2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
6 * Pedro Roque <roque@di.fc.ul.pt>
7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
25 * yoshfuji@USAGI : Fixed interval between DAD
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
41 #define pr_fmt(fmt) "IPv6: " fmt
43 #include <linux/errno.h>
44 #include <linux/types.h>
45 #include <linux/kernel.h>
46 #include <linux/socket.h>
47 #include <linux/sockios.h>
48 #include <linux/net.h>
49 #include <linux/in6.h>
50 #include <linux/netdevice.h>
51 #include <linux/if_addr.h>
52 #include <linux/if_arp.h>
53 #include <linux/if_arcnet.h>
54 #include <linux/if_infiniband.h>
55 #include <linux/route.h>
56 #include <linux/inetdevice.h>
57 #include <linux/init.h>
58 #include <linux/slab.h>
60 #include <linux/sysctl.h>
62 #include <linux/capability.h>
63 #include <linux/delay.h>
64 #include <linux/notifier.h>
65 #include <linux/string.h>
66 #include <linux/hash.h>
68 #include <net/net_namespace.h>
72 #include <net/af_ieee802154.h>
73 #include <net/firewire.h>
75 #include <net/protocol.h>
76 #include <net/ndisc.h>
77 #include <net/ip6_route.h>
78 #include <net/addrconf.h>
81 #include <net/netlink.h>
82 #include <net/pkt_sched.h>
83 #include <linux/if_tunnel.h>
84 #include <linux/rtnetlink.h>
85 #include <linux/netconf.h>
87 #ifdef CONFIG_IPV6_PRIVACY
88 #include <linux/random.h>
91 #include <linux/uaccess.h>
92 #include <asm/unaligned.h>
94 #include <linux/proc_fs.h>
95 #include <linux/seq_file.h>
96 #include <linux/export.h>
98 /* Set to 3 to get tracing... */
102 #define ADBG(x) printk x
107 #define INFINITY_LIFE_TIME 0xFFFFFFFF
109 static inline u32 cstamp_delta(unsigned long cstamp)
111 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
115 static void addrconf_sysctl_register(struct inet6_dev *idev);
116 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
118 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
122 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
127 #ifdef CONFIG_IPV6_PRIVACY
128 static void __ipv6_regen_rndid(struct inet6_dev *idev);
129 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
130 static void ipv6_regen_rndid(unsigned long data);
133 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
134 static int ipv6_count_addresses(struct inet6_dev *idev);
137 * Configured unicast address hash table
139 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
140 static DEFINE_SPINLOCK(addrconf_hash_lock);
142 static void addrconf_verify(unsigned long);
144 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
145 static DEFINE_SPINLOCK(addrconf_verify_lock);
147 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
148 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
150 static void addrconf_type_change(struct net_device *dev,
151 unsigned long event);
152 static int addrconf_ifdown(struct net_device *dev, int how);
154 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
156 const struct net_device *dev,
157 u32 flags, u32 noflags);
159 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
160 static void addrconf_dad_timer(unsigned long data);
161 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
162 static void addrconf_dad_run(struct inet6_dev *idev);
163 static void addrconf_rs_timer(unsigned long data);
164 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
165 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
167 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
168 struct prefix_info *pinfo);
169 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
170 struct net_device *dev);
172 static struct ipv6_devconf ipv6_devconf __read_mostly = {
174 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
175 .mtu6 = IPV6_MIN_MTU,
177 .accept_redirects = 1,
179 .force_mld_version = 0,
181 .rtr_solicits = MAX_RTR_SOLICITATIONS,
182 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
183 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
184 #ifdef CONFIG_IPV6_PRIVACY
186 .temp_valid_lft = TEMP_VALID_LIFETIME,
187 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
188 .regen_max_retry = REGEN_MAX_RETRY,
189 .max_desync_factor = MAX_DESYNC_FACTOR,
191 .max_addresses = IPV6_MAX_ADDRESSES,
192 .accept_ra_defrtr = 1,
193 .accept_ra_pinfo = 1,
194 #ifdef CONFIG_IPV6_ROUTER_PREF
195 .accept_ra_rtr_pref = 1,
196 .rtr_probe_interval = 60 * HZ,
197 #ifdef CONFIG_IPV6_ROUTE_INFO
198 .accept_ra_rt_info_max_plen = 0,
202 .accept_source_route = 0, /* we do not accept RH0 by default. */
207 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
209 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
210 .mtu6 = IPV6_MIN_MTU,
212 .accept_redirects = 1,
215 .rtr_solicits = MAX_RTR_SOLICITATIONS,
216 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
217 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
218 #ifdef CONFIG_IPV6_PRIVACY
220 .temp_valid_lft = TEMP_VALID_LIFETIME,
221 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
222 .regen_max_retry = REGEN_MAX_RETRY,
223 .max_desync_factor = MAX_DESYNC_FACTOR,
225 .max_addresses = IPV6_MAX_ADDRESSES,
226 .accept_ra_defrtr = 1,
227 .accept_ra_pinfo = 1,
228 #ifdef CONFIG_IPV6_ROUTER_PREF
229 .accept_ra_rtr_pref = 1,
230 .rtr_probe_interval = 60 * HZ,
231 #ifdef CONFIG_IPV6_ROUTE_INFO
232 .accept_ra_rt_info_max_plen = 0,
236 .accept_source_route = 0, /* we do not accept RH0 by default. */
241 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
242 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
243 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
244 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
245 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
246 const struct in6_addr in6addr_interfacelocal_allnodes = IN6ADDR_INTERFACELOCAL_ALLNODES_INIT;
247 const struct in6_addr in6addr_interfacelocal_allrouters = IN6ADDR_INTERFACELOCAL_ALLROUTERS_INIT;
248 const struct in6_addr in6addr_sitelocal_allrouters = IN6ADDR_SITELOCAL_ALLROUTERS_INIT;
250 /* Check if a valid qdisc is available */
251 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
253 return !qdisc_tx_is_noop(dev);
256 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
258 if (del_timer(&ifp->timer))
262 enum addrconf_timer_t {
268 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
269 enum addrconf_timer_t what,
272 if (!del_timer(&ifp->timer))
277 ifp->timer.function = addrconf_dad_timer;
280 ifp->timer.function = addrconf_rs_timer;
285 ifp->timer.expires = jiffies + when;
286 add_timer(&ifp->timer);
289 static int snmp6_alloc_dev(struct inet6_dev *idev)
291 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
292 sizeof(struct ipstats_mib),
293 __alignof__(struct ipstats_mib)) < 0)
295 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
297 if (!idev->stats.icmpv6dev)
299 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
301 if (!idev->stats.icmpv6msgdev)
307 kfree(idev->stats.icmpv6dev);
309 snmp_mib_free((void __percpu **)idev->stats.ipv6);
314 static void snmp6_free_dev(struct inet6_dev *idev)
316 kfree(idev->stats.icmpv6msgdev);
317 kfree(idev->stats.icmpv6dev);
318 snmp_mib_free((void __percpu **)idev->stats.ipv6);
321 /* Nobody refers to this device, we may destroy it. */
323 void in6_dev_finish_destroy(struct inet6_dev *idev)
325 struct net_device *dev = idev->dev;
327 WARN_ON(!list_empty(&idev->addr_list));
328 WARN_ON(idev->mc_list != NULL);
330 #ifdef NET_REFCNT_DEBUG
331 pr_debug("%s: %s\n", __func__, dev ? dev->name : "NIL");
335 pr_warn("Freeing alive inet6 device %p\n", idev);
338 snmp6_free_dev(idev);
339 kfree_rcu(idev, rcu);
341 EXPORT_SYMBOL(in6_dev_finish_destroy);
343 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
345 struct inet6_dev *ndev;
349 if (dev->mtu < IPV6_MIN_MTU)
352 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
357 rwlock_init(&ndev->lock);
359 INIT_LIST_HEAD(&ndev->addr_list);
361 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
362 ndev->cnf.mtu6 = dev->mtu;
363 ndev->cnf.sysctl = NULL;
364 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
365 if (ndev->nd_parms == NULL) {
369 if (ndev->cnf.forwarding)
370 dev_disable_lro(dev);
371 /* We refer to the device */
374 if (snmp6_alloc_dev(ndev) < 0) {
376 "%s: cannot allocate memory for statistics; dev=%s.\n",
377 __func__, dev->name));
378 neigh_parms_release(&nd_tbl, ndev->nd_parms);
384 if (snmp6_register_dev(ndev) < 0) {
386 "%s: cannot create /proc/net/dev_snmp6/%s\n",
387 __func__, dev->name));
388 neigh_parms_release(&nd_tbl, ndev->nd_parms);
390 in6_dev_finish_destroy(ndev);
394 /* One reference from device. We must do this before
395 * we invoke __ipv6_regen_rndid().
399 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
400 ndev->cnf.accept_dad = -1;
402 #if IS_ENABLED(CONFIG_IPV6_SIT)
403 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
404 pr_info("%s: Disabled Multicast RS\n", dev->name);
405 ndev->cnf.rtr_solicits = 0;
409 #ifdef CONFIG_IPV6_PRIVACY
410 INIT_LIST_HEAD(&ndev->tempaddr_list);
411 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
412 if ((dev->flags&IFF_LOOPBACK) ||
413 dev->type == ARPHRD_TUNNEL ||
414 dev->type == ARPHRD_TUNNEL6 ||
415 dev->type == ARPHRD_SIT ||
416 dev->type == ARPHRD_NONE) {
417 ndev->cnf.use_tempaddr = -1;
420 ipv6_regen_rndid((unsigned long) ndev);
423 ndev->token = in6addr_any;
425 if (netif_running(dev) && addrconf_qdisc_ok(dev))
426 ndev->if_flags |= IF_READY;
428 ipv6_mc_init_dev(ndev);
429 ndev->tstamp = jiffies;
430 addrconf_sysctl_register(ndev);
431 /* protected by rtnl_lock */
432 rcu_assign_pointer(dev->ip6_ptr, ndev);
434 /* Join interface-local all-node multicast group */
435 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
437 /* Join all-node multicast group */
438 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
440 /* Join all-router multicast group if forwarding is set */
441 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
442 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
447 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
449 struct inet6_dev *idev;
453 idev = __in6_dev_get(dev);
455 idev = ipv6_add_dev(dev);
460 if (dev->flags&IFF_UP)
465 static int inet6_netconf_msgsize_devconf(int type)
467 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
468 + nla_total_size(4); /* NETCONFA_IFINDEX */
470 /* type -1 is used for ALL */
471 if (type == -1 || type == NETCONFA_FORWARDING)
472 size += nla_total_size(4);
473 #ifdef CONFIG_IPV6_MROUTE
474 if (type == -1 || type == NETCONFA_MC_FORWARDING)
475 size += nla_total_size(4);
481 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
482 struct ipv6_devconf *devconf, u32 portid,
483 u32 seq, int event, unsigned int flags,
486 struct nlmsghdr *nlh;
487 struct netconfmsg *ncm;
489 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
494 ncm = nlmsg_data(nlh);
495 ncm->ncm_family = AF_INET6;
497 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
498 goto nla_put_failure;
500 /* type -1 is used for ALL */
501 if ((type == -1 || type == NETCONFA_FORWARDING) &&
502 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
503 goto nla_put_failure;
504 #ifdef CONFIG_IPV6_MROUTE
505 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
506 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
507 devconf->mc_forwarding) < 0)
508 goto nla_put_failure;
510 return nlmsg_end(skb, nlh);
513 nlmsg_cancel(skb, nlh);
517 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
518 struct ipv6_devconf *devconf)
523 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
527 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
528 RTM_NEWNETCONF, 0, type);
530 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
531 WARN_ON(err == -EMSGSIZE);
535 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
538 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
541 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
542 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
543 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
546 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
547 struct nlmsghdr *nlh)
549 struct net *net = sock_net(in_skb->sk);
550 struct nlattr *tb[NETCONFA_MAX+1];
551 struct netconfmsg *ncm;
553 struct ipv6_devconf *devconf;
554 struct inet6_dev *in6_dev;
555 struct net_device *dev;
559 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
560 devconf_ipv6_policy);
565 if (!tb[NETCONFA_IFINDEX])
568 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
570 case NETCONFA_IFINDEX_ALL:
571 devconf = net->ipv6.devconf_all;
573 case NETCONFA_IFINDEX_DEFAULT:
574 devconf = net->ipv6.devconf_dflt;
577 dev = __dev_get_by_index(net, ifindex);
580 in6_dev = __in6_dev_get(dev);
583 devconf = &in6_dev->cnf;
588 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
592 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
593 NETLINK_CB(in_skb).portid,
594 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
597 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
598 WARN_ON(err == -EMSGSIZE);
602 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
607 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
608 struct netlink_callback *cb)
610 struct net *net = sock_net(skb->sk);
613 struct net_device *dev;
614 struct inet6_dev *idev;
615 struct hlist_head *head;
618 s_idx = idx = cb->args[1];
620 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
622 head = &net->dev_index_head[h];
624 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
626 hlist_for_each_entry_rcu(dev, head, index_hlist) {
629 idev = __in6_dev_get(dev);
633 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
635 NETLINK_CB(cb->skb).portid,
643 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
649 if (h == NETDEV_HASHENTRIES) {
650 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
651 net->ipv6.devconf_all,
652 NETLINK_CB(cb->skb).portid,
654 RTM_NEWNETCONF, NLM_F_MULTI,
660 if (h == NETDEV_HASHENTRIES + 1) {
661 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
662 net->ipv6.devconf_dflt,
663 NETLINK_CB(cb->skb).portid,
665 RTM_NEWNETCONF, NLM_F_MULTI,
679 static void dev_forward_change(struct inet6_dev *idev)
681 struct net_device *dev;
682 struct inet6_ifaddr *ifa;
687 if (idev->cnf.forwarding)
688 dev_disable_lro(dev);
689 if (dev->flags & IFF_MULTICAST) {
690 if (idev->cnf.forwarding) {
691 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
692 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
693 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
695 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
696 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
697 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
701 list_for_each_entry(ifa, &idev->addr_list, if_list) {
702 if (ifa->flags&IFA_F_TENTATIVE)
704 if (idev->cnf.forwarding)
705 addrconf_join_anycast(ifa);
707 addrconf_leave_anycast(ifa);
709 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
710 dev->ifindex, &idev->cnf);
714 static void addrconf_forward_change(struct net *net, __s32 newf)
716 struct net_device *dev;
717 struct inet6_dev *idev;
719 for_each_netdev(net, dev) {
720 idev = __in6_dev_get(dev);
722 int changed = (!idev->cnf.forwarding) ^ (!newf);
723 idev->cnf.forwarding = newf;
725 dev_forward_change(idev);
730 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
736 return restart_syscall();
738 net = (struct net *)table->extra2;
742 if (p == &net->ipv6.devconf_dflt->forwarding) {
743 if ((!newf) ^ (!old))
744 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
745 NETCONFA_IFINDEX_DEFAULT,
746 net->ipv6.devconf_dflt);
751 if (p == &net->ipv6.devconf_all->forwarding) {
752 net->ipv6.devconf_dflt->forwarding = newf;
753 addrconf_forward_change(net, newf);
754 if ((!newf) ^ (!old))
755 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
756 NETCONFA_IFINDEX_ALL,
757 net->ipv6.devconf_all);
758 } else if ((!newf) ^ (!old))
759 dev_forward_change((struct inet6_dev *)table->extra1);
763 rt6_purge_dflt_routers(net);
768 /* Nobody refers to this ifaddr, destroy it */
769 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
771 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
773 #ifdef NET_REFCNT_DEBUG
774 pr_debug("%s\n", __func__);
777 in6_dev_put(ifp->idev);
779 if (del_timer(&ifp->timer))
780 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
782 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
783 pr_warn("Freeing alive inet6 address %p\n", ifp);
792 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
795 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
798 * Each device address list is sorted in order of scope -
799 * global before linklocal.
