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,
180 .mldv1_unsolicited_report_interval = 10 * HZ,
181 .mldv2_unsolicited_report_interval = HZ,
183 .rtr_solicits = MAX_RTR_SOLICITATIONS,
184 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
185 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
186 #ifdef CONFIG_IPV6_PRIVACY
188 .temp_valid_lft = TEMP_VALID_LIFETIME,
189 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
190 .regen_max_retry = REGEN_MAX_RETRY,
191 .max_desync_factor = MAX_DESYNC_FACTOR,
193 .max_addresses = IPV6_MAX_ADDRESSES,
194 .accept_ra_defrtr = 1,
195 .accept_ra_pinfo = 1,
196 #ifdef CONFIG_IPV6_ROUTER_PREF
197 .accept_ra_rtr_pref = 1,
198 .rtr_probe_interval = 60 * HZ,
199 #ifdef CONFIG_IPV6_ROUTE_INFO
200 .accept_ra_rt_info_max_plen = 0,
204 .accept_source_route = 0, /* we do not accept RH0 by default. */
209 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
211 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
212 .mtu6 = IPV6_MIN_MTU,
214 .accept_redirects = 1,
216 .force_mld_version = 0,
217 .mldv1_unsolicited_report_interval = 10 * HZ,
218 .mldv2_unsolicited_report_interval = HZ,
220 .rtr_solicits = MAX_RTR_SOLICITATIONS,
221 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
222 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
223 #ifdef CONFIG_IPV6_PRIVACY
225 .temp_valid_lft = TEMP_VALID_LIFETIME,
226 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
227 .regen_max_retry = REGEN_MAX_RETRY,
228 .max_desync_factor = MAX_DESYNC_FACTOR,
230 .max_addresses = IPV6_MAX_ADDRESSES,
231 .accept_ra_defrtr = 1,
232 .accept_ra_pinfo = 1,
233 #ifdef CONFIG_IPV6_ROUTER_PREF
234 .accept_ra_rtr_pref = 1,
235 .rtr_probe_interval = 60 * HZ,
236 #ifdef CONFIG_IPV6_ROUTE_INFO
237 .accept_ra_rt_info_max_plen = 0,
241 .accept_source_route = 0, /* we do not accept RH0 by default. */
246 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
247 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
248 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
249 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
250 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
251 const struct in6_addr in6addr_interfacelocal_allnodes = IN6ADDR_INTERFACELOCAL_ALLNODES_INIT;
252 const struct in6_addr in6addr_interfacelocal_allrouters = IN6ADDR_INTERFACELOCAL_ALLROUTERS_INIT;
253 const struct in6_addr in6addr_sitelocal_allrouters = IN6ADDR_SITELOCAL_ALLROUTERS_INIT;
255 /* Check if a valid qdisc is available */
256 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
258 return !qdisc_tx_is_noop(dev);
261 static void addrconf_del_rs_timer(struct inet6_dev *idev)
263 if (del_timer(&idev->rs_timer))
267 static void addrconf_del_dad_timer(struct inet6_ifaddr *ifp)
269 if (del_timer(&ifp->dad_timer))
273 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
276 if (!timer_pending(&idev->rs_timer))
278 mod_timer(&idev->rs_timer, jiffies + when);
281 static void addrconf_mod_dad_timer(struct inet6_ifaddr *ifp,
284 if (!timer_pending(&ifp->dad_timer))
286 mod_timer(&ifp->dad_timer, jiffies + when);
289 static int snmp6_alloc_dev(struct inet6_dev *idev)
291 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
292 sizeof(struct ipstats_mib),
293 __alignof__(struct ipstats_mib)) < 0)
295 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
297 if (!idev->stats.icmpv6dev)
299 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
301 if (!idev->stats.icmpv6msgdev)
307 kfree(idev->stats.icmpv6dev);
309 snmp_mib_free((void __percpu **)idev->stats.ipv6);
314 static void snmp6_free_dev(struct inet6_dev *idev)
316 kfree(idev->stats.icmpv6msgdev);
317 kfree(idev->stats.icmpv6dev);
318 snmp_mib_free((void __percpu **)idev->stats.ipv6);
321 /* Nobody refers to this device, we may destroy it. */
323 void in6_dev_finish_destroy(struct inet6_dev *idev)
325 struct net_device *dev = idev->dev;
327 WARN_ON(!list_empty(&idev->addr_list));
328 WARN_ON(idev->mc_list != NULL);
329 WARN_ON(timer_pending(&idev->rs_timer));
331 #ifdef NET_REFCNT_DEBUG
332 pr_debug("%s: %s\n", __func__, dev ? dev->name : "NIL");
336 pr_warn("Freeing alive inet6 device %p\n", idev);
339 snmp6_free_dev(idev);
340 kfree_rcu(idev, rcu);
342 EXPORT_SYMBOL(in6_dev_finish_destroy);
344 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
346 struct inet6_dev *ndev;
350 if (dev->mtu < IPV6_MIN_MTU)
353 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
358 rwlock_init(&ndev->lock);
360 INIT_LIST_HEAD(&ndev->addr_list);
361 setup_timer(&ndev->rs_timer, addrconf_rs_timer,
362 (unsigned long)ndev);
363 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
364 ndev->cnf.mtu6 = dev->mtu;
365 ndev->cnf.sysctl = NULL;
366 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
367 if (ndev->nd_parms == NULL) {
371 if (ndev->cnf.forwarding)
372 dev_disable_lro(dev);
373 /* We refer to the device */
376 if (snmp6_alloc_dev(ndev) < 0) {
378 "%s: cannot allocate memory for statistics; dev=%s.\n",
379 __func__, dev->name));
380 neigh_parms_release(&nd_tbl, ndev->nd_parms);
386 if (snmp6_register_dev(ndev) < 0) {
388 "%s: cannot create /proc/net/dev_snmp6/%s\n",
389 __func__, dev->name));
390 neigh_parms_release(&nd_tbl, ndev->nd_parms);
392 in6_dev_finish_destroy(ndev);
396 /* One reference from device. We must do this before
397 * we invoke __ipv6_regen_rndid().
401 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
402 ndev->cnf.accept_dad = -1;
404 #if IS_ENABLED(CONFIG_IPV6_SIT)
405 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
406 pr_info("%s: Disabled Multicast RS\n", dev->name);
407 ndev->cnf.rtr_solicits = 0;
411 #ifdef CONFIG_IPV6_PRIVACY
412 INIT_LIST_HEAD(&ndev->tempaddr_list);
413 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
414 if ((dev->flags&IFF_LOOPBACK) ||
415 dev->type == ARPHRD_TUNNEL ||
416 dev->type == ARPHRD_TUNNEL6 ||
417 dev->type == ARPHRD_SIT ||
418 dev->type == ARPHRD_NONE) {
419 ndev->cnf.use_tempaddr = -1;
422 ipv6_regen_rndid((unsigned long) ndev);
425 ndev->token = in6addr_any;
427 if (netif_running(dev) && addrconf_qdisc_ok(dev))
428 ndev->if_flags |= IF_READY;
430 ipv6_mc_init_dev(ndev);
431 ndev->tstamp = jiffies;
432 addrconf_sysctl_register(ndev);
433 /* protected by rtnl_lock */
434 rcu_assign_pointer(dev->ip6_ptr, ndev);
436 /* Join interface-local all-node multicast group */
437 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
439 /* Join all-node multicast group */
440 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
442 /* Join all-router multicast group if forwarding is set */
443 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
444 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
449 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
451 struct inet6_dev *idev;
455 idev = __in6_dev_get(dev);
457 idev = ipv6_add_dev(dev);
462 if (dev->flags&IFF_UP)
467 static int inet6_netconf_msgsize_devconf(int type)
469 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
470 + nla_total_size(4); /* NETCONFA_IFINDEX */
472 /* type -1 is used for ALL */
473 if (type == -1 || type == NETCONFA_FORWARDING)
474 size += nla_total_size(4);
475 #ifdef CONFIG_IPV6_MROUTE
476 if (type == -1 || type == NETCONFA_MC_FORWARDING)
477 size += nla_total_size(4);
483 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
484 struct ipv6_devconf *devconf, u32 portid,
485 u32 seq, int event, unsigned int flags,
488 struct nlmsghdr *nlh;
489 struct netconfmsg *ncm;
491 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
496 ncm = nlmsg_data(nlh);
497 ncm->ncm_family = AF_INET6;
499 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
500 goto nla_put_failure;
502 /* type -1 is used for ALL */
503 if ((type == -1 || type == NETCONFA_FORWARDING) &&
504 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
505 goto nla_put_failure;
506 #ifdef CONFIG_IPV6_MROUTE
507 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
508 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
509 devconf->mc_forwarding) < 0)
510 goto nla_put_failure;
512 return nlmsg_end(skb, nlh);
515 nlmsg_cancel(skb, nlh);
519 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
520 struct ipv6_devconf *devconf)
525 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
529 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
530 RTM_NEWNETCONF, 0, type);
532 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
533 WARN_ON(err == -EMSGSIZE);
537 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
540 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
543 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
544 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
545 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
548 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
549 struct nlmsghdr *nlh)
551 struct net *net = sock_net(in_skb->sk);
552 struct nlattr *tb[NETCONFA_MAX+1];
553 struct netconfmsg *ncm;
555 struct ipv6_devconf *devconf;
556 struct inet6_dev *in6_dev;
557 struct net_device *dev;
561 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
562 devconf_ipv6_policy);
567 if (!tb[NETCONFA_IFINDEX])
570 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
572 case NETCONFA_IFINDEX_ALL:
573 devconf = net->ipv6.devconf_all;
575 case NETCONFA_IFINDEX_DEFAULT:
576 devconf = net->ipv6.devconf_dflt;
579 dev = __dev_get_by_index(net, ifindex);
582 in6_dev = __in6_dev_get(dev);
585 devconf = &in6_dev->cnf;
590 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
594 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
595 NETLINK_CB(in_skb).portid,
596 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
599 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
600 WARN_ON(err == -EMSGSIZE);
604 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
609 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
610 struct netlink_callback *cb)
612 struct net *net = sock_net(skb->sk);
615 struct net_device *dev;
616 struct inet6_dev *idev;
617 struct hlist_head *head;
620 s_idx = idx = cb->args[1];
622 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
624 head = &net->dev_index_head[h];
626 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
628 hlist_for_each_entry_rcu(dev, head, index_hlist) {
631 idev = __in6_dev_get(dev);
635 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
637 NETLINK_CB(cb->skb).portid,
645 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
651 if (h == NETDEV_HASHENTRIES) {
652 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
653 net->ipv6.devconf_all,
654 NETLINK_CB(cb->skb).portid,
656 RTM_NEWNETCONF, NLM_F_MULTI,
662 if (h == NETDEV_HASHENTRIES + 1) {
663 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
664 net->ipv6.devconf_dflt,
665 NETLINK_CB(cb->skb).portid,
667 RTM_NEWNETCONF, NLM_F_MULTI,
681 static void dev_forward_change(struct inet6_dev *idev)
683 struct net_device *dev;
684 struct inet6_ifaddr *ifa;
689 if (idev->cnf.forwarding)
690 dev_disable_lro(dev);
691 if (dev->flags & IFF_MULTICAST) {
692 if (idev->cnf.forwarding) {
693 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
694 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
695 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
697 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
698 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
699 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
703 list_for_each_entry(ifa, &idev->addr_list, if_list) {
704 if (ifa->flags&IFA_F_TENTATIVE)
706 if (idev->cnf.forwarding)
707 addrconf_join_anycast(ifa);
709 addrconf_leave_anycast(ifa);
711 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
712 dev->ifindex, &idev->cnf);
716 static void addrconf_forward_change(struct net *net, __s32 newf)
718 struct net_device *dev;
719 struct inet6_dev *idev;
721 for_each_netdev(net, dev) {
722 idev = __in6_dev_get(dev);
724 int changed = (!idev->cnf.forwarding) ^ (!newf);
725 idev->cnf.forwarding = newf;
727 dev_forward_change(idev);
732 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
738 return restart_syscall();
740 net = (struct net *)table->extra2;
744 if (p == &net->ipv6.devconf_dflt->forwarding) {
745 if ((!newf) ^ (!old))
746 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
747 NETCONFA_IFINDEX_DEFAULT,
748 net->ipv6.devconf_dflt);
753 if (p == &net->ipv6.devconf_all->forwarding) {
754 net->ipv6.devconf_dflt->forwarding = newf;
755 addrconf_forward_change(net, newf);
756 if ((!newf) ^ (!old))
757 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
758 NETCONFA_IFINDEX_ALL,
759 net->ipv6.devconf_all);
760 } else if ((!newf) ^ (!old))
761 dev_forward_change((struct inet6_dev *)table->extra1);
765 rt6_purge_dflt_routers(net);
770 /* Nobody refers to this ifaddr, destroy it */
771 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
773 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
775 #ifdef NET_REFCNT_DEBUG
776 pr_debug("%s\n", __func__);
779 in6_dev_put(ifp->idev);
781 if (del_timer(&ifp->dad_timer))
782 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
784 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
785 pr_warn("Freeing alive inet6 address %p\n", ifp);
794 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
797 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
800 * Each device address list is sorted in order of scope -
801 * global before linklocal.
