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>
74 #include <net/protocol.h>
75 #include <net/ndisc.h>
76 #include <net/ip6_route.h>
77 #include <net/addrconf.h>
80 #include <net/netlink.h>
81 #include <net/pkt_sched.h>
82 #include <linux/if_tunnel.h>
83 #include <linux/rtnetlink.h>
84 #include <linux/netconf.h>
86 #ifdef CONFIG_IPV6_PRIVACY
87 #include <linux/random.h>
90 #include <linux/uaccess.h>
91 #include <asm/unaligned.h>
93 #include <linux/proc_fs.h>
94 #include <linux/seq_file.h>
95 #include <linux/export.h>
97 /* Set to 3 to get tracing... */
101 #define ADBG(x) printk x
106 #define INFINITY_LIFE_TIME 0xFFFFFFFF
108 static inline u32 cstamp_delta(unsigned long cstamp)
110 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
113 #define ADDRCONF_TIMER_FUZZ_MINUS (HZ > 50 ? HZ/50 : 1)
114 #define ADDRCONF_TIMER_FUZZ (HZ / 4)
115 #define ADDRCONF_TIMER_FUZZ_MAX (HZ)
118 static void addrconf_sysctl_register(struct inet6_dev *idev);
119 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
121 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
125 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
130 #ifdef CONFIG_IPV6_PRIVACY
131 static void __ipv6_regen_rndid(struct inet6_dev *idev);
132 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
133 static void ipv6_regen_rndid(unsigned long data);
136 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
137 static int ipv6_count_addresses(struct inet6_dev *idev);
140 * Configured unicast address hash table
142 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
143 static DEFINE_SPINLOCK(addrconf_hash_lock);
145 static void addrconf_verify(unsigned long);
147 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
148 static DEFINE_SPINLOCK(addrconf_verify_lock);
150 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
151 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
153 static void addrconf_type_change(struct net_device *dev,
154 unsigned long event);
155 static int addrconf_ifdown(struct net_device *dev, int how);
157 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
158 static void addrconf_dad_timer(unsigned long data);
159 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
160 static void addrconf_dad_run(struct inet6_dev *idev);
161 static void addrconf_rs_timer(unsigned long data);
162 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
163 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
165 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
166 struct prefix_info *pinfo);
167 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
168 struct net_device *dev);
170 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
172 static struct ipv6_devconf ipv6_devconf __read_mostly = {
174 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
175 .mtu6 = IPV6_MIN_MTU,
177 .accept_redirects = 1,
179 .force_mld_version = 0,
181 .rtr_solicits = MAX_RTR_SOLICITATIONS,
182 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
183 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
184 #ifdef CONFIG_IPV6_PRIVACY
186 .temp_valid_lft = TEMP_VALID_LIFETIME,
187 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
188 .regen_max_retry = REGEN_MAX_RETRY,
189 .max_desync_factor = MAX_DESYNC_FACTOR,
191 .max_addresses = IPV6_MAX_ADDRESSES,
192 .accept_ra_defrtr = 1,
193 .accept_ra_pinfo = 1,
194 #ifdef CONFIG_IPV6_ROUTER_PREF
195 .accept_ra_rtr_pref = 1,
196 .rtr_probe_interval = 60 * HZ,
197 #ifdef CONFIG_IPV6_ROUTE_INFO
198 .accept_ra_rt_info_max_plen = 0,
202 .accept_source_route = 0, /* we do not accept RH0 by default. */
207 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
209 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
210 .mtu6 = IPV6_MIN_MTU,
212 .accept_redirects = 1,
215 .rtr_solicits = MAX_RTR_SOLICITATIONS,
216 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
217 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
218 #ifdef CONFIG_IPV6_PRIVACY
220 .temp_valid_lft = TEMP_VALID_LIFETIME,
221 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
222 .regen_max_retry = REGEN_MAX_RETRY,
223 .max_desync_factor = MAX_DESYNC_FACTOR,
225 .max_addresses = IPV6_MAX_ADDRESSES,
226 .accept_ra_defrtr = 1,
227 .accept_ra_pinfo = 1,
228 #ifdef CONFIG_IPV6_ROUTER_PREF
229 .accept_ra_rtr_pref = 1,
230 .rtr_probe_interval = 60 * HZ,
231 #ifdef CONFIG_IPV6_ROUTE_INFO
232 .accept_ra_rt_info_max_plen = 0,
236 .accept_source_route = 0, /* we do not accept RH0 by default. */
241 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
242 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
243 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
244 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
245 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
247 /* Check if a valid qdisc is available */
248 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
250 return !qdisc_tx_is_noop(dev);
253 /* Check if a route is valid prefix route */
254 static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
256 return (rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0;
259 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
261 if (del_timer(&ifp->timer))
265 enum addrconf_timer_t {
271 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
272 enum addrconf_timer_t what,
275 if (!del_timer(&ifp->timer))
280 ifp->timer.function = addrconf_dad_timer;
283 ifp->timer.function = addrconf_rs_timer;
288 ifp->timer.expires = jiffies + when;
289 add_timer(&ifp->timer);
292 static int snmp6_alloc_dev(struct inet6_dev *idev)
294 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
295 sizeof(struct ipstats_mib),
296 __alignof__(struct ipstats_mib)) < 0)
298 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
300 if (!idev->stats.icmpv6dev)
302 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
304 if (!idev->stats.icmpv6msgdev)
310 kfree(idev->stats.icmpv6dev);
312 snmp_mib_free((void __percpu **)idev->stats.ipv6);
317 static void snmp6_free_dev(struct inet6_dev *idev)
319 kfree(idev->stats.icmpv6msgdev);
320 kfree(idev->stats.icmpv6dev);
321 snmp_mib_free((void __percpu **)idev->stats.ipv6);
324 /* Nobody refers to this device, we may destroy it. */
326 void in6_dev_finish_destroy(struct inet6_dev *idev)
328 struct net_device *dev = idev->dev;
330 WARN_ON(!list_empty(&idev->addr_list));
331 WARN_ON(idev->mc_list != NULL);
333 #ifdef NET_REFCNT_DEBUG
334 pr_debug("%s: %s\n", __func__, dev ? dev->name : "NIL");
338 pr_warn("Freeing alive inet6 device %p\n", idev);
341 snmp6_free_dev(idev);
342 kfree_rcu(idev, rcu);
344 EXPORT_SYMBOL(in6_dev_finish_destroy);
346 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
348 struct inet6_dev *ndev;
352 if (dev->mtu < IPV6_MIN_MTU)
355 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
360 rwlock_init(&ndev->lock);
362 INIT_LIST_HEAD(&ndev->addr_list);
364 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
365 ndev->cnf.mtu6 = dev->mtu;
366 ndev->cnf.sysctl = NULL;
367 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
368 if (ndev->nd_parms == NULL) {
372 if (ndev->cnf.forwarding)
373 dev_disable_lro(dev);
374 /* We refer to the device */
377 if (snmp6_alloc_dev(ndev) < 0) {
379 "%s: cannot allocate memory for statistics; dev=%s.\n",
380 __func__, dev->name));
381 neigh_parms_release(&nd_tbl, ndev->nd_parms);
387 if (snmp6_register_dev(ndev) < 0) {
389 "%s: cannot create /proc/net/dev_snmp6/%s\n",
390 __func__, dev->name));
391 neigh_parms_release(&nd_tbl, ndev->nd_parms);
393 in6_dev_finish_destroy(ndev);
397 /* One reference from device. We must do this before
398 * we invoke __ipv6_regen_rndid().
402 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
403 ndev->cnf.accept_dad = -1;
405 #if IS_ENABLED(CONFIG_IPV6_SIT)
406 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
407 pr_info("%s: Disabled Multicast RS\n", dev->name);
408 ndev->cnf.rtr_solicits = 0;
412 #ifdef CONFIG_IPV6_PRIVACY
413 INIT_LIST_HEAD(&ndev->tempaddr_list);
414 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
415 if ((dev->flags&IFF_LOOPBACK) ||
416 dev->type == ARPHRD_TUNNEL ||
417 dev->type == ARPHRD_TUNNEL6 ||
418 dev->type == ARPHRD_SIT ||
419 dev->type == ARPHRD_NONE) {
420 ndev->cnf.use_tempaddr = -1;
423 ipv6_regen_rndid((unsigned long) ndev);
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 all-node multicast group */
437 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
439 /* Join all-router multicast group if forwarding is set */
440 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
441 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
446 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
448 struct inet6_dev *idev;
452 idev = __in6_dev_get(dev);
454 idev = ipv6_add_dev(dev);
459 if (dev->flags&IFF_UP)
464 static int inet6_netconf_msgsize_devconf(int type)
466 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
467 + nla_total_size(4); /* NETCONFA_IFINDEX */
469 /* type -1 is used for ALL */
470 if (type == -1 || type == NETCONFA_FORWARDING)
471 size += nla_total_size(4);
472 #ifdef CONFIG_IPV6_MROUTE
473 if (type == -1 || type == NETCONFA_MC_FORWARDING)
474 size += nla_total_size(4);
480 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
481 struct ipv6_devconf *devconf, u32 portid,
482 u32 seq, int event, unsigned int flags,
485 struct nlmsghdr *nlh;
486 struct netconfmsg *ncm;
488 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
493 ncm = nlmsg_data(nlh);
494 ncm->ncm_family = AF_INET6;
496 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
497 goto nla_put_failure;
499 /* type -1 is used for ALL */
500 if ((type == -1 || type == NETCONFA_FORWARDING) &&
501 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
502 goto nla_put_failure;
503 #ifdef CONFIG_IPV6_MROUTE
504 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
505 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
506 devconf->mc_forwarding) < 0)
507 goto nla_put_failure;
509 return nlmsg_end(skb, nlh);
512 nlmsg_cancel(skb, nlh);
516 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
517 struct ipv6_devconf *devconf)
522 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
526 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
527 RTM_NEWNETCONF, 0, type);
529 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
530 WARN_ON(err == -EMSGSIZE);
534 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
537 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
540 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
541 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
542 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
545 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
546 struct nlmsghdr *nlh,
549 struct net *net = sock_net(in_skb->sk);
550 struct nlattr *tb[NETCONFA_MAX+1];
551 struct netconfmsg *ncm;
553 struct ipv6_devconf *devconf;
554 struct inet6_dev *in6_dev;
555 struct net_device *dev;
559 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
560 devconf_ipv6_policy);
565 if (!tb[NETCONFA_IFINDEX])
568 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
570 case NETCONFA_IFINDEX_ALL:
571 devconf = net->ipv6.devconf_all;
573 case NETCONFA_IFINDEX_DEFAULT:
574 devconf = net->ipv6.devconf_dflt;
577 dev = __dev_get_by_index(net, ifindex);
580 in6_dev = __in6_dev_get(dev);
583 devconf = &in6_dev->cnf;
588 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
592 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
593 NETLINK_CB(in_skb).portid,
594 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
597 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
598 WARN_ON(err == -EMSGSIZE);
602 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
608 static void dev_forward_change(struct inet6_dev *idev)
610 struct net_device *dev;
611 struct inet6_ifaddr *ifa;
616 if (idev->cnf.forwarding)
617 dev_disable_lro(dev);
618 if (dev->flags & IFF_MULTICAST) {
619 if (idev->cnf.forwarding)
620 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
622 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
625 list_for_each_entry(ifa, &idev->addr_list, if_list) {
626 if (ifa->flags&IFA_F_TENTATIVE)
628 if (idev->cnf.forwarding)
629 addrconf_join_anycast(ifa);
631 addrconf_leave_anycast(ifa);
633 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
634 dev->ifindex, &idev->cnf);
638 static void addrconf_forward_change(struct net *net, __s32 newf)
640 struct net_device *dev;
641 struct inet6_dev *idev;
643 for_each_netdev(net, dev) {
644 idev = __in6_dev_get(dev);
646 int changed = (!idev->cnf.forwarding) ^ (!newf);
647 idev->cnf.forwarding = newf;
649 dev_forward_change(idev);
654 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
660 return restart_syscall();
662 net = (struct net *)table->extra2;
666 if (p == &net->ipv6.devconf_dflt->forwarding) {
667 if ((!newf) ^ (!old))
668 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
669 NETCONFA_IFINDEX_DEFAULT,
670 net->ipv6.devconf_dflt);
675 if (p == &net->ipv6.devconf_all->forwarding) {
676 net->ipv6.devconf_dflt->forwarding = newf;
677 addrconf_forward_change(net, newf);
678 if ((!newf) ^ (!old))
679 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
680 NETCONFA_IFINDEX_ALL,
681 net->ipv6.devconf_all);
682 } else if ((!newf) ^ (!old))
683 dev_forward_change((struct inet6_dev *)table->extra1);
687 rt6_purge_dflt_routers(net);
692 /* Nobody refers to this ifaddr, destroy it */
693 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
695 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
697 #ifdef NET_REFCNT_DEBUG
698 pr_debug("%s\n", __func__);
701 in6_dev_put(ifp->idev);
703 if (del_timer(&ifp->timer))
704 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
706 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
707 pr_warn("Freeing alive inet6 address %p\n", ifp);
716 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
719 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
722 * Each device address list is sorted in order of scope -
723 * global before linklocal.
