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 #include <linux/errno.h>
42 #include <linux/types.h>
43 #include <linux/kernel.h>
44 #include <linux/socket.h>
45 #include <linux/sockios.h>
46 #include <linux/net.h>
47 #include <linux/in6.h>
48 #include <linux/netdevice.h>
49 #include <linux/if_addr.h>
50 #include <linux/if_arp.h>
51 #include <linux/if_arcnet.h>
52 #include <linux/if_infiniband.h>
53 #include <linux/route.h>
54 #include <linux/inetdevice.h>
55 #include <linux/init.h>
56 #include <linux/slab.h>
58 #include <linux/sysctl.h>
60 #include <linux/capability.h>
61 #include <linux/delay.h>
62 #include <linux/notifier.h>
63 #include <linux/string.h>
65 #include <net/net_namespace.h>
70 #include <net/protocol.h>
71 #include <net/ndisc.h>
72 #include <net/ip6_route.h>
73 #include <net/addrconf.h>
76 #include <net/netlink.h>
77 #include <net/pkt_sched.h>
78 #include <linux/if_tunnel.h>
79 #include <linux/rtnetlink.h>
81 #ifdef CONFIG_IPV6_PRIVACY
82 #include <linux/random.h>
85 #include <linux/uaccess.h>
86 #include <asm/unaligned.h>
88 #include <linux/proc_fs.h>
89 #include <linux/seq_file.h>
91 /* Set to 3 to get tracing... */
95 #define ADBG(x) printk x
100 #define INFINITY_LIFE_TIME 0xFFFFFFFF
101 #define TIME_DELTA(a, b) ((unsigned long)((long)(a) - (long)(b)))
103 #define ADDRCONF_TIMER_FUZZ_MINUS (HZ > 50 ? HZ/50 : 1)
104 #define ADDRCONF_TIMER_FUZZ (HZ / 4)
105 #define ADDRCONF_TIMER_FUZZ_MAX (HZ)
108 static void addrconf_sysctl_register(struct inet6_dev *idev);
109 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
111 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
115 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
120 #ifdef CONFIG_IPV6_PRIVACY
121 static int __ipv6_regen_rndid(struct inet6_dev *idev);
122 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
123 static void ipv6_regen_rndid(unsigned long data);
125 static int desync_factor = MAX_DESYNC_FACTOR * HZ;
128 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
129 static int ipv6_count_addresses(struct inet6_dev *idev);
132 * Configured unicast address hash table
134 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
135 static DEFINE_SPINLOCK(addrconf_hash_lock);
137 static void addrconf_verify(unsigned long);
139 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
140 static DEFINE_SPINLOCK(addrconf_verify_lock);
142 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
143 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
145 static void addrconf_type_change(struct net_device *dev,
146 unsigned long event);
147 static int addrconf_ifdown(struct net_device *dev, int how);
149 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
150 static void addrconf_dad_timer(unsigned long data);
151 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
152 static void addrconf_dad_run(struct inet6_dev *idev);
153 static void addrconf_rs_timer(unsigned long data);
154 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
155 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
157 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
158 struct prefix_info *pinfo);
159 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
160 struct net_device *dev);
162 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
164 static struct ipv6_devconf ipv6_devconf __read_mostly = {
166 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
167 .mtu6 = IPV6_MIN_MTU,
169 .accept_redirects = 1,
171 .force_mld_version = 0,
173 .rtr_solicits = MAX_RTR_SOLICITATIONS,
174 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
175 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
176 #ifdef CONFIG_IPV6_PRIVACY
178 .temp_valid_lft = TEMP_VALID_LIFETIME,
179 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
180 .regen_max_retry = REGEN_MAX_RETRY,
181 .max_desync_factor = MAX_DESYNC_FACTOR,
183 .max_addresses = IPV6_MAX_ADDRESSES,
184 .accept_ra_defrtr = 1,
185 .accept_ra_pinfo = 1,
186 #ifdef CONFIG_IPV6_ROUTER_PREF
187 .accept_ra_rtr_pref = 1,
188 .rtr_probe_interval = 60 * HZ,
189 #ifdef CONFIG_IPV6_ROUTE_INFO
190 .accept_ra_rt_info_max_plen = 0,
194 .accept_source_route = 0, /* we do not accept RH0 by default. */
199 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
201 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
202 .mtu6 = IPV6_MIN_MTU,
204 .accept_redirects = 1,
207 .rtr_solicits = MAX_RTR_SOLICITATIONS,
208 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
209 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
210 #ifdef CONFIG_IPV6_PRIVACY
212 .temp_valid_lft = TEMP_VALID_LIFETIME,
213 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
214 .regen_max_retry = REGEN_MAX_RETRY,
215 .max_desync_factor = MAX_DESYNC_FACTOR,
217 .max_addresses = IPV6_MAX_ADDRESSES,
218 .accept_ra_defrtr = 1,
219 .accept_ra_pinfo = 1,
220 #ifdef CONFIG_IPV6_ROUTER_PREF
221 .accept_ra_rtr_pref = 1,
222 .rtr_probe_interval = 60 * HZ,
223 #ifdef CONFIG_IPV6_ROUTE_INFO
224 .accept_ra_rt_info_max_plen = 0,
228 .accept_source_route = 0, /* we do not accept RH0 by default. */
233 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
234 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
235 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
236 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
237 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
239 /* Check if a valid qdisc is available */
240 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
242 return !qdisc_tx_is_noop(dev);
245 /* Check if a route is valid prefix route */
246 static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
248 return ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0);
251 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
253 if (del_timer(&ifp->timer))
257 enum addrconf_timer_t {
263 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
264 enum addrconf_timer_t what,
267 if (!del_timer(&ifp->timer))
272 ifp->timer.function = addrconf_dad_timer;
275 ifp->timer.function = addrconf_rs_timer;
280 ifp->timer.expires = jiffies + when;
281 add_timer(&ifp->timer);
284 static int snmp6_alloc_dev(struct inet6_dev *idev)
286 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
287 sizeof(struct ipstats_mib),
288 __alignof__(struct ipstats_mib)) < 0)
290 if (snmp_mib_init((void __percpu **)idev->stats.icmpv6,
291 sizeof(struct icmpv6_mib),
292 __alignof__(struct icmpv6_mib)) < 0)
294 if (snmp_mib_init((void __percpu **)idev->stats.icmpv6msg,
295 sizeof(struct icmpv6msg_mib),
296 __alignof__(struct icmpv6msg_mib)) < 0)
302 snmp_mib_free((void __percpu **)idev->stats.icmpv6);
304 snmp_mib_free((void __percpu **)idev->stats.ipv6);
309 static void snmp6_free_dev(struct inet6_dev *idev)
311 snmp_mib_free((void __percpu **)idev->stats.icmpv6msg);
312 snmp_mib_free((void __percpu **)idev->stats.icmpv6);
313 snmp_mib_free((void __percpu **)idev->stats.ipv6);
316 /* Nobody refers to this device, we may destroy it. */
318 static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
320 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
324 void in6_dev_finish_destroy(struct inet6_dev *idev)
326 struct net_device *dev = idev->dev;
328 WARN_ON(!list_empty(&idev->addr_list));
329 WARN_ON(idev->mc_list != NULL);
331 #ifdef NET_REFCNT_DEBUG
332 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
336 pr_warning("Freeing alive inet6 device %p\n", idev);
339 snmp6_free_dev(idev);
340 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
343 EXPORT_SYMBOL(in6_dev_finish_destroy);
345 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
347 struct inet6_dev *ndev;
351 if (dev->mtu < IPV6_MIN_MTU)
354 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
359 rwlock_init(&ndev->lock);
361 INIT_LIST_HEAD(&ndev->addr_list);
363 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
364 ndev->cnf.mtu6 = dev->mtu;
365 ndev->cnf.sysctl = NULL;
366 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
367 if (ndev->nd_parms == NULL) {
371 if (ndev->cnf.forwarding)
372 dev_disable_lro(dev);
373 /* We refer to the device */
376 if (snmp6_alloc_dev(ndev) < 0) {
378 "%s(): cannot allocate memory for statistics; dev=%s.\n",
379 __func__, dev->name));
380 neigh_parms_release(&nd_tbl, ndev->nd_parms);
382 in6_dev_finish_destroy(ndev);
386 if (snmp6_register_dev(ndev) < 0) {
388 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
389 __func__, dev->name));
390 neigh_parms_release(&nd_tbl, ndev->nd_parms);
392 in6_dev_finish_destroy(ndev);
396 /* One reference from device. We must do this before
397 * we invoke __ipv6_regen_rndid().
401 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
402 ndev->cnf.accept_dad = -1;
404 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
405 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
407 "%s: Disabled Multicast RS\n",
409 ndev->cnf.rtr_solicits = 0;
413 #ifdef CONFIG_IPV6_PRIVACY
414 INIT_LIST_HEAD(&ndev->tempaddr_list);
415 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
416 if ((dev->flags&IFF_LOOPBACK) ||
417 dev->type == ARPHRD_TUNNEL ||
418 dev->type == ARPHRD_TUNNEL6 ||
419 dev->type == ARPHRD_SIT ||
420 dev->type == ARPHRD_NONE) {
422 "%s: Disabled Privacy Extensions\n",
424 ndev->cnf.use_tempaddr = -1;
427 ipv6_regen_rndid((unsigned long) ndev);
431 if (netif_running(dev) && addrconf_qdisc_ok(dev))
432 ndev->if_flags |= IF_READY;
434 ipv6_mc_init_dev(ndev);
435 ndev->tstamp = jiffies;
436 addrconf_sysctl_register(ndev);
437 /* protected by rtnl_lock */
438 rcu_assign_pointer(dev->ip6_ptr, ndev);
440 /* Join all-node multicast group */
441 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
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)
465 static void dev_forward_change(struct inet6_dev *idev)
467 struct net_device *dev;
468 struct inet6_ifaddr *ifa;
473 if (idev->cnf.forwarding)
474 dev_disable_lro(dev);
475 if (dev && (dev->flags & IFF_MULTICAST)) {
476 if (idev->cnf.forwarding)
477 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
479 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
482 list_for_each_entry(ifa, &idev->addr_list, if_list) {
483 if (ifa->flags&IFA_F_TENTATIVE)
485 if (idev->cnf.forwarding)
486 addrconf_join_anycast(ifa);
488 addrconf_leave_anycast(ifa);
493 static void addrconf_forward_change(struct net *net, __s32 newf)
495 struct net_device *dev;
496 struct inet6_dev *idev;
499 for_each_netdev_rcu(net, dev) {
500 idev = __in6_dev_get(dev);
502 int changed = (!idev->cnf.forwarding) ^ (!newf);
503 idev->cnf.forwarding = newf;
505 dev_forward_change(idev);
511 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
515 net = (struct net *)table->extra2;
516 if (p == &net->ipv6.devconf_dflt->forwarding)
519 if (!rtnl_trylock()) {
520 /* Restore the original values before restarting */
522 return restart_syscall();
525 if (p == &net->ipv6.devconf_all->forwarding) {
526 __s32 newf = net->ipv6.devconf_all->forwarding;
527 net->ipv6.devconf_dflt->forwarding = newf;
528 addrconf_forward_change(net, newf);
529 } else if ((!*p) ^ (!old))
530 dev_forward_change((struct inet6_dev *)table->extra1);
534 rt6_purge_dflt_routers(net);
539 static void inet6_ifa_finish_destroy_rcu(struct rcu_head *head)
541 struct inet6_ifaddr *ifp = container_of(head, struct inet6_ifaddr, rcu);
545 /* Nobody refers to this ifaddr, destroy it */
546 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
548 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
550 #ifdef NET_REFCNT_DEBUG
551 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
554 in6_dev_put(ifp->idev);
556 if (del_timer(&ifp->timer))
557 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
559 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
560 pr_warning("Freeing alive inet6 address %p\n", ifp);
563 dst_release(&ifp->rt->dst);
565 call_rcu(&ifp->rcu, inet6_ifa_finish_destroy_rcu);
569 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
572 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
575 * Each device address list is sorted in order of scope -
576 * global before linklocal.
578 list_for_each(p, &idev->addr_list) {
579 struct inet6_ifaddr *ifa
580 = list_entry(p, struct inet6_ifaddr, if_list);
581 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
585 list_add_tail(&ifp->if_list, p);
588 static u32 ipv6_addr_hash(const struct in6_addr *addr)
591 * We perform the hash function over the last 64 bits of the address
592 * This will include the IEEE address token on links that support it.
