #if IS_ENABLED(CONFIG_IPV6_SIT)
3590 addrconf_sit_config(dev);
3593 #if IS_ENABLED(CONFIG_NET_IPGRE)
3595 addrconf_gre_config(dev);
3598 case ARPHRD_LOOPBACK:
3603 addrconf_dev_config(dev);
3607 if (!IS_ERR_OR_NULL(idev)) {
3609 addrconf_dad_run(idev, false);
3611 /* Device has an address by now */
3612 rt6_sync_up(dev, RTNH_F_DEAD);
3615 * If the MTU changed during the interface down,
3616 * when the interface up, the changed MTU must be
3617 * reflected in the idev as well as routers.
3619 if (idev->cnf.mtu6 != dev->mtu &&
3620 dev->mtu >= IPV6_MIN_MTU) {
3621 rt6_mtu_change(dev, dev->mtu);
3622 idev->cnf.mtu6 = dev->mtu;
3624 idev->tstamp = jiffies;
3625 inet6_ifinfo_notify(RTM_NEWLINK, idev);
3628 * If the changed mtu during down is lower than
3629 * IPV6_MIN_MTU stop IPv6 on this interface.
3631 if (dev->mtu < IPV6_MIN_MTU)
3632 addrconf_ifdown(dev, dev != net->loopback_dev);
3637 case NETDEV_UNREGISTER:
3639 * Remove all addresses from this interface.
3641 addrconf_ifdown(dev, event != NETDEV_DOWN);
3644 case NETDEV_CHANGENAME:
3646 snmp6_unregister_dev(idev);
3647 addrconf_sysctl_unregister(idev);
3648 err = addrconf_sysctl_register(idev);
3650 return notifier_from_errno(err);
3651 err = snmp6_register_dev(idev);
3653 addrconf_sysctl_unregister(idev);
3654 return notifier_from_errno(err);
3659 case NETDEV_PRE_TYPE_CHANGE:
3660 case NETDEV_POST_TYPE_CHANGE:
3662 addrconf_type_change(dev, event);
3665 case NETDEV_CHANGEUPPER:
3668 /* flush all routes if dev is linked to or unlinked from
3669 * an L3 master device (e.g., VRF)
3671 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3672 addrconf_ifdown(dev, false);
3679 * addrconf module should be notified of a device going up
3681 static struct notifier_block ipv6_dev_notf = {
3682 .notifier_call = addrconf_notify,
3683 .priority = ADDRCONF_NOTIFY_PRIORITY,
3686 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3688 struct inet6_dev *idev;
3691 idev = __in6_dev_get(dev);
3693 if (event == NETDEV_POST_TYPE_CHANGE)
3694 ipv6_mc_remap(idev);
3695 else if (event == NETDEV_PRE_TYPE_CHANGE)
3696 ipv6_mc_unmap(idev);
3699 static bool addr_is_local(const struct in6_addr *addr)
3701 return ipv6_addr_type(addr) &
3702 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3705 static int addrconf_ifdown(struct net_device *dev, bool unregister)
3707 unsigned long event = unregister ? NETDEV_UNREGISTER : NETDEV_DOWN;
3708 struct net *net = dev_net(dev);
3709 struct inet6_dev *idev;
3710 struct inet6_ifaddr *ifa, *tmp;
3711 bool keep_addr = false;
3716 rt6_disable_ip(dev, event);
3718 idev = __in6_dev_get(dev);
3723 * Step 1: remove reference to ipv6 device from parent device.
3729 /* protected by rtnl_lock */
3730 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3732 /* Step 1.5: remove snmp6 entry */
3733 snmp6_unregister_dev(idev);
3737 /* combine the user config with event to determine if permanent
3738 * addresses are to be removed from address hash table
3740 if (!unregister && !idev->cnf.disable_ipv6) {
3741 /* aggregate the system setting and interface setting */
3742 int _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3745 _keep_addr = idev->cnf.keep_addr_on_down;
3747 keep_addr = (_keep_addr > 0);
3750 /* Step 2: clear hash table */
3751 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3752 struct hlist_head *h = &inet6_addr_lst[i];
3754 spin_lock_bh(&addrconf_hash_lock);
3756 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3757 if (ifa->idev == idev) {
3758 addrconf_del_dad_work(ifa);
3759 /* combined flag + permanent flag decide if
3760 * address is retained on a down event
3763 !(ifa->flags & IFA_F_PERMANENT) ||
3764 addr_is_local(&ifa->addr)) {
3765 hlist_del_init_rcu(&ifa->addr_lst);
3770 spin_unlock_bh(&addrconf_hash_lock);
3773 write_lock_bh(&idev->lock);
3775 addrconf_del_rs_timer(idev);
3777 /* Step 2: clear flags for stateless addrconf */
3779 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3781 /* Step 3: clear tempaddr list */
3782 while (!list_empty(&idev->tempaddr_list)) {
3783 ifa = list_first_entry(&idev->tempaddr_list,
3784 struct inet6_ifaddr, tmp_list);
3785 list_del(&ifa->tmp_list);
3786 write_unlock_bh(&idev->lock);
3787 spin_lock_bh(&ifa->lock);
3790 in6_ifa_put(ifa->ifpub);
3793 spin_unlock_bh(&ifa->lock);
3795 write_lock_bh(&idev->lock);
3798 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
3799 struct fib6_info *rt = NULL;
3802 addrconf_del_dad_work(ifa);
3804 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3805 !addr_is_local(&ifa->addr);
3807 write_unlock_bh(&idev->lock);
3808 spin_lock_bh(&ifa->lock);
3811 /* set state to skip the notifier below */
3812 state = INET6_IFADDR_STATE_DEAD;
3813 ifa->state = INET6_IFADDR_STATE_PREDAD;
3814 if (!(ifa->flags & IFA_F_NODAD))
3815 ifa->flags |= IFA_F_TENTATIVE;
3821 ifa->state = INET6_IFADDR_STATE_DEAD;
3824 spin_unlock_bh(&ifa->lock);
3827 ip6_del_rt(net, rt, false);
3829 if (state != INET6_IFADDR_STATE_DEAD) {
3830 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3831 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3833 if (idev->cnf.forwarding)
3834 addrconf_leave_anycast(ifa);
3835 addrconf_leave_solict(ifa->idev, &ifa->addr);
3838 write_lock_bh(&idev->lock);
3840 list_del_rcu(&ifa->if_list);
3845 write_unlock_bh(&idev->lock);
3847 /* Step 5: Discard anycast and multicast list */
3849 ipv6_ac_destroy_dev(idev);
3850 ipv6_mc_destroy_dev(idev);
3855 idev->tstamp = jiffies;
3857 /* Last: Shot the device (if unregistered) */
3859 addrconf_sysctl_unregister(idev);
3860 neigh_parms_release(&nd_tbl, idev->nd_parms);
3861 neigh_ifdown(&nd_tbl, dev);
3867 static void addrconf_rs_timer(struct timer_list *t)
3869 struct inet6_dev *idev = from_timer(idev, t, rs_timer);
3870 struct net_device *dev = idev->dev;
3871 struct in6_addr lladdr;
3873 write_lock(&idev->lock);
3874 if (idev->dead || !(idev->if_flags & IF_READY))
3877 if (!ipv6_accept_ra(idev))
3880 /* Announcement received after solicitation was sent */
3881 if (idev->if_flags & IF_RA_RCVD)
3884 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
3885 write_unlock(&idev->lock);
3886 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3887 ndisc_send_rs(dev, &lladdr,
3888 &in6addr_linklocal_allrouters);
3892 write_lock(&idev->lock);
3893 idev->rs_interval = rfc3315_s14_backoff_update(
3894 idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
3895 /* The wait after the last probe can be shorter */
3896 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3897 idev->cnf.rtr_solicits) ?
3898 idev->cnf.rtr_solicit_delay :
3902 * Note: we do not support deprecated "all on-link"
3903 * assumption any longer.
3905 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3909 write_unlock(&idev->lock);
3915 * Duplicate Address Detection
3917 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3919 unsigned long rand_num;
3920 struct inet6_dev *idev = ifp->idev;
3923 if (ifp->flags & IFA_F_OPTIMISTIC)
3926 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3929 if (idev->cnf.enhanced_dad ||
3930 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) {
3932 get_random_bytes(&nonce, 6);
3935 ifp->dad_nonce = nonce;
3936 ifp->dad_probes = idev->cnf.dad_transmits;
3937 addrconf_mod_dad_work(ifp, rand_num);
3940 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3942 struct inet6_dev *idev = ifp->idev;
3943 struct net_device *dev = idev->dev;
3944 bool bump_id, notify = false;
3947 addrconf_join_solict(dev, &ifp->addr);
3949 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3951 read_lock_bh(&idev->lock);
3952 spin_lock(&ifp->lock);
3953 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3957 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3958 (net->ipv6.devconf_all->accept_dad < 1 &&
3959 idev->cnf.accept_dad < 1) ||
3960 !(ifp->flags&IFA_F_TENTATIVE) ||
3961 ifp->flags & IFA_F_NODAD) {
3962 bool send_na = false;
3964 if (ifp->flags & IFA_F_TENTATIVE &&
3965 !(ifp->flags & IFA_F_OPTIMISTIC))
3967 bump_id = ifp->flags & IFA_F_TENTATIVE;
3968 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3969 spin_unlock(&ifp->lock);
3970 read_unlock_bh(&idev->lock);
3972 addrconf_dad_completed(ifp, bump_id, send_na);
3976 if (!(idev->if_flags & IF_READY)) {
3977 spin_unlock(&ifp->lock);
3978 read_unlock_bh(&idev->lock);
3980 * If the device is not ready:
3981 * - keep it tentative if it is a permanent address.
3982 * - otherwise, kill it.
3985 addrconf_dad_stop(ifp, 0);
3990 * Optimistic nodes can start receiving
3993 if (ifp->flags & IFA_F_OPTIMISTIC) {
3994 ip6_ins_rt(net, ifp->rt);
3995 if (ipv6_use_optimistic_addr(net, idev)) {
3996 /* Because optimistic nodes can use this address,
3997 * notify listeners. If DAD fails, RTM_DELADDR is sent.
