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;
784 write_lock(&idev->lock);
786 spin_lock_bh(&ift->lock);
787 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
788 spin_unlock_bh(&ift->lock);
795 if (idev->cnf.use_tempaddr <= 0) {
796 write_unlock(&idev->lock);
798 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
803 spin_lock_bh(&ifp->lock);
804 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
805 idev->cnf.use_tempaddr = -1; /*XXX*/
806 spin_unlock_bh(&ifp->lock);
807 write_unlock(&idev->lock);
809 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
815 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
816 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
817 spin_unlock_bh(&ifp->lock);
818 write_unlock(&idev->lock);
820 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
826 memcpy(&addr.s6_addr[8], idev->rndid, 8);
827 tmp_valid_lft = min_t(__u32,
829 idev->cnf.temp_valid_lft);
830 tmp_prefered_lft = min_t(__u32,
832 idev->cnf.temp_prefered_lft - desync_factor / HZ);
833 tmp_plen = ifp->prefix_len;
834 max_addresses = idev->cnf.max_addresses;
835 tmp_cstamp = ifp->cstamp;
836 tmp_tstamp = ifp->tstamp;
837 spin_unlock_bh(&ifp->lock);
839 write_unlock(&idev->lock);
841 addr_flags = IFA_F_TEMPORARY;
842 /* set in addrconf_prefix_rcv() */
843 if (ifp->flags & IFA_F_OPTIMISTIC)
844 addr_flags |= IFA_F_OPTIMISTIC;
846 ift = !max_addresses ||
847 ipv6_count_addresses(idev) < max_addresses ?
848 ipv6_add_addr(idev, &addr, tmp_plen,
849 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
851 if (!ift || IS_ERR(ift)) {
855 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
857 write_lock(&idev->lock);
861 spin_lock_bh(&ift->lock);
863 ift->valid_lft = tmp_valid_lft;
864 ift->prefered_lft = tmp_prefered_lft;
865 ift->cstamp = tmp_cstamp;
866 ift->tstamp = tmp_tstamp;
867 spin_unlock_bh(&ift->lock);
869 addrconf_dad_start(ift, 0);
878 * Choose an appropriate source address (RFC3484)
881 IPV6_SADDR_RULE_INIT = 0,
882 IPV6_SADDR_RULE_LOCAL,
883 IPV6_SADDR_RULE_SCOPE,
884 IPV6_SADDR_RULE_PREFERRED,
885 #ifdef CONFIG_IPV6_MIP6
889 IPV6_SADDR_RULE_LABEL,
890 #ifdef CONFIG_IPV6_PRIVACY
891 IPV6_SADDR_RULE_PRIVACY,
893 IPV6_SADDR_RULE_ORCHID,
894 IPV6_SADDR_RULE_PREFIX,
898 struct ipv6_saddr_score {
901 struct inet6_ifaddr *ifa;
902 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
907 struct ipv6_saddr_dst {
908 struct in6_addr *addr;
915 static inline int ipv6_saddr_preferred(int type)
917 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
918 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
923 static int ipv6_get_saddr_eval(struct ipv6_saddr_score *score,
924 struct ipv6_saddr_dst *dst,
929 if (i <= score->rule) {
931 case IPV6_SADDR_RULE_SCOPE:
932 ret = score->scopedist;
934 case IPV6_SADDR_RULE_PREFIX:
935 ret = score->matchlen;
938 ret = !!test_bit(i, score->scorebits);
944 case IPV6_SADDR_RULE_INIT:
945 /* Rule 0: remember if hiscore is not ready yet */
948 case IPV6_SADDR_RULE_LOCAL:
949 /* Rule 1: Prefer same address */
950 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
952 case IPV6_SADDR_RULE_SCOPE:
953 /* Rule 2: Prefer appropriate scope
958 * ---+--+-+---> scope
960 * | d is scope of the destination.
962 * | \ <- smaller scope is better if
963 * B-15 | \ if scope is enough for destinaion.
964 * | ret = B - scope (-1 <= scope >= d <= 15).
966 * |/ <- greater is better
967 * -C / if scope is not enough for destination.
968 * /| ret = scope - C (-1 <= d < scope <= 15).
970 * d - C - 1 < B -15 (for all -1 <= d <= 15).
971 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
972 * Assume B = 0 and we get C > 29.
974 ret = __ipv6_addr_src_scope(score->addr_type);
975 if (ret >= dst->scope)
978 ret -= 128; /* 30 is enough */
979 score->scopedist = ret;
981 case IPV6_SADDR_RULE_PREFERRED:
982 /* Rule 3: Avoid deprecated and optimistic addresses */
983 ret = ipv6_saddr_preferred(score->addr_type) ||
984 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
986 #ifdef CONFIG_IPV6_MIP6
987 case IPV6_SADDR_RULE_HOA:
989 /* Rule 4: Prefer home address */
990 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
991 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
995 case IPV6_SADDR_RULE_OIF:
996 /* Rule 5: Prefer outgoing interface */
997 ret = (!dst->ifindex ||
998 dst->ifindex == score->ifa->idev->dev->ifindex);
1000 case IPV6_SADDR_RULE_LABEL:
1001 /* Rule 6: Prefer matching label */
1002 ret = ipv6_addr_label(&score->ifa->addr, score->addr_type,
1003 score->ifa->idev->dev->ifindex) == dst->label;
1005 #ifdef CONFIG_IPV6_PRIVACY
1006 case IPV6_SADDR_RULE_PRIVACY:
1008 /* Rule 7: Prefer public address
1009 * Note: prefer temprary address if use_tempaddr >= 2
1011 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1012 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1013 score->ifa->idev->cnf.use_tempaddr >= 2;
1014 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1018 case IPV6_SADDR_RULE_ORCHID:
1019 /* Rule 8-: Prefer ORCHID vs ORCHID or
1020 * non-ORCHID vs non-ORCHID
1022 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1023 ipv6_addr_orchid(dst->addr));
1025 case IPV6_SADDR_RULE_PREFIX:
1026 /* Rule 8: Use longest matching prefix */
1027 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1035 __set_bit(i, score->scorebits);
1041 int ipv6_dev_get_saddr(struct net_device *dst_dev,
1042 struct in6_addr *daddr, unsigned int prefs,
1043 struct in6_addr *saddr)
1045 struct ipv6_saddr_score scores[2],
1046 *score = &scores[0], *hiscore = &scores[1];
1047 struct net *net = dev_net(dst_dev);
1048 struct ipv6_saddr_dst dst;
1049 struct net_device *dev;
1052 dst_type = __ipv6_addr_type(daddr);
1054 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1055 dst.scope = __ipv6_addr_src_scope(dst_type);
1056 dst.label = ipv6_addr_label(daddr, dst_type, dst.ifindex);
1060 hiscore->ifa = NULL;
1062 read_lock(&dev_base_lock);
1065 for_each_netdev(net, dev) {
1066 struct inet6_dev *idev;
1068 /* Candidate Source Address (section 4)
1069 * - multicast and link-local destination address,
1070 * the set of candidate source address MUST only
1071 * include addresses assigned to interfaces
1072 * belonging to the same link as the outgoing
1074 * (- For site-local destination addresses, the
1075 * set of candidate source addresses MUST only
1076 * include addresses assigned to interfaces
1077 * belonging to the same site as the outgoing
1080 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1081 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1082 dst.ifindex && dev->ifindex != dst.ifindex)
1085 idev = __in6_dev_get(dev);
1089 read_lock_bh(&idev->lock);
1090 for (score->ifa = idev->addr_list; score->ifa; score->ifa = score->ifa->if_next) {
1094 * - Tentative Address (RFC2462 section 5.4)
1095 * - A tentative address is not considered
1096 * "assigned to an interface" in the traditional
1097 * sense, unless it is also flagged as optimistic.
1098 * - Candidate Source Address (section 4)
1099 * - In any case, anycast addresses, multicast
1100 * addresses, and the unspecified address MUST
1101 * NOT be included in a candidate set.
