1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * IPv6 Address [auto]configuration
4 * Linux INET6 implementation
7 * Pedro Roque <roque@di.fc.ul.pt>
8 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
14 * Janos Farkas : delete timer on ifdown
15 * <chexum@bankinf.banki.hu>
16 * Andi Kleen : kill double kfree on module
18 * Maciej W. Rozycki : FDDI support
19 * sekiya@USAGI : Don't send too many RS
21 * yoshfuji@USAGI : Fixed interval between DAD
23 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
24 * address validation timer.
25 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
27 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
28 * address on a same interface.
29 * YOSHIFUJI Hideaki @USAGI : ARCnet support
30 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
32 * YOSHIFUJI Hideaki @USAGI : improved source address
33 * selection; consider scope,
37 #define pr_fmt(fmt) "IPv6: " fmt
39 #include <linux/errno.h>
40 #include <linux/types.h>
41 #include <linux/kernel.h>
42 #include <linux/sched/signal.h>
43 #include <linux/socket.h>
44 #include <linux/sockios.h>
45 #include <linux/net.h>
46 #include <linux/inet.h>
47 #include <linux/in6.h>
48 #include <linux/netdevice.h>
49 #include <linux/if_addr.h>
50 #include <linux/if_arp.h>
51 #include <linux/if_arcnet.h>
52 #include <linux/if_infiniband.h>
53 #include <linux/route.h>
54 #include <linux/inetdevice.h>
55 #include <linux/init.h>
56 #include <linux/slab.h>
58 #include <linux/sysctl.h>
60 #include <linux/capability.h>
61 #include <linux/delay.h>
62 #include <linux/notifier.h>
63 #include <linux/string.h>
64 #include <linux/hash.h>
66 #include <net/net_namespace.h>
70 #include <net/6lowpan.h>
71 #include <net/firewire.h>
73 #include <net/protocol.h>
74 #include <net/ndisc.h>
75 #include <net/ip6_route.h>
76 #include <net/addrconf.h>
79 #include <net/netlink.h>
80 #include <net/pkt_sched.h>
81 #include <net/l3mdev.h>
82 #include <linux/if_tunnel.h>
83 #include <linux/rtnetlink.h>
84 #include <linux/netconf.h>
85 #include <linux/random.h>
86 #include <linux/uaccess.h>
87 #include <asm/unaligned.h>
89 #include <linux/proc_fs.h>
90 #include <linux/seq_file.h>
91 #include <linux/export.h>
92 #include <linux/ioam6.h>
94 #define INFINITY_LIFE_TIME 0xFFFFFFFF
96 #define IPV6_MAX_STRLEN \
97 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
99 static inline u32 cstamp_delta(unsigned long cstamp)
101 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
104 static inline s32 rfc3315_s14_backoff_init(s32 irt)
106 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */
107 u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt;
108 do_div(tmp, 1000000);
112 static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt)
114 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */
115 u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt;
116 do_div(tmp, 1000000);
117 if ((s32)tmp > mrt) {
118 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */
119 tmp = (900000 + prandom_u32() % 200001) * (u64)mrt;
120 do_div(tmp, 1000000);
126 static int addrconf_sysctl_register(struct inet6_dev *idev);
127 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
129 static inline int addrconf_sysctl_register(struct inet6_dev *idev)
134 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
139 static void ipv6_gen_rnd_iid(struct in6_addr *addr);
141 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
142 static int ipv6_count_addresses(const struct inet6_dev *idev);
143 static int ipv6_generate_stable_address(struct in6_addr *addr,
145 const struct inet6_dev *idev);
147 #define IN6_ADDR_HSIZE_SHIFT 8
148 #define IN6_ADDR_HSIZE (1 << IN6_ADDR_HSIZE_SHIFT)
150 * Configured unicast address hash table
152 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
153 static DEFINE_SPINLOCK(addrconf_hash_lock);
155 static void addrconf_verify(void);
156 static void addrconf_verify_rtnl(void);
157 static void addrconf_verify_work(struct work_struct *);
159 static struct workqueue_struct *addrconf_wq;
160 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
162 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
163 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
165 static void addrconf_type_change(struct net_device *dev,
166 unsigned long event);
167 static int addrconf_ifdown(struct net_device *dev, bool unregister);
169 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
171 const struct net_device *dev,
172 u32 flags, u32 noflags,
175 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
176 static void addrconf_dad_work(struct work_struct *w);
177 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
179 static void addrconf_dad_run(struct inet6_dev *idev, bool restart);
180 static void addrconf_rs_timer(struct timer_list *t);
181 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
182 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
184 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
185 struct prefix_info *pinfo);
187 static struct ipv6_devconf ipv6_devconf __read_mostly = {
189 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
190 .mtu6 = IPV6_MIN_MTU,
192 .accept_redirects = 1,
194 .force_mld_version = 0,
195 .mldv1_unsolicited_report_interval = 10 * HZ,
196 .mldv2_unsolicited_report_interval = HZ,
198 .rtr_solicits = MAX_RTR_SOLICITATIONS,
199 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
200 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
201 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
203 .temp_valid_lft = TEMP_VALID_LIFETIME,
204 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
205 .regen_max_retry = REGEN_MAX_RETRY,
206 .max_desync_factor = MAX_DESYNC_FACTOR,
207 .max_addresses = IPV6_MAX_ADDRESSES,
208 .accept_ra_defrtr = 1,
209 .ra_defrtr_metric = IP6_RT_PRIO_USER,
210 .accept_ra_from_local = 0,
211 .accept_ra_min_hop_limit= 1,
212 .accept_ra_pinfo = 1,
213 #ifdef CONFIG_IPV6_ROUTER_PREF
214 .accept_ra_rtr_pref = 1,
215 .rtr_probe_interval = 60 * HZ,
216 #ifdef CONFIG_IPV6_ROUTE_INFO
217 .accept_ra_rt_info_min_plen = 0,
218 .accept_ra_rt_info_max_plen = 0,
222 .accept_source_route = 0, /* we do not accept RH0 by default. */
225 .suppress_frag_ndisc = 1,
228 .initialized = false,
230 .use_oif_addrs_only = 0,
231 .ignore_routes_with_linkdown = 0,
232 .keep_addr_on_down = 0,
234 #ifdef CONFIG_IPV6_SEG6_HMAC
235 .seg6_require_hmac = 0,
238 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
240 .rpl_seg_enabled = 0,
242 .ioam6_id = IOAM6_DEFAULT_IF_ID,
243 .ioam6_id_wide = IOAM6_DEFAULT_IF_ID_WIDE,
246 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
248 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
249 .mtu6 = IPV6_MIN_MTU,
251 .accept_redirects = 1,
253 .force_mld_version = 0,
254 .mldv1_unsolicited_report_interval = 10 * HZ,
255 .mldv2_unsolicited_report_interval = HZ,
257 .rtr_solicits = MAX_RTR_SOLICITATIONS,
258 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
259 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
260 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
262 .temp_valid_lft = TEMP_VALID_LIFETIME,
263 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
264 .regen_max_retry = REGEN_MAX_RETRY,
265 .max_desync_factor = MAX_DESYNC_FACTOR,
266 .max_addresses = IPV6_MAX_ADDRESSES,
267 .accept_ra_defrtr = 1,
268 .ra_defrtr_metric = IP6_RT_PRIO_USER,
269 .accept_ra_from_local = 0,
270 .accept_ra_min_hop_limit= 1,
271 .accept_ra_pinfo = 1,
272 #ifdef CONFIG_IPV6_ROUTER_PREF
273 .accept_ra_rtr_pref = 1,
274 .rtr_probe_interval = 60 * HZ,
275 #ifdef CONFIG_IPV6_ROUTE_INFO
276 .accept_ra_rt_info_min_plen = 0,
277 .accept_ra_rt_info_max_plen = 0,
281 .accept_source_route = 0, /* we do not accept RH0 by default. */
284 .suppress_frag_ndisc = 1,
287 .initialized = false,
289 .use_oif_addrs_only = 0,
290 .ignore_routes_with_linkdown = 0,
291 .keep_addr_on_down = 0,
293 #ifdef CONFIG_IPV6_SEG6_HMAC
294 .seg6_require_hmac = 0,
297 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
299 .rpl_seg_enabled = 0,
301 .ioam6_id = IOAM6_DEFAULT_IF_ID,
302 .ioam6_id_wide = IOAM6_DEFAULT_IF_ID_WIDE,
305 /* Check if link is ready: is it up and is a valid qdisc available */
306 static inline bool addrconf_link_ready(const struct net_device *dev)
308 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev);
311 static void addrconf_del_rs_timer(struct inet6_dev *idev)
313 if (del_timer(&idev->rs_timer))
317 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
319 if (cancel_delayed_work(&ifp->dad_work))
323 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
326 if (!timer_pending(&idev->rs_timer))
328 mod_timer(&idev->rs_timer, jiffies + when);
331 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
335 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay))
339 static int snmp6_alloc_dev(struct inet6_dev *idev)
343 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
344 if (!idev->stats.ipv6)
347 for_each_possible_cpu(i) {
348 struct ipstats_mib *addrconf_stats;
349 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
350 u64_stats_init(&addrconf_stats->syncp);
354 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
356 if (!idev->stats.icmpv6dev)
358 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
360 if (!idev->stats.icmpv6msgdev)
366 kfree(idev->stats.icmpv6dev);
368 free_percpu(idev->stats.ipv6);
373 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
375 struct inet6_dev *ndev;
380 if (dev->mtu < IPV6_MIN_MTU)
381 return ERR_PTR(-EINVAL);
383 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
387 rwlock_init(&ndev->lock);
389 INIT_LIST_HEAD(&ndev->addr_list);
390 timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0);
391 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
393 if (ndev->cnf.stable_secret.initialized)
394 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
396 ndev->cnf.mtu6 = dev->mtu;
398 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
399 if (!ndev->nd_parms) {
403 if (ndev->cnf.forwarding)
404 dev_disable_lro(dev);
405 /* We refer to the device */
408 if (snmp6_alloc_dev(ndev) < 0) {
409 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n",
411 neigh_parms_release(&nd_tbl, ndev->nd_parms);
417 if (snmp6_register_dev(ndev) < 0) {
418 netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n",
419 __func__, dev->name);
423 /* One reference from device. */
424 refcount_set(&ndev->refcnt, 1);
426 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
427 ndev->cnf.accept_dad = -1;
429 #if IS_ENABLED(CONFIG_IPV6_SIT)
430 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
431 pr_info("%s: Disabled Multicast RS\n", dev->name);
432 ndev->cnf.rtr_solicits = 0;
436 INIT_LIST_HEAD(&ndev->tempaddr_list);
437 ndev->desync_factor = U32_MAX;
438 if ((dev->flags&IFF_LOOPBACK) ||
439 dev->type == ARPHRD_TUNNEL ||
440 dev->type == ARPHRD_TUNNEL6 ||
441 dev->type == ARPHRD_SIT ||
442 dev->type == ARPHRD_NONE) {
443 ndev->cnf.use_tempaddr = -1;
446 ndev->token = in6addr_any;
448 if (netif_running(dev) && addrconf_link_ready(dev))
449 ndev->if_flags |= IF_READY;
451 ipv6_mc_init_dev(ndev);
452 ndev->tstamp = jiffies;
453 err = addrconf_sysctl_register(ndev);
455 ipv6_mc_destroy_dev(ndev);
456 snmp6_unregister_dev(ndev);
459 /* protected by rtnl_lock */
460 rcu_assign_pointer(dev->ip6_ptr, ndev);
462 /* Join interface-local all-node multicast group */
463 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
465 /* Join all-node multicast group */
466 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
468 /* Join all-router multicast group if forwarding is set */
469 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
470 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
475 neigh_parms_release(&nd_tbl, ndev->nd_parms);
477 in6_dev_finish_destroy(ndev);
481 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
483 struct inet6_dev *idev;
487 idev = __in6_dev_get(dev);
489 idev = ipv6_add_dev(dev);
494 if (dev->flags&IFF_UP)
499 static int inet6_netconf_msgsize_devconf(int type)
501 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
502 + nla_total_size(4); /* NETCONFA_IFINDEX */
505 if (type == NETCONFA_ALL)
508 if (all || type == NETCONFA_FORWARDING)
509 size += nla_total_size(4);
510 #ifdef CONFIG_IPV6_MROUTE
511 if (all || type == NETCONFA_MC_FORWARDING)
512 size += nla_total_size(4);
514 if (all || type == NETCONFA_PROXY_NEIGH)
515 size += nla_total_size(4);
517 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
518 size += nla_total_size(4);
523 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
524 struct ipv6_devconf *devconf, u32 portid,
525 u32 seq, int event, unsigned int flags,
528 struct nlmsghdr *nlh;
529 struct netconfmsg *ncm;
532 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
537 if (type == NETCONFA_ALL)
540 ncm = nlmsg_data(nlh);
541 ncm->ncm_family = AF_INET6;
543 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
544 goto nla_put_failure;
549 if ((all || type == NETCONFA_FORWARDING) &&
550 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
551 goto nla_put_failure;
552 #ifdef CONFIG_IPV6_MROUTE
553 if ((all || type == NETCONFA_MC_FORWARDING) &&
554 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
555 atomic_read(&devconf->mc_forwarding)) < 0)
556 goto nla_put_failure;
558 if ((all || type == NETCONFA_PROXY_NEIGH) &&
559 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
560 goto nla_put_failure;
562 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
563 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
564 devconf->ignore_routes_with_linkdown) < 0)
565 goto nla_put_failure;
572 nlmsg_cancel(skb, nlh);
576 void inet6_netconf_notify_devconf(struct net *net, int event, int type,
577 int ifindex, struct ipv6_devconf *devconf)
582 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL);
586 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
589 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
590 WARN_ON(err == -EMSGSIZE);
594 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL);
597 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
600 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
601 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
602 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
603 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
604 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
607 static int inet6_netconf_valid_get_req(struct sk_buff *skb,
608 const struct nlmsghdr *nlh,
610 struct netlink_ext_ack *extack)
614 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) {
615 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf get request");
619 if (!netlink_strict_get_check(skb))
620 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg),
622 devconf_ipv6_policy, extack);
624 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg),
626 devconf_ipv6_policy, extack);
630 for (i = 0; i <= NETCONFA_MAX; i++) {
635 case NETCONFA_IFINDEX:
638 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request");
646 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
647 struct nlmsghdr *nlh,
648 struct netlink_ext_ack *extack)
650 struct net *net = sock_net(in_skb->sk);
651 struct nlattr *tb[NETCONFA_MAX+1];
652 struct inet6_dev *in6_dev = NULL;
653 struct net_device *dev = NULL;
655 struct ipv6_devconf *devconf;
659 err = inet6_netconf_valid_get_req(in_skb, nlh, tb, extack);
663 if (!tb[NETCONFA_IFINDEX])
667 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
669 case NETCONFA_IFINDEX_ALL:
670 devconf = net->ipv6.devconf_all;
672 case NETCONFA_IFINDEX_DEFAULT:
673 devconf = net->ipv6.devconf_dflt;
676 dev = dev_get_by_index(net, ifindex);
679 in6_dev = in6_dev_get(dev);
682 devconf = &in6_dev->cnf;
687 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL);
691 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
692 NETLINK_CB(in_skb).portid,
693 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
696 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
697 WARN_ON(err == -EMSGSIZE);
701 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
704 in6_dev_put(in6_dev);
709 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
710 struct netlink_callback *cb)
712 const struct nlmsghdr *nlh = cb->nlh;
713 struct net *net = sock_net(skb->sk);
716 struct net_device *dev;
717 struct inet6_dev *idev;
718 struct hlist_head *head;
720 if (cb->strict_check) {
721 struct netlink_ext_ack *extack = cb->extack;
722 struct netconfmsg *ncm;
724 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) {
725 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request");
729 if (nlmsg_attrlen(nlh, sizeof(*ncm))) {
730 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request");
736 s_idx = idx = cb->args[1];
738 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
740 head = &net->dev_index_head[h];
742 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
744 hlist_for_each_entry_rcu(dev, head, index_hlist) {
747 idev = __in6_dev_get(dev);
751 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
753 NETLINK_CB(cb->skb).portid,
761 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
767 if (h == NETDEV_HASHENTRIES) {
768 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
769 net->ipv6.devconf_all,
770 NETLINK_CB(cb->skb).portid,
772 RTM_NEWNETCONF, NLM_F_MULTI,
778 if (h == NETDEV_HASHENTRIES + 1) {
779 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
780 net->ipv6.devconf_dflt,
781 NETLINK_CB(cb->skb).portid,
783 RTM_NEWNETCONF, NLM_F_MULTI,
797 static void dev_forward_change(struct inet6_dev *idev)
799 struct net_device *dev;
800 struct inet6_ifaddr *ifa;
801 LIST_HEAD(tmp_addr_list);
806 if (idev->cnf.forwarding)
807 dev_disable_lro(dev);
808 if (dev->flags & IFF_MULTICAST) {
809 if (idev->cnf.forwarding) {
810 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
811 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
812 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
814 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
815 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
816 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
820 read_lock_bh(&idev->lock);
821 list_for_each_entry(ifa, &idev->addr_list, if_list) {
822 if (ifa->flags&IFA_F_TENTATIVE)
824 list_add_tail(&ifa->if_list_aux, &tmp_addr_list);
826 read_unlock_bh(&idev->lock);
828 while (!list_empty(&tmp_addr_list)) {
829 ifa = list_first_entry(&tmp_addr_list,
830 struct inet6_ifaddr, if_list_aux);
831 list_del(&ifa->if_list_aux);
832 if (idev->cnf.forwarding)
833 addrconf_join_anycast(ifa);
835 addrconf_leave_anycast(ifa);
838 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
840 dev->ifindex, &idev->cnf);
844 static void addrconf_forward_change(struct net *net, __s32 newf)
846 struct net_device *dev;
847 struct inet6_dev *idev;
849 for_each_netdev(net, dev) {
850 idev = __in6_dev_get(dev);
852 int changed = (!idev->cnf.forwarding) ^ (!newf);
853 idev->cnf.forwarding = newf;
855 dev_forward_change(idev);
860 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
866 return restart_syscall();
868 net = (struct net *)table->extra2;
872 if (p == &net->ipv6.devconf_dflt->forwarding) {
873 if ((!newf) ^ (!old))
874 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
876 NETCONFA_IFINDEX_DEFAULT,
877 net->ipv6.devconf_dflt);
882 if (p == &net->ipv6.devconf_all->forwarding) {
883 int old_dflt = net->ipv6.devconf_dflt->forwarding;
885 net->ipv6.devconf_dflt->forwarding = newf;
886 if ((!newf) ^ (!old_dflt))
887 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
889 NETCONFA_IFINDEX_DEFAULT,
890 net->ipv6.devconf_dflt);
892 addrconf_forward_change(net, newf);
893 if ((!newf) ^ (!old))
894 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
896 NETCONFA_IFINDEX_ALL,
897 net->ipv6.devconf_all);
898 } else if ((!newf) ^ (!old))
899 dev_forward_change((struct inet6_dev *)table->extra1);
903 rt6_purge_dflt_routers(net);
907 static void addrconf_linkdown_change(struct net *net, __s32 newf)
909 struct net_device *dev;
910 struct inet6_dev *idev;
912 for_each_netdev(net, dev) {
913 idev = __in6_dev_get(dev);
915 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
917 idev->cnf.ignore_routes_with_linkdown = newf;
919 inet6_netconf_notify_devconf(dev_net(dev),
921 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
928 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
934 return restart_syscall();
936 net = (struct net *)table->extra2;
940 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
941 if ((!newf) ^ (!old))
942 inet6_netconf_notify_devconf(net,
944 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
945 NETCONFA_IFINDEX_DEFAULT,
946 net->ipv6.devconf_dflt);
951 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
952 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
953 addrconf_linkdown_change(net, newf);
954 if ((!newf) ^ (!old))
955 inet6_netconf_notify_devconf(net,
957 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
958 NETCONFA_IFINDEX_ALL,
959 net->ipv6.devconf_all);
968 /* Nobody refers to this ifaddr, destroy it */
969 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
971 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
973 #ifdef NET_REFCNT_DEBUG
974 pr_debug("%s\n", __func__);
977 in6_dev_put(ifp->idev);
979 if (cancel_delayed_work(&ifp->dad_work))
980 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
983 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
984 pr_warn("Freeing alive inet6 address %p\n", ifp);
992 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
995 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
998 * Each device address list is sorted in order of scope -
999 * global before linklocal.