594 return jhash_2words((__force u32)addr->s6_addr32[2],
595 (__force u32)addr->s6_addr32[3], 0)
596 & (IN6_ADDR_HSIZE - 1);
599 /* On success it returns ifp with increased reference count */
601 static struct inet6_ifaddr *
602 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
603 int scope, u32 flags)
605 struct inet6_ifaddr *ifa = NULL;
609 int addr_type = ipv6_addr_type(addr);
611 if (addr_type == IPV6_ADDR_ANY ||
612 addr_type & IPV6_ADDR_MULTICAST ||
613 (!(idev->dev->flags & IFF_LOOPBACK) &&
614 addr_type & IPV6_ADDR_LOOPBACK))
615 return ERR_PTR(-EADDRNOTAVAIL);
619 err = -ENODEV; /*XXX*/
623 if (idev->cnf.disable_ipv6) {
628 spin_lock(&addrconf_hash_lock);
630 /* Ignore adding duplicate addresses on an interface */
631 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
632 ADBG(("ipv6_add_addr: already assigned\n"));
637 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
640 ADBG(("ipv6_add_addr: malloc failed\n"));
645 rt = addrconf_dst_alloc(idev, addr, 0);
651 ipv6_addr_copy(&ifa->addr, addr);
653 spin_lock_init(&ifa->lock);
654 spin_lock_init(&ifa->state_lock);
655 init_timer(&ifa->timer);
656 INIT_HLIST_NODE(&ifa->addr_lst);
657 ifa->timer.data = (unsigned long) ifa;
659 ifa->prefix_len = pfxlen;
660 ifa->flags = flags | IFA_F_TENTATIVE;
661 ifa->cstamp = ifa->tstamp = jiffies;
666 * part one of RFC 4429, section 3.3
667 * We should not configure an address as
668 * optimistic if we do not yet know the link
669 * layer address of our nexhop router
672 if (rt->rt6i_nexthop == NULL)
673 ifa->flags &= ~IFA_F_OPTIMISTIC;
680 /* Add to big hash table */
681 hash = ipv6_addr_hash(addr);
683 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
684 spin_unlock(&addrconf_hash_lock);
686 write_lock(&idev->lock);
687 /* Add to inet6_dev unicast addr list. */
688 ipv6_link_dev_addr(idev, ifa);
690 #ifdef CONFIG_IPV6_PRIVACY
691 if (ifa->flags&IFA_F_TEMPORARY) {
692 list_add(&ifa->tmp_list, &idev->tempaddr_list);
698 write_unlock(&idev->lock);
700 rcu_read_unlock_bh();
702 if (likely(err == 0))
703 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
711 spin_unlock(&addrconf_hash_lock);
715 /* This function wants to get referenced ifp and releases it before return */
717 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
719 struct inet6_ifaddr *ifa, *ifn;
720 struct inet6_dev *idev = ifp->idev;
723 int deleted = 0, onlink = 0;
724 unsigned long expires = jiffies;
726 hash = ipv6_addr_hash(&ifp->addr);
728 spin_lock_bh(&ifp->state_lock);
730 ifp->state = INET6_IFADDR_STATE_DEAD;
731 spin_unlock_bh(&ifp->state_lock);
733 if (state == INET6_IFADDR_STATE_DEAD)
736 spin_lock_bh(&addrconf_hash_lock);
737 hlist_del_init_rcu(&ifp->addr_lst);
738 spin_unlock_bh(&addrconf_hash_lock);
740 write_lock_bh(&idev->lock);
741 #ifdef CONFIG_IPV6_PRIVACY
742 if (ifp->flags&IFA_F_TEMPORARY) {
743 list_del(&ifp->tmp_list);
745 in6_ifa_put(ifp->ifpub);
752 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
754 list_del_init(&ifp->if_list);
757 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
761 } else if (ifp->flags & IFA_F_PERMANENT) {
762 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
764 if (ifa->flags & IFA_F_PERMANENT) {
769 unsigned long lifetime;
774 spin_lock(&ifa->lock);
776 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
778 * Note: Because this address is
779 * not permanent, lifetime <
780 * LONG_MAX / HZ here.
782 if (time_before(expires,
783 ifa->tstamp + lifetime * HZ))
784 expires = ifa->tstamp + lifetime * HZ;
785 spin_unlock(&ifa->lock);
790 write_unlock_bh(&idev->lock);
792 addrconf_del_timer(ifp);
794 ipv6_ifa_notify(RTM_DELADDR, ifp);
796 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
799 * Purge or update corresponding prefix
801 * 1) we don't purge prefix here if address was not permanent.
802 * prefix is managed by its own lifetime.
803 * 2) if there're no addresses, delete prefix.
804 * 3) if there're still other permanent address(es),
805 * corresponding prefix is still permanent.
806 * 4) otherwise, update prefix lifetime to the
807 * longest valid lifetime among the corresponding
808 * addresses on the device.
809 * Note: subsequent RA will update lifetime.
813 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
814 struct in6_addr prefix;
816 struct net *net = dev_net(ifp->idev->dev);
817 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
818 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
820 if (rt && addrconf_is_prefix_route(rt)) {
824 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
825 rt->rt6i_expires = expires;
826 rt->rt6i_flags |= RTF_EXPIRES;
829 dst_release(&rt->dst);
836 #ifdef CONFIG_IPV6_PRIVACY
837 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
839 struct inet6_dev *idev = ifp->idev;
840 struct in6_addr addr, *tmpaddr;
841 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
842 unsigned long regen_advance;
848 write_lock(&idev->lock);
850 spin_lock_bh(&ift->lock);
851 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
852 spin_unlock_bh(&ift->lock);
859 if (idev->cnf.use_tempaddr <= 0) {
860 write_unlock(&idev->lock);
862 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
867 spin_lock_bh(&ifp->lock);
868 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
869 idev->cnf.use_tempaddr = -1; /*XXX*/
870 spin_unlock_bh(&ifp->lock);
871 write_unlock(&idev->lock);
873 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
879 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
880 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
881 spin_unlock_bh(&ifp->lock);
882 write_unlock(&idev->lock);
884 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
890 memcpy(&addr.s6_addr[8], idev->rndid, 8);
891 tmp_valid_lft = min_t(__u32,
893 idev->cnf.temp_valid_lft);
894 tmp_prefered_lft = min_t(__u32,
896 idev->cnf.temp_prefered_lft - desync_factor / HZ);
897 tmp_plen = ifp->prefix_len;
898 max_addresses = idev->cnf.max_addresses;
899 tmp_cstamp = ifp->cstamp;
900 tmp_tstamp = ifp->tstamp;
901 spin_unlock_bh(&ifp->lock);
903 regen_advance = idev->cnf.regen_max_retry *
904 idev->cnf.dad_transmits *
905 idev->nd_parms->retrans_time / HZ;
906 write_unlock(&idev->lock);
908 /* A temporary address is created only if this calculated Preferred
909 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
910 * an implementation must not create a temporary address with a zero
911 * Preferred Lifetime.
913 if (tmp_prefered_lft <= regen_advance) {
920 addr_flags = IFA_F_TEMPORARY;
921 /* set in addrconf_prefix_rcv() */
922 if (ifp->flags & IFA_F_OPTIMISTIC)
923 addr_flags |= IFA_F_OPTIMISTIC;
925 ift = !max_addresses ||
926 ipv6_count_addresses(idev) < max_addresses ?
927 ipv6_add_addr(idev, &addr, tmp_plen,
928 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
930 if (!ift || IS_ERR(ift)) {
934 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
936 write_lock(&idev->lock);
940 spin_lock_bh(&ift->lock);
942 ift->valid_lft = tmp_valid_lft;
943 ift->prefered_lft = tmp_prefered_lft;
944 ift->cstamp = tmp_cstamp;
945 ift->tstamp = tmp_tstamp;
946 spin_unlock_bh(&ift->lock);
948 addrconf_dad_start(ift, 0);
957 * Choose an appropriate source address (RFC3484)
960 IPV6_SADDR_RULE_INIT = 0,
961 IPV6_SADDR_RULE_LOCAL,
962 IPV6_SADDR_RULE_SCOPE,
963 IPV6_SADDR_RULE_PREFERRED,
964 #ifdef CONFIG_IPV6_MIP6
968 IPV6_SADDR_RULE_LABEL,
969 #ifdef CONFIG_IPV6_PRIVACY
970 IPV6_SADDR_RULE_PRIVACY,
972 IPV6_SADDR_RULE_ORCHID,
973 IPV6_SADDR_RULE_PREFIX,
977 struct ipv6_saddr_score {
980 struct inet6_ifaddr *ifa;
981 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
986 struct ipv6_saddr_dst {
987 const struct in6_addr *addr;
994 static inline int ipv6_saddr_preferred(int type)
996 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1001 static int ipv6_get_saddr_eval(struct net *net,
1002 struct ipv6_saddr_score *score,
1003 struct ipv6_saddr_dst *dst,
1008 if (i <= score->rule) {
1010 case IPV6_SADDR_RULE_SCOPE:
1011 ret = score->scopedist;
1013 case IPV6_SADDR_RULE_PREFIX:
1014 ret = score->matchlen;
1017 ret = !!test_bit(i, score->scorebits);
1023 case IPV6_SADDR_RULE_INIT:
1024 /* Rule 0: remember if hiscore is not ready yet */
1027 case IPV6_SADDR_RULE_LOCAL:
1028 /* Rule 1: Prefer same address */
1029 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1031 case IPV6_SADDR_RULE_SCOPE:
1032 /* Rule 2: Prefer appropriate scope
1037 * ---+--+-+---> scope
1039 * | d is scope of the destination.
1041 * | \ <- smaller scope is better if
1042 * B-15 | \ if scope is enough for destinaion.
1043 * | ret = B - scope (-1 <= scope >= d <= 15).
1045 * |/ <- greater is better
1046 * -C / if scope is not enough for destination.
1047 * /| ret = scope - C (-1 <= d < scope <= 15).
1049 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1050 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1051 * Assume B = 0 and we get C > 29.
1053 ret = __ipv6_addr_src_scope(score->addr_type);
1054 if (ret >= dst->scope)
1057 ret -= 128; /* 30 is enough */
1058 score->scopedist = ret;
1060 case IPV6_SADDR_RULE_PREFERRED:
1061 /* Rule 3: Avoid deprecated and optimistic addresses */
1062 ret = ipv6_saddr_preferred(score->addr_type) ||
1063 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1065 #ifdef CONFIG_IPV6_MIP6
1066 case IPV6_SADDR_RULE_HOA:
1068 /* Rule 4: Prefer home address */
1069 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1070 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1074 case IPV6_SADDR_RULE_OIF:
1075 /* Rule 5: Prefer outgoing interface */
1076 ret = (!dst->ifindex ||
1077 dst->ifindex == score->ifa->idev->dev->ifindex);
1079 case IPV6_SADDR_RULE_LABEL:
1080 /* Rule 6: Prefer matching label */
1081 ret = ipv6_addr_label(net,
1082 &score->ifa->addr, score->addr_type,
1083 score->ifa->idev->dev->ifindex) == dst->label;
1085 #ifdef CONFIG_IPV6_PRIVACY
1086 case IPV6_SADDR_RULE_PRIVACY:
1088 /* Rule 7: Prefer public address
1089 * Note: prefer temprary address if use_tempaddr >= 2
1091 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1092 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1093 score->ifa->idev->cnf.use_tempaddr >= 2;
1094 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1098 case IPV6_SADDR_RULE_ORCHID:
1099 /* Rule 8-: Prefer ORCHID vs ORCHID or
1100 * non-ORCHID vs non-ORCHID
1102 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1103 ipv6_addr_orchid(dst->addr));
1105 case IPV6_SADDR_RULE_PREFIX:
1106 /* Rule 8: Use longest matching prefix */
1107 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1115 __set_bit(i, score->scorebits);
1121 int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
1122 const struct in6_addr *daddr, unsigned int prefs,
1123 struct in6_addr *saddr)
1125 struct ipv6_saddr_score scores[2],
1126 *score = &scores[0], *hiscore = &scores[1];
1127 struct ipv6_saddr_dst dst;
1128 struct net_device *dev;
1131 dst_type = __ipv6_addr_type(daddr);
1133 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1134 dst.scope = __ipv6_addr_src_scope(dst_type);
1135 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1139 hiscore->ifa = NULL;
1143 for_each_netdev_rcu(net, dev) {
1144 struct inet6_dev *idev;
1146 /* Candidate Source Address (section 4)
1147 * - multicast and link-local destination address,
1148 * the set of candidate source address MUST only
1149 * include addresses assigned to interfaces
1150 * belonging to the same link as the outgoing
1152 * (- For site-local destination addresses, the
1153 * set of candidate source addresses MUST only
1154 * include addresses assigned to interfaces
1155 * belonging to the same site as the outgoing
1158 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1159 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1160 dst.ifindex && dev->ifindex != dst.ifindex)
1163 idev = __in6_dev_get(dev);
1167 read_lock_bh(&idev->lock);
1168 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1172 * - Tentative Address (RFC2462 section 5.4)
1173 * - A tentative address is not considered
1174 * "assigned to an interface" in the traditional
1175 * sense, unless it is also flagged as optimistic.
