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 int ipv6_dev_get_saddr(struct net_device *daddr_dev,
878 struct in6_addr *daddr, struct in6_addr *saddr)
880 struct ipv6_saddr_score hiscore;
881 struct inet6_ifaddr *ifa_result = NULL;
882 int daddr_type = __ipv6_addr_type(daddr);
883 int daddr_scope = __ipv6_addr_src_scope(daddr_type);
884 int daddr_ifindex = daddr_dev ? daddr_dev->ifindex : 0;
885 u32 daddr_label = ipv6_addr_label(daddr, daddr_type, daddr_ifindex);
886 struct net_device *dev;
888 memset(&hiscore, 0, sizeof(hiscore));
890 read_lock(&dev_base_lock);
893 for_each_netdev(&init_net, dev) {
894 struct inet6_dev *idev;
895 struct inet6_ifaddr *ifa;
897 /* Rule 0: Candidate Source Address (section 4)
898 * - multicast and link-local destination address,
899 * the set of candidate source address MUST only
900 * include addresses assigned to interfaces
901 * belonging to the same link as the outgoing
903 * (- For site-local destination addresses, the
904 * set of candidate source addresses MUST only
905 * include addresses assigned to interfaces
906 * belonging to the same site as the outgoing
909 if ((daddr_type & IPV6_ADDR_MULTICAST ||
910 daddr_scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
911 daddr_dev && dev != daddr_dev)
914 idev = __in6_dev_get(dev);
918 read_lock_bh(&idev->lock);
919 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
920 struct ipv6_saddr_score score;
922 score.addr_type = __ipv6_addr_type(&ifa->addr);
925 * - Tentative Address (RFC2462 section 5.4)
926 * - A tentative address is not considered
927 * "assigned to an interface" in the traditional
928 * sense, unless it is also flagged as optimistic.
929 * - Candidate Source Address (section 4)
930 * - In any case, anycast addresses, multicast
931 * addresses, and the unspecified address MUST
932 * NOT be included in a candidate set.
934 if ((ifa->flags & IFA_F_TENTATIVE) &&
935 (!(ifa->flags & IFA_F_OPTIMISTIC)))
937 if (unlikely(score.addr_type == IPV6_ADDR_ANY ||
938 score.addr_type & IPV6_ADDR_MULTICAST)) {
939 LIMIT_NETDEBUG(KERN_DEBUG
940 "ADDRCONF: unspecified / multicast address "
941 "assigned as unicast address on %s",
951 if (ifa_result == NULL) {
952 /* record it if the first available entry */
956 /* Rule 1: Prefer same address */
957 if (hiscore.rule < 1) {
958 if (ipv6_addr_equal(&ifa_result->addr, daddr))
959 hiscore.attrs |= IPV6_SADDR_SCORE_LOCAL;
962 if (ipv6_addr_equal(&ifa->addr, daddr)) {
963 score.attrs |= IPV6_SADDR_SCORE_LOCAL;
964 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)) {
969 if (hiscore.attrs & IPV6_SADDR_SCORE_LOCAL)
973 /* Rule 2: Prefer appropriate scope */
974 if (hiscore.rule < 2) {
975 hiscore.scope = __ipv6_addr_src_scope(hiscore.addr_type);
978 score.scope = __ipv6_addr_src_scope(score.addr_type);
979 if (hiscore.scope < score.scope) {
980 if (hiscore.scope < daddr_scope) {
985 } else if (score.scope < hiscore.scope) {
986 if (score.scope < daddr_scope)
987 break; /* addresses sorted by scope */
994 /* Rule 3: Avoid deprecated and optimistic addresses */
995 if (hiscore.rule < 3) {
996 if (ipv6_saddr_preferred(hiscore.addr_type) ||
997 (((ifa_result->flags &
998 (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0)))
999 hiscore.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1002 if (ipv6_saddr_preferred(score.addr_type) ||
1004 (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)) == 0))) {
1005 score.attrs |= IPV6_SADDR_SCORE_PREFERRED;
1006 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)) {
1011 if (hiscore.attrs & IPV6_SADDR_SCORE_PREFERRED)
1015 /* Rule 4: Prefer home address */
1016 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
1017 if (hiscore.rule < 4) {
1018 if (ifa_result->flags & IFA_F_HOMEADDRESS)
1019 hiscore.attrs |= IPV6_SADDR_SCORE_HOA;
1022 if (ifa->flags & IFA_F_HOMEADDRESS) {
1023 score.attrs |= IPV6_SADDR_SCORE_HOA;
1024 if (!(ifa_result->flags & IFA_F_HOMEADDRESS)) {
1029 if (hiscore.attrs & IPV6_SADDR_SCORE_HOA)
1033 if (hiscore.rule < 4)
1037 /* Rule 5: Prefer outgoing interface */
1038 if (hiscore.rule < 5) {
1039 if (daddr_dev == NULL ||
1040 daddr_dev == ifa_result->idev->dev)
1041 hiscore.attrs |= IPV6_SADDR_SCORE_OIF;
1044 if (daddr_dev == NULL ||
1045 daddr_dev == ifa->idev->dev) {
1046 score.attrs |= IPV6_SADDR_SCORE_OIF;
1047 if (!(hiscore.attrs & IPV6_SADDR_SCORE_OIF)) {
1052 if (hiscore.attrs & IPV6_SADDR_SCORE_OIF)
1056 /* Rule 6: Prefer matching label */
1057 if (hiscore.rule < 6) {
1058 if (ipv6_addr_label(&ifa_result->addr,
1060 ifa_result->idev->dev->ifindex) == daddr_label)
1061 hiscore.attrs |= IPV6_SADDR_SCORE_LABEL;
1064 if (ipv6_addr_label(&ifa->addr,
1066 ifa->idev->dev->ifindex) == daddr_label) {
1067 score.attrs |= IPV6_SADDR_SCORE_LABEL;
1068 if (!(hiscore.attrs & IPV6_SADDR_SCORE_LABEL)) {
1073 if (hiscore.attrs & IPV6_SADDR_SCORE_LABEL)
1077 #ifdef CONFIG_IPV6_PRIVACY
1078 /* Rule 7: Prefer public address
1079 * Note: prefer temprary address if use_tempaddr >= 2
1081 if (hiscore.rule < 7) {
1082 if ((!(ifa_result->flags & IFA_F_TEMPORARY)) ^
1083 (ifa_result->idev->cnf.use_tempaddr >= 2))
1084 hiscore.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1087 if ((!(ifa->flags & IFA_F_TEMPORARY)) ^
1088 (ifa->idev->cnf.use_tempaddr >= 2)) {
1089 score.attrs |= IPV6_SADDR_SCORE_PRIVACY;
1090 if (!(hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)) {
1095 if (hiscore.attrs & IPV6_SADDR_SCORE_PRIVACY)
1099 if (hiscore.rule < 7)
1102 /* Rule 8: Use longest matching prefix */
1103 if (hiscore.rule < 8) {
1104 hiscore.matchlen = ipv6_addr_diff(&ifa_result->addr, daddr);
1107 score.matchlen = ipv6_addr_diff(&ifa->addr, daddr);
1108 if (score.matchlen > hiscore.matchlen) {
1113 else if (score.matchlen < hiscore.matchlen)
1117 /* Final Rule: choose first available one */
1121 in6_ifa_put(ifa_result);
1126 read_unlock_bh(&idev->lock);
1129 read_unlock(&dev_base_lock);
1132 return -EADDRNOTAVAIL;
1134 ipv6_addr_copy(saddr, &ifa_result->addr);
1135 in6_ifa_put(ifa_result);
1140 int ipv6_get_saddr(struct dst_entry *dst,
1141 struct in6_addr *daddr, struct in6_addr *saddr)
1143 return ipv6_dev_get_saddr(dst ? ip6_dst_idev(dst)->dev : NULL, daddr, saddr);
1146 EXPORT_SYMBOL(ipv6_get_saddr);
1148 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1149 unsigned char banned_flags)
1151 struct inet6_dev *idev;
1152 int err = -EADDRNOTAVAIL;
1155 if ((idev = __in6_dev_get(dev)) != NULL) {
1156 struct inet6_ifaddr *ifp;
1158 read_lock_bh(&idev->lock);
1159 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1160 if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1161 ipv6_addr_copy(addr, &ifp->addr);
1166 read_unlock_bh(&idev->lock);
1172 static int ipv6_count_addresses(struct inet6_dev *idev)
1175 struct inet6_ifaddr *ifp;
1177 read_lock_bh(&idev->lock);
1178 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1180 read_unlock_bh(&idev->lock);
1184 int ipv6_chk_addr(struct in6_addr *addr, struct net_device *dev, int strict)
1186 struct inet6_ifaddr * ifp;
1187 u8 hash = ipv6_addr_hash(addr);
1189 read_lock_bh(&addrconf_hash_lock);
1190 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1191 if (ipv6_addr_equal(&ifp->addr, addr) &&
1192 !(ifp->flags&IFA_F_TENTATIVE)) {
1193 if (dev == NULL || ifp->idev->dev == dev ||
1194 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1198 read_unlock_bh(&addrconf_hash_lock);
1202 EXPORT_SYMBOL(ipv6_chk_addr);
1205 int ipv6_chk_same_addr(const struct in6_addr *addr, struct net_device *dev)
1207 struct inet6_ifaddr * ifp;
1208 u8 hash = ipv6_addr_hash(addr);
1210 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1211 if (ipv6_addr_equal(&ifp->addr, addr)) {
1212 if (dev == NULL || ifp->idev->dev == dev)
1219 struct inet6_ifaddr * ipv6_get_ifaddr(struct in6_addr *addr, struct net_device *dev, int strict)
1221 struct inet6_ifaddr * ifp;
1222 u8 hash = ipv6_addr_hash(addr);
1224 read_lock_bh(&addrconf_hash_lock);
1225 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1226 if (ipv6_addr_equal(&ifp->addr, addr)) {
1227 if (dev == NULL || ifp->idev->dev == dev ||
1228 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1234 read_unlock_bh(&addrconf_hash_lock);
1239 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1241 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1242 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
1243 __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1244 __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1245 int sk_ipv6only = ipv6_only_sock(sk);
1246 int sk2_ipv6only = inet_v6_ipv6only(sk2);
1247 int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1248 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1250 if (!sk2_rcv_saddr && !sk_ipv6only)
1253 if (addr_type2 == IPV6_ADDR_ANY &&
1254 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1257 if (addr_type == IPV6_ADDR_ANY &&
1258 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1261 if (sk2_rcv_saddr6 &&
1262 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1265 if (addr_type == IPV6_ADDR_MAPPED &&
1267 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1273 /* Gets referenced address, destroys ifaddr */
1275 static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1277 if (ifp->flags&IFA_F_PERMANENT) {
1278 spin_lock_bh(&ifp->lock);
1279 addrconf_del_timer(ifp);
1280 ifp->flags |= IFA_F_TENTATIVE;
1281 spin_unlock_bh(&ifp->lock);
1283 #ifdef CONFIG_IPV6_PRIVACY
1284 } else if (ifp->flags&IFA_F_TEMPORARY) {
1285 struct inet6_ifaddr *ifpub;
1286 spin_lock_bh(&ifp->lock);
1289 in6_ifa_hold(ifpub);
1290 spin_unlock_bh(&ifp->lock);
1291 ipv6_create_tempaddr(ifpub, ifp);
1294 spin_unlock_bh(&ifp->lock);
1302 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1304 if (net_ratelimit())
1305 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1306 addrconf_dad_stop(ifp);
1309 /* Join to solicited addr multicast group. */
1311 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1313 struct in6_addr maddr;
1315 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1318 addrconf_addr_solict_mult(addr, &maddr);
1319 ipv6_dev_mc_inc(dev, &maddr);
1322 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1324 struct in6_addr maddr;
1326 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1329 addrconf_addr_solict_mult(addr, &maddr);
1330 __ipv6_dev_mc_dec(idev, &maddr);
1333 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1335 struct in6_addr addr;
1336 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1337 if (ipv6_addr_any(&addr))
1339 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1342 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1344 struct in6_addr addr;
1345 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1346 if (ipv6_addr_any(&addr))
1348 __ipv6_dev_ac_dec(ifp->idev, &addr);
1351 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1353 if (dev->addr_len != ETH_ALEN)
1355 memcpy(eui, dev->dev_addr, 3);
1356 memcpy(eui + 5, dev->dev_addr + 3, 3);
1359 * The zSeries OSA network cards can be shared among various
1360 * OS instances, but the OSA cards have only one MAC address.