1103 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1104 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1107 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1109 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1110 score->addr_type & IPV6_ADDR_MULTICAST)) {
1111 LIMIT_NETDEBUG(KERN_DEBUG
1112 "ADDRCONF: unspecified / multicast address "
1113 "assigned as unicast address on %s",
1119 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1121 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1122 int minihiscore, miniscore;
1124 minihiscore = ipv6_get_saddr_eval(hiscore, &dst, i);
1125 miniscore = ipv6_get_saddr_eval(score, &dst, i);
1127 if (minihiscore > miniscore) {
1128 if (i == IPV6_SADDR_RULE_SCOPE &&
1129 score->scopedist > 0) {
1132 * each remaining entry
1133 * has too small (not enough)
1134 * scope, because ifa entries
1135 * are sorted by their scope
1141 } else if (minihiscore < miniscore) {
1142 struct ipv6_saddr_score *tmp;
1145 in6_ifa_put(hiscore->ifa);
1147 in6_ifa_hold(score->ifa);
1153 /* restore our iterator */
1154 score->ifa = hiscore->ifa;
1161 read_unlock_bh(&idev->lock);
1164 read_unlock(&dev_base_lock);
1167 return -EADDRNOTAVAIL;
1169 ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1170 in6_ifa_put(hiscore->ifa);
1174 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1176 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1177 unsigned char banned_flags)
1179 struct inet6_dev *idev;
1180 int err = -EADDRNOTAVAIL;
1183 if ((idev = __in6_dev_get(dev)) != NULL) {
1184 struct inet6_ifaddr *ifp;
1186 read_lock_bh(&idev->lock);
1187 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1188 if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1189 ipv6_addr_copy(addr, &ifp->addr);
1194 read_unlock_bh(&idev->lock);
1200 static int ipv6_count_addresses(struct inet6_dev *idev)
1203 struct inet6_ifaddr *ifp;
1205 read_lock_bh(&idev->lock);
1206 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1208 read_unlock_bh(&idev->lock);
1212 int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1213 struct net_device *dev, int strict)
1215 struct inet6_ifaddr * ifp;
1216 u8 hash = ipv6_addr_hash(addr);
1218 read_lock_bh(&addrconf_hash_lock);
1219 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1220 if (!net_eq(dev_net(ifp->idev->dev), net))
1222 if (ipv6_addr_equal(&ifp->addr, addr) &&
1223 !(ifp->flags&IFA_F_TENTATIVE)) {
1224 if (dev == NULL || ifp->idev->dev == dev ||
1225 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1229 read_unlock_bh(&addrconf_hash_lock);
1232 EXPORT_SYMBOL(ipv6_chk_addr);
1235 int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1236 struct net_device *dev)
1238 struct inet6_ifaddr * ifp;
1239 u8 hash = ipv6_addr_hash(addr);
1241 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1242 if (!net_eq(dev_net(ifp->idev->dev), net))
1244 if (ipv6_addr_equal(&ifp->addr, addr)) {
1245 if (dev == NULL || ifp->idev->dev == dev)
1252 int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev)
1254 struct inet6_dev *idev;
1255 struct inet6_ifaddr *ifa;
1260 idev = __in6_dev_get(dev);
1262 read_lock_bh(&idev->lock);
1263 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
1264 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1269 read_unlock_bh(&idev->lock);
1275 EXPORT_SYMBOL(ipv6_chk_prefix);
1277 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, struct in6_addr *addr,
1278 struct net_device *dev, int strict)
1280 struct inet6_ifaddr * ifp;
1281 u8 hash = ipv6_addr_hash(addr);
1283 read_lock_bh(&addrconf_hash_lock);
1284 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1285 if (!net_eq(dev_net(ifp->idev->dev), net))
1287 if (ipv6_addr_equal(&ifp->addr, addr)) {
1288 if (dev == NULL || ifp->idev->dev == dev ||
1289 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1295 read_unlock_bh(&addrconf_hash_lock);
1300 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1302 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1303 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
1304 __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1305 __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1306 int sk_ipv6only = ipv6_only_sock(sk);
1307 int sk2_ipv6only = inet_v6_ipv6only(sk2);
1308 int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1309 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1311 if (!sk2_rcv_saddr && !sk_ipv6only)
1314 if (addr_type2 == IPV6_ADDR_ANY &&
1315 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1318 if (addr_type == IPV6_ADDR_ANY &&
1319 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1322 if (sk2_rcv_saddr6 &&
1323 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1326 if (addr_type == IPV6_ADDR_MAPPED &&
1328 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1334 /* Gets referenced address, destroys ifaddr */
1336 static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1338 if (ifp->flags&IFA_F_PERMANENT) {
1339 spin_lock_bh(&ifp->lock);
1340 addrconf_del_timer(ifp);
1341 ifp->flags |= IFA_F_TENTATIVE;
1342 spin_unlock_bh(&ifp->lock);
1344 #ifdef CONFIG_IPV6_PRIVACY
1345 } else if (ifp->flags&IFA_F_TEMPORARY) {
1346 struct inet6_ifaddr *ifpub;
1347 spin_lock_bh(&ifp->lock);
1350 in6_ifa_hold(ifpub);
1351 spin_unlock_bh(&ifp->lock);
1352 ipv6_create_tempaddr(ifpub, ifp);
1355 spin_unlock_bh(&ifp->lock);
1363 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1365 if (net_ratelimit())
1366 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1367 addrconf_dad_stop(ifp);
1370 /* Join to solicited addr multicast group. */
1372 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1374 struct in6_addr maddr;
1376 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1379 addrconf_addr_solict_mult(addr, &maddr);
1380 ipv6_dev_mc_inc(dev, &maddr);
1383 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1385 struct in6_addr maddr;
1387 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1390 addrconf_addr_solict_mult(addr, &maddr);
1391 __ipv6_dev_mc_dec(idev, &maddr);
1394 static void addrconf_join_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_inc(ifp->idev->dev, &addr);
1403 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1405 struct in6_addr addr;
1406 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1407 if (ipv6_addr_any(&addr))
1409 __ipv6_dev_ac_dec(ifp->idev, &addr);
1412 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1414 if (dev->addr_len != ETH_ALEN)
1416 memcpy(eui, dev->dev_addr, 3);
1417 memcpy(eui + 5, dev->dev_addr + 3, 3);
1420 * The zSeries OSA network cards can be shared among various
1421 * OS instances, but the OSA cards have only one MAC address.
1422 * This leads to duplicate address conflicts in conjunction
1423 * with IPv6 if more than one instance uses the same card.
1425 * The driver for these cards can deliver a unique 16-bit
1426 * identifier for each instance sharing the same card. It is
1427 * placed instead of 0xFFFE in the interface identifier. The
1428 * "u" bit of the interface identifier is not inverted in this
1429 * case. Hence the resulting interface identifier has local
1430 * scope according to RFC2373.
1433 eui[3] = (dev->dev_id >> 8) & 0xFF;
1434 eui[4] = dev->dev_id & 0xFF;
1443 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1445 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1446 if (dev->addr_len != ARCNET_ALEN)
1449 eui[7] = *(u8*)dev->dev_addr;
1453 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1455 if (dev->addr_len != INFINIBAND_ALEN)
1457 memcpy(eui, dev->dev_addr + 12, 8);
1462 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1464 switch (dev->type) {
1467 case ARPHRD_IEEE802_TR:
1468 return addrconf_ifid_eui48(eui, dev);
1470 return addrconf_ifid_arcnet(eui, dev);
1471 case ARPHRD_INFINIBAND:
1472 return addrconf_ifid_infiniband(eui, dev);
1474 if (dev->priv_flags & IFF_ISATAP)
1475 return ipv6_isatap_eui64(eui, *(__be32 *)dev->dev_addr);
1480 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1483 struct inet6_ifaddr *ifp;
1485 read_lock_bh(&idev->lock);
1486 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1487 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1488 memcpy(eui, ifp->addr.s6_addr+8, 8);
1493 read_unlock_bh(&idev->lock);
1497 #ifdef CONFIG_IPV6_PRIVACY
1498 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1499 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1502 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1503 idev->rndid[0] &= ~0x02;
1506 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1507 * check if generated address is not inappropriate
1509 * - Reserved subnet anycast (RFC 2526)
1510 * 11111101 11....11 1xxxxxxx
1511 * - ISATAP (RFC4214) 6.1
1512 * 00-00-5E-FE-xx-xx-xx-xx
1514 * - XXX: already assigned to an address on the device
1516 if (idev->rndid[0] == 0xfd &&
1517 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1518 (idev->rndid[7]&0x80))
1520 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1521 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1523 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1530 static void ipv6_regen_rndid(unsigned long data)
1532 struct inet6_dev *idev = (struct inet6_dev *) data;
1533 unsigned long expires;
1536 write_lock_bh(&idev->lock);
1541 if (__ipv6_regen_rndid(idev) < 0)
1545 idev->cnf.temp_prefered_lft * HZ -
1546 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1547 if (time_before(expires, jiffies)) {
1549 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1554 if (!mod_timer(&idev->regen_timer, expires))
1558 write_unlock_bh(&idev->lock);
1559 rcu_read_unlock_bh();
1563 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1566 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1567 ret = __ipv6_regen_rndid(idev);
1577 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1578 unsigned long expires, u32 flags)
1580 struct fib6_config cfg = {
1581 .fc_table = RT6_TABLE_PREFIX,
1582 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1583 .fc_ifindex = dev->ifindex,
1584 .fc_expires = expires,
1586 .fc_flags = RTF_UP | flags,
1587 .fc_nlinfo.nl_net = dev_net(dev),
1590 ipv6_addr_copy(&cfg.fc_dst, pfx);
1592 /* Prevent useless cloning on PtP SIT.
1593 This thing is done here expecting that the whole
1594 class of non-broadcast devices need not cloning.
1596 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1597 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1598 cfg.fc_flags |= RTF_NONEXTHOP;
1601 ip6_route_add(&cfg);
1604 /* Create "default" multicast route to the interface */
1606 static void addrconf_add_mroute(struct net_device *dev)
1608 struct fib6_config cfg = {
1609 .fc_table = RT6_TABLE_LOCAL,
1610 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1611 .fc_ifindex = dev->ifindex,
1614 .fc_nlinfo.nl_net = dev_net(dev),
1617 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1619 ip6_route_add(&cfg);
1622 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1623 static void sit_route_add(struct net_device *dev)
1625 struct fib6_config cfg = {
1626 .fc_table = RT6_TABLE_MAIN,
1627 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1628 .fc_ifindex = dev->ifindex,
1630 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1631 .fc_nlinfo.nl_net = dev_net(dev),
1634 /* prefix length - 96 bits "::d.d.d.d" */
1635 ip6_route_add(&cfg);
1639 static void addrconf_add_lroute(struct net_device *dev)
1641 struct in6_addr addr;
1643 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1644 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1647 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1649 struct inet6_dev *idev;
1653 if ((idev = ipv6_find_idev(dev)) == NULL)
1656 /* Add default multicast route */
1657 addrconf_add_mroute(dev);
1659 /* Add link local route */
1660 addrconf_add_lroute(dev);
1664 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1666 struct prefix_info *pinfo;
1670 unsigned long rt_expires;
1671 struct inet6_dev *in6_dev;
1673 pinfo = (struct prefix_info *) opt;
1675 if (len < sizeof(struct prefix_info)) {
1676 ADBG(("addrconf: prefix option too short\n"));
1681 * Validation checks ([ADDRCONF], page 19)
1684 addr_type = ipv6_addr_type(&pinfo->prefix);
1686 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1689 valid_lft = ntohl(pinfo->valid);
1690 prefered_lft = ntohl(pinfo->prefered);
1692 if (prefered_lft > valid_lft) {
1693 if (net_ratelimit())
1694 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1698 in6_dev = in6_dev_get(dev);
1700 if (in6_dev == NULL) {
1701 if (net_ratelimit())
1702 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1707 * Two things going on here:
1708 * 1) Add routes for on-link prefixes
1709 * 2) Configure prefixes with the auto flag set
1712 /* Avoid arithmetic overflow. Really, we could
1713 save rt_expires in seconds, likely valid_lft,
1714 but it would require division in fib gc, that it
1717 if (valid_lft >= 0x7FFFFFFF/HZ)
1718 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1720 rt_expires = valid_lft * HZ;
1723 * We convert this (in jiffies) to clock_t later.
