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);
449 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
450 struct ipv6_devconf *devconf, u32 portid,
451 u32 seq, int event, unsigned int flags,
454 struct nlmsghdr *nlh;
455 struct netconfmsg *ncm;
457 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
462 ncm = nlmsg_data(nlh);
463 ncm->ncm_family = AF_INET6;
465 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
466 goto nla_put_failure;
468 /* type -1 is used for ALL */
469 if ((type == -1 || type == NETCONFA_FORWARDING) &&
470 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
471 goto nla_put_failure;
472 #ifdef CONFIG_IPV6_MROUTE
473 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
474 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
475 devconf->mc_forwarding) < 0)
476 goto nla_put_failure;
478 return nlmsg_end(skb, nlh);
481 nlmsg_cancel(skb, nlh);
485 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
486 struct ipv6_devconf *devconf)
491 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
495 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
496 RTM_NEWNETCONF, 0, type);
498 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
499 WARN_ON(err == -EMSGSIZE);
503 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
506 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
509 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
510 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
511 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
514 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
515 struct nlmsghdr *nlh)
517 struct net *net = sock_net(in_skb->sk);
518 struct nlattr *tb[NETCONFA_MAX+1];
519 struct netconfmsg *ncm;
521 struct ipv6_devconf *devconf;
522 struct inet6_dev *in6_dev;
523 struct net_device *dev;
527 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
528 devconf_ipv6_policy);
533 if (!tb[NETCONFA_IFINDEX])
536 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
538 case NETCONFA_IFINDEX_ALL:
539 devconf = net->ipv6.devconf_all;
541 case NETCONFA_IFINDEX_DEFAULT:
542 devconf = net->ipv6.devconf_dflt;
545 dev = __dev_get_by_index(net, ifindex);
548 in6_dev = __in6_dev_get(dev);
551 devconf = &in6_dev->cnf;
556 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
560 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
561 NETLINK_CB(in_skb).portid,
562 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
565 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
566 WARN_ON(err == -EMSGSIZE);
570 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
575 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
576 struct netlink_callback *cb)
578 struct net *net = sock_net(skb->sk);
581 struct net_device *dev;
582 struct inet6_dev *idev;
583 struct hlist_head *head;
586 s_idx = idx = cb->args[1];
588 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
590 head = &net->dev_index_head[h];
592 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
594 hlist_for_each_entry_rcu(dev, head, index_hlist) {
597 idev = __in6_dev_get(dev);
601 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
603 NETLINK_CB(cb->skb).portid,
611 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
617 if (h == NETDEV_HASHENTRIES) {
618 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
619 net->ipv6.devconf_all,
620 NETLINK_CB(cb->skb).portid,
622 RTM_NEWNETCONF, NLM_F_MULTI,
628 if (h == NETDEV_HASHENTRIES + 1) {
629 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
630 net->ipv6.devconf_dflt,
631 NETLINK_CB(cb->skb).portid,
633 RTM_NEWNETCONF, NLM_F_MULTI,
647 static void dev_forward_change(struct inet6_dev *idev)
649 struct net_device *dev;
650 struct inet6_ifaddr *ifa;
655 if (idev->cnf.forwarding)
656 dev_disable_lro(dev);
657 if (dev->flags & IFF_MULTICAST) {
658 if (idev->cnf.forwarding) {
659 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
660 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
661 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
663 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
664 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
665 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
669 list_for_each_entry(ifa, &idev->addr_list, if_list) {
670 if (ifa->flags&IFA_F_TENTATIVE)
672 if (idev->cnf.forwarding)
673 addrconf_join_anycast(ifa);
675 addrconf_leave_anycast(ifa);
677 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
678 dev->ifindex, &idev->cnf);
682 static void addrconf_forward_change(struct net *net, __s32 newf)
684 struct net_device *dev;
685 struct inet6_dev *idev;
687 for_each_netdev(net, dev) {
688 idev = __in6_dev_get(dev);
690 int changed = (!idev->cnf.forwarding) ^ (!newf);
691 idev->cnf.forwarding = newf;
693 dev_forward_change(idev);
698 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
704 return restart_syscall();
706 net = (struct net *)table->extra2;
710 if (p == &net->ipv6.devconf_dflt->forwarding) {
711 if ((!newf) ^ (!old))
712 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
713 NETCONFA_IFINDEX_DEFAULT,
714 net->ipv6.devconf_dflt);
719 if (p == &net->ipv6.devconf_all->forwarding) {
720 net->ipv6.devconf_dflt->forwarding = newf;
721 addrconf_forward_change(net, newf);
722 if ((!newf) ^ (!old))
723 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
724 NETCONFA_IFINDEX_ALL,
725 net->ipv6.devconf_all);
726 } else if ((!newf) ^ (!old))
727 dev_forward_change((struct inet6_dev *)table->extra1);
731 rt6_purge_dflt_routers(net);
736 /* Nobody refers to this ifaddr, destroy it */
737 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
739 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
741 #ifdef NET_REFCNT_DEBUG
742 pr_debug("%s\n", __func__);
745 in6_dev_put(ifp->idev);
747 if (del_timer(&ifp->dad_timer))
748 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
750 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
751 pr_warn("Freeing alive inet6 address %p\n", ifp);
760 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
763 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
766 * Each device address list is sorted in order of scope -
767 * global before linklocal.
769 list_for_each(p, &idev->addr_list) {
770 struct inet6_ifaddr *ifa
771 = list_entry(p, struct inet6_ifaddr, if_list);
772 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
776 list_add_tail(&ifp->if_list, p);
779 static u32 inet6_addr_hash(const struct in6_addr *addr)
781 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
784 /* On success it returns ifp with increased reference count */
786 static struct inet6_ifaddr *
787 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
788 const struct in6_addr *peer_addr, int pfxlen,
789 int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
791 struct inet6_ifaddr *ifa = NULL;
795 int addr_type = ipv6_addr_type(addr);
797 if (addr_type == IPV6_ADDR_ANY ||
798 addr_type & IPV6_ADDR_MULTICAST ||
799 (!(idev->dev->flags & IFF_LOOPBACK) &&
800 addr_type & IPV6_ADDR_LOOPBACK))
801 return ERR_PTR(-EADDRNOTAVAIL);
805 err = -ENODEV; /*XXX*/
809 if (idev->cnf.disable_ipv6) {
814 spin_lock(&addrconf_hash_lock);
816 /* Ignore adding duplicate addresses on an interface */
817 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
818 ADBG("ipv6_add_addr: already assigned\n");
823 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
826 ADBG("ipv6_add_addr: malloc failed\n");
831 rt = addrconf_dst_alloc(idev, addr, false);
839 ifa->peer_addr = *peer_addr;
841 spin_lock_init(&ifa->lock);
842 spin_lock_init(&ifa->state_lock);
843 setup_timer(&ifa->dad_timer, addrconf_dad_timer,
845 INIT_HLIST_NODE(&ifa->addr_lst);
847 ifa->prefix_len = pfxlen;
848 ifa->flags = flags | IFA_F_TENTATIVE;
849 ifa->valid_lft = valid_lft;
850 ifa->prefered_lft = prefered_lft;
851 ifa->cstamp = ifa->tstamp = jiffies;
852 ifa->tokenized = false;
861 /* Add to big hash table */
862 hash = inet6_addr_hash(addr);
864 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
865 spin_unlock(&addrconf_hash_lock);
867 write_lock(&idev->lock);
868 /* Add to inet6_dev unicast addr list. */
869 ipv6_link_dev_addr(idev, ifa);
871 if (ifa->flags&IFA_F_TEMPORARY) {
872 list_add(&ifa->tmp_list, &idev->tempaddr_list);
877 write_unlock(&idev->lock);
879 rcu_read_unlock_bh();
881 if (likely(err == 0))
882 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
890 spin_unlock(&addrconf_hash_lock);
894 /* This function wants to get referenced ifp and releases it before return */
896 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
898 struct inet6_ifaddr *ifa, *ifn;
899 struct inet6_dev *idev = ifp->idev;
901 int deleted = 0, onlink = 0;
902 unsigned long expires = jiffies;
904 spin_lock_bh(&ifp->state_lock);
906 ifp->state = INET6_IFADDR_STATE_DEAD;
907 spin_unlock_bh(&ifp->state_lock);
909 if (state == INET6_IFADDR_STATE_DEAD)
912 spin_lock_bh(&addrconf_hash_lock);
913 hlist_del_init_rcu(&ifp->addr_lst);
914 spin_unlock_bh(&addrconf_hash_lock);
916 write_lock_bh(&idev->lock);
918 if (ifp->flags&IFA_F_TEMPORARY) {
919 list_del(&ifp->tmp_list);
921 in6_ifa_put(ifp->ifpub);
927 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
929 list_del_init(&ifp->if_list);
932 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
936 } else if (ifp->flags & IFA_F_PERMANENT) {
937 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
939 if (ifa->flags & IFA_F_PERMANENT) {
944 unsigned long lifetime;
949 spin_lock(&ifa->lock);
951 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
953 * Note: Because this address is
954 * not permanent, lifetime <
955 * LONG_MAX / HZ here.
957 if (time_before(expires,
958 ifa->tstamp + lifetime * HZ))
959 expires = ifa->tstamp + lifetime * HZ;
960 spin_unlock(&ifa->lock);
965 write_unlock_bh(&idev->lock);
967 addrconf_del_dad_timer(ifp);
969 ipv6_ifa_notify(RTM_DELADDR, ifp);
971 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
974 * Purge or update corresponding prefix
976 * 1) we don't purge prefix here if address was not permanent.
977 * prefix is managed by its own lifetime.
978 * 2) if there're no addresses, delete prefix.
979 * 3) if there're still other permanent address(es),
980 * corresponding prefix is still permanent.
981 * 4) otherwise, update prefix lifetime to the
982 * longest valid lifetime among the corresponding
983 * addresses on the device.
984 * Note: subsequent RA will update lifetime.
988 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
989 struct in6_addr prefix;
992 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
994 rt = addrconf_get_prefix_route(&prefix,
997 0, RTF_GATEWAY | RTF_DEFAULT);
1003 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
1004 rt6_set_expires(rt, expires);
1010 /* clean up prefsrc entries */
1011 rt6_remove_prefsrc(ifp);
1016 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1018 struct inet6_dev *idev = ifp->idev;
1019 struct in6_addr addr, *tmpaddr;
1020 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1021 unsigned long regen_advance;
1025 unsigned long now = jiffies;
1027 write_lock(&idev->lock);
1029 spin_lock_bh(&ift->lock);
1030 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1031 spin_unlock_bh(&ift->lock);
1038 if (idev->cnf.use_tempaddr <= 0) {
1039 write_unlock(&idev->lock);
1040 pr_info("%s: use_tempaddr is disabled\n", __func__);
1045 spin_lock_bh(&ifp->lock);
1046 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1047 idev->cnf.use_tempaddr = -1; /*XXX*/
1048 spin_unlock_bh(&ifp->lock);
1049 write_unlock(&idev->lock);
1050 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1057 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1058 __ipv6_try_regen_rndid(idev, tmpaddr);
1059 memcpy(&addr.s6_addr[8], idev->rndid, 8);
1060 age = (now - ifp->tstamp) / HZ;
1061 tmp_valid_lft = min_t(__u32,
1063 idev->cnf.temp_valid_lft + age);
1064 tmp_prefered_lft = min_t(__u32,
1066 idev->cnf.temp_prefered_lft + age -
1067 idev->cnf.max_desync_factor);
1068 tmp_plen = ifp->prefix_len;
1069 tmp_tstamp = ifp->tstamp;
1070 spin_unlock_bh(&ifp->lock);
1072 regen_advance = idev->cnf.regen_max_retry *
1073 idev->cnf.dad_transmits *
1074 idev->nd_parms->retrans_time / HZ;
1075 write_unlock(&idev->lock);
1077 /* A temporary address is created only if this calculated Preferred
1078 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1079 * an implementation must not create a temporary address with a zero
1080 * Preferred Lifetime.
