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,
201 .accept_ra_rt_table = 0,
203 .accept_source_route = 0, /* we do not accept RH0 by default. */
208 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
210 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
211 .mtu6 = IPV6_MIN_MTU,
213 .accept_redirects = 1,
216 .rtr_solicits = MAX_RTR_SOLICITATIONS,
217 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
218 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
219 #ifdef CONFIG_IPV6_PRIVACY
221 .temp_valid_lft = TEMP_VALID_LIFETIME,
222 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
223 .regen_max_retry = REGEN_MAX_RETRY,
224 .max_desync_factor = MAX_DESYNC_FACTOR,
226 .max_addresses = IPV6_MAX_ADDRESSES,
227 .accept_ra_defrtr = 1,
228 .accept_ra_pinfo = 1,
229 #ifdef CONFIG_IPV6_ROUTER_PREF
230 .accept_ra_rtr_pref = 1,
231 .rtr_probe_interval = 60 * HZ,
232 #ifdef CONFIG_IPV6_ROUTE_INFO
233 .accept_ra_rt_info_max_plen = 0,
236 .accept_ra_rt_table = 0,
238 .accept_source_route = 0, /* we do not accept RH0 by default. */
243 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
244 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
245 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
246 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
247 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
248 const struct in6_addr in6addr_interfacelocal_allnodes = IN6ADDR_INTERFACELOCAL_ALLNODES_INIT;
249 const struct in6_addr in6addr_interfacelocal_allrouters = IN6ADDR_INTERFACELOCAL_ALLROUTERS_INIT;
250 const struct in6_addr in6addr_sitelocal_allrouters = IN6ADDR_SITELOCAL_ALLROUTERS_INIT;
252 /* Check if a valid qdisc is available */
253 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
255 return !qdisc_tx_is_noop(dev);
258 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
260 if (del_timer(&ifp->timer))
264 enum addrconf_timer_t {
270 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
271 enum addrconf_timer_t what,
274 if (!del_timer(&ifp->timer))
279 ifp->timer.function = addrconf_dad_timer;
282 ifp->timer.function = addrconf_rs_timer;
287 ifp->timer.expires = jiffies + when;
288 add_timer(&ifp->timer);
291 static int snmp6_alloc_dev(struct inet6_dev *idev)
293 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
294 sizeof(struct ipstats_mib),
295 __alignof__(struct ipstats_mib)) < 0)
297 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
299 if (!idev->stats.icmpv6dev)
301 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
303 if (!idev->stats.icmpv6msgdev)
309 kfree(idev->stats.icmpv6dev);
311 snmp_mib_free((void __percpu **)idev->stats.ipv6);
316 static void snmp6_free_dev(struct inet6_dev *idev)
318 kfree(idev->stats.icmpv6msgdev);
319 kfree(idev->stats.icmpv6dev);
320 snmp_mib_free((void __percpu **)idev->stats.ipv6);
323 /* Nobody refers to this device, we may destroy it. */
325 void in6_dev_finish_destroy(struct inet6_dev *idev)
327 struct net_device *dev = idev->dev;
329 WARN_ON(!list_empty(&idev->addr_list));
330 WARN_ON(idev->mc_list != NULL);
332 #ifdef NET_REFCNT_DEBUG
333 pr_debug("%s: %s\n", __func__, dev ? dev->name : "NIL");
337 pr_warn("Freeing alive inet6 device %p\n", idev);
340 snmp6_free_dev(idev);
341 kfree_rcu(idev, rcu);
343 EXPORT_SYMBOL(in6_dev_finish_destroy);
345 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
347 struct inet6_dev *ndev;
351 if (dev->mtu < IPV6_MIN_MTU)
354 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
359 rwlock_init(&ndev->lock);
361 INIT_LIST_HEAD(&ndev->addr_list);
363 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
364 ndev->cnf.mtu6 = dev->mtu;
365 ndev->cnf.sysctl = NULL;
366 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
367 if (ndev->nd_parms == NULL) {
371 if (ndev->cnf.forwarding)
372 dev_disable_lro(dev);
373 /* We refer to the device */
376 if (snmp6_alloc_dev(ndev) < 0) {
378 "%s: cannot allocate memory for statistics; dev=%s.\n",
379 __func__, dev->name));
380 neigh_parms_release(&nd_tbl, ndev->nd_parms);
386 if (snmp6_register_dev(ndev) < 0) {
388 "%s: cannot create /proc/net/dev_snmp6/%s\n",
389 __func__, dev->name));
390 neigh_parms_release(&nd_tbl, ndev->nd_parms);
392 in6_dev_finish_destroy(ndev);
396 /* One reference from device. We must do this before
397 * we invoke __ipv6_regen_rndid().
401 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
402 ndev->cnf.accept_dad = -1;
404 #if IS_ENABLED(CONFIG_IPV6_SIT)
405 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
406 pr_info("%s: Disabled Multicast RS\n", dev->name);
407 ndev->cnf.rtr_solicits = 0;
411 #ifdef CONFIG_IPV6_PRIVACY
412 INIT_LIST_HEAD(&ndev->tempaddr_list);
413 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
414 if ((dev->flags&IFF_LOOPBACK) ||
415 dev->type == ARPHRD_TUNNEL ||
416 dev->type == ARPHRD_TUNNEL6 ||
417 dev->type == ARPHRD_SIT ||
418 dev->type == ARPHRD_NONE) {
419 ndev->cnf.use_tempaddr = -1;
422 ipv6_regen_rndid((unsigned long) ndev);
425 ndev->token = in6addr_any;
427 if (netif_running(dev) && addrconf_qdisc_ok(dev))
428 ndev->if_flags |= IF_READY;
430 ipv6_mc_init_dev(ndev);
431 ndev->tstamp = jiffies;
432 addrconf_sysctl_register(ndev);
433 /* protected by rtnl_lock */
434 rcu_assign_pointer(dev->ip6_ptr, ndev);
436 /* Join interface-local all-node multicast group */
437 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
439 /* Join all-node multicast group */
440 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
442 /* Join all-router multicast group if forwarding is set */
443 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
444 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
449 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
451 struct inet6_dev *idev;
455 idev = __in6_dev_get(dev);
457 idev = ipv6_add_dev(dev);
462 if (dev->flags&IFF_UP)
467 static int inet6_netconf_msgsize_devconf(int type)
469 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
470 + nla_total_size(4); /* NETCONFA_IFINDEX */
472 /* type -1 is used for ALL */
473 if (type == -1 || type == NETCONFA_FORWARDING)
474 size += nla_total_size(4);
475 #ifdef CONFIG_IPV6_MROUTE
476 if (type == -1 || type == NETCONFA_MC_FORWARDING)
477 size += nla_total_size(4);
483 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
484 struct ipv6_devconf *devconf, u32 portid,
485 u32 seq, int event, unsigned int flags,
488 struct nlmsghdr *nlh;
489 struct netconfmsg *ncm;
491 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
496 ncm = nlmsg_data(nlh);
497 ncm->ncm_family = AF_INET6;
499 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
500 goto nla_put_failure;
502 /* type -1 is used for ALL */
503 if ((type == -1 || type == NETCONFA_FORWARDING) &&
504 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
505 goto nla_put_failure;
506 #ifdef CONFIG_IPV6_MROUTE
507 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
508 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
509 devconf->mc_forwarding) < 0)
510 goto nla_put_failure;
512 return nlmsg_end(skb, nlh);
515 nlmsg_cancel(skb, nlh);
519 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
520 struct ipv6_devconf *devconf)
525 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
529 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
530 RTM_NEWNETCONF, 0, type);
532 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
533 WARN_ON(err == -EMSGSIZE);
537 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
540 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
543 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
544 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
545 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
548 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
549 struct nlmsghdr *nlh)
551 struct net *net = sock_net(in_skb->sk);
552 struct nlattr *tb[NETCONFA_MAX+1];
553 struct netconfmsg *ncm;
555 struct ipv6_devconf *devconf;
556 struct inet6_dev *in6_dev;
557 struct net_device *dev;
561 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
562 devconf_ipv6_policy);
567 if (!tb[NETCONFA_IFINDEX])
570 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
572 case NETCONFA_IFINDEX_ALL:
573 devconf = net->ipv6.devconf_all;
575 case NETCONFA_IFINDEX_DEFAULT:
576 devconf = net->ipv6.devconf_dflt;
579 dev = __dev_get_by_index(net, ifindex);
582 in6_dev = __in6_dev_get(dev);
585 devconf = &in6_dev->cnf;
590 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
594 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
595 NETLINK_CB(in_skb).portid,
596 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
599 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
600 WARN_ON(err == -EMSGSIZE);
604 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
609 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
610 struct netlink_callback *cb)
612 struct net *net = sock_net(skb->sk);
615 struct net_device *dev;
616 struct inet6_dev *idev;
617 struct hlist_head *head;
620 s_idx = idx = cb->args[1];
622 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
624 head = &net->dev_index_head[h];
626 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
628 hlist_for_each_entry_rcu(dev, head, index_hlist) {
631 idev = __in6_dev_get(dev);
635 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
637 NETLINK_CB(cb->skb).portid,
645 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
651 if (h == NETDEV_HASHENTRIES) {
652 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
653 net->ipv6.devconf_all,
654 NETLINK_CB(cb->skb).portid,
656 RTM_NEWNETCONF, NLM_F_MULTI,
662 if (h == NETDEV_HASHENTRIES + 1) {
663 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
664 net->ipv6.devconf_dflt,
665 NETLINK_CB(cb->skb).portid,
667 RTM_NEWNETCONF, NLM_F_MULTI,
681 static void dev_forward_change(struct inet6_dev *idev)
683 struct net_device *dev;
684 struct inet6_ifaddr *ifa;
689 if (idev->cnf.forwarding)
690 dev_disable_lro(dev);
691 if (dev->flags & IFF_MULTICAST) {
692 if (idev->cnf.forwarding) {
693 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
694 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
695 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
697 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
698 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
699 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
703 list_for_each_entry(ifa, &idev->addr_list, if_list) {
704 if (ifa->flags&IFA_F_TENTATIVE)
706 if (idev->cnf.forwarding)
707 addrconf_join_anycast(ifa);
709 addrconf_leave_anycast(ifa);
711 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
712 dev->ifindex, &idev->cnf);
716 static void addrconf_forward_change(struct net *net, __s32 newf)
718 struct net_device *dev;
719 struct inet6_dev *idev;
721 for_each_netdev(net, dev) {
722 idev = __in6_dev_get(dev);
724 int changed = (!idev->cnf.forwarding) ^ (!newf);
725 idev->cnf.forwarding = newf;
727 dev_forward_change(idev);
732 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
738 return restart_syscall();
740 net = (struct net *)table->extra2;
744 if (p == &net->ipv6.devconf_dflt->forwarding) {
745 if ((!newf) ^ (!old))
746 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
747 NETCONFA_IFINDEX_DEFAULT,
748 net->ipv6.devconf_dflt);
753 if (p == &net->ipv6.devconf_all->forwarding) {
754 net->ipv6.devconf_dflt->forwarding = newf;
755 addrconf_forward_change(net, newf);
756 if ((!newf) ^ (!old))
757 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
758 NETCONFA_IFINDEX_ALL,
759 net->ipv6.devconf_all);
760 } else if ((!newf) ^ (!old))
761 dev_forward_change((struct inet6_dev *)table->extra1);
765 rt6_purge_dflt_routers(net);
770 /* Nobody refers to this ifaddr, destroy it */
771 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
773 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
775 #ifdef NET_REFCNT_DEBUG
776 pr_debug("%s\n", __func__);
779 in6_dev_put(ifp->idev);
781 if (del_timer(&ifp->timer))
782 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
784 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
785 pr_warn("Freeing alive inet6 address %p\n", ifp);
794 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
797 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
800 * Each device address list is sorted in order of scope -
801 * global before linklocal.
