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, struct ipv6_devconf *p);
105 static void addrconf_sysctl_unregister(struct ipv6_devconf *p);
108 #ifdef CONFIG_IPV6_PRIVACY
109 static int __ipv6_regen_rndid(struct inet6_dev *idev);
110 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
111 static void ipv6_regen_rndid(unsigned long data);
113 static int desync_factor = MAX_DESYNC_FACTOR * HZ;
116 static int ipv6_count_addresses(struct inet6_dev *idev);
119 * Configured unicast address hash table
121 static struct inet6_ifaddr *inet6_addr_lst[IN6_ADDR_HSIZE];
122 static DEFINE_RWLOCK(addrconf_hash_lock);
124 static void addrconf_verify(unsigned long);
126 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
127 static DEFINE_SPINLOCK(addrconf_verify_lock);
129 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
130 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
132 static int addrconf_ifdown(struct net_device *dev, int how);
134 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
135 static void addrconf_dad_timer(unsigned long data);
136 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
137 static void addrconf_dad_run(struct inet6_dev *idev);
138 static void addrconf_rs_timer(unsigned long data);
139 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
140 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
142 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
143 struct prefix_info *pinfo);
144 static int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev);
146 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
148 struct ipv6_devconf ipv6_devconf __read_mostly = {
150 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
151 .mtu6 = IPV6_MIN_MTU,
153 .accept_redirects = 1,
155 .force_mld_version = 0,
157 .rtr_solicits = MAX_RTR_SOLICITATIONS,
158 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
159 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
160 #ifdef CONFIG_IPV6_PRIVACY
162 .temp_valid_lft = TEMP_VALID_LIFETIME,
163 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
164 .regen_max_retry = REGEN_MAX_RETRY,
165 .max_desync_factor = MAX_DESYNC_FACTOR,
167 .max_addresses = IPV6_MAX_ADDRESSES,
168 .accept_ra_defrtr = 1,
169 .accept_ra_pinfo = 1,
170 #ifdef CONFIG_IPV6_ROUTER_PREF
171 .accept_ra_rtr_pref = 1,
172 .rtr_probe_interval = 60 * HZ,
173 #ifdef CONFIG_IPV6_ROUTE_INFO
174 .accept_ra_rt_info_max_plen = 0,
178 .accept_source_route = 0, /* we do not accept RH0 by default. */
181 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
183 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
184 .mtu6 = IPV6_MIN_MTU,
186 .accept_redirects = 1,
189 .rtr_solicits = MAX_RTR_SOLICITATIONS,
190 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
191 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
192 #ifdef CONFIG_IPV6_PRIVACY
194 .temp_valid_lft = TEMP_VALID_LIFETIME,
195 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
196 .regen_max_retry = REGEN_MAX_RETRY,
197 .max_desync_factor = MAX_DESYNC_FACTOR,
199 .max_addresses = IPV6_MAX_ADDRESSES,
200 .accept_ra_defrtr = 1,
201 .accept_ra_pinfo = 1,
202 #ifdef CONFIG_IPV6_ROUTER_PREF
203 .accept_ra_rtr_pref = 1,
204 .rtr_probe_interval = 60 * HZ,
205 #ifdef CONFIG_IPV6_ROUTE_INFO
206 .accept_ra_rt_info_max_plen = 0,
210 .accept_source_route = 0, /* we do not accept RH0 by default. */
213 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
214 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
215 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
217 /* Check if a valid qdisc is available */
218 static inline int addrconf_qdisc_ok(struct net_device *dev)
220 return (dev->qdisc != &noop_qdisc);
223 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
225 if (del_timer(&ifp->timer))
229 enum addrconf_timer_t
236 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
237 enum addrconf_timer_t what,
240 if (!del_timer(&ifp->timer))
245 ifp->timer.function = addrconf_dad_timer;
248 ifp->timer.function = addrconf_rs_timer;
252 ifp->timer.expires = jiffies + when;
253 add_timer(&ifp->timer);
256 static int snmp6_alloc_dev(struct inet6_dev *idev)
258 if (snmp_mib_init((void **)idev->stats.ipv6,
259 sizeof(struct ipstats_mib),
260 __alignof__(struct ipstats_mib)) < 0)
262 if (snmp_mib_init((void **)idev->stats.icmpv6,
263 sizeof(struct icmpv6_mib),
264 __alignof__(struct icmpv6_mib)) < 0)
266 if (snmp_mib_init((void **)idev->stats.icmpv6msg,
267 sizeof(struct icmpv6msg_mib),
268 __alignof__(struct icmpv6msg_mib)) < 0)
274 snmp_mib_free((void **)idev->stats.icmpv6);
276 snmp_mib_free((void **)idev->stats.ipv6);
281 static void snmp6_free_dev(struct inet6_dev *idev)
283 snmp_mib_free((void **)idev->stats.icmpv6msg);
284 snmp_mib_free((void **)idev->stats.icmpv6);
285 snmp_mib_free((void **)idev->stats.ipv6);
288 /* Nobody refers to this device, we may destroy it. */
290 static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
292 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
296 void in6_dev_finish_destroy(struct inet6_dev *idev)
298 struct net_device *dev = idev->dev;
299 BUG_TRAP(idev->addr_list==NULL);
300 BUG_TRAP(idev->mc_list==NULL);
301 #ifdef NET_REFCNT_DEBUG
302 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
306 printk("Freeing alive inet6 device %p\n", idev);
309 snmp6_free_dev(idev);
310 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
313 EXPORT_SYMBOL(in6_dev_finish_destroy);
315 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
317 struct inet6_dev *ndev;
318 struct in6_addr maddr;
322 if (dev->mtu < IPV6_MIN_MTU)
325 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
330 rwlock_init(&ndev->lock);
332 memcpy(&ndev->cnf, &ipv6_devconf_dflt, sizeof(ndev->cnf));
333 ndev->cnf.mtu6 = dev->mtu;
334 ndev->cnf.sysctl = NULL;
335 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
336 if (ndev->nd_parms == NULL) {
340 /* We refer to the device */
343 if (snmp6_alloc_dev(ndev) < 0) {
345 "%s(): cannot allocate memory for statistics; dev=%s.\n",
346 __FUNCTION__, dev->name));
347 neigh_parms_release(&nd_tbl, ndev->nd_parms);
349 in6_dev_finish_destroy(ndev);
353 if (snmp6_register_dev(ndev) < 0) {
355 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
356 __FUNCTION__, dev->name));
357 neigh_parms_release(&nd_tbl, ndev->nd_parms);
359 in6_dev_finish_destroy(ndev);
363 /* One reference from device. We must do this before
364 * we invoke __ipv6_regen_rndid().
368 #ifdef CONFIG_IPV6_PRIVACY
369 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
370 if ((dev->flags&IFF_LOOPBACK) ||
371 dev->type == ARPHRD_TUNNEL ||
372 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
373 dev->type == ARPHRD_SIT ||
375 dev->type == ARPHRD_NONE) {
377 "%s: Disabled Privacy Extensions\n",
379 ndev->cnf.use_tempaddr = -1;
382 ipv6_regen_rndid((unsigned long) ndev);
386 if (netif_running(dev) && addrconf_qdisc_ok(dev))
387 ndev->if_flags |= IF_READY;
389 ipv6_mc_init_dev(ndev);
390 ndev->tstamp = jiffies;
392 neigh_sysctl_register(dev, ndev->nd_parms, NET_IPV6,
393 NET_IPV6_NEIGH, "ipv6",
394 &ndisc_ifinfo_sysctl_change,
396 addrconf_sysctl_register(ndev, &ndev->cnf);
398 /* protected by rtnl_lock */
399 rcu_assign_pointer(dev->ip6_ptr, ndev);
401 /* Join all-node multicast group */
402 ipv6_addr_all_nodes(&maddr);
403 ipv6_dev_mc_inc(dev, &maddr);
408 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
410 struct inet6_dev *idev;
414 if ((idev = __in6_dev_get(dev)) == NULL) {
415 if ((idev = ipv6_add_dev(dev)) == NULL)
419 if (dev->flags&IFF_UP)
425 static void dev_forward_change(struct inet6_dev *idev)
427 struct net_device *dev;
428 struct inet6_ifaddr *ifa;
429 struct in6_addr addr;
434 if (dev && (dev->flags & IFF_MULTICAST)) {
435 ipv6_addr_all_routers(&addr);
437 if (idev->cnf.forwarding)
438 ipv6_dev_mc_inc(dev, &addr);
440 ipv6_dev_mc_dec(dev, &addr);
442 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
443 if (ifa->flags&IFA_F_TENTATIVE)
445 if (idev->cnf.forwarding)
446 addrconf_join_anycast(ifa);
448 addrconf_leave_anycast(ifa);
453 static void addrconf_forward_change(void)
455 struct net_device *dev;
456 struct inet6_dev *idev;
458 read_lock(&dev_base_lock);
459 for_each_netdev(&init_net, dev) {
461 idev = __in6_dev_get(dev);
463 int changed = (!idev->cnf.forwarding) ^ (!ipv6_devconf.forwarding);
464 idev->cnf.forwarding = ipv6_devconf.forwarding;
466 dev_forward_change(idev);
470 read_unlock(&dev_base_lock);
474 /* Nobody refers to this ifaddr, destroy it */
476 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
478 BUG_TRAP(ifp->if_next==NULL);
479 BUG_TRAP(ifp->lst_next==NULL);
480 #ifdef NET_REFCNT_DEBUG
481 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
484 in6_dev_put(ifp->idev);
486 if (del_timer(&ifp->timer))
487 printk("Timer is still running, when freeing ifa=%p\n", ifp);
490 printk("Freeing alive inet6 address %p\n", ifp);
493 dst_release(&ifp->rt->u.dst);
499 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
501 struct inet6_ifaddr *ifa, **ifap;
502 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
505 * Each device address list is sorted in order of scope -
506 * global before linklocal.
