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/kernel.h>
44 #include <linux/socket.h>
45 #include <linux/sockios.h>
46 #include <linux/net.h>
47 #include <linux/in6.h>
48 #include <linux/netdevice.h>
49 #include <linux/if_addr.h>
50 #include <linux/if_arp.h>
51 #include <linux/if_arcnet.h>
52 #include <linux/if_infiniband.h>
53 #include <linux/route.h>
54 #include <linux/inetdevice.h>
55 #include <linux/init.h>
57 #include <linux/sysctl.h>
59 #include <linux/capability.h>
60 #include <linux/delay.h>
61 #include <linux/notifier.h>
62 #include <linux/string.h>
64 #include <net/net_namespace.h>
69 #include <net/protocol.h>
70 #include <net/ndisc.h>
71 #include <net/ip6_route.h>
72 #include <net/addrconf.h>
75 #include <net/netlink.h>
76 #include <net/pkt_sched.h>
77 #include <linux/if_tunnel.h>
78 #include <linux/rtnetlink.h>
80 #ifdef CONFIG_IPV6_PRIVACY
81 #include <linux/random.h>
84 #include <linux/uaccess.h>
85 #include <asm/unaligned.h>
87 #include <linux/proc_fs.h>
88 #include <linux/seq_file.h>
90 /* Set to 3 to get tracing... */
94 #define ADBG(x) printk x
99 #define INFINITY_LIFE_TIME 0xFFFFFFFF
100 #define TIME_DELTA(a, b) ((unsigned long)((long)(a) - (long)(b)))
103 static void addrconf_sysctl_register(struct inet6_dev *idev);
104 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
106 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
110 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
115 #ifdef CONFIG_IPV6_PRIVACY
116 static int __ipv6_regen_rndid(struct inet6_dev *idev);
117 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
118 static void ipv6_regen_rndid(unsigned long data);
120 static int desync_factor = MAX_DESYNC_FACTOR * HZ;
123 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
124 static int ipv6_count_addresses(struct inet6_dev *idev);
127 * Configured unicast address hash table
129 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
130 static DEFINE_SPINLOCK(addrconf_hash_lock);
132 static void addrconf_verify(unsigned long);
134 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
135 static DEFINE_SPINLOCK(addrconf_verify_lock);
137 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
138 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
140 static void addrconf_type_change(struct net_device *dev,
141 unsigned long event);
142 static int addrconf_ifdown(struct net_device *dev, int how);
144 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
145 static void addrconf_dad_timer(unsigned long data);
146 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
147 static void addrconf_dad_run(struct inet6_dev *idev);
148 static void addrconf_rs_timer(unsigned long data);
149 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
150 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
152 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
153 struct prefix_info *pinfo);
154 static int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
155 struct net_device *dev);
157 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
159 static struct ipv6_devconf ipv6_devconf __read_mostly = {
161 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
162 .mtu6 = IPV6_MIN_MTU,
164 .accept_redirects = 1,
166 .force_mld_version = 0,
168 .rtr_solicits = MAX_RTR_SOLICITATIONS,
169 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
170 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
171 #ifdef CONFIG_IPV6_PRIVACY
173 .temp_valid_lft = TEMP_VALID_LIFETIME,
174 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
175 .regen_max_retry = REGEN_MAX_RETRY,
176 .max_desync_factor = MAX_DESYNC_FACTOR,
178 .max_addresses = IPV6_MAX_ADDRESSES,
179 .accept_ra_defrtr = 1,
180 .accept_ra_pinfo = 1,
181 #ifdef CONFIG_IPV6_ROUTER_PREF
182 .accept_ra_rtr_pref = 1,
183 .rtr_probe_interval = 60 * HZ,
184 #ifdef CONFIG_IPV6_ROUTE_INFO
185 .accept_ra_rt_info_max_plen = 0,
189 .accept_source_route = 0, /* we do not accept RH0 by default. */
194 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
196 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
197 .mtu6 = IPV6_MIN_MTU,
199 .accept_redirects = 1,
202 .rtr_solicits = MAX_RTR_SOLICITATIONS,
203 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
204 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
205 #ifdef CONFIG_IPV6_PRIVACY
207 .temp_valid_lft = TEMP_VALID_LIFETIME,
208 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
209 .regen_max_retry = REGEN_MAX_RETRY,
210 .max_desync_factor = MAX_DESYNC_FACTOR,
212 .max_addresses = IPV6_MAX_ADDRESSES,
213 .accept_ra_defrtr = 1,
214 .accept_ra_pinfo = 1,
215 #ifdef CONFIG_IPV6_ROUTER_PREF
216 .accept_ra_rtr_pref = 1,
217 .rtr_probe_interval = 60 * HZ,
218 #ifdef CONFIG_IPV6_ROUTE_INFO
219 .accept_ra_rt_info_max_plen = 0,
223 .accept_source_route = 0, /* we do not accept RH0 by default. */
228 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
229 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
230 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
231 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
232 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
234 /* Check if a valid qdisc is available */
235 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
237 return !qdisc_tx_is_noop(dev);
240 /* Check if a route is valid prefix route */
241 static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
243 return ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0);
246 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
248 if (del_timer(&ifp->timer))
252 enum addrconf_timer_t {
258 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
259 enum addrconf_timer_t what,
262 if (!del_timer(&ifp->timer))
267 ifp->timer.function = addrconf_dad_timer;
270 ifp->timer.function = addrconf_rs_timer;
275 ifp->timer.expires = jiffies + when;
276 add_timer(&ifp->timer);
279 static int snmp6_alloc_dev(struct inet6_dev *idev)
281 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
282 sizeof(struct ipstats_mib)) < 0)
284 if (snmp_mib_init((void __percpu **)idev->stats.icmpv6,
285 sizeof(struct icmpv6_mib)) < 0)
287 if (snmp_mib_init((void __percpu **)idev->stats.icmpv6msg,
288 sizeof(struct icmpv6msg_mib)) < 0)
294 snmp_mib_free((void __percpu **)idev->stats.icmpv6);
296 snmp_mib_free((void __percpu **)idev->stats.ipv6);
301 static void snmp6_free_dev(struct inet6_dev *idev)
303 snmp_mib_free((void __percpu **)idev->stats.icmpv6msg);
304 snmp_mib_free((void __percpu **)idev->stats.icmpv6);
305 snmp_mib_free((void __percpu **)idev->stats.ipv6);
308 /* Nobody refers to this device, we may destroy it. */
310 static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
312 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
316 void in6_dev_finish_destroy(struct inet6_dev *idev)
318 struct net_device *dev = idev->dev;
320 WARN_ON(!list_empty(&idev->addr_list));
321 WARN_ON(idev->mc_list != NULL);
323 #ifdef NET_REFCNT_DEBUG
324 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
328 pr_warning("Freeing alive inet6 device %p\n", idev);
331 snmp6_free_dev(idev);
332 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
335 EXPORT_SYMBOL(in6_dev_finish_destroy);
337 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
339 struct inet6_dev *ndev;
343 if (dev->mtu < IPV6_MIN_MTU)
346 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
351 rwlock_init(&ndev->lock);
353 INIT_LIST_HEAD(&ndev->addr_list);
355 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
356 ndev->cnf.mtu6 = dev->mtu;
357 ndev->cnf.sysctl = NULL;
358 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
359 if (ndev->nd_parms == NULL) {
363 if (ndev->cnf.forwarding)
364 dev_disable_lro(dev);
365 /* We refer to the device */
368 if (snmp6_alloc_dev(ndev) < 0) {
370 "%s(): cannot allocate memory for statistics; dev=%s.\n",
371 __func__, dev->name));
372 neigh_parms_release(&nd_tbl, ndev->nd_parms);
374 in6_dev_finish_destroy(ndev);
378 if (snmp6_register_dev(ndev) < 0) {
380 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
381 __func__, dev->name));
382 neigh_parms_release(&nd_tbl, ndev->nd_parms);
384 in6_dev_finish_destroy(ndev);
388 /* One reference from device. We must do this before
389 * we invoke __ipv6_regen_rndid().
393 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
394 ndev->cnf.accept_dad = -1;
396 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
397 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
399 "%s: Disabled Multicast RS\n",
401 ndev->cnf.rtr_solicits = 0;
405 #ifdef CONFIG_IPV6_PRIVACY
406 INIT_LIST_HEAD(&ndev->tempaddr_list);
407 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
408 if ((dev->flags&IFF_LOOPBACK) ||
409 dev->type == ARPHRD_TUNNEL ||
410 dev->type == ARPHRD_TUNNEL6 ||
411 dev->type == ARPHRD_SIT ||
412 dev->type == ARPHRD_NONE) {
414 "%s: Disabled Privacy Extensions\n",
416 ndev->cnf.use_tempaddr = -1;
419 ipv6_regen_rndid((unsigned long) ndev);
423 if (netif_running(dev) && addrconf_qdisc_ok(dev))
424 ndev->if_flags |= IF_READY;
426 ipv6_mc_init_dev(ndev);
427 ndev->tstamp = jiffies;
428 addrconf_sysctl_register(ndev);
429 /* protected by rtnl_lock */
430 rcu_assign_pointer(dev->ip6_ptr, ndev);
432 /* Join all-node multicast group */
433 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
438 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
440 struct inet6_dev *idev;
444 idev = __in6_dev_get(dev);
446 idev = ipv6_add_dev(dev);
451 if (dev->flags&IFF_UP)
457 static void dev_forward_change(struct inet6_dev *idev)
459 struct net_device *dev;
460 struct inet6_ifaddr *ifa;
465 if (idev->cnf.forwarding)
466 dev_disable_lro(dev);
467 if (dev && (dev->flags & IFF_MULTICAST)) {
468 if (idev->cnf.forwarding)
469 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
471 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
474 list_for_each_entry(ifa, &idev->addr_list, if_list) {
475 if (ifa->flags&IFA_F_TENTATIVE)
477 if (idev->cnf.forwarding)
478 addrconf_join_anycast(ifa);
480 addrconf_leave_anycast(ifa);
485 static void addrconf_forward_change(struct net *net, __s32 newf)
487 struct net_device *dev;
488 struct inet6_dev *idev;
491 for_each_netdev_rcu(net, dev) {
492 idev = __in6_dev_get(dev);
494 int changed = (!idev->cnf.forwarding) ^ (!newf);
495 idev->cnf.forwarding = newf;
497 dev_forward_change(idev);
503 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
507 net = (struct net *)table->extra2;
508 if (p == &net->ipv6.devconf_dflt->forwarding)
511 if (!rtnl_trylock()) {
512 /* Restore the original values before restarting */
514 return restart_syscall();
517 if (p == &net->ipv6.devconf_all->forwarding) {
518 __s32 newf = net->ipv6.devconf_all->forwarding;
519 net->ipv6.devconf_dflt->forwarding = newf;
520 addrconf_forward_change(net, newf);
521 } else if ((!*p) ^ (!old))
522 dev_forward_change((struct inet6_dev *)table->extra1);
526 rt6_purge_dflt_routers(net);
531 static void inet6_ifa_finish_destroy_rcu(struct rcu_head *head)
533 struct inet6_ifaddr *ifp = container_of(head, struct inet6_ifaddr, rcu);
537 /* Nobody refers to this ifaddr, destroy it */
538 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
540 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
542 #ifdef NET_REFCNT_DEBUG
543 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
546 in6_dev_put(ifp->idev);
548 if (del_timer(&ifp->timer))
549 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
552 pr_warning("Freeing alive inet6 address %p\n", ifp);
555 dst_release(&ifp->rt->u.dst);
557 call_rcu(&ifp->rcu, inet6_ifa_finish_destroy_rcu);
561 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
564 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
567 * Each device address list is sorted in order of scope -
568 * global before linklocal.
570 list_for_each(p, &idev->addr_list) {
571 struct inet6_ifaddr *ifa
572 = list_entry(p, struct inet6_ifaddr, if_list);
573 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
577 list_add(&ifp->if_list, p);
580 static u32 ipv6_addr_hash(const struct in6_addr *addr)
583 * We perform the hash function over the last 64 bits of the address
584 * This will include the IEEE address token on links that support it.