803 list_for_each(p, &idev->addr_list) {
804 struct inet6_ifaddr *ifa
805 = list_entry(p, struct inet6_ifaddr, if_list);
806 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
810 list_add_tail(&ifp->if_list, p);
813 static u32 inet6_addr_hash(const struct in6_addr *addr)
815 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
818 /* On success it returns ifp with increased reference count */
820 static struct inet6_ifaddr *
821 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
822 int scope, u32 flags)
824 struct inet6_ifaddr *ifa = NULL;
828 int addr_type = ipv6_addr_type(addr);
830 if (addr_type == IPV6_ADDR_ANY ||
831 addr_type & IPV6_ADDR_MULTICAST ||
832 (!(idev->dev->flags & IFF_LOOPBACK) &&
833 addr_type & IPV6_ADDR_LOOPBACK))
834 return ERR_PTR(-EADDRNOTAVAIL);
838 err = -ENODEV; /*XXX*/
842 if (idev->cnf.disable_ipv6) {
847 spin_lock(&addrconf_hash_lock);
849 /* Ignore adding duplicate addresses on an interface */
850 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
851 ADBG(("ipv6_add_addr: already assigned\n"));
856 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
859 ADBG(("ipv6_add_addr: malloc failed\n"));
864 rt = addrconf_dst_alloc(idev, addr, false);
872 spin_lock_init(&ifa->lock);
873 spin_lock_init(&ifa->state_lock);
874 init_timer(&ifa->timer);
875 INIT_HLIST_NODE(&ifa->addr_lst);
876 ifa->timer.data = (unsigned long) ifa;
878 ifa->prefix_len = pfxlen;
879 ifa->flags = flags | IFA_F_TENTATIVE;
880 ifa->cstamp = ifa->tstamp = jiffies;
881 ifa->tokenized = false;
890 /* Add to big hash table */
891 hash = inet6_addr_hash(addr);
893 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
894 spin_unlock(&addrconf_hash_lock);
896 write_lock(&idev->lock);
897 /* Add to inet6_dev unicast addr list. */
898 ipv6_link_dev_addr(idev, ifa);
900 #ifdef CONFIG_IPV6_PRIVACY
901 if (ifa->flags&IFA_F_TEMPORARY) {
902 list_add(&ifa->tmp_list, &idev->tempaddr_list);
908 write_unlock(&idev->lock);
910 rcu_read_unlock_bh();
912 if (likely(err == 0))
913 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
921 spin_unlock(&addrconf_hash_lock);
925 /* This function wants to get referenced ifp and releases it before return */
927 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
929 struct inet6_ifaddr *ifa, *ifn;
930 struct inet6_dev *idev = ifp->idev;
932 int deleted = 0, onlink = 0;
933 unsigned long expires = jiffies;
935 spin_lock_bh(&ifp->state_lock);
937 ifp->state = INET6_IFADDR_STATE_DEAD;
938 spin_unlock_bh(&ifp->state_lock);
940 if (state == INET6_IFADDR_STATE_DEAD)
943 spin_lock_bh(&addrconf_hash_lock);
944 hlist_del_init_rcu(&ifp->addr_lst);
945 spin_unlock_bh(&addrconf_hash_lock);
947 write_lock_bh(&idev->lock);
948 #ifdef CONFIG_IPV6_PRIVACY
949 if (ifp->flags&IFA_F_TEMPORARY) {
950 list_del(&ifp->tmp_list);
952 in6_ifa_put(ifp->ifpub);
959 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
961 list_del_init(&ifp->if_list);
964 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
968 } else if (ifp->flags & IFA_F_PERMANENT) {
969 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
971 if (ifa->flags & IFA_F_PERMANENT) {
976 unsigned long lifetime;
981 spin_lock(&ifa->lock);
983 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
985 * Note: Because this address is
986 * not permanent, lifetime <
987 * LONG_MAX / HZ here.
989 if (time_before(expires,
990 ifa->tstamp + lifetime * HZ))
991 expires = ifa->tstamp + lifetime * HZ;
992 spin_unlock(&ifa->lock);
997 write_unlock_bh(&idev->lock);
999 addrconf_del_timer(ifp);
1001 ipv6_ifa_notify(RTM_DELADDR, ifp);
1003 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1006 * Purge or update corresponding prefix
1008 * 1) we don't purge prefix here if address was not permanent.
1009 * prefix is managed by its own lifetime.
1010 * 2) if there're no addresses, delete prefix.
1011 * 3) if there're still other permanent address(es),
1012 * corresponding prefix is still permanent.
1013 * 4) otherwise, update prefix lifetime to the
1014 * longest valid lifetime among the corresponding
1015 * addresses on the device.
1016 * Note: subsequent RA will update lifetime.
1020 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
1021 struct in6_addr prefix;
1022 struct rt6_info *rt;
1024 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
1026 rt = addrconf_get_prefix_route(&prefix,
1029 0, RTF_GATEWAY | RTF_DEFAULT);
1035 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
1036 rt6_set_expires(rt, expires);
1042 /* clean up prefsrc entries */
1043 rt6_remove_prefsrc(ifp);
1048 #ifdef CONFIG_IPV6_PRIVACY
1049 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1051 struct inet6_dev *idev = ifp->idev;
1052 struct in6_addr addr, *tmpaddr;
1053 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1054 unsigned long regen_advance;
1059 unsigned long now = jiffies;
1061 write_lock(&idev->lock);
1063 spin_lock_bh(&ift->lock);
1064 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1065 spin_unlock_bh(&ift->lock);
1072 if (idev->cnf.use_tempaddr <= 0) {
1073 write_unlock(&idev->lock);
1074 pr_info("%s: use_tempaddr is disabled\n", __func__);
1079 spin_lock_bh(&ifp->lock);
1080 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1081 idev->cnf.use_tempaddr = -1; /*XXX*/
1082 spin_unlock_bh(&ifp->lock);
1083 write_unlock(&idev->lock);
1084 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1091 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1092 __ipv6_try_regen_rndid(idev, tmpaddr);
1093 memcpy(&addr.s6_addr[8], idev->rndid, 8);
1094 age = (now - ifp->tstamp) / HZ;
1095 tmp_valid_lft = min_t(__u32,
1097 idev->cnf.temp_valid_lft + age);
1098 tmp_prefered_lft = min_t(__u32,
1100 idev->cnf.temp_prefered_lft + age -
1101 idev->cnf.max_desync_factor);
1102 tmp_plen = ifp->prefix_len;
1103 max_addresses = idev->cnf.max_addresses;
1104 tmp_tstamp = ifp->tstamp;
1105 spin_unlock_bh(&ifp->lock);
1107 regen_advance = idev->cnf.regen_max_retry *
1108 idev->cnf.dad_transmits *
1109 idev->nd_parms->retrans_time / HZ;
1110 write_unlock(&idev->lock);
1112 /* A temporary address is created only if this calculated Preferred
1113 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1114 * an implementation must not create a temporary address with a zero
1115 * Preferred Lifetime.
1117 if (tmp_prefered_lft <= regen_advance) {
1124 addr_flags = IFA_F_TEMPORARY;
1125 /* set in addrconf_prefix_rcv() */
1126 if (ifp->flags & IFA_F_OPTIMISTIC)
1127 addr_flags |= IFA_F_OPTIMISTIC;
1129 ift = !max_addresses ||
1130 ipv6_count_addresses(idev) < max_addresses ?
1131 ipv6_add_addr(idev, &addr, tmp_plen,
1132 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
1134 if (IS_ERR_OR_NULL(ift)) {
1137 pr_info("%s: retry temporary address regeneration\n", __func__);
1139 write_lock(&idev->lock);
1143 spin_lock_bh(&ift->lock);
1145 ift->valid_lft = tmp_valid_lft;
1146 ift->prefered_lft = tmp_prefered_lft;
1148 ift->tstamp = tmp_tstamp;
1149 spin_unlock_bh(&ift->lock);
1151 addrconf_dad_start(ift);
1160 * Choose an appropriate source address (RFC3484)
1163 IPV6_SADDR_RULE_INIT = 0,
1164 IPV6_SADDR_RULE_LOCAL,
1165 IPV6_SADDR_RULE_SCOPE,
1166 IPV6_SADDR_RULE_PREFERRED,
1167 #ifdef CONFIG_IPV6_MIP6
1168 IPV6_SADDR_RULE_HOA,
1170 IPV6_SADDR_RULE_OIF,
1171 IPV6_SADDR_RULE_LABEL,
1172 #ifdef CONFIG_IPV6_PRIVACY
1173 IPV6_SADDR_RULE_PRIVACY,
1175 IPV6_SADDR_RULE_ORCHID,
1176 IPV6_SADDR_RULE_PREFIX,
1177 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1178 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1183 struct ipv6_saddr_score {
1186 struct inet6_ifaddr *ifa;
1187 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1192 struct ipv6_saddr_dst {
1193 const struct in6_addr *addr;
1200 static inline int ipv6_saddr_preferred(int type)
1202 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1207 static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev)
1209 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1210 return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic;
1216 static int ipv6_get_saddr_eval(struct net *net,
1217 struct ipv6_saddr_score *score,
1218 struct ipv6_saddr_dst *dst,
1223 if (i <= score->rule) {
1225 case IPV6_SADDR_RULE_SCOPE:
1226 ret = score->scopedist;
1228 case IPV6_SADDR_RULE_PREFIX:
1229 ret = score->matchlen;
1232 ret = !!test_bit(i, score->scorebits);
1238 case IPV6_SADDR_RULE_INIT:
1239 /* Rule 0: remember if hiscore is not ready yet */
1242 case IPV6_SADDR_RULE_LOCAL:
1243 /* Rule 1: Prefer same address */
1244 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1246 case IPV6_SADDR_RULE_SCOPE:
1247 /* Rule 2: Prefer appropriate scope
1252 * ---+--+-+---> scope
1254 * | d is scope of the destination.
1256 * | \ <- smaller scope is better if
1257 * B-15 | \ if scope is enough for destinaion.
1258 * | ret = B - scope (-1 <= scope >= d <= 15).
1260 * |/ <- greater is better
1261 * -C / if scope is not enough for destination.
1262 * /| ret = scope - C (-1 <= d < scope <= 15).
1264 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1265 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1266 * Assume B = 0 and we get C > 29.
1268 ret = __ipv6_addr_src_scope(score->addr_type);
1269 if (ret >= dst->scope)
1272 ret -= 128; /* 30 is enough */
1273 score->scopedist = ret;
1275 case IPV6_SADDR_RULE_PREFERRED:
1277 /* Rule 3: Avoid deprecated and optimistic addresses */
1278 u8 avoid = IFA_F_DEPRECATED;
1280 if (!ipv6_use_optimistic_addr(score->ifa->idev))
1281 avoid |= IFA_F_OPTIMISTIC;
1282 ret = ipv6_saddr_preferred(score->addr_type) ||
1283 !(score->ifa->flags & avoid);
1286 #ifdef CONFIG_IPV6_MIP6
1287 case IPV6_SADDR_RULE_HOA:
1289 /* Rule 4: Prefer home address */
1290 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1291 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1295 case IPV6_SADDR_RULE_OIF:
1296 /* Rule 5: Prefer outgoing interface */
1297 ret = (!dst->ifindex ||
1298 dst->ifindex == score->ifa->idev->dev->ifindex);
1300 case IPV6_SADDR_RULE_LABEL:
1301 /* Rule 6: Prefer matching label */
1302 ret = ipv6_addr_label(net,
1303 &score->ifa->addr, score->addr_type,
1304 score->ifa->idev->dev->ifindex) == dst->label;
1306 #ifdef CONFIG_IPV6_PRIVACY
1307 case IPV6_SADDR_RULE_PRIVACY:
1309 /* Rule 7: Prefer public address
1310 * Note: prefer temporary address if use_tempaddr >= 2
1312 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1313 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1314 score->ifa->idev->cnf.use_tempaddr >= 2;
1315 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1319 case IPV6_SADDR_RULE_ORCHID:
1320 /* Rule 8-: Prefer ORCHID vs ORCHID or
1321 * non-ORCHID vs non-ORCHID
1323 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1324 ipv6_addr_orchid(dst->addr));
1326 case IPV6_SADDR_RULE_PREFIX:
1327 /* Rule 8: Use longest matching prefix */
1328 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1329 if (ret > score->ifa->prefix_len)
1330 ret = score->ifa->prefix_len;
1331 score->matchlen = ret;
1333 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1334 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1335 /* Optimistic addresses still have lower precedence than other
1336 * preferred addresses.
1338 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1346 __set_bit(i, score->scorebits);
1352 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1353 const struct in6_addr *daddr, unsigned int prefs,
1354 struct in6_addr *saddr)
1356 struct ipv6_saddr_score scores[2],
1357 *score = &scores[0], *hiscore = &scores[1];
1358 struct ipv6_saddr_dst dst;
1359 struct net_device *dev;
1362 dst_type = __ipv6_addr_type(daddr);
1364 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1365 dst.scope = __ipv6_addr_src_scope(dst_type);
1366 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1370 hiscore->ifa = NULL;
1374 for_each_netdev_rcu(net, dev) {
1375 struct inet6_dev *idev;
1377 /* Candidate Source Address (section 4)
1378 * - multicast and link-local destination address,
1379 * the set of candidate source address MUST only
1380 * include addresses assigned to interfaces
1381 * belonging to the same link as the outgoing
1383 * (- For site-local destination addresses, the
1384 * set of candidate source addresses MUST only
1385 * include addresses assigned to interfaces
1386 * belonging to the same site as the outgoing
1389 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1390 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1391 dst.ifindex && dev->ifindex != dst.ifindex)
1394 idev = __in6_dev_get(dev);
1398 read_lock_bh(&idev->lock);
1399 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1403 * - Tentative Address (RFC2462 section 5.4)
1404 * - A tentative address is not considered
1405 * "assigned to an interface" in the traditional
1406 * sense, unless it is also flagged as optimistic.
1407 * - Candidate Source Address (section 4)
1408 * - In any case, anycast addresses, multicast
1409 * addresses, and the unspecified address MUST
1410 * NOT be included in a candidate set.
