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 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
25 * yoshfuji@USAGI : Fixed interval between DAD
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
41 #include <linux/errno.h>
42 #include <linux/types.h>
43 #include <linux/socket.h>
44 #include <linux/sockios.h>
45 #include <linux/net.h>
46 #include <linux/in6.h>
47 #include <linux/netdevice.h>
48 #include <linux/if_addr.h>
49 #include <linux/if_arp.h>
50 #include <linux/if_arcnet.h>
51 #include <linux/if_infiniband.h>
52 #include <linux/route.h>
53 #include <linux/inetdevice.h>
54 #include <linux/init.h>
56 #include <linux/sysctl.h>
58 #include <linux/capability.h>
59 #include <linux/delay.h>
60 #include <linux/notifier.h>
61 #include <linux/string.h>
63 #include <net/net_namespace.h>
68 #include <net/protocol.h>
69 #include <net/ndisc.h>
70 #include <net/ip6_route.h>
71 #include <net/addrconf.h>
74 #include <net/netlink.h>
75 #include <net/pkt_sched.h>
76 #include <linux/if_tunnel.h>
77 #include <linux/rtnetlink.h>
79 #ifdef CONFIG_IPV6_PRIVACY
80 #include <linux/random.h>
83 #include <asm/uaccess.h>
84 #include <asm/unaligned.h>
86 #include <linux/proc_fs.h>
87 #include <linux/seq_file.h>
89 /* Set to 3 to get tracing... */
93 #define ADBG(x) printk x
98 #define INFINITY_LIFE_TIME 0xFFFFFFFF
99 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
102 static void addrconf_sysctl_register(struct inet6_dev *idev);
103 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
105 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
109 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
114 #ifdef CONFIG_IPV6_PRIVACY
115 static int __ipv6_regen_rndid(struct inet6_dev *idev);
116 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
117 static void ipv6_regen_rndid(unsigned long data);
119 static int desync_factor = MAX_DESYNC_FACTOR * HZ;
122 static int ipv6_count_addresses(struct inet6_dev *idev);
125 * Configured unicast address hash table
127 static struct inet6_ifaddr *inet6_addr_lst[IN6_ADDR_HSIZE];
128 static DEFINE_RWLOCK(addrconf_hash_lock);
130 static void addrconf_verify(unsigned long);
132 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
133 static DEFINE_SPINLOCK(addrconf_verify_lock);
135 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
136 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
138 static int addrconf_ifdown(struct net_device *dev, int how);
140 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
141 static void addrconf_dad_timer(unsigned long data);
142 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
143 static void addrconf_dad_run(struct inet6_dev *idev);
144 static void addrconf_rs_timer(unsigned long data);
145 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
146 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
148 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
149 struct prefix_info *pinfo);
150 static int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
151 struct net_device *dev);
153 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
155 struct ipv6_devconf ipv6_devconf __read_mostly = {
157 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
158 .mtu6 = IPV6_MIN_MTU,
160 .accept_redirects = 1,
162 .force_mld_version = 0,
164 .rtr_solicits = MAX_RTR_SOLICITATIONS,
165 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
166 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
167 #ifdef CONFIG_IPV6_PRIVACY
169 .temp_valid_lft = TEMP_VALID_LIFETIME,
170 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
171 .regen_max_retry = REGEN_MAX_RETRY,
172 .max_desync_factor = MAX_DESYNC_FACTOR,
174 .max_addresses = IPV6_MAX_ADDRESSES,
175 .accept_ra_defrtr = 1,
176 .accept_ra_pinfo = 1,
177 #ifdef CONFIG_IPV6_ROUTER_PREF
178 .accept_ra_rtr_pref = 1,
179 .rtr_probe_interval = 60 * HZ,
180 #ifdef CONFIG_IPV6_ROUTE_INFO
181 .accept_ra_rt_info_max_plen = 0,
185 .accept_source_route = 0, /* we do not accept RH0 by default. */
188 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
190 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
191 .mtu6 = IPV6_MIN_MTU,
193 .accept_redirects = 1,
196 .rtr_solicits = MAX_RTR_SOLICITATIONS,
197 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
198 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
199 #ifdef CONFIG_IPV6_PRIVACY
201 .temp_valid_lft = TEMP_VALID_LIFETIME,
202 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
203 .regen_max_retry = REGEN_MAX_RETRY,
204 .max_desync_factor = MAX_DESYNC_FACTOR,
206 .max_addresses = IPV6_MAX_ADDRESSES,
207 .accept_ra_defrtr = 1,
208 .accept_ra_pinfo = 1,
209 #ifdef CONFIG_IPV6_ROUTER_PREF
210 .accept_ra_rtr_pref = 1,
211 .rtr_probe_interval = 60 * HZ,
212 #ifdef CONFIG_IPV6_ROUTE_INFO
213 .accept_ra_rt_info_max_plen = 0,
217 .accept_source_route = 0, /* we do not accept RH0 by default. */
220 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
221 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
222 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
223 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
224 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
226 /* Check if a valid qdisc is available */
227 static inline int addrconf_qdisc_ok(struct net_device *dev)
229 return (dev->qdisc != &noop_qdisc);
232 /* Check if a route is valid prefix route */
233 static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
235 return ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0);
238 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
240 if (del_timer(&ifp->timer))
244 enum addrconf_timer_t
251 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
252 enum addrconf_timer_t what,
255 if (!del_timer(&ifp->timer))
260 ifp->timer.function = addrconf_dad_timer;
263 ifp->timer.function = addrconf_rs_timer;
267 ifp->timer.expires = jiffies + when;
268 add_timer(&ifp->timer);
271 static int snmp6_alloc_dev(struct inet6_dev *idev)
273 if (snmp_mib_init((void **)idev->stats.ipv6,
274 sizeof(struct ipstats_mib)) < 0)
276 if (snmp_mib_init((void **)idev->stats.icmpv6,
277 sizeof(struct icmpv6_mib)) < 0)
279 if (snmp_mib_init((void **)idev->stats.icmpv6msg,
280 sizeof(struct icmpv6msg_mib)) < 0)
286 snmp_mib_free((void **)idev->stats.icmpv6);
288 snmp_mib_free((void **)idev->stats.ipv6);
293 static void snmp6_free_dev(struct inet6_dev *idev)
295 snmp_mib_free((void **)idev->stats.icmpv6msg);
296 snmp_mib_free((void **)idev->stats.icmpv6);
297 snmp_mib_free((void **)idev->stats.ipv6);
300 /* Nobody refers to this device, we may destroy it. */
302 static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
304 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
308 void in6_dev_finish_destroy(struct inet6_dev *idev)
310 struct net_device *dev = idev->dev;
311 BUG_TRAP(idev->addr_list==NULL);
312 BUG_TRAP(idev->mc_list==NULL);
313 #ifdef NET_REFCNT_DEBUG
314 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
318 printk("Freeing alive inet6 device %p\n", idev);
321 snmp6_free_dev(idev);
322 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
325 EXPORT_SYMBOL(in6_dev_finish_destroy);
327 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
329 struct inet6_dev *ndev;
333 if (dev->mtu < IPV6_MIN_MTU)
336 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
341 rwlock_init(&ndev->lock);
343 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
344 ndev->cnf.mtu6 = dev->mtu;
345 ndev->cnf.sysctl = NULL;
346 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
347 if (ndev->nd_parms == NULL) {
351 /* We refer to the device */
354 if (snmp6_alloc_dev(ndev) < 0) {
356 "%s(): cannot allocate memory for statistics; dev=%s.\n",
357 __func__, dev->name));
358 neigh_parms_release(&nd_tbl, ndev->nd_parms);
360 in6_dev_finish_destroy(ndev);
364 if (snmp6_register_dev(ndev) < 0) {
366 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
367 __func__, dev->name));
368 neigh_parms_release(&nd_tbl, ndev->nd_parms);
370 in6_dev_finish_destroy(ndev);
374 /* One reference from device. We must do this before
375 * we invoke __ipv6_regen_rndid().
379 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
380 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
382 "%s: Disabled Multicast RS\n",
384 ndev->cnf.rtr_solicits = 0;
388 #ifdef CONFIG_IPV6_PRIVACY
389 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
390 if ((dev->flags&IFF_LOOPBACK) ||
391 dev->type == ARPHRD_TUNNEL ||
392 dev->type == ARPHRD_TUNNEL6 ||
393 dev->type == ARPHRD_SIT ||
394 dev->type == ARPHRD_NONE) {
396 "%s: Disabled Privacy Extensions\n",
398 ndev->cnf.use_tempaddr = -1;
401 ipv6_regen_rndid((unsigned long) ndev);
405 if (netif_running(dev) && addrconf_qdisc_ok(dev))
406 ndev->if_flags |= IF_READY;
408 ipv6_mc_init_dev(ndev);
409 ndev->tstamp = jiffies;
410 addrconf_sysctl_register(ndev);
411 /* protected by rtnl_lock */
412 rcu_assign_pointer(dev->ip6_ptr, ndev);
414 /* Join all-node multicast group */
415 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
420 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
422 struct inet6_dev *idev;
426 if ((idev = __in6_dev_get(dev)) == NULL) {
427 if ((idev = ipv6_add_dev(dev)) == NULL)
431 if (dev->flags&IFF_UP)
437 static void dev_forward_change(struct inet6_dev *idev)
439 struct net_device *dev;
440 struct inet6_ifaddr *ifa;
445 if (dev && (dev->flags & IFF_MULTICAST)) {
446 if (idev->cnf.forwarding)
447 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
449 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
451 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
452 if (ifa->flags&IFA_F_TENTATIVE)
454 if (idev->cnf.forwarding)
455 addrconf_join_anycast(ifa);
457 addrconf_leave_anycast(ifa);
462 static void addrconf_forward_change(struct net *net, __s32 newf)
464 struct net_device *dev;
465 struct inet6_dev *idev;
467 read_lock(&dev_base_lock);
468 for_each_netdev(net, dev) {
470 idev = __in6_dev_get(dev);
472 int changed = (!idev->cnf.forwarding) ^ (!newf);
473 idev->cnf.forwarding = newf;
475 dev_forward_change(idev);
479 read_unlock(&dev_base_lock);
482 static void addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
486 net = (struct net *)table->extra2;
487 if (p == &net->ipv6.devconf_dflt->forwarding)
490 if (p == &net->ipv6.devconf_all->forwarding) {
491 __s32 newf = net->ipv6.devconf_all->forwarding;
492 net->ipv6.devconf_dflt->forwarding = newf;
493 addrconf_forward_change(net, newf);
494 } else if ((!*p) ^ (!old))
495 dev_forward_change((struct inet6_dev *)table->extra1);
498 rt6_purge_dflt_routers(net);
502 /* Nobody refers to this ifaddr, destroy it */
504 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
506 BUG_TRAP(ifp->if_next==NULL);
507 BUG_TRAP(ifp->lst_next==NULL);
508 #ifdef NET_REFCNT_DEBUG
509 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
512 in6_dev_put(ifp->idev);
514 if (del_timer(&ifp->timer))
515 printk("Timer is still running, when freeing ifa=%p\n", ifp);
518 printk("Freeing alive inet6 address %p\n", ifp);
521 dst_release(&ifp->rt->u.dst);
527 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
529 struct inet6_ifaddr *ifa, **ifap;
530 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
533 * Each device address list is sorted in order of scope -
534 * global before linklocal.
536 for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
537 ifap = &ifa->if_next) {
538 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
542 ifp->if_next = *ifap;
547 * Hash function taken from net_alias.c
549 static u8 ipv6_addr_hash(const struct in6_addr *addr)
554 * We perform the hash function over the last 64 bits of the address
555 * This will include the IEEE address token on links that support it.