1082 if (tmp_prefered_lft <= regen_advance) {
1089 addr_flags = IFA_F_TEMPORARY;
1090 /* set in addrconf_prefix_rcv() */
1091 if (ifp->flags & IFA_F_OPTIMISTIC)
1092 addr_flags |= IFA_F_OPTIMISTIC;
1094 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1095 ipv6_addr_scope(&addr), addr_flags,
1096 tmp_valid_lft, tmp_prefered_lft);
1100 pr_info("%s: retry temporary address regeneration\n", __func__);
1102 write_lock(&idev->lock);
1106 spin_lock_bh(&ift->lock);
1109 ift->tstamp = tmp_tstamp;
1110 spin_unlock_bh(&ift->lock);
1112 addrconf_dad_start(ift);
1120 * Choose an appropriate source address (RFC3484)
1123 IPV6_SADDR_RULE_INIT = 0,
1124 IPV6_SADDR_RULE_LOCAL,
1125 IPV6_SADDR_RULE_SCOPE,
1126 IPV6_SADDR_RULE_PREFERRED,
1127 #ifdef CONFIG_IPV6_MIP6
1128 IPV6_SADDR_RULE_HOA,
1130 IPV6_SADDR_RULE_OIF,
1131 IPV6_SADDR_RULE_LABEL,
1132 IPV6_SADDR_RULE_PRIVACY,
1133 IPV6_SADDR_RULE_ORCHID,
1134 IPV6_SADDR_RULE_PREFIX,
1138 struct ipv6_saddr_score {
1141 struct inet6_ifaddr *ifa;
1142 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1147 struct ipv6_saddr_dst {
1148 const struct in6_addr *addr;
1155 static inline int ipv6_saddr_preferred(int type)
1157 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1162 static int ipv6_get_saddr_eval(struct net *net,
1163 struct ipv6_saddr_score *score,
1164 struct ipv6_saddr_dst *dst,
1169 if (i <= score->rule) {
1171 case IPV6_SADDR_RULE_SCOPE:
1172 ret = score->scopedist;
1174 case IPV6_SADDR_RULE_PREFIX:
1175 ret = score->matchlen;
1178 ret = !!test_bit(i, score->scorebits);
1184 case IPV6_SADDR_RULE_INIT:
1185 /* Rule 0: remember if hiscore is not ready yet */
1188 case IPV6_SADDR_RULE_LOCAL:
1189 /* Rule 1: Prefer same address */
1190 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1192 case IPV6_SADDR_RULE_SCOPE:
1193 /* Rule 2: Prefer appropriate scope
1198 * ---+--+-+---> scope
1200 * | d is scope of the destination.
1202 * | \ <- smaller scope is better if
1203 * B-15 | \ if scope is enough for destinaion.
1204 * | ret = B - scope (-1 <= scope >= d <= 15).
1206 * |/ <- greater is better
1207 * -C / if scope is not enough for destination.
1208 * /| ret = scope - C (-1 <= d < scope <= 15).
1210 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1211 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1212 * Assume B = 0 and we get C > 29.
1214 ret = __ipv6_addr_src_scope(score->addr_type);
1215 if (ret >= dst->scope)
1218 ret -= 128; /* 30 is enough */
1219 score->scopedist = ret;
1221 case IPV6_SADDR_RULE_PREFERRED:
1222 /* Rule 3: Avoid deprecated and optimistic addresses */
1223 ret = ipv6_saddr_preferred(score->addr_type) ||
1224 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1226 #ifdef CONFIG_IPV6_MIP6
1227 case IPV6_SADDR_RULE_HOA:
1229 /* Rule 4: Prefer home address */
1230 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1231 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1235 case IPV6_SADDR_RULE_OIF:
1236 /* Rule 5: Prefer outgoing interface */
1237 ret = (!dst->ifindex ||
1238 dst->ifindex == score->ifa->idev->dev->ifindex);
1240 case IPV6_SADDR_RULE_LABEL:
1241 /* Rule 6: Prefer matching label */
1242 ret = ipv6_addr_label(net,
1243 &score->ifa->addr, score->addr_type,
1244 score->ifa->idev->dev->ifindex) == dst->label;
1246 case IPV6_SADDR_RULE_PRIVACY:
1248 /* Rule 7: Prefer public address
1249 * Note: prefer temporary address if use_tempaddr >= 2
1251 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1252 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1253 score->ifa->idev->cnf.use_tempaddr >= 2;
1254 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1257 case IPV6_SADDR_RULE_ORCHID:
1258 /* Rule 8-: Prefer ORCHID vs ORCHID or
1259 * non-ORCHID vs non-ORCHID
1261 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1262 ipv6_addr_orchid(dst->addr));
1264 case IPV6_SADDR_RULE_PREFIX:
1265 /* Rule 8: Use longest matching prefix */
1266 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1267 if (ret > score->ifa->prefix_len)
1268 ret = score->ifa->prefix_len;
1269 score->matchlen = ret;
1276 __set_bit(i, score->scorebits);
1282 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1283 const struct in6_addr *daddr, unsigned int prefs,
1284 struct in6_addr *saddr)
1286 struct ipv6_saddr_score scores[2],
1287 *score = &scores[0], *hiscore = &scores[1];
1288 struct ipv6_saddr_dst dst;
1289 struct net_device *dev;
1292 dst_type = __ipv6_addr_type(daddr);
1294 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1295 dst.scope = __ipv6_addr_src_scope(dst_type);
1296 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1300 hiscore->ifa = NULL;
1304 for_each_netdev_rcu(net, dev) {
1305 struct inet6_dev *idev;
1307 /* Candidate Source Address (section 4)
1308 * - multicast and link-local destination address,
1309 * the set of candidate source address MUST only
1310 * include addresses assigned to interfaces
1311 * belonging to the same link as the outgoing
1313 * (- For site-local destination addresses, the
1314 * set of candidate source addresses MUST only
1315 * include addresses assigned to interfaces
1316 * belonging to the same site as the outgoing
1319 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1320 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1321 dst.ifindex && dev->ifindex != dst.ifindex)
1324 idev = __in6_dev_get(dev);
1328 read_lock_bh(&idev->lock);
1329 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1333 * - Tentative Address (RFC2462 section 5.4)
1334 * - A tentative address is not considered
1335 * "assigned to an interface" in the traditional
1336 * sense, unless it is also flagged as optimistic.
1337 * - Candidate Source Address (section 4)
1338 * - In any case, anycast addresses, multicast
1339 * addresses, and the unspecified address MUST
1340 * NOT be included in a candidate set.
1342 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1343 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1346 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1348 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1349 score->addr_type & IPV6_ADDR_MULTICAST)) {
1350 LIMIT_NETDEBUG(KERN_DEBUG
1351 "ADDRCONF: unspecified / multicast address "
1352 "assigned as unicast address on %s",
1358 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1360 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1361 int minihiscore, miniscore;
1363 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1364 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1366 if (minihiscore > miniscore) {
1367 if (i == IPV6_SADDR_RULE_SCOPE &&
1368 score->scopedist > 0) {
1371 * each remaining entry
1372 * has too small (not enough)
1373 * scope, because ifa entries
1374 * are sorted by their scope
1380 } else if (minihiscore < miniscore) {
1382 in6_ifa_put(hiscore->ifa);
1384 in6_ifa_hold(score->ifa);
1386 swap(hiscore, score);
1388 /* restore our iterator */
1389 score->ifa = hiscore->ifa;
1396 read_unlock_bh(&idev->lock);
1401 return -EADDRNOTAVAIL;
1403 *saddr = hiscore->ifa->addr;
1404 in6_ifa_put(hiscore->ifa);
1407 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1409 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1410 unsigned char banned_flags)
1412 struct inet6_ifaddr *ifp;
1413 int err = -EADDRNOTAVAIL;
1415 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1416 if (ifp->scope == IFA_LINK &&
1417 !(ifp->flags & banned_flags)) {
1426 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1427 unsigned char banned_flags)
1429 struct inet6_dev *idev;
1430 int err = -EADDRNOTAVAIL;
1433 idev = __in6_dev_get(dev);
1435 read_lock_bh(&idev->lock);
1436 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1437 read_unlock_bh(&idev->lock);
1443 static int ipv6_count_addresses(struct inet6_dev *idev)
1446 struct inet6_ifaddr *ifp;
1448 read_lock_bh(&idev->lock);
1449 list_for_each_entry(ifp, &idev->addr_list, if_list)
1451 read_unlock_bh(&idev->lock);
1455 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1456 const struct net_device *dev, int strict)
1458 struct inet6_ifaddr *ifp;
1459 unsigned int hash = inet6_addr_hash(addr);
1462 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1463 if (!net_eq(dev_net(ifp->idev->dev), net))
1465 if (ipv6_addr_equal(&ifp->addr, addr) &&
1466 !(ifp->flags&IFA_F_TENTATIVE) &&
1467 (dev == NULL || ifp->idev->dev == dev ||
1468 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1469 rcu_read_unlock_bh();
1474 rcu_read_unlock_bh();
1477 EXPORT_SYMBOL(ipv6_chk_addr);
1479 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1480 struct net_device *dev)
1482 unsigned int hash = inet6_addr_hash(addr);
1483 struct inet6_ifaddr *ifp;
1485 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1486 if (!net_eq(dev_net(ifp->idev->dev), net))
1488 if (ipv6_addr_equal(&ifp->addr, addr)) {
1489 if (dev == NULL || ifp->idev->dev == dev)
1496 /* Compares an address/prefix_len with addresses on device @dev.
1497 * If one is found it returns true.
1499 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1500 const unsigned int prefix_len, struct net_device *dev)
1502 struct inet6_dev *idev;
1503 struct inet6_ifaddr *ifa;
1507 idev = __in6_dev_get(dev);
1509 read_lock_bh(&idev->lock);
1510 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1511 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1515 read_unlock_bh(&idev->lock);
1521 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1523 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1525 struct inet6_dev *idev;
1526 struct inet6_ifaddr *ifa;
1531 idev = __in6_dev_get(dev);
1533 read_lock_bh(&idev->lock);
1534 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1535 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1540 read_unlock_bh(&idev->lock);
1545 EXPORT_SYMBOL(ipv6_chk_prefix);
1547 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1548 struct net_device *dev, int strict)
1550 struct inet6_ifaddr *ifp, *result = NULL;
1551 unsigned int hash = inet6_addr_hash(addr);
1554 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1555 if (!net_eq(dev_net(ifp->idev->dev), net))
1557 if (ipv6_addr_equal(&ifp->addr, addr)) {
1558 if (dev == NULL || ifp->idev->dev == dev ||
1559 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1566 rcu_read_unlock_bh();
1571 /* Gets referenced address, destroys ifaddr */
1573 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1575 if (ifp->flags&IFA_F_PERMANENT) {
1576 spin_lock_bh(&ifp->lock);
1577 addrconf_del_dad_timer(ifp);
1578 ifp->flags |= IFA_F_TENTATIVE;
1580 ifp->flags |= IFA_F_DADFAILED;
1581 spin_unlock_bh(&ifp->lock);
1583 ipv6_ifa_notify(0, ifp);
1585 } else if (ifp->flags&IFA_F_TEMPORARY) {
1586 struct inet6_ifaddr *ifpub;
1587 spin_lock_bh(&ifp->lock);
1590 in6_ifa_hold(ifpub);
1591 spin_unlock_bh(&ifp->lock);
1592 ipv6_create_tempaddr(ifpub, ifp);
1595 spin_unlock_bh(&ifp->lock);
1602 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1606 spin_lock(&ifp->state_lock);
1607 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1608 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1611 spin_unlock(&ifp->state_lock);
1616 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1618 struct inet6_dev *idev = ifp->idev;
1620 if (addrconf_dad_end(ifp)) {
1625 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1626 ifp->idev->dev->name, &ifp->addr);
1628 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1629 struct in6_addr addr;
1631 addr.s6_addr32[0] = htonl(0xfe800000);
1632 addr.s6_addr32[1] = 0;
1634 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1635 ipv6_addr_equal(&ifp->addr, &addr)) {
1636 /* DAD failed for link-local based on MAC address */
1637 idev->cnf.disable_ipv6 = 1;
1639 pr_info("%s: IPv6 being disabled!\n",
1640 ifp->idev->dev->name);
1644 addrconf_dad_stop(ifp, 1);
1647 /* Join to solicited addr multicast group. */
1649 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1651 struct in6_addr maddr;
1653 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1656 addrconf_addr_solict_mult(addr, &maddr);
1657 ipv6_dev_mc_inc(dev, &maddr);
1660 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1662 struct in6_addr maddr;
1664 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1667 addrconf_addr_solict_mult(addr, &maddr);
1668 __ipv6_dev_mc_dec(idev, &maddr);
1671 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1673 struct in6_addr addr;
1674 if (ifp->prefix_len == 127) /* RFC 6164 */
1676 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1677 if (ipv6_addr_any(&addr))
1679 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1682 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1684 struct in6_addr addr;
1685 if (ifp->prefix_len == 127) /* RFC 6164 */
1687 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1688 if (ipv6_addr_any(&addr))
1690 __ipv6_dev_ac_dec(ifp->idev, &addr);
1693 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1695 if (dev->addr_len != ETH_ALEN)
1697 memcpy(eui, dev->dev_addr, 3);
1698 memcpy(eui + 5, dev->dev_addr + 3, 3);
1701 * The zSeries OSA network cards can be shared among various
1702 * OS instances, but the OSA cards have only one MAC address.
