1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * IPv6 Address [auto]configuration
4 * Linux INET6 implementation
7 * Pedro Roque <roque@di.fc.ul.pt>
8 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
14 * Janos Farkas : delete timer on ifdown
15 * <chexum@bankinf.banki.hu>
16 * Andi Kleen : kill double kfree on module
18 * Maciej W. Rozycki : FDDI support
19 * sekiya@USAGI : Don't send too many RS
21 * yoshfuji@USAGI : Fixed interval between DAD
23 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
24 * address validation timer.
25 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
27 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
28 * address on a same interface.
29 * YOSHIFUJI Hideaki @USAGI : ARCnet support
30 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
32 * YOSHIFUJI Hideaki @USAGI : improved source address
33 * selection; consider scope,
37 #define pr_fmt(fmt) "IPv6: " fmt
39 #include <linux/errno.h>
40 #include <linux/types.h>
41 #include <linux/kernel.h>
42 #include <linux/sched/signal.h>
43 #include <linux/socket.h>
44 #include <linux/sockios.h>
45 #include <linux/net.h>
46 #include <linux/inet.h>
47 #include <linux/in6.h>
48 #include <linux/netdevice.h>
49 #include <linux/if_addr.h>
50 #include <linux/if_arp.h>
51 #include <linux/if_arcnet.h>
52 #include <linux/if_infiniband.h>
53 #include <linux/route.h>
54 #include <linux/inetdevice.h>
55 #include <linux/init.h>
56 #include <linux/slab.h>
58 #include <linux/sysctl.h>
60 #include <linux/capability.h>
61 #include <linux/delay.h>
62 #include <linux/notifier.h>
63 #include <linux/string.h>
64 #include <linux/hash.h>
66 #include <net/net_namespace.h>
70 #include <net/6lowpan.h>
71 #include <net/firewire.h>
73 #include <net/protocol.h>
74 #include <net/ndisc.h>
75 #include <net/ip6_route.h>
76 #include <net/addrconf.h>
79 #include <net/netlink.h>
80 #include <net/pkt_sched.h>
81 #include <net/l3mdev.h>
82 #include <linux/if_tunnel.h>
83 #include <linux/rtnetlink.h>
84 #include <linux/netconf.h>
85 #include <linux/random.h>
86 #include <linux/uaccess.h>
87 #include <asm/unaligned.h>
89 #include <linux/proc_fs.h>
90 #include <linux/seq_file.h>
91 #include <linux/export.h>
92 #include <linux/ioam6.h>
94 #define INFINITY_LIFE_TIME 0xFFFFFFFF
96 #define IPV6_MAX_STRLEN \
97 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
99 static inline u32 cstamp_delta(unsigned long cstamp)
101 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
104 static inline s32 rfc3315_s14_backoff_init(s32 irt)
106 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */
107 u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt;
108 do_div(tmp, 1000000);
112 static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt)
114 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */
115 u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt;
116 do_div(tmp, 1000000);
117 if ((s32)tmp > mrt) {
118 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */
119 tmp = (900000 + prandom_u32() % 200001) * (u64)mrt;
120 do_div(tmp, 1000000);
126 static int addrconf_sysctl_register(struct inet6_dev *idev);
127 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
129 static inline int addrconf_sysctl_register(struct inet6_dev *idev)
134 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
139 static void ipv6_gen_rnd_iid(struct in6_addr *addr);
141 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
142 static int ipv6_count_addresses(const struct inet6_dev *idev);
143 static int ipv6_generate_stable_address(struct in6_addr *addr,
145 const struct inet6_dev *idev);
147 #define IN6_ADDR_HSIZE_SHIFT 8
148 #define IN6_ADDR_HSIZE (1 << IN6_ADDR_HSIZE_SHIFT)
150 * Configured unicast address hash table
152 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
153 static DEFINE_SPINLOCK(addrconf_hash_lock);
155 static void addrconf_verify(void);
156 static void addrconf_verify_rtnl(void);
157 static void addrconf_verify_work(struct work_struct *);
159 static struct workqueue_struct *addrconf_wq;
160 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
162 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
163 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
165 static void addrconf_type_change(struct net_device *dev,
166 unsigned long event);
167 static int addrconf_ifdown(struct net_device *dev, bool unregister);
169 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
171 const struct net_device *dev,
172 u32 flags, u32 noflags,
175 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
176 static void addrconf_dad_work(struct work_struct *w);
177 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
179 static void addrconf_dad_run(struct inet6_dev *idev, bool restart);
180 static void addrconf_rs_timer(struct timer_list *t);
181 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
182 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
184 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
185 struct prefix_info *pinfo);
187 static struct ipv6_devconf ipv6_devconf __read_mostly = {
189 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
190 .mtu6 = IPV6_MIN_MTU,
192 .accept_redirects = 1,
194 .force_mld_version = 0,
195 .mldv1_unsolicited_report_interval = 10 * HZ,
196 .mldv2_unsolicited_report_interval = HZ,
198 .rtr_solicits = MAX_RTR_SOLICITATIONS,
199 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
200 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
201 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
203 .temp_valid_lft = TEMP_VALID_LIFETIME,
204 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
205 .regen_max_retry = REGEN_MAX_RETRY,
206 .max_desync_factor = MAX_DESYNC_FACTOR,
207 .max_addresses = IPV6_MAX_ADDRESSES,
208 .accept_ra_defrtr = 1,
209 .ra_defrtr_metric = IP6_RT_PRIO_USER,
210 .accept_ra_from_local = 0,
211 .accept_ra_min_hop_limit= 1,
212 .accept_ra_min_lft = 0,
213 .accept_ra_pinfo = 1,
214 #ifdef CONFIG_IPV6_ROUTER_PREF
215 .accept_ra_rtr_pref = 1,
216 .rtr_probe_interval = 60 * HZ,
217 #ifdef CONFIG_IPV6_ROUTE_INFO
218 .accept_ra_rt_info_min_plen = 0,
219 .accept_ra_rt_info_max_plen = 0,
223 .accept_source_route = 0, /* we do not accept RH0 by default. */
226 .suppress_frag_ndisc = 1,
229 .initialized = false,
231 .use_oif_addrs_only = 0,
232 .ignore_routes_with_linkdown = 0,
233 .keep_addr_on_down = 0,
235 #ifdef CONFIG_IPV6_SEG6_HMAC
236 .seg6_require_hmac = 0,
239 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
241 .rpl_seg_enabled = 0,
243 .ioam6_id = IOAM6_DEFAULT_IF_ID,
244 .ioam6_id_wide = IOAM6_DEFAULT_IF_ID_WIDE,
247 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
249 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
250 .mtu6 = IPV6_MIN_MTU,
252 .accept_redirects = 1,
254 .force_mld_version = 0,
255 .mldv1_unsolicited_report_interval = 10 * HZ,
256 .mldv2_unsolicited_report_interval = HZ,
258 .rtr_solicits = MAX_RTR_SOLICITATIONS,
259 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
260 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
261 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
263 .temp_valid_lft = TEMP_VALID_LIFETIME,
264 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
265 .regen_max_retry = REGEN_MAX_RETRY,
266 .max_desync_factor = MAX_DESYNC_FACTOR,
267 .max_addresses = IPV6_MAX_ADDRESSES,
268 .accept_ra_defrtr = 1,
269 .ra_defrtr_metric = IP6_RT_PRIO_USER,
270 .accept_ra_from_local = 0,
271 .accept_ra_min_hop_limit= 1,
272 .accept_ra_min_lft = 0,
273 .accept_ra_pinfo = 1,
274 #ifdef CONFIG_IPV6_ROUTER_PREF
275 .accept_ra_rtr_pref = 1,
276 .rtr_probe_interval = 60 * HZ,
277 #ifdef CONFIG_IPV6_ROUTE_INFO
278 .accept_ra_rt_info_min_plen = 0,
279 .accept_ra_rt_info_max_plen = 0,
283 .accept_source_route = 0, /* we do not accept RH0 by default. */
286 .suppress_frag_ndisc = 1,
289 .initialized = false,
291 .use_oif_addrs_only = 0,
292 .ignore_routes_with_linkdown = 0,
293 .keep_addr_on_down = 0,
295 #ifdef CONFIG_IPV6_SEG6_HMAC
296 .seg6_require_hmac = 0,
299 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
301 .rpl_seg_enabled = 0,
303 .ioam6_id = IOAM6_DEFAULT_IF_ID,
304 .ioam6_id_wide = IOAM6_DEFAULT_IF_ID_WIDE,
307 /* Check if link is ready: is it up and is a valid qdisc available */
308 static inline bool addrconf_link_ready(const struct net_device *dev)
310 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev);
313 static void addrconf_del_rs_timer(struct inet6_dev *idev)
315 if (del_timer(&idev->rs_timer))
319 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
321 if (cancel_delayed_work(&ifp->dad_work))
325 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
328 if (!mod_timer(&idev->rs_timer, jiffies + when))
332 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
336 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay))
340 static int snmp6_alloc_dev(struct inet6_dev *idev)
344 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
345 if (!idev->stats.ipv6)
348 for_each_possible_cpu(i) {
349 struct ipstats_mib *addrconf_stats;
350 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
351 u64_stats_init(&addrconf_stats->syncp);
355 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
357 if (!idev->stats.icmpv6dev)
359 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
361 if (!idev->stats.icmpv6msgdev)
367 kfree(idev->stats.icmpv6dev);
369 free_percpu(idev->stats.ipv6);
374 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
376 struct inet6_dev *ndev;
381 if (dev->mtu < IPV6_MIN_MTU)
382 return ERR_PTR(-EINVAL);
384 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
388 rwlock_init(&ndev->lock);
390 INIT_LIST_HEAD(&ndev->addr_list);
391 timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0);
392 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
394 if (ndev->cnf.stable_secret.initialized)
395 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
397 ndev->cnf.mtu6 = dev->mtu;
399 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
400 if (!ndev->nd_parms) {
404 if (ndev->cnf.forwarding)
405 dev_disable_lro(dev);
406 /* We refer to the device */
409 if (snmp6_alloc_dev(ndev) < 0) {
410 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n",
412 neigh_parms_release(&nd_tbl, ndev->nd_parms);
418 if (snmp6_register_dev(ndev) < 0) {
419 netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n",
420 __func__, dev->name);
424 /* One reference from device. */
425 refcount_set(&ndev->refcnt, 1);
427 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
428 ndev->cnf.accept_dad = -1;
430 #if IS_ENABLED(CONFIG_IPV6_SIT)
431 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
432 pr_info("%s: Disabled Multicast RS\n", dev->name);
433 ndev->cnf.rtr_solicits = 0;
437 INIT_LIST_HEAD(&ndev->tempaddr_list);
438 ndev->desync_factor = U32_MAX;
439 if ((dev->flags&IFF_LOOPBACK) ||
440 dev->type == ARPHRD_TUNNEL ||
441 dev->type == ARPHRD_TUNNEL6 ||
442 dev->type == ARPHRD_SIT ||
443 dev->type == ARPHRD_NONE) {
444 ndev->cnf.use_tempaddr = -1;
447 ndev->token = in6addr_any;
449 if (netif_running(dev) && addrconf_link_ready(dev))
450 ndev->if_flags |= IF_READY;
452 ipv6_mc_init_dev(ndev);
453 ndev->tstamp = jiffies;
454 err = addrconf_sysctl_register(ndev);
456 ipv6_mc_destroy_dev(ndev);
457 snmp6_unregister_dev(ndev);
460 /* protected by rtnl_lock */
461 rcu_assign_pointer(dev->ip6_ptr, ndev);
463 /* Join interface-local all-node multicast group */
464 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
466 /* Join all-node multicast group */
467 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
469 /* Join all-router multicast group if forwarding is set */
470 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
471 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
476 neigh_parms_release(&nd_tbl, ndev->nd_parms);
478 in6_dev_finish_destroy(ndev);
482 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
484 struct inet6_dev *idev;
488 idev = __in6_dev_get(dev);
490 idev = ipv6_add_dev(dev);
495 if (dev->flags&IFF_UP)
500 static int inet6_netconf_msgsize_devconf(int type)
502 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
503 + nla_total_size(4); /* NETCONFA_IFINDEX */
506 if (type == NETCONFA_ALL)
509 if (all || type == NETCONFA_FORWARDING)
510 size += nla_total_size(4);
511 #ifdef CONFIG_IPV6_MROUTE
512 if (all || type == NETCONFA_MC_FORWARDING)
513 size += nla_total_size(4);
515 if (all || type == NETCONFA_PROXY_NEIGH)
516 size += nla_total_size(4);
518 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
519 size += nla_total_size(4);
524 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
525 struct ipv6_devconf *devconf, u32 portid,
526 u32 seq, int event, unsigned int flags,
529 struct nlmsghdr *nlh;
530 struct netconfmsg *ncm;
533 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
538 if (type == NETCONFA_ALL)
541 ncm = nlmsg_data(nlh);
542 ncm->ncm_family = AF_INET6;
544 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
545 goto nla_put_failure;
550 if ((all || type == NETCONFA_FORWARDING) &&
551 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
552 goto nla_put_failure;
553 #ifdef CONFIG_IPV6_MROUTE
554 if ((all || type == NETCONFA_MC_FORWARDING) &&
555 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
556 atomic_read(&devconf->mc_forwarding)) < 0)
557 goto nla_put_failure;
559 if ((all || type == NETCONFA_PROXY_NEIGH) &&
560 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
561 goto nla_put_failure;
563 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
564 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
565 devconf->ignore_routes_with_linkdown) < 0)
566 goto nla_put_failure;
573 nlmsg_cancel(skb, nlh);
577 void inet6_netconf_notify_devconf(struct net *net, int event, int type,
578 int ifindex, struct ipv6_devconf *devconf)
583 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL);
587 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
590 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
591 WARN_ON(err == -EMSGSIZE);
595 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL);
598 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
601 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
602 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
603 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
604 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
605 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
608 static int inet6_netconf_valid_get_req(struct sk_buff *skb,
609 const struct nlmsghdr *nlh,
611 struct netlink_ext_ack *extack)
615 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) {
616 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf get request");
620 if (!netlink_strict_get_check(skb))
621 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg),
623 devconf_ipv6_policy, extack);
625 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg),
627 devconf_ipv6_policy, extack);
631 for (i = 0; i <= NETCONFA_MAX; i++) {
636 case NETCONFA_IFINDEX:
639 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request");
647 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
648 struct nlmsghdr *nlh,
649 struct netlink_ext_ack *extack)
651 struct net *net = sock_net(in_skb->sk);
652 struct nlattr *tb[NETCONFA_MAX+1];
653 struct inet6_dev *in6_dev = NULL;
654 struct net_device *dev = NULL;
656 struct ipv6_devconf *devconf;
660 err = inet6_netconf_valid_get_req(in_skb, nlh, tb, extack);
664 if (!tb[NETCONFA_IFINDEX])
668 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
670 case NETCONFA_IFINDEX_ALL:
671 devconf = net->ipv6.devconf_all;
673 case NETCONFA_IFINDEX_DEFAULT:
674 devconf = net->ipv6.devconf_dflt;
677 dev = dev_get_by_index(net, ifindex);
680 in6_dev = in6_dev_get(dev);
683 devconf = &in6_dev->cnf;
688 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL);
692 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
693 NETLINK_CB(in_skb).portid,
694 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
697 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
698 WARN_ON(err == -EMSGSIZE);
702 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
705 in6_dev_put(in6_dev);
710 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
711 struct netlink_callback *cb)
713 const struct nlmsghdr *nlh = cb->nlh;
714 struct net *net = sock_net(skb->sk);
717 struct net_device *dev;
718 struct inet6_dev *idev;
719 struct hlist_head *head;
721 if (cb->strict_check) {
722 struct netlink_ext_ack *extack = cb->extack;
723 struct netconfmsg *ncm;
725 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) {
726 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request");
730 if (nlmsg_attrlen(nlh, sizeof(*ncm))) {
731 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request");
737 s_idx = idx = cb->args[1];
739 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
741 head = &net->dev_index_head[h];
743 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
745 hlist_for_each_entry_rcu(dev, head, index_hlist) {
748 idev = __in6_dev_get(dev);
752 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
754 NETLINK_CB(cb->skb).portid,
762 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
768 if (h == NETDEV_HASHENTRIES) {
769 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
770 net->ipv6.devconf_all,
771 NETLINK_CB(cb->skb).portid,
773 RTM_NEWNETCONF, NLM_F_MULTI,
779 if (h == NETDEV_HASHENTRIES + 1) {
780 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
781 net->ipv6.devconf_dflt,
782 NETLINK_CB(cb->skb).portid,
784 RTM_NEWNETCONF, NLM_F_MULTI,
798 static void dev_forward_change(struct inet6_dev *idev)
800 struct net_device *dev;
801 struct inet6_ifaddr *ifa;
802 LIST_HEAD(tmp_addr_list);
807 if (idev->cnf.forwarding)
808 dev_disable_lro(dev);
809 if (dev->flags & IFF_MULTICAST) {
810 if (idev->cnf.forwarding) {
811 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
812 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
813 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
815 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
816 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
817 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
821 read_lock_bh(&idev->lock);
822 list_for_each_entry(ifa, &idev->addr_list, if_list) {
823 if (ifa->flags&IFA_F_TENTATIVE)
825 list_add_tail(&ifa->if_list_aux, &tmp_addr_list);
827 read_unlock_bh(&idev->lock);
829 while (!list_empty(&tmp_addr_list)) {
830 ifa = list_first_entry(&tmp_addr_list,
831 struct inet6_ifaddr, if_list_aux);
832 list_del(&ifa->if_list_aux);
833 if (idev->cnf.forwarding)
834 addrconf_join_anycast(ifa);
836 addrconf_leave_anycast(ifa);
839 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
841 dev->ifindex, &idev->cnf);
845 static void addrconf_forward_change(struct net *net, __s32 newf)
847 struct net_device *dev;
848 struct inet6_dev *idev;
850 for_each_netdev(net, dev) {
851 idev = __in6_dev_get(dev);
853 int changed = (!idev->cnf.forwarding) ^ (!newf);
854 idev->cnf.forwarding = newf;
856 dev_forward_change(idev);
861 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
867 return restart_syscall();
869 net = (struct net *)table->extra2;
873 if (p == &net->ipv6.devconf_dflt->forwarding) {
874 if ((!newf) ^ (!old))
875 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
877 NETCONFA_IFINDEX_DEFAULT,
878 net->ipv6.devconf_dflt);
883 if (p == &net->ipv6.devconf_all->forwarding) {
884 int old_dflt = net->ipv6.devconf_dflt->forwarding;
886 net->ipv6.devconf_dflt->forwarding = newf;
887 if ((!newf) ^ (!old_dflt))
888 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
890 NETCONFA_IFINDEX_DEFAULT,
891 net->ipv6.devconf_dflt);
893 addrconf_forward_change(net, newf);
894 if ((!newf) ^ (!old))
895 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
897 NETCONFA_IFINDEX_ALL,
898 net->ipv6.devconf_all);
899 } else if ((!newf) ^ (!old))
900 dev_forward_change((struct inet6_dev *)table->extra1);
904 rt6_purge_dflt_routers(net);
908 static void addrconf_linkdown_change(struct net *net, __s32 newf)
910 struct net_device *dev;
911 struct inet6_dev *idev;
913 for_each_netdev(net, dev) {
914 idev = __in6_dev_get(dev);
916 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
918 idev->cnf.ignore_routes_with_linkdown = newf;
920 inet6_netconf_notify_devconf(dev_net(dev),
922 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
929 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
935 return restart_syscall();
937 net = (struct net *)table->extra2;
941 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
942 if ((!newf) ^ (!old))
943 inet6_netconf_notify_devconf(net,
945 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
946 NETCONFA_IFINDEX_DEFAULT,
947 net->ipv6.devconf_dflt);
952 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
953 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
954 addrconf_linkdown_change(net, newf);
955 if ((!newf) ^ (!old))
956 inet6_netconf_notify_devconf(net,
958 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
959 NETCONFA_IFINDEX_ALL,
960 net->ipv6.devconf_all);
969 /* Nobody refers to this ifaddr, destroy it */
970 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
972 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
974 #ifdef NET_REFCNT_DEBUG
975 pr_debug("%s\n", __func__);
978 in6_dev_put(ifp->idev);
980 if (cancel_delayed_work(&ifp->dad_work))
981 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
984 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
985 pr_warn("Freeing alive inet6 address %p\n", ifp);
993 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
996 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
999 * Each device address list is sorted in order of scope -
1000 * global before linklocal.