803 list_for_each(p, &idev->addr_list) {
804 struct inet6_ifaddr *ifa
805 = list_entry(p, struct inet6_ifaddr, if_list);
806 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
810 list_add_tail(&ifp->if_list, p);
813 static u32 inet6_addr_hash(const struct in6_addr *addr)
815 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
818 /* On success it returns ifp with increased reference count */
820 static struct inet6_ifaddr *
821 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
822 const struct in6_addr *peer_addr, int pfxlen,
823 int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
825 struct inet6_ifaddr *ifa = NULL;
829 int addr_type = ipv6_addr_type(addr);
831 if (addr_type == IPV6_ADDR_ANY ||
832 addr_type & IPV6_ADDR_MULTICAST ||
833 (!(idev->dev->flags & IFF_LOOPBACK) &&
834 addr_type & IPV6_ADDR_LOOPBACK))
835 return ERR_PTR(-EADDRNOTAVAIL);
839 err = -ENODEV; /*XXX*/
843 if (idev->cnf.disable_ipv6) {
848 spin_lock(&addrconf_hash_lock);
850 /* Ignore adding duplicate addresses on an interface */
851 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
852 ADBG(("ipv6_add_addr: already assigned\n"));
857 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
860 ADBG(("ipv6_add_addr: malloc failed\n"));
865 rt = addrconf_dst_alloc(idev, addr, false);
873 ifa->peer_addr = *peer_addr;
875 spin_lock_init(&ifa->lock);
876 spin_lock_init(&ifa->state_lock);
877 setup_timer(&ifa->dad_timer, addrconf_dad_timer,
879 INIT_HLIST_NODE(&ifa->addr_lst);
881 ifa->prefix_len = pfxlen;
882 ifa->flags = flags | IFA_F_TENTATIVE;
883 ifa->valid_lft = valid_lft;
884 ifa->prefered_lft = prefered_lft;
885 ifa->cstamp = ifa->tstamp = jiffies;
886 ifa->tokenized = false;
895 /* Add to big hash table */
896 hash = inet6_addr_hash(addr);
898 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
899 spin_unlock(&addrconf_hash_lock);
901 write_lock(&idev->lock);
902 /* Add to inet6_dev unicast addr list. */
903 ipv6_link_dev_addr(idev, ifa);
905 #ifdef CONFIG_IPV6_PRIVACY
906 if (ifa->flags&IFA_F_TEMPORARY) {
907 list_add(&ifa->tmp_list, &idev->tempaddr_list);
913 write_unlock(&idev->lock);
915 rcu_read_unlock_bh();
917 if (likely(err == 0))
918 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
926 spin_unlock(&addrconf_hash_lock);
930 /* This function wants to get referenced ifp and releases it before return */
932 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
934 struct inet6_ifaddr *ifa, *ifn;
935 struct inet6_dev *idev = ifp->idev;
937 int deleted = 0, onlink = 0;
938 unsigned long expires = jiffies;
940 spin_lock_bh(&ifp->state_lock);
942 ifp->state = INET6_IFADDR_STATE_DEAD;
943 spin_unlock_bh(&ifp->state_lock);
945 if (state == INET6_IFADDR_STATE_DEAD)
948 spin_lock_bh(&addrconf_hash_lock);
949 hlist_del_init_rcu(&ifp->addr_lst);
950 spin_unlock_bh(&addrconf_hash_lock);
952 write_lock_bh(&idev->lock);
953 #ifdef CONFIG_IPV6_PRIVACY
954 if (ifp->flags&IFA_F_TEMPORARY) {
955 list_del(&ifp->tmp_list);
957 in6_ifa_put(ifp->ifpub);
964 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
966 list_del_init(&ifp->if_list);
969 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
973 } else if (ifp->flags & IFA_F_PERMANENT) {
974 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
976 if (ifa->flags & IFA_F_PERMANENT) {
981 unsigned long lifetime;
986 spin_lock(&ifa->lock);
988 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
990 * Note: Because this address is
991 * not permanent, lifetime <
992 * LONG_MAX / HZ here.
994 if (time_before(expires,
995 ifa->tstamp + lifetime * HZ))
996 expires = ifa->tstamp + lifetime * HZ;
997 spin_unlock(&ifa->lock);
1002 write_unlock_bh(&idev->lock);
1004 addrconf_del_dad_timer(ifp);
1006 ipv6_ifa_notify(RTM_DELADDR, ifp);
1008 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1011 * Purge or update corresponding prefix
1013 * 1) we don't purge prefix here if address was not permanent.
1014 * prefix is managed by its own lifetime.
1015 * 2) if there're no addresses, delete prefix.
1016 * 3) if there're still other permanent address(es),
1017 * corresponding prefix is still permanent.
1018 * 4) otherwise, update prefix lifetime to the
1019 * longest valid lifetime among the corresponding
1020 * addresses on the device.
1021 * Note: subsequent RA will update lifetime.
1025 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
1026 struct in6_addr prefix;
1027 struct rt6_info *rt;
1029 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
1031 rt = addrconf_get_prefix_route(&prefix,
1034 0, RTF_GATEWAY | RTF_DEFAULT);
1040 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
1041 rt6_set_expires(rt, expires);
1047 /* clean up prefsrc entries */
1048 rt6_remove_prefsrc(ifp);
1053 #ifdef CONFIG_IPV6_PRIVACY
1054 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1056 struct inet6_dev *idev = ifp->idev;
1057 struct in6_addr addr, *tmpaddr;
1058 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1059 unsigned long regen_advance;
1064 unsigned long now = jiffies;
1066 write_lock(&idev->lock);
1068 spin_lock_bh(&ift->lock);
1069 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1070 spin_unlock_bh(&ift->lock);
1077 if (idev->cnf.use_tempaddr <= 0) {
1078 write_unlock(&idev->lock);
1079 pr_info("%s: use_tempaddr is disabled\n", __func__);
1084 spin_lock_bh(&ifp->lock);
1085 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1086 idev->cnf.use_tempaddr = -1; /*XXX*/
1087 spin_unlock_bh(&ifp->lock);
1088 write_unlock(&idev->lock);
1089 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1096 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1097 __ipv6_try_regen_rndid(idev, tmpaddr);
1098 memcpy(&addr.s6_addr[8], idev->rndid, 8);
1099 age = (now - ifp->tstamp) / HZ;
1100 tmp_valid_lft = min_t(__u32,
1102 idev->cnf.temp_valid_lft + age);
1103 tmp_prefered_lft = min_t(__u32,
1105 idev->cnf.temp_prefered_lft + age -
1106 idev->cnf.max_desync_factor);
1107 tmp_plen = ifp->prefix_len;
1108 max_addresses = idev->cnf.max_addresses;
1109 tmp_tstamp = ifp->tstamp;
1110 spin_unlock_bh(&ifp->lock);
1112 regen_advance = idev->cnf.regen_max_retry *
1113 idev->cnf.dad_transmits *
1114 idev->nd_parms->retrans_time / HZ;
1115 write_unlock(&idev->lock);
1117 /* A temporary address is created only if this calculated Preferred
1118 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1119 * an implementation must not create a temporary address with a zero
1120 * Preferred Lifetime.
1122 if (tmp_prefered_lft <= regen_advance) {
1129 addr_flags = IFA_F_TEMPORARY;
1130 /* set in addrconf_prefix_rcv() */
1131 if (ifp->flags & IFA_F_OPTIMISTIC)
1132 addr_flags |= IFA_F_OPTIMISTIC;
1134 ift = !max_addresses ||
1135 ipv6_count_addresses(idev) < max_addresses ?
1136 ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1137 ipv6_addr_scope(&addr), addr_flags,
1138 tmp_valid_lft, tmp_prefered_lft) : NULL;
1139 if (IS_ERR_OR_NULL(ift)) {
1142 pr_info("%s: retry temporary address regeneration\n", __func__);
1144 write_lock(&idev->lock);
1148 spin_lock_bh(&ift->lock);
1151 ift->tstamp = tmp_tstamp;
1152 spin_unlock_bh(&ift->lock);
1154 addrconf_dad_start(ift);
1163 * Choose an appropriate source address (RFC3484)
1166 IPV6_SADDR_RULE_INIT = 0,
1167 IPV6_SADDR_RULE_LOCAL,
1168 IPV6_SADDR_RULE_SCOPE,
1169 IPV6_SADDR_RULE_PREFERRED,
1170 #ifdef CONFIG_IPV6_MIP6
1171 IPV6_SADDR_RULE_HOA,
1173 IPV6_SADDR_RULE_OIF,
1174 IPV6_SADDR_RULE_LABEL,
1175 #ifdef CONFIG_IPV6_PRIVACY
1176 IPV6_SADDR_RULE_PRIVACY,
1178 IPV6_SADDR_RULE_ORCHID,
1179 IPV6_SADDR_RULE_PREFIX,
1183 struct ipv6_saddr_score {
1186 struct inet6_ifaddr *ifa;
1187 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1192 struct ipv6_saddr_dst {
1193 const struct in6_addr *addr;
1200 static inline int ipv6_saddr_preferred(int type)
1202 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1207 static int ipv6_get_saddr_eval(struct net *net,
1208 struct ipv6_saddr_score *score,
1209 struct ipv6_saddr_dst *dst,
1214 if (i <= score->rule) {
1216 case IPV6_SADDR_RULE_SCOPE:
1217 ret = score->scopedist;
1219 case IPV6_SADDR_RULE_PREFIX:
1220 ret = score->matchlen;
1223 ret = !!test_bit(i, score->scorebits);
1229 case IPV6_SADDR_RULE_INIT:
1230 /* Rule 0: remember if hiscore is not ready yet */
1233 case IPV6_SADDR_RULE_LOCAL:
1234 /* Rule 1: Prefer same address */
1235 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1237 case IPV6_SADDR_RULE_SCOPE:
1238 /* Rule 2: Prefer appropriate scope
1243 * ---+--+-+---> scope
1245 * | d is scope of the destination.
1247 * | \ <- smaller scope is better if
1248 * B-15 | \ if scope is enough for destinaion.
1249 * | ret = B - scope (-1 <= scope >= d <= 15).
1251 * |/ <- greater is better
1252 * -C / if scope is not enough for destination.
1253 * /| ret = scope - C (-1 <= d < scope <= 15).
1255 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1256 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1257 * Assume B = 0 and we get C > 29.
1259 ret = __ipv6_addr_src_scope(score->addr_type);
1260 if (ret >= dst->scope)
1263 ret -= 128; /* 30 is enough */
1264 score->scopedist = ret;
1266 case IPV6_SADDR_RULE_PREFERRED:
1267 /* Rule 3: Avoid deprecated and optimistic addresses */
1268 ret = ipv6_saddr_preferred(score->addr_type) ||
1269 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1271 #ifdef CONFIG_IPV6_MIP6
1272 case IPV6_SADDR_RULE_HOA:
1274 /* Rule 4: Prefer home address */
1275 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1276 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1280 case IPV6_SADDR_RULE_OIF:
1281 /* Rule 5: Prefer outgoing interface */
1282 ret = (!dst->ifindex ||
1283 dst->ifindex == score->ifa->idev->dev->ifindex);
1285 case IPV6_SADDR_RULE_LABEL:
1286 /* Rule 6: Prefer matching label */
1287 ret = ipv6_addr_label(net,
1288 &score->ifa->addr, score->addr_type,
1289 score->ifa->idev->dev->ifindex) == dst->label;
1291 #ifdef CONFIG_IPV6_PRIVACY
1292 case IPV6_SADDR_RULE_PRIVACY:
1294 /* Rule 7: Prefer public address
1295 * Note: prefer temporary address if use_tempaddr >= 2
1297 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1298 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1299 score->ifa->idev->cnf.use_tempaddr >= 2;
1300 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1304 case IPV6_SADDR_RULE_ORCHID:
1305 /* Rule 8-: Prefer ORCHID vs ORCHID or
1306 * non-ORCHID vs non-ORCHID
1308 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1309 ipv6_addr_orchid(dst->addr));
1311 case IPV6_SADDR_RULE_PREFIX:
1312 /* Rule 8: Use longest matching prefix */
1313 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1314 if (ret > score->ifa->prefix_len)
1315 ret = score->ifa->prefix_len;
1316 score->matchlen = ret;
1323 __set_bit(i, score->scorebits);
1329 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1330 const struct in6_addr *daddr, unsigned int prefs,
1331 struct in6_addr *saddr)
1333 struct ipv6_saddr_score scores[2],
1334 *score = &scores[0], *hiscore = &scores[1];
1335 struct ipv6_saddr_dst dst;
1336 struct net_device *dev;
1339 dst_type = __ipv6_addr_type(daddr);
1341 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1342 dst.scope = __ipv6_addr_src_scope(dst_type);
1343 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1347 hiscore->ifa = NULL;
1351 for_each_netdev_rcu(net, dev) {
1352 struct inet6_dev *idev;
1354 /* Candidate Source Address (section 4)
1355 * - multicast and link-local destination address,
1356 * the set of candidate source address MUST only
1357 * include addresses assigned to interfaces
1358 * belonging to the same link as the outgoing
1360 * (- For site-local destination addresses, the
1361 * set of candidate source addresses MUST only
1362 * include addresses assigned to interfaces
1363 * belonging to the same site as the outgoing
1366 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1367 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1368 dst.ifindex && dev->ifindex != dst.ifindex)
1371 idev = __in6_dev_get(dev);
1375 read_lock_bh(&idev->lock);
1376 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1380 * - Tentative Address (RFC2462 section 5.4)
1381 * - A tentative address is not considered
1382 * "assigned to an interface" in the traditional
1383 * sense, unless it is also flagged as optimistic.
