2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
6 * Pedro Roque <roque@di.fc.ul.pt>
7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
25 * yoshfuji@USAGI : Fixed interval between DAD
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
41 #define pr_fmt(fmt) "IPv6: " fmt
43 #include <linux/errno.h>
44 #include <linux/types.h>
45 #include <linux/kernel.h>
46 #include <linux/socket.h>
47 #include <linux/sockios.h>
48 #include <linux/net.h>
49 #include <linux/inet.h>
50 #include <linux/in6.h>
51 #include <linux/netdevice.h>
52 #include <linux/if_addr.h>
53 #include <linux/if_arp.h>
54 #include <linux/if_arcnet.h>
55 #include <linux/if_infiniband.h>
56 #include <linux/route.h>
57 #include <linux/inetdevice.h>
58 #include <linux/init.h>
59 #include <linux/slab.h>
61 #include <linux/sysctl.h>
63 #include <linux/capability.h>
64 #include <linux/delay.h>
65 #include <linux/notifier.h>
66 #include <linux/string.h>
67 #include <linux/hash.h>
69 #include <net/net_namespace.h>
73 #include <net/af_ieee802154.h>
74 #include <net/firewire.h>
76 #include <net/protocol.h>
77 #include <net/ndisc.h>
78 #include <net/ip6_route.h>
79 #include <net/addrconf.h>
82 #include <net/netlink.h>
83 #include <net/pkt_sched.h>
84 #include <linux/if_tunnel.h>
85 #include <linux/rtnetlink.h>
86 #include <linux/netconf.h>
87 #include <linux/random.h>
88 #include <linux/uaccess.h>
89 #include <asm/unaligned.h>
91 #include <linux/proc_fs.h>
92 #include <linux/seq_file.h>
93 #include <linux/export.h>
95 /* Set to 3 to get tracing... */
99 #define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
101 #define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
104 #define INFINITY_LIFE_TIME 0xFFFFFFFF
106 #define IPV6_MAX_STRLEN \
107 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
109 static inline u32 cstamp_delta(unsigned long cstamp)
111 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
115 static int addrconf_sysctl_register(struct inet6_dev *idev);
116 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
118 static inline int addrconf_sysctl_register(struct inet6_dev *idev)
123 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
128 static void __ipv6_regen_rndid(struct inet6_dev *idev);
129 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
130 static void ipv6_regen_rndid(unsigned long data);
132 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
133 static int ipv6_count_addresses(struct inet6_dev *idev);
134 static int ipv6_generate_stable_address(struct in6_addr *addr,
136 const struct inet6_dev *idev);
139 * Configured unicast address hash table
141 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
142 static DEFINE_SPINLOCK(addrconf_hash_lock);
144 static void addrconf_verify(void);
145 static void addrconf_verify_rtnl(void);
146 static void addrconf_verify_work(struct work_struct *);
148 static struct workqueue_struct *addrconf_wq;
149 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
151 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
152 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
154 static void addrconf_type_change(struct net_device *dev,
155 unsigned long event);
156 static int addrconf_ifdown(struct net_device *dev, int how);
158 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
160 const struct net_device *dev,
161 u32 flags, u32 noflags);
163 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
164 static void addrconf_dad_work(struct work_struct *w);
165 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
166 static void addrconf_dad_run(struct inet6_dev *idev);
167 static void addrconf_rs_timer(unsigned long data);
168 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
169 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
171 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
172 struct prefix_info *pinfo);
173 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
174 struct net_device *dev);
176 static struct ipv6_devconf ipv6_devconf __read_mostly = {
178 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
179 .mtu6 = IPV6_MIN_MTU,
181 .accept_redirects = 1,
183 .force_mld_version = 0,
184 .mldv1_unsolicited_report_interval = 10 * HZ,
185 .mldv2_unsolicited_report_interval = HZ,
187 .rtr_solicits = MAX_RTR_SOLICITATIONS,
188 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
189 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
191 .temp_valid_lft = TEMP_VALID_LIFETIME,
192 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
193 .regen_max_retry = REGEN_MAX_RETRY,
194 .max_desync_factor = MAX_DESYNC_FACTOR,
195 .max_addresses = IPV6_MAX_ADDRESSES,
196 .accept_ra_defrtr = 1,
197 .accept_ra_from_local = 0,
198 .accept_ra_min_hop_limit= 1,
199 .accept_ra_pinfo = 1,
200 #ifdef CONFIG_IPV6_ROUTER_PREF
201 .accept_ra_rtr_pref = 1,
202 .rtr_probe_interval = 60 * HZ,
203 #ifdef CONFIG_IPV6_ROUTE_INFO
204 .accept_ra_rt_info_max_plen = 0,
208 .accept_source_route = 0, /* we do not accept RH0 by default. */
211 .suppress_frag_ndisc = 1,
214 .initialized = false,
216 .use_oif_addrs_only = 0,
217 .ignore_routes_with_linkdown = 0,
220 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
222 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
223 .mtu6 = IPV6_MIN_MTU,
225 .accept_redirects = 1,
227 .force_mld_version = 0,
228 .mldv1_unsolicited_report_interval = 10 * HZ,
229 .mldv2_unsolicited_report_interval = HZ,
231 .rtr_solicits = MAX_RTR_SOLICITATIONS,
232 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
233 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
235 .temp_valid_lft = TEMP_VALID_LIFETIME,
236 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
237 .regen_max_retry = REGEN_MAX_RETRY,
238 .max_desync_factor = MAX_DESYNC_FACTOR,
239 .max_addresses = IPV6_MAX_ADDRESSES,
240 .accept_ra_defrtr = 1,
241 .accept_ra_from_local = 0,
242 .accept_ra_min_hop_limit= 1,
243 .accept_ra_pinfo = 1,
244 #ifdef CONFIG_IPV6_ROUTER_PREF
245 .accept_ra_rtr_pref = 1,
246 .rtr_probe_interval = 60 * HZ,
247 #ifdef CONFIG_IPV6_ROUTE_INFO
248 .accept_ra_rt_info_max_plen = 0,
252 .accept_source_route = 0, /* we do not accept RH0 by default. */
255 .suppress_frag_ndisc = 1,
258 .initialized = false,
260 .use_oif_addrs_only = 0,
261 .ignore_routes_with_linkdown = 0,
264 /* Check if a valid qdisc is available */
265 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
267 return !qdisc_tx_is_noop(dev);
270 static void addrconf_del_rs_timer(struct inet6_dev *idev)
272 if (del_timer(&idev->rs_timer))
276 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
278 if (cancel_delayed_work(&ifp->dad_work))
282 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
285 if (!timer_pending(&idev->rs_timer))
287 mod_timer(&idev->rs_timer, jiffies + when);
290 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
293 if (!delayed_work_pending(&ifp->dad_work))
295 mod_delayed_work(addrconf_wq, &ifp->dad_work, delay);
298 static int snmp6_alloc_dev(struct inet6_dev *idev)
302 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
303 if (!idev->stats.ipv6)
306 for_each_possible_cpu(i) {
307 struct ipstats_mib *addrconf_stats;
308 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
309 u64_stats_init(&addrconf_stats->syncp);
313 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
315 if (!idev->stats.icmpv6dev)
317 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
319 if (!idev->stats.icmpv6msgdev)
325 kfree(idev->stats.icmpv6dev);
327 free_percpu(idev->stats.ipv6);
332 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
334 struct inet6_dev *ndev;
339 if (dev->mtu < IPV6_MIN_MTU)
340 return ERR_PTR(-EINVAL);
342 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
346 rwlock_init(&ndev->lock);
348 INIT_LIST_HEAD(&ndev->addr_list);
349 setup_timer(&ndev->rs_timer, addrconf_rs_timer,
350 (unsigned long)ndev);
351 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
352 ndev->cnf.mtu6 = dev->mtu;
353 ndev->cnf.sysctl = NULL;
354 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
355 if (!ndev->nd_parms) {
359 if (ndev->cnf.forwarding)
360 dev_disable_lro(dev);
361 /* We refer to the device */
364 if (snmp6_alloc_dev(ndev) < 0) {
366 "%s: cannot allocate memory for statistics; dev=%s.\n",
367 __func__, dev->name);
368 neigh_parms_release(&nd_tbl, ndev->nd_parms);
374 if (snmp6_register_dev(ndev) < 0) {
376 "%s: cannot create /proc/net/dev_snmp6/%s\n",
377 __func__, dev->name);
381 /* One reference from device. We must do this before
382 * we invoke __ipv6_regen_rndid().
386 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
387 ndev->cnf.accept_dad = -1;
389 #if IS_ENABLED(CONFIG_IPV6_SIT)
390 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
391 pr_info("%s: Disabled Multicast RS\n", dev->name);
392 ndev->cnf.rtr_solicits = 0;
396 INIT_LIST_HEAD(&ndev->tempaddr_list);
397 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
398 if ((dev->flags&IFF_LOOPBACK) ||
399 dev->type == ARPHRD_TUNNEL ||
400 dev->type == ARPHRD_TUNNEL6 ||
401 dev->type == ARPHRD_SIT ||
402 dev->type == ARPHRD_NONE) {
403 ndev->cnf.use_tempaddr = -1;
406 ipv6_regen_rndid((unsigned long) ndev);
409 ndev->token = in6addr_any;
411 if (netif_running(dev) && addrconf_qdisc_ok(dev))
412 ndev->if_flags |= IF_READY;
414 ipv6_mc_init_dev(ndev);
415 ndev->tstamp = jiffies;
416 err = addrconf_sysctl_register(ndev);
418 ipv6_mc_destroy_dev(ndev);
419 del_timer(&ndev->regen_timer);
422 /* protected by rtnl_lock */
423 rcu_assign_pointer(dev->ip6_ptr, ndev);
425 /* Join interface-local all-node multicast group */
426 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
428 /* Join all-node multicast group */
429 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
431 /* Join all-router multicast group if forwarding is set */
432 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
433 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
438 neigh_parms_release(&nd_tbl, ndev->nd_parms);
440 in6_dev_finish_destroy(ndev);
444 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
446 struct inet6_dev *idev;
450 idev = __in6_dev_get(dev);
452 idev = ipv6_add_dev(dev);
457 if (dev->flags&IFF_UP)
462 static int inet6_netconf_msgsize_devconf(int type)
464 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
465 + nla_total_size(4); /* NETCONFA_IFINDEX */
467 /* type -1 is used for ALL */
468 if (type == -1 || type == NETCONFA_FORWARDING)
469 size += nla_total_size(4);
470 #ifdef CONFIG_IPV6_MROUTE
471 if (type == -1 || type == NETCONFA_MC_FORWARDING)
472 size += nla_total_size(4);
474 if (type == -1 || type == NETCONFA_PROXY_NEIGH)
475 size += nla_total_size(4);
477 if (type == -1 || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
478 size += nla_total_size(4);
483 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
484 struct ipv6_devconf *devconf, u32 portid,
485 u32 seq, int event, unsigned int flags,
488 struct nlmsghdr *nlh;
489 struct netconfmsg *ncm;
491 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
496 ncm = nlmsg_data(nlh);
497 ncm->ncm_family = AF_INET6;
499 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
500 goto nla_put_failure;
502 /* type -1 is used for ALL */
503 if ((type == -1 || type == NETCONFA_FORWARDING) &&
504 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
505 goto nla_put_failure;
506 #ifdef CONFIG_IPV6_MROUTE
507 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
508 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
509 devconf->mc_forwarding) < 0)
510 goto nla_put_failure;
512 if ((type == -1 || type == NETCONFA_PROXY_NEIGH) &&
513 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
514 goto nla_put_failure;
516 if ((type == -1 || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
517 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
518 devconf->ignore_routes_with_linkdown) < 0)
519 goto nla_put_failure;
525 nlmsg_cancel(skb, nlh);
529 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
530 struct ipv6_devconf *devconf)
535 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
539 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
540 RTM_NEWNETCONF, 0, type);
542 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
543 WARN_ON(err == -EMSGSIZE);
547 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
550 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
553 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
554 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
555 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
556 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
557 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
560 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
561 struct nlmsghdr *nlh)
563 struct net *net = sock_net(in_skb->sk);
564 struct nlattr *tb[NETCONFA_MAX+1];
565 struct netconfmsg *ncm;
567 struct ipv6_devconf *devconf;
568 struct inet6_dev *in6_dev;
569 struct net_device *dev;
573 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
574 devconf_ipv6_policy);
579 if (!tb[NETCONFA_IFINDEX])
582 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
584 case NETCONFA_IFINDEX_ALL:
585 devconf = net->ipv6.devconf_all;
587 case NETCONFA_IFINDEX_DEFAULT:
588 devconf = net->ipv6.devconf_dflt;
591 dev = __dev_get_by_index(net, ifindex);
594 in6_dev = __in6_dev_get(dev);
597 devconf = &in6_dev->cnf;
602 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
606 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
607 NETLINK_CB(in_skb).portid,
608 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
611 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
612 WARN_ON(err == -EMSGSIZE);
616 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
621 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
622 struct netlink_callback *cb)
624 struct net *net = sock_net(skb->sk);
627 struct net_device *dev;
628 struct inet6_dev *idev;
629 struct hlist_head *head;
632 s_idx = idx = cb->args[1];
634 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
636 head = &net->dev_index_head[h];
638 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
640 hlist_for_each_entry_rcu(dev, head, index_hlist) {
643 idev = __in6_dev_get(dev);
647 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
649 NETLINK_CB(cb->skb).portid,
657 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
663 if (h == NETDEV_HASHENTRIES) {
664 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
665 net->ipv6.devconf_all,
666 NETLINK_CB(cb->skb).portid,
668 RTM_NEWNETCONF, NLM_F_MULTI,
674 if (h == NETDEV_HASHENTRIES + 1) {
675 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
676 net->ipv6.devconf_dflt,
677 NETLINK_CB(cb->skb).portid,
679 RTM_NEWNETCONF, NLM_F_MULTI,
693 static void dev_forward_change(struct inet6_dev *idev)
695 struct net_device *dev;
696 struct inet6_ifaddr *ifa;
701 if (idev->cnf.forwarding)
702 dev_disable_lro(dev);
703 if (dev->flags & IFF_MULTICAST) {
704 if (idev->cnf.forwarding) {
705 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
706 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
707 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
709 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
710 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
711 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
715 list_for_each_entry(ifa, &idev->addr_list, if_list) {
716 if (ifa->flags&IFA_F_TENTATIVE)
718 if (idev->cnf.forwarding)
719 addrconf_join_anycast(ifa);
721 addrconf_leave_anycast(ifa);
723 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
724 dev->ifindex, &idev->cnf);
728 static void addrconf_forward_change(struct net *net, __s32 newf)
730 struct net_device *dev;
731 struct inet6_dev *idev;
733 for_each_netdev(net, dev) {
734 idev = __in6_dev_get(dev);
736 int changed = (!idev->cnf.forwarding) ^ (!newf);
737 idev->cnf.forwarding = newf;
739 dev_forward_change(idev);
744 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
750 return restart_syscall();
752 net = (struct net *)table->extra2;
756 if (p == &net->ipv6.devconf_dflt->forwarding) {
757 if ((!newf) ^ (!old))
758 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
759 NETCONFA_IFINDEX_DEFAULT,
760 net->ipv6.devconf_dflt);
765 if (p == &net->ipv6.devconf_all->forwarding) {
766 net->ipv6.devconf_dflt->forwarding = newf;
767 addrconf_forward_change(net, newf);
768 if ((!newf) ^ (!old))
769 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
770 NETCONFA_IFINDEX_ALL,
771 net->ipv6.devconf_all);
772 } else if ((!newf) ^ (!old))
773 dev_forward_change((struct inet6_dev *)table->extra1);
777 rt6_purge_dflt_routers(net);
781 static void addrconf_linkdown_change(struct net *net, __s32 newf)
783 struct net_device *dev;
784 struct inet6_dev *idev;
786 for_each_netdev(net, dev) {
787 idev = __in6_dev_get(dev);
789 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
791 idev->cnf.ignore_routes_with_linkdown = newf;
793 inet6_netconf_notify_devconf(dev_net(dev),
794 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
801 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
807 return restart_syscall();
809 net = (struct net *)table->extra2;
813 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
814 if ((!newf) ^ (!old))
815 inet6_netconf_notify_devconf(net,
816 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
817 NETCONFA_IFINDEX_DEFAULT,
818 net->ipv6.devconf_dflt);
823 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
824 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
825 addrconf_linkdown_change(net, newf);
826 if ((!newf) ^ (!old))
827 inet6_netconf_notify_devconf(net,
828 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
829 NETCONFA_IFINDEX_ALL,
830 net->ipv6.devconf_all);
839 /* Nobody refers to this ifaddr, destroy it */
840 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
842 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
844 #ifdef NET_REFCNT_DEBUG
845 pr_debug("%s\n", __func__);
848 in6_dev_put(ifp->idev);
850 if (cancel_delayed_work(&ifp->dad_work))
851 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
854 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
855 pr_warn("Freeing alive inet6 address %p\n", ifp);
864 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
867 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
870 * Each device address list is sorted in order of scope -
871 * global before linklocal.
