2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
6 * Pedro Roque <roque@di.fc.ul.pt>
7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
25 * yoshfuji@USAGI : Fixed interval between DAD
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
41 #include <linux/errno.h>
42 #include <linux/types.h>
43 #include <linux/kernel.h>
44 #include <linux/socket.h>
45 #include <linux/sockios.h>
46 #include <linux/net.h>
47 #include <linux/in6.h>
48 #include <linux/netdevice.h>
49 #include <linux/if_addr.h>
50 #include <linux/if_arp.h>
51 #include <linux/if_arcnet.h>
52 #include <linux/if_infiniband.h>
53 #include <linux/route.h>
54 #include <linux/inetdevice.h>
55 #include <linux/init.h>
56 #include <linux/slab.h>
58 #include <linux/sysctl.h>
60 #include <linux/capability.h>
61 #include <linux/delay.h>
62 #include <linux/notifier.h>
63 #include <linux/string.h>
65 #include <net/net_namespace.h>
70 #include <net/protocol.h>
71 #include <net/ndisc.h>
72 #include <net/ip6_route.h>
73 #include <net/addrconf.h>
76 #include <net/netlink.h>
77 #include <net/pkt_sched.h>
78 #include <linux/if_tunnel.h>
79 #include <linux/rtnetlink.h>
81 #ifdef CONFIG_IPV6_PRIVACY
82 #include <linux/random.h>
85 #include <linux/uaccess.h>
86 #include <asm/unaligned.h>
88 #include <linux/proc_fs.h>
89 #include <linux/seq_file.h>
91 /* Set to 3 to get tracing... */
95 #define ADBG(x) printk x
100 #define INFINITY_LIFE_TIME 0xFFFFFFFF
102 static inline u32 cstamp_delta(unsigned long cstamp)
104 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
107 #define ADDRCONF_TIMER_FUZZ_MINUS (HZ > 50 ? HZ/50 : 1)
108 #define ADDRCONF_TIMER_FUZZ (HZ / 4)
109 #define ADDRCONF_TIMER_FUZZ_MAX (HZ)
112 static void addrconf_sysctl_register(struct inet6_dev *idev);
113 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
115 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
119 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
124 #ifdef CONFIG_IPV6_PRIVACY
125 static int __ipv6_regen_rndid(struct inet6_dev *idev);
126 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
127 static void ipv6_regen_rndid(unsigned long data);
130 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
131 static int ipv6_count_addresses(struct inet6_dev *idev);
134 * Configured unicast address hash table
136 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
137 static DEFINE_SPINLOCK(addrconf_hash_lock);
139 static void addrconf_verify(unsigned long);
141 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
142 static DEFINE_SPINLOCK(addrconf_verify_lock);
144 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
145 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
147 static void addrconf_type_change(struct net_device *dev,
148 unsigned long event);
149 static int addrconf_ifdown(struct net_device *dev, int how);
151 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
152 static void addrconf_dad_timer(unsigned long data);
153 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
154 static void addrconf_dad_run(struct inet6_dev *idev);
155 static void addrconf_rs_timer(unsigned long data);
156 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
157 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
159 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
160 struct prefix_info *pinfo);
161 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
162 struct net_device *dev);
164 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
166 static struct ipv6_devconf ipv6_devconf __read_mostly = {
168 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
169 .mtu6 = IPV6_MIN_MTU,
171 .accept_redirects = 1,
173 .force_mld_version = 0,
175 .rtr_solicits = MAX_RTR_SOLICITATIONS,
176 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
177 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
178 #ifdef CONFIG_IPV6_PRIVACY
180 .temp_valid_lft = TEMP_VALID_LIFETIME,
181 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
182 .regen_max_retry = REGEN_MAX_RETRY,
183 .max_desync_factor = MAX_DESYNC_FACTOR,
185 .max_addresses = IPV6_MAX_ADDRESSES,
186 .accept_ra_defrtr = 1,
187 .accept_ra_pinfo = 1,
188 #ifdef CONFIG_IPV6_ROUTER_PREF
189 .accept_ra_rtr_pref = 1,
190 .rtr_probe_interval = 60 * HZ,
191 #ifdef CONFIG_IPV6_ROUTE_INFO
192 .accept_ra_rt_info_max_plen = 0,
196 .accept_source_route = 0, /* we do not accept RH0 by default. */
201 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
203 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
204 .mtu6 = IPV6_MIN_MTU,
206 .accept_redirects = 1,
209 .rtr_solicits = MAX_RTR_SOLICITATIONS,
210 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
211 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
212 #ifdef CONFIG_IPV6_PRIVACY
214 .temp_valid_lft = TEMP_VALID_LIFETIME,
215 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
216 .regen_max_retry = REGEN_MAX_RETRY,
217 .max_desync_factor = MAX_DESYNC_FACTOR,
219 .max_addresses = IPV6_MAX_ADDRESSES,
220 .accept_ra_defrtr = 1,
221 .accept_ra_pinfo = 1,
222 #ifdef CONFIG_IPV6_ROUTER_PREF
223 .accept_ra_rtr_pref = 1,
224 .rtr_probe_interval = 60 * HZ,
225 #ifdef CONFIG_IPV6_ROUTE_INFO
226 .accept_ra_rt_info_max_plen = 0,
230 .accept_source_route = 0, /* we do not accept RH0 by default. */
235 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
236 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
237 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
238 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
239 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
241 /* Check if a valid qdisc is available */
242 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
244 return !qdisc_tx_is_noop(dev);
247 /* Check if a route is valid prefix route */
248 static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
250 return (rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0;
253 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
255 if (del_timer(&ifp->timer))
259 enum addrconf_timer_t {
265 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
266 enum addrconf_timer_t what,
269 if (!del_timer(&ifp->timer))
274 ifp->timer.function = addrconf_dad_timer;
277 ifp->timer.function = addrconf_rs_timer;
282 ifp->timer.expires = jiffies + when;
283 add_timer(&ifp->timer);
286 static int snmp6_alloc_dev(struct inet6_dev *idev)
288 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
289 sizeof(struct ipstats_mib),
290 __alignof__(struct ipstats_mib)) < 0)
292 if (snmp_mib_init((void __percpu **)idev->stats.icmpv6,
293 sizeof(struct icmpv6_mib),
294 __alignof__(struct icmpv6_mib)) < 0)
296 if (snmp_mib_init((void __percpu **)idev->stats.icmpv6msg,
297 sizeof(struct icmpv6msg_mib),
298 __alignof__(struct icmpv6msg_mib)) < 0)
304 snmp_mib_free((void __percpu **)idev->stats.icmpv6);
306 snmp_mib_free((void __percpu **)idev->stats.ipv6);
311 static void snmp6_free_dev(struct inet6_dev *idev)
313 snmp_mib_free((void __percpu **)idev->stats.icmpv6msg);
314 snmp_mib_free((void __percpu **)idev->stats.icmpv6);
315 snmp_mib_free((void __percpu **)idev->stats.ipv6);
318 /* Nobody refers to this device, we may destroy it. */
320 static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
322 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
326 void in6_dev_finish_destroy(struct inet6_dev *idev)
328 struct net_device *dev = idev->dev;
330 WARN_ON(!list_empty(&idev->addr_list));
331 WARN_ON(idev->mc_list != NULL);
333 #ifdef NET_REFCNT_DEBUG
334 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
338 pr_warning("Freeing alive inet6 device %p\n", idev);
341 snmp6_free_dev(idev);
342 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
345 EXPORT_SYMBOL(in6_dev_finish_destroy);
347 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
349 struct inet6_dev *ndev;
353 if (dev->mtu < IPV6_MIN_MTU)
356 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
361 rwlock_init(&ndev->lock);
363 INIT_LIST_HEAD(&ndev->addr_list);
365 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
366 ndev->cnf.mtu6 = dev->mtu;
367 ndev->cnf.sysctl = NULL;
368 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
369 if (ndev->nd_parms == NULL) {
373 if (ndev->cnf.forwarding)
374 dev_disable_lro(dev);
375 /* We refer to the device */
378 if (snmp6_alloc_dev(ndev) < 0) {
380 "%s(): cannot allocate memory for statistics; dev=%s.\n",
381 __func__, dev->name));
382 neigh_parms_release(&nd_tbl, ndev->nd_parms);
384 in6_dev_finish_destroy(ndev);
388 if (snmp6_register_dev(ndev) < 0) {
390 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
391 __func__, dev->name));
392 neigh_parms_release(&nd_tbl, ndev->nd_parms);
394 in6_dev_finish_destroy(ndev);
398 /* One reference from device. We must do this before
399 * we invoke __ipv6_regen_rndid().
403 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
404 ndev->cnf.accept_dad = -1;
406 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
407 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
409 "%s: Disabled Multicast RS\n",
411 ndev->cnf.rtr_solicits = 0;
415 #ifdef CONFIG_IPV6_PRIVACY
416 INIT_LIST_HEAD(&ndev->tempaddr_list);
417 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
418 if ((dev->flags&IFF_LOOPBACK) ||
419 dev->type == ARPHRD_TUNNEL ||
420 dev->type == ARPHRD_TUNNEL6 ||
421 dev->type == ARPHRD_SIT ||
422 dev->type == ARPHRD_NONE) {
423 ndev->cnf.use_tempaddr = -1;
426 ipv6_regen_rndid((unsigned long) ndev);
430 if (netif_running(dev) && addrconf_qdisc_ok(dev))
431 ndev->if_flags |= IF_READY;
433 ipv6_mc_init_dev(ndev);
434 ndev->tstamp = jiffies;
435 addrconf_sysctl_register(ndev);
436 /* protected by rtnl_lock */
437 rcu_assign_pointer(dev->ip6_ptr, ndev);
439 /* Join all-node multicast group */
440 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
445 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
447 struct inet6_dev *idev;
451 idev = __in6_dev_get(dev);
453 idev = ipv6_add_dev(dev);
458 if (dev->flags&IFF_UP)
464 static void dev_forward_change(struct inet6_dev *idev)
466 struct net_device *dev;
467 struct inet6_ifaddr *ifa;
472 if (idev->cnf.forwarding)
473 dev_disable_lro(dev);
474 if (dev && (dev->flags & IFF_MULTICAST)) {
475 if (idev->cnf.forwarding)
476 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
478 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
481 list_for_each_entry(ifa, &idev->addr_list, if_list) {
482 if (ifa->flags&IFA_F_TENTATIVE)
484 if (idev->cnf.forwarding)
485 addrconf_join_anycast(ifa);
487 addrconf_leave_anycast(ifa);
492 static void addrconf_forward_change(struct net *net, __s32 newf)
494 struct net_device *dev;
495 struct inet6_dev *idev;
498 for_each_netdev_rcu(net, dev) {
499 idev = __in6_dev_get(dev);
501 int changed = (!idev->cnf.forwarding) ^ (!newf);
502 idev->cnf.forwarding = newf;
504 dev_forward_change(idev);
510 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
514 net = (struct net *)table->extra2;
515 if (p == &net->ipv6.devconf_dflt->forwarding)
518 if (!rtnl_trylock()) {
519 /* Restore the original values before restarting */
521 return restart_syscall();
524 if (p == &net->ipv6.devconf_all->forwarding) {
525 __s32 newf = net->ipv6.devconf_all->forwarding;
526 net->ipv6.devconf_dflt->forwarding = newf;
527 addrconf_forward_change(net, newf);
528 } else if ((!*p) ^ (!old))
529 dev_forward_change((struct inet6_dev *)table->extra1);
533 rt6_purge_dflt_routers(net);
538 static void inet6_ifa_finish_destroy_rcu(struct rcu_head *head)
540 struct inet6_ifaddr *ifp = container_of(head, struct inet6_ifaddr, rcu);
544 /* Nobody refers to this ifaddr, destroy it */
545 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
547 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
549 #ifdef NET_REFCNT_DEBUG
550 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
553 in6_dev_put(ifp->idev);
555 if (del_timer(&ifp->timer))
556 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
558 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
559 pr_warning("Freeing alive inet6 address %p\n", ifp);
562 dst_release(&ifp->rt->dst);
564 call_rcu(&ifp->rcu, inet6_ifa_finish_destroy_rcu);
568 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
571 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
574 * Each device address list is sorted in order of scope -
575 * global before linklocal.
