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.
1107 if (tmp_prefered_lft <= regen_advance) {
1114 addr_flags = IFA_F_TEMPORARY;
1115 /* set in addrconf_prefix_rcv() */
1116 if (ifp->flags & IFA_F_OPTIMISTIC)
1117 addr_flags |= IFA_F_OPTIMISTIC;
1119 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1120 ipv6_addr_scope(&addr), addr_flags,
1121 tmp_valid_lft, tmp_prefered_lft);
1125 pr_info("%s: retry temporary address regeneration\n", __func__);
1127 write_lock_bh(&idev->lock);
1131 spin_lock_bh(&ift->lock);
1134 ift->tstamp = tmp_tstamp;
1135 spin_unlock_bh(&ift->lock);
1137 addrconf_dad_start(ift);
1145 * Choose an appropriate source address (RFC3484)
1148 IPV6_SADDR_RULE_INIT = 0,
1149 IPV6_SADDR_RULE_LOCAL,
1150 IPV6_SADDR_RULE_SCOPE,
1151 IPV6_SADDR_RULE_PREFERRED,
1152 #ifdef CONFIG_IPV6_MIP6
1153 IPV6_SADDR_RULE_HOA,
1155 IPV6_SADDR_RULE_OIF,
1156 IPV6_SADDR_RULE_LABEL,
1157 IPV6_SADDR_RULE_PRIVACY,
1158 IPV6_SADDR_RULE_ORCHID,
1159 IPV6_SADDR_RULE_PREFIX,
1163 struct ipv6_saddr_score {
1166 struct inet6_ifaddr *ifa;
1167 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1172 struct ipv6_saddr_dst {
1173 const struct in6_addr *addr;
1180 static inline int ipv6_saddr_preferred(int type)
1182 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1187 static int ipv6_get_saddr_eval(struct net *net,
1188 struct ipv6_saddr_score *score,
1189 struct ipv6_saddr_dst *dst,
1194 if (i <= score->rule) {
1196 case IPV6_SADDR_RULE_SCOPE:
1197 ret = score->scopedist;
1199 case IPV6_SADDR_RULE_PREFIX:
1200 ret = score->matchlen;
1203 ret = !!test_bit(i, score->scorebits);
1209 case IPV6_SADDR_RULE_INIT:
1210 /* Rule 0: remember if hiscore is not ready yet */
1213 case IPV6_SADDR_RULE_LOCAL:
1214 /* Rule 1: Prefer same address */
1215 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1217 case IPV6_SADDR_RULE_SCOPE:
1218 /* Rule 2: Prefer appropriate scope
1223 * ---+--+-+---> scope
1225 * | d is scope of the destination.
1227 * | \ <- smaller scope is better if
1228 * B-15 | \ if scope is enough for destination.
1229 * | ret = B - scope (-1 <= scope >= d <= 15).
1231 * |/ <- greater is better
1232 * -C / if scope is not enough for destination.
1233 * /| ret = scope - C (-1 <= d < scope <= 15).
1235 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1236 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1237 * Assume B = 0 and we get C > 29.
1239 ret = __ipv6_addr_src_scope(score->addr_type);
1240 if (ret >= dst->scope)
1243 ret -= 128; /* 30 is enough */
1244 score->scopedist = ret;
1246 case IPV6_SADDR_RULE_PREFERRED:
1247 /* Rule 3: Avoid deprecated and optimistic addresses */
1248 ret = ipv6_saddr_preferred(score->addr_type) ||
1249 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1251 #ifdef CONFIG_IPV6_MIP6
1252 case IPV6_SADDR_RULE_HOA:
1254 /* Rule 4: Prefer home address */
1255 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1256 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1260 case IPV6_SADDR_RULE_OIF:
1261 /* Rule 5: Prefer outgoing interface */
1262 ret = (!dst->ifindex ||
1263 dst->ifindex == score->ifa->idev->dev->ifindex);
1265 case IPV6_SADDR_RULE_LABEL:
1266 /* Rule 6: Prefer matching label */
1267 ret = ipv6_addr_label(net,
1268 &score->ifa->addr, score->addr_type,
1269 score->ifa->idev->dev->ifindex) == dst->label;
1271 case IPV6_SADDR_RULE_PRIVACY:
1273 /* Rule 7: Prefer public address
1274 * Note: prefer temporary address if use_tempaddr >= 2
1276 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1277 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1278 score->ifa->idev->cnf.use_tempaddr >= 2;
1279 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1282 case IPV6_SADDR_RULE_ORCHID:
1283 /* Rule 8-: Prefer ORCHID vs ORCHID or
1284 * non-ORCHID vs non-ORCHID
1286 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1287 ipv6_addr_orchid(dst->addr));
1289 case IPV6_SADDR_RULE_PREFIX:
1290 /* Rule 8: Use longest matching prefix */
1291 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1292 if (ret > score->ifa->prefix_len)
1293 ret = score->ifa->prefix_len;
1294 score->matchlen = ret;
1301 __set_bit(i, score->scorebits);
1307 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1308 const struct in6_addr *daddr, unsigned int prefs,
1309 struct in6_addr *saddr)
1311 struct ipv6_saddr_score scores[2],
1312 *score = &scores[0], *hiscore = &scores[1];
1313 struct ipv6_saddr_dst dst;
1314 struct net_device *dev;
1317 dst_type = __ipv6_addr_type(daddr);
1319 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1320 dst.scope = __ipv6_addr_src_scope(dst_type);
1321 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1325 hiscore->ifa = NULL;
1329 for_each_netdev_rcu(net, dev) {
1330 struct inet6_dev *idev;
1332 /* Candidate Source Address (section 4)
1333 * - multicast and link-local destination address,
1334 * the set of candidate source address MUST only
1335 * include addresses assigned to interfaces
1336 * belonging to the same link as the outgoing
1338 * (- For site-local destination addresses, the
1339 * set of candidate source addresses MUST only
1340 * include addresses assigned to interfaces
1341 * belonging to the same site as the outgoing
1344 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1345 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1346 dst.ifindex && dev->ifindex != dst.ifindex)
1349 idev = __in6_dev_get(dev);
1353 read_lock_bh(&idev->lock);
1354 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1358 * - Tentative Address (RFC2462 section 5.4)
1359 * - A tentative address is not considered
1360 * "assigned to an interface" in the traditional
1361 * sense, unless it is also flagged as optimistic.
1362 * - Candidate Source Address (section 4)
1363 * - In any case, anycast addresses, multicast
1364 * addresses, and the unspecified address MUST
1365 * NOT be included in a candidate set.
1367 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1368 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1371 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1373 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1374 score->addr_type & IPV6_ADDR_MULTICAST)) {
1375 LIMIT_NETDEBUG(KERN_DEBUG
1376 "ADDRCONF: unspecified / multicast address "
1377 "assigned as unicast address on %s",
1383 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1385 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1386 int minihiscore, miniscore;
1388 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1389 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1391 if (minihiscore > miniscore) {
1392 if (i == IPV6_SADDR_RULE_SCOPE &&
1393 score->scopedist > 0) {
1396 * each remaining entry
1397 * has too small (not enough)
1398 * scope, because ifa entries
1399 * are sorted by their scope
1405 } else if (minihiscore < miniscore) {
1407 in6_ifa_put(hiscore->ifa);
1409 in6_ifa_hold(score->ifa);
1411 swap(hiscore, score);
1413 /* restore our iterator */
1414 score->ifa = hiscore->ifa;
1421 read_unlock_bh(&idev->lock);
1426 return -EADDRNOTAVAIL;
1428 *saddr = hiscore->ifa->addr;
1429 in6_ifa_put(hiscore->ifa);
1432 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1434 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1437 struct inet6_ifaddr *ifp;
1438 int err = -EADDRNOTAVAIL;
1440 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1441 if (ifp->scope == IFA_LINK &&
1442 !(ifp->flags & banned_flags)) {
1451 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1454 struct inet6_dev *idev;
1455 int err = -EADDRNOTAVAIL;
1458 idev = __in6_dev_get(dev);
1460 read_lock_bh(&idev->lock);
1461 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1462 read_unlock_bh(&idev->lock);
1468 static int ipv6_count_addresses(struct inet6_dev *idev)
1471 struct inet6_ifaddr *ifp;
1473 read_lock_bh(&idev->lock);
1474 list_for_each_entry(ifp, &idev->addr_list, if_list)
1476 read_unlock_bh(&idev->lock);
1480 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1481 const struct net_device *dev, int strict)
1483 struct inet6_ifaddr *ifp;
1484 unsigned int hash = inet6_addr_hash(addr);
1487 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1488 if (!net_eq(dev_net(ifp->idev->dev), net))
1490 if (ipv6_addr_equal(&ifp->addr, addr) &&
1491 !(ifp->flags&IFA_F_TENTATIVE) &&
1492 (dev == NULL || ifp->idev->dev == dev ||
1493 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1494 rcu_read_unlock_bh();
1499 rcu_read_unlock_bh();
1502 EXPORT_SYMBOL(ipv6_chk_addr);
1504 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1505 struct net_device *dev)
1507 unsigned int hash = inet6_addr_hash(addr);
1508 struct inet6_ifaddr *ifp;
1510 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1511 if (!net_eq(dev_net(ifp->idev->dev), net))
1513 if (ipv6_addr_equal(&ifp->addr, addr)) {
1514 if (dev == NULL || ifp->idev->dev == dev)
1521 /* Compares an address/prefix_len with addresses on device @dev.
1522 * If one is found it returns true.
