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->nd_net->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 __FUNCTION__, 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 __FUNCTION__, 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();
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(&init_net, 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;
755 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
756 rt = rt6_lookup(&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)
880 struct ipv6_saddr_score {
888 #define IPV6_SADDR_SCORE_LOCAL 0x0001
889 #define IPV6_SADDR_SCORE_PREFERRED 0x0004
890 #define IPV6_SADDR_SCORE_HOA 0x0008
891 #define IPV6_SADDR_SCORE_OIF 0x0010
892 #define IPV6_SADDR_SCORE_LABEL 0x0020
893 #define IPV6_SADDR_SCORE_PRIVACY 0x0040
895 static inline int ipv6_saddr_preferred(int type)
897 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
898 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
903 int ipv6_dev_get_saddr(struct net_device *daddr_dev,
904 struct in6_addr *daddr, struct in6_addr *saddr)
906 struct ipv6_saddr_score hiscore;
907 struct inet6_ifaddr *ifa_result = NULL;
908 int daddr_type = __ipv6_addr_type(daddr);
909 int daddr_scope = __ipv6_addr_src_scope(daddr_type);
910 int daddr_ifindex = daddr_dev ? daddr_dev->ifindex : 0;
911 u32 daddr_label = ipv6_addr_label(daddr, daddr_type, daddr_ifindex);
912 struct net_device *dev;
914 memset(&hiscore, 0, sizeof(hiscore));
916 read_lock(&dev_base_lock);
919 for_each_netdev(&init_net, dev) {
920 struct inet6_dev *idev;
921 struct inet6_ifaddr *ifa;
923 /* Rule 0: Candidate Source Address (section 4)
924 * - multicast and link-local destination address,
925 * the set of candidate source address MUST only
926 * include addresses assigned to interfaces
927 * belonging to the same link as the outgoing
929 * (- For site-local destination addresses, the
930 * set of candidate source addresses MUST only
931 * include addresses assigned to interfaces
932 * belonging to the same site as the outgoing
935 if ((daddr_type & IPV6_ADDR_MULTICAST ||
936 daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
937 daddr_dev && dev != daddr_dev)
940 idev = __in6_dev_get(dev);
944 read_lock_bh(&idev->lock);
945 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
946 struct ipv6_saddr_score score;
948 score.addr_type = __ipv6_addr_type(&ifa->addr);
951 * - Tentative Address (RFC2462 section 5.4)
952 * - A tentative address is not considered
953 * "assigned to an interface" in the traditional
954 * sense, unless it is also flagged as optimistic.
955 * - Candidate Source Address (section 4)
956 * - In any case, anycast addresses, multicast
957 * addresses, and the unspecified address MUST
958 * NOT be included in a candidate set.
960 if ((ifa->flags & IFA_F_TENTATIVE) &&
961 (!(ifa->flags & IFA_F_OPTIMISTIC)))
963 if (unlikely(score.addr_type == IPV6_ADDR_ANY ||
964 score.addr_type & IPV6_ADDR_MULTICAST)) {
965 LIMIT_NETDEBUG(KERN_DEBUG
966 "ADDRCONF: unspecified / multicast address "
967 "assigned as unicast address on %s",
977 if (ifa_result == NULL) {
978 /* record it if the first available entry */
982 /* Rule 1: Prefer same address */
983 if (hiscore.rule < 1) {
984 if (ipv6_addr_equal(&ifa_result->addr, daddr))
985 hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL;
988 if (ipv6_addr_equal(&ifa->addr, daddr)) {
989 score.attrs |= IPV6_SADDR_SCORE_LOCAL;
990 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) {
995 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)
999 /* Rule 2: Prefer appropriate scope */
1000 if (hiscore.rule < 2) {
1001 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type);
1004 score.scope = __ipv6_addr_src_scope(score.addr_type);
1005 if (hiscore.scope < score.scope) {
1006 if (hiscore.scope < daddr_scope) {
1011 } else if (score.scope < hiscore.scope) {
1012 if (score.scope < daddr_scope)
1013 break; /* addresses sorted by scope */
1020 /* Rule 3: Avoid deprecated and optimistic addresses */
1021 if (hiscore.rule < 3) {
1022 if (ipv6_saddr_preferred(hiscore.addr_type) ||
1023 (((ifa_result->flags &
1024 (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0)))
1025 hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1028 if (ipv6_saddr_preferred(score.addr_type) ||
1030 (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0))) {
1031 score.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1032 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) {
1037 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)
1041 /* Rule 4: Prefer home address */
1042 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
1043 if (hiscore.rule < 4) {
1044 if (ifa_result->flags & IFA_F_HOMEADDRESS)
1045 hiscore.attrs |= IPV6_SADDR_SCORE_HOA;
1048 if (ifa->flags & IFA_F_HOMEADDRESS) {
1049 score.attrs |= IPV6_SADDR_SCORE_HOA;
1050 if (!(ifa_result->flags & IFA_F_HOMEADDRESS)) {
1055 if (hiscore.attrs & IPV6_SADDR_SCORE_HOA)
1059 if (hiscore.rule < 4)
1063 /* Rule 5: Prefer outgoing interface */
1064 if (hiscore.rule < 5) {
1065 if (daddr_dev == NULL ||
1066 daddr_dev == ifa_result->idev->dev)
1067 hiscore.attrs |= IPV6_SADDR_SCORE_OIF;
1070 if (daddr_dev == NULL ||
1071 daddr_dev == ifa->idev->dev) {
1072 score.attrs |= IPV6_SADDR_SCORE_OIF;
1073 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) {
1078 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF)
1082 /* Rule 6: Prefer matching label */
1083 if (hiscore.rule < 6) {
1084 if (ipv6_addr_label(&ifa_result->addr,
1086 ifa_result->idev->dev->ifindex) == daddr_label)
1087 hiscore.attrs |= IPV6_SADDR_SCORE_LABEL;
1090 if (ipv6_addr_label(&ifa->addr,
1092 ifa->idev->dev->ifindex) == daddr_label) {
1093 score.attrs |= IPV6_SADDR_SCORE_LABEL;
1094 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) {
1099 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL)
1103 #ifdef CONFIG_IPV6_PRIVACY
1104 /* Rule 7: Prefer public address
1105 * Note: prefer temprary address if use_tempaddr >= 2
1107 if (hiscore.rule < 7) {
1108 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^
1109 (ifa_result->idev->cnf.use_tempaddr >= 2))
1110 hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1113 if ((!(ifa->flags & IFA_F_TEMPORARY)) ^
1114 (ifa->idev->cnf.use_tempaddr >= 2)) {
1115 score.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1116 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) {
1121 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)
1125 if (hiscore.rule < 7)
1128 /* Rule 8: Use longest matching prefix */
1129 if (hiscore.rule < 8) {
1130 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
1133 score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
1134 if (score.matchlen > hiscore.matchlen) {
1139 else if (score.matchlen < hiscore.matchlen)
1143 /* Final Rule: choose first available one */
1147 in6_ifa_put(ifa_result);
1152 read_unlock_bh(&idev->lock);
1155 read_unlock(&dev_base_lock);
1158 return -EADDRNOTAVAIL;
1160 ipv6_addr_copy(saddr, &ifa_result->addr);
1161 in6_ifa_put(ifa_result);
1166 int ipv6_get_saddr(struct dst_entry *dst,
1167 struct in6_addr *daddr, struct in6_addr *saddr)
1169 return ipv6_dev_get_saddr(dst ? ip6_dst_idev(dst)->dev : NULL, daddr, saddr);
1172 EXPORT_SYMBOL(ipv6_get_saddr);
1174 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1175 unsigned char banned_flags)
1177 struct inet6_dev *idev;
1178 int err = -EADDRNOTAVAIL;
1181 if ((idev = __in6_dev_get(dev)) != NULL) {
1182 struct inet6_ifaddr *ifp;
1184 read_lock_bh(&idev->lock);
1185 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1186 if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1187 ipv6_addr_copy(addr, &ifp->addr);
1192 read_unlock_bh(&idev->lock);
1198 static int ipv6_count_addresses(struct inet6_dev *idev)
1201 struct inet6_ifaddr *ifp;
1203 read_lock_bh(&idev->lock);
1204 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1206 read_unlock_bh(&idev->lock);
1210 int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1211 struct net_device *dev, int strict)
1213 struct inet6_ifaddr * ifp;
1214 u8 hash = ipv6_addr_hash(addr);
1216 read_lock_bh(&addrconf_hash_lock);
1217 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1218 if (ifp->idev->dev->nd_net != net)
1220 if (ipv6_addr_equal(&ifp->addr, addr) &&
1221 !(ifp->flags&IFA_F_TENTATIVE)) {
1222 if (dev == NULL || ifp->idev->dev == dev ||
1223 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1227 read_unlock_bh(&addrconf_hash_lock);
1230 EXPORT_SYMBOL(ipv6_chk_addr);
1233 int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1234 struct net_device *dev)
1236 struct inet6_ifaddr * ifp;
1237 u8 hash = ipv6_addr_hash(addr);
1239 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1240 if (ifp->idev->dev->nd_net != net)
1242 if (ipv6_addr_equal(&ifp->addr, addr)) {
1243 if (dev == NULL || ifp->idev->dev == dev)
1250 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, struct in6_addr *addr,
1251 struct net_device *dev, int strict)
1253 struct inet6_ifaddr * ifp;
1254 u8 hash = ipv6_addr_hash(addr);
1256 read_lock_bh(&addrconf_hash_lock);
1257 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1258 if (ifp->idev->dev->nd_net != net)
1260 if (ipv6_addr_equal(&ifp->addr, addr)) {
1261 if (dev == NULL || ifp->idev->dev == dev ||
1262 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1268 read_unlock_bh(&addrconf_hash_lock);
1273 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1275 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1276 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
1277 __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1278 __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1279 int sk_ipv6only = ipv6_only_sock(sk);
1280 int sk2_ipv6only = inet_v6_ipv6only(sk2);
1281 int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1282 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1284 if (!sk2_rcv_saddr && !sk_ipv6only)
1287 if (addr_type2 == IPV6_ADDR_ANY &&
1288 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1291 if (addr_type == IPV6_ADDR_ANY &&
1292 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1295 if (sk2_rcv_saddr6 &&
1296 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1299 if (addr_type == IPV6_ADDR_MAPPED &&
1301 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1307 /* Gets referenced address, destroys ifaddr */
1309 static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1311 if (ifp->flags&IFA_F_PERMANENT) {
1312 spin_lock_bh(&ifp->lock);
1313 addrconf_del_timer(ifp);
1314 ifp->flags |= IFA_F_TENTATIVE;
1315 spin_unlock_bh(&ifp->lock);
1317 #ifdef CONFIG_IPV6_PRIVACY
1318 } else if (ifp->flags&IFA_F_TEMPORARY) {
1319 struct inet6_ifaddr *ifpub;
1320 spin_lock_bh(&ifp->lock);
1323 in6_ifa_hold(ifpub);
1324 spin_unlock_bh(&ifp->lock);
1325 ipv6_create_tempaddr(ifpub, ifp);
1328 spin_unlock_bh(&ifp->lock);
1336 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1338 if (net_ratelimit())
1339 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1340 addrconf_dad_stop(ifp);
1343 /* Join to solicited addr multicast group. */
1345 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1347 struct in6_addr maddr;
1349 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1352 addrconf_addr_solict_mult(addr, &maddr);
1353 ipv6_dev_mc_inc(dev, &maddr);
1356 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1358 struct in6_addr maddr;
1360 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1363 addrconf_addr_solict_mult(addr, &maddr);
1364 __ipv6_dev_mc_dec(idev, &maddr);
1367 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1369 struct in6_addr addr;
1370 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1371 if (ipv6_addr_any(&addr))
1373 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1376 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1378 struct in6_addr addr;
1379 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1380 if (ipv6_addr_any(&addr))
1382 __ipv6_dev_ac_dec(ifp->idev, &addr);
1385 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1387 if (dev->addr_len != ETH_ALEN)
1389 memcpy(eui, dev->dev_addr, 3);
1390 memcpy(eui + 5, dev->dev_addr + 3, 3);
1393 * The zSeries OSA network cards can be shared among various
1394 * OS instances, but the OSA cards have only one MAC address.