1384 * - Candidate Source Address (section 4)
1385 * - In any case, anycast addresses, multicast
1386 * addresses, and the unspecified address MUST
1387 * NOT be included in a candidate set.
1389 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1390 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1393 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1395 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1396 score->addr_type & IPV6_ADDR_MULTICAST)) {
1397 LIMIT_NETDEBUG(KERN_DEBUG
1398 "ADDRCONF: unspecified / multicast address "
1399 "assigned as unicast address on %s",
1405 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1407 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1408 int minihiscore, miniscore;
1410 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1411 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1413 if (minihiscore > miniscore) {
1414 if (i == IPV6_SADDR_RULE_SCOPE &&
1415 score->scopedist > 0) {
1418 * each remaining entry
1419 * has too small (not enough)
1420 * scope, because ifa entries
1421 * are sorted by their scope
1427 } else if (minihiscore < miniscore) {
1429 in6_ifa_put(hiscore->ifa);
1431 in6_ifa_hold(score->ifa);
1433 swap(hiscore, score);
1435 /* restore our iterator */
1436 score->ifa = hiscore->ifa;
1443 read_unlock_bh(&idev->lock);
1448 return -EADDRNOTAVAIL;
1450 *saddr = hiscore->ifa->addr;
1451 in6_ifa_put(hiscore->ifa);
1454 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1456 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1457 unsigned char banned_flags)
1459 struct inet6_ifaddr *ifp;
1460 int err = -EADDRNOTAVAIL;
1462 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1463 if (ifp->scope == IFA_LINK &&
1464 !(ifp->flags & banned_flags)) {
1473 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1474 unsigned char banned_flags)
1476 struct inet6_dev *idev;
1477 int err = -EADDRNOTAVAIL;
1480 idev = __in6_dev_get(dev);
1482 read_lock_bh(&idev->lock);
1483 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1484 read_unlock_bh(&idev->lock);
1490 static int ipv6_count_addresses(struct inet6_dev *idev)
1493 struct inet6_ifaddr *ifp;
1495 read_lock_bh(&idev->lock);
1496 list_for_each_entry(ifp, &idev->addr_list, if_list)
1498 read_unlock_bh(&idev->lock);
1502 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1503 const struct net_device *dev, int strict)
1505 struct inet6_ifaddr *ifp;
1506 unsigned int hash = inet6_addr_hash(addr);
1509 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1510 if (!net_eq(dev_net(ifp->idev->dev), net))
1512 if (ipv6_addr_equal(&ifp->addr, addr) &&
1513 !(ifp->flags&IFA_F_TENTATIVE) &&
1514 (dev == NULL || ifp->idev->dev == dev ||
1515 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1516 rcu_read_unlock_bh();
1521 rcu_read_unlock_bh();
1524 EXPORT_SYMBOL(ipv6_chk_addr);
1526 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1527 struct net_device *dev)
1529 unsigned int hash = inet6_addr_hash(addr);
1530 struct inet6_ifaddr *ifp;
1532 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1533 if (!net_eq(dev_net(ifp->idev->dev), net))
1535 if (ipv6_addr_equal(&ifp->addr, addr)) {
1536 if (dev == NULL || ifp->idev->dev == dev)
1543 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1545 struct inet6_dev *idev;
1546 struct inet6_ifaddr *ifa;
1551 idev = __in6_dev_get(dev);
1553 read_lock_bh(&idev->lock);
1554 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1555 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1560 read_unlock_bh(&idev->lock);
1565 EXPORT_SYMBOL(ipv6_chk_prefix);
1567 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1568 struct net_device *dev, int strict)
1570 struct inet6_ifaddr *ifp, *result = NULL;
1571 unsigned int hash = inet6_addr_hash(addr);
1574 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1575 if (!net_eq(dev_net(ifp->idev->dev), net))
1577 if (ipv6_addr_equal(&ifp->addr, addr)) {
1578 if (dev == NULL || ifp->idev->dev == dev ||
1579 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1586 rcu_read_unlock_bh();
1591 /* Gets referenced address, destroys ifaddr */
1593 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1595 if (ifp->flags&IFA_F_PERMANENT) {
1596 spin_lock_bh(&ifp->lock);
1597 addrconf_del_dad_timer(ifp);
1598 ifp->flags |= IFA_F_TENTATIVE;
1600 ifp->flags |= IFA_F_DADFAILED;
1601 spin_unlock_bh(&ifp->lock);
1603 ipv6_ifa_notify(0, ifp);
1605 #ifdef CONFIG_IPV6_PRIVACY
1606 } else if (ifp->flags&IFA_F_TEMPORARY) {
1607 struct inet6_ifaddr *ifpub;
1608 spin_lock_bh(&ifp->lock);
1611 in6_ifa_hold(ifpub);
1612 spin_unlock_bh(&ifp->lock);
1613 ipv6_create_tempaddr(ifpub, ifp);
1616 spin_unlock_bh(&ifp->lock);
1624 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1628 spin_lock(&ifp->state_lock);
1629 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1630 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1633 spin_unlock(&ifp->state_lock);
1638 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1640 struct inet6_dev *idev = ifp->idev;
1642 if (addrconf_dad_end(ifp)) {
1647 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1648 ifp->idev->dev->name, &ifp->addr);
1650 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1651 struct in6_addr addr;
1653 addr.s6_addr32[0] = htonl(0xfe800000);
1654 addr.s6_addr32[1] = 0;
1656 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1657 ipv6_addr_equal(&ifp->addr, &addr)) {
1658 /* DAD failed for link-local based on MAC address */
1659 idev->cnf.disable_ipv6 = 1;
1661 pr_info("%s: IPv6 being disabled!\n",
1662 ifp->idev->dev->name);
1666 addrconf_dad_stop(ifp, 1);
1669 /* Join to solicited addr multicast group. */
1671 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1673 struct in6_addr maddr;
1675 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1678 addrconf_addr_solict_mult(addr, &maddr);
1679 ipv6_dev_mc_inc(dev, &maddr);
1682 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1684 struct in6_addr maddr;
1686 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1689 addrconf_addr_solict_mult(addr, &maddr);
1690 __ipv6_dev_mc_dec(idev, &maddr);
1693 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1695 struct in6_addr addr;
1696 if (ifp->prefix_len == 127) /* RFC 6164 */
1698 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1699 if (ipv6_addr_any(&addr))
1701 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1704 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1706 struct in6_addr addr;
1707 if (ifp->prefix_len == 127) /* RFC 6164 */
1709 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1710 if (ipv6_addr_any(&addr))
1712 __ipv6_dev_ac_dec(ifp->idev, &addr);
1715 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1717 if (dev->addr_len != ETH_ALEN)
1719 memcpy(eui, dev->dev_addr, 3);
1720 memcpy(eui + 5, dev->dev_addr + 3, 3);
1723 * The zSeries OSA network cards can be shared among various
1724 * OS instances, but the OSA cards have only one MAC address.
1725 * This leads to duplicate address conflicts in conjunction
1726 * with IPv6 if more than one instance uses the same card.
1728 * The driver for these cards can deliver a unique 16-bit
1729 * identifier for each instance sharing the same card. It is
1730 * placed instead of 0xFFFE in the interface identifier. The
1731 * "u" bit of the interface identifier is not inverted in this
1732 * case. Hence the resulting interface identifier has local
1733 * scope according to RFC2373.
1736 eui[3] = (dev->dev_id >> 8) & 0xFF;
1737 eui[4] = dev->dev_id & 0xFF;
1746 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1748 if (dev->addr_len != IEEE802154_ADDR_LEN)
1750 memcpy(eui, dev->dev_addr, 8);
1755 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1757 union fwnet_hwaddr *ha;
1759 if (dev->addr_len != FWNET_ALEN)
1762 ha = (union fwnet_hwaddr *)dev->dev_addr;
1764 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1769 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1771 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1772 if (dev->addr_len != ARCNET_ALEN)
1775 eui[7] = *(u8 *)dev->dev_addr;
1779 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1781 if (dev->addr_len != INFINIBAND_ALEN)
1783 memcpy(eui, dev->dev_addr + 12, 8);
1788 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1792 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1793 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1794 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1795 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1796 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1797 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1801 memcpy(eui + 4, &addr, 4);
1805 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1807 if (dev->priv_flags & IFF_ISATAP)
1808 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1812 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1814 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1817 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1819 switch (dev->type) {
1822 return addrconf_ifid_eui48(eui, dev);
1824 return addrconf_ifid_arcnet(eui, dev);
1825 case ARPHRD_INFINIBAND:
1826 return addrconf_ifid_infiniband(eui, dev);
1828 return addrconf_ifid_sit(eui, dev);
1830 return addrconf_ifid_gre(eui, dev);
1831 case ARPHRD_IEEE802154:
1832 return addrconf_ifid_eui64(eui, dev);
1833 case ARPHRD_IEEE1394:
1834 return addrconf_ifid_ieee1394(eui, dev);
1839 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1842 struct inet6_ifaddr *ifp;
1844 read_lock_bh(&idev->lock);
1845 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1846 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1847 memcpy(eui, ifp->addr.s6_addr+8, 8);
1852 read_unlock_bh(&idev->lock);
1856 #ifdef CONFIG_IPV6_PRIVACY
1857 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1858 static void __ipv6_regen_rndid(struct inet6_dev *idev)
1861 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1862 idev->rndid[0] &= ~0x02;
1865 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1866 * check if generated address is not inappropriate
1868 * - Reserved subnet anycast (RFC 2526)
1869 * 11111101 11....11 1xxxxxxx
1870 * - ISATAP (RFC4214) 6.1
1871 * 00-00-5E-FE-xx-xx-xx-xx
1873 * - XXX: already assigned to an address on the device
1875 if (idev->rndid[0] == 0xfd &&
1876 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1877 (idev->rndid[7]&0x80))
1879 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1880 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1882 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1887 static void ipv6_regen_rndid(unsigned long data)
1889 struct inet6_dev *idev = (struct inet6_dev *) data;
1890 unsigned long expires;
1893 write_lock_bh(&idev->lock);
1898 __ipv6_regen_rndid(idev);
1901 idev->cnf.temp_prefered_lft * HZ -
1902 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1903 idev->cnf.max_desync_factor * HZ;
1904 if (time_before(expires, jiffies)) {
1905 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
1906 __func__, idev->dev->name);
1910 if (!mod_timer(&idev->regen_timer, expires))
1914 write_unlock_bh(&idev->lock);
1915 rcu_read_unlock_bh();
1919 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
1921 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1922 __ipv6_regen_rndid(idev);
1931 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1932 unsigned long expires, u32 flags)
1934 struct fib6_config cfg = {
1935 .fc_table = RT6_TABLE_PREFIX,
1936 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1937 .fc_ifindex = dev->ifindex,
1938 .fc_expires = expires,
1940 .fc_flags = RTF_UP | flags,
1941 .fc_nlinfo.nl_net = dev_net(dev),
1942 .fc_protocol = RTPROT_KERNEL,
1947 /* Prevent useless cloning on PtP SIT.
1948 This thing is done here expecting that the whole
1949 class of non-broadcast devices need not cloning.