1524 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1525 const unsigned int prefix_len, struct net_device *dev)
1527 struct inet6_dev *idev;
1528 struct inet6_ifaddr *ifa;
1532 idev = __in6_dev_get(dev);
1534 read_lock_bh(&idev->lock);
1535 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1536 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1540 read_unlock_bh(&idev->lock);
1546 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1548 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1550 struct inet6_dev *idev;
1551 struct inet6_ifaddr *ifa;
1556 idev = __in6_dev_get(dev);
1558 read_lock_bh(&idev->lock);
1559 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1560 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1565 read_unlock_bh(&idev->lock);
1570 EXPORT_SYMBOL(ipv6_chk_prefix);
1572 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1573 struct net_device *dev, int strict)
1575 struct inet6_ifaddr *ifp, *result = NULL;
1576 unsigned int hash = inet6_addr_hash(addr);
1579 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1580 if (!net_eq(dev_net(ifp->idev->dev), net))
1582 if (ipv6_addr_equal(&ifp->addr, addr)) {
1583 if (dev == NULL || ifp->idev->dev == dev ||
1584 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1591 rcu_read_unlock_bh();
1596 /* Gets referenced address, destroys ifaddr */
1598 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1600 if (ifp->flags&IFA_F_PERMANENT) {
1601 spin_lock_bh(&ifp->lock);
1602 addrconf_del_dad_timer(ifp);
1603 ifp->flags |= IFA_F_TENTATIVE;
1605 ifp->flags |= IFA_F_DADFAILED;
1606 spin_unlock_bh(&ifp->lock);
1608 ipv6_ifa_notify(0, ifp);
1610 } else if (ifp->flags&IFA_F_TEMPORARY) {
1611 struct inet6_ifaddr *ifpub;
1612 spin_lock_bh(&ifp->lock);
1615 in6_ifa_hold(ifpub);
1616 spin_unlock_bh(&ifp->lock);
1617 ipv6_create_tempaddr(ifpub, ifp);
1620 spin_unlock_bh(&ifp->lock);
1627 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1631 spin_lock(&ifp->state_lock);
1632 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1633 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1636 spin_unlock(&ifp->state_lock);
1641 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1643 struct inet6_dev *idev = ifp->idev;
1645 if (addrconf_dad_end(ifp)) {
1650 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1651 ifp->idev->dev->name, &ifp->addr);
1653 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1654 struct in6_addr addr;
1656 addr.s6_addr32[0] = htonl(0xfe800000);
1657 addr.s6_addr32[1] = 0;
1659 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1660 ipv6_addr_equal(&ifp->addr, &addr)) {
1661 /* DAD failed for link-local based on MAC address */
1662 idev->cnf.disable_ipv6 = 1;
1664 pr_info("%s: IPv6 being disabled!\n",
1665 ifp->idev->dev->name);
1669 addrconf_dad_stop(ifp, 1);
1672 /* Join to solicited addr multicast group. */
1674 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1676 struct in6_addr maddr;
1678 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1681 addrconf_addr_solict_mult(addr, &maddr);
1682 ipv6_dev_mc_inc(dev, &maddr);
1685 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1687 struct in6_addr maddr;
1689 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1692 addrconf_addr_solict_mult(addr, &maddr);
1693 __ipv6_dev_mc_dec(idev, &maddr);
1696 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1698 struct in6_addr addr;
1699 if (ifp->prefix_len >= 127) /* RFC 6164 */
1701 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1702 if (ipv6_addr_any(&addr))
1704 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1707 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1709 struct in6_addr addr;
1710 if (ifp->prefix_len >= 127) /* RFC 6164 */
1712 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1713 if (ipv6_addr_any(&addr))
1715 __ipv6_dev_ac_dec(ifp->idev, &addr);
1718 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1720 if (dev->addr_len != ETH_ALEN)
1722 memcpy(eui, dev->dev_addr, 3);
1723 memcpy(eui + 5, dev->dev_addr + 3, 3);
1726 * The zSeries OSA network cards can be shared among various
1727 * OS instances, but the OSA cards have only one MAC address.
1728 * This leads to duplicate address conflicts in conjunction
1729 * with IPv6 if more than one instance uses the same card.
1731 * The driver for these cards can deliver a unique 16-bit
1732 * identifier for each instance sharing the same card. It is
1733 * placed instead of 0xFFFE in the interface identifier. The
1734 * "u" bit of the interface identifier is not inverted in this
1735 * case. Hence the resulting interface identifier has local
1736 * scope according to RFC2373.
1739 eui[3] = (dev->dev_id >> 8) & 0xFF;
1740 eui[4] = dev->dev_id & 0xFF;
1749 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1751 if (dev->addr_len != IEEE802154_ADDR_LEN)
1753 memcpy(eui, dev->dev_addr, 8);
1758 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1760 union fwnet_hwaddr *ha;
1762 if (dev->addr_len != FWNET_ALEN)
1765 ha = (union fwnet_hwaddr *)dev->dev_addr;
1767 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1772 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1774 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1775 if (dev->addr_len != ARCNET_ALEN)
1778 eui[7] = *(u8 *)dev->dev_addr;
1782 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1784 if (dev->addr_len != INFINIBAND_ALEN)
1786 memcpy(eui, dev->dev_addr + 12, 8);
1791 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1795 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1796 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1797 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1798 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1799 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1800 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1804 memcpy(eui + 4, &addr, 4);
1808 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1810 if (dev->priv_flags & IFF_ISATAP)
1811 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1815 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1817 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1820 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
1822 memcpy(eui, dev->perm_addr, 3);
1823 memcpy(eui + 5, dev->perm_addr + 3, 3);
1830 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1832 switch (dev->type) {
1835 return addrconf_ifid_eui48(eui, dev);
1837 return addrconf_ifid_arcnet(eui, dev);
1838 case ARPHRD_INFINIBAND:
1839 return addrconf_ifid_infiniband(eui, dev);
1841 return addrconf_ifid_sit(eui, dev);
1843 return addrconf_ifid_gre(eui, dev);
1844 case ARPHRD_6LOWPAN:
1845 case ARPHRD_IEEE802154:
1846 return addrconf_ifid_eui64(eui, dev);
1847 case ARPHRD_IEEE1394:
1848 return addrconf_ifid_ieee1394(eui, dev);
1849 case ARPHRD_TUNNEL6:
1850 return addrconf_ifid_ip6tnl(eui, dev);
1855 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1858 struct inet6_ifaddr *ifp;
1860 read_lock_bh(&idev->lock);
1861 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1862 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1863 memcpy(eui, ifp->addr.s6_addr+8, 8);
1868 read_unlock_bh(&idev->lock);
1872 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1873 static void __ipv6_regen_rndid(struct inet6_dev *idev)
1876 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1877 idev->rndid[0] &= ~0x02;
1880 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1881 * check if generated address is not inappropriate
1883 * - Reserved subnet anycast (RFC 2526)
1884 * 11111101 11....11 1xxxxxxx
1885 * - ISATAP (RFC4214) 6.1
1886 * 00-00-5E-FE-xx-xx-xx-xx
1888 * - XXX: already assigned to an address on the device
1890 if (idev->rndid[0] == 0xfd &&
1891 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1892 (idev->rndid[7]&0x80))
1894 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1895 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1897 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1902 static void ipv6_regen_rndid(unsigned long data)
1904 struct inet6_dev *idev = (struct inet6_dev *) data;
1905 unsigned long expires;
1908 write_lock_bh(&idev->lock);
1913 __ipv6_regen_rndid(idev);
1916 idev->cnf.temp_prefered_lft * HZ -
1917 idev->cnf.regen_max_retry * idev->cnf.dad_transmits *
1918 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) -
1919 idev->cnf.max_desync_factor * HZ;
1920 if (time_before(expires, jiffies)) {
1921 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
1922 __func__, idev->dev->name);
1926 if (!mod_timer(&idev->regen_timer, expires))
1930 write_unlock_bh(&idev->lock);
1931 rcu_read_unlock_bh();
1935 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
1937 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1938 __ipv6_regen_rndid(idev);
1946 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1947 unsigned long expires, u32 flags)
1949 struct fib6_config cfg = {
1950 .fc_table = RT6_TABLE_PREFIX,
1951 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1952 .fc_ifindex = dev->ifindex,
1953 .fc_expires = expires,
1955 .fc_flags = RTF_UP | flags,
1956 .fc_nlinfo.nl_net = dev_net(dev),
1957 .fc_protocol = RTPROT_KERNEL,
1962 /* Prevent useless cloning on PtP SIT.
1963 This thing is done here expecting that the whole
1964 class of non-broadcast devices need not cloning.
1966 #if IS_ENABLED(CONFIG_IPV6_SIT)
1967 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1968 cfg.fc_flags |= RTF_NONEXTHOP;
1971 ip6_route_add(&cfg);
1975 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
1977 const struct net_device *dev,
1978 u32 flags, u32 noflags)
1980 struct fib6_node *fn;
1981 struct rt6_info *rt = NULL;
1982 struct fib6_table *table;
1984 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
1988 read_lock_bh(&table->tb6_lock);
1989 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
1992 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1993 if (rt->dst.dev->ifindex != dev->ifindex)
1995 if ((rt->rt6i_flags & flags) != flags)
1997 if ((rt->rt6i_flags & noflags) != 0)
2003 read_unlock_bh(&table->tb6_lock);
2008 /* Create "default" multicast route to the interface */
2010 static void addrconf_add_mroute(struct net_device *dev)
2012 struct fib6_config cfg = {
2013 .fc_table = RT6_TABLE_LOCAL,
2014 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2015 .fc_ifindex = dev->ifindex,
2018 .fc_nlinfo.nl_net = dev_net(dev),
2021 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2023 ip6_route_add(&cfg);
2026 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2028 struct inet6_dev *idev;
2032 idev = ipv6_find_idev(dev);
2034 return ERR_PTR(-ENOBUFS);
2036 if (idev->cnf.disable_ipv6)
2037 return ERR_PTR(-EACCES);
2039 /* Add default multicast route */
2040 if (!(dev->flags & IFF_LOOPBACK))
2041 addrconf_add_mroute(dev);
2046 static void manage_tempaddrs(struct inet6_dev *idev,
2047 struct inet6_ifaddr *ifp,
2048 __u32 valid_lft, __u32 prefered_lft,
2049 bool create, unsigned long now)
2052 struct inet6_ifaddr *ift;
2054 read_lock_bh(&idev->lock);
2055 /* update all temporary addresses in the list */
2056 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2057 int age, max_valid, max_prefered;
2059 if (ifp != ift->ifpub)
2062 /* RFC 4941 section 3.3:
2063 * If a received option will extend the lifetime of a public
2064 * address, the lifetimes of temporary addresses should
2065 * be extended, subject to the overall constraint that no
2066 * temporary addresses should ever remain "valid" or "preferred"
2067 * for a time longer than (TEMP_VALID_LIFETIME) or
2068 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2070 age = (now - ift->cstamp) / HZ;
2071 max_valid = idev->cnf.temp_valid_lft - age;
2075 max_prefered = idev->cnf.temp_prefered_lft -
2076 idev->cnf.max_desync_factor - age;
2077 if (max_prefered < 0)
2080 if (valid_lft > max_valid)
2081 valid_lft = max_valid;
2083 if (prefered_lft > max_prefered)
2084 prefered_lft = max_prefered;
2086 spin_lock(&ift->lock);
2088 ift->valid_lft = valid_lft;
2089 ift->prefered_lft = prefered_lft;
2091 if (prefered_lft > 0)
2092 ift->flags &= ~IFA_F_DEPRECATED;
2094 spin_unlock(&ift->lock);
2095 if (!(flags&IFA_F_TENTATIVE))
2096 ipv6_ifa_notify(0, ift);
2099 if ((create || list_empty(&idev->tempaddr_list)) &&
2100 idev->cnf.use_tempaddr > 0) {
2101 /* When a new public address is created as described
2102 * in [ADDRCONF], also create a new temporary address.
2103 * Also create a temporary address if it's enabled but
2104 * no temporary address currently exists.
