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,
239 .rpl_seg_enabled = 0,
242 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
244 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
245 .mtu6 = IPV6_MIN_MTU,
247 .accept_redirects = 1,
249 .force_mld_version = 0,
250 .mldv1_unsolicited_report_interval = 10 * HZ,
251 .mldv2_unsolicited_report_interval = HZ,
253 .rtr_solicits = MAX_RTR_SOLICITATIONS,
254 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
255 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
256 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
258 .temp_valid_lft = TEMP_VALID_LIFETIME,
259 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
260 .regen_max_retry = REGEN_MAX_RETRY,
261 .max_desync_factor = MAX_DESYNC_FACTOR,
262 .max_addresses = IPV6_MAX_ADDRESSES,
263 .accept_ra_defrtr = 1,
264 .accept_ra_from_local = 0,
265 .accept_ra_min_hop_limit= 1,
266 .accept_ra_pinfo = 1,
267 #ifdef CONFIG_IPV6_ROUTER_PREF
268 .accept_ra_rtr_pref = 1,
269 .rtr_probe_interval = 60 * HZ,
270 #ifdef CONFIG_IPV6_ROUTE_INFO
271 .accept_ra_rt_info_min_plen = 0,
272 .accept_ra_rt_info_max_plen = 0,
276 .accept_source_route = 0, /* we do not accept RH0 by default. */
279 .suppress_frag_ndisc = 1,
282 .initialized = false,
284 .use_oif_addrs_only = 0,
285 .ignore_routes_with_linkdown = 0,
286 .keep_addr_on_down = 0,
288 #ifdef CONFIG_IPV6_SEG6_HMAC
289 .seg6_require_hmac = 0,
292 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
294 .rpl_seg_enabled = 0,
297 /* Check if link is ready: is it up and is a valid qdisc available */
298 static inline bool addrconf_link_ready(const struct net_device *dev)
300 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev);
303 static void addrconf_del_rs_timer(struct inet6_dev *idev)
305 if (del_timer(&idev->rs_timer))
309 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
311 if (cancel_delayed_work(&ifp->dad_work))
315 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
318 if (!timer_pending(&idev->rs_timer))
320 mod_timer(&idev->rs_timer, jiffies + when);
323 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
327 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay))
331 static int snmp6_alloc_dev(struct inet6_dev *idev)
335 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
336 if (!idev->stats.ipv6)
339 for_each_possible_cpu(i) {
340 struct ipstats_mib *addrconf_stats;
341 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
342 u64_stats_init(&addrconf_stats->syncp);
346 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
348 if (!idev->stats.icmpv6dev)
350 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
352 if (!idev->stats.icmpv6msgdev)
358 kfree(idev->stats.icmpv6dev);
360 free_percpu(idev->stats.ipv6);
365 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
367 struct inet6_dev *ndev;
372 if (dev->mtu < IPV6_MIN_MTU)
373 return ERR_PTR(-EINVAL);
375 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
379 rwlock_init(&ndev->lock);
381 INIT_LIST_HEAD(&ndev->addr_list);
382 timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0);
383 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
385 if (ndev->cnf.stable_secret.initialized)
386 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
388 ndev->cnf.mtu6 = dev->mtu;
389 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
390 if (!ndev->nd_parms) {
394 if (ndev->cnf.forwarding)
395 dev_disable_lro(dev);
396 /* We refer to the device */
399 if (snmp6_alloc_dev(ndev) < 0) {
400 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n",
402 neigh_parms_release(&nd_tbl, ndev->nd_parms);
408 if (snmp6_register_dev(ndev) < 0) {
409 netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n",
410 __func__, dev->name);
414 /* One reference from device. */
415 refcount_set(&ndev->refcnt, 1);
417 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
418 ndev->cnf.accept_dad = -1;
420 #if IS_ENABLED(CONFIG_IPV6_SIT)
421 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
422 pr_info("%s: Disabled Multicast RS\n", dev->name);
423 ndev->cnf.rtr_solicits = 0;
427 INIT_LIST_HEAD(&ndev->tempaddr_list);
428 ndev->desync_factor = U32_MAX;
429 if ((dev->flags&IFF_LOOPBACK) ||
430 dev->type == ARPHRD_TUNNEL ||
431 dev->type == ARPHRD_TUNNEL6 ||
432 dev->type == ARPHRD_SIT ||
433 dev->type == ARPHRD_NONE) {
434 ndev->cnf.use_tempaddr = -1;
436 ipv6_regen_rndid(ndev);
438 ndev->token = in6addr_any;
440 if (netif_running(dev) && addrconf_link_ready(dev))
441 ndev->if_flags |= IF_READY;
443 ipv6_mc_init_dev(ndev);
444 ndev->tstamp = jiffies;
445 err = addrconf_sysctl_register(ndev);
447 ipv6_mc_destroy_dev(ndev);
448 snmp6_unregister_dev(ndev);
451 /* protected by rtnl_lock */
452 rcu_assign_pointer(dev->ip6_ptr, ndev);
454 /* Join interface-local all-node multicast group */
455 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
457 /* Join all-node multicast group */
458 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
460 /* Join all-router multicast group if forwarding is set */
461 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
462 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
467 neigh_parms_release(&nd_tbl, ndev->nd_parms);
469 in6_dev_finish_destroy(ndev);
473 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
475 struct inet6_dev *idev;
479 idev = __in6_dev_get(dev);
481 idev = ipv6_add_dev(dev);
486 if (dev->flags&IFF_UP)
491 static int inet6_netconf_msgsize_devconf(int type)
493 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
494 + nla_total_size(4); /* NETCONFA_IFINDEX */
497 if (type == NETCONFA_ALL)
500 if (all || type == NETCONFA_FORWARDING)
501 size += nla_total_size(4);
502 #ifdef CONFIG_IPV6_MROUTE
503 if (all || type == NETCONFA_MC_FORWARDING)
504 size += nla_total_size(4);
506 if (all || type == NETCONFA_PROXY_NEIGH)
507 size += nla_total_size(4);
509 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
510 size += nla_total_size(4);
515 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
516 struct ipv6_devconf *devconf, u32 portid,
517 u32 seq, int event, unsigned int flags,
520 struct nlmsghdr *nlh;
521 struct netconfmsg *ncm;
524 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
529 if (type == NETCONFA_ALL)
532 ncm = nlmsg_data(nlh);
533 ncm->ncm_family = AF_INET6;
535 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
536 goto nla_put_failure;
541 if ((all || type == NETCONFA_FORWARDING) &&
542 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
543 goto nla_put_failure;
544 #ifdef CONFIG_IPV6_MROUTE
545 if ((all || type == NETCONFA_MC_FORWARDING) &&
546 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
547 devconf->mc_forwarding) < 0)
548 goto nla_put_failure;
550 if ((all || type == NETCONFA_PROXY_NEIGH) &&
551 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
552 goto nla_put_failure;
554 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
555 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
556 devconf->ignore_routes_with_linkdown) < 0)
557 goto nla_put_failure;
564 nlmsg_cancel(skb, nlh);
568 void inet6_netconf_notify_devconf(struct net *net, int event, int type,
569 int ifindex, struct ipv6_devconf *devconf)
574 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL);
578 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
581 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
582 WARN_ON(err == -EMSGSIZE);
586 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL);
589 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
592 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
593 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
594 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
595 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
596 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
599 static int inet6_netconf_valid_get_req(struct sk_buff *skb,
600 const struct nlmsghdr *nlh,
602 struct netlink_ext_ack *extack)
606 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) {
607 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf get request");
611 if (!netlink_strict_get_check(skb))
612 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg),
614 devconf_ipv6_policy, extack);
616 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg),
618 devconf_ipv6_policy, extack);
622 for (i = 0; i <= NETCONFA_MAX; i++) {
627 case NETCONFA_IFINDEX:
630 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request");
638 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
639 struct nlmsghdr *nlh,
640 struct netlink_ext_ack *extack)
642 struct net *net = sock_net(in_skb->sk);
643 struct nlattr *tb[NETCONFA_MAX+1];
644 struct inet6_dev *in6_dev = NULL;
645 struct net_device *dev = NULL;
647 struct ipv6_devconf *devconf;
651 err = inet6_netconf_valid_get_req(in_skb, nlh, tb, extack);
655 if (!tb[NETCONFA_IFINDEX])
659 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
661 case NETCONFA_IFINDEX_ALL:
662 devconf = net->ipv6.devconf_all;
664 case NETCONFA_IFINDEX_DEFAULT:
665 devconf = net->ipv6.devconf_dflt;
668 dev = dev_get_by_index(net, ifindex);
671 in6_dev = in6_dev_get(dev);
674 devconf = &in6_dev->cnf;
679 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL);
683 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
684 NETLINK_CB(in_skb).portid,
685 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
688 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
689 WARN_ON(err == -EMSGSIZE);
693 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
696 in6_dev_put(in6_dev);
702 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
703 struct netlink_callback *cb)
705 const struct nlmsghdr *nlh = cb->nlh;
706 struct net *net = sock_net(skb->sk);
709 struct net_device *dev;
710 struct inet6_dev *idev;
711 struct hlist_head *head;
713 if (cb->strict_check) {
714 struct netlink_ext_ack *extack = cb->extack;
715 struct netconfmsg *ncm;
717 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) {
718 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request");
722 if (nlmsg_attrlen(nlh, sizeof(*ncm))) {
723 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request");
729 s_idx = idx = cb->args[1];
731 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
733 head = &net->dev_index_head[h];
735 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
737 hlist_for_each_entry_rcu(dev, head, index_hlist) {
740 idev = __in6_dev_get(dev);
744 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
746 NETLINK_CB(cb->skb).portid,
754 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
760 if (h == NETDEV_HASHENTRIES) {
761 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
762 net->ipv6.devconf_all,
763 NETLINK_CB(cb->skb).portid,
765 RTM_NEWNETCONF, NLM_F_MULTI,
771 if (h == NETDEV_HASHENTRIES + 1) {
772 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
773 net->ipv6.devconf_dflt,
774 NETLINK_CB(cb->skb).portid,
776 RTM_NEWNETCONF, NLM_F_MULTI,
790 static void dev_forward_change(struct inet6_dev *idev)
792 struct net_device *dev;
793 struct inet6_ifaddr *ifa;
798 if (idev->cnf.forwarding)
799 dev_disable_lro(dev);
800 if (dev->flags & IFF_MULTICAST) {
801 if (idev->cnf.forwarding) {
802 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
803 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
804 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
806 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
807 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
808 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
812 list_for_each_entry(ifa, &idev->addr_list, if_list) {
813 if (ifa->flags&IFA_F_TENTATIVE)
815 if (idev->cnf.forwarding)
816 addrconf_join_anycast(ifa);
818 addrconf_leave_anycast(ifa);
820 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
822 dev->ifindex, &idev->cnf);
826 static void addrconf_forward_change(struct net *net, __s32 newf)
828 struct net_device *dev;
829 struct inet6_dev *idev;
831 for_each_netdev(net, dev) {
832 idev = __in6_dev_get(dev);
834 int changed = (!idev->cnf.forwarding) ^ (!newf);
835 idev->cnf.forwarding = newf;
837 dev_forward_change(idev);
842 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
848 return restart_syscall();
850 net = (struct net *)table->extra2;
854 if (p == &net->ipv6.devconf_dflt->forwarding) {
855 if ((!newf) ^ (!old))
856 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
858 NETCONFA_IFINDEX_DEFAULT,
859 net->ipv6.devconf_dflt);
864 if (p == &net->ipv6.devconf_all->forwarding) {
865 int old_dflt = net->ipv6.devconf_dflt->forwarding;
867 net->ipv6.devconf_dflt->forwarding = newf;
868 if ((!newf) ^ (!old_dflt))
869 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
871 NETCONFA_IFINDEX_DEFAULT,
872 net->ipv6.devconf_dflt);
874 addrconf_forward_change(net, newf);
875 if ((!newf) ^ (!old))
876 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
878 NETCONFA_IFINDEX_ALL,
879 net->ipv6.devconf_all);
880 } else if ((!newf) ^ (!old))
881 dev_forward_change((struct inet6_dev *)table->extra1);
885 rt6_purge_dflt_routers(net);
889 static void addrconf_linkdown_change(struct net *net, __s32 newf)
891 struct net_device *dev;
892 struct inet6_dev *idev;
894 for_each_netdev(net, dev) {
895 idev = __in6_dev_get(dev);
897 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
899 idev->cnf.ignore_routes_with_linkdown = newf;
901 inet6_netconf_notify_devconf(dev_net(dev),
903 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
910 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
916 return restart_syscall();
918 net = (struct net *)table->extra2;
922 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
923 if ((!newf) ^ (!old))
924 inet6_netconf_notify_devconf(net,
926 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
927 NETCONFA_IFINDEX_DEFAULT,
928 net->ipv6.devconf_dflt);
933 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
934 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
935 addrconf_linkdown_change(net, newf);
936 if ((!newf) ^ (!old))
937 inet6_netconf_notify_devconf(net,
939 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
940 NETCONFA_IFINDEX_ALL,
941 net->ipv6.devconf_all);
950 /* Nobody refers to this ifaddr, destroy it */
951 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
953 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
955 #ifdef NET_REFCNT_DEBUG
956 pr_debug("%s\n", __func__);
959 in6_dev_put(ifp->idev);
961 if (cancel_delayed_work(&ifp->dad_work))
962 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
965 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
966 pr_warn("Freeing alive inet6 address %p\n", ifp);
974 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
977 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
980 * Each device address list is sorted in order of scope -
981 * global before linklocal.
983 list_for_each(p, &idev->addr_list) {
984 struct inet6_ifaddr *ifa
985 = list_entry(p, struct inet6_ifaddr, if_list);
986 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
990 list_add_tail_rcu(&ifp->if_list, p);
993 static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr)
995 u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net);
997 return hash_32(val, IN6_ADDR_HSIZE_SHIFT);
1000 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1001 struct net_device *dev, unsigned int hash)
1003 struct inet6_ifaddr *ifp;
1005 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1006 if (!net_eq(dev_net(ifp->idev->dev), net))
1008 if (ipv6_addr_equal(&ifp->addr, addr)) {
1009 if (!dev || ifp->idev->dev == dev)
1016 static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa)
1018 unsigned int hash = inet6_addr_hash(dev_net(dev), &ifa->addr);
1021 spin_lock(&addrconf_hash_lock);
1023 /* Ignore adding duplicate addresses on an interface */
1024 if (ipv6_chk_same_addr(dev_net(dev), &ifa->addr, dev, hash)) {
1025 netdev_dbg(dev, "ipv6_add_addr: already assigned\n");
1028 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
1031 spin_unlock(&addrconf_hash_lock);
1036 /* On success it returns ifp with increased reference count */
1038 static struct inet6_ifaddr *
1039 ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg,
1040 bool can_block, struct netlink_ext_ack *extack)
1042 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC;
1043 int addr_type = ipv6_addr_type(cfg->pfx);
1044 struct net *net = dev_net(idev->dev);
1045 struct inet6_ifaddr *ifa = NULL;
1046 struct fib6_info *f6i = NULL;
1049 if (addr_type == IPV6_ADDR_ANY ||
1050 (addr_type & IPV6_ADDR_MULTICAST &&
1051 !(cfg->ifa_flags & IFA_F_MCAUTOJOIN)) ||
1052 (!(idev->dev->flags & IFF_LOOPBACK) &&
1053 !netif_is_l3_master(idev->dev) &&
1054 addr_type & IPV6_ADDR_LOOPBACK))
1055 return ERR_PTR(-EADDRNOTAVAIL);
1058 err = -ENODEV; /*XXX*/
1062 if (idev->cnf.disable_ipv6) {
1067 /* validator notifier needs to be blocking;
1068 * do not call in atomic context
1071 struct in6_validator_info i6vi = {
1072 .i6vi_addr = *cfg->pfx,
1077 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi);
1078 err = notifier_to_errno(err);
1083 ifa = kzalloc(sizeof(*ifa), gfp_flags);
1089 f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags);
1096 if (net->ipv6.devconf_all->disable_policy ||
1097 idev->cnf.disable_policy)
1098 f6i->dst_nopolicy = true;
1100 neigh_parms_data_state_setall(idev->nd_parms);
1102 ifa->addr = *cfg->pfx;
1104 ifa->peer_addr = *cfg->peer_pfx;
1106 spin_lock_init(&ifa->lock);
1107 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
1108 INIT_HLIST_NODE(&ifa->addr_lst);
1109 ifa->scope = cfg->scope;
1110 ifa->prefix_len = cfg->plen;
1111 ifa->rt_priority = cfg->rt_priority;
1112 ifa->flags = cfg->ifa_flags;
1113 /* No need to add the TENTATIVE flag for addresses with NODAD */
1114 if (!(cfg->ifa_flags & IFA_F_NODAD))
1115 ifa->flags |= IFA_F_TENTATIVE;
1116 ifa->valid_lft = cfg->valid_lft;
1117 ifa->prefered_lft = cfg->preferred_lft;
1118 ifa->cstamp = ifa->tstamp = jiffies;
1119 ifa->tokenized = false;
1127 refcount_set(&ifa->refcnt, 1);
1131 err = ipv6_add_addr_hash(idev->dev, ifa);
1133 rcu_read_unlock_bh();
1137 write_lock(&idev->lock);
1139 /* Add to inet6_dev unicast addr list. */
1140 ipv6_link_dev_addr(idev, ifa);
1142 if (ifa->flags&IFA_F_TEMPORARY) {
1143 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1148 write_unlock(&idev->lock);
1150 rcu_read_unlock_bh();
1152 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1154 if (unlikely(err < 0)) {
1155 fib6_info_release(f6i);
1159 in6_dev_put(ifa->idev);
1168 enum cleanup_prefix_rt_t {
1169 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1170 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1171 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1175 * Check, whether the prefix for ifp would still need a prefix route
1176 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1179 * 1) we don't purge prefix if address was not permanent.
1180 * prefix is managed by its own lifetime.
1181 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1182 * 3) if there are no addresses, delete prefix.
1183 * 4) if there are still other permanent address(es),
1184 * corresponding prefix is still permanent.
1185 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1186 * don't purge the prefix, assume user space is managing it.
1187 * 6) otherwise, update prefix lifetime to the
1188 * longest valid lifetime among the corresponding
1189 * addresses on the device.
1190 * Note: subsequent RA will update lifetime.
