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/in6.h>
50 #include <linux/netdevice.h>
51 #include <linux/if_addr.h>
52 #include <linux/if_arp.h>
53 #include <linux/if_arcnet.h>
54 #include <linux/if_infiniband.h>
55 #include <linux/route.h>
56 #include <linux/inetdevice.h>
57 #include <linux/init.h>
58 #include <linux/slab.h>
60 #include <linux/sysctl.h>
62 #include <linux/capability.h>
63 #include <linux/delay.h>
64 #include <linux/notifier.h>
65 #include <linux/string.h>
66 #include <linux/hash.h>
68 #include <net/net_namespace.h>
72 #include <net/af_ieee802154.h>
73 #include <net/firewire.h>
75 #include <net/protocol.h>
76 #include <net/ndisc.h>
77 #include <net/ip6_route.h>
78 #include <net/addrconf.h>
81 #include <net/netlink.h>
82 #include <net/pkt_sched.h>
83 #include <linux/if_tunnel.h>
84 #include <linux/rtnetlink.h>
85 #include <linux/netconf.h>
87 #ifdef CONFIG_IPV6_PRIVACY
88 #include <linux/random.h>
91 #include <linux/uaccess.h>
92 #include <asm/unaligned.h>
94 #include <linux/proc_fs.h>
95 #include <linux/seq_file.h>
96 #include <linux/export.h>
98 /* Set to 3 to get tracing... */
102 #define ADBG(x) printk x
107 #define INFINITY_LIFE_TIME 0xFFFFFFFF
109 static inline u32 cstamp_delta(unsigned long cstamp)
111 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
115 static void addrconf_sysctl_register(struct inet6_dev *idev);
116 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
118 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
122 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
127 #ifdef CONFIG_IPV6_PRIVACY
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);
133 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
134 static int ipv6_count_addresses(struct inet6_dev *idev);
137 * Configured unicast address hash table
139 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
140 static DEFINE_SPINLOCK(addrconf_hash_lock);
142 static void addrconf_verify(unsigned long);
144 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
145 static DEFINE_SPINLOCK(addrconf_verify_lock);
147 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
148 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
150 static void addrconf_type_change(struct net_device *dev,
151 unsigned long event);
152 static int addrconf_ifdown(struct net_device *dev, int how);
154 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
156 const struct net_device *dev,
157 u32 flags, u32 noflags);
159 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
160 static void addrconf_dad_timer(unsigned long data);
161 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
162 static void addrconf_dad_run(struct inet6_dev *idev);
163 static void addrconf_rs_timer(unsigned long data);
164 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
165 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
167 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
168 struct prefix_info *pinfo);
169 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
170 struct net_device *dev);
172 static struct ipv6_devconf ipv6_devconf __read_mostly = {
174 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
175 .mtu6 = IPV6_MIN_MTU,
177 .accept_redirects = 1,
179 .force_mld_version = 0,
181 .rtr_solicits = MAX_RTR_SOLICITATIONS,
182 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
183 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
184 #ifdef CONFIG_IPV6_PRIVACY
186 .temp_valid_lft = TEMP_VALID_LIFETIME,
187 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
188 .regen_max_retry = REGEN_MAX_RETRY,
189 .max_desync_factor = MAX_DESYNC_FACTOR,
191 .max_addresses = IPV6_MAX_ADDRESSES,
192 .accept_ra_defrtr = 1,
193 .accept_ra_pinfo = 1,
194 #ifdef CONFIG_IPV6_ROUTER_PREF
195 .accept_ra_rtr_pref = 1,
196 .rtr_probe_interval = 60 * HZ,
197 #ifdef CONFIG_IPV6_ROUTE_INFO
198 .accept_ra_rt_info_max_plen = 0,
202 .accept_source_route = 0, /* we do not accept RH0 by default. */
207 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
209 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
210 .mtu6 = IPV6_MIN_MTU,
212 .accept_redirects = 1,
215 .rtr_solicits = MAX_RTR_SOLICITATIONS,
216 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
217 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
218 #ifdef CONFIG_IPV6_PRIVACY
220 .temp_valid_lft = TEMP_VALID_LIFETIME,
221 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
222 .regen_max_retry = REGEN_MAX_RETRY,
223 .max_desync_factor = MAX_DESYNC_FACTOR,
225 .max_addresses = IPV6_MAX_ADDRESSES,
226 .accept_ra_defrtr = 1,
227 .accept_ra_pinfo = 1,
228 #ifdef CONFIG_IPV6_ROUTER_PREF
229 .accept_ra_rtr_pref = 1,
230 .rtr_probe_interval = 60 * HZ,
231 #ifdef CONFIG_IPV6_ROUTE_INFO
232 .accept_ra_rt_info_max_plen = 0,
236 .accept_source_route = 0, /* we do not accept RH0 by default. */
241 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
242 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
243 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
244 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
245 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
246 const struct in6_addr in6addr_interfacelocal_allnodes = IN6ADDR_INTERFACELOCAL_ALLNODES_INIT;
247 const struct in6_addr in6addr_interfacelocal_allrouters = IN6ADDR_INTERFACELOCAL_ALLROUTERS_INIT;
248 const struct in6_addr in6addr_sitelocal_allrouters = IN6ADDR_SITELOCAL_ALLROUTERS_INIT;
250 /* Check if a valid qdisc is available */
251 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
253 return !qdisc_tx_is_noop(dev);
256 static void addrconf_del_rs_timer(struct inet6_dev *idev)
258 if (del_timer(&idev->rs_timer))
262 static void addrconf_del_dad_timer(struct inet6_ifaddr *ifp)
264 if (del_timer(&ifp->dad_timer))
268 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
271 if (!timer_pending(&idev->rs_timer))
273 mod_timer(&idev->rs_timer, jiffies + when);
276 static void addrconf_mod_dad_timer(struct inet6_ifaddr *ifp,
279 if (!timer_pending(&ifp->dad_timer))
281 mod_timer(&ifp->dad_timer, jiffies + when);
284 static int snmp6_alloc_dev(struct inet6_dev *idev)
286 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
287 sizeof(struct ipstats_mib),
288 __alignof__(struct ipstats_mib)) < 0)
290 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
292 if (!idev->stats.icmpv6dev)
294 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
296 if (!idev->stats.icmpv6msgdev)
302 kfree(idev->stats.icmpv6dev);
304 snmp_mib_free((void __percpu **)idev->stats.ipv6);
309 static void snmp6_free_dev(struct inet6_dev *idev)
311 kfree(idev->stats.icmpv6msgdev);
312 kfree(idev->stats.icmpv6dev);
313 snmp_mib_free((void __percpu **)idev->stats.ipv6);
316 /* Nobody refers to this device, we may destroy it. */
318 void in6_dev_finish_destroy(struct inet6_dev *idev)
320 struct net_device *dev = idev->dev;
322 WARN_ON(!list_empty(&idev->addr_list));
323 WARN_ON(idev->mc_list != NULL);
324 WARN_ON(timer_pending(&idev->rs_timer));
326 #ifdef NET_REFCNT_DEBUG
327 pr_debug("%s: %s\n", __func__, dev ? dev->name : "NIL");
331 pr_warn("Freeing alive inet6 device %p\n", idev);
334 snmp6_free_dev(idev);
335 kfree_rcu(idev, rcu);
337 EXPORT_SYMBOL(in6_dev_finish_destroy);
339 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
341 struct inet6_dev *ndev;
345 if (dev->mtu < IPV6_MIN_MTU)
348 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
353 rwlock_init(&ndev->lock);
355 INIT_LIST_HEAD(&ndev->addr_list);
356 setup_timer(&ndev->rs_timer, addrconf_rs_timer,
357 (unsigned long)ndev);
358 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
359 ndev->cnf.mtu6 = dev->mtu;
360 ndev->cnf.sysctl = NULL;
361 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
362 if (ndev->nd_parms == NULL) {
366 if (ndev->cnf.forwarding)
367 dev_disable_lro(dev);
368 /* We refer to the device */
371 if (snmp6_alloc_dev(ndev) < 0) {
373 "%s: cannot allocate memory for statistics; dev=%s.\n",
374 __func__, dev->name));
375 neigh_parms_release(&nd_tbl, ndev->nd_parms);
381 if (snmp6_register_dev(ndev) < 0) {
383 "%s: cannot create /proc/net/dev_snmp6/%s\n",
384 __func__, dev->name));
385 neigh_parms_release(&nd_tbl, ndev->nd_parms);
387 in6_dev_finish_destroy(ndev);
391 /* One reference from device. We must do this before
392 * we invoke __ipv6_regen_rndid().
396 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
397 ndev->cnf.accept_dad = -1;
399 #if IS_ENABLED(CONFIG_IPV6_SIT)
400 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
401 pr_info("%s: Disabled Multicast RS\n", dev->name);
402 ndev->cnf.rtr_solicits = 0;
406 #ifdef CONFIG_IPV6_PRIVACY
407 INIT_LIST_HEAD(&ndev->tempaddr_list);
408 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
409 if ((dev->flags&IFF_LOOPBACK) ||
410 dev->type == ARPHRD_TUNNEL ||
411 dev->type == ARPHRD_TUNNEL6 ||
412 dev->type == ARPHRD_SIT ||
413 dev->type == ARPHRD_NONE) {
414 ndev->cnf.use_tempaddr = -1;
417 ipv6_regen_rndid((unsigned long) ndev);
420 ndev->token = in6addr_any;
422 if (netif_running(dev) && addrconf_qdisc_ok(dev))
423 ndev->if_flags |= IF_READY;
425 ipv6_mc_init_dev(ndev);
426 ndev->tstamp = jiffies;
427 addrconf_sysctl_register(ndev);
428 /* protected by rtnl_lock */
429 rcu_assign_pointer(dev->ip6_ptr, ndev);
431 /* Join interface-local all-node multicast group */
432 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
434 /* Join all-node multicast group */
435 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
437 /* Join all-router multicast group if forwarding is set */
438 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
439 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
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);
478 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
479 struct ipv6_devconf *devconf, u32 portid,
480 u32 seq, int event, unsigned int flags,
483 struct nlmsghdr *nlh;
484 struct netconfmsg *ncm;
486 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
491 ncm = nlmsg_data(nlh);
492 ncm->ncm_family = AF_INET6;
494 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
495 goto nla_put_failure;
497 /* type -1 is used for ALL */
498 if ((type == -1 || type == NETCONFA_FORWARDING) &&
499 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
500 goto nla_put_failure;
501 #ifdef CONFIG_IPV6_MROUTE
502 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
503 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
504 devconf->mc_forwarding) < 0)
505 goto nla_put_failure;
507 return nlmsg_end(skb, nlh);
510 nlmsg_cancel(skb, nlh);
514 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
515 struct ipv6_devconf *devconf)
520 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
524 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
525 RTM_NEWNETCONF, 0, type);
527 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
528 WARN_ON(err == -EMSGSIZE);
532 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
535 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
538 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
539 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
540 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
543 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
544 struct nlmsghdr *nlh)
546 struct net *net = sock_net(in_skb->sk);
547 struct nlattr *tb[NETCONFA_MAX+1];
548 struct netconfmsg *ncm;
550 struct ipv6_devconf *devconf;
551 struct inet6_dev *in6_dev;
552 struct net_device *dev;
556 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
557 devconf_ipv6_policy);
562 if (!tb[NETCONFA_IFINDEX])
565 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
567 case NETCONFA_IFINDEX_ALL:
568 devconf = net->ipv6.devconf_all;
570 case NETCONFA_IFINDEX_DEFAULT:
571 devconf = net->ipv6.devconf_dflt;
574 dev = __dev_get_by_index(net, ifindex);
577 in6_dev = __in6_dev_get(dev);
580 devconf = &in6_dev->cnf;
585 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
589 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
590 NETLINK_CB(in_skb).portid,
591 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
594 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
595 WARN_ON(err == -EMSGSIZE);
599 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
604 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
605 struct netlink_callback *cb)
607 struct net *net = sock_net(skb->sk);
610 struct net_device *dev;
611 struct inet6_dev *idev;
612 struct hlist_head *head;
615 s_idx = idx = cb->args[1];
617 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
619 head = &net->dev_index_head[h];
621 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
623 hlist_for_each_entry_rcu(dev, head, index_hlist) {
626 idev = __in6_dev_get(dev);
630 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
632 NETLINK_CB(cb->skb).portid,
640 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
646 if (h == NETDEV_HASHENTRIES) {
647 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
648 net->ipv6.devconf_all,
649 NETLINK_CB(cb->skb).portid,
651 RTM_NEWNETCONF, NLM_F_MULTI,
657 if (h == NETDEV_HASHENTRIES + 1) {
658 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
659 net->ipv6.devconf_dflt,
660 NETLINK_CB(cb->skb).portid,
662 RTM_NEWNETCONF, NLM_F_MULTI,
676 static void dev_forward_change(struct inet6_dev *idev)
678 struct net_device *dev;
679 struct inet6_ifaddr *ifa;
684 if (idev->cnf.forwarding)
685 dev_disable_lro(dev);
686 if (dev->flags & IFF_MULTICAST) {
687 if (idev->cnf.forwarding) {
688 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
689 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
690 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
692 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
693 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
694 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
698 list_for_each_entry(ifa, &idev->addr_list, if_list) {
699 if (ifa->flags&IFA_F_TENTATIVE)
701 if (idev->cnf.forwarding)
702 addrconf_join_anycast(ifa);
704 addrconf_leave_anycast(ifa);
706 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
707 dev->ifindex, &idev->cnf);
711 static void addrconf_forward_change(struct net *net, __s32 newf)
713 struct net_device *dev;
714 struct inet6_dev *idev;
716 for_each_netdev(net, dev) {
717 idev = __in6_dev_get(dev);
719 int changed = (!idev->cnf.forwarding) ^ (!newf);
720 idev->cnf.forwarding = newf;
722 dev_forward_change(idev);
727 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
733 return restart_syscall();
735 net = (struct net *)table->extra2;
739 if (p == &net->ipv6.devconf_dflt->forwarding) {
740 if ((!newf) ^ (!old))
741 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
742 NETCONFA_IFINDEX_DEFAULT,
743 net->ipv6.devconf_dflt);
748 if (p == &net->ipv6.devconf_all->forwarding) {
749 net->ipv6.devconf_dflt->forwarding = newf;
750 addrconf_forward_change(net, newf);
751 if ((!newf) ^ (!old))
752 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
753 NETCONFA_IFINDEX_ALL,
754 net->ipv6.devconf_all);
755 } else if ((!newf) ^ (!old))
756 dev_forward_change((struct inet6_dev *)table->extra1);
760 rt6_purge_dflt_routers(net);
765 /* Nobody refers to this ifaddr, destroy it */
766 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
768 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
770 #ifdef NET_REFCNT_DEBUG
771 pr_debug("%s\n", __func__);
774 in6_dev_put(ifp->idev);
776 if (del_timer(&ifp->dad_timer))
777 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
779 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
780 pr_warn("Freeing alive inet6 address %p\n", ifp);
789 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
792 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
795 * Each device address list is sorted in order of scope -
796 * global before linklocal.