2106 read_unlock_bh(&idev->lock);
2107 ipv6_create_tempaddr(ifp, NULL);
2109 read_unlock_bh(&idev->lock);
2113 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2115 struct prefix_info *pinfo;
2119 struct inet6_dev *in6_dev;
2120 struct net *net = dev_net(dev);
2122 pinfo = (struct prefix_info *) opt;
2124 if (len < sizeof(struct prefix_info)) {
2125 ADBG("addrconf: prefix option too short\n");
2130 * Validation checks ([ADDRCONF], page 19)
2133 addr_type = ipv6_addr_type(&pinfo->prefix);
2135 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2138 valid_lft = ntohl(pinfo->valid);
2139 prefered_lft = ntohl(pinfo->prefered);
2141 if (prefered_lft > valid_lft) {
2142 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2146 in6_dev = in6_dev_get(dev);
2148 if (in6_dev == NULL) {
2149 net_dbg_ratelimited("addrconf: device %s not configured\n",
2155 * Two things going on here:
2156 * 1) Add routes for on-link prefixes
2157 * 2) Configure prefixes with the auto flag set
2160 if (pinfo->onlink) {
2161 struct rt6_info *rt;
2162 unsigned long rt_expires;
2164 /* Avoid arithmetic overflow. Really, we could
2165 * save rt_expires in seconds, likely valid_lft,
2166 * but it would require division in fib gc, that it
2170 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2172 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2174 if (addrconf_finite_timeout(rt_expires))
2177 rt = addrconf_get_prefix_route(&pinfo->prefix,
2180 RTF_ADDRCONF | RTF_PREFIX_RT,
2181 RTF_GATEWAY | RTF_DEFAULT);
2184 /* Autoconf prefix route */
2185 if (valid_lft == 0) {
2188 } else if (addrconf_finite_timeout(rt_expires)) {
2190 rt6_set_expires(rt, jiffies + rt_expires);
2192 rt6_clean_expires(rt);
2194 } else if (valid_lft) {
2195 clock_t expires = 0;
2196 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2197 if (addrconf_finite_timeout(rt_expires)) {
2199 flags |= RTF_EXPIRES;
2200 expires = jiffies_to_clock_t(rt_expires);
2202 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2203 dev, expires, flags);
2208 /* Try to figure out our local address for this prefix */
2210 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2211 struct inet6_ifaddr *ifp;
2212 struct in6_addr addr;
2213 int create = 0, update_lft = 0;
2214 bool tokenized = false;
2216 if (pinfo->prefix_len == 64) {
2217 memcpy(&addr, &pinfo->prefix, 8);
2219 if (!ipv6_addr_any(&in6_dev->token)) {
2220 read_lock_bh(&in6_dev->lock);
2221 memcpy(addr.s6_addr + 8,
2222 in6_dev->token.s6_addr + 8, 8);
2223 read_unlock_bh(&in6_dev->lock);
2225 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2226 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2227 in6_dev_put(in6_dev);
2232 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2234 in6_dev_put(in6_dev);
2239 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
2241 if (ifp == NULL && valid_lft) {
2242 int max_addresses = in6_dev->cnf.max_addresses;
2245 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2246 if (in6_dev->cnf.optimistic_dad &&
2247 !net->ipv6.devconf_all->forwarding && sllao)
2248 addr_flags = IFA_F_OPTIMISTIC;
2251 /* Do not allow to create too much of autoconfigured
2252 * addresses; this would be too easy way to crash kernel.
2254 if (!max_addresses ||
2255 ipv6_count_addresses(in6_dev) < max_addresses)
2256 ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2258 addr_type&IPV6_ADDR_SCOPE_MASK,
2259 addr_flags, valid_lft,
2262 if (IS_ERR_OR_NULL(ifp)) {
2263 in6_dev_put(in6_dev);
2267 ifp->flags |= IFA_F_MANAGETEMPADDR;
2270 ifp->cstamp = jiffies;
2271 ifp->tokenized = tokenized;
2272 addrconf_dad_start(ifp);
2280 /* update lifetime (RFC2462 5.5.3 e) */
2281 spin_lock(&ifp->lock);
2283 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2284 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2287 if (!update_lft && !create && stored_lft) {
2288 const u32 minimum_lft = min(
2289 stored_lft, (u32)MIN_VALID_LIFETIME);
2290 valid_lft = max(valid_lft, minimum_lft);
2292 /* RFC4862 Section 5.5.3e:
2293 * "Note that the preferred lifetime of the
2294 * corresponding address is always reset to
2295 * the Preferred Lifetime in the received
2296 * Prefix Information option, regardless of
2297 * whether the valid lifetime is also reset or
2300 * So we should always update prefered_lft here.
2306 ifp->valid_lft = valid_lft;
2307 ifp->prefered_lft = prefered_lft;
2310 ifp->flags &= ~IFA_F_DEPRECATED;
2311 spin_unlock(&ifp->lock);
2313 if (!(flags&IFA_F_TENTATIVE))
2314 ipv6_ifa_notify(0, ifp);
2316 spin_unlock(&ifp->lock);
2318 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2325 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2326 in6_dev_put(in6_dev);
2330 * Set destination address.
2331 * Special case for SIT interfaces where we create a new "virtual"
2334 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2336 struct in6_ifreq ireq;
2337 struct net_device *dev;
2343 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2346 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2352 #if IS_ENABLED(CONFIG_IPV6_SIT)
2353 if (dev->type == ARPHRD_SIT) {
2354 const struct net_device_ops *ops = dev->netdev_ops;
2356 struct ip_tunnel_parm p;
2358 err = -EADDRNOTAVAIL;
2359 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2362 memset(&p, 0, sizeof(p));
2363 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2367 p.iph.protocol = IPPROTO_IPV6;
2369 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2371 if (ops->ndo_do_ioctl) {
2372 mm_segment_t oldfs = get_fs();
2375 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2382 dev = __dev_get_by_name(net, p.name);
2385 err = dev_open(dev);
2396 * Manual configuration of address on an interface
2398 static int inet6_addr_add(struct net *net, int ifindex,
2399 const struct in6_addr *pfx,
2400 const struct in6_addr *peer_pfx,
2401 unsigned int plen, __u32 ifa_flags,
2402 __u32 prefered_lft, __u32 valid_lft)
2404 struct inet6_ifaddr *ifp;
2405 struct inet6_dev *idev;
2406 struct net_device *dev;
2410 unsigned long timeout;
2417 /* check the lifetime */
2418 if (!valid_lft || prefered_lft > valid_lft)
2421 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2424 dev = __dev_get_by_index(net, ifindex);
2428 idev = addrconf_add_dev(dev);
2430 return PTR_ERR(idev);
2432 scope = ipv6_addr_scope(pfx);
2434 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2435 if (addrconf_finite_timeout(timeout)) {
2436 expires = jiffies_to_clock_t(timeout * HZ);
2437 valid_lft = timeout;
2438 flags = RTF_EXPIRES;
2442 ifa_flags |= IFA_F_PERMANENT;
2445 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2446 if (addrconf_finite_timeout(timeout)) {
2448 ifa_flags |= IFA_F_DEPRECATED;
2449 prefered_lft = timeout;
2452 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2453 valid_lft, prefered_lft);
2456 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2457 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2462 * Note that section 3.1 of RFC 4429 indicates
2463 * that the Optimistic flag should not be set for
2464 * manually configured addresses
2466 addrconf_dad_start(ifp);
2467 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2468 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2475 return PTR_ERR(ifp);
2478 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
2481 struct inet6_ifaddr *ifp;
2482 struct inet6_dev *idev;
2483 struct net_device *dev;
2488 dev = __dev_get_by_index(net, ifindex);
2492 if ((idev = __in6_dev_get(dev)) == NULL)
2495 read_lock_bh(&idev->lock);
2496 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2497 if (ifp->prefix_len == plen &&
2498 ipv6_addr_equal(pfx, &ifp->addr)) {
2500 read_unlock_bh(&idev->lock);
2506 read_unlock_bh(&idev->lock);
2507 return -EADDRNOTAVAIL;
2511 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2513 struct in6_ifreq ireq;
2516 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2519 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2523 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2524 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2525 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2530 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2532 struct in6_ifreq ireq;
2535 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2538 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2542 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2543 ireq.ifr6_prefixlen);
2548 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2549 int plen, int scope)
2551 struct inet6_ifaddr *ifp;
2553 ifp = ipv6_add_addr(idev, addr, NULL, plen,
2554 scope, IFA_F_PERMANENT,
2555 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2557 spin_lock_bh(&ifp->lock);
2558 ifp->flags &= ~IFA_F_TENTATIVE;
2559 spin_unlock_bh(&ifp->lock);
2560 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2565 #if IS_ENABLED(CONFIG_IPV6_SIT)
2566 static void sit_add_v4_addrs(struct inet6_dev *idev)
2568 struct in6_addr addr;
2569 struct net_device *dev;
2570 struct net *net = dev_net(idev->dev);
2576 memset(&addr, 0, sizeof(struct in6_addr));
2577 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2579 if (idev->dev->flags&IFF_POINTOPOINT) {
2580 addr.s6_addr32[0] = htonl(0xfe800000);
2584 scope = IPV6_ADDR_COMPATv4;
2586 pflags |= RTF_NONEXTHOP;
2589 if (addr.s6_addr32[3]) {
2590 add_addr(idev, &addr, plen, scope);
2591 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
2595 for_each_netdev(net, dev) {
2596 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2597 if (in_dev && (dev->flags & IFF_UP)) {
2598 struct in_ifaddr *ifa;
2602 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2604 addr.s6_addr32[3] = ifa->ifa_local;
2606 if (ifa->ifa_scope == RT_SCOPE_LINK)
2608 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2609 if (idev->dev->flags&IFF_POINTOPOINT)
2614 add_addr(idev, &addr, plen, flag);
2615 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2623 static void init_loopback(struct net_device *dev)
2625 struct inet6_dev *idev;
2626 struct net_device *sp_dev;
2627 struct inet6_ifaddr *sp_ifa;
2628 struct rt6_info *sp_rt;
2634 if ((idev = ipv6_find_idev(dev)) == NULL) {
2635 pr_debug("%s: add_dev failed\n", __func__);
2639 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2641 /* Add routes to other interface's IPv6 addresses */
2642 for_each_netdev(dev_net(dev), sp_dev) {
2643 if (!strcmp(sp_dev->name, dev->name))