1703 * This leads to duplicate address conflicts in conjunction
1704 * with IPv6 if more than one instance uses the same card.
1706 * The driver for these cards can deliver a unique 16-bit
1707 * identifier for each instance sharing the same card. It is
1708 * placed instead of 0xFFFE in the interface identifier. The
1709 * "u" bit of the interface identifier is not inverted in this
1710 * case. Hence the resulting interface identifier has local
1711 * scope according to RFC2373.
1714 eui[3] = (dev->dev_id >> 8) & 0xFF;
1715 eui[4] = dev->dev_id & 0xFF;
1724 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1726 if (dev->addr_len != IEEE802154_ADDR_LEN)
1728 memcpy(eui, dev->dev_addr, 8);
1733 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1735 union fwnet_hwaddr *ha;
1737 if (dev->addr_len != FWNET_ALEN)
1740 ha = (union fwnet_hwaddr *)dev->dev_addr;
1742 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1747 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1749 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1750 if (dev->addr_len != ARCNET_ALEN)
1753 eui[7] = *(u8 *)dev->dev_addr;
1757 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1759 if (dev->addr_len != INFINIBAND_ALEN)
1761 memcpy(eui, dev->dev_addr + 12, 8);
1766 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1770 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1771 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1772 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1773 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1774 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1775 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1779 memcpy(eui + 4, &addr, 4);
1783 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1785 if (dev->priv_flags & IFF_ISATAP)
1786 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1790 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1792 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1795 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
1797 memcpy(eui, dev->perm_addr, 3);
1798 memcpy(eui + 5, dev->perm_addr + 3, 3);
1805 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1807 switch (dev->type) {
1810 return addrconf_ifid_eui48(eui, dev);
1812 return addrconf_ifid_arcnet(eui, dev);
1813 case ARPHRD_INFINIBAND:
1814 return addrconf_ifid_infiniband(eui, dev);
1816 return addrconf_ifid_sit(eui, dev);
1818 return addrconf_ifid_gre(eui, dev);
1819 case ARPHRD_IEEE802154:
1820 return addrconf_ifid_eui64(eui, dev);
1821 case ARPHRD_IEEE1394:
1822 return addrconf_ifid_ieee1394(eui, dev);
1823 case ARPHRD_TUNNEL6:
1824 return addrconf_ifid_ip6tnl(eui, dev);
1829 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1832 struct inet6_ifaddr *ifp;
1834 read_lock_bh(&idev->lock);
1835 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1836 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1837 memcpy(eui, ifp->addr.s6_addr+8, 8);
1842 read_unlock_bh(&idev->lock);
1846 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1847 static void __ipv6_regen_rndid(struct inet6_dev *idev)
1850 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1851 idev->rndid[0] &= ~0x02;
1854 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1855 * check if generated address is not inappropriate
1857 * - Reserved subnet anycast (RFC 2526)
1858 * 11111101 11....11 1xxxxxxx
1859 * - ISATAP (RFC4214) 6.1
1860 * 00-00-5E-FE-xx-xx-xx-xx
1862 * - XXX: already assigned to an address on the device
1864 if (idev->rndid[0] == 0xfd &&
1865 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1866 (idev->rndid[7]&0x80))
1868 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1869 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1871 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1876 static void ipv6_regen_rndid(unsigned long data)
1878 struct inet6_dev *idev = (struct inet6_dev *) data;
1879 unsigned long expires;
1882 write_lock_bh(&idev->lock);
1887 __ipv6_regen_rndid(idev);
1890 idev->cnf.temp_prefered_lft * HZ -
1891 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1892 idev->cnf.max_desync_factor * HZ;
1893 if (time_before(expires, jiffies)) {
1894 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
1895 __func__, idev->dev->name);
1899 if (!mod_timer(&idev->regen_timer, expires))
1903 write_unlock_bh(&idev->lock);
1904 rcu_read_unlock_bh();
1908 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
1910 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1911 __ipv6_regen_rndid(idev);
1919 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1920 unsigned long expires, u32 flags)
1922 struct fib6_config cfg = {
1923 .fc_table = RT6_TABLE_PREFIX,
1924 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1925 .fc_ifindex = dev->ifindex,
1926 .fc_expires = expires,
1928 .fc_flags = RTF_UP | flags,
1929 .fc_nlinfo.nl_net = dev_net(dev),
1930 .fc_protocol = RTPROT_KERNEL,
1935 /* Prevent useless cloning on PtP SIT.
1936 This thing is done here expecting that the whole
1937 class of non-broadcast devices need not cloning.
1939 #if IS_ENABLED(CONFIG_IPV6_SIT)
1940 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1941 cfg.fc_flags |= RTF_NONEXTHOP;
1944 ip6_route_add(&cfg);
1948 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
1950 const struct net_device *dev,
1951 u32 flags, u32 noflags)
1953 struct fib6_node *fn;
1954 struct rt6_info *rt = NULL;
1955 struct fib6_table *table;
1957 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
1961 read_lock_bh(&table->tb6_lock);
1962 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
1965 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1966 if (rt->dst.dev->ifindex != dev->ifindex)
1968 if ((rt->rt6i_flags & flags) != flags)
1970 if ((rt->rt6i_flags & noflags) != 0)
1976 read_unlock_bh(&table->tb6_lock);
1981 /* Create "default" multicast route to the interface */
1983 static void addrconf_add_mroute(struct net_device *dev)
1985 struct fib6_config cfg = {
1986 .fc_table = RT6_TABLE_LOCAL,
1987 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1988 .fc_ifindex = dev->ifindex,
1991 .fc_nlinfo.nl_net = dev_net(dev),
1994 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1996 ip6_route_add(&cfg);
1999 #if IS_ENABLED(CONFIG_IPV6_SIT)
2000 static void sit_route_add(struct net_device *dev)
2002 struct fib6_config cfg = {
2003 .fc_table = RT6_TABLE_MAIN,
2004 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2005 .fc_ifindex = dev->ifindex,
2007 .fc_flags = RTF_UP | RTF_NONEXTHOP,
2008 .fc_nlinfo.nl_net = dev_net(dev),
2011 /* prefix length - 96 bits "::d.d.d.d" */
2012 ip6_route_add(&cfg);
2016 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2018 struct inet6_dev *idev;
2022 idev = ipv6_find_idev(dev);
2024 return ERR_PTR(-ENOBUFS);
2026 if (idev->cnf.disable_ipv6)
2027 return ERR_PTR(-EACCES);
2029 /* Add default multicast route */
2030 if (!(dev->flags & IFF_LOOPBACK))
2031 addrconf_add_mroute(dev);
2036 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2038 struct prefix_info *pinfo;
2042 struct inet6_dev *in6_dev;
2043 struct net *net = dev_net(dev);
2045 pinfo = (struct prefix_info *) opt;
2047 if (len < sizeof(struct prefix_info)) {
2048 ADBG("addrconf: prefix option too short\n");
2053 * Validation checks ([ADDRCONF], page 19)
2056 addr_type = ipv6_addr_type(&pinfo->prefix);
2058 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2061 valid_lft = ntohl(pinfo->valid);
2062 prefered_lft = ntohl(pinfo->prefered);
2064 if (prefered_lft > valid_lft) {
2065 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2069 in6_dev = in6_dev_get(dev);
2071 if (in6_dev == NULL) {
2072 net_dbg_ratelimited("addrconf: device %s not configured\n",
2078 * Two things going on here:
2079 * 1) Add routes for on-link prefixes
2080 * 2) Configure prefixes with the auto flag set
2083 if (pinfo->onlink) {
2084 struct rt6_info *rt;
2085 unsigned long rt_expires;
2087 /* Avoid arithmetic overflow. Really, we could
2088 * save rt_expires in seconds, likely valid_lft,
2089 * but it would require division in fib gc, that it
2093 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2095 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2097 if (addrconf_finite_timeout(rt_expires))
2100 rt = addrconf_get_prefix_route(&pinfo->prefix,
2103 RTF_ADDRCONF | RTF_PREFIX_RT,
2104 RTF_GATEWAY | RTF_DEFAULT);
2107 /* Autoconf prefix route */
2108 if (valid_lft == 0) {
2111 } else if (addrconf_finite_timeout(rt_expires)) {
2113 rt6_set_expires(rt, jiffies + rt_expires);
2115 rt6_clean_expires(rt);
2117 } else if (valid_lft) {
2118 clock_t expires = 0;
2119 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2120 if (addrconf_finite_timeout(rt_expires)) {
2122 flags |= RTF_EXPIRES;
2123 expires = jiffies_to_clock_t(rt_expires);
2125 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2126 dev, expires, flags);
2131 /* Try to figure out our local address for this prefix */
2133 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2134 struct inet6_ifaddr *ifp;
2135 struct in6_addr addr;
2136 int create = 0, update_lft = 0;
2137 bool tokenized = false;
2139 if (pinfo->prefix_len == 64) {
2140 memcpy(&addr, &pinfo->prefix, 8);
2142 if (!ipv6_addr_any(&in6_dev->token)) {
2143 read_lock_bh(&in6_dev->lock);
2144 memcpy(addr.s6_addr + 8,
2145 in6_dev->token.s6_addr + 8, 8);
2146 read_unlock_bh(&in6_dev->lock);
2148 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2149 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2150 in6_dev_put(in6_dev);
2155 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2157 in6_dev_put(in6_dev);
2162 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
2164 if (ifp == NULL && valid_lft) {
2165 int max_addresses = in6_dev->cnf.max_addresses;
2168 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2169 if (in6_dev->cnf.optimistic_dad &&
2170 !net->ipv6.devconf_all->forwarding && sllao)
2171 addr_flags = IFA_F_OPTIMISTIC;
2174 /* Do not allow to create too much of autoconfigured
2175 * addresses; this would be too easy way to crash kernel.
2177 if (!max_addresses ||
2178 ipv6_count_addresses(in6_dev) < max_addresses)
2179 ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2181 addr_type&IPV6_ADDR_SCOPE_MASK,
2182 addr_flags, valid_lft,
2185 if (IS_ERR_OR_NULL(ifp)) {
2186 in6_dev_put(in6_dev);
2192 ifp->cstamp = jiffies;
2193 ifp->tokenized = tokenized;
2194 addrconf_dad_start(ifp);
2200 struct inet6_ifaddr *ift;
2203 /* update lifetime (RFC2462 5.5.3 e) */
2204 spin_lock(&ifp->lock);
2206 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2207 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2210 if (!update_lft && !create && stored_lft) {
2211 const u32 minimum_lft = min(
2212 stored_lft, (u32)MIN_VALID_LIFETIME);
2213 valid_lft = max(valid_lft, minimum_lft);
2215 /* RFC4862 Section 5.5.3e:
2216 * "Note that the preferred lifetime of the
2217 * corresponding address is always reset to
2218 * the Preferred Lifetime in the received
2219 * Prefix Information option, regardless of
2220 * whether the valid lifetime is also reset or
2223 * So we should always update prefered_lft here.