4003 addrconf_dad_kick(ifp);
4005 spin_unlock(&ifp->lock);
4006 read_unlock_bh(&idev->lock);
4008 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4011 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
4013 bool begin_dad = false;
4015 spin_lock_bh(&ifp->lock);
4016 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
4017 ifp->state = INET6_IFADDR_STATE_PREDAD;
4020 spin_unlock_bh(&ifp->lock);
4023 addrconf_mod_dad_work(ifp, 0);
4026 static void addrconf_dad_work(struct work_struct *w)
4028 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
4029 struct inet6_ifaddr,
4031 struct inet6_dev *idev = ifp->idev;
4032 bool bump_id, disable_ipv6 = false;
4033 struct in6_addr mcaddr;
4039 } action = DAD_PROCESS;
4043 spin_lock_bh(&ifp->lock);
4044 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
4046 ifp->state = INET6_IFADDR_STATE_DAD;
4047 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
4049 ifp->state = INET6_IFADDR_STATE_POSTDAD;
4051 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 ||
4052 idev->cnf.accept_dad > 1) &&
4053 !idev->cnf.disable_ipv6 &&
4054 !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
4055 struct in6_addr addr;
4057 addr.s6_addr32[0] = htonl(0xfe800000);
4058 addr.s6_addr32[1] = 0;
4060 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
4061 ipv6_addr_equal(&ifp->addr, &addr)) {
4062 /* DAD failed for link-local based on MAC */
4063 idev->cnf.disable_ipv6 = 1;
4065 pr_info("%s: IPv6 being disabled!\n",
4066 ifp->idev->dev->name);
4067 disable_ipv6 = true;
4071 spin_unlock_bh(&ifp->lock);
4073 if (action == DAD_BEGIN) {
4074 addrconf_dad_begin(ifp);
4076 } else if (action == DAD_ABORT) {
4078 addrconf_dad_stop(ifp, 1);
4080 addrconf_ifdown(idev->dev, false);
4084 if (!ifp->dad_probes && addrconf_dad_end(ifp))
4087 write_lock_bh(&idev->lock);
4088 if (idev->dead || !(idev->if_flags & IF_READY)) {
4089 write_unlock_bh(&idev->lock);
4093 spin_lock(&ifp->lock);
4094 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
4095 spin_unlock(&ifp->lock);
4096 write_unlock_bh(&idev->lock);
4100 if (ifp->dad_probes == 0) {
4101 bool send_na = false;
4104 * DAD was successful
4107 if (ifp->flags & IFA_F_TENTATIVE &&
4108 !(ifp->flags & IFA_F_OPTIMISTIC))
4110 bump_id = ifp->flags & IFA_F_TENTATIVE;
4111 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
4112 spin_unlock(&ifp->lock);
4113 write_unlock_bh(&idev->lock);
4115 addrconf_dad_completed(ifp, bump_id, send_na);
4121 addrconf_mod_dad_work(ifp,
4122 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME),
4124 spin_unlock(&ifp->lock);
4125 write_unlock_bh(&idev->lock);
4127 /* send a neighbour solicitation for our addr */
4128 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
4129 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
4136 /* ifp->idev must be at least read locked */
4137 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
4139 struct inet6_ifaddr *ifpiter;
4140 struct inet6_dev *idev = ifp->idev;
4142 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
4143 if (ifpiter->scope > IFA_LINK)
4145 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
4146 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
4147 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
4154 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
4157 struct net_device *dev = ifp->idev->dev;
4158 struct in6_addr lladdr;
4159 bool send_rs, send_mld;
4161 addrconf_del_dad_work(ifp);
4164 * Configure the address for reception. Now it is valid.
4167 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4169 /* If added prefix is link local and we are prepared to process
4170 router advertisements, start sending router solicitations.
4173 read_lock_bh(&ifp->idev->lock);
4174 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
4175 send_rs = send_mld &&
4176 ipv6_accept_ra(ifp->idev) &&
4177 ifp->idev->cnf.rtr_solicits != 0 &&
4178 (dev->flags&IFF_LOOPBACK) == 0;
4179 read_unlock_bh(&ifp->idev->lock);
4181 /* While dad is in progress mld report's source address is in6_addrany.
4182 * Resend with proper ll now.
4185 ipv6_mc_dad_complete(ifp->idev);
4187 /* send unsolicited NA if enabled */
4189 (ifp->idev->cnf.ndisc_notify ||
4190 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) {
4191 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr,
4192 /*router=*/ !!ifp->idev->cnf.forwarding,
4193 /*solicited=*/ false, /*override=*/ true,
4199 * If a host as already performed a random delay
4200 * [...] as part of DAD [...] there is no need
4201 * to delay again before sending the first RS
4203 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
4205 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
4207 write_lock_bh(&ifp->idev->lock);
4208 spin_lock(&ifp->lock);
4209 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4210 ifp->idev->cnf.rtr_solicit_interval);
4211 ifp->idev->rs_probes = 1;
4212 ifp->idev->if_flags |= IF_RS_SENT;
4213 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
4214 spin_unlock(&ifp->lock);
4215 write_unlock_bh(&ifp->idev->lock);
4219 rt_genid_bump_ipv6(dev_net(dev));
4221 /* Make sure that a new temporary address will be created
4222 * before this temporary address becomes deprecated.
4224 if (ifp->flags & IFA_F_TEMPORARY)
4225 addrconf_verify_rtnl();
4228 static void addrconf_dad_run(struct inet6_dev *idev, bool restart)
4230 struct inet6_ifaddr *ifp;
4232 read_lock_bh(&idev->lock);
4233 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4234 spin_lock(&ifp->lock);
4235 if ((ifp->flags & IFA_F_TENTATIVE &&
4236 ifp->state == INET6_IFADDR_STATE_DAD) || restart) {
4238 ifp->state = INET6_IFADDR_STATE_PREDAD;
4239 addrconf_dad_kick(ifp);
4241 spin_unlock(&ifp->lock);
4243 read_unlock_bh(&idev->lock);
4246 #ifdef CONFIG_PROC_FS
4247 struct if6_iter_state {
4248 struct seq_net_private p;
4253 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
4255 struct if6_iter_state *state = seq->private;
4256 struct net *net = seq_file_net(seq);
4257 struct inet6_ifaddr *ifa = NULL;
4260 /* initial bucket if pos is 0 */
4266 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
4267 hlist_for_each_entry_rcu(ifa, &inet6_addr_lst[state->bucket],
4269 if (!net_eq(dev_net(ifa->idev->dev), net))
4271 /* sync with offset */
4272 if (p < state->offset) {
4279 /* prepare for next bucket */
4286 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4287 struct inet6_ifaddr *ifa)
4289 struct if6_iter_state *state = seq->private;
4290 struct net *net = seq_file_net(seq);
4292 hlist_for_each_entry_continue_rcu(ifa, addr_lst) {
4293 if (!net_eq(dev_net(ifa->idev->dev), net))
4300 while (++state->bucket < IN6_ADDR_HSIZE) {
4301 hlist_for_each_entry_rcu(ifa,
4302 &inet6_addr_lst[state->bucket], addr_lst) {
4303 if (!net_eq(dev_net(ifa->idev->dev), net))
4312 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4316 return if6_get_first(seq, *pos);
4319 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4321 struct inet6_ifaddr *ifa;
4323 ifa = if6_get_next(seq, v);
4328 static void if6_seq_stop(struct seq_file *seq, void *v)
4334 static int if6_seq_show(struct seq_file *seq, void *v)
4336 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4337 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
4339 ifp->idev->dev->ifindex,
4343 ifp->idev->dev->name);
4347 static const struct seq_operations if6_seq_ops = {
4348 .start = if6_seq_start,
4349 .next = if6_seq_next,
4350 .show = if6_seq_show,
4351 .stop = if6_seq_stop,
4354 static int __net_init if6_proc_net_init(struct net *net)
4356 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops,
4357 sizeof(struct if6_iter_state)))
4362 static void __net_exit if6_proc_net_exit(struct net *net)
4364 remove_proc_entry("if_inet6", net->proc_net);
4367 static struct pernet_operations if6_proc_net_ops = {
4368 .init = if6_proc_net_init,
4369 .exit = if6_proc_net_exit,
4372 int __init if6_proc_init(void)
4374 return register_pernet_subsys(&if6_proc_net_ops);
4377 void if6_proc_exit(void)
4379 unregister_pernet_subsys(&if6_proc_net_ops);
4381 #endif /* CONFIG_PROC_FS */
4383 #if IS_ENABLED(CONFIG_IPV6_MIP6)
4384 /* Check if address is a home address configured on any interface. */
4385 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
4387 unsigned int hash = inet6_addr_hash(net, addr);
4388 struct inet6_ifaddr *ifp = NULL;
4392 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
4393 if (!net_eq(dev_net(ifp->idev->dev), net))
4395 if (ipv6_addr_equal(&ifp->addr, addr) &&
4396 (ifp->flags & IFA_F_HOMEADDRESS)) {
4406 /* RFC6554 has some algorithm to avoid loops in segment routing by
4407 * checking if the segments contains any of a local interface address.
4411 * To detect loops in the SRH, a router MUST determine if the SRH
4412 * includes multiple addresses assigned to any interface on that router.
4413 * If such addresses appear more than once and are separated by at least
4414 * one address not assigned to that router.
4416 int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs,
4417 unsigned char nsegs)
4419 const struct in6_addr *addr;
4420 int i, ret = 0, found = 0;
4421 struct inet6_ifaddr *ifp;
4422 bool separated = false;
4427 for (i = 0; i < nsegs; i++) {
4429 hash = inet6_addr_hash(net, addr);
4432 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
4433 if (!net_eq(dev_net(ifp->idev->dev), net))
4436 if (ipv6_addr_equal(&ifp->addr, addr)) {
4443 if (found > 1 && separated) {
4460 * Periodic address status verification
4463 static void addrconf_verify_rtnl(void)
4465 unsigned long now, next, next_sec, next_sched;
4466 struct inet6_ifaddr *ifp;
4473 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
4475 cancel_delayed_work(&addr_chk_work);
4477 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
4479 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
4482 /* When setting preferred_lft to a value not zero or
4483 * infinity, while valid_lft is infinity
4484 * IFA_F_PERMANENT has a non-infinity life time.
