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>
86 #include <linux/random.h>
87 #include <linux/uaccess.h>
88 #include <asm/unaligned.h>
90 #include <linux/proc_fs.h>
91 #include <linux/seq_file.h>
92 #include <linux/export.h>
94 /* Set to 3 to get tracing... */
98 #define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
100 #define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
103 #define INFINITY_LIFE_TIME 0xFFFFFFFF
105 static inline u32 cstamp_delta(unsigned long cstamp)
107 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
111 static void addrconf_sysctl_register(struct inet6_dev *idev);
112 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
114 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
118 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
123 static void __ipv6_regen_rndid(struct inet6_dev *idev);
124 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
125 static void ipv6_regen_rndid(unsigned long data);
127 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
128 static int ipv6_count_addresses(struct inet6_dev *idev);
131 * Configured unicast address hash table
133 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
134 static DEFINE_SPINLOCK(addrconf_hash_lock);
136 static void addrconf_verify(unsigned long);
138 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
139 static DEFINE_SPINLOCK(addrconf_verify_lock);
141 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
142 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
144 static void addrconf_type_change(struct net_device *dev,
145 unsigned long event);
146 static int addrconf_ifdown(struct net_device *dev, int how);
148 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
150 const struct net_device *dev,
151 u32 flags, u32 noflags);
153 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
154 static void addrconf_dad_timer(unsigned long data);
155 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
156 static void addrconf_dad_run(struct inet6_dev *idev);
157 static void addrconf_rs_timer(unsigned long data);
158 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
159 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
161 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
162 struct prefix_info *pinfo);
163 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
164 struct net_device *dev);
166 static struct ipv6_devconf ipv6_devconf __read_mostly = {
168 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
169 .mtu6 = IPV6_MIN_MTU,
171 .accept_redirects = 1,
173 .force_mld_version = 0,
174 .mldv1_unsolicited_report_interval = 10 * HZ,
175 .mldv2_unsolicited_report_interval = HZ,
177 .rtr_solicits = MAX_RTR_SOLICITATIONS,
178 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
179 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
181 .temp_valid_lft = TEMP_VALID_LIFETIME,
182 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
183 .regen_max_retry = REGEN_MAX_RETRY,
184 .max_desync_factor = MAX_DESYNC_FACTOR,
185 .max_addresses = IPV6_MAX_ADDRESSES,
186 .accept_ra_defrtr = 1,
187 .accept_ra_pinfo = 1,
188 #ifdef CONFIG_IPV6_ROUTER_PREF
189 .accept_ra_rtr_pref = 1,
190 .rtr_probe_interval = 60 * HZ,
191 #ifdef CONFIG_IPV6_ROUTE_INFO
192 .accept_ra_rt_info_max_plen = 0,
196 .accept_source_route = 0, /* we do not accept RH0 by default. */
199 .suppress_frag_ndisc = 1,
202 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
204 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
205 .mtu6 = IPV6_MIN_MTU,
207 .accept_redirects = 1,
209 .force_mld_version = 0,
210 .mldv1_unsolicited_report_interval = 10 * HZ,
211 .mldv2_unsolicited_report_interval = HZ,
213 .rtr_solicits = MAX_RTR_SOLICITATIONS,
214 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
215 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
217 .temp_valid_lft = TEMP_VALID_LIFETIME,
218 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
219 .regen_max_retry = REGEN_MAX_RETRY,
220 .max_desync_factor = MAX_DESYNC_FACTOR,
221 .max_addresses = IPV6_MAX_ADDRESSES,
222 .accept_ra_defrtr = 1,
223 .accept_ra_pinfo = 1,
224 #ifdef CONFIG_IPV6_ROUTER_PREF
225 .accept_ra_rtr_pref = 1,
226 .rtr_probe_interval = 60 * HZ,
227 #ifdef CONFIG_IPV6_ROUTE_INFO
228 .accept_ra_rt_info_max_plen = 0,
232 .accept_source_route = 0, /* we do not accept RH0 by default. */
235 .suppress_frag_ndisc = 1,
238 /* Check if a valid qdisc is available */
239 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
241 return !qdisc_tx_is_noop(dev);
244 static void addrconf_del_rs_timer(struct inet6_dev *idev)
246 if (del_timer(&idev->rs_timer))
250 static void addrconf_del_dad_timer(struct inet6_ifaddr *ifp)
252 if (del_timer(&ifp->dad_timer))
256 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
259 if (!timer_pending(&idev->rs_timer))
261 mod_timer(&idev->rs_timer, jiffies + when);
264 static void addrconf_mod_dad_timer(struct inet6_ifaddr *ifp,
267 if (!timer_pending(&ifp->dad_timer))
269 mod_timer(&ifp->dad_timer, jiffies + when);
272 static int snmp6_alloc_dev(struct inet6_dev *idev)
276 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
277 sizeof(struct ipstats_mib),
278 __alignof__(struct ipstats_mib)) < 0)
281 for_each_possible_cpu(i) {
282 struct ipstats_mib *addrconf_stats;
283 addrconf_stats = per_cpu_ptr(idev->stats.ipv6[0], i);
284 u64_stats_init(&addrconf_stats->syncp);
285 #if SNMP_ARRAY_SZ == 2
286 addrconf_stats = per_cpu_ptr(idev->stats.ipv6[1], i);
287 u64_stats_init(&addrconf_stats->syncp);
292 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
294 if (!idev->stats.icmpv6dev)
296 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
298 if (!idev->stats.icmpv6msgdev)
304 kfree(idev->stats.icmpv6dev);
306 snmp_mib_free((void __percpu **)idev->stats.ipv6);
311 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
313 struct inet6_dev *ndev;
317 if (dev->mtu < IPV6_MIN_MTU)
320 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
325 rwlock_init(&ndev->lock);
327 INIT_LIST_HEAD(&ndev->addr_list);
328 setup_timer(&ndev->rs_timer, addrconf_rs_timer,
329 (unsigned long)ndev);
330 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
331 ndev->cnf.mtu6 = dev->mtu;
332 ndev->cnf.sysctl = NULL;
333 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
334 if (ndev->nd_parms == NULL) {
338 if (ndev->cnf.forwarding)
339 dev_disable_lro(dev);
340 /* We refer to the device */
343 if (snmp6_alloc_dev(ndev) < 0) {
345 "%s: cannot allocate memory for statistics; dev=%s.\n",
346 __func__, dev->name);
347 neigh_parms_release(&nd_tbl, ndev->nd_parms);
353 if (snmp6_register_dev(ndev) < 0) {
355 "%s: cannot create /proc/net/dev_snmp6/%s\n",
356 __func__, dev->name);
357 neigh_parms_release(&nd_tbl, ndev->nd_parms);
359 in6_dev_finish_destroy(ndev);
363 /* One reference from device. We must do this before
364 * we invoke __ipv6_regen_rndid().
368 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
369 ndev->cnf.accept_dad = -1;
371 #if IS_ENABLED(CONFIG_IPV6_SIT)
372 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
373 pr_info("%s: Disabled Multicast RS\n", dev->name);
374 ndev->cnf.rtr_solicits = 0;
378 INIT_LIST_HEAD(&ndev->tempaddr_list);
379 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
380 if ((dev->flags&IFF_LOOPBACK) ||
381 dev->type == ARPHRD_TUNNEL ||
382 dev->type == ARPHRD_TUNNEL6 ||
383 dev->type == ARPHRD_SIT ||
384 dev->type == ARPHRD_NONE) {
385 ndev->cnf.use_tempaddr = -1;
388 ipv6_regen_rndid((unsigned long) ndev);
391 ndev->token = in6addr_any;
393 if (netif_running(dev) && addrconf_qdisc_ok(dev))
394 ndev->if_flags |= IF_READY;
396 ipv6_mc_init_dev(ndev);
397 ndev->tstamp = jiffies;
398 addrconf_sysctl_register(ndev);
399 /* protected by rtnl_lock */
400 rcu_assign_pointer(dev->ip6_ptr, ndev);
402 /* Join interface-local all-node multicast group */
403 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
405 /* Join all-node multicast group */
406 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
408 /* Join all-router multicast group if forwarding is set */
409 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
410 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
415 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
417 struct inet6_dev *idev;
421 idev = __in6_dev_get(dev);
423 idev = ipv6_add_dev(dev);
428 if (dev->flags&IFF_UP)
433 static int inet6_netconf_msgsize_devconf(int type)
435 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
436 + nla_total_size(4); /* NETCONFA_IFINDEX */
438 /* type -1 is used for ALL */
439 if (type == -1 || type == NETCONFA_FORWARDING)
440 size += nla_total_size(4);
441 #ifdef CONFIG_IPV6_MROUTE
442 if (type == -1 || type == NETCONFA_MC_FORWARDING)
443 size += nla_total_size(4);
445 if (type == -1 || type == NETCONFA_PROXY_NEIGH)
446 size += nla_total_size(4);
451 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
452 struct ipv6_devconf *devconf, u32 portid,
453 u32 seq, int event, unsigned int flags,
456 struct nlmsghdr *nlh;
457 struct netconfmsg *ncm;
459 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
464 ncm = nlmsg_data(nlh);
465 ncm->ncm_family = AF_INET6;
467 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
468 goto nla_put_failure;
470 /* type -1 is used for ALL */
471 if ((type == -1 || type == NETCONFA_FORWARDING) &&
472 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
473 goto nla_put_failure;
474 #ifdef CONFIG_IPV6_MROUTE
475 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
476 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
477 devconf->mc_forwarding) < 0)
478 goto nla_put_failure;
480 if ((type == -1 || type == NETCONFA_PROXY_NEIGH) &&
481 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
482 goto nla_put_failure;
484 return nlmsg_end(skb, nlh);
487 nlmsg_cancel(skb, nlh);
491 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
492 struct ipv6_devconf *devconf)
497 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
501 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
502 RTM_NEWNETCONF, 0, type);
504 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
505 WARN_ON(err == -EMSGSIZE);
509 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
512 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
515 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
516 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
517 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
518 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
521 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
522 struct nlmsghdr *nlh)
524 struct net *net = sock_net(in_skb->sk);
525 struct nlattr *tb[NETCONFA_MAX+1];
526 struct netconfmsg *ncm;
528 struct ipv6_devconf *devconf;
529 struct inet6_dev *in6_dev;
530 struct net_device *dev;
534 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
535 devconf_ipv6_policy);
540 if (!tb[NETCONFA_IFINDEX])
543 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
545 case NETCONFA_IFINDEX_ALL:
546 devconf = net->ipv6.devconf_all;
548 case NETCONFA_IFINDEX_DEFAULT:
549 devconf = net->ipv6.devconf_dflt;
552 dev = __dev_get_by_index(net, ifindex);
555 in6_dev = __in6_dev_get(dev);
558 devconf = &in6_dev->cnf;
563 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
567 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
568 NETLINK_CB(in_skb).portid,
569 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
572 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
573 WARN_ON(err == -EMSGSIZE);
577 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
582 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
583 struct netlink_callback *cb)
585 struct net *net = sock_net(skb->sk);
588 struct net_device *dev;
589 struct inet6_dev *idev;
590 struct hlist_head *head;
593 s_idx = idx = cb->args[1];
595 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
597 head = &net->dev_index_head[h];
599 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
601 hlist_for_each_entry_rcu(dev, head, index_hlist) {
604 idev = __in6_dev_get(dev);
608 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
610 NETLINK_CB(cb->skb).portid,
618 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
624 if (h == NETDEV_HASHENTRIES) {
625 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
626 net->ipv6.devconf_all,
627 NETLINK_CB(cb->skb).portid,
629 RTM_NEWNETCONF, NLM_F_MULTI,
635 if (h == NETDEV_HASHENTRIES + 1) {
636 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
637 net->ipv6.devconf_dflt,
638 NETLINK_CB(cb->skb).portid,
640 RTM_NEWNETCONF, NLM_F_MULTI,
654 static void dev_forward_change(struct inet6_dev *idev)
656 struct net_device *dev;
657 struct inet6_ifaddr *ifa;
662 if (idev->cnf.forwarding)
663 dev_disable_lro(dev);
664 if (dev->flags & IFF_MULTICAST) {
665 if (idev->cnf.forwarding) {
666 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
667 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
668 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
670 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
671 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
672 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
676 list_for_each_entry(ifa, &idev->addr_list, if_list) {
677 if (ifa->flags&IFA_F_TENTATIVE)
679 if (idev->cnf.forwarding)
680 addrconf_join_anycast(ifa);
682 addrconf_leave_anycast(ifa);
684 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
685 dev->ifindex, &idev->cnf);
689 static void addrconf_forward_change(struct net *net, __s32 newf)
691 struct net_device *dev;
692 struct inet6_dev *idev;
694 for_each_netdev(net, dev) {
695 idev = __in6_dev_get(dev);
697 int changed = (!idev->cnf.forwarding) ^ (!newf);
698 idev->cnf.forwarding = newf;
700 dev_forward_change(idev);
705 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
711 return restart_syscall();
713 net = (struct net *)table->extra2;
717 if (p == &net->ipv6.devconf_dflt->forwarding) {
718 if ((!newf) ^ (!old))
719 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
720 NETCONFA_IFINDEX_DEFAULT,
721 net->ipv6.devconf_dflt);
726 if (p == &net->ipv6.devconf_all->forwarding) {
727 net->ipv6.devconf_dflt->forwarding = newf;
728 addrconf_forward_change(net, newf);
729 if ((!newf) ^ (!old))
730 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
731 NETCONFA_IFINDEX_ALL,
732 net->ipv6.devconf_all);
733 } else if ((!newf) ^ (!old))
734 dev_forward_change((struct inet6_dev *)table->extra1);
738 rt6_purge_dflt_routers(net);
743 /* Nobody refers to this ifaddr, destroy it */
744 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
746 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
748 #ifdef NET_REFCNT_DEBUG
749 pr_debug("%s\n", __func__);
752 in6_dev_put(ifp->idev);
754 if (del_timer(&ifp->dad_timer))
755 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
757 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
758 pr_warn("Freeing alive inet6 address %p\n", ifp);
767 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
770 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
773 * Each device address list is sorted in order of scope -
774 * global before linklocal.