1395 * This leads to duplicate address conflicts in conjunction
1396 * with IPv6 if more than one instance uses the same card.
1398 * The driver for these cards can deliver a unique 16-bit
1399 * identifier for each instance sharing the same card. It is
1400 * placed instead of 0xFFFE in the interface identifier. The
1401 * "u" bit of the interface identifier is not inverted in this
1402 * case. Hence the resulting interface identifier has local
1403 * scope according to RFC2373.
1406 eui[3] = (dev->dev_id >> 8) & 0xFF;
1407 eui[4] = dev->dev_id & 0xFF;
1416 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1418 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1419 if (dev->addr_len != ARCNET_ALEN)
1422 eui[7] = *(u8*)dev->dev_addr;
1426 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1428 if (dev->addr_len != INFINIBAND_ALEN)
1430 memcpy(eui, dev->dev_addr + 12, 8);
1435 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1437 switch (dev->type) {
1440 case ARPHRD_IEEE802_TR:
1441 return addrconf_ifid_eui48(eui, dev);
1443 return addrconf_ifid_arcnet(eui, dev);
1444 case ARPHRD_INFINIBAND:
1445 return addrconf_ifid_infiniband(eui, dev);
1447 if (dev->priv_flags & IFF_ISATAP)
1448 return ipv6_isatap_eui64(eui, *(__be32 *)dev->dev_addr);
1453 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1456 struct inet6_ifaddr *ifp;
1458 read_lock_bh(&idev->lock);
1459 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1460 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1461 memcpy(eui, ifp->addr.s6_addr+8, 8);
1466 read_unlock_bh(&idev->lock);
1470 #ifdef CONFIG_IPV6_PRIVACY
1471 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1472 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1475 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1476 idev->rndid[0] &= ~0x02;
1479 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1480 * check if generated address is not inappropriate
1482 * - Reserved subnet anycast (RFC 2526)
1483 * 11111101 11....11 1xxxxxxx
1484 * - ISATAP (RFC4214) 6.1
1485 * 00-00-5E-FE-xx-xx-xx-xx
1487 * - XXX: already assigned to an address on the device
1489 if (idev->rndid[0] == 0xfd &&
1490 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1491 (idev->rndid[7]&0x80))
1493 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1494 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1496 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1503 static void ipv6_regen_rndid(unsigned long data)
1505 struct inet6_dev *idev = (struct inet6_dev *) data;
1506 unsigned long expires;
1509 write_lock_bh(&idev->lock);
1514 if (__ipv6_regen_rndid(idev) < 0)
1518 idev->cnf.temp_prefered_lft * HZ -
1519 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1520 if (time_before(expires, jiffies)) {
1522 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1527 if (!mod_timer(&idev->regen_timer, expires))
1531 write_unlock_bh(&idev->lock);
1532 rcu_read_unlock_bh();
1536 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1539 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1540 ret = __ipv6_regen_rndid(idev);
1550 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1551 unsigned long expires, u32 flags)
1553 struct fib6_config cfg = {
1554 .fc_table = RT6_TABLE_PREFIX,
1555 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1556 .fc_ifindex = dev->ifindex,
1557 .fc_expires = expires,
1559 .fc_flags = RTF_UP | flags,
1560 .fc_nlinfo.nl_net = &init_net,
1563 ipv6_addr_copy(&cfg.fc_dst, pfx);
1565 /* Prevent useless cloning on PtP SIT.
1566 This thing is done here expecting that the whole
1567 class of non-broadcast devices need not cloning.
1569 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1570 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1571 cfg.fc_flags |= RTF_NONEXTHOP;
1574 ip6_route_add(&cfg);
1577 /* Create "default" multicast route to the interface */
1579 static void addrconf_add_mroute(struct net_device *dev)
1581 struct fib6_config cfg = {
1582 .fc_table = RT6_TABLE_LOCAL,
1583 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1584 .fc_ifindex = dev->ifindex,
1587 .fc_nlinfo.nl_net = &init_net,
1590 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1592 ip6_route_add(&cfg);
1595 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1596 static void sit_route_add(struct net_device *dev)
1598 struct fib6_config cfg = {
1599 .fc_table = RT6_TABLE_MAIN,
1600 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1601 .fc_ifindex = dev->ifindex,
1603 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1604 .fc_nlinfo.nl_net = &init_net,
1607 /* prefix length - 96 bits "::d.d.d.d" */
1608 ip6_route_add(&cfg);
1612 static void addrconf_add_lroute(struct net_device *dev)
1614 struct in6_addr addr;
1616 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1617 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1620 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1622 struct inet6_dev *idev;
1626 if ((idev = ipv6_find_idev(dev)) == NULL)
1629 /* Add default multicast route */
1630 addrconf_add_mroute(dev);
1632 /* Add link local route */
1633 addrconf_add_lroute(dev);
1637 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1639 struct prefix_info *pinfo;
1643 unsigned long rt_expires;
1644 struct inet6_dev *in6_dev;
1646 pinfo = (struct prefix_info *) opt;
1648 if (len < sizeof(struct prefix_info)) {
1649 ADBG(("addrconf: prefix option too short\n"));
1654 * Validation checks ([ADDRCONF], page 19)
1657 addr_type = ipv6_addr_type(&pinfo->prefix);
1659 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1662 valid_lft = ntohl(pinfo->valid);
1663 prefered_lft = ntohl(pinfo->prefered);
1665 if (prefered_lft > valid_lft) {
1666 if (net_ratelimit())
1667 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1671 in6_dev = in6_dev_get(dev);
1673 if (in6_dev == NULL) {
1674 if (net_ratelimit())
1675 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1680 * Two things going on here:
1681 * 1) Add routes for on-link prefixes
1682 * 2) Configure prefixes with the auto flag set
1685 /* Avoid arithmetic overflow. Really, we could
1686 save rt_expires in seconds, likely valid_lft,
1687 but it would require division in fib gc, that it
1690 if (valid_lft >= 0x7FFFFFFF/HZ)
1691 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1693 rt_expires = valid_lft * HZ;
1696 * We convert this (in jiffies) to clock_t later.
1697 * Avoid arithmetic overflow there as well.
1698 * Overflow can happen only if HZ < USER_HZ.