798 list_for_each(p, &idev->addr_list) {
799 struct inet6_ifaddr *ifa
800 = list_entry(p, struct inet6_ifaddr, if_list);
801 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
805 list_add_tail(&ifp->if_list, p);
808 static u32 inet6_addr_hash(const struct in6_addr *addr)
810 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
813 /* On success it returns ifp with increased reference count */
815 static struct inet6_ifaddr *
816 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
817 int scope, u32 flags)
819 struct inet6_ifaddr *ifa = NULL;
823 int addr_type = ipv6_addr_type(addr);
825 if (addr_type == IPV6_ADDR_ANY ||
826 addr_type & IPV6_ADDR_MULTICAST ||
827 (!(idev->dev->flags & IFF_LOOPBACK) &&
828 addr_type & IPV6_ADDR_LOOPBACK))
829 return ERR_PTR(-EADDRNOTAVAIL);
833 err = -ENODEV; /*XXX*/
837 if (idev->cnf.disable_ipv6) {
842 spin_lock(&addrconf_hash_lock);
844 /* Ignore adding duplicate addresses on an interface */
845 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
846 ADBG(("ipv6_add_addr: already assigned\n"));
851 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
854 ADBG(("ipv6_add_addr: malloc failed\n"));
859 rt = addrconf_dst_alloc(idev, addr, false);
867 spin_lock_init(&ifa->lock);
868 spin_lock_init(&ifa->state_lock);
869 setup_timer(&ifa->dad_timer, addrconf_dad_timer,
871 INIT_HLIST_NODE(&ifa->addr_lst);
873 ifa->prefix_len = pfxlen;
874 ifa->flags = flags | IFA_F_TENTATIVE;
875 ifa->cstamp = ifa->tstamp = jiffies;
876 ifa->tokenized = false;
885 /* Add to big hash table */
886 hash = inet6_addr_hash(addr);
888 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
889 spin_unlock(&addrconf_hash_lock);
891 write_lock(&idev->lock);
892 /* Add to inet6_dev unicast addr list. */
893 ipv6_link_dev_addr(idev, ifa);
895 #ifdef CONFIG_IPV6_PRIVACY
896 if (ifa->flags&IFA_F_TEMPORARY) {
897 list_add(&ifa->tmp_list, &idev->tempaddr_list);
903 write_unlock(&idev->lock);
905 rcu_read_unlock_bh();
907 if (likely(err == 0))
908 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
916 spin_unlock(&addrconf_hash_lock);
920 /* This function wants to get referenced ifp and releases it before return */
922 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
924 struct inet6_ifaddr *ifa, *ifn;
925 struct inet6_dev *idev = ifp->idev;
927 int deleted = 0, onlink = 0;
928 unsigned long expires = jiffies;
930 spin_lock_bh(&ifp->state_lock);
932 ifp->state = INET6_IFADDR_STATE_DEAD;
933 spin_unlock_bh(&ifp->state_lock);
935 if (state == INET6_IFADDR_STATE_DEAD)
938 spin_lock_bh(&addrconf_hash_lock);
939 hlist_del_init_rcu(&ifp->addr_lst);
940 spin_unlock_bh(&addrconf_hash_lock);
942 write_lock_bh(&idev->lock);
943 #ifdef CONFIG_IPV6_PRIVACY
944 if (ifp->flags&IFA_F_TEMPORARY) {
945 list_del(&ifp->tmp_list);
947 in6_ifa_put(ifp->ifpub);
954 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
956 list_del_init(&ifp->if_list);
959 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
963 } else if (ifp->flags & IFA_F_PERMANENT) {
964 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
966 if (ifa->flags & IFA_F_PERMANENT) {
971 unsigned long lifetime;
976 spin_lock(&ifa->lock);
978 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
980 * Note: Because this address is
981 * not permanent, lifetime <
982 * LONG_MAX / HZ here.
984 if (time_before(expires,
985 ifa->tstamp + lifetime * HZ))
986 expires = ifa->tstamp + lifetime * HZ;
987 spin_unlock(&ifa->lock);
992 write_unlock_bh(&idev->lock);
994 addrconf_del_dad_timer(ifp);
996 ipv6_ifa_notify(RTM_DELADDR, ifp);
998 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1001 * Purge or update corresponding prefix
1003 * 1) we don't purge prefix here if address was not permanent.
1004 * prefix is managed by its own lifetime.
1005 * 2) if there're no addresses, delete prefix.
1006 * 3) if there're still other permanent address(es),
1007 * corresponding prefix is still permanent.
1008 * 4) otherwise, update prefix lifetime to the
1009 * longest valid lifetime among the corresponding
1010 * addresses on the device.
1011 * Note: subsequent RA will update lifetime.
1015 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
1016 struct in6_addr prefix;
1017 struct rt6_info *rt;
1019 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
1021 rt = addrconf_get_prefix_route(&prefix,
1024 0, RTF_GATEWAY | RTF_DEFAULT);
1030 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
1031 rt6_set_expires(rt, expires);
1037 /* clean up prefsrc entries */
1038 rt6_remove_prefsrc(ifp);
1043 #ifdef CONFIG_IPV6_PRIVACY
1044 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1046 struct inet6_dev *idev = ifp->idev;
1047 struct in6_addr addr, *tmpaddr;
1048 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1049 unsigned long regen_advance;
1054 unsigned long now = jiffies;
1056 write_lock(&idev->lock);
1058 spin_lock_bh(&ift->lock);
1059 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1060 spin_unlock_bh(&ift->lock);
1067 if (idev->cnf.use_tempaddr <= 0) {
1068 write_unlock(&idev->lock);
1069 pr_info("%s: use_tempaddr is disabled\n", __func__);
1074 spin_lock_bh(&ifp->lock);
1075 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1076 idev->cnf.use_tempaddr = -1; /*XXX*/
1077 spin_unlock_bh(&ifp->lock);
1078 write_unlock(&idev->lock);
1079 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1086 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1087 __ipv6_try_regen_rndid(idev, tmpaddr);
1088 memcpy(&addr.s6_addr[8], idev->rndid, 8);
1089 age = (now - ifp->tstamp) / HZ;
1090 tmp_valid_lft = min_t(__u32,
1092 idev->cnf.temp_valid_lft + age);
1093 tmp_prefered_lft = min_t(__u32,
1095 idev->cnf.temp_prefered_lft + age -
1096 idev->cnf.max_desync_factor);
1097 tmp_plen = ifp->prefix_len;
1098 max_addresses = idev->cnf.max_addresses;
1099 tmp_tstamp = ifp->tstamp;
1100 spin_unlock_bh(&ifp->lock);
1102 regen_advance = idev->cnf.regen_max_retry *
1103 idev->cnf.dad_transmits *
1104 idev->nd_parms->retrans_time / HZ;
1105 write_unlock(&idev->lock);
1107 /* A temporary address is created only if this calculated Preferred
1108 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1109 * an implementation must not create a temporary address with a zero
1110 * Preferred Lifetime.
1112 if (tmp_prefered_lft <= regen_advance) {
1119 addr_flags = IFA_F_TEMPORARY;
1120 /* set in addrconf_prefix_rcv() */
1121 if (ifp->flags & IFA_F_OPTIMISTIC)
1122 addr_flags |= IFA_F_OPTIMISTIC;
1124 ift = !max_addresses ||
1125 ipv6_count_addresses(idev) < max_addresses ?
1126 ipv6_add_addr(idev, &addr, tmp_plen, ipv6_addr_scope(&addr),
1128 if (IS_ERR_OR_NULL(ift)) {
1131 pr_info("%s: retry temporary address regeneration\n", __func__);
1133 write_lock(&idev->lock);
1137 spin_lock_bh(&ift->lock);
1139 ift->valid_lft = tmp_valid_lft;
1140 ift->prefered_lft = tmp_prefered_lft;
1142 ift->tstamp = tmp_tstamp;
1143 spin_unlock_bh(&ift->lock);
1145 addrconf_dad_start(ift);
1154 * Choose an appropriate source address (RFC3484)
1157 IPV6_SADDR_RULE_INIT = 0,
1158 IPV6_SADDR_RULE_LOCAL,
1159 IPV6_SADDR_RULE_SCOPE,
1160 IPV6_SADDR_RULE_PREFERRED,
1161 #ifdef CONFIG_IPV6_MIP6
1162 IPV6_SADDR_RULE_HOA,
1164 IPV6_SADDR_RULE_OIF,
1165 IPV6_SADDR_RULE_LABEL,
1166 #ifdef CONFIG_IPV6_PRIVACY
1167 IPV6_SADDR_RULE_PRIVACY,
1169 IPV6_SADDR_RULE_ORCHID,
1170 IPV6_SADDR_RULE_PREFIX,
1174 struct ipv6_saddr_score {
1177 struct inet6_ifaddr *ifa;
1178 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1183 struct ipv6_saddr_dst {
1184 const struct in6_addr *addr;
1191 static inline int ipv6_saddr_preferred(int type)
1193 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1198 static int ipv6_get_saddr_eval(struct net *net,
1199 struct ipv6_saddr_score *score,
1200 struct ipv6_saddr_dst *dst,
1205 if (i <= score->rule) {
1207 case IPV6_SADDR_RULE_SCOPE:
1208 ret = score->scopedist;
1210 case IPV6_SADDR_RULE_PREFIX:
1211 ret = score->matchlen;
1214 ret = !!test_bit(i, score->scorebits);
1220 case IPV6_SADDR_RULE_INIT:
1221 /* Rule 0: remember if hiscore is not ready yet */
1224 case IPV6_SADDR_RULE_LOCAL:
1225 /* Rule 1: Prefer same address */
1226 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1228 case IPV6_SADDR_RULE_SCOPE:
1229 /* Rule 2: Prefer appropriate scope
1234 * ---+--+-+---> scope
1236 * | d is scope of the destination.
1238 * | \ <- smaller scope is better if
1239 * B-15 | \ if scope is enough for destinaion.
1240 * | ret = B - scope (-1 <= scope >= d <= 15).
1242 * |/ <- greater is better
1243 * -C / if scope is not enough for destination.
1244 * /| ret = scope - C (-1 <= d < scope <= 15).
1246 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1247 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1248 * Assume B = 0 and we get C > 29.
1250 ret = __ipv6_addr_src_scope(score->addr_type);
1251 if (ret >= dst->scope)
1254 ret -= 128; /* 30 is enough */
1255 score->scopedist = ret;
1257 case IPV6_SADDR_RULE_PREFERRED:
1258 /* Rule 3: Avoid deprecated and optimistic addresses */
1259 ret = ipv6_saddr_preferred(score->addr_type) ||
1260 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1262 #ifdef CONFIG_IPV6_MIP6
1263 case IPV6_SADDR_RULE_HOA:
1265 /* Rule 4: Prefer home address */
1266 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1267 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1271 case IPV6_SADDR_RULE_OIF:
1272 /* Rule 5: Prefer outgoing interface */
1273 ret = (!dst->ifindex ||
1274 dst->ifindex == score->ifa->idev->dev->ifindex);
1276 case IPV6_SADDR_RULE_LABEL:
1277 /* Rule 6: Prefer matching label */
1278 ret = ipv6_addr_label(net,
1279 &score->ifa->addr, score->addr_type,
1280 score->ifa->idev->dev->ifindex) == dst->label;
1282 #ifdef CONFIG_IPV6_PRIVACY
1283 case IPV6_SADDR_RULE_PRIVACY:
1285 /* Rule 7: Prefer public address
1286 * Note: prefer temporary address if use_tempaddr >= 2
1288 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1289 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1290 score->ifa->idev->cnf.use_tempaddr >= 2;
1291 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1295 case IPV6_SADDR_RULE_ORCHID:
1296 /* Rule 8-: Prefer ORCHID vs ORCHID or
1297 * non-ORCHID vs non-ORCHID
1299 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1300 ipv6_addr_orchid(dst->addr));
1302 case IPV6_SADDR_RULE_PREFIX:
1303 /* Rule 8: Use longest matching prefix */
1304 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1305 if (ret > score->ifa->prefix_len)
1306 ret = score->ifa->prefix_len;
1307 score->matchlen = ret;
1314 __set_bit(i, score->scorebits);
1320 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1321 const struct in6_addr *daddr, unsigned int prefs,
1322 struct in6_addr *saddr)
1324 struct ipv6_saddr_score scores[2],
1325 *score = &scores[0], *hiscore = &scores[1];
1326 struct ipv6_saddr_dst dst;
1327 struct net_device *dev;
1330 dst_type = __ipv6_addr_type(daddr);
1332 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1333 dst.scope = __ipv6_addr_src_scope(dst_type);
1334 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1338 hiscore->ifa = NULL;
1342 for_each_netdev_rcu(net, dev) {
1343 struct inet6_dev *idev;
1345 /* Candidate Source Address (section 4)
1346 * - multicast and link-local destination address,
1347 * the set of candidate source address MUST only
1348 * include addresses assigned to interfaces
1349 * belonging to the same link as the outgoing
1351 * (- For site-local destination addresses, the
1352 * set of candidate source addresses MUST only
1353 * include addresses assigned to interfaces
1354 * belonging to the same site as the outgoing
1357 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1358 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1359 dst.ifindex && dev->ifindex != dst.ifindex)
1362 idev = __in6_dev_get(dev);
1366 read_lock_bh(&idev->lock);
1367 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1371 * - Tentative Address (RFC2462 section 5.4)
1372 * - A tentative address is not considered
1373 * "assigned to an interface" in the traditional
1374 * sense, unless it is also flagged as optimistic.