1002 list_for_each(p, &idev->addr_list) {
1003 struct inet6_ifaddr *ifa
1004 = list_entry(p, struct inet6_ifaddr, if_list);
1005 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
1009 list_add_tail_rcu(&ifp->if_list, p);
1012 static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr)
1014 u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net);
1016 return hash_32(val, IN6_ADDR_HSIZE_SHIFT);
1019 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1020 struct net_device *dev, unsigned int hash)
1022 struct inet6_ifaddr *ifp;
1024 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1025 if (!net_eq(dev_net(ifp->idev->dev), net))
1027 if (ipv6_addr_equal(&ifp->addr, addr)) {
1028 if (!dev || ifp->idev->dev == dev)
1035 static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa)
1037 unsigned int hash = inet6_addr_hash(dev_net(dev), &ifa->addr);
1040 spin_lock(&addrconf_hash_lock);
1042 /* Ignore adding duplicate addresses on an interface */
1043 if (ipv6_chk_same_addr(dev_net(dev), &ifa->addr, dev, hash)) {
1044 netdev_dbg(dev, "ipv6_add_addr: already assigned\n");
1047 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
1050 spin_unlock(&addrconf_hash_lock);
1055 /* On success it returns ifp with increased reference count */
1057 static struct inet6_ifaddr *
1058 ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg,
1059 bool can_block, struct netlink_ext_ack *extack)
1061 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC;
1062 int addr_type = ipv6_addr_type(cfg->pfx);
1063 struct net *net = dev_net(idev->dev);
1064 struct inet6_ifaddr *ifa = NULL;
1065 struct fib6_info *f6i = NULL;
1068 if (addr_type == IPV6_ADDR_ANY ||
1069 (addr_type & IPV6_ADDR_MULTICAST &&
1070 !(cfg->ifa_flags & IFA_F_MCAUTOJOIN)) ||
1071 (!(idev->dev->flags & IFF_LOOPBACK) &&
1072 !netif_is_l3_master(idev->dev) &&
1073 addr_type & IPV6_ADDR_LOOPBACK))
1074 return ERR_PTR(-EADDRNOTAVAIL);
1077 err = -ENODEV; /*XXX*/
1081 if (idev->cnf.disable_ipv6) {
1086 /* validator notifier needs to be blocking;
1087 * do not call in atomic context
1090 struct in6_validator_info i6vi = {
1091 .i6vi_addr = *cfg->pfx,
1096 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi);
1097 err = notifier_to_errno(err);
1102 ifa = kzalloc(sizeof(*ifa), gfp_flags | __GFP_ACCOUNT);
1108 f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags);
1115 neigh_parms_data_state_setall(idev->nd_parms);
1117 ifa->addr = *cfg->pfx;
1119 ifa->peer_addr = *cfg->peer_pfx;
1121 spin_lock_init(&ifa->lock);
1122 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
1123 INIT_HLIST_NODE(&ifa->addr_lst);
1124 ifa->scope = cfg->scope;
1125 ifa->prefix_len = cfg->plen;
1126 ifa->rt_priority = cfg->rt_priority;
1127 ifa->flags = cfg->ifa_flags;
1128 /* No need to add the TENTATIVE flag for addresses with NODAD */
1129 if (!(cfg->ifa_flags & IFA_F_NODAD))
1130 ifa->flags |= IFA_F_TENTATIVE;
1131 ifa->valid_lft = cfg->valid_lft;
1132 ifa->prefered_lft = cfg->preferred_lft;
1133 ifa->cstamp = ifa->tstamp = jiffies;
1134 ifa->tokenized = false;
1142 refcount_set(&ifa->refcnt, 1);
1146 err = ipv6_add_addr_hash(idev->dev, ifa);
1148 rcu_read_unlock_bh();
1152 write_lock(&idev->lock);
1154 /* Add to inet6_dev unicast addr list. */
1155 ipv6_link_dev_addr(idev, ifa);
1157 if (ifa->flags&IFA_F_TEMPORARY) {
1158 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1163 write_unlock(&idev->lock);
1165 rcu_read_unlock_bh();
1167 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1169 if (unlikely(err < 0)) {
1170 fib6_info_release(f6i);
1174 in6_dev_put(ifa->idev);
1183 enum cleanup_prefix_rt_t {
1184 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1185 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1186 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1190 * Check, whether the prefix for ifp would still need a prefix route
1191 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1194 * 1) we don't purge prefix if address was not permanent.
1195 * prefix is managed by its own lifetime.
1196 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1197 * 3) if there are no addresses, delete prefix.
1198 * 4) if there are still other permanent address(es),
1199 * corresponding prefix is still permanent.
1200 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1201 * don't purge the prefix, assume user space is managing it.
1202 * 6) otherwise, update prefix lifetime to the
1203 * longest valid lifetime among the corresponding
1204 * addresses on the device.
1205 * Note: subsequent RA will update lifetime.
1207 static enum cleanup_prefix_rt_t
1208 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1210 struct inet6_ifaddr *ifa;
1211 struct inet6_dev *idev = ifp->idev;
1212 unsigned long lifetime;
1213 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1217 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1220 if (ifa->prefix_len != ifp->prefix_len ||
1221 !ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1224 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1225 return CLEANUP_PREFIX_RT_NOP;
1227 action = CLEANUP_PREFIX_RT_EXPIRE;
1229 spin_lock(&ifa->lock);
1231 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1233 * Note: Because this address is
1234 * not permanent, lifetime <
1235 * LONG_MAX / HZ here.
1237 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1238 *expires = ifa->tstamp + lifetime * HZ;
1239 spin_unlock(&ifa->lock);
1246 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires,
1247 bool del_rt, bool del_peer)
1249 struct fib6_info *f6i;
1251 f6i = addrconf_get_prefix_route(del_peer ? &ifp->peer_addr : &ifp->addr,
1253 ifp->idev->dev, 0, RTF_DEFAULT, true);
1256 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false);
1258 if (!(f6i->fib6_flags & RTF_EXPIRES))
1259 fib6_set_expires(f6i, expires);
1260 fib6_info_release(f6i);
1266 /* This function wants to get referenced ifp and releases it before return */
1268 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1271 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1272 unsigned long expires;
1276 spin_lock_bh(&ifp->lock);
1278 ifp->state = INET6_IFADDR_STATE_DEAD;
1279 spin_unlock_bh(&ifp->lock);
1281 if (state == INET6_IFADDR_STATE_DEAD)
1284 spin_lock_bh(&addrconf_hash_lock);
1285 hlist_del_init_rcu(&ifp->addr_lst);
1286 spin_unlock_bh(&addrconf_hash_lock);
1288 write_lock_bh(&ifp->idev->lock);
1290 if (ifp->flags&IFA_F_TEMPORARY) {
1291 list_del(&ifp->tmp_list);
1293 in6_ifa_put(ifp->ifpub);
1299 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1300 action = check_cleanup_prefix_route(ifp, &expires);
1302 list_del_rcu(&ifp->if_list);
1305 write_unlock_bh(&ifp->idev->lock);
1307 addrconf_del_dad_work(ifp);
1309 ipv6_ifa_notify(RTM_DELADDR, ifp);
1311 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1313 if (action != CLEANUP_PREFIX_RT_NOP) {
1314 cleanup_prefix_route(ifp, expires,
1315 action == CLEANUP_PREFIX_RT_DEL, false);
1318 /* clean up prefsrc entries */
1319 rt6_remove_prefsrc(ifp);
1324 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, bool block)
1326 struct inet6_dev *idev = ifp->idev;
1327 unsigned long tmp_tstamp, age;
1328 unsigned long regen_advance;
1329 unsigned long now = jiffies;
1330 s32 cnf_temp_preferred_lft;
1331 struct inet6_ifaddr *ift;
1332 struct ifa6_config cfg;
1333 long max_desync_factor;
1334 struct in6_addr addr;
1337 write_lock_bh(&idev->lock);
1341 if (idev->cnf.use_tempaddr <= 0) {
1342 write_unlock_bh(&idev->lock);
1343 pr_info("%s: use_tempaddr is disabled\n", __func__);
1348 spin_lock_bh(&ifp->lock);
1349 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1350 idev->cnf.use_tempaddr = -1; /*XXX*/
1351 spin_unlock_bh(&ifp->lock);
1352 write_unlock_bh(&idev->lock);
1353 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1360 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1361 ipv6_gen_rnd_iid(&addr);
1363 age = (now - ifp->tstamp) / HZ;
1365 regen_advance = idev->cnf.regen_max_retry *
1366 idev->cnf.dad_transmits *
1367 max(NEIGH_VAR(idev->nd_parms, RETRANS_TIME), HZ/100) / HZ;
1369 /* recalculate max_desync_factor each time and update
1370 * idev->desync_factor if it's larger
1372 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
1373 max_desync_factor = min_t(long,
1374 idev->cnf.max_desync_factor,
1375 cnf_temp_preferred_lft - regen_advance);
1377 if (unlikely(idev->desync_factor > max_desync_factor)) {
1378 if (max_desync_factor > 0) {
1379 get_random_bytes(&idev->desync_factor,
1380 sizeof(idev->desync_factor));
1381 idev->desync_factor %= max_desync_factor;
1383 idev->desync_factor = 0;
1387 memset(&cfg, 0, sizeof(cfg));
1388 cfg.valid_lft = min_t(__u32, ifp->valid_lft,
1389 idev->cnf.temp_valid_lft + age);
1390 cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor;
1391 cfg.preferred_lft = min_t(__u32, ifp->prefered_lft, cfg.preferred_lft);
1393 cfg.plen = ifp->prefix_len;
1394 tmp_tstamp = ifp->tstamp;
1395 spin_unlock_bh(&ifp->lock);
1397 write_unlock_bh(&idev->lock);
1399 /* A temporary address is created only if this calculated Preferred
1400 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1401 * an implementation must not create a temporary address with a zero
1402 * Preferred Lifetime.
1403 * Use age calculation as in addrconf_verify to avoid unnecessary
1404 * temporary addresses being generated.
1406 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1407 if (cfg.preferred_lft <= regen_advance + age) {
1414 cfg.ifa_flags = IFA_F_TEMPORARY;
1415 /* set in addrconf_prefix_rcv() */
1416 if (ifp->flags & IFA_F_OPTIMISTIC)
1417 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
1420 cfg.scope = ipv6_addr_scope(cfg.pfx);
1422 ift = ipv6_add_addr(idev, &cfg, block, NULL);
1426 pr_info("%s: retry temporary address regeneration\n", __func__);
1427 write_lock_bh(&idev->lock);
1431 spin_lock_bh(&ift->lock);
1434 ift->tstamp = tmp_tstamp;
1435 spin_unlock_bh(&ift->lock);
1437 addrconf_dad_start(ift);
1445 * Choose an appropriate source address (RFC3484)
1448 IPV6_SADDR_RULE_INIT = 0,
1449 IPV6_SADDR_RULE_LOCAL,
1450 IPV6_SADDR_RULE_SCOPE,
1451 IPV6_SADDR_RULE_PREFERRED,
1452 #ifdef CONFIG_IPV6_MIP6
1453 IPV6_SADDR_RULE_HOA,
1455 IPV6_SADDR_RULE_OIF,
1456 IPV6_SADDR_RULE_LABEL,
1457 IPV6_SADDR_RULE_PRIVACY,
1458 IPV6_SADDR_RULE_ORCHID,
1459 IPV6_SADDR_RULE_PREFIX,
1460 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1461 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1466 struct ipv6_saddr_score {
1469 struct inet6_ifaddr *ifa;
1470 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1475 struct ipv6_saddr_dst {
1476 const struct in6_addr *addr;
1483 static inline int ipv6_saddr_preferred(int type)
1485 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1490 static bool ipv6_use_optimistic_addr(struct net *net,
1491 struct inet6_dev *idev)
1493 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1496 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1498 if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic)
1507 static bool ipv6_allow_optimistic_dad(struct net *net,
1508 struct inet6_dev *idev)
1510 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1513 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1522 static int ipv6_get_saddr_eval(struct net *net,
1523 struct ipv6_saddr_score *score,
1524 struct ipv6_saddr_dst *dst,
1529 if (i <= score->rule) {
1531 case IPV6_SADDR_RULE_SCOPE:
1532 ret = score->scopedist;
1534 case IPV6_SADDR_RULE_PREFIX:
1535 ret = score->matchlen;
1538 ret = !!test_bit(i, score->scorebits);
1544 case IPV6_SADDR_RULE_INIT:
1545 /* Rule 0: remember if hiscore is not ready yet */
1548 case IPV6_SADDR_RULE_LOCAL:
1549 /* Rule 1: Prefer same address */
1550 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1552 case IPV6_SADDR_RULE_SCOPE:
1553 /* Rule 2: Prefer appropriate scope
1558 * ---+--+-+---> scope
1560 * | d is scope of the destination.
1562 * | \ <- smaller scope is better if
1563 * B-15 | \ if scope is enough for destination.
1564 * | ret = B - scope (-1 <= scope >= d <= 15).
1566 * |/ <- greater is better
1567 * -C / if scope is not enough for destination.
1568 * /| ret = scope - C (-1 <= d < scope <= 15).
1570 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1571 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1572 * Assume B = 0 and we get C > 29.
1574 ret = __ipv6_addr_src_scope(score->addr_type);
1575 if (ret >= dst->scope)
1578 ret -= 128; /* 30 is enough */
1579 score->scopedist = ret;
1581 case IPV6_SADDR_RULE_PREFERRED:
1583 /* Rule 3: Avoid deprecated and optimistic addresses */
1584 u8 avoid = IFA_F_DEPRECATED;
1586 if (!ipv6_use_optimistic_addr(net, score->ifa->idev))
1587 avoid |= IFA_F_OPTIMISTIC;
1588 ret = ipv6_saddr_preferred(score->addr_type) ||
1589 !(score->ifa->flags & avoid);
1592 #ifdef CONFIG_IPV6_MIP6
1593 case IPV6_SADDR_RULE_HOA:
1595 /* Rule 4: Prefer home address */
1596 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1597 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1601 case IPV6_SADDR_RULE_OIF:
1602 /* Rule 5: Prefer outgoing interface */
1603 ret = (!dst->ifindex ||
1604 dst->ifindex == score->ifa->idev->dev->ifindex);
1606 case IPV6_SADDR_RULE_LABEL:
1607 /* Rule 6: Prefer matching label */
1608 ret = ipv6_addr_label(net,
1609 &score->ifa->addr, score->addr_type,
1610 score->ifa->idev->dev->ifindex) == dst->label;
1612 case IPV6_SADDR_RULE_PRIVACY:
1614 /* Rule 7: Prefer public address
1615 * Note: prefer temporary address if use_tempaddr >= 2
1617 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1618 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1619 score->ifa->idev->cnf.use_tempaddr >= 2;
1620 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1623 case IPV6_SADDR_RULE_ORCHID:
1624 /* Rule 8-: Prefer ORCHID vs ORCHID or
1625 * non-ORCHID vs non-ORCHID
1627 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1628 ipv6_addr_orchid(dst->addr));
1630 case IPV6_SADDR_RULE_PREFIX:
1631 /* Rule 8: Use longest matching prefix */
1632 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1633 if (ret > score->ifa->prefix_len)
1634 ret = score->ifa->prefix_len;
1635 score->matchlen = ret;
1637 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1638 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1639 /* Optimistic addresses still have lower precedence than other
1640 * preferred addresses.
1642 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1650 __set_bit(i, score->scorebits);
1656 static int __ipv6_dev_get_saddr(struct net *net,
1657 struct ipv6_saddr_dst *dst,
1658 struct inet6_dev *idev,
1659 struct ipv6_saddr_score *scores,
1662 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1664 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) {
1668 * - Tentative Address (RFC2462 section 5.4)
1669 * - A tentative address is not considered
1670 * "assigned to an interface" in the traditional
1671 * sense, unless it is also flagged as optimistic.
1672 * - Candidate Source Address (section 4)
1673 * - In any case, anycast addresses, multicast
1674 * addresses, and the unspecified address MUST
1675 * NOT be included in a candidate set.
1677 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1678 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1681 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1683 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1684 score->addr_type & IPV6_ADDR_MULTICAST)) {
1685 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1691 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1693 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1694 int minihiscore, miniscore;
1696 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1697 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1699 if (minihiscore > miniscore) {
1700 if (i == IPV6_SADDR_RULE_SCOPE &&
1701 score->scopedist > 0) {
1704 * each remaining entry
1705 * has too small (not enough)
1706 * scope, because ifa entries
1707 * are sorted by their scope
1713 } else if (minihiscore < miniscore) {
1714 swap(hiscore, score);
1715 hiscore_idx = 1 - hiscore_idx;
1717 /* restore our iterator */
1718 score->ifa = hiscore->ifa;
1728 static int ipv6_get_saddr_master(struct net *net,
1729 const struct net_device *dst_dev,
1730 const struct net_device *master,
1731 struct ipv6_saddr_dst *dst,
1732 struct ipv6_saddr_score *scores,
1735 struct inet6_dev *idev;
1737 idev = __in6_dev_get(dst_dev);
1739 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1740 scores, hiscore_idx);
1742 idev = __in6_dev_get(master);
1744 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1745 scores, hiscore_idx);
1750 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1751 const struct in6_addr *daddr, unsigned int prefs,
1752 struct in6_addr *saddr)
1754 struct ipv6_saddr_score scores[2], *hiscore;
1755 struct ipv6_saddr_dst dst;
1756 struct inet6_dev *idev;
1757 struct net_device *dev;
1759 bool use_oif_addr = false;
1760 int hiscore_idx = 0;
1763 dst_type = __ipv6_addr_type(daddr);
1765 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1766 dst.scope = __ipv6_addr_src_scope(dst_type);
1767 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1770 scores[hiscore_idx].rule = -1;
1771 scores[hiscore_idx].ifa = NULL;
1775 /* Candidate Source Address (section 4)
1776 * - multicast and link-local destination address,
1777 * the set of candidate source address MUST only
1778 * include addresses assigned to interfaces
1779 * belonging to the same link as the outgoing
1781 * (- For site-local destination addresses, the
1782 * set of candidate source addresses MUST only
1783 * include addresses assigned to interfaces
1784 * belonging to the same site as the outgoing
1786 * - "It is RECOMMENDED that the candidate source addresses
1787 * be the set of unicast addresses assigned to the
1788 * interface that will be used to send to the destination
1789 * (the 'outgoing' interface)." (RFC 6724)
1792 idev = __in6_dev_get(dst_dev);
1793 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1794 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1795 (idev && idev->cnf.use_oif_addrs_only)) {
1796 use_oif_addr = true;
1802 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1804 const struct net_device *master;
1807 /* if dst_dev exists and is enslaved to an L3 device, then
1808 * prefer addresses from dst_dev and then the master over
1809 * any other enslaved devices in the L3 domain.
