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>
90 #include <linux/export.h>
92 /* Set to 3 to get tracing... */
96 #define ADBG(x) printk x
101 #define INFINITY_LIFE_TIME 0xFFFFFFFF
103 static inline u32 cstamp_delta(unsigned long cstamp)
105 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
108 #define ADDRCONF_TIMER_FUZZ_MINUS (HZ > 50 ? HZ/50 : 1)
109 #define ADDRCONF_TIMER_FUZZ (HZ / 4)
110 #define ADDRCONF_TIMER_FUZZ_MAX (HZ)
113 static void addrconf_sysctl_register(struct inet6_dev *idev);
114 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
116 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
120 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
125 #ifdef CONFIG_IPV6_PRIVACY
126 static int __ipv6_regen_rndid(struct inet6_dev *idev);
127 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
128 static void ipv6_regen_rndid(unsigned long data);
131 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
132 static int ipv6_count_addresses(struct inet6_dev *idev);
135 * Configured unicast address hash table
137 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
138 static DEFINE_SPINLOCK(addrconf_hash_lock);
140 static void addrconf_verify(unsigned long);
142 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
143 static DEFINE_SPINLOCK(addrconf_verify_lock);
145 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
146 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
148 static void addrconf_type_change(struct net_device *dev,
149 unsigned long event);
150 static int addrconf_ifdown(struct net_device *dev, int how);
152 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
153 static void addrconf_dad_timer(unsigned long data);
154 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
155 static void addrconf_dad_run(struct inet6_dev *idev);
156 static void addrconf_rs_timer(unsigned long data);
157 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
158 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
160 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
161 struct prefix_info *pinfo);
162 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
163 struct net_device *dev);
165 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
167 static struct ipv6_devconf ipv6_devconf __read_mostly = {
169 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
170 .mtu6 = IPV6_MIN_MTU,
172 .accept_redirects = 1,
174 .force_mld_version = 0,
176 .rtr_solicits = MAX_RTR_SOLICITATIONS,
177 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
178 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
179 #ifdef CONFIG_IPV6_PRIVACY
181 .temp_valid_lft = TEMP_VALID_LIFETIME,
182 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
183 .regen_max_retry = REGEN_MAX_RETRY,
184 .max_desync_factor = MAX_DESYNC_FACTOR,
186 .max_addresses = IPV6_MAX_ADDRESSES,
187 .accept_ra_defrtr = 1,
188 .accept_ra_min_hop_limit= 1,
189 .accept_ra_pinfo = 1,
190 #ifdef CONFIG_IPV6_ROUTER_PREF
191 .accept_ra_rtr_pref = 1,
192 .rtr_probe_interval = 60 * HZ,
193 #ifdef CONFIG_IPV6_ROUTE_INFO
194 .accept_ra_rt_info_max_plen = 0,
198 .accept_source_route = 0, /* we do not accept RH0 by default. */
203 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
205 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
206 .mtu6 = IPV6_MIN_MTU,
208 .accept_redirects = 1,
211 .rtr_solicits = MAX_RTR_SOLICITATIONS,
212 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
213 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
214 #ifdef CONFIG_IPV6_PRIVACY
216 .temp_valid_lft = TEMP_VALID_LIFETIME,
217 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
218 .regen_max_retry = REGEN_MAX_RETRY,
219 .max_desync_factor = MAX_DESYNC_FACTOR,
221 .max_addresses = IPV6_MAX_ADDRESSES,
222 .accept_ra_defrtr = 1,
223 .accept_ra_min_hop_limit= 1,
224 .accept_ra_pinfo = 1,
225 #ifdef CONFIG_IPV6_ROUTER_PREF
226 .accept_ra_rtr_pref = 1,
227 .rtr_probe_interval = 60 * HZ,
228 #ifdef CONFIG_IPV6_ROUTE_INFO
229 .accept_ra_rt_info_max_plen = 0,
233 .accept_source_route = 0, /* we do not accept RH0 by default. */
238 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
239 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
240 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
241 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
242 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
244 /* Check if a valid qdisc is available */
245 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
247 return !qdisc_tx_is_noop(dev);
250 /* Check if a route is valid prefix route */
251 static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
253 return (rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0;
256 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
258 if (del_timer(&ifp->timer))
262 enum addrconf_timer_t {
268 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
269 enum addrconf_timer_t what,
272 if (!del_timer(&ifp->timer))
277 ifp->timer.function = addrconf_dad_timer;
280 ifp->timer.function = addrconf_rs_timer;
285 ifp->timer.expires = jiffies + when;
286 add_timer(&ifp->timer);
289 static int snmp6_alloc_dev(struct inet6_dev *idev)
291 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
292 sizeof(struct ipstats_mib),
293 __alignof__(struct ipstats_mib)) < 0)
295 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
297 if (!idev->stats.icmpv6dev)
299 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
301 if (!idev->stats.icmpv6msgdev)
307 kfree(idev->stats.icmpv6dev);
309 snmp_mib_free((void __percpu **)idev->stats.ipv6);
314 static void snmp6_free_dev(struct inet6_dev *idev)
316 kfree(idev->stats.icmpv6msgdev);
317 kfree(idev->stats.icmpv6dev);
318 snmp_mib_free((void __percpu **)idev->stats.ipv6);
321 /* Nobody refers to this device, we may destroy it. */
323 void in6_dev_finish_destroy(struct inet6_dev *idev)
325 struct net_device *dev = idev->dev;
327 WARN_ON(!list_empty(&idev->addr_list));
328 WARN_ON(idev->mc_list != NULL);
330 #ifdef NET_REFCNT_DEBUG
331 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
335 pr_warning("Freeing alive inet6 device %p\n", idev);
338 snmp6_free_dev(idev);
339 kfree_rcu(idev, rcu);
342 EXPORT_SYMBOL(in6_dev_finish_destroy);
344 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
346 struct inet6_dev *ndev;
350 if (dev->mtu < IPV6_MIN_MTU)
353 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
358 rwlock_init(&ndev->lock);
360 INIT_LIST_HEAD(&ndev->addr_list);
362 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
363 ndev->cnf.mtu6 = dev->mtu;
364 ndev->cnf.sysctl = NULL;
365 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
366 if (ndev->nd_parms == NULL) {
370 if (ndev->cnf.forwarding)
371 dev_disable_lro(dev);
372 /* We refer to the device */
375 if (snmp6_alloc_dev(ndev) < 0) {
377 "%s(): cannot allocate memory for statistics; dev=%s.\n",
378 __func__, dev->name));
379 neigh_parms_release(&nd_tbl, ndev->nd_parms);
385 if (snmp6_register_dev(ndev) < 0) {
387 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
388 __func__, dev->name));
389 neigh_parms_release(&nd_tbl, ndev->nd_parms);
391 in6_dev_finish_destroy(ndev);
395 /* One reference from device. We must do this before
396 * we invoke __ipv6_regen_rndid().
400 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
401 ndev->cnf.accept_dad = -1;
403 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
404 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
406 "%s: Disabled Multicast RS\n",
408 ndev->cnf.rtr_solicits = 0;
412 #ifdef CONFIG_IPV6_PRIVACY
413 INIT_LIST_HEAD(&ndev->tempaddr_list);
414 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
415 if ((dev->flags&IFF_LOOPBACK) ||
416 dev->type == ARPHRD_TUNNEL ||
417 dev->type == ARPHRD_TUNNEL6 ||
418 dev->type == ARPHRD_SIT ||
419 dev->type == ARPHRD_NONE) {
420 ndev->cnf.use_tempaddr = -1;
423 ipv6_regen_rndid((unsigned long) ndev);
427 if (netif_running(dev) && addrconf_qdisc_ok(dev))
428 ndev->if_flags |= IF_READY;
430 ipv6_mc_init_dev(ndev);
431 ndev->tstamp = jiffies;
432 addrconf_sysctl_register(ndev);
433 /* protected by rtnl_lock */
434 rcu_assign_pointer(dev->ip6_ptr, ndev);
436 /* Join all-node multicast group */
437 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
439 /* Join all-router multicast group if forwarding is set */
440 if (ndev->cnf.forwarding && dev && (dev->flags & IFF_MULTICAST))
441 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
446 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
448 struct inet6_dev *idev;
452 idev = __in6_dev_get(dev);
454 idev = ipv6_add_dev(dev);
459 if (dev->flags&IFF_UP)
465 static void dev_forward_change(struct inet6_dev *idev)
467 struct net_device *dev;
468 struct inet6_ifaddr *ifa;
473 if (idev->cnf.forwarding)
474 dev_disable_lro(dev);
475 if (dev && (dev->flags & IFF_MULTICAST)) {
476 if (idev->cnf.forwarding)
477 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
479 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
482 list_for_each_entry(ifa, &idev->addr_list, if_list) {
483 if (ifa->flags&IFA_F_TENTATIVE)
485 if (idev->cnf.forwarding)
486 addrconf_join_anycast(ifa);
488 addrconf_leave_anycast(ifa);
493 static void addrconf_forward_change(struct net *net, __s32 newf)
495 struct net_device *dev;
496 struct inet6_dev *idev;
498 for_each_netdev(net, dev) {
499 idev = __in6_dev_get(dev);
501 int changed = (!idev->cnf.forwarding) ^ (!newf);
502 idev->cnf.forwarding = newf;
504 dev_forward_change(idev);
509 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
513 net = (struct net *)table->extra2;
514 if (p == &net->ipv6.devconf_dflt->forwarding)
517 if (!rtnl_trylock()) {
518 /* Restore the original values before restarting */
520 return restart_syscall();
523 if (p == &net->ipv6.devconf_all->forwarding) {
524 __s32 newf = net->ipv6.devconf_all->forwarding;
525 net->ipv6.devconf_dflt->forwarding = newf;
526 addrconf_forward_change(net, newf);
527 } else if ((!*p) ^ (!old))
528 dev_forward_change((struct inet6_dev *)table->extra1);
532 rt6_purge_dflt_routers(net);
537 /* Nobody refers to this ifaddr, destroy it */
538 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
540 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
542 #ifdef NET_REFCNT_DEBUG
543 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
546 in6_dev_put(ifp->idev);
548 if (del_timer(&ifp->timer))
549 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
551 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
552 pr_warning("Freeing alive inet6 address %p\n", ifp);
555 dst_release(&ifp->rt->dst);
561 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
564 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
567 * Each device address list is sorted in order of scope -
568 * global before linklocal.
570 list_for_each(p, &idev->addr_list) {
571 struct inet6_ifaddr *ifa
572 = list_entry(p, struct inet6_ifaddr, if_list);
573 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
577 list_add_tail(&ifp->if_list, p);
580 static u32 ipv6_addr_hash(const struct in6_addr *addr)
583 * We perform the hash function over the last 64 bits of the address
584 * This will include the IEEE address token on links that support it.