1700 if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1701 rt_expires = 0x7FFFFFFF / USER_HZ;
1703 if (pinfo->onlink) {
1704 struct rt6_info *rt;
1705 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1707 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1708 if (rt->rt6i_flags&RTF_EXPIRES) {
1709 if (valid_lft == 0) {
1713 rt->rt6i_expires = jiffies + rt_expires;
1716 } else if (valid_lft) {
1717 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1718 dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1721 dst_release(&rt->u.dst);
1724 /* Try to figure out our local address for this prefix */
1726 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1727 struct inet6_ifaddr * ifp;
1728 struct in6_addr addr;
1729 int create = 0, update_lft = 0;
1731 if (pinfo->prefix_len == 64) {
1732 memcpy(&addr, &pinfo->prefix, 8);
1733 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1734 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1735 in6_dev_put(in6_dev);
1740 if (net_ratelimit())
1741 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1743 in6_dev_put(in6_dev);
1748 ifp = ipv6_get_ifaddr(&init_net, &addr, dev, 1);
1750 if (ifp == NULL && valid_lft) {
1751 int max_addresses = in6_dev->cnf.max_addresses;
1754 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1755 if (in6_dev->cnf.optimistic_dad &&
1756 !ipv6_devconf.forwarding)
1757 addr_flags = IFA_F_OPTIMISTIC;
1760 /* Do not allow to create too much of autoconfigured
1761 * addresses; this would be too easy way to crash kernel.
1763 if (!max_addresses ||
1764 ipv6_count_addresses(in6_dev) < max_addresses)
1765 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1766 addr_type&IPV6_ADDR_SCOPE_MASK,
1769 if (!ifp || IS_ERR(ifp)) {
1770 in6_dev_put(in6_dev);
1774 update_lft = create = 1;
1775 ifp->cstamp = jiffies;
1776 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1782 #ifdef CONFIG_IPV6_PRIVACY
1783 struct inet6_ifaddr *ift;
1787 /* update lifetime (RFC2462 5.5.3 e) */
1788 spin_lock(&ifp->lock);
1790 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1791 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1794 if (!update_lft && stored_lft) {
1795 if (valid_lft > MIN_VALID_LIFETIME ||
1796 valid_lft > stored_lft)
1798 else if (stored_lft <= MIN_VALID_LIFETIME) {
1799 /* valid_lft <= stored_lft is always true */
1803 valid_lft = MIN_VALID_LIFETIME;
1804 if (valid_lft < prefered_lft)
1805 prefered_lft = valid_lft;
1811 ifp->valid_lft = valid_lft;
1812 ifp->prefered_lft = prefered_lft;
1815 ifp->flags &= ~IFA_F_DEPRECATED;
1816 spin_unlock(&ifp->lock);
1818 if (!(flags&IFA_F_TENTATIVE))
1819 ipv6_ifa_notify(0, ifp);
1821 spin_unlock(&ifp->lock);
1823 #ifdef CONFIG_IPV6_PRIVACY
1824 read_lock_bh(&in6_dev->lock);
1825 /* update all temporary addresses in the list */
1826 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1828 * When adjusting the lifetimes of an existing
1829 * temporary address, only lower the lifetimes.
1830 * Implementations must not increase the
1831 * lifetimes of an existing temporary address
1832 * when processing a Prefix Information Option.
1834 if (ifp != ift->ifpub)
1837 spin_lock(&ift->lock);
1839 if (ift->valid_lft > valid_lft &&
1840 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1841 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1842 if (ift->prefered_lft > prefered_lft &&
1843 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1844 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1845 spin_unlock(&ift->lock);
1846 if (!(flags&IFA_F_TENTATIVE))
1847 ipv6_ifa_notify(0, ift);
1850 if (create && in6_dev->cnf.use_tempaddr > 0) {
1852 * When a new public address is created as described in [ADDRCONF],
1853 * also create a new temporary address.
1855 read_unlock_bh(&in6_dev->lock);
1856 ipv6_create_tempaddr(ifp, NULL);
1858 read_unlock_bh(&in6_dev->lock);
1865 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1866 in6_dev_put(in6_dev);
1870 * Set destination address.
1871 * Special case for SIT interfaces where we create a new "virtual"
1874 int addrconf_set_dstaddr(void __user *arg)
1876 struct in6_ifreq ireq;
1877 struct net_device *dev;
1883 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1886 dev = __dev_get_by_index(&init_net, ireq.ifr6_ifindex);
1892 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1893 if (dev->type == ARPHRD_SIT) {
1896 struct ip_tunnel_parm p;
1898 err = -EADDRNOTAVAIL;
1899 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1902 memset(&p, 0, sizeof(p));
1903 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1907 p.iph.protocol = IPPROTO_IPV6;
1909 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
1911 oldfs = get_fs(); set_fs(KERNEL_DS);
1912 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1917 if ((dev = __dev_get_by_name(&init_net, p.name)) == NULL)
1919 err = dev_open(dev);
1930 * Manual configuration of address on an interface
1932 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen,
1933 __u8 ifa_flags, __u32 prefered_lft, __u32 valid_lft)
1935 struct inet6_ifaddr *ifp;
1936 struct inet6_dev *idev;
1937 struct net_device *dev;
1939 u32 flags = RTF_EXPIRES;
1943 /* check the lifetime */
1944 if (!valid_lft || prefered_lft > valid_lft)
1947 if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL)
1950 if ((idev = addrconf_add_dev(dev)) == NULL)
1953 scope = ipv6_addr_scope(pfx);
1955 if (valid_lft == INFINITY_LIFE_TIME) {
1956 ifa_flags |= IFA_F_PERMANENT;
1958 } else if (valid_lft >= 0x7FFFFFFF/HZ)
1959 valid_lft = 0x7FFFFFFF/HZ;
1961 if (prefered_lft == 0)
1962 ifa_flags |= IFA_F_DEPRECATED;
1963 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
1964 (prefered_lft != INFINITY_LIFE_TIME))
1965 prefered_lft = 0x7FFFFFFF/HZ;
1967 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
1970 spin_lock_bh(&ifp->lock);
1971 ifp->valid_lft = valid_lft;
1972 ifp->prefered_lft = prefered_lft;
1973 ifp->tstamp = jiffies;
1974 spin_unlock_bh(&ifp->lock);
1976 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
1977 jiffies_to_clock_t(valid_lft * HZ), flags);
1979 * Note that section 3.1 of RFC 4429 indicates
1980 * that the Optimistic flag should not be set for
1981 * manually configured addresses
1983 addrconf_dad_start(ifp, 0);
1989 return PTR_ERR(ifp);
1992 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1994 struct inet6_ifaddr *ifp;
1995 struct inet6_dev *idev;
1996 struct net_device *dev;
1998 if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL)
2001 if ((idev = __in6_dev_get(dev)) == NULL)
2004 read_lock_bh(&idev->lock);
2005 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
2006 if (ifp->prefix_len == plen &&
2007 ipv6_addr_equal(pfx, &ifp->addr)) {
2009 read_unlock_bh(&idev->lock);
2013 /* If the last address is deleted administratively,
2014 disable IPv6 on this interface.
2016 if (idev->addr_list == NULL)
2017 addrconf_ifdown(idev->dev, 1);
2021 read_unlock_bh(&idev->lock);
2022 return -EADDRNOTAVAIL;
2026 int addrconf_add_ifaddr(void __user *arg)
2028 struct in6_ifreq ireq;
2031 if (!capable(CAP_NET_ADMIN))
2034 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2038 err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen,
2039 IFA_F_PERMANENT, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2044 int addrconf_del_ifaddr(void __user *arg)
2046 struct in6_ifreq ireq;
2049 if (!capable(CAP_NET_ADMIN))
2052 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2056 err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
2061 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2062 static void sit_add_v4_addrs(struct inet6_dev *idev)
2064 struct inet6_ifaddr * ifp;
2065 struct in6_addr addr;
2066 struct net_device *dev;
2071 memset(&addr, 0, sizeof(struct in6_addr));
2072 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2074 if (idev->dev->flags&IFF_POINTOPOINT) {
2075 addr.s6_addr32[0] = htonl(0xfe800000);
2078 scope = IPV6_ADDR_COMPATv4;
2081 if (addr.s6_addr32[3]) {
2082 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
2084 spin_lock_bh(&ifp->lock);
2085 ifp->flags &= ~IFA_F_TENTATIVE;
2086 spin_unlock_bh(&ifp->lock);
2087 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2093 for_each_netdev(&init_net, dev) {
2094 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2095 if (in_dev && (dev->flags & IFF_UP)) {
2096 struct in_ifaddr * ifa;
2100 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2103 addr.s6_addr32[3] = ifa->ifa_local;
2105 if (ifa->ifa_scope == RT_SCOPE_LINK)
2107 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2108 if (idev->dev->flags&IFF_POINTOPOINT)
2112 if (idev->dev->flags&IFF_POINTOPOINT)
2117 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2120 spin_lock_bh(&ifp->lock);
2121 ifp->flags &= ~IFA_F_TENTATIVE;
2122 spin_unlock_bh(&ifp->lock);
2123 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2132 static void init_loopback(struct net_device *dev)
2134 struct inet6_dev *idev;
2135 struct inet6_ifaddr * ifp;
2141 if ((idev = ipv6_find_idev(dev)) == NULL) {
2142 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2146 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2148 spin_lock_bh(&ifp->lock);
2149 ifp->flags &= ~IFA_F_TENTATIVE;
2150 spin_unlock_bh(&ifp->lock);
2151 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2156 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2158 struct inet6_ifaddr * ifp;
2159 u32 addr_flags = IFA_F_PERMANENT;
