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);
378 in6_dev_finish_destroy(ndev);
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_assign_pointer(dev->ip6_ptr, ndev);
433 /* Join all-node multicast group */
434 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
436 /* Join all-router multicast group if forwarding is set */
437 if (ndev->cnf.forwarding && dev && (dev->flags & IFF_MULTICAST))
438 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
443 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
445 struct inet6_dev *idev;
449 idev = __in6_dev_get(dev);
451 idev = ipv6_add_dev(dev);
456 if (dev->flags&IFF_UP)
462 static void dev_forward_change(struct inet6_dev *idev)
464 struct net_device *dev;
465 struct inet6_ifaddr *ifa;
470 if (idev->cnf.forwarding)
471 dev_disable_lro(dev);
472 if (dev && (dev->flags & IFF_MULTICAST)) {
473 if (idev->cnf.forwarding)
474 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
476 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
479 list_for_each_entry(ifa, &idev->addr_list, if_list) {
480 if (ifa->flags&IFA_F_TENTATIVE)
482 if (idev->cnf.forwarding)
483 addrconf_join_anycast(ifa);
485 addrconf_leave_anycast(ifa);
490 static void addrconf_forward_change(struct net *net, __s32 newf)
492 struct net_device *dev;
493 struct inet6_dev *idev;
495 for_each_netdev(net, dev) {
496 idev = __in6_dev_get(dev);
498 int changed = (!idev->cnf.forwarding) ^ (!newf);
499 idev->cnf.forwarding = newf;
501 dev_forward_change(idev);
506 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
510 net = (struct net *)table->extra2;
511 if (p == &net->ipv6.devconf_dflt->forwarding)
514 if (!rtnl_trylock()) {
515 /* Restore the original values before restarting */
517 return restart_syscall();
520 if (p == &net->ipv6.devconf_all->forwarding) {
521 __s32 newf = net->ipv6.devconf_all->forwarding;
522 net->ipv6.devconf_dflt->forwarding = newf;
523 addrconf_forward_change(net, newf);
524 } else if ((!*p) ^ (!old))
525 dev_forward_change((struct inet6_dev *)table->extra1);
529 rt6_purge_dflt_routers(net);
534 /* Nobody refers to this ifaddr, destroy it */
535 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
537 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
539 #ifdef NET_REFCNT_DEBUG
540 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
543 in6_dev_put(ifp->idev);
545 if (del_timer(&ifp->timer))
546 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
548 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
549 pr_warning("Freeing alive inet6 address %p\n", ifp);
552 dst_release(&ifp->rt->dst);
558 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
561 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
564 * Each device address list is sorted in order of scope -
565 * global before linklocal.
567 list_for_each(p, &idev->addr_list) {
568 struct inet6_ifaddr *ifa
569 = list_entry(p, struct inet6_ifaddr, if_list);
570 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
574 list_add_tail(&ifp->if_list, p);
577 static u32 ipv6_addr_hash(const struct in6_addr *addr)
580 * We perform the hash function over the last 64 bits of the address
581 * This will include the IEEE address token on links that support it.
583 return jhash_2words((__force u32)addr->s6_addr32[2],
584 (__force u32)addr->s6_addr32[3], 0)
585 & (IN6_ADDR_HSIZE - 1);
588 /* On success it returns ifp with increased reference count */
590 static struct inet6_ifaddr *
591 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
592 int scope, u32 flags)
594 struct inet6_ifaddr *ifa = NULL;
598 int addr_type = ipv6_addr_type(addr);
600 if (addr_type == IPV6_ADDR_ANY ||
601 addr_type & IPV6_ADDR_MULTICAST ||
602 (!(idev->dev->flags & IFF_LOOPBACK) &&
603 addr_type & IPV6_ADDR_LOOPBACK))
604 return ERR_PTR(-EADDRNOTAVAIL);
608 err = -ENODEV; /*XXX*/
612 if (idev->cnf.disable_ipv6) {
617 spin_lock(&addrconf_hash_lock);
619 /* Ignore adding duplicate addresses on an interface */
620 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
621 ADBG(("ipv6_add_addr: already assigned\n"));
626 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
629 ADBG(("ipv6_add_addr: malloc failed\n"));
634 rt = addrconf_dst_alloc(idev, addr, 0);
640 ipv6_addr_copy(&ifa->addr, addr);
642 spin_lock_init(&ifa->lock);
643 spin_lock_init(&ifa->state_lock);
644 init_timer(&ifa->timer);
645 INIT_HLIST_NODE(&ifa->addr_lst);
646 ifa->timer.data = (unsigned long) ifa;
648 ifa->prefix_len = pfxlen;
649 ifa->flags = flags | IFA_F_TENTATIVE;
650 ifa->cstamp = ifa->tstamp = jiffies;
655 * part one of RFC 4429, section 3.3
656 * We should not configure an address as
657 * optimistic if we do not yet know the link
658 * layer address of our nexhop router
661 if (dst_get_neighbour_raw(&rt->dst) == NULL)
662 ifa->flags &= ~IFA_F_OPTIMISTIC;
669 /* Add to big hash table */
670 hash = ipv6_addr_hash(addr);
672 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
673 spin_unlock(&addrconf_hash_lock);
675 write_lock(&idev->lock);
676 /* Add to inet6_dev unicast addr list. */
677 ipv6_link_dev_addr(idev, ifa);
679 #ifdef CONFIG_IPV6_PRIVACY
680 if (ifa->flags&IFA_F_TEMPORARY) {
681 list_add(&ifa->tmp_list, &idev->tempaddr_list);
687 write_unlock(&idev->lock);
689 rcu_read_unlock_bh();
691 if (likely(err == 0))
692 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
700 spin_unlock(&addrconf_hash_lock);
704 /* This function wants to get referenced ifp and releases it before return */
706 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
708 struct inet6_ifaddr *ifa, *ifn;
709 struct inet6_dev *idev = ifp->idev;
711 int deleted = 0, onlink = 0;
712 unsigned long expires = jiffies;
714 spin_lock_bh(&ifp->state_lock);
716 ifp->state = INET6_IFADDR_STATE_DEAD;
717 spin_unlock_bh(&ifp->state_lock);
719 if (state == INET6_IFADDR_STATE_DEAD)
722 spin_lock_bh(&addrconf_hash_lock);
723 hlist_del_init_rcu(&ifp->addr_lst);
724 spin_unlock_bh(&addrconf_hash_lock);
726 write_lock_bh(&idev->lock);
727 #ifdef CONFIG_IPV6_PRIVACY
728 if (ifp->flags&IFA_F_TEMPORARY) {
729 list_del(&ifp->tmp_list);
731 in6_ifa_put(ifp->ifpub);
738 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
740 list_del_init(&ifp->if_list);
743 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
747 } else if (ifp->flags & IFA_F_PERMANENT) {
748 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
750 if (ifa->flags & IFA_F_PERMANENT) {
755 unsigned long lifetime;
760 spin_lock(&ifa->lock);
762 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
764 * Note: Because this address is
765 * not permanent, lifetime <
766 * LONG_MAX / HZ here.
768 if (time_before(expires,
769 ifa->tstamp + lifetime * HZ))
770 expires = ifa->tstamp + lifetime * HZ;
771 spin_unlock(&ifa->lock);
776 write_unlock_bh(&idev->lock);
778 addrconf_del_timer(ifp);
780 ipv6_ifa_notify(RTM_DELADDR, ifp);
782 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
785 * Purge or update corresponding prefix
787 * 1) we don't purge prefix here if address was not permanent.
788 * prefix is managed by its own lifetime.
789 * 2) if there're no addresses, delete prefix.
790 * 3) if there're still other permanent address(es),
791 * corresponding prefix is still permanent.
792 * 4) otherwise, update prefix lifetime to the
793 * longest valid lifetime among the corresponding
794 * addresses on the device.
795 * Note: subsequent RA will update lifetime.
799 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
800 struct in6_addr prefix;
802 struct net *net = dev_net(ifp->idev->dev);
803 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
804 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
806 if (rt && addrconf_is_prefix_route(rt)) {
810 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
811 rt->rt6i_expires = expires;
812 rt->rt6i_flags |= RTF_EXPIRES;
815 dst_release(&rt->dst);
818 /* clean up prefsrc entries */
819 rt6_remove_prefsrc(ifp);
824 #ifdef CONFIG_IPV6_PRIVACY
825 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
827 struct inet6_dev *idev = ifp->idev;
828 struct in6_addr addr, *tmpaddr;
829 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp, age;
830 unsigned long regen_advance;
836 write_lock(&idev->lock);
838 spin_lock_bh(&ift->lock);
839 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
840 spin_unlock_bh(&ift->lock);
847 if (idev->cnf.use_tempaddr <= 0) {
848 write_unlock(&idev->lock);
850 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
855 spin_lock_bh(&ifp->lock);
856 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
857 idev->cnf.use_tempaddr = -1; /*XXX*/
858 spin_unlock_bh(&ifp->lock);
859 write_unlock(&idev->lock);
861 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
867 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
868 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
869 spin_unlock_bh(&ifp->lock);
870 write_unlock(&idev->lock);
872 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
878 memcpy(&addr.s6_addr[8], idev->rndid, 8);
879 age = (jiffies - ifp->tstamp) / HZ;
880 tmp_valid_lft = min_t(__u32,
882 idev->cnf.temp_valid_lft + age);
883 tmp_prefered_lft = min_t(__u32,
885 idev->cnf.temp_prefered_lft + age -
886 idev->cnf.max_desync_factor);
887 tmp_plen = ifp->prefix_len;
888 max_addresses = idev->cnf.max_addresses;
889 tmp_cstamp = ifp->cstamp;
890 tmp_tstamp = ifp->tstamp;
891 spin_unlock_bh(&ifp->lock);
893 regen_advance = idev->cnf.regen_max_retry *
894 idev->cnf.dad_transmits *
895 idev->nd_parms->retrans_time / HZ;
896 write_unlock(&idev->lock);
898 /* A temporary address is created only if this calculated Preferred
899 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
900 * an implementation must not create a temporary address with a zero
901 * Preferred Lifetime.
903 if (tmp_prefered_lft <= regen_advance) {
910 addr_flags = IFA_F_TEMPORARY;
911 /* set in addrconf_prefix_rcv() */
912 if (ifp->flags & IFA_F_OPTIMISTIC)
913 addr_flags |= IFA_F_OPTIMISTIC;
915 ift = !max_addresses ||
916 ipv6_count_addresses(idev) < max_addresses ?
