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_pinfo = 1,
189 #ifdef CONFIG_IPV6_ROUTER_PREF
190 .accept_ra_rtr_pref = 1,
191 .rtr_probe_interval = 60 * HZ,
192 #ifdef CONFIG_IPV6_ROUTE_INFO
193 .accept_ra_rt_info_max_plen = 0,
197 .accept_source_route = 0, /* we do not accept RH0 by default. */
202 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
204 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
205 .mtu6 = IPV6_MIN_MTU,
207 .accept_redirects = 1,
210 .rtr_solicits = MAX_RTR_SOLICITATIONS,
211 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
212 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
213 #ifdef CONFIG_IPV6_PRIVACY
215 .temp_valid_lft = TEMP_VALID_LIFETIME,
216 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
217 .regen_max_retry = REGEN_MAX_RETRY,
218 .max_desync_factor = MAX_DESYNC_FACTOR,
220 .max_addresses = IPV6_MAX_ADDRESSES,
221 .accept_ra_defrtr = 1,
222 .accept_ra_pinfo = 1,
223 #ifdef CONFIG_IPV6_ROUTER_PREF
224 .accept_ra_rtr_pref = 1,
225 .rtr_probe_interval = 60 * HZ,
226 #ifdef CONFIG_IPV6_ROUTE_INFO
227 .accept_ra_rt_info_max_plen = 0,
231 .accept_source_route = 0, /* we do not accept RH0 by default. */
236 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
237 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
238 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
239 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
240 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
242 /* Check if a valid qdisc is available */
243 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
245 return !qdisc_tx_is_noop(dev);
248 /* Check if a route is valid prefix route */
249 static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
251 return (rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0;
254 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
256 if (del_timer(&ifp->timer))
260 enum addrconf_timer_t {
266 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
267 enum addrconf_timer_t what,
270 if (!del_timer(&ifp->timer))
275 ifp->timer.function = addrconf_dad_timer;
278 ifp->timer.function = addrconf_rs_timer;
283 ifp->timer.expires = jiffies + when;
284 add_timer(&ifp->timer);
287 static int snmp6_alloc_dev(struct inet6_dev *idev)
289 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
290 sizeof(struct ipstats_mib),
291 __alignof__(struct ipstats_mib)) < 0)
293 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
295 if (!idev->stats.icmpv6dev)
297 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
299 if (!idev->stats.icmpv6msgdev)
305 kfree(idev->stats.icmpv6dev);
307 snmp_mib_free((void __percpu **)idev->stats.ipv6);
312 static void snmp6_free_dev(struct inet6_dev *idev)
314 kfree(idev->stats.icmpv6msgdev);
315 kfree(idev->stats.icmpv6dev);
316 snmp_mib_free((void __percpu **)idev->stats.ipv6);
319 /* Nobody refers to this device, we may destroy it. */
321 void in6_dev_finish_destroy(struct inet6_dev *idev)
323 struct net_device *dev = idev->dev;
325 WARN_ON(!list_empty(&idev->addr_list));
326 WARN_ON(idev->mc_list != NULL);
328 #ifdef NET_REFCNT_DEBUG
329 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
333 pr_warning("Freeing alive inet6 device %p\n", idev);
336 snmp6_free_dev(idev);
337 kfree_rcu(idev, rcu);
340 EXPORT_SYMBOL(in6_dev_finish_destroy);
342 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
344 struct inet6_dev *ndev;
348 if (dev->mtu < IPV6_MIN_MTU)
351 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
356 rwlock_init(&ndev->lock);
358 INIT_LIST_HEAD(&ndev->addr_list);
360 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
361 ndev->cnf.mtu6 = dev->mtu;
362 ndev->cnf.sysctl = NULL;
363 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
364 if (ndev->nd_parms == NULL) {
368 if (ndev->cnf.forwarding)
369 dev_disable_lro(dev);
370 /* We refer to the device */
373 if (snmp6_alloc_dev(ndev) < 0) {
375 "%s(): cannot allocate memory for statistics; dev=%s.\n",
376 __func__, dev->name));
377 neigh_parms_release(&nd_tbl, ndev->nd_parms);
383 if (snmp6_register_dev(ndev) < 0) {
385 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
386 __func__, dev->name));
387 neigh_parms_release(&nd_tbl, ndev->nd_parms);
389 in6_dev_finish_destroy(ndev);
393 /* One reference from device. We must do this before
394 * we invoke __ipv6_regen_rndid().
398 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
399 ndev->cnf.accept_dad = -1;
401 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
402 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
404 "%s: Disabled Multicast RS\n",
406 ndev->cnf.rtr_solicits = 0;
410 #ifdef CONFIG_IPV6_PRIVACY
411 INIT_LIST_HEAD(&ndev->tempaddr_list);
412 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
413 if ((dev->flags&IFF_LOOPBACK) ||
414 dev->type == ARPHRD_TUNNEL ||
415 dev->type == ARPHRD_TUNNEL6 ||
416 dev->type == ARPHRD_SIT ||
417 dev->type == ARPHRD_NONE) {
418 ndev->cnf.use_tempaddr = -1;
421 ipv6_regen_rndid((unsigned long) ndev);
425 if (netif_running(dev) && addrconf_qdisc_ok(dev))
426 ndev->if_flags |= IF_READY;
428 ipv6_mc_init_dev(ndev);
429 ndev->tstamp = jiffies;
430 addrconf_sysctl_register(ndev);
431 /* protected by rtnl_lock */
432 rcu_assign_pointer(dev->ip6_ptr, ndev);
434 /* Join all-node multicast group */
435 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
437 /* Join all-router multicast group if forwarding is set */
438 if (ndev->cnf.forwarding && dev && (dev->flags & IFF_MULTICAST))
439 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
444 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
446 struct inet6_dev *idev;
450 idev = __in6_dev_get(dev);
452 idev = ipv6_add_dev(dev);
457 if (dev->flags&IFF_UP)
463 static void dev_forward_change(struct inet6_dev *idev)
465 struct net_device *dev;
466 struct inet6_ifaddr *ifa;
471 if (idev->cnf.forwarding)
472 dev_disable_lro(dev);
473 if (dev && (dev->flags & IFF_MULTICAST)) {
474 if (idev->cnf.forwarding)
475 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
477 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
480 list_for_each_entry(ifa, &idev->addr_list, if_list) {
481 if (ifa->flags&IFA_F_TENTATIVE)
483 if (idev->cnf.forwarding)
484 addrconf_join_anycast(ifa);
486 addrconf_leave_anycast(ifa);
491 static void addrconf_forward_change(struct net *net, __s32 newf)
493 struct net_device *dev;
494 struct inet6_dev *idev;
496 for_each_netdev(net, dev) {
497 idev = __in6_dev_get(dev);
499 int changed = (!idev->cnf.forwarding) ^ (!newf);
500 idev->cnf.forwarding = newf;
502 dev_forward_change(idev);
507 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
511 net = (struct net *)table->extra2;
512 if (p == &net->ipv6.devconf_dflt->forwarding)
515 if (!rtnl_trylock()) {
516 /* Restore the original values before restarting */
518 return restart_syscall();
521 if (p == &net->ipv6.devconf_all->forwarding) {
522 __s32 newf = net->ipv6.devconf_all->forwarding;
523 net->ipv6.devconf_dflt->forwarding = newf;
524 addrconf_forward_change(net, newf);
525 } else if ((!*p) ^ (!old))
526 dev_forward_change((struct inet6_dev *)table->extra1);
530 rt6_purge_dflt_routers(net);
535 /* Nobody refers to this ifaddr, destroy it */
536 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
538 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
540 #ifdef NET_REFCNT_DEBUG
541 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
544 in6_dev_put(ifp->idev);
546 if (del_timer(&ifp->timer))
547 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
549 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
550 pr_warning("Freeing alive inet6 address %p\n", ifp);
553 dst_release(&ifp->rt->dst);
559 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
562 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
565 * Each device address list is sorted in order of scope -
566 * global before linklocal.
568 list_for_each(p, &idev->addr_list) {
569 struct inet6_ifaddr *ifa
570 = list_entry(p, struct inet6_ifaddr, if_list);
571 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
575 list_add_tail(&ifp->if_list, p);
578 static u32 ipv6_addr_hash(const struct in6_addr *addr)
581 * We perform the hash function over the last 64 bits of the address
582 * This will include the IEEE address token on links that support it.
584 return jhash_2words((__force u32)addr->s6_addr32[2],
585 (__force u32)addr->s6_addr32[3], 0)
586 & (IN6_ADDR_HSIZE - 1);
589 /* On success it returns ifp with increased reference count */
591 static struct inet6_ifaddr *
592 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
593 int scope, u32 flags)
595 struct inet6_ifaddr *ifa = NULL;
599 int addr_type = ipv6_addr_type(addr);
601 if (addr_type == IPV6_ADDR_ANY ||
602 addr_type & IPV6_ADDR_MULTICAST ||
603 (!(idev->dev->flags & IFF_LOOPBACK) &&
604 addr_type & IPV6_ADDR_LOOPBACK))
605 return ERR_PTR(-EADDRNOTAVAIL);
609 err = -ENODEV; /*XXX*/
613 if (idev->cnf.disable_ipv6) {
618 spin_lock(&addrconf_hash_lock);
620 /* Ignore adding duplicate addresses on an interface */
621 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
622 ADBG(("ipv6_add_addr: already assigned\n"));
627 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
630 ADBG(("ipv6_add_addr: malloc failed\n"));
635 rt = addrconf_dst_alloc(idev, addr, 0);
641 ipv6_addr_copy(&ifa->addr, addr);
643 spin_lock_init(&ifa->lock);
644 spin_lock_init(&ifa->state_lock);
645 init_timer(&ifa->timer);
646 INIT_HLIST_NODE(&ifa->addr_lst);
647 ifa->timer.data = (unsigned long) ifa;
649 ifa->prefix_len = pfxlen;
650 ifa->flags = flags | IFA_F_TENTATIVE;
651 ifa->cstamp = ifa->tstamp = jiffies;
656 * part one of RFC 4429, section 3.3
657 * We should not configure an address as
658 * optimistic if we do not yet know the link
659 * layer address of our nexhop router
662 if (dst_get_neighbour_raw(&rt->dst) == NULL)
663 ifa->flags &= ~IFA_F_OPTIMISTIC;
670 /* Add to big hash table */
671 hash = ipv6_addr_hash(addr);
673 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
674 spin_unlock(&addrconf_hash_lock);
676 write_lock(&idev->lock);
677 /* Add to inet6_dev unicast addr list. */
678 ipv6_link_dev_addr(idev, ifa);
680 #ifdef CONFIG_IPV6_PRIVACY
681 if (ifa->flags&IFA_F_TEMPORARY) {
682 list_add(&ifa->tmp_list, &idev->tempaddr_list);
688 write_unlock(&idev->lock);
690 rcu_read_unlock_bh();
692 if (likely(err == 0))
693 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
701 spin_unlock(&addrconf_hash_lock);
705 /* This function wants to get referenced ifp and releases it before return */
707 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
709 struct inet6_ifaddr *ifa, *ifn;
710 struct inet6_dev *idev = ifp->idev;
712 int deleted = 0, onlink = 0;
713 unsigned long expires = jiffies;
715 spin_lock_bh(&ifp->state_lock);
717 ifp->state = INET6_IFADDR_STATE_DEAD;
718 spin_unlock_bh(&ifp->state_lock);
720 if (state == INET6_IFADDR_STATE_DEAD)
723 spin_lock_bh(&addrconf_hash_lock);
724 hlist_del_init_rcu(&ifp->addr_lst);
725 spin_unlock_bh(&addrconf_hash_lock);
727 write_lock_bh(&idev->lock);
728 #ifdef CONFIG_IPV6_PRIVACY
729 if (ifp->flags&IFA_F_TEMPORARY) {
730 list_del(&ifp->tmp_list);
732 in6_ifa_put(ifp->ifpub);
739 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
741 list_del_init(&ifp->if_list);
744 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
748 } else if (ifp->flags & IFA_F_PERMANENT) {
749 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
751 if (ifa->flags & IFA_F_PERMANENT) {
756 unsigned long lifetime;
761 spin_lock(&ifa->lock);
763 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
765 * Note: Because this address is
766 * not permanent, lifetime <
767 * LONG_MAX / HZ here.
