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_min_lft = 0,
211 .accept_ra_pinfo = 1,
212 #ifdef CONFIG_IPV6_ROUTER_PREF
213 .accept_ra_rtr_pref = 1,
214 .rtr_probe_interval = 60 * HZ,
215 #ifdef CONFIG_IPV6_ROUTE_INFO
216 .accept_ra_rt_info_min_plen = 0,
217 .accept_ra_rt_info_max_plen = 0,
221 .accept_source_route = 0, /* we do not accept RH0 by default. */
224 .suppress_frag_ndisc = 1,
227 .initialized = false,
229 .use_oif_addrs_only = 0,
230 .ignore_routes_with_linkdown = 0,
231 .keep_addr_on_down = 0,
233 #ifdef CONFIG_IPV6_SEG6_HMAC
234 .seg6_require_hmac = 0,
237 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
239 .rpl_seg_enabled = 0,
242 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
244 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
245 .mtu6 = IPV6_MIN_MTU,
247 .accept_redirects = 1,
249 .force_mld_version = 0,
250 .mldv1_unsolicited_report_interval = 10 * HZ,
251 .mldv2_unsolicited_report_interval = HZ,
253 .rtr_solicits = MAX_RTR_SOLICITATIONS,
254 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
255 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
256 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
258 .temp_valid_lft = TEMP_VALID_LIFETIME,
259 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
260 .regen_max_retry = REGEN_MAX_RETRY,
261 .max_desync_factor = MAX_DESYNC_FACTOR,
262 .max_addresses = IPV6_MAX_ADDRESSES,
263 .accept_ra_defrtr = 1,
264 .accept_ra_from_local = 0,
265 .accept_ra_min_hop_limit= 1,
266 .accept_ra_min_lft = 0,
267 .accept_ra_pinfo = 1,
268 #ifdef CONFIG_IPV6_ROUTER_PREF
269 .accept_ra_rtr_pref = 1,
270 .rtr_probe_interval = 60 * HZ,
271 #ifdef CONFIG_IPV6_ROUTE_INFO
272 .accept_ra_rt_info_min_plen = 0,
273 .accept_ra_rt_info_max_plen = 0,
277 .accept_source_route = 0, /* we do not accept RH0 by default. */
280 .suppress_frag_ndisc = 1,
283 .initialized = false,
285 .use_oif_addrs_only = 0,
286 .ignore_routes_with_linkdown = 0,
287 .keep_addr_on_down = 0,
289 #ifdef CONFIG_IPV6_SEG6_HMAC
290 .seg6_require_hmac = 0,
293 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
295 .rpl_seg_enabled = 0,
298 /* Check if link is ready: is it up and is a valid qdisc available */
299 static inline bool addrconf_link_ready(const struct net_device *dev)
301 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev);
304 static void addrconf_del_rs_timer(struct inet6_dev *idev)
306 if (del_timer(&idev->rs_timer))
310 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
312 if (cancel_delayed_work(&ifp->dad_work))
316 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
319 if (!mod_timer(&idev->rs_timer, jiffies + when))
323 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
327 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay))
331 static int snmp6_alloc_dev(struct inet6_dev *idev)
335 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
336 if (!idev->stats.ipv6)
339 for_each_possible_cpu(i) {
340 struct ipstats_mib *addrconf_stats;
341 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
342 u64_stats_init(&addrconf_stats->syncp);
346 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
348 if (!idev->stats.icmpv6dev)
350 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
352 if (!idev->stats.icmpv6msgdev)
358 kfree(idev->stats.icmpv6dev);
360 free_percpu(idev->stats.ipv6);
365 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
367 struct inet6_dev *ndev;
372 if (dev->mtu < IPV6_MIN_MTU)
373 return ERR_PTR(-EINVAL);
375 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
379 rwlock_init(&ndev->lock);
381 INIT_LIST_HEAD(&ndev->addr_list);
382 timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0);
383 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
385 if (ndev->cnf.stable_secret.initialized)
386 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
388 ndev->cnf.mtu6 = dev->mtu;
389 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
390 if (!ndev->nd_parms) {
394 if (ndev->cnf.forwarding)
395 dev_disable_lro(dev);
396 /* We refer to the device */
399 if (snmp6_alloc_dev(ndev) < 0) {
400 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n",
402 neigh_parms_release(&nd_tbl, ndev->nd_parms);
408 if (snmp6_register_dev(ndev) < 0) {
409 netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n",
410 __func__, dev->name);
414 /* One reference from device. */
415 refcount_set(&ndev->refcnt, 1);
417 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
418 ndev->cnf.accept_dad = -1;
420 #if IS_ENABLED(CONFIG_IPV6_SIT)
421 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
422 pr_info("%s: Disabled Multicast RS\n", dev->name);
423 ndev->cnf.rtr_solicits = 0;
427 INIT_LIST_HEAD(&ndev->tempaddr_list);
428 ndev->desync_factor = U32_MAX;
429 if ((dev->flags&IFF_LOOPBACK) ||
430 dev->type == ARPHRD_TUNNEL ||
431 dev->type == ARPHRD_TUNNEL6 ||
432 dev->type == ARPHRD_SIT ||
433 dev->type == ARPHRD_NONE) {
434 ndev->cnf.use_tempaddr = -1;
437 ndev->token = in6addr_any;
439 if (netif_running(dev) && addrconf_link_ready(dev))
440 ndev->if_flags |= IF_READY;
442 ipv6_mc_init_dev(ndev);
443 ndev->tstamp = jiffies;
444 err = addrconf_sysctl_register(ndev);
446 ipv6_mc_destroy_dev(ndev);
447 snmp6_unregister_dev(ndev);
450 /* protected by rtnl_lock */
451 rcu_assign_pointer(dev->ip6_ptr, ndev);
453 /* Join interface-local all-node multicast group */
454 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
456 /* Join all-node multicast group */
457 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
459 /* Join all-router multicast group if forwarding is set */
460 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
461 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
466 neigh_parms_release(&nd_tbl, ndev->nd_parms);
468 in6_dev_finish_destroy(ndev);
472 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
474 struct inet6_dev *idev;
478 idev = __in6_dev_get(dev);
480 idev = ipv6_add_dev(dev);
485 if (dev->flags&IFF_UP)
490 static int inet6_netconf_msgsize_devconf(int type)
492 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
493 + nla_total_size(4); /* NETCONFA_IFINDEX */
496 if (type == NETCONFA_ALL)
499 if (all || type == NETCONFA_FORWARDING)
500 size += nla_total_size(4);
501 #ifdef CONFIG_IPV6_MROUTE
502 if (all || type == NETCONFA_MC_FORWARDING)
503 size += nla_total_size(4);
505 if (all || type == NETCONFA_PROXY_NEIGH)
506 size += nla_total_size(4);
508 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
509 size += nla_total_size(4);
514 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
515 struct ipv6_devconf *devconf, u32 portid,
516 u32 seq, int event, unsigned int flags,
519 struct nlmsghdr *nlh;
520 struct netconfmsg *ncm;
523 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
528 if (type == NETCONFA_ALL)
531 ncm = nlmsg_data(nlh);
532 ncm->ncm_family = AF_INET6;
534 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
535 goto nla_put_failure;
540 if ((all || type == NETCONFA_FORWARDING) &&
541 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
542 goto nla_put_failure;
543 #ifdef CONFIG_IPV6_MROUTE
544 if ((all || type == NETCONFA_MC_FORWARDING) &&
545 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
546 atomic_read(&devconf->mc_forwarding)) < 0)
547 goto nla_put_failure;
549 if ((all || type == NETCONFA_PROXY_NEIGH) &&
550 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
551 goto nla_put_failure;
553 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
554 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
555 devconf->ignore_routes_with_linkdown) < 0)
556 goto nla_put_failure;
563 nlmsg_cancel(skb, nlh);
567 void inet6_netconf_notify_devconf(struct net *net, int event, int type,
568 int ifindex, struct ipv6_devconf *devconf)
573 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL);
577 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
580 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
581 WARN_ON(err == -EMSGSIZE);
585 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL);
588 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
591 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
592 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
593 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
594 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
595 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
598 static int inet6_netconf_valid_get_req(struct sk_buff *skb,
599 const struct nlmsghdr *nlh,
601 struct netlink_ext_ack *extack)
605 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) {
606 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf get request");
610 if (!netlink_strict_get_check(skb))
611 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg),
613 devconf_ipv6_policy, extack);
615 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg),
617 devconf_ipv6_policy, extack);
621 for (i = 0; i <= NETCONFA_MAX; i++) {
626 case NETCONFA_IFINDEX:
629 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request");
637 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
638 struct nlmsghdr *nlh,
639 struct netlink_ext_ack *extack)
641 struct net *net = sock_net(in_skb->sk);
642 struct nlattr *tb[NETCONFA_MAX+1];
643 struct inet6_dev *in6_dev = NULL;
644 struct net_device *dev = NULL;
646 struct ipv6_devconf *devconf;
650 err = inet6_netconf_valid_get_req(in_skb, nlh, tb, extack);
654 if (!tb[NETCONFA_IFINDEX])
658 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
660 case NETCONFA_IFINDEX_ALL:
661 devconf = net->ipv6.devconf_all;
663 case NETCONFA_IFINDEX_DEFAULT:
664 devconf = net->ipv6.devconf_dflt;
667 dev = dev_get_by_index(net, ifindex);
670 in6_dev = in6_dev_get(dev);
673 devconf = &in6_dev->cnf;
678 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL);
682 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
683 NETLINK_CB(in_skb).portid,
684 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
687 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
688 WARN_ON(err == -EMSGSIZE);
692 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
695 in6_dev_put(in6_dev);
701 /* Combine dev_addr_genid and dev_base_seq to detect changes.
703 static u32 inet6_base_seq(const struct net *net)
705 u32 res = atomic_read(&net->ipv6.dev_addr_genid) +
708 /* Must not return 0 (see nl_dump_check_consistent()).
709 * Chose a value far away from 0.
717 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
718 struct netlink_callback *cb)
720 const struct nlmsghdr *nlh = cb->nlh;
721 struct net *net = sock_net(skb->sk);
724 struct net_device *dev;
725 struct inet6_dev *idev;
726 struct hlist_head *head;
728 if (cb->strict_check) {
729 struct netlink_ext_ack *extack = cb->extack;
730 struct netconfmsg *ncm;
732 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) {
733 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request");
737 if (nlmsg_attrlen(nlh, sizeof(*ncm))) {
738 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request");
744 s_idx = idx = cb->args[1];
746 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
748 head = &net->dev_index_head[h];
750 cb->seq = inet6_base_seq(net);
751 hlist_for_each_entry_rcu(dev, head, index_hlist) {
754 idev = __in6_dev_get(dev);
758 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
760 NETLINK_CB(cb->skb).portid,
768 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
774 if (h == NETDEV_HASHENTRIES) {
775 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
776 net->ipv6.devconf_all,
777 NETLINK_CB(cb->skb).portid,
779 RTM_NEWNETCONF, NLM_F_MULTI,
785 if (h == NETDEV_HASHENTRIES + 1) {
786 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
787 net->ipv6.devconf_dflt,
788 NETLINK_CB(cb->skb).portid,
790 RTM_NEWNETCONF, NLM_F_MULTI,
804 static void dev_forward_change(struct inet6_dev *idev)
806 struct net_device *dev;
807 struct inet6_ifaddr *ifa;
808 LIST_HEAD(tmp_addr_list);
813 if (idev->cnf.forwarding)
814 dev_disable_lro(dev);
815 if (dev->flags & IFF_MULTICAST) {
816 if (idev->cnf.forwarding) {
817 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
818 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
819 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
821 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
822 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
823 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
827 read_lock_bh(&idev->lock);
828 list_for_each_entry(ifa, &idev->addr_list, if_list) {
829 if (ifa->flags&IFA_F_TENTATIVE)
831 list_add_tail(&ifa->if_list_aux, &tmp_addr_list);
833 read_unlock_bh(&idev->lock);
835 while (!list_empty(&tmp_addr_list)) {
836 ifa = list_first_entry(&tmp_addr_list,
837 struct inet6_ifaddr, if_list_aux);
838 list_del(&ifa->if_list_aux);
839 if (idev->cnf.forwarding)
840 addrconf_join_anycast(ifa);
842 addrconf_leave_anycast(ifa);
845 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
847 dev->ifindex, &idev->cnf);
851 static void addrconf_forward_change(struct net *net, __s32 newf)
853 struct net_device *dev;
854 struct inet6_dev *idev;
856 for_each_netdev(net, dev) {
857 idev = __in6_dev_get(dev);
859 int changed = (!idev->cnf.forwarding) ^ (!newf);
860 idev->cnf.forwarding = newf;
862 dev_forward_change(idev);
867 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
873 return restart_syscall();
875 net = (struct net *)table->extra2;
879 if (p == &net->ipv6.devconf_dflt->forwarding) {
880 if ((!newf) ^ (!old))
881 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
883 NETCONFA_IFINDEX_DEFAULT,
884 net->ipv6.devconf_dflt);
889 if (p == &net->ipv6.devconf_all->forwarding) {
890 int old_dflt = net->ipv6.devconf_dflt->forwarding;
892 net->ipv6.devconf_dflt->forwarding = newf;
893 if ((!newf) ^ (!old_dflt))
894 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
896 NETCONFA_IFINDEX_DEFAULT,
897 net->ipv6.devconf_dflt);
899 addrconf_forward_change(net, newf);
900 if ((!newf) ^ (!old))
901 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
903 NETCONFA_IFINDEX_ALL,
904 net->ipv6.devconf_all);
905 } else if ((!newf) ^ (!old))
906 dev_forward_change((struct inet6_dev *)table->extra1);
910 rt6_purge_dflt_routers(net);
914 static void addrconf_linkdown_change(struct net *net, __s32 newf)
916 struct net_device *dev;
917 struct inet6_dev *idev;
919 for_each_netdev(net, dev) {
920 idev = __in6_dev_get(dev);
922 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
924 idev->cnf.ignore_routes_with_linkdown = newf;
926 inet6_netconf_notify_devconf(dev_net(dev),
928 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
935 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
941 return restart_syscall();
943 net = (struct net *)table->extra2;
947 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
948 if ((!newf) ^ (!old))
949 inet6_netconf_notify_devconf(net,
951 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
952 NETCONFA_IFINDEX_DEFAULT,
953 net->ipv6.devconf_dflt);
958 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
959 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
960 addrconf_linkdown_change(net, newf);
961 if ((!newf) ^ (!old))
962 inet6_netconf_notify_devconf(net,
964 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
965 NETCONFA_IFINDEX_ALL,
966 net->ipv6.devconf_all);
975 /* Nobody refers to this ifaddr, destroy it */
976 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
978 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
980 #ifdef NET_REFCNT_DEBUG
981 pr_debug("%s\n", __func__);
984 in6_dev_put(ifp->idev);
986 if (cancel_delayed_work(&ifp->dad_work))
987 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
990 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
991 pr_warn("Freeing alive inet6 address %p\n", ifp);
999 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
1001 struct list_head *p;
1002 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
1005 * Each device address list is sorted in order of scope -
1006 * global before linklocal.
1008 list_for_each(p, &idev->addr_list) {
1009 struct inet6_ifaddr *ifa
1010 = list_entry(p, struct inet6_ifaddr, if_list);
1011 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
1015 list_add_tail_rcu(&ifp->if_list, p);
1018 static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr)
1020 u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net);
1022 return hash_32(val, IN6_ADDR_HSIZE_SHIFT);
1025 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1026 struct net_device *dev, unsigned int hash)
1028 struct inet6_ifaddr *ifp;
1030 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1031 if (!net_eq(dev_net(ifp->idev->dev), net))
1033 if (ipv6_addr_equal(&ifp->addr, addr)) {
1034 if (!dev || ifp->idev->dev == dev)
1041 static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa)
1043 unsigned int hash = inet6_addr_hash(dev_net(dev), &ifa->addr);
1046 spin_lock(&addrconf_hash_lock);
1048 /* Ignore adding duplicate addresses on an interface */
1049 if (ipv6_chk_same_addr(dev_net(dev), &ifa->addr, dev, hash)) {
1050 netdev_dbg(dev, "ipv6_add_addr: already assigned\n");
1053 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
1056 spin_unlock(&addrconf_hash_lock);
1061 /* On success it returns ifp with increased reference count */
1063 static struct inet6_ifaddr *
1064 ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg,
1065 bool can_block, struct netlink_ext_ack *extack)
1067 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC;
1068 int addr_type = ipv6_addr_type(cfg->pfx);
1069 struct net *net = dev_net(idev->dev);
1070 struct inet6_ifaddr *ifa = NULL;
1071 struct fib6_info *f6i = NULL;
1074 if (addr_type == IPV6_ADDR_ANY ||
1075 (addr_type & IPV6_ADDR_MULTICAST &&
1076 !(cfg->ifa_flags & IFA_F_MCAUTOJOIN)) ||
1077 (!(idev->dev->flags & IFF_LOOPBACK) &&
1078 !netif_is_l3_master(idev->dev) &&
1079 addr_type & IPV6_ADDR_LOOPBACK))
1080 return ERR_PTR(-EADDRNOTAVAIL);
1083 err = -ENODEV; /*XXX*/
1087 if (idev->cnf.disable_ipv6) {
1092 /* validator notifier needs to be blocking;
1093 * do not call in atomic context
1096 struct in6_validator_info i6vi = {
1097 .i6vi_addr = *cfg->pfx,
1102 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi);
1103 err = notifier_to_errno(err);
1108 ifa = kzalloc(sizeof(*ifa), gfp_flags);
1114 f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags);
1121 neigh_parms_data_state_setall(idev->nd_parms);
1123 ifa->addr = *cfg->pfx;
1125 ifa->peer_addr = *cfg->peer_pfx;
1127 spin_lock_init(&ifa->lock);
1128 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
1129 INIT_HLIST_NODE(&ifa->addr_lst);
1130 ifa->scope = cfg->scope;
1131 ifa->prefix_len = cfg->plen;
1132 ifa->rt_priority = cfg->rt_priority;
1133 ifa->flags = cfg->ifa_flags;
1134 /* No need to add the TENTATIVE flag for addresses with NODAD */
1135 if (!(cfg->ifa_flags & IFA_F_NODAD))
1136 ifa->flags |= IFA_F_TENTATIVE;
1137 ifa->valid_lft = cfg->valid_lft;
1138 ifa->prefered_lft = cfg->preferred_lft;
1139 ifa->cstamp = ifa->tstamp = jiffies;
1140 ifa->tokenized = false;
1148 refcount_set(&ifa->refcnt, 1);
1152 err = ipv6_add_addr_hash(idev->dev, ifa);
1154 rcu_read_unlock_bh();
1158 write_lock(&idev->lock);
1160 /* Add to inet6_dev unicast addr list. */
1161 ipv6_link_dev_addr(idev, ifa);
1163 if (ifa->flags&IFA_F_TEMPORARY) {
1164 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1169 write_unlock(&idev->lock);
1171 rcu_read_unlock_bh();
1173 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1175 if (unlikely(err < 0)) {
1176 fib6_info_release(f6i);
1180 in6_dev_put(ifa->idev);
1189 enum cleanup_prefix_rt_t {
1190 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1191 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1192 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1196 * Check, whether the prefix for ifp would still need a prefix route
1197 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1200 * 1) we don't purge prefix if address was not permanent.