558 word = (__force u32)(addr->s6_addr32[2] ^ addr->s6_addr32[3]);
559 word ^= (word >> 16);
562 return ((word ^ (word >> 4)) & 0x0f);
565 /* On success it returns ifp with increased reference count */
567 static struct inet6_ifaddr *
568 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
569 int scope, u32 flags)
571 struct inet6_ifaddr *ifa = NULL;
578 err = -ENODEV; /*XXX*/
582 write_lock(&addrconf_hash_lock);
584 /* Ignore adding duplicate addresses on an interface */
585 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
586 ADBG(("ipv6_add_addr: already assigned\n"));
591 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
594 ADBG(("ipv6_add_addr: malloc failed\n"));
599 rt = addrconf_dst_alloc(idev, addr, 0);
605 ipv6_addr_copy(&ifa->addr, addr);
607 spin_lock_init(&ifa->lock);
608 init_timer(&ifa->timer);
609 ifa->timer.data = (unsigned long) ifa;
611 ifa->prefix_len = pfxlen;
612 ifa->flags = flags | IFA_F_TENTATIVE;
613 ifa->cstamp = ifa->tstamp = jiffies;
618 * part one of RFC 4429, section 3.3
619 * We should not configure an address as
620 * optimistic if we do not yet know the link
621 * layer address of our nexhop router
624 if (rt->rt6i_nexthop == NULL)
625 ifa->flags &= ~IFA_F_OPTIMISTIC;
632 /* Add to big hash table */
633 hash = ipv6_addr_hash(addr);
635 ifa->lst_next = inet6_addr_lst[hash];
636 inet6_addr_lst[hash] = ifa;
638 write_unlock(&addrconf_hash_lock);
640 write_lock(&idev->lock);
641 /* Add to inet6_dev unicast addr list. */
642 ipv6_link_dev_addr(idev, ifa);
644 #ifdef CONFIG_IPV6_PRIVACY
645 if (ifa->flags&IFA_F_TEMPORARY) {
646 ifa->tmp_next = idev->tempaddr_list;
647 idev->tempaddr_list = ifa;
653 write_unlock(&idev->lock);
655 rcu_read_unlock_bh();
657 if (likely(err == 0))
658 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
666 write_unlock(&addrconf_hash_lock);
670 /* This function wants to get referenced ifp and releases it before return */
672 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
674 struct inet6_ifaddr *ifa, **ifap;
675 struct inet6_dev *idev = ifp->idev;
677 int deleted = 0, onlink = 0;
678 unsigned long expires = jiffies;
680 hash = ipv6_addr_hash(&ifp->addr);
684 write_lock_bh(&addrconf_hash_lock);
685 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
686 ifap = &ifa->lst_next) {
688 *ifap = ifa->lst_next;
690 ifa->lst_next = NULL;
694 write_unlock_bh(&addrconf_hash_lock);
696 write_lock_bh(&idev->lock);
697 #ifdef CONFIG_IPV6_PRIVACY
698 if (ifp->flags&IFA_F_TEMPORARY) {
699 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
700 ifap = &ifa->tmp_next) {
702 *ifap = ifa->tmp_next;
704 in6_ifa_put(ifp->ifpub);
708 ifa->tmp_next = NULL;
715 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
717 *ifap = ifa->if_next;
720 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
724 } else if (ifp->flags & IFA_F_PERMANENT) {
725 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
727 if (ifa->flags & IFA_F_PERMANENT) {
732 unsigned long lifetime;
737 spin_lock(&ifa->lock);
739 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
741 * Note: Because this address is
742 * not permanent, lifetime <
743 * LONG_MAX / HZ here.
745 if (time_before(expires,
746 ifa->tstamp + lifetime * HZ))
747 expires = ifa->tstamp + lifetime * HZ;
748 spin_unlock(&ifa->lock);
752 ifap = &ifa->if_next;
754 write_unlock_bh(&idev->lock);
756 ipv6_ifa_notify(RTM_DELADDR, ifp);
758 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
760 addrconf_del_timer(ifp);
763 * Purge or update corresponding prefix
765 * 1) we don't purge prefix here if address was not permanent.
766 * prefix is managed by its own lifetime.
767 * 2) if there're no addresses, delete prefix.
768 * 3) if there're still other permanent address(es),
769 * corresponding prefix is still permanent.
770 * 4) otherwise, update prefix lifetime to the
771 * longest valid lifetime among the corresponding
772 * addresses on the device.
773 * Note: subsequent RA will update lifetime.
777 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
778 struct in6_addr prefix;
780 struct net *net = dev_net(ifp->idev->dev);
781 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
782 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
784 if (rt && addrconf_is_prefix_route(rt)) {
788 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
789 rt->rt6i_expires = expires;
790 rt->rt6i_flags |= RTF_EXPIRES;
793 dst_release(&rt->u.dst);
799 #ifdef CONFIG_IPV6_PRIVACY
800 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
802 struct inet6_dev *idev = ifp->idev;
803 struct in6_addr addr, *tmpaddr;
804 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
805 unsigned long regen_advance;
811 write_lock(&idev->lock);
813 spin_lock_bh(&ift->lock);
814 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
815 spin_unlock_bh(&ift->lock);
822 if (idev->cnf.use_tempaddr <= 0) {
823 write_unlock(&idev->lock);
825 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
830 spin_lock_bh(&ifp->lock);
831 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
832 idev->cnf.use_tempaddr = -1; /*XXX*/
833 spin_unlock_bh(&ifp->lock);
834 write_unlock(&idev->lock);
836 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
842 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
843 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
844 spin_unlock_bh(&ifp->lock);
845 write_unlock(&idev->lock);
847 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
853 memcpy(&addr.s6_addr[8], idev->rndid, 8);
854 tmp_valid_lft = min_t(__u32,
856 idev->cnf.temp_valid_lft);
857 tmp_prefered_lft = min_t(__u32,
859 idev->cnf.temp_prefered_lft - desync_factor / HZ);
860 tmp_plen = ifp->prefix_len;
861 max_addresses = idev->cnf.max_addresses;
862 tmp_cstamp = ifp->cstamp;
863 tmp_tstamp = ifp->tstamp;
864 spin_unlock_bh(&ifp->lock);
866 regen_advance = idev->cnf.regen_max_retry *
867 idev->cnf.dad_transmits *
868 idev->nd_parms->retrans_time / HZ;
869 write_unlock(&idev->lock);
871 /* A temporary address is created only if this calculated Preferred
872 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
873 * an implementation must not create a temporary address with a zero
874 * Preferred Lifetime.
876 if (tmp_prefered_lft <= regen_advance) {
883 addr_flags = IFA_F_TEMPORARY;
884 /* set in addrconf_prefix_rcv() */
885 if (ifp->flags & IFA_F_OPTIMISTIC)
886 addr_flags |= IFA_F_OPTIMISTIC;
888 ift = !max_addresses ||
889 ipv6_count_addresses(idev) < max_addresses ?
890 ipv6_add_addr(idev, &addr, tmp_plen,
891 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
893 if (!ift || IS_ERR(ift)) {
897 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
899 write_lock(&idev->lock);
903 spin_lock_bh(&ift->lock);
905 ift->valid_lft = tmp_valid_lft;
906 ift->prefered_lft = tmp_prefered_lft;
907 ift->cstamp = tmp_cstamp;
908 ift->tstamp = tmp_tstamp;
909 spin_unlock_bh(&ift->lock);
911 addrconf_dad_start(ift, 0);
920 * Choose an appropriate source address (RFC3484)
923 IPV6_SADDR_RULE_INIT = 0,
924 IPV6_SADDR_RULE_LOCAL,
925 IPV6_SADDR_RULE_SCOPE,
926 IPV6_SADDR_RULE_PREFERRED,
927 #ifdef CONFIG_IPV6_MIP6
931 IPV6_SADDR_RULE_LABEL,
932 #ifdef CONFIG_IPV6_PRIVACY
933 IPV6_SADDR_RULE_PRIVACY,
935 IPV6_SADDR_RULE_ORCHID,
936 IPV6_SADDR_RULE_PREFIX,
940 struct ipv6_saddr_score {
943 struct inet6_ifaddr *ifa;
944 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
949 struct ipv6_saddr_dst {
950 const struct in6_addr *addr;
957 static inline int ipv6_saddr_preferred(int type)
959 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
960 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
965 static int ipv6_get_saddr_eval(struct net *net,
966 struct ipv6_saddr_score *score,
967 struct ipv6_saddr_dst *dst,
972 if (i <= score->rule) {
974 case IPV6_SADDR_RULE_SCOPE:
975 ret = score->scopedist;
977 case IPV6_SADDR_RULE_PREFIX:
978 ret = score->matchlen;
981 ret = !!test_bit(i, score->scorebits);
987 case IPV6_SADDR_RULE_INIT:
988 /* Rule 0: remember if hiscore is not ready yet */
991 case IPV6_SADDR_RULE_LOCAL:
992 /* Rule 1: Prefer same address */
993 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
995 case IPV6_SADDR_RULE_SCOPE:
996 /* Rule 2: Prefer appropriate scope
1001 * ---+--+-+---> scope
1003 * | d is scope of the destination.
1005 * | \ <- smaller scope is better if
1006 * B-15 | \ if scope is enough for destinaion.
1007 * | ret = B - scope (-1 <= scope >= d <= 15).
1009 * |/ <- greater is better
1010 * -C / if scope is not enough for destination.
1011 * /| ret = scope - C (-1 <= d < scope <= 15).
1013 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1014 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1015 * Assume B = 0 and we get C > 29.
1017 ret = __ipv6_addr_src_scope(score->addr_type);
1018 if (ret >= dst->scope)
1021 ret -= 128; /* 30 is enough */
1022 score->scopedist = ret;
1024 case IPV6_SADDR_RULE_PREFERRED:
1025 /* Rule 3: Avoid deprecated and optimistic addresses */
1026 ret = ipv6_saddr_preferred(score->addr_type) ||
1027 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1029 #ifdef CONFIG_IPV6_MIP6
1030 case IPV6_SADDR_RULE_HOA:
1032 /* Rule 4: Prefer home address */
1033 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1034 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1038 case IPV6_SADDR_RULE_OIF:
1039 /* Rule 5: Prefer outgoing interface */
1040 ret = (!dst->ifindex ||
1041 dst->ifindex == score->ifa->idev->dev->ifindex);
1043 case IPV6_SADDR_RULE_LABEL:
1044 /* Rule 6: Prefer matching label */
1045 ret = ipv6_addr_label(net,
1046 &score->ifa->addr, score->addr_type,
1047 score->ifa->idev->dev->ifindex) == dst->label;
1049 #ifdef CONFIG_IPV6_PRIVACY
1050 case IPV6_SADDR_RULE_PRIVACY:
1052 /* Rule 7: Prefer public address
1053 * Note: prefer temprary address if use_tempaddr >= 2
1055 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1056 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1057 score->ifa->idev->cnf.use_tempaddr >= 2;
1058 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1062 case IPV6_SADDR_RULE_ORCHID:
1063 /* Rule 8-: Prefer ORCHID vs ORCHID or
1064 * non-ORCHID vs non-ORCHID
1066 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1067 ipv6_addr_orchid(dst->addr));
1069 case IPV6_SADDR_RULE_PREFIX:
1070 /* Rule 8: Use longest matching prefix */
1071 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1079 __set_bit(i, score->scorebits);
1085 int ipv6_dev_get_saddr(struct net_device *dst_dev,
1086 const struct in6_addr *daddr, unsigned int prefs,
1087 struct in6_addr *saddr)
1089 struct ipv6_saddr_score scores[2],
1090 *score = &scores[0], *hiscore = &scores[1];
1091 struct net *net = dev_net(dst_dev);
1092 struct ipv6_saddr_dst dst;
1093 struct net_device *dev;
1096 dst_type = __ipv6_addr_type(daddr);
1098 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1099 dst.scope = __ipv6_addr_src_scope(dst_type);
1100 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1104 hiscore->ifa = NULL;
1106 read_lock(&dev_base_lock);
1109 for_each_netdev(net, dev) {
1110 struct inet6_dev *idev;
1112 /* Candidate Source Address (section 4)
1113 * - multicast and link-local destination address,
1114 * the set of candidate source address MUST only
1115 * include addresses assigned to interfaces
1116 * belonging to the same link as the outgoing
1118 * (- For site-local destination addresses, the
1119 * set of candidate source addresses MUST only
1120 * include addresses assigned to interfaces
1121 * belonging to the same site as the outgoing
1124 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1125 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1126 dst.ifindex && dev->ifindex != dst.ifindex)
1129 idev = __in6_dev_get(dev);
1133 read_lock_bh(&idev->lock);
1134 for (score->ifa = idev->addr_list; score->ifa; score->ifa = score->ifa->if_next) {
1138 * - Tentative Address (RFC2462 section 5.4)
1139 * - A tentative address is not considered
1140 * "assigned to an interface" in the traditional
1141 * sense, unless it is also flagged as optimistic.