1951 #if IS_ENABLED(CONFIG_IPV6_SIT)
1952 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1953 cfg.fc_flags |= RTF_NONEXTHOP;
1956 ip6_route_add(&cfg);
1960 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
1962 const struct net_device *dev,
1963 u32 flags, u32 noflags)
1965 struct fib6_node *fn;
1966 struct rt6_info *rt = NULL;
1967 struct fib6_table *table;
1969 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
1973 read_lock_bh(&table->tb6_lock);
1974 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
1977 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1978 if (rt->dst.dev->ifindex != dev->ifindex)
1980 if ((rt->rt6i_flags & flags) != flags)
1982 if ((rt->rt6i_flags & noflags) != 0)
1988 read_unlock_bh(&table->tb6_lock);
1993 /* Create "default" multicast route to the interface */
1995 static void addrconf_add_mroute(struct net_device *dev)
1997 struct fib6_config cfg = {
1998 .fc_table = RT6_TABLE_LOCAL,
1999 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2000 .fc_ifindex = dev->ifindex,
2003 .fc_nlinfo.nl_net = dev_net(dev),
2006 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2008 ip6_route_add(&cfg);
2011 #if IS_ENABLED(CONFIG_IPV6_SIT)
2012 static void sit_route_add(struct net_device *dev)
2014 struct fib6_config cfg = {
2015 .fc_table = RT6_TABLE_MAIN,
2016 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2017 .fc_ifindex = dev->ifindex,
2019 .fc_flags = RTF_UP | RTF_NONEXTHOP,
2020 .fc_nlinfo.nl_net = dev_net(dev),
2023 /* prefix length - 96 bits "::d.d.d.d" */
2024 ip6_route_add(&cfg);
2028 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2030 struct inet6_dev *idev;
2034 idev = ipv6_find_idev(dev);
2036 return ERR_PTR(-ENOBUFS);
2038 if (idev->cnf.disable_ipv6)
2039 return ERR_PTR(-EACCES);
2041 /* Add default multicast route */
2042 if (!(dev->flags & IFF_LOOPBACK))
2043 addrconf_add_mroute(dev);
2048 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2050 struct prefix_info *pinfo;
2054 struct inet6_dev *in6_dev;
2055 struct net *net = dev_net(dev);
2057 pinfo = (struct prefix_info *) opt;
2059 if (len < sizeof(struct prefix_info)) {
2060 ADBG(("addrconf: prefix option too short\n"));
2065 * Validation checks ([ADDRCONF], page 19)
2068 addr_type = ipv6_addr_type(&pinfo->prefix);
2070 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2073 valid_lft = ntohl(pinfo->valid);
2074 prefered_lft = ntohl(pinfo->prefered);
2076 if (prefered_lft > valid_lft) {
2077 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2081 in6_dev = in6_dev_get(dev);
2083 if (in6_dev == NULL) {
2084 net_dbg_ratelimited("addrconf: device %s not configured\n",
2090 * Two things going on here:
2091 * 1) Add routes for on-link prefixes
2092 * 2) Configure prefixes with the auto flag set
2095 if (pinfo->onlink) {
2096 struct rt6_info *rt;
2097 unsigned long rt_expires;
2099 /* Avoid arithmetic overflow. Really, we could
2100 * save rt_expires in seconds, likely valid_lft,
2101 * but it would require division in fib gc, that it
2105 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2107 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2109 if (addrconf_finite_timeout(rt_expires))
2112 rt = addrconf_get_prefix_route(&pinfo->prefix,
2115 RTF_ADDRCONF | RTF_PREFIX_RT,
2116 RTF_GATEWAY | RTF_DEFAULT);
2119 /* Autoconf prefix route */
2120 if (valid_lft == 0) {
2123 } else if (addrconf_finite_timeout(rt_expires)) {
2125 rt6_set_expires(rt, jiffies + rt_expires);
2127 rt6_clean_expires(rt);
2129 } else if (valid_lft) {
2130 clock_t expires = 0;
2131 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2132 if (addrconf_finite_timeout(rt_expires)) {
2134 flags |= RTF_EXPIRES;
2135 expires = jiffies_to_clock_t(rt_expires);
2137 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2138 dev, expires, flags);
2143 /* Try to figure out our local address for this prefix */
2145 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2146 struct inet6_ifaddr *ifp;
2147 struct in6_addr addr;
2148 int create = 0, update_lft = 0;
2149 bool tokenized = false;
2151 if (pinfo->prefix_len == 64) {
2152 memcpy(&addr, &pinfo->prefix, 8);
2154 if (!ipv6_addr_any(&in6_dev->token)) {
2155 read_lock_bh(&in6_dev->lock);
2156 memcpy(addr.s6_addr + 8,
2157 in6_dev->token.s6_addr + 8, 8);
2158 read_unlock_bh(&in6_dev->lock);
2160 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2161 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2162 in6_dev_put(in6_dev);
2167 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2169 in6_dev_put(in6_dev);
2174 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
2176 if (ifp == NULL && valid_lft) {
2177 int max_addresses = in6_dev->cnf.max_addresses;
2180 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2181 if (in6_dev->cnf.optimistic_dad &&
2182 !net->ipv6.devconf_all->forwarding && sllao)
2183 addr_flags = IFA_F_OPTIMISTIC;
2186 /* Do not allow to create too much of autoconfigured
2187 * addresses; this would be too easy way to crash kernel.
2189 if (!max_addresses ||
2190 ipv6_count_addresses(in6_dev) < max_addresses)
2191 ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2193 addr_type&IPV6_ADDR_SCOPE_MASK,
2194 addr_flags, valid_lft,
2197 if (IS_ERR_OR_NULL(ifp)) {
2198 in6_dev_put(in6_dev);
2204 ifp->cstamp = jiffies;
2205 ifp->tokenized = tokenized;
2206 addrconf_dad_start(ifp);
2212 #ifdef CONFIG_IPV6_PRIVACY
2213 struct inet6_ifaddr *ift;
2217 /* update lifetime (RFC2462 5.5.3 e) */
2218 spin_lock(&ifp->lock);
2220 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2221 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2224 if (!update_lft && !create && stored_lft) {
2225 if (valid_lft > MIN_VALID_LIFETIME ||
2226 valid_lft > stored_lft)
2228 else if (stored_lft <= MIN_VALID_LIFETIME) {
2229 /* valid_lft <= stored_lft is always true */
2231 * RFC 4862 Section 5.5.3e:
2232 * "Note that the preferred lifetime of
2233 * the corresponding address is always
2234 * reset to the Preferred Lifetime in
2235 * the received Prefix Information
2236 * option, regardless of whether the
2237 * valid lifetime is also reset or
2240 * So if the preferred lifetime in
2241 * this advertisement is different
2242 * than what we have stored, but the
2243 * valid lifetime is invalid, just
2244 * reset prefered_lft.
2246 * We must set the valid lifetime
2247 * to the stored lifetime since we'll
2248 * be updating the timestamp below,
2249 * else we'll set it back to the
2252 if (prefered_lft != ifp->prefered_lft) {
2253 valid_lft = stored_lft;
2257 valid_lft = MIN_VALID_LIFETIME;
2258 if (valid_lft < prefered_lft)
2259 prefered_lft = valid_lft;
2265 ifp->valid_lft = valid_lft;
2266 ifp->prefered_lft = prefered_lft;
2269 ifp->flags &= ~IFA_F_DEPRECATED;
2270 spin_unlock(&ifp->lock);
2272 if (!(flags&IFA_F_TENTATIVE))
2273 ipv6_ifa_notify(0, ifp);
2275 spin_unlock(&ifp->lock);
2277 #ifdef CONFIG_IPV6_PRIVACY
2278 read_lock_bh(&in6_dev->lock);
2279 /* update all temporary addresses in the list */
2280 list_for_each_entry(ift, &in6_dev->tempaddr_list,
2282 int age, max_valid, max_prefered;
2284 if (ifp != ift->ifpub)
2288 * RFC 4941 section 3.3:
2289 * If a received option will extend the lifetime
2290 * of a public address, the lifetimes of
2291 * temporary addresses should be extended,
2292 * subject to the overall constraint that no
2293 * temporary addresses should ever remain
2294 * "valid" or "preferred" for a time longer than
2295 * (TEMP_VALID_LIFETIME) or
2296 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR),
2299 age = (now - ift->cstamp) / HZ;
2300 max_valid = in6_dev->cnf.temp_valid_lft - age;
2304 max_prefered = in6_dev->cnf.temp_prefered_lft -
2305 in6_dev->cnf.max_desync_factor -
2307 if (max_prefered < 0)
2310 if (valid_lft > max_valid)
2311 valid_lft = max_valid;
2313 if (prefered_lft > max_prefered)
2314 prefered_lft = max_prefered;
2316 spin_lock(&ift->lock);
2318 ift->valid_lft = valid_lft;
2319 ift->prefered_lft = prefered_lft;
2321 if (prefered_lft > 0)
2322 ift->flags &= ~IFA_F_DEPRECATED;
2324 spin_unlock(&ift->lock);
2325 if (!(flags&IFA_F_TENTATIVE))
2326 ipv6_ifa_notify(0, ift);
2329 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
2331 * When a new public address is created as
2332 * described in [ADDRCONF], also create a new
2333 * temporary address. Also create a temporary
2334 * address if it's enabled but no temporary
2335 * address currently exists.
2337 read_unlock_bh(&in6_dev->lock);
2338 ipv6_create_tempaddr(ifp, NULL);
2340 read_unlock_bh(&in6_dev->lock);
2347 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2348 in6_dev_put(in6_dev);
2352 * Set destination address.
2353 * Special case for SIT interfaces where we create a new "virtual"
2356 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2358 struct in6_ifreq ireq;
2359 struct net_device *dev;
2365 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2368 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2374 #if IS_ENABLED(CONFIG_IPV6_SIT)
2375 if (dev->type == ARPHRD_SIT) {
2376 const struct net_device_ops *ops = dev->netdev_ops;
2378 struct ip_tunnel_parm p;
2380 err = -EADDRNOTAVAIL;
2381 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2384 memset(&p, 0, sizeof(p));
2385 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2389 p.iph.protocol = IPPROTO_IPV6;
2391 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2393 if (ops->ndo_do_ioctl) {
2394 mm_segment_t oldfs = get_fs();
2397 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2404 dev = __dev_get_by_name(net, p.name);
2407 err = dev_open(dev);
2418 * Manual configuration of address on an interface
2420 static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx,
2421 const struct in6_addr *peer_pfx,
2422 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2425 struct inet6_ifaddr *ifp;
2426 struct inet6_dev *idev;
2427 struct net_device *dev;
2431 unsigned long timeout;
2438 /* check the lifetime */
2439 if (!valid_lft || prefered_lft > valid_lft)
2442 dev = __dev_get_by_index(net, ifindex);
2446 idev = addrconf_add_dev(dev);
2448 return PTR_ERR(idev);
2450 scope = ipv6_addr_scope(pfx);
2452 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2453 if (addrconf_finite_timeout(timeout)) {
2454 expires = jiffies_to_clock_t(timeout * HZ);
2455 valid_lft = timeout;
2456 flags = RTF_EXPIRES;
2460 ifa_flags |= IFA_F_PERMANENT;
2463 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2464 if (addrconf_finite_timeout(timeout)) {
2466 ifa_flags |= IFA_F_DEPRECATED;
2467 prefered_lft = timeout;
2470 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2471 valid_lft, prefered_lft);
2474 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2477 * Note that section 3.1 of RFC 4429 indicates
2478 * that the Optimistic flag should not be set for
2479 * manually configured addresses
2481 addrconf_dad_start(ifp);
2487 return PTR_ERR(ifp);
2490 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
2493 struct inet6_ifaddr *ifp;
2494 struct inet6_dev *idev;
2495 struct net_device *dev;
2500 dev = __dev_get_by_index(net, ifindex);
2504 if ((idev = __in6_dev_get(dev)) == NULL)
2507 read_lock_bh(&idev->lock);
2508 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2509 if (ifp->prefix_len == plen &&
2510 ipv6_addr_equal(pfx, &ifp->addr)) {
2512 read_unlock_bh(&idev->lock);
2518 read_unlock_bh(&idev->lock);
2519 return -EADDRNOTAVAIL;
2523 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2525 struct in6_ifreq ireq;
2528 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2531 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2535 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2536 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2537 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2542 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2544 struct in6_ifreq ireq;
2547 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2550 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2554 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2555 ireq.ifr6_prefixlen);
2560 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2561 int plen, int scope)
2563 struct inet6_ifaddr *ifp;
2565 ifp = ipv6_add_addr(idev, addr, NULL, plen,
2566 scope, IFA_F_PERMANENT, 0, 0);
2568 spin_lock_bh(&ifp->lock);
2569 ifp->flags &= ~IFA_F_TENTATIVE;
2570 spin_unlock_bh(&ifp->lock);
2571 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2576 #if IS_ENABLED(CONFIG_IPV6_SIT)
2577 static void sit_add_v4_addrs(struct inet6_dev *idev)
2579 struct in6_addr addr;
2580 struct net_device *dev;
2581 struct net *net = dev_net(idev->dev);
2586 memset(&addr, 0, sizeof(struct in6_addr));
2587 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2589 if (idev->dev->flags&IFF_POINTOPOINT) {
2590 addr.s6_addr32[0] = htonl(0xfe800000);
2593 scope = IPV6_ADDR_COMPATv4;
2596 if (addr.s6_addr32[3]) {
2597 add_addr(idev, &addr, 128, scope);
2601 for_each_netdev(net, dev) {
2602 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2603 if (in_dev && (dev->flags & IFF_UP)) {
2604 struct in_ifaddr *ifa;
2608 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2611 addr.s6_addr32[3] = ifa->ifa_local;
2613 if (ifa->ifa_scope == RT_SCOPE_LINK)
2615 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2616 if (idev->dev->flags&IFF_POINTOPOINT)
2620 if (idev->dev->flags&IFF_POINTOPOINT)
2625 add_addr(idev, &addr, plen, flag);
2632 static void init_loopback(struct net_device *dev)
2634 struct inet6_dev *idev;
2635 struct net_device *sp_dev;
2636 struct inet6_ifaddr *sp_ifa;
2637 struct rt6_info *sp_rt;
2643 if ((idev = ipv6_find_idev(dev)) == NULL) {
2644 pr_debug("%s: add_dev failed\n", __func__);
2648 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2650 /* Add routes to other interface's IPv6 addresses */
2651 for_each_netdev(dev_net(dev), sp_dev) {
2652 if (!strcmp(sp_dev->name, dev->name))
2655 idev = __in6_dev_get(sp_dev);
2659 read_lock_bh(&idev->lock);
2660 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2662 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2668 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, 0);
2670 /* Failure cases are ignored */
2671 if (!IS_ERR(sp_rt)) {
2676 read_unlock_bh(&idev->lock);
2680 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
2682 struct inet6_ifaddr *ifp;
2683 u32 addr_flags = IFA_F_PERMANENT;
2685 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2686 if (idev->cnf.optimistic_dad &&
2687 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2688 addr_flags |= IFA_F_OPTIMISTIC;
2692 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags, 0, 0);
2694 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2695 addrconf_dad_start(ifp);
2700 static void addrconf_dev_config(struct net_device *dev)
2702 struct in6_addr addr;
2703 struct inet6_dev *idev;
2707 if ((dev->type != ARPHRD_ETHER) &&
2708 (dev->type != ARPHRD_FDDI) &&
2709 (dev->type != ARPHRD_ARCNET) &&
2710 (dev->type != ARPHRD_INFINIBAND) &&
2711 (dev->type != ARPHRD_IEEE802154) &&
2712 (dev->type != ARPHRD_IEEE1394)) {
2713 /* Alas, we support only Ethernet autoconfiguration. */
2717 idev = addrconf_add_dev(dev);
2721 memset(&addr, 0, sizeof(struct in6_addr));
2722 addr.s6_addr32[0] = htonl(0xFE800000);
2724 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2725 addrconf_add_linklocal(idev, &addr);
2728 #if IS_ENABLED(CONFIG_IPV6_SIT)
2729 static void addrconf_sit_config(struct net_device *dev)
2731 struct inet6_dev *idev;
2736 * Configure the tunnel with one of our IPv4
2737 * addresses... we should configure all of
2738 * our v4 addrs in the tunnel
2741 if ((idev = ipv6_find_idev(dev)) == NULL) {
2742 pr_debug("%s: add_dev failed\n", __func__);
2746 if (dev->priv_flags & IFF_ISATAP) {
2747 struct in6_addr addr;
2749 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2750 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2751 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2752 addrconf_add_linklocal(idev, &addr);
2756 sit_add_v4_addrs(idev);
2758 if (dev->flags&IFF_POINTOPOINT)
2759 addrconf_add_mroute(dev);
2765 #if IS_ENABLED(CONFIG_NET_IPGRE)
2766 static void addrconf_gre_config(struct net_device *dev)
2768 struct inet6_dev *idev;
2769 struct in6_addr addr;
2773 if ((idev = ipv6_find_idev(dev)) == NULL) {
2774 pr_debug("%s: add_dev failed\n", __func__);
2778 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2779 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2781 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2782 addrconf_add_linklocal(idev, &addr);
2787 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2789 struct in6_addr lladdr;
2791 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2792 addrconf_add_linklocal(idev, &lladdr);
2798 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2800 struct net_device *link_dev;
2801 struct net *net = dev_net(idev->dev);
2803 /* first try to inherit the link-local address from the link device */
2804 if (idev->dev->iflink &&
2805 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2806 if (!ipv6_inherit_linklocal(idev, link_dev))
2809 /* then try to inherit it from any device */
2810 for_each_netdev(net, link_dev) {
2811 if (!ipv6_inherit_linklocal(idev, link_dev))
2814 pr_debug("init ip6-ip6: add_linklocal failed\n");
2818 * Autoconfigure tunnel with a link-local address so routing protocols,
2819 * DHCPv6, MLD etc. can be run over the virtual link
2822 static void addrconf_ip6_tnl_config(struct net_device *dev)
2824 struct inet6_dev *idev;
2828 idev = addrconf_add_dev(dev);
2830 pr_debug("init ip6-ip6: add_dev failed\n");
2833 ip6_tnl_add_linklocal(idev);
2836 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2839 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2840 struct inet6_dev *idev = __in6_dev_get(dev);
2841 int run_pending = 0;
2845 case NETDEV_REGISTER:
2846 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2847 idev = ipv6_add_dev(dev);
2849 return notifier_from_errno(-ENOMEM);
2855 if (dev->flags & IFF_SLAVE)
2858 if (event == NETDEV_UP) {
2859 if (!addrconf_qdisc_ok(dev)) {
2860 /* device is not ready yet. */
2861 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
2866 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2867 idev = ipv6_add_dev(dev);
2870 idev->if_flags |= IF_READY;
2874 if (!addrconf_qdisc_ok(dev)) {
2875 /* device is still not ready. */
2880 if (idev->if_flags & IF_READY)
2881 /* device is already configured. */
2883 idev->if_flags |= IF_READY;
2886 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
2892 switch (dev->type) {
2893 #if IS_ENABLED(CONFIG_IPV6_SIT)
2895 addrconf_sit_config(dev);
2898 #if IS_ENABLED(CONFIG_NET_IPGRE)
2900 addrconf_gre_config(dev);
2903 case ARPHRD_TUNNEL6:
2904 addrconf_ip6_tnl_config(dev);
2906 case ARPHRD_LOOPBACK:
2911 addrconf_dev_config(dev);
2917 addrconf_dad_run(idev);
2920 * If the MTU changed during the interface down,
2921 * when the interface up, the changed MTU must be
2922 * reflected in the idev as well as routers.
