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 * $Id: addrconf.c,v 1.69 2001/10/31 21:55:54 davem Exp $
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * as published by the Free Software Foundation; either version
14 * 2 of the License, or (at your option) any later version.
20 * Janos Farkas : delete timer on ifdown
21 * <chexum@bankinf.banki.hu>
22 * Andi Kleen : kill double kfree on module
24 * Maciej W. Rozycki : FDDI support
25 * sekiya@USAGI : Don't send too many RS
27 * yoshfuji@USAGI : Fixed interval between DAD
29 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
30 * address validation timer.
31 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
33 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
34 * address on a same interface.
35 * YOSHIFUJI Hideaki @USAGI : ARCnet support
36 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
38 * YOSHIFUJI Hideaki @USAGI : improved source address
39 * selection; consider scope,
43 #include <linux/errno.h>
44 #include <linux/types.h>
45 #include <linux/socket.h>
46 #include <linux/sockios.h>
47 #include <linux/net.h>
48 #include <linux/in6.h>
49 #include <linux/netdevice.h>
50 #include <linux/if_addr.h>
51 #include <linux/if_arp.h>
52 #include <linux/if_arcnet.h>
53 #include <linux/if_infiniband.h>
54 #include <linux/route.h>
55 #include <linux/inetdevice.h>
56 #include <linux/init.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 <asm/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)))
104 static void addrconf_sysctl_register(struct inet6_dev *idev);
105 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
107 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
111 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
116 #ifdef CONFIG_IPV6_PRIVACY
117 static int __ipv6_regen_rndid(struct inet6_dev *idev);
118 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
119 static void ipv6_regen_rndid(unsigned long data);
121 static int desync_factor = MAX_DESYNC_FACTOR * HZ;
124 static int ipv6_count_addresses(struct inet6_dev *idev);
127 * Configured unicast address hash table
129 static struct inet6_ifaddr *inet6_addr_lst[IN6_ADDR_HSIZE];
130 static DEFINE_RWLOCK(addrconf_hash_lock);
132 static void addrconf_verify(unsigned long);
134 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
135 static DEFINE_SPINLOCK(addrconf_verify_lock);
137 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
138 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
140 static int addrconf_ifdown(struct net_device *dev, int how);
142 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
143 static void addrconf_dad_timer(unsigned long data);
144 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
145 static void addrconf_dad_run(struct inet6_dev *idev);
146 static void addrconf_rs_timer(unsigned long data);
147 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
148 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
150 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
151 struct prefix_info *pinfo);
152 static int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
153 struct net_device *dev);
155 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
157 struct ipv6_devconf ipv6_devconf __read_mostly = {
159 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
160 .mtu6 = IPV6_MIN_MTU,
162 .accept_redirects = 1,
164 .force_mld_version = 0,
166 .rtr_solicits = MAX_RTR_SOLICITATIONS,
167 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
168 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
169 #ifdef CONFIG_IPV6_PRIVACY
171 .temp_valid_lft = TEMP_VALID_LIFETIME,
172 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
173 .regen_max_retry = REGEN_MAX_RETRY,
174 .max_desync_factor = MAX_DESYNC_FACTOR,
176 .max_addresses = IPV6_MAX_ADDRESSES,
177 .accept_ra_defrtr = 1,
178 .accept_ra_pinfo = 1,
179 #ifdef CONFIG_IPV6_ROUTER_PREF
180 .accept_ra_rtr_pref = 1,
181 .rtr_probe_interval = 60 * HZ,
182 #ifdef CONFIG_IPV6_ROUTE_INFO
183 .accept_ra_rt_info_max_plen = 0,
187 .accept_source_route = 0, /* we do not accept RH0 by default. */
190 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
192 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
193 .mtu6 = IPV6_MIN_MTU,
195 .accept_redirects = 1,
198 .rtr_solicits = MAX_RTR_SOLICITATIONS,
199 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
200 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
201 #ifdef CONFIG_IPV6_PRIVACY
203 .temp_valid_lft = TEMP_VALID_LIFETIME,
204 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
205 .regen_max_retry = REGEN_MAX_RETRY,
206 .max_desync_factor = MAX_DESYNC_FACTOR,
208 .max_addresses = IPV6_MAX_ADDRESSES,
209 .accept_ra_defrtr = 1,
210 .accept_ra_pinfo = 1,
211 #ifdef CONFIG_IPV6_ROUTER_PREF
212 .accept_ra_rtr_pref = 1,
213 .rtr_probe_interval = 60 * HZ,
214 #ifdef CONFIG_IPV6_ROUTE_INFO
215 .accept_ra_rt_info_max_plen = 0,
219 .accept_source_route = 0, /* we do not accept RH0 by default. */
222 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
223 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
224 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
226 /* Check if a valid qdisc is available */
227 static inline int addrconf_qdisc_ok(struct net_device *dev)
229 return (dev->qdisc != &noop_qdisc);
232 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
234 if (del_timer(&ifp->timer))
238 enum addrconf_timer_t
245 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
246 enum addrconf_timer_t what,
249 if (!del_timer(&ifp->timer))
254 ifp->timer.function = addrconf_dad_timer;
257 ifp->timer.function = addrconf_rs_timer;
261 ifp->timer.expires = jiffies + when;
262 add_timer(&ifp->timer);
265 static int snmp6_alloc_dev(struct inet6_dev *idev)
267 if (snmp_mib_init((void **)idev->stats.ipv6,
268 sizeof(struct ipstats_mib)) < 0)
270 if (snmp_mib_init((void **)idev->stats.icmpv6,
271 sizeof(struct icmpv6_mib)) < 0)
273 if (snmp_mib_init((void **)idev->stats.icmpv6msg,
274 sizeof(struct icmpv6msg_mib)) < 0)
280 snmp_mib_free((void **)idev->stats.icmpv6);
282 snmp_mib_free((void **)idev->stats.ipv6);
287 static void snmp6_free_dev(struct inet6_dev *idev)
289 snmp_mib_free((void **)idev->stats.icmpv6msg);
290 snmp_mib_free((void **)idev->stats.icmpv6);
291 snmp_mib_free((void **)idev->stats.ipv6);
294 /* Nobody refers to this device, we may destroy it. */
296 static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
298 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
302 void in6_dev_finish_destroy(struct inet6_dev *idev)
304 struct net_device *dev = idev->dev;
305 BUG_TRAP(idev->addr_list==NULL);
306 BUG_TRAP(idev->mc_list==NULL);
307 #ifdef NET_REFCNT_DEBUG
308 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
312 printk("Freeing alive inet6 device %p\n", idev);
315 snmp6_free_dev(idev);
316 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
319 EXPORT_SYMBOL(in6_dev_finish_destroy);
321 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
323 struct inet6_dev *ndev;
324 struct in6_addr maddr;
328 if (dev->mtu < IPV6_MIN_MTU)
331 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
336 rwlock_init(&ndev->lock);
338 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
339 ndev->cnf.mtu6 = dev->mtu;
340 ndev->cnf.sysctl = NULL;
341 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
342 if (ndev->nd_parms == NULL) {
346 /* We refer to the device */
349 if (snmp6_alloc_dev(ndev) < 0) {
351 "%s(): cannot allocate memory for statistics; dev=%s.\n",
352 __func__, dev->name));
353 neigh_parms_release(&nd_tbl, ndev->nd_parms);
355 in6_dev_finish_destroy(ndev);
359 if (snmp6_register_dev(ndev) < 0) {
361 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
362 __func__, dev->name));
363 neigh_parms_release(&nd_tbl, ndev->nd_parms);
365 in6_dev_finish_destroy(ndev);
369 /* One reference from device. We must do this before
370 * we invoke __ipv6_regen_rndid().
374 #ifdef CONFIG_IPV6_PRIVACY
375 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
376 if ((dev->flags&IFF_LOOPBACK) ||
377 dev->type == ARPHRD_TUNNEL ||
378 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
379 dev->type == ARPHRD_SIT ||
381 dev->type == ARPHRD_NONE) {
383 "%s: Disabled Privacy Extensions\n",
385 ndev->cnf.use_tempaddr = -1;
387 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
389 "%s: Disabled Multicast RS\n",
391 ndev->cnf.rtr_solicits = 0;
395 ipv6_regen_rndid((unsigned long) ndev);
399 if (netif_running(dev) && addrconf_qdisc_ok(dev))
400 ndev->if_flags |= IF_READY;
402 ipv6_mc_init_dev(ndev);
403 ndev->tstamp = jiffies;
404 addrconf_sysctl_register(ndev);
405 /* protected by rtnl_lock */
406 rcu_assign_pointer(dev->ip6_ptr, ndev);
408 /* Join all-node multicast group */
409 ipv6_addr_all_nodes(&maddr);
410 ipv6_dev_mc_inc(dev, &maddr);
415 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
417 struct inet6_dev *idev;
421 if ((idev = __in6_dev_get(dev)) == NULL) {
422 if ((idev = ipv6_add_dev(dev)) == NULL)
426 if (dev->flags&IFF_UP)
432 static void dev_forward_change(struct inet6_dev *idev)
434 struct net_device *dev;
435 struct inet6_ifaddr *ifa;
436 struct in6_addr addr;
441 if (dev && (dev->flags & IFF_MULTICAST)) {
442 ipv6_addr_all_routers(&addr);
444 if (idev->cnf.forwarding)
445 ipv6_dev_mc_inc(dev, &addr);
447 ipv6_dev_mc_dec(dev, &addr);
449 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
450 if (ifa->flags&IFA_F_TENTATIVE)
452 if (idev->cnf.forwarding)
453 addrconf_join_anycast(ifa);
455 addrconf_leave_anycast(ifa);
460 static void addrconf_forward_change(struct net *net, __s32 newf)
462 struct net_device *dev;
463 struct inet6_dev *idev;
465 read_lock(&dev_base_lock);
466 for_each_netdev(net, dev) {
468 idev = __in6_dev_get(dev);
470 int changed = (!idev->cnf.forwarding) ^ (!newf);
471 idev->cnf.forwarding = newf;
473 dev_forward_change(idev);
477 read_unlock(&dev_base_lock);
480 static void addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
484 net = (struct net *)table->extra2;
485 if (p == &net->ipv6.devconf_dflt->forwarding)
488 if (p == &net->ipv6.devconf_all->forwarding) {
489 __s32 newf = net->ipv6.devconf_all->forwarding;
490 net->ipv6.devconf_dflt->forwarding = newf;
491 addrconf_forward_change(net, newf);
492 } else if ((!*p) ^ (!old))
493 dev_forward_change((struct inet6_dev *)table->extra1);
496 rt6_purge_dflt_routers(net);
500 /* Nobody refers to this ifaddr, destroy it */
502 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
504 BUG_TRAP(ifp->if_next==NULL);
505 BUG_TRAP(ifp->lst_next==NULL);
506 #ifdef NET_REFCNT_DEBUG
507 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
510 in6_dev_put(ifp->idev);
512 if (del_timer(&ifp->timer))
513 printk("Timer is still running, when freeing ifa=%p\n", ifp);
516 printk("Freeing alive inet6 address %p\n", ifp);
519 dst_release(&ifp->rt->u.dst);
525 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
527 struct inet6_ifaddr *ifa, **ifap;
528 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
531 * Each device address list is sorted in order of scope -
532 * global before linklocal.