2161 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2162 if (idev->cnf.optimistic_dad &&
2163 !ipv6_devconf.forwarding)
2164 addr_flags |= IFA_F_OPTIMISTIC;
2168 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2170 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2171 addrconf_dad_start(ifp, 0);
2176 static void addrconf_dev_config(struct net_device *dev)
2178 struct in6_addr addr;
2179 struct inet6_dev * idev;
2183 if ((dev->type != ARPHRD_ETHER) &&
2184 (dev->type != ARPHRD_FDDI) &&
2185 (dev->type != ARPHRD_IEEE802_TR) &&
2186 (dev->type != ARPHRD_ARCNET) &&
2187 (dev->type != ARPHRD_INFINIBAND)) {
2188 /* Alas, we support only Ethernet autoconfiguration. */
2192 idev = addrconf_add_dev(dev);
2196 memset(&addr, 0, sizeof(struct in6_addr));
2197 addr.s6_addr32[0] = htonl(0xFE800000);
2199 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2200 addrconf_add_linklocal(idev, &addr);
2203 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2204 static void addrconf_sit_config(struct net_device *dev)
2206 struct inet6_dev *idev;
2211 * Configure the tunnel with one of our IPv4
2212 * addresses... we should configure all of
2213 * our v4 addrs in the tunnel
2216 if ((idev = ipv6_find_idev(dev)) == NULL) {
2217 printk(KERN_DEBUG "init sit: add_dev failed\n");
2221 if (dev->priv_flags & IFF_ISATAP) {
2222 struct in6_addr addr;
2224 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2225 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2226 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2227 addrconf_add_linklocal(idev, &addr);
2231 sit_add_v4_addrs(idev);
2233 if (dev->flags&IFF_POINTOPOINT) {
2234 addrconf_add_mroute(dev);
2235 addrconf_add_lroute(dev);
2242 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2244 struct in6_addr lladdr;
2246 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2247 addrconf_add_linklocal(idev, &lladdr);
2253 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2255 struct net_device *link_dev;
2257 /* first try to inherit the link-local address from the link device */
2258 if (idev->dev->iflink &&
2259 (link_dev = __dev_get_by_index(&init_net, idev->dev->iflink))) {
2260 if (!ipv6_inherit_linklocal(idev, link_dev))
2263 /* then try to inherit it from any device */
2264 for_each_netdev(&init_net, link_dev) {
2265 if (!ipv6_inherit_linklocal(idev, link_dev))
2268 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2272 * Autoconfigure tunnel with a link-local address so routing protocols,
2273 * DHCPv6, MLD etc. can be run over the virtual link
2276 static void addrconf_ip6_tnl_config(struct net_device *dev)
2278 struct inet6_dev *idev;
2282 if ((idev = addrconf_add_dev(dev)) == NULL) {
2283 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2286 ip6_tnl_add_linklocal(idev);
2289 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2292 struct net_device *dev = (struct net_device *) data;
2293 struct inet6_dev *idev = __in6_dev_get(dev);
2294 int run_pending = 0;
2297 if (dev->nd_net != &init_net)
2301 case NETDEV_REGISTER:
2302 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2303 idev = ipv6_add_dev(dev);
2305 return notifier_from_errno(-ENOMEM);
2310 if (dev->flags & IFF_SLAVE)
2313 if (event == NETDEV_UP) {
2314 if (!addrconf_qdisc_ok(dev)) {
2315 /* device is not ready yet. */
2317 "ADDRCONF(NETDEV_UP): %s: "
2318 "link is not ready\n",
2323 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2324 idev = ipv6_add_dev(dev);
2327 idev->if_flags |= IF_READY;
2329 if (!addrconf_qdisc_ok(dev)) {
2330 /* device is still not ready. */
2335 if (idev->if_flags & IF_READY) {
2336 /* device is already configured. */
2339 idev->if_flags |= IF_READY;
2343 "ADDRCONF(NETDEV_CHANGE): %s: "
2344 "link becomes ready\n",
2351 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2353 addrconf_sit_config(dev);
2356 case ARPHRD_TUNNEL6:
2357 addrconf_ip6_tnl_config(dev);
2359 case ARPHRD_LOOPBACK:
2364 addrconf_dev_config(dev);
2369 addrconf_dad_run(idev);
2371 /* If the MTU changed during the interface down, when the
2372 interface up, the changed MTU must be reflected in the
2373 idev as well as routers.
2375 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2376 rt6_mtu_change(dev, dev->mtu);
2377 idev->cnf.mtu6 = dev->mtu;
2379 idev->tstamp = jiffies;
2380 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2381 /* If the changed mtu during down is lower than IPV6_MIN_MTU
2382 stop IPv6 on this interface.
2384 if (dev->mtu < IPV6_MIN_MTU)
2385 addrconf_ifdown(dev, event != NETDEV_DOWN);
2389 case NETDEV_CHANGEMTU:
2390 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2391 rt6_mtu_change(dev, dev->mtu);
2392 idev->cnf.mtu6 = dev->mtu;
2396 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2397 idev = ipv6_add_dev(dev);
2402 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2405 case NETDEV_UNREGISTER:
2407 * Remove all addresses from this interface.
2409 addrconf_ifdown(dev, event != NETDEV_DOWN);
2412 case NETDEV_CHANGENAME:
2414 snmp6_unregister_dev(idev);
2415 addrconf_sysctl_unregister(idev);
2416 addrconf_sysctl_register(idev);
2417 err = snmp6_register_dev(idev);
2419 return notifier_from_errno(err);
2428 * addrconf module should be notified of a device going up
2430 static struct notifier_block ipv6_dev_notf = {
2431 .notifier_call = addrconf_notify,
2435 static int addrconf_ifdown(struct net_device *dev, int how)
2437 struct inet6_dev *idev;
2438 struct inet6_ifaddr *ifa, **bifa;
2443 if (dev == init_net.loopback_dev && how == 1)
2447 neigh_ifdown(&nd_tbl, dev);
2449 idev = __in6_dev_get(dev);
2453 /* Step 1: remove reference to ipv6 device from parent device.
2459 /* protected by rtnl_lock */
2460 rcu_assign_pointer(dev->ip6_ptr, NULL);
2462 /* Step 1.5: remove snmp6 entry */
2463 snmp6_unregister_dev(idev);
2467 /* Step 2: clear hash table */
2468 for (i=0; i<IN6_ADDR_HSIZE; i++) {
2469 bifa = &inet6_addr_lst[i];
2471 write_lock_bh(&addrconf_hash_lock);
2472 while ((ifa = *bifa) != NULL) {
2473 if (ifa->idev == idev) {
2474 *bifa = ifa->lst_next;
2475 ifa->lst_next = NULL;
2476 addrconf_del_timer(ifa);
2480 bifa = &ifa->lst_next;
2482 write_unlock_bh(&addrconf_hash_lock);
2485 write_lock_bh(&idev->lock);
2487 /* Step 3: clear flags for stateless addrconf */
2489 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2491 /* Step 4: clear address list */
2492 #ifdef CONFIG_IPV6_PRIVACY
2493 if (how == 1 && del_timer(&idev->regen_timer))
2496 /* clear tempaddr list */
2497 while ((ifa = idev->tempaddr_list) != NULL) {
2498 idev->tempaddr_list = ifa->tmp_next;
2499 ifa->tmp_next = NULL;
2501 write_unlock_bh(&idev->lock);
2502 spin_lock_bh(&ifa->lock);
2505 in6_ifa_put(ifa->ifpub);
2508 spin_unlock_bh(&ifa->lock);
2510 write_lock_bh(&idev->lock);
2513 while ((ifa = idev->addr_list) != NULL) {
2514 idev->addr_list = ifa->if_next;
2515 ifa->if_next = NULL;
2517 addrconf_del_timer(ifa);
2518 write_unlock_bh(&idev->lock);
2520 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2521 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2524 write_lock_bh(&idev->lock);
2526 write_unlock_bh(&idev->lock);
2528 /* Step 5: Discard multicast list */
2531 ipv6_mc_destroy_dev(idev);
2535 idev->tstamp = jiffies;
2537 /* Shot the device (if unregistered) */
2540 addrconf_sysctl_unregister(idev);
2541 neigh_parms_release(&nd_tbl, idev->nd_parms);
2542 neigh_ifdown(&nd_tbl, dev);
2548 static void addrconf_rs_timer(unsigned long data)
2550 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2552 if (ifp->idev->cnf.forwarding)
2555 if (ifp->idev->if_flags & IF_RA_RCVD) {
2557 * Announcement received after solicitation
2563 spin_lock(&ifp->lock);
2564 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2565 struct in6_addr all_routers;
2567 /* The wait after the last probe can be shorter */
2568 addrconf_mod_timer(ifp, AC_RS,
2569 (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2570 ifp->idev->cnf.rtr_solicit_delay :
2571 ifp->idev->cnf.rtr_solicit_interval);
2572 spin_unlock(&ifp->lock);
2574 ipv6_addr_all_routers(&all_routers);
2576 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2578 spin_unlock(&ifp->lock);
2580 * Note: we do not support deprecated "all on-link"
2581 * assumption any longer.
2583 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2584 ifp->idev->dev->name);
2592 * Duplicate Address Detection
2594 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2596 unsigned long rand_num;
2597 struct inet6_dev *idev = ifp->idev;
2599 if (ifp->flags & IFA_F_OPTIMISTIC)
2602 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2604 ifp->probes = idev->cnf.dad_transmits;
2605 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2608 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2610 struct inet6_dev *idev = ifp->idev;
2611 struct net_device *dev = idev->dev;
2613 addrconf_join_solict(dev, &ifp->addr);
2615 net_srandom(ifp->addr.s6_addr32[3]);
2617 read_lock_bh(&idev->lock);
2620 spin_lock_bh(&ifp->lock);
2622 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2623 !(ifp->flags&IFA_F_TENTATIVE) ||
2624 ifp->flags & IFA_F_NODAD) {
2625 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2626 spin_unlock_bh(&ifp->lock);
2627 read_unlock_bh(&idev->lock);
2629 addrconf_dad_completed(ifp);
2633 if (!(idev->if_flags & IF_READY)) {
2634 spin_unlock_bh(&ifp->lock);
2635 read_unlock_bh(&idev->lock);
2637 * If the defice is not ready:
2638 * - keep it tentative if it is a permanent address.
