1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * IPv6 Address [auto]configuration
4 * Linux INET6 implementation
7 * Pedro Roque <roque@di.fc.ul.pt>
8 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
14 * Janos Farkas : delete timer on ifdown
15 * <chexum@bankinf.banki.hu>
16 * Andi Kleen : kill double kfree on module
18 * Maciej W. Rozycki : FDDI support
19 * sekiya@USAGI : Don't send too many RS
21 * yoshfuji@USAGI : Fixed interval between DAD
23 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
24 * address validation timer.
25 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
27 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
28 * address on a same interface.
29 * YOSHIFUJI Hideaki @USAGI : ARCnet support
30 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
32 * YOSHIFUJI Hideaki @USAGI : improved source address
33 * selection; consider scope,
37 #define pr_fmt(fmt) "IPv6: " fmt
39 #include <linux/errno.h>
40 #include <linux/types.h>
41 #include <linux/kernel.h>
42 #include <linux/sched/signal.h>
43 #include <linux/socket.h>
44 #include <linux/sockios.h>
45 #include <linux/net.h>
46 #include <linux/inet.h>
47 #include <linux/in6.h>
48 #include <linux/netdevice.h>
49 #include <linux/if_addr.h>
50 #include <linux/if_arp.h>
51 #include <linux/if_arcnet.h>
52 #include <linux/if_infiniband.h>
53 #include <linux/route.h>
54 #include <linux/inetdevice.h>
55 #include <linux/init.h>
56 #include <linux/slab.h>
58 #include <linux/sysctl.h>
60 #include <linux/capability.h>
61 #include <linux/delay.h>
62 #include <linux/notifier.h>
63 #include <linux/string.h>
64 #include <linux/hash.h>
66 #include <net/net_namespace.h>
70 #include <net/6lowpan.h>
71 #include <net/firewire.h>
73 #include <net/protocol.h>
74 #include <net/ndisc.h>
75 #include <net/ip6_route.h>
76 #include <net/addrconf.h>
79 #include <net/netlink.h>
80 #include <net/pkt_sched.h>
81 #include <net/l3mdev.h>
82 #include <linux/if_tunnel.h>
83 #include <linux/rtnetlink.h>
84 #include <linux/netconf.h>
85 #include <linux/random.h>
86 #include <linux/uaccess.h>
87 #include <asm/unaligned.h>
89 #include <linux/proc_fs.h>
90 #include <linux/seq_file.h>
91 #include <linux/export.h>
93 #define INFINITY_LIFE_TIME 0xFFFFFFFF
95 #define IPV6_MAX_STRLEN \
96 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
98 static inline u32 cstamp_delta(unsigned long cstamp)
100 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
103 static inline s32 rfc3315_s14_backoff_init(s32 irt)
105 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */
106 u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt;
107 do_div(tmp, 1000000);
111 static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt)
113 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */
114 u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt;
115 do_div(tmp, 1000000);
116 if ((s32)tmp > mrt) {
117 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */
118 tmp = (900000 + prandom_u32() % 200001) * (u64)mrt;
119 do_div(tmp, 1000000);
125 static int addrconf_sysctl_register(struct inet6_dev *idev);
126 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
128 static inline int addrconf_sysctl_register(struct inet6_dev *idev)
133 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
138 static void ipv6_regen_rndid(struct inet6_dev *idev);
139 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
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, int how);
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 .accept_ra_from_local = 0,
210 .accept_ra_min_hop_limit= 1,
211 .accept_ra_pinfo = 1,
212 #ifdef CONFIG_IPV6_ROUTER_PREF
213 .accept_ra_rtr_pref = 1,
214 .rtr_probe_interval = 60 * HZ,
215 #ifdef CONFIG_IPV6_ROUTE_INFO
216 .accept_ra_rt_info_min_plen = 0,
217 .accept_ra_rt_info_max_plen = 0,
221 .accept_source_route = 0, /* we do not accept RH0 by default. */
224 .suppress_frag_ndisc = 1,
227 .initialized = false,
229 .use_oif_addrs_only = 0,
230 .ignore_routes_with_linkdown = 0,
231 .keep_addr_on_down = 0,
233 #ifdef CONFIG_IPV6_SEG6_HMAC
234 .seg6_require_hmac = 0,
237 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
241 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
243 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
244 .mtu6 = IPV6_MIN_MTU,
246 .accept_redirects = 1,
248 .force_mld_version = 0,
249 .mldv1_unsolicited_report_interval = 10 * HZ,
250 .mldv2_unsolicited_report_interval = HZ,
252 .rtr_solicits = MAX_RTR_SOLICITATIONS,
253 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
254 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
255 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
257 .temp_valid_lft = TEMP_VALID_LIFETIME,
258 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
259 .regen_max_retry = REGEN_MAX_RETRY,
260 .max_desync_factor = MAX_DESYNC_FACTOR,
261 .max_addresses = IPV6_MAX_ADDRESSES,
262 .accept_ra_defrtr = 1,
263 .accept_ra_from_local = 0,
264 .accept_ra_min_hop_limit= 1,
265 .accept_ra_pinfo = 1,
266 #ifdef CONFIG_IPV6_ROUTER_PREF
267 .accept_ra_rtr_pref = 1,
268 .rtr_probe_interval = 60 * HZ,
269 #ifdef CONFIG_IPV6_ROUTE_INFO
270 .accept_ra_rt_info_min_plen = 0,
271 .accept_ra_rt_info_max_plen = 0,
275 .accept_source_route = 0, /* we do not accept RH0 by default. */
278 .suppress_frag_ndisc = 1,
281 .initialized = false,
283 .use_oif_addrs_only = 0,
284 .ignore_routes_with_linkdown = 0,
285 .keep_addr_on_down = 0,
287 #ifdef CONFIG_IPV6_SEG6_HMAC
288 .seg6_require_hmac = 0,
291 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
295 /* Check if link is ready: is it up and is a valid qdisc available */
296 static inline bool addrconf_link_ready(const struct net_device *dev)
298 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev);
301 static void addrconf_del_rs_timer(struct inet6_dev *idev)
303 if (del_timer(&idev->rs_timer))
307 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
309 if (cancel_delayed_work(&ifp->dad_work))
313 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
316 if (!timer_pending(&idev->rs_timer))
318 mod_timer(&idev->rs_timer, jiffies + when);
321 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
325 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay))
329 static int snmp6_alloc_dev(struct inet6_dev *idev)
333 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
334 if (!idev->stats.ipv6)
337 for_each_possible_cpu(i) {
338 struct ipstats_mib *addrconf_stats;
339 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
340 u64_stats_init(&addrconf_stats->syncp);
344 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
346 if (!idev->stats.icmpv6dev)
348 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
350 if (!idev->stats.icmpv6msgdev)
356 kfree(idev->stats.icmpv6dev);
358 free_percpu(idev->stats.ipv6);
363 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
365 struct inet6_dev *ndev;
370 if (dev->mtu < IPV6_MIN_MTU)
371 return ERR_PTR(-EINVAL);
373 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
377 rwlock_init(&ndev->lock);
379 INIT_LIST_HEAD(&ndev->addr_list);
380 timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0);
381 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
383 if (ndev->cnf.stable_secret.initialized)
384 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
386 ndev->cnf.mtu6 = dev->mtu;
387 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
388 if (!ndev->nd_parms) {
392 if (ndev->cnf.forwarding)
393 dev_disable_lro(dev);
394 /* We refer to the device */
397 if (snmp6_alloc_dev(ndev) < 0) {
398 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n",
400 neigh_parms_release(&nd_tbl, ndev->nd_parms);
406 if (snmp6_register_dev(ndev) < 0) {
407 netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n",
408 __func__, dev->name);
412 /* One reference from device. */
413 refcount_set(&ndev->refcnt, 1);
415 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
416 ndev->cnf.accept_dad = -1;
418 #if IS_ENABLED(CONFIG_IPV6_SIT)
419 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
420 pr_info("%s: Disabled Multicast RS\n", dev->name);
421 ndev->cnf.rtr_solicits = 0;
425 INIT_LIST_HEAD(&ndev->tempaddr_list);
426 ndev->desync_factor = U32_MAX;
427 if ((dev->flags&IFF_LOOPBACK) ||
428 dev->type == ARPHRD_TUNNEL ||
429 dev->type == ARPHRD_TUNNEL6 ||
430 dev->type == ARPHRD_SIT ||
431 dev->type == ARPHRD_NONE) {
432 ndev->cnf.use_tempaddr = -1;
434 ipv6_regen_rndid(ndev);
436 ndev->token = in6addr_any;
438 if (netif_running(dev) && addrconf_link_ready(dev))
439 ndev->if_flags |= IF_READY;
441 ipv6_mc_init_dev(ndev);
442 ndev->tstamp = jiffies;
443 err = addrconf_sysctl_register(ndev);
445 ipv6_mc_destroy_dev(ndev);
446 snmp6_unregister_dev(ndev);
449 /* protected by rtnl_lock */
450 rcu_assign_pointer(dev->ip6_ptr, ndev);
452 /* Join interface-local all-node multicast group */
453 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
455 /* Join all-node multicast group */
456 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
458 /* Join all-router multicast group if forwarding is set */
459 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
460 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
465 neigh_parms_release(&nd_tbl, ndev->nd_parms);
467 in6_dev_finish_destroy(ndev);
471 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
473 struct inet6_dev *idev;
477 idev = __in6_dev_get(dev);
479 idev = ipv6_add_dev(dev);
484 if (dev->flags&IFF_UP)
489 static int inet6_netconf_msgsize_devconf(int type)
491 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
492 + nla_total_size(4); /* NETCONFA_IFINDEX */
495 if (type == NETCONFA_ALL)
498 if (all || type == NETCONFA_FORWARDING)
499 size += nla_total_size(4);
500 #ifdef CONFIG_IPV6_MROUTE
501 if (all || type == NETCONFA_MC_FORWARDING)
502 size += nla_total_size(4);
504 if (all || type == NETCONFA_PROXY_NEIGH)
505 size += nla_total_size(4);
507 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
508 size += nla_total_size(4);
513 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
514 struct ipv6_devconf *devconf, u32 portid,
515 u32 seq, int event, unsigned int flags,
518 struct nlmsghdr *nlh;
519 struct netconfmsg *ncm;
522 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
527 if (type == NETCONFA_ALL)
530 ncm = nlmsg_data(nlh);
531 ncm->ncm_family = AF_INET6;
533 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
534 goto nla_put_failure;
539 if ((all || type == NETCONFA_FORWARDING) &&
540 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
541 goto nla_put_failure;
542 #ifdef CONFIG_IPV6_MROUTE
543 if ((all || type == NETCONFA_MC_FORWARDING) &&
544 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
545 atomic_read(&devconf->mc_forwarding)) < 0)
546 goto nla_put_failure;
548 if ((all || type == NETCONFA_PROXY_NEIGH) &&
549 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
550 goto nla_put_failure;
552 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
553 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
554 devconf->ignore_routes_with_linkdown) < 0)
555 goto nla_put_failure;
562 nlmsg_cancel(skb, nlh);
566 void inet6_netconf_notify_devconf(struct net *net, int event, int type,
567 int ifindex, struct ipv6_devconf *devconf)
572 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL);
576 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
579 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
580 WARN_ON(err == -EMSGSIZE);
584 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL);
587 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
590 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
591 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
592 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
593 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
594 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
597 static int inet6_netconf_valid_get_req(struct sk_buff *skb,
598 const struct nlmsghdr *nlh,
600 struct netlink_ext_ack *extack)
604 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) {
605 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf get request");
609 if (!netlink_strict_get_check(skb))
610 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg),
612 devconf_ipv6_policy, extack);
614 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg),
616 devconf_ipv6_policy, extack);
620 for (i = 0; i <= NETCONFA_MAX; i++) {
625 case NETCONFA_IFINDEX:
628 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request");
636 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
637 struct nlmsghdr *nlh,
638 struct netlink_ext_ack *extack)
640 struct net *net = sock_net(in_skb->sk);
641 struct nlattr *tb[NETCONFA_MAX+1];
642 struct inet6_dev *in6_dev = NULL;
643 struct net_device *dev = NULL;
645 struct ipv6_devconf *devconf;
649 err = inet6_netconf_valid_get_req(in_skb, nlh, tb, extack);
653 if (!tb[NETCONFA_IFINDEX])
657 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
659 case NETCONFA_IFINDEX_ALL:
660 devconf = net->ipv6.devconf_all;
662 case NETCONFA_IFINDEX_DEFAULT:
663 devconf = net->ipv6.devconf_dflt;
666 dev = dev_get_by_index(net, ifindex);
669 in6_dev = in6_dev_get(dev);
672 devconf = &in6_dev->cnf;
677 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL);
681 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
682 NETLINK_CB(in_skb).portid,
683 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
686 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
687 WARN_ON(err == -EMSGSIZE);
691 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
694 in6_dev_put(in6_dev);
700 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
701 struct netlink_callback *cb)
703 const struct nlmsghdr *nlh = cb->nlh;
704 struct net *net = sock_net(skb->sk);
707 struct net_device *dev;
708 struct inet6_dev *idev;
709 struct hlist_head *head;
711 if (cb->strict_check) {
712 struct netlink_ext_ack *extack = cb->extack;
713 struct netconfmsg *ncm;
715 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) {
716 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request");
720 if (nlmsg_attrlen(nlh, sizeof(*ncm))) {
721 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request");
727 s_idx = idx = cb->args[1];
729 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
731 head = &net->dev_index_head[h];
733 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
735 hlist_for_each_entry_rcu(dev, head, index_hlist) {
738 idev = __in6_dev_get(dev);
742 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
744 NETLINK_CB(cb->skb).portid,
752 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
758 if (h == NETDEV_HASHENTRIES) {
759 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
760 net->ipv6.devconf_all,
761 NETLINK_CB(cb->skb).portid,
763 RTM_NEWNETCONF, NLM_F_MULTI,
769 if (h == NETDEV_HASHENTRIES + 1) {
770 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
771 net->ipv6.devconf_dflt,
772 NETLINK_CB(cb->skb).portid,
774 RTM_NEWNETCONF, NLM_F_MULTI,
788 static void dev_forward_change(struct inet6_dev *idev)
790 struct net_device *dev;
791 struct inet6_ifaddr *ifa;
792 LIST_HEAD(tmp_addr_list);
797 if (idev->cnf.forwarding)
798 dev_disable_lro(dev);
799 if (dev->flags & IFF_MULTICAST) {
800 if (idev->cnf.forwarding) {
801 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
802 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
803 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
805 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
806 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
807 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
811 read_lock_bh(&idev->lock);
812 list_for_each_entry(ifa, &idev->addr_list, if_list) {
813 if (ifa->flags&IFA_F_TENTATIVE)
815 list_add_tail(&ifa->if_list_aux, &tmp_addr_list);
817 read_unlock_bh(&idev->lock);
819 while (!list_empty(&tmp_addr_list)) {
820 ifa = list_first_entry(&tmp_addr_list,
821 struct inet6_ifaddr, if_list_aux);
822 list_del(&ifa->if_list_aux);
823 if (idev->cnf.forwarding)
824 addrconf_join_anycast(ifa);
826 addrconf_leave_anycast(ifa);
829 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
831 dev->ifindex, &idev->cnf);
835 static void addrconf_forward_change(struct net *net, __s32 newf)
837 struct net_device *dev;
838 struct inet6_dev *idev;
840 for_each_netdev(net, dev) {
841 idev = __in6_dev_get(dev);
843 int changed = (!idev->cnf.forwarding) ^ (!newf);
844 idev->cnf.forwarding = newf;
846 dev_forward_change(idev);
851 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
857 return restart_syscall();
859 net = (struct net *)table->extra2;
863 if (p == &net->ipv6.devconf_dflt->forwarding) {
864 if ((!newf) ^ (!old))
865 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
867 NETCONFA_IFINDEX_DEFAULT,
868 net->ipv6.devconf_dflt);
873 if (p == &net->ipv6.devconf_all->forwarding) {
874 int old_dflt = net->ipv6.devconf_dflt->forwarding;
876 net->ipv6.devconf_dflt->forwarding = newf;
877 if ((!newf) ^ (!old_dflt))
878 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
880 NETCONFA_IFINDEX_DEFAULT,
881 net->ipv6.devconf_dflt);
883 addrconf_forward_change(net, newf);
884 if ((!newf) ^ (!old))
885 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
887 NETCONFA_IFINDEX_ALL,
888 net->ipv6.devconf_all);
889 } else if ((!newf) ^ (!old))
890 dev_forward_change((struct inet6_dev *)table->extra1);
894 rt6_purge_dflt_routers(net);
898 static void addrconf_linkdown_change(struct net *net, __s32 newf)
900 struct net_device *dev;
901 struct inet6_dev *idev;
903 for_each_netdev(net, dev) {
904 idev = __in6_dev_get(dev);
906 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
908 idev->cnf.ignore_routes_with_linkdown = newf;
910 inet6_netconf_notify_devconf(dev_net(dev),
912 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
919 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
925 return restart_syscall();
927 net = (struct net *)table->extra2;
931 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
932 if ((!newf) ^ (!old))
933 inet6_netconf_notify_devconf(net,
935 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
936 NETCONFA_IFINDEX_DEFAULT,
937 net->ipv6.devconf_dflt);
942 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
943 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
944 addrconf_linkdown_change(net, newf);
945 if ((!newf) ^ (!old))
946 inet6_netconf_notify_devconf(net,
948 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
949 NETCONFA_IFINDEX_ALL,
950 net->ipv6.devconf_all);
959 /* Nobody refers to this ifaddr, destroy it */
960 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
962 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
964 #ifdef NET_REFCNT_DEBUG
965 pr_debug("%s\n", __func__);
968 in6_dev_put(ifp->idev);
970 if (cancel_delayed_work(&ifp->dad_work))
971 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
974 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
975 pr_warn("Freeing alive inet6 address %p\n", ifp);
983 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
986 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
989 * Each device address list is sorted in order of scope -
990 * global before linklocal.