1375 * - Candidate Source Address (section 4)
1376 * - In any case, anycast addresses, multicast
1377 * addresses, and the unspecified address MUST
1378 * NOT be included in a candidate set.
1380 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1381 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1384 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1386 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1387 score->addr_type & IPV6_ADDR_MULTICAST)) {
1388 LIMIT_NETDEBUG(KERN_DEBUG
1389 "ADDRCONF: unspecified / multicast address "
1390 "assigned as unicast address on %s",
1396 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1398 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1399 int minihiscore, miniscore;
1401 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1402 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1404 if (minihiscore > miniscore) {
1405 if (i == IPV6_SADDR_RULE_SCOPE &&
1406 score->scopedist > 0) {
1409 * each remaining entry
1410 * has too small (not enough)
1411 * scope, because ifa entries
1412 * are sorted by their scope
1418 } else if (minihiscore < miniscore) {
1420 in6_ifa_put(hiscore->ifa);
1422 in6_ifa_hold(score->ifa);
1424 swap(hiscore, score);
1426 /* restore our iterator */
1427 score->ifa = hiscore->ifa;
1434 read_unlock_bh(&idev->lock);
1439 return -EADDRNOTAVAIL;
1441 *saddr = hiscore->ifa->addr;
1442 in6_ifa_put(hiscore->ifa);
1445 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1447 static int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1448 unsigned char banned_flags)
1450 struct inet6_ifaddr *ifp;
1451 int err = -EADDRNOTAVAIL;
1453 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1454 if (ifp->scope == IFA_LINK &&
1455 !(ifp->flags & banned_flags)) {
1464 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1465 unsigned char banned_flags)
1467 struct inet6_dev *idev;
1468 int err = -EADDRNOTAVAIL;
1471 idev = __in6_dev_get(dev);
1473 read_lock_bh(&idev->lock);
1474 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1475 read_unlock_bh(&idev->lock);
1481 static int ipv6_count_addresses(struct inet6_dev *idev)
1484 struct inet6_ifaddr *ifp;
1486 read_lock_bh(&idev->lock);
1487 list_for_each_entry(ifp, &idev->addr_list, if_list)
1489 read_unlock_bh(&idev->lock);
1493 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1494 const struct net_device *dev, int strict)
1496 struct inet6_ifaddr *ifp;
1497 unsigned int hash = inet6_addr_hash(addr);
1500 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1501 if (!net_eq(dev_net(ifp->idev->dev), net))
1503 if (ipv6_addr_equal(&ifp->addr, addr) &&
1504 !(ifp->flags&IFA_F_TENTATIVE) &&
1505 (dev == NULL || ifp->idev->dev == dev ||
1506 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1507 rcu_read_unlock_bh();
1512 rcu_read_unlock_bh();
1515 EXPORT_SYMBOL(ipv6_chk_addr);
1517 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1518 struct net_device *dev)
1520 unsigned int hash = inet6_addr_hash(addr);
1521 struct inet6_ifaddr *ifp;
1523 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1524 if (!net_eq(dev_net(ifp->idev->dev), net))
1526 if (ipv6_addr_equal(&ifp->addr, addr)) {
1527 if (dev == NULL || ifp->idev->dev == dev)
1534 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1536 struct inet6_dev *idev;
1537 struct inet6_ifaddr *ifa;
1542 idev = __in6_dev_get(dev);
1544 read_lock_bh(&idev->lock);
1545 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1546 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1551 read_unlock_bh(&idev->lock);
1556 EXPORT_SYMBOL(ipv6_chk_prefix);
1558 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1559 struct net_device *dev, int strict)
1561 struct inet6_ifaddr *ifp, *result = NULL;
1562 unsigned int hash = inet6_addr_hash(addr);
1565 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1566 if (!net_eq(dev_net(ifp->idev->dev), net))
1568 if (ipv6_addr_equal(&ifp->addr, addr)) {
1569 if (dev == NULL || ifp->idev->dev == dev ||
1570 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1577 rcu_read_unlock_bh();
1582 /* Gets referenced address, destroys ifaddr */
1584 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1586 if (ifp->flags&IFA_F_PERMANENT) {
1587 spin_lock_bh(&ifp->lock);
1588 addrconf_del_dad_timer(ifp);
1589 ifp->flags |= IFA_F_TENTATIVE;
1591 ifp->flags |= IFA_F_DADFAILED;
1592 spin_unlock_bh(&ifp->lock);
1594 ipv6_ifa_notify(0, ifp);
1596 #ifdef CONFIG_IPV6_PRIVACY
1597 } else if (ifp->flags&IFA_F_TEMPORARY) {
1598 struct inet6_ifaddr *ifpub;
1599 spin_lock_bh(&ifp->lock);
1602 in6_ifa_hold(ifpub);
1603 spin_unlock_bh(&ifp->lock);
1604 ipv6_create_tempaddr(ifpub, ifp);
1607 spin_unlock_bh(&ifp->lock);
1615 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1619 spin_lock(&ifp->state_lock);
1620 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1621 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1624 spin_unlock(&ifp->state_lock);
1629 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1631 struct inet6_dev *idev = ifp->idev;
1633 if (addrconf_dad_end(ifp)) {
1638 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1639 ifp->idev->dev->name, &ifp->addr);
1641 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1642 struct in6_addr addr;
1644 addr.s6_addr32[0] = htonl(0xfe800000);
1645 addr.s6_addr32[1] = 0;
1647 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1648 ipv6_addr_equal(&ifp->addr, &addr)) {
1649 /* DAD failed for link-local based on MAC address */
1650 idev->cnf.disable_ipv6 = 1;
1652 pr_info("%s: IPv6 being disabled!\n",
1653 ifp->idev->dev->name);
1657 addrconf_dad_stop(ifp, 1);
1660 /* Join to solicited addr multicast group. */
1662 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1664 struct in6_addr maddr;
1666 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1669 addrconf_addr_solict_mult(addr, &maddr);
1670 ipv6_dev_mc_inc(dev, &maddr);
1673 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1675 struct in6_addr maddr;
1677 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1680 addrconf_addr_solict_mult(addr, &maddr);
1681 __ipv6_dev_mc_dec(idev, &maddr);
1684 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1686 struct in6_addr addr;
1687 if (ifp->prefix_len == 127) /* RFC 6164 */
1689 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1690 if (ipv6_addr_any(&addr))
1692 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1695 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1697 struct in6_addr addr;
1698 if (ifp->prefix_len == 127) /* RFC 6164 */
1700 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1701 if (ipv6_addr_any(&addr))
1703 __ipv6_dev_ac_dec(ifp->idev, &addr);
1706 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1708 if (dev->addr_len != ETH_ALEN)
1710 memcpy(eui, dev->dev_addr, 3);
1711 memcpy(eui + 5, dev->dev_addr + 3, 3);
1714 * The zSeries OSA network cards can be shared among various
1715 * OS instances, but the OSA cards have only one MAC address.
1716 * This leads to duplicate address conflicts in conjunction
1717 * with IPv6 if more than one instance uses the same card.
1719 * The driver for these cards can deliver a unique 16-bit
1720 * identifier for each instance sharing the same card. It is
1721 * placed instead of 0xFFFE in the interface identifier. The
1722 * "u" bit of the interface identifier is not inverted in this
1723 * case. Hence the resulting interface identifier has local
1724 * scope according to RFC2373.
1727 eui[3] = (dev->dev_id >> 8) & 0xFF;
1728 eui[4] = dev->dev_id & 0xFF;
1737 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1739 if (dev->addr_len != IEEE802154_ADDR_LEN)
1741 memcpy(eui, dev->dev_addr, 8);
1746 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1748 union fwnet_hwaddr *ha;
1750 if (dev->addr_len != FWNET_ALEN)
1753 ha = (union fwnet_hwaddr *)dev->dev_addr;
1755 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1760 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1762 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1763 if (dev->addr_len != ARCNET_ALEN)
1766 eui[7] = *(u8 *)dev->dev_addr;
1770 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1772 if (dev->addr_len != INFINIBAND_ALEN)
1774 memcpy(eui, dev->dev_addr + 12, 8);
1779 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1783 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1784 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1785 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1786 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1787 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1788 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1792 memcpy(eui + 4, &addr, 4);
1796 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1798 if (dev->priv_flags & IFF_ISATAP)
1799 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1803 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1805 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1808 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1810 switch (dev->type) {
1813 return addrconf_ifid_eui48(eui, dev);
1815 return addrconf_ifid_arcnet(eui, dev);
1816 case ARPHRD_INFINIBAND:
1817 return addrconf_ifid_infiniband(eui, dev);
1819 return addrconf_ifid_sit(eui, dev);
1821 return addrconf_ifid_gre(eui, dev);
1822 case ARPHRD_IEEE802154:
1823 return addrconf_ifid_eui64(eui, dev);
1824 case ARPHRD_IEEE1394:
1825 return addrconf_ifid_ieee1394(eui, dev);
1830 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1833 struct inet6_ifaddr *ifp;
1835 read_lock_bh(&idev->lock);
1836 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1837 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1838 memcpy(eui, ifp->addr.s6_addr+8, 8);
1843 read_unlock_bh(&idev->lock);
1847 #ifdef CONFIG_IPV6_PRIVACY
1848 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1849 static void __ipv6_regen_rndid(struct inet6_dev *idev)
1852 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1853 idev->rndid[0] &= ~0x02;
1856 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1857 * check if generated address is not inappropriate
1859 * - Reserved subnet anycast (RFC 2526)
1860 * 11111101 11....11 1xxxxxxx
1861 * - ISATAP (RFC4214) 6.1
1862 * 00-00-5E-FE-xx-xx-xx-xx
1864 * - XXX: already assigned to an address on the device
1866 if (idev->rndid[0] == 0xfd &&
1867 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1868 (idev->rndid[7]&0x80))
1870 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1871 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1873 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1878 static void ipv6_regen_rndid(unsigned long data)
1880 struct inet6_dev *idev = (struct inet6_dev *) data;
1881 unsigned long expires;
1884 write_lock_bh(&idev->lock);
1889 __ipv6_regen_rndid(idev);
1892 idev->cnf.temp_prefered_lft * HZ -
1893 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1894 idev->cnf.max_desync_factor * HZ;
1895 if (time_before(expires, jiffies)) {
1896 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
1897 __func__, idev->dev->name);
1901 if (!mod_timer(&idev->regen_timer, expires))
1905 write_unlock_bh(&idev->lock);
1906 rcu_read_unlock_bh();
1910 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
1912 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1913 __ipv6_regen_rndid(idev);
1922 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1923 unsigned long expires, u32 flags)
1925 struct fib6_config cfg = {
1926 .fc_table = RT6_TABLE_PREFIX,
1927 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1928 .fc_ifindex = dev->ifindex,
1929 .fc_expires = expires,
1931 .fc_flags = RTF_UP | flags,
1932 .fc_nlinfo.nl_net = dev_net(dev),
1933 .fc_protocol = RTPROT_KERNEL,
1938 /* Prevent useless cloning on PtP SIT.
1939 This thing is done here expecting that the whole
1940 class of non-broadcast devices need not cloning.