1412 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1413 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1416 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1418 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1419 score->addr_type & IPV6_ADDR_MULTICAST)) {
1420 LIMIT_NETDEBUG(KERN_DEBUG
1421 "ADDRCONF: unspecified / multicast address "
1422 "assigned as unicast address on %s",
1428 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1430 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1431 int minihiscore, miniscore;
1433 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1434 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1436 if (minihiscore > miniscore) {
1437 if (i == IPV6_SADDR_RULE_SCOPE &&
1438 score->scopedist > 0) {
1441 * each remaining entry
1442 * has too small (not enough)
1443 * scope, because ifa entries
1444 * are sorted by their scope
1450 } else if (minihiscore < miniscore) {
1452 in6_ifa_put(hiscore->ifa);
1454 in6_ifa_hold(score->ifa);
1456 swap(hiscore, score);
1458 /* restore our iterator */
1459 score->ifa = hiscore->ifa;
1466 read_unlock_bh(&idev->lock);
1471 return -EADDRNOTAVAIL;
1473 *saddr = hiscore->ifa->addr;
1474 in6_ifa_put(hiscore->ifa);
1477 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1479 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1480 unsigned char banned_flags)
1482 struct inet6_dev *idev;
1483 int err = -EADDRNOTAVAIL;
1486 idev = __in6_dev_get(dev);
1488 struct inet6_ifaddr *ifp;
1490 read_lock_bh(&idev->lock);
1491 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1492 if (ifp->scope == IFA_LINK &&
1493 !(ifp->flags & banned_flags)) {
1499 read_unlock_bh(&idev->lock);
1505 static int ipv6_count_addresses(struct inet6_dev *idev)
1508 struct inet6_ifaddr *ifp;
1510 read_lock_bh(&idev->lock);
1511 list_for_each_entry(ifp, &idev->addr_list, if_list)
1513 read_unlock_bh(&idev->lock);
1517 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1518 const struct net_device *dev, int strict)
1520 struct inet6_ifaddr *ifp;
1521 unsigned int hash = inet6_addr_hash(addr);
1524 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1525 if (!net_eq(dev_net(ifp->idev->dev), net))
1527 if (ipv6_addr_equal(&ifp->addr, addr) &&
1528 (!(ifp->flags&IFA_F_TENTATIVE) ||
1529 (ipv6_use_optimistic_addr(ifp->idev) &&
1530 ifp->flags&IFA_F_OPTIMISTIC)) &&
1531 (dev == NULL || ifp->idev->dev == dev ||
1532 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1533 rcu_read_unlock_bh();
1538 rcu_read_unlock_bh();
1541 EXPORT_SYMBOL(ipv6_chk_addr);
1543 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1544 struct net_device *dev)
1546 unsigned int hash = inet6_addr_hash(addr);
1547 struct inet6_ifaddr *ifp;
1549 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1550 if (!net_eq(dev_net(ifp->idev->dev), net))
1552 if (ipv6_addr_equal(&ifp->addr, addr)) {
1553 if (dev == NULL || ifp->idev->dev == dev)
1560 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1562 struct inet6_dev *idev;
1563 struct inet6_ifaddr *ifa;
1568 idev = __in6_dev_get(dev);
1570 read_lock_bh(&idev->lock);
1571 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1572 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1577 read_unlock_bh(&idev->lock);
1582 EXPORT_SYMBOL(ipv6_chk_prefix);
1584 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1585 struct net_device *dev, int strict)
1587 struct inet6_ifaddr *ifp, *result = NULL;
1588 unsigned int hash = inet6_addr_hash(addr);
1591 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1592 if (!net_eq(dev_net(ifp->idev->dev), net))
1594 if (ipv6_addr_equal(&ifp->addr, addr)) {
1595 if (dev == NULL || ifp->idev->dev == dev ||
1596 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1603 rcu_read_unlock_bh();
1608 /* Gets referenced address, destroys ifaddr */
1610 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1612 if (ifp->flags&IFA_F_PERMANENT) {
1613 spin_lock_bh(&ifp->lock);
1614 addrconf_del_timer(ifp);
1615 ifp->flags |= IFA_F_TENTATIVE;
1617 ifp->flags |= IFA_F_DADFAILED;
1618 spin_unlock_bh(&ifp->lock);
1620 ipv6_ifa_notify(0, ifp);
1622 #ifdef CONFIG_IPV6_PRIVACY
1623 } else if (ifp->flags&IFA_F_TEMPORARY) {
1624 struct inet6_ifaddr *ifpub;
1625 spin_lock_bh(&ifp->lock);
1628 in6_ifa_hold(ifpub);
1629 spin_unlock_bh(&ifp->lock);
1630 ipv6_create_tempaddr(ifpub, ifp);
1633 spin_unlock_bh(&ifp->lock);
1641 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1645 spin_lock(&ifp->state_lock);
1646 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1647 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1650 spin_unlock(&ifp->state_lock);
1655 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1657 struct inet6_dev *idev = ifp->idev;
1659 if (addrconf_dad_end(ifp)) {
1664 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1665 ifp->idev->dev->name, &ifp->addr);
1667 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1668 struct in6_addr addr;
1670 addr.s6_addr32[0] = htonl(0xfe800000);
1671 addr.s6_addr32[1] = 0;
1673 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1674 ipv6_addr_equal(&ifp->addr, &addr)) {
1675 /* DAD failed for link-local based on MAC address */
1676 idev->cnf.disable_ipv6 = 1;
1678 pr_info("%s: IPv6 being disabled!\n",
1679 ifp->idev->dev->name);
1683 addrconf_dad_stop(ifp, 1);
1686 /* Join to solicited addr multicast group. */
1688 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1690 struct in6_addr maddr;
1692 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1695 addrconf_addr_solict_mult(addr, &maddr);
1696 ipv6_dev_mc_inc(dev, &maddr);
1699 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1701 struct in6_addr maddr;
1703 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1706 addrconf_addr_solict_mult(addr, &maddr);
1707 __ipv6_dev_mc_dec(idev, &maddr);
1710 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1712 struct in6_addr addr;
1713 if (ifp->prefix_len == 127) /* RFC 6164 */
1715 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1716 if (ipv6_addr_any(&addr))
1718 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1721 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1723 struct in6_addr addr;
1724 if (ifp->prefix_len == 127) /* RFC 6164 */
1726 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1727 if (ipv6_addr_any(&addr))
1729 __ipv6_dev_ac_dec(ifp->idev, &addr);
1732 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1734 if (dev->addr_len != ETH_ALEN)
1736 memcpy(eui, dev->dev_addr, 3);
1737 memcpy(eui + 5, dev->dev_addr + 3, 3);
1740 * The zSeries OSA network cards can be shared among various
1741 * OS instances, but the OSA cards have only one MAC address.
1742 * This leads to duplicate address conflicts in conjunction
1743 * with IPv6 if more than one instance uses the same card.
1745 * The driver for these cards can deliver a unique 16-bit
1746 * identifier for each instance sharing the same card. It is
1747 * placed instead of 0xFFFE in the interface identifier. The
1748 * "u" bit of the interface identifier is not inverted in this
1749 * case. Hence the resulting interface identifier has local
1750 * scope according to RFC2373.
1753 eui[3] = (dev->dev_id >> 8) & 0xFF;
1754 eui[4] = dev->dev_id & 0xFF;
1763 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1765 if (dev->addr_len != IEEE802154_ADDR_LEN)
1767 memcpy(eui, dev->dev_addr, 8);
1772 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1774 union fwnet_hwaddr *ha;
1776 if (dev->addr_len != FWNET_ALEN)
1779 ha = (union fwnet_hwaddr *)dev->dev_addr;
1781 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1786 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1788 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1789 if (dev->addr_len != ARCNET_ALEN)
1792 eui[7] = *(u8 *)dev->dev_addr;
1796 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1798 if (dev->addr_len != INFINIBAND_ALEN)
1800 memcpy(eui, dev->dev_addr + 12, 8);
1805 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1809 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1810 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1811 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1812 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1813 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1814 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1818 memcpy(eui + 4, &addr, 4);
1822 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1824 if (dev->priv_flags & IFF_ISATAP)
1825 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1829 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1831 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1834 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1836 switch (dev->type) {
1839 return addrconf_ifid_eui48(eui, dev);
1841 return addrconf_ifid_arcnet(eui, dev);
1842 case ARPHRD_INFINIBAND:
1843 return addrconf_ifid_infiniband(eui, dev);
1845 return addrconf_ifid_sit(eui, dev);
1847 return addrconf_ifid_gre(eui, dev);
1848 case ARPHRD_IEEE802154:
1849 return addrconf_ifid_eui64(eui, dev);
1850 case ARPHRD_IEEE1394:
1851 return addrconf_ifid_ieee1394(eui, dev);
1856 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1859 struct inet6_ifaddr *ifp;
1861 read_lock_bh(&idev->lock);
1862 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1863 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1864 memcpy(eui, ifp->addr.s6_addr+8, 8);
1869 read_unlock_bh(&idev->lock);
1873 #ifdef CONFIG_IPV6_PRIVACY
1874 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1875 static void __ipv6_regen_rndid(struct inet6_dev *idev)
1878 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1879 idev->rndid[0] &= ~0x02;
1882 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1883 * check if generated address is not inappropriate
1885 * - Reserved subnet anycast (RFC 2526)
1886 * 11111101 11....11 1xxxxxxx
1887 * - ISATAP (RFC4214) 6.1
1888 * 00-00-5E-FE-xx-xx-xx-xx
1890 * - XXX: already assigned to an address on the device
1892 if (idev->rndid[0] == 0xfd &&
1893 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1894 (idev->rndid[7]&0x80))
1896 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1897 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1899 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1904 static void ipv6_regen_rndid(unsigned long data)
1906 struct inet6_dev *idev = (struct inet6_dev *) data;
1907 unsigned long expires;
1910 write_lock_bh(&idev->lock);
1915 __ipv6_regen_rndid(idev);
1918 idev->cnf.temp_prefered_lft * HZ -
1919 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1920 idev->cnf.max_desync_factor * HZ;
1921 if (time_before(expires, jiffies)) {
1922 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
1923 __func__, idev->dev->name);
1927 if (!mod_timer(&idev->regen_timer, expires))
1931 write_unlock_bh(&idev->lock);
1932 rcu_read_unlock_bh();
1936 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
1938 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1939 __ipv6_regen_rndid(idev);
1943 u32 addrconf_rt_table(const struct net_device *dev, u32 default_table) {
1944 /* Determines into what table to put autoconf PIO/RIO/default routes
1945 * learned on this device.
1947 * - If 0, use the same table for every device. This puts routes into
1948 * one of RT_TABLE_{PREFIX,INFO,DFLT} depending on the type of route
1949 * (but note that these three are currently all equal to
1951 * - If > 0, use the specified table.
1952 * - If < 0, put routes into table dev->ifindex + (-rt_table).
1954 struct inet6_dev *idev = in6_dev_get(dev);
1956 int sysctl = idev->cnf.accept_ra_rt_table;
1958 table = default_table;
1959 } else if (sysctl > 0) {
1960 table = (u32) sysctl;
1962 table = (unsigned) dev->ifindex + (-sysctl);
1973 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1974 unsigned long expires, u32 flags)
1976 struct fib6_config cfg = {
1977 .fc_table = addrconf_rt_table(dev, RT6_TABLE_PREFIX),
1978 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1979 .fc_ifindex = dev->ifindex,
1980 .fc_expires = expires,
1982 .fc_flags = RTF_UP | flags,
1983 .fc_nlinfo.nl_net = dev_net(dev),
1984 .fc_protocol = RTPROT_KERNEL,
1989 /* Prevent useless cloning on PtP SIT.
1990 This thing is done here expecting that the whole
1991 class of non-broadcast devices need not cloning.