725 list_for_each(p, &idev->addr_list) {
726 struct inet6_ifaddr *ifa
727 = list_entry(p, struct inet6_ifaddr, if_list);
728 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
732 list_add_tail(&ifp->if_list, p);
735 static u32 inet6_addr_hash(const struct in6_addr *addr)
737 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
740 /* On success it returns ifp with increased reference count */
742 static struct inet6_ifaddr *
743 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
744 int scope, u32 flags)
746 struct inet6_ifaddr *ifa = NULL;
750 int addr_type = ipv6_addr_type(addr);
752 if (addr_type == IPV6_ADDR_ANY ||
753 addr_type & IPV6_ADDR_MULTICAST ||
754 (!(idev->dev->flags & IFF_LOOPBACK) &&
755 addr_type & IPV6_ADDR_LOOPBACK))
756 return ERR_PTR(-EADDRNOTAVAIL);
760 err = -ENODEV; /*XXX*/
764 if (idev->cnf.disable_ipv6) {
769 spin_lock(&addrconf_hash_lock);
771 /* Ignore adding duplicate addresses on an interface */
772 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
773 ADBG(("ipv6_add_addr: already assigned\n"));
778 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
781 ADBG(("ipv6_add_addr: malloc failed\n"));
786 rt = addrconf_dst_alloc(idev, addr, false);
794 spin_lock_init(&ifa->lock);
795 spin_lock_init(&ifa->state_lock);
796 init_timer(&ifa->timer);
797 INIT_HLIST_NODE(&ifa->addr_lst);
798 ifa->timer.data = (unsigned long) ifa;
800 ifa->prefix_len = pfxlen;
801 ifa->flags = flags | IFA_F_TENTATIVE;
802 ifa->cstamp = ifa->tstamp = jiffies;
811 /* Add to big hash table */
812 hash = inet6_addr_hash(addr);
814 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
815 spin_unlock(&addrconf_hash_lock);
817 write_lock(&idev->lock);
818 /* Add to inet6_dev unicast addr list. */
819 ipv6_link_dev_addr(idev, ifa);
821 #ifdef CONFIG_IPV6_PRIVACY
822 if (ifa->flags&IFA_F_TEMPORARY) {
823 list_add(&ifa->tmp_list, &idev->tempaddr_list);
829 write_unlock(&idev->lock);
831 rcu_read_unlock_bh();
833 if (likely(err == 0))
834 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
842 spin_unlock(&addrconf_hash_lock);
846 /* This function wants to get referenced ifp and releases it before return */
848 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
850 struct inet6_ifaddr *ifa, *ifn;
851 struct inet6_dev *idev = ifp->idev;
853 int deleted = 0, onlink = 0;
854 unsigned long expires = jiffies;
856 spin_lock_bh(&ifp->state_lock);
858 ifp->state = INET6_IFADDR_STATE_DEAD;
859 spin_unlock_bh(&ifp->state_lock);
861 if (state == INET6_IFADDR_STATE_DEAD)
864 spin_lock_bh(&addrconf_hash_lock);
865 hlist_del_init_rcu(&ifp->addr_lst);
866 spin_unlock_bh(&addrconf_hash_lock);
868 write_lock_bh(&idev->lock);
869 #ifdef CONFIG_IPV6_PRIVACY
870 if (ifp->flags&IFA_F_TEMPORARY) {
871 list_del(&ifp->tmp_list);
873 in6_ifa_put(ifp->ifpub);
880 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
882 list_del_init(&ifp->if_list);
885 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
889 } else if (ifp->flags & IFA_F_PERMANENT) {
890 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
892 if (ifa->flags & IFA_F_PERMANENT) {
897 unsigned long lifetime;
902 spin_lock(&ifa->lock);
904 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
906 * Note: Because this address is
907 * not permanent, lifetime <
908 * LONG_MAX / HZ here.
910 if (time_before(expires,
911 ifa->tstamp + lifetime * HZ))
912 expires = ifa->tstamp + lifetime * HZ;
913 spin_unlock(&ifa->lock);
918 write_unlock_bh(&idev->lock);
920 addrconf_del_timer(ifp);
922 ipv6_ifa_notify(RTM_DELADDR, ifp);
924 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
927 * Purge or update corresponding prefix
929 * 1) we don't purge prefix here if address was not permanent.
930 * prefix is managed by its own lifetime.
931 * 2) if there're no addresses, delete prefix.
932 * 3) if there're still other permanent address(es),
933 * corresponding prefix is still permanent.
934 * 4) otherwise, update prefix lifetime to the
935 * longest valid lifetime among the corresponding
936 * addresses on the device.
937 * Note: subsequent RA will update lifetime.
941 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
942 struct in6_addr prefix;
944 struct net *net = dev_net(ifp->idev->dev);
945 struct flowi6 fl6 = {};
947 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
948 fl6.flowi6_oif = ifp->idev->dev->ifindex;
950 rt = (struct rt6_info *)ip6_route_lookup(net, &fl6,
953 if (rt != net->ipv6.ip6_null_entry &&
954 addrconf_is_prefix_route(rt)) {
958 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
959 rt6_set_expires(rt, expires);
965 /* clean up prefsrc entries */
966 rt6_remove_prefsrc(ifp);
971 #ifdef CONFIG_IPV6_PRIVACY
972 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
974 struct inet6_dev *idev = ifp->idev;
975 struct in6_addr addr, *tmpaddr;
976 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
977 unsigned long regen_advance;
982 unsigned long now = jiffies;
984 write_lock(&idev->lock);
986 spin_lock_bh(&ift->lock);
987 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
988 spin_unlock_bh(&ift->lock);
995 if (idev->cnf.use_tempaddr <= 0) {
996 write_unlock(&idev->lock);
997 pr_info("%s: use_tempaddr is disabled\n", __func__);
1002 spin_lock_bh(&ifp->lock);
1003 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1004 idev->cnf.use_tempaddr = -1; /*XXX*/
1005 spin_unlock_bh(&ifp->lock);
1006 write_unlock(&idev->lock);
1007 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1014 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1015 __ipv6_try_regen_rndid(idev, tmpaddr);
1016 memcpy(&addr.s6_addr[8], idev->rndid, 8);
1017 age = (now - ifp->tstamp) / HZ;
1018 tmp_valid_lft = min_t(__u32,
1020 idev->cnf.temp_valid_lft + age);
1021 tmp_prefered_lft = min_t(__u32,
1023 idev->cnf.temp_prefered_lft + age -
1024 idev->cnf.max_desync_factor);
1025 tmp_plen = ifp->prefix_len;
1026 max_addresses = idev->cnf.max_addresses;
1027 tmp_tstamp = ifp->tstamp;
1028 spin_unlock_bh(&ifp->lock);
1030 regen_advance = idev->cnf.regen_max_retry *
1031 idev->cnf.dad_transmits *
1032 idev->nd_parms->retrans_time / HZ;
1033 write_unlock(&idev->lock);
1035 /* A temporary address is created only if this calculated Preferred
1036 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1037 * an implementation must not create a temporary address with a zero
1038 * Preferred Lifetime.
1040 if (tmp_prefered_lft <= regen_advance) {
1047 addr_flags = IFA_F_TEMPORARY;
1048 /* set in addrconf_prefix_rcv() */
1049 if (ifp->flags & IFA_F_OPTIMISTIC)
1050 addr_flags |= IFA_F_OPTIMISTIC;
1052 ift = !max_addresses ||
1053 ipv6_count_addresses(idev) < max_addresses ?
1054 ipv6_add_addr(idev, &addr, tmp_plen,
1055 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
1057 if (!ift || IS_ERR(ift)) {
1060 pr_info("%s: retry temporary address regeneration\n", __func__);
1062 write_lock(&idev->lock);
1066 spin_lock_bh(&ift->lock);
1068 ift->valid_lft = tmp_valid_lft;
1069 ift->prefered_lft = tmp_prefered_lft;
1071 ift->tstamp = tmp_tstamp;
1072 spin_unlock_bh(&ift->lock);
1074 addrconf_dad_start(ift);
1083 * Choose an appropriate source address (RFC3484)
1086 IPV6_SADDR_RULE_INIT = 0,
1087 IPV6_SADDR_RULE_LOCAL,
1088 IPV6_SADDR_RULE_SCOPE,
1089 IPV6_SADDR_RULE_PREFERRED,
1090 #ifdef CONFIG_IPV6_MIP6
1091 IPV6_SADDR_RULE_HOA,
1093 IPV6_SADDR_RULE_OIF,
1094 IPV6_SADDR_RULE_LABEL,
1095 #ifdef CONFIG_IPV6_PRIVACY
1096 IPV6_SADDR_RULE_PRIVACY,
1098 IPV6_SADDR_RULE_ORCHID,
1099 IPV6_SADDR_RULE_PREFIX,
1103 struct ipv6_saddr_score {
1106 struct inet6_ifaddr *ifa;
1107 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1112 struct ipv6_saddr_dst {
1113 const struct in6_addr *addr;
1120 static inline int ipv6_saddr_preferred(int type)
1122 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1127 static int ipv6_get_saddr_eval(struct net *net,
1128 struct ipv6_saddr_score *score,
1129 struct ipv6_saddr_dst *dst,
1134 if (i <= score->rule) {
1136 case IPV6_SADDR_RULE_SCOPE:
1137 ret = score->scopedist;
1139 case IPV6_SADDR_RULE_PREFIX:
1140 ret = score->matchlen;
1143 ret = !!test_bit(i, score->scorebits);
1149 case IPV6_SADDR_RULE_INIT:
1150 /* Rule 0: remember if hiscore is not ready yet */
1153 case IPV6_SADDR_RULE_LOCAL:
1154 /* Rule 1: Prefer same address */
1155 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1157 case IPV6_SADDR_RULE_SCOPE:
1158 /* Rule 2: Prefer appropriate scope
1163 * ---+--+-+---> scope
1165 * | d is scope of the destination.
1167 * | \ <- smaller scope is better if
1168 * B-15 | \ if scope is enough for destinaion.
1169 * | ret = B - scope (-1 <= scope >= d <= 15).
1171 * |/ <- greater is better
1172 * -C / if scope is not enough for destination.
1173 * /| ret = scope - C (-1 <= d < scope <= 15).
1175 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1176 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1177 * Assume B = 0 and we get C > 29.
1179 ret = __ipv6_addr_src_scope(score->addr_type);
1180 if (ret >= dst->scope)
1183 ret -= 128; /* 30 is enough */
1184 score->scopedist = ret;
1186 case IPV6_SADDR_RULE_PREFERRED:
1187 /* Rule 3: Avoid deprecated and optimistic addresses */
1188 ret = ipv6_saddr_preferred(score->addr_type) ||
1189 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1191 #ifdef CONFIG_IPV6_MIP6
1192 case IPV6_SADDR_RULE_HOA:
1194 /* Rule 4: Prefer home address */
1195 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1196 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1200 case IPV6_SADDR_RULE_OIF:
1201 /* Rule 5: Prefer outgoing interface */
1202 ret = (!dst->ifindex ||
1203 dst->ifindex == score->ifa->idev->dev->ifindex);
1205 case IPV6_SADDR_RULE_LABEL:
1206 /* Rule 6: Prefer matching label */
1207 ret = ipv6_addr_label(net,
1208 &score->ifa->addr, score->addr_type,
1209 score->ifa->idev->dev->ifindex) == dst->label;
1211 #ifdef CONFIG_IPV6_PRIVACY
1212 case IPV6_SADDR_RULE_PRIVACY:
1214 /* Rule 7: Prefer public address
1215 * Note: prefer temporary address if use_tempaddr >= 2
1217 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1218 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1219 score->ifa->idev->cnf.use_tempaddr >= 2;
1220 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1224 case IPV6_SADDR_RULE_ORCHID:
1225 /* Rule 8-: Prefer ORCHID vs ORCHID or
1226 * non-ORCHID vs non-ORCHID
1228 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1229 ipv6_addr_orchid(dst->addr));
1231 case IPV6_SADDR_RULE_PREFIX:
1232 /* Rule 8: Use longest matching prefix */
1233 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1234 if (ret > score->ifa->prefix_len)
1235 ret = score->ifa->prefix_len;
1236 score->matchlen = ret;
1243 __set_bit(i, score->scorebits);
1249 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1250 const struct in6_addr *daddr, unsigned int prefs,
1251 struct in6_addr *saddr)
1253 struct ipv6_saddr_score scores[2],
1254 *score = &scores[0], *hiscore = &scores[1];
1255 struct ipv6_saddr_dst dst;
1256 struct net_device *dev;
1259 dst_type = __ipv6_addr_type(daddr);
1261 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1262 dst.scope = __ipv6_addr_src_scope(dst_type);
1263 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1267 hiscore->ifa = NULL;
1271 for_each_netdev_rcu(net, dev) {
1272 struct inet6_dev *idev;
1274 /* Candidate Source Address (section 4)
1275 * - multicast and link-local destination address,
1276 * the set of candidate source address MUST only
1277 * include addresses assigned to interfaces
1278 * belonging to the same link as the outgoing
1280 * (- For site-local destination addresses, the
1281 * set of candidate source addresses MUST only
1282 * include addresses assigned to interfaces
1283 * belonging to the same site as the outgoing
1286 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1287 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1288 dst.ifindex && dev->ifindex != dst.ifindex)
1291 idev = __in6_dev_get(dev);
1295 read_lock_bh(&idev->lock);
1296 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1300 * - Tentative Address (RFC2462 section 5.4)
1301 * - A tentative address is not considered
1302 * "assigned to an interface" in the traditional
1303 * sense, unless it is also flagged as optimistic.