1942 #if IS_ENABLED(CONFIG_IPV6_SIT)
1943 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1944 cfg.fc_flags |= RTF_NONEXTHOP;
1947 ip6_route_add(&cfg);
1951 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
1953 const struct net_device *dev,
1954 u32 flags, u32 noflags)
1956 struct fib6_node *fn;
1957 struct rt6_info *rt = NULL;
1958 struct fib6_table *table;
1960 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
1964 read_lock_bh(&table->tb6_lock);
1965 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
1968 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1969 if (rt->dst.dev->ifindex != dev->ifindex)
1971 if ((rt->rt6i_flags & flags) != flags)
1973 if ((rt->rt6i_flags & noflags) != 0)
1979 read_unlock_bh(&table->tb6_lock);
1984 /* Create "default" multicast route to the interface */
1986 static void addrconf_add_mroute(struct net_device *dev)
1988 struct fib6_config cfg = {
1989 .fc_table = RT6_TABLE_LOCAL,
1990 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1991 .fc_ifindex = dev->ifindex,
1994 .fc_nlinfo.nl_net = dev_net(dev),
1997 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1999 ip6_route_add(&cfg);
2002 #if IS_ENABLED(CONFIG_IPV6_SIT)
2003 static void sit_route_add(struct net_device *dev)
2005 struct fib6_config cfg = {
2006 .fc_table = RT6_TABLE_MAIN,
2007 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2008 .fc_ifindex = dev->ifindex,
2010 .fc_flags = RTF_UP | RTF_NONEXTHOP,
2011 .fc_nlinfo.nl_net = dev_net(dev),
2014 /* prefix length - 96 bits "::d.d.d.d" */
2015 ip6_route_add(&cfg);
2019 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2021 struct inet6_dev *idev;
2025 idev = ipv6_find_idev(dev);
2027 return ERR_PTR(-ENOBUFS);
2029 if (idev->cnf.disable_ipv6)
2030 return ERR_PTR(-EACCES);
2032 /* Add default multicast route */
2033 if (!(dev->flags & IFF_LOOPBACK))
2034 addrconf_add_mroute(dev);
2039 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2041 struct prefix_info *pinfo;
2045 struct inet6_dev *in6_dev;
2046 struct net *net = dev_net(dev);
2048 pinfo = (struct prefix_info *) opt;
2050 if (len < sizeof(struct prefix_info)) {
2051 ADBG(("addrconf: prefix option too short\n"));
2056 * Validation checks ([ADDRCONF], page 19)
2059 addr_type = ipv6_addr_type(&pinfo->prefix);
2061 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2064 valid_lft = ntohl(pinfo->valid);
2065 prefered_lft = ntohl(pinfo->prefered);
2067 if (prefered_lft > valid_lft) {
2068 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2072 in6_dev = in6_dev_get(dev);
2074 if (in6_dev == NULL) {
2075 net_dbg_ratelimited("addrconf: device %s not configured\n",
2081 * Two things going on here:
2082 * 1) Add routes for on-link prefixes
2083 * 2) Configure prefixes with the auto flag set
2086 if (pinfo->onlink) {
2087 struct rt6_info *rt;
2088 unsigned long rt_expires;
2090 /* Avoid arithmetic overflow. Really, we could
2091 * save rt_expires in seconds, likely valid_lft,
2092 * but it would require division in fib gc, that it
2096 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2098 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2100 if (addrconf_finite_timeout(rt_expires))
2103 rt = addrconf_get_prefix_route(&pinfo->prefix,
2106 RTF_ADDRCONF | RTF_PREFIX_RT,
2107 RTF_GATEWAY | RTF_DEFAULT);
2110 /* Autoconf prefix route */
2111 if (valid_lft == 0) {
2114 } else if (addrconf_finite_timeout(rt_expires)) {
2116 rt6_set_expires(rt, jiffies + rt_expires);
2118 rt6_clean_expires(rt);
2120 } else if (valid_lft) {
2121 clock_t expires = 0;
2122 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2123 if (addrconf_finite_timeout(rt_expires)) {
2125 flags |= RTF_EXPIRES;
2126 expires = jiffies_to_clock_t(rt_expires);
2128 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2129 dev, expires, flags);
2134 /* Try to figure out our local address for this prefix */
2136 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2137 struct inet6_ifaddr *ifp;
2138 struct in6_addr addr;
2139 int create = 0, update_lft = 0;
2140 bool tokenized = false;
2142 if (pinfo->prefix_len == 64) {
2143 memcpy(&addr, &pinfo->prefix, 8);
2145 if (!ipv6_addr_any(&in6_dev->token)) {
2146 read_lock_bh(&in6_dev->lock);
2147 memcpy(addr.s6_addr + 8,
2148 in6_dev->token.s6_addr + 8, 8);
2149 read_unlock_bh(&in6_dev->lock);
2151 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2152 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2153 in6_dev_put(in6_dev);
2158 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2160 in6_dev_put(in6_dev);
2165 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
2167 if (ifp == NULL && valid_lft) {
2168 int max_addresses = in6_dev->cnf.max_addresses;
2171 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2172 if (in6_dev->cnf.optimistic_dad &&
2173 !net->ipv6.devconf_all->forwarding && sllao)
2174 addr_flags = IFA_F_OPTIMISTIC;
2177 /* Do not allow to create too much of autoconfigured
2178 * addresses; this would be too easy way to crash kernel.
2180 if (!max_addresses ||
2181 ipv6_count_addresses(in6_dev) < max_addresses)
2182 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
2183 addr_type&IPV6_ADDR_SCOPE_MASK,
2186 if (IS_ERR_OR_NULL(ifp)) {
2187 in6_dev_put(in6_dev);
2191 update_lft = create = 1;
2192 ifp->cstamp = jiffies;
2193 ifp->tokenized = tokenized;
2194 addrconf_dad_start(ifp);
2200 #ifdef CONFIG_IPV6_PRIVACY
2201 struct inet6_ifaddr *ift;
2205 /* update lifetime (RFC2462 5.5.3 e) */
2206 spin_lock(&ifp->lock);
2208 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2209 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2212 if (!update_lft && stored_lft) {
2213 if (valid_lft > MIN_VALID_LIFETIME ||
2214 valid_lft > stored_lft)
2216 else if (stored_lft <= MIN_VALID_LIFETIME) {
2217 /* valid_lft <= stored_lft is always true */
2219 * RFC 4862 Section 5.5.3e:
2220 * "Note that the preferred lifetime of
2221 * the corresponding address is always
2222 * reset to the Preferred Lifetime in
2223 * the received Prefix Information
2224 * option, regardless of whether the
2225 * valid lifetime is also reset or
2228 * So if the preferred lifetime in
2229 * this advertisement is different
2230 * than what we have stored, but the
2231 * valid lifetime is invalid, just
2232 * reset prefered_lft.
2234 * We must set the valid lifetime
2235 * to the stored lifetime since we'll
2236 * be updating the timestamp below,
2237 * else we'll set it back to the
2240 if (prefered_lft != ifp->prefered_lft) {
2241 valid_lft = stored_lft;
2245 valid_lft = MIN_VALID_LIFETIME;
2246 if (valid_lft < prefered_lft)
2247 prefered_lft = valid_lft;
2253 ifp->valid_lft = valid_lft;
2254 ifp->prefered_lft = prefered_lft;
2257 ifp->flags &= ~IFA_F_DEPRECATED;
2258 spin_unlock(&ifp->lock);
2260 if (!(flags&IFA_F_TENTATIVE))
2261 ipv6_ifa_notify(0, ifp);
2263 spin_unlock(&ifp->lock);
2265 #ifdef CONFIG_IPV6_PRIVACY
2266 read_lock_bh(&in6_dev->lock);
2267 /* update all temporary addresses in the list */
2268 list_for_each_entry(ift, &in6_dev->tempaddr_list,
2270 int age, max_valid, max_prefered;
2272 if (ifp != ift->ifpub)
2276 * RFC 4941 section 3.3:
2277 * If a received option will extend the lifetime
2278 * of a public address, the lifetimes of
2279 * temporary addresses should be extended,
2280 * subject to the overall constraint that no
2281 * temporary addresses should ever remain
2282 * "valid" or "preferred" for a time longer than
2283 * (TEMP_VALID_LIFETIME) or
2284 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR),
2287 age = (now - ift->cstamp) / HZ;
2288 max_valid = in6_dev->cnf.temp_valid_lft - age;
2292 max_prefered = in6_dev->cnf.temp_prefered_lft -
2293 in6_dev->cnf.max_desync_factor -
2295 if (max_prefered < 0)
2298 if (valid_lft > max_valid)
2299 valid_lft = max_valid;
2301 if (prefered_lft > max_prefered)
2302 prefered_lft = max_prefered;
2304 spin_lock(&ift->lock);
2306 ift->valid_lft = valid_lft;
2307 ift->prefered_lft = prefered_lft;
2309 if (prefered_lft > 0)
2310 ift->flags &= ~IFA_F_DEPRECATED;
2312 spin_unlock(&ift->lock);
2313 if (!(flags&IFA_F_TENTATIVE))
2314 ipv6_ifa_notify(0, ift);
2317 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
2319 * When a new public address is created as
2320 * described in [ADDRCONF], also create a new
2321 * temporary address. Also create a temporary
2322 * address if it's enabled but no temporary
2323 * address currently exists.
2325 read_unlock_bh(&in6_dev->lock);
2326 ipv6_create_tempaddr(ifp, NULL);
2328 read_unlock_bh(&in6_dev->lock);
2335 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2336 in6_dev_put(in6_dev);
2340 * Set destination address.
2341 * Special case for SIT interfaces where we create a new "virtual"
2344 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2346 struct in6_ifreq ireq;
2347 struct net_device *dev;
2353 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2356 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2362 #if IS_ENABLED(CONFIG_IPV6_SIT)
2363 if (dev->type == ARPHRD_SIT) {
2364 const struct net_device_ops *ops = dev->netdev_ops;
2366 struct ip_tunnel_parm p;
2368 err = -EADDRNOTAVAIL;
2369 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2372 memset(&p, 0, sizeof(p));
2373 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2377 p.iph.protocol = IPPROTO_IPV6;
2379 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2381 if (ops->ndo_do_ioctl) {
2382 mm_segment_t oldfs = get_fs();
2385 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2392 dev = __dev_get_by_name(net, p.name);
2395 err = dev_open(dev);
2406 * Manual configuration of address on an interface
2408 static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx,
2409 const struct in6_addr *peer_pfx,
2410 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2413 struct inet6_ifaddr *ifp;
2414 struct inet6_dev *idev;
2415 struct net_device *dev;
2419 unsigned long timeout;
2426 /* check the lifetime */
2427 if (!valid_lft || prefered_lft > valid_lft)
2430 dev = __dev_get_by_index(net, ifindex);
2434 idev = addrconf_add_dev(dev);
2436 return PTR_ERR(idev);
2438 scope = ipv6_addr_scope(pfx);
2440 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2441 if (addrconf_finite_timeout(timeout)) {
2442 expires = jiffies_to_clock_t(timeout * HZ);
2443 valid_lft = timeout;
2444 flags = RTF_EXPIRES;
2448 ifa_flags |= IFA_F_PERMANENT;
2451 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2452 if (addrconf_finite_timeout(timeout)) {
2454 ifa_flags |= IFA_F_DEPRECATED;
2455 prefered_lft = timeout;
2458 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2461 spin_lock_bh(&ifp->lock);
2462 ifp->valid_lft = valid_lft;
2463 ifp->prefered_lft = prefered_lft;
2464 ifp->tstamp = jiffies;
2466 ifp->peer_addr = *peer_pfx;
2467 spin_unlock_bh(&ifp->lock);
2469 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2472 * Note that section 3.1 of RFC 4429 indicates
2473 * that the Optimistic flag should not be set for
2474 * manually configured addresses
2476 addrconf_dad_start(ifp);
2482 return PTR_ERR(ifp);
2485 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
2488 struct inet6_ifaddr *ifp;
2489 struct inet6_dev *idev;
2490 struct net_device *dev;
2495 dev = __dev_get_by_index(net, ifindex);
2499 if ((idev = __in6_dev_get(dev)) == NULL)
2502 read_lock_bh(&idev->lock);
2503 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2504 if (ifp->prefix_len == plen &&
2505 ipv6_addr_equal(pfx, &ifp->addr)) {
2507 read_unlock_bh(&idev->lock);
2513 read_unlock_bh(&idev->lock);
2514 return -EADDRNOTAVAIL;
2518 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2520 struct in6_ifreq ireq;
2523 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2526 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2530 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2531 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2532 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2537 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2539 struct in6_ifreq ireq;
2542 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2545 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2549 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2550 ireq.ifr6_prefixlen);
2555 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2556 int plen, int scope)
2558 struct inet6_ifaddr *ifp;
2560 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2562 spin_lock_bh(&ifp->lock);
2563 ifp->flags &= ~IFA_F_TENTATIVE;
2564 spin_unlock_bh(&ifp->lock);
2565 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2570 #if IS_ENABLED(CONFIG_IPV6_SIT)
2571 static void sit_add_v4_addrs(struct inet6_dev *idev)
2573 struct in6_addr addr;
2574 struct net_device *dev;
2575 struct net *net = dev_net(idev->dev);
2580 memset(&addr, 0, sizeof(struct in6_addr));
2581 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2583 if (idev->dev->flags&IFF_POINTOPOINT) {
2584 addr.s6_addr32[0] = htonl(0xfe800000);
2587 scope = IPV6_ADDR_COMPATv4;
2590 if (addr.s6_addr32[3]) {
2591 add_addr(idev, &addr, 128, scope);
2595 for_each_netdev(net, dev) {
2596 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2597 if (in_dev && (dev->flags & IFF_UP)) {
2598 struct in_ifaddr *ifa;
2602 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2605 addr.s6_addr32[3] = ifa->ifa_local;
2607 if (ifa->ifa_scope == RT_SCOPE_LINK)
2609 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2610 if (idev->dev->flags&IFF_POINTOPOINT)