534 for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
535 ifap = &ifa->if_next) {
536 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
540 ifp->if_next = *ifap;
544 /* On success it returns ifp with increased reference count */
546 static struct inet6_ifaddr *
547 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
548 int scope, u32 flags)
550 struct inet6_ifaddr *ifa = NULL;
557 err = -ENODEV; /*XXX*/
561 write_lock(&addrconf_hash_lock);
563 /* Ignore adding duplicate addresses on an interface */
564 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
565 ADBG(("ipv6_add_addr: already assigned\n"));
570 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
573 ADBG(("ipv6_add_addr: malloc failed\n"));
578 rt = addrconf_dst_alloc(idev, addr, 0);
584 ipv6_addr_copy(&ifa->addr, addr);
586 spin_lock_init(&ifa->lock);
587 init_timer(&ifa->timer);
588 ifa->timer.data = (unsigned long) ifa;
590 ifa->prefix_len = pfxlen;
591 ifa->flags = flags | IFA_F_TENTATIVE;
592 ifa->cstamp = ifa->tstamp = jiffies;
597 * part one of RFC 4429, section 3.3
598 * We should not configure an address as
599 * optimistic if we do not yet know the link
600 * layer address of our nexhop router
603 if (rt->rt6i_nexthop == NULL)
604 ifa->flags &= ~IFA_F_OPTIMISTIC;
611 /* Add to big hash table */
612 hash = ipv6_addr_hash(addr);
614 ifa->lst_next = inet6_addr_lst[hash];
615 inet6_addr_lst[hash] = ifa;
617 write_unlock(&addrconf_hash_lock);
619 write_lock(&idev->lock);
620 /* Add to inet6_dev unicast addr list. */
621 ipv6_link_dev_addr(idev, ifa);
623 #ifdef CONFIG_IPV6_PRIVACY
624 if (ifa->flags&IFA_F_TEMPORARY) {
625 ifa->tmp_next = idev->tempaddr_list;
626 idev->tempaddr_list = ifa;
632 write_unlock(&idev->lock);
634 rcu_read_unlock_bh();
636 if (likely(err == 0))
637 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
645 write_unlock(&addrconf_hash_lock);
649 /* This function wants to get referenced ifp and releases it before return */
651 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
653 struct inet6_ifaddr *ifa, **ifap;
654 struct inet6_dev *idev = ifp->idev;
656 int deleted = 0, onlink = 0;
657 unsigned long expires = jiffies;
659 hash = ipv6_addr_hash(&ifp->addr);
663 write_lock_bh(&addrconf_hash_lock);
664 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
665 ifap = &ifa->lst_next) {
667 *ifap = ifa->lst_next;
669 ifa->lst_next = NULL;
673 write_unlock_bh(&addrconf_hash_lock);
675 write_lock_bh(&idev->lock);
676 #ifdef CONFIG_IPV6_PRIVACY
677 if (ifp->flags&IFA_F_TEMPORARY) {
678 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
679 ifap = &ifa->tmp_next) {
681 *ifap = ifa->tmp_next;
683 in6_ifa_put(ifp->ifpub);
687 ifa->tmp_next = NULL;
694 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
696 *ifap = ifa->if_next;
699 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
703 } else if (ifp->flags & IFA_F_PERMANENT) {
704 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
706 if (ifa->flags & IFA_F_PERMANENT) {
711 unsigned long lifetime;
716 spin_lock(&ifa->lock);
717 lifetime = min_t(unsigned long,
718 ifa->valid_lft, 0x7fffffffUL/HZ);
719 if (time_before(expires,
720 ifa->tstamp + lifetime * HZ))
721 expires = ifa->tstamp + lifetime * HZ;
722 spin_unlock(&ifa->lock);
726 ifap = &ifa->if_next;
728 write_unlock_bh(&idev->lock);
730 ipv6_ifa_notify(RTM_DELADDR, ifp);
732 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
734 addrconf_del_timer(ifp);
737 * Purge or update corresponding prefix
739 * 1) we don't purge prefix here if address was not permanent.
740 * prefix is managed by its own lifetime.
741 * 2) if there're no addresses, delete prefix.
742 * 3) if there're still other permanent address(es),
743 * corresponding prefix is still permanent.
744 * 4) otherwise, update prefix lifetime to the
745 * longest valid lifetime among the corresponding
746 * addresses on the device.
747 * Note: subsequent RA will update lifetime.
751 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
752 struct in6_addr prefix;
754 struct net *net = dev_net(ifp->idev->dev);
755 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
756 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
758 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
762 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
763 rt->rt6i_expires = expires;
764 rt->rt6i_flags |= RTF_EXPIRES;
767 dst_release(&rt->u.dst);
773 #ifdef CONFIG_IPV6_PRIVACY
774 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
776 struct inet6_dev *idev = ifp->idev;
777 struct in6_addr addr, *tmpaddr;
778 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
779 unsigned long regen_advance;
785 write_lock(&idev->lock);
787 spin_lock_bh(&ift->lock);
788 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
789 spin_unlock_bh(&ift->lock);
796 if (idev->cnf.use_tempaddr <= 0) {
797 write_unlock(&idev->lock);
799 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
804 spin_lock_bh(&ifp->lock);
805 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
806 idev->cnf.use_tempaddr = -1; /*XXX*/
807 spin_unlock_bh(&ifp->lock);
808 write_unlock(&idev->lock);
810 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
816 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
817 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
818 spin_unlock_bh(&ifp->lock);
819 write_unlock(&idev->lock);
821 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
827 memcpy(&addr.s6_addr[8], idev->rndid, 8);
828 tmp_valid_lft = min_t(__u32,
830 idev->cnf.temp_valid_lft);
831 tmp_prefered_lft = min_t(__u32,
833 idev->cnf.temp_prefered_lft - desync_factor / HZ);
834 tmp_plen = ifp->prefix_len;
835 max_addresses = idev->cnf.max_addresses;
836 tmp_cstamp = ifp->cstamp;
837 tmp_tstamp = ifp->tstamp;
838 spin_unlock_bh(&ifp->lock);
840 regen_advance = idev->cnf.regen_max_retry *
841 idev->cnf.dad_transmits *
842 idev->nd_parms->retrans_time / HZ;
843 write_unlock(&idev->lock);
845 /* A temporary address is created only if this calculated Preferred
846 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
847 * an implementation must not create a temporary address with a zero
848 * Preferred Lifetime.
850 if (tmp_prefered_lft <= regen_advance) {
857 addr_flags = IFA_F_TEMPORARY;
858 /* set in addrconf_prefix_rcv() */
859 if (ifp->flags & IFA_F_OPTIMISTIC)
860 addr_flags |= IFA_F_OPTIMISTIC;
862 ift = !max_addresses ||
863 ipv6_count_addresses(idev) < max_addresses ?
864 ipv6_add_addr(idev, &addr, tmp_plen,
865 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
867 if (!ift || IS_ERR(ift)) {
871 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
873 write_lock(&idev->lock);
877 spin_lock_bh(&ift->lock);
879 ift->valid_lft = tmp_valid_lft;
880 ift->prefered_lft = tmp_prefered_lft;
881 ift->cstamp = tmp_cstamp;
882 ift->tstamp = tmp_tstamp;
883 spin_unlock_bh(&ift->lock);
885 addrconf_dad_start(ift, 0);
894 * Choose an appropriate source address (RFC3484)
897 IPV6_SADDR_RULE_INIT = 0,
898 IPV6_SADDR_RULE_LOCAL,
899 IPV6_SADDR_RULE_SCOPE,
900 IPV6_SADDR_RULE_PREFERRED,
901 #ifdef CONFIG_IPV6_MIP6
905 IPV6_SADDR_RULE_LABEL,
906 #ifdef CONFIG_IPV6_PRIVACY
907 IPV6_SADDR_RULE_PRIVACY,
909 IPV6_SADDR_RULE_ORCHID,
910 IPV6_SADDR_RULE_PREFIX,
914 struct ipv6_saddr_score {
917 struct inet6_ifaddr *ifa;
918 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
923 struct ipv6_saddr_dst {
924 struct in6_addr *addr;
931 static inline int ipv6_saddr_preferred(int type)
933 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
934 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
939 static int ipv6_get_saddr_eval(struct ipv6_saddr_score *score,
940 struct ipv6_saddr_dst *dst,
945 if (i <= score->rule) {
947 case IPV6_SADDR_RULE_SCOPE:
948 ret = score->scopedist;
950 case IPV6_SADDR_RULE_PREFIX:
951 ret = score->matchlen;
954 ret = !!test_bit(i, score->scorebits);
960 case IPV6_SADDR_RULE_INIT:
961 /* Rule 0: remember if hiscore is not ready yet */
964 case IPV6_SADDR_RULE_LOCAL:
965 /* Rule 1: Prefer same address */
966 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
968 case IPV6_SADDR_RULE_SCOPE:
969 /* Rule 2: Prefer appropriate scope
974 * ---+--+-+---> scope
976 * | d is scope of the destination.
978 * | \ <- smaller scope is better if
979 * B-15 | \ if scope is enough for destinaion.
980 * | ret = B - scope (-1 <= scope >= d <= 15).
982 * |/ <- greater is better
983 * -C / if scope is not enough for destination.
984 * /| ret = scope - C (-1 <= d < scope <= 15).
986 * d - C - 1 < B -15 (for all -1 <= d <= 15).
987 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
988 * Assume B = 0 and we get C > 29.
990 ret = __ipv6_addr_src_scope(score->addr_type);
991 if (ret >= dst->scope)
994 ret -= 128; /* 30 is enough */
995 score->scopedist = ret;
997 case IPV6_SADDR_RULE_PREFERRED:
998 /* Rule 3: Avoid deprecated and optimistic addresses */
999 ret = ipv6_saddr_preferred(score->addr_type) ||
1000 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1002 #ifdef CONFIG_IPV6_MIP6
1003 case IPV6_SADDR_RULE_HOA:
1005 /* Rule 4: Prefer home address */
1006 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1007 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1011 case IPV6_SADDR_RULE_OIF:
1012 /* Rule 5: Prefer outgoing interface */
1013 ret = (!dst->ifindex ||
1014 dst->ifindex == score->ifa->idev->dev->ifindex);
1016 case IPV6_SADDR_RULE_LABEL:
1017 /* Rule 6: Prefer matching label */
1018 ret = ipv6_addr_label(&score->ifa->addr, score->addr_type,
1019 score->ifa->idev->dev->ifindex) == dst->label;
1021 #ifdef CONFIG_IPV6_PRIVACY
1022 case IPV6_SADDR_RULE_PRIVACY:
1024 /* Rule 7: Prefer public address
1025 * Note: prefer temprary address if use_tempaddr >= 2
1027 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1028 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1029 score->ifa->idev->cnf.use_tempaddr >= 2;
1030 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1034 case IPV6_SADDR_RULE_ORCHID:
1035 /* Rule 8-: Prefer ORCHID vs ORCHID or
1036 * non-ORCHID vs non-ORCHID
1038 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1039 ipv6_addr_orchid(dst->addr));
1041 case IPV6_SADDR_RULE_PREFIX:
1042 /* Rule 8: Use longest matching prefix */
1043 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1051 __set_bit(i, score->scorebits);
1057 int ipv6_dev_get_saddr(struct net_device *dst_dev,
1058 struct in6_addr *daddr, unsigned int prefs,
1059 struct in6_addr *saddr)
1061 struct ipv6_saddr_score scores[2],
1062 *score = &scores[0], *hiscore = &scores[1];
1063 struct net *net = dev_net(dst_dev);
1064 struct ipv6_saddr_dst dst;
1065 struct net_device *dev;
1068 dst_type = __ipv6_addr_type(daddr);
1070 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1071 dst.scope = __ipv6_addr_src_scope(dst_type);
1072 dst.label = ipv6_addr_label(daddr, dst_type, dst.ifindex);
1076 hiscore->ifa = NULL;
1078 read_lock(&dev_base_lock);
1081 for_each_netdev(net, dev) {
1082 struct inet6_dev *idev;
1084 /* Candidate Source Address (section 4)
1085 * - multicast and link-local destination address,
1086 * the set of candidate source address MUST only
1087 * include addresses assigned to interfaces
1088 * belonging to the same link as the outgoing
1090 * (- For site-local destination addresses, the
1091 * set of candidate source addresses MUST only
1092 * include addresses assigned to interfaces
1093 * belonging to the same site as the outgoing
1096 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1097 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1098 dst.ifindex && dev->ifindex != dst.ifindex)
1101 idev = __in6_dev_get(dev);
1105 read_lock_bh(&idev->lock);
1106 for (score->ifa = idev->addr_list; score->ifa; score->ifa = score->ifa->if_next) {
1110 * - Tentative Address (RFC2462 section 5.4)
1111 * - A tentative address is not considered
1112 * "assigned to an interface" in the traditional
1113 * sense, unless it is also flagged as optimistic.