586 return jhash_2words((__force u32)addr->s6_addr32[2],
587 (__force u32)addr->s6_addr32[3], 0)
588 & (IN6_ADDR_HSIZE - 1);
591 /* On success it returns ifp with increased reference count */
593 static struct inet6_ifaddr *
594 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
595 int scope, u32 flags)
597 struct inet6_ifaddr *ifa = NULL;
601 int addr_type = ipv6_addr_type(addr);
603 if (addr_type == IPV6_ADDR_ANY ||
604 addr_type & IPV6_ADDR_MULTICAST ||
605 (!(idev->dev->flags & IFF_LOOPBACK) &&
606 addr_type & IPV6_ADDR_LOOPBACK))
607 return ERR_PTR(-EADDRNOTAVAIL);
611 err = -ENODEV; /*XXX*/
615 if (idev->cnf.disable_ipv6) {
620 spin_lock(&addrconf_hash_lock);
622 /* Ignore adding duplicate addresses on an interface */
623 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
624 ADBG(("ipv6_add_addr: already assigned\n"));
629 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
632 ADBG(("ipv6_add_addr: malloc failed\n"));
637 rt = addrconf_dst_alloc(idev, addr, 0);
643 ipv6_addr_copy(&ifa->addr, addr);
645 spin_lock_init(&ifa->lock);
646 spin_lock_init(&ifa->state_lock);
647 init_timer(&ifa->timer);
648 INIT_HLIST_NODE(&ifa->addr_lst);
649 ifa->timer.data = (unsigned long) ifa;
651 ifa->prefix_len = pfxlen;
652 ifa->flags = flags | IFA_F_TENTATIVE;
653 ifa->cstamp = ifa->tstamp = jiffies;
658 * part one of RFC 4429, section 3.3
659 * We should not configure an address as
660 * optimistic if we do not yet know the link
661 * layer address of our nexhop router
664 if (dst_get_neighbour_raw(&rt->dst) == NULL)
665 ifa->flags &= ~IFA_F_OPTIMISTIC;
672 /* Add to big hash table */
673 hash = ipv6_addr_hash(addr);
675 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
676 spin_unlock(&addrconf_hash_lock);
678 write_lock(&idev->lock);
679 /* Add to inet6_dev unicast addr list. */
680 ipv6_link_dev_addr(idev, ifa);
682 #ifdef CONFIG_IPV6_PRIVACY
683 if (ifa->flags&IFA_F_TEMPORARY) {
684 list_add(&ifa->tmp_list, &idev->tempaddr_list);
690 write_unlock(&idev->lock);
692 rcu_read_unlock_bh();
694 if (likely(err == 0))
695 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
703 spin_unlock(&addrconf_hash_lock);
707 /* This function wants to get referenced ifp and releases it before return */
709 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
711 struct inet6_ifaddr *ifa, *ifn;
712 struct inet6_dev *idev = ifp->idev;
714 int deleted = 0, onlink = 0;
715 unsigned long expires = jiffies;
717 spin_lock_bh(&ifp->state_lock);
719 ifp->state = INET6_IFADDR_STATE_DEAD;
720 spin_unlock_bh(&ifp->state_lock);
722 if (state == INET6_IFADDR_STATE_DEAD)
725 spin_lock_bh(&addrconf_hash_lock);
726 hlist_del_init_rcu(&ifp->addr_lst);
727 spin_unlock_bh(&addrconf_hash_lock);
729 write_lock_bh(&idev->lock);
730 #ifdef CONFIG_IPV6_PRIVACY
731 if (ifp->flags&IFA_F_TEMPORARY) {
732 list_del(&ifp->tmp_list);
734 in6_ifa_put(ifp->ifpub);
741 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
743 list_del_init(&ifp->if_list);
746 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
750 } else if (ifp->flags & IFA_F_PERMANENT) {
751 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
753 if (ifa->flags & IFA_F_PERMANENT) {
758 unsigned long lifetime;
763 spin_lock(&ifa->lock);
765 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
767 * Note: Because this address is
768 * not permanent, lifetime <
769 * LONG_MAX / HZ here.
771 if (time_before(expires,
772 ifa->tstamp + lifetime * HZ))
773 expires = ifa->tstamp + lifetime * HZ;
774 spin_unlock(&ifa->lock);
779 write_unlock_bh(&idev->lock);
781 addrconf_del_timer(ifp);
783 ipv6_ifa_notify(RTM_DELADDR, ifp);
785 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
788 * Purge or update corresponding prefix
790 * 1) we don't purge prefix here if address was not permanent.
791 * prefix is managed by its own lifetime.
792 * 2) if there're no addresses, delete prefix.
793 * 3) if there're still other permanent address(es),
794 * corresponding prefix is still permanent.
795 * 4) otherwise, update prefix lifetime to the
796 * longest valid lifetime among the corresponding
797 * addresses on the device.
798 * Note: subsequent RA will update lifetime.
802 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
803 struct in6_addr prefix;
805 struct net *net = dev_net(ifp->idev->dev);
806 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
807 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
809 if (rt && addrconf_is_prefix_route(rt)) {
813 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
814 rt->rt6i_expires = expires;
815 rt->rt6i_flags |= RTF_EXPIRES;
818 dst_release(&rt->dst);
821 /* clean up prefsrc entries */
822 rt6_remove_prefsrc(ifp);
827 #ifdef CONFIG_IPV6_PRIVACY
828 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
830 struct inet6_dev *idev = ifp->idev;
831 struct in6_addr addr, *tmpaddr;
832 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
833 unsigned long regen_advance;
838 unsigned long now = jiffies;
840 write_lock(&idev->lock);
842 spin_lock_bh(&ift->lock);
843 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
844 spin_unlock_bh(&ift->lock);
851 if (idev->cnf.use_tempaddr <= 0) {
852 write_unlock(&idev->lock);
854 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
859 spin_lock_bh(&ifp->lock);
860 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
861 idev->cnf.use_tempaddr = -1; /*XXX*/
862 spin_unlock_bh(&ifp->lock);
863 write_unlock(&idev->lock);
865 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
871 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
872 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
873 spin_unlock_bh(&ifp->lock);
874 write_unlock(&idev->lock);
876 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
882 memcpy(&addr.s6_addr[8], idev->rndid, 8);
883 age = (now - ifp->tstamp) / HZ;
884 tmp_valid_lft = min_t(__u32,
886 idev->cnf.temp_valid_lft + age);
887 tmp_prefered_lft = min_t(__u32,
889 idev->cnf.temp_prefered_lft + age -
890 idev->cnf.max_desync_factor);
891 tmp_plen = ifp->prefix_len;
892 max_addresses = idev->cnf.max_addresses;
893 tmp_tstamp = ifp->tstamp;
894 spin_unlock_bh(&ifp->lock);
896 regen_advance = idev->cnf.regen_max_retry *
897 idev->cnf.dad_transmits *
898 idev->nd_parms->retrans_time / HZ;
899 write_unlock(&idev->lock);
901 /* A temporary address is created only if this calculated Preferred
902 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
903 * an implementation must not create a temporary address with a zero
904 * Preferred Lifetime.
905 * Use age calculation as in addrconf_verify to avoid unnecessary
906 * temporary addresses being generated.
908 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
909 if (tmp_prefered_lft <= regen_advance + age) {
916 addr_flags = IFA_F_TEMPORARY;
917 /* set in addrconf_prefix_rcv() */
918 if (ifp->flags & IFA_F_OPTIMISTIC)
919 addr_flags |= IFA_F_OPTIMISTIC;
921 ift = ipv6_add_addr(idev, &addr, tmp_plen,
922 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
928 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
930 write_lock(&idev->lock);
934 spin_lock_bh(&ift->lock);
936 ift->valid_lft = tmp_valid_lft;
937 ift->prefered_lft = tmp_prefered_lft;
939 ift->tstamp = tmp_tstamp;
940 spin_unlock_bh(&ift->lock);
942 addrconf_dad_start(ift, 0);
951 * Choose an appropriate source address (RFC3484)
954 IPV6_SADDR_RULE_INIT = 0,
955 IPV6_SADDR_RULE_LOCAL,
956 IPV6_SADDR_RULE_SCOPE,
957 IPV6_SADDR_RULE_PREFERRED,
958 #ifdef CONFIG_IPV6_MIP6
962 IPV6_SADDR_RULE_LABEL,
963 #ifdef CONFIG_IPV6_PRIVACY
964 IPV6_SADDR_RULE_PRIVACY,
966 IPV6_SADDR_RULE_ORCHID,
967 IPV6_SADDR_RULE_PREFIX,
971 struct ipv6_saddr_score {
974 struct inet6_ifaddr *ifa;
975 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
980 struct ipv6_saddr_dst {
981 const struct in6_addr *addr;
988 static inline int ipv6_saddr_preferred(int type)
990 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
995 static int ipv6_get_saddr_eval(struct net *net,
996 struct ipv6_saddr_score *score,
997 struct ipv6_saddr_dst *dst,
1002 if (i <= score->rule) {
1004 case IPV6_SADDR_RULE_SCOPE:
1005 ret = score->scopedist;
1007 case IPV6_SADDR_RULE_PREFIX:
1008 ret = score->matchlen;
1011 ret = !!test_bit(i, score->scorebits);
1017 case IPV6_SADDR_RULE_INIT:
1018 /* Rule 0: remember if hiscore is not ready yet */
1021 case IPV6_SADDR_RULE_LOCAL:
1022 /* Rule 1: Prefer same address */
1023 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1025 case IPV6_SADDR_RULE_SCOPE:
1026 /* Rule 2: Prefer appropriate scope
1031 * ---+--+-+---> scope
1033 * | d is scope of the destination.
1035 * | \ <- smaller scope is better if
1036 * B-15 | \ if scope is enough for destinaion.
1037 * | ret = B - scope (-1 <= scope >= d <= 15).
1039 * |/ <- greater is better
1040 * -C / if scope is not enough for destination.
1041 * /| ret = scope - C (-1 <= d < scope <= 15).
1043 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1044 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1045 * Assume B = 0 and we get C > 29.
1047 ret = __ipv6_addr_src_scope(score->addr_type);
1048 if (ret >= dst->scope)
1051 ret -= 128; /* 30 is enough */
1052 score->scopedist = ret;
1054 case IPV6_SADDR_RULE_PREFERRED:
1055 /* Rule 3: Avoid deprecated and optimistic addresses */
1056 ret = ipv6_saddr_preferred(score->addr_type) ||
1057 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1059 #ifdef CONFIG_IPV6_MIP6
1060 case IPV6_SADDR_RULE_HOA:
1062 /* Rule 4: Prefer home address */
1063 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1064 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1068 case IPV6_SADDR_RULE_OIF:
1069 /* Rule 5: Prefer outgoing interface */
1070 ret = (!dst->ifindex ||
1071 dst->ifindex == score->ifa->idev->dev->ifindex);
1073 case IPV6_SADDR_RULE_LABEL:
1074 /* Rule 6: Prefer matching label */
1075 ret = ipv6_addr_label(net,
1076 &score->ifa->addr, score->addr_type,
1077 score->ifa->idev->dev->ifindex) == dst->label;
1079 #ifdef CONFIG_IPV6_PRIVACY
1080 case IPV6_SADDR_RULE_PRIVACY:
1082 /* Rule 7: Prefer public address
1083 * Note: prefer temporary address if use_tempaddr >= 2
1085 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1086 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1087 score->ifa->idev->cnf.use_tempaddr >= 2;
1088 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1092 case IPV6_SADDR_RULE_ORCHID:
1093 /* Rule 8-: Prefer ORCHID vs ORCHID or
1094 * non-ORCHID vs non-ORCHID
1096 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1097 ipv6_addr_orchid(dst->addr));
1099 case IPV6_SADDR_RULE_PREFIX:
1100 /* Rule 8: Use longest matching prefix */
1101 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1109 __set_bit(i, score->scorebits);
1115 int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
1116 const struct in6_addr *daddr, unsigned int prefs,
1117 struct in6_addr *saddr)
1119 struct ipv6_saddr_score scores[2],
1120 *score = &scores[0], *hiscore = &scores[1];
1121 struct ipv6_saddr_dst dst;
1122 struct net_device *dev;
1125 dst_type = __ipv6_addr_type(daddr);
1127 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1128 dst.scope = __ipv6_addr_src_scope(dst_type);
1129 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1133 hiscore->ifa = NULL;
1137 for_each_netdev_rcu(net, dev) {
1138 struct inet6_dev *idev;
1140 /* Candidate Source Address (section 4)
1141 * - multicast and link-local destination address,
1142 * the set of candidate source address MUST only
1143 * include addresses assigned to interfaces
1144 * belonging to the same link as the outgoing
1146 * (- For site-local destination addresses, the
1147 * set of candidate source addresses MUST only
1148 * include addresses assigned to interfaces
1149 * belonging to the same site as the outgoing
1152 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1153 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1154 dst.ifindex && dev->ifindex != dst.ifindex)
1157 idev = __in6_dev_get(dev);
1161 read_lock_bh(&idev->lock);
1162 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1166 * - Tentative Address (RFC2462 section 5.4)
1167 * - A tentative address is not considered
1168 * "assigned to an interface" in the traditional
1169 * sense, unless it is also flagged as optimistic.
1170 * - Candidate Source Address (section 4)
1171 * - In any case, anycast addresses, multicast
1172 * addresses, and the unspecified address MUST
1173 * NOT be included in a candidate set.