1176 * - Candidate Source Address (section 4)
1177 * - In any case, anycast addresses, multicast
1178 * addresses, and the unspecified address MUST
1179 * NOT be included in a candidate set.
1181 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1182 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1185 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1187 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1188 score->addr_type & IPV6_ADDR_MULTICAST)) {
1189 LIMIT_NETDEBUG(KERN_DEBUG
1190 "ADDRCONF: unspecified / multicast address "
1191 "assigned as unicast address on %s",
1197 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1199 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1200 int minihiscore, miniscore;
1202 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1203 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1205 if (minihiscore > miniscore) {
1206 if (i == IPV6_SADDR_RULE_SCOPE &&
1207 score->scopedist > 0) {
1210 * each remaining entry
1211 * has too small (not enough)
1212 * scope, because ifa entries
1213 * are sorted by their scope
1219 } else if (minihiscore < miniscore) {
1221 in6_ifa_put(hiscore->ifa);
1223 in6_ifa_hold(score->ifa);
1225 swap(hiscore, score);
1227 /* restore our iterator */
1228 score->ifa = hiscore->ifa;
1235 read_unlock_bh(&idev->lock);
1240 return -EADDRNOTAVAIL;
1242 ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1243 in6_ifa_put(hiscore->ifa);
1246 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1248 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1249 unsigned char banned_flags)
1251 struct inet6_dev *idev;
1252 int err = -EADDRNOTAVAIL;
1255 idev = __in6_dev_get(dev);
1257 struct inet6_ifaddr *ifp;
1259 read_lock_bh(&idev->lock);
1260 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1261 if (ifp->scope == IFA_LINK &&
1262 !(ifp->flags & banned_flags)) {
1263 ipv6_addr_copy(addr, &ifp->addr);
1268 read_unlock_bh(&idev->lock);
1274 static int ipv6_count_addresses(struct inet6_dev *idev)
1277 struct inet6_ifaddr *ifp;
1279 read_lock_bh(&idev->lock);
1280 list_for_each_entry(ifp, &idev->addr_list, if_list)
1282 read_unlock_bh(&idev->lock);
1286 int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1287 struct net_device *dev, int strict)
1289 struct inet6_ifaddr *ifp;
1290 struct hlist_node *node;
1291 unsigned int hash = ipv6_addr_hash(addr);
1294 hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1295 if (!net_eq(dev_net(ifp->idev->dev), net))
1297 if (ipv6_addr_equal(&ifp->addr, addr) &&
1298 !(ifp->flags&IFA_F_TENTATIVE) &&
1299 (dev == NULL || ifp->idev->dev == dev ||
1300 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1301 rcu_read_unlock_bh();
1306 rcu_read_unlock_bh();
1309 EXPORT_SYMBOL(ipv6_chk_addr);
1311 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1312 struct net_device *dev)
1314 unsigned int hash = ipv6_addr_hash(addr);
1315 struct inet6_ifaddr *ifp;
1316 struct hlist_node *node;
1318 hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1319 if (!net_eq(dev_net(ifp->idev->dev), net))
1321 if (ipv6_addr_equal(&ifp->addr, addr)) {
1322 if (dev == NULL || ifp->idev->dev == dev)
1329 int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev)
1331 struct inet6_dev *idev;
1332 struct inet6_ifaddr *ifa;
1337 idev = __in6_dev_get(dev);
1339 read_lock_bh(&idev->lock);
1340 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1341 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1346 read_unlock_bh(&idev->lock);
1352 EXPORT_SYMBOL(ipv6_chk_prefix);
1354 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1355 struct net_device *dev, int strict)
1357 struct inet6_ifaddr *ifp, *result = NULL;
1358 unsigned int hash = ipv6_addr_hash(addr);
1359 struct hlist_node *node;
1362 hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1363 if (!net_eq(dev_net(ifp->idev->dev), net))
1365 if (ipv6_addr_equal(&ifp->addr, addr)) {
1366 if (dev == NULL || ifp->idev->dev == dev ||
1367 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1374 rcu_read_unlock_bh();
1379 /* Gets referenced address, destroys ifaddr */
1381 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1383 if (ifp->flags&IFA_F_PERMANENT) {
1384 spin_lock_bh(&ifp->lock);
1385 addrconf_del_timer(ifp);
1386 ifp->flags |= IFA_F_TENTATIVE;
1388 ifp->flags |= IFA_F_DADFAILED;
1389 spin_unlock_bh(&ifp->lock);
1391 ipv6_ifa_notify(0, ifp);
1393 #ifdef CONFIG_IPV6_PRIVACY
1394 } else if (ifp->flags&IFA_F_TEMPORARY) {
1395 struct inet6_ifaddr *ifpub;
1396 spin_lock_bh(&ifp->lock);
1399 in6_ifa_hold(ifpub);
1400 spin_unlock_bh(&ifp->lock);
1401 ipv6_create_tempaddr(ifpub, ifp);
1404 spin_unlock_bh(&ifp->lock);
1412 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1416 spin_lock(&ifp->state_lock);
1417 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1418 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1421 spin_unlock(&ifp->state_lock);
1426 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1428 struct inet6_dev *idev = ifp->idev;
1430 if (addrconf_dad_end(ifp))
1433 if (net_ratelimit())
1434 printk(KERN_INFO "%s: IPv6 duplicate address %pI6c detected!\n",
1435 ifp->idev->dev->name, &ifp->addr);
1437 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1438 struct in6_addr addr;
1440 addr.s6_addr32[0] = htonl(0xfe800000);
1441 addr.s6_addr32[1] = 0;
1443 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1444 ipv6_addr_equal(&ifp->addr, &addr)) {
1445 /* DAD failed for link-local based on MAC address */
1446 idev->cnf.disable_ipv6 = 1;
1448 printk(KERN_INFO "%s: IPv6 being disabled!\n",
1449 ifp->idev->dev->name);
1453 addrconf_dad_stop(ifp, 1);
1456 /* Join to solicited addr multicast group. */
1458 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1460 struct in6_addr maddr;
1462 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1465 addrconf_addr_solict_mult(addr, &maddr);
1466 ipv6_dev_mc_inc(dev, &maddr);
1469 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1471 struct in6_addr maddr;
1473 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1476 addrconf_addr_solict_mult(addr, &maddr);
1477 __ipv6_dev_mc_dec(idev, &maddr);
1480 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1482 struct in6_addr addr;
1483 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1484 if (ipv6_addr_any(&addr))
1486 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1489 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1491 struct in6_addr addr;
1492 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1493 if (ipv6_addr_any(&addr))
1495 __ipv6_dev_ac_dec(ifp->idev, &addr);
1498 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1500 if (dev->addr_len != ETH_ALEN)
1502 memcpy(eui, dev->dev_addr, 3);
1503 memcpy(eui + 5, dev->dev_addr + 3, 3);
1506 * The zSeries OSA network cards can be shared among various
1507 * OS instances, but the OSA cards have only one MAC address.
1508 * This leads to duplicate address conflicts in conjunction
1509 * with IPv6 if more than one instance uses the same card.
1511 * The driver for these cards can deliver a unique 16-bit
1512 * identifier for each instance sharing the same card. It is
1513 * placed instead of 0xFFFE in the interface identifier. The
1514 * "u" bit of the interface identifier is not inverted in this
1515 * case. Hence the resulting interface identifier has local
1516 * scope according to RFC2373.
1519 eui[3] = (dev->dev_id >> 8) & 0xFF;
1520 eui[4] = dev->dev_id & 0xFF;
1529 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1531 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1532 if (dev->addr_len != ARCNET_ALEN)
1535 eui[7] = *(u8*)dev->dev_addr;
1539 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1541 if (dev->addr_len != INFINIBAND_ALEN)
1543 memcpy(eui, dev->dev_addr + 12, 8);
1548 int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1552 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1553 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1554 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1555 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1556 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1557 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1561 memcpy(eui + 4, &addr, 4);
1564 EXPORT_SYMBOL(__ipv6_isatap_ifid);
1566 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1568 if (dev->priv_flags & IFF_ISATAP)
1569 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1573 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1575 switch (dev->type) {
1578 case ARPHRD_IEEE802_TR:
1579 return addrconf_ifid_eui48(eui, dev);
1581 return addrconf_ifid_arcnet(eui, dev);
1582 case ARPHRD_INFINIBAND:
1583 return addrconf_ifid_infiniband(eui, dev);
1585 return addrconf_ifid_sit(eui, dev);
1590 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1593 struct inet6_ifaddr *ifp;
1595 read_lock_bh(&idev->lock);
1596 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1597 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1598 memcpy(eui, ifp->addr.s6_addr+8, 8);
1603 read_unlock_bh(&idev->lock);
1607 #ifdef CONFIG_IPV6_PRIVACY
1608 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1609 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1612 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1613 idev->rndid[0] &= ~0x02;
1616 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1617 * check if generated address is not inappropriate
1619 * - Reserved subnet anycast (RFC 2526)
1620 * 11111101 11....11 1xxxxxxx
1621 * - ISATAP (RFC4214) 6.1
1622 * 00-00-5E-FE-xx-xx-xx-xx
1624 * - XXX: already assigned to an address on the device
1626 if (idev->rndid[0] == 0xfd &&
1627 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1628 (idev->rndid[7]&0x80))
1630 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1631 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1633 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1640 static void ipv6_regen_rndid(unsigned long data)
1642 struct inet6_dev *idev = (struct inet6_dev *) data;
1643 unsigned long expires;
1646 write_lock_bh(&idev->lock);
1651 if (__ipv6_regen_rndid(idev) < 0)
1655 idev->cnf.temp_prefered_lft * HZ -
1656 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1657 if (time_before(expires, jiffies)) {
1659 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1664 if (!mod_timer(&idev->regen_timer, expires))
1668 write_unlock_bh(&idev->lock);
1669 rcu_read_unlock_bh();
1673 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1676 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1677 ret = __ipv6_regen_rndid(idev);
1687 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1688 unsigned long expires, u32 flags)
1690 struct fib6_config cfg = {
1691 .fc_table = RT6_TABLE_PREFIX,
1692 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1693 .fc_ifindex = dev->ifindex,
1694 .fc_expires = expires,
1696 .fc_flags = RTF_UP | flags,
1697 .fc_nlinfo.nl_net = dev_net(dev),
1698 .fc_protocol = RTPROT_KERNEL,
1701 ipv6_addr_copy(&cfg.fc_dst, pfx);
1703 /* Prevent useless cloning on PtP SIT.
1704 This thing is done here expecting that the whole
1705 class of non-broadcast devices need not cloning.