1142 * - Candidate Source Address (section 4)
1143 * - In any case, anycast addresses, multicast
1144 * addresses, and the unspecified address MUST
1145 * NOT be included in a candidate set.
1147 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1148 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1151 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1153 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1154 score->addr_type & IPV6_ADDR_MULTICAST)) {
1155 LIMIT_NETDEBUG(KERN_DEBUG
1156 "ADDRCONF: unspecified / multicast address "
1157 "assigned as unicast address on %s",
1163 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1165 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1166 int minihiscore, miniscore;
1168 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1169 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1171 if (minihiscore > miniscore) {
1172 if (i == IPV6_SADDR_RULE_SCOPE &&
1173 score->scopedist > 0) {
1176 * each remaining entry
1177 * has too small (not enough)
1178 * scope, because ifa entries
1179 * are sorted by their scope
1185 } else if (minihiscore < miniscore) {
1186 struct ipv6_saddr_score *tmp;
1189 in6_ifa_put(hiscore->ifa);
1191 in6_ifa_hold(score->ifa);
1197 /* restore our iterator */
1198 score->ifa = hiscore->ifa;
1205 read_unlock_bh(&idev->lock);
1208 read_unlock(&dev_base_lock);
1211 return -EADDRNOTAVAIL;
1213 ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1214 in6_ifa_put(hiscore->ifa);
1218 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1220 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1221 unsigned char banned_flags)
1223 struct inet6_dev *idev;
1224 int err = -EADDRNOTAVAIL;
1227 if ((idev = __in6_dev_get(dev)) != NULL) {
1228 struct inet6_ifaddr *ifp;
1230 read_lock_bh(&idev->lock);
1231 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1232 if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1233 ipv6_addr_copy(addr, &ifp->addr);
1238 read_unlock_bh(&idev->lock);
1244 static int ipv6_count_addresses(struct inet6_dev *idev)
1247 struct inet6_ifaddr *ifp;
1249 read_lock_bh(&idev->lock);
1250 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1252 read_unlock_bh(&idev->lock);
1256 int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1257 struct net_device *dev, int strict)
1259 struct inet6_ifaddr * ifp;
1260 u8 hash = ipv6_addr_hash(addr);
1262 read_lock_bh(&addrconf_hash_lock);
1263 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1264 if (!net_eq(dev_net(ifp->idev->dev), net))
1266 if (ipv6_addr_equal(&ifp->addr, addr) &&
1267 !(ifp->flags&IFA_F_TENTATIVE)) {
1268 if (dev == NULL || ifp->idev->dev == dev ||
1269 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1273 read_unlock_bh(&addrconf_hash_lock);
1276 EXPORT_SYMBOL(ipv6_chk_addr);
1279 int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1280 struct net_device *dev)
1282 struct inet6_ifaddr * ifp;
1283 u8 hash = ipv6_addr_hash(addr);
1285 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1286 if (!net_eq(dev_net(ifp->idev->dev), net))
1288 if (ipv6_addr_equal(&ifp->addr, addr)) {
1289 if (dev == NULL || ifp->idev->dev == dev)
1296 int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev)
1298 struct inet6_dev *idev;
1299 struct inet6_ifaddr *ifa;
1304 idev = __in6_dev_get(dev);
1306 read_lock_bh(&idev->lock);
1307 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
1308 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1313 read_unlock_bh(&idev->lock);
1319 EXPORT_SYMBOL(ipv6_chk_prefix);
1321 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1322 struct net_device *dev, int strict)
1324 struct inet6_ifaddr * ifp;
1325 u8 hash = ipv6_addr_hash(addr);
1327 read_lock_bh(&addrconf_hash_lock);
1328 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1329 if (!net_eq(dev_net(ifp->idev->dev), net))
1331 if (ipv6_addr_equal(&ifp->addr, addr)) {
1332 if (dev == NULL || ifp->idev->dev == dev ||
1333 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1339 read_unlock_bh(&addrconf_hash_lock);
1344 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1346 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1347 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
1348 __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1349 __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1350 int sk_ipv6only = ipv6_only_sock(sk);
1351 int sk2_ipv6only = inet_v6_ipv6only(sk2);
1352 int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1353 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1355 if (!sk2_rcv_saddr && !sk_ipv6only)
1358 if (addr_type2 == IPV6_ADDR_ANY &&
1359 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1362 if (addr_type == IPV6_ADDR_ANY &&
1363 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1366 if (sk2_rcv_saddr6 &&
1367 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1370 if (addr_type == IPV6_ADDR_MAPPED &&
1372 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1378 /* Gets referenced address, destroys ifaddr */
1380 static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1382 if (ifp->flags&IFA_F_PERMANENT) {
1383 spin_lock_bh(&ifp->lock);
1384 addrconf_del_timer(ifp);
1385 ifp->flags |= IFA_F_TENTATIVE;
1386 spin_unlock_bh(&ifp->lock);
1388 #ifdef CONFIG_IPV6_PRIVACY
1389 } else if (ifp->flags&IFA_F_TEMPORARY) {
1390 struct inet6_ifaddr *ifpub;
1391 spin_lock_bh(&ifp->lock);
1394 in6_ifa_hold(ifpub);
1395 spin_unlock_bh(&ifp->lock);
1396 ipv6_create_tempaddr(ifpub, ifp);
1399 spin_unlock_bh(&ifp->lock);
1407 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1409 if (net_ratelimit())
1410 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1411 addrconf_dad_stop(ifp);
1414 /* Join to solicited addr multicast group. */
1416 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1418 struct in6_addr maddr;
1420 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1423 addrconf_addr_solict_mult(addr, &maddr);
1424 ipv6_dev_mc_inc(dev, &maddr);
1427 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1429 struct in6_addr maddr;
1431 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1434 addrconf_addr_solict_mult(addr, &maddr);
1435 __ipv6_dev_mc_dec(idev, &maddr);
1438 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1440 struct in6_addr addr;
1441 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1442 if (ipv6_addr_any(&addr))
1444 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1447 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1449 struct in6_addr addr;
1450 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1451 if (ipv6_addr_any(&addr))
1453 __ipv6_dev_ac_dec(ifp->idev, &addr);
1456 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1458 if (dev->addr_len != ETH_ALEN)
1460 memcpy(eui, dev->dev_addr, 3);
1461 memcpy(eui + 5, dev->dev_addr + 3, 3);
1464 * The zSeries OSA network cards can be shared among various
1465 * OS instances, but the OSA cards have only one MAC address.
1466 * This leads to duplicate address conflicts in conjunction
1467 * with IPv6 if more than one instance uses the same card.
1469 * The driver for these cards can deliver a unique 16-bit
1470 * identifier for each instance sharing the same card. It is
1471 * placed instead of 0xFFFE in the interface identifier. The
1472 * "u" bit of the interface identifier is not inverted in this
1473 * case. Hence the resulting interface identifier has local
1474 * scope according to RFC2373.
1477 eui[3] = (dev->dev_id >> 8) & 0xFF;
1478 eui[4] = dev->dev_id & 0xFF;
1487 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1489 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1490 if (dev->addr_len != ARCNET_ALEN)
1493 eui[7] = *(u8*)dev->dev_addr;
1497 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1499 if (dev->addr_len != INFINIBAND_ALEN)
1501 memcpy(eui, dev->dev_addr + 12, 8);
1506 int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1508 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1509 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1510 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1511 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1512 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1513 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1517 memcpy(eui + 4, &addr, 4);
1520 EXPORT_SYMBOL(__ipv6_isatap_ifid);
1522 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1524 if (dev->priv_flags & IFF_ISATAP)
1525 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1529 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1531 switch (dev->type) {
1534 case ARPHRD_IEEE802_TR:
1535 return addrconf_ifid_eui48(eui, dev);
1537 return addrconf_ifid_arcnet(eui, dev);
1538 case ARPHRD_INFINIBAND:
1539 return addrconf_ifid_infiniband(eui, dev);
1541 return addrconf_ifid_sit(eui, dev);
1546 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1549 struct inet6_ifaddr *ifp;
1551 read_lock_bh(&idev->lock);
1552 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1553 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1554 memcpy(eui, ifp->addr.s6_addr+8, 8);
1559 read_unlock_bh(&idev->lock);
1563 #ifdef CONFIG_IPV6_PRIVACY
1564 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1565 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1568 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1569 idev->rndid[0] &= ~0x02;
1572 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1573 * check if generated address is not inappropriate
1575 * - Reserved subnet anycast (RFC 2526)
1576 * 11111101 11....11 1xxxxxxx
1577 * - ISATAP (RFC4214) 6.1
1578 * 00-00-5E-FE-xx-xx-xx-xx
1580 * - XXX: already assigned to an address on the device
1582 if (idev->rndid[0] == 0xfd &&
1583 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1584 (idev->rndid[7]&0x80))
1586 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1587 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1589 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1596 static void ipv6_regen_rndid(unsigned long data)
1598 struct inet6_dev *idev = (struct inet6_dev *) data;
1599 unsigned long expires;
1602 write_lock_bh(&idev->lock);
1607 if (__ipv6_regen_rndid(idev) < 0)
1611 idev->cnf.temp_prefered_lft * HZ -
1612 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1613 if (time_before(expires, jiffies)) {
1615 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1620 if (!mod_timer(&idev->regen_timer, expires))
1624 write_unlock_bh(&idev->lock);
1625 rcu_read_unlock_bh();
1629 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1632 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1633 ret = __ipv6_regen_rndid(idev);
1643 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1644 unsigned long expires, u32 flags)
1646 struct fib6_config cfg = {
1647 .fc_table = RT6_TABLE_PREFIX,
1648 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1649 .fc_ifindex = dev->ifindex,
1650 .fc_expires = expires,
1652 .fc_flags = RTF_UP | flags,
1653 .fc_nlinfo.nl_net = dev_net(dev),
1656 ipv6_addr_copy(&cfg.fc_dst, pfx);
1658 /* Prevent useless cloning on PtP SIT.
1659 This thing is done here expecting that the whole
1660 class of non-broadcast devices need not cloning.