1201 * prefix is managed by its own lifetime.
1202 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1203 * 3) if there are no addresses, delete prefix.
1204 * 4) if there are still other permanent address(es),
1205 * corresponding prefix is still permanent.
1206 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1207 * don't purge the prefix, assume user space is managing it.
1208 * 6) otherwise, update prefix lifetime to the
1209 * longest valid lifetime among the corresponding
1210 * addresses on the device.
1211 * Note: subsequent RA will update lifetime.
1213 static enum cleanup_prefix_rt_t
1214 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1216 struct inet6_ifaddr *ifa;
1217 struct inet6_dev *idev = ifp->idev;
1218 unsigned long lifetime;
1219 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1223 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1226 if (ifa->prefix_len != ifp->prefix_len ||
1227 !ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1230 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1231 return CLEANUP_PREFIX_RT_NOP;
1233 action = CLEANUP_PREFIX_RT_EXPIRE;
1235 spin_lock(&ifa->lock);
1237 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1239 * Note: Because this address is
1240 * not permanent, lifetime <
1241 * LONG_MAX / HZ here.
1243 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1244 *expires = ifa->tstamp + lifetime * HZ;
1245 spin_unlock(&ifa->lock);
1252 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires,
1253 bool del_rt, bool del_peer)
1255 struct fib6_info *f6i;
1257 f6i = addrconf_get_prefix_route(del_peer ? &ifp->peer_addr : &ifp->addr,
1259 ifp->idev->dev, 0, RTF_DEFAULT, true);
1262 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false);
1264 if (!(f6i->fib6_flags & RTF_EXPIRES))
1265 fib6_set_expires(f6i, expires);
1266 fib6_info_release(f6i);
1272 /* This function wants to get referenced ifp and releases it before return */
1274 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1277 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1278 unsigned long expires;
1282 spin_lock_bh(&ifp->lock);
1284 ifp->state = INET6_IFADDR_STATE_DEAD;
1285 spin_unlock_bh(&ifp->lock);
1287 if (state == INET6_IFADDR_STATE_DEAD)
1290 spin_lock_bh(&addrconf_hash_lock);
1291 hlist_del_init_rcu(&ifp->addr_lst);
1292 spin_unlock_bh(&addrconf_hash_lock);
1294 write_lock_bh(&ifp->idev->lock);
1296 if (ifp->flags&IFA_F_TEMPORARY) {
1297 list_del(&ifp->tmp_list);
1299 in6_ifa_put(ifp->ifpub);
1305 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1306 action = check_cleanup_prefix_route(ifp, &expires);
1308 list_del_rcu(&ifp->if_list);
1311 write_unlock_bh(&ifp->idev->lock);
1313 addrconf_del_dad_work(ifp);
1315 ipv6_ifa_notify(RTM_DELADDR, ifp);
1317 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1319 if (action != CLEANUP_PREFIX_RT_NOP) {
1320 cleanup_prefix_route(ifp, expires,
1321 action == CLEANUP_PREFIX_RT_DEL, false);
1324 /* clean up prefsrc entries */
1325 rt6_remove_prefsrc(ifp);
1330 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, bool block)
1332 struct inet6_dev *idev = ifp->idev;
1333 unsigned long tmp_tstamp, age;
1334 unsigned long regen_advance;
1335 unsigned long now = jiffies;
1336 s32 cnf_temp_preferred_lft;
1337 struct inet6_ifaddr *ift;
1338 struct ifa6_config cfg;
1339 long max_desync_factor;
1340 struct in6_addr addr;
1343 write_lock_bh(&idev->lock);
1347 if (idev->cnf.use_tempaddr <= 0) {
1348 write_unlock_bh(&idev->lock);
1349 pr_info("%s: use_tempaddr is disabled\n", __func__);
1354 spin_lock_bh(&ifp->lock);
1355 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1356 idev->cnf.use_tempaddr = -1; /*XXX*/
1357 spin_unlock_bh(&ifp->lock);
1358 write_unlock_bh(&idev->lock);
1359 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1366 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1367 ipv6_gen_rnd_iid(&addr);
1369 age = (now - ifp->tstamp) / HZ;
1371 regen_advance = idev->cnf.regen_max_retry *
1372 idev->cnf.dad_transmits *
1373 max(NEIGH_VAR(idev->nd_parms, RETRANS_TIME), HZ/100) / HZ;
1375 /* recalculate max_desync_factor each time and update
1376 * idev->desync_factor if it's larger
1378 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
1379 max_desync_factor = min_t(long,
1380 idev->cnf.max_desync_factor,
1381 cnf_temp_preferred_lft - regen_advance);
1383 if (unlikely(idev->desync_factor > max_desync_factor)) {
1384 if (max_desync_factor > 0) {
1385 get_random_bytes(&idev->desync_factor,
1386 sizeof(idev->desync_factor));
1387 idev->desync_factor %= max_desync_factor;
1389 idev->desync_factor = 0;
1393 memset(&cfg, 0, sizeof(cfg));
1394 cfg.valid_lft = min_t(__u32, ifp->valid_lft,
1395 idev->cnf.temp_valid_lft + age);
1396 cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor;
1397 cfg.preferred_lft = min_t(__u32, ifp->prefered_lft, cfg.preferred_lft);
1399 cfg.plen = ifp->prefix_len;
1400 tmp_tstamp = ifp->tstamp;
1401 spin_unlock_bh(&ifp->lock);
1403 write_unlock_bh(&idev->lock);
1405 /* A temporary address is created only if this calculated Preferred
1406 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1407 * an implementation must not create a temporary address with a zero
1408 * Preferred Lifetime.
1409 * Use age calculation as in addrconf_verify to avoid unnecessary
1410 * temporary addresses being generated.
1412 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1413 if (cfg.preferred_lft <= regen_advance + age) {
1420 cfg.ifa_flags = IFA_F_TEMPORARY;
1421 /* set in addrconf_prefix_rcv() */
1422 if (ifp->flags & IFA_F_OPTIMISTIC)
1423 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
1426 cfg.scope = ipv6_addr_scope(cfg.pfx);
1428 ift = ipv6_add_addr(idev, &cfg, block, NULL);
1432 pr_info("%s: retry temporary address regeneration\n", __func__);
1433 write_lock_bh(&idev->lock);
1437 spin_lock_bh(&ift->lock);
1440 ift->tstamp = tmp_tstamp;
1441 spin_unlock_bh(&ift->lock);
1443 addrconf_dad_start(ift);
1451 * Choose an appropriate source address (RFC3484)
1454 IPV6_SADDR_RULE_INIT = 0,
1455 IPV6_SADDR_RULE_LOCAL,
1456 IPV6_SADDR_RULE_SCOPE,
1457 IPV6_SADDR_RULE_PREFERRED,
1458 #ifdef CONFIG_IPV6_MIP6
1459 IPV6_SADDR_RULE_HOA,
1461 IPV6_SADDR_RULE_OIF,
1462 IPV6_SADDR_RULE_LABEL,
1463 IPV6_SADDR_RULE_PRIVACY,
1464 IPV6_SADDR_RULE_ORCHID,
1465 IPV6_SADDR_RULE_PREFIX,
1466 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1467 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1472 struct ipv6_saddr_score {
1475 struct inet6_ifaddr *ifa;
1476 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1481 struct ipv6_saddr_dst {
1482 const struct in6_addr *addr;
1489 static inline int ipv6_saddr_preferred(int type)
1491 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1496 static bool ipv6_use_optimistic_addr(struct net *net,
1497 struct inet6_dev *idev)
1499 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1502 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1504 if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic)
1513 static bool ipv6_allow_optimistic_dad(struct net *net,
1514 struct inet6_dev *idev)
1516 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1519 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1528 static int ipv6_get_saddr_eval(struct net *net,
1529 struct ipv6_saddr_score *score,
1530 struct ipv6_saddr_dst *dst,
1535 if (i <= score->rule) {
1537 case IPV6_SADDR_RULE_SCOPE:
1538 ret = score->scopedist;
1540 case IPV6_SADDR_RULE_PREFIX:
1541 ret = score->matchlen;
1544 ret = !!test_bit(i, score->scorebits);
1550 case IPV6_SADDR_RULE_INIT:
1551 /* Rule 0: remember if hiscore is not ready yet */
1554 case IPV6_SADDR_RULE_LOCAL:
1555 /* Rule 1: Prefer same address */
1556 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1558 case IPV6_SADDR_RULE_SCOPE:
1559 /* Rule 2: Prefer appropriate scope
1564 * ---+--+-+---> scope
1566 * | d is scope of the destination.
1568 * | \ <- smaller scope is better if
1569 * B-15 | \ if scope is enough for destination.
1570 * | ret = B - scope (-1 <= scope >= d <= 15).
1572 * |/ <- greater is better
1573 * -C / if scope is not enough for destination.
1574 * /| ret = scope - C (-1 <= d < scope <= 15).
1576 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1577 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1578 * Assume B = 0 and we get C > 29.
1580 ret = __ipv6_addr_src_scope(score->addr_type);
1581 if (ret >= dst->scope)
1584 ret -= 128; /* 30 is enough */
1585 score->scopedist = ret;
1587 case IPV6_SADDR_RULE_PREFERRED:
1589 /* Rule 3: Avoid deprecated and optimistic addresses */
1590 u8 avoid = IFA_F_DEPRECATED;
1592 if (!ipv6_use_optimistic_addr(net, score->ifa->idev))
1593 avoid |= IFA_F_OPTIMISTIC;
1594 ret = ipv6_saddr_preferred(score->addr_type) ||
1595 !(score->ifa->flags & avoid);
1598 #ifdef CONFIG_IPV6_MIP6
1599 case IPV6_SADDR_RULE_HOA:
1601 /* Rule 4: Prefer home address */
1602 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1603 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1607 case IPV6_SADDR_RULE_OIF:
1608 /* Rule 5: Prefer outgoing interface */
1609 ret = (!dst->ifindex ||
1610 dst->ifindex == score->ifa->idev->dev->ifindex);
1612 case IPV6_SADDR_RULE_LABEL:
1613 /* Rule 6: Prefer matching label */
1614 ret = ipv6_addr_label(net,
1615 &score->ifa->addr, score->addr_type,
1616 score->ifa->idev->dev->ifindex) == dst->label;
1618 case IPV6_SADDR_RULE_PRIVACY:
1620 /* Rule 7: Prefer public address
1621 * Note: prefer temporary address if use_tempaddr >= 2
1623 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1624 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1625 score->ifa->idev->cnf.use_tempaddr >= 2;
1626 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1629 case IPV6_SADDR_RULE_ORCHID:
1630 /* Rule 8-: Prefer ORCHID vs ORCHID or
1631 * non-ORCHID vs non-ORCHID
1633 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1634 ipv6_addr_orchid(dst->addr));
1636 case IPV6_SADDR_RULE_PREFIX:
1637 /* Rule 8: Use longest matching prefix */
1638 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1639 if (ret > score->ifa->prefix_len)
1640 ret = score->ifa->prefix_len;
1641 score->matchlen = ret;
1643 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1644 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1645 /* Optimistic addresses still have lower precedence than other
1646 * preferred addresses.
1648 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1656 __set_bit(i, score->scorebits);
1662 static int __ipv6_dev_get_saddr(struct net *net,
1663 struct ipv6_saddr_dst *dst,
1664 struct inet6_dev *idev,
1665 struct ipv6_saddr_score *scores,
1668 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1670 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) {
1674 * - Tentative Address (RFC2462 section 5.4)
1675 * - A tentative address is not considered
1676 * "assigned to an interface" in the traditional
1677 * sense, unless it is also flagged as optimistic.
1678 * - Candidate Source Address (section 4)
1679 * - In any case, anycast addresses, multicast
1680 * addresses, and the unspecified address MUST
1681 * NOT be included in a candidate set.
1683 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1684 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1687 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1689 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1690 score->addr_type & IPV6_ADDR_MULTICAST)) {
1691 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1697 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1699 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1700 int minihiscore, miniscore;
1702 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1703 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1705 if (minihiscore > miniscore) {
1706 if (i == IPV6_SADDR_RULE_SCOPE &&
1707 score->scopedist > 0) {
1710 * each remaining entry
1711 * has too small (not enough)
1712 * scope, because ifa entries
1713 * are sorted by their scope
1719 } else if (minihiscore < miniscore) {
1720 swap(hiscore, score);
1721 hiscore_idx = 1 - hiscore_idx;
1723 /* restore our iterator */
1724 score->ifa = hiscore->ifa;
1734 static int ipv6_get_saddr_master(struct net *net,
1735 const struct net_device *dst_dev,
1736 const struct net_device *master,
1737 struct ipv6_saddr_dst *dst,
1738 struct ipv6_saddr_score *scores,
1741 struct inet6_dev *idev;
1743 idev = __in6_dev_get(dst_dev);
1745 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1746 scores, hiscore_idx);
1748 idev = __in6_dev_get(master);
1750 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1751 scores, hiscore_idx);
1756 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1757 const struct in6_addr *daddr, unsigned int prefs,
1758 struct in6_addr *saddr)
1760 struct ipv6_saddr_score scores[2], *hiscore;
1761 struct ipv6_saddr_dst dst;
1762 struct inet6_dev *idev;
1763 struct net_device *dev;
1765 bool use_oif_addr = false;
1766 int hiscore_idx = 0;
1769 dst_type = __ipv6_addr_type(daddr);
1771 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1772 dst.scope = __ipv6_addr_src_scope(dst_type);
1773 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1776 scores[hiscore_idx].rule = -1;
1777 scores[hiscore_idx].ifa = NULL;
1781 /* Candidate Source Address (section 4)
1782 * - multicast and link-local destination address,
1783 * the set of candidate source address MUST only
1784 * include addresses assigned to interfaces
1785 * belonging to the same link as the outgoing
1787 * (- For site-local destination addresses, the
1788 * set of candidate source addresses MUST only
1789 * include addresses assigned to interfaces
1790 * belonging to the same site as the outgoing
1792 * - "It is RECOMMENDED that the candidate source addresses
1793 * be the set of unicast addresses assigned to the
1794 * interface that will be used to send to the destination
1795 * (the 'outgoing' interface)." (RFC 6724)
1798 idev = __in6_dev_get(dst_dev);
1799 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1800 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1801 (idev && idev->cnf.use_oif_addrs_only)) {
1802 use_oif_addr = true;
1808 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1810 const struct net_device *master;
1813 /* if dst_dev exists and is enslaved to an L3 device, then
1814 * prefer addresses from dst_dev and then the master over
1815 * any other enslaved devices in the L3 domain.
1817 master = l3mdev_master_dev_rcu(dst_dev);
1819 master_idx = master->ifindex;
1821 hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1823 scores, hiscore_idx);
1825 if (scores[hiscore_idx].ifa)
1829 for_each_netdev_rcu(net, dev) {
1830 /* only consider addresses on devices in the
1833 if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1835 idev = __in6_dev_get(dev);
1838 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1843 hiscore = &scores[hiscore_idx];
1845 ret = -EADDRNOTAVAIL;
1847 *saddr = hiscore->ifa->addr;
1852 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1854 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1857 struct inet6_ifaddr *ifp;
1858 int err = -EADDRNOTAVAIL;
1860 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1861 if (ifp->scope > IFA_LINK)
1863 if (ifp->scope == IFA_LINK &&
1864 !(ifp->flags & banned_flags)) {
1873 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1876 struct inet6_dev *idev;
1877 int err = -EADDRNOTAVAIL;
1880 idev = __in6_dev_get(dev);
1882 read_lock_bh(&idev->lock);
1883 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1884 read_unlock_bh(&idev->lock);
1890 static int ipv6_count_addresses(const struct inet6_dev *idev)
1892 const struct inet6_ifaddr *ifp;
1896 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list)
1902 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1903 const struct net_device *dev, int strict)
1905 return ipv6_chk_addr_and_flags(net, addr, dev, !dev,
1906 strict, IFA_F_TENTATIVE);
1908 EXPORT_SYMBOL(ipv6_chk_addr);
1910 /* device argument is used to find the L3 domain of interest. If
1911 * skip_dev_check is set, then the ifp device is not checked against
1912 * the passed in dev argument. So the 2 cases for addresses checks are:
1913 * 1. does the address exist in the L3 domain that dev is part of
1914 * (skip_dev_check = true), or
1916 * 2. does the address exist on the specific device
1917 * (skip_dev_check = false)
1919 static struct net_device *
1920 __ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1921 const struct net_device *dev, bool skip_dev_check,
1922 int strict, u32 banned_flags)
1924 unsigned int hash = inet6_addr_hash(net, addr);
1925 struct net_device *l3mdev, *ndev;
1926 struct inet6_ifaddr *ifp;
1931 l3mdev = l3mdev_master_dev_rcu(dev);
1935 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1936 ndev = ifp->idev->dev;
1937 if (!net_eq(dev_net(ndev), net))
1940 if (l3mdev_master_dev_rcu(ndev) != l3mdev)
1943 /* Decouple optimistic from tentative for evaluation here.
1944 * Ban optimistic addresses explicitly, when required.
1946 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1947 ? (ifp->flags&~IFA_F_TENTATIVE)
1949 if (ipv6_addr_equal(&ifp->addr, addr) &&
1950 !(ifp_flags&banned_flags) &&
1951 (!dev || ndev == dev ||
1952 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1962 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1963 const struct net_device *dev, bool skip_dev_check,
1964 int strict, u32 banned_flags)
1966 return __ipv6_chk_addr_and_flags(net, addr, dev, skip_dev_check,
1967 strict, banned_flags) ? 1 : 0;
1969 EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1972 /* Compares an address/prefix_len with addresses on device @dev.
1973 * If one is found it returns true.
1975 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1976 const unsigned int prefix_len, struct net_device *dev)
1978 const struct inet6_ifaddr *ifa;
1979 const struct inet6_dev *idev;
1983 idev = __in6_dev_get(dev);
1985 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
1986 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1995 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1997 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1999 const struct inet6_ifaddr *ifa;
2000 const struct inet6_dev *idev;
2005 idev = __in6_dev_get(dev);
2007 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
2008 onlink = ipv6_prefix_equal(addr, &ifa->addr,
2017 EXPORT_SYMBOL(ipv6_chk_prefix);
2020 * ipv6_dev_find - find the first device with a given source address.
2021 * @net: the net namespace
2022 * @addr: the source address
2024 * The caller should be protected by RCU, or RTNL.
