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>
57 #include <linux/sysctl.h>
59 #include <linux/capability.h>
60 #include <linux/delay.h>
61 #include <linux/notifier.h>
62 #include <linux/string.h>
64 #include <net/net_namespace.h>
69 #include <net/protocol.h>
70 #include <net/ndisc.h>
71 #include <net/ip6_route.h>
72 #include <net/addrconf.h>
75 #include <net/netlink.h>
76 #include <net/pkt_sched.h>
77 #include <linux/if_tunnel.h>
78 #include <linux/rtnetlink.h>
80 #ifdef CONFIG_IPV6_PRIVACY
81 #include <linux/random.h>
84 #include <linux/uaccess.h>
85 #include <asm/unaligned.h>
87 #include <linux/proc_fs.h>
88 #include <linux/seq_file.h>
90 /* Set to 3 to get tracing... */
94 #define ADBG(x) printk x
99 #define INFINITY_LIFE_TIME 0xFFFFFFFF
100 #define TIME_DELTA(a, b) ((unsigned long)((long)(a) - (long)(b)))
102 #define ADDRCONF_TIMER_FUZZ_MINUS (HZ > 50 ? HZ/50 : 1)
103 #define ADDRCONF_TIMER_FUZZ (HZ / 4)
104 #define ADDRCONF_TIMER_FUZZ_MAX (HZ)
107 static void addrconf_sysctl_register(struct inet6_dev *idev);
108 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
110 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
114 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
119 #ifdef CONFIG_IPV6_PRIVACY
120 static int __ipv6_regen_rndid(struct inet6_dev *idev);
121 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
122 static void ipv6_regen_rndid(unsigned long data);
124 static int desync_factor = MAX_DESYNC_FACTOR * HZ;
127 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
128 static int ipv6_count_addresses(struct inet6_dev *idev);
131 * Configured unicast address hash table
133 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
134 static DEFINE_SPINLOCK(addrconf_hash_lock);
136 static void addrconf_verify(unsigned long);
138 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
139 static DEFINE_SPINLOCK(addrconf_verify_lock);
141 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
142 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
144 static void addrconf_type_change(struct net_device *dev,
145 unsigned long event);
146 static int addrconf_ifdown(struct net_device *dev, int how);
148 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
149 static void addrconf_dad_timer(unsigned long data);
150 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
151 static void addrconf_dad_run(struct inet6_dev *idev);
152 static void addrconf_rs_timer(unsigned long data);
153 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
154 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
156 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
157 struct prefix_info *pinfo);
158 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
159 struct net_device *dev);
161 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
163 static struct ipv6_devconf ipv6_devconf __read_mostly = {
165 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
166 .mtu6 = IPV6_MIN_MTU,
168 .accept_redirects = 1,
170 .force_mld_version = 0,
172 .rtr_solicits = MAX_RTR_SOLICITATIONS,
173 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
174 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
175 #ifdef CONFIG_IPV6_PRIVACY
177 .temp_valid_lft = TEMP_VALID_LIFETIME,
178 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
179 .regen_max_retry = REGEN_MAX_RETRY,
180 .max_desync_factor = MAX_DESYNC_FACTOR,
182 .max_addresses = IPV6_MAX_ADDRESSES,
183 .accept_ra_defrtr = 1,
184 .accept_ra_pinfo = 1,
185 #ifdef CONFIG_IPV6_ROUTER_PREF
186 .accept_ra_rtr_pref = 1,
187 .rtr_probe_interval = 60 * HZ,
188 #ifdef CONFIG_IPV6_ROUTE_INFO
189 .accept_ra_rt_info_max_plen = 0,
193 .accept_source_route = 0, /* we do not accept RH0 by default. */
198 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
200 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
201 .mtu6 = IPV6_MIN_MTU,
203 .accept_redirects = 1,
206 .rtr_solicits = MAX_RTR_SOLICITATIONS,
207 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
208 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
209 #ifdef CONFIG_IPV6_PRIVACY
211 .temp_valid_lft = TEMP_VALID_LIFETIME,
212 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
213 .regen_max_retry = REGEN_MAX_RETRY,
214 .max_desync_factor = MAX_DESYNC_FACTOR,
216 .max_addresses = IPV6_MAX_ADDRESSES,
217 .accept_ra_defrtr = 1,
218 .accept_ra_pinfo = 1,
219 #ifdef CONFIG_IPV6_ROUTER_PREF
220 .accept_ra_rtr_pref = 1,
221 .rtr_probe_interval = 60 * HZ,
222 #ifdef CONFIG_IPV6_ROUTE_INFO
223 .accept_ra_rt_info_max_plen = 0,
227 .accept_source_route = 0, /* we do not accept RH0 by default. */
232 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
233 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
234 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
235 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
236 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
238 /* Check if a valid qdisc is available */
239 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
241 return !qdisc_tx_is_noop(dev);
244 /* Check if a route is valid prefix route */
245 static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
247 return ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0);
250 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
252 if (del_timer(&ifp->timer))
256 enum addrconf_timer_t {
262 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
263 enum addrconf_timer_t what,
266 if (!del_timer(&ifp->timer))
271 ifp->timer.function = addrconf_dad_timer;
274 ifp->timer.function = addrconf_rs_timer;
279 ifp->timer.expires = jiffies + when;
280 add_timer(&ifp->timer);
283 static int snmp6_alloc_dev(struct inet6_dev *idev)
285 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
286 sizeof(struct ipstats_mib)) < 0)
288 if (snmp_mib_init((void __percpu **)idev->stats.icmpv6,
289 sizeof(struct icmpv6_mib)) < 0)
291 if (snmp_mib_init((void __percpu **)idev->stats.icmpv6msg,
292 sizeof(struct icmpv6msg_mib)) < 0)
298 snmp_mib_free((void __percpu **)idev->stats.icmpv6);
300 snmp_mib_free((void __percpu **)idev->stats.ipv6);
305 static void snmp6_free_dev(struct inet6_dev *idev)
307 snmp_mib_free((void __percpu **)idev->stats.icmpv6msg);
308 snmp_mib_free((void __percpu **)idev->stats.icmpv6);
309 snmp_mib_free((void __percpu **)idev->stats.ipv6);
312 /* Nobody refers to this device, we may destroy it. */
314 static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
316 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
320 void in6_dev_finish_destroy(struct inet6_dev *idev)
322 struct net_device *dev = idev->dev;
324 WARN_ON(!list_empty(&idev->addr_list));
325 WARN_ON(idev->mc_list != NULL);
327 #ifdef NET_REFCNT_DEBUG
328 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
332 pr_warning("Freeing alive inet6 device %p\n", idev);
335 snmp6_free_dev(idev);
336 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
339 EXPORT_SYMBOL(in6_dev_finish_destroy);
341 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
343 struct inet6_dev *ndev;
347 if (dev->mtu < IPV6_MIN_MTU)
350 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
355 rwlock_init(&ndev->lock);
357 INIT_LIST_HEAD(&ndev->addr_list);
359 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
360 ndev->cnf.mtu6 = dev->mtu;
361 ndev->cnf.sysctl = NULL;
362 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
363 if (ndev->nd_parms == NULL) {
367 if (ndev->cnf.forwarding)
368 dev_disable_lro(dev);
369 /* We refer to the device */
372 if (snmp6_alloc_dev(ndev) < 0) {
374 "%s(): cannot allocate memory for statistics; dev=%s.\n",
375 __func__, dev->name));
376 neigh_parms_release(&nd_tbl, ndev->nd_parms);
378 in6_dev_finish_destroy(ndev);
382 if (snmp6_register_dev(ndev) < 0) {
384 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
385 __func__, dev->name));
386 neigh_parms_release(&nd_tbl, ndev->nd_parms);
388 in6_dev_finish_destroy(ndev);
392 /* One reference from device. We must do this before
393 * we invoke __ipv6_regen_rndid().
397 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
398 ndev->cnf.accept_dad = -1;
400 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
401 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
403 "%s: Disabled Multicast RS\n",
405 ndev->cnf.rtr_solicits = 0;
409 #ifdef CONFIG_IPV6_PRIVACY
410 INIT_LIST_HEAD(&ndev->tempaddr_list);
411 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
412 if ((dev->flags&IFF_LOOPBACK) ||
413 dev->type == ARPHRD_TUNNEL ||
414 dev->type == ARPHRD_TUNNEL6 ||
415 dev->type == ARPHRD_SIT ||
416 dev->type == ARPHRD_NONE) {
418 "%s: Disabled Privacy Extensions\n",
420 ndev->cnf.use_tempaddr = -1;
423 ipv6_regen_rndid((unsigned long) ndev);
427 if (netif_running(dev) && addrconf_qdisc_ok(dev))
428 ndev->if_flags |= IF_READY;
430 ipv6_mc_init_dev(ndev);
431 ndev->tstamp = jiffies;
432 addrconf_sysctl_register(ndev);
433 /* protected by rtnl_lock */
434 rcu_assign_pointer(dev->ip6_ptr, ndev);
436 /* Join all-node multicast group */
437 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
442 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
444 struct inet6_dev *idev;
448 idev = __in6_dev_get(dev);
450 idev = ipv6_add_dev(dev);
455 if (dev->flags&IFF_UP)
461 static void dev_forward_change(struct inet6_dev *idev)
463 struct net_device *dev;
464 struct inet6_ifaddr *ifa;
469 if (idev->cnf.forwarding)
470 dev_disable_lro(dev);
471 if (dev && (dev->flags & IFF_MULTICAST)) {
472 if (idev->cnf.forwarding)
473 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
475 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
478 list_for_each_entry(ifa, &idev->addr_list, if_list) {
479 if (ifa->flags&IFA_F_TENTATIVE)
481 if (idev->cnf.forwarding)
482 addrconf_join_anycast(ifa);
484 addrconf_leave_anycast(ifa);
489 static void addrconf_forward_change(struct net *net, __s32 newf)
491 struct net_device *dev;
492 struct inet6_dev *idev;
495 for_each_netdev_rcu(net, dev) {
496 idev = __in6_dev_get(dev);
498 int changed = (!idev->cnf.forwarding) ^ (!newf);
499 idev->cnf.forwarding = newf;
501 dev_forward_change(idev);
507 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
511 net = (struct net *)table->extra2;
512 if (p == &net->ipv6.devconf_dflt->forwarding)
515 if (!rtnl_trylock()) {
516 /* Restore the original values before restarting */
518 return restart_syscall();
521 if (p == &net->ipv6.devconf_all->forwarding) {
522 __s32 newf = net->ipv6.devconf_all->forwarding;
523 net->ipv6.devconf_dflt->forwarding = newf;
524 addrconf_forward_change(net, newf);
525 } else if ((!*p) ^ (!old))
526 dev_forward_change((struct inet6_dev *)table->extra1);
530 rt6_purge_dflt_routers(net);
535 static void inet6_ifa_finish_destroy_rcu(struct rcu_head *head)
537 struct inet6_ifaddr *ifp = container_of(head, struct inet6_ifaddr, rcu);
541 /* Nobody refers to this ifaddr, destroy it */
542 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
544 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
546 #ifdef NET_REFCNT_DEBUG
547 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
550 in6_dev_put(ifp->idev);
552 if (del_timer(&ifp->timer))
553 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
556 pr_warning("Freeing alive inet6 address %p\n", ifp);
559 dst_release(&ifp->rt->u.dst);
561 call_rcu(&ifp->rcu, inet6_ifa_finish_destroy_rcu);
565 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
568 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
571 * Each device address list is sorted in order of scope -
572 * global before linklocal.
574 list_for_each(p, &idev->addr_list) {
575 struct inet6_ifaddr *ifa
576 = list_entry(p, struct inet6_ifaddr, if_list);
577 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
581 list_add_tail(&ifp->if_list, p);
584 static u32 ipv6_addr_hash(const struct in6_addr *addr)
587 * We perform the hash function over the last 64 bits of the address
588 * This will include the IEEE address token on links that support it.
