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>
56 #include <linux/slab.h>
58 #include <linux/sysctl.h>
60 #include <linux/capability.h>
61 #include <linux/delay.h>
62 #include <linux/notifier.h>
63 #include <linux/string.h>
65 #include <net/net_namespace.h>
70 #include <net/protocol.h>
71 #include <net/ndisc.h>
72 #include <net/ip6_route.h>
73 #include <net/addrconf.h>
76 #include <net/netlink.h>
77 #include <net/pkt_sched.h>
78 #include <linux/if_tunnel.h>
79 #include <linux/rtnetlink.h>
81 #ifdef CONFIG_IPV6_PRIVACY
82 #include <linux/random.h>
85 #include <linux/uaccess.h>
86 #include <asm/unaligned.h>
88 #include <linux/proc_fs.h>
89 #include <linux/seq_file.h>
91 /* Set to 3 to get tracing... */
95 #define ADBG(x) printk x
100 #define INFINITY_LIFE_TIME 0xFFFFFFFF
102 static inline u32 cstamp_delta(unsigned long cstamp)
104 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
107 #define ADDRCONF_TIMER_FUZZ_MINUS (HZ > 50 ? HZ/50 : 1)
108 #define ADDRCONF_TIMER_FUZZ (HZ / 4)
109 #define ADDRCONF_TIMER_FUZZ_MAX (HZ)
112 static void addrconf_sysctl_register(struct inet6_dev *idev);
113 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
115 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
119 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
124 #ifdef CONFIG_IPV6_PRIVACY
125 static int __ipv6_regen_rndid(struct inet6_dev *idev);
126 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
127 static void ipv6_regen_rndid(unsigned long data);
130 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
131 static int ipv6_count_addresses(struct inet6_dev *idev);
134 * Configured unicast address hash table
136 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
137 static DEFINE_SPINLOCK(addrconf_hash_lock);
139 static void addrconf_verify(unsigned long);
141 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
142 static DEFINE_SPINLOCK(addrconf_verify_lock);
144 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
145 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
147 static void addrconf_type_change(struct net_device *dev,
148 unsigned long event);
149 static int addrconf_ifdown(struct net_device *dev, int how);
151 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
152 static void addrconf_dad_timer(unsigned long data);
153 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
154 static void addrconf_dad_run(struct inet6_dev *idev);
155 static void addrconf_rs_timer(unsigned long data);
156 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
157 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
159 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
160 struct prefix_info *pinfo);
161 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
162 struct net_device *dev);
164 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
166 static struct ipv6_devconf ipv6_devconf __read_mostly = {
168 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
169 .mtu6 = IPV6_MIN_MTU,
171 .accept_redirects = 1,
173 .force_mld_version = 0,
175 .rtr_solicits = MAX_RTR_SOLICITATIONS,
176 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
177 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
178 #ifdef CONFIG_IPV6_PRIVACY
180 .temp_valid_lft = TEMP_VALID_LIFETIME,
181 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
182 .regen_max_retry = REGEN_MAX_RETRY,
183 .max_desync_factor = MAX_DESYNC_FACTOR,
185 .max_addresses = IPV6_MAX_ADDRESSES,
186 .accept_ra_defrtr = 1,
187 .accept_ra_pinfo = 1,
188 #ifdef CONFIG_IPV6_ROUTER_PREF
189 .accept_ra_rtr_pref = 1,
190 .rtr_probe_interval = 60 * HZ,
191 #ifdef CONFIG_IPV6_ROUTE_INFO
192 .accept_ra_rt_info_max_plen = 0,
196 .accept_source_route = 0, /* we do not accept RH0 by default. */
201 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
203 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
204 .mtu6 = IPV6_MIN_MTU,
206 .accept_redirects = 1,
209 .rtr_solicits = MAX_RTR_SOLICITATIONS,
210 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
211 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
212 #ifdef CONFIG_IPV6_PRIVACY
214 .temp_valid_lft = TEMP_VALID_LIFETIME,
215 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
216 .regen_max_retry = REGEN_MAX_RETRY,
217 .max_desync_factor = MAX_DESYNC_FACTOR,
219 .max_addresses = IPV6_MAX_ADDRESSES,
220 .accept_ra_defrtr = 1,
221 .accept_ra_pinfo = 1,
222 #ifdef CONFIG_IPV6_ROUTER_PREF
223 .accept_ra_rtr_pref = 1,
224 .rtr_probe_interval = 60 * HZ,
225 #ifdef CONFIG_IPV6_ROUTE_INFO
226 .accept_ra_rt_info_max_plen = 0,
230 .accept_source_route = 0, /* we do not accept RH0 by default. */
235 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
236 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
237 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
238 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
239 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
241 /* Check if a valid qdisc is available */
242 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
244 return !qdisc_tx_is_noop(dev);
247 /* Check if a route is valid prefix route */
248 static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
250 return (rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0;
253 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
255 if (del_timer(&ifp->timer))
259 enum addrconf_timer_t {
265 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
266 enum addrconf_timer_t what,
269 if (!del_timer(&ifp->timer))
274 ifp->timer.function = addrconf_dad_timer;
277 ifp->timer.function = addrconf_rs_timer;
282 ifp->timer.expires = jiffies + when;
283 add_timer(&ifp->timer);
286 static int snmp6_alloc_dev(struct inet6_dev *idev)
288 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
289 sizeof(struct ipstats_mib),
290 __alignof__(struct ipstats_mib)) < 0)
292 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
294 if (!idev->stats.icmpv6dev)
296 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
298 if (!idev->stats.icmpv6msgdev)
304 kfree(idev->stats.icmpv6dev);
306 snmp_mib_free((void __percpu **)idev->stats.ipv6);
311 static void snmp6_free_dev(struct inet6_dev *idev)
313 kfree(idev->stats.icmpv6msgdev);
314 kfree(idev->stats.icmpv6dev);
315 snmp_mib_free((void __percpu **)idev->stats.ipv6);
318 /* Nobody refers to this device, we may destroy it. */
320 void in6_dev_finish_destroy(struct inet6_dev *idev)
322 struct net_device *dev = idev->dev;
324 WARN_ON(!list_empty(&idev->addr_list));
325 WARN_ON(idev->mc_list != NULL);
327 #ifdef NET_REFCNT_DEBUG
328 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
332 pr_warning("Freeing alive inet6 device %p\n", idev);
335 snmp6_free_dev(idev);
336 kfree_rcu(idev, rcu);
339 EXPORT_SYMBOL(in6_dev_finish_destroy);
341 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
343 struct inet6_dev *ndev;
347 if (dev->mtu < IPV6_MIN_MTU)
350 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
355 rwlock_init(&ndev->lock);
357 INIT_LIST_HEAD(&ndev->addr_list);
359 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
360 ndev->cnf.mtu6 = dev->mtu;
361 ndev->cnf.sysctl = NULL;
362 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
363 if (ndev->nd_parms == NULL) {
367 if (ndev->cnf.forwarding)
368 dev_disable_lro(dev);
369 /* We refer to the device */
372 if (snmp6_alloc_dev(ndev) < 0) {
374 "%s(): cannot allocate memory for statistics; dev=%s.\n",
375 __func__, dev->name));
376 neigh_parms_release(&nd_tbl, ndev->nd_parms);
382 if (snmp6_register_dev(ndev) < 0) {
384 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
385 __func__, dev->name));
386 neigh_parms_release(&nd_tbl, ndev->nd_parms);
388 in6_dev_finish_destroy(ndev);
392 /* One reference from device. We must do this before
393 * we invoke __ipv6_regen_rndid().
397 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
398 ndev->cnf.accept_dad = -1;
400 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
401 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
403 "%s: Disabled Multicast RS\n",
405 ndev->cnf.rtr_solicits = 0;
409 #ifdef CONFIG_IPV6_PRIVACY
410 INIT_LIST_HEAD(&ndev->tempaddr_list);
411 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
412 if ((dev->flags&IFF_LOOPBACK) ||
413 dev->type == ARPHRD_TUNNEL ||
414 dev->type == ARPHRD_TUNNEL6 ||
415 dev->type == ARPHRD_SIT ||
416 dev->type == ARPHRD_NONE) {
417 ndev->cnf.use_tempaddr = -1;
420 ipv6_regen_rndid((unsigned long) ndev);
424 if (netif_running(dev) && addrconf_qdisc_ok(dev))
425 ndev->if_flags |= IF_READY;
427 ipv6_mc_init_dev(ndev);
428 ndev->tstamp = jiffies;
429 addrconf_sysctl_register(ndev);
430 /* protected by rtnl_lock */
431 RCU_INIT_POINTER(dev->ip6_ptr, ndev);
433 /* Join all-node multicast group */
434 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
439 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
441 struct inet6_dev *idev;
445 idev = __in6_dev_get(dev);
447 idev = ipv6_add_dev(dev);
452 if (dev->flags&IFF_UP)
458 static void dev_forward_change(struct inet6_dev *idev)
460 struct net_device *dev;
461 struct inet6_ifaddr *ifa;
466 if (idev->cnf.forwarding)
467 dev_disable_lro(dev);
468 if (dev && (dev->flags & IFF_MULTICAST)) {
469 if (idev->cnf.forwarding)
470 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
472 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
475 list_for_each_entry(ifa, &idev->addr_list, if_list) {
476 if (ifa->flags&IFA_F_TENTATIVE)
478 if (idev->cnf.forwarding)
479 addrconf_join_anycast(ifa);
481 addrconf_leave_anycast(ifa);
486 static void addrconf_forward_change(struct net *net, __s32 newf)
488 struct net_device *dev;
489 struct inet6_dev *idev;
492 for_each_netdev_rcu(net, dev) {
493 idev = __in6_dev_get(dev);
495 int changed = (!idev->cnf.forwarding) ^ (!newf);
496 idev->cnf.forwarding = newf;
498 dev_forward_change(idev);
504 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
508 net = (struct net *)table->extra2;
509 if (p == &net->ipv6.devconf_dflt->forwarding)
512 if (!rtnl_trylock()) {
513 /* Restore the original values before restarting */
515 return restart_syscall();
518 if (p == &net->ipv6.devconf_all->forwarding) {
519 __s32 newf = net->ipv6.devconf_all->forwarding;
520 net->ipv6.devconf_dflt->forwarding = newf;
521 addrconf_forward_change(net, newf);
522 } else if ((!*p) ^ (!old))
523 dev_forward_change((struct inet6_dev *)table->extra1);
527 rt6_purge_dflt_routers(net);
532 /* Nobody refers to this ifaddr, destroy it */
533 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
535 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
537 #ifdef NET_REFCNT_DEBUG
538 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
541 in6_dev_put(ifp->idev);
543 if (del_timer(&ifp->timer))
544 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
546 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
547 pr_warning("Freeing alive inet6 address %p\n", ifp);
550 dst_release(&ifp->rt->dst);
556 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
559 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
562 * Each device address list is sorted in order of scope -
563 * global before linklocal.
565 list_for_each(p, &idev->addr_list) {
566 struct inet6_ifaddr *ifa
567 = list_entry(p, struct inet6_ifaddr, if_list);
568 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
572 list_add_tail(&ifp->if_list, p);
575 static u32 ipv6_addr_hash(const struct in6_addr *addr)
578 * We perform the hash function over the last 64 bits of the address
579 * This will include the IEEE address token on links that support it.