1811 master = l3mdev_master_dev_rcu(dst_dev);
1813 master_idx = master->ifindex;
1815 hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1817 scores, hiscore_idx);
1819 if (scores[hiscore_idx].ifa)
1823 for_each_netdev_rcu(net, dev) {
1824 /* only consider addresses on devices in the
1827 if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1829 idev = __in6_dev_get(dev);
1832 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1837 hiscore = &scores[hiscore_idx];
1839 ret = -EADDRNOTAVAIL;
1841 *saddr = hiscore->ifa->addr;
1846 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1848 static int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1851 struct inet6_ifaddr *ifp;
1852 int err = -EADDRNOTAVAIL;
1854 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1855 if (ifp->scope > IFA_LINK)
1857 if (ifp->scope == IFA_LINK &&
1858 !(ifp->flags & banned_flags)) {
1867 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1870 struct inet6_dev *idev;
1871 int err = -EADDRNOTAVAIL;
1874 idev = __in6_dev_get(dev);
1876 read_lock_bh(&idev->lock);
1877 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1878 read_unlock_bh(&idev->lock);
1884 static int ipv6_count_addresses(const struct inet6_dev *idev)
1886 const struct inet6_ifaddr *ifp;
1890 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list)
1896 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1897 const struct net_device *dev, int strict)
1899 return ipv6_chk_addr_and_flags(net, addr, dev, !dev,
1900 strict, IFA_F_TENTATIVE);
1902 EXPORT_SYMBOL(ipv6_chk_addr);
1904 /* device argument is used to find the L3 domain of interest. If
1905 * skip_dev_check is set, then the ifp device is not checked against
1906 * the passed in dev argument. So the 2 cases for addresses checks are:
1907 * 1. does the address exist in the L3 domain that dev is part of
1908 * (skip_dev_check = true), or
1910 * 2. does the address exist on the specific device
1911 * (skip_dev_check = false)
1913 static struct net_device *
1914 __ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1915 const struct net_device *dev, bool skip_dev_check,
1916 int strict, u32 banned_flags)
1918 unsigned int hash = inet6_addr_hash(net, addr);
1919 struct net_device *l3mdev, *ndev;
1920 struct inet6_ifaddr *ifp;
1925 l3mdev = l3mdev_master_dev_rcu(dev);
1929 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1930 ndev = ifp->idev->dev;
1931 if (!net_eq(dev_net(ndev), net))
1934 if (l3mdev_master_dev_rcu(ndev) != l3mdev)
1937 /* Decouple optimistic from tentative for evaluation here.
1938 * Ban optimistic addresses explicitly, when required.
1940 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1941 ? (ifp->flags&~IFA_F_TENTATIVE)
1943 if (ipv6_addr_equal(&ifp->addr, addr) &&
1944 !(ifp_flags&banned_flags) &&
1945 (!dev || ndev == dev ||
1946 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1956 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1957 const struct net_device *dev, bool skip_dev_check,
1958 int strict, u32 banned_flags)
1960 return __ipv6_chk_addr_and_flags(net, addr, dev, skip_dev_check,
1961 strict, banned_flags) ? 1 : 0;
1963 EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1966 /* Compares an address/prefix_len with addresses on device @dev.
1967 * If one is found it returns true.
1969 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1970 const unsigned int prefix_len, struct net_device *dev)
1972 const struct inet6_ifaddr *ifa;
1973 const struct inet6_dev *idev;
1977 idev = __in6_dev_get(dev);
1979 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
1980 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1989 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1991 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1993 const struct inet6_ifaddr *ifa;
1994 const struct inet6_dev *idev;
1999 idev = __in6_dev_get(dev);
2001 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
2002 onlink = ipv6_prefix_equal(addr, &ifa->addr,
2011 EXPORT_SYMBOL(ipv6_chk_prefix);
2014 * ipv6_dev_find - find the first device with a given source address.
2015 * @net: the net namespace
2016 * @addr: the source address
2017 * @dev: used to find the L3 domain of interest
2019 * The caller should be protected by RCU, or RTNL.
2021 struct net_device *ipv6_dev_find(struct net *net, const struct in6_addr *addr,
2022 struct net_device *dev)
2024 return __ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1,
2027 EXPORT_SYMBOL(ipv6_dev_find);
2029 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
2030 struct net_device *dev, int strict)
2032 unsigned int hash = inet6_addr_hash(net, addr);
2033 struct inet6_ifaddr *ifp, *result = NULL;
2036 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
2037 if (!net_eq(dev_net(ifp->idev->dev), net))
2039 if (ipv6_addr_equal(&ifp->addr, addr)) {
2040 if (!dev || ifp->idev->dev == dev ||
2041 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
2053 /* Gets referenced address, destroys ifaddr */
2055 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
2058 ifp->flags |= IFA_F_DADFAILED;
2060 if (ifp->flags&IFA_F_TEMPORARY) {
2061 struct inet6_ifaddr *ifpub;
2062 spin_lock_bh(&ifp->lock);
2065 in6_ifa_hold(ifpub);
2066 spin_unlock_bh(&ifp->lock);
2067 ipv6_create_tempaddr(ifpub, true);
2070 spin_unlock_bh(&ifp->lock);
2073 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) {
2074 spin_lock_bh(&ifp->lock);
2075 addrconf_del_dad_work(ifp);
2076 ifp->flags |= IFA_F_TENTATIVE;
2078 ifp->flags &= ~IFA_F_OPTIMISTIC;
2079 spin_unlock_bh(&ifp->lock);
2081 ipv6_ifa_notify(0, ifp);
2088 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
2092 spin_lock_bh(&ifp->lock);
2093 if (ifp->state == INET6_IFADDR_STATE_DAD) {
2094 ifp->state = INET6_IFADDR_STATE_POSTDAD;
2097 spin_unlock_bh(&ifp->lock);
2102 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp)
2104 struct inet6_dev *idev = ifp->idev;
2105 struct net *net = dev_net(ifp->idev->dev);
2107 if (addrconf_dad_end(ifp)) {
2112 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n",
2113 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source);
2115 spin_lock_bh(&ifp->lock);
2117 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
2118 struct in6_addr new_addr;
2119 struct inet6_ifaddr *ifp2;
2120 int retries = ifp->stable_privacy_retry + 1;
2121 struct ifa6_config cfg = {
2123 .plen = ifp->prefix_len,
2124 .ifa_flags = ifp->flags,
2125 .valid_lft = ifp->valid_lft,
2126 .preferred_lft = ifp->prefered_lft,
2127 .scope = ifp->scope,
2130 if (retries > net->ipv6.sysctl.idgen_retries) {
2131 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
2132 ifp->idev->dev->name);
2136 new_addr = ifp->addr;
2137 if (ipv6_generate_stable_address(&new_addr, retries,
2141 spin_unlock_bh(&ifp->lock);
2143 if (idev->cnf.max_addresses &&
2144 ipv6_count_addresses(idev) >=
2145 idev->cnf.max_addresses)
2148 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
2149 ifp->idev->dev->name);
2151 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL);
2155 spin_lock_bh(&ifp2->lock);
2156 ifp2->stable_privacy_retry = retries;
2157 ifp2->state = INET6_IFADDR_STATE_PREDAD;
2158 spin_unlock_bh(&ifp2->lock);
2160 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
2163 spin_lock_bh(&ifp->lock);
2167 /* transition from _POSTDAD to _ERRDAD */
2168 ifp->state = INET6_IFADDR_STATE_ERRDAD;
2169 spin_unlock_bh(&ifp->lock);
2171 addrconf_mod_dad_work(ifp, 0);
2175 /* Join to solicited addr multicast group.
2176 * caller must hold RTNL */
2177 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
2179 struct in6_addr maddr;
2181 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2184 addrconf_addr_solict_mult(addr, &maddr);
2185 ipv6_dev_mc_inc(dev, &maddr);
2188 /* caller must hold RTNL */
2189 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
2191 struct in6_addr maddr;
2193 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2196 addrconf_addr_solict_mult(addr, &maddr);
2197 __ipv6_dev_mc_dec(idev, &maddr);
2200 /* caller must hold RTNL */
2201 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
2203 struct in6_addr addr;
2205 if (ifp->prefix_len >= 127) /* RFC 6164 */
2207 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2208 if (ipv6_addr_any(&addr))
2210 __ipv6_dev_ac_inc(ifp->idev, &addr);
2213 /* caller must hold RTNL */
2214 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
2216 struct in6_addr addr;
2218 if (ifp->prefix_len >= 127) /* RFC 6164 */
2220 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2221 if (ipv6_addr_any(&addr))
2223 __ipv6_dev_ac_dec(ifp->idev, &addr);
2226 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev)
2228 switch (dev->addr_len) {
2230 memcpy(eui, dev->dev_addr, 3);
2233 memcpy(eui + 5, dev->dev_addr + 3, 3);
2235 case EUI64_ADDR_LEN:
2236 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2246 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2248 union fwnet_hwaddr *ha;
2250 if (dev->addr_len != FWNET_ALEN)
2253 ha = (union fwnet_hwaddr *)dev->dev_addr;
2255 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2260 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2262 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2263 if (dev->addr_len != ARCNET_ALEN)
2266 eui[7] = *(u8 *)dev->dev_addr;
2270 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2272 if (dev->addr_len != INFINIBAND_ALEN)
2274 memcpy(eui, dev->dev_addr + 12, 8);
2279 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
2283 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2284 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2285 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2286 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2287 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2288 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2292 memcpy(eui + 4, &addr, 4);
2296 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2298 if (dev->priv_flags & IFF_ISATAP)
2299 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2303 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2305 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2308 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2310 memcpy(eui, dev->perm_addr, 3);
2311 memcpy(eui + 5, dev->perm_addr + 3, 3);
2318 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2320 switch (dev->type) {
2323 return addrconf_ifid_eui48(eui, dev);
2325 return addrconf_ifid_arcnet(eui, dev);
2326 case ARPHRD_INFINIBAND:
2327 return addrconf_ifid_infiniband(eui, dev);
2329 return addrconf_ifid_sit(eui, dev);
2332 return addrconf_ifid_gre(eui, dev);
2333 case ARPHRD_6LOWPAN:
2334 return addrconf_ifid_6lowpan(eui, dev);
2335 case ARPHRD_IEEE1394:
2336 return addrconf_ifid_ieee1394(eui, dev);
2337 case ARPHRD_TUNNEL6:
2340 return addrconf_ifid_ip6tnl(eui, dev);
2345 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2348 struct inet6_ifaddr *ifp;
2350 read_lock_bh(&idev->lock);
2351 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2352 if (ifp->scope > IFA_LINK)
2354 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2355 memcpy(eui, ifp->addr.s6_addr+8, 8);
2360 read_unlock_bh(&idev->lock);
2364 /* Generation of a randomized Interface Identifier
2365 * draft-ietf-6man-rfc4941bis, Section 3.3.1
2368 static void ipv6_gen_rnd_iid(struct in6_addr *addr)
2371 get_random_bytes(&addr->s6_addr[8], 8);
2373 /* <draft-ietf-6man-rfc4941bis-08.txt>, Section 3.3.1:
2374 * check if generated address is not inappropriate:
2376 * - Reserved IPv6 Interface Identifiers
2377 * - XXX: already assigned to an address on the device
2380 /* Subnet-router anycast: 0000:0000:0000:0000 */
2381 if (!(addr->s6_addr32[2] | addr->s6_addr32[3]))
2384 /* IANA Ethernet block: 0200:5EFF:FE00:0000-0200:5EFF:FE00:5212
2385 * Proxy Mobile IPv6: 0200:5EFF:FE00:5213
2386 * IANA Ethernet block: 0200:5EFF:FE00:5214-0200:5EFF:FEFF:FFFF
2388 if (ntohl(addr->s6_addr32[2]) == 0x02005eff &&
2389 (ntohl(addr->s6_addr32[3]) & 0Xff000000) == 0xfe000000)
2392 /* Reserved subnet anycast addresses */
2393 if (ntohl(addr->s6_addr32[2]) == 0xfdffffff &&
2394 ntohl(addr->s6_addr32[3]) >= 0Xffffff80)
2403 addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric,
2404 struct net_device *dev, unsigned long expires,
2405 u32 flags, gfp_t gfp_flags)
2407 struct fib6_config cfg = {
2408 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
2409 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF,
2410 .fc_ifindex = dev->ifindex,
2411 .fc_expires = expires,
2413 .fc_flags = RTF_UP | flags,
2414 .fc_nlinfo.nl_net = dev_net(dev),
2415 .fc_protocol = RTPROT_KERNEL,
2416 .fc_type = RTN_UNICAST,
2421 /* Prevent useless cloning on PtP SIT.
2422 This thing is done here expecting that the whole
2423 class of non-broadcast devices need not cloning.
2425 #if IS_ENABLED(CONFIG_IPV6_SIT)
2426 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2427 cfg.fc_flags |= RTF_NONEXTHOP;
2430 ip6_route_add(&cfg, gfp_flags, NULL);
2434 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2436 const struct net_device *dev,
2437 u32 flags, u32 noflags,
2440 struct fib6_node *fn;
2441 struct fib6_info *rt = NULL;
2442 struct fib6_table *table;
2443 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
2445 table = fib6_get_table(dev_net(dev), tb_id);
2450 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true);
2454 for_each_fib6_node_rt_rcu(fn) {
2455 /* prefix routes only use builtin fib6_nh */
2459 if (rt->fib6_nh->fib_nh_dev->ifindex != dev->ifindex)
2461 if (no_gw && rt->fib6_nh->fib_nh_gw_family)
2463 if ((rt->fib6_flags & flags) != flags)
2465 if ((rt->fib6_flags & noflags) != 0)
2467 if (!fib6_info_hold_safe(rt))
2477 /* Create "default" multicast route to the interface */
2479 static void addrconf_add_mroute(struct net_device *dev)
2481 struct fib6_config cfg = {
2482 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2483 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2484 .fc_ifindex = dev->ifindex,
2487 .fc_type = RTN_MULTICAST,
2488 .fc_nlinfo.nl_net = dev_net(dev),
2489 .fc_protocol = RTPROT_KERNEL,
2492 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2494 ip6_route_add(&cfg, GFP_KERNEL, NULL);
2497 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2499 struct inet6_dev *idev;
2503 idev = ipv6_find_idev(dev);
2507 if (idev->cnf.disable_ipv6)
2508 return ERR_PTR(-EACCES);
2510 /* Add default multicast route */
2511 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
2512 addrconf_add_mroute(dev);
2517 static void manage_tempaddrs(struct inet6_dev *idev,
2518 struct inet6_ifaddr *ifp,
2519 __u32 valid_lft, __u32 prefered_lft,
2520 bool create, unsigned long now)
2523 struct inet6_ifaddr *ift;
2525 read_lock_bh(&idev->lock);
2526 /* update all temporary addresses in the list */
2527 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2528 int age, max_valid, max_prefered;
2530 if (ifp != ift->ifpub)
2533 /* RFC 4941 section 3.3:
2534 * If a received option will extend the lifetime of a public
2535 * address, the lifetimes of temporary addresses should
2536 * be extended, subject to the overall constraint that no
2537 * temporary addresses should ever remain "valid" or "preferred"
2538 * for a time longer than (TEMP_VALID_LIFETIME) or
2539 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2541 age = (now - ift->cstamp) / HZ;
2542 max_valid = idev->cnf.temp_valid_lft - age;
2546 max_prefered = idev->cnf.temp_prefered_lft -
2547 idev->desync_factor - age;
2548 if (max_prefered < 0)
2551 if (valid_lft > max_valid)
2552 valid_lft = max_valid;
2554 if (prefered_lft > max_prefered)
2555 prefered_lft = max_prefered;
2557 spin_lock(&ift->lock);
2559 ift->valid_lft = valid_lft;
2560 ift->prefered_lft = prefered_lft;
2562 if (prefered_lft > 0)
2563 ift->flags &= ~IFA_F_DEPRECATED;
2565 spin_unlock(&ift->lock);
2566 if (!(flags&IFA_F_TENTATIVE))
2567 ipv6_ifa_notify(0, ift);
2570 /* Also create a temporary address if it's enabled but no temporary
2571 * address currently exists.
2572 * However, we get called with valid_lft == 0, prefered_lft == 0, create == false
2573 * as part of cleanup (ie. deleting the mngtmpaddr).
2574 * We don't want that to result in creating a new temporary ip address.
2576 if (list_empty(&idev->tempaddr_list) && (valid_lft || prefered_lft))
2579 if (create && idev->cnf.use_tempaddr > 0) {
2580 /* When a new public address is created as described
2581 * in [ADDRCONF], also create a new temporary address.
2583 read_unlock_bh(&idev->lock);
2584 ipv6_create_tempaddr(ifp, false);
2586 read_unlock_bh(&idev->lock);
2590 static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2592 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2593 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2596 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2597 const struct prefix_info *pinfo,
2598 struct inet6_dev *in6_dev,
2599 const struct in6_addr *addr, int addr_type,
2600 u32 addr_flags, bool sllao, bool tokenized,
2601 __u32 valid_lft, u32 prefered_lft)
2603 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2604 int create = 0, update_lft = 0;
2606 if (!ifp && valid_lft) {
2607 int max_addresses = in6_dev->cnf.max_addresses;
2608 struct ifa6_config cfg = {
2610 .plen = pinfo->prefix_len,
2611 .ifa_flags = addr_flags,
2612 .valid_lft = valid_lft,
2613 .preferred_lft = prefered_lft,
2614 .scope = addr_type & IPV6_ADDR_SCOPE_MASK,
2617 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2618 if ((net->ipv6.devconf_all->optimistic_dad ||
2619 in6_dev->cnf.optimistic_dad) &&
2620 !net->ipv6.devconf_all->forwarding && sllao)
2621 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
2624 /* Do not allow to create too much of autoconfigured
2625 * addresses; this would be too easy way to crash kernel.
2627 if (!max_addresses ||
2628 ipv6_count_addresses(in6_dev) < max_addresses)
2629 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL);
2631 if (IS_ERR_OR_NULL(ifp))
2635 spin_lock_bh(&ifp->lock);
2636 ifp->flags |= IFA_F_MANAGETEMPADDR;
2637 ifp->cstamp = jiffies;
2638 ifp->tokenized = tokenized;
2639 spin_unlock_bh(&ifp->lock);
2640 addrconf_dad_start(ifp);
2648 /* update lifetime (RFC2462 5.5.3 e) */
2649 spin_lock_bh(&ifp->lock);
2651 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2652 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2655 if (!create && stored_lft) {
2656 const u32 minimum_lft = min_t(u32,
2657 stored_lft, MIN_VALID_LIFETIME);
2658 valid_lft = max(valid_lft, minimum_lft);
2660 /* RFC4862 Section 5.5.3e:
2661 * "Note that the preferred lifetime of the
2662 * corresponding address is always reset to
2663 * the Preferred Lifetime in the received
2664 * Prefix Information option, regardless of
2665 * whether the valid lifetime is also reset or
2668 * So we should always update prefered_lft here.
2674 ifp->valid_lft = valid_lft;
2675 ifp->prefered_lft = prefered_lft;
2678 ifp->flags &= ~IFA_F_DEPRECATED;
2679 spin_unlock_bh(&ifp->lock);
2681 if (!(flags&IFA_F_TENTATIVE))
2682 ipv6_ifa_notify(0, ifp);
2684 spin_unlock_bh(&ifp->lock);
2686 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2695 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
2697 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2699 struct prefix_info *pinfo;
2704 struct inet6_dev *in6_dev;
2705 struct net *net = dev_net(dev);
2707 pinfo = (struct prefix_info *) opt;
2709 if (len < sizeof(struct prefix_info)) {
2710 netdev_dbg(dev, "addrconf: prefix option too short\n");
2715 * Validation checks ([ADDRCONF], page 19)
2718 addr_type = ipv6_addr_type(&pinfo->prefix);
2720 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2723 valid_lft = ntohl(pinfo->valid);
2724 prefered_lft = ntohl(pinfo->prefered);
2726 if (prefered_lft > valid_lft) {
2727 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2731 in6_dev = in6_dev_get(dev);
2734 net_dbg_ratelimited("addrconf: device %s not configured\n",
2739 if (valid_lft != 0 && valid_lft < in6_dev->cnf.accept_ra_min_lft)
2743 * Two things going on here:
2744 * 1) Add routes for on-link prefixes
2745 * 2) Configure prefixes with the auto flag set
2748 if (pinfo->onlink) {
2749 struct fib6_info *rt;
2750 unsigned long rt_expires;
2752 /* Avoid arithmetic overflow. Really, we could
2753 * save rt_expires in seconds, likely valid_lft,
2754 * but it would require division in fib gc, that it
2758 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2760 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2762 if (addrconf_finite_timeout(rt_expires))
2765 rt = addrconf_get_prefix_route(&pinfo->prefix,
2768 RTF_ADDRCONF | RTF_PREFIX_RT,
2772 /* Autoconf prefix route */
2773 if (valid_lft == 0) {
2774 ip6_del_rt(net, rt, false);
2776 } else if (addrconf_finite_timeout(rt_expires)) {
2778 fib6_set_expires(rt, jiffies + rt_expires);
2780 fib6_clean_expires(rt);
2782 } else if (valid_lft) {
2783 clock_t expires = 0;
2784 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2785 if (addrconf_finite_timeout(rt_expires)) {
2787 flags |= RTF_EXPIRES;
2788 expires = jiffies_to_clock_t(rt_expires);
2790 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2791 0, dev, expires, flags,
2794 fib6_info_release(rt);
2797 /* Try to figure out our local address for this prefix */
2799 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2800 struct in6_addr addr;
2801 bool tokenized = false, dev_addr_generated = false;
2803 if (pinfo->prefix_len == 64) {
2804 memcpy(&addr, &pinfo->prefix, 8);
2806 if (!ipv6_addr_any(&in6_dev->token)) {
2807 read_lock_bh(&in6_dev->lock);
2808 memcpy(addr.s6_addr + 8,
2809 in6_dev->token.s6_addr + 8, 8);
2810 read_unlock_bh(&in6_dev->lock);
2812 } else if (is_addr_mode_generate_stable(in6_dev) &&
2813 !ipv6_generate_stable_address(&addr, 0,
2815 addr_flags |= IFA_F_STABLE_PRIVACY;
2817 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2818 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2821 dev_addr_generated = true;
2825 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2830 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2833 tokenized, valid_lft,
2838 /* Ignore error case here because previous prefix add addr was
2839 * successful which will be notified.