776 list_for_each(p, &idev->addr_list) {
777 struct inet6_ifaddr *ifa
778 = list_entry(p, struct inet6_ifaddr, if_list);
779 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
783 list_add_tail(&ifp->if_list, p);
786 static u32 inet6_addr_hash(const struct in6_addr *addr)
788 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
791 /* On success it returns ifp with increased reference count */
793 static struct inet6_ifaddr *
794 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
795 const struct in6_addr *peer_addr, int pfxlen,
796 int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
798 struct inet6_ifaddr *ifa = NULL;
802 int addr_type = ipv6_addr_type(addr);
804 if (addr_type == IPV6_ADDR_ANY ||
805 addr_type & IPV6_ADDR_MULTICAST ||
806 (!(idev->dev->flags & IFF_LOOPBACK) &&
807 addr_type & IPV6_ADDR_LOOPBACK))
808 return ERR_PTR(-EADDRNOTAVAIL);
812 err = -ENODEV; /*XXX*/
816 if (idev->cnf.disable_ipv6) {
821 spin_lock(&addrconf_hash_lock);
823 /* Ignore adding duplicate addresses on an interface */
824 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
825 ADBG("ipv6_add_addr: already assigned\n");
830 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
833 ADBG("ipv6_add_addr: malloc failed\n");
838 rt = addrconf_dst_alloc(idev, addr, false);
844 neigh_parms_data_state_setall(idev->nd_parms);
848 ifa->peer_addr = *peer_addr;
850 spin_lock_init(&ifa->lock);
851 spin_lock_init(&ifa->state_lock);
852 setup_timer(&ifa->dad_timer, addrconf_dad_timer,
854 INIT_HLIST_NODE(&ifa->addr_lst);
856 ifa->prefix_len = pfxlen;
857 ifa->flags = flags | IFA_F_TENTATIVE;
858 ifa->valid_lft = valid_lft;
859 ifa->prefered_lft = prefered_lft;
860 ifa->cstamp = ifa->tstamp = jiffies;
861 ifa->tokenized = false;
870 /* Add to big hash table */
871 hash = inet6_addr_hash(addr);
873 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
874 spin_unlock(&addrconf_hash_lock);
876 write_lock(&idev->lock);
877 /* Add to inet6_dev unicast addr list. */
878 ipv6_link_dev_addr(idev, ifa);
880 if (ifa->flags&IFA_F_TEMPORARY) {
881 list_add(&ifa->tmp_list, &idev->tempaddr_list);
886 write_unlock(&idev->lock);
888 rcu_read_unlock_bh();
890 if (likely(err == 0))
891 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
899 spin_unlock(&addrconf_hash_lock);
903 enum cleanup_prefix_rt_t {
904 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
905 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
906 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
910 * Check, whether the prefix for ifp would still need a prefix route
911 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
914 * 1) we don't purge prefix if address was not permanent.
915 * prefix is managed by its own lifetime.
916 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
917 * 3) if there are no addresses, delete prefix.
918 * 4) if there are still other permanent address(es),
919 * corresponding prefix is still permanent.
920 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
921 * don't purge the prefix, assume user space is managing it.
922 * 6) otherwise, update prefix lifetime to the
923 * longest valid lifetime among the corresponding
924 * addresses on the device.
925 * Note: subsequent RA will update lifetime.
927 static enum cleanup_prefix_rt_t
928 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
930 struct inet6_ifaddr *ifa;
931 struct inet6_dev *idev = ifp->idev;
932 unsigned long lifetime;
933 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
937 list_for_each_entry(ifa, &idev->addr_list, if_list) {
940 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
943 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
944 return CLEANUP_PREFIX_RT_NOP;
946 action = CLEANUP_PREFIX_RT_EXPIRE;
948 spin_lock(&ifa->lock);
950 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
952 * Note: Because this address is
953 * not permanent, lifetime <
954 * LONG_MAX / HZ here.
956 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
957 *expires = ifa->tstamp + lifetime * HZ;
958 spin_unlock(&ifa->lock);
965 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
969 rt = addrconf_get_prefix_route(&ifp->addr,
972 0, RTF_GATEWAY | RTF_DEFAULT);
977 if (!(rt->rt6i_flags & RTF_EXPIRES))
978 rt6_set_expires(rt, expires);
985 /* This function wants to get referenced ifp and releases it before return */
987 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
990 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
991 unsigned long expires;
993 spin_lock_bh(&ifp->state_lock);
995 ifp->state = INET6_IFADDR_STATE_DEAD;
996 spin_unlock_bh(&ifp->state_lock);
998 if (state == INET6_IFADDR_STATE_DEAD)
1001 spin_lock_bh(&addrconf_hash_lock);
1002 hlist_del_init_rcu(&ifp->addr_lst);
1003 spin_unlock_bh(&addrconf_hash_lock);
1005 write_lock_bh(&ifp->idev->lock);
1007 if (ifp->flags&IFA_F_TEMPORARY) {
1008 list_del(&ifp->tmp_list);
1010 in6_ifa_put(ifp->ifpub);
1016 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1017 action = check_cleanup_prefix_route(ifp, &expires);
1019 list_del_init(&ifp->if_list);
1022 write_unlock_bh(&ifp->idev->lock);
1024 addrconf_del_dad_timer(ifp);
1026 ipv6_ifa_notify(RTM_DELADDR, ifp);
1028 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1030 if (action != CLEANUP_PREFIX_RT_NOP) {
1031 cleanup_prefix_route(ifp, expires,
1032 action == CLEANUP_PREFIX_RT_DEL);
1035 /* clean up prefsrc entries */
1036 rt6_remove_prefsrc(ifp);
1041 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1043 struct inet6_dev *idev = ifp->idev;
1044 struct in6_addr addr, *tmpaddr;
1045 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1046 unsigned long regen_advance;
1050 unsigned long now = jiffies;
1052 write_lock_bh(&idev->lock);
1054 spin_lock_bh(&ift->lock);
1055 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1056 spin_unlock_bh(&ift->lock);
1063 if (idev->cnf.use_tempaddr <= 0) {
1064 write_unlock_bh(&idev->lock);
1065 pr_info("%s: use_tempaddr is disabled\n", __func__);
1070 spin_lock_bh(&ifp->lock);
1071 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1072 idev->cnf.use_tempaddr = -1; /*XXX*/
1073 spin_unlock_bh(&ifp->lock);
1074 write_unlock_bh(&idev->lock);
1075 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1082 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1083 __ipv6_try_regen_rndid(idev, tmpaddr);
1084 memcpy(&addr.s6_addr[8], idev->rndid, 8);
1085 age = (now - ifp->tstamp) / HZ;
1086 tmp_valid_lft = min_t(__u32,
1088 idev->cnf.temp_valid_lft + age);
1089 tmp_prefered_lft = min_t(__u32,
1091 idev->cnf.temp_prefered_lft + age -
1092 idev->cnf.max_desync_factor);
1093 tmp_plen = ifp->prefix_len;
1094 tmp_tstamp = ifp->tstamp;
1095 spin_unlock_bh(&ifp->lock);
1097 regen_advance = idev->cnf.regen_max_retry *
1098 idev->cnf.dad_transmits *
1099 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1100 write_unlock_bh(&idev->lock);
1102 /* A temporary address is created only if this calculated Preferred
1103 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1104 * an implementation must not create a temporary address with a zero
1105 * Preferred Lifetime.
1106 * Use age calculation as in addrconf_verify to avoid unnecessary
1107 * temporary addresses being generated.
1109 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1110 if (tmp_prefered_lft <= regen_advance + age) {
1117 addr_flags = IFA_F_TEMPORARY;
1118 /* set in addrconf_prefix_rcv() */
1119 if (ifp->flags & IFA_F_OPTIMISTIC)
1120 addr_flags |= IFA_F_OPTIMISTIC;
1122 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1123 ipv6_addr_scope(&addr), addr_flags,
1124 tmp_valid_lft, tmp_prefered_lft);
1128 pr_info("%s: retry temporary address regeneration\n", __func__);
1130 write_lock_bh(&idev->lock);
1134 spin_lock_bh(&ift->lock);
1137 ift->tstamp = tmp_tstamp;
1138 spin_unlock_bh(&ift->lock);
1140 addrconf_dad_start(ift);
1148 * Choose an appropriate source address (RFC3484)
1151 IPV6_SADDR_RULE_INIT = 0,
1152 IPV6_SADDR_RULE_LOCAL,
1153 IPV6_SADDR_RULE_SCOPE,
1154 IPV6_SADDR_RULE_PREFERRED,
1155 #ifdef CONFIG_IPV6_MIP6
1156 IPV6_SADDR_RULE_HOA,
1158 IPV6_SADDR_RULE_OIF,
1159 IPV6_SADDR_RULE_LABEL,
1160 IPV6_SADDR_RULE_PRIVACY,
1161 IPV6_SADDR_RULE_ORCHID,
1162 IPV6_SADDR_RULE_PREFIX,
1166 struct ipv6_saddr_score {
1169 struct inet6_ifaddr *ifa;
1170 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1175 struct ipv6_saddr_dst {
1176 const struct in6_addr *addr;
1183 static inline int ipv6_saddr_preferred(int type)
1185 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1190 static int ipv6_get_saddr_eval(struct net *net,
1191 struct ipv6_saddr_score *score,
1192 struct ipv6_saddr_dst *dst,
1197 if (i <= score->rule) {
1199 case IPV6_SADDR_RULE_SCOPE:
1200 ret = score->scopedist;
1202 case IPV6_SADDR_RULE_PREFIX:
1203 ret = score->matchlen;
1206 ret = !!test_bit(i, score->scorebits);
1212 case IPV6_SADDR_RULE_INIT:
1213 /* Rule 0: remember if hiscore is not ready yet */
1216 case IPV6_SADDR_RULE_LOCAL:
1217 /* Rule 1: Prefer same address */
1218 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1220 case IPV6_SADDR_RULE_SCOPE:
1221 /* Rule 2: Prefer appropriate scope
1226 * ---+--+-+---> scope
1228 * | d is scope of the destination.
1230 * | \ <- smaller scope is better if
1231 * B-15 | \ if scope is enough for destination.
1232 * | ret = B - scope (-1 <= scope >= d <= 15).
1234 * |/ <- greater is better
1235 * -C / if scope is not enough for destination.
1236 * /| ret = scope - C (-1 <= d < scope <= 15).
1238 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1239 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1240 * Assume B = 0 and we get C > 29.
1242 ret = __ipv6_addr_src_scope(score->addr_type);
1243 if (ret >= dst->scope)
1246 ret -= 128; /* 30 is enough */
1247 score->scopedist = ret;
1249 case IPV6_SADDR_RULE_PREFERRED:
1250 /* Rule 3: Avoid deprecated and optimistic addresses */
1251 ret = ipv6_saddr_preferred(score->addr_type) ||
1252 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1254 #ifdef CONFIG_IPV6_MIP6
1255 case IPV6_SADDR_RULE_HOA:
1257 /* Rule 4: Prefer home address */
1258 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1259 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1263 case IPV6_SADDR_RULE_OIF:
1264 /* Rule 5: Prefer outgoing interface */
1265 ret = (!dst->ifindex ||
1266 dst->ifindex == score->ifa->idev->dev->ifindex);
1268 case IPV6_SADDR_RULE_LABEL:
1269 /* Rule 6: Prefer matching label */
1270 ret = ipv6_addr_label(net,
1271 &score->ifa->addr, score->addr_type,
1272 score->ifa->idev->dev->ifindex) == dst->label;
1274 case IPV6_SADDR_RULE_PRIVACY:
1276 /* Rule 7: Prefer public address
1277 * Note: prefer temporary address if use_tempaddr >= 2
1279 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1280 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1281 score->ifa->idev->cnf.use_tempaddr >= 2;
1282 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1285 case IPV6_SADDR_RULE_ORCHID:
1286 /* Rule 8-: Prefer ORCHID vs ORCHID or
1287 * non-ORCHID vs non-ORCHID
1289 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1290 ipv6_addr_orchid(dst->addr));
1292 case IPV6_SADDR_RULE_PREFIX:
1293 /* Rule 8: Use longest matching prefix */
1294 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1295 if (ret > score->ifa->prefix_len)
1296 ret = score->ifa->prefix_len;
1297 score->matchlen = ret;
1304 __set_bit(i, score->scorebits);
1310 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1311 const struct in6_addr *daddr, unsigned int prefs,
1312 struct in6_addr *saddr)
1314 struct ipv6_saddr_score scores[2],
1315 *score = &scores[0], *hiscore = &scores[1];
1316 struct ipv6_saddr_dst dst;
1317 struct net_device *dev;
1320 dst_type = __ipv6_addr_type(daddr);
1322 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1323 dst.scope = __ipv6_addr_src_scope(dst_type);
1324 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1328 hiscore->ifa = NULL;
1332 for_each_netdev_rcu(net, dev) {
1333 struct inet6_dev *idev;
1335 /* Candidate Source Address (section 4)
1336 * - multicast and link-local destination address,
1337 * the set of candidate source address MUST only
1338 * include addresses assigned to interfaces
1339 * belonging to the same link as the outgoing
1341 * (- For site-local destination addresses, the
1342 * set of candidate source addresses MUST only
1343 * include addresses assigned to interfaces
1344 * belonging to the same site as the outgoing
1347 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1348 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1349 dst.ifindex && dev->ifindex != dst.ifindex)
1352 idev = __in6_dev_get(dev);
1356 read_lock_bh(&idev->lock);
1357 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1361 * - Tentative Address (RFC2462 section 5.4)
1362 * - A tentative address is not considered
1363 * "assigned to an interface" in the traditional
1364 * sense, unless it is also flagged as optimistic.