1114 * - Candidate Source Address (section 4)
1115 * - In any case, anycast addresses, multicast
1116 * addresses, and the unspecified address MUST
1117 * NOT be included in a candidate set.
1119 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1120 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1123 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1125 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1126 score->addr_type & IPV6_ADDR_MULTICAST)) {
1127 LIMIT_NETDEBUG(KERN_DEBUG
1128 "ADDRCONF: unspecified / multicast address "
1129 "assigned as unicast address on %s",
1135 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1137 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1138 int minihiscore, miniscore;
1140 minihiscore = ipv6_get_saddr_eval(hiscore, &dst, i);
1141 miniscore = ipv6_get_saddr_eval(score, &dst, i);
1143 if (minihiscore > miniscore) {
1144 if (i == IPV6_SADDR_RULE_SCOPE &&
1145 score->scopedist > 0) {
1148 * each remaining entry
1149 * has too small (not enough)
1150 * scope, because ifa entries
1151 * are sorted by their scope
1157 } else if (minihiscore < miniscore) {
1158 struct ipv6_saddr_score *tmp;
1161 in6_ifa_put(hiscore->ifa);
1163 in6_ifa_hold(score->ifa);
1169 /* restore our iterator */
1170 score->ifa = hiscore->ifa;
1177 read_unlock_bh(&idev->lock);
1180 read_unlock(&dev_base_lock);
1183 return -EADDRNOTAVAIL;
1185 ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1186 in6_ifa_put(hiscore->ifa);
1190 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1192 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1193 unsigned char banned_flags)
1195 struct inet6_dev *idev;
1196 int err = -EADDRNOTAVAIL;
1199 if ((idev = __in6_dev_get(dev)) != NULL) {
1200 struct inet6_ifaddr *ifp;
1202 read_lock_bh(&idev->lock);
1203 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1204 if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1205 ipv6_addr_copy(addr, &ifp->addr);
1210 read_unlock_bh(&idev->lock);
1216 static int ipv6_count_addresses(struct inet6_dev *idev)
1219 struct inet6_ifaddr *ifp;
1221 read_lock_bh(&idev->lock);
1222 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1224 read_unlock_bh(&idev->lock);
1228 int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1229 struct net_device *dev, int strict)
1231 struct inet6_ifaddr * ifp;
1232 u8 hash = ipv6_addr_hash(addr);
1234 read_lock_bh(&addrconf_hash_lock);
1235 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1236 if (!net_eq(dev_net(ifp->idev->dev), net))
1238 if (ipv6_addr_equal(&ifp->addr, addr) &&
1239 !(ifp->flags&IFA_F_TENTATIVE)) {
1240 if (dev == NULL || ifp->idev->dev == dev ||
1241 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1245 read_unlock_bh(&addrconf_hash_lock);
1248 EXPORT_SYMBOL(ipv6_chk_addr);
1251 int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1252 struct net_device *dev)
1254 struct inet6_ifaddr * ifp;
1255 u8 hash = ipv6_addr_hash(addr);
1257 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1258 if (!net_eq(dev_net(ifp->idev->dev), net))
1260 if (ipv6_addr_equal(&ifp->addr, addr)) {
1261 if (dev == NULL || ifp->idev->dev == dev)
1268 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, struct in6_addr *addr,
1269 struct net_device *dev, int strict)
1271 struct inet6_ifaddr * ifp;
1272 u8 hash = ipv6_addr_hash(addr);
1274 read_lock_bh(&addrconf_hash_lock);
1275 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1276 if (!net_eq(dev_net(ifp->idev->dev), net))
1278 if (ipv6_addr_equal(&ifp->addr, addr)) {
1279 if (dev == NULL || ifp->idev->dev == dev ||
1280 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1286 read_unlock_bh(&addrconf_hash_lock);
1291 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1293 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1294 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
1295 __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1296 __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1297 int sk_ipv6only = ipv6_only_sock(sk);
1298 int sk2_ipv6only = inet_v6_ipv6only(sk2);
1299 int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1300 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1302 if (!sk2_rcv_saddr && !sk_ipv6only)
1305 if (addr_type2 == IPV6_ADDR_ANY &&
1306 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1309 if (addr_type == IPV6_ADDR_ANY &&
1310 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1313 if (sk2_rcv_saddr6 &&
1314 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1317 if (addr_type == IPV6_ADDR_MAPPED &&
1319 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1325 /* Gets referenced address, destroys ifaddr */
1327 static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1329 if (ifp->flags&IFA_F_PERMANENT) {
1330 spin_lock_bh(&ifp->lock);
1331 addrconf_del_timer(ifp);
1332 ifp->flags |= IFA_F_TENTATIVE;
1333 spin_unlock_bh(&ifp->lock);
1335 #ifdef CONFIG_IPV6_PRIVACY
1336 } else if (ifp->flags&IFA_F_TEMPORARY) {
1337 struct inet6_ifaddr *ifpub;
1338 spin_lock_bh(&ifp->lock);
1341 in6_ifa_hold(ifpub);
1342 spin_unlock_bh(&ifp->lock);
1343 ipv6_create_tempaddr(ifpub, ifp);
1346 spin_unlock_bh(&ifp->lock);
1354 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1356 if (net_ratelimit())
1357 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1358 addrconf_dad_stop(ifp);
1361 /* Join to solicited addr multicast group. */
1363 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1365 struct in6_addr maddr;
1367 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1370 addrconf_addr_solict_mult(addr, &maddr);
1371 ipv6_dev_mc_inc(dev, &maddr);
1374 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1376 struct in6_addr maddr;
1378 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1381 addrconf_addr_solict_mult(addr, &maddr);
1382 __ipv6_dev_mc_dec(idev, &maddr);
1385 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1387 struct in6_addr addr;
1388 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1389 if (ipv6_addr_any(&addr))
1391 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1394 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1396 struct in6_addr addr;
1397 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1398 if (ipv6_addr_any(&addr))
1400 __ipv6_dev_ac_dec(ifp->idev, &addr);
1403 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1405 if (dev->addr_len != ETH_ALEN)
1407 memcpy(eui, dev->dev_addr, 3);
1408 memcpy(eui + 5, dev->dev_addr + 3, 3);
1411 * The zSeries OSA network cards can be shared among various
1412 * OS instances, but the OSA cards have only one MAC address.
1413 * This leads to duplicate address conflicts in conjunction
1414 * with IPv6 if more than one instance uses the same card.
1416 * The driver for these cards can deliver a unique 16-bit
1417 * identifier for each instance sharing the same card. It is
1418 * placed instead of 0xFFFE in the interface identifier. The
1419 * "u" bit of the interface identifier is not inverted in this
1420 * case. Hence the resulting interface identifier has local
1421 * scope according to RFC2373.
1424 eui[3] = (dev->dev_id >> 8) & 0xFF;
1425 eui[4] = dev->dev_id & 0xFF;
1434 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1436 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1437 if (dev->addr_len != ARCNET_ALEN)
1440 eui[7] = *(u8*)dev->dev_addr;
1444 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1446 if (dev->addr_len != INFINIBAND_ALEN)
1448 memcpy(eui, dev->dev_addr + 12, 8);
1453 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1455 switch (dev->type) {
1458 case ARPHRD_IEEE802_TR:
1459 return addrconf_ifid_eui48(eui, dev);
1461 return addrconf_ifid_arcnet(eui, dev);
1462 case ARPHRD_INFINIBAND:
1463 return addrconf_ifid_infiniband(eui, dev);
1465 if (dev->priv_flags & IFF_ISATAP)
1466 return ipv6_isatap_eui64(eui, *(__be32 *)dev->dev_addr);
1471 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1474 struct inet6_ifaddr *ifp;
1476 read_lock_bh(&idev->lock);
1477 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1478 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1479 memcpy(eui, ifp->addr.s6_addr+8, 8);
1484 read_unlock_bh(&idev->lock);
1488 #ifdef CONFIG_IPV6_PRIVACY
1489 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1490 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1493 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1494 idev->rndid[0] &= ~0x02;
1497 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1498 * check if generated address is not inappropriate
1500 * - Reserved subnet anycast (RFC 2526)
1501 * 11111101 11....11 1xxxxxxx
1502 * - ISATAP (RFC4214) 6.1
1503 * 00-00-5E-FE-xx-xx-xx-xx
1505 * - XXX: already assigned to an address on the device
1507 if (idev->rndid[0] == 0xfd &&
1508 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1509 (idev->rndid[7]&0x80))
1511 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1512 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1514 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1521 static void ipv6_regen_rndid(unsigned long data)
1523 struct inet6_dev *idev = (struct inet6_dev *) data;
1524 unsigned long expires;
1527 write_lock_bh(&idev->lock);
1532 if (__ipv6_regen_rndid(idev) < 0)
1536 idev->cnf.temp_prefered_lft * HZ -
1537 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1538 if (time_before(expires, jiffies)) {
1540 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1545 if (!mod_timer(&idev->regen_timer, expires))
1549 write_unlock_bh(&idev->lock);
1550 rcu_read_unlock_bh();
1554 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1557 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1558 ret = __ipv6_regen_rndid(idev);
1568 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1569 unsigned long expires, u32 flags)
1571 struct fib6_config cfg = {
1572 .fc_table = RT6_TABLE_PREFIX,
1573 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1574 .fc_ifindex = dev->ifindex,
1575 .fc_expires = expires,
1577 .fc_flags = RTF_UP | flags,
1578 .fc_nlinfo.nl_net = dev_net(dev),
1581 ipv6_addr_copy(&cfg.fc_dst, pfx);
1583 /* Prevent useless cloning on PtP SIT.
1584 This thing is done here expecting that the whole
1585 class of non-broadcast devices need not cloning.
1587 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1588 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1589 cfg.fc_flags |= RTF_NONEXTHOP;
1592 ip6_route_add(&cfg);
1595 /* Create "default" multicast route to the interface */
1597 static void addrconf_add_mroute(struct net_device *dev)
1599 struct fib6_config cfg = {
1600 .fc_table = RT6_TABLE_LOCAL,
1601 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1602 .fc_ifindex = dev->ifindex,
1605 .fc_nlinfo.nl_net = dev_net(dev),
1608 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1610 ip6_route_add(&cfg);
1613 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1614 static void sit_route_add(struct net_device *dev)
1616 struct fib6_config cfg = {
1617 .fc_table = RT6_TABLE_MAIN,
1618 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1619 .fc_ifindex = dev->ifindex,
1621 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1622 .fc_nlinfo.nl_net = dev_net(dev),
1625 /* prefix length - 96 bits "::d.d.d.d" */
1626 ip6_route_add(&cfg);
1630 static void addrconf_add_lroute(struct net_device *dev)
1632 struct in6_addr addr;
1634 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1635 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1638 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1640 struct inet6_dev *idev;
1644 if ((idev = ipv6_find_idev(dev)) == NULL)
1647 /* Add default multicast route */
1648 addrconf_add_mroute(dev);
1650 /* Add link local route */
1651 addrconf_add_lroute(dev);
1655 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1657 struct prefix_info *pinfo;
1661 unsigned long rt_expires;
1662 struct inet6_dev *in6_dev;
1664 pinfo = (struct prefix_info *) opt;
1666 if (len < sizeof(struct prefix_info)) {
1667 ADBG(("addrconf: prefix option too short\n"));
1672 * Validation checks ([ADDRCONF], page 19)
1675 addr_type = ipv6_addr_type(&pinfo->prefix);
1677 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1680 valid_lft = ntohl(pinfo->valid);
1681 prefered_lft = ntohl(pinfo->prefered);
1683 if (prefered_lft > valid_lft) {
1684 if (net_ratelimit())
1685 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1689 in6_dev = in6_dev_get(dev);
1691 if (in6_dev == NULL) {
1692 if (net_ratelimit())
1693 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1698 * Two things going on here:
1699 * 1) Add routes for on-link prefixes
1700 * 2) Configure prefixes with the auto flag set
1703 /* Avoid arithmetic overflow. Really, we could
1704 save rt_expires in seconds, likely valid_lft,
1705 but it would require division in fib gc, that it
1708 if (valid_lft >= 0x7FFFFFFF/HZ)
1709 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1711 rt_expires = valid_lft * HZ;
1714 * We convert this (in jiffies) to clock_t later.