2026 struct net_device *ipv6_dev_find(struct net *net, const struct in6_addr *addr,
2027 struct net_device *dev)
2029 return __ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1,
2032 EXPORT_SYMBOL(ipv6_dev_find);
2034 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
2035 struct net_device *dev, int strict)
2037 unsigned int hash = inet6_addr_hash(net, addr);
2038 struct inet6_ifaddr *ifp, *result = NULL;
2041 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
2042 if (!net_eq(dev_net(ifp->idev->dev), net))
2044 if (ipv6_addr_equal(&ifp->addr, addr)) {
2045 if (!dev || ifp->idev->dev == dev ||
2046 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
2047 if (in6_ifa_hold_safe(ifp)) {
2059 /* Gets referenced address, destroys ifaddr */
2061 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
2064 ifp->flags |= IFA_F_DADFAILED;
2066 if (ifp->flags&IFA_F_TEMPORARY) {
2067 struct inet6_ifaddr *ifpub;
2068 spin_lock_bh(&ifp->lock);
2071 in6_ifa_hold(ifpub);
2072 spin_unlock_bh(&ifp->lock);
2073 ipv6_create_tempaddr(ifpub, true);
2076 spin_unlock_bh(&ifp->lock);
2079 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) {
2080 spin_lock_bh(&ifp->lock);
2081 addrconf_del_dad_work(ifp);
2082 ifp->flags |= IFA_F_TENTATIVE;
2084 ifp->flags &= ~IFA_F_OPTIMISTIC;
2085 spin_unlock_bh(&ifp->lock);
2087 ipv6_ifa_notify(0, ifp);
2094 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
2098 spin_lock_bh(&ifp->lock);
2099 if (ifp->state == INET6_IFADDR_STATE_DAD) {
2100 ifp->state = INET6_IFADDR_STATE_POSTDAD;
2103 spin_unlock_bh(&ifp->lock);
2108 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp)
2110 struct inet6_dev *idev = ifp->idev;
2111 struct net *net = dev_net(ifp->idev->dev);
2113 if (addrconf_dad_end(ifp)) {
2118 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n",
2119 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source);
2121 spin_lock_bh(&ifp->lock);
2123 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
2124 struct in6_addr new_addr;
2125 struct inet6_ifaddr *ifp2;
2126 int retries = ifp->stable_privacy_retry + 1;
2127 struct ifa6_config cfg = {
2129 .plen = ifp->prefix_len,
2130 .ifa_flags = ifp->flags,
2131 .valid_lft = ifp->valid_lft,
2132 .preferred_lft = ifp->prefered_lft,
2133 .scope = ifp->scope,
2136 if (retries > net->ipv6.sysctl.idgen_retries) {
2137 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
2138 ifp->idev->dev->name);
2142 new_addr = ifp->addr;
2143 if (ipv6_generate_stable_address(&new_addr, retries,
2147 spin_unlock_bh(&ifp->lock);
2149 if (idev->cnf.max_addresses &&
2150 ipv6_count_addresses(idev) >=
2151 idev->cnf.max_addresses)
2154 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
2155 ifp->idev->dev->name);
2157 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL);
2161 spin_lock_bh(&ifp2->lock);
2162 ifp2->stable_privacy_retry = retries;
2163 ifp2->state = INET6_IFADDR_STATE_PREDAD;
2164 spin_unlock_bh(&ifp2->lock);
2166 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
2169 spin_lock_bh(&ifp->lock);
2173 /* transition from _POSTDAD to _ERRDAD */
2174 ifp->state = INET6_IFADDR_STATE_ERRDAD;
2175 spin_unlock_bh(&ifp->lock);
2177 addrconf_mod_dad_work(ifp, 0);
2181 /* Join to solicited addr multicast group.
2182 * caller must hold RTNL */
2183 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
2185 struct in6_addr maddr;
2187 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2190 addrconf_addr_solict_mult(addr, &maddr);
2191 ipv6_dev_mc_inc(dev, &maddr);
2194 /* caller must hold RTNL */
2195 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
2197 struct in6_addr maddr;
2199 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2202 addrconf_addr_solict_mult(addr, &maddr);
2203 __ipv6_dev_mc_dec(idev, &maddr);
2206 /* caller must hold RTNL */
2207 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
2209 struct in6_addr addr;
2211 if (ifp->prefix_len >= 127) /* RFC 6164 */
2213 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2214 if (ipv6_addr_any(&addr))
2216 __ipv6_dev_ac_inc(ifp->idev, &addr);
2219 /* caller must hold RTNL */
2220 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
2222 struct in6_addr addr;
2224 if (ifp->prefix_len >= 127) /* RFC 6164 */
2226 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2227 if (ipv6_addr_any(&addr))
2229 __ipv6_dev_ac_dec(ifp->idev, &addr);
2232 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev)
2234 switch (dev->addr_len) {
2236 memcpy(eui, dev->dev_addr, 3);
2239 memcpy(eui + 5, dev->dev_addr + 3, 3);
2241 case EUI64_ADDR_LEN:
2242 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2252 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2254 union fwnet_hwaddr *ha;
2256 if (dev->addr_len != FWNET_ALEN)
2259 ha = (union fwnet_hwaddr *)dev->dev_addr;
2261 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2266 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2268 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2269 if (dev->addr_len != ARCNET_ALEN)
2272 eui[7] = *(u8 *)dev->dev_addr;
2276 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2278 if (dev->addr_len != INFINIBAND_ALEN)
2280 memcpy(eui, dev->dev_addr + 12, 8);
2285 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
2289 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2290 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2291 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2292 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2293 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2294 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2298 memcpy(eui + 4, &addr, 4);
2302 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2304 if (dev->priv_flags & IFF_ISATAP)
2305 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2309 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2311 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2314 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2316 memcpy(eui, dev->perm_addr, 3);
2317 memcpy(eui + 5, dev->perm_addr + 3, 3);
2324 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2326 switch (dev->type) {
2329 return addrconf_ifid_eui48(eui, dev);
2331 return addrconf_ifid_arcnet(eui, dev);
2332 case ARPHRD_INFINIBAND:
2333 return addrconf_ifid_infiniband(eui, dev);
2335 return addrconf_ifid_sit(eui, dev);
2338 return addrconf_ifid_gre(eui, dev);
2339 case ARPHRD_6LOWPAN:
2340 return addrconf_ifid_6lowpan(eui, dev);
2341 case ARPHRD_IEEE1394:
2342 return addrconf_ifid_ieee1394(eui, dev);
2343 case ARPHRD_TUNNEL6:
2346 return addrconf_ifid_ip6tnl(eui, dev);
2351 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2354 struct inet6_ifaddr *ifp;
2356 read_lock_bh(&idev->lock);
2357 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2358 if (ifp->scope > IFA_LINK)
2360 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2361 memcpy(eui, ifp->addr.s6_addr+8, 8);
2366 read_unlock_bh(&idev->lock);
2370 /* Generation of a randomized Interface Identifier
2371 * draft-ietf-6man-rfc4941bis, Section 3.3.1
2374 static void ipv6_gen_rnd_iid(struct in6_addr *addr)
2377 get_random_bytes(&addr->s6_addr[8], 8);
2379 /* <draft-ietf-6man-rfc4941bis-08.txt>, Section 3.3.1:
2380 * check if generated address is not inappropriate:
2382 * - Reserved IPv6 Interface Identifers
2383 * - XXX: already assigned to an address on the device
2386 /* Subnet-router anycast: 0000:0000:0000:0000 */
2387 if (!(addr->s6_addr32[2] | addr->s6_addr32[3]))
2390 /* IANA Ethernet block: 0200:5EFF:FE00:0000-0200:5EFF:FE00:5212
2391 * Proxy Mobile IPv6: 0200:5EFF:FE00:5213
2392 * IANA Ethernet block: 0200:5EFF:FE00:5214-0200:5EFF:FEFF:FFFF
2394 if (ntohl(addr->s6_addr32[2]) == 0x02005eff &&
2395 (ntohl(addr->s6_addr32[3]) & 0Xff000000) == 0xfe000000)
2398 /* Reserved subnet anycast addresses */
2399 if (ntohl(addr->s6_addr32[2]) == 0xfdffffff &&
2400 ntohl(addr->s6_addr32[3]) >= 0Xffffff80)
2409 addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric,
2410 struct net_device *dev, unsigned long expires,
2411 u32 flags, gfp_t gfp_flags)
2413 struct fib6_config cfg = {
2414 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
2415 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF,
2416 .fc_ifindex = dev->ifindex,
2417 .fc_expires = expires,
2419 .fc_flags = RTF_UP | flags,
2420 .fc_nlinfo.nl_net = dev_net(dev),
2421 .fc_protocol = RTPROT_KERNEL,
2422 .fc_type = RTN_UNICAST,
2427 /* Prevent useless cloning on PtP SIT.
2428 This thing is done here expecting that the whole
2429 class of non-broadcast devices need not cloning.
2431 #if IS_ENABLED(CONFIG_IPV6_SIT)
2432 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2433 cfg.fc_flags |= RTF_NONEXTHOP;
2436 ip6_route_add(&cfg, gfp_flags, NULL);
2440 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2442 const struct net_device *dev,
2443 u32 flags, u32 noflags,
2446 struct fib6_node *fn;
2447 struct fib6_info *rt = NULL;
2448 struct fib6_table *table;
2449 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
2451 table = fib6_get_table(dev_net(dev), tb_id);
2456 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true);
2460 for_each_fib6_node_rt_rcu(fn) {
2461 /* prefix routes only use builtin fib6_nh */
2465 if (rt->fib6_nh->fib_nh_dev->ifindex != dev->ifindex)
2467 if (no_gw && rt->fib6_nh->fib_nh_gw_family)
2469 if ((rt->fib6_flags & flags) != flags)
2471 if ((rt->fib6_flags & noflags) != 0)
2473 if (!fib6_info_hold_safe(rt))
2483 /* Create "default" multicast route to the interface */
2485 static void addrconf_add_mroute(struct net_device *dev)
2487 struct fib6_config cfg = {
2488 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2489 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2490 .fc_ifindex = dev->ifindex,
2493 .fc_type = RTN_MULTICAST,
2494 .fc_nlinfo.nl_net = dev_net(dev),
2495 .fc_protocol = RTPROT_KERNEL,
2498 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2500 ip6_route_add(&cfg, GFP_KERNEL, NULL);
2503 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2505 struct inet6_dev *idev;
2509 idev = ipv6_find_idev(dev);
2513 if (idev->cnf.disable_ipv6)
2514 return ERR_PTR(-EACCES);
2516 /* Add default multicast route */
2517 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
2518 addrconf_add_mroute(dev);
2523 static void manage_tempaddrs(struct inet6_dev *idev,
2524 struct inet6_ifaddr *ifp,
2525 __u32 valid_lft, __u32 prefered_lft,
2526 bool create, unsigned long now)
2529 struct inet6_ifaddr *ift;
2531 read_lock_bh(&idev->lock);
2532 /* update all temporary addresses in the list */
2533 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2534 int age, max_valid, max_prefered;
2536 if (ifp != ift->ifpub)
2539 /* RFC 4941 section 3.3:
2540 * If a received option will extend the lifetime of a public
2541 * address, the lifetimes of temporary addresses should
2542 * be extended, subject to the overall constraint that no
2543 * temporary addresses should ever remain "valid" or "preferred"
2544 * for a time longer than (TEMP_VALID_LIFETIME) or
2545 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2547 age = (now - ift->cstamp) / HZ;
2548 max_valid = idev->cnf.temp_valid_lft - age;
2552 max_prefered = idev->cnf.temp_prefered_lft -
2553 idev->desync_factor - age;
2554 if (max_prefered < 0)
2557 if (valid_lft > max_valid)
2558 valid_lft = max_valid;
2560 if (prefered_lft > max_prefered)
2561 prefered_lft = max_prefered;
2563 spin_lock(&ift->lock);
2565 ift->valid_lft = valid_lft;
2566 ift->prefered_lft = prefered_lft;
2568 if (prefered_lft > 0)
2569 ift->flags &= ~IFA_F_DEPRECATED;
2571 spin_unlock(&ift->lock);
2572 if (!(flags&IFA_F_TENTATIVE))
2573 ipv6_ifa_notify(0, ift);
2576 /* Also create a temporary address if it's enabled but no temporary
2577 * address currently exists.
2578 * However, we get called with valid_lft == 0, prefered_lft == 0, create == false
2579 * as part of cleanup (ie. deleting the mngtmpaddr).
2580 * We don't want that to result in creating a new temporary ip address.
2582 if (list_empty(&idev->tempaddr_list) && (valid_lft || prefered_lft))
2585 if (create && idev->cnf.use_tempaddr > 0) {
2586 /* When a new public address is created as described
2587 * in [ADDRCONF], also create a new temporary address.
2589 read_unlock_bh(&idev->lock);
2590 ipv6_create_tempaddr(ifp, false);
2592 read_unlock_bh(&idev->lock);
2596 static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2598 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2599 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2602 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2603 const struct prefix_info *pinfo,
2604 struct inet6_dev *in6_dev,
2605 const struct in6_addr *addr, int addr_type,
2606 u32 addr_flags, bool sllao, bool tokenized,
2607 __u32 valid_lft, u32 prefered_lft)
2609 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2610 int create = 0, update_lft = 0;
2612 if (!ifp && valid_lft) {
2613 int max_addresses = in6_dev->cnf.max_addresses;
2614 struct ifa6_config cfg = {
2616 .plen = pinfo->prefix_len,
2617 .ifa_flags = addr_flags,
2618 .valid_lft = valid_lft,
2619 .preferred_lft = prefered_lft,
2620 .scope = addr_type & IPV6_ADDR_SCOPE_MASK,
2623 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2624 if ((net->ipv6.devconf_all->optimistic_dad ||
2625 in6_dev->cnf.optimistic_dad) &&
2626 !net->ipv6.devconf_all->forwarding && sllao)
2627 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
2630 /* Do not allow to create too much of autoconfigured
2631 * addresses; this would be too easy way to crash kernel.
2633 if (!max_addresses ||
2634 ipv6_count_addresses(in6_dev) < max_addresses)
2635 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL);
2637 if (IS_ERR_OR_NULL(ifp))
2641 spin_lock_bh(&ifp->lock);
2642 ifp->flags |= IFA_F_MANAGETEMPADDR;
2643 ifp->cstamp = jiffies;
2644 ifp->tokenized = tokenized;
2645 spin_unlock_bh(&ifp->lock);
2646 addrconf_dad_start(ifp);
2654 /* update lifetime (RFC2462 5.5.3 e) */
2655 spin_lock_bh(&ifp->lock);
2657 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2658 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2661 if (!create && stored_lft) {
2662 const u32 minimum_lft = min_t(u32,
2663 stored_lft, MIN_VALID_LIFETIME);
2664 valid_lft = max(valid_lft, minimum_lft);
2666 /* RFC4862 Section 5.5.3e:
2667 * "Note that the preferred lifetime of the
2668 * corresponding address is always reset to
2669 * the Preferred Lifetime in the received
2670 * Prefix Information option, regardless of
2671 * whether the valid lifetime is also reset or
2674 * So we should always update prefered_lft here.
2680 ifp->valid_lft = valid_lft;
2681 ifp->prefered_lft = prefered_lft;
2684 ifp->flags &= ~IFA_F_DEPRECATED;
2685 spin_unlock_bh(&ifp->lock);
2687 if (!(flags&IFA_F_TENTATIVE))
2688 ipv6_ifa_notify(0, ifp);
2690 spin_unlock_bh(&ifp->lock);
2692 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2701 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
2703 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2705 struct prefix_info *pinfo;
2710 struct inet6_dev *in6_dev;
2711 struct net *net = dev_net(dev);
2713 pinfo = (struct prefix_info *) opt;
2715 if (len < sizeof(struct prefix_info)) {
2716 netdev_dbg(dev, "addrconf: prefix option too short\n");
2721 * Validation checks ([ADDRCONF], page 19)
2724 addr_type = ipv6_addr_type(&pinfo->prefix);
2726 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2729 valid_lft = ntohl(pinfo->valid);
2730 prefered_lft = ntohl(pinfo->prefered);
2732 if (prefered_lft > valid_lft) {
2733 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2737 in6_dev = in6_dev_get(dev);
2740 net_dbg_ratelimited("addrconf: device %s not configured\n",
2745 if (valid_lft != 0 && valid_lft < in6_dev->cnf.accept_ra_min_lft)
2749 * Two things going on here:
2750 * 1) Add routes for on-link prefixes
2751 * 2) Configure prefixes with the auto flag set
2754 if (pinfo->onlink) {
2755 struct fib6_info *rt;
2756 unsigned long rt_expires;
2758 /* Avoid arithmetic overflow. Really, we could
2759 * save rt_expires in seconds, likely valid_lft,
2760 * but it would require division in fib gc, that it
2764 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2766 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2768 if (addrconf_finite_timeout(rt_expires))
2771 rt = addrconf_get_prefix_route(&pinfo->prefix,
2774 RTF_ADDRCONF | RTF_PREFIX_RT,
2778 /* Autoconf prefix route */
2779 if (valid_lft == 0) {
2780 ip6_del_rt(net, rt, false);
2782 } else if (addrconf_finite_timeout(rt_expires)) {
2784 fib6_set_expires(rt, jiffies + rt_expires);
2786 fib6_clean_expires(rt);
2788 } else if (valid_lft) {
2789 clock_t expires = 0;
2790 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2791 if (addrconf_finite_timeout(rt_expires)) {
2793 flags |= RTF_EXPIRES;
2794 expires = jiffies_to_clock_t(rt_expires);
2796 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2797 0, dev, expires, flags,
2800 fib6_info_release(rt);
2803 /* Try to figure out our local address for this prefix */
2805 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2806 struct in6_addr addr;
2807 bool tokenized = false, dev_addr_generated = false;
2809 if (pinfo->prefix_len == 64) {
2810 memcpy(&addr, &pinfo->prefix, 8);
2812 if (!ipv6_addr_any(&in6_dev->token)) {
2813 read_lock_bh(&in6_dev->lock);
2814 memcpy(addr.s6_addr + 8,
2815 in6_dev->token.s6_addr + 8, 8);
2816 read_unlock_bh(&in6_dev->lock);
2818 } else if (is_addr_mode_generate_stable(in6_dev) &&
2819 !ipv6_generate_stable_address(&addr, 0,
2821 addr_flags |= IFA_F_STABLE_PRIVACY;
2823 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2824 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2827 dev_addr_generated = true;
2831 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2836 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2839 tokenized, valid_lft,
2844 /* Ignore error case here because previous prefix add addr was
2845 * successful which will be notified.
2847 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2848 addr_type, addr_flags, sllao,
2849 tokenized, valid_lft,
2851 dev_addr_generated);
2853 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2855 in6_dev_put(in6_dev);
2858 static int addrconf_set_sit_dstaddr(struct net *net, struct net_device *dev,
2859 struct in6_ifreq *ireq)
2861 struct ip_tunnel_parm p = { };
2864 if (!(ipv6_addr_type(&ireq->ifr6_addr) & IPV6_ADDR_COMPATv4))
2865 return -EADDRNOTAVAIL;
2867 p.iph.daddr = ireq->ifr6_addr.s6_addr32[3];
2870 p.iph.protocol = IPPROTO_IPV6;
2873 if (!dev->netdev_ops->ndo_tunnel_ctl)
2875 err = dev->netdev_ops->ndo_tunnel_ctl(dev, &p, SIOCADDTUNNEL);
2879 dev = __dev_get_by_name(net, p.name);
2882 return dev_open(dev, NULL);
2886 * Set destination address.