586 return jhash_2words(addr->s6_addr32[2], addr->s6_addr32[3], 0)
587 & (IN6_ADDR_HSIZE - 1);
590 /* On success it returns ifp with increased reference count */
592 static struct inet6_ifaddr *
593 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
594 int scope, u32 flags)
596 struct inet6_ifaddr *ifa = NULL;
600 int addr_type = ipv6_addr_type(addr);
602 if (addr_type == IPV6_ADDR_ANY ||
603 addr_type & IPV6_ADDR_MULTICAST ||
604 (!(idev->dev->flags & IFF_LOOPBACK) &&
605 addr_type & IPV6_ADDR_LOOPBACK))
606 return ERR_PTR(-EADDRNOTAVAIL);
610 err = -ENODEV; /*XXX*/
614 if (idev->cnf.disable_ipv6) {
619 spin_lock(&addrconf_hash_lock);
621 /* Ignore adding duplicate addresses on an interface */
622 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
623 ADBG(("ipv6_add_addr: already assigned\n"));
628 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
631 ADBG(("ipv6_add_addr: malloc failed\n"));
636 rt = addrconf_dst_alloc(idev, addr, 0);
642 ipv6_addr_copy(&ifa->addr, addr);
644 spin_lock_init(&ifa->lock);
645 init_timer(&ifa->timer);
646 INIT_HLIST_NODE(&ifa->addr_lst);
647 ifa->timer.data = (unsigned long) ifa;
649 ifa->prefix_len = pfxlen;
650 ifa->flags = flags | IFA_F_TENTATIVE;
651 ifa->cstamp = ifa->tstamp = jiffies;
656 * part one of RFC 4429, section 3.3
657 * We should not configure an address as
658 * optimistic if we do not yet know the link
659 * layer address of our nexhop router
662 if (rt->rt6i_nexthop == NULL)
663 ifa->flags &= ~IFA_F_OPTIMISTIC;
670 /* Add to big hash table */
671 hash = ipv6_addr_hash(addr);
673 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
675 spin_unlock(&addrconf_hash_lock);
677 write_lock(&idev->lock);
678 /* Add to inet6_dev unicast addr list. */
679 ipv6_link_dev_addr(idev, ifa);
681 #ifdef CONFIG_IPV6_PRIVACY
682 if (ifa->flags&IFA_F_TEMPORARY) {
683 list_add(&ifa->tmp_list, &idev->tempaddr_list);
689 write_unlock(&idev->lock);
691 rcu_read_unlock_bh();
693 if (likely(err == 0))
694 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
702 spin_unlock(&addrconf_hash_lock);
706 /* This function wants to get referenced ifp and releases it before return */
708 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
710 struct inet6_ifaddr *ifa, *ifn;
711 struct inet6_dev *idev = ifp->idev;
713 int deleted = 0, onlink = 0;
714 unsigned long expires = jiffies;
716 hash = ipv6_addr_hash(&ifp->addr);
720 spin_lock_bh(&addrconf_hash_lock);
721 hlist_del_init_rcu(&ifp->addr_lst);
723 spin_unlock_bh(&addrconf_hash_lock);
725 write_lock_bh(&idev->lock);
726 #ifdef CONFIG_IPV6_PRIVACY
727 if (ifp->flags&IFA_F_TEMPORARY) {
728 list_del(&ifp->tmp_list);
730 in6_ifa_put(ifp->ifpub);
737 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
739 list_del_init(&ifp->if_list);
742 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
746 } else if (ifp->flags & IFA_F_PERMANENT) {
747 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
749 if (ifa->flags & IFA_F_PERMANENT) {
754 unsigned long lifetime;
759 spin_lock(&ifa->lock);
761 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
763 * Note: Because this address is
764 * not permanent, lifetime <
765 * LONG_MAX / HZ here.
767 if (time_before(expires,
768 ifa->tstamp + lifetime * HZ))
769 expires = ifa->tstamp + lifetime * HZ;
770 spin_unlock(&ifa->lock);
775 write_unlock_bh(&idev->lock);
777 addrconf_del_timer(ifp);
779 ipv6_ifa_notify(RTM_DELADDR, ifp);
781 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
784 * Purge or update corresponding prefix
786 * 1) we don't purge prefix here if address was not permanent.
787 * prefix is managed by its own lifetime.
788 * 2) if there're no addresses, delete prefix.
789 * 3) if there're still other permanent address(es),
790 * corresponding prefix is still permanent.
791 * 4) otherwise, update prefix lifetime to the
792 * longest valid lifetime among the corresponding
793 * addresses on the device.
794 * Note: subsequent RA will update lifetime.
798 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
799 struct in6_addr prefix;
801 struct net *net = dev_net(ifp->idev->dev);
802 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
803 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
805 if (rt && addrconf_is_prefix_route(rt)) {
809 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
810 rt->rt6i_expires = expires;
811 rt->rt6i_flags |= RTF_EXPIRES;
814 dst_release(&rt->u.dst);
820 #ifdef CONFIG_IPV6_PRIVACY
821 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
823 struct inet6_dev *idev = ifp->idev;
824 struct in6_addr addr, *tmpaddr;
825 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
826 unsigned long regen_advance;
832 write_lock(&idev->lock);
834 spin_lock_bh(&ift->lock);
835 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
836 spin_unlock_bh(&ift->lock);
843 if (idev->cnf.use_tempaddr <= 0) {
844 write_unlock(&idev->lock);
846 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
851 spin_lock_bh(&ifp->lock);
852 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
853 idev->cnf.use_tempaddr = -1; /*XXX*/
854 spin_unlock_bh(&ifp->lock);
855 write_unlock(&idev->lock);
857 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
863 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
864 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
865 spin_unlock_bh(&ifp->lock);
866 write_unlock(&idev->lock);
868 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
874 memcpy(&addr.s6_addr[8], idev->rndid, 8);
875 tmp_valid_lft = min_t(__u32,
877 idev->cnf.temp_valid_lft);
878 tmp_prefered_lft = min_t(__u32,
880 idev->cnf.temp_prefered_lft - desync_factor / HZ);
881 tmp_plen = ifp->prefix_len;
882 max_addresses = idev->cnf.max_addresses;
883 tmp_cstamp = ifp->cstamp;
884 tmp_tstamp = ifp->tstamp;
885 spin_unlock_bh(&ifp->lock);
887 regen_advance = idev->cnf.regen_max_retry *
888 idev->cnf.dad_transmits *
889 idev->nd_parms->retrans_time / HZ;
890 write_unlock(&idev->lock);
892 /* A temporary address is created only if this calculated Preferred
893 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
894 * an implementation must not create a temporary address with a zero
895 * Preferred Lifetime.
897 if (tmp_prefered_lft <= regen_advance) {
904 addr_flags = IFA_F_TEMPORARY;
905 /* set in addrconf_prefix_rcv() */
906 if (ifp->flags & IFA_F_OPTIMISTIC)
907 addr_flags |= IFA_F_OPTIMISTIC;
909 ift = !max_addresses ||
910 ipv6_count_addresses(idev) < max_addresses ?
911 ipv6_add_addr(idev, &addr, tmp_plen,
912 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
914 if (!ift || IS_ERR(ift)) {
918 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
920 write_lock(&idev->lock);
924 spin_lock_bh(&ift->lock);
926 ift->valid_lft = tmp_valid_lft;
927 ift->prefered_lft = tmp_prefered_lft;
928 ift->cstamp = tmp_cstamp;
929 ift->tstamp = tmp_tstamp;
930 spin_unlock_bh(&ift->lock);
932 addrconf_dad_start(ift, 0);
941 * Choose an appropriate source address (RFC3484)
944 IPV6_SADDR_RULE_INIT = 0,
945 IPV6_SADDR_RULE_LOCAL,
946 IPV6_SADDR_RULE_SCOPE,
947 IPV6_SADDR_RULE_PREFERRED,
948 #ifdef CONFIG_IPV6_MIP6
952 IPV6_SADDR_RULE_LABEL,
953 #ifdef CONFIG_IPV6_PRIVACY
954 IPV6_SADDR_RULE_PRIVACY,
956 IPV6_SADDR_RULE_ORCHID,
957 IPV6_SADDR_RULE_PREFIX,
961 struct ipv6_saddr_score {
964 struct inet6_ifaddr *ifa;
965 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
970 struct ipv6_saddr_dst {
971 const struct in6_addr *addr;
978 static inline int ipv6_saddr_preferred(int type)
980 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
985 static int ipv6_get_saddr_eval(struct net *net,
986 struct ipv6_saddr_score *score,
987 struct ipv6_saddr_dst *dst,
992 if (i <= score->rule) {
994 case IPV6_SADDR_RULE_SCOPE:
995 ret = score->scopedist;
997 case IPV6_SADDR_RULE_PREFIX:
998 ret = score->matchlen;
1001 ret = !!test_bit(i, score->scorebits);
1007 case IPV6_SADDR_RULE_INIT:
1008 /* Rule 0: remember if hiscore is not ready yet */
1011 case IPV6_SADDR_RULE_LOCAL:
1012 /* Rule 1: Prefer same address */
1013 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1015 case IPV6_SADDR_RULE_SCOPE:
1016 /* Rule 2: Prefer appropriate scope
1021 * ---+--+-+---> scope
1023 * | d is scope of the destination.
1025 * | \ <- smaller scope is better if
1026 * B-15 | \ if scope is enough for destinaion.
1027 * | ret = B - scope (-1 <= scope >= d <= 15).
1029 * |/ <- greater is better
1030 * -C / if scope is not enough for destination.
1031 * /| ret = scope - C (-1 <= d < scope <= 15).
1033 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1034 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1035 * Assume B = 0 and we get C > 29.
1037 ret = __ipv6_addr_src_scope(score->addr_type);
1038 if (ret >= dst->scope)
1041 ret -= 128; /* 30 is enough */
1042 score->scopedist = ret;
1044 case IPV6_SADDR_RULE_PREFERRED:
1045 /* Rule 3: Avoid deprecated and optimistic addresses */
1046 ret = ipv6_saddr_preferred(score->addr_type) ||
1047 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1049 #ifdef CONFIG_IPV6_MIP6
1050 case IPV6_SADDR_RULE_HOA:
1052 /* Rule 4: Prefer home address */
1053 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1054 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1058 case IPV6_SADDR_RULE_OIF:
1059 /* Rule 5: Prefer outgoing interface */
1060 ret = (!dst->ifindex ||
1061 dst->ifindex == score->ifa->idev->dev->ifindex);
1063 case IPV6_SADDR_RULE_LABEL:
1064 /* Rule 6: Prefer matching label */
1065 ret = ipv6_addr_label(net,
1066 &score->ifa->addr, score->addr_type,
1067 score->ifa->idev->dev->ifindex) == dst->label;
1069 #ifdef CONFIG_IPV6_PRIVACY
1070 case IPV6_SADDR_RULE_PRIVACY:
1072 /* Rule 7: Prefer public address
1073 * Note: prefer temprary address if use_tempaddr >= 2
1075 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1076 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1077 score->ifa->idev->cnf.use_tempaddr >= 2;
1078 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1082 case IPV6_SADDR_RULE_ORCHID:
1083 /* Rule 8-: Prefer ORCHID vs ORCHID or
1084 * non-ORCHID vs non-ORCHID
1086 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1087 ipv6_addr_orchid(dst->addr));
1089 case IPV6_SADDR_RULE_PREFIX:
1090 /* Rule 8: Use longest matching prefix */
1091 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1099 __set_bit(i, score->scorebits);
1105 int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
1106 const struct in6_addr *daddr, unsigned int prefs,
1107 struct in6_addr *saddr)
1109 struct ipv6_saddr_score scores[2],
1110 *score = &scores[0], *hiscore = &scores[1];
1111 struct ipv6_saddr_dst dst;
1112 struct net_device *dev;
1115 dst_type = __ipv6_addr_type(daddr);
1117 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1118 dst.scope = __ipv6_addr_src_scope(dst_type);
1119 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1123 hiscore->ifa = NULL;
1127 for_each_netdev_rcu(net, dev) {
1128 struct inet6_dev *idev;
1130 /* Candidate Source Address (section 4)
1131 * - multicast and link-local destination address,
1132 * the set of candidate source address MUST only
1133 * include addresses assigned to interfaces
1134 * belonging to the same link as the outgoing
1136 * (- For site-local destination addresses, the
1137 * set of candidate source addresses MUST only
1138 * include addresses assigned to interfaces
1139 * belonging to the same site as the outgoing
1142 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1143 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1144 dst.ifindex && dev->ifindex != dst.ifindex)
1147 idev = __in6_dev_get(dev);
1151 read_lock_bh(&idev->lock);
1152 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1156 * - Tentative Address (RFC2462 section 5.4)
1157 * - A tentative address is not considered
1158 * "assigned to an interface" in the traditional
1159 * sense, unless it is also flagged as optimistic.