1365 * - Candidate Source Address (section 4)
1366 * - In any case, anycast addresses, multicast
1367 * addresses, and the unspecified address MUST
1368 * NOT be included in a candidate set.
1370 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1371 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1374 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1376 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1377 score->addr_type & IPV6_ADDR_MULTICAST)) {
1378 LIMIT_NETDEBUG(KERN_DEBUG
1379 "ADDRCONF: unspecified / multicast address "
1380 "assigned as unicast address on %s",
1386 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1388 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1389 int minihiscore, miniscore;
1391 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1392 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1394 if (minihiscore > miniscore) {
1395 if (i == IPV6_SADDR_RULE_SCOPE &&
1396 score->scopedist > 0) {
1399 * each remaining entry
1400 * has too small (not enough)
1401 * scope, because ifa entries
1402 * are sorted by their scope
1408 } else if (minihiscore < miniscore) {
1410 in6_ifa_put(hiscore->ifa);
1412 in6_ifa_hold(score->ifa);
1414 swap(hiscore, score);
1416 /* restore our iterator */
1417 score->ifa = hiscore->ifa;
1424 read_unlock_bh(&idev->lock);
1429 return -EADDRNOTAVAIL;
1431 *saddr = hiscore->ifa->addr;
1432 in6_ifa_put(hiscore->ifa);
1435 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1437 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1440 struct inet6_ifaddr *ifp;
1441 int err = -EADDRNOTAVAIL;
1443 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1444 if (ifp->scope > IFA_LINK)
1446 if (ifp->scope == IFA_LINK &&
1447 !(ifp->flags & banned_flags)) {
1456 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1459 struct inet6_dev *idev;
1460 int err = -EADDRNOTAVAIL;
1463 idev = __in6_dev_get(dev);
1465 read_lock_bh(&idev->lock);
1466 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1467 read_unlock_bh(&idev->lock);
1473 static int ipv6_count_addresses(struct inet6_dev *idev)
1476 struct inet6_ifaddr *ifp;
1478 read_lock_bh(&idev->lock);
1479 list_for_each_entry(ifp, &idev->addr_list, if_list)
1481 read_unlock_bh(&idev->lock);
1485 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1486 const struct net_device *dev, int strict)
1488 struct inet6_ifaddr *ifp;
1489 unsigned int hash = inet6_addr_hash(addr);
1492 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1493 if (!net_eq(dev_net(ifp->idev->dev), net))
1495 if (ipv6_addr_equal(&ifp->addr, addr) &&
1496 !(ifp->flags&IFA_F_TENTATIVE) &&
1497 (dev == NULL || ifp->idev->dev == dev ||
1498 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1499 rcu_read_unlock_bh();
1504 rcu_read_unlock_bh();
1507 EXPORT_SYMBOL(ipv6_chk_addr);
1509 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1510 struct net_device *dev)
1512 unsigned int hash = inet6_addr_hash(addr);
1513 struct inet6_ifaddr *ifp;
1515 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1516 if (!net_eq(dev_net(ifp->idev->dev), net))
1518 if (ipv6_addr_equal(&ifp->addr, addr)) {
1519 if (dev == NULL || ifp->idev->dev == dev)
1526 /* Compares an address/prefix_len with addresses on device @dev.
1527 * If one is found it returns true.
1529 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1530 const unsigned int prefix_len, struct net_device *dev)
1532 struct inet6_dev *idev;
1533 struct inet6_ifaddr *ifa;
1537 idev = __in6_dev_get(dev);
1539 read_lock_bh(&idev->lock);
1540 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1541 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1545 read_unlock_bh(&idev->lock);
1551 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1553 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1555 struct inet6_dev *idev;
1556 struct inet6_ifaddr *ifa;
1561 idev = __in6_dev_get(dev);
1563 read_lock_bh(&idev->lock);
1564 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1565 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1570 read_unlock_bh(&idev->lock);
1575 EXPORT_SYMBOL(ipv6_chk_prefix);
1577 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1578 struct net_device *dev, int strict)
1580 struct inet6_ifaddr *ifp, *result = NULL;
1581 unsigned int hash = inet6_addr_hash(addr);
1584 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1585 if (!net_eq(dev_net(ifp->idev->dev), net))
1587 if (ipv6_addr_equal(&ifp->addr, addr)) {
1588 if (dev == NULL || ifp->idev->dev == dev ||
1589 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1596 rcu_read_unlock_bh();
1601 /* Gets referenced address, destroys ifaddr */
1603 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1605 if (ifp->flags&IFA_F_PERMANENT) {
1606 spin_lock_bh(&ifp->lock);
1607 addrconf_del_dad_timer(ifp);
1608 ifp->flags |= IFA_F_TENTATIVE;
1610 ifp->flags |= IFA_F_DADFAILED;
1611 spin_unlock_bh(&ifp->lock);
1613 ipv6_ifa_notify(0, ifp);
1615 } else if (ifp->flags&IFA_F_TEMPORARY) {
1616 struct inet6_ifaddr *ifpub;
1617 spin_lock_bh(&ifp->lock);
1620 in6_ifa_hold(ifpub);
1621 spin_unlock_bh(&ifp->lock);
1622 ipv6_create_tempaddr(ifpub, ifp);
1625 spin_unlock_bh(&ifp->lock);
1632 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1636 spin_lock(&ifp->state_lock);
1637 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1638 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1641 spin_unlock(&ifp->state_lock);
1646 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1648 struct inet6_dev *idev = ifp->idev;
1650 if (addrconf_dad_end(ifp)) {
1655 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1656 ifp->idev->dev->name, &ifp->addr);
1658 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1659 struct in6_addr addr;
1661 addr.s6_addr32[0] = htonl(0xfe800000);
1662 addr.s6_addr32[1] = 0;
1664 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1665 ipv6_addr_equal(&ifp->addr, &addr)) {
1666 /* DAD failed for link-local based on MAC address */
1667 idev->cnf.disable_ipv6 = 1;
1669 pr_info("%s: IPv6 being disabled!\n",
1670 ifp->idev->dev->name);
1674 addrconf_dad_stop(ifp, 1);
1677 /* Join to solicited addr multicast group. */
1679 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1681 struct in6_addr maddr;
1683 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1686 addrconf_addr_solict_mult(addr, &maddr);
1687 ipv6_dev_mc_inc(dev, &maddr);
1690 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1692 struct in6_addr maddr;
1694 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1697 addrconf_addr_solict_mult(addr, &maddr);
1698 __ipv6_dev_mc_dec(idev, &maddr);
1701 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1703 struct in6_addr addr;
1704 if (ifp->prefix_len >= 127) /* RFC 6164 */
1706 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1707 if (ipv6_addr_any(&addr))
1709 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1712 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1714 struct in6_addr addr;
1715 if (ifp->prefix_len >= 127) /* RFC 6164 */
1717 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1718 if (ipv6_addr_any(&addr))
1720 __ipv6_dev_ac_dec(ifp->idev, &addr);
1723 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1725 if (dev->addr_len != ETH_ALEN)
1727 memcpy(eui, dev->dev_addr, 3);
1728 memcpy(eui + 5, dev->dev_addr + 3, 3);
1731 * The zSeries OSA network cards can be shared among various
1732 * OS instances, but the OSA cards have only one MAC address.
1733 * This leads to duplicate address conflicts in conjunction
1734 * with IPv6 if more than one instance uses the same card.
1736 * The driver for these cards can deliver a unique 16-bit
1737 * identifier for each instance sharing the same card. It is
1738 * placed instead of 0xFFFE in the interface identifier. The
1739 * "u" bit of the interface identifier is not inverted in this
1740 * case. Hence the resulting interface identifier has local
1741 * scope according to RFC2373.
1744 eui[3] = (dev->dev_id >> 8) & 0xFF;
1745 eui[4] = dev->dev_id & 0xFF;
1754 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1756 if (dev->addr_len != IEEE802154_ADDR_LEN)
1758 memcpy(eui, dev->dev_addr, 8);
1763 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1765 union fwnet_hwaddr *ha;
1767 if (dev->addr_len != FWNET_ALEN)
1770 ha = (union fwnet_hwaddr *)dev->dev_addr;
1772 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1777 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1779 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1780 if (dev->addr_len != ARCNET_ALEN)
1783 eui[7] = *(u8 *)dev->dev_addr;
1787 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1789 if (dev->addr_len != INFINIBAND_ALEN)
1791 memcpy(eui, dev->dev_addr + 12, 8);
1796 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1800 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1801 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1802 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1803 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1804 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1805 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1809 memcpy(eui + 4, &addr, 4);
1813 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1815 if (dev->priv_flags & IFF_ISATAP)
1816 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1820 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1822 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1825 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
1827 memcpy(eui, dev->perm_addr, 3);
1828 memcpy(eui + 5, dev->perm_addr + 3, 3);
1835 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1837 switch (dev->type) {
1840 return addrconf_ifid_eui48(eui, dev);
1842 return addrconf_ifid_arcnet(eui, dev);
1843 case ARPHRD_INFINIBAND:
1844 return addrconf_ifid_infiniband(eui, dev);
1846 return addrconf_ifid_sit(eui, dev);
1848 return addrconf_ifid_gre(eui, dev);
1849 case ARPHRD_6LOWPAN:
1850 case ARPHRD_IEEE802154:
1851 return addrconf_ifid_eui64(eui, dev);
1852 case ARPHRD_IEEE1394:
1853 return addrconf_ifid_ieee1394(eui, dev);
1854 case ARPHRD_TUNNEL6:
1855 return addrconf_ifid_ip6tnl(eui, dev);
1860 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1863 struct inet6_ifaddr *ifp;
1865 read_lock_bh(&idev->lock);
1866 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1867 if (ifp->scope > IFA_LINK)
1869 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1870 memcpy(eui, ifp->addr.s6_addr+8, 8);
1875 read_unlock_bh(&idev->lock);
1879 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1880 static void __ipv6_regen_rndid(struct inet6_dev *idev)
1883 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1884 idev->rndid[0] &= ~0x02;
1887 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1888 * check if generated address is not inappropriate
1890 * - Reserved subnet anycast (RFC 2526)
1891 * 11111101 11....11 1xxxxxxx
1892 * - ISATAP (RFC4214) 6.1
1893 * 00-00-5E-FE-xx-xx-xx-xx
1895 * - XXX: already assigned to an address on the device
1897 if (idev->rndid[0] == 0xfd &&
1898 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1899 (idev->rndid[7]&0x80))
1901 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1902 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1904 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1909 static void ipv6_regen_rndid(unsigned long data)
1911 struct inet6_dev *idev = (struct inet6_dev *) data;
1912 unsigned long expires;
1915 write_lock_bh(&idev->lock);
1920 __ipv6_regen_rndid(idev);
1923 idev->cnf.temp_prefered_lft * HZ -
1924 idev->cnf.regen_max_retry * idev->cnf.dad_transmits *
1925 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) -
1926 idev->cnf.max_desync_factor * HZ;
1927 if (time_before(expires, jiffies)) {
1928 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
1929 __func__, idev->dev->name);
1933 if (!mod_timer(&idev->regen_timer, expires))
1937 write_unlock_bh(&idev->lock);
1938 rcu_read_unlock_bh();
1942 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
1944 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1945 __ipv6_regen_rndid(idev);
1953 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1954 unsigned long expires, u32 flags)
1956 struct fib6_config cfg = {
1957 .fc_table = RT6_TABLE_PREFIX,
1958 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1959 .fc_ifindex = dev->ifindex,
1960 .fc_expires = expires,
1962 .fc_flags = RTF_UP | flags,
1963 .fc_nlinfo.nl_net = dev_net(dev),
1964 .fc_protocol = RTPROT_KERNEL,
1969 /* Prevent useless cloning on PtP SIT.
1970 This thing is done here expecting that the whole
1971 class of non-broadcast devices need not cloning.