577 list_for_each(p, &idev->addr_list) {
578 struct inet6_ifaddr *ifa
579 = list_entry(p, struct inet6_ifaddr, if_list);
580 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
584 list_add_tail(&ifp->if_list, p);
587 static u32 ipv6_addr_hash(const struct in6_addr *addr)
590 * We perform the hash function over the last 64 bits of the address
591 * This will include the IEEE address token on links that support it.
593 return jhash_2words((__force u32)addr->s6_addr32[2],
594 (__force u32)addr->s6_addr32[3], 0)
595 & (IN6_ADDR_HSIZE - 1);
598 /* On success it returns ifp with increased reference count */
600 static struct inet6_ifaddr *
601 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
602 int scope, u32 flags)
604 struct inet6_ifaddr *ifa = NULL;
608 int addr_type = ipv6_addr_type(addr);
610 if (addr_type == IPV6_ADDR_ANY ||
611 addr_type & IPV6_ADDR_MULTICAST ||
612 (!(idev->dev->flags & IFF_LOOPBACK) &&
613 addr_type & IPV6_ADDR_LOOPBACK))
614 return ERR_PTR(-EADDRNOTAVAIL);
618 err = -ENODEV; /*XXX*/
622 if (idev->cnf.disable_ipv6) {
627 spin_lock(&addrconf_hash_lock);
629 /* Ignore adding duplicate addresses on an interface */
630 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
631 ADBG(("ipv6_add_addr: already assigned\n"));
636 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
639 ADBG(("ipv6_add_addr: malloc failed\n"));
644 rt = addrconf_dst_alloc(idev, addr, 0);
650 ipv6_addr_copy(&ifa->addr, addr);
652 spin_lock_init(&ifa->lock);
653 spin_lock_init(&ifa->state_lock);
654 init_timer(&ifa->timer);
655 INIT_HLIST_NODE(&ifa->addr_lst);
656 ifa->timer.data = (unsigned long) ifa;
658 ifa->prefix_len = pfxlen;
659 ifa->flags = flags | IFA_F_TENTATIVE;
660 ifa->cstamp = ifa->tstamp = jiffies;
665 * part one of RFC 4429, section 3.3
666 * We should not configure an address as
667 * optimistic if we do not yet know the link
668 * layer address of our nexhop router
671 if (rt->rt6i_nexthop == NULL)
672 ifa->flags &= ~IFA_F_OPTIMISTIC;
679 /* Add to big hash table */
680 hash = ipv6_addr_hash(addr);
682 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
683 spin_unlock(&addrconf_hash_lock);
685 write_lock(&idev->lock);
686 /* Add to inet6_dev unicast addr list. */
687 ipv6_link_dev_addr(idev, ifa);
689 #ifdef CONFIG_IPV6_PRIVACY
690 if (ifa->flags&IFA_F_TEMPORARY) {
691 list_add(&ifa->tmp_list, &idev->tempaddr_list);
697 write_unlock(&idev->lock);
699 rcu_read_unlock_bh();
701 if (likely(err == 0))
702 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
710 spin_unlock(&addrconf_hash_lock);
714 /* This function wants to get referenced ifp and releases it before return */
716 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
718 struct inet6_ifaddr *ifa, *ifn;
719 struct inet6_dev *idev = ifp->idev;
722 int deleted = 0, onlink = 0;
723 unsigned long expires = jiffies;
725 hash = ipv6_addr_hash(&ifp->addr);
727 spin_lock_bh(&ifp->state_lock);
729 ifp->state = INET6_IFADDR_STATE_DEAD;
730 spin_unlock_bh(&ifp->state_lock);
732 if (state == INET6_IFADDR_STATE_DEAD)
735 spin_lock_bh(&addrconf_hash_lock);
736 hlist_del_init_rcu(&ifp->addr_lst);
737 spin_unlock_bh(&addrconf_hash_lock);
739 write_lock_bh(&idev->lock);
740 #ifdef CONFIG_IPV6_PRIVACY
741 if (ifp->flags&IFA_F_TEMPORARY) {
742 list_del(&ifp->tmp_list);
744 in6_ifa_put(ifp->ifpub);
751 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
753 list_del_init(&ifp->if_list);
756 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
760 } else if (ifp->flags & IFA_F_PERMANENT) {
761 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
763 if (ifa->flags & IFA_F_PERMANENT) {
768 unsigned long lifetime;
773 spin_lock(&ifa->lock);
775 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
777 * Note: Because this address is
778 * not permanent, lifetime <
779 * LONG_MAX / HZ here.
781 if (time_before(expires,
782 ifa->tstamp + lifetime * HZ))
783 expires = ifa->tstamp + lifetime * HZ;
784 spin_unlock(&ifa->lock);
789 write_unlock_bh(&idev->lock);
791 addrconf_del_timer(ifp);
793 ipv6_ifa_notify(RTM_DELADDR, ifp);
795 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
798 * Purge or update corresponding prefix
800 * 1) we don't purge prefix here if address was not permanent.
801 * prefix is managed by its own lifetime.
802 * 2) if there're no addresses, delete prefix.
803 * 3) if there're still other permanent address(es),
804 * corresponding prefix is still permanent.
805 * 4) otherwise, update prefix lifetime to the
806 * longest valid lifetime among the corresponding
807 * addresses on the device.
808 * Note: subsequent RA will update lifetime.
812 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
813 struct in6_addr prefix;
815 struct net *net = dev_net(ifp->idev->dev);
816 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
817 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
819 if (rt && addrconf_is_prefix_route(rt)) {
823 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
824 rt->rt6i_expires = expires;
825 rt->rt6i_flags |= RTF_EXPIRES;
828 dst_release(&rt->dst);
835 #ifdef CONFIG_IPV6_PRIVACY
836 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
838 struct inet6_dev *idev = ifp->idev;
839 struct in6_addr addr, *tmpaddr;
840 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp, age;
841 unsigned long regen_advance;
847 write_lock(&idev->lock);
849 spin_lock_bh(&ift->lock);
850 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
851 spin_unlock_bh(&ift->lock);
858 if (idev->cnf.use_tempaddr <= 0) {
859 write_unlock(&idev->lock);
861 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
866 spin_lock_bh(&ifp->lock);
867 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
868 idev->cnf.use_tempaddr = -1; /*XXX*/
869 spin_unlock_bh(&ifp->lock);
870 write_unlock(&idev->lock);
872 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
878 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
879 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
880 spin_unlock_bh(&ifp->lock);
881 write_unlock(&idev->lock);
883 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
889 memcpy(&addr.s6_addr[8], idev->rndid, 8);
890 age = (jiffies - ifp->tstamp) / HZ;
891 tmp_valid_lft = min_t(__u32,
893 idev->cnf.temp_valid_lft + age);
894 tmp_prefered_lft = min_t(__u32,
896 idev->cnf.temp_prefered_lft + age -
897 idev->cnf.max_desync_factor);
898 tmp_plen = ifp->prefix_len;
899 max_addresses = idev->cnf.max_addresses;
900 tmp_cstamp = ifp->cstamp;
901 tmp_tstamp = ifp->tstamp;
902 spin_unlock_bh(&ifp->lock);
904 regen_advance = idev->cnf.regen_max_retry *
905 idev->cnf.dad_transmits *
906 idev->nd_parms->retrans_time / HZ;
907 write_unlock(&idev->lock);
909 /* A temporary address is created only if this calculated Preferred
910 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
911 * an implementation must not create a temporary address with a zero
912 * Preferred Lifetime.
914 if (tmp_prefered_lft <= regen_advance) {
921 addr_flags = IFA_F_TEMPORARY;
922 /* set in addrconf_prefix_rcv() */
923 if (ifp->flags & IFA_F_OPTIMISTIC)
924 addr_flags |= IFA_F_OPTIMISTIC;
926 ift = !max_addresses ||
927 ipv6_count_addresses(idev) < max_addresses ?
928 ipv6_add_addr(idev, &addr, tmp_plen,
929 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
931 if (!ift || IS_ERR(ift)) {
935 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
937 write_lock(&idev->lock);
941 spin_lock_bh(&ift->lock);
943 ift->valid_lft = tmp_valid_lft;
944 ift->prefered_lft = tmp_prefered_lft;
945 ift->cstamp = tmp_cstamp;
946 ift->tstamp = tmp_tstamp;
947 spin_unlock_bh(&ift->lock);
949 addrconf_dad_start(ift, 0);
958 * Choose an appropriate source address (RFC3484)
961 IPV6_SADDR_RULE_INIT = 0,
962 IPV6_SADDR_RULE_LOCAL,
963 IPV6_SADDR_RULE_SCOPE,
964 IPV6_SADDR_RULE_PREFERRED,
965 #ifdef CONFIG_IPV6_MIP6
969 IPV6_SADDR_RULE_LABEL,
970 #ifdef CONFIG_IPV6_PRIVACY
971 IPV6_SADDR_RULE_PRIVACY,
973 IPV6_SADDR_RULE_ORCHID,
974 IPV6_SADDR_RULE_PREFIX,
978 struct ipv6_saddr_score {
981 struct inet6_ifaddr *ifa;
982 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
987 struct ipv6_saddr_dst {
988 const struct in6_addr *addr;
995 static inline int ipv6_saddr_preferred(int type)
997 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1002 static int ipv6_get_saddr_eval(struct net *net,
1003 struct ipv6_saddr_score *score,
1004 struct ipv6_saddr_dst *dst,
1009 if (i <= score->rule) {
1011 case IPV6_SADDR_RULE_SCOPE:
1012 ret = score->scopedist;
1014 case IPV6_SADDR_RULE_PREFIX:
1015 ret = score->matchlen;
1018 ret = !!test_bit(i, score->scorebits);
1024 case IPV6_SADDR_RULE_INIT:
1025 /* Rule 0: remember if hiscore is not ready yet */
1028 case IPV6_SADDR_RULE_LOCAL:
1029 /* Rule 1: Prefer same address */
1030 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1032 case IPV6_SADDR_RULE_SCOPE:
1033 /* Rule 2: Prefer appropriate scope
1038 * ---+--+-+---> scope
1040 * | d is scope of the destination.
1042 * | \ <- smaller scope is better if
1043 * B-15 | \ if scope is enough for destinaion.
1044 * | ret = B - scope (-1 <= scope >= d <= 15).
1046 * |/ <- greater is better
1047 * -C / if scope is not enough for destination.
1048 * /| ret = scope - C (-1 <= d < scope <= 15).
1050 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1051 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1052 * Assume B = 0 and we get C > 29.
1054 ret = __ipv6_addr_src_scope(score->addr_type);
1055 if (ret >= dst->scope)
1058 ret -= 128; /* 30 is enough */
1059 score->scopedist = ret;
1061 case IPV6_SADDR_RULE_PREFERRED:
1062 /* Rule 3: Avoid deprecated and optimistic addresses */
1063 ret = ipv6_saddr_preferred(score->addr_type) ||
1064 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1066 #ifdef CONFIG_IPV6_MIP6
1067 case IPV6_SADDR_RULE_HOA:
1069 /* Rule 4: Prefer home address */
1070 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1071 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1075 case IPV6_SADDR_RULE_OIF:
1076 /* Rule 5: Prefer outgoing interface */
1077 ret = (!dst->ifindex ||
1078 dst->ifindex == score->ifa->idev->dev->ifindex);
1080 case IPV6_SADDR_RULE_LABEL:
1081 /* Rule 6: Prefer matching label */
1082 ret = ipv6_addr_label(net,
1083 &score->ifa->addr, score->addr_type,
1084 score->ifa->idev->dev->ifindex) == dst->label;
1086 #ifdef CONFIG_IPV6_PRIVACY
1087 case IPV6_SADDR_RULE_PRIVACY:
1089 /* Rule 7: Prefer public address
1090 * Note: prefer temprary address if use_tempaddr >= 2
1092 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1093 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1094 score->ifa->idev->cnf.use_tempaddr >= 2;
1095 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1099 case IPV6_SADDR_RULE_ORCHID:
1100 /* Rule 8-: Prefer ORCHID vs ORCHID or
1101 * non-ORCHID vs non-ORCHID
1103 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1104 ipv6_addr_orchid(dst->addr));
1106 case IPV6_SADDR_RULE_PREFIX:
1107 /* Rule 8: Use longest matching prefix */
1108 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1116 __set_bit(i, score->scorebits);
1122 int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
1123 const struct in6_addr *daddr, unsigned int prefs,
1124 struct in6_addr *saddr)
1126 struct ipv6_saddr_score scores[2],
1127 *score = &scores[0], *hiscore = &scores[1];
1128 struct ipv6_saddr_dst dst;
1129 struct net_device *dev;
1132 dst_type = __ipv6_addr_type(daddr);
1134 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1135 dst.scope = __ipv6_addr_src_scope(dst_type);
1136 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1140 hiscore->ifa = NULL;
1144 for_each_netdev_rcu(net, dev) {
1145 struct inet6_dev *idev;
1147 /* Candidate Source Address (section 4)
1148 * - multicast and link-local destination address,
1149 * the set of candidate source address MUST only
1150 * include addresses assigned to interfaces
1151 * belonging to the same link as the outgoing
1153 * (- For site-local destination addresses, the
1154 * set of candidate source addresses MUST only
1155 * include addresses assigned to interfaces
1156 * belonging to the same site as the outgoing
1159 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1160 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1161 dst.ifindex && dev->ifindex != dst.ifindex)
1164 idev = __in6_dev_get(dev);
1168 read_lock_bh(&idev->lock);
1169 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1173 * - Tentative Address (RFC2462 section 5.4)
1174 * - A tentative address is not considered
1175 * "assigned to an interface" in the traditional
1176 * sense, unless it is also flagged as optimistic.