590 return jhash_2words(addr->s6_addr32[2], addr->s6_addr32[3], 0)
591 & (IN6_ADDR_HSIZE - 1);
594 /* On success it returns ifp with increased reference count */
596 static struct inet6_ifaddr *
597 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
598 int scope, u32 flags)
600 struct inet6_ifaddr *ifa = NULL;
604 int addr_type = ipv6_addr_type(addr);
606 if (addr_type == IPV6_ADDR_ANY ||
607 addr_type & IPV6_ADDR_MULTICAST ||
608 (!(idev->dev->flags & IFF_LOOPBACK) &&
609 addr_type & IPV6_ADDR_LOOPBACK))
610 return ERR_PTR(-EADDRNOTAVAIL);
614 err = -ENODEV; /*XXX*/
618 if (idev->cnf.disable_ipv6) {
623 spin_lock(&addrconf_hash_lock);
625 /* Ignore adding duplicate addresses on an interface */
626 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
627 ADBG(("ipv6_add_addr: already assigned\n"));
632 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
635 ADBG(("ipv6_add_addr: malloc failed\n"));
640 rt = addrconf_dst_alloc(idev, addr, 0);
646 ipv6_addr_copy(&ifa->addr, addr);
648 spin_lock_init(&ifa->lock);
649 init_timer(&ifa->timer);
650 INIT_HLIST_NODE(&ifa->addr_lst);
651 ifa->timer.data = (unsigned long) ifa;
653 ifa->prefix_len = pfxlen;
654 ifa->flags = flags | IFA_F_TENTATIVE;
655 ifa->cstamp = ifa->tstamp = jiffies;
660 * part one of RFC 4429, section 3.3
661 * We should not configure an address as
662 * optimistic if we do not yet know the link
663 * layer address of our nexhop router
666 if (rt->rt6i_nexthop == NULL)
667 ifa->flags &= ~IFA_F_OPTIMISTIC;
674 /* Add to big hash table */
675 hash = ipv6_addr_hash(addr);
677 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
679 spin_unlock(&addrconf_hash_lock);
681 write_lock(&idev->lock);
682 /* Add to inet6_dev unicast addr list. */
683 ipv6_link_dev_addr(idev, ifa);
685 #ifdef CONFIG_IPV6_PRIVACY
686 if (ifa->flags&IFA_F_TEMPORARY) {
687 list_add(&ifa->tmp_list, &idev->tempaddr_list);
693 write_unlock(&idev->lock);
695 rcu_read_unlock_bh();
697 if (likely(err == 0))
698 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
706 spin_unlock(&addrconf_hash_lock);
710 /* This function wants to get referenced ifp and releases it before return */
712 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
714 struct inet6_ifaddr *ifa, *ifn;
715 struct inet6_dev *idev = ifp->idev;
717 int deleted = 0, onlink = 0;
718 unsigned long expires = jiffies;
720 hash = ipv6_addr_hash(&ifp->addr);
724 spin_lock_bh(&addrconf_hash_lock);
725 hlist_del_init_rcu(&ifp->addr_lst);
727 spin_unlock_bh(&addrconf_hash_lock);
729 write_lock_bh(&idev->lock);
730 #ifdef CONFIG_IPV6_PRIVACY
731 if (ifp->flags&IFA_F_TEMPORARY) {
732 list_del(&ifp->tmp_list);
734 in6_ifa_put(ifp->ifpub);
741 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
743 list_del_init(&ifp->if_list);
746 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
750 } else if (ifp->flags & IFA_F_PERMANENT) {
751 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
753 if (ifa->flags & IFA_F_PERMANENT) {
758 unsigned long lifetime;
763 spin_lock(&ifa->lock);
765 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
767 * Note: Because this address is
768 * not permanent, lifetime <
769 * LONG_MAX / HZ here.
771 if (time_before(expires,
772 ifa->tstamp + lifetime * HZ))
773 expires = ifa->tstamp + lifetime * HZ;
774 spin_unlock(&ifa->lock);
779 write_unlock_bh(&idev->lock);
781 addrconf_del_timer(ifp);
783 ipv6_ifa_notify(RTM_DELADDR, ifp);
785 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
788 * Purge or update corresponding prefix
790 * 1) we don't purge prefix here if address was not permanent.
791 * prefix is managed by its own lifetime.
792 * 2) if there're no addresses, delete prefix.
793 * 3) if there're still other permanent address(es),
794 * corresponding prefix is still permanent.
795 * 4) otherwise, update prefix lifetime to the
796 * longest valid lifetime among the corresponding
797 * addresses on the device.
798 * Note: subsequent RA will update lifetime.
802 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
803 struct in6_addr prefix;
805 struct net *net = dev_net(ifp->idev->dev);
806 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
807 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
809 if (rt && addrconf_is_prefix_route(rt)) {
813 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
814 rt->rt6i_expires = expires;
815 rt->rt6i_flags |= RTF_EXPIRES;
818 dst_release(&rt->u.dst);
824 #ifdef CONFIG_IPV6_PRIVACY
825 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
827 struct inet6_dev *idev = ifp->idev;
828 struct in6_addr addr, *tmpaddr;
829 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
830 unsigned long regen_advance;
836 write_lock(&idev->lock);
838 spin_lock_bh(&ift->lock);
839 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
840 spin_unlock_bh(&ift->lock);
847 if (idev->cnf.use_tempaddr <= 0) {
848 write_unlock(&idev->lock);
850 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
855 spin_lock_bh(&ifp->lock);
856 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
857 idev->cnf.use_tempaddr = -1; /*XXX*/
858 spin_unlock_bh(&ifp->lock);
859 write_unlock(&idev->lock);
861 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
867 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
868 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
869 spin_unlock_bh(&ifp->lock);
870 write_unlock(&idev->lock);
872 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
878 memcpy(&addr.s6_addr[8], idev->rndid, 8);
879 tmp_valid_lft = min_t(__u32,
881 idev->cnf.temp_valid_lft);
882 tmp_prefered_lft = min_t(__u32,
884 idev->cnf.temp_prefered_lft - desync_factor / HZ);
885 tmp_plen = ifp->prefix_len;
886 max_addresses = idev->cnf.max_addresses;
887 tmp_cstamp = ifp->cstamp;
888 tmp_tstamp = ifp->tstamp;
889 spin_unlock_bh(&ifp->lock);
891 regen_advance = idev->cnf.regen_max_retry *
892 idev->cnf.dad_transmits *
893 idev->nd_parms->retrans_time / HZ;
894 write_unlock(&idev->lock);
896 /* A temporary address is created only if this calculated Preferred
897 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
898 * an implementation must not create a temporary address with a zero
899 * Preferred Lifetime.
901 if (tmp_prefered_lft <= regen_advance) {
908 addr_flags = IFA_F_TEMPORARY;
909 /* set in addrconf_prefix_rcv() */
910 if (ifp->flags & IFA_F_OPTIMISTIC)
911 addr_flags |= IFA_F_OPTIMISTIC;
913 ift = !max_addresses ||
914 ipv6_count_addresses(idev) < max_addresses ?
915 ipv6_add_addr(idev, &addr, tmp_plen,
916 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
918 if (!ift || IS_ERR(ift)) {
922 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
924 write_lock(&idev->lock);
928 spin_lock_bh(&ift->lock);
930 ift->valid_lft = tmp_valid_lft;
931 ift->prefered_lft = tmp_prefered_lft;
932 ift->cstamp = tmp_cstamp;
933 ift->tstamp = tmp_tstamp;
934 spin_unlock_bh(&ift->lock);
936 addrconf_dad_start(ift, 0);
945 * Choose an appropriate source address (RFC3484)
948 IPV6_SADDR_RULE_INIT = 0,
949 IPV6_SADDR_RULE_LOCAL,
950 IPV6_SADDR_RULE_SCOPE,
951 IPV6_SADDR_RULE_PREFERRED,
952 #ifdef CONFIG_IPV6_MIP6
956 IPV6_SADDR_RULE_LABEL,
957 #ifdef CONFIG_IPV6_PRIVACY
958 IPV6_SADDR_RULE_PRIVACY,
960 IPV6_SADDR_RULE_ORCHID,
961 IPV6_SADDR_RULE_PREFIX,
965 struct ipv6_saddr_score {
968 struct inet6_ifaddr *ifa;
969 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
974 struct ipv6_saddr_dst {
975 const struct in6_addr *addr;
982 static inline int ipv6_saddr_preferred(int type)
984 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
989 static int ipv6_get_saddr_eval(struct net *net,
990 struct ipv6_saddr_score *score,
991 struct ipv6_saddr_dst *dst,
996 if (i <= score->rule) {
998 case IPV6_SADDR_RULE_SCOPE:
999 ret = score->scopedist;
1001 case IPV6_SADDR_RULE_PREFIX:
1002 ret = score->matchlen;
1005 ret = !!test_bit(i, score->scorebits);
1011 case IPV6_SADDR_RULE_INIT:
1012 /* Rule 0: remember if hiscore is not ready yet */
1015 case IPV6_SADDR_RULE_LOCAL:
1016 /* Rule 1: Prefer same address */
1017 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1019 case IPV6_SADDR_RULE_SCOPE:
1020 /* Rule 2: Prefer appropriate scope
1025 * ---+--+-+---> scope
1027 * | d is scope of the destination.
1029 * | \ <- smaller scope is better if
1030 * B-15 | \ if scope is enough for destinaion.
1031 * | ret = B - scope (-1 <= scope >= d <= 15).
1033 * |/ <- greater is better
1034 * -C / if scope is not enough for destination.
1035 * /| ret = scope - C (-1 <= d < scope <= 15).
1037 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1038 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1039 * Assume B = 0 and we get C > 29.
1041 ret = __ipv6_addr_src_scope(score->addr_type);
1042 if (ret >= dst->scope)
1045 ret -= 128; /* 30 is enough */
1046 score->scopedist = ret;
1048 case IPV6_SADDR_RULE_PREFERRED:
1049 /* Rule 3: Avoid deprecated and optimistic addresses */
1050 ret = ipv6_saddr_preferred(score->addr_type) ||
1051 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1053 #ifdef CONFIG_IPV6_MIP6
1054 case IPV6_SADDR_RULE_HOA:
1056 /* Rule 4: Prefer home address */
1057 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1058 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1062 case IPV6_SADDR_RULE_OIF:
1063 /* Rule 5: Prefer outgoing interface */
1064 ret = (!dst->ifindex ||
1065 dst->ifindex == score->ifa->idev->dev->ifindex);
1067 case IPV6_SADDR_RULE_LABEL:
1068 /* Rule 6: Prefer matching label */
1069 ret = ipv6_addr_label(net,
1070 &score->ifa->addr, score->addr_type,
1071 score->ifa->idev->dev->ifindex) == dst->label;
1073 #ifdef CONFIG_IPV6_PRIVACY
1074 case IPV6_SADDR_RULE_PRIVACY:
1076 /* Rule 7: Prefer public address
1077 * Note: prefer temprary address if use_tempaddr >= 2
1079 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1080 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1081 score->ifa->idev->cnf.use_tempaddr >= 2;
1082 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1086 case IPV6_SADDR_RULE_ORCHID:
1087 /* Rule 8-: Prefer ORCHID vs ORCHID or
1088 * non-ORCHID vs non-ORCHID
1090 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1091 ipv6_addr_orchid(dst->addr));
1093 case IPV6_SADDR_RULE_PREFIX:
1094 /* Rule 8: Use longest matching prefix */
1095 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1103 __set_bit(i, score->scorebits);
1109 int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
1110 const struct in6_addr *daddr, unsigned int prefs,
1111 struct in6_addr *saddr)
1113 struct ipv6_saddr_score scores[2],
1114 *score = &scores[0], *hiscore = &scores[1];
1115 struct ipv6_saddr_dst dst;
1116 struct net_device *dev;
1119 dst_type = __ipv6_addr_type(daddr);
1121 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1122 dst.scope = __ipv6_addr_src_scope(dst_type);
1123 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1127 hiscore->ifa = NULL;
1131 for_each_netdev_rcu(net, dev) {
1132 struct inet6_dev *idev;
1134 /* Candidate Source Address (section 4)
1135 * - multicast and link-local destination address,
1136 * the set of candidate source address MUST only
1137 * include addresses assigned to interfaces
1138 * belonging to the same link as the outgoing
1140 * (- For site-local destination addresses, the
1141 * set of candidate source addresses MUST only
1142 * include addresses assigned to interfaces
1143 * belonging to the same site as the outgoing
1146 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1147 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1148 dst.ifindex && dev->ifindex != dst.ifindex)
1151 idev = __in6_dev_get(dev);
1155 read_lock_bh(&idev->lock);
1156 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1160 * - Tentative Address (RFC2462 section 5.4)
1161 * - A tentative address is not considered
1162 * "assigned to an interface" in the traditional
1163 * sense, unless it is also flagged as optimistic.