1192 static enum cleanup_prefix_rt_t
1193 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1195 struct inet6_ifaddr *ifa;
1196 struct inet6_dev *idev = ifp->idev;
1197 unsigned long lifetime;
1198 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1202 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1205 if (ifa->prefix_len != ifp->prefix_len ||
1206 !ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1209 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1210 return CLEANUP_PREFIX_RT_NOP;
1212 action = CLEANUP_PREFIX_RT_EXPIRE;
1214 spin_lock(&ifa->lock);
1216 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1218 * Note: Because this address is
1219 * not permanent, lifetime <
1220 * LONG_MAX / HZ here.
1222 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1223 *expires = ifa->tstamp + lifetime * HZ;
1224 spin_unlock(&ifa->lock);
1231 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires,
1232 bool del_rt, bool del_peer)
1234 struct fib6_info *f6i;
1236 f6i = addrconf_get_prefix_route(del_peer ? &ifp->peer_addr : &ifp->addr,
1238 ifp->idev->dev, 0, RTF_DEFAULT, true);
1241 ip6_del_rt(dev_net(ifp->idev->dev), f6i);
1243 if (!(f6i->fib6_flags & RTF_EXPIRES))
1244 fib6_set_expires(f6i, expires);
1245 fib6_info_release(f6i);
1251 /* This function wants to get referenced ifp and releases it before return */
1253 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1256 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1257 unsigned long expires;
1261 spin_lock_bh(&ifp->lock);
1263 ifp->state = INET6_IFADDR_STATE_DEAD;
1264 spin_unlock_bh(&ifp->lock);
1266 if (state == INET6_IFADDR_STATE_DEAD)
1269 spin_lock_bh(&addrconf_hash_lock);
1270 hlist_del_init_rcu(&ifp->addr_lst);
1271 spin_unlock_bh(&addrconf_hash_lock);
1273 write_lock_bh(&ifp->idev->lock);
1275 if (ifp->flags&IFA_F_TEMPORARY) {
1276 list_del(&ifp->tmp_list);
1278 in6_ifa_put(ifp->ifpub);
1284 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1285 action = check_cleanup_prefix_route(ifp, &expires);
1287 list_del_rcu(&ifp->if_list);
1290 write_unlock_bh(&ifp->idev->lock);
1292 addrconf_del_dad_work(ifp);
1294 ipv6_ifa_notify(RTM_DELADDR, ifp);
1296 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1298 if (action != CLEANUP_PREFIX_RT_NOP) {
1299 cleanup_prefix_route(ifp, expires,
1300 action == CLEANUP_PREFIX_RT_DEL, false);
1303 /* clean up prefsrc entries */
1304 rt6_remove_prefsrc(ifp);
1309 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp,
1310 struct inet6_ifaddr *ift,
1313 struct inet6_dev *idev = ifp->idev;
1314 struct in6_addr addr, *tmpaddr;
1315 unsigned long tmp_tstamp, age;
1316 unsigned long regen_advance;
1317 struct ifa6_config cfg;
1319 unsigned long now = jiffies;
1320 long max_desync_factor;
1321 s32 cnf_temp_preferred_lft;
1323 write_lock_bh(&idev->lock);
1325 spin_lock_bh(&ift->lock);
1326 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1327 spin_unlock_bh(&ift->lock);
1334 if (idev->cnf.use_tempaddr <= 0) {
1335 write_unlock_bh(&idev->lock);
1336 pr_info("%s: use_tempaddr is disabled\n", __func__);
1341 spin_lock_bh(&ifp->lock);
1342 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1343 idev->cnf.use_tempaddr = -1; /*XXX*/
1344 spin_unlock_bh(&ifp->lock);
1345 write_unlock_bh(&idev->lock);
1346 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1353 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1354 ipv6_try_regen_rndid(idev, tmpaddr);
1355 memcpy(&addr.s6_addr[8], idev->rndid, 8);
1356 age = (now - ifp->tstamp) / HZ;
1358 regen_advance = idev->cnf.regen_max_retry *
1359 idev->cnf.dad_transmits *
1360 max(NEIGH_VAR(idev->nd_parms, RETRANS_TIME), HZ/100) / HZ;
1362 /* recalculate max_desync_factor each time and update
1363 * idev->desync_factor if it's larger
1365 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
1366 max_desync_factor = min_t(__u32,
1367 idev->cnf.max_desync_factor,
1368 cnf_temp_preferred_lft - regen_advance);
1370 if (unlikely(idev->desync_factor > max_desync_factor)) {
1371 if (max_desync_factor > 0) {
1372 get_random_bytes(&idev->desync_factor,
1373 sizeof(idev->desync_factor));
1374 idev->desync_factor %= max_desync_factor;
1376 idev->desync_factor = 0;
1380 memset(&cfg, 0, sizeof(cfg));
1381 cfg.valid_lft = min_t(__u32, ifp->valid_lft,
1382 idev->cnf.temp_valid_lft + age);
1383 cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor;
1384 cfg.preferred_lft = min_t(__u32, ifp->prefered_lft, cfg.preferred_lft);
1386 cfg.plen = ifp->prefix_len;
1387 tmp_tstamp = ifp->tstamp;
1388 spin_unlock_bh(&ifp->lock);
1390 write_unlock_bh(&idev->lock);
1392 /* A temporary address is created only if this calculated Preferred
1393 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1394 * an implementation must not create a temporary address with a zero
1395 * Preferred Lifetime.
1396 * Use age calculation as in addrconf_verify to avoid unnecessary
1397 * temporary addresses being generated.
1399 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1400 if (cfg.preferred_lft <= regen_advance + age) {
1407 cfg.ifa_flags = IFA_F_TEMPORARY;
1408 /* set in addrconf_prefix_rcv() */
1409 if (ifp->flags & IFA_F_OPTIMISTIC)
1410 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
1413 cfg.scope = ipv6_addr_scope(cfg.pfx);
1415 ift = ipv6_add_addr(idev, &cfg, block, NULL);
1419 pr_info("%s: retry temporary address regeneration\n", __func__);
1421 write_lock_bh(&idev->lock);
1425 spin_lock_bh(&ift->lock);
1428 ift->tstamp = tmp_tstamp;
1429 spin_unlock_bh(&ift->lock);
1431 addrconf_dad_start(ift);
1439 * Choose an appropriate source address (RFC3484)
1442 IPV6_SADDR_RULE_INIT = 0,
1443 IPV6_SADDR_RULE_LOCAL,
1444 IPV6_SADDR_RULE_SCOPE,
1445 IPV6_SADDR_RULE_PREFERRED,
1446 #ifdef CONFIG_IPV6_MIP6
1447 IPV6_SADDR_RULE_HOA,
1449 IPV6_SADDR_RULE_OIF,
1450 IPV6_SADDR_RULE_LABEL,
1451 IPV6_SADDR_RULE_PRIVACY,
1452 IPV6_SADDR_RULE_ORCHID,
1453 IPV6_SADDR_RULE_PREFIX,
1454 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1455 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1460 struct ipv6_saddr_score {
1463 struct inet6_ifaddr *ifa;
1464 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1469 struct ipv6_saddr_dst {
1470 const struct in6_addr *addr;
1477 static inline int ipv6_saddr_preferred(int type)
1479 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1484 static bool ipv6_use_optimistic_addr(struct net *net,
1485 struct inet6_dev *idev)
1487 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1490 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1492 if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic)
1501 static bool ipv6_allow_optimistic_dad(struct net *net,
1502 struct inet6_dev *idev)
1504 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1507 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1516 static int ipv6_get_saddr_eval(struct net *net,
1517 struct ipv6_saddr_score *score,
1518 struct ipv6_saddr_dst *dst,
1523 if (i <= score->rule) {
1525 case IPV6_SADDR_RULE_SCOPE:
1526 ret = score->scopedist;
1528 case IPV6_SADDR_RULE_PREFIX:
1529 ret = score->matchlen;
1532 ret = !!test_bit(i, score->scorebits);
1538 case IPV6_SADDR_RULE_INIT:
1539 /* Rule 0: remember if hiscore is not ready yet */
1542 case IPV6_SADDR_RULE_LOCAL:
1543 /* Rule 1: Prefer same address */
1544 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1546 case IPV6_SADDR_RULE_SCOPE:
1547 /* Rule 2: Prefer appropriate scope
1552 * ---+--+-+---> scope
1554 * | d is scope of the destination.
1556 * | \ <- smaller scope is better if
1557 * B-15 | \ if scope is enough for destination.
1558 * | ret = B - scope (-1 <= scope >= d <= 15).
1560 * |/ <- greater is better
1561 * -C / if scope is not enough for destination.
1562 * /| ret = scope - C (-1 <= d < scope <= 15).
1564 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1565 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1566 * Assume B = 0 and we get C > 29.
1568 ret = __ipv6_addr_src_scope(score->addr_type);
1569 if (ret >= dst->scope)
1572 ret -= 128; /* 30 is enough */
1573 score->scopedist = ret;
1575 case IPV6_SADDR_RULE_PREFERRED:
1577 /* Rule 3: Avoid deprecated and optimistic addresses */
1578 u8 avoid = IFA_F_DEPRECATED;
1580 if (!ipv6_use_optimistic_addr(net, score->ifa->idev))
1581 avoid |= IFA_F_OPTIMISTIC;
1582 ret = ipv6_saddr_preferred(score->addr_type) ||
1583 !(score->ifa->flags & avoid);
1586 #ifdef CONFIG_IPV6_MIP6
1587 case IPV6_SADDR_RULE_HOA:
1589 /* Rule 4: Prefer home address */
1590 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1591 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1595 case IPV6_SADDR_RULE_OIF:
1596 /* Rule 5: Prefer outgoing interface */
1597 ret = (!dst->ifindex ||
1598 dst->ifindex == score->ifa->idev->dev->ifindex);
1600 case IPV6_SADDR_RULE_LABEL:
1601 /* Rule 6: Prefer matching label */
1602 ret = ipv6_addr_label(net,
1603 &score->ifa->addr, score->addr_type,
1604 score->ifa->idev->dev->ifindex) == dst->label;
1606 case IPV6_SADDR_RULE_PRIVACY:
1608 /* Rule 7: Prefer public address
1609 * Note: prefer temporary address if use_tempaddr >= 2
1611 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1612 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1613 score->ifa->idev->cnf.use_tempaddr >= 2;
1614 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1617 case IPV6_SADDR_RULE_ORCHID:
1618 /* Rule 8-: Prefer ORCHID vs ORCHID or
1619 * non-ORCHID vs non-ORCHID
1621 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1622 ipv6_addr_orchid(dst->addr));
1624 case IPV6_SADDR_RULE_PREFIX:
1625 /* Rule 8: Use longest matching prefix */
1626 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1627 if (ret > score->ifa->prefix_len)
1628 ret = score->ifa->prefix_len;
1629 score->matchlen = ret;
1631 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1632 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1633 /* Optimistic addresses still have lower precedence than other
1634 * preferred addresses.
1636 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1644 __set_bit(i, score->scorebits);
1650 static int __ipv6_dev_get_saddr(struct net *net,
1651 struct ipv6_saddr_dst *dst,
1652 struct inet6_dev *idev,
1653 struct ipv6_saddr_score *scores,
1656 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1658 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) {
1662 * - Tentative Address (RFC2462 section 5.4)
1663 * - A tentative address is not considered
1664 * "assigned to an interface" in the traditional
1665 * sense, unless it is also flagged as optimistic.
1666 * - Candidate Source Address (section 4)
1667 * - In any case, anycast addresses, multicast
1668 * addresses, and the unspecified address MUST
1669 * NOT be included in a candidate set.
1671 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1672 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1675 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1677 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1678 score->addr_type & IPV6_ADDR_MULTICAST)) {
1679 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1685 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1687 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1688 int minihiscore, miniscore;
1690 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1691 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1693 if (minihiscore > miniscore) {
1694 if (i == IPV6_SADDR_RULE_SCOPE &&
1695 score->scopedist > 0) {
1698 * each remaining entry
1699 * has too small (not enough)
1700 * scope, because ifa entries
1701 * are sorted by their scope
1707 } else if (minihiscore < miniscore) {
1708 swap(hiscore, score);
1709 hiscore_idx = 1 - hiscore_idx;
1711 /* restore our iterator */
1712 score->ifa = hiscore->ifa;
1722 static int ipv6_get_saddr_master(struct net *net,
1723 const struct net_device *dst_dev,
1724 const struct net_device *master,
1725 struct ipv6_saddr_dst *dst,
1726 struct ipv6_saddr_score *scores,
1729 struct inet6_dev *idev;
1731 idev = __in6_dev_get(dst_dev);
1733 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1734 scores, hiscore_idx);
1736 idev = __in6_dev_get(master);
1738 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1739 scores, hiscore_idx);
1744 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1745 const struct in6_addr *daddr, unsigned int prefs,
1746 struct in6_addr *saddr)
1748 struct ipv6_saddr_score scores[2], *hiscore;
1749 struct ipv6_saddr_dst dst;
1750 struct inet6_dev *idev;
1751 struct net_device *dev;
1753 bool use_oif_addr = false;
1754 int hiscore_idx = 0;
1757 dst_type = __ipv6_addr_type(daddr);
1759 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1760 dst.scope = __ipv6_addr_src_scope(dst_type);
1761 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1764 scores[hiscore_idx].rule = -1;
1765 scores[hiscore_idx].ifa = NULL;
1769 /* Candidate Source Address (section 4)
1770 * - multicast and link-local destination address,
1771 * the set of candidate source address MUST only
1772 * include addresses assigned to interfaces
1773 * belonging to the same link as the outgoing
1775 * (- For site-local destination addresses, the
1776 * set of candidate source addresses MUST only
1777 * include addresses assigned to interfaces
1778 * belonging to the same site as the outgoing
1780 * - "It is RECOMMENDED that the candidate source addresses
1781 * be the set of unicast addresses assigned to the
1782 * interface that will be used to send to the destination
1783 * (the 'outgoing' interface)." (RFC 6724)
1786 idev = __in6_dev_get(dst_dev);
1787 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1788 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1789 (idev && idev->cnf.use_oif_addrs_only)) {
1790 use_oif_addr = true;
1796 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1798 const struct net_device *master;
1801 /* if dst_dev exists and is enslaved to an L3 device, then
1802 * prefer addresses from dst_dev and then the master over
1803 * any other enslaved devices in the L3 domain.
1805 master = l3mdev_master_dev_rcu(dst_dev);
1807 master_idx = master->ifindex;
1809 hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1811 scores, hiscore_idx);
1813 if (scores[hiscore_idx].ifa)
1817 for_each_netdev_rcu(net, dev) {
1818 /* only consider addresses on devices in the
1821 if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1823 idev = __in6_dev_get(dev);
1826 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1831 hiscore = &scores[hiscore_idx];
1833 ret = -EADDRNOTAVAIL;
1835 *saddr = hiscore->ifa->addr;
1840 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1842 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1845 struct inet6_ifaddr *ifp;
1846 int err = -EADDRNOTAVAIL;
1848 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1849 if (ifp->scope > IFA_LINK)
1851 if (ifp->scope == IFA_LINK &&
1852 !(ifp->flags & banned_flags)) {
1861 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1864 struct inet6_dev *idev;
1865 int err = -EADDRNOTAVAIL;
1868 idev = __in6_dev_get(dev);
1870 read_lock_bh(&idev->lock);
1871 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1872 read_unlock_bh(&idev->lock);
1878 static int ipv6_count_addresses(const struct inet6_dev *idev)
1880 const struct inet6_ifaddr *ifp;
1884 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list)
1890 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1891 const struct net_device *dev, int strict)
1893 return ipv6_chk_addr_and_flags(net, addr, dev, !dev,
1894 strict, IFA_F_TENTATIVE);
1896 EXPORT_SYMBOL(ipv6_chk_addr);
1898 /* device argument is used to find the L3 domain of interest. If
1899 * skip_dev_check is set, then the ifp device is not checked against
1900 * the passed in dev argument. So the 2 cases for addresses checks are:
1901 * 1. does the address exist in the L3 domain that dev is part of
1902 * (skip_dev_check = true), or
1904 * 2. does the address exist on the specific device
1905 * (skip_dev_check = false)
1907 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1908 const struct net_device *dev, bool skip_dev_check,
1909 int strict, u32 banned_flags)
1911 unsigned int hash = inet6_addr_hash(net, addr);
1912 const struct net_device *l3mdev;
1913 struct inet6_ifaddr *ifp;
1918 l3mdev = l3mdev_master_dev_rcu(dev);
1922 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1923 if (!net_eq(dev_net(ifp->idev->dev), net))
1926 if (l3mdev_master_dev_rcu(ifp->idev->dev) != l3mdev)
1929 /* Decouple optimistic from tentative for evaluation here.
1930 * Ban optimistic addresses explicitly, when required.
1932 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1933 ? (ifp->flags&~IFA_F_TENTATIVE)
1935 if (ipv6_addr_equal(&ifp->addr, addr) &&
1936 !(ifp_flags&banned_flags) &&
1937 (!dev || ifp->idev->dev == dev ||
1938 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1947 EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1950 /* Compares an address/prefix_len with addresses on device @dev.
1951 * If one is found it returns true.