2841 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2842 addr_type, addr_flags, sllao,
2843 tokenized, valid_lft,
2845 dev_addr_generated);
2847 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2849 in6_dev_put(in6_dev);
2852 static int addrconf_set_sit_dstaddr(struct net *net, struct net_device *dev,
2853 struct in6_ifreq *ireq)
2855 struct ip_tunnel_parm p = { };
2858 if (!(ipv6_addr_type(&ireq->ifr6_addr) & IPV6_ADDR_COMPATv4))
2859 return -EADDRNOTAVAIL;
2861 p.iph.daddr = ireq->ifr6_addr.s6_addr32[3];
2864 p.iph.protocol = IPPROTO_IPV6;
2867 if (!dev->netdev_ops->ndo_tunnel_ctl)
2869 err = dev->netdev_ops->ndo_tunnel_ctl(dev, &p, SIOCADDTUNNEL);
2873 dev = __dev_get_by_name(net, p.name);
2876 return dev_open(dev, NULL);
2880 * Set destination address.
2881 * Special case for SIT interfaces where we create a new "virtual"
2884 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2886 struct net_device *dev;
2887 struct in6_ifreq ireq;
2890 if (!IS_ENABLED(CONFIG_IPV6_SIT))
2892 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2896 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2897 if (dev && dev->type == ARPHRD_SIT)
2898 err = addrconf_set_sit_dstaddr(net, dev, &ireq);
2903 static int ipv6_mc_config(struct sock *sk, bool join,
2904 const struct in6_addr *addr, int ifindex)
2912 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2914 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2921 * Manual configuration of address on an interface
2923 static int inet6_addr_add(struct net *net, int ifindex,
2924 struct ifa6_config *cfg,
2925 struct netlink_ext_ack *extack)
2927 struct inet6_ifaddr *ifp;
2928 struct inet6_dev *idev;
2929 struct net_device *dev;
2930 unsigned long timeout;
2936 if (cfg->plen > 128)
2939 /* check the lifetime */
2940 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
2943 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64)
2946 dev = __dev_get_by_index(net, ifindex);
2950 idev = addrconf_add_dev(dev);
2952 return PTR_ERR(idev);
2954 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
2955 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2956 true, cfg->pfx, ifindex);
2962 cfg->scope = ipv6_addr_scope(cfg->pfx);
2964 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
2965 if (addrconf_finite_timeout(timeout)) {
2966 expires = jiffies_to_clock_t(timeout * HZ);
2967 cfg->valid_lft = timeout;
2968 flags = RTF_EXPIRES;
2972 cfg->ifa_flags |= IFA_F_PERMANENT;
2975 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
2976 if (addrconf_finite_timeout(timeout)) {
2978 cfg->ifa_flags |= IFA_F_DEPRECATED;
2979 cfg->preferred_lft = timeout;
2982 ifp = ipv6_add_addr(idev, cfg, true, extack);
2984 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
2985 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
2986 ifp->rt_priority, dev, expires,
2990 /* Send a netlink notification if DAD is enabled and
2991 * optimistic flag is not set
2993 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD)))
2994 ipv6_ifa_notify(0, ifp);
2996 * Note that section 3.1 of RFC 4429 indicates
2997 * that the Optimistic flag should not be set for
2998 * manually configured addresses
3000 addrconf_dad_start(ifp);
3001 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR)
3002 manage_tempaddrs(idev, ifp, cfg->valid_lft,
3003 cfg->preferred_lft, true, jiffies);
3005 addrconf_verify_rtnl();
3007 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
3008 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false,
3012 return PTR_ERR(ifp);
3015 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
3016 const struct in6_addr *pfx, unsigned int plen)
3018 struct inet6_ifaddr *ifp;
3019 struct inet6_dev *idev;
3020 struct net_device *dev;
3025 dev = __dev_get_by_index(net, ifindex);
3029 idev = __in6_dev_get(dev);
3033 read_lock_bh(&idev->lock);
3034 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3035 if (ifp->prefix_len == plen &&
3036 ipv6_addr_equal(pfx, &ifp->addr)) {
3038 read_unlock_bh(&idev->lock);
3040 if (!(ifp->flags & IFA_F_TEMPORARY) &&
3041 (ifa_flags & IFA_F_MANAGETEMPADDR))
3042 manage_tempaddrs(idev, ifp, 0, 0, false,
3045 addrconf_verify_rtnl();
3046 if (ipv6_addr_is_multicast(pfx)) {
3047 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
3048 false, pfx, dev->ifindex);
3053 read_unlock_bh(&idev->lock);
3054 return -EADDRNOTAVAIL;
3058 int addrconf_add_ifaddr(struct net *net, void __user *arg)
3060 struct ifa6_config cfg = {
3061 .ifa_flags = IFA_F_PERMANENT,
3062 .preferred_lft = INFINITY_LIFE_TIME,
3063 .valid_lft = INFINITY_LIFE_TIME,
3065 struct in6_ifreq ireq;
3068 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3071 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3074 cfg.pfx = &ireq.ifr6_addr;
3075 cfg.plen = ireq.ifr6_prefixlen;
3078 err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL);
3083 int addrconf_del_ifaddr(struct net *net, void __user *arg)
3085 struct in6_ifreq ireq;
3088 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3091 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3095 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
3096 ireq.ifr6_prefixlen);
3101 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
3102 int plen, int scope)
3104 struct inet6_ifaddr *ifp;
3105 struct ifa6_config cfg = {
3108 .ifa_flags = IFA_F_PERMANENT,
3109 .valid_lft = INFINITY_LIFE_TIME,
3110 .preferred_lft = INFINITY_LIFE_TIME,
3114 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
3116 spin_lock_bh(&ifp->lock);
3117 ifp->flags &= ~IFA_F_TENTATIVE;
3118 spin_unlock_bh(&ifp->lock);
3119 rt_genid_bump_ipv6(dev_net(idev->dev));
3120 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3125 #if IS_ENABLED(CONFIG_IPV6_SIT) || IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE)
3126 static void add_v4_addrs(struct inet6_dev *idev)
3128 struct in6_addr addr;
3129 struct net_device *dev;
3130 struct net *net = dev_net(idev->dev);
3131 int scope, plen, offset = 0;
3136 memset(&addr, 0, sizeof(struct in6_addr));
3137 /* in case of IP6GRE the dev_addr is an IPv6 and therefore we use only the last 4 bytes */
3138 if (idev->dev->addr_len == sizeof(struct in6_addr))
3139 offset = sizeof(struct in6_addr) - 4;
3140 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr + offset, 4);
3142 if (!(idev->dev->flags & IFF_POINTOPOINT) && idev->dev->type == ARPHRD_SIT) {
3143 scope = IPV6_ADDR_COMPATv4;
3145 pflags |= RTF_NONEXTHOP;
3147 if (idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_NONE)
3150 addr.s6_addr32[0] = htonl(0xfe800000);
3155 if (addr.s6_addr32[3]) {
3156 add_addr(idev, &addr, plen, scope);
3157 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags,
3162 for_each_netdev(net, dev) {
3163 struct in_device *in_dev = __in_dev_get_rtnl(dev);
3164 if (in_dev && (dev->flags & IFF_UP)) {
3165 struct in_ifaddr *ifa;
3168 in_dev_for_each_ifa_rtnl(ifa, in_dev) {
3169 addr.s6_addr32[3] = ifa->ifa_local;
3171 if (ifa->ifa_scope == RT_SCOPE_LINK)
3173 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
3174 if (idev->dev->flags&IFF_POINTOPOINT)
3179 add_addr(idev, &addr, plen, flag);
3180 addrconf_prefix_route(&addr, plen, 0, idev->dev,
3181 0, pflags, GFP_KERNEL);
3188 static void init_loopback(struct net_device *dev)
3190 struct inet6_dev *idev;
3196 idev = ipv6_find_idev(dev);
3198 pr_debug("%s: add_dev failed\n", __func__);
3202 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
3205 void addrconf_add_linklocal(struct inet6_dev *idev,
3206 const struct in6_addr *addr, u32 flags)
3208 struct ifa6_config cfg = {
3211 .ifa_flags = flags | IFA_F_PERMANENT,
3212 .valid_lft = INFINITY_LIFE_TIME,
3213 .preferred_lft = INFINITY_LIFE_TIME,
3216 struct inet6_ifaddr *ifp;
3218 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3219 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad ||
3220 idev->cnf.optimistic_dad) &&
3221 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
3222 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
3225 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
3227 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev,
3229 addrconf_dad_start(ifp);
3233 EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
3235 static bool ipv6_reserved_interfaceid(struct in6_addr address)
3237 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3240 if (address.s6_addr32[2] == htonl(0x02005eff) &&
3241 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3244 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3245 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3251 static int ipv6_generate_stable_address(struct in6_addr *address,
3253 const struct inet6_dev *idev)
3255 static DEFINE_SPINLOCK(lock);
3256 static __u32 digest[SHA1_DIGEST_WORDS];
3257 static __u32 workspace[SHA1_WORKSPACE_WORDS];
3260 char __data[SHA1_BLOCK_SIZE];
3262 struct in6_addr secret;
3264 unsigned char hwaddr[MAX_ADDR_LEN];
3269 struct in6_addr secret;
3270 struct in6_addr temp;
3271 struct net *net = dev_net(idev->dev);
3273 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3275 if (idev->cnf.stable_secret.initialized)
3276 secret = idev->cnf.stable_secret.secret;
3277 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3278 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3283 spin_lock_bh(&lock);
3286 memset(&data, 0, sizeof(data));
3287 memset(workspace, 0, sizeof(workspace));
3288 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3289 data.prefix[0] = address->s6_addr32[0];
3290 data.prefix[1] = address->s6_addr32[1];
3291 data.secret = secret;
3292 data.dad_count = dad_count;
3294 sha1_transform(digest, data.__data, workspace);
3297 temp.s6_addr32[2] = (__force __be32)digest[0];
3298 temp.s6_addr32[3] = (__force __be32)digest[1];
3300 spin_unlock_bh(&lock);
3302 if (ipv6_reserved_interfaceid(temp)) {
3304 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3313 static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3315 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3319 s = &idev->cnf.stable_secret;
3320 get_random_bytes(&s->secret, sizeof(s->secret));
3321 s->initialized = true;
3324 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3326 struct in6_addr addr;
3328 /* no link local addresses on L3 master devices */
3329 if (netif_is_l3_master(idev->dev))
3332 /* no link local addresses on devices flagged as slaves */
3333 if (idev->dev->flags & IFF_SLAVE)
3336 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3338 switch (idev->cnf.addr_gen_mode) {
3339 case IN6_ADDR_GEN_MODE_RANDOM:
3340 ipv6_gen_mode_random_init(idev);
3342 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
3343 if (!ipv6_generate_stable_address(&addr, 0, idev))
3344 addrconf_add_linklocal(idev, &addr,
3345 IFA_F_STABLE_PRIVACY);
3346 else if (prefix_route)
3347 addrconf_prefix_route(&addr, 64, 0, idev->dev,
3350 case IN6_ADDR_GEN_MODE_EUI64:
3351 /* addrconf_add_linklocal also adds a prefix_route and we
3352 * only need to care about prefix routes if ipv6_generate_eui64
3353 * couldn't generate one.
3355 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3356 addrconf_add_linklocal(idev, &addr, 0);
3357 else if (prefix_route)
3358 addrconf_prefix_route(&addr, 64, 0, idev->dev,
3361 case IN6_ADDR_GEN_MODE_NONE:
3363 /* will not add any link local address */
3368 static void addrconf_dev_config(struct net_device *dev)
3370 struct inet6_dev *idev;
3374 if ((dev->type != ARPHRD_ETHER) &&
3375 (dev->type != ARPHRD_FDDI) &&
3376 (dev->type != ARPHRD_ARCNET) &&
3377 (dev->type != ARPHRD_INFINIBAND) &&
3378 (dev->type != ARPHRD_IEEE1394) &&
3379 (dev->type != ARPHRD_TUNNEL6) &&
3380 (dev->type != ARPHRD_6LOWPAN) &&
3381 (dev->type != ARPHRD_TUNNEL) &&
3382 (dev->type != ARPHRD_NONE) &&
3383 (dev->type != ARPHRD_RAWIP)) {
3384 /* Alas, we support only Ethernet autoconfiguration. */
3385 idev = __in6_dev_get(dev);
3386 if (!IS_ERR_OR_NULL(idev) && dev->flags & IFF_UP &&
3387 dev->flags & IFF_MULTICAST)
3392 idev = addrconf_add_dev(dev);
3396 /* this device type has no EUI support */
3397 if (dev->type == ARPHRD_NONE &&
3398 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3399 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
3401 addrconf_addr_gen(idev, false);
3404 #if IS_ENABLED(CONFIG_IPV6_SIT)
3405 static void addrconf_sit_config(struct net_device *dev)
3407 struct inet6_dev *idev;
3412 * Configure the tunnel with one of our IPv4
3413 * addresses... we should configure all of
3414 * our v4 addrs in the tunnel
3417 idev = ipv6_find_idev(dev);
3419 pr_debug("%s: add_dev failed\n", __func__);
3423 if (dev->priv_flags & IFF_ISATAP) {
3424 addrconf_addr_gen(idev, false);
3430 if (dev->flags&IFF_POINTOPOINT)
3431 addrconf_add_mroute(dev);
3435 #if IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE)
3436 static void addrconf_gre_config(struct net_device *dev)
3438 struct inet6_dev *idev;
3442 idev = ipv6_find_idev(dev);
3444 pr_debug("%s: add_dev failed\n", __func__);
3448 if (dev->type == ARPHRD_ETHER) {
3449 addrconf_addr_gen(idev, true);
3455 if (dev->flags & IFF_POINTOPOINT)
3456 addrconf_add_mroute(dev);
3460 static void addrconf_init_auto_addrs(struct net_device *dev)
3462 switch (dev->type) {
3463 #if IS_ENABLED(CONFIG_IPV6_SIT)
3465 addrconf_sit_config(dev);
3468 #if IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE)
3471 addrconf_gre_config(dev);
3474 case ARPHRD_LOOPBACK:
3479 addrconf_dev_config(dev);
3484 static int fixup_permanent_addr(struct net *net,
3485 struct inet6_dev *idev,
3486 struct inet6_ifaddr *ifp)
3488 /* !fib6_node means the host route was removed from the
3489 * FIB, for example, if 'lo' device is taken down. In that
3490 * case regenerate the host route.
3492 if (!ifp->rt || !ifp->rt->fib6_node) {
3493 struct fib6_info *f6i, *prev;
3495 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false,
3498 return PTR_ERR(f6i);
3500 /* ifp->rt can be accessed outside of rtnl */
3501 spin_lock(&ifp->lock);
3504 spin_unlock(&ifp->lock);
3506 fib6_info_release(prev);
3509 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3510 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3511 ifp->rt_priority, idev->dev, 0, 0,
3515 if (ifp->state == INET6_IFADDR_STATE_PREDAD)
3516 addrconf_dad_start(ifp);
3521 static void addrconf_permanent_addr(struct net *net, struct net_device *dev)
3523 struct inet6_ifaddr *ifp, *tmp;
3524 struct inet6_dev *idev;
3526 idev = __in6_dev_get(dev);
3530 write_lock_bh(&idev->lock);
3532 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3533 if ((ifp->flags & IFA_F_PERMANENT) &&
3534 fixup_permanent_addr(net, idev, ifp) < 0) {
3535 write_unlock_bh(&idev->lock);
3538 write_lock_bh(&idev->lock);
3540 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3541 idev->dev->name, &ifp->addr);
3545 write_unlock_bh(&idev->lock);
3548 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3551 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3552 struct netdev_notifier_change_info *change_info;
3553 struct netdev_notifier_changeupper_info *info;
3554 struct inet6_dev *idev = __in6_dev_get(dev);
3555 struct net *net = dev_net(dev);
3556 int run_pending = 0;
3560 case NETDEV_REGISTER:
3561 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3562 idev = ipv6_add_dev(dev);
3564 return notifier_from_errno(PTR_ERR(idev));
3568 case NETDEV_CHANGEMTU:
3569 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3570 if (dev->mtu < IPV6_MIN_MTU) {
3571 addrconf_ifdown(dev, dev != net->loopback_dev);
3576 rt6_mtu_change(dev, dev->mtu);
3577 idev->cnf.mtu6 = dev->mtu;
3581 /* allocate new idev */
3582 idev = ipv6_add_dev(dev);
3586 /* device is still not ready */
3587 if (!(idev->if_flags & IF_READY))
3594 if (dev->flags & IFF_SLAVE)
3597 if (idev && idev->cnf.disable_ipv6)
3600 if (event == NETDEV_UP) {
3601 /* restore routes for permanent addresses */
3602 addrconf_permanent_addr(net, dev);
3604 if (!addrconf_link_ready(dev)) {
3605 /* device is not ready yet. */
3606 pr_debug("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3611 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3612 idev = ipv6_add_dev(dev);
3614 if (!IS_ERR_OR_NULL(idev)) {
3615 idev->if_flags |= IF_READY;
3618 } else if (event == NETDEV_CHANGE) {
3619 if (!addrconf_link_ready(dev)) {
3620 /* device is still not ready. */
3621 rt6_sync_down_dev(dev, event);
3625 if (!IS_ERR_OR_NULL(idev)) {
3626 if (idev->if_flags & IF_READY) {
3627 /* device is already configured -
3628 * but resend MLD reports, we might
3629 * have roamed and need to update
3630 * multicast snooping switches
3634 if (change_info->flags_changed & IFF_NOARP)
3635 addrconf_dad_run(idev, true);
3636 rt6_sync_up(dev, RTNH_F_LINKDOWN);
3639 idev->if_flags |= IF_READY;
3642 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3648 addrconf_init_auto_addrs(dev);
3650 if (!IS_ERR_OR_NULL(idev)) {
3652 addrconf_dad_run(idev, false);
3654 /* Device has an address by now */
3655 rt6_sync_up(dev, RTNH_F_DEAD);
3658 * If the MTU changed during the interface down,
3659 * when the interface up, the changed MTU must be
3660 * reflected in the idev as well as routers.
3662 if (idev->cnf.mtu6 != dev->mtu &&
3663 dev->mtu >= IPV6_MIN_MTU) {
3664 rt6_mtu_change(dev, dev->mtu);
3665 idev->cnf.mtu6 = dev->mtu;
3667 idev->tstamp = jiffies;
3668 inet6_ifinfo_notify(RTM_NEWLINK, idev);
3671 * If the changed mtu during down is lower than
3672 * IPV6_MIN_MTU stop IPv6 on this interface.
3674 if (dev->mtu < IPV6_MIN_MTU)
3675 addrconf_ifdown(dev, dev != net->loopback_dev);
3680 case NETDEV_UNREGISTER:
3682 * Remove all addresses from this interface.