1160 * - Candidate Source Address (section 4)
1161 * - In any case, anycast addresses, multicast
1162 * addresses, and the unspecified address MUST
1163 * NOT be included in a candidate set.
1165 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1166 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1169 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1171 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1172 score->addr_type & IPV6_ADDR_MULTICAST)) {
1173 LIMIT_NETDEBUG(KERN_DEBUG
1174 "ADDRCONF: unspecified / multicast address "
1175 "assigned as unicast address on %s",
1181 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1183 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1184 int minihiscore, miniscore;
1186 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1187 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1189 if (minihiscore > miniscore) {
1190 if (i == IPV6_SADDR_RULE_SCOPE &&
1191 score->scopedist > 0) {
1194 * each remaining entry
1195 * has too small (not enough)
1196 * scope, because ifa entries
1197 * are sorted by their scope
1203 } else if (minihiscore < miniscore) {
1205 in6_ifa_put(hiscore->ifa);
1207 in6_ifa_hold(score->ifa);
1209 swap(hiscore, score);
1211 /* restore our iterator */
1212 score->ifa = hiscore->ifa;
1219 read_unlock_bh(&idev->lock);
1224 return -EADDRNOTAVAIL;
1226 ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1227 in6_ifa_put(hiscore->ifa);
1230 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1232 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1233 unsigned char banned_flags)
1235 struct inet6_dev *idev;
1236 int err = -EADDRNOTAVAIL;
1239 idev = __in6_dev_get(dev);
1241 struct inet6_ifaddr *ifp;
1243 read_lock_bh(&idev->lock);
1244 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1245 if (ifp->scope == IFA_LINK &&
1246 !(ifp->flags & banned_flags)) {
1247 ipv6_addr_copy(addr, &ifp->addr);
1252 read_unlock_bh(&idev->lock);
1258 static int ipv6_count_addresses(struct inet6_dev *idev)
1261 struct inet6_ifaddr *ifp;
1263 read_lock_bh(&idev->lock);
1264 list_for_each_entry(ifp, &idev->addr_list, if_list)
1266 read_unlock_bh(&idev->lock);
1270 int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1271 struct net_device *dev, int strict)
1273 struct inet6_ifaddr *ifp = NULL;
1274 struct hlist_node *node;
1275 unsigned int hash = ipv6_addr_hash(addr);
1278 hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1279 if (!net_eq(dev_net(ifp->idev->dev), net))
1281 if (ipv6_addr_equal(&ifp->addr, addr) &&
1282 !(ifp->flags&IFA_F_TENTATIVE)) {
1283 if (dev == NULL || ifp->idev->dev == dev ||
1284 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1288 rcu_read_unlock_bh();
1292 EXPORT_SYMBOL(ipv6_chk_addr);
1295 int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1296 struct net_device *dev)
1298 struct inet6_ifaddr *ifp;
1299 struct hlist_node *node;
1300 unsigned int hash = ipv6_addr_hash(addr);
1302 hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1303 if (!net_eq(dev_net(ifp->idev->dev), net))
1305 if (ipv6_addr_equal(&ifp->addr, addr)) {
1306 if (dev == NULL || ifp->idev->dev == dev)
1313 int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev)
1315 struct inet6_dev *idev;
1316 struct inet6_ifaddr *ifa;
1321 idev = __in6_dev_get(dev);
1323 read_lock_bh(&idev->lock);
1324 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1325 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1330 read_unlock_bh(&idev->lock);
1336 EXPORT_SYMBOL(ipv6_chk_prefix);
1338 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1339 struct net_device *dev, int strict)
1341 struct inet6_ifaddr *ifp = NULL;
1342 struct hlist_node *node;
1343 unsigned int hash = ipv6_addr_hash(addr);
1346 hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1347 if (!net_eq(dev_net(ifp->idev->dev), net))
1349 if (ipv6_addr_equal(&ifp->addr, addr)) {
1350 if (dev == NULL || ifp->idev->dev == dev ||
1351 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1357 rcu_read_unlock_bh();
1362 /* Gets referenced address, destroys ifaddr */
1364 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1366 if (ifp->flags&IFA_F_PERMANENT) {
1367 spin_lock_bh(&ifp->lock);
1368 addrconf_del_timer(ifp);
1369 ifp->flags |= IFA_F_TENTATIVE;
1371 ifp->flags |= IFA_F_DADFAILED;
1372 spin_unlock_bh(&ifp->lock);
1374 ipv6_ifa_notify(0, ifp);
1376 #ifdef CONFIG_IPV6_PRIVACY
1377 } else if (ifp->flags&IFA_F_TEMPORARY) {
1378 struct inet6_ifaddr *ifpub;
1379 spin_lock_bh(&ifp->lock);
1382 in6_ifa_hold(ifpub);
1383 spin_unlock_bh(&ifp->lock);
1384 ipv6_create_tempaddr(ifpub, ifp);
1387 spin_unlock_bh(&ifp->lock);
1395 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1397 struct inet6_dev *idev = ifp->idev;
1399 if (net_ratelimit())
1400 printk(KERN_INFO "%s: IPv6 duplicate address %pI6c detected!\n",
1401 ifp->idev->dev->name, &ifp->addr);
1403 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1404 struct in6_addr addr;
1406 addr.s6_addr32[0] = htonl(0xfe800000);
1407 addr.s6_addr32[1] = 0;
1409 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1410 ipv6_addr_equal(&ifp->addr, &addr)) {
1411 /* DAD failed for link-local based on MAC address */
1412 idev->cnf.disable_ipv6 = 1;
1414 printk(KERN_INFO "%s: IPv6 being disabled!\n",
1415 ifp->idev->dev->name);
1419 addrconf_dad_stop(ifp, 1);
1422 /* Join to solicited addr multicast group. */
1424 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1426 struct in6_addr maddr;
1428 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1431 addrconf_addr_solict_mult(addr, &maddr);
1432 ipv6_dev_mc_inc(dev, &maddr);
1435 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1437 struct in6_addr maddr;
1439 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1442 addrconf_addr_solict_mult(addr, &maddr);
1443 __ipv6_dev_mc_dec(idev, &maddr);
1446 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1448 struct in6_addr addr;
1449 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1450 if (ipv6_addr_any(&addr))
1452 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1455 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1457 struct in6_addr addr;
1458 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1459 if (ipv6_addr_any(&addr))
1461 __ipv6_dev_ac_dec(ifp->idev, &addr);
1464 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1466 if (dev->addr_len != ETH_ALEN)
1468 memcpy(eui, dev->dev_addr, 3);
1469 memcpy(eui + 5, dev->dev_addr + 3, 3);
1472 * The zSeries OSA network cards can be shared among various
1473 * OS instances, but the OSA cards have only one MAC address.
1474 * This leads to duplicate address conflicts in conjunction
1475 * with IPv6 if more than one instance uses the same card.
1477 * The driver for these cards can deliver a unique 16-bit
1478 * identifier for each instance sharing the same card. It is
1479 * placed instead of 0xFFFE in the interface identifier. The
1480 * "u" bit of the interface identifier is not inverted in this
1481 * case. Hence the resulting interface identifier has local
1482 * scope according to RFC2373.
1485 eui[3] = (dev->dev_id >> 8) & 0xFF;
1486 eui[4] = dev->dev_id & 0xFF;
1495 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1497 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1498 if (dev->addr_len != ARCNET_ALEN)
1501 eui[7] = *(u8*)dev->dev_addr;
1505 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1507 if (dev->addr_len != INFINIBAND_ALEN)
1509 memcpy(eui, dev->dev_addr + 12, 8);
1514 int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1518 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1519 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1520 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1521 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1522 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1523 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1527 memcpy(eui + 4, &addr, 4);
1530 EXPORT_SYMBOL(__ipv6_isatap_ifid);
1532 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1534 if (dev->priv_flags & IFF_ISATAP)
1535 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1539 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1541 switch (dev->type) {
1544 case ARPHRD_IEEE802_TR:
1545 return addrconf_ifid_eui48(eui, dev);
1547 return addrconf_ifid_arcnet(eui, dev);
1548 case ARPHRD_INFINIBAND:
1549 return addrconf_ifid_infiniband(eui, dev);
1551 return addrconf_ifid_sit(eui, dev);
1556 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1559 struct inet6_ifaddr *ifp;
1561 read_lock_bh(&idev->lock);
1562 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1563 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1564 memcpy(eui, ifp->addr.s6_addr+8, 8);
1569 read_unlock_bh(&idev->lock);
1573 #ifdef CONFIG_IPV6_PRIVACY
1574 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1575 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1578 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1579 idev->rndid[0] &= ~0x02;
1582 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1583 * check if generated address is not inappropriate
1585 * - Reserved subnet anycast (RFC 2526)
1586 * 11111101 11....11 1xxxxxxx
1587 * - ISATAP (RFC4214) 6.1
1588 * 00-00-5E-FE-xx-xx-xx-xx
1590 * - XXX: already assigned to an address on the device
1592 if (idev->rndid[0] == 0xfd &&
1593 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1594 (idev->rndid[7]&0x80))
1596 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1597 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1599 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1606 static void ipv6_regen_rndid(unsigned long data)
1608 struct inet6_dev *idev = (struct inet6_dev *) data;
1609 unsigned long expires;
1612 write_lock_bh(&idev->lock);
1617 if (__ipv6_regen_rndid(idev) < 0)
1621 idev->cnf.temp_prefered_lft * HZ -
1622 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1623 if (time_before(expires, jiffies)) {
1625 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1630 if (!mod_timer(&idev->regen_timer, expires))
1634 write_unlock_bh(&idev->lock);
1635 rcu_read_unlock_bh();
1639 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1642 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1643 ret = __ipv6_regen_rndid(idev);
1653 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1654 unsigned long expires, u32 flags)
1656 struct fib6_config cfg = {
1657 .fc_table = RT6_TABLE_PREFIX,
1658 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1659 .fc_ifindex = dev->ifindex,
1660 .fc_expires = expires,
1662 .fc_flags = RTF_UP | flags,
1663 .fc_nlinfo.nl_net = dev_net(dev),
1664 .fc_protocol = RTPROT_KERNEL,
1667 ipv6_addr_copy(&cfg.fc_dst, pfx);
1669 /* Prevent useless cloning on PtP SIT.
1670 This thing is done here expecting that the whole
1671 class of non-broadcast devices need not cloning.