2229 ifp->valid_lft = valid_lft;
2230 ifp->prefered_lft = prefered_lft;
2233 ifp->flags &= ~IFA_F_DEPRECATED;
2234 spin_unlock(&ifp->lock);
2236 if (!(flags&IFA_F_TENTATIVE))
2237 ipv6_ifa_notify(0, ifp);
2239 spin_unlock(&ifp->lock);
2241 read_lock_bh(&in6_dev->lock);
2242 /* update all temporary addresses in the list */
2243 list_for_each_entry(ift, &in6_dev->tempaddr_list,
2245 int age, max_valid, max_prefered;
2247 if (ifp != ift->ifpub)
2251 * RFC 4941 section 3.3:
2252 * If a received option will extend the lifetime
2253 * of a public address, the lifetimes of
2254 * temporary addresses should be extended,
2255 * subject to the overall constraint that no
2256 * temporary addresses should ever remain
2257 * "valid" or "preferred" for a time longer than
2258 * (TEMP_VALID_LIFETIME) or
2259 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR),
2262 age = (now - ift->cstamp) / HZ;
2263 max_valid = in6_dev->cnf.temp_valid_lft - age;
2267 max_prefered = in6_dev->cnf.temp_prefered_lft -
2268 in6_dev->cnf.max_desync_factor -
2270 if (max_prefered < 0)
2273 if (valid_lft > max_valid)
2274 valid_lft = max_valid;
2276 if (prefered_lft > max_prefered)
2277 prefered_lft = max_prefered;
2279 spin_lock(&ift->lock);
2281 ift->valid_lft = valid_lft;
2282 ift->prefered_lft = prefered_lft;
2284 if (prefered_lft > 0)
2285 ift->flags &= ~IFA_F_DEPRECATED;
2287 spin_unlock(&ift->lock);
2288 if (!(flags&IFA_F_TENTATIVE))
2289 ipv6_ifa_notify(0, ift);
2292 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
2294 * When a new public address is created as
2295 * described in [ADDRCONF], also create a new
2296 * temporary address. Also create a temporary
2297 * address if it's enabled but no temporary
2298 * address currently exists.
2300 read_unlock_bh(&in6_dev->lock);
2301 ipv6_create_tempaddr(ifp, NULL);
2303 read_unlock_bh(&in6_dev->lock);
2310 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2311 in6_dev_put(in6_dev);
2315 * Set destination address.
2316 * Special case for SIT interfaces where we create a new "virtual"
2319 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2321 struct in6_ifreq ireq;
2322 struct net_device *dev;
2328 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2331 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2337 #if IS_ENABLED(CONFIG_IPV6_SIT)
2338 if (dev->type == ARPHRD_SIT) {
2339 const struct net_device_ops *ops = dev->netdev_ops;
2341 struct ip_tunnel_parm p;
2343 err = -EADDRNOTAVAIL;
2344 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2347 memset(&p, 0, sizeof(p));
2348 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2352 p.iph.protocol = IPPROTO_IPV6;
2354 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2356 if (ops->ndo_do_ioctl) {
2357 mm_segment_t oldfs = get_fs();
2360 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2367 dev = __dev_get_by_name(net, p.name);
2370 err = dev_open(dev);
2381 * Manual configuration of address on an interface
2383 static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx,
2384 const struct in6_addr *peer_pfx,
2385 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2388 struct inet6_ifaddr *ifp;
2389 struct inet6_dev *idev;
2390 struct net_device *dev;
2394 unsigned long timeout;
2401 /* check the lifetime */
2402 if (!valid_lft || prefered_lft > valid_lft)
2405 dev = __dev_get_by_index(net, ifindex);
2409 idev = addrconf_add_dev(dev);
2411 return PTR_ERR(idev);
2413 scope = ipv6_addr_scope(pfx);
2415 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2416 if (addrconf_finite_timeout(timeout)) {
2417 expires = jiffies_to_clock_t(timeout * HZ);
2418 valid_lft = timeout;
2419 flags = RTF_EXPIRES;
2423 ifa_flags |= IFA_F_PERMANENT;
2426 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2427 if (addrconf_finite_timeout(timeout)) {
2429 ifa_flags |= IFA_F_DEPRECATED;
2430 prefered_lft = timeout;
2433 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2434 valid_lft, prefered_lft);
2437 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2440 * Note that section 3.1 of RFC 4429 indicates
2441 * that the Optimistic flag should not be set for
2442 * manually configured addresses
2444 addrconf_dad_start(ifp);
2450 return PTR_ERR(ifp);
2453 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
2456 struct inet6_ifaddr *ifp;
2457 struct inet6_dev *idev;
2458 struct net_device *dev;
2463 dev = __dev_get_by_index(net, ifindex);
2467 if ((idev = __in6_dev_get(dev)) == NULL)
2470 read_lock_bh(&idev->lock);
2471 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2472 if (ifp->prefix_len == plen &&
2473 ipv6_addr_equal(pfx, &ifp->addr)) {
2475 read_unlock_bh(&idev->lock);
2481 read_unlock_bh(&idev->lock);
2482 return -EADDRNOTAVAIL;
2486 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2488 struct in6_ifreq ireq;
2491 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2494 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2498 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2499 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2500 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2505 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2507 struct in6_ifreq ireq;
2510 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2513 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2517 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2518 ireq.ifr6_prefixlen);
2523 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2524 int plen, int scope)
2526 struct inet6_ifaddr *ifp;
2528 ifp = ipv6_add_addr(idev, addr, NULL, plen,
2529 scope, IFA_F_PERMANENT, 0, 0);
2531 spin_lock_bh(&ifp->lock);
2532 ifp->flags &= ~IFA_F_TENTATIVE;
2533 spin_unlock_bh(&ifp->lock);
2534 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2539 #if IS_ENABLED(CONFIG_IPV6_SIT)
2540 static void sit_add_v4_addrs(struct inet6_dev *idev)
2542 struct in6_addr addr;
2543 struct net_device *dev;
2544 struct net *net = dev_net(idev->dev);
2549 memset(&addr, 0, sizeof(struct in6_addr));
2550 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2552 if (idev->dev->flags&IFF_POINTOPOINT) {
2553 addr.s6_addr32[0] = htonl(0xfe800000);
2556 scope = IPV6_ADDR_COMPATv4;
2559 if (addr.s6_addr32[3]) {
2560 add_addr(idev, &addr, 128, scope);
2564 for_each_netdev(net, dev) {
2565 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2566 if (in_dev && (dev->flags & IFF_UP)) {
2567 struct in_ifaddr *ifa;
2571 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2574 addr.s6_addr32[3] = ifa->ifa_local;
2576 if (ifa->ifa_scope == RT_SCOPE_LINK)
2578 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2579 if (idev->dev->flags&IFF_POINTOPOINT)
2583 if (idev->dev->flags&IFF_POINTOPOINT)
2588 add_addr(idev, &addr, plen, flag);
2595 static void init_loopback(struct net_device *dev)
2597 struct inet6_dev *idev;
2598 struct net_device *sp_dev;
2599 struct inet6_ifaddr *sp_ifa;
2600 struct rt6_info *sp_rt;
2606 if ((idev = ipv6_find_idev(dev)) == NULL) {
2607 pr_debug("%s: add_dev failed\n", __func__);
2611 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2613 /* Add routes to other interface's IPv6 addresses */
2614 for_each_netdev(dev_net(dev), sp_dev) {
2615 if (!strcmp(sp_dev->name, dev->name))
2618 idev = __in6_dev_get(sp_dev);
2622 read_lock_bh(&idev->lock);
2623 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2625 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2631 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, 0);
2633 /* Failure cases are ignored */
2634 if (!IS_ERR(sp_rt)) {
2639 read_unlock_bh(&idev->lock);
2643 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
2645 struct inet6_ifaddr *ifp;
2646 u32 addr_flags = IFA_F_PERMANENT;
2648 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2649 if (idev->cnf.optimistic_dad &&
2650 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2651 addr_flags |= IFA_F_OPTIMISTIC;
2655 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags, 0, 0);
2657 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2658 addrconf_dad_start(ifp);
2663 static void addrconf_dev_config(struct net_device *dev)
2665 struct in6_addr addr;
2666 struct inet6_dev *idev;
2670 if ((dev->type != ARPHRD_ETHER) &&
2671 (dev->type != ARPHRD_FDDI) &&
2672 (dev->type != ARPHRD_ARCNET) &&
2673 (dev->type != ARPHRD_INFINIBAND) &&
2674 (dev->type != ARPHRD_IEEE802154) &&
2675 (dev->type != ARPHRD_IEEE1394) &&
2676 (dev->type != ARPHRD_TUNNEL6)) {
2677 /* Alas, we support only Ethernet autoconfiguration. */
2681 idev = addrconf_add_dev(dev);
2685 memset(&addr, 0, sizeof(struct in6_addr));
2686 addr.s6_addr32[0] = htonl(0xFE800000);
2688 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2689 addrconf_add_linklocal(idev, &addr);
2692 #if IS_ENABLED(CONFIG_IPV6_SIT)
2693 static void addrconf_sit_config(struct net_device *dev)
2695 struct inet6_dev *idev;
2700 * Configure the tunnel with one of our IPv4
2701 * addresses... we should configure all of
2702 * our v4 addrs in the tunnel
2705 if ((idev = ipv6_find_idev(dev)) == NULL) {
2706 pr_debug("%s: add_dev failed\n", __func__);
2710 if (dev->priv_flags & IFF_ISATAP) {
2711 struct in6_addr addr;
2713 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2714 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2715 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2716 addrconf_add_linklocal(idev, &addr);
2720 sit_add_v4_addrs(idev);
2722 if (dev->flags&IFF_POINTOPOINT)
2723 addrconf_add_mroute(dev);
2729 #if IS_ENABLED(CONFIG_NET_IPGRE)
2730 static void addrconf_gre_config(struct net_device *dev)
2732 struct inet6_dev *idev;
2733 struct in6_addr addr;
2737 if ((idev = ipv6_find_idev(dev)) == NULL) {
2738 pr_debug("%s: add_dev failed\n", __func__);
2742 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2743 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2745 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2746 addrconf_add_linklocal(idev, &addr);
2751 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2753 struct in6_addr lladdr;
2755 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2756 addrconf_add_linklocal(idev, &lladdr);
2762 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2765 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2766 struct inet6_dev *idev = __in6_dev_get(dev);
2767 int run_pending = 0;
2771 case NETDEV_REGISTER:
2772 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2773 idev = ipv6_add_dev(dev);
2775 return notifier_from_errno(-ENOMEM);
2781 if (dev->flags & IFF_SLAVE)
2784 if (event == NETDEV_UP) {
2785 if (!addrconf_qdisc_ok(dev)) {
2786 /* device is not ready yet. */
2787 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
2792 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2793 idev = ipv6_add_dev(dev);
2796 idev->if_flags |= IF_READY;
2800 if (!addrconf_qdisc_ok(dev)) {
2801 /* device is still not ready. */
2806 if (idev->if_flags & IF_READY)
2807 /* device is already configured. */
2809 idev->if_flags |= IF_READY;
2812 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
2818 switch (dev->type) {
2819 #if IS_ENABLED(CONFIG_IPV6_SIT)
2821 addrconf_sit_config(dev);
2824 #if IS_ENABLED(CONFIG_NET_IPGRE)
2826 addrconf_gre_config(dev);
2829 case ARPHRD_LOOPBACK:
2834 addrconf_dev_config(dev);
2840 addrconf_dad_run(idev);
2843 * If the MTU changed during the interface down,
2844 * when the interface up, the changed MTU must be
2845 * reflected in the idev as well as routers.
2847 if (idev->cnf.mtu6 != dev->mtu &&
2848 dev->mtu >= IPV6_MIN_MTU) {
2849 rt6_mtu_change(dev, dev->mtu);
2850 idev->cnf.mtu6 = dev->mtu;
2852 idev->tstamp = jiffies;
2853 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2856 * If the changed mtu during down is lower than
2857 * IPV6_MIN_MTU stop IPv6 on this interface.
2859 if (dev->mtu < IPV6_MIN_MTU)
2860 addrconf_ifdown(dev, 1);
2864 case NETDEV_CHANGEMTU:
2865 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2866 rt6_mtu_change(dev, dev->mtu);
2867 idev->cnf.mtu6 = dev->mtu;
2871 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2872 idev = ipv6_add_dev(dev);
2878 * MTU falled under IPV6_MIN_MTU.
2879 * Stop IPv6 on this interface.
2883 case NETDEV_UNREGISTER:
2885 * Remove all addresses from this interface.