508 for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
509 ifap = &ifa->if_next) {
510 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
514 ifp->if_next = *ifap;
518 /* On success it returns ifp with increased reference count */
520 static struct inet6_ifaddr *
521 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
522 int scope, u32 flags)
524 struct inet6_ifaddr *ifa = NULL;
531 err = -ENODEV; /*XXX*/
535 write_lock(&addrconf_hash_lock);
537 /* Ignore adding duplicate addresses on an interface */
538 if (ipv6_chk_same_addr(addr, idev->dev)) {
539 ADBG(("ipv6_add_addr: already assigned\n"));
544 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
547 ADBG(("ipv6_add_addr: malloc failed\n"));
552 rt = addrconf_dst_alloc(idev, addr, 0);
558 ipv6_addr_copy(&ifa->addr, addr);
560 spin_lock_init(&ifa->lock);
561 init_timer(&ifa->timer);
562 ifa->timer.data = (unsigned long) ifa;
564 ifa->prefix_len = pfxlen;
565 ifa->flags = flags | IFA_F_TENTATIVE;
566 ifa->cstamp = ifa->tstamp = jiffies;
571 * part one of RFC 4429, section 3.3
572 * We should not configure an address as
573 * optimistic if we do not yet know the link
574 * layer address of our nexhop router
577 if (rt->rt6i_nexthop == NULL)
578 ifa->flags &= ~IFA_F_OPTIMISTIC;
585 /* Add to big hash table */
586 hash = ipv6_addr_hash(addr);
588 ifa->lst_next = inet6_addr_lst[hash];
589 inet6_addr_lst[hash] = ifa;
591 write_unlock(&addrconf_hash_lock);
593 write_lock(&idev->lock);
594 /* Add to inet6_dev unicast addr list. */
595 ipv6_link_dev_addr(idev, ifa);
597 #ifdef CONFIG_IPV6_PRIVACY
598 if (ifa->flags&IFA_F_TEMPORARY) {
599 ifa->tmp_next = idev->tempaddr_list;
600 idev->tempaddr_list = ifa;
606 write_unlock(&idev->lock);
608 rcu_read_unlock_bh();
610 if (likely(err == 0))
611 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
619 write_unlock(&addrconf_hash_lock);
623 /* This function wants to get referenced ifp and releases it before return */
625 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
627 struct inet6_ifaddr *ifa, **ifap;
628 struct inet6_dev *idev = ifp->idev;
630 int deleted = 0, onlink = 0;
631 unsigned long expires = jiffies;
633 hash = ipv6_addr_hash(&ifp->addr);
637 write_lock_bh(&addrconf_hash_lock);
638 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
639 ifap = &ifa->lst_next) {
641 *ifap = ifa->lst_next;
643 ifa->lst_next = NULL;
647 write_unlock_bh(&addrconf_hash_lock);
649 write_lock_bh(&idev->lock);
650 #ifdef CONFIG_IPV6_PRIVACY
651 if (ifp->flags&IFA_F_TEMPORARY) {
652 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
653 ifap = &ifa->tmp_next) {
655 *ifap = ifa->tmp_next;
657 in6_ifa_put(ifp->ifpub);
661 ifa->tmp_next = NULL;
668 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
670 *ifap = ifa->if_next;
673 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
677 } else if (ifp->flags & IFA_F_PERMANENT) {
678 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
680 if (ifa->flags & IFA_F_PERMANENT) {
685 unsigned long lifetime;
690 spin_lock(&ifa->lock);
691 lifetime = min_t(unsigned long,
692 ifa->valid_lft, 0x7fffffffUL/HZ);
693 if (time_before(expires,
694 ifa->tstamp + lifetime * HZ))
695 expires = ifa->tstamp + lifetime * HZ;
696 spin_unlock(&ifa->lock);
700 ifap = &ifa->if_next;
702 write_unlock_bh(&idev->lock);
704 ipv6_ifa_notify(RTM_DELADDR, ifp);
706 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
708 addrconf_del_timer(ifp);
711 * Purge or update corresponding prefix
713 * 1) we don't purge prefix here if address was not permanent.
714 * prefix is managed by its own lifetime.
715 * 2) if there're no addresses, delete prefix.
716 * 3) if there're still other permanent address(es),
717 * corresponding prefix is still permanent.
718 * 4) otherwise, update prefix lifetime to the
719 * longest valid lifetime among the corresponding
720 * addresses on the device.
721 * Note: subsequent RA will update lifetime.
725 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
726 struct in6_addr prefix;
729 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
730 rt = rt6_lookup(&prefix, NULL, ifp->idev->dev->ifindex, 1);
732 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
736 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
737 rt->rt6i_expires = expires;
738 rt->rt6i_flags |= RTF_EXPIRES;
741 dst_release(&rt->u.dst);
747 #ifdef CONFIG_IPV6_PRIVACY
748 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
750 struct inet6_dev *idev = ifp->idev;
751 struct in6_addr addr, *tmpaddr;
752 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
758 write_lock(&idev->lock);
760 spin_lock_bh(&ift->lock);
761 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
762 spin_unlock_bh(&ift->lock);
769 if (idev->cnf.use_tempaddr <= 0) {
770 write_unlock(&idev->lock);
772 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
777 spin_lock_bh(&ifp->lock);
778 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
779 idev->cnf.use_tempaddr = -1; /*XXX*/
780 spin_unlock_bh(&ifp->lock);
781 write_unlock(&idev->lock);
783 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
789 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
790 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
791 spin_unlock_bh(&ifp->lock);
792 write_unlock(&idev->lock);
794 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
800 memcpy(&addr.s6_addr[8], idev->rndid, 8);
801 tmp_valid_lft = min_t(__u32,
803 idev->cnf.temp_valid_lft);
804 tmp_prefered_lft = min_t(__u32,
806 idev->cnf.temp_prefered_lft - desync_factor / HZ);
807 tmp_plen = ifp->prefix_len;
808 max_addresses = idev->cnf.max_addresses;
809 tmp_cstamp = ifp->cstamp;
810 tmp_tstamp = ifp->tstamp;
811 spin_unlock_bh(&ifp->lock);
813 write_unlock(&idev->lock);
815 addr_flags = IFA_F_TEMPORARY;
816 /* set in addrconf_prefix_rcv() */
817 if (ifp->flags & IFA_F_OPTIMISTIC)
818 addr_flags |= IFA_F_OPTIMISTIC;
820 ift = !max_addresses ||
821 ipv6_count_addresses(idev) < max_addresses ?
822 ipv6_add_addr(idev, &addr, tmp_plen,
823 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
825 if (!ift || IS_ERR(ift)) {
829 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
831 write_lock(&idev->lock);
835 spin_lock_bh(&ift->lock);
837 ift->valid_lft = tmp_valid_lft;
838 ift->prefered_lft = tmp_prefered_lft;
839 ift->cstamp = tmp_cstamp;
840 ift->tstamp = tmp_tstamp;
841 spin_unlock_bh(&ift->lock);
843 addrconf_dad_start(ift, 0);
852 * Choose an appropriate source address (RFC3484)
854 struct ipv6_saddr_score {
862 #define IPV6_SADDR_SCORE_LOCAL 0x0001
863 #define IPV6_SADDR_SCORE_PREFERRED 0x0004
864 #define IPV6_SADDR_SCORE_HOA 0x0008
865 #define IPV6_SADDR_SCORE_OIF 0x0010
866 #define IPV6_SADDR_SCORE_LABEL 0x0020
867 #define IPV6_SADDR_SCORE_PRIVACY 0x0040
869 static inline int ipv6_saddr_preferred(int type)
871 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
872 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
877 /* static matching label */
878 static inline int ipv6_addr_label(const struct in6_addr *addr, int type,
882 * prefix (longest match) label
883 * -----------------------------
892 if (type & IPV6_ADDR_LOOPBACK)
894 else if (type & IPV6_ADDR_COMPATv4)
896 else if (type & IPV6_ADDR_MAPPED)
898 else if (addr->s6_addr32[0] == htonl(0x20010000))
900 else if (addr->s6_addr16[0] == htons(0x2002))
902 else if ((addr->s6_addr[0] & 0xfe) == 0xfc)
907 int ipv6_dev_get_saddr(struct net_device *daddr_dev,
908 struct in6_addr *daddr, struct in6_addr *saddr)
910 struct ipv6_saddr_score hiscore;
911 struct inet6_ifaddr *ifa_result = NULL;
912 int daddr_type = __ipv6_addr_type(daddr);
913 int daddr_scope = __ipv6_addr_src_scope(daddr_type);
914 int daddr_ifindex = daddr_dev ? daddr_dev->ifindex : 0;
915 u32 daddr_label = ipv6_addr_label(daddr, daddr_type, daddr_ifindex);
916 struct net_device *dev;
918 memset(&hiscore, 0, sizeof(hiscore));
920 read_lock(&dev_base_lock);
923 for_each_netdev(&init_net, dev) {
924 struct inet6_dev *idev;
925 struct inet6_ifaddr *ifa;
927 /* Rule 0: Candidate Source Address (section 4)
928 * - multicast and link-local destination address,
929 * the set of candidate source address MUST only
930 * include addresses assigned to interfaces
931 * belonging to the same link as the outgoing
933 * (- For site-local destination addresses, the
934 * set of candidate source addresses MUST only
935 * include addresses assigned to interfaces
936 * belonging to the same site as the outgoing
939 if ((daddr_type & IPV6_ADDR_MULTICAST ||
940 daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
941 daddr_dev && dev != daddr_dev)
944 idev = __in6_dev_get(dev);
948 read_lock_bh(&idev->lock);
949 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
950 struct ipv6_saddr_score score;
952 score.addr_type = __ipv6_addr_type(&ifa->addr);
955 * - Tentative Address (RFC2462 section 5.4)
956 * - A tentative address is not considered
957 * "assigned to an interface" in the traditional
958 * sense, unless it is also flagged as optimistic.
959 * - Candidate Source Address (section 4)
960 * - In any case, anycast addresses, multicast
961 * addresses, and the unspecified address MUST
962 * NOT be included in a candidate set.