3684 addrconf_ifdown(dev, event != NETDEV_DOWN);
3687 case NETDEV_CHANGENAME:
3689 snmp6_unregister_dev(idev);
3690 addrconf_sysctl_unregister(idev);
3691 err = addrconf_sysctl_register(idev);
3693 return notifier_from_errno(err);
3694 err = snmp6_register_dev(idev);
3696 addrconf_sysctl_unregister(idev);
3697 return notifier_from_errno(err);
3702 case NETDEV_PRE_TYPE_CHANGE:
3703 case NETDEV_POST_TYPE_CHANGE:
3705 addrconf_type_change(dev, event);
3708 case NETDEV_CHANGEUPPER:
3711 /* flush all routes if dev is linked to or unlinked from
3712 * an L3 master device (e.g., VRF)
3714 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3715 addrconf_ifdown(dev, false);
3722 * addrconf module should be notified of a device going up
3724 static struct notifier_block ipv6_dev_notf = {
3725 .notifier_call = addrconf_notify,
3726 .priority = ADDRCONF_NOTIFY_PRIORITY,
3729 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3731 struct inet6_dev *idev;
3734 idev = __in6_dev_get(dev);
3736 if (event == NETDEV_POST_TYPE_CHANGE)
3737 ipv6_mc_remap(idev);
3738 else if (event == NETDEV_PRE_TYPE_CHANGE)
3739 ipv6_mc_unmap(idev);
3742 static bool addr_is_local(const struct in6_addr *addr)
3744 return ipv6_addr_type(addr) &
3745 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3748 static int addrconf_ifdown(struct net_device *dev, bool unregister)
3750 unsigned long event = unregister ? NETDEV_UNREGISTER : NETDEV_DOWN;
3751 struct net *net = dev_net(dev);
3752 struct inet6_dev *idev;
3753 struct inet6_ifaddr *ifa;
3754 LIST_HEAD(tmp_addr_list);
3755 bool keep_addr = false;
3761 rt6_disable_ip(dev, event);
3763 idev = __in6_dev_get(dev);
3768 * Step 1: remove reference to ipv6 device from parent device.
3774 /* protected by rtnl_lock */
3775 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3777 /* Step 1.5: remove snmp6 entry */
3778 snmp6_unregister_dev(idev);
3782 /* combine the user config with event to determine if permanent
3783 * addresses are to be removed from address hash table
3785 if (!unregister && !idev->cnf.disable_ipv6) {
3786 /* aggregate the system setting and interface setting */
3787 int _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3790 _keep_addr = idev->cnf.keep_addr_on_down;
3792 keep_addr = (_keep_addr > 0);
3795 /* Step 2: clear hash table */
3796 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3797 struct hlist_head *h = &inet6_addr_lst[i];
3799 spin_lock_bh(&addrconf_hash_lock);
3801 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3802 if (ifa->idev == idev) {
3803 addrconf_del_dad_work(ifa);
3804 /* combined flag + permanent flag decide if
3805 * address is retained on a down event
3808 !(ifa->flags & IFA_F_PERMANENT) ||
3809 addr_is_local(&ifa->addr)) {
3810 hlist_del_init_rcu(&ifa->addr_lst);
3815 spin_unlock_bh(&addrconf_hash_lock);
3818 write_lock_bh(&idev->lock);
3820 addrconf_del_rs_timer(idev);
3822 /* Step 2: clear flags for stateless addrconf, repeated down
3825 was_ready = idev->if_flags & IF_READY;
3827 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3829 /* Step 3: clear tempaddr list */
3830 while (!list_empty(&idev->tempaddr_list)) {
3831 ifa = list_first_entry(&idev->tempaddr_list,
3832 struct inet6_ifaddr, tmp_list);
3833 list_del(&ifa->tmp_list);
3834 write_unlock_bh(&idev->lock);
3835 spin_lock_bh(&ifa->lock);
3838 in6_ifa_put(ifa->ifpub);
3841 spin_unlock_bh(&ifa->lock);
3843 write_lock_bh(&idev->lock);
3846 list_for_each_entry(ifa, &idev->addr_list, if_list)
3847 list_add_tail(&ifa->if_list_aux, &tmp_addr_list);
3848 write_unlock_bh(&idev->lock);
3850 while (!list_empty(&tmp_addr_list)) {
3851 struct fib6_info *rt = NULL;
3854 ifa = list_first_entry(&tmp_addr_list,
3855 struct inet6_ifaddr, if_list_aux);
3856 list_del(&ifa->if_list_aux);
3858 addrconf_del_dad_work(ifa);
3860 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3861 !addr_is_local(&ifa->addr);
3863 spin_lock_bh(&ifa->lock);
3866 /* set state to skip the notifier below */
3867 state = INET6_IFADDR_STATE_DEAD;
3868 ifa->state = INET6_IFADDR_STATE_PREDAD;
3869 if (!(ifa->flags & IFA_F_NODAD))
3870 ifa->flags |= IFA_F_TENTATIVE;
3876 ifa->state = INET6_IFADDR_STATE_DEAD;
3879 spin_unlock_bh(&ifa->lock);
3882 ip6_del_rt(net, rt, false);
3884 if (state != INET6_IFADDR_STATE_DEAD) {
3885 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3886 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3888 if (idev->cnf.forwarding)
3889 addrconf_leave_anycast(ifa);
3890 addrconf_leave_solict(ifa->idev, &ifa->addr);
3894 write_lock_bh(&idev->lock);
3895 list_del_rcu(&ifa->if_list);
3896 write_unlock_bh(&idev->lock);
3901 /* Step 5: Discard anycast and multicast list */
3903 ipv6_ac_destroy_dev(idev);
3904 ipv6_mc_destroy_dev(idev);
3905 } else if (was_ready) {
3909 idev->tstamp = jiffies;
3912 /* Last: Shot the device (if unregistered) */
3914 addrconf_sysctl_unregister(idev);
3915 neigh_parms_release(&nd_tbl, idev->nd_parms);
3916 neigh_ifdown(&nd_tbl, dev);
3922 static void addrconf_rs_timer(struct timer_list *t)
3924 struct inet6_dev *idev = from_timer(idev, t, rs_timer);
3925 struct net_device *dev = idev->dev;
3926 struct in6_addr lladdr;
3928 write_lock(&idev->lock);
3929 if (idev->dead || !(idev->if_flags & IF_READY))
3932 if (!ipv6_accept_ra(idev))
3935 /* Announcement received after solicitation was sent */
3936 if (idev->if_flags & IF_RA_RCVD)
3939 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
3940 write_unlock(&idev->lock);
3941 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3942 ndisc_send_rs(dev, &lladdr,
3943 &in6addr_linklocal_allrouters);
3947 write_lock(&idev->lock);
3948 idev->rs_interval = rfc3315_s14_backoff_update(
3949 idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
3950 /* The wait after the last probe can be shorter */
3951 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3952 idev->cnf.rtr_solicits) ?
3953 idev->cnf.rtr_solicit_delay :
3957 * Note: we do not support deprecated "all on-link"
3958 * assumption any longer.
3960 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3964 write_unlock(&idev->lock);
3970 * Duplicate Address Detection
3972 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3974 unsigned long rand_num;
3975 struct inet6_dev *idev = ifp->idev;
3978 if (ifp->flags & IFA_F_OPTIMISTIC)
3981 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3984 if (idev->cnf.enhanced_dad ||
3985 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) {
3987 get_random_bytes(&nonce, 6);
3990 ifp->dad_nonce = nonce;
3991 ifp->dad_probes = idev->cnf.dad_transmits;
3992 addrconf_mod_dad_work(ifp, rand_num);
3995 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3997 struct inet6_dev *idev = ifp->idev;
3998 struct net_device *dev = idev->dev;
3999 bool bump_id, notify = false;
4002 addrconf_join_solict(dev, &ifp->addr);
4004 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
4006 read_lock_bh(&idev->lock);
4007 spin_lock(&ifp->lock);
4008 if (ifp->state == INET6_IFADDR_STATE_DEAD)
4012 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
4013 (net->ipv6.devconf_all->accept_dad < 1 &&
4014 idev->cnf.accept_dad < 1) ||
4015 !(ifp->flags&IFA_F_TENTATIVE) ||
4016 ifp->flags & IFA_F_NODAD) {
4017 bool send_na = false;
4019 if (ifp->flags & IFA_F_TENTATIVE &&
4020 !(ifp->flags & IFA_F_OPTIMISTIC))
4022 bump_id = ifp->flags & IFA_F_TENTATIVE;
4023 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
4024 spin_unlock(&ifp->lock);
4025 read_unlock_bh(&idev->lock);
4027 addrconf_dad_completed(ifp, bump_id, send_na);
4031 if (!(idev->if_flags & IF_READY)) {
4032 spin_unlock(&ifp->lock);
4033 read_unlock_bh(&idev->lock);
4035 * If the device is not ready:
4036 * - keep it tentative if it is a permanent address.
4037 * - otherwise, kill it.
4040 addrconf_dad_stop(ifp, 0);
4045 * Optimistic nodes can start receiving
4048 if (ifp->flags & IFA_F_OPTIMISTIC) {
4049 ip6_ins_rt(net, ifp->rt);
4050 if (ipv6_use_optimistic_addr(net, idev)) {
4051 /* Because optimistic nodes can use this address,
4052 * notify listeners. If DAD fails, RTM_DELADDR is sent.
4058 addrconf_dad_kick(ifp);
4060 spin_unlock(&ifp->lock);
4061 read_unlock_bh(&idev->lock);
4063 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4066 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
4068 bool begin_dad = false;
4070 spin_lock_bh(&ifp->lock);
4071 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
4072 ifp->state = INET6_IFADDR_STATE_PREDAD;
4075 spin_unlock_bh(&ifp->lock);
4078 addrconf_mod_dad_work(ifp, 0);
4081 static void addrconf_dad_work(struct work_struct *w)
4083 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
4084 struct inet6_ifaddr,
4086 struct inet6_dev *idev = ifp->idev;
4087 bool bump_id, disable_ipv6 = false;
4088 struct in6_addr mcaddr;
4094 } action = DAD_PROCESS;
4098 spin_lock_bh(&ifp->lock);
4099 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
4101 ifp->state = INET6_IFADDR_STATE_DAD;
4102 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
4104 ifp->state = INET6_IFADDR_STATE_POSTDAD;
4106 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 ||
4107 idev->cnf.accept_dad > 1) &&
4108 !idev->cnf.disable_ipv6 &&
4109 !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
4110 struct in6_addr addr;
4112 addr.s6_addr32[0] = htonl(0xfe800000);
4113 addr.s6_addr32[1] = 0;
4115 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
4116 ipv6_addr_equal(&ifp->addr, &addr)) {
4117 /* DAD failed for link-local based on MAC */
4118 idev->cnf.disable_ipv6 = 1;
4120 pr_info("%s: IPv6 being disabled!\n",
4121 ifp->idev->dev->name);
4122 disable_ipv6 = true;
4126 spin_unlock_bh(&ifp->lock);
4128 if (action == DAD_BEGIN) {
4129 addrconf_dad_begin(ifp);
4131 } else if (action == DAD_ABORT) {
4133 addrconf_dad_stop(ifp, 1);
4135 addrconf_ifdown(idev->dev, false);
4139 if (!ifp->dad_probes && addrconf_dad_end(ifp))
4142 write_lock_bh(&idev->lock);
4143 if (idev->dead || !(idev->if_flags & IF_READY)) {
4144 write_unlock_bh(&idev->lock);
4148 spin_lock(&ifp->lock);
4149 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
4150 spin_unlock(&ifp->lock);
4151 write_unlock_bh(&idev->lock);
4155 if (ifp->dad_probes == 0) {
4156 bool send_na = false;
4159 * DAD was successful
4162 if (ifp->flags & IFA_F_TENTATIVE &&
4163 !(ifp->flags & IFA_F_OPTIMISTIC))
4165 bump_id = ifp->flags & IFA_F_TENTATIVE;
4166 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
4167 spin_unlock(&ifp->lock);
4168 write_unlock_bh(&idev->lock);
4170 addrconf_dad_completed(ifp, bump_id, send_na);
4176 addrconf_mod_dad_work(ifp,
4177 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME),
4179 spin_unlock(&ifp->lock);
4180 write_unlock_bh(&idev->lock);
4182 /* send a neighbour solicitation for our addr */
4183 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
4184 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
4191 /* ifp->idev must be at least read locked */
4192 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
4194 struct inet6_ifaddr *ifpiter;
4195 struct inet6_dev *idev = ifp->idev;
4197 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
4198 if (ifpiter->scope > IFA_LINK)
4200 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
4201 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
4202 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
4209 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
4212 struct net_device *dev = ifp->idev->dev;
4213 struct in6_addr lladdr;
4214 bool send_rs, send_mld;
4216 addrconf_del_dad_work(ifp);
4219 * Configure the address for reception. Now it is valid.
4222 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4224 /* If added prefix is link local and we are prepared to process
4225 router advertisements, start sending router solicitations.
4228 read_lock_bh(&ifp->idev->lock);
4229 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
4230 send_rs = send_mld &&
4231 ipv6_accept_ra(ifp->idev) &&
4232 ifp->idev->cnf.rtr_solicits != 0 &&
4233 (dev->flags & IFF_LOOPBACK) == 0 &&
4234 (dev->type != ARPHRD_TUNNEL);
4235 read_unlock_bh(&ifp->idev->lock);
4237 /* While dad is in progress mld report's source address is in6_addrany.
4238 * Resend with proper ll now.
4241 ipv6_mc_dad_complete(ifp->idev);
4243 /* send unsolicited NA if enabled */
4245 (ifp->idev->cnf.ndisc_notify ||
4246 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) {
4247 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr,
4248 /*router=*/ !!ifp->idev->cnf.forwarding,
4249 /*solicited=*/ false, /*override=*/ true,
4255 * If a host as already performed a random delay
4256 * [...] as part of DAD [...] there is no need
4257 * to delay again before sending the first RS
4259 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
4261 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
4263 write_lock_bh(&ifp->idev->lock);
4264 spin_lock(&ifp->lock);
4265 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4266 ifp->idev->cnf.rtr_solicit_interval);
4267 ifp->idev->rs_probes = 1;
4268 ifp->idev->if_flags |= IF_RS_SENT;
4269 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
4270 spin_unlock(&ifp->lock);
4271 write_unlock_bh(&ifp->idev->lock);
4275 rt_genid_bump_ipv6(dev_net(dev));
4277 /* Make sure that a new temporary address will be created
4278 * before this temporary address becomes deprecated.
4280 if (ifp->flags & IFA_F_TEMPORARY)
4281 addrconf_verify_rtnl();
4284 static void addrconf_dad_run(struct inet6_dev *idev, bool restart)
4286 struct inet6_ifaddr *ifp;
4288 read_lock_bh(&idev->lock);
4289 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4290 spin_lock(&ifp->lock);
4291 if ((ifp->flags & IFA_F_TENTATIVE &&
4292 ifp->state == INET6_IFADDR_STATE_DAD) || restart) {
4294 ifp->state = INET6_IFADDR_STATE_PREDAD;
4295 addrconf_dad_kick(ifp);
4297 spin_unlock(&ifp->lock);
4299 read_unlock_bh(&idev->lock);
4302 #ifdef CONFIG_PROC_FS
4303 struct if6_iter_state {
4304 struct seq_net_private p;
4309 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
4311 struct if6_iter_state *state = seq->private;
4312 struct net *net = seq_file_net(seq);
4313 struct inet6_ifaddr *ifa = NULL;
4316 /* initial bucket if pos is 0 */
4322 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
4323 hlist_for_each_entry_rcu(ifa, &inet6_addr_lst[state->bucket],
4325 if (!net_eq(dev_net(ifa->idev->dev), net))
4327 /* sync with offset */
4328 if (p < state->offset) {
4335 /* prepare for next bucket */
4342 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4343 struct inet6_ifaddr *ifa)
4345 struct if6_iter_state *state = seq->private;
4346 struct net *net = seq_file_net(seq);
4348 hlist_for_each_entry_continue_rcu(ifa, addr_lst) {
4349 if (!net_eq(dev_net(ifa->idev->dev), net))
4356 while (++state->bucket < IN6_ADDR_HSIZE) {
4357 hlist_for_each_entry_rcu(ifa,
4358 &inet6_addr_lst[state->bucket], addr_lst) {
4359 if (!net_eq(dev_net(ifa->idev->dev), net))
4368 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4372 return if6_get_first(seq, *pos);
4375 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4377 struct inet6_ifaddr *ifa;
4379 ifa = if6_get_next(seq, v);
4384 static void if6_seq_stop(struct seq_file *seq, void *v)
4390 static int if6_seq_show(struct seq_file *seq, void *v)
4392 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4393 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
4395 ifp->idev->dev->ifindex,
4399 ifp->idev->dev->name);
4403 static const struct seq_operations if6_seq_ops = {
4404 .start = if6_seq_start,
4405 .next = if6_seq_next,
4406 .show = if6_seq_show,
4407 .stop = if6_seq_stop,
4410 static int __net_init if6_proc_net_init(struct net *net)
4412 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops,
4413 sizeof(struct if6_iter_state)))
4418 static void __net_exit if6_proc_net_exit(struct net *net)
4420 remove_proc_entry("if_inet6", net->proc_net);
4423 static struct pernet_operations if6_proc_net_ops = {
4424 .init = if6_proc_net_init,
4425 .exit = if6_proc_net_exit,
4428 int __init if6_proc_init(void)
4430 return register_pernet_subsys(&if6_proc_net_ops);
4433 void if6_proc_exit(void)
4435 unregister_pernet_subsys(&if6_proc_net_ops);
4437 #endif /* CONFIG_PROC_FS */
4439 #if IS_ENABLED(CONFIG_IPV6_MIP6)
4440 /* Check if address is a home address configured on any interface. */
4441 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
4443 unsigned int hash = inet6_addr_hash(net, addr);
4444 struct inet6_ifaddr *ifp = NULL;
4448 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
4449 if (!net_eq(dev_net(ifp->idev->dev), net))
4451 if (ipv6_addr_equal(&ifp->addr, addr) &&
4452 (ifp->flags & IFA_F_HOMEADDRESS)) {
4462 /* RFC6554 has some algorithm to avoid loops in segment routing by
4463 * checking if the segments contains any of a local interface address.
4467 * To detect loops in the SRH, a router MUST determine if the SRH
4468 * includes multiple addresses assigned to any interface on that router.
4469 * If such addresses appear more than once and are separated by at least
4470 * one address not assigned to that router.
4472 int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs,
4473 unsigned char nsegs)
4475 const struct in6_addr *addr;
4476 int i, ret = 0, found = 0;
4477 struct inet6_ifaddr *ifp;
4478 bool separated = false;
4483 for (i = 0; i < nsegs; i++) {
4485 hash = inet6_addr_hash(net, addr);
4488 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
4489 if (!net_eq(dev_net(ifp->idev->dev), net))
4492 if (ipv6_addr_equal(&ifp->addr, addr)) {
4499 if (found > 1 && separated) {
4516 * Periodic address status verification
4519 static void addrconf_verify_rtnl(void)
4521 unsigned long now, next, next_sec, next_sched;
4522 struct inet6_ifaddr *ifp;
4529 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
4531 cancel_delayed_work(&addr_chk_work);
4533 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
4535 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
4538 /* When setting preferred_lft to a value not zero or
4539 * infinity, while valid_lft is infinity
4540 * IFA_F_PERMANENT has a non-infinity life time.