2639 * - otherwise, kill it.
2642 addrconf_dad_stop(ifp);
2647 * Optimistic nodes can start receiving
2650 if(ifp->flags & IFA_F_OPTIMISTIC)
2651 ip6_ins_rt(ifp->rt);
2653 addrconf_dad_kick(ifp);
2654 spin_unlock_bh(&ifp->lock);
2656 read_unlock_bh(&idev->lock);
2659 static void addrconf_dad_timer(unsigned long data)
2661 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2662 struct inet6_dev *idev = ifp->idev;
2663 struct in6_addr unspec;
2664 struct in6_addr mcaddr;
2666 read_lock_bh(&idev->lock);
2668 read_unlock_bh(&idev->lock);
2671 spin_lock_bh(&ifp->lock);
2672 if (ifp->probes == 0) {
2674 * DAD was successful
2677 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2678 spin_unlock_bh(&ifp->lock);
2679 read_unlock_bh(&idev->lock);
2681 addrconf_dad_completed(ifp);
2687 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2688 spin_unlock_bh(&ifp->lock);
2689 read_unlock_bh(&idev->lock);
2691 /* send a neighbour solicitation for our addr */
2692 memset(&unspec, 0, sizeof(unspec));
2693 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2694 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2699 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2701 struct net_device * dev = ifp->idev->dev;
2704 * Configure the address for reception. Now it is valid.
2707 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2709 /* If added prefix is link local and forwarding is off,
2710 start sending router solicitations.
2713 if (ifp->idev->cnf.forwarding == 0 &&
2714 ifp->idev->cnf.rtr_solicits > 0 &&
2715 (dev->flags&IFF_LOOPBACK) == 0 &&
2716 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2717 struct in6_addr all_routers;
2719 ipv6_addr_all_routers(&all_routers);
2722 * If a host as already performed a random delay
2723 * [...] as part of DAD [...] there is no need
2724 * to delay again before sending the first RS
2726 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2728 spin_lock_bh(&ifp->lock);
2730 ifp->idev->if_flags |= IF_RS_SENT;
2731 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2732 spin_unlock_bh(&ifp->lock);
2736 static void addrconf_dad_run(struct inet6_dev *idev) {
2737 struct inet6_ifaddr *ifp;
2739 read_lock_bh(&idev->lock);
2740 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2741 spin_lock_bh(&ifp->lock);
2742 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2743 spin_unlock_bh(&ifp->lock);
2746 spin_unlock_bh(&ifp->lock);
2747 addrconf_dad_kick(ifp);
2749 read_unlock_bh(&idev->lock);
2752 #ifdef CONFIG_PROC_FS
2753 struct if6_iter_state {
2754 struct seq_net_private p;
2758 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2760 struct inet6_ifaddr *ifa = NULL;
2761 struct if6_iter_state *state = seq->private;
2762 struct net *net = state->p.net;
2764 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2765 ifa = inet6_addr_lst[state->bucket];
2767 while (ifa && ifa->idev->dev->nd_net != net)
2768 ifa = ifa->lst_next;
2775 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2777 struct if6_iter_state *state = seq->private;
2778 struct net *net = state->p.net;
2780 ifa = ifa->lst_next;
2783 if (ifa->idev->dev->nd_net != net) {
2784 ifa = ifa->lst_next;
2789 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2790 ifa = inet6_addr_lst[state->bucket];
2797 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2799 struct inet6_ifaddr *ifa = if6_get_first(seq);
2802 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2804 return pos ? NULL : ifa;
2807 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2808 __acquires(addrconf_hash_lock)
2810 read_lock_bh(&addrconf_hash_lock);
2811 return if6_get_idx(seq, *pos);
2814 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2816 struct inet6_ifaddr *ifa;
2818 ifa = if6_get_next(seq, v);
2823 static void if6_seq_stop(struct seq_file *seq, void *v)
2824 __releases(addrconf_hash_lock)
2826 read_unlock_bh(&addrconf_hash_lock);
2829 static int if6_seq_show(struct seq_file *seq, void *v)
2831 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2833 NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
2835 ifp->idev->dev->ifindex,
2839 ifp->idev->dev->name);
2843 static const struct seq_operations if6_seq_ops = {
2844 .start = if6_seq_start,
2845 .next = if6_seq_next,
2846 .show = if6_seq_show,
2847 .stop = if6_seq_stop,
2850 static int if6_seq_open(struct inode *inode, struct file *file)
2852 return seq_open_net(inode, file, &if6_seq_ops,
2853 sizeof(struct if6_iter_state));
2856 static const struct file_operations if6_fops = {
2857 .owner = THIS_MODULE,
2858 .open = if6_seq_open,
2860 .llseek = seq_lseek,
2861 .release = seq_release_net,
2864 static int if6_proc_net_init(struct net *net)
2866 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
2871 static void if6_proc_net_exit(struct net *net)
2873 proc_net_remove(net, "if_inet6");
2876 static struct pernet_operations if6_proc_net_ops = {
2877 .init = if6_proc_net_init,
2878 .exit = if6_proc_net_exit,
2881 int __init if6_proc_init(void)
2883 return register_pernet_subsys(&if6_proc_net_ops);
2886 void if6_proc_exit(void)
2888 unregister_pernet_subsys(&if6_proc_net_ops);
2890 #endif /* CONFIG_PROC_FS */
2892 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
2893 /* Check if address is a home address configured on any interface. */
2894 int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
2897 struct inet6_ifaddr * ifp;
2898 u8 hash = ipv6_addr_hash(addr);
2899 read_lock_bh(&addrconf_hash_lock);
2900 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
2901 if (ifp->idev->dev->nd_net != net)
2903 if (ipv6_addr_cmp(&ifp->addr, addr) == 0 &&
2904 (ifp->flags & IFA_F_HOMEADDRESS)) {
2909 read_unlock_bh(&addrconf_hash_lock);
2915 * Periodic address status verification
2918 static void addrconf_verify(unsigned long foo)
2920 struct inet6_ifaddr *ifp;
2921 unsigned long now, next;
2924 spin_lock_bh(&addrconf_verify_lock);
2926 next = now + ADDR_CHECK_FREQUENCY;
2928 del_timer(&addr_chk_timer);
2930 for (i=0; i < IN6_ADDR_HSIZE; i++) {
2933 read_lock(&addrconf_hash_lock);
2934 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2936 #ifdef CONFIG_IPV6_PRIVACY
2937 unsigned long regen_advance;
2940 if (ifp->flags & IFA_F_PERMANENT)
2943 spin_lock(&ifp->lock);
2944 age = (now - ifp->tstamp) / HZ;
2946 #ifdef CONFIG_IPV6_PRIVACY
2947 regen_advance = ifp->idev->cnf.regen_max_retry *
2948 ifp->idev->cnf.dad_transmits *
2949 ifp->idev->nd_parms->retrans_time / HZ;
2952 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
2953 age >= ifp->valid_lft) {
2954 spin_unlock(&ifp->lock);
2956 read_unlock(&addrconf_hash_lock);
2959 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
2960 spin_unlock(&ifp->lock);
2962 } else if (age >= ifp->prefered_lft) {
2963 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2966 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2968 ifp->flags |= IFA_F_DEPRECATED;
2971 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2972 next = ifp->tstamp + ifp->valid_lft * HZ;
2974 spin_unlock(&ifp->lock);
2978 read_unlock(&addrconf_hash_lock);
2980 ipv6_ifa_notify(0, ifp);
2984 #ifdef CONFIG_IPV6_PRIVACY
2985 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2986 !(ifp->flags&IFA_F_TENTATIVE)) {
2987 if (age >= ifp->prefered_lft - regen_advance) {
2988 struct inet6_ifaddr *ifpub = ifp->ifpub;
2989 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2990 next = ifp->tstamp + ifp->prefered_lft * HZ;
2991 if (!ifp->regen_count && ifpub) {
2994 in6_ifa_hold(ifpub);
2995 spin_unlock(&ifp->lock);
2996 read_unlock(&addrconf_hash_lock);
2997 spin_lock(&ifpub->lock);
2998 ifpub->regen_count = 0;
2999 spin_unlock(&ifpub->lock);
3000 ipv6_create_tempaddr(ifpub, ifp);
3005 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3006 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3007 spin_unlock(&ifp->lock);
3010 /* ifp->prefered_lft <= ifp->valid_lft */
3011 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3012 next = ifp->tstamp + ifp->prefered_lft * HZ;
3013 spin_unlock(&ifp->lock);
3016 read_unlock(&addrconf_hash_lock);
3019 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
3020 add_timer(&addr_chk_timer);
3021 spin_unlock_bh(&addrconf_verify_lock);
3024 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3026 struct in6_addr *pfx = NULL;
3029 pfx = nla_data(addr);
3032 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3035 pfx = nla_data(local);
3041 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3042 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3043 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3044 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3048 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3050 struct net *net = skb->sk->sk_net;
3051 struct ifaddrmsg *ifm;
3052 struct nlattr *tb[IFA_MAX+1];
3053 struct in6_addr *pfx;
3056 if (net != &init_net)
3059 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3063 ifm = nlmsg_data(nlh);
3064 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3068 return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3071 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3072 u32 prefered_lft, u32 valid_lft)
3074 u32 flags = RTF_EXPIRES;
3076 if (!valid_lft || (prefered_lft > valid_lft))
3079 if (valid_lft == INFINITY_LIFE_TIME) {
3080 ifa_flags |= IFA_F_PERMANENT;
3082 } else if (valid_lft >= 0x7FFFFFFF/HZ)
3083 valid_lft = 0x7FFFFFFF/HZ;
3085 if (prefered_lft == 0)
3086 ifa_flags |= IFA_F_DEPRECATED;
3087 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
3088 (prefered_lft != INFINITY_LIFE_TIME))
3089 prefered_lft = 0x7FFFFFFF/HZ;
3091 spin_lock_bh(&ifp->lock);
3092 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3093 ifp->tstamp = jiffies;
3094 ifp->valid_lft = valid_lft;
3095 ifp->prefered_lft = prefered_lft;
3097 spin_unlock_bh(&ifp->lock);
3098 if (!(ifp->flags&IFA_F_TENTATIVE))
3099 ipv6_ifa_notify(0, ifp);
3101 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3102 jiffies_to_clock_t(valid_lft * HZ), flags);
3109 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3111 struct net *net = skb->sk->sk_net;
3112 struct ifaddrmsg *ifm;
3113 struct nlattr *tb[IFA_MAX+1];
3114 struct in6_addr *pfx;
3115 struct inet6_ifaddr *ifa;
3116 struct net_device *dev;
3117 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3121 if (net != &init_net)
3124 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3128 ifm = nlmsg_data(nlh);
3129 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3133 if (tb[IFA_CACHEINFO]) {
3134 struct ifa_cacheinfo *ci;
3136 ci = nla_data(tb[IFA_CACHEINFO]);
3137 valid_lft = ci->ifa_valid;
3138 preferred_lft = ci->ifa_prefered;
3140 preferred_lft = INFINITY_LIFE_TIME;
3141 valid_lft = INFINITY_LIFE_TIME;
3144 dev = __dev_get_by_index(&init_net, ifm->ifa_index);
3148 /* We ignore other flags so far. */
3149 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3151 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3154 * It would be best to check for !NLM_F_CREATE here but
3155 * userspace alreay relies on not having to provide this.