992 list_for_each(p, &idev->addr_list) {
993 struct inet6_ifaddr *ifa
994 = list_entry(p, struct inet6_ifaddr, if_list);
995 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
999 list_add_tail_rcu(&ifp->if_list, p);
1002 static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr)
1004 u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net);
1006 return hash_32(val, IN6_ADDR_HSIZE_SHIFT);
1009 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1010 struct net_device *dev, unsigned int hash)
1012 struct inet6_ifaddr *ifp;
1014 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1015 if (!net_eq(dev_net(ifp->idev->dev), net))
1017 if (ipv6_addr_equal(&ifp->addr, addr)) {
1018 if (!dev || ifp->idev->dev == dev)
1025 static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa)
1027 unsigned int hash = inet6_addr_hash(dev_net(dev), &ifa->addr);
1030 spin_lock(&addrconf_hash_lock);
1032 /* Ignore adding duplicate addresses on an interface */
1033 if (ipv6_chk_same_addr(dev_net(dev), &ifa->addr, dev, hash)) {
1034 netdev_dbg(dev, "ipv6_add_addr: already assigned\n");
1037 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
1040 spin_unlock(&addrconf_hash_lock);
1045 /* On success it returns ifp with increased reference count */
1047 static struct inet6_ifaddr *
1048 ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg,
1049 bool can_block, struct netlink_ext_ack *extack)
1051 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC;
1052 int addr_type = ipv6_addr_type(cfg->pfx);
1053 struct net *net = dev_net(idev->dev);
1054 struct inet6_ifaddr *ifa = NULL;
1055 struct fib6_info *f6i = NULL;
1058 if (addr_type == IPV6_ADDR_ANY ||
1059 (addr_type & IPV6_ADDR_MULTICAST &&
1060 !(cfg->ifa_flags & IFA_F_MCAUTOJOIN)) ||
1061 (!(idev->dev->flags & IFF_LOOPBACK) &&
1062 !netif_is_l3_master(idev->dev) &&
1063 addr_type & IPV6_ADDR_LOOPBACK))
1064 return ERR_PTR(-EADDRNOTAVAIL);
1067 err = -ENODEV; /*XXX*/
1071 if (idev->cnf.disable_ipv6) {
1076 /* validator notifier needs to be blocking;
1077 * do not call in atomic context
1080 struct in6_validator_info i6vi = {
1081 .i6vi_addr = *cfg->pfx,
1086 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi);
1087 err = notifier_to_errno(err);
1092 ifa = kzalloc(sizeof(*ifa), gfp_flags);
1098 f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags);
1105 neigh_parms_data_state_setall(idev->nd_parms);
1107 ifa->addr = *cfg->pfx;
1109 ifa->peer_addr = *cfg->peer_pfx;
1111 spin_lock_init(&ifa->lock);
1112 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
1113 INIT_HLIST_NODE(&ifa->addr_lst);
1114 ifa->scope = cfg->scope;
1115 ifa->prefix_len = cfg->plen;
1116 ifa->rt_priority = cfg->rt_priority;
1117 ifa->flags = cfg->ifa_flags;
1118 /* No need to add the TENTATIVE flag for addresses with NODAD */
1119 if (!(cfg->ifa_flags & IFA_F_NODAD))
1120 ifa->flags |= IFA_F_TENTATIVE;
1121 ifa->valid_lft = cfg->valid_lft;
1122 ifa->prefered_lft = cfg->preferred_lft;
1123 ifa->cstamp = ifa->tstamp = jiffies;
1124 ifa->tokenized = false;
1132 refcount_set(&ifa->refcnt, 1);
1136 err = ipv6_add_addr_hash(idev->dev, ifa);
1138 rcu_read_unlock_bh();
1142 write_lock(&idev->lock);
1144 /* Add to inet6_dev unicast addr list. */
1145 ipv6_link_dev_addr(idev, ifa);
1147 if (ifa->flags&IFA_F_TEMPORARY) {
1148 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1153 write_unlock(&idev->lock);
1155 rcu_read_unlock_bh();
1157 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1159 if (unlikely(err < 0)) {
1160 fib6_info_release(f6i);
1164 in6_dev_put(ifa->idev);
1173 enum cleanup_prefix_rt_t {
1174 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1175 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1176 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1180 * Check, whether the prefix for ifp would still need a prefix route
1181 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1184 * 1) we don't purge prefix if address was not permanent.
1185 * prefix is managed by its own lifetime.
1186 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1187 * 3) if there are no addresses, delete prefix.
1188 * 4) if there are still other permanent address(es),
1189 * corresponding prefix is still permanent.
1190 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1191 * don't purge the prefix, assume user space is managing it.
1192 * 6) otherwise, update prefix lifetime to the
1193 * longest valid lifetime among the corresponding
1194 * addresses on the device.
1195 * Note: subsequent RA will update lifetime.
1197 static enum cleanup_prefix_rt_t
1198 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1200 struct inet6_ifaddr *ifa;
1201 struct inet6_dev *idev = ifp->idev;
1202 unsigned long lifetime;
1203 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1207 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1210 if (ifa->prefix_len != ifp->prefix_len ||
1211 !ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1214 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1215 return CLEANUP_PREFIX_RT_NOP;
1217 action = CLEANUP_PREFIX_RT_EXPIRE;
1219 spin_lock(&ifa->lock);
1221 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1223 * Note: Because this address is
1224 * not permanent, lifetime <
1225 * LONG_MAX / HZ here.
1227 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1228 *expires = ifa->tstamp + lifetime * HZ;
1229 spin_unlock(&ifa->lock);
1236 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires,
1237 bool del_rt, bool del_peer)
1239 struct fib6_info *f6i;
1241 f6i = addrconf_get_prefix_route(del_peer ? &ifp->peer_addr : &ifp->addr,
1243 ifp->idev->dev, 0, RTF_DEFAULT, true);
1246 ip6_del_rt(dev_net(ifp->idev->dev), f6i);
1248 if (!(f6i->fib6_flags & RTF_EXPIRES))
1249 fib6_set_expires(f6i, expires);
1250 fib6_info_release(f6i);
1256 /* This function wants to get referenced ifp and releases it before return */
1258 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1261 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1262 unsigned long expires;
1266 spin_lock_bh(&ifp->lock);
1268 ifp->state = INET6_IFADDR_STATE_DEAD;
1269 spin_unlock_bh(&ifp->lock);
1271 if (state == INET6_IFADDR_STATE_DEAD)
1274 spin_lock_bh(&addrconf_hash_lock);
1275 hlist_del_init_rcu(&ifp->addr_lst);
1276 spin_unlock_bh(&addrconf_hash_lock);
1278 write_lock_bh(&ifp->idev->lock);
1280 if (ifp->flags&IFA_F_TEMPORARY) {
1281 list_del(&ifp->tmp_list);
1283 in6_ifa_put(ifp->ifpub);
1289 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1290 action = check_cleanup_prefix_route(ifp, &expires);
1292 list_del_rcu(&ifp->if_list);
1295 write_unlock_bh(&ifp->idev->lock);
1297 addrconf_del_dad_work(ifp);
1299 ipv6_ifa_notify(RTM_DELADDR, ifp);
1301 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1303 if (action != CLEANUP_PREFIX_RT_NOP) {
1304 cleanup_prefix_route(ifp, expires,
1305 action == CLEANUP_PREFIX_RT_DEL, false);
1308 /* clean up prefsrc entries */
1309 rt6_remove_prefsrc(ifp);
1314 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp,
1315 struct inet6_ifaddr *ift,
1318 struct inet6_dev *idev = ifp->idev;
1319 struct in6_addr addr, *tmpaddr;
1320 unsigned long tmp_tstamp, age;
1321 unsigned long regen_advance;
1322 struct ifa6_config cfg;
1324 unsigned long now = jiffies;
1325 long max_desync_factor;
1326 s32 cnf_temp_preferred_lft;
1328 write_lock_bh(&idev->lock);
1330 spin_lock_bh(&ift->lock);
1331 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1332 spin_unlock_bh(&ift->lock);
1339 if (idev->cnf.use_tempaddr <= 0) {
1340 write_unlock_bh(&idev->lock);
1341 pr_info("%s: use_tempaddr is disabled\n", __func__);
1346 spin_lock_bh(&ifp->lock);
1347 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1348 idev->cnf.use_tempaddr = -1; /*XXX*/
1349 spin_unlock_bh(&ifp->lock);
1350 write_unlock_bh(&idev->lock);
1351 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1358 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1359 ipv6_try_regen_rndid(idev, tmpaddr);
1360 memcpy(&addr.s6_addr[8], idev->rndid, 8);
1361 age = (now - ifp->tstamp) / HZ;
1363 regen_advance = idev->cnf.regen_max_retry *
1364 idev->cnf.dad_transmits *
1365 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1367 /* recalculate max_desync_factor each time and update
1368 * idev->desync_factor if it's larger
1370 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
1371 max_desync_factor = min_t(__u32,
1372 idev->cnf.max_desync_factor,
1373 cnf_temp_preferred_lft - regen_advance);
1375 if (unlikely(idev->desync_factor > max_desync_factor)) {
1376 if (max_desync_factor > 0) {
1377 get_random_bytes(&idev->desync_factor,
1378 sizeof(idev->desync_factor));
1379 idev->desync_factor %= max_desync_factor;
1381 idev->desync_factor = 0;
1385 memset(&cfg, 0, sizeof(cfg));
1386 cfg.valid_lft = min_t(__u32, ifp->valid_lft,
1387 idev->cnf.temp_valid_lft + age);
1388 cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor;
1389 cfg.preferred_lft = min_t(__u32, ifp->prefered_lft, cfg.preferred_lft);
1391 cfg.plen = ifp->prefix_len;
1392 tmp_tstamp = ifp->tstamp;
1393 spin_unlock_bh(&ifp->lock);
1395 write_unlock_bh(&idev->lock);
1397 /* A temporary address is created only if this calculated Preferred
1398 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1399 * an implementation must not create a temporary address with a zero
1400 * Preferred Lifetime.
1401 * Use age calculation as in addrconf_verify to avoid unnecessary
1402 * temporary addresses being generated.
1404 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1405 if (cfg.preferred_lft <= regen_advance + age) {
1412 cfg.ifa_flags = IFA_F_TEMPORARY;
1413 /* set in addrconf_prefix_rcv() */
1414 if (ifp->flags & IFA_F_OPTIMISTIC)
1415 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
1418 cfg.scope = ipv6_addr_scope(cfg.pfx);
1420 ift = ipv6_add_addr(idev, &cfg, block, NULL);
1424 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 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 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1913 const struct net_device *dev, bool skip_dev_check,
1914 int strict, u32 banned_flags)
1916 unsigned int hash = inet6_addr_hash(net, addr);
1917 const struct net_device *l3mdev;
1918 struct inet6_ifaddr *ifp;
1923 l3mdev = l3mdev_master_dev_rcu(dev);
1927 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1928 if (!net_eq(dev_net(ifp->idev->dev), net))
1931 if (l3mdev_master_dev_rcu(ifp->idev->dev) != l3mdev)
1934 /* Decouple optimistic from tentative for evaluation here.
1935 * Ban optimistic addresses explicitly, when required.
1937 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1938 ? (ifp->flags&~IFA_F_TENTATIVE)
1940 if (ipv6_addr_equal(&ifp->addr, addr) &&
1941 !(ifp_flags&banned_flags) &&
1942 (!dev || ifp->idev->dev == dev ||
1943 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1952 EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1955 /* Compares an address/prefix_len with addresses on device @dev.
1956 * If one is found it returns true.
1958 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1959 const unsigned int prefix_len, struct net_device *dev)
1961 const struct inet6_ifaddr *ifa;
1962 const struct inet6_dev *idev;
1966 idev = __in6_dev_get(dev);
1968 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
1969 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1978 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1980 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1982 const struct inet6_ifaddr *ifa;
1983 const struct inet6_dev *idev;
1988 idev = __in6_dev_get(dev);
1990 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
1991 onlink = ipv6_prefix_equal(addr, &ifa->addr,
2000 EXPORT_SYMBOL(ipv6_chk_prefix);
2002 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
2003 struct net_device *dev, int strict)
2005 unsigned int hash = inet6_addr_hash(net, addr);
2006 struct inet6_ifaddr *ifp, *result = NULL;
2009 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
2010 if (!net_eq(dev_net(ifp->idev->dev), net))
2012 if (ipv6_addr_equal(&ifp->addr, addr)) {
2013 if (!dev || ifp->idev->dev == dev ||
2014 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
2026 /* Gets referenced address, destroys ifaddr */
2028 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
2031 ifp->flags |= IFA_F_DADFAILED;
2033 if (ifp->flags&IFA_F_TEMPORARY) {
2034 struct inet6_ifaddr *ifpub;
2035 spin_lock_bh(&ifp->lock);
2038 in6_ifa_hold(ifpub);
2039 spin_unlock_bh(&ifp->lock);
2040 ipv6_create_tempaddr(ifpub, ifp, true);
2043 spin_unlock_bh(&ifp->lock);
2046 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) {
2047 spin_lock_bh(&ifp->lock);
2048 addrconf_del_dad_work(ifp);
2049 ifp->flags |= IFA_F_TENTATIVE;
2051 ifp->flags &= ~IFA_F_OPTIMISTIC;
2052 spin_unlock_bh(&ifp->lock);
2054 ipv6_ifa_notify(0, ifp);
2061 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
2065 spin_lock_bh(&ifp->lock);
2066 if (ifp->state == INET6_IFADDR_STATE_DAD) {
2067 ifp->state = INET6_IFADDR_STATE_POSTDAD;
2070 spin_unlock_bh(&ifp->lock);
2075 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp)
2077 struct inet6_dev *idev = ifp->idev;
2078 struct net *net = dev_net(ifp->idev->dev);
2080 if (addrconf_dad_end(ifp)) {
2085 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n",
2086 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source);
2088 spin_lock_bh(&ifp->lock);
2090 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
2091 struct in6_addr new_addr;
2092 struct inet6_ifaddr *ifp2;
2093 int retries = ifp->stable_privacy_retry + 1;
2094 struct ifa6_config cfg = {
2096 .plen = ifp->prefix_len,
2097 .ifa_flags = ifp->flags,
2098 .valid_lft = ifp->valid_lft,
2099 .preferred_lft = ifp->prefered_lft,
2100 .scope = ifp->scope,
2103 if (retries > net->ipv6.sysctl.idgen_retries) {
2104 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
2105 ifp->idev->dev->name);
2109 new_addr = ifp->addr;
2110 if (ipv6_generate_stable_address(&new_addr, retries,
2114 spin_unlock_bh(&ifp->lock);
2116 if (idev->cnf.max_addresses &&
2117 ipv6_count_addresses(idev) >=
2118 idev->cnf.max_addresses)
2121 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
2122 ifp->idev->dev->name);
2124 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL);
2128 spin_lock_bh(&ifp2->lock);
2129 ifp2->stable_privacy_retry = retries;
2130 ifp2->state = INET6_IFADDR_STATE_PREDAD;
2131 spin_unlock_bh(&ifp2->lock);
2133 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
2136 spin_lock_bh(&ifp->lock);
2140 /* transition from _POSTDAD to _ERRDAD */
2141 ifp->state = INET6_IFADDR_STATE_ERRDAD;
2142 spin_unlock_bh(&ifp->lock);
2144 addrconf_mod_dad_work(ifp, 0);
2148 /* Join to solicited addr multicast group.
