2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
6 * Pedro Roque <roque@di.fc.ul.pt>
7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
25 * yoshfuji@USAGI : Fixed interval between DAD
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
41 #include <linux/errno.h>
42 #include <linux/types.h>
43 #include <linux/kernel.h>
44 #include <linux/socket.h>
45 #include <linux/sockios.h>
46 #include <linux/net.h>
47 #include <linux/in6.h>
48 #include <linux/netdevice.h>
49 #include <linux/if_addr.h>
50 #include <linux/if_arp.h>
51 #include <linux/if_arcnet.h>
52 #include <linux/if_infiniband.h>
53 #include <linux/route.h>
54 #include <linux/inetdevice.h>
55 #include <linux/init.h>
56 #include <linux/slab.h>
58 #include <linux/sysctl.h>
60 #include <linux/capability.h>
61 #include <linux/delay.h>
62 #include <linux/notifier.h>
63 #include <linux/string.h>
65 #include <net/net_namespace.h>
70 #include <net/protocol.h>
71 #include <net/ndisc.h>
72 #include <net/ip6_route.h>
73 #include <net/addrconf.h>
76 #include <net/netlink.h>
77 #include <net/pkt_sched.h>
78 #include <linux/if_tunnel.h>
79 #include <linux/rtnetlink.h>
81 #ifdef CONFIG_IPV6_PRIVACY
82 #include <linux/random.h>
85 #include <linux/uaccess.h>
86 #include <asm/unaligned.h>
88 #include <linux/proc_fs.h>
89 #include <linux/seq_file.h>
91 /* Set to 3 to get tracing... */
95 #define ADBG(x) printk x
100 #define INFINITY_LIFE_TIME 0xFFFFFFFF
101 #define TIME_DELTA(a, b) ((unsigned long)((long)(a) - (long)(b)))
103 #define ADDRCONF_TIMER_FUZZ_MINUS (HZ > 50 ? HZ/50 : 1)
104 #define ADDRCONF_TIMER_FUZZ (HZ / 4)
105 #define ADDRCONF_TIMER_FUZZ_MAX (HZ)
108 static void addrconf_sysctl_register(struct inet6_dev *idev);
109 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
111 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
115 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
120 #ifdef CONFIG_IPV6_PRIVACY
121 static int __ipv6_regen_rndid(struct inet6_dev *idev);
122 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
123 static void ipv6_regen_rndid(unsigned long data);
126 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
127 static int ipv6_count_addresses(struct inet6_dev *idev);
130 * Configured unicast address hash table
132 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
133 static DEFINE_SPINLOCK(addrconf_hash_lock);
135 static void addrconf_verify(unsigned long);
137 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
138 static DEFINE_SPINLOCK(addrconf_verify_lock);
140 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
141 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
143 static void addrconf_type_change(struct net_device *dev,
144 unsigned long event);
145 static int addrconf_ifdown(struct net_device *dev, int how);
147 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
148 static void addrconf_dad_timer(unsigned long data);
149 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
150 static void addrconf_dad_run(struct inet6_dev *idev);
151 static void addrconf_rs_timer(unsigned long data);
152 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
153 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
155 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
156 struct prefix_info *pinfo);
157 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
158 struct net_device *dev);
160 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
162 static struct ipv6_devconf ipv6_devconf __read_mostly = {
164 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
165 .mtu6 = IPV6_MIN_MTU,
167 .accept_redirects = 1,
169 .force_mld_version = 0,
171 .rtr_solicits = MAX_RTR_SOLICITATIONS,
172 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
173 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
174 #ifdef CONFIG_IPV6_PRIVACY
176 .temp_valid_lft = TEMP_VALID_LIFETIME,
177 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
178 .regen_max_retry = REGEN_MAX_RETRY,
179 .max_desync_factor = MAX_DESYNC_FACTOR,
181 .max_addresses = IPV6_MAX_ADDRESSES,
182 .accept_ra_defrtr = 1,
183 .accept_ra_pinfo = 1,
184 #ifdef CONFIG_IPV6_ROUTER_PREF
185 .accept_ra_rtr_pref = 1,
186 .rtr_probe_interval = 60 * HZ,
187 #ifdef CONFIG_IPV6_ROUTE_INFO
188 .accept_ra_rt_info_max_plen = 0,
192 .accept_source_route = 0, /* we do not accept RH0 by default. */