1973 #if IS_ENABLED(CONFIG_IPV6_SIT)
1974 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1975 cfg.fc_flags |= RTF_NONEXTHOP;
1978 ip6_route_add(&cfg);
1982 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
1984 const struct net_device *dev,
1985 u32 flags, u32 noflags)
1987 struct fib6_node *fn;
1988 struct rt6_info *rt = NULL;
1989 struct fib6_table *table;
1991 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
1995 read_lock_bh(&table->tb6_lock);
1996 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
1999 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2000 if (rt->dst.dev->ifindex != dev->ifindex)
2002 if ((rt->rt6i_flags & flags) != flags)
2004 if ((rt->rt6i_flags & noflags) != 0)
2010 read_unlock_bh(&table->tb6_lock);
2015 /* Create "default" multicast route to the interface */
2017 static void addrconf_add_mroute(struct net_device *dev)
2019 struct fib6_config cfg = {
2020 .fc_table = RT6_TABLE_LOCAL,
2021 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2022 .fc_ifindex = dev->ifindex,
2025 .fc_nlinfo.nl_net = dev_net(dev),
2028 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2030 ip6_route_add(&cfg);
2033 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2035 struct inet6_dev *idev;
2039 idev = ipv6_find_idev(dev);
2041 return ERR_PTR(-ENOBUFS);
2043 if (idev->cnf.disable_ipv6)
2044 return ERR_PTR(-EACCES);
2046 /* Add default multicast route */
2047 if (!(dev->flags & IFF_LOOPBACK))
2048 addrconf_add_mroute(dev);
2053 static void manage_tempaddrs(struct inet6_dev *idev,
2054 struct inet6_ifaddr *ifp,
2055 __u32 valid_lft, __u32 prefered_lft,
2056 bool create, unsigned long now)
2059 struct inet6_ifaddr *ift;
2061 read_lock_bh(&idev->lock);
2062 /* update all temporary addresses in the list */
2063 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2064 int age, max_valid, max_prefered;
2066 if (ifp != ift->ifpub)
2069 /* RFC 4941 section 3.3:
2070 * If a received option will extend the lifetime of a public
2071 * address, the lifetimes of temporary addresses should
2072 * be extended, subject to the overall constraint that no
2073 * temporary addresses should ever remain "valid" or "preferred"
2074 * for a time longer than (TEMP_VALID_LIFETIME) or
2075 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2077 age = (now - ift->cstamp) / HZ;
2078 max_valid = idev->cnf.temp_valid_lft - age;
2082 max_prefered = idev->cnf.temp_prefered_lft -
2083 idev->cnf.max_desync_factor - age;
2084 if (max_prefered < 0)
2087 if (valid_lft > max_valid)
2088 valid_lft = max_valid;
2090 if (prefered_lft > max_prefered)
2091 prefered_lft = max_prefered;
2093 spin_lock(&ift->lock);
2095 ift->valid_lft = valid_lft;
2096 ift->prefered_lft = prefered_lft;
2098 if (prefered_lft > 0)
2099 ift->flags &= ~IFA_F_DEPRECATED;
2101 spin_unlock(&ift->lock);
2102 if (!(flags&IFA_F_TENTATIVE))
2103 ipv6_ifa_notify(0, ift);
2106 if ((create || list_empty(&idev->tempaddr_list)) &&
2107 idev->cnf.use_tempaddr > 0) {
2108 /* When a new public address is created as described
2109 * in [ADDRCONF], also create a new temporary address.
2110 * Also create a temporary address if it's enabled but
2111 * no temporary address currently exists.
2113 read_unlock_bh(&idev->lock);
2114 ipv6_create_tempaddr(ifp, NULL);
2116 read_unlock_bh(&idev->lock);
2120 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2122 struct prefix_info *pinfo;
2126 struct inet6_dev *in6_dev;
2127 struct net *net = dev_net(dev);
2129 pinfo = (struct prefix_info *) opt;
2131 if (len < sizeof(struct prefix_info)) {
2132 ADBG("addrconf: prefix option too short\n");
2137 * Validation checks ([ADDRCONF], page 19)
2140 addr_type = ipv6_addr_type(&pinfo->prefix);
2142 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2145 valid_lft = ntohl(pinfo->valid);
2146 prefered_lft = ntohl(pinfo->prefered);
2148 if (prefered_lft > valid_lft) {
2149 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2153 in6_dev = in6_dev_get(dev);
2155 if (in6_dev == NULL) {
2156 net_dbg_ratelimited("addrconf: device %s not configured\n",
2162 * Two things going on here:
2163 * 1) Add routes for on-link prefixes
2164 * 2) Configure prefixes with the auto flag set
2167 if (pinfo->onlink) {
2168 struct rt6_info *rt;
2169 unsigned long rt_expires;
2171 /* Avoid arithmetic overflow. Really, we could
2172 * save rt_expires in seconds, likely valid_lft,
2173 * but it would require division in fib gc, that it
2177 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2179 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2181 if (addrconf_finite_timeout(rt_expires))
2184 rt = addrconf_get_prefix_route(&pinfo->prefix,
2187 RTF_ADDRCONF | RTF_PREFIX_RT,
2188 RTF_GATEWAY | RTF_DEFAULT);
2191 /* Autoconf prefix route */
2192 if (valid_lft == 0) {
2195 } else if (addrconf_finite_timeout(rt_expires)) {
2197 rt6_set_expires(rt, jiffies + rt_expires);
2199 rt6_clean_expires(rt);
2201 } else if (valid_lft) {
2202 clock_t expires = 0;
2203 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2204 if (addrconf_finite_timeout(rt_expires)) {
2206 flags |= RTF_EXPIRES;
2207 expires = jiffies_to_clock_t(rt_expires);
2209 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2210 dev, expires, flags);
2215 /* Try to figure out our local address for this prefix */
2217 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2218 struct inet6_ifaddr *ifp;
2219 struct in6_addr addr;
2220 int create = 0, update_lft = 0;
2221 bool tokenized = false;
2223 if (pinfo->prefix_len == 64) {
2224 memcpy(&addr, &pinfo->prefix, 8);
2226 if (!ipv6_addr_any(&in6_dev->token)) {
2227 read_lock_bh(&in6_dev->lock);
2228 memcpy(addr.s6_addr + 8,
2229 in6_dev->token.s6_addr + 8, 8);
2230 read_unlock_bh(&in6_dev->lock);
2232 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2233 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2234 in6_dev_put(in6_dev);
2239 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2241 in6_dev_put(in6_dev);
2246 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
2248 if (ifp == NULL && valid_lft) {
2249 int max_addresses = in6_dev->cnf.max_addresses;
2252 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2253 if (in6_dev->cnf.optimistic_dad &&
2254 !net->ipv6.devconf_all->forwarding && sllao)
2255 addr_flags = IFA_F_OPTIMISTIC;
2258 /* Do not allow to create too much of autoconfigured
2259 * addresses; this would be too easy way to crash kernel.
2261 if (!max_addresses ||
2262 ipv6_count_addresses(in6_dev) < max_addresses)
2263 ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2265 addr_type&IPV6_ADDR_SCOPE_MASK,
2266 addr_flags, valid_lft,
2269 if (IS_ERR_OR_NULL(ifp)) {
2270 in6_dev_put(in6_dev);
2274 ifp->flags |= IFA_F_MANAGETEMPADDR;
2277 ifp->cstamp = jiffies;
2278 ifp->tokenized = tokenized;
2279 addrconf_dad_start(ifp);
2287 /* update lifetime (RFC2462 5.5.3 e) */
2288 spin_lock(&ifp->lock);
2290 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2291 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2294 if (!update_lft && !create && stored_lft) {
2295 const u32 minimum_lft = min(
2296 stored_lft, (u32)MIN_VALID_LIFETIME);
2297 valid_lft = max(valid_lft, minimum_lft);
2299 /* RFC4862 Section 5.5.3e:
2300 * "Note that the preferred lifetime of the
2301 * corresponding address is always reset to
2302 * the Preferred Lifetime in the received
2303 * Prefix Information option, regardless of
2304 * whether the valid lifetime is also reset or
2307 * So we should always update prefered_lft here.
2313 ifp->valid_lft = valid_lft;
2314 ifp->prefered_lft = prefered_lft;
2317 ifp->flags &= ~IFA_F_DEPRECATED;
2318 spin_unlock(&ifp->lock);
2320 if (!(flags&IFA_F_TENTATIVE))
2321 ipv6_ifa_notify(0, ifp);
2323 spin_unlock(&ifp->lock);
2325 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2332 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2333 in6_dev_put(in6_dev);
2337 * Set destination address.
2338 * Special case for SIT interfaces where we create a new "virtual"
2341 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2343 struct in6_ifreq ireq;
2344 struct net_device *dev;
2350 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2353 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2359 #if IS_ENABLED(CONFIG_IPV6_SIT)
2360 if (dev->type == ARPHRD_SIT) {
2361 const struct net_device_ops *ops = dev->netdev_ops;
2363 struct ip_tunnel_parm p;
2365 err = -EADDRNOTAVAIL;
2366 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2369 memset(&p, 0, sizeof(p));
2370 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2374 p.iph.protocol = IPPROTO_IPV6;
2376 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2378 if (ops->ndo_do_ioctl) {
2379 mm_segment_t oldfs = get_fs();
2382 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2389 dev = __dev_get_by_name(net, p.name);
2392 err = dev_open(dev);
2403 * Manual configuration of address on an interface
2405 static int inet6_addr_add(struct net *net, int ifindex,
2406 const struct in6_addr *pfx,
2407 const struct in6_addr *peer_pfx,
2408 unsigned int plen, __u32 ifa_flags,
2409 __u32 prefered_lft, __u32 valid_lft)
2411 struct inet6_ifaddr *ifp;
2412 struct inet6_dev *idev;
2413 struct net_device *dev;
2417 unsigned long timeout;
2424 /* check the lifetime */
2425 if (!valid_lft || prefered_lft > valid_lft)
2428 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2431 dev = __dev_get_by_index(net, ifindex);
2435 idev = addrconf_add_dev(dev);
2437 return PTR_ERR(idev);
2439 scope = ipv6_addr_scope(pfx);
2441 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2442 if (addrconf_finite_timeout(timeout)) {
2443 expires = jiffies_to_clock_t(timeout * HZ);
2444 valid_lft = timeout;
2445 flags = RTF_EXPIRES;
2449 ifa_flags |= IFA_F_PERMANENT;
2452 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2453 if (addrconf_finite_timeout(timeout)) {
2455 ifa_flags |= IFA_F_DEPRECATED;
2456 prefered_lft = timeout;
2459 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2460 valid_lft, prefered_lft);
2463 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2464 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2469 * Note that section 3.1 of RFC 4429 indicates
2470 * that the Optimistic flag should not be set for
2471 * manually configured addresses
2473 addrconf_dad_start(ifp);
2474 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2475 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2482 return PTR_ERR(ifp);
2485 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
2488 struct inet6_ifaddr *ifp;
2489 struct inet6_dev *idev;
2490 struct net_device *dev;
2495 dev = __dev_get_by_index(net, ifindex);
2499 if ((idev = __in6_dev_get(dev)) == NULL)
2502 read_lock_bh(&idev->lock);
2503 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2504 if (ifp->prefix_len == plen &&
2505 ipv6_addr_equal(pfx, &ifp->addr)) {
2507 read_unlock_bh(&idev->lock);
2513 read_unlock_bh(&idev->lock);
2514 return -EADDRNOTAVAIL;
2518 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2520 struct in6_ifreq ireq;
2523 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2526 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2530 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2531 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2532 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2537 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2539 struct in6_ifreq ireq;
2542 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2545 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2549 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2550 ireq.ifr6_prefixlen);
2555 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2556 int plen, int scope)
2558 struct inet6_ifaddr *ifp;
2560 ifp = ipv6_add_addr(idev, addr, NULL, plen,
2561 scope, IFA_F_PERMANENT,
2562 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2564 spin_lock_bh(&ifp->lock);
2565 ifp->flags &= ~IFA_F_TENTATIVE;
2566 spin_unlock_bh(&ifp->lock);
2567 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2572 #if IS_ENABLED(CONFIG_IPV6_SIT)
2573 static void sit_add_v4_addrs(struct inet6_dev *idev)
2575 struct in6_addr addr;
2576 struct net_device *dev;
2577 struct net *net = dev_net(idev->dev);
2583 memset(&addr, 0, sizeof(struct in6_addr));
2584 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2586 if (idev->dev->flags&IFF_POINTOPOINT) {
2587 addr.s6_addr32[0] = htonl(0xfe800000);
2591 scope = IPV6_ADDR_COMPATv4;
2593 pflags |= RTF_NONEXTHOP;
2596 if (addr.s6_addr32[3]) {
2597 add_addr(idev, &addr, plen, scope);
2598 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
2602 for_each_netdev(net, dev) {
2603 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2604 if (in_dev && (dev->flags & IFF_UP)) {
2605 struct in_ifaddr *ifa;
2609 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)
2621 add_addr(idev, &addr, plen, flag);
2622 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2630 static void init_loopback(struct net_device *dev)
2632 struct inet6_dev *idev;
2633 struct net_device *sp_dev;
2634 struct inet6_ifaddr *sp_ifa;
2635 struct rt6_info *sp_rt;
2641 if ((idev = ipv6_find_idev(dev)) == NULL) {
2642 pr_debug("%s: add_dev failed\n", __func__);
2646 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2648 /* Add routes to other interface's IPv6 addresses */
2649 for_each_netdev(dev_net(dev), sp_dev) {
2650 if (!strcmp(sp_dev->name, dev->name))
2653 idev = __in6_dev_get(sp_dev);
2657 read_lock_bh(&idev->lock);
2658 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2660 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2664 /* This dst has been added to garbage list when
2665 * lo device down, release this obsolete dst and
2666 * reallocate a new router for ifa.