1304 * - Candidate Source Address (section 4)
1305 * - In any case, anycast addresses, multicast
1306 * addresses, and the unspecified address MUST
1307 * NOT be included in a candidate set.
1309 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1310 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1313 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1315 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1316 score->addr_type & IPV6_ADDR_MULTICAST)) {
1317 LIMIT_NETDEBUG(KERN_DEBUG
1318 "ADDRCONF: unspecified / multicast address "
1319 "assigned as unicast address on %s",
1325 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1327 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1328 int minihiscore, miniscore;
1330 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1331 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1333 if (minihiscore > miniscore) {
1334 if (i == IPV6_SADDR_RULE_SCOPE &&
1335 score->scopedist > 0) {
1338 * each remaining entry
1339 * has too small (not enough)
1340 * scope, because ifa entries
1341 * are sorted by their scope
1347 } else if (minihiscore < miniscore) {
1349 in6_ifa_put(hiscore->ifa);
1351 in6_ifa_hold(score->ifa);
1353 swap(hiscore, score);
1355 /* restore our iterator */
1356 score->ifa = hiscore->ifa;
1363 read_unlock_bh(&idev->lock);
1368 return -EADDRNOTAVAIL;
1370 *saddr = hiscore->ifa->addr;
1371 in6_ifa_put(hiscore->ifa);
1374 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1376 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1377 unsigned char banned_flags)
1379 struct inet6_dev *idev;
1380 int err = -EADDRNOTAVAIL;
1383 idev = __in6_dev_get(dev);
1385 struct inet6_ifaddr *ifp;
1387 read_lock_bh(&idev->lock);
1388 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1389 if (ifp->scope == IFA_LINK &&
1390 !(ifp->flags & banned_flags)) {
1396 read_unlock_bh(&idev->lock);
1402 static int ipv6_count_addresses(struct inet6_dev *idev)
1405 struct inet6_ifaddr *ifp;
1407 read_lock_bh(&idev->lock);
1408 list_for_each_entry(ifp, &idev->addr_list, if_list)
1410 read_unlock_bh(&idev->lock);
1414 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1415 struct net_device *dev, int strict)
1417 struct inet6_ifaddr *ifp;
1418 struct hlist_node *node;
1419 unsigned int hash = inet6_addr_hash(addr);
1422 hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1423 if (!net_eq(dev_net(ifp->idev->dev), net))
1425 if (ipv6_addr_equal(&ifp->addr, addr) &&
1426 !(ifp->flags&IFA_F_TENTATIVE) &&
1427 (dev == NULL || ifp->idev->dev == dev ||
1428 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1429 rcu_read_unlock_bh();
1434 rcu_read_unlock_bh();
1437 EXPORT_SYMBOL(ipv6_chk_addr);
1439 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1440 struct net_device *dev)
1442 unsigned int hash = inet6_addr_hash(addr);
1443 struct inet6_ifaddr *ifp;
1444 struct hlist_node *node;
1446 hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1447 if (!net_eq(dev_net(ifp->idev->dev), net))
1449 if (ipv6_addr_equal(&ifp->addr, addr)) {
1450 if (dev == NULL || ifp->idev->dev == dev)
1457 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1459 struct inet6_dev *idev;
1460 struct inet6_ifaddr *ifa;
1465 idev = __in6_dev_get(dev);
1467 read_lock_bh(&idev->lock);
1468 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1469 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1474 read_unlock_bh(&idev->lock);
1479 EXPORT_SYMBOL(ipv6_chk_prefix);
1481 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1482 struct net_device *dev, int strict)
1484 struct inet6_ifaddr *ifp, *result = NULL;
1485 unsigned int hash = inet6_addr_hash(addr);
1486 struct hlist_node *node;
1489 hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1490 if (!net_eq(dev_net(ifp->idev->dev), net))
1492 if (ipv6_addr_equal(&ifp->addr, addr)) {
1493 if (dev == NULL || ifp->idev->dev == dev ||
1494 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1501 rcu_read_unlock_bh();
1506 /* Gets referenced address, destroys ifaddr */
1508 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1510 if (ifp->flags&IFA_F_PERMANENT) {
1511 spin_lock_bh(&ifp->lock);
1512 addrconf_del_timer(ifp);
1513 ifp->flags |= IFA_F_TENTATIVE;
1515 ifp->flags |= IFA_F_DADFAILED;
1516 spin_unlock_bh(&ifp->lock);
1518 ipv6_ifa_notify(0, ifp);
1520 #ifdef CONFIG_IPV6_PRIVACY
1521 } else if (ifp->flags&IFA_F_TEMPORARY) {
1522 struct inet6_ifaddr *ifpub;
1523 spin_lock_bh(&ifp->lock);
1526 in6_ifa_hold(ifpub);
1527 spin_unlock_bh(&ifp->lock);
1528 ipv6_create_tempaddr(ifpub, ifp);
1531 spin_unlock_bh(&ifp->lock);
1539 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1543 spin_lock(&ifp->state_lock);
1544 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1545 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1548 spin_unlock(&ifp->state_lock);
1553 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1555 struct inet6_dev *idev = ifp->idev;
1557 if (addrconf_dad_end(ifp)) {
1562 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1563 ifp->idev->dev->name, &ifp->addr);
1565 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1566 struct in6_addr addr;
1568 addr.s6_addr32[0] = htonl(0xfe800000);
1569 addr.s6_addr32[1] = 0;
1571 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1572 ipv6_addr_equal(&ifp->addr, &addr)) {
1573 /* DAD failed for link-local based on MAC address */
1574 idev->cnf.disable_ipv6 = 1;
1576 pr_info("%s: IPv6 being disabled!\n",
1577 ifp->idev->dev->name);
1581 addrconf_dad_stop(ifp, 1);
1584 /* Join to solicited addr multicast group. */
1586 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1588 struct in6_addr maddr;
1590 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1593 addrconf_addr_solict_mult(addr, &maddr);
1594 ipv6_dev_mc_inc(dev, &maddr);
1597 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1599 struct in6_addr maddr;
1601 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1604 addrconf_addr_solict_mult(addr, &maddr);
1605 __ipv6_dev_mc_dec(idev, &maddr);
1608 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1610 struct in6_addr addr;
1611 if (ifp->prefix_len == 127) /* RFC 6164 */
1613 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1614 if (ipv6_addr_any(&addr))
1616 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1619 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1621 struct in6_addr addr;
1622 if (ifp->prefix_len == 127) /* RFC 6164 */
1624 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1625 if (ipv6_addr_any(&addr))
1627 __ipv6_dev_ac_dec(ifp->idev, &addr);
1630 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1632 if (dev->addr_len != ETH_ALEN)
1634 memcpy(eui, dev->dev_addr, 3);
1635 memcpy(eui + 5, dev->dev_addr + 3, 3);
1638 * The zSeries OSA network cards can be shared among various
1639 * OS instances, but the OSA cards have only one MAC address.
1640 * This leads to duplicate address conflicts in conjunction
1641 * with IPv6 if more than one instance uses the same card.
1643 * The driver for these cards can deliver a unique 16-bit
1644 * identifier for each instance sharing the same card. It is
1645 * placed instead of 0xFFFE in the interface identifier. The
1646 * "u" bit of the interface identifier is not inverted in this
1647 * case. Hence the resulting interface identifier has local
1648 * scope according to RFC2373.
1651 eui[3] = (dev->dev_id >> 8) & 0xFF;
1652 eui[4] = dev->dev_id & 0xFF;
1661 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1663 if (dev->addr_len != IEEE802154_ADDR_LEN)
1665 memcpy(eui, dev->dev_addr, 8);
1669 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1671 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1672 if (dev->addr_len != ARCNET_ALEN)
1675 eui[7] = *(u8 *)dev->dev_addr;
1679 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1681 if (dev->addr_len != INFINIBAND_ALEN)
1683 memcpy(eui, dev->dev_addr + 12, 8);
1688 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1692 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1693 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1694 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1695 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1696 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1697 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1701 memcpy(eui + 4, &addr, 4);
1705 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1707 if (dev->priv_flags & IFF_ISATAP)
1708 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1712 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1714 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1717 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1719 switch (dev->type) {
1722 return addrconf_ifid_eui48(eui, dev);
1724 return addrconf_ifid_arcnet(eui, dev);
1725 case ARPHRD_INFINIBAND:
1726 return addrconf_ifid_infiniband(eui, dev);
1728 return addrconf_ifid_sit(eui, dev);
1730 return addrconf_ifid_gre(eui, dev);
1731 case ARPHRD_IEEE802154:
1732 return addrconf_ifid_eui64(eui, dev);
1737 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1740 struct inet6_ifaddr *ifp;
1742 read_lock_bh(&idev->lock);
1743 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1744 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1745 memcpy(eui, ifp->addr.s6_addr+8, 8);
1750 read_unlock_bh(&idev->lock);
1754 #ifdef CONFIG_IPV6_PRIVACY
1755 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1756 static void __ipv6_regen_rndid(struct inet6_dev *idev)
1759 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1760 idev->rndid[0] &= ~0x02;
1763 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1764 * check if generated address is not inappropriate
1766 * - Reserved subnet anycast (RFC 2526)
1767 * 11111101 11....11 1xxxxxxx
1768 * - ISATAP (RFC4214) 6.1
1769 * 00-00-5E-FE-xx-xx-xx-xx
1771 * - XXX: already assigned to an address on the device
1773 if (idev->rndid[0] == 0xfd &&
1774 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1775 (idev->rndid[7]&0x80))
1777 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1778 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1780 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1785 static void ipv6_regen_rndid(unsigned long data)
1787 struct inet6_dev *idev = (struct inet6_dev *) data;
1788 unsigned long expires;
1791 write_lock_bh(&idev->lock);
1796 __ipv6_regen_rndid(idev);
1799 idev->cnf.temp_prefered_lft * HZ -
1800 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1801 idev->cnf.max_desync_factor * HZ;
1802 if (time_before(expires, jiffies)) {
1803 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
1804 __func__, idev->dev->name);
1808 if (!mod_timer(&idev->regen_timer, expires))
1812 write_unlock_bh(&idev->lock);
1813 rcu_read_unlock_bh();
1817 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
1819 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1820 __ipv6_regen_rndid(idev);
1829 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1830 unsigned long expires, u32 flags)
1832 struct fib6_config cfg = {
1833 .fc_table = RT6_TABLE_PREFIX,
1834 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1835 .fc_ifindex = dev->ifindex,
1836 .fc_expires = expires,
1838 .fc_flags = RTF_UP | flags,
1839 .fc_nlinfo.nl_net = dev_net(dev),
1840 .fc_protocol = RTPROT_KERNEL,
1845 /* Prevent useless cloning on PtP SIT.
1846 This thing is done here expecting that the whole
1847 class of non-broadcast devices need not cloning.