1953 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1954 const unsigned int prefix_len, struct net_device *dev)
1956 const struct inet6_ifaddr *ifa;
1957 const struct inet6_dev *idev;
1961 idev = __in6_dev_get(dev);
1963 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
1964 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1973 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1975 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1977 const struct inet6_ifaddr *ifa;
1978 const struct inet6_dev *idev;
1983 idev = __in6_dev_get(dev);
1985 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
1986 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1995 EXPORT_SYMBOL(ipv6_chk_prefix);
1997 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1998 struct net_device *dev, int strict)
2000 unsigned int hash = inet6_addr_hash(net, addr);
2001 struct inet6_ifaddr *ifp, *result = NULL;
2004 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
2005 if (!net_eq(dev_net(ifp->idev->dev), net))
2007 if (ipv6_addr_equal(&ifp->addr, addr)) {
2008 if (!dev || ifp->idev->dev == dev ||
2009 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
2021 /* Gets referenced address, destroys ifaddr */
2023 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
2026 ifp->flags |= IFA_F_DADFAILED;
2028 if (ifp->flags&IFA_F_TEMPORARY) {
2029 struct inet6_ifaddr *ifpub;
2030 spin_lock_bh(&ifp->lock);
2033 in6_ifa_hold(ifpub);
2034 spin_unlock_bh(&ifp->lock);
2035 ipv6_create_tempaddr(ifpub, ifp, true);
2038 spin_unlock_bh(&ifp->lock);
2041 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) {
2042 spin_lock_bh(&ifp->lock);
2043 addrconf_del_dad_work(ifp);
2044 ifp->flags |= IFA_F_TENTATIVE;
2046 ifp->flags &= ~IFA_F_OPTIMISTIC;
2047 spin_unlock_bh(&ifp->lock);
2049 ipv6_ifa_notify(0, ifp);
2056 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
2060 spin_lock_bh(&ifp->lock);
2061 if (ifp->state == INET6_IFADDR_STATE_DAD) {
2062 ifp->state = INET6_IFADDR_STATE_POSTDAD;
2065 spin_unlock_bh(&ifp->lock);
2070 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp)
2072 struct inet6_dev *idev = ifp->idev;
2073 struct net *net = dev_net(ifp->idev->dev);
2075 if (addrconf_dad_end(ifp)) {
2080 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n",
2081 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source);
2083 spin_lock_bh(&ifp->lock);
2085 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
2086 struct in6_addr new_addr;
2087 struct inet6_ifaddr *ifp2;
2088 int retries = ifp->stable_privacy_retry + 1;
2089 struct ifa6_config cfg = {
2091 .plen = ifp->prefix_len,
2092 .ifa_flags = ifp->flags,
2093 .valid_lft = ifp->valid_lft,
2094 .preferred_lft = ifp->prefered_lft,
2095 .scope = ifp->scope,
2098 if (retries > net->ipv6.sysctl.idgen_retries) {
2099 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
2100 ifp->idev->dev->name);
2104 new_addr = ifp->addr;
2105 if (ipv6_generate_stable_address(&new_addr, retries,
2109 spin_unlock_bh(&ifp->lock);
2111 if (idev->cnf.max_addresses &&
2112 ipv6_count_addresses(idev) >=
2113 idev->cnf.max_addresses)
2116 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
2117 ifp->idev->dev->name);
2119 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL);
2123 spin_lock_bh(&ifp2->lock);
2124 ifp2->stable_privacy_retry = retries;
2125 ifp2->state = INET6_IFADDR_STATE_PREDAD;
2126 spin_unlock_bh(&ifp2->lock);
2128 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
2131 spin_lock_bh(&ifp->lock);
2135 /* transition from _POSTDAD to _ERRDAD */
2136 ifp->state = INET6_IFADDR_STATE_ERRDAD;
2137 spin_unlock_bh(&ifp->lock);
2139 addrconf_mod_dad_work(ifp, 0);
2143 /* Join to solicited addr multicast group.
2144 * caller must hold RTNL */
2145 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
2147 struct in6_addr maddr;
2149 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2152 addrconf_addr_solict_mult(addr, &maddr);
2153 ipv6_dev_mc_inc(dev, &maddr);
2156 /* caller must hold RTNL */
2157 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
2159 struct in6_addr maddr;
2161 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2164 addrconf_addr_solict_mult(addr, &maddr);
2165 __ipv6_dev_mc_dec(idev, &maddr);
2168 /* caller must hold RTNL */
2169 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
2171 struct in6_addr addr;
2173 if (ifp->prefix_len >= 127) /* RFC 6164 */
2175 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2176 if (ipv6_addr_any(&addr))
2178 __ipv6_dev_ac_inc(ifp->idev, &addr);
2181 /* caller must hold RTNL */
2182 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
2184 struct in6_addr addr;
2186 if (ifp->prefix_len >= 127) /* RFC 6164 */
2188 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2189 if (ipv6_addr_any(&addr))
2191 __ipv6_dev_ac_dec(ifp->idev, &addr);
2194 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev)
2196 switch (dev->addr_len) {
2198 memcpy(eui, dev->dev_addr, 3);
2201 memcpy(eui + 5, dev->dev_addr + 3, 3);
2203 case EUI64_ADDR_LEN:
2204 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2214 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2216 union fwnet_hwaddr *ha;
2218 if (dev->addr_len != FWNET_ALEN)
2221 ha = (union fwnet_hwaddr *)dev->dev_addr;
2223 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2228 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2230 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2231 if (dev->addr_len != ARCNET_ALEN)
2234 eui[7] = *(u8 *)dev->dev_addr;
2238 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2240 if (dev->addr_len != INFINIBAND_ALEN)
2242 memcpy(eui, dev->dev_addr + 12, 8);
2247 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
2251 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2252 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2253 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2254 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2255 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2256 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2260 memcpy(eui + 4, &addr, 4);
2264 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2266 if (dev->priv_flags & IFF_ISATAP)
2267 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2271 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2273 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2276 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2278 memcpy(eui, dev->perm_addr, 3);
2279 memcpy(eui + 5, dev->perm_addr + 3, 3);
2286 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2288 switch (dev->type) {
2291 return addrconf_ifid_eui48(eui, dev);
2293 return addrconf_ifid_arcnet(eui, dev);
2294 case ARPHRD_INFINIBAND:
2295 return addrconf_ifid_infiniband(eui, dev);
2297 return addrconf_ifid_sit(eui, dev);
2300 return addrconf_ifid_gre(eui, dev);
2301 case ARPHRD_6LOWPAN:
2302 return addrconf_ifid_6lowpan(eui, dev);
2303 case ARPHRD_IEEE1394:
2304 return addrconf_ifid_ieee1394(eui, dev);
2305 case ARPHRD_TUNNEL6:
2308 return addrconf_ifid_ip6tnl(eui, dev);
2313 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2316 struct inet6_ifaddr *ifp;
2318 read_lock_bh(&idev->lock);
2319 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2320 if (ifp->scope > IFA_LINK)
2322 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2323 memcpy(eui, ifp->addr.s6_addr+8, 8);
2328 read_unlock_bh(&idev->lock);
2332 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
2333 static void ipv6_regen_rndid(struct inet6_dev *idev)
2336 get_random_bytes(idev->rndid, sizeof(idev->rndid));
2337 idev->rndid[0] &= ~0x02;
2340 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2341 * check if generated address is not inappropriate
2343 * - Reserved subnet anycast (RFC 2526)
2344 * 11111101 11....11 1xxxxxxx
2345 * - ISATAP (RFC4214) 6.1
2346 * 00-00-5E-FE-xx-xx-xx-xx
2348 * - XXX: already assigned to an address on the device
2350 if (idev->rndid[0] == 0xfd &&
2351 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2352 (idev->rndid[7]&0x80))
2354 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2355 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2357 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2362 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
2364 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
2365 ipv6_regen_rndid(idev);
2373 addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric,
2374 struct net_device *dev, unsigned long expires,
2375 u32 flags, gfp_t gfp_flags)
2377 struct fib6_config cfg = {
2378 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
2379 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF,
2380 .fc_ifindex = dev->ifindex,
2381 .fc_expires = expires,
2383 .fc_flags = RTF_UP | flags,
2384 .fc_nlinfo.nl_net = dev_net(dev),
2385 .fc_protocol = RTPROT_KERNEL,
2386 .fc_type = RTN_UNICAST,
2391 /* Prevent useless cloning on PtP SIT.
2392 This thing is done here expecting that the whole
2393 class of non-broadcast devices need not cloning.
2395 #if IS_ENABLED(CONFIG_IPV6_SIT)
2396 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2397 cfg.fc_flags |= RTF_NONEXTHOP;
2400 ip6_route_add(&cfg, gfp_flags, NULL);
2404 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2406 const struct net_device *dev,
2407 u32 flags, u32 noflags,
2410 struct fib6_node *fn;
2411 struct fib6_info *rt = NULL;
2412 struct fib6_table *table;
2413 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
2415 table = fib6_get_table(dev_net(dev), tb_id);
2420 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true);
2424 for_each_fib6_node_rt_rcu(fn) {
2425 /* prefix routes only use builtin fib6_nh */
2429 if (rt->fib6_nh->fib_nh_dev->ifindex != dev->ifindex)
2431 if (no_gw && rt->fib6_nh->fib_nh_gw_family)
2433 if ((rt->fib6_flags & flags) != flags)
2435 if ((rt->fib6_flags & noflags) != 0)
2437 if (!fib6_info_hold_safe(rt))
2447 /* Create "default" multicast route to the interface */
2449 static void addrconf_add_mroute(struct net_device *dev)
2451 struct fib6_config cfg = {
2452 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2453 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2454 .fc_ifindex = dev->ifindex,
2457 .fc_type = RTN_UNICAST,
2458 .fc_nlinfo.nl_net = dev_net(dev),
2461 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2463 ip6_route_add(&cfg, GFP_KERNEL, NULL);
2466 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2468 struct inet6_dev *idev;
2472 idev = ipv6_find_idev(dev);
2476 if (idev->cnf.disable_ipv6)
2477 return ERR_PTR(-EACCES);
2479 /* Add default multicast route */
2480 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
2481 addrconf_add_mroute(dev);
2486 static void manage_tempaddrs(struct inet6_dev *idev,
2487 struct inet6_ifaddr *ifp,
2488 __u32 valid_lft, __u32 prefered_lft,
2489 bool create, unsigned long now)
2492 struct inet6_ifaddr *ift;
2494 read_lock_bh(&idev->lock);
2495 /* update all temporary addresses in the list */
2496 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2497 int age, max_valid, max_prefered;
2499 if (ifp != ift->ifpub)
2502 /* RFC 4941 section 3.3:
2503 * If a received option will extend the lifetime of a public
2504 * address, the lifetimes of temporary addresses should
2505 * be extended, subject to the overall constraint that no
2506 * temporary addresses should ever remain "valid" or "preferred"
2507 * for a time longer than (TEMP_VALID_LIFETIME) or
2508 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2510 age = (now - ift->cstamp) / HZ;
2511 max_valid = idev->cnf.temp_valid_lft - age;
2515 max_prefered = idev->cnf.temp_prefered_lft -
2516 idev->desync_factor - age;
2517 if (max_prefered < 0)
2520 if (valid_lft > max_valid)
2521 valid_lft = max_valid;
2523 if (prefered_lft > max_prefered)
2524 prefered_lft = max_prefered;
2526 spin_lock(&ift->lock);
2528 ift->valid_lft = valid_lft;
2529 ift->prefered_lft = prefered_lft;
2531 if (prefered_lft > 0)
2532 ift->flags &= ~IFA_F_DEPRECATED;
2534 spin_unlock(&ift->lock);
2535 if (!(flags&IFA_F_TENTATIVE))
2536 ipv6_ifa_notify(0, ift);
2539 if ((create || list_empty(&idev->tempaddr_list)) &&
2540 idev->cnf.use_tempaddr > 0) {
2541 /* When a new public address is created as described
2542 * in [ADDRCONF], also create a new temporary address.
2543 * Also create a temporary address if it's enabled but
2544 * no temporary address currently exists.
2546 read_unlock_bh(&idev->lock);
2547 ipv6_create_tempaddr(ifp, NULL, false);
2549 read_unlock_bh(&idev->lock);
2553 static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2555 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2556 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2559 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2560 const struct prefix_info *pinfo,
2561 struct inet6_dev *in6_dev,
2562 const struct in6_addr *addr, int addr_type,
2563 u32 addr_flags, bool sllao, bool tokenized,
2564 __u32 valid_lft, u32 prefered_lft)
2566 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2567 int create = 0, update_lft = 0;
2569 if (!ifp && valid_lft) {
2570 int max_addresses = in6_dev->cnf.max_addresses;
2571 struct ifa6_config cfg = {
2573 .plen = pinfo->prefix_len,
2574 .ifa_flags = addr_flags,
2575 .valid_lft = valid_lft,
2576 .preferred_lft = prefered_lft,
2577 .scope = addr_type & IPV6_ADDR_SCOPE_MASK,
2580 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2581 if ((net->ipv6.devconf_all->optimistic_dad ||
2582 in6_dev->cnf.optimistic_dad) &&
2583 !net->ipv6.devconf_all->forwarding && sllao)
2584 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
2587 /* Do not allow to create too much of autoconfigured
2588 * addresses; this would be too easy way to crash kernel.
2590 if (!max_addresses ||
2591 ipv6_count_addresses(in6_dev) < max_addresses)
2592 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL);
2594 if (IS_ERR_OR_NULL(ifp))
2598 spin_lock_bh(&ifp->lock);
2599 ifp->flags |= IFA_F_MANAGETEMPADDR;
2600 ifp->cstamp = jiffies;
2601 ifp->tokenized = tokenized;
2602 spin_unlock_bh(&ifp->lock);
2603 addrconf_dad_start(ifp);
2611 /* update lifetime (RFC2462 5.5.3 e) */
2612 spin_lock_bh(&ifp->lock);
2614 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2615 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2618 if (!create && stored_lft) {
2619 const u32 minimum_lft = min_t(u32,
2620 stored_lft, MIN_VALID_LIFETIME);
2621 valid_lft = max(valid_lft, minimum_lft);
2623 /* RFC4862 Section 5.5.3e:
2624 * "Note that the preferred lifetime of the
2625 * corresponding address is always reset to
2626 * the Preferred Lifetime in the received
2627 * Prefix Information option, regardless of
2628 * whether the valid lifetime is also reset or
2631 * So we should always update prefered_lft here.
2637 ifp->valid_lft = valid_lft;
2638 ifp->prefered_lft = prefered_lft;
2641 ifp->flags &= ~IFA_F_DEPRECATED;
2642 spin_unlock_bh(&ifp->lock);
2644 if (!(flags&IFA_F_TENTATIVE))
2645 ipv6_ifa_notify(0, ifp);
2647 spin_unlock_bh(&ifp->lock);
2649 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2658 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
2660 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2662 struct prefix_info *pinfo;
2667 struct inet6_dev *in6_dev;
2668 struct net *net = dev_net(dev);
2670 pinfo = (struct prefix_info *) opt;
2672 if (len < sizeof(struct prefix_info)) {
2673 netdev_dbg(dev, "addrconf: prefix option too short\n");
2678 * Validation checks ([ADDRCONF], page 19)
2681 addr_type = ipv6_addr_type(&pinfo->prefix);
2683 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2686 valid_lft = ntohl(pinfo->valid);
2687 prefered_lft = ntohl(pinfo->prefered);
2689 if (prefered_lft > valid_lft) {
2690 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2694 in6_dev = in6_dev_get(dev);
2697 net_dbg_ratelimited("addrconf: device %s not configured\n",
2703 * Two things going on here:
2704 * 1) Add routes for on-link prefixes
2705 * 2) Configure prefixes with the auto flag set
2708 if (pinfo->onlink) {
2709 struct fib6_info *rt;
2710 unsigned long rt_expires;
2712 /* Avoid arithmetic overflow. Really, we could
2713 * save rt_expires in seconds, likely valid_lft,
2714 * but it would require division in fib gc, that it
2718 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2720 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2722 if (addrconf_finite_timeout(rt_expires))
2725 rt = addrconf_get_prefix_route(&pinfo->prefix,
2728 RTF_ADDRCONF | RTF_PREFIX_RT,
2732 /* Autoconf prefix route */
2733 if (valid_lft == 0) {
2734 ip6_del_rt(net, rt);
2736 } else if (addrconf_finite_timeout(rt_expires)) {
2738 fib6_set_expires(rt, jiffies + rt_expires);
2740 fib6_clean_expires(rt);
2742 } else if (valid_lft) {
2743 clock_t expires = 0;
2744 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2745 if (addrconf_finite_timeout(rt_expires)) {
2747 flags |= RTF_EXPIRES;
2748 expires = jiffies_to_clock_t(rt_expires);
2750 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2751 0, dev, expires, flags,
2754 fib6_info_release(rt);
2757 /* Try to figure out our local address for this prefix */
2759 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2760 struct in6_addr addr;
2761 bool tokenized = false, dev_addr_generated = false;
2763 if (pinfo->prefix_len == 64) {
2764 memcpy(&addr, &pinfo->prefix, 8);
2766 if (!ipv6_addr_any(&in6_dev->token)) {
2767 read_lock_bh(&in6_dev->lock);
2768 memcpy(addr.s6_addr + 8,
2769 in6_dev->token.s6_addr + 8, 8);
2770 read_unlock_bh(&in6_dev->lock);
2772 } else if (is_addr_mode_generate_stable(in6_dev) &&
2773 !ipv6_generate_stable_address(&addr, 0,
2775 addr_flags |= IFA_F_STABLE_PRIVACY;
2777 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2778 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2781 dev_addr_generated = true;
2785 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2790 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2793 tokenized, valid_lft,
2798 /* Ignore error case here because previous prefix add addr was
2799 * successful which will be notified.
2801 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2802 addr_type, addr_flags, sllao,
2803 tokenized, valid_lft,
2805 dev_addr_generated);
2807 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2809 in6_dev_put(in6_dev);
2813 * Set destination address.