1715 * Avoid arithmetic overflow there as well.
1716 * Overflow can happen only if HZ < USER_HZ.
1718 if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1719 rt_expires = 0x7FFFFFFF / USER_HZ;
1721 if (pinfo->onlink) {
1722 struct rt6_info *rt;
1723 rt = rt6_lookup(dev_net(dev), &pinfo->prefix, NULL,
1726 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1727 if (rt->rt6i_flags&RTF_EXPIRES) {
1728 if (valid_lft == 0) {
1732 rt->rt6i_expires = jiffies + rt_expires;
1735 } else if (valid_lft) {
1736 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1737 dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1740 dst_release(&rt->u.dst);
1743 /* Try to figure out our local address for this prefix */
1745 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1746 struct inet6_ifaddr * ifp;
1747 struct in6_addr addr;
1748 int create = 0, update_lft = 0;
1750 if (pinfo->prefix_len == 64) {
1751 memcpy(&addr, &pinfo->prefix, 8);
1752 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1753 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1754 in6_dev_put(in6_dev);
1759 if (net_ratelimit())
1760 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1762 in6_dev_put(in6_dev);
1767 ifp = ipv6_get_ifaddr(dev_net(dev), &addr, dev, 1);
1769 if (ifp == NULL && valid_lft) {
1770 int max_addresses = in6_dev->cnf.max_addresses;
1773 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1774 if (in6_dev->cnf.optimistic_dad &&
1775 !ipv6_devconf.forwarding)
1776 addr_flags = IFA_F_OPTIMISTIC;
1779 /* Do not allow to create too much of autoconfigured
1780 * addresses; this would be too easy way to crash kernel.
1782 if (!max_addresses ||
1783 ipv6_count_addresses(in6_dev) < max_addresses)
1784 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1785 addr_type&IPV6_ADDR_SCOPE_MASK,
1788 if (!ifp || IS_ERR(ifp)) {
1789 in6_dev_put(in6_dev);
1793 update_lft = create = 1;
1794 ifp->cstamp = jiffies;
1795 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1801 #ifdef CONFIG_IPV6_PRIVACY
1802 struct inet6_ifaddr *ift;
1806 /* update lifetime (RFC2462 5.5.3 e) */
1807 spin_lock(&ifp->lock);
1809 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1810 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1813 if (!update_lft && stored_lft) {
1814 if (valid_lft > MIN_VALID_LIFETIME ||
1815 valid_lft > stored_lft)
1817 else if (stored_lft <= MIN_VALID_LIFETIME) {
1818 /* valid_lft <= stored_lft is always true */
1822 valid_lft = MIN_VALID_LIFETIME;
1823 if (valid_lft < prefered_lft)
1824 prefered_lft = valid_lft;
1830 ifp->valid_lft = valid_lft;
1831 ifp->prefered_lft = prefered_lft;
1834 ifp->flags &= ~IFA_F_DEPRECATED;
1835 spin_unlock(&ifp->lock);
1837 if (!(flags&IFA_F_TENTATIVE))
1838 ipv6_ifa_notify(0, ifp);
1840 spin_unlock(&ifp->lock);
1842 #ifdef CONFIG_IPV6_PRIVACY
1843 read_lock_bh(&in6_dev->lock);
1844 /* update all temporary addresses in the list */
1845 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1847 * When adjusting the lifetimes of an existing
1848 * temporary address, only lower the lifetimes.
1849 * Implementations must not increase the
1850 * lifetimes of an existing temporary address
1851 * when processing a Prefix Information Option.
1853 if (ifp != ift->ifpub)
1856 spin_lock(&ift->lock);
1858 if (ift->valid_lft > valid_lft &&
1859 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1860 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1861 if (ift->prefered_lft > prefered_lft &&
1862 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1863 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1864 spin_unlock(&ift->lock);
1865 if (!(flags&IFA_F_TENTATIVE))
1866 ipv6_ifa_notify(0, ift);
1869 if (create && in6_dev->cnf.use_tempaddr > 0) {
1871 * When a new public address is created as described in [ADDRCONF],
1872 * also create a new temporary address.
1874 read_unlock_bh(&in6_dev->lock);
1875 ipv6_create_tempaddr(ifp, NULL);
1877 read_unlock_bh(&in6_dev->lock);
1884 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1885 in6_dev_put(in6_dev);
1889 * Set destination address.
1890 * Special case for SIT interfaces where we create a new "virtual"
1893 int addrconf_set_dstaddr(struct net *net, void __user *arg)
1895 struct in6_ifreq ireq;
1896 struct net_device *dev;
1902 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1905 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1911 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1912 if (dev->type == ARPHRD_SIT) {
1915 struct ip_tunnel_parm p;
1917 err = -EADDRNOTAVAIL;
1918 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1921 memset(&p, 0, sizeof(p));
1922 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1926 p.iph.protocol = IPPROTO_IPV6;
1928 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1930 oldfs = get_fs(); set_fs(KERNEL_DS);
1931 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1936 dev = __dev_get_by_name(net, p.name);
1939 err = dev_open(dev);
1950 * Manual configuration of address on an interface
1952 static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx,
1953 int plen, __u8 ifa_flags, __u32 prefered_lft,
1956 struct inet6_ifaddr *ifp;
1957 struct inet6_dev *idev;
1958 struct net_device *dev;
1960 u32 flags = RTF_EXPIRES;
1964 /* check the lifetime */
1965 if (!valid_lft || prefered_lft > valid_lft)
1968 dev = __dev_get_by_index(net, ifindex);
1972 if ((idev = addrconf_add_dev(dev)) == NULL)
1975 scope = ipv6_addr_scope(pfx);
1977 if (valid_lft == INFINITY_LIFE_TIME) {
1978 ifa_flags |= IFA_F_PERMANENT;
1980 } else if (valid_lft >= 0x7FFFFFFF/HZ)
1981 valid_lft = 0x7FFFFFFF/HZ;
1983 if (prefered_lft == 0)
1984 ifa_flags |= IFA_F_DEPRECATED;
1985 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
1986 (prefered_lft != INFINITY_LIFE_TIME))
1987 prefered_lft = 0x7FFFFFFF/HZ;
1989 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
1992 spin_lock_bh(&ifp->lock);
1993 ifp->valid_lft = valid_lft;
1994 ifp->prefered_lft = prefered_lft;
1995 ifp->tstamp = jiffies;
1996 spin_unlock_bh(&ifp->lock);
1998 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
1999 jiffies_to_clock_t(valid_lft * HZ), flags);
2001 * Note that section 3.1 of RFC 4429 indicates
2002 * that the Optimistic flag should not be set for
2003 * manually configured addresses
2005 addrconf_dad_start(ifp, 0);
2011 return PTR_ERR(ifp);
2014 static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx,
2017 struct inet6_ifaddr *ifp;
2018 struct inet6_dev *idev;
2019 struct net_device *dev;
2021 dev = __dev_get_by_index(net, ifindex);
2025 if ((idev = __in6_dev_get(dev)) == NULL)
2028 read_lock_bh(&idev->lock);
2029 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
2030 if (ifp->prefix_len == plen &&
2031 ipv6_addr_equal(pfx, &ifp->addr)) {
2033 read_unlock_bh(&idev->lock);
2037 /* If the last address is deleted administratively,
2038 disable IPv6 on this interface.