801 list_for_each(p, &idev->addr_list) {
802 struct inet6_ifaddr *ifa
803 = list_entry(p, struct inet6_ifaddr, if_list);
804 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
808 list_add_tail(&ifp->if_list, p);
811 static u32 inet6_addr_hash(const struct in6_addr *addr)
813 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
816 /* On success it returns ifp with increased reference count */
818 static struct inet6_ifaddr *
819 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
820 int scope, u32 flags)
822 struct inet6_ifaddr *ifa = NULL;
826 int addr_type = ipv6_addr_type(addr);
828 if (addr_type == IPV6_ADDR_ANY ||
829 addr_type & IPV6_ADDR_MULTICAST ||
830 (!(idev->dev->flags & IFF_LOOPBACK) &&
831 addr_type & IPV6_ADDR_LOOPBACK))
832 return ERR_PTR(-EADDRNOTAVAIL);
836 err = -ENODEV; /*XXX*/
840 if (idev->cnf.disable_ipv6) {
845 spin_lock(&addrconf_hash_lock);
847 /* Ignore adding duplicate addresses on an interface */
848 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
849 ADBG(("ipv6_add_addr: already assigned\n"));
854 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
857 ADBG(("ipv6_add_addr: malloc failed\n"));
862 rt = addrconf_dst_alloc(idev, addr, false);
870 spin_lock_init(&ifa->lock);
871 spin_lock_init(&ifa->state_lock);
872 init_timer(&ifa->timer);
873 INIT_HLIST_NODE(&ifa->addr_lst);
874 ifa->timer.data = (unsigned long) ifa;
876 ifa->prefix_len = pfxlen;
877 ifa->flags = flags | IFA_F_TENTATIVE;
878 ifa->cstamp = ifa->tstamp = jiffies;
879 ifa->tokenized = false;
888 /* Add to big hash table */
889 hash = inet6_addr_hash(addr);
891 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
892 spin_unlock(&addrconf_hash_lock);
894 write_lock(&idev->lock);
895 /* Add to inet6_dev unicast addr list. */
896 ipv6_link_dev_addr(idev, ifa);
898 #ifdef CONFIG_IPV6_PRIVACY
899 if (ifa->flags&IFA_F_TEMPORARY) {
900 list_add(&ifa->tmp_list, &idev->tempaddr_list);
906 write_unlock(&idev->lock);
908 rcu_read_unlock_bh();
910 if (likely(err == 0))
911 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
919 spin_unlock(&addrconf_hash_lock);
923 /* This function wants to get referenced ifp and releases it before return */
925 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
927 struct inet6_ifaddr *ifa, *ifn;
928 struct inet6_dev *idev = ifp->idev;
930 int deleted = 0, onlink = 0;
931 unsigned long expires = jiffies;
933 spin_lock_bh(&ifp->state_lock);
935 ifp->state = INET6_IFADDR_STATE_DEAD;
936 spin_unlock_bh(&ifp->state_lock);
938 if (state == INET6_IFADDR_STATE_DEAD)
941 spin_lock_bh(&addrconf_hash_lock);
942 hlist_del_init_rcu(&ifp->addr_lst);
943 spin_unlock_bh(&addrconf_hash_lock);
945 write_lock_bh(&idev->lock);
946 #ifdef CONFIG_IPV6_PRIVACY
947 if (ifp->flags&IFA_F_TEMPORARY) {
948 list_del(&ifp->tmp_list);
950 in6_ifa_put(ifp->ifpub);
957 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
959 list_del_init(&ifp->if_list);
962 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
966 } else if (ifp->flags & IFA_F_PERMANENT) {
967 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
969 if (ifa->flags & IFA_F_PERMANENT) {
974 unsigned long lifetime;
979 spin_lock(&ifa->lock);
981 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
983 * Note: Because this address is
984 * not permanent, lifetime <
985 * LONG_MAX / HZ here.
987 if (time_before(expires,
988 ifa->tstamp + lifetime * HZ))
989 expires = ifa->tstamp + lifetime * HZ;
990 spin_unlock(&ifa->lock);
995 write_unlock_bh(&idev->lock);
997 addrconf_del_timer(ifp);
999 ipv6_ifa_notify(RTM_DELADDR, ifp);
1001 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1004 * Purge or update corresponding prefix
1006 * 1) we don't purge prefix here if address was not permanent.
1007 * prefix is managed by its own lifetime.
1008 * 2) if there're no addresses, delete prefix.
1009 * 3) if there're still other permanent address(es),
1010 * corresponding prefix is still permanent.
1011 * 4) otherwise, update prefix lifetime to the
1012 * longest valid lifetime among the corresponding
1013 * addresses on the device.
1014 * Note: subsequent RA will update lifetime.
1018 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
1019 struct in6_addr prefix;
1020 struct rt6_info *rt;
1022 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
1024 rt = addrconf_get_prefix_route(&prefix,
1027 0, RTF_GATEWAY | RTF_DEFAULT);
1033 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
1034 rt6_set_expires(rt, expires);
1040 /* clean up prefsrc entries */
1041 rt6_remove_prefsrc(ifp);
1046 #ifdef CONFIG_IPV6_PRIVACY
1047 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1049 struct inet6_dev *idev = ifp->idev;
1050 struct in6_addr addr, *tmpaddr;
1051 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1052 unsigned long regen_advance;
1057 unsigned long now = jiffies;
1059 write_lock(&idev->lock);
1061 spin_lock_bh(&ift->lock);
1062 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1063 spin_unlock_bh(&ift->lock);
1070 if (idev->cnf.use_tempaddr <= 0) {
1071 write_unlock(&idev->lock);
1072 pr_info("%s: use_tempaddr is disabled\n", __func__);
1077 spin_lock_bh(&ifp->lock);
1078 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1079 idev->cnf.use_tempaddr = -1; /*XXX*/
1080 spin_unlock_bh(&ifp->lock);
1081 write_unlock(&idev->lock);
1082 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1089 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1090 __ipv6_try_regen_rndid(idev, tmpaddr);
1091 memcpy(&addr.s6_addr[8], idev->rndid, 8);
1092 age = (now - ifp->tstamp) / HZ;
1093 tmp_valid_lft = min_t(__u32,
1095 idev->cnf.temp_valid_lft + age);
1096 tmp_prefered_lft = min_t(__u32,
1098 idev->cnf.temp_prefered_lft + age -
1099 idev->cnf.max_desync_factor);
1100 tmp_plen = ifp->prefix_len;
1101 max_addresses = idev->cnf.max_addresses;
1102 tmp_tstamp = ifp->tstamp;
1103 spin_unlock_bh(&ifp->lock);
1105 regen_advance = idev->cnf.regen_max_retry *
1106 idev->cnf.dad_transmits *
1107 idev->nd_parms->retrans_time / HZ;
1108 write_unlock(&idev->lock);
1110 /* A temporary address is created only if this calculated Preferred
1111 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1112 * an implementation must not create a temporary address with a zero
1113 * Preferred Lifetime.
1114 * Use age calculation as in addrconf_verify to avoid unnecessary
1115 * temporary addresses being generated.
1117 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1118 if (tmp_prefered_lft <= regen_advance + age) {
1125 addr_flags = IFA_F_TEMPORARY;
1126 /* set in addrconf_prefix_rcv() */
1127 if (ifp->flags & IFA_F_OPTIMISTIC)
1128 addr_flags |= IFA_F_OPTIMISTIC;
1130 ift = ipv6_add_addr(idev, &addr, tmp_plen,
1131 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
1136 pr_info("%s: retry temporary address regeneration\n", __func__);
1138 write_lock(&idev->lock);
1142 spin_lock_bh(&ift->lock);
1144 ift->valid_lft = tmp_valid_lft;
1145 ift->prefered_lft = tmp_prefered_lft;
1147 ift->tstamp = tmp_tstamp;
1148 spin_unlock_bh(&ift->lock);
1150 addrconf_dad_start(ift);
1159 * Choose an appropriate source address (RFC3484)
1162 IPV6_SADDR_RULE_INIT = 0,
1163 IPV6_SADDR_RULE_LOCAL,
1164 IPV6_SADDR_RULE_SCOPE,
1165 IPV6_SADDR_RULE_PREFERRED,
1166 #ifdef CONFIG_IPV6_MIP6
1167 IPV6_SADDR_RULE_HOA,
1169 IPV6_SADDR_RULE_OIF,
1170 IPV6_SADDR_RULE_LABEL,
1171 #ifdef CONFIG_IPV6_PRIVACY
1172 IPV6_SADDR_RULE_PRIVACY,
1174 IPV6_SADDR_RULE_ORCHID,
1175 IPV6_SADDR_RULE_PREFIX,
1179 struct ipv6_saddr_score {
1182 struct inet6_ifaddr *ifa;
1183 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1188 struct ipv6_saddr_dst {
1189 const struct in6_addr *addr;
1196 static inline int ipv6_saddr_preferred(int type)
1198 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1203 static int ipv6_get_saddr_eval(struct net *net,
1204 struct ipv6_saddr_score *score,
1205 struct ipv6_saddr_dst *dst,
1210 if (i <= score->rule) {
1212 case IPV6_SADDR_RULE_SCOPE:
1213 ret = score->scopedist;
1215 case IPV6_SADDR_RULE_PREFIX:
1216 ret = score->matchlen;
1219 ret = !!test_bit(i, score->scorebits);
1225 case IPV6_SADDR_RULE_INIT:
1226 /* Rule 0: remember if hiscore is not ready yet */
1229 case IPV6_SADDR_RULE_LOCAL:
1230 /* Rule 1: Prefer same address */
1231 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1233 case IPV6_SADDR_RULE_SCOPE:
1234 /* Rule 2: Prefer appropriate scope
1239 * ---+--+-+---> scope
1241 * | d is scope of the destination.
1243 * | \ <- smaller scope is better if
1244 * B-15 | \ if scope is enough for destinaion.
1245 * | ret = B - scope (-1 <= scope >= d <= 15).
1247 * |/ <- greater is better
1248 * -C / if scope is not enough for destination.
1249 * /| ret = scope - C (-1 <= d < scope <= 15).
1251 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1252 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1253 * Assume B = 0 and we get C > 29.