1849 #if IS_ENABLED(CONFIG_IPV6_SIT)
1850 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1851 cfg.fc_flags |= RTF_NONEXTHOP;
1854 ip6_route_add(&cfg);
1858 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
1860 const struct net_device *dev,
1861 u32 flags, u32 noflags)
1863 struct fib6_node *fn;
1864 struct rt6_info *rt = NULL;
1865 struct fib6_table *table;
1867 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
1871 read_lock_bh(&table->tb6_lock);
1872 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
1875 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1876 if (rt->dst.dev->ifindex != dev->ifindex)
1878 if ((rt->rt6i_flags & flags) != flags)
1880 if ((noflags != 0) && ((rt->rt6i_flags & flags) != 0))
1886 read_unlock_bh(&table->tb6_lock);
1891 /* Create "default" multicast route to the interface */
1893 static void addrconf_add_mroute(struct net_device *dev)
1895 struct fib6_config cfg = {
1896 .fc_table = RT6_TABLE_LOCAL,
1897 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1898 .fc_ifindex = dev->ifindex,
1901 .fc_nlinfo.nl_net = dev_net(dev),
1904 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1906 ip6_route_add(&cfg);
1909 #if IS_ENABLED(CONFIG_IPV6_SIT)
1910 static void sit_route_add(struct net_device *dev)
1912 struct fib6_config cfg = {
1913 .fc_table = RT6_TABLE_MAIN,
1914 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1915 .fc_ifindex = dev->ifindex,
1917 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1918 .fc_nlinfo.nl_net = dev_net(dev),
1921 /* prefix length - 96 bits "::d.d.d.d" */
1922 ip6_route_add(&cfg);
1926 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1928 struct inet6_dev *idev;
1932 idev = ipv6_find_idev(dev);
1934 return ERR_PTR(-ENOBUFS);
1936 if (idev->cnf.disable_ipv6)
1937 return ERR_PTR(-EACCES);
1939 /* Add default multicast route */
1940 if (!(dev->flags & IFF_LOOPBACK))
1941 addrconf_add_mroute(dev);
1946 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1948 struct prefix_info *pinfo;
1952 struct inet6_dev *in6_dev;
1953 struct net *net = dev_net(dev);
1955 pinfo = (struct prefix_info *) opt;
1957 if (len < sizeof(struct prefix_info)) {
1958 ADBG(("addrconf: prefix option too short\n"));
1963 * Validation checks ([ADDRCONF], page 19)
1966 addr_type = ipv6_addr_type(&pinfo->prefix);
1968 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1971 valid_lft = ntohl(pinfo->valid);
1972 prefered_lft = ntohl(pinfo->prefered);
1974 if (prefered_lft > valid_lft) {
1975 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1979 in6_dev = in6_dev_get(dev);
1981 if (in6_dev == NULL) {
1982 net_dbg_ratelimited("addrconf: device %s not configured\n",
1988 * Two things going on here:
1989 * 1) Add routes for on-link prefixes
1990 * 2) Configure prefixes with the auto flag set
1993 if (pinfo->onlink) {
1994 struct rt6_info *rt;
1995 unsigned long rt_expires;
1997 /* Avoid arithmetic overflow. Really, we could
1998 * save rt_expires in seconds, likely valid_lft,
1999 * but it would require division in fib gc, that it
2003 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2005 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2007 if (addrconf_finite_timeout(rt_expires))
2010 rt = addrconf_get_prefix_route(&pinfo->prefix,
2013 RTF_ADDRCONF | RTF_PREFIX_RT,
2014 RTF_GATEWAY | RTF_DEFAULT);
2017 /* Autoconf prefix route */
2018 if (valid_lft == 0) {
2021 } else if (addrconf_finite_timeout(rt_expires)) {
2023 rt6_set_expires(rt, jiffies + rt_expires);
2025 rt6_clean_expires(rt);
2027 } else if (valid_lft) {
2028 clock_t expires = 0;
2029 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2030 if (addrconf_finite_timeout(rt_expires)) {
2032 flags |= RTF_EXPIRES;
2033 expires = jiffies_to_clock_t(rt_expires);
2035 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2036 dev, expires, flags);
2041 /* Try to figure out our local address for this prefix */
2043 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2044 struct inet6_ifaddr *ifp;
2045 struct in6_addr addr;
2046 int create = 0, update_lft = 0;
2048 if (pinfo->prefix_len == 64) {
2049 memcpy(&addr, &pinfo->prefix, 8);
2050 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2051 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2052 in6_dev_put(in6_dev);
2057 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2059 in6_dev_put(in6_dev);
2064 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
2066 if (ifp == NULL && valid_lft) {
2067 int max_addresses = in6_dev->cnf.max_addresses;
2070 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2071 if (in6_dev->cnf.optimistic_dad &&
2072 !net->ipv6.devconf_all->forwarding && sllao)
2073 addr_flags = IFA_F_OPTIMISTIC;
2076 /* Do not allow to create too much of autoconfigured
2077 * addresses; this would be too easy way to crash kernel.
2079 if (!max_addresses ||
2080 ipv6_count_addresses(in6_dev) < max_addresses)
2081 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
2082 addr_type&IPV6_ADDR_SCOPE_MASK,
2085 if (!ifp || IS_ERR(ifp)) {
2086 in6_dev_put(in6_dev);
2090 update_lft = create = 1;
2091 ifp->cstamp = jiffies;
2092 addrconf_dad_start(ifp);
2098 #ifdef CONFIG_IPV6_PRIVACY
2099 struct inet6_ifaddr *ift;
2103 /* update lifetime (RFC2462 5.5.3 e) */
2104 spin_lock(&ifp->lock);
2106 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2107 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2110 if (!update_lft && stored_lft) {
2111 if (valid_lft > MIN_VALID_LIFETIME ||
2112 valid_lft > stored_lft)
2114 else if (stored_lft <= MIN_VALID_LIFETIME) {
2115 /* valid_lft <= stored_lft is always true */
2117 * RFC 4862 Section 5.5.3e:
2118 * "Note that the preferred lifetime of
2119 * the corresponding address is always
2120 * reset to the Preferred Lifetime in
2121 * the received Prefix Information
2122 * option, regardless of whether the
2123 * valid lifetime is also reset or
2126 * So if the preferred lifetime in
2127 * this advertisement is different
2128 * than what we have stored, but the
2129 * valid lifetime is invalid, just
2130 * reset prefered_lft.
2132 * We must set the valid lifetime
2133 * to the stored lifetime since we'll
2134 * be updating the timestamp below,
2135 * else we'll set it back to the
2138 if (prefered_lft != ifp->prefered_lft) {
2139 valid_lft = stored_lft;
2143 valid_lft = MIN_VALID_LIFETIME;
2144 if (valid_lft < prefered_lft)
2145 prefered_lft = valid_lft;
2151 ifp->valid_lft = valid_lft;
2152 ifp->prefered_lft = prefered_lft;
2155 ifp->flags &= ~IFA_F_DEPRECATED;
2156 spin_unlock(&ifp->lock);
2158 if (!(flags&IFA_F_TENTATIVE))
2159 ipv6_ifa_notify(0, ifp);
2161 spin_unlock(&ifp->lock);
2163 #ifdef CONFIG_IPV6_PRIVACY
2164 read_lock_bh(&in6_dev->lock);
2165 /* update all temporary addresses in the list */
2166 list_for_each_entry(ift, &in6_dev->tempaddr_list,
2168 int age, max_valid, max_prefered;
2170 if (ifp != ift->ifpub)
2174 * RFC 4941 section 3.3:
2175 * If a received option will extend the lifetime
2176 * of a public address, the lifetimes of
2177 * temporary addresses should be extended,
2178 * subject to the overall constraint that no
2179 * temporary addresses should ever remain
2180 * "valid" or "preferred" for a time longer than
2181 * (TEMP_VALID_LIFETIME) or
2182 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR),
2185 age = (now - ift->cstamp) / HZ;
2186 max_valid = in6_dev->cnf.temp_valid_lft - age;
2190 max_prefered = in6_dev->cnf.temp_prefered_lft -
2191 in6_dev->cnf.max_desync_factor -
2193 if (max_prefered < 0)
2196 if (valid_lft > max_valid)
2197 valid_lft = max_valid;
2199 if (prefered_lft > max_prefered)
2200 prefered_lft = max_prefered;
2202 spin_lock(&ift->lock);
2204 ift->valid_lft = valid_lft;
2205 ift->prefered_lft = prefered_lft;
2207 if (prefered_lft > 0)
2208 ift->flags &= ~IFA_F_DEPRECATED;
2210 spin_unlock(&ift->lock);
2211 if (!(flags&IFA_F_TENTATIVE))
2212 ipv6_ifa_notify(0, ift);
2215 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
2217 * When a new public address is created as
2218 * described in [ADDRCONF], also create a new
2219 * temporary address. Also create a temporary
2220 * address if it's enabled but no temporary
2221 * address currently exists.
2223 read_unlock_bh(&in6_dev->lock);
2224 ipv6_create_tempaddr(ifp, NULL);
2226 read_unlock_bh(&in6_dev->lock);
2233 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2234 in6_dev_put(in6_dev);
2238 * Set destination address.
2239 * Special case for SIT interfaces where we create a new "virtual"
2242 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2244 struct in6_ifreq ireq;
2245 struct net_device *dev;
2251 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2254 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2260 #if IS_ENABLED(CONFIG_IPV6_SIT)
2261 if (dev->type == ARPHRD_SIT) {
2262 const struct net_device_ops *ops = dev->netdev_ops;
2264 struct ip_tunnel_parm p;
2266 err = -EADDRNOTAVAIL;
2267 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2270 memset(&p, 0, sizeof(p));
2271 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2275 p.iph.protocol = IPPROTO_IPV6;
2277 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2279 if (ops->ndo_do_ioctl) {
2280 mm_segment_t oldfs = get_fs();
2283 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2290 dev = __dev_get_by_name(net, p.name);
2293 err = dev_open(dev);
2304 * Manual configuration of address on an interface
2306 static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx,
2307 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2310 struct inet6_ifaddr *ifp;
2311 struct inet6_dev *idev;
2312 struct net_device *dev;
2316 unsigned long timeout;
2323 /* check the lifetime */
2324 if (!valid_lft || prefered_lft > valid_lft)
2327 dev = __dev_get_by_index(net, ifindex);
2331 idev = addrconf_add_dev(dev);
2333 return PTR_ERR(idev);
2335 scope = ipv6_addr_scope(pfx);
2337 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2338 if (addrconf_finite_timeout(timeout)) {
2339 expires = jiffies_to_clock_t(timeout * HZ);
2340 valid_lft = timeout;
2341 flags = RTF_EXPIRES;
2345 ifa_flags |= IFA_F_PERMANENT;
2348 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2349 if (addrconf_finite_timeout(timeout)) {
2351 ifa_flags |= IFA_F_DEPRECATED;
2352 prefered_lft = timeout;
2355 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2358 spin_lock_bh(&ifp->lock);
2359 ifp->valid_lft = valid_lft;
2360 ifp->prefered_lft = prefered_lft;
2361 ifp->tstamp = jiffies;
2362 spin_unlock_bh(&ifp->lock);
2364 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2367 * Note that section 3.1 of RFC 4429 indicates
2368 * that the Optimistic flag should not be set for
2369 * manually configured addresses
2371 addrconf_dad_start(ifp);
2377 return PTR_ERR(ifp);
2380 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
2383 struct inet6_ifaddr *ifp;
2384 struct inet6_dev *idev;
2385 struct net_device *dev;
2390 dev = __dev_get_by_index(net, ifindex);
2394 if ((idev = __in6_dev_get(dev)) == NULL)
2397 read_lock_bh(&idev->lock);
2398 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2399 if (ifp->prefix_len == plen &&
2400 ipv6_addr_equal(pfx, &ifp->addr)) {
2402 read_unlock_bh(&idev->lock);
2406 /* If the last address is deleted administratively,
2407 disable IPv6 on this interface.