2646 idev = __in6_dev_get(sp_dev);
2650 read_lock_bh(&idev->lock);
2651 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2653 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2659 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
2661 /* Failure cases are ignored */
2662 if (!IS_ERR(sp_rt)) {
2667 read_unlock_bh(&idev->lock);
2671 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
2673 struct inet6_ifaddr *ifp;
2674 u32 addr_flags = IFA_F_PERMANENT;
2676 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2677 if (idev->cnf.optimistic_dad &&
2678 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2679 addr_flags |= IFA_F_OPTIMISTIC;
2683 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
2684 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2686 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2687 addrconf_dad_start(ifp);
2692 static void addrconf_dev_config(struct net_device *dev)
2694 struct in6_addr addr;
2695 struct inet6_dev *idev;
2699 if ((dev->type != ARPHRD_ETHER) &&
2700 (dev->type != ARPHRD_FDDI) &&
2701 (dev->type != ARPHRD_ARCNET) &&
2702 (dev->type != ARPHRD_INFINIBAND) &&
2703 (dev->type != ARPHRD_IEEE802154) &&
2704 (dev->type != ARPHRD_IEEE1394) &&
2705 (dev->type != ARPHRD_TUNNEL6) &&
2706 (dev->type != ARPHRD_6LOWPAN)) {
2707 /* Alas, we support only Ethernet autoconfiguration. */
2711 idev = addrconf_add_dev(dev);
2715 memset(&addr, 0, sizeof(struct in6_addr));
2716 addr.s6_addr32[0] = htonl(0xFE800000);
2718 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2719 addrconf_add_linklocal(idev, &addr);
2722 #if IS_ENABLED(CONFIG_IPV6_SIT)
2723 static void addrconf_sit_config(struct net_device *dev)
2725 struct inet6_dev *idev;
2730 * Configure the tunnel with one of our IPv4
2731 * addresses... we should configure all of
2732 * our v4 addrs in the tunnel
2735 if ((idev = ipv6_find_idev(dev)) == NULL) {
2736 pr_debug("%s: add_dev failed\n", __func__);
2740 if (dev->priv_flags & IFF_ISATAP) {
2741 struct in6_addr addr;
2743 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2744 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2745 addrconf_add_linklocal(idev, &addr);
2749 sit_add_v4_addrs(idev);
2751 if (dev->flags&IFF_POINTOPOINT)
2752 addrconf_add_mroute(dev);
2756 #if IS_ENABLED(CONFIG_NET_IPGRE)
2757 static void addrconf_gre_config(struct net_device *dev)
2759 struct inet6_dev *idev;
2760 struct in6_addr addr;
2764 if ((idev = ipv6_find_idev(dev)) == NULL) {
2765 pr_debug("%s: add_dev failed\n", __func__);
2769 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2770 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2771 addrconf_add_linklocal(idev, &addr);
2776 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2778 struct in6_addr lladdr;
2780 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2781 addrconf_add_linklocal(idev, &lladdr);
2787 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2790 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2791 struct inet6_dev *idev = __in6_dev_get(dev);
2792 int run_pending = 0;
2796 case NETDEV_REGISTER:
2797 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2798 idev = ipv6_add_dev(dev);
2800 return notifier_from_errno(-ENOMEM);
2806 if (dev->flags & IFF_SLAVE)
2809 if (event == NETDEV_UP) {
2810 if (!addrconf_qdisc_ok(dev)) {
2811 /* device is not ready yet. */
2812 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
2817 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2818 idev = ipv6_add_dev(dev);
2821 idev->if_flags |= IF_READY;
2825 if (!addrconf_qdisc_ok(dev)) {
2826 /* device is still not ready. */
2831 if (idev->if_flags & IF_READY)
2832 /* device is already configured. */
2834 idev->if_flags |= IF_READY;
2837 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
2843 switch (dev->type) {
2844 #if IS_ENABLED(CONFIG_IPV6_SIT)
2846 addrconf_sit_config(dev);
2849 #if IS_ENABLED(CONFIG_NET_IPGRE)
2851 addrconf_gre_config(dev);
2854 case ARPHRD_LOOPBACK:
2859 addrconf_dev_config(dev);
2865 addrconf_dad_run(idev);
2868 * If the MTU changed during the interface down,
2869 * when the interface up, the changed MTU must be
2870 * reflected in the idev as well as routers.
2872 if (idev->cnf.mtu6 != dev->mtu &&
2873 dev->mtu >= IPV6_MIN_MTU) {
2874 rt6_mtu_change(dev, dev->mtu);
2875 idev->cnf.mtu6 = dev->mtu;
2877 idev->tstamp = jiffies;
2878 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2881 * If the changed mtu during down is lower than
2882 * IPV6_MIN_MTU stop IPv6 on this interface.
2884 if (dev->mtu < IPV6_MIN_MTU)
2885 addrconf_ifdown(dev, 1);
2889 case NETDEV_CHANGEMTU:
2890 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2891 rt6_mtu_change(dev, dev->mtu);
2892 idev->cnf.mtu6 = dev->mtu;
2896 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2897 idev = ipv6_add_dev(dev);
2903 * if MTU under IPV6_MIN_MTU.
2904 * Stop IPv6 on this interface.
2908 case NETDEV_UNREGISTER:
2910 * Remove all addresses from this interface.
2912 addrconf_ifdown(dev, event != NETDEV_DOWN);
2915 case NETDEV_CHANGENAME:
2917 snmp6_unregister_dev(idev);
2918 addrconf_sysctl_unregister(idev);
2919 addrconf_sysctl_register(idev);
2920 err = snmp6_register_dev(idev);
2922 return notifier_from_errno(err);
2926 case NETDEV_PRE_TYPE_CHANGE:
2927 case NETDEV_POST_TYPE_CHANGE:
2928 addrconf_type_change(dev, event);
2936 * addrconf module should be notified of a device going up
2938 static struct notifier_block ipv6_dev_notf = {
2939 .notifier_call = addrconf_notify,
2942 static void addrconf_type_change(struct net_device *dev, unsigned long event)
2944 struct inet6_dev *idev;
2947 idev = __in6_dev_get(dev);
2949 if (event == NETDEV_POST_TYPE_CHANGE)
2950 ipv6_mc_remap(idev);
2951 else if (event == NETDEV_PRE_TYPE_CHANGE)
2952 ipv6_mc_unmap(idev);
2955 static int addrconf_ifdown(struct net_device *dev, int how)
2957 struct net *net = dev_net(dev);
2958 struct inet6_dev *idev;
2959 struct inet6_ifaddr *ifa;
2964 rt6_ifdown(net, dev);
2965 neigh_ifdown(&nd_tbl, dev);
2967 idev = __in6_dev_get(dev);
2972 * Step 1: remove reference to ipv6 device from parent device.
2978 /* protected by rtnl_lock */
2979 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
2981 /* Step 1.5: remove snmp6 entry */
2982 snmp6_unregister_dev(idev);
2986 /* Step 2: clear hash table */
2987 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
2988 struct hlist_head *h = &inet6_addr_lst[i];
2990 spin_lock_bh(&addrconf_hash_lock);
2992 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
2993 if (ifa->idev == idev) {
2994 hlist_del_init_rcu(&ifa->addr_lst);
2995 addrconf_del_dad_timer(ifa);
2999 spin_unlock_bh(&addrconf_hash_lock);
3002 write_lock_bh(&idev->lock);
3004 addrconf_del_rs_timer(idev);
3006 /* Step 2: clear flags for stateless addrconf */
3008 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3010 if (how && del_timer(&idev->regen_timer))
3013 /* Step 3: clear tempaddr list */
3014 while (!list_empty(&idev->tempaddr_list)) {
3015 ifa = list_first_entry(&idev->tempaddr_list,
3016 struct inet6_ifaddr, tmp_list);
3017 list_del(&ifa->tmp_list);
3018 write_unlock_bh(&idev->lock);
3019 spin_lock_bh(&ifa->lock);
3022 in6_ifa_put(ifa->ifpub);
3025 spin_unlock_bh(&ifa->lock);
3027 write_lock_bh(&idev->lock);
3030 while (!list_empty(&idev->addr_list)) {
3031 ifa = list_first_entry(&idev->addr_list,
3032 struct inet6_ifaddr, if_list);
3033 addrconf_del_dad_timer(ifa);
3035 list_del(&ifa->if_list);
3037 write_unlock_bh(&idev->lock);
3039 spin_lock_bh(&ifa->state_lock);
3041 ifa->state = INET6_IFADDR_STATE_DEAD;
3042 spin_unlock_bh(&ifa->state_lock);
3044 if (state != INET6_IFADDR_STATE_DEAD) {
3045 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3046 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3050 write_lock_bh(&idev->lock);
3053 write_unlock_bh(&idev->lock);
3055 /* Step 5: Discard multicast list */
3057 ipv6_mc_destroy_dev(idev);
3061 idev->tstamp = jiffies;
3063 /* Last: Shot the device (if unregistered) */
3065 addrconf_sysctl_unregister(idev);
3066 neigh_parms_release(&nd_tbl, idev->nd_parms);
3067 neigh_ifdown(&nd_tbl, dev);
3073 static void addrconf_rs_timer(unsigned long data)
3075 struct inet6_dev *idev = (struct inet6_dev *)data;
3076 struct net_device *dev = idev->dev;
3077 struct in6_addr lladdr;
3079 write_lock(&idev->lock);
3080 if (idev->dead || !(idev->if_flags & IF_READY))
3083 if (!ipv6_accept_ra(idev))
3086 /* Announcement received after solicitation was sent */
3087 if (idev->if_flags & IF_RA_RCVD)
3090 if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
3091 write_unlock(&idev->lock);
3092 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3093 ndisc_send_rs(dev, &lladdr,
3094 &in6addr_linklocal_allrouters);
3098 write_lock(&idev->lock);
3099 /* The wait after the last probe can be shorter */
3100 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3101 idev->cnf.rtr_solicits) ?
3102 idev->cnf.rtr_solicit_delay :
3103 idev->cnf.rtr_solicit_interval);
3106 * Note: we do not support deprecated "all on-link"
3107 * assumption any longer.
3109 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3113 write_unlock(&idev->lock);
3119 * Duplicate Address Detection
3121 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3123 unsigned long rand_num;
3124 struct inet6_dev *idev = ifp->idev;
3126 if (ifp->flags & IFA_F_OPTIMISTIC)
3129 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3131 ifp->dad_probes = idev->cnf.dad_transmits;
3132 addrconf_mod_dad_timer(ifp, rand_num);
3135 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3137 struct inet6_dev *idev = ifp->idev;
3138 struct net_device *dev = idev->dev;
3140 addrconf_join_solict(dev, &ifp->addr);
3142 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3144 read_lock_bh(&idev->lock);
3145 spin_lock(&ifp->lock);
3146 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3149 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3150 idev->cnf.accept_dad < 1 ||
3151 !(ifp->flags&IFA_F_TENTATIVE) ||
3152 ifp->flags & IFA_F_NODAD) {
3153 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3154 spin_unlock(&ifp->lock);
3155 read_unlock_bh(&idev->lock);
3157 addrconf_dad_completed(ifp);
3161 if (!(idev->if_flags & IF_READY)) {
3162 spin_unlock(&ifp->lock);
3163 read_unlock_bh(&idev->lock);
3165 * If the device is not ready:
3166 * - keep it tentative if it is a permanent address.
3167 * - otherwise, kill it.