1993 #if IS_ENABLED(CONFIG_IPV6_SIT)
1994 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1995 cfg.fc_flags |= RTF_NONEXTHOP;
1998 ip6_route_add(&cfg);
2002 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2004 const struct net_device *dev,
2005 u32 flags, u32 noflags)
2007 struct fib6_node *fn;
2008 struct rt6_info *rt = NULL;
2009 struct fib6_table *table;
2011 table = fib6_get_table(dev_net(dev),
2012 addrconf_rt_table(dev, RT6_TABLE_PREFIX));
2016 read_lock_bh(&table->tb6_lock);
2017 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2020 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2021 if (rt->dst.dev->ifindex != dev->ifindex)
2023 if ((rt->rt6i_flags & flags) != flags)
2025 if ((rt->rt6i_flags & noflags) != 0)
2031 read_unlock_bh(&table->tb6_lock);
2036 /* Create "default" multicast route to the interface */
2038 static void addrconf_add_mroute(struct net_device *dev)
2040 struct fib6_config cfg = {
2041 .fc_table = RT6_TABLE_LOCAL,
2042 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2043 .fc_ifindex = dev->ifindex,
2046 .fc_nlinfo.nl_net = dev_net(dev),
2049 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2051 ip6_route_add(&cfg);
2054 #if IS_ENABLED(CONFIG_IPV6_SIT)
2055 static void sit_route_add(struct net_device *dev)
2057 struct fib6_config cfg = {
2058 .fc_table = RT6_TABLE_MAIN,
2059 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2060 .fc_ifindex = dev->ifindex,
2062 .fc_flags = RTF_UP | RTF_NONEXTHOP,
2063 .fc_nlinfo.nl_net = dev_net(dev),
2066 /* prefix length - 96 bits "::d.d.d.d" */
2067 ip6_route_add(&cfg);
2071 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2073 struct inet6_dev *idev;
2077 idev = ipv6_find_idev(dev);
2079 return ERR_PTR(-ENOBUFS);
2081 if (idev->cnf.disable_ipv6)
2082 return ERR_PTR(-EACCES);
2084 /* Add default multicast route */
2085 if (!(dev->flags & IFF_LOOPBACK))
2086 addrconf_add_mroute(dev);
2091 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2093 struct prefix_info *pinfo;
2097 struct inet6_dev *in6_dev;
2098 struct net *net = dev_net(dev);
2100 pinfo = (struct prefix_info *) opt;
2102 if (len < sizeof(struct prefix_info)) {
2103 ADBG(("addrconf: prefix option too short\n"));
2108 * Validation checks ([ADDRCONF], page 19)
2111 addr_type = ipv6_addr_type(&pinfo->prefix);
2113 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2116 valid_lft = ntohl(pinfo->valid);
2117 prefered_lft = ntohl(pinfo->prefered);
2119 if (prefered_lft > valid_lft) {
2120 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2124 in6_dev = in6_dev_get(dev);
2126 if (in6_dev == NULL) {
2127 net_dbg_ratelimited("addrconf: device %s not configured\n",
2133 * Two things going on here:
2134 * 1) Add routes for on-link prefixes
2135 * 2) Configure prefixes with the auto flag set
2138 if (pinfo->onlink) {
2139 struct rt6_info *rt;
2140 unsigned long rt_expires;
2142 /* Avoid arithmetic overflow. Really, we could
2143 * save rt_expires in seconds, likely valid_lft,
2144 * but it would require division in fib gc, that it
2148 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2150 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2152 if (addrconf_finite_timeout(rt_expires))
2155 rt = addrconf_get_prefix_route(&pinfo->prefix,
2158 RTF_ADDRCONF | RTF_PREFIX_RT,
2159 RTF_GATEWAY | RTF_DEFAULT);
2162 /* Autoconf prefix route */
2163 if (valid_lft == 0) {
2166 } else if (addrconf_finite_timeout(rt_expires)) {
2168 rt6_set_expires(rt, jiffies + rt_expires);
2170 rt6_clean_expires(rt);
2172 } else if (valid_lft) {
2173 clock_t expires = 0;
2174 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2175 if (addrconf_finite_timeout(rt_expires)) {
2177 flags |= RTF_EXPIRES;
2178 expires = jiffies_to_clock_t(rt_expires);
2180 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2181 dev, expires, flags);
2186 /* Try to figure out our local address for this prefix */
2188 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2189 struct inet6_ifaddr *ifp;
2190 struct in6_addr addr;
2191 int create = 0, update_lft = 0;
2192 bool tokenized = false;
2194 if (pinfo->prefix_len == 64) {
2195 memcpy(&addr, &pinfo->prefix, 8);
2197 if (!ipv6_addr_any(&in6_dev->token)) {
2198 read_lock_bh(&in6_dev->lock);
2199 memcpy(addr.s6_addr + 8,
2200 in6_dev->token.s6_addr + 8, 8);
2201 read_unlock_bh(&in6_dev->lock);
2203 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2204 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2205 in6_dev_put(in6_dev);
2210 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2212 in6_dev_put(in6_dev);
2217 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
2219 if (ifp == NULL && valid_lft) {
2220 int max_addresses = in6_dev->cnf.max_addresses;
2223 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2224 if (in6_dev->cnf.optimistic_dad &&
2225 !net->ipv6.devconf_all->forwarding && sllao)
2226 addr_flags = IFA_F_OPTIMISTIC;
2229 /* Do not allow to create too much of autoconfigured
2230 * addresses; this would be too easy way to crash kernel.
2232 if (!max_addresses ||
2233 ipv6_count_addresses(in6_dev) < max_addresses)
2234 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
2235 addr_type&IPV6_ADDR_SCOPE_MASK,
2238 if (IS_ERR_OR_NULL(ifp)) {
2239 in6_dev_put(in6_dev);
2243 update_lft = create = 1;
2244 ifp->cstamp = jiffies;
2245 ifp->tokenized = tokenized;
2246 addrconf_dad_start(ifp);
2252 #ifdef CONFIG_IPV6_PRIVACY
2253 struct inet6_ifaddr *ift;
2257 /* update lifetime (RFC2462 5.5.3 e) */
2258 spin_lock(&ifp->lock);
2260 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2261 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2264 if (!update_lft && stored_lft) {
2265 if (valid_lft > MIN_VALID_LIFETIME ||
2266 valid_lft > stored_lft)
2268 else if (stored_lft <= MIN_VALID_LIFETIME) {
2269 /* valid_lft <= stored_lft is always true */
2271 * RFC 4862 Section 5.5.3e:
2272 * "Note that the preferred lifetime of
2273 * the corresponding address is always
2274 * reset to the Preferred Lifetime in
2275 * the received Prefix Information
2276 * option, regardless of whether the
2277 * valid lifetime is also reset or
2280 * So if the preferred lifetime in
2281 * this advertisement is different
2282 * than what we have stored, but the
2283 * valid lifetime is invalid, just
2284 * reset prefered_lft.
2286 * We must set the valid lifetime
2287 * to the stored lifetime since we'll
2288 * be updating the timestamp below,
2289 * else we'll set it back to the
2292 if (prefered_lft != ifp->prefered_lft) {
2293 valid_lft = stored_lft;
2297 valid_lft = MIN_VALID_LIFETIME;
2298 if (valid_lft < prefered_lft)
2299 prefered_lft = valid_lft;
2305 ifp->valid_lft = valid_lft;
2306 ifp->prefered_lft = prefered_lft;
2309 ifp->flags &= ~IFA_F_DEPRECATED;
2310 spin_unlock(&ifp->lock);
2312 if (!(flags&IFA_F_TENTATIVE))
2313 ipv6_ifa_notify(0, ifp);
2315 spin_unlock(&ifp->lock);
2317 #ifdef CONFIG_IPV6_PRIVACY
2318 read_lock_bh(&in6_dev->lock);
2319 /* update all temporary addresses in the list */
2320 list_for_each_entry(ift, &in6_dev->tempaddr_list,
2322 int age, max_valid, max_prefered;
2324 if (ifp != ift->ifpub)
2328 * RFC 4941 section 3.3:
2329 * If a received option will extend the lifetime
2330 * of a public address, the lifetimes of
2331 * temporary addresses should be extended,
2332 * subject to the overall constraint that no
2333 * temporary addresses should ever remain
2334 * "valid" or "preferred" for a time longer than
2335 * (TEMP_VALID_LIFETIME) or
2336 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR),
2339 age = (now - ift->cstamp) / HZ;
2340 max_valid = in6_dev->cnf.temp_valid_lft - age;
2344 max_prefered = in6_dev->cnf.temp_prefered_lft -
2345 in6_dev->cnf.max_desync_factor -
2347 if (max_prefered < 0)
2350 if (valid_lft > max_valid)
2351 valid_lft = max_valid;
2353 if (prefered_lft > max_prefered)
2354 prefered_lft = max_prefered;
2356 spin_lock(&ift->lock);
2358 ift->valid_lft = valid_lft;
2359 ift->prefered_lft = prefered_lft;
2361 if (prefered_lft > 0)
2362 ift->flags &= ~IFA_F_DEPRECATED;
2364 spin_unlock(&ift->lock);
2365 if (!(flags&IFA_F_TENTATIVE))
2366 ipv6_ifa_notify(0, ift);
2369 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
2371 * When a new public address is created as
2372 * described in [ADDRCONF], also create a new
2373 * temporary address. Also create a temporary
2374 * address if it's enabled but no temporary
2375 * address currently exists.
2377 read_unlock_bh(&in6_dev->lock);
2378 ipv6_create_tempaddr(ifp, NULL);
2380 read_unlock_bh(&in6_dev->lock);
2387 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2388 in6_dev_put(in6_dev);
2392 * Set destination address.
2393 * Special case for SIT interfaces where we create a new "virtual"
2396 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2398 struct in6_ifreq ireq;
2399 struct net_device *dev;
2405 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2408 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2414 #if IS_ENABLED(CONFIG_IPV6_SIT)
2415 if (dev->type == ARPHRD_SIT) {
2416 const struct net_device_ops *ops = dev->netdev_ops;
2418 struct ip_tunnel_parm p;
2420 err = -EADDRNOTAVAIL;
2421 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2424 memset(&p, 0, sizeof(p));
2425 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2429 p.iph.protocol = IPPROTO_IPV6;
2431 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2433 if (ops->ndo_do_ioctl) {
2434 mm_segment_t oldfs = get_fs();
2437 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2444 dev = __dev_get_by_name(net, p.name);
2447 err = dev_open(dev);
2458 * Manual configuration of address on an interface
2460 static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx,
2461 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2464 struct inet6_ifaddr *ifp;
2465 struct inet6_dev *idev;
2466 struct net_device *dev;
2470 unsigned long timeout;
2477 /* check the lifetime */
2478 if (!valid_lft || prefered_lft > valid_lft)
2481 dev = __dev_get_by_index(net, ifindex);
2485 idev = addrconf_add_dev(dev);
2487 return PTR_ERR(idev);
2489 scope = ipv6_addr_scope(pfx);
2491 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2492 if (addrconf_finite_timeout(timeout)) {
2493 expires = jiffies_to_clock_t(timeout * HZ);
2494 valid_lft = timeout;
2495 flags = RTF_EXPIRES;
2499 ifa_flags |= IFA_F_PERMANENT;
2502 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2503 if (addrconf_finite_timeout(timeout)) {
2505 ifa_flags |= IFA_F_DEPRECATED;
2506 prefered_lft = timeout;
2509 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2512 spin_lock_bh(&ifp->lock);
2513 ifp->valid_lft = valid_lft;
2514 ifp->prefered_lft = prefered_lft;
2515 ifp->tstamp = jiffies;
2516 spin_unlock_bh(&ifp->lock);
2518 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2521 * Note that section 3.1 of RFC 4429 indicates
2522 * that the Optimistic flag should not be set for
2523 * manually configured addresses
2525 addrconf_dad_start(ifp);
2531 return PTR_ERR(ifp);
2534 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
2537 struct inet6_ifaddr *ifp;
2538 struct inet6_dev *idev;
2539 struct net_device *dev;
2544 dev = __dev_get_by_index(net, ifindex);
2548 if ((idev = __in6_dev_get(dev)) == NULL)
2551 read_lock_bh(&idev->lock);
2552 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2553 if (ifp->prefix_len == plen &&
2554 ipv6_addr_equal(pfx, &ifp->addr)) {
2556 read_unlock_bh(&idev->lock);
2560 /* If the last address is deleted administratively,
2561 disable IPv6 on this interface.