4542 if ((ifp->flags & IFA_F_PERMANENT) &&
4543 (ifp->prefered_lft == INFINITY_LIFE_TIME))
4546 spin_lock(&ifp->lock);
4547 /* We try to batch several events at once. */
4548 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
4550 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4551 age >= ifp->valid_lft) {
4552 spin_unlock(&ifp->lock);
4554 rcu_read_unlock_bh();
4558 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4559 spin_unlock(&ifp->lock);
4561 } else if (age >= ifp->prefered_lft) {
4562 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
4565 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4567 ifp->flags |= IFA_F_DEPRECATED;
4570 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4571 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
4572 next = ifp->tstamp + ifp->valid_lft * HZ;
4574 spin_unlock(&ifp->lock);
4579 ipv6_ifa_notify(0, ifp);
4583 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4584 !(ifp->flags&IFA_F_TENTATIVE)) {
4585 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4586 ifp->idev->cnf.dad_transmits *
4587 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME), HZ/100) / HZ;
4589 if (age >= ifp->prefered_lft - regen_advance) {
4590 struct inet6_ifaddr *ifpub = ifp->ifpub;
4591 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4592 next = ifp->tstamp + ifp->prefered_lft * HZ;
4593 if (!ifp->regen_count && ifpub) {
4596 in6_ifa_hold(ifpub);
4597 spin_unlock(&ifp->lock);
4599 spin_lock(&ifpub->lock);
4600 ifpub->regen_count = 0;
4601 spin_unlock(&ifpub->lock);
4602 rcu_read_unlock_bh();
4603 ipv6_create_tempaddr(ifpub, true);
4609 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4610 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4611 spin_unlock(&ifp->lock);
4613 /* ifp->prefered_lft <= ifp->valid_lft */
4614 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4615 next = ifp->tstamp + ifp->prefered_lft * HZ;
4616 spin_unlock(&ifp->lock);
4621 next_sec = round_jiffies_up(next);
4624 /* If rounded timeout is accurate enough, accept it. */
4625 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4626 next_sched = next_sec;
4628 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4629 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4630 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4632 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4633 now, next, next_sec, next_sched);
4634 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
4635 rcu_read_unlock_bh();
4638 static void addrconf_verify_work(struct work_struct *w)
4641 addrconf_verify_rtnl();
4645 static void addrconf_verify(void)
4647 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4650 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4651 struct in6_addr **peer_pfx)
4653 struct in6_addr *pfx = NULL;
4658 pfx = nla_data(addr);
4661 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4663 pfx = nla_data(local);
4669 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4670 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4671 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4672 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
4673 [IFA_FLAGS] = { .len = sizeof(u32) },
4674 [IFA_RT_PRIORITY] = { .len = sizeof(u32) },
4675 [IFA_TARGET_NETNSID] = { .type = NLA_S32 },
4679 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
4680 struct netlink_ext_ack *extack)
4682 struct net *net = sock_net(skb->sk);
4683 struct ifaddrmsg *ifm;
4684 struct nlattr *tb[IFA_MAX+1];
4685 struct in6_addr *pfx, *peer_pfx;
4689 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4690 ifa_ipv6_policy, extack);
4694 ifm = nlmsg_data(nlh);
4695 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4699 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4701 /* We ignore other flags so far. */
4702 ifa_flags &= IFA_F_MANAGETEMPADDR;
4704 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4705 ifm->ifa_prefixlen);
4708 static int modify_prefix_route(struct inet6_ifaddr *ifp,
4709 unsigned long expires, u32 flags,
4712 struct fib6_info *f6i;
4715 f6i = addrconf_get_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
4717 ifp->idev->dev, 0, RTF_DEFAULT, true);
4721 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF;
4722 if (f6i->fib6_metric != prio) {
4723 /* delete old one */
4724 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false);
4727 addrconf_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
4729 ifp->rt_priority, ifp->idev->dev,
4730 expires, flags, GFP_KERNEL);
4733 fib6_clean_expires(f6i);
4735 fib6_set_expires(f6i, expires);
4737 fib6_info_release(f6i);
4743 static int inet6_addr_modify(struct inet6_ifaddr *ifp, struct ifa6_config *cfg)
4747 unsigned long timeout;
4748 bool was_managetempaddr;
4749 bool had_prefixroute;
4750 bool new_peer = false;
4754 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
4757 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR &&
4758 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4761 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED)
4762 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC;
4764 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
4765 if (addrconf_finite_timeout(timeout)) {
4766 expires = jiffies_to_clock_t(timeout * HZ);
4767 cfg->valid_lft = timeout;
4768 flags = RTF_EXPIRES;
4772 cfg->ifa_flags |= IFA_F_PERMANENT;
4775 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
4776 if (addrconf_finite_timeout(timeout)) {
4778 cfg->ifa_flags |= IFA_F_DEPRECATED;
4779 cfg->preferred_lft = timeout;
4782 if (cfg->peer_pfx &&
4783 memcmp(&ifp->peer_addr, cfg->peer_pfx, sizeof(struct in6_addr))) {
4784 if (!ipv6_addr_any(&ifp->peer_addr))
4785 cleanup_prefix_route(ifp, expires, true, true);
4789 spin_lock_bh(&ifp->lock);
4790 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4791 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4792 !(ifp->flags & IFA_F_NOPREFIXROUTE);
4793 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4794 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4795 IFA_F_NOPREFIXROUTE);
4796 ifp->flags |= cfg->ifa_flags;
4797 ifp->tstamp = jiffies;
4798 ifp->valid_lft = cfg->valid_lft;
4799 ifp->prefered_lft = cfg->preferred_lft;
4801 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority)
4802 ifp->rt_priority = cfg->rt_priority;
4805 ifp->peer_addr = *cfg->peer_pfx;
4807 spin_unlock_bh(&ifp->lock);
4808 if (!(ifp->flags&IFA_F_TENTATIVE))
4809 ipv6_ifa_notify(0, ifp);
4811 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
4814 if (had_prefixroute)
4815 rc = modify_prefix_route(ifp, expires, flags, false);
4817 /* prefix route could have been deleted; if so restore it */
4818 if (rc == -ENOENT) {
4819 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
4820 ifp->rt_priority, ifp->idev->dev,
4821 expires, flags, GFP_KERNEL);
4824 if (had_prefixroute && !ipv6_addr_any(&ifp->peer_addr))
4825 rc = modify_prefix_route(ifp, expires, flags, true);
4827 if (rc == -ENOENT && !ipv6_addr_any(&ifp->peer_addr)) {
4828 addrconf_prefix_route(&ifp->peer_addr, ifp->prefix_len,
4829 ifp->rt_priority, ifp->idev->dev,
4830 expires, flags, GFP_KERNEL);
4832 } else if (had_prefixroute) {
4833 enum cleanup_prefix_rt_t action;
4834 unsigned long rt_expires;
4836 write_lock_bh(&ifp->idev->lock);
4837 action = check_cleanup_prefix_route(ifp, &rt_expires);
4838 write_unlock_bh(&ifp->idev->lock);
4840 if (action != CLEANUP_PREFIX_RT_NOP) {
4841 cleanup_prefix_route(ifp, rt_expires,
4842 action == CLEANUP_PREFIX_RT_DEL, false);
4846 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4847 if (was_managetempaddr &&
4848 !(ifp->flags & IFA_F_MANAGETEMPADDR)) {
4850 cfg->preferred_lft = 0;
4852 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft,
4853 cfg->preferred_lft, !was_managetempaddr,
4857 addrconf_verify_rtnl();
4863 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
4864 struct netlink_ext_ack *extack)
4866 struct net *net = sock_net(skb->sk);
4867 struct ifaddrmsg *ifm;
4868 struct nlattr *tb[IFA_MAX+1];
4869 struct in6_addr *peer_pfx;
4870 struct inet6_ifaddr *ifa;
4871 struct net_device *dev;
4872 struct inet6_dev *idev;
4873 struct ifa6_config cfg;
4876 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4877 ifa_ipv6_policy, extack);
4881 memset(&cfg, 0, sizeof(cfg));
4883 ifm = nlmsg_data(nlh);
4884 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4888 cfg.peer_pfx = peer_pfx;
4889 cfg.plen = ifm->ifa_prefixlen;
4890 if (tb[IFA_RT_PRIORITY])
4891 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]);
4893 cfg.valid_lft = INFINITY_LIFE_TIME;
4894 cfg.preferred_lft = INFINITY_LIFE_TIME;
4896 if (tb[IFA_CACHEINFO]) {
4897 struct ifa_cacheinfo *ci;
4899 ci = nla_data(tb[IFA_CACHEINFO]);
4900 cfg.valid_lft = ci->ifa_valid;
4901 cfg.preferred_lft = ci->ifa_prefered;
4904 dev = __dev_get_by_index(net, ifm->ifa_index);
4909 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]);
4911 cfg.ifa_flags = ifm->ifa_flags;
4913 /* We ignore other flags so far. */
4914 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS |
4915 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE |
4916 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC;
4918 idev = ipv6_find_idev(dev);
4920 return PTR_ERR(idev);
4922 if (!ipv6_allow_optimistic_dad(net, idev))
4923 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC;
4925 if (cfg.ifa_flags & IFA_F_NODAD &&
4926 cfg.ifa_flags & IFA_F_OPTIMISTIC) {
4927 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive");
4931 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1);
4934 * It would be best to check for !NLM_F_CREATE here but
4935 * userspace already relies on not having to provide this.
4937 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack);
4940 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4941 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4944 err = inet6_addr_modify(ifa, &cfg);
4951 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4952 u8 scope, int ifindex)
4954 struct ifaddrmsg *ifm;
4956 ifm = nlmsg_data(nlh);
4957 ifm->ifa_family = AF_INET6;
4958 ifm->ifa_prefixlen = prefixlen;
4959 ifm->ifa_flags = flags;
4960 ifm->ifa_scope = scope;
4961 ifm->ifa_index = ifindex;
4964 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4965 unsigned long tstamp, u32 preferred, u32 valid)
4967 struct ifa_cacheinfo ci;
4969 ci.cstamp = cstamp_delta(cstamp);
4970 ci.tstamp = cstamp_delta(tstamp);
4971 ci.ifa_prefered = preferred;
4972 ci.ifa_valid = valid;
4974 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4977 static inline int rt_scope(int ifa_scope)
4979 if (ifa_scope & IFA_HOST)
4980 return RT_SCOPE_HOST;
4981 else if (ifa_scope & IFA_LINK)
4982 return RT_SCOPE_LINK;
4983 else if (ifa_scope & IFA_SITE)
4984 return RT_SCOPE_SITE;
4986 return RT_SCOPE_UNIVERSE;
4989 static inline int inet6_ifaddr_msgsize(void)
4991 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4992 + nla_total_size(16) /* IFA_LOCAL */
4993 + nla_total_size(16) /* IFA_ADDRESS */
4994 + nla_total_size(sizeof(struct ifa_cacheinfo))
4995 + nla_total_size(4) /* IFA_FLAGS */
4996 + nla_total_size(4) /* IFA_RT_PRIORITY */;
5005 struct inet6_fill_args {
5012 enum addr_type_t type;
5015 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
5016 struct inet6_fill_args *args)
5018 struct nlmsghdr *nlh;
5019 u32 preferred, valid;
5021 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5022 sizeof(struct ifaddrmsg), args->flags);
5026 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
5027 ifa->idev->dev->ifindex);
5029 if (args->netnsid >= 0 &&
5030 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
5033 spin_lock_bh(&ifa->lock);
5034 if (!((ifa->flags&IFA_F_PERMANENT) &&
5035 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
5036 preferred = ifa->prefered_lft;
5037 valid = ifa->valid_lft;
5038 if (preferred != INFINITY_LIFE_TIME) {
5039 long tval = (jiffies - ifa->tstamp)/HZ;
5040 if (preferred > tval)
5044 if (valid != INFINITY_LIFE_TIME) {
5052 preferred = INFINITY_LIFE_TIME;
5053 valid = INFINITY_LIFE_TIME;
5055 spin_unlock_bh(&ifa->lock);
5057 if (!ipv6_addr_any(&ifa->peer_addr)) {
5058 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
5059 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
5062 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
5065 if (ifa->rt_priority &&
5066 nla_put_u32(skb, IFA_RT_PRIORITY, ifa->rt_priority))
5069 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
5072 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
5075 nlmsg_end(skb, nlh);
5079 nlmsg_cancel(skb, nlh);
5083 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
5084 struct inet6_fill_args *args)
5086 struct nlmsghdr *nlh;
5087 u8 scope = RT_SCOPE_UNIVERSE;
5088 int ifindex = ifmca->idev->dev->ifindex;
5090 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
5091 scope = RT_SCOPE_SITE;
5093 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5094 sizeof(struct ifaddrmsg), args->flags);
5098 if (args->netnsid >= 0 &&
5099 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) {
5100 nlmsg_cancel(skb, nlh);
5104 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
5105 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
5106 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
5107 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
5108 nlmsg_cancel(skb, nlh);
5112 nlmsg_end(skb, nlh);
5116 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
5117 struct inet6_fill_args *args)
5119 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt);
5120 int ifindex = dev ? dev->ifindex : 1;
5121 struct nlmsghdr *nlh;
5122 u8 scope = RT_SCOPE_UNIVERSE;
5124 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
5125 scope = RT_SCOPE_SITE;
5127 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5128 sizeof(struct ifaddrmsg), args->flags);
5132 if (args->netnsid >= 0 &&
5133 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) {
5134 nlmsg_cancel(skb, nlh);
5138 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
5139 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
5140 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
5141 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
5142 nlmsg_cancel(skb, nlh);
5146 nlmsg_end(skb, nlh);
5150 /* called with rcu_read_lock() */
5151 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
5152 struct netlink_callback *cb, int s_ip_idx,
5153 struct inet6_fill_args *fillargs)
5155 struct ifmcaddr6 *ifmca;
5156 struct ifacaddr6 *ifaca;
5160 read_lock_bh(&idev->lock);
5161 switch (fillargs->type) {
5162 case UNICAST_ADDR: {
5163 struct inet6_ifaddr *ifa;
5164 fillargs->event = RTM_NEWADDR;
5166 /* unicast address incl. temp addr */
5167 list_for_each_entry(ifa, &idev->addr_list, if_list) {
5168 if (ip_idx < s_ip_idx)
5170 err = inet6_fill_ifaddr(skb, ifa, fillargs);
5173 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
5179 case MULTICAST_ADDR:
5180 read_unlock_bh(&idev->lock);
5181 fillargs->event = RTM_GETMULTICAST;
5183 /* multicast address */
5184 for (ifmca = rtnl_dereference(idev->mc_list);
5186 ifmca = rtnl_dereference(ifmca->next), ip_idx++) {
5187 if (ip_idx < s_ip_idx)
5189 err = inet6_fill_ifmcaddr(skb, ifmca, fillargs);
5193 read_lock_bh(&idev->lock);
5196 fillargs->event = RTM_GETANYCAST;
5197 /* anycast address */
5198 for (ifaca = idev->ac_list; ifaca;
5199 ifaca = ifaca->aca_next, ip_idx++) {
5200 if (ip_idx < s_ip_idx)
5202 err = inet6_fill_ifacaddr(skb, ifaca, fillargs);
5210 read_unlock_bh(&idev->lock);
5211 cb->args[2] = ip_idx;
5215 static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh,
5216 struct inet6_fill_args *fillargs,
5217 struct net **tgt_net, struct sock *sk,
5218 struct netlink_callback *cb)
5220 struct netlink_ext_ack *extack = cb->extack;
5221 struct nlattr *tb[IFA_MAX+1];
5222 struct ifaddrmsg *ifm;
5225 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5226 NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request");
5230 ifm = nlmsg_data(nlh);
5231 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5232 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request");
5236 fillargs->ifindex = ifm->ifa_index;
5237 if (fillargs->ifindex) {
5238 cb->answer_flags |= NLM_F_DUMP_FILTERED;
5239 fillargs->flags |= NLM_F_DUMP_FILTERED;
5242 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5243 ifa_ipv6_policy, extack);
5247 for (i = 0; i <= IFA_MAX; ++i) {
5251 if (i == IFA_TARGET_NETNSID) {
5254 fillargs->netnsid = nla_get_s32(tb[i]);
5255 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid);
5257 fillargs->netnsid = -1;
5258 NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id");
5259 return PTR_ERR(net);
5263 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request");
5271 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
5272 enum addr_type_t type)
5274 const struct nlmsghdr *nlh = cb->nlh;
5275 struct inet6_fill_args fillargs = {
5276 .portid = NETLINK_CB(cb->skb).portid,
5277 .seq = cb->nlh->nlmsg_seq,
5278 .flags = NLM_F_MULTI,
5282 struct net *tgt_net = sock_net(skb->sk);
5283 int idx, s_idx, s_ip_idx;
5285 struct net_device *dev;
5286 struct inet6_dev *idev;
5287 struct hlist_head *head;
5291 s_idx = idx = cb->args[1];
5292 s_ip_idx = cb->args[2];
5294 if (cb->strict_check) {
5295 err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net,
5301 if (fillargs.ifindex) {
5302 dev = __dev_get_by_index(tgt_net, fillargs.ifindex);
5307 idev = __in6_dev_get(dev);
5309 err = in6_dump_addrs(idev, skb, cb, s_ip_idx,
5319 cb->seq = atomic_read(&tgt_net->ipv6.dev_addr_genid) ^ tgt_net->dev_base_seq;
5320 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5322 head = &tgt_net->dev_index_head[h];
5323 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5326 if (h > s_h || idx > s_idx)
5328 idev = __in6_dev_get(dev);
5332 if (in6_dump_addrs(idev, skb, cb, s_ip_idx,
5344 if (fillargs.netnsid >= 0)
5347 return skb->len ? : err;
5350 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
5352 enum addr_type_t type = UNICAST_ADDR;
5354 return inet6_dump_addr(skb, cb, type);
5357 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
5359 enum addr_type_t type = MULTICAST_ADDR;
5361 return inet6_dump_addr(skb, cb, type);
5365 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
5367 enum addr_type_t type = ANYCAST_ADDR;
5369 return inet6_dump_addr(skb, cb, type);
5372 static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb,
5373 const struct nlmsghdr *nlh,
5375 struct netlink_ext_ack *extack)
5377 struct ifaddrmsg *ifm;
5380 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5381 NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request");
5385 if (!netlink_strict_get_check(skb))
5386 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
5387 ifa_ipv6_policy, extack);
5389 ifm = nlmsg_data(nlh);
5390 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5391 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request");
5395 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5396 ifa_ipv6_policy, extack);
5400 for (i = 0; i <= IFA_MAX; i++) {
5405 case IFA_TARGET_NETNSID:
5410 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request");
5418 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
5419 struct netlink_ext_ack *extack)
5421 struct net *tgt_net = sock_net(in_skb->sk);
5422 struct inet6_fill_args fillargs = {
5423 .portid = NETLINK_CB(in_skb).portid,
5424 .seq = nlh->nlmsg_seq,
5425 .event = RTM_NEWADDR,
5429 struct ifaddrmsg *ifm;
5430 struct nlattr *tb[IFA_MAX+1];
5431 struct in6_addr *addr = NULL, *peer;
5432 struct net_device *dev = NULL;
5433 struct inet6_ifaddr *ifa;
5434 struct sk_buff *skb;
5437 err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack);
5441 if (tb[IFA_TARGET_NETNSID]) {
5442 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]);
5444 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk,
5446 if (IS_ERR(tgt_net))
5447 return PTR_ERR(tgt_net);
5450 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
5454 ifm = nlmsg_data(nlh);
5456 dev = dev_get_by_index(tgt_net, ifm->ifa_index);
5458 ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1);
5460 err = -EADDRNOTAVAIL;
5464 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
5470 err = inet6_fill_ifaddr(skb, ifa, &fillargs);
5472 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5473 WARN_ON(err == -EMSGSIZE);
5477 err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid);
5482 if (fillargs.netnsid >= 0)
5488 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
5490 struct sk_buff *skb;
5491 struct net *net = dev_net(ifa->idev->dev);
5492 struct inet6_fill_args fillargs = {
5501 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5505 err = inet6_fill_ifaddr(skb, ifa, &fillargs);
5507 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5508 WARN_ON(err == -EMSGSIZE);
5512 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
5516 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
5519 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
5520 __s32 *array, int bytes)
5522 BUG_ON(bytes < (DEVCONF_MAX * 4));
5524 memset(array, 0, bytes);
5525 array[DEVCONF_FORWARDING] = cnf->forwarding;
5526 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
5527 array[DEVCONF_MTU6] = cnf->mtu6;
5528 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
5529 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
5530 array[DEVCONF_AUTOCONF] = cnf->autoconf;
5531 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
5532 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
5533 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
5534 jiffies_to_msecs(cnf->rtr_solicit_interval);
5535 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
5536 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
5537 array[DEVCONF_RTR_SOLICIT_DELAY] =
5538 jiffies_to_msecs(cnf->rtr_solicit_delay);
5539 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
5540 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
5541 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
5542 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
5543 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
5544 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
5545 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
5546 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
5547 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
5548 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
5549 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
5550 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
5551 array[DEVCONF_RA_DEFRTR_METRIC] = cnf->ra_defrtr_metric;
5552 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
5553 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
5554 #ifdef CONFIG_IPV6_ROUTER_PREF
5555 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
5556 array[DEVCONF_RTR_PROBE_INTERVAL] =
5557 jiffies_to_msecs(cnf->rtr_probe_interval);
5558 #ifdef CONFIG_IPV6_ROUTE_INFO
5559 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen;
5560 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
5563 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
5564 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
5565 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5566 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
5567 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
5569 #ifdef CONFIG_IPV6_MROUTE
5570 array[DEVCONF_MC_FORWARDING] = atomic_read(&cnf->mc_forwarding);
5572 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
5573 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
5574 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5575 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
5576 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
5577 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
5578 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
5579 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
5580 /* we omit DEVCONF_STABLE_SECRET for now */
5581 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
5582 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
5583 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
5584 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
5585 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled;
5586 #ifdef CONFIG_IPV6_SEG6_HMAC
5587 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac;
5589 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad;
5590 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode;
5591 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy;
5592 array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass;
5593 array[DEVCONF_RPL_SEG_ENABLED] = cnf->rpl_seg_enabled;
5594 array[DEVCONF_IOAM6_ENABLED] = cnf->ioam6_enabled;
5595 array[DEVCONF_IOAM6_ID] = cnf->ioam6_id;
5596 array[DEVCONF_IOAM6_ID_WIDE] = cnf->ioam6_id_wide;
5597 array[DEVCONF_ACCEPT_RA_MIN_LFT] = cnf->accept_ra_min_lft;
5600 static inline size_t inet6_ifla6_size(void)
5602 return nla_total_size(4) /* IFLA_INET6_FLAGS */
5603 + nla_total_size(sizeof(struct ifla_cacheinfo))
5604 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5605 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
5606 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
5607 + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */
5608 + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */
5609 + nla_total_size(4) /* IFLA_INET6_RA_MTU */
5613 static inline size_t inet6_if_nlmsg_size(void)
5615 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5616 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5617 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5618 + nla_total_size(4) /* IFLA_MTU */
5619 + nla_total_size(4) /* IFLA_LINK */
5620 + nla_total_size(1) /* IFLA_OPERSTATE */
5621 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
5624 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
5628 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
5631 /* Use put_unaligned() because stats may not be aligned for u64. */
5632 put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5633 for (i = 1; i < ICMP6_MIB_MAX; i++)
5634 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
5636 memset(&stats[ICMP6_MIB_MAX], 0, pad);
5639 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
5640 int bytes, size_t syncpoff)
5643 u64 buff[IPSTATS_MIB_MAX];
5644 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5648 memset(buff, 0, sizeof(buff));
5649 buff[0] = IPSTATS_MIB_MAX;
5651 for_each_possible_cpu(c) {
5652 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5653 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5656 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5657 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
5660 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5664 case IFLA_INET6_STATS:
5665 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5666 offsetof(struct ipstats_mib, syncp));
5668 case IFLA_INET6_ICMP6STATS:
5669 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
5674 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5675 u32 ext_filter_mask)
5678 struct ifla_cacheinfo ci;
5680 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5681 goto nla_put_failure;
5682 ci.max_reasm_len = IPV6_MAXPLEN;
5683 ci.tstamp = cstamp_delta(idev->tstamp);
5684 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
5685 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
5686 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5687 goto nla_put_failure;
5688 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
5690 goto nla_put_failure;
5691 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5693 /* XXX - MC not implemented */
5695 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5698 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
5700 goto nla_put_failure;
5701 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5703 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
5705 goto nla_put_failure;
5706 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5708 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
5710 goto nla_put_failure;
5711 read_lock_bh(&idev->lock);
5712 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5713 read_unlock_bh(&idev->lock);
5715 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode))
5716 goto nla_put_failure;
5719 nla_put_u32(skb, IFLA_INET6_RA_MTU, idev->ra_mtu))
5720 goto nla_put_failure;
5728 static size_t inet6_get_link_af_size(const struct net_device *dev,
5729 u32 ext_filter_mask)
5731 if (!__in6_dev_get(dev))
5734 return inet6_ifla6_size();
5737 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5738 u32 ext_filter_mask)
5740 struct inet6_dev *idev = __in6_dev_get(dev);
5745 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
5751 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token,
5752 struct netlink_ext_ack *extack)
5754 struct inet6_ifaddr *ifp;
5755 struct net_device *dev = idev->dev;
5756 bool clear_token, update_rs = false;
5757 struct in6_addr ll_addr;
5764 if (dev->flags & IFF_LOOPBACK) {
5765 NL_SET_ERR_MSG_MOD(extack, "Device is loopback");
5769 if (dev->flags & IFF_NOARP) {
5770 NL_SET_ERR_MSG_MOD(extack,
5771 "Device does not do neighbour discovery");
5775 if (!ipv6_accept_ra(idev)) {
5776 NL_SET_ERR_MSG_MOD(extack,
5777 "Router advertisement is disabled on device");
5781 if (idev->cnf.rtr_solicits == 0) {
5782 NL_SET_ERR_MSG(extack,
5783 "Router solicitation is disabled on device");
5787 write_lock_bh(&idev->lock);
5789 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5790 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5792 write_unlock_bh(&idev->lock);
5794 clear_token = ipv6_addr_any(token);
5798 if (!idev->dead && (idev->if_flags & IF_READY) &&
5799 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5800 IFA_F_OPTIMISTIC)) {
5801 /* If we're not ready, then normal ifup will take care
5802 * of this. Otherwise, we need to request our rs here.