3170 addrconf_dad_stop(ifp, 0);
3175 * Optimistic nodes can start receiving
3178 if (ifp->flags & IFA_F_OPTIMISTIC)
3179 ip6_ins_rt(ifp->rt);
3181 addrconf_dad_kick(ifp);
3183 spin_unlock(&ifp->lock);
3184 read_unlock_bh(&idev->lock);
3187 static void addrconf_dad_timer(unsigned long data)
3189 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
3190 struct inet6_dev *idev = ifp->idev;
3191 struct in6_addr mcaddr;
3193 if (!ifp->dad_probes && addrconf_dad_end(ifp))
3196 write_lock(&idev->lock);
3197 if (idev->dead || !(idev->if_flags & IF_READY)) {
3198 write_unlock(&idev->lock);
3202 spin_lock(&ifp->lock);
3203 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3204 spin_unlock(&ifp->lock);
3205 write_unlock(&idev->lock);
3209 if (ifp->dad_probes == 0) {
3211 * DAD was successful
3214 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3215 spin_unlock(&ifp->lock);
3216 write_unlock(&idev->lock);
3218 addrconf_dad_completed(ifp);
3224 addrconf_mod_dad_timer(ifp,
3225 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
3226 spin_unlock(&ifp->lock);
3227 write_unlock(&idev->lock);
3229 /* send a neighbour solicitation for our addr */
3230 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3231 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
3236 /* ifp->idev must be at least read locked */
3237 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3239 struct inet6_ifaddr *ifpiter;
3240 struct inet6_dev *idev = ifp->idev;
3242 list_for_each_entry(ifpiter, &idev->addr_list, if_list) {
3243 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3244 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3245 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3252 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3254 struct net_device *dev = ifp->idev->dev;
3255 struct in6_addr lladdr;
3256 bool send_rs, send_mld;
3258 addrconf_del_dad_timer(ifp);
3261 * Configure the address for reception. Now it is valid.
3264 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3266 /* If added prefix is link local and we are prepared to process
3267 router advertisements, start sending router solicitations.
3270 read_lock_bh(&ifp->idev->lock);
3271 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
3272 send_rs = send_mld &&
3273 ipv6_accept_ra(ifp->idev) &&
3274 ifp->idev->cnf.rtr_solicits > 0 &&
3275 (dev->flags&IFF_LOOPBACK) == 0;
3276 read_unlock_bh(&ifp->idev->lock);
3278 /* While dad is in progress mld report's source address is in6_addrany.
3279 * Resend with proper ll now.
3282 ipv6_mc_dad_complete(ifp->idev);
3286 * If a host as already performed a random delay
3287 * [...] as part of DAD [...] there is no need
3288 * to delay again before sending the first RS
3290 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3292 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
3294 write_lock_bh(&ifp->idev->lock);
3295 spin_lock(&ifp->lock);
3296 ifp->idev->rs_probes = 1;
3297 ifp->idev->if_flags |= IF_RS_SENT;
3298 addrconf_mod_rs_timer(ifp->idev,
3299 ifp->idev->cnf.rtr_solicit_interval);
3300 spin_unlock(&ifp->lock);
3301 write_unlock_bh(&ifp->idev->lock);
3305 static void addrconf_dad_run(struct inet6_dev *idev)
3307 struct inet6_ifaddr *ifp;
3309 read_lock_bh(&idev->lock);
3310 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3311 spin_lock(&ifp->lock);
3312 if (ifp->flags & IFA_F_TENTATIVE &&
3313 ifp->state == INET6_IFADDR_STATE_DAD)
3314 addrconf_dad_kick(ifp);
3315 spin_unlock(&ifp->lock);
3317 read_unlock_bh(&idev->lock);
3320 #ifdef CONFIG_PROC_FS
3321 struct if6_iter_state {
3322 struct seq_net_private p;
3327 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3329 struct inet6_ifaddr *ifa = NULL;
3330 struct if6_iter_state *state = seq->private;
3331 struct net *net = seq_file_net(seq);
3334 /* initial bucket if pos is 0 */
3340 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3341 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
3343 if (!net_eq(dev_net(ifa->idev->dev), net))
3345 /* sync with offset */
3346 if (p < state->offset) {
3354 /* prepare for next bucket */
3361 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3362 struct inet6_ifaddr *ifa)
3364 struct if6_iter_state *state = seq->private;
3365 struct net *net = seq_file_net(seq);
3367 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
3368 if (!net_eq(dev_net(ifa->idev->dev), net))
3374 while (++state->bucket < IN6_ADDR_HSIZE) {
3376 hlist_for_each_entry_rcu_bh(ifa,
3377 &inet6_addr_lst[state->bucket], addr_lst) {
3378 if (!net_eq(dev_net(ifa->idev->dev), net))
3388 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3392 return if6_get_first(seq, *pos);
3395 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3397 struct inet6_ifaddr *ifa;
3399 ifa = if6_get_next(seq, v);
3404 static void if6_seq_stop(struct seq_file *seq, void *v)
3407 rcu_read_unlock_bh();
3410 static int if6_seq_show(struct seq_file *seq, void *v)
3412 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3413 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3415 ifp->idev->dev->ifindex,
3419 ifp->idev->dev->name);
3423 static const struct seq_operations if6_seq_ops = {
3424 .start = if6_seq_start,
3425 .next = if6_seq_next,
3426 .show = if6_seq_show,
3427 .stop = if6_seq_stop,
3430 static int if6_seq_open(struct inode *inode, struct file *file)
3432 return seq_open_net(inode, file, &if6_seq_ops,
3433 sizeof(struct if6_iter_state));
3436 static const struct file_operations if6_fops = {
3437 .owner = THIS_MODULE,
3438 .open = if6_seq_open,
3440 .llseek = seq_lseek,
3441 .release = seq_release_net,
3444 static int __net_init if6_proc_net_init(struct net *net)
3446 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
3451 static void __net_exit if6_proc_net_exit(struct net *net)
3453 remove_proc_entry("if_inet6", net->proc_net);
3456 static struct pernet_operations if6_proc_net_ops = {
3457 .init = if6_proc_net_init,
3458 .exit = if6_proc_net_exit,
3461 int __init if6_proc_init(void)
3463 return register_pernet_subsys(&if6_proc_net_ops);
3466 void if6_proc_exit(void)
3468 unregister_pernet_subsys(&if6_proc_net_ops);
3470 #endif /* CONFIG_PROC_FS */
3472 #if IS_ENABLED(CONFIG_IPV6_MIP6)
3473 /* Check if address is a home address configured on any interface. */
3474 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3477 struct inet6_ifaddr *ifp = NULL;
3478 unsigned int hash = inet6_addr_hash(addr);
3481 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
3482 if (!net_eq(dev_net(ifp->idev->dev), net))
3484 if (ipv6_addr_equal(&ifp->addr, addr) &&
3485 (ifp->flags & IFA_F_HOMEADDRESS)) {
3490 rcu_read_unlock_bh();
3496 * Periodic address status verification
3499 static void addrconf_verify(unsigned long foo)
3501 unsigned long now, next, next_sec, next_sched;
3502 struct inet6_ifaddr *ifp;
3506 spin_lock(&addrconf_verify_lock);
3508 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3510 del_timer(&addr_chk_timer);
3512 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3514 hlist_for_each_entry_rcu_bh(ifp,
3515 &inet6_addr_lst[i], addr_lst) {
3518 /* When setting preferred_lft to a value not zero or
3519 * infinity, while valid_lft is infinity
3520 * IFA_F_PERMANENT has a non-infinity life time.
3522 if ((ifp->flags & IFA_F_PERMANENT) &&
3523 (ifp->prefered_lft == INFINITY_LIFE_TIME))
3526 spin_lock(&ifp->lock);
3527 /* We try to batch several events at once. */
3528 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3530 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3531 age >= ifp->valid_lft) {
3532 spin_unlock(&ifp->lock);
3536 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3537 spin_unlock(&ifp->lock);
3539 } else if (age >= ifp->prefered_lft) {
3540 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3543 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3545 ifp->flags |= IFA_F_DEPRECATED;
3548 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
3549 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
3550 next = ifp->tstamp + ifp->valid_lft * HZ;
3552 spin_unlock(&ifp->lock);
3557 ipv6_ifa_notify(0, ifp);
3561 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3562 !(ifp->flags&IFA_F_TENTATIVE)) {
3563 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3564 ifp->idev->cnf.dad_transmits *
3565 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
3567 if (age >= ifp->prefered_lft - regen_advance) {
3568 struct inet6_ifaddr *ifpub = ifp->ifpub;
3569 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3570 next = ifp->tstamp + ifp->prefered_lft * HZ;
3571 if (!ifp->regen_count && ifpub) {
3574 in6_ifa_hold(ifpub);
3575 spin_unlock(&ifp->lock);
3577 spin_lock(&ifpub->lock);
3578 ifpub->regen_count = 0;
3579 spin_unlock(&ifpub->lock);
3580 ipv6_create_tempaddr(ifpub, ifp);
3585 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3586 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3587 spin_unlock(&ifp->lock);
3589 /* ifp->prefered_lft <= ifp->valid_lft */
3590 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3591 next = ifp->tstamp + ifp->prefered_lft * HZ;
3592 spin_unlock(&ifp->lock);
3597 next_sec = round_jiffies_up(next);
3600 /* If rounded timeout is accurate enough, accept it. */
3601 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3602 next_sched = next_sec;
3604 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3605 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3606 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3608 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3609 now, next, next_sec, next_sched);
3611 addr_chk_timer.expires = next_sched;
3612 add_timer(&addr_chk_timer);
3613 spin_unlock(&addrconf_verify_lock);
3614 rcu_read_unlock_bh();
3617 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
3618 struct in6_addr **peer_pfx)
3620 struct in6_addr *pfx = NULL;
3625 pfx = nla_data(addr);
3628 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3630 pfx = nla_data(local);
3636 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3637 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3638 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3639 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3640 [IFA_FLAGS] = { .len = sizeof(u32) },
3644 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
3646 struct net *net = sock_net(skb->sk);
3647 struct ifaddrmsg *ifm;
3648 struct nlattr *tb[IFA_MAX+1];
3649 struct in6_addr *pfx, *peer_pfx;
3652 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3656 ifm = nlmsg_data(nlh);
3657 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
3661 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3664 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
3665 u32 prefered_lft, u32 valid_lft)
3669 unsigned long timeout;
3670 bool was_managetempaddr;
3671 bool had_prefixroute;
3673 if (!valid_lft || (prefered_lft > valid_lft))
3676 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
3677 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
3680 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3681 if (addrconf_finite_timeout(timeout)) {
3682 expires = jiffies_to_clock_t(timeout * HZ);
3683 valid_lft = timeout;
3684 flags = RTF_EXPIRES;
3688 ifa_flags |= IFA_F_PERMANENT;
3691 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3692 if (addrconf_finite_timeout(timeout)) {
3694 ifa_flags |= IFA_F_DEPRECATED;
3695 prefered_lft = timeout;
3698 spin_lock_bh(&ifp->lock);
3699 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
3700 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
3701 !(ifp->flags & IFA_F_NOPREFIXROUTE);
3702 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
3703 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
3704 IFA_F_NOPREFIXROUTE);
3705 ifp->flags |= ifa_flags;
3706 ifp->tstamp = jiffies;
3707 ifp->valid_lft = valid_lft;
3708 ifp->prefered_lft = prefered_lft;
3710 spin_unlock_bh(&ifp->lock);
3711 if (!(ifp->flags&IFA_F_TENTATIVE))
3712 ipv6_ifa_notify(0, ifp);
3714 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
3715 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3717 } else if (had_prefixroute) {
3718 enum cleanup_prefix_rt_t action;
3719 unsigned long rt_expires;
3721 write_lock_bh(&ifp->idev->lock);
3722 action = check_cleanup_prefix_route(ifp, &rt_expires);
3723 write_unlock_bh(&ifp->idev->lock);
3725 if (action != CLEANUP_PREFIX_RT_NOP) {
3726 cleanup_prefix_route(ifp, rt_expires,
3727 action == CLEANUP_PREFIX_RT_DEL);
3731 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
3732 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
3733 valid_lft = prefered_lft = 0;
3734 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
3735 !was_managetempaddr, jiffies);
3744 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
3746 struct net *net = sock_net(skb->sk);
3747 struct ifaddrmsg *ifm;
3748 struct nlattr *tb[IFA_MAX+1];
3749 struct in6_addr *pfx, *peer_pfx;
3750 struct inet6_ifaddr *ifa;
3751 struct net_device *dev;
3752 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3756 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3760 ifm = nlmsg_data(nlh);
3761 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
3765 if (tb[IFA_CACHEINFO]) {
3766 struct ifa_cacheinfo *ci;
3768 ci = nla_data(tb[IFA_CACHEINFO]);
3769 valid_lft = ci->ifa_valid;
3770 preferred_lft = ci->ifa_prefered;
3772 preferred_lft = INFINITY_LIFE_TIME;
3773 valid_lft = INFINITY_LIFE_TIME;
3776 dev = __dev_get_by_index(net, ifm->ifa_index);
3780 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
3782 /* We ignore other flags so far. */
3783 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
3784 IFA_F_NOPREFIXROUTE;
3786 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3789 * It would be best to check for !NLM_F_CREATE here but
3790 * userspace already relies on not having to provide this.