3157 return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen,
3158 ifa_flags, preferred_lft, valid_lft);
3161 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3162 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3165 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3172 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3173 u8 scope, int ifindex)
3175 struct ifaddrmsg *ifm;
3177 ifm = nlmsg_data(nlh);
3178 ifm->ifa_family = AF_INET6;
3179 ifm->ifa_prefixlen = prefixlen;
3180 ifm->ifa_flags = flags;
3181 ifm->ifa_scope = scope;
3182 ifm->ifa_index = ifindex;
3185 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3186 unsigned long tstamp, u32 preferred, u32 valid)
3188 struct ifa_cacheinfo ci;
3190 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3191 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3192 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3193 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3194 ci.ifa_prefered = preferred;
3195 ci.ifa_valid = valid;
3197 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3200 static inline int rt_scope(int ifa_scope)
3202 if (ifa_scope & IFA_HOST)
3203 return RT_SCOPE_HOST;
3204 else if (ifa_scope & IFA_LINK)
3205 return RT_SCOPE_LINK;
3206 else if (ifa_scope & IFA_SITE)
3207 return RT_SCOPE_SITE;
3209 return RT_SCOPE_UNIVERSE;
3212 static inline int inet6_ifaddr_msgsize(void)
3214 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3215 + nla_total_size(16) /* IFA_ADDRESS */
3216 + nla_total_size(sizeof(struct ifa_cacheinfo));
3219 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3220 u32 pid, u32 seq, int event, unsigned int flags)
3222 struct nlmsghdr *nlh;
3223 u32 preferred, valid;
3225 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3229 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3230 ifa->idev->dev->ifindex);
3232 if (!(ifa->flags&IFA_F_PERMANENT)) {
3233 preferred = ifa->prefered_lft;
3234 valid = ifa->valid_lft;
3235 if (preferred != INFINITY_LIFE_TIME) {
3236 long tval = (jiffies - ifa->tstamp)/HZ;
3238 if (valid != INFINITY_LIFE_TIME)
3242 preferred = INFINITY_LIFE_TIME;
3243 valid = INFINITY_LIFE_TIME;
3246 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3247 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3248 nlmsg_cancel(skb, nlh);
3252 return nlmsg_end(skb, nlh);
3255 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3256 u32 pid, u32 seq, int event, u16 flags)
3258 struct nlmsghdr *nlh;
3259 u8 scope = RT_SCOPE_UNIVERSE;
3260 int ifindex = ifmca->idev->dev->ifindex;
3262 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3263 scope = RT_SCOPE_SITE;
3265 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3269 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3270 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3271 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3272 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3273 nlmsg_cancel(skb, nlh);
3277 return nlmsg_end(skb, nlh);
3280 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3281 u32 pid, u32 seq, int event, unsigned int flags)
3283 struct nlmsghdr *nlh;
3284 u8 scope = RT_SCOPE_UNIVERSE;
3285 int ifindex = ifaca->aca_idev->dev->ifindex;
3287 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3288 scope = RT_SCOPE_SITE;
3290 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3294 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3295 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3296 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3297 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3298 nlmsg_cancel(skb, nlh);
3302 return nlmsg_end(skb, nlh);
3312 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3313 enum addr_type_t type)
3316 int s_idx, s_ip_idx;
3318 struct net_device *dev;
3319 struct inet6_dev *idev = NULL;
3320 struct inet6_ifaddr *ifa;
3321 struct ifmcaddr6 *ifmca;
3322 struct ifacaddr6 *ifaca;
3324 s_idx = cb->args[0];
3325 s_ip_idx = ip_idx = cb->args[1];
3328 for_each_netdev(&init_net, dev) {
3334 if ((idev = in6_dev_get(dev)) == NULL)
3336 read_lock_bh(&idev->lock);
3339 /* unicast address incl. temp addr */
3340 for (ifa = idev->addr_list; ifa;
3341 ifa = ifa->if_next, ip_idx++) {
3342 if (ip_idx < s_ip_idx)
3344 err = inet6_fill_ifaddr(skb, ifa,
3345 NETLINK_CB(cb->skb).pid,
3351 case MULTICAST_ADDR:
3352 /* multicast address */
3353 for (ifmca = idev->mc_list; ifmca;
3354 ifmca = ifmca->next, ip_idx++) {
3355 if (ip_idx < s_ip_idx)
3357 err = inet6_fill_ifmcaddr(skb, ifmca,
3358 NETLINK_CB(cb->skb).pid,
3365 /* anycast address */
3366 for (ifaca = idev->ac_list; ifaca;
3367 ifaca = ifaca->aca_next, ip_idx++) {
3368 if (ip_idx < s_ip_idx)
3370 err = inet6_fill_ifacaddr(skb, ifaca,
3371 NETLINK_CB(cb->skb).pid,
3380 read_unlock_bh(&idev->lock);
3389 cb->args[1] = ip_idx;
3393 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3395 struct net *net = skb->sk->sk_net;
3396 enum addr_type_t type = UNICAST_ADDR;
3398 if (net != &init_net)
3401 return inet6_dump_addr(skb, cb, type);
3404 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3406 struct net *net = skb->sk->sk_net;
3407 enum addr_type_t type = MULTICAST_ADDR;
3409 if (net != &init_net)
3412 return inet6_dump_addr(skb, cb, type);
3416 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3418 struct net *net = skb->sk->sk_net;
3419 enum addr_type_t type = ANYCAST_ADDR;
3421 if (net != &init_net)
3424 return inet6_dump_addr(skb, cb, type);
3427 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3430 struct net *net = in_skb->sk->sk_net;
3431 struct ifaddrmsg *ifm;
3432 struct nlattr *tb[IFA_MAX+1];
3433 struct in6_addr *addr = NULL;
3434 struct net_device *dev = NULL;
3435 struct inet6_ifaddr *ifa;
3436 struct sk_buff *skb;
3439 if (net != &init_net)
3442 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3446 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3452 ifm = nlmsg_data(nlh);
3454 dev = __dev_get_by_index(&init_net, ifm->ifa_index);
3456 if ((ifa = ipv6_get_ifaddr(net, addr, dev, 1)) == NULL) {
3457 err = -EADDRNOTAVAIL;
3461 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
3466 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3467 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3469 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3470 WARN_ON(err == -EMSGSIZE);
3474 err = rtnl_unicast(skb, &init_net, NETLINK_CB(in_skb).pid);
3481 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3483 struct sk_buff *skb;
3486 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3490 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3492 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3493 WARN_ON(err == -EMSGSIZE);
3497 err = rtnl_notify(skb, &init_net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3500 rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_IFADDR, err);
3503 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3504 __s32 *array, int bytes)
3506 BUG_ON(bytes < (DEVCONF_MAX * 4));
3508 memset(array, 0, bytes);
3509 array[DEVCONF_FORWARDING] = cnf->forwarding;
3510 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3511 array[DEVCONF_MTU6] = cnf->mtu6;
3512 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3513 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3514 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3515 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3516 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3517 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3518 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3519 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3520 #ifdef CONFIG_IPV6_PRIVACY
3521 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3522 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3523 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3524 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3525 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3527 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3528 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3529 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3530 #ifdef CONFIG_IPV6_ROUTER_PREF
3531 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3532 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3533 #ifdef CONFIG_IPV6_ROUTE_INFO
3534 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3537 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3538 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3539 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3540 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3544 static inline size_t inet6_if_nlmsg_size(void)
3546 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3547 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3548 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3549 + nla_total_size(4) /* IFLA_MTU */
3550 + nla_total_size(4) /* IFLA_LINK */
3551 + nla_total_size( /* IFLA_PROTINFO */
3552 nla_total_size(4) /* IFLA_INET6_FLAGS */
3553 + nla_total_size(sizeof(struct ifla_cacheinfo))