2563 if (list_empty(&idev->addr_list))
2564 addrconf_ifdown(idev->dev, 1);
2568 read_unlock_bh(&idev->lock);
2569 return -EADDRNOTAVAIL;
2573 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2575 struct in6_ifreq ireq;
2578 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2581 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2585 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2586 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2587 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2592 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2594 struct in6_ifreq ireq;
2597 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2600 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2604 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2605 ireq.ifr6_prefixlen);
2610 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2611 int plen, int scope)
2613 struct inet6_ifaddr *ifp;
2615 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2617 spin_lock_bh(&ifp->lock);
2618 ifp->flags &= ~IFA_F_TENTATIVE;
2619 spin_unlock_bh(&ifp->lock);
2620 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2625 #if IS_ENABLED(CONFIG_IPV6_SIT)
2626 static void sit_add_v4_addrs(struct inet6_dev *idev)
2628 struct in6_addr addr;
2629 struct net_device *dev;
2630 struct net *net = dev_net(idev->dev);
2635 memset(&addr, 0, sizeof(struct in6_addr));
2636 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2638 if (idev->dev->flags&IFF_POINTOPOINT) {
2639 addr.s6_addr32[0] = htonl(0xfe800000);
2642 scope = IPV6_ADDR_COMPATv4;
2645 if (addr.s6_addr32[3]) {
2646 add_addr(idev, &addr, 128, scope);
2650 for_each_netdev(net, dev) {
2651 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2652 if (in_dev && (dev->flags & IFF_UP)) {
2653 struct in_ifaddr *ifa;
2657 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2660 addr.s6_addr32[3] = ifa->ifa_local;
2662 if (ifa->ifa_scope == RT_SCOPE_LINK)
2664 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2665 if (idev->dev->flags&IFF_POINTOPOINT)
2669 if (idev->dev->flags&IFF_POINTOPOINT)
2674 add_addr(idev, &addr, plen, flag);
2681 static void init_loopback(struct net_device *dev)
2683 struct inet6_dev *idev;
2684 struct net_device *sp_dev;
2685 struct inet6_ifaddr *sp_ifa;
2686 struct rt6_info *sp_rt;
2692 if ((idev = ipv6_find_idev(dev)) == NULL) {
2693 pr_debug("%s: add_dev failed\n", __func__);
2697 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2699 /* Add routes to other interface's IPv6 addresses */
2700 for_each_netdev(dev_net(dev), sp_dev) {
2701 if (!strcmp(sp_dev->name, dev->name))
2704 idev = __in6_dev_get(sp_dev);
2708 read_lock_bh(&idev->lock);
2709 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2711 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2717 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, 0);
2719 /* Failure cases are ignored */
2720 if (!IS_ERR(sp_rt)) {
2725 read_unlock_bh(&idev->lock);
2729 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
2731 struct inet6_ifaddr *ifp;
2732 u32 addr_flags = IFA_F_PERMANENT;
2734 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2735 if (idev->cnf.optimistic_dad &&
2736 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2737 addr_flags |= IFA_F_OPTIMISTIC;
2741 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2743 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2744 addrconf_dad_start(ifp);
2749 static void addrconf_dev_config(struct net_device *dev)
2751 struct in6_addr addr;
2752 struct inet6_dev *idev;
2756 if ((dev->type != ARPHRD_ETHER) &&
2757 (dev->type != ARPHRD_FDDI) &&
2758 (dev->type != ARPHRD_ARCNET) &&
2759 (dev->type != ARPHRD_INFINIBAND) &&
2760 (dev->type != ARPHRD_IEEE802154) &&
2761 (dev->type != ARPHRD_IEEE1394)) {
2762 /* Alas, we support only Ethernet autoconfiguration. */
2766 idev = addrconf_add_dev(dev);
2770 memset(&addr, 0, sizeof(struct in6_addr));
2771 addr.s6_addr32[0] = htonl(0xFE800000);
2773 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2774 addrconf_add_linklocal(idev, &addr);
2777 #if IS_ENABLED(CONFIG_IPV6_SIT)
2778 static void addrconf_sit_config(struct net_device *dev)
2780 struct inet6_dev *idev;
2785 * Configure the tunnel with one of our IPv4
2786 * addresses... we should configure all of
2787 * our v4 addrs in the tunnel
2790 if ((idev = ipv6_find_idev(dev)) == NULL) {
2791 pr_debug("%s: add_dev failed\n", __func__);
2795 if (dev->priv_flags & IFF_ISATAP) {
2796 struct in6_addr addr;
2798 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2799 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2800 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2801 addrconf_add_linklocal(idev, &addr);
2805 sit_add_v4_addrs(idev);
2807 if (dev->flags&IFF_POINTOPOINT)
2808 addrconf_add_mroute(dev);
2814 #if IS_ENABLED(CONFIG_NET_IPGRE)
2815 static void addrconf_gre_config(struct net_device *dev)
2817 struct inet6_dev *idev;
2818 struct in6_addr addr;
2820 pr_info("%s(%s)\n", __func__, dev->name);
2824 if ((idev = ipv6_find_idev(dev)) == NULL) {
2825 pr_debug("%s: add_dev failed\n", __func__);
2829 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2830 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2832 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2833 addrconf_add_linklocal(idev, &addr);
2838 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2840 struct in6_addr lladdr;
2842 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2843 addrconf_add_linklocal(idev, &lladdr);
2849 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2851 struct net_device *link_dev;
2852 struct net *net = dev_net(idev->dev);
2854 /* first try to inherit the link-local address from the link device */
2855 if (idev->dev->iflink &&
2856 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2857 if (!ipv6_inherit_linklocal(idev, link_dev))
2860 /* then try to inherit it from any device */
2861 for_each_netdev(net, link_dev) {
2862 if (!ipv6_inherit_linklocal(idev, link_dev))
2865 pr_debug("init ip6-ip6: add_linklocal failed\n");
2869 * Autoconfigure tunnel with a link-local address so routing protocols,
2870 * DHCPv6, MLD etc. can be run over the virtual link
2873 static void addrconf_ip6_tnl_config(struct net_device *dev)
2875 struct inet6_dev *idev;
2879 idev = addrconf_add_dev(dev);
2881 pr_debug("init ip6-ip6: add_dev failed\n");
2884 ip6_tnl_add_linklocal(idev);
2887 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2890 struct net_device *dev = (struct net_device *) data;
2891 struct inet6_dev *idev = __in6_dev_get(dev);
2892 int run_pending = 0;
2896 case NETDEV_REGISTER:
2897 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2898 idev = ipv6_add_dev(dev);
2900 return notifier_from_errno(-ENOMEM);
2906 if (dev->flags & IFF_SLAVE)
2909 if (event == NETDEV_UP) {
2910 if (!addrconf_qdisc_ok(dev)) {
2911 /* device is not ready yet. */
2912 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
2917 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2918 idev = ipv6_add_dev(dev);
2921 idev->if_flags |= IF_READY;
2925 if (!addrconf_qdisc_ok(dev)) {
2926 /* device is still not ready. */
2931 if (idev->if_flags & IF_READY)
2932 /* device is already configured. */
2934 idev->if_flags |= IF_READY;
2937 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
2943 switch (dev->type) {
2944 #if IS_ENABLED(CONFIG_IPV6_SIT)
2946 addrconf_sit_config(dev);
2949 #if IS_ENABLED(CONFIG_NET_IPGRE)
2951 addrconf_gre_config(dev);
2954 case ARPHRD_TUNNEL6:
2955 addrconf_ip6_tnl_config(dev);
2957 case ARPHRD_LOOPBACK:
2962 addrconf_dev_config(dev);
2968 addrconf_dad_run(idev);
2971 * If the MTU changed during the interface down,
2972 * when the interface up, the changed MTU must be
2973 * reflected in the idev as well as routers.
2975 if (idev->cnf.mtu6 != dev->mtu &&
2976 dev->mtu >= IPV6_MIN_MTU) {
2977 rt6_mtu_change(dev, dev->mtu);
2978 idev->cnf.mtu6 = dev->mtu;
2980 idev->tstamp = jiffies;
2981 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2984 * If the changed mtu during down is lower than
2985 * IPV6_MIN_MTU stop IPv6 on this interface.
2987 if (dev->mtu < IPV6_MIN_MTU)
2988 addrconf_ifdown(dev, 1);
2992 case NETDEV_CHANGEMTU:
2993 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2994 rt6_mtu_change(dev, dev->mtu);
2995 idev->cnf.mtu6 = dev->mtu;
2999 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3000 idev = ipv6_add_dev(dev);
3006 * MTU falled under IPV6_MIN_MTU.
3007 * Stop IPv6 on this interface.
3011 case NETDEV_UNREGISTER:
3013 * Remove all addresses from this interface.
3015 addrconf_ifdown(dev, event != NETDEV_DOWN);
3018 case NETDEV_CHANGENAME:
3020 snmp6_unregister_dev(idev);
3021 addrconf_sysctl_unregister(idev);
3022 addrconf_sysctl_register(idev);
3023 err = snmp6_register_dev(idev);
3025 return notifier_from_errno(err);
3029 case NETDEV_PRE_TYPE_CHANGE:
3030 case NETDEV_POST_TYPE_CHANGE:
3031 addrconf_type_change(dev, event);
3039 * addrconf module should be notified of a device going up
3041 static struct notifier_block ipv6_dev_notf = {
3042 .notifier_call = addrconf_notify,
3045 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3047 struct inet6_dev *idev;
3050 idev = __in6_dev_get(dev);
3052 if (event == NETDEV_POST_TYPE_CHANGE)
3053 ipv6_mc_remap(idev);
3054 else if (event == NETDEV_PRE_TYPE_CHANGE)
3055 ipv6_mc_unmap(idev);
3058 static int addrconf_ifdown(struct net_device *dev, int how)
3060 struct net *net = dev_net(dev);
3061 struct inet6_dev *idev;
3062 struct inet6_ifaddr *ifa;
3067 rt6_ifdown(net, dev);
3068 neigh_ifdown(&nd_tbl, dev);
3070 idev = __in6_dev_get(dev);
3075 * Step 1: remove reference to ipv6 device from parent device.
3081 /* protected by rtnl_lock */
3082 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3084 /* Step 1.5: remove snmp6 entry */
3085 snmp6_unregister_dev(idev);
3089 /* Step 2: clear hash table */
3090 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3091 struct hlist_head *h = &inet6_addr_lst[i];
3093 spin_lock_bh(&addrconf_hash_lock);
3095 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3096 if (ifa->idev == idev) {
3097 hlist_del_init_rcu(&ifa->addr_lst);
3098 addrconf_del_timer(ifa);
3102 spin_unlock_bh(&addrconf_hash_lock);
3105 write_lock_bh(&idev->lock);
3107 /* Step 2: clear flags for stateless addrconf */
3109 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3111 #ifdef CONFIG_IPV6_PRIVACY
3112 if (how && del_timer(&idev->regen_timer))
3115 /* Step 3: clear tempaddr list */
3116 while (!list_empty(&idev->tempaddr_list)) {
3117 ifa = list_first_entry(&idev->tempaddr_list,
3118 struct inet6_ifaddr, tmp_list);
3119 list_del(&ifa->tmp_list);
3120 write_unlock_bh(&idev->lock);
3121 spin_lock_bh(&ifa->lock);
3124 in6_ifa_put(ifa->ifpub);
3127 spin_unlock_bh(&ifa->lock);
3129 write_lock_bh(&idev->lock);
3133 while (!list_empty(&idev->addr_list)) {
3134 ifa = list_first_entry(&idev->addr_list,
3135 struct inet6_ifaddr, if_list);
3136 addrconf_del_timer(ifa);
3138 list_del(&ifa->if_list);
3140 write_unlock_bh(&idev->lock);
3142 spin_lock_bh(&ifa->state_lock);
3144 ifa->state = INET6_IFADDR_STATE_DEAD;
3145 spin_unlock_bh(&ifa->state_lock);
3147 if (state != INET6_IFADDR_STATE_DEAD) {
3148 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3149 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3153 write_lock_bh(&idev->lock);
3156 write_unlock_bh(&idev->lock);
3158 /* Step 5: Discard anycast and multicast list */
3160 ipv6_ac_destroy_dev(idev);
3161 ipv6_mc_destroy_dev(idev);
3166 idev->tstamp = jiffies;
3168 /* Last: Shot the device (if unregistered) */
3170 addrconf_sysctl_unregister(idev);
3171 neigh_parms_release(&nd_tbl, idev->nd_parms);
3172 neigh_ifdown(&nd_tbl, dev);
3178 static void addrconf_rs_timer(unsigned long data)
3180 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
3181 struct inet6_dev *idev = ifp->idev;
3183 read_lock(&idev->lock);
3184 if (idev->dead || !(idev->if_flags & IF_READY))
3187 if (!ipv6_accept_ra(idev))
3190 /* Announcement received after solicitation was sent */
3191 if (idev->if_flags & IF_RA_RCVD)
3194 spin_lock(&ifp->lock);
3195 if (ifp->probes++ < idev->cnf.rtr_solicits) {
3196 /* The wait after the last probe can be shorter */
3197 addrconf_mod_timer(ifp, AC_RS,
3198 (ifp->probes == idev->cnf.rtr_solicits) ?
3199 idev->cnf.rtr_solicit_delay :
3200 idev->cnf.rtr_solicit_interval);
3201 spin_unlock(&ifp->lock);
3203 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
3205 spin_unlock(&ifp->lock);
3207 * Note: we do not support deprecated "all on-link"
3208 * assumption any longer.
3210 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3214 read_unlock(&idev->lock);
3219 * Duplicate Address Detection
3221 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3223 unsigned long rand_num;
3224 struct inet6_dev *idev = ifp->idev;
3226 if (ifp->flags & IFA_F_OPTIMISTIC)
3229 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
3231 ifp->probes = idev->cnf.dad_transmits;
3232 addrconf_mod_timer(ifp, AC_DAD, rand_num);
3235 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3237 struct inet6_dev *idev = ifp->idev;
3238 struct net_device *dev = idev->dev;
3240 addrconf_join_solict(dev, &ifp->addr);
3242 net_srandom(ifp->addr.s6_addr32[3]);
3244 read_lock_bh(&idev->lock);
3245 spin_lock(&ifp->lock);
3246 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3249 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3250 idev->cnf.accept_dad < 1 ||
3251 !(ifp->flags&IFA_F_TENTATIVE) ||
3252 ifp->flags & IFA_F_NODAD) {
3253 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3254 spin_unlock(&ifp->lock);
3255 read_unlock_bh(&idev->lock);
3257 addrconf_dad_completed(ifp);
3261 if (!(idev->if_flags & IF_READY)) {
3262 spin_unlock(&ifp->lock);
3263 read_unlock_bh(&idev->lock);
3265 * If the device is not ready:
3266 * - keep it tentative if it is a permanent address.
3267 * - otherwise, kill it.