4486 if ((ifp->flags & IFA_F_PERMANENT) &&
4487 (ifp->prefered_lft == INFINITY_LIFE_TIME))
4490 spin_lock(&ifp->lock);
4491 /* We try to batch several events at once. */
4492 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
4494 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4495 age >= ifp->valid_lft) {
4496 spin_unlock(&ifp->lock);
4500 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4501 spin_unlock(&ifp->lock);
4503 } else if (age >= ifp->prefered_lft) {
4504 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
4507 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4509 ifp->flags |= IFA_F_DEPRECATED;
4512 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4513 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
4514 next = ifp->tstamp + ifp->valid_lft * HZ;
4516 spin_unlock(&ifp->lock);
4521 ipv6_ifa_notify(0, ifp);
4525 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4526 !(ifp->flags&IFA_F_TENTATIVE)) {
4527 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4528 ifp->idev->cnf.dad_transmits *
4529 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME), HZ/100) / HZ;
4531 if (age >= ifp->prefered_lft - regen_advance) {
4532 struct inet6_ifaddr *ifpub = ifp->ifpub;
4533 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4534 next = ifp->tstamp + ifp->prefered_lft * HZ;
4535 if (!ifp->regen_count && ifpub) {
4538 in6_ifa_hold(ifpub);
4539 spin_unlock(&ifp->lock);
4541 spin_lock(&ifpub->lock);
4542 ifpub->regen_count = 0;
4543 spin_unlock(&ifpub->lock);
4544 rcu_read_unlock_bh();
4545 ipv6_create_tempaddr(ifpub, true);
4551 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4552 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4553 spin_unlock(&ifp->lock);
4555 /* ifp->prefered_lft <= ifp->valid_lft */
4556 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4557 next = ifp->tstamp + ifp->prefered_lft * HZ;
4558 spin_unlock(&ifp->lock);
4563 next_sec = round_jiffies_up(next);
4566 /* If rounded timeout is accurate enough, accept it. */
4567 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4568 next_sched = next_sec;
4570 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4571 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4572 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4574 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4575 now, next, next_sec, next_sched);
4576 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
4577 rcu_read_unlock_bh();
4580 static void addrconf_verify_work(struct work_struct *w)
4583 addrconf_verify_rtnl();
4587 static void addrconf_verify(void)
4589 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4592 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4593 struct in6_addr **peer_pfx)
4595 struct in6_addr *pfx = NULL;
4600 pfx = nla_data(addr);
4603 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4605 pfx = nla_data(local);
4611 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4612 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4613 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4614 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
4615 [IFA_FLAGS] = { .len = sizeof(u32) },
4616 [IFA_RT_PRIORITY] = { .len = sizeof(u32) },
4617 [IFA_TARGET_NETNSID] = { .type = NLA_S32 },
4621 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
4622 struct netlink_ext_ack *extack)
4624 struct net *net = sock_net(skb->sk);
4625 struct ifaddrmsg *ifm;
4626 struct nlattr *tb[IFA_MAX+1];
4627 struct in6_addr *pfx, *peer_pfx;
4631 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4632 ifa_ipv6_policy, extack);
4636 ifm = nlmsg_data(nlh);
4637 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4641 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4643 /* We ignore other flags so far. */
4644 ifa_flags &= IFA_F_MANAGETEMPADDR;
4646 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4647 ifm->ifa_prefixlen);
4650 static int modify_prefix_route(struct inet6_ifaddr *ifp,
4651 unsigned long expires, u32 flags,
4654 struct fib6_info *f6i;
4657 f6i = addrconf_get_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
4659 ifp->idev->dev, 0, RTF_DEFAULT, true);
4663 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF;
4664 if (f6i->fib6_metric != prio) {
4665 /* delete old one */
4666 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false);
4669 addrconf_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
4671 ifp->rt_priority, ifp->idev->dev,
4672 expires, flags, GFP_KERNEL);
4675 fib6_clean_expires(f6i);
4677 fib6_set_expires(f6i, expires);
4679 fib6_info_release(f6i);
4685 static int inet6_addr_modify(struct inet6_ifaddr *ifp, struct ifa6_config *cfg)
4689 unsigned long timeout;
4690 bool was_managetempaddr;
4691 bool had_prefixroute;
4692 bool new_peer = false;
4696 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
4699 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR &&
4700 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4703 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED)
4704 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC;
4706 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
4707 if (addrconf_finite_timeout(timeout)) {
4708 expires = jiffies_to_clock_t(timeout * HZ);
4709 cfg->valid_lft = timeout;
4710 flags = RTF_EXPIRES;
4714 cfg->ifa_flags |= IFA_F_PERMANENT;
4717 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
4718 if (addrconf_finite_timeout(timeout)) {
4720 cfg->ifa_flags |= IFA_F_DEPRECATED;
4721 cfg->preferred_lft = timeout;
4724 if (cfg->peer_pfx &&
4725 memcmp(&ifp->peer_addr, cfg->peer_pfx, sizeof(struct in6_addr))) {
4726 if (!ipv6_addr_any(&ifp->peer_addr))
4727 cleanup_prefix_route(ifp, expires, true, true);
4731 spin_lock_bh(&ifp->lock);
4732 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4733 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4734 !(ifp->flags & IFA_F_NOPREFIXROUTE);
4735 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4736 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4737 IFA_F_NOPREFIXROUTE);
4738 ifp->flags |= cfg->ifa_flags;
4739 ifp->tstamp = jiffies;
4740 ifp->valid_lft = cfg->valid_lft;
4741 ifp->prefered_lft = cfg->preferred_lft;
4743 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority)
4744 ifp->rt_priority = cfg->rt_priority;
4747 ifp->peer_addr = *cfg->peer_pfx;
4749 spin_unlock_bh(&ifp->lock);
4750 if (!(ifp->flags&IFA_F_TENTATIVE))
4751 ipv6_ifa_notify(0, ifp);
4753 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
4756 if (had_prefixroute)
4757 rc = modify_prefix_route(ifp, expires, flags, false);
4759 /* prefix route could have been deleted; if so restore it */
4760 if (rc == -ENOENT) {
4761 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
4762 ifp->rt_priority, ifp->idev->dev,
4763 expires, flags, GFP_KERNEL);
4766 if (had_prefixroute && !ipv6_addr_any(&ifp->peer_addr))
4767 rc = modify_prefix_route(ifp, expires, flags, true);
4769 if (rc == -ENOENT && !ipv6_addr_any(&ifp->peer_addr)) {
4770 addrconf_prefix_route(&ifp->peer_addr, ifp->prefix_len,
4771 ifp->rt_priority, ifp->idev->dev,
4772 expires, flags, GFP_KERNEL);
4774 } else if (had_prefixroute) {
4775 enum cleanup_prefix_rt_t action;
4776 unsigned long rt_expires;
4778 write_lock_bh(&ifp->idev->lock);
4779 action = check_cleanup_prefix_route(ifp, &rt_expires);
4780 write_unlock_bh(&ifp->idev->lock);
4782 if (action != CLEANUP_PREFIX_RT_NOP) {
4783 cleanup_prefix_route(ifp, rt_expires,
4784 action == CLEANUP_PREFIX_RT_DEL, false);
4788 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4789 if (was_managetempaddr &&
4790 !(ifp->flags & IFA_F_MANAGETEMPADDR)) {
4792 cfg->preferred_lft = 0;
4794 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft,
4795 cfg->preferred_lft, !was_managetempaddr,
4799 addrconf_verify_rtnl();
4805 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
4806 struct netlink_ext_ack *extack)
4808 struct net *net = sock_net(skb->sk);
4809 struct ifaddrmsg *ifm;
4810 struct nlattr *tb[IFA_MAX+1];
4811 struct in6_addr *peer_pfx;
4812 struct inet6_ifaddr *ifa;
4813 struct net_device *dev;
4814 struct inet6_dev *idev;
4815 struct ifa6_config cfg;
4818 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4819 ifa_ipv6_policy, extack);
4823 memset(&cfg, 0, sizeof(cfg));
4825 ifm = nlmsg_data(nlh);
4826 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4830 cfg.peer_pfx = peer_pfx;
4831 cfg.plen = ifm->ifa_prefixlen;
4832 if (tb[IFA_RT_PRIORITY])
4833 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]);
4835 cfg.valid_lft = INFINITY_LIFE_TIME;
4836 cfg.preferred_lft = INFINITY_LIFE_TIME;
4838 if (tb[IFA_CACHEINFO]) {
4839 struct ifa_cacheinfo *ci;
4841 ci = nla_data(tb[IFA_CACHEINFO]);
4842 cfg.valid_lft = ci->ifa_valid;
4843 cfg.preferred_lft = ci->ifa_prefered;
4846 dev = __dev_get_by_index(net, ifm->ifa_index);
4851 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]);
4853 cfg.ifa_flags = ifm->ifa_flags;
4855 /* We ignore other flags so far. */
4856 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS |
4857 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE |
4858 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC;
4860 idev = ipv6_find_idev(dev);
4862 return PTR_ERR(idev);
4864 if (!ipv6_allow_optimistic_dad(net, idev))
4865 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC;
4867 if (cfg.ifa_flags & IFA_F_NODAD &&
4868 cfg.ifa_flags & IFA_F_OPTIMISTIC) {
4869 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive");
4873 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1);
4876 * It would be best to check for !NLM_F_CREATE here but
4877 * userspace already relies on not having to provide this.