1707 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1708 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1709 cfg.fc_flags |= RTF_NONEXTHOP;
1712 ip6_route_add(&cfg);
1715 /* Create "default" multicast route to the interface */
1717 static void addrconf_add_mroute(struct net_device *dev)
1719 struct fib6_config cfg = {
1720 .fc_table = RT6_TABLE_LOCAL,
1721 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1722 .fc_ifindex = dev->ifindex,
1725 .fc_nlinfo.nl_net = dev_net(dev),
1728 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1730 ip6_route_add(&cfg);
1733 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1734 static void sit_route_add(struct net_device *dev)
1736 struct fib6_config cfg = {
1737 .fc_table = RT6_TABLE_MAIN,
1738 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1739 .fc_ifindex = dev->ifindex,
1741 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1742 .fc_nlinfo.nl_net = dev_net(dev),
1745 /* prefix length - 96 bits "::d.d.d.d" */
1746 ip6_route_add(&cfg);
1750 static void addrconf_add_lroute(struct net_device *dev)
1752 struct in6_addr addr;
1754 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1755 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1758 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1760 struct inet6_dev *idev;
1764 idev = ipv6_find_idev(dev);
1768 /* Add default multicast route */
1769 addrconf_add_mroute(dev);
1771 /* Add link local route */
1772 addrconf_add_lroute(dev);
1776 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1778 struct prefix_info *pinfo;
1782 struct inet6_dev *in6_dev;
1783 struct net *net = dev_net(dev);
1785 pinfo = (struct prefix_info *) opt;
1787 if (len < sizeof(struct prefix_info)) {
1788 ADBG(("addrconf: prefix option too short\n"));
1793 * Validation checks ([ADDRCONF], page 19)
1796 addr_type = ipv6_addr_type(&pinfo->prefix);
1798 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1801 valid_lft = ntohl(pinfo->valid);
1802 prefered_lft = ntohl(pinfo->prefered);
1804 if (prefered_lft > valid_lft) {
1805 if (net_ratelimit())
1806 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1810 in6_dev = in6_dev_get(dev);
1812 if (in6_dev == NULL) {
1813 if (net_ratelimit())
1814 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1819 * Two things going on here:
1820 * 1) Add routes for on-link prefixes
1821 * 2) Configure prefixes with the auto flag set
1824 if (pinfo->onlink) {
1825 struct rt6_info *rt;
1826 unsigned long rt_expires;
1828 /* Avoid arithmetic overflow. Really, we could
1829 * save rt_expires in seconds, likely valid_lft,
1830 * but it would require division in fib gc, that it
1834 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1836 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
1838 if (addrconf_finite_timeout(rt_expires))
1841 rt = rt6_lookup(net, &pinfo->prefix, NULL,
1844 if (rt && addrconf_is_prefix_route(rt)) {
1845 /* Autoconf prefix route */
1846 if (valid_lft == 0) {
1849 } else if (addrconf_finite_timeout(rt_expires)) {
1851 rt->rt6i_expires = jiffies + rt_expires;
1852 rt->rt6i_flags |= RTF_EXPIRES;
1854 rt->rt6i_flags &= ~RTF_EXPIRES;
1855 rt->rt6i_expires = 0;
1857 } else if (valid_lft) {
1858 clock_t expires = 0;
1859 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1860 if (addrconf_finite_timeout(rt_expires)) {
1862 flags |= RTF_EXPIRES;
1863 expires = jiffies_to_clock_t(rt_expires);
1865 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1866 dev, expires, flags);
1869 dst_release(&rt->dst);
1872 /* Try to figure out our local address for this prefix */
1874 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1875 struct inet6_ifaddr * ifp;
1876 struct in6_addr addr;
1877 int create = 0, update_lft = 0;
1879 if (pinfo->prefix_len == 64) {
1880 memcpy(&addr, &pinfo->prefix, 8);
1881 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1882 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1883 in6_dev_put(in6_dev);
1888 if (net_ratelimit())
1889 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1891 in6_dev_put(in6_dev);
1896 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1898 if (ifp == NULL && valid_lft) {
1899 int max_addresses = in6_dev->cnf.max_addresses;
1902 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1903 if (in6_dev->cnf.optimistic_dad &&
1904 !net->ipv6.devconf_all->forwarding)
1905 addr_flags = IFA_F_OPTIMISTIC;
1908 /* Do not allow to create too much of autoconfigured
1909 * addresses; this would be too easy way to crash kernel.
1911 if (!max_addresses ||
1912 ipv6_count_addresses(in6_dev) < max_addresses)
1913 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1914 addr_type&IPV6_ADDR_SCOPE_MASK,
1917 if (!ifp || IS_ERR(ifp)) {
1918 in6_dev_put(in6_dev);
1922 update_lft = create = 1;
1923 ifp->cstamp = jiffies;
1924 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1930 #ifdef CONFIG_IPV6_PRIVACY
1931 struct inet6_ifaddr *ift;
1935 /* update lifetime (RFC2462 5.5.3 e) */
1936 spin_lock(&ifp->lock);
1938 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1939 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1942 if (!update_lft && stored_lft) {
1943 if (valid_lft > MIN_VALID_LIFETIME ||
1944 valid_lft > stored_lft)
1946 else if (stored_lft <= MIN_VALID_LIFETIME) {
1947 /* valid_lft <= stored_lft is always true */
1949 * RFC 4862 Section 5.5.3e:
1950 * "Note that the preferred lifetime of
1951 * the corresponding address is always
1952 * reset to the Preferred Lifetime in
1953 * the received Prefix Information
1954 * option, regardless of whether the
1955 * valid lifetime is also reset or
1958 * So if the preferred lifetime in
1959 * this advertisement is different
1960 * than what we have stored, but the
1961 * valid lifetime is invalid, just
1962 * reset prefered_lft.
1964 * We must set the valid lifetime
1965 * to the stored lifetime since we'll
1966 * be updating the timestamp below,
1967 * else we'll set it back to the
1970 if (prefered_lft != ifp->prefered_lft) {
1971 valid_lft = stored_lft;
1975 valid_lft = MIN_VALID_LIFETIME;
1976 if (valid_lft < prefered_lft)
1977 prefered_lft = valid_lft;
1983 ifp->valid_lft = valid_lft;
1984 ifp->prefered_lft = prefered_lft;
1987 ifp->flags &= ~IFA_F_DEPRECATED;
1988 spin_unlock(&ifp->lock);
1990 if (!(flags&IFA_F_TENTATIVE))
1991 ipv6_ifa_notify(0, ifp);
1993 spin_unlock(&ifp->lock);
1995 #ifdef CONFIG_IPV6_PRIVACY
1996 read_lock_bh(&in6_dev->lock);
1997 /* update all temporary addresses in the list */
1998 list_for_each_entry(ift, &in6_dev->tempaddr_list, tmp_list) {
2000 * When adjusting the lifetimes of an existing
2001 * temporary address, only lower the lifetimes.
2002 * Implementations must not increase the
2003 * lifetimes of an existing temporary address
2004 * when processing a Prefix Information Option.
2006 if (ifp != ift->ifpub)
2009 spin_lock(&ift->lock);
2011 if (ift->valid_lft > valid_lft &&
2012 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
2013 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
2014 if (ift->prefered_lft > prefered_lft &&
2015 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
2016 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
2017 spin_unlock(&ift->lock);
2018 if (!(flags&IFA_F_TENTATIVE))
2019 ipv6_ifa_notify(0, ift);
2022 if (create && in6_dev->cnf.use_tempaddr > 0) {
2024 * When a new public address is created as described in [ADDRCONF],
2025 * also create a new temporary address.
2027 read_unlock_bh(&in6_dev->lock);
2028 ipv6_create_tempaddr(ifp, NULL);
2030 read_unlock_bh(&in6_dev->lock);
2037 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2038 in6_dev_put(in6_dev);
2042 * Set destination address.
2043 * Special case for SIT interfaces where we create a new "virtual"
2046 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2048 struct in6_ifreq ireq;
2049 struct net_device *dev;
2055 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2058 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2064 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2065 if (dev->type == ARPHRD_SIT) {
2066 const struct net_device_ops *ops = dev->netdev_ops;
2068 struct ip_tunnel_parm p;
2070 err = -EADDRNOTAVAIL;
2071 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2074 memset(&p, 0, sizeof(p));
2075 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2079 p.iph.protocol = IPPROTO_IPV6;
2081 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2083 if (ops->ndo_do_ioctl) {
2084 mm_segment_t oldfs = get_fs();
2087 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2094 dev = __dev_get_by_name(net, p.name);
2097 err = dev_open(dev);
2108 * Manual configuration of address on an interface
2110 static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx,
2111 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2114 struct inet6_ifaddr *ifp;
2115 struct inet6_dev *idev;
2116 struct net_device *dev;
2120 unsigned long timeout;
2127 /* check the lifetime */
2128 if (!valid_lft || prefered_lft > valid_lft)
2131 dev = __dev_get_by_index(net, ifindex);
2135 if ((idev = addrconf_add_dev(dev)) == NULL)
2138 scope = ipv6_addr_scope(pfx);
2140 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2141 if (addrconf_finite_timeout(timeout)) {
2142 expires = jiffies_to_clock_t(timeout * HZ);
2143 valid_lft = timeout;
2144 flags = RTF_EXPIRES;
2148 ifa_flags |= IFA_F_PERMANENT;
2151 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2152 if (addrconf_finite_timeout(timeout)) {
2154 ifa_flags |= IFA_F_DEPRECATED;
2155 prefered_lft = timeout;
2158 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2161 spin_lock_bh(&ifp->lock);
2162 ifp->valid_lft = valid_lft;
2163 ifp->prefered_lft = prefered_lft;
2164 ifp->tstamp = jiffies;
2165 spin_unlock_bh(&ifp->lock);
2167 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2170 * Note that section 3.1 of RFC 4429 indicates
2171 * that the Optimistic flag should not be set for
2172 * manually configured addresses
2174 addrconf_dad_start(ifp, 0);
2180 return PTR_ERR(ifp);
2183 static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx,
2186 struct inet6_ifaddr *ifp;
2187 struct inet6_dev *idev;
2188 struct net_device *dev;
2193 dev = __dev_get_by_index(net, ifindex);
2197 if ((idev = __in6_dev_get(dev)) == NULL)
2200 read_lock_bh(&idev->lock);
2201 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2202 if (ifp->prefix_len == plen &&
2203 ipv6_addr_equal(pfx, &ifp->addr)) {
2205 read_unlock_bh(&idev->lock);
2209 /* If the last address is deleted administratively,
2210 disable IPv6 on this interface.