1001 list_for_each(p, &idev->addr_list) {
1002 struct inet6_ifaddr *ifa
1003 = list_entry(p, struct inet6_ifaddr, if_list);
1004 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
1008 list_add_tail_rcu(&ifp->if_list, p);
1011 static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr)
1013 u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net);
1015 return hash_32(val, IN6_ADDR_HSIZE_SHIFT);
1018 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1019 struct net_device *dev, unsigned int hash)
1021 struct inet6_ifaddr *ifp;
1023 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1024 if (!net_eq(dev_net(ifp->idev->dev), net))
1026 if (ipv6_addr_equal(&ifp->addr, addr)) {
1027 if (!dev || ifp->idev->dev == dev)
1034 static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa)
1036 unsigned int hash = inet6_addr_hash(dev_net(dev), &ifa->addr);
1039 spin_lock(&addrconf_hash_lock);
1041 /* Ignore adding duplicate addresses on an interface */
1042 if (ipv6_chk_same_addr(dev_net(dev), &ifa->addr, dev, hash)) {
1043 netdev_dbg(dev, "ipv6_add_addr: already assigned\n");
1046 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
1049 spin_unlock(&addrconf_hash_lock);
1054 /* On success it returns ifp with increased reference count */
1056 static struct inet6_ifaddr *
1057 ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg,
1058 bool can_block, struct netlink_ext_ack *extack)
1060 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC;
1061 int addr_type = ipv6_addr_type(cfg->pfx);
1062 struct net *net = dev_net(idev->dev);
1063 struct inet6_ifaddr *ifa = NULL;
1064 struct fib6_info *f6i = NULL;
1067 if (addr_type == IPV6_ADDR_ANY ||
1068 (addr_type & IPV6_ADDR_MULTICAST &&
1069 !(cfg->ifa_flags & IFA_F_MCAUTOJOIN)) ||
1070 (!(idev->dev->flags & IFF_LOOPBACK) &&
1071 !netif_is_l3_master(idev->dev) &&
1072 addr_type & IPV6_ADDR_LOOPBACK))
1073 return ERR_PTR(-EADDRNOTAVAIL);
1076 err = -ENODEV; /*XXX*/
1080 if (idev->cnf.disable_ipv6) {
1085 /* validator notifier needs to be blocking;
1086 * do not call in atomic context
1089 struct in6_validator_info i6vi = {
1090 .i6vi_addr = *cfg->pfx,
1095 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi);
1096 err = notifier_to_errno(err);
1101 ifa = kzalloc(sizeof(*ifa), gfp_flags | __GFP_ACCOUNT);
1107 f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags);
1114 neigh_parms_data_state_setall(idev->nd_parms);
1116 ifa->addr = *cfg->pfx;
1118 ifa->peer_addr = *cfg->peer_pfx;
1120 spin_lock_init(&ifa->lock);
1121 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
1122 INIT_HLIST_NODE(&ifa->addr_lst);
1123 ifa->scope = cfg->scope;
1124 ifa->prefix_len = cfg->plen;
1125 ifa->rt_priority = cfg->rt_priority;
1126 ifa->flags = cfg->ifa_flags;
1127 /* No need to add the TENTATIVE flag for addresses with NODAD */
1128 if (!(cfg->ifa_flags & IFA_F_NODAD))
1129 ifa->flags |= IFA_F_TENTATIVE;
1130 ifa->valid_lft = cfg->valid_lft;
1131 ifa->prefered_lft = cfg->preferred_lft;
1132 ifa->cstamp = ifa->tstamp = jiffies;
1133 ifa->tokenized = false;
1141 refcount_set(&ifa->refcnt, 1);
1145 err = ipv6_add_addr_hash(idev->dev, ifa);
1147 rcu_read_unlock_bh();
1151 write_lock(&idev->lock);
1153 /* Add to inet6_dev unicast addr list. */
1154 ipv6_link_dev_addr(idev, ifa);
1156 if (ifa->flags&IFA_F_TEMPORARY) {
1157 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1162 write_unlock(&idev->lock);
1164 rcu_read_unlock_bh();
1166 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1168 if (unlikely(err < 0)) {
1169 fib6_info_release(f6i);
1173 in6_dev_put(ifa->idev);
1182 enum cleanup_prefix_rt_t {
1183 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1184 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1185 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1189 * Check, whether the prefix for ifp would still need a prefix route
1190 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1193 * 1) we don't purge prefix if address was not permanent.
1194 * prefix is managed by its own lifetime.
1195 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1196 * 3) if there are no addresses, delete prefix.
1197 * 4) if there are still other permanent address(es),
1198 * corresponding prefix is still permanent.
1199 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1200 * don't purge the prefix, assume user space is managing it.
1201 * 6) otherwise, update prefix lifetime to the
1202 * longest valid lifetime among the corresponding
1203 * addresses on the device.
1204 * Note: subsequent RA will update lifetime.
1206 static enum cleanup_prefix_rt_t
1207 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1209 struct inet6_ifaddr *ifa;
1210 struct inet6_dev *idev = ifp->idev;
1211 unsigned long lifetime;
1212 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1216 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1219 if (ifa->prefix_len != ifp->prefix_len ||
1220 !ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1223 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1224 return CLEANUP_PREFIX_RT_NOP;
1226 action = CLEANUP_PREFIX_RT_EXPIRE;
1228 spin_lock(&ifa->lock);
1230 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1232 * Note: Because this address is
1233 * not permanent, lifetime <
1234 * LONG_MAX / HZ here.
1236 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1237 *expires = ifa->tstamp + lifetime * HZ;
1238 spin_unlock(&ifa->lock);
1245 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires,
1246 bool del_rt, bool del_peer)
1248 struct fib6_info *f6i;
1250 f6i = addrconf_get_prefix_route(del_peer ? &ifp->peer_addr : &ifp->addr,
1252 ifp->idev->dev, 0, RTF_DEFAULT, true);
1255 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false);
1257 if (!(f6i->fib6_flags & RTF_EXPIRES))
1258 fib6_set_expires(f6i, expires);
1259 fib6_info_release(f6i);
1265 /* This function wants to get referenced ifp and releases it before return */
1267 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1270 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1271 unsigned long expires;
1275 spin_lock_bh(&ifp->lock);
1277 ifp->state = INET6_IFADDR_STATE_DEAD;
1278 spin_unlock_bh(&ifp->lock);
1280 if (state == INET6_IFADDR_STATE_DEAD)
1283 spin_lock_bh(&addrconf_hash_lock);
1284 hlist_del_init_rcu(&ifp->addr_lst);
1285 spin_unlock_bh(&addrconf_hash_lock);
1287 write_lock_bh(&ifp->idev->lock);
1289 if (ifp->flags&IFA_F_TEMPORARY) {
1290 list_del(&ifp->tmp_list);
1292 in6_ifa_put(ifp->ifpub);
1298 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1299 action = check_cleanup_prefix_route(ifp, &expires);
1301 list_del_rcu(&ifp->if_list);
1304 write_unlock_bh(&ifp->idev->lock);
1306 addrconf_del_dad_work(ifp);
1308 ipv6_ifa_notify(RTM_DELADDR, ifp);
1310 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1312 if (action != CLEANUP_PREFIX_RT_NOP) {
1313 cleanup_prefix_route(ifp, expires,
1314 action == CLEANUP_PREFIX_RT_DEL, false);
1317 /* clean up prefsrc entries */
1318 rt6_remove_prefsrc(ifp);
1323 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, bool block)
1325 struct inet6_dev *idev = ifp->idev;
1326 unsigned long tmp_tstamp, age;
1327 unsigned long regen_advance;
1328 unsigned long now = jiffies;
1329 s32 cnf_temp_preferred_lft;
1330 struct inet6_ifaddr *ift;
1331 struct ifa6_config cfg;
1332 long max_desync_factor;
1333 struct in6_addr addr;
1336 write_lock_bh(&idev->lock);
1340 if (idev->cnf.use_tempaddr <= 0) {
1341 write_unlock_bh(&idev->lock);
1342 pr_info("%s: use_tempaddr is disabled\n", __func__);
1347 spin_lock_bh(&ifp->lock);
1348 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1349 idev->cnf.use_tempaddr = -1; /*XXX*/
1350 spin_unlock_bh(&ifp->lock);
1351 write_unlock_bh(&idev->lock);
1352 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1359 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1360 ipv6_gen_rnd_iid(&addr);
1362 age = (now - ifp->tstamp) / HZ;
1364 regen_advance = idev->cnf.regen_max_retry *
1365 idev->cnf.dad_transmits *
1366 max(NEIGH_VAR(idev->nd_parms, RETRANS_TIME), HZ/100) / HZ;
1368 /* recalculate max_desync_factor each time and update
1369 * idev->desync_factor if it's larger
1371 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
1372 max_desync_factor = min_t(__u32,
1373 idev->cnf.max_desync_factor,
1374 cnf_temp_preferred_lft - regen_advance);
1376 if (unlikely(idev->desync_factor > max_desync_factor)) {
1377 if (max_desync_factor > 0) {
1378 get_random_bytes(&idev->desync_factor,
1379 sizeof(idev->desync_factor));
1380 idev->desync_factor %= max_desync_factor;
1382 idev->desync_factor = 0;
1386 memset(&cfg, 0, sizeof(cfg));
1387 cfg.valid_lft = min_t(__u32, ifp->valid_lft,
1388 idev->cnf.temp_valid_lft + age);
1389 cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor;
1390 cfg.preferred_lft = min_t(__u32, ifp->prefered_lft, cfg.preferred_lft);
1392 cfg.plen = ifp->prefix_len;
1393 tmp_tstamp = ifp->tstamp;
1394 spin_unlock_bh(&ifp->lock);
1396 write_unlock_bh(&idev->lock);
1398 /* A temporary address is created only if this calculated Preferred
1399 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1400 * an implementation must not create a temporary address with a zero
1401 * Preferred Lifetime.
1402 * Use age calculation as in addrconf_verify to avoid unnecessary
1403 * temporary addresses being generated.
1405 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1406 if (cfg.preferred_lft <= regen_advance + age) {
1413 cfg.ifa_flags = IFA_F_TEMPORARY;
1414 /* set in addrconf_prefix_rcv() */
1415 if (ifp->flags & IFA_F_OPTIMISTIC)
1416 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
1419 cfg.scope = ipv6_addr_scope(cfg.pfx);
1421 ift = ipv6_add_addr(idev, &cfg, block, NULL);
1425 pr_info("%s: retry temporary address regeneration\n", __func__);
1426 write_lock_bh(&idev->lock);
1430 spin_lock_bh(&ift->lock);
1433 ift->tstamp = tmp_tstamp;
1434 spin_unlock_bh(&ift->lock);
1436 addrconf_dad_start(ift);
1444 * Choose an appropriate source address (RFC3484)
1447 IPV6_SADDR_RULE_INIT = 0,
1448 IPV6_SADDR_RULE_LOCAL,
1449 IPV6_SADDR_RULE_SCOPE,
1450 IPV6_SADDR_RULE_PREFERRED,
1451 #ifdef CONFIG_IPV6_MIP6
1452 IPV6_SADDR_RULE_HOA,
1454 IPV6_SADDR_RULE_OIF,
1455 IPV6_SADDR_RULE_LABEL,
1456 IPV6_SADDR_RULE_PRIVACY,
1457 IPV6_SADDR_RULE_ORCHID,
1458 IPV6_SADDR_RULE_PREFIX,
1459 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1460 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1465 struct ipv6_saddr_score {
1468 struct inet6_ifaddr *ifa;
1469 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1474 struct ipv6_saddr_dst {
1475 const struct in6_addr *addr;
1482 static inline int ipv6_saddr_preferred(int type)
1484 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1489 static bool ipv6_use_optimistic_addr(struct net *net,
1490 struct inet6_dev *idev)
1492 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1495 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1497 if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic)
1506 static bool ipv6_allow_optimistic_dad(struct net *net,
1507 struct inet6_dev *idev)
1509 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1512 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1521 static int ipv6_get_saddr_eval(struct net *net,
1522 struct ipv6_saddr_score *score,
1523 struct ipv6_saddr_dst *dst,
1528 if (i <= score->rule) {
1530 case IPV6_SADDR_RULE_SCOPE:
1531 ret = score->scopedist;
1533 case IPV6_SADDR_RULE_PREFIX:
1534 ret = score->matchlen;
1537 ret = !!test_bit(i, score->scorebits);
1543 case IPV6_SADDR_RULE_INIT:
1544 /* Rule 0: remember if hiscore is not ready yet */
1547 case IPV6_SADDR_RULE_LOCAL:
1548 /* Rule 1: Prefer same address */
1549 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1551 case IPV6_SADDR_RULE_SCOPE:
1552 /* Rule 2: Prefer appropriate scope
1557 * ---+--+-+---> scope
1559 * | d is scope of the destination.
1561 * | \ <- smaller scope is better if
1562 * B-15 | \ if scope is enough for destination.
1563 * | ret = B - scope (-1 <= scope >= d <= 15).
1565 * |/ <- greater is better
1566 * -C / if scope is not enough for destination.
1567 * /| ret = scope - C (-1 <= d < scope <= 15).
1569 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1570 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1571 * Assume B = 0 and we get C > 29.
1573 ret = __ipv6_addr_src_scope(score->addr_type);
1574 if (ret >= dst->scope)
1577 ret -= 128; /* 30 is enough */
1578 score->scopedist = ret;
1580 case IPV6_SADDR_RULE_PREFERRED:
1582 /* Rule 3: Avoid deprecated and optimistic addresses */
1583 u8 avoid = IFA_F_DEPRECATED;
1585 if (!ipv6_use_optimistic_addr(net, score->ifa->idev))
1586 avoid |= IFA_F_OPTIMISTIC;
1587 ret = ipv6_saddr_preferred(score->addr_type) ||
1588 !(score->ifa->flags & avoid);
1591 #ifdef CONFIG_IPV6_MIP6
1592 case IPV6_SADDR_RULE_HOA:
1594 /* Rule 4: Prefer home address */
1595 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1596 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1600 case IPV6_SADDR_RULE_OIF:
1601 /* Rule 5: Prefer outgoing interface */
1602 ret = (!dst->ifindex ||
1603 dst->ifindex == score->ifa->idev->dev->ifindex);
1605 case IPV6_SADDR_RULE_LABEL:
1606 /* Rule 6: Prefer matching label */
1607 ret = ipv6_addr_label(net,
1608 &score->ifa->addr, score->addr_type,
1609 score->ifa->idev->dev->ifindex) == dst->label;
1611 case IPV6_SADDR_RULE_PRIVACY:
1613 /* Rule 7: Prefer public address
1614 * Note: prefer temporary address if use_tempaddr >= 2
1616 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1617 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1618 score->ifa->idev->cnf.use_tempaddr >= 2;
1619 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1622 case IPV6_SADDR_RULE_ORCHID:
1623 /* Rule 8-: Prefer ORCHID vs ORCHID or
1624 * non-ORCHID vs non-ORCHID
1626 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1627 ipv6_addr_orchid(dst->addr));
1629 case IPV6_SADDR_RULE_PREFIX:
1630 /* Rule 8: Use longest matching prefix */
1631 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1632 if (ret > score->ifa->prefix_len)
1633 ret = score->ifa->prefix_len;
1634 score->matchlen = ret;
1636 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1637 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1638 /* Optimistic addresses still have lower precedence than other
1639 * preferred addresses.
1641 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1649 __set_bit(i, score->scorebits);
1655 static int __ipv6_dev_get_saddr(struct net *net,
1656 struct ipv6_saddr_dst *dst,
1657 struct inet6_dev *idev,
1658 struct ipv6_saddr_score *scores,
1661 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1663 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) {
1667 * - Tentative Address (RFC2462 section 5.4)
1668 * - A tentative address is not considered
1669 * "assigned to an interface" in the traditional
1670 * sense, unless it is also flagged as optimistic.
1671 * - Candidate Source Address (section 4)
1672 * - In any case, anycast addresses, multicast
1673 * addresses, and the unspecified address MUST
1674 * NOT be included in a candidate set.
1676 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1677 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1680 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1682 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1683 score->addr_type & IPV6_ADDR_MULTICAST)) {
1684 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1690 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1692 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1693 int minihiscore, miniscore;
1695 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1696 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1698 if (minihiscore > miniscore) {
1699 if (i == IPV6_SADDR_RULE_SCOPE &&
1700 score->scopedist > 0) {
1703 * each remaining entry
1704 * has too small (not enough)
1705 * scope, because ifa entries
1706 * are sorted by their scope
1712 } else if (minihiscore < miniscore) {
1713 swap(hiscore, score);
1714 hiscore_idx = 1 - hiscore_idx;
1716 /* restore our iterator */
1717 score->ifa = hiscore->ifa;
1727 static int ipv6_get_saddr_master(struct net *net,
1728 const struct net_device *dst_dev,
1729 const struct net_device *master,
1730 struct ipv6_saddr_dst *dst,
1731 struct ipv6_saddr_score *scores,
1734 struct inet6_dev *idev;
1736 idev = __in6_dev_get(dst_dev);
1738 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1739 scores, hiscore_idx);
1741 idev = __in6_dev_get(master);
1743 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1744 scores, hiscore_idx);
1749 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1750 const struct in6_addr *daddr, unsigned int prefs,
1751 struct in6_addr *saddr)
1753 struct ipv6_saddr_score scores[2], *hiscore;
1754 struct ipv6_saddr_dst dst;
1755 struct inet6_dev *idev;
1756 struct net_device *dev;
1758 bool use_oif_addr = false;
1759 int hiscore_idx = 0;
1762 dst_type = __ipv6_addr_type(daddr);
1764 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1765 dst.scope = __ipv6_addr_src_scope(dst_type);
1766 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1769 scores[hiscore_idx].rule = -1;
1770 scores[hiscore_idx].ifa = NULL;
1774 /* Candidate Source Address (section 4)
1775 * - multicast and link-local destination address,
1776 * the set of candidate source address MUST only
1777 * include addresses assigned to interfaces
1778 * belonging to the same link as the outgoing
1780 * (- For site-local destination addresses, the
1781 * set of candidate source addresses MUST only
1782 * include addresses assigned to interfaces
1783 * belonging to the same site as the outgoing
1785 * - "It is RECOMMENDED that the candidate source addresses
1786 * be the set of unicast addresses assigned to the
1787 * interface that will be used to send to the destination
1788 * (the 'outgoing' interface)." (RFC 6724)
1791 idev = __in6_dev_get(dst_dev);
1792 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1793 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1794 (idev && idev->cnf.use_oif_addrs_only)) {
1795 use_oif_addr = true;
1801 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1803 const struct net_device *master;
1806 /* if dst_dev exists and is enslaved to an L3 device, then
1807 * prefer addresses from dst_dev and then the master over
1808 * any other enslaved devices in the L3 domain.