581 return jhash_2words((__force u32)addr->s6_addr32[2],
582 (__force u32)addr->s6_addr32[3], 0)
583 & (IN6_ADDR_HSIZE - 1);
586 /* On success it returns ifp with increased reference count */
588 static struct inet6_ifaddr *
589 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
590 int scope, u32 flags)
592 struct inet6_ifaddr *ifa = NULL;
596 int addr_type = ipv6_addr_type(addr);
598 if (addr_type == IPV6_ADDR_ANY ||
599 addr_type & IPV6_ADDR_MULTICAST ||
600 (!(idev->dev->flags & IFF_LOOPBACK) &&
601 addr_type & IPV6_ADDR_LOOPBACK))
602 return ERR_PTR(-EADDRNOTAVAIL);
606 err = -ENODEV; /*XXX*/
610 if (idev->cnf.disable_ipv6) {
615 spin_lock(&addrconf_hash_lock);
617 /* Ignore adding duplicate addresses on an interface */
618 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
619 ADBG(("ipv6_add_addr: already assigned\n"));
624 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
627 ADBG(("ipv6_add_addr: malloc failed\n"));
632 rt = addrconf_dst_alloc(idev, addr, 0);
638 ipv6_addr_copy(&ifa->addr, addr);
640 spin_lock_init(&ifa->lock);
641 spin_lock_init(&ifa->state_lock);
642 init_timer(&ifa->timer);
643 INIT_HLIST_NODE(&ifa->addr_lst);
644 ifa->timer.data = (unsigned long) ifa;
646 ifa->prefix_len = pfxlen;
647 ifa->flags = flags | IFA_F_TENTATIVE;
648 ifa->cstamp = ifa->tstamp = jiffies;
653 * part one of RFC 4429, section 3.3
654 * We should not configure an address as
655 * optimistic if we do not yet know the link
656 * layer address of our nexhop router
659 if (dst_get_neighbour_raw(&rt->dst) == NULL)
660 ifa->flags &= ~IFA_F_OPTIMISTIC;
667 /* Add to big hash table */
668 hash = ipv6_addr_hash(addr);
670 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
671 spin_unlock(&addrconf_hash_lock);
673 write_lock(&idev->lock);
674 /* Add to inet6_dev unicast addr list. */
675 ipv6_link_dev_addr(idev, ifa);
677 #ifdef CONFIG_IPV6_PRIVACY
678 if (ifa->flags&IFA_F_TEMPORARY) {
679 list_add(&ifa->tmp_list, &idev->tempaddr_list);
685 write_unlock(&idev->lock);
687 rcu_read_unlock_bh();
689 if (likely(err == 0))
690 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
698 spin_unlock(&addrconf_hash_lock);
702 /* This function wants to get referenced ifp and releases it before return */
704 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
706 struct inet6_ifaddr *ifa, *ifn;
707 struct inet6_dev *idev = ifp->idev;
709 int deleted = 0, onlink = 0;
710 unsigned long expires = jiffies;
712 spin_lock_bh(&ifp->state_lock);
714 ifp->state = INET6_IFADDR_STATE_DEAD;
715 spin_unlock_bh(&ifp->state_lock);
717 if (state == INET6_IFADDR_STATE_DEAD)
720 spin_lock_bh(&addrconf_hash_lock);
721 hlist_del_init_rcu(&ifp->addr_lst);
722 spin_unlock_bh(&addrconf_hash_lock);
724 write_lock_bh(&idev->lock);
725 #ifdef CONFIG_IPV6_PRIVACY
726 if (ifp->flags&IFA_F_TEMPORARY) {
727 list_del(&ifp->tmp_list);
729 in6_ifa_put(ifp->ifpub);
736 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
738 list_del_init(&ifp->if_list);
741 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
745 } else if (ifp->flags & IFA_F_PERMANENT) {
746 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
748 if (ifa->flags & IFA_F_PERMANENT) {
753 unsigned long lifetime;
758 spin_lock(&ifa->lock);
760 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
762 * Note: Because this address is
763 * not permanent, lifetime <
764 * LONG_MAX / HZ here.
766 if (time_before(expires,
767 ifa->tstamp + lifetime * HZ))
768 expires = ifa->tstamp + lifetime * HZ;
769 spin_unlock(&ifa->lock);
774 write_unlock_bh(&idev->lock);
776 addrconf_del_timer(ifp);
778 ipv6_ifa_notify(RTM_DELADDR, ifp);
780 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
783 * Purge or update corresponding prefix
785 * 1) we don't purge prefix here if address was not permanent.
786 * prefix is managed by its own lifetime.
787 * 2) if there're no addresses, delete prefix.
788 * 3) if there're still other permanent address(es),
789 * corresponding prefix is still permanent.
790 * 4) otherwise, update prefix lifetime to the
791 * longest valid lifetime among the corresponding
792 * addresses on the device.
793 * Note: subsequent RA will update lifetime.
797 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
798 struct in6_addr prefix;
800 struct net *net = dev_net(ifp->idev->dev);
801 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
802 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
804 if (rt && addrconf_is_prefix_route(rt)) {
808 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
809 rt->rt6i_expires = expires;
810 rt->rt6i_flags |= RTF_EXPIRES;
813 dst_release(&rt->dst);
816 /* clean up prefsrc entries */
817 rt6_remove_prefsrc(ifp);
822 #ifdef CONFIG_IPV6_PRIVACY
823 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
825 struct inet6_dev *idev = ifp->idev;
826 struct in6_addr addr, *tmpaddr;
827 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
828 unsigned long regen_advance;
833 unsigned long now = jiffies;
835 write_lock(&idev->lock);
837 spin_lock_bh(&ift->lock);
838 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
839 spin_unlock_bh(&ift->lock);
846 if (idev->cnf.use_tempaddr <= 0) {
847 write_unlock(&idev->lock);
849 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
854 spin_lock_bh(&ifp->lock);
855 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
856 idev->cnf.use_tempaddr = -1; /*XXX*/
857 spin_unlock_bh(&ifp->lock);
858 write_unlock(&idev->lock);
860 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
866 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
867 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
868 spin_unlock_bh(&ifp->lock);
869 write_unlock(&idev->lock);
871 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
877 memcpy(&addr.s6_addr[8], idev->rndid, 8);
878 age = (now - ifp->tstamp) / HZ;
879 tmp_valid_lft = min_t(__u32,
881 idev->cnf.temp_valid_lft + age);
882 tmp_prefered_lft = min_t(__u32,
884 idev->cnf.temp_prefered_lft + age -
885 idev->cnf.max_desync_factor);
886 tmp_plen = ifp->prefix_len;
887 max_addresses = idev->cnf.max_addresses;
888 tmp_tstamp = ifp->tstamp;
889 spin_unlock_bh(&ifp->lock);
891 regen_advance = idev->cnf.regen_max_retry *
892 idev->cnf.dad_transmits *
893 idev->nd_parms->retrans_time / HZ;
894 write_unlock(&idev->lock);
896 /* A temporary address is created only if this calculated Preferred
897 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
898 * an implementation must not create a temporary address with a zero
899 * Preferred Lifetime.
901 if (tmp_prefered_lft <= regen_advance) {
908 addr_flags = IFA_F_TEMPORARY;
909 /* set in addrconf_prefix_rcv() */
910 if (ifp->flags & IFA_F_OPTIMISTIC)
911 addr_flags |= IFA_F_OPTIMISTIC;
913 ift = !max_addresses ||
914 ipv6_count_addresses(idev) < max_addresses ?
915 ipv6_add_addr(idev, &addr, tmp_plen,
916 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
918 if (!ift || IS_ERR(ift)) {
922 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
924 write_lock(&idev->lock);
928 spin_lock_bh(&ift->lock);
930 ift->valid_lft = tmp_valid_lft;
931 ift->prefered_lft = tmp_prefered_lft;
933 ift->tstamp = tmp_tstamp;
934 spin_unlock_bh(&ift->lock);
936 addrconf_dad_start(ift, 0);
945 * Choose an appropriate source address (RFC3484)
948 IPV6_SADDR_RULE_INIT = 0,
949 IPV6_SADDR_RULE_LOCAL,
950 IPV6_SADDR_RULE_SCOPE,
951 IPV6_SADDR_RULE_PREFERRED,
952 #ifdef CONFIG_IPV6_MIP6
956 IPV6_SADDR_RULE_LABEL,
957 #ifdef CONFIG_IPV6_PRIVACY
958 IPV6_SADDR_RULE_PRIVACY,
960 IPV6_SADDR_RULE_ORCHID,
961 IPV6_SADDR_RULE_PREFIX,
965 struct ipv6_saddr_score {
968 struct inet6_ifaddr *ifa;
969 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
974 struct ipv6_saddr_dst {
975 const struct in6_addr *addr;
982 static inline int ipv6_saddr_preferred(int type)
984 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
989 static int ipv6_get_saddr_eval(struct net *net,
990 struct ipv6_saddr_score *score,
991 struct ipv6_saddr_dst *dst,
996 if (i <= score->rule) {
998 case IPV6_SADDR_RULE_SCOPE:
999 ret = score->scopedist;
1001 case IPV6_SADDR_RULE_PREFIX:
1002 ret = score->matchlen;
1005 ret = !!test_bit(i, score->scorebits);
1011 case IPV6_SADDR_RULE_INIT:
1012 /* Rule 0: remember if hiscore is not ready yet */
1015 case IPV6_SADDR_RULE_LOCAL:
1016 /* Rule 1: Prefer same address */
1017 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1019 case IPV6_SADDR_RULE_SCOPE:
1020 /* Rule 2: Prefer appropriate scope
1025 * ---+--+-+---> scope
1027 * | d is scope of the destination.
1029 * | \ <- smaller scope is better if
1030 * B-15 | \ if scope is enough for destinaion.
1031 * | ret = B - scope (-1 <= scope >= d <= 15).
1033 * |/ <- greater is better
1034 * -C / if scope is not enough for destination.
1035 * /| ret = scope - C (-1 <= d < scope <= 15).
1037 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1038 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1039 * Assume B = 0 and we get C > 29.
1041 ret = __ipv6_addr_src_scope(score->addr_type);
1042 if (ret >= dst->scope)
1045 ret -= 128; /* 30 is enough */
1046 score->scopedist = ret;
1048 case IPV6_SADDR_RULE_PREFERRED:
1049 /* Rule 3: Avoid deprecated and optimistic addresses */
1050 ret = ipv6_saddr_preferred(score->addr_type) ||
1051 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1053 #ifdef CONFIG_IPV6_MIP6
1054 case IPV6_SADDR_RULE_HOA:
1056 /* Rule 4: Prefer home address */
1057 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1058 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1062 case IPV6_SADDR_RULE_OIF:
1063 /* Rule 5: Prefer outgoing interface */
1064 ret = (!dst->ifindex ||
1065 dst->ifindex == score->ifa->idev->dev->ifindex);
1067 case IPV6_SADDR_RULE_LABEL:
1068 /* Rule 6: Prefer matching label */
1069 ret = ipv6_addr_label(net,
1070 &score->ifa->addr, score->addr_type,
1071 score->ifa->idev->dev->ifindex) == dst->label;
1073 #ifdef CONFIG_IPV6_PRIVACY
1074 case IPV6_SADDR_RULE_PRIVACY:
1076 /* Rule 7: Prefer public address
1077 * Note: prefer temporary address if use_tempaddr >= 2
1079 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1080 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1081 score->ifa->idev->cnf.use_tempaddr >= 2;
1082 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1086 case IPV6_SADDR_RULE_ORCHID:
1087 /* Rule 8-: Prefer ORCHID vs ORCHID or
1088 * non-ORCHID vs non-ORCHID
1090 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1091 ipv6_addr_orchid(dst->addr));
1093 case IPV6_SADDR_RULE_PREFIX:
1094 /* Rule 8: Use longest matching prefix */
1095 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1103 __set_bit(i, score->scorebits);
1109 int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
1110 const struct in6_addr *daddr, unsigned int prefs,
1111 struct in6_addr *saddr)
1113 struct ipv6_saddr_score scores[2],
1114 *score = &scores[0], *hiscore = &scores[1];
1115 struct ipv6_saddr_dst dst;
1116 struct net_device *dev;
1119 dst_type = __ipv6_addr_type(daddr);
1121 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1122 dst.scope = __ipv6_addr_src_scope(dst_type);
1123 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1127 hiscore->ifa = NULL;
1131 for_each_netdev_rcu(net, dev) {
1132 struct inet6_dev *idev;
1134 /* Candidate Source Address (section 4)
1135 * - multicast and link-local destination address,
1136 * the set of candidate source address MUST only
1137 * include addresses assigned to interfaces
1138 * belonging to the same link as the outgoing
1140 * (- For site-local destination addresses, the
1141 * set of candidate source addresses MUST only
1142 * include addresses assigned to interfaces
1143 * belonging to the same site as the outgoing
1146 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1147 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1148 dst.ifindex && dev->ifindex != dst.ifindex)
1151 idev = __in6_dev_get(dev);
1155 read_lock_bh(&idev->lock);
1156 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1160 * - Tentative Address (RFC2462 section 5.4)
1161 * - A tentative address is not considered
1162 * "assigned to an interface" in the traditional
1163 * sense, unless it is also flagged as optimistic.
1164 * - Candidate Source Address (section 4)
1165 * - In any case, anycast addresses, multicast
1166 * addresses, and the unspecified address MUST
1167 * NOT be included in a candidate set.