197 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
199 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
200 .mtu6 = IPV6_MIN_MTU,
202 .accept_redirects = 1,
205 .rtr_solicits = MAX_RTR_SOLICITATIONS,
206 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
207 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
208 #ifdef CONFIG_IPV6_PRIVACY
210 .temp_valid_lft = TEMP_VALID_LIFETIME,
211 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
212 .regen_max_retry = REGEN_MAX_RETRY,
213 .max_desync_factor = MAX_DESYNC_FACTOR,
215 .max_addresses = IPV6_MAX_ADDRESSES,
216 .accept_ra_defrtr = 1,
217 .accept_ra_pinfo = 1,
218 #ifdef CONFIG_IPV6_ROUTER_PREF
219 .accept_ra_rtr_pref = 1,
220 .rtr_probe_interval = 60 * HZ,
221 #ifdef CONFIG_IPV6_ROUTE_INFO
222 .accept_ra_rt_info_max_plen = 0,
226 .accept_source_route = 0, /* we do not accept RH0 by default. */
231 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
232 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
233 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
234 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
235 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
237 /* Check if a valid qdisc is available */
238 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
240 return !qdisc_tx_is_noop(dev);
243 /* Check if a route is valid prefix route */
244 static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
246 return ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0);
249 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
251 if (del_timer(&ifp->timer))
255 enum addrconf_timer_t {
261 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
262 enum addrconf_timer_t what,
265 if (!del_timer(&ifp->timer))
270 ifp->timer.function = addrconf_dad_timer;
273 ifp->timer.function = addrconf_rs_timer;
278 ifp->timer.expires = jiffies + when;
279 add_timer(&ifp->timer);
282 static int snmp6_alloc_dev(struct inet6_dev *idev)
284 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
285 sizeof(struct ipstats_mib),
286 __alignof__(struct ipstats_mib)) < 0)
288 if (snmp_mib_init((void __percpu **)idev->stats.icmpv6,
289 sizeof(struct icmpv6_mib),
290 __alignof__(struct icmpv6_mib)) < 0)
292 if (snmp_mib_init((void __percpu **)idev->stats.icmpv6msg,
293 sizeof(struct icmpv6msg_mib),
294 __alignof__(struct icmpv6msg_mib)) < 0)
300 snmp_mib_free((void __percpu **)idev->stats.icmpv6);
302 snmp_mib_free((void __percpu **)idev->stats.ipv6);
307 static void snmp6_free_dev(struct inet6_dev *idev)
309 snmp_mib_free((void __percpu **)idev->stats.icmpv6msg);
310 snmp_mib_free((void __percpu **)idev->stats.icmpv6);
311 snmp_mib_free((void __percpu **)idev->stats.ipv6);
314 /* Nobody refers to this device, we may destroy it. */
316 static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
318 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
322 void in6_dev_finish_destroy(struct inet6_dev *idev)
324 struct net_device *dev = idev->dev;
326 WARN_ON(!list_empty(&idev->addr_list));
327 WARN_ON(idev->mc_list != NULL);
329 #ifdef NET_REFCNT_DEBUG
330 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
334 pr_warning("Freeing alive inet6 device %p\n", idev);
337 snmp6_free_dev(idev);
338 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
341 EXPORT_SYMBOL(in6_dev_finish_destroy);
343 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
345 struct inet6_dev *ndev;
349 if (dev->mtu < IPV6_MIN_MTU)
352 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
357 rwlock_init(&ndev->lock);
359 INIT_LIST_HEAD(&ndev->addr_list);
361 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
362 ndev->cnf.mtu6 = dev->mtu;
363 ndev->cnf.sysctl = NULL;
364 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
365 if (ndev->nd_parms == NULL) {
369 if (ndev->cnf.forwarding)
370 dev_disable_lro(dev);
371 /* We refer to the device */
374 if (snmp6_alloc_dev(ndev) < 0) {
376 "%s(): cannot allocate memory for statistics; dev=%s.\n",
377 __func__, dev->name));
378 neigh_parms_release(&nd_tbl, ndev->nd_parms);
380 in6_dev_finish_destroy(ndev);
384 if (snmp6_register_dev(ndev) < 0) {
386 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
387 __func__, dev->name));
388 neigh_parms_release(&nd_tbl, ndev->nd_parms);
390 in6_dev_finish_destroy(ndev);
394 /* One reference from device. We must do this before
395 * we invoke __ipv6_regen_rndid().