1164 * - Candidate Source Address (section 4)
1165 * - In any case, anycast addresses, multicast
1166 * addresses, and the unspecified address MUST
1167 * NOT be included in a candidate set.
1169 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1170 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1173 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1175 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1176 score->addr_type & IPV6_ADDR_MULTICAST)) {
1177 LIMIT_NETDEBUG(KERN_DEBUG
1178 "ADDRCONF: unspecified / multicast address "
1179 "assigned as unicast address on %s",
1185 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1187 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1188 int minihiscore, miniscore;
1190 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1191 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1193 if (minihiscore > miniscore) {
1194 if (i == IPV6_SADDR_RULE_SCOPE &&
1195 score->scopedist > 0) {
1198 * each remaining entry
1199 * has too small (not enough)
1200 * scope, because ifa entries
1201 * are sorted by their scope
1207 } else if (minihiscore < miniscore) {
1209 in6_ifa_put(hiscore->ifa);
1211 in6_ifa_hold(score->ifa);
1213 swap(hiscore, score);
1215 /* restore our iterator */
1216 score->ifa = hiscore->ifa;
1223 read_unlock_bh(&idev->lock);
1228 return -EADDRNOTAVAIL;
1230 ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1231 in6_ifa_put(hiscore->ifa);
1234 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1236 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1237 unsigned char banned_flags)
1239 struct inet6_dev *idev;
1240 int err = -EADDRNOTAVAIL;
1243 idev = __in6_dev_get(dev);
1245 struct inet6_ifaddr *ifp;
1247 read_lock_bh(&idev->lock);
1248 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1249 if (ifp->scope == IFA_LINK &&
1250 !(ifp->flags & banned_flags)) {
1251 ipv6_addr_copy(addr, &ifp->addr);
1256 read_unlock_bh(&idev->lock);
1262 static int ipv6_count_addresses(struct inet6_dev *idev)
1265 struct inet6_ifaddr *ifp;
1267 read_lock_bh(&idev->lock);
1268 list_for_each_entry(ifp, &idev->addr_list, if_list)
1270 read_unlock_bh(&idev->lock);
1274 int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1275 struct net_device *dev, int strict)
1277 struct inet6_ifaddr *ifp = NULL;
1278 struct hlist_node *node;
1279 unsigned int hash = ipv6_addr_hash(addr);
1282 hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1283 if (!net_eq(dev_net(ifp->idev->dev), net))
1285 if (ipv6_addr_equal(&ifp->addr, addr) &&
1286 !(ifp->flags&IFA_F_TENTATIVE)) {
1287 if (dev == NULL || ifp->idev->dev == dev ||
1288 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1292 rcu_read_unlock_bh();
1296 EXPORT_SYMBOL(ipv6_chk_addr);
1298 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1299 struct net_device *dev)
1301 unsigned int hash = ipv6_addr_hash(addr);
1302 struct inet6_ifaddr *ifp;
1303 struct hlist_node *node;
1305 hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1306 if (!net_eq(dev_net(ifp->idev->dev), net))
1308 if (ipv6_addr_equal(&ifp->addr, addr)) {
1309 if (dev == NULL || ifp->idev->dev == dev)
1316 int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev)
1318 struct inet6_dev *idev;
1319 struct inet6_ifaddr *ifa;
1324 idev = __in6_dev_get(dev);
1326 read_lock_bh(&idev->lock);
1327 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1328 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1333 read_unlock_bh(&idev->lock);
1339 EXPORT_SYMBOL(ipv6_chk_prefix);
1341 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1342 struct net_device *dev, int strict)
1344 struct inet6_ifaddr *ifp, *result = NULL;
1345 unsigned int hash = ipv6_addr_hash(addr);
1346 struct hlist_node *node;
1349 hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1350 if (!net_eq(dev_net(ifp->idev->dev), net))
1352 if (ipv6_addr_equal(&ifp->addr, addr)) {
1353 if (dev == NULL || ifp->idev->dev == dev ||
1354 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1361 rcu_read_unlock_bh();
1366 /* Gets referenced address, destroys ifaddr */
1368 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1370 if (ifp->flags&IFA_F_PERMANENT) {
1371 spin_lock_bh(&ifp->lock);
1372 addrconf_del_timer(ifp);
1373 ifp->flags |= IFA_F_TENTATIVE;
1375 ifp->flags |= IFA_F_DADFAILED;
1376 spin_unlock_bh(&ifp->lock);
1378 ipv6_ifa_notify(0, ifp);
1380 #ifdef CONFIG_IPV6_PRIVACY
1381 } else if (ifp->flags&IFA_F_TEMPORARY) {
1382 struct inet6_ifaddr *ifpub;
1383 spin_lock_bh(&ifp->lock);
1386 in6_ifa_hold(ifpub);
1387 spin_unlock_bh(&ifp->lock);
1388 ipv6_create_tempaddr(ifpub, ifp);
1391 spin_unlock_bh(&ifp->lock);
1399 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1401 struct inet6_dev *idev = ifp->idev;
1403 if (net_ratelimit())
1404 printk(KERN_INFO "%s: IPv6 duplicate address %pI6c detected!\n",
1405 ifp->idev->dev->name, &ifp->addr);
1407 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1408 struct in6_addr addr;
1410 addr.s6_addr32[0] = htonl(0xfe800000);
1411 addr.s6_addr32[1] = 0;
1413 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1414 ipv6_addr_equal(&ifp->addr, &addr)) {
1415 /* DAD failed for link-local based on MAC address */
1416 idev->cnf.disable_ipv6 = 1;
1418 printk(KERN_INFO "%s: IPv6 being disabled!\n",
1419 ifp->idev->dev->name);
1423 addrconf_dad_stop(ifp, 1);
1426 /* Join to solicited addr multicast group. */
1428 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1430 struct in6_addr maddr;
1432 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1435 addrconf_addr_solict_mult(addr, &maddr);
1436 ipv6_dev_mc_inc(dev, &maddr);
1439 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1441 struct in6_addr maddr;
1443 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1446 addrconf_addr_solict_mult(addr, &maddr);
1447 __ipv6_dev_mc_dec(idev, &maddr);
1450 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1452 struct in6_addr addr;
1453 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1454 if (ipv6_addr_any(&addr))
1456 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1459 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1461 struct in6_addr addr;
1462 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1463 if (ipv6_addr_any(&addr))
1465 __ipv6_dev_ac_dec(ifp->idev, &addr);
1468 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1470 if (dev->addr_len != ETH_ALEN)
1472 memcpy(eui, dev->dev_addr, 3);
1473 memcpy(eui + 5, dev->dev_addr + 3, 3);
1476 * The zSeries OSA network cards can be shared among various
1477 * OS instances, but the OSA cards have only one MAC address.
1478 * This leads to duplicate address conflicts in conjunction
1479 * with IPv6 if more than one instance uses the same card.
1481 * The driver for these cards can deliver a unique 16-bit
1482 * identifier for each instance sharing the same card. It is
1483 * placed instead of 0xFFFE in the interface identifier. The
1484 * "u" bit of the interface identifier is not inverted in this
1485 * case. Hence the resulting interface identifier has local
1486 * scope according to RFC2373.
1489 eui[3] = (dev->dev_id >> 8) & 0xFF;
1490 eui[4] = dev->dev_id & 0xFF;
1499 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1501 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1502 if (dev->addr_len != ARCNET_ALEN)
1505 eui[7] = *(u8*)dev->dev_addr;
1509 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1511 if (dev->addr_len != INFINIBAND_ALEN)
1513 memcpy(eui, dev->dev_addr + 12, 8);
1518 int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1522 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1523 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1524 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1525 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1526 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1527 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1531 memcpy(eui + 4, &addr, 4);
1534 EXPORT_SYMBOL(__ipv6_isatap_ifid);
1536 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1538 if (dev->priv_flags & IFF_ISATAP)
1539 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1543 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1545 switch (dev->type) {
1548 case ARPHRD_IEEE802_TR:
1549 return addrconf_ifid_eui48(eui, dev);
1551 return addrconf_ifid_arcnet(eui, dev);
1552 case ARPHRD_INFINIBAND:
1553 return addrconf_ifid_infiniband(eui, dev);
1555 return addrconf_ifid_sit(eui, dev);
1560 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1563 struct inet6_ifaddr *ifp;
1565 read_lock_bh(&idev->lock);
1566 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1567 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1568 memcpy(eui, ifp->addr.s6_addr+8, 8);
1573 read_unlock_bh(&idev->lock);
1577 #ifdef CONFIG_IPV6_PRIVACY
1578 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1579 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1582 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1583 idev->rndid[0] &= ~0x02;
1586 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1587 * check if generated address is not inappropriate
1589 * - Reserved subnet anycast (RFC 2526)
1590 * 11111101 11....11 1xxxxxxx
1591 * - ISATAP (RFC4214) 6.1
1592 * 00-00-5E-FE-xx-xx-xx-xx
1594 * - XXX: already assigned to an address on the device
1596 if (idev->rndid[0] == 0xfd &&
1597 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1598 (idev->rndid[7]&0x80))
1600 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1601 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1603 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1610 static void ipv6_regen_rndid(unsigned long data)
1612 struct inet6_dev *idev = (struct inet6_dev *) data;
1613 unsigned long expires;
1616 write_lock_bh(&idev->lock);
1621 if (__ipv6_regen_rndid(idev) < 0)
1625 idev->cnf.temp_prefered_lft * HZ -
1626 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1627 if (time_before(expires, jiffies)) {
1629 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1634 if (!mod_timer(&idev->regen_timer, expires))
1638 write_unlock_bh(&idev->lock);
1639 rcu_read_unlock_bh();
1643 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1646 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1647 ret = __ipv6_regen_rndid(idev);
1657 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1658 unsigned long expires, u32 flags)
1660 struct fib6_config cfg = {
1661 .fc_table = RT6_TABLE_PREFIX,
1662 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1663 .fc_ifindex = dev->ifindex,
1664 .fc_expires = expires,
1666 .fc_flags = RTF_UP | flags,
1667 .fc_nlinfo.nl_net = dev_net(dev),
1668 .fc_protocol = RTPROT_KERNEL,
1671 ipv6_addr_copy(&cfg.fc_dst, pfx);
1673 /* Prevent useless cloning on PtP SIT.
1674 This thing is done here expecting that the whole
1675 class of non-broadcast devices need not cloning.