4879 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack);
4882 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4883 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4886 err = inet6_addr_modify(ifa, &cfg);
4893 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4894 u8 scope, int ifindex)
4896 struct ifaddrmsg *ifm;
4898 ifm = nlmsg_data(nlh);
4899 ifm->ifa_family = AF_INET6;
4900 ifm->ifa_prefixlen = prefixlen;
4901 ifm->ifa_flags = flags;
4902 ifm->ifa_scope = scope;
4903 ifm->ifa_index = ifindex;
4906 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4907 unsigned long tstamp, u32 preferred, u32 valid)
4909 struct ifa_cacheinfo ci;
4911 ci.cstamp = cstamp_delta(cstamp);
4912 ci.tstamp = cstamp_delta(tstamp);
4913 ci.ifa_prefered = preferred;
4914 ci.ifa_valid = valid;
4916 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4919 static inline int rt_scope(int ifa_scope)
4921 if (ifa_scope & IFA_HOST)
4922 return RT_SCOPE_HOST;
4923 else if (ifa_scope & IFA_LINK)
4924 return RT_SCOPE_LINK;
4925 else if (ifa_scope & IFA_SITE)
4926 return RT_SCOPE_SITE;
4928 return RT_SCOPE_UNIVERSE;
4931 static inline int inet6_ifaddr_msgsize(void)
4933 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4934 + nla_total_size(16) /* IFA_LOCAL */
4935 + nla_total_size(16) /* IFA_ADDRESS */
4936 + nla_total_size(sizeof(struct ifa_cacheinfo))
4937 + nla_total_size(4) /* IFA_FLAGS */
4938 + nla_total_size(4) /* IFA_RT_PRIORITY */;
4947 struct inet6_fill_args {
4954 enum addr_type_t type;
4957 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
4958 struct inet6_fill_args *args)
4960 struct nlmsghdr *nlh;
4961 u32 preferred, valid;
4963 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
4964 sizeof(struct ifaddrmsg), args->flags);
4968 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4969 ifa->idev->dev->ifindex);
4971 if (args->netnsid >= 0 &&
4972 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
4975 if (!((ifa->flags&IFA_F_PERMANENT) &&
4976 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
4977 preferred = ifa->prefered_lft;
4978 valid = ifa->valid_lft;
4979 if (preferred != INFINITY_LIFE_TIME) {
4980 long tval = (jiffies - ifa->tstamp)/HZ;
4981 if (preferred > tval)
4985 if (valid != INFINITY_LIFE_TIME) {
4993 preferred = INFINITY_LIFE_TIME;
4994 valid = INFINITY_LIFE_TIME;
4997 if (!ipv6_addr_any(&ifa->peer_addr)) {
4998 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4999 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
5002 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
5005 if (ifa->rt_priority &&
5006 nla_put_u32(skb, IFA_RT_PRIORITY, ifa->rt_priority))
5009 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
5012 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
5015 nlmsg_end(skb, nlh);
5019 nlmsg_cancel(skb, nlh);
5023 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
5024 struct inet6_fill_args *args)
5026 struct nlmsghdr *nlh;
5027 u8 scope = RT_SCOPE_UNIVERSE;
5028 int ifindex = ifmca->idev->dev->ifindex;
5030 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
5031 scope = RT_SCOPE_SITE;
5033 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5034 sizeof(struct ifaddrmsg), args->flags);
5038 if (args->netnsid >= 0 &&
5039 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
5042 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
5043 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
5044 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
5045 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
5046 nlmsg_cancel(skb, nlh);
5050 nlmsg_end(skb, nlh);
5054 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
5055 struct inet6_fill_args *args)
5057 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt);
5058 int ifindex = dev ? dev->ifindex : 1;
5059 struct nlmsghdr *nlh;
5060 u8 scope = RT_SCOPE_UNIVERSE;
5062 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
5063 scope = RT_SCOPE_SITE;
5065 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5066 sizeof(struct ifaddrmsg), args->flags);
5070 if (args->netnsid >= 0 &&
5071 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
5074 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
5075 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
5076 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
5077 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
5078 nlmsg_cancel(skb, nlh);
5082 nlmsg_end(skb, nlh);
5086 /* called with rcu_read_lock() */
5087 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
5088 struct netlink_callback *cb, int s_ip_idx,
5089 struct inet6_fill_args *fillargs)
5091 struct ifmcaddr6 *ifmca;
5092 struct ifacaddr6 *ifaca;
5096 read_lock_bh(&idev->lock);
5097 switch (fillargs->type) {
5098 case UNICAST_ADDR: {
5099 struct inet6_ifaddr *ifa;
5100 fillargs->event = RTM_NEWADDR;
5102 /* unicast address incl. temp addr */
5103 list_for_each_entry(ifa, &idev->addr_list, if_list) {
5104 if (ip_idx < s_ip_idx)
5106 err = inet6_fill_ifaddr(skb, ifa, fillargs);
5109 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
5115 case MULTICAST_ADDR:
5116 fillargs->event = RTM_GETMULTICAST;
5118 /* multicast address */
5119 for (ifmca = idev->mc_list; ifmca;
5120 ifmca = ifmca->next, ip_idx++) {
5121 if (ip_idx < s_ip_idx)
5123 err = inet6_fill_ifmcaddr(skb, ifmca, fillargs);
5129 fillargs->event = RTM_GETANYCAST;
5130 /* anycast address */
5131 for (ifaca = idev->ac_list; ifaca;
5132 ifaca = ifaca->aca_next, ip_idx++) {
5133 if (ip_idx < s_ip_idx)
5135 err = inet6_fill_ifacaddr(skb, ifaca, fillargs);
5143 read_unlock_bh(&idev->lock);
5144 cb->args[2] = ip_idx;
5148 static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh,
5149 struct inet6_fill_args *fillargs,
5150 struct net **tgt_net, struct sock *sk,
5151 struct netlink_callback *cb)
5153 struct netlink_ext_ack *extack = cb->extack;
5154 struct nlattr *tb[IFA_MAX+1];
5155 struct ifaddrmsg *ifm;
5158 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5159 NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request");
5163 ifm = nlmsg_data(nlh);
5164 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5165 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request");
5169 fillargs->ifindex = ifm->ifa_index;
5170 if (fillargs->ifindex) {
5171 cb->answer_flags |= NLM_F_DUMP_FILTERED;
5172 fillargs->flags |= NLM_F_DUMP_FILTERED;
5175 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5176 ifa_ipv6_policy, extack);
5180 for (i = 0; i <= IFA_MAX; ++i) {
5184 if (i == IFA_TARGET_NETNSID) {
5187 fillargs->netnsid = nla_get_s32(tb[i]);
5188 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid);
5190 fillargs->netnsid = -1;
5191 NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id");
5192 return PTR_ERR(net);
5196 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request");
5204 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
5205 enum addr_type_t type)
5207 const struct nlmsghdr *nlh = cb->nlh;
5208 struct inet6_fill_args fillargs = {
5209 .portid = NETLINK_CB(cb->skb).portid,
5210 .seq = cb->nlh->nlmsg_seq,
5211 .flags = NLM_F_MULTI,
5215 struct net *net = sock_net(skb->sk);
5216 struct net *tgt_net = net;
5217 int idx, s_idx, s_ip_idx;
5219 struct net_device *dev;
5220 struct inet6_dev *idev;
5221 struct hlist_head *head;
5225 s_idx = idx = cb->args[1];
5226 s_ip_idx = cb->args[2];
5228 if (cb->strict_check) {
5229 err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net,
5235 if (fillargs.ifindex) {
5236 dev = __dev_get_by_index(tgt_net, fillargs.ifindex);
5241 idev = __in6_dev_get(dev);
5243 err = in6_dump_addrs(idev, skb, cb, s_ip_idx,
5253 cb->seq = atomic_read(&tgt_net->ipv6.dev_addr_genid) ^ tgt_net->dev_base_seq;
5254 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5256 head = &tgt_net->dev_index_head[h];
5257 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5260 if (h > s_h || idx > s_idx)
5262 idev = __in6_dev_get(dev);
5266 if (in6_dump_addrs(idev, skb, cb, s_ip_idx,
5278 if (fillargs.netnsid >= 0)
5281 return skb->len ? : err;
5284 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
5286 enum addr_type_t type = UNICAST_ADDR;
5288 return inet6_dump_addr(skb, cb, type);
5291 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
5293 enum addr_type_t type = MULTICAST_ADDR;
5295 return inet6_dump_addr(skb, cb, type);
5299 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
5301 enum addr_type_t type = ANYCAST_ADDR;
5303 return inet6_dump_addr(skb, cb, type);
5306 static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb,
5307 const struct nlmsghdr *nlh,
5309 struct netlink_ext_ack *extack)
5311 struct ifaddrmsg *ifm;
5314 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5315 NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request");
5319 if (!netlink_strict_get_check(skb))
5320 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
5321 ifa_ipv6_policy, extack);
5323 ifm = nlmsg_data(nlh);
5324 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5325 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request");
5329 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5330 ifa_ipv6_policy, extack);
5334 for (i = 0; i <= IFA_MAX; i++) {
5339 case IFA_TARGET_NETNSID:
5344 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request");
5352 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
5353 struct netlink_ext_ack *extack)
5355 struct net *net = sock_net(in_skb->sk);
5356 struct inet6_fill_args fillargs = {
5357 .portid = NETLINK_CB(in_skb).portid,
5358 .seq = nlh->nlmsg_seq,
5359 .event = RTM_NEWADDR,
5363 struct net *tgt_net = net;
5364 struct ifaddrmsg *ifm;
5365 struct nlattr *tb[IFA_MAX+1];
5366 struct in6_addr *addr = NULL, *peer;
5367 struct net_device *dev = NULL;
5368 struct inet6_ifaddr *ifa;
5369 struct sk_buff *skb;
5372 err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack);
5376 if (tb[IFA_TARGET_NETNSID]) {
5377 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]);
5379 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk,
5381 if (IS_ERR(tgt_net))
5382 return PTR_ERR(tgt_net);
5385 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
5389 ifm = nlmsg_data(nlh);
5391 dev = dev_get_by_index(tgt_net, ifm->ifa_index);
5393 ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1);
5395 err = -EADDRNOTAVAIL;
5399 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
5405 err = inet6_fill_ifaddr(skb, ifa, &fillargs);
5407 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5408 WARN_ON(err == -EMSGSIZE);
5412 err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid);
5418 if (fillargs.netnsid >= 0)
5424 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
5426 struct sk_buff *skb;
5427 struct net *net = dev_net(ifa->idev->dev);
5428 struct inet6_fill_args fillargs = {
5437 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5441 err = inet6_fill_ifaddr(skb, ifa, &fillargs);
5443 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5444 WARN_ON(err == -EMSGSIZE);
5448 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
5452 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
5455 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
5456 __s32 *array, int bytes)
5458 BUG_ON(bytes < (DEVCONF_MAX * 4));
5460 memset(array, 0, bytes);
5461 array[DEVCONF_FORWARDING] = cnf->forwarding;
5462 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
5463 array[DEVCONF_MTU6] = cnf->mtu6;
5464 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
5465 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
5466 array[DEVCONF_AUTOCONF] = cnf->autoconf;
5467 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
5468 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
5469 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
5470 jiffies_to_msecs(cnf->rtr_solicit_interval);
5471 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
5472 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
5473 array[DEVCONF_RTR_SOLICIT_DELAY] =
5474 jiffies_to_msecs(cnf->rtr_solicit_delay);
5475 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
5476 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
5477 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
5478 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
5479 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
5480 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
5481 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
5482 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
5483 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
5484 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
5485 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
5486 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
5487 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
5488 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
5489 #ifdef CONFIG_IPV6_ROUTER_PREF
5490 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
5491 array[DEVCONF_RTR_PROBE_INTERVAL] =
5492 jiffies_to_msecs(cnf->rtr_probe_interval);
5493 #ifdef CONFIG_IPV6_ROUTE_INFO
5494 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen;
5495 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
5498 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
5499 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