1724 * Avoid arithmetic overflow there as well.
1725 * Overflow can happen only if HZ < USER_HZ.
1727 if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1728 rt_expires = 0x7FFFFFFF / USER_HZ;
1730 if (pinfo->onlink) {
1731 struct rt6_info *rt;
1732 rt = rt6_lookup(dev_net(dev), &pinfo->prefix, NULL,
1735 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1736 if (rt->rt6i_flags&RTF_EXPIRES) {
1737 if (valid_lft == 0) {
1741 rt->rt6i_expires = jiffies + rt_expires;
1744 } else if (valid_lft) {
1745 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1746 dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1749 dst_release(&rt->u.dst);
1752 /* Try to figure out our local address for this prefix */
1754 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1755 struct inet6_ifaddr * ifp;
1756 struct in6_addr addr;
1757 int create = 0, update_lft = 0;
1759 if (pinfo->prefix_len == 64) {
1760 memcpy(&addr, &pinfo->prefix, 8);
1761 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1762 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1763 in6_dev_put(in6_dev);
1768 if (net_ratelimit())
1769 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1771 in6_dev_put(in6_dev);
1776 ifp = ipv6_get_ifaddr(dev_net(dev), &addr, dev, 1);
1778 if (ifp == NULL && valid_lft) {
1779 int max_addresses = in6_dev->cnf.max_addresses;
1782 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1783 if (in6_dev->cnf.optimistic_dad &&
1784 !ipv6_devconf.forwarding)
1785 addr_flags = IFA_F_OPTIMISTIC;
1788 /* Do not allow to create too much of autoconfigured
1789 * addresses; this would be too easy way to crash kernel.
1791 if (!max_addresses ||
1792 ipv6_count_addresses(in6_dev) < max_addresses)
1793 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1794 addr_type&IPV6_ADDR_SCOPE_MASK,
1797 if (!ifp || IS_ERR(ifp)) {
1798 in6_dev_put(in6_dev);
1802 update_lft = create = 1;
1803 ifp->cstamp = jiffies;
1804 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1810 #ifdef CONFIG_IPV6_PRIVACY
1811 struct inet6_ifaddr *ift;
1815 /* update lifetime (RFC2462 5.5.3 e) */
1816 spin_lock(&ifp->lock);
1818 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1819 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1822 if (!update_lft && stored_lft) {
1823 if (valid_lft > MIN_VALID_LIFETIME ||
1824 valid_lft > stored_lft)
1826 else if (stored_lft <= MIN_VALID_LIFETIME) {
1827 /* valid_lft <= stored_lft is always true */
1831 valid_lft = MIN_VALID_LIFETIME;
1832 if (valid_lft < prefered_lft)
1833 prefered_lft = valid_lft;
1839 ifp->valid_lft = valid_lft;
1840 ifp->prefered_lft = prefered_lft;
1843 ifp->flags &= ~IFA_F_DEPRECATED;
1844 spin_unlock(&ifp->lock);
1846 if (!(flags&IFA_F_TENTATIVE))
1847 ipv6_ifa_notify(0, ifp);
1849 spin_unlock(&ifp->lock);
1851 #ifdef CONFIG_IPV6_PRIVACY
1852 read_lock_bh(&in6_dev->lock);
1853 /* update all temporary addresses in the list */
1854 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1856 * When adjusting the lifetimes of an existing
1857 * temporary address, only lower the lifetimes.
1858 * Implementations must not increase the
1859 * lifetimes of an existing temporary address
1860 * when processing a Prefix Information Option.
1862 spin_lock(&ift->lock);
1864 if (ift->valid_lft > valid_lft &&
1865 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1866 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1867 if (ift->prefered_lft > prefered_lft &&
1868 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1869 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1870 spin_unlock(&ift->lock);
1871 if (!(flags&IFA_F_TENTATIVE))
1872 ipv6_ifa_notify(0, ift);
1875 if (create && in6_dev->cnf.use_tempaddr > 0) {
1877 * When a new public address is created as described in [ADDRCONF],
1878 * also create a new temporary address.
1880 read_unlock_bh(&in6_dev->lock);
1881 ipv6_create_tempaddr(ifp, NULL);
1883 read_unlock_bh(&in6_dev->lock);
1890 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1891 in6_dev_put(in6_dev);
1895 * Set destination address.
1896 * Special case for SIT interfaces where we create a new "virtual"
1899 int addrconf_set_dstaddr(struct net *net, void __user *arg)
1901 struct in6_ifreq ireq;
1902 struct net_device *dev;
1908 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1911 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1917 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1918 if (dev->type == ARPHRD_SIT) {
1921 struct ip_tunnel_parm p;
1923 err = -EADDRNOTAVAIL;
1924 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1927 memset(&p, 0, sizeof(p));
1928 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1932 p.iph.protocol = IPPROTO_IPV6;
1934 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1936 oldfs = get_fs(); set_fs(KERNEL_DS);
1937 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1942 dev = __dev_get_by_name(net, p.name);
1945 err = dev_open(dev);
1956 * Manual configuration of address on an interface
1958 static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx,
1959 int plen, __u8 ifa_flags, __u32 prefered_lft,
1962 struct inet6_ifaddr *ifp;
1963 struct inet6_dev *idev;
1964 struct net_device *dev;
1966 u32 flags = RTF_EXPIRES;
1970 /* check the lifetime */
1971 if (!valid_lft || prefered_lft > valid_lft)
1974 dev = __dev_get_by_index(net, ifindex);
1978 if ((idev = addrconf_add_dev(dev)) == NULL)
1981 scope = ipv6_addr_scope(pfx);
1983 if (valid_lft == INFINITY_LIFE_TIME) {
1984 ifa_flags |= IFA_F_PERMANENT;
1986 } else if (valid_lft >= 0x7FFFFFFF/HZ)
1987 valid_lft = 0x7FFFFFFF/HZ;
1989 if (prefered_lft == 0)
1990 ifa_flags |= IFA_F_DEPRECATED;
1991 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
1992 (prefered_lft != INFINITY_LIFE_TIME))
1993 prefered_lft = 0x7FFFFFFF/HZ;
1995 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
1998 spin_lock_bh(&ifp->lock);
1999 ifp->valid_lft = valid_lft;
2000 ifp->prefered_lft = prefered_lft;
2001 ifp->tstamp = jiffies;
2002 spin_unlock_bh(&ifp->lock);
2004 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2005 jiffies_to_clock_t(valid_lft * HZ), flags);
2007 * Note that section 3.1 of RFC 4429 indicates
2008 * that the Optimistic flag should not be set for
2009 * manually configured addresses
2011 addrconf_dad_start(ifp, 0);
2017 return PTR_ERR(ifp);
2020 static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx,
2023 struct inet6_ifaddr *ifp;
2024 struct inet6_dev *idev;
2025 struct net_device *dev;
2027 dev = __dev_get_by_index(net, ifindex);
2031 if ((idev = __in6_dev_get(dev)) == NULL)
2034 read_lock_bh(&idev->lock);
2035 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
2036 if (ifp->prefix_len == plen &&
2037 ipv6_addr_equal(pfx, &ifp->addr)) {
2039 read_unlock_bh(&idev->lock);
2043 /* If the last address is deleted administratively,
2044 disable IPv6 on this interface.