2409 if (list_empty(&idev->addr_list))
2410 addrconf_ifdown(idev->dev, 1);
2414 read_unlock_bh(&idev->lock);
2415 return -EADDRNOTAVAIL;
2419 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2421 struct in6_ifreq ireq;
2424 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2427 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2431 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2432 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2433 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2438 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2440 struct in6_ifreq ireq;
2443 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2446 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2450 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2451 ireq.ifr6_prefixlen);
2456 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2457 int plen, int scope)
2459 struct inet6_ifaddr *ifp;
2461 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2463 spin_lock_bh(&ifp->lock);
2464 ifp->flags &= ~IFA_F_TENTATIVE;
2465 spin_unlock_bh(&ifp->lock);
2466 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2471 #if IS_ENABLED(CONFIG_IPV6_SIT)
2472 static void sit_add_v4_addrs(struct inet6_dev *idev)
2474 struct in6_addr addr;
2475 struct net_device *dev;
2476 struct net *net = dev_net(idev->dev);
2481 memset(&addr, 0, sizeof(struct in6_addr));
2482 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2484 if (idev->dev->flags&IFF_POINTOPOINT) {
2485 addr.s6_addr32[0] = htonl(0xfe800000);
2488 scope = IPV6_ADDR_COMPATv4;
2491 if (addr.s6_addr32[3]) {
2492 add_addr(idev, &addr, 128, scope);
2496 for_each_netdev(net, dev) {
2497 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2498 if (in_dev && (dev->flags & IFF_UP)) {
2499 struct in_ifaddr *ifa;
2503 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2506 addr.s6_addr32[3] = ifa->ifa_local;
2508 if (ifa->ifa_scope == RT_SCOPE_LINK)
2510 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2511 if (idev->dev->flags&IFF_POINTOPOINT)
2515 if (idev->dev->flags&IFF_POINTOPOINT)
2520 add_addr(idev, &addr, plen, flag);
2527 static void init_loopback(struct net_device *dev)
2529 struct inet6_dev *idev;
2535 if ((idev = ipv6_find_idev(dev)) == NULL) {
2536 pr_debug("%s: add_dev failed\n", __func__);
2540 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2543 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
2545 struct inet6_ifaddr *ifp;
2546 u32 addr_flags = IFA_F_PERMANENT;
2548 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2549 if (idev->cnf.optimistic_dad &&
2550 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2551 addr_flags |= IFA_F_OPTIMISTIC;
2555 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2557 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2558 addrconf_dad_start(ifp);
2563 static void addrconf_dev_config(struct net_device *dev)
2565 struct in6_addr addr;
2566 struct inet6_dev *idev;
2570 if ((dev->type != ARPHRD_ETHER) &&
2571 (dev->type != ARPHRD_FDDI) &&
2572 (dev->type != ARPHRD_ARCNET) &&
2573 (dev->type != ARPHRD_INFINIBAND) &&
2574 (dev->type != ARPHRD_IEEE802154)) {
2575 /* Alas, we support only Ethernet autoconfiguration. */
2579 idev = addrconf_add_dev(dev);
2583 memset(&addr, 0, sizeof(struct in6_addr));
2584 addr.s6_addr32[0] = htonl(0xFE800000);
2586 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2587 addrconf_add_linklocal(idev, &addr);
2590 #if IS_ENABLED(CONFIG_IPV6_SIT)
2591 static void addrconf_sit_config(struct net_device *dev)
2593 struct inet6_dev *idev;
2598 * Configure the tunnel with one of our IPv4
2599 * addresses... we should configure all of
2600 * our v4 addrs in the tunnel
2603 if ((idev = ipv6_find_idev(dev)) == NULL) {
2604 pr_debug("%s: add_dev failed\n", __func__);
2608 if (dev->priv_flags & IFF_ISATAP) {
2609 struct in6_addr addr;
2611 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2612 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2613 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2614 addrconf_add_linklocal(idev, &addr);
2618 sit_add_v4_addrs(idev);
2620 if (dev->flags&IFF_POINTOPOINT)
2621 addrconf_add_mroute(dev);
2627 #if IS_ENABLED(CONFIG_NET_IPGRE)
2628 static void addrconf_gre_config(struct net_device *dev)
2630 struct inet6_dev *idev;
2631 struct in6_addr addr;
2633 pr_info("%s(%s)\n", __func__, dev->name);
2637 if ((idev = ipv6_find_idev(dev)) == NULL) {
2638 pr_debug("%s: add_dev failed\n", __func__);
2642 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2643 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2645 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2646 addrconf_add_linklocal(idev, &addr);
2651 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2653 struct in6_addr lladdr;
2655 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2656 addrconf_add_linklocal(idev, &lladdr);
2662 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2664 struct net_device *link_dev;
2665 struct net *net = dev_net(idev->dev);
2667 /* first try to inherit the link-local address from the link device */
2668 if (idev->dev->iflink &&
2669 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2670 if (!ipv6_inherit_linklocal(idev, link_dev))
2673 /* then try to inherit it from any device */
2674 for_each_netdev(net, link_dev) {
2675 if (!ipv6_inherit_linklocal(idev, link_dev))
2678 pr_debug("init ip6-ip6: add_linklocal failed\n");
2682 * Autoconfigure tunnel with a link-local address so routing protocols,
2683 * DHCPv6, MLD etc. can be run over the virtual link
2686 static void addrconf_ip6_tnl_config(struct net_device *dev)
2688 struct inet6_dev *idev;
2692 idev = addrconf_add_dev(dev);
2694 pr_debug("init ip6-ip6: add_dev failed\n");
2697 ip6_tnl_add_linklocal(idev);
2700 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2703 struct net_device *dev = (struct net_device *) data;
2704 struct inet6_dev *idev = __in6_dev_get(dev);
2705 int run_pending = 0;
2709 case NETDEV_REGISTER:
2710 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2711 idev = ipv6_add_dev(dev);
2713 return notifier_from_errno(-ENOMEM);
2719 if (dev->flags & IFF_SLAVE)
2722 if (event == NETDEV_UP) {
2723 if (!addrconf_qdisc_ok(dev)) {
2724 /* device is not ready yet. */
2725 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
2730 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2731 idev = ipv6_add_dev(dev);
2734 idev->if_flags |= IF_READY;
2738 if (!addrconf_qdisc_ok(dev)) {
2739 /* device is still not ready. */
2744 if (idev->if_flags & IF_READY)
2745 /* device is already configured. */
2747 idev->if_flags |= IF_READY;
2750 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
2756 switch (dev->type) {
2757 #if IS_ENABLED(CONFIG_IPV6_SIT)
2759 addrconf_sit_config(dev);
2762 #if IS_ENABLED(CONFIG_NET_IPGRE)
2764 addrconf_gre_config(dev);
2767 case ARPHRD_TUNNEL6:
2768 addrconf_ip6_tnl_config(dev);
2770 case ARPHRD_LOOPBACK:
2775 addrconf_dev_config(dev);
2781 addrconf_dad_run(idev);
2784 * If the MTU changed during the interface down,
2785 * when the interface up, the changed MTU must be
2786 * reflected in the idev as well as routers.
2788 if (idev->cnf.mtu6 != dev->mtu &&
2789 dev->mtu >= IPV6_MIN_MTU) {
2790 rt6_mtu_change(dev, dev->mtu);
2791 idev->cnf.mtu6 = dev->mtu;
2793 idev->tstamp = jiffies;
2794 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2797 * If the changed mtu during down is lower than
2798 * IPV6_MIN_MTU stop IPv6 on this interface.
2800 if (dev->mtu < IPV6_MIN_MTU)
2801 addrconf_ifdown(dev, 1);
2805 case NETDEV_CHANGEMTU:
2806 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2807 rt6_mtu_change(dev, dev->mtu);
2808 idev->cnf.mtu6 = dev->mtu;
2812 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2813 idev = ipv6_add_dev(dev);
2819 * MTU falled under IPV6_MIN_MTU.
2820 * Stop IPv6 on this interface.
2824 case NETDEV_UNREGISTER:
2826 * Remove all addresses from this interface.
2828 addrconf_ifdown(dev, event != NETDEV_DOWN);
2831 case NETDEV_CHANGENAME:
2833 snmp6_unregister_dev(idev);
2834 addrconf_sysctl_unregister(idev);
2835 addrconf_sysctl_register(idev);
2836 err = snmp6_register_dev(idev);
2838 return notifier_from_errno(err);
2842 case NETDEV_PRE_TYPE_CHANGE:
2843 case NETDEV_POST_TYPE_CHANGE:
2844 addrconf_type_change(dev, event);
2852 * addrconf module should be notified of a device going up
2854 static struct notifier_block ipv6_dev_notf = {
2855 .notifier_call = addrconf_notify,
2858 static void addrconf_type_change(struct net_device *dev, unsigned long event)
2860 struct inet6_dev *idev;
2863 idev = __in6_dev_get(dev);
2865 if (event == NETDEV_POST_TYPE_CHANGE)
2866 ipv6_mc_remap(idev);
2867 else if (event == NETDEV_PRE_TYPE_CHANGE)
2868 ipv6_mc_unmap(idev);
2871 static int addrconf_ifdown(struct net_device *dev, int how)
2873 struct net *net = dev_net(dev);
2874 struct inet6_dev *idev;
2875 struct inet6_ifaddr *ifa;
2880 rt6_ifdown(net, dev);
2881 neigh_ifdown(&nd_tbl, dev);
2883 idev = __in6_dev_get(dev);
2888 * Step 1: remove reference to ipv6 device from parent device.
2894 /* protected by rtnl_lock */
2895 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
2897 /* Step 1.5: remove snmp6 entry */
2898 snmp6_unregister_dev(idev);
2902 /* Step 2: clear hash table */
2903 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
2904 struct hlist_head *h = &inet6_addr_lst[i];
2905 struct hlist_node *n;
2907 spin_lock_bh(&addrconf_hash_lock);
2909 hlist_for_each_entry_rcu(ifa, n, h, addr_lst) {
2910 if (ifa->idev == idev) {
2911 hlist_del_init_rcu(&ifa->addr_lst);
2912 addrconf_del_timer(ifa);
2916 spin_unlock_bh(&addrconf_hash_lock);
2919 write_lock_bh(&idev->lock);
2921 /* Step 2: clear flags for stateless addrconf */
2923 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2925 #ifdef CONFIG_IPV6_PRIVACY
2926 if (how && del_timer(&idev->regen_timer))
2929 /* Step 3: clear tempaddr list */
2930 while (!list_empty(&idev->tempaddr_list)) {
2931 ifa = list_first_entry(&idev->tempaddr_list,
2932 struct inet6_ifaddr, tmp_list);
2933 list_del(&ifa->tmp_list);
2934 write_unlock_bh(&idev->lock);
2935 spin_lock_bh(&ifa->lock);
2938 in6_ifa_put(ifa->ifpub);
2941 spin_unlock_bh(&ifa->lock);
2943 write_lock_bh(&idev->lock);
2947 while (!list_empty(&idev->addr_list)) {
2948 ifa = list_first_entry(&idev->addr_list,
2949 struct inet6_ifaddr, if_list);
2950 addrconf_del_timer(ifa);
2952 list_del(&ifa->if_list);
2954 write_unlock_bh(&idev->lock);
2956 spin_lock_bh(&ifa->state_lock);
2958 ifa->state = INET6_IFADDR_STATE_DEAD;
2959 spin_unlock_bh(&ifa->state_lock);
2961 if (state != INET6_IFADDR_STATE_DEAD) {
2962 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2963 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2967 write_lock_bh(&idev->lock);
2970 write_unlock_bh(&idev->lock);
2972 /* Step 5: Discard multicast list */
2974 ipv6_mc_destroy_dev(idev);
2978 idev->tstamp = jiffies;
2980 /* Last: Shot the device (if unregistered) */
2982 addrconf_sysctl_unregister(idev);
2983 neigh_parms_release(&nd_tbl, idev->nd_parms);
2984 neigh_ifdown(&nd_tbl, dev);
2990 static void addrconf_rs_timer(unsigned long data)
2992 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2993 struct inet6_dev *idev = ifp->idev;
2995 read_lock(&idev->lock);
2996 if (idev->dead || !(idev->if_flags & IF_READY))
2999 if (!ipv6_accept_ra(idev))
3002 /* Announcement received after solicitation was sent */
3003 if (idev->if_flags & IF_RA_RCVD)
3006 spin_lock(&ifp->lock);
3007 if (ifp->probes++ < idev->cnf.rtr_solicits) {
3008 /* The wait after the last probe can be shorter */
3009 addrconf_mod_timer(ifp, AC_RS,
3010 (ifp->probes == idev->cnf.rtr_solicits) ?
3011 idev->cnf.rtr_solicit_delay :
3012 idev->cnf.rtr_solicit_interval);
3013 spin_unlock(&ifp->lock);
3015 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
3017 spin_unlock(&ifp->lock);
3019 * Note: we do not support deprecated "all on-link"
3020 * assumption any longer.
3022 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3026 read_unlock(&idev->lock);
3031 * Duplicate Address Detection
3033 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3035 unsigned long rand_num;
3036 struct inet6_dev *idev = ifp->idev;
3038 if (ifp->flags & IFA_F_OPTIMISTIC)
3041 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
3043 ifp->probes = idev->cnf.dad_transmits;
3044 addrconf_mod_timer(ifp, AC_DAD, rand_num);
3047 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3049 struct inet6_dev *idev = ifp->idev;
3050 struct net_device *dev = idev->dev;
3052 addrconf_join_solict(dev, &ifp->addr);
3054 net_srandom(ifp->addr.s6_addr32[3]);
3056 read_lock_bh(&idev->lock);
3057 spin_lock(&ifp->lock);
3058 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3061 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3062 idev->cnf.accept_dad < 1 ||
3063 !(ifp->flags&IFA_F_TENTATIVE) ||
3064 ifp->flags & IFA_F_NODAD) {
3065 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3066 spin_unlock(&ifp->lock);
3067 read_unlock_bh(&idev->lock);
3069 addrconf_dad_completed(ifp);
3073 if (!(idev->if_flags & IF_READY)) {
3074 spin_unlock(&ifp->lock);
3075 read_unlock_bh(&idev->lock);
3077 * If the device is not ready:
3078 * - keep it tentative if it is a permanent address.