1175 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1176 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1179 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1181 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1182 score->addr_type & IPV6_ADDR_MULTICAST)) {
1183 LIMIT_NETDEBUG(KERN_DEBUG
1184 "ADDRCONF: unspecified / multicast address "
1185 "assigned as unicast address on %s",
1191 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1193 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1194 int minihiscore, miniscore;
1196 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1197 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1199 if (minihiscore > miniscore) {
1200 if (i == IPV6_SADDR_RULE_SCOPE &&
1201 score->scopedist > 0) {
1204 * each remaining entry
1205 * has too small (not enough)
1206 * scope, because ifa entries
1207 * are sorted by their scope
1213 } else if (minihiscore < miniscore) {
1215 in6_ifa_put(hiscore->ifa);
1217 in6_ifa_hold(score->ifa);
1219 swap(hiscore, score);
1221 /* restore our iterator */
1222 score->ifa = hiscore->ifa;
1229 read_unlock_bh(&idev->lock);
1234 return -EADDRNOTAVAIL;
1236 ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1237 in6_ifa_put(hiscore->ifa);
1240 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1242 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1243 unsigned char banned_flags)
1245 struct inet6_ifaddr *ifp;
1246 int err = -EADDRNOTAVAIL;
1248 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1249 if (ifp->scope == IFA_LINK &&
1250 !(ifp->flags & banned_flags)) {
1251 ipv6_addr_copy(addr, &ifp->addr);
1259 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1260 unsigned char banned_flags)
1262 struct inet6_dev *idev;
1263 int err = -EADDRNOTAVAIL;
1266 idev = __in6_dev_get(dev);
1268 read_lock_bh(&idev->lock);
1269 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1270 read_unlock_bh(&idev->lock);
1276 static int ipv6_count_addresses(struct inet6_dev *idev)
1279 struct inet6_ifaddr *ifp;
1281 read_lock_bh(&idev->lock);
1282 list_for_each_entry(ifp, &idev->addr_list, if_list)
1284 read_unlock_bh(&idev->lock);
1288 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1289 struct net_device *dev, int strict)
1291 struct inet6_ifaddr *ifp;
1292 struct hlist_node *node;
1293 unsigned int hash = ipv6_addr_hash(addr);
1296 hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1297 if (!net_eq(dev_net(ifp->idev->dev), net))
1299 if (ipv6_addr_equal(&ifp->addr, addr) &&
1300 !(ifp->flags&IFA_F_TENTATIVE) &&
1301 (dev == NULL || ifp->idev->dev == dev ||
1302 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1303 rcu_read_unlock_bh();
1308 rcu_read_unlock_bh();
1311 EXPORT_SYMBOL(ipv6_chk_addr);
1313 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1314 struct net_device *dev)
1316 unsigned int hash = ipv6_addr_hash(addr);
1317 struct inet6_ifaddr *ifp;
1318 struct hlist_node *node;
1320 hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1321 if (!net_eq(dev_net(ifp->idev->dev), net))
1323 if (ipv6_addr_equal(&ifp->addr, addr)) {
1324 if (dev == NULL || ifp->idev->dev == dev)
1331 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1333 struct inet6_dev *idev;
1334 struct inet6_ifaddr *ifa;
1339 idev = __in6_dev_get(dev);
1341 read_lock_bh(&idev->lock);
1342 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1343 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1348 read_unlock_bh(&idev->lock);
1354 EXPORT_SYMBOL(ipv6_chk_prefix);
1356 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1357 struct net_device *dev, int strict)
1359 struct inet6_ifaddr *ifp, *result = NULL;
1360 unsigned int hash = ipv6_addr_hash(addr);
1361 struct hlist_node *node;
1364 hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1365 if (!net_eq(dev_net(ifp->idev->dev), net))
1367 if (ipv6_addr_equal(&ifp->addr, addr)) {
1368 if (dev == NULL || ifp->idev->dev == dev ||
1369 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1376 rcu_read_unlock_bh();
1381 /* Gets referenced address, destroys ifaddr */
1383 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1385 if (ifp->flags&IFA_F_PERMANENT) {
1386 spin_lock_bh(&ifp->lock);
1387 addrconf_del_timer(ifp);
1388 ifp->flags |= IFA_F_TENTATIVE;
1390 ifp->flags |= IFA_F_DADFAILED;
1391 spin_unlock_bh(&ifp->lock);
1393 ipv6_ifa_notify(0, ifp);
1395 #ifdef CONFIG_IPV6_PRIVACY
1396 } else if (ifp->flags&IFA_F_TEMPORARY) {
1397 struct inet6_ifaddr *ifpub;
1398 spin_lock_bh(&ifp->lock);
1401 in6_ifa_hold(ifpub);
1402 spin_unlock_bh(&ifp->lock);
1403 ipv6_create_tempaddr(ifpub, ifp);
1406 spin_unlock_bh(&ifp->lock);
1414 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1418 spin_lock(&ifp->state_lock);
1419 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1420 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1423 spin_unlock(&ifp->state_lock);
1428 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1430 struct inet6_dev *idev = ifp->idev;
1432 if (addrconf_dad_end(ifp)) {
1437 if (net_ratelimit())
1438 printk(KERN_INFO "%s: IPv6 duplicate address %pI6c detected!\n",
1439 ifp->idev->dev->name, &ifp->addr);
1441 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1442 struct in6_addr addr;
1444 addr.s6_addr32[0] = htonl(0xfe800000);
1445 addr.s6_addr32[1] = 0;
1447 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1448 ipv6_addr_equal(&ifp->addr, &addr)) {
1449 /* DAD failed for link-local based on MAC address */
1450 idev->cnf.disable_ipv6 = 1;
1452 printk(KERN_INFO "%s: IPv6 being disabled!\n",
1453 ifp->idev->dev->name);
1457 addrconf_dad_stop(ifp, 1);
1460 /* Join to solicited addr multicast group. */
1462 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1464 struct in6_addr maddr;
1466 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1469 addrconf_addr_solict_mult(addr, &maddr);
1470 ipv6_dev_mc_inc(dev, &maddr);
1473 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1475 struct in6_addr maddr;
1477 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1480 addrconf_addr_solict_mult(addr, &maddr);
1481 __ipv6_dev_mc_dec(idev, &maddr);
1484 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1486 struct in6_addr addr;
1487 if (ifp->prefix_len == 127) /* RFC 6164 */
1489 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1490 if (ipv6_addr_any(&addr))
1492 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1495 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1497 struct in6_addr addr;
1498 if (ifp->prefix_len == 127) /* RFC 6164 */
1500 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1501 if (ipv6_addr_any(&addr))
1503 __ipv6_dev_ac_dec(ifp->idev, &addr);
1506 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1508 if (dev->addr_len != ETH_ALEN)
1510 memcpy(eui, dev->dev_addr, 3);
1511 memcpy(eui + 5, dev->dev_addr + 3, 3);
1514 * The zSeries OSA network cards can be shared among various
1515 * OS instances, but the OSA cards have only one MAC address.
1516 * This leads to duplicate address conflicts in conjunction
1517 * with IPv6 if more than one instance uses the same card.
1519 * The driver for these cards can deliver a unique 16-bit
1520 * identifier for each instance sharing the same card. It is
1521 * placed instead of 0xFFFE in the interface identifier. The
1522 * "u" bit of the interface identifier is not inverted in this
1523 * case. Hence the resulting interface identifier has local
1524 * scope according to RFC2373.
1527 eui[3] = (dev->dev_id >> 8) & 0xFF;
1528 eui[4] = dev->dev_id & 0xFF;
1537 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1539 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1540 if (dev->addr_len != ARCNET_ALEN)
1543 eui[7] = *(u8*)dev->dev_addr;
1547 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1549 if (dev->addr_len != INFINIBAND_ALEN)
1551 memcpy(eui, dev->dev_addr + 12, 8);
1556 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1560 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1561 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1562 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1563 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1564 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1565 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1569 memcpy(eui + 4, &addr, 4);
1573 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1575 if (dev->priv_flags & IFF_ISATAP)
1576 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1580 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1582 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1585 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1587 switch (dev->type) {
1590 case ARPHRD_IEEE802_TR:
1591 return addrconf_ifid_eui48(eui, dev);
1593 return addrconf_ifid_arcnet(eui, dev);
1594 case ARPHRD_INFINIBAND:
1595 return addrconf_ifid_infiniband(eui, dev);
1597 return addrconf_ifid_sit(eui, dev);
1599 return addrconf_ifid_gre(eui, dev);
1604 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1607 struct inet6_ifaddr *ifp;
1609 read_lock_bh(&idev->lock);
1610 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1611 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1612 memcpy(eui, ifp->addr.s6_addr+8, 8);
1617 read_unlock_bh(&idev->lock);
1621 #ifdef CONFIG_IPV6_PRIVACY
1622 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1623 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1626 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1627 idev->rndid[0] &= ~0x02;
1630 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1631 * check if generated address is not inappropriate
1633 * - Reserved subnet anycast (RFC 2526)
1634 * 11111101 11....11 1xxxxxxx
1635 * - ISATAP (RFC4214) 6.1
1636 * 00-00-5E-FE-xx-xx-xx-xx
1638 * - XXX: already assigned to an address on the device
1640 if (idev->rndid[0] == 0xfd &&
1641 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1642 (idev->rndid[7]&0x80))
1644 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1645 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1647 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1654 static void ipv6_regen_rndid(unsigned long data)
1656 struct inet6_dev *idev = (struct inet6_dev *) data;
1657 unsigned long expires;
1660 write_lock_bh(&idev->lock);
1665 if (__ipv6_regen_rndid(idev) < 0)
1669 idev->cnf.temp_prefered_lft * HZ -
1670 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1671 idev->cnf.max_desync_factor * HZ;
1672 if (time_before(expires, jiffies)) {
1674 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1679 if (!mod_timer(&idev->regen_timer, expires))
1683 write_unlock_bh(&idev->lock);
1684 rcu_read_unlock_bh();
1688 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1691 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1692 ret = __ipv6_regen_rndid(idev);
1702 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1703 unsigned long expires, u32 flags)
1705 struct fib6_config cfg = {
1706 .fc_table = RT6_TABLE_PREFIX,
1707 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1708 .fc_ifindex = dev->ifindex,
1709 .fc_expires = expires,
1711 .fc_flags = RTF_UP | flags,
1712 .fc_nlinfo.nl_net = dev_net(dev),
1713 .fc_protocol = RTPROT_KERNEL,
1716 ipv6_addr_copy(&cfg.fc_dst, pfx);
1718 /* Prevent useless cloning on PtP SIT.
1719 This thing is done here expecting that the whole
1720 class of non-broadcast devices need not cloning.
1722 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1723 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1724 cfg.fc_flags |= RTF_NONEXTHOP;
1727 ip6_route_add(&cfg);
1731 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
1733 const struct net_device *dev,
1734 u32 flags, u32 noflags)
1736 struct fib6_node *fn;
1737 struct rt6_info *rt = NULL;
1738 struct fib6_table *table;
1740 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
1744 write_lock_bh(&table->tb6_lock);
1745 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
1748 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1749 if (rt->rt6i_dev->ifindex != dev->ifindex)
1751 if ((rt->rt6i_flags & flags) != flags)
1753 if ((rt->rt6i_flags & noflags) != 0)
1759 write_unlock_bh(&table->tb6_lock);
1764 /* Create "default" multicast route to the interface */
1766 static void addrconf_add_mroute(struct net_device *dev)
1768 struct fib6_config cfg = {
1769 .fc_table = RT6_TABLE_LOCAL,
1770 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1771 .fc_ifindex = dev->ifindex,
1774 .fc_nlinfo.nl_net = dev_net(dev),
1777 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1779 ip6_route_add(&cfg);
1782 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1783 static void sit_route_add(struct net_device *dev)
1785 struct fib6_config cfg = {
1786 .fc_table = RT6_TABLE_MAIN,
1787 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1788 .fc_ifindex = dev->ifindex,
1790 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1791 .fc_nlinfo.nl_net = dev_net(dev),
1794 /* prefix length - 96 bits "::d.d.d.d" */
1795 ip6_route_add(&cfg);
1799 static void addrconf_add_lroute(struct net_device *dev)
1801 struct in6_addr addr;
1803 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1804 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1807 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1809 struct inet6_dev *idev;
1813 idev = ipv6_find_idev(dev);
1815 return ERR_PTR(-ENOBUFS);
1817 if (idev->cnf.disable_ipv6)
1818 return ERR_PTR(-EACCES);
1820 /* Add default multicast route */
1821 if (!(dev->flags & IFF_LOOPBACK))
1822 addrconf_add_mroute(dev);
1824 /* Add link local route */
1825 addrconf_add_lroute(dev);
1829 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1831 struct prefix_info *pinfo;
1835 struct inet6_dev *in6_dev;
1836 struct net *net = dev_net(dev);
1838 pinfo = (struct prefix_info *) opt;
1840 if (len < sizeof(struct prefix_info)) {
1841 ADBG(("addrconf: prefix option too short\n"));
1846 * Validation checks ([ADDRCONF], page 19)
1849 addr_type = ipv6_addr_type(&pinfo->prefix);
1851 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1854 valid_lft = ntohl(pinfo->valid);
1855 prefered_lft = ntohl(pinfo->prefered);
1857 if (prefered_lft > valid_lft) {
1858 if (net_ratelimit())
1859 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1863 in6_dev = in6_dev_get(dev);
1865 if (in6_dev == NULL) {
1866 if (net_ratelimit())
1867 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1872 * Two things going on here:
1873 * 1) Add routes for on-link prefixes
1874 * 2) Configure prefixes with the auto flag set
1877 if (pinfo->onlink) {
1878 struct rt6_info *rt;
1879 unsigned long rt_expires;
1881 /* Avoid arithmetic overflow. Really, we could
1882 * save rt_expires in seconds, likely valid_lft,
1883 * but it would require division in fib gc, that it
1887 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1889 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
1891 if (addrconf_finite_timeout(rt_expires))
1894 rt = addrconf_get_prefix_route(&pinfo->prefix,
1897 RTF_ADDRCONF | RTF_PREFIX_RT,
1898 RTF_GATEWAY | RTF_DEFAULT);
1901 /* Autoconf prefix route */
1902 if (valid_lft == 0) {
1905 } else if (addrconf_finite_timeout(rt_expires)) {
1907 rt->rt6i_expires = jiffies + rt_expires;
1908 rt->rt6i_flags |= RTF_EXPIRES;
1910 rt->rt6i_flags &= ~RTF_EXPIRES;
1911 rt->rt6i_expires = 0;
1913 } else if (valid_lft) {
1914 clock_t expires = 0;
1915 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1916 if (addrconf_finite_timeout(rt_expires)) {
1918 flags |= RTF_EXPIRES;
1919 expires = jiffies_to_clock_t(rt_expires);
1921 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1922 dev, expires, flags);
1925 dst_release(&rt->dst);
1928 /* Try to figure out our local address for this prefix */
1930 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1931 struct inet6_ifaddr * ifp;
1932 struct in6_addr addr;
1933 int create = 0, update_lft = 0;
1935 if (pinfo->prefix_len == 64) {
1936 memcpy(&addr, &pinfo->prefix, 8);
1937 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1938 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1939 in6_dev_put(in6_dev);
1944 if (net_ratelimit())
1945 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1947 in6_dev_put(in6_dev);
1952 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1954 if (ifp == NULL && valid_lft) {
1955 int max_addresses = in6_dev->cnf.max_addresses;
1958 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1959 if (in6_dev->cnf.optimistic_dad &&
1960 !net->ipv6.devconf_all->forwarding)
1961 addr_flags = IFA_F_OPTIMISTIC;
1964 /* Do not allow to create too much of autoconfigured
1965 * addresses; this would be too easy way to crash kernel.