917 ipv6_add_addr(idev, &addr, tmp_plen,
918 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
920 if (!ift || IS_ERR(ift)) {
924 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
926 write_lock(&idev->lock);
930 spin_lock_bh(&ift->lock);
932 ift->valid_lft = tmp_valid_lft;
933 ift->prefered_lft = tmp_prefered_lft;
934 ift->cstamp = tmp_cstamp;
935 ift->tstamp = tmp_tstamp;
936 spin_unlock_bh(&ift->lock);
938 addrconf_dad_start(ift, 0);
947 * Choose an appropriate source address (RFC3484)
950 IPV6_SADDR_RULE_INIT = 0,
951 IPV6_SADDR_RULE_LOCAL,
952 IPV6_SADDR_RULE_SCOPE,
953 IPV6_SADDR_RULE_PREFERRED,
954 #ifdef CONFIG_IPV6_MIP6
958 IPV6_SADDR_RULE_LABEL,
959 #ifdef CONFIG_IPV6_PRIVACY
960 IPV6_SADDR_RULE_PRIVACY,
962 IPV6_SADDR_RULE_ORCHID,
963 IPV6_SADDR_RULE_PREFIX,
967 struct ipv6_saddr_score {
970 struct inet6_ifaddr *ifa;
971 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
976 struct ipv6_saddr_dst {
977 const struct in6_addr *addr;
984 static inline int ipv6_saddr_preferred(int type)
986 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
991 static int ipv6_get_saddr_eval(struct net *net,
992 struct ipv6_saddr_score *score,
993 struct ipv6_saddr_dst *dst,
998 if (i <= score->rule) {
1000 case IPV6_SADDR_RULE_SCOPE:
1001 ret = score->scopedist;
1003 case IPV6_SADDR_RULE_PREFIX:
1004 ret = score->matchlen;
1007 ret = !!test_bit(i, score->scorebits);
1013 case IPV6_SADDR_RULE_INIT:
1014 /* Rule 0: remember if hiscore is not ready yet */
1017 case IPV6_SADDR_RULE_LOCAL:
1018 /* Rule 1: Prefer same address */
1019 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1021 case IPV6_SADDR_RULE_SCOPE:
1022 /* Rule 2: Prefer appropriate scope
1027 * ---+--+-+---> scope
1029 * | d is scope of the destination.
1031 * | \ <- smaller scope is better if
1032 * B-15 | \ if scope is enough for destinaion.
1033 * | ret = B - scope (-1 <= scope >= d <= 15).
1035 * |/ <- greater is better
1036 * -C / if scope is not enough for destination.
1037 * /| ret = scope - C (-1 <= d < scope <= 15).
1039 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1040 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1041 * Assume B = 0 and we get C > 29.
1043 ret = __ipv6_addr_src_scope(score->addr_type);
1044 if (ret >= dst->scope)
1047 ret -= 128; /* 30 is enough */
1048 score->scopedist = ret;
1050 case IPV6_SADDR_RULE_PREFERRED:
1051 /* Rule 3: Avoid deprecated and optimistic addresses */
1052 ret = ipv6_saddr_preferred(score->addr_type) ||
1053 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1055 #ifdef CONFIG_IPV6_MIP6
1056 case IPV6_SADDR_RULE_HOA:
1058 /* Rule 4: Prefer home address */
1059 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1060 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1064 case IPV6_SADDR_RULE_OIF:
1065 /* Rule 5: Prefer outgoing interface */
1066 ret = (!dst->ifindex ||
1067 dst->ifindex == score->ifa->idev->dev->ifindex);
1069 case IPV6_SADDR_RULE_LABEL:
1070 /* Rule 6: Prefer matching label */
1071 ret = ipv6_addr_label(net,
1072 &score->ifa->addr, score->addr_type,
1073 score->ifa->idev->dev->ifindex) == dst->label;
1075 #ifdef CONFIG_IPV6_PRIVACY
1076 case IPV6_SADDR_RULE_PRIVACY:
1078 /* Rule 7: Prefer public address
1079 * Note: prefer temporary address if use_tempaddr >= 2
1081 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1082 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1083 score->ifa->idev->cnf.use_tempaddr >= 2;
1084 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1088 case IPV6_SADDR_RULE_ORCHID:
1089 /* Rule 8-: Prefer ORCHID vs ORCHID or
1090 * non-ORCHID vs non-ORCHID
1092 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1093 ipv6_addr_orchid(dst->addr));
1095 case IPV6_SADDR_RULE_PREFIX:
1096 /* Rule 8: Use longest matching prefix */
1097 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1105 __set_bit(i, score->scorebits);
1111 int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
1112 const struct in6_addr *daddr, unsigned int prefs,
1113 struct in6_addr *saddr)
1115 struct ipv6_saddr_score scores[2],
1116 *score = &scores[0], *hiscore = &scores[1];
1117 struct ipv6_saddr_dst dst;
1118 struct net_device *dev;
1121 dst_type = __ipv6_addr_type(daddr);
1123 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1124 dst.scope = __ipv6_addr_src_scope(dst_type);
1125 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1129 hiscore->ifa = NULL;
1133 for_each_netdev_rcu(net, dev) {
1134 struct inet6_dev *idev;
1136 /* Candidate Source Address (section 4)
1137 * - multicast and link-local destination address,
1138 * the set of candidate source address MUST only
1139 * include addresses assigned to interfaces
1140 * belonging to the same link as the outgoing
1142 * (- For site-local destination addresses, the
1143 * set of candidate source addresses MUST only
1144 * include addresses assigned to interfaces
1145 * belonging to the same site as the outgoing
1148 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1149 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1150 dst.ifindex && dev->ifindex != dst.ifindex)
1153 idev = __in6_dev_get(dev);
1157 read_lock_bh(&idev->lock);
1158 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1162 * - Tentative Address (RFC2462 section 5.4)
1163 * - A tentative address is not considered
1164 * "assigned to an interface" in the traditional
1165 * sense, unless it is also flagged as optimistic.
1166 * - Candidate Source Address (section 4)
1167 * - In any case, anycast addresses, multicast
1168 * addresses, and the unspecified address MUST
1169 * NOT be included in a candidate set.
1171 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1172 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1175 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1177 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1178 score->addr_type & IPV6_ADDR_MULTICAST)) {
1179 LIMIT_NETDEBUG(KERN_DEBUG
1180 "ADDRCONF: unspecified / multicast address "
1181 "assigned as unicast address on %s",
1187 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1189 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1190 int minihiscore, miniscore;
1192 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1193 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1195 if (minihiscore > miniscore) {
1196 if (i == IPV6_SADDR_RULE_SCOPE &&
1197 score->scopedist > 0) {
1200 * each remaining entry
1201 * has too small (not enough)
1202 * scope, because ifa entries
1203 * are sorted by their scope
1209 } else if (minihiscore < miniscore) {
1211 in6_ifa_put(hiscore->ifa);
1213 in6_ifa_hold(score->ifa);
1215 swap(hiscore, score);
1217 /* restore our iterator */
1218 score->ifa = hiscore->ifa;
1225 read_unlock_bh(&idev->lock);
1230 return -EADDRNOTAVAIL;
1232 ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1233 in6_ifa_put(hiscore->ifa);
1236 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1238 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1239 unsigned char banned_flags)
1241 struct inet6_dev *idev;
1242 int err = -EADDRNOTAVAIL;
1245 idev = __in6_dev_get(dev);
1247 struct inet6_ifaddr *ifp;
1249 read_lock_bh(&idev->lock);
1250 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1251 if (ifp->scope == IFA_LINK &&
1252 !(ifp->flags & banned_flags)) {
1253 ipv6_addr_copy(addr, &ifp->addr);
1258 read_unlock_bh(&idev->lock);
1264 static int ipv6_count_addresses(struct inet6_dev *idev)
1267 struct inet6_ifaddr *ifp;
1269 read_lock_bh(&idev->lock);
1270 list_for_each_entry(ifp, &idev->addr_list, if_list)
1272 read_unlock_bh(&idev->lock);
1276 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1277 struct net_device *dev, int strict)
1279 struct inet6_ifaddr *ifp;
1280 struct hlist_node *node;
1281 unsigned int hash = ipv6_addr_hash(addr);
1284 hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1285 if (!net_eq(dev_net(ifp->idev->dev), net))
1287 if (ipv6_addr_equal(&ifp->addr, addr) &&
1288 !(ifp->flags&IFA_F_TENTATIVE) &&
1289 (dev == NULL || ifp->idev->dev == dev ||
1290 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1291 rcu_read_unlock_bh();
1296 rcu_read_unlock_bh();
1299 EXPORT_SYMBOL(ipv6_chk_addr);
1301 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1302 struct net_device *dev)
1304 unsigned int hash = ipv6_addr_hash(addr);
1305 struct inet6_ifaddr *ifp;
1306 struct hlist_node *node;
1308 hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1309 if (!net_eq(dev_net(ifp->idev->dev), net))
1311 if (ipv6_addr_equal(&ifp->addr, addr)) {
1312 if (dev == NULL || ifp->idev->dev == dev)
1319 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1321 struct inet6_dev *idev;
1322 struct inet6_ifaddr *ifa;
1327 idev = __in6_dev_get(dev);
1329 read_lock_bh(&idev->lock);
1330 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1331 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1336 read_unlock_bh(&idev->lock);
1342 EXPORT_SYMBOL(ipv6_chk_prefix);
1344 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1345 struct net_device *dev, int strict)
1347 struct inet6_ifaddr *ifp, *result = NULL;
1348 unsigned int hash = ipv6_addr_hash(addr);
1349 struct hlist_node *node;
1352 hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1353 if (!net_eq(dev_net(ifp->idev->dev), net))
1355 if (ipv6_addr_equal(&ifp->addr, addr)) {
1356 if (dev == NULL || ifp->idev->dev == dev ||
1357 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1364 rcu_read_unlock_bh();
1369 /* Gets referenced address, destroys ifaddr */
1371 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1373 if (ifp->flags&IFA_F_PERMANENT) {
1374 spin_lock_bh(&ifp->lock);
1375 addrconf_del_timer(ifp);
1376 ifp->flags |= IFA_F_TENTATIVE;
1378 ifp->flags |= IFA_F_DADFAILED;
1379 spin_unlock_bh(&ifp->lock);
1381 ipv6_ifa_notify(0, ifp);
1383 #ifdef CONFIG_IPV6_PRIVACY
1384 } else if (ifp->flags&IFA_F_TEMPORARY) {
1385 struct inet6_ifaddr *ifpub;
1386 spin_lock_bh(&ifp->lock);
1389 in6_ifa_hold(ifpub);
1390 spin_unlock_bh(&ifp->lock);
1391 ipv6_create_tempaddr(ifpub, ifp);
1394 spin_unlock_bh(&ifp->lock);
1402 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1406 spin_lock(&ifp->state_lock);
1407 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1408 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1411 spin_unlock(&ifp->state_lock);
1416 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1418 struct inet6_dev *idev = ifp->idev;
1420 if (addrconf_dad_end(ifp)) {
1425 if (net_ratelimit())
1426 printk(KERN_INFO "%s: IPv6 duplicate address %pI6c detected!\n",
1427 ifp->idev->dev->name, &ifp->addr);
1429 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1430 struct in6_addr addr;
1432 addr.s6_addr32[0] = htonl(0xfe800000);
1433 addr.s6_addr32[1] = 0;
1435 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1436 ipv6_addr_equal(&ifp->addr, &addr)) {
1437 /* DAD failed for link-local based on MAC address */
1438 idev->cnf.disable_ipv6 = 1;
1440 printk(KERN_INFO "%s: IPv6 being disabled!\n",
1441 ifp->idev->dev->name);
1445 addrconf_dad_stop(ifp, 1);
1448 /* Join to solicited addr multicast group. */
1450 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1452 struct in6_addr maddr;
1454 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1457 addrconf_addr_solict_mult(addr, &maddr);
1458 ipv6_dev_mc_inc(dev, &maddr);
1461 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1463 struct in6_addr maddr;
1465 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1468 addrconf_addr_solict_mult(addr, &maddr);
1469 __ipv6_dev_mc_dec(idev, &maddr);
1472 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1474 struct in6_addr addr;
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 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1485 if (ipv6_addr_any(&addr))
1487 __ipv6_dev_ac_dec(ifp->idev, &addr);
1490 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1492 if (dev->addr_len != ETH_ALEN)
1494 memcpy(eui, dev->dev_addr, 3);
1495 memcpy(eui + 5, dev->dev_addr + 3, 3);
1498 * The zSeries OSA network cards can be shared among various
1499 * OS instances, but the OSA cards have only one MAC address.