2887 addrconf_ifdown(dev, event != NETDEV_DOWN);
2890 case NETDEV_CHANGENAME:
2892 snmp6_unregister_dev(idev);
2893 addrconf_sysctl_unregister(idev);
2894 addrconf_sysctl_register(idev);
2895 err = snmp6_register_dev(idev);
2897 return notifier_from_errno(err);
2901 case NETDEV_PRE_TYPE_CHANGE:
2902 case NETDEV_POST_TYPE_CHANGE:
2903 addrconf_type_change(dev, event);
2911 * addrconf module should be notified of a device going up
2913 static struct notifier_block ipv6_dev_notf = {
2914 .notifier_call = addrconf_notify,
2917 static void addrconf_type_change(struct net_device *dev, unsigned long event)
2919 struct inet6_dev *idev;
2922 idev = __in6_dev_get(dev);
2924 if (event == NETDEV_POST_TYPE_CHANGE)
2925 ipv6_mc_remap(idev);
2926 else if (event == NETDEV_PRE_TYPE_CHANGE)
2927 ipv6_mc_unmap(idev);
2930 static int addrconf_ifdown(struct net_device *dev, int how)
2932 struct net *net = dev_net(dev);
2933 struct inet6_dev *idev;
2934 struct inet6_ifaddr *ifa;
2939 rt6_ifdown(net, dev);
2940 neigh_ifdown(&nd_tbl, dev);
2942 idev = __in6_dev_get(dev);
2947 * Step 1: remove reference to ipv6 device from parent device.
2953 /* protected by rtnl_lock */
2954 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
2956 /* Step 1.5: remove snmp6 entry */
2957 snmp6_unregister_dev(idev);
2961 /* Step 2: clear hash table */
2962 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
2963 struct hlist_head *h = &inet6_addr_lst[i];
2965 spin_lock_bh(&addrconf_hash_lock);
2967 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
2968 if (ifa->idev == idev) {
2969 hlist_del_init_rcu(&ifa->addr_lst);
2970 addrconf_del_dad_timer(ifa);
2974 spin_unlock_bh(&addrconf_hash_lock);
2977 write_lock_bh(&idev->lock);
2979 addrconf_del_rs_timer(idev);
2981 /* Step 2: clear flags for stateless addrconf */
2983 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2985 if (how && del_timer(&idev->regen_timer))
2988 /* Step 3: clear tempaddr list */
2989 while (!list_empty(&idev->tempaddr_list)) {
2990 ifa = list_first_entry(&idev->tempaddr_list,
2991 struct inet6_ifaddr, tmp_list);
2992 list_del(&ifa->tmp_list);
2993 write_unlock_bh(&idev->lock);
2994 spin_lock_bh(&ifa->lock);
2997 in6_ifa_put(ifa->ifpub);
3000 spin_unlock_bh(&ifa->lock);
3002 write_lock_bh(&idev->lock);
3005 while (!list_empty(&idev->addr_list)) {
3006 ifa = list_first_entry(&idev->addr_list,
3007 struct inet6_ifaddr, if_list);
3008 addrconf_del_dad_timer(ifa);
3010 list_del(&ifa->if_list);
3012 write_unlock_bh(&idev->lock);
3014 spin_lock_bh(&ifa->state_lock);
3016 ifa->state = INET6_IFADDR_STATE_DEAD;
3017 spin_unlock_bh(&ifa->state_lock);
3019 if (state != INET6_IFADDR_STATE_DEAD) {
3020 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3021 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3025 write_lock_bh(&idev->lock);
3028 write_unlock_bh(&idev->lock);
3030 /* Step 5: Discard multicast list */
3032 ipv6_mc_destroy_dev(idev);
3036 idev->tstamp = jiffies;
3038 /* Last: Shot the device (if unregistered) */
3040 addrconf_sysctl_unregister(idev);
3041 neigh_parms_release(&nd_tbl, idev->nd_parms);
3042 neigh_ifdown(&nd_tbl, dev);
3048 static void addrconf_rs_timer(unsigned long data)
3050 struct inet6_dev *idev = (struct inet6_dev *)data;
3051 struct net_device *dev = idev->dev;
3052 struct in6_addr lladdr;
3054 write_lock(&idev->lock);
3055 if (idev->dead || !(idev->if_flags & IF_READY))
3058 if (!ipv6_accept_ra(idev))
3061 /* Announcement received after solicitation was sent */
3062 if (idev->if_flags & IF_RA_RCVD)
3065 if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
3066 write_unlock(&idev->lock);
3067 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3068 ndisc_send_rs(dev, &lladdr,
3069 &in6addr_linklocal_allrouters);
3073 write_lock(&idev->lock);
3074 /* The wait after the last probe can be shorter */
3075 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3076 idev->cnf.rtr_solicits) ?
3077 idev->cnf.rtr_solicit_delay :
3078 idev->cnf.rtr_solicit_interval);
3081 * Note: we do not support deprecated "all on-link"
3082 * assumption any longer.
3084 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3088 write_unlock(&idev->lock);
3094 * Duplicate Address Detection
3096 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3098 unsigned long rand_num;
3099 struct inet6_dev *idev = ifp->idev;
3101 if (ifp->flags & IFA_F_OPTIMISTIC)
3104 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
3106 ifp->dad_probes = idev->cnf.dad_transmits;
3107 addrconf_mod_dad_timer(ifp, rand_num);
3110 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3112 struct inet6_dev *idev = ifp->idev;
3113 struct net_device *dev = idev->dev;
3115 addrconf_join_solict(dev, &ifp->addr);
3117 net_srandom(ifp->addr.s6_addr32[3]);
3119 read_lock_bh(&idev->lock);
3120 spin_lock(&ifp->lock);
3121 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3124 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3125 idev->cnf.accept_dad < 1 ||
3126 !(ifp->flags&IFA_F_TENTATIVE) ||
3127 ifp->flags & IFA_F_NODAD) {
3128 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3129 spin_unlock(&ifp->lock);
3130 read_unlock_bh(&idev->lock);
3132 addrconf_dad_completed(ifp);
3136 if (!(idev->if_flags & IF_READY)) {
3137 spin_unlock(&ifp->lock);
3138 read_unlock_bh(&idev->lock);
3140 * If the device is not ready:
3141 * - keep it tentative if it is a permanent address.
3142 * - otherwise, kill it.
3145 addrconf_dad_stop(ifp, 0);
3150 * Optimistic nodes can start receiving
3153 if (ifp->flags & IFA_F_OPTIMISTIC)
3154 ip6_ins_rt(ifp->rt);
3156 addrconf_dad_kick(ifp);
3158 spin_unlock(&ifp->lock);
3159 read_unlock_bh(&idev->lock);
3162 static void addrconf_dad_timer(unsigned long data)
3164 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
3165 struct inet6_dev *idev = ifp->idev;
3166 struct in6_addr mcaddr;
3168 if (!ifp->dad_probes && addrconf_dad_end(ifp))
3171 write_lock(&idev->lock);
3172 if (idev->dead || !(idev->if_flags & IF_READY)) {
3173 write_unlock(&idev->lock);
3177 spin_lock(&ifp->lock);
3178 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3179 spin_unlock(&ifp->lock);
3180 write_unlock(&idev->lock);
3184 if (ifp->dad_probes == 0) {
3186 * DAD was successful
3189 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3190 spin_unlock(&ifp->lock);
3191 write_unlock(&idev->lock);
3193 addrconf_dad_completed(ifp);
3199 addrconf_mod_dad_timer(ifp, ifp->idev->nd_parms->retrans_time);
3200 spin_unlock(&ifp->lock);
3201 write_unlock(&idev->lock);
3203 /* send a neighbour solicitation for our addr */
3204 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3205 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
3210 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3212 struct net_device *dev = ifp->idev->dev;
3213 struct in6_addr lladdr;
3214 bool send_rs, send_mld;
3216 addrconf_del_dad_timer(ifp);
3219 * Configure the address for reception. Now it is valid.
3222 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3224 /* If added prefix is link local and we are prepared to process
3225 router advertisements, start sending router solicitations.
3228 read_lock_bh(&ifp->idev->lock);
3229 spin_lock(&ifp->lock);
3230 send_mld = ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL &&
3231 ifp->idev->valid_ll_addr_cnt == 1;
3232 send_rs = send_mld &&
3233 ipv6_accept_ra(ifp->idev) &&
3234 ifp->idev->cnf.rtr_solicits > 0 &&
3235 (dev->flags&IFF_LOOPBACK) == 0;
3236 spin_unlock(&ifp->lock);
3237 read_unlock_bh(&ifp->idev->lock);
3239 /* While dad is in progress mld report's source address is in6_addrany.
3240 * Resend with proper ll now.