1361 * This leads to duplicate address conflicts in conjunction
1362 * with IPv6 if more than one instance uses the same card.
1364 * The driver for these cards can deliver a unique 16-bit
1365 * identifier for each instance sharing the same card. It is
1366 * placed instead of 0xFFFE in the interface identifier. The
1367 * "u" bit of the interface identifier is not inverted in this
1368 * case. Hence the resulting interface identifier has local
1369 * scope according to RFC2373.
1372 eui[3] = (dev->dev_id >> 8) & 0xFF;
1373 eui[4] = dev->dev_id & 0xFF;
1382 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1384 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1385 if (dev->addr_len != ARCNET_ALEN)
1388 eui[7] = *(u8*)dev->dev_addr;
1392 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1394 if (dev->addr_len != INFINIBAND_ALEN)
1396 memcpy(eui, dev->dev_addr + 12, 8);
1401 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1403 switch (dev->type) {
1406 case ARPHRD_IEEE802_TR:
1407 return addrconf_ifid_eui48(eui, dev);
1409 return addrconf_ifid_arcnet(eui, dev);
1410 case ARPHRD_INFINIBAND:
1411 return addrconf_ifid_infiniband(eui, dev);
1416 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1419 struct inet6_ifaddr *ifp;
1421 read_lock_bh(&idev->lock);
1422 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1423 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1424 memcpy(eui, ifp->addr.s6_addr+8, 8);
1429 read_unlock_bh(&idev->lock);
1433 #ifdef CONFIG_IPV6_PRIVACY
1434 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1435 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1438 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1439 idev->rndid[0] &= ~0x02;
1442 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1443 * check if generated address is not inappropriate
1445 * - Reserved subnet anycast (RFC 2526)
1446 * 11111101 11....11 1xxxxxxx
1447 * - ISATAP (draft-ietf-ngtrans-isatap-13.txt) 5.1
1448 * 00-00-5E-FE-xx-xx-xx-xx
1450 * - XXX: already assigned to an address on the device
1452 if (idev->rndid[0] == 0xfd &&
1453 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1454 (idev->rndid[7]&0x80))
1456 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1457 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1459 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1466 static void ipv6_regen_rndid(unsigned long data)
1468 struct inet6_dev *idev = (struct inet6_dev *) data;
1469 unsigned long expires;
1472 write_lock_bh(&idev->lock);
1477 if (__ipv6_regen_rndid(idev) < 0)
1481 idev->cnf.temp_prefered_lft * HZ -
1482 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1483 if (time_before(expires, jiffies)) {
1485 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1490 if (!mod_timer(&idev->regen_timer, expires))
1494 write_unlock_bh(&idev->lock);
1495 rcu_read_unlock_bh();
1499 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1502 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1503 ret = __ipv6_regen_rndid(idev);
1513 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1514 unsigned long expires, u32 flags)
1516 struct fib6_config cfg = {
1517 .fc_table = RT6_TABLE_PREFIX,
1518 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1519 .fc_ifindex = dev->ifindex,
1520 .fc_expires = expires,
1522 .fc_flags = RTF_UP | flags,
1525 ipv6_addr_copy(&cfg.fc_dst, pfx);
1527 /* Prevent useless cloning on PtP SIT.
1528 This thing is done here expecting that the whole
1529 class of non-broadcast devices need not cloning.
1531 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1532 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1533 cfg.fc_flags |= RTF_NONEXTHOP;
1536 ip6_route_add(&cfg);
1539 /* Create "default" multicast route to the interface */
1541 static void addrconf_add_mroute(struct net_device *dev)
1543 struct fib6_config cfg = {
1544 .fc_table = RT6_TABLE_LOCAL,
1545 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1546 .fc_ifindex = dev->ifindex,
1551 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1553 ip6_route_add(&cfg);
1556 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1557 static void sit_route_add(struct net_device *dev)
1559 struct fib6_config cfg = {
1560 .fc_table = RT6_TABLE_MAIN,
1561 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1562 .fc_ifindex = dev->ifindex,
1564 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1567 /* prefix length - 96 bits "::d.d.d.d" */
1568 ip6_route_add(&cfg);
1572 static void addrconf_add_lroute(struct net_device *dev)
1574 struct in6_addr addr;
1576 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1577 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1580 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1582 struct inet6_dev *idev;
1586 if ((idev = ipv6_find_idev(dev)) == NULL)
1589 /* Add default multicast route */
1590 addrconf_add_mroute(dev);
1592 /* Add link local route */
1593 addrconf_add_lroute(dev);
1597 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1599 struct prefix_info *pinfo;
1603 unsigned long rt_expires;
1604 struct inet6_dev *in6_dev;
1606 pinfo = (struct prefix_info *) opt;
1608 if (len < sizeof(struct prefix_info)) {
1609 ADBG(("addrconf: prefix option too short\n"));
1614 * Validation checks ([ADDRCONF], page 19)
1617 addr_type = ipv6_addr_type(&pinfo->prefix);
1619 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1622 valid_lft = ntohl(pinfo->valid);
1623 prefered_lft = ntohl(pinfo->prefered);
1625 if (prefered_lft > valid_lft) {
1626 if (net_ratelimit())
1627 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1631 in6_dev = in6_dev_get(dev);
1633 if (in6_dev == NULL) {
1634 if (net_ratelimit())
1635 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1640 * Two things going on here:
1641 * 1) Add routes for on-link prefixes
1642 * 2) Configure prefixes with the auto flag set
1645 /* Avoid arithmetic overflow. Really, we could
1646 save rt_expires in seconds, likely valid_lft,
1647 but it would require division in fib gc, that it
1650 if (valid_lft >= 0x7FFFFFFF/HZ)
1651 rt_expires = 0x7FFFFFFF - (0x7FFFFFFF % HZ);
1653 rt_expires = valid_lft * HZ;
1656 * We convert this (in jiffies) to clock_t later.
1657 * Avoid arithmetic overflow there as well.
1658 * Overflow can happen only if HZ < USER_HZ.
1660 if (HZ < USER_HZ && rt_expires > 0x7FFFFFFF / USER_HZ)
1661 rt_expires = 0x7FFFFFFF / USER_HZ;
1663 if (pinfo->onlink) {
1664 struct rt6_info *rt;
1665 rt = rt6_lookup(&pinfo->prefix, NULL, dev->ifindex, 1);
1667 if (rt && ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0)) {
1668 if (rt->rt6i_flags&RTF_EXPIRES) {
1669 if (valid_lft == 0) {
1673 rt->rt6i_expires = jiffies + rt_expires;
1676 } else if (valid_lft) {
1677 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1678 dev, jiffies_to_clock_t(rt_expires), RTF_ADDRCONF|RTF_EXPIRES|RTF_PREFIX_RT);
1681 dst_release(&rt->u.dst);
1684 /* Try to figure out our local address for this prefix */
1686 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1687 struct inet6_ifaddr * ifp;
1688 struct in6_addr addr;
1689 int create = 0, update_lft = 0;
1691 if (pinfo->prefix_len == 64) {
1692 memcpy(&addr, &pinfo->prefix, 8);
1693 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1694 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1695 in6_dev_put(in6_dev);
1700 if (net_ratelimit())
1701 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1703 in6_dev_put(in6_dev);
1708 ifp = ipv6_get_ifaddr(&addr, dev, 1);
1710 if (ifp == NULL && valid_lft) {
1711 int max_addresses = in6_dev->cnf.max_addresses;
1714 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1715 if (in6_dev->cnf.optimistic_dad &&
1716 !ipv6_devconf.forwarding)
1717 addr_flags = IFA_F_OPTIMISTIC;
1720 /* Do not allow to create too much of autoconfigured
1721 * addresses; this would be too easy way to crash kernel.