2212 if (list_empty(&idev->addr_list))
2213 addrconf_ifdown(idev->dev, 1);
2217 read_unlock_bh(&idev->lock);
2218 return -EADDRNOTAVAIL;
2222 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2224 struct in6_ifreq ireq;
2227 if (!capable(CAP_NET_ADMIN))
2230 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2234 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2235 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2236 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2241 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2243 struct in6_ifreq ireq;
2246 if (!capable(CAP_NET_ADMIN))
2249 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2253 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2254 ireq.ifr6_prefixlen);
2259 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2260 int plen, int scope)
2262 struct inet6_ifaddr *ifp;
2264 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2266 spin_lock_bh(&ifp->lock);
2267 ifp->flags &= ~IFA_F_TENTATIVE;
2268 spin_unlock_bh(&ifp->lock);
2269 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2274 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2275 static void sit_add_v4_addrs(struct inet6_dev *idev)
2277 struct in6_addr addr;
2278 struct net_device *dev;
2279 struct net *net = dev_net(idev->dev);
2284 memset(&addr, 0, sizeof(struct in6_addr));
2285 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2287 if (idev->dev->flags&IFF_POINTOPOINT) {
2288 addr.s6_addr32[0] = htonl(0xfe800000);
2291 scope = IPV6_ADDR_COMPATv4;
2294 if (addr.s6_addr32[3]) {
2295 add_addr(idev, &addr, 128, scope);
2299 for_each_netdev(net, dev) {
2300 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2301 if (in_dev && (dev->flags & IFF_UP)) {
2302 struct in_ifaddr * ifa;
2306 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2309 addr.s6_addr32[3] = ifa->ifa_local;
2311 if (ifa->ifa_scope == RT_SCOPE_LINK)
2313 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2314 if (idev->dev->flags&IFF_POINTOPOINT)
2318 if (idev->dev->flags&IFF_POINTOPOINT)
2323 add_addr(idev, &addr, plen, flag);
2330 static void init_loopback(struct net_device *dev)
2332 struct inet6_dev *idev;
2338 if ((idev = ipv6_find_idev(dev)) == NULL) {
2339 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2343 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2346 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2348 struct inet6_ifaddr * ifp;
2349 u32 addr_flags = IFA_F_PERMANENT;
2351 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2352 if (idev->cnf.optimistic_dad &&
2353 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2354 addr_flags |= IFA_F_OPTIMISTIC;
2358 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2360 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2361 addrconf_dad_start(ifp, 0);
2366 static void addrconf_dev_config(struct net_device *dev)
2368 struct in6_addr addr;
2369 struct inet6_dev * idev;
2373 if ((dev->type != ARPHRD_ETHER) &&
2374 (dev->type != ARPHRD_FDDI) &&
2375 (dev->type != ARPHRD_IEEE802_TR) &&
2376 (dev->type != ARPHRD_ARCNET) &&
2377 (dev->type != ARPHRD_INFINIBAND)) {
2378 /* Alas, we support only Ethernet autoconfiguration. */
2382 idev = addrconf_add_dev(dev);
2386 memset(&addr, 0, sizeof(struct in6_addr));
2387 addr.s6_addr32[0] = htonl(0xFE800000);
2389 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2390 addrconf_add_linklocal(idev, &addr);
2393 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2394 static void addrconf_sit_config(struct net_device *dev)
2396 struct inet6_dev *idev;
2401 * Configure the tunnel with one of our IPv4
2402 * addresses... we should configure all of
2403 * our v4 addrs in the tunnel
2406 if ((idev = ipv6_find_idev(dev)) == NULL) {
2407 printk(KERN_DEBUG "init sit: add_dev failed\n");
2411 if (dev->priv_flags & IFF_ISATAP) {
2412 struct in6_addr addr;
2414 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2415 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2416 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2417 addrconf_add_linklocal(idev, &addr);
2421 sit_add_v4_addrs(idev);
2423 if (dev->flags&IFF_POINTOPOINT) {
2424 addrconf_add_mroute(dev);
2425 addrconf_add_lroute(dev);
2432 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2434 struct in6_addr lladdr;
2436 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2437 addrconf_add_linklocal(idev, &lladdr);
2443 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2445 struct net_device *link_dev;
2446 struct net *net = dev_net(idev->dev);
2448 /* first try to inherit the link-local address from the link device */
2449 if (idev->dev->iflink &&
2450 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2451 if (!ipv6_inherit_linklocal(idev, link_dev))
2454 /* then try to inherit it from any device */
2455 for_each_netdev(net, link_dev) {
2456 if (!ipv6_inherit_linklocal(idev, link_dev))
2459 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2463 * Autoconfigure tunnel with a link-local address so routing protocols,
2464 * DHCPv6, MLD etc. can be run over the virtual link
2467 static void addrconf_ip6_tnl_config(struct net_device *dev)
2469 struct inet6_dev *idev;
2473 idev = addrconf_add_dev(dev);
2475 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2478 ip6_tnl_add_linklocal(idev);
2481 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2484 struct net_device *dev = (struct net_device *) data;
2485 struct inet6_dev *idev = __in6_dev_get(dev);
2486 int run_pending = 0;
2490 case NETDEV_REGISTER:
2491 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2492 idev = ipv6_add_dev(dev);
2494 return notifier_from_errno(-ENOMEM);
2500 if (dev->flags & IFF_SLAVE)
2503 if (event == NETDEV_UP) {
2504 if (!addrconf_qdisc_ok(dev)) {
2505 /* device is not ready yet. */
2507 "ADDRCONF(NETDEV_UP): %s: "
2508 "link is not ready\n",
2513 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2514 idev = ipv6_add_dev(dev);
2517 idev->if_flags |= IF_READY;
2521 if (!addrconf_qdisc_ok(dev)) {
2522 /* device is still not ready. */
2527 if (idev->if_flags & IF_READY)
2528 /* device is already configured. */
2530 idev->if_flags |= IF_READY;
2534 "ADDRCONF(NETDEV_CHANGE): %s: "
2535 "link becomes ready\n",
2541 switch (dev->type) {
2542 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2544 addrconf_sit_config(dev);
2547 case ARPHRD_TUNNEL6:
2548 addrconf_ip6_tnl_config(dev);
2550 case ARPHRD_LOOPBACK:
2555 addrconf_dev_config(dev);
2561 addrconf_dad_run(idev);
2564 * If the MTU changed during the interface down,
2565 * when the interface up, the changed MTU must be
2566 * reflected in the idev as well as routers.
2568 if (idev->cnf.mtu6 != dev->mtu &&
2569 dev->mtu >= IPV6_MIN_MTU) {
2570 rt6_mtu_change(dev, dev->mtu);
2571 idev->cnf.mtu6 = dev->mtu;
2573 idev->tstamp = jiffies;
2574 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2577 * If the changed mtu during down is lower than
2578 * IPV6_MIN_MTU stop IPv6 on this interface.
2580 if (dev->mtu < IPV6_MIN_MTU)
2581 addrconf_ifdown(dev, 1);
2585 case NETDEV_CHANGEMTU:
2586 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2587 rt6_mtu_change(dev, dev->mtu);
2588 idev->cnf.mtu6 = dev->mtu;
2592 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2593 idev = ipv6_add_dev(dev);
2599 * MTU falled under IPV6_MIN_MTU.
2600 * Stop IPv6 on this interface.
2604 case NETDEV_UNREGISTER:
2606 * Remove all addresses from this interface.
2608 addrconf_ifdown(dev, event != NETDEV_DOWN);
2611 case NETDEV_CHANGENAME:
2613 snmp6_unregister_dev(idev);
2614 addrconf_sysctl_unregister(idev);
2615 addrconf_sysctl_register(idev);
2616 err = snmp6_register_dev(idev);
2618 return notifier_from_errno(err);
2622 case NETDEV_PRE_TYPE_CHANGE:
2623 case NETDEV_POST_TYPE_CHANGE:
2624 addrconf_type_change(dev, event);
2632 * addrconf module should be notified of a device going up
2634 static struct notifier_block ipv6_dev_notf = {
2635 .notifier_call = addrconf_notify,
2638 static void addrconf_type_change(struct net_device *dev, unsigned long event)
2640 struct inet6_dev *idev;
2643 idev = __in6_dev_get(dev);
2645 if (event == NETDEV_POST_TYPE_CHANGE)
2646 ipv6_mc_remap(idev);
2647 else if (event == NETDEV_PRE_TYPE_CHANGE)
2648 ipv6_mc_unmap(idev);
2651 static int addrconf_ifdown(struct net_device *dev, int how)
2653 struct net *net = dev_net(dev);
2654 struct inet6_dev *idev;
2655 struct inet6_ifaddr *ifa;
2656 LIST_HEAD(keep_list);
2661 rt6_ifdown(net, dev);
2662 neigh_ifdown(&nd_tbl, dev);
2664 idev = __in6_dev_get(dev);
2669 * Step 1: remove reference to ipv6 device from parent device.
2675 /* protected by rtnl_lock */
2676 rcu_assign_pointer(dev->ip6_ptr, NULL);
2678 /* Step 1.5: remove snmp6 entry */
2679 snmp6_unregister_dev(idev);
2683 write_lock_bh(&idev->lock);
2685 /* Step 2: clear flags for stateless addrconf */
2687 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2689 #ifdef CONFIG_IPV6_PRIVACY
2690 if (how && del_timer(&idev->regen_timer))
2693 /* Step 3: clear tempaddr list */
2694 while (!list_empty(&idev->tempaddr_list)) {
2695 ifa = list_first_entry(&idev->tempaddr_list,
2696 struct inet6_ifaddr, tmp_list);
2697 list_del(&ifa->tmp_list);
2698 write_unlock_bh(&idev->lock);
2699 spin_lock_bh(&ifa->lock);
2702 in6_ifa_put(ifa->ifpub);
2705 spin_unlock_bh(&ifa->lock);
2707 write_lock_bh(&idev->lock);
2711 while (!list_empty(&idev->addr_list)) {
2712 ifa = list_first_entry(&idev->addr_list,
2713 struct inet6_ifaddr, if_list);
2714 addrconf_del_timer(ifa);
2716 /* If just doing link down, and address is permanent
2717 and not link-local, then retain it. */
2719 (ifa->flags&IFA_F_PERMANENT) &&
2720 !(ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL)) {
2721 list_move_tail(&ifa->if_list, &keep_list);
2723 /* If not doing DAD on this address, just keep it. */
2724 if ((dev->flags&(IFF_NOARP|IFF_LOOPBACK)) ||
2725 idev->cnf.accept_dad <= 0 ||
2726 (ifa->flags & IFA_F_NODAD))
2729 /* If it was tentative already, no need to notify */
2730 if (ifa->flags & IFA_F_TENTATIVE)
2733 /* Flag it for later restoration when link comes up */
2734 ifa->flags |= IFA_F_TENTATIVE;
2735 ifa->state = INET6_IFADDR_STATE_DAD;
2737 write_unlock_bh(&idev->lock);
2741 list_del(&ifa->if_list);
2743 /* clear hash table */
2744 spin_lock_bh(&addrconf_hash_lock);
2745 hlist_del_init_rcu(&ifa->addr_lst);
2746 spin_unlock_bh(&addrconf_hash_lock);
2748 write_unlock_bh(&idev->lock);
2749 spin_lock_bh(&ifa->state_lock);
2751 ifa->state = INET6_IFADDR_STATE_DEAD;
2752 spin_unlock_bh(&ifa->state_lock);
2754 if (state == INET6_IFADDR_STATE_DEAD)
2758 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2759 if (ifa->state == INET6_IFADDR_STATE_DEAD)
2760 atomic_notifier_call_chain(&inet6addr_chain,
2766 write_lock_bh(&idev->lock);
2769 list_splice(&keep_list, &idev->addr_list);
2771 write_unlock_bh(&idev->lock);
2773 /* Step 5: Discard multicast list */
2775 ipv6_mc_destroy_dev(idev);
2779 idev->tstamp = jiffies;
2781 /* Last: Shot the device (if unregistered) */
2783 addrconf_sysctl_unregister(idev);
2784 neigh_parms_release(&nd_tbl, idev->nd_parms);
2785 neigh_ifdown(&nd_tbl, dev);
2791 static void addrconf_rs_timer(unsigned long data)
2793 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2794 struct inet6_dev *idev = ifp->idev;
2796 read_lock(&idev->lock);
2797 if (idev->dead || !(idev->if_flags & IF_READY))
2800 if (idev->cnf.forwarding)
2803 /* Announcement received after solicitation was sent */
2804 if (idev->if_flags & IF_RA_RCVD)
2807 spin_lock(&ifp->lock);
2808 if (ifp->probes++ < idev->cnf.rtr_solicits) {
2809 /* The wait after the last probe can be shorter */
2810 addrconf_mod_timer(ifp, AC_RS,
2811 (ifp->probes == idev->cnf.rtr_solicits) ?
2812 idev->cnf.rtr_solicit_delay :
2813 idev->cnf.rtr_solicit_interval);
2814 spin_unlock(&ifp->lock);
2816 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2818 spin_unlock(&ifp->lock);
2820 * Note: we do not support deprecated "all on-link"
2821 * assumption any longer.
2823 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2828 read_unlock(&idev->lock);
2833 * Duplicate Address Detection
2835 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2837 unsigned long rand_num;
2838 struct inet6_dev *idev = ifp->idev;
2840 if (ifp->flags & IFA_F_OPTIMISTIC)
2843 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2845 ifp->probes = idev->cnf.dad_transmits;
2846 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2849 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2851 struct inet6_dev *idev = ifp->idev;
2852 struct net_device *dev = idev->dev;
2854 addrconf_join_solict(dev, &ifp->addr);
2856 net_srandom(ifp->addr.s6_addr32[3]);
2858 read_lock_bh(&idev->lock);
2859 spin_lock(&ifp->lock);
2860 if (ifp->state == INET6_IFADDR_STATE_DEAD)
2863 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2864 idev->cnf.accept_dad < 1 ||
2865 !(ifp->flags&IFA_F_TENTATIVE) ||
2866 ifp->flags & IFA_F_NODAD) {
2867 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2868 spin_unlock(&ifp->lock);
2869 read_unlock_bh(&idev->lock);
2871 addrconf_dad_completed(ifp);
2875 if (!(idev->if_flags & IF_READY)) {
2876 spin_unlock(&ifp->lock);
2877 read_unlock_bh(&idev->lock);
2879 * If the device is not ready:
2880 * - keep it tentative if it is a permanent address.
2881 * - otherwise, kill it.