1177 * - Candidate Source Address (section 4)
1178 * - In any case, anycast addresses, multicast
1179 * addresses, and the unspecified address MUST
1180 * NOT be included in a candidate set.
1182 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1183 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1186 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1188 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1189 score->addr_type & IPV6_ADDR_MULTICAST)) {
1190 LIMIT_NETDEBUG(KERN_DEBUG
1191 "ADDRCONF: unspecified / multicast address "
1192 "assigned as unicast address on %s",
1198 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1200 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1201 int minihiscore, miniscore;
1203 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1204 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1206 if (minihiscore > miniscore) {
1207 if (i == IPV6_SADDR_RULE_SCOPE &&
1208 score->scopedist > 0) {
1211 * each remaining entry
1212 * has too small (not enough)
1213 * scope, because ifa entries
1214 * are sorted by their scope
1220 } else if (minihiscore < miniscore) {
1222 in6_ifa_put(hiscore->ifa);
1224 in6_ifa_hold(score->ifa);
1226 swap(hiscore, score);
1228 /* restore our iterator */
1229 score->ifa = hiscore->ifa;
1236 read_unlock_bh(&idev->lock);
1241 return -EADDRNOTAVAIL;
1243 ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1244 in6_ifa_put(hiscore->ifa);
1247 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1249 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1250 unsigned char banned_flags)
1252 struct inet6_dev *idev;
1253 int err = -EADDRNOTAVAIL;
1256 idev = __in6_dev_get(dev);
1258 struct inet6_ifaddr *ifp;
1260 read_lock_bh(&idev->lock);
1261 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1262 if (ifp->scope == IFA_LINK &&
1263 !(ifp->flags & banned_flags)) {
1264 ipv6_addr_copy(addr, &ifp->addr);
1269 read_unlock_bh(&idev->lock);
1275 static int ipv6_count_addresses(struct inet6_dev *idev)
1278 struct inet6_ifaddr *ifp;
1280 read_lock_bh(&idev->lock);
1281 list_for_each_entry(ifp, &idev->addr_list, if_list)
1283 read_unlock_bh(&idev->lock);
1287 int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1288 struct net_device *dev, int strict)
1290 struct inet6_ifaddr *ifp;
1291 struct hlist_node *node;
1292 unsigned int hash = ipv6_addr_hash(addr);
1295 hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1296 if (!net_eq(dev_net(ifp->idev->dev), net))
1298 if (ipv6_addr_equal(&ifp->addr, addr) &&
1299 !(ifp->flags&IFA_F_TENTATIVE) &&
1300 (dev == NULL || ifp->idev->dev == dev ||
1301 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1302 rcu_read_unlock_bh();
1307 rcu_read_unlock_bh();
1310 EXPORT_SYMBOL(ipv6_chk_addr);
1312 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1313 struct net_device *dev)
1315 unsigned int hash = ipv6_addr_hash(addr);
1316 struct inet6_ifaddr *ifp;
1317 struct hlist_node *node;
1319 hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1320 if (!net_eq(dev_net(ifp->idev->dev), net))
1322 if (ipv6_addr_equal(&ifp->addr, addr)) {
1323 if (dev == NULL || ifp->idev->dev == dev)
1330 int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev)
1332 struct inet6_dev *idev;
1333 struct inet6_ifaddr *ifa;
1338 idev = __in6_dev_get(dev);
1340 read_lock_bh(&idev->lock);
1341 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1342 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1347 read_unlock_bh(&idev->lock);
1353 EXPORT_SYMBOL(ipv6_chk_prefix);
1355 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1356 struct net_device *dev, int strict)
1358 struct inet6_ifaddr *ifp, *result = NULL;
1359 unsigned int hash = ipv6_addr_hash(addr);
1360 struct hlist_node *node;
1363 hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1364 if (!net_eq(dev_net(ifp->idev->dev), net))
1366 if (ipv6_addr_equal(&ifp->addr, addr)) {
1367 if (dev == NULL || ifp->idev->dev == dev ||
1368 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1375 rcu_read_unlock_bh();
1380 /* Gets referenced address, destroys ifaddr */
1382 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1384 if (ifp->flags&IFA_F_PERMANENT) {
1385 spin_lock_bh(&ifp->lock);
1386 addrconf_del_timer(ifp);
1387 ifp->flags |= IFA_F_TENTATIVE;
1389 ifp->flags |= IFA_F_DADFAILED;
1390 spin_unlock_bh(&ifp->lock);
1392 ipv6_ifa_notify(0, ifp);
1394 #ifdef CONFIG_IPV6_PRIVACY
1395 } else if (ifp->flags&IFA_F_TEMPORARY) {
1396 struct inet6_ifaddr *ifpub;
1397 spin_lock_bh(&ifp->lock);
1400 in6_ifa_hold(ifpub);
1401 spin_unlock_bh(&ifp->lock);
1402 ipv6_create_tempaddr(ifpub, ifp);
1405 spin_unlock_bh(&ifp->lock);
1413 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1417 spin_lock(&ifp->state_lock);
1418 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1419 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1422 spin_unlock(&ifp->state_lock);
1427 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1429 struct inet6_dev *idev = ifp->idev;
1431 if (addrconf_dad_end(ifp)) {
1436 if (net_ratelimit())
1437 printk(KERN_INFO "%s: IPv6 duplicate address %pI6c detected!\n",
1438 ifp->idev->dev->name, &ifp->addr);
1440 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1441 struct in6_addr addr;
1443 addr.s6_addr32[0] = htonl(0xfe800000);
1444 addr.s6_addr32[1] = 0;
1446 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1447 ipv6_addr_equal(&ifp->addr, &addr)) {
1448 /* DAD failed for link-local based on MAC address */
1449 idev->cnf.disable_ipv6 = 1;
1451 printk(KERN_INFO "%s: IPv6 being disabled!\n",
1452 ifp->idev->dev->name);
1456 addrconf_dad_stop(ifp, 1);
1459 /* Join to solicited addr multicast group. */
1461 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1463 struct in6_addr maddr;
1465 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1468 addrconf_addr_solict_mult(addr, &maddr);
1469 ipv6_dev_mc_inc(dev, &maddr);
1472 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1474 struct in6_addr maddr;
1476 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1479 addrconf_addr_solict_mult(addr, &maddr);
1480 __ipv6_dev_mc_dec(idev, &maddr);
1483 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1485 struct in6_addr addr;
1486 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1487 if (ipv6_addr_any(&addr))
1489 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1492 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1494 struct in6_addr addr;
1495 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1496 if (ipv6_addr_any(&addr))
1498 __ipv6_dev_ac_dec(ifp->idev, &addr);
1501 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1503 if (dev->addr_len != ETH_ALEN)
1505 memcpy(eui, dev->dev_addr, 3);
1506 memcpy(eui + 5, dev->dev_addr + 3, 3);
1509 * The zSeries OSA network cards can be shared among various
1510 * OS instances, but the OSA cards have only one MAC address.
1511 * This leads to duplicate address conflicts in conjunction
1512 * with IPv6 if more than one instance uses the same card.
1514 * The driver for these cards can deliver a unique 16-bit
1515 * identifier for each instance sharing the same card. It is
1516 * placed instead of 0xFFFE in the interface identifier. The
1517 * "u" bit of the interface identifier is not inverted in this
1518 * case. Hence the resulting interface identifier has local
1519 * scope according to RFC2373.
1522 eui[3] = (dev->dev_id >> 8) & 0xFF;
1523 eui[4] = dev->dev_id & 0xFF;
1532 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1534 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1535 if (dev->addr_len != ARCNET_ALEN)
1538 eui[7] = *(u8*)dev->dev_addr;
1542 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1544 if (dev->addr_len != INFINIBAND_ALEN)
1546 memcpy(eui, dev->dev_addr + 12, 8);
1551 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1555 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1556 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1557 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1558 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1559 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1560 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1564 memcpy(eui + 4, &addr, 4);
1568 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1570 if (dev->priv_flags & IFF_ISATAP)
1571 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1575 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1577 switch (dev->type) {
1580 case ARPHRD_IEEE802_TR:
1581 return addrconf_ifid_eui48(eui, dev);
1583 return addrconf_ifid_arcnet(eui, dev);
1584 case ARPHRD_INFINIBAND:
1585 return addrconf_ifid_infiniband(eui, dev);
1587 return addrconf_ifid_sit(eui, dev);
1592 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1595 struct inet6_ifaddr *ifp;
1597 read_lock_bh(&idev->lock);
1598 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1599 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1600 memcpy(eui, ifp->addr.s6_addr+8, 8);
1605 read_unlock_bh(&idev->lock);
1609 #ifdef CONFIG_IPV6_PRIVACY
1610 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1611 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1614 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1615 idev->rndid[0] &= ~0x02;
1618 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1619 * check if generated address is not inappropriate
1621 * - Reserved subnet anycast (RFC 2526)
1622 * 11111101 11....11 1xxxxxxx
1623 * - ISATAP (RFC4214) 6.1
1624 * 00-00-5E-FE-xx-xx-xx-xx
1626 * - XXX: already assigned to an address on the device
1628 if (idev->rndid[0] == 0xfd &&
1629 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1630 (idev->rndid[7]&0x80))
1632 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1633 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1635 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1642 static void ipv6_regen_rndid(unsigned long data)
1644 struct inet6_dev *idev = (struct inet6_dev *) data;
1645 unsigned long expires;
1648 write_lock_bh(&idev->lock);
1653 if (__ipv6_regen_rndid(idev) < 0)
1657 idev->cnf.temp_prefered_lft * HZ -
1658 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1659 idev->cnf.max_desync_factor * HZ;
1660 if (time_before(expires, jiffies)) {
1662 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1667 if (!mod_timer(&idev->regen_timer, expires))
1671 write_unlock_bh(&idev->lock);
1672 rcu_read_unlock_bh();
1676 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1679 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1680 ret = __ipv6_regen_rndid(idev);
1690 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1691 unsigned long expires, u32 flags)
1693 struct fib6_config cfg = {
1694 .fc_table = RT6_TABLE_PREFIX,
1695 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1696 .fc_ifindex = dev->ifindex,
1697 .fc_expires = expires,
1699 .fc_flags = RTF_UP | flags,
1700 .fc_nlinfo.nl_net = dev_net(dev),
1701 .fc_protocol = RTPROT_KERNEL,
1704 ipv6_addr_copy(&cfg.fc_dst, pfx);
1706 /* Prevent useless cloning on PtP SIT.
1707 This thing is done here expecting that the whole
1708 class of non-broadcast devices need not cloning.