1677 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1678 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1679 cfg.fc_flags |= RTF_NONEXTHOP;
1682 ip6_route_add(&cfg);
1685 /* Create "default" multicast route to the interface */
1687 static void addrconf_add_mroute(struct net_device *dev)
1689 struct fib6_config cfg = {
1690 .fc_table = RT6_TABLE_LOCAL,
1691 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1692 .fc_ifindex = dev->ifindex,
1695 .fc_nlinfo.nl_net = dev_net(dev),
1698 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1700 ip6_route_add(&cfg);
1703 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1704 static void sit_route_add(struct net_device *dev)
1706 struct fib6_config cfg = {
1707 .fc_table = RT6_TABLE_MAIN,
1708 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1709 .fc_ifindex = dev->ifindex,
1711 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1712 .fc_nlinfo.nl_net = dev_net(dev),
1715 /* prefix length - 96 bits "::d.d.d.d" */
1716 ip6_route_add(&cfg);
1720 static void addrconf_add_lroute(struct net_device *dev)
1722 struct in6_addr addr;
1724 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1725 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1728 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1730 struct inet6_dev *idev;
1734 idev = ipv6_find_idev(dev);
1738 /* Add default multicast route */
1739 addrconf_add_mroute(dev);
1741 /* Add link local route */
1742 addrconf_add_lroute(dev);
1746 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1748 struct prefix_info *pinfo;
1752 struct inet6_dev *in6_dev;
1753 struct net *net = dev_net(dev);
1755 pinfo = (struct prefix_info *) opt;
1757 if (len < sizeof(struct prefix_info)) {
1758 ADBG(("addrconf: prefix option too short\n"));
1763 * Validation checks ([ADDRCONF], page 19)
1766 addr_type = ipv6_addr_type(&pinfo->prefix);
1768 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1771 valid_lft = ntohl(pinfo->valid);
1772 prefered_lft = ntohl(pinfo->prefered);
1774 if (prefered_lft > valid_lft) {
1775 if (net_ratelimit())
1776 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1780 in6_dev = in6_dev_get(dev);
1782 if (in6_dev == NULL) {
1783 if (net_ratelimit())
1784 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1789 * Two things going on here:
1790 * 1) Add routes for on-link prefixes
1791 * 2) Configure prefixes with the auto flag set
1794 if (pinfo->onlink) {
1795 struct rt6_info *rt;
1796 unsigned long rt_expires;
1798 /* Avoid arithmetic overflow. Really, we could
1799 * save rt_expires in seconds, likely valid_lft,
1800 * but it would require division in fib gc, that it
1804 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1806 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
1808 if (addrconf_finite_timeout(rt_expires))
1811 rt = rt6_lookup(net, &pinfo->prefix, NULL,
1814 if (rt && addrconf_is_prefix_route(rt)) {
1815 /* Autoconf prefix route */
1816 if (valid_lft == 0) {
1819 } else if (addrconf_finite_timeout(rt_expires)) {
1821 rt->rt6i_expires = jiffies + rt_expires;
1822 rt->rt6i_flags |= RTF_EXPIRES;
1824 rt->rt6i_flags &= ~RTF_EXPIRES;
1825 rt->rt6i_expires = 0;
1827 } else if (valid_lft) {
1828 clock_t expires = 0;
1829 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1830 if (addrconf_finite_timeout(rt_expires)) {
1832 flags |= RTF_EXPIRES;
1833 expires = jiffies_to_clock_t(rt_expires);
1835 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1836 dev, expires, flags);
1839 dst_release(&rt->u.dst);
1842 /* Try to figure out our local address for this prefix */
1844 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1845 struct inet6_ifaddr * ifp;
1846 struct in6_addr addr;
1847 int create = 0, update_lft = 0;
1849 if (pinfo->prefix_len == 64) {
1850 memcpy(&addr, &pinfo->prefix, 8);
1851 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1852 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1853 in6_dev_put(in6_dev);
1858 if (net_ratelimit())
1859 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1861 in6_dev_put(in6_dev);
1866 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1868 if (ifp == NULL && valid_lft) {
1869 int max_addresses = in6_dev->cnf.max_addresses;
1872 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1873 if (in6_dev->cnf.optimistic_dad &&
1874 !net->ipv6.devconf_all->forwarding)
1875 addr_flags = IFA_F_OPTIMISTIC;
1878 /* Do not allow to create too much of autoconfigured
1879 * addresses; this would be too easy way to crash kernel.
1881 if (!max_addresses ||
1882 ipv6_count_addresses(in6_dev) < max_addresses)
1883 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1884 addr_type&IPV6_ADDR_SCOPE_MASK,
1887 if (!ifp || IS_ERR(ifp)) {
1888 in6_dev_put(in6_dev);
1892 update_lft = create = 1;
1893 ifp->cstamp = jiffies;
1894 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1900 #ifdef CONFIG_IPV6_PRIVACY
1901 struct inet6_ifaddr *ift;
1905 /* update lifetime (RFC2462 5.5.3 e) */
1906 spin_lock(&ifp->lock);
1908 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1909 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1912 if (!update_lft && stored_lft) {
1913 if (valid_lft > MIN_VALID_LIFETIME ||
1914 valid_lft > stored_lft)
1916 else if (stored_lft <= MIN_VALID_LIFETIME) {
1917 /* valid_lft <= stored_lft is always true */
1919 * RFC 4862 Section 5.5.3e:
1920 * "Note that the preferred lifetime of
1921 * the corresponding address is always
1922 * reset to the Preferred Lifetime in
1923 * the received Prefix Information
1924 * option, regardless of whether the
1925 * valid lifetime is also reset or
1928 * So if the preferred lifetime in
1929 * this advertisement is different
1930 * than what we have stored, but the
1931 * valid lifetime is invalid, just
1932 * reset prefered_lft.
1934 * We must set the valid lifetime
1935 * to the stored lifetime since we'll
1936 * be updating the timestamp below,
1937 * else we'll set it back to the
1940 if (prefered_lft != ifp->prefered_lft) {
1941 valid_lft = stored_lft;
1945 valid_lft = MIN_VALID_LIFETIME;
1946 if (valid_lft < prefered_lft)
1947 prefered_lft = valid_lft;
1953 ifp->valid_lft = valid_lft;
1954 ifp->prefered_lft = prefered_lft;
1957 ifp->flags &= ~IFA_F_DEPRECATED;
1958 spin_unlock(&ifp->lock);
1960 if (!(flags&IFA_F_TENTATIVE))
1961 ipv6_ifa_notify(0, ifp);
1963 spin_unlock(&ifp->lock);
1965 #ifdef CONFIG_IPV6_PRIVACY
1966 read_lock_bh(&in6_dev->lock);
1967 /* update all temporary addresses in the list */
1968 list_for_each_entry(ift, &in6_dev->tempaddr_list, tmp_list) {
1970 * When adjusting the lifetimes of an existing
1971 * temporary address, only lower the lifetimes.
1972 * Implementations must not increase the
1973 * lifetimes of an existing temporary address
1974 * when processing a Prefix Information Option.
1976 if (ifp != ift->ifpub)
1979 spin_lock(&ift->lock);
1981 if (ift->valid_lft > valid_lft &&
1982 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1983 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1984 if (ift->prefered_lft > prefered_lft &&
1985 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1986 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1987 spin_unlock(&ift->lock);
1988 if (!(flags&IFA_F_TENTATIVE))
1989 ipv6_ifa_notify(0, ift);
1992 if (create && in6_dev->cnf.use_tempaddr > 0) {
1994 * When a new public address is created as described in [ADDRCONF],
1995 * also create a new temporary address.
1997 read_unlock_bh(&in6_dev->lock);
1998 ipv6_create_tempaddr(ifp, NULL);
2000 read_unlock_bh(&in6_dev->lock);
2007 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2008 in6_dev_put(in6_dev);
2012 * Set destination address.
2013 * Special case for SIT interfaces where we create a new "virtual"
2016 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2018 struct in6_ifreq ireq;
2019 struct net_device *dev;
2025 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2028 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2034 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2035 if (dev->type == ARPHRD_SIT) {
2036 const struct net_device_ops *ops = dev->netdev_ops;
2038 struct ip_tunnel_parm p;
2040 err = -EADDRNOTAVAIL;
2041 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2044 memset(&p, 0, sizeof(p));
2045 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2049 p.iph.protocol = IPPROTO_IPV6;
2051 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2053 if (ops->ndo_do_ioctl) {
2054 mm_segment_t oldfs = get_fs();
2057 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2064 dev = __dev_get_by_name(net, p.name);
2067 err = dev_open(dev);
2078 * Manual configuration of address on an interface
2080 static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx,
2081 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2084 struct inet6_ifaddr *ifp;
2085 struct inet6_dev *idev;
2086 struct net_device *dev;
2090 unsigned long timeout;
2097 /* check the lifetime */
2098 if (!valid_lft || prefered_lft > valid_lft)
2101 dev = __dev_get_by_index(net, ifindex);
2105 if ((idev = addrconf_add_dev(dev)) == NULL)
2108 scope = ipv6_addr_scope(pfx);
2110 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2111 if (addrconf_finite_timeout(timeout)) {
2112 expires = jiffies_to_clock_t(timeout * HZ);
2113 valid_lft = timeout;
2114 flags = RTF_EXPIRES;
2118 ifa_flags |= IFA_F_PERMANENT;
2121 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2122 if (addrconf_finite_timeout(timeout)) {
2124 ifa_flags |= IFA_F_DEPRECATED;
2125 prefered_lft = timeout;
2128 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2131 spin_lock_bh(&ifp->lock);
2132 ifp->valid_lft = valid_lft;
2133 ifp->prefered_lft = prefered_lft;
2134 ifp->tstamp = jiffies;
2135 spin_unlock_bh(&ifp->lock);
2137 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2140 * Note that section 3.1 of RFC 4429 indicates
2141 * that the Optimistic flag should not be set for
2142 * manually configured addresses
2144 addrconf_dad_start(ifp, 0);
2150 return PTR_ERR(ifp);
2153 static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx,
2156 struct inet6_ifaddr *ifp;
2157 struct inet6_dev *idev;
2158 struct net_device *dev;
2163 dev = __dev_get_by_index(net, ifindex);
2167 if ((idev = __in6_dev_get(dev)) == NULL)
2170 read_lock_bh(&idev->lock);
2171 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2172 if (ifp->prefix_len == plen &&
2173 ipv6_addr_equal(pfx, &ifp->addr)) {
2175 read_unlock_bh(&idev->lock);
2179 /* If the last address is deleted administratively,
2180 disable IPv6 on this interface.