1255 ret = __ipv6_addr_src_scope(score->addr_type);
1256 if (ret >= dst->scope)
1259 ret -= 128; /* 30 is enough */
1260 score->scopedist = ret;
1262 case IPV6_SADDR_RULE_PREFERRED:
1263 /* Rule 3: Avoid deprecated and optimistic addresses */
1264 ret = ipv6_saddr_preferred(score->addr_type) ||
1265 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1267 #ifdef CONFIG_IPV6_MIP6
1268 case IPV6_SADDR_RULE_HOA:
1270 /* Rule 4: Prefer home address */
1271 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1272 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1276 case IPV6_SADDR_RULE_OIF:
1277 /* Rule 5: Prefer outgoing interface */
1278 ret = (!dst->ifindex ||
1279 dst->ifindex == score->ifa->idev->dev->ifindex);
1281 case IPV6_SADDR_RULE_LABEL:
1282 /* Rule 6: Prefer matching label */
1283 ret = ipv6_addr_label(net,
1284 &score->ifa->addr, score->addr_type,
1285 score->ifa->idev->dev->ifindex) == dst->label;
1287 #ifdef CONFIG_IPV6_PRIVACY
1288 case IPV6_SADDR_RULE_PRIVACY:
1290 /* Rule 7: Prefer public address
1291 * Note: prefer temporary address if use_tempaddr >= 2
1293 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1294 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1295 score->ifa->idev->cnf.use_tempaddr >= 2;
1296 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1300 case IPV6_SADDR_RULE_ORCHID:
1301 /* Rule 8-: Prefer ORCHID vs ORCHID or
1302 * non-ORCHID vs non-ORCHID
1304 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1305 ipv6_addr_orchid(dst->addr));
1307 case IPV6_SADDR_RULE_PREFIX:
1308 /* Rule 8: Use longest matching prefix */
1309 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1310 if (ret > score->ifa->prefix_len)
1311 ret = score->ifa->prefix_len;
1312 score->matchlen = ret;
1319 __set_bit(i, score->scorebits);
1325 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1326 const struct in6_addr *daddr, unsigned int prefs,
1327 struct in6_addr *saddr)
1329 struct ipv6_saddr_score scores[2],
1330 *score = &scores[0], *hiscore = &scores[1];
1331 struct ipv6_saddr_dst dst;
1332 struct net_device *dev;
1335 dst_type = __ipv6_addr_type(daddr);
1337 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1338 dst.scope = __ipv6_addr_src_scope(dst_type);
1339 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1343 hiscore->ifa = NULL;
1347 for_each_netdev_rcu(net, dev) {
1348 struct inet6_dev *idev;
1350 /* Candidate Source Address (section 4)
1351 * - multicast and link-local destination address,
1352 * the set of candidate source address MUST only
1353 * include addresses assigned to interfaces
1354 * belonging to the same link as the outgoing
1356 * (- For site-local destination addresses, the
1357 * set of candidate source addresses MUST only
1358 * include addresses assigned to interfaces
1359 * belonging to the same site as the outgoing
1362 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1363 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1364 dst.ifindex && dev->ifindex != dst.ifindex)
1367 idev = __in6_dev_get(dev);
1371 read_lock_bh(&idev->lock);
1372 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1376 * - Tentative Address (RFC2462 section 5.4)
1377 * - A tentative address is not considered
1378 * "assigned to an interface" in the traditional
1379 * sense, unless it is also flagged as optimistic.
1380 * - Candidate Source Address (section 4)
1381 * - In any case, anycast addresses, multicast
1382 * addresses, and the unspecified address MUST
1383 * NOT be included in a candidate set.
1385 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1386 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1389 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1391 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1392 score->addr_type & IPV6_ADDR_MULTICAST)) {
1393 LIMIT_NETDEBUG(KERN_DEBUG
1394 "ADDRCONF: unspecified / multicast address "
1395 "assigned as unicast address on %s",
1401 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1403 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1404 int minihiscore, miniscore;
1406 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1407 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1409 if (minihiscore > miniscore) {
1410 if (i == IPV6_SADDR_RULE_SCOPE &&
1411 score->scopedist > 0) {
1414 * each remaining entry
1415 * has too small (not enough)
1416 * scope, because ifa entries
1417 * are sorted by their scope
1423 } else if (minihiscore < miniscore) {
1425 in6_ifa_put(hiscore->ifa);
1427 in6_ifa_hold(score->ifa);
1429 swap(hiscore, score);
1431 /* restore our iterator */
1432 score->ifa = hiscore->ifa;
1439 read_unlock_bh(&idev->lock);
1444 return -EADDRNOTAVAIL;
1446 *saddr = hiscore->ifa->addr;
1447 in6_ifa_put(hiscore->ifa);
1450 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1452 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1453 unsigned char banned_flags)
1455 struct inet6_ifaddr *ifp;
1456 int err = -EADDRNOTAVAIL;
1458 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1459 if (ifp->scope == IFA_LINK &&
1460 !(ifp->flags & banned_flags)) {
1469 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1470 unsigned char banned_flags)
1472 struct inet6_dev *idev;
1473 int err = -EADDRNOTAVAIL;
1476 idev = __in6_dev_get(dev);
1478 read_lock_bh(&idev->lock);
1479 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1480 read_unlock_bh(&idev->lock);
1486 static int ipv6_count_addresses(struct inet6_dev *idev)
1489 struct inet6_ifaddr *ifp;
1491 read_lock_bh(&idev->lock);
1492 list_for_each_entry(ifp, &idev->addr_list, if_list)
1494 read_unlock_bh(&idev->lock);
1498 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1499 const struct net_device *dev, int strict)
1501 struct inet6_ifaddr *ifp;
1502 unsigned int hash = inet6_addr_hash(addr);
1505 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1506 if (!net_eq(dev_net(ifp->idev->dev), net))
1508 if (ipv6_addr_equal(&ifp->addr, addr) &&
1509 !(ifp->flags&IFA_F_TENTATIVE) &&
1510 (dev == NULL || ifp->idev->dev == dev ||
1511 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1512 rcu_read_unlock_bh();
1517 rcu_read_unlock_bh();
1520 EXPORT_SYMBOL(ipv6_chk_addr);
1522 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1523 struct net_device *dev)
1525 unsigned int hash = inet6_addr_hash(addr);
1526 struct inet6_ifaddr *ifp;
1528 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1529 if (!net_eq(dev_net(ifp->idev->dev), net))
1531 if (ipv6_addr_equal(&ifp->addr, addr)) {
1532 if (dev == NULL || ifp->idev->dev == dev)
1539 /* Compares an address/prefix_len with addresses on device @dev.
1540 * If one is found it returns true.
1542 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1543 const unsigned int prefix_len, struct net_device *dev)
1545 struct inet6_dev *idev;
1546 struct inet6_ifaddr *ifa;
1550 idev = __in6_dev_get(dev);
1552 read_lock_bh(&idev->lock);
1553 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1554 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1558 read_unlock_bh(&idev->lock);
1564 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1566 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1568 struct inet6_dev *idev;
1569 struct inet6_ifaddr *ifa;
1574 idev = __in6_dev_get(dev);
1576 read_lock_bh(&idev->lock);
1577 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1578 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1583 read_unlock_bh(&idev->lock);
1588 EXPORT_SYMBOL(ipv6_chk_prefix);
1590 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1591 struct net_device *dev, int strict)
1593 struct inet6_ifaddr *ifp, *result = NULL;
1594 unsigned int hash = inet6_addr_hash(addr);
1597 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1598 if (!net_eq(dev_net(ifp->idev->dev), net))
1600 if (ipv6_addr_equal(&ifp->addr, addr)) {
1601 if (dev == NULL || ifp->idev->dev == dev ||
1602 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1609 rcu_read_unlock_bh();
1614 /* Gets referenced address, destroys ifaddr */
1616 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1618 if (ifp->flags&IFA_F_PERMANENT) {
1619 spin_lock_bh(&ifp->lock);
1620 addrconf_del_timer(ifp);
1621 ifp->flags |= IFA_F_TENTATIVE;
1623 ifp->flags |= IFA_F_DADFAILED;
1624 spin_unlock_bh(&ifp->lock);
1626 ipv6_ifa_notify(0, ifp);
1628 #ifdef CONFIG_IPV6_PRIVACY
1629 } else if (ifp->flags&IFA_F_TEMPORARY) {
1630 struct inet6_ifaddr *ifpub;
1631 spin_lock_bh(&ifp->lock);
1634 in6_ifa_hold(ifpub);
1635 spin_unlock_bh(&ifp->lock);
1636 ipv6_create_tempaddr(ifpub, ifp);
1639 spin_unlock_bh(&ifp->lock);
1647 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1651 spin_lock(&ifp->state_lock);
1652 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1653 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1656 spin_unlock(&ifp->state_lock);
1661 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1663 struct inet6_dev *idev = ifp->idev;
1665 if (addrconf_dad_end(ifp)) {
1670 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1671 ifp->idev->dev->name, &ifp->addr);
1673 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1674 struct in6_addr addr;
1676 addr.s6_addr32[0] = htonl(0xfe800000);
1677 addr.s6_addr32[1] = 0;
1679 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1680 ipv6_addr_equal(&ifp->addr, &addr)) {
1681 /* DAD failed for link-local based on MAC address */
1682 idev->cnf.disable_ipv6 = 1;
1684 pr_info("%s: IPv6 being disabled!\n",
1685 ifp->idev->dev->name);
1689 addrconf_dad_stop(ifp, 1);
1692 /* Join to solicited addr multicast group. */
1694 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1696 struct in6_addr maddr;
1698 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1701 addrconf_addr_solict_mult(addr, &maddr);
1702 ipv6_dev_mc_inc(dev, &maddr);
1705 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1707 struct in6_addr maddr;
1709 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1712 addrconf_addr_solict_mult(addr, &maddr);
1713 __ipv6_dev_mc_dec(idev, &maddr);
1716 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1718 struct in6_addr addr;
1719 if (ifp->prefix_len == 127) /* RFC 6164 */
1721 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1722 if (ipv6_addr_any(&addr))
1724 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1727 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1729 struct in6_addr addr;
1730 if (ifp->prefix_len == 127) /* RFC 6164 */
1732 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1733 if (ipv6_addr_any(&addr))
1735 __ipv6_dev_ac_dec(ifp->idev, &addr);
1738 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1740 if (dev->addr_len != ETH_ALEN)
1742 memcpy(eui, dev->dev_addr, 3);
1743 memcpy(eui + 5, dev->dev_addr + 3, 3);
1746 * The zSeries OSA network cards can be shared among various
1747 * OS instances, but the OSA cards have only one MAC address.
1748 * This leads to duplicate address conflicts in conjunction
1749 * with IPv6 if more than one instance uses the same card.
1751 * The driver for these cards can deliver a unique 16-bit
1752 * identifier for each instance sharing the same card. It is
1753 * placed instead of 0xFFFE in the interface identifier. The
1754 * "u" bit of the interface identifier is not inverted in this
1755 * case. Hence the resulting interface identifier has local
1756 * scope according to RFC2373.
1759 eui[3] = (dev->dev_id >> 8) & 0xFF;
1760 eui[4] = dev->dev_id & 0xFF;
1769 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1771 if (dev->addr_len != IEEE802154_ADDR_LEN)
1773 memcpy(eui, dev->dev_addr, 8);
1778 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1780 union fwnet_hwaddr *ha;
1782 if (dev->addr_len != FWNET_ALEN)
1785 ha = (union fwnet_hwaddr *)dev->dev_addr;
1787 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1792 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1794 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1795 if (dev->addr_len != ARCNET_ALEN)
1798 eui[7] = *(u8 *)dev->dev_addr;
1802 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1804 if (dev->addr_len != INFINIBAND_ALEN)
1806 memcpy(eui, dev->dev_addr + 12, 8);
1811 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1815 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1816 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1817 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1818 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1819 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1820 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1824 memcpy(eui + 4, &addr, 4);
1828 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1830 if (dev->priv_flags & IFF_ISATAP)
1831 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1835 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1837 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1840 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1842 switch (dev->type) {
1845 return addrconf_ifid_eui48(eui, dev);
1847 return addrconf_ifid_arcnet(eui, dev);
1848 case ARPHRD_INFINIBAND:
1849 return addrconf_ifid_infiniband(eui, dev);
1851 return addrconf_ifid_sit(eui, dev);
1853 return addrconf_ifid_gre(eui, dev);
1854 case ARPHRD_IEEE802154:
1855 return addrconf_ifid_eui64(eui, dev);
1856 case ARPHRD_IEEE1394:
1857 return addrconf_ifid_ieee1394(eui, dev);
1862 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1865 struct inet6_ifaddr *ifp;
1867 read_lock_bh(&idev->lock);
1868 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1869 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1870 memcpy(eui, ifp->addr.s6_addr+8, 8);
1875 read_unlock_bh(&idev->lock);
1879 #ifdef CONFIG_IPV6_PRIVACY
1880 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1881 static void __ipv6_regen_rndid(struct inet6_dev *idev)
1884 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1885 idev->rndid[0] &= ~0x02;
1888 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1889 * check if generated address is not inappropriate
1891 * - Reserved subnet anycast (RFC 2526)
1892 * 11111101 11....11 1xxxxxxx
1893 * - ISATAP (RFC4214) 6.1
1894 * 00-00-5E-FE-xx-xx-xx-xx
1896 * - XXX: already assigned to an address on the device
1898 if (idev->rndid[0] == 0xfd &&
1899 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1900 (idev->rndid[7]&0x80))
1902 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1903 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1905 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1910 static void ipv6_regen_rndid(unsigned long data)
1912 struct inet6_dev *idev = (struct inet6_dev *) data;
1913 unsigned long expires;
1916 write_lock_bh(&idev->lock);
1921 __ipv6_regen_rndid(idev);
1924 idev->cnf.temp_prefered_lft * HZ -
1925 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1926 idev->cnf.max_desync_factor * HZ;
1927 if (time_before(expires, jiffies)) {
1928 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
1929 __func__, idev->dev->name);
1933 if (!mod_timer(&idev->regen_timer, expires))
1937 write_unlock_bh(&idev->lock);
1938 rcu_read_unlock_bh();
1942 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
1944 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1945 __ipv6_regen_rndid(idev);
1954 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1955 unsigned long expires, u32 flags)
1957 struct fib6_config cfg = {
1958 .fc_table = RT6_TABLE_PREFIX,
1959 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1960 .fc_ifindex = dev->ifindex,
1961 .fc_expires = expires,
1963 .fc_flags = RTF_UP | flags,
1964 .fc_nlinfo.nl_net = dev_net(dev),
1965 .fc_protocol = RTPROT_KERNEL,
1970 /* Prevent useless cloning on PtP SIT.