1500 * This leads to duplicate address conflicts in conjunction
1501 * with IPv6 if more than one instance uses the same card.
1503 * The driver for these cards can deliver a unique 16-bit
1504 * identifier for each instance sharing the same card. It is
1505 * placed instead of 0xFFFE in the interface identifier. The
1506 * "u" bit of the interface identifier is not inverted in this
1507 * case. Hence the resulting interface identifier has local
1508 * scope according to RFC2373.
1511 eui[3] = (dev->dev_id >> 8) & 0xFF;
1512 eui[4] = dev->dev_id & 0xFF;
1521 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1523 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1524 if (dev->addr_len != ARCNET_ALEN)
1527 eui[7] = *(u8*)dev->dev_addr;
1531 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1533 if (dev->addr_len != INFINIBAND_ALEN)
1535 memcpy(eui, dev->dev_addr + 12, 8);
1540 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1544 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1545 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1546 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1547 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1548 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1549 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1553 memcpy(eui + 4, &addr, 4);
1557 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1559 if (dev->priv_flags & IFF_ISATAP)
1560 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1564 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1566 switch (dev->type) {
1569 case ARPHRD_IEEE802_TR:
1570 return addrconf_ifid_eui48(eui, dev);
1572 return addrconf_ifid_arcnet(eui, dev);
1573 case ARPHRD_INFINIBAND:
1574 return addrconf_ifid_infiniband(eui, dev);
1576 return addrconf_ifid_sit(eui, dev);
1581 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1584 struct inet6_ifaddr *ifp;
1586 read_lock_bh(&idev->lock);
1587 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1588 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1589 memcpy(eui, ifp->addr.s6_addr+8, 8);
1594 read_unlock_bh(&idev->lock);
1598 #ifdef CONFIG_IPV6_PRIVACY
1599 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1600 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1603 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1604 idev->rndid[0] &= ~0x02;
1607 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1608 * check if generated address is not inappropriate
1610 * - Reserved subnet anycast (RFC 2526)
1611 * 11111101 11....11 1xxxxxxx
1612 * - ISATAP (RFC4214) 6.1
1613 * 00-00-5E-FE-xx-xx-xx-xx
1615 * - XXX: already assigned to an address on the device
1617 if (idev->rndid[0] == 0xfd &&
1618 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1619 (idev->rndid[7]&0x80))
1621 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1622 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1624 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1631 static void ipv6_regen_rndid(unsigned long data)
1633 struct inet6_dev *idev = (struct inet6_dev *) data;
1634 unsigned long expires;
1637 write_lock_bh(&idev->lock);
1642 if (__ipv6_regen_rndid(idev) < 0)
1646 idev->cnf.temp_prefered_lft * HZ -
1647 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1648 idev->cnf.max_desync_factor * HZ;
1649 if (time_before(expires, jiffies)) {
1651 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1656 if (!mod_timer(&idev->regen_timer, expires))
1660 write_unlock_bh(&idev->lock);
1661 rcu_read_unlock_bh();
1665 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1668 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1669 ret = __ipv6_regen_rndid(idev);
1679 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1680 unsigned long expires, u32 flags)
1682 struct fib6_config cfg = {
1683 .fc_table = RT6_TABLE_PREFIX,
1684 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1685 .fc_ifindex = dev->ifindex,
1686 .fc_expires = expires,
1688 .fc_flags = RTF_UP | flags,
1689 .fc_nlinfo.nl_net = dev_net(dev),
1690 .fc_protocol = RTPROT_KERNEL,
1693 ipv6_addr_copy(&cfg.fc_dst, pfx);
1695 /* Prevent useless cloning on PtP SIT.
1696 This thing is done here expecting that the whole
1697 class of non-broadcast devices need not cloning.
1699 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1700 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1701 cfg.fc_flags |= RTF_NONEXTHOP;
1704 ip6_route_add(&cfg);
1707 /* Create "default" multicast route to the interface */
1709 static void addrconf_add_mroute(struct net_device *dev)
1711 struct fib6_config cfg = {
1712 .fc_table = RT6_TABLE_LOCAL,
1713 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1714 .fc_ifindex = dev->ifindex,
1717 .fc_nlinfo.nl_net = dev_net(dev),
1720 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1722 ip6_route_add(&cfg);
1725 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1726 static void sit_route_add(struct net_device *dev)
1728 struct fib6_config cfg = {
1729 .fc_table = RT6_TABLE_MAIN,
1730 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1731 .fc_ifindex = dev->ifindex,
1733 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1734 .fc_nlinfo.nl_net = dev_net(dev),
1737 /* prefix length - 96 bits "::d.d.d.d" */
1738 ip6_route_add(&cfg);
1742 static void addrconf_add_lroute(struct net_device *dev)
1744 struct in6_addr addr;
1746 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1747 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1750 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1752 struct inet6_dev *idev;
1756 idev = ipv6_find_idev(dev);
1758 return ERR_PTR(-ENOBUFS);
1760 if (idev->cnf.disable_ipv6)
1761 return ERR_PTR(-EACCES);
1763 /* Add default multicast route */
1764 addrconf_add_mroute(dev);
1766 /* Add link local route */
1767 addrconf_add_lroute(dev);
1771 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1773 struct prefix_info *pinfo;
1777 struct inet6_dev *in6_dev;
1778 struct net *net = dev_net(dev);
1780 pinfo = (struct prefix_info *) opt;
1782 if (len < sizeof(struct prefix_info)) {
1783 ADBG(("addrconf: prefix option too short\n"));
1788 * Validation checks ([ADDRCONF], page 19)
1791 addr_type = ipv6_addr_type(&pinfo->prefix);
1793 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1796 valid_lft = ntohl(pinfo->valid);
1797 prefered_lft = ntohl(pinfo->prefered);
1799 if (prefered_lft > valid_lft) {
1800 if (net_ratelimit())
1801 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1805 in6_dev = in6_dev_get(dev);
1807 if (in6_dev == NULL) {
1808 if (net_ratelimit())
1809 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1814 * Two things going on here:
1815 * 1) Add routes for on-link prefixes
1816 * 2) Configure prefixes with the auto flag set
1819 if (pinfo->onlink) {
1820 struct rt6_info *rt;
1821 unsigned long rt_expires;
1823 /* Avoid arithmetic overflow. Really, we could
1824 * save rt_expires in seconds, likely valid_lft,
1825 * but it would require division in fib gc, that it
1829 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1831 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
1833 if (addrconf_finite_timeout(rt_expires))
1836 rt = rt6_lookup(net, &pinfo->prefix, NULL,
1839 if (rt && addrconf_is_prefix_route(rt)) {
1840 /* Autoconf prefix route */
1841 if (valid_lft == 0) {
1844 } else if (addrconf_finite_timeout(rt_expires)) {
1846 rt->rt6i_expires = jiffies + rt_expires;
1847 rt->rt6i_flags |= RTF_EXPIRES;
1849 rt->rt6i_flags &= ~RTF_EXPIRES;
1850 rt->rt6i_expires = 0;
1852 } else if (valid_lft) {
1853 clock_t expires = 0;
1854 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1855 if (addrconf_finite_timeout(rt_expires)) {
1857 flags |= RTF_EXPIRES;
1858 expires = jiffies_to_clock_t(rt_expires);
1860 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1861 dev, expires, flags);
1864 dst_release(&rt->dst);
1867 /* Try to figure out our local address for this prefix */
1869 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1870 struct inet6_ifaddr * ifp;
1871 struct in6_addr addr;
1872 int create = 0, update_lft = 0;
1874 if (pinfo->prefix_len == 64) {
1875 memcpy(&addr, &pinfo->prefix, 8);
1876 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1877 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1878 in6_dev_put(in6_dev);
1883 if (net_ratelimit())
1884 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1886 in6_dev_put(in6_dev);
1891 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1893 if (ifp == NULL && valid_lft) {
1894 int max_addresses = in6_dev->cnf.max_addresses;
1897 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1898 if (in6_dev->cnf.optimistic_dad &&
1899 !net->ipv6.devconf_all->forwarding)
1900 addr_flags = IFA_F_OPTIMISTIC;
1903 /* Do not allow to create too much of autoconfigured
1904 * addresses; this would be too easy way to crash kernel.
1906 if (!max_addresses ||
1907 ipv6_count_addresses(in6_dev) < max_addresses)
1908 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1909 addr_type&IPV6_ADDR_SCOPE_MASK,
1912 if (!ifp || IS_ERR(ifp)) {
1913 in6_dev_put(in6_dev);
1917 update_lft = create = 1;
1918 ifp->cstamp = jiffies;
1919 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1925 #ifdef CONFIG_IPV6_PRIVACY
1926 struct inet6_ifaddr *ift;
1930 /* update lifetime (RFC2462 5.5.3 e) */
1931 spin_lock(&ifp->lock);
1933 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1934 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1937 if (!update_lft && stored_lft) {
1938 if (valid_lft > MIN_VALID_LIFETIME ||
1939 valid_lft > stored_lft)
1941 else if (stored_lft <= MIN_VALID_LIFETIME) {
1942 /* valid_lft <= stored_lft is always true */
1944 * RFC 4862 Section 5.5.3e:
1945 * "Note that the preferred lifetime of
1946 * the corresponding address is always
1947 * reset to the Preferred Lifetime in
1948 * the received Prefix Information
1949 * option, regardless of whether the
1950 * valid lifetime is also reset or
1953 * So if the preferred lifetime in
1954 * this advertisement is different
1955 * than what we have stored, but the
1956 * valid lifetime is invalid, just
1957 * reset prefered_lft.
1959 * We must set the valid lifetime
1960 * to the stored lifetime since we'll
1961 * be updating the timestamp below,
1962 * else we'll set it back to the
1965 if (prefered_lft != ifp->prefered_lft) {
1966 valid_lft = stored_lft;
1970 valid_lft = MIN_VALID_LIFETIME;
1971 if (valid_lft < prefered_lft)
1972 prefered_lft = valid_lft;
1978 ifp->valid_lft = valid_lft;
1979 ifp->prefered_lft = prefered_lft;
1982 ifp->flags &= ~IFA_F_DEPRECATED;
1983 spin_unlock(&ifp->lock);
1985 if (!(flags&IFA_F_TENTATIVE))
1986 ipv6_ifa_notify(0, ifp);
1988 spin_unlock(&ifp->lock);
1990 #ifdef CONFIG_IPV6_PRIVACY
1991 read_lock_bh(&in6_dev->lock);
1992 /* update all temporary addresses in the list */
1993 list_for_each_entry(ift, &in6_dev->tempaddr_list, tmp_list) {
1995 * When adjusting the lifetimes of an existing
1996 * temporary address, only lower the lifetimes.