1662 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1663 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1664 cfg.fc_flags |= RTF_NONEXTHOP;
1667 ip6_route_add(&cfg);
1670 /* Create "default" multicast route to the interface */
1672 static void addrconf_add_mroute(struct net_device *dev)
1674 struct fib6_config cfg = {
1675 .fc_table = RT6_TABLE_LOCAL,
1676 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1677 .fc_ifindex = dev->ifindex,
1680 .fc_nlinfo.nl_net = dev_net(dev),
1683 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1685 ip6_route_add(&cfg);
1688 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1689 static void sit_route_add(struct net_device *dev)
1691 struct fib6_config cfg = {
1692 .fc_table = RT6_TABLE_MAIN,
1693 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1694 .fc_ifindex = dev->ifindex,
1696 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1697 .fc_nlinfo.nl_net = dev_net(dev),
1700 /* prefix length - 96 bits "::d.d.d.d" */
1701 ip6_route_add(&cfg);
1705 static void addrconf_add_lroute(struct net_device *dev)
1707 struct in6_addr addr;
1709 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1710 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1713 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1715 struct inet6_dev *idev;
1719 if ((idev = ipv6_find_idev(dev)) == NULL)
1722 /* Add default multicast route */
1723 addrconf_add_mroute(dev);
1725 /* Add link local route */
1726 addrconf_add_lroute(dev);
1730 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1732 struct prefix_info *pinfo;
1736 struct inet6_dev *in6_dev;
1738 pinfo = (struct prefix_info *) opt;
1740 if (len < sizeof(struct prefix_info)) {
1741 ADBG(("addrconf: prefix option too short\n"));
1746 * Validation checks ([ADDRCONF], page 19)
1749 addr_type = ipv6_addr_type(&pinfo->prefix);
1751 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1754 valid_lft = ntohl(pinfo->valid);
1755 prefered_lft = ntohl(pinfo->prefered);
1757 if (prefered_lft > valid_lft) {
1758 if (net_ratelimit())
1759 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1763 in6_dev = in6_dev_get(dev);
1765 if (in6_dev == NULL) {
1766 if (net_ratelimit())
1767 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1772 * Two things going on here:
1773 * 1) Add routes for on-link prefixes
1774 * 2) Configure prefixes with the auto flag set
1777 if (pinfo->onlink) {
1778 struct rt6_info *rt;
1779 unsigned long rt_expires;
1781 /* Avoid arithmetic overflow. Really, we could
1782 * save rt_expires in seconds, likely valid_lft,
1783 * but it would require division in fib gc, that it
1787 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1789 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
1791 if (addrconf_finite_timeout(rt_expires))
1794 rt = rt6_lookup(dev_net(dev), &pinfo->prefix, NULL,
1797 if (rt && addrconf_is_prefix_route(rt)) {
1798 /* Autoconf prefix route */
1799 if (valid_lft == 0) {
1802 } else if (addrconf_finite_timeout(rt_expires)) {
1804 rt->rt6i_expires = jiffies + rt_expires;
1805 rt->rt6i_flags |= RTF_EXPIRES;
1807 rt->rt6i_flags &= ~RTF_EXPIRES;
1808 rt->rt6i_expires = 0;
1810 } else if (valid_lft) {
1811 clock_t expires = 0;
1812 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1813 if (addrconf_finite_timeout(rt_expires)) {
1815 flags |= RTF_EXPIRES;
1816 expires = jiffies_to_clock_t(rt_expires);
1818 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1819 dev, expires, flags);
1822 dst_release(&rt->u.dst);
1825 /* Try to figure out our local address for this prefix */
1827 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1828 struct inet6_ifaddr * ifp;
1829 struct in6_addr addr;
1830 int create = 0, update_lft = 0;
1832 if (pinfo->prefix_len == 64) {
1833 memcpy(&addr, &pinfo->prefix, 8);
1834 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1835 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1836 in6_dev_put(in6_dev);
1841 if (net_ratelimit())
1842 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1844 in6_dev_put(in6_dev);
1849 ifp = ipv6_get_ifaddr(dev_net(dev), &addr, dev, 1);
1851 if (ifp == NULL && valid_lft) {
1852 int max_addresses = in6_dev->cnf.max_addresses;
1855 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1856 if (in6_dev->cnf.optimistic_dad &&
1857 !ipv6_devconf.forwarding)
1858 addr_flags = IFA_F_OPTIMISTIC;
1861 /* Do not allow to create too much of autoconfigured
1862 * addresses; this would be too easy way to crash kernel.
1864 if (!max_addresses ||
1865 ipv6_count_addresses(in6_dev) < max_addresses)
1866 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1867 addr_type&IPV6_ADDR_SCOPE_MASK,
1870 if (!ifp || IS_ERR(ifp)) {
1871 in6_dev_put(in6_dev);
1875 update_lft = create = 1;
1876 ifp->cstamp = jiffies;
1877 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1883 #ifdef CONFIG_IPV6_PRIVACY
1884 struct inet6_ifaddr *ift;
1888 /* update lifetime (RFC2462 5.5.3 e) */
1889 spin_lock(&ifp->lock);
1891 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1892 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1895 if (!update_lft && stored_lft) {
1896 if (valid_lft > MIN_VALID_LIFETIME ||
1897 valid_lft > stored_lft)
1899 else if (stored_lft <= MIN_VALID_LIFETIME) {
1900 /* valid_lft <= stored_lft is always true */
1904 valid_lft = MIN_VALID_LIFETIME;
1905 if (valid_lft < prefered_lft)
1906 prefered_lft = valid_lft;
1912 ifp->valid_lft = valid_lft;
1913 ifp->prefered_lft = prefered_lft;
1916 ifp->flags &= ~IFA_F_DEPRECATED;
1917 spin_unlock(&ifp->lock);
1919 if (!(flags&IFA_F_TENTATIVE))
1920 ipv6_ifa_notify(0, ifp);
1922 spin_unlock(&ifp->lock);
1924 #ifdef CONFIG_IPV6_PRIVACY
1925 read_lock_bh(&in6_dev->lock);
1926 /* update all temporary addresses in the list */
1927 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1929 * When adjusting the lifetimes of an existing
1930 * temporary address, only lower the lifetimes.
1931 * Implementations must not increase the
1932 * lifetimes of an existing temporary address
1933 * when processing a Prefix Information Option.
1935 if (ifp != ift->ifpub)
1938 spin_lock(&ift->lock);
1940 if (ift->valid_lft > valid_lft &&
1941 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1942 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1943 if (ift->prefered_lft > prefered_lft &&
1944 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1945 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1946 spin_unlock(&ift->lock);
1947 if (!(flags&IFA_F_TENTATIVE))
1948 ipv6_ifa_notify(0, ift);
1951 if (create && in6_dev->cnf.use_tempaddr > 0) {
1953 * When a new public address is created as described in [ADDRCONF],
1954 * also create a new temporary address.
1956 read_unlock_bh(&in6_dev->lock);
1957 ipv6_create_tempaddr(ifp, NULL);
1959 read_unlock_bh(&in6_dev->lock);
1966 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1967 in6_dev_put(in6_dev);
1971 * Set destination address.
1972 * Special case for SIT interfaces where we create a new "virtual"
1975 int addrconf_set_dstaddr(struct net *net, void __user *arg)
1977 struct in6_ifreq ireq;
1978 struct net_device *dev;
1984 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1987 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1993 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1994 if (dev->type == ARPHRD_SIT) {
1997 struct ip_tunnel_parm p;
1999 err = -EADDRNOTAVAIL;
2000 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2003 memset(&p, 0, sizeof(p));
2004 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2008 p.iph.protocol = IPPROTO_IPV6;
2010 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2012 oldfs = get_fs(); set_fs(KERNEL_DS);
2013 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2018 dev = __dev_get_by_name(net, p.name);
2021 err = dev_open(dev);
2032 * Manual configuration of address on an interface
2034 static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx,
2035 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2038 struct inet6_ifaddr *ifp;
2039 struct inet6_dev *idev;
2040 struct net_device *dev;
2044 unsigned long timeout;
2051 /* check the lifetime */
2052 if (!valid_lft || prefered_lft > valid_lft)
2055 dev = __dev_get_by_index(net, ifindex);
2059 if ((idev = addrconf_add_dev(dev)) == NULL)
2062 scope = ipv6_addr_scope(pfx);
2064 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2065 if (addrconf_finite_timeout(timeout)) {
2066 expires = jiffies_to_clock_t(timeout * HZ);
2067 valid_lft = timeout;
2068 flags = RTF_EXPIRES;
2072 ifa_flags |= IFA_F_PERMANENT;
2075 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2076 if (addrconf_finite_timeout(timeout)) {
2078 ifa_flags |= IFA_F_DEPRECATED;
2079 prefered_lft = timeout;
2082 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2085 spin_lock_bh(&ifp->lock);
2086 ifp->valid_lft = valid_lft;
2087 ifp->prefered_lft = prefered_lft;
2088 ifp->tstamp = jiffies;
2089 spin_unlock_bh(&ifp->lock);
2091 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2094 * Note that section 3.1 of RFC 4429 indicates
2095 * that the Optimistic flag should not be set for
2096 * manually configured addresses
2098 addrconf_dad_start(ifp, 0);
2104 return PTR_ERR(ifp);
2107 static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx,
2110 struct inet6_ifaddr *ifp;
2111 struct inet6_dev *idev;
2112 struct net_device *dev;
2117 dev = __dev_get_by_index(net, ifindex);
2121 if ((idev = __in6_dev_get(dev)) == NULL)
2124 read_lock_bh(&idev->lock);
2125 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
2126 if (ifp->prefix_len == plen &&
2127 ipv6_addr_equal(pfx, &ifp->addr)) {
2129 read_unlock_bh(&idev->lock);
2133 /* If the last address is deleted administratively,
2134 disable IPv6 on this interface.