1967 if (!max_addresses ||
1968 ipv6_count_addresses(in6_dev) < max_addresses)
1969 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1970 addr_type&IPV6_ADDR_SCOPE_MASK,
1973 if (!ifp || IS_ERR(ifp)) {
1974 in6_dev_put(in6_dev);
1978 update_lft = create = 1;
1979 ifp->cstamp = jiffies;
1980 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1986 #ifdef CONFIG_IPV6_PRIVACY
1987 struct inet6_ifaddr *ift;
1991 /* update lifetime (RFC2462 5.5.3 e) */
1992 spin_lock(&ifp->lock);
1994 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1995 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1998 if (!update_lft && stored_lft) {
1999 if (valid_lft > MIN_VALID_LIFETIME ||
2000 valid_lft > stored_lft)
2002 else if (stored_lft <= MIN_VALID_LIFETIME) {
2003 /* valid_lft <= stored_lft is always true */
2005 * RFC 4862 Section 5.5.3e:
2006 * "Note that the preferred lifetime of
2007 * the corresponding address is always
2008 * reset to the Preferred Lifetime in
2009 * the received Prefix Information
2010 * option, regardless of whether the
2011 * valid lifetime is also reset or
2014 * So if the preferred lifetime in
2015 * this advertisement is different
2016 * than what we have stored, but the
2017 * valid lifetime is invalid, just
2018 * reset prefered_lft.
2020 * We must set the valid lifetime
2021 * to the stored lifetime since we'll
2022 * be updating the timestamp below,
2023 * else we'll set it back to the
2026 if (prefered_lft != ifp->prefered_lft) {
2027 valid_lft = stored_lft;
2031 valid_lft = MIN_VALID_LIFETIME;
2032 if (valid_lft < prefered_lft)
2033 prefered_lft = valid_lft;
2039 ifp->valid_lft = valid_lft;
2040 ifp->prefered_lft = prefered_lft;
2043 ifp->flags &= ~IFA_F_DEPRECATED;
2044 spin_unlock(&ifp->lock);
2046 if (!(flags&IFA_F_TENTATIVE))
2047 ipv6_ifa_notify(0, ifp);
2049 spin_unlock(&ifp->lock);
2051 #ifdef CONFIG_IPV6_PRIVACY
2052 read_lock_bh(&in6_dev->lock);
2053 /* update all temporary addresses in the list */
2054 list_for_each_entry(ift, &in6_dev->tempaddr_list,
2056 int age, max_valid, max_prefered;
2058 if (ifp != ift->ifpub)
2062 * RFC 4941 section 3.3:
2063 * If a received option will extend the lifetime
2064 * of a public address, the lifetimes of
2065 * temporary addresses should be extended,
2066 * subject to the overall constraint that no
2067 * temporary addresses should ever remain
2068 * "valid" or "preferred" for a time longer than
2069 * (TEMP_VALID_LIFETIME) or
2070 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR),
2073 age = (now - ift->cstamp) / HZ;
2074 max_valid = in6_dev->cnf.temp_valid_lft - age;
2078 max_prefered = in6_dev->cnf.temp_prefered_lft -
2079 in6_dev->cnf.max_desync_factor -
2081 if (max_prefered < 0)
2084 if (valid_lft > max_valid)
2085 valid_lft = max_valid;
2087 if (prefered_lft > max_prefered)
2088 prefered_lft = max_prefered;
2090 spin_lock(&ift->lock);
2092 ift->valid_lft = valid_lft;
2093 ift->prefered_lft = prefered_lft;
2095 if (prefered_lft > 0)
2096 ift->flags &= ~IFA_F_DEPRECATED;
2098 spin_unlock(&ift->lock);
2099 if (!(flags&IFA_F_TENTATIVE))
2100 ipv6_ifa_notify(0, ift);
2103 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
2105 * When a new public address is created as
2106 * described in [ADDRCONF], also create a new
2107 * temporary address. Also create a temporary
2108 * address if it's enabled but no temporary
2109 * address currently exists.
2111 read_unlock_bh(&in6_dev->lock);
2112 ipv6_create_tempaddr(ifp, NULL);
2114 read_unlock_bh(&in6_dev->lock);
2121 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2122 in6_dev_put(in6_dev);
2126 * Set destination address.
2127 * Special case for SIT interfaces where we create a new "virtual"
2130 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2132 struct in6_ifreq ireq;
2133 struct net_device *dev;
2139 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2142 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2148 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2149 if (dev->type == ARPHRD_SIT) {
2150 const struct net_device_ops *ops = dev->netdev_ops;
2152 struct ip_tunnel_parm p;
2154 err = -EADDRNOTAVAIL;
2155 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2158 memset(&p, 0, sizeof(p));
2159 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2163 p.iph.protocol = IPPROTO_IPV6;
2165 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2167 if (ops->ndo_do_ioctl) {
2168 mm_segment_t oldfs = get_fs();
2171 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2178 dev = __dev_get_by_name(net, p.name);
2181 err = dev_open(dev);
2192 * Manual configuration of address on an interface
2194 static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx,
2195 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2198 struct inet6_ifaddr *ifp;
2199 struct inet6_dev *idev;
2200 struct net_device *dev;
2204 unsigned long timeout;
2211 /* check the lifetime */
2212 if (!valid_lft || prefered_lft > valid_lft)
2215 dev = __dev_get_by_index(net, ifindex);
2219 idev = addrconf_add_dev(dev);
2221 return PTR_ERR(idev);
2223 scope = ipv6_addr_scope(pfx);
2225 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2226 if (addrconf_finite_timeout(timeout)) {
2227 expires = jiffies_to_clock_t(timeout * HZ);
2228 valid_lft = timeout;
2229 flags = RTF_EXPIRES;
2233 ifa_flags |= IFA_F_PERMANENT;
2236 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2237 if (addrconf_finite_timeout(timeout)) {
2239 ifa_flags |= IFA_F_DEPRECATED;
2240 prefered_lft = timeout;
2243 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2246 spin_lock_bh(&ifp->lock);
2247 ifp->valid_lft = valid_lft;
2248 ifp->prefered_lft = prefered_lft;
2249 ifp->tstamp = jiffies;
2250 spin_unlock_bh(&ifp->lock);
2252 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2255 * Note that section 3.1 of RFC 4429 indicates
2256 * that the Optimistic flag should not be set for
2257 * manually configured addresses
2259 addrconf_dad_start(ifp, 0);
2265 return PTR_ERR(ifp);
2268 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
2271 struct inet6_ifaddr *ifp;
2272 struct inet6_dev *idev;
2273 struct net_device *dev;
2278 dev = __dev_get_by_index(net, ifindex);
2282 if ((idev = __in6_dev_get(dev)) == NULL)
2285 read_lock_bh(&idev->lock);
2286 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2287 if (ifp->prefix_len == plen &&
2288 ipv6_addr_equal(pfx, &ifp->addr)) {
2290 read_unlock_bh(&idev->lock);
2294 /* If the last address is deleted administratively,
2295 disable IPv6 on this interface.
2297 if (list_empty(&idev->addr_list))
2298 addrconf_ifdown(idev->dev, 1);
2302 read_unlock_bh(&idev->lock);
2303 return -EADDRNOTAVAIL;
2307 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2309 struct in6_ifreq ireq;
2312 if (!capable(CAP_NET_ADMIN))
2315 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2319 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2320 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2321 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2326 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2328 struct in6_ifreq ireq;
2331 if (!capable(CAP_NET_ADMIN))
2334 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2338 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2339 ireq.ifr6_prefixlen);
2344 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2345 int plen, int scope)
2347 struct inet6_ifaddr *ifp;
2349 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2351 spin_lock_bh(&ifp->lock);
2352 ifp->flags &= ~IFA_F_TENTATIVE;
2353 spin_unlock_bh(&ifp->lock);
2354 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2359 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2360 static void sit_add_v4_addrs(struct inet6_dev *idev)
2362 struct in6_addr addr;
2363 struct net_device *dev;
2364 struct net *net = dev_net(idev->dev);
2369 memset(&addr, 0, sizeof(struct in6_addr));
2370 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2372 if (idev->dev->flags&IFF_POINTOPOINT) {
2373 addr.s6_addr32[0] = htonl(0xfe800000);
2376 scope = IPV6_ADDR_COMPATv4;
2379 if (addr.s6_addr32[3]) {
2380 add_addr(idev, &addr, 128, scope);
2384 for_each_netdev(net, dev) {
2385 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2386 if (in_dev && (dev->flags & IFF_UP)) {
2387 struct in_ifaddr * ifa;
2391 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2394 addr.s6_addr32[3] = ifa->ifa_local;
2396 if (ifa->ifa_scope == RT_SCOPE_LINK)
2398 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2399 if (idev->dev->flags&IFF_POINTOPOINT)
2403 if (idev->dev->flags&IFF_POINTOPOINT)
2408 add_addr(idev, &addr, plen, flag);
2415 static void init_loopback(struct net_device *dev)
2417 struct inet6_dev *idev;
2418 struct net_device *sp_dev;
2419 struct inet6_ifaddr *sp_ifa;
2420 struct rt6_info *sp_rt;
2426 if ((idev = ipv6_find_idev(dev)) == NULL) {
2427 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2431 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2433 /* Add routes to other interface's IPv6 addresses */
2434 for_each_netdev(dev_net(dev), sp_dev) {
2435 if (!strcmp(sp_dev->name, dev->name))
2438 idev = __in6_dev_get(sp_dev);
2442 read_lock_bh(&idev->lock);
2443 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2445 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2449 /* This dst has been added to garbage list when
2450 * lo device down, release this obsolete dst and
2451 * reallocate a new router for ifa.