2884 addrconf_dad_stop(ifp, 0);
2889 * Optimistic nodes can start receiving
2892 if (ifp->flags & IFA_F_OPTIMISTIC)
2893 ip6_ins_rt(ifp->rt);
2895 addrconf_dad_kick(ifp);
2897 spin_unlock(&ifp->lock);
2898 read_unlock_bh(&idev->lock);
2901 static void addrconf_dad_timer(unsigned long data)
2903 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2904 struct inet6_dev *idev = ifp->idev;
2905 struct in6_addr mcaddr;
2907 if (!ifp->probes && addrconf_dad_end(ifp))
2910 read_lock(&idev->lock);
2911 if (idev->dead || !(idev->if_flags & IF_READY)) {
2912 read_unlock(&idev->lock);
2916 spin_lock(&ifp->lock);
2917 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
2918 spin_unlock(&ifp->lock);
2919 read_unlock(&idev->lock);
2923 if (ifp->probes == 0) {
2925 * DAD was successful
2928 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2929 spin_unlock(&ifp->lock);
2930 read_unlock(&idev->lock);
2932 addrconf_dad_completed(ifp);
2938 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2939 spin_unlock(&ifp->lock);
2940 read_unlock(&idev->lock);
2942 /* send a neighbour solicitation for our addr */
2943 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2944 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
2949 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2951 struct net_device *dev = ifp->idev->dev;
2954 * Configure the address for reception. Now it is valid.
2957 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2959 /* If added prefix is link local and forwarding is off,
2960 start sending router solicitations.
2963 if (ifp->idev->cnf.forwarding == 0 &&
2964 ifp->idev->cnf.rtr_solicits > 0 &&
2965 (dev->flags&IFF_LOOPBACK) == 0 &&
2966 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2968 * If a host as already performed a random delay
2969 * [...] as part of DAD [...] there is no need
2970 * to delay again before sending the first RS
2972 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2974 spin_lock_bh(&ifp->lock);
2976 ifp->idev->if_flags |= IF_RS_SENT;
2977 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2978 spin_unlock_bh(&ifp->lock);
2982 static void addrconf_dad_run(struct inet6_dev *idev)
2984 struct inet6_ifaddr *ifp;
2986 read_lock_bh(&idev->lock);
2987 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2988 spin_lock(&ifp->lock);
2989 if (ifp->flags & IFA_F_TENTATIVE &&
2990 ifp->state == INET6_IFADDR_STATE_DAD)
2991 addrconf_dad_kick(ifp);
2992 spin_unlock(&ifp->lock);
2994 read_unlock_bh(&idev->lock);
2997 #ifdef CONFIG_PROC_FS
2998 struct if6_iter_state {
2999 struct seq_net_private p;
3003 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
3005 struct inet6_ifaddr *ifa = NULL;
3006 struct if6_iter_state *state = seq->private;
3007 struct net *net = seq_file_net(seq);
3009 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3010 struct hlist_node *n;
3011 hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket],
3013 if (net_eq(dev_net(ifa->idev->dev), net))
3019 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3020 struct inet6_ifaddr *ifa)
3022 struct if6_iter_state *state = seq->private;
3023 struct net *net = seq_file_net(seq);
3024 struct hlist_node *n = &ifa->addr_lst;
3026 hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst)
3027 if (net_eq(dev_net(ifa->idev->dev), net))
3030 while (++state->bucket < IN6_ADDR_HSIZE) {
3031 hlist_for_each_entry_rcu_bh(ifa, n,
3032 &inet6_addr_lst[state->bucket], addr_lst) {
3033 if (net_eq(dev_net(ifa->idev->dev), net))
3041 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
3043 struct inet6_ifaddr *ifa = if6_get_first(seq);
3046 while (pos && (ifa = if6_get_next(seq, ifa)) != NULL)
3048 return pos ? NULL : ifa;
3051 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3055 return if6_get_idx(seq, *pos);
3058 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3060 struct inet6_ifaddr *ifa;
3062 ifa = if6_get_next(seq, v);
3067 static void if6_seq_stop(struct seq_file *seq, void *v)
3070 rcu_read_unlock_bh();
3073 static int if6_seq_show(struct seq_file *seq, void *v)
3075 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3076 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3078 ifp->idev->dev->ifindex,
3082 ifp->idev->dev->name);
3086 static const struct seq_operations if6_seq_ops = {
3087 .start = if6_seq_start,
3088 .next = if6_seq_next,
3089 .show = if6_seq_show,
3090 .stop = if6_seq_stop,
3093 static int if6_seq_open(struct inode *inode, struct file *file)
3095 return seq_open_net(inode, file, &if6_seq_ops,
3096 sizeof(struct if6_iter_state));
3099 static const struct file_operations if6_fops = {
3100 .owner = THIS_MODULE,
3101 .open = if6_seq_open,
3103 .llseek = seq_lseek,
3104 .release = seq_release_net,
3107 static int __net_init if6_proc_net_init(struct net *net)
3109 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
3114 static void __net_exit if6_proc_net_exit(struct net *net)
3116 proc_net_remove(net, "if_inet6");
3119 static struct pernet_operations if6_proc_net_ops = {
3120 .init = if6_proc_net_init,
3121 .exit = if6_proc_net_exit,
3124 int __init if6_proc_init(void)
3126 return register_pernet_subsys(&if6_proc_net_ops);
3129 void if6_proc_exit(void)
3131 unregister_pernet_subsys(&if6_proc_net_ops);
3133 #endif /* CONFIG_PROC_FS */
3135 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3136 /* Check if address is a home address configured on any interface. */
3137 int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
3140 struct inet6_ifaddr *ifp = NULL;
3141 struct hlist_node *n;
3142 unsigned int hash = ipv6_addr_hash(addr);
3145 hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) {
3146 if (!net_eq(dev_net(ifp->idev->dev), net))
3148 if (ipv6_addr_equal(&ifp->addr, addr) &&
3149 (ifp->flags & IFA_F_HOMEADDRESS)) {
3154 rcu_read_unlock_bh();
3160 * Periodic address status verification
3163 static void addrconf_verify(unsigned long foo)
3165 unsigned long now, next, next_sec, next_sched;
3166 struct inet6_ifaddr *ifp;
3167 struct hlist_node *node;
3171 spin_lock(&addrconf_verify_lock);
3173 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3175 del_timer(&addr_chk_timer);
3177 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3179 hlist_for_each_entry_rcu_bh(ifp, node,
3180 &inet6_addr_lst[i], addr_lst) {
3183 if (ifp->flags & IFA_F_PERMANENT)
3186 spin_lock(&ifp->lock);
3187 /* We try to batch several events at once. */
3188 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3190 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3191 age >= ifp->valid_lft) {
3192 spin_unlock(&ifp->lock);
3196 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3197 spin_unlock(&ifp->lock);
3199 } else if (age >= ifp->prefered_lft) {
3200 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3203 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3205 ifp->flags |= IFA_F_DEPRECATED;
3208 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3209 next = ifp->tstamp + ifp->valid_lft * HZ;
3211 spin_unlock(&ifp->lock);
3216 ipv6_ifa_notify(0, ifp);
3220 #ifdef CONFIG_IPV6_PRIVACY
3221 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3222 !(ifp->flags&IFA_F_TENTATIVE)) {
3223 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3224 ifp->idev->cnf.dad_transmits *
3225 ifp->idev->nd_parms->retrans_time / HZ;
3227 if (age >= ifp->prefered_lft - regen_advance) {
3228 struct inet6_ifaddr *ifpub = ifp->ifpub;
3229 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3230 next = ifp->tstamp + ifp->prefered_lft * HZ;
3231 if (!ifp->regen_count && ifpub) {
3234 in6_ifa_hold(ifpub);
3235 spin_unlock(&ifp->lock);
3237 spin_lock(&ifpub->lock);
3238 ifpub->regen_count = 0;
3239 spin_unlock(&ifpub->lock);
3240 ipv6_create_tempaddr(ifpub, ifp);
3245 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3246 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3247 spin_unlock(&ifp->lock);
3250 /* ifp->prefered_lft <= ifp->valid_lft */
3251 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3252 next = ifp->tstamp + ifp->prefered_lft * HZ;
3253 spin_unlock(&ifp->lock);
3258 next_sec = round_jiffies_up(next);
3261 /* If rounded timeout is accurate enough, accept it. */
3262 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3263 next_sched = next_sec;
3265 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3266 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3267 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3269 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3270 now, next, next_sec, next_sched));
3272 addr_chk_timer.expires = next_sched;
3273 add_timer(&addr_chk_timer);
3274 spin_unlock(&addrconf_verify_lock);
3275 rcu_read_unlock_bh();
3278 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3280 struct in6_addr *pfx = NULL;
3283 pfx = nla_data(addr);
3286 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3289 pfx = nla_data(local);
3295 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3296 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3297 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3298 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3302 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3304 struct net *net = sock_net(skb->sk);
3305 struct ifaddrmsg *ifm;
3306 struct nlattr *tb[IFA_MAX+1];
3307 struct in6_addr *pfx;
3310 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3314 ifm = nlmsg_data(nlh);
3315 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3319 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3322 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3323 u32 prefered_lft, u32 valid_lft)
3327 unsigned long timeout;
3329 if (!valid_lft || (prefered_lft > valid_lft))
3332 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3333 if (addrconf_finite_timeout(timeout)) {
3334 expires = jiffies_to_clock_t(timeout * HZ);
3335 valid_lft = timeout;
3336 flags = RTF_EXPIRES;
3340 ifa_flags |= IFA_F_PERMANENT;
3343 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3344 if (addrconf_finite_timeout(timeout)) {
3346 ifa_flags |= IFA_F_DEPRECATED;
3347 prefered_lft = timeout;
3350 spin_lock_bh(&ifp->lock);
3351 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3352 ifp->tstamp = jiffies;
3353 ifp->valid_lft = valid_lft;
3354 ifp->prefered_lft = prefered_lft;
3356 spin_unlock_bh(&ifp->lock);
3357 if (!(ifp->flags&IFA_F_TENTATIVE))
3358 ipv6_ifa_notify(0, ifp);
3360 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3368 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3370 struct net *net = sock_net(skb->sk);
3371 struct ifaddrmsg *ifm;
3372 struct nlattr *tb[IFA_MAX+1];
3373 struct in6_addr *pfx;
3374 struct inet6_ifaddr *ifa;
3375 struct net_device *dev;
3376 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3380 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3384 ifm = nlmsg_data(nlh);
3385 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3389 if (tb[IFA_CACHEINFO]) {
3390 struct ifa_cacheinfo *ci;
3392 ci = nla_data(tb[IFA_CACHEINFO]);
3393 valid_lft = ci->ifa_valid;
3394 preferred_lft = ci->ifa_prefered;
3396 preferred_lft = INFINITY_LIFE_TIME;
3397 valid_lft = INFINITY_LIFE_TIME;
3400 dev = __dev_get_by_index(net, ifm->ifa_index);
3404 /* We ignore other flags so far. */
3405 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3407 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3410 * It would be best to check for !NLM_F_CREATE here but
3411 * userspace alreay relies on not having to provide this.