2887 * Special case for SIT interfaces where we create a new "virtual"
2890 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2892 struct net_device *dev;
2893 struct in6_ifreq ireq;
2896 if (!IS_ENABLED(CONFIG_IPV6_SIT))
2898 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2902 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2903 if (dev && dev->type == ARPHRD_SIT)
2904 err = addrconf_set_sit_dstaddr(net, dev, &ireq);
2909 static int ipv6_mc_config(struct sock *sk, bool join,
2910 const struct in6_addr *addr, int ifindex)
2918 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2920 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2927 * Manual configuration of address on an interface
2929 static int inet6_addr_add(struct net *net, int ifindex,
2930 struct ifa6_config *cfg,
2931 struct netlink_ext_ack *extack)
2933 struct inet6_ifaddr *ifp;
2934 struct inet6_dev *idev;
2935 struct net_device *dev;
2936 unsigned long timeout;
2942 if (cfg->plen > 128)
2945 /* check the lifetime */
2946 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
2949 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64)
2952 dev = __dev_get_by_index(net, ifindex);
2956 idev = addrconf_add_dev(dev);
2958 return PTR_ERR(idev);
2960 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
2961 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2962 true, cfg->pfx, ifindex);
2968 cfg->scope = ipv6_addr_scope(cfg->pfx);
2970 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
2971 if (addrconf_finite_timeout(timeout)) {
2972 expires = jiffies_to_clock_t(timeout * HZ);
2973 cfg->valid_lft = timeout;
2974 flags = RTF_EXPIRES;
2978 cfg->ifa_flags |= IFA_F_PERMANENT;
2981 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
2982 if (addrconf_finite_timeout(timeout)) {
2984 cfg->ifa_flags |= IFA_F_DEPRECATED;
2985 cfg->preferred_lft = timeout;
2988 ifp = ipv6_add_addr(idev, cfg, true, extack);
2990 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
2991 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
2992 ifp->rt_priority, dev, expires,
2996 /* Send a netlink notification if DAD is enabled and
2997 * optimistic flag is not set
2999 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD)))
3000 ipv6_ifa_notify(0, ifp);
3002 * Note that section 3.1 of RFC 4429 indicates
3003 * that the Optimistic flag should not be set for
3004 * manually configured addresses
3006 addrconf_dad_start(ifp);
3007 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR)
3008 manage_tempaddrs(idev, ifp, cfg->valid_lft,
3009 cfg->preferred_lft, true, jiffies);
3011 addrconf_verify_rtnl();
3013 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
3014 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false,
3018 return PTR_ERR(ifp);
3021 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
3022 const struct in6_addr *pfx, unsigned int plen)
3024 struct inet6_ifaddr *ifp;
3025 struct inet6_dev *idev;
3026 struct net_device *dev;
3031 dev = __dev_get_by_index(net, ifindex);
3035 idev = __in6_dev_get(dev);
3039 read_lock_bh(&idev->lock);
3040 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3041 if (ifp->prefix_len == plen &&
3042 ipv6_addr_equal(pfx, &ifp->addr)) {
3044 read_unlock_bh(&idev->lock);
3046 if (!(ifp->flags & IFA_F_TEMPORARY) &&
3047 (ifa_flags & IFA_F_MANAGETEMPADDR))
3048 manage_tempaddrs(idev, ifp, 0, 0, false,
3051 addrconf_verify_rtnl();
3052 if (ipv6_addr_is_multicast(pfx)) {
3053 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
3054 false, pfx, dev->ifindex);
3059 read_unlock_bh(&idev->lock);
3060 return -EADDRNOTAVAIL;
3064 int addrconf_add_ifaddr(struct net *net, void __user *arg)
3066 struct ifa6_config cfg = {
3067 .ifa_flags = IFA_F_PERMANENT,
3068 .preferred_lft = INFINITY_LIFE_TIME,
3069 .valid_lft = INFINITY_LIFE_TIME,
3071 struct in6_ifreq ireq;
3074 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3077 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3080 cfg.pfx = &ireq.ifr6_addr;
3081 cfg.plen = ireq.ifr6_prefixlen;
3084 err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL);
3089 int addrconf_del_ifaddr(struct net *net, void __user *arg)
3091 struct in6_ifreq ireq;
3094 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3097 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3101 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
3102 ireq.ifr6_prefixlen);
3107 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
3108 int plen, int scope)
3110 struct inet6_ifaddr *ifp;
3111 struct ifa6_config cfg = {
3114 .ifa_flags = IFA_F_PERMANENT,
3115 .valid_lft = INFINITY_LIFE_TIME,
3116 .preferred_lft = INFINITY_LIFE_TIME,
3120 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
3122 spin_lock_bh(&ifp->lock);
3123 ifp->flags &= ~IFA_F_TENTATIVE;
3124 spin_unlock_bh(&ifp->lock);
3125 rt_genid_bump_ipv6(dev_net(idev->dev));
3126 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3131 #if IS_ENABLED(CONFIG_IPV6_SIT)
3132 static void sit_add_v4_addrs(struct inet6_dev *idev)
3134 struct in6_addr addr;
3135 struct net_device *dev;
3136 struct net *net = dev_net(idev->dev);
3142 memset(&addr, 0, sizeof(struct in6_addr));
3143 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
3145 if (idev->dev->flags&IFF_POINTOPOINT) {
3146 if (idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_NONE)
3149 addr.s6_addr32[0] = htonl(0xfe800000);
3153 scope = IPV6_ADDR_COMPATv4;
3155 pflags |= RTF_NONEXTHOP;
3158 if (addr.s6_addr32[3]) {
3159 add_addr(idev, &addr, plen, scope);
3160 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags,
3165 for_each_netdev(net, dev) {
3166 struct in_device *in_dev = __in_dev_get_rtnl(dev);
3167 if (in_dev && (dev->flags & IFF_UP)) {
3168 struct in_ifaddr *ifa;
3171 in_dev_for_each_ifa_rtnl(ifa, in_dev) {
3172 addr.s6_addr32[3] = ifa->ifa_local;
3174 if (ifa->ifa_scope == RT_SCOPE_LINK)
3176 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
3177 if (idev->dev->flags&IFF_POINTOPOINT)
3182 add_addr(idev, &addr, plen, flag);
3183 addrconf_prefix_route(&addr, plen, 0, idev->dev,
3184 0, pflags, GFP_KERNEL);
3191 static void init_loopback(struct net_device *dev)
3193 struct inet6_dev *idev;
3199 idev = ipv6_find_idev(dev);
3201 pr_debug("%s: add_dev failed\n", __func__);
3205 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
3208 void addrconf_add_linklocal(struct inet6_dev *idev,
3209 const struct in6_addr *addr, u32 flags)
3211 struct ifa6_config cfg = {
3214 .ifa_flags = flags | IFA_F_PERMANENT,
3215 .valid_lft = INFINITY_LIFE_TIME,
3216 .preferred_lft = INFINITY_LIFE_TIME,
3219 struct inet6_ifaddr *ifp;
3221 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3222 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad ||
3223 idev->cnf.optimistic_dad) &&
3224 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
3225 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
3228 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
3230 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev,
3232 addrconf_dad_start(ifp);
3236 EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
3238 static bool ipv6_reserved_interfaceid(struct in6_addr address)
3240 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3243 if (address.s6_addr32[2] == htonl(0x02005eff) &&
3244 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3247 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3248 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3254 static int ipv6_generate_stable_address(struct in6_addr *address,
3256 const struct inet6_dev *idev)
3258 static DEFINE_SPINLOCK(lock);
3259 static __u32 digest[SHA1_DIGEST_WORDS];
3260 static __u32 workspace[SHA1_WORKSPACE_WORDS];
3263 char __data[SHA1_BLOCK_SIZE];
3265 struct in6_addr secret;
3267 unsigned char hwaddr[MAX_ADDR_LEN];
3272 struct in6_addr secret;
3273 struct in6_addr temp;
3274 struct net *net = dev_net(idev->dev);
3276 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3278 if (idev->cnf.stable_secret.initialized)
3279 secret = idev->cnf.stable_secret.secret;
3280 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3281 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3286 spin_lock_bh(&lock);
3289 memset(&data, 0, sizeof(data));
3290 memset(workspace, 0, sizeof(workspace));
3291 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3292 data.prefix[0] = address->s6_addr32[0];
3293 data.prefix[1] = address->s6_addr32[1];
3294 data.secret = secret;
3295 data.dad_count = dad_count;
3297 sha1_transform(digest, data.__data, workspace);
3300 temp.s6_addr32[2] = (__force __be32)digest[0];
3301 temp.s6_addr32[3] = (__force __be32)digest[1];
3303 spin_unlock_bh(&lock);
3305 if (ipv6_reserved_interfaceid(temp)) {
3307 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3316 static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3318 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3322 s = &idev->cnf.stable_secret;
3323 get_random_bytes(&s->secret, sizeof(s->secret));
3324 s->initialized = true;
3327 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3329 struct in6_addr addr;
3331 /* no link local addresses on L3 master devices */
3332 if (netif_is_l3_master(idev->dev))
3335 /* no link local addresses on devices flagged as slaves */
3336 if (idev->dev->flags & IFF_SLAVE)
3339 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3341 switch (idev->cnf.addr_gen_mode) {
3342 case IN6_ADDR_GEN_MODE_RANDOM:
3343 ipv6_gen_mode_random_init(idev);
3345 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
3346 if (!ipv6_generate_stable_address(&addr, 0, idev))
3347 addrconf_add_linklocal(idev, &addr,
3348 IFA_F_STABLE_PRIVACY);
3349 else if (prefix_route)
3350 addrconf_prefix_route(&addr, 64, 0, idev->dev,
3353 case IN6_ADDR_GEN_MODE_EUI64:
3354 /* addrconf_add_linklocal also adds a prefix_route and we
3355 * only need to care about prefix routes if ipv6_generate_eui64
3356 * couldn't generate one.
3358 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3359 addrconf_add_linklocal(idev, &addr, 0);
3360 else if (prefix_route)
3361 addrconf_prefix_route(&addr, 64, 0, idev->dev,
3364 case IN6_ADDR_GEN_MODE_NONE:
3366 /* will not add any link local address */
3371 static void addrconf_dev_config(struct net_device *dev)
3373 struct inet6_dev *idev;
3377 if ((dev->type != ARPHRD_ETHER) &&
3378 (dev->type != ARPHRD_FDDI) &&
3379 (dev->type != ARPHRD_ARCNET) &&
3380 (dev->type != ARPHRD_INFINIBAND) &&
3381 (dev->type != ARPHRD_IEEE1394) &&
3382 (dev->type != ARPHRD_TUNNEL6) &&
3383 (dev->type != ARPHRD_6LOWPAN) &&
3384 (dev->type != ARPHRD_IP6GRE) &&
3385 (dev->type != ARPHRD_IPGRE) &&
3386 (dev->type != ARPHRD_TUNNEL) &&
3387 (dev->type != ARPHRD_NONE) &&
3388 (dev->type != ARPHRD_RAWIP)) {
3389 /* Alas, we support only Ethernet autoconfiguration. */
3390 idev = __in6_dev_get(dev);
3391 if (!IS_ERR_OR_NULL(idev) && dev->flags & IFF_UP &&
3392 dev->flags & IFF_MULTICAST)
3397 idev = addrconf_add_dev(dev);
3401 /* this device type has no EUI support */
3402 if (dev->type == ARPHRD_NONE &&
3403 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3404 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
3406 addrconf_addr_gen(idev, false);
3409 #if IS_ENABLED(CONFIG_IPV6_SIT)
3410 static void addrconf_sit_config(struct net_device *dev)
3412 struct inet6_dev *idev;
3417 * Configure the tunnel with one of our IPv4
3418 * addresses... we should configure all of
3419 * our v4 addrs in the tunnel
3422 idev = ipv6_find_idev(dev);
3424 pr_debug("%s: add_dev failed\n", __func__);
3428 if (dev->priv_flags & IFF_ISATAP) {
3429 addrconf_addr_gen(idev, false);
3433 sit_add_v4_addrs(idev);
3435 if (dev->flags&IFF_POINTOPOINT)
3436 addrconf_add_mroute(dev);
3440 #if IS_ENABLED(CONFIG_NET_IPGRE)
3441 static void addrconf_gre_config(struct net_device *dev)
3443 struct inet6_dev *idev;
3447 idev = ipv6_find_idev(dev);
3449 pr_debug("%s: add_dev failed\n", __func__);
3453 addrconf_addr_gen(idev, true);
3454 if (dev->flags & IFF_POINTOPOINT)
3455 addrconf_add_mroute(dev);
3459 static int fixup_permanent_addr(struct net *net,
3460 struct inet6_dev *idev,
3461 struct inet6_ifaddr *ifp)
3463 /* !fib6_node means the host route was removed from the
3464 * FIB, for example, if 'lo' device is taken down. In that
3465 * case regenerate the host route.
3467 if (!ifp->rt || !ifp->rt->fib6_node) {
3468 struct fib6_info *f6i, *prev;
3470 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false,
3473 return PTR_ERR(f6i);
3475 /* ifp->rt can be accessed outside of rtnl */
3476 spin_lock(&ifp->lock);
3479 spin_unlock(&ifp->lock);
3481 fib6_info_release(prev);
3484 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3485 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3486 ifp->rt_priority, idev->dev, 0, 0,
3490 if (ifp->state == INET6_IFADDR_STATE_PREDAD)
3491 addrconf_dad_start(ifp);
3496 static void addrconf_permanent_addr(struct net *net, struct net_device *dev)
3498 struct inet6_ifaddr *ifp, *tmp;
3499 struct inet6_dev *idev;
3501 idev = __in6_dev_get(dev);
3505 write_lock_bh(&idev->lock);
3507 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3508 if ((ifp->flags & IFA_F_PERMANENT) &&
3509 fixup_permanent_addr(net, idev, ifp) < 0) {
3510 write_unlock_bh(&idev->lock);
3513 write_lock_bh(&idev->lock);
3515 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3516 idev->dev->name, &ifp->addr);
3520 write_unlock_bh(&idev->lock);
3523 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3526 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3527 struct netdev_notifier_change_info *change_info;
3528 struct netdev_notifier_changeupper_info *info;
3529 struct inet6_dev *idev = __in6_dev_get(dev);
3530 struct net *net = dev_net(dev);
3531 int run_pending = 0;
3535 case NETDEV_REGISTER:
3536 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3537 idev = ipv6_add_dev(dev);
3539 return notifier_from_errno(PTR_ERR(idev));
3543 case NETDEV_CHANGEMTU:
3544 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3545 if (dev->mtu < IPV6_MIN_MTU) {
3546 addrconf_ifdown(dev, dev != net->loopback_dev);
3551 rt6_mtu_change(dev, dev->mtu);
3552 idev->cnf.mtu6 = dev->mtu;
3556 /* allocate new idev */
3557 idev = ipv6_add_dev(dev);
3561 /* device is still not ready */
3562 if (!(idev->if_flags & IF_READY))
3569 if (dev->flags & IFF_SLAVE)
3572 if (idev && idev->cnf.disable_ipv6)
3575 if (event == NETDEV_UP) {
3576 /* restore routes for permanent addresses */
3577 addrconf_permanent_addr(net, dev);
3579 if (!addrconf_link_ready(dev)) {
3580 /* device is not ready yet. */
3581 pr_debug("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3586 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3587 idev = ipv6_add_dev(dev);
3589 if (!IS_ERR_OR_NULL(idev)) {
3590 idev->if_flags |= IF_READY;
3593 } else if (event == NETDEV_CHANGE) {
3594 if (!addrconf_link_ready(dev)) {
3595 /* device is still not ready. */
3596 rt6_sync_down_dev(dev, event);
3600 if (!IS_ERR_OR_NULL(idev)) {
3601 if (idev->if_flags & IF_READY) {
3602 /* device is already configured -
3603 * but resend MLD reports, we might
3604 * have roamed and need to update
3605 * multicast snooping switches
3609 if (change_info->flags_changed & IFF_NOARP)
3610 addrconf_dad_run(idev, true);
3611 rt6_sync_up(dev, RTNH_F_LINKDOWN);
3614 idev->if_flags |= IF_READY;
3617 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3623 switch (dev->type) {
3624 #if IS_ENABLED(CONFIG_IPV6_SIT)
3626 addrconf_sit_config(dev);
3629 #if IS_ENABLED(CONFIG_NET_IPGRE)
3631 addrconf_gre_config(dev);
3634 case ARPHRD_LOOPBACK:
3639 addrconf_dev_config(dev);
3643 if (!IS_ERR_OR_NULL(idev)) {
3645 addrconf_dad_run(idev, false);
3647 /* Device has an address by now */
3648 rt6_sync_up(dev, RTNH_F_DEAD);
3651 * If the MTU changed during the interface down,
3652 * when the interface up, the changed MTU must be
3653 * reflected in the idev as well as routers.
3655 if (idev->cnf.mtu6 != dev->mtu &&
3656 dev->mtu >= IPV6_MIN_MTU) {
3657 rt6_mtu_change(dev, dev->mtu);
3658 idev->cnf.mtu6 = dev->mtu;
3660 idev->tstamp = jiffies;
3661 inet6_ifinfo_notify(RTM_NEWLINK, idev);
3664 * If the changed mtu during down is lower than
3665 * IPV6_MIN_MTU stop IPv6 on this interface.
3667 if (dev->mtu < IPV6_MIN_MTU)
3668 addrconf_ifdown(dev, dev != net->loopback_dev);
3673 case NETDEV_UNREGISTER:
3675 * Remove all addresses from this interface.
3677 addrconf_ifdown(dev, event != NETDEV_DOWN);
3680 case NETDEV_CHANGENAME:
3682 snmp6_unregister_dev(idev);
3683 addrconf_sysctl_unregister(idev);
3684 err = addrconf_sysctl_register(idev);
3686 return notifier_from_errno(err);
3687 err = snmp6_register_dev(idev);
3689 addrconf_sysctl_unregister(idev);
3690 return notifier_from_errno(err);
3695 case NETDEV_PRE_TYPE_CHANGE:
3696 case NETDEV_POST_TYPE_CHANGE:
3698 addrconf_type_change(dev, event);
3701 case NETDEV_CHANGEUPPER:
3704 /* flush all routes if dev is linked to or unlinked from
3705 * an L3 master device (e.g., VRF)
3707 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3708 addrconf_ifdown(dev, false);
3715 * addrconf module should be notified of a device going up
3717 static struct notifier_block ipv6_dev_notf = {
3718 .notifier_call = addrconf_notify,
3719 .priority = ADDRCONF_NOTIFY_PRIORITY,
3722 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3724 struct inet6_dev *idev;
3727 idev = __in6_dev_get(dev);
3729 if (event == NETDEV_POST_TYPE_CHANGE)
3730 ipv6_mc_remap(idev);
3731 else if (event == NETDEV_PRE_TYPE_CHANGE)
3732 ipv6_mc_unmap(idev);
3735 static bool addr_is_local(const struct in6_addr *addr)
3737 return ipv6_addr_type(addr) &
3738 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3741 static int addrconf_ifdown(struct net_device *dev, bool unregister)
3743 unsigned long event = unregister ? NETDEV_UNREGISTER : NETDEV_DOWN;
3744 struct net *net = dev_net(dev);
3745 struct inet6_dev *idev;
3746 struct inet6_ifaddr *ifa;
3747 LIST_HEAD(tmp_addr_list);
3748 bool keep_addr = false;
3754 rt6_disable_ip(dev, event);
3756 idev = __in6_dev_get(dev);
3761 * Step 1: remove reference to ipv6 device from parent device.