964 if ((ifa->flags & IFA_F_TENTATIVE) &&
965 (!(ifa->flags & IFA_F_OPTIMISTIC)))
967 if (unlikely(score.addr_type == IPV6_ADDR_ANY ||
968 score.addr_type & IPV6_ADDR_MULTICAST)) {
969 LIMIT_NETDEBUG(KERN_DEBUG
970 "ADDRCONF: unspecified / multicast address "
971 "assigned as unicast address on %s",
981 if (ifa_result == NULL) {
982 /* record it if the first available entry */
986 /* Rule 1: Prefer same address */
987 if (hiscore.rule < 1) {
988 if (ipv6_addr_equal(&ifa_result->addr, daddr))
989 hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL;
992 if (ipv6_addr_equal(&ifa->addr, daddr)) {
993 score.attrs |= IPV6_SADDR_SCORE_LOCAL;
994 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) {
999 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)
1003 /* Rule 2: Prefer appropriate scope */
1004 if (hiscore.rule < 2) {
1005 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type);
1008 score.scope = __ipv6_addr_src_scope(score.addr_type);
1009 if (hiscore.scope < score.scope) {
1010 if (hiscore.scope < daddr_scope) {
1015 } else if (score.scope < hiscore.scope) {
1016 if (score.scope < daddr_scope)
1017 break; /* addresses sorted by scope */
1024 /* Rule 3: Avoid deprecated and optimistic addresses */
1025 if (hiscore.rule < 3) {
1026 if (ipv6_saddr_preferred(hiscore.addr_type) ||
1027 (((ifa_result->flags &
1028 (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0)))
1029 hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1032 if (ipv6_saddr_preferred(score.addr_type) ||
1034 (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0))) {
1035 score.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1036 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) {
1041 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)
1045 /* Rule 4: Prefer home address */
1046 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
1047 if (hiscore.rule < 4) {
1048 if (ifa_result->flags & IFA_F_HOMEADDRESS)
1049 hiscore.attrs |= IPV6_SADDR_SCORE_HOA;
1052 if (ifa->flags & IFA_F_HOMEADDRESS) {
1053 score.attrs |= IPV6_SADDR_SCORE_HOA;
1054 if (!(ifa_result->flags & IFA_F_HOMEADDRESS)) {
1059 if (hiscore.attrs & IPV6_SADDR_SCORE_HOA)
1063 if (hiscore.rule < 4)
1067 /* Rule 5: Prefer outgoing interface */
1068 if (hiscore.rule < 5) {
1069 if (daddr_dev == NULL ||
1070 daddr_dev == ifa_result->idev->dev)
1071 hiscore.attrs |= IPV6_SADDR_SCORE_OIF;
1074 if (daddr_dev == NULL ||
1075 daddr_dev == ifa->idev->dev) {
1076 score.attrs |= IPV6_SADDR_SCORE_OIF;
1077 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) {
1082 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF)
1086 /* Rule 6: Prefer matching label */
1087 if (hiscore.rule < 6) {
1088 if (ipv6_addr_label(&ifa_result->addr,
1090 ifa_result->idev->dev->ifindex) == daddr_label)
1091 hiscore.attrs |= IPV6_SADDR_SCORE_LABEL;
1094 if (ipv6_addr_label(&ifa->addr,
1096 ifa->idev->dev->ifindex) == daddr_label) {
1097 score.attrs |= IPV6_SADDR_SCORE_LABEL;
1098 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) {
1103 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL)
1107 #ifdef CONFIG_IPV6_PRIVACY
1108 /* Rule 7: Prefer public address
1109 * Note: prefer temprary address if use_tempaddr >= 2
1111 if (hiscore.rule < 7) {
1112 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^
1113 (ifa_result->idev->cnf.use_tempaddr >= 2))
1114 hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1117 if ((!(ifa->flags & IFA_F_TEMPORARY)) ^
1118 (ifa->idev->cnf.use_tempaddr >= 2)) {
1119 score.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1120 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) {
1125 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)
1129 if (hiscore.rule < 7)
1132 /* Rule 8: Use longest matching prefix */
1133 if (hiscore.rule < 8) {
1134 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
1137 score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
1138 if (score.matchlen > hiscore.matchlen) {
1143 else if (score.matchlen < hiscore.matchlen)
1147 /* Final Rule: choose first available one */
1151 in6_ifa_put(ifa_result);
1156 read_unlock_bh(&idev->lock);
1159 read_unlock(&dev_base_lock);
1162 return -EADDRNOTAVAIL;
1164 ipv6_addr_copy(saddr, &ifa_result->addr);
1165 in6_ifa_put(ifa_result);
1170 int ipv6_get_saddr(struct dst_entry *dst,
1171 struct in6_addr *daddr, struct in6_addr *saddr)
1173 return ipv6_dev_get_saddr(dst ? ip6_dst_idev(dst)->dev : NULL, daddr, saddr);
1176 EXPORT_SYMBOL(ipv6_get_saddr);
1178 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1179 unsigned char banned_flags)
1181 struct inet6_dev *idev;
1182 int err = -EADDRNOTAVAIL;
1185 if ((idev = __in6_dev_get(dev)) != NULL) {
1186 struct inet6_ifaddr *ifp;
1188 read_lock_bh(&idev->lock);
1189 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1190 if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1191 ipv6_addr_copy(addr, &ifp->addr);
1196 read_unlock_bh(&idev->lock);
1202 static int ipv6_count_addresses(struct inet6_dev *idev)
1205 struct inet6_ifaddr *ifp;
1207 read_lock_bh(&idev->lock);
1208 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1210 read_unlock_bh(&idev->lock);
1214 int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict)
1216 struct inet6_ifaddr * ifp;
1217 u8 hash = ipv6_addr_hash(addr);
1219 read_lock_bh(&addrconf_hash_lock);
1220 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1221 if (ipv6_addr_equal(&ifp->addr, addr) &&
1222 !(ifp->flags&IFA_F_TENTATIVE)) {
1223 if (dev == NULL || ifp->idev->dev == dev ||
1224 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1228 read_unlock_bh(&addrconf_hash_lock);
1232 EXPORT_SYMBOL(ipv6_chk_addr);
1235 int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev)
1237 struct inet6_ifaddr * ifp;
1238 u8 hash = ipv6_addr_hash(addr);
1240 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1241 if (ipv6_addr_equal(&ifp->addr, addr)) {
1242 if (dev == NULL || ifp->idev->dev == dev)
1249 struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict)
1251 struct inet6_ifaddr * ifp;
1252 u8 hash = ipv6_addr_hash(addr);
1254 read_lock_bh(&addrconf_hash_lock);
1255 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1256 if (ipv6_addr_equal(&ifp->addr, addr)) {
1257 if (dev == NULL || ifp->idev->dev == dev ||
1258 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1264 read_unlock_bh(&addrconf_hash_lock);
1269 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1271 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1272 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
1273 __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1274 __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1275 int sk_ipv6only = ipv6_only_sock(sk);
1276 int sk2_ipv6only = inet_v6_ipv6only(sk2);
1277 int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1278 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1280 if (!sk2_rcv_saddr && !sk_ipv6only)
1283 if (addr_type2 == IPV6_ADDR_ANY &&
1284 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1287 if (addr_type == IPV6_ADDR_ANY &&
1288 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1291 if (sk2_rcv_saddr6 &&
1292 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1295 if (addr_type == IPV6_ADDR_MAPPED &&
1297 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1303 /* Gets referenced address, destroys ifaddr */
1305 static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1307 if (ifp->flags&IFA_F_PERMANENT) {
1308 spin_lock_bh(&ifp->lock);
1309 addrconf_del_timer(ifp);
1310 ifp->flags |= IFA_F_TENTATIVE;
1311 spin_unlock_bh(&ifp->lock);
1313 #ifdef CONFIG_IPV6_PRIVACY
1314 } else if (ifp->flags&IFA_F_TEMPORARY) {
1315 struct inet6_ifaddr *ifpub;
1316 spin_lock_bh(&ifp->lock);
1319 in6_ifa_hold(ifpub);
1320 spin_unlock_bh(&ifp->lock);
1321 ipv6_create_tempaddr(ifpub, ifp);
1324 spin_unlock_bh(&ifp->lock);
1332 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1334 if (net_ratelimit())
1335 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1336 addrconf_dad_stop(ifp);
1339 /* Join to solicited addr multicast group. */
1341 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1343 struct in6_addr maddr;
1345 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1348 addrconf_addr_solict_mult(addr, &maddr);
1349 ipv6_dev_mc_inc(dev, &maddr);
1352 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1354 struct in6_addr maddr;
1356 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1359 addrconf_addr_solict_mult(addr, &maddr);
1360 __ipv6_dev_mc_dec(idev, &maddr);
1363 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1365 struct in6_addr addr;
1366 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1367 if (ipv6_addr_any(&addr))
1369 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1372 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1374 struct in6_addr addr;
1375 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1376 if (ipv6_addr_any(&addr))
1378 __ipv6_dev_ac_dec(ifp->idev, &addr);
1381 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1383 if (dev->addr_len != ETH_ALEN)
1385 memcpy(eui, dev->dev_addr, 3);
1386 memcpy(eui + 5, dev->dev_addr + 3, 3);
1389 * The zSeries OSA network cards can be shared among various
1390 * OS instances, but the OSA cards have only one MAC address.
1391 * This leads to duplicate address conflicts in conjunction
1392 * with IPv6 if more than one instance uses the same card.
1394 * The driver for these cards can deliver a unique 16-bit
1395 * identifier for each instance sharing the same card. It is
1396 * placed instead of 0xFFFE in the interface identifier. The
1397 * "u" bit of the interface identifier is not inverted in this
1398 * case. Hence the resulting interface identifier has local
1399 * scope according to RFC2373.
1402 eui[3] = (dev->dev_id >> 8) & 0xFF;
1403 eui[4] = dev->dev_id & 0xFF;
1412 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1414 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1415 if (dev->addr_len != ARCNET_ALEN)
1418 eui[7] = *(u8*)dev->dev_addr;
1422 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1424 if (dev->addr_len != INFINIBAND_ALEN)
1426 memcpy(eui, dev->dev_addr + 12, 8);
1431 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1433 switch (dev->type) {
1436 case ARPHRD_IEEE802_TR:
1437 return addrconf_ifid_eui48(eui, dev);
1439 return addrconf_ifid_arcnet(eui, dev);
1440 case ARPHRD_INFINIBAND:
1441 return addrconf_ifid_infiniband(eui, dev);
1446 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1449 struct inet6_ifaddr *ifp;
1451 read_lock_bh(&idev->lock);
1452 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1453 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1454 memcpy(eui, ifp->addr.s6_addr+8, 8);
1459 read_unlock_bh(&idev->lock);
1463 #ifdef CONFIG_IPV6_PRIVACY
1464 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1465 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1468 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1469 idev->rndid[0] &= ~0x02;
1472 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1473 * check if generated address is not inappropriate
1475 * - Reserved subnet anycast (RFC 2526)
1476 * 11111101 11....11 1xxxxxxx
1477 * - ISATAP (draft-ietf-ngtrans-isatap-13.txt) 5.1
1478 * 00-00-5E-FE-xx-xx-xx-xx
1480 * - XXX: already assigned to an address on the device
1482 if (idev->rndid[0] == 0xfd &&
1483 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1484 (idev->rndid[7]&0x80))
1486 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1487 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1489 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1496 static void ipv6_regen_rndid(unsigned long data)
1498 struct inet6_dev *idev = (struct inet6_dev *) data;
1499 unsigned long expires;
1502 write_lock_bh(&idev->lock);
1507 if (__ipv6_regen_rndid(idev) < 0)
1511 idev->cnf.temp_prefered_lft * HZ -
1512 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1513 if (time_before(expires, jiffies)) {
1515 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1520 if (!mod_timer(&idev->regen_timer, expires))
1524 write_unlock_bh(&idev->lock);
1525 rcu_read_unlock_bh();
1529 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1532 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1533 ret = __ipv6_regen_rndid(idev);
1543 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1544 unsigned long expires, u32 flags)
1546 struct fib6_config cfg = {
1547 .fc_table = RT6_TABLE_PREFIX,
1548 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1549 .fc_ifindex = dev->ifindex,
1550 .fc_expires = expires,
1552 .fc_flags = RTF_UP | flags,
1555 ipv6_addr_copy(&cfg.fc_dst, pfx);
1557 /* Prevent useless cloning on PtP SIT.
1558 This thing is done here expecting that the whole
1559 class of non-broadcast devices need not cloning.
1561 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1562 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1563 cfg.fc_flags |= RTF_NONEXTHOP;
1566 ip6_route_add(&cfg);
1569 /* Create "default" multicast route to the interface */
1571 static void addrconf_add_mroute(struct net_device *dev)
1573 struct fib6_config cfg = {
1574 .fc_table = RT6_TABLE_LOCAL,
1575 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1576 .fc_ifindex = dev->ifindex,
1581 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1583 ip6_route_add(&cfg);
1586 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1587 static void sit_route_add(struct net_device *dev)
1589 struct fib6_config cfg = {
1590 .fc_table = RT6_TABLE_MAIN,
1591 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1592 .fc_ifindex = dev->ifindex,
1594 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1597 /* prefix length - 96 bits "::d.d.d.d" */
1598 ip6_route_add(&cfg);
1602 static void addrconf_add_lroute(struct net_device *dev)
1604 struct in6_addr addr;
1606 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1607 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1610 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1612 struct inet6_dev *idev;
1616 if ((idev = ipv6_find_idev(dev)) == NULL)
1619 /* Add default multicast route */
1620 addrconf_add_mroute(dev);
1622 /* Add link local route */
1623 addrconf_add_lroute(dev);
1627 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1629 struct prefix_info *pinfo;
1633 unsigned long rt_expires;
1634 struct inet6_dev *in6_dev;
1636 pinfo = (struct prefix_info *) opt;
1638 if (len < sizeof(struct prefix_info)) {
1639 ADBG(("addrconf: prefix option too short\n"));
1644 * Validation checks ([ADDRCONF], page 19)
1647 addr_type = ipv6_addr_type(&pinfo->prefix);
1649 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1652 valid_lft = ntohl(pinfo->valid);
1653 prefered_lft = ntohl(pinfo->prefered);
1655 if (prefered_lft > valid_lft) {
1656 if (net_ratelimit())
1657 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1661 in6_dev = in6_dev_get(dev);
1663 if (in6_dev == NULL) {
1664 if (net_ratelimit())
1665 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1670 * Two things going on here:
1671 * 1) Add routes for on-link prefixes
1672 * 2) Configure prefixes with the auto flag set
1675 /* Avoid arithmetic overflow. Really, we could
1676 save rt_expires in seconds, likely valid_lft,
1677 but it would require division in fib gc, that it
1680 if (valid_lft >= 0x7FFFFFFF/HZ)
1681 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1683 rt_expires = valid_lft * HZ;
1686 * We convert this (in jiffies) to clock_t later.