1673 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1674 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1675 cfg.fc_flags |= RTF_NONEXTHOP;
1678 ip6_route_add(&cfg);
1681 /* Create "default" multicast route to the interface */
1683 static void addrconf_add_mroute(struct net_device *dev)
1685 struct fib6_config cfg = {
1686 .fc_table = RT6_TABLE_LOCAL,
1687 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1688 .fc_ifindex = dev->ifindex,
1691 .fc_nlinfo.nl_net = dev_net(dev),
1694 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1696 ip6_route_add(&cfg);
1699 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1700 static void sit_route_add(struct net_device *dev)
1702 struct fib6_config cfg = {
1703 .fc_table = RT6_TABLE_MAIN,
1704 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1705 .fc_ifindex = dev->ifindex,
1707 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1708 .fc_nlinfo.nl_net = dev_net(dev),
1711 /* prefix length - 96 bits "::d.d.d.d" */
1712 ip6_route_add(&cfg);
1716 static void addrconf_add_lroute(struct net_device *dev)
1718 struct in6_addr addr;
1720 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1721 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1724 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1726 struct inet6_dev *idev;
1730 idev = ipv6_find_idev(dev);
1734 /* Add default multicast route */
1735 addrconf_add_mroute(dev);
1737 /* Add link local route */
1738 addrconf_add_lroute(dev);
1742 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1744 struct prefix_info *pinfo;
1748 struct inet6_dev *in6_dev;
1749 struct net *net = dev_net(dev);
1751 pinfo = (struct prefix_info *) opt;
1753 if (len < sizeof(struct prefix_info)) {
1754 ADBG(("addrconf: prefix option too short\n"));
1759 * Validation checks ([ADDRCONF], page 19)
1762 addr_type = ipv6_addr_type(&pinfo->prefix);
1764 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1767 valid_lft = ntohl(pinfo->valid);
1768 prefered_lft = ntohl(pinfo->prefered);
1770 if (prefered_lft > valid_lft) {
1771 if (net_ratelimit())
1772 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1776 in6_dev = in6_dev_get(dev);
1778 if (in6_dev == NULL) {
1779 if (net_ratelimit())
1780 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1785 * Two things going on here:
1786 * 1) Add routes for on-link prefixes
1787 * 2) Configure prefixes with the auto flag set
1790 if (pinfo->onlink) {
1791 struct rt6_info *rt;
1792 unsigned long rt_expires;
1794 /* Avoid arithmetic overflow. Really, we could
1795 * save rt_expires in seconds, likely valid_lft,
1796 * but it would require division in fib gc, that it
1800 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1802 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
1804 if (addrconf_finite_timeout(rt_expires))
1807 rt = rt6_lookup(net, &pinfo->prefix, NULL,
1810 if (rt && addrconf_is_prefix_route(rt)) {
1811 /* Autoconf prefix route */
1812 if (valid_lft == 0) {
1815 } else if (addrconf_finite_timeout(rt_expires)) {
1817 rt->rt6i_expires = jiffies + rt_expires;
1818 rt->rt6i_flags |= RTF_EXPIRES;
1820 rt->rt6i_flags &= ~RTF_EXPIRES;
1821 rt->rt6i_expires = 0;
1823 } else if (valid_lft) {
1824 clock_t expires = 0;
1825 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1826 if (addrconf_finite_timeout(rt_expires)) {
1828 flags |= RTF_EXPIRES;
1829 expires = jiffies_to_clock_t(rt_expires);
1831 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1832 dev, expires, flags);
1835 dst_release(&rt->u.dst);
1838 /* Try to figure out our local address for this prefix */
1840 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1841 struct inet6_ifaddr * ifp;
1842 struct in6_addr addr;
1843 int create = 0, update_lft = 0;
1845 if (pinfo->prefix_len == 64) {
1846 memcpy(&addr, &pinfo->prefix, 8);
1847 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1848 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1849 in6_dev_put(in6_dev);
1854 if (net_ratelimit())
1855 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1857 in6_dev_put(in6_dev);
1862 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1864 if (ifp == NULL && valid_lft) {
1865 int max_addresses = in6_dev->cnf.max_addresses;
1868 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1869 if (in6_dev->cnf.optimistic_dad &&
1870 !net->ipv6.devconf_all->forwarding)
1871 addr_flags = IFA_F_OPTIMISTIC;
1874 /* Do not allow to create too much of autoconfigured
1875 * addresses; this would be too easy way to crash kernel.
1877 if (!max_addresses ||
1878 ipv6_count_addresses(in6_dev) < max_addresses)
1879 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1880 addr_type&IPV6_ADDR_SCOPE_MASK,
1883 if (!ifp || IS_ERR(ifp)) {
1884 in6_dev_put(in6_dev);
1888 update_lft = create = 1;
1889 ifp->cstamp = jiffies;
1890 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1896 #ifdef CONFIG_IPV6_PRIVACY
1897 struct inet6_ifaddr *ift;
1901 /* update lifetime (RFC2462 5.5.3 e) */
1902 spin_lock(&ifp->lock);
1904 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1905 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1908 if (!update_lft && stored_lft) {
1909 if (valid_lft > MIN_VALID_LIFETIME ||
1910 valid_lft > stored_lft)
1912 else if (stored_lft <= MIN_VALID_LIFETIME) {
1913 /* valid_lft <= stored_lft is always true */
1915 * RFC 4862 Section 5.5.3e:
1916 * "Note that the preferred lifetime of
1917 * the corresponding address is always
1918 * reset to the Preferred Lifetime in
1919 * the received Prefix Information
1920 * option, regardless of whether the
1921 * valid lifetime is also reset or
1924 * So if the preferred lifetime in
1925 * this advertisement is different
1926 * than what we have stored, but the
1927 * valid lifetime is invalid, just
1928 * reset prefered_lft.
1930 * We must set the valid lifetime
1931 * to the stored lifetime since we'll
1932 * be updating the timestamp below,
1933 * else we'll set it back to the
1936 if (prefered_lft != ifp->prefered_lft) {
1937 valid_lft = stored_lft;
1941 valid_lft = MIN_VALID_LIFETIME;
1942 if (valid_lft < prefered_lft)
1943 prefered_lft = valid_lft;
1949 ifp->valid_lft = valid_lft;
1950 ifp->prefered_lft = prefered_lft;
1953 ifp->flags &= ~IFA_F_DEPRECATED;
1954 spin_unlock(&ifp->lock);
1956 if (!(flags&IFA_F_TENTATIVE))
1957 ipv6_ifa_notify(0, ifp);
1959 spin_unlock(&ifp->lock);
1961 #ifdef CONFIG_IPV6_PRIVACY
1962 read_lock_bh(&in6_dev->lock);
1963 /* update all temporary addresses in the list */
1964 list_for_each_entry(ift, &in6_dev->tempaddr_list, tmp_list) {
1966 * When adjusting the lifetimes of an existing
1967 * temporary address, only lower the lifetimes.
1968 * Implementations must not increase the
1969 * lifetimes of an existing temporary address
1970 * when processing a Prefix Information Option.
1972 if (ifp != ift->ifpub)
1975 spin_lock(&ift->lock);
1977 if (ift->valid_lft > valid_lft &&
1978 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1979 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1980 if (ift->prefered_lft > prefered_lft &&
1981 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1982 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1983 spin_unlock(&ift->lock);
1984 if (!(flags&IFA_F_TENTATIVE))
1985 ipv6_ifa_notify(0, ift);
1988 if (create && in6_dev->cnf.use_tempaddr > 0) {
1990 * When a new public address is created as described in [ADDRCONF],
1991 * also create a new temporary address.
1993 read_unlock_bh(&in6_dev->lock);
1994 ipv6_create_tempaddr(ifp, NULL);
1996 read_unlock_bh(&in6_dev->lock);
2003 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2004 in6_dev_put(in6_dev);
2008 * Set destination address.
2009 * Special case for SIT interfaces where we create a new "virtual"
2012 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2014 struct in6_ifreq ireq;
2015 struct net_device *dev;
2021 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2024 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2030 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2031 if (dev->type == ARPHRD_SIT) {
2032 const struct net_device_ops *ops = dev->netdev_ops;
2034 struct ip_tunnel_parm p;
2036 err = -EADDRNOTAVAIL;
2037 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2040 memset(&p, 0, sizeof(p));
2041 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2045 p.iph.protocol = IPPROTO_IPV6;
2047 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2049 if (ops->ndo_do_ioctl) {
2050 mm_segment_t oldfs = get_fs();
2053 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2060 dev = __dev_get_by_name(net, p.name);
2063 err = dev_open(dev);
2074 * Manual configuration of address on an interface
2076 static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx,
2077 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2080 struct inet6_ifaddr *ifp;
2081 struct inet6_dev *idev;
2082 struct net_device *dev;
2086 unsigned long timeout;
2093 /* check the lifetime */
2094 if (!valid_lft || prefered_lft > valid_lft)
2097 dev = __dev_get_by_index(net, ifindex);
2101 if ((idev = addrconf_add_dev(dev)) == NULL)
2104 scope = ipv6_addr_scope(pfx);
2106 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2107 if (addrconf_finite_timeout(timeout)) {
2108 expires = jiffies_to_clock_t(timeout * HZ);
2109 valid_lft = timeout;
2110 flags = RTF_EXPIRES;
2114 ifa_flags |= IFA_F_PERMANENT;
2117 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2118 if (addrconf_finite_timeout(timeout)) {
2120 ifa_flags |= IFA_F_DEPRECATED;
2121 prefered_lft = timeout;
2124 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2127 spin_lock_bh(&ifp->lock);
2128 ifp->valid_lft = valid_lft;
2129 ifp->prefered_lft = prefered_lft;
2130 ifp->tstamp = jiffies;
2131 spin_unlock_bh(&ifp->lock);
2133 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2136 * Note that section 3.1 of RFC 4429 indicates
2137 * that the Optimistic flag should not be set for
2138 * manually configured addresses
2140 addrconf_dad_start(ifp, 0);
2146 return PTR_ERR(ifp);
2149 static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx,
2152 struct inet6_ifaddr *ifp;
2153 struct inet6_dev *idev;
2154 struct net_device *dev;
2159 dev = __dev_get_by_index(net, ifindex);
2163 if ((idev = __in6_dev_get(dev)) == NULL)
2166 read_lock_bh(&idev->lock);
2167 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2168 if (ifp->prefix_len == plen &&
2169 ipv6_addr_equal(pfx, &ifp->addr)) {
2171 read_unlock_bh(&idev->lock);
2175 /* If the last address is deleted administratively,
2176 disable IPv6 on this interface.