1997 * Implementations must not increase the
1998 * lifetimes of an existing temporary address
1999 * when processing a Prefix Information Option.
2001 if (ifp != ift->ifpub)
2004 spin_lock(&ift->lock);
2006 if (ift->valid_lft > valid_lft &&
2007 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
2008 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
2009 if (ift->prefered_lft > prefered_lft &&
2010 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
2011 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
2012 spin_unlock(&ift->lock);
2013 if (!(flags&IFA_F_TENTATIVE))
2014 ipv6_ifa_notify(0, ift);
2017 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
2019 * When a new public address is created as described in [ADDRCONF],
2020 * also create a new temporary address. Also create a temporary
2021 * address if it's enabled but no temporary address currently exists.
2023 read_unlock_bh(&in6_dev->lock);
2024 ipv6_create_tempaddr(ifp, NULL);
2026 read_unlock_bh(&in6_dev->lock);
2033 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2034 in6_dev_put(in6_dev);
2038 * Set destination address.
2039 * Special case for SIT interfaces where we create a new "virtual"
2042 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2044 struct in6_ifreq ireq;
2045 struct net_device *dev;
2051 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2054 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2060 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2061 if (dev->type == ARPHRD_SIT) {
2062 const struct net_device_ops *ops = dev->netdev_ops;
2064 struct ip_tunnel_parm p;
2066 err = -EADDRNOTAVAIL;
2067 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2070 memset(&p, 0, sizeof(p));
2071 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2075 p.iph.protocol = IPPROTO_IPV6;
2077 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2079 if (ops->ndo_do_ioctl) {
2080 mm_segment_t oldfs = get_fs();
2083 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2090 dev = __dev_get_by_name(net, p.name);
2093 err = dev_open(dev);
2104 * Manual configuration of address on an interface
2106 static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx,
2107 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2110 struct inet6_ifaddr *ifp;
2111 struct inet6_dev *idev;
2112 struct net_device *dev;
2116 unsigned long timeout;
2123 /* check the lifetime */
2124 if (!valid_lft || prefered_lft > valid_lft)
2127 dev = __dev_get_by_index(net, ifindex);
2131 idev = addrconf_add_dev(dev);
2133 return PTR_ERR(idev);
2135 scope = ipv6_addr_scope(pfx);
2137 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2138 if (addrconf_finite_timeout(timeout)) {
2139 expires = jiffies_to_clock_t(timeout * HZ);
2140 valid_lft = timeout;
2141 flags = RTF_EXPIRES;
2145 ifa_flags |= IFA_F_PERMANENT;
2148 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2149 if (addrconf_finite_timeout(timeout)) {
2151 ifa_flags |= IFA_F_DEPRECATED;
2152 prefered_lft = timeout;
2155 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2158 spin_lock_bh(&ifp->lock);
2159 ifp->valid_lft = valid_lft;
2160 ifp->prefered_lft = prefered_lft;
2161 ifp->tstamp = jiffies;
2162 spin_unlock_bh(&ifp->lock);
2164 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2167 * Note that section 3.1 of RFC 4429 indicates
2168 * that the Optimistic flag should not be set for
2169 * manually configured addresses
2171 addrconf_dad_start(ifp, 0);
2177 return PTR_ERR(ifp);
2180 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
2183 struct inet6_ifaddr *ifp;
2184 struct inet6_dev *idev;
2185 struct net_device *dev;
2190 dev = __dev_get_by_index(net, ifindex);
2194 if ((idev = __in6_dev_get(dev)) == NULL)
2197 read_lock_bh(&idev->lock);
2198 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2199 if (ifp->prefix_len == plen &&
2200 ipv6_addr_equal(pfx, &ifp->addr)) {
2202 read_unlock_bh(&idev->lock);
2206 /* If the last address is deleted administratively,
2207 disable IPv6 on this interface.
2209 if (list_empty(&idev->addr_list))
2210 addrconf_ifdown(idev->dev, 1);
2214 read_unlock_bh(&idev->lock);
2215 return -EADDRNOTAVAIL;
2219 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2221 struct in6_ifreq ireq;
2224 if (!capable(CAP_NET_ADMIN))
2227 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2231 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2232 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2233 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2238 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2240 struct in6_ifreq ireq;
2243 if (!capable(CAP_NET_ADMIN))
2246 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2250 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2251 ireq.ifr6_prefixlen);
2256 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2257 int plen, int scope)
2259 struct inet6_ifaddr *ifp;
2261 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2263 spin_lock_bh(&ifp->lock);
2264 ifp->flags &= ~IFA_F_TENTATIVE;
2265 spin_unlock_bh(&ifp->lock);
2266 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2271 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2272 static void sit_add_v4_addrs(struct inet6_dev *idev)
2274 struct in6_addr addr;
2275 struct net_device *dev;
2276 struct net *net = dev_net(idev->dev);
2281 memset(&addr, 0, sizeof(struct in6_addr));
2282 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2284 if (idev->dev->flags&IFF_POINTOPOINT) {
2285 addr.s6_addr32[0] = htonl(0xfe800000);
2288 scope = IPV6_ADDR_COMPATv4;
2291 if (addr.s6_addr32[3]) {
2292 add_addr(idev, &addr, 128, scope);
2296 for_each_netdev(net, dev) {
2297 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2298 if (in_dev && (dev->flags & IFF_UP)) {
2299 struct in_ifaddr * ifa;
2303 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2306 addr.s6_addr32[3] = ifa->ifa_local;
2308 if (ifa->ifa_scope == RT_SCOPE_LINK)
2310 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2311 if (idev->dev->flags&IFF_POINTOPOINT)
2315 if (idev->dev->flags&IFF_POINTOPOINT)
2320 add_addr(idev, &addr, plen, flag);
2327 static void init_loopback(struct net_device *dev)
2329 struct inet6_dev *idev;
2335 if ((idev = ipv6_find_idev(dev)) == NULL) {
2336 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2340 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2343 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
2345 struct inet6_ifaddr * ifp;
2346 u32 addr_flags = IFA_F_PERMANENT;
2348 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2349 if (idev->cnf.optimistic_dad &&
2350 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2351 addr_flags |= IFA_F_OPTIMISTIC;
2355 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2357 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2358 addrconf_dad_start(ifp, 0);
2363 static void addrconf_dev_config(struct net_device *dev)
2365 struct in6_addr addr;
2366 struct inet6_dev * idev;
2370 if ((dev->type != ARPHRD_ETHER) &&
2371 (dev->type != ARPHRD_FDDI) &&
2372 (dev->type != ARPHRD_IEEE802_TR) &&
2373 (dev->type != ARPHRD_ARCNET) &&
2374 (dev->type != ARPHRD_INFINIBAND)) {
2375 /* Alas, we support only Ethernet autoconfiguration. */
2379 idev = addrconf_add_dev(dev);
2383 memset(&addr, 0, sizeof(struct in6_addr));
2384 addr.s6_addr32[0] = htonl(0xFE800000);
2386 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2387 addrconf_add_linklocal(idev, &addr);
2390 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2391 static void addrconf_sit_config(struct net_device *dev)
2393 struct inet6_dev *idev;
2398 * Configure the tunnel with one of our IPv4
2399 * addresses... we should configure all of
2400 * our v4 addrs in the tunnel
2403 if ((idev = ipv6_find_idev(dev)) == NULL) {
2404 printk(KERN_DEBUG "init sit: add_dev failed\n");
2408 if (dev->priv_flags & IFF_ISATAP) {
2409 struct in6_addr addr;
2411 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2412 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2413 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2414 addrconf_add_linklocal(idev, &addr);
2418 sit_add_v4_addrs(idev);
2420 if (dev->flags&IFF_POINTOPOINT) {
2421 addrconf_add_mroute(dev);
2422 addrconf_add_lroute(dev);
2429 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2431 struct in6_addr lladdr;
2433 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2434 addrconf_add_linklocal(idev, &lladdr);
2440 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2442 struct net_device *link_dev;
2443 struct net *net = dev_net(idev->dev);
2445 /* first try to inherit the link-local address from the link device */
2446 if (idev->dev->iflink &&
2447 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2448 if (!ipv6_inherit_linklocal(idev, link_dev))
2451 /* then try to inherit it from any device */
2452 for_each_netdev(net, link_dev) {
2453 if (!ipv6_inherit_linklocal(idev, link_dev))
2456 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2460 * Autoconfigure tunnel with a link-local address so routing protocols,
2461 * DHCPv6, MLD etc. can be run over the virtual link
2464 static void addrconf_ip6_tnl_config(struct net_device *dev)
2466 struct inet6_dev *idev;
2470 idev = addrconf_add_dev(dev);
2472 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2475 ip6_tnl_add_linklocal(idev);
2478 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2481 struct net_device *dev = (struct net_device *) data;
2482 struct inet6_dev *idev = __in6_dev_get(dev);
2483 int run_pending = 0;
2487 case NETDEV_REGISTER:
2488 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2489 idev = ipv6_add_dev(dev);
2491 return notifier_from_errno(-ENOMEM);
2497 if (dev->flags & IFF_SLAVE)
2500 if (event == NETDEV_UP) {
2501 if (!addrconf_qdisc_ok(dev)) {
2502 /* device is not ready yet. */
2504 "ADDRCONF(NETDEV_UP): %s: "
2505 "link is not ready\n",
2510 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2511 idev = ipv6_add_dev(dev);
2514 idev->if_flags |= IF_READY;
2518 if (!addrconf_qdisc_ok(dev)) {
2519 /* device is still not ready. */
2524 if (idev->if_flags & IF_READY)
2525 /* device is already configured. */
2527 idev->if_flags |= IF_READY;
2531 "ADDRCONF(NETDEV_CHANGE): %s: "
2532 "link becomes ready\n",
2538 switch (dev->type) {
2539 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2541 addrconf_sit_config(dev);
2544 case ARPHRD_TUNNEL6:
2545 addrconf_ip6_tnl_config(dev);
2547 case ARPHRD_LOOPBACK:
2552 addrconf_dev_config(dev);
2558 addrconf_dad_run(idev);
2561 * If the MTU changed during the interface down,
2562 * when the interface up, the changed MTU must be
2563 * reflected in the idev as well as routers.
2565 if (idev->cnf.mtu6 != dev->mtu &&
2566 dev->mtu >= IPV6_MIN_MTU) {
2567 rt6_mtu_change(dev, dev->mtu);
2568 idev->cnf.mtu6 = dev->mtu;
2570 idev->tstamp = jiffies;
2571 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2574 * If the changed mtu during down is lower than
2575 * IPV6_MIN_MTU stop IPv6 on this interface.
2577 if (dev->mtu < IPV6_MIN_MTU)
2578 addrconf_ifdown(dev, 1);
2582 case NETDEV_CHANGEMTU:
2583 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2584 rt6_mtu_change(dev, dev->mtu);
2585 idev->cnf.mtu6 = dev->mtu;
2589 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2590 idev = ipv6_add_dev(dev);
2596 * MTU falled under IPV6_MIN_MTU.
2597 * Stop IPv6 on this interface.