3554 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3555 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3556 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
3560 static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
3564 int pad = bytes - sizeof(u64) * items;
3567 /* Use put_unaligned() because stats may not be aligned for u64. */
3568 put_unaligned(items, &stats[0]);
3569 for (i = 1; i < items; i++)
3570 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3572 memset(&stats[items], 0, pad);
3575 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3579 case IFLA_INET6_STATS:
3580 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3582 case IFLA_INET6_ICMP6STATS:
3583 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3588 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3589 u32 pid, u32 seq, int event, unsigned int flags)
3591 struct net_device *dev = idev->dev;
3593 struct ifinfomsg *hdr;
3594 struct nlmsghdr *nlh;
3596 struct ifla_cacheinfo ci;
3598 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3602 hdr = nlmsg_data(nlh);
3603 hdr->ifi_family = AF_INET6;
3605 hdr->ifi_type = dev->type;
3606 hdr->ifi_index = dev->ifindex;
3607 hdr->ifi_flags = dev_get_flags(dev);
3608 hdr->ifi_change = 0;
3610 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3613 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3615 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3616 if (dev->ifindex != dev->iflink)
3617 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3619 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3620 if (protoinfo == NULL)
3621 goto nla_put_failure;
3623 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3625 ci.max_reasm_len = IPV6_MAXPLEN;
3626 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3627 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3628 ci.reachable_time = idev->nd_parms->reachable_time;
3629 ci.retrans_time = idev->nd_parms->retrans_time;
3630 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3632 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3634 goto nla_put_failure;
3635 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3637 /* XXX - MC not implemented */
3639 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3641 goto nla_put_failure;
3642 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3644 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3646 goto nla_put_failure;
3647 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3649 nla_nest_end(skb, protoinfo);
3650 return nlmsg_end(skb, nlh);
3653 nlmsg_cancel(skb, nlh);
3657 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3659 struct net *net = skb->sk->sk_net;
3661 int s_idx = cb->args[0];
3662 struct net_device *dev;
3663 struct inet6_dev *idev;
3665 if (net != &init_net)
3668 read_lock(&dev_base_lock);
3670 for_each_netdev(&init_net, dev) {
3673 if ((idev = in6_dev_get(dev)) == NULL)
3675 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3676 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3683 read_unlock(&dev_base_lock);
3689 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3691 struct sk_buff *skb;
3694 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
3698 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
3700 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3701 WARN_ON(err == -EMSGSIZE);
3705 err = rtnl_notify(skb, &init_net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3708 rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_IFADDR, err);
3711 static inline size_t inet6_prefix_nlmsg_size(void)
3713 return NLMSG_ALIGN(sizeof(struct prefixmsg))
3714 + nla_total_size(sizeof(struct in6_addr))
3715 + nla_total_size(sizeof(struct prefix_cacheinfo));
3718 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3719 struct prefix_info *pinfo, u32 pid, u32 seq,
3720 int event, unsigned int flags)
3722 struct prefixmsg *pmsg;
3723 struct nlmsghdr *nlh;
3724 struct prefix_cacheinfo ci;
3726 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3730 pmsg = nlmsg_data(nlh);
3731 pmsg->prefix_family = AF_INET6;
3732 pmsg->prefix_pad1 = 0;
3733 pmsg->prefix_pad2 = 0;
3734 pmsg->prefix_ifindex = idev->dev->ifindex;
3735 pmsg->prefix_len = pinfo->prefix_len;
3736 pmsg->prefix_type = pinfo->type;
3737 pmsg->prefix_pad3 = 0;
3738 pmsg->prefix_flags = 0;
3740 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3741 if (pinfo->autoconf)
3742 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3744 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3746 ci.preferred_time = ntohl(pinfo->prefered);
3747 ci.valid_time = ntohl(pinfo->valid);
3748 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3750 return nlmsg_end(skb, nlh);
3753 nlmsg_cancel(skb, nlh);
3757 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3758 struct prefix_info *pinfo)
3760 struct sk_buff *skb;
3763 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
3767 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
3769 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3770 WARN_ON(err == -EMSGSIZE);
3774 err = rtnl_notify(skb, &init_net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3777 rtnl_set_sk_err(&init_net, RTNLGRP_IPV6_PREFIX, err);
3780 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3782 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3787 * If the address was optimistic
3788 * we inserted the route at the start of
3789 * our DAD process, so we don't need
3792 if (!(ifp->rt->rt6i_node))
3793 ip6_ins_rt(ifp->rt);
3794 if (ifp->idev->cnf.forwarding)
3795 addrconf_join_anycast(ifp);
3798 if (ifp->idev->cnf.forwarding)
3799 addrconf_leave_anycast(ifp);
3800 addrconf_leave_solict(ifp->idev, &ifp->addr);
3801 dst_hold(&ifp->rt->u.dst);
3802 if (ip6_del_rt(ifp->rt))
3803 dst_free(&ifp->rt->u.dst);
3808 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3811 if (likely(ifp->idev->dead == 0))
3812 __ipv6_ifa_notify(event, ifp);
3813 rcu_read_unlock_bh();
3816 #ifdef CONFIG_SYSCTL
3819 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3820 void __user *buffer, size_t *lenp, loff_t *ppos)
3822 int *valp = ctl->data;
3826 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3829 addrconf_fixup_forwarding(ctl, valp, val);
3833 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3834 int __user *name, int nlen,
3835 void __user *oldval,
3836 size_t __user *oldlenp,
3837 void __user *newval, size_t newlen)
3839 int *valp = table->data;
3843 if (!newval || !newlen)
3845 if (newlen != sizeof(int))
3847 if (get_user(new, (int __user *)newval))
3851 if (oldval && oldlenp) {
3853 if (get_user(len, oldlenp))
3856 if (len > table->maxlen)
3857 len = table->maxlen;
3858 if (copy_to_user(oldval, valp, len))
3860 if (put_user(len, oldlenp))
3866 addrconf_fixup_forwarding(table, valp, val);
3870 static struct addrconf_sysctl_table
3872 struct ctl_table_header *sysctl_header;
3873 ctl_table addrconf_vars[__NET_IPV6_MAX];
3875 } addrconf_sysctl __read_mostly = {
3876 .sysctl_header = NULL,
3879 .ctl_name = NET_IPV6_FORWARDING,
3880 .procname = "forwarding",
3881 .data = &ipv6_devconf.forwarding,
3882 .maxlen = sizeof(int),
3884 .proc_handler = &addrconf_sysctl_forward,
3885 .strategy = &addrconf_sysctl_forward_strategy,
3888 .ctl_name = NET_IPV6_HOP_LIMIT,
3889 .procname = "hop_limit",
3890 .data = &ipv6_devconf.hop_limit,
3891 .maxlen = sizeof(int),
3893 .proc_handler = proc_dointvec,
3896 .ctl_name = NET_IPV6_MTU,
3898 .data = &ipv6_devconf.mtu6,
3899 .maxlen = sizeof(int),
3901 .proc_handler = &proc_dointvec,
3904 .ctl_name = NET_IPV6_ACCEPT_RA,
3905 .procname = "accept_ra",
3906 .data = &ipv6_devconf.accept_ra,
3907 .maxlen = sizeof(int),
3909 .proc_handler = &proc_dointvec,
3912 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS,
3913 .procname = "accept_redirects",
3914 .data = &ipv6_devconf.accept_redirects,
3915 .maxlen = sizeof(int),
3917 .proc_handler = &proc_dointvec,
3920 .ctl_name = NET_IPV6_AUTOCONF,
3921 .procname = "autoconf",
3922 .data = &ipv6_devconf.autoconf,
3923 .maxlen = sizeof(int),
3925 .proc_handler = &proc_dointvec,
3928 .ctl_name = NET_IPV6_DAD_TRANSMITS,
3929 .procname = "dad_transmits",
3930 .data = &ipv6_devconf.dad_transmits,
3931 .maxlen = sizeof(int),
3933 .proc_handler = &proc_dointvec,
3936 .ctl_name = NET_IPV6_RTR_SOLICITS,
3937 .procname = "router_solicitations",
3938 .data = &ipv6_devconf.rtr_solicits,
3939 .maxlen = sizeof(int),
3941 .proc_handler = &proc_dointvec,
3944 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL,
3945 .procname = "router_solicitation_interval",
3946 .data = &ipv6_devconf.rtr_solicit_interval,
3947 .maxlen = sizeof(int),
3949 .proc_handler = &proc_dointvec_jiffies,
3950 .strategy = &sysctl_jiffies,
3953 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY,
3954 .procname = "router_solicitation_delay",
3955 .data = &ipv6_devconf.rtr_solicit_delay,
3956 .maxlen = sizeof(int),
3958 .proc_handler = &proc_dointvec_jiffies,
3959 .strategy = &sysctl_jiffies,
3962 .ctl_name = NET_IPV6_FORCE_MLD_VERSION,
3963 .procname = "force_mld_version",
3964 .data = &ipv6_devconf.force_mld_version,
3965 .maxlen = sizeof(int),
3967 .proc_handler = &proc_dointvec,
3969 #ifdef CONFIG_IPV6_PRIVACY