2178 if (list_empty(&idev->addr_list))
2179 addrconf_ifdown(idev->dev, 1);
2183 read_unlock_bh(&idev->lock);
2184 return -EADDRNOTAVAIL;
2188 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2190 struct in6_ifreq ireq;
2193 if (!capable(CAP_NET_ADMIN))
2196 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2200 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2201 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2202 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2207 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2209 struct in6_ifreq ireq;
2212 if (!capable(CAP_NET_ADMIN))
2215 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2219 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2220 ireq.ifr6_prefixlen);
2225 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2226 int plen, int scope)
2228 struct inet6_ifaddr *ifp;
2230 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2232 spin_lock_bh(&ifp->lock);
2233 ifp->flags &= ~IFA_F_TENTATIVE;
2234 spin_unlock_bh(&ifp->lock);
2235 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2240 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2241 static void sit_add_v4_addrs(struct inet6_dev *idev)
2243 struct in6_addr addr;
2244 struct net_device *dev;
2245 struct net *net = dev_net(idev->dev);
2250 memset(&addr, 0, sizeof(struct in6_addr));
2251 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2253 if (idev->dev->flags&IFF_POINTOPOINT) {
2254 addr.s6_addr32[0] = htonl(0xfe800000);
2257 scope = IPV6_ADDR_COMPATv4;
2260 if (addr.s6_addr32[3]) {
2261 add_addr(idev, &addr, 128, scope);
2265 for_each_netdev(net, dev) {
2266 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2267 if (in_dev && (dev->flags & IFF_UP)) {
2268 struct in_ifaddr * ifa;
2272 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2275 addr.s6_addr32[3] = ifa->ifa_local;
2277 if (ifa->ifa_scope == RT_SCOPE_LINK)
2279 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2280 if (idev->dev->flags&IFF_POINTOPOINT)
2284 if (idev->dev->flags&IFF_POINTOPOINT)
2289 add_addr(idev, &addr, plen, flag);
2296 static void init_loopback(struct net_device *dev)
2298 struct inet6_dev *idev;
2304 if ((idev = ipv6_find_idev(dev)) == NULL) {
2305 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2309 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2312 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2314 struct inet6_ifaddr * ifp;
2315 u32 addr_flags = IFA_F_PERMANENT;
2317 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2318 if (idev->cnf.optimistic_dad &&
2319 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2320 addr_flags |= IFA_F_OPTIMISTIC;
2324 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2326 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2327 addrconf_dad_start(ifp, 0);
2332 static void addrconf_dev_config(struct net_device *dev)
2334 struct in6_addr addr;
2335 struct inet6_dev * idev;
2339 if ((dev->type != ARPHRD_ETHER) &&
2340 (dev->type != ARPHRD_FDDI) &&
2341 (dev->type != ARPHRD_IEEE802_TR) &&
2342 (dev->type != ARPHRD_ARCNET) &&
2343 (dev->type != ARPHRD_INFINIBAND)) {
2344 /* Alas, we support only Ethernet autoconfiguration. */
2348 idev = addrconf_add_dev(dev);
2352 memset(&addr, 0, sizeof(struct in6_addr));
2353 addr.s6_addr32[0] = htonl(0xFE800000);
2355 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2356 addrconf_add_linklocal(idev, &addr);
2359 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2360 static void addrconf_sit_config(struct net_device *dev)
2362 struct inet6_dev *idev;
2367 * Configure the tunnel with one of our IPv4
2368 * addresses... we should configure all of
2369 * our v4 addrs in the tunnel
2372 if ((idev = ipv6_find_idev(dev)) == NULL) {
2373 printk(KERN_DEBUG "init sit: add_dev failed\n");
2377 if (dev->priv_flags & IFF_ISATAP) {
2378 struct in6_addr addr;
2380 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2381 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2382 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2383 addrconf_add_linklocal(idev, &addr);
2387 sit_add_v4_addrs(idev);
2389 if (dev->flags&IFF_POINTOPOINT) {
2390 addrconf_add_mroute(dev);
2391 addrconf_add_lroute(dev);
2398 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2400 struct in6_addr lladdr;
2402 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2403 addrconf_add_linklocal(idev, &lladdr);
2409 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2411 struct net_device *link_dev;
2412 struct net *net = dev_net(idev->dev);
2414 /* first try to inherit the link-local address from the link device */
2415 if (idev->dev->iflink &&
2416 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2417 if (!ipv6_inherit_linklocal(idev, link_dev))
2420 /* then try to inherit it from any device */
2421 for_each_netdev(net, link_dev) {
2422 if (!ipv6_inherit_linklocal(idev, link_dev))
2425 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2429 * Autoconfigure tunnel with a link-local address so routing protocols,
2430 * DHCPv6, MLD etc. can be run over the virtual link
2433 static void addrconf_ip6_tnl_config(struct net_device *dev)
2435 struct inet6_dev *idev;
2439 idev = addrconf_add_dev(dev);
2441 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2444 ip6_tnl_add_linklocal(idev);
2447 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2450 struct net_device *dev = (struct net_device *) data;
2451 struct inet6_dev *idev = __in6_dev_get(dev);
2452 int run_pending = 0;
2456 case NETDEV_REGISTER:
2457 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2458 idev = ipv6_add_dev(dev);
2460 return notifier_from_errno(-ENOMEM);
2466 if (dev->flags & IFF_SLAVE)
2469 if (event == NETDEV_UP) {
2470 if (!addrconf_qdisc_ok(dev)) {
2471 /* device is not ready yet. */
2473 "ADDRCONF(NETDEV_UP): %s: "
2474 "link is not ready\n",
2479 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2480 idev = ipv6_add_dev(dev);
2483 idev->if_flags |= IF_READY;
2487 if (!addrconf_qdisc_ok(dev)) {
2488 /* device is still not ready. */
2493 if (idev->if_flags & IF_READY)
2494 /* device is already configured. */
2496 idev->if_flags |= IF_READY;
2500 "ADDRCONF(NETDEV_CHANGE): %s: "
2501 "link becomes ready\n",
2507 switch (dev->type) {
2508 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2510 addrconf_sit_config(dev);
2513 case ARPHRD_TUNNEL6:
2514 addrconf_ip6_tnl_config(dev);
2516 case ARPHRD_LOOPBACK:
2521 addrconf_dev_config(dev);
2527 addrconf_dad_run(idev);
2530 * If the MTU changed during the interface down,
2531 * when the interface up, the changed MTU must be
2532 * reflected in the idev as well as routers.
2534 if (idev->cnf.mtu6 != dev->mtu &&
2535 dev->mtu >= IPV6_MIN_MTU) {
2536 rt6_mtu_change(dev, dev->mtu);
2537 idev->cnf.mtu6 = dev->mtu;
2539 idev->tstamp = jiffies;
2540 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2543 * If the changed mtu during down is lower than
2544 * IPV6_MIN_MTU stop IPv6 on this interface.
2546 if (dev->mtu < IPV6_MIN_MTU)
2547 addrconf_ifdown(dev, 1);
2551 case NETDEV_CHANGEMTU:
2552 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2553 rt6_mtu_change(dev, dev->mtu);
2554 idev->cnf.mtu6 = dev->mtu;
2558 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2559 idev = ipv6_add_dev(dev);
2565 * MTU falled under IPV6_MIN_MTU.
2566 * Stop IPv6 on this interface.
2570 case NETDEV_UNREGISTER:
2572 * Remove all addresses from this interface.
2574 addrconf_ifdown(dev, event != NETDEV_DOWN);
2577 case NETDEV_CHANGENAME:
2579 snmp6_unregister_dev(idev);
2580 addrconf_sysctl_unregister(idev);
2581 addrconf_sysctl_register(idev);
2582 err = snmp6_register_dev(idev);
2584 return notifier_from_errno(err);
2588 case NETDEV_PRE_TYPE_CHANGE:
2589 case NETDEV_POST_TYPE_CHANGE:
2590 addrconf_type_change(dev, event);
2598 * addrconf module should be notified of a device going up
2600 static struct notifier_block ipv6_dev_notf = {
2601 .notifier_call = addrconf_notify,
2604 static void addrconf_type_change(struct net_device *dev, unsigned long event)
2606 struct inet6_dev *idev;
2609 idev = __in6_dev_get(dev);
2611 if (event == NETDEV_POST_TYPE_CHANGE)
2612 ipv6_mc_remap(idev);
2613 else if (event == NETDEV_PRE_TYPE_CHANGE)
2614 ipv6_mc_unmap(idev);
2617 static int addrconf_ifdown(struct net_device *dev, int how)
2619 struct net *net = dev_net(dev);
2620 struct inet6_dev *idev;
2621 struct inet6_ifaddr *ifa;
2622 LIST_HEAD(keep_list);
2626 rt6_ifdown(net, dev);
2627 neigh_ifdown(&nd_tbl, dev);
2629 idev = __in6_dev_get(dev);
2634 * Step 1: remove reference to ipv6 device from parent device.
2640 /* protected by rtnl_lock */
2641 rcu_assign_pointer(dev->ip6_ptr, NULL);
2643 /* Step 1.5: remove snmp6 entry */
2644 snmp6_unregister_dev(idev);
2648 write_lock_bh(&idev->lock);
2650 /* Step 2: clear flags for stateless addrconf */
2652 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2654 #ifdef CONFIG_IPV6_PRIVACY
2655 if (how && del_timer(&idev->regen_timer))
2658 /* Step 3: clear tempaddr list */
2659 while (!list_empty(&idev->tempaddr_list)) {
2660 ifa = list_first_entry(&idev->tempaddr_list,
2661 struct inet6_ifaddr, tmp_list);
2662 list_del(&ifa->tmp_list);
2664 write_unlock_bh(&idev->lock);
2665 spin_lock_bh(&ifa->lock);
2668 in6_ifa_put(ifa->ifpub);
2671 spin_unlock_bh(&ifa->lock);
2673 write_lock_bh(&idev->lock);
2677 while (!list_empty(&idev->addr_list)) {
2678 ifa = list_first_entry(&idev->addr_list,
2679 struct inet6_ifaddr, if_list);
2680 addrconf_del_timer(ifa);
2682 /* If just doing link down, and address is permanent
2683 and not link-local, then retain it. */
2685 (ifa->flags&IFA_F_PERMANENT) &&
2686 !(ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL)) {
2687 list_move_tail(&ifa->if_list, &keep_list);
2689 /* If not doing DAD on this address, just keep it. */
2690 if ((dev->flags&(IFF_NOARP|IFF_LOOPBACK)) ||
2691 idev->cnf.accept_dad <= 0 ||
2692 (ifa->flags & IFA_F_NODAD))
2695 /* If it was tentative already, no need to notify */
2696 if (ifa->flags & IFA_F_TENTATIVE)
2699 /* Flag it for later restoration when link comes up */
2700 ifa->flags |= IFA_F_TENTATIVE;
2703 list_del(&ifa->if_list);
2706 write_unlock_bh(&idev->lock);
2708 /* clear hash table */
2709 spin_lock_bh(&addrconf_hash_lock);
2710 hlist_del_init_rcu(&ifa->addr_lst);
2712 spin_unlock_bh(&addrconf_hash_lock);
2714 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2715 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2718 write_lock_bh(&idev->lock);
2721 list_splice(&keep_list, &idev->addr_list);
2723 write_unlock_bh(&idev->lock);
2725 /* Step 5: Discard multicast list */
2727 ipv6_mc_destroy_dev(idev);
2731 idev->tstamp = jiffies;
2733 /* Last: Shot the device (if unregistered) */
2735 addrconf_sysctl_unregister(idev);
2736 neigh_parms_release(&nd_tbl, idev->nd_parms);
2737 neigh_ifdown(&nd_tbl, dev);
2743 static void addrconf_rs_timer(unsigned long data)
2745 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2746 struct inet6_dev *idev = ifp->idev;
2748 read_lock(&idev->lock);
2749 if (idev->dead || !(idev->if_flags & IF_READY))
2752 if (idev->cnf.forwarding)
2755 /* Announcement received after solicitation was sent */
2756 if (idev->if_flags & IF_RA_RCVD)
2759 spin_lock(&ifp->lock);
2760 if (ifp->probes++ < idev->cnf.rtr_solicits) {
2761 /* The wait after the last probe can be shorter */
2762 addrconf_mod_timer(ifp, AC_RS,
2763 (ifp->probes == idev->cnf.rtr_solicits) ?
2764 idev->cnf.rtr_solicit_delay :
2765 idev->cnf.rtr_solicit_interval);
2766 spin_unlock(&ifp->lock);
2768 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2770 spin_unlock(&ifp->lock);
2772 * Note: we do not support deprecated "all on-link"
2773 * assumption any longer.
2775 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2780 read_unlock(&idev->lock);
2785 * Duplicate Address Detection
2787 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2789 unsigned long rand_num;
2790 struct inet6_dev *idev = ifp->idev;
2792 if (ifp->flags & IFA_F_OPTIMISTIC)
2795 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2797 ifp->probes = idev->cnf.dad_transmits;
2798 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2801 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2803 struct inet6_dev *idev = ifp->idev;
2804 struct net_device *dev = idev->dev;
2806 addrconf_join_solict(dev, &ifp->addr);
2808 net_srandom(ifp->addr.s6_addr32[3]);
2810 read_lock_bh(&idev->lock);
2814 spin_lock(&ifp->lock);
2815 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2816 idev->cnf.accept_dad < 1 ||
2817 !(ifp->flags&IFA_F_TENTATIVE) ||
2818 ifp->flags & IFA_F_NODAD) {
2819 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2820 spin_unlock(&ifp->lock);
2821 read_unlock_bh(&idev->lock);
2823 addrconf_dad_completed(ifp);
2827 if (!(idev->if_flags & IF_READY)) {
2828 spin_unlock(&ifp->lock);
2829 read_unlock_bh(&idev->lock);
2831 * If the device is not ready:
2832 * - keep it tentative if it is a permanent address.
2833 * - otherwise, kill it.