1169 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1170 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1173 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1175 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1176 score->addr_type & IPV6_ADDR_MULTICAST)) {
1177 LIMIT_NETDEBUG(KERN_DEBUG
1178 "ADDRCONF: unspecified / multicast address "
1179 "assigned as unicast address on %s",
1185 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1187 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1188 int minihiscore, miniscore;
1190 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1191 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1193 if (minihiscore > miniscore) {
1194 if (i == IPV6_SADDR_RULE_SCOPE &&
1195 score->scopedist > 0) {
1198 * each remaining entry
1199 * has too small (not enough)
1200 * scope, because ifa entries
1201 * are sorted by their scope
1207 } else if (minihiscore < miniscore) {
1209 in6_ifa_put(hiscore->ifa);
1211 in6_ifa_hold(score->ifa);
1213 swap(hiscore, score);
1215 /* restore our iterator */
1216 score->ifa = hiscore->ifa;
1223 read_unlock_bh(&idev->lock);
1228 return -EADDRNOTAVAIL;
1230 ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1231 in6_ifa_put(hiscore->ifa);
1234 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1236 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1237 unsigned char banned_flags)
1239 struct inet6_dev *idev;
1240 int err = -EADDRNOTAVAIL;
1243 idev = __in6_dev_get(dev);
1245 struct inet6_ifaddr *ifp;
1247 read_lock_bh(&idev->lock);
1248 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1249 if (ifp->scope == IFA_LINK &&
1250 !(ifp->flags & banned_flags)) {
1251 ipv6_addr_copy(addr, &ifp->addr);
1256 read_unlock_bh(&idev->lock);
1262 static int ipv6_count_addresses(struct inet6_dev *idev)
1265 struct inet6_ifaddr *ifp;
1267 read_lock_bh(&idev->lock);
1268 list_for_each_entry(ifp, &idev->addr_list, if_list)
1270 read_unlock_bh(&idev->lock);
1274 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1275 struct net_device *dev, int strict)
1277 struct inet6_ifaddr *ifp;
1278 struct hlist_node *node;
1279 unsigned int hash = ipv6_addr_hash(addr);
1282 hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1283 if (!net_eq(dev_net(ifp->idev->dev), net))
1285 if (ipv6_addr_equal(&ifp->addr, addr) &&
1286 !(ifp->flags&IFA_F_TENTATIVE) &&
1287 (dev == NULL || ifp->idev->dev == dev ||
1288 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1289 rcu_read_unlock_bh();
1294 rcu_read_unlock_bh();
1297 EXPORT_SYMBOL(ipv6_chk_addr);
1299 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1300 struct net_device *dev)
1302 unsigned int hash = ipv6_addr_hash(addr);
1303 struct inet6_ifaddr *ifp;
1304 struct hlist_node *node;
1306 hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1307 if (!net_eq(dev_net(ifp->idev->dev), net))
1309 if (ipv6_addr_equal(&ifp->addr, addr)) {
1310 if (dev == NULL || ifp->idev->dev == dev)
1317 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1319 struct inet6_dev *idev;
1320 struct inet6_ifaddr *ifa;
1325 idev = __in6_dev_get(dev);
1327 read_lock_bh(&idev->lock);
1328 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1329 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1334 read_unlock_bh(&idev->lock);
1340 EXPORT_SYMBOL(ipv6_chk_prefix);
1342 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1343 struct net_device *dev, int strict)
1345 struct inet6_ifaddr *ifp, *result = NULL;
1346 unsigned int hash = ipv6_addr_hash(addr);
1347 struct hlist_node *node;
1350 hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1351 if (!net_eq(dev_net(ifp->idev->dev), net))
1353 if (ipv6_addr_equal(&ifp->addr, addr)) {
1354 if (dev == NULL || ifp->idev->dev == dev ||
1355 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1362 rcu_read_unlock_bh();
1367 /* Gets referenced address, destroys ifaddr */
1369 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1371 if (ifp->flags&IFA_F_PERMANENT) {
1372 spin_lock_bh(&ifp->lock);
1373 addrconf_del_timer(ifp);
1374 ifp->flags |= IFA_F_TENTATIVE;
1376 ifp->flags |= IFA_F_DADFAILED;
1377 spin_unlock_bh(&ifp->lock);
1379 ipv6_ifa_notify(0, ifp);
1381 #ifdef CONFIG_IPV6_PRIVACY
1382 } else if (ifp->flags&IFA_F_TEMPORARY) {
1383 struct inet6_ifaddr *ifpub;
1384 spin_lock_bh(&ifp->lock);
1387 in6_ifa_hold(ifpub);
1388 spin_unlock_bh(&ifp->lock);
1389 ipv6_create_tempaddr(ifpub, ifp);
1392 spin_unlock_bh(&ifp->lock);
1400 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1404 spin_lock(&ifp->state_lock);
1405 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1406 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1409 spin_unlock(&ifp->state_lock);
1414 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1416 struct inet6_dev *idev = ifp->idev;
1418 if (addrconf_dad_end(ifp)) {
1423 if (net_ratelimit())
1424 printk(KERN_INFO "%s: IPv6 duplicate address %pI6c detected!\n",
1425 ifp->idev->dev->name, &ifp->addr);
1427 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1428 struct in6_addr addr;
1430 addr.s6_addr32[0] = htonl(0xfe800000);
1431 addr.s6_addr32[1] = 0;
1433 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1434 ipv6_addr_equal(&ifp->addr, &addr)) {
1435 /* DAD failed for link-local based on MAC address */
1436 idev->cnf.disable_ipv6 = 1;
1438 printk(KERN_INFO "%s: IPv6 being disabled!\n",
1439 ifp->idev->dev->name);
1443 addrconf_dad_stop(ifp, 1);
1446 /* Join to solicited addr multicast group. */
1448 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1450 struct in6_addr maddr;
1452 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1455 addrconf_addr_solict_mult(addr, &maddr);
1456 ipv6_dev_mc_inc(dev, &maddr);
1459 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1461 struct in6_addr maddr;
1463 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1466 addrconf_addr_solict_mult(addr, &maddr);
1467 __ipv6_dev_mc_dec(idev, &maddr);
1470 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1472 struct in6_addr addr;
1473 if (ifp->prefix_len == 127) /* RFC 6164 */
1475 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1476 if (ipv6_addr_any(&addr))
1478 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1481 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1483 struct in6_addr addr;
1484 if (ifp->prefix_len == 127) /* RFC 6164 */
1486 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1487 if (ipv6_addr_any(&addr))
1489 __ipv6_dev_ac_dec(ifp->idev, &addr);
1492 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1494 if (dev->addr_len != ETH_ALEN)
1496 memcpy(eui, dev->dev_addr, 3);
1497 memcpy(eui + 5, dev->dev_addr + 3, 3);
1500 * The zSeries OSA network cards can be shared among various
1501 * OS instances, but the OSA cards have only one MAC address.
1502 * This leads to duplicate address conflicts in conjunction
1503 * with IPv6 if more than one instance uses the same card.
1505 * The driver for these cards can deliver a unique 16-bit
1506 * identifier for each instance sharing the same card. It is
1507 * placed instead of 0xFFFE in the interface identifier. The
1508 * "u" bit of the interface identifier is not inverted in this
1509 * case. Hence the resulting interface identifier has local
1510 * scope according to RFC2373.
1513 eui[3] = (dev->dev_id >> 8) & 0xFF;
1514 eui[4] = dev->dev_id & 0xFF;
1523 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1525 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1526 if (dev->addr_len != ARCNET_ALEN)
1529 eui[7] = *(u8*)dev->dev_addr;
1533 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1535 if (dev->addr_len != INFINIBAND_ALEN)
1537 memcpy(eui, dev->dev_addr + 12, 8);
1542 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1546 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1547 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1548 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1549 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1550 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1551 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1555 memcpy(eui + 4, &addr, 4);
1559 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1561 if (dev->priv_flags & IFF_ISATAP)
1562 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1566 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1568 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1571 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1573 switch (dev->type) {
1576 case ARPHRD_IEEE802_TR:
1577 return addrconf_ifid_eui48(eui, dev);
1579 return addrconf_ifid_arcnet(eui, dev);
1580 case ARPHRD_INFINIBAND:
1581 return addrconf_ifid_infiniband(eui, dev);
1583 return addrconf_ifid_sit(eui, dev);
1585 return addrconf_ifid_gre(eui, dev);
1590 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1593 struct inet6_ifaddr *ifp;
1595 read_lock_bh(&idev->lock);
1596 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1597 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1598 memcpy(eui, ifp->addr.s6_addr+8, 8);
1603 read_unlock_bh(&idev->lock);
1607 #ifdef CONFIG_IPV6_PRIVACY
1608 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1609 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1612 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1613 idev->rndid[0] &= ~0x02;
1616 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1617 * check if generated address is not inappropriate
1619 * - Reserved subnet anycast (RFC 2526)
1620 * 11111101 11....11 1xxxxxxx
1621 * - ISATAP (RFC4214) 6.1
1622 * 00-00-5E-FE-xx-xx-xx-xx
1624 * - XXX: already assigned to an address on the device
1626 if (idev->rndid[0] == 0xfd &&
1627 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1628 (idev->rndid[7]&0x80))
1630 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1631 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1633 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1640 static void ipv6_regen_rndid(unsigned long data)
1642 struct inet6_dev *idev = (struct inet6_dev *) data;
1643 unsigned long expires;
1646 write_lock_bh(&idev->lock);
1651 if (__ipv6_regen_rndid(idev) < 0)
1655 idev->cnf.temp_prefered_lft * HZ -
1656 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1657 idev->cnf.max_desync_factor * HZ;
1658 if (time_before(expires, jiffies)) {
1660 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1665 if (!mod_timer(&idev->regen_timer, expires))
1669 write_unlock_bh(&idev->lock);
1670 rcu_read_unlock_bh();
1674 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1677 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1678 ret = __ipv6_regen_rndid(idev);
1688 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1689 unsigned long expires, u32 flags)
1691 struct fib6_config cfg = {
1692 .fc_table = RT6_TABLE_PREFIX,
1693 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1694 .fc_ifindex = dev->ifindex,
1695 .fc_expires = expires,
1697 .fc_flags = RTF_UP | flags,
1698 .fc_nlinfo.nl_net = dev_net(dev),
1699 .fc_protocol = RTPROT_KERNEL,
1702 ipv6_addr_copy(&cfg.fc_dst, pfx);
1704 /* Prevent useless cloning on PtP SIT.
1705 This thing is done here expecting that the whole
1706 class of non-broadcast devices need not cloning.