2924 if (idev->cnf.mtu6 != dev->mtu &&
2925 dev->mtu >= IPV6_MIN_MTU) {
2926 rt6_mtu_change(dev, dev->mtu);
2927 idev->cnf.mtu6 = dev->mtu;
2929 idev->tstamp = jiffies;
2930 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2933 * If the changed mtu during down is lower than
2934 * IPV6_MIN_MTU stop IPv6 on this interface.
2936 if (dev->mtu < IPV6_MIN_MTU)
2937 addrconf_ifdown(dev, 1);
2941 case NETDEV_CHANGEMTU:
2942 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2943 rt6_mtu_change(dev, dev->mtu);
2944 idev->cnf.mtu6 = dev->mtu;
2948 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2949 idev = ipv6_add_dev(dev);
2955 * MTU falled under IPV6_MIN_MTU.
2956 * Stop IPv6 on this interface.
2960 case NETDEV_UNREGISTER:
2962 * Remove all addresses from this interface.
2964 addrconf_ifdown(dev, event != NETDEV_DOWN);
2967 case NETDEV_CHANGENAME:
2969 snmp6_unregister_dev(idev);
2970 addrconf_sysctl_unregister(idev);
2971 addrconf_sysctl_register(idev);
2972 err = snmp6_register_dev(idev);
2974 return notifier_from_errno(err);
2978 case NETDEV_PRE_TYPE_CHANGE:
2979 case NETDEV_POST_TYPE_CHANGE:
2980 addrconf_type_change(dev, event);
2988 * addrconf module should be notified of a device going up
2990 static struct notifier_block ipv6_dev_notf = {
2991 .notifier_call = addrconf_notify,
2994 static void addrconf_type_change(struct net_device *dev, unsigned long event)
2996 struct inet6_dev *idev;
2999 idev = __in6_dev_get(dev);
3001 if (event == NETDEV_POST_TYPE_CHANGE)
3002 ipv6_mc_remap(idev);
3003 else if (event == NETDEV_PRE_TYPE_CHANGE)
3004 ipv6_mc_unmap(idev);
3007 static int addrconf_ifdown(struct net_device *dev, int how)
3009 struct net *net = dev_net(dev);
3010 struct inet6_dev *idev;
3011 struct inet6_ifaddr *ifa;
3016 rt6_ifdown(net, dev);
3017 neigh_ifdown(&nd_tbl, dev);
3019 idev = __in6_dev_get(dev);
3024 * Step 1: remove reference to ipv6 device from parent device.
3030 /* protected by rtnl_lock */
3031 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3033 /* Step 1.5: remove snmp6 entry */
3034 snmp6_unregister_dev(idev);
3038 /* Step 2: clear hash table */
3039 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3040 struct hlist_head *h = &inet6_addr_lst[i];
3042 spin_lock_bh(&addrconf_hash_lock);
3044 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3045 if (ifa->idev == idev) {
3046 hlist_del_init_rcu(&ifa->addr_lst);
3047 addrconf_del_dad_timer(ifa);
3051 spin_unlock_bh(&addrconf_hash_lock);
3054 write_lock_bh(&idev->lock);
3056 addrconf_del_rs_timer(idev);
3058 /* Step 2: clear flags for stateless addrconf */
3060 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3062 #ifdef CONFIG_IPV6_PRIVACY
3063 if (how && del_timer(&idev->regen_timer))
3066 /* Step 3: clear tempaddr list */
3067 while (!list_empty(&idev->tempaddr_list)) {
3068 ifa = list_first_entry(&idev->tempaddr_list,
3069 struct inet6_ifaddr, tmp_list);
3070 list_del(&ifa->tmp_list);
3071 write_unlock_bh(&idev->lock);
3072 spin_lock_bh(&ifa->lock);
3075 in6_ifa_put(ifa->ifpub);
3078 spin_unlock_bh(&ifa->lock);
3080 write_lock_bh(&idev->lock);
3084 while (!list_empty(&idev->addr_list)) {
3085 ifa = list_first_entry(&idev->addr_list,
3086 struct inet6_ifaddr, if_list);
3087 addrconf_del_dad_timer(ifa);
3089 list_del(&ifa->if_list);
3091 write_unlock_bh(&idev->lock);
3093 spin_lock_bh(&ifa->state_lock);
3095 ifa->state = INET6_IFADDR_STATE_DEAD;
3096 spin_unlock_bh(&ifa->state_lock);
3098 if (state != INET6_IFADDR_STATE_DEAD) {
3099 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3100 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3104 write_lock_bh(&idev->lock);
3107 write_unlock_bh(&idev->lock);
3109 /* Step 5: Discard multicast list */
3111 ipv6_mc_destroy_dev(idev);
3115 idev->tstamp = jiffies;
3117 /* Last: Shot the device (if unregistered) */
3119 addrconf_sysctl_unregister(idev);
3120 neigh_parms_release(&nd_tbl, idev->nd_parms);
3121 neigh_ifdown(&nd_tbl, dev);
3127 static void addrconf_rs_timer(unsigned long data)
3129 struct inet6_dev *idev = (struct inet6_dev *)data;
3130 struct in6_addr lladdr;
3132 write_lock(&idev->lock);
3133 if (idev->dead || !(idev->if_flags & IF_READY))
3136 if (!ipv6_accept_ra(idev))
3139 /* Announcement received after solicitation was sent */
3140 if (idev->if_flags & IF_RA_RCVD)
3143 if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
3144 if (!__ipv6_get_lladdr(idev, &lladdr, IFA_F_TENTATIVE))
3145 ndisc_send_rs(idev->dev, &lladdr,
3146 &in6addr_linklocal_allrouters);
3150 /* The wait after the last probe can be shorter */
3151 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3152 idev->cnf.rtr_solicits) ?
3153 idev->cnf.rtr_solicit_delay :
3154 idev->cnf.rtr_solicit_interval);
3157 * Note: we do not support deprecated "all on-link"
3158 * assumption any longer.
3160 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3164 write_unlock(&idev->lock);
3169 * Duplicate Address Detection
3171 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3173 unsigned long rand_num;
3174 struct inet6_dev *idev = ifp->idev;
3176 if (ifp->flags & IFA_F_OPTIMISTIC)
3179 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
3181 ifp->dad_probes = idev->cnf.dad_transmits;
3182 addrconf_mod_dad_timer(ifp, rand_num);
3185 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3187 struct inet6_dev *idev = ifp->idev;
3188 struct net_device *dev = idev->dev;
3190 addrconf_join_solict(dev, &ifp->addr);
3192 net_srandom(ifp->addr.s6_addr32[3]);
3194 read_lock_bh(&idev->lock);
3195 spin_lock(&ifp->lock);
3196 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3199 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3200 idev->cnf.accept_dad < 1 ||
3201 !(ifp->flags&IFA_F_TENTATIVE) ||
3202 ifp->flags & IFA_F_NODAD) {
3203 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3204 spin_unlock(&ifp->lock);
3205 read_unlock_bh(&idev->lock);
3207 addrconf_dad_completed(ifp);
3211 if (!(idev->if_flags & IF_READY)) {
3212 spin_unlock(&ifp->lock);
3213 read_unlock_bh(&idev->lock);
3215 * If the device is not ready:
3216 * - keep it tentative if it is a permanent address.
3217 * - otherwise, kill it.
3220 addrconf_dad_stop(ifp, 0);
3225 * Optimistic nodes can start receiving
3228 if (ifp->flags & IFA_F_OPTIMISTIC)
3229 ip6_ins_rt(ifp->rt);
3231 addrconf_dad_kick(ifp);
3233 spin_unlock(&ifp->lock);
3234 read_unlock_bh(&idev->lock);
3237 static void addrconf_dad_timer(unsigned long data)
3239 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
3240 struct inet6_dev *idev = ifp->idev;
3241 struct in6_addr mcaddr;
3243 if (!ifp->dad_probes && addrconf_dad_end(ifp))
3246 write_lock(&idev->lock);
3247 if (idev->dead || !(idev->if_flags & IF_READY)) {
3248 write_unlock(&idev->lock);
3252 spin_lock(&ifp->lock);
3253 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3254 spin_unlock(&ifp->lock);
3255 write_unlock(&idev->lock);
3259 if (ifp->dad_probes == 0) {
3261 * DAD was successful
3264 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3265 spin_unlock(&ifp->lock);
3266 write_unlock(&idev->lock);
3268 addrconf_dad_completed(ifp);
3274 addrconf_mod_dad_timer(ifp, ifp->idev->nd_parms->retrans_time);
3275 spin_unlock(&ifp->lock);
3276 write_unlock(&idev->lock);
3278 /* send a neighbour solicitation for our addr */
3279 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3280 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
3285 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3287 struct net_device *dev = ifp->idev->dev;
3288 struct in6_addr lladdr;
3289 bool send_rs, send_mld;
3291 addrconf_del_dad_timer(ifp);
3294 * Configure the address for reception. Now it is valid.
3297 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3299 /* If added prefix is link local and we are prepared to process
3300 router advertisements, start sending router solicitations.
3303 read_lock_bh(&ifp->idev->lock);
3304 spin_lock(&ifp->lock);
3305 send_mld = ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL &&
3306 ifp->idev->valid_ll_addr_cnt == 1;
3307 send_rs = send_mld &&
3308 ipv6_accept_ra(ifp->idev) &&
3309 ifp->idev->cnf.rtr_solicits > 0 &&
3310 (dev->flags&IFF_LOOPBACK) == 0;
3311 spin_unlock(&ifp->lock);
3312 read_unlock_bh(&ifp->idev->lock);
3314 /* While dad is in progress mld report's source address is in6_addrany.