1810 master = l3mdev_master_dev_rcu(dst_dev);
1812 master_idx = master->ifindex;
1814 hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1816 scores, hiscore_idx);
1818 if (scores[hiscore_idx].ifa)
1822 for_each_netdev_rcu(net, dev) {
1823 /* only consider addresses on devices in the
1826 if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1828 idev = __in6_dev_get(dev);
1831 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1836 hiscore = &scores[hiscore_idx];
1838 ret = -EADDRNOTAVAIL;
1840 *saddr = hiscore->ifa->addr;
1845 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1847 static int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1850 struct inet6_ifaddr *ifp;
1851 int err = -EADDRNOTAVAIL;
1853 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1854 if (ifp->scope > IFA_LINK)
1856 if (ifp->scope == IFA_LINK &&
1857 !(ifp->flags & banned_flags)) {
1866 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1869 struct inet6_dev *idev;
1870 int err = -EADDRNOTAVAIL;
1873 idev = __in6_dev_get(dev);
1875 read_lock_bh(&idev->lock);
1876 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1877 read_unlock_bh(&idev->lock);
1883 static int ipv6_count_addresses(const struct inet6_dev *idev)
1885 const struct inet6_ifaddr *ifp;
1889 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list)
1895 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1896 const struct net_device *dev, int strict)
1898 return ipv6_chk_addr_and_flags(net, addr, dev, !dev,
1899 strict, IFA_F_TENTATIVE);
1901 EXPORT_SYMBOL(ipv6_chk_addr);
1903 /* device argument is used to find the L3 domain of interest. If
1904 * skip_dev_check is set, then the ifp device is not checked against
1905 * the passed in dev argument. So the 2 cases for addresses checks are:
1906 * 1. does the address exist in the L3 domain that dev is part of
1907 * (skip_dev_check = true), or
1909 * 2. does the address exist on the specific device
1910 * (skip_dev_check = false)
1912 static struct net_device *
1913 __ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1914 const struct net_device *dev, bool skip_dev_check,
1915 int strict, u32 banned_flags)
1917 unsigned int hash = inet6_addr_hash(net, addr);
1918 struct net_device *l3mdev, *ndev;
1919 struct inet6_ifaddr *ifp;
1924 l3mdev = l3mdev_master_dev_rcu(dev);
1928 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1929 ndev = ifp->idev->dev;
1930 if (!net_eq(dev_net(ndev), net))
1933 if (l3mdev_master_dev_rcu(ndev) != l3mdev)
1936 /* Decouple optimistic from tentative for evaluation here.
1937 * Ban optimistic addresses explicitly, when required.
1939 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1940 ? (ifp->flags&~IFA_F_TENTATIVE)
1942 if (ipv6_addr_equal(&ifp->addr, addr) &&
1943 !(ifp_flags&banned_flags) &&
1944 (!dev || ndev == dev ||
1945 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1955 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1956 const struct net_device *dev, bool skip_dev_check,
1957 int strict, u32 banned_flags)
1959 return __ipv6_chk_addr_and_flags(net, addr, dev, skip_dev_check,
1960 strict, banned_flags) ? 1 : 0;
1962 EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1965 /* Compares an address/prefix_len with addresses on device @dev.
1966 * If one is found it returns true.
1968 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1969 const unsigned int prefix_len, struct net_device *dev)
1971 const struct inet6_ifaddr *ifa;
1972 const struct inet6_dev *idev;
1976 idev = __in6_dev_get(dev);
1978 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
1979 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1988 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1990 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1992 const struct inet6_ifaddr *ifa;
1993 const struct inet6_dev *idev;
1998 idev = __in6_dev_get(dev);
2000 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
2001 onlink = ipv6_prefix_equal(addr, &ifa->addr,
2010 EXPORT_SYMBOL(ipv6_chk_prefix);
2013 * ipv6_dev_find - find the first device with a given source address.
2014 * @net: the net namespace
2015 * @addr: the source address
2016 * @dev: used to find the L3 domain of interest
2018 * The caller should be protected by RCU, or RTNL.
2020 struct net_device *ipv6_dev_find(struct net *net, const struct in6_addr *addr,
2021 struct net_device *dev)
2023 return __ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1,
2026 EXPORT_SYMBOL(ipv6_dev_find);
2028 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
2029 struct net_device *dev, int strict)
2031 unsigned int hash = inet6_addr_hash(net, addr);
2032 struct inet6_ifaddr *ifp, *result = NULL;
2035 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
2036 if (!net_eq(dev_net(ifp->idev->dev), net))
2038 if (ipv6_addr_equal(&ifp->addr, addr)) {
2039 if (!dev || ifp->idev->dev == dev ||
2040 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
2052 /* Gets referenced address, destroys ifaddr */
2054 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
2057 ifp->flags |= IFA_F_DADFAILED;
2059 if (ifp->flags&IFA_F_TEMPORARY) {
2060 struct inet6_ifaddr *ifpub;
2061 spin_lock_bh(&ifp->lock);
2064 in6_ifa_hold(ifpub);
2065 spin_unlock_bh(&ifp->lock);
2066 ipv6_create_tempaddr(ifpub, true);
2069 spin_unlock_bh(&ifp->lock);
2072 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) {
2073 spin_lock_bh(&ifp->lock);
2074 addrconf_del_dad_work(ifp);
2075 ifp->flags |= IFA_F_TENTATIVE;
2077 ifp->flags &= ~IFA_F_OPTIMISTIC;
2078 spin_unlock_bh(&ifp->lock);
2080 ipv6_ifa_notify(0, ifp);
2087 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
2091 spin_lock_bh(&ifp->lock);
2092 if (ifp->state == INET6_IFADDR_STATE_DAD) {
2093 ifp->state = INET6_IFADDR_STATE_POSTDAD;
2096 spin_unlock_bh(&ifp->lock);
2101 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp)
2103 struct inet6_dev *idev = ifp->idev;
2104 struct net *net = dev_net(ifp->idev->dev);
2106 if (addrconf_dad_end(ifp)) {
2111 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n",
2112 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source);
2114 spin_lock_bh(&ifp->lock);
2116 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
2117 struct in6_addr new_addr;
2118 struct inet6_ifaddr *ifp2;
2119 int retries = ifp->stable_privacy_retry + 1;
2120 struct ifa6_config cfg = {
2122 .plen = ifp->prefix_len,
2123 .ifa_flags = ifp->flags,
2124 .valid_lft = ifp->valid_lft,
2125 .preferred_lft = ifp->prefered_lft,
2126 .scope = ifp->scope,
2129 if (retries > net->ipv6.sysctl.idgen_retries) {
2130 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
2131 ifp->idev->dev->name);
2135 new_addr = ifp->addr;
2136 if (ipv6_generate_stable_address(&new_addr, retries,
2140 spin_unlock_bh(&ifp->lock);
2142 if (idev->cnf.max_addresses &&
2143 ipv6_count_addresses(idev) >=
2144 idev->cnf.max_addresses)
2147 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
2148 ifp->idev->dev->name);
2150 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL);
2154 spin_lock_bh(&ifp2->lock);
2155 ifp2->stable_privacy_retry = retries;
2156 ifp2->state = INET6_IFADDR_STATE_PREDAD;
2157 spin_unlock_bh(&ifp2->lock);
2159 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
2162 spin_lock_bh(&ifp->lock);
2166 /* transition from _POSTDAD to _ERRDAD */
2167 ifp->state = INET6_IFADDR_STATE_ERRDAD;
2168 spin_unlock_bh(&ifp->lock);
2170 addrconf_mod_dad_work(ifp, 0);
2174 /* Join to solicited addr multicast group.
2175 * caller must hold RTNL */
2176 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
2178 struct in6_addr maddr;
2180 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2183 addrconf_addr_solict_mult(addr, &maddr);
2184 ipv6_dev_mc_inc(dev, &maddr);
2187 /* caller must hold RTNL */
2188 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
2190 struct in6_addr maddr;
2192 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2195 addrconf_addr_solict_mult(addr, &maddr);
2196 __ipv6_dev_mc_dec(idev, &maddr);
2199 /* caller must hold RTNL */
2200 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
2202 struct in6_addr addr;
2204 if (ifp->prefix_len >= 127) /* RFC 6164 */
2206 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2207 if (ipv6_addr_any(&addr))
2209 __ipv6_dev_ac_inc(ifp->idev, &addr);
2212 /* caller must hold RTNL */
2213 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
2215 struct in6_addr addr;
2217 if (ifp->prefix_len >= 127) /* RFC 6164 */
2219 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2220 if (ipv6_addr_any(&addr))
2222 __ipv6_dev_ac_dec(ifp->idev, &addr);
2225 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev)
2227 switch (dev->addr_len) {
2229 memcpy(eui, dev->dev_addr, 3);
2232 memcpy(eui + 5, dev->dev_addr + 3, 3);
2234 case EUI64_ADDR_LEN:
2235 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2245 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2247 union fwnet_hwaddr *ha;
2249 if (dev->addr_len != FWNET_ALEN)
2252 ha = (union fwnet_hwaddr *)dev->dev_addr;
2254 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2259 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2261 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2262 if (dev->addr_len != ARCNET_ALEN)
2265 eui[7] = *(u8 *)dev->dev_addr;
2269 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2271 if (dev->addr_len != INFINIBAND_ALEN)
2273 memcpy(eui, dev->dev_addr + 12, 8);
2278 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
2282 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2283 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2284 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2285 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2286 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2287 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2291 memcpy(eui + 4, &addr, 4);
2295 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2297 if (dev->priv_flags & IFF_ISATAP)
2298 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2302 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2304 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2307 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2309 memcpy(eui, dev->perm_addr, 3);
2310 memcpy(eui + 5, dev->perm_addr + 3, 3);
2317 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2319 switch (dev->type) {
2322 return addrconf_ifid_eui48(eui, dev);
2324 return addrconf_ifid_arcnet(eui, dev);
2325 case ARPHRD_INFINIBAND:
2326 return addrconf_ifid_infiniband(eui, dev);
2328 return addrconf_ifid_sit(eui, dev);
2331 return addrconf_ifid_gre(eui, dev);
2332 case ARPHRD_6LOWPAN:
2333 return addrconf_ifid_6lowpan(eui, dev);
2334 case ARPHRD_IEEE1394:
2335 return addrconf_ifid_ieee1394(eui, dev);
2336 case ARPHRD_TUNNEL6:
2339 return addrconf_ifid_ip6tnl(eui, dev);
2344 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2347 struct inet6_ifaddr *ifp;
2349 read_lock_bh(&idev->lock);
2350 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2351 if (ifp->scope > IFA_LINK)
2353 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2354 memcpy(eui, ifp->addr.s6_addr+8, 8);
2359 read_unlock_bh(&idev->lock);
2363 /* Generation of a randomized Interface Identifier
2364 * draft-ietf-6man-rfc4941bis, Section 3.3.1
2367 static void ipv6_gen_rnd_iid(struct in6_addr *addr)
2370 get_random_bytes(&addr->s6_addr[8], 8);
2372 /* <draft-ietf-6man-rfc4941bis-08.txt>, Section 3.3.1:
2373 * check if generated address is not inappropriate:
2375 * - Reserved IPv6 Interface Identifiers
2376 * - XXX: already assigned to an address on the device
2379 /* Subnet-router anycast: 0000:0000:0000:0000 */
2380 if (!(addr->s6_addr32[2] | addr->s6_addr32[3]))
2383 /* IANA Ethernet block: 0200:5EFF:FE00:0000-0200:5EFF:FE00:5212
2384 * Proxy Mobile IPv6: 0200:5EFF:FE00:5213
2385 * IANA Ethernet block: 0200:5EFF:FE00:5214-0200:5EFF:FEFF:FFFF
2387 if (ntohl(addr->s6_addr32[2]) == 0x02005eff &&
2388 (ntohl(addr->s6_addr32[3]) & 0Xff000000) == 0xfe000000)
2391 /* Reserved subnet anycast addresses */
2392 if (ntohl(addr->s6_addr32[2]) == 0xfdffffff &&
2393 ntohl(addr->s6_addr32[3]) >= 0Xffffff80)
2402 addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric,
2403 struct net_device *dev, unsigned long expires,
2404 u32 flags, gfp_t gfp_flags)
2406 struct fib6_config cfg = {
2407 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
2408 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF,
2409 .fc_ifindex = dev->ifindex,
2410 .fc_expires = expires,
2412 .fc_flags = RTF_UP | flags,
2413 .fc_nlinfo.nl_net = dev_net(dev),
2414 .fc_protocol = RTPROT_KERNEL,
2415 .fc_type = RTN_UNICAST,
2420 /* Prevent useless cloning on PtP SIT.
2421 This thing is done here expecting that the whole
2422 class of non-broadcast devices need not cloning.
2424 #if IS_ENABLED(CONFIG_IPV6_SIT)
2425 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2426 cfg.fc_flags |= RTF_NONEXTHOP;
2429 ip6_route_add(&cfg, gfp_flags, NULL);
2433 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2435 const struct net_device *dev,
2436 u32 flags, u32 noflags,
2439 struct fib6_node *fn;
2440 struct fib6_info *rt = NULL;
2441 struct fib6_table *table;
2442 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
2444 table = fib6_get_table(dev_net(dev), tb_id);
2449 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true);
2453 for_each_fib6_node_rt_rcu(fn) {
2454 /* prefix routes only use builtin fib6_nh */
2458 if (rt->fib6_nh->fib_nh_dev->ifindex != dev->ifindex)
2460 if (no_gw && rt->fib6_nh->fib_nh_gw_family)
2462 if ((rt->fib6_flags & flags) != flags)
2464 if ((rt->fib6_flags & noflags) != 0)
2466 if (!fib6_info_hold_safe(rt))
2476 /* Create "default" multicast route to the interface */
2478 static void addrconf_add_mroute(struct net_device *dev)
2480 struct fib6_config cfg = {
2481 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2482 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2483 .fc_ifindex = dev->ifindex,
2486 .fc_type = RTN_MULTICAST,
2487 .fc_nlinfo.nl_net = dev_net(dev),
2488 .fc_protocol = RTPROT_KERNEL,
2491 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2493 ip6_route_add(&cfg, GFP_KERNEL, NULL);
2496 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2498 struct inet6_dev *idev;
2502 idev = ipv6_find_idev(dev);
2506 if (idev->cnf.disable_ipv6)
2507 return ERR_PTR(-EACCES);
2509 /* Add default multicast route */
2510 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
2511 addrconf_add_mroute(dev);
2516 static void manage_tempaddrs(struct inet6_dev *idev,
2517 struct inet6_ifaddr *ifp,
2518 __u32 valid_lft, __u32 prefered_lft,
2519 bool create, unsigned long now)
2522 struct inet6_ifaddr *ift;
2524 read_lock_bh(&idev->lock);
2525 /* update all temporary addresses in the list */
2526 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2527 int age, max_valid, max_prefered;
2529 if (ifp != ift->ifpub)
2532 /* RFC 4941 section 3.3:
2533 * If a received option will extend the lifetime of a public
2534 * address, the lifetimes of temporary addresses should
2535 * be extended, subject to the overall constraint that no
2536 * temporary addresses should ever remain "valid" or "preferred"
2537 * for a time longer than (TEMP_VALID_LIFETIME) or
2538 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2540 age = (now - ift->cstamp) / HZ;
2541 max_valid = idev->cnf.temp_valid_lft - age;
2545 max_prefered = idev->cnf.temp_prefered_lft -
2546 idev->desync_factor - age;
2547 if (max_prefered < 0)
2550 if (valid_lft > max_valid)
2551 valid_lft = max_valid;
2553 if (prefered_lft > max_prefered)
2554 prefered_lft = max_prefered;
2556 spin_lock(&ift->lock);
2558 ift->valid_lft = valid_lft;
2559 ift->prefered_lft = prefered_lft;
2561 if (prefered_lft > 0)
2562 ift->flags &= ~IFA_F_DEPRECATED;
2564 spin_unlock(&ift->lock);
2565 if (!(flags&IFA_F_TENTATIVE))
2566 ipv6_ifa_notify(0, ift);
2569 if ((create || list_empty(&idev->tempaddr_list)) &&
2570 idev->cnf.use_tempaddr > 0) {
2571 /* When a new public address is created as described
2572 * in [ADDRCONF], also create a new temporary address.
2573 * Also create a temporary address if it's enabled but
2574 * no temporary address currently exists.
2576 read_unlock_bh(&idev->lock);
2577 ipv6_create_tempaddr(ifp, false);
2579 read_unlock_bh(&idev->lock);
2583 static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2585 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2586 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2589 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2590 const struct prefix_info *pinfo,
2591 struct inet6_dev *in6_dev,
2592 const struct in6_addr *addr, int addr_type,
2593 u32 addr_flags, bool sllao, bool tokenized,
2594 __u32 valid_lft, u32 prefered_lft)
2596 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2597 int create = 0, update_lft = 0;
2599 if (!ifp && valid_lft) {
2600 int max_addresses = in6_dev->cnf.max_addresses;
2601 struct ifa6_config cfg = {
2603 .plen = pinfo->prefix_len,
2604 .ifa_flags = addr_flags,
2605 .valid_lft = valid_lft,
2606 .preferred_lft = prefered_lft,
2607 .scope = addr_type & IPV6_ADDR_SCOPE_MASK,
2610 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2611 if ((net->ipv6.devconf_all->optimistic_dad ||
2612 in6_dev->cnf.optimistic_dad) &&
2613 !net->ipv6.devconf_all->forwarding && sllao)
2614 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
2617 /* Do not allow to create too much of autoconfigured
2618 * addresses; this would be too easy way to crash kernel.
2620 if (!max_addresses ||
2621 ipv6_count_addresses(in6_dev) < max_addresses)
2622 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL);
2624 if (IS_ERR_OR_NULL(ifp))
2628 spin_lock_bh(&ifp->lock);
2629 ifp->flags |= IFA_F_MANAGETEMPADDR;
2630 ifp->cstamp = jiffies;
2631 ifp->tokenized = tokenized;
2632 spin_unlock_bh(&ifp->lock);
2633 addrconf_dad_start(ifp);
2641 /* update lifetime (RFC2462 5.5.3 e) */
2642 spin_lock_bh(&ifp->lock);
2644 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2645 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2648 if (!create && stored_lft) {
2649 const u32 minimum_lft = min_t(u32,
2650 stored_lft, MIN_VALID_LIFETIME);
2651 valid_lft = max(valid_lft, minimum_lft);
2653 /* RFC4862 Section 5.5.3e:
2654 * "Note that the preferred lifetime of the
2655 * corresponding address is always reset to
2656 * the Preferred Lifetime in the received
2657 * Prefix Information option, regardless of
2658 * whether the valid lifetime is also reset or
2661 * So we should always update prefered_lft here.
2667 ifp->valid_lft = valid_lft;
2668 ifp->prefered_lft = prefered_lft;
2671 ifp->flags &= ~IFA_F_DEPRECATED;
2672 spin_unlock_bh(&ifp->lock);
2674 if (!(flags&IFA_F_TENTATIVE))
2675 ipv6_ifa_notify(0, ifp);
2677 spin_unlock_bh(&ifp->lock);
2679 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2688 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
2690 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2692 struct prefix_info *pinfo;
2697 struct inet6_dev *in6_dev;
2698 struct net *net = dev_net(dev);
2700 pinfo = (struct prefix_info *) opt;
2702 if (len < sizeof(struct prefix_info)) {
2703 netdev_dbg(dev, "addrconf: prefix option too short\n");
2708 * Validation checks ([ADDRCONF], page 19)
2711 addr_type = ipv6_addr_type(&pinfo->prefix);
2713 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2716 valid_lft = ntohl(pinfo->valid);
2717 prefered_lft = ntohl(pinfo->prefered);
2719 if (prefered_lft > valid_lft) {
2720 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2724 in6_dev = in6_dev_get(dev);
2727 net_dbg_ratelimited("addrconf: device %s not configured\n",
2733 * Two things going on here:
2734 * 1) Add routes for on-link prefixes
2735 * 2) Configure prefixes with the auto flag set
2738 if (pinfo->onlink) {
2739 struct fib6_info *rt;
2740 unsigned long rt_expires;
2742 /* Avoid arithmetic overflow. Really, we could
2743 * save rt_expires in seconds, likely valid_lft,
2744 * but it would require division in fib gc, that it
2748 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2750 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2752 if (addrconf_finite_timeout(rt_expires))
2755 rt = addrconf_get_prefix_route(&pinfo->prefix,
2758 RTF_ADDRCONF | RTF_PREFIX_RT,
2762 /* Autoconf prefix route */
2763 if (valid_lft == 0) {
2764 ip6_del_rt(net, rt, false);
2766 } else if (addrconf_finite_timeout(rt_expires)) {
2768 fib6_set_expires(rt, jiffies + rt_expires);
2770 fib6_clean_expires(rt);
2772 } else if (valid_lft) {
2773 clock_t expires = 0;
2774 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2775 if (addrconf_finite_timeout(rt_expires)) {
2777 flags |= RTF_EXPIRES;
2778 expires = jiffies_to_clock_t(rt_expires);
2780 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2781 0, dev, expires, flags,
2784 fib6_info_release(rt);
2787 /* Try to figure out our local address for this prefix */
2789 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2790 struct in6_addr addr;
2791 bool tokenized = false, dev_addr_generated = false;
2793 if (pinfo->prefix_len == 64) {
2794 memcpy(&addr, &pinfo->prefix, 8);
2796 if (!ipv6_addr_any(&in6_dev->token)) {
2797 read_lock_bh(&in6_dev->lock);
2798 memcpy(addr.s6_addr + 8,
2799 in6_dev->token.s6_addr + 8, 8);
2800 read_unlock_bh(&in6_dev->lock);
2802 } else if (is_addr_mode_generate_stable(in6_dev) &&
2803 !ipv6_generate_stable_address(&addr, 0,
2805 addr_flags |= IFA_F_STABLE_PRIVACY;
2807 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2808 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2811 dev_addr_generated = true;
2815 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2820 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2823 tokenized, valid_lft,
2828 /* Ignore error case here because previous prefix add addr was
2829 * successful which will be notified.