769 if (time_before(expires,
770 ifa->tstamp + lifetime * HZ))
771 expires = ifa->tstamp + lifetime * HZ;
772 spin_unlock(&ifa->lock);
777 write_unlock_bh(&idev->lock);
779 addrconf_del_timer(ifp);
781 ipv6_ifa_notify(RTM_DELADDR, ifp);
783 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
786 * Purge or update corresponding prefix
788 * 1) we don't purge prefix here if address was not permanent.
789 * prefix is managed by its own lifetime.
790 * 2) if there're no addresses, delete prefix.
791 * 3) if there're still other permanent address(es),
792 * corresponding prefix is still permanent.
793 * 4) otherwise, update prefix lifetime to the
794 * longest valid lifetime among the corresponding
795 * addresses on the device.
796 * Note: subsequent RA will update lifetime.
800 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
801 struct in6_addr prefix;
803 struct net *net = dev_net(ifp->idev->dev);
804 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
805 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
807 if (rt && addrconf_is_prefix_route(rt)) {
811 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
812 rt->rt6i_expires = expires;
813 rt->rt6i_flags |= RTF_EXPIRES;
816 dst_release(&rt->dst);
819 /* clean up prefsrc entries */
820 rt6_remove_prefsrc(ifp);
825 #ifdef CONFIG_IPV6_PRIVACY
826 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
828 struct inet6_dev *idev = ifp->idev;
829 struct in6_addr addr, *tmpaddr;
830 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
831 unsigned long regen_advance;
836 unsigned long now = jiffies;
838 write_lock(&idev->lock);
840 spin_lock_bh(&ift->lock);
841 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
842 spin_unlock_bh(&ift->lock);
849 if (idev->cnf.use_tempaddr <= 0) {
850 write_unlock(&idev->lock);
852 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
857 spin_lock_bh(&ifp->lock);
858 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
859 idev->cnf.use_tempaddr = -1; /*XXX*/
860 spin_unlock_bh(&ifp->lock);
861 write_unlock(&idev->lock);
863 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
869 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
870 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
871 spin_unlock_bh(&ifp->lock);
872 write_unlock(&idev->lock);
874 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
880 memcpy(&addr.s6_addr[8], idev->rndid, 8);
881 age = (now - ifp->tstamp) / HZ;
882 tmp_valid_lft = min_t(__u32,
884 idev->cnf.temp_valid_lft + age);
885 tmp_prefered_lft = min_t(__u32,
887 idev->cnf.temp_prefered_lft + age -
888 idev->cnf.max_desync_factor);
889 tmp_plen = ifp->prefix_len;
890 max_addresses = idev->cnf.max_addresses;
891 tmp_tstamp = ifp->tstamp;
892 spin_unlock_bh(&ifp->lock);
894 regen_advance = idev->cnf.regen_max_retry *
895 idev->cnf.dad_transmits *
896 idev->nd_parms->retrans_time / HZ;
897 write_unlock(&idev->lock);
899 /* A temporary address is created only if this calculated Preferred
900 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
901 * an implementation must not create a temporary address with a zero
902 * Preferred Lifetime.
903 * Use age calculation as in addrconf_verify to avoid unnecessary
904 * temporary addresses being generated.
906 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
907 if (tmp_prefered_lft <= regen_advance + age) {
914 addr_flags = IFA_F_TEMPORARY;
915 /* set in addrconf_prefix_rcv() */
916 if (ifp->flags & IFA_F_OPTIMISTIC)
917 addr_flags |= IFA_F_OPTIMISTIC;
919 ift = ipv6_add_addr(idev, &addr, tmp_plen,
920 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
926 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
928 write_lock(&idev->lock);
932 spin_lock_bh(&ift->lock);
934 ift->valid_lft = tmp_valid_lft;
935 ift->prefered_lft = tmp_prefered_lft;
937 ift->tstamp = tmp_tstamp;
938 spin_unlock_bh(&ift->lock);
940 addrconf_dad_start(ift, 0);
949 * Choose an appropriate source address (RFC3484)
952 IPV6_SADDR_RULE_INIT = 0,
953 IPV6_SADDR_RULE_LOCAL,
954 IPV6_SADDR_RULE_SCOPE,
955 IPV6_SADDR_RULE_PREFERRED,
956 #ifdef CONFIG_IPV6_MIP6
960 IPV6_SADDR_RULE_LABEL,
961 #ifdef CONFIG_IPV6_PRIVACY
962 IPV6_SADDR_RULE_PRIVACY,
964 IPV6_SADDR_RULE_ORCHID,
965 IPV6_SADDR_RULE_PREFIX,
969 struct ipv6_saddr_score {
972 struct inet6_ifaddr *ifa;
973 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
978 struct ipv6_saddr_dst {
979 const struct in6_addr *addr;
986 static inline int ipv6_saddr_preferred(int type)
988 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
993 static int ipv6_get_saddr_eval(struct net *net,
994 struct ipv6_saddr_score *score,
995 struct ipv6_saddr_dst *dst,
1000 if (i <= score->rule) {
1002 case IPV6_SADDR_RULE_SCOPE:
1003 ret = score->scopedist;
1005 case IPV6_SADDR_RULE_PREFIX:
1006 ret = score->matchlen;
1009 ret = !!test_bit(i, score->scorebits);
1015 case IPV6_SADDR_RULE_INIT:
1016 /* Rule 0: remember if hiscore is not ready yet */
1019 case IPV6_SADDR_RULE_LOCAL:
1020 /* Rule 1: Prefer same address */
1021 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1023 case IPV6_SADDR_RULE_SCOPE:
1024 /* Rule 2: Prefer appropriate scope
1029 * ---+--+-+---> scope
1031 * | d is scope of the destination.
1033 * | \ <- smaller scope is better if
1034 * B-15 | \ if scope is enough for destinaion.
1035 * | ret = B - scope (-1 <= scope >= d <= 15).
1037 * |/ <- greater is better
1038 * -C / if scope is not enough for destination.
1039 * /| ret = scope - C (-1 <= d < scope <= 15).
1041 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1042 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1043 * Assume B = 0 and we get C > 29.
1045 ret = __ipv6_addr_src_scope(score->addr_type);
1046 if (ret >= dst->scope)
1049 ret -= 128; /* 30 is enough */
1050 score->scopedist = ret;
1052 case IPV6_SADDR_RULE_PREFERRED:
1053 /* Rule 3: Avoid deprecated and optimistic addresses */
1054 ret = ipv6_saddr_preferred(score->addr_type) ||
1055 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1057 #ifdef CONFIG_IPV6_MIP6
1058 case IPV6_SADDR_RULE_HOA:
1060 /* Rule 4: Prefer home address */
1061 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1062 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1066 case IPV6_SADDR_RULE_OIF:
1067 /* Rule 5: Prefer outgoing interface */
1068 ret = (!dst->ifindex ||
1069 dst->ifindex == score->ifa->idev->dev->ifindex);
1071 case IPV6_SADDR_RULE_LABEL:
1072 /* Rule 6: Prefer matching label */
1073 ret = ipv6_addr_label(net,
1074 &score->ifa->addr, score->addr_type,
1075 score->ifa->idev->dev->ifindex) == dst->label;
1077 #ifdef CONFIG_IPV6_PRIVACY
1078 case IPV6_SADDR_RULE_PRIVACY:
1080 /* Rule 7: Prefer public address
1081 * Note: prefer temporary address if use_tempaddr >= 2
1083 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1084 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1085 score->ifa->idev->cnf.use_tempaddr >= 2;
1086 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1090 case IPV6_SADDR_RULE_ORCHID:
1091 /* Rule 8-: Prefer ORCHID vs ORCHID or
1092 * non-ORCHID vs non-ORCHID
1094 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1095 ipv6_addr_orchid(dst->addr));
1097 case IPV6_SADDR_RULE_PREFIX:
1098 /* Rule 8: Use longest matching prefix */
1099 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1107 __set_bit(i, score->scorebits);
1113 int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
1114 const struct in6_addr *daddr, unsigned int prefs,
1115 struct in6_addr *saddr)
1117 struct ipv6_saddr_score scores[2],
1118 *score = &scores[0], *hiscore = &scores[1];
1119 struct ipv6_saddr_dst dst;
1120 struct net_device *dev;
1123 dst_type = __ipv6_addr_type(daddr);
1125 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1126 dst.scope = __ipv6_addr_src_scope(dst_type);
1127 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1131 hiscore->ifa = NULL;
1135 for_each_netdev_rcu(net, dev) {
1136 struct inet6_dev *idev;
1138 /* Candidate Source Address (section 4)
1139 * - multicast and link-local destination address,
1140 * the set of candidate source address MUST only
1141 * include addresses assigned to interfaces
1142 * belonging to the same link as the outgoing
1144 * (- For site-local destination addresses, the
1145 * set of candidate source addresses MUST only
1146 * include addresses assigned to interfaces
1147 * belonging to the same site as the outgoing
1150 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1151 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1152 dst.ifindex && dev->ifindex != dst.ifindex)
1155 idev = __in6_dev_get(dev);
1159 read_lock_bh(&idev->lock);
1160 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1164 * - Tentative Address (RFC2462 section 5.4)
1165 * - A tentative address is not considered
1166 * "assigned to an interface" in the traditional
1167 * sense, unless it is also flagged as optimistic.
1168 * - Candidate Source Address (section 4)
1169 * - In any case, anycast addresses, multicast
1170 * addresses, and the unspecified address MUST
1171 * NOT be included in a candidate set.