2046 if (idev->addr_list == NULL)
2047 addrconf_ifdown(idev->dev, 1);
2051 read_unlock_bh(&idev->lock);
2052 return -EADDRNOTAVAIL;
2056 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2058 struct in6_ifreq ireq;
2061 if (!capable(CAP_NET_ADMIN))
2064 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2068 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2069 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2070 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2075 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2077 struct in6_ifreq ireq;
2080 if (!capable(CAP_NET_ADMIN))
2083 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2087 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2088 ireq.ifr6_prefixlen);
2093 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2094 static void sit_add_v4_addrs(struct inet6_dev *idev)
2096 struct inet6_ifaddr * ifp;
2097 struct in6_addr addr;
2098 struct net_device *dev;
2099 struct net *net = dev_net(idev->dev);
2104 memset(&addr, 0, sizeof(struct in6_addr));
2105 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2107 if (idev->dev->flags&IFF_POINTOPOINT) {
2108 addr.s6_addr32[0] = htonl(0xfe800000);
2111 scope = IPV6_ADDR_COMPATv4;
2114 if (addr.s6_addr32[3]) {
2115 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
2117 spin_lock_bh(&ifp->lock);
2118 ifp->flags &= ~IFA_F_TENTATIVE;
2119 spin_unlock_bh(&ifp->lock);
2120 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2126 for_each_netdev(net, dev) {
2127 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2128 if (in_dev && (dev->flags & IFF_UP)) {
2129 struct in_ifaddr * ifa;
2133 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2136 addr.s6_addr32[3] = ifa->ifa_local;
2138 if (ifa->ifa_scope == RT_SCOPE_LINK)
2140 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2141 if (idev->dev->flags&IFF_POINTOPOINT)
2145 if (idev->dev->flags&IFF_POINTOPOINT)
2150 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2153 spin_lock_bh(&ifp->lock);
2154 ifp->flags &= ~IFA_F_TENTATIVE;
2155 spin_unlock_bh(&ifp->lock);
2156 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2165 static void init_loopback(struct net_device *dev)
2167 struct inet6_dev *idev;
2168 struct inet6_ifaddr * ifp;
2174 if ((idev = ipv6_find_idev(dev)) == NULL) {
2175 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2179 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2181 spin_lock_bh(&ifp->lock);
2182 ifp->flags &= ~IFA_F_TENTATIVE;
2183 spin_unlock_bh(&ifp->lock);
2184 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2189 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2191 struct inet6_ifaddr * ifp;
2192 u32 addr_flags = IFA_F_PERMANENT;
2194 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2195 if (idev->cnf.optimistic_dad &&
2196 !ipv6_devconf.forwarding)
2197 addr_flags |= IFA_F_OPTIMISTIC;
2201 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2203 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2204 addrconf_dad_start(ifp, 0);
2209 static void addrconf_dev_config(struct net_device *dev)
2211 struct in6_addr addr;
2212 struct inet6_dev * idev;
2216 if ((dev->type != ARPHRD_ETHER) &&
2217 (dev->type != ARPHRD_FDDI) &&
2218 (dev->type != ARPHRD_IEEE802_TR) &&
2219 (dev->type != ARPHRD_ARCNET) &&
2220 (dev->type != ARPHRD_INFINIBAND)) {
2221 /* Alas, we support only Ethernet autoconfiguration. */
2225 idev = addrconf_add_dev(dev);
2229 memset(&addr, 0, sizeof(struct in6_addr));
2230 addr.s6_addr32[0] = htonl(0xFE800000);
2232 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2233 addrconf_add_linklocal(idev, &addr);
2236 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2237 static void addrconf_sit_config(struct net_device *dev)
2239 struct inet6_dev *idev;
2244 * Configure the tunnel with one of our IPv4
2245 * addresses... we should configure all of
2246 * our v4 addrs in the tunnel
2249 if ((idev = ipv6_find_idev(dev)) == NULL) {
2250 printk(KERN_DEBUG "init sit: add_dev failed\n");
2254 if (dev->priv_flags & IFF_ISATAP) {
2255 struct in6_addr addr;
2257 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2258 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2259 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2260 addrconf_add_linklocal(idev, &addr);
2264 sit_add_v4_addrs(idev);
2266 if (dev->flags&IFF_POINTOPOINT) {
2267 addrconf_add_mroute(dev);
2268 addrconf_add_lroute(dev);
2275 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2277 struct in6_addr lladdr;
2279 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2280 addrconf_add_linklocal(idev, &lladdr);
2286 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2288 struct net_device *link_dev;
2289 struct net *net = dev_net(idev->dev);
2291 /* first try to inherit the link-local address from the link device */
2292 if (idev->dev->iflink &&
2293 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2294 if (!ipv6_inherit_linklocal(idev, link_dev))
2297 /* then try to inherit it from any device */
2298 for_each_netdev(net, link_dev) {
2299 if (!ipv6_inherit_linklocal(idev, link_dev))
2302 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2306 * Autoconfigure tunnel with a link-local address so routing protocols,
2307 * DHCPv6, MLD etc. can be run over the virtual link
2310 static void addrconf_ip6_tnl_config(struct net_device *dev)
2312 struct inet6_dev *idev;
2316 if ((idev = addrconf_add_dev(dev)) == NULL) {
2317 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2320 ip6_tnl_add_linklocal(idev);
2323 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2326 struct net_device *dev = (struct net_device *) data;
2327 struct inet6_dev *idev = __in6_dev_get(dev);
2328 int run_pending = 0;
2332 case NETDEV_REGISTER:
2333 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2334 idev = ipv6_add_dev(dev);
2336 return notifier_from_errno(-ENOMEM);
2341 if (dev->flags & IFF_SLAVE)
2344 if (event == NETDEV_UP) {
2345 if (!addrconf_qdisc_ok(dev)) {
2346 /* device is not ready yet. */
2348 "ADDRCONF(NETDEV_UP): %s: "
2349 "link is not ready\n",
2354 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2355 idev = ipv6_add_dev(dev);
2358 idev->if_flags |= IF_READY;
2360 if (!addrconf_qdisc_ok(dev)) {
2361 /* device is still not ready. */
2366 if (idev->if_flags & IF_READY) {
2367 /* device is already configured. */
2370 idev->if_flags |= IF_READY;
2374 "ADDRCONF(NETDEV_CHANGE): %s: "
2375 "link becomes ready\n",
2382 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2384 addrconf_sit_config(dev);
2387 case ARPHRD_TUNNEL6:
2388 addrconf_ip6_tnl_config(dev);
2390 case ARPHRD_LOOPBACK:
2395 addrconf_dev_config(dev);
2400 addrconf_dad_run(idev);
2402 /* If the MTU changed during the interface down, when the
2403 interface up, the changed MTU must be reflected in the
2404 idev as well as routers.
2406 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2407 rt6_mtu_change(dev, dev->mtu);
2408 idev->cnf.mtu6 = dev->mtu;
2410 idev->tstamp = jiffies;
2411 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2412 /* If the changed mtu during down is lower than IPV6_MIN_MTU
2413 stop IPv6 on this interface.
2415 if (dev->mtu < IPV6_MIN_MTU)
2416 addrconf_ifdown(dev, event != NETDEV_DOWN);
2420 case NETDEV_CHANGEMTU:
2421 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2422 rt6_mtu_change(dev, dev->mtu);
2423 idev->cnf.mtu6 = dev->mtu;
2427 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2428 idev = ipv6_add_dev(dev);
2433 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2436 case NETDEV_UNREGISTER:
2438 * Remove all addresses from this interface.
2440 addrconf_ifdown(dev, event != NETDEV_DOWN);
2443 case NETDEV_CHANGENAME:
2445 snmp6_unregister_dev(idev);
2446 addrconf_sysctl_unregister(idev);
2447 addrconf_sysctl_register(idev);
2448 err = snmp6_register_dev(idev);
2450 return notifier_from_errno(err);
2459 * addrconf module should be notified of a device going up
2461 static struct notifier_block ipv6_dev_notf = {
2462 .notifier_call = addrconf_notify,
2466 static int addrconf_ifdown(struct net_device *dev, int how)
2468 struct inet6_dev *idev;
2469 struct inet6_ifaddr *ifa, **bifa;
2470 struct net *net = dev_net(dev);
2475 if (dev == init_net.loopback_dev && how == 1)
2478 rt6_ifdown(net, dev);
2479 neigh_ifdown(&nd_tbl, dev);
2481 idev = __in6_dev_get(dev);
2485 /* Step 1: remove reference to ipv6 device from parent device.
2491 /* protected by rtnl_lock */
2492 rcu_assign_pointer(dev->ip6_ptr, NULL);
2494 /* Step 1.5: remove snmp6 entry */
2495 snmp6_unregister_dev(idev);
2499 /* Step 2: clear hash table */
2500 for (i=0; i<IN6_ADDR_HSIZE; i++) {
2501 bifa = &inet6_addr_lst[i];
2503 write_lock_bh(&addrconf_hash_lock);
2504 while ((ifa = *bifa) != NULL) {
2505 if (ifa->idev == idev) {
2506 *bifa = ifa->lst_next;
2507 ifa->lst_next = NULL;
2508 addrconf_del_timer(ifa);
2512 bifa = &ifa->lst_next;
2514 write_unlock_bh(&addrconf_hash_lock);
2517 write_lock_bh(&idev->lock);
2519 /* Step 3: clear flags for stateless addrconf */
2521 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2523 /* Step 4: clear address list */
2524 #ifdef CONFIG_IPV6_PRIVACY
2525 if (how == 1 && del_timer(&idev->regen_timer))
2528 /* clear tempaddr list */
2529 while ((ifa = idev->tempaddr_list) != NULL) {
2530 idev->tempaddr_list = ifa->tmp_next;
2531 ifa->tmp_next = NULL;
2533 write_unlock_bh(&idev->lock);
2534 spin_lock_bh(&ifa->lock);
2537 in6_ifa_put(ifa->ifpub);
2540 spin_unlock_bh(&ifa->lock);
2542 write_lock_bh(&idev->lock);
2545 while ((ifa = idev->addr_list) != NULL) {
2546 idev->addr_list = ifa->if_next;
2547 ifa->if_next = NULL;
2549 addrconf_del_timer(ifa);
2550 write_unlock_bh(&idev->lock);
2552 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2553 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2556 write_lock_bh(&idev->lock);
2558 write_unlock_bh(&idev->lock);
2560 /* Step 5: Discard multicast list */
2563 ipv6_mc_destroy_dev(idev);
2567 idev->tstamp = jiffies;
2569 /* Shot the device (if unregistered) */
2572 addrconf_sysctl_unregister(idev);
2573 neigh_parms_release(&nd_tbl, idev->nd_parms);
2574 neigh_ifdown(&nd_tbl, dev);
2580 static void addrconf_rs_timer(unsigned long data)
2582 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2584 if (ifp->idev->cnf.forwarding)
2587 if (ifp->idev->if_flags & IF_RA_RCVD) {
2589 * Announcement received after solicitation
2595 spin_lock(&ifp->lock);
2596 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2597 struct in6_addr all_routers;
2599 /* The wait after the last probe can be shorter */
2600 addrconf_mod_timer(ifp, AC_RS,
2601 (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2602 ifp->idev->cnf.rtr_solicit_delay :
2603 ifp->idev->cnf.rtr_solicit_interval);
2604 spin_unlock(&ifp->lock);
2606 ipv6_addr_all_routers(&all_routers);
2608 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2610 spin_unlock(&ifp->lock);
2612 * Note: we do not support deprecated "all on-link"
2613 * assumption any longer.