1708 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1709 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1710 cfg.fc_flags |= RTF_NONEXTHOP;
1713 ip6_route_add(&cfg);
1717 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
1719 const struct net_device *dev,
1720 u32 flags, u32 noflags)
1722 struct fib6_node *fn;
1723 struct rt6_info *rt = NULL;
1724 struct fib6_table *table;
1726 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
1730 write_lock_bh(&table->tb6_lock);
1731 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
1734 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1735 if (rt->rt6i_dev->ifindex != dev->ifindex)
1737 if ((rt->rt6i_flags & flags) != flags)
1739 if ((noflags != 0) && ((rt->rt6i_flags & flags) != 0))
1745 write_unlock_bh(&table->tb6_lock);
1750 /* Create "default" multicast route to the interface */
1752 static void addrconf_add_mroute(struct net_device *dev)
1754 struct fib6_config cfg = {
1755 .fc_table = RT6_TABLE_LOCAL,
1756 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1757 .fc_ifindex = dev->ifindex,
1760 .fc_nlinfo.nl_net = dev_net(dev),
1763 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1765 ip6_route_add(&cfg);
1768 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1769 static void sit_route_add(struct net_device *dev)
1771 struct fib6_config cfg = {
1772 .fc_table = RT6_TABLE_MAIN,
1773 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1774 .fc_ifindex = dev->ifindex,
1776 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1777 .fc_nlinfo.nl_net = dev_net(dev),
1780 /* prefix length - 96 bits "::d.d.d.d" */
1781 ip6_route_add(&cfg);
1785 static void addrconf_add_lroute(struct net_device *dev)
1787 struct in6_addr addr;
1789 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1790 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1793 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1795 struct inet6_dev *idev;
1799 idev = ipv6_find_idev(dev);
1801 return ERR_PTR(-ENOBUFS);
1803 if (idev->cnf.disable_ipv6)
1804 return ERR_PTR(-EACCES);
1806 /* Add default multicast route */
1807 addrconf_add_mroute(dev);
1809 /* Add link local route */
1810 addrconf_add_lroute(dev);
1814 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1816 struct prefix_info *pinfo;
1820 struct inet6_dev *in6_dev;
1821 struct net *net = dev_net(dev);
1823 pinfo = (struct prefix_info *) opt;
1825 if (len < sizeof(struct prefix_info)) {
1826 ADBG(("addrconf: prefix option too short\n"));
1831 * Validation checks ([ADDRCONF], page 19)
1834 addr_type = ipv6_addr_type(&pinfo->prefix);
1836 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1839 valid_lft = ntohl(pinfo->valid);
1840 prefered_lft = ntohl(pinfo->prefered);
1842 if (prefered_lft > valid_lft) {
1843 if (net_ratelimit())
1844 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1848 in6_dev = in6_dev_get(dev);
1850 if (in6_dev == NULL) {
1851 if (net_ratelimit())
1852 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1857 * Two things going on here:
1858 * 1) Add routes for on-link prefixes
1859 * 2) Configure prefixes with the auto flag set
1862 if (pinfo->onlink) {
1863 struct rt6_info *rt;
1864 unsigned long rt_expires;
1866 /* Avoid arithmetic overflow. Really, we could
1867 * save rt_expires in seconds, likely valid_lft,
1868 * but it would require division in fib gc, that it
1872 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1874 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
1876 if (addrconf_finite_timeout(rt_expires))
1879 rt = addrconf_get_prefix_route(&pinfo->prefix,
1882 RTF_ADDRCONF | RTF_PREFIX_RT,
1883 RTF_GATEWAY | RTF_DEFAULT);
1886 /* Autoconf prefix route */
1887 if (valid_lft == 0) {
1890 } else if (addrconf_finite_timeout(rt_expires)) {
1892 rt->rt6i_expires = jiffies + rt_expires;
1893 rt->rt6i_flags |= RTF_EXPIRES;
1895 rt->rt6i_flags &= ~RTF_EXPIRES;
1896 rt->rt6i_expires = 0;
1898 } else if (valid_lft) {
1899 clock_t expires = 0;
1900 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1901 if (addrconf_finite_timeout(rt_expires)) {
1903 flags |= RTF_EXPIRES;
1904 expires = jiffies_to_clock_t(rt_expires);
1906 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1907 dev, expires, flags);
1910 dst_release(&rt->dst);
1913 /* Try to figure out our local address for this prefix */
1915 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1916 struct inet6_ifaddr * ifp;
1917 struct in6_addr addr;
1918 int create = 0, update_lft = 0;
1920 if (pinfo->prefix_len == 64) {
1921 memcpy(&addr, &pinfo->prefix, 8);
1922 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1923 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1924 in6_dev_put(in6_dev);
1929 if (net_ratelimit())
1930 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1932 in6_dev_put(in6_dev);
1937 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1939 if (ifp == NULL && valid_lft) {
1940 int max_addresses = in6_dev->cnf.max_addresses;
1943 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1944 if (in6_dev->cnf.optimistic_dad &&
1945 !net->ipv6.devconf_all->forwarding)
1946 addr_flags = IFA_F_OPTIMISTIC;
1949 /* Do not allow to create too much of autoconfigured
1950 * addresses; this would be too easy way to crash kernel.
1952 if (!max_addresses ||
1953 ipv6_count_addresses(in6_dev) < max_addresses)
1954 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1955 addr_type&IPV6_ADDR_SCOPE_MASK,
1958 if (!ifp || IS_ERR(ifp)) {
1959 in6_dev_put(in6_dev);
1963 update_lft = create = 1;
1964 ifp->cstamp = jiffies;
1965 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1971 #ifdef CONFIG_IPV6_PRIVACY
1972 struct inet6_ifaddr *ift;
1976 /* update lifetime (RFC2462 5.5.3 e) */
1977 spin_lock(&ifp->lock);
1979 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1980 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1983 if (!update_lft && stored_lft) {
1984 if (valid_lft > MIN_VALID_LIFETIME ||
1985 valid_lft > stored_lft)
1987 else if (stored_lft <= MIN_VALID_LIFETIME) {
1988 /* valid_lft <= stored_lft is always true */
1990 * RFC 4862 Section 5.5.3e:
1991 * "Note that the preferred lifetime of
1992 * the corresponding address is always
1993 * reset to the Preferred Lifetime in
1994 * the received Prefix Information
1995 * option, regardless of whether the
1996 * valid lifetime is also reset or
1999 * So if the preferred lifetime in
2000 * this advertisement is different
2001 * than what we have stored, but the
2002 * valid lifetime is invalid, just
2003 * reset prefered_lft.
2005 * We must set the valid lifetime
2006 * to the stored lifetime since we'll
2007 * be updating the timestamp below,
2008 * else we'll set it back to the
2011 if (prefered_lft != ifp->prefered_lft) {
2012 valid_lft = stored_lft;
2016 valid_lft = MIN_VALID_LIFETIME;
2017 if (valid_lft < prefered_lft)
2018 prefered_lft = valid_lft;
2024 ifp->valid_lft = valid_lft;
2025 ifp->prefered_lft = prefered_lft;
2028 ifp->flags &= ~IFA_F_DEPRECATED;
2029 spin_unlock(&ifp->lock);
2031 if (!(flags&IFA_F_TENTATIVE))
2032 ipv6_ifa_notify(0, ifp);
2034 spin_unlock(&ifp->lock);
2036 #ifdef CONFIG_IPV6_PRIVACY
2037 read_lock_bh(&in6_dev->lock);
2038 /* update all temporary addresses in the list */
2039 list_for_each_entry(ift, &in6_dev->tempaddr_list,
2041 int age, max_valid, max_prefered;
2043 if (ifp != ift->ifpub)
2047 * RFC 4941 section 3.3:
2048 * If a received option will extend the lifetime
2049 * of a public address, the lifetimes of
2050 * temporary addresses should be extended,
2051 * subject to the overall constraint that no
2052 * temporary addresses should ever remain
2053 * "valid" or "preferred" for a time longer than
2054 * (TEMP_VALID_LIFETIME) or
2055 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR),
2058 age = (now - ift->cstamp) / HZ;
2059 max_valid = in6_dev->cnf.temp_valid_lft - age;
2063 max_prefered = in6_dev->cnf.temp_prefered_lft -
2064 in6_dev->cnf.max_desync_factor -
2066 if (max_prefered < 0)
2069 if (valid_lft > max_valid)
2070 valid_lft = max_valid;
2072 if (prefered_lft > max_prefered)
2073 prefered_lft = max_prefered;
2075 spin_lock(&ift->lock);
2077 ift->valid_lft = valid_lft;
2078 ift->prefered_lft = prefered_lft;
2080 if (prefered_lft > 0)
2081 ift->flags &= ~IFA_F_DEPRECATED;
2083 spin_unlock(&ift->lock);
2084 if (!(flags&IFA_F_TENTATIVE))
2085 ipv6_ifa_notify(0, ift);
2088 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
2090 * When a new public address is created as
2091 * described in [ADDRCONF], also create a new
2092 * temporary address. Also create a temporary
2093 * address if it's enabled but no temporary
2094 * address currently exists.
2096 read_unlock_bh(&in6_dev->lock);
2097 ipv6_create_tempaddr(ifp, NULL);
2099 read_unlock_bh(&in6_dev->lock);
2106 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2107 in6_dev_put(in6_dev);
2111 * Set destination address.
2112 * Special case for SIT interfaces where we create a new "virtual"
2115 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2117 struct in6_ifreq ireq;
2118 struct net_device *dev;
2124 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2127 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2133 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2134 if (dev->type == ARPHRD_SIT) {
2135 const struct net_device_ops *ops = dev->netdev_ops;
2137 struct ip_tunnel_parm p;
2139 err = -EADDRNOTAVAIL;
2140 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2143 memset(&p, 0, sizeof(p));
2144 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2148 p.iph.protocol = IPPROTO_IPV6;
2150 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2152 if (ops->ndo_do_ioctl) {
2153 mm_segment_t oldfs = get_fs();
2156 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2163 dev = __dev_get_by_name(net, p.name);
2166 err = dev_open(dev);
2177 * Manual configuration of address on an interface
2179 static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx,
2180 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2183 struct inet6_ifaddr *ifp;
2184 struct inet6_dev *idev;
2185 struct net_device *dev;
2189 unsigned long timeout;
2196 /* check the lifetime */
2197 if (!valid_lft || prefered_lft > valid_lft)
2200 dev = __dev_get_by_index(net, ifindex);
2204 idev = addrconf_add_dev(dev);
2206 return PTR_ERR(idev);
2208 scope = ipv6_addr_scope(pfx);
2210 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2211 if (addrconf_finite_timeout(timeout)) {
2212 expires = jiffies_to_clock_t(timeout * HZ);
2213 valid_lft = timeout;
2214 flags = RTF_EXPIRES;
2218 ifa_flags |= IFA_F_PERMANENT;
2221 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2222 if (addrconf_finite_timeout(timeout)) {
2224 ifa_flags |= IFA_F_DEPRECATED;
2225 prefered_lft = timeout;
2228 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2231 spin_lock_bh(&ifp->lock);
2232 ifp->valid_lft = valid_lft;
2233 ifp->prefered_lft = prefered_lft;
2234 ifp->tstamp = jiffies;
2235 spin_unlock_bh(&ifp->lock);
2237 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2240 * Note that section 3.1 of RFC 4429 indicates
2241 * that the Optimistic flag should not be set for
2242 * manually configured addresses
2244 addrconf_dad_start(ifp, 0);
2250 return PTR_ERR(ifp);
2253 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
2256 struct inet6_ifaddr *ifp;
2257 struct inet6_dev *idev;
2258 struct net_device *dev;
2263 dev = __dev_get_by_index(net, ifindex);
2267 if ((idev = __in6_dev_get(dev)) == NULL)
2270 read_lock_bh(&idev->lock);
2271 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2272 if (ifp->prefix_len == plen &&
2273 ipv6_addr_equal(pfx, &ifp->addr)) {
2275 read_unlock_bh(&idev->lock);
2279 /* If the last address is deleted administratively,
2280 disable IPv6 on this interface.