1173 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1174 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1177 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1179 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1180 score->addr_type & IPV6_ADDR_MULTICAST)) {
1181 LIMIT_NETDEBUG(KERN_DEBUG
1182 "ADDRCONF: unspecified / multicast address "
1183 "assigned as unicast address on %s",
1189 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1191 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1192 int minihiscore, miniscore;
1194 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1195 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1197 if (minihiscore > miniscore) {
1198 if (i == IPV6_SADDR_RULE_SCOPE &&
1199 score->scopedist > 0) {
1202 * each remaining entry
1203 * has too small (not enough)
1204 * scope, because ifa entries
1205 * are sorted by their scope
1211 } else if (minihiscore < miniscore) {
1213 in6_ifa_put(hiscore->ifa);
1215 in6_ifa_hold(score->ifa);
1217 swap(hiscore, score);
1219 /* restore our iterator */
1220 score->ifa = hiscore->ifa;
1227 read_unlock_bh(&idev->lock);
1232 return -EADDRNOTAVAIL;
1234 ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1235 in6_ifa_put(hiscore->ifa);
1238 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1240 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1241 unsigned char banned_flags)
1243 struct inet6_ifaddr *ifp;
1244 int err = -EADDRNOTAVAIL;
1246 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1247 if (ifp->scope == IFA_LINK &&
1248 !(ifp->flags & banned_flags)) {
1249 ipv6_addr_copy(addr, &ifp->addr);
1257 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1258 unsigned char banned_flags)
1260 struct inet6_dev *idev;
1261 int err = -EADDRNOTAVAIL;
1264 idev = __in6_dev_get(dev);
1266 read_lock_bh(&idev->lock);
1267 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1268 read_unlock_bh(&idev->lock);
1274 static int ipv6_count_addresses(struct inet6_dev *idev)
1277 struct inet6_ifaddr *ifp;
1279 read_lock_bh(&idev->lock);
1280 list_for_each_entry(ifp, &idev->addr_list, if_list)
1282 read_unlock_bh(&idev->lock);
1286 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1287 struct net_device *dev, int strict)
1289 struct inet6_ifaddr *ifp;
1290 struct hlist_node *node;
1291 unsigned int hash = ipv6_addr_hash(addr);
1294 hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1295 if (!net_eq(dev_net(ifp->idev->dev), net))
1297 if (ipv6_addr_equal(&ifp->addr, addr) &&
1298 !(ifp->flags&IFA_F_TENTATIVE) &&
1299 (dev == NULL || ifp->idev->dev == dev ||
1300 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1301 rcu_read_unlock_bh();
1306 rcu_read_unlock_bh();
1309 EXPORT_SYMBOL(ipv6_chk_addr);
1311 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1312 struct net_device *dev)
1314 unsigned int hash = ipv6_addr_hash(addr);
1315 struct inet6_ifaddr *ifp;
1316 struct hlist_node *node;
1318 hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1319 if (!net_eq(dev_net(ifp->idev->dev), net))
1321 if (ipv6_addr_equal(&ifp->addr, addr)) {
1322 if (dev == NULL || ifp->idev->dev == dev)
1329 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1331 struct inet6_dev *idev;
1332 struct inet6_ifaddr *ifa;
1337 idev = __in6_dev_get(dev);
1339 read_lock_bh(&idev->lock);
1340 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1341 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1346 read_unlock_bh(&idev->lock);
1352 EXPORT_SYMBOL(ipv6_chk_prefix);
1354 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1355 struct net_device *dev, int strict)
1357 struct inet6_ifaddr *ifp, *result = NULL;
1358 unsigned int hash = ipv6_addr_hash(addr);
1359 struct hlist_node *node;
1362 hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1363 if (!net_eq(dev_net(ifp->idev->dev), net))
1365 if (ipv6_addr_equal(&ifp->addr, addr)) {
1366 if (dev == NULL || ifp->idev->dev == dev ||
1367 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1374 rcu_read_unlock_bh();
1379 /* Gets referenced address, destroys ifaddr */
1381 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1383 if (ifp->flags&IFA_F_PERMANENT) {
1384 spin_lock_bh(&ifp->lock);
1385 addrconf_del_timer(ifp);
1386 ifp->flags |= IFA_F_TENTATIVE;
1388 ifp->flags |= IFA_F_DADFAILED;
1389 spin_unlock_bh(&ifp->lock);
1391 ipv6_ifa_notify(0, ifp);
1393 #ifdef CONFIG_IPV6_PRIVACY
1394 } else if (ifp->flags&IFA_F_TEMPORARY) {
1395 struct inet6_ifaddr *ifpub;
1396 spin_lock_bh(&ifp->lock);
1399 in6_ifa_hold(ifpub);
1400 spin_unlock_bh(&ifp->lock);
1401 ipv6_create_tempaddr(ifpub, ifp);
1404 spin_unlock_bh(&ifp->lock);
1412 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1416 spin_lock(&ifp->state_lock);
1417 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1418 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1421 spin_unlock(&ifp->state_lock);
1426 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1428 struct inet6_dev *idev = ifp->idev;
1430 if (addrconf_dad_end(ifp)) {
1435 if (net_ratelimit())
1436 printk(KERN_INFO "%s: IPv6 duplicate address %pI6c detected!\n",
1437 ifp->idev->dev->name, &ifp->addr);
1439 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1440 struct in6_addr addr;
1442 addr.s6_addr32[0] = htonl(0xfe800000);
1443 addr.s6_addr32[1] = 0;
1445 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1446 ipv6_addr_equal(&ifp->addr, &addr)) {
1447 /* DAD failed for link-local based on MAC address */
1448 idev->cnf.disable_ipv6 = 1;
1450 printk(KERN_INFO "%s: IPv6 being disabled!\n",
1451 ifp->idev->dev->name);
1455 addrconf_dad_stop(ifp, 1);
1458 /* Join to solicited addr multicast group. */
1460 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1462 struct in6_addr maddr;
1464 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1467 addrconf_addr_solict_mult(addr, &maddr);
1468 ipv6_dev_mc_inc(dev, &maddr);
1471 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1473 struct in6_addr maddr;
1475 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1478 addrconf_addr_solict_mult(addr, &maddr);
1479 __ipv6_dev_mc_dec(idev, &maddr);
1482 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1484 struct in6_addr addr;
1485 if (ifp->prefix_len == 127) /* RFC 6164 */
1487 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1488 if (ipv6_addr_any(&addr))
1490 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1493 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1495 struct in6_addr addr;
1496 if (ifp->prefix_len == 127) /* RFC 6164 */
1498 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1499 if (ipv6_addr_any(&addr))
1501 __ipv6_dev_ac_dec(ifp->idev, &addr);
1504 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1506 if (dev->addr_len != ETH_ALEN)
1508 memcpy(eui, dev->dev_addr, 3);
1509 memcpy(eui + 5, dev->dev_addr + 3, 3);
1512 * The zSeries OSA network cards can be shared among various
1513 * OS instances, but the OSA cards have only one MAC address.
1514 * This leads to duplicate address conflicts in conjunction
1515 * with IPv6 if more than one instance uses the same card.
1517 * The driver for these cards can deliver a unique 16-bit
1518 * identifier for each instance sharing the same card. It is
1519 * placed instead of 0xFFFE in the interface identifier. The
1520 * "u" bit of the interface identifier is not inverted in this
1521 * case. Hence the resulting interface identifier has local
1522 * scope according to RFC2373.
1525 eui[3] = (dev->dev_id >> 8) & 0xFF;
1526 eui[4] = dev->dev_id & 0xFF;
1535 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1537 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1538 if (dev->addr_len != ARCNET_ALEN)
1541 eui[7] = *(u8*)dev->dev_addr;
1545 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1547 if (dev->addr_len != INFINIBAND_ALEN)
1549 memcpy(eui, dev->dev_addr + 12, 8);
1554 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1558 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1559 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1560 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1561 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1562 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1563 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1567 memcpy(eui + 4, &addr, 4);
1571 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1573 if (dev->priv_flags & IFF_ISATAP)
1574 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1578 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1580 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1583 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1585 switch (dev->type) {
1588 case ARPHRD_IEEE802_TR:
1589 return addrconf_ifid_eui48(eui, dev);
1591 return addrconf_ifid_arcnet(eui, dev);
1592 case ARPHRD_INFINIBAND:
1593 return addrconf_ifid_infiniband(eui, dev);
1595 return addrconf_ifid_sit(eui, dev);
1597 return addrconf_ifid_gre(eui, dev);
1602 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1605 struct inet6_ifaddr *ifp;
1607 read_lock_bh(&idev->lock);
1608 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1609 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1610 memcpy(eui, ifp->addr.s6_addr+8, 8);
1615 read_unlock_bh(&idev->lock);
1619 #ifdef CONFIG_IPV6_PRIVACY
1620 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1621 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1624 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1625 idev->rndid[0] &= ~0x02;
1628 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1629 * check if generated address is not inappropriate
1631 * - Reserved subnet anycast (RFC 2526)
1632 * 11111101 11....11 1xxxxxxx
1633 * - ISATAP (RFC4214) 6.1
1634 * 00-00-5E-FE-xx-xx-xx-xx
1636 * - XXX: already assigned to an address on the device
1638 if (idev->rndid[0] == 0xfd &&
1639 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1640 (idev->rndid[7]&0x80))
1642 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1643 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1645 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1652 static void ipv6_regen_rndid(unsigned long data)
1654 struct inet6_dev *idev = (struct inet6_dev *) data;
1655 unsigned long expires;
1658 write_lock_bh(&idev->lock);
1663 if (__ipv6_regen_rndid(idev) < 0)
1667 idev->cnf.temp_prefered_lft * HZ -
1668 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1669 idev->cnf.max_desync_factor * HZ;
1670 if (time_before(expires, jiffies)) {
1672 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1677 if (!mod_timer(&idev->regen_timer, expires))
1681 write_unlock_bh(&idev->lock);
1682 rcu_read_unlock_bh();
1686 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1689 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1690 ret = __ipv6_regen_rndid(idev);
1700 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1701 unsigned long expires, u32 flags)
1703 struct fib6_config cfg = {
1704 .fc_table = RT6_TABLE_PREFIX,
1705 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1706 .fc_ifindex = dev->ifindex,
1707 .fc_expires = expires,
1709 .fc_flags = RTF_UP | flags,
1710 .fc_nlinfo.nl_net = dev_net(dev),
1711 .fc_protocol = RTPROT_KERNEL,
1714 ipv6_addr_copy(&cfg.fc_dst, pfx);
1716 /* Prevent useless cloning on PtP SIT.
1717 This thing is done here expecting that the whole
1718 class of non-broadcast devices need not cloning.
1720 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1721 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1722 cfg.fc_flags |= RTF_NONEXTHOP;
1725 ip6_route_add(&cfg);
1729 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
1731 const struct net_device *dev,
1732 u32 flags, u32 noflags)
1734 struct fib6_node *fn;
1735 struct rt6_info *rt = NULL;
1736 struct fib6_table *table;
1738 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
1742 write_lock_bh(&table->tb6_lock);
1743 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
1746 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1747 if (rt->rt6i_dev->ifindex != dev->ifindex)
1749 if ((rt->rt6i_flags & flags) != flags)
1751 if ((rt->rt6i_flags & noflags) != 0)
1757 write_unlock_bh(&table->tb6_lock);
1762 /* Create "default" multicast route to the interface */
1764 static void addrconf_add_mroute(struct net_device *dev)
1766 struct fib6_config cfg = {
1767 .fc_table = RT6_TABLE_LOCAL,
1768 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1769 .fc_ifindex = dev->ifindex,
1772 .fc_nlinfo.nl_net = dev_net(dev),
1775 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1777 ip6_route_add(&cfg);
1780 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1781 static void sit_route_add(struct net_device *dev)
1783 struct fib6_config cfg = {
1784 .fc_table = RT6_TABLE_MAIN,
1785 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1786 .fc_ifindex = dev->ifindex,
1788 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1789 .fc_nlinfo.nl_net = dev_net(dev),
1792 /* prefix length - 96 bits "::d.d.d.d" */
1793 ip6_route_add(&cfg);
1797 static void addrconf_add_lroute(struct net_device *dev)
1799 struct in6_addr addr;
1801 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1802 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1805 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1807 struct inet6_dev *idev;
1811 idev = ipv6_find_idev(dev);
1813 return ERR_PTR(-ENOBUFS);
1815 if (idev->cnf.disable_ipv6)
1816 return ERR_PTR(-EACCES);
1818 /* Add default multicast route */
1819 if (!(dev->flags & IFF_LOOPBACK))
1820 addrconf_add_mroute(dev);
1822 /* Add link local route */
1823 addrconf_add_lroute(dev);
1827 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1829 struct prefix_info *pinfo;
1833 struct inet6_dev *in6_dev;
1834 struct net *net = dev_net(dev);
1836 pinfo = (struct prefix_info *) opt;
1838 if (len < sizeof(struct prefix_info)) {
1839 ADBG(("addrconf: prefix option too short\n"));
1844 * Validation checks ([ADDRCONF], page 19)
1847 addr_type = ipv6_addr_type(&pinfo->prefix);
1849 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1852 valid_lft = ntohl(pinfo->valid);
1853 prefered_lft = ntohl(pinfo->prefered);
1855 if (prefered_lft > valid_lft) {
1856 if (net_ratelimit())
1857 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1861 in6_dev = in6_dev_get(dev);
1863 if (in6_dev == NULL) {
1864 if (net_ratelimit())
1865 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1870 * Two things going on here:
1871 * 1) Add routes for on-link prefixes
1872 * 2) Configure prefixes with the auto flag set
1875 if (pinfo->onlink) {
1876 struct rt6_info *rt;
1877 unsigned long rt_expires;
1879 /* Avoid arithmetic overflow. Really, we could
1880 * save rt_expires in seconds, likely valid_lft,
1881 * but it would require division in fib gc, that it
1885 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1887 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
1889 if (addrconf_finite_timeout(rt_expires))
1892 rt = addrconf_get_prefix_route(&pinfo->prefix,
1895 RTF_ADDRCONF | RTF_PREFIX_RT,
1896 RTF_GATEWAY | RTF_DEFAULT);
1899 /* Autoconf prefix route */
1900 if (valid_lft == 0) {
1903 } else if (addrconf_finite_timeout(rt_expires)) {
1905 rt->rt6i_expires = jiffies + rt_expires;
1906 rt->rt6i_flags |= RTF_EXPIRES;
1908 rt->rt6i_flags &= ~RTF_EXPIRES;
1909 rt->rt6i_expires = 0;
1911 } else if (valid_lft) {
1912 clock_t expires = 0;
1913 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1914 if (addrconf_finite_timeout(rt_expires)) {
1916 flags |= RTF_EXPIRES;
1917 expires = jiffies_to_clock_t(rt_expires);
1919 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1920 dev, expires, flags);
1923 dst_release(&rt->dst);
1926 /* Try to figure out our local address for this prefix */
1928 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1929 struct inet6_ifaddr * ifp;
1930 struct in6_addr addr;
1931 int create = 0, update_lft = 0;
1933 if (pinfo->prefix_len == 64) {
1934 memcpy(&addr, &pinfo->prefix, 8);
1935 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1936 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1937 in6_dev_put(in6_dev);
1942 if (net_ratelimit())
1943 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1945 in6_dev_put(in6_dev);
1950 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1952 if (ifp == NULL && valid_lft) {
1953 int max_addresses = in6_dev->cnf.max_addresses;
1956 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1957 if (in6_dev->cnf.optimistic_dad &&
1958 !net->ipv6.devconf_all->forwarding)
1959 addr_flags = IFA_F_OPTIMISTIC;
1962 /* Do not allow to create too much of autoconfigured
1963 * addresses; this would be too easy way to crash kernel.