2614 if (idev->dev->flags&IFF_POINTOPOINT)
2619 add_addr(idev, &addr, plen, flag);
2626 static void init_loopback(struct net_device *dev)
2628 struct inet6_dev *idev;
2629 struct net_device *sp_dev;
2630 struct inet6_ifaddr *sp_ifa;
2631 struct rt6_info *sp_rt;
2637 if ((idev = ipv6_find_idev(dev)) == NULL) {
2638 pr_debug("%s: add_dev failed\n", __func__);
2642 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2644 /* Add routes to other interface's IPv6 addresses */
2645 for_each_netdev(dev_net(dev), sp_dev) {
2646 if (!strcmp(sp_dev->name, dev->name))
2649 idev = __in6_dev_get(sp_dev);
2653 read_lock_bh(&idev->lock);
2654 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2656 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2659 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, 0);
2661 /* Failure cases are ignored */
2662 if (!IS_ERR(sp_rt)) {
2667 read_unlock_bh(&idev->lock);
2671 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
2673 struct inet6_ifaddr *ifp;
2674 u32 addr_flags = IFA_F_PERMANENT;
2676 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2677 if (idev->cnf.optimistic_dad &&
2678 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2679 addr_flags |= IFA_F_OPTIMISTIC;
2683 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2685 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2686 addrconf_dad_start(ifp);
2691 static void addrconf_dev_config(struct net_device *dev)
2693 struct in6_addr addr;
2694 struct inet6_dev *idev;
2698 if ((dev->type != ARPHRD_ETHER) &&
2699 (dev->type != ARPHRD_FDDI) &&
2700 (dev->type != ARPHRD_ARCNET) &&
2701 (dev->type != ARPHRD_INFINIBAND) &&
2702 (dev->type != ARPHRD_IEEE802154) &&
2703 (dev->type != ARPHRD_IEEE1394)) {
2704 /* Alas, we support only Ethernet autoconfiguration. */
2708 idev = addrconf_add_dev(dev);
2712 memset(&addr, 0, sizeof(struct in6_addr));
2713 addr.s6_addr32[0] = htonl(0xFE800000);
2715 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2716 addrconf_add_linklocal(idev, &addr);
2719 #if IS_ENABLED(CONFIG_IPV6_SIT)
2720 static void addrconf_sit_config(struct net_device *dev)
2722 struct inet6_dev *idev;
2727 * Configure the tunnel with one of our IPv4
2728 * addresses... we should configure all of
2729 * our v4 addrs in the tunnel
2732 if ((idev = ipv6_find_idev(dev)) == NULL) {
2733 pr_debug("%s: add_dev failed\n", __func__);
2737 if (dev->priv_flags & IFF_ISATAP) {
2738 struct in6_addr addr;
2740 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2741 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2742 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2743 addrconf_add_linklocal(idev, &addr);
2747 sit_add_v4_addrs(idev);
2749 if (dev->flags&IFF_POINTOPOINT)
2750 addrconf_add_mroute(dev);
2756 #if IS_ENABLED(CONFIG_NET_IPGRE)
2757 static void addrconf_gre_config(struct net_device *dev)
2759 struct inet6_dev *idev;
2760 struct in6_addr addr;
2764 if ((idev = ipv6_find_idev(dev)) == NULL) {
2765 pr_debug("%s: add_dev failed\n", __func__);
2769 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2770 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2772 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2773 addrconf_add_linklocal(idev, &addr);
2778 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2780 struct in6_addr lladdr;
2782 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2783 addrconf_add_linklocal(idev, &lladdr);
2789 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2791 struct net_device *link_dev;
2792 struct net *net = dev_net(idev->dev);
2794 /* first try to inherit the link-local address from the link device */
2795 if (idev->dev->iflink &&
2796 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2797 if (!ipv6_inherit_linklocal(idev, link_dev))
2800 /* then try to inherit it from any device */
2801 for_each_netdev(net, link_dev) {
2802 if (!ipv6_inherit_linklocal(idev, link_dev))
2805 pr_debug("init ip6-ip6: add_linklocal failed\n");
2809 * Autoconfigure tunnel with a link-local address so routing protocols,
2810 * DHCPv6, MLD etc. can be run over the virtual link
2813 static void addrconf_ip6_tnl_config(struct net_device *dev)
2815 struct inet6_dev *idev;
2819 idev = addrconf_add_dev(dev);
2821 pr_debug("init ip6-ip6: add_dev failed\n");
2824 ip6_tnl_add_linklocal(idev);
2827 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2830 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2831 struct inet6_dev *idev = __in6_dev_get(dev);
2832 int run_pending = 0;
2836 case NETDEV_REGISTER:
2837 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2838 idev = ipv6_add_dev(dev);
2840 return notifier_from_errno(-ENOMEM);
2846 if (dev->flags & IFF_SLAVE)
2849 if (event == NETDEV_UP) {
2850 if (!addrconf_qdisc_ok(dev)) {
2851 /* device is not ready yet. */
2852 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
2857 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2858 idev = ipv6_add_dev(dev);
2861 idev->if_flags |= IF_READY;
2865 if (!addrconf_qdisc_ok(dev)) {
2866 /* device is still not ready. */
2871 if (idev->if_flags & IF_READY)
2872 /* device is already configured. */
2874 idev->if_flags |= IF_READY;
2877 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
2883 switch (dev->type) {
2884 #if IS_ENABLED(CONFIG_IPV6_SIT)
2886 addrconf_sit_config(dev);
2889 #if IS_ENABLED(CONFIG_NET_IPGRE)
2891 addrconf_gre_config(dev);
2894 case ARPHRD_TUNNEL6:
2895 addrconf_ip6_tnl_config(dev);
2897 case ARPHRD_LOOPBACK:
2902 addrconf_dev_config(dev);
2908 addrconf_dad_run(idev);
2911 * If the MTU changed during the interface down,
2912 * when the interface up, the changed MTU must be
2913 * reflected in the idev as well as routers.
2915 if (idev->cnf.mtu6 != dev->mtu &&
2916 dev->mtu >= IPV6_MIN_MTU) {
2917 rt6_mtu_change(dev, dev->mtu);
2918 idev->cnf.mtu6 = dev->mtu;
2920 idev->tstamp = jiffies;
2921 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2924 * If the changed mtu during down is lower than
2925 * IPV6_MIN_MTU stop IPv6 on this interface.
2927 if (dev->mtu < IPV6_MIN_MTU)
2928 addrconf_ifdown(dev, 1);
2932 case NETDEV_CHANGEMTU:
2933 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2934 rt6_mtu_change(dev, dev->mtu);
2935 idev->cnf.mtu6 = dev->mtu;
2939 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2940 idev = ipv6_add_dev(dev);
2946 * MTU falled under IPV6_MIN_MTU.
2947 * Stop IPv6 on this interface.
2951 case NETDEV_UNREGISTER:
2953 * Remove all addresses from this interface.
2955 addrconf_ifdown(dev, event != NETDEV_DOWN);
2958 case NETDEV_CHANGENAME:
2960 snmp6_unregister_dev(idev);
2961 addrconf_sysctl_unregister(idev);
2962 addrconf_sysctl_register(idev);
2963 err = snmp6_register_dev(idev);
2965 return notifier_from_errno(err);
2969 case NETDEV_PRE_TYPE_CHANGE:
2970 case NETDEV_POST_TYPE_CHANGE:
2971 addrconf_type_change(dev, event);
2979 * addrconf module should be notified of a device going up
2981 static struct notifier_block ipv6_dev_notf = {
2982 .notifier_call = addrconf_notify,
2985 static void addrconf_type_change(struct net_device *dev, unsigned long event)
2987 struct inet6_dev *idev;
2990 idev = __in6_dev_get(dev);
2992 if (event == NETDEV_POST_TYPE_CHANGE)
2993 ipv6_mc_remap(idev);
2994 else if (event == NETDEV_PRE_TYPE_CHANGE)
2995 ipv6_mc_unmap(idev);
2998 static int addrconf_ifdown(struct net_device *dev, int how)
3000 struct net *net = dev_net(dev);
3001 struct inet6_dev *idev;
3002 struct inet6_ifaddr *ifa;
3007 rt6_ifdown(net, dev);
3008 neigh_ifdown(&nd_tbl, dev);
3010 idev = __in6_dev_get(dev);
3015 * Step 1: remove reference to ipv6 device from parent device.
3021 /* protected by rtnl_lock */
3022 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3024 /* Step 1.5: remove snmp6 entry */
3025 snmp6_unregister_dev(idev);
3029 /* Step 2: clear hash table */
3030 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3031 struct hlist_head *h = &inet6_addr_lst[i];
3033 spin_lock_bh(&addrconf_hash_lock);
3035 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3036 if (ifa->idev == idev) {
3037 hlist_del_init_rcu(&ifa->addr_lst);
3038 addrconf_del_dad_timer(ifa);
3042 spin_unlock_bh(&addrconf_hash_lock);
3045 write_lock_bh(&idev->lock);
3047 addrconf_del_rs_timer(idev);
3049 /* Step 2: clear flags for stateless addrconf */
3051 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3053 #ifdef CONFIG_IPV6_PRIVACY
3054 if (how && del_timer(&idev->regen_timer))
3057 /* Step 3: clear tempaddr list */
3058 while (!list_empty(&idev->tempaddr_list)) {
3059 ifa = list_first_entry(&idev->tempaddr_list,
3060 struct inet6_ifaddr, tmp_list);
3061 list_del(&ifa->tmp_list);
3062 write_unlock_bh(&idev->lock);
3063 spin_lock_bh(&ifa->lock);
3066 in6_ifa_put(ifa->ifpub);
3069 spin_unlock_bh(&ifa->lock);
3071 write_lock_bh(&idev->lock);
3075 while (!list_empty(&idev->addr_list)) {
3076 ifa = list_first_entry(&idev->addr_list,
3077 struct inet6_ifaddr, if_list);
3078 addrconf_del_dad_timer(ifa);
3080 list_del(&ifa->if_list);
3082 write_unlock_bh(&idev->lock);
3084 spin_lock_bh(&ifa->state_lock);
3086 ifa->state = INET6_IFADDR_STATE_DEAD;
3087 spin_unlock_bh(&ifa->state_lock);
3089 if (state != INET6_IFADDR_STATE_DEAD) {
3090 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3091 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3095 write_lock_bh(&idev->lock);
3098 write_unlock_bh(&idev->lock);
3100 /* Step 5: Discard multicast list */
3102 ipv6_mc_destroy_dev(idev);
3106 idev->tstamp = jiffies;
3108 /* Last: Shot the device (if unregistered) */
3110 addrconf_sysctl_unregister(idev);
3111 neigh_parms_release(&nd_tbl, idev->nd_parms);
3112 neigh_ifdown(&nd_tbl, dev);
3118 static void addrconf_rs_timer(unsigned long data)
3120 struct inet6_dev *idev = (struct inet6_dev *)data;
3121 struct in6_addr lladdr;
3123 write_lock(&idev->lock);
3124 if (idev->dead || !(idev->if_flags & IF_READY))
3127 if (!ipv6_accept_ra(idev))
3130 /* Announcement received after solicitation was sent */
3131 if (idev->if_flags & IF_RA_RCVD)
3134 if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
3135 if (!__ipv6_get_lladdr(idev, &lladdr, IFA_F_TENTATIVE))
3136 ndisc_send_rs(idev->dev, &lladdr,
3137 &in6addr_linklocal_allrouters);
3141 /* The wait after the last probe can be shorter */
3142 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3143 idev->cnf.rtr_solicits) ?
3144 idev->cnf.rtr_solicit_delay :
3145 idev->cnf.rtr_solicit_interval);
3148 * Note: we do not support deprecated "all on-link"
3149 * assumption any longer.
3151 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3155 write_unlock(&idev->lock);
3160 * Duplicate Address Detection
3162 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3164 unsigned long rand_num;
3165 struct inet6_dev *idev = ifp->idev;
3167 if (ifp->flags & IFA_F_OPTIMISTIC)
3170 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
3172 ifp->dad_probes = idev->cnf.dad_transmits;
3173 addrconf_mod_dad_timer(ifp, rand_num);
3176 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3178 struct inet6_dev *idev = ifp->idev;
3179 struct net_device *dev = idev->dev;
3181 addrconf_join_solict(dev, &ifp->addr);
3183 net_srandom(ifp->addr.s6_addr32[3]);
3185 read_lock_bh(&idev->lock);
3186 spin_lock(&ifp->lock);
3187 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3190 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3191 idev->cnf.accept_dad < 1 ||
3192 !(ifp->flags&IFA_F_TENTATIVE) ||
3193 ifp->flags & IFA_F_NODAD) {
3194 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3195 spin_unlock(&ifp->lock);
3196 read_unlock_bh(&idev->lock);
3198 addrconf_dad_completed(ifp);
3202 if (!(idev->if_flags & IF_READY)) {
3203 spin_unlock(&ifp->lock);
3204 read_unlock_bh(&idev->lock);
3206 * If the device is not ready:
3207 * - keep it tentative if it is a permanent address.
3208 * - otherwise, kill it.
3211 addrconf_dad_stop(ifp, 0);
3216 * Optimistic nodes can start receiving
3219 if (ifp->flags & IFA_F_OPTIMISTIC)
3220 ip6_ins_rt(ifp->rt);
3222 addrconf_dad_kick(ifp);
3224 spin_unlock(&ifp->lock);
3225 read_unlock_bh(&idev->lock);
3228 static void addrconf_dad_timer(unsigned long data)
3230 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
3231 struct inet6_dev *idev = ifp->idev;
3232 struct in6_addr mcaddr;
3234 if (!ifp->dad_probes && addrconf_dad_end(ifp))
3237 write_lock(&idev->lock);
3238 if (idev->dead || !(idev->if_flags & IF_READY)) {
3239 write_unlock(&idev->lock);
3243 spin_lock(&ifp->lock);
3244 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3245 spin_unlock(&ifp->lock);
3246 write_unlock(&idev->lock);
3250 if (ifp->dad_probes == 0) {
3252 * DAD was successful
3255 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3256 spin_unlock(&ifp->lock);
3257 write_unlock(&idev->lock);
3259 addrconf_dad_completed(ifp);
3265 addrconf_mod_dad_timer(ifp, ifp->idev->nd_parms->retrans_time);
3266 spin_unlock(&ifp->lock);
3267 write_unlock(&idev->lock);
3269 /* send a neighbour solicitation for our addr */
3270 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3271 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
3276 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3278 struct net_device *dev = ifp->idev->dev;
3279 struct in6_addr lladdr;
3280 bool send_rs, send_mld;
3282 addrconf_del_dad_timer(ifp);
3285 * Configure the address for reception. Now it is valid.