5804 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5809 write_lock_bh(&idev->lock);
5812 idev->if_flags |= IF_RS_SENT;
5813 idev->rs_interval = rfc3315_s14_backoff_init(
5814 idev->cnf.rtr_solicit_interval);
5815 idev->rs_probes = 1;
5816 addrconf_mod_rs_timer(idev, idev->rs_interval);
5819 /* Well, that's kinda nasty ... */
5820 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5821 spin_lock(&ifp->lock);
5822 if (ifp->tokenized) {
5824 ifp->prefered_lft = 0;
5826 spin_unlock(&ifp->lock);
5829 write_unlock_bh(&idev->lock);
5830 inet6_ifinfo_notify(RTM_NEWLINK, idev);
5831 addrconf_verify_rtnl();
5835 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5836 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5837 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5838 [IFLA_INET6_RA_MTU] = { .type = NLA_REJECT,
5840 "IFLA_INET6_RA_MTU can not be set" },
5843 static int check_addr_gen_mode(int mode)
5845 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5846 mode != IN6_ADDR_GEN_MODE_NONE &&
5847 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5848 mode != IN6_ADDR_GEN_MODE_RANDOM)
5853 static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5856 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5857 !idev->cnf.stable_secret.initialized &&
5858 !net->ipv6.devconf_dflt->stable_secret.initialized)
5863 static int inet6_validate_link_af(const struct net_device *dev,
5864 const struct nlattr *nla,
5865 struct netlink_ext_ack *extack)
5867 struct nlattr *tb[IFLA_INET6_MAX + 1];
5868 struct inet6_dev *idev = NULL;
5872 idev = __in6_dev_get(dev);
5874 return -EAFNOSUPPORT;
5877 err = nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla,
5878 inet6_af_policy, extack);
5882 if (!tb[IFLA_INET6_TOKEN] && !tb[IFLA_INET6_ADDR_GEN_MODE])
5885 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5886 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5888 if (check_addr_gen_mode(mode) < 0)
5890 if (dev && check_stable_privacy(idev, dev_net(dev), mode) < 0)
5897 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla,
5898 struct netlink_ext_ack *extack)
5900 struct inet6_dev *idev = __in6_dev_get(dev);
5901 struct nlattr *tb[IFLA_INET6_MAX + 1];
5905 return -EAFNOSUPPORT;
5907 if (nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0)
5910 if (tb[IFLA_INET6_TOKEN]) {
5911 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]),
5917 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5918 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5920 idev->cnf.addr_gen_mode = mode;
5926 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
5927 u32 portid, u32 seq, int event, unsigned int flags)
5929 struct net_device *dev = idev->dev;
5930 struct ifinfomsg *hdr;
5931 struct nlmsghdr *nlh;
5934 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
5938 hdr = nlmsg_data(nlh);
5939 hdr->ifi_family = AF_INET6;
5941 hdr->ifi_type = dev->type;
5942 hdr->ifi_index = dev->ifindex;
5943 hdr->ifi_flags = dev_get_flags(dev);
5944 hdr->ifi_change = 0;
5946 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5948 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5949 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
5950 (dev->ifindex != dev_get_iflink(dev) &&
5951 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5952 nla_put_u8(skb, IFLA_OPERSTATE,
5953 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
5954 goto nla_put_failure;
5955 protoinfo = nla_nest_start_noflag(skb, IFLA_PROTINFO);
5957 goto nla_put_failure;
5959 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
5960 goto nla_put_failure;
5962 nla_nest_end(skb, protoinfo);
5963 nlmsg_end(skb, nlh);
5967 nlmsg_cancel(skb, nlh);
5971 static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh,
5972 struct netlink_ext_ack *extack)
5974 struct ifinfomsg *ifm;
5976 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5977 NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request");
5981 if (nlmsg_attrlen(nlh, sizeof(*ifm))) {
5982 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header");
5986 ifm = nlmsg_data(nlh);
5987 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
5988 ifm->ifi_change || ifm->ifi_index) {
5989 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request");
5996 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5998 struct net *net = sock_net(skb->sk);
6001 struct net_device *dev;
6002 struct inet6_dev *idev;
6003 struct hlist_head *head;
6005 /* only requests using strict checking can pass data to
6006 * influence the dump
6008 if (cb->strict_check) {
6009 int err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack);
6016 s_idx = cb->args[1];
6019 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
6021 head = &net->dev_index_head[h];
6022 hlist_for_each_entry_rcu(dev, head, index_hlist) {
6025 idev = __in6_dev_get(dev);
6028 if (inet6_fill_ifinfo(skb, idev,
6029 NETLINK_CB(cb->skb).portid,
6031 RTM_NEWLINK, NLM_F_MULTI) < 0)
6045 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
6047 struct sk_buff *skb;
6048 struct net *net = dev_net(idev->dev);
6051 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
6055 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
6057 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
6058 WARN_ON(err == -EMSGSIZE);
6062 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
6066 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
6069 static inline size_t inet6_prefix_nlmsg_size(void)
6071 return NLMSG_ALIGN(sizeof(struct prefixmsg))
6072 + nla_total_size(sizeof(struct in6_addr))
6073 + nla_total_size(sizeof(struct prefix_cacheinfo));
6076 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
6077 struct prefix_info *pinfo, u32 portid, u32 seq,
6078 int event, unsigned int flags)
6080 struct prefixmsg *pmsg;
6081 struct nlmsghdr *nlh;
6082 struct prefix_cacheinfo ci;
6084 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
6088 pmsg = nlmsg_data(nlh);
6089 pmsg->prefix_family = AF_INET6;
6090 pmsg->prefix_pad1 = 0;
6091 pmsg->prefix_pad2 = 0;
6092 pmsg->prefix_ifindex = idev->dev->ifindex;
6093 pmsg->prefix_len = pinfo->prefix_len;
6094 pmsg->prefix_type = pinfo->type;
6095 pmsg->prefix_pad3 = 0;
6096 pmsg->prefix_flags = 0;
6098 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
6099 if (pinfo->autoconf)
6100 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
6102 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
6103 goto nla_put_failure;
6104 ci.preferred_time = ntohl(pinfo->prefered);
6105 ci.valid_time = ntohl(pinfo->valid);
6106 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
6107 goto nla_put_failure;
6108 nlmsg_end(skb, nlh);
6112 nlmsg_cancel(skb, nlh);
6116 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
6117 struct prefix_info *pinfo)
6119 struct sk_buff *skb;
6120 struct net *net = dev_net(idev->dev);
6123 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
6127 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
6129 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
6130 WARN_ON(err == -EMSGSIZE);
6134 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
6138 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
6141 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
6143 struct net *net = dev_net(ifp->idev->dev);
6148 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
6153 * If the address was optimistic we inserted the route at the
6154 * start of our DAD process, so we don't need to do it again.
6155 * If the device was taken down in the middle of the DAD
6156 * cycle there is a race where we could get here without a
6157 * host route, so nothing to insert. That will be fixed when
6158 * the device is brought up.
6160 if (ifp->rt && !rcu_access_pointer(ifp->rt->fib6_node)) {
6161 ip6_ins_rt(net, ifp->rt);
6162 } else if (!ifp->rt && (ifp->idev->dev->flags & IFF_UP)) {
6163 pr_warn("BUG: Address %pI6c on device %s is missing its host route.\n",
6164 &ifp->addr, ifp->idev->dev->name);
6167 if (ifp->idev->cnf.forwarding)
6168 addrconf_join_anycast(ifp);
6169 if (!ipv6_addr_any(&ifp->peer_addr))
6170 addrconf_prefix_route(&ifp->peer_addr, 128,
6171 ifp->rt_priority, ifp->idev->dev,
6175 if (ifp->idev->cnf.forwarding)
6176 addrconf_leave_anycast(ifp);
6177 addrconf_leave_solict(ifp->idev, &ifp->addr);
6178 if (!ipv6_addr_any(&ifp->peer_addr)) {
6179 struct fib6_info *rt;
6181 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
6182 ifp->idev->dev, 0, 0,
6185 ip6_del_rt(net, rt, false);
6188 ip6_del_rt(net, ifp->rt, false);
6191 rt_genid_bump_ipv6(net);
6194 atomic_inc(&net->ipv6.dev_addr_genid);
6197 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
6199 if (likely(ifp->idev->dead == 0))
6200 __ipv6_ifa_notify(event, ifp);
6203 #ifdef CONFIG_SYSCTL
6205 static int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
6206 void *buffer, size_t *lenp, loff_t *ppos)
6208 int *valp = ctl->data;
6211 struct ctl_table lctl;
6215 * ctl->data points to idev->cnf.forwarding, we should
6216 * not modify it until we get the rtnl lock.
6221 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6224 ret = addrconf_fixup_forwarding(ctl, valp, val);
6230 static int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
6231 void *buffer, size_t *lenp, loff_t *ppos)
6233 struct inet6_dev *idev = ctl->extra1;
6234 int min_mtu = IPV6_MIN_MTU;
6235 struct ctl_table lctl;
6238 lctl.extra1 = &min_mtu;
6239 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
6241 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
6244 static void dev_disable_change(struct inet6_dev *idev)
6246 struct netdev_notifier_info info;
6248 if (!idev || !idev->dev)
6251 netdev_notifier_info_init(&info, idev->dev);
6252 if (idev->cnf.disable_ipv6)
6253 addrconf_notify(NULL, NETDEV_DOWN, &info);
6255 addrconf_notify(NULL, NETDEV_UP, &info);
6258 static void addrconf_disable_change(struct net *net, __s32 newf)
6260 struct net_device *dev;
6261 struct inet6_dev *idev;
6263 for_each_netdev(net, dev) {
6264 idev = __in6_dev_get(dev);
6266 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
6267 idev->cnf.disable_ipv6 = newf;
6269 dev_disable_change(idev);
6274 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
6279 if (!rtnl_trylock())
6280 return restart_syscall();
6282 net = (struct net *)table->extra2;
6286 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
6291 if (p == &net->ipv6.devconf_all->disable_ipv6) {
6292 net->ipv6.devconf_dflt->disable_ipv6 = newf;
6293 addrconf_disable_change(net, newf);
6294 } else if ((!newf) ^ (!old))
6295 dev_disable_change((struct inet6_dev *)table->extra1);
6301 static int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
6302 void *buffer, size_t *lenp, loff_t *ppos)
6304 int *valp = ctl->data;
6307 struct ctl_table lctl;
6311 * ctl->data points to idev->cnf.disable_ipv6, we should
6312 * not modify it until we get the rtnl lock.
6317 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6320 ret = addrconf_disable_ipv6(ctl, valp, val);
6326 static int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
6327 void *buffer, size_t *lenp, loff_t *ppos)
6329 int *valp = ctl->data;
6334 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
6337 if (write && old != new) {
6338 struct net *net = ctl->extra2;
6340 if (!rtnl_trylock())
6341 return restart_syscall();
6343 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
6344 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6345 NETCONFA_PROXY_NEIGH,
6346 NETCONFA_IFINDEX_DEFAULT,
6347 net->ipv6.devconf_dflt);
6348 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
6349 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6350 NETCONFA_PROXY_NEIGH,
6351 NETCONFA_IFINDEX_ALL,
6352 net->ipv6.devconf_all);
6354 struct inet6_dev *idev = ctl->extra1;
6356 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6357 NETCONFA_PROXY_NEIGH,
6367 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
6368 void *buffer, size_t *lenp,
6373 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
6374 struct net *net = (struct net *)ctl->extra2;
6375 struct ctl_table tmp = {
6377 .maxlen = sizeof(new_val),
6381 if (!rtnl_trylock())
6382 return restart_syscall();
6384 new_val = *((u32 *)ctl->data);
6386 ret = proc_douintvec(&tmp, write, buffer, lenp, ppos);
6391 if (check_addr_gen_mode(new_val) < 0) {
6397 if (check_stable_privacy(idev, net, new_val) < 0) {
6402 if (idev->cnf.addr_gen_mode != new_val) {
6403 idev->cnf.addr_gen_mode = new_val;
6404 addrconf_init_auto_addrs(idev->dev);
6406 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) {
6407 struct net_device *dev;
6409 net->ipv6.devconf_dflt->addr_gen_mode = new_val;
6410 for_each_netdev(net, dev) {
6411 idev = __in6_dev_get(dev);
6413 idev->cnf.addr_gen_mode != new_val) {
6414 idev->cnf.addr_gen_mode = new_val;
6415 addrconf_init_auto_addrs(idev->dev);
6420 *((u32 *)ctl->data) = new_val;
6429 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
6430 void *buffer, size_t *lenp,
6434 struct in6_addr addr;
6435 char str[IPV6_MAX_STRLEN];
6436 struct ctl_table lctl = *ctl;
6437 struct net *net = ctl->extra2;
6438 struct ipv6_stable_secret *secret = ctl->data;
6440 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
6443 lctl.maxlen = IPV6_MAX_STRLEN;
6446 if (!rtnl_trylock())
6447 return restart_syscall();
6449 if (!write && !secret->initialized) {
6454 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
6455 if (err >= sizeof(str)) {
6460 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
6464 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
6469 secret->initialized = true;
6470 secret->secret = addr;
6472 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
6473 struct net_device *dev;
6475 for_each_netdev(net, dev) {
6476 struct inet6_dev *idev = __in6_dev_get(dev);
6479 idev->cnf.addr_gen_mode =
6480 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
6484 struct inet6_dev *idev = ctl->extra1;
6486 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
6496 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
6497 int write, void *buffer,
6501 int *valp = ctl->data;
6504 struct ctl_table lctl;
6507 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
6508 * we should not modify it until we get the rtnl lock.