2149 * caller must hold RTNL */
2150 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
2152 struct in6_addr maddr;
2154 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2157 addrconf_addr_solict_mult(addr, &maddr);
2158 ipv6_dev_mc_inc(dev, &maddr);
2161 /* caller must hold RTNL */
2162 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
2164 struct in6_addr maddr;
2166 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2169 addrconf_addr_solict_mult(addr, &maddr);
2170 __ipv6_dev_mc_dec(idev, &maddr);
2173 /* caller must hold RTNL */
2174 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
2176 struct in6_addr addr;
2178 if (ifp->prefix_len >= 127) /* RFC 6164 */
2180 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2181 if (ipv6_addr_any(&addr))
2183 __ipv6_dev_ac_inc(ifp->idev, &addr);
2186 /* caller must hold RTNL */
2187 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
2189 struct in6_addr addr;
2191 if (ifp->prefix_len >= 127) /* RFC 6164 */
2193 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2194 if (ipv6_addr_any(&addr))
2196 __ipv6_dev_ac_dec(ifp->idev, &addr);
2199 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev)
2201 switch (dev->addr_len) {
2203 memcpy(eui, dev->dev_addr, 3);
2206 memcpy(eui + 5, dev->dev_addr + 3, 3);
2208 case EUI64_ADDR_LEN:
2209 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2219 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2221 union fwnet_hwaddr *ha;
2223 if (dev->addr_len != FWNET_ALEN)
2226 ha = (union fwnet_hwaddr *)dev->dev_addr;
2228 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2233 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2235 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2236 if (dev->addr_len != ARCNET_ALEN)
2239 eui[7] = *(u8 *)dev->dev_addr;
2243 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2245 if (dev->addr_len != INFINIBAND_ALEN)
2247 memcpy(eui, dev->dev_addr + 12, 8);
2252 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
2256 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2257 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2258 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2259 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2260 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2261 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2265 memcpy(eui + 4, &addr, 4);
2269 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2271 if (dev->priv_flags & IFF_ISATAP)
2272 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2276 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2278 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2281 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2283 memcpy(eui, dev->perm_addr, 3);
2284 memcpy(eui + 5, dev->perm_addr + 3, 3);
2291 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2293 switch (dev->type) {
2296 return addrconf_ifid_eui48(eui, dev);
2298 return addrconf_ifid_arcnet(eui, dev);
2299 case ARPHRD_INFINIBAND:
2300 return addrconf_ifid_infiniband(eui, dev);
2302 return addrconf_ifid_sit(eui, dev);
2305 return addrconf_ifid_gre(eui, dev);
2306 case ARPHRD_6LOWPAN:
2307 return addrconf_ifid_6lowpan(eui, dev);
2308 case ARPHRD_IEEE1394:
2309 return addrconf_ifid_ieee1394(eui, dev);
2310 case ARPHRD_TUNNEL6:
2313 return addrconf_ifid_ip6tnl(eui, dev);
2318 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2321 struct inet6_ifaddr *ifp;
2323 read_lock_bh(&idev->lock);
2324 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2325 if (ifp->scope > IFA_LINK)
2327 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2328 memcpy(eui, ifp->addr.s6_addr+8, 8);
2333 read_unlock_bh(&idev->lock);
2337 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
2338 static void ipv6_regen_rndid(struct inet6_dev *idev)
2341 get_random_bytes(idev->rndid, sizeof(idev->rndid));
2342 idev->rndid[0] &= ~0x02;
2345 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2346 * check if generated address is not inappropriate
2348 * - Reserved subnet anycast (RFC 2526)
2349 * 11111101 11....11 1xxxxxxx
2350 * - ISATAP (RFC4214) 6.1
2351 * 00-00-5E-FE-xx-xx-xx-xx
2353 * - XXX: already assigned to an address on the device
2355 if (idev->rndid[0] == 0xfd &&
2356 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2357 (idev->rndid[7]&0x80))
2359 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2360 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2362 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2367 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
2369 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
2370 ipv6_regen_rndid(idev);
2378 addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric,
2379 struct net_device *dev, unsigned long expires,
2380 u32 flags, gfp_t gfp_flags)
2382 struct fib6_config cfg = {
2383 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
2384 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF,
2385 .fc_ifindex = dev->ifindex,
2386 .fc_expires = expires,
2388 .fc_flags = RTF_UP | flags,
2389 .fc_nlinfo.nl_net = dev_net(dev),
2390 .fc_protocol = RTPROT_KERNEL,
2391 .fc_type = RTN_UNICAST,
2396 /* Prevent useless cloning on PtP SIT.
2397 This thing is done here expecting that the whole
2398 class of non-broadcast devices need not cloning.
2400 #if IS_ENABLED(CONFIG_IPV6_SIT)
2401 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2402 cfg.fc_flags |= RTF_NONEXTHOP;
2405 ip6_route_add(&cfg, gfp_flags, NULL);
2409 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2411 const struct net_device *dev,
2412 u32 flags, u32 noflags,
2415 struct fib6_node *fn;
2416 struct fib6_info *rt = NULL;
2417 struct fib6_table *table;
2418 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
2420 table = fib6_get_table(dev_net(dev), tb_id);
2425 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true);
2429 for_each_fib6_node_rt_rcu(fn) {
2430 /* prefix routes only use builtin fib6_nh */
2434 if (rt->fib6_nh->fib_nh_dev->ifindex != dev->ifindex)
2436 if (no_gw && rt->fib6_nh->fib_nh_gw_family)
2438 if ((rt->fib6_flags & flags) != flags)
2440 if ((rt->fib6_flags & noflags) != 0)
2442 if (!fib6_info_hold_safe(rt))
2452 /* Create "default" multicast route to the interface */
2454 static void addrconf_add_mroute(struct net_device *dev)
2456 struct fib6_config cfg = {
2457 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2458 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2459 .fc_ifindex = dev->ifindex,
2462 .fc_type = RTN_MULTICAST,
2463 .fc_nlinfo.nl_net = dev_net(dev),
2464 .fc_protocol = RTPROT_KERNEL,
2467 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2469 ip6_route_add(&cfg, GFP_KERNEL, NULL);
2472 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2474 struct inet6_dev *idev;
2478 idev = ipv6_find_idev(dev);
2482 if (idev->cnf.disable_ipv6)
2483 return ERR_PTR(-EACCES);
2485 /* Add default multicast route */
2486 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
2487 addrconf_add_mroute(dev);
2492 static void manage_tempaddrs(struct inet6_dev *idev,
2493 struct inet6_ifaddr *ifp,
2494 __u32 valid_lft, __u32 prefered_lft,
2495 bool create, unsigned long now)
2498 struct inet6_ifaddr *ift;
2500 read_lock_bh(&idev->lock);
2501 /* update all temporary addresses in the list */
2502 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2503 int age, max_valid, max_prefered;
2505 if (ifp != ift->ifpub)
2508 /* RFC 4941 section 3.3:
2509 * If a received option will extend the lifetime of a public
2510 * address, the lifetimes of temporary addresses should
2511 * be extended, subject to the overall constraint that no
2512 * temporary addresses should ever remain "valid" or "preferred"
2513 * for a time longer than (TEMP_VALID_LIFETIME) or
2514 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2516 age = (now - ift->cstamp) / HZ;
2517 max_valid = idev->cnf.temp_valid_lft - age;
2521 max_prefered = idev->cnf.temp_prefered_lft -
2522 idev->desync_factor - age;
2523 if (max_prefered < 0)
2526 if (valid_lft > max_valid)
2527 valid_lft = max_valid;
2529 if (prefered_lft > max_prefered)
2530 prefered_lft = max_prefered;
2532 spin_lock(&ift->lock);
2534 ift->valid_lft = valid_lft;
2535 ift->prefered_lft = prefered_lft;
2537 if (prefered_lft > 0)
2538 ift->flags &= ~IFA_F_DEPRECATED;
2540 spin_unlock(&ift->lock);
2541 if (!(flags&IFA_F_TENTATIVE))
2542 ipv6_ifa_notify(0, ift);
2545 if ((create || list_empty(&idev->tempaddr_list)) &&
2546 idev->cnf.use_tempaddr > 0) {
2547 /* When a new public address is created as described
2548 * in [ADDRCONF], also create a new temporary address.
2549 * Also create a temporary address if it's enabled but
2550 * no temporary address currently exists.
2552 read_unlock_bh(&idev->lock);
2553 ipv6_create_tempaddr(ifp, NULL, false);
2555 read_unlock_bh(&idev->lock);
2559 static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2561 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2562 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2565 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2566 const struct prefix_info *pinfo,
2567 struct inet6_dev *in6_dev,
2568 const struct in6_addr *addr, int addr_type,
2569 u32 addr_flags, bool sllao, bool tokenized,
2570 __u32 valid_lft, u32 prefered_lft)
2572 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2573 int create = 0, update_lft = 0;
2575 if (!ifp && valid_lft) {
2576 int max_addresses = in6_dev->cnf.max_addresses;
2577 struct ifa6_config cfg = {
2579 .plen = pinfo->prefix_len,
2580 .ifa_flags = addr_flags,
2581 .valid_lft = valid_lft,
2582 .preferred_lft = prefered_lft,
2583 .scope = addr_type & IPV6_ADDR_SCOPE_MASK,
2586 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2587 if ((net->ipv6.devconf_all->optimistic_dad ||
2588 in6_dev->cnf.optimistic_dad) &&
2589 !net->ipv6.devconf_all->forwarding && sllao)
2590 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
2593 /* Do not allow to create too much of autoconfigured
2594 * addresses; this would be too easy way to crash kernel.
2596 if (!max_addresses ||
2597 ipv6_count_addresses(in6_dev) < max_addresses)
2598 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL);
2600 if (IS_ERR_OR_NULL(ifp))
2604 spin_lock_bh(&ifp->lock);
2605 ifp->flags |= IFA_F_MANAGETEMPADDR;
2606 ifp->cstamp = jiffies;
2607 ifp->tokenized = tokenized;
2608 spin_unlock_bh(&ifp->lock);
2609 addrconf_dad_start(ifp);
2617 /* update lifetime (RFC2462 5.5.3 e) */
2618 spin_lock_bh(&ifp->lock);
2620 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2621 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2624 if (!create && stored_lft) {
2625 const u32 minimum_lft = min_t(u32,
2626 stored_lft, MIN_VALID_LIFETIME);
2627 valid_lft = max(valid_lft, minimum_lft);
2629 /* RFC4862 Section 5.5.3e:
2630 * "Note that the preferred lifetime of the
2631 * corresponding address is always reset to
2632 * the Preferred Lifetime in the received
2633 * Prefix Information option, regardless of
2634 * whether the valid lifetime is also reset or
2637 * So we should always update prefered_lft here.
2643 ifp->valid_lft = valid_lft;
2644 ifp->prefered_lft = prefered_lft;
2647 ifp->flags &= ~IFA_F_DEPRECATED;
2648 spin_unlock_bh(&ifp->lock);
2650 if (!(flags&IFA_F_TENTATIVE))
2651 ipv6_ifa_notify(0, ifp);
2653 spin_unlock_bh(&ifp->lock);
2655 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2664 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
2666 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2668 struct prefix_info *pinfo;
2673 struct inet6_dev *in6_dev;
2674 struct net *net = dev_net(dev);
2676 pinfo = (struct prefix_info *) opt;
2678 if (len < sizeof(struct prefix_info)) {
2679 netdev_dbg(dev, "addrconf: prefix option too short\n");
2684 * Validation checks ([ADDRCONF], page 19)
2687 addr_type = ipv6_addr_type(&pinfo->prefix);
2689 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2692 valid_lft = ntohl(pinfo->valid);
2693 prefered_lft = ntohl(pinfo->prefered);
2695 if (prefered_lft > valid_lft) {
2696 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2700 in6_dev = in6_dev_get(dev);
2703 net_dbg_ratelimited("addrconf: device %s not configured\n",
2709 * Two things going on here:
2710 * 1) Add routes for on-link prefixes
2711 * 2) Configure prefixes with the auto flag set
2714 if (pinfo->onlink) {
2715 struct fib6_info *rt;
2716 unsigned long rt_expires;
2718 /* Avoid arithmetic overflow. Really, we could
2719 * save rt_expires in seconds, likely valid_lft,
2720 * but it would require division in fib gc, that it
2724 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2726 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2728 if (addrconf_finite_timeout(rt_expires))
2731 rt = addrconf_get_prefix_route(&pinfo->prefix,
2734 RTF_ADDRCONF | RTF_PREFIX_RT,
2738 /* Autoconf prefix route */
2739 if (valid_lft == 0) {
2740 ip6_del_rt(net, rt);
2742 } else if (addrconf_finite_timeout(rt_expires)) {
2744 fib6_set_expires(rt, jiffies + rt_expires);
2746 fib6_clean_expires(rt);
2748 } else if (valid_lft) {
2749 clock_t expires = 0;
2750 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2751 if (addrconf_finite_timeout(rt_expires)) {
2753 flags |= RTF_EXPIRES;
2754 expires = jiffies_to_clock_t(rt_expires);
2756 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2757 0, dev, expires, flags,
2760 fib6_info_release(rt);
2763 /* Try to figure out our local address for this prefix */
2765 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2766 struct in6_addr addr;
2767 bool tokenized = false, dev_addr_generated = false;
2769 if (pinfo->prefix_len == 64) {
2770 memcpy(&addr, &pinfo->prefix, 8);
2772 if (!ipv6_addr_any(&in6_dev->token)) {
2773 read_lock_bh(&in6_dev->lock);
2774 memcpy(addr.s6_addr + 8,
2775 in6_dev->token.s6_addr + 8, 8);
2776 read_unlock_bh(&in6_dev->lock);
2778 } else if (is_addr_mode_generate_stable(in6_dev) &&
2779 !ipv6_generate_stable_address(&addr, 0,
2781 addr_flags |= IFA_F_STABLE_PRIVACY;
2783 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2784 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2787 dev_addr_generated = true;
2791 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2796 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2799 tokenized, valid_lft,
2804 /* Ignore error case here because previous prefix add addr was
2805 * successful which will be notified.
2807 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2808 addr_type, addr_flags, sllao,
2809 tokenized, valid_lft,
2811 dev_addr_generated);
2813 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2815 in6_dev_put(in6_dev);
2819 * Set destination address.
2820 * Special case for SIT interfaces where we create a new "virtual"
2823 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2825 struct in6_ifreq ireq;
2826 struct net_device *dev;
2832 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2835 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2841 #if IS_ENABLED(CONFIG_IPV6_SIT)
2842 if (dev->type == ARPHRD_SIT) {
2843 const struct net_device_ops *ops = dev->netdev_ops;
2845 struct ip_tunnel_parm p;
2847 err = -EADDRNOTAVAIL;
2848 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2851 memset(&p, 0, sizeof(p));
2852 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2856 p.iph.protocol = IPPROTO_IPV6;
2858 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2860 if (ops->ndo_do_ioctl) {
2861 mm_segment_t oldfs = get_fs();
2864 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2871 dev = __dev_get_by_name(net, p.name);
2874 err = dev_open(dev, NULL);
2884 static int ipv6_mc_config(struct sock *sk, bool join,
2885 const struct in6_addr *addr, int ifindex)
2893 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2895 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2902 * Manual configuration of address on an interface
2904 static int inet6_addr_add(struct net *net, int ifindex,
2905 struct ifa6_config *cfg,
2906 struct netlink_ext_ack *extack)
2908 struct inet6_ifaddr *ifp;
2909 struct inet6_dev *idev;
2910 struct net_device *dev;
2911 unsigned long timeout;
2917 if (cfg->plen > 128)
2920 /* check the lifetime */
2921 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
2924 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64)
2927 dev = __dev_get_by_index(net, ifindex);
2931 idev = addrconf_add_dev(dev);
2933 return PTR_ERR(idev);
2935 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
2936 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2937 true, cfg->pfx, ifindex);
2943 cfg->scope = ipv6_addr_scope(cfg->pfx);
2945 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
2946 if (addrconf_finite_timeout(timeout)) {
2947 expires = jiffies_to_clock_t(timeout * HZ);
2948 cfg->valid_lft = timeout;
2949 flags = RTF_EXPIRES;
2953 cfg->ifa_flags |= IFA_F_PERMANENT;
2956 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
2957 if (addrconf_finite_timeout(timeout)) {
2959 cfg->ifa_flags |= IFA_F_DEPRECATED;
2960 cfg->preferred_lft = timeout;
2963 ifp = ipv6_add_addr(idev, cfg, true, extack);
2965 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
2966 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
2967 ifp->rt_priority, dev, expires,
2971 /* Send a netlink notification if DAD is enabled and
2972 * optimistic flag is not set
2974 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD)))
2975 ipv6_ifa_notify(0, ifp);
2977 * Note that section 3.1 of RFC 4429 indicates
2978 * that the Optimistic flag should not be set for
2979 * manually configured addresses
2981 addrconf_dad_start(ifp);
2982 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR)
2983 manage_tempaddrs(idev, ifp, cfg->valid_lft,
2984 cfg->preferred_lft, true, jiffies);
2986 addrconf_verify_rtnl();
2988 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
2989 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false,
2993 return PTR_ERR(ifp);
2996 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2997 const struct in6_addr *pfx, unsigned int plen)
2999 struct inet6_ifaddr *ifp;
3000 struct inet6_dev *idev;
3001 struct net_device *dev;
3006 dev = __dev_get_by_index(net, ifindex);
3010 idev = __in6_dev_get(dev);
3014 read_lock_bh(&idev->lock);
3015 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3016 if (ifp->prefix_len == plen &&
3017 ipv6_addr_equal(pfx, &ifp->addr)) {
3019 read_unlock_bh(&idev->lock);
3021 if (!(ifp->flags & IFA_F_TEMPORARY) &&
3022 (ifa_flags & IFA_F_MANAGETEMPADDR))
3023 manage_tempaddrs(idev, ifp, 0, 0, false,
3026 addrconf_verify_rtnl();
3027 if (ipv6_addr_is_multicast(pfx)) {
3028 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
3029 false, pfx, dev->ifindex);
3034 read_unlock_bh(&idev->lock);
3035 return -EADDRNOTAVAIL;
3039 int addrconf_add_ifaddr(struct net *net, void __user *arg)
3041 struct ifa6_config cfg = {
3042 .ifa_flags = IFA_F_PERMANENT,
3043 .preferred_lft = INFINITY_LIFE_TIME,
3044 .valid_lft = INFINITY_LIFE_TIME,
3046 struct in6_ifreq ireq;
3049 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3052 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3055 cfg.pfx = &ireq.ifr6_addr;
3056 cfg.plen = ireq.ifr6_prefixlen;
3059 err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL);
3064 int addrconf_del_ifaddr(struct net *net, void __user *arg)
3066 struct in6_ifreq ireq;
3069 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3072 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3076 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
3077 ireq.ifr6_prefixlen);
3082 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
3083 int plen, int scope)
3085 struct inet6_ifaddr *ifp;
3086 struct ifa6_config cfg = {
3089 .ifa_flags = IFA_F_PERMANENT,
3090 .valid_lft = INFINITY_LIFE_TIME,
3091 .preferred_lft = INFINITY_LIFE_TIME,
3095 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
3097 spin_lock_bh(&ifp->lock);
3098 ifp->flags &= ~IFA_F_TENTATIVE;
3099 spin_unlock_bh(&ifp->lock);
3100 rt_genid_bump_ipv6(dev_net(idev->dev));
3101 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3106 #if IS_ENABLED(CONFIG_IPV6_SIT)
3107 static void sit_add_v4_addrs(struct inet6_dev *idev)
3109 struct in6_addr addr;
3110 struct net_device *dev;
3111 struct net *net = dev_net(idev->dev);
3117 memset(&addr, 0, sizeof(struct in6_addr));
3118 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
3120 if (idev->dev->flags&IFF_POINTOPOINT) {
3121 if (idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_NONE)
3124 addr.s6_addr32[0] = htonl(0xfe800000);
3128 scope = IPV6_ADDR_COMPATv4;
3130 pflags |= RTF_NONEXTHOP;
3133 if (addr.s6_addr32[3]) {
3134 add_addr(idev, &addr, plen, scope);
3135 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags,
3140 for_each_netdev(net, dev) {
3141 struct in_device *in_dev = __in_dev_get_rtnl(dev);
3142 if (in_dev && (dev->flags & IFF_UP)) {
3143 struct in_ifaddr *ifa;
3146 in_dev_for_each_ifa_rtnl(ifa, in_dev) {
3147 addr.s6_addr32[3] = ifa->ifa_local;
3149 if (ifa->ifa_scope == RT_SCOPE_LINK)
3151 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
3152 if (idev->dev->flags&IFF_POINTOPOINT)
3157 add_addr(idev, &addr, plen, flag);
3158 addrconf_prefix_route(&addr, plen, 0, idev->dev,
3159 0, pflags, GFP_KERNEL);
3166 static void init_loopback(struct net_device *dev)
3168 struct inet6_dev *idev;
3174 idev = ipv6_find_idev(dev);
3176 pr_debug("%s: add_dev failed\n", __func__);
3180 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
3183 void addrconf_add_linklocal(struct inet6_dev *idev,
3184 const struct in6_addr *addr, u32 flags)
3186 struct ifa6_config cfg = {
3189 .ifa_flags = flags | IFA_F_PERMANENT,
3190 .valid_lft = INFINITY_LIFE_TIME,
3191 .preferred_lft = INFINITY_LIFE_TIME,
3194 struct inet6_ifaddr *ifp;
3196 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3197 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad ||
3198 idev->cnf.optimistic_dad) &&
3199 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
3200 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
3203 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
3205 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev,
3207 addrconf_dad_start(ifp);
3211 EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
3213 static bool ipv6_reserved_interfaceid(struct in6_addr address)
3215 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3218 if (address.s6_addr32[2] == htonl(0x02005eff) &&
3219 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3222 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3223 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3229 static int ipv6_generate_stable_address(struct in6_addr *address,
3231 const struct inet6_dev *idev)
3233 static DEFINE_SPINLOCK(lock);
3234 static __u32 digest[SHA_DIGEST_WORDS];
3235 static __u32 workspace[SHA_WORKSPACE_WORDS];
3238 char __data[SHA_MESSAGE_BYTES];
3240 struct in6_addr secret;
3242 unsigned char hwaddr[MAX_ADDR_LEN];
3247 struct in6_addr secret;
3248 struct in6_addr temp;
3249 struct net *net = dev_net(idev->dev);
3251 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3253 if (idev->cnf.stable_secret.initialized)
3254 secret = idev->cnf.stable_secret.secret;
3255 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3256 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3261 spin_lock_bh(&lock);
3264 memset(&data, 0, sizeof(data));
3265 memset(workspace, 0, sizeof(workspace));
3266 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3267 data.prefix[0] = address->s6_addr32[0];
3268 data.prefix[1] = address->s6_addr32[1];
3269 data.secret = secret;
3270 data.dad_count = dad_count;
3272 sha_transform(digest, data.__data, workspace);
3275 temp.s6_addr32[2] = (__force __be32)digest[0];
3276 temp.s6_addr32[3] = (__force __be32)digest[1];
3278 spin_unlock_bh(&lock);
3280 if (ipv6_reserved_interfaceid(temp)) {
3282 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3291 static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3293 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3297 s = &idev->cnf.stable_secret;
3298 get_random_bytes(&s->secret, sizeof(s->secret));
3299 s->initialized = true;
3302 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3304 struct in6_addr addr;
3306 /* no link local addresses on L3 master devices */
3307 if (netif_is_l3_master(idev->dev))
3310 /* no link local addresses on devices flagged as slaves */
3311 if (idev->dev->flags & IFF_SLAVE)
3314 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3316 switch (idev->cnf.addr_gen_mode) {
3317 case IN6_ADDR_GEN_MODE_RANDOM:
3318 ipv6_gen_mode_random_init(idev);
3320 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
3321 if (!ipv6_generate_stable_address(&addr, 0, idev))
3322 addrconf_add_linklocal(idev, &addr,
3323 IFA_F_STABLE_PRIVACY);
3324 else if (prefix_route)
3325 addrconf_prefix_route(&addr, 64, 0, idev->dev,
3328 case IN6_ADDR_GEN_MODE_EUI64:
3329 /* addrconf_add_linklocal also adds a prefix_route and we
3330 * only need to care about prefix routes if ipv6_generate_eui64
3331 * couldn't generate one.