2453 if (sp_ifa->rt->dst.obsolete > 0) {
2454 dst_release(&sp_ifa->rt->dst);
2461 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, 0);
2463 /* Failure cases are ignored */
2464 if (!IS_ERR(sp_rt)) {
2469 read_unlock_bh(&idev->lock);
2473 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
2475 struct inet6_ifaddr * ifp;
2476 u32 addr_flags = IFA_F_PERMANENT;
2478 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2479 if (idev->cnf.optimistic_dad &&
2480 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2481 addr_flags |= IFA_F_OPTIMISTIC;
2485 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2487 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2488 addrconf_dad_start(ifp, 0);
2493 static void addrconf_dev_config(struct net_device *dev)
2495 struct in6_addr addr;
2496 struct inet6_dev * idev;
2500 if ((dev->type != ARPHRD_ETHER) &&
2501 (dev->type != ARPHRD_FDDI) &&
2502 (dev->type != ARPHRD_IEEE802_TR) &&
2503 (dev->type != ARPHRD_ARCNET) &&
2504 (dev->type != ARPHRD_INFINIBAND)) {
2505 /* Alas, we support only Ethernet autoconfiguration. */
2509 idev = addrconf_add_dev(dev);
2513 memset(&addr, 0, sizeof(struct in6_addr));
2514 addr.s6_addr32[0] = htonl(0xFE800000);
2516 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2517 addrconf_add_linklocal(idev, &addr);
2520 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2521 static void addrconf_sit_config(struct net_device *dev)
2523 struct inet6_dev *idev;
2528 * Configure the tunnel with one of our IPv4
2529 * addresses... we should configure all of
2530 * our v4 addrs in the tunnel
2533 if ((idev = ipv6_find_idev(dev)) == NULL) {
2534 printk(KERN_DEBUG "init sit: add_dev failed\n");
2538 if (dev->priv_flags & IFF_ISATAP) {
2539 struct in6_addr addr;
2541 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2542 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2543 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2544 addrconf_add_linklocal(idev, &addr);
2548 sit_add_v4_addrs(idev);
2550 if (dev->flags&IFF_POINTOPOINT) {
2551 addrconf_add_mroute(dev);
2552 addrconf_add_lroute(dev);
2558 #if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE)
2559 static void addrconf_gre_config(struct net_device *dev)
2561 struct inet6_dev *idev;
2562 struct in6_addr addr;
2564 pr_info("ipv6: addrconf_gre_config(%s)\n", dev->name);
2568 if ((idev = ipv6_find_idev(dev)) == NULL) {
2569 printk(KERN_DEBUG "init gre: add_dev failed\n");
2573 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2574 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2576 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2577 addrconf_add_linklocal(idev, &addr);
2582 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2584 struct in6_addr lladdr;
2586 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2587 addrconf_add_linklocal(idev, &lladdr);
2593 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2595 struct net_device *link_dev;
2596 struct net *net = dev_net(idev->dev);
2598 /* first try to inherit the link-local address from the link device */
2599 if (idev->dev->iflink &&
2600 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2601 if (!ipv6_inherit_linklocal(idev, link_dev))
2604 /* then try to inherit it from any device */
2605 for_each_netdev(net, link_dev) {
2606 if (!ipv6_inherit_linklocal(idev, link_dev))
2609 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2613 * Autoconfigure tunnel with a link-local address so routing protocols,
2614 * DHCPv6, MLD etc. can be run over the virtual link
2617 static void addrconf_ip6_tnl_config(struct net_device *dev)
2619 struct inet6_dev *idev;
2623 idev = addrconf_add_dev(dev);
2625 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2628 ip6_tnl_add_linklocal(idev);
2631 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2634 struct net_device *dev = (struct net_device *) data;
2635 struct inet6_dev *idev = __in6_dev_get(dev);
2636 struct net *net = dev_net(dev);
2637 int run_pending = 0;
2641 case NETDEV_REGISTER:
2642 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2643 idev = ipv6_add_dev(dev);
2645 return notifier_from_errno(-ENOMEM);
2651 if (dev->flags & IFF_SLAVE)
2654 if (event == NETDEV_UP) {
2655 if (!addrconf_qdisc_ok(dev)) {
2656 /* device is not ready yet. */
2658 "ADDRCONF(NETDEV_UP): %s: "
2659 "link is not ready\n",
2664 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2665 idev = ipv6_add_dev(dev);
2668 idev->if_flags |= IF_READY;
2672 if (!addrconf_qdisc_ok(dev)) {
2673 /* device is still not ready. */
2678 if (idev->if_flags & IF_READY)
2679 /* device is already configured. */
2681 idev->if_flags |= IF_READY;
2685 "ADDRCONF(NETDEV_CHANGE): %s: "
2686 "link becomes ready\n",
2692 switch (dev->type) {
2693 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2695 addrconf_sit_config(dev);
2698 #if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE)
2700 addrconf_gre_config(dev);
2703 case ARPHRD_TUNNEL6:
2704 addrconf_ip6_tnl_config(dev);
2706 case ARPHRD_LOOPBACK:
2711 addrconf_dev_config(dev);
2717 addrconf_dad_run(idev);
2720 * If the MTU changed during the interface down,
2721 * when the interface up, the changed MTU must be
2722 * reflected in the idev as well as routers.
2724 if (idev->cnf.mtu6 != dev->mtu &&
2725 dev->mtu >= IPV6_MIN_MTU) {
2726 rt6_mtu_change(dev, dev->mtu);
2727 idev->cnf.mtu6 = dev->mtu;
2729 idev->tstamp = jiffies;
2730 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2733 * If the changed mtu during down is lower than
2734 * IPV6_MIN_MTU stop IPv6 on this interface.
2736 if (dev->mtu < IPV6_MIN_MTU)
2737 addrconf_ifdown(dev, dev != net->loopback_dev);
2741 case NETDEV_CHANGEMTU:
2742 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2743 rt6_mtu_change(dev, dev->mtu);
2744 idev->cnf.mtu6 = dev->mtu;
2748 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2749 idev = ipv6_add_dev(dev);
2755 * MTU falled under IPV6_MIN_MTU.
2756 * Stop IPv6 on this interface.
2758 addrconf_ifdown(dev, dev != net->loopback_dev);
2762 case NETDEV_UNREGISTER:
2764 * Remove all addresses from this interface.
2766 addrconf_ifdown(dev, event != NETDEV_DOWN);
2769 case NETDEV_CHANGENAME:
2771 snmp6_unregister_dev(idev);
2772 addrconf_sysctl_unregister(idev);
2773 addrconf_sysctl_register(idev);
2774 err = snmp6_register_dev(idev);
2776 return notifier_from_errno(err);
2780 case NETDEV_PRE_TYPE_CHANGE:
2781 case NETDEV_POST_TYPE_CHANGE:
2782 addrconf_type_change(dev, event);
2790 * addrconf module should be notified of a device going up
2792 static struct notifier_block ipv6_dev_notf = {
2793 .notifier_call = addrconf_notify,
2796 static void addrconf_type_change(struct net_device *dev, unsigned long event)
2798 struct inet6_dev *idev;
2801 idev = __in6_dev_get(dev);
2803 if (event == NETDEV_POST_TYPE_CHANGE)
2804 ipv6_mc_remap(idev);
2805 else if (event == NETDEV_PRE_TYPE_CHANGE)
2806 ipv6_mc_unmap(idev);
2809 static int addrconf_ifdown(struct net_device *dev, int how)
2811 struct net *net = dev_net(dev);
2812 struct inet6_dev *idev;
2813 struct inet6_ifaddr *ifa;
2818 rt6_ifdown(net, dev);
2819 neigh_ifdown(&nd_tbl, dev);
2821 idev = __in6_dev_get(dev);
2826 * Step 1: remove reference to ipv6 device from parent device.
2832 /* protected by rtnl_lock */
2833 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
2835 /* Step 1.5: remove snmp6 entry */
2836 snmp6_unregister_dev(idev);
2840 /* Step 2: clear hash table */
2841 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
2842 struct hlist_head *h = &inet6_addr_lst[i];
2843 struct hlist_node *n;
2845 spin_lock_bh(&addrconf_hash_lock);
2847 hlist_for_each_entry_rcu(ifa, n, h, addr_lst) {
2848 if (ifa->idev == idev) {
2849 hlist_del_init_rcu(&ifa->addr_lst);
2850 addrconf_del_timer(ifa);
2854 spin_unlock_bh(&addrconf_hash_lock);
2857 write_lock_bh(&idev->lock);
2859 /* Step 2: clear flags for stateless addrconf */
2861 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2863 #ifdef CONFIG_IPV6_PRIVACY
2864 if (how && del_timer(&idev->regen_timer))
2867 /* Step 3: clear tempaddr list */
2868 while (!list_empty(&idev->tempaddr_list)) {
2869 ifa = list_first_entry(&idev->tempaddr_list,
2870 struct inet6_ifaddr, tmp_list);
2871 list_del(&ifa->tmp_list);
2872 write_unlock_bh(&idev->lock);
2873 spin_lock_bh(&ifa->lock);
2876 in6_ifa_put(ifa->ifpub);
2879 spin_unlock_bh(&ifa->lock);
2881 write_lock_bh(&idev->lock);
2885 while (!list_empty(&idev->addr_list)) {
2886 ifa = list_first_entry(&idev->addr_list,
2887 struct inet6_ifaddr, if_list);
2888 addrconf_del_timer(ifa);
2890 list_del(&ifa->if_list);
2892 write_unlock_bh(&idev->lock);
2894 spin_lock_bh(&ifa->state_lock);
2896 ifa->state = INET6_IFADDR_STATE_DEAD;
2897 spin_unlock_bh(&ifa->state_lock);
2899 if (state != INET6_IFADDR_STATE_DEAD) {
2900 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2901 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2905 write_lock_bh(&idev->lock);
2908 write_unlock_bh(&idev->lock);
2910 /* Step 5: Discard multicast list */
2912 ipv6_mc_destroy_dev(idev);
2916 idev->tstamp = jiffies;
2918 /* Last: Shot the device (if unregistered) */
2920 addrconf_sysctl_unregister(idev);
2921 neigh_parms_release(&nd_tbl, idev->nd_parms);
2922 neigh_ifdown(&nd_tbl, dev);
2928 static void addrconf_rs_timer(unsigned long data)
2930 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2931 struct inet6_dev *idev = ifp->idev;
2933 read_lock(&idev->lock);
2934 if (idev->dead || !(idev->if_flags & IF_READY))
2937 if (idev->cnf.forwarding)
2940 /* Announcement received after solicitation was sent */
2941 if (idev->if_flags & IF_RA_RCVD)
2944 spin_lock(&ifp->lock);
2945 if (ifp->probes++ < idev->cnf.rtr_solicits) {
2946 /* The wait after the last probe can be shorter */
2947 addrconf_mod_timer(ifp, AC_RS,
2948 (ifp->probes == idev->cnf.rtr_solicits) ?
2949 idev->cnf.rtr_solicit_delay :
2950 idev->cnf.rtr_solicit_interval);
2951 spin_unlock(&ifp->lock);
2953 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2955 spin_unlock(&ifp->lock);
2957 * Note: we do not support deprecated "all on-link"
2958 * assumption any longer.
2960 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2965 read_unlock(&idev->lock);
2970 * Duplicate Address Detection
2972 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2974 unsigned long rand_num;
2975 struct inet6_dev *idev = ifp->idev;
2977 if (ifp->flags & IFA_F_OPTIMISTIC)
2980 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2982 ifp->probes = idev->cnf.dad_transmits;
2983 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2986 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2988 struct inet6_dev *idev = ifp->idev;
2989 struct net_device *dev = idev->dev;
2991 addrconf_join_solict(dev, &ifp->addr);
2993 net_srandom(ifp->addr.s6_addr32[3]);
2995 read_lock_bh(&idev->lock);
2996 spin_lock(&ifp->lock);
2997 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3000 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3001 idev->cnf.accept_dad < 1 ||
3002 !(ifp->flags&IFA_F_TENTATIVE) ||
3003 ifp->flags & IFA_F_NODAD) {
3004 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3005 spin_unlock(&ifp->lock);
3006 read_unlock_bh(&idev->lock);
3008 addrconf_dad_completed(ifp);
3012 if (!(idev->if_flags & IF_READY)) {
3013 spin_unlock(&ifp->lock);
3014 read_unlock_bh(&idev->lock);
3016 * If the device is not ready:
3017 * - keep it tentative if it is a permanent address.
3018 * - otherwise, kill it.
3021 addrconf_dad_stop(ifp, 0);
3026 * Optimistic nodes can start receiving
3029 if (ifp->flags & IFA_F_OPTIMISTIC)
3030 ip6_ins_rt(ifp->rt);
3032 addrconf_dad_kick(ifp);
3034 spin_unlock(&ifp->lock);
3035 read_unlock_bh(&idev->lock);
3038 static void addrconf_dad_timer(unsigned long data)
3040 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
3041 struct inet6_dev *idev = ifp->idev;
3042 struct in6_addr mcaddr;
3044 if (!ifp->probes && addrconf_dad_end(ifp))
3047 read_lock(&idev->lock);
3048 if (idev->dead || !(idev->if_flags & IF_READY)) {
3049 read_unlock(&idev->lock);
3053 spin_lock(&ifp->lock);
3054 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3055 spin_unlock(&ifp->lock);
3056 read_unlock(&idev->lock);
3060 if (ifp->probes == 0) {
3062 * DAD was successful
3065 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3066 spin_unlock(&ifp->lock);
3067 read_unlock(&idev->lock);
3069 addrconf_dad_completed(ifp);
3075 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
3076 spin_unlock(&ifp->lock);
3077 read_unlock(&idev->lock);
3079 /* send a neighbour solicitation for our addr */
3080 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3081 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
3086 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3088 struct net_device *dev = ifp->idev->dev;
3091 * Configure the address for reception. Now it is valid.