2282 if (list_empty(&idev->addr_list))
2283 addrconf_ifdown(idev->dev, 1);
2287 read_unlock_bh(&idev->lock);
2288 return -EADDRNOTAVAIL;
2292 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2294 struct in6_ifreq ireq;
2297 if (!capable(CAP_NET_ADMIN))
2300 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2304 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2305 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2306 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2311 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2313 struct in6_ifreq ireq;
2316 if (!capable(CAP_NET_ADMIN))
2319 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2323 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2324 ireq.ifr6_prefixlen);
2329 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2330 int plen, int scope)
2332 struct inet6_ifaddr *ifp;
2334 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2336 spin_lock_bh(&ifp->lock);
2337 ifp->flags &= ~IFA_F_TENTATIVE;
2338 spin_unlock_bh(&ifp->lock);
2339 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2344 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2345 static void sit_add_v4_addrs(struct inet6_dev *idev)
2347 struct in6_addr addr;
2348 struct net_device *dev;
2349 struct net *net = dev_net(idev->dev);
2354 memset(&addr, 0, sizeof(struct in6_addr));
2355 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2357 if (idev->dev->flags&IFF_POINTOPOINT) {
2358 addr.s6_addr32[0] = htonl(0xfe800000);
2361 scope = IPV6_ADDR_COMPATv4;
2364 if (addr.s6_addr32[3]) {
2365 add_addr(idev, &addr, 128, scope);
2369 for_each_netdev(net, dev) {
2370 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2371 if (in_dev && (dev->flags & IFF_UP)) {
2372 struct in_ifaddr * ifa;
2376 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2379 addr.s6_addr32[3] = ifa->ifa_local;
2381 if (ifa->ifa_scope == RT_SCOPE_LINK)
2383 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2384 if (idev->dev->flags&IFF_POINTOPOINT)
2388 if (idev->dev->flags&IFF_POINTOPOINT)
2393 add_addr(idev, &addr, plen, flag);
2400 static void init_loopback(struct net_device *dev)
2402 struct inet6_dev *idev;
2408 if ((idev = ipv6_find_idev(dev)) == NULL) {
2409 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2413 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2416 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
2418 struct inet6_ifaddr * ifp;
2419 u32 addr_flags = IFA_F_PERMANENT;
2421 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2422 if (idev->cnf.optimistic_dad &&
2423 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2424 addr_flags |= IFA_F_OPTIMISTIC;
2428 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2430 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2431 addrconf_dad_start(ifp, 0);
2436 static void addrconf_dev_config(struct net_device *dev)
2438 struct in6_addr addr;
2439 struct inet6_dev * idev;
2443 if ((dev->type != ARPHRD_ETHER) &&
2444 (dev->type != ARPHRD_FDDI) &&
2445 (dev->type != ARPHRD_IEEE802_TR) &&
2446 (dev->type != ARPHRD_ARCNET) &&
2447 (dev->type != ARPHRD_INFINIBAND)) {
2448 /* Alas, we support only Ethernet autoconfiguration. */
2452 idev = addrconf_add_dev(dev);
2456 memset(&addr, 0, sizeof(struct in6_addr));
2457 addr.s6_addr32[0] = htonl(0xFE800000);
2459 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2460 addrconf_add_linklocal(idev, &addr);
2463 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2464 static void addrconf_sit_config(struct net_device *dev)
2466 struct inet6_dev *idev;
2471 * Configure the tunnel with one of our IPv4
2472 * addresses... we should configure all of
2473 * our v4 addrs in the tunnel
2476 if ((idev = ipv6_find_idev(dev)) == NULL) {
2477 printk(KERN_DEBUG "init sit: add_dev failed\n");
2481 if (dev->priv_flags & IFF_ISATAP) {
2482 struct in6_addr addr;
2484 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2485 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2486 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2487 addrconf_add_linklocal(idev, &addr);
2491 sit_add_v4_addrs(idev);
2493 if (dev->flags&IFF_POINTOPOINT) {
2494 addrconf_add_mroute(dev);
2495 addrconf_add_lroute(dev);
2501 #if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE)
2502 static void addrconf_gre_config(struct net_device *dev)
2504 struct inet6_dev *idev;
2505 struct in6_addr addr;
2507 pr_info("ipv6: addrconf_gre_config(%s)\n", dev->name);
2511 if ((idev = ipv6_find_idev(dev)) == NULL) {
2512 printk(KERN_DEBUG "init gre: add_dev failed\n");
2516 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2517 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2519 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2520 addrconf_add_linklocal(idev, &addr);
2525 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2527 struct in6_addr lladdr;
2529 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2530 addrconf_add_linklocal(idev, &lladdr);
2536 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2538 struct net_device *link_dev;
2539 struct net *net = dev_net(idev->dev);
2541 /* first try to inherit the link-local address from the link device */
2542 if (idev->dev->iflink &&
2543 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2544 if (!ipv6_inherit_linklocal(idev, link_dev))
2547 /* then try to inherit it from any device */
2548 for_each_netdev(net, link_dev) {
2549 if (!ipv6_inherit_linklocal(idev, link_dev))
2552 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2556 * Autoconfigure tunnel with a link-local address so routing protocols,
2557 * DHCPv6, MLD etc. can be run over the virtual link
2560 static void addrconf_ip6_tnl_config(struct net_device *dev)
2562 struct inet6_dev *idev;
2566 idev = addrconf_add_dev(dev);
2568 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2571 ip6_tnl_add_linklocal(idev);
2574 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2577 struct net_device *dev = (struct net_device *) data;
2578 struct inet6_dev *idev = __in6_dev_get(dev);
2579 int run_pending = 0;
2583 case NETDEV_REGISTER:
2584 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2585 idev = ipv6_add_dev(dev);
2587 return notifier_from_errno(-ENOMEM);
2593 if (dev->flags & IFF_SLAVE)
2596 if (event == NETDEV_UP) {
2597 if (!addrconf_qdisc_ok(dev)) {
2598 /* device is not ready yet. */
2600 "ADDRCONF(NETDEV_UP): %s: "
2601 "link is not ready\n",
2606 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2607 idev = ipv6_add_dev(dev);
2610 idev->if_flags |= IF_READY;
2614 if (!addrconf_qdisc_ok(dev)) {
2615 /* device is still not ready. */
2620 if (idev->if_flags & IF_READY)
2621 /* device is already configured. */
2623 idev->if_flags |= IF_READY;
2627 "ADDRCONF(NETDEV_CHANGE): %s: "
2628 "link becomes ready\n",
2634 switch (dev->type) {
2635 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2637 addrconf_sit_config(dev);
2640 #if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE)
2642 addrconf_gre_config(dev);
2645 case ARPHRD_TUNNEL6:
2646 addrconf_ip6_tnl_config(dev);
2648 case ARPHRD_LOOPBACK:
2653 addrconf_dev_config(dev);
2659 addrconf_dad_run(idev);
2662 * If the MTU changed during the interface down,
2663 * when the interface up, the changed MTU must be
2664 * reflected in the idev as well as routers.
2666 if (idev->cnf.mtu6 != dev->mtu &&
2667 dev->mtu >= IPV6_MIN_MTU) {
2668 rt6_mtu_change(dev, dev->mtu);
2669 idev->cnf.mtu6 = dev->mtu;
2671 idev->tstamp = jiffies;
2672 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2675 * If the changed mtu during down is lower than
2676 * IPV6_MIN_MTU stop IPv6 on this interface.
2678 if (dev->mtu < IPV6_MIN_MTU)
2679 addrconf_ifdown(dev, 1);
2683 case NETDEV_CHANGEMTU:
2684 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2685 rt6_mtu_change(dev, dev->mtu);
2686 idev->cnf.mtu6 = dev->mtu;
2690 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2691 idev = ipv6_add_dev(dev);
2697 * MTU falled under IPV6_MIN_MTU.
2698 * Stop IPv6 on this interface.
2702 case NETDEV_UNREGISTER:
2704 * Remove all addresses from this interface.
2706 addrconf_ifdown(dev, event != NETDEV_DOWN);
2709 case NETDEV_CHANGENAME:
2711 snmp6_unregister_dev(idev);
2712 addrconf_sysctl_unregister(idev);
2713 addrconf_sysctl_register(idev);
2714 err = snmp6_register_dev(idev);
2716 return notifier_from_errno(err);
2720 case NETDEV_PRE_TYPE_CHANGE:
2721 case NETDEV_POST_TYPE_CHANGE:
2722 addrconf_type_change(dev, event);
2730 * addrconf module should be notified of a device going up
2732 static struct notifier_block ipv6_dev_notf = {
2733 .notifier_call = addrconf_notify,
2736 static void addrconf_type_change(struct net_device *dev, unsigned long event)
2738 struct inet6_dev *idev;
2741 idev = __in6_dev_get(dev);
2743 if (event == NETDEV_POST_TYPE_CHANGE)
2744 ipv6_mc_remap(idev);
2745 else if (event == NETDEV_PRE_TYPE_CHANGE)
2746 ipv6_mc_unmap(idev);
2749 static int addrconf_ifdown(struct net_device *dev, int how)
2751 struct net *net = dev_net(dev);
2752 struct inet6_dev *idev;
2753 struct inet6_ifaddr *ifa;
2758 rt6_ifdown(net, dev);
2759 neigh_ifdown(&nd_tbl, dev);
2761 idev = __in6_dev_get(dev);
2766 * Step 1: remove reference to ipv6 device from parent device.
2772 /* protected by rtnl_lock */
2773 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
2775 /* Step 1.5: remove snmp6 entry */
2776 snmp6_unregister_dev(idev);
2780 /* Step 2: clear hash table */
2781 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
2782 struct hlist_head *h = &inet6_addr_lst[i];
2783 struct hlist_node *n;
2785 spin_lock_bh(&addrconf_hash_lock);
2787 hlist_for_each_entry_rcu(ifa, n, h, addr_lst) {
2788 if (ifa->idev == idev) {
2789 hlist_del_init_rcu(&ifa->addr_lst);
2790 addrconf_del_timer(ifa);
2794 spin_unlock_bh(&addrconf_hash_lock);
2797 write_lock_bh(&idev->lock);
2799 /* Step 2: clear flags for stateless addrconf */
2801 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2803 #ifdef CONFIG_IPV6_PRIVACY
2804 if (how && del_timer(&idev->regen_timer))
2807 /* Step 3: clear tempaddr list */
2808 while (!list_empty(&idev->tempaddr_list)) {
2809 ifa = list_first_entry(&idev->tempaddr_list,
2810 struct inet6_ifaddr, tmp_list);
2811 list_del(&ifa->tmp_list);
2812 write_unlock_bh(&idev->lock);
2813 spin_lock_bh(&ifa->lock);
2816 in6_ifa_put(ifa->ifpub);
2819 spin_unlock_bh(&ifa->lock);
2821 write_lock_bh(&idev->lock);
2825 while (!list_empty(&idev->addr_list)) {
2826 ifa = list_first_entry(&idev->addr_list,
2827 struct inet6_ifaddr, if_list);
2828 addrconf_del_timer(ifa);
2830 list_del(&ifa->if_list);
2832 write_unlock_bh(&idev->lock);
2834 spin_lock_bh(&ifa->state_lock);
2836 ifa->state = INET6_IFADDR_STATE_DEAD;
2837 spin_unlock_bh(&ifa->state_lock);
2839 if (state != INET6_IFADDR_STATE_DEAD) {
2840 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2841 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2845 write_lock_bh(&idev->lock);
2848 write_unlock_bh(&idev->lock);
2850 /* Step 5: Discard multicast list */
2852 ipv6_mc_destroy_dev(idev);
2856 idev->tstamp = jiffies;
2858 /* Last: Shot the device (if unregistered) */
2860 addrconf_sysctl_unregister(idev);
2861 neigh_parms_release(&nd_tbl, idev->nd_parms);
2862 neigh_ifdown(&nd_tbl, dev);
2868 static void addrconf_rs_timer(unsigned long data)
2870 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2871 struct inet6_dev *idev = ifp->idev;
2873 read_lock(&idev->lock);
2874 if (idev->dead || !(idev->if_flags & IF_READY))
2877 if (idev->cnf.forwarding)
2880 /* Announcement received after solicitation was sent */
2881 if (idev->if_flags & IF_RA_RCVD)
2884 spin_lock(&ifp->lock);
2885 if (ifp->probes++ < idev->cnf.rtr_solicits) {
2886 /* The wait after the last probe can be shorter */
2887 addrconf_mod_timer(ifp, AC_RS,
2888 (ifp->probes == idev->cnf.rtr_solicits) ?
2889 idev->cnf.rtr_solicit_delay :
2890 idev->cnf.rtr_solicit_interval);
2891 spin_unlock(&ifp->lock);
2893 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2895 spin_unlock(&ifp->lock);
2897 * Note: we do not support deprecated "all on-link"
2898 * assumption any longer.
2900 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2905 read_unlock(&idev->lock);
2910 * Duplicate Address Detection
2912 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2914 unsigned long rand_num;
2915 struct inet6_dev *idev = ifp->idev;
2917 if (ifp->flags & IFA_F_OPTIMISTIC)
2920 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2922 ifp->probes = idev->cnf.dad_transmits;
2923 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2926 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2928 struct inet6_dev *idev = ifp->idev;
2929 struct net_device *dev = idev->dev;
2931 addrconf_join_solict(dev, &ifp->addr);
2933 net_srandom(ifp->addr.s6_addr32[3]);
2935 read_lock_bh(&idev->lock);
2936 spin_lock(&ifp->lock);
2937 if (ifp->state == INET6_IFADDR_STATE_DEAD)
2940 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2941 idev->cnf.accept_dad < 1 ||
2942 !(ifp->flags&IFA_F_TENTATIVE) ||
2943 ifp->flags & IFA_F_NODAD) {
2944 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2945 spin_unlock(&ifp->lock);
2946 read_unlock_bh(&idev->lock);
2948 addrconf_dad_completed(ifp);
2952 if (!(idev->if_flags & IF_READY)) {
2953 spin_unlock(&ifp->lock);
2954 read_unlock_bh(&idev->lock);
2956 * If the device is not ready:
2957 * - keep it tentative if it is a permanent address.
2958 * - otherwise, kill it.
2961 addrconf_dad_stop(ifp, 0);
2966 * Optimistic nodes can start receiving
2969 if (ifp->flags & IFA_F_OPTIMISTIC)
2970 ip6_ins_rt(ifp->rt);
2972 addrconf_dad_kick(ifp);
2974 spin_unlock(&ifp->lock);
2975 read_unlock_bh(&idev->lock);
2978 static void addrconf_dad_timer(unsigned long data)
2980 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2981 struct inet6_dev *idev = ifp->idev;
2982 struct in6_addr mcaddr;
2984 if (!ifp->probes && addrconf_dad_end(ifp))
2987 read_lock(&idev->lock);
2988 if (idev->dead || !(idev->if_flags & IF_READY)) {
2989 read_unlock(&idev->lock);
2993 spin_lock(&ifp->lock);
2994 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
2995 spin_unlock(&ifp->lock);
2996 read_unlock(&idev->lock);
3000 if (ifp->probes == 0) {
3002 * DAD was successful
3005 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3006 spin_unlock(&ifp->lock);
3007 read_unlock(&idev->lock);
3009 addrconf_dad_completed(ifp);
3015 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
3016 spin_unlock(&ifp->lock);
3017 read_unlock(&idev->lock);
3019 /* send a neighbour solicitation for our addr */
3020 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3021 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
3026 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3028 struct net_device *dev = ifp->idev->dev;
3031 * Configure the address for reception. Now it is valid.