3315 * Resend with proper ll now.
3318 ipv6_mc_dad_complete(ifp->idev);
3322 * If a host as already performed a random delay
3323 * [...] as part of DAD [...] there is no need
3324 * to delay again before sending the first RS
3326 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3328 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
3330 write_lock_bh(&ifp->idev->lock);
3331 spin_lock(&ifp->lock);
3332 ifp->idev->rs_probes = 1;
3333 ifp->idev->if_flags |= IF_RS_SENT;
3334 addrconf_mod_rs_timer(ifp->idev,
3335 ifp->idev->cnf.rtr_solicit_interval);
3336 spin_unlock(&ifp->lock);
3337 write_unlock_bh(&ifp->idev->lock);
3341 static void addrconf_dad_run(struct inet6_dev *idev)
3343 struct inet6_ifaddr *ifp;
3345 read_lock_bh(&idev->lock);
3346 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3347 spin_lock(&ifp->lock);
3348 if (ifp->flags & IFA_F_TENTATIVE &&
3349 ifp->state == INET6_IFADDR_STATE_DAD)
3350 addrconf_dad_kick(ifp);
3351 spin_unlock(&ifp->lock);
3353 read_unlock_bh(&idev->lock);
3356 #ifdef CONFIG_PROC_FS
3357 struct if6_iter_state {
3358 struct seq_net_private p;
3363 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3365 struct inet6_ifaddr *ifa = NULL;
3366 struct if6_iter_state *state = seq->private;
3367 struct net *net = seq_file_net(seq);
3370 /* initial bucket if pos is 0 */
3376 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3377 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
3379 if (!net_eq(dev_net(ifa->idev->dev), net))
3381 /* sync with offset */
3382 if (p < state->offset) {
3390 /* prepare for next bucket */
3397 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3398 struct inet6_ifaddr *ifa)
3400 struct if6_iter_state *state = seq->private;
3401 struct net *net = seq_file_net(seq);
3403 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
3404 if (!net_eq(dev_net(ifa->idev->dev), net))
3410 while (++state->bucket < IN6_ADDR_HSIZE) {
3412 hlist_for_each_entry_rcu_bh(ifa,
3413 &inet6_addr_lst[state->bucket], addr_lst) {
3414 if (!net_eq(dev_net(ifa->idev->dev), net))
3424 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3428 return if6_get_first(seq, *pos);
3431 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3433 struct inet6_ifaddr *ifa;
3435 ifa = if6_get_next(seq, v);
3440 static void if6_seq_stop(struct seq_file *seq, void *v)
3443 rcu_read_unlock_bh();
3446 static int if6_seq_show(struct seq_file *seq, void *v)
3448 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3449 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3451 ifp->idev->dev->ifindex,
3455 ifp->idev->dev->name);
3459 static const struct seq_operations if6_seq_ops = {
3460 .start = if6_seq_start,
3461 .next = if6_seq_next,
3462 .show = if6_seq_show,
3463 .stop = if6_seq_stop,
3466 static int if6_seq_open(struct inode *inode, struct file *file)
3468 return seq_open_net(inode, file, &if6_seq_ops,
3469 sizeof(struct if6_iter_state));
3472 static const struct file_operations if6_fops = {
3473 .owner = THIS_MODULE,
3474 .open = if6_seq_open,
3476 .llseek = seq_lseek,
3477 .release = seq_release_net,
3480 static int __net_init if6_proc_net_init(struct net *net)
3482 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
3487 static void __net_exit if6_proc_net_exit(struct net *net)
3489 remove_proc_entry("if_inet6", net->proc_net);
3492 static struct pernet_operations if6_proc_net_ops = {
3493 .init = if6_proc_net_init,
3494 .exit = if6_proc_net_exit,
3497 int __init if6_proc_init(void)
3499 return register_pernet_subsys(&if6_proc_net_ops);
3502 void if6_proc_exit(void)
3504 unregister_pernet_subsys(&if6_proc_net_ops);
3506 #endif /* CONFIG_PROC_FS */
3508 #if IS_ENABLED(CONFIG_IPV6_MIP6)
3509 /* Check if address is a home address configured on any interface. */
3510 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3513 struct inet6_ifaddr *ifp = NULL;
3514 unsigned int hash = inet6_addr_hash(addr);
3517 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
3518 if (!net_eq(dev_net(ifp->idev->dev), net))
3520 if (ipv6_addr_equal(&ifp->addr, addr) &&
3521 (ifp->flags & IFA_F_HOMEADDRESS)) {
3526 rcu_read_unlock_bh();
3532 * Periodic address status verification
3535 static void addrconf_verify(unsigned long foo)
3537 unsigned long now, next, next_sec, next_sched;
3538 struct inet6_ifaddr *ifp;
3542 spin_lock(&addrconf_verify_lock);
3544 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3546 del_timer(&addr_chk_timer);
3548 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3550 hlist_for_each_entry_rcu_bh(ifp,
3551 &inet6_addr_lst[i], addr_lst) {
3554 if (ifp->flags & IFA_F_PERMANENT)
3557 spin_lock(&ifp->lock);
3558 /* We try to batch several events at once. */
3559 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3561 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3562 age >= ifp->valid_lft) {
3563 spin_unlock(&ifp->lock);
3567 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3568 spin_unlock(&ifp->lock);
3570 } else if (age >= ifp->prefered_lft) {
3571 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3574 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3576 ifp->flags |= IFA_F_DEPRECATED;
3579 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3580 next = ifp->tstamp + ifp->valid_lft * HZ;
3582 spin_unlock(&ifp->lock);
3587 ipv6_ifa_notify(0, ifp);
3591 #ifdef CONFIG_IPV6_PRIVACY
3592 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3593 !(ifp->flags&IFA_F_TENTATIVE)) {
3594 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3595 ifp->idev->cnf.dad_transmits *
3596 ifp->idev->nd_parms->retrans_time / HZ;
3598 if (age >= ifp->prefered_lft - regen_advance) {
3599 struct inet6_ifaddr *ifpub = ifp->ifpub;
3600 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3601 next = ifp->tstamp + ifp->prefered_lft * HZ;
3602 if (!ifp->regen_count && ifpub) {
3605 in6_ifa_hold(ifpub);
3606 spin_unlock(&ifp->lock);
3608 spin_lock(&ifpub->lock);
3609 ifpub->regen_count = 0;
3610 spin_unlock(&ifpub->lock);
3611 ipv6_create_tempaddr(ifpub, ifp);
3616 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3617 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3618 spin_unlock(&ifp->lock);
3621 /* ifp->prefered_lft <= ifp->valid_lft */
3622 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3623 next = ifp->tstamp + ifp->prefered_lft * HZ;
3624 spin_unlock(&ifp->lock);
3629 next_sec = round_jiffies_up(next);
3632 /* If rounded timeout is accurate enough, accept it. */
3633 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3634 next_sched = next_sec;
3636 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3637 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3638 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3640 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3641 now, next, next_sec, next_sched));
3643 addr_chk_timer.expires = next_sched;
3644 add_timer(&addr_chk_timer);
3645 spin_unlock(&addrconf_verify_lock);
3646 rcu_read_unlock_bh();
3649 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
3650 struct in6_addr **peer_pfx)
3652 struct in6_addr *pfx = NULL;
3657 pfx = nla_data(addr);
3660 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3662 pfx = nla_data(local);
3668 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3669 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3670 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3671 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3675 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
3677 struct net *net = sock_net(skb->sk);
3678 struct ifaddrmsg *ifm;
3679 struct nlattr *tb[IFA_MAX+1];
3680 struct in6_addr *pfx, *peer_pfx;
3683 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3687 ifm = nlmsg_data(nlh);
3688 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
3692 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3695 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3696 u32 prefered_lft, u32 valid_lft)
3700 unsigned long timeout;
3702 if (!valid_lft || (prefered_lft > valid_lft))
3705 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3706 if (addrconf_finite_timeout(timeout)) {
3707 expires = jiffies_to_clock_t(timeout * HZ);
3708 valid_lft = timeout;
3709 flags = RTF_EXPIRES;
3713 ifa_flags |= IFA_F_PERMANENT;
3716 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3717 if (addrconf_finite_timeout(timeout)) {
3719 ifa_flags |= IFA_F_DEPRECATED;
3720 prefered_lft = timeout;
3723 spin_lock_bh(&ifp->lock);
3724 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3725 ifp->tstamp = jiffies;
3726 ifp->valid_lft = valid_lft;
3727 ifp->prefered_lft = prefered_lft;
3729 spin_unlock_bh(&ifp->lock);
3730 if (!(ifp->flags&IFA_F_TENTATIVE))
3731 ipv6_ifa_notify(0, ifp);
3733 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3741 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
3743 struct net *net = sock_net(skb->sk);
3744 struct ifaddrmsg *ifm;
3745 struct nlattr *tb[IFA_MAX+1];
3746 struct in6_addr *pfx, *peer_pfx;
3747 struct inet6_ifaddr *ifa;
3748 struct net_device *dev;
3749 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3753 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3757 ifm = nlmsg_data(nlh);
3758 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
3762 if (tb[IFA_CACHEINFO]) {
3763 struct ifa_cacheinfo *ci;
3765 ci = nla_data(tb[IFA_CACHEINFO]);
3766 valid_lft = ci->ifa_valid;
3767 preferred_lft = ci->ifa_prefered;
3769 preferred_lft = INFINITY_LIFE_TIME;
3770 valid_lft = INFINITY_LIFE_TIME;
3773 dev = __dev_get_by_index(net, ifm->ifa_index);
3777 /* We ignore other flags so far. */
3778 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3780 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3783 * It would be best to check for !NLM_F_CREATE here but
3784 * userspace alreay relies on not having to provide this.