3243 ipv6_mc_dad_complete(ifp->idev);
3247 * If a host as already performed a random delay
3248 * [...] as part of DAD [...] there is no need
3249 * to delay again before sending the first RS
3251 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3253 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
3255 write_lock_bh(&ifp->idev->lock);
3256 spin_lock(&ifp->lock);
3257 ifp->idev->rs_probes = 1;
3258 ifp->idev->if_flags |= IF_RS_SENT;
3259 addrconf_mod_rs_timer(ifp->idev,
3260 ifp->idev->cnf.rtr_solicit_interval);
3261 spin_unlock(&ifp->lock);
3262 write_unlock_bh(&ifp->idev->lock);
3266 static void addrconf_dad_run(struct inet6_dev *idev)
3268 struct inet6_ifaddr *ifp;
3270 read_lock_bh(&idev->lock);
3271 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3272 spin_lock(&ifp->lock);
3273 if (ifp->flags & IFA_F_TENTATIVE &&
3274 ifp->state == INET6_IFADDR_STATE_DAD)
3275 addrconf_dad_kick(ifp);
3276 spin_unlock(&ifp->lock);
3278 read_unlock_bh(&idev->lock);
3281 #ifdef CONFIG_PROC_FS
3282 struct if6_iter_state {
3283 struct seq_net_private p;
3288 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3290 struct inet6_ifaddr *ifa = NULL;
3291 struct if6_iter_state *state = seq->private;
3292 struct net *net = seq_file_net(seq);
3295 /* initial bucket if pos is 0 */
3301 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3302 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
3304 if (!net_eq(dev_net(ifa->idev->dev), net))
3306 /* sync with offset */
3307 if (p < state->offset) {
3315 /* prepare for next bucket */
3322 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3323 struct inet6_ifaddr *ifa)
3325 struct if6_iter_state *state = seq->private;
3326 struct net *net = seq_file_net(seq);
3328 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
3329 if (!net_eq(dev_net(ifa->idev->dev), net))
3335 while (++state->bucket < IN6_ADDR_HSIZE) {
3337 hlist_for_each_entry_rcu_bh(ifa,
3338 &inet6_addr_lst[state->bucket], addr_lst) {
3339 if (!net_eq(dev_net(ifa->idev->dev), net))
3349 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3353 return if6_get_first(seq, *pos);
3356 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3358 struct inet6_ifaddr *ifa;
3360 ifa = if6_get_next(seq, v);
3365 static void if6_seq_stop(struct seq_file *seq, void *v)
3368 rcu_read_unlock_bh();
3371 static int if6_seq_show(struct seq_file *seq, void *v)
3373 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3374 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3376 ifp->idev->dev->ifindex,
3380 ifp->idev->dev->name);
3384 static const struct seq_operations if6_seq_ops = {
3385 .start = if6_seq_start,
3386 .next = if6_seq_next,
3387 .show = if6_seq_show,
3388 .stop = if6_seq_stop,
3391 static int if6_seq_open(struct inode *inode, struct file *file)
3393 return seq_open_net(inode, file, &if6_seq_ops,
3394 sizeof(struct if6_iter_state));
3397 static const struct file_operations if6_fops = {
3398 .owner = THIS_MODULE,
3399 .open = if6_seq_open,
3401 .llseek = seq_lseek,
3402 .release = seq_release_net,
3405 static int __net_init if6_proc_net_init(struct net *net)
3407 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
3412 static void __net_exit if6_proc_net_exit(struct net *net)
3414 remove_proc_entry("if_inet6", net->proc_net);
3417 static struct pernet_operations if6_proc_net_ops = {
3418 .init = if6_proc_net_init,
3419 .exit = if6_proc_net_exit,
3422 int __init if6_proc_init(void)
3424 return register_pernet_subsys(&if6_proc_net_ops);
3427 void if6_proc_exit(void)
3429 unregister_pernet_subsys(&if6_proc_net_ops);
3431 #endif /* CONFIG_PROC_FS */
3433 #if IS_ENABLED(CONFIG_IPV6_MIP6)
3434 /* Check if address is a home address configured on any interface. */
3435 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3438 struct inet6_ifaddr *ifp = NULL;
3439 unsigned int hash = inet6_addr_hash(addr);
3442 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
3443 if (!net_eq(dev_net(ifp->idev->dev), net))
3445 if (ipv6_addr_equal(&ifp->addr, addr) &&
3446 (ifp->flags & IFA_F_HOMEADDRESS)) {
3451 rcu_read_unlock_bh();
3457 * Periodic address status verification
3460 static void addrconf_verify(unsigned long foo)
3462 unsigned long now, next, next_sec, next_sched;
3463 struct inet6_ifaddr *ifp;
3467 spin_lock(&addrconf_verify_lock);
3469 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3471 del_timer(&addr_chk_timer);
3473 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3475 hlist_for_each_entry_rcu_bh(ifp,
3476 &inet6_addr_lst[i], addr_lst) {
3479 if (ifp->flags & IFA_F_PERMANENT)
3482 spin_lock(&ifp->lock);
3483 /* We try to batch several events at once. */
3484 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3486 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3487 age >= ifp->valid_lft) {
3488 spin_unlock(&ifp->lock);
3492 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3493 spin_unlock(&ifp->lock);
3495 } else if (age >= ifp->prefered_lft) {
3496 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3499 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3501 ifp->flags |= IFA_F_DEPRECATED;
3504 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3505 next = ifp->tstamp + ifp->valid_lft * HZ;
3507 spin_unlock(&ifp->lock);
3512 ipv6_ifa_notify(0, ifp);
3516 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3517 !(ifp->flags&IFA_F_TENTATIVE)) {
3518 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3519 ifp->idev->cnf.dad_transmits *
3520 ifp->idev->nd_parms->retrans_time / HZ;
3522 if (age >= ifp->prefered_lft - regen_advance) {
3523 struct inet6_ifaddr *ifpub = ifp->ifpub;
3524 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3525 next = ifp->tstamp + ifp->prefered_lft * HZ;
3526 if (!ifp->regen_count && ifpub) {
3529 in6_ifa_hold(ifpub);
3530 spin_unlock(&ifp->lock);
3532 spin_lock(&ifpub->lock);
3533 ifpub->regen_count = 0;
3534 spin_unlock(&ifpub->lock);
3535 ipv6_create_tempaddr(ifpub, ifp);
3540 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3541 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3542 spin_unlock(&ifp->lock);
3544 /* ifp->prefered_lft <= ifp->valid_lft */
3545 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3546 next = ifp->tstamp + ifp->prefered_lft * HZ;
3547 spin_unlock(&ifp->lock);
3552 next_sec = round_jiffies_up(next);
3555 /* If rounded timeout is accurate enough, accept it. */
3556 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3557 next_sched = next_sec;
3559 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3560 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3561 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3563 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3564 now, next, next_sec, next_sched);
3566 addr_chk_timer.expires = next_sched;
3567 add_timer(&addr_chk_timer);
3568 spin_unlock(&addrconf_verify_lock);
3569 rcu_read_unlock_bh();
3572 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
3573 struct in6_addr **peer_pfx)
3575 struct in6_addr *pfx = NULL;
3580 pfx = nla_data(addr);
3583 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3585 pfx = nla_data(local);
3591 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3592 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3593 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3594 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3598 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
3600 struct net *net = sock_net(skb->sk);
3601 struct ifaddrmsg *ifm;
3602 struct nlattr *tb[IFA_MAX+1];
3603 struct in6_addr *pfx, *peer_pfx;
3606 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3610 ifm = nlmsg_data(nlh);
3611 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
3615 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3618 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3619 u32 prefered_lft, u32 valid_lft)
3623 unsigned long timeout;
3625 if (!valid_lft || (prefered_lft > valid_lft))
3628 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3629 if (addrconf_finite_timeout(timeout)) {
3630 expires = jiffies_to_clock_t(timeout * HZ);
3631 valid_lft = timeout;
3632 flags = RTF_EXPIRES;
3636 ifa_flags |= IFA_F_PERMANENT;
3639 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3640 if (addrconf_finite_timeout(timeout)) {
3642 ifa_flags |= IFA_F_DEPRECATED;
3643 prefered_lft = timeout;
3646 spin_lock_bh(&ifp->lock);
3647 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3648 ifp->tstamp = jiffies;
3649 ifp->valid_lft = valid_lft;
3650 ifp->prefered_lft = prefered_lft;
3652 spin_unlock_bh(&ifp->lock);
3653 if (!(ifp->flags&IFA_F_TENTATIVE))
3654 ipv6_ifa_notify(0, ifp);
3656 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3664 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
3666 struct net *net = sock_net(skb->sk);
3667 struct ifaddrmsg *ifm;
3668 struct nlattr *tb[IFA_MAX+1];
3669 struct in6_addr *pfx, *peer_pfx;
3670 struct inet6_ifaddr *ifa;
3671 struct net_device *dev;
3672 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3676 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3680 ifm = nlmsg_data(nlh);
3681 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
3685 if (tb[IFA_CACHEINFO]) {
3686 struct ifa_cacheinfo *ci;
3688 ci = nla_data(tb[IFA_CACHEINFO]);
3689 valid_lft = ci->ifa_valid;
3690 preferred_lft = ci->ifa_prefered;
3692 preferred_lft = INFINITY_LIFE_TIME;
3693 valid_lft = INFINITY_LIFE_TIME;
3696 dev = __dev_get_by_index(net, ifm->ifa_index);
3700 /* We ignore other flags so far. */
3701 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3703 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3706 * It would be best to check for !NLM_F_CREATE here but
3707 * userspace alreay relies on not having to provide this.
3709 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
3710 ifm->ifa_prefixlen, ifa_flags,
3711 preferred_lft, valid_lft);
3714 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3715 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3718 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3725 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3726 u8 scope, int ifindex)
3728 struct ifaddrmsg *ifm;
3730 ifm = nlmsg_data(nlh);
3731 ifm->ifa_family = AF_INET6;
3732 ifm->ifa_prefixlen = prefixlen;
3733 ifm->ifa_flags = flags;
3734 ifm->ifa_scope = scope;
3735 ifm->ifa_index = ifindex;
3738 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3739 unsigned long tstamp, u32 preferred, u32 valid)
3741 struct ifa_cacheinfo ci;
3743 ci.cstamp = cstamp_delta(cstamp);
3744 ci.tstamp = cstamp_delta(tstamp);
3745 ci.ifa_prefered = preferred;
3746 ci.ifa_valid = valid;
3748 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3751 static inline int rt_scope(int ifa_scope)
3753 if (ifa_scope & IFA_HOST)
3754 return RT_SCOPE_HOST;
3755 else if (ifa_scope & IFA_LINK)
3756 return RT_SCOPE_LINK;
3757 else if (ifa_scope & IFA_SITE)
3758 return RT_SCOPE_SITE;
3760 return RT_SCOPE_UNIVERSE;
3763 static inline int inet6_ifaddr_msgsize(void)
3765 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3766 + nla_total_size(16) /* IFA_LOCAL */
3767 + nla_total_size(16) /* IFA_ADDRESS */
3768 + nla_total_size(sizeof(struct ifa_cacheinfo));
3771 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3772 u32 portid, u32 seq, int event, unsigned int flags)
3774 struct nlmsghdr *nlh;
3775 u32 preferred, valid;
3777 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3781 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3782 ifa->idev->dev->ifindex);
3784 if (!(ifa->flags&IFA_F_PERMANENT)) {
3785 preferred = ifa->prefered_lft;
3786 valid = ifa->valid_lft;
3787 if (preferred != INFINITY_LIFE_TIME) {
3788 long tval = (jiffies - ifa->tstamp)/HZ;
3789 if (preferred > tval)
3793 if (valid != INFINITY_LIFE_TIME) {
3801 preferred = INFINITY_LIFE_TIME;
3802 valid = INFINITY_LIFE_TIME;
3805 if (!ipv6_addr_any(&ifa->peer_addr)) {
3806 if (nla_put(skb, IFA_LOCAL, 16, &ifa->addr) < 0 ||
3807 nla_put(skb, IFA_ADDRESS, 16, &ifa->peer_addr) < 0)
3810 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0)
3813 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
3816 return nlmsg_end(skb, nlh);
3819 nlmsg_cancel(skb, nlh);
3823 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3824 u32 portid, u32 seq, int event, u16 flags)
3826 struct nlmsghdr *nlh;
3827 u8 scope = RT_SCOPE_UNIVERSE;
3828 int ifindex = ifmca->idev->dev->ifindex;
3830 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3831 scope = RT_SCOPE_SITE;
3833 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3837 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3838 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3839 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3840 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3841 nlmsg_cancel(skb, nlh);
3845 return nlmsg_end(skb, nlh);
3848 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3849 u32 portid, u32 seq, int event, unsigned int flags)
3851 struct nlmsghdr *nlh;
3852 u8 scope = RT_SCOPE_UNIVERSE;
3853 int ifindex = ifaca->aca_idev->dev->ifindex;
3855 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3856 scope = RT_SCOPE_SITE;
3858 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3862 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3863 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3864 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3865 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3866 nlmsg_cancel(skb, nlh);
3870 return nlmsg_end(skb, nlh);
3879 /* called with rcu_read_lock() */
3880 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3881 struct netlink_callback *cb, enum addr_type_t type,
3882 int s_ip_idx, int *p_ip_idx)
3884 struct ifmcaddr6 *ifmca;
3885 struct ifacaddr6 *ifaca;
3887 int ip_idx = *p_ip_idx;
3889 read_lock_bh(&idev->lock);
3891 case UNICAST_ADDR: {
3892 struct inet6_ifaddr *ifa;
3894 /* unicast address incl. temp addr */
3895 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3896 if (++ip_idx < s_ip_idx)
3898 err = inet6_fill_ifaddr(skb, ifa,
3899 NETLINK_CB(cb->skb).portid,
3905 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3909 case MULTICAST_ADDR:
3910 /* multicast address */
3911 for (ifmca = idev->mc_list; ifmca;
3912 ifmca = ifmca->next, ip_idx++) {
3913 if (ip_idx < s_ip_idx)
3915 err = inet6_fill_ifmcaddr(skb, ifmca,
3916 NETLINK_CB(cb->skb).portid,
3925 /* anycast address */
3926 for (ifaca = idev->ac_list; ifaca;
3927 ifaca = ifaca->aca_next, ip_idx++) {
3928 if (ip_idx < s_ip_idx)
3930 err = inet6_fill_ifacaddr(skb, ifaca,
3931 NETLINK_CB(cb->skb).portid,
3942 read_unlock_bh(&idev->lock);
3947 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3948 enum addr_type_t type)
3950 struct net *net = sock_net(skb->sk);
3953 int s_idx, s_ip_idx;
3954 struct net_device *dev;
3955 struct inet6_dev *idev;
3956 struct hlist_head *head;
3959 s_idx = idx = cb->args[1];
3960 s_ip_idx = ip_idx = cb->args[2];
3963 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
3964 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3966 head = &net->dev_index_head[h];
3967 hlist_for_each_entry_rcu(dev, head, index_hlist) {
3970 if (h > s_h || idx > s_idx)
3973 idev = __in6_dev_get(dev);
3977 if (in6_dump_addrs(idev, skb, cb, type,
3978 s_ip_idx, &ip_idx) <= 0)
3988 cb->args[2] = ip_idx;
3993 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3995 enum addr_type_t type = UNICAST_ADDR;
3997 return inet6_dump_addr(skb, cb, type);
4000 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4002 enum addr_type_t type = MULTICAST_ADDR;
4004 return inet6_dump_addr(skb, cb, type);
4008 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4010 enum addr_type_t type = ANYCAST_ADDR;
4012 return inet6_dump_addr(skb, cb, type);
4015 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
4017 struct net *net = sock_net(in_skb->sk);