873 list_for_each(p, &idev->addr_list) {
874 struct inet6_ifaddr *ifa
875 = list_entry(p, struct inet6_ifaddr, if_list);
876 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
880 list_add_tail(&ifp->if_list, p);
883 static u32 inet6_addr_hash(const struct in6_addr *addr)
885 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
888 /* On success it returns ifp with increased reference count */
890 static struct inet6_ifaddr *
891 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
892 const struct in6_addr *peer_addr, int pfxlen,
893 int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
895 struct inet6_ifaddr *ifa = NULL;
899 int addr_type = ipv6_addr_type(addr);
901 if (addr_type == IPV6_ADDR_ANY ||
902 addr_type & IPV6_ADDR_MULTICAST ||
903 (!(idev->dev->flags & IFF_LOOPBACK) &&
904 addr_type & IPV6_ADDR_LOOPBACK))
905 return ERR_PTR(-EADDRNOTAVAIL);
909 err = -ENODEV; /*XXX*/
913 if (idev->cnf.disable_ipv6) {
918 spin_lock(&addrconf_hash_lock);
920 /* Ignore adding duplicate addresses on an interface */
921 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
922 ADBG("ipv6_add_addr: already assigned\n");
927 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
930 ADBG("ipv6_add_addr: malloc failed\n");
935 rt = addrconf_dst_alloc(idev, addr, false);
941 neigh_parms_data_state_setall(idev->nd_parms);
945 ifa->peer_addr = *peer_addr;
947 spin_lock_init(&ifa->lock);
948 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
949 INIT_HLIST_NODE(&ifa->addr_lst);
951 ifa->prefix_len = pfxlen;
952 ifa->flags = flags | IFA_F_TENTATIVE;
953 ifa->valid_lft = valid_lft;
954 ifa->prefered_lft = prefered_lft;
955 ifa->cstamp = ifa->tstamp = jiffies;
956 ifa->tokenized = false;
965 /* Add to big hash table */
966 hash = inet6_addr_hash(addr);
968 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
969 spin_unlock(&addrconf_hash_lock);
971 write_lock(&idev->lock);
972 /* Add to inet6_dev unicast addr list. */
973 ipv6_link_dev_addr(idev, ifa);
975 if (ifa->flags&IFA_F_TEMPORARY) {
976 list_add(&ifa->tmp_list, &idev->tempaddr_list);
981 write_unlock(&idev->lock);
983 rcu_read_unlock_bh();
985 if (likely(err == 0))
986 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
994 spin_unlock(&addrconf_hash_lock);
998 enum cleanup_prefix_rt_t {
999 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1000 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1001 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1005 * Check, whether the prefix for ifp would still need a prefix route
1006 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1009 * 1) we don't purge prefix if address was not permanent.
1010 * prefix is managed by its own lifetime.
1011 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1012 * 3) if there are no addresses, delete prefix.
1013 * 4) if there are still other permanent address(es),
1014 * corresponding prefix is still permanent.
1015 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1016 * don't purge the prefix, assume user space is managing it.
1017 * 6) otherwise, update prefix lifetime to the
1018 * longest valid lifetime among the corresponding
1019 * addresses on the device.
1020 * Note: subsequent RA will update lifetime.
1022 static enum cleanup_prefix_rt_t
1023 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1025 struct inet6_ifaddr *ifa;
1026 struct inet6_dev *idev = ifp->idev;
1027 unsigned long lifetime;
1028 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1032 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1035 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1038 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1039 return CLEANUP_PREFIX_RT_NOP;
1041 action = CLEANUP_PREFIX_RT_EXPIRE;
1043 spin_lock(&ifa->lock);
1045 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1047 * Note: Because this address is
1048 * not permanent, lifetime <
1049 * LONG_MAX / HZ here.
1051 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1052 *expires = ifa->tstamp + lifetime * HZ;
1053 spin_unlock(&ifa->lock);
1060 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
1062 struct rt6_info *rt;
1064 rt = addrconf_get_prefix_route(&ifp->addr,
1067 0, RTF_GATEWAY | RTF_DEFAULT);
1072 if (!(rt->rt6i_flags & RTF_EXPIRES))
1073 rt6_set_expires(rt, expires);
1080 /* This function wants to get referenced ifp and releases it before return */
1082 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1085 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1086 unsigned long expires;
1090 spin_lock_bh(&ifp->lock);
1092 ifp->state = INET6_IFADDR_STATE_DEAD;
1093 spin_unlock_bh(&ifp->lock);
1095 if (state == INET6_IFADDR_STATE_DEAD)
1098 spin_lock_bh(&addrconf_hash_lock);
1099 hlist_del_init_rcu(&ifp->addr_lst);
1100 spin_unlock_bh(&addrconf_hash_lock);
1102 write_lock_bh(&ifp->idev->lock);
1104 if (ifp->flags&IFA_F_TEMPORARY) {
1105 list_del(&ifp->tmp_list);
1107 in6_ifa_put(ifp->ifpub);
1113 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1114 action = check_cleanup_prefix_route(ifp, &expires);
1116 list_del_init(&ifp->if_list);
1119 write_unlock_bh(&ifp->idev->lock);
1121 addrconf_del_dad_work(ifp);
1123 ipv6_ifa_notify(RTM_DELADDR, ifp);
1125 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1127 if (action != CLEANUP_PREFIX_RT_NOP) {
1128 cleanup_prefix_route(ifp, expires,
1129 action == CLEANUP_PREFIX_RT_DEL);
1132 /* clean up prefsrc entries */
1133 rt6_remove_prefsrc(ifp);
1138 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1140 struct inet6_dev *idev = ifp->idev;
1141 struct in6_addr addr, *tmpaddr;
1142 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1143 unsigned long regen_advance;
1147 unsigned long now = jiffies;
1149 write_lock_bh(&idev->lock);
1151 spin_lock_bh(&ift->lock);
1152 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1153 spin_unlock_bh(&ift->lock);
1160 if (idev->cnf.use_tempaddr <= 0) {
1161 write_unlock_bh(&idev->lock);
1162 pr_info("%s: use_tempaddr is disabled\n", __func__);
1167 spin_lock_bh(&ifp->lock);
1168 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1169 idev->cnf.use_tempaddr = -1; /*XXX*/
1170 spin_unlock_bh(&ifp->lock);
1171 write_unlock_bh(&idev->lock);
1172 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1179 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1180 __ipv6_try_regen_rndid(idev, tmpaddr);
1181 memcpy(&addr.s6_addr[8], idev->rndid, 8);
1182 age = (now - ifp->tstamp) / HZ;
1183 tmp_valid_lft = min_t(__u32,
1185 idev->cnf.temp_valid_lft + age);
1186 tmp_prefered_lft = min_t(__u32,
1188 idev->cnf.temp_prefered_lft + age -
1189 idev->cnf.max_desync_factor);
1190 tmp_plen = ifp->prefix_len;
1191 tmp_tstamp = ifp->tstamp;
1192 spin_unlock_bh(&ifp->lock);
1194 regen_advance = idev->cnf.regen_max_retry *
1195 idev->cnf.dad_transmits *
1196 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1197 write_unlock_bh(&idev->lock);
1199 /* A temporary address is created only if this calculated Preferred
1200 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1201 * an implementation must not create a temporary address with a zero
1202 * Preferred Lifetime.
1203 * Use age calculation as in addrconf_verify to avoid unnecessary
1204 * temporary addresses being generated.
1206 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1207 if (tmp_prefered_lft <= regen_advance + age) {
1214 addr_flags = IFA_F_TEMPORARY;
1215 /* set in addrconf_prefix_rcv() */
1216 if (ifp->flags & IFA_F_OPTIMISTIC)
1217 addr_flags |= IFA_F_OPTIMISTIC;
1219 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1220 ipv6_addr_scope(&addr), addr_flags,
1221 tmp_valid_lft, tmp_prefered_lft);
1225 pr_info("%s: retry temporary address regeneration\n", __func__);
1227 write_lock_bh(&idev->lock);
1231 spin_lock_bh(&ift->lock);
1234 ift->tstamp = tmp_tstamp;
1235 spin_unlock_bh(&ift->lock);
1237 addrconf_dad_start(ift);
1245 * Choose an appropriate source address (RFC3484)
1248 IPV6_SADDR_RULE_INIT = 0,
1249 IPV6_SADDR_RULE_LOCAL,
1250 IPV6_SADDR_RULE_SCOPE,
1251 IPV6_SADDR_RULE_PREFERRED,
1252 #ifdef CONFIG_IPV6_MIP6
1253 IPV6_SADDR_RULE_HOA,
1255 IPV6_SADDR_RULE_OIF,
1256 IPV6_SADDR_RULE_LABEL,
1257 IPV6_SADDR_RULE_PRIVACY,
1258 IPV6_SADDR_RULE_ORCHID,
1259 IPV6_SADDR_RULE_PREFIX,
1260 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1261 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1266 struct ipv6_saddr_score {
1269 struct inet6_ifaddr *ifa;
1270 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1275 struct ipv6_saddr_dst {
1276 const struct in6_addr *addr;
1283 static inline int ipv6_saddr_preferred(int type)
1285 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1290 static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev)
1292 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1293 return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic;
1299 static int ipv6_get_saddr_eval(struct net *net,
1300 struct ipv6_saddr_score *score,
1301 struct ipv6_saddr_dst *dst,
1306 if (i <= score->rule) {
1308 case IPV6_SADDR_RULE_SCOPE:
1309 ret = score->scopedist;
1311 case IPV6_SADDR_RULE_PREFIX:
1312 ret = score->matchlen;
1315 ret = !!test_bit(i, score->scorebits);
1321 case IPV6_SADDR_RULE_INIT:
1322 /* Rule 0: remember if hiscore is not ready yet */
1325 case IPV6_SADDR_RULE_LOCAL:
1326 /* Rule 1: Prefer same address */
1327 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1329 case IPV6_SADDR_RULE_SCOPE:
1330 /* Rule 2: Prefer appropriate scope
1335 * ---+--+-+---> scope
1337 * | d is scope of the destination.
1339 * | \ <- smaller scope is better if
1340 * B-15 | \ if scope is enough for destination.
1341 * | ret = B - scope (-1 <= scope >= d <= 15).
1343 * |/ <- greater is better
1344 * -C / if scope is not enough for destination.
1345 * /| ret = scope - C (-1 <= d < scope <= 15).
1347 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1348 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1349 * Assume B = 0 and we get C > 29.
1351 ret = __ipv6_addr_src_scope(score->addr_type);
1352 if (ret >= dst->scope)
1355 ret -= 128; /* 30 is enough */
1356 score->scopedist = ret;
1358 case IPV6_SADDR_RULE_PREFERRED:
1360 /* Rule 3: Avoid deprecated and optimistic addresses */
1361 u8 avoid = IFA_F_DEPRECATED;
1363 if (!ipv6_use_optimistic_addr(score->ifa->idev))
1364 avoid |= IFA_F_OPTIMISTIC;
1365 ret = ipv6_saddr_preferred(score->addr_type) ||
1366 !(score->ifa->flags & avoid);
1369 #ifdef CONFIG_IPV6_MIP6
1370 case IPV6_SADDR_RULE_HOA:
1372 /* Rule 4: Prefer home address */
1373 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1374 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1378 case IPV6_SADDR_RULE_OIF:
1379 /* Rule 5: Prefer outgoing interface */
1380 ret = (!dst->ifindex ||
1381 dst->ifindex == score->ifa->idev->dev->ifindex);
1383 case IPV6_SADDR_RULE_LABEL:
1384 /* Rule 6: Prefer matching label */
1385 ret = ipv6_addr_label(net,
1386 &score->ifa->addr, score->addr_type,
1387 score->ifa->idev->dev->ifindex) == dst->label;
1389 case IPV6_SADDR_RULE_PRIVACY:
1391 /* Rule 7: Prefer public address
1392 * Note: prefer temporary address if use_tempaddr >= 2
1394 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1395 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1396 score->ifa->idev->cnf.use_tempaddr >= 2;
1397 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1400 case IPV6_SADDR_RULE_ORCHID:
1401 /* Rule 8-: Prefer ORCHID vs ORCHID or
1402 * non-ORCHID vs non-ORCHID
1404 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1405 ipv6_addr_orchid(dst->addr));
1407 case IPV6_SADDR_RULE_PREFIX:
1408 /* Rule 8: Use longest matching prefix */
1409 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1410 if (ret > score->ifa->prefix_len)
1411 ret = score->ifa->prefix_len;
1412 score->matchlen = ret;
1414 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1415 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1416 /* Optimistic addresses still have lower precedence than other
1417 * preferred addresses.
1419 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1427 __set_bit(i, score->scorebits);
1433 static int __ipv6_dev_get_saddr(struct net *net,
1434 struct ipv6_saddr_dst *dst,
1435 struct inet6_dev *idev,
1436 struct ipv6_saddr_score *scores,
1439 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1441 read_lock_bh(&idev->lock);
1442 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1446 * - Tentative Address (RFC2462 section 5.4)
1447 * - A tentative address is not considered
1448 * "assigned to an interface" in the traditional
1449 * sense, unless it is also flagged as optimistic.
1450 * - Candidate Source Address (section 4)
1451 * - In any case, anycast addresses, multicast
1452 * addresses, and the unspecified address MUST
1453 * NOT be included in a candidate set.