1723 if (!max_addresses ||
1724 ipv6_count_addresses(in6_dev) < max_addresses)
1725 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1726 addr_type&IPV6_ADDR_SCOPE_MASK,
1729 if (!ifp || IS_ERR(ifp)) {
1730 in6_dev_put(in6_dev);
1734 update_lft = create = 1;
1735 ifp->cstamp = jiffies;
1736 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1742 #ifdef CONFIG_IPV6_PRIVACY
1743 struct inet6_ifaddr *ift;
1747 /* update lifetime (RFC2462 5.5.3 e) */
1748 spin_lock(&ifp->lock);
1750 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1751 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1754 if (!update_lft && stored_lft) {
1755 if (valid_lft > MIN_VALID_LIFETIME ||
1756 valid_lft > stored_lft)
1758 else if (stored_lft <= MIN_VALID_LIFETIME) {
1759 /* valid_lft <= stored_lft is always true */
1763 valid_lft = MIN_VALID_LIFETIME;
1764 if (valid_lft < prefered_lft)
1765 prefered_lft = valid_lft;
1771 ifp->valid_lft = valid_lft;
1772 ifp->prefered_lft = prefered_lft;
1775 ifp->flags &= ~IFA_F_DEPRECATED;
1776 spin_unlock(&ifp->lock);
1778 if (!(flags&IFA_F_TENTATIVE))
1779 ipv6_ifa_notify(0, ifp);
1781 spin_unlock(&ifp->lock);
1783 #ifdef CONFIG_IPV6_PRIVACY
1784 read_lock_bh(&in6_dev->lock);
1785 /* update all temporary addresses in the list */
1786 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1788 * When adjusting the lifetimes of an existing
1789 * temporary address, only lower the lifetimes.
1790 * Implementations must not increase the
1791 * lifetimes of an existing temporary address
1792 * when processing a Prefix Information Option.
1794 spin_lock(&ift->lock);
1796 if (ift->valid_lft > valid_lft &&
1797 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1798 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1799 if (ift->prefered_lft > prefered_lft &&
1800 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1801 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1802 spin_unlock(&ift->lock);
1803 if (!(flags&IFA_F_TENTATIVE))
1804 ipv6_ifa_notify(0, ift);
1807 if (create && in6_dev->cnf.use_tempaddr > 0) {
1809 * When a new public address is created as described in [ADDRCONF],
1810 * also create a new temporary address.
1812 read_unlock_bh(&in6_dev->lock);
1813 ipv6_create_tempaddr(ifp, NULL);
1815 read_unlock_bh(&in6_dev->lock);
1822 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1823 in6_dev_put(in6_dev);
1827 * Set destination address.
1828 * Special case for SIT interfaces where we create a new "virtual"
1831 int addrconf_set_dstaddr(void __user *arg)
1833 struct in6_ifreq ireq;
1834 struct net_device *dev;
1840 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1843 dev = __dev_get_by_index(&init_net, ireq.ifr6_ifindex);
1849 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1850 if (dev->type == ARPHRD_SIT) {
1853 struct ip_tunnel_parm p;
1855 err = -EADDRNOTAVAIL;
1856 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
1859 memset(&p, 0, sizeof(p));
1860 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
1864 p.iph.protocol = IPPROTO_IPV6;
1866 ifr.ifr_ifru.ifru_data = (void __user *)&p;
1868 oldfs = get_fs(); set_fs(KERNEL_DS);
1869 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
1874 if ((dev = __dev_get_by_name(&init_net, p.name)) == NULL)
1876 err = dev_open(dev);
1887 * Manual configuration of address on an interface
1889 static int inet6_addr_add(int ifindex, struct in6_addr *pfx, int plen,
1890 __u8 ifa_flags, __u32 prefered_lft, __u32 valid_lft)
1892 struct inet6_ifaddr *ifp;
1893 struct inet6_dev *idev;
1894 struct net_device *dev;
1896 u32 flags = RTF_EXPIRES;
1900 /* check the lifetime */
1901 if (!valid_lft || prefered_lft > valid_lft)
1904 if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL)
1907 if ((idev = addrconf_add_dev(dev)) == NULL)
1910 scope = ipv6_addr_scope(pfx);
1912 if (valid_lft == INFINITY_LIFE_TIME) {
1913 ifa_flags |= IFA_F_PERMANENT;
1915 } else if (valid_lft >= 0x7FFFFFFF/HZ)
1916 valid_lft = 0x7FFFFFFF/HZ;
1918 if (prefered_lft == 0)
1919 ifa_flags |= IFA_F_DEPRECATED;
1920 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
1921 (prefered_lft != INFINITY_LIFE_TIME))
1922 prefered_lft = 0x7FFFFFFF/HZ;
1924 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
1927 spin_lock_bh(&ifp->lock);
1928 ifp->valid_lft = valid_lft;
1929 ifp->prefered_lft = prefered_lft;
1930 ifp->tstamp = jiffies;
1931 spin_unlock_bh(&ifp->lock);
1933 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
1934 jiffies_to_clock_t(valid_lft * HZ), flags);
1936 * Note that section 3.1 of RFC 4429 indicates
1937 * that the Optimistic flag should not be set for
1938 * manually configured addresses
1940 addrconf_dad_start(ifp, 0);
1946 return PTR_ERR(ifp);
1949 static int inet6_addr_del(int ifindex, struct in6_addr *pfx, int plen)
1951 struct inet6_ifaddr *ifp;
1952 struct inet6_dev *idev;
1953 struct net_device *dev;
1955 if ((dev = __dev_get_by_index(&init_net, ifindex)) == NULL)
1958 if ((idev = __in6_dev_get(dev)) == NULL)
1961 read_lock_bh(&idev->lock);
1962 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
1963 if (ifp->prefix_len == plen &&
1964 ipv6_addr_equal(pfx, &ifp->addr)) {
1966 read_unlock_bh(&idev->lock);
1970 /* If the last address is deleted administratively,
1971 disable IPv6 on this interface.
1973 if (idev->addr_list == NULL)
1974 addrconf_ifdown(idev->dev, 1);
1978 read_unlock_bh(&idev->lock);
1979 return -EADDRNOTAVAIL;
1983 int addrconf_add_ifaddr(void __user *arg)
1985 struct in6_ifreq ireq;
1988 if (!capable(CAP_NET_ADMIN))
1991 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1995 err = inet6_addr_add(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen,
1996 IFA_F_PERMANENT, INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2001 int addrconf_del_ifaddr(void __user *arg)
2003 struct in6_ifreq ireq;
2006 if (!capable(CAP_NET_ADMIN))
2009 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2013 err = inet6_addr_del(ireq.ifr6_ifindex, &ireq.ifr6_addr, ireq.ifr6_prefixlen);
2018 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2019 static void sit_add_v4_addrs(struct inet6_dev *idev)
2021 struct inet6_ifaddr * ifp;
2022 struct in6_addr addr;
2023 struct net_device *dev;
2028 memset(&addr, 0, sizeof(struct in6_addr));
2029 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2031 if (idev->dev->flags&IFF_POINTOPOINT) {
2032 addr.s6_addr32[0] = htonl(0xfe800000);
2035 scope = IPV6_ADDR_COMPATv4;
2038 if (addr.s6_addr32[3]) {
2039 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
2041 spin_lock_bh(&ifp->lock);
2042 ifp->flags &= ~IFA_F_TENTATIVE;
2043 spin_unlock_bh(&ifp->lock);
2044 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2050 for_each_netdev(&init_net, dev) {
2051 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2052 if (in_dev && (dev->flags & IFF_UP)) {
2053 struct in_ifaddr * ifa;
2057 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2060 addr.s6_addr32[3] = ifa->ifa_local;
2062 if (ifa->ifa_scope == RT_SCOPE_LINK)
2064 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2065 if (idev->dev->flags&IFF_POINTOPOINT)
2069 if (idev->dev->flags&IFF_POINTOPOINT)
2074 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2077 spin_lock_bh(&ifp->lock);
2078 ifp->flags &= ~IFA_F_TENTATIVE;
2079 spin_unlock_bh(&ifp->lock);
2080 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2089 static void init_loopback(struct net_device *dev)
2091 struct inet6_dev *idev;
2092 struct inet6_ifaddr * ifp;
2098 if ((idev = ipv6_find_idev(dev)) == NULL) {
2099 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2103 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2105 spin_lock_bh(&ifp->lock);
2106 ifp->flags &= ~IFA_F_TENTATIVE;
2107 spin_unlock_bh(&ifp->lock);
2108 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2113 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2115 struct inet6_ifaddr * ifp;
2116 u32 addr_flags = IFA_F_PERMANENT;
2118 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2119 if (idev->cnf.optimistic_dad &&
2120 !ipv6_devconf.forwarding)
2121 addr_flags |= IFA_F_OPTIMISTIC;