1971 This thing is done here expecting that the whole
1972 class of non-broadcast devices need not cloning.
1974 #if IS_ENABLED(CONFIG_IPV6_SIT)
1975 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1976 cfg.fc_flags |= RTF_NONEXTHOP;
1979 ip6_route_add(&cfg);
1983 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
1985 const struct net_device *dev,
1986 u32 flags, u32 noflags)
1988 struct fib6_node *fn;
1989 struct rt6_info *rt = NULL;
1990 struct fib6_table *table;
1992 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
1996 read_lock_bh(&table->tb6_lock);
1997 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2000 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2001 if (rt->dst.dev->ifindex != dev->ifindex)
2003 if ((rt->rt6i_flags & flags) != flags)
2005 if ((rt->rt6i_flags & noflags) != 0)
2011 read_unlock_bh(&table->tb6_lock);
2016 /* Create "default" multicast route to the interface */
2018 static void addrconf_add_mroute(struct net_device *dev)
2020 struct fib6_config cfg = {
2021 .fc_table = RT6_TABLE_LOCAL,
2022 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2023 .fc_ifindex = dev->ifindex,
2026 .fc_nlinfo.nl_net = dev_net(dev),
2029 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2031 ip6_route_add(&cfg);
2034 #if IS_ENABLED(CONFIG_IPV6_SIT)
2035 static void sit_route_add(struct net_device *dev)
2037 struct fib6_config cfg = {
2038 .fc_table = RT6_TABLE_MAIN,
2039 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2040 .fc_ifindex = dev->ifindex,
2042 .fc_flags = RTF_UP | RTF_NONEXTHOP,
2043 .fc_nlinfo.nl_net = dev_net(dev),
2046 /* prefix length - 96 bits "::d.d.d.d" */
2047 ip6_route_add(&cfg);
2051 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2053 struct inet6_dev *idev;
2057 idev = ipv6_find_idev(dev);
2059 return ERR_PTR(-ENOBUFS);
2061 if (idev->cnf.disable_ipv6)
2062 return ERR_PTR(-EACCES);
2064 /* Add default multicast route */
2065 if (!(dev->flags & IFF_LOOPBACK))
2066 addrconf_add_mroute(dev);
2071 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2073 struct prefix_info *pinfo;
2077 struct inet6_dev *in6_dev;
2078 struct net *net = dev_net(dev);
2080 pinfo = (struct prefix_info *) opt;
2082 if (len < sizeof(struct prefix_info)) {
2083 ADBG(("addrconf: prefix option too short\n"));
2088 * Validation checks ([ADDRCONF], page 19)
2091 addr_type = ipv6_addr_type(&pinfo->prefix);
2093 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2096 valid_lft = ntohl(pinfo->valid);
2097 prefered_lft = ntohl(pinfo->prefered);
2099 if (prefered_lft > valid_lft) {
2100 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2104 in6_dev = in6_dev_get(dev);
2106 if (in6_dev == NULL) {
2107 net_dbg_ratelimited("addrconf: device %s not configured\n",
2113 * Two things going on here:
2114 * 1) Add routes for on-link prefixes
2115 * 2) Configure prefixes with the auto flag set
2118 if (pinfo->onlink) {
2119 struct rt6_info *rt;
2120 unsigned long rt_expires;
2122 /* Avoid arithmetic overflow. Really, we could
2123 * save rt_expires in seconds, likely valid_lft,
2124 * but it would require division in fib gc, that it
2128 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2130 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2132 if (addrconf_finite_timeout(rt_expires))
2135 rt = addrconf_get_prefix_route(&pinfo->prefix,
2138 RTF_ADDRCONF | RTF_PREFIX_RT,
2139 RTF_GATEWAY | RTF_DEFAULT);
2142 /* Autoconf prefix route */
2143 if (valid_lft == 0) {
2146 } else if (addrconf_finite_timeout(rt_expires)) {
2148 rt6_set_expires(rt, jiffies + rt_expires);
2150 rt6_clean_expires(rt);
2152 } else if (valid_lft) {
2153 clock_t expires = 0;
2154 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2155 if (addrconf_finite_timeout(rt_expires)) {
2157 flags |= RTF_EXPIRES;
2158 expires = jiffies_to_clock_t(rt_expires);
2160 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2161 dev, expires, flags);
2166 /* Try to figure out our local address for this prefix */
2168 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2169 struct inet6_ifaddr *ifp;
2170 struct in6_addr addr;
2171 int create = 0, update_lft = 0;
2172 bool tokenized = false;
2174 if (pinfo->prefix_len == 64) {
2175 memcpy(&addr, &pinfo->prefix, 8);
2177 if (!ipv6_addr_any(&in6_dev->token)) {
2178 read_lock_bh(&in6_dev->lock);
2179 memcpy(addr.s6_addr + 8,
2180 in6_dev->token.s6_addr + 8, 8);
2181 read_unlock_bh(&in6_dev->lock);
2183 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2184 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2185 in6_dev_put(in6_dev);
2190 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2192 in6_dev_put(in6_dev);
2197 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
2199 if (ifp == NULL && valid_lft) {
2200 int max_addresses = in6_dev->cnf.max_addresses;
2203 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2204 if (in6_dev->cnf.optimistic_dad &&
2205 !net->ipv6.devconf_all->forwarding && sllao)
2206 addr_flags = IFA_F_OPTIMISTIC;
2209 /* Do not allow to create too much of autoconfigured
2210 * addresses; this would be too easy way to crash kernel.
2212 if (!max_addresses ||
2213 ipv6_count_addresses(in6_dev) < max_addresses)
2214 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
2215 addr_type&IPV6_ADDR_SCOPE_MASK,
2218 if (IS_ERR_OR_NULL(ifp)) {
2219 in6_dev_put(in6_dev);
2223 update_lft = create = 1;
2224 ifp->cstamp = jiffies;
2225 ifp->tokenized = tokenized;
2226 addrconf_dad_start(ifp);
2232 #ifdef CONFIG_IPV6_PRIVACY
2233 struct inet6_ifaddr *ift;
2237 /* update lifetime (RFC2462 5.5.3 e) */
2238 spin_lock(&ifp->lock);
2240 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2241 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2244 if (!update_lft && stored_lft) {
2245 if (valid_lft > MIN_VALID_LIFETIME ||
2246 valid_lft > stored_lft)
2248 else if (stored_lft <= MIN_VALID_LIFETIME) {
2249 /* valid_lft <= stored_lft is always true */
2251 * RFC 4862 Section 5.5.3e:
2252 * "Note that the preferred lifetime of
2253 * the corresponding address is always
2254 * reset to the Preferred Lifetime in
2255 * the received Prefix Information
2256 * option, regardless of whether the
2257 * valid lifetime is also reset or
2260 * So if the preferred lifetime in
2261 * this advertisement is different
2262 * than what we have stored, but the
2263 * valid lifetime is invalid, just
2264 * reset prefered_lft.
2266 * We must set the valid lifetime
2267 * to the stored lifetime since we'll
2268 * be updating the timestamp below,
2269 * else we'll set it back to the
2272 if (prefered_lft != ifp->prefered_lft) {
2273 valid_lft = stored_lft;
2277 valid_lft = MIN_VALID_LIFETIME;
2278 if (valid_lft < prefered_lft)
2279 prefered_lft = valid_lft;
2285 ifp->valid_lft = valid_lft;
2286 ifp->prefered_lft = prefered_lft;
2289 ifp->flags &= ~IFA_F_DEPRECATED;
2290 spin_unlock(&ifp->lock);
2292 if (!(flags&IFA_F_TENTATIVE))
2293 ipv6_ifa_notify(0, ifp);
2295 spin_unlock(&ifp->lock);
2297 #ifdef CONFIG_IPV6_PRIVACY
2298 read_lock_bh(&in6_dev->lock);
2299 /* update all temporary addresses in the list */
2300 list_for_each_entry(ift, &in6_dev->tempaddr_list,
2302 int age, max_valid, max_prefered;
2304 if (ifp != ift->ifpub)
2308 * RFC 4941 section 3.3:
2309 * If a received option will extend the lifetime
2310 * of a public address, the lifetimes of
2311 * temporary addresses should be extended,
2312 * subject to the overall constraint that no
2313 * temporary addresses should ever remain
2314 * "valid" or "preferred" for a time longer than
2315 * (TEMP_VALID_LIFETIME) or
2316 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR),
2319 age = (now - ift->cstamp) / HZ;
2320 max_valid = in6_dev->cnf.temp_valid_lft - age;
2324 max_prefered = in6_dev->cnf.temp_prefered_lft -
2325 in6_dev->cnf.max_desync_factor -
2327 if (max_prefered < 0)
2330 if (valid_lft > max_valid)
2331 valid_lft = max_valid;
2333 if (prefered_lft > max_prefered)
2334 prefered_lft = max_prefered;
2336 spin_lock(&ift->lock);
2338 ift->valid_lft = valid_lft;
2339 ift->prefered_lft = prefered_lft;
2341 if (prefered_lft > 0)
2342 ift->flags &= ~IFA_F_DEPRECATED;
2344 spin_unlock(&ift->lock);
2345 if (!(flags&IFA_F_TENTATIVE))
2346 ipv6_ifa_notify(0, ift);
2349 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
2351 * When a new public address is created as
2352 * described in [ADDRCONF], also create a new
2353 * temporary address. Also create a temporary
2354 * address if it's enabled but no temporary
2355 * address currently exists.
2357 read_unlock_bh(&in6_dev->lock);
2358 ipv6_create_tempaddr(ifp, NULL);
2360 read_unlock_bh(&in6_dev->lock);
2367 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2368 in6_dev_put(in6_dev);
2372 * Set destination address.
2373 * Special case for SIT interfaces where we create a new "virtual"
2376 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2378 struct in6_ifreq ireq;
2379 struct net_device *dev;
2385 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2388 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2394 #if IS_ENABLED(CONFIG_IPV6_SIT)
2395 if (dev->type == ARPHRD_SIT) {
2396 const struct net_device_ops *ops = dev->netdev_ops;
2398 struct ip_tunnel_parm p;
2400 err = -EADDRNOTAVAIL;
2401 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2404 memset(&p, 0, sizeof(p));
2405 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2409 p.iph.protocol = IPPROTO_IPV6;
2411 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2413 if (ops->ndo_do_ioctl) {
2414 mm_segment_t oldfs = get_fs();
2417 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2424 dev = __dev_get_by_name(net, p.name);
2427 err = dev_open(dev);
2438 * Manual configuration of address on an interface
2440 static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx,
2441 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2444 struct inet6_ifaddr *ifp;
2445 struct inet6_dev *idev;
2446 struct net_device *dev;
2450 unsigned long timeout;
2457 /* check the lifetime */
2458 if (!valid_lft || prefered_lft > valid_lft)
2461 dev = __dev_get_by_index(net, ifindex);
2465 idev = addrconf_add_dev(dev);
2467 return PTR_ERR(idev);
2469 scope = ipv6_addr_scope(pfx);
2471 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2472 if (addrconf_finite_timeout(timeout)) {
2473 expires = jiffies_to_clock_t(timeout * HZ);
2474 valid_lft = timeout;
2475 flags = RTF_EXPIRES;
2479 ifa_flags |= IFA_F_PERMANENT;
2482 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2483 if (addrconf_finite_timeout(timeout)) {
2485 ifa_flags |= IFA_F_DEPRECATED;
2486 prefered_lft = timeout;
2489 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2492 spin_lock_bh(&ifp->lock);
2493 ifp->valid_lft = valid_lft;
2494 ifp->prefered_lft = prefered_lft;
2495 ifp->tstamp = jiffies;
2496 spin_unlock_bh(&ifp->lock);
2498 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2501 * Note that section 3.1 of RFC 4429 indicates
2502 * that the Optimistic flag should not be set for
2503 * manually configured addresses
2505 addrconf_dad_start(ifp);
2511 return PTR_ERR(ifp);
2514 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
2517 struct inet6_ifaddr *ifp;
2518 struct inet6_dev *idev;
2519 struct net_device *dev;
2524 dev = __dev_get_by_index(net, ifindex);
2528 if ((idev = __in6_dev_get(dev)) == NULL)
2531 read_lock_bh(&idev->lock);
2532 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2533 if (ifp->prefix_len == plen &&
2534 ipv6_addr_equal(pfx, &ifp->addr)) {
2536 read_unlock_bh(&idev->lock);
2540 /* If the last address is deleted administratively,
2541 disable IPv6 on this interface.