1455 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1456 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1459 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1461 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1462 score->addr_type & IPV6_ADDR_MULTICAST)) {
1463 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1469 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1471 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1472 int minihiscore, miniscore;
1474 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1475 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1477 if (minihiscore > miniscore) {
1478 if (i == IPV6_SADDR_RULE_SCOPE &&
1479 score->scopedist > 0) {
1482 * each remaining entry
1483 * has too small (not enough)
1484 * scope, because ifa entries
1485 * are sorted by their scope
1491 } else if (minihiscore < miniscore) {
1493 in6_ifa_put(hiscore->ifa);
1495 in6_ifa_hold(score->ifa);
1497 swap(hiscore, score);
1498 hiscore_idx = 1 - hiscore_idx;
1500 /* restore our iterator */
1501 score->ifa = hiscore->ifa;
1508 read_unlock_bh(&idev->lock);
1512 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1513 const struct in6_addr *daddr, unsigned int prefs,
1514 struct in6_addr *saddr)
1516 struct ipv6_saddr_score scores[2], *hiscore;
1517 struct ipv6_saddr_dst dst;
1518 struct inet6_dev *idev;
1519 struct net_device *dev;
1521 bool use_oif_addr = false;
1522 int hiscore_idx = 0;
1524 dst_type = __ipv6_addr_type(daddr);
1526 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1527 dst.scope = __ipv6_addr_src_scope(dst_type);
1528 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1531 scores[hiscore_idx].rule = -1;
1532 scores[hiscore_idx].ifa = NULL;
1536 /* Candidate Source Address (section 4)
1537 * - multicast and link-local destination address,
1538 * the set of candidate source address MUST only
1539 * include addresses assigned to interfaces
1540 * belonging to the same link as the outgoing
1542 * (- For site-local destination addresses, the
1543 * set of candidate source addresses MUST only
1544 * include addresses assigned to interfaces
1545 * belonging to the same site as the outgoing
1547 * - "It is RECOMMENDED that the candidate source addresses
1548 * be the set of unicast addresses assigned to the
1549 * interface that will be used to send to the destination
1550 * (the 'outgoing' interface)." (RFC 6724)
1553 idev = __in6_dev_get(dst_dev);
1554 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1555 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1556 (idev && idev->cnf.use_oif_addrs_only)) {
1557 use_oif_addr = true;
1563 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1565 for_each_netdev_rcu(net, dev) {
1566 idev = __in6_dev_get(dev);
1569 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1574 hiscore = &scores[hiscore_idx];
1576 return -EADDRNOTAVAIL;
1578 *saddr = hiscore->ifa->addr;
1579 in6_ifa_put(hiscore->ifa);
1582 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1584 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1587 struct inet6_ifaddr *ifp;
1588 int err = -EADDRNOTAVAIL;
1590 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1591 if (ifp->scope > IFA_LINK)
1593 if (ifp->scope == IFA_LINK &&
1594 !(ifp->flags & banned_flags)) {
1603 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1606 struct inet6_dev *idev;
1607 int err = -EADDRNOTAVAIL;
1610 idev = __in6_dev_get(dev);
1612 read_lock_bh(&idev->lock);
1613 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1614 read_unlock_bh(&idev->lock);
1620 static int ipv6_count_addresses(struct inet6_dev *idev)
1623 struct inet6_ifaddr *ifp;
1625 read_lock_bh(&idev->lock);
1626 list_for_each_entry(ifp, &idev->addr_list, if_list)
1628 read_unlock_bh(&idev->lock);
1632 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1633 const struct net_device *dev, int strict)
1635 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
1637 EXPORT_SYMBOL(ipv6_chk_addr);
1639 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1640 const struct net_device *dev, int strict,
1643 struct inet6_ifaddr *ifp;
1644 unsigned int hash = inet6_addr_hash(addr);
1648 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1649 if (!net_eq(dev_net(ifp->idev->dev), net))
1651 /* Decouple optimistic from tentative for evaluation here.
1652 * Ban optimistic addresses explicitly, when required.
1654 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1655 ? (ifp->flags&~IFA_F_TENTATIVE)
1657 if (ipv6_addr_equal(&ifp->addr, addr) &&
1658 !(ifp_flags&banned_flags) &&
1659 (!dev || ifp->idev->dev == dev ||
1660 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1661 rcu_read_unlock_bh();
1666 rcu_read_unlock_bh();
1669 EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1671 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1672 struct net_device *dev)
1674 unsigned int hash = inet6_addr_hash(addr);
1675 struct inet6_ifaddr *ifp;
1677 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1678 if (!net_eq(dev_net(ifp->idev->dev), net))
1680 if (ipv6_addr_equal(&ifp->addr, addr)) {
1681 if (!dev || ifp->idev->dev == dev)
1688 /* Compares an address/prefix_len with addresses on device @dev.
1689 * If one is found it returns true.
1691 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1692 const unsigned int prefix_len, struct net_device *dev)
1694 struct inet6_dev *idev;
1695 struct inet6_ifaddr *ifa;
1699 idev = __in6_dev_get(dev);
1701 read_lock_bh(&idev->lock);
1702 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1703 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1707 read_unlock_bh(&idev->lock);
1713 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1715 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1717 struct inet6_dev *idev;
1718 struct inet6_ifaddr *ifa;
1723 idev = __in6_dev_get(dev);
1725 read_lock_bh(&idev->lock);
1726 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1727 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1732 read_unlock_bh(&idev->lock);
1737 EXPORT_SYMBOL(ipv6_chk_prefix);
1739 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1740 struct net_device *dev, int strict)
1742 struct inet6_ifaddr *ifp, *result = NULL;
1743 unsigned int hash = inet6_addr_hash(addr);
1746 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1747 if (!net_eq(dev_net(ifp->idev->dev), net))
1749 if (ipv6_addr_equal(&ifp->addr, addr)) {
1750 if (!dev || ifp->idev->dev == dev ||
1751 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1758 rcu_read_unlock_bh();
1763 /* Gets referenced address, destroys ifaddr */
1765 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1767 if (ifp->flags&IFA_F_PERMANENT) {
1768 spin_lock_bh(&ifp->lock);
1769 addrconf_del_dad_work(ifp);
1770 ifp->flags |= IFA_F_TENTATIVE;
1772 ifp->flags |= IFA_F_DADFAILED;
1773 spin_unlock_bh(&ifp->lock);
1775 ipv6_ifa_notify(0, ifp);
1777 } else if (ifp->flags&IFA_F_TEMPORARY) {
1778 struct inet6_ifaddr *ifpub;
1779 spin_lock_bh(&ifp->lock);
1782 in6_ifa_hold(ifpub);
1783 spin_unlock_bh(&ifp->lock);
1784 ipv6_create_tempaddr(ifpub, ifp);
1787 spin_unlock_bh(&ifp->lock);
1795 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1799 spin_lock_bh(&ifp->lock);
1800 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1801 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1804 spin_unlock_bh(&ifp->lock);
1809 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1811 struct in6_addr addr;
1812 struct inet6_dev *idev = ifp->idev;
1813 struct net *net = dev_net(ifp->idev->dev);
1815 if (addrconf_dad_end(ifp)) {
1820 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1821 ifp->idev->dev->name, &ifp->addr);
1823 spin_lock_bh(&ifp->lock);
1825 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
1826 int scope = ifp->scope;
1827 u32 flags = ifp->flags;
1828 struct in6_addr new_addr;
1829 struct inet6_ifaddr *ifp2;
1830 u32 valid_lft, preferred_lft;
1831 int pfxlen = ifp->prefix_len;
1832 int retries = ifp->stable_privacy_retry + 1;
1834 if (retries > net->ipv6.sysctl.idgen_retries) {
1835 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
1836 ifp->idev->dev->name);
1840 new_addr = ifp->addr;
1841 if (ipv6_generate_stable_address(&new_addr, retries,
1845 valid_lft = ifp->valid_lft;
1846 preferred_lft = ifp->prefered_lft;
1848 spin_unlock_bh(&ifp->lock);
1850 if (idev->cnf.max_addresses &&
1851 ipv6_count_addresses(idev) >=
1852 idev->cnf.max_addresses)
1855 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
1856 ifp->idev->dev->name);
1858 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
1859 scope, flags, valid_lft,
1864 spin_lock_bh(&ifp2->lock);
1865 ifp2->stable_privacy_retry = retries;
1866 ifp2->state = INET6_IFADDR_STATE_PREDAD;
1867 spin_unlock_bh(&ifp2->lock);
1869 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
1872 spin_lock_bh(&ifp->lock);
1873 } else if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1874 addr.s6_addr32[0] = htonl(0xfe800000);
1875 addr.s6_addr32[1] = 0;
1877 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1878 ipv6_addr_equal(&ifp->addr, &addr)) {
1879 /* DAD failed for link-local based on MAC address */
1880 idev->cnf.disable_ipv6 = 1;
1882 pr_info("%s: IPv6 being disabled!\n",
1883 ifp->idev->dev->name);
1888 /* transition from _POSTDAD to _ERRDAD */
1889 ifp->state = INET6_IFADDR_STATE_ERRDAD;
1890 spin_unlock_bh(&ifp->lock);
1892 addrconf_mod_dad_work(ifp, 0);
1895 /* Join to solicited addr multicast group.
1896 * caller must hold RTNL */
1897 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1899 struct in6_addr maddr;
1901 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1904 addrconf_addr_solict_mult(addr, &maddr);
1905 ipv6_dev_mc_inc(dev, &maddr);
1908 /* caller must hold RTNL */
1909 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1911 struct in6_addr maddr;
1913 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1916 addrconf_addr_solict_mult(addr, &maddr);
1917 __ipv6_dev_mc_dec(idev, &maddr);
1920 /* caller must hold RTNL */
1921 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1923 struct in6_addr addr;
1925 if (ifp->prefix_len >= 127) /* RFC 6164 */
1927 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1928 if (ipv6_addr_any(&addr))
1930 __ipv6_dev_ac_inc(ifp->idev, &addr);
1933 /* caller must hold RTNL */
1934 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1936 struct in6_addr addr;
1938 if (ifp->prefix_len >= 127) /* RFC 6164 */
1940 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1941 if (ipv6_addr_any(&addr))
1943 __ipv6_dev_ac_dec(ifp->idev, &addr);
1946 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1948 if (dev->addr_len != IEEE802154_ADDR_LEN)
1950 memcpy(eui, dev->dev_addr, 8);
1955 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1957 union fwnet_hwaddr *ha;
1959 if (dev->addr_len != FWNET_ALEN)
1962 ha = (union fwnet_hwaddr *)dev->dev_addr;
1964 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1969 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1971 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1972 if (dev->addr_len != ARCNET_ALEN)
1975 eui[7] = *(u8 *)dev->dev_addr;
1979 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1981 if (dev->addr_len != INFINIBAND_ALEN)
1983 memcpy(eui, dev->dev_addr + 12, 8);
1988 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1992 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1993 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1994 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1995 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1996 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1997 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2001 memcpy(eui + 4, &addr, 4);
2005 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2007 if (dev->priv_flags & IFF_ISATAP)
2008 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2012 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2014 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2017 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2019 memcpy(eui, dev->perm_addr, 3);
2020 memcpy(eui + 5, dev->perm_addr + 3, 3);
2027 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2029 switch (dev->type) {
2032 return addrconf_ifid_eui48(eui, dev);
2034 return addrconf_ifid_arcnet(eui, dev);
2035 case ARPHRD_INFINIBAND:
2036 return addrconf_ifid_infiniband(eui, dev);
2038 return addrconf_ifid_sit(eui, dev);
2040 return addrconf_ifid_gre(eui, dev);
2041 case ARPHRD_6LOWPAN:
2042 case ARPHRD_IEEE802154:
2043 return addrconf_ifid_eui64(eui, dev);
2044 case ARPHRD_IEEE1394:
2045 return addrconf_ifid_ieee1394(eui, dev);
2046 case ARPHRD_TUNNEL6:
2047 return addrconf_ifid_ip6tnl(eui, dev);
2052 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2055 struct inet6_ifaddr *ifp;
2057 read_lock_bh(&idev->lock);
2058 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2059 if (ifp->scope > IFA_LINK)
2061 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2062 memcpy(eui, ifp->addr.s6_addr+8, 8);
2067 read_unlock_bh(&idev->lock);
2071 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
2072 static void __ipv6_regen_rndid(struct inet6_dev *idev)
2075 get_random_bytes(idev->rndid, sizeof(idev->rndid));
2076 idev->rndid[0] &= ~0x02;
2079 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2080 * check if generated address is not inappropriate
2082 * - Reserved subnet anycast (RFC 2526)
2083 * 11111101 11....11 1xxxxxxx
2084 * - ISATAP (RFC4214) 6.1
2085 * 00-00-5E-FE-xx-xx-xx-xx
2087 * - XXX: already assigned to an address on the device
2089 if (idev->rndid[0] == 0xfd &&
2090 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2091 (idev->rndid[7]&0x80))
2093 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2094 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2096 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2101 static void ipv6_regen_rndid(unsigned long data)
2103 struct inet6_dev *idev = (struct inet6_dev *) data;
2104 unsigned long expires;
2107 write_lock_bh(&idev->lock);
2112 __ipv6_regen_rndid(idev);
2115 idev->cnf.temp_prefered_lft * HZ -
2116 idev->cnf.regen_max_retry * idev->cnf.dad_transmits *
2117 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) -
2118 idev->cnf.max_desync_factor * HZ;
2119 if (time_before(expires, jiffies)) {
2120 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
2121 __func__, idev->dev->name);
2125 if (!mod_timer(&idev->regen_timer, expires))
2129 write_unlock_bh(&idev->lock);
2130 rcu_read_unlock_bh();
2134 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
2136 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
2137 __ipv6_regen_rndid(idev);
2145 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
2146 unsigned long expires, u32 flags)
2148 struct fib6_config cfg = {
2149 .fc_table = RT6_TABLE_PREFIX,
2150 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2151 .fc_ifindex = dev->ifindex,
2152 .fc_expires = expires,
2154 .fc_flags = RTF_UP | flags,
2155 .fc_nlinfo.nl_net = dev_net(dev),
2156 .fc_protocol = RTPROT_KERNEL,
2161 /* Prevent useless cloning on PtP SIT.
2162 This thing is done here expecting that the whole
2163 class of non-broadcast devices need not cloning.