3413 return inet6_addr_add(net, ifm->ifa_index, pfx,
3414 ifm->ifa_prefixlen, ifa_flags,
3415 preferred_lft, valid_lft);
3418 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3419 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3422 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3429 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3430 u8 scope, int ifindex)
3432 struct ifaddrmsg *ifm;
3434 ifm = nlmsg_data(nlh);
3435 ifm->ifa_family = AF_INET6;
3436 ifm->ifa_prefixlen = prefixlen;
3437 ifm->ifa_flags = flags;
3438 ifm->ifa_scope = scope;
3439 ifm->ifa_index = ifindex;
3442 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3443 unsigned long tstamp, u32 preferred, u32 valid)
3445 struct ifa_cacheinfo ci;
3447 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3448 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3449 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3450 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3451 ci.ifa_prefered = preferred;
3452 ci.ifa_valid = valid;
3454 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3457 static inline int rt_scope(int ifa_scope)
3459 if (ifa_scope & IFA_HOST)
3460 return RT_SCOPE_HOST;
3461 else if (ifa_scope & IFA_LINK)
3462 return RT_SCOPE_LINK;
3463 else if (ifa_scope & IFA_SITE)
3464 return RT_SCOPE_SITE;
3466 return RT_SCOPE_UNIVERSE;
3469 static inline int inet6_ifaddr_msgsize(void)
3471 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3472 + nla_total_size(16) /* IFA_ADDRESS */
3473 + nla_total_size(sizeof(struct ifa_cacheinfo));
3476 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3477 u32 pid, u32 seq, int event, unsigned int flags)
3479 struct nlmsghdr *nlh;
3480 u32 preferred, valid;
3482 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3486 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3487 ifa->idev->dev->ifindex);
3489 if (!(ifa->flags&IFA_F_PERMANENT)) {
3490 preferred = ifa->prefered_lft;
3491 valid = ifa->valid_lft;
3492 if (preferred != INFINITY_LIFE_TIME) {
3493 long tval = (jiffies - ifa->tstamp)/HZ;
3494 if (preferred > tval)
3498 if (valid != INFINITY_LIFE_TIME)
3502 preferred = INFINITY_LIFE_TIME;
3503 valid = INFINITY_LIFE_TIME;
3506 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3507 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3508 nlmsg_cancel(skb, nlh);
3512 return nlmsg_end(skb, nlh);
3515 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3516 u32 pid, u32 seq, int event, u16 flags)
3518 struct nlmsghdr *nlh;
3519 u8 scope = RT_SCOPE_UNIVERSE;
3520 int ifindex = ifmca->idev->dev->ifindex;
3522 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3523 scope = RT_SCOPE_SITE;
3525 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3529 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3530 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3531 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3532 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3533 nlmsg_cancel(skb, nlh);
3537 return nlmsg_end(skb, nlh);
3540 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3541 u32 pid, u32 seq, int event, unsigned int flags)
3543 struct nlmsghdr *nlh;
3544 u8 scope = RT_SCOPE_UNIVERSE;
3545 int ifindex = ifaca->aca_idev->dev->ifindex;
3547 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3548 scope = RT_SCOPE_SITE;
3550 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3554 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3555 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3556 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3557 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3558 nlmsg_cancel(skb, nlh);
3562 return nlmsg_end(skb, nlh);
3571 /* called with rcu_read_lock() */
3572 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3573 struct netlink_callback *cb, enum addr_type_t type,
3574 int s_ip_idx, int *p_ip_idx)
3576 struct ifmcaddr6 *ifmca;
3577 struct ifacaddr6 *ifaca;
3579 int ip_idx = *p_ip_idx;
3581 read_lock_bh(&idev->lock);
3583 case UNICAST_ADDR: {
3584 struct inet6_ifaddr *ifa;
3586 /* unicast address incl. temp addr */
3587 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3588 if (++ip_idx < s_ip_idx)
3590 err = inet6_fill_ifaddr(skb, ifa,
3591 NETLINK_CB(cb->skb).pid,
3600 case MULTICAST_ADDR:
3601 /* multicast address */
3602 for (ifmca = idev->mc_list; ifmca;
3603 ifmca = ifmca->next, ip_idx++) {
3604 if (ip_idx < s_ip_idx)
3606 err = inet6_fill_ifmcaddr(skb, ifmca,
3607 NETLINK_CB(cb->skb).pid,
3616 /* anycast address */
3617 for (ifaca = idev->ac_list; ifaca;
3618 ifaca = ifaca->aca_next, ip_idx++) {
3619 if (ip_idx < s_ip_idx)
3621 err = inet6_fill_ifacaddr(skb, ifaca,
3622 NETLINK_CB(cb->skb).pid,
3633 read_unlock_bh(&idev->lock);
3638 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3639 enum addr_type_t type)
3641 struct net *net = sock_net(skb->sk);
3644 int s_idx, s_ip_idx;
3645 struct net_device *dev;
3646 struct inet6_dev *idev;
3647 struct hlist_head *head;
3648 struct hlist_node *node;
3651 s_idx = idx = cb->args[1];
3652 s_ip_idx = ip_idx = cb->args[2];
3655 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3657 head = &net->dev_index_head[h];
3658 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3661 if (h > s_h || idx > s_idx)
3664 idev = __in6_dev_get(dev);
3668 if (in6_dump_addrs(idev, skb, cb, type,
3669 s_ip_idx, &ip_idx) <= 0)
3679 cb->args[2] = ip_idx;
3684 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3686 enum addr_type_t type = UNICAST_ADDR;
3688 return inet6_dump_addr(skb, cb, type);
3691 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3693 enum addr_type_t type = MULTICAST_ADDR;
3695 return inet6_dump_addr(skb, cb, type);
3699 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3701 enum addr_type_t type = ANYCAST_ADDR;
3703 return inet6_dump_addr(skb, cb, type);
3706 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3709 struct net *net = sock_net(in_skb->sk);
3710 struct ifaddrmsg *ifm;
3711 struct nlattr *tb[IFA_MAX+1];
3712 struct in6_addr *addr = NULL;
3713 struct net_device *dev = NULL;
3714 struct inet6_ifaddr *ifa;
3715 struct sk_buff *skb;
3718 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3722 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3728 ifm = nlmsg_data(nlh);
3730 dev = __dev_get_by_index(net, ifm->ifa_index);
3732 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
3734 err = -EADDRNOTAVAIL;
3738 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
3744 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3745 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3747 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3748 WARN_ON(err == -EMSGSIZE);
3752 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
3759 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3761 struct sk_buff *skb;
3762 struct net *net = dev_net(ifa->idev->dev);
3765 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3769 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3771 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3772 WARN_ON(err == -EMSGSIZE);
3776 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3780 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3783 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3784 __s32 *array, int bytes)
3786 BUG_ON(bytes < (DEVCONF_MAX * 4));
3788 memset(array, 0, bytes);
3789 array[DEVCONF_FORWARDING] = cnf->forwarding;
3790 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3791 array[DEVCONF_MTU6] = cnf->mtu6;
3792 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3793 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3794 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3795 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3796 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3797 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3798 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3799 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3800 #ifdef CONFIG_IPV6_PRIVACY
3801 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3802 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3803 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3804 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3805 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3807 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3808 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3809 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3810 #ifdef CONFIG_IPV6_ROUTER_PREF
3811 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3812 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3813 #ifdef CONFIG_IPV6_ROUTE_INFO
3814 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3817 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3818 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3819 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3820 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3822 #ifdef CONFIG_IPV6_MROUTE
3823 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3825 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
3826 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
3827 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
3830 static inline size_t inet6_if_nlmsg_size(void)
3832 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3833 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3834 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3835 + nla_total_size(4) /* IFLA_MTU */
3836 + nla_total_size(4) /* IFLA_LINK */
3837 + nla_total_size( /* IFLA_PROTINFO */
3838 nla_total_size(4) /* IFLA_INET6_FLAGS */
3839 + nla_total_size(sizeof(struct ifla_cacheinfo))
3840 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3841 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3842 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
3846 static inline void __snmp6_fill_stats(u64 *stats, void __percpu **mib,
3847 int items, int bytes)
3850 int pad = bytes - sizeof(u64) * items;
3853 /* Use put_unaligned() because stats may not be aligned for u64. */
3854 put_unaligned(items, &stats[0]);
3855 for (i = 1; i < items; i++)
3856 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3858 memset(&stats[items], 0, pad);
3861 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3865 case IFLA_INET6_STATS:
3866 __snmp6_fill_stats(stats, (void __percpu **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3868 case IFLA_INET6_ICMP6STATS:
3869 __snmp6_fill_stats(stats, (void __percpu **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3874 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3875 u32 pid, u32 seq, int event, unsigned int flags)
3877 struct net_device *dev = idev->dev;
3879 struct ifinfomsg *hdr;
3880 struct nlmsghdr *nlh;
3882 struct ifla_cacheinfo ci;
3884 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3888 hdr = nlmsg_data(nlh);
3889 hdr->ifi_family = AF_INET6;
3891 hdr->ifi_type = dev->type;
3892 hdr->ifi_index = dev->ifindex;
3893 hdr->ifi_flags = dev_get_flags(dev);
3894 hdr->ifi_change = 0;
3896 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3899 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3901 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3902 if (dev->ifindex != dev->iflink)
3903 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3905 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3906 if (protoinfo == NULL)
3907 goto nla_put_failure;
3909 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3911 ci.max_reasm_len = IPV6_MAXPLEN;
3912 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3913 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3914 ci.reachable_time = idev->nd_parms->reachable_time;
3915 ci.retrans_time = idev->nd_parms->retrans_time;
3916 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3918 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3920 goto nla_put_failure;
3921 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3923 /* XXX - MC not implemented */
3925 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3927 goto nla_put_failure;
3928 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3930 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3932 goto nla_put_failure;
3933 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3935 nla_nest_end(skb, protoinfo);
3936 return nlmsg_end(skb, nlh);
3939 nlmsg_cancel(skb, nlh);
3943 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3945 struct net *net = sock_net(skb->sk);
3948 struct net_device *dev;
3949 struct inet6_dev *idev;
3950 struct hlist_head *head;
3951 struct hlist_node *node;
3954 s_idx = cb->args[1];
3957 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3959 head = &net->dev_index_head[h];
3960 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3963 idev = __in6_dev_get(dev);
3966 if (inet6_fill_ifinfo(skb, idev,
3967 NETLINK_CB(cb->skb).pid,
3969 RTM_NEWLINK, NLM_F_MULTI) <= 0)
3983 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3985 struct sk_buff *skb;
3986 struct net *net = dev_net(idev->dev);
3989 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
3993 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
3995 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3996 WARN_ON(err == -EMSGSIZE);
4000 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4004 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4007 static inline size_t inet6_prefix_nlmsg_size(void)
4009 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4010 + nla_total_size(sizeof(struct in6_addr))
4011 + nla_total_size(sizeof(struct prefix_cacheinfo));
4014 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4015 struct prefix_info *pinfo, u32 pid, u32 seq,
4016 int event, unsigned int flags)
4018 struct prefixmsg *pmsg;
4019 struct nlmsghdr *nlh;
4020 struct prefix_cacheinfo ci;