3094 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3096 /* If added prefix is link local and we are prepared to process
3097 router advertisements, start sending router solicitations.
3100 if (((ifp->idev->cnf.accept_ra == 1 && !ifp->idev->cnf.forwarding) ||
3101 ifp->idev->cnf.accept_ra == 2) &&
3102 ifp->idev->cnf.rtr_solicits > 0 &&
3103 (dev->flags&IFF_LOOPBACK) == 0 &&
3104 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
3106 * If a host as already performed a random delay
3107 * [...] as part of DAD [...] there is no need
3108 * to delay again before sending the first RS
3110 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
3112 spin_lock_bh(&ifp->lock);
3114 ifp->idev->if_flags |= IF_RS_SENT;
3115 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
3116 spin_unlock_bh(&ifp->lock);
3120 static void addrconf_dad_run(struct inet6_dev *idev)
3122 struct inet6_ifaddr *ifp;
3124 read_lock_bh(&idev->lock);
3125 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3126 spin_lock(&ifp->lock);
3127 if (ifp->flags & IFA_F_TENTATIVE &&
3128 ifp->state == INET6_IFADDR_STATE_DAD)
3129 addrconf_dad_kick(ifp);
3130 spin_unlock(&ifp->lock);
3132 read_unlock_bh(&idev->lock);
3135 #ifdef CONFIG_PROC_FS
3136 struct if6_iter_state {
3137 struct seq_net_private p;
3141 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
3143 struct inet6_ifaddr *ifa = NULL;
3144 struct if6_iter_state *state = seq->private;
3145 struct net *net = seq_file_net(seq);
3147 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3148 struct hlist_node *n;
3149 hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket],
3151 if (net_eq(dev_net(ifa->idev->dev), net))
3157 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3158 struct inet6_ifaddr *ifa)
3160 struct if6_iter_state *state = seq->private;
3161 struct net *net = seq_file_net(seq);
3162 struct hlist_node *n = &ifa->addr_lst;
3164 hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst)
3165 if (net_eq(dev_net(ifa->idev->dev), net))
3168 while (++state->bucket < IN6_ADDR_HSIZE) {
3169 hlist_for_each_entry_rcu_bh(ifa, n,
3170 &inet6_addr_lst[state->bucket], addr_lst) {
3171 if (net_eq(dev_net(ifa->idev->dev), net))
3179 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
3181 struct inet6_ifaddr *ifa = if6_get_first(seq);
3184 while (pos && (ifa = if6_get_next(seq, ifa)) != NULL)
3186 return pos ? NULL : ifa;
3189 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3193 return if6_get_idx(seq, *pos);
3196 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3198 struct inet6_ifaddr *ifa;
3200 ifa = if6_get_next(seq, v);
3205 static void if6_seq_stop(struct seq_file *seq, void *v)
3208 rcu_read_unlock_bh();
3211 static int if6_seq_show(struct seq_file *seq, void *v)
3213 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3214 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3216 ifp->idev->dev->ifindex,
3220 ifp->idev->dev->name);
3224 static const struct seq_operations if6_seq_ops = {
3225 .start = if6_seq_start,
3226 .next = if6_seq_next,
3227 .show = if6_seq_show,
3228 .stop = if6_seq_stop,
3231 static int if6_seq_open(struct inode *inode, struct file *file)
3233 return seq_open_net(inode, file, &if6_seq_ops,
3234 sizeof(struct if6_iter_state));
3237 static const struct file_operations if6_fops = {
3238 .owner = THIS_MODULE,
3239 .open = if6_seq_open,
3241 .llseek = seq_lseek,
3242 .release = seq_release_net,
3245 static int __net_init if6_proc_net_init(struct net *net)
3247 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
3252 static void __net_exit if6_proc_net_exit(struct net *net)
3254 proc_net_remove(net, "if_inet6");
3257 static struct pernet_operations if6_proc_net_ops = {
3258 .init = if6_proc_net_init,
3259 .exit = if6_proc_net_exit,
3262 int __init if6_proc_init(void)
3264 return register_pernet_subsys(&if6_proc_net_ops);
3267 void if6_proc_exit(void)
3269 unregister_pernet_subsys(&if6_proc_net_ops);
3271 #endif /* CONFIG_PROC_FS */
3273 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3274 /* Check if address is a home address configured on any interface. */
3275 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3278 struct inet6_ifaddr *ifp = NULL;
3279 struct hlist_node *n;
3280 unsigned int hash = ipv6_addr_hash(addr);
3283 hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) {
3284 if (!net_eq(dev_net(ifp->idev->dev), net))
3286 if (ipv6_addr_equal(&ifp->addr, addr) &&
3287 (ifp->flags & IFA_F_HOMEADDRESS)) {
3292 rcu_read_unlock_bh();
3298 * Periodic address status verification
3301 static void addrconf_verify(unsigned long foo)
3303 unsigned long now, next, next_sec, next_sched;
3304 struct inet6_ifaddr *ifp;
3305 struct hlist_node *node;
3309 spin_lock(&addrconf_verify_lock);
3311 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3313 del_timer(&addr_chk_timer);
3315 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3317 hlist_for_each_entry_rcu_bh(ifp, node,
3318 &inet6_addr_lst[i], addr_lst) {
3321 if (ifp->flags & IFA_F_PERMANENT)
3324 spin_lock(&ifp->lock);
3325 /* We try to batch several events at once. */
3326 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3328 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3329 age >= ifp->valid_lft) {
3330 spin_unlock(&ifp->lock);
3334 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3335 spin_unlock(&ifp->lock);
3337 } else if (age >= ifp->prefered_lft) {
3338 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3341 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3343 ifp->flags |= IFA_F_DEPRECATED;
3346 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3347 next = ifp->tstamp + ifp->valid_lft * HZ;
3349 spin_unlock(&ifp->lock);
3354 ipv6_ifa_notify(0, ifp);
3358 #ifdef CONFIG_IPV6_PRIVACY
3359 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3360 !(ifp->flags&IFA_F_TENTATIVE)) {
3361 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3362 ifp->idev->cnf.dad_transmits *
3363 ifp->idev->nd_parms->retrans_time / HZ;
3365 if (age >= ifp->prefered_lft - regen_advance) {
3366 struct inet6_ifaddr *ifpub = ifp->ifpub;
3367 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3368 next = ifp->tstamp + ifp->prefered_lft * HZ;
3369 if (!ifp->regen_count && ifpub) {
3372 in6_ifa_hold(ifpub);
3373 spin_unlock(&ifp->lock);
3375 spin_lock(&ifpub->lock);
3376 ifpub->regen_count = 0;
3377 spin_unlock(&ifpub->lock);
3378 ipv6_create_tempaddr(ifpub, ifp);
3383 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3384 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3385 spin_unlock(&ifp->lock);
3388 /* ifp->prefered_lft <= ifp->valid_lft */
3389 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3390 next = ifp->tstamp + ifp->prefered_lft * HZ;
3391 spin_unlock(&ifp->lock);
3396 next_sec = round_jiffies_up(next);
3399 /* If rounded timeout is accurate enough, accept it. */
3400 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3401 next_sched = next_sec;
3403 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3404 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3405 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3407 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3408 now, next, next_sec, next_sched));
3410 addr_chk_timer.expires = next_sched;
3411 add_timer(&addr_chk_timer);
3412 spin_unlock(&addrconf_verify_lock);
3413 rcu_read_unlock_bh();
3416 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3418 struct in6_addr *pfx = NULL;
3421 pfx = nla_data(addr);
3424 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3427 pfx = nla_data(local);
3433 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3434 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3435 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3436 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3440 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3442 struct net *net = sock_net(skb->sk);
3443 struct ifaddrmsg *ifm;
3444 struct nlattr *tb[IFA_MAX+1];
3445 struct in6_addr *pfx;
3448 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3452 ifm = nlmsg_data(nlh);
3453 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3457 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3460 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3461 u32 prefered_lft, u32 valid_lft)
3465 unsigned long timeout;
3467 if (!valid_lft || (prefered_lft > valid_lft))
3470 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3471 if (addrconf_finite_timeout(timeout)) {
3472 expires = jiffies_to_clock_t(timeout * HZ);
3473 valid_lft = timeout;
3474 flags = RTF_EXPIRES;
3478 ifa_flags |= IFA_F_PERMANENT;
3481 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3482 if (addrconf_finite_timeout(timeout)) {
3484 ifa_flags |= IFA_F_DEPRECATED;
3485 prefered_lft = timeout;
3488 spin_lock_bh(&ifp->lock);
3489 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3490 ifp->tstamp = jiffies;
3491 ifp->valid_lft = valid_lft;
3492 ifp->prefered_lft = prefered_lft;
3494 spin_unlock_bh(&ifp->lock);
3495 if (!(ifp->flags&IFA_F_TENTATIVE))
3496 ipv6_ifa_notify(0, ifp);
3498 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3506 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3508 struct net *net = sock_net(skb->sk);
3509 struct ifaddrmsg *ifm;
3510 struct nlattr *tb[IFA_MAX+1];
3511 struct in6_addr *pfx;
3512 struct inet6_ifaddr *ifa;
3513 struct net_device *dev;
3514 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3518 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3522 ifm = nlmsg_data(nlh);
3523 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3527 if (tb[IFA_CACHEINFO]) {
3528 struct ifa_cacheinfo *ci;
3530 ci = nla_data(tb[IFA_CACHEINFO]);
3531 valid_lft = ci->ifa_valid;
3532 preferred_lft = ci->ifa_prefered;
3534 preferred_lft = INFINITY_LIFE_TIME;
3535 valid_lft = INFINITY_LIFE_TIME;
3538 dev = __dev_get_by_index(net, ifm->ifa_index);
3542 /* We ignore other flags so far. */
3543 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3545 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3548 * It would be best to check for !NLM_F_CREATE here but
3549 * userspace alreay relies on not having to provide this.