2125 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2127 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2128 addrconf_dad_start(ifp, 0);
2133 static void addrconf_dev_config(struct net_device *dev)
2135 struct in6_addr addr;
2136 struct inet6_dev * idev;
2140 if ((dev->type != ARPHRD_ETHER) &&
2141 (dev->type != ARPHRD_FDDI) &&
2142 (dev->type != ARPHRD_IEEE802_TR) &&
2143 (dev->type != ARPHRD_ARCNET) &&
2144 (dev->type != ARPHRD_INFINIBAND)) {
2145 /* Alas, we support only Ethernet autoconfiguration. */
2149 idev = addrconf_add_dev(dev);
2153 memset(&addr, 0, sizeof(struct in6_addr));
2154 addr.s6_addr32[0] = htonl(0xFE800000);
2156 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2157 addrconf_add_linklocal(idev, &addr);
2160 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2161 static void addrconf_sit_config(struct net_device *dev)
2163 struct inet6_dev *idev;
2168 * Configure the tunnel with one of our IPv4
2169 * addresses... we should configure all of
2170 * our v4 addrs in the tunnel
2173 if ((idev = ipv6_find_idev(dev)) == NULL) {
2174 printk(KERN_DEBUG "init sit: add_dev failed\n");
2178 sit_add_v4_addrs(idev);
2180 if (dev->flags&IFF_POINTOPOINT) {
2181 addrconf_add_mroute(dev);
2182 addrconf_add_lroute(dev);
2189 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2191 struct in6_addr lladdr;
2193 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2194 addrconf_add_linklocal(idev, &lladdr);
2200 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2202 struct net_device *link_dev;
2204 /* first try to inherit the link-local address from the link device */
2205 if (idev->dev->iflink &&
2206 (link_dev = __dev_get_by_index(&init_net, idev->dev->iflink))) {
2207 if (!ipv6_inherit_linklocal(idev, link_dev))
2210 /* then try to inherit it from any device */
2211 for_each_netdev(&init_net, link_dev) {
2212 if (!ipv6_inherit_linklocal(idev, link_dev))
2215 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2219 * Autoconfigure tunnel with a link-local address so routing protocols,
2220 * DHCPv6, MLD etc. can be run over the virtual link
2223 static void addrconf_ip6_tnl_config(struct net_device *dev)
2225 struct inet6_dev *idev;
2229 if ((idev = addrconf_add_dev(dev)) == NULL) {
2230 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2233 ip6_tnl_add_linklocal(idev);
2236 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2239 struct net_device *dev = (struct net_device *) data;
2240 struct inet6_dev *idev = __in6_dev_get(dev);
2241 int run_pending = 0;
2244 if (dev->nd_net != &init_net)
2248 case NETDEV_REGISTER:
2249 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2250 idev = ipv6_add_dev(dev);
2252 return notifier_from_errno(-ENOMEM);
2257 if (dev->flags & IFF_SLAVE)
2260 if (event == NETDEV_UP) {
2261 if (!addrconf_qdisc_ok(dev)) {
2262 /* device is not ready yet. */
2264 "ADDRCONF(NETDEV_UP): %s: "
2265 "link is not ready\n",
2270 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2271 idev = ipv6_add_dev(dev);
2274 idev->if_flags |= IF_READY;
2276 if (!addrconf_qdisc_ok(dev)) {
2277 /* device is still not ready. */
2282 if (idev->if_flags & IF_READY) {
2283 /* device is already configured. */
2286 idev->if_flags |= IF_READY;
2290 "ADDRCONF(NETDEV_CHANGE): %s: "
2291 "link becomes ready\n",
2298 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2300 addrconf_sit_config(dev);
2303 case ARPHRD_TUNNEL6:
2304 addrconf_ip6_tnl_config(dev);
2306 case ARPHRD_LOOPBACK:
2311 addrconf_dev_config(dev);
2316 addrconf_dad_run(idev);
2318 /* If the MTU changed during the interface down, when the
2319 interface up, the changed MTU must be reflected in the
2320 idev as well as routers.
2322 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2323 rt6_mtu_change(dev, dev->mtu);
2324 idev->cnf.mtu6 = dev->mtu;
2326 idev->tstamp = jiffies;
2327 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2328 /* If the changed mtu during down is lower than IPV6_MIN_MTU
2329 stop IPv6 on this interface.
2331 if (dev->mtu < IPV6_MIN_MTU)
2332 addrconf_ifdown(dev, event != NETDEV_DOWN);
2336 case NETDEV_CHANGEMTU:
2337 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2338 rt6_mtu_change(dev, dev->mtu);
2339 idev->cnf.mtu6 = dev->mtu;
2343 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2344 idev = ipv6_add_dev(dev);
2349 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2352 case NETDEV_UNREGISTER:
2354 * Remove all addresses from this interface.
2356 addrconf_ifdown(dev, event != NETDEV_DOWN);
2359 case NETDEV_CHANGENAME:
2361 snmp6_unregister_dev(idev);
2362 #ifdef CONFIG_SYSCTL
2363 addrconf_sysctl_unregister(&idev->cnf);
2364 neigh_sysctl_unregister(idev->nd_parms);
2365 neigh_sysctl_register(dev, idev->nd_parms,
2366 NET_IPV6, NET_IPV6_NEIGH, "ipv6",
2367 &ndisc_ifinfo_sysctl_change,
2369 addrconf_sysctl_register(idev, &idev->cnf);
2371 err = snmp6_register_dev(idev);
2373 return notifier_from_errno(err);
2382 * addrconf module should be notified of a device going up
2384 static struct notifier_block ipv6_dev_notf = {
2385 .notifier_call = addrconf_notify,
2389 static int addrconf_ifdown(struct net_device *dev, int how)
2391 struct inet6_dev *idev;
2392 struct inet6_ifaddr *ifa, **bifa;
2397 if (dev == init_net.loopback_dev && how == 1)
2401 neigh_ifdown(&nd_tbl, dev);
2403 idev = __in6_dev_get(dev);
2407 /* Step 1: remove reference to ipv6 device from parent device.
2413 /* protected by rtnl_lock */
2414 rcu_assign_pointer(dev->ip6_ptr, NULL);
2416 /* Step 1.5: remove snmp6 entry */
2417 snmp6_unregister_dev(idev);
2421 /* Step 2: clear hash table */
2422 for (i=0; i<IN6_ADDR_HSIZE; i++) {
2423 bifa = &inet6_addr_lst[i];
2425 write_lock_bh(&addrconf_hash_lock);
2426 while ((ifa = *bifa) != NULL) {
2427 if (ifa->idev == idev) {
2428 *bifa = ifa->lst_next;
2429 ifa->lst_next = NULL;
2430 addrconf_del_timer(ifa);
2434 bifa = &ifa->lst_next;
2436 write_unlock_bh(&addrconf_hash_lock);
2439 write_lock_bh(&idev->lock);
2441 /* Step 3: clear flags for stateless addrconf */
2443 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2445 /* Step 4: clear address list */
2446 #ifdef CONFIG_IPV6_PRIVACY
2447 if (how == 1 && del_timer(&idev->regen_timer))
2450 /* clear tempaddr list */
2451 while ((ifa = idev->tempaddr_list) != NULL) {
2452 idev->tempaddr_list = ifa->tmp_next;
2453 ifa->tmp_next = NULL;
2455 write_unlock_bh(&idev->lock);
2456 spin_lock_bh(&ifa->lock);
2459 in6_ifa_put(ifa->ifpub);
2462 spin_unlock_bh(&ifa->lock);
2464 write_lock_bh(&idev->lock);
2467 while ((ifa = idev->addr_list) != NULL) {
2468 idev->addr_list = ifa->if_next;
2469 ifa->if_next = NULL;
2471 addrconf_del_timer(ifa);
2472 write_unlock_bh(&idev->lock);
2474 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2475 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2478 write_lock_bh(&idev->lock);
2480 write_unlock_bh(&idev->lock);
2482 /* Step 5: Discard multicast list */
2485 ipv6_mc_destroy_dev(idev);
2489 idev->tstamp = jiffies;
2491 /* Shot the device (if unregistered) */
2494 #ifdef CONFIG_SYSCTL
2495 addrconf_sysctl_unregister(&idev->cnf);
2496 neigh_sysctl_unregister(idev->nd_parms);
2498 neigh_parms_release(&nd_tbl, idev->nd_parms);
2499 neigh_ifdown(&nd_tbl, dev);
2505 static void addrconf_rs_timer(unsigned long data)
2507 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2509 if (ifp->idev->cnf.forwarding)
2512 if (ifp->idev->if_flags & IF_RA_RCVD) {
2514 * Announcement received after solicitation
2520 spin_lock(&ifp->lock);
2521 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2522 struct in6_addr all_routers;
2524 /* The wait after the last probe can be shorter */
2525 addrconf_mod_timer(ifp, AC_RS,
2526 (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2527 ifp->idev->cnf.rtr_solicit_delay :
2528 ifp->idev->cnf.rtr_solicit_interval);
2529 spin_unlock(&ifp->lock);
2531 ipv6_addr_all_routers(&all_routers);
2533 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2535 spin_unlock(&ifp->lock);
2537 * Note: we do not support deprecated "all on-link"
2538 * assumption any longer.