3034 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3036 /* If added prefix is link local and we are prepared to process
3037 router advertisements, start sending router solicitations.
3040 if (((ifp->idev->cnf.accept_ra == 1 && !ifp->idev->cnf.forwarding) ||
3041 ifp->idev->cnf.accept_ra == 2) &&
3042 ifp->idev->cnf.rtr_solicits > 0 &&
3043 (dev->flags&IFF_LOOPBACK) == 0 &&
3044 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
3046 * If a host as already performed a random delay
3047 * [...] as part of DAD [...] there is no need
3048 * to delay again before sending the first RS
3050 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
3052 spin_lock_bh(&ifp->lock);
3054 ifp->idev->if_flags |= IF_RS_SENT;
3055 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
3056 spin_unlock_bh(&ifp->lock);
3060 static void addrconf_dad_run(struct inet6_dev *idev)
3062 struct inet6_ifaddr *ifp;
3064 read_lock_bh(&idev->lock);
3065 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3066 spin_lock(&ifp->lock);
3067 if (ifp->flags & IFA_F_TENTATIVE &&
3068 ifp->state == INET6_IFADDR_STATE_DAD)
3069 addrconf_dad_kick(ifp);
3070 spin_unlock(&ifp->lock);
3072 read_unlock_bh(&idev->lock);
3075 #ifdef CONFIG_PROC_FS
3076 struct if6_iter_state {
3077 struct seq_net_private p;
3081 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
3083 struct inet6_ifaddr *ifa = NULL;
3084 struct if6_iter_state *state = seq->private;
3085 struct net *net = seq_file_net(seq);
3087 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3088 struct hlist_node *n;
3089 hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket],
3091 if (net_eq(dev_net(ifa->idev->dev), net))
3097 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3098 struct inet6_ifaddr *ifa)
3100 struct if6_iter_state *state = seq->private;
3101 struct net *net = seq_file_net(seq);
3102 struct hlist_node *n = &ifa->addr_lst;
3104 hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst)
3105 if (net_eq(dev_net(ifa->idev->dev), net))
3108 while (++state->bucket < IN6_ADDR_HSIZE) {
3109 hlist_for_each_entry_rcu_bh(ifa, n,
3110 &inet6_addr_lst[state->bucket], addr_lst) {
3111 if (net_eq(dev_net(ifa->idev->dev), net))
3119 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
3121 struct inet6_ifaddr *ifa = if6_get_first(seq);
3124 while (pos && (ifa = if6_get_next(seq, ifa)) != NULL)
3126 return pos ? NULL : ifa;
3129 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3133 return if6_get_idx(seq, *pos);
3136 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3138 struct inet6_ifaddr *ifa;
3140 ifa = if6_get_next(seq, v);
3145 static void if6_seq_stop(struct seq_file *seq, void *v)
3148 rcu_read_unlock_bh();
3151 static int if6_seq_show(struct seq_file *seq, void *v)
3153 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3154 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3156 ifp->idev->dev->ifindex,
3160 ifp->idev->dev->name);
3164 static const struct seq_operations if6_seq_ops = {
3165 .start = if6_seq_start,
3166 .next = if6_seq_next,
3167 .show = if6_seq_show,
3168 .stop = if6_seq_stop,
3171 static int if6_seq_open(struct inode *inode, struct file *file)
3173 return seq_open_net(inode, file, &if6_seq_ops,
3174 sizeof(struct if6_iter_state));
3177 static const struct file_operations if6_fops = {
3178 .owner = THIS_MODULE,
3179 .open = if6_seq_open,
3181 .llseek = seq_lseek,
3182 .release = seq_release_net,
3185 static int __net_init if6_proc_net_init(struct net *net)
3187 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
3192 static void __net_exit if6_proc_net_exit(struct net *net)
3194 proc_net_remove(net, "if_inet6");
3197 static struct pernet_operations if6_proc_net_ops = {
3198 .init = if6_proc_net_init,
3199 .exit = if6_proc_net_exit,
3202 int __init if6_proc_init(void)
3204 return register_pernet_subsys(&if6_proc_net_ops);
3207 void if6_proc_exit(void)
3209 unregister_pernet_subsys(&if6_proc_net_ops);
3211 #endif /* CONFIG_PROC_FS */
3213 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3214 /* Check if address is a home address configured on any interface. */
3215 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3218 struct inet6_ifaddr *ifp = NULL;
3219 struct hlist_node *n;
3220 unsigned int hash = ipv6_addr_hash(addr);
3223 hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) {
3224 if (!net_eq(dev_net(ifp->idev->dev), net))
3226 if (ipv6_addr_equal(&ifp->addr, addr) &&
3227 (ifp->flags & IFA_F_HOMEADDRESS)) {
3232 rcu_read_unlock_bh();
3238 * Periodic address status verification
3241 static void addrconf_verify(unsigned long foo)
3243 unsigned long now, next, next_sec, next_sched;
3244 struct inet6_ifaddr *ifp;
3245 struct hlist_node *node;
3249 spin_lock(&addrconf_verify_lock);
3251 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3253 del_timer(&addr_chk_timer);
3255 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3257 hlist_for_each_entry_rcu_bh(ifp, node,
3258 &inet6_addr_lst[i], addr_lst) {
3261 if (ifp->flags & IFA_F_PERMANENT)
3264 spin_lock(&ifp->lock);
3265 /* We try to batch several events at once. */
3266 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3268 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3269 age >= ifp->valid_lft) {
3270 spin_unlock(&ifp->lock);
3274 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3275 spin_unlock(&ifp->lock);
3277 } else if (age >= ifp->prefered_lft) {
3278 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3281 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3283 ifp->flags |= IFA_F_DEPRECATED;
3286 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3287 next = ifp->tstamp + ifp->valid_lft * HZ;
3289 spin_unlock(&ifp->lock);
3294 ipv6_ifa_notify(0, ifp);
3298 #ifdef CONFIG_IPV6_PRIVACY
3299 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3300 !(ifp->flags&IFA_F_TENTATIVE)) {
3301 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3302 ifp->idev->cnf.dad_transmits *
3303 ifp->idev->nd_parms->retrans_time / HZ;
3305 if (age >= ifp->prefered_lft - regen_advance) {
3306 struct inet6_ifaddr *ifpub = ifp->ifpub;
3307 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3308 next = ifp->tstamp + ifp->prefered_lft * HZ;
3309 if (!ifp->regen_count && ifpub) {
3312 in6_ifa_hold(ifpub);
3313 spin_unlock(&ifp->lock);
3315 spin_lock(&ifpub->lock);
3316 ifpub->regen_count = 0;
3317 spin_unlock(&ifpub->lock);
3318 ipv6_create_tempaddr(ifpub, ifp);
3323 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3324 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3325 spin_unlock(&ifp->lock);
3328 /* ifp->prefered_lft <= ifp->valid_lft */
3329 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3330 next = ifp->tstamp + ifp->prefered_lft * HZ;
3331 spin_unlock(&ifp->lock);
3336 next_sec = round_jiffies_up(next);
3339 /* If rounded timeout is accurate enough, accept it. */
3340 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3341 next_sched = next_sec;
3343 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3344 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3345 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3347 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3348 now, next, next_sec, next_sched));
3350 addr_chk_timer.expires = next_sched;
3351 add_timer(&addr_chk_timer);
3352 spin_unlock(&addrconf_verify_lock);
3353 rcu_read_unlock_bh();
3356 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3358 struct in6_addr *pfx = NULL;
3361 pfx = nla_data(addr);
3364 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3367 pfx = nla_data(local);
3373 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3374 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3375 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3376 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3380 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3382 struct net *net = sock_net(skb->sk);
3383 struct ifaddrmsg *ifm;
3384 struct nlattr *tb[IFA_MAX+1];
3385 struct in6_addr *pfx;
3388 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3392 ifm = nlmsg_data(nlh);
3393 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3397 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3400 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3401 u32 prefered_lft, u32 valid_lft)
3405 unsigned long timeout;
3407 if (!valid_lft || (prefered_lft > valid_lft))
3410 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3411 if (addrconf_finite_timeout(timeout)) {
3412 expires = jiffies_to_clock_t(timeout * HZ);
3413 valid_lft = timeout;
3414 flags = RTF_EXPIRES;
3418 ifa_flags |= IFA_F_PERMANENT;
3421 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3422 if (addrconf_finite_timeout(timeout)) {
3424 ifa_flags |= IFA_F_DEPRECATED;
3425 prefered_lft = timeout;
3428 spin_lock_bh(&ifp->lock);
3429 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3430 ifp->tstamp = jiffies;
3431 ifp->valid_lft = valid_lft;
3432 ifp->prefered_lft = prefered_lft;
3434 spin_unlock_bh(&ifp->lock);
3435 if (!(ifp->flags&IFA_F_TENTATIVE))
3436 ipv6_ifa_notify(0, ifp);
3438 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3446 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3448 struct net *net = sock_net(skb->sk);
3449 struct ifaddrmsg *ifm;
3450 struct nlattr *tb[IFA_MAX+1];
3451 struct in6_addr *pfx;
3452 struct inet6_ifaddr *ifa;
3453 struct net_device *dev;
3454 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3458 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3462 ifm = nlmsg_data(nlh);
3463 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3467 if (tb[IFA_CACHEINFO]) {
3468 struct ifa_cacheinfo *ci;
3470 ci = nla_data(tb[IFA_CACHEINFO]);
3471 valid_lft = ci->ifa_valid;
3472 preferred_lft = ci->ifa_prefered;
3474 preferred_lft = INFINITY_LIFE_TIME;
3475 valid_lft = INFINITY_LIFE_TIME;
3478 dev = __dev_get_by_index(net, ifm->ifa_index);
3482 /* We ignore other flags so far. */
3483 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3485 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3488 * It would be best to check for !NLM_F_CREATE here but
3489 * userspace alreay relies on not having to provide this.