399 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
400 ndev->cnf.accept_dad = -1;
402 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
403 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
405 "%s: Disabled Multicast RS\n",
407 ndev->cnf.rtr_solicits = 0;
411 #ifdef CONFIG_IPV6_PRIVACY
412 INIT_LIST_HEAD(&ndev->tempaddr_list);
413 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
414 if ((dev->flags&IFF_LOOPBACK) ||
415 dev->type == ARPHRD_TUNNEL ||
416 dev->type == ARPHRD_TUNNEL6 ||
417 dev->type == ARPHRD_SIT ||
418 dev->type == ARPHRD_NONE) {
420 "%s: Disabled Privacy Extensions\n",
422 ndev->cnf.use_tempaddr = -1;
425 ipv6_regen_rndid((unsigned long) ndev);
429 if (netif_running(dev) && addrconf_qdisc_ok(dev))
430 ndev->if_flags |= IF_READY;
432 ipv6_mc_init_dev(ndev);
433 ndev->tstamp = jiffies;
434 addrconf_sysctl_register(ndev);
435 /* protected by rtnl_lock */
436 rcu_assign_pointer(dev->ip6_ptr, ndev);
438 /* Join all-node multicast group */
439 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
444 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
446 struct inet6_dev *idev;
450 idev = __in6_dev_get(dev);
452 idev = ipv6_add_dev(dev);
457 if (dev->flags&IFF_UP)
463 static void dev_forward_change(struct inet6_dev *idev)
465 struct net_device *dev;
466 struct inet6_ifaddr *ifa;
471 if (idev->cnf.forwarding)
472 dev_disable_lro(dev);
473 if (dev && (dev->flags & IFF_MULTICAST)) {
474 if (idev->cnf.forwarding)
475 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
477 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
480 list_for_each_entry(ifa, &idev->addr_list, if_list) {
481 if (ifa->flags&IFA_F_TENTATIVE)
483 if (idev->cnf.forwarding)
484 addrconf_join_anycast(ifa);
486 addrconf_leave_anycast(ifa);
491 static void addrconf_forward_change(struct net *net, __s32 newf)
493 struct net_device *dev;
494 struct inet6_dev *idev;
497 for_each_netdev_rcu(net, dev) {
498 idev = __in6_dev_get(dev);
500 int changed = (!idev->cnf.forwarding) ^ (!newf);
501 idev->cnf.forwarding = newf;
503 dev_forward_change(idev);
509 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
513 net = (struct net *)table->extra2;
514 if (p == &net->ipv6.devconf_dflt->forwarding)
517 if (!rtnl_trylock()) {
518 /* Restore the original values before restarting */
520 return restart_syscall();
523 if (p == &net->ipv6.devconf_all->forwarding) {
524 __s32 newf = net->ipv6.devconf_all->forwarding;
525 net->ipv6.devconf_dflt->forwarding = newf;
526 addrconf_forward_change(net, newf);
527 } else if ((!*p) ^ (!old))
528 dev_forward_change((struct inet6_dev *)table->extra1);
532 rt6_purge_dflt_routers(net);
537 static void inet6_ifa_finish_destroy_rcu(struct rcu_head *head)
539 struct inet6_ifaddr *ifp = container_of(head, struct inet6_ifaddr, rcu);
543 /* Nobody refers to this ifaddr, destroy it */
544 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
546 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
548 #ifdef NET_REFCNT_DEBUG
549 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
552 in6_dev_put(ifp->idev);
554 if (del_timer(&ifp->timer))
555 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
557 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
558 pr_warning("Freeing alive inet6 address %p\n", ifp);
561 dst_release(&ifp->rt->dst);
563 call_rcu(&ifp->rcu, inet6_ifa_finish_destroy_rcu);
567 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
570 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
573 * Each device address list is sorted in order of scope -
574 * global before linklocal.