3270 addrconf_dad_stop(ifp, 0);
3275 * Optimistic nodes can start receiving
3278 if (ifp->flags & IFA_F_OPTIMISTIC) {
3279 ip6_ins_rt(ifp->rt);
3280 if (ipv6_use_optimistic_addr(idev)) {
3281 /* Because optimistic nodes can use this address,
3282 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3284 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3288 addrconf_dad_kick(ifp);
3290 spin_unlock(&ifp->lock);
3291 read_unlock_bh(&idev->lock);
3294 static void addrconf_dad_timer(unsigned long data)
3296 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
3297 struct inet6_dev *idev = ifp->idev;
3298 struct in6_addr mcaddr;
3300 if (!ifp->probes && addrconf_dad_end(ifp))
3303 read_lock(&idev->lock);
3304 if (idev->dead || !(idev->if_flags & IF_READY)) {
3305 read_unlock(&idev->lock);
3309 spin_lock(&ifp->lock);
3310 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3311 spin_unlock(&ifp->lock);
3312 read_unlock(&idev->lock);
3316 if (ifp->probes == 0) {
3318 * DAD was successful
3321 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3322 spin_unlock(&ifp->lock);
3323 read_unlock(&idev->lock);
3325 addrconf_dad_completed(ifp);
3331 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
3332 spin_unlock(&ifp->lock);
3333 read_unlock(&idev->lock);
3335 /* send a neighbour solicitation for our addr */
3336 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3337 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
3342 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3344 struct net_device *dev = ifp->idev->dev;
3347 * Configure the address for reception. Now it is valid.
3350 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3352 /* If added prefix is link local and we are prepared to process
3353 router advertisements, start sending router solicitations.
3356 if (ipv6_accept_ra(ifp->idev) &&
3357 ifp->idev->cnf.rtr_solicits > 0 &&
3358 (dev->flags&IFF_LOOPBACK) == 0 &&
3359 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
3361 * If a host as already performed a random delay
3362 * [...] as part of DAD [...] there is no need
3363 * to delay again before sending the first RS
3365 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
3367 spin_lock_bh(&ifp->lock);
3369 ifp->idev->if_flags |= IF_RS_SENT;
3370 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
3371 spin_unlock_bh(&ifp->lock);
3375 static void addrconf_dad_run(struct inet6_dev *idev)
3377 struct inet6_ifaddr *ifp;
3379 read_lock_bh(&idev->lock);
3380 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3381 spin_lock(&ifp->lock);
3382 if (ifp->flags & IFA_F_TENTATIVE &&
3383 ifp->state == INET6_IFADDR_STATE_DAD)
3384 addrconf_dad_kick(ifp);
3385 spin_unlock(&ifp->lock);
3387 read_unlock_bh(&idev->lock);
3390 #ifdef CONFIG_PROC_FS
3391 struct if6_iter_state {
3392 struct seq_net_private p;
3397 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3399 struct inet6_ifaddr *ifa = NULL;
3400 struct if6_iter_state *state = seq->private;
3401 struct net *net = seq_file_net(seq);
3404 /* initial bucket if pos is 0 */
3410 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3411 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
3413 if (!net_eq(dev_net(ifa->idev->dev), net))
3415 /* sync with offset */
3416 if (p < state->offset) {
3424 /* prepare for next bucket */
3431 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3432 struct inet6_ifaddr *ifa)
3434 struct if6_iter_state *state = seq->private;
3435 struct net *net = seq_file_net(seq);
3437 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
3438 if (!net_eq(dev_net(ifa->idev->dev), net))
3444 while (++state->bucket < IN6_ADDR_HSIZE) {
3446 hlist_for_each_entry_rcu_bh(ifa,
3447 &inet6_addr_lst[state->bucket], addr_lst) {
3448 if (!net_eq(dev_net(ifa->idev->dev), net))
3458 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3462 return if6_get_first(seq, *pos);
3465 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3467 struct inet6_ifaddr *ifa;
3469 ifa = if6_get_next(seq, v);
3474 static void if6_seq_stop(struct seq_file *seq, void *v)
3477 rcu_read_unlock_bh();
3480 static int if6_seq_show(struct seq_file *seq, void *v)
3482 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3483 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3485 ifp->idev->dev->ifindex,
3489 ifp->idev->dev->name);
3493 static const struct seq_operations if6_seq_ops = {
3494 .start = if6_seq_start,
3495 .next = if6_seq_next,
3496 .show = if6_seq_show,
3497 .stop = if6_seq_stop,
3500 static int if6_seq_open(struct inode *inode, struct file *file)
3502 return seq_open_net(inode, file, &if6_seq_ops,
3503 sizeof(struct if6_iter_state));
3506 static const struct file_operations if6_fops = {
3507 .owner = THIS_MODULE,
3508 .open = if6_seq_open,
3510 .llseek = seq_lseek,
3511 .release = seq_release_net,
3514 static int __net_init if6_proc_net_init(struct net *net)
3516 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
3521 static void __net_exit if6_proc_net_exit(struct net *net)
3523 remove_proc_entry("if_inet6", net->proc_net);
3526 static struct pernet_operations if6_proc_net_ops = {
3527 .init = if6_proc_net_init,
3528 .exit = if6_proc_net_exit,
3531 int __init if6_proc_init(void)
3533 return register_pernet_subsys(&if6_proc_net_ops);
3536 void if6_proc_exit(void)
3538 unregister_pernet_subsys(&if6_proc_net_ops);
3540 #endif /* CONFIG_PROC_FS */
3542 #if IS_ENABLED(CONFIG_IPV6_MIP6)
3543 /* Check if address is a home address configured on any interface. */
3544 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3547 struct inet6_ifaddr *ifp = NULL;
3548 unsigned int hash = inet6_addr_hash(addr);
3551 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
3552 if (!net_eq(dev_net(ifp->idev->dev), net))
3554 if (ipv6_addr_equal(&ifp->addr, addr) &&
3555 (ifp->flags & IFA_F_HOMEADDRESS)) {
3560 rcu_read_unlock_bh();
3566 * Periodic address status verification
3569 static void addrconf_verify(unsigned long foo)
3571 unsigned long now, next, next_sec, next_sched;
3572 struct inet6_ifaddr *ifp;
3576 spin_lock(&addrconf_verify_lock);
3578 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3580 del_timer(&addr_chk_timer);
3582 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3584 hlist_for_each_entry_rcu_bh(ifp,
3585 &inet6_addr_lst[i], addr_lst) {
3588 if (ifp->flags & IFA_F_PERMANENT)
3591 spin_lock(&ifp->lock);
3592 /* We try to batch several events at once. */
3593 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3595 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3596 age >= ifp->valid_lft) {
3597 spin_unlock(&ifp->lock);
3601 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3602 spin_unlock(&ifp->lock);
3604 } else if (age >= ifp->prefered_lft) {
3605 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3608 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3610 ifp->flags |= IFA_F_DEPRECATED;
3613 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3614 next = ifp->tstamp + ifp->valid_lft * HZ;
3616 spin_unlock(&ifp->lock);
3621 ipv6_ifa_notify(0, ifp);
3625 #ifdef CONFIG_IPV6_PRIVACY
3626 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3627 !(ifp->flags&IFA_F_TENTATIVE)) {
3628 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3629 ifp->idev->cnf.dad_transmits *
3630 ifp->idev->nd_parms->retrans_time / HZ;
3632 if (age >= ifp->prefered_lft - regen_advance) {
3633 struct inet6_ifaddr *ifpub = ifp->ifpub;
3634 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3635 next = ifp->tstamp + ifp->prefered_lft * HZ;
3636 if (!ifp->regen_count && ifpub) {
3639 in6_ifa_hold(ifpub);
3640 spin_unlock(&ifp->lock);
3642 spin_lock(&ifpub->lock);
3643 ifpub->regen_count = 0;
3644 spin_unlock(&ifpub->lock);
3645 ipv6_create_tempaddr(ifpub, ifp);
3650 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3651 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3652 spin_unlock(&ifp->lock);
3655 /* ifp->prefered_lft <= ifp->valid_lft */
3656 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3657 next = ifp->tstamp + ifp->prefered_lft * HZ;
3658 spin_unlock(&ifp->lock);
3663 next_sec = round_jiffies_up(next);
3666 /* If rounded timeout is accurate enough, accept it. */
3667 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3668 next_sched = next_sec;
3670 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3671 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3672 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3674 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3675 now, next, next_sec, next_sched));
3677 addr_chk_timer.expires = next_sched;
3678 add_timer(&addr_chk_timer);
3679 spin_unlock(&addrconf_verify_lock);
3680 rcu_read_unlock_bh();
3683 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3685 struct in6_addr *pfx = NULL;
3688 pfx = nla_data(addr);
3691 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3694 pfx = nla_data(local);
3700 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3701 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3702 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3703 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3707 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
3709 struct net *net = sock_net(skb->sk);
3710 struct ifaddrmsg *ifm;
3711 struct nlattr *tb[IFA_MAX+1];
3712 struct in6_addr *pfx;
3715 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3719 ifm = nlmsg_data(nlh);
3720 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3724 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3727 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3728 u32 prefered_lft, u32 valid_lft)
3732 unsigned long timeout;
3734 if (!valid_lft || (prefered_lft > valid_lft))
3737 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3738 if (addrconf_finite_timeout(timeout)) {
3739 expires = jiffies_to_clock_t(timeout * HZ);
3740 valid_lft = timeout;
3741 flags = RTF_EXPIRES;
3745 ifa_flags |= IFA_F_PERMANENT;
3748 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3749 if (addrconf_finite_timeout(timeout)) {
3751 ifa_flags |= IFA_F_DEPRECATED;
3752 prefered_lft = timeout;
3755 spin_lock_bh(&ifp->lock);
3756 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3757 ifp->tstamp = jiffies;
3758 ifp->valid_lft = valid_lft;
3759 ifp->prefered_lft = prefered_lft;
3761 spin_unlock_bh(&ifp->lock);
3762 if (!(ifp->flags&IFA_F_TENTATIVE))
3763 ipv6_ifa_notify(0, ifp);
3765 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3773 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
3775 struct net *net = sock_net(skb->sk);
3776 struct ifaddrmsg *ifm;
3777 struct nlattr *tb[IFA_MAX+1];
3778 struct in6_addr *pfx;
3779 struct inet6_ifaddr *ifa;
3780 struct net_device *dev;
3781 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3785 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3789 ifm = nlmsg_data(nlh);
3790 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3794 if (tb[IFA_CACHEINFO]) {
3795 struct ifa_cacheinfo *ci;
3797 ci = nla_data(tb[IFA_CACHEINFO]);
3798 valid_lft = ci->ifa_valid;
3799 preferred_lft = ci->ifa_prefered;
3801 preferred_lft = INFINITY_LIFE_TIME;
3802 valid_lft = INFINITY_LIFE_TIME;
3805 dev = __dev_get_by_index(net, ifm->ifa_index);
3809 /* We ignore other flags so far. */
3810 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3812 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3815 * It would be best to check for !NLM_F_CREATE here but
3816 * userspace alreay relies on not having to provide this.