3288 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3290 /* If added prefix is link local and we are prepared to process
3291 router advertisements, start sending router solicitations.
3294 read_lock_bh(&ifp->idev->lock);
3295 spin_lock(&ifp->lock);
3296 send_mld = ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL &&
3297 ifp->idev->valid_ll_addr_cnt == 1;
3298 send_rs = send_mld &&
3299 ipv6_accept_ra(ifp->idev) &&
3300 ifp->idev->cnf.rtr_solicits > 0 &&
3301 (dev->flags&IFF_LOOPBACK) == 0;
3302 spin_unlock(&ifp->lock);
3303 read_unlock_bh(&ifp->idev->lock);
3305 /* While dad is in progress mld report's source address is in6_addrany.
3306 * Resend with proper ll now.
3309 ipv6_mc_dad_complete(ifp->idev);
3313 * If a host as already performed a random delay
3314 * [...] as part of DAD [...] there is no need
3315 * to delay again before sending the first RS
3317 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3319 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
3321 write_lock_bh(&ifp->idev->lock);
3322 spin_lock(&ifp->lock);
3323 ifp->idev->rs_probes = 1;
3324 ifp->idev->if_flags |= IF_RS_SENT;
3325 addrconf_mod_rs_timer(ifp->idev,
3326 ifp->idev->cnf.rtr_solicit_interval);
3327 spin_unlock(&ifp->lock);
3328 write_unlock_bh(&ifp->idev->lock);
3332 static void addrconf_dad_run(struct inet6_dev *idev)
3334 struct inet6_ifaddr *ifp;
3336 read_lock_bh(&idev->lock);
3337 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3338 spin_lock(&ifp->lock);
3339 if (ifp->flags & IFA_F_TENTATIVE &&
3340 ifp->state == INET6_IFADDR_STATE_DAD)
3341 addrconf_dad_kick(ifp);
3342 spin_unlock(&ifp->lock);
3344 read_unlock_bh(&idev->lock);
3347 #ifdef CONFIG_PROC_FS
3348 struct if6_iter_state {
3349 struct seq_net_private p;
3354 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3356 struct inet6_ifaddr *ifa = NULL;
3357 struct if6_iter_state *state = seq->private;
3358 struct net *net = seq_file_net(seq);
3361 /* initial bucket if pos is 0 */
3367 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3368 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
3370 if (!net_eq(dev_net(ifa->idev->dev), net))
3372 /* sync with offset */
3373 if (p < state->offset) {
3381 /* prepare for next bucket */
3388 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3389 struct inet6_ifaddr *ifa)
3391 struct if6_iter_state *state = seq->private;
3392 struct net *net = seq_file_net(seq);
3394 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
3395 if (!net_eq(dev_net(ifa->idev->dev), net))
3401 while (++state->bucket < IN6_ADDR_HSIZE) {
3403 hlist_for_each_entry_rcu_bh(ifa,
3404 &inet6_addr_lst[state->bucket], addr_lst) {
3405 if (!net_eq(dev_net(ifa->idev->dev), net))
3415 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3419 return if6_get_first(seq, *pos);
3422 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3424 struct inet6_ifaddr *ifa;
3426 ifa = if6_get_next(seq, v);
3431 static void if6_seq_stop(struct seq_file *seq, void *v)
3434 rcu_read_unlock_bh();
3437 static int if6_seq_show(struct seq_file *seq, void *v)
3439 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3440 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3442 ifp->idev->dev->ifindex,
3446 ifp->idev->dev->name);
3450 static const struct seq_operations if6_seq_ops = {
3451 .start = if6_seq_start,
3452 .next = if6_seq_next,
3453 .show = if6_seq_show,
3454 .stop = if6_seq_stop,
3457 static int if6_seq_open(struct inode *inode, struct file *file)
3459 return seq_open_net(inode, file, &if6_seq_ops,
3460 sizeof(struct if6_iter_state));
3463 static const struct file_operations if6_fops = {
3464 .owner = THIS_MODULE,
3465 .open = if6_seq_open,
3467 .llseek = seq_lseek,
3468 .release = seq_release_net,
3471 static int __net_init if6_proc_net_init(struct net *net)
3473 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
3478 static void __net_exit if6_proc_net_exit(struct net *net)
3480 remove_proc_entry("if_inet6", net->proc_net);
3483 static struct pernet_operations if6_proc_net_ops = {
3484 .init = if6_proc_net_init,
3485 .exit = if6_proc_net_exit,
3488 int __init if6_proc_init(void)
3490 return register_pernet_subsys(&if6_proc_net_ops);
3493 void if6_proc_exit(void)
3495 unregister_pernet_subsys(&if6_proc_net_ops);
3497 #endif /* CONFIG_PROC_FS */
3499 #if IS_ENABLED(CONFIG_IPV6_MIP6)
3500 /* Check if address is a home address configured on any interface. */
3501 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3504 struct inet6_ifaddr *ifp = NULL;
3505 unsigned int hash = inet6_addr_hash(addr);
3508 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
3509 if (!net_eq(dev_net(ifp->idev->dev), net))
3511 if (ipv6_addr_equal(&ifp->addr, addr) &&
3512 (ifp->flags & IFA_F_HOMEADDRESS)) {
3517 rcu_read_unlock_bh();
3523 * Periodic address status verification
3526 static void addrconf_verify(unsigned long foo)
3528 unsigned long now, next, next_sec, next_sched;
3529 struct inet6_ifaddr *ifp;
3533 spin_lock(&addrconf_verify_lock);
3535 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3537 del_timer(&addr_chk_timer);
3539 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3541 hlist_for_each_entry_rcu_bh(ifp,
3542 &inet6_addr_lst[i], addr_lst) {
3545 if (ifp->flags & IFA_F_PERMANENT)
3548 spin_lock(&ifp->lock);
3549 /* We try to batch several events at once. */
3550 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3552 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3553 age >= ifp->valid_lft) {
3554 spin_unlock(&ifp->lock);
3558 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3559 spin_unlock(&ifp->lock);
3561 } else if (age >= ifp->prefered_lft) {
3562 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3565 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3567 ifp->flags |= IFA_F_DEPRECATED;
3570 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3571 next = ifp->tstamp + ifp->valid_lft * HZ;
3573 spin_unlock(&ifp->lock);
3578 ipv6_ifa_notify(0, ifp);
3582 #ifdef CONFIG_IPV6_PRIVACY
3583 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3584 !(ifp->flags&IFA_F_TENTATIVE)) {
3585 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3586 ifp->idev->cnf.dad_transmits *
3587 ifp->idev->nd_parms->retrans_time / HZ;
3589 if (age >= ifp->prefered_lft - regen_advance) {
3590 struct inet6_ifaddr *ifpub = ifp->ifpub;
3591 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3592 next = ifp->tstamp + ifp->prefered_lft * HZ;
3593 if (!ifp->regen_count && ifpub) {
3596 in6_ifa_hold(ifpub);
3597 spin_unlock(&ifp->lock);
3599 spin_lock(&ifpub->lock);
3600 ifpub->regen_count = 0;
3601 spin_unlock(&ifpub->lock);
3602 ipv6_create_tempaddr(ifpub, ifp);
3607 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3608 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3609 spin_unlock(&ifp->lock);
3612 /* ifp->prefered_lft <= ifp->valid_lft */
3613 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3614 next = ifp->tstamp + ifp->prefered_lft * HZ;
3615 spin_unlock(&ifp->lock);
3620 next_sec = round_jiffies_up(next);
3623 /* If rounded timeout is accurate enough, accept it. */
3624 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3625 next_sched = next_sec;
3627 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3628 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3629 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3631 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3632 now, next, next_sec, next_sched));
3634 addr_chk_timer.expires = next_sched;
3635 add_timer(&addr_chk_timer);
3636 spin_unlock(&addrconf_verify_lock);
3637 rcu_read_unlock_bh();
3640 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
3641 struct in6_addr **peer_pfx)
3643 struct in6_addr *pfx = NULL;
3648 pfx = nla_data(addr);
3651 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3653 pfx = nla_data(local);
3659 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3660 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3661 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3662 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3666 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
3668 struct net *net = sock_net(skb->sk);
3669 struct ifaddrmsg *ifm;
3670 struct nlattr *tb[IFA_MAX+1];
3671 struct in6_addr *pfx, *peer_pfx;
3674 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3678 ifm = nlmsg_data(nlh);
3679 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
3683 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3686 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3687 u32 prefered_lft, u32 valid_lft)
3691 unsigned long timeout;
3693 if (!valid_lft || (prefered_lft > valid_lft))
3696 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3697 if (addrconf_finite_timeout(timeout)) {
3698 expires = jiffies_to_clock_t(timeout * HZ);
3699 valid_lft = timeout;
3700 flags = RTF_EXPIRES;
3704 ifa_flags |= IFA_F_PERMANENT;
3707 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3708 if (addrconf_finite_timeout(timeout)) {
3710 ifa_flags |= IFA_F_DEPRECATED;
3711 prefered_lft = timeout;
3714 spin_lock_bh(&ifp->lock);
3715 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3716 ifp->tstamp = jiffies;
3717 ifp->valid_lft = valid_lft;
3718 ifp->prefered_lft = prefered_lft;
3720 spin_unlock_bh(&ifp->lock);
3721 if (!(ifp->flags&IFA_F_TENTATIVE))
3722 ipv6_ifa_notify(0, ifp);
3724 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3732 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
3734 struct net *net = sock_net(skb->sk);
3735 struct ifaddrmsg *ifm;
3736 struct nlattr *tb[IFA_MAX+1];
3737 struct in6_addr *pfx, *peer_pfx;
3738 struct inet6_ifaddr *ifa;
3739 struct net_device *dev;
3740 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3744 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3748 ifm = nlmsg_data(nlh);
3749 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
3753 if (tb[IFA_CACHEINFO]) {
3754 struct ifa_cacheinfo *ci;
3756 ci = nla_data(tb[IFA_CACHEINFO]);
3757 valid_lft = ci->ifa_valid;
3758 preferred_lft = ci->ifa_prefered;
3760 preferred_lft = INFINITY_LIFE_TIME;
3761 valid_lft = INFINITY_LIFE_TIME;
3764 dev = __dev_get_by_index(net, ifm->ifa_index);
3768 /* We ignore other flags so far. */
3769 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3771 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3774 * It would be best to check for !NLM_F_CREATE here but
3775 * userspace alreay relies on not having to provide this.