2136 if (idev->addr_list == NULL)
2137 addrconf_ifdown(idev->dev, 1);
2141 read_unlock_bh(&idev->lock);
2142 return -EADDRNOTAVAIL;
2146 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2148 struct in6_ifreq ireq;
2151 if (!capable(CAP_NET_ADMIN))
2154 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2158 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2159 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2160 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2165 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2167 struct in6_ifreq ireq;
2170 if (!capable(CAP_NET_ADMIN))
2173 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2177 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2178 ireq.ifr6_prefixlen);
2183 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2184 static void sit_add_v4_addrs(struct inet6_dev *idev)
2186 struct inet6_ifaddr * ifp;
2187 struct in6_addr addr;
2188 struct net_device *dev;
2189 struct net *net = dev_net(idev->dev);
2194 memset(&addr, 0, sizeof(struct in6_addr));
2195 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2197 if (idev->dev->flags&IFF_POINTOPOINT) {
2198 addr.s6_addr32[0] = htonl(0xfe800000);
2201 scope = IPV6_ADDR_COMPATv4;
2204 if (addr.s6_addr32[3]) {
2205 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
2207 spin_lock_bh(&ifp->lock);
2208 ifp->flags &= ~IFA_F_TENTATIVE;
2209 spin_unlock_bh(&ifp->lock);
2210 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2216 for_each_netdev(net, dev) {
2217 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2218 if (in_dev && (dev->flags & IFF_UP)) {
2219 struct in_ifaddr * ifa;
2223 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2226 addr.s6_addr32[3] = ifa->ifa_local;
2228 if (ifa->ifa_scope == RT_SCOPE_LINK)
2230 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2231 if (idev->dev->flags&IFF_POINTOPOINT)
2235 if (idev->dev->flags&IFF_POINTOPOINT)
2240 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2243 spin_lock_bh(&ifp->lock);
2244 ifp->flags &= ~IFA_F_TENTATIVE;
2245 spin_unlock_bh(&ifp->lock);
2246 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2255 static void init_loopback(struct net_device *dev)
2257 struct inet6_dev *idev;
2258 struct inet6_ifaddr * ifp;
2264 if ((idev = ipv6_find_idev(dev)) == NULL) {
2265 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2269 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2271 spin_lock_bh(&ifp->lock);
2272 ifp->flags &= ~IFA_F_TENTATIVE;
2273 spin_unlock_bh(&ifp->lock);
2274 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2279 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2281 struct inet6_ifaddr * ifp;
2282 u32 addr_flags = IFA_F_PERMANENT;
2284 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2285 if (idev->cnf.optimistic_dad &&
2286 !ipv6_devconf.forwarding)
2287 addr_flags |= IFA_F_OPTIMISTIC;
2291 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2293 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2294 addrconf_dad_start(ifp, 0);
2299 static void addrconf_dev_config(struct net_device *dev)
2301 struct in6_addr addr;
2302 struct inet6_dev * idev;
2306 if ((dev->type != ARPHRD_ETHER) &&
2307 (dev->type != ARPHRD_FDDI) &&
2308 (dev->type != ARPHRD_IEEE802_TR) &&
2309 (dev->type != ARPHRD_ARCNET) &&
2310 (dev->type != ARPHRD_INFINIBAND)) {
2311 /* Alas, we support only Ethernet autoconfiguration. */
2315 idev = addrconf_add_dev(dev);
2319 memset(&addr, 0, sizeof(struct in6_addr));
2320 addr.s6_addr32[0] = htonl(0xFE800000);
2322 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2323 addrconf_add_linklocal(idev, &addr);
2326 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2327 static void addrconf_sit_config(struct net_device *dev)
2329 struct inet6_dev *idev;
2334 * Configure the tunnel with one of our IPv4
2335 * addresses... we should configure all of
2336 * our v4 addrs in the tunnel
2339 if ((idev = ipv6_find_idev(dev)) == NULL) {
2340 printk(KERN_DEBUG "init sit: add_dev failed\n");
2344 if (dev->priv_flags & IFF_ISATAP) {
2345 struct in6_addr addr;
2347 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2348 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2349 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2350 addrconf_add_linklocal(idev, &addr);
2354 sit_add_v4_addrs(idev);
2356 if (dev->flags&IFF_POINTOPOINT) {
2357 addrconf_add_mroute(dev);
2358 addrconf_add_lroute(dev);
2365 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2367 struct in6_addr lladdr;
2369 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2370 addrconf_add_linklocal(idev, &lladdr);
2376 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2378 struct net_device *link_dev;
2379 struct net *net = dev_net(idev->dev);
2381 /* first try to inherit the link-local address from the link device */
2382 if (idev->dev->iflink &&
2383 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2384 if (!ipv6_inherit_linklocal(idev, link_dev))
2387 /* then try to inherit it from any device */
2388 for_each_netdev(net, link_dev) {
2389 if (!ipv6_inherit_linklocal(idev, link_dev))
2392 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2396 * Autoconfigure tunnel with a link-local address so routing protocols,
2397 * DHCPv6, MLD etc. can be run over the virtual link
2400 static void addrconf_ip6_tnl_config(struct net_device *dev)
2402 struct inet6_dev *idev;
2406 if ((idev = addrconf_add_dev(dev)) == NULL) {
2407 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2410 ip6_tnl_add_linklocal(idev);
2413 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2416 struct net_device *dev = (struct net_device *) data;
2417 struct inet6_dev *idev = __in6_dev_get(dev);
2418 int run_pending = 0;
2422 case NETDEV_REGISTER:
2423 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2424 idev = ipv6_add_dev(dev);
2426 return notifier_from_errno(-ENOMEM);
2431 if (dev->flags & IFF_SLAVE)
2434 if (event == NETDEV_UP) {
2435 if (!addrconf_qdisc_ok(dev)) {
2436 /* device is not ready yet. */
2438 "ADDRCONF(NETDEV_UP): %s: "
2439 "link is not ready\n",
2444 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2445 idev = ipv6_add_dev(dev);
2448 idev->if_flags |= IF_READY;
2450 if (!addrconf_qdisc_ok(dev)) {
2451 /* device is still not ready. */
2456 if (idev->if_flags & IF_READY) {
2457 /* device is already configured. */
2460 idev->if_flags |= IF_READY;
2464 "ADDRCONF(NETDEV_CHANGE): %s: "
2465 "link becomes ready\n",
2472 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2474 addrconf_sit_config(dev);
2477 case ARPHRD_TUNNEL6:
2478 addrconf_ip6_tnl_config(dev);
2480 case ARPHRD_LOOPBACK:
2485 addrconf_dev_config(dev);
2490 addrconf_dad_run(idev);
2492 /* If the MTU changed during the interface down, when the
2493 interface up, the changed MTU must be reflected in the
2494 idev as well as routers.
2496 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2497 rt6_mtu_change(dev, dev->mtu);
2498 idev->cnf.mtu6 = dev->mtu;
2500 idev->tstamp = jiffies;
2501 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2502 /* If the changed mtu during down is lower than IPV6_MIN_MTU
2503 stop IPv6 on this interface.
2505 if (dev->mtu < IPV6_MIN_MTU)
2506 addrconf_ifdown(dev, event != NETDEV_DOWN);
2510 case NETDEV_CHANGEMTU:
2511 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2512 rt6_mtu_change(dev, dev->mtu);
2513 idev->cnf.mtu6 = dev->mtu;
2517 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2518 idev = ipv6_add_dev(dev);
2523 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2526 case NETDEV_UNREGISTER:
2528 * Remove all addresses from this interface.
2530 addrconf_ifdown(dev, event != NETDEV_DOWN);
2533 case NETDEV_CHANGENAME:
2535 snmp6_unregister_dev(idev);
2536 addrconf_sysctl_unregister(idev);
2537 addrconf_sysctl_register(idev);
2538 err = snmp6_register_dev(idev);
2540 return notifier_from_errno(err);
2549 * addrconf module should be notified of a device going up
2551 static struct notifier_block ipv6_dev_notf = {
2552 .notifier_call = addrconf_notify,
2556 static int addrconf_ifdown(struct net_device *dev, int how)
2558 struct inet6_dev *idev;
2559 struct inet6_ifaddr *ifa, **bifa;
2560 struct net *net = dev_net(dev);
2565 if ((dev->flags & IFF_LOOPBACK) && how == 1)
2568 rt6_ifdown(net, dev);
2569 neigh_ifdown(&nd_tbl, dev);
2571 idev = __in6_dev_get(dev);
2575 /* Step 1: remove reference to ipv6 device from parent device.
2581 /* protected by rtnl_lock */
2582 rcu_assign_pointer(dev->ip6_ptr, NULL);
2584 /* Step 1.5: remove snmp6 entry */
2585 snmp6_unregister_dev(idev);
2589 /* Step 2: clear hash table */
2590 for (i=0; i<IN6_ADDR_HSIZE; i++) {
2591 bifa = &inet6_addr_lst[i];
2593 write_lock_bh(&addrconf_hash_lock);
2594 while ((ifa = *bifa) != NULL) {
2595 if (ifa->idev == idev) {
2596 *bifa = ifa->lst_next;
2597 ifa->lst_next = NULL;
2598 addrconf_del_timer(ifa);
2602 bifa = &ifa->lst_next;
2604 write_unlock_bh(&addrconf_hash_lock);
2607 write_lock_bh(&idev->lock);
2609 /* Step 3: clear flags for stateless addrconf */
2611 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2613 /* Step 4: clear address list */
2614 #ifdef CONFIG_IPV6_PRIVACY
2615 if (how && del_timer(&idev->regen_timer))
2618 /* clear tempaddr list */
2619 while ((ifa = idev->tempaddr_list) != NULL) {
2620 idev->tempaddr_list = ifa->tmp_next;
2621 ifa->tmp_next = NULL;
2623 write_unlock_bh(&idev->lock);
2624 spin_lock_bh(&ifa->lock);
2627 in6_ifa_put(ifa->ifpub);
2630 spin_unlock_bh(&ifa->lock);
2632 write_lock_bh(&idev->lock);
2635 while ((ifa = idev->addr_list) != NULL) {
2636 idev->addr_list = ifa->if_next;
2637 ifa->if_next = NULL;
2639 addrconf_del_timer(ifa);
2640 write_unlock_bh(&idev->lock);
2642 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2643 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2646 write_lock_bh(&idev->lock);
2648 write_unlock_bh(&idev->lock);
2650 /* Step 5: Discard multicast list */
2653 ipv6_mc_destroy_dev(idev);
2657 idev->tstamp = jiffies;
2659 /* Shot the device (if unregistered) */
2662 addrconf_sysctl_unregister(idev);
2663 neigh_parms_release(&nd_tbl, idev->nd_parms);
2664 neigh_ifdown(&nd_tbl, dev);
2670 static void addrconf_rs_timer(unsigned long data)
2672 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2674 if (ifp->idev->cnf.forwarding)
2677 if (ifp->idev->if_flags & IF_RA_RCVD) {
2679 * Announcement received after solicitation
2685 spin_lock(&ifp->lock);
2686 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2687 /* The wait after the last probe can be shorter */
2688 addrconf_mod_timer(ifp, AC_RS,
2689 (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2690 ifp->idev->cnf.rtr_solicit_delay :
2691 ifp->idev->cnf.rtr_solicit_interval);
2692 spin_unlock(&ifp->lock);
2694 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2696 spin_unlock(&ifp->lock);
2698 * Note: we do not support deprecated "all on-link"
2699 * assumption any longer.
2701 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2702 ifp->idev->dev->name);
2710 * Duplicate Address Detection
2712 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2714 unsigned long rand_num;
2715 struct inet6_dev *idev = ifp->idev;
2717 if (ifp->flags & IFA_F_OPTIMISTIC)
2720 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2722 ifp->probes = idev->cnf.dad_transmits;
2723 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2726 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2728 struct inet6_dev *idev = ifp->idev;
2729 struct net_device *dev = idev->dev;
2731 addrconf_join_solict(dev, &ifp->addr);
2733 net_srandom(ifp->addr.s6_addr32[3]);
2735 read_lock_bh(&idev->lock);
2738 spin_lock_bh(&ifp->lock);
2740 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2741 !(ifp->flags&IFA_F_TENTATIVE) ||
2742 ifp->flags & IFA_F_NODAD) {
2743 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2744 spin_unlock_bh(&ifp->lock);
2745 read_unlock_bh(&idev->lock);
2747 addrconf_dad_completed(ifp);
2751 if (!(idev->if_flags & IF_READY)) {
2752 spin_unlock_bh(&ifp->lock);
2753 read_unlock_bh(&idev->lock);
2755 * If the defice is not ready:
2756 * - keep it tentative if it is a permanent address.
2757 * - otherwise, kill it.
2760 addrconf_dad_stop(ifp);
2765 * Optimistic nodes can start receiving
2768 if(ifp->flags & IFA_F_OPTIMISTIC)
2769 ip6_ins_rt(ifp->rt);
2771 addrconf_dad_kick(ifp);
2772 spin_unlock_bh(&ifp->lock);
2774 read_unlock_bh(&idev->lock);
2777 static void addrconf_dad_timer(unsigned long data)
2779 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2780 struct inet6_dev *idev = ifp->idev;
2781 struct in6_addr mcaddr;
2783 read_lock_bh(&idev->lock);
2785 read_unlock_bh(&idev->lock);
2788 spin_lock_bh(&ifp->lock);
2789 if (ifp->probes == 0) {
2791 * DAD was successful
2794 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2795 spin_unlock_bh(&ifp->lock);
2796 read_unlock_bh(&idev->lock);
2798 addrconf_dad_completed(ifp);
2804 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2805 spin_unlock_bh(&ifp->lock);
2806 read_unlock_bh(&idev->lock);
2808 /* send a neighbour solicitation for our addr */
2809 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2810 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
2815 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2817 struct net_device * dev = ifp->idev->dev;
2820 * Configure the address for reception. Now it is valid.
2823 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2825 /* If added prefix is link local and forwarding is off,
2826 start sending router solicitations.