3333 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3334 addrconf_add_linklocal(idev, &addr, 0);
3335 else if (prefix_route)
3336 addrconf_prefix_route(&addr, 64, 0, idev->dev,
3339 case IN6_ADDR_GEN_MODE_NONE:
3341 /* will not add any link local address */
3346 static void addrconf_dev_config(struct net_device *dev)
3348 struct inet6_dev *idev;
3352 if ((dev->type != ARPHRD_ETHER) &&
3353 (dev->type != ARPHRD_FDDI) &&
3354 (dev->type != ARPHRD_ARCNET) &&
3355 (dev->type != ARPHRD_INFINIBAND) &&
3356 (dev->type != ARPHRD_IEEE1394) &&
3357 (dev->type != ARPHRD_TUNNEL6) &&
3358 (dev->type != ARPHRD_6LOWPAN) &&
3359 (dev->type != ARPHRD_IP6GRE) &&
3360 (dev->type != ARPHRD_IPGRE) &&
3361 (dev->type != ARPHRD_TUNNEL) &&
3362 (dev->type != ARPHRD_NONE) &&
3363 (dev->type != ARPHRD_RAWIP)) {
3364 /* Alas, we support only Ethernet autoconfiguration. */
3365 idev = __in6_dev_get(dev);
3366 if (!IS_ERR_OR_NULL(idev) && dev->flags & IFF_UP &&
3367 dev->flags & IFF_MULTICAST)
3372 idev = addrconf_add_dev(dev);
3376 /* this device type has no EUI support */
3377 if (dev->type == ARPHRD_NONE &&
3378 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3379 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
3381 addrconf_addr_gen(idev, false);
3384 #if IS_ENABLED(CONFIG_IPV6_SIT)
3385 static void addrconf_sit_config(struct net_device *dev)
3387 struct inet6_dev *idev;
3392 * Configure the tunnel with one of our IPv4
3393 * addresses... we should configure all of
3394 * our v4 addrs in the tunnel
3397 idev = ipv6_find_idev(dev);
3399 pr_debug("%s: add_dev failed\n", __func__);
3403 if (dev->priv_flags & IFF_ISATAP) {
3404 addrconf_addr_gen(idev, false);
3408 sit_add_v4_addrs(idev);
3410 if (dev->flags&IFF_POINTOPOINT)
3411 addrconf_add_mroute(dev);
3415 #if IS_ENABLED(CONFIG_NET_IPGRE)
3416 static void addrconf_gre_config(struct net_device *dev)
3418 struct inet6_dev *idev;
3422 idev = ipv6_find_idev(dev);
3424 pr_debug("%s: add_dev failed\n", __func__);
3428 addrconf_addr_gen(idev, true);
3429 if (dev->flags & IFF_POINTOPOINT)
3430 addrconf_add_mroute(dev);
3434 static int fixup_permanent_addr(struct net *net,
3435 struct inet6_dev *idev,
3436 struct inet6_ifaddr *ifp)
3438 /* !fib6_node means the host route was removed from the
3439 * FIB, for example, if 'lo' device is taken down. In that
3440 * case regenerate the host route.
3442 if (!ifp->rt || !ifp->rt->fib6_node) {
3443 struct fib6_info *f6i, *prev;
3445 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false,
3448 return PTR_ERR(f6i);
3450 /* ifp->rt can be accessed outside of rtnl */
3451 spin_lock(&ifp->lock);
3454 spin_unlock(&ifp->lock);
3456 fib6_info_release(prev);
3459 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3460 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3461 ifp->rt_priority, idev->dev, 0, 0,
3465 if (ifp->state == INET6_IFADDR_STATE_PREDAD)
3466 addrconf_dad_start(ifp);
3471 static void addrconf_permanent_addr(struct net *net, struct net_device *dev)
3473 struct inet6_ifaddr *ifp, *tmp;
3474 struct inet6_dev *idev;
3476 idev = __in6_dev_get(dev);
3480 write_lock_bh(&idev->lock);
3482 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3483 if ((ifp->flags & IFA_F_PERMANENT) &&
3484 fixup_permanent_addr(net, idev, ifp) < 0) {
3485 write_unlock_bh(&idev->lock);
3488 write_lock_bh(&idev->lock);
3490 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3491 idev->dev->name, &ifp->addr);
3495 write_unlock_bh(&idev->lock);
3498 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3501 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3502 struct netdev_notifier_change_info *change_info;
3503 struct netdev_notifier_changeupper_info *info;
3504 struct inet6_dev *idev = __in6_dev_get(dev);
3505 struct net *net = dev_net(dev);
3506 int run_pending = 0;
3510 case NETDEV_REGISTER:
3511 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3512 idev = ipv6_add_dev(dev);
3514 return notifier_from_errno(PTR_ERR(idev));
3518 case NETDEV_CHANGEMTU:
3519 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3520 if (dev->mtu < IPV6_MIN_MTU) {
3521 addrconf_ifdown(dev, dev != net->loopback_dev);
3526 rt6_mtu_change(dev, dev->mtu);
3527 idev->cnf.mtu6 = dev->mtu;
3531 /* allocate new idev */
3532 idev = ipv6_add_dev(dev);
3536 /* device is still not ready */
3537 if (!(idev->if_flags & IF_READY))
3546 if (dev->flags & IFF_SLAVE)
3549 if (idev && idev->cnf.disable_ipv6)
3552 if (event == NETDEV_UP) {
3553 /* restore routes for permanent addresses */
3554 addrconf_permanent_addr(net, dev);
3556 if (!addrconf_link_ready(dev)) {
3557 /* device is not ready yet. */
3558 pr_debug("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3563 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3564 idev = ipv6_add_dev(dev);
3566 if (!IS_ERR_OR_NULL(idev)) {
3567 idev->if_flags |= IF_READY;
3570 } else if (event == NETDEV_CHANGE) {
3571 if (!addrconf_link_ready(dev)) {
3572 /* device is still not ready. */
3573 rt6_sync_down_dev(dev, event);
3577 if (!IS_ERR_OR_NULL(idev)) {
3578 if (idev->if_flags & IF_READY) {
3579 /* device is already configured -
3580 * but resend MLD reports, we might
3581 * have roamed and need to update
3582 * multicast snooping switches
3586 if (change_info->flags_changed & IFF_NOARP)
3587 addrconf_dad_run(idev, true);
3588 rt6_sync_up(dev, RTNH_F_LINKDOWN);
3591 idev->if_flags |= IF_READY;
3594 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3600 switch (dev->type) {
3601 #if IS_ENABLED(CONFIG_IPV6_SIT)
3603 addrconf_sit_config(dev);
3606 #if IS_ENABLED(CONFIG_NET_IPGRE)
3608 addrconf_gre_config(dev);
3611 case ARPHRD_LOOPBACK:
3616 addrconf_dev_config(dev);
3620 if (!IS_ERR_OR_NULL(idev)) {
3622 addrconf_dad_run(idev, false);
3624 /* Device has an address by now */
3625 rt6_sync_up(dev, RTNH_F_DEAD);
3628 * If the MTU changed during the interface down,
3629 * when the interface up, the changed MTU must be
3630 * reflected in the idev as well as routers.
3632 if (idev->cnf.mtu6 != dev->mtu &&
3633 dev->mtu >= IPV6_MIN_MTU) {
3634 rt6_mtu_change(dev, dev->mtu);
3635 idev->cnf.mtu6 = dev->mtu;
3637 idev->tstamp = jiffies;
3638 inet6_ifinfo_notify(RTM_NEWLINK, idev);
3641 * If the changed mtu during down is lower than
3642 * IPV6_MIN_MTU stop IPv6 on this interface.
3644 if (dev->mtu < IPV6_MIN_MTU)
3645 addrconf_ifdown(dev, dev != net->loopback_dev);
3650 case NETDEV_UNREGISTER:
3652 * Remove all addresses from this interface.
3654 addrconf_ifdown(dev, event != NETDEV_DOWN);
3657 case NETDEV_CHANGENAME:
3659 snmp6_unregister_dev(idev);
3660 addrconf_sysctl_unregister(idev);
3661 err = addrconf_sysctl_register(idev);
3663 return notifier_from_errno(err);
3664 err = snmp6_register_dev(idev);
3666 addrconf_sysctl_unregister(idev);
3667 return notifier_from_errno(err);
3672 case NETDEV_PRE_TYPE_CHANGE:
3673 case NETDEV_POST_TYPE_CHANGE:
3675 addrconf_type_change(dev, event);
3678 case NETDEV_CHANGEUPPER:
3681 /* flush all routes if dev is linked to or unlinked from
3682 * an L3 master device (e.g., VRF)
3684 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3685 addrconf_ifdown(dev, 0);
3692 * addrconf module should be notified of a device going up
3694 static struct notifier_block ipv6_dev_notf = {
3695 .notifier_call = addrconf_notify,
3696 .priority = ADDRCONF_NOTIFY_PRIORITY,
3699 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3701 struct inet6_dev *idev;
3704 idev = __in6_dev_get(dev);
3706 if (event == NETDEV_POST_TYPE_CHANGE)
3707 ipv6_mc_remap(idev);
3708 else if (event == NETDEV_PRE_TYPE_CHANGE)
3709 ipv6_mc_unmap(idev);
3712 static bool addr_is_local(const struct in6_addr *addr)
3714 return ipv6_addr_type(addr) &
3715 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3718 static int addrconf_ifdown(struct net_device *dev, int how)
3720 unsigned long event = how ? NETDEV_UNREGISTER : NETDEV_DOWN;
3721 struct net *net = dev_net(dev);
3722 struct inet6_dev *idev;
3723 struct inet6_ifaddr *ifa;
3724 LIST_HEAD(tmp_addr_list);
3725 bool keep_addr = false;
3731 rt6_disable_ip(dev, event);
3733 idev = __in6_dev_get(dev);
3738 * Step 1: remove reference to ipv6 device from parent device.
3744 /* protected by rtnl_lock */
3745 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3747 /* Step 1.5: remove snmp6 entry */
3748 snmp6_unregister_dev(idev);
3752 /* combine the user config with event to determine if permanent
3753 * addresses are to be removed from address hash table
3755 if (!how && !idev->cnf.disable_ipv6) {
3756 /* aggregate the system setting and interface setting */
3757 int _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3760 _keep_addr = idev->cnf.keep_addr_on_down;
3762 keep_addr = (_keep_addr > 0);
3765 /* Step 2: clear hash table */
3766 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3767 struct hlist_head *h = &inet6_addr_lst[i];
3769 spin_lock_bh(&addrconf_hash_lock);
3771 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3772 if (ifa->idev == idev) {
3773 addrconf_del_dad_work(ifa);
3774 /* combined flag + permanent flag decide if
3775 * address is retained on a down event
3778 !(ifa->flags & IFA_F_PERMANENT) ||
3779 addr_is_local(&ifa->addr)) {
3780 hlist_del_init_rcu(&ifa->addr_lst);
3785 spin_unlock_bh(&addrconf_hash_lock);
3788 write_lock_bh(&idev->lock);
3790 addrconf_del_rs_timer(idev);
3792 /* Step 2: clear flags for stateless addrconf, repeated down
3795 was_ready = idev->if_flags & IF_READY;
3797 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3799 /* Step 3: clear tempaddr list */
3800 while (!list_empty(&idev->tempaddr_list)) {
3801 ifa = list_first_entry(&idev->tempaddr_list,
3802 struct inet6_ifaddr, tmp_list);
3803 list_del(&ifa->tmp_list);
3804 write_unlock_bh(&idev->lock);
3805 spin_lock_bh(&ifa->lock);
3808 in6_ifa_put(ifa->ifpub);
3811 spin_unlock_bh(&ifa->lock);
3813 write_lock_bh(&idev->lock);
3816 list_for_each_entry(ifa, &idev->addr_list, if_list)
3817 list_add_tail(&ifa->if_list_aux, &tmp_addr_list);
3818 write_unlock_bh(&idev->lock);
3820 while (!list_empty(&tmp_addr_list)) {
3821 struct fib6_info *rt = NULL;
3824 ifa = list_first_entry(&tmp_addr_list,
3825 struct inet6_ifaddr, if_list_aux);
3826 list_del(&ifa->if_list_aux);
3828 addrconf_del_dad_work(ifa);
3830 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3831 !addr_is_local(&ifa->addr);
3833 spin_lock_bh(&ifa->lock);
3836 /* set state to skip the notifier below */
3837 state = INET6_IFADDR_STATE_DEAD;
3838 ifa->state = INET6_IFADDR_STATE_PREDAD;
3839 if (!(ifa->flags & IFA_F_NODAD))
3840 ifa->flags |= IFA_F_TENTATIVE;
3846 ifa->state = INET6_IFADDR_STATE_DEAD;
3849 spin_unlock_bh(&ifa->lock);
3852 ip6_del_rt(net, rt);
3854 if (state != INET6_IFADDR_STATE_DEAD) {
3855 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3856 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3858 if (idev->cnf.forwarding)
3859 addrconf_leave_anycast(ifa);
3860 addrconf_leave_solict(ifa->idev, &ifa->addr);
3864 write_lock_bh(&idev->lock);
3865 list_del_rcu(&ifa->if_list);
3866 write_unlock_bh(&idev->lock);
3871 /* Step 5: Discard anycast and multicast list */
3873 ipv6_ac_destroy_dev(idev);
3874 ipv6_mc_destroy_dev(idev);
3875 } else if (was_ready) {
3879 idev->tstamp = jiffies;
3881 /* Last: Shot the device (if unregistered) */
3883 addrconf_sysctl_unregister(idev);
3884 neigh_parms_release(&nd_tbl, idev->nd_parms);
3885 neigh_ifdown(&nd_tbl, dev);
3891 static void addrconf_rs_timer(struct timer_list *t)
3893 struct inet6_dev *idev = from_timer(idev, t, rs_timer);
3894 struct net_device *dev = idev->dev;
3895 struct in6_addr lladdr;
3897 write_lock(&idev->lock);
3898 if (idev->dead || !(idev->if_flags & IF_READY))
3901 if (!ipv6_accept_ra(idev))
3904 /* Announcement received after solicitation was sent */
3905 if (idev->if_flags & IF_RA_RCVD)
3908 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
3909 write_unlock(&idev->lock);
3910 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3911 ndisc_send_rs(dev, &lladdr,
3912 &in6addr_linklocal_allrouters);
3916 write_lock(&idev->lock);
3917 idev->rs_interval = rfc3315_s14_backoff_update(
3918 idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
3919 /* The wait after the last probe can be shorter */
3920 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3921 idev->cnf.rtr_solicits) ?