2615 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2616 ifp->idev->dev->name);
2624 * Duplicate Address Detection
2626 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2628 unsigned long rand_num;
2629 struct inet6_dev *idev = ifp->idev;
2631 if (ifp->flags & IFA_F_OPTIMISTIC)
2634 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2636 ifp->probes = idev->cnf.dad_transmits;
2637 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2640 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2642 struct inet6_dev *idev = ifp->idev;
2643 struct net_device *dev = idev->dev;
2645 addrconf_join_solict(dev, &ifp->addr);
2647 net_srandom(ifp->addr.s6_addr32[3]);
2649 read_lock_bh(&idev->lock);
2652 spin_lock_bh(&ifp->lock);
2654 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2655 !(ifp->flags&IFA_F_TENTATIVE) ||
2656 ifp->flags & IFA_F_NODAD) {
2657 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2658 spin_unlock_bh(&ifp->lock);
2659 read_unlock_bh(&idev->lock);
2661 addrconf_dad_completed(ifp);
2665 if (!(idev->if_flags & IF_READY)) {
2666 spin_unlock_bh(&ifp->lock);
2667 read_unlock_bh(&idev->lock);
2669 * If the defice is not ready:
2670 * - keep it tentative if it is a permanent address.
2671 * - otherwise, kill it.
2674 addrconf_dad_stop(ifp);
2679 * Optimistic nodes can start receiving
2682 if(ifp->flags & IFA_F_OPTIMISTIC)
2683 ip6_ins_rt(ifp->rt);
2685 addrconf_dad_kick(ifp);
2686 spin_unlock_bh(&ifp->lock);
2688 read_unlock_bh(&idev->lock);
2691 static void addrconf_dad_timer(unsigned long data)
2693 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2694 struct inet6_dev *idev = ifp->idev;
2695 struct in6_addr unspec;
2696 struct in6_addr mcaddr;
2698 read_lock_bh(&idev->lock);
2700 read_unlock_bh(&idev->lock);
2703 spin_lock_bh(&ifp->lock);
2704 if (ifp->probes == 0) {
2706 * DAD was successful
2709 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2710 spin_unlock_bh(&ifp->lock);
2711 read_unlock_bh(&idev->lock);
2713 addrconf_dad_completed(ifp);
2719 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2720 spin_unlock_bh(&ifp->lock);
2721 read_unlock_bh(&idev->lock);
2723 /* send a neighbour solicitation for our addr */
2724 memset(&unspec, 0, sizeof(unspec));
2725 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2726 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2731 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2733 struct net_device * dev = ifp->idev->dev;
2736 * Configure the address for reception. Now it is valid.
2739 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2741 /* If added prefix is link local and forwarding is off,
2742 start sending router solicitations.
2745 if (ifp->idev->cnf.forwarding == 0 &&
2746 ifp->idev->cnf.rtr_solicits > 0 &&
2747 (dev->flags&IFF_LOOPBACK) == 0 &&
2748 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2749 struct in6_addr all_routers;
2751 ipv6_addr_all_routers(&all_routers);
2754 * If a host as already performed a random delay
2755 * [...] as part of DAD [...] there is no need
2756 * to delay again before sending the first RS
2758 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2760 spin_lock_bh(&ifp->lock);
2762 ifp->idev->if_flags |= IF_RS_SENT;
2763 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2764 spin_unlock_bh(&ifp->lock);
2768 static void addrconf_dad_run(struct inet6_dev *idev) {
2769 struct inet6_ifaddr *ifp;
2771 read_lock_bh(&idev->lock);
2772 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2773 spin_lock_bh(&ifp->lock);
2774 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2775 spin_unlock_bh(&ifp->lock);
2778 spin_unlock_bh(&ifp->lock);
2779 addrconf_dad_kick(ifp);
2781 read_unlock_bh(&idev->lock);
2784 #ifdef CONFIG_PROC_FS
2785 struct if6_iter_state {
2786 struct seq_net_private p;
2790 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2792 struct inet6_ifaddr *ifa = NULL;
2793 struct if6_iter_state *state = seq->private;
2794 struct net *net = seq_file_net(seq);
2796 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2797 ifa = inet6_addr_lst[state->bucket];
2799 while (ifa && !net_eq(dev_net(ifa->idev->dev), net))
2800 ifa = ifa->lst_next;
2807 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2809 struct if6_iter_state *state = seq->private;
2810 struct net *net = seq_file_net(seq);
2812 ifa = ifa->lst_next;
2815 if (!net_eq(dev_net(ifa->idev->dev), net)) {
2816 ifa = ifa->lst_next;
2821 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2822 ifa = inet6_addr_lst[state->bucket];
2829 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2831 struct inet6_ifaddr *ifa = if6_get_first(seq);
2834 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2836 return pos ? NULL : ifa;
2839 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2840 __acquires(addrconf_hash_lock)
2842 read_lock_bh(&addrconf_hash_lock);
2843 return if6_get_idx(seq, *pos);
2846 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2848 struct inet6_ifaddr *ifa;
2850 ifa = if6_get_next(seq, v);
2855 static void if6_seq_stop(struct seq_file *seq, void *v)
2856 __releases(addrconf_hash_lock)
2858 read_unlock_bh(&addrconf_hash_lock);
2861 static int if6_seq_show(struct seq_file *seq, void *v)
2863 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2865 NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
2867 ifp->idev->dev->ifindex,
2871 ifp->idev->dev->name);
2875 static const struct seq_operations if6_seq_ops = {
2876 .start = if6_seq_start,
2877 .next = if6_seq_next,
2878 .show = if6_seq_show,
2879 .stop = if6_seq_stop,
2882 static int if6_seq_open(struct inode *inode, struct file *file)
2884 return seq_open_net(inode, file, &if6_seq_ops,
2885 sizeof(struct if6_iter_state));
2888 static const struct file_operations if6_fops = {
2889 .owner = THIS_MODULE,
2890 .open = if6_seq_open,
2892 .llseek = seq_lseek,
2893 .release = seq_release_net,
2896 static int if6_proc_net_init(struct net *net)
2898 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
2903 static void if6_proc_net_exit(struct net *net)
2905 proc_net_remove(net, "if_inet6");
2908 static struct pernet_operations if6_proc_net_ops = {
2909 .init = if6_proc_net_init,
2910 .exit = if6_proc_net_exit,
2913 int __init if6_proc_init(void)
2915 return register_pernet_subsys(&if6_proc_net_ops);
2918 void if6_proc_exit(void)
2920 unregister_pernet_subsys(&if6_proc_net_ops);
2922 #endif /* CONFIG_PROC_FS */
2924 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
2925 /* Check if address is a home address configured on any interface. */
2926 int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
2929 struct inet6_ifaddr * ifp;
2930 u8 hash = ipv6_addr_hash(addr);
2931 read_lock_bh(&addrconf_hash_lock);
2932 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
2933 if (!net_eq(dev_net(ifp->idev->dev), net))
2935 if (ipv6_addr_cmp(&ifp->addr, addr) == 0 &&
2936 (ifp->flags & IFA_F_HOMEADDRESS)) {
2941 read_unlock_bh(&addrconf_hash_lock);
2947 * Periodic address status verification
2950 static void addrconf_verify(unsigned long foo)
2952 struct inet6_ifaddr *ifp;
2953 unsigned long now, next;
2956 spin_lock_bh(&addrconf_verify_lock);
2958 next = now + ADDR_CHECK_FREQUENCY;
2960 del_timer(&addr_chk_timer);
2962 for (i=0; i < IN6_ADDR_HSIZE; i++) {
2965 read_lock(&addrconf_hash_lock);
2966 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2968 #ifdef CONFIG_IPV6_PRIVACY
2969 unsigned long regen_advance;
2972 if (ifp->flags & IFA_F_PERMANENT)
2975 spin_lock(&ifp->lock);
2976 age = (now - ifp->tstamp) / HZ;
2978 #ifdef CONFIG_IPV6_PRIVACY
2979 regen_advance = ifp->idev->cnf.regen_max_retry *
2980 ifp->idev->cnf.dad_transmits *
2981 ifp->idev->nd_parms->retrans_time / HZ;
2984 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
2985 age >= ifp->valid_lft) {
2986 spin_unlock(&ifp->lock);
2988 read_unlock(&addrconf_hash_lock);
2991 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
2992 spin_unlock(&ifp->lock);
2994 } else if (age >= ifp->prefered_lft) {
2995 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2998 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3000 ifp->flags |= IFA_F_DEPRECATED;
3003 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3004 next = ifp->tstamp + ifp->valid_lft * HZ;
3006 spin_unlock(&ifp->lock);
3010 read_unlock(&addrconf_hash_lock);
3012 ipv6_ifa_notify(0, ifp);
3016 #ifdef CONFIG_IPV6_PRIVACY
3017 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3018 !(ifp->flags&IFA_F_TENTATIVE)) {
3019 if (age >= ifp->prefered_lft - regen_advance) {
3020 struct inet6_ifaddr *ifpub = ifp->ifpub;
3021 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3022 next = ifp->tstamp + ifp->prefered_lft * HZ;
3023 if (!ifp->regen_count && ifpub) {
3026 in6_ifa_hold(ifpub);
3027 spin_unlock(&ifp->lock);
3028 read_unlock(&addrconf_hash_lock);
3029 spin_lock(&ifpub->lock);
3030 ifpub->regen_count = 0;
3031 spin_unlock(&ifpub->lock);
3032 ipv6_create_tempaddr(ifpub, ifp);
3037 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3038 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3039 spin_unlock(&ifp->lock);
3042 /* ifp->prefered_lft <= ifp->valid_lft */
3043 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3044 next = ifp->tstamp + ifp->prefered_lft * HZ;
3045 spin_unlock(&ifp->lock);
3048 read_unlock(&addrconf_hash_lock);
3051 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
3052 add_timer(&addr_chk_timer);
3053 spin_unlock_bh(&addrconf_verify_lock);
3056 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3058 struct in6_addr *pfx = NULL;
3061 pfx = nla_data(addr);
3064 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3067 pfx = nla_data(local);
3073 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3074 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3075 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3076 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3080 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3082 struct net *net = sock_net(skb->sk);