2182 if (list_empty(&idev->addr_list))
2183 addrconf_ifdown(idev->dev, 1);
2187 read_unlock_bh(&idev->lock);
2188 return -EADDRNOTAVAIL;
2192 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2194 struct in6_ifreq ireq;
2197 if (!capable(CAP_NET_ADMIN))
2200 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2204 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2205 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2206 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2211 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2213 struct in6_ifreq ireq;
2216 if (!capable(CAP_NET_ADMIN))
2219 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2223 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2224 ireq.ifr6_prefixlen);
2229 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2230 int plen, int scope)
2232 struct inet6_ifaddr *ifp;
2234 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2236 spin_lock_bh(&ifp->lock);
2237 ifp->flags &= ~IFA_F_TENTATIVE;
2238 spin_unlock_bh(&ifp->lock);
2239 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2244 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2245 static void sit_add_v4_addrs(struct inet6_dev *idev)
2247 struct in6_addr addr;
2248 struct net_device *dev;
2249 struct net *net = dev_net(idev->dev);
2254 memset(&addr, 0, sizeof(struct in6_addr));
2255 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2257 if (idev->dev->flags&IFF_POINTOPOINT) {
2258 addr.s6_addr32[0] = htonl(0xfe800000);
2261 scope = IPV6_ADDR_COMPATv4;
2264 if (addr.s6_addr32[3]) {
2265 add_addr(idev, &addr, 128, scope);
2269 for_each_netdev(net, dev) {
2270 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2271 if (in_dev && (dev->flags & IFF_UP)) {
2272 struct in_ifaddr * ifa;
2276 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2279 addr.s6_addr32[3] = ifa->ifa_local;
2281 if (ifa->ifa_scope == RT_SCOPE_LINK)
2283 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2284 if (idev->dev->flags&IFF_POINTOPOINT)
2288 if (idev->dev->flags&IFF_POINTOPOINT)
2293 add_addr(idev, &addr, plen, flag);
2300 static void init_loopback(struct net_device *dev)
2302 struct inet6_dev *idev;
2308 if ((idev = ipv6_find_idev(dev)) == NULL) {
2309 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2313 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2316 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2318 struct inet6_ifaddr * ifp;
2319 u32 addr_flags = IFA_F_PERMANENT;
2321 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2322 if (idev->cnf.optimistic_dad &&
2323 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2324 addr_flags |= IFA_F_OPTIMISTIC;
2328 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2330 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2331 addrconf_dad_start(ifp, 0);
2336 static void addrconf_dev_config(struct net_device *dev)
2338 struct in6_addr addr;
2339 struct inet6_dev * idev;
2343 if ((dev->type != ARPHRD_ETHER) &&
2344 (dev->type != ARPHRD_FDDI) &&
2345 (dev->type != ARPHRD_IEEE802_TR) &&
2346 (dev->type != ARPHRD_ARCNET) &&
2347 (dev->type != ARPHRD_INFINIBAND)) {
2348 /* Alas, we support only Ethernet autoconfiguration. */
2352 idev = addrconf_add_dev(dev);
2356 memset(&addr, 0, sizeof(struct in6_addr));
2357 addr.s6_addr32[0] = htonl(0xFE800000);
2359 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2360 addrconf_add_linklocal(idev, &addr);
2363 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2364 static void addrconf_sit_config(struct net_device *dev)
2366 struct inet6_dev *idev;
2371 * Configure the tunnel with one of our IPv4
2372 * addresses... we should configure all of
2373 * our v4 addrs in the tunnel
2376 if ((idev = ipv6_find_idev(dev)) == NULL) {
2377 printk(KERN_DEBUG "init sit: add_dev failed\n");
2381 if (dev->priv_flags & IFF_ISATAP) {
2382 struct in6_addr addr;
2384 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2385 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2386 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2387 addrconf_add_linklocal(idev, &addr);
2391 sit_add_v4_addrs(idev);
2393 if (dev->flags&IFF_POINTOPOINT) {
2394 addrconf_add_mroute(dev);
2395 addrconf_add_lroute(dev);
2402 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2404 struct in6_addr lladdr;
2406 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2407 addrconf_add_linklocal(idev, &lladdr);
2413 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2415 struct net_device *link_dev;
2416 struct net *net = dev_net(idev->dev);
2418 /* first try to inherit the link-local address from the link device */
2419 if (idev->dev->iflink &&
2420 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2421 if (!ipv6_inherit_linklocal(idev, link_dev))
2424 /* then try to inherit it from any device */
2425 for_each_netdev(net, link_dev) {
2426 if (!ipv6_inherit_linklocal(idev, link_dev))
2429 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2433 * Autoconfigure tunnel with a link-local address so routing protocols,
2434 * DHCPv6, MLD etc. can be run over the virtual link
2437 static void addrconf_ip6_tnl_config(struct net_device *dev)
2439 struct inet6_dev *idev;
2443 idev = addrconf_add_dev(dev);
2445 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2448 ip6_tnl_add_linklocal(idev);
2451 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2454 struct net_device *dev = (struct net_device *) data;
2455 struct inet6_dev *idev = __in6_dev_get(dev);
2456 int run_pending = 0;
2460 case NETDEV_REGISTER:
2461 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2462 idev = ipv6_add_dev(dev);
2464 return notifier_from_errno(-ENOMEM);
2470 if (dev->flags & IFF_SLAVE)
2473 if (event == NETDEV_UP) {
2474 if (!addrconf_qdisc_ok(dev)) {
2475 /* device is not ready yet. */
2477 "ADDRCONF(NETDEV_UP): %s: "
2478 "link is not ready\n",
2483 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2484 idev = ipv6_add_dev(dev);
2487 idev->if_flags |= IF_READY;
2491 if (!addrconf_qdisc_ok(dev)) {
2492 /* device is still not ready. */
2497 if (idev->if_flags & IF_READY)
2498 /* device is already configured. */
2500 idev->if_flags |= IF_READY;
2504 "ADDRCONF(NETDEV_CHANGE): %s: "
2505 "link becomes ready\n",
2511 switch (dev->type) {
2512 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2514 addrconf_sit_config(dev);
2517 case ARPHRD_TUNNEL6:
2518 addrconf_ip6_tnl_config(dev);
2520 case ARPHRD_LOOPBACK:
2525 addrconf_dev_config(dev);
2531 addrconf_dad_run(idev);
2534 * If the MTU changed during the interface down,
2535 * when the interface up, the changed MTU must be
2536 * reflected in the idev as well as routers.
2538 if (idev->cnf.mtu6 != dev->mtu &&
2539 dev->mtu >= IPV6_MIN_MTU) {
2540 rt6_mtu_change(dev, dev->mtu);
2541 idev->cnf.mtu6 = dev->mtu;
2543 idev->tstamp = jiffies;
2544 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2547 * If the changed mtu during down is lower than
2548 * IPV6_MIN_MTU stop IPv6 on this interface.
2550 if (dev->mtu < IPV6_MIN_MTU)
2551 addrconf_ifdown(dev, 1);
2555 case NETDEV_CHANGEMTU:
2556 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2557 rt6_mtu_change(dev, dev->mtu);
2558 idev->cnf.mtu6 = dev->mtu;
2562 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2563 idev = ipv6_add_dev(dev);
2569 * MTU falled under IPV6_MIN_MTU.
2570 * Stop IPv6 on this interface.
2574 case NETDEV_UNREGISTER:
2576 * Remove all addresses from this interface.
2578 addrconf_ifdown(dev, event != NETDEV_DOWN);
2581 case NETDEV_CHANGENAME:
2583 snmp6_unregister_dev(idev);
2584 addrconf_sysctl_unregister(idev);
2585 addrconf_sysctl_register(idev);
2586 err = snmp6_register_dev(idev);
2588 return notifier_from_errno(err);
2592 case NETDEV_PRE_TYPE_CHANGE:
2593 case NETDEV_POST_TYPE_CHANGE:
2594 addrconf_type_change(dev, event);
2602 * addrconf module should be notified of a device going up
2604 static struct notifier_block ipv6_dev_notf = {
2605 .notifier_call = addrconf_notify,
2608 static void addrconf_type_change(struct net_device *dev, unsigned long event)
2610 struct inet6_dev *idev;
2613 idev = __in6_dev_get(dev);
2615 if (event == NETDEV_POST_TYPE_CHANGE)
2616 ipv6_mc_remap(idev);
2617 else if (event == NETDEV_PRE_TYPE_CHANGE)
2618 ipv6_mc_unmap(idev);
2621 static int addrconf_ifdown(struct net_device *dev, int how)
2623 struct net *net = dev_net(dev);
2624 struct inet6_dev *idev;
2625 struct inet6_ifaddr *ifa;
2626 LIST_HEAD(keep_list);
2630 rt6_ifdown(net, dev);
2631 neigh_ifdown(&nd_tbl, dev);
2633 idev = __in6_dev_get(dev);
2638 * Step 1: remove reference to ipv6 device from parent device.
2644 /* protected by rtnl_lock */
2645 rcu_assign_pointer(dev->ip6_ptr, NULL);
2647 /* Step 1.5: remove snmp6 entry */
2648 snmp6_unregister_dev(idev);
2652 write_lock_bh(&idev->lock);
2654 /* Step 2: clear flags for stateless addrconf */
2656 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2658 #ifdef CONFIG_IPV6_PRIVACY
2659 if (how && del_timer(&idev->regen_timer))
2662 /* Step 3: clear tempaddr list */
2663 while (!list_empty(&idev->tempaddr_list)) {
2664 ifa = list_first_entry(&idev->tempaddr_list,
2665 struct inet6_ifaddr, tmp_list);
2666 list_del(&ifa->tmp_list);
2668 write_unlock_bh(&idev->lock);
2669 spin_lock_bh(&ifa->lock);
2672 in6_ifa_put(ifa->ifpub);
2675 spin_unlock_bh(&ifa->lock);
2677 write_lock_bh(&idev->lock);
2681 while (!list_empty(&idev->addr_list)) {
2682 ifa = list_first_entry(&idev->addr_list,
2683 struct inet6_ifaddr, if_list);
2684 addrconf_del_timer(ifa);
2686 /* If just doing link down, and address is permanent
2687 and not link-local, then retain it. */
2689 (ifa->flags&IFA_F_PERMANENT) &&
2690 !(ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL)) {
2691 list_move_tail(&ifa->if_list, &keep_list);
2693 /* If not doing DAD on this address, just keep it. */
2694 if ((dev->flags&(IFF_NOARP|IFF_LOOPBACK)) ||
2695 idev->cnf.accept_dad <= 0 ||
2696 (ifa->flags & IFA_F_NODAD))
2699 /* If it was tentative already, no need to notify */
2700 if (ifa->flags & IFA_F_TENTATIVE)
2703 /* Flag it for later restoration when link comes up */
2704 ifa->flags |= IFA_F_TENTATIVE;
2707 list_del(&ifa->if_list);
2710 write_unlock_bh(&idev->lock);
2712 /* clear hash table */
2713 spin_lock_bh(&addrconf_hash_lock);
2714 hlist_del_init_rcu(&ifa->addr_lst);
2716 spin_unlock_bh(&addrconf_hash_lock);
2718 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2719 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2722 write_lock_bh(&idev->lock);
2725 list_splice(&keep_list, &idev->addr_list);
2727 write_unlock_bh(&idev->lock);
2729 /* Step 5: Discard multicast list */
2731 ipv6_mc_destroy_dev(idev);
2735 idev->tstamp = jiffies;
2737 /* Last: Shot the device (if unregistered) */
2739 addrconf_sysctl_unregister(idev);
2740 neigh_parms_release(&nd_tbl, idev->nd_parms);
2741 neigh_ifdown(&nd_tbl, dev);
2747 static void addrconf_rs_timer(unsigned long data)
2749 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2750 struct inet6_dev *idev = ifp->idev;
2752 read_lock(&idev->lock);
2753 if (idev->dead || !(idev->if_flags & IF_READY))
2756 if (idev->cnf.forwarding)
2759 /* Announcement received after solicitation was sent */
2760 if (idev->if_flags & IF_RA_RCVD)
2763 spin_lock(&ifp->lock);
2764 if (ifp->probes++ < idev->cnf.rtr_solicits) {
2765 /* The wait after the last probe can be shorter */
2766 addrconf_mod_timer(ifp, AC_RS,
2767 (ifp->probes == idev->cnf.rtr_solicits) ?
2768 idev->cnf.rtr_solicit_delay :
2769 idev->cnf.rtr_solicit_interval);
2770 spin_unlock(&ifp->lock);
2772 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2774 spin_unlock(&ifp->lock);
2776 * Note: we do not support deprecated "all on-link"
2777 * assumption any longer.
2779 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2784 read_unlock(&idev->lock);
2789 * Duplicate Address Detection
2791 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2793 unsigned long rand_num;
2794 struct inet6_dev *idev = ifp->idev;
2796 if (ifp->flags & IFA_F_OPTIMISTIC)
2799 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2801 ifp->probes = idev->cnf.dad_transmits;
2802 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2805 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2807 struct inet6_dev *idev = ifp->idev;
2808 struct net_device *dev = idev->dev;
2810 addrconf_join_solict(dev, &ifp->addr);
2812 net_srandom(ifp->addr.s6_addr32[3]);
2814 read_lock_bh(&idev->lock);
2818 spin_lock(&ifp->lock);
2819 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2820 idev->cnf.accept_dad < 1 ||
2821 !(ifp->flags&IFA_F_TENTATIVE) ||
2822 ifp->flags & IFA_F_NODAD) {
2823 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2824 spin_unlock(&ifp->lock);
2825 read_unlock_bh(&idev->lock);
2827 addrconf_dad_completed(ifp);
2831 if (!(idev->if_flags & IF_READY)) {
2832 spin_unlock(&ifp->lock);
2833 read_unlock_bh(&idev->lock);
2835 * If the device is not ready:
2836 * - keep it tentative if it is a permanent address.
2837 * - otherwise, kill it.