2601 case NETDEV_UNREGISTER:
2603 * Remove all addresses from this interface.
2605 addrconf_ifdown(dev, event != NETDEV_DOWN);
2608 case NETDEV_CHANGENAME:
2610 snmp6_unregister_dev(idev);
2611 addrconf_sysctl_unregister(idev);
2612 addrconf_sysctl_register(idev);
2613 err = snmp6_register_dev(idev);
2615 return notifier_from_errno(err);
2619 case NETDEV_PRE_TYPE_CHANGE:
2620 case NETDEV_POST_TYPE_CHANGE:
2621 addrconf_type_change(dev, event);
2629 * addrconf module should be notified of a device going up
2631 static struct notifier_block ipv6_dev_notf = {
2632 .notifier_call = addrconf_notify,
2635 static void addrconf_type_change(struct net_device *dev, unsigned long event)
2637 struct inet6_dev *idev;
2640 idev = __in6_dev_get(dev);
2642 if (event == NETDEV_POST_TYPE_CHANGE)
2643 ipv6_mc_remap(idev);
2644 else if (event == NETDEV_PRE_TYPE_CHANGE)
2645 ipv6_mc_unmap(idev);
2648 static int addrconf_ifdown(struct net_device *dev, int how)
2650 struct net *net = dev_net(dev);
2651 struct inet6_dev *idev;
2652 struct inet6_ifaddr *ifa;
2657 rt6_ifdown(net, dev);
2658 neigh_ifdown(&nd_tbl, dev);
2660 idev = __in6_dev_get(dev);
2665 * Step 1: remove reference to ipv6 device from parent device.
2671 /* protected by rtnl_lock */
2672 rcu_assign_pointer(dev->ip6_ptr, NULL);
2674 /* Step 1.5: remove snmp6 entry */
2675 snmp6_unregister_dev(idev);
2679 /* Step 2: clear hash table */
2680 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
2681 struct hlist_head *h = &inet6_addr_lst[i];
2682 struct hlist_node *n;
2684 spin_lock_bh(&addrconf_hash_lock);
2686 hlist_for_each_entry_rcu(ifa, n, h, addr_lst) {
2687 if (ifa->idev == idev) {
2688 hlist_del_init_rcu(&ifa->addr_lst);
2689 addrconf_del_timer(ifa);
2693 spin_unlock_bh(&addrconf_hash_lock);
2696 write_lock_bh(&idev->lock);
2698 /* Step 2: clear flags for stateless addrconf */
2700 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2702 #ifdef CONFIG_IPV6_PRIVACY
2703 if (how && del_timer(&idev->regen_timer))
2706 /* Step 3: clear tempaddr list */
2707 while (!list_empty(&idev->tempaddr_list)) {
2708 ifa = list_first_entry(&idev->tempaddr_list,
2709 struct inet6_ifaddr, tmp_list);
2710 list_del(&ifa->tmp_list);
2711 write_unlock_bh(&idev->lock);
2712 spin_lock_bh(&ifa->lock);
2715 in6_ifa_put(ifa->ifpub);
2718 spin_unlock_bh(&ifa->lock);
2720 write_lock_bh(&idev->lock);
2724 while (!list_empty(&idev->addr_list)) {
2725 ifa = list_first_entry(&idev->addr_list,
2726 struct inet6_ifaddr, if_list);
2727 addrconf_del_timer(ifa);
2729 list_del(&ifa->if_list);
2731 write_unlock_bh(&idev->lock);
2733 spin_lock_bh(&ifa->state_lock);
2735 ifa->state = INET6_IFADDR_STATE_DEAD;
2736 spin_unlock_bh(&ifa->state_lock);
2738 if (state != INET6_IFADDR_STATE_DEAD) {
2739 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2740 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2744 write_lock_bh(&idev->lock);
2747 write_unlock_bh(&idev->lock);
2749 /* Step 5: Discard multicast list */
2751 ipv6_mc_destroy_dev(idev);
2755 idev->tstamp = jiffies;
2757 /* Last: Shot the device (if unregistered) */
2759 addrconf_sysctl_unregister(idev);
2760 neigh_parms_release(&nd_tbl, idev->nd_parms);
2761 neigh_ifdown(&nd_tbl, dev);
2767 static void addrconf_rs_timer(unsigned long data)
2769 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2770 struct inet6_dev *idev = ifp->idev;
2772 read_lock(&idev->lock);
2773 if (idev->dead || !(idev->if_flags & IF_READY))
2776 if (idev->cnf.forwarding)
2779 /* Announcement received after solicitation was sent */
2780 if (idev->if_flags & IF_RA_RCVD)
2783 spin_lock(&ifp->lock);
2784 if (ifp->probes++ < idev->cnf.rtr_solicits) {
2785 /* The wait after the last probe can be shorter */
2786 addrconf_mod_timer(ifp, AC_RS,
2787 (ifp->probes == idev->cnf.rtr_solicits) ?
2788 idev->cnf.rtr_solicit_delay :
2789 idev->cnf.rtr_solicit_interval);
2790 spin_unlock(&ifp->lock);
2792 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2794 spin_unlock(&ifp->lock);
2796 * Note: we do not support deprecated "all on-link"
2797 * assumption any longer.
2799 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2804 read_unlock(&idev->lock);
2809 * Duplicate Address Detection
2811 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2813 unsigned long rand_num;
2814 struct inet6_dev *idev = ifp->idev;
2816 if (ifp->flags & IFA_F_OPTIMISTIC)
2819 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2821 ifp->probes = idev->cnf.dad_transmits;
2822 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2825 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2827 struct inet6_dev *idev = ifp->idev;
2828 struct net_device *dev = idev->dev;
2830 addrconf_join_solict(dev, &ifp->addr);
2832 net_srandom(ifp->addr.s6_addr32[3]);
2834 read_lock_bh(&idev->lock);
2835 spin_lock(&ifp->lock);
2836 if (ifp->state == INET6_IFADDR_STATE_DEAD)
2839 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2840 idev->cnf.accept_dad < 1 ||
2841 !(ifp->flags&IFA_F_TENTATIVE) ||
2842 ifp->flags & IFA_F_NODAD) {
2843 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2844 spin_unlock(&ifp->lock);
2845 read_unlock_bh(&idev->lock);
2847 addrconf_dad_completed(ifp);
2851 if (!(idev->if_flags & IF_READY)) {
2852 spin_unlock(&ifp->lock);
2853 read_unlock_bh(&idev->lock);
2855 * If the device is not ready:
2856 * - keep it tentative if it is a permanent address.
2857 * - otherwise, kill it.
2860 addrconf_dad_stop(ifp, 0);
2865 * Optimistic nodes can start receiving
2868 if (ifp->flags & IFA_F_OPTIMISTIC)
2869 ip6_ins_rt(ifp->rt);
2871 addrconf_dad_kick(ifp);
2873 spin_unlock(&ifp->lock);
2874 read_unlock_bh(&idev->lock);
2877 static void addrconf_dad_timer(unsigned long data)
2879 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2880 struct inet6_dev *idev = ifp->idev;
2881 struct in6_addr mcaddr;
2883 if (!ifp->probes && addrconf_dad_end(ifp))
2886 read_lock(&idev->lock);
2887 if (idev->dead || !(idev->if_flags & IF_READY)) {
2888 read_unlock(&idev->lock);
2892 spin_lock(&ifp->lock);
2893 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
2894 spin_unlock(&ifp->lock);
2895 read_unlock(&idev->lock);
2899 if (ifp->probes == 0) {
2901 * DAD was successful
2904 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2905 spin_unlock(&ifp->lock);
2906 read_unlock(&idev->lock);
2908 addrconf_dad_completed(ifp);
2914 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2915 spin_unlock(&ifp->lock);
2916 read_unlock(&idev->lock);
2918 /* send a neighbour solicitation for our addr */
2919 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2920 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
2925 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2927 struct net_device *dev = ifp->idev->dev;
2930 * Configure the address for reception. Now it is valid.
2933 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2935 /* If added prefix is link local and forwarding is off,
2936 start sending router solicitations.