1965 if (!max_addresses ||
1966 ipv6_count_addresses(in6_dev) < max_addresses)
1967 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1968 addr_type&IPV6_ADDR_SCOPE_MASK,
1971 if (!ifp || IS_ERR(ifp)) {
1972 in6_dev_put(in6_dev);
1976 update_lft = create = 1;
1977 ifp->cstamp = jiffies;
1978 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1984 #ifdef CONFIG_IPV6_PRIVACY
1985 struct inet6_ifaddr *ift;
1989 /* update lifetime (RFC2462 5.5.3 e) */
1990 spin_lock(&ifp->lock);
1992 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1993 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1996 if (!update_lft && stored_lft) {
1997 if (valid_lft > MIN_VALID_LIFETIME ||
1998 valid_lft > stored_lft)
2000 else if (stored_lft <= MIN_VALID_LIFETIME) {
2001 /* valid_lft <= stored_lft is always true */
2003 * RFC 4862 Section 5.5.3e:
2004 * "Note that the preferred lifetime of
2005 * the corresponding address is always
2006 * reset to the Preferred Lifetime in
2007 * the received Prefix Information
2008 * option, regardless of whether the
2009 * valid lifetime is also reset or
2012 * So if the preferred lifetime in
2013 * this advertisement is different
2014 * than what we have stored, but the
2015 * valid lifetime is invalid, just
2016 * reset prefered_lft.
2018 * We must set the valid lifetime
2019 * to the stored lifetime since we'll
2020 * be updating the timestamp below,
2021 * else we'll set it back to the
2024 if (prefered_lft != ifp->prefered_lft) {
2025 valid_lft = stored_lft;
2029 valid_lft = MIN_VALID_LIFETIME;
2030 if (valid_lft < prefered_lft)
2031 prefered_lft = valid_lft;
2037 ifp->valid_lft = valid_lft;
2038 ifp->prefered_lft = prefered_lft;
2041 ifp->flags &= ~IFA_F_DEPRECATED;
2042 spin_unlock(&ifp->lock);
2044 if (!(flags&IFA_F_TENTATIVE))
2045 ipv6_ifa_notify(0, ifp);
2047 spin_unlock(&ifp->lock);
2049 #ifdef CONFIG_IPV6_PRIVACY
2050 read_lock_bh(&in6_dev->lock);
2051 /* update all temporary addresses in the list */
2052 list_for_each_entry(ift, &in6_dev->tempaddr_list,
2054 int age, max_valid, max_prefered;
2056 if (ifp != ift->ifpub)
2060 * RFC 4941 section 3.3:
2061 * If a received option will extend the lifetime
2062 * of a public address, the lifetimes of
2063 * temporary addresses should be extended,
2064 * subject to the overall constraint that no
2065 * temporary addresses should ever remain
2066 * "valid" or "preferred" for a time longer than
2067 * (TEMP_VALID_LIFETIME) or
2068 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR),
2071 age = (now - ift->cstamp) / HZ;
2072 max_valid = in6_dev->cnf.temp_valid_lft - age;
2076 max_prefered = in6_dev->cnf.temp_prefered_lft -
2077 in6_dev->cnf.max_desync_factor -
2079 if (max_prefered < 0)
2082 if (valid_lft > max_valid)
2083 valid_lft = max_valid;
2085 if (prefered_lft > max_prefered)
2086 prefered_lft = max_prefered;
2088 spin_lock(&ift->lock);
2090 ift->valid_lft = valid_lft;
2091 ift->prefered_lft = prefered_lft;
2093 if (prefered_lft > 0)
2094 ift->flags &= ~IFA_F_DEPRECATED;
2096 spin_unlock(&ift->lock);
2097 if (!(flags&IFA_F_TENTATIVE))
2098 ipv6_ifa_notify(0, ift);
2101 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
2103 * When a new public address is created as
2104 * described in [ADDRCONF], also create a new
2105 * temporary address. Also create a temporary
2106 * address if it's enabled but no temporary
2107 * address currently exists.
2109 read_unlock_bh(&in6_dev->lock);
2110 ipv6_create_tempaddr(ifp, NULL);
2112 read_unlock_bh(&in6_dev->lock);
2119 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2120 in6_dev_put(in6_dev);
2124 * Set destination address.
2125 * Special case for SIT interfaces where we create a new "virtual"
2128 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2130 struct in6_ifreq ireq;
2131 struct net_device *dev;
2137 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2140 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2146 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2147 if (dev->type == ARPHRD_SIT) {
2148 const struct net_device_ops *ops = dev->netdev_ops;
2150 struct ip_tunnel_parm p;
2152 err = -EADDRNOTAVAIL;
2153 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2156 memset(&p, 0, sizeof(p));
2157 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2161 p.iph.protocol = IPPROTO_IPV6;
2163 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2165 if (ops->ndo_do_ioctl) {
2166 mm_segment_t oldfs = get_fs();
2169 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2176 dev = __dev_get_by_name(net, p.name);
2179 err = dev_open(dev);
2190 * Manual configuration of address on an interface
2192 static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx,
2193 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2196 struct inet6_ifaddr *ifp;
2197 struct inet6_dev *idev;
2198 struct net_device *dev;
2202 unsigned long timeout;
2209 /* check the lifetime */
2210 if (!valid_lft || prefered_lft > valid_lft)
2213 dev = __dev_get_by_index(net, ifindex);
2217 idev = addrconf_add_dev(dev);
2219 return PTR_ERR(idev);
2221 scope = ipv6_addr_scope(pfx);
2223 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2224 if (addrconf_finite_timeout(timeout)) {
2225 expires = jiffies_to_clock_t(timeout * HZ);
2226 valid_lft = timeout;
2227 flags = RTF_EXPIRES;
2231 ifa_flags |= IFA_F_PERMANENT;
2234 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2235 if (addrconf_finite_timeout(timeout)) {
2237 ifa_flags |= IFA_F_DEPRECATED;
2238 prefered_lft = timeout;
2241 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2244 spin_lock_bh(&ifp->lock);
2245 ifp->valid_lft = valid_lft;
2246 ifp->prefered_lft = prefered_lft;
2247 ifp->tstamp = jiffies;
2248 spin_unlock_bh(&ifp->lock);
2250 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2253 * Note that section 3.1 of RFC 4429 indicates
2254 * that the Optimistic flag should not be set for
2255 * manually configured addresses
2257 addrconf_dad_start(ifp, 0);
2263 return PTR_ERR(ifp);
2266 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
2269 struct inet6_ifaddr *ifp;
2270 struct inet6_dev *idev;
2271 struct net_device *dev;
2276 dev = __dev_get_by_index(net, ifindex);
2280 if ((idev = __in6_dev_get(dev)) == NULL)
2283 read_lock_bh(&idev->lock);
2284 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2285 if (ifp->prefix_len == plen &&
2286 ipv6_addr_equal(pfx, &ifp->addr)) {
2288 read_unlock_bh(&idev->lock);
2292 /* If the last address is deleted administratively,
2293 disable IPv6 on this interface.
2295 if (list_empty(&idev->addr_list))
2296 addrconf_ifdown(idev->dev, 1);
2300 read_unlock_bh(&idev->lock);
2301 return -EADDRNOTAVAIL;
2305 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2307 struct in6_ifreq ireq;
2310 if (!capable(CAP_NET_ADMIN))
2313 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2317 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2318 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2319 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2324 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2326 struct in6_ifreq ireq;
2329 if (!capable(CAP_NET_ADMIN))
2332 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2336 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2337 ireq.ifr6_prefixlen);
2342 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2343 int plen, int scope)
2345 struct inet6_ifaddr *ifp;
2347 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2349 spin_lock_bh(&ifp->lock);
2350 ifp->flags &= ~IFA_F_TENTATIVE;
2351 spin_unlock_bh(&ifp->lock);
2352 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2357 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2358 static void sit_add_v4_addrs(struct inet6_dev *idev)
2360 struct in6_addr addr;
2361 struct net_device *dev;
2362 struct net *net = dev_net(idev->dev);
2367 memset(&addr, 0, sizeof(struct in6_addr));
2368 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2370 if (idev->dev->flags&IFF_POINTOPOINT) {
2371 addr.s6_addr32[0] = htonl(0xfe800000);
2374 scope = IPV6_ADDR_COMPATv4;
2377 if (addr.s6_addr32[3]) {
2378 add_addr(idev, &addr, 128, scope);
2382 for_each_netdev(net, dev) {
2383 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2384 if (in_dev && (dev->flags & IFF_UP)) {
2385 struct in_ifaddr * ifa;
2389 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2392 addr.s6_addr32[3] = ifa->ifa_local;
2394 if (ifa->ifa_scope == RT_SCOPE_LINK)
2396 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2397 if (idev->dev->flags&IFF_POINTOPOINT)
2401 if (idev->dev->flags&IFF_POINTOPOINT)
2406 add_addr(idev, &addr, plen, flag);
2413 static void init_loopback(struct net_device *dev)
2415 struct inet6_dev *idev;
2416 struct net_device *sp_dev;
2417 struct inet6_ifaddr *sp_ifa;
2418 struct rt6_info *sp_rt;
2424 if ((idev = ipv6_find_idev(dev)) == NULL) {
2425 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2429 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2431 /* Add routes to other interface's IPv6 addresses */
2432 for_each_netdev(dev_net(dev), sp_dev) {
2433 if (!strcmp(sp_dev->name, dev->name))
2436 idev = __in6_dev_get(sp_dev);
2440 read_lock_bh(&idev->lock);
2441 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2443 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2449 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, 0);
2451 /* Failure cases are ignored */
2452 if (!IS_ERR(sp_rt)) {
2457 read_unlock_bh(&idev->lock);
2461 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
2463 struct inet6_ifaddr * ifp;
2464 u32 addr_flags = IFA_F_PERMANENT;
2466 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2467 if (idev->cnf.optimistic_dad &&
2468 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2469 addr_flags |= IFA_F_OPTIMISTIC;
2473 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2475 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2476 addrconf_dad_start(ifp, 0);
2481 static void addrconf_dev_config(struct net_device *dev)
2483 struct in6_addr addr;
2484 struct inet6_dev * idev;
2488 if ((dev->type != ARPHRD_ETHER) &&
2489 (dev->type != ARPHRD_FDDI) &&
2490 (dev->type != ARPHRD_IEEE802_TR) &&
2491 (dev->type != ARPHRD_ARCNET) &&
2492 (dev->type != ARPHRD_INFINIBAND)) {
2493 /* Alas, we support only Ethernet autoconfiguration. */
2497 idev = addrconf_add_dev(dev);
2501 memset(&addr, 0, sizeof(struct in6_addr));
2502 addr.s6_addr32[0] = htonl(0xFE800000);
2504 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2505 addrconf_add_linklocal(idev, &addr);
2508 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2509 static void addrconf_sit_config(struct net_device *dev)
2511 struct inet6_dev *idev;
2516 * Configure the tunnel with one of our IPv4
2517 * addresses... we should configure all of
2518 * our v4 addrs in the tunnel
2521 if ((idev = ipv6_find_idev(dev)) == NULL) {
2522 printk(KERN_DEBUG "init sit: add_dev failed\n");
2526 if (dev->priv_flags & IFF_ISATAP) {
2527 struct in6_addr addr;
2529 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2530 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2531 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2532 addrconf_add_linklocal(idev, &addr);
2536 sit_add_v4_addrs(idev);
2538 if (dev->flags&IFF_POINTOPOINT) {
2539 addrconf_add_mroute(dev);
2540 addrconf_add_lroute(dev);
2546 #if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE)
2547 static void addrconf_gre_config(struct net_device *dev)
2549 struct inet6_dev *idev;
2550 struct in6_addr addr;
2552 pr_info("ipv6: addrconf_gre_config(%s)\n", dev->name);
2556 if ((idev = ipv6_find_idev(dev)) == NULL) {
2557 printk(KERN_DEBUG "init gre: add_dev failed\n");
2561 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2562 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2564 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2565 addrconf_add_linklocal(idev, &addr);
2570 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2572 struct in6_addr lladdr;
2574 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2575 addrconf_add_linklocal(idev, &lladdr);
2581 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2583 struct net_device *link_dev;
2584 struct net *net = dev_net(idev->dev);
2586 /* first try to inherit the link-local address from the link device */
2587 if (idev->dev->iflink &&
2588 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2589 if (!ipv6_inherit_linklocal(idev, link_dev))
2592 /* then try to inherit it from any device */
2593 for_each_netdev(net, link_dev) {
2594 if (!ipv6_inherit_linklocal(idev, link_dev))
2597 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2601 * Autoconfigure tunnel with a link-local address so routing protocols,
2602 * DHCPv6, MLD etc. can be run over the virtual link
2605 static void addrconf_ip6_tnl_config(struct net_device *dev)
2607 struct inet6_dev *idev;
2611 idev = addrconf_add_dev(dev);
2613 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2616 ip6_tnl_add_linklocal(idev);
2619 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2622 struct net_device *dev = (struct net_device *) data;
2623 struct inet6_dev *idev = __in6_dev_get(dev);
2624 int run_pending = 0;
2628 case NETDEV_REGISTER:
2629 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2630 idev = ipv6_add_dev(dev);
2632 return notifier_from_errno(-ENOMEM);
2638 if (dev->flags & IFF_SLAVE)
2641 if (event == NETDEV_UP) {
2642 if (!addrconf_qdisc_ok(dev)) {
2643 /* device is not ready yet. */
2645 "ADDRCONF(NETDEV_UP): %s: "
2646 "link is not ready\n",
2651 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2652 idev = ipv6_add_dev(dev);
2655 idev->if_flags |= IF_READY;
2659 if (!addrconf_qdisc_ok(dev)) {
2660 /* device is still not ready. */
2665 if (idev->if_flags & IF_READY)
2666 /* device is already configured. */
2668 idev->if_flags |= IF_READY;
2672 "ADDRCONF(NETDEV_CHANGE): %s: "
2673 "link becomes ready\n",
2679 switch (dev->type) {
2680 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2682 addrconf_sit_config(dev);
2685 #if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE)
2687 addrconf_gre_config(dev);
2690 case ARPHRD_TUNNEL6:
2691 addrconf_ip6_tnl_config(dev);
2693 case ARPHRD_LOOPBACK:
2698 addrconf_dev_config(dev);
2704 addrconf_dad_run(idev);
2707 * If the MTU changed during the interface down,
2708 * when the interface up, the changed MTU must be
2709 * reflected in the idev as well as routers.