5500 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5501 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
5502 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
5504 #ifdef CONFIG_IPV6_MROUTE
5505 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
5507 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
5508 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
5509 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5510 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
5511 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
5512 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
5513 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
5514 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
5515 /* we omit DEVCONF_STABLE_SECRET for now */
5516 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
5517 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
5518 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
5519 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
5520 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled;
5521 #ifdef CONFIG_IPV6_SEG6_HMAC
5522 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac;
5524 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad;
5525 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode;
5526 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy;
5527 array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass;
5528 array[DEVCONF_RPL_SEG_ENABLED] = cnf->rpl_seg_enabled;
5531 static inline size_t inet6_ifla6_size(void)
5533 return nla_total_size(4) /* IFLA_INET6_FLAGS */
5534 + nla_total_size(sizeof(struct ifla_cacheinfo))
5535 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5536 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
5537 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
5538 + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */
5539 + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */
5543 static inline size_t inet6_if_nlmsg_size(void)
5545 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5546 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5547 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5548 + nla_total_size(4) /* IFLA_MTU */
5549 + nla_total_size(4) /* IFLA_LINK */
5550 + nla_total_size(1) /* IFLA_OPERSTATE */
5551 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
5554 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
5558 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
5561 /* Use put_unaligned() because stats may not be aligned for u64. */
5562 put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5563 for (i = 1; i < ICMP6_MIB_MAX; i++)
5564 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
5566 memset(&stats[ICMP6_MIB_MAX], 0, pad);
5569 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
5570 int bytes, size_t syncpoff)
5573 u64 buff[IPSTATS_MIB_MAX];
5574 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5578 memset(buff, 0, sizeof(buff));
5579 buff[0] = IPSTATS_MIB_MAX;
5581 for_each_possible_cpu(c) {
5582 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5583 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5586 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5587 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
5590 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5594 case IFLA_INET6_STATS:
5595 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5596 offsetof(struct ipstats_mib, syncp));
5598 case IFLA_INET6_ICMP6STATS:
5599 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
5604 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5605 u32 ext_filter_mask)
5608 struct ifla_cacheinfo ci;
5610 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5611 goto nla_put_failure;
5612 ci.max_reasm_len = IPV6_MAXPLEN;
5613 ci.tstamp = cstamp_delta(idev->tstamp);
5614 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
5615 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
5616 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5617 goto nla_put_failure;
5618 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
5620 goto nla_put_failure;
5621 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5623 /* XXX - MC not implemented */
5625 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5628 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
5630 goto nla_put_failure;
5631 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5633 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
5635 goto nla_put_failure;
5636 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5638 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
5640 goto nla_put_failure;
5641 read_lock_bh(&idev->lock);
5642 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5643 read_unlock_bh(&idev->lock);
5645 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode))
5646 goto nla_put_failure;
5654 static size_t inet6_get_link_af_size(const struct net_device *dev,
5655 u32 ext_filter_mask)
5657 if (!__in6_dev_get(dev))
5660 return inet6_ifla6_size();
5663 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5664 u32 ext_filter_mask)
5666 struct inet6_dev *idev = __in6_dev_get(dev);
5671 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
5677 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
5679 struct inet6_ifaddr *ifp;
5680 struct net_device *dev = idev->dev;
5681 bool clear_token, update_rs = false;
5682 struct in6_addr ll_addr;
5688 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5690 if (!ipv6_accept_ra(idev))
5692 if (idev->cnf.rtr_solicits == 0)
5695 write_lock_bh(&idev->lock);
5697 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5698 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5700 write_unlock_bh(&idev->lock);
5702 clear_token = ipv6_addr_any(token);
5706 if (!idev->dead && (idev->if_flags & IF_READY) &&
5707 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5708 IFA_F_OPTIMISTIC)) {
5709 /* If we're not ready, then normal ifup will take care
5710 * of this. Otherwise, we need to request our rs here.
5712 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5717 write_lock_bh(&idev->lock);
5720 idev->if_flags |= IF_RS_SENT;
5721 idev->rs_interval = rfc3315_s14_backoff_init(
5722 idev->cnf.rtr_solicit_interval);
5723 idev->rs_probes = 1;
5724 addrconf_mod_rs_timer(idev, idev->rs_interval);
5727 /* Well, that's kinda nasty ... */
5728 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5729 spin_lock(&ifp->lock);
5730 if (ifp->tokenized) {
5732 ifp->prefered_lft = 0;
5734 spin_unlock(&ifp->lock);
5737 write_unlock_bh(&idev->lock);
5738 inet6_ifinfo_notify(RTM_NEWLINK, idev);
5739 addrconf_verify_rtnl();
5743 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5744 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5745 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5748 static int check_addr_gen_mode(int mode)
5750 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5751 mode != IN6_ADDR_GEN_MODE_NONE &&
5752 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5753 mode != IN6_ADDR_GEN_MODE_RANDOM)
5758 static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5761 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5762 !idev->cnf.stable_secret.initialized &&
5763 !net->ipv6.devconf_dflt->stable_secret.initialized)
5768 static int inet6_validate_link_af(const struct net_device *dev,
5769 const struct nlattr *nla)
5771 struct nlattr *tb[IFLA_INET6_MAX + 1];
5772 struct inet6_dev *idev = NULL;
5776 idev = __in6_dev_get(dev);
5778 return -EAFNOSUPPORT;
5781 err = nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla,
5782 inet6_af_policy, NULL);
5786 if (!tb[IFLA_INET6_TOKEN] && !tb[IFLA_INET6_ADDR_GEN_MODE])
5789 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5790 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5792 if (check_addr_gen_mode(mode) < 0)
5794 if (dev && check_stable_privacy(idev, dev_net(dev), mode) < 0)
5801 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5803 struct inet6_dev *idev = __in6_dev_get(dev);
5804 struct nlattr *tb[IFLA_INET6_MAX + 1];
5808 return -EAFNOSUPPORT;
5810 if (nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0)
5813 if (tb[IFLA_INET6_TOKEN]) {
5814 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
5819 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5820 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5822 idev->cnf.addr_gen_mode = mode;
5828 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
5829 u32 portid, u32 seq, int event, unsigned int flags)
5831 struct net_device *dev = idev->dev;
5832 struct ifinfomsg *hdr;
5833 struct nlmsghdr *nlh;
5836 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
5840 hdr = nlmsg_data(nlh);
5841 hdr->ifi_family = AF_INET6;
5843 hdr->ifi_type = dev->type;
5844 hdr->ifi_index = dev->ifindex;
5845 hdr->ifi_flags = dev_get_flags(dev);
5846 hdr->ifi_change = 0;
5848 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5850 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5851 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
5852 (dev->ifindex != dev_get_iflink(dev) &&
5853 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5854 nla_put_u8(skb, IFLA_OPERSTATE,
5855 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
5856 goto nla_put_failure;
5857 protoinfo = nla_nest_start_noflag(skb, IFLA_PROTINFO);
5859 goto nla_put_failure;
5861 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
5862 goto nla_put_failure;
5864 nla_nest_end(skb, protoinfo);
5865 nlmsg_end(skb, nlh);
5869 nlmsg_cancel(skb, nlh);
5873 static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh,
5874 struct netlink_ext_ack *extack)
5876 struct ifinfomsg *ifm;
5878 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5879 NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request");
5883 if (nlmsg_attrlen(nlh, sizeof(*ifm))) {
5884 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header");
5888 ifm = nlmsg_data(nlh);
5889 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
5890 ifm->ifi_change || ifm->ifi_index) {
5891 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request");
5898 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5900 struct net *net = sock_net(skb->sk);
5903 struct net_device *dev;
5904 struct inet6_dev *idev;
5905 struct hlist_head *head;
5907 /* only requests using strict checking can pass data to
5908 * influence the dump
5910 if (cb->strict_check) {
5911 int err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack);
5918 s_idx = cb->args[1];
5921 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5923 head = &net->dev_index_head[h];
5924 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5927 idev = __in6_dev_get(dev);
5930 if (inet6_fill_ifinfo(skb, idev,
5931 NETLINK_CB(cb->skb).portid,
5933 RTM_NEWLINK, NLM_F_MULTI) < 0)
5947 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5949 struct sk_buff *skb;
5950 struct net *net = dev_net(idev->dev);
5953 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
5957 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
5959 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5960 WARN_ON(err == -EMSGSIZE);
5964 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
5968 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
5971 static inline size_t inet6_prefix_nlmsg_size(void)
5973 return NLMSG_ALIGN(sizeof(struct prefixmsg))
5974 + nla_total_size(sizeof(struct in6_addr))
5975 + nla_total_size(sizeof(struct prefix_cacheinfo));
5978 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
5979 struct prefix_info *pinfo, u32 portid, u32 seq,
5980 int event, unsigned int flags)
5982 struct prefixmsg *pmsg;
5983 struct nlmsghdr *nlh;
5984 struct prefix_cacheinfo ci;
5986 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
5990 pmsg = nlmsg_data(nlh);
5991 pmsg->prefix_family = AF_INET6;
5992 pmsg->prefix_pad1 = 0;
5993 pmsg->prefix_pad2 = 0;
5994 pmsg->prefix_ifindex = idev->dev->ifindex;
5995 pmsg->prefix_len = pinfo->prefix_len;
5996 pmsg->prefix_type = pinfo->type;
5997 pmsg->prefix_pad3 = 0;
5998 pmsg->prefix_flags = 0;
6000 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
6001 if (pinfo->autoconf)
6002 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
6004 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
6005 goto nla_put_failure;
6006 ci.preferred_time = ntohl(pinfo->prefered);
6007 ci.valid_time = ntohl(pinfo->valid);
6008 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
6009 goto nla_put_failure;
6010 nlmsg_end(skb, nlh);
6014 nlmsg_cancel(skb, nlh);
6018 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
6019 struct prefix_info *pinfo)
6021 struct sk_buff *skb;
6022 struct net *net = dev_net(idev->dev);
6025 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
6029 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
6031 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
6032 WARN_ON(err == -EMSGSIZE);
6036 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
6040 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
6043 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
6045 struct net *net = dev_net(ifp->idev->dev);
6050 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
6055 * If the address was optimistic we inserted the route at the
6056 * start of our DAD process, so we don't need to do it again.