3079 * - otherwise, kill it.
3082 addrconf_dad_stop(ifp, 0);
3087 * Optimistic nodes can start receiving
3090 if (ifp->flags & IFA_F_OPTIMISTIC)
3091 ip6_ins_rt(ifp->rt);
3093 addrconf_dad_kick(ifp);
3095 spin_unlock(&ifp->lock);
3096 read_unlock_bh(&idev->lock);
3099 static void addrconf_dad_timer(unsigned long data)
3101 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
3102 struct inet6_dev *idev = ifp->idev;
3103 struct in6_addr mcaddr;
3105 if (!ifp->probes && addrconf_dad_end(ifp))
3108 read_lock(&idev->lock);
3109 if (idev->dead || !(idev->if_flags & IF_READY)) {
3110 read_unlock(&idev->lock);
3114 spin_lock(&ifp->lock);
3115 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3116 spin_unlock(&ifp->lock);
3117 read_unlock(&idev->lock);
3121 if (ifp->probes == 0) {
3123 * DAD was successful
3126 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3127 spin_unlock(&ifp->lock);
3128 read_unlock(&idev->lock);
3130 addrconf_dad_completed(ifp);
3136 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
3137 spin_unlock(&ifp->lock);
3138 read_unlock(&idev->lock);
3140 /* send a neighbour solicitation for our addr */
3141 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3142 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
3147 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3149 struct net_device *dev = ifp->idev->dev;
3152 * Configure the address for reception. Now it is valid.
3155 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3157 /* If added prefix is link local and we are prepared to process
3158 router advertisements, start sending router solicitations.
3161 if (ipv6_accept_ra(ifp->idev) &&
3162 ifp->idev->cnf.rtr_solicits > 0 &&
3163 (dev->flags&IFF_LOOPBACK) == 0 &&
3164 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
3166 * If a host as already performed a random delay
3167 * [...] as part of DAD [...] there is no need
3168 * to delay again before sending the first RS
3170 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
3172 spin_lock_bh(&ifp->lock);
3174 ifp->idev->if_flags |= IF_RS_SENT;
3175 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
3176 spin_unlock_bh(&ifp->lock);
3180 static void addrconf_dad_run(struct inet6_dev *idev)
3182 struct inet6_ifaddr *ifp;
3184 read_lock_bh(&idev->lock);
3185 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3186 spin_lock(&ifp->lock);
3187 if (ifp->flags & IFA_F_TENTATIVE &&
3188 ifp->state == INET6_IFADDR_STATE_DAD)
3189 addrconf_dad_kick(ifp);
3190 spin_unlock(&ifp->lock);
3192 read_unlock_bh(&idev->lock);
3195 #ifdef CONFIG_PROC_FS
3196 struct if6_iter_state {
3197 struct seq_net_private p;
3202 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3204 struct inet6_ifaddr *ifa = NULL;
3205 struct if6_iter_state *state = seq->private;
3206 struct net *net = seq_file_net(seq);
3209 /* initial bucket if pos is 0 */
3215 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3216 struct hlist_node *n;
3217 hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket],
3219 if (!net_eq(dev_net(ifa->idev->dev), net))
3221 /* sync with offset */
3222 if (p < state->offset) {
3230 /* prepare for next bucket */
3237 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3238 struct inet6_ifaddr *ifa)
3240 struct if6_iter_state *state = seq->private;
3241 struct net *net = seq_file_net(seq);
3242 struct hlist_node *n = &ifa->addr_lst;
3244 hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst) {
3245 if (!net_eq(dev_net(ifa->idev->dev), net))
3251 while (++state->bucket < IN6_ADDR_HSIZE) {
3253 hlist_for_each_entry_rcu_bh(ifa, n,
3254 &inet6_addr_lst[state->bucket], addr_lst) {
3255 if (!net_eq(dev_net(ifa->idev->dev), net))
3265 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3269 return if6_get_first(seq, *pos);
3272 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3274 struct inet6_ifaddr *ifa;
3276 ifa = if6_get_next(seq, v);
3281 static void if6_seq_stop(struct seq_file *seq, void *v)
3284 rcu_read_unlock_bh();
3287 static int if6_seq_show(struct seq_file *seq, void *v)
3289 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3290 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3292 ifp->idev->dev->ifindex,
3296 ifp->idev->dev->name);
3300 static const struct seq_operations if6_seq_ops = {
3301 .start = if6_seq_start,
3302 .next = if6_seq_next,
3303 .show = if6_seq_show,
3304 .stop = if6_seq_stop,
3307 static int if6_seq_open(struct inode *inode, struct file *file)
3309 return seq_open_net(inode, file, &if6_seq_ops,
3310 sizeof(struct if6_iter_state));
3313 static const struct file_operations if6_fops = {
3314 .owner = THIS_MODULE,
3315 .open = if6_seq_open,
3317 .llseek = seq_lseek,
3318 .release = seq_release_net,
3321 static int __net_init if6_proc_net_init(struct net *net)
3323 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
3328 static void __net_exit if6_proc_net_exit(struct net *net)
3330 proc_net_remove(net, "if_inet6");
3333 static struct pernet_operations if6_proc_net_ops = {
3334 .init = if6_proc_net_init,
3335 .exit = if6_proc_net_exit,
3338 int __init if6_proc_init(void)
3340 return register_pernet_subsys(&if6_proc_net_ops);
3343 void if6_proc_exit(void)
3345 unregister_pernet_subsys(&if6_proc_net_ops);
3347 #endif /* CONFIG_PROC_FS */
3349 #if IS_ENABLED(CONFIG_IPV6_MIP6)
3350 /* Check if address is a home address configured on any interface. */
3351 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3354 struct inet6_ifaddr *ifp = NULL;
3355 struct hlist_node *n;
3356 unsigned int hash = inet6_addr_hash(addr);
3359 hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) {
3360 if (!net_eq(dev_net(ifp->idev->dev), net))
3362 if (ipv6_addr_equal(&ifp->addr, addr) &&
3363 (ifp->flags & IFA_F_HOMEADDRESS)) {
3368 rcu_read_unlock_bh();
3374 * Periodic address status verification
3377 static void addrconf_verify(unsigned long foo)
3379 unsigned long now, next, next_sec, next_sched;
3380 struct inet6_ifaddr *ifp;
3381 struct hlist_node *node;
3385 spin_lock(&addrconf_verify_lock);
3387 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3389 del_timer(&addr_chk_timer);
3391 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3393 hlist_for_each_entry_rcu_bh(ifp, node,
3394 &inet6_addr_lst[i], addr_lst) {
3397 if (ifp->flags & IFA_F_PERMANENT)
3400 spin_lock(&ifp->lock);
3401 /* We try to batch several events at once. */
3402 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3404 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3405 age >= ifp->valid_lft) {
3406 spin_unlock(&ifp->lock);
3410 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3411 spin_unlock(&ifp->lock);
3413 } else if (age >= ifp->prefered_lft) {
3414 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3417 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3419 ifp->flags |= IFA_F_DEPRECATED;
3422 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3423 next = ifp->tstamp + ifp->valid_lft * HZ;
3425 spin_unlock(&ifp->lock);
3430 ipv6_ifa_notify(0, ifp);
3434 #ifdef CONFIG_IPV6_PRIVACY
3435 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3436 !(ifp->flags&IFA_F_TENTATIVE)) {
3437 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3438 ifp->idev->cnf.dad_transmits *
3439 ifp->idev->nd_parms->retrans_time / HZ;
3441 if (age >= ifp->prefered_lft - regen_advance) {
3442 struct inet6_ifaddr *ifpub = ifp->ifpub;
3443 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3444 next = ifp->tstamp + ifp->prefered_lft * HZ;
3445 if (!ifp->regen_count && ifpub) {
3448 in6_ifa_hold(ifpub);
3449 spin_unlock(&ifp->lock);
3451 spin_lock(&ifpub->lock);
3452 ifpub->regen_count = 0;
3453 spin_unlock(&ifpub->lock);
3454 ipv6_create_tempaddr(ifpub, ifp);
3459 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3460 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3461 spin_unlock(&ifp->lock);
3464 /* ifp->prefered_lft <= ifp->valid_lft */
3465 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3466 next = ifp->tstamp + ifp->prefered_lft * HZ;
3467 spin_unlock(&ifp->lock);
3472 next_sec = round_jiffies_up(next);
3475 /* If rounded timeout is accurate enough, accept it. */
3476 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3477 next_sched = next_sec;
3479 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3480 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3481 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3483 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3484 now, next, next_sec, next_sched));
3486 addr_chk_timer.expires = next_sched;
3487 add_timer(&addr_chk_timer);
3488 spin_unlock(&addrconf_verify_lock);
3489 rcu_read_unlock_bh();
3492 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3494 struct in6_addr *pfx = NULL;
3497 pfx = nla_data(addr);
3500 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3503 pfx = nla_data(local);
3509 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3510 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3511 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3512 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3516 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3518 struct net *net = sock_net(skb->sk);
3519 struct ifaddrmsg *ifm;
3520 struct nlattr *tb[IFA_MAX+1];
3521 struct in6_addr *pfx;
3524 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3528 ifm = nlmsg_data(nlh);
3529 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3533 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3536 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3537 u32 prefered_lft, u32 valid_lft)
3541 unsigned long timeout;
3543 if (!valid_lft || (prefered_lft > valid_lft))
3546 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3547 if (addrconf_finite_timeout(timeout)) {
3548 expires = jiffies_to_clock_t(timeout * HZ);
3549 valid_lft = timeout;
3550 flags = RTF_EXPIRES;
3554 ifa_flags |= IFA_F_PERMANENT;
3557 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3558 if (addrconf_finite_timeout(timeout)) {
3560 ifa_flags |= IFA_F_DEPRECATED;
3561 prefered_lft = timeout;
3564 spin_lock_bh(&ifp->lock);
3565 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3566 ifp->tstamp = jiffies;
3567 ifp->valid_lft = valid_lft;
3568 ifp->prefered_lft = prefered_lft;
3570 spin_unlock_bh(&ifp->lock);
3571 if (!(ifp->flags&IFA_F_TENTATIVE))
3572 ipv6_ifa_notify(0, ifp);
3574 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3582 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3584 struct net *net = sock_net(skb->sk);
3585 struct ifaddrmsg *ifm;
3586 struct nlattr *tb[IFA_MAX+1];
3587 struct in6_addr *pfx;
3588 struct inet6_ifaddr *ifa;
3589 struct net_device *dev;
3590 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3594 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3598 ifm = nlmsg_data(nlh);
3599 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3603 if (tb[IFA_CACHEINFO]) {
3604 struct ifa_cacheinfo *ci;
3606 ci = nla_data(tb[IFA_CACHEINFO]);
3607 valid_lft = ci->ifa_valid;
3608 preferred_lft = ci->ifa_prefered;
3610 preferred_lft = INFINITY_LIFE_TIME;
3611 valid_lft = INFINITY_LIFE_TIME;
3614 dev = __dev_get_by_index(net, ifm->ifa_index);
3618 /* We ignore other flags so far. */
3619 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3621 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3624 * It would be best to check for !NLM_F_CREATE here but
3625 * userspace alreay relies on not having to provide this.