2829 if (ifp->idev->cnf.forwarding == 0 &&
2830 ifp->idev->cnf.rtr_solicits > 0 &&
2831 (dev->flags&IFF_LOOPBACK) == 0 &&
2832 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2834 * If a host as already performed a random delay
2835 * [...] as part of DAD [...] there is no need
2836 * to delay again before sending the first RS
2838 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2840 spin_lock_bh(&ifp->lock);
2842 ifp->idev->if_flags |= IF_RS_SENT;
2843 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2844 spin_unlock_bh(&ifp->lock);
2848 static void addrconf_dad_run(struct inet6_dev *idev) {
2849 struct inet6_ifaddr *ifp;
2851 read_lock_bh(&idev->lock);
2852 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2853 spin_lock_bh(&ifp->lock);
2854 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2855 spin_unlock_bh(&ifp->lock);
2858 spin_unlock_bh(&ifp->lock);
2859 addrconf_dad_kick(ifp);
2861 read_unlock_bh(&idev->lock);
2864 #ifdef CONFIG_PROC_FS
2865 struct if6_iter_state {
2866 struct seq_net_private p;
2870 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2872 struct inet6_ifaddr *ifa = NULL;
2873 struct if6_iter_state *state = seq->private;
2874 struct net *net = seq_file_net(seq);
2876 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2877 ifa = inet6_addr_lst[state->bucket];
2879 while (ifa && !net_eq(dev_net(ifa->idev->dev), net))
2880 ifa = ifa->lst_next;
2887 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2889 struct if6_iter_state *state = seq->private;
2890 struct net *net = seq_file_net(seq);
2892 ifa = ifa->lst_next;
2895 if (!net_eq(dev_net(ifa->idev->dev), net)) {
2896 ifa = ifa->lst_next;
2901 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2902 ifa = inet6_addr_lst[state->bucket];
2909 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2911 struct inet6_ifaddr *ifa = if6_get_first(seq);
2914 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2916 return pos ? NULL : ifa;
2919 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2920 __acquires(addrconf_hash_lock)
2922 read_lock_bh(&addrconf_hash_lock);
2923 return if6_get_idx(seq, *pos);
2926 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2928 struct inet6_ifaddr *ifa;
2930 ifa = if6_get_next(seq, v);
2935 static void if6_seq_stop(struct seq_file *seq, void *v)
2936 __releases(addrconf_hash_lock)
2938 read_unlock_bh(&addrconf_hash_lock);
2941 static int if6_seq_show(struct seq_file *seq, void *v)
2943 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2945 NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
2947 ifp->idev->dev->ifindex,
2951 ifp->idev->dev->name);
2955 static const struct seq_operations if6_seq_ops = {
2956 .start = if6_seq_start,
2957 .next = if6_seq_next,
2958 .show = if6_seq_show,
2959 .stop = if6_seq_stop,
2962 static int if6_seq_open(struct inode *inode, struct file *file)
2964 return seq_open_net(inode, file, &if6_seq_ops,
2965 sizeof(struct if6_iter_state));
2968 static const struct file_operations if6_fops = {
2969 .owner = THIS_MODULE,
2970 .open = if6_seq_open,
2972 .llseek = seq_lseek,
2973 .release = seq_release_net,
2976 static int if6_proc_net_init(struct net *net)
2978 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
2983 static void if6_proc_net_exit(struct net *net)
2985 proc_net_remove(net, "if_inet6");
2988 static struct pernet_operations if6_proc_net_ops = {
2989 .init = if6_proc_net_init,
2990 .exit = if6_proc_net_exit,
2993 int __init if6_proc_init(void)
2995 return register_pernet_subsys(&if6_proc_net_ops);
2998 void if6_proc_exit(void)
3000 unregister_pernet_subsys(&if6_proc_net_ops);
3002 #endif /* CONFIG_PROC_FS */
3004 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3005 /* Check if address is a home address configured on any interface. */
3006 int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
3009 struct inet6_ifaddr * ifp;
3010 u8 hash = ipv6_addr_hash(addr);
3011 read_lock_bh(&addrconf_hash_lock);
3012 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
3013 if (!net_eq(dev_net(ifp->idev->dev), net))
3015 if (ipv6_addr_equal(&ifp->addr, addr) &&
3016 (ifp->flags & IFA_F_HOMEADDRESS)) {
3021 read_unlock_bh(&addrconf_hash_lock);
3027 * Periodic address status verification
3030 static void addrconf_verify(unsigned long foo)
3032 struct inet6_ifaddr *ifp;
3033 unsigned long now, next;
3036 spin_lock_bh(&addrconf_verify_lock);
3038 next = now + ADDR_CHECK_FREQUENCY;
3040 del_timer(&addr_chk_timer);
3042 for (i=0; i < IN6_ADDR_HSIZE; i++) {
3045 read_lock(&addrconf_hash_lock);
3046 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
3048 #ifdef CONFIG_IPV6_PRIVACY
3049 unsigned long regen_advance;
3052 if (ifp->flags & IFA_F_PERMANENT)
3055 spin_lock(&ifp->lock);
3056 age = (now - ifp->tstamp) / HZ;
3058 #ifdef CONFIG_IPV6_PRIVACY
3059 regen_advance = ifp->idev->cnf.regen_max_retry *
3060 ifp->idev->cnf.dad_transmits *
3061 ifp->idev->nd_parms->retrans_time / HZ;
3064 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3065 age >= ifp->valid_lft) {
3066 spin_unlock(&ifp->lock);
3068 read_unlock(&addrconf_hash_lock);
3071 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3072 spin_unlock(&ifp->lock);
3074 } else if (age >= ifp->prefered_lft) {
3075 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
3078 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3080 ifp->flags |= IFA_F_DEPRECATED;
3083 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3084 next = ifp->tstamp + ifp->valid_lft * HZ;
3086 spin_unlock(&ifp->lock);
3090 read_unlock(&addrconf_hash_lock);
3092 ipv6_ifa_notify(0, ifp);
3096 #ifdef CONFIG_IPV6_PRIVACY
3097 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3098 !(ifp->flags&IFA_F_TENTATIVE)) {
3099 if (age >= ifp->prefered_lft - regen_advance) {
3100 struct inet6_ifaddr *ifpub = ifp->ifpub;
3101 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3102 next = ifp->tstamp + ifp->prefered_lft * HZ;
3103 if (!ifp->regen_count && ifpub) {
3106 in6_ifa_hold(ifpub);
3107 spin_unlock(&ifp->lock);
3108 read_unlock(&addrconf_hash_lock);
3109 spin_lock(&ifpub->lock);
3110 ifpub->regen_count = 0;
3111 spin_unlock(&ifpub->lock);
3112 ipv6_create_tempaddr(ifpub, ifp);
3117 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3118 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3119 spin_unlock(&ifp->lock);
3122 /* ifp->prefered_lft <= ifp->valid_lft */
3123 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3124 next = ifp->tstamp + ifp->prefered_lft * HZ;
3125 spin_unlock(&ifp->lock);
3128 read_unlock(&addrconf_hash_lock);
3131 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
3132 add_timer(&addr_chk_timer);
3133 spin_unlock_bh(&addrconf_verify_lock);
3136 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3138 struct in6_addr *pfx = NULL;
3141 pfx = nla_data(addr);
3144 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3147 pfx = nla_data(local);
3153 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3154 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3155 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3156 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3160 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3162 struct net *net = sock_net(skb->sk);
3163 struct ifaddrmsg *ifm;
3164 struct nlattr *tb[IFA_MAX+1];
3165 struct in6_addr *pfx;
3168 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3172 ifm = nlmsg_data(nlh);
3173 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3177 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3180 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3181 u32 prefered_lft, u32 valid_lft)
3185 unsigned long timeout;
3187 if (!valid_lft || (prefered_lft > valid_lft))
3190 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3191 if (addrconf_finite_timeout(timeout)) {
3192 expires = jiffies_to_clock_t(timeout * HZ);
3193 valid_lft = timeout;
3194 flags = RTF_EXPIRES;
3198 ifa_flags |= IFA_F_PERMANENT;
3201 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3202 if (addrconf_finite_timeout(timeout)) {
3204 ifa_flags |= IFA_F_DEPRECATED;
3205 prefered_lft = timeout;
3208 spin_lock_bh(&ifp->lock);
3209 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3210 ifp->tstamp = jiffies;
3211 ifp->valid_lft = valid_lft;
3212 ifp->prefered_lft = prefered_lft;
3214 spin_unlock_bh(&ifp->lock);
3215 if (!(ifp->flags&IFA_F_TENTATIVE))
3216 ipv6_ifa_notify(0, ifp);
3218 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3226 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3228 struct net *net = sock_net(skb->sk);
3229 struct ifaddrmsg *ifm;
3230 struct nlattr *tb[IFA_MAX+1];
3231 struct in6_addr *pfx;
3232 struct inet6_ifaddr *ifa;
3233 struct net_device *dev;
3234 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3238 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3242 ifm = nlmsg_data(nlh);
3243 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3247 if (tb[IFA_CACHEINFO]) {
3248 struct ifa_cacheinfo *ci;
3250 ci = nla_data(tb[IFA_CACHEINFO]);
3251 valid_lft = ci->ifa_valid;
3252 preferred_lft = ci->ifa_prefered;
3254 preferred_lft = INFINITY_LIFE_TIME;
3255 valid_lft = INFINITY_LIFE_TIME;
3258 dev = __dev_get_by_index(net, ifm->ifa_index);
3262 /* We ignore other flags so far. */
3263 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3265 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3268 * It would be best to check for !NLM_F_CREATE here but
3269 * userspace alreay relies on not having to provide this.