2540 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2541 ifp->idev->dev->name);
2549 * Duplicate Address Detection
2551 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2553 unsigned long rand_num;
2554 struct inet6_dev *idev = ifp->idev;
2556 if (ifp->flags & IFA_F_OPTIMISTIC)
2559 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2561 ifp->probes = idev->cnf.dad_transmits;
2562 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2565 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2567 struct inet6_dev *idev = ifp->idev;
2568 struct net_device *dev = idev->dev;
2570 addrconf_join_solict(dev, &ifp->addr);
2572 net_srandom(ifp->addr.s6_addr32[3]);
2574 read_lock_bh(&idev->lock);
2577 spin_lock_bh(&ifp->lock);
2579 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2580 !(ifp->flags&IFA_F_TENTATIVE) ||
2581 ifp->flags & IFA_F_NODAD) {
2582 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2583 spin_unlock_bh(&ifp->lock);
2584 read_unlock_bh(&idev->lock);
2586 addrconf_dad_completed(ifp);
2590 if (!(idev->if_flags & IF_READY)) {
2591 spin_unlock_bh(&ifp->lock);
2592 read_unlock_bh(&idev->lock);
2594 * If the defice is not ready:
2595 * - keep it tentative if it is a permanent address.
2596 * - otherwise, kill it.
2599 addrconf_dad_stop(ifp);
2604 * Optimistic nodes can start receiving
2607 if(ifp->flags & IFA_F_OPTIMISTIC)
2608 ip6_ins_rt(ifp->rt);
2610 addrconf_dad_kick(ifp);
2611 spin_unlock_bh(&ifp->lock);
2613 read_unlock_bh(&idev->lock);
2616 static void addrconf_dad_timer(unsigned long data)
2618 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2619 struct inet6_dev *idev = ifp->idev;
2620 struct in6_addr unspec;
2621 struct in6_addr mcaddr;
2623 read_lock_bh(&idev->lock);
2625 read_unlock_bh(&idev->lock);
2628 spin_lock_bh(&ifp->lock);
2629 if (ifp->probes == 0) {
2631 * DAD was successful
2634 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2635 spin_unlock_bh(&ifp->lock);
2636 read_unlock_bh(&idev->lock);
2638 addrconf_dad_completed(ifp);
2644 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2645 spin_unlock_bh(&ifp->lock);
2646 read_unlock_bh(&idev->lock);
2648 /* send a neighbour solicitation for our addr */
2649 memset(&unspec, 0, sizeof(unspec));
2650 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2651 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &unspec);
2656 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2658 struct net_device * dev = ifp->idev->dev;
2661 * Configure the address for reception. Now it is valid.
2664 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2666 /* If added prefix is link local and forwarding is off,
2667 start sending router solicitations.
2670 if (ifp->idev->cnf.forwarding == 0 &&
2671 ifp->idev->cnf.rtr_solicits > 0 &&
2672 (dev->flags&IFF_LOOPBACK) == 0 &&
2673 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2674 struct in6_addr all_routers;
2676 ipv6_addr_all_routers(&all_routers);
2679 * If a host as already performed a random delay
2680 * [...] as part of DAD [...] there is no need
2681 * to delay again before sending the first RS
2683 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &all_routers);
2685 spin_lock_bh(&ifp->lock);
2687 ifp->idev->if_flags |= IF_RS_SENT;
2688 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2689 spin_unlock_bh(&ifp->lock);
2693 static void addrconf_dad_run(struct inet6_dev *idev) {
2694 struct inet6_ifaddr *ifp;
2696 read_lock_bh(&idev->lock);
2697 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2698 spin_lock_bh(&ifp->lock);
2699 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2700 spin_unlock_bh(&ifp->lock);
2703 spin_unlock_bh(&ifp->lock);
2704 addrconf_dad_kick(ifp);
2706 read_unlock_bh(&idev->lock);
2709 #ifdef CONFIG_PROC_FS
2710 struct if6_iter_state {
2714 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2716 struct inet6_ifaddr *ifa = NULL;
2717 struct if6_iter_state *state = seq->private;
2719 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2720 ifa = inet6_addr_lst[state->bucket];
2727 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2729 struct if6_iter_state *state = seq->private;
2731 ifa = ifa->lst_next;
2733 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2734 ifa = inet6_addr_lst[state->bucket];
2740 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2742 struct inet6_ifaddr *ifa = if6_get_first(seq);
2745 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2747 return pos ? NULL : ifa;
2750 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2752 read_lock_bh(&addrconf_hash_lock);
2753 return if6_get_idx(seq, *pos);
2756 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2758 struct inet6_ifaddr *ifa;
2760 ifa = if6_get_next(seq, v);
2765 static void if6_seq_stop(struct seq_file *seq, void *v)
2767 read_unlock_bh(&addrconf_hash_lock);
2770 static int if6_seq_show(struct seq_file *seq, void *v)
2772 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2774 NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
2776 ifp->idev->dev->ifindex,
2780 ifp->idev->dev->name);
2784 static const struct seq_operations if6_seq_ops = {
2785 .start = if6_seq_start,
2786 .next = if6_seq_next,
2787 .show = if6_seq_show,
2788 .stop = if6_seq_stop,
2791 static int if6_seq_open(struct inode *inode, struct file *file)
2793 return seq_open_private(file, &if6_seq_ops,
2794 sizeof(struct if6_iter_state));
2797 static const struct file_operations if6_fops = {
2798 .owner = THIS_MODULE,
2799 .open = if6_seq_open,
2801 .llseek = seq_lseek,
2802 .release = seq_release_private,
2805 int __init if6_proc_init(void)
2807 if (!proc_net_fops_create(&init_net, "if_inet6", S_IRUGO, &if6_fops))
2812 void if6_proc_exit(void)
2814 proc_net_remove(&init_net, "if_inet6");
2816 #endif /* CONFIG_PROC_FS */
2818 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
2819 /* Check if address is a home address configured on any interface. */
2820 int ipv6_chk_home_addr(struct in6_addr *addr)
2823 struct inet6_ifaddr * ifp;
2824 u8 hash = ipv6_addr_hash(addr);
2825 read_lock_bh(&addrconf_hash_lock);
2826 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
2827 if (ipv6_addr_cmp(&ifp->addr, addr) == 0 &&
2828 (ifp->flags & IFA_F_HOMEADDRESS)) {
2833 read_unlock_bh(&addrconf_hash_lock);
2839 * Periodic address status verification
2842 static void addrconf_verify(unsigned long foo)
2844 struct inet6_ifaddr *ifp;
2845 unsigned long now, next;
2848 spin_lock_bh(&addrconf_verify_lock);
2850 next = now + ADDR_CHECK_FREQUENCY;
2852 del_timer(&addr_chk_timer);
2854 for (i=0; i < IN6_ADDR_HSIZE; i++) {
2857 read_lock(&addrconf_hash_lock);
2858 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
2860 #ifdef CONFIG_IPV6_PRIVACY
2861 unsigned long regen_advance;
2864 if (ifp->flags & IFA_F_PERMANENT)
2867 spin_lock(&ifp->lock);
2868 age = (now - ifp->tstamp) / HZ;
2870 #ifdef CONFIG_IPV6_PRIVACY
2871 regen_advance = ifp->idev->cnf.regen_max_retry *
2872 ifp->idev->cnf.dad_transmits *
2873 ifp->idev->nd_parms->retrans_time / HZ;
2876 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
2877 age >= ifp->valid_lft) {
2878 spin_unlock(&ifp->lock);
2880 read_unlock(&addrconf_hash_lock);
2883 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
2884 spin_unlock(&ifp->lock);
2886 } else if (age >= ifp->prefered_lft) {
2887 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
2890 if (!(ifp->flags&IFA_F_DEPRECATED)) {
2892 ifp->flags |= IFA_F_DEPRECATED;
2895 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
2896 next = ifp->tstamp + ifp->valid_lft * HZ;
2898 spin_unlock(&ifp->lock);
2902 read_unlock(&addrconf_hash_lock);
2904 ipv6_ifa_notify(0, ifp);
2908 #ifdef CONFIG_IPV6_PRIVACY
2909 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
2910 !(ifp->flags&IFA_F_TENTATIVE)) {
2911 if (age >= ifp->prefered_lft - regen_advance) {
2912 struct inet6_ifaddr *ifpub = ifp->ifpub;
2913 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2914 next = ifp->tstamp + ifp->prefered_lft * HZ;
2915 if (!ifp->regen_count && ifpub) {
2918 in6_ifa_hold(ifpub);
2919 spin_unlock(&ifp->lock);
2920 read_unlock(&addrconf_hash_lock);
2921 spin_lock(&ifpub->lock);
2922 ifpub->regen_count = 0;
2923 spin_unlock(&ifpub->lock);
2924 ipv6_create_tempaddr(ifpub, ifp);
2929 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
2930 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
2931 spin_unlock(&ifp->lock);
2934 /* ifp->prefered_lft <= ifp->valid_lft */
2935 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
2936 next = ifp->tstamp + ifp->prefered_lft * HZ;
2937 spin_unlock(&ifp->lock);
2940 read_unlock(&addrconf_hash_lock);
2943 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
2944 add_timer(&addr_chk_timer);
2945 spin_unlock_bh(&addrconf_verify_lock);
2948 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
2950 struct in6_addr *pfx = NULL;
2953 pfx = nla_data(addr);
2956 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
2959 pfx = nla_data(local);
2965 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
2966 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
2967 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
2968 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
2972 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
2974 struct ifaddrmsg *ifm;
2975 struct nlattr *tb[IFA_MAX+1];
2976 struct in6_addr *pfx;
2979 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
2983 ifm = nlmsg_data(nlh);
2984 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
2988 return inet6_addr_del(ifm->ifa_index, pfx, ifm->ifa_prefixlen);
2991 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
2992 u32 prefered_lft, u32 valid_lft)
2994 u32 flags = RTF_EXPIRES;
2996 if (!valid_lft || (prefered_lft > valid_lft))
2999 if (valid_lft == INFINITY_LIFE_TIME) {
3000 ifa_flags |= IFA_F_PERMANENT;
3002 } else if (valid_lft >= 0x7FFFFFFF/HZ)
3003 valid_lft = 0x7FFFFFFF/HZ;
3005 if (prefered_lft == 0)
3006 ifa_flags |= IFA_F_DEPRECATED;
3007 else if ((prefered_lft >= 0x7FFFFFFF/HZ) &&
3008 (prefered_lft != INFINITY_LIFE_TIME))
3009 prefered_lft = 0x7FFFFFFF/HZ;
3011 spin_lock_bh(&ifp->lock);
3012 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3013 ifp->tstamp = jiffies;
3014 ifp->valid_lft = valid_lft;
3015 ifp->prefered_lft = prefered_lft;
3017 spin_unlock_bh(&ifp->lock);
3018 if (!(ifp->flags&IFA_F_TENTATIVE))
3019 ipv6_ifa_notify(0, ifp);
3021 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3022 jiffies_to_clock_t(valid_lft * HZ), flags);
3029 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3031 struct ifaddrmsg *ifm;
3032 struct nlattr *tb[IFA_MAX+1];
3033 struct in6_addr *pfx;
3034 struct inet6_ifaddr *ifa;
3035 struct net_device *dev;
3036 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3040 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3044 ifm = nlmsg_data(nlh);
3045 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3049 if (tb[IFA_CACHEINFO]) {
3050 struct ifa_cacheinfo *ci;
3052 ci = nla_data(tb[IFA_CACHEINFO]);
3053 valid_lft = ci->ifa_valid;
3054 preferred_lft = ci->ifa_prefered;
3056 preferred_lft = INFINITY_LIFE_TIME;
3057 valid_lft = INFINITY_LIFE_TIME;
3060 dev = __dev_get_by_index(&init_net, ifm->ifa_index);
3064 /* We ignore other flags so far. */
3065 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3067 ifa = ipv6_get_ifaddr(pfx, dev, 1);
3070 * It would be best to check for !NLM_F_CREATE here but
3071 * userspace alreay relies on not having to provide this.