2711 if (idev->cnf.mtu6 != dev->mtu &&
2712 dev->mtu >= IPV6_MIN_MTU) {
2713 rt6_mtu_change(dev, dev->mtu);
2714 idev->cnf.mtu6 = dev->mtu;
2716 idev->tstamp = jiffies;
2717 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2720 * If the changed mtu during down is lower than
2721 * IPV6_MIN_MTU stop IPv6 on this interface.
2723 if (dev->mtu < IPV6_MIN_MTU)
2724 addrconf_ifdown(dev, 1);
2728 case NETDEV_CHANGEMTU:
2729 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2730 rt6_mtu_change(dev, dev->mtu);
2731 idev->cnf.mtu6 = dev->mtu;
2735 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2736 idev = ipv6_add_dev(dev);
2742 * MTU falled under IPV6_MIN_MTU.
2743 * Stop IPv6 on this interface.
2747 case NETDEV_UNREGISTER:
2749 * Remove all addresses from this interface.
2751 addrconf_ifdown(dev, event != NETDEV_DOWN);
2754 case NETDEV_CHANGENAME:
2756 snmp6_unregister_dev(idev);
2757 addrconf_sysctl_unregister(idev);
2758 addrconf_sysctl_register(idev);
2759 err = snmp6_register_dev(idev);
2761 return notifier_from_errno(err);
2765 case NETDEV_PRE_TYPE_CHANGE:
2766 case NETDEV_POST_TYPE_CHANGE:
2767 addrconf_type_change(dev, event);
2775 * addrconf module should be notified of a device going up
2777 static struct notifier_block ipv6_dev_notf = {
2778 .notifier_call = addrconf_notify,
2781 static void addrconf_type_change(struct net_device *dev, unsigned long event)
2783 struct inet6_dev *idev;
2786 idev = __in6_dev_get(dev);
2788 if (event == NETDEV_POST_TYPE_CHANGE)
2789 ipv6_mc_remap(idev);
2790 else if (event == NETDEV_PRE_TYPE_CHANGE)
2791 ipv6_mc_unmap(idev);
2794 static int addrconf_ifdown(struct net_device *dev, int how)
2796 struct net *net = dev_net(dev);
2797 struct inet6_dev *idev;
2798 struct inet6_ifaddr *ifa;
2803 rt6_ifdown(net, dev);
2804 neigh_ifdown(&nd_tbl, dev);
2806 idev = __in6_dev_get(dev);
2811 * Step 1: remove reference to ipv6 device from parent device.
2817 /* protected by rtnl_lock */
2818 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
2820 /* Step 1.5: remove snmp6 entry */
2821 snmp6_unregister_dev(idev);
2825 /* Step 2: clear hash table */
2826 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
2827 struct hlist_head *h = &inet6_addr_lst[i];
2828 struct hlist_node *n;
2830 spin_lock_bh(&addrconf_hash_lock);
2832 hlist_for_each_entry_rcu(ifa, n, h, addr_lst) {
2833 if (ifa->idev == idev) {
2834 hlist_del_init_rcu(&ifa->addr_lst);
2835 addrconf_del_timer(ifa);
2839 spin_unlock_bh(&addrconf_hash_lock);
2842 write_lock_bh(&idev->lock);
2844 /* Step 2: clear flags for stateless addrconf */
2846 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2848 #ifdef CONFIG_IPV6_PRIVACY
2849 if (how && del_timer(&idev->regen_timer))
2852 /* Step 3: clear tempaddr list */
2853 while (!list_empty(&idev->tempaddr_list)) {
2854 ifa = list_first_entry(&idev->tempaddr_list,
2855 struct inet6_ifaddr, tmp_list);
2856 list_del(&ifa->tmp_list);
2857 write_unlock_bh(&idev->lock);
2858 spin_lock_bh(&ifa->lock);
2861 in6_ifa_put(ifa->ifpub);
2864 spin_unlock_bh(&ifa->lock);
2866 write_lock_bh(&idev->lock);
2870 while (!list_empty(&idev->addr_list)) {
2871 ifa = list_first_entry(&idev->addr_list,
2872 struct inet6_ifaddr, if_list);
2873 addrconf_del_timer(ifa);
2875 list_del(&ifa->if_list);
2877 write_unlock_bh(&idev->lock);
2879 spin_lock_bh(&ifa->state_lock);
2881 ifa->state = INET6_IFADDR_STATE_DEAD;
2882 spin_unlock_bh(&ifa->state_lock);
2884 if (state != INET6_IFADDR_STATE_DEAD) {
2885 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2886 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2890 write_lock_bh(&idev->lock);
2893 write_unlock_bh(&idev->lock);
2895 /* Step 5: Discard multicast list */
2897 ipv6_mc_destroy_dev(idev);
2901 idev->tstamp = jiffies;
2903 /* Last: Shot the device (if unregistered) */
2905 addrconf_sysctl_unregister(idev);
2906 neigh_parms_release(&nd_tbl, idev->nd_parms);
2907 neigh_ifdown(&nd_tbl, dev);
2913 static void addrconf_rs_timer(unsigned long data)
2915 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2916 struct inet6_dev *idev = ifp->idev;
2918 read_lock(&idev->lock);
2919 if (idev->dead || !(idev->if_flags & IF_READY))
2922 if (idev->cnf.forwarding)
2925 /* Announcement received after solicitation was sent */
2926 if (idev->if_flags & IF_RA_RCVD)
2929 spin_lock(&ifp->lock);
2930 if (ifp->probes++ < idev->cnf.rtr_solicits) {
2931 /* The wait after the last probe can be shorter */
2932 addrconf_mod_timer(ifp, AC_RS,
2933 (ifp->probes == idev->cnf.rtr_solicits) ?
2934 idev->cnf.rtr_solicit_delay :
2935 idev->cnf.rtr_solicit_interval);
2936 spin_unlock(&ifp->lock);
2938 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2940 spin_unlock(&ifp->lock);
2942 * Note: we do not support deprecated "all on-link"
2943 * assumption any longer.
2945 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2950 read_unlock(&idev->lock);
2955 * Duplicate Address Detection
2957 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2959 unsigned long rand_num;
2960 struct inet6_dev *idev = ifp->idev;
2962 if (ifp->flags & IFA_F_OPTIMISTIC)
2965 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2967 ifp->probes = idev->cnf.dad_transmits;
2968 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2971 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2973 struct inet6_dev *idev = ifp->idev;
2974 struct net_device *dev = idev->dev;
2976 addrconf_join_solict(dev, &ifp->addr);
2978 net_srandom(ifp->addr.s6_addr32[3]);
2980 read_lock_bh(&idev->lock);
2981 spin_lock(&ifp->lock);
2982 if (ifp->state == INET6_IFADDR_STATE_DEAD)
2985 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2986 idev->cnf.accept_dad < 1 ||
2987 !(ifp->flags&IFA_F_TENTATIVE) ||
2988 ifp->flags & IFA_F_NODAD) {
2989 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2990 spin_unlock(&ifp->lock);
2991 read_unlock_bh(&idev->lock);
2993 addrconf_dad_completed(ifp);
2997 if (!(idev->if_flags & IF_READY)) {
2998 spin_unlock(&ifp->lock);
2999 read_unlock_bh(&idev->lock);
3001 * If the device is not ready:
3002 * - keep it tentative if it is a permanent address.
3003 * - otherwise, kill it.
3006 addrconf_dad_stop(ifp, 0);
3011 * Optimistic nodes can start receiving
3014 if (ifp->flags & IFA_F_OPTIMISTIC)
3015 ip6_ins_rt(ifp->rt);
3017 addrconf_dad_kick(ifp);
3019 spin_unlock(&ifp->lock);
3020 read_unlock_bh(&idev->lock);
3023 static void addrconf_dad_timer(unsigned long data)
3025 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
3026 struct inet6_dev *idev = ifp->idev;
3027 struct in6_addr mcaddr;
3029 if (!ifp->probes && addrconf_dad_end(ifp))
3032 read_lock(&idev->lock);
3033 if (idev->dead || !(idev->if_flags & IF_READY)) {
3034 read_unlock(&idev->lock);
3038 spin_lock(&ifp->lock);
3039 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3040 spin_unlock(&ifp->lock);
3041 read_unlock(&idev->lock);
3045 if (ifp->probes == 0) {
3047 * DAD was successful
3050 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3051 spin_unlock(&ifp->lock);
3052 read_unlock(&idev->lock);
3054 addrconf_dad_completed(ifp);
3060 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
3061 spin_unlock(&ifp->lock);
3062 read_unlock(&idev->lock);
3064 /* send a neighbour solicitation for our addr */
3065 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3066 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
3071 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3073 struct net_device *dev = ifp->idev->dev;
3076 * Configure the address for reception. Now it is valid.
3079 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3081 /* If added prefix is link local and we are prepared to process
3082 router advertisements, start sending router solicitations.