3922 idev->cnf.rtr_solicit_delay :
3926 * Note: we do not support deprecated "all on-link"
3927 * assumption any longer.
3929 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3933 write_unlock(&idev->lock);
3939 * Duplicate Address Detection
3941 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3943 unsigned long rand_num;
3944 struct inet6_dev *idev = ifp->idev;
3947 if (ifp->flags & IFA_F_OPTIMISTIC)
3950 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3953 if (idev->cnf.enhanced_dad ||
3954 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) {
3956 get_random_bytes(&nonce, 6);
3959 ifp->dad_nonce = nonce;
3960 ifp->dad_probes = idev->cnf.dad_transmits;
3961 addrconf_mod_dad_work(ifp, rand_num);
3964 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3966 struct inet6_dev *idev = ifp->idev;
3967 struct net_device *dev = idev->dev;
3968 bool bump_id, notify = false;
3971 addrconf_join_solict(dev, &ifp->addr);
3973 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3975 read_lock_bh(&idev->lock);
3976 spin_lock(&ifp->lock);
3977 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3981 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3982 (net->ipv6.devconf_all->accept_dad < 1 &&
3983 idev->cnf.accept_dad < 1) ||
3984 !(ifp->flags&IFA_F_TENTATIVE) ||
3985 ifp->flags & IFA_F_NODAD) {
3986 bool send_na = false;
3988 if (ifp->flags & IFA_F_TENTATIVE &&
3989 !(ifp->flags & IFA_F_OPTIMISTIC))
3991 bump_id = ifp->flags & IFA_F_TENTATIVE;
3992 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3993 spin_unlock(&ifp->lock);
3994 read_unlock_bh(&idev->lock);
3996 addrconf_dad_completed(ifp, bump_id, send_na);
4000 if (!(idev->if_flags & IF_READY)) {
4001 spin_unlock(&ifp->lock);
4002 read_unlock_bh(&idev->lock);
4004 * If the device is not ready:
4005 * - keep it tentative if it is a permanent address.
4006 * - otherwise, kill it.
4009 addrconf_dad_stop(ifp, 0);
4014 * Optimistic nodes can start receiving
4017 if (ifp->flags & IFA_F_OPTIMISTIC) {
4018 ip6_ins_rt(net, ifp->rt);
4019 if (ipv6_use_optimistic_addr(net, idev)) {
4020 /* Because optimistic nodes can use this address,
4021 * notify listeners. If DAD fails, RTM_DELADDR is sent.
4027 addrconf_dad_kick(ifp);
4029 spin_unlock(&ifp->lock);
4030 read_unlock_bh(&idev->lock);
4032 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4035 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
4037 bool begin_dad = false;
4039 spin_lock_bh(&ifp->lock);
4040 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
4041 ifp->state = INET6_IFADDR_STATE_PREDAD;
4044 spin_unlock_bh(&ifp->lock);
4047 addrconf_mod_dad_work(ifp, 0);
4050 static void addrconf_dad_work(struct work_struct *w)
4052 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
4053 struct inet6_ifaddr,
4055 struct inet6_dev *idev = ifp->idev;
4056 bool bump_id, disable_ipv6 = false;
4057 struct in6_addr mcaddr;
4063 } action = DAD_PROCESS;
4067 spin_lock_bh(&ifp->lock);
4068 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
4070 ifp->state = INET6_IFADDR_STATE_DAD;
4071 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
4073 ifp->state = INET6_IFADDR_STATE_POSTDAD;
4075 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 ||
4076 idev->cnf.accept_dad > 1) &&
4077 !idev->cnf.disable_ipv6 &&
4078 !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
4079 struct in6_addr addr;
4081 addr.s6_addr32[0] = htonl(0xfe800000);
4082 addr.s6_addr32[1] = 0;
4084 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
4085 ipv6_addr_equal(&ifp->addr, &addr)) {
4086 /* DAD failed for link-local based on MAC */
4087 idev->cnf.disable_ipv6 = 1;
4089 pr_info("%s: IPv6 being disabled!\n",
4090 ifp->idev->dev->name);
4091 disable_ipv6 = true;
4095 spin_unlock_bh(&ifp->lock);
4097 if (action == DAD_BEGIN) {
4098 addrconf_dad_begin(ifp);
4100 } else if (action == DAD_ABORT) {
4102 addrconf_dad_stop(ifp, 1);
4104 addrconf_ifdown(idev->dev, 0);
4108 if (!ifp->dad_probes && addrconf_dad_end(ifp))
4111 write_lock_bh(&idev->lock);
4112 if (idev->dead || !(idev->if_flags & IF_READY)) {
4113 write_unlock_bh(&idev->lock);
4117 spin_lock(&ifp->lock);
4118 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
4119 spin_unlock(&ifp->lock);
4120 write_unlock_bh(&idev->lock);
4124 if (ifp->dad_probes == 0) {
4125 bool send_na = false;
4128 * DAD was successful
4131 if (ifp->flags & IFA_F_TENTATIVE &&
4132 !(ifp->flags & IFA_F_OPTIMISTIC))
4134 bump_id = ifp->flags & IFA_F_TENTATIVE;
4135 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
4136 spin_unlock(&ifp->lock);
4137 write_unlock_bh(&idev->lock);
4139 addrconf_dad_completed(ifp, bump_id, send_na);
4145 addrconf_mod_dad_work(ifp,
4146 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
4147 spin_unlock(&ifp->lock);
4148 write_unlock_bh(&idev->lock);
4150 /* send a neighbour solicitation for our addr */
4151 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
4152 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
4159 /* ifp->idev must be at least read locked */
4160 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
4162 struct inet6_ifaddr *ifpiter;
4163 struct inet6_dev *idev = ifp->idev;
4165 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
4166 if (ifpiter->scope > IFA_LINK)
4168 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
4169 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
4170 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
4177 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
4180 struct net_device *dev = ifp->idev->dev;
4181 struct in6_addr lladdr;
4182 bool send_rs, send_mld;
4184 addrconf_del_dad_work(ifp);
4187 * Configure the address for reception. Now it is valid.
4190 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4192 /* If added prefix is link local and we are prepared to process
4193 router advertisements, start sending router solicitations.
4196 read_lock_bh(&ifp->idev->lock);
4197 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
4198 send_rs = send_mld &&
4199 ipv6_accept_ra(ifp->idev) &&
4200 ifp->idev->cnf.rtr_solicits != 0 &&
4201 (dev->flags & IFF_LOOPBACK) == 0 &&
4202 (dev->type != ARPHRD_TUNNEL);
4203 read_unlock_bh(&ifp->idev->lock);
4205 /* While dad is in progress mld report's source address is in6_addrany.
4206 * Resend with proper ll now.
4209 ipv6_mc_dad_complete(ifp->idev);
4211 /* send unsolicited NA if enabled */
4213 (ifp->idev->cnf.ndisc_notify ||
4214 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) {
4215 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr,
4216 /*router=*/ !!ifp->idev->cnf.forwarding,
4217 /*solicited=*/ false, /*override=*/ true,
4223 * If a host as already performed a random delay
4224 * [...] as part of DAD [...] there is no need
4225 * to delay again before sending the first RS
4227 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
4229 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
4231 write_lock_bh(&ifp->idev->lock);
4232 spin_lock(&ifp->lock);
4233 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4234 ifp->idev->cnf.rtr_solicit_interval);
4235 ifp->idev->rs_probes = 1;
4236 ifp->idev->if_flags |= IF_RS_SENT;
4237 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
4238 spin_unlock(&ifp->lock);
4239 write_unlock_bh(&ifp->idev->lock);
4243 rt_genid_bump_ipv6(dev_net(dev));
4245 /* Make sure that a new temporary address will be created
4246 * before this temporary address becomes deprecated.
4248 if (ifp->flags & IFA_F_TEMPORARY)
4249 addrconf_verify_rtnl();
4252 static void addrconf_dad_run(struct inet6_dev *idev, bool restart)
4254 struct inet6_ifaddr *ifp;
4256 read_lock_bh(&idev->lock);
4257 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4258 spin_lock(&ifp->lock);
4259 if ((ifp->flags & IFA_F_TENTATIVE &&
4260 ifp->state == INET6_IFADDR_STATE_DAD) || restart) {
4262 ifp->state = INET6_IFADDR_STATE_PREDAD;
4263 addrconf_dad_kick(ifp);
4265 spin_unlock(&ifp->lock);
4267 read_unlock_bh(&idev->lock);
4270 #ifdef CONFIG_PROC_FS
4271 struct if6_iter_state {
4272 struct seq_net_private p;
4277 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
4279 struct if6_iter_state *state = seq->private;
4280 struct net *net = seq_file_net(seq);
4281 struct inet6_ifaddr *ifa = NULL;
4284 /* initial bucket if pos is 0 */
4290 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
4291 hlist_for_each_entry_rcu(ifa, &inet6_addr_lst[state->bucket],
4293 if (!net_eq(dev_net(ifa->idev->dev), net))
4295 /* sync with offset */
4296 if (p < state->offset) {
4303 /* prepare for next bucket */
4310 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4311 struct inet6_ifaddr *ifa)
4313 struct if6_iter_state *state = seq->private;
4314 struct net *net = seq_file_net(seq);
4316 hlist_for_each_entry_continue_rcu(ifa, addr_lst) {
4317 if (!net_eq(dev_net(ifa->idev->dev), net))
4324 while (++state->bucket < IN6_ADDR_HSIZE) {
4325 hlist_for_each_entry_rcu(ifa,
4326 &inet6_addr_lst[state->bucket], addr_lst) {
4327 if (!net_eq(dev_net(ifa->idev->dev), net))
4336 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4340 return if6_get_first(seq, *pos);
4343 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4345 struct inet6_ifaddr *ifa;
4347 ifa = if6_get_next(seq, v);
4352 static void if6_seq_stop(struct seq_file *seq, void *v)
4358 static int if6_seq_show(struct seq_file *seq, void *v)
4360 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4361 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
4363 ifp->idev->dev->ifindex,
4367 ifp->idev->dev->name);
4371 static const struct seq_operations if6_seq_ops = {
4372 .start = if6_seq_start,
4373 .next = if6_seq_next,
4374 .show = if6_seq_show,
4375 .stop = if6_seq_stop,
4378 static int __net_init if6_proc_net_init(struct net *net)
4380 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops,
4381 sizeof(struct if6_iter_state)))
4386 static void __net_exit if6_proc_net_exit(struct net *net)
4388 remove_proc_entry("if_inet6", net->proc_net);
4391 static struct pernet_operations if6_proc_net_ops = {
4392 .init = if6_proc_net_init,
4393 .exit = if6_proc_net_exit,
4396 int __init if6_proc_init(void)
4398 return register_pernet_subsys(&if6_proc_net_ops);
4401 void if6_proc_exit(void)
4403 unregister_pernet_subsys(&if6_proc_net_ops);
4405 #endif /* CONFIG_PROC_FS */
4407 #if IS_ENABLED(CONFIG_IPV6_MIP6)
4408 /* Check if address is a home address configured on any interface. */
4409 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
4411 unsigned int hash = inet6_addr_hash(net, addr);
4412 struct inet6_ifaddr *ifp = NULL;
4416 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
4417 if (!net_eq(dev_net(ifp->idev->dev), net))
4419 if (ipv6_addr_equal(&ifp->addr, addr) &&
4420 (ifp->flags & IFA_F_HOMEADDRESS)) {
4431 * Periodic address status verification
4434 static void addrconf_verify_rtnl(void)
4436 unsigned long now, next, next_sec, next_sched;
4437 struct inet6_ifaddr *ifp;
4444 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
4446 cancel_delayed_work(&addr_chk_work);
4448 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
4450 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
4453 /* When setting preferred_lft to a value not zero or
4454 * infinity, while valid_lft is infinity
4455 * IFA_F_PERMANENT has a non-infinity life time.
4457 if ((ifp->flags & IFA_F_PERMANENT) &&
4458 (ifp->prefered_lft == INFINITY_LIFE_TIME))
4461 spin_lock(&ifp->lock);
4462 /* We try to batch several events at once. */
4463 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
4465 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4466 age >= ifp->valid_lft) {
4467 spin_unlock(&ifp->lock);
4471 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4472 spin_unlock(&ifp->lock);
4474 } else if (age >= ifp->prefered_lft) {
4475 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
4478 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4480 ifp->flags |= IFA_F_DEPRECATED;
4483 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4484 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
4485 next = ifp->tstamp + ifp->valid_lft * HZ;
4487 spin_unlock(&ifp->lock);
4492 ipv6_ifa_notify(0, ifp);
4496 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4497 !(ifp->flags&IFA_F_TENTATIVE)) {
4498 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4499 ifp->idev->cnf.dad_transmits *
4500 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
4502 if (age >= ifp->prefered_lft - regen_advance) {
4503 struct inet6_ifaddr *ifpub = ifp->ifpub;
4504 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4505 next = ifp->tstamp + ifp->prefered_lft * HZ;
4506 if (!ifp->regen_count && ifpub) {
4509 in6_ifa_hold(ifpub);
4510 spin_unlock(&ifp->lock);
4512 spin_lock(&ifpub->lock);
4513 ifpub->regen_count = 0;
4514 spin_unlock(&ifpub->lock);
4515 rcu_read_unlock_bh();
4516 ipv6_create_tempaddr(ifpub, ifp, true);
4522 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4523 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4524 spin_unlock(&ifp->lock);
4526 /* ifp->prefered_lft <= ifp->valid_lft */
4527 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4528 next = ifp->tstamp + ifp->prefered_lft * HZ;
4529 spin_unlock(&ifp->lock);
4534 next_sec = round_jiffies_up(next);
4537 /* If rounded timeout is accurate enough, accept it. */
4538 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4539 next_sched = next_sec;
4541 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4542 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4543 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4545 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4546 now, next, next_sec, next_sched);
4547 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
4548 rcu_read_unlock_bh();
4551 static void addrconf_verify_work(struct work_struct *w)
4554 addrconf_verify_rtnl();
4558 static void addrconf_verify(void)
4560 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4563 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4564 struct in6_addr **peer_pfx)
4566 struct in6_addr *pfx = NULL;
4571 pfx = nla_data(addr);
4574 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4576 pfx = nla_data(local);
4582 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4583 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4584 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4585 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
4586 [IFA_FLAGS] = { .len = sizeof(u32) },
4587 [IFA_RT_PRIORITY] = { .len = sizeof(u32) },
4588 [IFA_TARGET_NETNSID] = { .type = NLA_S32 },
4592 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
4593 struct netlink_ext_ack *extack)
4595 struct net *net = sock_net(skb->sk);
4596 struct ifaddrmsg *ifm;
4597 struct nlattr *tb[IFA_MAX+1];
4598 struct in6_addr *pfx, *peer_pfx;
4602 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4603 ifa_ipv6_policy, extack);
4607 ifm = nlmsg_data(nlh);
4608 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4612 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4614 /* We ignore other flags so far. */
4615 ifa_flags &= IFA_F_MANAGETEMPADDR;
4617 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4618 ifm->ifa_prefixlen);
4621 static int modify_prefix_route(struct inet6_ifaddr *ifp,
4622 unsigned long expires, u32 flags,
4625 struct fib6_info *f6i;
4628 f6i = addrconf_get_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
4630 ifp->idev->dev, 0, RTF_DEFAULT, true);
4634 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF;
4635 if (f6i->fib6_metric != prio) {
4636 /* delete old one */
4637 ip6_del_rt(dev_net(ifp->idev->dev), f6i);
4640 addrconf_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
4642 ifp->rt_priority, ifp->idev->dev,
4643 expires, flags, GFP_KERNEL);
4646 fib6_clean_expires(f6i);
4648 fib6_set_expires(f6i, expires);
4650 fib6_info_release(f6i);
4656 static int inet6_addr_modify(struct inet6_ifaddr *ifp, struct ifa6_config *cfg)
4660 unsigned long timeout;
4661 bool was_managetempaddr;
4662 bool had_prefixroute;
4663 bool new_peer = false;
4667 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
4670 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR &&
4671 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4674 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED)
4675 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC;
4677 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
4678 if (addrconf_finite_timeout(timeout)) {
4679 expires = jiffies_to_clock_t(timeout * HZ);
4680 cfg->valid_lft = timeout;
4681 flags = RTF_EXPIRES;
4685 cfg->ifa_flags |= IFA_F_PERMANENT;
4688 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
4689 if (addrconf_finite_timeout(timeout)) {
4691 cfg->ifa_flags |= IFA_F_DEPRECATED;
4692 cfg->preferred_lft = timeout;
4695 if (cfg->peer_pfx &&
4696 memcmp(&ifp->peer_addr, cfg->peer_pfx, sizeof(struct in6_addr))) {
4697 if (!ipv6_addr_any(&ifp->peer_addr))
4698 cleanup_prefix_route(ifp, expires, true, true);
4702 spin_lock_bh(&ifp->lock);
4703 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4704 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4705 !(ifp->flags & IFA_F_NOPREFIXROUTE);
4706 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4707 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4708 IFA_F_NOPREFIXROUTE);
4709 ifp->flags |= cfg->ifa_flags;
4710 ifp->tstamp = jiffies;
4711 ifp->valid_lft = cfg->valid_lft;
4712 ifp->prefered_lft = cfg->preferred_lft;
4714 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority)
4715 ifp->rt_priority = cfg->rt_priority;
4718 ifp->peer_addr = *cfg->peer_pfx;
4720 spin_unlock_bh(&ifp->lock);
4721 if (!(ifp->flags&IFA_F_TENTATIVE))
4722 ipv6_ifa_notify(0, ifp);
4724 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
4727 if (had_prefixroute)
4728 rc = modify_prefix_route(ifp, expires, flags, false);
4730 /* prefix route could have been deleted; if so restore it */
4731 if (rc == -ENOENT) {
4732 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
4733 ifp->rt_priority, ifp->idev->dev,
4734 expires, flags, GFP_KERNEL);
4737 if (had_prefixroute && !ipv6_addr_any(&ifp->peer_addr))
4738 rc = modify_prefix_route(ifp, expires, flags, true);
4740 if (rc == -ENOENT && !ipv6_addr_any(&ifp->peer_addr)) {
4741 addrconf_prefix_route(&ifp->peer_addr, ifp->prefix_len,
4742 ifp->rt_priority, ifp->idev->dev,
4743 expires, flags, GFP_KERNEL);
4745 } else if (had_prefixroute) {
4746 enum cleanup_prefix_rt_t action;
4747 unsigned long rt_expires;
4749 write_lock_bh(&ifp->idev->lock);
4750 action = check_cleanup_prefix_route(ifp, &rt_expires);
4751 write_unlock_bh(&ifp->idev->lock);
4753 if (action != CLEANUP_PREFIX_RT_NOP) {
4754 cleanup_prefix_route(ifp, rt_expires,
4755 action == CLEANUP_PREFIX_RT_DEL, false);
4759 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4760 if (was_managetempaddr &&
4761 !(ifp->flags & IFA_F_MANAGETEMPADDR)) {
4763 cfg->preferred_lft = 0;
4765 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft,
4766 cfg->preferred_lft, !was_managetempaddr,
4770 addrconf_verify_rtnl();
4776 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
4777 struct netlink_ext_ack *extack)
4779 struct net *net = sock_net(skb->sk);
4780 struct ifaddrmsg *ifm;
4781 struct nlattr *tb[IFA_MAX+1];
4782 struct in6_addr *peer_pfx;
4783 struct inet6_ifaddr *ifa;
4784 struct net_device *dev;
4785 struct inet6_dev *idev;
4786 struct ifa6_config cfg;
4789 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4790 ifa_ipv6_policy, extack);
4794 memset(&cfg, 0, sizeof(cfg));
4796 ifm = nlmsg_data(nlh);
4797 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4801 cfg.peer_pfx = peer_pfx;
4802 cfg.plen = ifm->ifa_prefixlen;
4803 if (tb[IFA_RT_PRIORITY])
4804 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]);
4806 cfg.valid_lft = INFINITY_LIFE_TIME;
4807 cfg.preferred_lft = INFINITY_LIFE_TIME;
4809 if (tb[IFA_CACHEINFO]) {
4810 struct ifa_cacheinfo *ci;
4812 ci = nla_data(tb[IFA_CACHEINFO]);
4813 cfg.valid_lft = ci->ifa_valid;
4814 cfg.preferred_lft = ci->ifa_prefered;
4817 dev = __dev_get_by_index(net, ifm->ifa_index);
4822 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]);
4824 cfg.ifa_flags = ifm->ifa_flags;
4826 /* We ignore other flags so far. */
4827 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS |
4828 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE |
4829 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC;
4831 idev = ipv6_find_idev(dev);
4833 return PTR_ERR(idev);
4835 if (!ipv6_allow_optimistic_dad(net, idev))
4836 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC;
4838 if (cfg.ifa_flags & IFA_F_NODAD &&
4839 cfg.ifa_flags & IFA_F_OPTIMISTIC) {
4840 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive");
4844 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1);
4847 * It would be best to check for !NLM_F_CREATE here but
4848 * userspace already relies on not having to provide this.