3073 return inet6_addr_add(ifm->ifa_index, pfx, ifm->ifa_prefixlen,
3074 ifa_flags, preferred_lft, valid_lft);
3077 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3078 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3081 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3088 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3089 u8 scope, int ifindex)
3091 struct ifaddrmsg *ifm;
3093 ifm = nlmsg_data(nlh);
3094 ifm->ifa_family = AF_INET6;
3095 ifm->ifa_prefixlen = prefixlen;
3096 ifm->ifa_flags = flags;
3097 ifm->ifa_scope = scope;
3098 ifm->ifa_index = ifindex;
3101 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3102 unsigned long tstamp, u32 preferred, u32 valid)
3104 struct ifa_cacheinfo ci;
3106 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3107 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3108 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3109 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3110 ci.ifa_prefered = preferred;
3111 ci.ifa_valid = valid;
3113 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3116 static inline int rt_scope(int ifa_scope)
3118 if (ifa_scope & IFA_HOST)
3119 return RT_SCOPE_HOST;
3120 else if (ifa_scope & IFA_LINK)
3121 return RT_SCOPE_LINK;
3122 else if (ifa_scope & IFA_SITE)
3123 return RT_SCOPE_SITE;
3125 return RT_SCOPE_UNIVERSE;
3128 static inline int inet6_ifaddr_msgsize(void)
3130 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3131 + nla_total_size(16) /* IFA_ADDRESS */
3132 + nla_total_size(sizeof(struct ifa_cacheinfo));
3135 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3136 u32 pid, u32 seq, int event, unsigned int flags)
3138 struct nlmsghdr *nlh;
3139 u32 preferred, valid;
3141 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3145 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3146 ifa->idev->dev->ifindex);
3148 if (!(ifa->flags&IFA_F_PERMANENT)) {
3149 preferred = ifa->prefered_lft;
3150 valid = ifa->valid_lft;
3151 if (preferred != INFINITY_LIFE_TIME) {
3152 long tval = (jiffies - ifa->tstamp)/HZ;
3154 if (valid != INFINITY_LIFE_TIME)
3158 preferred = INFINITY_LIFE_TIME;
3159 valid = INFINITY_LIFE_TIME;
3162 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3163 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3164 nlmsg_cancel(skb, nlh);
3168 return nlmsg_end(skb, nlh);
3171 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3172 u32 pid, u32 seq, int event, u16 flags)
3174 struct nlmsghdr *nlh;
3175 u8 scope = RT_SCOPE_UNIVERSE;
3176 int ifindex = ifmca->idev->dev->ifindex;
3178 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3179 scope = RT_SCOPE_SITE;
3181 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3185 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3186 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3187 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3188 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3189 nlmsg_cancel(skb, nlh);
3193 return nlmsg_end(skb, nlh);
3196 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3197 u32 pid, u32 seq, int event, unsigned int flags)
3199 struct nlmsghdr *nlh;
3200 u8 scope = RT_SCOPE_UNIVERSE;
3201 int ifindex = ifaca->aca_idev->dev->ifindex;
3203 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3204 scope = RT_SCOPE_SITE;
3206 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3210 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3211 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3212 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3213 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3214 nlmsg_cancel(skb, nlh);
3218 return nlmsg_end(skb, nlh);
3228 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3229 enum addr_type_t type)
3232 int s_idx, s_ip_idx;
3234 struct net_device *dev;
3235 struct inet6_dev *idev = NULL;
3236 struct inet6_ifaddr *ifa;
3237 struct ifmcaddr6 *ifmca;
3238 struct ifacaddr6 *ifaca;
3240 s_idx = cb->args[0];
3241 s_ip_idx = ip_idx = cb->args[1];
3244 for_each_netdev(&init_net, dev) {
3250 if ((idev = in6_dev_get(dev)) == NULL)
3252 read_lock_bh(&idev->lock);
3255 /* unicast address incl. temp addr */
3256 for (ifa = idev->addr_list; ifa;
3257 ifa = ifa->if_next, ip_idx++) {
3258 if (ip_idx < s_ip_idx)
3260 if ((err = inet6_fill_ifaddr(skb, ifa,
3261 NETLINK_CB(cb->skb).pid,
3262 cb->nlh->nlmsg_seq, RTM_NEWADDR,
3267 case MULTICAST_ADDR:
3268 /* multicast address */
3269 for (ifmca = idev->mc_list; ifmca;
3270 ifmca = ifmca->next, ip_idx++) {
3271 if (ip_idx < s_ip_idx)
3273 if ((err = inet6_fill_ifmcaddr(skb, ifmca,
3274 NETLINK_CB(cb->skb).pid,
3275 cb->nlh->nlmsg_seq, RTM_GETMULTICAST,
3281 /* anycast address */
3282 for (ifaca = idev->ac_list; ifaca;
3283 ifaca = ifaca->aca_next, ip_idx++) {
3284 if (ip_idx < s_ip_idx)
3286 if ((err = inet6_fill_ifacaddr(skb, ifaca,
3287 NETLINK_CB(cb->skb).pid,
3288 cb->nlh->nlmsg_seq, RTM_GETANYCAST,
3296 read_unlock_bh(&idev->lock);
3303 read_unlock_bh(&idev->lock);
3307 cb->args[1] = ip_idx;
3311 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3313 enum addr_type_t type = UNICAST_ADDR;
3314 return inet6_dump_addr(skb, cb, type);
3317 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3319 enum addr_type_t type = MULTICAST_ADDR;
3320 return inet6_dump_addr(skb, cb, type);
3324 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3326 enum addr_type_t type = ANYCAST_ADDR;
3327 return inet6_dump_addr(skb, cb, type);
3330 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3333 struct ifaddrmsg *ifm;
3334 struct nlattr *tb[IFA_MAX+1];
3335 struct in6_addr *addr = NULL;
3336 struct net_device *dev = NULL;
3337 struct inet6_ifaddr *ifa;
3338 struct sk_buff *skb;
3341 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3345 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3351 ifm = nlmsg_data(nlh);
3353 dev = __dev_get_by_index(&init_net, ifm->ifa_index);
3355 if ((ifa = ipv6_get_ifaddr(addr, dev, 1)) == NULL) {
3356 err = -EADDRNOTAVAIL;
3360 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
3365 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3366 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3368 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3369 WARN_ON(err == -EMSGSIZE);
3373 err = rtnl_unicast(skb, NETLINK_CB(in_skb).pid);
3380 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3382 struct sk_buff *skb;
3385 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3389 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3391 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3392 WARN_ON(err == -EMSGSIZE);
3396 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3399 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err);
3402 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3403 __s32 *array, int bytes)
3405 BUG_ON(bytes < (DEVCONF_MAX * 4));
3407 memset(array, 0, bytes);
3408 array[DEVCONF_FORWARDING] = cnf->forwarding;
3409 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3410 array[DEVCONF_MTU6] = cnf->mtu6;
3411 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3412 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3413 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3414 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3415 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3416 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3417 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3418 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3419 #ifdef CONFIG_IPV6_PRIVACY
3420 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3421 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3422 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3423 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3424 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3426 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3427 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3428 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3429 #ifdef CONFIG_IPV6_ROUTER_PREF
3430 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3431 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3432 #ifdef CONFIG_IPV6_ROUTE_INFO
3433 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3436 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3437 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3438 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3439 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3443 static inline size_t inet6_if_nlmsg_size(void)
3445 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3446 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3447 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3448 + nla_total_size(4) /* IFLA_MTU */
3449 + nla_total_size(4) /* IFLA_LINK */
3450 + nla_total_size( /* IFLA_PROTINFO */
3451 nla_total_size(4) /* IFLA_INET6_FLAGS */
3452 + nla_total_size(sizeof(struct ifla_cacheinfo))
3453 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3454 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3455 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