2840 addrconf_dad_stop(ifp, 0);
2845 * Optimistic nodes can start receiving
2848 if (ifp->flags & IFA_F_OPTIMISTIC)
2849 ip6_ins_rt(ifp->rt);
2851 addrconf_dad_kick(ifp);
2852 spin_unlock(&ifp->lock);
2854 read_unlock_bh(&idev->lock);
2857 static void addrconf_dad_timer(unsigned long data)
2859 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2860 struct inet6_dev *idev = ifp->idev;
2861 struct in6_addr mcaddr;
2863 read_lock(&idev->lock);
2864 if (idev->dead || !(idev->if_flags & IF_READY)) {
2865 read_unlock(&idev->lock);
2869 spin_lock(&ifp->lock);
2870 if (ifp->probes == 0) {
2872 * DAD was successful
2875 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2876 spin_unlock(&ifp->lock);
2877 read_unlock(&idev->lock);
2879 addrconf_dad_completed(ifp);
2885 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2886 spin_unlock(&ifp->lock);
2887 read_unlock(&idev->lock);
2889 /* send a neighbour solicitation for our addr */
2890 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2891 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
2896 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2898 struct net_device *dev = ifp->idev->dev;
2901 * Configure the address for reception. Now it is valid.
2904 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2906 /* If added prefix is link local and forwarding is off,
2907 start sending router solicitations.
2910 if (ifp->idev->cnf.forwarding == 0 &&
2911 ifp->idev->cnf.rtr_solicits > 0 &&
2912 (dev->flags&IFF_LOOPBACK) == 0 &&
2913 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2915 * If a host as already performed a random delay
2916 * [...] as part of DAD [...] there is no need
2917 * to delay again before sending the first RS
2919 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2921 spin_lock_bh(&ifp->lock);
2923 ifp->idev->if_flags |= IF_RS_SENT;
2924 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2925 spin_unlock_bh(&ifp->lock);
2929 static void addrconf_dad_run(struct inet6_dev *idev)
2931 struct inet6_ifaddr *ifp;
2933 read_lock_bh(&idev->lock);
2934 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2935 spin_lock(&ifp->lock);
2936 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2937 spin_unlock(&ifp->lock);
2940 spin_unlock(&ifp->lock);
2941 addrconf_dad_kick(ifp);
2943 read_unlock_bh(&idev->lock);
2946 #ifdef CONFIG_PROC_FS
2947 struct if6_iter_state {
2948 struct seq_net_private p;
2952 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2954 struct inet6_ifaddr *ifa = NULL;
2955 struct if6_iter_state *state = seq->private;
2956 struct net *net = seq_file_net(seq);
2958 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2959 struct hlist_node *n;
2960 hlist_for_each_entry_rcu(ifa, n, &inet6_addr_lst[state->bucket],
2962 if (net_eq(dev_net(ifa->idev->dev), net))
2968 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
2969 struct inet6_ifaddr *ifa)
2971 struct if6_iter_state *state = seq->private;
2972 struct net *net = seq_file_net(seq);
2973 struct hlist_node *n = &ifa->addr_lst;
2975 hlist_for_each_entry_continue_rcu(ifa, n, addr_lst)
2976 if (net_eq(dev_net(ifa->idev->dev), net))
2979 while (++state->bucket < IN6_ADDR_HSIZE) {
2980 hlist_for_each_entry(ifa, n,
2981 &inet6_addr_lst[state->bucket], addr_lst) {
2982 if (net_eq(dev_net(ifa->idev->dev), net))
2990 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2992 struct inet6_ifaddr *ifa = if6_get_first(seq);
2995 while (pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2997 return pos ? NULL : ifa;
3000 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3004 return if6_get_idx(seq, *pos);
3007 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3009 struct inet6_ifaddr *ifa;
3011 ifa = if6_get_next(seq, v);
3016 static void if6_seq_stop(struct seq_file *seq, void *v)
3019 rcu_read_unlock_bh();
3022 static int if6_seq_show(struct seq_file *seq, void *v)
3024 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3025 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3027 ifp->idev->dev->ifindex,
3031 ifp->idev->dev->name);
3035 static const struct seq_operations if6_seq_ops = {
3036 .start = if6_seq_start,
3037 .next = if6_seq_next,
3038 .show = if6_seq_show,
3039 .stop = if6_seq_stop,
3042 static int if6_seq_open(struct inode *inode, struct file *file)
3044 return seq_open_net(inode, file, &if6_seq_ops,
3045 sizeof(struct if6_iter_state));
3048 static const struct file_operations if6_fops = {
3049 .owner = THIS_MODULE,
3050 .open = if6_seq_open,
3052 .llseek = seq_lseek,
3053 .release = seq_release_net,
3056 static int __net_init if6_proc_net_init(struct net *net)
3058 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
3063 static void __net_exit if6_proc_net_exit(struct net *net)
3065 proc_net_remove(net, "if_inet6");
3068 static struct pernet_operations if6_proc_net_ops = {
3069 .init = if6_proc_net_init,
3070 .exit = if6_proc_net_exit,
3073 int __init if6_proc_init(void)
3075 return register_pernet_subsys(&if6_proc_net_ops);
3078 void if6_proc_exit(void)
3080 unregister_pernet_subsys(&if6_proc_net_ops);
3082 #endif /* CONFIG_PROC_FS */
3084 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3085 /* Check if address is a home address configured on any interface. */
3086 int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
3089 struct inet6_ifaddr *ifp = NULL;
3090 struct hlist_node *n;
3091 unsigned int hash = ipv6_addr_hash(addr);
3094 hlist_for_each_entry_rcu(ifp, n, &inet6_addr_lst[hash], addr_lst) {
3095 if (!net_eq(dev_net(ifp->idev->dev), net))
3097 if (ipv6_addr_equal(&ifp->addr, addr) &&
3098 (ifp->flags & IFA_F_HOMEADDRESS)) {
3103 rcu_read_unlock_bh();
3109 * Periodic address status verification
3112 static void addrconf_verify(unsigned long foo)
3114 unsigned long now, next, next_sec, next_sched;
3115 struct inet6_ifaddr *ifp;
3116 struct hlist_node *node;
3120 spin_lock(&addrconf_verify_lock);
3122 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3124 del_timer(&addr_chk_timer);
3126 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3128 hlist_for_each_entry_rcu(ifp, node,
3129 &inet6_addr_lst[i], addr_lst) {
3132 if (ifp->flags & IFA_F_PERMANENT)
3135 spin_lock(&ifp->lock);
3136 /* We try to batch several events at once. */
3137 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3139 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3140 age >= ifp->valid_lft) {
3141 spin_unlock(&ifp->lock);
3145 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3146 spin_unlock(&ifp->lock);
3148 } else if (age >= ifp->prefered_lft) {
3149 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3152 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3154 ifp->flags |= IFA_F_DEPRECATED;
3157 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3158 next = ifp->tstamp + ifp->valid_lft * HZ;
3160 spin_unlock(&ifp->lock);
3165 ipv6_ifa_notify(0, ifp);
3169 #ifdef CONFIG_IPV6_PRIVACY
3170 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3171 !(ifp->flags&IFA_F_TENTATIVE)) {
3172 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3173 ifp->idev->cnf.dad_transmits *
3174 ifp->idev->nd_parms->retrans_time / HZ;
3176 if (age >= ifp->prefered_lft - regen_advance) {
3177 struct inet6_ifaddr *ifpub = ifp->ifpub;
3178 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3179 next = ifp->tstamp + ifp->prefered_lft * HZ;
3180 if (!ifp->regen_count && ifpub) {
3183 in6_ifa_hold(ifpub);
3184 spin_unlock(&ifp->lock);
3186 spin_lock(&ifpub->lock);
3187 ifpub->regen_count = 0;
3188 spin_unlock(&ifpub->lock);
3189 ipv6_create_tempaddr(ifpub, ifp);
3194 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3195 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3196 spin_unlock(&ifp->lock);
3199 /* ifp->prefered_lft <= ifp->valid_lft */
3200 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3201 next = ifp->tstamp + ifp->prefered_lft * HZ;
3202 spin_unlock(&ifp->lock);
3207 next_sec = round_jiffies_up(next);
3210 /* If rounded timeout is accurate enough, accept it. */
3211 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3212 next_sched = next_sec;
3214 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3215 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3216 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3218 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3219 now, next, next_sec, next_sched));
3221 addr_chk_timer.expires = next_sched;
3222 add_timer(&addr_chk_timer);
3223 spin_unlock(&addrconf_verify_lock);
3224 rcu_read_unlock_bh();
3227 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3229 struct in6_addr *pfx = NULL;
3232 pfx = nla_data(addr);
3235 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3238 pfx = nla_data(local);
3244 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3245 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3246 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3247 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3251 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3253 struct net *net = sock_net(skb->sk);
3254 struct ifaddrmsg *ifm;
3255 struct nlattr *tb[IFA_MAX+1];
3256 struct in6_addr *pfx;
3259 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3263 ifm = nlmsg_data(nlh);
3264 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3268 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3271 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3272 u32 prefered_lft, u32 valid_lft)
3276 unsigned long timeout;
3278 if (!valid_lft || (prefered_lft > valid_lft))
3281 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3282 if (addrconf_finite_timeout(timeout)) {
3283 expires = jiffies_to_clock_t(timeout * HZ);
3284 valid_lft = timeout;
3285 flags = RTF_EXPIRES;
3289 ifa_flags |= IFA_F_PERMANENT;
3292 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3293 if (addrconf_finite_timeout(timeout)) {
3295 ifa_flags |= IFA_F_DEPRECATED;
3296 prefered_lft = timeout;
3299 spin_lock_bh(&ifp->lock);
3300 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3301 ifp->tstamp = jiffies;
3302 ifp->valid_lft = valid_lft;
3303 ifp->prefered_lft = prefered_lft;
3305 spin_unlock_bh(&ifp->lock);
3306 if (!(ifp->flags&IFA_F_TENTATIVE))
3307 ipv6_ifa_notify(0, ifp);
3309 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3317 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3319 struct net *net = sock_net(skb->sk);
3320 struct ifaddrmsg *ifm;
3321 struct nlattr *tb[IFA_MAX+1];
3322 struct in6_addr *pfx;
3323 struct inet6_ifaddr *ifa;
3324 struct net_device *dev;
3325 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3329 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3333 ifm = nlmsg_data(nlh);
3334 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3338 if (tb[IFA_CACHEINFO]) {
3339 struct ifa_cacheinfo *ci;
3341 ci = nla_data(tb[IFA_CACHEINFO]);
3342 valid_lft = ci->ifa_valid;
3343 preferred_lft = ci->ifa_prefered;
3345 preferred_lft = INFINITY_LIFE_TIME;
3346 valid_lft = INFINITY_LIFE_TIME;
3349 dev = __dev_get_by_index(net, ifm->ifa_index);
3353 /* We ignore other flags so far. */
3354 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3356 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3359 * It would be best to check for !NLM_F_CREATE here but
3360 * userspace alreay relies on not having to provide this.