2939 if ((ifp->idev->cnf.forwarding == 0 ||
2940 ifp->idev->cnf.forwarding == 2) &&
2941 ifp->idev->cnf.rtr_solicits > 0 &&
2942 (dev->flags&IFF_LOOPBACK) == 0 &&
2943 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2945 * If a host as already performed a random delay
2946 * [...] as part of DAD [...] there is no need
2947 * to delay again before sending the first RS
2949 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2951 spin_lock_bh(&ifp->lock);
2953 ifp->idev->if_flags |= IF_RS_SENT;
2954 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2955 spin_unlock_bh(&ifp->lock);
2959 static void addrconf_dad_run(struct inet6_dev *idev)
2961 struct inet6_ifaddr *ifp;
2963 read_lock_bh(&idev->lock);
2964 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2965 spin_lock(&ifp->lock);
2966 if (ifp->flags & IFA_F_TENTATIVE &&
2967 ifp->state == INET6_IFADDR_STATE_DAD)
2968 addrconf_dad_kick(ifp);
2969 spin_unlock(&ifp->lock);
2971 read_unlock_bh(&idev->lock);
2974 #ifdef CONFIG_PROC_FS
2975 struct if6_iter_state {
2976 struct seq_net_private p;
2980 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2982 struct inet6_ifaddr *ifa = NULL;
2983 struct if6_iter_state *state = seq->private;
2984 struct net *net = seq_file_net(seq);
2986 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2987 struct hlist_node *n;
2988 hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket],
2990 if (net_eq(dev_net(ifa->idev->dev), net))
2996 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
2997 struct inet6_ifaddr *ifa)
2999 struct if6_iter_state *state = seq->private;
3000 struct net *net = seq_file_net(seq);
3001 struct hlist_node *n = &ifa->addr_lst;
3003 hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst)
3004 if (net_eq(dev_net(ifa->idev->dev), net))
3007 while (++state->bucket < IN6_ADDR_HSIZE) {
3008 hlist_for_each_entry_rcu_bh(ifa, n,
3009 &inet6_addr_lst[state->bucket], addr_lst) {
3010 if (net_eq(dev_net(ifa->idev->dev), net))
3018 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
3020 struct inet6_ifaddr *ifa = if6_get_first(seq);
3023 while (pos && (ifa = if6_get_next(seq, ifa)) != NULL)
3025 return pos ? NULL : ifa;
3028 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3032 return if6_get_idx(seq, *pos);
3035 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3037 struct inet6_ifaddr *ifa;
3039 ifa = if6_get_next(seq, v);
3044 static void if6_seq_stop(struct seq_file *seq, void *v)
3047 rcu_read_unlock_bh();
3050 static int if6_seq_show(struct seq_file *seq, void *v)
3052 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3053 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3055 ifp->idev->dev->ifindex,
3059 ifp->idev->dev->name);
3063 static const struct seq_operations if6_seq_ops = {
3064 .start = if6_seq_start,
3065 .next = if6_seq_next,
3066 .show = if6_seq_show,
3067 .stop = if6_seq_stop,
3070 static int if6_seq_open(struct inode *inode, struct file *file)
3072 return seq_open_net(inode, file, &if6_seq_ops,
3073 sizeof(struct if6_iter_state));
3076 static const struct file_operations if6_fops = {
3077 .owner = THIS_MODULE,
3078 .open = if6_seq_open,
3080 .llseek = seq_lseek,
3081 .release = seq_release_net,
3084 static int __net_init if6_proc_net_init(struct net *net)
3086 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
3091 static void __net_exit if6_proc_net_exit(struct net *net)
3093 proc_net_remove(net, "if_inet6");
3096 static struct pernet_operations if6_proc_net_ops = {
3097 .init = if6_proc_net_init,
3098 .exit = if6_proc_net_exit,
3101 int __init if6_proc_init(void)
3103 return register_pernet_subsys(&if6_proc_net_ops);
3106 void if6_proc_exit(void)
3108 unregister_pernet_subsys(&if6_proc_net_ops);
3110 #endif /* CONFIG_PROC_FS */
3112 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3113 /* Check if address is a home address configured on any interface. */
3114 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3117 struct inet6_ifaddr *ifp = NULL;
3118 struct hlist_node *n;
3119 unsigned int hash = ipv6_addr_hash(addr);
3122 hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) {
3123 if (!net_eq(dev_net(ifp->idev->dev), net))
3125 if (ipv6_addr_equal(&ifp->addr, addr) &&
3126 (ifp->flags & IFA_F_HOMEADDRESS)) {
3131 rcu_read_unlock_bh();
3137 * Periodic address status verification
3140 static void addrconf_verify(unsigned long foo)
3142 unsigned long now, next, next_sec, next_sched;
3143 struct inet6_ifaddr *ifp;
3144 struct hlist_node *node;
3148 spin_lock(&addrconf_verify_lock);
3150 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3152 del_timer(&addr_chk_timer);
3154 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3156 hlist_for_each_entry_rcu_bh(ifp, node,
3157 &inet6_addr_lst[i], addr_lst) {
3160 if (ifp->flags & IFA_F_PERMANENT)
3163 spin_lock(&ifp->lock);
3164 /* We try to batch several events at once. */
3165 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3167 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3168 age >= ifp->valid_lft) {
3169 spin_unlock(&ifp->lock);
3173 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3174 spin_unlock(&ifp->lock);
3176 } else if (age >= ifp->prefered_lft) {
3177 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3180 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3182 ifp->flags |= IFA_F_DEPRECATED;
3185 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3186 next = ifp->tstamp + ifp->valid_lft * HZ;
3188 spin_unlock(&ifp->lock);
3193 ipv6_ifa_notify(0, ifp);
3197 #ifdef CONFIG_IPV6_PRIVACY
3198 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3199 !(ifp->flags&IFA_F_TENTATIVE)) {
3200 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3201 ifp->idev->cnf.dad_transmits *
3202 ifp->idev->nd_parms->retrans_time / HZ;
3204 if (age >= ifp->prefered_lft - regen_advance) {
3205 struct inet6_ifaddr *ifpub = ifp->ifpub;
3206 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3207 next = ifp->tstamp + ifp->prefered_lft * HZ;
3208 if (!ifp->regen_count && ifpub) {
3211 in6_ifa_hold(ifpub);
3212 spin_unlock(&ifp->lock);
3214 spin_lock(&ifpub->lock);
3215 ifpub->regen_count = 0;
3216 spin_unlock(&ifpub->lock);
3217 ipv6_create_tempaddr(ifpub, ifp);
3222 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3223 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3224 spin_unlock(&ifp->lock);
3227 /* ifp->prefered_lft <= ifp->valid_lft */
3228 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3229 next = ifp->tstamp + ifp->prefered_lft * HZ;
3230 spin_unlock(&ifp->lock);
3235 next_sec = round_jiffies_up(next);
3238 /* If rounded timeout is accurate enough, accept it. */
3239 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3240 next_sched = next_sec;
3242 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3243 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3244 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3246 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3247 now, next, next_sec, next_sched));
3249 addr_chk_timer.expires = next_sched;
3250 add_timer(&addr_chk_timer);
3251 spin_unlock(&addrconf_verify_lock);
3252 rcu_read_unlock_bh();
3255 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3257 struct in6_addr *pfx = NULL;
3260 pfx = nla_data(addr);
3263 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3266 pfx = nla_data(local);
3272 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3273 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3274 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3275 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3279 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3281 struct net *net = sock_net(skb->sk);
3282 struct ifaddrmsg *ifm;
3283 struct nlattr *tb[IFA_MAX+1];
3284 struct in6_addr *pfx;
3287 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3291 ifm = nlmsg_data(nlh);
3292 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3296 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3299 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3300 u32 prefered_lft, u32 valid_lft)
3304 unsigned long timeout;
3306 if (!valid_lft || (prefered_lft > valid_lft))
3309 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3310 if (addrconf_finite_timeout(timeout)) {
3311 expires = jiffies_to_clock_t(timeout * HZ);
3312 valid_lft = timeout;
3313 flags = RTF_EXPIRES;
3317 ifa_flags |= IFA_F_PERMANENT;
3320 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3321 if (addrconf_finite_timeout(timeout)) {
3323 ifa_flags |= IFA_F_DEPRECATED;
3324 prefered_lft = timeout;
3327 spin_lock_bh(&ifp->lock);
3328 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3329 ifp->tstamp = jiffies;
3330 ifp->valid_lft = valid_lft;
3331 ifp->prefered_lft = prefered_lft;
3333 spin_unlock_bh(&ifp->lock);
3334 if (!(ifp->flags&IFA_F_TENTATIVE))
3335 ipv6_ifa_notify(0, ifp);
3337 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3345 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3347 struct net *net = sock_net(skb->sk);
3348 struct ifaddrmsg *ifm;
3349 struct nlattr *tb[IFA_MAX+1];
3350 struct in6_addr *pfx;
3351 struct inet6_ifaddr *ifa;
3352 struct net_device *dev;
3353 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3357 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3361 ifm = nlmsg_data(nlh);
3362 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3366 if (tb[IFA_CACHEINFO]) {
3367 struct ifa_cacheinfo *ci;
3369 ci = nla_data(tb[IFA_CACHEINFO]);
3370 valid_lft = ci->ifa_valid;
3371 preferred_lft = ci->ifa_prefered;
3373 preferred_lft = INFINITY_LIFE_TIME;
3374 valid_lft = INFINITY_LIFE_TIME;
3377 dev = __dev_get_by_index(net, ifm->ifa_index);
3381 /* We ignore other flags so far. */
3382 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3384 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3387 * It would be best to check for !NLM_F_CREATE here but
3388 * userspace alreay relies on not having to provide this.
3390 return inet6_addr_add(net, ifm->ifa_index, pfx,
3391 ifm->ifa_prefixlen, ifa_flags,
3392 preferred_lft, valid_lft);
3395 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3396 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3399 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3406 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3407 u8 scope, int ifindex)
3409 struct ifaddrmsg *ifm;
3411 ifm = nlmsg_data(nlh);
3412 ifm->ifa_family = AF_INET6;
3413 ifm->ifa_prefixlen = prefixlen;
3414 ifm->ifa_flags = flags;
3415 ifm->ifa_scope = scope;
3416 ifm->ifa_index = ifindex;
3419 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3420 unsigned long tstamp, u32 preferred, u32 valid)
3422 struct ifa_cacheinfo ci;
3424 ci.cstamp = cstamp_delta(cstamp);
3425 ci.tstamp = cstamp_delta(tstamp);
3426 ci.ifa_prefered = preferred;
3427 ci.ifa_valid = valid;
3429 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3432 static inline int rt_scope(int ifa_scope)
3434 if (ifa_scope & IFA_HOST)
3435 return RT_SCOPE_HOST;
3436 else if (ifa_scope & IFA_LINK)
3437 return RT_SCOPE_LINK;
3438 else if (ifa_scope & IFA_SITE)
3439 return RT_SCOPE_SITE;
3441 return RT_SCOPE_UNIVERSE;
3444 static inline int inet6_ifaddr_msgsize(void)
3446 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3447 + nla_total_size(16) /* IFA_ADDRESS */
3448 + nla_total_size(sizeof(struct ifa_cacheinfo));
3451 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3452 u32 pid, u32 seq, int event, unsigned int flags)
3454 struct nlmsghdr *nlh;
3455 u32 preferred, valid;
3457 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3461 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3462 ifa->idev->dev->ifindex);
3464 if (!(ifa->flags&IFA_F_PERMANENT)) {
3465 preferred = ifa->prefered_lft;
3466 valid = ifa->valid_lft;
3467 if (preferred != INFINITY_LIFE_TIME) {
3468 long tval = (jiffies - ifa->tstamp)/HZ;
3469 if (preferred > tval)
3473 if (valid != INFINITY_LIFE_TIME) {
3481 preferred = INFINITY_LIFE_TIME;
3482 valid = INFINITY_LIFE_TIME;
3485 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3486 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3487 nlmsg_cancel(skb, nlh);
3491 return nlmsg_end(skb, nlh);
3494 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3495 u32 pid, u32 seq, int event, u16 flags)
3497 struct nlmsghdr *nlh;
3498 u8 scope = RT_SCOPE_UNIVERSE;
3499 int ifindex = ifmca->idev->dev->ifindex;
3501 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3502 scope = RT_SCOPE_SITE;
3504 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3508 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3509 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3510 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3511 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3512 nlmsg_cancel(skb, nlh);
3516 return nlmsg_end(skb, nlh);
3519 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3520 u32 pid, u32 seq, int event, unsigned int flags)