2165 #if IS_ENABLED(CONFIG_IPV6_SIT)
2166 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2167 cfg.fc_flags |= RTF_NONEXTHOP;
2170 ip6_route_add(&cfg);
2174 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2176 const struct net_device *dev,
2177 u32 flags, u32 noflags)
2179 struct fib6_node *fn;
2180 struct rt6_info *rt = NULL;
2181 struct fib6_table *table;
2183 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
2187 read_lock_bh(&table->tb6_lock);
2188 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2192 noflags |= RTF_CACHE;
2193 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2194 if (rt->dst.dev->ifindex != dev->ifindex)
2196 if ((rt->rt6i_flags & flags) != flags)
2198 if ((rt->rt6i_flags & noflags) != 0)
2204 read_unlock_bh(&table->tb6_lock);
2209 /* Create "default" multicast route to the interface */
2211 static void addrconf_add_mroute(struct net_device *dev)
2213 struct fib6_config cfg = {
2214 .fc_table = RT6_TABLE_LOCAL,
2215 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2216 .fc_ifindex = dev->ifindex,
2219 .fc_nlinfo.nl_net = dev_net(dev),
2222 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2224 ip6_route_add(&cfg);
2227 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2229 struct inet6_dev *idev;
2233 idev = ipv6_find_idev(dev);
2235 return ERR_PTR(-ENOBUFS);
2237 if (idev->cnf.disable_ipv6)
2238 return ERR_PTR(-EACCES);
2240 /* Add default multicast route */
2241 if (!(dev->flags & IFF_LOOPBACK))
2242 addrconf_add_mroute(dev);
2247 static void manage_tempaddrs(struct inet6_dev *idev,
2248 struct inet6_ifaddr *ifp,
2249 __u32 valid_lft, __u32 prefered_lft,
2250 bool create, unsigned long now)
2253 struct inet6_ifaddr *ift;
2255 read_lock_bh(&idev->lock);
2256 /* update all temporary addresses in the list */
2257 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2258 int age, max_valid, max_prefered;
2260 if (ifp != ift->ifpub)
2263 /* RFC 4941 section 3.3:
2264 * If a received option will extend the lifetime of a public
2265 * address, the lifetimes of temporary addresses should
2266 * be extended, subject to the overall constraint that no
2267 * temporary addresses should ever remain "valid" or "preferred"
2268 * for a time longer than (TEMP_VALID_LIFETIME) or
2269 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2271 age = (now - ift->cstamp) / HZ;
2272 max_valid = idev->cnf.temp_valid_lft - age;
2276 max_prefered = idev->cnf.temp_prefered_lft -
2277 idev->cnf.max_desync_factor - age;
2278 if (max_prefered < 0)
2281 if (valid_lft > max_valid)
2282 valid_lft = max_valid;
2284 if (prefered_lft > max_prefered)
2285 prefered_lft = max_prefered;
2287 spin_lock(&ift->lock);
2289 ift->valid_lft = valid_lft;
2290 ift->prefered_lft = prefered_lft;
2292 if (prefered_lft > 0)
2293 ift->flags &= ~IFA_F_DEPRECATED;
2295 spin_unlock(&ift->lock);
2296 if (!(flags&IFA_F_TENTATIVE))
2297 ipv6_ifa_notify(0, ift);
2300 if ((create || list_empty(&idev->tempaddr_list)) &&
2301 idev->cnf.use_tempaddr > 0) {
2302 /* When a new public address is created as described
2303 * in [ADDRCONF], also create a new temporary address.
2304 * Also create a temporary address if it's enabled but
2305 * no temporary address currently exists.
2307 read_unlock_bh(&idev->lock);
2308 ipv6_create_tempaddr(ifp, NULL);
2310 read_unlock_bh(&idev->lock);
2314 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2316 struct prefix_info *pinfo;
2321 struct inet6_dev *in6_dev;
2322 struct net *net = dev_net(dev);
2324 pinfo = (struct prefix_info *) opt;
2326 if (len < sizeof(struct prefix_info)) {
2327 ADBG("addrconf: prefix option too short\n");
2332 * Validation checks ([ADDRCONF], page 19)
2335 addr_type = ipv6_addr_type(&pinfo->prefix);
2337 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2340 valid_lft = ntohl(pinfo->valid);
2341 prefered_lft = ntohl(pinfo->prefered);
2343 if (prefered_lft > valid_lft) {
2344 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2348 in6_dev = in6_dev_get(dev);
2351 net_dbg_ratelimited("addrconf: device %s not configured\n",
2357 * Two things going on here:
2358 * 1) Add routes for on-link prefixes
2359 * 2) Configure prefixes with the auto flag set
2362 if (pinfo->onlink) {
2363 struct rt6_info *rt;
2364 unsigned long rt_expires;
2366 /* Avoid arithmetic overflow. Really, we could
2367 * save rt_expires in seconds, likely valid_lft,
2368 * but it would require division in fib gc, that it
2372 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2374 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2376 if (addrconf_finite_timeout(rt_expires))
2379 rt = addrconf_get_prefix_route(&pinfo->prefix,
2382 RTF_ADDRCONF | RTF_PREFIX_RT,
2383 RTF_GATEWAY | RTF_DEFAULT);
2386 /* Autoconf prefix route */
2387 if (valid_lft == 0) {
2390 } else if (addrconf_finite_timeout(rt_expires)) {
2392 rt6_set_expires(rt, jiffies + rt_expires);
2394 rt6_clean_expires(rt);
2396 } else if (valid_lft) {
2397 clock_t expires = 0;
2398 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2399 if (addrconf_finite_timeout(rt_expires)) {
2401 flags |= RTF_EXPIRES;
2402 expires = jiffies_to_clock_t(rt_expires);
2404 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2405 dev, expires, flags);
2410 /* Try to figure out our local address for this prefix */
2412 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2413 struct inet6_ifaddr *ifp;
2414 struct in6_addr addr;
2415 int create = 0, update_lft = 0;
2416 bool tokenized = false;
2418 if (pinfo->prefix_len == 64) {
2419 memcpy(&addr, &pinfo->prefix, 8);
2421 if (!ipv6_addr_any(&in6_dev->token)) {
2422 read_lock_bh(&in6_dev->lock);
2423 memcpy(addr.s6_addr + 8,
2424 in6_dev->token.s6_addr + 8, 8);
2425 read_unlock_bh(&in6_dev->lock);
2427 } else if (in6_dev->addr_gen_mode ==
2428 IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
2429 !ipv6_generate_stable_address(&addr, 0,
2431 addr_flags |= IFA_F_STABLE_PRIVACY;
2433 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2434 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2435 in6_dev_put(in6_dev);
2440 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2442 in6_dev_put(in6_dev);
2447 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
2449 if (!ifp && valid_lft) {
2450 int max_addresses = in6_dev->cnf.max_addresses;
2452 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2453 if (in6_dev->cnf.optimistic_dad &&
2454 !net->ipv6.devconf_all->forwarding && sllao)
2455 addr_flags = IFA_F_OPTIMISTIC;
2458 /* Do not allow to create too much of autoconfigured
2459 * addresses; this would be too easy way to crash kernel.
2461 if (!max_addresses ||
2462 ipv6_count_addresses(in6_dev) < max_addresses)
2463 ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2465 addr_type&IPV6_ADDR_SCOPE_MASK,
2466 addr_flags, valid_lft,
2469 if (IS_ERR_OR_NULL(ifp)) {
2470 in6_dev_put(in6_dev);
2476 spin_lock_bh(&ifp->lock);
2477 ifp->flags |= IFA_F_MANAGETEMPADDR;
2478 ifp->cstamp = jiffies;
2479 ifp->tokenized = tokenized;
2480 spin_unlock_bh(&ifp->lock);
2481 addrconf_dad_start(ifp);
2489 /* update lifetime (RFC2462 5.5.3 e) */
2490 spin_lock_bh(&ifp->lock);
2492 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2493 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2496 if (!update_lft && !create && stored_lft) {
2497 const u32 minimum_lft = min_t(u32,
2498 stored_lft, MIN_VALID_LIFETIME);
2499 valid_lft = max(valid_lft, minimum_lft);
2501 /* RFC4862 Section 5.5.3e:
2502 * "Note that the preferred lifetime of the
2503 * corresponding address is always reset to
2504 * the Preferred Lifetime in the received
2505 * Prefix Information option, regardless of
2506 * whether the valid lifetime is also reset or
2509 * So we should always update prefered_lft here.
2515 ifp->valid_lft = valid_lft;
2516 ifp->prefered_lft = prefered_lft;
2519 ifp->flags &= ~IFA_F_DEPRECATED;
2520 spin_unlock_bh(&ifp->lock);
2522 if (!(flags&IFA_F_TENTATIVE))
2523 ipv6_ifa_notify(0, ifp);
2525 spin_unlock_bh(&ifp->lock);
2527 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2534 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2535 in6_dev_put(in6_dev);
2539 * Set destination address.
2540 * Special case for SIT interfaces where we create a new "virtual"
2543 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2545 struct in6_ifreq ireq;
2546 struct net_device *dev;
2552 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2555 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2561 #if IS_ENABLED(CONFIG_IPV6_SIT)
2562 if (dev->type == ARPHRD_SIT) {
2563 const struct net_device_ops *ops = dev->netdev_ops;
2565 struct ip_tunnel_parm p;
2567 err = -EADDRNOTAVAIL;
2568 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2571 memset(&p, 0, sizeof(p));
2572 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2576 p.iph.protocol = IPPROTO_IPV6;
2578 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2580 if (ops->ndo_do_ioctl) {
2581 mm_segment_t oldfs = get_fs();
2584 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2591 dev = __dev_get_by_name(net, p.name);
2594 err = dev_open(dev);
2604 static int ipv6_mc_config(struct sock *sk, bool join,
2605 const struct in6_addr *addr, int ifindex)
2613 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2615 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2622 * Manual configuration of address on an interface
2624 static int inet6_addr_add(struct net *net, int ifindex,
2625 const struct in6_addr *pfx,
2626 const struct in6_addr *peer_pfx,
2627 unsigned int plen, __u32 ifa_flags,
2628 __u32 prefered_lft, __u32 valid_lft)
2630 struct inet6_ifaddr *ifp;
2631 struct inet6_dev *idev;
2632 struct net_device *dev;
2633 unsigned long timeout;
2643 /* check the lifetime */
2644 if (!valid_lft || prefered_lft > valid_lft)
2647 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2650 dev = __dev_get_by_index(net, ifindex);
2654 idev = addrconf_add_dev(dev);
2656 return PTR_ERR(idev);
2658 if (ifa_flags & IFA_F_MCAUTOJOIN) {
2659 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2660 true, pfx, ifindex);
2666 scope = ipv6_addr_scope(pfx);
2668 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2669 if (addrconf_finite_timeout(timeout)) {
2670 expires = jiffies_to_clock_t(timeout * HZ);
2671 valid_lft = timeout;
2672 flags = RTF_EXPIRES;
2676 ifa_flags |= IFA_F_PERMANENT;
2679 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2680 if (addrconf_finite_timeout(timeout)) {
2682 ifa_flags |= IFA_F_DEPRECATED;
2683 prefered_lft = timeout;
2686 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2687 valid_lft, prefered_lft);
2690 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2691 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2696 * Note that section 3.1 of RFC 4429 indicates
2697 * that the Optimistic flag should not be set for
2698 * manually configured addresses
2700 addrconf_dad_start(ifp);
2701 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2702 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2705 addrconf_verify_rtnl();
2707 } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2708 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2709 false, pfx, ifindex);
2712 return PTR_ERR(ifp);
2715 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2716 const struct in6_addr *pfx, unsigned int plen)
2718 struct inet6_ifaddr *ifp;
2719 struct inet6_dev *idev;
2720 struct net_device *dev;
2725 dev = __dev_get_by_index(net, ifindex);
2729 idev = __in6_dev_get(dev);
2733 read_lock_bh(&idev->lock);
2734 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2735 if (ifp->prefix_len == plen &&
2736 ipv6_addr_equal(pfx, &ifp->addr)) {
2738 read_unlock_bh(&idev->lock);
2740 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2741 (ifa_flags & IFA_F_MANAGETEMPADDR))
2742 manage_tempaddrs(idev, ifp, 0, 0, false,
2745 addrconf_verify_rtnl();
2746 if (ipv6_addr_is_multicast(pfx)) {
2747 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2748 false, pfx, dev->ifindex);
2753 read_unlock_bh(&idev->lock);
2754 return -EADDRNOTAVAIL;
2758 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2760 struct in6_ifreq ireq;
2763 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2766 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2770 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2771 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2772 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2777 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2779 struct in6_ifreq ireq;
2782 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2785 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2789 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
2790 ireq.ifr6_prefixlen);
2795 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2796 int plen, int scope)
2798 struct inet6_ifaddr *ifp;
2800 ifp = ipv6_add_addr(idev, addr, NULL, plen,
2801 scope, IFA_F_PERMANENT,
2802 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2804 spin_lock_bh(&ifp->lock);
2805 ifp->flags &= ~IFA_F_TENTATIVE;
2806 spin_unlock_bh(&ifp->lock);
2807 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2812 #if IS_ENABLED(CONFIG_IPV6_SIT)
2813 static void sit_add_v4_addrs(struct inet6_dev *idev)
2815 struct in6_addr addr;
2816 struct net_device *dev;
2817 struct net *net = dev_net(idev->dev);
2823 memset(&addr, 0, sizeof(struct in6_addr));
2824 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2826 if (idev->dev->flags&IFF_POINTOPOINT) {
2827 addr.s6_addr32[0] = htonl(0xfe800000);
2831 scope = IPV6_ADDR_COMPATv4;
2833 pflags |= RTF_NONEXTHOP;
2836 if (addr.s6_addr32[3]) {
2837 add_addr(idev, &addr, plen, scope);
2838 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
2842 for_each_netdev(net, dev) {
2843 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2844 if (in_dev && (dev->flags & IFF_UP)) {
2845 struct in_ifaddr *ifa;
2849 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2851 addr.s6_addr32[3] = ifa->ifa_local;
2853 if (ifa->ifa_scope == RT_SCOPE_LINK)
2855 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2856 if (idev->dev->flags&IFF_POINTOPOINT)
2861 add_addr(idev, &addr, plen, flag);
2862 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2870 static void init_loopback(struct net_device *dev)
2872 struct inet6_dev *idev;
2873 struct net_device *sp_dev;
2874 struct inet6_ifaddr *sp_ifa;
2875 struct rt6_info *sp_rt;
2881 idev = ipv6_find_idev(dev);
2883 pr_debug("%s: add_dev failed\n", __func__);
2887 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2889 /* Add routes to other interface's IPv6 addresses */
2890 for_each_netdev(dev_net(dev), sp_dev) {
2891 if (!strcmp(sp_dev->name, dev->name))
2894 idev = __in6_dev_get(sp_dev);
2898 read_lock_bh(&idev->lock);
2899 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2901 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2905 /* This dst has been added to garbage list when
2906 * lo device down, release this obsolete dst and
2907 * reallocate a new router for ifa.
2909 if (sp_ifa->rt->dst.obsolete > 0) {
2910 ip6_rt_put(sp_ifa->rt);
2917 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
2919 /* Failure cases are ignored */
2920 if (!IS_ERR(sp_rt)) {
2925 read_unlock_bh(&idev->lock);
2929 static void addrconf_add_linklocal(struct inet6_dev *idev,
2930 const struct in6_addr *addr, u32 flags)
2932 struct inet6_ifaddr *ifp;
2933 u32 addr_flags = flags | IFA_F_PERMANENT;
2935 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2936 if (idev->cnf.optimistic_dad &&
2937 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2938 addr_flags |= IFA_F_OPTIMISTIC;
2941 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
2942 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2944 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2945 addrconf_dad_start(ifp);
2950 static bool ipv6_reserved_interfaceid(struct in6_addr address)
2952 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
2955 if (address.s6_addr32[2] == htonl(0x02005eff) &&
2956 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
2959 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
2960 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
2966 static int ipv6_generate_stable_address(struct in6_addr *address,
2968 const struct inet6_dev *idev)
2970 static DEFINE_SPINLOCK(lock);
2971 static __u32 digest[SHA_DIGEST_WORDS];
2972 static __u32 workspace[SHA_WORKSPACE_WORDS];
2975 char __data[SHA_MESSAGE_BYTES];
2977 struct in6_addr secret;
2979 unsigned char hwaddr[MAX_ADDR_LEN];
2984 struct in6_addr secret;
2985 struct in6_addr temp;
2986 struct net *net = dev_net(idev->dev);
2988 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
2990 if (idev->cnf.stable_secret.initialized)
2991 secret = idev->cnf.stable_secret.secret;
2992 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
2993 secret = net->ipv6.devconf_dflt->stable_secret.secret;
2998 spin_lock_bh(&lock);
3001 memset(&data, 0, sizeof(data));
3002 memset(workspace, 0, sizeof(workspace));
3003 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3004 data.prefix[0] = address->s6_addr32[0];
3005 data.prefix[1] = address->s6_addr32[1];
3006 data.secret = secret;
3007 data.dad_count = dad_count;
3009 sha_transform(digest, data.__data, workspace);
3012 temp.s6_addr32[2] = (__force __be32)digest[0];
3013 temp.s6_addr32[3] = (__force __be32)digest[1];
3015 spin_unlock_bh(&lock);
3017 if (ipv6_reserved_interfaceid(temp)) {
3019 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3028 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3030 struct in6_addr addr;
3032 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3034 if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY) {
3035 if (!ipv6_generate_stable_address(&addr, 0, idev))
3036 addrconf_add_linklocal(idev, &addr,
3037 IFA_F_STABLE_PRIVACY);
3038 else if (prefix_route)
3039 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3040 } else if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) {
3041 /* addrconf_add_linklocal also adds a prefix_route and we
3042 * only need to care about prefix routes if ipv6_generate_eui64
3043 * couldn't generate one.