2543 if (list_empty(&idev->addr_list))
2544 addrconf_ifdown(idev->dev, 1);
2548 read_unlock_bh(&idev->lock);
2549 return -EADDRNOTAVAIL;
2553 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2555 struct in6_ifreq ireq;
2558 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2561 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2565 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2566 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2567 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2572 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2574 struct in6_ifreq ireq;
2577 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2580 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2584 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2585 ireq.ifr6_prefixlen);
2590 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2591 int plen, int scope)
2593 struct inet6_ifaddr *ifp;
2595 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2597 spin_lock_bh(&ifp->lock);
2598 ifp->flags &= ~IFA_F_TENTATIVE;
2599 spin_unlock_bh(&ifp->lock);
2600 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2605 #if IS_ENABLED(CONFIG_IPV6_SIT)
2606 static void sit_add_v4_addrs(struct inet6_dev *idev)
2608 struct in6_addr addr;
2609 struct net_device *dev;
2610 struct net *net = dev_net(idev->dev);
2615 memset(&addr, 0, sizeof(struct in6_addr));
2616 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2618 if (idev->dev->flags&IFF_POINTOPOINT) {
2619 addr.s6_addr32[0] = htonl(0xfe800000);
2622 scope = IPV6_ADDR_COMPATv4;
2625 if (addr.s6_addr32[3]) {
2626 add_addr(idev, &addr, 128, scope);
2630 for_each_netdev(net, dev) {
2631 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2632 if (in_dev && (dev->flags & IFF_UP)) {
2633 struct in_ifaddr *ifa;
2637 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2640 addr.s6_addr32[3] = ifa->ifa_local;
2642 if (ifa->ifa_scope == RT_SCOPE_LINK)
2644 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2645 if (idev->dev->flags&IFF_POINTOPOINT)
2649 if (idev->dev->flags&IFF_POINTOPOINT)
2654 add_addr(idev, &addr, plen, flag);
2661 static void init_loopback(struct net_device *dev)
2663 struct inet6_dev *idev;
2664 struct net_device *sp_dev;
2665 struct inet6_ifaddr *sp_ifa;
2666 struct rt6_info *sp_rt;
2672 if ((idev = ipv6_find_idev(dev)) == NULL) {
2673 pr_debug("%s: add_dev failed\n", __func__);
2677 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2679 /* Add routes to other interface's IPv6 addresses */
2680 for_each_netdev(dev_net(dev), sp_dev) {
2681 if (!strcmp(sp_dev->name, dev->name))
2684 idev = __in6_dev_get(sp_dev);
2688 read_lock_bh(&idev->lock);
2689 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2691 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2697 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, 0);
2699 /* Failure cases are ignored */
2700 if (!IS_ERR(sp_rt)) {
2705 read_unlock_bh(&idev->lock);
2709 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
2711 struct inet6_ifaddr *ifp;
2712 u32 addr_flags = IFA_F_PERMANENT;
2714 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2715 if (idev->cnf.optimistic_dad &&
2716 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2717 addr_flags |= IFA_F_OPTIMISTIC;
2721 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2723 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2724 addrconf_dad_start(ifp);
2729 static void addrconf_dev_config(struct net_device *dev)
2731 struct in6_addr addr;
2732 struct inet6_dev *idev;
2736 if ((dev->type != ARPHRD_ETHER) &&
2737 (dev->type != ARPHRD_FDDI) &&
2738 (dev->type != ARPHRD_ARCNET) &&
2739 (dev->type != ARPHRD_INFINIBAND) &&
2740 (dev->type != ARPHRD_IEEE802154) &&
2741 (dev->type != ARPHRD_IEEE1394)) {
2742 /* Alas, we support only Ethernet autoconfiguration. */
2746 idev = addrconf_add_dev(dev);
2750 memset(&addr, 0, sizeof(struct in6_addr));
2751 addr.s6_addr32[0] = htonl(0xFE800000);
2753 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2754 addrconf_add_linklocal(idev, &addr);
2757 #if IS_ENABLED(CONFIG_IPV6_SIT)
2758 static void addrconf_sit_config(struct net_device *dev)
2760 struct inet6_dev *idev;
2765 * Configure the tunnel with one of our IPv4
2766 * addresses... we should configure all of
2767 * our v4 addrs in the tunnel
2770 if ((idev = ipv6_find_idev(dev)) == NULL) {
2771 pr_debug("%s: add_dev failed\n", __func__);
2775 if (dev->priv_flags & IFF_ISATAP) {
2776 struct in6_addr addr;
2778 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2779 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2780 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2781 addrconf_add_linklocal(idev, &addr);
2785 sit_add_v4_addrs(idev);
2787 if (dev->flags&IFF_POINTOPOINT)
2788 addrconf_add_mroute(dev);
2794 #if IS_ENABLED(CONFIG_NET_IPGRE)
2795 static void addrconf_gre_config(struct net_device *dev)
2797 struct inet6_dev *idev;
2798 struct in6_addr addr;
2800 pr_info("%s(%s)\n", __func__, dev->name);
2804 if ((idev = ipv6_find_idev(dev)) == NULL) {
2805 pr_debug("%s: add_dev failed\n", __func__);
2809 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2810 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2812 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2813 addrconf_add_linklocal(idev, &addr);
2818 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2820 struct in6_addr lladdr;
2822 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2823 addrconf_add_linklocal(idev, &lladdr);
2829 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2831 struct net_device *link_dev;
2832 struct net *net = dev_net(idev->dev);
2834 /* first try to inherit the link-local address from the link device */
2835 if (idev->dev->iflink &&
2836 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2837 if (!ipv6_inherit_linklocal(idev, link_dev))
2840 /* then try to inherit it from any device */
2841 for_each_netdev(net, link_dev) {
2842 if (!ipv6_inherit_linklocal(idev, link_dev))
2845 pr_debug("init ip6-ip6: add_linklocal failed\n");
2849 * Autoconfigure tunnel with a link-local address so routing protocols,
2850 * DHCPv6, MLD etc. can be run over the virtual link
2853 static void addrconf_ip6_tnl_config(struct net_device *dev)
2855 struct inet6_dev *idev;
2859 idev = addrconf_add_dev(dev);
2861 pr_debug("init ip6-ip6: add_dev failed\n");
2864 ip6_tnl_add_linklocal(idev);
2867 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2870 struct net_device *dev = (struct net_device *) data;
2871 struct inet6_dev *idev = __in6_dev_get(dev);
2872 int run_pending = 0;
2876 case NETDEV_REGISTER:
2877 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2878 idev = ipv6_add_dev(dev);
2880 return notifier_from_errno(-ENOMEM);
2886 if (dev->flags & IFF_SLAVE)
2889 if (event == NETDEV_UP) {
2890 if (!addrconf_qdisc_ok(dev)) {
2891 /* device is not ready yet. */
2892 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
2897 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2898 idev = ipv6_add_dev(dev);
2901 idev->if_flags |= IF_READY;
2905 if (!addrconf_qdisc_ok(dev)) {
2906 /* device is still not ready. */
2911 if (idev->if_flags & IF_READY)
2912 /* device is already configured. */
2914 idev->if_flags |= IF_READY;
2917 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
2923 switch (dev->type) {
2924 #if IS_ENABLED(CONFIG_IPV6_SIT)
2926 addrconf_sit_config(dev);
2929 #if IS_ENABLED(CONFIG_NET_IPGRE)
2931 addrconf_gre_config(dev);
2934 case ARPHRD_TUNNEL6:
2935 addrconf_ip6_tnl_config(dev);
2937 case ARPHRD_LOOPBACK:
2942 addrconf_dev_config(dev);
2948 addrconf_dad_run(idev);
2951 * If the MTU changed during the interface down,
2952 * when the interface up, the changed MTU must be
2953 * reflected in the idev as well as routers.
2955 if (idev->cnf.mtu6 != dev->mtu &&
2956 dev->mtu >= IPV6_MIN_MTU) {
2957 rt6_mtu_change(dev, dev->mtu);
2958 idev->cnf.mtu6 = dev->mtu;
2960 idev->tstamp = jiffies;
2961 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2964 * If the changed mtu during down is lower than
2965 * IPV6_MIN_MTU stop IPv6 on this interface.
2967 if (dev->mtu < IPV6_MIN_MTU)
2968 addrconf_ifdown(dev, 1);
2972 case NETDEV_CHANGEMTU:
2973 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2974 rt6_mtu_change(dev, dev->mtu);
2975 idev->cnf.mtu6 = dev->mtu;
2979 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2980 idev = ipv6_add_dev(dev);
2986 * MTU falled under IPV6_MIN_MTU.
2987 * Stop IPv6 on this interface.
2991 case NETDEV_UNREGISTER:
2993 * Remove all addresses from this interface.
2995 addrconf_ifdown(dev, event != NETDEV_DOWN);
2998 case NETDEV_CHANGENAME:
3000 snmp6_unregister_dev(idev);
3001 addrconf_sysctl_unregister(idev);
3002 addrconf_sysctl_register(idev);
3003 err = snmp6_register_dev(idev);
3005 return notifier_from_errno(err);
3009 case NETDEV_PRE_TYPE_CHANGE:
3010 case NETDEV_POST_TYPE_CHANGE:
3011 addrconf_type_change(dev, event);
3019 * addrconf module should be notified of a device going up
3021 static struct notifier_block ipv6_dev_notf = {
3022 .notifier_call = addrconf_notify,
3025 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3027 struct inet6_dev *idev;
3030 idev = __in6_dev_get(dev);
3032 if (event == NETDEV_POST_TYPE_CHANGE)
3033 ipv6_mc_remap(idev);
3034 else if (event == NETDEV_PRE_TYPE_CHANGE)
3035 ipv6_mc_unmap(idev);
3038 static int addrconf_ifdown(struct net_device *dev, int how)
3040 struct net *net = dev_net(dev);
3041 struct inet6_dev *idev;
3042 struct inet6_ifaddr *ifa;
3047 rt6_ifdown(net, dev);
3048 neigh_ifdown(&nd_tbl, dev);
3050 idev = __in6_dev_get(dev);
3055 * Step 1: remove reference to ipv6 device from parent device.
3061 /* protected by rtnl_lock */
3062 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3064 /* Step 1.5: remove snmp6 entry */
3065 snmp6_unregister_dev(idev);
3069 /* Step 2: clear hash table */
3070 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3071 struct hlist_head *h = &inet6_addr_lst[i];
3073 spin_lock_bh(&addrconf_hash_lock);
3075 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3076 if (ifa->idev == idev) {
3077 hlist_del_init_rcu(&ifa->addr_lst);
3078 addrconf_del_timer(ifa);
3082 spin_unlock_bh(&addrconf_hash_lock);
3085 write_lock_bh(&idev->lock);
3087 /* Step 2: clear flags for stateless addrconf */
3089 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3091 #ifdef CONFIG_IPV6_PRIVACY
3092 if (how && del_timer(&idev->regen_timer))
3095 /* Step 3: clear tempaddr list */
3096 while (!list_empty(&idev->tempaddr_list)) {
3097 ifa = list_first_entry(&idev->tempaddr_list,
3098 struct inet6_ifaddr, tmp_list);
3099 list_del(&ifa->tmp_list);
3100 write_unlock_bh(&idev->lock);
3101 spin_lock_bh(&ifa->lock);
3104 in6_ifa_put(ifa->ifpub);
3107 spin_unlock_bh(&ifa->lock);
3109 write_lock_bh(&idev->lock);
3113 while (!list_empty(&idev->addr_list)) {
3114 ifa = list_first_entry(&idev->addr_list,
3115 struct inet6_ifaddr, if_list);
3116 addrconf_del_timer(ifa);
3118 list_del(&ifa->if_list);
3120 write_unlock_bh(&idev->lock);
3122 spin_lock_bh(&ifa->state_lock);
3124 ifa->state = INET6_IFADDR_STATE_DEAD;
3125 spin_unlock_bh(&ifa->state_lock);
3127 if (state != INET6_IFADDR_STATE_DEAD) {
3128 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3129 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3133 write_lock_bh(&idev->lock);
3136 write_unlock_bh(&idev->lock);
3138 /* Step 5: Discard multicast list */
3140 ipv6_mc_destroy_dev(idev);
3144 idev->tstamp = jiffies;
3146 /* Last: Shot the device (if unregistered) */
3148 addrconf_sysctl_unregister(idev);
3149 neigh_parms_release(&nd_tbl, idev->nd_parms);
3150 neigh_ifdown(&nd_tbl, dev);
3156 static void addrconf_rs_timer(unsigned long data)
3158 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
3159 struct inet6_dev *idev = ifp->idev;
3161 read_lock(&idev->lock);
3162 if (idev->dead || !(idev->if_flags & IF_READY))
3165 if (!ipv6_accept_ra(idev))
3168 /* Announcement received after solicitation was sent */
3169 if (idev->if_flags & IF_RA_RCVD)
3172 spin_lock(&ifp->lock);
3173 if (ifp->probes++ < idev->cnf.rtr_solicits) {
3174 /* The wait after the last probe can be shorter */
3175 addrconf_mod_timer(ifp, AC_RS,
3176 (ifp->probes == idev->cnf.rtr_solicits) ?
3177 idev->cnf.rtr_solicit_delay :
3178 idev->cnf.rtr_solicit_interval);
3179 spin_unlock(&ifp->lock);
3181 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
3183 spin_unlock(&ifp->lock);
3185 * Note: we do not support deprecated "all on-link"
3186 * assumption any longer.