3522 struct nlmsghdr *nlh;
3523 u8 scope = RT_SCOPE_UNIVERSE;
3524 int ifindex = ifaca->aca_idev->dev->ifindex;
3526 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3527 scope = RT_SCOPE_SITE;
3529 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3533 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3534 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3535 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3536 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3537 nlmsg_cancel(skb, nlh);
3541 return nlmsg_end(skb, nlh);
3550 /* called with rcu_read_lock() */
3551 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3552 struct netlink_callback *cb, enum addr_type_t type,
3553 int s_ip_idx, int *p_ip_idx)
3555 struct ifmcaddr6 *ifmca;
3556 struct ifacaddr6 *ifaca;
3558 int ip_idx = *p_ip_idx;
3560 read_lock_bh(&idev->lock);
3562 case UNICAST_ADDR: {
3563 struct inet6_ifaddr *ifa;
3565 /* unicast address incl. temp addr */
3566 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3567 if (++ip_idx < s_ip_idx)
3569 err = inet6_fill_ifaddr(skb, ifa,
3570 NETLINK_CB(cb->skb).pid,
3579 case MULTICAST_ADDR:
3580 /* multicast address */
3581 for (ifmca = idev->mc_list; ifmca;
3582 ifmca = ifmca->next, ip_idx++) {
3583 if (ip_idx < s_ip_idx)
3585 err = inet6_fill_ifmcaddr(skb, ifmca,
3586 NETLINK_CB(cb->skb).pid,
3595 /* anycast address */
3596 for (ifaca = idev->ac_list; ifaca;
3597 ifaca = ifaca->aca_next, ip_idx++) {
3598 if (ip_idx < s_ip_idx)
3600 err = inet6_fill_ifacaddr(skb, ifaca,
3601 NETLINK_CB(cb->skb).pid,
3612 read_unlock_bh(&idev->lock);
3617 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3618 enum addr_type_t type)
3620 struct net *net = sock_net(skb->sk);
3623 int s_idx, s_ip_idx;
3624 struct net_device *dev;
3625 struct inet6_dev *idev;
3626 struct hlist_head *head;
3627 struct hlist_node *node;
3630 s_idx = idx = cb->args[1];
3631 s_ip_idx = ip_idx = cb->args[2];
3634 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3636 head = &net->dev_index_head[h];
3637 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3640 if (h > s_h || idx > s_idx)
3643 idev = __in6_dev_get(dev);
3647 if (in6_dump_addrs(idev, skb, cb, type,
3648 s_ip_idx, &ip_idx) <= 0)
3658 cb->args[2] = ip_idx;
3663 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3665 enum addr_type_t type = UNICAST_ADDR;
3667 return inet6_dump_addr(skb, cb, type);
3670 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3672 enum addr_type_t type = MULTICAST_ADDR;
3674 return inet6_dump_addr(skb, cb, type);
3678 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3680 enum addr_type_t type = ANYCAST_ADDR;
3682 return inet6_dump_addr(skb, cb, type);
3685 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3688 struct net *net = sock_net(in_skb->sk);
3689 struct ifaddrmsg *ifm;
3690 struct nlattr *tb[IFA_MAX+1];
3691 struct in6_addr *addr = NULL;
3692 struct net_device *dev = NULL;
3693 struct inet6_ifaddr *ifa;
3694 struct sk_buff *skb;
3697 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3701 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3707 ifm = nlmsg_data(nlh);
3709 dev = __dev_get_by_index(net, ifm->ifa_index);
3711 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
3713 err = -EADDRNOTAVAIL;
3717 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
3723 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3724 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3726 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3727 WARN_ON(err == -EMSGSIZE);
3731 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
3738 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3740 struct sk_buff *skb;
3741 struct net *net = dev_net(ifa->idev->dev);
3744 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3748 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3750 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3751 WARN_ON(err == -EMSGSIZE);
3755 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3759 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3762 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3763 __s32 *array, int bytes)
3765 BUG_ON(bytes < (DEVCONF_MAX * 4));
3767 memset(array, 0, bytes);
3768 array[DEVCONF_FORWARDING] = cnf->forwarding;
3769 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3770 array[DEVCONF_MTU6] = cnf->mtu6;
3771 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3772 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3773 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3774 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3775 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3776 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
3777 jiffies_to_msecs(cnf->rtr_solicit_interval);
3778 array[DEVCONF_RTR_SOLICIT_DELAY] =
3779 jiffies_to_msecs(cnf->rtr_solicit_delay);
3780 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3781 #ifdef CONFIG_IPV6_PRIVACY
3782 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3783 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3784 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3785 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3786 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3788 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3789 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3790 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3791 #ifdef CONFIG_IPV6_ROUTER_PREF
3792 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3793 array[DEVCONF_RTR_PROBE_INTERVAL] =
3794 jiffies_to_msecs(cnf->rtr_probe_interval);
3795 #ifdef CONFIG_IPV6_ROUTE_INFO
3796 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3799 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3800 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3801 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3802 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3804 #ifdef CONFIG_IPV6_MROUTE
3805 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3807 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
3808 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
3809 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
3812 static inline size_t inet6_ifla6_size(void)
3814 return nla_total_size(4) /* IFLA_INET6_FLAGS */
3815 + nla_total_size(sizeof(struct ifla_cacheinfo))
3816 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3817 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3818 + nla_total_size(ICMP6_MIB_MAX * 8); /* IFLA_INET6_ICMP6STATS */
3821 static inline size_t inet6_if_nlmsg_size(void)
3823 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3824 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3825 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3826 + nla_total_size(4) /* IFLA_MTU */
3827 + nla_total_size(4) /* IFLA_LINK */
3828 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
3831 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
3832 int items, int bytes)
3835 int pad = bytes - sizeof(u64) * items;
3838 /* Use put_unaligned() because stats may not be aligned for u64. */
3839 put_unaligned(items, &stats[0]);
3840 for (i = 1; i < items; i++)
3841 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
3843 memset(&stats[items], 0, pad);
3846 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
3847 int items, int bytes, size_t syncpoff)
3850 int pad = bytes - sizeof(u64) * items;
3853 /* Use put_unaligned() because stats may not be aligned for u64. */
3854 put_unaligned(items, &stats[0]);
3855 for (i = 1; i < items; i++)
3856 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
3858 memset(&stats[items], 0, pad);
3861 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3865 case IFLA_INET6_STATS:
3866 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
3867 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
3869 case IFLA_INET6_ICMP6STATS:
3870 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
3875 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
3878 struct ifla_cacheinfo ci;
3880 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3882 ci.max_reasm_len = IPV6_MAXPLEN;
3883 ci.tstamp = cstamp_delta(idev->tstamp);
3884 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
3885 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
3886 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3888 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3890 goto nla_put_failure;
3891 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3893 /* XXX - MC not implemented */
3895 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3897 goto nla_put_failure;
3898 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3900 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3902 goto nla_put_failure;
3903 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3911 static size_t inet6_get_link_af_size(const struct net_device *dev)
3913 if (!__in6_dev_get(dev))
3916 return inet6_ifla6_size();
3919 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
3921 struct inet6_dev *idev = __in6_dev_get(dev);
3926 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
3932 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3933 u32 pid, u32 seq, int event, unsigned int flags)
3935 struct net_device *dev = idev->dev;
3936 struct ifinfomsg *hdr;
3937 struct nlmsghdr *nlh;
3940 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3944 hdr = nlmsg_data(nlh);
3945 hdr->ifi_family = AF_INET6;
3947 hdr->ifi_type = dev->type;
3948 hdr->ifi_index = dev->ifindex;
3949 hdr->ifi_flags = dev_get_flags(dev);
3950 hdr->ifi_change = 0;
3952 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3955 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3957 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3958 if (dev->ifindex != dev->iflink)
3959 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3961 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3962 if (protoinfo == NULL)
3963 goto nla_put_failure;
3965 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
3966 goto nla_put_failure;
3968 nla_nest_end(skb, protoinfo);
3969 return nlmsg_end(skb, nlh);
3972 nlmsg_cancel(skb, nlh);
3976 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3978 struct net *net = sock_net(skb->sk);
3981 struct net_device *dev;
3982 struct inet6_dev *idev;
3983 struct hlist_head *head;
3984 struct hlist_node *node;
3987 s_idx = cb->args[1];
3990 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3992 head = &net->dev_index_head[h];
3993 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3996 idev = __in6_dev_get(dev);
3999 if (inet6_fill_ifinfo(skb, idev,
4000 NETLINK_CB(cb->skb).pid,
4002 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4016 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4018 struct sk_buff *skb;
4019 struct net *net = dev_net(idev->dev);
4022 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4026 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4028 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4029 WARN_ON(err == -EMSGSIZE);
4033 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4037 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4040 static inline size_t inet6_prefix_nlmsg_size(void)
4042 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4043 + nla_total_size(sizeof(struct in6_addr))
4044 + nla_total_size(sizeof(struct prefix_cacheinfo));
4047 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4048 struct prefix_info *pinfo, u32 pid, u32 seq,
4049 int event, unsigned int flags)
4051 struct prefixmsg *pmsg;
4052 struct nlmsghdr *nlh;
4053 struct prefix_cacheinfo ci;
4055 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
4059 pmsg = nlmsg_data(nlh);
4060 pmsg->prefix_family = AF_INET6;
4061 pmsg->prefix_pad1 = 0;
4062 pmsg->prefix_pad2 = 0;
4063 pmsg->prefix_ifindex = idev->dev->ifindex;
4064 pmsg->prefix_len = pinfo->prefix_len;
4065 pmsg->prefix_type = pinfo->type;
4066 pmsg->prefix_pad3 = 0;
4067 pmsg->prefix_flags = 0;
4069 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4070 if (pinfo->autoconf)
4071 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4073 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
4075 ci.preferred_time = ntohl(pinfo->prefered);
4076 ci.valid_time = ntohl(pinfo->valid);
4077 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
4079 return nlmsg_end(skb, nlh);
4082 nlmsg_cancel(skb, nlh);
4086 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4087 struct prefix_info *pinfo)
4089 struct sk_buff *skb;
4090 struct net *net = dev_net(idev->dev);
4093 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4097 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4099 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4100 WARN_ON(err == -EMSGSIZE);