3971 .ctl_name = NET_IPV6_USE_TEMPADDR,
3972 .procname = "use_tempaddr",
3973 .data = &ipv6_devconf.use_tempaddr,
3974 .maxlen = sizeof(int),
3976 .proc_handler = &proc_dointvec,
3979 .ctl_name = NET_IPV6_TEMP_VALID_LFT,
3980 .procname = "temp_valid_lft",
3981 .data = &ipv6_devconf.temp_valid_lft,
3982 .maxlen = sizeof(int),
3984 .proc_handler = &proc_dointvec,
3987 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT,
3988 .procname = "temp_prefered_lft",
3989 .data = &ipv6_devconf.temp_prefered_lft,
3990 .maxlen = sizeof(int),
3992 .proc_handler = &proc_dointvec,
3995 .ctl_name = NET_IPV6_REGEN_MAX_RETRY,
3996 .procname = "regen_max_retry",
3997 .data = &ipv6_devconf.regen_max_retry,
3998 .maxlen = sizeof(int),
4000 .proc_handler = &proc_dointvec,
4003 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR,
4004 .procname = "max_desync_factor",
4005 .data = &ipv6_devconf.max_desync_factor,
4006 .maxlen = sizeof(int),
4008 .proc_handler = &proc_dointvec,
4012 .ctl_name = NET_IPV6_MAX_ADDRESSES,
4013 .procname = "max_addresses",
4014 .data = &ipv6_devconf.max_addresses,
4015 .maxlen = sizeof(int),
4017 .proc_handler = &proc_dointvec,
4020 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR,
4021 .procname = "accept_ra_defrtr",
4022 .data = &ipv6_devconf.accept_ra_defrtr,
4023 .maxlen = sizeof(int),
4025 .proc_handler = &proc_dointvec,
4028 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO,
4029 .procname = "accept_ra_pinfo",
4030 .data = &ipv6_devconf.accept_ra_pinfo,
4031 .maxlen = sizeof(int),
4033 .proc_handler = &proc_dointvec,
4035 #ifdef CONFIG_IPV6_ROUTER_PREF
4037 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF,
4038 .procname = "accept_ra_rtr_pref",
4039 .data = &ipv6_devconf.accept_ra_rtr_pref,
4040 .maxlen = sizeof(int),
4042 .proc_handler = &proc_dointvec,
4045 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL,
4046 .procname = "router_probe_interval",
4047 .data = &ipv6_devconf.rtr_probe_interval,
4048 .maxlen = sizeof(int),
4050 .proc_handler = &proc_dointvec_jiffies,
4051 .strategy = &sysctl_jiffies,
4053 #ifdef CONFIG_IPV6_ROUTE_INFO
4055 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
4056 .procname = "accept_ra_rt_info_max_plen",
4057 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4058 .maxlen = sizeof(int),
4060 .proc_handler = &proc_dointvec,
4065 .ctl_name = NET_IPV6_PROXY_NDP,
4066 .procname = "proxy_ndp",
4067 .data = &ipv6_devconf.proxy_ndp,
4068 .maxlen = sizeof(int),
4070 .proc_handler = &proc_dointvec,
4073 .ctl_name = NET_IPV6_ACCEPT_SOURCE_ROUTE,
4074 .procname = "accept_source_route",
4075 .data = &ipv6_devconf.accept_source_route,
4076 .maxlen = sizeof(int),
4078 .proc_handler = &proc_dointvec,
4080 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4082 .ctl_name = CTL_UNNUMBERED,
4083 .procname = "optimistic_dad",
4084 .data = &ipv6_devconf.optimistic_dad,
4085 .maxlen = sizeof(int),
4087 .proc_handler = &proc_dointvec,
4092 .ctl_name = 0, /* sentinel */
4097 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4098 int ctl_name, struct inet6_dev *idev, struct ipv6_devconf *p)
4101 struct addrconf_sysctl_table *t;
4103 #define ADDRCONF_CTL_PATH_DEV 3
4105 struct ctl_path addrconf_ctl_path[] = {
4106 { .procname = "net", .ctl_name = CTL_NET, },
4107 { .procname = "ipv6", .ctl_name = NET_IPV6, },
4108 { .procname = "conf", .ctl_name = NET_IPV6_CONF, },
4109 { /* to be set */ },
4114 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4118 for (i=0; t->addrconf_vars[i].data; i++) {
4119 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
4120 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4121 t->addrconf_vars[i].extra2 = net;
4125 * Make a copy of dev_name, because '.procname' is regarded as const
4126 * by sysctl and we wouldn't want anyone to change it under our feet
4127 * (see SIOCSIFNAME).
4129 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4133 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4134 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].ctl_name = ctl_name;
4136 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4138 if (t->sysctl_header == NULL)
4152 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4154 struct addrconf_sysctl_table *t;
4156 if (p->sysctl == NULL)
4161 unregister_sysctl_table(t->sysctl_header);
4166 static void addrconf_sysctl_register(struct inet6_dev *idev)
4168 neigh_sysctl_register(idev->dev, idev->nd_parms, NET_IPV6,
4169 NET_IPV6_NEIGH, "ipv6",
4170 &ndisc_ifinfo_sysctl_change,
4172 __addrconf_sysctl_register(idev->dev->nd_net, idev->dev->name,
4173 idev->dev->ifindex, idev, &idev->cnf);
4176 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4178 __addrconf_sysctl_unregister(&idev->cnf);
4179 neigh_sysctl_unregister(idev->nd_parms);
4185 static int addrconf_init_net(struct net *net)
4188 struct ipv6_devconf *all, *dflt;
4191 all = &ipv6_devconf;
4192 dflt = &ipv6_devconf_dflt;
4194 if (net != &init_net) {
4195 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4199 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4201 goto err_alloc_dflt;
4204 net->ipv6.devconf_all = all;
4205 net->ipv6.devconf_dflt = dflt;
4207 #ifdef CONFIG_SYSCTL
4208 err = __addrconf_sysctl_register(net, "all", NET_PROTO_CONF_ALL,
4213 err = __addrconf_sysctl_register(net, "default", NET_PROTO_CONF_DEFAULT,
4220 #ifdef CONFIG_SYSCTL
4222 __addrconf_sysctl_unregister(all);
4232 static void addrconf_exit_net(struct net *net)
4234 #ifdef CONFIG_SYSCTL
4235 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4236 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4238 if (net != &init_net) {
4239 kfree(net->ipv6.devconf_dflt);
4240 kfree(net->ipv6.devconf_all);
4244 static struct pernet_operations addrconf_ops = {
4245 .init = addrconf_init_net,
4246 .exit = addrconf_exit_net,
4253 int register_inet6addr_notifier(struct notifier_block *nb)
4255 return atomic_notifier_chain_register(&inet6addr_chain, nb);
4258 EXPORT_SYMBOL(register_inet6addr_notifier);
4260 int unregister_inet6addr_notifier(struct notifier_block *nb)
4262 return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
4265 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4268 * Init / cleanup code
4271 int __init addrconf_init(void)
4275 if ((err = ipv6_addr_label_init()) < 0) {
4276 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n",
4281 register_pernet_subsys(&addrconf_ops);
4283 /* The addrconf netdev notifier requires that loopback_dev
4284 * has it's ipv6 private information allocated and setup
4285 * before it can bring up and give link-local addresses
4286 * to other devices which are up.
4288 * Unfortunately, loopback_dev is not necessarily the first
4289 * entry in the global dev_base list of net devices. In fact,
4290 * it is likely to be the very last entry on that list.
4291 * So this causes the notifier registry below to try and
4292 * give link-local addresses to all devices besides loopback_dev
4293 * first, then loopback_dev, which cases all the non-loopback_dev
4294 * devices to fail to get a link-local address.
4296 * So, as a temporary fix, allocate the ipv6 structure for
4297 * loopback_dev first by hand.
4298 * Longer term, all of the dependencies ipv6 has upon the loopback
4299 * device and it being up should be removed.
4302 if (!ipv6_add_dev(init_net.loopback_dev))
4308 ip6_null_entry.u.dst.dev = init_net.loopback_dev;
4309 ip6_null_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
4310 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
4311 ip6_prohibit_entry.u.dst.dev = init_net.loopback_dev;
4312 ip6_prohibit_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
4313 ip6_blk_hole_entry.u.dst.dev = init_net.loopback_dev;
4314 ip6_blk_hole_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
4317 register_netdevice_notifier(&ipv6_dev_notf);
4321 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4325 /* Only the first call to __rtnl_register can fail */
4326 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4327 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4328 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4329 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4330 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4332 ipv6_addr_label_rtnl_register();
4336 unregister_netdevice_notifier(&ipv6_dev_notf);
4338 unregister_pernet_subsys(&addrconf_ops);
4343 void addrconf_cleanup(void)
4345 struct net_device *dev;
4346 struct inet6_ifaddr *ifa;
4349 unregister_netdevice_notifier(&ipv6_dev_notf);
4351 unregister_pernet_subsys(&addrconf_ops);
4359 for_each_netdev(&init_net, dev) {
4360 if (__in6_dev_get(dev) == NULL)
4362 addrconf_ifdown(dev, 1);
4364 addrconf_ifdown(init_net.loopback_dev, 2);
4370 write_lock_bh(&addrconf_hash_lock);
4371 for (i=0; i < IN6_ADDR_HSIZE; i++) {
4372 for (ifa=inet6_addr_lst[i]; ifa; ) {
4373 struct inet6_ifaddr *bifa;
4376 ifa = ifa->lst_next;
4377 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4378 /* Do not free it; something is wrong.
4379 Now we can investigate it with debugger.
4383 write_unlock_bh(&addrconf_hash_lock);
4385 del_timer(&addr_chk_timer);