576 list_for_each(p, &idev->addr_list) {
577 struct inet6_ifaddr *ifa
578 = list_entry(p, struct inet6_ifaddr, if_list);
579 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
583 list_add_tail(&ifp->if_list, p);
586 static u32 ipv6_addr_hash(const struct in6_addr *addr)
589 * We perform the hash function over the last 64 bits of the address
590 * This will include the IEEE address token on links that support it.
592 return jhash_2words((__force u32)addr->s6_addr32[2],
593 (__force u32)addr->s6_addr32[3], 0)
594 & (IN6_ADDR_HSIZE - 1);
597 /* On success it returns ifp with increased reference count */
599 static struct inet6_ifaddr *
600 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
601 int scope, u32 flags)
603 struct inet6_ifaddr *ifa = NULL;
607 int addr_type = ipv6_addr_type(addr);
609 if (addr_type == IPV6_ADDR_ANY ||
610 addr_type & IPV6_ADDR_MULTICAST ||
611 (!(idev->dev->flags & IFF_LOOPBACK) &&
612 addr_type & IPV6_ADDR_LOOPBACK))
613 return ERR_PTR(-EADDRNOTAVAIL);
617 err = -ENODEV; /*XXX*/
621 if (idev->cnf.disable_ipv6) {
626 spin_lock(&addrconf_hash_lock);
628 /* Ignore adding duplicate addresses on an interface */
629 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
630 ADBG(("ipv6_add_addr: already assigned\n"));
635 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
638 ADBG(("ipv6_add_addr: malloc failed\n"));
643 rt = addrconf_dst_alloc(idev, addr, 0);
649 ipv6_addr_copy(&ifa->addr, addr);
651 spin_lock_init(&ifa->lock);
652 spin_lock_init(&ifa->state_lock);
653 init_timer(&ifa->timer);
654 INIT_HLIST_NODE(&ifa->addr_lst);
655 ifa->timer.data = (unsigned long) ifa;
657 ifa->prefix_len = pfxlen;
658 ifa->flags = flags | IFA_F_TENTATIVE;
659 ifa->cstamp = ifa->tstamp = jiffies;
664 * part one of RFC 4429, section 3.3
665 * We should not configure an address as
666 * optimistic if we do not yet know the link
667 * layer address of our nexhop router
670 if (rt->rt6i_nexthop == NULL)
671 ifa->flags &= ~IFA_F_OPTIMISTIC;
678 /* Add to big hash table */
679 hash = ipv6_addr_hash(addr);
681 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
682 spin_unlock(&addrconf_hash_lock);
684 write_lock(&idev->lock);
685 /* Add to inet6_dev unicast addr list. */
686 ipv6_link_dev_addr(idev, ifa);
688 #ifdef CONFIG_IPV6_PRIVACY
689 if (ifa->flags&IFA_F_TEMPORARY) {
690 list_add(&ifa->tmp_list, &idev->tempaddr_list);
696 write_unlock(&idev->lock);
698 rcu_read_unlock_bh();
700 if (likely(err == 0))
701 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
709 spin_unlock(&addrconf_hash_lock);
713 /* This function wants to get referenced ifp and releases it before return */
715 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
717 struct inet6_ifaddr *ifa, *ifn;
718 struct inet6_dev *idev = ifp->idev;
721 int deleted = 0, onlink = 0;
722 unsigned long expires = jiffies;
724 hash = ipv6_addr_hash(&ifp->addr);
726 spin_lock_bh(&ifp->state_lock);
728 ifp->state = INET6_IFADDR_STATE_DEAD;
729 spin_unlock_bh(&ifp->state_lock);
731 if (state == INET6_IFADDR_STATE_DEAD)
734 spin_lock_bh(&addrconf_hash_lock);
735 hlist_del_init_rcu(&ifp->addr_lst);
736 spin_unlock_bh(&addrconf_hash_lock);
738 write_lock_bh(&idev->lock);
739 #ifdef CONFIG_IPV6_PRIVACY
740 if (ifp->flags&IFA_F_TEMPORARY) {
741 list_del(&ifp->tmp_list);
743 in6_ifa_put(ifp->ifpub);
750 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
752 list_del_init(&ifp->if_list);
755 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
759 } else if (ifp->flags & IFA_F_PERMANENT) {
760 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
762 if (ifa->flags & IFA_F_PERMANENT) {
767 unsigned long lifetime;
772 spin_lock(&ifa->lock);
774 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
776 * Note: Because this address is
777 * not permanent, lifetime <
778 * LONG_MAX / HZ here.