3271 return inet6_addr_add(net, ifm->ifa_index, pfx,
3272 ifm->ifa_prefixlen, ifa_flags,
3273 preferred_lft, valid_lft);
3276 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3277 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3280 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3287 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3288 u8 scope, int ifindex)
3290 struct ifaddrmsg *ifm;
3292 ifm = nlmsg_data(nlh);
3293 ifm->ifa_family = AF_INET6;
3294 ifm->ifa_prefixlen = prefixlen;
3295 ifm->ifa_flags = flags;
3296 ifm->ifa_scope = scope;
3297 ifm->ifa_index = ifindex;
3300 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3301 unsigned long tstamp, u32 preferred, u32 valid)
3303 struct ifa_cacheinfo ci;
3305 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3306 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3307 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3308 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3309 ci.ifa_prefered = preferred;
3310 ci.ifa_valid = valid;
3312 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3315 static inline int rt_scope(int ifa_scope)
3317 if (ifa_scope & IFA_HOST)
3318 return RT_SCOPE_HOST;
3319 else if (ifa_scope & IFA_LINK)
3320 return RT_SCOPE_LINK;
3321 else if (ifa_scope & IFA_SITE)
3322 return RT_SCOPE_SITE;
3324 return RT_SCOPE_UNIVERSE;
3327 static inline int inet6_ifaddr_msgsize(void)
3329 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3330 + nla_total_size(16) /* IFA_ADDRESS */
3331 + nla_total_size(sizeof(struct ifa_cacheinfo));
3334 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3335 u32 pid, u32 seq, int event, unsigned int flags)
3337 struct nlmsghdr *nlh;
3338 u32 preferred, valid;
3340 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3344 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3345 ifa->idev->dev->ifindex);
3347 if (!(ifa->flags&IFA_F_PERMANENT)) {
3348 preferred = ifa->prefered_lft;
3349 valid = ifa->valid_lft;
3350 if (preferred != INFINITY_LIFE_TIME) {
3351 long tval = (jiffies - ifa->tstamp)/HZ;
3353 if (valid != INFINITY_LIFE_TIME)
3357 preferred = INFINITY_LIFE_TIME;
3358 valid = INFINITY_LIFE_TIME;
3361 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3362 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3363 nlmsg_cancel(skb, nlh);
3367 return nlmsg_end(skb, nlh);
3370 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3371 u32 pid, u32 seq, int event, u16 flags)
3373 struct nlmsghdr *nlh;
3374 u8 scope = RT_SCOPE_UNIVERSE;
3375 int ifindex = ifmca->idev->dev->ifindex;
3377 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3378 scope = RT_SCOPE_SITE;
3380 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3384 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3385 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3386 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3387 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3388 nlmsg_cancel(skb, nlh);
3392 return nlmsg_end(skb, nlh);
3395 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3396 u32 pid, u32 seq, int event, unsigned int flags)
3398 struct nlmsghdr *nlh;
3399 u8 scope = RT_SCOPE_UNIVERSE;
3400 int ifindex = ifaca->aca_idev->dev->ifindex;
3402 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3403 scope = RT_SCOPE_SITE;
3405 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3409 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3410 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3411 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3412 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3413 nlmsg_cancel(skb, nlh);
3417 return nlmsg_end(skb, nlh);
3427 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3428 enum addr_type_t type)
3431 int s_idx, s_ip_idx;
3433 struct net_device *dev;
3434 struct inet6_dev *idev = NULL;
3435 struct inet6_ifaddr *ifa;
3436 struct ifmcaddr6 *ifmca;
3437 struct ifacaddr6 *ifaca;
3438 struct net *net = sock_net(skb->sk);
3440 s_idx = cb->args[0];
3441 s_ip_idx = ip_idx = cb->args[1];
3444 for_each_netdev(net, dev) {
3450 if ((idev = in6_dev_get(dev)) == NULL)
3452 read_lock_bh(&idev->lock);
3455 /* unicast address incl. temp addr */
3456 for (ifa = idev->addr_list; ifa;
3457 ifa = ifa->if_next, ip_idx++) {
3458 if (ip_idx < s_ip_idx)
3460 err = inet6_fill_ifaddr(skb, ifa,
3461 NETLINK_CB(cb->skb).pid,
3467 case MULTICAST_ADDR:
3468 /* multicast address */
3469 for (ifmca = idev->mc_list; ifmca;
3470 ifmca = ifmca->next, ip_idx++) {
3471 if (ip_idx < s_ip_idx)
3473 err = inet6_fill_ifmcaddr(skb, ifmca,
3474 NETLINK_CB(cb->skb).pid,
3481 /* anycast address */
3482 for (ifaca = idev->ac_list; ifaca;
3483 ifaca = ifaca->aca_next, ip_idx++) {
3484 if (ip_idx < s_ip_idx)
3486 err = inet6_fill_ifacaddr(skb, ifaca,
3487 NETLINK_CB(cb->skb).pid,
3496 read_unlock_bh(&idev->lock);
3505 cb->args[1] = ip_idx;
3509 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3511 enum addr_type_t type = UNICAST_ADDR;
3513 return inet6_dump_addr(skb, cb, type);
3516 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3518 enum addr_type_t type = MULTICAST_ADDR;
3520 return inet6_dump_addr(skb, cb, type);
3524 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3526 enum addr_type_t type = ANYCAST_ADDR;
3528 return inet6_dump_addr(skb, cb, type);
3531 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3534 struct net *net = sock_net(in_skb->sk);
3535 struct ifaddrmsg *ifm;
3536 struct nlattr *tb[IFA_MAX+1];
3537 struct in6_addr *addr = NULL;
3538 struct net_device *dev = NULL;
3539 struct inet6_ifaddr *ifa;
3540 struct sk_buff *skb;
3543 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3547 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3553 ifm = nlmsg_data(nlh);
3555 dev = __dev_get_by_index(net, ifm->ifa_index);
3557 if ((ifa = ipv6_get_ifaddr(net, addr, dev, 1)) == NULL) {
3558 err = -EADDRNOTAVAIL;
3562 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
3567 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3568 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3570 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3571 WARN_ON(err == -EMSGSIZE);
3575 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
3582 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3584 struct sk_buff *skb;
3585 struct net *net = dev_net(ifa->idev->dev);
3588 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3592 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3594 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3595 WARN_ON(err == -EMSGSIZE);
3599 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3602 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3605 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3606 __s32 *array, int bytes)
3608 BUG_ON(bytes < (DEVCONF_MAX * 4));
3610 memset(array, 0, bytes);
3611 array[DEVCONF_FORWARDING] = cnf->forwarding;
3612 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3613 array[DEVCONF_MTU6] = cnf->mtu6;
3614 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3615 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3616 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3617 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3618 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3619 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3620 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3621 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3622 #ifdef CONFIG_IPV6_PRIVACY
3623 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3624 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3625 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3626 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3627 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3629 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3630 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3631 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3632 #ifdef CONFIG_IPV6_ROUTER_PREF
3633 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3634 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3635 #ifdef CONFIG_IPV6_ROUTE_INFO
3636 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3639 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3640 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3641 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3642 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3644 #ifdef CONFIG_IPV6_MROUTE
3645 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3649 static inline size_t inet6_if_nlmsg_size(void)
3651 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3652 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3653 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3654 + nla_total_size(4) /* IFLA_MTU */
3655 + nla_total_size(4) /* IFLA_LINK */
3656 + nla_total_size( /* IFLA_PROTINFO */
3657 nla_total_size(4) /* IFLA_INET6_FLAGS */
3658 + nla_total_size(sizeof(struct ifla_cacheinfo))
3659 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3660 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3661 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
3665 static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
3669 int pad = bytes - sizeof(u64) * items;
3672 /* Use put_unaligned() because stats may not be aligned for u64. */
3673 put_unaligned(items, &stats[0]);
3674 for (i = 1; i < items; i++)
3675 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3677 memset(&stats[items], 0, pad);
3680 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3684 case IFLA_INET6_STATS:
3685 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3687 case IFLA_INET6_ICMP6STATS:
3688 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3693 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3694 u32 pid, u32 seq, int event, unsigned int flags)
3696 struct net_device *dev = idev->dev;
3698 struct ifinfomsg *hdr;
3699 struct nlmsghdr *nlh;
3701 struct ifla_cacheinfo ci;
3703 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3707 hdr = nlmsg_data(nlh);
3708 hdr->ifi_family = AF_INET6;
3710 hdr->ifi_type = dev->type;
3711 hdr->ifi_index = dev->ifindex;
3712 hdr->ifi_flags = dev_get_flags(dev);
3713 hdr->ifi_change = 0;
3715 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3718 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3720 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3721 if (dev->ifindex != dev->iflink)
3722 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3724 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3725 if (protoinfo == NULL)
3726 goto nla_put_failure;
3728 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3730 ci.max_reasm_len = IPV6_MAXPLEN;
3731 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3732 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3733 ci.reachable_time = idev->nd_parms->reachable_time;
3734 ci.retrans_time = idev->nd_parms->retrans_time;
3735 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3737 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3739 goto nla_put_failure;
3740 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3742 /* XXX - MC not implemented */
3744 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3746 goto nla_put_failure;
3747 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3749 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3751 goto nla_put_failure;
3752 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3754 nla_nest_end(skb, protoinfo);
3755 return nlmsg_end(skb, nlh);
3758 nlmsg_cancel(skb, nlh);
3762 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3764 struct net *net = sock_net(skb->sk);
3766 int s_idx = cb->args[0];
3767 struct net_device *dev;
3768 struct inet6_dev *idev;
3770 read_lock(&dev_base_lock);
3772 for_each_netdev(net, dev) {
3775 if ((idev = in6_dev_get(dev)) == NULL)
3777 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3778 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3785 read_unlock(&dev_base_lock);
3791 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3793 struct sk_buff *skb;
3794 struct net *net = dev_net(idev->dev);
3797 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
3801 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
3803 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3804 WARN_ON(err == -EMSGSIZE);
3808 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3811 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3814 static inline size_t inet6_prefix_nlmsg_size(void)
3816 return NLMSG_ALIGN(sizeof(struct prefixmsg))
3817 + nla_total_size(sizeof(struct in6_addr))
3818 + nla_total_size(sizeof(struct prefix_cacheinfo));
3821 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3822 struct prefix_info *pinfo, u32 pid, u32 seq,
3823 int event, unsigned int flags)
3825 struct prefixmsg *pmsg;
3826 struct nlmsghdr *nlh;
3827 struct prefix_cacheinfo ci;
3829 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3833 pmsg = nlmsg_data(nlh);
3834 pmsg->prefix_family = AF_INET6;
3835 pmsg->prefix_pad1 = 0;
3836 pmsg->prefix_pad2 = 0;
3837 pmsg->prefix_ifindex = idev->dev->ifindex;
3838 pmsg->prefix_len = pinfo->prefix_len;
3839 pmsg->prefix_type = pinfo->type;
3840 pmsg->prefix_pad3 = 0;
3841 pmsg->prefix_flags = 0;
3843 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3844 if (pinfo->autoconf)
3845 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3847 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3849 ci.preferred_time = ntohl(pinfo->prefered);
3850 ci.valid_time = ntohl(pinfo->valid);
3851 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3853 return nlmsg_end(skb, nlh);
3856 nlmsg_cancel(skb, nlh);