1710 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1711 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1712 cfg.fc_flags |= RTF_NONEXTHOP;
1715 ip6_route_add(&cfg);
1718 /* Create "default" multicast route to the interface */
1720 static void addrconf_add_mroute(struct net_device *dev)
1722 struct fib6_config cfg = {
1723 .fc_table = RT6_TABLE_LOCAL,
1724 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1725 .fc_ifindex = dev->ifindex,
1728 .fc_nlinfo.nl_net = dev_net(dev),
1731 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1733 ip6_route_add(&cfg);
1736 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1737 static void sit_route_add(struct net_device *dev)
1739 struct fib6_config cfg = {
1740 .fc_table = RT6_TABLE_MAIN,
1741 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1742 .fc_ifindex = dev->ifindex,
1744 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1745 .fc_nlinfo.nl_net = dev_net(dev),
1748 /* prefix length - 96 bits "::d.d.d.d" */
1749 ip6_route_add(&cfg);
1753 static void addrconf_add_lroute(struct net_device *dev)
1755 struct in6_addr addr;
1757 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1758 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1761 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1763 struct inet6_dev *idev;
1767 idev = ipv6_find_idev(dev);
1769 return ERR_PTR(-ENOBUFS);
1771 if (idev->cnf.disable_ipv6)
1772 return ERR_PTR(-EACCES);
1774 /* Add default multicast route */
1775 addrconf_add_mroute(dev);
1777 /* Add link local route */
1778 addrconf_add_lroute(dev);
1782 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1784 struct prefix_info *pinfo;
1788 struct inet6_dev *in6_dev;
1789 struct net *net = dev_net(dev);
1791 pinfo = (struct prefix_info *) opt;
1793 if (len < sizeof(struct prefix_info)) {
1794 ADBG(("addrconf: prefix option too short\n"));
1799 * Validation checks ([ADDRCONF], page 19)
1802 addr_type = ipv6_addr_type(&pinfo->prefix);
1804 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1807 valid_lft = ntohl(pinfo->valid);
1808 prefered_lft = ntohl(pinfo->prefered);
1810 if (prefered_lft > valid_lft) {
1811 if (net_ratelimit())
1812 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1816 in6_dev = in6_dev_get(dev);
1818 if (in6_dev == NULL) {
1819 if (net_ratelimit())
1820 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1825 * Two things going on here:
1826 * 1) Add routes for on-link prefixes
1827 * 2) Configure prefixes with the auto flag set
1830 if (pinfo->onlink) {
1831 struct rt6_info *rt;
1832 unsigned long rt_expires;
1834 /* Avoid arithmetic overflow. Really, we could
1835 * save rt_expires in seconds, likely valid_lft,
1836 * but it would require division in fib gc, that it
1840 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1842 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
1844 if (addrconf_finite_timeout(rt_expires))
1847 rt = rt6_lookup(net, &pinfo->prefix, NULL,
1850 if (rt && addrconf_is_prefix_route(rt)) {
1851 /* Autoconf prefix route */
1852 if (valid_lft == 0) {
1855 } else if (addrconf_finite_timeout(rt_expires)) {
1857 rt->rt6i_expires = jiffies + rt_expires;
1858 rt->rt6i_flags |= RTF_EXPIRES;
1860 rt->rt6i_flags &= ~RTF_EXPIRES;
1861 rt->rt6i_expires = 0;
1863 } else if (valid_lft) {
1864 clock_t expires = 0;
1865 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1866 if (addrconf_finite_timeout(rt_expires)) {
1868 flags |= RTF_EXPIRES;
1869 expires = jiffies_to_clock_t(rt_expires);
1871 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1872 dev, expires, flags);
1875 dst_release(&rt->dst);
1878 /* Try to figure out our local address for this prefix */
1880 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1881 struct inet6_ifaddr * ifp;
1882 struct in6_addr addr;
1883 int create = 0, update_lft = 0;
1885 if (pinfo->prefix_len == 64) {
1886 memcpy(&addr, &pinfo->prefix, 8);
1887 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1888 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1889 in6_dev_put(in6_dev);
1894 if (net_ratelimit())
1895 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1897 in6_dev_put(in6_dev);
1902 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1904 if (ifp == NULL && valid_lft) {
1905 int max_addresses = in6_dev->cnf.max_addresses;
1908 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1909 if (in6_dev->cnf.optimistic_dad &&
1910 !net->ipv6.devconf_all->forwarding)
1911 addr_flags = IFA_F_OPTIMISTIC;
1914 /* Do not allow to create too much of autoconfigured
1915 * addresses; this would be too easy way to crash kernel.
1917 if (!max_addresses ||
1918 ipv6_count_addresses(in6_dev) < max_addresses)
1919 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1920 addr_type&IPV6_ADDR_SCOPE_MASK,
1923 if (!ifp || IS_ERR(ifp)) {
1924 in6_dev_put(in6_dev);
1928 update_lft = create = 1;
1929 ifp->cstamp = jiffies;
1930 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1936 #ifdef CONFIG_IPV6_PRIVACY
1937 struct inet6_ifaddr *ift;
1941 /* update lifetime (RFC2462 5.5.3 e) */
1942 spin_lock(&ifp->lock);
1944 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1945 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1948 if (!update_lft && stored_lft) {
1949 if (valid_lft > MIN_VALID_LIFETIME ||
1950 valid_lft > stored_lft)
1952 else if (stored_lft <= MIN_VALID_LIFETIME) {
1953 /* valid_lft <= stored_lft is always true */
1955 * RFC 4862 Section 5.5.3e:
1956 * "Note that the preferred lifetime of
1957 * the corresponding address is always
1958 * reset to the Preferred Lifetime in
1959 * the received Prefix Information
1960 * option, regardless of whether the
1961 * valid lifetime is also reset or
1964 * So if the preferred lifetime in
1965 * this advertisement is different
1966 * than what we have stored, but the
1967 * valid lifetime is invalid, just
1968 * reset prefered_lft.
1970 * We must set the valid lifetime
1971 * to the stored lifetime since we'll
1972 * be updating the timestamp below,
1973 * else we'll set it back to the
1976 if (prefered_lft != ifp->prefered_lft) {
1977 valid_lft = stored_lft;
1981 valid_lft = MIN_VALID_LIFETIME;
1982 if (valid_lft < prefered_lft)
1983 prefered_lft = valid_lft;
1989 ifp->valid_lft = valid_lft;
1990 ifp->prefered_lft = prefered_lft;
1993 ifp->flags &= ~IFA_F_DEPRECATED;
1994 spin_unlock(&ifp->lock);
1996 if (!(flags&IFA_F_TENTATIVE))
1997 ipv6_ifa_notify(0, ifp);
1999 spin_unlock(&ifp->lock);
2001 #ifdef CONFIG_IPV6_PRIVACY
2002 read_lock_bh(&in6_dev->lock);
2003 /* update all temporary addresses in the list */
2004 list_for_each_entry(ift, &in6_dev->tempaddr_list, tmp_list) {
2006 * When adjusting the lifetimes of an existing
2007 * temporary address, only lower the lifetimes.
2008 * Implementations must not increase the
2009 * lifetimes of an existing temporary address
2010 * when processing a Prefix Information Option.
2012 if (ifp != ift->ifpub)
2015 spin_lock(&ift->lock);
2017 if (ift->valid_lft > valid_lft &&
2018 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
2019 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
2020 if (ift->prefered_lft > prefered_lft &&
2021 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
2022 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
2023 spin_unlock(&ift->lock);
2024 if (!(flags&IFA_F_TENTATIVE))
2025 ipv6_ifa_notify(0, ift);
2028 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
2030 * When a new public address is created as described in [ADDRCONF],
2031 * also create a new temporary address. Also create a temporary
2032 * address if it's enabled but no temporary address currently exists.
2034 read_unlock_bh(&in6_dev->lock);
2035 ipv6_create_tempaddr(ifp, NULL);
2037 read_unlock_bh(&in6_dev->lock);
2044 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2045 in6_dev_put(in6_dev);
2049 * Set destination address.
2050 * Special case for SIT interfaces where we create a new "virtual"
2053 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2055 struct in6_ifreq ireq;
2056 struct net_device *dev;
2062 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2065 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2071 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2072 if (dev->type == ARPHRD_SIT) {
2073 const struct net_device_ops *ops = dev->netdev_ops;
2075 struct ip_tunnel_parm p;
2077 err = -EADDRNOTAVAIL;
2078 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2081 memset(&p, 0, sizeof(p));
2082 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2086 p.iph.protocol = IPPROTO_IPV6;
2088 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2090 if (ops->ndo_do_ioctl) {
2091 mm_segment_t oldfs = get_fs();
2094 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2101 dev = __dev_get_by_name(net, p.name);
2104 err = dev_open(dev);
2115 * Manual configuration of address on an interface
2117 static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx,
2118 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2121 struct inet6_ifaddr *ifp;
2122 struct inet6_dev *idev;
2123 struct net_device *dev;
2127 unsigned long timeout;
2134 /* check the lifetime */
2135 if (!valid_lft || prefered_lft > valid_lft)
2138 dev = __dev_get_by_index(net, ifindex);
2142 idev = addrconf_add_dev(dev);
2144 return PTR_ERR(idev);
2146 scope = ipv6_addr_scope(pfx);
2148 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2149 if (addrconf_finite_timeout(timeout)) {
2150 expires = jiffies_to_clock_t(timeout * HZ);
2151 valid_lft = timeout;
2152 flags = RTF_EXPIRES;
2156 ifa_flags |= IFA_F_PERMANENT;
2159 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2160 if (addrconf_finite_timeout(timeout)) {
2162 ifa_flags |= IFA_F_DEPRECATED;
2163 prefered_lft = timeout;
2166 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2169 spin_lock_bh(&ifp->lock);
2170 ifp->valid_lft = valid_lft;
2171 ifp->prefered_lft = prefered_lft;
2172 ifp->tstamp = jiffies;
2173 spin_unlock_bh(&ifp->lock);
2175 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2178 * Note that section 3.1 of RFC 4429 indicates
2179 * that the Optimistic flag should not be set for
2180 * manually configured addresses
2182 addrconf_dad_start(ifp, 0);
2188 return PTR_ERR(ifp);
2191 static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx,
2194 struct inet6_ifaddr *ifp;
2195 struct inet6_dev *idev;
2196 struct net_device *dev;
2201 dev = __dev_get_by_index(net, ifindex);
2205 if ((idev = __in6_dev_get(dev)) == NULL)
2208 read_lock_bh(&idev->lock);
2209 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2210 if (ifp->prefix_len == plen &&
2211 ipv6_addr_equal(pfx, &ifp->addr)) {
2213 read_unlock_bh(&idev->lock);
2217 /* If the last address is deleted administratively,
2218 disable IPv6 on this interface.