3491 return inet6_addr_add(net, ifm->ifa_index, pfx,
3492 ifm->ifa_prefixlen, ifa_flags,
3493 preferred_lft, valid_lft);
3496 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3497 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3500 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3507 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3508 u8 scope, int ifindex)
3510 struct ifaddrmsg *ifm;
3512 ifm = nlmsg_data(nlh);
3513 ifm->ifa_family = AF_INET6;
3514 ifm->ifa_prefixlen = prefixlen;
3515 ifm->ifa_flags = flags;
3516 ifm->ifa_scope = scope;
3517 ifm->ifa_index = ifindex;
3520 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3521 unsigned long tstamp, u32 preferred, u32 valid)
3523 struct ifa_cacheinfo ci;
3525 ci.cstamp = cstamp_delta(cstamp);
3526 ci.tstamp = cstamp_delta(tstamp);
3527 ci.ifa_prefered = preferred;
3528 ci.ifa_valid = valid;
3530 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3533 static inline int rt_scope(int ifa_scope)
3535 if (ifa_scope & IFA_HOST)
3536 return RT_SCOPE_HOST;
3537 else if (ifa_scope & IFA_LINK)
3538 return RT_SCOPE_LINK;
3539 else if (ifa_scope & IFA_SITE)
3540 return RT_SCOPE_SITE;
3542 return RT_SCOPE_UNIVERSE;
3545 static inline int inet6_ifaddr_msgsize(void)
3547 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3548 + nla_total_size(16) /* IFA_ADDRESS */
3549 + nla_total_size(sizeof(struct ifa_cacheinfo));
3552 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3553 u32 pid, u32 seq, int event, unsigned int flags)
3555 struct nlmsghdr *nlh;
3556 u32 preferred, valid;
3558 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3562 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3563 ifa->idev->dev->ifindex);
3565 if (!(ifa->flags&IFA_F_PERMANENT)) {
3566 preferred = ifa->prefered_lft;
3567 valid = ifa->valid_lft;
3568 if (preferred != INFINITY_LIFE_TIME) {
3569 long tval = (jiffies - ifa->tstamp)/HZ;
3570 if (preferred > tval)
3574 if (valid != INFINITY_LIFE_TIME) {
3582 preferred = INFINITY_LIFE_TIME;
3583 valid = INFINITY_LIFE_TIME;
3586 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3587 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3588 nlmsg_cancel(skb, nlh);
3592 return nlmsg_end(skb, nlh);
3595 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3596 u32 pid, u32 seq, int event, u16 flags)
3598 struct nlmsghdr *nlh;
3599 u8 scope = RT_SCOPE_UNIVERSE;
3600 int ifindex = ifmca->idev->dev->ifindex;
3602 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3603 scope = RT_SCOPE_SITE;
3605 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3609 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3610 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3611 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3612 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3613 nlmsg_cancel(skb, nlh);
3617 return nlmsg_end(skb, nlh);
3620 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3621 u32 pid, u32 seq, int event, unsigned int flags)
3623 struct nlmsghdr *nlh;
3624 u8 scope = RT_SCOPE_UNIVERSE;
3625 int ifindex = ifaca->aca_idev->dev->ifindex;
3627 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3628 scope = RT_SCOPE_SITE;
3630 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3634 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3635 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3636 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3637 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3638 nlmsg_cancel(skb, nlh);
3642 return nlmsg_end(skb, nlh);
3651 /* called with rcu_read_lock() */
3652 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3653 struct netlink_callback *cb, enum addr_type_t type,
3654 int s_ip_idx, int *p_ip_idx)
3656 struct ifmcaddr6 *ifmca;
3657 struct ifacaddr6 *ifaca;
3659 int ip_idx = *p_ip_idx;
3661 read_lock_bh(&idev->lock);
3663 case UNICAST_ADDR: {
3664 struct inet6_ifaddr *ifa;
3666 /* unicast address incl. temp addr */
3667 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3668 if (++ip_idx < s_ip_idx)
3670 err = inet6_fill_ifaddr(skb, ifa,
3671 NETLINK_CB(cb->skb).pid,
3680 case MULTICAST_ADDR:
3681 /* multicast address */
3682 for (ifmca = idev->mc_list; ifmca;
3683 ifmca = ifmca->next, ip_idx++) {
3684 if (ip_idx < s_ip_idx)
3686 err = inet6_fill_ifmcaddr(skb, ifmca,
3687 NETLINK_CB(cb->skb).pid,
3696 /* anycast address */
3697 for (ifaca = idev->ac_list; ifaca;
3698 ifaca = ifaca->aca_next, ip_idx++) {
3699 if (ip_idx < s_ip_idx)
3701 err = inet6_fill_ifacaddr(skb, ifaca,
3702 NETLINK_CB(cb->skb).pid,
3713 read_unlock_bh(&idev->lock);
3718 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3719 enum addr_type_t type)
3721 struct net *net = sock_net(skb->sk);
3724 int s_idx, s_ip_idx;
3725 struct net_device *dev;
3726 struct inet6_dev *idev;
3727 struct hlist_head *head;
3728 struct hlist_node *node;
3731 s_idx = idx = cb->args[1];
3732 s_ip_idx = ip_idx = cb->args[2];
3735 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3737 head = &net->dev_index_head[h];
3738 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3741 if (h > s_h || idx > s_idx)
3744 idev = __in6_dev_get(dev);
3748 if (in6_dump_addrs(idev, skb, cb, type,
3749 s_ip_idx, &ip_idx) <= 0)
3759 cb->args[2] = ip_idx;
3764 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3766 enum addr_type_t type = UNICAST_ADDR;
3768 return inet6_dump_addr(skb, cb, type);
3771 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3773 enum addr_type_t type = MULTICAST_ADDR;
3775 return inet6_dump_addr(skb, cb, type);
3779 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3781 enum addr_type_t type = ANYCAST_ADDR;
3783 return inet6_dump_addr(skb, cb, type);
3786 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3789 struct net *net = sock_net(in_skb->sk);
3790 struct ifaddrmsg *ifm;
3791 struct nlattr *tb[IFA_MAX+1];
3792 struct in6_addr *addr = NULL;
3793 struct net_device *dev = NULL;
3794 struct inet6_ifaddr *ifa;
3795 struct sk_buff *skb;
3798 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3802 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3808 ifm = nlmsg_data(nlh);
3810 dev = __dev_get_by_index(net, ifm->ifa_index);
3812 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
3814 err = -EADDRNOTAVAIL;
3818 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
3824 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3825 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3827 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3828 WARN_ON(err == -EMSGSIZE);
3832 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
3839 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3841 struct sk_buff *skb;
3842 struct net *net = dev_net(ifa->idev->dev);
3845 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3849 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3851 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3852 WARN_ON(err == -EMSGSIZE);
3856 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3860 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3863 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3864 __s32 *array, int bytes)
3866 BUG_ON(bytes < (DEVCONF_MAX * 4));
3868 memset(array, 0, bytes);
3869 array[DEVCONF_FORWARDING] = cnf->forwarding;
3870 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3871 array[DEVCONF_MTU6] = cnf->mtu6;
3872 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3873 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3874 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3875 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3876 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3877 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
3878 jiffies_to_msecs(cnf->rtr_solicit_interval);
3879 array[DEVCONF_RTR_SOLICIT_DELAY] =
3880 jiffies_to_msecs(cnf->rtr_solicit_delay);
3881 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3882 #ifdef CONFIG_IPV6_PRIVACY
3883 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3884 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3885 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3886 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3887 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3889 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3890 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3891 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3892 #ifdef CONFIG_IPV6_ROUTER_PREF
3893 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3894 array[DEVCONF_RTR_PROBE_INTERVAL] =
3895 jiffies_to_msecs(cnf->rtr_probe_interval);
3896 #ifdef CONFIG_IPV6_ROUTE_INFO
3897 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3900 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3901 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3902 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3903 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3905 #ifdef CONFIG_IPV6_MROUTE
3906 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3908 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
3909 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
3910 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
3913 static inline size_t inet6_ifla6_size(void)
3915 return nla_total_size(4) /* IFLA_INET6_FLAGS */
3916 + nla_total_size(sizeof(struct ifla_cacheinfo))
3917 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3918 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3919 + nla_total_size(ICMP6_MIB_MAX * 8); /* IFLA_INET6_ICMP6STATS */
3922 static inline size_t inet6_if_nlmsg_size(void)
3924 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3925 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3926 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3927 + nla_total_size(4) /* IFLA_MTU */
3928 + nla_total_size(4) /* IFLA_LINK */
3929 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
3932 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
3933 int items, int bytes)
3936 int pad = bytes - sizeof(u64) * items;
3939 /* Use put_unaligned() because stats may not be aligned for u64. */
3940 put_unaligned(items, &stats[0]);
3941 for (i = 1; i < items; i++)
3942 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
3944 memset(&stats[items], 0, pad);
3947 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
3948 int items, int bytes, size_t syncpoff)
3951 int pad = bytes - sizeof(u64) * items;
3954 /* Use put_unaligned() because stats may not be aligned for u64. */
3955 put_unaligned(items, &stats[0]);
3956 for (i = 1; i < items; i++)
3957 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
3959 memset(&stats[items], 0, pad);
3962 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3966 case IFLA_INET6_STATS:
3967 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
3968 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
3970 case IFLA_INET6_ICMP6STATS:
3971 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
3976 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
3979 struct ifla_cacheinfo ci;
3981 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3983 ci.max_reasm_len = IPV6_MAXPLEN;
3984 ci.tstamp = cstamp_delta(idev->tstamp);
3985 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
3986 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
3987 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3989 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3991 goto nla_put_failure;
3992 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3994 /* XXX - MC not implemented */
3996 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3998 goto nla_put_failure;
3999 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4001 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4003 goto nla_put_failure;
4004 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4012 static size_t inet6_get_link_af_size(const struct net_device *dev)
4014 if (!__in6_dev_get(dev))
4017 return inet6_ifla6_size();
4020 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4022 struct inet6_dev *idev = __in6_dev_get(dev);
4027 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4033 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4034 u32 pid, u32 seq, int event, unsigned int flags)
4036 struct net_device *dev = idev->dev;
4037 struct ifinfomsg *hdr;
4038 struct nlmsghdr *nlh;
4041 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
4045 hdr = nlmsg_data(nlh);
4046 hdr->ifi_family = AF_INET6;
4048 hdr->ifi_type = dev->type;
4049 hdr->ifi_index = dev->ifindex;
4050 hdr->ifi_flags = dev_get_flags(dev);
4051 hdr->ifi_change = 0;
4053 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
4056 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
4058 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
4059 if (dev->ifindex != dev->iflink)
4060 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
4062 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4063 if (protoinfo == NULL)
4064 goto nla_put_failure;
4066 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4067 goto nla_put_failure;
4069 nla_nest_end(skb, protoinfo);
4070 return nlmsg_end(skb, nlh);
4073 nlmsg_cancel(skb, nlh);
4077 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4079 struct net *net = sock_net(skb->sk);
4082 struct net_device *dev;
4083 struct inet6_dev *idev;
4084 struct hlist_head *head;
4085 struct hlist_node *node;
4088 s_idx = cb->args[1];
4091 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4093 head = &net->dev_index_head[h];
4094 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
4097 idev = __in6_dev_get(dev);
4100 if (inet6_fill_ifinfo(skb, idev,
4101 NETLINK_CB(cb->skb).pid,
4103 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4117 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4119 struct sk_buff *skb;
4120 struct net *net = dev_net(idev->dev);
4123 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4127 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4129 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4130 WARN_ON(err == -EMSGSIZE);
4134 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4138 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4141 static inline size_t inet6_prefix_nlmsg_size(void)
4143 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4144 + nla_total_size(sizeof(struct in6_addr))
4145 + nla_total_size(sizeof(struct prefix_cacheinfo));
4148 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4149 struct prefix_info *pinfo, u32 pid, u32 seq,