2831 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2832 addr_type, addr_flags, sllao,
2833 tokenized, valid_lft,
2835 dev_addr_generated);
2837 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2839 in6_dev_put(in6_dev);
2842 static int addrconf_set_sit_dstaddr(struct net *net, struct net_device *dev,
2843 struct in6_ifreq *ireq)
2845 struct ip_tunnel_parm p = { };
2848 if (!(ipv6_addr_type(&ireq->ifr6_addr) & IPV6_ADDR_COMPATv4))
2849 return -EADDRNOTAVAIL;
2851 p.iph.daddr = ireq->ifr6_addr.s6_addr32[3];
2854 p.iph.protocol = IPPROTO_IPV6;
2857 if (!dev->netdev_ops->ndo_tunnel_ctl)
2859 err = dev->netdev_ops->ndo_tunnel_ctl(dev, &p, SIOCADDTUNNEL);
2863 dev = __dev_get_by_name(net, p.name);
2866 return dev_open(dev, NULL);
2870 * Set destination address.
2871 * Special case for SIT interfaces where we create a new "virtual"
2874 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2876 struct net_device *dev;
2877 struct in6_ifreq ireq;
2880 if (!IS_ENABLED(CONFIG_IPV6_SIT))
2882 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2886 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2887 if (dev && dev->type == ARPHRD_SIT)
2888 err = addrconf_set_sit_dstaddr(net, dev, &ireq);
2893 static int ipv6_mc_config(struct sock *sk, bool join,
2894 const struct in6_addr *addr, int ifindex)
2902 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2904 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2911 * Manual configuration of address on an interface
2913 static int inet6_addr_add(struct net *net, int ifindex,
2914 struct ifa6_config *cfg,
2915 struct netlink_ext_ack *extack)
2917 struct inet6_ifaddr *ifp;
2918 struct inet6_dev *idev;
2919 struct net_device *dev;
2920 unsigned long timeout;
2926 if (cfg->plen > 128)
2929 /* check the lifetime */
2930 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
2933 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64)
2936 dev = __dev_get_by_index(net, ifindex);
2940 idev = addrconf_add_dev(dev);
2942 return PTR_ERR(idev);
2944 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
2945 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2946 true, cfg->pfx, ifindex);
2952 cfg->scope = ipv6_addr_scope(cfg->pfx);
2954 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
2955 if (addrconf_finite_timeout(timeout)) {
2956 expires = jiffies_to_clock_t(timeout * HZ);
2957 cfg->valid_lft = timeout;
2958 flags = RTF_EXPIRES;
2962 cfg->ifa_flags |= IFA_F_PERMANENT;
2965 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
2966 if (addrconf_finite_timeout(timeout)) {
2968 cfg->ifa_flags |= IFA_F_DEPRECATED;
2969 cfg->preferred_lft = timeout;
2972 ifp = ipv6_add_addr(idev, cfg, true, extack);
2974 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
2975 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
2976 ifp->rt_priority, dev, expires,
2980 /* Send a netlink notification if DAD is enabled and
2981 * optimistic flag is not set
2983 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD)))
2984 ipv6_ifa_notify(0, ifp);
2986 * Note that section 3.1 of RFC 4429 indicates
2987 * that the Optimistic flag should not be set for
2988 * manually configured addresses
2990 addrconf_dad_start(ifp);
2991 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR)
2992 manage_tempaddrs(idev, ifp, cfg->valid_lft,
2993 cfg->preferred_lft, true, jiffies);
2995 addrconf_verify_rtnl();
2997 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
2998 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false,
3002 return PTR_ERR(ifp);
3005 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
3006 const struct in6_addr *pfx, unsigned int plen)
3008 struct inet6_ifaddr *ifp;
3009 struct inet6_dev *idev;
3010 struct net_device *dev;
3015 dev = __dev_get_by_index(net, ifindex);
3019 idev = __in6_dev_get(dev);
3023 read_lock_bh(&idev->lock);
3024 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3025 if (ifp->prefix_len == plen &&
3026 ipv6_addr_equal(pfx, &ifp->addr)) {
3028 read_unlock_bh(&idev->lock);
3030 if (!(ifp->flags & IFA_F_TEMPORARY) &&
3031 (ifa_flags & IFA_F_MANAGETEMPADDR))
3032 manage_tempaddrs(idev, ifp, 0, 0, false,
3035 addrconf_verify_rtnl();
3036 if (ipv6_addr_is_multicast(pfx)) {
3037 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
3038 false, pfx, dev->ifindex);
3043 read_unlock_bh(&idev->lock);
3044 return -EADDRNOTAVAIL;
3048 int addrconf_add_ifaddr(struct net *net, void __user *arg)
3050 struct ifa6_config cfg = {
3051 .ifa_flags = IFA_F_PERMANENT,
3052 .preferred_lft = INFINITY_LIFE_TIME,
3053 .valid_lft = INFINITY_LIFE_TIME,
3055 struct in6_ifreq ireq;
3058 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3061 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3064 cfg.pfx = &ireq.ifr6_addr;
3065 cfg.plen = ireq.ifr6_prefixlen;
3068 err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL);
3073 int addrconf_del_ifaddr(struct net *net, void __user *arg)
3075 struct in6_ifreq ireq;
3078 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3081 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3085 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
3086 ireq.ifr6_prefixlen);
3091 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
3092 int plen, int scope)
3094 struct inet6_ifaddr *ifp;
3095 struct ifa6_config cfg = {
3098 .ifa_flags = IFA_F_PERMANENT,
3099 .valid_lft = INFINITY_LIFE_TIME,
3100 .preferred_lft = INFINITY_LIFE_TIME,
3104 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
3106 spin_lock_bh(&ifp->lock);
3107 ifp->flags &= ~IFA_F_TENTATIVE;
3108 spin_unlock_bh(&ifp->lock);
3109 rt_genid_bump_ipv6(dev_net(idev->dev));
3110 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3115 #if IS_ENABLED(CONFIG_IPV6_SIT) || IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE)
3116 static void add_v4_addrs(struct inet6_dev *idev)
3118 struct in6_addr addr;
3119 struct net_device *dev;
3120 struct net *net = dev_net(idev->dev);
3121 int scope, plen, offset = 0;
3126 memset(&addr, 0, sizeof(struct in6_addr));
3127 /* in case of IP6GRE the dev_addr is an IPv6 and therefore we use only the last 4 bytes */
3128 if (idev->dev->addr_len == sizeof(struct in6_addr))
3129 offset = sizeof(struct in6_addr) - 4;
3130 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr + offset, 4);
3132 if (idev->dev->flags&IFF_POINTOPOINT) {
3133 if (idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_NONE)
3136 addr.s6_addr32[0] = htonl(0xfe800000);
3140 scope = IPV6_ADDR_COMPATv4;
3142 pflags |= RTF_NONEXTHOP;
3145 if (addr.s6_addr32[3]) {
3146 add_addr(idev, &addr, plen, scope);
3147 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags,
3152 for_each_netdev(net, dev) {
3153 struct in_device *in_dev = __in_dev_get_rtnl(dev);
3154 if (in_dev && (dev->flags & IFF_UP)) {
3155 struct in_ifaddr *ifa;
3158 in_dev_for_each_ifa_rtnl(ifa, in_dev) {
3159 addr.s6_addr32[3] = ifa->ifa_local;
3161 if (ifa->ifa_scope == RT_SCOPE_LINK)
3163 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
3164 if (idev->dev->flags&IFF_POINTOPOINT)
3169 add_addr(idev, &addr, plen, flag);
3170 addrconf_prefix_route(&addr, plen, 0, idev->dev,
3171 0, pflags, GFP_KERNEL);
3178 static void init_loopback(struct net_device *dev)
3180 struct inet6_dev *idev;
3186 idev = ipv6_find_idev(dev);
3188 pr_debug("%s: add_dev failed\n", __func__);
3192 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
3195 void addrconf_add_linklocal(struct inet6_dev *idev,
3196 const struct in6_addr *addr, u32 flags)
3198 struct ifa6_config cfg = {
3201 .ifa_flags = flags | IFA_F_PERMANENT,
3202 .valid_lft = INFINITY_LIFE_TIME,
3203 .preferred_lft = INFINITY_LIFE_TIME,
3206 struct inet6_ifaddr *ifp;
3208 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3209 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad ||
3210 idev->cnf.optimistic_dad) &&
3211 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
3212 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
3215 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
3217 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev,
3219 addrconf_dad_start(ifp);
3223 EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
3225 static bool ipv6_reserved_interfaceid(struct in6_addr address)
3227 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3230 if (address.s6_addr32[2] == htonl(0x02005eff) &&
3231 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3234 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3235 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3241 static int ipv6_generate_stable_address(struct in6_addr *address,
3243 const struct inet6_dev *idev)
3245 static DEFINE_SPINLOCK(lock);
3246 static __u32 digest[SHA1_DIGEST_WORDS];
3247 static __u32 workspace[SHA1_WORKSPACE_WORDS];
3250 char __data[SHA1_BLOCK_SIZE];
3252 struct in6_addr secret;
3254 unsigned char hwaddr[MAX_ADDR_LEN];
3259 struct in6_addr secret;
3260 struct in6_addr temp;
3261 struct net *net = dev_net(idev->dev);
3263 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3265 if (idev->cnf.stable_secret.initialized)
3266 secret = idev->cnf.stable_secret.secret;
3267 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3268 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3273 spin_lock_bh(&lock);
3276 memset(&data, 0, sizeof(data));
3277 memset(workspace, 0, sizeof(workspace));
3278 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3279 data.prefix[0] = address->s6_addr32[0];
3280 data.prefix[1] = address->s6_addr32[1];
3281 data.secret = secret;
3282 data.dad_count = dad_count;
3284 sha1_transform(digest, data.__data, workspace);
3287 temp.s6_addr32[2] = (__force __be32)digest[0];
3288 temp.s6_addr32[3] = (__force __be32)digest[1];
3290 spin_unlock_bh(&lock);
3292 if (ipv6_reserved_interfaceid(temp)) {
3294 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3303 static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3305 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3309 s = &idev->cnf.stable_secret;
3310 get_random_bytes(&s->secret, sizeof(s->secret));
3311 s->initialized = true;
3314 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3316 struct in6_addr addr;
3318 /* no link local addresses on L3 master devices */
3319 if (netif_is_l3_master(idev->dev))
3322 /* no link local addresses on devices flagged as slaves */
3323 if (idev->dev->flags & IFF_SLAVE)
3326 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3328 switch (idev->cnf.addr_gen_mode) {
3329 case IN6_ADDR_GEN_MODE_RANDOM:
3330 ipv6_gen_mode_random_init(idev);
3332 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
3333 if (!ipv6_generate_stable_address(&addr, 0, idev))
3334 addrconf_add_linklocal(idev, &addr,
3335 IFA_F_STABLE_PRIVACY);
3336 else if (prefix_route)
3337 addrconf_prefix_route(&addr, 64, 0, idev->dev,
3340 case IN6_ADDR_GEN_MODE_EUI64:
3341 /* addrconf_add_linklocal also adds a prefix_route and we
3342 * only need to care about prefix routes if ipv6_generate_eui64
3343 * couldn't generate one.
3345 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3346 addrconf_add_linklocal(idev, &addr, 0);
3347 else if (prefix_route)
3348 addrconf_prefix_route(&addr, 64, 0, idev->dev,
3351 case IN6_ADDR_GEN_MODE_NONE:
3353 /* will not add any link local address */
3358 static void addrconf_dev_config(struct net_device *dev)
3360 struct inet6_dev *idev;
3364 if ((dev->type != ARPHRD_ETHER) &&
3365 (dev->type != ARPHRD_FDDI) &&
3366 (dev->type != ARPHRD_ARCNET) &&
3367 (dev->type != ARPHRD_INFINIBAND) &&
3368 (dev->type != ARPHRD_IEEE1394) &&
3369 (dev->type != ARPHRD_TUNNEL6) &&
3370 (dev->type != ARPHRD_6LOWPAN) &&
3371 (dev->type != ARPHRD_TUNNEL) &&
3372 (dev->type != ARPHRD_NONE) &&
3373 (dev->type != ARPHRD_RAWIP)) {
3374 /* Alas, we support only Ethernet autoconfiguration. */
3375 idev = __in6_dev_get(dev);
3376 if (!IS_ERR_OR_NULL(idev) && dev->flags & IFF_UP &&
3377 dev->flags & IFF_MULTICAST)
3382 idev = addrconf_add_dev(dev);
3386 /* this device type has no EUI support */
3387 if (dev->type == ARPHRD_NONE &&
3388 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3389 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
3391 addrconf_addr_gen(idev, false);
3394 #if IS_ENABLED(CONFIG_IPV6_SIT)
3395 static void addrconf_sit_config(struct net_device *dev)
3397 struct inet6_dev *idev;
3402 * Configure the tunnel with one of our IPv4
3403 * addresses... we should configure all of
3404 * our v4 addrs in the tunnel
3407 idev = ipv6_find_idev(dev);
3409 pr_debug("%s: add_dev failed\n", __func__);
3413 if (dev->priv_flags & IFF_ISATAP) {
3414 addrconf_addr_gen(idev, false);
3420 if (dev->flags&IFF_POINTOPOINT)
3421 addrconf_add_mroute(dev);
3425 #if IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE)
3426 static void addrconf_gre_config(struct net_device *dev)
3428 struct inet6_dev *idev;
3432 idev = ipv6_find_idev(dev);
3434 pr_debug("%s: add_dev failed\n", __func__);
3438 if (dev->type == ARPHRD_ETHER) {
3439 addrconf_addr_gen(idev, true);
3445 if (dev->flags & IFF_POINTOPOINT)
3446 addrconf_add_mroute(dev);
3450 static int fixup_permanent_addr(struct net *net,
3451 struct inet6_dev *idev,
3452 struct inet6_ifaddr *ifp)
3454 /* !fib6_node means the host route was removed from the
3455 * FIB, for example, if 'lo' device is taken down. In that
3456 * case regenerate the host route.
3458 if (!ifp->rt || !ifp->rt->fib6_node) {
3459 struct fib6_info *f6i, *prev;
3461 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false,
3464 return PTR_ERR(f6i);
3466 /* ifp->rt can be accessed outside of rtnl */
3467 spin_lock(&ifp->lock);
3470 spin_unlock(&ifp->lock);
3472 fib6_info_release(prev);
3475 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3476 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3477 ifp->rt_priority, idev->dev, 0, 0,
3481 if (ifp->state == INET6_IFADDR_STATE_PREDAD)
3482 addrconf_dad_start(ifp);
3487 static void addrconf_permanent_addr(struct net *net, struct net_device *dev)
3489 struct inet6_ifaddr *ifp, *tmp;
3490 struct inet6_dev *idev;
3492 idev = __in6_dev_get(dev);
3496 write_lock_bh(&idev->lock);
3498 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3499 if ((ifp->flags & IFA_F_PERMANENT) &&
3500 fixup_permanent_addr(net, idev, ifp) < 0) {
3501 write_unlock_bh(&idev->lock);
3504 write_lock_bh(&idev->lock);
3506 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3507 idev->dev->name, &ifp->addr);
3511 write_unlock_bh(&idev->lock);
3514 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3517 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3518 struct netdev_notifier_change_info *change_info;
3519 struct netdev_notifier_changeupper_info *info;
3520 struct inet6_dev *idev = __in6_dev_get(dev);
3521 struct net *net = dev_net(dev);
3522 int run_pending = 0;
3526 case NETDEV_REGISTER:
3527 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3528 idev = ipv6_add_dev(dev);
3530 return notifier_from_errno(PTR_ERR(idev));
3534 case NETDEV_CHANGEMTU:
3535 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3536 if (dev->mtu < IPV6_MIN_MTU) {
3537 addrconf_ifdown(dev, dev != net->loopback_dev);
3542 rt6_mtu_change(dev, dev->mtu);
3543 idev->cnf.mtu6 = dev->mtu;
3547 /* allocate new idev */
3548 idev = ipv6_add_dev(dev);
3552 /* device is still not ready */
3553 if (!(idev->if_flags & IF_READY))
3560 if (dev->flags & IFF_SLAVE)
3563 if (idev && idev->cnf.disable_ipv6)
3566 if (event == NETDEV_UP) {
3567 /* restore routes for permanent addresses */
3568 addrconf_permanent_addr(net, dev);
3570 if (!addrconf_link_ready(dev)) {
3571 /* device is not ready yet. */
3572 pr_debug("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3577 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3578 idev = ipv6_add_dev(dev);
3580 if (!IS_ERR_OR_NULL(idev)) {
3581 idev->if_flags |= IF_READY;
3584 } else if (event == NETDEV_CHANGE) {
3585 if (!addrconf_link_ready(dev)) {
3586 /* device is still not ready. */
3587 rt6_sync_down_dev(dev, event);
3591 if (!IS_ERR_OR_NULL(idev)) {
3592 if (idev->if_flags & IF_READY) {
3593 /* device is already configured -
3594 * but resend MLD reports, we might
3595 * have roamed and need to update
3596 * multicast snooping switches
3600 if (change_info->flags_changed & IFF_NOARP)
3601 addrconf_dad_run(idev, true);
3602 rt6_sync_up(dev, RTNH_F_LINKDOWN);
3605 idev->if_flags |= IF_READY;
3608 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3614 switch (dev->type) {
3615 #if IS_ENABLED(CONFIG_IPV6_SIT)
3617 addrconf_sit_config(dev);
3620 #if IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE)
3623 addrconf_gre_config(dev);
3626 case ARPHRD_LOOPBACK:
3631 addrconf_dev_config(dev);
3635 if (!IS_ERR_OR_NULL(idev)) {
3637 addrconf_dad_run(idev, false);
3639 /* Device has an address by now */
3640 rt6_sync_up(dev, RTNH_F_DEAD);
3643 * If the MTU changed during the interface down,
3644 * when the interface up, the changed MTU must be
3645 * reflected in the idev as well as routers.
3647 if (idev->cnf.mtu6 != dev->mtu &&
3648 dev->mtu >= IPV6_MIN_MTU) {
3649 rt6_mtu_change(dev, dev->mtu);
3650 idev->cnf.mtu6 = dev->mtu;
3652 idev->tstamp = jiffies;
3653 inet6_ifinfo_notify(RTM_NEWLINK, idev);
3656 * If the changed mtu during down is lower than
3657 * IPV6_MIN_MTU stop IPv6 on this interface.
3659 if (dev->mtu < IPV6_MIN_MTU)
3660 addrconf_ifdown(dev, dev != net->loopback_dev);
3665 case NETDEV_UNREGISTER:
3667 * Remove all addresses from this interface.