3362 return inet6_addr_add(net, ifm->ifa_index, pfx,
3363 ifm->ifa_prefixlen, ifa_flags,
3364 preferred_lft, valid_lft);
3367 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3368 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3371 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3378 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3379 u8 scope, int ifindex)
3381 struct ifaddrmsg *ifm;
3383 ifm = nlmsg_data(nlh);
3384 ifm->ifa_family = AF_INET6;
3385 ifm->ifa_prefixlen = prefixlen;
3386 ifm->ifa_flags = flags;
3387 ifm->ifa_scope = scope;
3388 ifm->ifa_index = ifindex;
3391 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3392 unsigned long tstamp, u32 preferred, u32 valid)
3394 struct ifa_cacheinfo ci;
3396 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3397 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3398 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3399 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3400 ci.ifa_prefered = preferred;
3401 ci.ifa_valid = valid;
3403 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3406 static inline int rt_scope(int ifa_scope)
3408 if (ifa_scope & IFA_HOST)
3409 return RT_SCOPE_HOST;
3410 else if (ifa_scope & IFA_LINK)
3411 return RT_SCOPE_LINK;
3412 else if (ifa_scope & IFA_SITE)
3413 return RT_SCOPE_SITE;
3415 return RT_SCOPE_UNIVERSE;
3418 static inline int inet6_ifaddr_msgsize(void)
3420 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3421 + nla_total_size(16) /* IFA_ADDRESS */
3422 + nla_total_size(sizeof(struct ifa_cacheinfo));
3425 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3426 u32 pid, u32 seq, int event, unsigned int flags)
3428 struct nlmsghdr *nlh;
3429 u32 preferred, valid;
3431 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3435 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3436 ifa->idev->dev->ifindex);
3438 if (!(ifa->flags&IFA_F_PERMANENT)) {
3439 preferred = ifa->prefered_lft;
3440 valid = ifa->valid_lft;
3441 if (preferred != INFINITY_LIFE_TIME) {
3442 long tval = (jiffies - ifa->tstamp)/HZ;
3443 if (preferred > tval)
3447 if (valid != INFINITY_LIFE_TIME)
3451 preferred = INFINITY_LIFE_TIME;
3452 valid = INFINITY_LIFE_TIME;
3455 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3456 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3457 nlmsg_cancel(skb, nlh);
3461 return nlmsg_end(skb, nlh);
3464 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3465 u32 pid, u32 seq, int event, u16 flags)
3467 struct nlmsghdr *nlh;
3468 u8 scope = RT_SCOPE_UNIVERSE;
3469 int ifindex = ifmca->idev->dev->ifindex;
3471 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3472 scope = RT_SCOPE_SITE;
3474 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3478 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3479 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3480 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3481 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3482 nlmsg_cancel(skb, nlh);
3486 return nlmsg_end(skb, nlh);
3489 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3490 u32 pid, u32 seq, int event, unsigned int flags)
3492 struct nlmsghdr *nlh;
3493 u8 scope = RT_SCOPE_UNIVERSE;
3494 int ifindex = ifaca->aca_idev->dev->ifindex;
3496 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3497 scope = RT_SCOPE_SITE;
3499 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3503 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3504 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3505 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3506 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3507 nlmsg_cancel(skb, nlh);
3511 return nlmsg_end(skb, nlh);
3520 /* called with rcu_read_lock() */
3521 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3522 struct netlink_callback *cb, enum addr_type_t type,
3523 int s_ip_idx, int *p_ip_idx)
3525 struct ifmcaddr6 *ifmca;
3526 struct ifacaddr6 *ifaca;
3528 int ip_idx = *p_ip_idx;
3530 read_lock_bh(&idev->lock);
3532 case UNICAST_ADDR: {
3533 struct inet6_ifaddr *ifa;
3535 /* unicast address incl. temp addr */
3536 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3537 if (++ip_idx < s_ip_idx)
3539 err = inet6_fill_ifaddr(skb, ifa,
3540 NETLINK_CB(cb->skb).pid,
3549 case MULTICAST_ADDR:
3550 /* multicast address */
3551 for (ifmca = idev->mc_list; ifmca;
3552 ifmca = ifmca->next, ip_idx++) {
3553 if (ip_idx < s_ip_idx)
3555 err = inet6_fill_ifmcaddr(skb, ifmca,
3556 NETLINK_CB(cb->skb).pid,
3565 /* anycast address */
3566 for (ifaca = idev->ac_list; ifaca;
3567 ifaca = ifaca->aca_next, ip_idx++) {
3568 if (ip_idx < s_ip_idx)
3570 err = inet6_fill_ifacaddr(skb, ifaca,
3571 NETLINK_CB(cb->skb).pid,
3582 read_unlock_bh(&idev->lock);
3587 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3588 enum addr_type_t type)
3590 struct net *net = sock_net(skb->sk);
3593 int s_idx, s_ip_idx;
3594 struct net_device *dev;
3595 struct inet6_dev *idev;
3596 struct hlist_head *head;
3597 struct hlist_node *node;
3600 s_idx = idx = cb->args[1];
3601 s_ip_idx = ip_idx = cb->args[2];
3604 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3606 head = &net->dev_index_head[h];
3607 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3613 idev = __in6_dev_get(dev);
3617 if (in6_dump_addrs(idev, skb, cb, type,
3618 s_ip_idx, &ip_idx) <= 0)
3628 cb->args[2] = ip_idx;
3633 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3635 enum addr_type_t type = UNICAST_ADDR;
3637 return inet6_dump_addr(skb, cb, type);
3640 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3642 enum addr_type_t type = MULTICAST_ADDR;
3644 return inet6_dump_addr(skb, cb, type);
3648 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3650 enum addr_type_t type = ANYCAST_ADDR;
3652 return inet6_dump_addr(skb, cb, type);
3655 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3658 struct net *net = sock_net(in_skb->sk);
3659 struct ifaddrmsg *ifm;
3660 struct nlattr *tb[IFA_MAX+1];
3661 struct in6_addr *addr = NULL;
3662 struct net_device *dev = NULL;
3663 struct inet6_ifaddr *ifa;
3664 struct sk_buff *skb;
3667 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3671 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3677 ifm = nlmsg_data(nlh);
3679 dev = __dev_get_by_index(net, ifm->ifa_index);
3681 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
3683 err = -EADDRNOTAVAIL;
3687 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
3693 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3694 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3696 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3697 WARN_ON(err == -EMSGSIZE);
3701 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
3708 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3710 struct sk_buff *skb;
3711 struct net *net = dev_net(ifa->idev->dev);
3714 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3718 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3720 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3721 WARN_ON(err == -EMSGSIZE);
3725 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3729 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3732 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3733 __s32 *array, int bytes)
3735 BUG_ON(bytes < (DEVCONF_MAX * 4));
3737 memset(array, 0, bytes);
3738 array[DEVCONF_FORWARDING] = cnf->forwarding;
3739 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3740 array[DEVCONF_MTU6] = cnf->mtu6;
3741 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3742 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3743 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3744 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3745 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3746 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3747 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3748 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3749 #ifdef CONFIG_IPV6_PRIVACY
3750 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3751 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3752 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3753 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3754 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3756 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3757 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3758 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3759 #ifdef CONFIG_IPV6_ROUTER_PREF
3760 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3761 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3762 #ifdef CONFIG_IPV6_ROUTE_INFO
3763 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3766 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3767 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3768 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3769 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3771 #ifdef CONFIG_IPV6_MROUTE
3772 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3774 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
3775 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
3776 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
3779 static inline size_t inet6_if_nlmsg_size(void)
3781 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3782 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3783 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3784 + nla_total_size(4) /* IFLA_MTU */
3785 + nla_total_size(4) /* IFLA_LINK */
3786 + nla_total_size( /* IFLA_PROTINFO */
3787 nla_total_size(4) /* IFLA_INET6_FLAGS */
3788 + nla_total_size(sizeof(struct ifla_cacheinfo))
3789 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3790 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3791 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
3795 static inline void __snmp6_fill_stats(u64 *stats, void __percpu **mib,
3796 int items, int bytes)
3799 int pad = bytes - sizeof(u64) * items;
3802 /* Use put_unaligned() because stats may not be aligned for u64. */
3803 put_unaligned(items, &stats[0]);
3804 for (i = 1; i < items; i++)
3805 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3807 memset(&stats[items], 0, pad);
3810 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3814 case IFLA_INET6_STATS:
3815 __snmp6_fill_stats(stats, (void __percpu **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3817 case IFLA_INET6_ICMP6STATS:
3818 __snmp6_fill_stats(stats, (void __percpu **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3823 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3824 u32 pid, u32 seq, int event, unsigned int flags)
3826 struct net_device *dev = idev->dev;
3828 struct ifinfomsg *hdr;
3829 struct nlmsghdr *nlh;
3831 struct ifla_cacheinfo ci;
3833 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3837 hdr = nlmsg_data(nlh);
3838 hdr->ifi_family = AF_INET6;
3840 hdr->ifi_type = dev->type;
3841 hdr->ifi_index = dev->ifindex;
3842 hdr->ifi_flags = dev_get_flags(dev);
3843 hdr->ifi_change = 0;
3845 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3848 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3850 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3851 if (dev->ifindex != dev->iflink)
3852 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3854 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3855 if (protoinfo == NULL)
3856 goto nla_put_failure;
3858 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3860 ci.max_reasm_len = IPV6_MAXPLEN;
3861 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3862 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3863 ci.reachable_time = idev->nd_parms->reachable_time;
3864 ci.retrans_time = idev->nd_parms->retrans_time;
3865 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3867 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3869 goto nla_put_failure;
3870 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3872 /* XXX - MC not implemented */
3874 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3876 goto nla_put_failure;
3877 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3879 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3881 goto nla_put_failure;
3882 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3884 nla_nest_end(skb, protoinfo);
3885 return nlmsg_end(skb, nlh);
3888 nlmsg_cancel(skb, nlh);
3892 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3894 struct net *net = sock_net(skb->sk);
3897 struct net_device *dev;
3898 struct inet6_dev *idev;
3899 struct hlist_head *head;
3900 struct hlist_node *node;
3903 s_idx = cb->args[1];
3906 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3908 head = &net->dev_index_head[h];
3909 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3912 idev = __in6_dev_get(dev);
3915 if (inet6_fill_ifinfo(skb, idev,
3916 NETLINK_CB(cb->skb).pid,
3918 RTM_NEWLINK, NLM_F_MULTI) <= 0)
3932 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3934 struct sk_buff *skb;
3935 struct net *net = dev_net(idev->dev);
3938 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
3942 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
3944 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3945 WARN_ON(err == -EMSGSIZE);
3949 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3953 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3956 static inline size_t inet6_prefix_nlmsg_size(void)
3958 return NLMSG_ALIGN(sizeof(struct prefixmsg))
3959 + nla_total_size(sizeof(struct in6_addr))
3960 + nla_total_size(sizeof(struct prefix_cacheinfo));
3963 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3964 struct prefix_info *pinfo, u32 pid, u32 seq,
3965 int event, unsigned int flags)
3967 struct prefixmsg *pmsg;
3968 struct nlmsghdr *nlh;
3969 struct prefix_cacheinfo ci;