3792 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
3793 ifm->ifa_prefixlen, ifa_flags,
3794 preferred_lft, valid_lft);
3797 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3798 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3801 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3808 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
3809 u8 scope, int ifindex)
3811 struct ifaddrmsg *ifm;
3813 ifm = nlmsg_data(nlh);
3814 ifm->ifa_family = AF_INET6;
3815 ifm->ifa_prefixlen = prefixlen;
3816 ifm->ifa_flags = flags;
3817 ifm->ifa_scope = scope;
3818 ifm->ifa_index = ifindex;
3821 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3822 unsigned long tstamp, u32 preferred, u32 valid)
3824 struct ifa_cacheinfo ci;
3826 ci.cstamp = cstamp_delta(cstamp);
3827 ci.tstamp = cstamp_delta(tstamp);
3828 ci.ifa_prefered = preferred;
3829 ci.ifa_valid = valid;
3831 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3834 static inline int rt_scope(int ifa_scope)
3836 if (ifa_scope & IFA_HOST)
3837 return RT_SCOPE_HOST;
3838 else if (ifa_scope & IFA_LINK)
3839 return RT_SCOPE_LINK;
3840 else if (ifa_scope & IFA_SITE)
3841 return RT_SCOPE_SITE;
3843 return RT_SCOPE_UNIVERSE;
3846 static inline int inet6_ifaddr_msgsize(void)
3848 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3849 + nla_total_size(16) /* IFA_LOCAL */
3850 + nla_total_size(16) /* IFA_ADDRESS */
3851 + nla_total_size(sizeof(struct ifa_cacheinfo))
3852 + nla_total_size(4) /* IFA_FLAGS */;
3855 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3856 u32 portid, u32 seq, int event, unsigned int flags)
3858 struct nlmsghdr *nlh;
3859 u32 preferred, valid;
3861 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3865 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3866 ifa->idev->dev->ifindex);
3868 if (!((ifa->flags&IFA_F_PERMANENT) &&
3869 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
3870 preferred = ifa->prefered_lft;
3871 valid = ifa->valid_lft;
3872 if (preferred != INFINITY_LIFE_TIME) {
3873 long tval = (jiffies - ifa->tstamp)/HZ;
3874 if (preferred > tval)
3878 if (valid != INFINITY_LIFE_TIME) {
3886 preferred = INFINITY_LIFE_TIME;
3887 valid = INFINITY_LIFE_TIME;
3890 if (!ipv6_addr_any(&ifa->peer_addr)) {
3891 if (nla_put(skb, IFA_LOCAL, 16, &ifa->addr) < 0 ||
3892 nla_put(skb, IFA_ADDRESS, 16, &ifa->peer_addr) < 0)
3895 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0)
3898 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
3901 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
3904 return nlmsg_end(skb, nlh);
3907 nlmsg_cancel(skb, nlh);
3911 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3912 u32 portid, u32 seq, int event, u16 flags)
3914 struct nlmsghdr *nlh;
3915 u8 scope = RT_SCOPE_UNIVERSE;
3916 int ifindex = ifmca->idev->dev->ifindex;
3918 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3919 scope = RT_SCOPE_SITE;
3921 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3925 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3926 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3927 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3928 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3929 nlmsg_cancel(skb, nlh);
3933 return nlmsg_end(skb, nlh);
3936 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3937 u32 portid, u32 seq, int event, unsigned int flags)
3939 struct nlmsghdr *nlh;
3940 u8 scope = RT_SCOPE_UNIVERSE;
3941 int ifindex = ifaca->aca_idev->dev->ifindex;
3943 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3944 scope = RT_SCOPE_SITE;
3946 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3950 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3951 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3952 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3953 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3954 nlmsg_cancel(skb, nlh);
3958 return nlmsg_end(skb, nlh);
3967 /* called with rcu_read_lock() */
3968 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3969 struct netlink_callback *cb, enum addr_type_t type,
3970 int s_ip_idx, int *p_ip_idx)
3972 struct ifmcaddr6 *ifmca;
3973 struct ifacaddr6 *ifaca;
3975 int ip_idx = *p_ip_idx;
3977 read_lock_bh(&idev->lock);
3979 case UNICAST_ADDR: {
3980 struct inet6_ifaddr *ifa;
3982 /* unicast address incl. temp addr */
3983 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3984 if (++ip_idx < s_ip_idx)
3986 err = inet6_fill_ifaddr(skb, ifa,
3987 NETLINK_CB(cb->skb).portid,
3993 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3997 case MULTICAST_ADDR:
3998 /* multicast address */
3999 for (ifmca = idev->mc_list; ifmca;
4000 ifmca = ifmca->next, ip_idx++) {
4001 if (ip_idx < s_ip_idx)
4003 err = inet6_fill_ifmcaddr(skb, ifmca,
4004 NETLINK_CB(cb->skb).portid,
4013 /* anycast address */
4014 for (ifaca = idev->ac_list; ifaca;
4015 ifaca = ifaca->aca_next, ip_idx++) {
4016 if (ip_idx < s_ip_idx)
4018 err = inet6_fill_ifacaddr(skb, ifaca,
4019 NETLINK_CB(cb->skb).portid,
4030 read_unlock_bh(&idev->lock);
4035 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4036 enum addr_type_t type)
4038 struct net *net = sock_net(skb->sk);
4041 int s_idx, s_ip_idx;
4042 struct net_device *dev;
4043 struct inet6_dev *idev;
4044 struct hlist_head *head;
4047 s_idx = idx = cb->args[1];
4048 s_ip_idx = ip_idx = cb->args[2];
4051 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4052 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4054 head = &net->dev_index_head[h];
4055 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4058 if (h > s_h || idx > s_idx)
4061 idev = __in6_dev_get(dev);
4065 if (in6_dump_addrs(idev, skb, cb, type,
4066 s_ip_idx, &ip_idx) <= 0)
4076 cb->args[2] = ip_idx;
4081 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4083 enum addr_type_t type = UNICAST_ADDR;
4085 return inet6_dump_addr(skb, cb, type);
4088 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4090 enum addr_type_t type = MULTICAST_ADDR;
4092 return inet6_dump_addr(skb, cb, type);
4096 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4098 enum addr_type_t type = ANYCAST_ADDR;
4100 return inet6_dump_addr(skb, cb, type);
4103 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
4105 struct net *net = sock_net(in_skb->sk);
4106 struct ifaddrmsg *ifm;
4107 struct nlattr *tb[IFA_MAX+1];
4108 struct in6_addr *addr = NULL, *peer;
4109 struct net_device *dev = NULL;
4110 struct inet6_ifaddr *ifa;
4111 struct sk_buff *skb;
4114 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4118 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4124 ifm = nlmsg_data(nlh);
4126 dev = __dev_get_by_index(net, ifm->ifa_index);
4128 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4130 err = -EADDRNOTAVAIL;
4134 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4140 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4141 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4143 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4144 WARN_ON(err == -EMSGSIZE);
4148 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4155 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4157 struct sk_buff *skb;
4158 struct net *net = dev_net(ifa->idev->dev);
4161 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4165 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4167 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4168 WARN_ON(err == -EMSGSIZE);
4172 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4176 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4179 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4180 __s32 *array, int bytes)
4182 BUG_ON(bytes < (DEVCONF_MAX * 4));
4184 memset(array, 0, bytes);
4185 array[DEVCONF_FORWARDING] = cnf->forwarding;
4186 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4187 array[DEVCONF_MTU6] = cnf->mtu6;
4188 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4189 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4190 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4191 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4192 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4193 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4194 jiffies_to_msecs(cnf->rtr_solicit_interval);
4195 array[DEVCONF_RTR_SOLICIT_DELAY] =
4196 jiffies_to_msecs(cnf->rtr_solicit_delay);
4197 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4198 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4199 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4200 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4201 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
4202 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4203 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4204 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4205 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4206 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4207 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4208 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4209 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4210 #ifdef CONFIG_IPV6_ROUTER_PREF
4211 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4212 array[DEVCONF_RTR_PROBE_INTERVAL] =
4213 jiffies_to_msecs(cnf->rtr_probe_interval);
4214 #ifdef CONFIG_IPV6_ROUTE_INFO
4215 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4218 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4219 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4220 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4221 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4223 #ifdef CONFIG_IPV6_MROUTE
4224 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4226 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4227 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4228 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4229 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4230 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
4233 static inline size_t inet6_ifla6_size(void)
4235 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4236 + nla_total_size(sizeof(struct ifla_cacheinfo))
4237 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4238 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4239 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4240 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
4243 static inline size_t inet6_if_nlmsg_size(void)
4245 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4246 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4247 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4248 + nla_total_size(4) /* IFLA_MTU */
4249 + nla_total_size(4) /* IFLA_LINK */
4250 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4253 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4254 int items, int bytes)
4257 int pad = bytes - sizeof(u64) * items;
4260 /* Use put_unaligned() because stats may not be aligned for u64. */
4261 put_unaligned(items, &stats[0]);
4262 for (i = 1; i < items; i++)
4263 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4265 memset(&stats[items], 0, pad);
4268 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
4269 int items, int bytes, size_t syncpoff)
4272 int pad = bytes - sizeof(u64) * items;
4275 /* Use put_unaligned() because stats may not be aligned for u64. */
4276 put_unaligned(items, &stats[0]);
4277 for (i = 1; i < items; i++)
4278 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4280 memset(&stats[items], 0, pad);
4283 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4287 case IFLA_INET6_STATS:
4288 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
4289 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
4291 case IFLA_INET6_ICMP6STATS:
4292 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
4297 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4300 struct ifla_cacheinfo ci;
4302 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4303 goto nla_put_failure;
4304 ci.max_reasm_len = IPV6_MAXPLEN;
4305 ci.tstamp = cstamp_delta(idev->tstamp);
4306 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4307 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
4308 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4309 goto nla_put_failure;
4310 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4312 goto nla_put_failure;
4313 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4315 /* XXX - MC not implemented */
4317 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4319 goto nla_put_failure;
4320 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4322 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4324 goto nla_put_failure;
4325 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4327 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4329 goto nla_put_failure;
4330 read_lock_bh(&idev->lock);
4331 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4332 read_unlock_bh(&idev->lock);
4340 static size_t inet6_get_link_af_size(const struct net_device *dev)
4342 if (!__in6_dev_get(dev))
4345 return inet6_ifla6_size();
4348 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4350 struct inet6_dev *idev = __in6_dev_get(dev);
4355 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4361 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4363 struct inet6_ifaddr *ifp;
4364 struct net_device *dev = idev->dev;
4365 bool update_rs = false;
4366 struct in6_addr ll_addr;
4370 if (ipv6_addr_any(token))
4372 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4374 if (!ipv6_accept_ra(idev))
4376 if (idev->cnf.rtr_solicits <= 0)
4379 write_lock_bh(&idev->lock);
4381 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4382 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4384 write_unlock_bh(&idev->lock);
4386 if (!idev->dead && (idev->if_flags & IF_READY) &&
4387 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4388 IFA_F_OPTIMISTIC)) {
4390 /* If we're not ready, then normal ifup will take care
4391 * of this. Otherwise, we need to request our rs here.