2668 if (sp_ifa->rt->dst.obsolete > 0) {
2669 ip6_rt_put(sp_ifa->rt);
2676 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
2678 /* Failure cases are ignored */
2679 if (!IS_ERR(sp_rt)) {
2684 read_unlock_bh(&idev->lock);
2688 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
2690 struct inet6_ifaddr *ifp;
2691 u32 addr_flags = IFA_F_PERMANENT;
2693 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2694 if (idev->cnf.optimistic_dad &&
2695 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2696 addr_flags |= IFA_F_OPTIMISTIC;
2700 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
2701 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2703 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2704 addrconf_dad_start(ifp);
2709 static void addrconf_dev_config(struct net_device *dev)
2711 struct in6_addr addr;
2712 struct inet6_dev *idev;
2716 if ((dev->type != ARPHRD_ETHER) &&
2717 (dev->type != ARPHRD_FDDI) &&
2718 (dev->type != ARPHRD_ARCNET) &&
2719 (dev->type != ARPHRD_INFINIBAND) &&
2720 (dev->type != ARPHRD_IEEE802154) &&
2721 (dev->type != ARPHRD_IEEE1394) &&
2722 (dev->type != ARPHRD_TUNNEL6) &&
2723 (dev->type != ARPHRD_6LOWPAN)) {
2724 /* Alas, we support only Ethernet autoconfiguration. */
2728 idev = addrconf_add_dev(dev);
2732 memset(&addr, 0, sizeof(struct in6_addr));
2733 addr.s6_addr32[0] = htonl(0xFE800000);
2735 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2736 addrconf_add_linklocal(idev, &addr);
2739 #if IS_ENABLED(CONFIG_IPV6_SIT)
2740 static void addrconf_sit_config(struct net_device *dev)
2742 struct inet6_dev *idev;
2747 * Configure the tunnel with one of our IPv4
2748 * addresses... we should configure all of
2749 * our v4 addrs in the tunnel
2752 if ((idev = ipv6_find_idev(dev)) == NULL) {
2753 pr_debug("%s: add_dev failed\n", __func__);
2757 if (dev->priv_flags & IFF_ISATAP) {
2758 struct in6_addr addr;
2760 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2761 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2762 addrconf_add_linklocal(idev, &addr);
2766 sit_add_v4_addrs(idev);
2768 if (dev->flags&IFF_POINTOPOINT)
2769 addrconf_add_mroute(dev);
2773 #if IS_ENABLED(CONFIG_NET_IPGRE)
2774 static void addrconf_gre_config(struct net_device *dev)
2776 struct inet6_dev *idev;
2777 struct in6_addr addr;
2781 if ((idev = ipv6_find_idev(dev)) == NULL) {
2782 pr_debug("%s: add_dev failed\n", __func__);
2786 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2787 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2788 addrconf_add_linklocal(idev, &addr);
2790 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2795 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2797 struct in6_addr lladdr;
2799 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2800 addrconf_add_linklocal(idev, &lladdr);
2806 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2809 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2810 struct inet6_dev *idev = __in6_dev_get(dev);
2811 int run_pending = 0;
2815 case NETDEV_REGISTER:
2816 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2817 idev = ipv6_add_dev(dev);
2819 return notifier_from_errno(-ENOMEM);
2825 if (dev->flags & IFF_SLAVE)
2828 if (event == NETDEV_UP) {
2829 if (!addrconf_qdisc_ok(dev)) {
2830 /* device is not ready yet. */
2831 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
2836 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2837 idev = ipv6_add_dev(dev);
2840 idev->if_flags |= IF_READY;
2844 if (!addrconf_qdisc_ok(dev)) {
2845 /* device is still not ready. */
2850 if (idev->if_flags & IF_READY)
2851 /* device is already configured. */
2853 idev->if_flags |= IF_READY;
2856 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
2862 switch (dev->type) {
2863 #if IS_ENABLED(CONFIG_IPV6_SIT)
2865 addrconf_sit_config(dev);
2868 #if IS_ENABLED(CONFIG_NET_IPGRE)
2870 addrconf_gre_config(dev);
2873 case ARPHRD_LOOPBACK:
2878 addrconf_dev_config(dev);
2884 addrconf_dad_run(idev);
2887 * If the MTU changed during the interface down,
2888 * when the interface up, the changed MTU must be
2889 * reflected in the idev as well as routers.
2891 if (idev->cnf.mtu6 != dev->mtu &&
2892 dev->mtu >= IPV6_MIN_MTU) {
2893 rt6_mtu_change(dev, dev->mtu);
2894 idev->cnf.mtu6 = dev->mtu;
2896 idev->tstamp = jiffies;
2897 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2900 * If the changed mtu during down is lower than
2901 * IPV6_MIN_MTU stop IPv6 on this interface.
2903 if (dev->mtu < IPV6_MIN_MTU)
2904 addrconf_ifdown(dev, 1);
2908 case NETDEV_CHANGEMTU:
2909 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2910 rt6_mtu_change(dev, dev->mtu);
2911 idev->cnf.mtu6 = dev->mtu;
2915 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2916 idev = ipv6_add_dev(dev);
2922 * if MTU under IPV6_MIN_MTU.
2923 * Stop IPv6 on this interface.
2927 case NETDEV_UNREGISTER:
2929 * Remove all addresses from this interface.
2931 addrconf_ifdown(dev, event != NETDEV_DOWN);
2934 case NETDEV_CHANGENAME:
2936 snmp6_unregister_dev(idev);
2937 addrconf_sysctl_unregister(idev);
2938 addrconf_sysctl_register(idev);
2939 err = snmp6_register_dev(idev);
2941 return notifier_from_errno(err);
2945 case NETDEV_PRE_TYPE_CHANGE:
2946 case NETDEV_POST_TYPE_CHANGE:
2947 addrconf_type_change(dev, event);
2955 * addrconf module should be notified of a device going up
2957 static struct notifier_block ipv6_dev_notf = {
2958 .notifier_call = addrconf_notify,
2961 static void addrconf_type_change(struct net_device *dev, unsigned long event)
2963 struct inet6_dev *idev;
2966 idev = __in6_dev_get(dev);
2968 if (event == NETDEV_POST_TYPE_CHANGE)
2969 ipv6_mc_remap(idev);
2970 else if (event == NETDEV_PRE_TYPE_CHANGE)
2971 ipv6_mc_unmap(idev);
2974 static int addrconf_ifdown(struct net_device *dev, int how)
2976 struct net *net = dev_net(dev);
2977 struct inet6_dev *idev;
2978 struct inet6_ifaddr *ifa;
2983 rt6_ifdown(net, dev);
2984 neigh_ifdown(&nd_tbl, dev);
2986 idev = __in6_dev_get(dev);
2991 * Step 1: remove reference to ipv6 device from parent device.
2997 /* protected by rtnl_lock */
2998 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3000 /* Step 1.5: remove snmp6 entry */
3001 snmp6_unregister_dev(idev);
3005 /* Step 2: clear hash table */
3006 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3007 struct hlist_head *h = &inet6_addr_lst[i];
3009 spin_lock_bh(&addrconf_hash_lock);
3011 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3012 if (ifa->idev == idev) {
3013 hlist_del_init_rcu(&ifa->addr_lst);
3014 addrconf_del_dad_timer(ifa);
3018 spin_unlock_bh(&addrconf_hash_lock);
3021 write_lock_bh(&idev->lock);
3023 addrconf_del_rs_timer(idev);
3025 /* Step 2: clear flags for stateless addrconf */
3027 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3029 if (how && del_timer(&idev->regen_timer))
3032 /* Step 3: clear tempaddr list */
3033 while (!list_empty(&idev->tempaddr_list)) {
3034 ifa = list_first_entry(&idev->tempaddr_list,
3035 struct inet6_ifaddr, tmp_list);
3036 list_del(&ifa->tmp_list);
3037 write_unlock_bh(&idev->lock);
3038 spin_lock_bh(&ifa->lock);
3041 in6_ifa_put(ifa->ifpub);
3044 spin_unlock_bh(&ifa->lock);
3046 write_lock_bh(&idev->lock);
3049 while (!list_empty(&idev->addr_list)) {
3050 ifa = list_first_entry(&idev->addr_list,
3051 struct inet6_ifaddr, if_list);
3052 addrconf_del_dad_timer(ifa);
3054 list_del(&ifa->if_list);
3056 write_unlock_bh(&idev->lock);
3058 spin_lock_bh(&ifa->state_lock);
3060 ifa->state = INET6_IFADDR_STATE_DEAD;
3061 spin_unlock_bh(&ifa->state_lock);
3063 if (state != INET6_IFADDR_STATE_DEAD) {
3064 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3065 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3069 write_lock_bh(&idev->lock);
3072 write_unlock_bh(&idev->lock);
3074 /* Step 5: Discard multicast list */
3076 ipv6_mc_destroy_dev(idev);
3080 idev->tstamp = jiffies;
3082 /* Last: Shot the device (if unregistered) */
3084 addrconf_sysctl_unregister(idev);
3085 neigh_parms_release(&nd_tbl, idev->nd_parms);
3086 neigh_ifdown(&nd_tbl, dev);
3092 static void addrconf_rs_timer(unsigned long data)
3094 struct inet6_dev *idev = (struct inet6_dev *)data;
3095 struct net_device *dev = idev->dev;
3096 struct in6_addr lladdr;
3098 write_lock(&idev->lock);
3099 if (idev->dead || !(idev->if_flags & IF_READY))
3102 if (!ipv6_accept_ra(idev))
3105 /* Announcement received after solicitation was sent */
3106 if (idev->if_flags & IF_RA_RCVD)
3109 if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
3110 write_unlock(&idev->lock);
3111 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3112 ndisc_send_rs(dev, &lladdr,
3113 &in6addr_linklocal_allrouters);
3117 write_lock(&idev->lock);
3118 /* The wait after the last probe can be shorter */
3119 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3120 idev->cnf.rtr_solicits) ?
3121 idev->cnf.rtr_solicit_delay :
3122 idev->cnf.rtr_solicit_interval);
3125 * Note: we do not support deprecated "all on-link"
3126 * assumption any longer.
3128 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3132 write_unlock(&idev->lock);
3138 * Duplicate Address Detection
3140 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3142 unsigned long rand_num;
3143 struct inet6_dev *idev = ifp->idev;
3145 if (ifp->flags & IFA_F_OPTIMISTIC)
3148 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3150 ifp->dad_probes = idev->cnf.dad_transmits;
3151 addrconf_mod_dad_timer(ifp, rand_num);
3154 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3156 struct inet6_dev *idev = ifp->idev;
3157 struct net_device *dev = idev->dev;
3159 addrconf_join_solict(dev, &ifp->addr);
3161 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3163 read_lock_bh(&idev->lock);
3164 spin_lock(&ifp->lock);
3165 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3168 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3169 idev->cnf.accept_dad < 1 ||
3170 !(ifp->flags&IFA_F_TENTATIVE) ||
3171 ifp->flags & IFA_F_NODAD) {
3172 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3173 spin_unlock(&ifp->lock);
3174 read_unlock_bh(&idev->lock);
3176 addrconf_dad_completed(ifp);
3180 if (!(idev->if_flags & IF_READY)) {
3181 spin_unlock(&ifp->lock);
3182 read_unlock_bh(&idev->lock);
3184 * If the device is not ready:
3185 * - keep it tentative if it is a permanent address.
3186 * - otherwise, kill it.
3189 addrconf_dad_stop(ifp, 0);
3194 * Optimistic nodes can start receiving
3197 if (ifp->flags & IFA_F_OPTIMISTIC)
3198 ip6_ins_rt(ifp->rt);
3200 addrconf_dad_kick(ifp);
3202 spin_unlock(&ifp->lock);
3203 read_unlock_bh(&idev->lock);
3206 static void addrconf_dad_timer(unsigned long data)
3208 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
3209 struct inet6_dev *idev = ifp->idev;
3210 struct in6_addr mcaddr;
3212 if (!ifp->dad_probes && addrconf_dad_end(ifp))
3215 write_lock(&idev->lock);
3216 if (idev->dead || !(idev->if_flags & IF_READY)) {
3217 write_unlock(&idev->lock);
3221 spin_lock(&ifp->lock);
3222 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3223 spin_unlock(&ifp->lock);
3224 write_unlock(&idev->lock);
3228 if (ifp->dad_probes == 0) {
3230 * DAD was successful
3233 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3234 spin_unlock(&ifp->lock);
3235 write_unlock(&idev->lock);
3237 addrconf_dad_completed(ifp);
3243 addrconf_mod_dad_timer(ifp,
3244 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
3245 spin_unlock(&ifp->lock);
3246 write_unlock(&idev->lock);
3248 /* send a neighbour solicitation for our addr */
3249 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3250 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
3255 /* ifp->idev must be at least read locked */
3256 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3258 struct inet6_ifaddr *ifpiter;
3259 struct inet6_dev *idev = ifp->idev;
3261 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3262 if (ifpiter->scope > IFA_LINK)
3264 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3265 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3266 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3273 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3275 struct net_device *dev = ifp->idev->dev;
3276 struct in6_addr lladdr;
3277 bool send_rs, send_mld;
3279 addrconf_del_dad_timer(ifp);
3282 * Configure the address for reception. Now it is valid.
3285 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3287 /* If added prefix is link local and we are prepared to process
3288 router advertisements, start sending router solicitations.
3291 read_lock_bh(&ifp->idev->lock);
3292 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
3293 send_rs = send_mld &&
3294 ipv6_accept_ra(ifp->idev) &&
3295 ifp->idev->cnf.rtr_solicits > 0 &&
3296 (dev->flags&IFF_LOOPBACK) == 0;
3297 read_unlock_bh(&ifp->idev->lock);
3299 /* While dad is in progress mld report's source address is in6_addrany.
3300 * Resend with proper ll now.