3767 /* protected by rtnl_lock */
3768 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3770 /* Step 1.5: remove snmp6 entry */
3771 snmp6_unregister_dev(idev);
3775 /* combine the user config with event to determine if permanent
3776 * addresses are to be removed from address hash table
3778 if (!unregister && !idev->cnf.disable_ipv6) {
3779 /* aggregate the system setting and interface setting */
3780 int _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3783 _keep_addr = idev->cnf.keep_addr_on_down;
3785 keep_addr = (_keep_addr > 0);
3788 /* Step 2: clear hash table */
3789 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3790 struct hlist_head *h = &inet6_addr_lst[i];
3792 spin_lock_bh(&addrconf_hash_lock);
3794 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3795 if (ifa->idev == idev) {
3796 addrconf_del_dad_work(ifa);
3797 /* combined flag + permanent flag decide if
3798 * address is retained on a down event
3801 !(ifa->flags & IFA_F_PERMANENT) ||
3802 addr_is_local(&ifa->addr)) {
3803 hlist_del_init_rcu(&ifa->addr_lst);
3808 spin_unlock_bh(&addrconf_hash_lock);
3811 write_lock_bh(&idev->lock);
3813 addrconf_del_rs_timer(idev);
3815 /* Step 2: clear flags for stateless addrconf, repeated down
3818 was_ready = idev->if_flags & IF_READY;
3820 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3822 /* Step 3: clear tempaddr list */
3823 while (!list_empty(&idev->tempaddr_list)) {
3824 ifa = list_first_entry(&idev->tempaddr_list,
3825 struct inet6_ifaddr, tmp_list);
3826 list_del(&ifa->tmp_list);
3827 write_unlock_bh(&idev->lock);
3828 spin_lock_bh(&ifa->lock);
3831 in6_ifa_put(ifa->ifpub);
3834 spin_unlock_bh(&ifa->lock);
3836 write_lock_bh(&idev->lock);
3839 list_for_each_entry(ifa, &idev->addr_list, if_list)
3840 list_add_tail(&ifa->if_list_aux, &tmp_addr_list);
3841 write_unlock_bh(&idev->lock);
3843 while (!list_empty(&tmp_addr_list)) {
3844 struct fib6_info *rt = NULL;
3847 ifa = list_first_entry(&tmp_addr_list,
3848 struct inet6_ifaddr, if_list_aux);
3849 list_del(&ifa->if_list_aux);
3851 addrconf_del_dad_work(ifa);
3853 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3854 !addr_is_local(&ifa->addr);
3856 spin_lock_bh(&ifa->lock);
3859 /* set state to skip the notifier below */
3860 state = INET6_IFADDR_STATE_DEAD;
3861 ifa->state = INET6_IFADDR_STATE_PREDAD;
3862 if (!(ifa->flags & IFA_F_NODAD))
3863 ifa->flags |= IFA_F_TENTATIVE;
3869 ifa->state = INET6_IFADDR_STATE_DEAD;
3872 spin_unlock_bh(&ifa->lock);
3875 ip6_del_rt(net, rt, false);
3877 if (state != INET6_IFADDR_STATE_DEAD) {
3878 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3879 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3881 if (idev->cnf.forwarding)
3882 addrconf_leave_anycast(ifa);
3883 addrconf_leave_solict(ifa->idev, &ifa->addr);
3887 write_lock_bh(&idev->lock);
3888 list_del_rcu(&ifa->if_list);
3889 write_unlock_bh(&idev->lock);
3894 /* Step 5: Discard anycast and multicast list */
3896 ipv6_ac_destroy_dev(idev);
3897 ipv6_mc_destroy_dev(idev);
3898 } else if (was_ready) {
3902 idev->tstamp = jiffies;
3904 /* Last: Shot the device (if unregistered) */
3906 addrconf_sysctl_unregister(idev);
3907 neigh_parms_release(&nd_tbl, idev->nd_parms);
3908 neigh_ifdown(&nd_tbl, dev);
3914 static void addrconf_rs_timer(struct timer_list *t)
3916 struct inet6_dev *idev = from_timer(idev, t, rs_timer);
3917 struct net_device *dev = idev->dev;
3918 struct in6_addr lladdr;
3920 write_lock(&idev->lock);
3921 if (idev->dead || !(idev->if_flags & IF_READY))
3924 if (!ipv6_accept_ra(idev))
3927 /* Announcement received after solicitation was sent */
3928 if (idev->if_flags & IF_RA_RCVD)
3931 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
3932 write_unlock(&idev->lock);
3933 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3934 ndisc_send_rs(dev, &lladdr,
3935 &in6addr_linklocal_allrouters);
3939 write_lock(&idev->lock);
3940 idev->rs_interval = rfc3315_s14_backoff_update(
3941 idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
3942 /* The wait after the last probe can be shorter */
3943 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3944 idev->cnf.rtr_solicits) ?
3945 idev->cnf.rtr_solicit_delay :
3949 * Note: we do not support deprecated "all on-link"
3950 * assumption any longer.
3952 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3956 write_unlock(&idev->lock);
3962 * Duplicate Address Detection
3964 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3966 unsigned long rand_num;
3967 struct inet6_dev *idev = ifp->idev;
3970 if (ifp->flags & IFA_F_OPTIMISTIC)
3973 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3976 if (idev->cnf.enhanced_dad ||
3977 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) {
3979 get_random_bytes(&nonce, 6);
3982 ifp->dad_nonce = nonce;
3983 ifp->dad_probes = idev->cnf.dad_transmits;
3984 addrconf_mod_dad_work(ifp, rand_num);
3987 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3989 struct inet6_dev *idev = ifp->idev;
3990 struct net_device *dev = idev->dev;
3991 bool bump_id, notify = false;
3994 addrconf_join_solict(dev, &ifp->addr);
3996 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3998 read_lock_bh(&idev->lock);
3999 spin_lock(&ifp->lock);
4000 if (ifp->state == INET6_IFADDR_STATE_DEAD)
4004 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
4005 (net->ipv6.devconf_all->accept_dad < 1 &&
4006 idev->cnf.accept_dad < 1) ||
4007 !(ifp->flags&IFA_F_TENTATIVE) ||
4008 ifp->flags & IFA_F_NODAD) {
4009 bool send_na = false;
4011 if (ifp->flags & IFA_F_TENTATIVE &&
4012 !(ifp->flags & IFA_F_OPTIMISTIC))
4014 bump_id = ifp->flags & IFA_F_TENTATIVE;
4015 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
4016 spin_unlock(&ifp->lock);
4017 read_unlock_bh(&idev->lock);
4019 addrconf_dad_completed(ifp, bump_id, send_na);
4023 if (!(idev->if_flags & IF_READY)) {
4024 spin_unlock(&ifp->lock);
4025 read_unlock_bh(&idev->lock);
4027 * If the device is not ready:
4028 * - keep it tentative if it is a permanent address.
4029 * - otherwise, kill it.
4032 addrconf_dad_stop(ifp, 0);
4037 * Optimistic nodes can start receiving
4040 if (ifp->flags & IFA_F_OPTIMISTIC) {
4041 ip6_ins_rt(net, ifp->rt);
4042 if (ipv6_use_optimistic_addr(net, idev)) {
4043 /* Because optimistic nodes can use this address,
4044 * notify listeners. If DAD fails, RTM_DELADDR is sent.
4050 addrconf_dad_kick(ifp);
4052 spin_unlock(&ifp->lock);
4053 read_unlock_bh(&idev->lock);
4055 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4058 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
4060 bool begin_dad = false;
4062 spin_lock_bh(&ifp->lock);
4063 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
4064 ifp->state = INET6_IFADDR_STATE_PREDAD;
4067 spin_unlock_bh(&ifp->lock);
4070 addrconf_mod_dad_work(ifp, 0);
4073 static void addrconf_dad_work(struct work_struct *w)
4075 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
4076 struct inet6_ifaddr,
4078 struct inet6_dev *idev = ifp->idev;
4079 bool bump_id, disable_ipv6 = false;
4080 struct in6_addr mcaddr;
4086 } action = DAD_PROCESS;
4090 spin_lock_bh(&ifp->lock);
4091 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
4093 ifp->state = INET6_IFADDR_STATE_DAD;
4094 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
4096 ifp->state = INET6_IFADDR_STATE_POSTDAD;
4098 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 ||
4099 idev->cnf.accept_dad > 1) &&
4100 !idev->cnf.disable_ipv6 &&
4101 !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
4102 struct in6_addr addr;
4104 addr.s6_addr32[0] = htonl(0xfe800000);
4105 addr.s6_addr32[1] = 0;
4107 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
4108 ipv6_addr_equal(&ifp->addr, &addr)) {
4109 /* DAD failed for link-local based on MAC */
4110 idev->cnf.disable_ipv6 = 1;
4112 pr_info("%s: IPv6 being disabled!\n",
4113 ifp->idev->dev->name);
4114 disable_ipv6 = true;
4118 spin_unlock_bh(&ifp->lock);
4120 if (action == DAD_BEGIN) {
4121 addrconf_dad_begin(ifp);
4123 } else if (action == DAD_ABORT) {
4125 addrconf_dad_stop(ifp, 1);
4127 addrconf_ifdown(idev->dev, false);
4131 if (!ifp->dad_probes && addrconf_dad_end(ifp))
4134 write_lock_bh(&idev->lock);
4135 if (idev->dead || !(idev->if_flags & IF_READY)) {
4136 write_unlock_bh(&idev->lock);
4140 spin_lock(&ifp->lock);
4141 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
4142 spin_unlock(&ifp->lock);
4143 write_unlock_bh(&idev->lock);
4147 if (ifp->dad_probes == 0) {
4148 bool send_na = false;
4151 * DAD was successful
4154 if (ifp->flags & IFA_F_TENTATIVE &&
4155 !(ifp->flags & IFA_F_OPTIMISTIC))
4157 bump_id = ifp->flags & IFA_F_TENTATIVE;
4158 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
4159 spin_unlock(&ifp->lock);
4160 write_unlock_bh(&idev->lock);
4162 addrconf_dad_completed(ifp, bump_id, send_na);
4168 addrconf_mod_dad_work(ifp,
4169 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME),
4171 spin_unlock(&ifp->lock);
4172 write_unlock_bh(&idev->lock);
4174 /* send a neighbour solicitation for our addr */
4175 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
4176 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
4183 /* ifp->idev must be at least read locked */
4184 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
4186 struct inet6_ifaddr *ifpiter;
4187 struct inet6_dev *idev = ifp->idev;
4189 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
4190 if (ifpiter->scope > IFA_LINK)
4192 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
4193 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
4194 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
4201 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
4204 struct net_device *dev = ifp->idev->dev;
4205 struct in6_addr lladdr;
4206 bool send_rs, send_mld;
4208 addrconf_del_dad_work(ifp);
4211 * Configure the address for reception. Now it is valid.
4214 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4216 /* If added prefix is link local and we are prepared to process
4217 router advertisements, start sending router solicitations.
4220 read_lock_bh(&ifp->idev->lock);
4221 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
4222 send_rs = send_mld &&
4223 ipv6_accept_ra(ifp->idev) &&
4224 ifp->idev->cnf.rtr_solicits != 0 &&
4225 (dev->flags & IFF_LOOPBACK) == 0 &&
4226 (dev->type != ARPHRD_TUNNEL);
4227 read_unlock_bh(&ifp->idev->lock);
4229 /* While dad is in progress mld report's source address is in6_addrany.
4230 * Resend with proper ll now.
4233 ipv6_mc_dad_complete(ifp->idev);
4235 /* send unsolicited NA if enabled */
4237 (ifp->idev->cnf.ndisc_notify ||
4238 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) {
4239 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr,
4240 /*router=*/ !!ifp->idev->cnf.forwarding,
4241 /*solicited=*/ false, /*override=*/ true,
4247 * If a host as already performed a random delay
4248 * [...] as part of DAD [...] there is no need
4249 * to delay again before sending the first RS
4251 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
4253 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
4255 write_lock_bh(&ifp->idev->lock);
4256 spin_lock(&ifp->lock);
4257 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4258 ifp->idev->cnf.rtr_solicit_interval);
4259 ifp->idev->rs_probes = 1;
4260 ifp->idev->if_flags |= IF_RS_SENT;
4261 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
4262 spin_unlock(&ifp->lock);
4263 write_unlock_bh(&ifp->idev->lock);
4267 rt_genid_bump_ipv6(dev_net(dev));
4269 /* Make sure that a new temporary address will be created
4270 * before this temporary address becomes deprecated.
4272 if (ifp->flags & IFA_F_TEMPORARY)
4273 addrconf_verify_rtnl();
4276 static void addrconf_dad_run(struct inet6_dev *idev, bool restart)
4278 struct inet6_ifaddr *ifp;
4280 read_lock_bh(&idev->lock);
4281 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4282 spin_lock(&ifp->lock);
4283 if ((ifp->flags & IFA_F_TENTATIVE &&
4284 ifp->state == INET6_IFADDR_STATE_DAD) || restart) {
4286 ifp->state = INET6_IFADDR_STATE_PREDAD;
4287 addrconf_dad_kick(ifp);
4289 spin_unlock(&ifp->lock);
4291 read_unlock_bh(&idev->lock);
4294 #ifdef CONFIG_PROC_FS
4295 struct if6_iter_state {
4296 struct seq_net_private p;
4301 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
4303 struct if6_iter_state *state = seq->private;
4304 struct net *net = seq_file_net(seq);
4305 struct inet6_ifaddr *ifa = NULL;
4308 /* initial bucket if pos is 0 */
4314 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
4315 hlist_for_each_entry_rcu(ifa, &inet6_addr_lst[state->bucket],
4317 if (!net_eq(dev_net(ifa->idev->dev), net))
4319 /* sync with offset */
4320 if (p < state->offset) {
4327 /* prepare for next bucket */
4334 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4335 struct inet6_ifaddr *ifa)
4337 struct if6_iter_state *state = seq->private;
4338 struct net *net = seq_file_net(seq);
4340 hlist_for_each_entry_continue_rcu(ifa, addr_lst) {
4341 if (!net_eq(dev_net(ifa->idev->dev), net))
4348 while (++state->bucket < IN6_ADDR_HSIZE) {
4349 hlist_for_each_entry_rcu(ifa,
4350 &inet6_addr_lst[state->bucket], addr_lst) {
4351 if (!net_eq(dev_net(ifa->idev->dev), net))
4360 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4364 return if6_get_first(seq, *pos);
4367 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4369 struct inet6_ifaddr *ifa;
4371 ifa = if6_get_next(seq, v);
4376 static void if6_seq_stop(struct seq_file *seq, void *v)
4382 static int if6_seq_show(struct seq_file *seq, void *v)
4384 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4385 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
4387 ifp->idev->dev->ifindex,
4391 ifp->idev->dev->name);
4395 static const struct seq_operations if6_seq_ops = {
4396 .start = if6_seq_start,
4397 .next = if6_seq_next,
4398 .show = if6_seq_show,
4399 .stop = if6_seq_stop,
4402 static int __net_init if6_proc_net_init(struct net *net)
4404 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops,
4405 sizeof(struct if6_iter_state)))
4410 static void __net_exit if6_proc_net_exit(struct net *net)
4412 remove_proc_entry("if_inet6", net->proc_net);
4415 static struct pernet_operations if6_proc_net_ops = {
4416 .init = if6_proc_net_init,
4417 .exit = if6_proc_net_exit,
4420 int __init if6_proc_init(void)
4422 return register_pernet_subsys(&if6_proc_net_ops);
4425 void if6_proc_exit(void)
4427 unregister_pernet_subsys(&if6_proc_net_ops);
4429 #endif /* CONFIG_PROC_FS */
4431 #if IS_ENABLED(CONFIG_IPV6_MIP6)
4432 /* Check if address is a home address configured on any interface. */
4433 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
4435 unsigned int hash = inet6_addr_hash(net, addr);
4436 struct inet6_ifaddr *ifp = NULL;
4440 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
4441 if (!net_eq(dev_net(ifp->idev->dev), net))
4443 if (ipv6_addr_equal(&ifp->addr, addr) &&
4444 (ifp->flags & IFA_F_HOMEADDRESS)) {
4454 /* RFC6554 has some algorithm to avoid loops in segment routing by
4455 * checking if the segments contains any of a local interface address.
4459 * To detect loops in the SRH, a router MUST determine if the SRH
4460 * includes multiple addresses assigned to any interface on that router.
4461 * If such addresses appear more than once and are separated by at least
4462 * one address not assigned to that router.
4464 int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs,
4465 unsigned char nsegs)
4467 const struct in6_addr *addr;
4468 int i, ret = 0, found = 0;
4469 struct inet6_ifaddr *ifp;
4470 bool separated = false;
4475 for (i = 0; i < nsegs; i++) {
4477 hash = inet6_addr_hash(net, addr);
4480 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
4481 if (!net_eq(dev_net(ifp->idev->dev), net))
4484 if (ipv6_addr_equal(&ifp->addr, addr)) {
4491 if (found > 1 && separated) {
4508 * Periodic address status verification
4511 static void addrconf_verify_rtnl(void)
4513 unsigned long now, next, next_sec, next_sched;
4514 struct inet6_ifaddr *ifp;
4521 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
4523 cancel_delayed_work(&addr_chk_work);
4525 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
4527 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
4530 /* When setting preferred_lft to a value not zero or
4531 * infinity, while valid_lft is infinity
4532 * IFA_F_PERMANENT has a non-infinity life time.