4393 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4397 write_lock_bh(&idev->lock);
4400 idev->if_flags |= IF_RS_SENT;
4401 idev->rs_probes = 1;
4402 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
4405 /* Well, that's kinda nasty ... */
4406 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4407 spin_lock(&ifp->lock);
4408 if (ifp->tokenized) {
4410 ifp->prefered_lft = 0;
4412 spin_unlock(&ifp->lock);
4415 write_unlock_bh(&idev->lock);
4420 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4423 struct inet6_dev *idev = __in6_dev_get(dev);
4424 struct nlattr *tb[IFLA_INET6_MAX + 1];
4427 return -EAFNOSUPPORT;
4429 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4432 if (tb[IFLA_INET6_TOKEN])
4433 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
4438 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4439 u32 portid, u32 seq, int event, unsigned int flags)
4441 struct net_device *dev = idev->dev;
4442 struct ifinfomsg *hdr;
4443 struct nlmsghdr *nlh;
4446 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
4450 hdr = nlmsg_data(nlh);
4451 hdr->ifi_family = AF_INET6;
4453 hdr->ifi_type = dev->type;
4454 hdr->ifi_index = dev->ifindex;
4455 hdr->ifi_flags = dev_get_flags(dev);
4456 hdr->ifi_change = 0;
4458 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4460 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4461 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4462 (dev->ifindex != dev->iflink &&
4463 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4464 goto nla_put_failure;
4465 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4466 if (protoinfo == NULL)
4467 goto nla_put_failure;
4469 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4470 goto nla_put_failure;
4472 nla_nest_end(skb, protoinfo);
4473 return nlmsg_end(skb, nlh);
4476 nlmsg_cancel(skb, nlh);
4480 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4482 struct net *net = sock_net(skb->sk);
4485 struct net_device *dev;
4486 struct inet6_dev *idev;
4487 struct hlist_head *head;
4490 s_idx = cb->args[1];
4493 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4495 head = &net->dev_index_head[h];
4496 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4499 idev = __in6_dev_get(dev);
4502 if (inet6_fill_ifinfo(skb, idev,
4503 NETLINK_CB(cb->skb).portid,
4505 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4519 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4521 struct sk_buff *skb;
4522 struct net *net = dev_net(idev->dev);
4525 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4529 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4531 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4532 WARN_ON(err == -EMSGSIZE);
4536 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4540 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4543 static inline size_t inet6_prefix_nlmsg_size(void)
4545 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4546 + nla_total_size(sizeof(struct in6_addr))
4547 + nla_total_size(sizeof(struct prefix_cacheinfo));
4550 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4551 struct prefix_info *pinfo, u32 portid, u32 seq,
4552 int event, unsigned int flags)
4554 struct prefixmsg *pmsg;
4555 struct nlmsghdr *nlh;
4556 struct prefix_cacheinfo ci;
4558 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
4562 pmsg = nlmsg_data(nlh);
4563 pmsg->prefix_family = AF_INET6;
4564 pmsg->prefix_pad1 = 0;
4565 pmsg->prefix_pad2 = 0;
4566 pmsg->prefix_ifindex = idev->dev->ifindex;
4567 pmsg->prefix_len = pinfo->prefix_len;
4568 pmsg->prefix_type = pinfo->type;
4569 pmsg->prefix_pad3 = 0;
4570 pmsg->prefix_flags = 0;
4572 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4573 if (pinfo->autoconf)
4574 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4576 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4577 goto nla_put_failure;
4578 ci.preferred_time = ntohl(pinfo->prefered);
4579 ci.valid_time = ntohl(pinfo->valid);
4580 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4581 goto nla_put_failure;
4582 return nlmsg_end(skb, nlh);
4585 nlmsg_cancel(skb, nlh);
4589 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4590 struct prefix_info *pinfo)
4592 struct sk_buff *skb;
4593 struct net *net = dev_net(idev->dev);
4596 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4600 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4602 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4603 WARN_ON(err == -EMSGSIZE);
4607 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4611 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4614 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4616 struct net *net = dev_net(ifp->idev->dev);
4618 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4623 * If the address was optimistic
4624 * we inserted the route at the start of
4625 * our DAD process, so we don't need
4628 if (!(ifp->rt->rt6i_node))
4629 ip6_ins_rt(ifp->rt);
4630 if (ifp->idev->cnf.forwarding)
4631 addrconf_join_anycast(ifp);
4632 if (!ipv6_addr_any(&ifp->peer_addr))
4633 addrconf_prefix_route(&ifp->peer_addr, 128,
4634 ifp->idev->dev, 0, 0);
4637 if (ifp->idev->cnf.forwarding)
4638 addrconf_leave_anycast(ifp);
4639 addrconf_leave_solict(ifp->idev, &ifp->addr);
4640 if (!ipv6_addr_any(&ifp->peer_addr)) {
4641 struct rt6_info *rt;
4642 struct net_device *dev = ifp->idev->dev;
4644 rt = rt6_lookup(dev_net(dev), &ifp->peer_addr, NULL,
4652 dst_hold(&ifp->rt->dst);
4654 if (ip6_del_rt(ifp->rt))
4655 dst_free(&ifp->rt->dst);
4658 atomic_inc(&net->ipv6.dev_addr_genid);
4659 rt_genid_bump_ipv6(net);
4662 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4665 if (likely(ifp->idev->dead == 0))
4666 __ipv6_ifa_notify(event, ifp);
4667 rcu_read_unlock_bh();
4670 #ifdef CONFIG_SYSCTL
4673 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
4674 void __user *buffer, size_t *lenp, loff_t *ppos)
4676 int *valp = ctl->data;
4679 struct ctl_table lctl;
4683 * ctl->data points to idev->cnf.forwarding, we should
4684 * not modify it until we get the rtnl lock.
4689 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4692 ret = addrconf_fixup_forwarding(ctl, valp, val);
4698 static void dev_disable_change(struct inet6_dev *idev)
4700 struct netdev_notifier_info info;
4702 if (!idev || !idev->dev)
4705 netdev_notifier_info_init(&info, idev->dev);
4706 if (idev->cnf.disable_ipv6)
4707 addrconf_notify(NULL, NETDEV_DOWN, &info);
4709 addrconf_notify(NULL, NETDEV_UP, &info);
4712 static void addrconf_disable_change(struct net *net, __s32 newf)
4714 struct net_device *dev;
4715 struct inet6_dev *idev;
4718 for_each_netdev_rcu(net, dev) {
4719 idev = __in6_dev_get(dev);
4721 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4722 idev->cnf.disable_ipv6 = newf;
4724 dev_disable_change(idev);
4730 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
4735 if (!rtnl_trylock())
4736 return restart_syscall();
4738 net = (struct net *)table->extra2;
4742 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4747 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4748 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4749 addrconf_disable_change(net, newf);
4750 } else if ((!newf) ^ (!old))
4751 dev_disable_change((struct inet6_dev *)table->extra1);
4758 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
4759 void __user *buffer, size_t *lenp, loff_t *ppos)
4761 int *valp = ctl->data;
4764 struct ctl_table lctl;
4768 * ctl->data points to idev->cnf.disable_ipv6, we should
4769 * not modify it until we get the rtnl lock.