2836 addrconf_dad_stop(ifp, 0);
2841 * Optimistic nodes can start receiving
2844 if (ifp->flags & IFA_F_OPTIMISTIC)
2845 ip6_ins_rt(ifp->rt);
2847 addrconf_dad_kick(ifp);
2848 spin_unlock(&ifp->lock);
2850 read_unlock_bh(&idev->lock);
2853 static void addrconf_dad_timer(unsigned long data)
2855 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2856 struct inet6_dev *idev = ifp->idev;
2857 struct in6_addr mcaddr;
2859 read_lock(&idev->lock);
2860 if (idev->dead || !(idev->if_flags & IF_READY)) {
2861 read_unlock(&idev->lock);
2865 spin_lock(&ifp->lock);
2866 if (ifp->probes == 0) {
2868 * DAD was successful
2871 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2872 spin_unlock(&ifp->lock);
2873 read_unlock(&idev->lock);
2875 addrconf_dad_completed(ifp);
2881 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2882 spin_unlock(&ifp->lock);
2883 read_unlock(&idev->lock);
2885 /* send a neighbour solicitation for our addr */
2886 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2887 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
2892 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2894 struct net_device *dev = ifp->idev->dev;
2897 * Configure the address for reception. Now it is valid.
2900 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2902 /* If added prefix is link local and forwarding is off,
2903 start sending router solicitations.
2906 if (ifp->idev->cnf.forwarding == 0 &&
2907 ifp->idev->cnf.rtr_solicits > 0 &&
2908 (dev->flags&IFF_LOOPBACK) == 0 &&
2909 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2911 * If a host as already performed a random delay
2912 * [...] as part of DAD [...] there is no need
2913 * to delay again before sending the first RS
2915 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2917 spin_lock_bh(&ifp->lock);
2919 ifp->idev->if_flags |= IF_RS_SENT;
2920 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2921 spin_unlock_bh(&ifp->lock);
2925 static void addrconf_dad_run(struct inet6_dev *idev)
2927 struct inet6_ifaddr *ifp;
2929 read_lock_bh(&idev->lock);
2930 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2931 spin_lock(&ifp->lock);
2932 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2933 spin_unlock(&ifp->lock);
2936 spin_unlock(&ifp->lock);
2937 addrconf_dad_kick(ifp);
2939 read_unlock_bh(&idev->lock);
2942 #ifdef CONFIG_PROC_FS
2943 struct if6_iter_state {
2944 struct seq_net_private p;
2948 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2950 struct inet6_ifaddr *ifa = NULL;
2951 struct if6_iter_state *state = seq->private;
2952 struct net *net = seq_file_net(seq);
2954 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2955 struct hlist_node *n;
2956 hlist_for_each_entry_rcu(ifa, n, &inet6_addr_lst[state->bucket],
2958 if (net_eq(dev_net(ifa->idev->dev), net))
2964 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
2965 struct inet6_ifaddr *ifa)
2967 struct if6_iter_state *state = seq->private;
2968 struct net *net = seq_file_net(seq);
2969 struct hlist_node *n = &ifa->addr_lst;
2971 hlist_for_each_entry_continue_rcu(ifa, n, addr_lst)
2972 if (net_eq(dev_net(ifa->idev->dev), net))
2975 while (++state->bucket < IN6_ADDR_HSIZE) {
2976 hlist_for_each_entry(ifa, n,
2977 &inet6_addr_lst[state->bucket], addr_lst) {
2978 if (net_eq(dev_net(ifa->idev->dev), net))
2986 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2988 struct inet6_ifaddr *ifa = if6_get_first(seq);
2991 while (pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2993 return pos ? NULL : ifa;
2996 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3000 return if6_get_idx(seq, *pos);
3003 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3005 struct inet6_ifaddr *ifa;
3007 ifa = if6_get_next(seq, v);
3012 static void if6_seq_stop(struct seq_file *seq, void *v)
3015 rcu_read_unlock_bh();
3018 static int if6_seq_show(struct seq_file *seq, void *v)
3020 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3021 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3023 ifp->idev->dev->ifindex,
3027 ifp->idev->dev->name);
3031 static const struct seq_operations if6_seq_ops = {
3032 .start = if6_seq_start,
3033 .next = if6_seq_next,
3034 .show = if6_seq_show,
3035 .stop = if6_seq_stop,
3038 static int if6_seq_open(struct inode *inode, struct file *file)
3040 return seq_open_net(inode, file, &if6_seq_ops,
3041 sizeof(struct if6_iter_state));
3044 static const struct file_operations if6_fops = {
3045 .owner = THIS_MODULE,
3046 .open = if6_seq_open,
3048 .llseek = seq_lseek,
3049 .release = seq_release_net,
3052 static int __net_init if6_proc_net_init(struct net *net)
3054 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
3059 static void __net_exit if6_proc_net_exit(struct net *net)
3061 proc_net_remove(net, "if_inet6");
3064 static struct pernet_operations if6_proc_net_ops = {
3065 .init = if6_proc_net_init,
3066 .exit = if6_proc_net_exit,
3069 int __init if6_proc_init(void)
3071 return register_pernet_subsys(&if6_proc_net_ops);
3074 void if6_proc_exit(void)
3076 unregister_pernet_subsys(&if6_proc_net_ops);
3078 #endif /* CONFIG_PROC_FS */
3080 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3081 /* Check if address is a home address configured on any interface. */
3082 int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
3085 struct inet6_ifaddr *ifp = NULL;
3086 struct hlist_node *n;
3087 unsigned int hash = ipv6_addr_hash(addr);
3090 hlist_for_each_entry_rcu(ifp, n, &inet6_addr_lst[hash], addr_lst) {
3091 if (!net_eq(dev_net(ifp->idev->dev), net))
3093 if (ipv6_addr_equal(&ifp->addr, addr) &&
3094 (ifp->flags & IFA_F_HOMEADDRESS)) {
3099 rcu_read_unlock_bh();
3105 * Periodic address status verification
3108 static void addrconf_verify(unsigned long foo)
3110 struct inet6_ifaddr *ifp;
3111 struct hlist_node *node;
3112 unsigned long now, next;
3116 spin_lock(&addrconf_verify_lock);
3118 next = now + ADDR_CHECK_FREQUENCY;
3120 del_timer(&addr_chk_timer);
3122 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3124 hlist_for_each_entry_rcu(ifp, node,
3125 &inet6_addr_lst[i], addr_lst) {
3127 #ifdef CONFIG_IPV6_PRIVACY
3128 unsigned long regen_advance;
3131 if (ifp->flags & IFA_F_PERMANENT)
3134 spin_lock(&ifp->lock);
3135 age = (now - ifp->tstamp) / HZ;
3137 #ifdef CONFIG_IPV6_PRIVACY
3138 regen_advance = ifp->idev->cnf.regen_max_retry *
3139 ifp->idev->cnf.dad_transmits *
3140 ifp->idev->nd_parms->retrans_time / HZ;
3143 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3144 age >= ifp->valid_lft) {
3145 spin_unlock(&ifp->lock);
3149 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3150 spin_unlock(&ifp->lock);
3152 } else if (age >= ifp->prefered_lft) {
3153 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3156 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3158 ifp->flags |= IFA_F_DEPRECATED;
3161 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3162 next = ifp->tstamp + ifp->valid_lft * HZ;
3164 spin_unlock(&ifp->lock);
3169 ipv6_ifa_notify(0, ifp);
3173 #ifdef CONFIG_IPV6_PRIVACY
3174 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3175 !(ifp->flags&IFA_F_TENTATIVE)) {
3176 if (age >= ifp->prefered_lft - regen_advance) {
3177 struct inet6_ifaddr *ifpub = ifp->ifpub;
3178 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3179 next = ifp->tstamp + ifp->prefered_lft * HZ;
3180 if (!ifp->regen_count && ifpub) {
3183 in6_ifa_hold(ifpub);
3184 spin_unlock(&ifp->lock);
3186 spin_lock(&ifpub->lock);
3187 ifpub->regen_count = 0;
3188 spin_unlock(&ifpub->lock);
3189 ipv6_create_tempaddr(ifpub, ifp);
3194 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3195 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3196 spin_unlock(&ifp->lock);
3199 /* ifp->prefered_lft <= ifp->valid_lft */
3200 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3201 next = ifp->tstamp + ifp->prefered_lft * HZ;
3202 spin_unlock(&ifp->lock);
3207 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
3208 add_timer(&addr_chk_timer);
3209 spin_unlock(&addrconf_verify_lock);
3210 rcu_read_unlock_bh();
3213 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3215 struct in6_addr *pfx = NULL;
3218 pfx = nla_data(addr);
3221 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3224 pfx = nla_data(local);
3230 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3231 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3232 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3233 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3237 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3239 struct net *net = sock_net(skb->sk);
3240 struct ifaddrmsg *ifm;
3241 struct nlattr *tb[IFA_MAX+1];
3242 struct in6_addr *pfx;
3245 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3249 ifm = nlmsg_data(nlh);
3250 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3254 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3257 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3258 u32 prefered_lft, u32 valid_lft)
3262 unsigned long timeout;
3264 if (!valid_lft || (prefered_lft > valid_lft))
3267 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3268 if (addrconf_finite_timeout(timeout)) {
3269 expires = jiffies_to_clock_t(timeout * HZ);
3270 valid_lft = timeout;
3271 flags = RTF_EXPIRES;
3275 ifa_flags |= IFA_F_PERMANENT;
3278 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3279 if (addrconf_finite_timeout(timeout)) {
3281 ifa_flags |= IFA_F_DEPRECATED;
3282 prefered_lft = timeout;
3285 spin_lock_bh(&ifp->lock);
3286 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3287 ifp->tstamp = jiffies;
3288 ifp->valid_lft = valid_lft;
3289 ifp->prefered_lft = prefered_lft;
3291 spin_unlock_bh(&ifp->lock);
3292 if (!(ifp->flags&IFA_F_TENTATIVE))
3293 ipv6_ifa_notify(0, ifp);
3295 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3303 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3305 struct net *net = sock_net(skb->sk);
3306 struct ifaddrmsg *ifm;
3307 struct nlattr *tb[IFA_MAX+1];
3308 struct in6_addr *pfx;
3309 struct inet6_ifaddr *ifa;
3310 struct net_device *dev;
3311 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3315 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3319 ifm = nlmsg_data(nlh);
3320 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3324 if (tb[IFA_CACHEINFO]) {
3325 struct ifa_cacheinfo *ci;
3327 ci = nla_data(tb[IFA_CACHEINFO]);
3328 valid_lft = ci->ifa_valid;
3329 preferred_lft = ci->ifa_prefered;
3331 preferred_lft = INFINITY_LIFE_TIME;
3332 valid_lft = INFINITY_LIFE_TIME;
3335 dev = __dev_get_by_index(net, ifm->ifa_index);
3339 /* We ignore other flags so far. */
3340 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3342 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3345 * It would be best to check for !NLM_F_CREATE here but
3346 * userspace alreay relies on not having to provide this.