4150 int event, unsigned int flags)
4152 struct prefixmsg *pmsg;
4153 struct nlmsghdr *nlh;
4154 struct prefix_cacheinfo ci;
4156 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
4160 pmsg = nlmsg_data(nlh);
4161 pmsg->prefix_family = AF_INET6;
4162 pmsg->prefix_pad1 = 0;
4163 pmsg->prefix_pad2 = 0;
4164 pmsg->prefix_ifindex = idev->dev->ifindex;
4165 pmsg->prefix_len = pinfo->prefix_len;
4166 pmsg->prefix_type = pinfo->type;
4167 pmsg->prefix_pad3 = 0;
4168 pmsg->prefix_flags = 0;
4170 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4171 if (pinfo->autoconf)
4172 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4174 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
4176 ci.preferred_time = ntohl(pinfo->prefered);
4177 ci.valid_time = ntohl(pinfo->valid);
4178 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
4180 return nlmsg_end(skb, nlh);
4183 nlmsg_cancel(skb, nlh);
4187 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4188 struct prefix_info *pinfo)
4190 struct sk_buff *skb;
4191 struct net *net = dev_net(idev->dev);
4194 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4198 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4200 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4201 WARN_ON(err == -EMSGSIZE);
4205 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4209 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4212 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4214 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4219 * If the address was optimistic
4220 * we inserted the route at the start of
4221 * our DAD process, so we don't need
4224 if (!(ifp->rt->rt6i_node))
4225 ip6_ins_rt(ifp->rt);
4226 if (ifp->idev->cnf.forwarding)
4227 addrconf_join_anycast(ifp);
4230 if (ifp->idev->cnf.forwarding)
4231 addrconf_leave_anycast(ifp);
4232 addrconf_leave_solict(ifp->idev, &ifp->addr);
4233 dst_hold(&ifp->rt->dst);
4235 if (ip6_del_rt(ifp->rt))
4236 dst_free(&ifp->rt->dst);
4241 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4244 if (likely(ifp->idev->dead == 0))
4245 __ipv6_ifa_notify(event, ifp);
4246 rcu_read_unlock_bh();
4249 #ifdef CONFIG_SYSCTL
4252 int addrconf_sysctl_forward(ctl_table *ctl, int write,
4253 void __user *buffer, size_t *lenp, loff_t *ppos)
4255 int *valp = ctl->data;
4260 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4263 ret = addrconf_fixup_forwarding(ctl, valp, val);
4269 static void dev_disable_change(struct inet6_dev *idev)
4271 if (!idev || !idev->dev)
4274 if (idev->cnf.disable_ipv6)
4275 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4277 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4280 static void addrconf_disable_change(struct net *net, __s32 newf)
4282 struct net_device *dev;
4283 struct inet6_dev *idev;
4286 for_each_netdev_rcu(net, dev) {
4287 idev = __in6_dev_get(dev);
4289 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4290 idev->cnf.disable_ipv6 = newf;
4292 dev_disable_change(idev);
4298 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int old)
4302 net = (struct net *)table->extra2;
4304 if (p == &net->ipv6.devconf_dflt->disable_ipv6)
4307 if (!rtnl_trylock()) {
4308 /* Restore the original values before restarting */
4310 return restart_syscall();
4313 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4314 __s32 newf = net->ipv6.devconf_all->disable_ipv6;
4315 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4316 addrconf_disable_change(net, newf);
4317 } else if ((!*p) ^ (!old))
4318 dev_disable_change((struct inet6_dev *)table->extra1);
4325 int addrconf_sysctl_disable(ctl_table *ctl, int write,
4326 void __user *buffer, size_t *lenp, loff_t *ppos)
4328 int *valp = ctl->data;
4333 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4336 ret = addrconf_disable_ipv6(ctl, valp, val);
4342 static struct addrconf_sysctl_table
4344 struct ctl_table_header *sysctl_header;
4345 ctl_table addrconf_vars[DEVCONF_MAX+1];
4347 } addrconf_sysctl __read_mostly = {
4348 .sysctl_header = NULL,
4351 .procname = "forwarding",
4352 .data = &ipv6_devconf.forwarding,
4353 .maxlen = sizeof(int),
4355 .proc_handler = addrconf_sysctl_forward,
4358 .procname = "hop_limit",
4359 .data = &ipv6_devconf.hop_limit,
4360 .maxlen = sizeof(int),
4362 .proc_handler = proc_dointvec,
4366 .data = &ipv6_devconf.mtu6,
4367 .maxlen = sizeof(int),
4369 .proc_handler = proc_dointvec,
4372 .procname = "accept_ra",
4373 .data = &ipv6_devconf.accept_ra,
4374 .maxlen = sizeof(int),
4376 .proc_handler = proc_dointvec,
4379 .procname = "accept_redirects",
4380 .data = &ipv6_devconf.accept_redirects,
4381 .maxlen = sizeof(int),
4383 .proc_handler = proc_dointvec,
4386 .procname = "autoconf",
4387 .data = &ipv6_devconf.autoconf,
4388 .maxlen = sizeof(int),
4390 .proc_handler = proc_dointvec,
4393 .procname = "dad_transmits",
4394 .data = &ipv6_devconf.dad_transmits,
4395 .maxlen = sizeof(int),
4397 .proc_handler = proc_dointvec,
4400 .procname = "router_solicitations",
4401 .data = &ipv6_devconf.rtr_solicits,
4402 .maxlen = sizeof(int),
4404 .proc_handler = proc_dointvec,
4407 .procname = "router_solicitation_interval",
4408 .data = &ipv6_devconf.rtr_solicit_interval,
4409 .maxlen = sizeof(int),
4411 .proc_handler = proc_dointvec_jiffies,
4414 .procname = "router_solicitation_delay",
4415 .data = &ipv6_devconf.rtr_solicit_delay,
4416 .maxlen = sizeof(int),
4418 .proc_handler = proc_dointvec_jiffies,
4421 .procname = "force_mld_version",
4422 .data = &ipv6_devconf.force_mld_version,
4423 .maxlen = sizeof(int),
4425 .proc_handler = proc_dointvec,
4427 #ifdef CONFIG_IPV6_PRIVACY
4429 .procname = "use_tempaddr",
4430 .data = &ipv6_devconf.use_tempaddr,
4431 .maxlen = sizeof(int),
4433 .proc_handler = proc_dointvec,
4436 .procname = "temp_valid_lft",
4437 .data = &ipv6_devconf.temp_valid_lft,
4438 .maxlen = sizeof(int),
4440 .proc_handler = proc_dointvec,
4443 .procname = "temp_prefered_lft",
4444 .data = &ipv6_devconf.temp_prefered_lft,
4445 .maxlen = sizeof(int),
4447 .proc_handler = proc_dointvec,
4450 .procname = "regen_max_retry",
4451 .data = &ipv6_devconf.regen_max_retry,
4452 .maxlen = sizeof(int),
4454 .proc_handler = proc_dointvec,
4457 .procname = "max_desync_factor",
4458 .data = &ipv6_devconf.max_desync_factor,
4459 .maxlen = sizeof(int),
4461 .proc_handler = proc_dointvec,
4465 .procname = "max_addresses",
4466 .data = &ipv6_devconf.max_addresses,
4467 .maxlen = sizeof(int),
4469 .proc_handler = proc_dointvec,
4472 .procname = "accept_ra_defrtr",
4473 .data = &ipv6_devconf.accept_ra_defrtr,
4474 .maxlen = sizeof(int),
4476 .proc_handler = proc_dointvec,
4479 .procname = "accept_ra_pinfo",
4480 .data = &ipv6_devconf.accept_ra_pinfo,
4481 .maxlen = sizeof(int),
4483 .proc_handler = proc_dointvec,
4485 #ifdef CONFIG_IPV6_ROUTER_PREF
4487 .procname = "accept_ra_rtr_pref",
4488 .data = &ipv6_devconf.accept_ra_rtr_pref,
4489 .maxlen = sizeof(int),
4491 .proc_handler = proc_dointvec,
4494 .procname = "router_probe_interval",
4495 .data = &ipv6_devconf.rtr_probe_interval,
4496 .maxlen = sizeof(int),
4498 .proc_handler = proc_dointvec_jiffies,
4500 #ifdef CONFIG_IPV6_ROUTE_INFO
4502 .procname = "accept_ra_rt_info_max_plen",
4503 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4504 .maxlen = sizeof(int),
4506 .proc_handler = proc_dointvec,
4511 .procname = "proxy_ndp",
4512 .data = &ipv6_devconf.proxy_ndp,
4513 .maxlen = sizeof(int),
4515 .proc_handler = proc_dointvec,
4518 .procname = "accept_source_route",
4519 .data = &ipv6_devconf.accept_source_route,
4520 .maxlen = sizeof(int),
4522 .proc_handler = proc_dointvec,
4524 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4526 .procname = "optimistic_dad",
4527 .data = &ipv6_devconf.optimistic_dad,
4528 .maxlen = sizeof(int),
4530 .proc_handler = proc_dointvec,
4534 #ifdef CONFIG_IPV6_MROUTE
4536 .procname = "mc_forwarding",
4537 .data = &ipv6_devconf.mc_forwarding,
4538 .maxlen = sizeof(int),
4540 .proc_handler = proc_dointvec,
4544 .procname = "disable_ipv6",
4545 .data = &ipv6_devconf.disable_ipv6,
4546 .maxlen = sizeof(int),
4548 .proc_handler = addrconf_sysctl_disable,
4551 .procname = "accept_dad",
4552 .data = &ipv6_devconf.accept_dad,
4553 .maxlen = sizeof(int),
4555 .proc_handler = proc_dointvec,
4558 .procname = "force_tllao",
4559 .data = &ipv6_devconf.force_tllao,
4560 .maxlen = sizeof(int),
4562 .proc_handler = proc_dointvec
4570 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4571 struct inet6_dev *idev, struct ipv6_devconf *p)
4574 struct addrconf_sysctl_table *t;
4576 #define ADDRCONF_CTL_PATH_DEV 3
4578 struct ctl_path addrconf_ctl_path[] = {
4579 { .procname = "net", },
4580 { .procname = "ipv6", },
4581 { .procname = "conf", },
4582 { /* to be set */ },
4587 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4591 for (i = 0; t->addrconf_vars[i].data; i++) {
4592 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
4593 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4594 t->addrconf_vars[i].extra2 = net;
4598 * Make a copy of dev_name, because '.procname' is regarded as const
4599 * by sysctl and we wouldn't want anyone to change it under our feet
4600 * (see SIOCSIFNAME).
4602 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4606 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4608 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4610 if (t->sysctl_header == NULL)
4624 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4626 struct addrconf_sysctl_table *t;
4628 if (p->sysctl == NULL)
4633 unregister_net_sysctl_table(t->sysctl_header);
4638 static void addrconf_sysctl_register(struct inet6_dev *idev)
4640 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
4641 &ndisc_ifinfo_sysctl_change);
4642 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4646 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4648 __addrconf_sysctl_unregister(&idev->cnf);
4649 neigh_sysctl_unregister(idev->nd_parms);
4655 static int __net_init addrconf_init_net(struct net *net)
4658 struct ipv6_devconf *all, *dflt;
4661 all = &ipv6_devconf;
4662 dflt = &ipv6_devconf_dflt;
4664 if (!net_eq(net, &init_net)) {
4665 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4669 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4671 goto err_alloc_dflt;
4673 /* these will be inherited by all namespaces */
4674 dflt->autoconf = ipv6_defaults.autoconf;
4675 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
4678 net->ipv6.devconf_all = all;
4679 net->ipv6.devconf_dflt = dflt;
4681 #ifdef CONFIG_SYSCTL
4682 err = __addrconf_sysctl_register(net, "all", NULL, all);
4686 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
4692 #ifdef CONFIG_SYSCTL
4694 __addrconf_sysctl_unregister(all);
4704 static void __net_exit addrconf_exit_net(struct net *net)
4706 #ifdef CONFIG_SYSCTL
4707 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4708 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4710 if (!net_eq(net, &init_net)) {
4711 kfree(net->ipv6.devconf_dflt);
4712 kfree(net->ipv6.devconf_all);
4716 static struct pernet_operations addrconf_ops = {
4717 .init = addrconf_init_net,
4718 .exit = addrconf_exit_net,
4725 int register_inet6addr_notifier(struct notifier_block *nb)
4727 return atomic_notifier_chain_register(&inet6addr_chain, nb);
4729 EXPORT_SYMBOL(register_inet6addr_notifier);
4731 int unregister_inet6addr_notifier(struct notifier_block *nb)
4733 return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
4735 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4737 static struct rtnl_af_ops inet6_ops = {
4739 .fill_link_af = inet6_fill_link_af,
4740 .get_link_af_size = inet6_get_link_af_size,
4744 * Init / cleanup code
4747 int __init addrconf_init(void)
4751 err = ipv6_addr_label_init();
4753 printk(KERN_CRIT "IPv6 Addrconf:"
4754 " cannot initialize default policy table: %d.\n", err);
4758 err = register_pernet_subsys(&addrconf_ops);
4762 /* The addrconf netdev notifier requires that loopback_dev
4763 * has it's ipv6 private information allocated and setup
4764 * before it can bring up and give link-local addresses
4765 * to other devices which are up.
4767 * Unfortunately, loopback_dev is not necessarily the first
4768 * entry in the global dev_base list of net devices. In fact,
4769 * it is likely to be the very last entry on that list.
4770 * So this causes the notifier registry below to try and
4771 * give link-local addresses to all devices besides loopback_dev
4772 * first, then loopback_dev, which cases all the non-loopback_dev
4773 * devices to fail to get a link-local address.
4775 * So, as a temporary fix, allocate the ipv6 structure for
4776 * loopback_dev first by hand.
4777 * Longer term, all of the dependencies ipv6 has upon the loopback
4778 * device and it being up should be removed.
4781 if (!ipv6_add_dev(init_net.loopback_dev))
4787 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4788 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
4790 register_netdevice_notifier(&ipv6_dev_notf);
4794 err = rtnl_af_register(&inet6_ops);
4798 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
4803 /* Only the first call to __rtnl_register can fail */
4804 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
4805 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
4806 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
4807 inet6_dump_ifaddr, NULL);
4808 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
4809 inet6_dump_ifmcaddr, NULL);
4810 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
4811 inet6_dump_ifacaddr, NULL);
4813 ipv6_addr_label_rtnl_register();
4817 rtnl_af_unregister(&inet6_ops);
4819 unregister_netdevice_notifier(&ipv6_dev_notf);
4821 unregister_pernet_subsys(&addrconf_ops);
4823 ipv6_addr_label_cleanup();
4828 void addrconf_cleanup(void)
4830 struct net_device *dev;
4833 unregister_netdevice_notifier(&ipv6_dev_notf);
4834 unregister_pernet_subsys(&addrconf_ops);
4835 ipv6_addr_label_cleanup();
4839 __rtnl_af_unregister(&inet6_ops);
4841 /* clean dev list */
4842 for_each_netdev(&init_net, dev) {
4843 if (__in6_dev_get(dev) == NULL)
4845 addrconf_ifdown(dev, 1);
4847 addrconf_ifdown(init_net.loopback_dev, 2);
4852 spin_lock_bh(&addrconf_hash_lock);
4853 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4854 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
4855 spin_unlock_bh(&addrconf_hash_lock);
4857 del_timer(&addr_chk_timer);