3627 return inet6_addr_add(net, ifm->ifa_index, pfx,
3628 ifm->ifa_prefixlen, ifa_flags,
3629 preferred_lft, valid_lft);
3632 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3633 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3636 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3643 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3644 u8 scope, int ifindex)
3646 struct ifaddrmsg *ifm;
3648 ifm = nlmsg_data(nlh);
3649 ifm->ifa_family = AF_INET6;
3650 ifm->ifa_prefixlen = prefixlen;
3651 ifm->ifa_flags = flags;
3652 ifm->ifa_scope = scope;
3653 ifm->ifa_index = ifindex;
3656 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3657 unsigned long tstamp, u32 preferred, u32 valid)
3659 struct ifa_cacheinfo ci;
3661 ci.cstamp = cstamp_delta(cstamp);
3662 ci.tstamp = cstamp_delta(tstamp);
3663 ci.ifa_prefered = preferred;
3664 ci.ifa_valid = valid;
3666 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3669 static inline int rt_scope(int ifa_scope)
3671 if (ifa_scope & IFA_HOST)
3672 return RT_SCOPE_HOST;
3673 else if (ifa_scope & IFA_LINK)
3674 return RT_SCOPE_LINK;
3675 else if (ifa_scope & IFA_SITE)
3676 return RT_SCOPE_SITE;
3678 return RT_SCOPE_UNIVERSE;
3681 static inline int inet6_ifaddr_msgsize(void)
3683 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3684 + nla_total_size(16) /* IFA_ADDRESS */
3685 + nla_total_size(sizeof(struct ifa_cacheinfo));
3688 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3689 u32 portid, u32 seq, int event, unsigned int flags)
3691 struct nlmsghdr *nlh;
3692 u32 preferred, valid;
3694 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3698 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3699 ifa->idev->dev->ifindex);
3701 if (!(ifa->flags&IFA_F_PERMANENT)) {
3702 preferred = ifa->prefered_lft;
3703 valid = ifa->valid_lft;
3704 if (preferred != INFINITY_LIFE_TIME) {
3705 long tval = (jiffies - ifa->tstamp)/HZ;
3706 if (preferred > tval)
3710 if (valid != INFINITY_LIFE_TIME) {
3718 preferred = INFINITY_LIFE_TIME;
3719 valid = INFINITY_LIFE_TIME;
3722 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3723 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3724 nlmsg_cancel(skb, nlh);
3728 return nlmsg_end(skb, nlh);
3731 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3732 u32 portid, u32 seq, int event, u16 flags)
3734 struct nlmsghdr *nlh;
3735 u8 scope = RT_SCOPE_UNIVERSE;
3736 int ifindex = ifmca->idev->dev->ifindex;
3738 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3739 scope = RT_SCOPE_SITE;
3741 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3745 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3746 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3747 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3748 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3749 nlmsg_cancel(skb, nlh);
3753 return nlmsg_end(skb, nlh);
3756 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3757 u32 portid, u32 seq, int event, unsigned int flags)
3759 struct nlmsghdr *nlh;
3760 u8 scope = RT_SCOPE_UNIVERSE;
3761 int ifindex = ifaca->aca_idev->dev->ifindex;
3763 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3764 scope = RT_SCOPE_SITE;
3766 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3770 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3771 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3772 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3773 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3774 nlmsg_cancel(skb, nlh);
3778 return nlmsg_end(skb, nlh);
3787 /* called with rcu_read_lock() */
3788 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3789 struct netlink_callback *cb, enum addr_type_t type,
3790 int s_ip_idx, int *p_ip_idx)
3792 struct ifmcaddr6 *ifmca;
3793 struct ifacaddr6 *ifaca;
3795 int ip_idx = *p_ip_idx;
3797 read_lock_bh(&idev->lock);
3799 case UNICAST_ADDR: {
3800 struct inet6_ifaddr *ifa;
3802 /* unicast address incl. temp addr */
3803 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3804 if (++ip_idx < s_ip_idx)
3806 err = inet6_fill_ifaddr(skb, ifa,
3807 NETLINK_CB(cb->skb).portid,
3816 case MULTICAST_ADDR:
3817 /* multicast address */
3818 for (ifmca = idev->mc_list; ifmca;
3819 ifmca = ifmca->next, ip_idx++) {
3820 if (ip_idx < s_ip_idx)
3822 err = inet6_fill_ifmcaddr(skb, ifmca,
3823 NETLINK_CB(cb->skb).portid,
3832 /* anycast address */
3833 for (ifaca = idev->ac_list; ifaca;
3834 ifaca = ifaca->aca_next, ip_idx++) {
3835 if (ip_idx < s_ip_idx)
3837 err = inet6_fill_ifacaddr(skb, ifaca,
3838 NETLINK_CB(cb->skb).portid,
3849 read_unlock_bh(&idev->lock);
3854 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3855 enum addr_type_t type)
3857 struct net *net = sock_net(skb->sk);
3860 int s_idx, s_ip_idx;
3861 struct net_device *dev;
3862 struct inet6_dev *idev;
3863 struct hlist_head *head;
3864 struct hlist_node *node;
3867 s_idx = idx = cb->args[1];
3868 s_ip_idx = ip_idx = cb->args[2];
3871 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3873 head = &net->dev_index_head[h];
3874 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3877 if (h > s_h || idx > s_idx)
3880 idev = __in6_dev_get(dev);
3884 if (in6_dump_addrs(idev, skb, cb, type,
3885 s_ip_idx, &ip_idx) <= 0)
3895 cb->args[2] = ip_idx;
3900 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3902 enum addr_type_t type = UNICAST_ADDR;
3904 return inet6_dump_addr(skb, cb, type);
3907 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3909 enum addr_type_t type = MULTICAST_ADDR;
3911 return inet6_dump_addr(skb, cb, type);
3915 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3917 enum addr_type_t type = ANYCAST_ADDR;
3919 return inet6_dump_addr(skb, cb, type);
3922 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
3925 struct net *net = sock_net(in_skb->sk);
3926 struct ifaddrmsg *ifm;
3927 struct nlattr *tb[IFA_MAX+1];
3928 struct in6_addr *addr = NULL;
3929 struct net_device *dev = NULL;
3930 struct inet6_ifaddr *ifa;
3931 struct sk_buff *skb;
3934 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3938 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3944 ifm = nlmsg_data(nlh);
3946 dev = __dev_get_by_index(net, ifm->ifa_index);
3948 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
3950 err = -EADDRNOTAVAIL;
3954 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
3960 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
3961 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3963 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3964 WARN_ON(err == -EMSGSIZE);
3968 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
3975 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3977 struct sk_buff *skb;
3978 struct net *net = dev_net(ifa->idev->dev);
3981 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3985 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3987 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3988 WARN_ON(err == -EMSGSIZE);
3992 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3996 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3999 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4000 __s32 *array, int bytes)
4002 BUG_ON(bytes < (DEVCONF_MAX * 4));
4004 memset(array, 0, bytes);
4005 array[DEVCONF_FORWARDING] = cnf->forwarding;
4006 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4007 array[DEVCONF_MTU6] = cnf->mtu6;
4008 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4009 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4010 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4011 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4012 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4013 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4014 jiffies_to_msecs(cnf->rtr_solicit_interval);
4015 array[DEVCONF_RTR_SOLICIT_DELAY] =
4016 jiffies_to_msecs(cnf->rtr_solicit_delay);
4017 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4018 #ifdef CONFIG_IPV6_PRIVACY
4019 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4020 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4021 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4022 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4023 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4025 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4026 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4027 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4028 #ifdef CONFIG_IPV6_ROUTER_PREF
4029 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4030 array[DEVCONF_RTR_PROBE_INTERVAL] =
4031 jiffies_to_msecs(cnf->rtr_probe_interval);
4032 #ifdef CONFIG_IPV6_ROUTE_INFO
4033 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4036 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4037 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4038 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4039 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4041 #ifdef CONFIG_IPV6_MROUTE
4042 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4044 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4045 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4046 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4047 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4050 static inline size_t inet6_ifla6_size(void)
4052 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4053 + nla_total_size(sizeof(struct ifla_cacheinfo))
4054 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4055 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4056 + nla_total_size(ICMP6_MIB_MAX * 8); /* IFLA_INET6_ICMP6STATS */
4059 static inline size_t inet6_if_nlmsg_size(void)
4061 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4062 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4063 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4064 + nla_total_size(4) /* IFLA_MTU */
4065 + nla_total_size(4) /* IFLA_LINK */
4066 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4069 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4070 int items, int bytes)
4073 int pad = bytes - sizeof(u64) * items;
4076 /* Use put_unaligned() because stats may not be aligned for u64. */
4077 put_unaligned(items, &stats[0]);
4078 for (i = 1; i < items; i++)
4079 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4081 memset(&stats[items], 0, pad);
4084 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
4085 int items, int bytes, size_t syncpoff)
4088 int pad = bytes - sizeof(u64) * items;
4091 /* Use put_unaligned() because stats may not be aligned for u64. */
4092 put_unaligned(items, &stats[0]);
4093 for (i = 1; i < items; i++)
4094 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4096 memset(&stats[items], 0, pad);
4099 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4103 case IFLA_INET6_STATS:
4104 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
4105 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
4107 case IFLA_INET6_ICMP6STATS:
4108 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
4113 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4116 struct ifla_cacheinfo ci;
4118 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4119 goto nla_put_failure;
4120 ci.max_reasm_len = IPV6_MAXPLEN;
4121 ci.tstamp = cstamp_delta(idev->tstamp);
4122 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4123 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
4124 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4125 goto nla_put_failure;
4126 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4128 goto nla_put_failure;
4129 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4131 /* XXX - MC not implemented */
4133 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4135 goto nla_put_failure;
4136 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4138 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4140 goto nla_put_failure;
4141 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4149 static size_t inet6_get_link_af_size(const struct net_device *dev)
4151 if (!__in6_dev_get(dev))
4154 return inet6_ifla6_size();
4157 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4159 struct inet6_dev *idev = __in6_dev_get(dev);
4164 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4170 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4171 u32 portid, u32 seq, int event, unsigned int flags)
4173 struct net_device *dev = idev->dev;
4174 struct ifinfomsg *hdr;
4175 struct nlmsghdr *nlh;
4178 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
4182 hdr = nlmsg_data(nlh);
4183 hdr->ifi_family = AF_INET6;
4185 hdr->ifi_type = dev->type;
4186 hdr->ifi_index = dev->ifindex;
4187 hdr->ifi_flags = dev_get_flags(dev);
4188 hdr->ifi_change = 0;
4190 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4192 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4193 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4194 (dev->ifindex != dev->iflink &&
4195 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4196 goto nla_put_failure;
4197 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4198 if (protoinfo == NULL)
4199 goto nla_put_failure;
4201 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4202 goto nla_put_failure;
4204 nla_nest_end(skb, protoinfo);
4205 return nlmsg_end(skb, nlh);
4208 nlmsg_cancel(skb, nlh);
4212 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4214 struct net *net = sock_net(skb->sk);
4217 struct net_device *dev;
4218 struct inet6_dev *idev;
4219 struct hlist_head *head;
4220 struct hlist_node *node;
4223 s_idx = cb->args[1];
4226 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4228 head = &net->dev_index_head[h];
4229 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
4232 idev = __in6_dev_get(dev);
4235 if (inet6_fill_ifinfo(skb, idev,
4236 NETLINK_CB(cb->skb).portid,
4238 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4252 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4254 struct sk_buff *skb;
4255 struct net *net = dev_net(idev->dev);
4258 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4262 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4264 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4265 WARN_ON(err == -EMSGSIZE);
4269 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4273 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4276 static inline size_t inet6_prefix_nlmsg_size(void)
4278 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4279 + nla_total_size(sizeof(struct in6_addr))
4280 + nla_total_size(sizeof(struct prefix_cacheinfo));
4283 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4284 struct prefix_info *pinfo, u32 portid, u32 seq,
4285 int event, unsigned int flags)
4287 struct prefixmsg *pmsg;
4288 struct nlmsghdr *nlh;
4289 struct prefix_cacheinfo ci;
4291 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
4295 pmsg = nlmsg_data(nlh);
4296 pmsg->prefix_family = AF_INET6;
4297 pmsg->prefix_pad1 = 0;
4298 pmsg->prefix_pad2 = 0;
4299 pmsg->prefix_ifindex = idev->dev->ifindex;
4300 pmsg->prefix_len = pinfo->prefix_len;
4301 pmsg->prefix_type = pinfo->type;
4302 pmsg->prefix_pad3 = 0;
4303 pmsg->prefix_flags = 0;
4305 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4306 if (pinfo->autoconf)
4307 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4309 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4310 goto nla_put_failure;
4311 ci.preferred_time = ntohl(pinfo->prefered);
4312 ci.valid_time = ntohl(pinfo->valid);
4313 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4314 goto nla_put_failure;
4315 return nlmsg_end(skb, nlh);
4318 nlmsg_cancel(skb, nlh);
4322 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4323 struct prefix_info *pinfo)
4325 struct sk_buff *skb;
4326 struct net *net = dev_net(idev->dev);
4329 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4333 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4335 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4336 WARN_ON(err == -EMSGSIZE);
4340 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4344 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4347 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4349 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4354 * If the address was optimistic
4355 * we inserted the route at the start of
4356 * our DAD process, so we don't need
4359 if (!(ifp->rt->rt6i_node))
4360 ip6_ins_rt(ifp->rt);
4361 if (ifp->idev->cnf.forwarding)
4362 addrconf_join_anycast(ifp);
4365 if (ifp->idev->cnf.forwarding)
4366 addrconf_leave_anycast(ifp);
4367 addrconf_leave_solict(ifp->idev, &ifp->addr);
4368 dst_hold(&ifp->rt->dst);
4370 if (ip6_del_rt(ifp->rt))
4371 dst_free(&ifp->rt->dst);
4376 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4379 if (likely(ifp->idev->dead == 0))
4380 __ipv6_ifa_notify(event, ifp);
4381 rcu_read_unlock_bh();
4384 #ifdef CONFIG_SYSCTL
4387 int addrconf_sysctl_forward(ctl_table *ctl, int write,
4388 void __user *buffer, size_t *lenp, loff_t *ppos)
4390 int *valp = ctl->data;
4397 * ctl->data points to idev->cnf.forwarding, we should
4398 * not modify it until we get the rtnl lock.