3348 return inet6_addr_add(net, ifm->ifa_index, pfx,
3349 ifm->ifa_prefixlen, ifa_flags,
3350 preferred_lft, valid_lft);
3353 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3354 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3357 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3364 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3365 u8 scope, int ifindex)
3367 struct ifaddrmsg *ifm;
3369 ifm = nlmsg_data(nlh);
3370 ifm->ifa_family = AF_INET6;
3371 ifm->ifa_prefixlen = prefixlen;
3372 ifm->ifa_flags = flags;
3373 ifm->ifa_scope = scope;
3374 ifm->ifa_index = ifindex;
3377 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3378 unsigned long tstamp, u32 preferred, u32 valid)
3380 struct ifa_cacheinfo ci;
3382 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3383 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3384 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3385 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3386 ci.ifa_prefered = preferred;
3387 ci.ifa_valid = valid;
3389 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3392 static inline int rt_scope(int ifa_scope)
3394 if (ifa_scope & IFA_HOST)
3395 return RT_SCOPE_HOST;
3396 else if (ifa_scope & IFA_LINK)
3397 return RT_SCOPE_LINK;
3398 else if (ifa_scope & IFA_SITE)
3399 return RT_SCOPE_SITE;
3401 return RT_SCOPE_UNIVERSE;
3404 static inline int inet6_ifaddr_msgsize(void)
3406 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3407 + nla_total_size(16) /* IFA_ADDRESS */
3408 + nla_total_size(sizeof(struct ifa_cacheinfo));
3411 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3412 u32 pid, u32 seq, int event, unsigned int flags)
3414 struct nlmsghdr *nlh;
3415 u32 preferred, valid;
3417 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3421 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3422 ifa->idev->dev->ifindex);
3424 if (!(ifa->flags&IFA_F_PERMANENT)) {
3425 preferred = ifa->prefered_lft;
3426 valid = ifa->valid_lft;
3427 if (preferred != INFINITY_LIFE_TIME) {
3428 long tval = (jiffies - ifa->tstamp)/HZ;
3429 if (preferred > tval)
3433 if (valid != INFINITY_LIFE_TIME)
3437 preferred = INFINITY_LIFE_TIME;
3438 valid = INFINITY_LIFE_TIME;
3441 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3442 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3443 nlmsg_cancel(skb, nlh);
3447 return nlmsg_end(skb, nlh);
3450 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3451 u32 pid, u32 seq, int event, u16 flags)
3453 struct nlmsghdr *nlh;
3454 u8 scope = RT_SCOPE_UNIVERSE;
3455 int ifindex = ifmca->idev->dev->ifindex;
3457 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3458 scope = RT_SCOPE_SITE;
3460 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3464 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3465 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3466 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3467 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3468 nlmsg_cancel(skb, nlh);
3472 return nlmsg_end(skb, nlh);
3475 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3476 u32 pid, u32 seq, int event, unsigned int flags)
3478 struct nlmsghdr *nlh;
3479 u8 scope = RT_SCOPE_UNIVERSE;
3480 int ifindex = ifaca->aca_idev->dev->ifindex;
3482 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3483 scope = RT_SCOPE_SITE;
3485 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3489 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3490 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3491 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3492 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3493 nlmsg_cancel(skb, nlh);
3497 return nlmsg_end(skb, nlh);
3506 /* called with rcu_read_lock() */
3507 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3508 struct netlink_callback *cb, enum addr_type_t type,
3509 int s_ip_idx, int *p_ip_idx)
3511 struct ifmcaddr6 *ifmca;
3512 struct ifacaddr6 *ifaca;
3514 int ip_idx = *p_ip_idx;
3516 read_lock_bh(&idev->lock);
3518 case UNICAST_ADDR: {
3519 struct inet6_ifaddr *ifa;
3521 /* unicast address incl. temp addr */
3522 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3523 if (++ip_idx < s_ip_idx)
3525 err = inet6_fill_ifaddr(skb, ifa,
3526 NETLINK_CB(cb->skb).pid,
3535 case MULTICAST_ADDR:
3536 /* multicast address */
3537 for (ifmca = idev->mc_list; ifmca;
3538 ifmca = ifmca->next, ip_idx++) {
3539 if (ip_idx < s_ip_idx)
3541 err = inet6_fill_ifmcaddr(skb, ifmca,
3542 NETLINK_CB(cb->skb).pid,
3551 /* anycast address */
3552 for (ifaca = idev->ac_list; ifaca;
3553 ifaca = ifaca->aca_next, ip_idx++) {
3554 if (ip_idx < s_ip_idx)
3556 err = inet6_fill_ifacaddr(skb, ifaca,
3557 NETLINK_CB(cb->skb).pid,
3568 read_unlock_bh(&idev->lock);
3573 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3574 enum addr_type_t type)
3576 struct net *net = sock_net(skb->sk);
3579 int s_idx, s_ip_idx;
3580 struct net_device *dev;
3581 struct inet6_dev *idev;
3582 struct hlist_head *head;
3583 struct hlist_node *node;
3586 s_idx = idx = cb->args[1];
3587 s_ip_idx = ip_idx = cb->args[2];
3590 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3592 head = &net->dev_index_head[h];
3593 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3599 idev = __in6_dev_get(dev);
3603 if (in6_dump_addrs(idev, skb, cb, type,
3604 s_ip_idx, &ip_idx) <= 0)
3614 cb->args[2] = ip_idx;
3619 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3621 enum addr_type_t type = UNICAST_ADDR;
3623 return inet6_dump_addr(skb, cb, type);
3626 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3628 enum addr_type_t type = MULTICAST_ADDR;
3630 return inet6_dump_addr(skb, cb, type);
3634 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3636 enum addr_type_t type = ANYCAST_ADDR;
3638 return inet6_dump_addr(skb, cb, type);
3641 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3644 struct net *net = sock_net(in_skb->sk);
3645 struct ifaddrmsg *ifm;
3646 struct nlattr *tb[IFA_MAX+1];
3647 struct in6_addr *addr = NULL;
3648 struct net_device *dev = NULL;
3649 struct inet6_ifaddr *ifa;
3650 struct sk_buff *skb;
3653 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3657 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3663 ifm = nlmsg_data(nlh);
3665 dev = __dev_get_by_index(net, ifm->ifa_index);
3667 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
3669 err = -EADDRNOTAVAIL;
3673 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
3679 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3680 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3682 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3683 WARN_ON(err == -EMSGSIZE);
3687 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
3694 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3696 struct sk_buff *skb;
3697 struct net *net = dev_net(ifa->idev->dev);
3700 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3704 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3706 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3707 WARN_ON(err == -EMSGSIZE);
3711 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3715 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3718 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3719 __s32 *array, int bytes)
3721 BUG_ON(bytes < (DEVCONF_MAX * 4));
3723 memset(array, 0, bytes);
3724 array[DEVCONF_FORWARDING] = cnf->forwarding;
3725 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3726 array[DEVCONF_MTU6] = cnf->mtu6;
3727 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3728 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3729 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3730 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3731 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3732 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3733 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3734 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3735 #ifdef CONFIG_IPV6_PRIVACY
3736 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3737 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3738 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3739 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3740 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3742 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3743 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3744 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3745 #ifdef CONFIG_IPV6_ROUTER_PREF
3746 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3747 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3748 #ifdef CONFIG_IPV6_ROUTE_INFO
3749 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3752 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3753 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3754 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3755 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3757 #ifdef CONFIG_IPV6_MROUTE
3758 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3760 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
3761 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
3762 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
3765 static inline size_t inet6_if_nlmsg_size(void)
3767 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3768 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3769 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3770 + nla_total_size(4) /* IFLA_MTU */
3771 + nla_total_size(4) /* IFLA_LINK */
3772 + nla_total_size( /* IFLA_PROTINFO */
3773 nla_total_size(4) /* IFLA_INET6_FLAGS */
3774 + nla_total_size(sizeof(struct ifla_cacheinfo))
3775 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3776 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3777 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
3781 static inline void __snmp6_fill_stats(u64 *stats, void __percpu **mib,
3782 int items, int bytes)
3785 int pad = bytes - sizeof(u64) * items;
3788 /* Use put_unaligned() because stats may not be aligned for u64. */
3789 put_unaligned(items, &stats[0]);
3790 for (i = 1; i < items; i++)
3791 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3793 memset(&stats[items], 0, pad);
3796 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3800 case IFLA_INET6_STATS:
3801 __snmp6_fill_stats(stats, (void __percpu **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3803 case IFLA_INET6_ICMP6STATS:
3804 __snmp6_fill_stats(stats, (void __percpu **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3809 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3810 u32 pid, u32 seq, int event, unsigned int flags)
3812 struct net_device *dev = idev->dev;
3814 struct ifinfomsg *hdr;
3815 struct nlmsghdr *nlh;
3817 struct ifla_cacheinfo ci;
3819 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3823 hdr = nlmsg_data(nlh);
3824 hdr->ifi_family = AF_INET6;
3826 hdr->ifi_type = dev->type;
3827 hdr->ifi_index = dev->ifindex;
3828 hdr->ifi_flags = dev_get_flags(dev);
3829 hdr->ifi_change = 0;
3831 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3834 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3836 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3837 if (dev->ifindex != dev->iflink)
3838 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3840 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3841 if (protoinfo == NULL)
3842 goto nla_put_failure;
3844 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3846 ci.max_reasm_len = IPV6_MAXPLEN;
3847 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3848 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3849 ci.reachable_time = idev->nd_parms->reachable_time;
3850 ci.retrans_time = idev->nd_parms->retrans_time;
3851 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3853 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3855 goto nla_put_failure;
3856 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3858 /* XXX - MC not implemented */
3860 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3862 goto nla_put_failure;
3863 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3865 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3867 goto nla_put_failure;
3868 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3870 nla_nest_end(skb, protoinfo);
3871 return nlmsg_end(skb, nlh);
3874 nlmsg_cancel(skb, nlh);
3878 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3880 struct net *net = sock_net(skb->sk);
3883 struct net_device *dev;
3884 struct inet6_dev *idev;
3885 struct hlist_head *head;
3886 struct hlist_node *node;
3889 s_idx = cb->args[1];
3892 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3894 head = &net->dev_index_head[h];
3895 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3898 idev = __in6_dev_get(dev);
3901 if (inet6_fill_ifinfo(skb, idev,
3902 NETLINK_CB(cb->skb).pid,
3904 RTM_NEWLINK, NLM_F_MULTI) <= 0)
3918 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3920 struct sk_buff *skb;
3921 struct net *net = dev_net(idev->dev);
3924 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
3928 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
3930 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3931 WARN_ON(err == -EMSGSIZE);
3935 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3939 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3942 static inline size_t inet6_prefix_nlmsg_size(void)
3944 return NLMSG_ALIGN(sizeof(struct prefixmsg))
3945 + nla_total_size(sizeof(struct in6_addr))
3946 + nla_total_size(sizeof(struct prefix_cacheinfo));
3949 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3950 struct prefix_info *pinfo, u32 pid, u32 seq,
3951 int event, unsigned int flags)
3953 struct prefixmsg *pmsg;
3954 struct nlmsghdr *nlh;
3955 struct prefix_cacheinfo ci;