3303 ipv6_mc_dad_complete(ifp->idev);
3307 * If a host as already performed a random delay
3308 * [...] as part of DAD [...] there is no need
3309 * to delay again before sending the first RS
3311 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3313 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
3315 write_lock_bh(&ifp->idev->lock);
3316 spin_lock(&ifp->lock);
3317 ifp->idev->rs_probes = 1;
3318 ifp->idev->if_flags |= IF_RS_SENT;
3319 addrconf_mod_rs_timer(ifp->idev,
3320 ifp->idev->cnf.rtr_solicit_interval);
3321 spin_unlock(&ifp->lock);
3322 write_unlock_bh(&ifp->idev->lock);
3326 static void addrconf_dad_run(struct inet6_dev *idev)
3328 struct inet6_ifaddr *ifp;
3330 read_lock_bh(&idev->lock);
3331 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3332 spin_lock(&ifp->lock);
3333 if (ifp->flags & IFA_F_TENTATIVE &&
3334 ifp->state == INET6_IFADDR_STATE_DAD)
3335 addrconf_dad_kick(ifp);
3336 spin_unlock(&ifp->lock);
3338 read_unlock_bh(&idev->lock);
3341 #ifdef CONFIG_PROC_FS
3342 struct if6_iter_state {
3343 struct seq_net_private p;
3348 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3350 struct inet6_ifaddr *ifa = NULL;
3351 struct if6_iter_state *state = seq->private;
3352 struct net *net = seq_file_net(seq);
3355 /* initial bucket if pos is 0 */
3361 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3362 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
3364 if (!net_eq(dev_net(ifa->idev->dev), net))
3366 /* sync with offset */
3367 if (p < state->offset) {
3375 /* prepare for next bucket */
3382 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3383 struct inet6_ifaddr *ifa)
3385 struct if6_iter_state *state = seq->private;
3386 struct net *net = seq_file_net(seq);
3388 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
3389 if (!net_eq(dev_net(ifa->idev->dev), net))
3395 while (++state->bucket < IN6_ADDR_HSIZE) {
3397 hlist_for_each_entry_rcu_bh(ifa,
3398 &inet6_addr_lst[state->bucket], addr_lst) {
3399 if (!net_eq(dev_net(ifa->idev->dev), net))
3409 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3413 return if6_get_first(seq, *pos);
3416 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3418 struct inet6_ifaddr *ifa;
3420 ifa = if6_get_next(seq, v);
3425 static void if6_seq_stop(struct seq_file *seq, void *v)
3428 rcu_read_unlock_bh();
3431 static int if6_seq_show(struct seq_file *seq, void *v)
3433 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3434 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3436 ifp->idev->dev->ifindex,
3440 ifp->idev->dev->name);
3444 static const struct seq_operations if6_seq_ops = {
3445 .start = if6_seq_start,
3446 .next = if6_seq_next,
3447 .show = if6_seq_show,
3448 .stop = if6_seq_stop,
3451 static int if6_seq_open(struct inode *inode, struct file *file)
3453 return seq_open_net(inode, file, &if6_seq_ops,
3454 sizeof(struct if6_iter_state));
3457 static const struct file_operations if6_fops = {
3458 .owner = THIS_MODULE,
3459 .open = if6_seq_open,
3461 .llseek = seq_lseek,
3462 .release = seq_release_net,
3465 static int __net_init if6_proc_net_init(struct net *net)
3467 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
3472 static void __net_exit if6_proc_net_exit(struct net *net)
3474 remove_proc_entry("if_inet6", net->proc_net);
3477 static struct pernet_operations if6_proc_net_ops = {
3478 .init = if6_proc_net_init,
3479 .exit = if6_proc_net_exit,
3482 int __init if6_proc_init(void)
3484 return register_pernet_subsys(&if6_proc_net_ops);
3487 void if6_proc_exit(void)
3489 unregister_pernet_subsys(&if6_proc_net_ops);
3491 #endif /* CONFIG_PROC_FS */
3493 #if IS_ENABLED(CONFIG_IPV6_MIP6)
3494 /* Check if address is a home address configured on any interface. */
3495 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3498 struct inet6_ifaddr *ifp = NULL;
3499 unsigned int hash = inet6_addr_hash(addr);
3502 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
3503 if (!net_eq(dev_net(ifp->idev->dev), net))
3505 if (ipv6_addr_equal(&ifp->addr, addr) &&
3506 (ifp->flags & IFA_F_HOMEADDRESS)) {
3511 rcu_read_unlock_bh();
3517 * Periodic address status verification
3520 static void addrconf_verify(unsigned long foo)
3522 unsigned long now, next, next_sec, next_sched;
3523 struct inet6_ifaddr *ifp;
3527 spin_lock(&addrconf_verify_lock);
3529 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3531 del_timer(&addr_chk_timer);
3533 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3535 hlist_for_each_entry_rcu_bh(ifp,
3536 &inet6_addr_lst[i], addr_lst) {
3539 /* When setting preferred_lft to a value not zero or
3540 * infinity, while valid_lft is infinity
3541 * IFA_F_PERMANENT has a non-infinity life time.
3543 if ((ifp->flags & IFA_F_PERMANENT) &&
3544 (ifp->prefered_lft == INFINITY_LIFE_TIME))
3547 spin_lock(&ifp->lock);
3548 /* We try to batch several events at once. */
3549 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3551 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3552 age >= ifp->valid_lft) {
3553 spin_unlock(&ifp->lock);
3557 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3558 spin_unlock(&ifp->lock);
3560 } else if (age >= ifp->prefered_lft) {
3561 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3564 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3566 ifp->flags |= IFA_F_DEPRECATED;
3569 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
3570 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
3571 next = ifp->tstamp + ifp->valid_lft * HZ;
3573 spin_unlock(&ifp->lock);
3578 ipv6_ifa_notify(0, ifp);
3582 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3583 !(ifp->flags&IFA_F_TENTATIVE)) {
3584 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3585 ifp->idev->cnf.dad_transmits *
3586 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
3588 if (age >= ifp->prefered_lft - regen_advance) {
3589 struct inet6_ifaddr *ifpub = ifp->ifpub;
3590 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3591 next = ifp->tstamp + ifp->prefered_lft * HZ;
3592 if (!ifp->regen_count && ifpub) {
3595 in6_ifa_hold(ifpub);
3596 spin_unlock(&ifp->lock);
3598 spin_lock(&ifpub->lock);
3599 ifpub->regen_count = 0;
3600 spin_unlock(&ifpub->lock);
3601 ipv6_create_tempaddr(ifpub, ifp);
3606 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3607 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3608 spin_unlock(&ifp->lock);
3610 /* ifp->prefered_lft <= ifp->valid_lft */
3611 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3612 next = ifp->tstamp + ifp->prefered_lft * HZ;
3613 spin_unlock(&ifp->lock);
3618 next_sec = round_jiffies_up(next);
3621 /* If rounded timeout is accurate enough, accept it. */
3622 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3623 next_sched = next_sec;
3625 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3626 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3627 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3629 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3630 now, next, next_sec, next_sched);
3632 addr_chk_timer.expires = next_sched;
3633 add_timer(&addr_chk_timer);
3634 spin_unlock(&addrconf_verify_lock);
3635 rcu_read_unlock_bh();
3638 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
3639 struct in6_addr **peer_pfx)
3641 struct in6_addr *pfx = NULL;
3646 pfx = nla_data(addr);
3649 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3651 pfx = nla_data(local);
3657 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3658 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3659 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3660 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3661 [IFA_FLAGS] = { .len = sizeof(u32) },
3665 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
3667 struct net *net = sock_net(skb->sk);
3668 struct ifaddrmsg *ifm;
3669 struct nlattr *tb[IFA_MAX+1];
3670 struct in6_addr *pfx, *peer_pfx;
3673 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3677 ifm = nlmsg_data(nlh);
3678 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
3682 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3685 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
3686 u32 prefered_lft, u32 valid_lft)
3690 unsigned long timeout;
3691 bool was_managetempaddr;
3692 bool had_prefixroute;
3694 if (!valid_lft || (prefered_lft > valid_lft))
3697 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
3698 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
3701 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3702 if (addrconf_finite_timeout(timeout)) {
3703 expires = jiffies_to_clock_t(timeout * HZ);
3704 valid_lft = timeout;
3705 flags = RTF_EXPIRES;
3709 ifa_flags |= IFA_F_PERMANENT;
3712 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3713 if (addrconf_finite_timeout(timeout)) {
3715 ifa_flags |= IFA_F_DEPRECATED;
3716 prefered_lft = timeout;
3719 spin_lock_bh(&ifp->lock);
3720 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
3721 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
3722 !(ifp->flags & IFA_F_NOPREFIXROUTE);
3723 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
3724 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
3725 IFA_F_NOPREFIXROUTE);
3726 ifp->flags |= ifa_flags;
3727 ifp->tstamp = jiffies;
3728 ifp->valid_lft = valid_lft;
3729 ifp->prefered_lft = prefered_lft;
3731 spin_unlock_bh(&ifp->lock);
3732 if (!(ifp->flags&IFA_F_TENTATIVE))
3733 ipv6_ifa_notify(0, ifp);
3735 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
3736 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3738 } else if (had_prefixroute) {
3739 enum cleanup_prefix_rt_t action;
3740 unsigned long rt_expires;
3742 write_lock_bh(&ifp->idev->lock);
3743 action = check_cleanup_prefix_route(ifp, &rt_expires);
3744 write_unlock_bh(&ifp->idev->lock);
3746 if (action != CLEANUP_PREFIX_RT_NOP) {
3747 cleanup_prefix_route(ifp, rt_expires,
3748 action == CLEANUP_PREFIX_RT_DEL);
3752 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
3753 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
3754 valid_lft = prefered_lft = 0;
3755 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
3756 !was_managetempaddr, jiffies);
3765 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
3767 struct net *net = sock_net(skb->sk);
3768 struct ifaddrmsg *ifm;
3769 struct nlattr *tb[IFA_MAX+1];
3770 struct in6_addr *pfx, *peer_pfx;
3771 struct inet6_ifaddr *ifa;
3772 struct net_device *dev;
3773 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3777 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3781 ifm = nlmsg_data(nlh);
3782 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
3786 if (tb[IFA_CACHEINFO]) {
3787 struct ifa_cacheinfo *ci;
3789 ci = nla_data(tb[IFA_CACHEINFO]);
3790 valid_lft = ci->ifa_valid;
3791 preferred_lft = ci->ifa_prefered;
3793 preferred_lft = INFINITY_LIFE_TIME;
3794 valid_lft = INFINITY_LIFE_TIME;
3797 dev = __dev_get_by_index(net, ifm->ifa_index);
3801 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
3803 /* We ignore other flags so far. */
3804 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
3805 IFA_F_NOPREFIXROUTE;
3807 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3810 * It would be best to check for !NLM_F_CREATE here but
3811 * userspace already relies on not having to provide this.