3818 return inet6_addr_add(net, ifm->ifa_index, pfx,
3819 ifm->ifa_prefixlen, ifa_flags,
3820 preferred_lft, valid_lft);
3823 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3824 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3827 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3834 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3835 u8 scope, int ifindex)
3837 struct ifaddrmsg *ifm;
3839 ifm = nlmsg_data(nlh);
3840 ifm->ifa_family = AF_INET6;
3841 ifm->ifa_prefixlen = prefixlen;
3842 ifm->ifa_flags = flags;
3843 ifm->ifa_scope = scope;
3844 ifm->ifa_index = ifindex;
3847 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3848 unsigned long tstamp, u32 preferred, u32 valid)
3850 struct ifa_cacheinfo ci;
3852 ci.cstamp = cstamp_delta(cstamp);
3853 ci.tstamp = cstamp_delta(tstamp);
3854 ci.ifa_prefered = preferred;
3855 ci.ifa_valid = valid;
3857 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3860 static inline int rt_scope(int ifa_scope)
3862 if (ifa_scope & IFA_HOST)
3863 return RT_SCOPE_HOST;
3864 else if (ifa_scope & IFA_LINK)
3865 return RT_SCOPE_LINK;
3866 else if (ifa_scope & IFA_SITE)
3867 return RT_SCOPE_SITE;
3869 return RT_SCOPE_UNIVERSE;
3872 static inline int inet6_ifaddr_msgsize(void)
3874 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3875 + nla_total_size(16) /* IFA_ADDRESS */
3876 + nla_total_size(sizeof(struct ifa_cacheinfo));
3879 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3880 u32 portid, u32 seq, int event, unsigned int flags)
3882 struct nlmsghdr *nlh;
3883 u32 preferred, valid;
3885 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3889 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3890 ifa->idev->dev->ifindex);
3892 if (!(ifa->flags&IFA_F_PERMANENT)) {
3893 preferred = ifa->prefered_lft;
3894 valid = ifa->valid_lft;
3895 if (preferred != INFINITY_LIFE_TIME) {
3896 long tval = (jiffies - ifa->tstamp)/HZ;
3897 if (preferred > tval)
3901 if (valid != INFINITY_LIFE_TIME) {
3909 preferred = INFINITY_LIFE_TIME;
3910 valid = INFINITY_LIFE_TIME;
3913 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3914 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3915 nlmsg_cancel(skb, nlh);
3919 return nlmsg_end(skb, nlh);
3922 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3923 u32 portid, u32 seq, int event, u16 flags)
3925 struct nlmsghdr *nlh;
3926 u8 scope = RT_SCOPE_UNIVERSE;
3927 int ifindex = ifmca->idev->dev->ifindex;
3929 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3930 scope = RT_SCOPE_SITE;
3932 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3936 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3937 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3938 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3939 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3940 nlmsg_cancel(skb, nlh);
3944 return nlmsg_end(skb, nlh);
3947 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3948 u32 portid, u32 seq, int event, unsigned int flags)
3950 struct nlmsghdr *nlh;
3951 u8 scope = RT_SCOPE_UNIVERSE;
3952 int ifindex = ifaca->aca_idev->dev->ifindex;
3954 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3955 scope = RT_SCOPE_SITE;
3957 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3961 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3962 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3963 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3964 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3965 nlmsg_cancel(skb, nlh);
3969 return nlmsg_end(skb, nlh);
3978 /* called with rcu_read_lock() */
3979 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3980 struct netlink_callback *cb, enum addr_type_t type,
3981 int s_ip_idx, int *p_ip_idx)
3983 struct ifmcaddr6 *ifmca;
3984 struct ifacaddr6 *ifaca;
3986 int ip_idx = *p_ip_idx;
3988 read_lock_bh(&idev->lock);
3990 case UNICAST_ADDR: {
3991 struct inet6_ifaddr *ifa;
3993 /* unicast address incl. temp addr */
3994 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3995 if (++ip_idx < s_ip_idx)
3997 err = inet6_fill_ifaddr(skb, ifa,
3998 NETLINK_CB(cb->skb).portid,
4004 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4008 case MULTICAST_ADDR:
4009 /* multicast address */
4010 for (ifmca = idev->mc_list; ifmca;
4011 ifmca = ifmca->next, ip_idx++) {
4012 if (ip_idx < s_ip_idx)
4014 err = inet6_fill_ifmcaddr(skb, ifmca,
4015 NETLINK_CB(cb->skb).portid,
4024 /* anycast address */
4025 for (ifaca = idev->ac_list; ifaca;
4026 ifaca = ifaca->aca_next, ip_idx++) {
4027 if (ip_idx < s_ip_idx)
4029 err = inet6_fill_ifacaddr(skb, ifaca,
4030 NETLINK_CB(cb->skb).portid,
4041 read_unlock_bh(&idev->lock);
4046 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4047 enum addr_type_t type)
4049 struct net *net = sock_net(skb->sk);
4052 int s_idx, s_ip_idx;
4053 struct net_device *dev;
4054 struct inet6_dev *idev;
4055 struct hlist_head *head;
4058 s_idx = idx = cb->args[1];
4059 s_ip_idx = ip_idx = cb->args[2];
4062 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4063 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4065 head = &net->dev_index_head[h];
4066 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4069 if (h > s_h || idx > s_idx)
4072 idev = __in6_dev_get(dev);
4076 if (in6_dump_addrs(idev, skb, cb, type,
4077 s_ip_idx, &ip_idx) <= 0)
4087 cb->args[2] = ip_idx;
4092 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4094 enum addr_type_t type = UNICAST_ADDR;
4096 return inet6_dump_addr(skb, cb, type);
4099 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4101 enum addr_type_t type = MULTICAST_ADDR;
4103 return inet6_dump_addr(skb, cb, type);
4107 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4109 enum addr_type_t type = ANYCAST_ADDR;
4111 return inet6_dump_addr(skb, cb, type);
4114 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
4116 struct net *net = sock_net(in_skb->sk);
4117 struct ifaddrmsg *ifm;
4118 struct nlattr *tb[IFA_MAX+1];
4119 struct in6_addr *addr = NULL;
4120 struct net_device *dev = NULL;
4121 struct inet6_ifaddr *ifa;
4122 struct sk_buff *skb;
4125 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4129 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
4135 ifm = nlmsg_data(nlh);
4137 dev = __dev_get_by_index(net, ifm->ifa_index);
4139 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4141 err = -EADDRNOTAVAIL;
4145 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4151 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4152 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4154 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4155 WARN_ON(err == -EMSGSIZE);
4159 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4166 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4168 struct sk_buff *skb;
4169 struct net *net = dev_net(ifa->idev->dev);
4172 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4176 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4178 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4179 WARN_ON(err == -EMSGSIZE);
4183 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4187 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4190 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4191 __s32 *array, int bytes)
4193 BUG_ON(bytes < (DEVCONF_MAX * 4));
4195 memset(array, 0, bytes);
4196 array[DEVCONF_FORWARDING] = cnf->forwarding;
4197 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4198 array[DEVCONF_MTU6] = cnf->mtu6;
4199 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4200 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4201 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4202 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4203 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4204 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4205 jiffies_to_msecs(cnf->rtr_solicit_interval);
4206 array[DEVCONF_RTR_SOLICIT_DELAY] =
4207 jiffies_to_msecs(cnf->rtr_solicit_delay);
4208 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4209 #ifdef CONFIG_IPV6_PRIVACY
4210 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4211 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4212 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4213 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4214 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4216 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4217 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4218 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4219 #ifdef CONFIG_IPV6_ROUTER_PREF
4220 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4221 array[DEVCONF_RTR_PROBE_INTERVAL] =
4222 jiffies_to_msecs(cnf->rtr_probe_interval);
4223 #ifdef CONFIG_IPV6_ROUTE_INFO
4224 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4227 array[DEVCONF_ACCEPT_RA_RT_TABLE] = cnf->accept_ra_rt_table;
4228 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4229 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4230 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4231 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4232 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
4234 #ifdef CONFIG_IPV6_MROUTE
4235 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4237 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4238 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4239 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4240 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4243 static inline size_t inet6_ifla6_size(void)
4245 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4246 + nla_total_size(sizeof(struct ifla_cacheinfo))
4247 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4248 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4249 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4250 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
4253 static inline size_t inet6_if_nlmsg_size(void)
4255 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4256 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4257 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4258 + nla_total_size(4) /* IFLA_MTU */
4259 + nla_total_size(4) /* IFLA_LINK */
4260 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4263 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4264 int items, int bytes)
4267 int pad = bytes - sizeof(u64) * items;
4270 /* Use put_unaligned() because stats may not be aligned for u64. */
4271 put_unaligned(items, &stats[0]);
4272 for (i = 1; i < items; i++)
4273 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4275 memset(&stats[items], 0, pad);
4278 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
4279 int items, int bytes, size_t syncpoff)
4282 int pad = bytes - sizeof(u64) * items;
4285 /* Use put_unaligned() because stats may not be aligned for u64. */
4286 put_unaligned(items, &stats[0]);
4287 for (i = 1; i < items; i++)
4288 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4290 memset(&stats[items], 0, pad);
4293 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4297 case IFLA_INET6_STATS:
4298 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
4299 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
4301 case IFLA_INET6_ICMP6STATS:
4302 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
4307 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4310 struct ifla_cacheinfo ci;
4312 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4313 goto nla_put_failure;
4314 ci.max_reasm_len = IPV6_MAXPLEN;
4315 ci.tstamp = cstamp_delta(idev->tstamp);
4316 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4317 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
4318 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4319 goto nla_put_failure;
4320 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4322 goto nla_put_failure;
4323 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4325 /* XXX - MC not implemented */
4327 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4329 goto nla_put_failure;
4330 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4332 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4334 goto nla_put_failure;
4335 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4337 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4339 goto nla_put_failure;
4340 read_lock_bh(&idev->lock);
4341 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4342 read_unlock_bh(&idev->lock);
4350 static size_t inet6_get_link_af_size(const struct net_device *dev)
4352 if (!__in6_dev_get(dev))
4355 return inet6_ifla6_size();
4358 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4360 struct inet6_dev *idev = __in6_dev_get(dev);
4365 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4371 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4373 struct inet6_ifaddr *ifp;
4374 struct net_device *dev = idev->dev;
4375 bool update_rs = false;
4376 struct in6_addr ll_addr;
4380 if (ipv6_addr_any(token))
4382 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4384 if (!ipv6_accept_ra(idev))
4386 if (idev->cnf.rtr_solicits <= 0)
4389 write_lock_bh(&idev->lock);
4391 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4392 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4394 write_unlock_bh(&idev->lock);
4396 if (!idev->dead && (idev->if_flags & IF_READY) &&
4397 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4398 IFA_F_OPTIMISTIC)) {
4400 /* If we're not ready, then normal ifup will take care
4401 * of this. Otherwise, we need to request our rs here.
4403 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4407 write_lock_bh(&idev->lock);
4410 idev->if_flags |= IF_RS_SENT;
4412 /* Well, that's kinda nasty ... */
4413 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4414 spin_lock(&ifp->lock);
4415 if (ifp->tokenized) {
4417 ifp->prefered_lft = 0;
4419 spin_unlock(&ifp->lock);
4422 write_unlock_bh(&idev->lock);
4426 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4429 struct inet6_dev *idev = __in6_dev_get(dev);
4430 struct nlattr *tb[IFLA_INET6_MAX + 1];
4433 return -EAFNOSUPPORT;
4435 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4438 if (tb[IFLA_INET6_TOKEN])
4439 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
4444 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4445 u32 portid, u32 seq, int event, unsigned int flags)
4447 struct net_device *dev = idev->dev;
4448 struct ifinfomsg *hdr;
4449 struct nlmsghdr *nlh;
4452 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
4456 hdr = nlmsg_data(nlh);
4457 hdr->ifi_family = AF_INET6;
4459 hdr->ifi_type = dev->type;
4460 hdr->ifi_index = dev->ifindex;
4461 hdr->ifi_flags = dev_get_flags(dev);
4462 hdr->ifi_change = 0;
4464 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4466 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4467 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4468 (dev->ifindex != dev->iflink &&
4469 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4470 goto nla_put_failure;
4471 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4472 if (protoinfo == NULL)
4473 goto nla_put_failure;
4475 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4476 goto nla_put_failure;
4478 nla_nest_end(skb, protoinfo);
4479 return nlmsg_end(skb, nlh);
4482 nlmsg_cancel(skb, nlh);
4486 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4488 struct net *net = sock_net(skb->sk);
4491 struct net_device *dev;
4492 struct inet6_dev *idev;
4493 struct hlist_head *head;
4496 s_idx = cb->args[1];
4499 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4501 head = &net->dev_index_head[h];
4502 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4505 idev = __in6_dev_get(dev);
4508 if (inet6_fill_ifinfo(skb, idev,
4509 NETLINK_CB(cb->skb).portid,
4511 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4525 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4527 struct sk_buff *skb;
4528 struct net *net = dev_net(idev->dev);
4531 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4535 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4537 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4538 WARN_ON(err == -EMSGSIZE);
4542 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4546 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4549 static inline size_t inet6_prefix_nlmsg_size(void)
4551 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4552 + nla_total_size(sizeof(struct in6_addr))
4553 + nla_total_size(sizeof(struct prefix_cacheinfo));
4556 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4557 struct prefix_info *pinfo, u32 portid, u32 seq,
4558 int event, unsigned int flags)
4560 struct prefixmsg *pmsg;
4561 struct nlmsghdr *nlh;
4562 struct prefix_cacheinfo ci;
4564 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
4568 pmsg = nlmsg_data(nlh);
4569 pmsg->prefix_family = AF_INET6;
4570 pmsg->prefix_pad1 = 0;
4571 pmsg->prefix_pad2 = 0;
4572 pmsg->prefix_ifindex = idev->dev->ifindex;
4573 pmsg->prefix_len = pinfo->prefix_len;
4574 pmsg->prefix_type = pinfo->type;
4575 pmsg->prefix_pad3 = 0;
4576 pmsg->prefix_flags = 0;
4578 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4579 if (pinfo->autoconf)
4580 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4582 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4583 goto nla_put_failure;
4584 ci.preferred_time = ntohl(pinfo->prefered);
4585 ci.valid_time = ntohl(pinfo->valid);
4586 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4587 goto nla_put_failure;
4588 return nlmsg_end(skb, nlh);
4591 nlmsg_cancel(skb, nlh);
4595 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4596 struct prefix_info *pinfo)
4598 struct sk_buff *skb;
4599 struct net *net = dev_net(idev->dev);
4602 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4606 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4608 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4609 WARN_ON(err == -EMSGSIZE);
4613 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4617 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4620 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4622 struct net *net = dev_net(ifp->idev->dev);
4624 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4629 * If the address was optimistic
4630 * we inserted the route at the start of
4631 * our DAD process, so we don't need
4634 if (!(ifp->rt->rt6i_node))
4635 ip6_ins_rt(ifp->rt);
4636 if (ifp->idev->cnf.forwarding)
4637 addrconf_join_anycast(ifp);
4640 if (ifp->idev->cnf.forwarding)
4641 addrconf_leave_anycast(ifp);
4642 addrconf_leave_solict(ifp->idev, &ifp->addr);
4643 dst_hold(&ifp->rt->dst);
4645 if (ip6_del_rt(ifp->rt))
4646 dst_free(&ifp->rt->dst);
4649 atomic_inc(&net->ipv6.dev_addr_genid);
4652 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4655 if (likely(ifp->idev->dead == 0))
4656 __ipv6_ifa_notify(event, ifp);
4657 rcu_read_unlock_bh();
4660 #ifdef CONFIG_SYSCTL
4663 int addrconf_sysctl_forward(ctl_table *ctl, int write,
4664 void __user *buffer, size_t *lenp, loff_t *ppos)
4666 int *valp = ctl->data;
4673 * ctl->data points to idev->cnf.forwarding, we should
4674 * not modify it until we get the rtnl lock.