3957 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3961 pmsg = nlmsg_data(nlh);
3962 pmsg->prefix_family = AF_INET6;
3963 pmsg->prefix_pad1 = 0;
3964 pmsg->prefix_pad2 = 0;
3965 pmsg->prefix_ifindex = idev->dev->ifindex;
3966 pmsg->prefix_len = pinfo->prefix_len;
3967 pmsg->prefix_type = pinfo->type;
3968 pmsg->prefix_pad3 = 0;
3969 pmsg->prefix_flags = 0;
3971 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3972 if (pinfo->autoconf)
3973 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3975 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3977 ci.preferred_time = ntohl(pinfo->prefered);
3978 ci.valid_time = ntohl(pinfo->valid);
3979 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3981 return nlmsg_end(skb, nlh);
3984 nlmsg_cancel(skb, nlh);
3988 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3989 struct prefix_info *pinfo)
3991 struct sk_buff *skb;
3992 struct net *net = dev_net(idev->dev);
3995 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
3999 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4001 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4002 WARN_ON(err == -EMSGSIZE);
4006 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4010 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4013 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4015 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4020 * If the address was optimistic
4021 * we inserted the route at the start of
4022 * our DAD process, so we don't need
4025 if (!(ifp->rt->rt6i_node))
4026 ip6_ins_rt(ifp->rt);
4027 if (ifp->idev->cnf.forwarding)
4028 addrconf_join_anycast(ifp);
4031 if (ifp->idev->cnf.forwarding)
4032 addrconf_leave_anycast(ifp);
4033 addrconf_leave_solict(ifp->idev, &ifp->addr);
4034 dst_hold(&ifp->rt->u.dst);
4035 if (ip6_del_rt(ifp->rt))
4036 dst_free(&ifp->rt->u.dst);
4041 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4044 if (likely(ifp->idev->dead == 0))
4045 __ipv6_ifa_notify(event, ifp);
4046 rcu_read_unlock_bh();
4049 #ifdef CONFIG_SYSCTL
4052 int addrconf_sysctl_forward(ctl_table *ctl, int write,
4053 void __user *buffer, size_t *lenp, loff_t *ppos)
4055 int *valp = ctl->data;
4060 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4063 ret = addrconf_fixup_forwarding(ctl, valp, val);
4069 static void dev_disable_change(struct inet6_dev *idev)
4071 if (!idev || !idev->dev)
4074 if (idev->cnf.disable_ipv6)
4075 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4077 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4080 static void addrconf_disable_change(struct net *net, __s32 newf)
4082 struct net_device *dev;
4083 struct inet6_dev *idev;
4086 for_each_netdev_rcu(net, dev) {
4087 idev = __in6_dev_get(dev);
4089 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4090 idev->cnf.disable_ipv6 = newf;
4092 dev_disable_change(idev);
4098 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int old)
4102 net = (struct net *)table->extra2;
4104 if (p == &net->ipv6.devconf_dflt->disable_ipv6)
4107 if (!rtnl_trylock()) {
4108 /* Restore the original values before restarting */
4110 return restart_syscall();
4113 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4114 __s32 newf = net->ipv6.devconf_all->disable_ipv6;
4115 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4116 addrconf_disable_change(net, newf);
4117 } else if ((!*p) ^ (!old))
4118 dev_disable_change((struct inet6_dev *)table->extra1);
4125 int addrconf_sysctl_disable(ctl_table *ctl, int write,
4126 void __user *buffer, size_t *lenp, loff_t *ppos)
4128 int *valp = ctl->data;
4133 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4136 ret = addrconf_disable_ipv6(ctl, valp, val);
4142 static struct addrconf_sysctl_table
4144 struct ctl_table_header *sysctl_header;
4145 ctl_table addrconf_vars[DEVCONF_MAX+1];
4147 } addrconf_sysctl __read_mostly = {
4148 .sysctl_header = NULL,
4151 .procname = "forwarding",
4152 .data = &ipv6_devconf.forwarding,
4153 .maxlen = sizeof(int),
4155 .proc_handler = addrconf_sysctl_forward,
4158 .procname = "hop_limit",
4159 .data = &ipv6_devconf.hop_limit,
4160 .maxlen = sizeof(int),
4162 .proc_handler = proc_dointvec,
4166 .data = &ipv6_devconf.mtu6,
4167 .maxlen = sizeof(int),
4169 .proc_handler = proc_dointvec,
4172 .procname = "accept_ra",
4173 .data = &ipv6_devconf.accept_ra,
4174 .maxlen = sizeof(int),
4176 .proc_handler = proc_dointvec,
4179 .procname = "accept_redirects",
4180 .data = &ipv6_devconf.accept_redirects,
4181 .maxlen = sizeof(int),
4183 .proc_handler = proc_dointvec,
4186 .procname = "autoconf",
4187 .data = &ipv6_devconf.autoconf,
4188 .maxlen = sizeof(int),
4190 .proc_handler = proc_dointvec,
4193 .procname = "dad_transmits",
4194 .data = &ipv6_devconf.dad_transmits,
4195 .maxlen = sizeof(int),
4197 .proc_handler = proc_dointvec,
4200 .procname = "router_solicitations",
4201 .data = &ipv6_devconf.rtr_solicits,
4202 .maxlen = sizeof(int),
4204 .proc_handler = proc_dointvec,
4207 .procname = "router_solicitation_interval",
4208 .data = &ipv6_devconf.rtr_solicit_interval,
4209 .maxlen = sizeof(int),
4211 .proc_handler = proc_dointvec_jiffies,
4214 .procname = "router_solicitation_delay",
4215 .data = &ipv6_devconf.rtr_solicit_delay,
4216 .maxlen = sizeof(int),
4218 .proc_handler = proc_dointvec_jiffies,
4221 .procname = "force_mld_version",
4222 .data = &ipv6_devconf.force_mld_version,
4223 .maxlen = sizeof(int),
4225 .proc_handler = proc_dointvec,
4227 #ifdef CONFIG_IPV6_PRIVACY
4229 .procname = "use_tempaddr",
4230 .data = &ipv6_devconf.use_tempaddr,
4231 .maxlen = sizeof(int),
4233 .proc_handler = proc_dointvec,
4236 .procname = "temp_valid_lft",
4237 .data = &ipv6_devconf.temp_valid_lft,
4238 .maxlen = sizeof(int),
4240 .proc_handler = proc_dointvec,
4243 .procname = "temp_prefered_lft",
4244 .data = &ipv6_devconf.temp_prefered_lft,
4245 .maxlen = sizeof(int),
4247 .proc_handler = proc_dointvec,
4250 .procname = "regen_max_retry",
4251 .data = &ipv6_devconf.regen_max_retry,
4252 .maxlen = sizeof(int),
4254 .proc_handler = proc_dointvec,
4257 .procname = "max_desync_factor",
4258 .data = &ipv6_devconf.max_desync_factor,
4259 .maxlen = sizeof(int),
4261 .proc_handler = proc_dointvec,
4265 .procname = "max_addresses",
4266 .data = &ipv6_devconf.max_addresses,
4267 .maxlen = sizeof(int),
4269 .proc_handler = proc_dointvec,
4272 .procname = "accept_ra_defrtr",
4273 .data = &ipv6_devconf.accept_ra_defrtr,
4274 .maxlen = sizeof(int),
4276 .proc_handler = proc_dointvec,
4279 .procname = "accept_ra_pinfo",
4280 .data = &ipv6_devconf.accept_ra_pinfo,
4281 .maxlen = sizeof(int),
4283 .proc_handler = proc_dointvec,
4285 #ifdef CONFIG_IPV6_ROUTER_PREF
4287 .procname = "accept_ra_rtr_pref",
4288 .data = &ipv6_devconf.accept_ra_rtr_pref,
4289 .maxlen = sizeof(int),
4291 .proc_handler = proc_dointvec,
4294 .procname = "router_probe_interval",
4295 .data = &ipv6_devconf.rtr_probe_interval,
4296 .maxlen = sizeof(int),
4298 .proc_handler = proc_dointvec_jiffies,
4300 #ifdef CONFIG_IPV6_ROUTE_INFO
4302 .procname = "accept_ra_rt_info_max_plen",
4303 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4304 .maxlen = sizeof(int),
4306 .proc_handler = proc_dointvec,
4311 .procname = "proxy_ndp",
4312 .data = &ipv6_devconf.proxy_ndp,
4313 .maxlen = sizeof(int),
4315 .proc_handler = proc_dointvec,
4318 .procname = "accept_source_route",
4319 .data = &ipv6_devconf.accept_source_route,
4320 .maxlen = sizeof(int),
4322 .proc_handler = proc_dointvec,
4324 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4326 .procname = "optimistic_dad",
4327 .data = &ipv6_devconf.optimistic_dad,
4328 .maxlen = sizeof(int),
4330 .proc_handler = proc_dointvec,
4334 #ifdef CONFIG_IPV6_MROUTE
4336 .procname = "mc_forwarding",
4337 .data = &ipv6_devconf.mc_forwarding,
4338 .maxlen = sizeof(int),
4340 .proc_handler = proc_dointvec,
4344 .procname = "disable_ipv6",
4345 .data = &ipv6_devconf.disable_ipv6,
4346 .maxlen = sizeof(int),
4348 .proc_handler = addrconf_sysctl_disable,
4351 .procname = "accept_dad",
4352 .data = &ipv6_devconf.accept_dad,
4353 .maxlen = sizeof(int),
4355 .proc_handler = proc_dointvec,
4358 .procname = "force_tllao",
4359 .data = &ipv6_devconf.force_tllao,
4360 .maxlen = sizeof(int),
4362 .proc_handler = proc_dointvec
4370 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4371 struct inet6_dev *idev, struct ipv6_devconf *p)
4374 struct addrconf_sysctl_table *t;
4376 #define ADDRCONF_CTL_PATH_DEV 3
4378 struct ctl_path addrconf_ctl_path[] = {
4379 { .procname = "net", },
4380 { .procname = "ipv6", },
4381 { .procname = "conf", },
4382 { /* to be set */ },
4387 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4391 for (i = 0; t->addrconf_vars[i].data; i++) {
4392 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
4393 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4394 t->addrconf_vars[i].extra2 = net;
4398 * Make a copy of dev_name, because '.procname' is regarded as const
4399 * by sysctl and we wouldn't want anyone to change it under our feet
4400 * (see SIOCSIFNAME).
4402 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4406 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4408 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4410 if (t->sysctl_header == NULL)
4424 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4426 struct addrconf_sysctl_table *t;
4428 if (p->sysctl == NULL)
4433 unregister_sysctl_table(t->sysctl_header);
4438 static void addrconf_sysctl_register(struct inet6_dev *idev)
4440 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
4441 &ndisc_ifinfo_sysctl_change);
4442 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4446 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4448 __addrconf_sysctl_unregister(&idev->cnf);
4449 neigh_sysctl_unregister(idev->nd_parms);
4455 static int __net_init addrconf_init_net(struct net *net)
4458 struct ipv6_devconf *all, *dflt;
4461 all = &ipv6_devconf;
4462 dflt = &ipv6_devconf_dflt;
4464 if (!net_eq(net, &init_net)) {
4465 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4469 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4471 goto err_alloc_dflt;
4473 /* these will be inherited by all namespaces */
4474 dflt->autoconf = ipv6_defaults.autoconf;
4475 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
4478 net->ipv6.devconf_all = all;
4479 net->ipv6.devconf_dflt = dflt;
4481 #ifdef CONFIG_SYSCTL
4482 err = __addrconf_sysctl_register(net, "all", NULL, all);
4486 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
4492 #ifdef CONFIG_SYSCTL
4494 __addrconf_sysctl_unregister(all);
4504 static void __net_exit addrconf_exit_net(struct net *net)
4506 #ifdef CONFIG_SYSCTL
4507 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4508 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4510 if (!net_eq(net, &init_net)) {
4511 kfree(net->ipv6.devconf_dflt);
4512 kfree(net->ipv6.devconf_all);
4516 static struct pernet_operations addrconf_ops = {
4517 .init = addrconf_init_net,
4518 .exit = addrconf_exit_net,
4525 int register_inet6addr_notifier(struct notifier_block *nb)
4527 return atomic_notifier_chain_register(&inet6addr_chain, nb);
4529 EXPORT_SYMBOL(register_inet6addr_notifier);
4531 int unregister_inet6addr_notifier(struct notifier_block *nb)
4533 return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
4535 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4538 * Init / cleanup code
4541 int __init addrconf_init(void)
4545 err = ipv6_addr_label_init();
4547 printk(KERN_CRIT "IPv6 Addrconf:"
4548 " cannot initialize default policy table: %d.\n", err);
4552 register_pernet_subsys(&addrconf_ops);
4554 /* The addrconf netdev notifier requires that loopback_dev
4555 * has it's ipv6 private information allocated and setup
4556 * before it can bring up and give link-local addresses
4557 * to other devices which are up.
4559 * Unfortunately, loopback_dev is not necessarily the first
4560 * entry in the global dev_base list of net devices. In fact,
4561 * it is likely to be the very last entry on that list.
4562 * So this causes the notifier registry below to try and
4563 * give link-local addresses to all devices besides loopback_dev
4564 * first, then loopback_dev, which cases all the non-loopback_dev
4565 * devices to fail to get a link-local address.
4567 * So, as a temporary fix, allocate the ipv6 structure for
4568 * loopback_dev first by hand.
4569 * Longer term, all of the dependencies ipv6 has upon the loopback
4570 * device and it being up should be removed.
4573 if (!ipv6_add_dev(init_net.loopback_dev))
4579 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4580 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
4582 register_netdevice_notifier(&ipv6_dev_notf);
4586 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4590 /* Only the first call to __rtnl_register can fail */
4591 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4592 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4593 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4594 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4595 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4597 ipv6_addr_label_rtnl_register();
4601 unregister_netdevice_notifier(&ipv6_dev_notf);
4603 unregister_pernet_subsys(&addrconf_ops);
4608 void addrconf_cleanup(void)
4610 struct net_device *dev;
4613 unregister_netdevice_notifier(&ipv6_dev_notf);
4614 unregister_pernet_subsys(&addrconf_ops);
4618 /* clean dev list */
4619 for_each_netdev(&init_net, dev) {
4620 if (__in6_dev_get(dev) == NULL)
4622 addrconf_ifdown(dev, 1);
4624 addrconf_ifdown(init_net.loopback_dev, 2);
4629 spin_lock_bh(&addrconf_hash_lock);
4630 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4631 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
4632 spin_unlock_bh(&addrconf_hash_lock);
4634 del_timer(&addr_chk_timer);