3083 struct ifaddrmsg *ifm;
3084 struct nlattr *tb[IFA_MAX+1];
3085 struct in6_addr *pfx;
3088 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3092 ifm = nlmsg_data(nlh);
3093 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3097 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3100 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3101 u32 prefered_lft, u32 valid_lft)
3103 u32 flags = RTF_EXPIRES;
3105 if (!valid_lft || (prefered_lft > valid_lft))
3108 if (valid_lft == INFINITY_LIFE_TIME) {
3109 ifa_flags |= IFA_F_PERMANENT;
3111 } else if (valid_lft >= 0x7FFFFFFF/HZ)
3112 valid_lft = 0x7FFFFFFF/HZ;
3114 if (prefered_lft == 0)
3115 ifa_flags |= IFA_F_DEPRECATED;
3116 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
3117 (prefered_lft != INFINITY_LIFE_TIME))
3118 prefered_lft = 0x7FFFFFFF/HZ;
3120 spin_lock_bh(&ifp->lock);
3121 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3122 ifp->tstamp = jiffies;
3123 ifp->valid_lft = valid_lft;
3124 ifp->prefered_lft = prefered_lft;
3126 spin_unlock_bh(&ifp->lock);
3127 if (!(ifp->flags&IFA_F_TENTATIVE))
3128 ipv6_ifa_notify(0, ifp);
3130 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3131 jiffies_to_clock_t(valid_lft * HZ), flags);
3138 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3140 struct net *net = sock_net(skb->sk);
3141 struct ifaddrmsg *ifm;
3142 struct nlattr *tb[IFA_MAX+1];
3143 struct in6_addr *pfx;
3144 struct inet6_ifaddr *ifa;
3145 struct net_device *dev;
3146 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3150 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3154 ifm = nlmsg_data(nlh);
3155 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3159 if (tb[IFA_CACHEINFO]) {
3160 struct ifa_cacheinfo *ci;
3162 ci = nla_data(tb[IFA_CACHEINFO]);
3163 valid_lft = ci->ifa_valid;
3164 preferred_lft = ci->ifa_prefered;
3166 preferred_lft = INFINITY_LIFE_TIME;
3167 valid_lft = INFINITY_LIFE_TIME;
3170 dev = __dev_get_by_index(net, ifm->ifa_index);
3174 /* We ignore other flags so far. */
3175 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3177 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3180 * It would be best to check for !NLM_F_CREATE here but
3181 * userspace alreay relies on not having to provide this.
3183 return inet6_addr_add(net, ifm->ifa_index, pfx,
3184 ifm->ifa_prefixlen, ifa_flags,
3185 preferred_lft, valid_lft);
3188 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3189 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3192 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3199 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3200 u8 scope, int ifindex)
3202 struct ifaddrmsg *ifm;
3204 ifm = nlmsg_data(nlh);
3205 ifm->ifa_family = AF_INET6;
3206 ifm->ifa_prefixlen = prefixlen;
3207 ifm->ifa_flags = flags;
3208 ifm->ifa_scope = scope;
3209 ifm->ifa_index = ifindex;
3212 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3213 unsigned long tstamp, u32 preferred, u32 valid)
3215 struct ifa_cacheinfo ci;
3217 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3218 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3219 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3220 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3221 ci.ifa_prefered = preferred;
3222 ci.ifa_valid = valid;
3224 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3227 static inline int rt_scope(int ifa_scope)
3229 if (ifa_scope & IFA_HOST)
3230 return RT_SCOPE_HOST;
3231 else if (ifa_scope & IFA_LINK)
3232 return RT_SCOPE_LINK;
3233 else if (ifa_scope & IFA_SITE)
3234 return RT_SCOPE_SITE;
3236 return RT_SCOPE_UNIVERSE;
3239 static inline int inet6_ifaddr_msgsize(void)
3241 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3242 + nla_total_size(16) /* IFA_ADDRESS */
3243 + nla_total_size(sizeof(struct ifa_cacheinfo));
3246 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3247 u32 pid, u32 seq, int event, unsigned int flags)
3249 struct nlmsghdr *nlh;
3250 u32 preferred, valid;
3252 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3256 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3257 ifa->idev->dev->ifindex);
3259 if (!(ifa->flags&IFA_F_PERMANENT)) {
3260 preferred = ifa->prefered_lft;
3261 valid = ifa->valid_lft;
3262 if (preferred != INFINITY_LIFE_TIME) {
3263 long tval = (jiffies - ifa->tstamp)/HZ;
3265 if (valid != INFINITY_LIFE_TIME)
3269 preferred = INFINITY_LIFE_TIME;
3270 valid = INFINITY_LIFE_TIME;
3273 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3274 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3275 nlmsg_cancel(skb, nlh);
3279 return nlmsg_end(skb, nlh);
3282 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3283 u32 pid, u32 seq, int event, u16 flags)
3285 struct nlmsghdr *nlh;
3286 u8 scope = RT_SCOPE_UNIVERSE;
3287 int ifindex = ifmca->idev->dev->ifindex;
3289 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3290 scope = RT_SCOPE_SITE;
3292 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3296 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3297 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3298 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3299 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3300 nlmsg_cancel(skb, nlh);
3304 return nlmsg_end(skb, nlh);
3307 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3308 u32 pid, u32 seq, int event, unsigned int flags)
3310 struct nlmsghdr *nlh;
3311 u8 scope = RT_SCOPE_UNIVERSE;
3312 int ifindex = ifaca->aca_idev->dev->ifindex;
3314 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3315 scope = RT_SCOPE_SITE;
3317 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3321 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3322 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3323 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3324 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3325 nlmsg_cancel(skb, nlh);
3329 return nlmsg_end(skb, nlh);
3339 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3340 enum addr_type_t type)
3343 int s_idx, s_ip_idx;
3345 struct net_device *dev;
3346 struct inet6_dev *idev = NULL;
3347 struct inet6_ifaddr *ifa;
3348 struct ifmcaddr6 *ifmca;
3349 struct ifacaddr6 *ifaca;
3350 struct net *net = sock_net(skb->sk);
3352 s_idx = cb->args[0];
3353 s_ip_idx = ip_idx = cb->args[1];
3356 for_each_netdev(net, dev) {
3362 if ((idev = in6_dev_get(dev)) == NULL)
3364 read_lock_bh(&idev->lock);
3367 /* unicast address incl. temp addr */
3368 for (ifa = idev->addr_list; ifa;
3369 ifa = ifa->if_next, ip_idx++) {
3370 if (ip_idx < s_ip_idx)
3372 err = inet6_fill_ifaddr(skb, ifa,
3373 NETLINK_CB(cb->skb).pid,
3379 case MULTICAST_ADDR:
3380 /* multicast address */
3381 for (ifmca = idev->mc_list; ifmca;
3382 ifmca = ifmca->next, ip_idx++) {
3383 if (ip_idx < s_ip_idx)
3385 err = inet6_fill_ifmcaddr(skb, ifmca,
3386 NETLINK_CB(cb->skb).pid,
3393 /* anycast address */
3394 for (ifaca = idev->ac_list; ifaca;
3395 ifaca = ifaca->aca_next, ip_idx++) {
3396 if (ip_idx < s_ip_idx)
3398 err = inet6_fill_ifacaddr(skb, ifaca,
3399 NETLINK_CB(cb->skb).pid,
3408 read_unlock_bh(&idev->lock);
3417 cb->args[1] = ip_idx;
3421 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3423 enum addr_type_t type = UNICAST_ADDR;
3425 return inet6_dump_addr(skb, cb, type);
3428 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3430 enum addr_type_t type = MULTICAST_ADDR;
3432 return inet6_dump_addr(skb, cb, type);
3436 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3438 enum addr_type_t type = ANYCAST_ADDR;
3440 return inet6_dump_addr(skb, cb, type);
3443 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3446 struct net *net = sock_net(in_skb->sk);
3447 struct ifaddrmsg *ifm;
3448 struct nlattr *tb[IFA_MAX+1];
3449 struct in6_addr *addr = NULL;
3450 struct net_device *dev = NULL;
3451 struct inet6_ifaddr *ifa;
3452 struct sk_buff *skb;
3455 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3459 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3465 ifm = nlmsg_data(nlh);
3467 dev = __dev_get_by_index(net, ifm->ifa_index);
3469 if ((ifa = ipv6_get_ifaddr(net, addr, dev, 1)) == NULL) {
3470 err = -EADDRNOTAVAIL;
3474 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
3479 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3480 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3482 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3483 WARN_ON(err == -EMSGSIZE);
3487 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
3494 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3496 struct sk_buff *skb;
3497 struct net *net = dev_net(ifa->idev->dev);
3500 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3504 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3506 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3507 WARN_ON(err == -EMSGSIZE);
3511 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3514 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3517 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3518 __s32 *array, int bytes)
3520 BUG_ON(bytes < (DEVCONF_MAX * 4));
3522 memset(array, 0, bytes);
3523 array[DEVCONF_FORWARDING] = cnf->forwarding;
3524 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3525 array[DEVCONF_MTU6] = cnf->mtu6;
3526 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3527 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3528 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3529 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3530 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3531 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3532 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3533 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3534 #ifdef CONFIG_IPV6_PRIVACY