3459 static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
3463 int pad = bytes - sizeof(u64) * items;
3466 /* Use put_unaligned() because stats may not be aligned for u64. */
3467 put_unaligned(items, &stats[0]);
3468 for (i = 1; i < items; i++)
3469 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3471 memset(&stats[items], 0, pad);
3474 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3478 case IFLA_INET6_STATS:
3479 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3481 case IFLA_INET6_ICMP6STATS:
3482 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3487 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3488 u32 pid, u32 seq, int event, unsigned int flags)
3490 struct net_device *dev = idev->dev;
3492 struct ifinfomsg *hdr;
3493 struct nlmsghdr *nlh;
3495 struct ifla_cacheinfo ci;
3497 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3501 hdr = nlmsg_data(nlh);
3502 hdr->ifi_family = AF_INET6;
3504 hdr->ifi_type = dev->type;
3505 hdr->ifi_index = dev->ifindex;
3506 hdr->ifi_flags = dev_get_flags(dev);
3507 hdr->ifi_change = 0;
3509 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3512 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3514 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3515 if (dev->ifindex != dev->iflink)
3516 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3518 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3519 if (protoinfo == NULL)
3520 goto nla_put_failure;
3522 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3524 ci.max_reasm_len = IPV6_MAXPLEN;
3525 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3526 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3527 ci.reachable_time = idev->nd_parms->reachable_time;
3528 ci.retrans_time = idev->nd_parms->retrans_time;
3529 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3531 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3533 goto nla_put_failure;
3534 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3536 /* XXX - MC not implemented */
3538 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3540 goto nla_put_failure;
3541 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3543 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3545 goto nla_put_failure;
3546 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3548 nla_nest_end(skb, protoinfo);
3549 return nlmsg_end(skb, nlh);
3552 nlmsg_cancel(skb, nlh);
3556 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3559 int s_idx = cb->args[0];
3560 struct net_device *dev;
3561 struct inet6_dev *idev;
3563 read_lock(&dev_base_lock);
3565 for_each_netdev(&init_net, dev) {
3568 if ((idev = in6_dev_get(dev)) == NULL)
3570 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3571 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3578 read_unlock(&dev_base_lock);
3584 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3586 struct sk_buff *skb;
3589 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
3593 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
3595 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3596 WARN_ON(err == -EMSGSIZE);
3600 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3603 rtnl_set_sk_err(RTNLGRP_IPV6_IFADDR, err);
3606 static inline size_t inet6_prefix_nlmsg_size(void)
3608 return NLMSG_ALIGN(sizeof(struct prefixmsg))
3609 + nla_total_size(sizeof(struct in6_addr))
3610 + nla_total_size(sizeof(struct prefix_cacheinfo));
3613 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3614 struct prefix_info *pinfo, u32 pid, u32 seq,
3615 int event, unsigned int flags)
3617 struct prefixmsg *pmsg;
3618 struct nlmsghdr *nlh;
3619 struct prefix_cacheinfo ci;
3621 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3625 pmsg = nlmsg_data(nlh);
3626 pmsg->prefix_family = AF_INET6;
3627 pmsg->prefix_pad1 = 0;
3628 pmsg->prefix_pad2 = 0;
3629 pmsg->prefix_ifindex = idev->dev->ifindex;
3630 pmsg->prefix_len = pinfo->prefix_len;
3631 pmsg->prefix_type = pinfo->type;
3632 pmsg->prefix_pad3 = 0;
3633 pmsg->prefix_flags = 0;
3635 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3636 if (pinfo->autoconf)
3637 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3639 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3641 ci.preferred_time = ntohl(pinfo->prefered);
3642 ci.valid_time = ntohl(pinfo->valid);
3643 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3645 return nlmsg_end(skb, nlh);
3648 nlmsg_cancel(skb, nlh);
3652 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3653 struct prefix_info *pinfo)
3655 struct sk_buff *skb;
3658 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
3662 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
3664 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3665 WARN_ON(err == -EMSGSIZE);
3669 err = rtnl_notify(skb, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3672 rtnl_set_sk_err(RTNLGRP_IPV6_PREFIX, err);
3675 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3677 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3682 * If the address was optimistic
3683 * we inserted the route at the start of
3684 * our DAD process, so we don't need
3687 if (!(ifp->rt->rt6i_node))
3688 ip6_ins_rt(ifp->rt);
3689 if (ifp->idev->cnf.forwarding)
3690 addrconf_join_anycast(ifp);
3693 if (ifp->idev->cnf.forwarding)
3694 addrconf_leave_anycast(ifp);
3695 addrconf_leave_solict(ifp->idev, &ifp->addr);
3696 dst_hold(&ifp->rt->u.dst);
3697 if (ip6_del_rt(ifp->rt))
3698 dst_free(&ifp->rt->u.dst);
3703 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3706 if (likely(ifp->idev->dead == 0))
3707 __ipv6_ifa_notify(event, ifp);
3708 rcu_read_unlock_bh();
3711 #ifdef CONFIG_SYSCTL
3714 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3715 void __user *buffer, size_t *lenp, loff_t *ppos)
3717 int *valp = ctl->data;
3721 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3723 if (write && valp != &ipv6_devconf_dflt.forwarding) {
3724 if (valp != &ipv6_devconf.forwarding) {
3725 if ((!*valp) ^ (!val)) {
3726 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
3729 dev_forward_change(idev);
3732 ipv6_devconf_dflt.forwarding = ipv6_devconf.forwarding;
3733 addrconf_forward_change();
3736 rt6_purge_dflt_routers();
3742 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3743 int __user *name, int nlen,
3744 void __user *oldval,
3745 size_t __user *oldlenp,
3746 void __user *newval, size_t newlen)
3748 int *valp = table->data;
3751 if (!newval || !newlen)
3753 if (newlen != sizeof(int))
3755 if (get_user(new, (int __user *)newval))
3759 if (oldval && oldlenp) {
3761 if (get_user(len, oldlenp))
3764 if (len > table->maxlen)
3765 len = table->maxlen;
3766 if (copy_to_user(oldval, valp, len))
3768 if (put_user(len, oldlenp))
3773 if (valp != &ipv6_devconf_dflt.forwarding) {
3774 if (valp != &ipv6_devconf.forwarding) {
3775 struct inet6_dev *idev = (struct inet6_dev *)table->extra1;
3777 if (unlikely(idev == NULL))
3779 changed = (!*valp) ^ (!new);
3782 dev_forward_change(idev);
3785 addrconf_forward_change();
3789 rt6_purge_dflt_routers();
3796 static struct addrconf_sysctl_table
3798 struct ctl_table_header *sysctl_header;
3799 ctl_table addrconf_vars[__NET_IPV6_MAX];
3800 ctl_table addrconf_dev[2];
3801 ctl_table addrconf_conf_dir[2];
3802 ctl_table addrconf_proto_dir[2];
3803 ctl_table addrconf_root_dir[2];
3804 } addrconf_sysctl __read_mostly = {
3805 .sysctl_header = NULL,
3808 .ctl_name = NET_IPV6_FORWARDING,
3809 .procname = "forwarding",
3810 .data = &ipv6_devconf.forwarding,
3811 .maxlen = sizeof(int),
3813 .proc_handler = &addrconf_sysctl_forward,
3814 .strategy = &addrconf_sysctl_forward_strategy,
3817 .ctl_name = NET_IPV6_HOP_LIMIT,
3818 .procname = "hop_limit",
3819 .data = &ipv6_devconf.hop_limit,
3820 .maxlen = sizeof(int),
3822 .proc_handler = proc_dointvec,
3825 .ctl_name = NET_IPV6_MTU,
3827 .data = &ipv6_devconf.mtu6,
3828 .maxlen = sizeof(int),
3830 .proc_handler = &proc_dointvec,
3833 .ctl_name = NET_IPV6_ACCEPT_RA,
3834 .procname = "accept_ra",
3835 .data = &ipv6_devconf.accept_ra,
3836 .maxlen = sizeof(int),
3838 .proc_handler = &proc_dointvec,
3841 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS,
3842 .procname = "accept_redirects",
3843 .data = &ipv6_devconf.accept_redirects,
3844 .maxlen = sizeof(int),
3846 .proc_handler = &proc_dointvec,
3849 .ctl_name = NET_IPV6_AUTOCONF,
3850 .procname = "autoconf",
3851 .data = &ipv6_devconf.autoconf,
3852 .maxlen = sizeof(int),
3854 .proc_handler = &proc_dointvec,
3857 .ctl_name = NET_IPV6_DAD_TRANSMITS,
3858 .procname = "dad_transmits",
3859 .data = &ipv6_devconf.dad_transmits,
3860 .maxlen = sizeof(int),
3862 .proc_handler = &proc_dointvec,
3865 .ctl_name = NET_IPV6_RTR_SOLICITS,
3866 .procname = "router_solicitations",
3867 .data = &ipv6_devconf.rtr_solicits,
3868 .maxlen = sizeof(int),
3870 .proc_handler = &proc_dointvec,
3873 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL,
3874 .procname = "router_solicitation_interval",