2040 if (idev->addr_list == NULL)
2041 addrconf_ifdown(idev->dev, 1);
2045 read_unlock_bh(&idev->lock);
2046 return -EADDRNOTAVAIL;
2050 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2052 struct in6_ifreq ireq;
2055 if (!capable(CAP_NET_ADMIN))
2058 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2062 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2063 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2064 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2069 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2071 struct in6_ifreq ireq;
2074 if (!capable(CAP_NET_ADMIN))
2077 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2081 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2082 ireq.ifr6_prefixlen);
2087 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2088 static void sit_add_v4_addrs(struct inet6_dev *idev)
2090 struct inet6_ifaddr * ifp;
2091 struct in6_addr addr;
2092 struct net_device *dev;
2093 struct net *net = dev_net(idev->dev);
2098 memset(&addr, 0, sizeof(struct in6_addr));
2099 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2101 if (idev->dev->flags&IFF_POINTOPOINT) {
2102 addr.s6_addr32[0] = htonl(0xfe800000);
2105 scope = IPV6_ADDR_COMPATv4;
2108 if (addr.s6_addr32[3]) {
2109 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
2111 spin_lock_bh(&ifp->lock);
2112 ifp->flags &= ~IFA_F_TENTATIVE;
2113 spin_unlock_bh(&ifp->lock);
2114 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2120 for_each_netdev(net, dev) {
2121 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2122 if (in_dev && (dev->flags & IFF_UP)) {
2123 struct in_ifaddr * ifa;
2127 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2130 addr.s6_addr32[3] = ifa->ifa_local;
2132 if (ifa->ifa_scope == RT_SCOPE_LINK)
2134 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2135 if (idev->dev->flags&IFF_POINTOPOINT)
2139 if (idev->dev->flags&IFF_POINTOPOINT)
2144 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2147 spin_lock_bh(&ifp->lock);
2148 ifp->flags &= ~IFA_F_TENTATIVE;
2149 spin_unlock_bh(&ifp->lock);
2150 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2159 static void init_loopback(struct net_device *dev)
2161 struct inet6_dev *idev;
2162 struct inet6_ifaddr * ifp;
2168 if ((idev = ipv6_find_idev(dev)) == NULL) {
2169 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2173 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2175 spin_lock_bh(&ifp->lock);
2176 ifp->flags &= ~IFA_F_TENTATIVE;
2177 spin_unlock_bh(&ifp->lock);
2178 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2183 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2185 struct inet6_ifaddr * ifp;
2186 u32 addr_flags = IFA_F_PERMANENT;
2188 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2189 if (idev->cnf.optimistic_dad &&
2190 !ipv6_devconf.forwarding)
2191 addr_flags |= IFA_F_OPTIMISTIC;
2195 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2197 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2198 addrconf_dad_start(ifp, 0);
2203 static void addrconf_dev_config(struct net_device *dev)
2205 struct in6_addr addr;
2206 struct inet6_dev * idev;
2210 if ((dev->type != ARPHRD_ETHER) &&
2211 (dev->type != ARPHRD_FDDI) &&
2212 (dev->type != ARPHRD_IEEE802_TR) &&
2213 (dev->type != ARPHRD_ARCNET) &&
2214 (dev->type != ARPHRD_INFINIBAND)) {
2215 /* Alas, we support only Ethernet autoconfiguration. */
2219 idev = addrconf_add_dev(dev);
2223 memset(&addr, 0, sizeof(struct in6_addr));
2224 addr.s6_addr32[0] = htonl(0xFE800000);
2226 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2227 addrconf_add_linklocal(idev, &addr);
2230 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2231 static void addrconf_sit_config(struct net_device *dev)
2233 struct inet6_dev *idev;
2238 * Configure the tunnel with one of our IPv4
2239 * addresses... we should configure all of
2240 * our v4 addrs in the tunnel
2243 if ((idev = ipv6_find_idev(dev)) == NULL) {
2244 printk(KERN_DEBUG "init sit: add_dev failed\n");
2248 if (dev->priv_flags & IFF_ISATAP) {
2249 struct in6_addr addr;
2251 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2252 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2253 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2254 addrconf_add_linklocal(idev, &addr);
2258 sit_add_v4_addrs(idev);
2260 if (dev->flags&IFF_POINTOPOINT) {
2261 addrconf_add_mroute(dev);
2262 addrconf_add_lroute(dev);
2269 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2271 struct in6_addr lladdr;
2273 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2274 addrconf_add_linklocal(idev, &lladdr);
2280 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2282 struct net_device *link_dev;
2283 struct net *net = dev_net(idev->dev);
2285 /* first try to inherit the link-local address from the link device */
2286 if (idev->dev->iflink &&
2287 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2288 if (!ipv6_inherit_linklocal(idev, link_dev))
2291 /* then try to inherit it from any device */
2292 for_each_netdev(net, link_dev) {
2293 if (!ipv6_inherit_linklocal(idev, link_dev))
2296 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2300 * Autoconfigure tunnel with a link-local address so routing protocols,
2301 * DHCPv6, MLD etc. can be run over the virtual link
2304 static void addrconf_ip6_tnl_config(struct net_device *dev)
2306 struct inet6_dev *idev;
2310 if ((idev = addrconf_add_dev(dev)) == NULL) {
2311 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2314 ip6_tnl_add_linklocal(idev);
2317 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2320 struct net_device *dev = (struct net_device *) data;
2321 struct inet6_dev *idev = __in6_dev_get(dev);
2322 int run_pending = 0;
2326 case NETDEV_REGISTER:
2327 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2328 idev = ipv6_add_dev(dev);
2330 return notifier_from_errno(-ENOMEM);
2335 if (dev->flags & IFF_SLAVE)
2338 if (event == NETDEV_UP) {
2339 if (!addrconf_qdisc_ok(dev)) {
2340 /* device is not ready yet. */
2342 "ADDRCONF(NETDEV_UP): %s: "
2343 "link is not ready\n",
2348 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2349 idev = ipv6_add_dev(dev);
2352 idev->if_flags |= IF_READY;
2354 if (!addrconf_qdisc_ok(dev)) {
2355 /* device is still not ready. */
2360 if (idev->if_flags & IF_READY) {
2361 /* device is already configured. */
2364 idev->if_flags |= IF_READY;
2368 "ADDRCONF(NETDEV_CHANGE): %s: "
2369 "link becomes ready\n",
2376 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2378 addrconf_sit_config(dev);
2381 case ARPHRD_TUNNEL6:
2382 addrconf_ip6_tnl_config(dev);
2384 case ARPHRD_LOOPBACK:
2389 addrconf_dev_config(dev);
2394 addrconf_dad_run(idev);
2396 /* If the MTU changed during the interface down, when the
2397 interface up, the changed MTU must be reflected in the
2398 idev as well as routers.
2400 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2401 rt6_mtu_change(dev, dev->mtu);
2402 idev->cnf.mtu6 = dev->mtu;
2404 idev->tstamp = jiffies;
2405 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2406 /* If the changed mtu during down is lower than IPV6_MIN_MTU
2407 stop IPv6 on this interface.
2409 if (dev->mtu < IPV6_MIN_MTU)
2410 addrconf_ifdown(dev, event != NETDEV_DOWN);
2414 case NETDEV_CHANGEMTU:
2415 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2416 rt6_mtu_change(dev, dev->mtu);
2417 idev->cnf.mtu6 = dev->mtu;
2421 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2422 idev = ipv6_add_dev(dev);
2427 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2430 case NETDEV_UNREGISTER:
2432 * Remove all addresses from this interface.
2434 addrconf_ifdown(dev, event != NETDEV_DOWN);
2437 case NETDEV_CHANGENAME:
2439 snmp6_unregister_dev(idev);
2440 addrconf_sysctl_unregister(idev);
2441 addrconf_sysctl_register(idev);
2442 err = snmp6_register_dev(idev);
2444 return notifier_from_errno(err);
2453 * addrconf module should be notified of a device going up
2455 static struct notifier_block ipv6_dev_notf = {
2456 .notifier_call = addrconf_notify,
2460 static int addrconf_ifdown(struct net_device *dev, int how)
2462 struct inet6_dev *idev;
2463 struct inet6_ifaddr *ifa, **bifa;
2464 struct net *net = dev_net(dev);
2469 if (dev == init_net.loopback_dev && how == 1)
2472 rt6_ifdown(net, dev);
2473 neigh_ifdown(&nd_tbl, dev);
2475 idev = __in6_dev_get(dev);
2479 /* Step 1: remove reference to ipv6 device from parent device.
2485 /* protected by rtnl_lock */
2486 rcu_assign_pointer(dev->ip6_ptr, NULL);
2488 /* Step 1.5: remove snmp6 entry */
2489 snmp6_unregister_dev(idev);
2493 /* Step 2: clear hash table */
2494 for (i=0; i<IN6_ADDR_HSIZE; i++) {
2495 bifa = &inet6_addr_lst[i];
2497 write_lock_bh(&addrconf_hash_lock);
2498 while ((ifa = *bifa) != NULL) {
2499 if (ifa->idev == idev) {
2500 *bifa = ifa->lst_next;
2501 ifa->lst_next = NULL;
2502 addrconf_del_timer(ifa);
2506 bifa = &ifa->lst_next;
2508 write_unlock_bh(&addrconf_hash_lock);
2511 write_lock_bh(&idev->lock);
2513 /* Step 3: clear flags for stateless addrconf */
2515 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2517 /* Step 4: clear address list */
2518 #ifdef CONFIG_IPV6_PRIVACY
2519 if (how == 1 && del_timer(&idev->regen_timer))
2522 /* clear tempaddr list */
2523 while ((ifa = idev->tempaddr_list) != NULL) {
2524 idev->tempaddr_list = ifa->tmp_next;
2525 ifa->tmp_next = NULL;
2527 write_unlock_bh(&idev->lock);
2528 spin_lock_bh(&ifa->lock);
2531 in6_ifa_put(ifa->ifpub);
2534 spin_unlock_bh(&ifa->lock);
2536 write_lock_bh(&idev->lock);
2539 while ((ifa = idev->addr_list) != NULL) {
2540 idev->addr_list = ifa->if_next;
2541 ifa->if_next = NULL;
2543 addrconf_del_timer(ifa);
2544 write_unlock_bh(&idev->lock);
2546 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2547 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2550 write_lock_bh(&idev->lock);
2552 write_unlock_bh(&idev->lock);
2554 /* Step 5: Discard multicast list */
2557 ipv6_mc_destroy_dev(idev);
2561 idev->tstamp = jiffies;
2563 /* Shot the device (if unregistered) */
2566 addrconf_sysctl_unregister(idev);
2567 neigh_parms_release(&nd_tbl, idev->nd_parms);
2568 neigh_ifdown(&nd_tbl, dev);
2574 static void addrconf_rs_timer(unsigned long data)
2576 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2578 if (ifp->idev->cnf.forwarding)
2581 if (ifp->idev->if_flags & IF_RA_RCVD) {
2583 * Announcement received after solicitation
2589 spin_lock(&ifp->lock);
2590 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2591 struct in6_addr all_routers;
2593 /* The wait after the last probe can be shorter */
2594 addrconf_mod_timer(ifp, AC_RS,
2595 (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2596 ifp->idev->cnf.rtr_solicit_delay :
2597 ifp->idev->cnf.rtr_solicit_interval);
2598 spin_unlock(&ifp->lock);
2600 ipv6_addr_all_routers(&all_routers);
2602 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2604 spin_unlock(&ifp->lock);
2606 * Note: we do not support deprecated "all on-link"
2607 * assumption any longer.
2609 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2610 ifp->idev->dev->name);
2618 * Duplicate Address Detection
2620 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2622 unsigned long rand_num;
2623 struct inet6_dev *idev = ifp->idev;
2625 if (ifp->flags & IFA_F_OPTIMISTIC)
2628 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2630 ifp->probes = idev->cnf.dad_transmits;
2631 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2634 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2636 struct inet6_dev *idev = ifp->idev;
2637 struct net_device *dev = idev->dev;
2639 addrconf_join_solict(dev, &ifp->addr);
2641 net_srandom(ifp->addr.s6_addr32[3]);
2643 read_lock_bh(&idev->lock);
2646 spin_lock_bh(&ifp->lock);
2648 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2649 !(ifp->flags&IFA_F_TENTATIVE) ||
2650 ifp->flags & IFA_F_NODAD) {
2651 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2652 spin_unlock_bh(&ifp->lock);
2653 read_unlock_bh(&idev->lock);
2655 addrconf_dad_completed(ifp);
2659 if (!(idev->if_flags & IF_READY)) {
2660 spin_unlock_bh(&ifp->lock);
2661 read_unlock_bh(&idev->lock);
2663 * If the defice is not ready:
2664 * - keep it tentative if it is a permanent address.
2665 * - otherwise, kill it.
2668 addrconf_dad_stop(ifp);
2673 * Optimistic nodes can start receiving
2676 if(ifp->flags & IFA_F_OPTIMISTIC)
2677 ip6_ins_rt(ifp->rt);
2679 addrconf_dad_kick(ifp);
2680 spin_unlock_bh(&ifp->lock);
2682 read_unlock_bh(&idev->lock);
2685 static void addrconf_dad_timer(unsigned long data)
2687 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2688 struct inet6_dev *idev = ifp->idev;
2689 struct in6_addr unspec;
2690 struct in6_addr mcaddr;
2692 read_lock_bh(&idev->lock);
2694 read_unlock_bh(&idev->lock);
2697 spin_lock_bh(&ifp->lock);
2698 if (ifp->probes == 0) {
2700 * DAD was successful
2703 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2704 spin_unlock_bh(&ifp->lock);
2705 read_unlock_bh(&idev->lock);
2707 addrconf_dad_completed(ifp);
2713 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2714 spin_unlock_bh(&ifp->lock);
2715 read_unlock_bh(&idev->lock);
2717 /* send a neighbour solicitation for our addr */
2718 memset(&unspec, 0, sizeof(unspec));
2719 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2720 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2725 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2727 struct net_device * dev = ifp->idev->dev;
2730 * Configure the address for reception. Now it is valid.
2733 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2735 /* If added prefix is link local and forwarding is off,
2736 start sending router solicitations.