4850 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack);
4853 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4854 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4857 err = inet6_addr_modify(ifa, &cfg);
4864 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4865 u8 scope, int ifindex)
4867 struct ifaddrmsg *ifm;
4869 ifm = nlmsg_data(nlh);
4870 ifm->ifa_family = AF_INET6;
4871 ifm->ifa_prefixlen = prefixlen;
4872 ifm->ifa_flags = flags;
4873 ifm->ifa_scope = scope;
4874 ifm->ifa_index = ifindex;
4877 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4878 unsigned long tstamp, u32 preferred, u32 valid)
4880 struct ifa_cacheinfo ci;
4882 ci.cstamp = cstamp_delta(cstamp);
4883 ci.tstamp = cstamp_delta(tstamp);
4884 ci.ifa_prefered = preferred;
4885 ci.ifa_valid = valid;
4887 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4890 static inline int rt_scope(int ifa_scope)
4892 if (ifa_scope & IFA_HOST)
4893 return RT_SCOPE_HOST;
4894 else if (ifa_scope & IFA_LINK)
4895 return RT_SCOPE_LINK;
4896 else if (ifa_scope & IFA_SITE)
4897 return RT_SCOPE_SITE;
4899 return RT_SCOPE_UNIVERSE;
4902 static inline int inet6_ifaddr_msgsize(void)
4904 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4905 + nla_total_size(16) /* IFA_LOCAL */
4906 + nla_total_size(16) /* IFA_ADDRESS */
4907 + nla_total_size(sizeof(struct ifa_cacheinfo))
4908 + nla_total_size(4) /* IFA_FLAGS */
4909 + nla_total_size(4) /* IFA_RT_PRIORITY */;
4918 struct inet6_fill_args {
4925 enum addr_type_t type;
4928 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
4929 struct inet6_fill_args *args)
4931 struct nlmsghdr *nlh;
4932 u32 preferred, valid;
4934 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
4935 sizeof(struct ifaddrmsg), args->flags);
4939 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4940 ifa->idev->dev->ifindex);
4942 if (args->netnsid >= 0 &&
4943 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
4946 spin_lock_bh(&ifa->lock);
4947 if (!((ifa->flags&IFA_F_PERMANENT) &&
4948 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
4949 preferred = ifa->prefered_lft;
4950 valid = ifa->valid_lft;
4951 if (preferred != INFINITY_LIFE_TIME) {
4952 long tval = (jiffies - ifa->tstamp)/HZ;
4953 if (preferred > tval)
4957 if (valid != INFINITY_LIFE_TIME) {
4965 preferred = INFINITY_LIFE_TIME;
4966 valid = INFINITY_LIFE_TIME;
4968 spin_unlock_bh(&ifa->lock);
4970 if (!ipv6_addr_any(&ifa->peer_addr)) {
4971 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4972 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
4975 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
4978 if (ifa->rt_priority &&
4979 nla_put_u32(skb, IFA_RT_PRIORITY, ifa->rt_priority))
4982 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4985 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4988 nlmsg_end(skb, nlh);
4992 nlmsg_cancel(skb, nlh);
4996 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
4997 struct inet6_fill_args *args)
4999 struct nlmsghdr *nlh;
5000 u8 scope = RT_SCOPE_UNIVERSE;
5001 int ifindex = ifmca->idev->dev->ifindex;
5003 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
5004 scope = RT_SCOPE_SITE;
5006 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5007 sizeof(struct ifaddrmsg), args->flags);
5011 if (args->netnsid >= 0 &&
5012 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) {
5013 nlmsg_cancel(skb, nlh);
5017 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
5018 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
5019 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
5020 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
5021 nlmsg_cancel(skb, nlh);
5025 nlmsg_end(skb, nlh);
5029 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
5030 struct inet6_fill_args *args)
5032 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt);
5033 int ifindex = dev ? dev->ifindex : 1;
5034 struct nlmsghdr *nlh;
5035 u8 scope = RT_SCOPE_UNIVERSE;
5037 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
5038 scope = RT_SCOPE_SITE;
5040 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5041 sizeof(struct ifaddrmsg), args->flags);
5045 if (args->netnsid >= 0 &&
5046 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) {
5047 nlmsg_cancel(skb, nlh);
5051 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
5052 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
5053 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
5054 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
5055 nlmsg_cancel(skb, nlh);
5059 nlmsg_end(skb, nlh);
5063 /* called with rcu_read_lock() */
5064 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
5065 struct netlink_callback *cb, int s_ip_idx,
5066 struct inet6_fill_args *fillargs)
5068 struct ifmcaddr6 *ifmca;
5069 struct ifacaddr6 *ifaca;
5073 read_lock_bh(&idev->lock);
5074 switch (fillargs->type) {
5075 case UNICAST_ADDR: {
5076 struct inet6_ifaddr *ifa;
5077 fillargs->event = RTM_NEWADDR;
5079 /* unicast address incl. temp addr */
5080 list_for_each_entry(ifa, &idev->addr_list, if_list) {
5081 if (ip_idx < s_ip_idx)
5083 err = inet6_fill_ifaddr(skb, ifa, fillargs);
5086 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
5092 case MULTICAST_ADDR:
5093 fillargs->event = RTM_GETMULTICAST;
5095 /* multicast address */
5096 for (ifmca = idev->mc_list; ifmca;
5097 ifmca = ifmca->next, ip_idx++) {
5098 if (ip_idx < s_ip_idx)
5100 err = inet6_fill_ifmcaddr(skb, ifmca, fillargs);
5106 fillargs->event = RTM_GETANYCAST;
5107 /* anycast address */
5108 for (ifaca = idev->ac_list; ifaca;
5109 ifaca = ifaca->aca_next, ip_idx++) {
5110 if (ip_idx < s_ip_idx)
5112 err = inet6_fill_ifacaddr(skb, ifaca, fillargs);
5120 read_unlock_bh(&idev->lock);
5121 cb->args[2] = ip_idx;
5125 static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh,
5126 struct inet6_fill_args *fillargs,
5127 struct net **tgt_net, struct sock *sk,
5128 struct netlink_callback *cb)
5130 struct netlink_ext_ack *extack = cb->extack;
5131 struct nlattr *tb[IFA_MAX+1];
5132 struct ifaddrmsg *ifm;
5135 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5136 NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request");
5140 ifm = nlmsg_data(nlh);
5141 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5142 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request");
5146 fillargs->ifindex = ifm->ifa_index;
5147 if (fillargs->ifindex) {
5148 cb->answer_flags |= NLM_F_DUMP_FILTERED;
5149 fillargs->flags |= NLM_F_DUMP_FILTERED;
5152 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5153 ifa_ipv6_policy, extack);
5157 for (i = 0; i <= IFA_MAX; ++i) {
5161 if (i == IFA_TARGET_NETNSID) {
5164 fillargs->netnsid = nla_get_s32(tb[i]);
5165 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid);
5167 fillargs->netnsid = -1;
5168 NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id");
5169 return PTR_ERR(net);
5173 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request");
5181 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
5182 enum addr_type_t type)
5184 const struct nlmsghdr *nlh = cb->nlh;
5185 struct inet6_fill_args fillargs = {
5186 .portid = NETLINK_CB(cb->skb).portid,
5187 .seq = cb->nlh->nlmsg_seq,
5188 .flags = NLM_F_MULTI,
5192 struct net *net = sock_net(skb->sk);
5193 struct net *tgt_net = net;
5194 int idx, s_idx, s_ip_idx;
5196 struct net_device *dev;
5197 struct inet6_dev *idev;
5198 struct hlist_head *head;
5202 s_idx = idx = cb->args[1];
5203 s_ip_idx = cb->args[2];
5205 if (cb->strict_check) {
5206 err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net,
5212 if (fillargs.ifindex) {
5213 dev = __dev_get_by_index(tgt_net, fillargs.ifindex);
5218 idev = __in6_dev_get(dev);
5220 err = in6_dump_addrs(idev, skb, cb, s_ip_idx,
5230 cb->seq = atomic_read(&tgt_net->ipv6.dev_addr_genid) ^ tgt_net->dev_base_seq;
5231 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5233 head = &tgt_net->dev_index_head[h];
5234 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5237 if (h > s_h || idx > s_idx)
5239 idev = __in6_dev_get(dev);
5243 if (in6_dump_addrs(idev, skb, cb, s_ip_idx,
5255 if (fillargs.netnsid >= 0)
5258 return skb->len ? : err;
5261 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
5263 enum addr_type_t type = UNICAST_ADDR;
5265 return inet6_dump_addr(skb, cb, type);
5268 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
5270 enum addr_type_t type = MULTICAST_ADDR;
5272 return inet6_dump_addr(skb, cb, type);
5276 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
5278 enum addr_type_t type = ANYCAST_ADDR;
5280 return inet6_dump_addr(skb, cb, type);
5283 static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb,
5284 const struct nlmsghdr *nlh,
5286 struct netlink_ext_ack *extack)
5288 struct ifaddrmsg *ifm;
5291 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5292 NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request");
5296 if (!netlink_strict_get_check(skb))
5297 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
5298 ifa_ipv6_policy, extack);
5300 ifm = nlmsg_data(nlh);
5301 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5302 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request");
5306 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5307 ifa_ipv6_policy, extack);
5311 for (i = 0; i <= IFA_MAX; i++) {
5316 case IFA_TARGET_NETNSID:
5321 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request");
5329 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
5330 struct netlink_ext_ack *extack)
5332 struct net *net = sock_net(in_skb->sk);
5333 struct inet6_fill_args fillargs = {
5334 .portid = NETLINK_CB(in_skb).portid,
5335 .seq = nlh->nlmsg_seq,
5336 .event = RTM_NEWADDR,
5340 struct net *tgt_net = net;
5341 struct ifaddrmsg *ifm;
5342 struct nlattr *tb[IFA_MAX+1];
5343 struct in6_addr *addr = NULL, *peer;
5344 struct net_device *dev = NULL;
5345 struct inet6_ifaddr *ifa;
5346 struct sk_buff *skb;
5349 err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack);
5353 if (tb[IFA_TARGET_NETNSID]) {
5354 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]);
5356 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk,
5358 if (IS_ERR(tgt_net))
5359 return PTR_ERR(tgt_net);
5362 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
5366 ifm = nlmsg_data(nlh);
5368 dev = dev_get_by_index(tgt_net, ifm->ifa_index);
5370 ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1);
5372 err = -EADDRNOTAVAIL;
5376 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
5382 err = inet6_fill_ifaddr(skb, ifa, &fillargs);
5384 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5385 WARN_ON(err == -EMSGSIZE);
5389 err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid);
5395 if (fillargs.netnsid >= 0)
5401 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
5403 struct sk_buff *skb;
5404 struct net *net = dev_net(ifa->idev->dev);
5405 struct inet6_fill_args fillargs = {
5414 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5418 err = inet6_fill_ifaddr(skb, ifa, &fillargs);
5420 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5421 WARN_ON(err == -EMSGSIZE);
5425 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
5429 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
5432 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
5433 __s32 *array, int bytes)
5435 BUG_ON(bytes < (DEVCONF_MAX * 4));
5437 memset(array, 0, bytes);
5438 array[DEVCONF_FORWARDING] = cnf->forwarding;
5439 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
5440 array[DEVCONF_MTU6] = cnf->mtu6;
5441 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
5442 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
5443 array[DEVCONF_AUTOCONF] = cnf->autoconf;
5444 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
5445 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
5446 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
5447 jiffies_to_msecs(cnf->rtr_solicit_interval);
5448 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
5449 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
5450 array[DEVCONF_RTR_SOLICIT_DELAY] =
5451 jiffies_to_msecs(cnf->rtr_solicit_delay);
5452 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
5453 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
5454 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
5455 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
5456 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
5457 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
5458 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
5459 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
5460 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
5461 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
5462 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
5463 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
5464 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
5465 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
5466 #ifdef CONFIG_IPV6_ROUTER_PREF
5467 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
5468 array[DEVCONF_RTR_PROBE_INTERVAL] =
5469 jiffies_to_msecs(cnf->rtr_probe_interval);
5470 #ifdef CONFIG_IPV6_ROUTE_INFO
5471 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen;
5472 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
5475 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
5476 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
5477 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5478 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
5479 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
5481 #ifdef CONFIG_IPV6_MROUTE
5482 array[DEVCONF_MC_FORWARDING] = atomic_read(&cnf->mc_forwarding);
5484 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
5485 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
5486 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5487 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
5488 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
5489 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
5490 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
5491 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
5492 /* we omit DEVCONF_STABLE_SECRET for now */
5493 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
5494 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
5495 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
5496 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
5497 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled;
5498 #ifdef CONFIG_IPV6_SEG6_HMAC
5499 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac;
5501 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad;
5502 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode;
5503 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy;
5504 array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass;
5507 static inline size_t inet6_ifla6_size(void)
5509 return nla_total_size(4) /* IFLA_INET6_FLAGS */
5510 + nla_total_size(sizeof(struct ifla_cacheinfo))
5511 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5512 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
5513 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
5514 + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */
5515 + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */
5519 static inline size_t inet6_if_nlmsg_size(void)
5521 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5522 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5523 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5524 + nla_total_size(4) /* IFLA_MTU */
5525 + nla_total_size(4) /* IFLA_LINK */
5526 + nla_total_size(1) /* IFLA_OPERSTATE */
5527 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
5530 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
5534 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
5537 /* Use put_unaligned() because stats may not be aligned for u64. */
5538 put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5539 for (i = 1; i < ICMP6_MIB_MAX; i++)
5540 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
5542 memset(&stats[ICMP6_MIB_MAX], 0, pad);
5545 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
5546 int bytes, size_t syncpoff)
5549 u64 buff[IPSTATS_MIB_MAX];
5550 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5554 memset(buff, 0, sizeof(buff));
5555 buff[0] = IPSTATS_MIB_MAX;
5557 for_each_possible_cpu(c) {
5558 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5559 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5562 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5563 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
5566 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5570 case IFLA_INET6_STATS:
5571 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5572 offsetof(struct ipstats_mib, syncp));
5574 case IFLA_INET6_ICMP6STATS:
5575 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
5580 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5581 u32 ext_filter_mask)
5584 struct ifla_cacheinfo ci;
5586 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5587 goto nla_put_failure;
5588 ci.max_reasm_len = IPV6_MAXPLEN;
5589 ci.tstamp = cstamp_delta(idev->tstamp);
5590 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
5591 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
5592 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5593 goto nla_put_failure;
5594 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
5596 goto nla_put_failure;
5597 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5599 /* XXX - MC not implemented */
5601 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5604 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
5606 goto nla_put_failure;
5607 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5609 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
5611 goto nla_put_failure;
5612 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5614 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
5616 goto nla_put_failure;
5618 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode))
5619 goto nla_put_failure;
5621 read_lock_bh(&idev->lock);
5622 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5623 read_unlock_bh(&idev->lock);
5631 static size_t inet6_get_link_af_size(const struct net_device *dev,
5632 u32 ext_filter_mask)
5634 if (!__in6_dev_get(dev))
5637 return inet6_ifla6_size();
5640 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5641 u32 ext_filter_mask)
5643 struct inet6_dev *idev = __in6_dev_get(dev);
5648 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
5654 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
5656 struct inet6_ifaddr *ifp;
5657 struct net_device *dev = idev->dev;
5658 bool clear_token, update_rs = false;
5659 struct in6_addr ll_addr;
5665 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5667 if (!ipv6_accept_ra(idev))
5669 if (idev->cnf.rtr_solicits == 0)
5672 write_lock_bh(&idev->lock);
5674 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5675 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5677 write_unlock_bh(&idev->lock);
5679 clear_token = ipv6_addr_any(token);
5683 if (!idev->dead && (idev->if_flags & IF_READY) &&
5684 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5685 IFA_F_OPTIMISTIC)) {
5686 /* If we're not ready, then normal ifup will take care
5687 * of this. Otherwise, we need to request our rs here.