3045 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3046 addrconf_add_linklocal(idev, &addr, 0);
3047 else if (prefix_route)
3048 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3052 static void addrconf_dev_config(struct net_device *dev)
3054 struct inet6_dev *idev;
3058 if ((dev->type != ARPHRD_ETHER) &&
3059 (dev->type != ARPHRD_FDDI) &&
3060 (dev->type != ARPHRD_ARCNET) &&
3061 (dev->type != ARPHRD_INFINIBAND) &&
3062 (dev->type != ARPHRD_IEEE802154) &&
3063 (dev->type != ARPHRD_IEEE1394) &&
3064 (dev->type != ARPHRD_TUNNEL6) &&
3065 (dev->type != ARPHRD_6LOWPAN)) {
3066 /* Alas, we support only Ethernet autoconfiguration. */
3070 idev = addrconf_add_dev(dev);
3074 addrconf_addr_gen(idev, false);
3077 #if IS_ENABLED(CONFIG_IPV6_SIT)
3078 static void addrconf_sit_config(struct net_device *dev)
3080 struct inet6_dev *idev;
3085 * Configure the tunnel with one of our IPv4
3086 * addresses... we should configure all of
3087 * our v4 addrs in the tunnel
3090 idev = ipv6_find_idev(dev);
3092 pr_debug("%s: add_dev failed\n", __func__);
3096 if (dev->priv_flags & IFF_ISATAP) {
3097 addrconf_addr_gen(idev, false);
3101 sit_add_v4_addrs(idev);
3103 if (dev->flags&IFF_POINTOPOINT)
3104 addrconf_add_mroute(dev);
3108 #if IS_ENABLED(CONFIG_NET_IPGRE)
3109 static void addrconf_gre_config(struct net_device *dev)
3111 struct inet6_dev *idev;
3115 idev = ipv6_find_idev(dev);
3117 pr_debug("%s: add_dev failed\n", __func__);
3121 addrconf_addr_gen(idev, true);
3122 if (dev->flags & IFF_POINTOPOINT)
3123 addrconf_add_mroute(dev);
3127 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3130 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3131 struct inet6_dev *idev = __in6_dev_get(dev);
3132 int run_pending = 0;
3136 case NETDEV_REGISTER:
3137 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3138 idev = ipv6_add_dev(dev);
3140 return notifier_from_errno(PTR_ERR(idev));
3146 if (dev->flags & IFF_SLAVE)
3149 if (idev && idev->cnf.disable_ipv6)
3152 if (event == NETDEV_UP) {
3153 if (!addrconf_qdisc_ok(dev)) {
3154 /* device is not ready yet. */
3155 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3160 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3161 idev = ipv6_add_dev(dev);
3163 if (!IS_ERR_OR_NULL(idev)) {
3164 idev->if_flags |= IF_READY;
3168 if (!addrconf_qdisc_ok(dev)) {
3169 /* device is still not ready. */
3174 if (idev->if_flags & IF_READY)
3175 /* device is already configured. */
3177 idev->if_flags |= IF_READY;
3180 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3186 switch (dev->type) {
3187 #if IS_ENABLED(CONFIG_IPV6_SIT)
3189 addrconf_sit_config(dev);
3192 #if IS_ENABLED(CONFIG_NET_IPGRE)
3194 addrconf_gre_config(dev);
3197 case ARPHRD_LOOPBACK:
3202 addrconf_dev_config(dev);
3206 if (!IS_ERR_OR_NULL(idev)) {
3208 addrconf_dad_run(idev);
3211 * If the MTU changed during the interface down,
3212 * when the interface up, the changed MTU must be
3213 * reflected in the idev as well as routers.
3215 if (idev->cnf.mtu6 != dev->mtu &&
3216 dev->mtu >= IPV6_MIN_MTU) {
3217 rt6_mtu_change(dev, dev->mtu);
3218 idev->cnf.mtu6 = dev->mtu;
3220 idev->tstamp = jiffies;
3221 inet6_ifinfo_notify(RTM_NEWLINK, idev);
3224 * If the changed mtu during down is lower than
3225 * IPV6_MIN_MTU stop IPv6 on this interface.
3227 if (dev->mtu < IPV6_MIN_MTU)
3228 addrconf_ifdown(dev, 1);
3232 case NETDEV_CHANGEMTU:
3233 if (idev && dev->mtu >= IPV6_MIN_MTU) {
3234 rt6_mtu_change(dev, dev->mtu);
3235 idev->cnf.mtu6 = dev->mtu;
3239 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3240 idev = ipv6_add_dev(dev);
3246 * if MTU under IPV6_MIN_MTU.
3247 * Stop IPv6 on this interface.
3251 case NETDEV_UNREGISTER:
3253 * Remove all addresses from this interface.
3255 addrconf_ifdown(dev, event != NETDEV_DOWN);
3258 case NETDEV_CHANGENAME:
3260 snmp6_unregister_dev(idev);
3261 addrconf_sysctl_unregister(idev);
3262 err = addrconf_sysctl_register(idev);
3264 return notifier_from_errno(err);
3265 err = snmp6_register_dev(idev);
3267 addrconf_sysctl_unregister(idev);
3268 return notifier_from_errno(err);
3273 case NETDEV_PRE_TYPE_CHANGE:
3274 case NETDEV_POST_TYPE_CHANGE:
3275 addrconf_type_change(dev, event);
3283 * addrconf module should be notified of a device going up
3285 static struct notifier_block ipv6_dev_notf = {
3286 .notifier_call = addrconf_notify,
3289 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3291 struct inet6_dev *idev;
3294 idev = __in6_dev_get(dev);
3296 if (event == NETDEV_POST_TYPE_CHANGE)
3297 ipv6_mc_remap(idev);
3298 else if (event == NETDEV_PRE_TYPE_CHANGE)
3299 ipv6_mc_unmap(idev);
3302 static int addrconf_ifdown(struct net_device *dev, int how)
3304 struct net *net = dev_net(dev);
3305 struct inet6_dev *idev;
3306 struct inet6_ifaddr *ifa;
3311 rt6_ifdown(net, dev);
3312 neigh_ifdown(&nd_tbl, dev);
3314 idev = __in6_dev_get(dev);
3319 * Step 1: remove reference to ipv6 device from parent device.
3325 /* protected by rtnl_lock */
3326 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3328 /* Step 1.5: remove snmp6 entry */
3329 snmp6_unregister_dev(idev);
3333 /* Step 2: clear hash table */
3334 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3335 struct hlist_head *h = &inet6_addr_lst[i];
3337 spin_lock_bh(&addrconf_hash_lock);
3339 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3340 if (ifa->idev == idev) {
3341 hlist_del_init_rcu(&ifa->addr_lst);
3342 addrconf_del_dad_work(ifa);
3346 spin_unlock_bh(&addrconf_hash_lock);
3349 write_lock_bh(&idev->lock);
3351 addrconf_del_rs_timer(idev);
3353 /* Step 2: clear flags for stateless addrconf */
3355 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3357 if (how && del_timer(&idev->regen_timer))
3360 /* Step 3: clear tempaddr list */
3361 while (!list_empty(&idev->tempaddr_list)) {
3362 ifa = list_first_entry(&idev->tempaddr_list,
3363 struct inet6_ifaddr, tmp_list);
3364 list_del(&ifa->tmp_list);
3365 write_unlock_bh(&idev->lock);
3366 spin_lock_bh(&ifa->lock);
3369 in6_ifa_put(ifa->ifpub);
3372 spin_unlock_bh(&ifa->lock);
3374 write_lock_bh(&idev->lock);
3377 while (!list_empty(&idev->addr_list)) {
3378 ifa = list_first_entry(&idev->addr_list,
3379 struct inet6_ifaddr, if_list);
3380 addrconf_del_dad_work(ifa);
3382 list_del(&ifa->if_list);
3384 write_unlock_bh(&idev->lock);
3386 spin_lock_bh(&ifa->lock);
3388 ifa->state = INET6_IFADDR_STATE_DEAD;
3389 spin_unlock_bh(&ifa->lock);
3391 if (state != INET6_IFADDR_STATE_DEAD) {
3392 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3393 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3397 write_lock_bh(&idev->lock);
3400 write_unlock_bh(&idev->lock);
3402 /* Step 5: Discard anycast and multicast list */
3404 ipv6_ac_destroy_dev(idev);
3405 ipv6_mc_destroy_dev(idev);
3410 idev->tstamp = jiffies;
3412 /* Last: Shot the device (if unregistered) */
3414 addrconf_sysctl_unregister(idev);
3415 neigh_parms_release(&nd_tbl, idev->nd_parms);
3416 neigh_ifdown(&nd_tbl, dev);
3422 static void addrconf_rs_timer(unsigned long data)
3424 struct inet6_dev *idev = (struct inet6_dev *)data;
3425 struct net_device *dev = idev->dev;
3426 struct in6_addr lladdr;
3428 write_lock(&idev->lock);
3429 if (idev->dead || !(idev->if_flags & IF_READY))
3432 if (!ipv6_accept_ra(idev))
3435 /* Announcement received after solicitation was sent */
3436 if (idev->if_flags & IF_RA_RCVD)
3439 if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
3440 write_unlock(&idev->lock);
3441 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3442 ndisc_send_rs(dev, &lladdr,
3443 &in6addr_linklocal_allrouters);
3447 write_lock(&idev->lock);
3448 /* The wait after the last probe can be shorter */
3449 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3450 idev->cnf.rtr_solicits) ?
3451 idev->cnf.rtr_solicit_delay :
3452 idev->cnf.rtr_solicit_interval);
3455 * Note: we do not support deprecated "all on-link"
3456 * assumption any longer.
3458 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3462 write_unlock(&idev->lock);
3468 * Duplicate Address Detection
3470 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3472 unsigned long rand_num;
3473 struct inet6_dev *idev = ifp->idev;
3475 if (ifp->flags & IFA_F_OPTIMISTIC)
3478 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3480 ifp->dad_probes = idev->cnf.dad_transmits;
3481 addrconf_mod_dad_work(ifp, rand_num);
3484 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3486 struct inet6_dev *idev = ifp->idev;
3487 struct net_device *dev = idev->dev;
3489 addrconf_join_solict(dev, &ifp->addr);
3491 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3493 read_lock_bh(&idev->lock);
3494 spin_lock(&ifp->lock);
3495 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3498 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3499 idev->cnf.accept_dad < 1 ||
3500 !(ifp->flags&IFA_F_TENTATIVE) ||
3501 ifp->flags & IFA_F_NODAD) {
3502 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3503 spin_unlock(&ifp->lock);
3504 read_unlock_bh(&idev->lock);
3506 addrconf_dad_completed(ifp);
3510 if (!(idev->if_flags & IF_READY)) {
3511 spin_unlock(&ifp->lock);
3512 read_unlock_bh(&idev->lock);
3514 * If the device is not ready:
3515 * - keep it tentative if it is a permanent address.
3516 * - otherwise, kill it.
3519 addrconf_dad_stop(ifp, 0);
3524 * Optimistic nodes can start receiving
3527 if (ifp->flags & IFA_F_OPTIMISTIC) {
3528 ip6_ins_rt(ifp->rt);
3529 if (ipv6_use_optimistic_addr(idev)) {
3530 /* Because optimistic nodes can use this address,
3531 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3533 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3537 addrconf_dad_kick(ifp);
3539 spin_unlock(&ifp->lock);
3540 read_unlock_bh(&idev->lock);
3543 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3545 bool begin_dad = false;
3547 spin_lock_bh(&ifp->lock);
3548 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3549 ifp->state = INET6_IFADDR_STATE_PREDAD;
3552 spin_unlock_bh(&ifp->lock);
3555 addrconf_mod_dad_work(ifp, 0);
3558 static void addrconf_dad_work(struct work_struct *w)
3560 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3561 struct inet6_ifaddr,
3563 struct inet6_dev *idev = ifp->idev;
3564 struct in6_addr mcaddr;
3570 } action = DAD_PROCESS;
3574 spin_lock_bh(&ifp->lock);
3575 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3577 ifp->state = INET6_IFADDR_STATE_DAD;
3578 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3580 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3582 spin_unlock_bh(&ifp->lock);
3584 if (action == DAD_BEGIN) {
3585 addrconf_dad_begin(ifp);
3587 } else if (action == DAD_ABORT) {
3588 addrconf_dad_stop(ifp, 1);
3592 if (!ifp->dad_probes && addrconf_dad_end(ifp))
3595 write_lock_bh(&idev->lock);
3596 if (idev->dead || !(idev->if_flags & IF_READY)) {
3597 write_unlock_bh(&idev->lock);
3601 spin_lock(&ifp->lock);
3602 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3603 spin_unlock(&ifp->lock);
3604 write_unlock_bh(&idev->lock);
3608 if (ifp->dad_probes == 0) {
3610 * DAD was successful
3613 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3614 spin_unlock(&ifp->lock);
3615 write_unlock_bh(&idev->lock);
3617 addrconf_dad_completed(ifp);
3623 addrconf_mod_dad_work(ifp,
3624 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
3625 spin_unlock(&ifp->lock);
3626 write_unlock_bh(&idev->lock);
3628 /* send a neighbour solicitation for our addr */
3629 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3630 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any, NULL);
3636 /* ifp->idev must be at least read locked */
3637 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3639 struct inet6_ifaddr *ifpiter;
3640 struct inet6_dev *idev = ifp->idev;
3642 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3643 if (ifpiter->scope > IFA_LINK)
3645 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3646 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3647 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3654 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3656 struct net_device *dev = ifp->idev->dev;
3657 struct in6_addr lladdr;
3658 bool send_rs, send_mld;
3660 addrconf_del_dad_work(ifp);
3663 * Configure the address for reception. Now it is valid.
3666 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3668 /* If added prefix is link local and we are prepared to process
3669 router advertisements, start sending router solicitations.
3672 read_lock_bh(&ifp->idev->lock);
3673 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
3674 send_rs = send_mld &&
3675 ipv6_accept_ra(ifp->idev) &&
3676 ifp->idev->cnf.rtr_solicits > 0 &&
3677 (dev->flags&IFF_LOOPBACK) == 0;
3678 read_unlock_bh(&ifp->idev->lock);
3680 /* While dad is in progress mld report's source address is in6_addrany.