780 if (time_before(expires,
781 ifa->tstamp + lifetime * HZ))
782 expires = ifa->tstamp + lifetime * HZ;
783 spin_unlock(&ifa->lock);
788 write_unlock_bh(&idev->lock);
790 addrconf_del_timer(ifp);
792 ipv6_ifa_notify(RTM_DELADDR, ifp);
794 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
797 * Purge or update corresponding prefix
799 * 1) we don't purge prefix here if address was not permanent.
800 * prefix is managed by its own lifetime.
801 * 2) if there're no addresses, delete prefix.
802 * 3) if there're still other permanent address(es),
803 * corresponding prefix is still permanent.
804 * 4) otherwise, update prefix lifetime to the
805 * longest valid lifetime among the corresponding
806 * addresses on the device.
807 * Note: subsequent RA will update lifetime.
811 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
812 struct in6_addr prefix;
814 struct net *net = dev_net(ifp->idev->dev);
815 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
816 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
818 if (rt && addrconf_is_prefix_route(rt)) {
822 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
823 rt->rt6i_expires = expires;
824 rt->rt6i_flags |= RTF_EXPIRES;
827 dst_release(&rt->dst);
834 #ifdef CONFIG_IPV6_PRIVACY
835 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
837 struct inet6_dev *idev = ifp->idev;
838 struct in6_addr addr, *tmpaddr;
839 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
840 unsigned long regen_advance;
846 write_lock(&idev->lock);
848 spin_lock_bh(&ift->lock);
849 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
850 spin_unlock_bh(&ift->lock);
857 if (idev->cnf.use_tempaddr <= 0) {
858 write_unlock(&idev->lock);
860 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
865 spin_lock_bh(&ifp->lock);
866 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
867 idev->cnf.use_tempaddr = -1; /*XXX*/
868 spin_unlock_bh(&ifp->lock);
869 write_unlock(&idev->lock);
871 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
877 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
878 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
879 spin_unlock_bh(&ifp->lock);
880 write_unlock(&idev->lock);
882 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
888 memcpy(&addr.s6_addr[8], idev->rndid, 8);
889 tmp_valid_lft = min_t(__u32,
891 idev->cnf.temp_valid_lft);
892 tmp_prefered_lft = min_t(__u32,
894 idev->cnf.temp_prefered_lft -
895 idev->cnf.max_desync_factor);
896 tmp_plen = ifp->prefix_len;
897 max_addresses = idev->cnf.max_addresses;
898 tmp_cstamp = ifp->cstamp;
899 tmp_tstamp = ifp->tstamp;
900 spin_unlock_bh(&ifp->lock);
902 regen_advance = idev->cnf.regen_max_retry *
903 idev->cnf.dad_transmits *
904 idev->nd_parms->retrans_time / HZ;
905 write_unlock(&idev->lock);
907 /* A temporary address is created only if this calculated Preferred
908 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
909 * an implementation must not create a temporary address with a zero
910 * Preferred Lifetime.
912 if (tmp_prefered_lft <= regen_advance) {
919 addr_flags = IFA_F_TEMPORARY;
920 /* set in addrconf_prefix_rcv() */
921 if (ifp->flags & IFA_F_OPTIMISTIC)
922 addr_flags |= IFA_F_OPTIMISTIC;
924 ift = !max_addresses ||
925 ipv6_count_addresses(idev) < max_addresses ?