6057 * If the device was taken down in the middle of the DAD
6058 * cycle there is a race where we could get here without a
6059 * host route, so nothing to insert. That will be fixed when
6060 * the device is brought up.
6062 if (ifp->rt && !rcu_access_pointer(ifp->rt->fib6_node)) {
6063 ip6_ins_rt(net, ifp->rt);
6064 } else if (!ifp->rt && (ifp->idev->dev->flags & IFF_UP)) {
6065 pr_warn("BUG: Address %pI6c on device %s is missing its host route.\n",
6066 &ifp->addr, ifp->idev->dev->name);
6069 if (ifp->idev->cnf.forwarding)
6070 addrconf_join_anycast(ifp);
6071 if (!ipv6_addr_any(&ifp->peer_addr))
6072 addrconf_prefix_route(&ifp->peer_addr, 128,
6073 ifp->rt_priority, ifp->idev->dev,
6077 if (ifp->idev->cnf.forwarding)
6078 addrconf_leave_anycast(ifp);
6079 addrconf_leave_solict(ifp->idev, &ifp->addr);
6080 if (!ipv6_addr_any(&ifp->peer_addr)) {
6081 struct fib6_info *rt;
6083 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
6084 ifp->idev->dev, 0, 0,
6087 ip6_del_rt(net, rt, false);
6090 ip6_del_rt(net, ifp->rt, false);
6093 rt_genid_bump_ipv6(net);
6096 atomic_inc(&net->ipv6.dev_addr_genid);
6099 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
6102 if (likely(ifp->idev->dead == 0))
6103 __ipv6_ifa_notify(event, ifp);
6104 rcu_read_unlock_bh();
6107 #ifdef CONFIG_SYSCTL
6109 static int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
6110 void *buffer, size_t *lenp, loff_t *ppos)
6112 int *valp = ctl->data;
6115 struct ctl_table lctl;
6119 * ctl->data points to idev->cnf.forwarding, we should
6120 * not modify it until we get the rtnl lock.
6125 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6128 ret = addrconf_fixup_forwarding(ctl, valp, val);
6134 static int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
6135 void *buffer, size_t *lenp, loff_t *ppos)
6137 struct inet6_dev *idev = ctl->extra1;
6138 int min_mtu = IPV6_MIN_MTU;
6139 struct ctl_table lctl;
6142 lctl.extra1 = &min_mtu;
6143 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
6145 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
6148 static void dev_disable_change(struct inet6_dev *idev)
6150 struct netdev_notifier_info info;
6152 if (!idev || !idev->dev)
6155 netdev_notifier_info_init(&info, idev->dev);
6156 if (idev->cnf.disable_ipv6)
6157 addrconf_notify(NULL, NETDEV_DOWN, &info);
6159 addrconf_notify(NULL, NETDEV_UP, &info);
6162 static void addrconf_disable_change(struct net *net, __s32 newf)
6164 struct net_device *dev;
6165 struct inet6_dev *idev;
6167 for_each_netdev(net, dev) {
6168 idev = __in6_dev_get(dev);
6170 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
6171 idev->cnf.disable_ipv6 = newf;
6173 dev_disable_change(idev);
6178 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
6183 if (!rtnl_trylock())
6184 return restart_syscall();
6186 net = (struct net *)table->extra2;
6190 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
6195 if (p == &net->ipv6.devconf_all->disable_ipv6) {
6196 net->ipv6.devconf_dflt->disable_ipv6 = newf;
6197 addrconf_disable_change(net, newf);
6198 } else if ((!newf) ^ (!old))
6199 dev_disable_change((struct inet6_dev *)table->extra1);
6205 static int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
6206 void *buffer, size_t *lenp, loff_t *ppos)
6208 int *valp = ctl->data;
6211 struct ctl_table lctl;
6215 * ctl->data points to idev->cnf.disable_ipv6, we should
6216 * not modify it until we get the rtnl lock.
6221 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6224 ret = addrconf_disable_ipv6(ctl, valp, val);
6230 static int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
6231 void *buffer, size_t *lenp, loff_t *ppos)
6233 int *valp = ctl->data;
6238 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
6241 if (write && old != new) {
6242 struct net *net = ctl->extra2;
6244 if (!rtnl_trylock())
6245 return restart_syscall();
6247 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
6248 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6249 NETCONFA_PROXY_NEIGH,
6250 NETCONFA_IFINDEX_DEFAULT,
6251 net->ipv6.devconf_dflt);
6252 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
6253 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6254 NETCONFA_PROXY_NEIGH,
6255 NETCONFA_IFINDEX_ALL,
6256 net->ipv6.devconf_all);
6258 struct inet6_dev *idev = ctl->extra1;
6260 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6261 NETCONFA_PROXY_NEIGH,
6271 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
6272 void *buffer, size_t *lenp,
6277 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
6278 struct net *net = (struct net *)ctl->extra2;
6279 struct ctl_table tmp = {
6281 .maxlen = sizeof(new_val),
6285 if (!rtnl_trylock())
6286 return restart_syscall();
6288 new_val = *((u32 *)ctl->data);
6290 ret = proc_douintvec(&tmp, write, buffer, lenp, ppos);
6295 if (check_addr_gen_mode(new_val) < 0) {
6301 if (check_stable_privacy(idev, net, new_val) < 0) {
6306 if (idev->cnf.addr_gen_mode != new_val) {
6307 idev->cnf.addr_gen_mode = new_val;
6308 addrconf_dev_config(idev->dev);
6310 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) {
6311 struct net_device *dev;
6313 net->ipv6.devconf_dflt->addr_gen_mode = new_val;
6314 for_each_netdev(net, dev) {
6315 idev = __in6_dev_get(dev);
6317 idev->cnf.addr_gen_mode != new_val) {
6318 idev->cnf.addr_gen_mode = new_val;
6319 addrconf_dev_config(idev->dev);
6324 *((u32 *)ctl->data) = new_val;
6333 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
6334 void *buffer, size_t *lenp,
6338 struct in6_addr addr;
6339 char str[IPV6_MAX_STRLEN];
6340 struct ctl_table lctl = *ctl;
6341 struct net *net = ctl->extra2;
6342 struct ipv6_stable_secret *secret = ctl->data;
6344 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
6347 lctl.maxlen = IPV6_MAX_STRLEN;
6350 if (!rtnl_trylock())
6351 return restart_syscall();
6353 if (!write && !secret->initialized) {
6358 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
6359 if (err >= sizeof(str)) {
6364 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
6368 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
6373 secret->initialized = true;
6374 secret->secret = addr;
6376 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
6377 struct net_device *dev;
6379 for_each_netdev(net, dev) {
6380 struct inet6_dev *idev = __in6_dev_get(dev);
6383 idev->cnf.addr_gen_mode =
6384 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
6388 struct inet6_dev *idev = ctl->extra1;
6390 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
6400 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
6401 int write, void *buffer,
6405 int *valp = ctl->data;
6408 struct ctl_table lctl;
6411 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
6412 * we should not modify it until we get the rtnl lock.