1687 * Avoid arithmetic overflow there as well.
1688 * Overflow can happen only if HZ < USER_HZ.
1690 if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1691 rt_expires = 0x7FFFFFFF / USER_HZ;
1693 if (pinfo->onlink) {
1694 struct rt6_info *rt;
1695 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1697 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1698 if (rt->rt6i_flags&RTF_EXPIRES) {
1699 if (valid_lft == 0) {
1703 rt->rt6i_expires = jiffies + rt_expires;
1706 } else if (valid_lft) {
1707 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1708 dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1711 dst_release(&rt->u.dst);
1714 /* Try to figure out our local address for this prefix */
1716 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1717 struct inet6_ifaddr * ifp;
1718 struct in6_addr addr;
1719 int create = 0, update_lft = 0;
1721 if (pinfo->prefix_len == 64) {
1722 memcpy(&addr, &pinfo->prefix, 8);
1723 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1724 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1725 in6_dev_put(in6_dev);
1730 if (net_ratelimit())
1731 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1733 in6_dev_put(in6_dev);
1738 ifp = ipv6_get_ifaddr(&addr, dev, 1);
1740 if (ifp == NULL && valid_lft) {
1741 int max_addresses = in6_dev->cnf.max_addresses;
1744 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1745 if (in6_dev->cnf.optimistic_dad &&
1746 !ipv6_devconf.forwarding)
1747 addr_flags = IFA_F_OPTIMISTIC;
1750 /* Do not allow to create too much of autoconfigured
1751 * addresses; this would be too easy way to crash kernel.
1753 if (!max_addresses ||
1754 ipv6_count_addresses(in6_dev) < max_addresses)
1755 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1756 addr_type&IPV6_ADDR_SCOPE_MASK,
1759 if (!ifp || IS_ERR(ifp)) {
1760 in6_dev_put(in6_dev);
1764 update_lft = create = 1;
1765 ifp->cstamp = jiffies;
1766 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1772 #ifdef CONFIG_IPV6_PRIVACY
1773 struct inet6_ifaddr *ift;
1777 /* update lifetime (RFC2462 5.5.3 e) */
1778 spin_lock(&ifp->lock);
1780 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1781 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1784 if (!update_lft && stored_lft) {
1785 if (valid_lft > MIN_VALID_LIFETIME ||
1786 valid_lft > stored_lft)
1788 else if (stored_lft <= MIN_VALID_LIFETIME) {
1789 /* valid_lft <= stored_lft is always true */
1793 valid_lft = MIN_VALID_LIFETIME;
1794 if (valid_lft < prefered_lft)
1795 prefered_lft = valid_lft;
1801 ifp->valid_lft = valid_lft;
1802 ifp->prefered_lft = prefered_lft;
1805 ifp->flags &= ~IFA_F_DEPRECATED;
1806 spin_unlock(&ifp->lock);
1808 if (!(flags&IFA_F_TENTATIVE))
1809 ipv6_ifa_notify(0, ifp);
1811 spin_unlock(&ifp->lock);
1813 #ifdef CONFIG_IPV6_PRIVACY
1814 read_lock_bh(&in6_dev->lock);
1815 /* update all temporary addresses in the list */
1816 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1818 * When adjusting the lifetimes of an existing
1819 * temporary address, only lower the lifetimes.
1820 * Implementations must not increase the
1821 * lifetimes of an existing temporary address
1822 * when processing a Prefix Information Option.
1824 spin_lock(&ift->lock);
1826 if (ift->valid_lft > valid_lft &&
1827 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1828 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1829 if (ift->prefered_lft > prefered_lft &&
1830 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1831 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1832 spin_unlock(&ift->lock);
1833 if (!(flags&IFA_F_TENTATIVE))
1834 ipv6_ifa_notify(0, ift);
1837 if (create && in6_dev->cnf.use_tempaddr > 0) {
1839 * When a new public address is created as described in [ADDRCONF],
1840 * also create a new temporary address.
1842 read_unlock_bh(&in6_dev->lock);
1843 ipv6_create_tempaddr(ifp, NULL);
1845 read_unlock_bh(&in6_dev->lock);
1852 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1853 in6_dev_put(in6_dev);
1857 * Set destination address.
1858 * Special case for SIT interfaces where we create a new "virtual"
1861 int addrconf_set_dstaddr(void __user *arg)
1863 struct in6_ifreq ireq;
1864 struct net_device *dev;
1870 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1873 dev = __dev_get_by_index(&init_net, ireq.ifr6_ifindex);
1879 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1880 if (dev->type == ARPHRD_SIT) {
1883 struct ip_tunnel_parm p;
1885 err = -EADDRNOTAVAIL;
1886 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1889 memset(&p, 0, sizeof(p));
1890 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1894 p.iph.protocol = IPPROTO_IPV6;
1896 ifr.ifr_ifru.ifru_data = (void __user *)&p;
1898 oldfs = get_fs(); set_fs(KERNEL_DS);
1899 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1904 if ((dev = __dev_get_by_name(&init_net, p.name)) == NULL)
1906 err = dev_open(dev);
1917 * Manual configuration of address on an interface
1919 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen,
1920 __u8 ifa_flags, __u32 prefered_lft, __u32 valid_lft)
1922 struct inet6_ifaddr *ifp;
1923 struct inet6_dev *idev;
1924 struct net_device *dev;
1926 u32 flags = RTF_EXPIRES;
1930 /* check the lifetime */
1931 if (!valid_lft || prefered_lft > valid_lft)
1934 if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL)
1937 if ((idev = addrconf_add_dev(dev)) == NULL)
1940 scope = ipv6_addr_scope(pfx);
1942 if (valid_lft == INFINITY_LIFE_TIME) {
1943 ifa_flags |= IFA_F_PERMANENT;
1945 } else if (valid_lft >= 0x7FFFFFFF/HZ)
1946 valid_lft = 0x7FFFFFFF/HZ;
1948 if (prefered_lft == 0)
1949 ifa_flags |= IFA_F_DEPRECATED;
1950 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
1951 (prefered_lft != INFINITY_LIFE_TIME))
1952 prefered_lft = 0x7FFFFFFF/HZ;
1954 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
1957 spin_lock_bh(&ifp->lock);
1958 ifp->valid_lft = valid_lft;
1959 ifp->prefered_lft = prefered_lft;
1960 ifp->tstamp = jiffies;
1961 spin_unlock_bh(&ifp->lock);
1963 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
1964 jiffies_to_clock_t(valid_lft * HZ), flags);
1966 * Note that section 3.1 of RFC 4429 indicates
1967 * that the Optimistic flag should not be set for
1968 * manually configured addresses
1970 addrconf_dad_start(ifp, 0);
1976 return PTR_ERR(ifp);
1979 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1981 struct inet6_ifaddr *ifp;
1982 struct inet6_dev *idev;
1983 struct net_device *dev;
1985 if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL)
1988 if ((idev = __in6_dev_get(dev)) == NULL)
1991 read_lock_bh(&idev->lock);
1992 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
1993 if (ifp->prefix_len == plen &&
1994 ipv6_addr_equal(pfx, &ifp->addr)) {
1996 read_unlock_bh(&idev->lock);
2000 /* If the last address is deleted administratively,
2001 disable IPv6 on this interface.
2003 if (idev->addr_list == NULL)
2004 addrconf_ifdown(idev->dev, 1);
2008 read_unlock_bh(&idev->lock);
2009 return -EADDRNOTAVAIL;
2013 int addrconf_add_ifaddr(void __user *arg)
2015 struct in6_ifreq ireq;
2018 if (!capable(CAP_NET_ADMIN))
2021 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2025 err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen,
2026 IFA_F_PERMANENT, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2031 int addrconf_del_ifaddr(void __user *arg)
2033 struct in6_ifreq ireq;
2036 if (!capable(CAP_NET_ADMIN))
2039 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2043 err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
2048 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2049 static void sit_add_v4_addrs(struct inet6_dev *idev)
2051 struct inet6_ifaddr * ifp;
2052 struct in6_addr addr;
2053 struct net_device *dev;
2058 memset(&addr, 0, sizeof(struct in6_addr));
2059 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2061 if (idev->dev->flags&IFF_POINTOPOINT) {
2062 addr.s6_addr32[0] = htonl(0xfe800000);
2065 scope = IPV6_ADDR_COMPATv4;
2068 if (addr.s6_addr32[3]) {
2069 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
2071 spin_lock_bh(&ifp->lock);
2072 ifp->flags &= ~IFA_F_TENTATIVE;
2073 spin_unlock_bh(&ifp->lock);
2074 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2080 for_each_netdev(&init_net, dev) {
2081 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2082 if (in_dev && (dev->flags & IFF_UP)) {
2083 struct in_ifaddr * ifa;
2087 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2090 addr.s6_addr32[3] = ifa->ifa_local;
2092 if (ifa->ifa_scope == RT_SCOPE_LINK)
2094 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2095 if (idev->dev->flags&IFF_POINTOPOINT)
2099 if (idev->dev->flags&IFF_POINTOPOINT)
2104 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2107 spin_lock_bh(&ifp->lock);
2108 ifp->flags &= ~IFA_F_TENTATIVE;
2109 spin_unlock_bh(&ifp->lock);
2110 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2119 static void init_loopback(struct net_device *dev)
2121 struct inet6_dev *idev;
2122 struct inet6_ifaddr * ifp;
2128 if ((idev = ipv6_find_idev(dev)) == NULL) {
2129 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2133 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2135 spin_lock_bh(&ifp->lock);
2136 ifp->flags &= ~IFA_F_TENTATIVE;
2137 spin_unlock_bh(&ifp->lock);
2138 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2143 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2145 struct inet6_ifaddr * ifp;
2146 u32 addr_flags = IFA_F_PERMANENT;
2148 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2149 if (idev->cnf.optimistic_dad &&
2150 !ipv6_devconf.forwarding)
2151 addr_flags |= IFA_F_OPTIMISTIC;
2155 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2157 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2158 addrconf_dad_start(ifp, 0);
2163 static void addrconf_dev_config(struct net_device *dev)
2165 struct in6_addr addr;
2166 struct inet6_dev * idev;
2170 if ((dev->type != ARPHRD_ETHER) &&
2171 (dev->type != ARPHRD_FDDI) &&
2172 (dev->type != ARPHRD_IEEE802_TR) &&
2173 (dev->type != ARPHRD_ARCNET) &&
2174 (dev->type != ARPHRD_INFINIBAND)) {
2175 /* Alas, we support only Ethernet autoconfiguration. */
2179 idev = addrconf_add_dev(dev);
2183 memset(&addr, 0, sizeof(struct in6_addr));
2184 addr.s6_addr32[0] = htonl(0xFE800000);
2186 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2187 addrconf_add_linklocal(idev, &addr);
2190 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2191 static void addrconf_sit_config(struct net_device *dev)
2193 struct inet6_dev *idev;
2198 * Configure the tunnel with one of our IPv4
2199 * addresses... we should configure all of
2200 * our v4 addrs in the tunnel
2203 if ((idev = ipv6_find_idev(dev)) == NULL) {
2204 printk(KERN_DEBUG "init sit: add_dev failed\n");
2208 sit_add_v4_addrs(idev);
2210 if (dev->flags&IFF_POINTOPOINT) {
2211 addrconf_add_mroute(dev);
2212 addrconf_add_lroute(dev);
2219 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2221 struct in6_addr lladdr;
2223 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2224 addrconf_add_linklocal(idev, &lladdr);
2230 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2232 struct net_device *link_dev;
2234 /* first try to inherit the link-local address from the link device */
2235 if (idev->dev->iflink &&
2236 (link_dev = __dev_get_by_index(&init_net, idev->dev->iflink))) {
2237 if (!ipv6_inherit_linklocal(idev, link_dev))
2240 /* then try to inherit it from any device */
2241 for_each_netdev(&init_net, link_dev) {
2242 if (!ipv6_inherit_linklocal(idev, link_dev))
2245 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2249 * Autoconfigure tunnel with a link-local address so routing protocols,
2250 * DHCPv6, MLD etc. can be run over the virtual link
2253 static void addrconf_ip6_tnl_config(struct net_device *dev)
2255 struct inet6_dev *idev;
2259 if ((idev = addrconf_add_dev(dev)) == NULL) {
2260 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2263 ip6_tnl_add_linklocal(idev);
2266 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2269 struct net_device *dev = (struct net_device *) data;
2270 struct inet6_dev *idev = __in6_dev_get(dev);
2271 int run_pending = 0;
2274 if (dev->nd_net != &init_net)
2278 case NETDEV_REGISTER:
2279 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2280 idev = ipv6_add_dev(dev);
2282 return notifier_from_errno(-ENOMEM);
2287 if (dev->flags & IFF_SLAVE)
2290 if (event == NETDEV_UP) {
2291 if (!addrconf_qdisc_ok(dev)) {
2292 /* device is not ready yet. */
2294 "ADDRCONF(NETDEV_UP): %s: "
2295 "link is not ready\n",
2300 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2301 idev = ipv6_add_dev(dev);
2304 idev->if_flags |= IF_READY;
2306 if (!addrconf_qdisc_ok(dev)) {
2307 /* device is still not ready. */
2312 if (idev->if_flags & IF_READY) {
2313 /* device is already configured. */
2316 idev->if_flags |= IF_READY;
2320 "ADDRCONF(NETDEV_CHANGE): %s: "
2321 "link becomes ready\n",
2328 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2330 addrconf_sit_config(dev);
2333 case ARPHRD_TUNNEL6:
2334 addrconf_ip6_tnl_config(dev);
2336 case ARPHRD_LOOPBACK:
2341 addrconf_dev_config(dev);
2346 addrconf_dad_run(idev);
2348 /* If the MTU changed during the interface down, when the
2349 interface up, the changed MTU must be reflected in the
2350 idev as well as routers.