3188 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3192 read_unlock(&idev->lock);
3197 * Duplicate Address Detection
3199 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3201 unsigned long rand_num;
3202 struct inet6_dev *idev = ifp->idev;
3204 if (ifp->flags & IFA_F_OPTIMISTIC)
3207 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
3209 ifp->probes = idev->cnf.dad_transmits;
3210 addrconf_mod_timer(ifp, AC_DAD, rand_num);
3213 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3215 struct inet6_dev *idev = ifp->idev;
3216 struct net_device *dev = idev->dev;
3218 addrconf_join_solict(dev, &ifp->addr);
3220 net_srandom(ifp->addr.s6_addr32[3]);
3222 read_lock_bh(&idev->lock);
3223 spin_lock(&ifp->lock);
3224 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3227 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3228 idev->cnf.accept_dad < 1 ||
3229 !(ifp->flags&IFA_F_TENTATIVE) ||
3230 ifp->flags & IFA_F_NODAD) {
3231 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3232 spin_unlock(&ifp->lock);
3233 read_unlock_bh(&idev->lock);
3235 addrconf_dad_completed(ifp);
3239 if (!(idev->if_flags & IF_READY)) {
3240 spin_unlock(&ifp->lock);
3241 read_unlock_bh(&idev->lock);
3243 * If the device is not ready:
3244 * - keep it tentative if it is a permanent address.
3245 * - otherwise, kill it.
3248 addrconf_dad_stop(ifp, 0);
3253 * Optimistic nodes can start receiving
3256 if (ifp->flags & IFA_F_OPTIMISTIC)
3257 ip6_ins_rt(ifp->rt);
3259 addrconf_dad_kick(ifp);
3261 spin_unlock(&ifp->lock);
3262 read_unlock_bh(&idev->lock);
3265 static void addrconf_dad_timer(unsigned long data)
3267 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
3268 struct inet6_dev *idev = ifp->idev;
3269 struct in6_addr mcaddr;
3271 if (!ifp->probes && addrconf_dad_end(ifp))
3274 read_lock(&idev->lock);
3275 if (idev->dead || !(idev->if_flags & IF_READY)) {
3276 read_unlock(&idev->lock);
3280 spin_lock(&ifp->lock);
3281 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3282 spin_unlock(&ifp->lock);
3283 read_unlock(&idev->lock);
3287 if (ifp->probes == 0) {
3289 * DAD was successful
3292 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3293 spin_unlock(&ifp->lock);
3294 read_unlock(&idev->lock);
3296 addrconf_dad_completed(ifp);
3302 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
3303 spin_unlock(&ifp->lock);
3304 read_unlock(&idev->lock);
3306 /* send a neighbour solicitation for our addr */
3307 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3308 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
3313 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3315 struct net_device *dev = ifp->idev->dev;
3318 * Configure the address for reception. Now it is valid.
3321 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3323 /* If added prefix is link local and we are prepared to process
3324 router advertisements, start sending router solicitations.
3327 if (ipv6_accept_ra(ifp->idev) &&
3328 ifp->idev->cnf.rtr_solicits > 0 &&
3329 (dev->flags&IFF_LOOPBACK) == 0 &&
3330 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
3332 * If a host as already performed a random delay
3333 * [...] as part of DAD [...] there is no need
3334 * to delay again before sending the first RS
3336 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
3338 spin_lock_bh(&ifp->lock);
3340 ifp->idev->if_flags |= IF_RS_SENT;
3341 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
3342 spin_unlock_bh(&ifp->lock);
3346 static void addrconf_dad_run(struct inet6_dev *idev)
3348 struct inet6_ifaddr *ifp;
3350 read_lock_bh(&idev->lock);
3351 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3352 spin_lock(&ifp->lock);
3353 if (ifp->flags & IFA_F_TENTATIVE &&
3354 ifp->state == INET6_IFADDR_STATE_DAD)
3355 addrconf_dad_kick(ifp);
3356 spin_unlock(&ifp->lock);
3358 read_unlock_bh(&idev->lock);
3361 #ifdef CONFIG_PROC_FS
3362 struct if6_iter_state {
3363 struct seq_net_private p;
3368 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3370 struct inet6_ifaddr *ifa = NULL;
3371 struct if6_iter_state *state = seq->private;
3372 struct net *net = seq_file_net(seq);
3375 /* initial bucket if pos is 0 */
3381 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3382 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
3384 if (!net_eq(dev_net(ifa->idev->dev), net))
3386 /* sync with offset */
3387 if (p < state->offset) {
3395 /* prepare for next bucket */
3402 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3403 struct inet6_ifaddr *ifa)
3405 struct if6_iter_state *state = seq->private;
3406 struct net *net = seq_file_net(seq);
3408 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
3409 if (!net_eq(dev_net(ifa->idev->dev), net))
3415 while (++state->bucket < IN6_ADDR_HSIZE) {
3417 hlist_for_each_entry_rcu_bh(ifa,
3418 &inet6_addr_lst[state->bucket], addr_lst) {
3419 if (!net_eq(dev_net(ifa->idev->dev), net))
3429 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3433 return if6_get_first(seq, *pos);
3436 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3438 struct inet6_ifaddr *ifa;
3440 ifa = if6_get_next(seq, v);
3445 static void if6_seq_stop(struct seq_file *seq, void *v)
3448 rcu_read_unlock_bh();
3451 static int if6_seq_show(struct seq_file *seq, void *v)
3453 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3454 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3456 ifp->idev->dev->ifindex,
3460 ifp->idev->dev->name);
3464 static const struct seq_operations if6_seq_ops = {
3465 .start = if6_seq_start,
3466 .next = if6_seq_next,
3467 .show = if6_seq_show,
3468 .stop = if6_seq_stop,
3471 static int if6_seq_open(struct inode *inode, struct file *file)
3473 return seq_open_net(inode, file, &if6_seq_ops,
3474 sizeof(struct if6_iter_state));
3477 static const struct file_operations if6_fops = {
3478 .owner = THIS_MODULE,
3479 .open = if6_seq_open,
3481 .llseek = seq_lseek,
3482 .release = seq_release_net,
3485 static int __net_init if6_proc_net_init(struct net *net)
3487 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
3492 static void __net_exit if6_proc_net_exit(struct net *net)
3494 remove_proc_entry("if_inet6", net->proc_net);
3497 static struct pernet_operations if6_proc_net_ops = {
3498 .init = if6_proc_net_init,
3499 .exit = if6_proc_net_exit,
3502 int __init if6_proc_init(void)
3504 return register_pernet_subsys(&if6_proc_net_ops);
3507 void if6_proc_exit(void)
3509 unregister_pernet_subsys(&if6_proc_net_ops);
3511 #endif /* CONFIG_PROC_FS */
3513 #if IS_ENABLED(CONFIG_IPV6_MIP6)
3514 /* Check if address is a home address configured on any interface. */
3515 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3518 struct inet6_ifaddr *ifp = NULL;
3519 unsigned int hash = inet6_addr_hash(addr);
3522 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
3523 if (!net_eq(dev_net(ifp->idev->dev), net))
3525 if (ipv6_addr_equal(&ifp->addr, addr) &&
3526 (ifp->flags & IFA_F_HOMEADDRESS)) {
3531 rcu_read_unlock_bh();
3537 * Periodic address status verification
3540 static void addrconf_verify(unsigned long foo)
3542 unsigned long now, next, next_sec, next_sched;
3543 struct inet6_ifaddr *ifp;
3547 spin_lock(&addrconf_verify_lock);
3549 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3551 del_timer(&addr_chk_timer);
3553 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3555 hlist_for_each_entry_rcu_bh(ifp,
3556 &inet6_addr_lst[i], addr_lst) {
3559 if (ifp->flags & IFA_F_PERMANENT)
3562 spin_lock(&ifp->lock);
3563 /* We try to batch several events at once. */
3564 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3566 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3567 age >= ifp->valid_lft) {
3568 spin_unlock(&ifp->lock);
3572 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3573 spin_unlock(&ifp->lock);
3575 } else if (age >= ifp->prefered_lft) {
3576 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3579 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3581 ifp->flags |= IFA_F_DEPRECATED;
3584 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3585 next = ifp->tstamp + ifp->valid_lft * HZ;
3587 spin_unlock(&ifp->lock);
3592 ipv6_ifa_notify(0, ifp);
3596 #ifdef CONFIG_IPV6_PRIVACY
3597 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3598 !(ifp->flags&IFA_F_TENTATIVE)) {
3599 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3600 ifp->idev->cnf.dad_transmits *
3601 ifp->idev->nd_parms->retrans_time / HZ;
3603 if (age >= ifp->prefered_lft - regen_advance) {
3604 struct inet6_ifaddr *ifpub = ifp->ifpub;
3605 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3606 next = ifp->tstamp + ifp->prefered_lft * HZ;
3607 if (!ifp->regen_count && ifpub) {
3610 in6_ifa_hold(ifpub);
3611 spin_unlock(&ifp->lock);
3613 spin_lock(&ifpub->lock);
3614 ifpub->regen_count = 0;
3615 spin_unlock(&ifpub->lock);
3616 ipv6_create_tempaddr(ifpub, ifp);
3621 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3622 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3623 spin_unlock(&ifp->lock);
3626 /* ifp->prefered_lft <= ifp->valid_lft */
3627 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3628 next = ifp->tstamp + ifp->prefered_lft * HZ;
3629 spin_unlock(&ifp->lock);
3634 next_sec = round_jiffies_up(next);
3637 /* If rounded timeout is accurate enough, accept it. */
3638 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3639 next_sched = next_sec;
3641 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3642 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3643 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3645 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3646 now, next, next_sec, next_sched));
3648 addr_chk_timer.expires = next_sched;
3649 add_timer(&addr_chk_timer);
3650 spin_unlock(&addrconf_verify_lock);
3651 rcu_read_unlock_bh();
3654 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3656 struct in6_addr *pfx = NULL;
3659 pfx = nla_data(addr);
3662 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3665 pfx = nla_data(local);
3671 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3672 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3673 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3674 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3678 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
3680 struct net *net = sock_net(skb->sk);
3681 struct ifaddrmsg *ifm;
3682 struct nlattr *tb[IFA_MAX+1];
3683 struct in6_addr *pfx;
3686 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3690 ifm = nlmsg_data(nlh);
3691 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3695 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3698 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3699 u32 prefered_lft, u32 valid_lft)
3703 unsigned long timeout;
3705 if (!valid_lft || (prefered_lft > valid_lft))
3708 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3709 if (addrconf_finite_timeout(timeout)) {
3710 expires = jiffies_to_clock_t(timeout * HZ);
3711 valid_lft = timeout;
3712 flags = RTF_EXPIRES;
3716 ifa_flags |= IFA_F_PERMANENT;
3719 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3720 if (addrconf_finite_timeout(timeout)) {
3722 ifa_flags |= IFA_F_DEPRECATED;
3723 prefered_lft = timeout;
3726 spin_lock_bh(&ifp->lock);
3727 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3728 ifp->tstamp = jiffies;
3729 ifp->valid_lft = valid_lft;
3730 ifp->prefered_lft = prefered_lft;
3732 spin_unlock_bh(&ifp->lock);
3733 if (!(ifp->flags&IFA_F_TENTATIVE))
3734 ipv6_ifa_notify(0, ifp);
3736 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3744 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
3746 struct net *net = sock_net(skb->sk);
3747 struct ifaddrmsg *ifm;
3748 struct nlattr *tb[IFA_MAX+1];
3749 struct in6_addr *pfx;
3750 struct inet6_ifaddr *ifa;
3751 struct net_device *dev;
3752 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3756 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3760 ifm = nlmsg_data(nlh);
3761 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3765 if (tb[IFA_CACHEINFO]) {
3766 struct ifa_cacheinfo *ci;
3768 ci = nla_data(tb[IFA_CACHEINFO]);
3769 valid_lft = ci->ifa_valid;
3770 preferred_lft = ci->ifa_prefered;
3772 preferred_lft = INFINITY_LIFE_TIME;
3773 valid_lft = INFINITY_LIFE_TIME;
3776 dev = __dev_get_by_index(net, ifm->ifa_index);
3780 /* We ignore other flags so far. */
3781 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3783 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3786 * It would be best to check for !NLM_F_CREATE here but
3787 * userspace alreay relies on not having to provide this.