4534 if ((ifp->flags & IFA_F_PERMANENT) &&
4535 (ifp->prefered_lft == INFINITY_LIFE_TIME))
4538 spin_lock(&ifp->lock);
4539 /* We try to batch several events at once. */
4540 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
4542 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4543 age >= ifp->valid_lft) {
4544 spin_unlock(&ifp->lock);
4548 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4549 spin_unlock(&ifp->lock);
4551 } else if (age >= ifp->prefered_lft) {
4552 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
4555 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4557 ifp->flags |= IFA_F_DEPRECATED;
4560 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4561 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
4562 next = ifp->tstamp + ifp->valid_lft * HZ;
4564 spin_unlock(&ifp->lock);
4569 ipv6_ifa_notify(0, ifp);
4573 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4574 !(ifp->flags&IFA_F_TENTATIVE)) {
4575 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4576 ifp->idev->cnf.dad_transmits *
4577 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME), HZ/100) / HZ;
4579 if (age >= ifp->prefered_lft - regen_advance) {
4580 struct inet6_ifaddr *ifpub = ifp->ifpub;
4581 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4582 next = ifp->tstamp + ifp->prefered_lft * HZ;
4583 if (!ifp->regen_count && ifpub) {
4586 in6_ifa_hold(ifpub);
4587 spin_unlock(&ifp->lock);
4589 spin_lock(&ifpub->lock);
4590 ifpub->regen_count = 0;
4591 spin_unlock(&ifpub->lock);
4592 rcu_read_unlock_bh();
4593 ipv6_create_tempaddr(ifpub, true);
4599 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4600 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4601 spin_unlock(&ifp->lock);
4603 /* ifp->prefered_lft <= ifp->valid_lft */
4604 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4605 next = ifp->tstamp + ifp->prefered_lft * HZ;
4606 spin_unlock(&ifp->lock);
4611 next_sec = round_jiffies_up(next);
4614 /* If rounded timeout is accurate enough, accept it. */
4615 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4616 next_sched = next_sec;
4618 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4619 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4620 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4622 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4623 now, next, next_sec, next_sched);
4624 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
4625 rcu_read_unlock_bh();
4628 static void addrconf_verify_work(struct work_struct *w)
4631 addrconf_verify_rtnl();
4635 static void addrconf_verify(void)
4637 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4640 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4641 struct in6_addr **peer_pfx)
4643 struct in6_addr *pfx = NULL;
4648 pfx = nla_data(addr);
4651 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4653 pfx = nla_data(local);
4659 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4660 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4661 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4662 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
4663 [IFA_FLAGS] = { .len = sizeof(u32) },
4664 [IFA_RT_PRIORITY] = { .len = sizeof(u32) },
4665 [IFA_TARGET_NETNSID] = { .type = NLA_S32 },
4669 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
4670 struct netlink_ext_ack *extack)
4672 struct net *net = sock_net(skb->sk);
4673 struct ifaddrmsg *ifm;
4674 struct nlattr *tb[IFA_MAX+1];
4675 struct in6_addr *pfx, *peer_pfx;
4679 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4680 ifa_ipv6_policy, extack);
4684 ifm = nlmsg_data(nlh);
4685 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4689 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4691 /* We ignore other flags so far. */
4692 ifa_flags &= IFA_F_MANAGETEMPADDR;
4694 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4695 ifm->ifa_prefixlen);
4698 static int modify_prefix_route(struct inet6_ifaddr *ifp,
4699 unsigned long expires, u32 flags,
4702 struct fib6_info *f6i;
4705 f6i = addrconf_get_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
4707 ifp->idev->dev, 0, RTF_DEFAULT, true);
4711 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF;
4712 if (f6i->fib6_metric != prio) {
4713 /* delete old one */
4714 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false);
4717 addrconf_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
4719 ifp->rt_priority, ifp->idev->dev,
4720 expires, flags, GFP_KERNEL);
4723 fib6_clean_expires(f6i);
4725 fib6_set_expires(f6i, expires);
4727 fib6_info_release(f6i);
4733 static int inet6_addr_modify(struct inet6_ifaddr *ifp, struct ifa6_config *cfg)
4737 unsigned long timeout;
4738 bool was_managetempaddr;
4739 bool had_prefixroute;
4740 bool new_peer = false;
4744 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
4747 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR &&
4748 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4751 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED)
4752 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC;
4754 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
4755 if (addrconf_finite_timeout(timeout)) {
4756 expires = jiffies_to_clock_t(timeout * HZ);
4757 cfg->valid_lft = timeout;
4758 flags = RTF_EXPIRES;
4762 cfg->ifa_flags |= IFA_F_PERMANENT;
4765 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
4766 if (addrconf_finite_timeout(timeout)) {
4768 cfg->ifa_flags |= IFA_F_DEPRECATED;
4769 cfg->preferred_lft = timeout;
4772 if (cfg->peer_pfx &&
4773 memcmp(&ifp->peer_addr, cfg->peer_pfx, sizeof(struct in6_addr))) {
4774 if (!ipv6_addr_any(&ifp->peer_addr))
4775 cleanup_prefix_route(ifp, expires, true, true);
4779 spin_lock_bh(&ifp->lock);
4780 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4781 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4782 !(ifp->flags & IFA_F_NOPREFIXROUTE);
4783 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4784 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4785 IFA_F_NOPREFIXROUTE);
4786 ifp->flags |= cfg->ifa_flags;
4787 ifp->tstamp = jiffies;
4788 ifp->valid_lft = cfg->valid_lft;
4789 ifp->prefered_lft = cfg->preferred_lft;
4791 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority)
4792 ifp->rt_priority = cfg->rt_priority;
4795 ifp->peer_addr = *cfg->peer_pfx;
4797 spin_unlock_bh(&ifp->lock);
4798 if (!(ifp->flags&IFA_F_TENTATIVE))
4799 ipv6_ifa_notify(0, ifp);
4801 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
4804 if (had_prefixroute)
4805 rc = modify_prefix_route(ifp, expires, flags, false);
4807 /* prefix route could have been deleted; if so restore it */
4808 if (rc == -ENOENT) {
4809 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
4810 ifp->rt_priority, ifp->idev->dev,
4811 expires, flags, GFP_KERNEL);
4814 if (had_prefixroute && !ipv6_addr_any(&ifp->peer_addr))
4815 rc = modify_prefix_route(ifp, expires, flags, true);
4817 if (rc == -ENOENT && !ipv6_addr_any(&ifp->peer_addr)) {
4818 addrconf_prefix_route(&ifp->peer_addr, ifp->prefix_len,
4819 ifp->rt_priority, ifp->idev->dev,
4820 expires, flags, GFP_KERNEL);
4822 } else if (had_prefixroute) {
4823 enum cleanup_prefix_rt_t action;
4824 unsigned long rt_expires;
4826 write_lock_bh(&ifp->idev->lock);
4827 action = check_cleanup_prefix_route(ifp, &rt_expires);
4828 write_unlock_bh(&ifp->idev->lock);
4830 if (action != CLEANUP_PREFIX_RT_NOP) {
4831 cleanup_prefix_route(ifp, rt_expires,
4832 action == CLEANUP_PREFIX_RT_DEL, false);
4836 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4837 if (was_managetempaddr &&
4838 !(ifp->flags & IFA_F_MANAGETEMPADDR)) {
4840 cfg->preferred_lft = 0;
4842 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft,
4843 cfg->preferred_lft, !was_managetempaddr,
4847 addrconf_verify_rtnl();
4853 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
4854 struct netlink_ext_ack *extack)
4856 struct net *net = sock_net(skb->sk);
4857 struct ifaddrmsg *ifm;
4858 struct nlattr *tb[IFA_MAX+1];
4859 struct in6_addr *peer_pfx;
4860 struct inet6_ifaddr *ifa;
4861 struct net_device *dev;
4862 struct inet6_dev *idev;
4863 struct ifa6_config cfg;
4866 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4867 ifa_ipv6_policy, extack);
4871 memset(&cfg, 0, sizeof(cfg));
4873 ifm = nlmsg_data(nlh);
4874 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4878 cfg.peer_pfx = peer_pfx;
4879 cfg.plen = ifm->ifa_prefixlen;
4880 if (tb[IFA_RT_PRIORITY])
4881 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]);
4883 cfg.valid_lft = INFINITY_LIFE_TIME;
4884 cfg.preferred_lft = INFINITY_LIFE_TIME;
4886 if (tb[IFA_CACHEINFO]) {
4887 struct ifa_cacheinfo *ci;
4889 ci = nla_data(tb[IFA_CACHEINFO]);
4890 cfg.valid_lft = ci->ifa_valid;
4891 cfg.preferred_lft = ci->ifa_prefered;
4894 dev = __dev_get_by_index(net, ifm->ifa_index);
4899 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]);
4901 cfg.ifa_flags = ifm->ifa_flags;
4903 /* We ignore other flags so far. */
4904 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS |
4905 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE |
4906 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC;
4908 idev = ipv6_find_idev(dev);
4910 return PTR_ERR(idev);
4912 if (!ipv6_allow_optimistic_dad(net, idev))
4913 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC;
4915 if (cfg.ifa_flags & IFA_F_NODAD &&
4916 cfg.ifa_flags & IFA_F_OPTIMISTIC) {
4917 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive");
4921 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1);
4924 * It would be best to check for !NLM_F_CREATE here but
4925 * userspace already relies on not having to provide this.
4927 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack);
4930 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4931 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4934 err = inet6_addr_modify(ifa, &cfg);
4941 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4942 u8 scope, int ifindex)
4944 struct ifaddrmsg *ifm;
4946 ifm = nlmsg_data(nlh);
4947 ifm->ifa_family = AF_INET6;
4948 ifm->ifa_prefixlen = prefixlen;
4949 ifm->ifa_flags = flags;
4950 ifm->ifa_scope = scope;
4951 ifm->ifa_index = ifindex;
4954 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4955 unsigned long tstamp, u32 preferred, u32 valid)
4957 struct ifa_cacheinfo ci;
4959 ci.cstamp = cstamp_delta(cstamp);
4960 ci.tstamp = cstamp_delta(tstamp);
4961 ci.ifa_prefered = preferred;
4962 ci.ifa_valid = valid;
4964 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4967 static inline int rt_scope(int ifa_scope)
4969 if (ifa_scope & IFA_HOST)
4970 return RT_SCOPE_HOST;
4971 else if (ifa_scope & IFA_LINK)
4972 return RT_SCOPE_LINK;
4973 else if (ifa_scope & IFA_SITE)
4974 return RT_SCOPE_SITE;
4976 return RT_SCOPE_UNIVERSE;
4979 static inline int inet6_ifaddr_msgsize(void)
4981 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4982 + nla_total_size(16) /* IFA_LOCAL */
4983 + nla_total_size(16) /* IFA_ADDRESS */
4984 + nla_total_size(sizeof(struct ifa_cacheinfo))
4985 + nla_total_size(4) /* IFA_FLAGS */
4986 + nla_total_size(4) /* IFA_RT_PRIORITY */;
4995 struct inet6_fill_args {
5002 enum addr_type_t type;
5005 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
5006 struct inet6_fill_args *args)
5008 struct nlmsghdr *nlh;
5009 u32 preferred, valid;
5011 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5012 sizeof(struct ifaddrmsg), args->flags);
5016 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
5017 ifa->idev->dev->ifindex);
5019 if (args->netnsid >= 0 &&
5020 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
5023 spin_lock_bh(&ifa->lock);
5024 if (!((ifa->flags&IFA_F_PERMANENT) &&
5025 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
5026 preferred = ifa->prefered_lft;
5027 valid = ifa->valid_lft;
5028 if (preferred != INFINITY_LIFE_TIME) {
5029 long tval = (jiffies - ifa->tstamp)/HZ;
5030 if (preferred > tval)
5034 if (valid != INFINITY_LIFE_TIME) {
5042 preferred = INFINITY_LIFE_TIME;
5043 valid = INFINITY_LIFE_TIME;
5045 spin_unlock_bh(&ifa->lock);
5047 if (!ipv6_addr_any(&ifa->peer_addr)) {
5048 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
5049 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
5052 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
5055 if (ifa->rt_priority &&
5056 nla_put_u32(skb, IFA_RT_PRIORITY, ifa->rt_priority))
5059 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
5062 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
5065 nlmsg_end(skb, nlh);
5069 nlmsg_cancel(skb, nlh);
5073 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
5074 struct inet6_fill_args *args)
5076 struct nlmsghdr *nlh;
5077 u8 scope = RT_SCOPE_UNIVERSE;
5078 int ifindex = ifmca->idev->dev->ifindex;
5080 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
5081 scope = RT_SCOPE_SITE;
5083 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5084 sizeof(struct ifaddrmsg), args->flags);
5088 if (args->netnsid >= 0 &&
5089 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) {
5090 nlmsg_cancel(skb, nlh);
5094 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
5095 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
5096 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
5097 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
5098 nlmsg_cancel(skb, nlh);
5102 nlmsg_end(skb, nlh);
5106 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
5107 struct inet6_fill_args *args)
5109 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt);
5110 int ifindex = dev ? dev->ifindex : 1;
5111 struct nlmsghdr *nlh;
5112 u8 scope = RT_SCOPE_UNIVERSE;
5114 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
5115 scope = RT_SCOPE_SITE;
5117 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5118 sizeof(struct ifaddrmsg), args->flags);
5122 if (args->netnsid >= 0 &&
5123 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) {
5124 nlmsg_cancel(skb, nlh);
5128 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
5129 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
5130 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
5131 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
5132 nlmsg_cancel(skb, nlh);
5136 nlmsg_end(skb, nlh);
5140 /* called with rcu_read_lock() */
5141 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
5142 struct netlink_callback *cb, int s_ip_idx,
5143 struct inet6_fill_args *fillargs)
5145 struct ifmcaddr6 *ifmca;
5146 struct ifacaddr6 *ifaca;
5150 read_lock_bh(&idev->lock);
5151 switch (fillargs->type) {
5152 case UNICAST_ADDR: {
5153 struct inet6_ifaddr *ifa;
5154 fillargs->event = RTM_NEWADDR;
5156 /* unicast address incl. temp addr */
5157 list_for_each_entry(ifa, &idev->addr_list, if_list) {
5158 if (ip_idx < s_ip_idx)
5160 err = inet6_fill_ifaddr(skb, ifa, fillargs);
5163 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
5169 case MULTICAST_ADDR:
5170 fillargs->event = RTM_GETMULTICAST;
5172 /* multicast address */
5173 for (ifmca = idev->mc_list; ifmca;
5174 ifmca = ifmca->next, ip_idx++) {
5175 if (ip_idx < s_ip_idx)
5177 err = inet6_fill_ifmcaddr(skb, ifmca, fillargs);
5183 fillargs->event = RTM_GETANYCAST;
5184 /* anycast address */
5185 for (ifaca = idev->ac_list; ifaca;
5186 ifaca = ifaca->aca_next, ip_idx++) {
5187 if (ip_idx < s_ip_idx)
5189 err = inet6_fill_ifacaddr(skb, ifaca, fillargs);
5197 read_unlock_bh(&idev->lock);
5198 cb->args[2] = ip_idx;
5202 static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh,
5203 struct inet6_fill_args *fillargs,
5204 struct net **tgt_net, struct sock *sk,
5205 struct netlink_callback *cb)
5207 struct netlink_ext_ack *extack = cb->extack;
5208 struct nlattr *tb[IFA_MAX+1];
5209 struct ifaddrmsg *ifm;
5212 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5213 NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request");
5217 ifm = nlmsg_data(nlh);
5218 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5219 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request");
5223 fillargs->ifindex = ifm->ifa_index;
5224 if (fillargs->ifindex) {
5225 cb->answer_flags |= NLM_F_DUMP_FILTERED;
5226 fillargs->flags |= NLM_F_DUMP_FILTERED;
5229 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5230 ifa_ipv6_policy, extack);
5234 for (i = 0; i <= IFA_MAX; ++i) {
5238 if (i == IFA_TARGET_NETNSID) {
5241 fillargs->netnsid = nla_get_s32(tb[i]);
5242 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid);
5244 fillargs->netnsid = -1;
5245 NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id");
5246 return PTR_ERR(net);
5250 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request");
5258 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
5259 enum addr_type_t type)
5261 const struct nlmsghdr *nlh = cb->nlh;
5262 struct inet6_fill_args fillargs = {
5263 .portid = NETLINK_CB(cb->skb).portid,
5264 .seq = cb->nlh->nlmsg_seq,
5265 .flags = NLM_F_MULTI,
5269 struct net *net = sock_net(skb->sk);
5270 struct net *tgt_net = net;
5271 int idx, s_idx, s_ip_idx;
5273 struct net_device *dev;
5274 struct inet6_dev *idev;
5275 struct hlist_head *head;
5279 s_idx = idx = cb->args[1];
5280 s_ip_idx = cb->args[2];
5282 if (cb->strict_check) {
5283 err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net,
5289 if (fillargs.ifindex) {
5290 dev = __dev_get_by_index(tgt_net, fillargs.ifindex);
5295 idev = __in6_dev_get(dev);
5297 err = in6_dump_addrs(idev, skb, cb, s_ip_idx,
5307 cb->seq = inet6_base_seq(tgt_net);
5308 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5310 head = &tgt_net->dev_index_head[h];
5311 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5314 if (h > s_h || idx > s_idx)
5316 idev = __in6_dev_get(dev);
5320 if (in6_dump_addrs(idev, skb, cb, s_ip_idx,
5332 if (fillargs.netnsid >= 0)
5335 return skb->len ? : err;
5338 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
5340 enum addr_type_t type = UNICAST_ADDR;
5342 return inet6_dump_addr(skb, cb, type);
5345 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
5347 enum addr_type_t type = MULTICAST_ADDR;
5349 return inet6_dump_addr(skb, cb, type);
5353 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
5355 enum addr_type_t type = ANYCAST_ADDR;
5357 return inet6_dump_addr(skb, cb, type);
5360 static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb,
5361 const struct nlmsghdr *nlh,
5363 struct netlink_ext_ack *extack)
5365 struct ifaddrmsg *ifm;
5368 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5369 NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request");
5373 if (!netlink_strict_get_check(skb))
5374 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
5375 ifa_ipv6_policy, extack);
5377 ifm = nlmsg_data(nlh);
5378 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5379 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request");
5383 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5384 ifa_ipv6_policy, extack);
5388 for (i = 0; i <= IFA_MAX; i++) {
5393 case IFA_TARGET_NETNSID:
5398 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request");
5406 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
5407 struct netlink_ext_ack *extack)
5409 struct net *net = sock_net(in_skb->sk);
5410 struct inet6_fill_args fillargs = {
5411 .portid = NETLINK_CB(in_skb).portid,
5412 .seq = nlh->nlmsg_seq,
5413 .event = RTM_NEWADDR,
5417 struct net *tgt_net = net;
5418 struct ifaddrmsg *ifm;
5419 struct nlattr *tb[IFA_MAX+1];
5420 struct in6_addr *addr = NULL, *peer;
5421 struct net_device *dev = NULL;
5422 struct inet6_ifaddr *ifa;
5423 struct sk_buff *skb;
5426 err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack);
5430 if (tb[IFA_TARGET_NETNSID]) {
5431 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]);
5433 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk,
5435 if (IS_ERR(tgt_net))
5436 return PTR_ERR(tgt_net);
5439 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
5444 ifm = nlmsg_data(nlh);
5446 dev = dev_get_by_index(tgt_net, ifm->ifa_index);
5448 ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1);
5450 err = -EADDRNOTAVAIL;
5454 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
5460 err = inet6_fill_ifaddr(skb, ifa, &fillargs);
5462 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5463 WARN_ON(err == -EMSGSIZE);
5467 err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid);
5473 if (fillargs.netnsid >= 0)
5479 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
5481 struct sk_buff *skb;
5482 struct net *net = dev_net(ifa->idev->dev);
5483 struct inet6_fill_args fillargs = {
5492 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5496 err = inet6_fill_ifaddr(skb, ifa, &fillargs);
5498 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5499 WARN_ON(err == -EMSGSIZE);
5503 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
5507 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
5510 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
5511 __s32 *array, int bytes)
5513 BUG_ON(bytes < (DEVCONF_MAX * 4));
5515 memset(array, 0, bytes);
5516 array[DEVCONF_FORWARDING] = cnf->forwarding;
5517 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
5518 array[DEVCONF_MTU6] = cnf->mtu6;
5519 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
5520 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
5521 array[DEVCONF_AUTOCONF] = cnf->autoconf;
5522 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
5523 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
5524 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
5525 jiffies_to_msecs(cnf->rtr_solicit_interval);
5526 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
5527 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
5528 array[DEVCONF_RTR_SOLICIT_DELAY] =
5529 jiffies_to_msecs(cnf->rtr_solicit_delay);
5530 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
5531 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
5532 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
5533 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
5534 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
5535 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
5536 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
5537 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
5538 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
5539 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
5540 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
5541 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
5542 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
5543 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
5544 #ifdef CONFIG_IPV6_ROUTER_PREF
5545 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
5546 array[DEVCONF_RTR_PROBE_INTERVAL] =
5547 jiffies_to_msecs(cnf->rtr_probe_interval);
5548 #ifdef CONFIG_IPV6_ROUTE_INFO
5549 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen;
5550 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
5553 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
5554 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
5555 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5556 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
5557 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
5559 #ifdef CONFIG_IPV6_MROUTE
5560 array[DEVCONF_MC_FORWARDING] = atomic_read(&cnf->mc_forwarding);
5562 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
5563 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
5564 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5565 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
5566 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
5567 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
5568 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
5569 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
5570 /* we omit DEVCONF_STABLE_SECRET for now */
5571 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
5572 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
5573 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
5574 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
5575 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled;
5576 #ifdef CONFIG_IPV6_SEG6_HMAC
5577 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac;
5579 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad;
5580 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode;
5581 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy;
5582 array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass;
5583 array[DEVCONF_RPL_SEG_ENABLED] = cnf->rpl_seg_enabled;
5584 array[DEVCONF_ACCEPT_RA_MIN_LFT] = cnf->accept_ra_min_lft;
5587 static inline size_t inet6_ifla6_size(void)
5589 return nla_total_size(4) /* IFLA_INET6_FLAGS */
5590 + nla_total_size(sizeof(struct ifla_cacheinfo))
5591 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5592 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
5593 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
5594 + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */
5595 + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */
5599 static inline size_t inet6_if_nlmsg_size(void)
5601 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5602 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5603 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5604 + nla_total_size(4) /* IFLA_MTU */
5605 + nla_total_size(4) /* IFLA_LINK */
5606 + nla_total_size(1) /* IFLA_OPERSTATE */
5607 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
5610 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
5614 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
5617 /* Use put_unaligned() because stats may not be aligned for u64. */
5618 put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5619 for (i = 1; i < ICMP6_MIB_MAX; i++)
5620 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
5622 memset(&stats[ICMP6_MIB_MAX], 0, pad);
5625 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
5626 int bytes, size_t syncpoff)
5629 u64 buff[IPSTATS_MIB_MAX];
5630 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5634 memset(buff, 0, sizeof(buff));
5635 buff[0] = IPSTATS_MIB_MAX;
5637 for_each_possible_cpu(c) {
5638 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5639 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5642 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5643 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
5646 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5650 case IFLA_INET6_STATS:
5651 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5652 offsetof(struct ipstats_mib, syncp));
5654 case IFLA_INET6_ICMP6STATS:
5655 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
5660 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5661 u32 ext_filter_mask)
5664 struct ifla_cacheinfo ci;
5666 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5667 goto nla_put_failure;
5668 ci.max_reasm_len = IPV6_MAXPLEN;
5669 ci.tstamp = cstamp_delta(idev->tstamp);
5670 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
5671 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
5672 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5673 goto nla_put_failure;
5674 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
5676 goto nla_put_failure;
5677 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5679 /* XXX - MC not implemented */
5681 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5684 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
5686 goto nla_put_failure;
5687 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5689 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
5691 goto nla_put_failure;
5692 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5694 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
5696 goto nla_put_failure;
5697 read_lock_bh(&idev->lock);
5698 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5699 read_unlock_bh(&idev->lock);
5701 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode))
5702 goto nla_put_failure;
5710 static size_t inet6_get_link_af_size(const struct net_device *dev,
5711 u32 ext_filter_mask)
5713 if (!__in6_dev_get(dev))
5716 return inet6_ifla6_size();
5719 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5720 u32 ext_filter_mask)
5722 struct inet6_dev *idev = __in6_dev_get(dev);
5727 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
5733 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
5735 struct inet6_ifaddr *ifp;
5736 struct net_device *dev = idev->dev;
5737 bool clear_token, update_rs = false;
5738 struct in6_addr ll_addr;
5744 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5746 if (!ipv6_accept_ra(idev))
5748 if (idev->cnf.rtr_solicits == 0)
5751 write_lock_bh(&idev->lock);
5753 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5754 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5756 write_unlock_bh(&idev->lock);
5758 clear_token = ipv6_addr_any(token);
5762 if (!idev->dead && (idev->if_flags & IF_READY) &&
5763 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5764 IFA_F_OPTIMISTIC)) {
5765 /* If we're not ready, then normal ifup will take care
5766 * of this. Otherwise, we need to request our rs here.