4679 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4682 ret = addrconf_fixup_forwarding(ctl, valp, val);
4688 static void dev_disable_change(struct inet6_dev *idev)
4690 if (!idev || !idev->dev)
4693 if (idev->cnf.disable_ipv6)
4694 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4696 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4699 static void addrconf_disable_change(struct net *net, __s32 newf)
4701 struct net_device *dev;
4702 struct inet6_dev *idev;
4705 for_each_netdev_rcu(net, dev) {
4706 idev = __in6_dev_get(dev);
4708 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4709 idev->cnf.disable_ipv6 = newf;
4711 dev_disable_change(idev);
4717 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
4722 if (!rtnl_trylock())
4723 return restart_syscall();
4725 net = (struct net *)table->extra2;
4729 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4734 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4735 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4736 addrconf_disable_change(net, newf);
4737 } else if ((!newf) ^ (!old))
4738 dev_disable_change((struct inet6_dev *)table->extra1);
4745 int addrconf_sysctl_disable(ctl_table *ctl, int write,
4746 void __user *buffer, size_t *lenp, loff_t *ppos)
4748 int *valp = ctl->data;
4755 * ctl->data points to idev->cnf.disable_ipv6, we should
4756 * not modify it until we get the rtnl lock.
4761 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4764 ret = addrconf_disable_ipv6(ctl, valp, val);
4770 static struct addrconf_sysctl_table
4772 struct ctl_table_header *sysctl_header;
4773 ctl_table addrconf_vars[DEVCONF_MAX+1];
4774 } addrconf_sysctl __read_mostly = {
4775 .sysctl_header = NULL,
4778 .procname = "forwarding",
4779 .data = &ipv6_devconf.forwarding,
4780 .maxlen = sizeof(int),
4782 .proc_handler = addrconf_sysctl_forward,
4785 .procname = "hop_limit",
4786 .data = &ipv6_devconf.hop_limit,
4787 .maxlen = sizeof(int),
4789 .proc_handler = proc_dointvec,
4793 .data = &ipv6_devconf.mtu6,
4794 .maxlen = sizeof(int),
4796 .proc_handler = proc_dointvec,
4799 .procname = "accept_ra",
4800 .data = &ipv6_devconf.accept_ra,
4801 .maxlen = sizeof(int),
4803 .proc_handler = proc_dointvec,
4806 .procname = "accept_redirects",
4807 .data = &ipv6_devconf.accept_redirects,
4808 .maxlen = sizeof(int),
4810 .proc_handler = proc_dointvec,
4813 .procname = "autoconf",
4814 .data = &ipv6_devconf.autoconf,
4815 .maxlen = sizeof(int),
4817 .proc_handler = proc_dointvec,
4820 .procname = "dad_transmits",
4821 .data = &ipv6_devconf.dad_transmits,
4822 .maxlen = sizeof(int),
4824 .proc_handler = proc_dointvec,
4827 .procname = "router_solicitations",
4828 .data = &ipv6_devconf.rtr_solicits,
4829 .maxlen = sizeof(int),
4831 .proc_handler = proc_dointvec,
4834 .procname = "router_solicitation_interval",
4835 .data = &ipv6_devconf.rtr_solicit_interval,
4836 .maxlen = sizeof(int),
4838 .proc_handler = proc_dointvec_jiffies,
4841 .procname = "router_solicitation_delay",
4842 .data = &ipv6_devconf.rtr_solicit_delay,
4843 .maxlen = sizeof(int),
4845 .proc_handler = proc_dointvec_jiffies,
4848 .procname = "force_mld_version",
4849 .data = &ipv6_devconf.force_mld_version,
4850 .maxlen = sizeof(int),
4852 .proc_handler = proc_dointvec,
4854 #ifdef CONFIG_IPV6_PRIVACY
4856 .procname = "use_tempaddr",
4857 .data = &ipv6_devconf.use_tempaddr,
4858 .maxlen = sizeof(int),
4860 .proc_handler = proc_dointvec,
4863 .procname = "temp_valid_lft",
4864 .data = &ipv6_devconf.temp_valid_lft,
4865 .maxlen = sizeof(int),
4867 .proc_handler = proc_dointvec,
4870 .procname = "temp_prefered_lft",
4871 .data = &ipv6_devconf.temp_prefered_lft,
4872 .maxlen = sizeof(int),
4874 .proc_handler = proc_dointvec,
4877 .procname = "regen_max_retry",
4878 .data = &ipv6_devconf.regen_max_retry,
4879 .maxlen = sizeof(int),
4881 .proc_handler = proc_dointvec,
4884 .procname = "max_desync_factor",
4885 .data = &ipv6_devconf.max_desync_factor,
4886 .maxlen = sizeof(int),
4888 .proc_handler = proc_dointvec,
4892 .procname = "max_addresses",
4893 .data = &ipv6_devconf.max_addresses,
4894 .maxlen = sizeof(int),
4896 .proc_handler = proc_dointvec,
4899 .procname = "accept_ra_defrtr",
4900 .data = &ipv6_devconf.accept_ra_defrtr,
4901 .maxlen = sizeof(int),
4903 .proc_handler = proc_dointvec,
4906 .procname = "accept_ra_pinfo",
4907 .data = &ipv6_devconf.accept_ra_pinfo,
4908 .maxlen = sizeof(int),
4910 .proc_handler = proc_dointvec,
4912 #ifdef CONFIG_IPV6_ROUTER_PREF
4914 .procname = "accept_ra_rtr_pref",
4915 .data = &ipv6_devconf.accept_ra_rtr_pref,
4916 .maxlen = sizeof(int),
4918 .proc_handler = proc_dointvec,
4921 .procname = "router_probe_interval",
4922 .data = &ipv6_devconf.rtr_probe_interval,
4923 .maxlen = sizeof(int),
4925 .proc_handler = proc_dointvec_jiffies,
4927 #ifdef CONFIG_IPV6_ROUTE_INFO
4929 .procname = "accept_ra_rt_info_max_plen",
4930 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4931 .maxlen = sizeof(int),
4933 .proc_handler = proc_dointvec,
4938 .procname = "accept_ra_rt_table",
4939 .data = &ipv6_devconf.accept_ra_rt_table,
4940 .maxlen = sizeof(int),
4942 .proc_handler = proc_dointvec,
4945 .procname = "proxy_ndp",
4946 .data = &ipv6_devconf.proxy_ndp,
4947 .maxlen = sizeof(int),
4949 .proc_handler = proc_dointvec,
4952 .procname = "accept_source_route",
4953 .data = &ipv6_devconf.accept_source_route,
4954 .maxlen = sizeof(int),
4956 .proc_handler = proc_dointvec,
4958 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4960 .procname = "optimistic_dad",
4961 .data = &ipv6_devconf.optimistic_dad,
4962 .maxlen = sizeof(int),
4964 .proc_handler = proc_dointvec,
4968 .procname = "use_optimistic",
4969 .data = &ipv6_devconf.use_optimistic,
4970 .maxlen = sizeof(int),
4972 .proc_handler = proc_dointvec,
4976 #ifdef CONFIG_IPV6_MROUTE
4978 .procname = "mc_forwarding",
4979 .data = &ipv6_devconf.mc_forwarding,
4980 .maxlen = sizeof(int),
4982 .proc_handler = proc_dointvec,
4986 .procname = "disable_ipv6",
4987 .data = &ipv6_devconf.disable_ipv6,
4988 .maxlen = sizeof(int),
4990 .proc_handler = addrconf_sysctl_disable,
4993 .procname = "accept_dad",
4994 .data = &ipv6_devconf.accept_dad,
4995 .maxlen = sizeof(int),
4997 .proc_handler = proc_dointvec,
5000 .procname = "force_tllao",
5001 .data = &ipv6_devconf.force_tllao,
5002 .maxlen = sizeof(int),
5004 .proc_handler = proc_dointvec
5007 .procname = "ndisc_notify",
5008 .data = &ipv6_devconf.ndisc_notify,
5009 .maxlen = sizeof(int),
5011 .proc_handler = proc_dointvec
5019 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
5020 struct inet6_dev *idev, struct ipv6_devconf *p)
5023 struct addrconf_sysctl_table *t;
5024 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
5026 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
5030 for (i = 0; t->addrconf_vars[i].data; i++) {
5031 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
5032 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
5033 t->addrconf_vars[i].extra2 = net;
5036 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
5038 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
5039 if (t->sysctl_header == NULL)
5051 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5053 struct addrconf_sysctl_table *t;
5055 if (p->sysctl == NULL)
5060 unregister_net_sysctl_table(t->sysctl_header);
5064 static void addrconf_sysctl_register(struct inet6_dev *idev)
5066 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
5067 &ndisc_ifinfo_sysctl_change);
5068 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
5072 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
5074 __addrconf_sysctl_unregister(&idev->cnf);
5075 neigh_sysctl_unregister(idev->nd_parms);
5081 static int __net_init addrconf_init_net(struct net *net)
5084 struct ipv6_devconf *all, *dflt;
5086 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
5090 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
5092 goto err_alloc_dflt;
5094 /* these will be inherited by all namespaces */
5095 dflt->autoconf = ipv6_defaults.autoconf;
5096 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
5098 net->ipv6.devconf_all = all;
5099 net->ipv6.devconf_dflt = dflt;
5101 #ifdef CONFIG_SYSCTL
5102 err = __addrconf_sysctl_register(net, "all", NULL, all);
5106 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
5112 #ifdef CONFIG_SYSCTL
5114 __addrconf_sysctl_unregister(all);
5124 static void __net_exit addrconf_exit_net(struct net *net)
5126 #ifdef CONFIG_SYSCTL
5127 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5128 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5130 if (!net_eq(net, &init_net)) {
5131 kfree(net->ipv6.devconf_dflt);
5132 kfree(net->ipv6.devconf_all);
5136 static struct pernet_operations addrconf_ops = {
5137 .init = addrconf_init_net,
5138 .exit = addrconf_exit_net,
5141 static struct rtnl_af_ops inet6_ops = {
5143 .fill_link_af = inet6_fill_link_af,
5144 .get_link_af_size = inet6_get_link_af_size,
5145 .set_link_af = inet6_set_link_af,
5149 * Init / cleanup code
5152 int __init addrconf_init(void)
5156 err = ipv6_addr_label_init();
5158 pr_crit("%s: cannot initialize default policy table: %d\n",
5163 err = register_pernet_subsys(&addrconf_ops);
5167 /* The addrconf netdev notifier requires that loopback_dev
5168 * has it's ipv6 private information allocated and setup
5169 * before it can bring up and give link-local addresses
5170 * to other devices which are up.
5172 * Unfortunately, loopback_dev is not necessarily the first
5173 * entry in the global dev_base list of net devices. In fact,
5174 * it is likely to be the very last entry on that list.
5175 * So this causes the notifier registry below to try and
5176 * give link-local addresses to all devices besides loopback_dev
5177 * first, then loopback_dev, which cases all the non-loopback_dev
5178 * devices to fail to get a link-local address.
5180 * So, as a temporary fix, allocate the ipv6 structure for
5181 * loopback_dev first by hand.
5182 * Longer term, all of the dependencies ipv6 has upon the loopback
5183 * device and it being up should be removed.
5186 if (!ipv6_add_dev(init_net.loopback_dev))
5192 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5193 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5195 register_netdevice_notifier(&ipv6_dev_notf);
5199 err = rtnl_af_register(&inet6_ops);
5203 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5208 /* Only the first call to __rtnl_register can fail */
5209 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5210 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5211 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5212 inet6_dump_ifaddr, NULL);
5213 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5214 inet6_dump_ifmcaddr, NULL);
5215 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5216 inet6_dump_ifacaddr, NULL);
5217 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
5218 inet6_netconf_dump_devconf, NULL);
5220 ipv6_addr_label_rtnl_register();
5224 rtnl_af_unregister(&inet6_ops);
5226 unregister_netdevice_notifier(&ipv6_dev_notf);
5228 unregister_pernet_subsys(&addrconf_ops);
5230 ipv6_addr_label_cleanup();
5235 void addrconf_cleanup(void)
5237 struct net_device *dev;
5240 unregister_netdevice_notifier(&ipv6_dev_notf);
5241 unregister_pernet_subsys(&addrconf_ops);
5242 ipv6_addr_label_cleanup();
5246 __rtnl_af_unregister(&inet6_ops);
5248 /* clean dev list */
5249 for_each_netdev(&init_net, dev) {
5250 if (__in6_dev_get(dev) == NULL)
5252 addrconf_ifdown(dev, 1);
5254 addrconf_ifdown(init_net.loopback_dev, 2);
5259 spin_lock_bh(&addrconf_hash_lock);
5260 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5261 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5262 spin_unlock_bh(&addrconf_hash_lock);
5264 del_timer(&addr_chk_timer);