4104 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4108 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4111 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4113 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4118 * If the address was optimistic
4119 * we inserted the route at the start of
4120 * our DAD process, so we don't need
4123 if (!(ifp->rt->rt6i_node))
4124 ip6_ins_rt(ifp->rt);
4125 if (ifp->idev->cnf.forwarding)
4126 addrconf_join_anycast(ifp);
4129 if (ifp->idev->cnf.forwarding)
4130 addrconf_leave_anycast(ifp);
4131 addrconf_leave_solict(ifp->idev, &ifp->addr);
4132 dst_hold(&ifp->rt->dst);
4134 if (ip6_del_rt(ifp->rt))
4135 dst_free(&ifp->rt->dst);
4140 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4143 if (likely(ifp->idev->dead == 0))
4144 __ipv6_ifa_notify(event, ifp);
4145 rcu_read_unlock_bh();
4148 #ifdef CONFIG_SYSCTL
4151 int addrconf_sysctl_forward(ctl_table *ctl, int write,
4152 void __user *buffer, size_t *lenp, loff_t *ppos)
4154 int *valp = ctl->data;
4159 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4162 ret = addrconf_fixup_forwarding(ctl, valp, val);
4168 static void dev_disable_change(struct inet6_dev *idev)
4170 if (!idev || !idev->dev)
4173 if (idev->cnf.disable_ipv6)
4174 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4176 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4179 static void addrconf_disable_change(struct net *net, __s32 newf)
4181 struct net_device *dev;
4182 struct inet6_dev *idev;
4185 for_each_netdev_rcu(net, dev) {
4186 idev = __in6_dev_get(dev);
4188 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4189 idev->cnf.disable_ipv6 = newf;
4191 dev_disable_change(idev);
4197 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int old)
4201 net = (struct net *)table->extra2;
4203 if (p == &net->ipv6.devconf_dflt->disable_ipv6)
4206 if (!rtnl_trylock()) {
4207 /* Restore the original values before restarting */
4209 return restart_syscall();
4212 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4213 __s32 newf = net->ipv6.devconf_all->disable_ipv6;
4214 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4215 addrconf_disable_change(net, newf);
4216 } else if ((!*p) ^ (!old))
4217 dev_disable_change((struct inet6_dev *)table->extra1);
4224 int addrconf_sysctl_disable(ctl_table *ctl, int write,
4225 void __user *buffer, size_t *lenp, loff_t *ppos)
4227 int *valp = ctl->data;
4232 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4235 ret = addrconf_disable_ipv6(ctl, valp, val);
4241 static struct addrconf_sysctl_table
4243 struct ctl_table_header *sysctl_header;
4244 ctl_table addrconf_vars[DEVCONF_MAX+1];
4246 } addrconf_sysctl __read_mostly = {
4247 .sysctl_header = NULL,
4250 .procname = "forwarding",
4251 .data = &ipv6_devconf.forwarding,
4252 .maxlen = sizeof(int),
4254 .proc_handler = addrconf_sysctl_forward,
4257 .procname = "hop_limit",
4258 .data = &ipv6_devconf.hop_limit,
4259 .maxlen = sizeof(int),
4261 .proc_handler = proc_dointvec,
4265 .data = &ipv6_devconf.mtu6,
4266 .maxlen = sizeof(int),
4268 .proc_handler = proc_dointvec,
4271 .procname = "accept_ra",
4272 .data = &ipv6_devconf.accept_ra,
4273 .maxlen = sizeof(int),
4275 .proc_handler = proc_dointvec,
4278 .procname = "accept_redirects",
4279 .data = &ipv6_devconf.accept_redirects,
4280 .maxlen = sizeof(int),
4282 .proc_handler = proc_dointvec,
4285 .procname = "autoconf",
4286 .data = &ipv6_devconf.autoconf,
4287 .maxlen = sizeof(int),
4289 .proc_handler = proc_dointvec,
4292 .procname = "dad_transmits",
4293 .data = &ipv6_devconf.dad_transmits,
4294 .maxlen = sizeof(int),
4296 .proc_handler = proc_dointvec,
4299 .procname = "router_solicitations",
4300 .data = &ipv6_devconf.rtr_solicits,
4301 .maxlen = sizeof(int),
4303 .proc_handler = proc_dointvec,
4306 .procname = "router_solicitation_interval",
4307 .data = &ipv6_devconf.rtr_solicit_interval,
4308 .maxlen = sizeof(int),
4310 .proc_handler = proc_dointvec_jiffies,
4313 .procname = "router_solicitation_delay",
4314 .data = &ipv6_devconf.rtr_solicit_delay,
4315 .maxlen = sizeof(int),
4317 .proc_handler = proc_dointvec_jiffies,
4320 .procname = "force_mld_version",
4321 .data = &ipv6_devconf.force_mld_version,
4322 .maxlen = sizeof(int),
4324 .proc_handler = proc_dointvec,
4326 #ifdef CONFIG_IPV6_PRIVACY
4328 .procname = "use_tempaddr",
4329 .data = &ipv6_devconf.use_tempaddr,
4330 .maxlen = sizeof(int),
4332 .proc_handler = proc_dointvec,
4335 .procname = "temp_valid_lft",
4336 .data = &ipv6_devconf.temp_valid_lft,
4337 .maxlen = sizeof(int),
4339 .proc_handler = proc_dointvec,
4342 .procname = "temp_prefered_lft",
4343 .data = &ipv6_devconf.temp_prefered_lft,
4344 .maxlen = sizeof(int),
4346 .proc_handler = proc_dointvec,
4349 .procname = "regen_max_retry",
4350 .data = &ipv6_devconf.regen_max_retry,
4351 .maxlen = sizeof(int),
4353 .proc_handler = proc_dointvec,
4356 .procname = "max_desync_factor",
4357 .data = &ipv6_devconf.max_desync_factor,
4358 .maxlen = sizeof(int),
4360 .proc_handler = proc_dointvec,
4364 .procname = "max_addresses",
4365 .data = &ipv6_devconf.max_addresses,
4366 .maxlen = sizeof(int),
4368 .proc_handler = proc_dointvec,
4371 .procname = "accept_ra_defrtr",
4372 .data = &ipv6_devconf.accept_ra_defrtr,
4373 .maxlen = sizeof(int),
4375 .proc_handler = proc_dointvec,
4378 .procname = "accept_ra_pinfo",
4379 .data = &ipv6_devconf.accept_ra_pinfo,
4380 .maxlen = sizeof(int),
4382 .proc_handler = proc_dointvec,
4384 #ifdef CONFIG_IPV6_ROUTER_PREF
4386 .procname = "accept_ra_rtr_pref",
4387 .data = &ipv6_devconf.accept_ra_rtr_pref,
4388 .maxlen = sizeof(int),
4390 .proc_handler = proc_dointvec,
4393 .procname = "router_probe_interval",
4394 .data = &ipv6_devconf.rtr_probe_interval,
4395 .maxlen = sizeof(int),
4397 .proc_handler = proc_dointvec_jiffies,
4399 #ifdef CONFIG_IPV6_ROUTE_INFO
4401 .procname = "accept_ra_rt_info_max_plen",
4402 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4403 .maxlen = sizeof(int),
4405 .proc_handler = proc_dointvec,
4410 .procname = "proxy_ndp",
4411 .data = &ipv6_devconf.proxy_ndp,
4412 .maxlen = sizeof(int),
4414 .proc_handler = proc_dointvec,
4417 .procname = "accept_source_route",
4418 .data = &ipv6_devconf.accept_source_route,
4419 .maxlen = sizeof(int),
4421 .proc_handler = proc_dointvec,
4423 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4425 .procname = "optimistic_dad",
4426 .data = &ipv6_devconf.optimistic_dad,
4427 .maxlen = sizeof(int),
4429 .proc_handler = proc_dointvec,
4433 #ifdef CONFIG_IPV6_MROUTE
4435 .procname = "mc_forwarding",
4436 .data = &ipv6_devconf.mc_forwarding,
4437 .maxlen = sizeof(int),
4439 .proc_handler = proc_dointvec,
4443 .procname = "disable_ipv6",
4444 .data = &ipv6_devconf.disable_ipv6,
4445 .maxlen = sizeof(int),
4447 .proc_handler = addrconf_sysctl_disable,
4450 .procname = "accept_dad",
4451 .data = &ipv6_devconf.accept_dad,
4452 .maxlen = sizeof(int),
4454 .proc_handler = proc_dointvec,
4457 .procname = "force_tllao",
4458 .data = &ipv6_devconf.force_tllao,
4459 .maxlen = sizeof(int),
4461 .proc_handler = proc_dointvec
4469 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4470 struct inet6_dev *idev, struct ipv6_devconf *p)
4473 struct addrconf_sysctl_table *t;
4475 #define ADDRCONF_CTL_PATH_DEV 3
4477 struct ctl_path addrconf_ctl_path[] = {
4478 { .procname = "net", },
4479 { .procname = "ipv6", },
4480 { .procname = "conf", },
4481 { /* to be set */ },
4486 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4490 for (i = 0; t->addrconf_vars[i].data; i++) {
4491 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
4492 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4493 t->addrconf_vars[i].extra2 = net;
4497 * Make a copy of dev_name, because '.procname' is regarded as const
4498 * by sysctl and we wouldn't want anyone to change it under our feet
4499 * (see SIOCSIFNAME).
4501 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4505 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4507 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4509 if (t->sysctl_header == NULL)
4523 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4525 struct addrconf_sysctl_table *t;
4527 if (p->sysctl == NULL)
4532 unregister_net_sysctl_table(t->sysctl_header);
4537 static void addrconf_sysctl_register(struct inet6_dev *idev)
4539 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
4540 &ndisc_ifinfo_sysctl_change);
4541 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4545 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4547 __addrconf_sysctl_unregister(&idev->cnf);
4548 neigh_sysctl_unregister(idev->nd_parms);
4554 static int __net_init addrconf_init_net(struct net *net)
4557 struct ipv6_devconf *all, *dflt;
4559 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
4563 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4565 goto err_alloc_dflt;
4567 /* these will be inherited by all namespaces */
4568 dflt->autoconf = ipv6_defaults.autoconf;
4569 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
4571 net->ipv6.devconf_all = all;
4572 net->ipv6.devconf_dflt = dflt;
4574 #ifdef CONFIG_SYSCTL
4575 err = __addrconf_sysctl_register(net, "all", NULL, all);
4579 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
4585 #ifdef CONFIG_SYSCTL
4587 __addrconf_sysctl_unregister(all);
4597 static void __net_exit addrconf_exit_net(struct net *net)
4599 #ifdef CONFIG_SYSCTL
4600 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4601 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4603 if (!net_eq(net, &init_net)) {
4604 kfree(net->ipv6.devconf_dflt);
4605 kfree(net->ipv6.devconf_all);
4609 static struct pernet_operations addrconf_ops = {
4610 .init = addrconf_init_net,
4611 .exit = addrconf_exit_net,
4618 int register_inet6addr_notifier(struct notifier_block *nb)
4620 return atomic_notifier_chain_register(&inet6addr_chain, nb);
4622 EXPORT_SYMBOL(register_inet6addr_notifier);
4624 int unregister_inet6addr_notifier(struct notifier_block *nb)
4626 return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
4628 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4630 static struct rtnl_af_ops inet6_ops = {
4632 .fill_link_af = inet6_fill_link_af,
4633 .get_link_af_size = inet6_get_link_af_size,
4637 * Init / cleanup code
4640 int __init addrconf_init(void)
4644 err = ipv6_addr_label_init();
4646 printk(KERN_CRIT "IPv6 Addrconf:"
4647 " cannot initialize default policy table: %d.\n", err);
4651 err = register_pernet_subsys(&addrconf_ops);
4655 /* The addrconf netdev notifier requires that loopback_dev
4656 * has it's ipv6 private information allocated and setup
4657 * before it can bring up and give link-local addresses
4658 * to other devices which are up.
4660 * Unfortunately, loopback_dev is not necessarily the first
4661 * entry in the global dev_base list of net devices. In fact,
4662 * it is likely to be the very last entry on that list.
4663 * So this causes the notifier registry below to try and
4664 * give link-local addresses to all devices besides loopback_dev
4665 * first, then loopback_dev, which cases all the non-loopback_dev
4666 * devices to fail to get a link-local address.
4668 * So, as a temporary fix, allocate the ipv6 structure for
4669 * loopback_dev first by hand.
4670 * Longer term, all of the dependencies ipv6 has upon the loopback
4671 * device and it being up should be removed.
4674 if (!ipv6_add_dev(init_net.loopback_dev))
4680 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4681 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
4683 register_netdevice_notifier(&ipv6_dev_notf);
4687 err = rtnl_af_register(&inet6_ops);
4691 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
4696 /* Only the first call to __rtnl_register can fail */
4697 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
4698 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
4699 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
4700 inet6_dump_ifaddr, NULL);
4701 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
4702 inet6_dump_ifmcaddr, NULL);
4703 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
4704 inet6_dump_ifacaddr, NULL);
4706 ipv6_addr_label_rtnl_register();
4710 rtnl_af_unregister(&inet6_ops);
4712 unregister_netdevice_notifier(&ipv6_dev_notf);
4714 unregister_pernet_subsys(&addrconf_ops);
4716 ipv6_addr_label_cleanup();
4721 void addrconf_cleanup(void)
4723 struct net_device *dev;
4726 unregister_netdevice_notifier(&ipv6_dev_notf);
4727 unregister_pernet_subsys(&addrconf_ops);
4728 ipv6_addr_label_cleanup();
4732 __rtnl_af_unregister(&inet6_ops);
4734 /* clean dev list */
4735 for_each_netdev(&init_net, dev) {
4736 if (__in6_dev_get(dev) == NULL)
4738 addrconf_ifdown(dev, 1);
4740 addrconf_ifdown(init_net.loopback_dev, 2);
4745 spin_lock_bh(&addrconf_hash_lock);
4746 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4747 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
4748 spin_unlock_bh(&addrconf_hash_lock);
4750 del_timer(&addr_chk_timer);