3777 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
3778 ifm->ifa_prefixlen, ifa_flags,
3779 preferred_lft, valid_lft);
3782 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3783 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3786 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3793 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3794 u8 scope, int ifindex)
3796 struct ifaddrmsg *ifm;
3798 ifm = nlmsg_data(nlh);
3799 ifm->ifa_family = AF_INET6;
3800 ifm->ifa_prefixlen = prefixlen;
3801 ifm->ifa_flags = flags;
3802 ifm->ifa_scope = scope;
3803 ifm->ifa_index = ifindex;
3806 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3807 unsigned long tstamp, u32 preferred, u32 valid)
3809 struct ifa_cacheinfo ci;
3811 ci.cstamp = cstamp_delta(cstamp);
3812 ci.tstamp = cstamp_delta(tstamp);
3813 ci.ifa_prefered = preferred;
3814 ci.ifa_valid = valid;
3816 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3819 static inline int rt_scope(int ifa_scope)
3821 if (ifa_scope & IFA_HOST)
3822 return RT_SCOPE_HOST;
3823 else if (ifa_scope & IFA_LINK)
3824 return RT_SCOPE_LINK;
3825 else if (ifa_scope & IFA_SITE)
3826 return RT_SCOPE_SITE;
3828 return RT_SCOPE_UNIVERSE;
3831 static inline int inet6_ifaddr_msgsize(void)
3833 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3834 + nla_total_size(16) /* IFA_LOCAL */
3835 + nla_total_size(16) /* IFA_ADDRESS */
3836 + nla_total_size(sizeof(struct ifa_cacheinfo));
3839 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3840 u32 portid, u32 seq, int event, unsigned int flags)
3842 struct nlmsghdr *nlh;
3843 u32 preferred, valid;
3845 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3849 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3850 ifa->idev->dev->ifindex);
3852 if (!(ifa->flags&IFA_F_PERMANENT)) {
3853 preferred = ifa->prefered_lft;
3854 valid = ifa->valid_lft;
3855 if (preferred != INFINITY_LIFE_TIME) {
3856 long tval = (jiffies - ifa->tstamp)/HZ;
3857 if (preferred > tval)
3861 if (valid != INFINITY_LIFE_TIME) {
3869 preferred = INFINITY_LIFE_TIME;
3870 valid = INFINITY_LIFE_TIME;
3873 if (!ipv6_addr_any(&ifa->peer_addr)) {
3874 if (nla_put(skb, IFA_LOCAL, 16, &ifa->addr) < 0 ||
3875 nla_put(skb, IFA_ADDRESS, 16, &ifa->peer_addr) < 0)
3878 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0)
3881 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
3884 return nlmsg_end(skb, nlh);
3887 nlmsg_cancel(skb, nlh);
3891 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3892 u32 portid, u32 seq, int event, u16 flags)
3894 struct nlmsghdr *nlh;
3895 u8 scope = RT_SCOPE_UNIVERSE;
3896 int ifindex = ifmca->idev->dev->ifindex;
3898 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3899 scope = RT_SCOPE_SITE;
3901 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3905 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3906 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3907 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3908 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3909 nlmsg_cancel(skb, nlh);
3913 return nlmsg_end(skb, nlh);
3916 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3917 u32 portid, u32 seq, int event, unsigned int flags)
3919 struct nlmsghdr *nlh;
3920 u8 scope = RT_SCOPE_UNIVERSE;
3921 int ifindex = ifaca->aca_idev->dev->ifindex;
3923 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3924 scope = RT_SCOPE_SITE;
3926 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3930 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3931 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3932 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3933 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3934 nlmsg_cancel(skb, nlh);
3938 return nlmsg_end(skb, nlh);
3947 /* called with rcu_read_lock() */
3948 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3949 struct netlink_callback *cb, enum addr_type_t type,
3950 int s_ip_idx, int *p_ip_idx)
3952 struct ifmcaddr6 *ifmca;
3953 struct ifacaddr6 *ifaca;
3955 int ip_idx = *p_ip_idx;
3957 read_lock_bh(&idev->lock);
3959 case UNICAST_ADDR: {
3960 struct inet6_ifaddr *ifa;
3962 /* unicast address incl. temp addr */
3963 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3964 if (++ip_idx < s_ip_idx)
3966 err = inet6_fill_ifaddr(skb, ifa,
3967 NETLINK_CB(cb->skb).portid,
3973 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3977 case MULTICAST_ADDR:
3978 /* multicast address */
3979 for (ifmca = idev->mc_list; ifmca;
3980 ifmca = ifmca->next, ip_idx++) {
3981 if (ip_idx < s_ip_idx)
3983 err = inet6_fill_ifmcaddr(skb, ifmca,
3984 NETLINK_CB(cb->skb).portid,
3993 /* anycast address */
3994 for (ifaca = idev->ac_list; ifaca;
3995 ifaca = ifaca->aca_next, ip_idx++) {
3996 if (ip_idx < s_ip_idx)
3998 err = inet6_fill_ifacaddr(skb, ifaca,
3999 NETLINK_CB(cb->skb).portid,
4010 read_unlock_bh(&idev->lock);
4015 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4016 enum addr_type_t type)
4018 struct net *net = sock_net(skb->sk);
4021 int s_idx, s_ip_idx;
4022 struct net_device *dev;
4023 struct inet6_dev *idev;
4024 struct hlist_head *head;
4027 s_idx = idx = cb->args[1];
4028 s_ip_idx = ip_idx = cb->args[2];
4031 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4032 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4034 head = &net->dev_index_head[h];
4035 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4038 if (h > s_h || idx > s_idx)
4041 idev = __in6_dev_get(dev);
4045 if (in6_dump_addrs(idev, skb, cb, type,
4046 s_ip_idx, &ip_idx) <= 0)
4056 cb->args[2] = ip_idx;
4061 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4063 enum addr_type_t type = UNICAST_ADDR;
4065 return inet6_dump_addr(skb, cb, type);
4068 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4070 enum addr_type_t type = MULTICAST_ADDR;
4072 return inet6_dump_addr(skb, cb, type);
4076 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4078 enum addr_type_t type = ANYCAST_ADDR;
4080 return inet6_dump_addr(skb, cb, type);
4083 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
4085 struct net *net = sock_net(in_skb->sk);
4086 struct ifaddrmsg *ifm;
4087 struct nlattr *tb[IFA_MAX+1];
4088 struct in6_addr *addr = NULL, *peer;
4089 struct net_device *dev = NULL;
4090 struct inet6_ifaddr *ifa;
4091 struct sk_buff *skb;
4094 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4098 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4104 ifm = nlmsg_data(nlh);
4106 dev = __dev_get_by_index(net, ifm->ifa_index);
4108 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4110 err = -EADDRNOTAVAIL;
4114 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4120 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4121 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4123 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4124 WARN_ON(err == -EMSGSIZE);
4128 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4135 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4137 struct sk_buff *skb;
4138 struct net *net = dev_net(ifa->idev->dev);
4141 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4145 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4147 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4148 WARN_ON(err == -EMSGSIZE);
4152 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4156 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4159 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4160 __s32 *array, int bytes)
4162 BUG_ON(bytes < (DEVCONF_MAX * 4));
4164 memset(array, 0, bytes);
4165 array[DEVCONF_FORWARDING] = cnf->forwarding;
4166 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4167 array[DEVCONF_MTU6] = cnf->mtu6;
4168 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4169 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4170 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4171 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4172 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4173 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4174 jiffies_to_msecs(cnf->rtr_solicit_interval);
4175 array[DEVCONF_RTR_SOLICIT_DELAY] =
4176 jiffies_to_msecs(cnf->rtr_solicit_delay);
4177 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4178 #ifdef CONFIG_IPV6_PRIVACY
4179 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4180 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4181 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4182 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4183 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4185 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4186 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4187 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4188 #ifdef CONFIG_IPV6_ROUTER_PREF
4189 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4190 array[DEVCONF_RTR_PROBE_INTERVAL] =
4191 jiffies_to_msecs(cnf->rtr_probe_interval);
4192 #ifdef CONFIG_IPV6_ROUTE_INFO
4193 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4196 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4197 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4198 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4199 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4201 #ifdef CONFIG_IPV6_MROUTE
4202 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4204 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4205 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4206 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4207 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4210 static inline size_t inet6_ifla6_size(void)
4212 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4213 + nla_total_size(sizeof(struct ifla_cacheinfo))
4214 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4215 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4216 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4217 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
4220 static inline size_t inet6_if_nlmsg_size(void)
4222 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4223 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4224 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4225 + nla_total_size(4) /* IFLA_MTU */
4226 + nla_total_size(4) /* IFLA_LINK */
4227 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4230 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4231 int items, int bytes)
4234 int pad = bytes - sizeof(u64) * items;
4237 /* Use put_unaligned() because stats may not be aligned for u64. */
4238 put_unaligned(items, &stats[0]);
4239 for (i = 1; i < items; i++)
4240 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4242 memset(&stats[items], 0, pad);
4245 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
4246 int items, int bytes, size_t syncpoff)
4249 int pad = bytes - sizeof(u64) * items;
4252 /* Use put_unaligned() because stats may not be aligned for u64. */
4253 put_unaligned(items, &stats[0]);
4254 for (i = 1; i < items; i++)
4255 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4257 memset(&stats[items], 0, pad);
4260 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4264 case IFLA_INET6_STATS:
4265 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
4266 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
4268 case IFLA_INET6_ICMP6STATS:
4269 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
4274 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4277 struct ifla_cacheinfo ci;
4279 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4280 goto nla_put_failure;
4281 ci.max_reasm_len = IPV6_MAXPLEN;
4282 ci.tstamp = cstamp_delta(idev->tstamp);
4283 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4284 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
4285 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4286 goto nla_put_failure;
4287 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4289 goto nla_put_failure;
4290 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4292 /* XXX - MC not implemented */
4294 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4296 goto nla_put_failure;
4297 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4299 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4301 goto nla_put_failure;
4302 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4304 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4306 goto nla_put_failure;
4307 read_lock_bh(&idev->lock);
4308 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4309 read_unlock_bh(&idev->lock);
4317 static size_t inet6_get_link_af_size(const struct net_device *dev)
4319 if (!__in6_dev_get(dev))
4322 return inet6_ifla6_size();
4325 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4327 struct inet6_dev *idev = __in6_dev_get(dev);
4332 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4338 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4340 struct inet6_ifaddr *ifp;
4341 struct net_device *dev = idev->dev;
4342 bool update_rs = false;
4346 if (ipv6_addr_any(token))
4348 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4350 if (!ipv6_accept_ra(idev))
4352 if (idev->cnf.rtr_solicits <= 0)
4355 write_lock_bh(&idev->lock);
4357 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4358 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4360 write_unlock_bh(&idev->lock);
4362 if (!idev->dead && (idev->if_flags & IF_READY)) {
4363 struct in6_addr ll_addr;
4365 ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4368 /* If we're not ready, then normal ifup will take care
4369 * of this. Otherwise, we need to request our rs here.
4371 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4375 write_lock_bh(&idev->lock);
4378 idev->if_flags |= IF_RS_SENT;
4379 idev->rs_probes = 1;
4380 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
4383 /* Well, that's kinda nasty ... */
4384 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4385 spin_lock(&ifp->lock);
4386 if (ifp->tokenized) {
4388 ifp->prefered_lft = 0;
4390 spin_unlock(&ifp->lock);
4393 write_unlock_bh(&idev->lock);
4398 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4401 struct inet6_dev *idev = __in6_dev_get(dev);
4402 struct nlattr *tb[IFLA_INET6_MAX + 1];
4405 return -EAFNOSUPPORT;
4407 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4410 if (tb[IFLA_INET6_TOKEN])
4411 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
4416 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4417 u32 portid, u32 seq, int event, unsigned int flags)
4419 struct net_device *dev = idev->dev;
4420 struct ifinfomsg *hdr;
4421 struct nlmsghdr *nlh;
4424 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
4428 hdr = nlmsg_data(nlh);
4429 hdr->ifi_family = AF_INET6;
4431 hdr->ifi_type = dev->type;
4432 hdr->ifi_index = dev->ifindex;
4433 hdr->ifi_flags = dev_get_flags(dev);
4434 hdr->ifi_change = 0;
4436 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4438 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4439 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4440 (dev->ifindex != dev->iflink &&
4441 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4442 goto nla_put_failure;
4443 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4444 if (protoinfo == NULL)
4445 goto nla_put_failure;
4447 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4448 goto nla_put_failure;
4450 nla_nest_end(skb, protoinfo);
4451 return nlmsg_end(skb, nlh);
4454 nlmsg_cancel(skb, nlh);
4458 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4460 struct net *net = sock_net(skb->sk);
4463 struct net_device *dev;
4464 struct inet6_dev *idev;
4465 struct hlist_head *head;
4468 s_idx = cb->args[1];
4471 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4473 head = &net->dev_index_head[h];
4474 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4477 idev = __in6_dev_get(dev);
4480 if (inet6_fill_ifinfo(skb, idev,
4481 NETLINK_CB(cb->skb).portid,
4483 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4497 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4499 struct sk_buff *skb;
4500 struct net *net = dev_net(idev->dev);
4503 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4507 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4509 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4510 WARN_ON(err == -EMSGSIZE);
4514 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4518 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4521 static inline size_t inet6_prefix_nlmsg_size(void)
4523 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4524 + nla_total_size(sizeof(struct in6_addr))
4525 + nla_total_size(sizeof(struct prefix_cacheinfo));
4528 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4529 struct prefix_info *pinfo, u32 portid, u32 seq,
4530 int event, unsigned int flags)
4532 struct prefixmsg *pmsg;
4533 struct nlmsghdr *nlh;
4534 struct prefix_cacheinfo ci;
4536 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
4540 pmsg = nlmsg_data(nlh);
4541 pmsg->prefix_family = AF_INET6;
4542 pmsg->prefix_pad1 = 0;
4543 pmsg->prefix_pad2 = 0;
4544 pmsg->prefix_ifindex = idev->dev->ifindex;
4545 pmsg->prefix_len = pinfo->prefix_len;
4546 pmsg->prefix_type = pinfo->type;
4547 pmsg->prefix_pad3 = 0;
4548 pmsg->prefix_flags = 0;
4550 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4551 if (pinfo->autoconf)
4552 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4554 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4555 goto nla_put_failure;
4556 ci.preferred_time = ntohl(pinfo->prefered);
4557 ci.valid_time = ntohl(pinfo->valid);
4558 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4559 goto nla_put_failure;
4560 return nlmsg_end(skb, nlh);
4563 nlmsg_cancel(skb, nlh);
4567 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4568 struct prefix_info *pinfo)
4570 struct sk_buff *skb;
4571 struct net *net = dev_net(idev->dev);
4574 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4578 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4580 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4581 WARN_ON(err == -EMSGSIZE);
4585 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4589 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4592 static void update_valid_ll_addr_cnt(struct inet6_ifaddr *ifp, int count)
4594 write_lock_bh(&ifp->idev->lock);
4595 spin_lock(&ifp->lock);
4596 if (((ifp->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|
4597 IFA_F_DADFAILED)) == IFA_F_PERMANENT) &&
4598 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL))
4599 ifp->idev->valid_ll_addr_cnt += count;
4600 WARN_ON(ifp->idev->valid_ll_addr_cnt < 0);
4601 spin_unlock(&ifp->lock);
4602 write_unlock_bh(&ifp->idev->lock);
4605 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4607 struct net *net = dev_net(ifp->idev->dev);
4609 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4613 update_valid_ll_addr_cnt(ifp, 1);
4616 * If the address was optimistic
4617 * we inserted the route at the start of
4618 * our DAD process, so we don't need
4621 if (!(ifp->rt->rt6i_node))
4622 ip6_ins_rt(ifp->rt);
4623 if (ifp->idev->cnf.forwarding)
4624 addrconf_join_anycast(ifp);
4625 if (!ipv6_addr_any(&ifp->peer_addr))
4626 addrconf_prefix_route(&ifp->peer_addr, 128,
4627 ifp->idev->dev, 0, 0);
4630 update_valid_ll_addr_cnt(ifp, -1);
4632 if (ifp->idev->cnf.forwarding)
4633 addrconf_leave_anycast(ifp);
4634 addrconf_leave_solict(ifp->idev, &ifp->addr);
4635 if (!ipv6_addr_any(&ifp->peer_addr)) {
4636 struct rt6_info *rt;
4637 struct net_device *dev = ifp->idev->dev;
4639 rt = rt6_lookup(dev_net(dev), &ifp->peer_addr, NULL,
4647 dst_hold(&ifp->rt->dst);
4649 if (ip6_del_rt(ifp->rt))
4650 dst_free(&ifp->rt->dst);
4653 atomic_inc(&net->ipv6.dev_addr_genid);
4656 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4659 if (likely(ifp->idev->dead == 0))
4660 __ipv6_ifa_notify(event, ifp);
4661 rcu_read_unlock_bh();
4664 #ifdef CONFIG_SYSCTL
4667 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
4668 void __user *buffer, size_t *lenp, loff_t *ppos)
4670 int *valp = ctl->data;
4673 struct ctl_table lctl;
4677 * ctl->data points to idev->cnf.forwarding, we should
4678 * not modify it until we get the rtnl lock.