926 ipv6_add_addr(idev, &addr, tmp_plen,
927 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
929 if (!ift || IS_ERR(ift)) {
933 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
935 write_lock(&idev->lock);
939 spin_lock_bh(&ift->lock);
941 ift->valid_lft = tmp_valid_lft;
942 ift->prefered_lft = tmp_prefered_lft;
943 ift->cstamp = tmp_cstamp;
944 ift->tstamp = tmp_tstamp;
945 spin_unlock_bh(&ift->lock);
947 addrconf_dad_start(ift, 0);
956 * Choose an appropriate source address (RFC3484)
959 IPV6_SADDR_RULE_INIT = 0,
960 IPV6_SADDR_RULE_LOCAL,
961 IPV6_SADDR_RULE_SCOPE,
962 IPV6_SADDR_RULE_PREFERRED,
963 #ifdef CONFIG_IPV6_MIP6
967 IPV6_SADDR_RULE_LABEL,
968 #ifdef CONFIG_IPV6_PRIVACY
969 IPV6_SADDR_RULE_PRIVACY,
971 IPV6_SADDR_RULE_ORCHID,
972 IPV6_SADDR_RULE_PREFIX,
976 struct ipv6_saddr_score {
979 struct inet6_ifaddr *ifa;
980 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
985 struct ipv6_saddr_dst {
986 const struct in6_addr *addr;
993 static inline int ipv6_saddr_preferred(int type)
995 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1000 static int ipv6_get_saddr_eval(struct net *net,
1001 struct ipv6_saddr_score *score,
1002 struct ipv6_saddr_dst *dst,
1007 if (i <= score->rule) {
1009 case IPV6_SADDR_RULE_SCOPE:
1010 ret = score->scopedist;
1012 case IPV6_SADDR_RULE_PREFIX:
1013 ret = score->matchlen;
1016 ret = !!test_bit(i, score->scorebits);
1022 case IPV6_SADDR_RULE_INIT:
1023 /* Rule 0: remember if hiscore is not ready yet */
1026 case IPV6_SADDR_RULE_LOCAL:
1027 /* Rule 1: Prefer same address */
1028 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1030 case IPV6_SADDR_RULE_SCOPE:
1031 /* Rule 2: Prefer appropriate scope
1036 * ---+--+-+---> scope
1038 * | d is scope of the destination.
1040 * | \ <- smaller scope is better if
1041 * B-15 | \ if scope is enough for destinaion.
1042 * | ret = B - scope (-1 <= scope >= d <= 15).
1044 * |/ <- greater is better
1045 * -C / if scope is not enough for destination.
1046 * /| ret = scope - C (-1 <= d < scope <= 15).
1048 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1049 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1050 * Assume B = 0 and we get C > 29.
1052 ret = __ipv6_addr_src_scope(score->addr_type);
1053 if (ret >= dst->scope)
1056 ret -= 128; /* 30 is enough */
1057 score->scopedist = ret;
1059 case IPV6_SADDR_RULE_PREFERRED:
1060 /* Rule 3: Avoid deprecated and optimistic addresses */
1061 ret = ipv6_saddr_preferred(score->addr_type) ||
1062 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1064 #ifdef CONFIG_IPV6_MIP6
1065 case IPV6_SADDR_RULE_HOA:
1067 /* Rule 4: Prefer home address */
1068 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1069 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1073 case IPV6_SADDR_RULE_OIF:
1074 /* Rule 5: Prefer outgoing interface */
1075 ret = (!dst->ifindex ||
1076 dst->ifindex == score->ifa->idev->dev->ifindex);
1078 case IPV6_SADDR_RULE_LABEL:
1079 /* Rule 6: Prefer matching label */
1080 ret = ipv6_addr_label(net,
1081 &score->ifa->addr, score->addr_type,
1082 score->ifa->idev->dev->ifindex) == dst->label;
1084 #ifdef CONFIG_IPV6_PRIVACY
1085 case IPV6_SADDR_RULE_PRIVACY:
1087 /* Rule 7: Prefer public address
1088 * Note: prefer temprary address if use_tempaddr >= 2
1090 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1091 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1092 score->ifa->idev->cnf.use_tempaddr >= 2;
1093 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1097 case IPV6_SADDR_RULE_ORCHID:
1098 /* Rule 8-: Prefer ORCHID vs ORCHID or
1099 * non-ORCHID vs non-ORCHID
1101 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1102 ipv6_addr_orchid(dst->addr));
1104 case IPV6_SADDR_RULE_PREFIX:
1105 /* Rule 8: Use longest matching prefix */
1106 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1114 __set_bit(i, score->scorebits);
1120 int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
1121 const struct in6_addr *daddr, unsigned int prefs,
1122 struct in6_addr *saddr)
1124 struct ipv6_saddr_score scores[2],
1125 *score = &scores[0], *hiscore = &scores[1];
1126 struct ipv6_saddr_dst dst;
1127 struct net_device *dev;
1130 dst_type = __ipv6_addr_type(daddr);
1132 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1133 dst.scope = __ipv6_addr_src_scope(dst_type);
1134 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1138 hiscore->ifa = NULL;
1142 for_each_netdev_rcu(net, dev) {
1143 struct inet6_dev *idev;
1145 /* Candidate Source Address (section 4)
1146 * - multicast and link-local destination address,
1147 * the set of candidate source address MUST only
1148 * include addresses assigned to interfaces
1149 * belonging to the same link as the outgoing
1151 * (- For site-local destination addresses, the
1152 * set of candidate source addresses MUST only
1153 * include addresses assigned to interfaces
1154 * belonging to the same site as the outgoing
1157 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1158 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1159 dst.ifindex && dev->ifindex != dst.ifindex)
1162 idev = __in6_dev_get(dev);
1166 read_lock_bh(&idev->lock);
1167 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1171 * - Tentative Address (RFC2462 section 5.4)
1172 * - A tentative address is not considered
1173 * "assigned to an interface" in the traditional
1174 * sense, unless it is also flagged as optimistic.