2814 * Special case for SIT interfaces where we create a new "virtual"
2817 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2819 struct in6_ifreq ireq;
2820 struct net_device *dev;
2826 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2829 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2835 #if IS_ENABLED(CONFIG_IPV6_SIT)
2836 if (dev->type == ARPHRD_SIT) {
2837 const struct net_device_ops *ops = dev->netdev_ops;
2839 struct ip_tunnel_parm p;
2841 err = -EADDRNOTAVAIL;
2842 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2845 memset(&p, 0, sizeof(p));
2846 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2850 p.iph.protocol = IPPROTO_IPV6;
2852 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2854 if (ops->ndo_do_ioctl) {
2855 mm_segment_t oldfs = get_fs();
2858 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2865 dev = __dev_get_by_name(net, p.name);
2868 err = dev_open(dev, NULL);
2878 static int ipv6_mc_config(struct sock *sk, bool join,
2879 const struct in6_addr *addr, int ifindex)
2887 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2889 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2896 * Manual configuration of address on an interface
2898 static int inet6_addr_add(struct net *net, int ifindex,
2899 struct ifa6_config *cfg,
2900 struct netlink_ext_ack *extack)
2902 struct inet6_ifaddr *ifp;
2903 struct inet6_dev *idev;
2904 struct net_device *dev;
2905 unsigned long timeout;
2911 if (cfg->plen > 128)
2914 /* check the lifetime */
2915 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
2918 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64)
2921 dev = __dev_get_by_index(net, ifindex);
2925 idev = addrconf_add_dev(dev);
2927 return PTR_ERR(idev);
2929 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
2930 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2931 true, cfg->pfx, ifindex);
2937 cfg->scope = ipv6_addr_scope(cfg->pfx);
2939 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
2940 if (addrconf_finite_timeout(timeout)) {
2941 expires = jiffies_to_clock_t(timeout * HZ);
2942 cfg->valid_lft = timeout;
2943 flags = RTF_EXPIRES;
2947 cfg->ifa_flags |= IFA_F_PERMANENT;
2950 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
2951 if (addrconf_finite_timeout(timeout)) {
2953 cfg->ifa_flags |= IFA_F_DEPRECATED;
2954 cfg->preferred_lft = timeout;
2957 ifp = ipv6_add_addr(idev, cfg, true, extack);
2959 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
2960 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
2961 ifp->rt_priority, dev, expires,
2965 /* Send a netlink notification if DAD is enabled and
2966 * optimistic flag is not set
2968 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD)))
2969 ipv6_ifa_notify(0, ifp);
2971 * Note that section 3.1 of RFC 4429 indicates
2972 * that the Optimistic flag should not be set for
2973 * manually configured addresses
2975 addrconf_dad_start(ifp);
2976 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR)
2977 manage_tempaddrs(idev, ifp, cfg->valid_lft,
2978 cfg->preferred_lft, true, jiffies);
2980 addrconf_verify_rtnl();
2982 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
2983 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false,
2987 return PTR_ERR(ifp);
2990 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2991 const struct in6_addr *pfx, unsigned int plen)
2993 struct inet6_ifaddr *ifp;
2994 struct inet6_dev *idev;
2995 struct net_device *dev;
3000 dev = __dev_get_by_index(net, ifindex);
3004 idev = __in6_dev_get(dev);
3008 read_lock_bh(&idev->lock);
3009 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3010 if (ifp->prefix_len == plen &&
3011 ipv6_addr_equal(pfx, &ifp->addr)) {
3013 read_unlock_bh(&idev->lock);
3015 if (!(ifp->flags & IFA_F_TEMPORARY) &&
3016 (ifa_flags & IFA_F_MANAGETEMPADDR))
3017 manage_tempaddrs(idev, ifp, 0, 0, false,
3020 addrconf_verify_rtnl();
3021 if (ipv6_addr_is_multicast(pfx)) {
3022 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
3023 false, pfx, dev->ifindex);
3028 read_unlock_bh(&idev->lock);
3029 return -EADDRNOTAVAIL;
3033 int addrconf_add_ifaddr(struct net *net, void __user *arg)
3035 struct ifa6_config cfg = {
3036 .ifa_flags = IFA_F_PERMANENT,
3037 .preferred_lft = INFINITY_LIFE_TIME,
3038 .valid_lft = INFINITY_LIFE_TIME,
3040 struct in6_ifreq ireq;
3043 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3046 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3049 cfg.pfx = &ireq.ifr6_addr;
3050 cfg.plen = ireq.ifr6_prefixlen;
3053 err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL);
3058 int addrconf_del_ifaddr(struct net *net, void __user *arg)
3060 struct in6_ifreq ireq;
3063 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3066 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3070 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
3071 ireq.ifr6_prefixlen);
3076 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
3077 int plen, int scope)
3079 struct inet6_ifaddr *ifp;
3080 struct ifa6_config cfg = {
3083 .ifa_flags = IFA_F_PERMANENT,
3084 .valid_lft = INFINITY_LIFE_TIME,
3085 .preferred_lft = INFINITY_LIFE_TIME,
3089 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
3091 spin_lock_bh(&ifp->lock);
3092 ifp->flags &= ~IFA_F_TENTATIVE;
3093 spin_unlock_bh(&ifp->lock);
3094 rt_genid_bump_ipv6(dev_net(idev->dev));
3095 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3100 #if IS_ENABLED(CONFIG_IPV6_SIT)
3101 static void sit_add_v4_addrs(struct inet6_dev *idev)
3103 struct in6_addr addr;
3104 struct net_device *dev;
3105 struct net *net = dev_net(idev->dev);
3111 memset(&addr, 0, sizeof(struct in6_addr));
3112 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
3114 if (idev->dev->flags&IFF_POINTOPOINT) {
3115 addr.s6_addr32[0] = htonl(0xfe800000);
3119 scope = IPV6_ADDR_COMPATv4;
3121 pflags |= RTF_NONEXTHOP;
3124 if (addr.s6_addr32[3]) {
3125 add_addr(idev, &addr, plen, scope);
3126 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags,
3131 for_each_netdev(net, dev) {
3132 struct in_device *in_dev = __in_dev_get_rtnl(dev);
3133 if (in_dev && (dev->flags & IFF_UP)) {
3134 struct in_ifaddr *ifa;
3137 in_dev_for_each_ifa_rtnl(ifa, in_dev) {
3138 addr.s6_addr32[3] = ifa->ifa_local;
3140 if (ifa->ifa_scope == RT_SCOPE_LINK)
3142 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
3143 if (idev->dev->flags&IFF_POINTOPOINT)
3148 add_addr(idev, &addr, plen, flag);
3149 addrconf_prefix_route(&addr, plen, 0, idev->dev,
3150 0, pflags, GFP_KERNEL);
3157 static void init_loopback(struct net_device *dev)
3159 struct inet6_dev *idev;
3165 idev = ipv6_find_idev(dev);
3167 pr_debug("%s: add_dev failed\n", __func__);
3171 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
3174 void addrconf_add_linklocal(struct inet6_dev *idev,
3175 const struct in6_addr *addr, u32 flags)
3177 struct ifa6_config cfg = {
3180 .ifa_flags = flags | IFA_F_PERMANENT,
3181 .valid_lft = INFINITY_LIFE_TIME,
3182 .preferred_lft = INFINITY_LIFE_TIME,
3185 struct inet6_ifaddr *ifp;
3187 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3188 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad ||
3189 idev->cnf.optimistic_dad) &&
3190 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
3191 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
3194 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
3196 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev,
3198 addrconf_dad_start(ifp);
3202 EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
3204 static bool ipv6_reserved_interfaceid(struct in6_addr address)
3206 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3209 if (address.s6_addr32[2] == htonl(0x02005eff) &&
3210 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3213 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3214 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3220 static int ipv6_generate_stable_address(struct in6_addr *address,
3222 const struct inet6_dev *idev)
3224 static DEFINE_SPINLOCK(lock);
3225 static __u32 digest[SHA_DIGEST_WORDS];
3226 static __u32 workspace[SHA_WORKSPACE_WORDS];
3229 char __data[SHA_MESSAGE_BYTES];
3231 struct in6_addr secret;
3233 unsigned char hwaddr[MAX_ADDR_LEN];
3238 struct in6_addr secret;
3239 struct in6_addr temp;
3240 struct net *net = dev_net(idev->dev);
3242 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3244 if (idev->cnf.stable_secret.initialized)
3245 secret = idev->cnf.stable_secret.secret;
3246 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3247 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3252 spin_lock_bh(&lock);
3255 memset(&data, 0, sizeof(data));
3256 memset(workspace, 0, sizeof(workspace));
3257 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3258 data.prefix[0] = address->s6_addr32[0];
3259 data.prefix[1] = address->s6_addr32[1];
3260 data.secret = secret;
3261 data.dad_count = dad_count;
3263 sha_transform(digest, data.__data, workspace);
3266 temp.s6_addr32[2] = (__force __be32)digest[0];
3267 temp.s6_addr32[3] = (__force __be32)digest[1];
3269 spin_unlock_bh(&lock);
3271 if (ipv6_reserved_interfaceid(temp)) {
3273 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3282 static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3284 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3288 s = &idev->cnf.stable_secret;
3289 get_random_bytes(&s->secret, sizeof(s->secret));
3290 s->initialized = true;
3293 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3295 struct in6_addr addr;
3297 /* no link local addresses on L3 master devices */
3298 if (netif_is_l3_master(idev->dev))
3301 /* no link local addresses on devices flagged as slaves */
3302 if (idev->dev->flags & IFF_SLAVE)
3305 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3307 switch (idev->cnf.addr_gen_mode) {
3308 case IN6_ADDR_GEN_MODE_RANDOM:
3309 ipv6_gen_mode_random_init(idev);
3311 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
3312 if (!ipv6_generate_stable_address(&addr, 0, idev))
3313 addrconf_add_linklocal(idev, &addr,
3314 IFA_F_STABLE_PRIVACY);
3315 else if (prefix_route)
3316 addrconf_prefix_route(&addr, 64, 0, idev->dev,
3319 case IN6_ADDR_GEN_MODE_EUI64:
3320 /* addrconf_add_linklocal also adds a prefix_route and we
3321 * only need to care about prefix routes if ipv6_generate_eui64
3322 * couldn't generate one.
3324 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3325 addrconf_add_linklocal(idev, &addr, 0);
3326 else if (prefix_route)
3327 addrconf_prefix_route(&addr, 64, 0, idev->dev,
3330 case IN6_ADDR_GEN_MODE_NONE:
3332 /* will not add any link local address */
3337 static void addrconf_dev_config(struct net_device *dev)
3339 struct inet6_dev *idev;
3343 if ((dev->type != ARPHRD_ETHER) &&
3344 (dev->type != ARPHRD_FDDI) &&
3345 (dev->type != ARPHRD_ARCNET) &&
3346 (dev->type != ARPHRD_INFINIBAND) &&
3347 (dev->type != ARPHRD_IEEE1394) &&
3348 (dev->type != ARPHRD_TUNNEL6) &&
3349 (dev->type != ARPHRD_6LOWPAN) &&
3350 (dev->type != ARPHRD_IP6GRE) &&
3351 (dev->type != ARPHRD_IPGRE) &&
3352 (dev->type != ARPHRD_TUNNEL) &&
3353 (dev->type != ARPHRD_NONE) &&
3354 (dev->type != ARPHRD_RAWIP)) {
3355 /* Alas, we support only Ethernet autoconfiguration. */
3356 idev = __in6_dev_get(dev);
3357 if (!IS_ERR_OR_NULL(idev) && dev->flags & IFF_UP &&
3358 dev->flags & IFF_MULTICAST)
3363 idev = addrconf_add_dev(dev);
3367 /* this device type has no EUI support */
3368 if (dev->type == ARPHRD_NONE &&
3369 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3370 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
3372 addrconf_addr_gen(idev, false);
3375 #if IS_ENABLED(CONFIG_IPV6_SIT)
3376 static void addrconf_sit_config(struct net_device *dev)
3378 struct inet6_dev *idev;
3383 * Configure the tunnel with one of our IPv4
3384 * addresses... we should configure all of
3385 * our v4 addrs in the tunnel
3388 idev = ipv6_find_idev(dev);
3390 pr_debug("%s: add_dev failed\n", __func__);
3394 if (dev->priv_flags & IFF_ISATAP) {
3395 addrconf_addr_gen(idev, false);
3399 sit_add_v4_addrs(idev);
3401 if (dev->flags&IFF_POINTOPOINT)
3402 addrconf_add_mroute(dev);
3406 #if IS_ENABLED(CONFIG_NET_IPGRE)
3407 static void addrconf_gre_config(struct net_device *dev)
3409 struct inet6_dev *idev;
3413 idev = ipv6_find_idev(dev);
3415 pr_debug("%s: add_dev failed\n", __func__);
3419 addrconf_addr_gen(idev, true);
3420 if (dev->flags & IFF_POINTOPOINT)
3421 addrconf_add_mroute(dev);
3425 static int fixup_permanent_addr(struct net *net,
3426 struct inet6_dev *idev,
3427 struct inet6_ifaddr *ifp)
3429 /* !fib6_node means the host route was removed from the
3430 * FIB, for example, if 'lo' device is taken down. In that
3431 * case regenerate the host route.
3433 if (!ifp->rt || !ifp->rt->fib6_node) {
3434 struct fib6_info *f6i, *prev;
3436 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false,
3439 return PTR_ERR(f6i);
3441 /* ifp->rt can be accessed outside of rtnl */
3442 spin_lock(&ifp->lock);
3445 spin_unlock(&ifp->lock);
3447 fib6_info_release(prev);
3450 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3451 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3452 ifp->rt_priority, idev->dev, 0, 0,
3456 if (ifp->state == INET6_IFADDR_STATE_PREDAD)
3457 addrconf_dad_start(ifp);
3462 static void addrconf_permanent_addr(struct net *net, struct net_device *dev)
3464 struct inet6_ifaddr *ifp, *tmp;
3465 struct inet6_dev *idev;
3467 idev = __in6_dev_get(dev);
3471 write_lock_bh(&idev->lock);
3473 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3474 if ((ifp->flags & IFA_F_PERMANENT) &&
3475 fixup_permanent_addr(net, idev, ifp) < 0) {
3476 write_unlock_bh(&idev->lock);
3479 write_lock_bh(&idev->lock);
3481 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3482 idev->dev->name, &ifp->addr);
3486 write_unlock_bh(&idev->lock);
3489 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3492 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3493 struct netdev_notifier_change_info *change_info;
3494 struct netdev_notifier_changeupper_info *info;
3495 struct inet6_dev *idev = __in6_dev_get(dev);
3496 struct net *net = dev_net(dev);
3497 int run_pending = 0;
3501 case NETDEV_REGISTER:
3502 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3503 idev = ipv6_add_dev(dev);
3505 return notifier_from_errno(PTR_ERR(idev));
3509 case NETDEV_CHANGEMTU:
3510 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3511 if (dev->mtu < IPV6_MIN_MTU) {
3512 addrconf_ifdown(dev, dev != net->loopback_dev);
3517 rt6_mtu_change(dev, dev->mtu);
3518 idev->cnf.mtu6 = dev->mtu;
3522 /* allocate new idev */
3523 idev = ipv6_add_dev(dev);
3527 /* device is still not ready */
3528 if (!(idev->if_flags & IF_READY))
3535 if (dev->flags & IFF_SLAVE)
3538 if (idev && idev->cnf.disable_ipv6)
3541 if (event == NETDEV_UP) {
3542 /* restore routes for permanent addresses */
3543 addrconf_permanent_addr(net, dev);
3545 if (!addrconf_link_ready(dev)) {
3546 /* device is not ready yet. */
3547 pr_debug("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3552 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3553 idev = ipv6_add_dev(dev);
3555 if (!IS_ERR_OR_NULL(idev)) {
3556 idev->if_flags |= IF_READY;
3559 } else if (event == NETDEV_CHANGE) {
3560 if (!addrconf_link_ready(dev)) {
3561 /* device is still not ready. */
3562 rt6_sync_down_dev(dev, event);
3566 if (!IS_ERR_OR_NULL(idev)) {
3567 if (idev->if_flags & IF_READY) {
3568 /* device is already configured -
3569 * but resend MLD reports, we might
3570 * have roamed and need to update
3571 * multicast snooping switches
3575 if (change_info->flags_changed & IFF_NOARP)
3576 addrconf_dad_run(idev, true);
3577 rt6_sync_up(dev, RTNH_F_LINKDOWN);
3580 idev->if_flags |= IF_READY;
3583 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3589 switch (dev->type) {
3590 #if IS_ENABLED(CONFIG_IPV6_SIT)
3592 addrconf_sit_config(dev);
3595 #if IS_ENABLED(CONFIG_NET_IPGRE)
3597 addrconf_gre_config(dev);
3600 case ARPHRD_LOOPBACK:
3605 addrconf_dev_config(dev);
3609 if (!IS_ERR_OR_NULL(idev)) {
3611 addrconf_dad_run(idev, false);
3613 /* Device has an address by now */
3614 rt6_sync_up(dev, RTNH_F_DEAD);
3617 * If the MTU changed during the interface down,
3618 * when the interface up, the changed MTU must be
3619 * reflected in the idev as well as routers.
3621 if (idev->cnf.mtu6 != dev->mtu &&
3622 dev->mtu >= IPV6_MIN_MTU) {
3623 rt6_mtu_change(dev, dev->mtu);
3624 idev->cnf.mtu6 = dev->mtu;
3626 idev->tstamp = jiffies;
3627 inet6_ifinfo_notify(RTM_NEWLINK, idev);
3630 * If the changed mtu during down is lower than
3631 * IPV6_MIN_MTU stop IPv6 on this interface.
3633 if (dev->mtu < IPV6_MIN_MTU)
3634 addrconf_ifdown(dev, dev != net->loopback_dev);
3639 case NETDEV_UNREGISTER:
3641 * Remove all addresses from this interface.
3643 addrconf_ifdown(dev, event != NETDEV_DOWN);
3646 case NETDEV_CHANGENAME:
3648 snmp6_unregister_dev(idev);
3649 addrconf_sysctl_unregister(idev);
3650 err = addrconf_sysctl_register(idev);
3652 return notifier_from_errno(err);
3653 err = snmp6_register_dev(idev);
3655 addrconf_sysctl_unregister(idev);
3656 return notifier_from_errno(err);
3661 case NETDEV_PRE_TYPE_CHANGE:
3662 case NETDEV_POST_TYPE_CHANGE:
3664 addrconf_type_change(dev, event);
3667 case NETDEV_CHANGEUPPER:
3670 /* flush all routes if dev is linked to or unlinked from
3671 * an L3 master device (e.g., VRF)
3673 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3674 addrconf_ifdown(dev, 0);
3681 * addrconf module should be notified of a device going up
3683 static struct notifier_block ipv6_dev_notf = {
3684 .notifier_call = addrconf_notify,
3685 .priority = ADDRCONF_NOTIFY_PRIORITY,
3688 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3690 struct inet6_dev *idev;
3693 idev = __in6_dev_get(dev);
3695 if (event == NETDEV_POST_TYPE_CHANGE)
3696 ipv6_mc_remap(idev);
3697 else if (event == NETDEV_PRE_TYPE_CHANGE)
3698 ipv6_mc_unmap(idev);
3701 static bool addr_is_local(const struct in6_addr *addr)
3703 return ipv6_addr_type(addr) &
3704 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3707 static int addrconf_ifdown(struct net_device *dev, int how)
3709 unsigned long event = how ? NETDEV_UNREGISTER : NETDEV_DOWN;
3710 struct net *net = dev_net(dev);
3711 struct inet6_dev *idev;
3712 struct inet6_ifaddr *ifa, *tmp;
3713 bool keep_addr = false;
3718 rt6_disable_ip(dev, event);
3720 idev = __in6_dev_get(dev);
3725 * Step 1: remove reference to ipv6 device from parent device.