4683 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4686 ret = addrconf_fixup_forwarding(ctl, valp, val);
4692 static void dev_disable_change(struct inet6_dev *idev)
4694 struct netdev_notifier_info info;
4696 if (!idev || !idev->dev)
4699 netdev_notifier_info_init(&info, idev->dev);
4700 if (idev->cnf.disable_ipv6)
4701 addrconf_notify(NULL, NETDEV_DOWN, &info);
4703 addrconf_notify(NULL, NETDEV_UP, &info);
4706 static void addrconf_disable_change(struct net *net, __s32 newf)
4708 struct net_device *dev;
4709 struct inet6_dev *idev;
4712 for_each_netdev_rcu(net, dev) {
4713 idev = __in6_dev_get(dev);
4715 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4716 idev->cnf.disable_ipv6 = newf;
4718 dev_disable_change(idev);
4724 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
4729 if (!rtnl_trylock())
4730 return restart_syscall();
4732 net = (struct net *)table->extra2;
4736 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4741 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4742 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4743 addrconf_disable_change(net, newf);
4744 } else if ((!newf) ^ (!old))
4745 dev_disable_change((struct inet6_dev *)table->extra1);
4752 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
4753 void __user *buffer, size_t *lenp, loff_t *ppos)
4755 int *valp = ctl->data;
4758 struct ctl_table lctl;
4762 * ctl->data points to idev->cnf.disable_ipv6, we should
4763 * not modify it until we get the rtnl lock.
4768 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4771 ret = addrconf_disable_ipv6(ctl, valp, val);
4777 static struct addrconf_sysctl_table
4779 struct ctl_table_header *sysctl_header;
4780 struct ctl_table addrconf_vars[DEVCONF_MAX+1];
4781 } addrconf_sysctl __read_mostly = {
4782 .sysctl_header = NULL,
4785 .procname = "forwarding",
4786 .data = &ipv6_devconf.forwarding,
4787 .maxlen = sizeof(int),
4789 .proc_handler = addrconf_sysctl_forward,
4792 .procname = "hop_limit",
4793 .data = &ipv6_devconf.hop_limit,
4794 .maxlen = sizeof(int),
4796 .proc_handler = proc_dointvec,
4800 .data = &ipv6_devconf.mtu6,
4801 .maxlen = sizeof(int),
4803 .proc_handler = proc_dointvec,
4806 .procname = "accept_ra",
4807 .data = &ipv6_devconf.accept_ra,
4808 .maxlen = sizeof(int),
4810 .proc_handler = proc_dointvec,
4813 .procname = "accept_redirects",
4814 .data = &ipv6_devconf.accept_redirects,
4815 .maxlen = sizeof(int),
4817 .proc_handler = proc_dointvec,
4820 .procname = "autoconf",
4821 .data = &ipv6_devconf.autoconf,
4822 .maxlen = sizeof(int),
4824 .proc_handler = proc_dointvec,
4827 .procname = "dad_transmits",
4828 .data = &ipv6_devconf.dad_transmits,
4829 .maxlen = sizeof(int),
4831 .proc_handler = proc_dointvec,
4834 .procname = "router_solicitations",
4835 .data = &ipv6_devconf.rtr_solicits,
4836 .maxlen = sizeof(int),
4838 .proc_handler = proc_dointvec,
4841 .procname = "router_solicitation_interval",
4842 .data = &ipv6_devconf.rtr_solicit_interval,
4843 .maxlen = sizeof(int),
4845 .proc_handler = proc_dointvec_jiffies,
4848 .procname = "router_solicitation_delay",
4849 .data = &ipv6_devconf.rtr_solicit_delay,
4850 .maxlen = sizeof(int),
4852 .proc_handler = proc_dointvec_jiffies,
4855 .procname = "force_mld_version",
4856 .data = &ipv6_devconf.force_mld_version,
4857 .maxlen = sizeof(int),
4859 .proc_handler = proc_dointvec,
4861 #ifdef CONFIG_IPV6_PRIVACY
4863 .procname = "use_tempaddr",
4864 .data = &ipv6_devconf.use_tempaddr,
4865 .maxlen = sizeof(int),
4867 .proc_handler = proc_dointvec,
4870 .procname = "temp_valid_lft",
4871 .data = &ipv6_devconf.temp_valid_lft,
4872 .maxlen = sizeof(int),
4874 .proc_handler = proc_dointvec,
4877 .procname = "temp_prefered_lft",
4878 .data = &ipv6_devconf.temp_prefered_lft,
4879 .maxlen = sizeof(int),
4881 .proc_handler = proc_dointvec,
4884 .procname = "regen_max_retry",
4885 .data = &ipv6_devconf.regen_max_retry,
4886 .maxlen = sizeof(int),
4888 .proc_handler = proc_dointvec,
4891 .procname = "max_desync_factor",
4892 .data = &ipv6_devconf.max_desync_factor,
4893 .maxlen = sizeof(int),
4895 .proc_handler = proc_dointvec,
4899 .procname = "max_addresses",
4900 .data = &ipv6_devconf.max_addresses,
4901 .maxlen = sizeof(int),
4903 .proc_handler = proc_dointvec,
4906 .procname = "accept_ra_defrtr",
4907 .data = &ipv6_devconf.accept_ra_defrtr,
4908 .maxlen = sizeof(int),
4910 .proc_handler = proc_dointvec,
4913 .procname = "accept_ra_pinfo",
4914 .data = &ipv6_devconf.accept_ra_pinfo,
4915 .maxlen = sizeof(int),
4917 .proc_handler = proc_dointvec,
4919 #ifdef CONFIG_IPV6_ROUTER_PREF
4921 .procname = "accept_ra_rtr_pref",
4922 .data = &ipv6_devconf.accept_ra_rtr_pref,
4923 .maxlen = sizeof(int),
4925 .proc_handler = proc_dointvec,
4928 .procname = "router_probe_interval",
4929 .data = &ipv6_devconf.rtr_probe_interval,
4930 .maxlen = sizeof(int),
4932 .proc_handler = proc_dointvec_jiffies,
4934 #ifdef CONFIG_IPV6_ROUTE_INFO
4936 .procname = "accept_ra_rt_info_max_plen",
4937 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4938 .maxlen = sizeof(int),
4940 .proc_handler = proc_dointvec,
4945 .procname = "proxy_ndp",
4946 .data = &ipv6_devconf.proxy_ndp,
4947 .maxlen = sizeof(int),
4949 .proc_handler = proc_dointvec,
4952 .procname = "accept_source_route",
4953 .data = &ipv6_devconf.accept_source_route,
4954 .maxlen = sizeof(int),
4956 .proc_handler = proc_dointvec,
4958 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4960 .procname = "optimistic_dad",
4961 .data = &ipv6_devconf.optimistic_dad,
4962 .maxlen = sizeof(int),
4964 .proc_handler = proc_dointvec,
4968 #ifdef CONFIG_IPV6_MROUTE
4970 .procname = "mc_forwarding",
4971 .data = &ipv6_devconf.mc_forwarding,
4972 .maxlen = sizeof(int),
4974 .proc_handler = proc_dointvec,
4978 .procname = "disable_ipv6",
4979 .data = &ipv6_devconf.disable_ipv6,
4980 .maxlen = sizeof(int),
4982 .proc_handler = addrconf_sysctl_disable,
4985 .procname = "accept_dad",
4986 .data = &ipv6_devconf.accept_dad,
4987 .maxlen = sizeof(int),
4989 .proc_handler = proc_dointvec,
4992 .procname = "force_tllao",
4993 .data = &ipv6_devconf.force_tllao,
4994 .maxlen = sizeof(int),
4996 .proc_handler = proc_dointvec
4999 .procname = "ndisc_notify",
5000 .data = &ipv6_devconf.ndisc_notify,
5001 .maxlen = sizeof(int),
5003 .proc_handler = proc_dointvec
5011 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
5012 struct inet6_dev *idev, struct ipv6_devconf *p)
5015 struct addrconf_sysctl_table *t;
5016 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
5018 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
5022 for (i = 0; t->addrconf_vars[i].data; i++) {
5023 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
5024 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
5025 t->addrconf_vars[i].extra2 = net;
5028 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
5030 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
5031 if (t->sysctl_header == NULL)
5043 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5045 struct addrconf_sysctl_table *t;
5047 if (p->sysctl == NULL)
5052 unregister_net_sysctl_table(t->sysctl_header);
5056 static void addrconf_sysctl_register(struct inet6_dev *idev)
5058 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
5059 &ndisc_ifinfo_sysctl_change);
5060 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
5064 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
5066 __addrconf_sysctl_unregister(&idev->cnf);
5067 neigh_sysctl_unregister(idev->nd_parms);
5073 static int __net_init addrconf_init_net(struct net *net)
5076 struct ipv6_devconf *all, *dflt;
5078 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
5082 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
5084 goto err_alloc_dflt;
5086 /* these will be inherited by all namespaces */
5087 dflt->autoconf = ipv6_defaults.autoconf;
5088 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
5090 net->ipv6.devconf_all = all;
5091 net->ipv6.devconf_dflt = dflt;
5093 #ifdef CONFIG_SYSCTL
5094 err = __addrconf_sysctl_register(net, "all", NULL, all);
5098 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
5104 #ifdef CONFIG_SYSCTL
5106 __addrconf_sysctl_unregister(all);
5116 static void __net_exit addrconf_exit_net(struct net *net)
5118 #ifdef CONFIG_SYSCTL
5119 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5120 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5122 if (!net_eq(net, &init_net)) {
5123 kfree(net->ipv6.devconf_dflt);
5124 kfree(net->ipv6.devconf_all);
5128 static struct pernet_operations addrconf_ops = {
5129 .init = addrconf_init_net,
5130 .exit = addrconf_exit_net,
5133 static struct rtnl_af_ops inet6_ops = {
5135 .fill_link_af = inet6_fill_link_af,
5136 .get_link_af_size = inet6_get_link_af_size,
5137 .set_link_af = inet6_set_link_af,
5141 * Init / cleanup code
5144 int __init addrconf_init(void)
5148 err = ipv6_addr_label_init();
5150 pr_crit("%s: cannot initialize default policy table: %d\n",
5155 err = register_pernet_subsys(&addrconf_ops);
5159 /* The addrconf netdev notifier requires that loopback_dev
5160 * has it's ipv6 private information allocated and setup
5161 * before it can bring up and give link-local addresses
5162 * to other devices which are up.
5164 * Unfortunately, loopback_dev is not necessarily the first
5165 * entry in the global dev_base list of net devices. In fact,
5166 * it is likely to be the very last entry on that list.
5167 * So this causes the notifier registry below to try and
5168 * give link-local addresses to all devices besides loopback_dev
5169 * first, then loopback_dev, which cases all the non-loopback_dev
5170 * devices to fail to get a link-local address.
5172 * So, as a temporary fix, allocate the ipv6 structure for
5173 * loopback_dev first by hand.
5174 * Longer term, all of the dependencies ipv6 has upon the loopback
5175 * device and it being up should be removed.
5178 if (!ipv6_add_dev(init_net.loopback_dev))
5184 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5185 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5187 register_netdevice_notifier(&ipv6_dev_notf);
5191 err = rtnl_af_register(&inet6_ops);
5195 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5200 /* Only the first call to __rtnl_register can fail */
5201 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5202 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5203 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5204 inet6_dump_ifaddr, NULL);
5205 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5206 inet6_dump_ifmcaddr, NULL);
5207 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5208 inet6_dump_ifacaddr, NULL);
5209 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
5210 inet6_netconf_dump_devconf, NULL);
5212 ipv6_addr_label_rtnl_register();
5216 rtnl_af_unregister(&inet6_ops);
5218 unregister_netdevice_notifier(&ipv6_dev_notf);
5220 unregister_pernet_subsys(&addrconf_ops);
5222 ipv6_addr_label_cleanup();
5227 void addrconf_cleanup(void)
5229 struct net_device *dev;
5232 unregister_netdevice_notifier(&ipv6_dev_notf);
5233 unregister_pernet_subsys(&addrconf_ops);
5234 ipv6_addr_label_cleanup();
5238 __rtnl_af_unregister(&inet6_ops);
5240 /* clean dev list */
5241 for_each_netdev(&init_net, dev) {
5242 if (__in6_dev_get(dev) == NULL)
5244 addrconf_ifdown(dev, 1);
5246 addrconf_ifdown(init_net.loopback_dev, 2);
5251 spin_lock_bh(&addrconf_hash_lock);
5252 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5253 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5254 spin_unlock_bh(&addrconf_hash_lock);
5256 del_timer(&addr_chk_timer);