2352 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2353 rt6_mtu_change(dev, dev->mtu);
2354 idev->cnf.mtu6 = dev->mtu;
2356 idev->tstamp = jiffies;
2357 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2358 /* If the changed mtu during down is lower than IPV6_MIN_MTU
2359 stop IPv6 on this interface.
2361 if (dev->mtu < IPV6_MIN_MTU)
2362 addrconf_ifdown(dev, event != NETDEV_DOWN);
2366 case NETDEV_CHANGEMTU:
2367 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2368 rt6_mtu_change(dev, dev->mtu);
2369 idev->cnf.mtu6 = dev->mtu;
2373 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2374 idev = ipv6_add_dev(dev);
2379 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2382 case NETDEV_UNREGISTER:
2384 * Remove all addresses from this interface.
2386 addrconf_ifdown(dev, event != NETDEV_DOWN);
2389 case NETDEV_CHANGENAME:
2391 snmp6_unregister_dev(idev);
2392 #ifdef CONFIG_SYSCTL
2393 addrconf_sysctl_unregister(&idev->cnf);
2394 neigh_sysctl_unregister(idev->nd_parms);
2395 neigh_sysctl_register(dev, idev->nd_parms,
2396 NET_IPV6, NET_IPV6_NEIGH, "ipv6",
2397 &ndisc_ifinfo_sysctl_change,
2399 addrconf_sysctl_register(idev, &idev->cnf);
2401 err = snmp6_register_dev(idev);
2403 return notifier_from_errno(err);
2412 * addrconf module should be notified of a device going up
2414 static struct notifier_block ipv6_dev_notf = {
2415 .notifier_call = addrconf_notify,
2419 static int addrconf_ifdown(struct net_device *dev, int how)
2421 struct inet6_dev *idev;
2422 struct inet6_ifaddr *ifa, **bifa;
2427 if (dev == init_net.loopback_dev && how == 1)
2431 neigh_ifdown(&nd_tbl, dev);
2433 idev = __in6_dev_get(dev);
2437 /* Step 1: remove reference to ipv6 device from parent device.
2443 /* protected by rtnl_lock */
2444 rcu_assign_pointer(dev->ip6_ptr, NULL);
2446 /* Step 1.5: remove snmp6 entry */
2447 snmp6_unregister_dev(idev);
2451 /* Step 2: clear hash table */
2452 for (i=0; i<IN6_ADDR_HSIZE; i++) {
2453 bifa = &inet6_addr_lst[i];
2455 write_lock_bh(&addrconf_hash_lock);
2456 while ((ifa = *bifa) != NULL) {
2457 if (ifa->idev == idev) {
2458 *bifa = ifa->lst_next;
2459 ifa->lst_next = NULL;
2460 addrconf_del_timer(ifa);
2464 bifa = &ifa->lst_next;
2466 write_unlock_bh(&addrconf_hash_lock);
2469 write_lock_bh(&idev->lock);
2471 /* Step 3: clear flags for stateless addrconf */
2473 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2475 /* Step 4: clear address list */
2476 #ifdef CONFIG_IPV6_PRIVACY
2477 if (how == 1 && del_timer(&idev->regen_timer))
2480 /* clear tempaddr list */
2481 while ((ifa = idev->tempaddr_list) != NULL) {
2482 idev->tempaddr_list = ifa->tmp_next;
2483 ifa->tmp_next = NULL;
2485 write_unlock_bh(&idev->lock);
2486 spin_lock_bh(&ifa->lock);
2489 in6_ifa_put(ifa->ifpub);
2492 spin_unlock_bh(&ifa->lock);
2494 write_lock_bh(&idev->lock);
2497 while ((ifa = idev->addr_list) != NULL) {
2498 idev->addr_list = ifa->if_next;
2499 ifa->if_next = NULL;
2501 addrconf_del_timer(ifa);
2502 write_unlock_bh(&idev->lock);
2504 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2505 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2508 write_lock_bh(&idev->lock);
2510 write_unlock_bh(&idev->lock);
2512 /* Step 5: Discard multicast list */
2515 ipv6_mc_destroy_dev(idev);
2519 idev->tstamp = jiffies;
2521 /* Shot the device (if unregistered) */
2524 #ifdef CONFIG_SYSCTL
2525 addrconf_sysctl_unregister(&idev->cnf);
2526 neigh_sysctl_unregister(idev->nd_parms);
2528 neigh_parms_release(&nd_tbl, idev->nd_parms);
2529 neigh_ifdown(&nd_tbl, dev);
2535 static void addrconf_rs_timer(unsigned long data)
2537 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2539 if (ifp->idev->cnf.forwarding)
2542 if (ifp->idev->if_flags & IF_RA_RCVD) {
2544 * Announcement received after solicitation
2550 spin_lock(&ifp->lock);
2551 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2552 struct in6_addr all_routers;
2554 /* The wait after the last probe can be shorter */
2555 addrconf_mod_timer(ifp, AC_RS,
2556 (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2557 ifp->idev->cnf.rtr_solicit_delay :
2558 ifp->idev->cnf.rtr_solicit_interval);
2559 spin_unlock(&ifp->lock);
2561 ipv6_addr_all_routers(&all_routers);
2563 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2565 spin_unlock(&ifp->lock);
2567 * Note: we do not support deprecated "all on-link"
2568 * assumption any longer.
2570 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2571 ifp->idev->dev->name);
2579 * Duplicate Address Detection
2581 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2583 unsigned long rand_num;
2584 struct inet6_dev *idev = ifp->idev;
2586 if (ifp->flags & IFA_F_OPTIMISTIC)
2589 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2591 ifp->probes = idev->cnf.dad_transmits;
2592 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2595 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2597 struct inet6_dev *idev = ifp->idev;
2598 struct net_device *dev = idev->dev;
2600 addrconf_join_solict(dev, &ifp->addr);
2602 net_srandom(ifp->addr.s6_addr32[3]);
2604 read_lock_bh(&idev->lock);
2607 spin_lock_bh(&ifp->lock);
2609 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2610 !(ifp->flags&IFA_F_TENTATIVE) ||
2611 ifp->flags & IFA_F_NODAD) {
2612 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2613 spin_unlock_bh(&ifp->lock);
2614 read_unlock_bh(&idev->lock);
2616 addrconf_dad_completed(ifp);
2620 if (!(idev->if_flags & IF_READY)) {
2621 spin_unlock_bh(&ifp->lock);
2622 read_unlock_bh(&idev->lock);
2624 * If the defice is not ready:
2625 * - keep it tentative if it is a permanent address.
2626 * - otherwise, kill it.
2629 addrconf_dad_stop(ifp);
2634 * Optimistic nodes can start receiving
2637 if(ifp->flags & IFA_F_OPTIMISTIC)
2638 ip6_ins_rt(ifp->rt);
2640 addrconf_dad_kick(ifp);
2641 spin_unlock_bh(&ifp->lock);
2643 read_unlock_bh(&idev->lock);
2646 static void addrconf_dad_timer(unsigned long data)
2648 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2649 struct inet6_dev *idev = ifp->idev;
2650 struct in6_addr unspec;
2651 struct in6_addr mcaddr;
2653 read_lock_bh(&idev->lock);
2655 read_unlock_bh(&idev->lock);
2658 spin_lock_bh(&ifp->lock);
2659 if (ifp->probes == 0) {
2661 * DAD was successful
2664 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2665 spin_unlock_bh(&ifp->lock);
2666 read_unlock_bh(&idev->lock);
2668 addrconf_dad_completed(ifp);
2674 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2675 spin_unlock_bh(&ifp->lock);
2676 read_unlock_bh(&idev->lock);
2678 /* send a neighbour solicitation for our addr */
2679 memset(&unspec, 0, sizeof(unspec));
2680 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2681 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2686 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2688 struct net_device * dev = ifp->idev->dev;
2691 * Configure the address for reception. Now it is valid.
2694 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2696 /* If added prefix is link local and forwarding is off,
2697 start sending router solicitations.