3681 * Resend with proper ll now.
3684 ipv6_mc_dad_complete(ifp->idev);
3688 * If a host as already performed a random delay
3689 * [...] as part of DAD [...] there is no need
3690 * to delay again before sending the first RS
3692 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3694 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
3696 write_lock_bh(&ifp->idev->lock);
3697 spin_lock(&ifp->lock);
3698 ifp->idev->rs_probes = 1;
3699 ifp->idev->if_flags |= IF_RS_SENT;
3700 addrconf_mod_rs_timer(ifp->idev,
3701 ifp->idev->cnf.rtr_solicit_interval);
3702 spin_unlock(&ifp->lock);
3703 write_unlock_bh(&ifp->idev->lock);
3707 static void addrconf_dad_run(struct inet6_dev *idev)
3709 struct inet6_ifaddr *ifp;
3711 read_lock_bh(&idev->lock);
3712 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3713 spin_lock(&ifp->lock);
3714 if (ifp->flags & IFA_F_TENTATIVE &&
3715 ifp->state == INET6_IFADDR_STATE_DAD)
3716 addrconf_dad_kick(ifp);
3717 spin_unlock(&ifp->lock);
3719 read_unlock_bh(&idev->lock);
3722 #ifdef CONFIG_PROC_FS
3723 struct if6_iter_state {
3724 struct seq_net_private p;
3729 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3731 struct inet6_ifaddr *ifa = NULL;
3732 struct if6_iter_state *state = seq->private;
3733 struct net *net = seq_file_net(seq);
3736 /* initial bucket if pos is 0 */
3742 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3743 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
3745 if (!net_eq(dev_net(ifa->idev->dev), net))
3747 /* sync with offset */
3748 if (p < state->offset) {
3756 /* prepare for next bucket */
3763 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3764 struct inet6_ifaddr *ifa)
3766 struct if6_iter_state *state = seq->private;
3767 struct net *net = seq_file_net(seq);
3769 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
3770 if (!net_eq(dev_net(ifa->idev->dev), net))
3776 while (++state->bucket < IN6_ADDR_HSIZE) {
3778 hlist_for_each_entry_rcu_bh(ifa,
3779 &inet6_addr_lst[state->bucket], addr_lst) {
3780 if (!net_eq(dev_net(ifa->idev->dev), net))
3790 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3794 return if6_get_first(seq, *pos);
3797 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3799 struct inet6_ifaddr *ifa;
3801 ifa = if6_get_next(seq, v);
3806 static void if6_seq_stop(struct seq_file *seq, void *v)
3809 rcu_read_unlock_bh();
3812 static int if6_seq_show(struct seq_file *seq, void *v)
3814 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3815 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3817 ifp->idev->dev->ifindex,
3821 ifp->idev->dev->name);
3825 static const struct seq_operations if6_seq_ops = {
3826 .start = if6_seq_start,
3827 .next = if6_seq_next,
3828 .show = if6_seq_show,
3829 .stop = if6_seq_stop,
3832 static int if6_seq_open(struct inode *inode, struct file *file)
3834 return seq_open_net(inode, file, &if6_seq_ops,
3835 sizeof(struct if6_iter_state));
3838 static const struct file_operations if6_fops = {
3839 .owner = THIS_MODULE,
3840 .open = if6_seq_open,
3842 .llseek = seq_lseek,
3843 .release = seq_release_net,
3846 static int __net_init if6_proc_net_init(struct net *net)
3848 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
3853 static void __net_exit if6_proc_net_exit(struct net *net)
3855 remove_proc_entry("if_inet6", net->proc_net);
3858 static struct pernet_operations if6_proc_net_ops = {
3859 .init = if6_proc_net_init,
3860 .exit = if6_proc_net_exit,
3863 int __init if6_proc_init(void)
3865 return register_pernet_subsys(&if6_proc_net_ops);
3868 void if6_proc_exit(void)
3870 unregister_pernet_subsys(&if6_proc_net_ops);
3872 #endif /* CONFIG_PROC_FS */
3874 #if IS_ENABLED(CONFIG_IPV6_MIP6)
3875 /* Check if address is a home address configured on any interface. */
3876 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3879 struct inet6_ifaddr *ifp = NULL;
3880 unsigned int hash = inet6_addr_hash(addr);
3883 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
3884 if (!net_eq(dev_net(ifp->idev->dev), net))
3886 if (ipv6_addr_equal(&ifp->addr, addr) &&
3887 (ifp->flags & IFA_F_HOMEADDRESS)) {
3892 rcu_read_unlock_bh();
3898 * Periodic address status verification
3901 static void addrconf_verify_rtnl(void)
3903 unsigned long now, next, next_sec, next_sched;
3904 struct inet6_ifaddr *ifp;
3911 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3913 cancel_delayed_work(&addr_chk_work);
3915 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3917 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
3920 /* When setting preferred_lft to a value not zero or
3921 * infinity, while valid_lft is infinity
3922 * IFA_F_PERMANENT has a non-infinity life time.
3924 if ((ifp->flags & IFA_F_PERMANENT) &&
3925 (ifp->prefered_lft == INFINITY_LIFE_TIME))
3928 spin_lock(&ifp->lock);
3929 /* We try to batch several events at once. */
3930 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3932 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3933 age >= ifp->valid_lft) {
3934 spin_unlock(&ifp->lock);
3938 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3939 spin_unlock(&ifp->lock);
3941 } else if (age >= ifp->prefered_lft) {
3942 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3945 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3947 ifp->flags |= IFA_F_DEPRECATED;
3950 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
3951 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
3952 next = ifp->tstamp + ifp->valid_lft * HZ;
3954 spin_unlock(&ifp->lock);
3959 ipv6_ifa_notify(0, ifp);
3963 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3964 !(ifp->flags&IFA_F_TENTATIVE)) {
3965 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3966 ifp->idev->cnf.dad_transmits *
3967 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
3969 if (age >= ifp->prefered_lft - regen_advance) {
3970 struct inet6_ifaddr *ifpub = ifp->ifpub;
3971 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3972 next = ifp->tstamp + ifp->prefered_lft * HZ;
3973 if (!ifp->regen_count && ifpub) {
3976 in6_ifa_hold(ifpub);
3977 spin_unlock(&ifp->lock);
3979 spin_lock(&ifpub->lock);
3980 ifpub->regen_count = 0;
3981 spin_unlock(&ifpub->lock);
3982 ipv6_create_tempaddr(ifpub, ifp);
3987 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3988 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3989 spin_unlock(&ifp->lock);
3991 /* ifp->prefered_lft <= ifp->valid_lft */
3992 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3993 next = ifp->tstamp + ifp->prefered_lft * HZ;
3994 spin_unlock(&ifp->lock);
3999 next_sec = round_jiffies_up(next);
4002 /* If rounded timeout is accurate enough, accept it. */
4003 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4004 next_sched = next_sec;
4006 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4007 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4008 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4010 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4011 now, next, next_sec, next_sched);
4012 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
4013 rcu_read_unlock_bh();
4016 static void addrconf_verify_work(struct work_struct *w)
4019 addrconf_verify_rtnl();
4023 static void addrconf_verify(void)
4025 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4028 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4029 struct in6_addr **peer_pfx)
4031 struct in6_addr *pfx = NULL;
4036 pfx = nla_data(addr);
4039 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4041 pfx = nla_data(local);
4047 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4048 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4049 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4050 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
4051 [IFA_FLAGS] = { .len = sizeof(u32) },
4055 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
4057 struct net *net = sock_net(skb->sk);
4058 struct ifaddrmsg *ifm;
4059 struct nlattr *tb[IFA_MAX+1];
4060 struct in6_addr *pfx, *peer_pfx;
4064 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4068 ifm = nlmsg_data(nlh);
4069 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4073 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4075 /* We ignore other flags so far. */
4076 ifa_flags &= IFA_F_MANAGETEMPADDR;
4078 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4079 ifm->ifa_prefixlen);
4082 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
4083 u32 prefered_lft, u32 valid_lft)
4087 unsigned long timeout;
4088 bool was_managetempaddr;
4089 bool had_prefixroute;
4093 if (!valid_lft || (prefered_lft > valid_lft))
4096 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4097 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4100 timeout = addrconf_timeout_fixup(valid_lft, HZ);
4101 if (addrconf_finite_timeout(timeout)) {
4102 expires = jiffies_to_clock_t(timeout * HZ);
4103 valid_lft = timeout;
4104 flags = RTF_EXPIRES;
4108 ifa_flags |= IFA_F_PERMANENT;
4111 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4112 if (addrconf_finite_timeout(timeout)) {
4114 ifa_flags |= IFA_F_DEPRECATED;
4115 prefered_lft = timeout;
4118 spin_lock_bh(&ifp->lock);
4119 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4120 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4121 !(ifp->flags & IFA_F_NOPREFIXROUTE);
4122 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4123 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4124 IFA_F_NOPREFIXROUTE);
4125 ifp->flags |= ifa_flags;
4126 ifp->tstamp = jiffies;
4127 ifp->valid_lft = valid_lft;
4128 ifp->prefered_lft = prefered_lft;
4130 spin_unlock_bh(&ifp->lock);
4131 if (!(ifp->flags&IFA_F_TENTATIVE))
4132 ipv6_ifa_notify(0, ifp);
4134 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4135 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4137 } else if (had_prefixroute) {
4138 enum cleanup_prefix_rt_t action;
4139 unsigned long rt_expires;
4141 write_lock_bh(&ifp->idev->lock);
4142 action = check_cleanup_prefix_route(ifp, &rt_expires);
4143 write_unlock_bh(&ifp->idev->lock);
4145 if (action != CLEANUP_PREFIX_RT_NOP) {
4146 cleanup_prefix_route(ifp, rt_expires,
4147 action == CLEANUP_PREFIX_RT_DEL);
4151 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4152 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4153 valid_lft = prefered_lft = 0;
4154 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4155 !was_managetempaddr, jiffies);
4158 addrconf_verify_rtnl();
4164 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
4166 struct net *net = sock_net(skb->sk);
4167 struct ifaddrmsg *ifm;
4168 struct nlattr *tb[IFA_MAX+1];
4169 struct in6_addr *pfx, *peer_pfx;
4170 struct inet6_ifaddr *ifa;
4171 struct net_device *dev;
4172 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
4176 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4180 ifm = nlmsg_data(nlh);
4181 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4185 if (tb[IFA_CACHEINFO]) {
4186 struct ifa_cacheinfo *ci;
4188 ci = nla_data(tb[IFA_CACHEINFO]);
4189 valid_lft = ci->ifa_valid;
4190 preferred_lft = ci->ifa_prefered;
4192 preferred_lft = INFINITY_LIFE_TIME;
4193 valid_lft = INFINITY_LIFE_TIME;
4196 dev = __dev_get_by_index(net, ifm->ifa_index);
4200 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4202 /* We ignore other flags so far. */
4203 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4204 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
4206 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
4209 * It would be best to check for !NLM_F_CREATE here but
4210 * userspace already relies on not having to provide this.