3085 if (((ifp->idev->cnf.accept_ra == 1 && !ifp->idev->cnf.forwarding) ||
3086 ifp->idev->cnf.accept_ra == 2) &&
3087 ifp->idev->cnf.rtr_solicits > 0 &&
3088 (dev->flags&IFF_LOOPBACK) == 0 &&
3089 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
3091 * If a host as already performed a random delay
3092 * [...] as part of DAD [...] there is no need
3093 * to delay again before sending the first RS
3095 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
3097 spin_lock_bh(&ifp->lock);
3099 ifp->idev->if_flags |= IF_RS_SENT;
3100 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
3101 spin_unlock_bh(&ifp->lock);
3105 static void addrconf_dad_run(struct inet6_dev *idev)
3107 struct inet6_ifaddr *ifp;
3109 read_lock_bh(&idev->lock);
3110 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3111 spin_lock(&ifp->lock);
3112 if (ifp->flags & IFA_F_TENTATIVE &&
3113 ifp->state == INET6_IFADDR_STATE_DAD)
3114 addrconf_dad_kick(ifp);
3115 spin_unlock(&ifp->lock);
3117 read_unlock_bh(&idev->lock);
3120 #ifdef CONFIG_PROC_FS
3121 struct if6_iter_state {
3122 struct seq_net_private p;
3126 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
3128 struct inet6_ifaddr *ifa = NULL;
3129 struct if6_iter_state *state = seq->private;
3130 struct net *net = seq_file_net(seq);
3132 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3133 struct hlist_node *n;
3134 hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket],
3136 if (net_eq(dev_net(ifa->idev->dev), net))
3142 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3143 struct inet6_ifaddr *ifa)
3145 struct if6_iter_state *state = seq->private;
3146 struct net *net = seq_file_net(seq);
3147 struct hlist_node *n = &ifa->addr_lst;
3149 hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst)
3150 if (net_eq(dev_net(ifa->idev->dev), net))
3153 while (++state->bucket < IN6_ADDR_HSIZE) {
3154 hlist_for_each_entry_rcu_bh(ifa, n,
3155 &inet6_addr_lst[state->bucket], addr_lst) {
3156 if (net_eq(dev_net(ifa->idev->dev), net))
3164 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
3166 struct inet6_ifaddr *ifa = if6_get_first(seq);
3169 while (pos && (ifa = if6_get_next(seq, ifa)) != NULL)
3171 return pos ? NULL : ifa;
3174 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3178 return if6_get_idx(seq, *pos);
3181 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3183 struct inet6_ifaddr *ifa;
3185 ifa = if6_get_next(seq, v);
3190 static void if6_seq_stop(struct seq_file *seq, void *v)
3193 rcu_read_unlock_bh();
3196 static int if6_seq_show(struct seq_file *seq, void *v)
3198 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3199 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3201 ifp->idev->dev->ifindex,
3205 ifp->idev->dev->name);
3209 static const struct seq_operations if6_seq_ops = {
3210 .start = if6_seq_start,
3211 .next = if6_seq_next,
3212 .show = if6_seq_show,
3213 .stop = if6_seq_stop,
3216 static int if6_seq_open(struct inode *inode, struct file *file)
3218 return seq_open_net(inode, file, &if6_seq_ops,
3219 sizeof(struct if6_iter_state));
3222 static const struct file_operations if6_fops = {
3223 .owner = THIS_MODULE,
3224 .open = if6_seq_open,
3226 .llseek = seq_lseek,
3227 .release = seq_release_net,
3230 static int __net_init if6_proc_net_init(struct net *net)
3232 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
3237 static void __net_exit if6_proc_net_exit(struct net *net)
3239 proc_net_remove(net, "if_inet6");
3242 static struct pernet_operations if6_proc_net_ops = {
3243 .init = if6_proc_net_init,
3244 .exit = if6_proc_net_exit,
3247 int __init if6_proc_init(void)
3249 return register_pernet_subsys(&if6_proc_net_ops);
3252 void if6_proc_exit(void)
3254 unregister_pernet_subsys(&if6_proc_net_ops);
3256 #endif /* CONFIG_PROC_FS */
3258 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3259 /* Check if address is a home address configured on any interface. */
3260 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3263 struct inet6_ifaddr *ifp = NULL;
3264 struct hlist_node *n;
3265 unsigned int hash = ipv6_addr_hash(addr);
3268 hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) {
3269 if (!net_eq(dev_net(ifp->idev->dev), net))
3271 if (ipv6_addr_equal(&ifp->addr, addr) &&
3272 (ifp->flags & IFA_F_HOMEADDRESS)) {
3277 rcu_read_unlock_bh();
3283 * Periodic address status verification
3286 static void addrconf_verify(unsigned long foo)
3288 unsigned long now, next, next_sec, next_sched;
3289 struct inet6_ifaddr *ifp;
3290 struct hlist_node *node;
3294 spin_lock(&addrconf_verify_lock);
3296 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3298 del_timer(&addr_chk_timer);
3300 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3302 hlist_for_each_entry_rcu_bh(ifp, node,
3303 &inet6_addr_lst[i], addr_lst) {
3306 if (ifp->flags & IFA_F_PERMANENT)
3309 spin_lock(&ifp->lock);
3310 /* We try to batch several events at once. */
3311 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3313 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3314 age >= ifp->valid_lft) {
3315 spin_unlock(&ifp->lock);
3319 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3320 spin_unlock(&ifp->lock);
3322 } else if (age >= ifp->prefered_lft) {
3323 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3326 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3328 ifp->flags |= IFA_F_DEPRECATED;
3331 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3332 next = ifp->tstamp + ifp->valid_lft * HZ;
3334 spin_unlock(&ifp->lock);
3339 ipv6_ifa_notify(0, ifp);
3343 #ifdef CONFIG_IPV6_PRIVACY
3344 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3345 !(ifp->flags&IFA_F_TENTATIVE)) {
3346 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3347 ifp->idev->cnf.dad_transmits *
3348 ifp->idev->nd_parms->retrans_time / HZ;
3350 if (age >= ifp->prefered_lft - regen_advance) {
3351 struct inet6_ifaddr *ifpub = ifp->ifpub;
3352 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3353 next = ifp->tstamp + ifp->prefered_lft * HZ;
3354 if (!ifp->regen_count && ifpub) {
3357 in6_ifa_hold(ifpub);
3358 spin_unlock(&ifp->lock);
3360 spin_lock(&ifpub->lock);
3361 ifpub->regen_count = 0;
3362 spin_unlock(&ifpub->lock);
3363 ipv6_create_tempaddr(ifpub, ifp);
3368 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3369 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3370 spin_unlock(&ifp->lock);
3373 /* ifp->prefered_lft <= ifp->valid_lft */
3374 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3375 next = ifp->tstamp + ifp->prefered_lft * HZ;
3376 spin_unlock(&ifp->lock);
3381 next_sec = round_jiffies_up(next);
3384 /* If rounded timeout is accurate enough, accept it. */
3385 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3386 next_sched = next_sec;
3388 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3389 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3390 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3392 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3393 now, next, next_sec, next_sched));
3395 addr_chk_timer.expires = next_sched;
3396 add_timer(&addr_chk_timer);
3397 spin_unlock(&addrconf_verify_lock);
3398 rcu_read_unlock_bh();
3401 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3403 struct in6_addr *pfx = NULL;
3406 pfx = nla_data(addr);
3409 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3412 pfx = nla_data(local);
3418 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3419 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3420 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3421 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3425 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3427 struct net *net = sock_net(skb->sk);
3428 struct ifaddrmsg *ifm;
3429 struct nlattr *tb[IFA_MAX+1];
3430 struct in6_addr *pfx;
3433 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3437 ifm = nlmsg_data(nlh);
3438 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3442 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3445 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3446 u32 prefered_lft, u32 valid_lft)
3450 unsigned long timeout;
3452 if (!valid_lft || (prefered_lft > valid_lft))
3455 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3456 if (addrconf_finite_timeout(timeout)) {
3457 expires = jiffies_to_clock_t(timeout * HZ);
3458 valid_lft = timeout;
3459 flags = RTF_EXPIRES;
3463 ifa_flags |= IFA_F_PERMANENT;
3466 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3467 if (addrconf_finite_timeout(timeout)) {
3469 ifa_flags |= IFA_F_DEPRECATED;
3470 prefered_lft = timeout;
3473 spin_lock_bh(&ifp->lock);
3474 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3475 ifp->tstamp = jiffies;
3476 ifp->valid_lft = valid_lft;
3477 ifp->prefered_lft = prefered_lft;
3479 spin_unlock_bh(&ifp->lock);
3480 if (!(ifp->flags&IFA_F_TENTATIVE))
3481 ipv6_ifa_notify(0, ifp);
3483 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3491 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3493 struct net *net = sock_net(skb->sk);
3494 struct ifaddrmsg *ifm;
3495 struct nlattr *tb[IFA_MAX+1];
3496 struct in6_addr *pfx;
3497 struct inet6_ifaddr *ifa;
3498 struct net_device *dev;
3499 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3503 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3507 ifm = nlmsg_data(nlh);
3508 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3512 if (tb[IFA_CACHEINFO]) {
3513 struct ifa_cacheinfo *ci;
3515 ci = nla_data(tb[IFA_CACHEINFO]);
3516 valid_lft = ci->ifa_valid;
3517 preferred_lft = ci->ifa_prefered;
3519 preferred_lft = INFINITY_LIFE_TIME;
3520 valid_lft = INFINITY_LIFE_TIME;
3523 dev = __dev_get_by_index(net, ifm->ifa_index);
3527 /* We ignore other flags so far. */
3528 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3530 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3533 * It would be best to check for !NLM_F_CREATE here but
3534 * userspace alreay relies on not having to provide this.