3789 return inet6_addr_add(net, ifm->ifa_index, pfx,
3790 ifm->ifa_prefixlen, ifa_flags,
3791 preferred_lft, valid_lft);
3794 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3795 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3798 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3805 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3806 u8 scope, int ifindex)
3808 struct ifaddrmsg *ifm;
3810 ifm = nlmsg_data(nlh);
3811 ifm->ifa_family = AF_INET6;
3812 ifm->ifa_prefixlen = prefixlen;
3813 ifm->ifa_flags = flags;
3814 ifm->ifa_scope = scope;
3815 ifm->ifa_index = ifindex;
3818 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3819 unsigned long tstamp, u32 preferred, u32 valid)
3821 struct ifa_cacheinfo ci;
3823 ci.cstamp = cstamp_delta(cstamp);
3824 ci.tstamp = cstamp_delta(tstamp);
3825 ci.ifa_prefered = preferred;
3826 ci.ifa_valid = valid;
3828 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3831 static inline int rt_scope(int ifa_scope)
3833 if (ifa_scope & IFA_HOST)
3834 return RT_SCOPE_HOST;
3835 else if (ifa_scope & IFA_LINK)
3836 return RT_SCOPE_LINK;
3837 else if (ifa_scope & IFA_SITE)
3838 return RT_SCOPE_SITE;
3840 return RT_SCOPE_UNIVERSE;
3843 static inline int inet6_ifaddr_msgsize(void)
3845 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3846 + nla_total_size(16) /* IFA_ADDRESS */
3847 + nla_total_size(sizeof(struct ifa_cacheinfo));
3850 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3851 u32 portid, u32 seq, int event, unsigned int flags)
3853 struct nlmsghdr *nlh;
3854 u32 preferred, valid;
3856 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3860 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3861 ifa->idev->dev->ifindex);
3863 if (!(ifa->flags&IFA_F_PERMANENT)) {
3864 preferred = ifa->prefered_lft;
3865 valid = ifa->valid_lft;
3866 if (preferred != INFINITY_LIFE_TIME) {
3867 long tval = (jiffies - ifa->tstamp)/HZ;
3868 if (preferred > tval)
3872 if (valid != INFINITY_LIFE_TIME) {
3880 preferred = INFINITY_LIFE_TIME;
3881 valid = INFINITY_LIFE_TIME;
3884 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3885 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3886 nlmsg_cancel(skb, nlh);
3890 return nlmsg_end(skb, nlh);
3893 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3894 u32 portid, u32 seq, int event, u16 flags)
3896 struct nlmsghdr *nlh;
3897 u8 scope = RT_SCOPE_UNIVERSE;
3898 int ifindex = ifmca->idev->dev->ifindex;
3900 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3901 scope = RT_SCOPE_SITE;
3903 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3907 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3908 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3909 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3910 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3911 nlmsg_cancel(skb, nlh);
3915 return nlmsg_end(skb, nlh);
3918 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3919 u32 portid, u32 seq, int event, unsigned int flags)
3921 struct nlmsghdr *nlh;
3922 u8 scope = RT_SCOPE_UNIVERSE;
3923 int ifindex = ifaca->aca_idev->dev->ifindex;
3925 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3926 scope = RT_SCOPE_SITE;
3928 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3932 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3933 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3934 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3935 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3936 nlmsg_cancel(skb, nlh);
3940 return nlmsg_end(skb, nlh);
3949 /* called with rcu_read_lock() */
3950 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3951 struct netlink_callback *cb, enum addr_type_t type,
3952 int s_ip_idx, int *p_ip_idx)
3954 struct ifmcaddr6 *ifmca;
3955 struct ifacaddr6 *ifaca;
3957 int ip_idx = *p_ip_idx;
3959 read_lock_bh(&idev->lock);
3961 case UNICAST_ADDR: {
3962 struct inet6_ifaddr *ifa;
3964 /* unicast address incl. temp addr */
3965 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3966 if (++ip_idx < s_ip_idx)
3968 err = inet6_fill_ifaddr(skb, ifa,
3969 NETLINK_CB(cb->skb).portid,
3975 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3979 case MULTICAST_ADDR:
3980 /* multicast address */
3981 for (ifmca = idev->mc_list; ifmca;
3982 ifmca = ifmca->next, ip_idx++) {
3983 if (ip_idx < s_ip_idx)
3985 err = inet6_fill_ifmcaddr(skb, ifmca,
3986 NETLINK_CB(cb->skb).portid,
3995 /* anycast address */
3996 for (ifaca = idev->ac_list; ifaca;
3997 ifaca = ifaca->aca_next, ip_idx++) {
3998 if (ip_idx < s_ip_idx)
4000 err = inet6_fill_ifacaddr(skb, ifaca,
4001 NETLINK_CB(cb->skb).portid,
4012 read_unlock_bh(&idev->lock);
4017 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4018 enum addr_type_t type)
4020 struct net *net = sock_net(skb->sk);
4023 int s_idx, s_ip_idx;
4024 struct net_device *dev;
4025 struct inet6_dev *idev;
4026 struct hlist_head *head;
4029 s_idx = idx = cb->args[1];
4030 s_ip_idx = ip_idx = cb->args[2];
4033 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4034 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4036 head = &net->dev_index_head[h];
4037 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4040 if (h > s_h || idx > s_idx)
4043 idev = __in6_dev_get(dev);
4047 if (in6_dump_addrs(idev, skb, cb, type,
4048 s_ip_idx, &ip_idx) <= 0)
4058 cb->args[2] = ip_idx;
4063 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4065 enum addr_type_t type = UNICAST_ADDR;
4067 return inet6_dump_addr(skb, cb, type);
4070 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4072 enum addr_type_t type = MULTICAST_ADDR;
4074 return inet6_dump_addr(skb, cb, type);
4078 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4080 enum addr_type_t type = ANYCAST_ADDR;
4082 return inet6_dump_addr(skb, cb, type);
4085 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
4087 struct net *net = sock_net(in_skb->sk);
4088 struct ifaddrmsg *ifm;
4089 struct nlattr *tb[IFA_MAX+1];
4090 struct in6_addr *addr = NULL;
4091 struct net_device *dev = NULL;
4092 struct inet6_ifaddr *ifa;
4093 struct sk_buff *skb;
4096 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4100 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
4106 ifm = nlmsg_data(nlh);
4108 dev = __dev_get_by_index(net, ifm->ifa_index);
4110 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4112 err = -EADDRNOTAVAIL;
4116 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4122 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4123 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4125 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4126 WARN_ON(err == -EMSGSIZE);
4130 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4137 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4139 struct sk_buff *skb;
4140 struct net *net = dev_net(ifa->idev->dev);
4143 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4147 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4149 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4150 WARN_ON(err == -EMSGSIZE);
4154 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4158 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4161 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4162 __s32 *array, int bytes)
4164 BUG_ON(bytes < (DEVCONF_MAX * 4));
4166 memset(array, 0, bytes);
4167 array[DEVCONF_FORWARDING] = cnf->forwarding;
4168 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4169 array[DEVCONF_MTU6] = cnf->mtu6;
4170 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4171 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4172 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4173 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4174 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4175 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4176 jiffies_to_msecs(cnf->rtr_solicit_interval);
4177 array[DEVCONF_RTR_SOLICIT_DELAY] =
4178 jiffies_to_msecs(cnf->rtr_solicit_delay);
4179 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4180 #ifdef CONFIG_IPV6_PRIVACY
4181 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4182 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4183 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4184 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4185 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4187 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4188 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4189 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4190 #ifdef CONFIG_IPV6_ROUTER_PREF
4191 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4192 array[DEVCONF_RTR_PROBE_INTERVAL] =
4193 jiffies_to_msecs(cnf->rtr_probe_interval);
4194 #ifdef CONFIG_IPV6_ROUTE_INFO
4195 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4198 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4199 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4200 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4201 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4203 #ifdef CONFIG_IPV6_MROUTE
4204 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4206 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4207 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4208 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4209 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4212 static inline size_t inet6_ifla6_size(void)
4214 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4215 + nla_total_size(sizeof(struct ifla_cacheinfo))
4216 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4217 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4218 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4219 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
4222 static inline size_t inet6_if_nlmsg_size(void)
4224 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4225 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4226 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4227 + nla_total_size(4) /* IFLA_MTU */
4228 + nla_total_size(4) /* IFLA_LINK */
4229 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4232 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4233 int items, int bytes)
4236 int pad = bytes - sizeof(u64) * items;
4239 /* Use put_unaligned() because stats may not be aligned for u64. */
4240 put_unaligned(items, &stats[0]);
4241 for (i = 1; i < items; i++)
4242 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4244 memset(&stats[items], 0, pad);
4247 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
4248 int items, int bytes, size_t syncpoff)
4251 int pad = bytes - sizeof(u64) * items;
4254 /* Use put_unaligned() because stats may not be aligned for u64. */
4255 put_unaligned(items, &stats[0]);
4256 for (i = 1; i < items; i++)
4257 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4259 memset(&stats[items], 0, pad);
4262 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4266 case IFLA_INET6_STATS:
4267 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
4268 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
4270 case IFLA_INET6_ICMP6STATS:
4271 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
4276 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4279 struct ifla_cacheinfo ci;
4281 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4282 goto nla_put_failure;
4283 ci.max_reasm_len = IPV6_MAXPLEN;
4284 ci.tstamp = cstamp_delta(idev->tstamp);
4285 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4286 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
4287 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4288 goto nla_put_failure;
4289 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4291 goto nla_put_failure;
4292 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4294 /* XXX - MC not implemented */
4296 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4298 goto nla_put_failure;
4299 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4301 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4303 goto nla_put_failure;
4304 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4306 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4308 goto nla_put_failure;
4309 read_lock_bh(&idev->lock);
4310 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4311 read_unlock_bh(&idev->lock);
4319 static size_t inet6_get_link_af_size(const struct net_device *dev)
4321 if (!__in6_dev_get(dev))
4324 return inet6_ifla6_size();
4327 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4329 struct inet6_dev *idev = __in6_dev_get(dev);
4334 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4340 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4342 struct inet6_ifaddr *ifp;
4343 struct net_device *dev = idev->dev;
4344 bool update_rs = false;
4345 struct in6_addr ll_addr;
4349 if (ipv6_addr_any(token))
4351 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4353 if (!ipv6_accept_ra(idev))
4355 if (idev->cnf.rtr_solicits <= 0)
4358 write_lock_bh(&idev->lock);
4360 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4361 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4363 write_unlock_bh(&idev->lock);
4365 if (!idev->dead && (idev->if_flags & IF_READY) &&
4366 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4367 IFA_F_OPTIMISTIC)) {
4369 /* If we're not ready, then normal ifup will take care
4370 * of this. Otherwise, we need to request our rs here.
4372 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4376 write_lock_bh(&idev->lock);
4379 idev->if_flags |= IF_RS_SENT;
4381 /* Well, that's kinda nasty ... */
4382 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4383 spin_lock(&ifp->lock);
4384 if (ifp->tokenized) {
4386 ifp->prefered_lft = 0;
4388 spin_unlock(&ifp->lock);
4391 write_unlock_bh(&idev->lock);
4395 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4398 struct inet6_dev *idev = __in6_dev_get(dev);
4399 struct nlattr *tb[IFLA_INET6_MAX + 1];
4402 return -EAFNOSUPPORT;
4404 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4407 if (tb[IFLA_INET6_TOKEN])
4408 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
4413 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4414 u32 portid, u32 seq, int event, unsigned int flags)
4416 struct net_device *dev = idev->dev;
4417 struct ifinfomsg *hdr;
4418 struct nlmsghdr *nlh;
4421 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
4425 hdr = nlmsg_data(nlh);
4426 hdr->ifi_family = AF_INET6;
4428 hdr->ifi_type = dev->type;
4429 hdr->ifi_index = dev->ifindex;
4430 hdr->ifi_flags = dev_get_flags(dev);
4431 hdr->ifi_change = 0;
4433 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4435 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4436 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4437 (dev->ifindex != dev->iflink &&
4438 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4439 goto nla_put_failure;
4440 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4441 if (protoinfo == NULL)
4442 goto nla_put_failure;
4444 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4445 goto nla_put_failure;
4447 nla_nest_end(skb, protoinfo);
4448 return nlmsg_end(skb, nlh);
4451 nlmsg_cancel(skb, nlh);
4455 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4457 struct net *net = sock_net(skb->sk);
4460 struct net_device *dev;
4461 struct inet6_dev *idev;
4462 struct hlist_head *head;
4465 s_idx = cb->args[1];
4468 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4470 head = &net->dev_index_head[h];
4471 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4474 idev = __in6_dev_get(dev);
4477 if (inet6_fill_ifinfo(skb, idev,
4478 NETLINK_CB(cb->skb).portid,
4480 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4494 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4496 struct sk_buff *skb;
4497 struct net *net = dev_net(idev->dev);
4500 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4504 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4506 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4507 WARN_ON(err == -EMSGSIZE);
4511 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4515 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4518 static inline size_t inet6_prefix_nlmsg_size(void)
4520 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4521 + nla_total_size(sizeof(struct in6_addr))
4522 + nla_total_size(sizeof(struct prefix_cacheinfo));
4525 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4526 struct prefix_info *pinfo, u32 portid, u32 seq,
4527 int event, unsigned int flags)
4529 struct prefixmsg *pmsg;
4530 struct nlmsghdr *nlh;
4531 struct prefix_cacheinfo ci;
4533 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
4537 pmsg = nlmsg_data(nlh);
4538 pmsg->prefix_family = AF_INET6;
4539 pmsg->prefix_pad1 = 0;
4540 pmsg->prefix_pad2 = 0;
4541 pmsg->prefix_ifindex = idev->dev->ifindex;
4542 pmsg->prefix_len = pinfo->prefix_len;
4543 pmsg->prefix_type = pinfo->type;
4544 pmsg->prefix_pad3 = 0;
4545 pmsg->prefix_flags = 0;
4547 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4548 if (pinfo->autoconf)
4549 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4551 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4552 goto nla_put_failure;
4553 ci.preferred_time = ntohl(pinfo->prefered);
4554 ci.valid_time = ntohl(pinfo->valid);
4555 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4556 goto nla_put_failure;
4557 return nlmsg_end(skb, nlh);
4560 nlmsg_cancel(skb, nlh);
4564 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4565 struct prefix_info *pinfo)
4567 struct sk_buff *skb;
4568 struct net *net = dev_net(idev->dev);
4571 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4575 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4577 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4578 WARN_ON(err == -EMSGSIZE);
4582 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4586 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4589 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4591 struct net *net = dev_net(ifp->idev->dev);
4593 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4598 * If the address was optimistic
4599 * we inserted the route at the start of
4600 * our DAD process, so we don't need
4603 if (!(ifp->rt->rt6i_node))
4604 ip6_ins_rt(ifp->rt);
4605 if (ifp->idev->cnf.forwarding)
4606 addrconf_join_anycast(ifp);
4609 if (ifp->idev->cnf.forwarding)
4610 addrconf_leave_anycast(ifp);
4611 addrconf_leave_solict(ifp->idev, &ifp->addr);
4612 dst_hold(&ifp->rt->dst);
4614 if (ip6_del_rt(ifp->rt))
4615 dst_free(&ifp->rt->dst);
4618 atomic_inc(&net->ipv6.dev_addr_genid);
4621 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4624 if (likely(ifp->idev->dead == 0))
4625 __ipv6_ifa_notify(event, ifp);
4626 rcu_read_unlock_bh();
4629 #ifdef CONFIG_SYSCTL
4632 int addrconf_sysctl_forward(ctl_table *ctl, int write,
4633 void __user *buffer, size_t *lenp, loff_t *ppos)
4635 int *valp = ctl->data;
4642 * ctl->data points to idev->cnf.forwarding, we should
4643 * not modify it until we get the rtnl lock.