2700 if (ifp->idev->cnf.forwarding == 0 &&
2701 ifp->idev->cnf.rtr_solicits > 0 &&
2702 (dev->flags&IFF_LOOPBACK) == 0 &&
2703 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2704 struct in6_addr all_routers;
2706 ipv6_addr_all_routers(&all_routers);
2709 * If a host as already performed a random delay
2710 * [...] as part of DAD [...] there is no need
2711 * to delay again before sending the first RS
2713 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2715 spin_lock_bh(&ifp->lock);
2717 ifp->idev->if_flags |= IF_RS_SENT;
2718 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2719 spin_unlock_bh(&ifp->lock);
2723 static void addrconf_dad_run(struct inet6_dev *idev) {
2724 struct inet6_ifaddr *ifp;
2726 read_lock_bh(&idev->lock);
2727 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2728 spin_lock_bh(&ifp->lock);
2729 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2730 spin_unlock_bh(&ifp->lock);
2733 spin_unlock_bh(&ifp->lock);
2734 addrconf_dad_kick(ifp);
2736 read_unlock_bh(&idev->lock);
2739 #ifdef CONFIG_PROC_FS
2740 struct if6_iter_state {
2744 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2746 struct inet6_ifaddr *ifa = NULL;
2747 struct if6_iter_state *state = seq->private;
2749 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2750 ifa = inet6_addr_lst[state->bucket];
2757 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2759 struct if6_iter_state *state = seq->private;
2761 ifa = ifa->lst_next;
2763 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2764 ifa = inet6_addr_lst[state->bucket];
2770 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2772 struct inet6_ifaddr *ifa = if6_get_first(seq);
2775 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2777 return pos ? NULL : ifa;
2780 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2782 read_lock_bh(&addrconf_hash_lock);
2783 return if6_get_idx(seq, *pos);
2786 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2788 struct inet6_ifaddr *ifa;
2790 ifa = if6_get_next(seq, v);
2795 static void if6_seq_stop(struct seq_file *seq, void *v)
2797 read_unlock_bh(&addrconf_hash_lock);
2800 static int if6_seq_show(struct seq_file *seq, void *v)
2802 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2804 NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
2806 ifp->idev->dev->ifindex,
2810 ifp->idev->dev->name);
2814 static const struct seq_operations if6_seq_ops = {
2815 .start = if6_seq_start,
2816 .next = if6_seq_next,
2817 .show = if6_seq_show,
2818 .stop = if6_seq_stop,
2821 static int if6_seq_open(struct inode *inode, struct file *file)
2823 return seq_open_private(file, &if6_seq_ops,
2824 sizeof(struct if6_iter_state));
2827 static const struct file_operations if6_fops = {
2828 .owner = THIS_MODULE,
2829 .open = if6_seq_open,
2831 .llseek = seq_lseek,
2832 .release = seq_release_private,
2835 int __init if6_proc_init(void)
2837 if (!proc_net_fops_create(&init_net, "if_inet6", S_IRUGO, &if6_fops))
2842 void if6_proc_exit(void)
2844 proc_net_remove(&init_net, "if_inet6");
2846 #endif /* CONFIG_PROC_FS */
2848 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
2849 /* Check if address is a home address configured on any interface. */
2850 int ipv6_chk_home_addr(struct in6_addr *addr)
2853 struct inet6_ifaddr * ifp;
2854 u8 hash = ipv6_addr_hash(addr);
2855 read_lock_bh(&addrconf_hash_lock);
2856 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
2857 if (ipv6_addr_cmp(&ifp->addr, addr) == 0 &&
2858 (ifp->flags & IFA_F_HOMEADDRESS)) {
2863 read_unlock_bh(&addrconf_hash_lock);
2869 * Periodic address status verification
2872 static void addrconf_verify(unsigned long foo)
2874 struct inet6_ifaddr *ifp;
2875 unsigned long now, next;
2878 spin_lock_bh(&addrconf_verify_lock);
2880 next = now + ADDR_CHECK_FREQUENCY;
2882 del_timer(&addr_chk_timer);
2884 for (i=0; i < IN6_ADDR_HSIZE; i++) {
2887 read_lock(&addrconf_hash_lock);
2888 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2890 #ifdef CONFIG_IPV6_PRIVACY
2891 unsigned long regen_advance;
2894 if (ifp->flags & IFA_F_PERMANENT)
2897 spin_lock(&ifp->lock);
2898 age = (now - ifp->tstamp) / HZ;
2900 #ifdef CONFIG_IPV6_PRIVACY
2901 regen_advance = ifp->idev->cnf.regen_max_retry *
2902 ifp->idev->cnf.dad_transmits *
2903 ifp->idev->nd_parms->retrans_time / HZ;
2906 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
2907 age >= ifp->valid_lft) {
2908 spin_unlock(&ifp->lock);
2910 read_unlock(&addrconf_hash_lock);
2913 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
2914 spin_unlock(&ifp->lock);
2916 } else if (age >= ifp->prefered_lft) {
2917 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2920 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2922 ifp->flags |= IFA_F_DEPRECATED;
2925 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2926 next = ifp->tstamp + ifp->valid_lft * HZ;
2928 spin_unlock(&ifp->lock);
2932 read_unlock(&addrconf_hash_lock);
2934 ipv6_ifa_notify(0, ifp);
2938 #ifdef CONFIG_IPV6_PRIVACY
2939 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2940 !(ifp->flags&IFA_F_TENTATIVE)) {
2941 if (age >= ifp->prefered_lft - regen_advance) {
2942 struct inet6_ifaddr *ifpub = ifp->ifpub;
2943 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2944 next = ifp->tstamp + ifp->prefered_lft * HZ;
2945 if (!ifp->regen_count && ifpub) {
2948 in6_ifa_hold(ifpub);
2949 spin_unlock(&ifp->lock);
2950 read_unlock(&addrconf_hash_lock);
2951 spin_lock(&ifpub->lock);
2952 ifpub->regen_count = 0;
2953 spin_unlock(&ifpub->lock);
2954 ipv6_create_tempaddr(ifpub, ifp);
2959 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
2960 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
2961 spin_unlock(&ifp->lock);
2964 /* ifp->prefered_lft <= ifp->valid_lft */
2965 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2966 next = ifp->tstamp + ifp->prefered_lft * HZ;
2967 spin_unlock(&ifp->lock);
2970 read_unlock(&addrconf_hash_lock);
2973 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
2974 add_timer(&addr_chk_timer);
2975 spin_unlock_bh(&addrconf_verify_lock);
2978 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
2980 struct in6_addr *pfx = NULL;
2983 pfx = nla_data(addr);
2986 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
2989 pfx = nla_data(local);
2995 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
2996 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
2997 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
2998 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3002 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3004 struct ifaddrmsg *ifm;
3005 struct nlattr *tb[IFA_MAX+1];
3006 struct in6_addr *pfx;
3009 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3013 ifm = nlmsg_data(nlh);
3014 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3018 return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3021 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3022 u32 prefered_lft, u32 valid_lft)
3024 u32 flags = RTF_EXPIRES;
3026 if (!valid_lft || (prefered_lft > valid_lft))
3029 if (valid_lft == INFINITY_LIFE_TIME) {
3030 ifa_flags |= IFA_F_PERMANENT;
3032 } else if (valid_lft >= 0x7FFFFFFF/HZ)
3033 valid_lft = 0x7FFFFFFF/HZ;
3035 if (prefered_lft == 0)
3036 ifa_flags |= IFA_F_DEPRECATED;
3037 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
3038 (prefered_lft != INFINITY_LIFE_TIME))
3039 prefered_lft = 0x7FFFFFFF/HZ;
3041 spin_lock_bh(&ifp->lock);
3042 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3043 ifp->tstamp = jiffies;
3044 ifp->valid_lft = valid_lft;
3045 ifp->prefered_lft = prefered_lft;
3047 spin_unlock_bh(&ifp->lock);
3048 if (!(ifp->flags&IFA_F_TENTATIVE))
3049 ipv6_ifa_notify(0, ifp);
3051 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3052 jiffies_to_clock_t(valid_lft * HZ), flags);
3059 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3061 struct ifaddrmsg *ifm;
3062 struct nlattr *tb[IFA_MAX+1];
3063 struct in6_addr *pfx;
3064 struct inet6_ifaddr *ifa;
3065 struct net_device *dev;
3066 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3070 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3074 ifm = nlmsg_data(nlh);
3075 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3079 if (tb[IFA_CACHEINFO]) {
3080 struct ifa_cacheinfo *ci;
3082 ci = nla_data(tb[IFA_CACHEINFO]);
3083 valid_lft = ci->ifa_valid;
3084 preferred_lft = ci->ifa_prefered;
3086 preferred_lft = INFINITY_LIFE_TIME;
3087 valid_lft = INFINITY_LIFE_TIME;
3090 dev = __dev_get_by_index(&init_net, ifm->ifa_index);
3094 /* We ignore other flags so far. */
3095 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3097 ifa = ipv6_get_ifaddr(pfx, dev, 1);
3100 * It would be best to check for !NLM_F_CREATE here but
3101 * userspace alreay relies on not having to provide this.