3536 return inet6_addr_add(net, ifm->ifa_index, pfx,
3537 ifm->ifa_prefixlen, ifa_flags,
3538 preferred_lft, valid_lft);
3541 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3542 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3545 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3552 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3553 u8 scope, int ifindex)
3555 struct ifaddrmsg *ifm;
3557 ifm = nlmsg_data(nlh);
3558 ifm->ifa_family = AF_INET6;
3559 ifm->ifa_prefixlen = prefixlen;
3560 ifm->ifa_flags = flags;
3561 ifm->ifa_scope = scope;
3562 ifm->ifa_index = ifindex;
3565 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3566 unsigned long tstamp, u32 preferred, u32 valid)
3568 struct ifa_cacheinfo ci;
3570 ci.cstamp = cstamp_delta(cstamp);
3571 ci.tstamp = cstamp_delta(tstamp);
3572 ci.ifa_prefered = preferred;
3573 ci.ifa_valid = valid;
3575 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3578 static inline int rt_scope(int ifa_scope)
3580 if (ifa_scope & IFA_HOST)
3581 return RT_SCOPE_HOST;
3582 else if (ifa_scope & IFA_LINK)
3583 return RT_SCOPE_LINK;
3584 else if (ifa_scope & IFA_SITE)
3585 return RT_SCOPE_SITE;
3587 return RT_SCOPE_UNIVERSE;
3590 static inline int inet6_ifaddr_msgsize(void)
3592 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3593 + nla_total_size(16) /* IFA_ADDRESS */
3594 + nla_total_size(sizeof(struct ifa_cacheinfo));
3597 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3598 u32 pid, u32 seq, int event, unsigned int flags)
3600 struct nlmsghdr *nlh;
3601 u32 preferred, valid;
3603 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3607 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3608 ifa->idev->dev->ifindex);
3610 if (!(ifa->flags&IFA_F_PERMANENT)) {
3611 preferred = ifa->prefered_lft;
3612 valid = ifa->valid_lft;
3613 if (preferred != INFINITY_LIFE_TIME) {
3614 long tval = (jiffies - ifa->tstamp)/HZ;
3615 if (preferred > tval)
3619 if (valid != INFINITY_LIFE_TIME) {
3627 preferred = INFINITY_LIFE_TIME;
3628 valid = INFINITY_LIFE_TIME;
3631 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3632 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3633 nlmsg_cancel(skb, nlh);
3637 return nlmsg_end(skb, nlh);
3640 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3641 u32 pid, u32 seq, int event, u16 flags)
3643 struct nlmsghdr *nlh;
3644 u8 scope = RT_SCOPE_UNIVERSE;
3645 int ifindex = ifmca->idev->dev->ifindex;
3647 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3648 scope = RT_SCOPE_SITE;
3650 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3654 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3655 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3656 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3657 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3658 nlmsg_cancel(skb, nlh);
3662 return nlmsg_end(skb, nlh);
3665 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3666 u32 pid, u32 seq, int event, unsigned int flags)
3668 struct nlmsghdr *nlh;
3669 u8 scope = RT_SCOPE_UNIVERSE;
3670 int ifindex = ifaca->aca_idev->dev->ifindex;
3672 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3673 scope = RT_SCOPE_SITE;
3675 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3679 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3680 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3681 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3682 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3683 nlmsg_cancel(skb, nlh);
3687 return nlmsg_end(skb, nlh);
3696 /* called with rcu_read_lock() */
3697 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3698 struct netlink_callback *cb, enum addr_type_t type,
3699 int s_ip_idx, int *p_ip_idx)
3701 struct ifmcaddr6 *ifmca;
3702 struct ifacaddr6 *ifaca;
3704 int ip_idx = *p_ip_idx;
3706 read_lock_bh(&idev->lock);
3708 case UNICAST_ADDR: {
3709 struct inet6_ifaddr *ifa;
3711 /* unicast address incl. temp addr */
3712 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3713 if (++ip_idx < s_ip_idx)
3715 err = inet6_fill_ifaddr(skb, ifa,
3716 NETLINK_CB(cb->skb).pid,
3725 case MULTICAST_ADDR:
3726 /* multicast address */
3727 for (ifmca = idev->mc_list; ifmca;
3728 ifmca = ifmca->next, ip_idx++) {
3729 if (ip_idx < s_ip_idx)
3731 err = inet6_fill_ifmcaddr(skb, ifmca,
3732 NETLINK_CB(cb->skb).pid,
3741 /* anycast address */
3742 for (ifaca = idev->ac_list; ifaca;
3743 ifaca = ifaca->aca_next, ip_idx++) {
3744 if (ip_idx < s_ip_idx)
3746 err = inet6_fill_ifacaddr(skb, ifaca,
3747 NETLINK_CB(cb->skb).pid,
3758 read_unlock_bh(&idev->lock);
3763 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3764 enum addr_type_t type)
3766 struct net *net = sock_net(skb->sk);
3769 int s_idx, s_ip_idx;
3770 struct net_device *dev;
3771 struct inet6_dev *idev;
3772 struct hlist_head *head;
3773 struct hlist_node *node;
3776 s_idx = idx = cb->args[1];
3777 s_ip_idx = ip_idx = cb->args[2];
3780 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3782 head = &net->dev_index_head[h];
3783 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3786 if (h > s_h || idx > s_idx)
3789 idev = __in6_dev_get(dev);
3793 if (in6_dump_addrs(idev, skb, cb, type,
3794 s_ip_idx, &ip_idx) <= 0)
3804 cb->args[2] = ip_idx;
3809 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3811 enum addr_type_t type = UNICAST_ADDR;
3813 return inet6_dump_addr(skb, cb, type);
3816 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3818 enum addr_type_t type = MULTICAST_ADDR;
3820 return inet6_dump_addr(skb, cb, type);
3824 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3826 enum addr_type_t type = ANYCAST_ADDR;
3828 return inet6_dump_addr(skb, cb, type);
3831 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3834 struct net *net = sock_net(in_skb->sk);
3835 struct ifaddrmsg *ifm;
3836 struct nlattr *tb[IFA_MAX+1];
3837 struct in6_addr *addr = NULL;
3838 struct net_device *dev = NULL;
3839 struct inet6_ifaddr *ifa;
3840 struct sk_buff *skb;
3843 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3847 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3853 ifm = nlmsg_data(nlh);
3855 dev = __dev_get_by_index(net, ifm->ifa_index);
3857 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
3859 err = -EADDRNOTAVAIL;
3863 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
3869 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3870 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3872 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3873 WARN_ON(err == -EMSGSIZE);
3877 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
3884 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3886 struct sk_buff *skb;
3887 struct net *net = dev_net(ifa->idev->dev);
3890 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3894 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3896 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3897 WARN_ON(err == -EMSGSIZE);
3901 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3905 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3908 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3909 __s32 *array, int bytes)
3911 BUG_ON(bytes < (DEVCONF_MAX * 4));
3913 memset(array, 0, bytes);
3914 array[DEVCONF_FORWARDING] = cnf->forwarding;
3915 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3916 array[DEVCONF_MTU6] = cnf->mtu6;
3917 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3918 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3919 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3920 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3921 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3922 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
3923 jiffies_to_msecs(cnf->rtr_solicit_interval);
3924 array[DEVCONF_RTR_SOLICIT_DELAY] =
3925 jiffies_to_msecs(cnf->rtr_solicit_delay);
3926 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3927 #ifdef CONFIG_IPV6_PRIVACY
3928 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3929 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3930 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3931 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3932 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3934 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3935 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3936 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3937 #ifdef CONFIG_IPV6_ROUTER_PREF
3938 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3939 array[DEVCONF_RTR_PROBE_INTERVAL] =
3940 jiffies_to_msecs(cnf->rtr_probe_interval);
3941 #ifdef CONFIG_IPV6_ROUTE_INFO
3942 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3945 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3946 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3947 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3948 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3950 #ifdef CONFIG_IPV6_MROUTE
3951 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3953 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
3954 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
3955 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
3958 static inline size_t inet6_ifla6_size(void)
3960 return nla_total_size(4) /* IFLA_INET6_FLAGS */
3961 + nla_total_size(sizeof(struct ifla_cacheinfo))
3962 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3963 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3964 + nla_total_size(ICMP6_MIB_MAX * 8); /* IFLA_INET6_ICMP6STATS */
3967 static inline size_t inet6_if_nlmsg_size(void)
3969 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3970 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3971 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3972 + nla_total_size(4) /* IFLA_MTU */
3973 + nla_total_size(4) /* IFLA_LINK */
3974 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
3977 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
3978 int items, int bytes)
3981 int pad = bytes - sizeof(u64) * items;
3984 /* Use put_unaligned() because stats may not be aligned for u64. */
3985 put_unaligned(items, &stats[0]);
3986 for (i = 1; i < items; i++)
3987 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
3989 memset(&stats[items], 0, pad);
3992 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
3993 int items, int bytes, size_t syncpoff)
3996 int pad = bytes - sizeof(u64) * items;
3999 /* Use put_unaligned() because stats may not be aligned for u64. */
4000 put_unaligned(items, &stats[0]);
4001 for (i = 1; i < items; i++)
4002 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4004 memset(&stats[items], 0, pad);
4007 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4011 case IFLA_INET6_STATS:
4012 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
4013 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
4015 case IFLA_INET6_ICMP6STATS:
4016 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
4021 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4024 struct ifla_cacheinfo ci;
4026 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
4028 ci.max_reasm_len = IPV6_MAXPLEN;
4029 ci.tstamp = cstamp_delta(idev->tstamp);
4030 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4031 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
4032 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
4034 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4036 goto nla_put_failure;
4037 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4039 /* XXX - MC not implemented */
4041 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4043 goto nla_put_failure;
4044 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4046 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4048 goto nla_put_failure;
4049 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4057 static size_t inet6_get_link_af_size(const struct net_device *dev)
4059 if (!__in6_dev_get(dev))
4062 return inet6_ifla6_size();
4065 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4067 struct inet6_dev *idev = __in6_dev_get(dev);
4072 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4078 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4079 u32 pid, u32 seq, int event, unsigned int flags)
4081 struct net_device *dev = idev->dev;
4082 struct ifinfomsg *hdr;
4083 struct nlmsghdr *nlh;
4086 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
4090 hdr = nlmsg_data(nlh);
4091 hdr->ifi_family = AF_INET6;
4093 hdr->ifi_type = dev->type;
4094 hdr->ifi_index = dev->ifindex;
4095 hdr->ifi_flags = dev_get_flags(dev);
4096 hdr->ifi_change = 0;
4098 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
4101 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
4103 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
4104 if (dev->ifindex != dev->iflink)
4105 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
4107 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4108 if (protoinfo == NULL)
4109 goto nla_put_failure;
4111 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4112 goto nla_put_failure;
4114 nla_nest_end(skb, protoinfo);
4115 return nlmsg_end(skb, nlh);
4118 nlmsg_cancel(skb, nlh);
4122 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4124 struct net *net = sock_net(skb->sk);
4127 struct net_device *dev;
4128 struct inet6_dev *idev;
4129 struct hlist_head *head;
4130 struct hlist_node *node;
4133 s_idx = cb->args[1];
4136 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4138 head = &net->dev_index_head[h];
4139 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
4142 idev = __in6_dev_get(dev);
4145 if (inet6_fill_ifinfo(skb, idev,
4146 NETLINK_CB(cb->skb).pid,
4148 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4162 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4164 struct sk_buff *skb;
4165 struct net *net = dev_net(idev->dev);
4168 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4172 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4174 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4175 WARN_ON(err == -EMSGSIZE);
4179 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4183 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4186 static inline size_t inet6_prefix_nlmsg_size(void)
4188 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4189 + nla_total_size(sizeof(struct in6_addr))
4190 + nla_total_size(sizeof(struct prefix_cacheinfo));