5768 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5773 write_lock_bh(&idev->lock);
5776 idev->if_flags |= IF_RS_SENT;
5777 idev->rs_interval = rfc3315_s14_backoff_init(
5778 idev->cnf.rtr_solicit_interval);
5779 idev->rs_probes = 1;
5780 addrconf_mod_rs_timer(idev, idev->rs_interval);
5783 /* Well, that's kinda nasty ... */
5784 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5785 spin_lock(&ifp->lock);
5786 if (ifp->tokenized) {
5788 ifp->prefered_lft = 0;
5790 spin_unlock(&ifp->lock);
5793 write_unlock_bh(&idev->lock);
5794 inet6_ifinfo_notify(RTM_NEWLINK, idev);
5795 addrconf_verify_rtnl();
5799 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5800 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5801 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5804 static int check_addr_gen_mode(int mode)
5806 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5807 mode != IN6_ADDR_GEN_MODE_NONE &&
5808 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5809 mode != IN6_ADDR_GEN_MODE_RANDOM)
5814 static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5817 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5818 !idev->cnf.stable_secret.initialized &&
5819 !net->ipv6.devconf_dflt->stable_secret.initialized)
5824 static int inet6_validate_link_af(const struct net_device *dev,
5825 const struct nlattr *nla)
5827 struct nlattr *tb[IFLA_INET6_MAX + 1];
5828 struct inet6_dev *idev = NULL;
5832 idev = __in6_dev_get(dev);
5834 return -EAFNOSUPPORT;
5837 err = nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla,
5838 inet6_af_policy, NULL);
5842 if (!tb[IFLA_INET6_TOKEN] && !tb[IFLA_INET6_ADDR_GEN_MODE])
5845 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5846 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5848 if (check_addr_gen_mode(mode) < 0)
5850 if (dev && check_stable_privacy(idev, dev_net(dev), mode) < 0)
5857 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5859 struct inet6_dev *idev = __in6_dev_get(dev);
5860 struct nlattr *tb[IFLA_INET6_MAX + 1];
5864 return -EAFNOSUPPORT;
5866 if (nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0)
5869 if (tb[IFLA_INET6_TOKEN]) {
5870 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
5875 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5876 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5878 idev->cnf.addr_gen_mode = mode;
5884 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
5885 u32 portid, u32 seq, int event, unsigned int flags)
5887 struct net_device *dev = idev->dev;
5888 struct ifinfomsg *hdr;
5889 struct nlmsghdr *nlh;
5892 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
5896 hdr = nlmsg_data(nlh);
5897 hdr->ifi_family = AF_INET6;
5899 hdr->ifi_type = dev->type;
5900 hdr->ifi_index = dev->ifindex;
5901 hdr->ifi_flags = dev_get_flags(dev);
5902 hdr->ifi_change = 0;
5904 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5906 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5907 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
5908 (dev->ifindex != dev_get_iflink(dev) &&
5909 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5910 nla_put_u8(skb, IFLA_OPERSTATE,
5911 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
5912 goto nla_put_failure;
5913 protoinfo = nla_nest_start_noflag(skb, IFLA_PROTINFO);
5915 goto nla_put_failure;
5917 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
5918 goto nla_put_failure;
5920 nla_nest_end(skb, protoinfo);
5921 nlmsg_end(skb, nlh);
5925 nlmsg_cancel(skb, nlh);
5929 static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh,
5930 struct netlink_ext_ack *extack)
5932 struct ifinfomsg *ifm;
5934 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5935 NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request");
5939 if (nlmsg_attrlen(nlh, sizeof(*ifm))) {
5940 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header");
5944 ifm = nlmsg_data(nlh);
5945 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
5946 ifm->ifi_change || ifm->ifi_index) {
5947 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request");
5954 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5956 struct net *net = sock_net(skb->sk);
5959 struct net_device *dev;
5960 struct inet6_dev *idev;
5961 struct hlist_head *head;
5963 /* only requests using strict checking can pass data to
5964 * influence the dump
5966 if (cb->strict_check) {
5967 int err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack);
5974 s_idx = cb->args[1];
5977 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5979 head = &net->dev_index_head[h];
5980 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5983 idev = __in6_dev_get(dev);
5986 if (inet6_fill_ifinfo(skb, idev,
5987 NETLINK_CB(cb->skb).portid,
5989 RTM_NEWLINK, NLM_F_MULTI) < 0)
6003 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
6005 struct sk_buff *skb;
6006 struct net *net = dev_net(idev->dev);
6009 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
6013 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
6015 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
6016 WARN_ON(err == -EMSGSIZE);
6020 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
6024 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
6027 static inline size_t inet6_prefix_nlmsg_size(void)
6029 return NLMSG_ALIGN(sizeof(struct prefixmsg))
6030 + nla_total_size(sizeof(struct in6_addr))
6031 + nla_total_size(sizeof(struct prefix_cacheinfo));
6034 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
6035 struct prefix_info *pinfo, u32 portid, u32 seq,
6036 int event, unsigned int flags)
6038 struct prefixmsg *pmsg;
6039 struct nlmsghdr *nlh;
6040 struct prefix_cacheinfo ci;
6042 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
6046 pmsg = nlmsg_data(nlh);
6047 pmsg->prefix_family = AF_INET6;
6048 pmsg->prefix_pad1 = 0;
6049 pmsg->prefix_pad2 = 0;
6050 pmsg->prefix_ifindex = idev->dev->ifindex;
6051 pmsg->prefix_len = pinfo->prefix_len;
6052 pmsg->prefix_type = pinfo->type;
6053 pmsg->prefix_pad3 = 0;
6054 pmsg->prefix_flags = pinfo->flags;
6056 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
6057 goto nla_put_failure;
6058 ci.preferred_time = ntohl(pinfo->prefered);
6059 ci.valid_time = ntohl(pinfo->valid);
6060 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
6061 goto nla_put_failure;
6062 nlmsg_end(skb, nlh);
6066 nlmsg_cancel(skb, nlh);
6070 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
6071 struct prefix_info *pinfo)
6073 struct sk_buff *skb;
6074 struct net *net = dev_net(idev->dev);
6077 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
6081 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
6083 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
6084 WARN_ON(err == -EMSGSIZE);
6088 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
6092 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
6095 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
6097 struct net *net = dev_net(ifp->idev->dev);
6102 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
6107 * If the address was optimistic we inserted the route at the
6108 * start of our DAD process, so we don't need to do it again.
6109 * If the device was taken down in the middle of the DAD
6110 * cycle there is a race where we could get here without a
6111 * host route, so nothing to insert. That will be fixed when
6112 * the device is brought up.
6114 if (ifp->rt && !rcu_access_pointer(ifp->rt->fib6_node)) {
6115 ip6_ins_rt(net, ifp->rt);
6116 } else if (!ifp->rt && (ifp->idev->dev->flags & IFF_UP)) {
6117 pr_warn("BUG: Address %pI6c on device %s is missing its host route.\n",
6118 &ifp->addr, ifp->idev->dev->name);
6121 if (ifp->idev->cnf.forwarding)
6122 addrconf_join_anycast(ifp);
6123 if (!ipv6_addr_any(&ifp->peer_addr))
6124 addrconf_prefix_route(&ifp->peer_addr, 128,
6125 ifp->rt_priority, ifp->idev->dev,
6129 if (ifp->idev->cnf.forwarding)
6130 addrconf_leave_anycast(ifp);
6131 addrconf_leave_solict(ifp->idev, &ifp->addr);
6132 if (!ipv6_addr_any(&ifp->peer_addr)) {
6133 struct fib6_info *rt;
6135 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
6136 ifp->idev->dev, 0, 0,
6139 ip6_del_rt(net, rt, false);
6142 ip6_del_rt(net, ifp->rt, false);
6145 rt_genid_bump_ipv6(net);
6148 atomic_inc(&net->ipv6.dev_addr_genid);
6151 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
6154 if (likely(ifp->idev->dead == 0))
6155 __ipv6_ifa_notify(event, ifp);
6156 rcu_read_unlock_bh();
6159 #ifdef CONFIG_SYSCTL
6161 static int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
6162 void *buffer, size_t *lenp, loff_t *ppos)
6164 int *valp = ctl->data;
6167 struct ctl_table lctl;
6171 * ctl->data points to idev->cnf.forwarding, we should
6172 * not modify it until we get the rtnl lock.
6177 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6180 ret = addrconf_fixup_forwarding(ctl, valp, val);
6186 static int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
6187 void *buffer, size_t *lenp, loff_t *ppos)
6189 struct inet6_dev *idev = ctl->extra1;
6190 int min_mtu = IPV6_MIN_MTU;
6191 struct ctl_table lctl;
6194 lctl.extra1 = &min_mtu;
6195 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
6197 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
6200 static void dev_disable_change(struct inet6_dev *idev)
6202 struct netdev_notifier_info info;
6204 if (!idev || !idev->dev)
6207 netdev_notifier_info_init(&info, idev->dev);
6208 if (idev->cnf.disable_ipv6)
6209 addrconf_notify(NULL, NETDEV_DOWN, &info);
6211 addrconf_notify(NULL, NETDEV_UP, &info);
6214 static void addrconf_disable_change(struct net *net, __s32 newf)
6216 struct net_device *dev;
6217 struct inet6_dev *idev;
6219 for_each_netdev(net, dev) {
6220 idev = __in6_dev_get(dev);
6222 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
6223 idev->cnf.disable_ipv6 = newf;
6225 dev_disable_change(idev);
6230 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
6235 if (!rtnl_trylock())
6236 return restart_syscall();
6238 net = (struct net *)table->extra2;
6242 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
6247 if (p == &net->ipv6.devconf_all->disable_ipv6) {
6248 net->ipv6.devconf_dflt->disable_ipv6 = newf;
6249 addrconf_disable_change(net, newf);
6250 } else if ((!newf) ^ (!old))
6251 dev_disable_change((struct inet6_dev *)table->extra1);
6257 static int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
6258 void *buffer, size_t *lenp, loff_t *ppos)
6260 int *valp = ctl->data;
6263 struct ctl_table lctl;
6267 * ctl->data points to idev->cnf.disable_ipv6, we should
6268 * not modify it until we get the rtnl lock.
6273 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6276 ret = addrconf_disable_ipv6(ctl, valp, val);
6282 static int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
6283 void *buffer, size_t *lenp, loff_t *ppos)
6285 int *valp = ctl->data;
6290 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
6293 if (write && old != new) {
6294 struct net *net = ctl->extra2;
6296 if (!rtnl_trylock())
6297 return restart_syscall();
6299 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
6300 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6301 NETCONFA_PROXY_NEIGH,
6302 NETCONFA_IFINDEX_DEFAULT,
6303 net->ipv6.devconf_dflt);
6304 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
6305 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6306 NETCONFA_PROXY_NEIGH,
6307 NETCONFA_IFINDEX_ALL,
6308 net->ipv6.devconf_all);
6310 struct inet6_dev *idev = ctl->extra1;
6312 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6313 NETCONFA_PROXY_NEIGH,
6323 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
6324 void *buffer, size_t *lenp,
6329 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
6330 struct net *net = (struct net *)ctl->extra2;
6331 struct ctl_table tmp = {
6333 .maxlen = sizeof(new_val),
6337 if (!rtnl_trylock())
6338 return restart_syscall();
6340 new_val = *((u32 *)ctl->data);
6342 ret = proc_douintvec(&tmp, write, buffer, lenp, ppos);
6347 if (check_addr_gen_mode(new_val) < 0) {
6353 if (check_stable_privacy(idev, net, new_val) < 0) {
6358 if (idev->cnf.addr_gen_mode != new_val) {
6359 idev->cnf.addr_gen_mode = new_val;
6360 addrconf_dev_config(idev->dev);
6362 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) {
6363 struct net_device *dev;
6365 net->ipv6.devconf_dflt->addr_gen_mode = new_val;
6366 for_each_netdev(net, dev) {
6367 idev = __in6_dev_get(dev);
6369 idev->cnf.addr_gen_mode != new_val) {
6370 idev->cnf.addr_gen_mode = new_val;
6371 addrconf_dev_config(idev->dev);
6376 *((u32 *)ctl->data) = new_val;
6385 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
6386 void *buffer, size_t *lenp,
6390 struct in6_addr addr;
6391 char str[IPV6_MAX_STRLEN];
6392 struct ctl_table lctl = *ctl;
6393 struct net *net = ctl->extra2;
6394 struct ipv6_stable_secret *secret = ctl->data;
6396 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
6399 lctl.maxlen = IPV6_MAX_STRLEN;
6402 if (!rtnl_trylock())
6403 return restart_syscall();
6405 if (!write && !secret->initialized) {
6410 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
6411 if (err >= sizeof(str)) {
6416 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
6420 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
6425 secret->initialized = true;
6426 secret->secret = addr;
6428 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
6429 struct net_device *dev;
6431 for_each_netdev(net, dev) {
6432 struct inet6_dev *idev = __in6_dev_get(dev);
6435 idev->cnf.addr_gen_mode =
6436 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
6440 struct inet6_dev *idev = ctl->extra1;
6442 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
6452 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
6453 int write, void *buffer,
6457 int *valp = ctl->data;
6460 struct ctl_table lctl;
6463 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
6464 * we should not modify it until we get the rtnl lock.