6417 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6420 ret = addrconf_fixup_linkdown(ctl, valp, val);
6427 void addrconf_set_nopolicy(struct rt6_info *rt, int action)
6431 rt->dst.flags |= DST_NOPOLICY;
6433 rt->dst.flags &= ~DST_NOPOLICY;
6438 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
6440 struct inet6_ifaddr *ifa;
6442 read_lock_bh(&idev->lock);
6443 list_for_each_entry(ifa, &idev->addr_list, if_list) {
6444 spin_lock(&ifa->lock);
6446 /* host routes only use builtin fib6_nh */
6447 struct fib6_nh *nh = ifa->rt->fib6_nh;
6451 ifa->rt->dst_nopolicy = val ? true : false;
6452 if (nh->rt6i_pcpu) {
6453 for_each_possible_cpu(cpu) {
6454 struct rt6_info **rtp;
6456 rtp = per_cpu_ptr(nh->rt6i_pcpu, cpu);
6457 addrconf_set_nopolicy(*rtp, val);
6462 spin_unlock(&ifa->lock);
6464 read_unlock_bh(&idev->lock);
6468 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val)
6470 struct inet6_dev *idev;
6473 if (!rtnl_trylock())
6474 return restart_syscall();
6478 net = (struct net *)ctl->extra2;
6479 if (valp == &net->ipv6.devconf_dflt->disable_policy) {
6484 if (valp == &net->ipv6.devconf_all->disable_policy) {
6485 struct net_device *dev;
6487 for_each_netdev(net, dev) {
6488 idev = __in6_dev_get(dev);
6490 addrconf_disable_policy_idev(idev, val);
6493 idev = (struct inet6_dev *)ctl->extra1;
6494 addrconf_disable_policy_idev(idev, val);
6501 static int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write,
6502 void *buffer, size_t *lenp, loff_t *ppos)
6504 int *valp = ctl->data;
6507 struct ctl_table lctl;
6512 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6514 if (write && (*valp != val))
6515 ret = addrconf_disable_policy(ctl, valp, val);
6523 static int minus_one = -1;
6524 static const int two_five_five = 255;
6526 static const struct ctl_table addrconf_sysctl[] = {
6528 .procname = "forwarding",
6529 .data = &ipv6_devconf.forwarding,
6530 .maxlen = sizeof(int),
6532 .proc_handler = addrconf_sysctl_forward,
6535 .procname = "hop_limit",
6536 .data = &ipv6_devconf.hop_limit,
6537 .maxlen = sizeof(int),
6539 .proc_handler = proc_dointvec_minmax,
6540 .extra1 = (void *)SYSCTL_ONE,
6541 .extra2 = (void *)&two_five_five,
6545 .data = &ipv6_devconf.mtu6,
6546 .maxlen = sizeof(int),
6548 .proc_handler = addrconf_sysctl_mtu,
6551 .procname = "accept_ra",
6552 .data = &ipv6_devconf.accept_ra,
6553 .maxlen = sizeof(int),
6555 .proc_handler = proc_dointvec,
6558 .procname = "accept_redirects",
6559 .data = &ipv6_devconf.accept_redirects,
6560 .maxlen = sizeof(int),
6562 .proc_handler = proc_dointvec,
6565 .procname = "autoconf",
6566 .data = &ipv6_devconf.autoconf,
6567 .maxlen = sizeof(int),
6569 .proc_handler = proc_dointvec,
6572 .procname = "dad_transmits",
6573 .data = &ipv6_devconf.dad_transmits,
6574 .maxlen = sizeof(int),
6576 .proc_handler = proc_dointvec,
6579 .procname = "router_solicitations",
6580 .data = &ipv6_devconf.rtr_solicits,
6581 .maxlen = sizeof(int),
6583 .proc_handler = proc_dointvec_minmax,
6584 .extra1 = &minus_one,
6587 .procname = "router_solicitation_interval",
6588 .data = &ipv6_devconf.rtr_solicit_interval,
6589 .maxlen = sizeof(int),
6591 .proc_handler = proc_dointvec_jiffies,
6594 .procname = "router_solicitation_max_interval",
6595 .data = &ipv6_devconf.rtr_solicit_max_interval,
6596 .maxlen = sizeof(int),
6598 .proc_handler = proc_dointvec_jiffies,
6601 .procname = "router_solicitation_delay",
6602 .data = &ipv6_devconf.rtr_solicit_delay,
6603 .maxlen = sizeof(int),
6605 .proc_handler = proc_dointvec_jiffies,
6608 .procname = "force_mld_version",
6609 .data = &ipv6_devconf.force_mld_version,
6610 .maxlen = sizeof(int),
6612 .proc_handler = proc_dointvec,
6615 .procname = "mldv1_unsolicited_report_interval",
6617 &ipv6_devconf.mldv1_unsolicited_report_interval,
6618 .maxlen = sizeof(int),
6620 .proc_handler = proc_dointvec_ms_jiffies,
6623 .procname = "mldv2_unsolicited_report_interval",
6625 &ipv6_devconf.mldv2_unsolicited_report_interval,
6626 .maxlen = sizeof(int),
6628 .proc_handler = proc_dointvec_ms_jiffies,
6631 .procname = "use_tempaddr",
6632 .data = &ipv6_devconf.use_tempaddr,
6633 .maxlen = sizeof(int),
6635 .proc_handler = proc_dointvec,
6638 .procname = "temp_valid_lft",
6639 .data = &ipv6_devconf.temp_valid_lft,
6640 .maxlen = sizeof(int),
6642 .proc_handler = proc_dointvec,
6645 .procname = "temp_prefered_lft",
6646 .data = &ipv6_devconf.temp_prefered_lft,
6647 .maxlen = sizeof(int),
6649 .proc_handler = proc_dointvec,
6652 .procname = "regen_max_retry",
6653 .data = &ipv6_devconf.regen_max_retry,
6654 .maxlen = sizeof(int),
6656 .proc_handler = proc_dointvec,
6659 .procname = "max_desync_factor",
6660 .data = &ipv6_devconf.max_desync_factor,
6661 .maxlen = sizeof(int),
6663 .proc_handler = proc_dointvec,
6666 .procname = "max_addresses",
6667 .data = &ipv6_devconf.max_addresses,
6668 .maxlen = sizeof(int),
6670 .proc_handler = proc_dointvec,
6673 .procname = "accept_ra_defrtr",
6674 .data = &ipv6_devconf.accept_ra_defrtr,
6675 .maxlen = sizeof(int),
6677 .proc_handler = proc_dointvec,
6680 .procname = "accept_ra_min_hop_limit",
6681 .data = &ipv6_devconf.accept_ra_min_hop_limit,
6682 .maxlen = sizeof(int),
6684 .proc_handler = proc_dointvec,
6687 .procname = "accept_ra_pinfo",
6688 .data = &ipv6_devconf.accept_ra_pinfo,
6689 .maxlen = sizeof(int),
6691 .proc_handler = proc_dointvec,
6693 #ifdef CONFIG_IPV6_ROUTER_PREF
6695 .procname = "accept_ra_rtr_pref",
6696 .data = &ipv6_devconf.accept_ra_rtr_pref,
6697 .maxlen = sizeof(int),
6699 .proc_handler = proc_dointvec,
6702 .procname = "router_probe_interval",
6703 .data = &ipv6_devconf.rtr_probe_interval,
6704 .maxlen = sizeof(int),
6706 .proc_handler = proc_dointvec_jiffies,
6708 #ifdef CONFIG_IPV6_ROUTE_INFO
6710 .procname = "accept_ra_rt_info_min_plen",
6711 .data = &ipv6_devconf.accept_ra_rt_info_min_plen,
6712 .maxlen = sizeof(int),
6714 .proc_handler = proc_dointvec,
6717 .procname = "accept_ra_rt_info_max_plen",
6718 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
6719 .maxlen = sizeof(int),
6721 .proc_handler = proc_dointvec,
6726 .procname = "proxy_ndp",
6727 .data = &ipv6_devconf.proxy_ndp,
6728 .maxlen = sizeof(int),
6730 .proc_handler = addrconf_sysctl_proxy_ndp,
6733 .procname = "accept_source_route",
6734 .data = &ipv6_devconf.accept_source_route,
6735 .maxlen = sizeof(int),
6737 .proc_handler = proc_dointvec,
6739 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
6741 .procname = "optimistic_dad",
6742 .data = &ipv6_devconf.optimistic_dad,
6743 .maxlen = sizeof(int),
6745 .proc_handler = proc_dointvec,
6748 .procname = "use_optimistic",
6749 .data = &ipv6_devconf.use_optimistic,
6750 .maxlen = sizeof(int),
6752 .proc_handler = proc_dointvec,
6755 #ifdef CONFIG_IPV6_MROUTE
6757 .procname = "mc_forwarding",
6758 .data = &ipv6_devconf.mc_forwarding,
6759 .maxlen = sizeof(int),
6761 .proc_handler = proc_dointvec,
6765 .procname = "disable_ipv6",
6766 .data = &ipv6_devconf.disable_ipv6,
6767 .maxlen = sizeof(int),
6769 .proc_handler = addrconf_sysctl_disable,
6772 .procname = "accept_dad",
6773 .data = &ipv6_devconf.accept_dad,
6774 .maxlen = sizeof(int),
6776 .proc_handler = proc_dointvec,
6779 .procname = "force_tllao",
6780 .data = &ipv6_devconf.force_tllao,
6781 .maxlen = sizeof(int),
6783 .proc_handler = proc_dointvec
6786 .procname = "ndisc_notify",
6787 .data = &ipv6_devconf.ndisc_notify,
6788 .maxlen = sizeof(int),
6790 .proc_handler = proc_dointvec
6793 .procname = "suppress_frag_ndisc",
6794 .data = &ipv6_devconf.suppress_frag_ndisc,
6795 .maxlen = sizeof(int),
6797 .proc_handler = proc_dointvec
6800 .procname = "accept_ra_from_local",
6801 .data = &ipv6_devconf.accept_ra_from_local,
6802 .maxlen = sizeof(int),
6804 .proc_handler = proc_dointvec,
6807 .procname = "accept_ra_mtu",
6808 .data = &ipv6_devconf.accept_ra_mtu,
6809 .maxlen = sizeof(int),
6811 .proc_handler = proc_dointvec,
6814 .procname = "stable_secret",
6815 .data = &ipv6_devconf.stable_secret,
6816 .maxlen = IPV6_MAX_STRLEN,
6818 .proc_handler = addrconf_sysctl_stable_secret,
6821 .procname = "use_oif_addrs_only",
6822 .data = &ipv6_devconf.use_oif_addrs_only,
6823 .maxlen = sizeof(int),
6825 .proc_handler = proc_dointvec,
6828 .procname = "ignore_routes_with_linkdown",
6829 .data = &ipv6_devconf.ignore_routes_with_linkdown,
6830 .maxlen = sizeof(int),
6832 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
6835 .procname = "drop_unicast_in_l2_multicast",
6836 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
6837 .maxlen = sizeof(int),
6839 .proc_handler = proc_dointvec,