3731 /* protected by rtnl_lock */
3732 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3734 /* Step 1.5: remove snmp6 entry */
3735 snmp6_unregister_dev(idev);
3739 /* combine the user config with event to determine if permanent
3740 * addresses are to be removed from address hash table
3742 if (!how && !idev->cnf.disable_ipv6) {
3743 /* aggregate the system setting and interface setting */
3744 int _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3747 _keep_addr = idev->cnf.keep_addr_on_down;
3749 keep_addr = (_keep_addr > 0);
3752 /* Step 2: clear hash table */
3753 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3754 struct hlist_head *h = &inet6_addr_lst[i];
3756 spin_lock_bh(&addrconf_hash_lock);
3758 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3759 if (ifa->idev == idev) {
3760 addrconf_del_dad_work(ifa);
3761 /* combined flag + permanent flag decide if
3762 * address is retained on a down event
3765 !(ifa->flags & IFA_F_PERMANENT) ||
3766 addr_is_local(&ifa->addr)) {
3767 hlist_del_init_rcu(&ifa->addr_lst);
3772 spin_unlock_bh(&addrconf_hash_lock);
3775 write_lock_bh(&idev->lock);
3777 addrconf_del_rs_timer(idev);
3779 /* Step 2: clear flags for stateless addrconf */
3781 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3783 /* Step 3: clear tempaddr list */
3784 while (!list_empty(&idev->tempaddr_list)) {
3785 ifa = list_first_entry(&idev->tempaddr_list,
3786 struct inet6_ifaddr, tmp_list);
3787 list_del(&ifa->tmp_list);
3788 write_unlock_bh(&idev->lock);
3789 spin_lock_bh(&ifa->lock);
3792 in6_ifa_put(ifa->ifpub);
3795 spin_unlock_bh(&ifa->lock);
3797 write_lock_bh(&idev->lock);
3800 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
3801 struct fib6_info *rt = NULL;
3804 addrconf_del_dad_work(ifa);
3806 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3807 !addr_is_local(&ifa->addr);
3809 write_unlock_bh(&idev->lock);
3810 spin_lock_bh(&ifa->lock);
3813 /* set state to skip the notifier below */
3814 state = INET6_IFADDR_STATE_DEAD;
3815 ifa->state = INET6_IFADDR_STATE_PREDAD;
3816 if (!(ifa->flags & IFA_F_NODAD))
3817 ifa->flags |= IFA_F_TENTATIVE;
3823 ifa->state = INET6_IFADDR_STATE_DEAD;
3826 spin_unlock_bh(&ifa->lock);
3829 ip6_del_rt(net, rt);
3831 if (state != INET6_IFADDR_STATE_DEAD) {
3832 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3833 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3835 if (idev->cnf.forwarding)
3836 addrconf_leave_anycast(ifa);
3837 addrconf_leave_solict(ifa->idev, &ifa->addr);
3840 write_lock_bh(&idev->lock);
3842 list_del_rcu(&ifa->if_list);
3847 write_unlock_bh(&idev->lock);
3849 /* Step 5: Discard anycast and multicast list */
3851 ipv6_ac_destroy_dev(idev);
3852 ipv6_mc_destroy_dev(idev);
3857 idev->tstamp = jiffies;
3859 /* Last: Shot the device (if unregistered) */
3861 addrconf_sysctl_unregister(idev);
3862 neigh_parms_release(&nd_tbl, idev->nd_parms);
3863 neigh_ifdown(&nd_tbl, dev);
3869 static void addrconf_rs_timer(struct timer_list *t)
3871 struct inet6_dev *idev = from_timer(idev, t, rs_timer);
3872 struct net_device *dev = idev->dev;
3873 struct in6_addr lladdr;
3875 write_lock(&idev->lock);
3876 if (idev->dead || !(idev->if_flags & IF_READY))
3879 if (!ipv6_accept_ra(idev))
3882 /* Announcement received after solicitation was sent */
3883 if (idev->if_flags & IF_RA_RCVD)
3886 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
3887 write_unlock(&idev->lock);
3888 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3889 ndisc_send_rs(dev, &lladdr,
3890 &in6addr_linklocal_allrouters);
3894 write_lock(&idev->lock);
3895 idev->rs_interval = rfc3315_s14_backoff_update(
3896 idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
3897 /* The wait after the last probe can be shorter */
3898 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3899 idev->cnf.rtr_solicits) ?
3900 idev->cnf.rtr_solicit_delay :
3904 * Note: we do not support deprecated "all on-link"
3905 * assumption any longer.
3907 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3911 write_unlock(&idev->lock);
3917 * Duplicate Address Detection
3919 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3921 unsigned long rand_num;
3922 struct inet6_dev *idev = ifp->idev;
3925 if (ifp->flags & IFA_F_OPTIMISTIC)
3928 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3931 if (idev->cnf.enhanced_dad ||
3932 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) {
3934 get_random_bytes(&nonce, 6);
3937 ifp->dad_nonce = nonce;
3938 ifp->dad_probes = idev->cnf.dad_transmits;
3939 addrconf_mod_dad_work(ifp, rand_num);
3942 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3944 struct inet6_dev *idev = ifp->idev;
3945 struct net_device *dev = idev->dev;
3946 bool bump_id, notify = false;
3949 addrconf_join_solict(dev, &ifp->addr);
3951 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3953 read_lock_bh(&idev->lock);
3954 spin_lock(&ifp->lock);
3955 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3959 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3960 (net->ipv6.devconf_all->accept_dad < 1 &&
3961 idev->cnf.accept_dad < 1) ||
3962 !(ifp->flags&IFA_F_TENTATIVE) ||
3963 ifp->flags & IFA_F_NODAD) {
3964 bool send_na = false;
3966 if (ifp->flags & IFA_F_TENTATIVE &&
3967 !(ifp->flags & IFA_F_OPTIMISTIC))
3969 bump_id = ifp->flags & IFA_F_TENTATIVE;
3970 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3971 spin_unlock(&ifp->lock);
3972 read_unlock_bh(&idev->lock);
3974 addrconf_dad_completed(ifp, bump_id, send_na);
3978 if (!(idev->if_flags & IF_READY)) {
3979 spin_unlock(&ifp->lock);
3980 read_unlock_bh(&idev->lock);
3982 * If the device is not ready:
3983 * - keep it tentative if it is a permanent address.
3984 * - otherwise, kill it.
3987 addrconf_dad_stop(ifp, 0);
3992 * Optimistic nodes can start receiving
3995 if (ifp->flags & IFA_F_OPTIMISTIC) {
3996 ip6_ins_rt(net, ifp->rt);
3997 if (ipv6_use_optimistic_addr(net, idev)) {
3998 /* Because optimistic nodes can use this address,
3999 * notify listeners. If DAD fails, RTM_DELADDR is sent.
4005 addrconf_dad_kick(ifp);
4007 spin_unlock(&ifp->lock);
4008 read_unlock_bh(&idev->lock);
4010 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4013 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
4015 bool begin_dad = false;
4017 spin_lock_bh(&ifp->lock);
4018 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
4019 ifp->state = INET6_IFADDR_STATE_PREDAD;
4022 spin_unlock_bh(&ifp->lock);
4025 addrconf_mod_dad_work(ifp, 0);
4028 static void addrconf_dad_work(struct work_struct *w)
4030 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
4031 struct inet6_ifaddr,
4033 struct inet6_dev *idev = ifp->idev;
4034 bool bump_id, disable_ipv6 = false;
4035 struct in6_addr mcaddr;
4041 } action = DAD_PROCESS;
4045 spin_lock_bh(&ifp->lock);
4046 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
4048 ifp->state = INET6_IFADDR_STATE_DAD;
4049 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
4051 ifp->state = INET6_IFADDR_STATE_POSTDAD;
4053 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 ||
4054 idev->cnf.accept_dad > 1) &&
4055 !idev->cnf.disable_ipv6 &&
4056 !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
4057 struct in6_addr addr;
4059 addr.s6_addr32[0] = htonl(0xfe800000);
4060 addr.s6_addr32[1] = 0;
4062 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
4063 ipv6_addr_equal(&ifp->addr, &addr)) {
4064 /* DAD failed for link-local based on MAC */
4065 idev->cnf.disable_ipv6 = 1;
4067 pr_info("%s: IPv6 being disabled!\n",
4068 ifp->idev->dev->name);
4069 disable_ipv6 = true;
4073 spin_unlock_bh(&ifp->lock);
4075 if (action == DAD_BEGIN) {
4076 addrconf_dad_begin(ifp);
4078 } else if (action == DAD_ABORT) {
4080 addrconf_dad_stop(ifp, 1);
4082 addrconf_ifdown(idev->dev, 0);
4086 if (!ifp->dad_probes && addrconf_dad_end(ifp))
4089 write_lock_bh(&idev->lock);
4090 if (idev->dead || !(idev->if_flags & IF_READY)) {
4091 write_unlock_bh(&idev->lock);
4095 spin_lock(&ifp->lock);
4096 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
4097 spin_unlock(&ifp->lock);
4098 write_unlock_bh(&idev->lock);
4102 if (ifp->dad_probes == 0) {
4103 bool send_na = false;
4106 * DAD was successful
4109 if (ifp->flags & IFA_F_TENTATIVE &&
4110 !(ifp->flags & IFA_F_OPTIMISTIC))
4112 bump_id = ifp->flags & IFA_F_TENTATIVE;
4113 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
4114 spin_unlock(&ifp->lock);
4115 write_unlock_bh(&idev->lock);
4117 addrconf_dad_completed(ifp, bump_id, send_na);
4123 addrconf_mod_dad_work(ifp,
4124 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME),
4126 spin_unlock(&ifp->lock);
4127 write_unlock_bh(&idev->lock);
4129 /* send a neighbour solicitation for our addr */
4130 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
4131 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
4138 /* ifp->idev must be at least read locked */
4139 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
4141 struct inet6_ifaddr *ifpiter;
4142 struct inet6_dev *idev = ifp->idev;
4144 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
4145 if (ifpiter->scope > IFA_LINK)
4147 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
4148 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
4149 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
4156 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
4159 struct net_device *dev = ifp->idev->dev;
4160 struct in6_addr lladdr;
4161 bool send_rs, send_mld;
4163 addrconf_del_dad_work(ifp);
4166 * Configure the address for reception. Now it is valid.
4169 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4171 /* If added prefix is link local and we are prepared to process
4172 router advertisements, start sending router solicitations.
4175 read_lock_bh(&ifp->idev->lock);
4176 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
4177 send_rs = send_mld &&
4178 ipv6_accept_ra(ifp->idev) &&
4179 ifp->idev->cnf.rtr_solicits != 0 &&
4180 (dev->flags&IFF_LOOPBACK) == 0;
4181 read_unlock_bh(&ifp->idev->lock);
4183 /* While dad is in progress mld report's source address is in6_addrany.
4184 * Resend with proper ll now.
4187 ipv6_mc_dad_complete(ifp->idev);
4189 /* send unsolicited NA if enabled */
4191 (ifp->idev->cnf.ndisc_notify ||
4192 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) {
4193 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr,
4194 /*router=*/ !!ifp->idev->cnf.forwarding,
4195 /*solicited=*/ false, /*override=*/ true,
4201 * If a host as already performed a random delay
4202 * [...] as part of DAD [...] there is no need
4203 * to delay again before sending the first RS
4205 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
4207 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
4209 write_lock_bh(&ifp->idev->lock);
4210 spin_lock(&ifp->lock);
4211 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4212 ifp->idev->cnf.rtr_solicit_interval);
4213 ifp->idev->rs_probes = 1;
4214 ifp->idev->if_flags |= IF_RS_SENT;
4215 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
4216 spin_unlock(&ifp->lock);
4217 write_unlock_bh(&ifp->idev->lock);
4221 rt_genid_bump_ipv6(dev_net(dev));
4223 /* Make sure that a new temporary address will be created
4224 * before this temporary address becomes deprecated.
4226 if (ifp->flags & IFA_F_TEMPORARY)
4227 addrconf_verify_rtnl();
4230 static void addrconf_dad_run(struct inet6_dev *idev, bool restart)
4232 struct inet6_ifaddr *ifp;
4234 read_lock_bh(&idev->lock);
4235 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4236 spin_lock(&ifp->lock);
4237 if ((ifp->flags & IFA_F_TENTATIVE &&
4238 ifp->state == INET6_IFADDR_STATE_DAD) || restart) {
4240 ifp->state = INET6_IFADDR_STATE_PREDAD;
4241 addrconf_dad_kick(ifp);
4243 spin_unlock(&ifp->lock);
4245 read_unlock_bh(&idev->lock);
4248 #ifdef CONFIG_PROC_FS
4249 struct if6_iter_state {
4250 struct seq_net_private p;
4255 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
4257 struct if6_iter_state *state = seq->private;
4258 struct net *net = seq_file_net(seq);
4259 struct inet6_ifaddr *ifa = NULL;
4262 /* initial bucket if pos is 0 */
4268 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
4269 hlist_for_each_entry_rcu(ifa, &inet6_addr_lst[state->bucket],
4271 if (!net_eq(dev_net(ifa->idev->dev), net))
4273 /* sync with offset */
4274 if (p < state->offset) {
4281 /* prepare for next bucket */
4288 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4289 struct inet6_ifaddr *ifa)
4291 struct if6_iter_state *state = seq->private;
4292 struct net *net = seq_file_net(seq);
4294 hlist_for_each_entry_continue_rcu(ifa, addr_lst) {
4295 if (!net_eq(dev_net(ifa->idev->dev), net))
4302 while (++state->bucket < IN6_ADDR_HSIZE) {
4303 hlist_for_each_entry_rcu(ifa,
4304 &inet6_addr_lst[state->bucket], addr_lst) {
4305 if (!net_eq(dev_net(ifa->idev->dev), net))
4314 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4318 return if6_get_first(seq, *pos);
4321 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4323 struct inet6_ifaddr *ifa;
4325 ifa = if6_get_next(seq, v);
4330 static void if6_seq_stop(struct seq_file *seq, void *v)
4336 static int if6_seq_show(struct seq_file *seq, void *v)
4338 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4339 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
4341 ifp->idev->dev->ifindex,
4345 ifp->idev->dev->name);
4349 static const struct seq_operations if6_seq_ops = {
4350 .start = if6_seq_start,
4351 .next = if6_seq_next,
4352 .show = if6_seq_show,
4353 .stop = if6_seq_stop,
4356 static int __net_init if6_proc_net_init(struct net *net)
4358 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops,
4359 sizeof(struct if6_iter_state)))
4364 static void __net_exit if6_proc_net_exit(struct net *net)
4366 remove_proc_entry("if_inet6", net->proc_net);
4369 static struct pernet_operations if6_proc_net_ops = {
4370 .init = if6_proc_net_init,
4371 .exit = if6_proc_net_exit,
4374 int __init if6_proc_init(void)
4376 return register_pernet_subsys(&if6_proc_net_ops);
4379 void if6_proc_exit(void)
4381 unregister_pernet_subsys(&if6_proc_net_ops);
4383 #endif /* CONFIG_PROC_FS */
4385 #if IS_ENABLED(CONFIG_IPV6_MIP6)
4386 /* Check if address is a home address configured on any interface. */
4387 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
4389 unsigned int hash = inet6_addr_hash(net, addr);
4390 struct inet6_ifaddr *ifp = NULL;
4394 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
4395 if (!net_eq(dev_net(ifp->idev->dev), net))
4397 if (ipv6_addr_equal(&ifp->addr, addr) &&
4398 (ifp->flags & IFA_F_HOMEADDRESS)) {
4408 /* RFC6554 has some algorithm to avoid loops in segment routing by
4409 * checking if the segments contains any of a local interface address.
4413 * To detect loops in the SRH, a router MUST determine if the SRH
4414 * includes multiple addresses assigned to any interface on that router.
4415 * If such addresses appear more than once and are separated by at least
4416 * one address not assigned to that router.
4418 int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs,
4419 unsigned char nsegs)
4421 const struct in6_addr *addr;
4422 int i, ret = 0, found = 0;
4423 struct inet6_ifaddr *ifp;
4424 bool separated = false;
4429 for (i = 0; i < nsegs; i++) {
4431 hash = inet6_addr_hash(net, addr);
4434 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
4435 if (!net_eq(dev_net(ifp->idev->dev), net))
4438 if (ipv6_addr_equal(&ifp->addr, addr)) {
4445 if (found > 1 && separated) {
4462 * Periodic address status verification
4465 static void addrconf_verify_rtnl(void)
4467 unsigned long now, next, next_sec, next_sched;
4468 struct inet6_ifaddr *ifp;
4475 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
4477 cancel_delayed_work(&addr_chk_work);
4479 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
4481 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
4484 /* When setting preferred_lft to a value not zero or
4485 * infinity, while valid_lft is infinity
4486 * IFA_F_PERMANENT has a non-infinity life time.