3669 addrconf_ifdown(dev, event != NETDEV_DOWN);
3672 case NETDEV_CHANGENAME:
3674 snmp6_unregister_dev(idev);
3675 addrconf_sysctl_unregister(idev);
3676 err = addrconf_sysctl_register(idev);
3678 return notifier_from_errno(err);
3679 err = snmp6_register_dev(idev);
3681 addrconf_sysctl_unregister(idev);
3682 return notifier_from_errno(err);
3687 case NETDEV_PRE_TYPE_CHANGE:
3688 case NETDEV_POST_TYPE_CHANGE:
3690 addrconf_type_change(dev, event);
3693 case NETDEV_CHANGEUPPER:
3696 /* flush all routes if dev is linked to or unlinked from
3697 * an L3 master device (e.g., VRF)
3699 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3700 addrconf_ifdown(dev, false);
3707 * addrconf module should be notified of a device going up
3709 static struct notifier_block ipv6_dev_notf = {
3710 .notifier_call = addrconf_notify,
3711 .priority = ADDRCONF_NOTIFY_PRIORITY,
3714 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3716 struct inet6_dev *idev;
3719 idev = __in6_dev_get(dev);
3721 if (event == NETDEV_POST_TYPE_CHANGE)
3722 ipv6_mc_remap(idev);
3723 else if (event == NETDEV_PRE_TYPE_CHANGE)
3724 ipv6_mc_unmap(idev);
3727 static bool addr_is_local(const struct in6_addr *addr)
3729 return ipv6_addr_type(addr) &
3730 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3733 static int addrconf_ifdown(struct net_device *dev, bool unregister)
3735 unsigned long event = unregister ? NETDEV_UNREGISTER : NETDEV_DOWN;
3736 struct net *net = dev_net(dev);
3737 struct inet6_dev *idev;
3738 struct inet6_ifaddr *ifa;
3739 LIST_HEAD(tmp_addr_list);
3740 bool keep_addr = false;
3746 rt6_disable_ip(dev, event);
3748 idev = __in6_dev_get(dev);
3753 * Step 1: remove reference to ipv6 device from parent device.
3759 /* protected by rtnl_lock */
3760 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3762 /* Step 1.5: remove snmp6 entry */
3763 snmp6_unregister_dev(idev);
3767 /* combine the user config with event to determine if permanent
3768 * addresses are to be removed from address hash table
3770 if (!unregister && !idev->cnf.disable_ipv6) {
3771 /* aggregate the system setting and interface setting */
3772 int _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3775 _keep_addr = idev->cnf.keep_addr_on_down;
3777 keep_addr = (_keep_addr > 0);
3780 /* Step 2: clear hash table */
3781 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3782 struct hlist_head *h = &inet6_addr_lst[i];
3784 spin_lock_bh(&addrconf_hash_lock);
3786 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3787 if (ifa->idev == idev) {
3788 addrconf_del_dad_work(ifa);
3789 /* combined flag + permanent flag decide if
3790 * address is retained on a down event
3793 !(ifa->flags & IFA_F_PERMANENT) ||
3794 addr_is_local(&ifa->addr)) {
3795 hlist_del_init_rcu(&ifa->addr_lst);
3800 spin_unlock_bh(&addrconf_hash_lock);
3803 write_lock_bh(&idev->lock);
3805 addrconf_del_rs_timer(idev);
3807 /* Step 2: clear flags for stateless addrconf, repeated down
3810 was_ready = idev->if_flags & IF_READY;
3812 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3814 /* Step 3: clear tempaddr list */
3815 while (!list_empty(&idev->tempaddr_list)) {
3816 ifa = list_first_entry(&idev->tempaddr_list,
3817 struct inet6_ifaddr, tmp_list);
3818 list_del(&ifa->tmp_list);
3819 write_unlock_bh(&idev->lock);
3820 spin_lock_bh(&ifa->lock);
3823 in6_ifa_put(ifa->ifpub);
3826 spin_unlock_bh(&ifa->lock);
3828 write_lock_bh(&idev->lock);
3831 list_for_each_entry(ifa, &idev->addr_list, if_list)
3832 list_add_tail(&ifa->if_list_aux, &tmp_addr_list);
3833 write_unlock_bh(&idev->lock);
3835 while (!list_empty(&tmp_addr_list)) {
3836 struct fib6_info *rt = NULL;
3839 ifa = list_first_entry(&tmp_addr_list,
3840 struct inet6_ifaddr, if_list_aux);
3841 list_del(&ifa->if_list_aux);
3843 addrconf_del_dad_work(ifa);
3845 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3846 !addr_is_local(&ifa->addr);
3848 spin_lock_bh(&ifa->lock);
3851 /* set state to skip the notifier below */
3852 state = INET6_IFADDR_STATE_DEAD;
3853 ifa->state = INET6_IFADDR_STATE_PREDAD;
3854 if (!(ifa->flags & IFA_F_NODAD))
3855 ifa->flags |= IFA_F_TENTATIVE;
3861 ifa->state = INET6_IFADDR_STATE_DEAD;
3864 spin_unlock_bh(&ifa->lock);
3867 ip6_del_rt(net, rt, false);
3869 if (state != INET6_IFADDR_STATE_DEAD) {
3870 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3871 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3873 if (idev->cnf.forwarding)
3874 addrconf_leave_anycast(ifa);
3875 addrconf_leave_solict(ifa->idev, &ifa->addr);
3879 write_lock_bh(&idev->lock);
3880 list_del_rcu(&ifa->if_list);
3881 write_unlock_bh(&idev->lock);
3886 /* Step 5: Discard anycast and multicast list */
3888 ipv6_ac_destroy_dev(idev);
3889 ipv6_mc_destroy_dev(idev);
3890 } else if (was_ready) {
3894 idev->tstamp = jiffies;
3897 /* Last: Shot the device (if unregistered) */
3899 addrconf_sysctl_unregister(idev);
3900 neigh_parms_release(&nd_tbl, idev->nd_parms);
3901 neigh_ifdown(&nd_tbl, dev);
3907 static void addrconf_rs_timer(struct timer_list *t)
3909 struct inet6_dev *idev = from_timer(idev, t, rs_timer);
3910 struct net_device *dev = idev->dev;
3911 struct in6_addr lladdr;
3913 write_lock(&idev->lock);
3914 if (idev->dead || !(idev->if_flags & IF_READY))
3917 if (!ipv6_accept_ra(idev))
3920 /* Announcement received after solicitation was sent */
3921 if (idev->if_flags & IF_RA_RCVD)
3924 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
3925 write_unlock(&idev->lock);
3926 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3927 ndisc_send_rs(dev, &lladdr,
3928 &in6addr_linklocal_allrouters);
3932 write_lock(&idev->lock);
3933 idev->rs_interval = rfc3315_s14_backoff_update(
3934 idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
3935 /* The wait after the last probe can be shorter */
3936 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3937 idev->cnf.rtr_solicits) ?
3938 idev->cnf.rtr_solicit_delay :
3942 * Note: we do not support deprecated "all on-link"
3943 * assumption any longer.
3945 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3949 write_unlock(&idev->lock);
3955 * Duplicate Address Detection
3957 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3959 unsigned long rand_num;
3960 struct inet6_dev *idev = ifp->idev;
3963 if (ifp->flags & IFA_F_OPTIMISTIC)
3966 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3969 if (idev->cnf.enhanced_dad ||
3970 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) {
3972 get_random_bytes(&nonce, 6);
3975 ifp->dad_nonce = nonce;
3976 ifp->dad_probes = idev->cnf.dad_transmits;
3977 addrconf_mod_dad_work(ifp, rand_num);
3980 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3982 struct inet6_dev *idev = ifp->idev;
3983 struct net_device *dev = idev->dev;
3984 bool bump_id, notify = false;
3987 addrconf_join_solict(dev, &ifp->addr);
3989 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3991 read_lock_bh(&idev->lock);
3992 spin_lock(&ifp->lock);
3993 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3997 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3998 (net->ipv6.devconf_all->accept_dad < 1 &&
3999 idev->cnf.accept_dad < 1) ||
4000 !(ifp->flags&IFA_F_TENTATIVE) ||
4001 ifp->flags & IFA_F_NODAD) {
4002 bool send_na = false;
4004 if (ifp->flags & IFA_F_TENTATIVE &&
4005 !(ifp->flags & IFA_F_OPTIMISTIC))
4007 bump_id = ifp->flags & IFA_F_TENTATIVE;
4008 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
4009 spin_unlock(&ifp->lock);
4010 read_unlock_bh(&idev->lock);
4012 addrconf_dad_completed(ifp, bump_id, send_na);
4016 if (!(idev->if_flags & IF_READY)) {
4017 spin_unlock(&ifp->lock);
4018 read_unlock_bh(&idev->lock);
4020 * If the device is not ready:
4021 * - keep it tentative if it is a permanent address.
4022 * - otherwise, kill it.
4025 addrconf_dad_stop(ifp, 0);
4030 * Optimistic nodes can start receiving
4033 if (ifp->flags & IFA_F_OPTIMISTIC) {
4034 ip6_ins_rt(net, ifp->rt);
4035 if (ipv6_use_optimistic_addr(net, idev)) {
4036 /* Because optimistic nodes can use this address,
4037 * notify listeners. If DAD fails, RTM_DELADDR is sent.
4043 addrconf_dad_kick(ifp);
4045 spin_unlock(&ifp->lock);
4046 read_unlock_bh(&idev->lock);
4048 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4051 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
4053 bool begin_dad = false;
4055 spin_lock_bh(&ifp->lock);
4056 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
4057 ifp->state = INET6_IFADDR_STATE_PREDAD;
4060 spin_unlock_bh(&ifp->lock);
4063 addrconf_mod_dad_work(ifp, 0);
4066 static void addrconf_dad_work(struct work_struct *w)
4068 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
4069 struct inet6_ifaddr,
4071 struct inet6_dev *idev = ifp->idev;
4072 bool bump_id, disable_ipv6 = false;
4073 struct in6_addr mcaddr;
4079 } action = DAD_PROCESS;
4083 spin_lock_bh(&ifp->lock);
4084 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
4086 ifp->state = INET6_IFADDR_STATE_DAD;
4087 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
4089 ifp->state = INET6_IFADDR_STATE_POSTDAD;
4091 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 ||
4092 idev->cnf.accept_dad > 1) &&
4093 !idev->cnf.disable_ipv6 &&
4094 !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
4095 struct in6_addr addr;
4097 addr.s6_addr32[0] = htonl(0xfe800000);
4098 addr.s6_addr32[1] = 0;
4100 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
4101 ipv6_addr_equal(&ifp->addr, &addr)) {
4102 /* DAD failed for link-local based on MAC */
4103 idev->cnf.disable_ipv6 = 1;
4105 pr_info("%s: IPv6 being disabled!\n",
4106 ifp->idev->dev->name);
4107 disable_ipv6 = true;
4111 spin_unlock_bh(&ifp->lock);
4113 if (action == DAD_BEGIN) {
4114 addrconf_dad_begin(ifp);
4116 } else if (action == DAD_ABORT) {
4118 addrconf_dad_stop(ifp, 1);
4120 addrconf_ifdown(idev->dev, false);
4124 if (!ifp->dad_probes && addrconf_dad_end(ifp))
4127 write_lock_bh(&idev->lock);
4128 if (idev->dead || !(idev->if_flags & IF_READY)) {
4129 write_unlock_bh(&idev->lock);
4133 spin_lock(&ifp->lock);
4134 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
4135 spin_unlock(&ifp->lock);
4136 write_unlock_bh(&idev->lock);
4140 if (ifp->dad_probes == 0) {
4141 bool send_na = false;
4144 * DAD was successful
4147 if (ifp->flags & IFA_F_TENTATIVE &&
4148 !(ifp->flags & IFA_F_OPTIMISTIC))
4150 bump_id = ifp->flags & IFA_F_TENTATIVE;
4151 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
4152 spin_unlock(&ifp->lock);
4153 write_unlock_bh(&idev->lock);
4155 addrconf_dad_completed(ifp, bump_id, send_na);
4161 addrconf_mod_dad_work(ifp,
4162 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME),
4164 spin_unlock(&ifp->lock);
4165 write_unlock_bh(&idev->lock);
4167 /* send a neighbour solicitation for our addr */
4168 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
4169 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
4176 /* ifp->idev must be at least read locked */
4177 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
4179 struct inet6_ifaddr *ifpiter;
4180 struct inet6_dev *idev = ifp->idev;
4182 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
4183 if (ifpiter->scope > IFA_LINK)
4185 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
4186 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
4187 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
4194 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
4197 struct net_device *dev = ifp->idev->dev;
4198 struct in6_addr lladdr;
4199 bool send_rs, send_mld;
4201 addrconf_del_dad_work(ifp);
4204 * Configure the address for reception. Now it is valid.
4207 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4209 /* If added prefix is link local and we are prepared to process
4210 router advertisements, start sending router solicitations.
4213 read_lock_bh(&ifp->idev->lock);
4214 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
4215 send_rs = send_mld &&
4216 ipv6_accept_ra(ifp->idev) &&
4217 ifp->idev->cnf.rtr_solicits != 0 &&
4218 (dev->flags & IFF_LOOPBACK) == 0 &&
4219 (dev->type != ARPHRD_TUNNEL);
4220 read_unlock_bh(&ifp->idev->lock);
4222 /* While dad is in progress mld report's source address is in6_addrany.
4223 * Resend with proper ll now.
4226 ipv6_mc_dad_complete(ifp->idev);
4228 /* send unsolicited NA if enabled */
4230 (ifp->idev->cnf.ndisc_notify ||
4231 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) {
4232 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr,
4233 /*router=*/ !!ifp->idev->cnf.forwarding,
4234 /*solicited=*/ false, /*override=*/ true,
4240 * If a host as already performed a random delay
4241 * [...] as part of DAD [...] there is no need
4242 * to delay again before sending the first RS
4244 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
4246 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
4248 write_lock_bh(&ifp->idev->lock);
4249 spin_lock(&ifp->lock);
4250 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4251 ifp->idev->cnf.rtr_solicit_interval);
4252 ifp->idev->rs_probes = 1;
4253 ifp->idev->if_flags |= IF_RS_SENT;
4254 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
4255 spin_unlock(&ifp->lock);
4256 write_unlock_bh(&ifp->idev->lock);
4260 rt_genid_bump_ipv6(dev_net(dev));
4262 /* Make sure that a new temporary address will be created
4263 * before this temporary address becomes deprecated.
4265 if (ifp->flags & IFA_F_TEMPORARY)
4266 addrconf_verify_rtnl();
4269 static void addrconf_dad_run(struct inet6_dev *idev, bool restart)
4271 struct inet6_ifaddr *ifp;
4273 read_lock_bh(&idev->lock);
4274 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4275 spin_lock(&ifp->lock);
4276 if ((ifp->flags & IFA_F_TENTATIVE &&
4277 ifp->state == INET6_IFADDR_STATE_DAD) || restart) {
4279 ifp->state = INET6_IFADDR_STATE_PREDAD;
4280 addrconf_dad_kick(ifp);
4282 spin_unlock(&ifp->lock);
4284 read_unlock_bh(&idev->lock);
4287 #ifdef CONFIG_PROC_FS
4288 struct if6_iter_state {
4289 struct seq_net_private p;
4294 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
4296 struct if6_iter_state *state = seq->private;
4297 struct net *net = seq_file_net(seq);
4298 struct inet6_ifaddr *ifa = NULL;
4301 /* initial bucket if pos is 0 */
4307 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
4308 hlist_for_each_entry_rcu(ifa, &inet6_addr_lst[state->bucket],
4310 if (!net_eq(dev_net(ifa->idev->dev), net))
4312 /* sync with offset */
4313 if (p < state->offset) {
4320 /* prepare for next bucket */
4327 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4328 struct inet6_ifaddr *ifa)
4330 struct if6_iter_state *state = seq->private;
4331 struct net *net = seq_file_net(seq);
4333 hlist_for_each_entry_continue_rcu(ifa, addr_lst) {
4334 if (!net_eq(dev_net(ifa->idev->dev), net))
4341 while (++state->bucket < IN6_ADDR_HSIZE) {
4342 hlist_for_each_entry_rcu(ifa,
4343 &inet6_addr_lst[state->bucket], addr_lst) {
4344 if (!net_eq(dev_net(ifa->idev->dev), net))
4353 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4357 return if6_get_first(seq, *pos);
4360 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4362 struct inet6_ifaddr *ifa;
4364 ifa = if6_get_next(seq, v);
4369 static void if6_seq_stop(struct seq_file *seq, void *v)
4375 static int if6_seq_show(struct seq_file *seq, void *v)
4377 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4378 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
4380 ifp->idev->dev->ifindex,
4384 ifp->idev->dev->name);
4388 static const struct seq_operations if6_seq_ops = {
4389 .start = if6_seq_start,
4390 .next = if6_seq_next,
4391 .show = if6_seq_show,
4392 .stop = if6_seq_stop,
4395 static int __net_init if6_proc_net_init(struct net *net)
4397 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops,
4398 sizeof(struct if6_iter_state)))
4403 static void __net_exit if6_proc_net_exit(struct net *net)
4405 remove_proc_entry("if_inet6", net->proc_net);
4408 static struct pernet_operations if6_proc_net_ops = {
4409 .init = if6_proc_net_init,
4410 .exit = if6_proc_net_exit,
4413 int __init if6_proc_init(void)
4415 return register_pernet_subsys(&if6_proc_net_ops);
4418 void if6_proc_exit(void)
4420 unregister_pernet_subsys(&if6_proc_net_ops);
4422 #endif /* CONFIG_PROC_FS */
4424 #if IS_ENABLED(CONFIG_IPV6_MIP6)
4425 /* Check if address is a home address configured on any interface. */
4426 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
4428 unsigned int hash = inet6_addr_hash(net, addr);
4429 struct inet6_ifaddr *ifp = NULL;
4433 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
4434 if (!net_eq(dev_net(ifp->idev->dev), net))
4436 if (ipv6_addr_equal(&ifp->addr, addr) &&
4437 (ifp->flags & IFA_F_HOMEADDRESS)) {
4447 /* RFC6554 has some algorithm to avoid loops in segment routing by
4448 * checking if the segments contains any of a local interface address.
4452 * To detect loops in the SRH, a router MUST determine if the SRH
4453 * includes multiple addresses assigned to any interface on that router.
4454 * If such addresses appear more than once and are separated by at least
4455 * one address not assigned to that router.
4457 int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs,
4458 unsigned char nsegs)
4460 const struct in6_addr *addr;
4461 int i, ret = 0, found = 0;
4462 struct inet6_ifaddr *ifp;
4463 bool separated = false;
4468 for (i = 0; i < nsegs; i++) {
4470 hash = inet6_addr_hash(net, addr);
4473 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
4474 if (!net_eq(dev_net(ifp->idev->dev), net))
4477 if (ipv6_addr_equal(&ifp->addr, addr)) {
4484 if (found > 1 && separated) {
4501 * Periodic address status verification
4504 static void addrconf_verify_rtnl(void)
4506 unsigned long now, next, next_sec, next_sched;
4507 struct inet6_ifaddr *ifp;
4514 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
4516 cancel_delayed_work(&addr_chk_work);
4518 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
4520 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
4523 /* When setting preferred_lft to a value not zero or
4524 * infinity, while valid_lft is infinity
4525 * IFA_F_PERMANENT has a non-infinity life time.