4648 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4651 ret = addrconf_fixup_forwarding(ctl, valp, val);
4657 static void dev_disable_change(struct inet6_dev *idev)
4659 if (!idev || !idev->dev)
4662 if (idev->cnf.disable_ipv6)
4663 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4665 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4668 static void addrconf_disable_change(struct net *net, __s32 newf)
4670 struct net_device *dev;
4671 struct inet6_dev *idev;
4674 for_each_netdev_rcu(net, dev) {
4675 idev = __in6_dev_get(dev);
4677 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4678 idev->cnf.disable_ipv6 = newf;
4680 dev_disable_change(idev);
4686 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
4691 if (!rtnl_trylock())
4692 return restart_syscall();
4694 net = (struct net *)table->extra2;
4698 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4703 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4704 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4705 addrconf_disable_change(net, newf);
4706 } else if ((!newf) ^ (!old))
4707 dev_disable_change((struct inet6_dev *)table->extra1);
4714 int addrconf_sysctl_disable(ctl_table *ctl, int write,
4715 void __user *buffer, size_t *lenp, loff_t *ppos)
4717 int *valp = ctl->data;
4724 * ctl->data points to idev->cnf.disable_ipv6, we should
4725 * not modify it until we get the rtnl lock.
4730 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4733 ret = addrconf_disable_ipv6(ctl, valp, val);
4739 static struct addrconf_sysctl_table
4741 struct ctl_table_header *sysctl_header;
4742 ctl_table addrconf_vars[DEVCONF_MAX+1];
4743 } addrconf_sysctl __read_mostly = {
4744 .sysctl_header = NULL,
4747 .procname = "forwarding",
4748 .data = &ipv6_devconf.forwarding,
4749 .maxlen = sizeof(int),
4751 .proc_handler = addrconf_sysctl_forward,
4754 .procname = "hop_limit",
4755 .data = &ipv6_devconf.hop_limit,
4756 .maxlen = sizeof(int),
4758 .proc_handler = proc_dointvec,
4762 .data = &ipv6_devconf.mtu6,
4763 .maxlen = sizeof(int),
4765 .proc_handler = proc_dointvec,
4768 .procname = "accept_ra",
4769 .data = &ipv6_devconf.accept_ra,
4770 .maxlen = sizeof(int),
4772 .proc_handler = proc_dointvec,
4775 .procname = "accept_redirects",
4776 .data = &ipv6_devconf.accept_redirects,
4777 .maxlen = sizeof(int),
4779 .proc_handler = proc_dointvec,
4782 .procname = "autoconf",
4783 .data = &ipv6_devconf.autoconf,
4784 .maxlen = sizeof(int),
4786 .proc_handler = proc_dointvec,
4789 .procname = "dad_transmits",
4790 .data = &ipv6_devconf.dad_transmits,
4791 .maxlen = sizeof(int),
4793 .proc_handler = proc_dointvec,
4796 .procname = "router_solicitations",
4797 .data = &ipv6_devconf.rtr_solicits,
4798 .maxlen = sizeof(int),
4800 .proc_handler = proc_dointvec,
4803 .procname = "router_solicitation_interval",
4804 .data = &ipv6_devconf.rtr_solicit_interval,
4805 .maxlen = sizeof(int),
4807 .proc_handler = proc_dointvec_jiffies,
4810 .procname = "router_solicitation_delay",
4811 .data = &ipv6_devconf.rtr_solicit_delay,
4812 .maxlen = sizeof(int),
4814 .proc_handler = proc_dointvec_jiffies,
4817 .procname = "force_mld_version",
4818 .data = &ipv6_devconf.force_mld_version,
4819 .maxlen = sizeof(int),
4821 .proc_handler = proc_dointvec,
4823 #ifdef CONFIG_IPV6_PRIVACY
4825 .procname = "use_tempaddr",
4826 .data = &ipv6_devconf.use_tempaddr,
4827 .maxlen = sizeof(int),
4829 .proc_handler = proc_dointvec,
4832 .procname = "temp_valid_lft",
4833 .data = &ipv6_devconf.temp_valid_lft,
4834 .maxlen = sizeof(int),
4836 .proc_handler = proc_dointvec,
4839 .procname = "temp_prefered_lft",
4840 .data = &ipv6_devconf.temp_prefered_lft,
4841 .maxlen = sizeof(int),
4843 .proc_handler = proc_dointvec,
4846 .procname = "regen_max_retry",
4847 .data = &ipv6_devconf.regen_max_retry,
4848 .maxlen = sizeof(int),
4850 .proc_handler = proc_dointvec,
4853 .procname = "max_desync_factor",
4854 .data = &ipv6_devconf.max_desync_factor,
4855 .maxlen = sizeof(int),
4857 .proc_handler = proc_dointvec,
4861 .procname = "max_addresses",
4862 .data = &ipv6_devconf.max_addresses,
4863 .maxlen = sizeof(int),
4865 .proc_handler = proc_dointvec,
4868 .procname = "accept_ra_defrtr",
4869 .data = &ipv6_devconf.accept_ra_defrtr,
4870 .maxlen = sizeof(int),
4872 .proc_handler = proc_dointvec,
4875 .procname = "accept_ra_pinfo",
4876 .data = &ipv6_devconf.accept_ra_pinfo,
4877 .maxlen = sizeof(int),
4879 .proc_handler = proc_dointvec,
4881 #ifdef CONFIG_IPV6_ROUTER_PREF
4883 .procname = "accept_ra_rtr_pref",
4884 .data = &ipv6_devconf.accept_ra_rtr_pref,
4885 .maxlen = sizeof(int),
4887 .proc_handler = proc_dointvec,
4890 .procname = "router_probe_interval",
4891 .data = &ipv6_devconf.rtr_probe_interval,
4892 .maxlen = sizeof(int),
4894 .proc_handler = proc_dointvec_jiffies,
4896 #ifdef CONFIG_IPV6_ROUTE_INFO
4898 .procname = "accept_ra_rt_info_max_plen",
4899 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4900 .maxlen = sizeof(int),
4902 .proc_handler = proc_dointvec,
4907 .procname = "proxy_ndp",
4908 .data = &ipv6_devconf.proxy_ndp,
4909 .maxlen = sizeof(int),
4911 .proc_handler = proc_dointvec,
4914 .procname = "accept_source_route",
4915 .data = &ipv6_devconf.accept_source_route,
4916 .maxlen = sizeof(int),
4918 .proc_handler = proc_dointvec,
4920 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4922 .procname = "optimistic_dad",
4923 .data = &ipv6_devconf.optimistic_dad,
4924 .maxlen = sizeof(int),
4926 .proc_handler = proc_dointvec,
4930 #ifdef CONFIG_IPV6_MROUTE
4932 .procname = "mc_forwarding",
4933 .data = &ipv6_devconf.mc_forwarding,
4934 .maxlen = sizeof(int),
4936 .proc_handler = proc_dointvec,
4940 .procname = "disable_ipv6",
4941 .data = &ipv6_devconf.disable_ipv6,
4942 .maxlen = sizeof(int),
4944 .proc_handler = addrconf_sysctl_disable,
4947 .procname = "accept_dad",
4948 .data = &ipv6_devconf.accept_dad,
4949 .maxlen = sizeof(int),
4951 .proc_handler = proc_dointvec,
4954 .procname = "force_tllao",
4955 .data = &ipv6_devconf.force_tllao,
4956 .maxlen = sizeof(int),
4958 .proc_handler = proc_dointvec
4961 .procname = "ndisc_notify",
4962 .data = &ipv6_devconf.ndisc_notify,
4963 .maxlen = sizeof(int),
4965 .proc_handler = proc_dointvec
4973 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4974 struct inet6_dev *idev, struct ipv6_devconf *p)
4977 struct addrconf_sysctl_table *t;
4978 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
4980 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4984 for (i = 0; t->addrconf_vars[i].data; i++) {
4985 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
4986 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4987 t->addrconf_vars[i].extra2 = net;
4990 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
4992 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
4993 if (t->sysctl_header == NULL)
5005 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5007 struct addrconf_sysctl_table *t;
5009 if (p->sysctl == NULL)
5014 unregister_net_sysctl_table(t->sysctl_header);
5018 static void addrconf_sysctl_register(struct inet6_dev *idev)
5020 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
5021 &ndisc_ifinfo_sysctl_change);
5022 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
5026 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
5028 __addrconf_sysctl_unregister(&idev->cnf);
5029 neigh_sysctl_unregister(idev->nd_parms);
5035 static int __net_init addrconf_init_net(struct net *net)
5038 struct ipv6_devconf *all, *dflt;
5040 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
5044 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
5046 goto err_alloc_dflt;
5048 /* these will be inherited by all namespaces */
5049 dflt->autoconf = ipv6_defaults.autoconf;
5050 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
5052 net->ipv6.devconf_all = all;
5053 net->ipv6.devconf_dflt = dflt;
5055 #ifdef CONFIG_SYSCTL
5056 err = __addrconf_sysctl_register(net, "all", NULL, all);
5060 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
5066 #ifdef CONFIG_SYSCTL
5068 __addrconf_sysctl_unregister(all);
5078 static void __net_exit addrconf_exit_net(struct net *net)
5080 #ifdef CONFIG_SYSCTL
5081 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5082 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5084 if (!net_eq(net, &init_net)) {
5085 kfree(net->ipv6.devconf_dflt);
5086 kfree(net->ipv6.devconf_all);
5090 static struct pernet_operations addrconf_ops = {
5091 .init = addrconf_init_net,
5092 .exit = addrconf_exit_net,
5095 static struct rtnl_af_ops inet6_ops = {
5097 .fill_link_af = inet6_fill_link_af,
5098 .get_link_af_size = inet6_get_link_af_size,
5099 .set_link_af = inet6_set_link_af,
5103 * Init / cleanup code
5106 int __init addrconf_init(void)
5110 err = ipv6_addr_label_init();
5112 pr_crit("%s: cannot initialize default policy table: %d\n",
5117 err = register_pernet_subsys(&addrconf_ops);
5121 /* The addrconf netdev notifier requires that loopback_dev
5122 * has it's ipv6 private information allocated and setup
5123 * before it can bring up and give link-local addresses
5124 * to other devices which are up.
5126 * Unfortunately, loopback_dev is not necessarily the first
5127 * entry in the global dev_base list of net devices. In fact,
5128 * it is likely to be the very last entry on that list.
5129 * So this causes the notifier registry below to try and
5130 * give link-local addresses to all devices besides loopback_dev
5131 * first, then loopback_dev, which cases all the non-loopback_dev
5132 * devices to fail to get a link-local address.
5134 * So, as a temporary fix, allocate the ipv6 structure for
5135 * loopback_dev first by hand.
5136 * Longer term, all of the dependencies ipv6 has upon the loopback
5137 * device and it being up should be removed.
5140 if (!ipv6_add_dev(init_net.loopback_dev))
5146 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5147 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5149 register_netdevice_notifier(&ipv6_dev_notf);
5153 err = rtnl_af_register(&inet6_ops);
5157 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5162 /* Only the first call to __rtnl_register can fail */
5163 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5164 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5165 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5166 inet6_dump_ifaddr, NULL);
5167 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5168 inet6_dump_ifmcaddr, NULL);
5169 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5170 inet6_dump_ifacaddr, NULL);
5171 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
5172 inet6_netconf_dump_devconf, NULL);
5174 ipv6_addr_label_rtnl_register();
5178 rtnl_af_unregister(&inet6_ops);
5180 unregister_netdevice_notifier(&ipv6_dev_notf);
5182 unregister_pernet_subsys(&addrconf_ops);
5184 ipv6_addr_label_cleanup();
5189 void addrconf_cleanup(void)
5191 struct net_device *dev;
5194 unregister_netdevice_notifier(&ipv6_dev_notf);
5195 unregister_pernet_subsys(&addrconf_ops);
5196 ipv6_addr_label_cleanup();
5200 __rtnl_af_unregister(&inet6_ops);
5202 /* clean dev list */
5203 for_each_netdev(&init_net, dev) {
5204 if (__in6_dev_get(dev) == NULL)
5206 addrconf_ifdown(dev, 1);
5208 addrconf_ifdown(init_net.loopback_dev, 2);
5213 spin_lock_bh(&addrconf_hash_lock);
5214 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5215 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5216 spin_unlock_bh(&addrconf_hash_lock);
5218 del_timer(&addr_chk_timer);