1175 * - Candidate Source Address (section 4)
1176 * - In any case, anycast addresses, multicast
1177 * addresses, and the unspecified address MUST
1178 * NOT be included in a candidate set.
1180 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1181 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1184 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1186 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1187 score->addr_type & IPV6_ADDR_MULTICAST)) {
1188 LIMIT_NETDEBUG(KERN_DEBUG
1189 "ADDRCONF: unspecified / multicast address "
1190 "assigned as unicast address on %s",
1196 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1198 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1199 int minihiscore, miniscore;
1201 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1202 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1204 if (minihiscore > miniscore) {
1205 if (i == IPV6_SADDR_RULE_SCOPE &&
1206 score->scopedist > 0) {
1209 * each remaining entry
1210 * has too small (not enough)
1211 * scope, because ifa entries
1212 * are sorted by their scope
1218 } else if (minihiscore < miniscore) {
1220 in6_ifa_put(hiscore->ifa);
1222 in6_ifa_hold(score->ifa);
1224 swap(hiscore, score);
1226 /* restore our iterator */
1227 score->ifa = hiscore->ifa;
1234 read_unlock_bh(&idev->lock);
1239 return -EADDRNOTAVAIL;
1241 ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1242 in6_ifa_put(hiscore->ifa);
1245 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1247 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1248 unsigned char banned_flags)
1250 struct inet6_dev *idev;
1251 int err = -EADDRNOTAVAIL;
1254 idev = __in6_dev_get(dev);
1256 struct inet6_ifaddr *ifp;
1258 read_lock_bh(&idev->lock);
1259 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1260 if (ifp->scope == IFA_LINK &&
1261 !(ifp->flags & banned_flags)) {
1262 ipv6_addr_copy(addr, &ifp->addr);
1267 read_unlock_bh(&idev->lock);
1273 static int ipv6_count_addresses(struct inet6_dev *idev)
1276 struct inet6_ifaddr *ifp;
1278 read_lock_bh(&idev->lock);
1279 list_for_each_entry(ifp, &idev->addr_list, if_list)
1281 read_unlock_bh(&idev->lock);
1285 int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1286 struct net_device *dev, int strict)
1288 struct inet6_ifaddr *ifp;
1289 struct hlist_node *node;
1290 unsigned int hash = ipv6_addr_hash(addr);
1293 hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1294 if (!net_eq(dev_net(ifp->idev->dev), net))
1296 if (ipv6_addr_equal(&ifp->addr, addr) &&
1297 !(ifp->flags&IFA_F_TENTATIVE) &&
1298 (dev == NULL || ifp->idev->dev == dev ||
1299 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1300 rcu_read_unlock_bh();
1305 rcu_read_unlock_bh();
1308 EXPORT_SYMBOL(ipv6_chk_addr);
1310 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1311 struct net_device *dev)
1313 unsigned int hash = ipv6_addr_hash(addr);
1314 struct inet6_ifaddr *ifp;
1315 struct hlist_node *node;
1317 hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1318 if (!net_eq(dev_net(ifp->idev->dev), net))
1320 if (ipv6_addr_equal(&ifp->addr, addr)) {
1321 if (dev == NULL || ifp->idev->dev == dev)
1328 int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev)
1330 struct inet6_dev *idev;
1331 struct inet6_ifaddr *ifa;
1336 idev = __in6_dev_get(dev);
1338 read_lock_bh(&idev->lock);
1339 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1340 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1345 read_unlock_bh(&idev->lock);
1351 EXPORT_SYMBOL(ipv6_chk_prefix);
1353 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1354 struct net_device *dev, int strict)
1356 struct inet6_ifaddr *ifp, *result = NULL;