4527 if ((ifp->flags & IFA_F_PERMANENT) &&
4528 (ifp->prefered_lft == INFINITY_LIFE_TIME))
4531 spin_lock(&ifp->lock);
4532 /* We try to batch several events at once. */
4533 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
4535 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4536 age >= ifp->valid_lft) {
4537 spin_unlock(&ifp->lock);
4539 rcu_read_unlock_bh();
4543 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4544 spin_unlock(&ifp->lock);
4546 } else if (age >= ifp->prefered_lft) {
4547 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
4550 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4552 ifp->flags |= IFA_F_DEPRECATED;
4555 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4556 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
4557 next = ifp->tstamp + ifp->valid_lft * HZ;
4559 spin_unlock(&ifp->lock);
4564 ipv6_ifa_notify(0, ifp);
4568 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4569 !(ifp->flags&IFA_F_TENTATIVE)) {
4570 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4571 ifp->idev->cnf.dad_transmits *
4572 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME), HZ/100) / HZ;
4574 if (age >= ifp->prefered_lft - regen_advance) {
4575 struct inet6_ifaddr *ifpub = ifp->ifpub;
4576 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4577 next = ifp->tstamp + ifp->prefered_lft * HZ;
4578 if (!ifp->regen_count && ifpub) {
4581 in6_ifa_hold(ifpub);
4582 spin_unlock(&ifp->lock);
4584 spin_lock(&ifpub->lock);
4585 ifpub->regen_count = 0;
4586 spin_unlock(&ifpub->lock);
4587 rcu_read_unlock_bh();
4588 ipv6_create_tempaddr(ifpub, true);
4594 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4595 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4596 spin_unlock(&ifp->lock);
4598 /* ifp->prefered_lft <= ifp->valid_lft */
4599 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4600 next = ifp->tstamp + ifp->prefered_lft * HZ;
4601 spin_unlock(&ifp->lock);
4606 next_sec = round_jiffies_up(next);
4609 /* If rounded timeout is accurate enough, accept it. */
4610 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4611 next_sched = next_sec;
4613 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4614 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4615 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4617 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4618 now, next, next_sec, next_sched);
4619 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
4620 rcu_read_unlock_bh();
4623 static void addrconf_verify_work(struct work_struct *w)
4626 addrconf_verify_rtnl();
4630 static void addrconf_verify(void)
4632 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4635 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4636 struct in6_addr **peer_pfx)
4638 struct in6_addr *pfx = NULL;
4643 pfx = nla_data(addr);
4646 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4648 pfx = nla_data(local);
4654 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4655 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4656 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4657 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
4658 [IFA_FLAGS] = { .len = sizeof(u32) },
4659 [IFA_RT_PRIORITY] = { .len = sizeof(u32) },
4660 [IFA_TARGET_NETNSID] = { .type = NLA_S32 },
4664 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
4665 struct netlink_ext_ack *extack)
4667 struct net *net = sock_net(skb->sk);
4668 struct ifaddrmsg *ifm;
4669 struct nlattr *tb[IFA_MAX+1];
4670 struct in6_addr *pfx, *peer_pfx;
4674 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4675 ifa_ipv6_policy, extack);
4679 ifm = nlmsg_data(nlh);
4680 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4684 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4686 /* We ignore other flags so far. */
4687 ifa_flags &= IFA_F_MANAGETEMPADDR;
4689 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4690 ifm->ifa_prefixlen);
4693 static int modify_prefix_route(struct inet6_ifaddr *ifp,
4694 unsigned long expires, u32 flags,
4697 struct fib6_info *f6i;
4700 f6i = addrconf_get_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
4702 ifp->idev->dev, 0, RTF_DEFAULT, true);
4706 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF;
4707 if (f6i->fib6_metric != prio) {
4708 /* delete old one */
4709 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false);
4712 addrconf_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
4714 ifp->rt_priority, ifp->idev->dev,
4715 expires, flags, GFP_KERNEL);
4718 fib6_clean_expires(f6i);
4720 fib6_set_expires(f6i, expires);
4722 fib6_info_release(f6i);
4728 static int inet6_addr_modify(struct inet6_ifaddr *ifp, struct ifa6_config *cfg)
4732 unsigned long timeout;
4733 bool was_managetempaddr;
4734 bool had_prefixroute;
4735 bool new_peer = false;
4739 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
4742 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR &&
4743 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4746 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED)
4747 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC;
4749 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
4750 if (addrconf_finite_timeout(timeout)) {
4751 expires = jiffies_to_clock_t(timeout * HZ);
4752 cfg->valid_lft = timeout;
4753 flags = RTF_EXPIRES;
4757 cfg->ifa_flags |= IFA_F_PERMANENT;
4760 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
4761 if (addrconf_finite_timeout(timeout)) {
4763 cfg->ifa_flags |= IFA_F_DEPRECATED;
4764 cfg->preferred_lft = timeout;
4767 if (cfg->peer_pfx &&
4768 memcmp(&ifp->peer_addr, cfg->peer_pfx, sizeof(struct in6_addr))) {
4769 if (!ipv6_addr_any(&ifp->peer_addr))
4770 cleanup_prefix_route(ifp, expires, true, true);
4774 spin_lock_bh(&ifp->lock);
4775 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4776 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4777 !(ifp->flags & IFA_F_NOPREFIXROUTE);
4778 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4779 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4780 IFA_F_NOPREFIXROUTE);
4781 ifp->flags |= cfg->ifa_flags;
4782 ifp->tstamp = jiffies;
4783 ifp->valid_lft = cfg->valid_lft;
4784 ifp->prefered_lft = cfg->preferred_lft;
4786 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority)
4787 ifp->rt_priority = cfg->rt_priority;
4790 ifp->peer_addr = *cfg->peer_pfx;
4792 spin_unlock_bh(&ifp->lock);
4793 if (!(ifp->flags&IFA_F_TENTATIVE))
4794 ipv6_ifa_notify(0, ifp);
4796 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
4799 if (had_prefixroute)
4800 rc = modify_prefix_route(ifp, expires, flags, false);
4802 /* prefix route could have been deleted; if so restore it */
4803 if (rc == -ENOENT) {
4804 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
4805 ifp->rt_priority, ifp->idev->dev,
4806 expires, flags, GFP_KERNEL);
4809 if (had_prefixroute && !ipv6_addr_any(&ifp->peer_addr))
4810 rc = modify_prefix_route(ifp, expires, flags, true);
4812 if (rc == -ENOENT && !ipv6_addr_any(&ifp->peer_addr)) {
4813 addrconf_prefix_route(&ifp->peer_addr, ifp->prefix_len,
4814 ifp->rt_priority, ifp->idev->dev,
4815 expires, flags, GFP_KERNEL);
4817 } else if (had_prefixroute) {
4818 enum cleanup_prefix_rt_t action;
4819 unsigned long rt_expires;
4821 write_lock_bh(&ifp->idev->lock);
4822 action = check_cleanup_prefix_route(ifp, &rt_expires);
4823 write_unlock_bh(&ifp->idev->lock);
4825 if (action != CLEANUP_PREFIX_RT_NOP) {
4826 cleanup_prefix_route(ifp, rt_expires,
4827 action == CLEANUP_PREFIX_RT_DEL, false);
4831 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4832 if (was_managetempaddr &&
4833 !(ifp->flags & IFA_F_MANAGETEMPADDR)) {
4835 cfg->preferred_lft = 0;
4837 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft,
4838 cfg->preferred_lft, !was_managetempaddr,
4842 addrconf_verify_rtnl();
4848 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
4849 struct netlink_ext_ack *extack)
4851 struct net *net = sock_net(skb->sk);
4852 struct ifaddrmsg *ifm;
4853 struct nlattr *tb[IFA_MAX+1];
4854 struct in6_addr *peer_pfx;
4855 struct inet6_ifaddr *ifa;
4856 struct net_device *dev;
4857 struct inet6_dev *idev;
4858 struct ifa6_config cfg;
4861 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4862 ifa_ipv6_policy, extack);
4866 memset(&cfg, 0, sizeof(cfg));
4868 ifm = nlmsg_data(nlh);
4869 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4873 cfg.peer_pfx = peer_pfx;
4874 cfg.plen = ifm->ifa_prefixlen;
4875 if (tb[IFA_RT_PRIORITY])
4876 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]);
4878 cfg.valid_lft = INFINITY_LIFE_TIME;
4879 cfg.preferred_lft = INFINITY_LIFE_TIME;
4881 if (tb[IFA_CACHEINFO]) {
4882 struct ifa_cacheinfo *ci;
4884 ci = nla_data(tb[IFA_CACHEINFO]);
4885 cfg.valid_lft = ci->ifa_valid;
4886 cfg.preferred_lft = ci->ifa_prefered;
4889 dev = __dev_get_by_index(net, ifm->ifa_index);
4894 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]);
4896 cfg.ifa_flags = ifm->ifa_flags;
4898 /* We ignore other flags so far. */
4899 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS |
4900 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE |
4901 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC;
4903 idev = ipv6_find_idev(dev);
4905 return PTR_ERR(idev);
4907 if (!ipv6_allow_optimistic_dad(net, idev))
4908 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC;
4910 if (cfg.ifa_flags & IFA_F_NODAD &&
4911 cfg.ifa_flags & IFA_F_OPTIMISTIC) {
4912 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive");
4916 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1);
4919 * It would be best to check for !NLM_F_CREATE here but
4920 * userspace already relies on not having to provide this.
4922 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack);
4925 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4926 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4929 err = inet6_addr_modify(ifa, &cfg);
4936 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4937 u8 scope, int ifindex)
4939 struct ifaddrmsg *ifm;
4941 ifm = nlmsg_data(nlh);
4942 ifm->ifa_family = AF_INET6;
4943 ifm->ifa_prefixlen = prefixlen;
4944 ifm->ifa_flags = flags;
4945 ifm->ifa_scope = scope;
4946 ifm->ifa_index = ifindex;
4949 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4950 unsigned long tstamp, u32 preferred, u32 valid)
4952 struct ifa_cacheinfo ci;
4954 ci.cstamp = cstamp_delta(cstamp);
4955 ci.tstamp = cstamp_delta(tstamp);
4956 ci.ifa_prefered = preferred;
4957 ci.ifa_valid = valid;
4959 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4962 static inline int rt_scope(int ifa_scope)
4964 if (ifa_scope & IFA_HOST)
4965 return RT_SCOPE_HOST;
4966 else if (ifa_scope & IFA_LINK)
4967 return RT_SCOPE_LINK;
4968 else if (ifa_scope & IFA_SITE)
4969 return RT_SCOPE_SITE;
4971 return RT_SCOPE_UNIVERSE;
4974 static inline int inet6_ifaddr_msgsize(void)
4976 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4977 + nla_total_size(16) /* IFA_LOCAL */
4978 + nla_total_size(16) /* IFA_ADDRESS */
4979 + nla_total_size(sizeof(struct ifa_cacheinfo))
4980 + nla_total_size(4) /* IFA_FLAGS */
4981 + nla_total_size(4) /* IFA_RT_PRIORITY */;
4990 struct inet6_fill_args {
4997 enum addr_type_t type;
5000 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
5001 struct inet6_fill_args *args)
5003 struct nlmsghdr *nlh;
5004 u32 preferred, valid;
5006 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5007 sizeof(struct ifaddrmsg), args->flags);
5011 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
5012 ifa->idev->dev->ifindex);
5014 if (args->netnsid >= 0 &&
5015 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
5018 spin_lock_bh(&ifa->lock);
5019 if (!((ifa->flags&IFA_F_PERMANENT) &&
5020 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
5021 preferred = ifa->prefered_lft;
5022 valid = ifa->valid_lft;
5023 if (preferred != INFINITY_LIFE_TIME) {
5024 long tval = (jiffies - ifa->tstamp)/HZ;
5025 if (preferred > tval)
5029 if (valid != INFINITY_LIFE_TIME) {
5037 preferred = INFINITY_LIFE_TIME;
5038 valid = INFINITY_LIFE_TIME;
5040 spin_unlock_bh(&ifa->lock);
5042 if (!ipv6_addr_any(&ifa->peer_addr)) {
5043 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
5044 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
5047 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
5050 if (ifa->rt_priority &&
5051 nla_put_u32(skb, IFA_RT_PRIORITY, ifa->rt_priority))
5054 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
5057 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
5060 nlmsg_end(skb, nlh);
5064 nlmsg_cancel(skb, nlh);
5068 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
5069 struct inet6_fill_args *args)
5071 struct nlmsghdr *nlh;
5072 u8 scope = RT_SCOPE_UNIVERSE;
5073 int ifindex = ifmca->idev->dev->ifindex;
5075 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
5076 scope = RT_SCOPE_SITE;
5078 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5079 sizeof(struct ifaddrmsg), args->flags);
5083 if (args->netnsid >= 0 &&
5084 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) {
5085 nlmsg_cancel(skb, nlh);
5089 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
5090 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
5091 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
5092 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
5093 nlmsg_cancel(skb, nlh);
5097 nlmsg_end(skb, nlh);
5101 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
5102 struct inet6_fill_args *args)
5104 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt);
5105 int ifindex = dev ? dev->ifindex : 1;
5106 struct nlmsghdr *nlh;
5107 u8 scope = RT_SCOPE_UNIVERSE;
5109 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
5110 scope = RT_SCOPE_SITE;
5112 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5113 sizeof(struct ifaddrmsg), args->flags);
5117 if (args->netnsid >= 0 &&
5118 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) {
5119 nlmsg_cancel(skb, nlh);
5123 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
5124 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
5125 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
5126 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
5127 nlmsg_cancel(skb, nlh);
5131 nlmsg_end(skb, nlh);
5135 /* called with rcu_read_lock() */
5136 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
5137 struct netlink_callback *cb, int s_ip_idx,
5138 struct inet6_fill_args *fillargs)
5140 struct ifmcaddr6 *ifmca;
5141 struct ifacaddr6 *ifaca;
5145 read_lock_bh(&idev->lock);
5146 switch (fillargs->type) {
5147 case UNICAST_ADDR: {
5148 struct inet6_ifaddr *ifa;
5149 fillargs->event = RTM_NEWADDR;
5151 /* unicast address incl. temp addr */
5152 list_for_each_entry(ifa, &idev->addr_list, if_list) {
5153 if (ip_idx < s_ip_idx)
5155 err = inet6_fill_ifaddr(skb, ifa, fillargs);
5158 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
5164 case MULTICAST_ADDR:
5165 read_unlock_bh(&idev->lock);
5166 fillargs->event = RTM_GETMULTICAST;
5168 /* multicast address */
5169 for (ifmca = rtnl_dereference(idev->mc_list);
5171 ifmca = rtnl_dereference(ifmca->next), ip_idx++) {
5172 if (ip_idx < s_ip_idx)
5174 err = inet6_fill_ifmcaddr(skb, ifmca, fillargs);
5178 read_lock_bh(&idev->lock);
5181 fillargs->event = RTM_GETANYCAST;
5182 /* anycast address */
5183 for (ifaca = idev->ac_list; ifaca;
5184 ifaca = ifaca->aca_next, ip_idx++) {
5185 if (ip_idx < s_ip_idx)
5187 err = inet6_fill_ifacaddr(skb, ifaca, fillargs);
5195 read_unlock_bh(&idev->lock);
5196 cb->args[2] = ip_idx;
5200 static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh,
5201 struct inet6_fill_args *fillargs,
5202 struct net **tgt_net, struct sock *sk,
5203 struct netlink_callback *cb)
5205 struct netlink_ext_ack *extack = cb->extack;
5206 struct nlattr *tb[IFA_MAX+1];
5207 struct ifaddrmsg *ifm;
5210 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5211 NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request");
5215 ifm = nlmsg_data(nlh);
5216 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5217 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request");
5221 fillargs->ifindex = ifm->ifa_index;
5222 if (fillargs->ifindex) {
5223 cb->answer_flags |= NLM_F_DUMP_FILTERED;
5224 fillargs->flags |= NLM_F_DUMP_FILTERED;
5227 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5228 ifa_ipv6_policy, extack);
5232 for (i = 0; i <= IFA_MAX; ++i) {
5236 if (i == IFA_TARGET_NETNSID) {
5239 fillargs->netnsid = nla_get_s32(tb[i]);
5240 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid);
5242 fillargs->netnsid = -1;
5243 NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id");
5244 return PTR_ERR(net);
5248 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request");
5256 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
5257 enum addr_type_t type)
5259 const struct nlmsghdr *nlh = cb->nlh;
5260 struct inet6_fill_args fillargs = {
5261 .portid = NETLINK_CB(cb->skb).portid,
5262 .seq = cb->nlh->nlmsg_seq,
5263 .flags = NLM_F_MULTI,
5267 struct net *tgt_net = sock_net(skb->sk);
5268 int idx, s_idx, s_ip_idx;
5270 struct net_device *dev;
5271 struct inet6_dev *idev;
5272 struct hlist_head *head;
5276 s_idx = idx = cb->args[1];
5277 s_ip_idx = cb->args[2];
5279 if (cb->strict_check) {
5280 err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net,
5286 if (fillargs.ifindex) {
5287 dev = __dev_get_by_index(tgt_net, fillargs.ifindex);
5292 idev = __in6_dev_get(dev);
5294 err = in6_dump_addrs(idev, skb, cb, s_ip_idx,
5304 cb->seq = atomic_read(&tgt_net->ipv6.dev_addr_genid) ^ tgt_net->dev_base_seq;
5305 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5307 head = &tgt_net->dev_index_head[h];
5308 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5311 if (h > s_h || idx > s_idx)
5313 idev = __in6_dev_get(dev);
5317 if (in6_dump_addrs(idev, skb, cb, s_ip_idx,
5329 if (fillargs.netnsid >= 0)
5332 return skb->len ? : err;
5335 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
5337 enum addr_type_t type = UNICAST_ADDR;
5339 return inet6_dump_addr(skb, cb, type);
5342 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
5344 enum addr_type_t type = MULTICAST_ADDR;
5346 return inet6_dump_addr(skb, cb, type);
5350 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
5352 enum addr_type_t type = ANYCAST_ADDR;
5354 return inet6_dump_addr(skb, cb, type);
5357 static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb,
5358 const struct nlmsghdr *nlh,
5360 struct netlink_ext_ack *extack)
5362 struct ifaddrmsg *ifm;
5365 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5366 NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request");
5370 if (!netlink_strict_get_check(skb))
5371 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
5372 ifa_ipv6_policy, extack);
5374 ifm = nlmsg_data(nlh);
5375 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5376 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request");
5380 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5381 ifa_ipv6_policy, extack);
5385 for (i = 0; i <= IFA_MAX; i++) {
5390 case IFA_TARGET_NETNSID:
5395 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request");
5403 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
5404 struct netlink_ext_ack *extack)
5406 struct net *tgt_net = sock_net(in_skb->sk);
5407 struct inet6_fill_args fillargs = {
5408 .portid = NETLINK_CB(in_skb).portid,
5409 .seq = nlh->nlmsg_seq,
5410 .event = RTM_NEWADDR,
5414 struct ifaddrmsg *ifm;
5415 struct nlattr *tb[IFA_MAX+1];
5416 struct in6_addr *addr = NULL, *peer;
5417 struct net_device *dev = NULL;
5418 struct inet6_ifaddr *ifa;
5419 struct sk_buff *skb;
5422 err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack);
5426 if (tb[IFA_TARGET_NETNSID]) {
5427 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]);
5429 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk,
5431 if (IS_ERR(tgt_net))
5432 return PTR_ERR(tgt_net);
5435 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
5439 ifm = nlmsg_data(nlh);
5441 dev = dev_get_by_index(tgt_net, ifm->ifa_index);
5443 ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1);
5445 err = -EADDRNOTAVAIL;
5449 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
5455 err = inet6_fill_ifaddr(skb, ifa, &fillargs);
5457 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5458 WARN_ON(err == -EMSGSIZE);
5462 err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid);
5467 if (fillargs.netnsid >= 0)
5473 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
5475 struct sk_buff *skb;
5476 struct net *net = dev_net(ifa->idev->dev);
5477 struct inet6_fill_args fillargs = {
5486 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5490 err = inet6_fill_ifaddr(skb, ifa, &fillargs);
5492 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5493 WARN_ON(err == -EMSGSIZE);
5497 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
5501 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
5504 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
5505 __s32 *array, int bytes)
5507 BUG_ON(bytes < (DEVCONF_MAX * 4));
5509 memset(array, 0, bytes);
5510 array[DEVCONF_FORWARDING] = cnf->forwarding;
5511 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
5512 array[DEVCONF_MTU6] = cnf->mtu6;
5513 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
5514 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
5515 array[DEVCONF_AUTOCONF] = cnf->autoconf;
5516 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
5517 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
5518 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
5519 jiffies_to_msecs(cnf->rtr_solicit_interval);
5520 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
5521 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
5522 array[DEVCONF_RTR_SOLICIT_DELAY] =
5523 jiffies_to_msecs(cnf->rtr_solicit_delay);
5524 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
5525 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
5526 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
5527 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
5528 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
5529 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
5530 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
5531 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
5532 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
5533 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
5534 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
5535 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
5536 array[DEVCONF_RA_DEFRTR_METRIC] = cnf->ra_defrtr_metric;
5537 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
5538 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
5539 #ifdef CONFIG_IPV6_ROUTER_PREF
5540 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
5541 array[DEVCONF_RTR_PROBE_INTERVAL] =
5542 jiffies_to_msecs(cnf->rtr_probe_interval);
5543 #ifdef CONFIG_IPV6_ROUTE_INFO
5544 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen;
5545 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
5548 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
5549 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
5550 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5551 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
5552 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
5554 #ifdef CONFIG_IPV6_MROUTE
5555 array[DEVCONF_MC_FORWARDING] = atomic_read(&cnf->mc_forwarding);
5557 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
5558 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
5559 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5560 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
5561 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
5562 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
5563 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
5564 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
5565 /* we omit DEVCONF_STABLE_SECRET for now */
5566 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
5567 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
5568 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
5569 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
5570 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled;
5571 #ifdef CONFIG_IPV6_SEG6_HMAC
5572 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac;
5574 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad;
5575 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode;
5576 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy;
5577 array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass;
5578 array[DEVCONF_RPL_SEG_ENABLED] = cnf->rpl_seg_enabled;
5579 array[DEVCONF_IOAM6_ENABLED] = cnf->ioam6_enabled;
5580 array[DEVCONF_IOAM6_ID] = cnf->ioam6_id;
5581 array[DEVCONF_IOAM6_ID_WIDE] = cnf->ioam6_id_wide;
5584 static inline size_t inet6_ifla6_size(void)
5586 return nla_total_size(4) /* IFLA_INET6_FLAGS */
5587 + nla_total_size(sizeof(struct ifla_cacheinfo))
5588 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5589 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
5590 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
5591 + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */
5592 + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */
5593 + nla_total_size(4) /* IFLA_INET6_RA_MTU */
5597 static inline size_t inet6_if_nlmsg_size(void)
5599 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5600 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5601 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5602 + nla_total_size(4) /* IFLA_MTU */
5603 + nla_total_size(4) /* IFLA_LINK */
5604 + nla_total_size(1) /* IFLA_OPERSTATE */
5605 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
5608 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
5612 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
5615 /* Use put_unaligned() because stats may not be aligned for u64. */
5616 put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5617 for (i = 1; i < ICMP6_MIB_MAX; i++)
5618 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
5620 memset(&stats[ICMP6_MIB_MAX], 0, pad);
5623 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
5624 int bytes, size_t syncpoff)
5627 u64 buff[IPSTATS_MIB_MAX];
5628 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5632 memset(buff, 0, sizeof(buff));
5633 buff[0] = IPSTATS_MIB_MAX;
5635 for_each_possible_cpu(c) {
5636 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5637 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5640 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5641 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
5644 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5648 case IFLA_INET6_STATS:
5649 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5650 offsetof(struct ipstats_mib, syncp));
5652 case IFLA_INET6_ICMP6STATS:
5653 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
5658 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5659 u32 ext_filter_mask)
5662 struct ifla_cacheinfo ci;
5664 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5665 goto nla_put_failure;
5666 ci.max_reasm_len = IPV6_MAXPLEN;
5667 ci.tstamp = cstamp_delta(idev->tstamp);
5668 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
5669 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
5670 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5671 goto nla_put_failure;
5672 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
5674 goto nla_put_failure;
5675 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5677 /* XXX - MC not implemented */
5679 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5682 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
5684 goto nla_put_failure;
5685 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5687 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
5689 goto nla_put_failure;
5690 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5692 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
5694 goto nla_put_failure;
5695 read_lock_bh(&idev->lock);
5696 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5697 read_unlock_bh(&idev->lock);
5699 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode))
5700 goto nla_put_failure;
5703 nla_put_u32(skb, IFLA_INET6_RA_MTU, idev->ra_mtu))
5704 goto nla_put_failure;
5712 static size_t inet6_get_link_af_size(const struct net_device *dev,
5713 u32 ext_filter_mask)
5715 if (!__in6_dev_get(dev))
5718 return inet6_ifla6_size();
5721 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5722 u32 ext_filter_mask)
5724 struct inet6_dev *idev = __in6_dev_get(dev);
5729 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
5735 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token,
5736 struct netlink_ext_ack *extack)
5738 struct inet6_ifaddr *ifp;
5739 struct net_device *dev = idev->dev;
5740 bool clear_token, update_rs = false;
5741 struct in6_addr ll_addr;
5748 if (dev->flags & IFF_LOOPBACK) {
5749 NL_SET_ERR_MSG_MOD(extack, "Device is loopback");
5753 if (dev->flags & IFF_NOARP) {
5754 NL_SET_ERR_MSG_MOD(extack,
5755 "Device does not do neighbour discovery");
5759 if (!ipv6_accept_ra(idev)) {
5760 NL_SET_ERR_MSG_MOD(extack,
5761 "Router advertisement is disabled on device");
5765 if (idev->cnf.rtr_solicits == 0) {
5766 NL_SET_ERR_MSG(extack,
5767 "Router solicitation is disabled on device");
5771 write_lock_bh(&idev->lock);
5773 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5774 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5776 write_unlock_bh(&idev->lock);
5778 clear_token = ipv6_addr_any(token);
5782 if (!idev->dead && (idev->if_flags & IF_READY) &&
5783 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5784 IFA_F_OPTIMISTIC)) {
5785 /* If we're not ready, then normal ifup will take care
5786 * of this. Otherwise, we need to request our rs here.