6469 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6472 ret = addrconf_fixup_linkdown(ctl, valp, val);
6479 void addrconf_set_nopolicy(struct rt6_info *rt, int action)
6483 rt->dst.flags |= DST_NOPOLICY;
6485 rt->dst.flags &= ~DST_NOPOLICY;
6490 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
6492 struct inet6_ifaddr *ifa;
6494 read_lock_bh(&idev->lock);
6495 list_for_each_entry(ifa, &idev->addr_list, if_list) {
6496 spin_lock(&ifa->lock);
6498 /* host routes only use builtin fib6_nh */
6499 struct fib6_nh *nh = ifa->rt->fib6_nh;
6503 ifa->rt->dst_nopolicy = val ? true : false;
6504 if (nh->rt6i_pcpu) {
6505 for_each_possible_cpu(cpu) {
6506 struct rt6_info **rtp;
6508 rtp = per_cpu_ptr(nh->rt6i_pcpu, cpu);
6509 addrconf_set_nopolicy(*rtp, val);
6514 spin_unlock(&ifa->lock);
6516 read_unlock_bh(&idev->lock);
6520 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val)
6522 struct inet6_dev *idev;
6525 if (!rtnl_trylock())
6526 return restart_syscall();
6530 net = (struct net *)ctl->extra2;
6531 if (valp == &net->ipv6.devconf_dflt->disable_policy) {
6536 if (valp == &net->ipv6.devconf_all->disable_policy) {
6537 struct net_device *dev;
6539 for_each_netdev(net, dev) {
6540 idev = __in6_dev_get(dev);
6542 addrconf_disable_policy_idev(idev, val);
6545 idev = (struct inet6_dev *)ctl->extra1;
6546 addrconf_disable_policy_idev(idev, val);
6553 static int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write,
6554 void *buffer, size_t *lenp, loff_t *ppos)
6556 int *valp = ctl->data;
6559 struct ctl_table lctl;
6564 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6566 if (write && (*valp != val))
6567 ret = addrconf_disable_policy(ctl, valp, val);
6575 static int minus_one = -1;
6576 static const int two_five_five = 255;
6578 static const struct ctl_table addrconf_sysctl[] = {
6580 .procname = "forwarding",
6581 .data = &ipv6_devconf.forwarding,
6582 .maxlen = sizeof(int),
6584 .proc_handler = addrconf_sysctl_forward,
6587 .procname = "hop_limit",
6588 .data = &ipv6_devconf.hop_limit,
6589 .maxlen = sizeof(int),
6591 .proc_handler = proc_dointvec_minmax,
6592 .extra1 = (void *)SYSCTL_ONE,
6593 .extra2 = (void *)&two_five_five,
6597 .data = &ipv6_devconf.mtu6,
6598 .maxlen = sizeof(int),
6600 .proc_handler = addrconf_sysctl_mtu,
6603 .procname = "accept_ra",
6604 .data = &ipv6_devconf.accept_ra,
6605 .maxlen = sizeof(int),
6607 .proc_handler = proc_dointvec,
6610 .procname = "accept_redirects",
6611 .data = &ipv6_devconf.accept_redirects,
6612 .maxlen = sizeof(int),
6614 .proc_handler = proc_dointvec,
6617 .procname = "autoconf",
6618 .data = &ipv6_devconf.autoconf,
6619 .maxlen = sizeof(int),
6621 .proc_handler = proc_dointvec,
6624 .procname = "dad_transmits",
6625 .data = &ipv6_devconf.dad_transmits,
6626 .maxlen = sizeof(int),
6628 .proc_handler = proc_dointvec,
6631 .procname = "router_solicitations",
6632 .data = &ipv6_devconf.rtr_solicits,
6633 .maxlen = sizeof(int),
6635 .proc_handler = proc_dointvec_minmax,
6636 .extra1 = &minus_one,
6639 .procname = "router_solicitation_interval",
6640 .data = &ipv6_devconf.rtr_solicit_interval,
6641 .maxlen = sizeof(int),
6643 .proc_handler = proc_dointvec_jiffies,
6646 .procname = "router_solicitation_max_interval",
6647 .data = &ipv6_devconf.rtr_solicit_max_interval,
6648 .maxlen = sizeof(int),
6650 .proc_handler = proc_dointvec_jiffies,
6653 .procname = "router_solicitation_delay",
6654 .data = &ipv6_devconf.rtr_solicit_delay,
6655 .maxlen = sizeof(int),
6657 .proc_handler = proc_dointvec_jiffies,
6660 .procname = "force_mld_version",
6661 .data = &ipv6_devconf.force_mld_version,
6662 .maxlen = sizeof(int),
6664 .proc_handler = proc_dointvec,
6667 .procname = "mldv1_unsolicited_report_interval",
6669 &ipv6_devconf.mldv1_unsolicited_report_interval,
6670 .maxlen = sizeof(int),
6672 .proc_handler = proc_dointvec_ms_jiffies,
6675 .procname = "mldv2_unsolicited_report_interval",
6677 &ipv6_devconf.mldv2_unsolicited_report_interval,
6678 .maxlen = sizeof(int),
6680 .proc_handler = proc_dointvec_ms_jiffies,
6683 .procname = "use_tempaddr",
6684 .data = &ipv6_devconf.use_tempaddr,
6685 .maxlen = sizeof(int),
6687 .proc_handler = proc_dointvec,
6690 .procname = "temp_valid_lft",
6691 .data = &ipv6_devconf.temp_valid_lft,
6692 .maxlen = sizeof(int),
6694 .proc_handler = proc_dointvec,
6697 .procname = "temp_prefered_lft",
6698 .data = &ipv6_devconf.temp_prefered_lft,
6699 .maxlen = sizeof(int),
6701 .proc_handler = proc_dointvec,
6704 .procname = "regen_max_retry",
6705 .data = &ipv6_devconf.regen_max_retry,
6706 .maxlen = sizeof(int),
6708 .proc_handler = proc_dointvec,
6711 .procname = "max_desync_factor",
6712 .data = &ipv6_devconf.max_desync_factor,
6713 .maxlen = sizeof(int),
6715 .proc_handler = proc_dointvec,
6718 .procname = "max_addresses",
6719 .data = &ipv6_devconf.max_addresses,
6720 .maxlen = sizeof(int),
6722 .proc_handler = proc_dointvec,
6725 .procname = "accept_ra_defrtr",
6726 .data = &ipv6_devconf.accept_ra_defrtr,
6727 .maxlen = sizeof(int),
6729 .proc_handler = proc_dointvec,
6732 .procname = "accept_ra_min_hop_limit",
6733 .data = &ipv6_devconf.accept_ra_min_hop_limit,
6734 .maxlen = sizeof(int),
6736 .proc_handler = proc_dointvec,
6739 .procname = "accept_ra_min_lft",
6740 .data = &ipv6_devconf.accept_ra_min_lft,
6741 .maxlen = sizeof(int),
6743 .proc_handler = proc_dointvec,
6746 .procname = "accept_ra_pinfo",
6747 .data = &ipv6_devconf.accept_ra_pinfo,
6748 .maxlen = sizeof(int),
6750 .proc_handler = proc_dointvec,
6752 #ifdef CONFIG_IPV6_ROUTER_PREF
6754 .procname = "accept_ra_rtr_pref",
6755 .data = &ipv6_devconf.accept_ra_rtr_pref,
6756 .maxlen = sizeof(int),
6758 .proc_handler = proc_dointvec,
6761 .procname = "router_probe_interval",
6762 .data = &ipv6_devconf.rtr_probe_interval,
6763 .maxlen = sizeof(int),
6765 .proc_handler = proc_dointvec_jiffies,
6767 #ifdef CONFIG_IPV6_ROUTE_INFO
6769 .procname = "accept_ra_rt_info_min_plen",
6770 .data = &ipv6_devconf.accept_ra_rt_info_min_plen,
6771 .maxlen = sizeof(int),
6773 .proc_handler = proc_dointvec,
6776 .procname = "accept_ra_rt_info_max_plen",
6777 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
6778 .maxlen = sizeof(int),
6780 .proc_handler = proc_dointvec,
6785 .procname = "proxy_ndp",
6786 .data = &ipv6_devconf.proxy_ndp,
6787 .maxlen = sizeof(int),
6789 .proc_handler = addrconf_sysctl_proxy_ndp,
6792 .procname = "accept_source_route",
6793 .data = &ipv6_devconf.accept_source_route,
6794 .maxlen = sizeof(int),
6796 .proc_handler = proc_dointvec,
6798 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
6800 .procname = "optimistic_dad",
6801 .data = &ipv6_devconf.optimistic_dad,
6802 .maxlen = sizeof(int),
6804 .proc_handler = proc_dointvec,
6807 .procname = "use_optimistic",
6808 .data = &ipv6_devconf.use_optimistic,
6809 .maxlen = sizeof(int),
6811 .proc_handler = proc_dointvec,
6814 #ifdef CONFIG_IPV6_MROUTE
6816 .procname = "mc_forwarding",
6817 .data = &ipv6_devconf.mc_forwarding,
6818 .maxlen = sizeof(int),
6820 .proc_handler = proc_dointvec,
6824 .procname = "disable_ipv6",
6825 .data = &ipv6_devconf.disable_ipv6,
6826 .maxlen = sizeof(int),
6828 .proc_handler = addrconf_sysctl_disable,
6831 .procname = "accept_dad",
6832 .data = &ipv6_devconf.accept_dad,
6833 .maxlen = sizeof(int),
6835 .proc_handler = proc_dointvec,
6838 .procname = "force_tllao",
6839 .data = &ipv6_devconf.force_tllao,
6840 .maxlen = sizeof(int),
6842 .proc_handler = proc_dointvec
6845 .procname = "ndisc_notify",
6846 .data = &ipv6_devconf.ndisc_notify,
6847 .maxlen = sizeof(int),
6849 .proc_handler = proc_dointvec
6852 .procname = "suppress_frag_ndisc",
6853 .data = &ipv6_devconf.suppress_frag_ndisc,
6854 .maxlen = sizeof(int),
6856 .proc_handler = proc_dointvec
6859 .procname = "accept_ra_from_local",
6860 .data = &ipv6_devconf.accept_ra_from_local,
6861 .maxlen = sizeof(int),
6863 .proc_handler = proc_dointvec,
6866 .procname = "accept_ra_mtu",
6867 .data = &ipv6_devconf.accept_ra_mtu,
6868 .maxlen = sizeof(int),
6870 .proc_handler = proc_dointvec,
6873 .procname = "stable_secret",
6874 .data = &ipv6_devconf.stable_secret,
6875 .maxlen = IPV6_MAX_STRLEN,
6877 .proc_handler = addrconf_sysctl_stable_secret,
6880 .procname = "use_oif_addrs_only",
6881 .data = &ipv6_devconf.use_oif_addrs_only,
6882 .maxlen = sizeof(int),
6884 .proc_handler = proc_dointvec,
6887 .procname = "ignore_routes_with_linkdown",
6888 .data = &ipv6_devconf.ignore_routes_with_linkdown,
6889 .maxlen = sizeof(int),
6891 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
6894 .procname = "drop_unicast_in_l2_multicast",
6895 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
6896 .maxlen = sizeof(int),
6898 .proc_handler = proc_dointvec,
6901 .procname = "drop_unsolicited_na",
6902 .data = &ipv6_devconf.drop_unsolicited_na,
6903 .maxlen = sizeof(int),
6905 .proc_handler = proc_dointvec,
6908 .procname = "keep_addr_on_down",
6909 .data = &ipv6_devconf.keep_addr_on_down,
6910 .maxlen = sizeof(int),
6912 .proc_handler = proc_dointvec,
6916 .procname = "seg6_enabled",
6917 .data = &ipv6_devconf.seg6_enabled,
6918 .maxlen = sizeof(int),
6920 .proc_handler = proc_dointvec,
6922 #ifdef CONFIG_IPV6_SEG6_HMAC
6924 .procname = "seg6_require_hmac",
6925 .data = &ipv6_devconf.seg6_require_hmac,
6926 .maxlen = sizeof(int),
6928 .proc_handler = proc_dointvec,
6932 .procname = "enhanced_dad",
6933 .data = &ipv6_devconf.enhanced_dad,
6934 .maxlen = sizeof(int),
6936 .proc_handler = proc_dointvec,
6939 .procname = "addr_gen_mode",
6940 .data = &ipv6_devconf.addr_gen_mode,
6941 .maxlen = sizeof(int),
6943 .proc_handler = addrconf_sysctl_addr_gen_mode,
6946 .procname = "disable_policy",
6947 .data = &ipv6_devconf.disable_policy,
6948 .maxlen = sizeof(int),
6950 .proc_handler = addrconf_sysctl_disable_policy,
6953 .procname = "ndisc_tclass",
6954 .data = &ipv6_devconf.ndisc_tclass,
6955 .maxlen = sizeof(int),
6957 .proc_handler = proc_dointvec_minmax,
6958 .extra1 = (void *)SYSCTL_ZERO,
6959 .extra2 = (void *)&two_five_five,
6962 .procname = "rpl_seg_enabled",
6963 .data = &ipv6_devconf.rpl_seg_enabled,
6964 .maxlen = sizeof(int),
6966 .proc_handler = proc_dointvec,
6973 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
6974 struct inet6_dev *idev, struct ipv6_devconf *p)
6977 struct ctl_table *table;
6978 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
6980 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
6984 for (i = 0; table[i].data; i++) {
6985 table[i].data += (char *)p - (char *)&ipv6_devconf;
6986 /* If one of these is already set, then it is not safe to
6987 * overwrite either of them: this makes proc_dointvec_minmax
6990 if (!table[i].extra1 && !table[i].extra2) {
6991 table[i].extra1 = idev; /* embedded; no ref */
6992 table[i].extra2 = net;
6996 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
6998 p->sysctl_header = register_net_sysctl(net, path, table);
6999 if (!p->sysctl_header)
7002 if (!strcmp(dev_name, "all"))
7003 ifindex = NETCONFA_IFINDEX_ALL;
7004 else if (!strcmp(dev_name, "default"))
7005 ifindex = NETCONFA_IFINDEX_DEFAULT;
7007 ifindex = idev->dev->ifindex;
7008 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
7018 static void __addrconf_sysctl_unregister(struct net *net,
7019 struct ipv6_devconf *p, int ifindex)
7021 struct ctl_table *table;
7023 if (!p->sysctl_header)
7026 table = p->sysctl_header->ctl_table_arg;
7027 unregister_net_sysctl_table(p->sysctl_header);
7028 p->sysctl_header = NULL;
7031 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
7034 static int addrconf_sysctl_register(struct inet6_dev *idev)
7038 if (!sysctl_dev_name_is_allowed(idev->dev->name))
7041 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
7042 &ndisc_ifinfo_sysctl_change);
7045 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
7048 neigh_sysctl_unregister(idev->nd_parms);
7053 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
7055 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf,
7056 idev->dev->ifindex);
7057 neigh_sysctl_unregister(idev->nd_parms);
7063 static int __net_init addrconf_init_net(struct net *net)
7066 struct ipv6_devconf *all, *dflt;
7068 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
7072 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
7074 goto err_alloc_dflt;
7076 if (!net_eq(net, &init_net)) {
7077 switch (net_inherit_devconf()) {
7078 case 1: /* copy from init_net */
7079 memcpy(all, init_net.ipv6.devconf_all,
7080 sizeof(ipv6_devconf));
7081 memcpy(dflt, init_net.ipv6.devconf_dflt,
7082 sizeof(ipv6_devconf_dflt));
7084 case 3: /* copy from the current netns */
7085 memcpy(all, current->nsproxy->net_ns->ipv6.devconf_all,
7086 sizeof(ipv6_devconf));
7088 current->nsproxy->net_ns->ipv6.devconf_dflt,
7089 sizeof(ipv6_devconf_dflt));
7093 /* use compiled values */
7098 /* these will be inherited by all namespaces */
7099 dflt->autoconf = ipv6_defaults.autoconf;
7100 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
7102 dflt->stable_secret.initialized = false;
7103 all->stable_secret.initialized = false;
7105 net->ipv6.devconf_all = all;
7106 net->ipv6.devconf_dflt = dflt;
7108 #ifdef CONFIG_SYSCTL
7109 err = __addrconf_sysctl_register(net, "all", NULL, all);
7113 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
7119 #ifdef CONFIG_SYSCTL
7121 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
7131 static void __net_exit addrconf_exit_net(struct net *net)
7133 #ifdef CONFIG_SYSCTL
7134 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt,
7135 NETCONFA_IFINDEX_DEFAULT);
7136 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all,
7137 NETCONFA_IFINDEX_ALL);
7139 kfree(net->ipv6.devconf_dflt);
7140 kfree(net->ipv6.devconf_all);
7143 static struct pernet_operations addrconf_ops = {
7144 .init = addrconf_init_net,
7145 .exit = addrconf_exit_net,
7148 static struct rtnl_af_ops inet6_ops __read_mostly = {
7150 .fill_link_af = inet6_fill_link_af,
7151 .get_link_af_size = inet6_get_link_af_size,
7152 .validate_link_af = inet6_validate_link_af,
7153 .set_link_af = inet6_set_link_af,
7157 * Init / cleanup code
7160 int __init addrconf_init(void)
7162 struct inet6_dev *idev;
7165 err = ipv6_addr_label_init();
7167 pr_crit("%s: cannot initialize default policy table: %d\n",
7172 err = register_pernet_subsys(&addrconf_ops);
7176 addrconf_wq = create_workqueue("ipv6_addrconf");
7182 /* The addrconf netdev notifier requires that loopback_dev
7183 * has it's ipv6 private information allocated and setup
7184 * before it can bring up and give link-local addresses
7185 * to other devices which are up.
7187 * Unfortunately, loopback_dev is not necessarily the first
7188 * entry in the global dev_base list of net devices. In fact,
7189 * it is likely to be the very last entry on that list.
7190 * So this causes the notifier registry below to try and
7191 * give link-local addresses to all devices besides loopback_dev
7192 * first, then loopback_dev, which cases all the non-loopback_dev
7193 * devices to fail to get a link-local address.
7195 * So, as a temporary fix, allocate the ipv6 structure for
7196 * loopback_dev first by hand.
7197 * Longer term, all of the dependencies ipv6 has upon the loopback
7198 * device and it being up should be removed.
7201 idev = ipv6_add_dev(init_net.loopback_dev);
7204 err = PTR_ERR(idev);
7208 ip6_route_init_special_entries();
7210 for (i = 0; i < IN6_ADDR_HSIZE; i++)
7211 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
7213 register_netdevice_notifier(&ipv6_dev_notf);
7217 rtnl_af_register(&inet6_ops);
7219 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK,
7220 NULL, inet6_dump_ifinfo, 0);
7224 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR,
7225 inet6_rtm_newaddr, NULL, 0);
7228 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR,
7229 inet6_rtm_deladdr, NULL, 0);
7232 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR,
7233 inet6_rtm_getaddr, inet6_dump_ifaddr,
7234 RTNL_FLAG_DOIT_UNLOCKED);
7237 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST,
7238 NULL, inet6_dump_ifmcaddr, 0);
7241 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST,
7242 NULL, inet6_dump_ifacaddr, 0);
7245 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF,
7246 inet6_netconf_get_devconf,
7247 inet6_netconf_dump_devconf,
7248 RTNL_FLAG_DOIT_UNLOCKED);
7251 err = ipv6_addr_label_rtnl_register();
7257 rtnl_unregister_all(PF_INET6);
7258 rtnl_af_unregister(&inet6_ops);
7259 unregister_netdevice_notifier(&ipv6_dev_notf);
7261 destroy_workqueue(addrconf_wq);
7263 unregister_pernet_subsys(&addrconf_ops);
7265 ipv6_addr_label_cleanup();
7270 void addrconf_cleanup(void)
7272 struct net_device *dev;
7275 unregister_netdevice_notifier(&ipv6_dev_notf);
7276 unregister_pernet_subsys(&addrconf_ops);
7277 ipv6_addr_label_cleanup();
7279 rtnl_af_unregister(&inet6_ops);
7283 /* clean dev list */
7284 for_each_netdev(&init_net, dev) {
7285 if (__in6_dev_get(dev) == NULL)
7287 addrconf_ifdown(dev, true);
7289 addrconf_ifdown(init_net.loopback_dev, true);
7294 spin_lock_bh(&addrconf_hash_lock);
7295 for (i = 0; i < IN6_ADDR_HSIZE; i++)
7296 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
7297 spin_unlock_bh(&addrconf_hash_lock);
7298 cancel_delayed_work(&addr_chk_work);
7301 destroy_workqueue(addrconf_wq);