2739 if (ifp->idev->cnf.forwarding == 0 &&
2740 ifp->idev->cnf.rtr_solicits > 0 &&
2741 (dev->flags&IFF_LOOPBACK) == 0 &&
2742 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2743 struct in6_addr all_routers;
2745 ipv6_addr_all_routers(&all_routers);
2748 * If a host as already performed a random delay
2749 * [...] as part of DAD [...] there is no need
2750 * to delay again before sending the first RS
2752 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2754 spin_lock_bh(&ifp->lock);
2756 ifp->idev->if_flags |= IF_RS_SENT;
2757 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2758 spin_unlock_bh(&ifp->lock);
2762 static void addrconf_dad_run(struct inet6_dev *idev) {
2763 struct inet6_ifaddr *ifp;
2765 read_lock_bh(&idev->lock);
2766 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2767 spin_lock_bh(&ifp->lock);
2768 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2769 spin_unlock_bh(&ifp->lock);
2772 spin_unlock_bh(&ifp->lock);
2773 addrconf_dad_kick(ifp);
2775 read_unlock_bh(&idev->lock);
2778 #ifdef CONFIG_PROC_FS
2779 struct if6_iter_state {
2780 struct seq_net_private p;
2784 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2786 struct inet6_ifaddr *ifa = NULL;
2787 struct if6_iter_state *state = seq->private;
2788 struct net *net = seq_file_net(seq);
2790 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2791 ifa = inet6_addr_lst[state->bucket];
2793 while (ifa && !net_eq(dev_net(ifa->idev->dev), net))
2794 ifa = ifa->lst_next;
2801 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2803 struct if6_iter_state *state = seq->private;
2804 struct net *net = seq_file_net(seq);
2806 ifa = ifa->lst_next;
2809 if (!net_eq(dev_net(ifa->idev->dev), net)) {
2810 ifa = ifa->lst_next;
2815 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2816 ifa = inet6_addr_lst[state->bucket];
2823 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2825 struct inet6_ifaddr *ifa = if6_get_first(seq);
2828 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2830 return pos ? NULL : ifa;
2833 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2834 __acquires(addrconf_hash_lock)
2836 read_lock_bh(&addrconf_hash_lock);
2837 return if6_get_idx(seq, *pos);
2840 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2842 struct inet6_ifaddr *ifa;
2844 ifa = if6_get_next(seq, v);
2849 static void if6_seq_stop(struct seq_file *seq, void *v)
2850 __releases(addrconf_hash_lock)
2852 read_unlock_bh(&addrconf_hash_lock);
2855 static int if6_seq_show(struct seq_file *seq, void *v)
2857 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2859 NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
2861 ifp->idev->dev->ifindex,
2865 ifp->idev->dev->name);
2869 static const struct seq_operations if6_seq_ops = {
2870 .start = if6_seq_start,
2871 .next = if6_seq_next,
2872 .show = if6_seq_show,
2873 .stop = if6_seq_stop,
2876 static int if6_seq_open(struct inode *inode, struct file *file)
2878 return seq_open_net(inode, file, &if6_seq_ops,
2879 sizeof(struct if6_iter_state));
2882 static const struct file_operations if6_fops = {
2883 .owner = THIS_MODULE,
2884 .open = if6_seq_open,
2886 .llseek = seq_lseek,
2887 .release = seq_release_net,
2890 static int if6_proc_net_init(struct net *net)
2892 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
2897 static void if6_proc_net_exit(struct net *net)
2899 proc_net_remove(net, "if_inet6");
2902 static struct pernet_operations if6_proc_net_ops = {
2903 .init = if6_proc_net_init,
2904 .exit = if6_proc_net_exit,
2907 int __init if6_proc_init(void)
2909 return register_pernet_subsys(&if6_proc_net_ops);
2912 void if6_proc_exit(void)
2914 unregister_pernet_subsys(&if6_proc_net_ops);
2916 #endif /* CONFIG_PROC_FS */
2918 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
2919 /* Check if address is a home address configured on any interface. */
2920 int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
2923 struct inet6_ifaddr * ifp;
2924 u8 hash = ipv6_addr_hash(addr);
2925 read_lock_bh(&addrconf_hash_lock);
2926 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
2927 if (!net_eq(dev_net(ifp->idev->dev), net))
2929 if (ipv6_addr_cmp(&ifp->addr, addr) == 0 &&
2930 (ifp->flags & IFA_F_HOMEADDRESS)) {
2935 read_unlock_bh(&addrconf_hash_lock);
2941 * Periodic address status verification
2944 static void addrconf_verify(unsigned long foo)
2946 struct inet6_ifaddr *ifp;
2947 unsigned long now, next;
2950 spin_lock_bh(&addrconf_verify_lock);
2952 next = now + ADDR_CHECK_FREQUENCY;
2954 del_timer(&addr_chk_timer);
2956 for (i=0; i < IN6_ADDR_HSIZE; i++) {
2959 read_lock(&addrconf_hash_lock);
2960 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2962 #ifdef CONFIG_IPV6_PRIVACY
2963 unsigned long regen_advance;
2966 if (ifp->flags & IFA_F_PERMANENT)
2969 spin_lock(&ifp->lock);
2970 age = (now - ifp->tstamp) / HZ;
2972 #ifdef CONFIG_IPV6_PRIVACY
2973 regen_advance = ifp->idev->cnf.regen_max_retry *
2974 ifp->idev->cnf.dad_transmits *
2975 ifp->idev->nd_parms->retrans_time / HZ;
2978 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
2979 age >= ifp->valid_lft) {
2980 spin_unlock(&ifp->lock);
2982 read_unlock(&addrconf_hash_lock);
2985 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
2986 spin_unlock(&ifp->lock);
2988 } else if (age >= ifp->prefered_lft) {
2989 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2992 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2994 ifp->flags |= IFA_F_DEPRECATED;
2997 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2998 next = ifp->tstamp + ifp->valid_lft * HZ;
3000 spin_unlock(&ifp->lock);
3004 read_unlock(&addrconf_hash_lock);
3006 ipv6_ifa_notify(0, ifp);
3010 #ifdef CONFIG_IPV6_PRIVACY
3011 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3012 !(ifp->flags&IFA_F_TENTATIVE)) {
3013 if (age >= ifp->prefered_lft - regen_advance) {
3014 struct inet6_ifaddr *ifpub = ifp->ifpub;
3015 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3016 next = ifp->tstamp + ifp->prefered_lft * HZ;
3017 if (!ifp->regen_count && ifpub) {
3020 in6_ifa_hold(ifpub);
3021 spin_unlock(&ifp->lock);
3022 read_unlock(&addrconf_hash_lock);
3023 spin_lock(&ifpub->lock);
3024 ifpub->regen_count = 0;
3025 spin_unlock(&ifpub->lock);
3026 ipv6_create_tempaddr(ifpub, ifp);
3031 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3032 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3033 spin_unlock(&ifp->lock);
3036 /* ifp->prefered_lft <= ifp->valid_lft */
3037 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3038 next = ifp->tstamp + ifp->prefered_lft * HZ;
3039 spin_unlock(&ifp->lock);
3042 read_unlock(&addrconf_hash_lock);
3045 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
3046 add_timer(&addr_chk_timer);
3047 spin_unlock_bh(&addrconf_verify_lock);
3050 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3052 struct in6_addr *pfx = NULL;
3055 pfx = nla_data(addr);
3058 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3061 pfx = nla_data(local);
3067 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3068 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3069 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3070 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3074 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3076 struct net *net = sock_net(skb->sk);
3077 struct ifaddrmsg *ifm;
3078 struct nlattr *tb[IFA_MAX+1];
3079 struct in6_addr *pfx;
3082 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3086 ifm = nlmsg_data(nlh);
3087 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3091 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3094 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3095 u32 prefered_lft, u32 valid_lft)
3097 u32 flags = RTF_EXPIRES;
3099 if (!valid_lft || (prefered_lft > valid_lft))
3102 if (valid_lft == INFINITY_LIFE_TIME) {
3103 ifa_flags |= IFA_F_PERMANENT;
3105 } else if (valid_lft >= 0x7FFFFFFF/HZ)
3106 valid_lft = 0x7FFFFFFF/HZ;
3108 if (prefered_lft == 0)
3109 ifa_flags |= IFA_F_DEPRECATED;
3110 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
3111 (prefered_lft != INFINITY_LIFE_TIME))
3112 prefered_lft = 0x7FFFFFFF/HZ;
3114 spin_lock_bh(&ifp->lock);
3115 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3116 ifp->tstamp = jiffies;
3117 ifp->valid_lft = valid_lft;
3118 ifp->prefered_lft = prefered_lft;
3120 spin_unlock_bh(&ifp->lock);
3121 if (!(ifp->flags&IFA_F_TENTATIVE))
3122 ipv6_ifa_notify(0, ifp);
3124 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3125 jiffies_to_clock_t(valid_lft * HZ), flags);
3132 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3134 struct net *net = sock_net(skb->sk);
3135 struct ifaddrmsg *ifm;
3136 struct nlattr *tb[IFA_MAX+1];
3137 struct in6_addr *pfx;
3138 struct inet6_ifaddr *ifa;
3139 struct net_device *dev;
3140 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3144 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3148 ifm = nlmsg_data(nlh);
3149 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3153 if (tb[IFA_CACHEINFO]) {
3154 struct ifa_cacheinfo *ci;
3156 ci = nla_data(tb[IFA_CACHEINFO]);
3157 valid_lft = ci->ifa_valid;
3158 preferred_lft = ci->ifa_prefered;
3160 preferred_lft = INFINITY_LIFE_TIME;
3161 valid_lft = INFINITY_LIFE_TIME;
3164 dev = __dev_get_by_index(net, ifm->ifa_index);
3168 /* We ignore other flags so far. */
3169 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3171 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3174 * It would be best to check for !NLM_F_CREATE here but
3175 * userspace alreay relies on not having to provide this.