5689 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5694 write_lock_bh(&idev->lock);
5697 idev->if_flags |= IF_RS_SENT;
5698 idev->rs_interval = rfc3315_s14_backoff_init(
5699 idev->cnf.rtr_solicit_interval);
5700 idev->rs_probes = 1;
5701 addrconf_mod_rs_timer(idev, idev->rs_interval);
5704 /* Well, that's kinda nasty ... */
5705 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5706 spin_lock(&ifp->lock);
5707 if (ifp->tokenized) {
5709 ifp->prefered_lft = 0;
5711 spin_unlock(&ifp->lock);
5714 write_unlock_bh(&idev->lock);
5715 inet6_ifinfo_notify(RTM_NEWLINK, idev);
5716 addrconf_verify_rtnl();
5720 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5721 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5722 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5725 static int check_addr_gen_mode(int mode)
5727 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5728 mode != IN6_ADDR_GEN_MODE_NONE &&
5729 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5730 mode != IN6_ADDR_GEN_MODE_RANDOM)
5735 static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5738 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5739 !idev->cnf.stable_secret.initialized &&
5740 !net->ipv6.devconf_dflt->stable_secret.initialized)
5745 static int inet6_validate_link_af(const struct net_device *dev,
5746 const struct nlattr *nla)
5748 struct nlattr *tb[IFLA_INET6_MAX + 1];
5749 struct inet6_dev *idev = NULL;
5753 idev = __in6_dev_get(dev);
5755 return -EAFNOSUPPORT;
5758 err = nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla,
5759 inet6_af_policy, NULL);
5763 if (!tb[IFLA_INET6_TOKEN] && !tb[IFLA_INET6_ADDR_GEN_MODE])
5766 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5767 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5769 if (check_addr_gen_mode(mode) < 0)
5771 if (dev && check_stable_privacy(idev, dev_net(dev), mode) < 0)
5778 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5780 struct inet6_dev *idev = __in6_dev_get(dev);
5781 struct nlattr *tb[IFLA_INET6_MAX + 1];
5785 return -EAFNOSUPPORT;
5787 if (nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0)
5790 if (tb[IFLA_INET6_TOKEN]) {
5791 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
5796 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5797 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5799 idev->cnf.addr_gen_mode = mode;
5805 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
5806 u32 portid, u32 seq, int event, unsigned int flags)
5808 struct net_device *dev = idev->dev;
5809 struct ifinfomsg *hdr;
5810 struct nlmsghdr *nlh;
5813 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
5817 hdr = nlmsg_data(nlh);
5818 hdr->ifi_family = AF_INET6;
5820 hdr->ifi_type = dev->type;
5821 hdr->ifi_index = dev->ifindex;
5822 hdr->ifi_flags = dev_get_flags(dev);
5823 hdr->ifi_change = 0;
5825 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5827 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5828 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
5829 (dev->ifindex != dev_get_iflink(dev) &&
5830 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5831 nla_put_u8(skb, IFLA_OPERSTATE,
5832 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
5833 goto nla_put_failure;
5834 protoinfo = nla_nest_start_noflag(skb, IFLA_PROTINFO);
5836 goto nla_put_failure;
5838 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
5839 goto nla_put_failure;
5841 nla_nest_end(skb, protoinfo);
5842 nlmsg_end(skb, nlh);
5846 nlmsg_cancel(skb, nlh);
5850 static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh,
5851 struct netlink_ext_ack *extack)
5853 struct ifinfomsg *ifm;
5855 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5856 NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request");
5860 if (nlmsg_attrlen(nlh, sizeof(*ifm))) {
5861 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header");
5865 ifm = nlmsg_data(nlh);
5866 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
5867 ifm->ifi_change || ifm->ifi_index) {
5868 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request");
5875 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5877 struct net *net = sock_net(skb->sk);
5880 struct net_device *dev;
5881 struct inet6_dev *idev;
5882 struct hlist_head *head;
5884 /* only requests using strict checking can pass data to
5885 * influence the dump
5887 if (cb->strict_check) {
5888 int err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack);
5895 s_idx = cb->args[1];
5898 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5900 head = &net->dev_index_head[h];
5901 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5904 idev = __in6_dev_get(dev);
5907 if (inet6_fill_ifinfo(skb, idev,
5908 NETLINK_CB(cb->skb).portid,
5910 RTM_NEWLINK, NLM_F_MULTI) < 0)
5924 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5926 struct sk_buff *skb;
5927 struct net *net = dev_net(idev->dev);
5930 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
5934 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
5936 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5937 WARN_ON(err == -EMSGSIZE);
5941 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
5945 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
5948 static inline size_t inet6_prefix_nlmsg_size(void)
5950 return NLMSG_ALIGN(sizeof(struct prefixmsg))
5951 + nla_total_size(sizeof(struct in6_addr))
5952 + nla_total_size(sizeof(struct prefix_cacheinfo));
5955 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
5956 struct prefix_info *pinfo, u32 portid, u32 seq,
5957 int event, unsigned int flags)
5959 struct prefixmsg *pmsg;
5960 struct nlmsghdr *nlh;
5961 struct prefix_cacheinfo ci;
5963 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
5967 pmsg = nlmsg_data(nlh);
5968 pmsg->prefix_family = AF_INET6;
5969 pmsg->prefix_pad1 = 0;
5970 pmsg->prefix_pad2 = 0;
5971 pmsg->prefix_ifindex = idev->dev->ifindex;
5972 pmsg->prefix_len = pinfo->prefix_len;
5973 pmsg->prefix_type = pinfo->type;
5974 pmsg->prefix_pad3 = 0;
5975 pmsg->prefix_flags = 0;
5977 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5978 if (pinfo->autoconf)
5979 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5981 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5982 goto nla_put_failure;
5983 ci.preferred_time = ntohl(pinfo->prefered);
5984 ci.valid_time = ntohl(pinfo->valid);
5985 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5986 goto nla_put_failure;
5987 nlmsg_end(skb, nlh);
5991 nlmsg_cancel(skb, nlh);
5995 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
5996 struct prefix_info *pinfo)
5998 struct sk_buff *skb;
5999 struct net *net = dev_net(idev->dev);
6002 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
6006 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
6008 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
6009 WARN_ON(err == -EMSGSIZE);
6013 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
6017 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
6020 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
6022 struct net *net = dev_net(ifp->idev->dev);
6027 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
6032 * If the address was optimistic we inserted the route at the
6033 * start of our DAD process, so we don't need to do it again.
6034 * If the device was taken down in the middle of the DAD
6035 * cycle there is a race where we could get here without a
6036 * host route, so nothing to insert. That will be fixed when
6037 * the device is brought up.
6039 if (ifp->rt && !rcu_access_pointer(ifp->rt->fib6_node)) {
6040 ip6_ins_rt(net, ifp->rt);
6041 } else if (!ifp->rt && (ifp->idev->dev->flags & IFF_UP)) {
6042 pr_warn("BUG: Address %pI6c on device %s is missing its host route.\n",
6043 &ifp->addr, ifp->idev->dev->name);
6046 if (ifp->idev->cnf.forwarding)
6047 addrconf_join_anycast(ifp);
6048 if (!ipv6_addr_any(&ifp->peer_addr))
6049 addrconf_prefix_route(&ifp->peer_addr, 128,
6050 ifp->rt_priority, ifp->idev->dev,
6054 if (ifp->idev->cnf.forwarding)
6055 addrconf_leave_anycast(ifp);
6056 addrconf_leave_solict(ifp->idev, &ifp->addr);
6057 if (!ipv6_addr_any(&ifp->peer_addr)) {
6058 struct fib6_info *rt;
6060 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
6061 ifp->idev->dev, 0, 0,
6064 ip6_del_rt(net, rt);
6067 ip6_del_rt(net, ifp->rt);
6070 rt_genid_bump_ipv6(net);
6073 atomic_inc(&net->ipv6.dev_addr_genid);
6076 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
6079 if (likely(ifp->idev->dead == 0))
6080 __ipv6_ifa_notify(event, ifp);
6081 rcu_read_unlock_bh();
6084 #ifdef CONFIG_SYSCTL
6087 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
6088 void __user *buffer, size_t *lenp, loff_t *ppos)
6090 int *valp = ctl->data;
6093 struct ctl_table lctl;
6097 * ctl->data points to idev->cnf.forwarding, we should
6098 * not modify it until we get the rtnl lock.
6103 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6106 ret = addrconf_fixup_forwarding(ctl, valp, val);
6113 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
6114 void __user *buffer, size_t *lenp, loff_t *ppos)
6116 struct inet6_dev *idev = ctl->extra1;
6117 int min_mtu = IPV6_MIN_MTU;
6118 struct ctl_table lctl;
6121 lctl.extra1 = &min_mtu;
6122 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
6124 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
6127 static void dev_disable_change(struct inet6_dev *idev)
6129 struct netdev_notifier_info info;
6131 if (!idev || !idev->dev)
6134 netdev_notifier_info_init(&info, idev->dev);
6135 if (idev->cnf.disable_ipv6)
6136 addrconf_notify(NULL, NETDEV_DOWN, &info);
6138 addrconf_notify(NULL, NETDEV_UP, &info);
6141 static void addrconf_disable_change(struct net *net, __s32 newf)
6143 struct net_device *dev;
6144 struct inet6_dev *idev;
6146 for_each_netdev(net, dev) {
6147 idev = __in6_dev_get(dev);
6149 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
6150 idev->cnf.disable_ipv6 = newf;
6152 dev_disable_change(idev);
6157 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
6162 if (!rtnl_trylock())
6163 return restart_syscall();
6165 net = (struct net *)table->extra2;
6169 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
6174 if (p == &net->ipv6.devconf_all->disable_ipv6) {
6175 net->ipv6.devconf_dflt->disable_ipv6 = newf;
6176 addrconf_disable_change(net, newf);
6177 } else if ((!newf) ^ (!old))
6178 dev_disable_change((struct inet6_dev *)table->extra1);
6185 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
6186 void __user *buffer, size_t *lenp, loff_t *ppos)
6188 int *valp = ctl->data;
6191 struct ctl_table lctl;
6195 * ctl->data points to idev->cnf.disable_ipv6, we should
6196 * not modify it until we get the rtnl lock.
6201 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6204 ret = addrconf_disable_ipv6(ctl, valp, val);
6211 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
6212 void __user *buffer, size_t *lenp, loff_t *ppos)
6214 int *valp = ctl->data;
6219 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
6222 if (write && old != new) {
6223 struct net *net = ctl->extra2;
6225 if (!rtnl_trylock())
6226 return restart_syscall();
6228 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
6229 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6230 NETCONFA_PROXY_NEIGH,
6231 NETCONFA_IFINDEX_DEFAULT,
6232 net->ipv6.devconf_dflt);
6233 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
6234 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6235 NETCONFA_PROXY_NEIGH,
6236 NETCONFA_IFINDEX_ALL,
6237 net->ipv6.devconf_all);
6239 struct inet6_dev *idev = ctl->extra1;
6241 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6242 NETCONFA_PROXY_NEIGH,
6252 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
6253 void __user *buffer, size_t *lenp,
6258 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
6259 struct net *net = (struct net *)ctl->extra2;
6260 struct ctl_table tmp = {
6262 .maxlen = sizeof(new_val),
6266 if (!rtnl_trylock())
6267 return restart_syscall();
6269 new_val = *((u32 *)ctl->data);
6271 ret = proc_douintvec(&tmp, write, buffer, lenp, ppos);
6276 if (check_addr_gen_mode(new_val) < 0) {
6282 if (check_stable_privacy(idev, net, new_val) < 0) {
6287 if (idev->cnf.addr_gen_mode != new_val) {
6288 idev->cnf.addr_gen_mode = new_val;
6289 addrconf_dev_config(idev->dev);
6291 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) {
6292 struct net_device *dev;
6294 net->ipv6.devconf_dflt->addr_gen_mode = new_val;
6295 for_each_netdev(net, dev) {
6296 idev = __in6_dev_get(dev);
6298 idev->cnf.addr_gen_mode != new_val) {
6299 idev->cnf.addr_gen_mode = new_val;
6300 addrconf_dev_config(idev->dev);
6305 *((u32 *)ctl->data) = new_val;
6314 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
6315 void __user *buffer, size_t *lenp,
6319 struct in6_addr addr;
6320 char str[IPV6_MAX_STRLEN];
6321 struct ctl_table lctl = *ctl;
6322 struct net *net = ctl->extra2;
6323 struct ipv6_stable_secret *secret = ctl->data;
6325 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
6328 lctl.maxlen = IPV6_MAX_STRLEN;
6331 if (!rtnl_trylock())
6332 return restart_syscall();
6334 if (!write && !secret->initialized) {
6339 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
6340 if (err >= sizeof(str)) {
6345 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
6349 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
6354 secret->initialized = true;
6355 secret->secret = addr;
6357 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
6358 struct net_device *dev;
6360 for_each_netdev(net, dev) {
6361 struct inet6_dev *idev = __in6_dev_get(dev);
6364 idev->cnf.addr_gen_mode =
6365 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
6369 struct inet6_dev *idev = ctl->extra1;
6371 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
6381 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
6383 void __user *buffer,
6387 int *valp = ctl->data;
6390 struct ctl_table lctl;
6393 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
6394 * we should not modify it until we get the rtnl lock.