4193 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4194 struct prefix_info *pinfo, u32 pid, u32 seq,
4195 int event, unsigned int flags)
4197 struct prefixmsg *pmsg;
4198 struct nlmsghdr *nlh;
4199 struct prefix_cacheinfo ci;
4201 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
4205 pmsg = nlmsg_data(nlh);
4206 pmsg->prefix_family = AF_INET6;
4207 pmsg->prefix_pad1 = 0;
4208 pmsg->prefix_pad2 = 0;
4209 pmsg->prefix_ifindex = idev->dev->ifindex;
4210 pmsg->prefix_len = pinfo->prefix_len;
4211 pmsg->prefix_type = pinfo->type;
4212 pmsg->prefix_pad3 = 0;
4213 pmsg->prefix_flags = 0;
4215 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4216 if (pinfo->autoconf)
4217 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4219 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
4221 ci.preferred_time = ntohl(pinfo->prefered);
4222 ci.valid_time = ntohl(pinfo->valid);
4223 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
4225 return nlmsg_end(skb, nlh);
4228 nlmsg_cancel(skb, nlh);
4232 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4233 struct prefix_info *pinfo)
4235 struct sk_buff *skb;
4236 struct net *net = dev_net(idev->dev);
4239 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4243 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4245 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4246 WARN_ON(err == -EMSGSIZE);
4250 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4254 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4257 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4259 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4264 * If the address was optimistic
4265 * we inserted the route at the start of
4266 * our DAD process, so we don't need
4269 if (!(ifp->rt->rt6i_node))
4270 ip6_ins_rt(ifp->rt);
4271 if (ifp->idev->cnf.forwarding)
4272 addrconf_join_anycast(ifp);
4275 if (ifp->idev->cnf.forwarding)
4276 addrconf_leave_anycast(ifp);
4277 addrconf_leave_solict(ifp->idev, &ifp->addr);
4278 dst_hold(&ifp->rt->dst);
4280 if (ip6_del_rt(ifp->rt))
4281 dst_free(&ifp->rt->dst);
4286 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4289 if (likely(ifp->idev->dead == 0))
4290 __ipv6_ifa_notify(event, ifp);
4291 rcu_read_unlock_bh();
4294 #ifdef CONFIG_SYSCTL
4297 int addrconf_sysctl_forward(ctl_table *ctl, int write,
4298 void __user *buffer, size_t *lenp, loff_t *ppos)
4300 int *valp = ctl->data;
4305 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4308 ret = addrconf_fixup_forwarding(ctl, valp, val);
4314 static void dev_disable_change(struct inet6_dev *idev)
4316 if (!idev || !idev->dev)
4319 if (idev->cnf.disable_ipv6)
4320 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4322 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4325 static void addrconf_disable_change(struct net *net, __s32 newf)
4327 struct net_device *dev;
4328 struct inet6_dev *idev;
4331 for_each_netdev_rcu(net, dev) {
4332 idev = __in6_dev_get(dev);
4334 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4335 idev->cnf.disable_ipv6 = newf;
4337 dev_disable_change(idev);
4343 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int old)
4347 net = (struct net *)table->extra2;
4349 if (p == &net->ipv6.devconf_dflt->disable_ipv6)
4352 if (!rtnl_trylock()) {
4353 /* Restore the original values before restarting */
4355 return restart_syscall();
4358 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4359 __s32 newf = net->ipv6.devconf_all->disable_ipv6;
4360 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4361 addrconf_disable_change(net, newf);
4362 } else if ((!*p) ^ (!old))
4363 dev_disable_change((struct inet6_dev *)table->extra1);
4370 int addrconf_sysctl_disable(ctl_table *ctl, int write,
4371 void __user *buffer, size_t *lenp, loff_t *ppos)
4373 int *valp = ctl->data;
4378 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4381 ret = addrconf_disable_ipv6(ctl, valp, val);
4387 static struct addrconf_sysctl_table
4389 struct ctl_table_header *sysctl_header;
4390 ctl_table addrconf_vars[DEVCONF_MAX+1];
4392 } addrconf_sysctl __read_mostly = {
4393 .sysctl_header = NULL,
4396 .procname = "forwarding",
4397 .data = &ipv6_devconf.forwarding,
4398 .maxlen = sizeof(int),
4400 .proc_handler = addrconf_sysctl_forward,
4403 .procname = "hop_limit",
4404 .data = &ipv6_devconf.hop_limit,
4405 .maxlen = sizeof(int),
4407 .proc_handler = proc_dointvec,
4411 .data = &ipv6_devconf.mtu6,
4412 .maxlen = sizeof(int),
4414 .proc_handler = proc_dointvec,
4417 .procname = "accept_ra",
4418 .data = &ipv6_devconf.accept_ra,
4419 .maxlen = sizeof(int),
4421 .proc_handler = proc_dointvec,
4424 .procname = "accept_redirects",
4425 .data = &ipv6_devconf.accept_redirects,
4426 .maxlen = sizeof(int),
4428 .proc_handler = proc_dointvec,
4431 .procname = "autoconf",
4432 .data = &ipv6_devconf.autoconf,
4433 .maxlen = sizeof(int),
4435 .proc_handler = proc_dointvec,
4438 .procname = "dad_transmits",
4439 .data = &ipv6_devconf.dad_transmits,
4440 .maxlen = sizeof(int),
4442 .proc_handler = proc_dointvec,
4445 .procname = "router_solicitations",
4446 .data = &ipv6_devconf.rtr_solicits,
4447 .maxlen = sizeof(int),
4449 .proc_handler = proc_dointvec,
4452 .procname = "router_solicitation_interval",
4453 .data = &ipv6_devconf.rtr_solicit_interval,
4454 .maxlen = sizeof(int),
4456 .proc_handler = proc_dointvec_jiffies,
4459 .procname = "router_solicitation_delay",
4460 .data = &ipv6_devconf.rtr_solicit_delay,
4461 .maxlen = sizeof(int),
4463 .proc_handler = proc_dointvec_jiffies,
4466 .procname = "force_mld_version",
4467 .data = &ipv6_devconf.force_mld_version,
4468 .maxlen = sizeof(int),
4470 .proc_handler = proc_dointvec,
4472 #ifdef CONFIG_IPV6_PRIVACY
4474 .procname = "use_tempaddr",
4475 .data = &ipv6_devconf.use_tempaddr,
4476 .maxlen = sizeof(int),
4478 .proc_handler = proc_dointvec,
4481 .procname = "temp_valid_lft",
4482 .data = &ipv6_devconf.temp_valid_lft,
4483 .maxlen = sizeof(int),
4485 .proc_handler = proc_dointvec,
4488 .procname = "temp_prefered_lft",
4489 .data = &ipv6_devconf.temp_prefered_lft,
4490 .maxlen = sizeof(int),
4492 .proc_handler = proc_dointvec,
4495 .procname = "regen_max_retry",
4496 .data = &ipv6_devconf.regen_max_retry,
4497 .maxlen = sizeof(int),
4499 .proc_handler = proc_dointvec,
4502 .procname = "max_desync_factor",
4503 .data = &ipv6_devconf.max_desync_factor,
4504 .maxlen = sizeof(int),
4506 .proc_handler = proc_dointvec,
4510 .procname = "max_addresses",
4511 .data = &ipv6_devconf.max_addresses,
4512 .maxlen = sizeof(int),
4514 .proc_handler = proc_dointvec,
4517 .procname = "accept_ra_defrtr",
4518 .data = &ipv6_devconf.accept_ra_defrtr,
4519 .maxlen = sizeof(int),
4521 .proc_handler = proc_dointvec,
4524 .procname = "accept_ra_pinfo",
4525 .data = &ipv6_devconf.accept_ra_pinfo,
4526 .maxlen = sizeof(int),
4528 .proc_handler = proc_dointvec,
4530 #ifdef CONFIG_IPV6_ROUTER_PREF
4532 .procname = "accept_ra_rtr_pref",
4533 .data = &ipv6_devconf.accept_ra_rtr_pref,
4534 .maxlen = sizeof(int),
4536 .proc_handler = proc_dointvec,
4539 .procname = "router_probe_interval",
4540 .data = &ipv6_devconf.rtr_probe_interval,
4541 .maxlen = sizeof(int),
4543 .proc_handler = proc_dointvec_jiffies,
4545 #ifdef CONFIG_IPV6_ROUTE_INFO
4547 .procname = "accept_ra_rt_info_max_plen",
4548 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4549 .maxlen = sizeof(int),
4551 .proc_handler = proc_dointvec,
4556 .procname = "proxy_ndp",
4557 .data = &ipv6_devconf.proxy_ndp,
4558 .maxlen = sizeof(int),
4560 .proc_handler = proc_dointvec,
4563 .procname = "accept_source_route",
4564 .data = &ipv6_devconf.accept_source_route,
4565 .maxlen = sizeof(int),
4567 .proc_handler = proc_dointvec,
4569 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4571 .procname = "optimistic_dad",
4572 .data = &ipv6_devconf.optimistic_dad,
4573 .maxlen = sizeof(int),
4575 .proc_handler = proc_dointvec,
4579 #ifdef CONFIG_IPV6_MROUTE
4581 .procname = "mc_forwarding",
4582 .data = &ipv6_devconf.mc_forwarding,
4583 .maxlen = sizeof(int),
4585 .proc_handler = proc_dointvec,
4589 .procname = "disable_ipv6",
4590 .data = &ipv6_devconf.disable_ipv6,
4591 .maxlen = sizeof(int),
4593 .proc_handler = addrconf_sysctl_disable,
4596 .procname = "accept_dad",
4597 .data = &ipv6_devconf.accept_dad,
4598 .maxlen = sizeof(int),
4600 .proc_handler = proc_dointvec,
4603 .procname = "force_tllao",
4604 .data = &ipv6_devconf.force_tllao,
4605 .maxlen = sizeof(int),
4607 .proc_handler = proc_dointvec
4615 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4616 struct inet6_dev *idev, struct ipv6_devconf *p)
4619 struct addrconf_sysctl_table *t;
4621 #define ADDRCONF_CTL_PATH_DEV 3
4623 struct ctl_path addrconf_ctl_path[] = {
4624 { .procname = "net", },
4625 { .procname = "ipv6", },
4626 { .procname = "conf", },
4627 { /* to be set */ },
4632 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4636 for (i = 0; t->addrconf_vars[i].data; i++) {
4637 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
4638 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4639 t->addrconf_vars[i].extra2 = net;
4643 * Make a copy of dev_name, because '.procname' is regarded as const
4644 * by sysctl and we wouldn't want anyone to change it under our feet
4645 * (see SIOCSIFNAME).
4647 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4651 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4653 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4655 if (t->sysctl_header == NULL)
4669 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4671 struct addrconf_sysctl_table *t;
4673 if (p->sysctl == NULL)
4678 unregister_net_sysctl_table(t->sysctl_header);
4683 static void addrconf_sysctl_register(struct inet6_dev *idev)
4685 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
4686 &ndisc_ifinfo_sysctl_change);
4687 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4691 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4693 __addrconf_sysctl_unregister(&idev->cnf);
4694 neigh_sysctl_unregister(idev->nd_parms);
4700 static int __net_init addrconf_init_net(struct net *net)
4703 struct ipv6_devconf *all, *dflt;
4705 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
4709 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4711 goto err_alloc_dflt;
4713 /* these will be inherited by all namespaces */
4714 dflt->autoconf = ipv6_defaults.autoconf;
4715 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
4717 net->ipv6.devconf_all = all;
4718 net->ipv6.devconf_dflt = dflt;
4720 #ifdef CONFIG_SYSCTL
4721 err = __addrconf_sysctl_register(net, "all", NULL, all);
4725 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
4731 #ifdef CONFIG_SYSCTL
4733 __addrconf_sysctl_unregister(all);
4743 static void __net_exit addrconf_exit_net(struct net *net)
4745 #ifdef CONFIG_SYSCTL
4746 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4747 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4749 if (!net_eq(net, &init_net)) {
4750 kfree(net->ipv6.devconf_dflt);
4751 kfree(net->ipv6.devconf_all);
4755 static struct pernet_operations addrconf_ops = {
4756 .init = addrconf_init_net,
4757 .exit = addrconf_exit_net,
4764 int register_inet6addr_notifier(struct notifier_block *nb)
4766 return atomic_notifier_chain_register(&inet6addr_chain, nb);
4768 EXPORT_SYMBOL(register_inet6addr_notifier);
4770 int unregister_inet6addr_notifier(struct notifier_block *nb)
4772 return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
4774 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4776 static struct rtnl_af_ops inet6_ops = {
4778 .fill_link_af = inet6_fill_link_af,
4779 .get_link_af_size = inet6_get_link_af_size,
4783 * Init / cleanup code
4786 int __init addrconf_init(void)
4790 err = ipv6_addr_label_init();
4792 printk(KERN_CRIT "IPv6 Addrconf:"
4793 " cannot initialize default policy table: %d.\n", err);
4797 err = register_pernet_subsys(&addrconf_ops);
4801 /* The addrconf netdev notifier requires that loopback_dev
4802 * has it's ipv6 private information allocated and setup
4803 * before it can bring up and give link-local addresses
4804 * to other devices which are up.
4806 * Unfortunately, loopback_dev is not necessarily the first
4807 * entry in the global dev_base list of net devices. In fact,
4808 * it is likely to be the very last entry on that list.
4809 * So this causes the notifier registry below to try and
4810 * give link-local addresses to all devices besides loopback_dev
4811 * first, then loopback_dev, which cases all the non-loopback_dev
4812 * devices to fail to get a link-local address.
4814 * So, as a temporary fix, allocate the ipv6 structure for
4815 * loopback_dev first by hand.
4816 * Longer term, all of the dependencies ipv6 has upon the loopback
4817 * device and it being up should be removed.
4820 if (!ipv6_add_dev(init_net.loopback_dev))
4826 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4827 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
4829 register_netdevice_notifier(&ipv6_dev_notf);
4833 err = rtnl_af_register(&inet6_ops);
4837 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
4842 /* Only the first call to __rtnl_register can fail */
4843 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
4844 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
4845 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
4846 inet6_dump_ifaddr, NULL);
4847 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
4848 inet6_dump_ifmcaddr, NULL);
4849 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
4850 inet6_dump_ifacaddr, NULL);
4852 ipv6_addr_label_rtnl_register();
4856 rtnl_af_unregister(&inet6_ops);
4858 unregister_netdevice_notifier(&ipv6_dev_notf);
4860 unregister_pernet_subsys(&addrconf_ops);
4862 ipv6_addr_label_cleanup();
4867 void addrconf_cleanup(void)
4869 struct net_device *dev;
4872 unregister_netdevice_notifier(&ipv6_dev_notf);
4873 unregister_pernet_subsys(&addrconf_ops);
4874 ipv6_addr_label_cleanup();
4878 __rtnl_af_unregister(&inet6_ops);
4880 /* clean dev list */
4881 for_each_netdev(&init_net, dev) {
4882 if (__in6_dev_get(dev) == NULL)
4884 addrconf_ifdown(dev, 1);
4886 addrconf_ifdown(init_net.loopback_dev, 2);
4891 spin_lock_bh(&addrconf_hash_lock);
4892 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4893 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
4894 spin_unlock_bh(&addrconf_hash_lock);
4896 del_timer(&addr_chk_timer);