5788 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5793 write_lock_bh(&idev->lock);
5796 idev->if_flags |= IF_RS_SENT;
5797 idev->rs_interval = rfc3315_s14_backoff_init(
5798 idev->cnf.rtr_solicit_interval);
5799 idev->rs_probes = 1;
5800 addrconf_mod_rs_timer(idev, idev->rs_interval);
5803 /* Well, that's kinda nasty ... */
5804 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5805 spin_lock(&ifp->lock);
5806 if (ifp->tokenized) {
5808 ifp->prefered_lft = 0;
5810 spin_unlock(&ifp->lock);
5813 write_unlock_bh(&idev->lock);
5814 inet6_ifinfo_notify(RTM_NEWLINK, idev);
5815 addrconf_verify_rtnl();
5819 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5820 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5821 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5822 [IFLA_INET6_RA_MTU] = { .type = NLA_REJECT,
5824 "IFLA_INET6_RA_MTU can not be set" },
5827 static int check_addr_gen_mode(int mode)
5829 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5830 mode != IN6_ADDR_GEN_MODE_NONE &&
5831 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5832 mode != IN6_ADDR_GEN_MODE_RANDOM)
5837 static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5840 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5841 !idev->cnf.stable_secret.initialized &&
5842 !net->ipv6.devconf_dflt->stable_secret.initialized)
5847 static int inet6_validate_link_af(const struct net_device *dev,
5848 const struct nlattr *nla,
5849 struct netlink_ext_ack *extack)
5851 struct nlattr *tb[IFLA_INET6_MAX + 1];
5852 struct inet6_dev *idev = NULL;
5856 idev = __in6_dev_get(dev);
5858 return -EAFNOSUPPORT;
5861 err = nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla,
5862 inet6_af_policy, extack);
5866 if (!tb[IFLA_INET6_TOKEN] && !tb[IFLA_INET6_ADDR_GEN_MODE])
5869 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5870 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5872 if (check_addr_gen_mode(mode) < 0)
5874 if (dev && check_stable_privacy(idev, dev_net(dev), mode) < 0)
5881 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla,
5882 struct netlink_ext_ack *extack)
5884 struct inet6_dev *idev = __in6_dev_get(dev);
5885 struct nlattr *tb[IFLA_INET6_MAX + 1];
5889 return -EAFNOSUPPORT;
5891 if (nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0)
5894 if (tb[IFLA_INET6_TOKEN]) {
5895 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]),
5901 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5902 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5904 idev->cnf.addr_gen_mode = mode;
5910 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
5911 u32 portid, u32 seq, int event, unsigned int flags)
5913 struct net_device *dev = idev->dev;
5914 struct ifinfomsg *hdr;
5915 struct nlmsghdr *nlh;
5918 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
5922 hdr = nlmsg_data(nlh);
5923 hdr->ifi_family = AF_INET6;
5925 hdr->ifi_type = dev->type;
5926 hdr->ifi_index = dev->ifindex;
5927 hdr->ifi_flags = dev_get_flags(dev);
5928 hdr->ifi_change = 0;
5930 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5932 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5933 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
5934 (dev->ifindex != dev_get_iflink(dev) &&
5935 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5936 nla_put_u8(skb, IFLA_OPERSTATE,
5937 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
5938 goto nla_put_failure;
5939 protoinfo = nla_nest_start_noflag(skb, IFLA_PROTINFO);
5941 goto nla_put_failure;
5943 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
5944 goto nla_put_failure;
5946 nla_nest_end(skb, protoinfo);
5947 nlmsg_end(skb, nlh);
5951 nlmsg_cancel(skb, nlh);
5955 static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh,
5956 struct netlink_ext_ack *extack)
5958 struct ifinfomsg *ifm;
5960 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5961 NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request");
5965 if (nlmsg_attrlen(nlh, sizeof(*ifm))) {
5966 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header");
5970 ifm = nlmsg_data(nlh);
5971 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
5972 ifm->ifi_change || ifm->ifi_index) {
5973 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request");
5980 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5982 struct net *net = sock_net(skb->sk);
5985 struct net_device *dev;
5986 struct inet6_dev *idev;
5987 struct hlist_head *head;
5989 /* only requests using strict checking can pass data to
5990 * influence the dump
5992 if (cb->strict_check) {
5993 int err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack);
6000 s_idx = cb->args[1];
6003 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
6005 head = &net->dev_index_head[h];
6006 hlist_for_each_entry_rcu(dev, head, index_hlist) {
6009 idev = __in6_dev_get(dev);
6012 if (inet6_fill_ifinfo(skb, idev,
6013 NETLINK_CB(cb->skb).portid,
6015 RTM_NEWLINK, NLM_F_MULTI) < 0)
6029 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
6031 struct sk_buff *skb;
6032 struct net *net = dev_net(idev->dev);
6035 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
6039 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
6041 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
6042 WARN_ON(err == -EMSGSIZE);
6046 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
6050 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
6053 static inline size_t inet6_prefix_nlmsg_size(void)
6055 return NLMSG_ALIGN(sizeof(struct prefixmsg))
6056 + nla_total_size(sizeof(struct in6_addr))
6057 + nla_total_size(sizeof(struct prefix_cacheinfo));
6060 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
6061 struct prefix_info *pinfo, u32 portid, u32 seq,
6062 int event, unsigned int flags)
6064 struct prefixmsg *pmsg;
6065 struct nlmsghdr *nlh;
6066 struct prefix_cacheinfo ci;
6068 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
6072 pmsg = nlmsg_data(nlh);
6073 pmsg->prefix_family = AF_INET6;
6074 pmsg->prefix_pad1 = 0;
6075 pmsg->prefix_pad2 = 0;
6076 pmsg->prefix_ifindex = idev->dev->ifindex;
6077 pmsg->prefix_len = pinfo->prefix_len;
6078 pmsg->prefix_type = pinfo->type;
6079 pmsg->prefix_pad3 = 0;
6080 pmsg->prefix_flags = 0;
6082 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
6083 if (pinfo->autoconf)
6084 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
6086 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
6087 goto nla_put_failure;
6088 ci.preferred_time = ntohl(pinfo->prefered);
6089 ci.valid_time = ntohl(pinfo->valid);
6090 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
6091 goto nla_put_failure;
6092 nlmsg_end(skb, nlh);
6096 nlmsg_cancel(skb, nlh);
6100 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
6101 struct prefix_info *pinfo)
6103 struct sk_buff *skb;
6104 struct net *net = dev_net(idev->dev);
6107 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
6111 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
6113 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
6114 WARN_ON(err == -EMSGSIZE);
6118 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
6122 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
6125 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
6127 struct net *net = dev_net(ifp->idev->dev);
6132 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
6137 * If the address was optimistic we inserted the route at the
6138 * start of our DAD process, so we don't need to do it again.
6139 * If the device was taken down in the middle of the DAD
6140 * cycle there is a race where we could get here without a
6141 * host route, so nothing to insert. That will be fixed when
6142 * the device is brought up.
6144 if (ifp->rt && !rcu_access_pointer(ifp->rt->fib6_node)) {
6145 ip6_ins_rt(net, ifp->rt);
6146 } else if (!ifp->rt && (ifp->idev->dev->flags & IFF_UP)) {
6147 pr_warn("BUG: Address %pI6c on device %s is missing its host route.\n",
6148 &ifp->addr, ifp->idev->dev->name);
6151 if (ifp->idev->cnf.forwarding)
6152 addrconf_join_anycast(ifp);
6153 if (!ipv6_addr_any(&ifp->peer_addr))
6154 addrconf_prefix_route(&ifp->peer_addr, 128,
6155 ifp->rt_priority, ifp->idev->dev,
6159 if (ifp->idev->cnf.forwarding)
6160 addrconf_leave_anycast(ifp);
6161 addrconf_leave_solict(ifp->idev, &ifp->addr);
6162 if (!ipv6_addr_any(&ifp->peer_addr)) {
6163 struct fib6_info *rt;
6165 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
6166 ifp->idev->dev, 0, 0,
6169 ip6_del_rt(net, rt, false);
6172 ip6_del_rt(net, ifp->rt, false);
6175 rt_genid_bump_ipv6(net);
6178 atomic_inc(&net->ipv6.dev_addr_genid);
6181 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
6183 if (likely(ifp->idev->dead == 0))
6184 __ipv6_ifa_notify(event, ifp);
6187 #ifdef CONFIG_SYSCTL
6189 static int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
6190 void *buffer, size_t *lenp, loff_t *ppos)
6192 int *valp = ctl->data;
6195 struct ctl_table lctl;
6199 * ctl->data points to idev->cnf.forwarding, we should
6200 * not modify it until we get the rtnl lock.
6205 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6208 ret = addrconf_fixup_forwarding(ctl, valp, val);
6214 static int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
6215 void *buffer, size_t *lenp, loff_t *ppos)
6217 struct inet6_dev *idev = ctl->extra1;
6218 int min_mtu = IPV6_MIN_MTU;
6219 struct ctl_table lctl;
6222 lctl.extra1 = &min_mtu;
6223 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
6225 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
6228 static void dev_disable_change(struct inet6_dev *idev)
6230 struct netdev_notifier_info info;
6232 if (!idev || !idev->dev)
6235 netdev_notifier_info_init(&info, idev->dev);
6236 if (idev->cnf.disable_ipv6)
6237 addrconf_notify(NULL, NETDEV_DOWN, &info);
6239 addrconf_notify(NULL, NETDEV_UP, &info);
6242 static void addrconf_disable_change(struct net *net, __s32 newf)
6244 struct net_device *dev;
6245 struct inet6_dev *idev;
6247 for_each_netdev(net, dev) {
6248 idev = __in6_dev_get(dev);
6250 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
6251 idev->cnf.disable_ipv6 = newf;
6253 dev_disable_change(idev);
6258 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
6263 if (!rtnl_trylock())
6264 return restart_syscall();
6266 net = (struct net *)table->extra2;
6270 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
6275 if (p == &net->ipv6.devconf_all->disable_ipv6) {
6276 net->ipv6.devconf_dflt->disable_ipv6 = newf;
6277 addrconf_disable_change(net, newf);
6278 } else if ((!newf) ^ (!old))
6279 dev_disable_change((struct inet6_dev *)table->extra1);
6285 static int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
6286 void *buffer, size_t *lenp, loff_t *ppos)
6288 int *valp = ctl->data;
6291 struct ctl_table lctl;
6295 * ctl->data points to idev->cnf.disable_ipv6, we should
6296 * not modify it until we get the rtnl lock.
6301 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6304 ret = addrconf_disable_ipv6(ctl, valp, val);
6310 static int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
6311 void *buffer, size_t *lenp, loff_t *ppos)
6313 int *valp = ctl->data;
6318 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
6321 if (write && old != new) {
6322 struct net *net = ctl->extra2;
6324 if (!rtnl_trylock())
6325 return restart_syscall();
6327 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
6328 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6329 NETCONFA_PROXY_NEIGH,
6330 NETCONFA_IFINDEX_DEFAULT,
6331 net->ipv6.devconf_dflt);
6332 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
6333 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6334 NETCONFA_PROXY_NEIGH,
6335 NETCONFA_IFINDEX_ALL,
6336 net->ipv6.devconf_all);
6338 struct inet6_dev *idev = ctl->extra1;
6340 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6341 NETCONFA_PROXY_NEIGH,
6351 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
6352 void *buffer, size_t *lenp,
6357 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
6358 struct net *net = (struct net *)ctl->extra2;
6359 struct ctl_table tmp = {
6361 .maxlen = sizeof(new_val),
6365 if (!rtnl_trylock())
6366 return restart_syscall();
6368 new_val = *((u32 *)ctl->data);
6370 ret = proc_douintvec(&tmp, write, buffer, lenp, ppos);
6375 if (check_addr_gen_mode(new_val) < 0) {
6381 if (check_stable_privacy(idev, net, new_val) < 0) {
6386 if (idev->cnf.addr_gen_mode != new_val) {
6387 idev->cnf.addr_gen_mode = new_val;
6388 addrconf_dev_config(idev->dev);
6390 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) {
6391 struct net_device *dev;
6393 net->ipv6.devconf_dflt->addr_gen_mode = new_val;
6394 for_each_netdev(net, dev) {
6395 idev = __in6_dev_get(dev);
6397 idev->cnf.addr_gen_mode != new_val) {
6398 idev->cnf.addr_gen_mode = new_val;
6399 addrconf_dev_config(idev->dev);
6404 *((u32 *)ctl->data) = new_val;
6413 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
6414 void *buffer, size_t *lenp,
6418 struct in6_addr addr;
6419 char str[IPV6_MAX_STRLEN];
6420 struct ctl_table lctl = *ctl;
6421 struct net *net = ctl->extra2;
6422 struct ipv6_stable_secret *secret = ctl->data;
6424 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
6427 lctl.maxlen = IPV6_MAX_STRLEN;
6430 if (!rtnl_trylock())
6431 return restart_syscall();
6433 if (!write && !secret->initialized) {
6438 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
6439 if (err >= sizeof(str)) {
6444 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
6448 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
6453 secret->initialized = true;
6454 secret->secret = addr;
6456 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
6457 struct net_device *dev;
6459 for_each_netdev(net, dev) {
6460 struct inet6_dev *idev = __in6_dev_get(dev);
6463 idev->cnf.addr_gen_mode =
6464 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
6468 struct inet6_dev *idev = ctl->extra1;
6470 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
6480 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
6481 int write, void *buffer,
6485 int *valp = ctl->data;
6488 struct ctl_table lctl;
6491 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
6492 * we should not modify it until we get the rtnl lock.