4018 struct ifaddrmsg *ifm;
4019 struct nlattr *tb[IFA_MAX+1];
4020 struct in6_addr *addr = NULL, *peer;
4021 struct net_device *dev = NULL;
4022 struct inet6_ifaddr *ifa;
4023 struct sk_buff *skb;
4026 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4030 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4036 ifm = nlmsg_data(nlh);
4038 dev = __dev_get_by_index(net, ifm->ifa_index);
4040 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4042 err = -EADDRNOTAVAIL;
4046 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4052 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4053 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4055 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4056 WARN_ON(err == -EMSGSIZE);
4060 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4067 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4069 struct sk_buff *skb;
4070 struct net *net = dev_net(ifa->idev->dev);
4073 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4077 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4079 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4080 WARN_ON(err == -EMSGSIZE);
4084 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4088 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4091 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4092 __s32 *array, int bytes)
4094 BUG_ON(bytes < (DEVCONF_MAX * 4));
4096 memset(array, 0, bytes);
4097 array[DEVCONF_FORWARDING] = cnf->forwarding;
4098 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4099 array[DEVCONF_MTU6] = cnf->mtu6;
4100 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4101 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4102 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4103 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4104 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4105 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4106 jiffies_to_msecs(cnf->rtr_solicit_interval);
4107 array[DEVCONF_RTR_SOLICIT_DELAY] =
4108 jiffies_to_msecs(cnf->rtr_solicit_delay);
4109 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4110 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4111 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4112 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4113 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
4114 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4115 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4116 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4117 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4118 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4119 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4120 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4121 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4122 #ifdef CONFIG_IPV6_ROUTER_PREF
4123 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4124 array[DEVCONF_RTR_PROBE_INTERVAL] =
4125 jiffies_to_msecs(cnf->rtr_probe_interval);
4126 #ifdef CONFIG_IPV6_ROUTE_INFO
4127 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4130 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4131 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4132 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4133 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4135 #ifdef CONFIG_IPV6_MROUTE
4136 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4138 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4139 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4140 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4141 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4142 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
4145 static inline size_t inet6_ifla6_size(void)
4147 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4148 + nla_total_size(sizeof(struct ifla_cacheinfo))
4149 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4150 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4151 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4152 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
4155 static inline size_t inet6_if_nlmsg_size(void)
4157 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4158 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4159 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4160 + nla_total_size(4) /* IFLA_MTU */
4161 + nla_total_size(4) /* IFLA_LINK */
4162 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4165 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4166 int items, int bytes)
4169 int pad = bytes - sizeof(u64) * items;
4172 /* Use put_unaligned() because stats may not be aligned for u64. */
4173 put_unaligned(items, &stats[0]);
4174 for (i = 1; i < items; i++)
4175 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4177 memset(&stats[items], 0, pad);
4180 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
4181 int items, int bytes, size_t syncpoff)
4184 int pad = bytes - sizeof(u64) * items;
4187 /* Use put_unaligned() because stats may not be aligned for u64. */
4188 put_unaligned(items, &stats[0]);
4189 for (i = 1; i < items; i++)
4190 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4192 memset(&stats[items], 0, pad);
4195 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4199 case IFLA_INET6_STATS:
4200 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
4201 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
4203 case IFLA_INET6_ICMP6STATS:
4204 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
4209 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4212 struct ifla_cacheinfo ci;
4214 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4215 goto nla_put_failure;
4216 ci.max_reasm_len = IPV6_MAXPLEN;
4217 ci.tstamp = cstamp_delta(idev->tstamp);
4218 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4219 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
4220 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4221 goto nla_put_failure;
4222 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4224 goto nla_put_failure;
4225 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4227 /* XXX - MC not implemented */
4229 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4231 goto nla_put_failure;
4232 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4234 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4236 goto nla_put_failure;
4237 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4239 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4241 goto nla_put_failure;
4242 read_lock_bh(&idev->lock);
4243 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4244 read_unlock_bh(&idev->lock);
4252 static size_t inet6_get_link_af_size(const struct net_device *dev)
4254 if (!__in6_dev_get(dev))
4257 return inet6_ifla6_size();
4260 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4262 struct inet6_dev *idev = __in6_dev_get(dev);
4267 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4273 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4275 struct inet6_ifaddr *ifp;
4276 struct net_device *dev = idev->dev;
4277 bool update_rs = false;
4278 struct in6_addr ll_addr;
4282 if (ipv6_addr_any(token))
4284 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4286 if (!ipv6_accept_ra(idev))
4288 if (idev->cnf.rtr_solicits <= 0)
4291 write_lock_bh(&idev->lock);
4293 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4294 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4296 write_unlock_bh(&idev->lock);
4298 if (!idev->dead && (idev->if_flags & IF_READY) &&
4299 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4300 IFA_F_OPTIMISTIC)) {
4302 /* If we're not ready, then normal ifup will take care
4303 * of this. Otherwise, we need to request our rs here.
4305 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4309 write_lock_bh(&idev->lock);
4312 idev->if_flags |= IF_RS_SENT;
4313 idev->rs_probes = 1;
4314 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
4317 /* Well, that's kinda nasty ... */
4318 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4319 spin_lock(&ifp->lock);
4320 if (ifp->tokenized) {
4322 ifp->prefered_lft = 0;
4324 spin_unlock(&ifp->lock);
4327 write_unlock_bh(&idev->lock);
4332 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4335 struct inet6_dev *idev = __in6_dev_get(dev);
4336 struct nlattr *tb[IFLA_INET6_MAX + 1];
4339 return -EAFNOSUPPORT;
4341 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4344 if (tb[IFLA_INET6_TOKEN])
4345 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
4350 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4351 u32 portid, u32 seq, int event, unsigned int flags)
4353 struct net_device *dev = idev->dev;
4354 struct ifinfomsg *hdr;
4355 struct nlmsghdr *nlh;
4358 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
4362 hdr = nlmsg_data(nlh);
4363 hdr->ifi_family = AF_INET6;
4365 hdr->ifi_type = dev->type;
4366 hdr->ifi_index = dev->ifindex;
4367 hdr->ifi_flags = dev_get_flags(dev);
4368 hdr->ifi_change = 0;
4370 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4372 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4373 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4374 (dev->ifindex != dev->iflink &&
4375 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4376 goto nla_put_failure;
4377 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4378 if (protoinfo == NULL)
4379 goto nla_put_failure;
4381 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4382 goto nla_put_failure;
4384 nla_nest_end(skb, protoinfo);
4385 return nlmsg_end(skb, nlh);
4388 nlmsg_cancel(skb, nlh);
4392 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4394 struct net *net = sock_net(skb->sk);
4397 struct net_device *dev;
4398 struct inet6_dev *idev;
4399 struct hlist_head *head;
4402 s_idx = cb->args[1];
4405 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4407 head = &net->dev_index_head[h];
4408 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4411 idev = __in6_dev_get(dev);
4414 if (inet6_fill_ifinfo(skb, idev,
4415 NETLINK_CB(cb->skb).portid,
4417 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4431 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4433 struct sk_buff *skb;
4434 struct net *net = dev_net(idev->dev);
4437 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4441 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4443 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4444 WARN_ON(err == -EMSGSIZE);
4448 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4452 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4455 static inline size_t inet6_prefix_nlmsg_size(void)
4457 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4458 + nla_total_size(sizeof(struct in6_addr))
4459 + nla_total_size(sizeof(struct prefix_cacheinfo));
4462 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4463 struct prefix_info *pinfo, u32 portid, u32 seq,
4464 int event, unsigned int flags)
4466 struct prefixmsg *pmsg;
4467 struct nlmsghdr *nlh;
4468 struct prefix_cacheinfo ci;
4470 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
4474 pmsg = nlmsg_data(nlh);
4475 pmsg->prefix_family = AF_INET6;
4476 pmsg->prefix_pad1 = 0;
4477 pmsg->prefix_pad2 = 0;
4478 pmsg->prefix_ifindex = idev->dev->ifindex;
4479 pmsg->prefix_len = pinfo->prefix_len;
4480 pmsg->prefix_type = pinfo->type;
4481 pmsg->prefix_pad3 = 0;
4482 pmsg->prefix_flags = 0;
4484 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4485 if (pinfo->autoconf)
4486 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4488 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4489 goto nla_put_failure;
4490 ci.preferred_time = ntohl(pinfo->prefered);
4491 ci.valid_time = ntohl(pinfo->valid);
4492 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4493 goto nla_put_failure;
4494 return nlmsg_end(skb, nlh);
4497 nlmsg_cancel(skb, nlh);
4501 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4502 struct prefix_info *pinfo)
4504 struct sk_buff *skb;
4505 struct net *net = dev_net(idev->dev);
4508 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4512 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4514 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4515 WARN_ON(err == -EMSGSIZE);
4519 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4523 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4526 static void update_valid_ll_addr_cnt(struct inet6_ifaddr *ifp, int count)
4528 write_lock_bh(&ifp->idev->lock);
4529 spin_lock(&ifp->lock);
4530 if (((ifp->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|
4531 IFA_F_DADFAILED)) == IFA_F_PERMANENT) &&
4532 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL))
4533 ifp->idev->valid_ll_addr_cnt += count;
4534 WARN_ON(ifp->idev->valid_ll_addr_cnt < 0);
4535 spin_unlock(&ifp->lock);
4536 write_unlock_bh(&ifp->idev->lock);
4539 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4541 struct net *net = dev_net(ifp->idev->dev);
4543 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4547 update_valid_ll_addr_cnt(ifp, 1);
4550 * If the address was optimistic
4551 * we inserted the route at the start of
4552 * our DAD process, so we don't need
4555 if (!(ifp->rt->rt6i_node))
4556 ip6_ins_rt(ifp->rt);
4557 if (ifp->idev->cnf.forwarding)
4558 addrconf_join_anycast(ifp);
4559 if (!ipv6_addr_any(&ifp->peer_addr))
4560 addrconf_prefix_route(&ifp->peer_addr, 128,
4561 ifp->idev->dev, 0, 0);
4564 update_valid_ll_addr_cnt(ifp, -1);
4566 if (ifp->idev->cnf.forwarding)
4567 addrconf_leave_anycast(ifp);
4568 addrconf_leave_solict(ifp->idev, &ifp->addr);
4569 if (!ipv6_addr_any(&ifp->peer_addr)) {
4570 struct rt6_info *rt;
4571 struct net_device *dev = ifp->idev->dev;
4573 rt = rt6_lookup(dev_net(dev), &ifp->peer_addr, NULL,
4581 dst_hold(&ifp->rt->dst);
4583 if (ip6_del_rt(ifp->rt))
4584 dst_free(&ifp->rt->dst);
4587 atomic_inc(&net->ipv6.dev_addr_genid);
4588 rt_genid_bump_ipv6(net);
4591 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4594 if (likely(ifp->idev->dead == 0))
4595 __ipv6_ifa_notify(event, ifp);
4596 rcu_read_unlock_bh();
4599 #ifdef CONFIG_SYSCTL
4602 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
4603 void __user *buffer, size_t *lenp, loff_t *ppos)
4605 int *valp = ctl->data;
4608 struct ctl_table lctl;
4612 * ctl->data points to idev->cnf.forwarding, we should
4613 * not modify it until we get the rtnl lock.
4618 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4621 ret = addrconf_fixup_forwarding(ctl, valp, val);
4627 static void dev_disable_change(struct inet6_dev *idev)
4629 struct netdev_notifier_info info;
4631 if (!idev || !idev->dev)
4634 netdev_notifier_info_init(&info, idev->dev);
4635 if (idev->cnf.disable_ipv6)
4636 addrconf_notify(NULL, NETDEV_DOWN, &info);
4638 addrconf_notify(NULL, NETDEV_UP, &info);
4641 static void addrconf_disable_change(struct net *net, __s32 newf)
4643 struct net_device *dev;
4644 struct inet6_dev *idev;
4647 for_each_netdev_rcu(net, dev) {
4648 idev = __in6_dev_get(dev);
4650 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4651 idev->cnf.disable_ipv6 = newf;
4653 dev_disable_change(idev);
4659 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
4664 if (!rtnl_trylock())
4665 return restart_syscall();
4667 net = (struct net *)table->extra2;
4671 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4676 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4677 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4678 addrconf_disable_change(net, newf);
4679 } else if ((!newf) ^ (!old))
4680 dev_disable_change((struct inet6_dev *)table->extra1);
4687 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
4688 void __user *buffer, size_t *lenp, loff_t *ppos)
4690 int *valp = ctl->data;
4693 struct ctl_table lctl;
4697 * ctl->data points to idev->cnf.disable_ipv6, we should
4698 * not modify it until we get the rtnl lock.