2220 if (list_empty(&idev->addr_list))
2221 addrconf_ifdown(idev->dev, 1);
2225 read_unlock_bh(&idev->lock);
2226 return -EADDRNOTAVAIL;
2230 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2232 struct in6_ifreq ireq;
2235 if (!capable(CAP_NET_ADMIN))
2238 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2242 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2243 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2244 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2249 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2251 struct in6_ifreq ireq;
2254 if (!capable(CAP_NET_ADMIN))
2257 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2261 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2262 ireq.ifr6_prefixlen);
2267 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2268 int plen, int scope)
2270 struct inet6_ifaddr *ifp;
2272 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2274 spin_lock_bh(&ifp->lock);
2275 ifp->flags &= ~IFA_F_TENTATIVE;
2276 spin_unlock_bh(&ifp->lock);
2277 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2282 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2283 static void sit_add_v4_addrs(struct inet6_dev *idev)
2285 struct in6_addr addr;
2286 struct net_device *dev;
2287 struct net *net = dev_net(idev->dev);
2292 memset(&addr, 0, sizeof(struct in6_addr));
2293 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2295 if (idev->dev->flags&IFF_POINTOPOINT) {
2296 addr.s6_addr32[0] = htonl(0xfe800000);
2299 scope = IPV6_ADDR_COMPATv4;
2302 if (addr.s6_addr32[3]) {
2303 add_addr(idev, &addr, 128, scope);
2307 for_each_netdev(net, dev) {
2308 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2309 if (in_dev && (dev->flags & IFF_UP)) {
2310 struct in_ifaddr * ifa;
2314 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2317 addr.s6_addr32[3] = ifa->ifa_local;
2319 if (ifa->ifa_scope == RT_SCOPE_LINK)
2321 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2322 if (idev->dev->flags&IFF_POINTOPOINT)
2326 if (idev->dev->flags&IFF_POINTOPOINT)
2331 add_addr(idev, &addr, plen, flag);
2338 static void init_loopback(struct net_device *dev)
2340 struct inet6_dev *idev;
2346 if ((idev = ipv6_find_idev(dev)) == NULL) {
2347 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2351 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2354 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2356 struct inet6_ifaddr * ifp;
2357 u32 addr_flags = IFA_F_PERMANENT;
2359 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2360 if (idev->cnf.optimistic_dad &&
2361 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2362 addr_flags |= IFA_F_OPTIMISTIC;
2366 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2368 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2369 addrconf_dad_start(ifp, 0);
2374 static void addrconf_dev_config(struct net_device *dev)
2376 struct in6_addr addr;
2377 struct inet6_dev * idev;
2381 if ((dev->type != ARPHRD_ETHER) &&
2382 (dev->type != ARPHRD_FDDI) &&
2383 (dev->type != ARPHRD_IEEE802_TR) &&
2384 (dev->type != ARPHRD_ARCNET) &&
2385 (dev->type != ARPHRD_INFINIBAND)) {
2386 /* Alas, we support only Ethernet autoconfiguration. */
2390 idev = addrconf_add_dev(dev);
2394 memset(&addr, 0, sizeof(struct in6_addr));
2395 addr.s6_addr32[0] = htonl(0xFE800000);
2397 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2398 addrconf_add_linklocal(idev, &addr);
2401 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2402 static void addrconf_sit_config(struct net_device *dev)
2404 struct inet6_dev *idev;
2409 * Configure the tunnel with one of our IPv4
2410 * addresses... we should configure all of
2411 * our v4 addrs in the tunnel
2414 if ((idev = ipv6_find_idev(dev)) == NULL) {
2415 printk(KERN_DEBUG "init sit: add_dev failed\n");
2419 if (dev->priv_flags & IFF_ISATAP) {
2420 struct in6_addr addr;
2422 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2423 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2424 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2425 addrconf_add_linklocal(idev, &addr);
2429 sit_add_v4_addrs(idev);
2431 if (dev->flags&IFF_POINTOPOINT) {
2432 addrconf_add_mroute(dev);
2433 addrconf_add_lroute(dev);
2440 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2442 struct in6_addr lladdr;
2444 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2445 addrconf_add_linklocal(idev, &lladdr);
2451 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2453 struct net_device *link_dev;
2454 struct net *net = dev_net(idev->dev);
2456 /* first try to inherit the link-local address from the link device */
2457 if (idev->dev->iflink &&
2458 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2459 if (!ipv6_inherit_linklocal(idev, link_dev))
2462 /* then try to inherit it from any device */
2463 for_each_netdev(net, link_dev) {
2464 if (!ipv6_inherit_linklocal(idev, link_dev))
2467 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2471 * Autoconfigure tunnel with a link-local address so routing protocols,
2472 * DHCPv6, MLD etc. can be run over the virtual link
2475 static void addrconf_ip6_tnl_config(struct net_device *dev)
2477 struct inet6_dev *idev;
2481 idev = addrconf_add_dev(dev);
2483 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2486 ip6_tnl_add_linklocal(idev);
2489 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2492 struct net_device *dev = (struct net_device *) data;
2493 struct inet6_dev *idev = __in6_dev_get(dev);
2494 int run_pending = 0;
2498 case NETDEV_REGISTER:
2499 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2500 idev = ipv6_add_dev(dev);
2502 return notifier_from_errno(-ENOMEM);
2508 if (dev->flags & IFF_SLAVE)
2511 if (event == NETDEV_UP) {
2512 if (!addrconf_qdisc_ok(dev)) {
2513 /* device is not ready yet. */
2515 "ADDRCONF(NETDEV_UP): %s: "
2516 "link is not ready\n",
2521 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2522 idev = ipv6_add_dev(dev);
2525 idev->if_flags |= IF_READY;
2529 if (!addrconf_qdisc_ok(dev)) {
2530 /* device is still not ready. */
2535 if (idev->if_flags & IF_READY)
2536 /* device is already configured. */
2538 idev->if_flags |= IF_READY;
2542 "ADDRCONF(NETDEV_CHANGE): %s: "
2543 "link becomes ready\n",
2549 switch (dev->type) {
2550 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2552 addrconf_sit_config(dev);
2555 case ARPHRD_TUNNEL6:
2556 addrconf_ip6_tnl_config(dev);
2558 case ARPHRD_LOOPBACK:
2563 addrconf_dev_config(dev);
2569 addrconf_dad_run(idev);
2572 * If the MTU changed during the interface down,
2573 * when the interface up, the changed MTU must be
2574 * reflected in the idev as well as routers.
2576 if (idev->cnf.mtu6 != dev->mtu &&
2577 dev->mtu >= IPV6_MIN_MTU) {
2578 rt6_mtu_change(dev, dev->mtu);
2579 idev->cnf.mtu6 = dev->mtu;
2581 idev->tstamp = jiffies;
2582 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2585 * If the changed mtu during down is lower than
2586 * IPV6_MIN_MTU stop IPv6 on this interface.
2588 if (dev->mtu < IPV6_MIN_MTU)
2589 addrconf_ifdown(dev, 1);
2593 case NETDEV_CHANGEMTU:
2594 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2595 rt6_mtu_change(dev, dev->mtu);
2596 idev->cnf.mtu6 = dev->mtu;
2600 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2601 idev = ipv6_add_dev(dev);
2607 * MTU falled under IPV6_MIN_MTU.
2608 * Stop IPv6 on this interface.
2612 case NETDEV_UNREGISTER:
2614 * Remove all addresses from this interface.
2616 addrconf_ifdown(dev, event != NETDEV_DOWN);
2619 case NETDEV_CHANGENAME:
2621 snmp6_unregister_dev(idev);
2622 addrconf_sysctl_unregister(idev);
2623 addrconf_sysctl_register(idev);
2624 err = snmp6_register_dev(idev);
2626 return notifier_from_errno(err);
2630 case NETDEV_PRE_TYPE_CHANGE:
2631 case NETDEV_POST_TYPE_CHANGE:
2632 addrconf_type_change(dev, event);
2640 * addrconf module should be notified of a device going up
2642 static struct notifier_block ipv6_dev_notf = {
2643 .notifier_call = addrconf_notify,
2646 static void addrconf_type_change(struct net_device *dev, unsigned long event)
2648 struct inet6_dev *idev;
2651 idev = __in6_dev_get(dev);
2653 if (event == NETDEV_POST_TYPE_CHANGE)
2654 ipv6_mc_remap(idev);
2655 else if (event == NETDEV_PRE_TYPE_CHANGE)
2656 ipv6_mc_unmap(idev);
2659 static int addrconf_ifdown(struct net_device *dev, int how)
2661 struct net *net = dev_net(dev);
2662 struct inet6_dev *idev;
2663 struct inet6_ifaddr *ifa;
2668 rt6_ifdown(net, dev);
2669 neigh_ifdown(&nd_tbl, dev);
2671 idev = __in6_dev_get(dev);
2676 * Step 1: remove reference to ipv6 device from parent device.
2682 /* protected by rtnl_lock */
2683 rcu_assign_pointer(dev->ip6_ptr, NULL);
2685 /* Step 1.5: remove snmp6 entry */
2686 snmp6_unregister_dev(idev);
2690 /* Step 2: clear hash table */
2691 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
2692 struct hlist_head *h = &inet6_addr_lst[i];
2693 struct hlist_node *n;
2695 spin_lock_bh(&addrconf_hash_lock);
2697 hlist_for_each_entry_rcu(ifa, n, h, addr_lst) {
2698 if (ifa->idev == idev) {
2699 hlist_del_init_rcu(&ifa->addr_lst);
2700 addrconf_del_timer(ifa);
2704 spin_unlock_bh(&addrconf_hash_lock);
2707 write_lock_bh(&idev->lock);
2709 /* Step 2: clear flags for stateless addrconf */
2711 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2713 #ifdef CONFIG_IPV6_PRIVACY
2714 if (how && del_timer(&idev->regen_timer))
2717 /* Step 3: clear tempaddr list */
2718 while (!list_empty(&idev->tempaddr_list)) {
2719 ifa = list_first_entry(&idev->tempaddr_list,
2720 struct inet6_ifaddr, tmp_list);
2721 list_del(&ifa->tmp_list);
2722 write_unlock_bh(&idev->lock);
2723 spin_lock_bh(&ifa->lock);
2726 in6_ifa_put(ifa->ifpub);
2729 spin_unlock_bh(&ifa->lock);
2731 write_lock_bh(&idev->lock);
2735 while (!list_empty(&idev->addr_list)) {
2736 ifa = list_first_entry(&idev->addr_list,
2737 struct inet6_ifaddr, if_list);
2738 addrconf_del_timer(ifa);
2740 list_del(&ifa->if_list);
2742 write_unlock_bh(&idev->lock);
2744 spin_lock_bh(&ifa->state_lock);
2746 ifa->state = INET6_IFADDR_STATE_DEAD;
2747 spin_unlock_bh(&ifa->state_lock);
2749 if (state != INET6_IFADDR_STATE_DEAD) {
2750 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2751 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2755 write_lock_bh(&idev->lock);
2758 write_unlock_bh(&idev->lock);
2760 /* Step 5: Discard multicast list */
2762 ipv6_mc_destroy_dev(idev);
2766 idev->tstamp = jiffies;
2768 /* Last: Shot the device (if unregistered) */
2770 addrconf_sysctl_unregister(idev);
2771 neigh_parms_release(&nd_tbl, idev->nd_parms);
2772 neigh_ifdown(&nd_tbl, dev);
2778 static void addrconf_rs_timer(unsigned long data)
2780 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2781 struct inet6_dev *idev = ifp->idev;
2783 read_lock(&idev->lock);
2784 if (idev->dead || !(idev->if_flags & IF_READY))
2787 if (idev->cnf.forwarding)
2790 /* Announcement received after solicitation was sent */
2791 if (idev->if_flags & IF_RA_RCVD)
2794 spin_lock(&ifp->lock);
2795 if (ifp->probes++ < idev->cnf.rtr_solicits) {
2796 /* The wait after the last probe can be shorter */
2797 addrconf_mod_timer(ifp, AC_RS,
2798 (ifp->probes == idev->cnf.rtr_solicits) ?
2799 idev->cnf.rtr_solicit_delay :
2800 idev->cnf.rtr_solicit_interval);
2801 spin_unlock(&ifp->lock);
2803 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2805 spin_unlock(&ifp->lock);
2807 * Note: we do not support deprecated "all on-link"
2808 * assumption any longer.
2810 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2815 read_unlock(&idev->lock);
2820 * Duplicate Address Detection
2822 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2824 unsigned long rand_num;
2825 struct inet6_dev *idev = ifp->idev;
2827 if (ifp->flags & IFA_F_OPTIMISTIC)
2830 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2832 ifp->probes = idev->cnf.dad_transmits;
2833 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2836 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2838 struct inet6_dev *idev = ifp->idev;
2839 struct net_device *dev = idev->dev;
2841 addrconf_join_solict(dev, &ifp->addr);
2843 net_srandom(ifp->addr.s6_addr32[3]);
2845 read_lock_bh(&idev->lock);
2846 spin_lock(&ifp->lock);
2847 if (ifp->state == INET6_IFADDR_STATE_DEAD)
2850 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2851 idev->cnf.accept_dad < 1 ||
2852 !(ifp->flags&IFA_F_TENTATIVE) ||
2853 ifp->flags & IFA_F_NODAD) {
2854 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2855 spin_unlock(&ifp->lock);
2856 read_unlock_bh(&idev->lock);
2858 addrconf_dad_completed(ifp);
2862 if (!(idev->if_flags & IF_READY)) {
2863 spin_unlock(&ifp->lock);
2864 read_unlock_bh(&idev->lock);
2866 * If the device is not ready:
2867 * - keep it tentative if it is a permanent address.
2868 * - otherwise, kill it.
2871 addrconf_dad_stop(ifp, 0);
2876 * Optimistic nodes can start receiving
2879 if (ifp->flags & IFA_F_OPTIMISTIC)
2880 ip6_ins_rt(ifp->rt);
2882 addrconf_dad_kick(ifp);
2884 spin_unlock(&ifp->lock);
2885 read_unlock_bh(&idev->lock);
2888 static void addrconf_dad_timer(unsigned long data)
2890 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2891 struct inet6_dev *idev = ifp->idev;
2892 struct in6_addr mcaddr;
2894 if (!ifp->probes && addrconf_dad_end(ifp))
2897 read_lock(&idev->lock);
2898 if (idev->dead || !(idev->if_flags & IF_READY)) {
2899 read_unlock(&idev->lock);
2903 spin_lock(&ifp->lock);
2904 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
2905 spin_unlock(&ifp->lock);
2906 read_unlock(&idev->lock);
2910 if (ifp->probes == 0) {
2912 * DAD was successful
2915 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2916 spin_unlock(&ifp->lock);
2917 read_unlock(&idev->lock);
2919 addrconf_dad_completed(ifp);
2925 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2926 spin_unlock(&ifp->lock);
2927 read_unlock(&idev->lock);
2929 /* send a neighbour solicitation for our addr */
2930 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2931 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
2936 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2938 struct net_device *dev = ifp->idev->dev;
2941 * Configure the address for reception. Now it is valid.