3535 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3536 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3537 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3538 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3539 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3541 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3542 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3543 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3544 #ifdef CONFIG_IPV6_ROUTER_PREF
3545 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3546 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3547 #ifdef CONFIG_IPV6_ROUTE_INFO
3548 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3551 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3552 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3553 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3554 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3558 static inline size_t inet6_if_nlmsg_size(void)
3560 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3561 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3562 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3563 + nla_total_size(4) /* IFLA_MTU */
3564 + nla_total_size(4) /* IFLA_LINK */
3565 + nla_total_size( /* IFLA_PROTINFO */
3566 nla_total_size(4) /* IFLA_INET6_FLAGS */
3567 + nla_total_size(sizeof(struct ifla_cacheinfo))
3568 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3569 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3570 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
3574 static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
3578 int pad = bytes - sizeof(u64) * items;
3581 /* Use put_unaligned() because stats may not be aligned for u64. */
3582 put_unaligned(items, &stats[0]);
3583 for (i = 1; i < items; i++)
3584 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3586 memset(&stats[items], 0, pad);
3589 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3593 case IFLA_INET6_STATS:
3594 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3596 case IFLA_INET6_ICMP6STATS:
3597 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3602 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3603 u32 pid, u32 seq, int event, unsigned int flags)
3605 struct net_device *dev = idev->dev;
3607 struct ifinfomsg *hdr;
3608 struct nlmsghdr *nlh;
3610 struct ifla_cacheinfo ci;
3612 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3616 hdr = nlmsg_data(nlh);
3617 hdr->ifi_family = AF_INET6;
3619 hdr->ifi_type = dev->type;
3620 hdr->ifi_index = dev->ifindex;
3621 hdr->ifi_flags = dev_get_flags(dev);
3622 hdr->ifi_change = 0;
3624 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3627 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3629 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3630 if (dev->ifindex != dev->iflink)
3631 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3633 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3634 if (protoinfo == NULL)
3635 goto nla_put_failure;
3637 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3639 ci.max_reasm_len = IPV6_MAXPLEN;
3640 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3641 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3642 ci.reachable_time = idev->nd_parms->reachable_time;
3643 ci.retrans_time = idev->nd_parms->retrans_time;
3644 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3646 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3648 goto nla_put_failure;
3649 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3651 /* XXX - MC not implemented */
3653 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3655 goto nla_put_failure;
3656 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3658 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3660 goto nla_put_failure;
3661 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3663 nla_nest_end(skb, protoinfo);
3664 return nlmsg_end(skb, nlh);
3667 nlmsg_cancel(skb, nlh);
3671 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3673 struct net *net = sock_net(skb->sk);
3675 int s_idx = cb->args[0];
3676 struct net_device *dev;
3677 struct inet6_dev *idev;
3679 read_lock(&dev_base_lock);
3681 for_each_netdev(net, dev) {
3684 if ((idev = in6_dev_get(dev)) == NULL)
3686 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3687 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3694 read_unlock(&dev_base_lock);
3700 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3702 struct sk_buff *skb;
3703 struct net *net = dev_net(idev->dev);
3706 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
3710 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
3712 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3713 WARN_ON(err == -EMSGSIZE);
3717 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3720 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3723 static inline size_t inet6_prefix_nlmsg_size(void)
3725 return NLMSG_ALIGN(sizeof(struct prefixmsg))
3726 + nla_total_size(sizeof(struct in6_addr))
3727 + nla_total_size(sizeof(struct prefix_cacheinfo));
3730 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3731 struct prefix_info *pinfo, u32 pid, u32 seq,
3732 int event, unsigned int flags)
3734 struct prefixmsg *pmsg;
3735 struct nlmsghdr *nlh;
3736 struct prefix_cacheinfo ci;
3738 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3742 pmsg = nlmsg_data(nlh);
3743 pmsg->prefix_family = AF_INET6;
3744 pmsg->prefix_pad1 = 0;
3745 pmsg->prefix_pad2 = 0;
3746 pmsg->prefix_ifindex = idev->dev->ifindex;
3747 pmsg->prefix_len = pinfo->prefix_len;
3748 pmsg->prefix_type = pinfo->type;
3749 pmsg->prefix_pad3 = 0;
3750 pmsg->prefix_flags = 0;
3752 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3753 if (pinfo->autoconf)
3754 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3756 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3758 ci.preferred_time = ntohl(pinfo->prefered);
3759 ci.valid_time = ntohl(pinfo->valid);
3760 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3762 return nlmsg_end(skb, nlh);
3765 nlmsg_cancel(skb, nlh);
3769 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3770 struct prefix_info *pinfo)
3772 struct sk_buff *skb;
3773 struct net *net = dev_net(idev->dev);
3776 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
3780 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
3782 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3783 WARN_ON(err == -EMSGSIZE);
3787 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3790 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
3793 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3795 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3800 * If the address was optimistic
3801 * we inserted the route at the start of
3802 * our DAD process, so we don't need
3805 if (!(ifp->rt->rt6i_node))
3806 ip6_ins_rt(ifp->rt);
3807 if (ifp->idev->cnf.forwarding)
3808 addrconf_join_anycast(ifp);
3811 if (ifp->idev->cnf.forwarding)
3812 addrconf_leave_anycast(ifp);
3813 addrconf_leave_solict(ifp->idev, &ifp->addr);
3814 dst_hold(&ifp->rt->u.dst);
3815 if (ip6_del_rt(ifp->rt))
3816 dst_free(&ifp->rt->u.dst);
3821 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3824 if (likely(ifp->idev->dead == 0))
3825 __ipv6_ifa_notify(event, ifp);
3826 rcu_read_unlock_bh();
3829 #ifdef CONFIG_SYSCTL
3832 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3833 void __user *buffer, size_t *lenp, loff_t *ppos)
3835 int *valp = ctl->data;
3839 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3842 addrconf_fixup_forwarding(ctl, valp, val);
3846 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3847 int __user *name, int nlen,
3848 void __user *oldval,
3849 size_t __user *oldlenp,
3850 void __user *newval, size_t newlen)
3852 int *valp = table->data;
3856 if (!newval || !newlen)
3858 if (newlen != sizeof(int))
3860 if (get_user(new, (int __user *)newval))
3864 if (oldval && oldlenp) {
3866 if (get_user(len, oldlenp))
3869 if (len > table->maxlen)
3870 len = table->maxlen;
3871 if (copy_to_user(oldval, valp, len))
3873 if (put_user(len, oldlenp))
3879 addrconf_fixup_forwarding(table, valp, val);
3883 static struct addrconf_sysctl_table
3885 struct ctl_table_header *sysctl_header;
3886 ctl_table addrconf_vars[__NET_IPV6_MAX];
3888 } addrconf_sysctl __read_mostly = {
3889 .sysctl_header = NULL,
3892 .ctl_name = NET_IPV6_FORWARDING,
3893 .procname = "forwarding",
3894 .data = &ipv6_devconf.forwarding,
3895 .maxlen = sizeof(int),
3897 .proc_handler = &addrconf_sysctl_forward,
3898 .strategy = &addrconf_sysctl_forward_strategy,
3901 .ctl_name = NET_IPV6_HOP_LIMIT,
3902 .procname = "hop_limit",
3903 .data = &ipv6_devconf.hop_limit,
3904 .maxlen = sizeof(int),
3906 .proc_handler = proc_dointvec,
3909 .ctl_name = NET_IPV6_MTU,
3911 .data = &ipv6_devconf.mtu6,
3912 .maxlen = sizeof(int),
3914 .proc_handler = &proc_dointvec,
3917 .ctl_name = NET_IPV6_ACCEPT_RA,
3918 .procname = "accept_ra",
3919 .data = &ipv6_devconf.accept_ra,
3920 .maxlen = sizeof(int),
3922 .proc_handler = &proc_dointvec,
3925 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS,
3926 .procname = "accept_redirects",
3927 .data = &ipv6_devconf.accept_redirects,
3928 .maxlen = sizeof(int),
3930 .proc_handler = &proc_dointvec,
3933 .ctl_name = NET_IPV6_AUTOCONF,
3934 .procname = "autoconf",
3935 .data = &ipv6_devconf.autoconf,
3936 .maxlen = sizeof(int),
3938 .proc_handler = &proc_dointvec,
3941 .ctl_name = NET_IPV6_DAD_TRANSMITS,
3942 .procname = "dad_transmits",
3943 .data = &ipv6_devconf.dad_transmits,
3944 .maxlen = sizeof(int),
3946 .proc_handler = &proc_dointvec,
3949 .ctl_name = NET_IPV6_RTR_SOLICITS,
3950 .procname = "router_solicitations",
3951 .data = &ipv6_devconf.rtr_solicits,
3952 .maxlen = sizeof(int),