4703 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4706 ret = addrconf_disable_ipv6(ctl, valp, val);
4712 static struct addrconf_sysctl_table
4714 struct ctl_table_header *sysctl_header;
4715 struct ctl_table addrconf_vars[DEVCONF_MAX+1];
4716 } addrconf_sysctl __read_mostly = {
4717 .sysctl_header = NULL,
4720 .procname = "forwarding",
4721 .data = &ipv6_devconf.forwarding,
4722 .maxlen = sizeof(int),
4724 .proc_handler = addrconf_sysctl_forward,
4727 .procname = "hop_limit",
4728 .data = &ipv6_devconf.hop_limit,
4729 .maxlen = sizeof(int),
4731 .proc_handler = proc_dointvec,
4735 .data = &ipv6_devconf.mtu6,
4736 .maxlen = sizeof(int),
4738 .proc_handler = proc_dointvec,
4741 .procname = "accept_ra",
4742 .data = &ipv6_devconf.accept_ra,
4743 .maxlen = sizeof(int),
4745 .proc_handler = proc_dointvec,
4748 .procname = "accept_redirects",
4749 .data = &ipv6_devconf.accept_redirects,
4750 .maxlen = sizeof(int),
4752 .proc_handler = proc_dointvec,
4755 .procname = "autoconf",
4756 .data = &ipv6_devconf.autoconf,
4757 .maxlen = sizeof(int),
4759 .proc_handler = proc_dointvec,
4762 .procname = "dad_transmits",
4763 .data = &ipv6_devconf.dad_transmits,
4764 .maxlen = sizeof(int),
4766 .proc_handler = proc_dointvec,
4769 .procname = "router_solicitations",
4770 .data = &ipv6_devconf.rtr_solicits,
4771 .maxlen = sizeof(int),
4773 .proc_handler = proc_dointvec,
4776 .procname = "router_solicitation_interval",
4777 .data = &ipv6_devconf.rtr_solicit_interval,
4778 .maxlen = sizeof(int),
4780 .proc_handler = proc_dointvec_jiffies,
4783 .procname = "router_solicitation_delay",
4784 .data = &ipv6_devconf.rtr_solicit_delay,
4785 .maxlen = sizeof(int),
4787 .proc_handler = proc_dointvec_jiffies,
4790 .procname = "force_mld_version",
4791 .data = &ipv6_devconf.force_mld_version,
4792 .maxlen = sizeof(int),
4794 .proc_handler = proc_dointvec,
4797 .procname = "mldv1_unsolicited_report_interval",
4799 &ipv6_devconf.mldv1_unsolicited_report_interval,
4800 .maxlen = sizeof(int),
4802 .proc_handler = proc_dointvec_ms_jiffies,
4805 .procname = "mldv2_unsolicited_report_interval",
4807 &ipv6_devconf.mldv2_unsolicited_report_interval,
4808 .maxlen = sizeof(int),
4810 .proc_handler = proc_dointvec_ms_jiffies,
4813 .procname = "use_tempaddr",
4814 .data = &ipv6_devconf.use_tempaddr,
4815 .maxlen = sizeof(int),
4817 .proc_handler = proc_dointvec,
4820 .procname = "temp_valid_lft",
4821 .data = &ipv6_devconf.temp_valid_lft,
4822 .maxlen = sizeof(int),
4824 .proc_handler = proc_dointvec,
4827 .procname = "temp_prefered_lft",
4828 .data = &ipv6_devconf.temp_prefered_lft,
4829 .maxlen = sizeof(int),
4831 .proc_handler = proc_dointvec,
4834 .procname = "regen_max_retry",
4835 .data = &ipv6_devconf.regen_max_retry,
4836 .maxlen = sizeof(int),
4838 .proc_handler = proc_dointvec,
4841 .procname = "max_desync_factor",
4842 .data = &ipv6_devconf.max_desync_factor,
4843 .maxlen = sizeof(int),
4845 .proc_handler = proc_dointvec,
4848 .procname = "max_addresses",
4849 .data = &ipv6_devconf.max_addresses,
4850 .maxlen = sizeof(int),
4852 .proc_handler = proc_dointvec,
4855 .procname = "accept_ra_defrtr",
4856 .data = &ipv6_devconf.accept_ra_defrtr,
4857 .maxlen = sizeof(int),
4859 .proc_handler = proc_dointvec,
4862 .procname = "accept_ra_pinfo",
4863 .data = &ipv6_devconf.accept_ra_pinfo,
4864 .maxlen = sizeof(int),
4866 .proc_handler = proc_dointvec,
4868 #ifdef CONFIG_IPV6_ROUTER_PREF
4870 .procname = "accept_ra_rtr_pref",
4871 .data = &ipv6_devconf.accept_ra_rtr_pref,
4872 .maxlen = sizeof(int),
4874 .proc_handler = proc_dointvec,
4877 .procname = "router_probe_interval",
4878 .data = &ipv6_devconf.rtr_probe_interval,
4879 .maxlen = sizeof(int),
4881 .proc_handler = proc_dointvec_jiffies,
4883 #ifdef CONFIG_IPV6_ROUTE_INFO
4885 .procname = "accept_ra_rt_info_max_plen",
4886 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4887 .maxlen = sizeof(int),
4889 .proc_handler = proc_dointvec,
4894 .procname = "proxy_ndp",
4895 .data = &ipv6_devconf.proxy_ndp,
4896 .maxlen = sizeof(int),
4898 .proc_handler = proc_dointvec,
4901 .procname = "accept_source_route",
4902 .data = &ipv6_devconf.accept_source_route,
4903 .maxlen = sizeof(int),
4905 .proc_handler = proc_dointvec,
4907 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4909 .procname = "optimistic_dad",
4910 .data = &ipv6_devconf.optimistic_dad,
4911 .maxlen = sizeof(int),
4913 .proc_handler = proc_dointvec,
4917 #ifdef CONFIG_IPV6_MROUTE
4919 .procname = "mc_forwarding",
4920 .data = &ipv6_devconf.mc_forwarding,
4921 .maxlen = sizeof(int),
4923 .proc_handler = proc_dointvec,
4927 .procname = "disable_ipv6",
4928 .data = &ipv6_devconf.disable_ipv6,
4929 .maxlen = sizeof(int),
4931 .proc_handler = addrconf_sysctl_disable,
4934 .procname = "accept_dad",
4935 .data = &ipv6_devconf.accept_dad,
4936 .maxlen = sizeof(int),
4938 .proc_handler = proc_dointvec,
4941 .procname = "force_tllao",
4942 .data = &ipv6_devconf.force_tllao,
4943 .maxlen = sizeof(int),
4945 .proc_handler = proc_dointvec
4948 .procname = "ndisc_notify",
4949 .data = &ipv6_devconf.ndisc_notify,
4950 .maxlen = sizeof(int),
4952 .proc_handler = proc_dointvec
4955 .procname = "suppress_frag_ndisc",
4956 .data = &ipv6_devconf.suppress_frag_ndisc,
4957 .maxlen = sizeof(int),
4959 .proc_handler = proc_dointvec
4967 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4968 struct inet6_dev *idev, struct ipv6_devconf *p)
4971 struct addrconf_sysctl_table *t;
4972 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
4974 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4978 for (i = 0; t->addrconf_vars[i].data; i++) {
4979 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
4980 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4981 t->addrconf_vars[i].extra2 = net;
4984 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
4986 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
4987 if (t->sysctl_header == NULL)
4999 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5001 struct addrconf_sysctl_table *t;
5003 if (p->sysctl == NULL)
5008 unregister_net_sysctl_table(t->sysctl_header);
5012 static void addrconf_sysctl_register(struct inet6_dev *idev)
5014 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
5015 &ndisc_ifinfo_sysctl_change);
5016 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
5020 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
5022 __addrconf_sysctl_unregister(&idev->cnf);
5023 neigh_sysctl_unregister(idev->nd_parms);
5029 static int __net_init addrconf_init_net(struct net *net)
5032 struct ipv6_devconf *all, *dflt;
5034 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
5038 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
5040 goto err_alloc_dflt;
5042 /* these will be inherited by all namespaces */
5043 dflt->autoconf = ipv6_defaults.autoconf;
5044 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
5046 net->ipv6.devconf_all = all;
5047 net->ipv6.devconf_dflt = dflt;
5049 #ifdef CONFIG_SYSCTL
5050 err = __addrconf_sysctl_register(net, "all", NULL, all);
5054 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
5060 #ifdef CONFIG_SYSCTL
5062 __addrconf_sysctl_unregister(all);
5072 static void __net_exit addrconf_exit_net(struct net *net)
5074 #ifdef CONFIG_SYSCTL
5075 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5076 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5078 if (!net_eq(net, &init_net)) {
5079 kfree(net->ipv6.devconf_dflt);
5080 kfree(net->ipv6.devconf_all);
5084 static struct pernet_operations addrconf_ops = {
5085 .init = addrconf_init_net,
5086 .exit = addrconf_exit_net,
5089 static struct rtnl_af_ops inet6_ops = {
5091 .fill_link_af = inet6_fill_link_af,
5092 .get_link_af_size = inet6_get_link_af_size,
5093 .set_link_af = inet6_set_link_af,
5097 * Init / cleanup code
5100 int __init addrconf_init(void)
5104 err = ipv6_addr_label_init();
5106 pr_crit("%s: cannot initialize default policy table: %d\n",
5111 err = register_pernet_subsys(&addrconf_ops);
5115 /* The addrconf netdev notifier requires that loopback_dev
5116 * has it's ipv6 private information allocated and setup
5117 * before it can bring up and give link-local addresses
5118 * to other devices which are up.
5120 * Unfortunately, loopback_dev is not necessarily the first
5121 * entry in the global dev_base list of net devices. In fact,
5122 * it is likely to be the very last entry on that list.
5123 * So this causes the notifier registry below to try and
5124 * give link-local addresses to all devices besides loopback_dev
5125 * first, then loopback_dev, which cases all the non-loopback_dev
5126 * devices to fail to get a link-local address.
5128 * So, as a temporary fix, allocate the ipv6 structure for
5129 * loopback_dev first by hand.
5130 * Longer term, all of the dependencies ipv6 has upon the loopback
5131 * device and it being up should be removed.
5134 if (!ipv6_add_dev(init_net.loopback_dev))
5140 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5141 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5143 register_netdevice_notifier(&ipv6_dev_notf);
5147 err = rtnl_af_register(&inet6_ops);
5151 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5156 /* Only the first call to __rtnl_register can fail */
5157 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5158 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5159 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5160 inet6_dump_ifaddr, NULL);
5161 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5162 inet6_dump_ifmcaddr, NULL);
5163 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5164 inet6_dump_ifacaddr, NULL);
5165 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
5166 inet6_netconf_dump_devconf, NULL);
5168 ipv6_addr_label_rtnl_register();
5172 rtnl_af_unregister(&inet6_ops);
5174 unregister_netdevice_notifier(&ipv6_dev_notf);
5176 unregister_pernet_subsys(&addrconf_ops);
5178 ipv6_addr_label_cleanup();
5183 void addrconf_cleanup(void)
5185 struct net_device *dev;
5188 unregister_netdevice_notifier(&ipv6_dev_notf);
5189 unregister_pernet_subsys(&addrconf_ops);
5190 ipv6_addr_label_cleanup();
5194 __rtnl_af_unregister(&inet6_ops);
5196 /* clean dev list */
5197 for_each_netdev(&init_net, dev) {
5198 if (__in6_dev_get(dev) == NULL)
5200 addrconf_ifdown(dev, 1);
5202 addrconf_ifdown(init_net.loopback_dev, 2);
5207 spin_lock_bh(&addrconf_hash_lock);
5208 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5209 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5210 spin_unlock_bh(&addrconf_hash_lock);
5212 del_timer(&addr_chk_timer);