3971 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3975 pmsg = nlmsg_data(nlh);
3976 pmsg->prefix_family = AF_INET6;
3977 pmsg->prefix_pad1 = 0;
3978 pmsg->prefix_pad2 = 0;
3979 pmsg->prefix_ifindex = idev->dev->ifindex;
3980 pmsg->prefix_len = pinfo->prefix_len;
3981 pmsg->prefix_type = pinfo->type;
3982 pmsg->prefix_pad3 = 0;
3983 pmsg->prefix_flags = 0;
3985 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3986 if (pinfo->autoconf)
3987 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3989 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3991 ci.preferred_time = ntohl(pinfo->prefered);
3992 ci.valid_time = ntohl(pinfo->valid);
3993 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3995 return nlmsg_end(skb, nlh);
3998 nlmsg_cancel(skb, nlh);
4002 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4003 struct prefix_info *pinfo)
4005 struct sk_buff *skb;
4006 struct net *net = dev_net(idev->dev);
4009 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4013 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4015 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4016 WARN_ON(err == -EMSGSIZE);
4020 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4024 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4027 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4029 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4034 * If the address was optimistic
4035 * we inserted the route at the start of
4036 * our DAD process, so we don't need
4039 if (!(ifp->rt->rt6i_node))
4040 ip6_ins_rt(ifp->rt);
4041 if (ifp->idev->cnf.forwarding)
4042 addrconf_join_anycast(ifp);
4045 if (ifp->idev->cnf.forwarding)
4046 addrconf_leave_anycast(ifp);
4047 addrconf_leave_solict(ifp->idev, &ifp->addr);
4048 dst_hold(&ifp->rt->u.dst);
4049 if (ip6_del_rt(ifp->rt))
4050 dst_free(&ifp->rt->u.dst);
4055 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4058 if (likely(ifp->idev->dead == 0))
4059 __ipv6_ifa_notify(event, ifp);
4060 rcu_read_unlock_bh();
4063 #ifdef CONFIG_SYSCTL
4066 int addrconf_sysctl_forward(ctl_table *ctl, int write,
4067 void __user *buffer, size_t *lenp, loff_t *ppos)
4069 int *valp = ctl->data;
4074 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4077 ret = addrconf_fixup_forwarding(ctl, valp, val);
4083 static void dev_disable_change(struct inet6_dev *idev)
4085 if (!idev || !idev->dev)
4088 if (idev->cnf.disable_ipv6)
4089 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4091 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4094 static void addrconf_disable_change(struct net *net, __s32 newf)
4096 struct net_device *dev;
4097 struct inet6_dev *idev;
4100 for_each_netdev_rcu(net, dev) {
4101 idev = __in6_dev_get(dev);
4103 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4104 idev->cnf.disable_ipv6 = newf;
4106 dev_disable_change(idev);
4112 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int old)
4116 net = (struct net *)table->extra2;
4118 if (p == &net->ipv6.devconf_dflt->disable_ipv6)
4121 if (!rtnl_trylock()) {
4122 /* Restore the original values before restarting */
4124 return restart_syscall();
4127 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4128 __s32 newf = net->ipv6.devconf_all->disable_ipv6;
4129 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4130 addrconf_disable_change(net, newf);
4131 } else if ((!*p) ^ (!old))
4132 dev_disable_change((struct inet6_dev *)table->extra1);
4139 int addrconf_sysctl_disable(ctl_table *ctl, int write,
4140 void __user *buffer, size_t *lenp, loff_t *ppos)
4142 int *valp = ctl->data;
4147 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4150 ret = addrconf_disable_ipv6(ctl, valp, val);
4156 static struct addrconf_sysctl_table
4158 struct ctl_table_header *sysctl_header;
4159 ctl_table addrconf_vars[DEVCONF_MAX+1];
4161 } addrconf_sysctl __read_mostly = {
4162 .sysctl_header = NULL,
4165 .procname = "forwarding",
4166 .data = &ipv6_devconf.forwarding,
4167 .maxlen = sizeof(int),
4169 .proc_handler = addrconf_sysctl_forward,
4172 .procname = "hop_limit",
4173 .data = &ipv6_devconf.hop_limit,
4174 .maxlen = sizeof(int),
4176 .proc_handler = proc_dointvec,
4180 .data = &ipv6_devconf.mtu6,
4181 .maxlen = sizeof(int),
4183 .proc_handler = proc_dointvec,
4186 .procname = "accept_ra",
4187 .data = &ipv6_devconf.accept_ra,
4188 .maxlen = sizeof(int),
4190 .proc_handler = proc_dointvec,
4193 .procname = "accept_redirects",
4194 .data = &ipv6_devconf.accept_redirects,
4195 .maxlen = sizeof(int),
4197 .proc_handler = proc_dointvec,
4200 .procname = "autoconf",
4201 .data = &ipv6_devconf.autoconf,
4202 .maxlen = sizeof(int),
4204 .proc_handler = proc_dointvec,
4207 .procname = "dad_transmits",
4208 .data = &ipv6_devconf.dad_transmits,
4209 .maxlen = sizeof(int),
4211 .proc_handler = proc_dointvec,
4214 .procname = "router_solicitations",
4215 .data = &ipv6_devconf.rtr_solicits,
4216 .maxlen = sizeof(int),
4218 .proc_handler = proc_dointvec,
4221 .procname = "router_solicitation_interval",
4222 .data = &ipv6_devconf.rtr_solicit_interval,
4223 .maxlen = sizeof(int),
4225 .proc_handler = proc_dointvec_jiffies,
4228 .procname = "router_solicitation_delay",
4229 .data = &ipv6_devconf.rtr_solicit_delay,
4230 .maxlen = sizeof(int),
4232 .proc_handler = proc_dointvec_jiffies,
4235 .procname = "force_mld_version",
4236 .data = &ipv6_devconf.force_mld_version,
4237 .maxlen = sizeof(int),
4239 .proc_handler = proc_dointvec,
4241 #ifdef CONFIG_IPV6_PRIVACY
4243 .procname = "use_tempaddr",
4244 .data = &ipv6_devconf.use_tempaddr,
4245 .maxlen = sizeof(int),
4247 .proc_handler = proc_dointvec,
4250 .procname = "temp_valid_lft",
4251 .data = &ipv6_devconf.temp_valid_lft,
4252 .maxlen = sizeof(int),
4254 .proc_handler = proc_dointvec,
4257 .procname = "temp_prefered_lft",
4258 .data = &ipv6_devconf.temp_prefered_lft,
4259 .maxlen = sizeof(int),
4261 .proc_handler = proc_dointvec,
4264 .procname = "regen_max_retry",
4265 .data = &ipv6_devconf.regen_max_retry,
4266 .maxlen = sizeof(int),
4268 .proc_handler = proc_dointvec,
4271 .procname = "max_desync_factor",
4272 .data = &ipv6_devconf.max_desync_factor,
4273 .maxlen = sizeof(int),
4275 .proc_handler = proc_dointvec,
4279 .procname = "max_addresses",
4280 .data = &ipv6_devconf.max_addresses,
4281 .maxlen = sizeof(int),
4283 .proc_handler = proc_dointvec,
4286 .procname = "accept_ra_defrtr",
4287 .data = &ipv6_devconf.accept_ra_defrtr,
4288 .maxlen = sizeof(int),
4290 .proc_handler = proc_dointvec,
4293 .procname = "accept_ra_pinfo",
4294 .data = &ipv6_devconf.accept_ra_pinfo,
4295 .maxlen = sizeof(int),
4297 .proc_handler = proc_dointvec,
4299 #ifdef CONFIG_IPV6_ROUTER_PREF
4301 .procname = "accept_ra_rtr_pref",
4302 .data = &ipv6_devconf.accept_ra_rtr_pref,
4303 .maxlen = sizeof(int),
4305 .proc_handler = proc_dointvec,
4308 .procname = "router_probe_interval",
4309 .data = &ipv6_devconf.rtr_probe_interval,
4310 .maxlen = sizeof(int),
4312 .proc_handler = proc_dointvec_jiffies,
4314 #ifdef CONFIG_IPV6_ROUTE_INFO
4316 .procname = "accept_ra_rt_info_max_plen",
4317 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4318 .maxlen = sizeof(int),
4320 .proc_handler = proc_dointvec,
4325 .procname = "proxy_ndp",
4326 .data = &ipv6_devconf.proxy_ndp,
4327 .maxlen = sizeof(int),
4329 .proc_handler = proc_dointvec,
4332 .procname = "accept_source_route",
4333 .data = &ipv6_devconf.accept_source_route,
4334 .maxlen = sizeof(int),
4336 .proc_handler = proc_dointvec,
4338 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4340 .procname = "optimistic_dad",
4341 .data = &ipv6_devconf.optimistic_dad,
4342 .maxlen = sizeof(int),
4344 .proc_handler = proc_dointvec,
4348 #ifdef CONFIG_IPV6_MROUTE
4350 .procname = "mc_forwarding",
4351 .data = &ipv6_devconf.mc_forwarding,
4352 .maxlen = sizeof(int),
4354 .proc_handler = proc_dointvec,
4358 .procname = "disable_ipv6",
4359 .data = &ipv6_devconf.disable_ipv6,
4360 .maxlen = sizeof(int),
4362 .proc_handler = addrconf_sysctl_disable,
4365 .procname = "accept_dad",
4366 .data = &ipv6_devconf.accept_dad,
4367 .maxlen = sizeof(int),
4369 .proc_handler = proc_dointvec,
4372 .procname = "force_tllao",
4373 .data = &ipv6_devconf.force_tllao,
4374 .maxlen = sizeof(int),
4376 .proc_handler = proc_dointvec
4384 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4385 struct inet6_dev *idev, struct ipv6_devconf *p)
4388 struct addrconf_sysctl_table *t;
4390 #define ADDRCONF_CTL_PATH_DEV 3
4392 struct ctl_path addrconf_ctl_path[] = {
4393 { .procname = "net", },
4394 { .procname = "ipv6", },
4395 { .procname = "conf", },
4396 { /* to be set */ },
4401 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4405 for (i = 0; t->addrconf_vars[i].data; i++) {
4406 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
4407 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4408 t->addrconf_vars[i].extra2 = net;
4412 * Make a copy of dev_name, because '.procname' is regarded as const
4413 * by sysctl and we wouldn't want anyone to change it under our feet
4414 * (see SIOCSIFNAME).
4416 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4420 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4422 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4424 if (t->sysctl_header == NULL)
4438 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4440 struct addrconf_sysctl_table *t;
4442 if (p->sysctl == NULL)
4447 unregister_sysctl_table(t->sysctl_header);
4452 static void addrconf_sysctl_register(struct inet6_dev *idev)
4454 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
4455 &ndisc_ifinfo_sysctl_change);
4456 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4460 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4462 __addrconf_sysctl_unregister(&idev->cnf);
4463 neigh_sysctl_unregister(idev->nd_parms);
4469 static int __net_init addrconf_init_net(struct net *net)
4472 struct ipv6_devconf *all, *dflt;
4475 all = &ipv6_devconf;
4476 dflt = &ipv6_devconf_dflt;
4478 if (!net_eq(net, &init_net)) {
4479 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4483 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4485 goto err_alloc_dflt;
4487 /* these will be inherited by all namespaces */
4488 dflt->autoconf = ipv6_defaults.autoconf;
4489 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
4492 net->ipv6.devconf_all = all;
4493 net->ipv6.devconf_dflt = dflt;
4495 #ifdef CONFIG_SYSCTL
4496 err = __addrconf_sysctl_register(net, "all", NULL, all);
4500 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
4506 #ifdef CONFIG_SYSCTL
4508 __addrconf_sysctl_unregister(all);
4518 static void __net_exit addrconf_exit_net(struct net *net)
4520 #ifdef CONFIG_SYSCTL
4521 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4522 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4524 if (!net_eq(net, &init_net)) {
4525 kfree(net->ipv6.devconf_dflt);
4526 kfree(net->ipv6.devconf_all);
4530 static struct pernet_operations addrconf_ops = {
4531 .init = addrconf_init_net,
4532 .exit = addrconf_exit_net,
4539 int register_inet6addr_notifier(struct notifier_block *nb)
4541 return atomic_notifier_chain_register(&inet6addr_chain, nb);
4543 EXPORT_SYMBOL(register_inet6addr_notifier);
4545 int unregister_inet6addr_notifier(struct notifier_block *nb)
4547 return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
4549 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4552 * Init / cleanup code
4555 int __init addrconf_init(void)
4559 err = ipv6_addr_label_init();
4561 printk(KERN_CRIT "IPv6 Addrconf:"
4562 " cannot initialize default policy table: %d.\n", err);
4566 register_pernet_subsys(&addrconf_ops);
4568 /* The addrconf netdev notifier requires that loopback_dev
4569 * has it's ipv6 private information allocated and setup
4570 * before it can bring up and give link-local addresses
4571 * to other devices which are up.
4573 * Unfortunately, loopback_dev is not necessarily the first
4574 * entry in the global dev_base list of net devices. In fact,
4575 * it is likely to be the very last entry on that list.
4576 * So this causes the notifier registry below to try and
4577 * give link-local addresses to all devices besides loopback_dev
4578 * first, then loopback_dev, which cases all the non-loopback_dev
4579 * devices to fail to get a link-local address.
4581 * So, as a temporary fix, allocate the ipv6 structure for
4582 * loopback_dev first by hand.
4583 * Longer term, all of the dependencies ipv6 has upon the loopback
4584 * device and it being up should be removed.
4587 if (!ipv6_add_dev(init_net.loopback_dev))
4593 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4594 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
4596 register_netdevice_notifier(&ipv6_dev_notf);
4600 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4604 /* Only the first call to __rtnl_register can fail */
4605 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4606 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4607 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4608 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4609 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4611 ipv6_addr_label_rtnl_register();
4615 unregister_netdevice_notifier(&ipv6_dev_notf);
4617 unregister_pernet_subsys(&addrconf_ops);
4622 void addrconf_cleanup(void)
4624 struct net_device *dev;
4627 unregister_netdevice_notifier(&ipv6_dev_notf);
4628 unregister_pernet_subsys(&addrconf_ops);
4632 /* clean dev list */
4633 for_each_netdev(&init_net, dev) {
4634 if (__in6_dev_get(dev) == NULL)
4636 addrconf_ifdown(dev, 1);
4638 addrconf_ifdown(init_net.loopback_dev, 2);
4643 spin_lock_bh(&addrconf_hash_lock);
4644 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4645 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
4646 spin_unlock_bh(&addrconf_hash_lock);
4648 del_timer(&addr_chk_timer);