3103 return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen,
3104 ifa_flags, preferred_lft, valid_lft);
3107 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3108 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3111 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3118 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3119 u8 scope, int ifindex)
3121 struct ifaddrmsg *ifm;
3123 ifm = nlmsg_data(nlh);
3124 ifm->ifa_family = AF_INET6;
3125 ifm->ifa_prefixlen = prefixlen;
3126 ifm->ifa_flags = flags;
3127 ifm->ifa_scope = scope;
3128 ifm->ifa_index = ifindex;
3131 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3132 unsigned long tstamp, u32 preferred, u32 valid)
3134 struct ifa_cacheinfo ci;
3136 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3137 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3138 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3139 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3140 ci.ifa_prefered = preferred;
3141 ci.ifa_valid = valid;
3143 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3146 static inline int rt_scope(int ifa_scope)
3148 if (ifa_scope & IFA_HOST)
3149 return RT_SCOPE_HOST;
3150 else if (ifa_scope & IFA_LINK)
3151 return RT_SCOPE_LINK;
3152 else if (ifa_scope & IFA_SITE)
3153 return RT_SCOPE_SITE;
3155 return RT_SCOPE_UNIVERSE;
3158 static inline int inet6_ifaddr_msgsize(void)
3160 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3161 + nla_total_size(16) /* IFA_ADDRESS */
3162 + nla_total_size(sizeof(struct ifa_cacheinfo));
3165 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3166 u32 pid, u32 seq, int event, unsigned int flags)
3168 struct nlmsghdr *nlh;
3169 u32 preferred, valid;
3171 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3175 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3176 ifa->idev->dev->ifindex);
3178 if (!(ifa->flags&IFA_F_PERMANENT)) {
3179 preferred = ifa->prefered_lft;
3180 valid = ifa->valid_lft;
3181 if (preferred != INFINITY_LIFE_TIME) {
3182 long tval = (jiffies - ifa->tstamp)/HZ;
3184 if (valid != INFINITY_LIFE_TIME)
3188 preferred = INFINITY_LIFE_TIME;
3189 valid = INFINITY_LIFE_TIME;
3192 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3193 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3194 nlmsg_cancel(skb, nlh);
3198 return nlmsg_end(skb, nlh);
3201 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3202 u32 pid, u32 seq, int event, u16 flags)
3204 struct nlmsghdr *nlh;
3205 u8 scope = RT_SCOPE_UNIVERSE;
3206 int ifindex = ifmca->idev->dev->ifindex;
3208 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3209 scope = RT_SCOPE_SITE;
3211 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3215 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3216 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3217 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3218 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3219 nlmsg_cancel(skb, nlh);
3223 return nlmsg_end(skb, nlh);
3226 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3227 u32 pid, u32 seq, int event, unsigned int flags)
3229 struct nlmsghdr *nlh;
3230 u8 scope = RT_SCOPE_UNIVERSE;
3231 int ifindex = ifaca->aca_idev->dev->ifindex;
3233 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3234 scope = RT_SCOPE_SITE;
3236 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3240 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3241 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3242 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3243 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3244 nlmsg_cancel(skb, nlh);
3248 return nlmsg_end(skb, nlh);
3258 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3259 enum addr_type_t type)
3262 int s_idx, s_ip_idx;
3264 struct net_device *dev;
3265 struct inet6_dev *idev = NULL;
3266 struct inet6_ifaddr *ifa;
3267 struct ifmcaddr6 *ifmca;
3268 struct ifacaddr6 *ifaca;
3270 s_idx = cb->args[0];
3271 s_ip_idx = ip_idx = cb->args[1];
3274 for_each_netdev(&init_net, dev) {
3280 if ((idev = in6_dev_get(dev)) == NULL)
3282 read_lock_bh(&idev->lock);
3285 /* unicast address incl. temp addr */
3286 for (ifa = idev->addr_list; ifa;
3287 ifa = ifa->if_next, ip_idx++) {
3288 if (ip_idx < s_ip_idx)
3290 if ((err = inet6_fill_ifaddr(skb, ifa,
3291 NETLINK_CB(cb->skb).pid,
3292 cb->nlh->nlmsg_seq, RTM_NEWADDR,
3297 case MULTICAST_ADDR:
3298 /* multicast address */
3299 for (ifmca = idev->mc_list; ifmca;
3300 ifmca = ifmca->next, ip_idx++) {
3301 if (ip_idx < s_ip_idx)
3303 if ((err = inet6_fill_ifmcaddr(skb, ifmca,
3304 NETLINK_CB(cb->skb).pid,
3305 cb->nlh->nlmsg_seq, RTM_GETMULTICAST,
3311 /* anycast address */
3312 for (ifaca = idev->ac_list; ifaca;
3313 ifaca = ifaca->aca_next, ip_idx++) {
3314 if (ip_idx < s_ip_idx)
3316 if ((err = inet6_fill_ifacaddr(skb, ifaca,
3317 NETLINK_CB(cb->skb).pid,
3318 cb->nlh->nlmsg_seq, RTM_GETANYCAST,
3326 read_unlock_bh(&idev->lock);
3333 read_unlock_bh(&idev->lock);
3337 cb->args[1] = ip_idx;
3341 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3343 enum addr_type_t type = UNICAST_ADDR;
3344 return inet6_dump_addr(skb, cb, type);
3347 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3349 enum addr_type_t type = MULTICAST_ADDR;
3350 return inet6_dump_addr(skb, cb, type);
3354 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3356 enum addr_type_t type = ANYCAST_ADDR;
3357 return inet6_dump_addr(skb, cb, type);
3360 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3363 struct ifaddrmsg *ifm;
3364 struct nlattr *tb[IFA_MAX+1];
3365 struct in6_addr *addr = NULL;
3366 struct net_device *dev = NULL;
3367 struct inet6_ifaddr *ifa;
3368 struct sk_buff *skb;
3371 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3375 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3381 ifm = nlmsg_data(nlh);
3383 dev = __dev_get_by_index(&init_net, ifm->ifa_index);
3385 if ((ifa = ipv6_get_ifaddr(addr, dev, 1)) == NULL) {
3386 err = -EADDRNOTAVAIL;
3390 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
3395 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3396 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3398 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3399 WARN_ON(err == -EMSGSIZE);
3403 err = rtnl_unicast(skb, NETLINK_CB(in_skb).pid);
3410 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3412 struct sk_buff *skb;
3415 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3419 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3421 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3422 WARN_ON(err == -EMSGSIZE);
3426 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3429 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err);
3432 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3433 __s32 *array, int bytes)
3435 BUG_ON(bytes < (DEVCONF_MAX * 4));
3437 memset(array, 0, bytes);
3438 array[DEVCONF_FORWARDING] = cnf->forwarding;
3439 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3440 array[DEVCONF_MTU6] = cnf->mtu6;
3441 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3442 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3443 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3444 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3445 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3446 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3447 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3448 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3449 #ifdef CONFIG_IPV6_PRIVACY
3450 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3451 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3452 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3453 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3454 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3456 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3457 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3458 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3459 #ifdef CONFIG_IPV6_ROUTER_PREF
3460 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3461 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3462 #ifdef CONFIG_IPV6_ROUTE_INFO
3463 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3466 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3467 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3468 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3469 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3473 static inline size_t inet6_if_nlmsg_size(void)
3475 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3476 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3477 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3478 + nla_total_size(4) /* IFLA_MTU */
3479 + nla_total_size(4) /* IFLA_LINK */
3480 + nla_total_size( /* IFLA_PROTINFO */
3481 nla_total_size(4) /* IFLA_INET6_FLAGS */
3482 + nla_total_size(sizeof(struct ifla_cacheinfo))
3483 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3484 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3485 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
3489 static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
3493 int pad = bytes - sizeof(u64) * items;
3496 /* Use put_unaligned() because stats may not be aligned for u64. */
3497 put_unaligned(items, &stats[0]);
3498 for (i = 1; i < items; i++)
3499 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3501 memset(&stats[items], 0, pad);
3504 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3508 case IFLA_INET6_STATS:
3509 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3511 case IFLA_INET6_ICMP6STATS:
3512 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3517 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3518 u32 pid, u32 seq, int event, unsigned int flags)
3520 struct net_device *dev = idev->dev;
3522 struct ifinfomsg *hdr;
3523 struct nlmsghdr *nlh;
3525 struct ifla_cacheinfo ci;
3527 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3531 hdr = nlmsg_data(nlh);
3532 hdr->ifi_family = AF_INET6;
3534 hdr->ifi_type = dev->type;
3535 hdr->ifi_index = dev->ifindex;
3536 hdr->ifi_flags = dev_get_flags(dev);
3537 hdr->ifi_change = 0;
3539 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3542 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3544 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3545 if (dev->ifindex != dev->iflink)
3546 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3548 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3549 if (protoinfo == NULL)
3550 goto nla_put_failure;
3552 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3554 ci.max_reasm_len = IPV6_MAXPLEN;
3555 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3556 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3557 ci.reachable_time = idev->nd_parms->reachable_time;
3558 ci.retrans_time = idev->nd_parms->retrans_time;
3559 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3561 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3563 goto nla_put_failure;
3564 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3566 /* XXX - MC not implemented */
3568 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3570 goto nla_put_failure;
3571 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3573 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3575 goto nla_put_failure;
3576 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3578 nla_nest_end(skb, protoinfo);
3579 return nlmsg_end(skb, nlh);
3582 nlmsg_cancel(skb, nlh);
3586 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3589 int s_idx = cb->args[0];
3590 struct net_device *dev;
3591 struct inet6_dev *idev;
3593 read_lock(&dev_base_lock);
3595 for_each_netdev(&init_net, dev) {
3598 if ((idev = in6_dev_get(dev)) == NULL)
3600 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3601 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3608 read_unlock(&dev_base_lock);
3614 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3616 struct sk_buff *skb;
3619 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
3623 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
3625 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3626 WARN_ON(err == -EMSGSIZE);
3630 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3633 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err);
3636 static inline size_t inet6_prefix_nlmsg_size(void)
3638 return NLMSG_ALIGN(sizeof(struct prefixmsg))
3639 + nla_total_size(sizeof(struct in6_addr))
3640 + nla_total_size(sizeof(struct prefix_cacheinfo));
3643 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3644 struct prefix_info *pinfo, u32 pid, u32 seq,
3645 int event, unsigned int flags)
3647 struct prefixmsg *pmsg;
3648 struct nlmsghdr *nlh;
3649 struct prefix_cacheinfo ci;
3651 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3655 pmsg = nlmsg_data(nlh);
3656 pmsg->prefix_family = AF_INET6;
3657 pmsg->prefix_pad1 = 0;
3658 pmsg->prefix_pad2 = 0;
3659 pmsg->prefix_ifindex = idev->dev->ifindex;
3660 pmsg->prefix_len = pinfo->prefix_len;
3661 pmsg->prefix_type = pinfo->type;
3662 pmsg->prefix_pad3 = 0;
3663 pmsg->prefix_flags = 0;
3665 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3666 if (pinfo->autoconf)
3667 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3669 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3671 ci.preferred_time = ntohl(pinfo->prefered);
3672 ci.valid_time = ntohl(pinfo->valid);
3673 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3675 return nlmsg_end(skb, nlh);