4488 if ((ifp->flags & IFA_F_PERMANENT) &&
4489 (ifp->prefered_lft == INFINITY_LIFE_TIME))
4492 spin_lock(&ifp->lock);
4493 /* We try to batch several events at once. */
4494 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
4496 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4497 age >= ifp->valid_lft) {
4498 spin_unlock(&ifp->lock);
4502 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4503 spin_unlock(&ifp->lock);
4505 } else if (age >= ifp->prefered_lft) {
4506 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
4509 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4511 ifp->flags |= IFA_F_DEPRECATED;
4514 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4515 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
4516 next = ifp->tstamp + ifp->valid_lft * HZ;
4518 spin_unlock(&ifp->lock);
4523 ipv6_ifa_notify(0, ifp);
4527 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4528 !(ifp->flags&IFA_F_TENTATIVE)) {
4529 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4530 ifp->idev->cnf.dad_transmits *
4531 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME), HZ/100) / HZ;
4533 if (age >= ifp->prefered_lft - regen_advance) {
4534 struct inet6_ifaddr *ifpub = ifp->ifpub;
4535 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4536 next = ifp->tstamp + ifp->prefered_lft * HZ;
4537 if (!ifp->regen_count && ifpub) {
4540 in6_ifa_hold(ifpub);
4541 spin_unlock(&ifp->lock);
4543 spin_lock(&ifpub->lock);
4544 ifpub->regen_count = 0;
4545 spin_unlock(&ifpub->lock);
4546 rcu_read_unlock_bh();
4547 ipv6_create_tempaddr(ifpub, ifp, true);
4553 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4554 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4555 spin_unlock(&ifp->lock);
4557 /* ifp->prefered_lft <= ifp->valid_lft */
4558 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4559 next = ifp->tstamp + ifp->prefered_lft * HZ;
4560 spin_unlock(&ifp->lock);
4565 next_sec = round_jiffies_up(next);
4568 /* If rounded timeout is accurate enough, accept it. */
4569 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4570 next_sched = next_sec;
4572 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4573 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4574 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4576 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4577 now, next, next_sec, next_sched);
4578 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
4579 rcu_read_unlock_bh();
4582 static void addrconf_verify_work(struct work_struct *w)
4585 addrconf_verify_rtnl();
4589 static void addrconf_verify(void)
4591 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4594 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4595 struct in6_addr **peer_pfx)
4597 struct in6_addr *pfx = NULL;
4602 pfx = nla_data(addr);
4605 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4607 pfx = nla_data(local);
4613 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4614 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4615 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4616 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
4617 [IFA_FLAGS] = { .len = sizeof(u32) },
4618 [IFA_RT_PRIORITY] = { .len = sizeof(u32) },
4619 [IFA_TARGET_NETNSID] = { .type = NLA_S32 },
4623 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
4624 struct netlink_ext_ack *extack)
4626 struct net *net = sock_net(skb->sk);
4627 struct ifaddrmsg *ifm;
4628 struct nlattr *tb[IFA_MAX+1];
4629 struct in6_addr *pfx, *peer_pfx;
4633 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4634 ifa_ipv6_policy, extack);
4638 ifm = nlmsg_data(nlh);
4639 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4643 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4645 /* We ignore other flags so far. */
4646 ifa_flags &= IFA_F_MANAGETEMPADDR;
4648 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4649 ifm->ifa_prefixlen);
4652 static int modify_prefix_route(struct inet6_ifaddr *ifp,
4653 unsigned long expires, u32 flags,
4656 struct fib6_info *f6i;
4659 f6i = addrconf_get_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
4661 ifp->idev->dev, 0, RTF_DEFAULT, true);
4665 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF;
4666 if (f6i->fib6_metric != prio) {
4667 /* delete old one */
4668 ip6_del_rt(dev_net(ifp->idev->dev), f6i);
4671 addrconf_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
4673 ifp->rt_priority, ifp->idev->dev,
4674 expires, flags, GFP_KERNEL);
4677 fib6_clean_expires(f6i);
4679 fib6_set_expires(f6i, expires);
4681 fib6_info_release(f6i);
4687 static int inet6_addr_modify(struct inet6_ifaddr *ifp, struct ifa6_config *cfg)
4691 unsigned long timeout;
4692 bool was_managetempaddr;
4693 bool had_prefixroute;
4694 bool new_peer = false;
4698 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
4701 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR &&
4702 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4705 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED)
4706 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC;
4708 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
4709 if (addrconf_finite_timeout(timeout)) {
4710 expires = jiffies_to_clock_t(timeout * HZ);
4711 cfg->valid_lft = timeout;
4712 flags = RTF_EXPIRES;
4716 cfg->ifa_flags |= IFA_F_PERMANENT;
4719 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
4720 if (addrconf_finite_timeout(timeout)) {
4722 cfg->ifa_flags |= IFA_F_DEPRECATED;
4723 cfg->preferred_lft = timeout;
4726 if (cfg->peer_pfx &&
4727 memcmp(&ifp->peer_addr, cfg->peer_pfx, sizeof(struct in6_addr))) {
4728 if (!ipv6_addr_any(&ifp->peer_addr))
4729 cleanup_prefix_route(ifp, expires, true, true);
4733 spin_lock_bh(&ifp->lock);
4734 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4735 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4736 !(ifp->flags & IFA_F_NOPREFIXROUTE);
4737 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4738 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4739 IFA_F_NOPREFIXROUTE);
4740 ifp->flags |= cfg->ifa_flags;
4741 ifp->tstamp = jiffies;
4742 ifp->valid_lft = cfg->valid_lft;
4743 ifp->prefered_lft = cfg->preferred_lft;
4745 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority)
4746 ifp->rt_priority = cfg->rt_priority;
4749 ifp->peer_addr = *cfg->peer_pfx;
4751 spin_unlock_bh(&ifp->lock);
4752 if (!(ifp->flags&IFA_F_TENTATIVE))
4753 ipv6_ifa_notify(0, ifp);
4755 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
4758 if (had_prefixroute)
4759 rc = modify_prefix_route(ifp, expires, flags, false);
4761 /* prefix route could have been deleted; if so restore it */
4762 if (rc == -ENOENT) {
4763 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
4764 ifp->rt_priority, ifp->idev->dev,
4765 expires, flags, GFP_KERNEL);
4768 if (had_prefixroute && !ipv6_addr_any(&ifp->peer_addr))
4769 rc = modify_prefix_route(ifp, expires, flags, true);
4771 if (rc == -ENOENT && !ipv6_addr_any(&ifp->peer_addr)) {
4772 addrconf_prefix_route(&ifp->peer_addr, ifp->prefix_len,
4773 ifp->rt_priority, ifp->idev->dev,
4774 expires, flags, GFP_KERNEL);
4776 } else if (had_prefixroute) {
4777 enum cleanup_prefix_rt_t action;
4778 unsigned long rt_expires;
4780 write_lock_bh(&ifp->idev->lock);
4781 action = check_cleanup_prefix_route(ifp, &rt_expires);
4782 write_unlock_bh(&ifp->idev->lock);
4784 if (action != CLEANUP_PREFIX_RT_NOP) {
4785 cleanup_prefix_route(ifp, rt_expires,
4786 action == CLEANUP_PREFIX_RT_DEL, false);
4790 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4791 if (was_managetempaddr &&
4792 !(ifp->flags & IFA_F_MANAGETEMPADDR)) {
4794 cfg->preferred_lft = 0;
4796 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft,
4797 cfg->preferred_lft, !was_managetempaddr,
4801 addrconf_verify_rtnl();
4807 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
4808 struct netlink_ext_ack *extack)
4810 struct net *net = sock_net(skb->sk);
4811 struct ifaddrmsg *ifm;
4812 struct nlattr *tb[IFA_MAX+1];
4813 struct in6_addr *peer_pfx;
4814 struct inet6_ifaddr *ifa;
4815 struct net_device *dev;
4816 struct inet6_dev *idev;
4817 struct ifa6_config cfg;
4820 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4821 ifa_ipv6_policy, extack);
4825 memset(&cfg, 0, sizeof(cfg));
4827 ifm = nlmsg_data(nlh);
4828 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4832 cfg.peer_pfx = peer_pfx;
4833 cfg.plen = ifm->ifa_prefixlen;
4834 if (tb[IFA_RT_PRIORITY])
4835 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]);
4837 cfg.valid_lft = INFINITY_LIFE_TIME;
4838 cfg.preferred_lft = INFINITY_LIFE_TIME;
4840 if (tb[IFA_CACHEINFO]) {
4841 struct ifa_cacheinfo *ci;
4843 ci = nla_data(tb[IFA_CACHEINFO]);
4844 cfg.valid_lft = ci->ifa_valid;
4845 cfg.preferred_lft = ci->ifa_prefered;
4848 dev = __dev_get_by_index(net, ifm->ifa_index);
4853 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]);
4855 cfg.ifa_flags = ifm->ifa_flags;
4857 /* We ignore other flags so far. */
4858 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS |
4859 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE |
4860 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC;
4862 idev = ipv6_find_idev(dev);
4864 return PTR_ERR(idev);
4866 if (!ipv6_allow_optimistic_dad(net, idev))
4867 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC;
4869 if (cfg.ifa_flags & IFA_F_NODAD &&
4870 cfg.ifa_flags & IFA_F_OPTIMISTIC) {
4871 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive");
4875 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1);
4878 * It would be best to check for !NLM_F_CREATE here but
4879 * userspace already relies on not having to provide this.
4881 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack);
4884 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4885 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4888 err = inet6_addr_modify(ifa, &cfg);
4895 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4896 u8 scope, int ifindex)
4898 struct ifaddrmsg *ifm;
4900 ifm = nlmsg_data(nlh);
4901 ifm->ifa_family = AF_INET6;
4902 ifm->ifa_prefixlen = prefixlen;
4903 ifm->ifa_flags = flags;
4904 ifm->ifa_scope = scope;
4905 ifm->ifa_index = ifindex;
4908 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4909 unsigned long tstamp, u32 preferred, u32 valid)
4911 struct ifa_cacheinfo ci;
4913 ci.cstamp = cstamp_delta(cstamp);
4914 ci.tstamp = cstamp_delta(tstamp);
4915 ci.ifa_prefered = preferred;
4916 ci.ifa_valid = valid;
4918 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4921 static inline int rt_scope(int ifa_scope)
4923 if (ifa_scope & IFA_HOST)
4924 return RT_SCOPE_HOST;
4925 else if (ifa_scope & IFA_LINK)
4926 return RT_SCOPE_LINK;
4927 else if (ifa_scope & IFA_SITE)
4928 return RT_SCOPE_SITE;
4930 return RT_SCOPE_UNIVERSE;
4933 static inline int inet6_ifaddr_msgsize(void)
4935 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4936 + nla_total_size(16) /* IFA_LOCAL */
4937 + nla_total_size(16) /* IFA_ADDRESS */
4938 + nla_total_size(sizeof(struct ifa_cacheinfo))
4939 + nla_total_size(4) /* IFA_FLAGS */
4940 + nla_total_size(4) /* IFA_RT_PRIORITY */;
4949 struct inet6_fill_args {
4956 enum addr_type_t type;
4959 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
4960 struct inet6_fill_args *args)
4962 struct nlmsghdr *nlh;
4963 u32 preferred, valid;
4965 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
4966 sizeof(struct ifaddrmsg), args->flags);
4970 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4971 ifa->idev->dev->ifindex);
4973 if (args->netnsid >= 0 &&
4974 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
4977 if (!((ifa->flags&IFA_F_PERMANENT) &&
4978 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
4979 preferred = ifa->prefered_lft;
4980 valid = ifa->valid_lft;
4981 if (preferred != INFINITY_LIFE_TIME) {
4982 long tval = (jiffies - ifa->tstamp)/HZ;
4983 if (preferred > tval)
4987 if (valid != INFINITY_LIFE_TIME) {
4995 preferred = INFINITY_LIFE_TIME;
4996 valid = INFINITY_LIFE_TIME;
4999 if (!ipv6_addr_any(&ifa->peer_addr)) {
5000 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
5001 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
5004 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
5007 if (ifa->rt_priority &&
5008 nla_put_u32(skb, IFA_RT_PRIORITY, ifa->rt_priority))
5011 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
5014 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
5017 nlmsg_end(skb, nlh);
5021 nlmsg_cancel(skb, nlh);
5025 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
5026 struct inet6_fill_args *args)
5028 struct nlmsghdr *nlh;
5029 u8 scope = RT_SCOPE_UNIVERSE;
5030 int ifindex = ifmca->idev->dev->ifindex;
5032 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
5033 scope = RT_SCOPE_SITE;
5035 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5036 sizeof(struct ifaddrmsg), args->flags);
5040 if (args->netnsid >= 0 &&
5041 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
5044 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
5045 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
5046 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
5047 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
5048 nlmsg_cancel(skb, nlh);
5052 nlmsg_end(skb, nlh);
5056 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
5057 struct inet6_fill_args *args)
5059 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt);
5060 int ifindex = dev ? dev->ifindex : 1;
5061 struct nlmsghdr *nlh;
5062 u8 scope = RT_SCOPE_UNIVERSE;
5064 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
5065 scope = RT_SCOPE_SITE;
5067 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5068 sizeof(struct ifaddrmsg), args->flags);
5072 if (args->netnsid >= 0 &&
5073 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
5076 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
5077 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
5078 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
5079 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
5080 nlmsg_cancel(skb, nlh);
5084 nlmsg_end(skb, nlh);
5088 /* called with rcu_read_lock() */
5089 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
5090 struct netlink_callback *cb, int s_ip_idx,
5091 struct inet6_fill_args *fillargs)
5093 struct ifmcaddr6 *ifmca;
5094 struct ifacaddr6 *ifaca;
5098 read_lock_bh(&idev->lock);
5099 switch (fillargs->type) {
5100 case UNICAST_ADDR: {
5101 struct inet6_ifaddr *ifa;
5102 fillargs->event = RTM_NEWADDR;
5104 /* unicast address incl. temp addr */
5105 list_for_each_entry(ifa, &idev->addr_list, if_list) {
5106 if (ip_idx < s_ip_idx)
5108 err = inet6_fill_ifaddr(skb, ifa, fillargs);
5111 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
5117 case MULTICAST_ADDR:
5118 fillargs->event = RTM_GETMULTICAST;
5120 /* multicast address */
5121 for (ifmca = idev->mc_list; ifmca;
5122 ifmca = ifmca->next, ip_idx++) {
5123 if (ip_idx < s_ip_idx)
5125 err = inet6_fill_ifmcaddr(skb, ifmca, fillargs);
5131 fillargs->event = RTM_GETANYCAST;
5132 /* anycast address */
5133 for (ifaca = idev->ac_list; ifaca;
5134 ifaca = ifaca->aca_next, ip_idx++) {
5135 if (ip_idx < s_ip_idx)
5137 err = inet6_fill_ifacaddr(skb, ifaca, fillargs);
5145 read_unlock_bh(&idev->lock);
5146 cb->args[2] = ip_idx;
5150 static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh,
5151 struct inet6_fill_args *fillargs,
5152 struct net **tgt_net, struct sock *sk,
5153 struct netlink_callback *cb)
5155 struct netlink_ext_ack *extack = cb->extack;
5156 struct nlattr *tb[IFA_MAX+1];
5157 struct ifaddrmsg *ifm;
5160 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5161 NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request");
5165 ifm = nlmsg_data(nlh);
5166 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5167 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request");
5171 fillargs->ifindex = ifm->ifa_index;
5172 if (fillargs->ifindex) {
5173 cb->answer_flags |= NLM_F_DUMP_FILTERED;
5174 fillargs->flags |= NLM_F_DUMP_FILTERED;
5177 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5178 ifa_ipv6_policy, extack);
5182 for (i = 0; i <= IFA_MAX; ++i) {
5186 if (i == IFA_TARGET_NETNSID) {
5189 fillargs->netnsid = nla_get_s32(tb[i]);
5190 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid);
5192 fillargs->netnsid = -1;
5193 NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id");
5194 return PTR_ERR(net);
5198 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request");
5206 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
5207 enum addr_type_t type)
5209 const struct nlmsghdr *nlh = cb->nlh;
5210 struct inet6_fill_args fillargs = {
5211 .portid = NETLINK_CB(cb->skb).portid,
5212 .seq = cb->nlh->nlmsg_seq,
5213 .flags = NLM_F_MULTI,
5217 struct net *net = sock_net(skb->sk);
5218 struct net *tgt_net = net;
5219 int idx, s_idx, s_ip_idx;
5221 struct net_device *dev;
5222 struct inet6_dev *idev;
5223 struct hlist_head *head;
5227 s_idx = idx = cb->args[1];
5228 s_ip_idx = cb->args[2];
5230 if (cb->strict_check) {
5231 err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net,
5237 if (fillargs.ifindex) {
5238 dev = __dev_get_by_index(tgt_net, fillargs.ifindex);
5243 idev = __in6_dev_get(dev);
5245 err = in6_dump_addrs(idev, skb, cb, s_ip_idx,
5255 cb->seq = atomic_read(&tgt_net->ipv6.dev_addr_genid) ^ tgt_net->dev_base_seq;
5256 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5258 head = &tgt_net->dev_index_head[h];
5259 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5262 if (h > s_h || idx > s_idx)
5264 idev = __in6_dev_get(dev);
5268 if (in6_dump_addrs(idev, skb, cb, s_ip_idx,
5280 if (fillargs.netnsid >= 0)
5283 return skb->len ? : err;
5286 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
5288 enum addr_type_t type = UNICAST_ADDR;
5290 return inet6_dump_addr(skb, cb, type);
5293 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
5295 enum addr_type_t type = MULTICAST_ADDR;
5297 return inet6_dump_addr(skb, cb, type);
5301 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
5303 enum addr_type_t type = ANYCAST_ADDR;
5305 return inet6_dump_addr(skb, cb, type);
5308 static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb,
5309 const struct nlmsghdr *nlh,
5311 struct netlink_ext_ack *extack)
5313 struct ifaddrmsg *ifm;
5316 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5317 NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request");
5321 if (!netlink_strict_get_check(skb))
5322 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
5323 ifa_ipv6_policy, extack);
5325 ifm = nlmsg_data(nlh);
5326 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5327 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request");
5331 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5332 ifa_ipv6_policy, extack);
5336 for (i = 0; i <= IFA_MAX; i++) {
5341 case IFA_TARGET_NETNSID:
5346 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request");
5354 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
5355 struct netlink_ext_ack *extack)
5357 struct net *net = sock_net(in_skb->sk);
5358 struct inet6_fill_args fillargs = {
5359 .portid = NETLINK_CB(in_skb).portid,
5360 .seq = nlh->nlmsg_seq,
5361 .event = RTM_NEWADDR,
5365 struct net *tgt_net = net;
5366 struct ifaddrmsg *ifm;
5367 struct nlattr *tb[IFA_MAX+1];
5368 struct in6_addr *addr = NULL, *peer;
5369 struct net_device *dev = NULL;
5370 struct inet6_ifaddr *ifa;
5371 struct sk_buff *skb;
5374 err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack);
5378 if (tb[IFA_TARGET_NETNSID]) {
5379 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]);
5381 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk,
5383 if (IS_ERR(tgt_net))
5384 return PTR_ERR(tgt_net);
5387 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
5391 ifm = nlmsg_data(nlh);
5393 dev = dev_get_by_index(tgt_net, ifm->ifa_index);
5395 ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1);
5397 err = -EADDRNOTAVAIL;
5401 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
5407 err = inet6_fill_ifaddr(skb, ifa, &fillargs);
5409 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5410 WARN_ON(err == -EMSGSIZE);
5414 err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid);
5420 if (fillargs.netnsid >= 0)
5426 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
5428 struct sk_buff *skb;
5429 struct net *net = dev_net(ifa->idev->dev);
5430 struct inet6_fill_args fillargs = {
5439 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5443 err = inet6_fill_ifaddr(skb, ifa, &fillargs);
5445 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5446 WARN_ON(err == -EMSGSIZE);
5450 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
5454 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
5457 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
5458 __s32 *array, int bytes)
5460 BUG_ON(bytes < (DEVCONF_MAX * 4));
5462 memset(array, 0, bytes);
5463 array[DEVCONF_FORWARDING] = cnf->forwarding;
5464 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
5465 array[DEVCONF_MTU6] = cnf->mtu6;
5466 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
5467 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
5468 array[DEVCONF_AUTOCONF] = cnf->autoconf;
5469 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
5470 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
5471 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
5472 jiffies_to_msecs(cnf->rtr_solicit_interval);
5473 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
5474 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
5475 array[DEVCONF_RTR_SOLICIT_DELAY] =
5476 jiffies_to_msecs(cnf->rtr_solicit_delay);
5477 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
5478 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
5479 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
5480 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
5481 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
5482 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
5483 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
5484 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
5485 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
5486 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
5487 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
5488 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
5489 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
5490 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
5491 #ifdef CONFIG_IPV6_ROUTER_PREF
5492 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
5493 array[DEVCONF_RTR_PROBE_INTERVAL] =
5494 jiffies_to_msecs(cnf->rtr_probe_interval);
5495 #ifdef CONFIG_IPV6_ROUTE_INFO
5496 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen;
5497 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
5500 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
5501 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
5502 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5503 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
5504 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
5506 #ifdef CONFIG_IPV6_MROUTE
5507 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
5509 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
5510 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
5511 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5512 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
5513 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
5514 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
5515 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
5516 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
5517 /* we omit DEVCONF_STABLE_SECRET for now */
5518 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
5519 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
5520 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
5521 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
5522 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled;
5523 #ifdef CONFIG_IPV6_SEG6_HMAC
5524 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac;
5526 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad;
5527 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode;
5528 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy;
5529 array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass;
5530 array[DEVCONF_RPL_SEG_ENABLED] = cnf->rpl_seg_enabled;
5533 static inline size_t inet6_ifla6_size(void)
5535 return nla_total_size(4) /* IFLA_INET6_FLAGS */
5536 + nla_total_size(sizeof(struct ifla_cacheinfo))
5537 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5538 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
5539 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
5540 + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */
5541 + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */
5545 static inline size_t inet6_if_nlmsg_size(void)
5547 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5548 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5549 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5550 + nla_total_size(4) /* IFLA_MTU */
5551 + nla_total_size(4) /* IFLA_LINK */
5552 + nla_total_size(1) /* IFLA_OPERSTATE */
5553 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
5556 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
5560 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
5563 /* Use put_unaligned() because stats may not be aligned for u64. */
5564 put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5565 for (i = 1; i < ICMP6_MIB_MAX; i++)
5566 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
5568 memset(&stats[ICMP6_MIB_MAX], 0, pad);
5571 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
5572 int bytes, size_t syncpoff)
5575 u64 buff[IPSTATS_MIB_MAX];
5576 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5580 memset(buff, 0, sizeof(buff));
5581 buff[0] = IPSTATS_MIB_MAX;
5583 for_each_possible_cpu(c) {
5584 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5585 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5588 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5589 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
5592 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5596 case IFLA_INET6_STATS:
5597 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5598 offsetof(struct ipstats_mib, syncp));
5600 case IFLA_INET6_ICMP6STATS:
5601 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
5606 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5607 u32 ext_filter_mask)
5610 struct ifla_cacheinfo ci;
5612 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5613 goto nla_put_failure;
5614 ci.max_reasm_len = IPV6_MAXPLEN;
5615 ci.tstamp = cstamp_delta(idev->tstamp);
5616 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
5617 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
5618 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5619 goto nla_put_failure;
5620 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
5622 goto nla_put_failure;
5623 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5625 /* XXX - MC not implemented */
5627 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5630 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
5632 goto nla_put_failure;
5633 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5635 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
5637 goto nla_put_failure;
5638 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5640 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
5642 goto nla_put_failure;
5643 read_lock_bh(&idev->lock);
5644 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5645 read_unlock_bh(&idev->lock);
5647 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode))
5648 goto nla_put_failure;
5656 static size_t inet6_get_link_af_size(const struct net_device *dev,
5657 u32 ext_filter_mask)
5659 if (!__in6_dev_get(dev))
5662 return inet6_ifla6_size();
5665 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5666 u32 ext_filter_mask)
5668 struct inet6_dev *idev = __in6_dev_get(dev);
5673 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
5679 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
5681 struct inet6_ifaddr *ifp;
5682 struct net_device *dev = idev->dev;
5683 bool clear_token, update_rs = false;
5684 struct in6_addr ll_addr;
5690 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5692 if (!ipv6_accept_ra(idev))
5694 if (idev->cnf.rtr_solicits == 0)
5697 write_lock_bh(&idev->lock);
5699 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5700 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5702 write_unlock_bh(&idev->lock);
5704 clear_token = ipv6_addr_any(token);
5708 if (!idev->dead && (idev->if_flags & IF_READY) &&
5709 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5710 IFA_F_OPTIMISTIC)) {
5711 /* If we're not ready, then normal ifup will take care
5712 * of this. Otherwise, we need to request our rs here.