4403 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4406 ret = addrconf_fixup_forwarding(ctl, valp, val);
4412 static void dev_disable_change(struct inet6_dev *idev)
4414 if (!idev || !idev->dev)
4417 if (idev->cnf.disable_ipv6)
4418 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4420 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4423 static void addrconf_disable_change(struct net *net, __s32 newf)
4425 struct net_device *dev;
4426 struct inet6_dev *idev;
4429 for_each_netdev_rcu(net, dev) {
4430 idev = __in6_dev_get(dev);
4432 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4433 idev->cnf.disable_ipv6 = newf;
4435 dev_disable_change(idev);
4441 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
4446 if (!rtnl_trylock())
4447 return restart_syscall();
4449 net = (struct net *)table->extra2;
4453 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4458 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4459 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4460 addrconf_disable_change(net, newf);
4461 } else if ((!newf) ^ (!old))
4462 dev_disable_change((struct inet6_dev *)table->extra1);
4469 int addrconf_sysctl_disable(ctl_table *ctl, int write,
4470 void __user *buffer, size_t *lenp, loff_t *ppos)
4472 int *valp = ctl->data;
4479 * ctl->data points to idev->cnf.disable_ipv6, we should
4480 * not modify it until we get the rtnl lock.
4485 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4488 ret = addrconf_disable_ipv6(ctl, valp, val);
4494 static struct addrconf_sysctl_table
4496 struct ctl_table_header *sysctl_header;
4497 ctl_table addrconf_vars[DEVCONF_MAX+1];
4498 } addrconf_sysctl __read_mostly = {
4499 .sysctl_header = NULL,
4502 .procname = "forwarding",
4503 .data = &ipv6_devconf.forwarding,
4504 .maxlen = sizeof(int),
4506 .proc_handler = addrconf_sysctl_forward,
4509 .procname = "hop_limit",
4510 .data = &ipv6_devconf.hop_limit,
4511 .maxlen = sizeof(int),
4513 .proc_handler = proc_dointvec,
4517 .data = &ipv6_devconf.mtu6,
4518 .maxlen = sizeof(int),
4520 .proc_handler = proc_dointvec,
4523 .procname = "accept_ra",
4524 .data = &ipv6_devconf.accept_ra,
4525 .maxlen = sizeof(int),
4527 .proc_handler = proc_dointvec,
4530 .procname = "accept_redirects",
4531 .data = &ipv6_devconf.accept_redirects,
4532 .maxlen = sizeof(int),
4534 .proc_handler = proc_dointvec,
4537 .procname = "autoconf",
4538 .data = &ipv6_devconf.autoconf,
4539 .maxlen = sizeof(int),
4541 .proc_handler = proc_dointvec,
4544 .procname = "dad_transmits",
4545 .data = &ipv6_devconf.dad_transmits,
4546 .maxlen = sizeof(int),
4548 .proc_handler = proc_dointvec,
4551 .procname = "router_solicitations",
4552 .data = &ipv6_devconf.rtr_solicits,
4553 .maxlen = sizeof(int),
4555 .proc_handler = proc_dointvec,
4558 .procname = "router_solicitation_interval",
4559 .data = &ipv6_devconf.rtr_solicit_interval,
4560 .maxlen = sizeof(int),
4562 .proc_handler = proc_dointvec_jiffies,
4565 .procname = "router_solicitation_delay",
4566 .data = &ipv6_devconf.rtr_solicit_delay,
4567 .maxlen = sizeof(int),
4569 .proc_handler = proc_dointvec_jiffies,
4572 .procname = "force_mld_version",
4573 .data = &ipv6_devconf.force_mld_version,
4574 .maxlen = sizeof(int),
4576 .proc_handler = proc_dointvec,
4578 #ifdef CONFIG_IPV6_PRIVACY
4580 .procname = "use_tempaddr",
4581 .data = &ipv6_devconf.use_tempaddr,
4582 .maxlen = sizeof(int),
4584 .proc_handler = proc_dointvec,
4587 .procname = "temp_valid_lft",
4588 .data = &ipv6_devconf.temp_valid_lft,
4589 .maxlen = sizeof(int),
4591 .proc_handler = proc_dointvec,
4594 .procname = "temp_prefered_lft",
4595 .data = &ipv6_devconf.temp_prefered_lft,
4596 .maxlen = sizeof(int),
4598 .proc_handler = proc_dointvec,
4601 .procname = "regen_max_retry",
4602 .data = &ipv6_devconf.regen_max_retry,
4603 .maxlen = sizeof(int),
4605 .proc_handler = proc_dointvec,
4608 .procname = "max_desync_factor",
4609 .data = &ipv6_devconf.max_desync_factor,
4610 .maxlen = sizeof(int),
4612 .proc_handler = proc_dointvec,
4616 .procname = "max_addresses",
4617 .data = &ipv6_devconf.max_addresses,
4618 .maxlen = sizeof(int),
4620 .proc_handler = proc_dointvec,
4623 .procname = "accept_ra_defrtr",
4624 .data = &ipv6_devconf.accept_ra_defrtr,
4625 .maxlen = sizeof(int),
4627 .proc_handler = proc_dointvec,
4630 .procname = "accept_ra_pinfo",
4631 .data = &ipv6_devconf.accept_ra_pinfo,
4632 .maxlen = sizeof(int),
4634 .proc_handler = proc_dointvec,
4636 #ifdef CONFIG_IPV6_ROUTER_PREF
4638 .procname = "accept_ra_rtr_pref",
4639 .data = &ipv6_devconf.accept_ra_rtr_pref,
4640 .maxlen = sizeof(int),
4642 .proc_handler = proc_dointvec,
4645 .procname = "router_probe_interval",
4646 .data = &ipv6_devconf.rtr_probe_interval,
4647 .maxlen = sizeof(int),
4649 .proc_handler = proc_dointvec_jiffies,
4651 #ifdef CONFIG_IPV6_ROUTE_INFO
4653 .procname = "accept_ra_rt_info_max_plen",
4654 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4655 .maxlen = sizeof(int),
4657 .proc_handler = proc_dointvec,
4662 .procname = "proxy_ndp",
4663 .data = &ipv6_devconf.proxy_ndp,
4664 .maxlen = sizeof(int),
4666 .proc_handler = proc_dointvec,
4669 .procname = "accept_source_route",
4670 .data = &ipv6_devconf.accept_source_route,
4671 .maxlen = sizeof(int),
4673 .proc_handler = proc_dointvec,
4675 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4677 .procname = "optimistic_dad",
4678 .data = &ipv6_devconf.optimistic_dad,
4679 .maxlen = sizeof(int),
4681 .proc_handler = proc_dointvec,
4685 #ifdef CONFIG_IPV6_MROUTE
4687 .procname = "mc_forwarding",
4688 .data = &ipv6_devconf.mc_forwarding,
4689 .maxlen = sizeof(int),
4691 .proc_handler = proc_dointvec,
4695 .procname = "disable_ipv6",
4696 .data = &ipv6_devconf.disable_ipv6,
4697 .maxlen = sizeof(int),
4699 .proc_handler = addrconf_sysctl_disable,
4702 .procname = "accept_dad",
4703 .data = &ipv6_devconf.accept_dad,
4704 .maxlen = sizeof(int),
4706 .proc_handler = proc_dointvec,
4709 .procname = "force_tllao",
4710 .data = &ipv6_devconf.force_tllao,
4711 .maxlen = sizeof(int),
4713 .proc_handler = proc_dointvec
4716 .procname = "ndisc_notify",
4717 .data = &ipv6_devconf.ndisc_notify,
4718 .maxlen = sizeof(int),
4720 .proc_handler = proc_dointvec
4728 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4729 struct inet6_dev *idev, struct ipv6_devconf *p)
4732 struct addrconf_sysctl_table *t;
4733 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
4735 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4739 for (i = 0; t->addrconf_vars[i].data; i++) {
4740 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
4741 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4742 t->addrconf_vars[i].extra2 = net;
4745 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
4747 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
4748 if (t->sysctl_header == NULL)
4760 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4762 struct addrconf_sysctl_table *t;
4764 if (p->sysctl == NULL)
4769 unregister_net_sysctl_table(t->sysctl_header);
4773 static void addrconf_sysctl_register(struct inet6_dev *idev)
4775 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
4776 &ndisc_ifinfo_sysctl_change);
4777 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4781 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4783 __addrconf_sysctl_unregister(&idev->cnf);
4784 neigh_sysctl_unregister(idev->nd_parms);
4790 static int __net_init addrconf_init_net(struct net *net)
4793 struct ipv6_devconf *all, *dflt;
4796 all = &ipv6_devconf;
4797 dflt = &ipv6_devconf_dflt;
4799 if (!net_eq(net, &init_net)) {
4800 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4804 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4806 goto err_alloc_dflt;
4808 /* these will be inherited by all namespaces */
4809 dflt->autoconf = ipv6_defaults.autoconf;
4810 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
4813 net->ipv6.devconf_all = all;
4814 net->ipv6.devconf_dflt = dflt;
4816 #ifdef CONFIG_SYSCTL
4817 err = __addrconf_sysctl_register(net, "all", NULL, all);
4821 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
4827 #ifdef CONFIG_SYSCTL
4829 __addrconf_sysctl_unregister(all);
4839 static void __net_exit addrconf_exit_net(struct net *net)
4841 #ifdef CONFIG_SYSCTL
4842 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4843 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4845 if (!net_eq(net, &init_net)) {
4846 kfree(net->ipv6.devconf_dflt);
4847 kfree(net->ipv6.devconf_all);
4851 static struct pernet_operations addrconf_ops = {
4852 .init = addrconf_init_net,
4853 .exit = addrconf_exit_net,
4860 int register_inet6addr_notifier(struct notifier_block *nb)
4862 return atomic_notifier_chain_register(&inet6addr_chain, nb);
4864 EXPORT_SYMBOL(register_inet6addr_notifier);
4866 int unregister_inet6addr_notifier(struct notifier_block *nb)
4868 return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
4870 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4872 static struct rtnl_af_ops inet6_ops = {
4874 .fill_link_af = inet6_fill_link_af,
4875 .get_link_af_size = inet6_get_link_af_size,
4879 * Init / cleanup code
4882 int __init addrconf_init(void)
4886 err = ipv6_addr_label_init();
4888 pr_crit("%s: cannot initialize default policy table: %d\n",
4893 err = register_pernet_subsys(&addrconf_ops);
4897 /* The addrconf netdev notifier requires that loopback_dev
4898 * has it's ipv6 private information allocated and setup
4899 * before it can bring up and give link-local addresses
4900 * to other devices which are up.
4902 * Unfortunately, loopback_dev is not necessarily the first
4903 * entry in the global dev_base list of net devices. In fact,
4904 * it is likely to be the very last entry on that list.
4905 * So this causes the notifier registry below to try and
4906 * give link-local addresses to all devices besides loopback_dev
4907 * first, then loopback_dev, which cases all the non-loopback_dev
4908 * devices to fail to get a link-local address.
4910 * So, as a temporary fix, allocate the ipv6 structure for
4911 * loopback_dev first by hand.
4912 * Longer term, all of the dependencies ipv6 has upon the loopback
4913 * device and it being up should be removed.
4916 if (!ipv6_add_dev(init_net.loopback_dev))
4922 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4923 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
4925 register_netdevice_notifier(&ipv6_dev_notf);
4929 err = rtnl_af_register(&inet6_ops);
4933 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
4938 /* Only the first call to __rtnl_register can fail */
4939 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
4940 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
4941 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
4942 inet6_dump_ifaddr, NULL);
4943 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
4944 inet6_dump_ifmcaddr, NULL);
4945 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
4946 inet6_dump_ifacaddr, NULL);
4947 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
4950 ipv6_addr_label_rtnl_register();
4954 rtnl_af_unregister(&inet6_ops);
4956 unregister_netdevice_notifier(&ipv6_dev_notf);
4958 unregister_pernet_subsys(&addrconf_ops);
4960 ipv6_addr_label_cleanup();
4965 void addrconf_cleanup(void)
4967 struct net_device *dev;
4970 unregister_netdevice_notifier(&ipv6_dev_notf);
4971 unregister_pernet_subsys(&addrconf_ops);
4972 ipv6_addr_label_cleanup();
4976 __rtnl_af_unregister(&inet6_ops);
4978 /* clean dev list */
4979 for_each_netdev(&init_net, dev) {
4980 if (__in6_dev_get(dev) == NULL)
4982 addrconf_ifdown(dev, 1);
4984 addrconf_ifdown(init_net.loopback_dev, 2);
4989 spin_lock_bh(&addrconf_hash_lock);
4990 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4991 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
4992 spin_unlock_bh(&addrconf_hash_lock);
4994 del_timer(&addr_chk_timer);