3678 nlmsg_cancel(skb, nlh);
3682 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3683 struct prefix_info *pinfo)
3685 struct sk_buff *skb;
3688 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
3692 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
3694 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3695 WARN_ON(err == -EMSGSIZE);
3699 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3702 rtnl_set_sk_err(RTNLGRP_IPV6_PREFIX, err);
3705 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3707 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3712 * If the address was optimistic
3713 * we inserted the route at the start of
3714 * our DAD process, so we don't need
3717 if (!(ifp->rt->rt6i_node))
3718 ip6_ins_rt(ifp->rt);
3719 if (ifp->idev->cnf.forwarding)
3720 addrconf_join_anycast(ifp);
3723 if (ifp->idev->cnf.forwarding)
3724 addrconf_leave_anycast(ifp);
3725 addrconf_leave_solict(ifp->idev, &ifp->addr);
3726 dst_hold(&ifp->rt->u.dst);
3727 if (ip6_del_rt(ifp->rt))
3728 dst_free(&ifp->rt->u.dst);
3733 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3736 if (likely(ifp->idev->dead == 0))
3737 __ipv6_ifa_notify(event, ifp);
3738 rcu_read_unlock_bh();
3741 #ifdef CONFIG_SYSCTL
3744 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3745 void __user *buffer, size_t *lenp, loff_t *ppos)
3747 int *valp = ctl->data;
3751 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3753 if (write && valp != &ipv6_devconf_dflt.forwarding) {
3754 if (valp != &ipv6_devconf.forwarding) {
3755 if ((!*valp) ^ (!val)) {
3756 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
3759 dev_forward_change(idev);
3762 ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding;
3763 addrconf_forward_change();
3766 rt6_purge_dflt_routers();
3772 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3773 int __user *name, int nlen,
3774 void __user *oldval,
3775 size_t __user *oldlenp,
3776 void __user *newval, size_t newlen)
3778 int *valp = table->data;
3781 if (!newval || !newlen)
3783 if (newlen != sizeof(int))
3785 if (get_user(new, (int __user *)newval))
3789 if (oldval && oldlenp) {
3791 if (get_user(len, oldlenp))
3794 if (len > table->maxlen)
3795 len = table->maxlen;
3796 if (copy_to_user(oldval, valp, len))
3798 if (put_user(len, oldlenp))
3803 if (valp != &ipv6_devconf_dflt.forwarding) {
3804 if (valp != &ipv6_devconf.forwarding) {
3805 struct inet6_dev *idev = (struct inet6_dev *)table->extra1;
3807 if (unlikely(idev == NULL))
3809 changed = (!*valp) ^ (!new);
3812 dev_forward_change(idev);
3815 addrconf_forward_change();
3819 rt6_purge_dflt_routers();
3826 static struct addrconf_sysctl_table
3828 struct ctl_table_header *sysctl_header;
3829 ctl_table addrconf_vars[__NET_IPV6_MAX];
3830 ctl_table addrconf_dev[2];
3831 ctl_table addrconf_conf_dir[2];
3832 ctl_table addrconf_proto_dir[2];
3833 ctl_table addrconf_root_dir[2];
3834 } addrconf_sysctl __read_mostly = {
3835 .sysctl_header = NULL,
3838 .ctl_name = NET_IPV6_FORWARDING,
3839 .procname = "forwarding",
3840 .data = &ipv6_devconf.forwarding,
3841 .maxlen = sizeof(int),
3843 .proc_handler = &addrconf_sysctl_forward,
3844 .strategy = &addrconf_sysctl_forward_strategy,
3847 .ctl_name = NET_IPV6_HOP_LIMIT,
3848 .procname = "hop_limit",
3849 .data = &ipv6_devconf.hop_limit,
3850 .maxlen = sizeof(int),
3852 .proc_handler = proc_dointvec,
3855 .ctl_name = NET_IPV6_MTU,
3857 .data = &ipv6_devconf.mtu6,
3858 .maxlen = sizeof(int),
3860 .proc_handler = &proc_dointvec,
3863 .ctl_name = NET_IPV6_ACCEPT_RA,
3864 .procname = "accept_ra",
3865 .data = &ipv6_devconf.accept_ra,
3866 .maxlen = sizeof(int),
3868 .proc_handler = &proc_dointvec,
3871 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS,
3872 .procname = "accept_redirects",
3873 .data = &ipv6_devconf.accept_redirects,
3874 .maxlen = sizeof(int),
3876 .proc_handler = &proc_dointvec,
3879 .ctl_name = NET_IPV6_AUTOCONF,
3880 .procname = "autoconf",
3881 .data = &ipv6_devconf.autoconf,
3882 .maxlen = sizeof(int),
3884 .proc_handler = &proc_dointvec,
3887 .ctl_name = NET_IPV6_DAD_TRANSMITS,
3888 .procname = "dad_transmits",
3889 .data = &ipv6_devconf.dad_transmits,
3890 .maxlen = sizeof(int),
3892 .proc_handler = &proc_dointvec,
3895 .ctl_name = NET_IPV6_RTR_SOLICITS,
3896 .procname = "router_solicitations",
3897 .data = &ipv6_devconf.rtr_solicits,
3898 .maxlen = sizeof(int),
3900 .proc_handler = &proc_dointvec,
3903 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL,
3904 .procname = "router_solicitation_interval",
3905 .data = &ipv6_devconf.rtr_solicit_interval,
3906 .maxlen = sizeof(int),
3908 .proc_handler = &proc_dointvec_jiffies,
3909 .strategy = &sysctl_jiffies,
3912 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY,
3913 .procname = "router_solicitation_delay",
3914 .data = &ipv6_devconf.rtr_solicit_delay,
3915 .maxlen = sizeof(int),
3917 .proc_handler = &proc_dointvec_jiffies,
3918 .strategy = &sysctl_jiffies,
3921 .ctl_name = NET_IPV6_FORCE_MLD_VERSION,
3922 .procname = "force_mld_version",
3923 .data = &ipv6_devconf.force_mld_version,
3924 .maxlen = sizeof(int),
3926 .proc_handler = &proc_dointvec,
3928 #ifdef CONFIG_IPV6_PRIVACY
3930 .ctl_name = NET_IPV6_USE_TEMPADDR,
3931 .procname = "use_tempaddr",
3932 .data = &ipv6_devconf.use_tempaddr,
3933 .maxlen = sizeof(int),
3935 .proc_handler = &proc_dointvec,
3938 .ctl_name = NET_IPV6_TEMP_VALID_LFT,
3939 .procname = "temp_valid_lft",
3940 .data = &ipv6_devconf.temp_valid_lft,
3941 .maxlen = sizeof(int),
3943 .proc_handler = &proc_dointvec,
3946 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT,
3947 .procname = "temp_prefered_lft",
3948 .data = &ipv6_devconf.temp_prefered_lft,
3949 .maxlen = sizeof(int),
3951 .proc_handler = &proc_dointvec,
3954 .ctl_name = NET_IPV6_REGEN_MAX_RETRY,
3955 .procname = "regen_max_retry",
3956 .data = &ipv6_devconf.regen_max_retry,
3957 .maxlen = sizeof(int),
3959 .proc_handler = &proc_dointvec,
3962 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR,
3963 .procname = "max_desync_factor",
3964 .data = &ipv6_devconf.max_desync_factor,
3965 .maxlen = sizeof(int),
3967 .proc_handler = &proc_dointvec,
3971 .ctl_name = NET_IPV6_MAX_ADDRESSES,
3972 .procname = "max_addresses",
3973 .data = &ipv6_devconf.max_addresses,
3974 .maxlen = sizeof(int),
3976 .proc_handler = &proc_dointvec,
3979 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR,
3980 .procname = "accept_ra_defrtr",
3981 .data = &ipv6_devconf.accept_ra_defrtr,
3982 .maxlen = sizeof(int),
3984 .proc_handler = &proc_dointvec,
3987 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO,
3988 .procname = "accept_ra_pinfo",
3989 .data = &ipv6_devconf.accept_ra_pinfo,
3990 .maxlen = sizeof(int),
3992 .proc_handler = &proc_dointvec,
3994 #ifdef CONFIG_IPV6_ROUTER_PREF
3996 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF,
3997 .procname = "accept_ra_rtr_pref",
3998 .data = &ipv6_devconf.accept_ra_rtr_pref,
3999 .maxlen = sizeof(int),
4001 .proc_handler = &proc_dointvec,
4004 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL,
4005 .procname = "router_probe_interval",
4006 .data = &ipv6_devconf.rtr_probe_interval,
4007 .maxlen = sizeof(int),
4009 .proc_handler = &proc_dointvec_jiffies,
4010 .strategy = &sysctl_jiffies,
4012 #ifdef CONFIG_IPV6_ROUTE_INFO
4014 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
4015 .procname = "accept_ra_rt_info_max_plen",
4016 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4017 .maxlen = sizeof(int),
4019 .proc_handler = &proc_dointvec,
4024 .ctl_name = NET_IPV6_PROXY_NDP,
4025 .procname = "proxy_ndp",
4026 .data = &ipv6_devconf.proxy_ndp,
4027 .maxlen = sizeof(int),
4029 .proc_handler = &proc_dointvec,
4032 .ctl_name = NET_IPV6_ACCEPT_SOURCE_ROUTE,
4033 .procname = "accept_source_route",
4034 .data = &ipv6_devconf.accept_source_route,
4035 .maxlen = sizeof(int),
4037 .proc_handler = &proc_dointvec,
4039 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4041 .ctl_name = CTL_UNNUMBERED,
4042 .procname = "optimistic_dad",
4043 .data = &ipv6_devconf.optimistic_dad,
4044 .maxlen = sizeof(int),
4046 .proc_handler = &proc_dointvec,
4051 .ctl_name = 0, /* sentinel */
4056 .ctl_name = NET_PROTO_CONF_ALL,
4059 .child = addrconf_sysctl.addrconf_vars,
4062 .ctl_name = 0, /* sentinel */
4065 .addrconf_conf_dir = {
4067 .ctl_name = NET_IPV6_CONF,
4070 .child = addrconf_sysctl.addrconf_dev,
4073 .ctl_name = 0, /* sentinel */
4076 .addrconf_proto_dir = {
4078 .ctl_name = NET_IPV6,
4081 .child = addrconf_sysctl.addrconf_conf_dir,
4084 .ctl_name = 0, /* sentinel */
4087 .addrconf_root_dir = {
4089 .ctl_name = CTL_NET,
4092 .child = addrconf_sysctl.addrconf_proto_dir,
4095 .ctl_name = 0, /* sentinel */
4100 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p)
4103 struct net_device *dev = idev ? idev->dev : NULL;
4104 struct addrconf_sysctl_table *t;
4105 char *dev_name = NULL;
4107 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4110 for (i=0; t->addrconf_vars[i].data; i++) {
4111 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
4112 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4115 dev_name = dev->name;
4116 t->addrconf_dev[0].ctl_name = dev->ifindex;
4118 dev_name = "default";
4119 t->addrconf_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT;
4123 * Make a copy of dev_name, because '.procname' is regarded as const
4124 * by sysctl and we wouldn't want anyone to change it under our feet
4125 * (see SIOCSIFNAME).
4127 dev_name = kstrdup(dev_name, GFP_KERNEL);
4131 t->addrconf_dev[0].procname = dev_name;
4133 t->addrconf_dev[0].child = t->addrconf_vars;
4134 t->addrconf_conf_dir[0].child = t->addrconf_dev;
4135 t->addrconf_proto_dir[0].child = t->addrconf_conf_dir;
4136 t->addrconf_root_dir[0].child = t->addrconf_proto_dir;
4138 t->sysctl_header = register_sysctl_table(t->addrconf_root_dir);
4139 if (t->sysctl_header == NULL)
4154 static void addrconf_sysctl_unregister(struct ipv6_devconf *p)
4157 struct addrconf_sysctl_table *t = p->sysctl;
4159 unregister_sysctl_table(t->sysctl_header);
4160 kfree(t->addrconf_dev[0].procname);
4172 int register_inet6addr_notifier(struct notifier_block *nb)
4174 return atomic_notifier_chain_register(&inet6addr_chain, nb);
4177 EXPORT_SYMBOL(register_inet6addr_notifier);
4179 int unregister_inet6addr_notifier(struct notifier_block *nb)
4181 return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
4184 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4187 * Init / cleanup code
4190 int __init addrconf_init(void)
4194 /* The addrconf netdev notifier requires that loopback_dev
4195 * has it's ipv6 private information allocated and setup
4196 * before it can bring up and give link-local addresses
4197 * to other devices which are up.
4199 * Unfortunately, loopback_dev is not necessarily the first
4200 * entry in the global dev_base list of net devices. In fact,
4201 * it is likely to be the very last entry on that list.
4202 * So this causes the notifier registry below to try and
4203 * give link-local addresses to all devices besides loopback_dev
4204 * first, then loopback_dev, which cases all the non-loopback_dev
4205 * devices to fail to get a link-local address.
4207 * So, as a temporary fix, allocate the ipv6 structure for
4208 * loopback_dev first by hand.
4209 * Longer term, all of the dependencies ipv6 has upon the loopback
4210 * device and it being up should be removed.
4213 if (!ipv6_add_dev(init_net.loopback_dev))
4219 ip6_null_entry.u.dst.dev = init_net.loopback_dev;
4220 ip6_null_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
4221 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
4222 ip6_prohibit_entry.u.dst.dev = init_net.loopback_dev;
4223 ip6_prohibit_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
4224 ip6_blk_hole_entry.u.dst.dev = init_net.loopback_dev;
4225 ip6_blk_hole_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
4228 register_netdevice_notifier(&ipv6_dev_notf);
4232 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4236 /* Only the first call to __rtnl_register can fail */
4237 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4238 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4239 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4240 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4241 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4243 #ifdef CONFIG_SYSCTL
4244 addrconf_sysctl.sysctl_header =
4245 register_sysctl_table(addrconf_sysctl.addrconf_root_dir);
4246 addrconf_sysctl_register(NULL, &ipv6_devconf_dflt);
4251 unregister_netdevice_notifier(&ipv6_dev_notf);
4256 void __exit addrconf_cleanup(void)
4258 struct net_device *dev;
4259 struct inet6_ifaddr *ifa;
4262 unregister_netdevice_notifier(&ipv6_dev_notf);
4264 #ifdef CONFIG_SYSCTL
4265 addrconf_sysctl_unregister(&ipv6_devconf_dflt);
4266 addrconf_sysctl_unregister(&ipv6_devconf);
4275 for_each_netdev(&init_net, dev) {
4276 if (__in6_dev_get(dev) == NULL)
4278 addrconf_ifdown(dev, 1);
4280 addrconf_ifdown(init_net.loopback_dev, 2);
4286 write_lock_bh(&addrconf_hash_lock);
4287 for (i=0; i < IN6_ADDR_HSIZE; i++) {
4288 for (ifa=inet6_addr_lst[i]; ifa; ) {
4289 struct inet6_ifaddr *bifa;
4292 ifa = ifa->lst_next;
4293 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4294 /* Do not free it; something is wrong.
4295 Now we can investigate it with debugger.
4299 write_unlock_bh(&addrconf_hash_lock);
4301 del_timer(&addr_chk_timer);