3813 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
3814 ifm->ifa_prefixlen, ifa_flags,
3815 preferred_lft, valid_lft);
3818 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3819 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3822 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3829 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
3830 u8 scope, int ifindex)
3832 struct ifaddrmsg *ifm;
3834 ifm = nlmsg_data(nlh);
3835 ifm->ifa_family = AF_INET6;
3836 ifm->ifa_prefixlen = prefixlen;
3837 ifm->ifa_flags = flags;
3838 ifm->ifa_scope = scope;
3839 ifm->ifa_index = ifindex;
3842 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3843 unsigned long tstamp, u32 preferred, u32 valid)
3845 struct ifa_cacheinfo ci;
3847 ci.cstamp = cstamp_delta(cstamp);
3848 ci.tstamp = cstamp_delta(tstamp);
3849 ci.ifa_prefered = preferred;
3850 ci.ifa_valid = valid;
3852 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3855 static inline int rt_scope(int ifa_scope)
3857 if (ifa_scope & IFA_HOST)
3858 return RT_SCOPE_HOST;
3859 else if (ifa_scope & IFA_LINK)
3860 return RT_SCOPE_LINK;
3861 else if (ifa_scope & IFA_SITE)
3862 return RT_SCOPE_SITE;
3864 return RT_SCOPE_UNIVERSE;
3867 static inline int inet6_ifaddr_msgsize(void)
3869 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3870 + nla_total_size(16) /* IFA_LOCAL */
3871 + nla_total_size(16) /* IFA_ADDRESS */
3872 + nla_total_size(sizeof(struct ifa_cacheinfo))
3873 + nla_total_size(4) /* IFA_FLAGS */;
3876 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3877 u32 portid, u32 seq, int event, unsigned int flags)
3879 struct nlmsghdr *nlh;
3880 u32 preferred, valid;
3882 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3886 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3887 ifa->idev->dev->ifindex);
3889 if (!((ifa->flags&IFA_F_PERMANENT) &&
3890 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
3891 preferred = ifa->prefered_lft;
3892 valid = ifa->valid_lft;
3893 if (preferred != INFINITY_LIFE_TIME) {
3894 long tval = (jiffies - ifa->tstamp)/HZ;
3895 if (preferred > tval)
3899 if (valid != INFINITY_LIFE_TIME) {
3907 preferred = INFINITY_LIFE_TIME;
3908 valid = INFINITY_LIFE_TIME;
3911 if (!ipv6_addr_any(&ifa->peer_addr)) {
3912 if (nla_put(skb, IFA_LOCAL, 16, &ifa->addr) < 0 ||
3913 nla_put(skb, IFA_ADDRESS, 16, &ifa->peer_addr) < 0)
3916 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0)
3919 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
3922 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
3925 return nlmsg_end(skb, nlh);
3928 nlmsg_cancel(skb, nlh);
3932 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3933 u32 portid, u32 seq, int event, u16 flags)
3935 struct nlmsghdr *nlh;
3936 u8 scope = RT_SCOPE_UNIVERSE;
3937 int ifindex = ifmca->idev->dev->ifindex;
3939 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3940 scope = RT_SCOPE_SITE;
3942 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3946 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3947 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3948 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3949 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3950 nlmsg_cancel(skb, nlh);
3954 return nlmsg_end(skb, nlh);
3957 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3958 u32 portid, u32 seq, int event, unsigned int flags)
3960 struct nlmsghdr *nlh;
3961 u8 scope = RT_SCOPE_UNIVERSE;
3962 int ifindex = ifaca->aca_idev->dev->ifindex;
3964 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3965 scope = RT_SCOPE_SITE;
3967 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3971 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3972 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3973 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3974 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3975 nlmsg_cancel(skb, nlh);
3979 return nlmsg_end(skb, nlh);
3988 /* called with rcu_read_lock() */
3989 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3990 struct netlink_callback *cb, enum addr_type_t type,
3991 int s_ip_idx, int *p_ip_idx)
3993 struct ifmcaddr6 *ifmca;
3994 struct ifacaddr6 *ifaca;
3996 int ip_idx = *p_ip_idx;
3998 read_lock_bh(&idev->lock);
4000 case UNICAST_ADDR: {
4001 struct inet6_ifaddr *ifa;
4003 /* unicast address incl. temp addr */
4004 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4005 if (++ip_idx < s_ip_idx)
4007 err = inet6_fill_ifaddr(skb, ifa,
4008 NETLINK_CB(cb->skb).portid,
4014 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4018 case MULTICAST_ADDR:
4019 /* multicast address */
4020 for (ifmca = idev->mc_list; ifmca;
4021 ifmca = ifmca->next, ip_idx++) {
4022 if (ip_idx < s_ip_idx)
4024 err = inet6_fill_ifmcaddr(skb, ifmca,
4025 NETLINK_CB(cb->skb).portid,
4034 /* anycast address */
4035 for (ifaca = idev->ac_list; ifaca;
4036 ifaca = ifaca->aca_next, ip_idx++) {
4037 if (ip_idx < s_ip_idx)
4039 err = inet6_fill_ifacaddr(skb, ifaca,
4040 NETLINK_CB(cb->skb).portid,
4051 read_unlock_bh(&idev->lock);
4056 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4057 enum addr_type_t type)
4059 struct net *net = sock_net(skb->sk);
4062 int s_idx, s_ip_idx;
4063 struct net_device *dev;
4064 struct inet6_dev *idev;
4065 struct hlist_head *head;
4068 s_idx = idx = cb->args[1];
4069 s_ip_idx = ip_idx = cb->args[2];
4072 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4073 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4075 head = &net->dev_index_head[h];
4076 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4079 if (h > s_h || idx > s_idx)
4082 idev = __in6_dev_get(dev);
4086 if (in6_dump_addrs(idev, skb, cb, type,
4087 s_ip_idx, &ip_idx) <= 0)
4097 cb->args[2] = ip_idx;
4102 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4104 enum addr_type_t type = UNICAST_ADDR;
4106 return inet6_dump_addr(skb, cb, type);
4109 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4111 enum addr_type_t type = MULTICAST_ADDR;
4113 return inet6_dump_addr(skb, cb, type);
4117 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4119 enum addr_type_t type = ANYCAST_ADDR;
4121 return inet6_dump_addr(skb, cb, type);
4124 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
4126 struct net *net = sock_net(in_skb->sk);
4127 struct ifaddrmsg *ifm;
4128 struct nlattr *tb[IFA_MAX+1];
4129 struct in6_addr *addr = NULL, *peer;
4130 struct net_device *dev = NULL;
4131 struct inet6_ifaddr *ifa;
4132 struct sk_buff *skb;
4135 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4139 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4145 ifm = nlmsg_data(nlh);
4147 dev = __dev_get_by_index(net, ifm->ifa_index);
4149 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4151 err = -EADDRNOTAVAIL;
4155 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4161 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4162 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4164 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4165 WARN_ON(err == -EMSGSIZE);
4169 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4176 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4178 struct sk_buff *skb;
4179 struct net *net = dev_net(ifa->idev->dev);
4182 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4186 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4188 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4189 WARN_ON(err == -EMSGSIZE);
4193 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4197 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4200 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4201 __s32 *array, int bytes)
4203 BUG_ON(bytes < (DEVCONF_MAX * 4));
4205 memset(array, 0, bytes);
4206 array[DEVCONF_FORWARDING] = cnf->forwarding;
4207 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4208 array[DEVCONF_MTU6] = cnf->mtu6;
4209 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4210 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4211 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4212 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4213 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4214 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4215 jiffies_to_msecs(cnf->rtr_solicit_interval);
4216 array[DEVCONF_RTR_SOLICIT_DELAY] =
4217 jiffies_to_msecs(cnf->rtr_solicit_delay);
4218 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4219 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4220 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4221 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4222 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
4223 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4224 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4225 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4226 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4227 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4228 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4229 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4230 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4231 #ifdef CONFIG_IPV6_ROUTER_PREF
4232 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4233 array[DEVCONF_RTR_PROBE_INTERVAL] =
4234 jiffies_to_msecs(cnf->rtr_probe_interval);
4235 #ifdef CONFIG_IPV6_ROUTE_INFO
4236 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4239 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4240 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4241 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4242 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4244 #ifdef CONFIG_IPV6_MROUTE
4245 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4247 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4248 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4249 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4250 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4251 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
4254 static inline size_t inet6_ifla6_size(void)
4256 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4257 + nla_total_size(sizeof(struct ifla_cacheinfo))
4258 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4259 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4260 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4261 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
4264 static inline size_t inet6_if_nlmsg_size(void)
4266 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4267 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4268 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4269 + nla_total_size(4) /* IFLA_MTU */
4270 + nla_total_size(4) /* IFLA_LINK */
4271 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4274 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4275 int items, int bytes)
4278 int pad = bytes - sizeof(u64) * items;
4281 /* Use put_unaligned() because stats may not be aligned for u64. */
4282 put_unaligned(items, &stats[0]);
4283 for (i = 1; i < items; i++)
4284 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4286 memset(&stats[items], 0, pad);
4289 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
4290 int items, int bytes, size_t syncpoff)
4293 int pad = bytes - sizeof(u64) * items;
4296 /* Use put_unaligned() because stats may not be aligned for u64. */
4297 put_unaligned(items, &stats[0]);
4298 for (i = 1; i < items; i++)
4299 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4301 memset(&stats[items], 0, pad);
4304 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4308 case IFLA_INET6_STATS:
4309 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
4310 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
4312 case IFLA_INET6_ICMP6STATS:
4313 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
4318 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4321 struct ifla_cacheinfo ci;
4323 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4324 goto nla_put_failure;
4325 ci.max_reasm_len = IPV6_MAXPLEN;
4326 ci.tstamp = cstamp_delta(idev->tstamp);
4327 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4328 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
4329 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4330 goto nla_put_failure;
4331 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4333 goto nla_put_failure;
4334 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4336 /* XXX - MC not implemented */
4338 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4340 goto nla_put_failure;
4341 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4343 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4345 goto nla_put_failure;
4346 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4348 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4350 goto nla_put_failure;
4351 read_lock_bh(&idev->lock);
4352 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4353 read_unlock_bh(&idev->lock);
4361 static size_t inet6_get_link_af_size(const struct net_device *dev)
4363 if (!__in6_dev_get(dev))
4366 return inet6_ifla6_size();
4369 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4371 struct inet6_dev *idev = __in6_dev_get(dev);
4376 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4382 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4384 struct inet6_ifaddr *ifp;
4385 struct net_device *dev = idev->dev;
4386 bool update_rs = false;
4387 struct in6_addr ll_addr;
4391 if (ipv6_addr_any(token))
4393 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4395 if (!ipv6_accept_ra(idev))
4397 if (idev->cnf.rtr_solicits <= 0)
4400 write_lock_bh(&idev->lock);
4402 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4403 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4405 write_unlock_bh(&idev->lock);
4407 if (!idev->dead && (idev->if_flags & IF_READY) &&
4408 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4409 IFA_F_OPTIMISTIC)) {
4411 /* If we're not ready, then normal ifup will take care
4412 * of this. Otherwise, we need to request our rs here.
4414 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4418 write_lock_bh(&idev->lock);
4421 idev->if_flags |= IF_RS_SENT;
4422 idev->rs_probes = 1;
4423 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
4426 /* Well, that's kinda nasty ... */
4427 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4428 spin_lock(&ifp->lock);
4429 if (ifp->tokenized) {
4431 ifp->prefered_lft = 0;
4433 spin_unlock(&ifp->lock);
4436 write_unlock_bh(&idev->lock);
4441 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4444 struct inet6_dev *idev = __in6_dev_get(dev);
4445 struct nlattr *tb[IFLA_INET6_MAX + 1];
4448 return -EAFNOSUPPORT;
4450 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4453 if (tb[IFLA_INET6_TOKEN])
4454 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
4459 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4460 u32 portid, u32 seq, int event, unsigned int flags)
4462 struct net_device *dev = idev->dev;
4463 struct ifinfomsg *hdr;
4464 struct nlmsghdr *nlh;
4467 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
4471 hdr = nlmsg_data(nlh);
4472 hdr->ifi_family = AF_INET6;
4474 hdr->ifi_type = dev->type;
4475 hdr->ifi_index = dev->ifindex;
4476 hdr->ifi_flags = dev_get_flags(dev);
4477 hdr->ifi_change = 0;
4479 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4481 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4482 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4483 (dev->ifindex != dev->iflink &&
4484 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4485 goto nla_put_failure;
4486 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4487 if (protoinfo == NULL)
4488 goto nla_put_failure;
4490 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4491 goto nla_put_failure;
4493 nla_nest_end(skb, protoinfo);
4494 return nlmsg_end(skb, nlh);
4497 nlmsg_cancel(skb, nlh);
4501 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4503 struct net *net = sock_net(skb->sk);
4506 struct net_device *dev;
4507 struct inet6_dev *idev;
4508 struct hlist_head *head;
4511 s_idx = cb->args[1];
4514 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4516 head = &net->dev_index_head[h];
4517 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4520 idev = __in6_dev_get(dev);
4523 if (inet6_fill_ifinfo(skb, idev,
4524 NETLINK_CB(cb->skb).portid,
4526 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4540 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4542 struct sk_buff *skb;
4543 struct net *net = dev_net(idev->dev);
4546 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4550 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4552 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4553 WARN_ON(err == -EMSGSIZE);
4557 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4561 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4564 static inline size_t inet6_prefix_nlmsg_size(void)
4566 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4567 + nla_total_size(sizeof(struct in6_addr))
4568 + nla_total_size(sizeof(struct prefix_cacheinfo));
4571 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4572 struct prefix_info *pinfo, u32 portid, u32 seq,
4573 int event, unsigned int flags)
4575 struct prefixmsg *pmsg;
4576 struct nlmsghdr *nlh;
4577 struct prefix_cacheinfo ci;
4579 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
4583 pmsg = nlmsg_data(nlh);
4584 pmsg->prefix_family = AF_INET6;
4585 pmsg->prefix_pad1 = 0;
4586 pmsg->prefix_pad2 = 0;
4587 pmsg->prefix_ifindex = idev->dev->ifindex;
4588 pmsg->prefix_len = pinfo->prefix_len;
4589 pmsg->prefix_type = pinfo->type;
4590 pmsg->prefix_pad3 = 0;
4591 pmsg->prefix_flags = 0;
4593 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4594 if (pinfo->autoconf)
4595 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4597 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4598 goto nla_put_failure;
4599 ci.preferred_time = ntohl(pinfo->prefered);
4600 ci.valid_time = ntohl(pinfo->valid);
4601 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4602 goto nla_put_failure;
4603 return nlmsg_end(skb, nlh);
4606 nlmsg_cancel(skb, nlh);
4610 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4611 struct prefix_info *pinfo)
4613 struct sk_buff *skb;
4614 struct net *net = dev_net(idev->dev);
4617 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4621 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4623 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4624 WARN_ON(err == -EMSGSIZE);
4628 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4632 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4635 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4637 struct net *net = dev_net(ifp->idev->dev);
4639 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4644 * If the address was optimistic
4645 * we inserted the route at the start of
4646 * our DAD process, so we don't need
4649 if (!(ifp->rt->rt6i_node))
4650 ip6_ins_rt(ifp->rt);
4651 if (ifp->idev->cnf.forwarding)
4652 addrconf_join_anycast(ifp);
4653 if (!ipv6_addr_any(&ifp->peer_addr))
4654 addrconf_prefix_route(&ifp->peer_addr, 128,
4655 ifp->idev->dev, 0, 0);
4658 if (ifp->idev->cnf.forwarding)
4659 addrconf_leave_anycast(ifp);
4660 addrconf_leave_solict(ifp->idev, &ifp->addr);
4661 if (!ipv6_addr_any(&ifp->peer_addr)) {
4662 struct rt6_info *rt;
4663 struct net_device *dev = ifp->idev->dev;
4665 rt = rt6_lookup(dev_net(dev), &ifp->peer_addr, NULL,
4673 dst_hold(&ifp->rt->dst);
4675 if (ip6_del_rt(ifp->rt))
4676 dst_free(&ifp->rt->dst);
4679 atomic_inc(&net->ipv6.dev_addr_genid);
4680 rt_genid_bump_ipv6(net);
4683 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4686 if (likely(ifp->idev->dead == 0))
4687 __ipv6_ifa_notify(event, ifp);
4688 rcu_read_unlock_bh();
4691 #ifdef CONFIG_SYSCTL
4694 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
4695 void __user *buffer, size_t *lenp, loff_t *ppos)
4697 int *valp = ctl->data;
4700 struct ctl_table lctl;
4704 * ctl->data points to idev->cnf.forwarding, we should
4705 * not modify it until we get the rtnl lock.