2944 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2946 /* If added prefix is link local and forwarding is off,
2947 start sending router solicitations.
2950 if ((ifp->idev->cnf.forwarding == 0 ||
2951 ifp->idev->cnf.forwarding == 2) &&
2952 ifp->idev->cnf.rtr_solicits > 0 &&
2953 (dev->flags&IFF_LOOPBACK) == 0 &&
2954 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2956 * If a host as already performed a random delay
2957 * [...] as part of DAD [...] there is no need
2958 * to delay again before sending the first RS
2960 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2962 spin_lock_bh(&ifp->lock);
2964 ifp->idev->if_flags |= IF_RS_SENT;
2965 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2966 spin_unlock_bh(&ifp->lock);
2970 static void addrconf_dad_run(struct inet6_dev *idev)
2972 struct inet6_ifaddr *ifp;
2974 read_lock_bh(&idev->lock);
2975 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2976 spin_lock(&ifp->lock);
2977 if (ifp->flags & IFA_F_TENTATIVE &&
2978 ifp->state == INET6_IFADDR_STATE_DAD)
2979 addrconf_dad_kick(ifp);
2980 spin_unlock(&ifp->lock);
2982 read_unlock_bh(&idev->lock);
2985 #ifdef CONFIG_PROC_FS
2986 struct if6_iter_state {
2987 struct seq_net_private p;
2991 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2993 struct inet6_ifaddr *ifa = NULL;
2994 struct if6_iter_state *state = seq->private;
2995 struct net *net = seq_file_net(seq);
2997 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2998 struct hlist_node *n;
2999 hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket],
3001 if (net_eq(dev_net(ifa->idev->dev), net))
3007 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3008 struct inet6_ifaddr *ifa)
3010 struct if6_iter_state *state = seq->private;
3011 struct net *net = seq_file_net(seq);
3012 struct hlist_node *n = &ifa->addr_lst;
3014 hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst)
3015 if (net_eq(dev_net(ifa->idev->dev), net))
3018 while (++state->bucket < IN6_ADDR_HSIZE) {
3019 hlist_for_each_entry_rcu_bh(ifa, n,
3020 &inet6_addr_lst[state->bucket], addr_lst) {
3021 if (net_eq(dev_net(ifa->idev->dev), net))
3029 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
3031 struct inet6_ifaddr *ifa = if6_get_first(seq);
3034 while (pos && (ifa = if6_get_next(seq, ifa)) != NULL)
3036 return pos ? NULL : ifa;
3039 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3043 return if6_get_idx(seq, *pos);
3046 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3048 struct inet6_ifaddr *ifa;
3050 ifa = if6_get_next(seq, v);
3055 static void if6_seq_stop(struct seq_file *seq, void *v)
3058 rcu_read_unlock_bh();
3061 static int if6_seq_show(struct seq_file *seq, void *v)
3063 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3064 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3066 ifp->idev->dev->ifindex,
3070 ifp->idev->dev->name);
3074 static const struct seq_operations if6_seq_ops = {
3075 .start = if6_seq_start,
3076 .next = if6_seq_next,
3077 .show = if6_seq_show,
3078 .stop = if6_seq_stop,
3081 static int if6_seq_open(struct inode *inode, struct file *file)
3083 return seq_open_net(inode, file, &if6_seq_ops,
3084 sizeof(struct if6_iter_state));
3087 static const struct file_operations if6_fops = {
3088 .owner = THIS_MODULE,
3089 .open = if6_seq_open,
3091 .llseek = seq_lseek,
3092 .release = seq_release_net,
3095 static int __net_init if6_proc_net_init(struct net *net)
3097 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
3102 static void __net_exit if6_proc_net_exit(struct net *net)
3104 proc_net_remove(net, "if_inet6");
3107 static struct pernet_operations if6_proc_net_ops = {
3108 .init = if6_proc_net_init,
3109 .exit = if6_proc_net_exit,
3112 int __init if6_proc_init(void)
3114 return register_pernet_subsys(&if6_proc_net_ops);
3117 void if6_proc_exit(void)
3119 unregister_pernet_subsys(&if6_proc_net_ops);
3121 #endif /* CONFIG_PROC_FS */
3123 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3124 /* Check if address is a home address configured on any interface. */
3125 int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
3128 struct inet6_ifaddr *ifp = NULL;
3129 struct hlist_node *n;
3130 unsigned int hash = ipv6_addr_hash(addr);
3133 hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) {
3134 if (!net_eq(dev_net(ifp->idev->dev), net))
3136 if (ipv6_addr_equal(&ifp->addr, addr) &&
3137 (ifp->flags & IFA_F_HOMEADDRESS)) {
3142 rcu_read_unlock_bh();
3148 * Periodic address status verification
3151 static void addrconf_verify(unsigned long foo)
3153 unsigned long now, next, next_sec, next_sched;
3154 struct inet6_ifaddr *ifp;
3155 struct hlist_node *node;
3159 spin_lock(&addrconf_verify_lock);
3161 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3163 del_timer(&addr_chk_timer);
3165 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3167 hlist_for_each_entry_rcu_bh(ifp, node,
3168 &inet6_addr_lst[i], addr_lst) {
3171 if (ifp->flags & IFA_F_PERMANENT)
3174 spin_lock(&ifp->lock);
3175 /* We try to batch several events at once. */
3176 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3178 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3179 age >= ifp->valid_lft) {
3180 spin_unlock(&ifp->lock);
3184 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3185 spin_unlock(&ifp->lock);
3187 } else if (age >= ifp->prefered_lft) {
3188 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3191 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3193 ifp->flags |= IFA_F_DEPRECATED;
3196 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3197 next = ifp->tstamp + ifp->valid_lft * HZ;
3199 spin_unlock(&ifp->lock);
3204 ipv6_ifa_notify(0, ifp);
3208 #ifdef CONFIG_IPV6_PRIVACY
3209 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3210 !(ifp->flags&IFA_F_TENTATIVE)) {
3211 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3212 ifp->idev->cnf.dad_transmits *
3213 ifp->idev->nd_parms->retrans_time / HZ;
3215 if (age >= ifp->prefered_lft - regen_advance) {
3216 struct inet6_ifaddr *ifpub = ifp->ifpub;
3217 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3218 next = ifp->tstamp + ifp->prefered_lft * HZ;
3219 if (!ifp->regen_count && ifpub) {
3222 in6_ifa_hold(ifpub);
3223 spin_unlock(&ifp->lock);
3225 spin_lock(&ifpub->lock);
3226 ifpub->regen_count = 0;
3227 spin_unlock(&ifpub->lock);
3228 ipv6_create_tempaddr(ifpub, ifp);
3233 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3234 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3235 spin_unlock(&ifp->lock);
3238 /* ifp->prefered_lft <= ifp->valid_lft */
3239 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3240 next = ifp->tstamp + ifp->prefered_lft * HZ;
3241 spin_unlock(&ifp->lock);
3246 next_sec = round_jiffies_up(next);
3249 /* If rounded timeout is accurate enough, accept it. */
3250 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3251 next_sched = next_sec;
3253 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3254 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3255 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3257 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3258 now, next, next_sec, next_sched));
3260 addr_chk_timer.expires = next_sched;
3261 add_timer(&addr_chk_timer);
3262 spin_unlock(&addrconf_verify_lock);
3263 rcu_read_unlock_bh();
3266 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3268 struct in6_addr *pfx = NULL;
3271 pfx = nla_data(addr);
3274 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3277 pfx = nla_data(local);
3283 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3284 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3285 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3286 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3290 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3292 struct net *net = sock_net(skb->sk);
3293 struct ifaddrmsg *ifm;
3294 struct nlattr *tb[IFA_MAX+1];
3295 struct in6_addr *pfx;
3298 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3302 ifm = nlmsg_data(nlh);
3303 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3307 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3310 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3311 u32 prefered_lft, u32 valid_lft)
3315 unsigned long timeout;
3317 if (!valid_lft || (prefered_lft > valid_lft))
3320 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3321 if (addrconf_finite_timeout(timeout)) {
3322 expires = jiffies_to_clock_t(timeout * HZ);
3323 valid_lft = timeout;
3324 flags = RTF_EXPIRES;
3328 ifa_flags |= IFA_F_PERMANENT;
3331 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3332 if (addrconf_finite_timeout(timeout)) {
3334 ifa_flags |= IFA_F_DEPRECATED;
3335 prefered_lft = timeout;
3338 spin_lock_bh(&ifp->lock);
3339 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3340 ifp->tstamp = jiffies;
3341 ifp->valid_lft = valid_lft;
3342 ifp->prefered_lft = prefered_lft;
3344 spin_unlock_bh(&ifp->lock);
3345 if (!(ifp->flags&IFA_F_TENTATIVE))
3346 ipv6_ifa_notify(0, ifp);
3348 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3356 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3358 struct net *net = sock_net(skb->sk);
3359 struct ifaddrmsg *ifm;
3360 struct nlattr *tb[IFA_MAX+1];
3361 struct in6_addr *pfx;
3362 struct inet6_ifaddr *ifa;
3363 struct net_device *dev;
3364 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3368 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3372 ifm = nlmsg_data(nlh);
3373 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3377 if (tb[IFA_CACHEINFO]) {
3378 struct ifa_cacheinfo *ci;
3380 ci = nla_data(tb[IFA_CACHEINFO]);
3381 valid_lft = ci->ifa_valid;
3382 preferred_lft = ci->ifa_prefered;
3384 preferred_lft = INFINITY_LIFE_TIME;
3385 valid_lft = INFINITY_LIFE_TIME;
3388 dev = __dev_get_by_index(net, ifm->ifa_index);
3392 /* We ignore other flags so far. */
3393 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3395 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3398 * It would be best to check for !NLM_F_CREATE here but
3399 * userspace alreay relies on not having to provide this.