3786 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
3787 ifm->ifa_prefixlen, ifa_flags,
3788 preferred_lft, valid_lft);
3791 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3792 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3795 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3802 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3803 u8 scope, int ifindex)
3805 struct ifaddrmsg *ifm;
3807 ifm = nlmsg_data(nlh);
3808 ifm->ifa_family = AF_INET6;
3809 ifm->ifa_prefixlen = prefixlen;
3810 ifm->ifa_flags = flags;
3811 ifm->ifa_scope = scope;
3812 ifm->ifa_index = ifindex;
3815 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3816 unsigned long tstamp, u32 preferred, u32 valid)
3818 struct ifa_cacheinfo ci;
3820 ci.cstamp = cstamp_delta(cstamp);
3821 ci.tstamp = cstamp_delta(tstamp);
3822 ci.ifa_prefered = preferred;
3823 ci.ifa_valid = valid;
3825 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3828 static inline int rt_scope(int ifa_scope)
3830 if (ifa_scope & IFA_HOST)
3831 return RT_SCOPE_HOST;
3832 else if (ifa_scope & IFA_LINK)
3833 return RT_SCOPE_LINK;
3834 else if (ifa_scope & IFA_SITE)
3835 return RT_SCOPE_SITE;
3837 return RT_SCOPE_UNIVERSE;
3840 static inline int inet6_ifaddr_msgsize(void)
3842 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3843 + nla_total_size(16) /* IFA_LOCAL */
3844 + nla_total_size(16) /* IFA_ADDRESS */
3845 + nla_total_size(sizeof(struct ifa_cacheinfo));
3848 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3849 u32 portid, u32 seq, int event, unsigned int flags)
3851 struct nlmsghdr *nlh;
3852 u32 preferred, valid;
3854 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3858 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3859 ifa->idev->dev->ifindex);
3861 if (!(ifa->flags&IFA_F_PERMANENT)) {
3862 preferred = ifa->prefered_lft;
3863 valid = ifa->valid_lft;
3864 if (preferred != INFINITY_LIFE_TIME) {
3865 long tval = (jiffies - ifa->tstamp)/HZ;
3866 if (preferred > tval)
3870 if (valid != INFINITY_LIFE_TIME) {
3878 preferred = INFINITY_LIFE_TIME;
3879 valid = INFINITY_LIFE_TIME;
3882 if (!ipv6_addr_any(&ifa->peer_addr)) {
3883 if (nla_put(skb, IFA_LOCAL, 16, &ifa->addr) < 0 ||
3884 nla_put(skb, IFA_ADDRESS, 16, &ifa->peer_addr) < 0)
3887 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0)
3890 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
3893 return nlmsg_end(skb, nlh);
3896 nlmsg_cancel(skb, nlh);
3900 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3901 u32 portid, u32 seq, int event, u16 flags)
3903 struct nlmsghdr *nlh;
3904 u8 scope = RT_SCOPE_UNIVERSE;
3905 int ifindex = ifmca->idev->dev->ifindex;
3907 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3908 scope = RT_SCOPE_SITE;
3910 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3914 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3915 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3916 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3917 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3918 nlmsg_cancel(skb, nlh);
3922 return nlmsg_end(skb, nlh);
3925 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3926 u32 portid, u32 seq, int event, unsigned int flags)
3928 struct nlmsghdr *nlh;
3929 u8 scope = RT_SCOPE_UNIVERSE;
3930 int ifindex = ifaca->aca_idev->dev->ifindex;
3932 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3933 scope = RT_SCOPE_SITE;
3935 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3939 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3940 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3941 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3942 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3943 nlmsg_cancel(skb, nlh);
3947 return nlmsg_end(skb, nlh);
3956 /* called with rcu_read_lock() */
3957 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3958 struct netlink_callback *cb, enum addr_type_t type,
3959 int s_ip_idx, int *p_ip_idx)
3961 struct ifmcaddr6 *ifmca;
3962 struct ifacaddr6 *ifaca;
3964 int ip_idx = *p_ip_idx;
3966 read_lock_bh(&idev->lock);
3968 case UNICAST_ADDR: {
3969 struct inet6_ifaddr *ifa;
3971 /* unicast address incl. temp addr */
3972 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3973 if (++ip_idx < s_ip_idx)
3975 err = inet6_fill_ifaddr(skb, ifa,
3976 NETLINK_CB(cb->skb).portid,
3982 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3986 case MULTICAST_ADDR:
3987 /* multicast address */
3988 for (ifmca = idev->mc_list; ifmca;
3989 ifmca = ifmca->next, ip_idx++) {
3990 if (ip_idx < s_ip_idx)
3992 err = inet6_fill_ifmcaddr(skb, ifmca,
3993 NETLINK_CB(cb->skb).portid,
4002 /* anycast address */
4003 for (ifaca = idev->ac_list; ifaca;
4004 ifaca = ifaca->aca_next, ip_idx++) {
4005 if (ip_idx < s_ip_idx)
4007 err = inet6_fill_ifacaddr(skb, ifaca,
4008 NETLINK_CB(cb->skb).portid,
4019 read_unlock_bh(&idev->lock);
4024 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4025 enum addr_type_t type)
4027 struct net *net = sock_net(skb->sk);
4030 int s_idx, s_ip_idx;
4031 struct net_device *dev;
4032 struct inet6_dev *idev;
4033 struct hlist_head *head;
4036 s_idx = idx = cb->args[1];
4037 s_ip_idx = ip_idx = cb->args[2];
4040 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4041 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4043 head = &net->dev_index_head[h];
4044 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4047 if (h > s_h || idx > s_idx)
4050 idev = __in6_dev_get(dev);
4054 if (in6_dump_addrs(idev, skb, cb, type,
4055 s_ip_idx, &ip_idx) <= 0)
4065 cb->args[2] = ip_idx;
4070 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4072 enum addr_type_t type = UNICAST_ADDR;
4074 return inet6_dump_addr(skb, cb, type);
4077 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4079 enum addr_type_t type = MULTICAST_ADDR;
4081 return inet6_dump_addr(skb, cb, type);
4085 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4087 enum addr_type_t type = ANYCAST_ADDR;
4089 return inet6_dump_addr(skb, cb, type);
4092 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
4094 struct net *net = sock_net(in_skb->sk);
4095 struct ifaddrmsg *ifm;
4096 struct nlattr *tb[IFA_MAX+1];
4097 struct in6_addr *addr = NULL, *peer;
4098 struct net_device *dev = NULL;
4099 struct inet6_ifaddr *ifa;
4100 struct sk_buff *skb;
4103 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4107 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4113 ifm = nlmsg_data(nlh);
4115 dev = __dev_get_by_index(net, ifm->ifa_index);
4117 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4119 err = -EADDRNOTAVAIL;
4123 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4129 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4130 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4132 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4133 WARN_ON(err == -EMSGSIZE);
4137 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4144 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4146 struct sk_buff *skb;
4147 struct net *net = dev_net(ifa->idev->dev);
4150 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4154 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4156 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4157 WARN_ON(err == -EMSGSIZE);
4161 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4165 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4168 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4169 __s32 *array, int bytes)
4171 BUG_ON(bytes < (DEVCONF_MAX * 4));
4173 memset(array, 0, bytes);
4174 array[DEVCONF_FORWARDING] = cnf->forwarding;
4175 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4176 array[DEVCONF_MTU6] = cnf->mtu6;
4177 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4178 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4179 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4180 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4181 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4182 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4183 jiffies_to_msecs(cnf->rtr_solicit_interval);
4184 array[DEVCONF_RTR_SOLICIT_DELAY] =
4185 jiffies_to_msecs(cnf->rtr_solicit_delay);
4186 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4187 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4188 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4189 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4190 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
4191 #ifdef CONFIG_IPV6_PRIVACY
4192 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4193 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4194 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4195 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4196 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4198 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4199 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4200 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4201 #ifdef CONFIG_IPV6_ROUTER_PREF
4202 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4203 array[DEVCONF_RTR_PROBE_INTERVAL] =
4204 jiffies_to_msecs(cnf->rtr_probe_interval);
4205 #ifdef CONFIG_IPV6_ROUTE_INFO
4206 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4209 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4210 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4211 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4212 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4214 #ifdef CONFIG_IPV6_MROUTE
4215 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4217 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4218 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4219 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4220 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4223 static inline size_t inet6_ifla6_size(void)
4225 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4226 + nla_total_size(sizeof(struct ifla_cacheinfo))
4227 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4228 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4229 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4230 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
4233 static inline size_t inet6_if_nlmsg_size(void)
4235 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4236 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4237 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4238 + nla_total_size(4) /* IFLA_MTU */
4239 + nla_total_size(4) /* IFLA_LINK */
4240 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4243 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4244 int items, int bytes)
4247 int pad = bytes - sizeof(u64) * items;
4250 /* Use put_unaligned() because stats may not be aligned for u64. */
4251 put_unaligned(items, &stats[0]);
4252 for (i = 1; i < items; i++)
4253 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4255 memset(&stats[items], 0, pad);
4258 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
4259 int items, int bytes, size_t syncpoff)
4262 int pad = bytes - sizeof(u64) * items;
4265 /* Use put_unaligned() because stats may not be aligned for u64. */
4266 put_unaligned(items, &stats[0]);
4267 for (i = 1; i < items; i++)
4268 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4270 memset(&stats[items], 0, pad);
4273 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4277 case IFLA_INET6_STATS:
4278 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
4279 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
4281 case IFLA_INET6_ICMP6STATS:
4282 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
4287 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4290 struct ifla_cacheinfo ci;
4292 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4293 goto nla_put_failure;
4294 ci.max_reasm_len = IPV6_MAXPLEN;
4295 ci.tstamp = cstamp_delta(idev->tstamp);
4296 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4297 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
4298 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4299 goto nla_put_failure;
4300 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4302 goto nla_put_failure;
4303 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4305 /* XXX - MC not implemented */
4307 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4309 goto nla_put_failure;
4310 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4312 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4314 goto nla_put_failure;
4315 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4317 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4319 goto nla_put_failure;
4320 read_lock_bh(&idev->lock);
4321 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4322 read_unlock_bh(&idev->lock);
4330 static size_t inet6_get_link_af_size(const struct net_device *dev)
4332 if (!__in6_dev_get(dev))
4335 return inet6_ifla6_size();
4338 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4340 struct inet6_dev *idev = __in6_dev_get(dev);
4345 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4351 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4353 struct inet6_ifaddr *ifp;
4354 struct net_device *dev = idev->dev;
4355 bool update_rs = false;
4356 struct in6_addr ll_addr;
4360 if (ipv6_addr_any(token))
4362 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4364 if (!ipv6_accept_ra(idev))
4366 if (idev->cnf.rtr_solicits <= 0)
4369 write_lock_bh(&idev->lock);
4371 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4372 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4374 write_unlock_bh(&idev->lock);
4376 if (!idev->dead && (idev->if_flags & IF_READY) &&
4377 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4378 IFA_F_OPTIMISTIC)) {
4380 /* If we're not ready, then normal ifup will take care
4381 * of this. Otherwise, we need to request our rs here.
4383 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4387 write_lock_bh(&idev->lock);
4390 idev->if_flags |= IF_RS_SENT;
4391 idev->rs_probes = 1;
4392 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
4395 /* Well, that's kinda nasty ... */
4396 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4397 spin_lock(&ifp->lock);
4398 if (ifp->tokenized) {
4400 ifp->prefered_lft = 0;
4402 spin_unlock(&ifp->lock);
4405 write_unlock_bh(&idev->lock);
4410 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4413 struct inet6_dev *idev = __in6_dev_get(dev);
4414 struct nlattr *tb[IFLA_INET6_MAX + 1];
4417 return -EAFNOSUPPORT;
4419 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4422 if (tb[IFLA_INET6_TOKEN])
4423 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
4428 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4429 u32 portid, u32 seq, int event, unsigned int flags)
4431 struct net_device *dev = idev->dev;
4432 struct ifinfomsg *hdr;
4433 struct nlmsghdr *nlh;
4436 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
4440 hdr = nlmsg_data(nlh);
4441 hdr->ifi_family = AF_INET6;
4443 hdr->ifi_type = dev->type;
4444 hdr->ifi_index = dev->ifindex;
4445 hdr->ifi_flags = dev_get_flags(dev);
4446 hdr->ifi_change = 0;
4448 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4450 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4451 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4452 (dev->ifindex != dev->iflink &&
4453 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4454 goto nla_put_failure;
4455 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4456 if (protoinfo == NULL)
4457 goto nla_put_failure;
4459 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4460 goto nla_put_failure;
4462 nla_nest_end(skb, protoinfo);
4463 return nlmsg_end(skb, nlh);
4466 nlmsg_cancel(skb, nlh);
4470 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4472 struct net *net = sock_net(skb->sk);
4475 struct net_device *dev;
4476 struct inet6_dev *idev;
4477 struct hlist_head *head;
4480 s_idx = cb->args[1];
4483 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4485 head = &net->dev_index_head[h];
4486 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4489 idev = __in6_dev_get(dev);
4492 if (inet6_fill_ifinfo(skb, idev,
4493 NETLINK_CB(cb->skb).portid,
4495 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4509 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4511 struct sk_buff *skb;
4512 struct net *net = dev_net(idev->dev);
4515 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4519 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4521 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4522 WARN_ON(err == -EMSGSIZE);
4526 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4530 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4533 static inline size_t inet6_prefix_nlmsg_size(void)
4535 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4536 + nla_total_size(sizeof(struct in6_addr))
4537 + nla_total_size(sizeof(struct prefix_cacheinfo));
4540 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4541 struct prefix_info *pinfo, u32 portid, u32 seq,
4542 int event, unsigned int flags)
4544 struct prefixmsg *pmsg;
4545 struct nlmsghdr *nlh;
4546 struct prefix_cacheinfo ci;
4548 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
4552 pmsg = nlmsg_data(nlh);
4553 pmsg->prefix_family = AF_INET6;
4554 pmsg->prefix_pad1 = 0;
4555 pmsg->prefix_pad2 = 0;
4556 pmsg->prefix_ifindex = idev->dev->ifindex;
4557 pmsg->prefix_len = pinfo->prefix_len;
4558 pmsg->prefix_type = pinfo->type;
4559 pmsg->prefix_pad3 = 0;
4560 pmsg->prefix_flags = 0;
4562 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4563 if (pinfo->autoconf)
4564 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4566 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4567 goto nla_put_failure;
4568 ci.preferred_time = ntohl(pinfo->prefered);
4569 ci.valid_time = ntohl(pinfo->valid);
4570 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4571 goto nla_put_failure;
4572 return nlmsg_end(skb, nlh);
4575 nlmsg_cancel(skb, nlh);
4579 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4580 struct prefix_info *pinfo)
4582 struct sk_buff *skb;
4583 struct net *net = dev_net(idev->dev);
4586 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4590 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4592 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4593 WARN_ON(err == -EMSGSIZE);
4597 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4601 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4604 static void update_valid_ll_addr_cnt(struct inet6_ifaddr *ifp, int count)
4606 write_lock_bh(&ifp->idev->lock);
4607 spin_lock(&ifp->lock);
4608 if (((ifp->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|
4609 IFA_F_DADFAILED)) == IFA_F_PERMANENT) &&
4610 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL))
4611 ifp->idev->valid_ll_addr_cnt += count;
4612 WARN_ON(ifp->idev->valid_ll_addr_cnt < 0);
4613 spin_unlock(&ifp->lock);
4614 write_unlock_bh(&ifp->idev->lock);
4617 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4619 struct net *net = dev_net(ifp->idev->dev);
4621 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4625 update_valid_ll_addr_cnt(ifp, 1);
4628 * If the address was optimistic
4629 * we inserted the route at the start of
4630 * our DAD process, so we don't need
4633 if (!(ifp->rt->rt6i_node))
4634 ip6_ins_rt(ifp->rt);
4635 if (ifp->idev->cnf.forwarding)
4636 addrconf_join_anycast(ifp);
4637 if (!ipv6_addr_any(&ifp->peer_addr))
4638 addrconf_prefix_route(&ifp->peer_addr, 128,
4639 ifp->idev->dev, 0, 0);
4642 update_valid_ll_addr_cnt(ifp, -1);
4644 if (ifp->idev->cnf.forwarding)
4645 addrconf_leave_anycast(ifp);
4646 addrconf_leave_solict(ifp->idev, &ifp->addr);
4647 if (!ipv6_addr_any(&ifp->peer_addr)) {
4648 struct rt6_info *rt;
4649 struct net_device *dev = ifp->idev->dev;
4651 rt = rt6_lookup(dev_net(dev), &ifp->peer_addr, NULL,
4659 dst_hold(&ifp->rt->dst);
4661 if (ip6_del_rt(ifp->rt))
4662 dst_free(&ifp->rt->dst);
4665 atomic_inc(&net->ipv6.dev_addr_genid);
4666 rt_genid_bump_ipv6(net);
4669 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4672 if (likely(ifp->idev->dead == 0))
4673 __ipv6_ifa_notify(event, ifp);
4674 rcu_read_unlock_bh();
4677 #ifdef CONFIG_SYSCTL
4680 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
4681 void __user *buffer, size_t *lenp, loff_t *ppos)
4683 int *valp = ctl->data;
4686 struct ctl_table lctl;
4690 * ctl->data points to idev->cnf.forwarding, we should
4691 * not modify it until we get the rtnl lock.