3860 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3861 struct prefix_info *pinfo)
3863 struct sk_buff *skb;
3864 struct net *net = dev_net(idev->dev);
3867 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
3871 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
3873 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3874 WARN_ON(err == -EMSGSIZE);
3878 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3881 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
3884 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3886 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3891 * If the address was optimistic
3892 * we inserted the route at the start of
3893 * our DAD process, so we don't need
3896 if (!(ifp->rt->rt6i_node))
3897 ip6_ins_rt(ifp->rt);
3898 if (ifp->idev->cnf.forwarding)
3899 addrconf_join_anycast(ifp);
3902 if (ifp->idev->cnf.forwarding)
3903 addrconf_leave_anycast(ifp);
3904 addrconf_leave_solict(ifp->idev, &ifp->addr);
3905 dst_hold(&ifp->rt->u.dst);
3906 if (ip6_del_rt(ifp->rt))
3907 dst_free(&ifp->rt->u.dst);
3912 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3915 if (likely(ifp->idev->dead == 0))
3916 __ipv6_ifa_notify(event, ifp);
3917 rcu_read_unlock_bh();
3920 #ifdef CONFIG_SYSCTL
3923 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3924 void __user *buffer, size_t *lenp, loff_t *ppos)
3926 int *valp = ctl->data;
3930 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3933 addrconf_fixup_forwarding(ctl, valp, val);
3937 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3938 int __user *name, int nlen,
3939 void __user *oldval,
3940 size_t __user *oldlenp,
3941 void __user *newval, size_t newlen)
3943 int *valp = table->data;
3947 if (!newval || !newlen)
3949 if (newlen != sizeof(int))
3951 if (get_user(new, (int __user *)newval))
3955 if (oldval && oldlenp) {
3957 if (get_user(len, oldlenp))
3960 if (len > table->maxlen)
3961 len = table->maxlen;
3962 if (copy_to_user(oldval, valp, len))
3964 if (put_user(len, oldlenp))
3970 addrconf_fixup_forwarding(table, valp, val);
3974 static struct addrconf_sysctl_table
3976 struct ctl_table_header *sysctl_header;
3977 ctl_table addrconf_vars[DEVCONF_MAX+1];
3979 } addrconf_sysctl __read_mostly = {
3980 .sysctl_header = NULL,
3983 .ctl_name = NET_IPV6_FORWARDING,
3984 .procname = "forwarding",
3985 .data = &ipv6_devconf.forwarding,
3986 .maxlen = sizeof(int),
3988 .proc_handler = &addrconf_sysctl_forward,
3989 .strategy = &addrconf_sysctl_forward_strategy,
3992 .ctl_name = NET_IPV6_HOP_LIMIT,
3993 .procname = "hop_limit",
3994 .data = &ipv6_devconf.hop_limit,
3995 .maxlen = sizeof(int),
3997 .proc_handler = proc_dointvec,
4000 .ctl_name = NET_IPV6_MTU,
4002 .data = &ipv6_devconf.mtu6,
4003 .maxlen = sizeof(int),
4005 .proc_handler = &proc_dointvec,
4008 .ctl_name = NET_IPV6_ACCEPT_RA,
4009 .procname = "accept_ra",
4010 .data = &ipv6_devconf.accept_ra,
4011 .maxlen = sizeof(int),
4013 .proc_handler = &proc_dointvec,
4016 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS,
4017 .procname = "accept_redirects",
4018 .data = &ipv6_devconf.accept_redirects,
4019 .maxlen = sizeof(int),
4021 .proc_handler = &proc_dointvec,
4024 .ctl_name = NET_IPV6_AUTOCONF,
4025 .procname = "autoconf",
4026 .data = &ipv6_devconf.autoconf,
4027 .maxlen = sizeof(int),
4029 .proc_handler = &proc_dointvec,
4032 .ctl_name = NET_IPV6_DAD_TRANSMITS,
4033 .procname = "dad_transmits",
4034 .data = &ipv6_devconf.dad_transmits,
4035 .maxlen = sizeof(int),
4037 .proc_handler = &proc_dointvec,
4040 .ctl_name = NET_IPV6_RTR_SOLICITS,
4041 .procname = "router_solicitations",
4042 .data = &ipv6_devconf.rtr_solicits,
4043 .maxlen = sizeof(int),
4045 .proc_handler = &proc_dointvec,
4048 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL,
4049 .procname = "router_solicitation_interval",
4050 .data = &ipv6_devconf.rtr_solicit_interval,
4051 .maxlen = sizeof(int),
4053 .proc_handler = &proc_dointvec_jiffies,
4054 .strategy = &sysctl_jiffies,
4057 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY,
4058 .procname = "router_solicitation_delay",
4059 .data = &ipv6_devconf.rtr_solicit_delay,
4060 .maxlen = sizeof(int),
4062 .proc_handler = &proc_dointvec_jiffies,
4063 .strategy = &sysctl_jiffies,
4066 .ctl_name = NET_IPV6_FORCE_MLD_VERSION,
4067 .procname = "force_mld_version",
4068 .data = &ipv6_devconf.force_mld_version,
4069 .maxlen = sizeof(int),
4071 .proc_handler = &proc_dointvec,
4073 #ifdef CONFIG_IPV6_PRIVACY
4075 .ctl_name = NET_IPV6_USE_TEMPADDR,
4076 .procname = "use_tempaddr",
4077 .data = &ipv6_devconf.use_tempaddr,
4078 .maxlen = sizeof(int),
4080 .proc_handler = &proc_dointvec,
4083 .ctl_name = NET_IPV6_TEMP_VALID_LFT,
4084 .procname = "temp_valid_lft",
4085 .data = &ipv6_devconf.temp_valid_lft,
4086 .maxlen = sizeof(int),
4088 .proc_handler = &proc_dointvec,
4091 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT,
4092 .procname = "temp_prefered_lft",
4093 .data = &ipv6_devconf.temp_prefered_lft,
4094 .maxlen = sizeof(int),
4096 .proc_handler = &proc_dointvec,
4099 .ctl_name = NET_IPV6_REGEN_MAX_RETRY,
4100 .procname = "regen_max_retry",
4101 .data = &ipv6_devconf.regen_max_retry,
4102 .maxlen = sizeof(int),
4104 .proc_handler = &proc_dointvec,
4107 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR,
4108 .procname = "max_desync_factor",
4109 .data = &ipv6_devconf.max_desync_factor,
4110 .maxlen = sizeof(int),
4112 .proc_handler = &proc_dointvec,
4116 .ctl_name = NET_IPV6_MAX_ADDRESSES,
4117 .procname = "max_addresses",
4118 .data = &ipv6_devconf.max_addresses,
4119 .maxlen = sizeof(int),
4121 .proc_handler = &proc_dointvec,
4124 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR,
4125 .procname = "accept_ra_defrtr",
4126 .data = &ipv6_devconf.accept_ra_defrtr,
4127 .maxlen = sizeof(int),
4129 .proc_handler = &proc_dointvec,
4132 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO,
4133 .procname = "accept_ra_pinfo",
4134 .data = &ipv6_devconf.accept_ra_pinfo,
4135 .maxlen = sizeof(int),
4137 .proc_handler = &proc_dointvec,
4139 #ifdef CONFIG_IPV6_ROUTER_PREF
4141 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF,
4142 .procname = "accept_ra_rtr_pref",
4143 .data = &ipv6_devconf.accept_ra_rtr_pref,
4144 .maxlen = sizeof(int),
4146 .proc_handler = &proc_dointvec,
4149 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL,
4150 .procname = "router_probe_interval",
4151 .data = &ipv6_devconf.rtr_probe_interval,
4152 .maxlen = sizeof(int),
4154 .proc_handler = &proc_dointvec_jiffies,
4155 .strategy = &sysctl_jiffies,
4157 #ifdef CONFIG_IPV6_ROUTE_INFO
4159 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
4160 .procname = "accept_ra_rt_info_max_plen",
4161 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4162 .maxlen = sizeof(int),
4164 .proc_handler = &proc_dointvec,
4169 .ctl_name = NET_IPV6_PROXY_NDP,
4170 .procname = "proxy_ndp",
4171 .data = &ipv6_devconf.proxy_ndp,
4172 .maxlen = sizeof(int),
4174 .proc_handler = &proc_dointvec,
4177 .ctl_name = NET_IPV6_ACCEPT_SOURCE_ROUTE,
4178 .procname = "accept_source_route",
4179 .data = &ipv6_devconf.accept_source_route,
4180 .maxlen = sizeof(int),
4182 .proc_handler = &proc_dointvec,
4184 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4186 .ctl_name = CTL_UNNUMBERED,
4187 .procname = "optimistic_dad",
4188 .data = &ipv6_devconf.optimistic_dad,
4189 .maxlen = sizeof(int),
4191 .proc_handler = &proc_dointvec,
4195 #ifdef CONFIG_IPV6_MROUTE
4197 .ctl_name = CTL_UNNUMBERED,
4198 .procname = "mc_forwarding",
4199 .data = &ipv6_devconf.mc_forwarding,
4200 .maxlen = sizeof(int),
4202 .proc_handler = &proc_dointvec,
4206 .ctl_name = 0, /* sentinel */
4211 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4212 int ctl_name, struct inet6_dev *idev, struct ipv6_devconf *p)
4215 struct addrconf_sysctl_table *t;
4217 #define ADDRCONF_CTL_PATH_DEV 3
4219 struct ctl_path addrconf_ctl_path[] = {
4220 { .procname = "net", .ctl_name = CTL_NET, },
4221 { .procname = "ipv6", .ctl_name = NET_IPV6, },
4222 { .procname = "conf", .ctl_name = NET_IPV6_CONF, },
4223 { /* to be set */ },
4228 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4232 for (i=0; t->addrconf_vars[i].data; i++) {
4233 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
4234 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4235 t->addrconf_vars[i].extra2 = net;
4239 * Make a copy of dev_name, because '.procname' is regarded as const
4240 * by sysctl and we wouldn't want anyone to change it under our feet
4241 * (see SIOCSIFNAME).
4243 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4247 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4248 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].ctl_name = ctl_name;
4250 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4252 if (t->sysctl_header == NULL)
4266 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4268 struct addrconf_sysctl_table *t;
4270 if (p->sysctl == NULL)
4275 unregister_sysctl_table(t->sysctl_header);
4280 static void addrconf_sysctl_register(struct inet6_dev *idev)
4282 neigh_sysctl_register(idev->dev, idev->nd_parms, NET_IPV6,
4283 NET_IPV6_NEIGH, "ipv6",
4284 &ndisc_ifinfo_sysctl_change,
4285 ndisc_ifinfo_sysctl_strategy);
4286 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4287 idev->dev->ifindex, idev, &idev->cnf);
4290 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4292 __addrconf_sysctl_unregister(&idev->cnf);
4293 neigh_sysctl_unregister(idev->nd_parms);
4299 static int addrconf_init_net(struct net *net)
4302 struct ipv6_devconf *all, *dflt;
4305 all = &ipv6_devconf;
4306 dflt = &ipv6_devconf_dflt;
4308 if (net != &init_net) {
4309 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4313 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4315 goto err_alloc_dflt;
4318 net->ipv6.devconf_all = all;
4319 net->ipv6.devconf_dflt = dflt;
4321 #ifdef CONFIG_SYSCTL
4322 err = __addrconf_sysctl_register(net, "all", NET_PROTO_CONF_ALL,
4327 err = __addrconf_sysctl_register(net, "default", NET_PROTO_CONF_DEFAULT,
4334 #ifdef CONFIG_SYSCTL
4336 __addrconf_sysctl_unregister(all);
4346 static void addrconf_exit_net(struct net *net)
4348 #ifdef CONFIG_SYSCTL
4349 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4350 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4352 if (net != &init_net) {
4353 kfree(net->ipv6.devconf_dflt);
4354 kfree(net->ipv6.devconf_all);
4358 static struct pernet_operations addrconf_ops = {
4359 .init = addrconf_init_net,
4360 .exit = addrconf_exit_net,
4367 int register_inet6addr_notifier(struct notifier_block *nb)
4369 return atomic_notifier_chain_register(&inet6addr_chain, nb);
4372 EXPORT_SYMBOL(register_inet6addr_notifier);
4374 int unregister_inet6addr_notifier(struct notifier_block *nb)
4376 return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
4379 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4381 static void addrconf_net_exit(struct net *net)
4383 struct net_device *dev;
4386 /* clean dev list */
4387 for_each_netdev(net, dev) {
4388 if (__in6_dev_get(dev) == NULL)
4390 addrconf_ifdown(dev, 1);
4392 addrconf_ifdown(net->loopback_dev, 2);
4396 static struct pernet_operations addrconf_net_ops = {
4397 .exit = addrconf_net_exit,
4401 * Init / cleanup code
4404 int __init addrconf_init(void)
4408 if ((err = ipv6_addr_label_init()) < 0) {
4409 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n",
4414 register_pernet_subsys(&addrconf_ops);
4416 /* The addrconf netdev notifier requires that loopback_dev
4417 * has it's ipv6 private information allocated and setup
4418 * before it can bring up and give link-local addresses
4419 * to other devices which are up.
4421 * Unfortunately, loopback_dev is not necessarily the first
4422 * entry in the global dev_base list of net devices. In fact,
4423 * it is likely to be the very last entry on that list.
4424 * So this causes the notifier registry below to try and
4425 * give link-local addresses to all devices besides loopback_dev
4426 * first, then loopback_dev, which cases all the non-loopback_dev
4427 * devices to fail to get a link-local address.
4429 * So, as a temporary fix, allocate the ipv6 structure for
4430 * loopback_dev first by hand.
4431 * Longer term, all of the dependencies ipv6 has upon the loopback
4432 * device and it being up should be removed.
4435 if (!ipv6_add_dev(init_net.loopback_dev))
4441 err = register_pernet_device(&addrconf_net_ops);
4445 register_netdevice_notifier(&ipv6_dev_notf);
4449 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4453 /* Only the first call to __rtnl_register can fail */
4454 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4455 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4456 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4457 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4458 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4460 ipv6_addr_label_rtnl_register();
4464 unregister_netdevice_notifier(&ipv6_dev_notf);
4466 unregister_pernet_subsys(&addrconf_ops);
4471 void addrconf_cleanup(void)
4473 struct inet6_ifaddr *ifa;
4476 unregister_netdevice_notifier(&ipv6_dev_notf);
4477 unregister_pernet_device(&addrconf_net_ops);
4479 unregister_pernet_subsys(&addrconf_ops);
4486 write_lock_bh(&addrconf_hash_lock);
4487 for (i=0; i < IN6_ADDR_HSIZE; i++) {
4488 for (ifa=inet6_addr_lst[i]; ifa; ) {
4489 struct inet6_ifaddr *bifa;
4492 ifa = ifa->lst_next;
4493 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4494 /* Do not free it; something is wrong.
4495 Now we can investigate it with debugger.
4499 write_unlock_bh(&addrconf_hash_lock);
4501 del_timer(&addr_chk_timer);
4504 unregister_pernet_subsys(&addrconf_net_ops);