3954 .proc_handler = &proc_dointvec,
3957 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL,
3958 .procname = "router_solicitation_interval",
3959 .data = &ipv6_devconf.rtr_solicit_interval,
3960 .maxlen = sizeof(int),
3962 .proc_handler = &proc_dointvec_jiffies,
3963 .strategy = &sysctl_jiffies,
3966 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY,
3967 .procname = "router_solicitation_delay",
3968 .data = &ipv6_devconf.rtr_solicit_delay,
3969 .maxlen = sizeof(int),
3971 .proc_handler = &proc_dointvec_jiffies,
3972 .strategy = &sysctl_jiffies,
3975 .ctl_name = NET_IPV6_FORCE_MLD_VERSION,
3976 .procname = "force_mld_version",
3977 .data = &ipv6_devconf.force_mld_version,
3978 .maxlen = sizeof(int),
3980 .proc_handler = &proc_dointvec,
3982 #ifdef CONFIG_IPV6_PRIVACY
3984 .ctl_name = NET_IPV6_USE_TEMPADDR,
3985 .procname = "use_tempaddr",
3986 .data = &ipv6_devconf.use_tempaddr,
3987 .maxlen = sizeof(int),
3989 .proc_handler = &proc_dointvec,
3992 .ctl_name = NET_IPV6_TEMP_VALID_LFT,
3993 .procname = "temp_valid_lft",
3994 .data = &ipv6_devconf.temp_valid_lft,
3995 .maxlen = sizeof(int),
3997 .proc_handler = &proc_dointvec,
4000 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT,
4001 .procname = "temp_prefered_lft",
4002 .data = &ipv6_devconf.temp_prefered_lft,
4003 .maxlen = sizeof(int),
4005 .proc_handler = &proc_dointvec,
4008 .ctl_name = NET_IPV6_REGEN_MAX_RETRY,
4009 .procname = "regen_max_retry",
4010 .data = &ipv6_devconf.regen_max_retry,
4011 .maxlen = sizeof(int),
4013 .proc_handler = &proc_dointvec,
4016 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR,
4017 .procname = "max_desync_factor",
4018 .data = &ipv6_devconf.max_desync_factor,
4019 .maxlen = sizeof(int),
4021 .proc_handler = &proc_dointvec,
4025 .ctl_name = NET_IPV6_MAX_ADDRESSES,
4026 .procname = "max_addresses",
4027 .data = &ipv6_devconf.max_addresses,
4028 .maxlen = sizeof(int),
4030 .proc_handler = &proc_dointvec,
4033 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR,
4034 .procname = "accept_ra_defrtr",
4035 .data = &ipv6_devconf.accept_ra_defrtr,
4036 .maxlen = sizeof(int),
4038 .proc_handler = &proc_dointvec,
4041 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO,
4042 .procname = "accept_ra_pinfo",
4043 .data = &ipv6_devconf.accept_ra_pinfo,
4044 .maxlen = sizeof(int),
4046 .proc_handler = &proc_dointvec,
4048 #ifdef CONFIG_IPV6_ROUTER_PREF
4050 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF,
4051 .procname = "accept_ra_rtr_pref",
4052 .data = &ipv6_devconf.accept_ra_rtr_pref,
4053 .maxlen = sizeof(int),
4055 .proc_handler = &proc_dointvec,
4058 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL,
4059 .procname = "router_probe_interval",
4060 .data = &ipv6_devconf.rtr_probe_interval,
4061 .maxlen = sizeof(int),
4063 .proc_handler = &proc_dointvec_jiffies,
4064 .strategy = &sysctl_jiffies,
4066 #ifdef CONFIG_IPV6_ROUTE_INFO
4068 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
4069 .procname = "accept_ra_rt_info_max_plen",
4070 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4071 .maxlen = sizeof(int),
4073 .proc_handler = &proc_dointvec,
4078 .ctl_name = NET_IPV6_PROXY_NDP,
4079 .procname = "proxy_ndp",
4080 .data = &ipv6_devconf.proxy_ndp,
4081 .maxlen = sizeof(int),
4083 .proc_handler = &proc_dointvec,
4086 .ctl_name = NET_IPV6_ACCEPT_SOURCE_ROUTE,
4087 .procname = "accept_source_route",
4088 .data = &ipv6_devconf.accept_source_route,
4089 .maxlen = sizeof(int),
4091 .proc_handler = &proc_dointvec,
4093 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4095 .ctl_name = CTL_UNNUMBERED,
4096 .procname = "optimistic_dad",
4097 .data = &ipv6_devconf.optimistic_dad,
4098 .maxlen = sizeof(int),
4100 .proc_handler = &proc_dointvec,
4105 .ctl_name = 0, /* sentinel */
4110 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4111 int ctl_name, struct inet6_dev *idev, struct ipv6_devconf *p)
4114 struct addrconf_sysctl_table *t;
4116 #define ADDRCONF_CTL_PATH_DEV 3
4118 struct ctl_path addrconf_ctl_path[] = {
4119 { .procname = "net", .ctl_name = CTL_NET, },
4120 { .procname = "ipv6", .ctl_name = NET_IPV6, },
4121 { .procname = "conf", .ctl_name = NET_IPV6_CONF, },
4122 { /* to be set */ },
4127 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4131 for (i=0; t->addrconf_vars[i].data; i++) {
4132 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
4133 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4134 t->addrconf_vars[i].extra2 = net;
4138 * Make a copy of dev_name, because '.procname' is regarded as const
4139 * by sysctl and we wouldn't want anyone to change it under our feet
4140 * (see SIOCSIFNAME).
4142 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4146 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4147 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].ctl_name = ctl_name;
4149 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4151 if (t->sysctl_header == NULL)
4165 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4167 struct addrconf_sysctl_table *t;
4169 if (p->sysctl == NULL)
4174 unregister_sysctl_table(t->sysctl_header);
4179 static void addrconf_sysctl_register(struct inet6_dev *idev)
4181 neigh_sysctl_register(idev->dev, idev->nd_parms, NET_IPV6,
4182 NET_IPV6_NEIGH, "ipv6",
4183 &ndisc_ifinfo_sysctl_change,
4185 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4186 idev->dev->ifindex, idev, &idev->cnf);
4189 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4191 __addrconf_sysctl_unregister(&idev->cnf);
4192 neigh_sysctl_unregister(idev->nd_parms);
4198 static int addrconf_init_net(struct net *net)
4201 struct ipv6_devconf *all, *dflt;
4204 all = &ipv6_devconf;
4205 dflt = &ipv6_devconf_dflt;
4207 if (net != &init_net) {
4208 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4212 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4214 goto err_alloc_dflt;
4217 net->ipv6.devconf_all = all;
4218 net->ipv6.devconf_dflt = dflt;
4220 #ifdef CONFIG_SYSCTL
4221 err = __addrconf_sysctl_register(net, "all", NET_PROTO_CONF_ALL,
4226 err = __addrconf_sysctl_register(net, "default", NET_PROTO_CONF_DEFAULT,
4233 #ifdef CONFIG_SYSCTL
4235 __addrconf_sysctl_unregister(all);
4245 static void addrconf_exit_net(struct net *net)
4247 #ifdef CONFIG_SYSCTL
4248 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4249 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4251 if (net != &init_net) {
4252 kfree(net->ipv6.devconf_dflt);
4253 kfree(net->ipv6.devconf_all);
4257 static struct pernet_operations addrconf_ops = {
4258 .init = addrconf_init_net,
4259 .exit = addrconf_exit_net,
4266 int register_inet6addr_notifier(struct notifier_block *nb)
4268 return atomic_notifier_chain_register(&inet6addr_chain, nb);
4271 EXPORT_SYMBOL(register_inet6addr_notifier);
4273 int unregister_inet6addr_notifier(struct notifier_block *nb)
4275 return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
4278 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4281 static int addrconf_net_init(struct net *net)
4286 static void addrconf_net_exit(struct net *net)
4288 struct net_device *dev;
4291 /* clean dev list */
4292 for_each_netdev(net, dev) {
4293 if (__in6_dev_get(dev) == NULL)
4295 addrconf_ifdown(dev, 1);
4297 addrconf_ifdown(net->loopback_dev, 2);
4301 static struct pernet_operations addrconf_net_ops = {
4302 .init = addrconf_net_init,
4303 .exit = addrconf_net_exit,
4307 * Init / cleanup code
4310 int __init addrconf_init(void)
4314 if ((err = ipv6_addr_label_init()) < 0) {
4315 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n",
4320 register_pernet_subsys(&addrconf_ops);
4322 /* The addrconf netdev notifier requires that loopback_dev
4323 * has it's ipv6 private information allocated and setup
4324 * before it can bring up and give link-local addresses
4325 * to other devices which are up.
4327 * Unfortunately, loopback_dev is not necessarily the first
4328 * entry in the global dev_base list of net devices. In fact,
4329 * it is likely to be the very last entry on that list.
4330 * So this causes the notifier registry below to try and
4331 * give link-local addresses to all devices besides loopback_dev
4332 * first, then loopback_dev, which cases all the non-loopback_dev
4333 * devices to fail to get a link-local address.
4335 * So, as a temporary fix, allocate the ipv6 structure for
4336 * loopback_dev first by hand.
4337 * Longer term, all of the dependencies ipv6 has upon the loopback
4338 * device and it being up should be removed.
4341 if (!ipv6_add_dev(init_net.loopback_dev))
4347 err = register_pernet_device(&addrconf_net_ops);
4351 register_netdevice_notifier(&ipv6_dev_notf);
4355 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4359 /* Only the first call to __rtnl_register can fail */
4360 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4361 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4362 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4363 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4364 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4366 ipv6_addr_label_rtnl_register();
4370 unregister_netdevice_notifier(&ipv6_dev_notf);
4372 unregister_pernet_subsys(&addrconf_ops);
4377 void addrconf_cleanup(void)
4379 struct inet6_ifaddr *ifa;
4382 unregister_netdevice_notifier(&ipv6_dev_notf);
4383 unregister_pernet_device(&addrconf_net_ops);
4385 unregister_pernet_subsys(&addrconf_ops);
4392 write_lock_bh(&addrconf_hash_lock);
4393 for (i=0; i < IN6_ADDR_HSIZE; i++) {
4394 for (ifa=inet6_addr_lst[i]; ifa; ) {
4395 struct inet6_ifaddr *bifa;
4398 ifa = ifa->lst_next;
4399 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4400 /* Do not free it; something is wrong.
4401 Now we can investigate it with debugger.
4405 write_unlock_bh(&addrconf_hash_lock);
4407 del_timer(&addr_chk_timer);
4410 unregister_pernet_subsys(&addrconf_net_ops);