6399 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6402 ret = addrconf_fixup_linkdown(ctl, valp, val);
6409 void addrconf_set_nopolicy(struct rt6_info *rt, int action)
6413 rt->dst.flags |= DST_NOPOLICY;
6415 rt->dst.flags &= ~DST_NOPOLICY;
6420 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
6422 struct inet6_ifaddr *ifa;
6424 read_lock_bh(&idev->lock);
6425 list_for_each_entry(ifa, &idev->addr_list, if_list) {
6426 spin_lock(&ifa->lock);
6428 /* host routes only use builtin fib6_nh */
6429 struct fib6_nh *nh = ifa->rt->fib6_nh;
6433 ifa->rt->dst_nopolicy = val ? true : false;
6434 if (nh->rt6i_pcpu) {
6435 for_each_possible_cpu(cpu) {
6436 struct rt6_info **rtp;
6438 rtp = per_cpu_ptr(nh->rt6i_pcpu, cpu);
6439 addrconf_set_nopolicy(*rtp, val);
6444 spin_unlock(&ifa->lock);
6446 read_unlock_bh(&idev->lock);
6450 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val)
6452 struct inet6_dev *idev;
6455 if (!rtnl_trylock())
6456 return restart_syscall();
6460 net = (struct net *)ctl->extra2;
6461 if (valp == &net->ipv6.devconf_dflt->disable_policy) {
6466 if (valp == &net->ipv6.devconf_all->disable_policy) {
6467 struct net_device *dev;
6469 for_each_netdev(net, dev) {
6470 idev = __in6_dev_get(dev);
6472 addrconf_disable_policy_idev(idev, val);
6475 idev = (struct inet6_dev *)ctl->extra1;
6476 addrconf_disable_policy_idev(idev, val);
6484 int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write,
6485 void __user *buffer, size_t *lenp,
6488 int *valp = ctl->data;
6491 struct ctl_table lctl;
6496 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6498 if (write && (*valp != val))
6499 ret = addrconf_disable_policy(ctl, valp, val);
6507 static int minus_one = -1;
6508 static const int two_five_five = 255;
6510 static const struct ctl_table addrconf_sysctl[] = {
6512 .procname = "forwarding",
6513 .data = &ipv6_devconf.forwarding,
6514 .maxlen = sizeof(int),
6516 .proc_handler = addrconf_sysctl_forward,
6519 .procname = "hop_limit",
6520 .data = &ipv6_devconf.hop_limit,
6521 .maxlen = sizeof(int),
6523 .proc_handler = proc_dointvec_minmax,
6524 .extra1 = (void *)SYSCTL_ONE,
6525 .extra2 = (void *)&two_five_five,
6529 .data = &ipv6_devconf.mtu6,
6530 .maxlen = sizeof(int),
6532 .proc_handler = addrconf_sysctl_mtu,
6535 .procname = "accept_ra",
6536 .data = &ipv6_devconf.accept_ra,
6537 .maxlen = sizeof(int),
6539 .proc_handler = proc_dointvec,
6542 .procname = "accept_redirects",
6543 .data = &ipv6_devconf.accept_redirects,
6544 .maxlen = sizeof(int),
6546 .proc_handler = proc_dointvec,
6549 .procname = "autoconf",
6550 .data = &ipv6_devconf.autoconf,
6551 .maxlen = sizeof(int),
6553 .proc_handler = proc_dointvec,
6556 .procname = "dad_transmits",
6557 .data = &ipv6_devconf.dad_transmits,
6558 .maxlen = sizeof(int),
6560 .proc_handler = proc_dointvec,
6563 .procname = "router_solicitations",
6564 .data = &ipv6_devconf.rtr_solicits,
6565 .maxlen = sizeof(int),
6567 .proc_handler = proc_dointvec_minmax,
6568 .extra1 = &minus_one,
6571 .procname = "router_solicitation_interval",
6572 .data = &ipv6_devconf.rtr_solicit_interval,
6573 .maxlen = sizeof(int),
6575 .proc_handler = proc_dointvec_jiffies,
6578 .procname = "router_solicitation_max_interval",
6579 .data = &ipv6_devconf.rtr_solicit_max_interval,
6580 .maxlen = sizeof(int),
6582 .proc_handler = proc_dointvec_jiffies,
6585 .procname = "router_solicitation_delay",
6586 .data = &ipv6_devconf.rtr_solicit_delay,
6587 .maxlen = sizeof(int),
6589 .proc_handler = proc_dointvec_jiffies,
6592 .procname = "force_mld_version",
6593 .data = &ipv6_devconf.force_mld_version,
6594 .maxlen = sizeof(int),
6596 .proc_handler = proc_dointvec,
6599 .procname = "mldv1_unsolicited_report_interval",
6601 &ipv6_devconf.mldv1_unsolicited_report_interval,
6602 .maxlen = sizeof(int),
6604 .proc_handler = proc_dointvec_ms_jiffies,
6607 .procname = "mldv2_unsolicited_report_interval",
6609 &ipv6_devconf.mldv2_unsolicited_report_interval,
6610 .maxlen = sizeof(int),
6612 .proc_handler = proc_dointvec_ms_jiffies,
6615 .procname = "use_tempaddr",
6616 .data = &ipv6_devconf.use_tempaddr,
6617 .maxlen = sizeof(int),
6619 .proc_handler = proc_dointvec,
6622 .procname = "temp_valid_lft",
6623 .data = &ipv6_devconf.temp_valid_lft,
6624 .maxlen = sizeof(int),
6626 .proc_handler = proc_dointvec,
6629 .procname = "temp_prefered_lft",
6630 .data = &ipv6_devconf.temp_prefered_lft,
6631 .maxlen = sizeof(int),
6633 .proc_handler = proc_dointvec,
6636 .procname = "regen_max_retry",
6637 .data = &ipv6_devconf.regen_max_retry,
6638 .maxlen = sizeof(int),
6640 .proc_handler = proc_dointvec,
6643 .procname = "max_desync_factor",
6644 .data = &ipv6_devconf.max_desync_factor,
6645 .maxlen = sizeof(int),
6647 .proc_handler = proc_dointvec,
6650 .procname = "max_addresses",
6651 .data = &ipv6_devconf.max_addresses,
6652 .maxlen = sizeof(int),
6654 .proc_handler = proc_dointvec,
6657 .procname = "accept_ra_defrtr",
6658 .data = &ipv6_devconf.accept_ra_defrtr,
6659 .maxlen = sizeof(int),
6661 .proc_handler = proc_dointvec,
6664 .procname = "accept_ra_min_hop_limit",
6665 .data = &ipv6_devconf.accept_ra_min_hop_limit,
6666 .maxlen = sizeof(int),
6668 .proc_handler = proc_dointvec,
6671 .procname = "accept_ra_pinfo",
6672 .data = &ipv6_devconf.accept_ra_pinfo,
6673 .maxlen = sizeof(int),
6675 .proc_handler = proc_dointvec,
6677 #ifdef CONFIG_IPV6_ROUTER_PREF
6679 .procname = "accept_ra_rtr_pref",
6680 .data = &ipv6_devconf.accept_ra_rtr_pref,
6681 .maxlen = sizeof(int),
6683 .proc_handler = proc_dointvec,
6686 .procname = "router_probe_interval",
6687 .data = &ipv6_devconf.rtr_probe_interval,
6688 .maxlen = sizeof(int),
6690 .proc_handler = proc_dointvec_jiffies,
6692 #ifdef CONFIG_IPV6_ROUTE_INFO
6694 .procname = "accept_ra_rt_info_min_plen",
6695 .data = &ipv6_devconf.accept_ra_rt_info_min_plen,
6696 .maxlen = sizeof(int),
6698 .proc_handler = proc_dointvec,
6701 .procname = "accept_ra_rt_info_max_plen",
6702 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
6703 .maxlen = sizeof(int),
6705 .proc_handler = proc_dointvec,
6710 .procname = "proxy_ndp",
6711 .data = &ipv6_devconf.proxy_ndp,
6712 .maxlen = sizeof(int),
6714 .proc_handler = addrconf_sysctl_proxy_ndp,
6717 .procname = "accept_source_route",
6718 .data = &ipv6_devconf.accept_source_route,
6719 .maxlen = sizeof(int),
6721 .proc_handler = proc_dointvec,
6723 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
6725 .procname = "optimistic_dad",
6726 .data = &ipv6_devconf.optimistic_dad,
6727 .maxlen = sizeof(int),
6729 .proc_handler = proc_dointvec,
6732 .procname = "use_optimistic",
6733 .data = &ipv6_devconf.use_optimistic,
6734 .maxlen = sizeof(int),
6736 .proc_handler = proc_dointvec,
6739 #ifdef CONFIG_IPV6_MROUTE
6741 .procname = "mc_forwarding",
6742 .data = &ipv6_devconf.mc_forwarding,
6743 .maxlen = sizeof(int),
6745 .proc_handler = proc_dointvec,
6749 .procname = "disable_ipv6",
6750 .data = &ipv6_devconf.disable_ipv6,
6751 .maxlen = sizeof(int),
6753 .proc_handler = addrconf_sysctl_disable,
6756 .procname = "accept_dad",
6757 .data = &ipv6_devconf.accept_dad,
6758 .maxlen = sizeof(int),
6760 .proc_handler = proc_dointvec,
6763 .procname = "force_tllao",
6764 .data = &ipv6_devconf.force_tllao,
6765 .maxlen = sizeof(int),
6767 .proc_handler = proc_dointvec
6770 .procname = "ndisc_notify",
6771 .data = &ipv6_devconf.ndisc_notify,
6772 .maxlen = sizeof(int),
6774 .proc_handler = proc_dointvec
6777 .procname = "suppress_frag_ndisc",
6778 .data = &ipv6_devconf.suppress_frag_ndisc,
6779 .maxlen = sizeof(int),
6781 .proc_handler = proc_dointvec
6784 .procname = "accept_ra_from_local",
6785 .data = &ipv6_devconf.accept_ra_from_local,
6786 .maxlen = sizeof(int),
6788 .proc_handler = proc_dointvec,
6791 .procname = "accept_ra_mtu",
6792 .data = &ipv6_devconf.accept_ra_mtu,
6793 .maxlen = sizeof(int),
6795 .proc_handler = proc_dointvec,
6798 .procname = "stable_secret",
6799 .data = &ipv6_devconf.stable_secret,
6800 .maxlen = IPV6_MAX_STRLEN,
6802 .proc_handler = addrconf_sysctl_stable_secret,
6805 .procname = "use_oif_addrs_only",
6806 .data = &ipv6_devconf.use_oif_addrs_only,
6807 .maxlen = sizeof(int),
6809 .proc_handler = proc_dointvec,
6812 .procname = "ignore_routes_with_linkdown",
6813 .data = &ipv6_devconf.ignore_routes_with_linkdown,
6814 .maxlen = sizeof(int),
6816 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
6819 .procname = "drop_unicast_in_l2_multicast",
6820 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
6821 .maxlen = sizeof(int),
6823 .proc_handler = proc_dointvec,
6826 .procname = "drop_unsolicited_na",
6827 .data = &ipv6_devconf.drop_unsolicited_na,
6828 .maxlen = sizeof(int),
6830 .proc_handler = proc_dointvec,
6833 .procname = "keep_addr_on_down",
6834 .data = &ipv6_devconf.keep_addr_on_down,
6835 .maxlen = sizeof(int),
6837 .proc_handler = proc_dointvec,
6841 .procname = "seg6_enabled",
6842 .data = &ipv6_devconf.seg6_enabled,
6843 .maxlen = sizeof(int),
6845 .proc_handler = proc_dointvec,
6847 #ifdef CONFIG_IPV6_SEG6_HMAC
6849 .procname = "seg6_require_hmac",
6850 .data = &ipv6_devconf.seg6_require_hmac,
6851 .maxlen = sizeof(int),
6853 .proc_handler = proc_dointvec,
6857 .procname = "enhanced_dad",
6858 .data = &ipv6_devconf.enhanced_dad,
6859 .maxlen = sizeof(int),
6861 .proc_handler = proc_dointvec,
6864 .procname = "addr_gen_mode",
6865 .data = &ipv6_devconf.addr_gen_mode,
6866 .maxlen = sizeof(int),
6868 .proc_handler = addrconf_sysctl_addr_gen_mode,
6871 .procname = "disable_policy",
6872 .data = &ipv6_devconf.disable_policy,
6873 .maxlen = sizeof(int),
6875 .proc_handler = addrconf_sysctl_disable_policy,
6878 .procname = "ndisc_tclass",
6879 .data = &ipv6_devconf.ndisc_tclass,
6880 .maxlen = sizeof(int),
6882 .proc_handler = proc_dointvec_minmax,
6883 .extra1 = (void *)SYSCTL_ZERO,
6884 .extra2 = (void *)&two_five_five,
6891 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
6892 struct inet6_dev *idev, struct ipv6_devconf *p)
6895 struct ctl_table *table;
6896 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
6898 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
6902 for (i = 0; table[i].data; i++) {
6903 table[i].data += (char *)p - (char *)&ipv6_devconf;
6904 /* If one of these is already set, then it is not safe to
6905 * overwrite either of them: this makes proc_dointvec_minmax
6908 if (!table[i].extra1 && !table[i].extra2) {
6909 table[i].extra1 = idev; /* embedded; no ref */
6910 table[i].extra2 = net;
6914 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
6916 p->sysctl_header = register_net_sysctl(net, path, table);
6917 if (!p->sysctl_header)
6920 if (!strcmp(dev_name, "all"))
6921 ifindex = NETCONFA_IFINDEX_ALL;
6922 else if (!strcmp(dev_name, "default"))
6923 ifindex = NETCONFA_IFINDEX_DEFAULT;
6925 ifindex = idev->dev->ifindex;
6926 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
6936 static void __addrconf_sysctl_unregister(struct net *net,
6937 struct ipv6_devconf *p, int ifindex)
6939 struct ctl_table *table;
6941 if (!p->sysctl_header)
6944 table = p->sysctl_header->ctl_table_arg;
6945 unregister_net_sysctl_table(p->sysctl_header);
6946 p->sysctl_header = NULL;
6949 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
6952 static int addrconf_sysctl_register(struct inet6_dev *idev)
6956 if (!sysctl_dev_name_is_allowed(idev->dev->name))
6959 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
6960 &ndisc_ifinfo_sysctl_change);
6963 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
6966 neigh_sysctl_unregister(idev->nd_parms);
6971 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
6973 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf,
6974 idev->dev->ifindex);
6975 neigh_sysctl_unregister(idev->nd_parms);
6981 static int __net_init addrconf_init_net(struct net *net)
6984 struct ipv6_devconf *all, *dflt;
6986 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
6990 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
6992 goto err_alloc_dflt;
6994 if (IS_ENABLED(CONFIG_SYSCTL) &&
6995 sysctl_devconf_inherit_init_net == 1 && !net_eq(net, &init_net)) {
6996 memcpy(all, init_net.ipv6.devconf_all, sizeof(ipv6_devconf));
6997 memcpy(dflt, init_net.ipv6.devconf_dflt, sizeof(ipv6_devconf_dflt));
7000 /* these will be inherited by all namespaces */
7001 dflt->autoconf = ipv6_defaults.autoconf;
7002 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
7004 dflt->stable_secret.initialized = false;
7005 all->stable_secret.initialized = false;
7007 net->ipv6.devconf_all = all;
7008 net->ipv6.devconf_dflt = dflt;
7010 #ifdef CONFIG_SYSCTL
7011 err = __addrconf_sysctl_register(net, "all", NULL, all);
7015 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
7021 #ifdef CONFIG_SYSCTL
7023 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
7033 static void __net_exit addrconf_exit_net(struct net *net)
7035 #ifdef CONFIG_SYSCTL
7036 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt,
7037 NETCONFA_IFINDEX_DEFAULT);
7038 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all,
7039 NETCONFA_IFINDEX_ALL);
7041 kfree(net->ipv6.devconf_dflt);
7042 kfree(net->ipv6.devconf_all);
7045 static struct pernet_operations addrconf_ops = {
7046 .init = addrconf_init_net,
7047 .exit = addrconf_exit_net,
7050 static struct rtnl_af_ops inet6_ops __read_mostly = {
7052 .fill_link_af = inet6_fill_link_af,
7053 .get_link_af_size = inet6_get_link_af_size,
7054 .validate_link_af = inet6_validate_link_af,
7055 .set_link_af = inet6_set_link_af,
7059 * Init / cleanup code
7062 int __init addrconf_init(void)
7064 struct inet6_dev *idev;
7067 err = ipv6_addr_label_init();
7069 pr_crit("%s: cannot initialize default policy table: %d\n",
7074 err = register_pernet_subsys(&addrconf_ops);
7078 addrconf_wq = create_workqueue("ipv6_addrconf");
7084 /* The addrconf netdev notifier requires that loopback_dev
7085 * has it's ipv6 private information allocated and setup
7086 * before it can bring up and give link-local addresses
7087 * to other devices which are up.
7089 * Unfortunately, loopback_dev is not necessarily the first
7090 * entry in the global dev_base list of net devices. In fact,
7091 * it is likely to be the very last entry on that list.
7092 * So this causes the notifier registry below to try and
7093 * give link-local addresses to all devices besides loopback_dev
7094 * first, then loopback_dev, which cases all the non-loopback_dev
7095 * devices to fail to get a link-local address.
7097 * So, as a temporary fix, allocate the ipv6 structure for
7098 * loopback_dev first by hand.
7099 * Longer term, all of the dependencies ipv6 has upon the loopback
7100 * device and it being up should be removed.
7103 idev = ipv6_add_dev(init_net.loopback_dev);
7106 err = PTR_ERR(idev);
7110 ip6_route_init_special_entries();
7112 for (i = 0; i < IN6_ADDR_HSIZE; i++)
7113 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
7115 register_netdevice_notifier(&ipv6_dev_notf);
7119 rtnl_af_register(&inet6_ops);
7121 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK,
7122 NULL, inet6_dump_ifinfo, 0);
7126 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR,
7127 inet6_rtm_newaddr, NULL, 0);
7130 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR,
7131 inet6_rtm_deladdr, NULL, 0);
7134 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR,
7135 inet6_rtm_getaddr, inet6_dump_ifaddr,
7136 RTNL_FLAG_DOIT_UNLOCKED);
7139 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST,
7140 NULL, inet6_dump_ifmcaddr, 0);
7143 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST,
7144 NULL, inet6_dump_ifacaddr, 0);
7147 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF,
7148 inet6_netconf_get_devconf,
7149 inet6_netconf_dump_devconf,
7150 RTNL_FLAG_DOIT_UNLOCKED);
7153 err = ipv6_addr_label_rtnl_register();
7159 rtnl_unregister_all(PF_INET6);
7160 rtnl_af_unregister(&inet6_ops);
7161 unregister_netdevice_notifier(&ipv6_dev_notf);
7163 destroy_workqueue(addrconf_wq);
7165 unregister_pernet_subsys(&addrconf_ops);
7167 ipv6_addr_label_cleanup();
7172 void addrconf_cleanup(void)
7174 struct net_device *dev;
7177 unregister_netdevice_notifier(&ipv6_dev_notf);
7178 unregister_pernet_subsys(&addrconf_ops);
7179 ipv6_addr_label_cleanup();
7181 rtnl_af_unregister(&inet6_ops);
7185 /* clean dev list */
7186 for_each_netdev(&init_net, dev) {
7187 if (__in6_dev_get(dev) == NULL)
7189 addrconf_ifdown(dev, 1);
7191 addrconf_ifdown(init_net.loopback_dev, 2);
7196 spin_lock_bh(&addrconf_hash_lock);
7197 for (i = 0; i < IN6_ADDR_HSIZE; i++)
7198 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
7199 spin_unlock_bh(&addrconf_hash_lock);
7200 cancel_delayed_work(&addr_chk_work);
7203 destroy_workqueue(addrconf_wq);