4212 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
4213 ifm->ifa_prefixlen, ifa_flags,
4214 preferred_lft, valid_lft);
4217 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4218 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4221 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
4228 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4229 u8 scope, int ifindex)
4231 struct ifaddrmsg *ifm;
4233 ifm = nlmsg_data(nlh);
4234 ifm->ifa_family = AF_INET6;
4235 ifm->ifa_prefixlen = prefixlen;
4236 ifm->ifa_flags = flags;
4237 ifm->ifa_scope = scope;
4238 ifm->ifa_index = ifindex;
4241 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4242 unsigned long tstamp, u32 preferred, u32 valid)
4244 struct ifa_cacheinfo ci;
4246 ci.cstamp = cstamp_delta(cstamp);
4247 ci.tstamp = cstamp_delta(tstamp);
4248 ci.ifa_prefered = preferred;
4249 ci.ifa_valid = valid;
4251 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4254 static inline int rt_scope(int ifa_scope)
4256 if (ifa_scope & IFA_HOST)
4257 return RT_SCOPE_HOST;
4258 else if (ifa_scope & IFA_LINK)
4259 return RT_SCOPE_LINK;
4260 else if (ifa_scope & IFA_SITE)
4261 return RT_SCOPE_SITE;
4263 return RT_SCOPE_UNIVERSE;
4266 static inline int inet6_ifaddr_msgsize(void)
4268 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4269 + nla_total_size(16) /* IFA_LOCAL */
4270 + nla_total_size(16) /* IFA_ADDRESS */
4271 + nla_total_size(sizeof(struct ifa_cacheinfo))
4272 + nla_total_size(4) /* IFA_FLAGS */;
4275 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
4276 u32 portid, u32 seq, int event, unsigned int flags)
4278 struct nlmsghdr *nlh;
4279 u32 preferred, valid;
4281 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4285 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4286 ifa->idev->dev->ifindex);
4288 if (!((ifa->flags&IFA_F_PERMANENT) &&
4289 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
4290 preferred = ifa->prefered_lft;
4291 valid = ifa->valid_lft;
4292 if (preferred != INFINITY_LIFE_TIME) {
4293 long tval = (jiffies - ifa->tstamp)/HZ;
4294 if (preferred > tval)
4298 if (valid != INFINITY_LIFE_TIME) {
4306 preferred = INFINITY_LIFE_TIME;
4307 valid = INFINITY_LIFE_TIME;
4310 if (!ipv6_addr_any(&ifa->peer_addr)) {
4311 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4312 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
4315 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
4318 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4321 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4324 nlmsg_end(skb, nlh);
4328 nlmsg_cancel(skb, nlh);
4332 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
4333 u32 portid, u32 seq, int event, u16 flags)
4335 struct nlmsghdr *nlh;
4336 u8 scope = RT_SCOPE_UNIVERSE;
4337 int ifindex = ifmca->idev->dev->ifindex;
4339 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4340 scope = RT_SCOPE_SITE;
4342 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4346 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4347 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
4348 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
4349 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4350 nlmsg_cancel(skb, nlh);
4354 nlmsg_end(skb, nlh);
4358 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
4359 u32 portid, u32 seq, int event, unsigned int flags)
4361 struct nlmsghdr *nlh;
4362 u8 scope = RT_SCOPE_UNIVERSE;
4363 int ifindex = ifaca->aca_idev->dev->ifindex;
4365 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4366 scope = RT_SCOPE_SITE;
4368 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4372 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4373 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
4374 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
4375 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4376 nlmsg_cancel(skb, nlh);
4380 nlmsg_end(skb, nlh);
4390 /* called with rcu_read_lock() */
4391 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4392 struct netlink_callback *cb, enum addr_type_t type,
4393 int s_ip_idx, int *p_ip_idx)
4395 struct ifmcaddr6 *ifmca;
4396 struct ifacaddr6 *ifaca;
4398 int ip_idx = *p_ip_idx;
4400 read_lock_bh(&idev->lock);
4402 case UNICAST_ADDR: {
4403 struct inet6_ifaddr *ifa;
4405 /* unicast address incl. temp addr */
4406 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4407 if (++ip_idx < s_ip_idx)
4409 err = inet6_fill_ifaddr(skb, ifa,
4410 NETLINK_CB(cb->skb).portid,
4416 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4420 case MULTICAST_ADDR:
4421 /* multicast address */
4422 for (ifmca = idev->mc_list; ifmca;
4423 ifmca = ifmca->next, ip_idx++) {
4424 if (ip_idx < s_ip_idx)
4426 err = inet6_fill_ifmcaddr(skb, ifmca,
4427 NETLINK_CB(cb->skb).portid,
4436 /* anycast address */
4437 for (ifaca = idev->ac_list; ifaca;
4438 ifaca = ifaca->aca_next, ip_idx++) {
4439 if (ip_idx < s_ip_idx)
4441 err = inet6_fill_ifacaddr(skb, ifaca,
4442 NETLINK_CB(cb->skb).portid,
4453 read_unlock_bh(&idev->lock);
4458 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4459 enum addr_type_t type)
4461 struct net *net = sock_net(skb->sk);
4464 int s_idx, s_ip_idx;
4465 struct net_device *dev;
4466 struct inet6_dev *idev;
4467 struct hlist_head *head;
4470 s_idx = idx = cb->args[1];
4471 s_ip_idx = ip_idx = cb->args[2];
4474 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4475 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4477 head = &net->dev_index_head[h];
4478 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4481 if (h > s_h || idx > s_idx)
4484 idev = __in6_dev_get(dev);
4488 if (in6_dump_addrs(idev, skb, cb, type,
4489 s_ip_idx, &ip_idx) < 0)
4499 cb->args[2] = ip_idx;
4504 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4506 enum addr_type_t type = UNICAST_ADDR;
4508 return inet6_dump_addr(skb, cb, type);
4511 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4513 enum addr_type_t type = MULTICAST_ADDR;
4515 return inet6_dump_addr(skb, cb, type);
4519 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4521 enum addr_type_t type = ANYCAST_ADDR;
4523 return inet6_dump_addr(skb, cb, type);
4526 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
4528 struct net *net = sock_net(in_skb->sk);
4529 struct ifaddrmsg *ifm;
4530 struct nlattr *tb[IFA_MAX+1];
4531 struct in6_addr *addr = NULL, *peer;
4532 struct net_device *dev = NULL;
4533 struct inet6_ifaddr *ifa;
4534 struct sk_buff *skb;
4537 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4541 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4547 ifm = nlmsg_data(nlh);
4549 dev = __dev_get_by_index(net, ifm->ifa_index);
4551 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4553 err = -EADDRNOTAVAIL;
4557 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4563 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4564 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4566 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4567 WARN_ON(err == -EMSGSIZE);
4571 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4578 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4580 struct sk_buff *skb;
4581 struct net *net = dev_net(ifa->idev->dev);
4584 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4588 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4590 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4591 WARN_ON(err == -EMSGSIZE);
4595 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4599 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4602 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4603 __s32 *array, int bytes)
4605 BUG_ON(bytes < (DEVCONF_MAX * 4));
4607 memset(array, 0, bytes);
4608 array[DEVCONF_FORWARDING] = cnf->forwarding;
4609 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4610 array[DEVCONF_MTU6] = cnf->mtu6;
4611 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4612 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4613 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4614 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4615 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4616 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4617 jiffies_to_msecs(cnf->rtr_solicit_interval);
4618 array[DEVCONF_RTR_SOLICIT_DELAY] =
4619 jiffies_to_msecs(cnf->rtr_solicit_delay);
4620 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4621 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4622 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4623 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4624 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
4625 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4626 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4627 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4628 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4629 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4630 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4631 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4632 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
4633 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4634 #ifdef CONFIG_IPV6_ROUTER_PREF
4635 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4636 array[DEVCONF_RTR_PROBE_INTERVAL] =
4637 jiffies_to_msecs(cnf->rtr_probe_interval);
4638 #ifdef CONFIG_IPV6_ROUTE_INFO
4639 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4642 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4643 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4644 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4645 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4646 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
4648 #ifdef CONFIG_IPV6_MROUTE
4649 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4651 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4652 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4653 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4654 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4655 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
4656 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
4657 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
4658 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
4659 /* we omit DEVCONF_STABLE_SECRET for now */
4660 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
4663 static inline size_t inet6_ifla6_size(void)
4665 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4666 + nla_total_size(sizeof(struct ifla_cacheinfo))
4667 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4668 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4669 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4670 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
4673 static inline size_t inet6_if_nlmsg_size(void)
4675 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4676 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4677 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4678 + nla_total_size(4) /* IFLA_MTU */
4679 + nla_total_size(4) /* IFLA_LINK */
4680 + nla_total_size(1) /* IFLA_OPERSTATE */
4681 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4684 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4685 int items, int bytes)
4688 int pad = bytes - sizeof(u64) * items;
4691 /* Use put_unaligned() because stats may not be aligned for u64. */
4692 put_unaligned(items, &stats[0]);
4693 for (i = 1; i < items; i++)
4694 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4696 memset(&stats[items], 0, pad);
4699 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
4700 int bytes, size_t syncpoff)
4703 u64 buff[IPSTATS_MIB_MAX];
4704 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
4708 memset(buff, 0, sizeof(buff));
4709 buff[0] = IPSTATS_MIB_MAX;
4711 for_each_possible_cpu(c) {
4712 for (i = 1; i < IPSTATS_MIB_MAX; i++)
4713 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
4716 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
4717 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
4720 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4724 case IFLA_INET6_STATS:
4725 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
4726 offsetof(struct ipstats_mib, syncp));
4728 case IFLA_INET6_ICMP6STATS:
4729 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
4734 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4737 struct ifla_cacheinfo ci;
4739 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4740 goto nla_put_failure;
4741 ci.max_reasm_len = IPV6_MAXPLEN;
4742 ci.tstamp = cstamp_delta(idev->tstamp);
4743 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4744 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
4745 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4746 goto nla_put_failure;
4747 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4749 goto nla_put_failure;
4750 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4752 /* XXX - MC not implemented */
4754 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4756 goto nla_put_failure;
4757 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4759 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4761 goto nla_put_failure;
4762 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4764 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4766 goto nla_put_failure;
4768 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode))
4769 goto nla_put_failure;
4771 read_lock_bh(&idev->lock);
4772 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4773 read_unlock_bh(&idev->lock);
4781 static size_t inet6_get_link_af_size(const struct net_device *dev)
4783 if (!__in6_dev_get(dev))
4786 return inet6_ifla6_size();
4789 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4791 struct inet6_dev *idev = __in6_dev_get(dev);
4796 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4802 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4804 struct inet6_ifaddr *ifp;
4805 struct net_device *dev = idev->dev;
4806 bool update_rs = false;
4807 struct in6_addr ll_addr;
4813 if (ipv6_addr_any(token))
4815 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4817 if (!ipv6_accept_ra(idev))
4819 if (idev->cnf.rtr_solicits <= 0)
4822 write_lock_bh(&idev->lock);
4824 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4825 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4827 write_unlock_bh(&idev->lock);
4829 if (!idev->dead && (idev->if_flags & IF_READY) &&
4830 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4831 IFA_F_OPTIMISTIC)) {
4833 /* If we're not ready, then normal ifup will take care
4834 * of this. Otherwise, we need to request our rs here.
4836 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4840 write_lock_bh(&idev->lock);
4843 idev->if_flags |= IF_RS_SENT;
4844 idev->rs_probes = 1;
4845 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
4848 /* Well, that's kinda nasty ... */
4849 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4850 spin_lock(&ifp->lock);
4851 if (ifp->tokenized) {
4853 ifp->prefered_lft = 0;
4855 spin_unlock(&ifp->lock);
4858 write_unlock_bh(&idev->lock);
4859 inet6_ifinfo_notify(RTM_NEWLINK, idev);
4860 addrconf_verify_rtnl();
4864 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
4865 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
4866 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
4869 static int inet6_validate_link_af(const struct net_device *dev,
4870 const struct nlattr *nla)
4872 struct nlattr *tb[IFLA_INET6_MAX + 1];
4874 if (dev && !__in6_dev_get(dev))
4875 return -EAFNOSUPPORT;
4877 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy);
4880 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4883 struct inet6_dev *idev = __in6_dev_get(dev);
4884 struct nlattr *tb[IFLA_INET6_MAX + 1];
4887 return -EAFNOSUPPORT;
4889 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4892 if (tb[IFLA_INET6_TOKEN]) {
4893 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
4898 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
4899 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
4901 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
4902 mode != IN6_ADDR_GEN_MODE_NONE &&
4903 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY)
4906 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
4907 !idev->cnf.stable_secret.initialized &&
4908 !dev_net(dev)->ipv6.devconf_dflt->stable_secret.initialized)
4911 idev->addr_gen_mode = mode;
4918 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4919 u32 portid, u32 seq, int event, unsigned int flags)
4921 struct net_device *dev = idev->dev;
4922 struct ifinfomsg *hdr;
4923 struct nlmsghdr *nlh;
4926 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
4930 hdr = nlmsg_data(nlh);
4931 hdr->ifi_family = AF_INET6;
4933 hdr->ifi_type = dev->type;
4934 hdr->ifi_index = dev->ifindex;
4935 hdr->ifi_flags = dev_get_flags(dev);
4936 hdr->ifi_change = 0;
4938 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4940 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4941 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4942 (dev->ifindex != dev_get_iflink(dev) &&
4943 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
4944 nla_put_u8(skb, IFLA_OPERSTATE,
4945 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
4946 goto nla_put_failure;
4947 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4949 goto nla_put_failure;
4951 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4952 goto nla_put_failure;
4954 nla_nest_end(skb, protoinfo);
4955 nlmsg_end(skb, nlh);
4959 nlmsg_cancel(skb, nlh);
4963 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4965 struct net *net = sock_net(skb->sk);
4968 struct net_device *dev;
4969 struct inet6_dev *idev;
4970 struct hlist_head *head;
4973 s_idx = cb->args[1];
4976 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4978 head = &net->dev_index_head[h];
4979 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4982 idev = __in6_dev_get(dev);
4985 if (inet6_fill_ifinfo(skb, idev,
4986 NETLINK_CB(cb->skb).portid,
4988 RTM_NEWLINK, NLM_F_MULTI) < 0)
5002 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5004 struct sk_buff *skb;
5005 struct net *net = dev_net(idev->dev);
5008 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
5012 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
5014 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5015 WARN_ON(err == -EMSGSIZE);
5019 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
5023 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
5026 static inline size_t inet6_prefix_nlmsg_size(void)
5028 return NLMSG_ALIGN(sizeof(struct prefixmsg))
5029 + nla_total_size(sizeof(struct in6_addr))
5030 + nla_total_size(sizeof(struct prefix_cacheinfo));
5033 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
5034 struct prefix_info *pinfo, u32 portid, u32 seq,
5035 int event, unsigned int flags)
5037 struct prefixmsg *pmsg;
5038 struct nlmsghdr *nlh;
5039 struct prefix_cacheinfo ci;
5041 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
5045 pmsg = nlmsg_data(nlh);
5046 pmsg->prefix_family = AF_INET6;
5047 pmsg->prefix_pad1 = 0;
5048 pmsg->prefix_pad2 = 0;
5049 pmsg->prefix_ifindex = idev->dev->ifindex;
5050 pmsg->prefix_len = pinfo->prefix_len;
5051 pmsg->prefix_type = pinfo->type;
5052 pmsg->prefix_pad3 = 0;
5053 pmsg->prefix_flags = 0;
5055 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5056 if (pinfo->autoconf)
5057 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5059 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5060 goto nla_put_failure;
5061 ci.preferred_time = ntohl(pinfo->prefered);
5062 ci.valid_time = ntohl(pinfo->valid);
5063 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5064 goto nla_put_failure;
5065 nlmsg_end(skb, nlh);
5069 nlmsg_cancel(skb, nlh);
5073 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
5074 struct prefix_info *pinfo)
5076 struct sk_buff *skb;
5077 struct net *net = dev_net(idev->dev);
5080 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
5084 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
5086 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5087 WARN_ON(err == -EMSGSIZE);
5091 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5095 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
5098 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5100 struct net *net = dev_net(ifp->idev->dev);
5105 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5110 * If the address was optimistic
5111 * we inserted the route at the start of
5112 * our DAD process, so we don't need
5115 if (!(ifp->rt->rt6i_node))
5116 ip6_ins_rt(ifp->rt);
5117 if (ifp->idev->cnf.forwarding)
5118 addrconf_join_anycast(ifp);
5119 if (!ipv6_addr_any(&ifp->peer_addr))
5120 addrconf_prefix_route(&ifp->peer_addr, 128,
5121 ifp->idev->dev, 0, 0);
5124 if (ifp->idev->cnf.forwarding)
5125 addrconf_leave_anycast(ifp);
5126 addrconf_leave_solict(ifp->idev, &ifp->addr);
5127 if (!ipv6_addr_any(&ifp->peer_addr)) {
5128 struct rt6_info *rt;
5130 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5131 ifp->idev->dev, 0, 0);
5135 dst_hold(&ifp->rt->dst);
5137 ip6_del_rt(ifp->rt);
5139 rt_genid_bump_ipv6(net);
5142 atomic_inc(&net->ipv6.dev_addr_genid);
5145 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5148 if (likely(ifp->idev->dead == 0))
5149 __ipv6_ifa_notify(event, ifp);
5150 rcu_read_unlock_bh();
5153 #ifdef CONFIG_SYSCTL
5156 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
5157 void __user *buffer, size_t *lenp, loff_t *ppos)
5159 int *valp = ctl->data;
5162 struct ctl_table lctl;
5166 * ctl->data points to idev->cnf.forwarding, we should
5167 * not modify it until we get the rtnl lock.
5172 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5175 ret = addrconf_fixup_forwarding(ctl, valp, val);
5182 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5183 void __user *buffer, size_t *lenp, loff_t *ppos)
5185 struct inet6_dev *idev = ctl->extra1;
5186 int min_mtu = IPV6_MIN_MTU;
5187 struct ctl_table lctl;
5190 lctl.extra1 = &min_mtu;
5191 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5193 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5196 static void dev_disable_change(struct inet6_dev *idev)
5198 struct netdev_notifier_info info;
5200 if (!idev || !idev->dev)
5203 netdev_notifier_info_init(&info, idev->dev);
5204 if (idev->cnf.disable_ipv6)
5205 addrconf_notify(NULL, NETDEV_DOWN, &info);
5207 addrconf_notify(NULL, NETDEV_UP, &info);
5210 static void addrconf_disable_change(struct net *net, __s32 newf)
5212 struct net_device *dev;
5213 struct inet6_dev *idev;
5216 for_each_netdev_rcu(net, dev) {
5217 idev = __in6_dev_get(dev);
5219 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5220 idev->cnf.disable_ipv6 = newf;
5222 dev_disable_change(idev);
5228 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
5233 if (!rtnl_trylock())
5234 return restart_syscall();
5236 net = (struct net *)table->extra2;
5240 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5245 if (p == &net->ipv6.devconf_all->disable_ipv6) {
5246 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5247 addrconf_disable_change(net, newf);
5248 } else if ((!newf) ^ (!old))
5249 dev_disable_change((struct inet6_dev *)table->extra1);
5256 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
5257 void __user *buffer, size_t *lenp, loff_t *ppos)
5259 int *valp = ctl->data;
5262 struct ctl_table lctl;
5266 * ctl->data points to idev->cnf.disable_ipv6, we should
5267 * not modify it until we get the rtnl lock.