3401 return inet6_addr_add(net, ifm->ifa_index, pfx,
3402 ifm->ifa_prefixlen, ifa_flags,
3403 preferred_lft, valid_lft);
3406 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3407 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3410 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3417 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3418 u8 scope, int ifindex)
3420 struct ifaddrmsg *ifm;
3422 ifm = nlmsg_data(nlh);
3423 ifm->ifa_family = AF_INET6;
3424 ifm->ifa_prefixlen = prefixlen;
3425 ifm->ifa_flags = flags;
3426 ifm->ifa_scope = scope;
3427 ifm->ifa_index = ifindex;
3430 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3431 unsigned long tstamp, u32 preferred, u32 valid)
3433 struct ifa_cacheinfo ci;
3435 ci.cstamp = cstamp_delta(cstamp);
3436 ci.tstamp = cstamp_delta(tstamp);
3437 ci.ifa_prefered = preferred;
3438 ci.ifa_valid = valid;
3440 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3443 static inline int rt_scope(int ifa_scope)
3445 if (ifa_scope & IFA_HOST)
3446 return RT_SCOPE_HOST;
3447 else if (ifa_scope & IFA_LINK)
3448 return RT_SCOPE_LINK;
3449 else if (ifa_scope & IFA_SITE)
3450 return RT_SCOPE_SITE;
3452 return RT_SCOPE_UNIVERSE;
3455 static inline int inet6_ifaddr_msgsize(void)
3457 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3458 + nla_total_size(16) /* IFA_ADDRESS */
3459 + nla_total_size(sizeof(struct ifa_cacheinfo));
3462 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3463 u32 pid, u32 seq, int event, unsigned int flags)
3465 struct nlmsghdr *nlh;
3466 u32 preferred, valid;
3468 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3472 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3473 ifa->idev->dev->ifindex);
3475 if (!(ifa->flags&IFA_F_PERMANENT)) {
3476 preferred = ifa->prefered_lft;
3477 valid = ifa->valid_lft;
3478 if (preferred != INFINITY_LIFE_TIME) {
3479 long tval = (jiffies - ifa->tstamp)/HZ;
3480 if (preferred > tval)
3484 if (valid != INFINITY_LIFE_TIME) {
3492 preferred = INFINITY_LIFE_TIME;
3493 valid = INFINITY_LIFE_TIME;
3496 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3497 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3498 nlmsg_cancel(skb, nlh);
3502 return nlmsg_end(skb, nlh);
3505 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3506 u32 pid, u32 seq, int event, u16 flags)
3508 struct nlmsghdr *nlh;
3509 u8 scope = RT_SCOPE_UNIVERSE;
3510 int ifindex = ifmca->idev->dev->ifindex;
3512 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3513 scope = RT_SCOPE_SITE;
3515 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3519 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3520 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3521 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3522 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3523 nlmsg_cancel(skb, nlh);
3527 return nlmsg_end(skb, nlh);
3530 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3531 u32 pid, u32 seq, int event, unsigned int flags)
3533 struct nlmsghdr *nlh;
3534 u8 scope = RT_SCOPE_UNIVERSE;
3535 int ifindex = ifaca->aca_idev->dev->ifindex;
3537 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3538 scope = RT_SCOPE_SITE;
3540 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3544 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3545 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3546 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3547 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3548 nlmsg_cancel(skb, nlh);
3552 return nlmsg_end(skb, nlh);
3561 /* called with rcu_read_lock() */
3562 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3563 struct netlink_callback *cb, enum addr_type_t type,
3564 int s_ip_idx, int *p_ip_idx)
3566 struct ifmcaddr6 *ifmca;
3567 struct ifacaddr6 *ifaca;
3569 int ip_idx = *p_ip_idx;
3571 read_lock_bh(&idev->lock);
3573 case UNICAST_ADDR: {
3574 struct inet6_ifaddr *ifa;
3576 /* unicast address incl. temp addr */
3577 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3578 if (++ip_idx < s_ip_idx)
3580 err = inet6_fill_ifaddr(skb, ifa,
3581 NETLINK_CB(cb->skb).pid,
3590 case MULTICAST_ADDR:
3591 /* multicast address */
3592 for (ifmca = idev->mc_list; ifmca;
3593 ifmca = ifmca->next, ip_idx++) {
3594 if (ip_idx < s_ip_idx)
3596 err = inet6_fill_ifmcaddr(skb, ifmca,
3597 NETLINK_CB(cb->skb).pid,
3606 /* anycast address */
3607 for (ifaca = idev->ac_list; ifaca;
3608 ifaca = ifaca->aca_next, ip_idx++) {
3609 if (ip_idx < s_ip_idx)
3611 err = inet6_fill_ifacaddr(skb, ifaca,
3612 NETLINK_CB(cb->skb).pid,
3623 read_unlock_bh(&idev->lock);
3628 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3629 enum addr_type_t type)
3631 struct net *net = sock_net(skb->sk);
3634 int s_idx, s_ip_idx;
3635 struct net_device *dev;
3636 struct inet6_dev *idev;
3637 struct hlist_head *head;
3638 struct hlist_node *node;
3641 s_idx = idx = cb->args[1];
3642 s_ip_idx = ip_idx = cb->args[2];
3645 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3647 head = &net->dev_index_head[h];
3648 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3651 if (h > s_h || idx > s_idx)
3654 idev = __in6_dev_get(dev);
3658 if (in6_dump_addrs(idev, skb, cb, type,
3659 s_ip_idx, &ip_idx) <= 0)
3669 cb->args[2] = ip_idx;
3674 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3676 enum addr_type_t type = UNICAST_ADDR;
3678 return inet6_dump_addr(skb, cb, type);
3681 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3683 enum addr_type_t type = MULTICAST_ADDR;
3685 return inet6_dump_addr(skb, cb, type);
3689 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3691 enum addr_type_t type = ANYCAST_ADDR;
3693 return inet6_dump_addr(skb, cb, type);
3696 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3699 struct net *net = sock_net(in_skb->sk);
3700 struct ifaddrmsg *ifm;
3701 struct nlattr *tb[IFA_MAX+1];
3702 struct in6_addr *addr = NULL;
3703 struct net_device *dev = NULL;
3704 struct inet6_ifaddr *ifa;
3705 struct sk_buff *skb;
3708 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3712 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3718 ifm = nlmsg_data(nlh);
3720 dev = __dev_get_by_index(net, ifm->ifa_index);
3722 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
3724 err = -EADDRNOTAVAIL;
3728 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
3734 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3735 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3737 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3738 WARN_ON(err == -EMSGSIZE);
3742 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
3749 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3751 struct sk_buff *skb;
3752 struct net *net = dev_net(ifa->idev->dev);
3755 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3759 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3761 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3762 WARN_ON(err == -EMSGSIZE);
3766 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3770 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3773 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3774 __s32 *array, int bytes)
3776 BUG_ON(bytes < (DEVCONF_MAX * 4));
3778 memset(array, 0, bytes);
3779 array[DEVCONF_FORWARDING] = cnf->forwarding;
3780 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3781 array[DEVCONF_MTU6] = cnf->mtu6;
3782 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3783 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3784 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3785 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3786 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3787 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
3788 jiffies_to_msecs(cnf->rtr_solicit_interval);
3789 array[DEVCONF_RTR_SOLICIT_DELAY] =
3790 jiffies_to_msecs(cnf->rtr_solicit_delay);
3791 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3792 #ifdef CONFIG_IPV6_PRIVACY
3793 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3794 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3795 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3796 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3797 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3799 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3800 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3801 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3802 #ifdef CONFIG_IPV6_ROUTER_PREF
3803 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3804 array[DEVCONF_RTR_PROBE_INTERVAL] =
3805 jiffies_to_msecs(cnf->rtr_probe_interval);
3806 #ifdef CONFIG_IPV6_ROUTE_INFO
3807 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3810 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3811 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3812 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3813 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3815 #ifdef CONFIG_IPV6_MROUTE
3816 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3818 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
3819 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
3820 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
3823 static inline size_t inet6_ifla6_size(void)
3825 return nla_total_size(4) /* IFLA_INET6_FLAGS */
3826 + nla_total_size(sizeof(struct ifla_cacheinfo))
3827 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3828 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3829 + nla_total_size(ICMP6_MIB_MAX * 8); /* IFLA_INET6_ICMP6STATS */
3832 static inline size_t inet6_if_nlmsg_size(void)
3834 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3835 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3836 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3837 + nla_total_size(4) /* IFLA_MTU */
3838 + nla_total_size(4) /* IFLA_LINK */
3839 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
3842 static inline void __snmp6_fill_stats(u64 *stats, void __percpu **mib,
3843 int items, int bytes)
3846 int pad = bytes - sizeof(u64) * items;
3849 /* Use put_unaligned() because stats may not be aligned for u64. */
3850 put_unaligned(items, &stats[0]);
3851 for (i = 1; i < items; i++)
3852 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3854 memset(&stats[items], 0, pad);
3857 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
3858 int items, int bytes, size_t syncpoff)
3861 int pad = bytes - sizeof(u64) * items;
3864 /* Use put_unaligned() because stats may not be aligned for u64. */
3865 put_unaligned(items, &stats[0]);
3866 for (i = 1; i < items; i++)
3867 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
3869 memset(&stats[items], 0, pad);
3872 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3876 case IFLA_INET6_STATS:
3877 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
3878 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
3880 case IFLA_INET6_ICMP6STATS:
3881 __snmp6_fill_stats(stats, (void __percpu **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3886 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
3889 struct ifla_cacheinfo ci;
3891 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3893 ci.max_reasm_len = IPV6_MAXPLEN;
3894 ci.tstamp = cstamp_delta(idev->tstamp);
3895 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
3896 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
3897 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3899 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3901 goto nla_put_failure;
3902 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3904 /* XXX - MC not implemented */
3906 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3908 goto nla_put_failure;
3909 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3911 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3913 goto nla_put_failure;
3914 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3922 static size_t inet6_get_link_af_size(const struct net_device *dev)
3924 if (!__in6_dev_get(dev))
3927 return inet6_ifla6_size();
3930 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
3932 struct inet6_dev *idev = __in6_dev_get(dev);
3937 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
3943 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3944 u32 pid, u32 seq, int event, unsigned int flags)
3946 struct net_device *dev = idev->dev;
3947 struct ifinfomsg *hdr;
3948 struct nlmsghdr *nlh;
3951 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3955 hdr = nlmsg_data(nlh);
3956 hdr->ifi_family = AF_INET6;
3958 hdr->ifi_type = dev->type;
3959 hdr->ifi_index = dev->ifindex;
3960 hdr->ifi_flags = dev_get_flags(dev);
3961 hdr->ifi_change = 0;
3963 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3966 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3968 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3969 if (dev->ifindex != dev->iflink)
3970 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3972 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3973 if (protoinfo == NULL)
3974 goto nla_put_failure;
3976 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
3977 goto nla_put_failure;
3979 nla_nest_end(skb, protoinfo);
3980 return nlmsg_end(skb, nlh);
3983 nlmsg_cancel(skb, nlh);
3987 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3989 struct net *net = sock_net(skb->sk);
3992 struct net_device *dev;
3993 struct inet6_dev *idev;
3994 struct hlist_head *head;
3995 struct hlist_node *node;
3998 s_idx = cb->args[1];
4001 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4003 head = &net->dev_index_head[h];
4004 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
4007 idev = __in6_dev_get(dev);
4010 if (inet6_fill_ifinfo(skb, idev,
4011 NETLINK_CB(cb->skb).pid,
4013 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4027 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4029 struct sk_buff *skb;
4030 struct net *net = dev_net(idev->dev);
4033 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4037 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4039 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4040 WARN_ON(err == -EMSGSIZE);
4044 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4048 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4051 static inline size_t inet6_prefix_nlmsg_size(void)
4053 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4054 + nla_total_size(sizeof(struct in6_addr))
4055 + nla_total_size(sizeof(struct prefix_cacheinfo));