4774 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4777 ret = addrconf_disable_ipv6(ctl, valp, val);
4784 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
4785 void __user *buffer, size_t *lenp, loff_t *ppos)
4787 int *valp = ctl->data;
4792 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4795 if (write && old != new) {
4796 struct net *net = ctl->extra2;
4798 if (!rtnl_trylock())
4799 return restart_syscall();
4801 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
4802 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
4803 NETCONFA_IFINDEX_DEFAULT,
4804 net->ipv6.devconf_dflt);
4805 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
4806 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
4807 NETCONFA_IFINDEX_ALL,
4808 net->ipv6.devconf_all);
4810 struct inet6_dev *idev = ctl->extra1;
4812 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
4823 static struct addrconf_sysctl_table
4825 struct ctl_table_header *sysctl_header;
4826 struct ctl_table addrconf_vars[DEVCONF_MAX+1];
4827 } addrconf_sysctl __read_mostly = {
4828 .sysctl_header = NULL,
4831 .procname = "forwarding",
4832 .data = &ipv6_devconf.forwarding,
4833 .maxlen = sizeof(int),
4835 .proc_handler = addrconf_sysctl_forward,
4838 .procname = "hop_limit",
4839 .data = &ipv6_devconf.hop_limit,
4840 .maxlen = sizeof(int),
4842 .proc_handler = proc_dointvec,
4846 .data = &ipv6_devconf.mtu6,
4847 .maxlen = sizeof(int),
4849 .proc_handler = proc_dointvec,
4852 .procname = "accept_ra",
4853 .data = &ipv6_devconf.accept_ra,
4854 .maxlen = sizeof(int),
4856 .proc_handler = proc_dointvec,
4859 .procname = "accept_redirects",
4860 .data = &ipv6_devconf.accept_redirects,
4861 .maxlen = sizeof(int),
4863 .proc_handler = proc_dointvec,
4866 .procname = "autoconf",
4867 .data = &ipv6_devconf.autoconf,
4868 .maxlen = sizeof(int),
4870 .proc_handler = proc_dointvec,
4873 .procname = "dad_transmits",
4874 .data = &ipv6_devconf.dad_transmits,
4875 .maxlen = sizeof(int),
4877 .proc_handler = proc_dointvec,
4880 .procname = "router_solicitations",
4881 .data = &ipv6_devconf.rtr_solicits,
4882 .maxlen = sizeof(int),
4884 .proc_handler = proc_dointvec,
4887 .procname = "router_solicitation_interval",
4888 .data = &ipv6_devconf.rtr_solicit_interval,
4889 .maxlen = sizeof(int),
4891 .proc_handler = proc_dointvec_jiffies,
4894 .procname = "router_solicitation_delay",
4895 .data = &ipv6_devconf.rtr_solicit_delay,
4896 .maxlen = sizeof(int),
4898 .proc_handler = proc_dointvec_jiffies,
4901 .procname = "force_mld_version",
4902 .data = &ipv6_devconf.force_mld_version,
4903 .maxlen = sizeof(int),
4905 .proc_handler = proc_dointvec,
4908 .procname = "mldv1_unsolicited_report_interval",
4910 &ipv6_devconf.mldv1_unsolicited_report_interval,
4911 .maxlen = sizeof(int),
4913 .proc_handler = proc_dointvec_ms_jiffies,
4916 .procname = "mldv2_unsolicited_report_interval",
4918 &ipv6_devconf.mldv2_unsolicited_report_interval,
4919 .maxlen = sizeof(int),
4921 .proc_handler = proc_dointvec_ms_jiffies,
4924 .procname = "use_tempaddr",
4925 .data = &ipv6_devconf.use_tempaddr,
4926 .maxlen = sizeof(int),
4928 .proc_handler = proc_dointvec,
4931 .procname = "temp_valid_lft",
4932 .data = &ipv6_devconf.temp_valid_lft,
4933 .maxlen = sizeof(int),
4935 .proc_handler = proc_dointvec,
4938 .procname = "temp_prefered_lft",
4939 .data = &ipv6_devconf.temp_prefered_lft,
4940 .maxlen = sizeof(int),
4942 .proc_handler = proc_dointvec,
4945 .procname = "regen_max_retry",
4946 .data = &ipv6_devconf.regen_max_retry,
4947 .maxlen = sizeof(int),
4949 .proc_handler = proc_dointvec,
4952 .procname = "max_desync_factor",
4953 .data = &ipv6_devconf.max_desync_factor,
4954 .maxlen = sizeof(int),
4956 .proc_handler = proc_dointvec,
4959 .procname = "max_addresses",
4960 .data = &ipv6_devconf.max_addresses,
4961 .maxlen = sizeof(int),
4963 .proc_handler = proc_dointvec,
4966 .procname = "accept_ra_defrtr",
4967 .data = &ipv6_devconf.accept_ra_defrtr,
4968 .maxlen = sizeof(int),
4970 .proc_handler = proc_dointvec,
4973 .procname = "accept_ra_pinfo",
4974 .data = &ipv6_devconf.accept_ra_pinfo,
4975 .maxlen = sizeof(int),
4977 .proc_handler = proc_dointvec,
4979 #ifdef CONFIG_IPV6_ROUTER_PREF
4981 .procname = "accept_ra_rtr_pref",
4982 .data = &ipv6_devconf.accept_ra_rtr_pref,
4983 .maxlen = sizeof(int),
4985 .proc_handler = proc_dointvec,
4988 .procname = "router_probe_interval",
4989 .data = &ipv6_devconf.rtr_probe_interval,
4990 .maxlen = sizeof(int),
4992 .proc_handler = proc_dointvec_jiffies,
4994 #ifdef CONFIG_IPV6_ROUTE_INFO
4996 .procname = "accept_ra_rt_info_max_plen",
4997 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4998 .maxlen = sizeof(int),
5000 .proc_handler = proc_dointvec,
5005 .procname = "proxy_ndp",
5006 .data = &ipv6_devconf.proxy_ndp,
5007 .maxlen = sizeof(int),
5009 .proc_handler = addrconf_sysctl_proxy_ndp,
5012 .procname = "accept_source_route",
5013 .data = &ipv6_devconf.accept_source_route,
5014 .maxlen = sizeof(int),
5016 .proc_handler = proc_dointvec,
5018 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5020 .procname = "optimistic_dad",
5021 .data = &ipv6_devconf.optimistic_dad,
5022 .maxlen = sizeof(int),
5024 .proc_handler = proc_dointvec,
5028 #ifdef CONFIG_IPV6_MROUTE
5030 .procname = "mc_forwarding",
5031 .data = &ipv6_devconf.mc_forwarding,
5032 .maxlen = sizeof(int),
5034 .proc_handler = proc_dointvec,
5038 .procname = "disable_ipv6",
5039 .data = &ipv6_devconf.disable_ipv6,
5040 .maxlen = sizeof(int),
5042 .proc_handler = addrconf_sysctl_disable,
5045 .procname = "accept_dad",
5046 .data = &ipv6_devconf.accept_dad,
5047 .maxlen = sizeof(int),
5049 .proc_handler = proc_dointvec,
5052 .procname = "force_tllao",
5053 .data = &ipv6_devconf.force_tllao,
5054 .maxlen = sizeof(int),
5056 .proc_handler = proc_dointvec
5059 .procname = "ndisc_notify",
5060 .data = &ipv6_devconf.ndisc_notify,
5061 .maxlen = sizeof(int),
5063 .proc_handler = proc_dointvec
5066 .procname = "suppress_frag_ndisc",
5067 .data = &ipv6_devconf.suppress_frag_ndisc,
5068 .maxlen = sizeof(int),
5070 .proc_handler = proc_dointvec
5078 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
5079 struct inet6_dev *idev, struct ipv6_devconf *p)
5082 struct addrconf_sysctl_table *t;
5083 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
5085 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
5089 for (i = 0; t->addrconf_vars[i].data; i++) {
5090 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
5091 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
5092 t->addrconf_vars[i].extra2 = net;
5095 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
5097 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
5098 if (t->sysctl_header == NULL)
5110 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5112 struct addrconf_sysctl_table *t;
5114 if (p->sysctl == NULL)
5119 unregister_net_sysctl_table(t->sysctl_header);
5123 static void addrconf_sysctl_register(struct inet6_dev *idev)
5125 neigh_sysctl_register(idev->dev, idev->nd_parms,
5126 &ndisc_ifinfo_sysctl_change);
5127 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
5131 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
5133 __addrconf_sysctl_unregister(&idev->cnf);
5134 neigh_sysctl_unregister(idev->nd_parms);
5140 static int __net_init addrconf_init_net(struct net *net)
5143 struct ipv6_devconf *all, *dflt;
5145 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
5149 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
5151 goto err_alloc_dflt;
5153 /* these will be inherited by all namespaces */
5154 dflt->autoconf = ipv6_defaults.autoconf;
5155 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
5157 net->ipv6.devconf_all = all;
5158 net->ipv6.devconf_dflt = dflt;
5160 #ifdef CONFIG_SYSCTL
5161 err = __addrconf_sysctl_register(net, "all", NULL, all);
5165 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
5171 #ifdef CONFIG_SYSCTL
5173 __addrconf_sysctl_unregister(all);
5183 static void __net_exit addrconf_exit_net(struct net *net)
5185 #ifdef CONFIG_SYSCTL
5186 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5187 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5189 if (!net_eq(net, &init_net)) {
5190 kfree(net->ipv6.devconf_dflt);
5191 kfree(net->ipv6.devconf_all);
5195 static struct pernet_operations addrconf_ops = {
5196 .init = addrconf_init_net,
5197 .exit = addrconf_exit_net,
5200 static struct rtnl_af_ops inet6_ops = {
5202 .fill_link_af = inet6_fill_link_af,
5203 .get_link_af_size = inet6_get_link_af_size,
5204 .set_link_af = inet6_set_link_af,
5208 * Init / cleanup code
5211 int __init addrconf_init(void)
5215 err = ipv6_addr_label_init();
5217 pr_crit("%s: cannot initialize default policy table: %d\n",
5222 err = register_pernet_subsys(&addrconf_ops);
5226 /* The addrconf netdev notifier requires that loopback_dev
5227 * has it's ipv6 private information allocated and setup
5228 * before it can bring up and give link-local addresses
5229 * to other devices which are up.
5231 * Unfortunately, loopback_dev is not necessarily the first
5232 * entry in the global dev_base list of net devices. In fact,
5233 * it is likely to be the very last entry on that list.
5234 * So this causes the notifier registry below to try and
5235 * give link-local addresses to all devices besides loopback_dev
5236 * first, then loopback_dev, which cases all the non-loopback_dev
5237 * devices to fail to get a link-local address.
5239 * So, as a temporary fix, allocate the ipv6 structure for
5240 * loopback_dev first by hand.
5241 * Longer term, all of the dependencies ipv6 has upon the loopback
5242 * device and it being up should be removed.
5245 if (!ipv6_add_dev(init_net.loopback_dev))
5251 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5252 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5254 register_netdevice_notifier(&ipv6_dev_notf);
5258 rtnl_af_register(&inet6_ops);
5260 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5265 /* Only the first call to __rtnl_register can fail */
5266 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5267 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5268 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5269 inet6_dump_ifaddr, NULL);
5270 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5271 inet6_dump_ifmcaddr, NULL);
5272 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5273 inet6_dump_ifacaddr, NULL);
5274 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
5275 inet6_netconf_dump_devconf, NULL);
5277 ipv6_addr_label_rtnl_register();
5281 rtnl_af_unregister(&inet6_ops);
5282 unregister_netdevice_notifier(&ipv6_dev_notf);
5284 unregister_pernet_subsys(&addrconf_ops);
5286 ipv6_addr_label_cleanup();
5291 void addrconf_cleanup(void)
5293 struct net_device *dev;
5296 unregister_netdevice_notifier(&ipv6_dev_notf);
5297 unregister_pernet_subsys(&addrconf_ops);
5298 ipv6_addr_label_cleanup();
5302 __rtnl_af_unregister(&inet6_ops);
5304 /* clean dev list */
5305 for_each_netdev(&init_net, dev) {
5306 if (__in6_dev_get(dev) == NULL)
5308 addrconf_ifdown(dev, 1);
5310 addrconf_ifdown(init_net.loopback_dev, 2);
5315 spin_lock_bh(&addrconf_hash_lock);
5316 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5317 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5318 spin_unlock_bh(&addrconf_hash_lock);
5320 del_timer(&addr_chk_timer);