5714 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5719 write_lock_bh(&idev->lock);
5722 idev->if_flags |= IF_RS_SENT;
5723 idev->rs_interval = rfc3315_s14_backoff_init(
5724 idev->cnf.rtr_solicit_interval);
5725 idev->rs_probes = 1;
5726 addrconf_mod_rs_timer(idev, idev->rs_interval);
5729 /* Well, that's kinda nasty ... */
5730 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5731 spin_lock(&ifp->lock);
5732 if (ifp->tokenized) {
5734 ifp->prefered_lft = 0;
5736 spin_unlock(&ifp->lock);
5739 write_unlock_bh(&idev->lock);
5740 inet6_ifinfo_notify(RTM_NEWLINK, idev);
5741 addrconf_verify_rtnl();
5745 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5746 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5747 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5750 static int check_addr_gen_mode(int mode)
5752 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5753 mode != IN6_ADDR_GEN_MODE_NONE &&
5754 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5755 mode != IN6_ADDR_GEN_MODE_RANDOM)
5760 static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5763 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5764 !idev->cnf.stable_secret.initialized &&
5765 !net->ipv6.devconf_dflt->stable_secret.initialized)
5770 static int inet6_validate_link_af(const struct net_device *dev,
5771 const struct nlattr *nla)
5773 struct nlattr *tb[IFLA_INET6_MAX + 1];
5774 struct inet6_dev *idev = NULL;
5778 idev = __in6_dev_get(dev);
5780 return -EAFNOSUPPORT;
5783 err = nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla,
5784 inet6_af_policy, NULL);
5788 if (!tb[IFLA_INET6_TOKEN] && !tb[IFLA_INET6_ADDR_GEN_MODE])
5791 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5792 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5794 if (check_addr_gen_mode(mode) < 0)
5796 if (dev && check_stable_privacy(idev, dev_net(dev), mode) < 0)
5803 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5805 struct inet6_dev *idev = __in6_dev_get(dev);
5806 struct nlattr *tb[IFLA_INET6_MAX + 1];
5810 return -EAFNOSUPPORT;
5812 if (nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0)
5815 if (tb[IFLA_INET6_TOKEN]) {
5816 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
5821 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5822 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5824 idev->cnf.addr_gen_mode = mode;
5830 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
5831 u32 portid, u32 seq, int event, unsigned int flags)
5833 struct net_device *dev = idev->dev;
5834 struct ifinfomsg *hdr;
5835 struct nlmsghdr *nlh;
5838 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
5842 hdr = nlmsg_data(nlh);
5843 hdr->ifi_family = AF_INET6;
5845 hdr->ifi_type = dev->type;
5846 hdr->ifi_index = dev->ifindex;
5847 hdr->ifi_flags = dev_get_flags(dev);
5848 hdr->ifi_change = 0;
5850 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5852 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5853 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
5854 (dev->ifindex != dev_get_iflink(dev) &&
5855 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5856 nla_put_u8(skb, IFLA_OPERSTATE,
5857 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
5858 goto nla_put_failure;
5859 protoinfo = nla_nest_start_noflag(skb, IFLA_PROTINFO);
5861 goto nla_put_failure;
5863 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
5864 goto nla_put_failure;
5866 nla_nest_end(skb, protoinfo);
5867 nlmsg_end(skb, nlh);
5871 nlmsg_cancel(skb, nlh);
5875 static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh,
5876 struct netlink_ext_ack *extack)
5878 struct ifinfomsg *ifm;
5880 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5881 NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request");
5885 if (nlmsg_attrlen(nlh, sizeof(*ifm))) {
5886 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header");
5890 ifm = nlmsg_data(nlh);
5891 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
5892 ifm->ifi_change || ifm->ifi_index) {
5893 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request");
5900 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5902 struct net *net = sock_net(skb->sk);
5905 struct net_device *dev;
5906 struct inet6_dev *idev;
5907 struct hlist_head *head;
5909 /* only requests using strict checking can pass data to
5910 * influence the dump
5912 if (cb->strict_check) {
5913 int err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack);
5920 s_idx = cb->args[1];
5923 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5925 head = &net->dev_index_head[h];
5926 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5929 idev = __in6_dev_get(dev);
5932 if (inet6_fill_ifinfo(skb, idev,
5933 NETLINK_CB(cb->skb).portid,
5935 RTM_NEWLINK, NLM_F_MULTI) < 0)
5949 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5951 struct sk_buff *skb;
5952 struct net *net = dev_net(idev->dev);
5955 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
5959 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
5961 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5962 WARN_ON(err == -EMSGSIZE);
5966 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
5970 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
5973 static inline size_t inet6_prefix_nlmsg_size(void)
5975 return NLMSG_ALIGN(sizeof(struct prefixmsg))
5976 + nla_total_size(sizeof(struct in6_addr))
5977 + nla_total_size(sizeof(struct prefix_cacheinfo));
5980 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
5981 struct prefix_info *pinfo, u32 portid, u32 seq,
5982 int event, unsigned int flags)
5984 struct prefixmsg *pmsg;
5985 struct nlmsghdr *nlh;
5986 struct prefix_cacheinfo ci;
5988 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
5992 pmsg = nlmsg_data(nlh);
5993 pmsg->prefix_family = AF_INET6;
5994 pmsg->prefix_pad1 = 0;
5995 pmsg->prefix_pad2 = 0;
5996 pmsg->prefix_ifindex = idev->dev->ifindex;
5997 pmsg->prefix_len = pinfo->prefix_len;
5998 pmsg->prefix_type = pinfo->type;
5999 pmsg->prefix_pad3 = 0;
6000 pmsg->prefix_flags = 0;
6002 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
6003 if (pinfo->autoconf)
6004 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
6006 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
6007 goto nla_put_failure;
6008 ci.preferred_time = ntohl(pinfo->prefered);
6009 ci.valid_time = ntohl(pinfo->valid);
6010 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
6011 goto nla_put_failure;
6012 nlmsg_end(skb, nlh);
6016 nlmsg_cancel(skb, nlh);
6020 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
6021 struct prefix_info *pinfo)
6023 struct sk_buff *skb;
6024 struct net *net = dev_net(idev->dev);
6027 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
6031 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
6033 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
6034 WARN_ON(err == -EMSGSIZE);
6038 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
6042 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
6045 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
6047 struct net *net = dev_net(ifp->idev->dev);
6052 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
6057 * If the address was optimistic we inserted the route at the
6058 * start of our DAD process, so we don't need to do it again.
6059 * If the device was taken down in the middle of the DAD
6060 * cycle there is a race where we could get here without a
6061 * host route, so nothing to insert. That will be fixed when
6062 * the device is brought up.
6064 if (ifp->rt && !rcu_access_pointer(ifp->rt->fib6_node)) {
6065 ip6_ins_rt(net, ifp->rt);
6066 } else if (!ifp->rt && (ifp->idev->dev->flags & IFF_UP)) {
6067 pr_warn("BUG: Address %pI6c on device %s is missing its host route.\n",
6068 &ifp->addr, ifp->idev->dev->name);
6071 if (ifp->idev->cnf.forwarding)
6072 addrconf_join_anycast(ifp);
6073 if (!ipv6_addr_any(&ifp->peer_addr))
6074 addrconf_prefix_route(&ifp->peer_addr, 128,
6075 ifp->rt_priority, ifp->idev->dev,
6079 if (ifp->idev->cnf.forwarding)
6080 addrconf_leave_anycast(ifp);
6081 addrconf_leave_solict(ifp->idev, &ifp->addr);
6082 if (!ipv6_addr_any(&ifp->peer_addr)) {
6083 struct fib6_info *rt;
6085 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
6086 ifp->idev->dev, 0, 0,
6089 ip6_del_rt(net, rt);
6092 ip6_del_rt(net, ifp->rt);
6095 rt_genid_bump_ipv6(net);
6098 atomic_inc(&net->ipv6.dev_addr_genid);
6101 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
6104 if (likely(ifp->idev->dead == 0))
6105 __ipv6_ifa_notify(event, ifp);
6106 rcu_read_unlock_bh();
6109 #ifdef CONFIG_SYSCTL
6111 static int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
6112 void *buffer, size_t *lenp, loff_t *ppos)
6114 int *valp = ctl->data;
6117 struct ctl_table lctl;
6121 * ctl->data points to idev->cnf.forwarding, we should
6122 * not modify it until we get the rtnl lock.
6127 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6130 ret = addrconf_fixup_forwarding(ctl, valp, val);
6136 static int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
6137 void *buffer, size_t *lenp, loff_t *ppos)
6139 struct inet6_dev *idev = ctl->extra1;
6140 int min_mtu = IPV6_MIN_MTU;
6141 struct ctl_table lctl;
6144 lctl.extra1 = &min_mtu;
6145 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
6147 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
6150 static void dev_disable_change(struct inet6_dev *idev)
6152 struct netdev_notifier_info info;
6154 if (!idev || !idev->dev)
6157 netdev_notifier_info_init(&info, idev->dev);
6158 if (idev->cnf.disable_ipv6)
6159 addrconf_notify(NULL, NETDEV_DOWN, &info);
6161 addrconf_notify(NULL, NETDEV_UP, &info);
6164 static void addrconf_disable_change(struct net *net, __s32 newf)
6166 struct net_device *dev;
6167 struct inet6_dev *idev;
6169 for_each_netdev(net, dev) {
6170 idev = __in6_dev_get(dev);
6172 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
6173 idev->cnf.disable_ipv6 = newf;
6175 dev_disable_change(idev);
6180 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
6185 if (!rtnl_trylock())
6186 return restart_syscall();
6188 net = (struct net *)table->extra2;
6192 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
6197 if (p == &net->ipv6.devconf_all->disable_ipv6) {
6198 net->ipv6.devconf_dflt->disable_ipv6 = newf;
6199 addrconf_disable_change(net, newf);
6200 } else if ((!newf) ^ (!old))
6201 dev_disable_change((struct inet6_dev *)table->extra1);
6207 static int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
6208 void *buffer, size_t *lenp, loff_t *ppos)
6210 int *valp = ctl->data;
6213 struct ctl_table lctl;
6217 * ctl->data points to idev->cnf.disable_ipv6, we should
6218 * not modify it until we get the rtnl lock.
6223 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6226 ret = addrconf_disable_ipv6(ctl, valp, val);
6232 static int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
6233 void *buffer, size_t *lenp, loff_t *ppos)
6235 int *valp = ctl->data;
6240 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
6243 if (write && old != new) {
6244 struct net *net = ctl->extra2;
6246 if (!rtnl_trylock())
6247 return restart_syscall();
6249 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
6250 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6251 NETCONFA_PROXY_NEIGH,
6252 NETCONFA_IFINDEX_DEFAULT,
6253 net->ipv6.devconf_dflt);
6254 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
6255 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6256 NETCONFA_PROXY_NEIGH,
6257 NETCONFA_IFINDEX_ALL,
6258 net->ipv6.devconf_all);
6260 struct inet6_dev *idev = ctl->extra1;
6262 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6263 NETCONFA_PROXY_NEIGH,
6273 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
6274 void *buffer, size_t *lenp,
6279 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
6280 struct net *net = (struct net *)ctl->extra2;
6281 struct ctl_table tmp = {
6283 .maxlen = sizeof(new_val),
6287 if (!rtnl_trylock())
6288 return restart_syscall();
6290 new_val = *((u32 *)ctl->data);
6292 ret = proc_douintvec(&tmp, write, buffer, lenp, ppos);
6297 if (check_addr_gen_mode(new_val) < 0) {
6303 if (check_stable_privacy(idev, net, new_val) < 0) {
6308 if (idev->cnf.addr_gen_mode != new_val) {
6309 idev->cnf.addr_gen_mode = new_val;
6310 addrconf_dev_config(idev->dev);
6312 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) {
6313 struct net_device *dev;
6315 net->ipv6.devconf_dflt->addr_gen_mode = new_val;
6316 for_each_netdev(net, dev) {
6317 idev = __in6_dev_get(dev);
6319 idev->cnf.addr_gen_mode != new_val) {
6320 idev->cnf.addr_gen_mode = new_val;
6321 addrconf_dev_config(idev->dev);
6326 *((u32 *)ctl->data) = new_val;
6335 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
6336 void *buffer, size_t *lenp,
6340 struct in6_addr addr;
6341 char str[IPV6_MAX_STRLEN];
6342 struct ctl_table lctl = *ctl;
6343 struct net *net = ctl->extra2;
6344 struct ipv6_stable_secret *secret = ctl->data;
6346 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
6349 lctl.maxlen = IPV6_MAX_STRLEN;
6352 if (!rtnl_trylock())
6353 return restart_syscall();
6355 if (!write && !secret->initialized) {
6360 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
6361 if (err >= sizeof(str)) {
6366 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
6370 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
6375 secret->initialized = true;
6376 secret->secret = addr;
6378 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
6379 struct net_device *dev;
6381 for_each_netdev(net, dev) {
6382 struct inet6_dev *idev = __in6_dev_get(dev);
6385 idev->cnf.addr_gen_mode =
6386 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
6390 struct inet6_dev *idev = ctl->extra1;
6392 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
6402 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
6403 int write, void *buffer,
6407 int *valp = ctl->data;
6410 struct ctl_table lctl;
6413 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
6414 * we should not modify it until we get the rtnl lock.