6497 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6500 ret = addrconf_fixup_linkdown(ctl, valp, val);
6507 void addrconf_set_nopolicy(struct rt6_info *rt, int action)
6511 rt->dst.flags |= DST_NOPOLICY;
6513 rt->dst.flags &= ~DST_NOPOLICY;
6518 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
6520 struct inet6_ifaddr *ifa;
6522 read_lock_bh(&idev->lock);
6523 list_for_each_entry(ifa, &idev->addr_list, if_list) {
6524 spin_lock(&ifa->lock);
6526 /* host routes only use builtin fib6_nh */
6527 struct fib6_nh *nh = ifa->rt->fib6_nh;
6531 ifa->rt->dst_nopolicy = val ? true : false;
6532 if (nh->rt6i_pcpu) {
6533 for_each_possible_cpu(cpu) {
6534 struct rt6_info **rtp;
6536 rtp = per_cpu_ptr(nh->rt6i_pcpu, cpu);
6537 addrconf_set_nopolicy(*rtp, val);
6542 spin_unlock(&ifa->lock);
6544 read_unlock_bh(&idev->lock);
6548 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val)
6550 struct inet6_dev *idev;
6553 if (!rtnl_trylock())
6554 return restart_syscall();
6558 net = (struct net *)ctl->extra2;
6559 if (valp == &net->ipv6.devconf_dflt->disable_policy) {
6564 if (valp == &net->ipv6.devconf_all->disable_policy) {
6565 struct net_device *dev;
6567 for_each_netdev(net, dev) {
6568 idev = __in6_dev_get(dev);
6570 addrconf_disable_policy_idev(idev, val);
6573 idev = (struct inet6_dev *)ctl->extra1;
6574 addrconf_disable_policy_idev(idev, val);
6581 static int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write,
6582 void *buffer, size_t *lenp, loff_t *ppos)
6584 int *valp = ctl->data;
6587 struct ctl_table lctl;
6592 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6594 if (write && (*valp != val))
6595 ret = addrconf_disable_policy(ctl, valp, val);
6603 static int minus_one = -1;
6604 static const int two_five_five = 255;
6605 static u32 ioam6_if_id_max = U16_MAX;
6607 static const struct ctl_table addrconf_sysctl[] = {
6609 .procname = "forwarding",
6610 .data = &ipv6_devconf.forwarding,
6611 .maxlen = sizeof(int),
6613 .proc_handler = addrconf_sysctl_forward,
6616 .procname = "hop_limit",
6617 .data = &ipv6_devconf.hop_limit,
6618 .maxlen = sizeof(int),
6620 .proc_handler = proc_dointvec_minmax,
6621 .extra1 = (void *)SYSCTL_ONE,
6622 .extra2 = (void *)&two_five_five,
6626 .data = &ipv6_devconf.mtu6,
6627 .maxlen = sizeof(int),
6629 .proc_handler = addrconf_sysctl_mtu,
6632 .procname = "accept_ra",
6633 .data = &ipv6_devconf.accept_ra,
6634 .maxlen = sizeof(int),
6636 .proc_handler = proc_dointvec,
6639 .procname = "accept_redirects",
6640 .data = &ipv6_devconf.accept_redirects,
6641 .maxlen = sizeof(int),
6643 .proc_handler = proc_dointvec,
6646 .procname = "autoconf",
6647 .data = &ipv6_devconf.autoconf,
6648 .maxlen = sizeof(int),
6650 .proc_handler = proc_dointvec,
6653 .procname = "dad_transmits",
6654 .data = &ipv6_devconf.dad_transmits,
6655 .maxlen = sizeof(int),
6657 .proc_handler = proc_dointvec,
6660 .procname = "router_solicitations",
6661 .data = &ipv6_devconf.rtr_solicits,
6662 .maxlen = sizeof(int),
6664 .proc_handler = proc_dointvec_minmax,
6665 .extra1 = &minus_one,
6668 .procname = "router_solicitation_interval",
6669 .data = &ipv6_devconf.rtr_solicit_interval,
6670 .maxlen = sizeof(int),
6672 .proc_handler = proc_dointvec_jiffies,
6675 .procname = "router_solicitation_max_interval",
6676 .data = &ipv6_devconf.rtr_solicit_max_interval,
6677 .maxlen = sizeof(int),
6679 .proc_handler = proc_dointvec_jiffies,
6682 .procname = "router_solicitation_delay",
6683 .data = &ipv6_devconf.rtr_solicit_delay,
6684 .maxlen = sizeof(int),
6686 .proc_handler = proc_dointvec_jiffies,
6689 .procname = "force_mld_version",
6690 .data = &ipv6_devconf.force_mld_version,
6691 .maxlen = sizeof(int),
6693 .proc_handler = proc_dointvec,
6696 .procname = "mldv1_unsolicited_report_interval",
6698 &ipv6_devconf.mldv1_unsolicited_report_interval,
6699 .maxlen = sizeof(int),
6701 .proc_handler = proc_dointvec_ms_jiffies,
6704 .procname = "mldv2_unsolicited_report_interval",
6706 &ipv6_devconf.mldv2_unsolicited_report_interval,
6707 .maxlen = sizeof(int),
6709 .proc_handler = proc_dointvec_ms_jiffies,
6712 .procname = "use_tempaddr",
6713 .data = &ipv6_devconf.use_tempaddr,
6714 .maxlen = sizeof(int),
6716 .proc_handler = proc_dointvec,
6719 .procname = "temp_valid_lft",
6720 .data = &ipv6_devconf.temp_valid_lft,
6721 .maxlen = sizeof(int),
6723 .proc_handler = proc_dointvec,
6726 .procname = "temp_prefered_lft",
6727 .data = &ipv6_devconf.temp_prefered_lft,
6728 .maxlen = sizeof(int),
6730 .proc_handler = proc_dointvec,
6733 .procname = "regen_max_retry",
6734 .data = &ipv6_devconf.regen_max_retry,
6735 .maxlen = sizeof(int),
6737 .proc_handler = proc_dointvec,
6740 .procname = "max_desync_factor",
6741 .data = &ipv6_devconf.max_desync_factor,
6742 .maxlen = sizeof(int),
6744 .proc_handler = proc_dointvec,
6747 .procname = "max_addresses",
6748 .data = &ipv6_devconf.max_addresses,
6749 .maxlen = sizeof(int),
6751 .proc_handler = proc_dointvec,
6754 .procname = "accept_ra_defrtr",
6755 .data = &ipv6_devconf.accept_ra_defrtr,
6756 .maxlen = sizeof(int),
6758 .proc_handler = proc_dointvec,
6761 .procname = "ra_defrtr_metric",
6762 .data = &ipv6_devconf.ra_defrtr_metric,
6763 .maxlen = sizeof(u32),
6765 .proc_handler = proc_douintvec_minmax,
6766 .extra1 = (void *)SYSCTL_ONE,
6769 .procname = "accept_ra_min_hop_limit",
6770 .data = &ipv6_devconf.accept_ra_min_hop_limit,
6771 .maxlen = sizeof(int),
6773 .proc_handler = proc_dointvec,
6776 .procname = "accept_ra_pinfo",
6777 .data = &ipv6_devconf.accept_ra_pinfo,
6778 .maxlen = sizeof(int),
6780 .proc_handler = proc_dointvec,
6782 #ifdef CONFIG_IPV6_ROUTER_PREF
6784 .procname = "accept_ra_rtr_pref",
6785 .data = &ipv6_devconf.accept_ra_rtr_pref,
6786 .maxlen = sizeof(int),
6788 .proc_handler = proc_dointvec,
6791 .procname = "router_probe_interval",
6792 .data = &ipv6_devconf.rtr_probe_interval,
6793 .maxlen = sizeof(int),
6795 .proc_handler = proc_dointvec_jiffies,
6797 #ifdef CONFIG_IPV6_ROUTE_INFO
6799 .procname = "accept_ra_rt_info_min_plen",
6800 .data = &ipv6_devconf.accept_ra_rt_info_min_plen,
6801 .maxlen = sizeof(int),
6803 .proc_handler = proc_dointvec,
6806 .procname = "accept_ra_rt_info_max_plen",
6807 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
6808 .maxlen = sizeof(int),
6810 .proc_handler = proc_dointvec,
6815 .procname = "proxy_ndp",
6816 .data = &ipv6_devconf.proxy_ndp,
6817 .maxlen = sizeof(int),
6819 .proc_handler = addrconf_sysctl_proxy_ndp,
6822 .procname = "accept_source_route",
6823 .data = &ipv6_devconf.accept_source_route,
6824 .maxlen = sizeof(int),
6826 .proc_handler = proc_dointvec,
6828 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
6830 .procname = "optimistic_dad",
6831 .data = &ipv6_devconf.optimistic_dad,
6832 .maxlen = sizeof(int),
6834 .proc_handler = proc_dointvec,
6837 .procname = "use_optimistic",
6838 .data = &ipv6_devconf.use_optimistic,
6839 .maxlen = sizeof(int),
6841 .proc_handler = proc_dointvec,
6844 #ifdef CONFIG_IPV6_MROUTE
6846 .procname = "mc_forwarding",
6847 .data = &ipv6_devconf.mc_forwarding,
6848 .maxlen = sizeof(int),
6850 .proc_handler = proc_dointvec,
6854 .procname = "disable_ipv6",
6855 .data = &ipv6_devconf.disable_ipv6,
6856 .maxlen = sizeof(int),
6858 .proc_handler = addrconf_sysctl_disable,
6861 .procname = "accept_dad",
6862 .data = &ipv6_devconf.accept_dad,
6863 .maxlen = sizeof(int),
6865 .proc_handler = proc_dointvec,
6868 .procname = "force_tllao",
6869 .data = &ipv6_devconf.force_tllao,
6870 .maxlen = sizeof(int),
6872 .proc_handler = proc_dointvec
6875 .procname = "ndisc_notify",
6876 .data = &ipv6_devconf.ndisc_notify,
6877 .maxlen = sizeof(int),
6879 .proc_handler = proc_dointvec
6882 .procname = "suppress_frag_ndisc",
6883 .data = &ipv6_devconf.suppress_frag_ndisc,
6884 .maxlen = sizeof(int),
6886 .proc_handler = proc_dointvec
6889 .procname = "accept_ra_from_local",
6890 .data = &ipv6_devconf.accept_ra_from_local,
6891 .maxlen = sizeof(int),
6893 .proc_handler = proc_dointvec,
6896 .procname = "accept_ra_mtu",
6897 .data = &ipv6_devconf.accept_ra_mtu,
6898 .maxlen = sizeof(int),
6900 .proc_handler = proc_dointvec,
6903 .procname = "stable_secret",
6904 .data = &ipv6_devconf.stable_secret,
6905 .maxlen = IPV6_MAX_STRLEN,
6907 .proc_handler = addrconf_sysctl_stable_secret,
6910 .procname = "use_oif_addrs_only",
6911 .data = &ipv6_devconf.use_oif_addrs_only,
6912 .maxlen = sizeof(int),
6914 .proc_handler = proc_dointvec,
6917 .procname = "ignore_routes_with_linkdown",
6918 .data = &ipv6_devconf.ignore_routes_with_linkdown,
6919 .maxlen = sizeof(int),
6921 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
6924 .procname = "drop_unicast_in_l2_multicast",
6925 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
6926 .maxlen = sizeof(int),
6928 .proc_handler = proc_dointvec,
6931 .procname = "drop_unsolicited_na",
6932 .data = &ipv6_devconf.drop_unsolicited_na,
6933 .maxlen = sizeof(int),
6935 .proc_handler = proc_dointvec,
6938 .procname = "keep_addr_on_down",
6939 .data = &ipv6_devconf.keep_addr_on_down,
6940 .maxlen = sizeof(int),
6942 .proc_handler = proc_dointvec,
6946 .procname = "seg6_enabled",
6947 .data = &ipv6_devconf.seg6_enabled,
6948 .maxlen = sizeof(int),
6950 .proc_handler = proc_dointvec,
6952 #ifdef CONFIG_IPV6_SEG6_HMAC
6954 .procname = "seg6_require_hmac",
6955 .data = &ipv6_devconf.seg6_require_hmac,
6956 .maxlen = sizeof(int),
6958 .proc_handler = proc_dointvec,
6962 .procname = "enhanced_dad",
6963 .data = &ipv6_devconf.enhanced_dad,
6964 .maxlen = sizeof(int),
6966 .proc_handler = proc_dointvec,
6969 .procname = "addr_gen_mode",
6970 .data = &ipv6_devconf.addr_gen_mode,
6971 .maxlen = sizeof(int),
6973 .proc_handler = addrconf_sysctl_addr_gen_mode,
6976 .procname = "disable_policy",
6977 .data = &ipv6_devconf.disable_policy,
6978 .maxlen = sizeof(int),
6980 .proc_handler = addrconf_sysctl_disable_policy,
6983 .procname = "ndisc_tclass",
6984 .data = &ipv6_devconf.ndisc_tclass,
6985 .maxlen = sizeof(int),
6987 .proc_handler = proc_dointvec_minmax,
6988 .extra1 = (void *)SYSCTL_ZERO,
6989 .extra2 = (void *)&two_five_five,
6992 .procname = "rpl_seg_enabled",
6993 .data = &ipv6_devconf.rpl_seg_enabled,
6994 .maxlen = sizeof(int),
6996 .proc_handler = proc_dointvec,
6999 .procname = "ioam6_enabled",
7000 .data = &ipv6_devconf.ioam6_enabled,
7001 .maxlen = sizeof(u8),
7003 .proc_handler = proc_dou8vec_minmax,
7004 .extra1 = (void *)SYSCTL_ZERO,
7005 .extra2 = (void *)SYSCTL_ONE,
7008 .procname = "ioam6_id",
7009 .data = &ipv6_devconf.ioam6_id,
7010 .maxlen = sizeof(u32),
7012 .proc_handler = proc_douintvec_minmax,
7013 .extra1 = (void *)SYSCTL_ZERO,
7014 .extra2 = (void *)&ioam6_if_id_max,
7017 .procname = "ioam6_id_wide",
7018 .data = &ipv6_devconf.ioam6_id_wide,
7019 .maxlen = sizeof(u32),
7021 .proc_handler = proc_douintvec,
7028 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
7029 struct inet6_dev *idev, struct ipv6_devconf *p)
7032 struct ctl_table *table;
7033 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
7035 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
7039 for (i = 0; table[i].data; i++) {
7040 table[i].data += (char *)p - (char *)&ipv6_devconf;
7041 /* If one of these is already set, then it is not safe to
7042 * overwrite either of them: this makes proc_dointvec_minmax
7045 if (!table[i].extra1 && !table[i].extra2) {
7046 table[i].extra1 = idev; /* embedded; no ref */
7047 table[i].extra2 = net;
7051 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
7053 p->sysctl_header = register_net_sysctl(net, path, table);
7054 if (!p->sysctl_header)
7057 if (!strcmp(dev_name, "all"))
7058 ifindex = NETCONFA_IFINDEX_ALL;
7059 else if (!strcmp(dev_name, "default"))
7060 ifindex = NETCONFA_IFINDEX_DEFAULT;
7062 ifindex = idev->dev->ifindex;
7063 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
7073 static void __addrconf_sysctl_unregister(struct net *net,
7074 struct ipv6_devconf *p, int ifindex)
7076 struct ctl_table *table;
7078 if (!p->sysctl_header)
7081 table = p->sysctl_header->ctl_table_arg;
7082 unregister_net_sysctl_table(p->sysctl_header);
7083 p->sysctl_header = NULL;
7086 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
7089 static int addrconf_sysctl_register(struct inet6_dev *idev)
7093 if (!sysctl_dev_name_is_allowed(idev->dev->name))
7096 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
7097 &ndisc_ifinfo_sysctl_change);
7100 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
7103 neigh_sysctl_unregister(idev->nd_parms);
7108 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
7110 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf,
7111 idev->dev->ifindex);
7112 neigh_sysctl_unregister(idev->nd_parms);
7118 static int __net_init addrconf_init_net(struct net *net)
7121 struct ipv6_devconf *all, *dflt;
7123 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
7127 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
7129 goto err_alloc_dflt;
7131 if (IS_ENABLED(CONFIG_SYSCTL) &&
7132 !net_eq(net, &init_net)) {
7133 switch (sysctl_devconf_inherit_init_net) {
7134 case 1: /* copy from init_net */
7135 memcpy(all, init_net.ipv6.devconf_all,
7136 sizeof(ipv6_devconf));
7137 memcpy(dflt, init_net.ipv6.devconf_dflt,
7138 sizeof(ipv6_devconf_dflt));
7140 case 3: /* copy from the current netns */
7141 memcpy(all, current->nsproxy->net_ns->ipv6.devconf_all,
7142 sizeof(ipv6_devconf));
7144 current->nsproxy->net_ns->ipv6.devconf_dflt,
7145 sizeof(ipv6_devconf_dflt));
7149 /* use compiled values */
7154 /* these will be inherited by all namespaces */
7155 dflt->autoconf = ipv6_defaults.autoconf;
7156 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
7158 dflt->stable_secret.initialized = false;
7159 all->stable_secret.initialized = false;
7161 net->ipv6.devconf_all = all;
7162 net->ipv6.devconf_dflt = dflt;
7164 #ifdef CONFIG_SYSCTL
7165 err = __addrconf_sysctl_register(net, "all", NULL, all);
7169 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
7175 #ifdef CONFIG_SYSCTL
7177 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
7187 static void __net_exit addrconf_exit_net(struct net *net)
7189 #ifdef CONFIG_SYSCTL
7190 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt,
7191 NETCONFA_IFINDEX_DEFAULT);
7192 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all,
7193 NETCONFA_IFINDEX_ALL);
7195 kfree(net->ipv6.devconf_dflt);
7196 kfree(net->ipv6.devconf_all);
7199 static struct pernet_operations addrconf_ops = {
7200 .init = addrconf_init_net,
7201 .exit = addrconf_exit_net,
7204 static struct rtnl_af_ops inet6_ops __read_mostly = {
7206 .fill_link_af = inet6_fill_link_af,
7207 .get_link_af_size = inet6_get_link_af_size,
7208 .validate_link_af = inet6_validate_link_af,
7209 .set_link_af = inet6_set_link_af,
7213 * Init / cleanup code
7216 int __init addrconf_init(void)
7218 struct inet6_dev *idev;
7221 err = ipv6_addr_label_init();
7223 pr_crit("%s: cannot initialize default policy table: %d\n",
7228 err = register_pernet_subsys(&addrconf_ops);
7232 addrconf_wq = create_workqueue("ipv6_addrconf");
7238 /* The addrconf netdev notifier requires that loopback_dev
7239 * has it's ipv6 private information allocated and setup
7240 * before it can bring up and give link-local addresses
7241 * to other devices which are up.
7243 * Unfortunately, loopback_dev is not necessarily the first
7244 * entry in the global dev_base list of net devices. In fact,
7245 * it is likely to be the very last entry on that list.
7246 * So this causes the notifier registry below to try and
7247 * give link-local addresses to all devices besides loopback_dev
7248 * first, then loopback_dev, which cases all the non-loopback_dev
7249 * devices to fail to get a link-local address.
7251 * So, as a temporary fix, allocate the ipv6 structure for
7252 * loopback_dev first by hand.
7253 * Longer term, all of the dependencies ipv6 has upon the loopback
7254 * device and it being up should be removed.
7257 idev = ipv6_add_dev(init_net.loopback_dev);
7260 err = PTR_ERR(idev);
7264 ip6_route_init_special_entries();
7266 for (i = 0; i < IN6_ADDR_HSIZE; i++)
7267 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
7269 register_netdevice_notifier(&ipv6_dev_notf);
7273 rtnl_af_register(&inet6_ops);
7275 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK,
7276 NULL, inet6_dump_ifinfo, 0);
7280 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR,
7281 inet6_rtm_newaddr, NULL, 0);
7284 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR,
7285 inet6_rtm_deladdr, NULL, 0);
7288 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR,
7289 inet6_rtm_getaddr, inet6_dump_ifaddr,
7290 RTNL_FLAG_DOIT_UNLOCKED);
7293 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST,
7294 NULL, inet6_dump_ifmcaddr, 0);
7297 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST,
7298 NULL, inet6_dump_ifacaddr, 0);
7301 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF,
7302 inet6_netconf_get_devconf,
7303 inet6_netconf_dump_devconf,
7304 RTNL_FLAG_DOIT_UNLOCKED);
7307 err = ipv6_addr_label_rtnl_register();
7313 rtnl_unregister_all(PF_INET6);
7314 rtnl_af_unregister(&inet6_ops);
7315 unregister_netdevice_notifier(&ipv6_dev_notf);
7317 destroy_workqueue(addrconf_wq);
7319 unregister_pernet_subsys(&addrconf_ops);
7321 ipv6_addr_label_cleanup();
7326 void addrconf_cleanup(void)
7328 struct net_device *dev;
7331 unregister_netdevice_notifier(&ipv6_dev_notf);
7332 unregister_pernet_subsys(&addrconf_ops);
7333 ipv6_addr_label_cleanup();
7335 rtnl_af_unregister(&inet6_ops);
7339 /* clean dev list */
7340 for_each_netdev(&init_net, dev) {
7341 if (__in6_dev_get(dev) == NULL)
7343 addrconf_ifdown(dev, true);
7345 addrconf_ifdown(init_net.loopback_dev, true);
7350 spin_lock_bh(&addrconf_hash_lock);
7351 for (i = 0; i < IN6_ADDR_HSIZE; i++)
7352 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
7353 spin_unlock_bh(&addrconf_hash_lock);
7354 cancel_delayed_work(&addr_chk_work);
7357 destroy_workqueue(addrconf_wq);