3551 return inet6_addr_add(net, ifm->ifa_index, pfx,
3552 ifm->ifa_prefixlen, ifa_flags,
3553 preferred_lft, valid_lft);
3556 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3557 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3560 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3567 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3568 u8 scope, int ifindex)
3570 struct ifaddrmsg *ifm;
3572 ifm = nlmsg_data(nlh);
3573 ifm->ifa_family = AF_INET6;
3574 ifm->ifa_prefixlen = prefixlen;
3575 ifm->ifa_flags = flags;
3576 ifm->ifa_scope = scope;
3577 ifm->ifa_index = ifindex;
3580 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3581 unsigned long tstamp, u32 preferred, u32 valid)
3583 struct ifa_cacheinfo ci;
3585 ci.cstamp = cstamp_delta(cstamp);
3586 ci.tstamp = cstamp_delta(tstamp);
3587 ci.ifa_prefered = preferred;
3588 ci.ifa_valid = valid;
3590 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3593 static inline int rt_scope(int ifa_scope)
3595 if (ifa_scope & IFA_HOST)
3596 return RT_SCOPE_HOST;
3597 else if (ifa_scope & IFA_LINK)
3598 return RT_SCOPE_LINK;
3599 else if (ifa_scope & IFA_SITE)
3600 return RT_SCOPE_SITE;
3602 return RT_SCOPE_UNIVERSE;
3605 static inline int inet6_ifaddr_msgsize(void)
3607 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3608 + nla_total_size(16) /* IFA_ADDRESS */
3609 + nla_total_size(sizeof(struct ifa_cacheinfo));
3612 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3613 u32 pid, u32 seq, int event, unsigned int flags)
3615 struct nlmsghdr *nlh;
3616 u32 preferred, valid;
3618 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3622 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3623 ifa->idev->dev->ifindex);
3625 if (!(ifa->flags&IFA_F_PERMANENT)) {
3626 preferred = ifa->prefered_lft;
3627 valid = ifa->valid_lft;
3628 if (preferred != INFINITY_LIFE_TIME) {
3629 long tval = (jiffies - ifa->tstamp)/HZ;
3630 if (preferred > tval)
3634 if (valid != INFINITY_LIFE_TIME) {
3642 preferred = INFINITY_LIFE_TIME;
3643 valid = INFINITY_LIFE_TIME;
3646 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3647 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3648 nlmsg_cancel(skb, nlh);
3652 return nlmsg_end(skb, nlh);
3655 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3656 u32 pid, u32 seq, int event, u16 flags)
3658 struct nlmsghdr *nlh;
3659 u8 scope = RT_SCOPE_UNIVERSE;
3660 int ifindex = ifmca->idev->dev->ifindex;
3662 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3663 scope = RT_SCOPE_SITE;
3665 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3669 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3670 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3671 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3672 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3673 nlmsg_cancel(skb, nlh);
3677 return nlmsg_end(skb, nlh);
3680 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3681 u32 pid, u32 seq, int event, unsigned int flags)
3683 struct nlmsghdr *nlh;
3684 u8 scope = RT_SCOPE_UNIVERSE;
3685 int ifindex = ifaca->aca_idev->dev->ifindex;
3687 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3688 scope = RT_SCOPE_SITE;
3690 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3694 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3695 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3696 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3697 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3698 nlmsg_cancel(skb, nlh);
3702 return nlmsg_end(skb, nlh);
3711 /* called with rcu_read_lock() */
3712 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3713 struct netlink_callback *cb, enum addr_type_t type,
3714 int s_ip_idx, int *p_ip_idx)
3716 struct ifmcaddr6 *ifmca;
3717 struct ifacaddr6 *ifaca;
3719 int ip_idx = *p_ip_idx;
3721 read_lock_bh(&idev->lock);
3723 case UNICAST_ADDR: {
3724 struct inet6_ifaddr *ifa;
3726 /* unicast address incl. temp addr */
3727 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3728 if (++ip_idx < s_ip_idx)
3730 err = inet6_fill_ifaddr(skb, ifa,
3731 NETLINK_CB(cb->skb).pid,
3740 case MULTICAST_ADDR:
3741 /* multicast address */
3742 for (ifmca = idev->mc_list; ifmca;
3743 ifmca = ifmca->next, ip_idx++) {
3744 if (ip_idx < s_ip_idx)
3746 err = inet6_fill_ifmcaddr(skb, ifmca,
3747 NETLINK_CB(cb->skb).pid,
3756 /* anycast address */
3757 for (ifaca = idev->ac_list; ifaca;
3758 ifaca = ifaca->aca_next, ip_idx++) {
3759 if (ip_idx < s_ip_idx)
3761 err = inet6_fill_ifacaddr(skb, ifaca,
3762 NETLINK_CB(cb->skb).pid,
3773 read_unlock_bh(&idev->lock);
3778 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3779 enum addr_type_t type)
3781 struct net *net = sock_net(skb->sk);
3784 int s_idx, s_ip_idx;
3785 struct net_device *dev;
3786 struct inet6_dev *idev;
3787 struct hlist_head *head;
3788 struct hlist_node *node;
3791 s_idx = idx = cb->args[1];
3792 s_ip_idx = ip_idx = cb->args[2];
3795 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3797 head = &net->dev_index_head[h];
3798 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3801 if (h > s_h || idx > s_idx)
3804 idev = __in6_dev_get(dev);
3808 if (in6_dump_addrs(idev, skb, cb, type,
3809 s_ip_idx, &ip_idx) <= 0)
3819 cb->args[2] = ip_idx;
3824 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3826 enum addr_type_t type = UNICAST_ADDR;
3828 return inet6_dump_addr(skb, cb, type);
3831 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3833 enum addr_type_t type = MULTICAST_ADDR;
3835 return inet6_dump_addr(skb, cb, type);
3839 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3841 enum addr_type_t type = ANYCAST_ADDR;
3843 return inet6_dump_addr(skb, cb, type);
3846 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3849 struct net *net = sock_net(in_skb->sk);
3850 struct ifaddrmsg *ifm;
3851 struct nlattr *tb[IFA_MAX+1];
3852 struct in6_addr *addr = NULL;
3853 struct net_device *dev = NULL;
3854 struct inet6_ifaddr *ifa;
3855 struct sk_buff *skb;
3858 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3862 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3868 ifm = nlmsg_data(nlh);
3870 dev = __dev_get_by_index(net, ifm->ifa_index);
3872 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
3874 err = -EADDRNOTAVAIL;
3878 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
3884 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3885 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3887 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3888 WARN_ON(err == -EMSGSIZE);
3892 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
3899 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3901 struct sk_buff *skb;
3902 struct net *net = dev_net(ifa->idev->dev);
3905 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3909 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3911 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3912 WARN_ON(err == -EMSGSIZE);
3916 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3920 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3923 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3924 __s32 *array, int bytes)
3926 BUG_ON(bytes < (DEVCONF_MAX * 4));
3928 memset(array, 0, bytes);
3929 array[DEVCONF_FORWARDING] = cnf->forwarding;
3930 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3931 array[DEVCONF_MTU6] = cnf->mtu6;
3932 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3933 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3934 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3935 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3936 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3937 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
3938 jiffies_to_msecs(cnf->rtr_solicit_interval);
3939 array[DEVCONF_RTR_SOLICIT_DELAY] =
3940 jiffies_to_msecs(cnf->rtr_solicit_delay);
3941 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3942 #ifdef CONFIG_IPV6_PRIVACY
3943 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3944 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3945 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3946 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3947 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3949 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3950 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3951 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
3952 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3953 #ifdef CONFIG_IPV6_ROUTER_PREF
3954 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3955 array[DEVCONF_RTR_PROBE_INTERVAL] =
3956 jiffies_to_msecs(cnf->rtr_probe_interval);
3957 #ifdef CONFIG_IPV6_ROUTE_INFO
3958 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3961 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3962 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3963 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3964 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3966 #ifdef CONFIG_IPV6_MROUTE
3967 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3969 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
3970 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
3971 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
3974 static inline size_t inet6_ifla6_size(void)
3976 return nla_total_size(4) /* IFLA_INET6_FLAGS */
3977 + nla_total_size(sizeof(struct ifla_cacheinfo))
3978 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3979 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3980 + nla_total_size(ICMP6_MIB_MAX * 8); /* IFLA_INET6_ICMP6STATS */
3983 static inline size_t inet6_if_nlmsg_size(void)
3985 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3986 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3987 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3988 + nla_total_size(4) /* IFLA_MTU */
3989 + nla_total_size(4) /* IFLA_LINK */
3990 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
3993 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
3994 int items, int bytes)
3997 int pad = bytes - sizeof(u64) * items;
4000 /* Use put_unaligned() because stats may not be aligned for u64. */
4001 put_unaligned(items, &stats[0]);
4002 for (i = 1; i < items; i++)
4003 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4005 memset(&stats[items], 0, pad);
4008 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
4009 int items, int bytes, size_t syncpoff)
4012 int pad = bytes - sizeof(u64) * items;
4015 /* Use put_unaligned() because stats may not be aligned for u64. */
4016 put_unaligned(items, &stats[0]);
4017 for (i = 1; i < items; i++)
4018 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4020 memset(&stats[items], 0, pad);
4023 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4027 case IFLA_INET6_STATS:
4028 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
4029 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
4031 case IFLA_INET6_ICMP6STATS:
4032 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
4037 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4040 struct ifla_cacheinfo ci;
4042 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
4044 ci.max_reasm_len = IPV6_MAXPLEN;
4045 ci.tstamp = cstamp_delta(idev->tstamp);
4046 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4047 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
4048 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
4050 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4052 goto nla_put_failure;
4053 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4055 /* XXX - MC not implemented */
4057 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4059 goto nla_put_failure;
4060 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4062 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4064 goto nla_put_failure;
4065 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4073 static size_t inet6_get_link_af_size(const struct net_device *dev)
4075 if (!__in6_dev_get(dev))
4078 return inet6_ifla6_size();
4081 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4083 struct inet6_dev *idev = __in6_dev_get(dev);
4088 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4094 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4095 u32 pid, u32 seq, int event, unsigned int flags)
4097 struct net_device *dev = idev->dev;
4098 struct ifinfomsg *hdr;
4099 struct nlmsghdr *nlh;
4102 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
4106 hdr = nlmsg_data(nlh);
4107 hdr->ifi_family = AF_INET6;
4109 hdr->ifi_type = dev->type;
4110 hdr->ifi_index = dev->ifindex;
4111 hdr->ifi_flags = dev_get_flags(dev);
4112 hdr->ifi_change = 0;
4114 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
4117 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
4119 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
4120 if (dev->ifindex != dev->iflink)
4121 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
4123 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4124 if (protoinfo == NULL)
4125 goto nla_put_failure;
4127 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4128 goto nla_put_failure;
4130 nla_nest_end(skb, protoinfo);
4131 return nlmsg_end(skb, nlh);
4134 nlmsg_cancel(skb, nlh);
4138 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4140 struct net *net = sock_net(skb->sk);
4143 struct net_device *dev;
4144 struct inet6_dev *idev;
4145 struct hlist_head *head;
4146 struct hlist_node *node;
4149 s_idx = cb->args[1];
4152 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4154 head = &net->dev_index_head[h];
4155 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
4158 idev = __in6_dev_get(dev);
4161 if (inet6_fill_ifinfo(skb, idev,
4162 NETLINK_CB(cb->skb).pid,
4164 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4178 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4180 struct sk_buff *skb;
4181 struct net *net = dev_net(idev->dev);
4184 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4188 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4190 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4191 WARN_ON(err == -EMSGSIZE);
4195 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4199 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4202 static inline size_t inet6_prefix_nlmsg_size(void)
4204 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4205 + nla_total_size(sizeof(struct in6_addr))
4206 + nla_total_size(sizeof(struct prefix_cacheinfo));
4209 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4210 struct prefix_info *pinfo, u32 pid, u32 seq,
4211 int event, unsigned int flags)
4213 struct prefixmsg *pmsg;
4214 struct nlmsghdr *nlh;
4215 struct prefix_cacheinfo ci;