3875 .data = &ipv6_devconf.rtr_solicit_interval,
3876 .maxlen = sizeof(int),
3878 .proc_handler = &proc_dointvec_jiffies,
3879 .strategy = &sysctl_jiffies,
3882 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY,
3883 .procname = "router_solicitation_delay",
3884 .data = &ipv6_devconf.rtr_solicit_delay,
3885 .maxlen = sizeof(int),
3887 .proc_handler = &proc_dointvec_jiffies,
3888 .strategy = &sysctl_jiffies,
3891 .ctl_name = NET_IPV6_FORCE_MLD_VERSION,
3892 .procname = "force_mld_version",
3893 .data = &ipv6_devconf.force_mld_version,
3894 .maxlen = sizeof(int),
3896 .proc_handler = &proc_dointvec,
3898 #ifdef CONFIG_IPV6_PRIVACY
3900 .ctl_name = NET_IPV6_USE_TEMPADDR,
3901 .procname = "use_tempaddr",
3902 .data = &ipv6_devconf.use_tempaddr,
3903 .maxlen = sizeof(int),
3905 .proc_handler = &proc_dointvec,
3908 .ctl_name = NET_IPV6_TEMP_VALID_LFT,
3909 .procname = "temp_valid_lft",
3910 .data = &ipv6_devconf.temp_valid_lft,
3911 .maxlen = sizeof(int),
3913 .proc_handler = &proc_dointvec,
3916 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT,
3917 .procname = "temp_prefered_lft",
3918 .data = &ipv6_devconf.temp_prefered_lft,
3919 .maxlen = sizeof(int),
3921 .proc_handler = &proc_dointvec,
3924 .ctl_name = NET_IPV6_REGEN_MAX_RETRY,
3925 .procname = "regen_max_retry",
3926 .data = &ipv6_devconf.regen_max_retry,
3927 .maxlen = sizeof(int),
3929 .proc_handler = &proc_dointvec,
3932 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR,
3933 .procname = "max_desync_factor",
3934 .data = &ipv6_devconf.max_desync_factor,
3935 .maxlen = sizeof(int),
3937 .proc_handler = &proc_dointvec,
3941 .ctl_name = NET_IPV6_MAX_ADDRESSES,
3942 .procname = "max_addresses",
3943 .data = &ipv6_devconf.max_addresses,
3944 .maxlen = sizeof(int),
3946 .proc_handler = &proc_dointvec,
3949 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR,
3950 .procname = "accept_ra_defrtr",
3951 .data = &ipv6_devconf.accept_ra_defrtr,
3952 .maxlen = sizeof(int),
3954 .proc_handler = &proc_dointvec,
3957 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO,
3958 .procname = "accept_ra_pinfo",
3959 .data = &ipv6_devconf.accept_ra_pinfo,
3960 .maxlen = sizeof(int),
3962 .proc_handler = &proc_dointvec,
3964 #ifdef CONFIG_IPV6_ROUTER_PREF
3966 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF,
3967 .procname = "accept_ra_rtr_pref",
3968 .data = &ipv6_devconf.accept_ra_rtr_pref,
3969 .maxlen = sizeof(int),
3971 .proc_handler = &proc_dointvec,
3974 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL,
3975 .procname = "router_probe_interval",
3976 .data = &ipv6_devconf.rtr_probe_interval,
3977 .maxlen = sizeof(int),
3979 .proc_handler = &proc_dointvec_jiffies,
3980 .strategy = &sysctl_jiffies,
3982 #ifdef CONFIG_IPV6_ROUTE_INFO
3984 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
3985 .procname = "accept_ra_rt_info_max_plen",
3986 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
3987 .maxlen = sizeof(int),
3989 .proc_handler = &proc_dointvec,
3994 .ctl_name = NET_IPV6_PROXY_NDP,
3995 .procname = "proxy_ndp",
3996 .data = &ipv6_devconf.proxy_ndp,
3997 .maxlen = sizeof(int),
3999 .proc_handler = &proc_dointvec,
4002 .ctl_name = NET_IPV6_ACCEPT_SOURCE_ROUTE,
4003 .procname = "accept_source_route",
4004 .data = &ipv6_devconf.accept_source_route,
4005 .maxlen = sizeof(int),
4007 .proc_handler = &proc_dointvec,
4009 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4011 .ctl_name = CTL_UNNUMBERED,
4012 .procname = "optimistic_dad",
4013 .data = &ipv6_devconf.optimistic_dad,
4014 .maxlen = sizeof(int),
4016 .proc_handler = &proc_dointvec,
4021 .ctl_name = 0, /* sentinel */
4026 .ctl_name = NET_PROTO_CONF_ALL,
4029 .child = addrconf_sysctl.addrconf_vars,
4032 .ctl_name = 0, /* sentinel */
4035 .addrconf_conf_dir = {
4037 .ctl_name = NET_IPV6_CONF,
4040 .child = addrconf_sysctl.addrconf_dev,
4043 .ctl_name = 0, /* sentinel */
4046 .addrconf_proto_dir = {
4048 .ctl_name = NET_IPV6,
4051 .child = addrconf_sysctl.addrconf_conf_dir,
4054 .ctl_name = 0, /* sentinel */
4057 .addrconf_root_dir = {
4059 .ctl_name = CTL_NET,
4062 .child = addrconf_sysctl.addrconf_proto_dir,
4065 .ctl_name = 0, /* sentinel */
4070 static void addrconf_sysctl_register(struct inet6_dev *idev, struct ipv6_devconf *p)
4073 struct net_device *dev = idev ? idev->dev : NULL;
4074 struct addrconf_sysctl_table *t;
4075 char *dev_name = NULL;
4077 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4080 for (i=0; t->addrconf_vars[i].data; i++) {
4081 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
4082 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4085 dev_name = dev->name;
4086 t->addrconf_dev[0].ctl_name = dev->ifindex;
4088 dev_name = "default";
4089 t->addrconf_dev[0].ctl_name = NET_PROTO_CONF_DEFAULT;
4093 * Make a copy of dev_name, because '.procname' is regarded as const
4094 * by sysctl and we wouldn't want anyone to change it under our feet
4095 * (see SIOCSIFNAME).
4097 dev_name = kstrdup(dev_name, GFP_KERNEL);
4101 t->addrconf_dev[0].procname = dev_name;
4103 t->addrconf_dev[0].child = t->addrconf_vars;
4104 t->addrconf_conf_dir[0].child = t->addrconf_dev;
4105 t->addrconf_proto_dir[0].child = t->addrconf_conf_dir;
4106 t->addrconf_root_dir[0].child = t->addrconf_proto_dir;
4108 t->sysctl_header = register_sysctl_table(t->addrconf_root_dir);
4109 if (t->sysctl_header == NULL)
4124 static void addrconf_sysctl_unregister(struct ipv6_devconf *p)
4127 struct addrconf_sysctl_table *t = p->sysctl;
4129 unregister_sysctl_table(t->sysctl_header);
4130 kfree(t->addrconf_dev[0].procname);
4142 int register_inet6addr_notifier(struct notifier_block *nb)
4144 return atomic_notifier_chain_register(&inet6addr_chain, nb);
4147 EXPORT_SYMBOL(register_inet6addr_notifier);
4149 int unregister_inet6addr_notifier(struct notifier_block *nb)
4151 return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
4154 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4157 * Init / cleanup code
4160 int __init addrconf_init(void)
4164 if ((err = ipv6_addr_label_init()) < 0) {
4165 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n",
4170 /* The addrconf netdev notifier requires that loopback_dev
4171 * has it's ipv6 private information allocated and setup
4172 * before it can bring up and give link-local addresses
4173 * to other devices which are up.
4175 * Unfortunately, loopback_dev is not necessarily the first
4176 * entry in the global dev_base list of net devices. In fact,
4177 * it is likely to be the very last entry on that list.
4178 * So this causes the notifier registry below to try and
4179 * give link-local addresses to all devices besides loopback_dev
4180 * first, then loopback_dev, which cases all the non-loopback_dev
4181 * devices to fail to get a link-local address.
4183 * So, as a temporary fix, allocate the ipv6 structure for
4184 * loopback_dev first by hand.
4185 * Longer term, all of the dependencies ipv6 has upon the loopback
4186 * device and it being up should be removed.
4189 if (!ipv6_add_dev(init_net.loopback_dev))
4195 ip6_null_entry.u.dst.dev = init_net.loopback_dev;
4196 ip6_null_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
4197 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
4198 ip6_prohibit_entry.u.dst.dev = init_net.loopback_dev;
4199 ip6_prohibit_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
4200 ip6_blk_hole_entry.u.dst.dev = init_net.loopback_dev;
4201 ip6_blk_hole_entry.rt6i_idev = in6_dev_get(init_net.loopback_dev);
4204 register_netdevice_notifier(&ipv6_dev_notf);
4208 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4212 /* Only the first call to __rtnl_register can fail */
4213 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4214 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4215 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4216 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4217 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4219 ipv6_addr_label_rtnl_register();
4221 #ifdef CONFIG_SYSCTL
4222 addrconf_sysctl.sysctl_header =
4223 register_sysctl_table(addrconf_sysctl.addrconf_root_dir);
4224 addrconf_sysctl_register(NULL, &ipv6_devconf_dflt);
4229 unregister_netdevice_notifier(&ipv6_dev_notf);
4234 void __exit addrconf_cleanup(void)
4236 struct net_device *dev;
4237 struct inet6_ifaddr *ifa;
4240 unregister_netdevice_notifier(&ipv6_dev_notf);
4242 #ifdef CONFIG_SYSCTL
4243 addrconf_sysctl_unregister(&ipv6_devconf_dflt);
4244 addrconf_sysctl_unregister(&ipv6_devconf);
4253 for_each_netdev(&init_net, dev) {
4254 if (__in6_dev_get(dev) == NULL)
4256 addrconf_ifdown(dev, 1);
4258 addrconf_ifdown(init_net.loopback_dev, 2);
4264 write_lock_bh(&addrconf_hash_lock);
4265 for (i=0; i < IN6_ADDR_HSIZE; i++) {
4266 for (ifa=inet6_addr_lst[i]; ifa; ) {
4267 struct inet6_ifaddr *bifa;
4270 ifa = ifa->lst_next;
4271 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4272 /* Do not free it; something is wrong.
4273 Now we can investigate it with debugger.
4277 write_unlock_bh(&addrconf_hash_lock);
4279 del_timer(&addr_chk_timer);