5272 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5275 ret = addrconf_disable_ipv6(ctl, valp, val);
5282 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5283 void __user *buffer, size_t *lenp, loff_t *ppos)
5285 int *valp = ctl->data;
5290 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5293 if (write && old != new) {
5294 struct net *net = ctl->extra2;
5296 if (!rtnl_trylock())
5297 return restart_syscall();
5299 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5300 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5301 NETCONFA_IFINDEX_DEFAULT,
5302 net->ipv6.devconf_dflt);
5303 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5304 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5305 NETCONFA_IFINDEX_ALL,
5306 net->ipv6.devconf_all);
5308 struct inet6_dev *idev = ctl->extra1;
5310 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5320 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5321 void __user *buffer, size_t *lenp,
5325 struct in6_addr addr;
5326 char str[IPV6_MAX_STRLEN];
5327 struct ctl_table lctl = *ctl;
5328 struct net *net = ctl->extra2;
5329 struct ipv6_stable_secret *secret = ctl->data;
5331 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5334 lctl.maxlen = IPV6_MAX_STRLEN;
5337 if (!rtnl_trylock())
5338 return restart_syscall();
5340 if (!write && !secret->initialized) {
5346 err = snprintf(str, sizeof(str), "%pI6",
5348 if (err >= sizeof(str)) {
5354 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5358 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5363 secret->initialized = true;
5364 secret->secret = addr;
5366 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5367 struct net_device *dev;
5369 for_each_netdev(net, dev) {
5370 struct inet6_dev *idev = __in6_dev_get(dev);
5373 idev->addr_gen_mode =
5374 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5378 struct inet6_dev *idev = ctl->extra1;
5380 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5390 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
5392 void __user *buffer,
5396 int *valp = ctl->data;
5399 struct ctl_table lctl;
5402 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
5403 * we should not modify it until we get the rtnl lock.
5408 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5411 ret = addrconf_fixup_linkdown(ctl, valp, val);
5417 static struct addrconf_sysctl_table
5419 struct ctl_table_header *sysctl_header;
5420 struct ctl_table addrconf_vars[DEVCONF_MAX+1];
5421 } addrconf_sysctl __read_mostly = {
5422 .sysctl_header = NULL,
5425 .procname = "forwarding",
5426 .data = &ipv6_devconf.forwarding,
5427 .maxlen = sizeof(int),
5429 .proc_handler = addrconf_sysctl_forward,
5432 .procname = "hop_limit",
5433 .data = &ipv6_devconf.hop_limit,
5434 .maxlen = sizeof(int),
5436 .proc_handler = proc_dointvec,
5440 .data = &ipv6_devconf.mtu6,
5441 .maxlen = sizeof(int),
5443 .proc_handler = addrconf_sysctl_mtu,
5446 .procname = "accept_ra",
5447 .data = &ipv6_devconf.accept_ra,
5448 .maxlen = sizeof(int),
5450 .proc_handler = proc_dointvec,
5453 .procname = "accept_redirects",
5454 .data = &ipv6_devconf.accept_redirects,
5455 .maxlen = sizeof(int),
5457 .proc_handler = proc_dointvec,
5460 .procname = "autoconf",
5461 .data = &ipv6_devconf.autoconf,
5462 .maxlen = sizeof(int),
5464 .proc_handler = proc_dointvec,
5467 .procname = "dad_transmits",
5468 .data = &ipv6_devconf.dad_transmits,
5469 .maxlen = sizeof(int),
5471 .proc_handler = proc_dointvec,
5474 .procname = "router_solicitations",
5475 .data = &ipv6_devconf.rtr_solicits,
5476 .maxlen = sizeof(int),
5478 .proc_handler = proc_dointvec,
5481 .procname = "router_solicitation_interval",
5482 .data = &ipv6_devconf.rtr_solicit_interval,
5483 .maxlen = sizeof(int),
5485 .proc_handler = proc_dointvec_jiffies,
5488 .procname = "router_solicitation_delay",
5489 .data = &ipv6_devconf.rtr_solicit_delay,
5490 .maxlen = sizeof(int),
5492 .proc_handler = proc_dointvec_jiffies,
5495 .procname = "force_mld_version",
5496 .data = &ipv6_devconf.force_mld_version,
5497 .maxlen = sizeof(int),
5499 .proc_handler = proc_dointvec,
5502 .procname = "mldv1_unsolicited_report_interval",
5504 &ipv6_devconf.mldv1_unsolicited_report_interval,
5505 .maxlen = sizeof(int),
5507 .proc_handler = proc_dointvec_ms_jiffies,
5510 .procname = "mldv2_unsolicited_report_interval",
5512 &ipv6_devconf.mldv2_unsolicited_report_interval,
5513 .maxlen = sizeof(int),
5515 .proc_handler = proc_dointvec_ms_jiffies,
5518 .procname = "use_tempaddr",
5519 .data = &ipv6_devconf.use_tempaddr,
5520 .maxlen = sizeof(int),
5522 .proc_handler = proc_dointvec,
5525 .procname = "temp_valid_lft",
5526 .data = &ipv6_devconf.temp_valid_lft,
5527 .maxlen = sizeof(int),
5529 .proc_handler = proc_dointvec,
5532 .procname = "temp_prefered_lft",
5533 .data = &ipv6_devconf.temp_prefered_lft,
5534 .maxlen = sizeof(int),
5536 .proc_handler = proc_dointvec,
5539 .procname = "regen_max_retry",
5540 .data = &ipv6_devconf.regen_max_retry,
5541 .maxlen = sizeof(int),
5543 .proc_handler = proc_dointvec,
5546 .procname = "max_desync_factor",
5547 .data = &ipv6_devconf.max_desync_factor,
5548 .maxlen = sizeof(int),
5550 .proc_handler = proc_dointvec,
5553 .procname = "max_addresses",
5554 .data = &ipv6_devconf.max_addresses,
5555 .maxlen = sizeof(int),
5557 .proc_handler = proc_dointvec,
5560 .procname = "accept_ra_defrtr",
5561 .data = &ipv6_devconf.accept_ra_defrtr,
5562 .maxlen = sizeof(int),
5564 .proc_handler = proc_dointvec,
5567 .procname = "accept_ra_min_hop_limit",
5568 .data = &ipv6_devconf.accept_ra_min_hop_limit,
5569 .maxlen = sizeof(int),
5571 .proc_handler = proc_dointvec,
5574 .procname = "accept_ra_pinfo",
5575 .data = &ipv6_devconf.accept_ra_pinfo,
5576 .maxlen = sizeof(int),
5578 .proc_handler = proc_dointvec,
5580 #ifdef CONFIG_IPV6_ROUTER_PREF
5582 .procname = "accept_ra_rtr_pref",
5583 .data = &ipv6_devconf.accept_ra_rtr_pref,
5584 .maxlen = sizeof(int),
5586 .proc_handler = proc_dointvec,
5589 .procname = "router_probe_interval",
5590 .data = &ipv6_devconf.rtr_probe_interval,
5591 .maxlen = sizeof(int),
5593 .proc_handler = proc_dointvec_jiffies,
5595 #ifdef CONFIG_IPV6_ROUTE_INFO
5597 .procname = "accept_ra_rt_info_max_plen",
5598 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
5599 .maxlen = sizeof(int),
5601 .proc_handler = proc_dointvec,
5606 .procname = "proxy_ndp",
5607 .data = &ipv6_devconf.proxy_ndp,
5608 .maxlen = sizeof(int),
5610 .proc_handler = addrconf_sysctl_proxy_ndp,
5613 .procname = "accept_source_route",
5614 .data = &ipv6_devconf.accept_source_route,
5615 .maxlen = sizeof(int),
5617 .proc_handler = proc_dointvec,
5619 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5621 .procname = "optimistic_dad",
5622 .data = &ipv6_devconf.optimistic_dad,
5623 .maxlen = sizeof(int),
5625 .proc_handler = proc_dointvec,
5629 .procname = "use_optimistic",
5630 .data = &ipv6_devconf.use_optimistic,
5631 .maxlen = sizeof(int),
5633 .proc_handler = proc_dointvec,
5637 #ifdef CONFIG_IPV6_MROUTE
5639 .procname = "mc_forwarding",
5640 .data = &ipv6_devconf.mc_forwarding,
5641 .maxlen = sizeof(int),
5643 .proc_handler = proc_dointvec,
5647 .procname = "disable_ipv6",
5648 .data = &ipv6_devconf.disable_ipv6,
5649 .maxlen = sizeof(int),
5651 .proc_handler = addrconf_sysctl_disable,
5654 .procname = "accept_dad",
5655 .data = &ipv6_devconf.accept_dad,
5656 .maxlen = sizeof(int),
5658 .proc_handler = proc_dointvec,
5661 .procname = "force_tllao",
5662 .data = &ipv6_devconf.force_tllao,
5663 .maxlen = sizeof(int),
5665 .proc_handler = proc_dointvec
5668 .procname = "ndisc_notify",
5669 .data = &ipv6_devconf.ndisc_notify,
5670 .maxlen = sizeof(int),
5672 .proc_handler = proc_dointvec
5675 .procname = "suppress_frag_ndisc",
5676 .data = &ipv6_devconf.suppress_frag_ndisc,
5677 .maxlen = sizeof(int),
5679 .proc_handler = proc_dointvec
5682 .procname = "accept_ra_from_local",
5683 .data = &ipv6_devconf.accept_ra_from_local,
5684 .maxlen = sizeof(int),
5686 .proc_handler = proc_dointvec,
5689 .procname = "accept_ra_mtu",
5690 .data = &ipv6_devconf.accept_ra_mtu,
5691 .maxlen = sizeof(int),
5693 .proc_handler = proc_dointvec,
5696 .procname = "stable_secret",
5697 .data = &ipv6_devconf.stable_secret,
5698 .maxlen = IPV6_MAX_STRLEN,
5700 .proc_handler = addrconf_sysctl_stable_secret,
5703 .procname = "use_oif_addrs_only",
5704 .data = &ipv6_devconf.use_oif_addrs_only,
5705 .maxlen = sizeof(int),
5707 .proc_handler = proc_dointvec,
5710 .procname = "ignore_routes_with_linkdown",
5711 .data = &ipv6_devconf.ignore_routes_with_linkdown,
5712 .maxlen = sizeof(int),
5714 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
5722 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
5723 struct inet6_dev *idev, struct ipv6_devconf *p)
5726 struct addrconf_sysctl_table *t;
5727 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
5729 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
5733 for (i = 0; t->addrconf_vars[i].data; i++) {
5734 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
5735 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
5736 t->addrconf_vars[i].extra2 = net;
5739 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
5741 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
5742 if (!t->sysctl_header)
5754 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5756 struct addrconf_sysctl_table *t;
5763 unregister_net_sysctl_table(t->sysctl_header);
5767 static int addrconf_sysctl_register(struct inet6_dev *idev)
5771 if (!sysctl_dev_name_is_allowed(idev->dev->name))
5774 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
5775 &ndisc_ifinfo_sysctl_change);
5778 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
5781 neigh_sysctl_unregister(idev->nd_parms);
5786 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
5788 __addrconf_sysctl_unregister(&idev->cnf);
5789 neigh_sysctl_unregister(idev->nd_parms);
5795 static int __net_init addrconf_init_net(struct net *net)
5798 struct ipv6_devconf *all, *dflt;
5800 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
5804 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
5806 goto err_alloc_dflt;
5808 /* these will be inherited by all namespaces */
5809 dflt->autoconf = ipv6_defaults.autoconf;
5810 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
5812 dflt->stable_secret.initialized = false;
5813 all->stable_secret.initialized = false;
5815 net->ipv6.devconf_all = all;
5816 net->ipv6.devconf_dflt = dflt;
5818 #ifdef CONFIG_SYSCTL
5819 err = __addrconf_sysctl_register(net, "all", NULL, all);
5823 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
5829 #ifdef CONFIG_SYSCTL
5831 __addrconf_sysctl_unregister(all);
5841 static void __net_exit addrconf_exit_net(struct net *net)
5843 #ifdef CONFIG_SYSCTL
5844 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5845 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5847 kfree(net->ipv6.devconf_dflt);
5848 kfree(net->ipv6.devconf_all);
5851 static struct pernet_operations addrconf_ops = {
5852 .init = addrconf_init_net,
5853 .exit = addrconf_exit_net,
5856 static struct rtnl_af_ops inet6_ops __read_mostly = {
5858 .fill_link_af = inet6_fill_link_af,
5859 .get_link_af_size = inet6_get_link_af_size,
5860 .validate_link_af = inet6_validate_link_af,
5861 .set_link_af = inet6_set_link_af,
5865 * Init / cleanup code
5868 int __init addrconf_init(void)
5870 struct inet6_dev *idev;
5873 err = ipv6_addr_label_init();
5875 pr_crit("%s: cannot initialize default policy table: %d\n",
5880 err = register_pernet_subsys(&addrconf_ops);
5884 addrconf_wq = create_workqueue("ipv6_addrconf");
5890 /* The addrconf netdev notifier requires that loopback_dev
5891 * has it's ipv6 private information allocated and setup
5892 * before it can bring up and give link-local addresses
5893 * to other devices which are up.
5895 * Unfortunately, loopback_dev is not necessarily the first
5896 * entry in the global dev_base list of net devices. In fact,
5897 * it is likely to be the very last entry on that list.
5898 * So this causes the notifier registry below to try and
5899 * give link-local addresses to all devices besides loopback_dev
5900 * first, then loopback_dev, which cases all the non-loopback_dev
5901 * devices to fail to get a link-local address.
5903 * So, as a temporary fix, allocate the ipv6 structure for
5904 * loopback_dev first by hand.
5905 * Longer term, all of the dependencies ipv6 has upon the loopback
5906 * device and it being up should be removed.
5909 idev = ipv6_add_dev(init_net.loopback_dev);
5912 err = PTR_ERR(idev);
5916 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5917 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5919 register_netdevice_notifier(&ipv6_dev_notf);
5923 rtnl_af_register(&inet6_ops);
5925 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5930 /* Only the first call to __rtnl_register can fail */
5931 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5932 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5933 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5934 inet6_dump_ifaddr, NULL);
5935 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5936 inet6_dump_ifmcaddr, NULL);
5937 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5938 inet6_dump_ifacaddr, NULL);
5939 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
5940 inet6_netconf_dump_devconf, NULL);
5942 ipv6_addr_label_rtnl_register();
5946 rtnl_af_unregister(&inet6_ops);
5947 unregister_netdevice_notifier(&ipv6_dev_notf);
5949 destroy_workqueue(addrconf_wq);
5951 unregister_pernet_subsys(&addrconf_ops);
5953 ipv6_addr_label_cleanup();
5958 void addrconf_cleanup(void)
5960 struct net_device *dev;
5963 unregister_netdevice_notifier(&ipv6_dev_notf);
5964 unregister_pernet_subsys(&addrconf_ops);
5965 ipv6_addr_label_cleanup();
5969 __rtnl_af_unregister(&inet6_ops);
5971 /* clean dev list */
5972 for_each_netdev(&init_net, dev) {
5973 if (__in6_dev_get(dev) == NULL)
5975 addrconf_ifdown(dev, 1);
5977 addrconf_ifdown(init_net.loopback_dev, 2);
5982 spin_lock_bh(&addrconf_hash_lock);
5983 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5984 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5985 spin_unlock_bh(&addrconf_hash_lock);
5986 cancel_delayed_work(&addr_chk_work);
5989 destroy_workqueue(addrconf_wq);