4058 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4059 struct prefix_info *pinfo, u32 pid, u32 seq,
4060 int event, unsigned int flags)
4062 struct prefixmsg *pmsg;
4063 struct nlmsghdr *nlh;
4064 struct prefix_cacheinfo ci;
4066 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
4070 pmsg = nlmsg_data(nlh);
4071 pmsg->prefix_family = AF_INET6;
4072 pmsg->prefix_pad1 = 0;
4073 pmsg->prefix_pad2 = 0;
4074 pmsg->prefix_ifindex = idev->dev->ifindex;
4075 pmsg->prefix_len = pinfo->prefix_len;
4076 pmsg->prefix_type = pinfo->type;
4077 pmsg->prefix_pad3 = 0;
4078 pmsg->prefix_flags = 0;
4080 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4081 if (pinfo->autoconf)
4082 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4084 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
4086 ci.preferred_time = ntohl(pinfo->prefered);
4087 ci.valid_time = ntohl(pinfo->valid);
4088 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
4090 return nlmsg_end(skb, nlh);
4093 nlmsg_cancel(skb, nlh);
4097 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4098 struct prefix_info *pinfo)
4100 struct sk_buff *skb;
4101 struct net *net = dev_net(idev->dev);
4104 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4108 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4110 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4111 WARN_ON(err == -EMSGSIZE);
4115 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4119 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4122 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4124 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4129 * If the address was optimistic
4130 * we inserted the route at the start of
4131 * our DAD process, so we don't need
4134 if (!(ifp->rt->rt6i_node))
4135 ip6_ins_rt(ifp->rt);
4136 if (ifp->idev->cnf.forwarding)
4137 addrconf_join_anycast(ifp);
4140 if (ifp->idev->cnf.forwarding)
4141 addrconf_leave_anycast(ifp);
4142 addrconf_leave_solict(ifp->idev, &ifp->addr);
4143 dst_hold(&ifp->rt->dst);
4145 if (ip6_del_rt(ifp->rt))
4146 dst_free(&ifp->rt->dst);
4151 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4154 if (likely(ifp->idev->dead == 0))
4155 __ipv6_ifa_notify(event, ifp);
4156 rcu_read_unlock_bh();
4159 #ifdef CONFIG_SYSCTL
4162 int addrconf_sysctl_forward(ctl_table *ctl, int write,
4163 void __user *buffer, size_t *lenp, loff_t *ppos)
4165 int *valp = ctl->data;
4170 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4173 ret = addrconf_fixup_forwarding(ctl, valp, val);
4179 static void dev_disable_change(struct inet6_dev *idev)
4181 if (!idev || !idev->dev)
4184 if (idev->cnf.disable_ipv6)
4185 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4187 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4190 static void addrconf_disable_change(struct net *net, __s32 newf)
4192 struct net_device *dev;
4193 struct inet6_dev *idev;
4196 for_each_netdev_rcu(net, dev) {
4197 idev = __in6_dev_get(dev);
4199 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4200 idev->cnf.disable_ipv6 = newf;
4202 dev_disable_change(idev);
4208 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int old)
4212 net = (struct net *)table->extra2;
4214 if (p == &net->ipv6.devconf_dflt->disable_ipv6)
4217 if (!rtnl_trylock()) {
4218 /* Restore the original values before restarting */
4220 return restart_syscall();
4223 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4224 __s32 newf = net->ipv6.devconf_all->disable_ipv6;
4225 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4226 addrconf_disable_change(net, newf);
4227 } else if ((!*p) ^ (!old))
4228 dev_disable_change((struct inet6_dev *)table->extra1);
4235 int addrconf_sysctl_disable(ctl_table *ctl, int write,
4236 void __user *buffer, size_t *lenp, loff_t *ppos)
4238 int *valp = ctl->data;
4243 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4246 ret = addrconf_disable_ipv6(ctl, valp, val);
4252 static struct addrconf_sysctl_table
4254 struct ctl_table_header *sysctl_header;
4255 ctl_table addrconf_vars[DEVCONF_MAX+1];
4257 } addrconf_sysctl __read_mostly = {
4258 .sysctl_header = NULL,
4261 .procname = "forwarding",
4262 .data = &ipv6_devconf.forwarding,
4263 .maxlen = sizeof(int),
4265 .proc_handler = addrconf_sysctl_forward,
4268 .procname = "hop_limit",
4269 .data = &ipv6_devconf.hop_limit,
4270 .maxlen = sizeof(int),
4272 .proc_handler = proc_dointvec,
4276 .data = &ipv6_devconf.mtu6,
4277 .maxlen = sizeof(int),
4279 .proc_handler = proc_dointvec,
4282 .procname = "accept_ra",
4283 .data = &ipv6_devconf.accept_ra,
4284 .maxlen = sizeof(int),
4286 .proc_handler = proc_dointvec,
4289 .procname = "accept_redirects",
4290 .data = &ipv6_devconf.accept_redirects,
4291 .maxlen = sizeof(int),
4293 .proc_handler = proc_dointvec,
4296 .procname = "autoconf",
4297 .data = &ipv6_devconf.autoconf,
4298 .maxlen = sizeof(int),
4300 .proc_handler = proc_dointvec,
4303 .procname = "dad_transmits",
4304 .data = &ipv6_devconf.dad_transmits,
4305 .maxlen = sizeof(int),
4307 .proc_handler = proc_dointvec,
4310 .procname = "router_solicitations",
4311 .data = &ipv6_devconf.rtr_solicits,
4312 .maxlen = sizeof(int),
4314 .proc_handler = proc_dointvec,
4317 .procname = "router_solicitation_interval",
4318 .data = &ipv6_devconf.rtr_solicit_interval,
4319 .maxlen = sizeof(int),
4321 .proc_handler = proc_dointvec_jiffies,
4324 .procname = "router_solicitation_delay",
4325 .data = &ipv6_devconf.rtr_solicit_delay,
4326 .maxlen = sizeof(int),
4328 .proc_handler = proc_dointvec_jiffies,
4331 .procname = "force_mld_version",
4332 .data = &ipv6_devconf.force_mld_version,
4333 .maxlen = sizeof(int),
4335 .proc_handler = proc_dointvec,
4337 #ifdef CONFIG_IPV6_PRIVACY
4339 .procname = "use_tempaddr",
4340 .data = &ipv6_devconf.use_tempaddr,
4341 .maxlen = sizeof(int),
4343 .proc_handler = proc_dointvec,
4346 .procname = "temp_valid_lft",
4347 .data = &ipv6_devconf.temp_valid_lft,
4348 .maxlen = sizeof(int),
4350 .proc_handler = proc_dointvec,
4353 .procname = "temp_prefered_lft",
4354 .data = &ipv6_devconf.temp_prefered_lft,
4355 .maxlen = sizeof(int),
4357 .proc_handler = proc_dointvec,
4360 .procname = "regen_max_retry",
4361 .data = &ipv6_devconf.regen_max_retry,
4362 .maxlen = sizeof(int),
4364 .proc_handler = proc_dointvec,
4367 .procname = "max_desync_factor",
4368 .data = &ipv6_devconf.max_desync_factor,
4369 .maxlen = sizeof(int),
4371 .proc_handler = proc_dointvec,
4375 .procname = "max_addresses",
4376 .data = &ipv6_devconf.max_addresses,
4377 .maxlen = sizeof(int),
4379 .proc_handler = proc_dointvec,
4382 .procname = "accept_ra_defrtr",
4383 .data = &ipv6_devconf.accept_ra_defrtr,
4384 .maxlen = sizeof(int),
4386 .proc_handler = proc_dointvec,
4389 .procname = "accept_ra_pinfo",
4390 .data = &ipv6_devconf.accept_ra_pinfo,
4391 .maxlen = sizeof(int),
4393 .proc_handler = proc_dointvec,
4395 #ifdef CONFIG_IPV6_ROUTER_PREF
4397 .procname = "accept_ra_rtr_pref",
4398 .data = &ipv6_devconf.accept_ra_rtr_pref,
4399 .maxlen = sizeof(int),
4401 .proc_handler = proc_dointvec,
4404 .procname = "router_probe_interval",
4405 .data = &ipv6_devconf.rtr_probe_interval,
4406 .maxlen = sizeof(int),
4408 .proc_handler = proc_dointvec_jiffies,
4410 #ifdef CONFIG_IPV6_ROUTE_INFO
4412 .procname = "accept_ra_rt_info_max_plen",
4413 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4414 .maxlen = sizeof(int),
4416 .proc_handler = proc_dointvec,
4421 .procname = "proxy_ndp",
4422 .data = &ipv6_devconf.proxy_ndp,
4423 .maxlen = sizeof(int),
4425 .proc_handler = proc_dointvec,
4428 .procname = "accept_source_route",
4429 .data = &ipv6_devconf.accept_source_route,
4430 .maxlen = sizeof(int),
4432 .proc_handler = proc_dointvec,
4434 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4436 .procname = "optimistic_dad",
4437 .data = &ipv6_devconf.optimistic_dad,
4438 .maxlen = sizeof(int),
4440 .proc_handler = proc_dointvec,
4444 #ifdef CONFIG_IPV6_MROUTE
4446 .procname = "mc_forwarding",
4447 .data = &ipv6_devconf.mc_forwarding,
4448 .maxlen = sizeof(int),
4450 .proc_handler = proc_dointvec,
4454 .procname = "disable_ipv6",
4455 .data = &ipv6_devconf.disable_ipv6,
4456 .maxlen = sizeof(int),
4458 .proc_handler = addrconf_sysctl_disable,
4461 .procname = "accept_dad",
4462 .data = &ipv6_devconf.accept_dad,
4463 .maxlen = sizeof(int),
4465 .proc_handler = proc_dointvec,
4468 .procname = "force_tllao",
4469 .data = &ipv6_devconf.force_tllao,
4470 .maxlen = sizeof(int),
4472 .proc_handler = proc_dointvec
4480 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4481 struct inet6_dev *idev, struct ipv6_devconf *p)
4484 struct addrconf_sysctl_table *t;
4486 #define ADDRCONF_CTL_PATH_DEV 3
4488 struct ctl_path addrconf_ctl_path[] = {
4489 { .procname = "net", },
4490 { .procname = "ipv6", },
4491 { .procname = "conf", },
4492 { /* to be set */ },
4497 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4501 for (i = 0; t->addrconf_vars[i].data; i++) {
4502 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
4503 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4504 t->addrconf_vars[i].extra2 = net;
4508 * Make a copy of dev_name, because '.procname' is regarded as const
4509 * by sysctl and we wouldn't want anyone to change it under our feet
4510 * (see SIOCSIFNAME).
4512 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4516 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4518 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4520 if (t->sysctl_header == NULL)
4534 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4536 struct addrconf_sysctl_table *t;
4538 if (p->sysctl == NULL)
4543 unregister_sysctl_table(t->sysctl_header);
4548 static void addrconf_sysctl_register(struct inet6_dev *idev)
4550 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
4551 &ndisc_ifinfo_sysctl_change);
4552 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4556 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4558 __addrconf_sysctl_unregister(&idev->cnf);
4559 neigh_sysctl_unregister(idev->nd_parms);
4565 static int __net_init addrconf_init_net(struct net *net)
4568 struct ipv6_devconf *all, *dflt;
4571 all = &ipv6_devconf;
4572 dflt = &ipv6_devconf_dflt;
4574 if (!net_eq(net, &init_net)) {
4575 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4579 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4581 goto err_alloc_dflt;
4583 /* these will be inherited by all namespaces */
4584 dflt->autoconf = ipv6_defaults.autoconf;
4585 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
4588 net->ipv6.devconf_all = all;
4589 net->ipv6.devconf_dflt = dflt;
4591 #ifdef CONFIG_SYSCTL
4592 err = __addrconf_sysctl_register(net, "all", NULL, all);
4596 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
4602 #ifdef CONFIG_SYSCTL
4604 __addrconf_sysctl_unregister(all);
4614 static void __net_exit addrconf_exit_net(struct net *net)
4616 #ifdef CONFIG_SYSCTL
4617 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4618 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4620 if (!net_eq(net, &init_net)) {
4621 kfree(net->ipv6.devconf_dflt);
4622 kfree(net->ipv6.devconf_all);
4626 static struct pernet_operations addrconf_ops = {
4627 .init = addrconf_init_net,
4628 .exit = addrconf_exit_net,
4635 int register_inet6addr_notifier(struct notifier_block *nb)
4637 return atomic_notifier_chain_register(&inet6addr_chain, nb);
4639 EXPORT_SYMBOL(register_inet6addr_notifier);
4641 int unregister_inet6addr_notifier(struct notifier_block *nb)
4643 return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
4645 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4647 static struct rtnl_af_ops inet6_ops = {
4649 .fill_link_af = inet6_fill_link_af,
4650 .get_link_af_size = inet6_get_link_af_size,
4654 * Init / cleanup code
4657 int __init addrconf_init(void)
4661 err = ipv6_addr_label_init();
4663 printk(KERN_CRIT "IPv6 Addrconf:"
4664 " cannot initialize default policy table: %d.\n", err);
4668 err = register_pernet_subsys(&addrconf_ops);
4672 /* The addrconf netdev notifier requires that loopback_dev
4673 * has it's ipv6 private information allocated and setup
4674 * before it can bring up and give link-local addresses
4675 * to other devices which are up.
4677 * Unfortunately, loopback_dev is not necessarily the first
4678 * entry in the global dev_base list of net devices. In fact,
4679 * it is likely to be the very last entry on that list.
4680 * So this causes the notifier registry below to try and
4681 * give link-local addresses to all devices besides loopback_dev
4682 * first, then loopback_dev, which cases all the non-loopback_dev
4683 * devices to fail to get a link-local address.
4685 * So, as a temporary fix, allocate the ipv6 structure for
4686 * loopback_dev first by hand.
4687 * Longer term, all of the dependencies ipv6 has upon the loopback
4688 * device and it being up should be removed.
4691 if (!ipv6_add_dev(init_net.loopback_dev))
4697 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4698 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
4700 register_netdevice_notifier(&ipv6_dev_notf);
4704 err = rtnl_af_register(&inet6_ops);
4708 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4712 /* Only the first call to __rtnl_register can fail */
4713 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4714 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4715 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4716 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4717 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4719 ipv6_addr_label_rtnl_register();
4723 rtnl_af_unregister(&inet6_ops);
4725 unregister_netdevice_notifier(&ipv6_dev_notf);
4727 unregister_pernet_subsys(&addrconf_ops);
4729 ipv6_addr_label_cleanup();
4734 void addrconf_cleanup(void)
4736 struct net_device *dev;
4739 unregister_netdevice_notifier(&ipv6_dev_notf);
4740 unregister_pernet_subsys(&addrconf_ops);
4741 ipv6_addr_label_cleanup();
4745 __rtnl_af_unregister(&inet6_ops);
4747 /* clean dev list */
4748 for_each_netdev(&init_net, dev) {
4749 if (__in6_dev_get(dev) == NULL)
4751 addrconf_ifdown(dev, 1);
4753 addrconf_ifdown(init_net.loopback_dev, 2);
4758 spin_lock_bh(&addrconf_hash_lock);
4759 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4760 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
4761 spin_unlock_bh(&addrconf_hash_lock);
4763 del_timer(&addr_chk_timer);