6419 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6422 ret = addrconf_fixup_linkdown(ctl, valp, val);
6429 void addrconf_set_nopolicy(struct rt6_info *rt, int action)
6433 rt->dst.flags |= DST_NOPOLICY;
6435 rt->dst.flags &= ~DST_NOPOLICY;
6440 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
6442 struct inet6_ifaddr *ifa;
6444 read_lock_bh(&idev->lock);
6445 list_for_each_entry(ifa, &idev->addr_list, if_list) {
6446 spin_lock(&ifa->lock);
6448 /* host routes only use builtin fib6_nh */
6449 struct fib6_nh *nh = ifa->rt->fib6_nh;
6453 ifa->rt->dst_nopolicy = val ? true : false;
6454 if (nh->rt6i_pcpu) {
6455 for_each_possible_cpu(cpu) {
6456 struct rt6_info **rtp;
6458 rtp = per_cpu_ptr(nh->rt6i_pcpu, cpu);
6459 addrconf_set_nopolicy(*rtp, val);
6464 spin_unlock(&ifa->lock);
6466 read_unlock_bh(&idev->lock);
6470 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val)
6472 struct inet6_dev *idev;
6475 if (!rtnl_trylock())
6476 return restart_syscall();
6480 net = (struct net *)ctl->extra2;
6481 if (valp == &net->ipv6.devconf_dflt->disable_policy) {
6486 if (valp == &net->ipv6.devconf_all->disable_policy) {
6487 struct net_device *dev;
6489 for_each_netdev(net, dev) {
6490 idev = __in6_dev_get(dev);
6492 addrconf_disable_policy_idev(idev, val);
6495 idev = (struct inet6_dev *)ctl->extra1;
6496 addrconf_disable_policy_idev(idev, val);
6503 static int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write,
6504 void *buffer, size_t *lenp, loff_t *ppos)
6506 int *valp = ctl->data;
6509 struct ctl_table lctl;
6514 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6516 if (write && (*valp != val))
6517 ret = addrconf_disable_policy(ctl, valp, val);
6525 static int minus_one = -1;
6526 static const int two_five_five = 255;
6528 static const struct ctl_table addrconf_sysctl[] = {
6530 .procname = "forwarding",
6531 .data = &ipv6_devconf.forwarding,
6532 .maxlen = sizeof(int),
6534 .proc_handler = addrconf_sysctl_forward,
6537 .procname = "hop_limit",
6538 .data = &ipv6_devconf.hop_limit,
6539 .maxlen = sizeof(int),
6541 .proc_handler = proc_dointvec_minmax,
6542 .extra1 = (void *)SYSCTL_ONE,
6543 .extra2 = (void *)&two_five_five,
6547 .data = &ipv6_devconf.mtu6,
6548 .maxlen = sizeof(int),
6550 .proc_handler = addrconf_sysctl_mtu,
6553 .procname = "accept_ra",
6554 .data = &ipv6_devconf.accept_ra,
6555 .maxlen = sizeof(int),
6557 .proc_handler = proc_dointvec,
6560 .procname = "accept_redirects",
6561 .data = &ipv6_devconf.accept_redirects,
6562 .maxlen = sizeof(int),
6564 .proc_handler = proc_dointvec,
6567 .procname = "autoconf",
6568 .data = &ipv6_devconf.autoconf,
6569 .maxlen = sizeof(int),
6571 .proc_handler = proc_dointvec,
6574 .procname = "dad_transmits",
6575 .data = &ipv6_devconf.dad_transmits,
6576 .maxlen = sizeof(int),
6578 .proc_handler = proc_dointvec,
6581 .procname = "router_solicitations",
6582 .data = &ipv6_devconf.rtr_solicits,
6583 .maxlen = sizeof(int),
6585 .proc_handler = proc_dointvec_minmax,
6586 .extra1 = &minus_one,
6589 .procname = "router_solicitation_interval",
6590 .data = &ipv6_devconf.rtr_solicit_interval,
6591 .maxlen = sizeof(int),
6593 .proc_handler = proc_dointvec_jiffies,
6596 .procname = "router_solicitation_max_interval",
6597 .data = &ipv6_devconf.rtr_solicit_max_interval,
6598 .maxlen = sizeof(int),
6600 .proc_handler = proc_dointvec_jiffies,
6603 .procname = "router_solicitation_delay",
6604 .data = &ipv6_devconf.rtr_solicit_delay,
6605 .maxlen = sizeof(int),
6607 .proc_handler = proc_dointvec_jiffies,
6610 .procname = "force_mld_version",
6611 .data = &ipv6_devconf.force_mld_version,
6612 .maxlen = sizeof(int),
6614 .proc_handler = proc_dointvec,
6617 .procname = "mldv1_unsolicited_report_interval",
6619 &ipv6_devconf.mldv1_unsolicited_report_interval,
6620 .maxlen = sizeof(int),
6622 .proc_handler = proc_dointvec_ms_jiffies,
6625 .procname = "mldv2_unsolicited_report_interval",
6627 &ipv6_devconf.mldv2_unsolicited_report_interval,
6628 .maxlen = sizeof(int),
6630 .proc_handler = proc_dointvec_ms_jiffies,
6633 .procname = "use_tempaddr",
6634 .data = &ipv6_devconf.use_tempaddr,
6635 .maxlen = sizeof(int),
6637 .proc_handler = proc_dointvec,
6640 .procname = "temp_valid_lft",
6641 .data = &ipv6_devconf.temp_valid_lft,
6642 .maxlen = sizeof(int),
6644 .proc_handler = proc_dointvec,
6647 .procname = "temp_prefered_lft",
6648 .data = &ipv6_devconf.temp_prefered_lft,
6649 .maxlen = sizeof(int),
6651 .proc_handler = proc_dointvec,
6654 .procname = "regen_max_retry",
6655 .data = &ipv6_devconf.regen_max_retry,
6656 .maxlen = sizeof(int),
6658 .proc_handler = proc_dointvec,
6661 .procname = "max_desync_factor",
6662 .data = &ipv6_devconf.max_desync_factor,
6663 .maxlen = sizeof(int),
6665 .proc_handler = proc_dointvec,
6668 .procname = "max_addresses",
6669 .data = &ipv6_devconf.max_addresses,
6670 .maxlen = sizeof(int),
6672 .proc_handler = proc_dointvec,
6675 .procname = "accept_ra_defrtr",
6676 .data = &ipv6_devconf.accept_ra_defrtr,
6677 .maxlen = sizeof(int),
6679 .proc_handler = proc_dointvec,
6682 .procname = "accept_ra_min_hop_limit",
6683 .data = &ipv6_devconf.accept_ra_min_hop_limit,
6684 .maxlen = sizeof(int),
6686 .proc_handler = proc_dointvec,
6689 .procname = "accept_ra_pinfo",
6690 .data = &ipv6_devconf.accept_ra_pinfo,
6691 .maxlen = sizeof(int),
6693 .proc_handler = proc_dointvec,
6695 #ifdef CONFIG_IPV6_ROUTER_PREF
6697 .procname = "accept_ra_rtr_pref",
6698 .data = &ipv6_devconf.accept_ra_rtr_pref,
6699 .maxlen = sizeof(int),
6701 .proc_handler = proc_dointvec,
6704 .procname = "router_probe_interval",
6705 .data = &ipv6_devconf.rtr_probe_interval,
6706 .maxlen = sizeof(int),
6708 .proc_handler = proc_dointvec_jiffies,
6710 #ifdef CONFIG_IPV6_ROUTE_INFO
6712 .procname = "accept_ra_rt_info_min_plen",
6713 .data = &ipv6_devconf.accept_ra_rt_info_min_plen,
6714 .maxlen = sizeof(int),
6716 .proc_handler = proc_dointvec,
6719 .procname = "accept_ra_rt_info_max_plen",
6720 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
6721 .maxlen = sizeof(int),
6723 .proc_handler = proc_dointvec,
6728 .procname = "proxy_ndp",
6729 .data = &ipv6_devconf.proxy_ndp,
6730 .maxlen = sizeof(int),
6732 .proc_handler = addrconf_sysctl_proxy_ndp,
6735 .procname = "accept_source_route",
6736 .data = &ipv6_devconf.accept_source_route,
6737 .maxlen = sizeof(int),
6739 .proc_handler = proc_dointvec,
6741 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
6743 .procname = "optimistic_dad",
6744 .data = &ipv6_devconf.optimistic_dad,
6745 .maxlen = sizeof(int),
6747 .proc_handler = proc_dointvec,
6750 .procname = "use_optimistic",
6751 .data = &ipv6_devconf.use_optimistic,
6752 .maxlen = sizeof(int),
6754 .proc_handler = proc_dointvec,
6757 #ifdef CONFIG_IPV6_MROUTE
6759 .procname = "mc_forwarding",
6760 .data = &ipv6_devconf.mc_forwarding,
6761 .maxlen = sizeof(int),
6763 .proc_handler = proc_dointvec,
6767 .procname = "disable_ipv6",
6768 .data = &ipv6_devconf.disable_ipv6,
6769 .maxlen = sizeof(int),
6771 .proc_handler = addrconf_sysctl_disable,
6774 .procname = "accept_dad",
6775 .data = &ipv6_devconf.accept_dad,
6776 .maxlen = sizeof(int),
6778 .proc_handler = proc_dointvec,
6781 .procname = "force_tllao",
6782 .data = &ipv6_devconf.force_tllao,
6783 .maxlen = sizeof(int),
6785 .proc_handler = proc_dointvec
6788 .procname = "ndisc_notify",
6789 .data = &ipv6_devconf.ndisc_notify,
6790 .maxlen = sizeof(int),
6792 .proc_handler = proc_dointvec
6795 .procname = "suppress_frag_ndisc",
6796 .data = &ipv6_devconf.suppress_frag_ndisc,
6797 .maxlen = sizeof(int),
6799 .proc_handler = proc_dointvec
6802 .procname = "accept_ra_from_local",
6803 .data = &ipv6_devconf.accept_ra_from_local,
6804 .maxlen = sizeof(int),
6806 .proc_handler = proc_dointvec,
6809 .procname = "accept_ra_mtu",
6810 .data = &ipv6_devconf.accept_ra_mtu,
6811 .maxlen = sizeof(int),
6813 .proc_handler = proc_dointvec,
6816 .procname = "stable_secret",
6817 .data = &ipv6_devconf.stable_secret,
6818 .maxlen = IPV6_MAX_STRLEN,
6820 .proc_handler = addrconf_sysctl_stable_secret,
6823 .procname = "use_oif_addrs_only",
6824 .data = &ipv6_devconf.use_oif_addrs_only,
6825 .maxlen = sizeof(int),
6827 .proc_handler = proc_dointvec,
6830 .procname = "ignore_routes_with_linkdown",
6831 .data = &ipv6_devconf.ignore_routes_with_linkdown,
6832 .maxlen = sizeof(int),
6834 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
6837 .procname = "drop_unicast_in_l2_multicast",
6838 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
6839 .maxlen = sizeof(int),
6841 .proc_handler = proc_dointvec,
6844 .procname = "drop_unsolicited_na",
6845 .data = &ipv6_devconf.drop_unsolicited_na,
6846 .maxlen = sizeof(int),
6848 .proc_handler = proc_dointvec,
6851 .procname = "keep_addr_on_down",
6852 .data = &ipv6_devconf.keep_addr_on_down,
6853 .maxlen = sizeof(int),
6855 .proc_handler = proc_dointvec,
6859 .procname = "seg6_enabled",
6860 .data = &ipv6_devconf.seg6_enabled,
6861 .maxlen = sizeof(int),
6863 .proc_handler = proc_dointvec,
6865 #ifdef CONFIG_IPV6_SEG6_HMAC
6867 .procname = "seg6_require_hmac",
6868 .data = &ipv6_devconf.seg6_require_hmac,
6869 .maxlen = sizeof(int),
6871 .proc_handler = proc_dointvec,
6875 .procname = "enhanced_dad",
6876 .data = &ipv6_devconf.enhanced_dad,
6877 .maxlen = sizeof(int),
6879 .proc_handler = proc_dointvec,
6882 .procname = "addr_gen_mode",
6883 .data = &ipv6_devconf.addr_gen_mode,
6884 .maxlen = sizeof(int),
6886 .proc_handler = addrconf_sysctl_addr_gen_mode,
6889 .procname = "disable_policy",
6890 .data = &ipv6_devconf.disable_policy,
6891 .maxlen = sizeof(int),
6893 .proc_handler = addrconf_sysctl_disable_policy,
6896 .procname = "ndisc_tclass",
6897 .data = &ipv6_devconf.ndisc_tclass,
6898 .maxlen = sizeof(int),
6900 .proc_handler = proc_dointvec_minmax,
6901 .extra1 = (void *)SYSCTL_ZERO,
6902 .extra2 = (void *)&two_five_five,
6905 .procname = "rpl_seg_enabled",
6906 .data = &ipv6_devconf.rpl_seg_enabled,
6907 .maxlen = sizeof(int),
6909 .proc_handler = proc_dointvec,
6916 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
6917 struct inet6_dev *idev, struct ipv6_devconf *p)
6920 struct ctl_table *table;
6921 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
6923 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
6927 for (i = 0; table[i].data; i++) {
6928 table[i].data += (char *)p - (char *)&ipv6_devconf;
6929 /* If one of these is already set, then it is not safe to
6930 * overwrite either of them: this makes proc_dointvec_minmax
6933 if (!table[i].extra1 && !table[i].extra2) {
6934 table[i].extra1 = idev; /* embedded; no ref */
6935 table[i].extra2 = net;
6939 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
6941 p->sysctl_header = register_net_sysctl(net, path, table);
6942 if (!p->sysctl_header)
6945 if (!strcmp(dev_name, "all"))
6946 ifindex = NETCONFA_IFINDEX_ALL;
6947 else if (!strcmp(dev_name, "default"))
6948 ifindex = NETCONFA_IFINDEX_DEFAULT;
6950 ifindex = idev->dev->ifindex;
6951 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
6961 static void __addrconf_sysctl_unregister(struct net *net,
6962 struct ipv6_devconf *p, int ifindex)
6964 struct ctl_table *table;
6966 if (!p->sysctl_header)
6969 table = p->sysctl_header->ctl_table_arg;
6970 unregister_net_sysctl_table(p->sysctl_header);
6971 p->sysctl_header = NULL;
6974 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
6977 static int addrconf_sysctl_register(struct inet6_dev *idev)
6981 if (!sysctl_dev_name_is_allowed(idev->dev->name))
6984 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
6985 &ndisc_ifinfo_sysctl_change);
6988 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
6991 neigh_sysctl_unregister(idev->nd_parms);
6996 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
6998 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf,
6999 idev->dev->ifindex);
7000 neigh_sysctl_unregister(idev->nd_parms);
7006 static int __net_init addrconf_init_net(struct net *net)
7009 struct ipv6_devconf *all, *dflt;
7011 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
7015 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
7017 goto err_alloc_dflt;
7019 if (IS_ENABLED(CONFIG_SYSCTL) &&
7020 sysctl_devconf_inherit_init_net == 1 && !net_eq(net, &init_net)) {
7021 memcpy(all, init_net.ipv6.devconf_all, sizeof(ipv6_devconf));
7022 memcpy(dflt, init_net.ipv6.devconf_dflt, sizeof(ipv6_devconf_dflt));
7025 /* these will be inherited by all namespaces */
7026 dflt->autoconf = ipv6_defaults.autoconf;
7027 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
7029 dflt->stable_secret.initialized = false;
7030 all->stable_secret.initialized = false;
7032 net->ipv6.devconf_all = all;
7033 net->ipv6.devconf_dflt = dflt;
7035 #ifdef CONFIG_SYSCTL
7036 err = __addrconf_sysctl_register(net, "all", NULL, all);
7040 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
7046 #ifdef CONFIG_SYSCTL
7048 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
7058 static void __net_exit addrconf_exit_net(struct net *net)
7060 #ifdef CONFIG_SYSCTL
7061 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt,
7062 NETCONFA_IFINDEX_DEFAULT);
7063 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all,
7064 NETCONFA_IFINDEX_ALL);
7066 kfree(net->ipv6.devconf_dflt);
7067 kfree(net->ipv6.devconf_all);
7070 static struct pernet_operations addrconf_ops = {
7071 .init = addrconf_init_net,
7072 .exit = addrconf_exit_net,
7075 static struct rtnl_af_ops inet6_ops __read_mostly = {
7077 .fill_link_af = inet6_fill_link_af,
7078 .get_link_af_size = inet6_get_link_af_size,
7079 .validate_link_af = inet6_validate_link_af,
7080 .set_link_af = inet6_set_link_af,
7084 * Init / cleanup code
7087 int __init addrconf_init(void)
7089 struct inet6_dev *idev;
7092 err = ipv6_addr_label_init();
7094 pr_crit("%s: cannot initialize default policy table: %d\n",
7099 err = register_pernet_subsys(&addrconf_ops);
7103 addrconf_wq = create_workqueue("ipv6_addrconf");
7109 /* The addrconf netdev notifier requires that loopback_dev
7110 * has it's ipv6 private information allocated and setup
7111 * before it can bring up and give link-local addresses
7112 * to other devices which are up.
7114 * Unfortunately, loopback_dev is not necessarily the first
7115 * entry in the global dev_base list of net devices. In fact,
7116 * it is likely to be the very last entry on that list.
7117 * So this causes the notifier registry below to try and
7118 * give link-local addresses to all devices besides loopback_dev
7119 * first, then loopback_dev, which cases all the non-loopback_dev
7120 * devices to fail to get a link-local address.
7122 * So, as a temporary fix, allocate the ipv6 structure for
7123 * loopback_dev first by hand.
7124 * Longer term, all of the dependencies ipv6 has upon the loopback
7125 * device and it being up should be removed.
7128 idev = ipv6_add_dev(init_net.loopback_dev);
7131 err = PTR_ERR(idev);
7135 ip6_route_init_special_entries();
7137 for (i = 0; i < IN6_ADDR_HSIZE; i++)
7138 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
7140 register_netdevice_notifier(&ipv6_dev_notf);
7144 rtnl_af_register(&inet6_ops);
7146 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK,
7147 NULL, inet6_dump_ifinfo, 0);
7151 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR,
7152 inet6_rtm_newaddr, NULL, 0);
7155 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR,
7156 inet6_rtm_deladdr, NULL, 0);
7159 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR,
7160 inet6_rtm_getaddr, inet6_dump_ifaddr,
7161 RTNL_FLAG_DOIT_UNLOCKED);
7164 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST,
7165 NULL, inet6_dump_ifmcaddr, 0);
7168 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST,
7169 NULL, inet6_dump_ifacaddr, 0);
7172 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF,
7173 inet6_netconf_get_devconf,
7174 inet6_netconf_dump_devconf,
7175 RTNL_FLAG_DOIT_UNLOCKED);
7178 err = ipv6_addr_label_rtnl_register();
7184 rtnl_unregister_all(PF_INET6);
7185 rtnl_af_unregister(&inet6_ops);
7186 unregister_netdevice_notifier(&ipv6_dev_notf);
7188 destroy_workqueue(addrconf_wq);
7190 unregister_pernet_subsys(&addrconf_ops);
7192 ipv6_addr_label_cleanup();
7197 void addrconf_cleanup(void)
7199 struct net_device *dev;
7202 unregister_netdevice_notifier(&ipv6_dev_notf);
7203 unregister_pernet_subsys(&addrconf_ops);
7204 ipv6_addr_label_cleanup();
7206 rtnl_af_unregister(&inet6_ops);
7210 /* clean dev list */
7211 for_each_netdev(&init_net, dev) {
7212 if (__in6_dev_get(dev) == NULL)
7214 addrconf_ifdown(dev, 1);
7216 addrconf_ifdown(init_net.loopback_dev, 2);
7221 spin_lock_bh(&addrconf_hash_lock);
7222 for (i = 0; i < IN6_ADDR_HSIZE; i++)
7223 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
7224 spin_unlock_bh(&addrconf_hash_lock);
7225 cancel_delayed_work(&addr_chk_work);
7228 destroy_workqueue(addrconf_wq);