6513 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6516 ret = addrconf_fixup_linkdown(ctl, valp, val);
6523 void addrconf_set_nopolicy(struct rt6_info *rt, int action)
6527 rt->dst.flags |= DST_NOPOLICY;
6529 rt->dst.flags &= ~DST_NOPOLICY;
6534 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
6536 struct inet6_ifaddr *ifa;
6538 read_lock_bh(&idev->lock);
6539 list_for_each_entry(ifa, &idev->addr_list, if_list) {
6540 spin_lock(&ifa->lock);
6542 /* host routes only use builtin fib6_nh */
6543 struct fib6_nh *nh = ifa->rt->fib6_nh;
6547 ifa->rt->dst_nopolicy = val ? true : false;
6548 if (nh->rt6i_pcpu) {
6549 for_each_possible_cpu(cpu) {
6550 struct rt6_info **rtp;
6552 rtp = per_cpu_ptr(nh->rt6i_pcpu, cpu);
6553 addrconf_set_nopolicy(*rtp, val);
6558 spin_unlock(&ifa->lock);
6560 read_unlock_bh(&idev->lock);
6564 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val)
6566 struct inet6_dev *idev;
6569 if (!rtnl_trylock())
6570 return restart_syscall();
6574 net = (struct net *)ctl->extra2;
6575 if (valp == &net->ipv6.devconf_dflt->disable_policy) {
6580 if (valp == &net->ipv6.devconf_all->disable_policy) {
6581 struct net_device *dev;
6583 for_each_netdev(net, dev) {
6584 idev = __in6_dev_get(dev);
6586 addrconf_disable_policy_idev(idev, val);
6589 idev = (struct inet6_dev *)ctl->extra1;
6590 addrconf_disable_policy_idev(idev, val);
6597 static int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write,
6598 void *buffer, size_t *lenp, loff_t *ppos)
6600 int *valp = ctl->data;
6603 struct ctl_table lctl;
6608 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6610 if (write && (*valp != val))
6611 ret = addrconf_disable_policy(ctl, valp, val);
6619 static int minus_one = -1;
6620 static const int two_five_five = 255;
6621 static u32 ioam6_if_id_max = U16_MAX;
6623 static const struct ctl_table addrconf_sysctl[] = {
6625 .procname = "forwarding",
6626 .data = &ipv6_devconf.forwarding,
6627 .maxlen = sizeof(int),
6629 .proc_handler = addrconf_sysctl_forward,
6632 .procname = "hop_limit",
6633 .data = &ipv6_devconf.hop_limit,
6634 .maxlen = sizeof(int),
6636 .proc_handler = proc_dointvec_minmax,
6637 .extra1 = (void *)SYSCTL_ONE,
6638 .extra2 = (void *)&two_five_five,
6642 .data = &ipv6_devconf.mtu6,
6643 .maxlen = sizeof(int),
6645 .proc_handler = addrconf_sysctl_mtu,
6648 .procname = "accept_ra",
6649 .data = &ipv6_devconf.accept_ra,
6650 .maxlen = sizeof(int),
6652 .proc_handler = proc_dointvec,
6655 .procname = "accept_redirects",
6656 .data = &ipv6_devconf.accept_redirects,
6657 .maxlen = sizeof(int),
6659 .proc_handler = proc_dointvec,
6662 .procname = "autoconf",
6663 .data = &ipv6_devconf.autoconf,
6664 .maxlen = sizeof(int),
6666 .proc_handler = proc_dointvec,
6669 .procname = "dad_transmits",
6670 .data = &ipv6_devconf.dad_transmits,
6671 .maxlen = sizeof(int),
6673 .proc_handler = proc_dointvec,
6676 .procname = "router_solicitations",
6677 .data = &ipv6_devconf.rtr_solicits,
6678 .maxlen = sizeof(int),
6680 .proc_handler = proc_dointvec_minmax,
6681 .extra1 = &minus_one,
6684 .procname = "router_solicitation_interval",
6685 .data = &ipv6_devconf.rtr_solicit_interval,
6686 .maxlen = sizeof(int),
6688 .proc_handler = proc_dointvec_jiffies,
6691 .procname = "router_solicitation_max_interval",
6692 .data = &ipv6_devconf.rtr_solicit_max_interval,
6693 .maxlen = sizeof(int),
6695 .proc_handler = proc_dointvec_jiffies,
6698 .procname = "router_solicitation_delay",
6699 .data = &ipv6_devconf.rtr_solicit_delay,
6700 .maxlen = sizeof(int),
6702 .proc_handler = proc_dointvec_jiffies,
6705 .procname = "force_mld_version",
6706 .data = &ipv6_devconf.force_mld_version,
6707 .maxlen = sizeof(int),
6709 .proc_handler = proc_dointvec,
6712 .procname = "mldv1_unsolicited_report_interval",
6714 &ipv6_devconf.mldv1_unsolicited_report_interval,
6715 .maxlen = sizeof(int),
6717 .proc_handler = proc_dointvec_ms_jiffies,
6720 .procname = "mldv2_unsolicited_report_interval",
6722 &ipv6_devconf.mldv2_unsolicited_report_interval,
6723 .maxlen = sizeof(int),
6725 .proc_handler = proc_dointvec_ms_jiffies,
6728 .procname = "use_tempaddr",
6729 .data = &ipv6_devconf.use_tempaddr,
6730 .maxlen = sizeof(int),
6732 .proc_handler = proc_dointvec,
6735 .procname = "temp_valid_lft",
6736 .data = &ipv6_devconf.temp_valid_lft,
6737 .maxlen = sizeof(int),
6739 .proc_handler = proc_dointvec,
6742 .procname = "temp_prefered_lft",
6743 .data = &ipv6_devconf.temp_prefered_lft,
6744 .maxlen = sizeof(int),
6746 .proc_handler = proc_dointvec,
6749 .procname = "regen_max_retry",
6750 .data = &ipv6_devconf.regen_max_retry,
6751 .maxlen = sizeof(int),
6753 .proc_handler = proc_dointvec,
6756 .procname = "max_desync_factor",
6757 .data = &ipv6_devconf.max_desync_factor,
6758 .maxlen = sizeof(int),
6760 .proc_handler = proc_dointvec,
6763 .procname = "max_addresses",
6764 .data = &ipv6_devconf.max_addresses,
6765 .maxlen = sizeof(int),
6767 .proc_handler = proc_dointvec,
6770 .procname = "accept_ra_defrtr",
6771 .data = &ipv6_devconf.accept_ra_defrtr,
6772 .maxlen = sizeof(int),
6774 .proc_handler = proc_dointvec,
6777 .procname = "ra_defrtr_metric",
6778 .data = &ipv6_devconf.ra_defrtr_metric,
6779 .maxlen = sizeof(u32),
6781 .proc_handler = proc_douintvec_minmax,
6782 .extra1 = (void *)SYSCTL_ONE,
6785 .procname = "accept_ra_min_hop_limit",
6786 .data = &ipv6_devconf.accept_ra_min_hop_limit,
6787 .maxlen = sizeof(int),
6789 .proc_handler = proc_dointvec,
6792 .procname = "accept_ra_min_lft",
6793 .data = &ipv6_devconf.accept_ra_min_lft,
6794 .maxlen = sizeof(int),
6796 .proc_handler = proc_dointvec,
6799 .procname = "accept_ra_pinfo",
6800 .data = &ipv6_devconf.accept_ra_pinfo,
6801 .maxlen = sizeof(int),
6803 .proc_handler = proc_dointvec,
6805 #ifdef CONFIG_IPV6_ROUTER_PREF
6807 .procname = "accept_ra_rtr_pref",
6808 .data = &ipv6_devconf.accept_ra_rtr_pref,
6809 .maxlen = sizeof(int),
6811 .proc_handler = proc_dointvec,
6814 .procname = "router_probe_interval",
6815 .data = &ipv6_devconf.rtr_probe_interval,
6816 .maxlen = sizeof(int),
6818 .proc_handler = proc_dointvec_jiffies,
6820 #ifdef CONFIG_IPV6_ROUTE_INFO
6822 .procname = "accept_ra_rt_info_min_plen",
6823 .data = &ipv6_devconf.accept_ra_rt_info_min_plen,
6824 .maxlen = sizeof(int),
6826 .proc_handler = proc_dointvec,
6829 .procname = "accept_ra_rt_info_max_plen",
6830 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
6831 .maxlen = sizeof(int),
6833 .proc_handler = proc_dointvec,
6838 .procname = "proxy_ndp",
6839 .data = &ipv6_devconf.proxy_ndp,
6840 .maxlen = sizeof(int),
6842 .proc_handler = addrconf_sysctl_proxy_ndp,
6845 .procname = "accept_source_route",
6846 .data = &ipv6_devconf.accept_source_route,
6847 .maxlen = sizeof(int),
6849 .proc_handler = proc_dointvec,
6851 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
6853 .procname = "optimistic_dad",
6854 .data = &ipv6_devconf.optimistic_dad,
6855 .maxlen = sizeof(int),
6857 .proc_handler = proc_dointvec,
6860 .procname = "use_optimistic",
6861 .data = &ipv6_devconf.use_optimistic,
6862 .maxlen = sizeof(int),
6864 .proc_handler = proc_dointvec,
6867 #ifdef CONFIG_IPV6_MROUTE
6869 .procname = "mc_forwarding",
6870 .data = &ipv6_devconf.mc_forwarding,
6871 .maxlen = sizeof(int),
6873 .proc_handler = proc_dointvec,
6877 .procname = "disable_ipv6",
6878 .data = &ipv6_devconf.disable_ipv6,
6879 .maxlen = sizeof(int),
6881 .proc_handler = addrconf_sysctl_disable,
6884 .procname = "accept_dad",
6885 .data = &ipv6_devconf.accept_dad,
6886 .maxlen = sizeof(int),
6888 .proc_handler = proc_dointvec,
6891 .procname = "force_tllao",
6892 .data = &ipv6_devconf.force_tllao,
6893 .maxlen = sizeof(int),
6895 .proc_handler = proc_dointvec
6898 .procname = "ndisc_notify",
6899 .data = &ipv6_devconf.ndisc_notify,
6900 .maxlen = sizeof(int),
6902 .proc_handler = proc_dointvec
6905 .procname = "suppress_frag_ndisc",
6906 .data = &ipv6_devconf.suppress_frag_ndisc,
6907 .maxlen = sizeof(int),
6909 .proc_handler = proc_dointvec
6912 .procname = "accept_ra_from_local",
6913 .data = &ipv6_devconf.accept_ra_from_local,
6914 .maxlen = sizeof(int),
6916 .proc_handler = proc_dointvec,
6919 .procname = "accept_ra_mtu",
6920 .data = &ipv6_devconf.accept_ra_mtu,
6921 .maxlen = sizeof(int),
6923 .proc_handler = proc_dointvec,
6926 .procname = "stable_secret",
6927 .data = &ipv6_devconf.stable_secret,
6928 .maxlen = IPV6_MAX_STRLEN,
6930 .proc_handler = addrconf_sysctl_stable_secret,
6933 .procname = "use_oif_addrs_only",
6934 .data = &ipv6_devconf.use_oif_addrs_only,
6935 .maxlen = sizeof(int),
6937 .proc_handler = proc_dointvec,
6940 .procname = "ignore_routes_with_linkdown",
6941 .data = &ipv6_devconf.ignore_routes_with_linkdown,
6942 .maxlen = sizeof(int),
6944 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
6947 .procname = "drop_unicast_in_l2_multicast",
6948 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
6949 .maxlen = sizeof(int),
6951 .proc_handler = proc_dointvec,
6954 .procname = "drop_unsolicited_na",
6955 .data = &ipv6_devconf.drop_unsolicited_na,
6956 .maxlen = sizeof(int),
6958 .proc_handler = proc_dointvec,
6961 .procname = "keep_addr_on_down",
6962 .data = &ipv6_devconf.keep_addr_on_down,
6963 .maxlen = sizeof(int),
6965 .proc_handler = proc_dointvec,
6969 .procname = "seg6_enabled",
6970 .data = &ipv6_devconf.seg6_enabled,
6971 .maxlen = sizeof(int),
6973 .proc_handler = proc_dointvec,
6975 #ifdef CONFIG_IPV6_SEG6_HMAC
6977 .procname = "seg6_require_hmac",
6978 .data = &ipv6_devconf.seg6_require_hmac,
6979 .maxlen = sizeof(int),
6981 .proc_handler = proc_dointvec,
6985 .procname = "enhanced_dad",
6986 .data = &ipv6_devconf.enhanced_dad,
6987 .maxlen = sizeof(int),
6989 .proc_handler = proc_dointvec,
6992 .procname = "addr_gen_mode",
6993 .data = &ipv6_devconf.addr_gen_mode,
6994 .maxlen = sizeof(int),
6996 .proc_handler = addrconf_sysctl_addr_gen_mode,
6999 .procname = "disable_policy",
7000 .data = &ipv6_devconf.disable_policy,
7001 .maxlen = sizeof(int),
7003 .proc_handler = addrconf_sysctl_disable_policy,
7006 .procname = "ndisc_tclass",
7007 .data = &ipv6_devconf.ndisc_tclass,
7008 .maxlen = sizeof(int),
7010 .proc_handler = proc_dointvec_minmax,
7011 .extra1 = (void *)SYSCTL_ZERO,
7012 .extra2 = (void *)&two_five_five,
7015 .procname = "rpl_seg_enabled",
7016 .data = &ipv6_devconf.rpl_seg_enabled,
7017 .maxlen = sizeof(int),
7019 .proc_handler = proc_dointvec,
7022 .procname = "ioam6_enabled",
7023 .data = &ipv6_devconf.ioam6_enabled,
7024 .maxlen = sizeof(u8),
7026 .proc_handler = proc_dou8vec_minmax,
7027 .extra1 = (void *)SYSCTL_ZERO,
7028 .extra2 = (void *)SYSCTL_ONE,
7031 .procname = "ioam6_id",
7032 .data = &ipv6_devconf.ioam6_id,
7033 .maxlen = sizeof(u32),
7035 .proc_handler = proc_douintvec_minmax,
7036 .extra1 = (void *)SYSCTL_ZERO,
7037 .extra2 = (void *)&ioam6_if_id_max,
7040 .procname = "ioam6_id_wide",
7041 .data = &ipv6_devconf.ioam6_id_wide,
7042 .maxlen = sizeof(u32),
7044 .proc_handler = proc_douintvec,
7051 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
7052 struct inet6_dev *idev, struct ipv6_devconf *p)
7055 struct ctl_table *table;
7056 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
7058 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
7062 for (i = 0; table[i].data; i++) {
7063 table[i].data += (char *)p - (char *)&ipv6_devconf;
7064 /* If one of these is already set, then it is not safe to
7065 * overwrite either of them: this makes proc_dointvec_minmax
7068 if (!table[i].extra1 && !table[i].extra2) {
7069 table[i].extra1 = idev; /* embedded; no ref */
7070 table[i].extra2 = net;
7074 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
7076 p->sysctl_header = register_net_sysctl(net, path, table);
7077 if (!p->sysctl_header)
7080 if (!strcmp(dev_name, "all"))
7081 ifindex = NETCONFA_IFINDEX_ALL;
7082 else if (!strcmp(dev_name, "default"))
7083 ifindex = NETCONFA_IFINDEX_DEFAULT;
7085 ifindex = idev->dev->ifindex;
7086 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
7096 static void __addrconf_sysctl_unregister(struct net *net,
7097 struct ipv6_devconf *p, int ifindex)
7099 struct ctl_table *table;
7101 if (!p->sysctl_header)
7104 table = p->sysctl_header->ctl_table_arg;
7105 unregister_net_sysctl_table(p->sysctl_header);
7106 p->sysctl_header = NULL;
7109 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
7112 static int addrconf_sysctl_register(struct inet6_dev *idev)
7116 if (!sysctl_dev_name_is_allowed(idev->dev->name))
7119 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
7120 &ndisc_ifinfo_sysctl_change);
7123 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
7126 neigh_sysctl_unregister(idev->nd_parms);
7131 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
7133 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf,
7134 idev->dev->ifindex);
7135 neigh_sysctl_unregister(idev->nd_parms);
7141 static int __net_init addrconf_init_net(struct net *net)
7144 struct ipv6_devconf *all, *dflt;
7146 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
7150 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
7152 goto err_alloc_dflt;
7154 if (!net_eq(net, &init_net)) {
7155 switch (net_inherit_devconf()) {
7156 case 1: /* copy from init_net */
7157 memcpy(all, init_net.ipv6.devconf_all,
7158 sizeof(ipv6_devconf));
7159 memcpy(dflt, init_net.ipv6.devconf_dflt,
7160 sizeof(ipv6_devconf_dflt));
7162 case 3: /* copy from the current netns */
7163 memcpy(all, current->nsproxy->net_ns->ipv6.devconf_all,
7164 sizeof(ipv6_devconf));
7166 current->nsproxy->net_ns->ipv6.devconf_dflt,
7167 sizeof(ipv6_devconf_dflt));
7171 /* use compiled values */
7176 /* these will be inherited by all namespaces */
7177 dflt->autoconf = ipv6_defaults.autoconf;
7178 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
7180 dflt->stable_secret.initialized = false;
7181 all->stable_secret.initialized = false;
7183 net->ipv6.devconf_all = all;
7184 net->ipv6.devconf_dflt = dflt;
7186 #ifdef CONFIG_SYSCTL
7187 err = __addrconf_sysctl_register(net, "all", NULL, all);
7191 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
7197 #ifdef CONFIG_SYSCTL
7199 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
7209 static void __net_exit addrconf_exit_net(struct net *net)
7211 #ifdef CONFIG_SYSCTL
7212 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt,
7213 NETCONFA_IFINDEX_DEFAULT);
7214 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all,
7215 NETCONFA_IFINDEX_ALL);
7217 kfree(net->ipv6.devconf_dflt);
7218 kfree(net->ipv6.devconf_all);
7221 static struct pernet_operations addrconf_ops = {
7222 .init = addrconf_init_net,
7223 .exit = addrconf_exit_net,
7226 static struct rtnl_af_ops inet6_ops __read_mostly = {
7228 .fill_link_af = inet6_fill_link_af,
7229 .get_link_af_size = inet6_get_link_af_size,
7230 .validate_link_af = inet6_validate_link_af,
7231 .set_link_af = inet6_set_link_af,
7235 * Init / cleanup code
7238 int __init addrconf_init(void)
7240 struct inet6_dev *idev;
7243 err = ipv6_addr_label_init();
7245 pr_crit("%s: cannot initialize default policy table: %d\n",
7250 err = register_pernet_subsys(&addrconf_ops);
7254 addrconf_wq = create_workqueue("ipv6_addrconf");
7260 /* The addrconf netdev notifier requires that loopback_dev
7261 * has it's ipv6 private information allocated and setup
7262 * before it can bring up and give link-local addresses
7263 * to other devices which are up.
7265 * Unfortunately, loopback_dev is not necessarily the first
7266 * entry in the global dev_base list of net devices. In fact,
7267 * it is likely to be the very last entry on that list.
7268 * So this causes the notifier registry below to try and
7269 * give link-local addresses to all devices besides loopback_dev
7270 * first, then loopback_dev, which cases all the non-loopback_dev
7271 * devices to fail to get a link-local address.
7273 * So, as a temporary fix, allocate the ipv6 structure for
7274 * loopback_dev first by hand.
7275 * Longer term, all of the dependencies ipv6 has upon the loopback
7276 * device and it being up should be removed.
7279 idev = ipv6_add_dev(init_net.loopback_dev);
7282 err = PTR_ERR(idev);
7286 ip6_route_init_special_entries();
7288 for (i = 0; i < IN6_ADDR_HSIZE; i++)
7289 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
7291 register_netdevice_notifier(&ipv6_dev_notf);
7295 rtnl_af_register(&inet6_ops);
7297 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK,
7298 NULL, inet6_dump_ifinfo, 0);
7302 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR,
7303 inet6_rtm_newaddr, NULL, 0);
7306 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR,
7307 inet6_rtm_deladdr, NULL, 0);
7310 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR,
7311 inet6_rtm_getaddr, inet6_dump_ifaddr,
7312 RTNL_FLAG_DOIT_UNLOCKED);
7315 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST,
7316 NULL, inet6_dump_ifmcaddr, 0);
7319 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST,
7320 NULL, inet6_dump_ifacaddr, 0);
7323 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF,
7324 inet6_netconf_get_devconf,
7325 inet6_netconf_dump_devconf,
7326 RTNL_FLAG_DOIT_UNLOCKED);
7329 err = ipv6_addr_label_rtnl_register();
7335 rtnl_unregister_all(PF_INET6);
7336 rtnl_af_unregister(&inet6_ops);
7337 unregister_netdevice_notifier(&ipv6_dev_notf);
7339 destroy_workqueue(addrconf_wq);
7341 unregister_pernet_subsys(&addrconf_ops);
7343 ipv6_addr_label_cleanup();
7348 void addrconf_cleanup(void)
7350 struct net_device *dev;
7353 unregister_netdevice_notifier(&ipv6_dev_notf);
7354 unregister_pernet_subsys(&addrconf_ops);
7355 ipv6_addr_label_cleanup();
7357 rtnl_af_unregister(&inet6_ops);
7361 /* clean dev list */
7362 for_each_netdev(&init_net, dev) {
7363 if (__in6_dev_get(dev) == NULL)
7365 addrconf_ifdown(dev, true);
7367 addrconf_ifdown(init_net.loopback_dev, true);
7372 spin_lock_bh(&addrconf_hash_lock);
7373 for (i = 0; i < IN6_ADDR_HSIZE; i++)
7374 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
7375 spin_unlock_bh(&addrconf_hash_lock);
7376 cancel_delayed_work(&addr_chk_work);
7379 destroy_workqueue(addrconf_wq);