4696 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4699 ret = addrconf_fixup_forwarding(ctl, valp, val);
4705 static void dev_disable_change(struct inet6_dev *idev)
4707 struct netdev_notifier_info info;
4709 if (!idev || !idev->dev)
4712 netdev_notifier_info_init(&info, idev->dev);
4713 if (idev->cnf.disable_ipv6)
4714 addrconf_notify(NULL, NETDEV_DOWN, &info);
4716 addrconf_notify(NULL, NETDEV_UP, &info);
4719 static void addrconf_disable_change(struct net *net, __s32 newf)
4721 struct net_device *dev;
4722 struct inet6_dev *idev;
4725 for_each_netdev_rcu(net, dev) {
4726 idev = __in6_dev_get(dev);
4728 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4729 idev->cnf.disable_ipv6 = newf;
4731 dev_disable_change(idev);
4737 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
4742 if (!rtnl_trylock())
4743 return restart_syscall();
4745 net = (struct net *)table->extra2;
4749 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4754 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4755 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4756 addrconf_disable_change(net, newf);
4757 } else if ((!newf) ^ (!old))
4758 dev_disable_change((struct inet6_dev *)table->extra1);
4765 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
4766 void __user *buffer, size_t *lenp, loff_t *ppos)
4768 int *valp = ctl->data;
4771 struct ctl_table lctl;
4775 * ctl->data points to idev->cnf.disable_ipv6, we should
4776 * not modify it until we get the rtnl lock.
4781 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4784 ret = addrconf_disable_ipv6(ctl, valp, val);
4790 static struct addrconf_sysctl_table
4792 struct ctl_table_header *sysctl_header;
4793 struct ctl_table addrconf_vars[DEVCONF_MAX+1];
4794 } addrconf_sysctl __read_mostly = {
4795 .sysctl_header = NULL,
4798 .procname = "forwarding",
4799 .data = &ipv6_devconf.forwarding,
4800 .maxlen = sizeof(int),
4802 .proc_handler = addrconf_sysctl_forward,
4805 .procname = "hop_limit",
4806 .data = &ipv6_devconf.hop_limit,
4807 .maxlen = sizeof(int),
4809 .proc_handler = proc_dointvec,
4813 .data = &ipv6_devconf.mtu6,
4814 .maxlen = sizeof(int),
4816 .proc_handler = proc_dointvec,
4819 .procname = "accept_ra",
4820 .data = &ipv6_devconf.accept_ra,
4821 .maxlen = sizeof(int),
4823 .proc_handler = proc_dointvec,
4826 .procname = "accept_redirects",
4827 .data = &ipv6_devconf.accept_redirects,
4828 .maxlen = sizeof(int),
4830 .proc_handler = proc_dointvec,
4833 .procname = "autoconf",
4834 .data = &ipv6_devconf.autoconf,
4835 .maxlen = sizeof(int),
4837 .proc_handler = proc_dointvec,
4840 .procname = "dad_transmits",
4841 .data = &ipv6_devconf.dad_transmits,
4842 .maxlen = sizeof(int),
4844 .proc_handler = proc_dointvec,
4847 .procname = "router_solicitations",
4848 .data = &ipv6_devconf.rtr_solicits,
4849 .maxlen = sizeof(int),
4851 .proc_handler = proc_dointvec,
4854 .procname = "router_solicitation_interval",
4855 .data = &ipv6_devconf.rtr_solicit_interval,
4856 .maxlen = sizeof(int),
4858 .proc_handler = proc_dointvec_jiffies,
4861 .procname = "router_solicitation_delay",
4862 .data = &ipv6_devconf.rtr_solicit_delay,
4863 .maxlen = sizeof(int),
4865 .proc_handler = proc_dointvec_jiffies,
4868 .procname = "force_mld_version",
4869 .data = &ipv6_devconf.force_mld_version,
4870 .maxlen = sizeof(int),
4872 .proc_handler = proc_dointvec,
4875 .procname = "mldv1_unsolicited_report_interval",
4877 &ipv6_devconf.mldv1_unsolicited_report_interval,
4878 .maxlen = sizeof(int),
4880 .proc_handler = proc_dointvec_ms_jiffies,
4883 .procname = "mldv2_unsolicited_report_interval",
4885 &ipv6_devconf.mldv2_unsolicited_report_interval,
4886 .maxlen = sizeof(int),
4888 .proc_handler = proc_dointvec_ms_jiffies,
4890 #ifdef CONFIG_IPV6_PRIVACY
4892 .procname = "use_tempaddr",
4893 .data = &ipv6_devconf.use_tempaddr,
4894 .maxlen = sizeof(int),
4896 .proc_handler = proc_dointvec,
4899 .procname = "temp_valid_lft",
4900 .data = &ipv6_devconf.temp_valid_lft,
4901 .maxlen = sizeof(int),
4903 .proc_handler = proc_dointvec,
4906 .procname = "temp_prefered_lft",
4907 .data = &ipv6_devconf.temp_prefered_lft,
4908 .maxlen = sizeof(int),
4910 .proc_handler = proc_dointvec,
4913 .procname = "regen_max_retry",
4914 .data = &ipv6_devconf.regen_max_retry,
4915 .maxlen = sizeof(int),
4917 .proc_handler = proc_dointvec,
4920 .procname = "max_desync_factor",
4921 .data = &ipv6_devconf.max_desync_factor,
4922 .maxlen = sizeof(int),
4924 .proc_handler = proc_dointvec,
4928 .procname = "max_addresses",
4929 .data = &ipv6_devconf.max_addresses,
4930 .maxlen = sizeof(int),
4932 .proc_handler = proc_dointvec,
4935 .procname = "accept_ra_defrtr",
4936 .data = &ipv6_devconf.accept_ra_defrtr,
4937 .maxlen = sizeof(int),
4939 .proc_handler = proc_dointvec,
4942 .procname = "accept_ra_pinfo",
4943 .data = &ipv6_devconf.accept_ra_pinfo,
4944 .maxlen = sizeof(int),
4946 .proc_handler = proc_dointvec,
4948 #ifdef CONFIG_IPV6_ROUTER_PREF
4950 .procname = "accept_ra_rtr_pref",
4951 .data = &ipv6_devconf.accept_ra_rtr_pref,
4952 .maxlen = sizeof(int),
4954 .proc_handler = proc_dointvec,
4957 .procname = "router_probe_interval",
4958 .data = &ipv6_devconf.rtr_probe_interval,
4959 .maxlen = sizeof(int),
4961 .proc_handler = proc_dointvec_jiffies,
4963 #ifdef CONFIG_IPV6_ROUTE_INFO
4965 .procname = "accept_ra_rt_info_max_plen",
4966 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4967 .maxlen = sizeof(int),
4969 .proc_handler = proc_dointvec,
4974 .procname = "proxy_ndp",
4975 .data = &ipv6_devconf.proxy_ndp,
4976 .maxlen = sizeof(int),
4978 .proc_handler = proc_dointvec,
4981 .procname = "accept_source_route",
4982 .data = &ipv6_devconf.accept_source_route,
4983 .maxlen = sizeof(int),
4985 .proc_handler = proc_dointvec,
4987 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4989 .procname = "optimistic_dad",
4990 .data = &ipv6_devconf.optimistic_dad,
4991 .maxlen = sizeof(int),
4993 .proc_handler = proc_dointvec,
4997 #ifdef CONFIG_IPV6_MROUTE
4999 .procname = "mc_forwarding",
5000 .data = &ipv6_devconf.mc_forwarding,
5001 .maxlen = sizeof(int),
5003 .proc_handler = proc_dointvec,
5007 .procname = "disable_ipv6",
5008 .data = &ipv6_devconf.disable_ipv6,
5009 .maxlen = sizeof(int),
5011 .proc_handler = addrconf_sysctl_disable,
5014 .procname = "accept_dad",
5015 .data = &ipv6_devconf.accept_dad,
5016 .maxlen = sizeof(int),
5018 .proc_handler = proc_dointvec,
5021 .procname = "force_tllao",
5022 .data = &ipv6_devconf.force_tllao,
5023 .maxlen = sizeof(int),
5025 .proc_handler = proc_dointvec
5028 .procname = "ndisc_notify",
5029 .data = &ipv6_devconf.ndisc_notify,
5030 .maxlen = sizeof(int),
5032 .proc_handler = proc_dointvec
5040 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
5041 struct inet6_dev *idev, struct ipv6_devconf *p)
5044 struct addrconf_sysctl_table *t;
5045 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
5047 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
5051 for (i = 0; t->addrconf_vars[i].data; i++) {
5052 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
5053 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
5054 t->addrconf_vars[i].extra2 = net;
5057 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
5059 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
5060 if (t->sysctl_header == NULL)
5072 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5074 struct addrconf_sysctl_table *t;
5076 if (p->sysctl == NULL)
5081 unregister_net_sysctl_table(t->sysctl_header);
5085 static void addrconf_sysctl_register(struct inet6_dev *idev)
5087 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
5088 &ndisc_ifinfo_sysctl_change);
5089 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
5093 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
5095 __addrconf_sysctl_unregister(&idev->cnf);
5096 neigh_sysctl_unregister(idev->nd_parms);
5102 static int __net_init addrconf_init_net(struct net *net)
5105 struct ipv6_devconf *all, *dflt;
5107 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
5111 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
5113 goto err_alloc_dflt;
5115 /* these will be inherited by all namespaces */
5116 dflt->autoconf = ipv6_defaults.autoconf;
5117 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
5119 net->ipv6.devconf_all = all;
5120 net->ipv6.devconf_dflt = dflt;
5122 #ifdef CONFIG_SYSCTL
5123 err = __addrconf_sysctl_register(net, "all", NULL, all);
5127 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
5133 #ifdef CONFIG_SYSCTL
5135 __addrconf_sysctl_unregister(all);
5145 static void __net_exit addrconf_exit_net(struct net *net)
5147 #ifdef CONFIG_SYSCTL
5148 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5149 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5151 if (!net_eq(net, &init_net)) {
5152 kfree(net->ipv6.devconf_dflt);
5153 kfree(net->ipv6.devconf_all);
5157 static struct pernet_operations addrconf_ops = {
5158 .init = addrconf_init_net,
5159 .exit = addrconf_exit_net,
5162 static struct rtnl_af_ops inet6_ops = {
5164 .fill_link_af = inet6_fill_link_af,
5165 .get_link_af_size = inet6_get_link_af_size,
5166 .set_link_af = inet6_set_link_af,
5170 * Init / cleanup code
5173 int __init addrconf_init(void)
5177 err = ipv6_addr_label_init();
5179 pr_crit("%s: cannot initialize default policy table: %d\n",
5184 err = register_pernet_subsys(&addrconf_ops);
5188 /* The addrconf netdev notifier requires that loopback_dev
5189 * has it's ipv6 private information allocated and setup
5190 * before it can bring up and give link-local addresses
5191 * to other devices which are up.
5193 * Unfortunately, loopback_dev is not necessarily the first
5194 * entry in the global dev_base list of net devices. In fact,
5195 * it is likely to be the very last entry on that list.
5196 * So this causes the notifier registry below to try and
5197 * give link-local addresses to all devices besides loopback_dev
5198 * first, then loopback_dev, which cases all the non-loopback_dev
5199 * devices to fail to get a link-local address.
5201 * So, as a temporary fix, allocate the ipv6 structure for
5202 * loopback_dev first by hand.
5203 * Longer term, all of the dependencies ipv6 has upon the loopback
5204 * device and it being up should be removed.
5207 if (!ipv6_add_dev(init_net.loopback_dev))
5213 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5214 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5216 register_netdevice_notifier(&ipv6_dev_notf);
5220 err = rtnl_af_register(&inet6_ops);
5224 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5229 /* Only the first call to __rtnl_register can fail */
5230 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5231 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5232 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5233 inet6_dump_ifaddr, NULL);
5234 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5235 inet6_dump_ifmcaddr, NULL);
5236 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5237 inet6_dump_ifacaddr, NULL);
5238 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
5239 inet6_netconf_dump_devconf, NULL);
5241 ipv6_addr_label_rtnl_register();
5245 rtnl_af_unregister(&inet6_ops);
5247 unregister_netdevice_notifier(&ipv6_dev_notf);
5249 unregister_pernet_subsys(&addrconf_ops);
5251 ipv6_addr_label_cleanup();
5256 void addrconf_cleanup(void)
5258 struct net_device *dev;
5261 unregister_netdevice_notifier(&ipv6_dev_notf);
5262 unregister_pernet_subsys(&addrconf_ops);
5263 ipv6_addr_label_cleanup();
5267 __rtnl_af_unregister(&inet6_ops);
5269 /* clean dev list */
5270 for_each_netdev(&init_net, dev) {
5271 if (__in6_dev_get(dev) == NULL)
5273 addrconf_ifdown(dev, 1);
5275 addrconf_ifdown(init_net.loopback_dev, 2);
5280 spin_lock_bh(&addrconf_hash_lock);
5281 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5282 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5283 spin_unlock_bh(&addrconf_hash_lock);
5285 del_timer(&addr_chk_timer);