3177 return inet6_addr_add(net, ifm->ifa_index, pfx,
3178 ifm->ifa_prefixlen, ifa_flags,
3179 preferred_lft, valid_lft);
3182 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3183 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3186 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3193 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3194 u8 scope, int ifindex)
3196 struct ifaddrmsg *ifm;
3198 ifm = nlmsg_data(nlh);
3199 ifm->ifa_family = AF_INET6;
3200 ifm->ifa_prefixlen = prefixlen;
3201 ifm->ifa_flags = flags;
3202 ifm->ifa_scope = scope;
3203 ifm->ifa_index = ifindex;
3206 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3207 unsigned long tstamp, u32 preferred, u32 valid)
3209 struct ifa_cacheinfo ci;
3211 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3212 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3213 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3214 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3215 ci.ifa_prefered = preferred;
3216 ci.ifa_valid = valid;
3218 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3221 static inline int rt_scope(int ifa_scope)
3223 if (ifa_scope & IFA_HOST)
3224 return RT_SCOPE_HOST;
3225 else if (ifa_scope & IFA_LINK)
3226 return RT_SCOPE_LINK;
3227 else if (ifa_scope & IFA_SITE)
3228 return RT_SCOPE_SITE;
3230 return RT_SCOPE_UNIVERSE;
3233 static inline int inet6_ifaddr_msgsize(void)
3235 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3236 + nla_total_size(16) /* IFA_ADDRESS */
3237 + nla_total_size(sizeof(struct ifa_cacheinfo));
3240 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3241 u32 pid, u32 seq, int event, unsigned int flags)
3243 struct nlmsghdr *nlh;
3244 u32 preferred, valid;
3246 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3250 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3251 ifa->idev->dev->ifindex);
3253 if (!(ifa->flags&IFA_F_PERMANENT)) {
3254 preferred = ifa->prefered_lft;
3255 valid = ifa->valid_lft;
3256 if (preferred != INFINITY_LIFE_TIME) {
3257 long tval = (jiffies - ifa->tstamp)/HZ;
3259 if (valid != INFINITY_LIFE_TIME)
3263 preferred = INFINITY_LIFE_TIME;
3264 valid = INFINITY_LIFE_TIME;
3267 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3268 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3269 nlmsg_cancel(skb, nlh);
3273 return nlmsg_end(skb, nlh);
3276 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3277 u32 pid, u32 seq, int event, u16 flags)
3279 struct nlmsghdr *nlh;
3280 u8 scope = RT_SCOPE_UNIVERSE;
3281 int ifindex = ifmca->idev->dev->ifindex;
3283 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3284 scope = RT_SCOPE_SITE;
3286 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3290 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3291 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3292 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3293 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3294 nlmsg_cancel(skb, nlh);
3298 return nlmsg_end(skb, nlh);
3301 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3302 u32 pid, u32 seq, int event, unsigned int flags)
3304 struct nlmsghdr *nlh;
3305 u8 scope = RT_SCOPE_UNIVERSE;
3306 int ifindex = ifaca->aca_idev->dev->ifindex;
3308 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3309 scope = RT_SCOPE_SITE;
3311 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3315 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3316 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3317 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3318 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3319 nlmsg_cancel(skb, nlh);
3323 return nlmsg_end(skb, nlh);
3333 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3334 enum addr_type_t type)
3337 int s_idx, s_ip_idx;
3339 struct net_device *dev;
3340 struct inet6_dev *idev = NULL;
3341 struct inet6_ifaddr *ifa;
3342 struct ifmcaddr6 *ifmca;
3343 struct ifacaddr6 *ifaca;
3344 struct net *net = sock_net(skb->sk);
3346 s_idx = cb->args[0];
3347 s_ip_idx = ip_idx = cb->args[1];
3350 for_each_netdev(net, dev) {
3356 if ((idev = in6_dev_get(dev)) == NULL)
3358 read_lock_bh(&idev->lock);
3361 /* unicast address incl. temp addr */
3362 for (ifa = idev->addr_list; ifa;
3363 ifa = ifa->if_next, ip_idx++) {
3364 if (ip_idx < s_ip_idx)
3366 err = inet6_fill_ifaddr(skb, ifa,
3367 NETLINK_CB(cb->skb).pid,
3373 case MULTICAST_ADDR:
3374 /* multicast address */
3375 for (ifmca = idev->mc_list; ifmca;
3376 ifmca = ifmca->next, ip_idx++) {
3377 if (ip_idx < s_ip_idx)
3379 err = inet6_fill_ifmcaddr(skb, ifmca,
3380 NETLINK_CB(cb->skb).pid,
3387 /* anycast address */
3388 for (ifaca = idev->ac_list; ifaca;
3389 ifaca = ifaca->aca_next, ip_idx++) {
3390 if (ip_idx < s_ip_idx)
3392 err = inet6_fill_ifacaddr(skb, ifaca,
3393 NETLINK_CB(cb->skb).pid,
3402 read_unlock_bh(&idev->lock);
3411 cb->args[1] = ip_idx;
3415 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3417 enum addr_type_t type = UNICAST_ADDR;
3419 return inet6_dump_addr(skb, cb, type);
3422 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3424 enum addr_type_t type = MULTICAST_ADDR;
3426 return inet6_dump_addr(skb, cb, type);
3430 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3432 enum addr_type_t type = ANYCAST_ADDR;
3434 return inet6_dump_addr(skb, cb, type);
3437 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3440 struct net *net = sock_net(in_skb->sk);
3441 struct ifaddrmsg *ifm;
3442 struct nlattr *tb[IFA_MAX+1];
3443 struct in6_addr *addr = NULL;
3444 struct net_device *dev = NULL;
3445 struct inet6_ifaddr *ifa;
3446 struct sk_buff *skb;
3449 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3453 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3459 ifm = nlmsg_data(nlh);
3461 dev = __dev_get_by_index(net, ifm->ifa_index);
3463 if ((ifa = ipv6_get_ifaddr(net, addr, dev, 1)) == NULL) {
3464 err = -EADDRNOTAVAIL;
3468 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
3473 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3474 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3476 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3477 WARN_ON(err == -EMSGSIZE);
3481 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
3488 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3490 struct sk_buff *skb;
3491 struct net *net = dev_net(ifa->idev->dev);
3494 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3498 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3500 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3501 WARN_ON(err == -EMSGSIZE);
3505 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3508 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3511 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3512 __s32 *array, int bytes)
3514 BUG_ON(bytes < (DEVCONF_MAX * 4));
3516 memset(array, 0, bytes);
3517 array[DEVCONF_FORWARDING] = cnf->forwarding;
3518 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3519 array[DEVCONF_MTU6] = cnf->mtu6;
3520 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3521 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3522 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3523 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3524 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3525 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3526 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3527 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3528 #ifdef CONFIG_IPV6_PRIVACY
3529 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3530 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3531 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3532 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3533 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3535 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3536 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3537 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3538 #ifdef CONFIG_IPV6_ROUTER_PREF
3539 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3540 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3541 #ifdef CONFIG_IPV6_ROUTE_INFO
3542 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3545 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3546 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3547 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3548 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3552 static inline size_t inet6_if_nlmsg_size(void)
3554 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3555 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3556 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3557 + nla_total_size(4) /* IFLA_MTU */
3558 + nla_total_size(4) /* IFLA_LINK */
3559 + nla_total_size( /* IFLA_PROTINFO */
3560 nla_total_size(4) /* IFLA_INET6_FLAGS */
3561 + nla_total_size(sizeof(struct ifla_cacheinfo))
3562 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3563 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3564 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
3568 static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
3572 int pad = bytes - sizeof(u64) * items;
3575 /* Use put_unaligned() because stats may not be aligned for u64. */
3576 put_unaligned(items, &stats[0]);
3577 for (i = 1; i < items; i++)
3578 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3580 memset(&stats[items], 0, pad);
3583 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3587 case IFLA_INET6_STATS:
3588 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3590 case IFLA_INET6_ICMP6STATS:
3591 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3596 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3597 u32 pid, u32 seq, int event, unsigned int flags)
3599 struct net_device *dev = idev->dev;
3601 struct ifinfomsg *hdr;
3602 struct nlmsghdr *nlh;
3604 struct ifla_cacheinfo ci;
3606 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3610 hdr = nlmsg_data(nlh);
3611 hdr->ifi_family = AF_INET6;
3613 hdr->ifi_type = dev->type;
3614 hdr->ifi_index = dev->ifindex;
3615 hdr->ifi_flags = dev_get_flags(dev);
3616 hdr->ifi_change = 0;
3618 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3621 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3623 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3624 if (dev->ifindex != dev->iflink)
3625 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3627 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3628 if (protoinfo == NULL)
3629 goto nla_put_failure;
3631 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3633 ci.max_reasm_len = IPV6_MAXPLEN;
3634 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3635 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3636 ci.reachable_time = idev->nd_parms->reachable_time;
3637 ci.retrans_time = idev->nd_parms->retrans_time;
3638 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3640 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3642 goto nla_put_failure;
3643 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3645 /* XXX - MC not implemented */
3647 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3649 goto nla_put_failure;
3650 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3652 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3654 goto nla_put_failure;
3655 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3657 nla_nest_end(skb, protoinfo);
3658 return nlmsg_end(skb, nlh);
3661 nlmsg_cancel(skb, nlh);
3665 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3667 struct net *net = sock_net(skb->sk);
3669 int s_idx = cb->args[0];
3670 struct net_device *dev;
3671 struct inet6_dev *idev;
3673 read_lock(&dev_base_lock);
3675 for_each_netdev(net, dev) {
3678 if ((idev = in6_dev_get(dev)) == NULL)
3680 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3681 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3688 read_unlock(&dev_base_lock);
3694 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3696 struct sk_buff *skb;
3697 struct net *net = dev_net(idev->dev);
3700 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
3704 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
3706 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3707 WARN_ON(err == -EMSGSIZE);
3711 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3714 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3717 static inline size_t inet6_prefix_nlmsg_size(void)
3719 return NLMSG_ALIGN(sizeof(struct prefixmsg))
3720 + nla_total_size(sizeof(struct in6_addr))
3721 + nla_total_size(sizeof(struct prefix_cacheinfo));
3724 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3725 struct prefix_info *pinfo, u32 pid, u32 seq,
3726 int event, unsigned int flags)
3728 struct prefixmsg *pmsg;
3729 struct nlmsghdr *nlh;
3730 struct prefix_cacheinfo ci;
3732 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3736 pmsg = nlmsg_data(nlh);
3737 pmsg->prefix_family = AF_INET6;
3738 pmsg->prefix_pad1 = 0;
3739 pmsg->prefix_pad2 = 0;
3740 pmsg->prefix_ifindex = idev->dev->ifindex;
3741 pmsg->prefix_len = pinfo->prefix_len;
3742 pmsg->prefix_type = pinfo->type;
3743 pmsg->prefix_pad3 = 0;
3744 pmsg->prefix_flags = 0;
3746 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3747 if (pinfo->autoconf)
3748 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3750 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3752 ci.preferred_time = ntohl(pinfo->prefered);
3753 ci.valid_time = ntohl(pinfo->valid);
3754 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3756 return nlmsg_end(skb, nlh);