4217 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
4221 pmsg = nlmsg_data(nlh);
4222 pmsg->prefix_family = AF_INET6;
4223 pmsg->prefix_pad1 = 0;
4224 pmsg->prefix_pad2 = 0;
4225 pmsg->prefix_ifindex = idev->dev->ifindex;
4226 pmsg->prefix_len = pinfo->prefix_len;
4227 pmsg->prefix_type = pinfo->type;
4228 pmsg->prefix_pad3 = 0;
4229 pmsg->prefix_flags = 0;
4231 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4232 if (pinfo->autoconf)
4233 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4235 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
4237 ci.preferred_time = ntohl(pinfo->prefered);
4238 ci.valid_time = ntohl(pinfo->valid);
4239 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
4241 return nlmsg_end(skb, nlh);
4244 nlmsg_cancel(skb, nlh);
4248 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4249 struct prefix_info *pinfo)
4251 struct sk_buff *skb;
4252 struct net *net = dev_net(idev->dev);
4255 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4259 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4261 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4262 WARN_ON(err == -EMSGSIZE);
4266 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4270 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4273 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4275 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4280 * If the address was optimistic
4281 * we inserted the route at the start of
4282 * our DAD process, so we don't need
4285 if (!(ifp->rt->rt6i_node))
4286 ip6_ins_rt(ifp->rt);
4287 if (ifp->idev->cnf.forwarding)
4288 addrconf_join_anycast(ifp);
4291 if (ifp->idev->cnf.forwarding)
4292 addrconf_leave_anycast(ifp);
4293 addrconf_leave_solict(ifp->idev, &ifp->addr);
4294 dst_hold(&ifp->rt->dst);
4296 if (ip6_del_rt(ifp->rt))
4297 dst_free(&ifp->rt->dst);
4302 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4305 if (likely(ifp->idev->dead == 0))
4306 __ipv6_ifa_notify(event, ifp);
4307 rcu_read_unlock_bh();
4310 #ifdef CONFIG_SYSCTL
4313 int addrconf_sysctl_forward(ctl_table *ctl, int write,
4314 void __user *buffer, size_t *lenp, loff_t *ppos)
4316 int *valp = ctl->data;
4321 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4324 ret = addrconf_fixup_forwarding(ctl, valp, val);
4331 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
4332 void __user *buffer, size_t *lenp, loff_t *ppos)
4334 struct inet6_dev *idev = ctl->extra1;
4335 int min_mtu = IPV6_MIN_MTU;
4336 struct ctl_table lctl;
4339 lctl.extra1 = &min_mtu;
4340 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
4342 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
4345 static void dev_disable_change(struct inet6_dev *idev)
4347 if (!idev || !idev->dev)
4350 if (idev->cnf.disable_ipv6)
4351 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4353 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4356 static void addrconf_disable_change(struct net *net, __s32 newf)
4358 struct net_device *dev;
4359 struct inet6_dev *idev;
4361 for_each_netdev(net, dev) {
4362 idev = __in6_dev_get(dev);
4364 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4365 idev->cnf.disable_ipv6 = newf;
4367 dev_disable_change(idev);
4372 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int old)
4376 net = (struct net *)table->extra2;
4378 if (p == &net->ipv6.devconf_dflt->disable_ipv6)
4381 if (!rtnl_trylock()) {
4382 /* Restore the original values before restarting */
4384 return restart_syscall();
4387 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4388 __s32 newf = net->ipv6.devconf_all->disable_ipv6;
4389 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4390 addrconf_disable_change(net, newf);
4391 } else if ((!*p) ^ (!old))
4392 dev_disable_change((struct inet6_dev *)table->extra1);
4399 int addrconf_sysctl_disable(ctl_table *ctl, int write,
4400 void __user *buffer, size_t *lenp, loff_t *ppos)
4402 int *valp = ctl->data;
4407 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4410 ret = addrconf_disable_ipv6(ctl, valp, val);
4416 static struct addrconf_sysctl_table
4418 struct ctl_table_header *sysctl_header;
4419 ctl_table addrconf_vars[DEVCONF_MAX+1];
4421 } addrconf_sysctl __read_mostly = {
4422 .sysctl_header = NULL,
4425 .procname = "forwarding",
4426 .data = &ipv6_devconf.forwarding,
4427 .maxlen = sizeof(int),
4429 .proc_handler = addrconf_sysctl_forward,
4432 .procname = "hop_limit",
4433 .data = &ipv6_devconf.hop_limit,
4434 .maxlen = sizeof(int),
4436 .proc_handler = proc_dointvec,
4440 .data = &ipv6_devconf.mtu6,
4441 .maxlen = sizeof(int),
4443 .proc_handler = addrconf_sysctl_mtu,
4446 .procname = "accept_ra",
4447 .data = &ipv6_devconf.accept_ra,
4448 .maxlen = sizeof(int),
4450 .proc_handler = proc_dointvec,
4453 .procname = "accept_redirects",
4454 .data = &ipv6_devconf.accept_redirects,
4455 .maxlen = sizeof(int),
4457 .proc_handler = proc_dointvec,
4460 .procname = "autoconf",
4461 .data = &ipv6_devconf.autoconf,
4462 .maxlen = sizeof(int),
4464 .proc_handler = proc_dointvec,
4467 .procname = "dad_transmits",
4468 .data = &ipv6_devconf.dad_transmits,
4469 .maxlen = sizeof(int),
4471 .proc_handler = proc_dointvec,
4474 .procname = "router_solicitations",
4475 .data = &ipv6_devconf.rtr_solicits,
4476 .maxlen = sizeof(int),
4478 .proc_handler = proc_dointvec,
4481 .procname = "router_solicitation_interval",
4482 .data = &ipv6_devconf.rtr_solicit_interval,
4483 .maxlen = sizeof(int),
4485 .proc_handler = proc_dointvec_jiffies,
4488 .procname = "router_solicitation_delay",
4489 .data = &ipv6_devconf.rtr_solicit_delay,
4490 .maxlen = sizeof(int),
4492 .proc_handler = proc_dointvec_jiffies,
4495 .procname = "force_mld_version",
4496 .data = &ipv6_devconf.force_mld_version,
4497 .maxlen = sizeof(int),
4499 .proc_handler = proc_dointvec,
4501 #ifdef CONFIG_IPV6_PRIVACY
4503 .procname = "use_tempaddr",
4504 .data = &ipv6_devconf.use_tempaddr,
4505 .maxlen = sizeof(int),
4507 .proc_handler = proc_dointvec,
4510 .procname = "temp_valid_lft",
4511 .data = &ipv6_devconf.temp_valid_lft,
4512 .maxlen = sizeof(int),
4514 .proc_handler = proc_dointvec,
4517 .procname = "temp_prefered_lft",
4518 .data = &ipv6_devconf.temp_prefered_lft,
4519 .maxlen = sizeof(int),
4521 .proc_handler = proc_dointvec,
4524 .procname = "regen_max_retry",
4525 .data = &ipv6_devconf.regen_max_retry,
4526 .maxlen = sizeof(int),
4528 .proc_handler = proc_dointvec,
4531 .procname = "max_desync_factor",
4532 .data = &ipv6_devconf.max_desync_factor,
4533 .maxlen = sizeof(int),
4535 .proc_handler = proc_dointvec,
4539 .procname = "max_addresses",
4540 .data = &ipv6_devconf.max_addresses,
4541 .maxlen = sizeof(int),
4543 .proc_handler = proc_dointvec,
4546 .procname = "accept_ra_defrtr",
4547 .data = &ipv6_devconf.accept_ra_defrtr,
4548 .maxlen = sizeof(int),
4550 .proc_handler = proc_dointvec,
4553 .procname = "accept_ra_min_hop_limit",
4554 .data = &ipv6_devconf.accept_ra_min_hop_limit,
4555 .maxlen = sizeof(int),
4557 .proc_handler = proc_dointvec,
4560 .procname = "accept_ra_pinfo",
4561 .data = &ipv6_devconf.accept_ra_pinfo,
4562 .maxlen = sizeof(int),
4564 .proc_handler = proc_dointvec,
4566 #ifdef CONFIG_IPV6_ROUTER_PREF
4568 .procname = "accept_ra_rtr_pref",
4569 .data = &ipv6_devconf.accept_ra_rtr_pref,
4570 .maxlen = sizeof(int),
4572 .proc_handler = proc_dointvec,
4575 .procname = "router_probe_interval",
4576 .data = &ipv6_devconf.rtr_probe_interval,
4577 .maxlen = sizeof(int),
4579 .proc_handler = proc_dointvec_jiffies,
4581 #ifdef CONFIG_IPV6_ROUTE_INFO
4583 .procname = "accept_ra_rt_info_max_plen",
4584 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4585 .maxlen = sizeof(int),
4587 .proc_handler = proc_dointvec,
4592 .procname = "proxy_ndp",
4593 .data = &ipv6_devconf.proxy_ndp,
4594 .maxlen = sizeof(int),
4596 .proc_handler = proc_dointvec,
4599 .procname = "accept_source_route",
4600 .data = &ipv6_devconf.accept_source_route,
4601 .maxlen = sizeof(int),
4603 .proc_handler = proc_dointvec,
4605 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4607 .procname = "optimistic_dad",
4608 .data = &ipv6_devconf.optimistic_dad,
4609 .maxlen = sizeof(int),
4611 .proc_handler = proc_dointvec,
4615 #ifdef CONFIG_IPV6_MROUTE
4617 .procname = "mc_forwarding",
4618 .data = &ipv6_devconf.mc_forwarding,
4619 .maxlen = sizeof(int),
4621 .proc_handler = proc_dointvec,
4625 .procname = "disable_ipv6",
4626 .data = &ipv6_devconf.disable_ipv6,
4627 .maxlen = sizeof(int),
4629 .proc_handler = addrconf_sysctl_disable,
4632 .procname = "accept_dad",
4633 .data = &ipv6_devconf.accept_dad,
4634 .maxlen = sizeof(int),
4636 .proc_handler = proc_dointvec,
4639 .procname = "force_tllao",
4640 .data = &ipv6_devconf.force_tllao,
4641 .maxlen = sizeof(int),
4643 .proc_handler = proc_dointvec
4651 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4652 struct inet6_dev *idev, struct ipv6_devconf *p)
4655 struct addrconf_sysctl_table *t;
4657 #define ADDRCONF_CTL_PATH_DEV 3
4659 struct ctl_path addrconf_ctl_path[] = {
4660 { .procname = "net", },
4661 { .procname = "ipv6", },
4662 { .procname = "conf", },
4663 { /* to be set */ },
4668 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4672 for (i = 0; t->addrconf_vars[i].data; i++) {
4673 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
4674 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4675 t->addrconf_vars[i].extra2 = net;
4679 * Make a copy of dev_name, because '.procname' is regarded as const
4680 * by sysctl and we wouldn't want anyone to change it under our feet
4681 * (see SIOCSIFNAME).
4683 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4687 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4689 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4691 if (t->sysctl_header == NULL)
4705 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4707 struct addrconf_sysctl_table *t;
4709 if (p->sysctl == NULL)
4714 unregister_net_sysctl_table(t->sysctl_header);
4719 static void addrconf_sysctl_register(struct inet6_dev *idev)
4721 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
4722 &ndisc_ifinfo_sysctl_change);
4723 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4727 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4729 __addrconf_sysctl_unregister(&idev->cnf);
4730 neigh_sysctl_unregister(idev->nd_parms);
4736 static int __net_init addrconf_init_net(struct net *net)
4739 struct ipv6_devconf *all, *dflt;
4741 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
4745 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4747 goto err_alloc_dflt;
4749 /* these will be inherited by all namespaces */
4750 dflt->autoconf = ipv6_defaults.autoconf;
4751 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
4753 net->ipv6.devconf_all = all;
4754 net->ipv6.devconf_dflt = dflt;
4756 #ifdef CONFIG_SYSCTL
4757 err = __addrconf_sysctl_register(net, "all", NULL, all);
4761 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
4767 #ifdef CONFIG_SYSCTL
4769 __addrconf_sysctl_unregister(all);
4779 static void __net_exit addrconf_exit_net(struct net *net)
4781 #ifdef CONFIG_SYSCTL
4782 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4783 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4785 if (!net_eq(net, &init_net)) {
4786 kfree(net->ipv6.devconf_dflt);
4787 kfree(net->ipv6.devconf_all);
4791 static struct pernet_operations addrconf_ops = {
4792 .init = addrconf_init_net,
4793 .exit = addrconf_exit_net,
4800 int register_inet6addr_notifier(struct notifier_block *nb)
4802 return atomic_notifier_chain_register(&inet6addr_chain, nb);
4804 EXPORT_SYMBOL(register_inet6addr_notifier);
4806 int unregister_inet6addr_notifier(struct notifier_block *nb)
4808 return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
4810 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4812 static struct rtnl_af_ops inet6_ops = {
4814 .fill_link_af = inet6_fill_link_af,
4815 .get_link_af_size = inet6_get_link_af_size,
4819 * Init / cleanup code
4822 int __init addrconf_init(void)
4826 err = ipv6_addr_label_init();
4828 printk(KERN_CRIT "IPv6 Addrconf:"
4829 " cannot initialize default policy table: %d.\n", err);
4833 err = register_pernet_subsys(&addrconf_ops);
4837 /* The addrconf netdev notifier requires that loopback_dev
4838 * has it's ipv6 private information allocated and setup
4839 * before it can bring up and give link-local addresses
4840 * to other devices which are up.
4842 * Unfortunately, loopback_dev is not necessarily the first
4843 * entry in the global dev_base list of net devices. In fact,
4844 * it is likely to be the very last entry on that list.
4845 * So this causes the notifier registry below to try and
4846 * give link-local addresses to all devices besides loopback_dev
4847 * first, then loopback_dev, which cases all the non-loopback_dev
4848 * devices to fail to get a link-local address.
4850 * So, as a temporary fix, allocate the ipv6 structure for
4851 * loopback_dev first by hand.
4852 * Longer term, all of the dependencies ipv6 has upon the loopback
4853 * device and it being up should be removed.
4856 if (!ipv6_add_dev(init_net.loopback_dev))
4862 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4863 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
4865 register_netdevice_notifier(&ipv6_dev_notf);
4869 err = rtnl_af_register(&inet6_ops);
4873 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
4878 /* Only the first call to __rtnl_register can fail */
4879 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
4880 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
4881 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
4882 inet6_dump_ifaddr, NULL);
4883 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
4884 inet6_dump_ifmcaddr, NULL);
4885 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
4886 inet6_dump_ifacaddr, NULL);
4888 ipv6_addr_label_rtnl_register();
4892 rtnl_af_unregister(&inet6_ops);
4894 unregister_netdevice_notifier(&ipv6_dev_notf);
4896 unregister_pernet_subsys(&addrconf_ops);
4898 ipv6_addr_label_cleanup();
4903 void addrconf_cleanup(void)
4905 struct net_device *dev;
4908 unregister_netdevice_notifier(&ipv6_dev_notf);
4909 unregister_pernet_subsys(&addrconf_ops);
4910 ipv6_addr_label_cleanup();
4914 __rtnl_af_unregister(&inet6_ops);
4916 /* clean dev list */
4917 for_each_netdev(&init_net, dev) {
4918 if (__in6_dev_get(dev) == NULL)
4920 addrconf_ifdown(dev, 1);
4922 addrconf_ifdown(init_net.loopback_dev, 2);
4927 spin_lock_bh(&addrconf_hash_lock);
4928 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4929 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
4930 spin_unlock_bh(&addrconf_hash_lock);
4932 del_timer(&addr_chk_timer);