6842 .procname = "drop_unsolicited_na",
6843 .data = &ipv6_devconf.drop_unsolicited_na,
6844 .maxlen = sizeof(int),
6846 .proc_handler = proc_dointvec,
6849 .procname = "keep_addr_on_down",
6850 .data = &ipv6_devconf.keep_addr_on_down,
6851 .maxlen = sizeof(int),
6853 .proc_handler = proc_dointvec,
6857 .procname = "seg6_enabled",
6858 .data = &ipv6_devconf.seg6_enabled,
6859 .maxlen = sizeof(int),
6861 .proc_handler = proc_dointvec,
6863 #ifdef CONFIG_IPV6_SEG6_HMAC
6865 .procname = "seg6_require_hmac",
6866 .data = &ipv6_devconf.seg6_require_hmac,
6867 .maxlen = sizeof(int),
6869 .proc_handler = proc_dointvec,
6873 .procname = "enhanced_dad",
6874 .data = &ipv6_devconf.enhanced_dad,
6875 .maxlen = sizeof(int),
6877 .proc_handler = proc_dointvec,
6880 .procname = "addr_gen_mode",
6881 .data = &ipv6_devconf.addr_gen_mode,
6882 .maxlen = sizeof(int),
6884 .proc_handler = addrconf_sysctl_addr_gen_mode,
6887 .procname = "disable_policy",
6888 .data = &ipv6_devconf.disable_policy,
6889 .maxlen = sizeof(int),
6891 .proc_handler = addrconf_sysctl_disable_policy,
6894 .procname = "ndisc_tclass",
6895 .data = &ipv6_devconf.ndisc_tclass,
6896 .maxlen = sizeof(int),
6898 .proc_handler = proc_dointvec_minmax,
6899 .extra1 = (void *)SYSCTL_ZERO,
6900 .extra2 = (void *)&two_five_five,
6903 .procname = "rpl_seg_enabled",
6904 .data = &ipv6_devconf.rpl_seg_enabled,
6905 .maxlen = sizeof(int),
6907 .proc_handler = proc_dointvec,
6914 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
6915 struct inet6_dev *idev, struct ipv6_devconf *p)
6918 struct ctl_table *table;
6919 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
6921 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
6925 for (i = 0; table[i].data; i++) {
6926 table[i].data += (char *)p - (char *)&ipv6_devconf;
6927 /* If one of these is already set, then it is not safe to
6928 * overwrite either of them: this makes proc_dointvec_minmax
6931 if (!table[i].extra1 && !table[i].extra2) {
6932 table[i].extra1 = idev; /* embedded; no ref */
6933 table[i].extra2 = net;
6937 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
6939 p->sysctl_header = register_net_sysctl(net, path, table);
6940 if (!p->sysctl_header)
6943 if (!strcmp(dev_name, "all"))
6944 ifindex = NETCONFA_IFINDEX_ALL;
6945 else if (!strcmp(dev_name, "default"))
6946 ifindex = NETCONFA_IFINDEX_DEFAULT;
6948 ifindex = idev->dev->ifindex;
6949 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
6959 static void __addrconf_sysctl_unregister(struct net *net,
6960 struct ipv6_devconf *p, int ifindex)
6962 struct ctl_table *table;
6964 if (!p->sysctl_header)
6967 table = p->sysctl_header->ctl_table_arg;
6968 unregister_net_sysctl_table(p->sysctl_header);
6969 p->sysctl_header = NULL;
6972 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
6975 static int addrconf_sysctl_register(struct inet6_dev *idev)
6979 if (!sysctl_dev_name_is_allowed(idev->dev->name))
6982 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
6983 &ndisc_ifinfo_sysctl_change);
6986 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
6989 neigh_sysctl_unregister(idev->nd_parms);
6994 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
6996 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf,
6997 idev->dev->ifindex);
6998 neigh_sysctl_unregister(idev->nd_parms);
7004 static int __net_init addrconf_init_net(struct net *net)
7007 struct ipv6_devconf *all, *dflt;
7009 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
7013 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
7015 goto err_alloc_dflt;
7017 if (IS_ENABLED(CONFIG_SYSCTL) &&
7018 !net_eq(net, &init_net)) {
7019 switch (sysctl_devconf_inherit_init_net) {
7020 case 1: /* copy from init_net */
7021 memcpy(all, init_net.ipv6.devconf_all,
7022 sizeof(ipv6_devconf));
7023 memcpy(dflt, init_net.ipv6.devconf_dflt,
7024 sizeof(ipv6_devconf_dflt));
7026 case 3: /* copy from the current netns */
7027 memcpy(all, current->nsproxy->net_ns->ipv6.devconf_all,
7028 sizeof(ipv6_devconf));
7030 current->nsproxy->net_ns->ipv6.devconf_dflt,
7031 sizeof(ipv6_devconf_dflt));
7035 /* use compiled values */
7040 /* these will be inherited by all namespaces */
7041 dflt->autoconf = ipv6_defaults.autoconf;
7042 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
7044 dflt->stable_secret.initialized = false;
7045 all->stable_secret.initialized = false;
7047 net->ipv6.devconf_all = all;
7048 net->ipv6.devconf_dflt = dflt;
7050 #ifdef CONFIG_SYSCTL
7051 err = __addrconf_sysctl_register(net, "all", NULL, all);
7055 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
7061 #ifdef CONFIG_SYSCTL
7063 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
7073 static void __net_exit addrconf_exit_net(struct net *net)
7075 #ifdef CONFIG_SYSCTL
7076 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt,
7077 NETCONFA_IFINDEX_DEFAULT);
7078 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all,
7079 NETCONFA_IFINDEX_ALL);
7081 kfree(net->ipv6.devconf_dflt);
7082 kfree(net->ipv6.devconf_all);
7085 static struct pernet_operations addrconf_ops = {
7086 .init = addrconf_init_net,
7087 .exit = addrconf_exit_net,
7090 static struct rtnl_af_ops inet6_ops __read_mostly = {
7092 .fill_link_af = inet6_fill_link_af,
7093 .get_link_af_size = inet6_get_link_af_size,
7094 .validate_link_af = inet6_validate_link_af,
7095 .set_link_af = inet6_set_link_af,
7099 * Init / cleanup code
7102 int __init addrconf_init(void)
7104 struct inet6_dev *idev;
7107 err = ipv6_addr_label_init();
7109 pr_crit("%s: cannot initialize default policy table: %d\n",
7114 err = register_pernet_subsys(&addrconf_ops);
7118 addrconf_wq = create_workqueue("ipv6_addrconf");
7124 /* The addrconf netdev notifier requires that loopback_dev
7125 * has it's ipv6 private information allocated and setup
7126 * before it can bring up and give link-local addresses
7127 * to other devices which are up.
7129 * Unfortunately, loopback_dev is not necessarily the first
7130 * entry in the global dev_base list of net devices. In fact,
7131 * it is likely to be the very last entry on that list.
7132 * So this causes the notifier registry below to try and
7133 * give link-local addresses to all devices besides loopback_dev
7134 * first, then loopback_dev, which cases all the non-loopback_dev
7135 * devices to fail to get a link-local address.
7137 * So, as a temporary fix, allocate the ipv6 structure for
7138 * loopback_dev first by hand.
7139 * Longer term, all of the dependencies ipv6 has upon the loopback
7140 * device and it being up should be removed.
7143 idev = ipv6_add_dev(init_net.loopback_dev);
7146 err = PTR_ERR(idev);
7150 ip6_route_init_special_entries();
7152 for (i = 0; i < IN6_ADDR_HSIZE; i++)
7153 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
7155 register_netdevice_notifier(&ipv6_dev_notf);
7159 rtnl_af_register(&inet6_ops);
7161 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK,
7162 NULL, inet6_dump_ifinfo, 0);
7166 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR,
7167 inet6_rtm_newaddr, NULL, 0);
7170 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR,
7171 inet6_rtm_deladdr, NULL, 0);
7174 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR,
7175 inet6_rtm_getaddr, inet6_dump_ifaddr,
7176 RTNL_FLAG_DOIT_UNLOCKED);
7179 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST,
7180 NULL, inet6_dump_ifmcaddr, 0);
7183 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST,
7184 NULL, inet6_dump_ifacaddr, 0);
7187 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF,
7188 inet6_netconf_get_devconf,
7189 inet6_netconf_dump_devconf,
7190 RTNL_FLAG_DOIT_UNLOCKED);
7193 err = ipv6_addr_label_rtnl_register();
7199 rtnl_unregister_all(PF_INET6);
7200 rtnl_af_unregister(&inet6_ops);
7201 unregister_netdevice_notifier(&ipv6_dev_notf);
7203 destroy_workqueue(addrconf_wq);
7205 unregister_pernet_subsys(&addrconf_ops);
7207 ipv6_addr_label_cleanup();
7212 void addrconf_cleanup(void)
7214 struct net_device *dev;
7217 unregister_netdevice_notifier(&ipv6_dev_notf);
7218 unregister_pernet_subsys(&addrconf_ops);
7219 ipv6_addr_label_cleanup();
7221 rtnl_af_unregister(&inet6_ops);
7225 /* clean dev list */
7226 for_each_netdev(&init_net, dev) {
7227 if (__in6_dev_get(dev) == NULL)
7229 addrconf_ifdown(dev, true);
7231 addrconf_ifdown(init_net.loopback_dev, true);
7236 spin_lock_bh(&addrconf_hash_lock);
7237 for (i = 0; i < IN6_ADDR_HSIZE; i++)
7238 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
7239 spin_unlock_bh(&addrconf_hash_lock);
7240 cancel_delayed_work(&addr_chk_work);
7243 destroy_workqueue(addrconf_wq);