4710 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4713 ret = addrconf_fixup_forwarding(ctl, valp, val);
4719 static void dev_disable_change(struct inet6_dev *idev)
4721 struct netdev_notifier_info info;
4723 if (!idev || !idev->dev)
4726 netdev_notifier_info_init(&info, idev->dev);
4727 if (idev->cnf.disable_ipv6)
4728 addrconf_notify(NULL, NETDEV_DOWN, &info);
4730 addrconf_notify(NULL, NETDEV_UP, &info);
4733 static void addrconf_disable_change(struct net *net, __s32 newf)
4735 struct net_device *dev;
4736 struct inet6_dev *idev;
4739 for_each_netdev_rcu(net, dev) {
4740 idev = __in6_dev_get(dev);
4742 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4743 idev->cnf.disable_ipv6 = newf;
4745 dev_disable_change(idev);
4751 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
4756 if (!rtnl_trylock())
4757 return restart_syscall();
4759 net = (struct net *)table->extra2;
4763 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4768 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4769 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4770 addrconf_disable_change(net, newf);
4771 } else if ((!newf) ^ (!old))
4772 dev_disable_change((struct inet6_dev *)table->extra1);
4779 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
4780 void __user *buffer, size_t *lenp, loff_t *ppos)
4782 int *valp = ctl->data;
4785 struct ctl_table lctl;
4789 * ctl->data points to idev->cnf.disable_ipv6, we should
4790 * not modify it until we get the rtnl lock.
4795 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4798 ret = addrconf_disable_ipv6(ctl, valp, val);
4805 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
4806 void __user *buffer, size_t *lenp, loff_t *ppos)
4808 int *valp = ctl->data;
4813 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4816 if (write && old != new) {
4817 struct net *net = ctl->extra2;
4819 if (!rtnl_trylock())
4820 return restart_syscall();
4822 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
4823 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
4824 NETCONFA_IFINDEX_DEFAULT,
4825 net->ipv6.devconf_dflt);
4826 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
4827 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
4828 NETCONFA_IFINDEX_ALL,
4829 net->ipv6.devconf_all);
4831 struct inet6_dev *idev = ctl->extra1;
4833 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
4844 static struct addrconf_sysctl_table
4846 struct ctl_table_header *sysctl_header;
4847 struct ctl_table addrconf_vars[DEVCONF_MAX+1];
4848 } addrconf_sysctl __read_mostly = {
4849 .sysctl_header = NULL,
4852 .procname = "forwarding",
4853 .data = &ipv6_devconf.forwarding,
4854 .maxlen = sizeof(int),
4856 .proc_handler = addrconf_sysctl_forward,
4859 .procname = "hop_limit",
4860 .data = &ipv6_devconf.hop_limit,
4861 .maxlen = sizeof(int),
4863 .proc_handler = proc_dointvec,
4867 .data = &ipv6_devconf.mtu6,
4868 .maxlen = sizeof(int),
4870 .proc_handler = proc_dointvec,
4873 .procname = "accept_ra",
4874 .data = &ipv6_devconf.accept_ra,
4875 .maxlen = sizeof(int),
4877 .proc_handler = proc_dointvec,
4880 .procname = "accept_redirects",
4881 .data = &ipv6_devconf.accept_redirects,
4882 .maxlen = sizeof(int),
4884 .proc_handler = proc_dointvec,
4887 .procname = "autoconf",
4888 .data = &ipv6_devconf.autoconf,
4889 .maxlen = sizeof(int),
4891 .proc_handler = proc_dointvec,
4894 .procname = "dad_transmits",
4895 .data = &ipv6_devconf.dad_transmits,
4896 .maxlen = sizeof(int),
4898 .proc_handler = proc_dointvec,
4901 .procname = "router_solicitations",
4902 .data = &ipv6_devconf.rtr_solicits,
4903 .maxlen = sizeof(int),
4905 .proc_handler = proc_dointvec,
4908 .procname = "router_solicitation_interval",
4909 .data = &ipv6_devconf.rtr_solicit_interval,
4910 .maxlen = sizeof(int),
4912 .proc_handler = proc_dointvec_jiffies,
4915 .procname = "router_solicitation_delay",
4916 .data = &ipv6_devconf.rtr_solicit_delay,
4917 .maxlen = sizeof(int),
4919 .proc_handler = proc_dointvec_jiffies,
4922 .procname = "force_mld_version",
4923 .data = &ipv6_devconf.force_mld_version,
4924 .maxlen = sizeof(int),
4926 .proc_handler = proc_dointvec,
4929 .procname = "mldv1_unsolicited_report_interval",
4931 &ipv6_devconf.mldv1_unsolicited_report_interval,
4932 .maxlen = sizeof(int),
4934 .proc_handler = proc_dointvec_ms_jiffies,
4937 .procname = "mldv2_unsolicited_report_interval",
4939 &ipv6_devconf.mldv2_unsolicited_report_interval,
4940 .maxlen = sizeof(int),
4942 .proc_handler = proc_dointvec_ms_jiffies,
4945 .procname = "use_tempaddr",
4946 .data = &ipv6_devconf.use_tempaddr,
4947 .maxlen = sizeof(int),
4949 .proc_handler = proc_dointvec,
4952 .procname = "temp_valid_lft",
4953 .data = &ipv6_devconf.temp_valid_lft,
4954 .maxlen = sizeof(int),
4956 .proc_handler = proc_dointvec,
4959 .procname = "temp_prefered_lft",
4960 .data = &ipv6_devconf.temp_prefered_lft,
4961 .maxlen = sizeof(int),
4963 .proc_handler = proc_dointvec,
4966 .procname = "regen_max_retry",
4967 .data = &ipv6_devconf.regen_max_retry,
4968 .maxlen = sizeof(int),
4970 .proc_handler = proc_dointvec,
4973 .procname = "max_desync_factor",
4974 .data = &ipv6_devconf.max_desync_factor,
4975 .maxlen = sizeof(int),
4977 .proc_handler = proc_dointvec,
4980 .procname = "max_addresses",
4981 .data = &ipv6_devconf.max_addresses,
4982 .maxlen = sizeof(int),
4984 .proc_handler = proc_dointvec,
4987 .procname = "accept_ra_defrtr",
4988 .data = &ipv6_devconf.accept_ra_defrtr,
4989 .maxlen = sizeof(int),
4991 .proc_handler = proc_dointvec,
4994 .procname = "accept_ra_pinfo",
4995 .data = &ipv6_devconf.accept_ra_pinfo,
4996 .maxlen = sizeof(int),
4998 .proc_handler = proc_dointvec,
5000 #ifdef CONFIG_IPV6_ROUTER_PREF
5002 .procname = "accept_ra_rtr_pref",
5003 .data = &ipv6_devconf.accept_ra_rtr_pref,
5004 .maxlen = sizeof(int),
5006 .proc_handler = proc_dointvec,
5009 .procname = "router_probe_interval",
5010 .data = &ipv6_devconf.rtr_probe_interval,
5011 .maxlen = sizeof(int),
5013 .proc_handler = proc_dointvec_jiffies,
5015 #ifdef CONFIG_IPV6_ROUTE_INFO
5017 .procname = "accept_ra_rt_info_max_plen",
5018 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
5019 .maxlen = sizeof(int),
5021 .proc_handler = proc_dointvec,
5026 .procname = "proxy_ndp",
5027 .data = &ipv6_devconf.proxy_ndp,
5028 .maxlen = sizeof(int),
5030 .proc_handler = addrconf_sysctl_proxy_ndp,
5033 .procname = "accept_source_route",
5034 .data = &ipv6_devconf.accept_source_route,
5035 .maxlen = sizeof(int),
5037 .proc_handler = proc_dointvec,
5039 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5041 .procname = "optimistic_dad",
5042 .data = &ipv6_devconf.optimistic_dad,
5043 .maxlen = sizeof(int),
5045 .proc_handler = proc_dointvec,
5049 #ifdef CONFIG_IPV6_MROUTE
5051 .procname = "mc_forwarding",
5052 .data = &ipv6_devconf.mc_forwarding,
5053 .maxlen = sizeof(int),
5055 .proc_handler = proc_dointvec,
5059 .procname = "disable_ipv6",
5060 .data = &ipv6_devconf.disable_ipv6,
5061 .maxlen = sizeof(int),
5063 .proc_handler = addrconf_sysctl_disable,
5066 .procname = "accept_dad",
5067 .data = &ipv6_devconf.accept_dad,
5068 .maxlen = sizeof(int),
5070 .proc_handler = proc_dointvec,
5073 .procname = "force_tllao",
5074 .data = &ipv6_devconf.force_tllao,
5075 .maxlen = sizeof(int),
5077 .proc_handler = proc_dointvec
5080 .procname = "ndisc_notify",
5081 .data = &ipv6_devconf.ndisc_notify,
5082 .maxlen = sizeof(int),
5084 .proc_handler = proc_dointvec
5087 .procname = "suppress_frag_ndisc",
5088 .data = &ipv6_devconf.suppress_frag_ndisc,
5089 .maxlen = sizeof(int),
5091 .proc_handler = proc_dointvec
5099 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
5100 struct inet6_dev *idev, struct ipv6_devconf *p)
5103 struct addrconf_sysctl_table *t;
5104 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
5106 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
5110 for (i = 0; t->addrconf_vars[i].data; i++) {
5111 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
5112 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
5113 t->addrconf_vars[i].extra2 = net;
5116 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
5118 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
5119 if (t->sysctl_header == NULL)
5131 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5133 struct addrconf_sysctl_table *t;
5135 if (p->sysctl == NULL)
5140 unregister_net_sysctl_table(t->sysctl_header);
5144 static void addrconf_sysctl_register(struct inet6_dev *idev)
5146 neigh_sysctl_register(idev->dev, idev->nd_parms,
5147 &ndisc_ifinfo_sysctl_change);
5148 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
5152 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
5154 __addrconf_sysctl_unregister(&idev->cnf);
5155 neigh_sysctl_unregister(idev->nd_parms);
5161 static int __net_init addrconf_init_net(struct net *net)
5164 struct ipv6_devconf *all, *dflt;
5166 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
5170 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
5172 goto err_alloc_dflt;
5174 /* these will be inherited by all namespaces */
5175 dflt->autoconf = ipv6_defaults.autoconf;
5176 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
5178 net->ipv6.devconf_all = all;
5179 net->ipv6.devconf_dflt = dflt;
5181 #ifdef CONFIG_SYSCTL
5182 err = __addrconf_sysctl_register(net, "all", NULL, all);
5186 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
5192 #ifdef CONFIG_SYSCTL
5194 __addrconf_sysctl_unregister(all);
5204 static void __net_exit addrconf_exit_net(struct net *net)
5206 #ifdef CONFIG_SYSCTL
5207 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5208 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5210 if (!net_eq(net, &init_net)) {
5211 kfree(net->ipv6.devconf_dflt);
5212 kfree(net->ipv6.devconf_all);
5216 static struct pernet_operations addrconf_ops = {
5217 .init = addrconf_init_net,
5218 .exit = addrconf_exit_net,
5221 static struct rtnl_af_ops inet6_ops = {
5223 .fill_link_af = inet6_fill_link_af,
5224 .get_link_af_size = inet6_get_link_af_size,
5225 .set_link_af = inet6_set_link_af,
5229 * Init / cleanup code
5232 int __init addrconf_init(void)
5236 err = ipv6_addr_label_init();
5238 pr_crit("%s: cannot initialize default policy table: %d\n",
5243 err = register_pernet_subsys(&addrconf_ops);
5247 /* The addrconf netdev notifier requires that loopback_dev
5248 * has it's ipv6 private information allocated and setup
5249 * before it can bring up and give link-local addresses
5250 * to other devices which are up.
5252 * Unfortunately, loopback_dev is not necessarily the first
5253 * entry in the global dev_base list of net devices. In fact,
5254 * it is likely to be the very last entry on that list.
5255 * So this causes the notifier registry below to try and
5256 * give link-local addresses to all devices besides loopback_dev
5257 * first, then loopback_dev, which cases all the non-loopback_dev
5258 * devices to fail to get a link-local address.
5260 * So, as a temporary fix, allocate the ipv6 structure for
5261 * loopback_dev first by hand.
5262 * Longer term, all of the dependencies ipv6 has upon the loopback
5263 * device and it being up should be removed.
5266 if (!ipv6_add_dev(init_net.loopback_dev))
5272 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5273 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5275 register_netdevice_notifier(&ipv6_dev_notf);
5279 rtnl_af_register(&inet6_ops);
5281 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5286 /* Only the first call to __rtnl_register can fail */
5287 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5288 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5289 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5290 inet6_dump_ifaddr, NULL);
5291 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5292 inet6_dump_ifmcaddr, NULL);
5293 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5294 inet6_dump_ifacaddr, NULL);
5295 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
5296 inet6_netconf_dump_devconf, NULL);
5298 ipv6_addr_label_rtnl_register();
5302 rtnl_af_unregister(&inet6_ops);
5303 unregister_netdevice_notifier(&ipv6_dev_notf);
5305 unregister_pernet_subsys(&addrconf_ops);
5307 ipv6_addr_label_cleanup();
5312 void addrconf_cleanup(void)
5314 struct net_device *dev;
5317 unregister_netdevice_notifier(&ipv6_dev_notf);
5318 unregister_pernet_subsys(&addrconf_ops);
5319 ipv6_addr_label_cleanup();
5323 __rtnl_af_unregister(&inet6_ops);
5325 /* clean dev list */
5326 for_each_netdev(&init_net, dev) {
5327 if (__in6_dev_get(dev) == NULL)
5329 addrconf_ifdown(dev, 1);
5331 addrconf_ifdown(init_net.loopback_dev, 2);
5336 spin_lock_bh(&addrconf_hash_lock);
5337 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5338 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5339 spin_unlock_bh(&addrconf_hash_lock);
5341 del_timer(&addr_chk_timer);