4022 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
4026 pmsg = nlmsg_data(nlh);
4027 pmsg->prefix_family = AF_INET6;
4028 pmsg->prefix_pad1 = 0;
4029 pmsg->prefix_pad2 = 0;
4030 pmsg->prefix_ifindex = idev->dev->ifindex;
4031 pmsg->prefix_len = pinfo->prefix_len;
4032 pmsg->prefix_type = pinfo->type;
4033 pmsg->prefix_pad3 = 0;
4034 pmsg->prefix_flags = 0;
4036 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4037 if (pinfo->autoconf)
4038 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4040 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
4042 ci.preferred_time = ntohl(pinfo->prefered);
4043 ci.valid_time = ntohl(pinfo->valid);
4044 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
4046 return nlmsg_end(skb, nlh);
4049 nlmsg_cancel(skb, nlh);
4053 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4054 struct prefix_info *pinfo)
4056 struct sk_buff *skb;
4057 struct net *net = dev_net(idev->dev);
4060 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4064 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4066 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4067 WARN_ON(err == -EMSGSIZE);
4071 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4075 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4078 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4080 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4085 * If the address was optimistic
4086 * we inserted the route at the start of
4087 * our DAD process, so we don't need
4090 if (!(ifp->rt->rt6i_node))
4091 ip6_ins_rt(ifp->rt);
4092 if (ifp->idev->cnf.forwarding)
4093 addrconf_join_anycast(ifp);
4096 if (ifp->idev->cnf.forwarding)
4097 addrconf_leave_anycast(ifp);
4098 addrconf_leave_solict(ifp->idev, &ifp->addr);
4099 dst_hold(&ifp->rt->dst);
4101 if (ifp->state == INET6_IFADDR_STATE_DEAD &&
4102 ip6_del_rt(ifp->rt))
4103 dst_free(&ifp->rt->dst);
4108 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4111 if (likely(ifp->idev->dead == 0))
4112 __ipv6_ifa_notify(event, ifp);
4113 rcu_read_unlock_bh();
4116 #ifdef CONFIG_SYSCTL
4119 int addrconf_sysctl_forward(ctl_table *ctl, int write,
4120 void __user *buffer, size_t *lenp, loff_t *ppos)
4122 int *valp = ctl->data;
4127 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4130 ret = addrconf_fixup_forwarding(ctl, valp, val);
4136 static void dev_disable_change(struct inet6_dev *idev)
4138 if (!idev || !idev->dev)
4141 if (idev->cnf.disable_ipv6)
4142 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4144 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4147 static void addrconf_disable_change(struct net *net, __s32 newf)
4149 struct net_device *dev;
4150 struct inet6_dev *idev;
4153 for_each_netdev_rcu(net, dev) {
4154 idev = __in6_dev_get(dev);
4156 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4157 idev->cnf.disable_ipv6 = newf;
4159 dev_disable_change(idev);
4165 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int old)
4169 net = (struct net *)table->extra2;
4171 if (p == &net->ipv6.devconf_dflt->disable_ipv6)
4174 if (!rtnl_trylock()) {
4175 /* Restore the original values before restarting */
4177 return restart_syscall();
4180 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4181 __s32 newf = net->ipv6.devconf_all->disable_ipv6;
4182 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4183 addrconf_disable_change(net, newf);
4184 } else if ((!*p) ^ (!old))
4185 dev_disable_change((struct inet6_dev *)table->extra1);
4192 int addrconf_sysctl_disable(ctl_table *ctl, int write,
4193 void __user *buffer, size_t *lenp, loff_t *ppos)
4195 int *valp = ctl->data;
4200 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4203 ret = addrconf_disable_ipv6(ctl, valp, val);
4209 static struct addrconf_sysctl_table
4211 struct ctl_table_header *sysctl_header;
4212 ctl_table addrconf_vars[DEVCONF_MAX+1];
4214 } addrconf_sysctl __read_mostly = {
4215 .sysctl_header = NULL,
4218 .procname = "forwarding",
4219 .data = &ipv6_devconf.forwarding,
4220 .maxlen = sizeof(int),
4222 .proc_handler = addrconf_sysctl_forward,
4225 .procname = "hop_limit",
4226 .data = &ipv6_devconf.hop_limit,
4227 .maxlen = sizeof(int),
4229 .proc_handler = proc_dointvec,
4233 .data = &ipv6_devconf.mtu6,
4234 .maxlen = sizeof(int),
4236 .proc_handler = proc_dointvec,
4239 .procname = "accept_ra",
4240 .data = &ipv6_devconf.accept_ra,
4241 .maxlen = sizeof(int),
4243 .proc_handler = proc_dointvec,
4246 .procname = "accept_redirects",
4247 .data = &ipv6_devconf.accept_redirects,
4248 .maxlen = sizeof(int),
4250 .proc_handler = proc_dointvec,
4253 .procname = "autoconf",
4254 .data = &ipv6_devconf.autoconf,
4255 .maxlen = sizeof(int),
4257 .proc_handler = proc_dointvec,
4260 .procname = "dad_transmits",
4261 .data = &ipv6_devconf.dad_transmits,
4262 .maxlen = sizeof(int),
4264 .proc_handler = proc_dointvec,
4267 .procname = "router_solicitations",
4268 .data = &ipv6_devconf.rtr_solicits,
4269 .maxlen = sizeof(int),
4271 .proc_handler = proc_dointvec,
4274 .procname = "router_solicitation_interval",
4275 .data = &ipv6_devconf.rtr_solicit_interval,
4276 .maxlen = sizeof(int),
4278 .proc_handler = proc_dointvec_jiffies,
4281 .procname = "router_solicitation_delay",
4282 .data = &ipv6_devconf.rtr_solicit_delay,
4283 .maxlen = sizeof(int),
4285 .proc_handler = proc_dointvec_jiffies,
4288 .procname = "force_mld_version",
4289 .data = &ipv6_devconf.force_mld_version,
4290 .maxlen = sizeof(int),
4292 .proc_handler = proc_dointvec,
4294 #ifdef CONFIG_IPV6_PRIVACY
4296 .procname = "use_tempaddr",
4297 .data = &ipv6_devconf.use_tempaddr,
4298 .maxlen = sizeof(int),
4300 .proc_handler = proc_dointvec,
4303 .procname = "temp_valid_lft",
4304 .data = &ipv6_devconf.temp_valid_lft,
4305 .maxlen = sizeof(int),
4307 .proc_handler = proc_dointvec,
4310 .procname = "temp_prefered_lft",
4311 .data = &ipv6_devconf.temp_prefered_lft,
4312 .maxlen = sizeof(int),
4314 .proc_handler = proc_dointvec,
4317 .procname = "regen_max_retry",
4318 .data = &ipv6_devconf.regen_max_retry,
4319 .maxlen = sizeof(int),
4321 .proc_handler = proc_dointvec,
4324 .procname = "max_desync_factor",
4325 .data = &ipv6_devconf.max_desync_factor,
4326 .maxlen = sizeof(int),
4328 .proc_handler = proc_dointvec,
4332 .procname = "max_addresses",
4333 .data = &ipv6_devconf.max_addresses,
4334 .maxlen = sizeof(int),
4336 .proc_handler = proc_dointvec,
4339 .procname = "accept_ra_defrtr",
4340 .data = &ipv6_devconf.accept_ra_defrtr,
4341 .maxlen = sizeof(int),
4343 .proc_handler = proc_dointvec,
4346 .procname = "accept_ra_pinfo",
4347 .data = &ipv6_devconf.accept_ra_pinfo,
4348 .maxlen = sizeof(int),
4350 .proc_handler = proc_dointvec,
4352 #ifdef CONFIG_IPV6_ROUTER_PREF
4354 .procname = "accept_ra_rtr_pref",
4355 .data = &ipv6_devconf.accept_ra_rtr_pref,
4356 .maxlen = sizeof(int),
4358 .proc_handler = proc_dointvec,
4361 .procname = "router_probe_interval",
4362 .data = &ipv6_devconf.rtr_probe_interval,
4363 .maxlen = sizeof(int),
4365 .proc_handler = proc_dointvec_jiffies,
4367 #ifdef CONFIG_IPV6_ROUTE_INFO
4369 .procname = "accept_ra_rt_info_max_plen",
4370 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4371 .maxlen = sizeof(int),
4373 .proc_handler = proc_dointvec,
4378 .procname = "proxy_ndp",
4379 .data = &ipv6_devconf.proxy_ndp,
4380 .maxlen = sizeof(int),
4382 .proc_handler = proc_dointvec,
4385 .procname = "accept_source_route",
4386 .data = &ipv6_devconf.accept_source_route,
4387 .maxlen = sizeof(int),
4389 .proc_handler = proc_dointvec,
4391 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4393 .procname = "optimistic_dad",
4394 .data = &ipv6_devconf.optimistic_dad,
4395 .maxlen = sizeof(int),
4397 .proc_handler = proc_dointvec,
4401 #ifdef CONFIG_IPV6_MROUTE
4403 .procname = "mc_forwarding",
4404 .data = &ipv6_devconf.mc_forwarding,
4405 .maxlen = sizeof(int),
4407 .proc_handler = proc_dointvec,
4411 .procname = "disable_ipv6",
4412 .data = &ipv6_devconf.disable_ipv6,
4413 .maxlen = sizeof(int),
4415 .proc_handler = addrconf_sysctl_disable,
4418 .procname = "accept_dad",
4419 .data = &ipv6_devconf.accept_dad,
4420 .maxlen = sizeof(int),
4422 .proc_handler = proc_dointvec,
4425 .procname = "force_tllao",
4426 .data = &ipv6_devconf.force_tllao,
4427 .maxlen = sizeof(int),
4429 .proc_handler = proc_dointvec
4437 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4438 struct inet6_dev *idev, struct ipv6_devconf *p)
4441 struct addrconf_sysctl_table *t;
4443 #define ADDRCONF_CTL_PATH_DEV 3
4445 struct ctl_path addrconf_ctl_path[] = {
4446 { .procname = "net", },
4447 { .procname = "ipv6", },
4448 { .procname = "conf", },
4449 { /* to be set */ },
4454 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4458 for (i = 0; t->addrconf_vars[i].data; i++) {
4459 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
4460 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4461 t->addrconf_vars[i].extra2 = net;
4465 * Make a copy of dev_name, because '.procname' is regarded as const
4466 * by sysctl and we wouldn't want anyone to change it under our feet
4467 * (see SIOCSIFNAME).
4469 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4473 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4475 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4477 if (t->sysctl_header == NULL)
4491 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4493 struct addrconf_sysctl_table *t;
4495 if (p->sysctl == NULL)
4500 unregister_sysctl_table(t->sysctl_header);
4505 static void addrconf_sysctl_register(struct inet6_dev *idev)
4507 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
4508 &ndisc_ifinfo_sysctl_change);
4509 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4513 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4515 __addrconf_sysctl_unregister(&idev->cnf);
4516 neigh_sysctl_unregister(idev->nd_parms);
4522 static int __net_init addrconf_init_net(struct net *net)
4525 struct ipv6_devconf *all, *dflt;
4528 all = &ipv6_devconf;
4529 dflt = &ipv6_devconf_dflt;
4531 if (!net_eq(net, &init_net)) {
4532 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4536 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4538 goto err_alloc_dflt;
4540 /* these will be inherited by all namespaces */
4541 dflt->autoconf = ipv6_defaults.autoconf;
4542 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
4545 net->ipv6.devconf_all = all;
4546 net->ipv6.devconf_dflt = dflt;
4548 #ifdef CONFIG_SYSCTL
4549 err = __addrconf_sysctl_register(net, "all", NULL, all);
4553 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
4559 #ifdef CONFIG_SYSCTL
4561 __addrconf_sysctl_unregister(all);
4571 static void __net_exit addrconf_exit_net(struct net *net)
4573 #ifdef CONFIG_SYSCTL
4574 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4575 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4577 if (!net_eq(net, &init_net)) {
4578 kfree(net->ipv6.devconf_dflt);
4579 kfree(net->ipv6.devconf_all);
4583 static struct pernet_operations addrconf_ops = {
4584 .init = addrconf_init_net,
4585 .exit = addrconf_exit_net,
4592 int register_inet6addr_notifier(struct notifier_block *nb)
4594 return atomic_notifier_chain_register(&inet6addr_chain, nb);
4596 EXPORT_SYMBOL(register_inet6addr_notifier);
4598 int unregister_inet6addr_notifier(struct notifier_block *nb)
4600 return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
4602 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4605 * Init / cleanup code
4608 int __init addrconf_init(void)
4612 err = ipv6_addr_label_init();
4614 printk(KERN_CRIT "IPv6 Addrconf:"
4615 " cannot initialize default policy table: %d.\n", err);
4619 register_pernet_subsys(&addrconf_ops);
4621 /* The addrconf netdev notifier requires that loopback_dev
4622 * has it's ipv6 private information allocated and setup
4623 * before it can bring up and give link-local addresses
4624 * to other devices which are up.
4626 * Unfortunately, loopback_dev is not necessarily the first
4627 * entry in the global dev_base list of net devices. In fact,
4628 * it is likely to be the very last entry on that list.
4629 * So this causes the notifier registry below to try and
4630 * give link-local addresses to all devices besides loopback_dev
4631 * first, then loopback_dev, which cases all the non-loopback_dev
4632 * devices to fail to get a link-local address.
4634 * So, as a temporary fix, allocate the ipv6 structure for
4635 * loopback_dev first by hand.
4636 * Longer term, all of the dependencies ipv6 has upon the loopback
4637 * device and it being up should be removed.
4640 if (!ipv6_add_dev(init_net.loopback_dev))
4646 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4647 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
4649 register_netdevice_notifier(&ipv6_dev_notf);
4653 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4657 /* Only the first call to __rtnl_register can fail */
4658 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4659 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4660 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4661 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4662 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4664 ipv6_addr_label_rtnl_register();
4668 unregister_netdevice_notifier(&ipv6_dev_notf);
4670 unregister_pernet_subsys(&addrconf_ops);
4675 void addrconf_cleanup(void)
4677 struct net_device *dev;
4680 unregister_netdevice_notifier(&ipv6_dev_notf);
4681 unregister_pernet_subsys(&addrconf_ops);
4685 /* clean dev list */
4686 for_each_netdev(&init_net, dev) {
4687 if (__in6_dev_get(dev) == NULL)
4689 addrconf_ifdown(dev, 1);
4691 addrconf_ifdown(init_net.loopback_dev, 2);
4696 spin_lock_bh(&addrconf_hash_lock);
4697 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4698 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
4699 spin_unlock_bh(&addrconf_hash_lock);
4701 del_timer(&addr_chk_timer);