3759 nlmsg_cancel(skb, nlh);
3763 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3764 struct prefix_info *pinfo)
3766 struct sk_buff *skb;
3767 struct net *net = dev_net(idev->dev);
3770 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
3774 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
3776 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3777 WARN_ON(err == -EMSGSIZE);
3781 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3784 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
3787 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3789 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3794 * If the address was optimistic
3795 * we inserted the route at the start of
3796 * our DAD process, so we don't need
3799 if (!(ifp->rt->rt6i_node))
3800 ip6_ins_rt(ifp->rt);
3801 if (ifp->idev->cnf.forwarding)
3802 addrconf_join_anycast(ifp);
3805 if (ifp->idev->cnf.forwarding)
3806 addrconf_leave_anycast(ifp);
3807 addrconf_leave_solict(ifp->idev, &ifp->addr);
3808 dst_hold(&ifp->rt->u.dst);
3809 if (ip6_del_rt(ifp->rt))
3810 dst_free(&ifp->rt->u.dst);
3815 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3818 if (likely(ifp->idev->dead == 0))
3819 __ipv6_ifa_notify(event, ifp);
3820 rcu_read_unlock_bh();
3823 #ifdef CONFIG_SYSCTL
3826 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3827 void __user *buffer, size_t *lenp, loff_t *ppos)
3829 int *valp = ctl->data;
3833 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3836 addrconf_fixup_forwarding(ctl, valp, val);
3840 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3841 int __user *name, int nlen,
3842 void __user *oldval,
3843 size_t __user *oldlenp,
3844 void __user *newval, size_t newlen)
3846 int *valp = table->data;
3850 if (!newval || !newlen)
3852 if (newlen != sizeof(int))
3854 if (get_user(new, (int __user *)newval))
3858 if (oldval && oldlenp) {
3860 if (get_user(len, oldlenp))
3863 if (len > table->maxlen)
3864 len = table->maxlen;
3865 if (copy_to_user(oldval, valp, len))
3867 if (put_user(len, oldlenp))
3873 addrconf_fixup_forwarding(table, valp, val);
3877 static struct addrconf_sysctl_table
3879 struct ctl_table_header *sysctl_header;
3880 ctl_table addrconf_vars[__NET_IPV6_MAX];
3882 } addrconf_sysctl __read_mostly = {
3883 .sysctl_header = NULL,
3886 .ctl_name = NET_IPV6_FORWARDING,
3887 .procname = "forwarding",
3888 .data = &ipv6_devconf.forwarding,
3889 .maxlen = sizeof(int),
3891 .proc_handler = &addrconf_sysctl_forward,
3892 .strategy = &addrconf_sysctl_forward_strategy,
3895 .ctl_name = NET_IPV6_HOP_LIMIT,
3896 .procname = "hop_limit",
3897 .data = &ipv6_devconf.hop_limit,
3898 .maxlen = sizeof(int),
3900 .proc_handler = proc_dointvec,
3903 .ctl_name = NET_IPV6_MTU,
3905 .data = &ipv6_devconf.mtu6,
3906 .maxlen = sizeof(int),
3908 .proc_handler = &proc_dointvec,
3911 .ctl_name = NET_IPV6_ACCEPT_RA,
3912 .procname = "accept_ra",
3913 .data = &ipv6_devconf.accept_ra,
3914 .maxlen = sizeof(int),
3916 .proc_handler = &proc_dointvec,
3919 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS,
3920 .procname = "accept_redirects",
3921 .data = &ipv6_devconf.accept_redirects,
3922 .maxlen = sizeof(int),
3924 .proc_handler = &proc_dointvec,
3927 .ctl_name = NET_IPV6_AUTOCONF,
3928 .procname = "autoconf",
3929 .data = &ipv6_devconf.autoconf,
3930 .maxlen = sizeof(int),
3932 .proc_handler = &proc_dointvec,
3935 .ctl_name = NET_IPV6_DAD_TRANSMITS,
3936 .procname = "dad_transmits",
3937 .data = &ipv6_devconf.dad_transmits,
3938 .maxlen = sizeof(int),
3940 .proc_handler = &proc_dointvec,
3943 .ctl_name = NET_IPV6_RTR_SOLICITS,
3944 .procname = "router_solicitations",
3945 .data = &ipv6_devconf.rtr_solicits,
3946 .maxlen = sizeof(int),
3948 .proc_handler = &proc_dointvec,
3951 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL,
3952 .procname = "router_solicitation_interval",
3953 .data = &ipv6_devconf.rtr_solicit_interval,
3954 .maxlen = sizeof(int),
3956 .proc_handler = &proc_dointvec_jiffies,
3957 .strategy = &sysctl_jiffies,
3960 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY,
3961 .procname = "router_solicitation_delay",
3962 .data = &ipv6_devconf.rtr_solicit_delay,
3963 .maxlen = sizeof(int),
3965 .proc_handler = &proc_dointvec_jiffies,
3966 .strategy = &sysctl_jiffies,
3969 .ctl_name = NET_IPV6_FORCE_MLD_VERSION,
3970 .procname = "force_mld_version",
3971 .data = &ipv6_devconf.force_mld_version,
3972 .maxlen = sizeof(int),
3974 .proc_handler = &proc_dointvec,
3976 #ifdef CONFIG_IPV6_PRIVACY
3978 .ctl_name = NET_IPV6_USE_TEMPADDR,
3979 .procname = "use_tempaddr",
3980 .data = &ipv6_devconf.use_tempaddr,
3981 .maxlen = sizeof(int),
3983 .proc_handler = &proc_dointvec,
3986 .ctl_name = NET_IPV6_TEMP_VALID_LFT,
3987 .procname = "temp_valid_lft",
3988 .data = &ipv6_devconf.temp_valid_lft,
3989 .maxlen = sizeof(int),
3991 .proc_handler = &proc_dointvec,
3994 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT,
3995 .procname = "temp_prefered_lft",
3996 .data = &ipv6_devconf.temp_prefered_lft,
3997 .maxlen = sizeof(int),
3999 .proc_handler = &proc_dointvec,
4002 .ctl_name = NET_IPV6_REGEN_MAX_RETRY,
4003 .procname = "regen_max_retry",
4004 .data = &ipv6_devconf.regen_max_retry,
4005 .maxlen = sizeof(int),
4007 .proc_handler = &proc_dointvec,
4010 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR,
4011 .procname = "max_desync_factor",
4012 .data = &ipv6_devconf.max_desync_factor,
4013 .maxlen = sizeof(int),
4015 .proc_handler = &proc_dointvec,
4019 .ctl_name = NET_IPV6_MAX_ADDRESSES,
4020 .procname = "max_addresses",
4021 .data = &ipv6_devconf.max_addresses,
4022 .maxlen = sizeof(int),
4024 .proc_handler = &proc_dointvec,
4027 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR,
4028 .procname = "accept_ra_defrtr",
4029 .data = &ipv6_devconf.accept_ra_defrtr,
4030 .maxlen = sizeof(int),
4032 .proc_handler = &proc_dointvec,
4035 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO,
4036 .procname = "accept_ra_pinfo",
4037 .data = &ipv6_devconf.accept_ra_pinfo,
4038 .maxlen = sizeof(int),
4040 .proc_handler = &proc_dointvec,
4042 #ifdef CONFIG_IPV6_ROUTER_PREF
4044 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF,
4045 .procname = "accept_ra_rtr_pref",
4046 .data = &ipv6_devconf.accept_ra_rtr_pref,
4047 .maxlen = sizeof(int),
4049 .proc_handler = &proc_dointvec,
4052 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL,
4053 .procname = "router_probe_interval",
4054 .data = &ipv6_devconf.rtr_probe_interval,
4055 .maxlen = sizeof(int),
4057 .proc_handler = &proc_dointvec_jiffies,
4058 .strategy = &sysctl_jiffies,
4060 #ifdef CONFIG_IPV6_ROUTE_INFO
4062 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
4063 .procname = "accept_ra_rt_info_max_plen",
4064 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4065 .maxlen = sizeof(int),
4067 .proc_handler = &proc_dointvec,
4072 .ctl_name = NET_IPV6_PROXY_NDP,
4073 .procname = "proxy_ndp",
4074 .data = &ipv6_devconf.proxy_ndp,
4075 .maxlen = sizeof(int),
4077 .proc_handler = &proc_dointvec,
4080 .ctl_name = NET_IPV6_ACCEPT_SOURCE_ROUTE,
4081 .procname = "accept_source_route",
4082 .data = &ipv6_devconf.accept_source_route,
4083 .maxlen = sizeof(int),
4085 .proc_handler = &proc_dointvec,
4087 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4089 .ctl_name = CTL_UNNUMBERED,
4090 .procname = "optimistic_dad",
4091 .data = &ipv6_devconf.optimistic_dad,
4092 .maxlen = sizeof(int),
4094 .proc_handler = &proc_dointvec,
4099 .ctl_name = 0, /* sentinel */
4104 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4105 int ctl_name, struct inet6_dev *idev, struct ipv6_devconf *p)
4108 struct addrconf_sysctl_table *t;
4110 #define ADDRCONF_CTL_PATH_DEV 3
4112 struct ctl_path addrconf_ctl_path[] = {
4113 { .procname = "net", .ctl_name = CTL_NET, },
4114 { .procname = "ipv6", .ctl_name = NET_IPV6, },
4115 { .procname = "conf", .ctl_name = NET_IPV6_CONF, },
4116 { /* to be set */ },
4121 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4125 for (i=0; t->addrconf_vars[i].data; i++) {
4126 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
4127 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4128 t->addrconf_vars[i].extra2 = net;
4132 * Make a copy of dev_name, because '.procname' is regarded as const
4133 * by sysctl and we wouldn't want anyone to change it under our feet
4134 * (see SIOCSIFNAME).
4136 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4140 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4141 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].ctl_name = ctl_name;
4143 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4145 if (t->sysctl_header == NULL)
4159 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4161 struct addrconf_sysctl_table *t;
4163 if (p->sysctl == NULL)
4168 unregister_sysctl_table(t->sysctl_header);
4173 static void addrconf_sysctl_register(struct inet6_dev *idev)
4175 neigh_sysctl_register(idev->dev, idev->nd_parms, NET_IPV6,
4176 NET_IPV6_NEIGH, "ipv6",
4177 &ndisc_ifinfo_sysctl_change,
4179 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4180 idev->dev->ifindex, idev, &idev->cnf);
4183 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4185 __addrconf_sysctl_unregister(&idev->cnf);
4186 neigh_sysctl_unregister(idev->nd_parms);
4192 static int addrconf_init_net(struct net *net)
4195 struct ipv6_devconf *all, *dflt;
4198 all = &ipv6_devconf;
4199 dflt = &ipv6_devconf_dflt;
4201 if (net != &init_net) {
4202 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4206 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4208 goto err_alloc_dflt;
4211 net->ipv6.devconf_all = all;
4212 net->ipv6.devconf_dflt = dflt;
4214 #ifdef CONFIG_SYSCTL
4215 err = __addrconf_sysctl_register(net, "all", NET_PROTO_CONF_ALL,
4220 err = __addrconf_sysctl_register(net, "default", NET_PROTO_CONF_DEFAULT,
4227 #ifdef CONFIG_SYSCTL
4229 __addrconf_sysctl_unregister(all);
4239 static void addrconf_exit_net(struct net *net)
4241 #ifdef CONFIG_SYSCTL
4242 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4243 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4245 if (net != &init_net) {
4246 kfree(net->ipv6.devconf_dflt);
4247 kfree(net->ipv6.devconf_all);
4251 static struct pernet_operations addrconf_ops = {
4252 .init = addrconf_init_net,
4253 .exit = addrconf_exit_net,
4260 int register_inet6addr_notifier(struct notifier_block *nb)
4262 return atomic_notifier_chain_register(&inet6addr_chain, nb);
4265 EXPORT_SYMBOL(register_inet6addr_notifier);
4267 int unregister_inet6addr_notifier(struct notifier_block *nb)
4269 return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
4272 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4275 static int addrconf_net_init(struct net *net)
4280 static void addrconf_net_exit(struct net *net)
4282 struct net_device *dev;
4285 /* clean dev list */
4286 for_each_netdev(net, dev) {
4287 if (__in6_dev_get(dev) == NULL)
4289 addrconf_ifdown(dev, 1);
4291 addrconf_ifdown(net->loopback_dev, 2);
4295 static struct pernet_operations addrconf_net_ops = {
4296 .init = addrconf_net_init,
4297 .exit = addrconf_net_exit,
4301 * Init / cleanup code
4304 int __init addrconf_init(void)
4308 if ((err = ipv6_addr_label_init()) < 0) {
4309 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n",
4314 register_pernet_subsys(&addrconf_ops);
4316 /* The addrconf netdev notifier requires that loopback_dev
4317 * has it's ipv6 private information allocated and setup
4318 * before it can bring up and give link-local addresses
4319 * to other devices which are up.
4321 * Unfortunately, loopback_dev is not necessarily the first
4322 * entry in the global dev_base list of net devices. In fact,
4323 * it is likely to be the very last entry on that list.
4324 * So this causes the notifier registry below to try and
4325 * give link-local addresses to all devices besides loopback_dev
4326 * first, then loopback_dev, which cases all the non-loopback_dev
4327 * devices to fail to get a link-local address.
4329 * So, as a temporary fix, allocate the ipv6 structure for
4330 * loopback_dev first by hand.
4331 * Longer term, all of the dependencies ipv6 has upon the loopback
4332 * device and it being up should be removed.
4335 if (!ipv6_add_dev(init_net.loopback_dev))
4341 err = register_pernet_device(&addrconf_net_ops);
4345 register_netdevice_notifier(&ipv6_dev_notf);
4349 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4353 /* Only the first call to __rtnl_register can fail */
4354 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4355 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4356 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4357 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4358 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4360 ipv6_addr_label_rtnl_register();
4364 unregister_netdevice_notifier(&ipv6_dev_notf);
4366 unregister_pernet_subsys(&addrconf_ops);
4371 void addrconf_cleanup(void)
4373 struct inet6_ifaddr *ifa;
4376 unregister_netdevice_notifier(&ipv6_dev_notf);
4377 unregister_pernet_device(&addrconf_net_ops);
4379 unregister_pernet_subsys(&addrconf_ops);
4386 write_lock_bh(&addrconf_hash_lock);
4387 for (i=0; i < IN6_ADDR_HSIZE; i++) {
4388 for (ifa=inet6_addr_lst[i]; ifa; ) {
4389 struct inet6_ifaddr *bifa;
4392 ifa = ifa->lst_next;
4393 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4394 /* Do not free it; something is wrong.
4395 Now we can investigate it with debugger.
4399 write_unlock_bh(&addrconf_hash_lock);
4401 del_timer(&addr_chk_timer);
4404 unregister_pernet_subsys(&addrconf_net_ops);