1357 unsigned int hash = ipv6_addr_hash(addr);
1358 struct hlist_node *node;
1361 hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1362 if (!net_eq(dev_net(ifp->idev->dev), net))
1364 if (ipv6_addr_equal(&ifp->addr, addr)) {
1365 if (dev == NULL || ifp->idev->dev == dev ||
1366 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1373 rcu_read_unlock_bh();
1378 /* Gets referenced address, destroys ifaddr */
1380 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1382 if (ifp->flags&IFA_F_PERMANENT) {
1383 spin_lock_bh(&ifp->lock);
1384 addrconf_del_timer(ifp);
1385 ifp->flags |= IFA_F_TENTATIVE;
1387 ifp->flags |= IFA_F_DADFAILED;
1388 spin_unlock_bh(&ifp->lock);
1390 ipv6_ifa_notify(0, ifp);
1392 #ifdef CONFIG_IPV6_PRIVACY
1393 } else if (ifp->flags&IFA_F_TEMPORARY) {
1394 struct inet6_ifaddr *ifpub;
1395 spin_lock_bh(&ifp->lock);
1398 in6_ifa_hold(ifpub);
1399 spin_unlock_bh(&ifp->lock);
1400 ipv6_create_tempaddr(ifpub, ifp);
1403 spin_unlock_bh(&ifp->lock);
1411 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1415 spin_lock(&ifp->state_lock);
1416 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1417 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1420 spin_unlock(&ifp->state_lock);
1425 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1427 struct inet6_dev *idev = ifp->idev;
1429 if (addrconf_dad_end(ifp))
1432 if (net_ratelimit())
1433 printk(KERN_INFO "%s: IPv6 duplicate address %pI6c detected!\n",
1434 ifp->idev->dev->name, &ifp->addr);
1436 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1437 struct in6_addr addr;
1439 addr.s6_addr32[0] = htonl(0xfe800000);
1440 addr.s6_addr32[1] = 0;
1442 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1443 ipv6_addr_equal(&ifp->addr, &addr)) {
1444 /* DAD failed for link-local based on MAC address */
1445 idev->cnf.disable_ipv6 = 1;
1447 printk(KERN_INFO "%s: IPv6 being disabled!\n",
1448 ifp->idev->dev->name);
1452 addrconf_dad_stop(ifp, 1);
1455 /* Join to solicited addr multicast group. */
1457 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1459 struct in6_addr maddr;
1461 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1464 addrconf_addr_solict_mult(addr, &maddr);
1465 ipv6_dev_mc_inc(dev, &maddr);
1468 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1470 struct in6_addr maddr;
1472 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1475 addrconf_addr_solict_mult(addr, &maddr);
1476 __ipv6_dev_mc_dec(idev, &maddr);
1479 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1481 struct in6_addr addr;
1482 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1483 if (ipv6_addr_any(&addr))
1485 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1488 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1490 struct in6_addr addr;
1491 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1492 if (ipv6_addr_any(&addr))
1494 __ipv6_dev_ac_dec(ifp->idev, &addr);
1497 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1499 if (dev->addr_len != ETH_ALEN)
1501 memcpy(eui, dev->dev_addr, 3);
1502 memcpy(eui + 5, dev->dev_addr + 3, 3);
1505 * The zSeries OSA network cards can be shared among various
1506 * OS instances, but the OSA cards have only one MAC address.
1507 * This leads to duplicate address conflicts in conjunction
1508 * with IPv6 if more than one instance uses the same card.
1510 * The driver for these cards can deliver a unique 16-bit
1511 * identifier for each instance sharing the same card. It is
1512 * placed instead of 0xFFFE in the interface identifier. The
1513 * "u" bit of the interface identifier is not inverted in this
1514 * case. Hence the resulting interface identifier has local
1515 * scope according to RFC2373.
1518 eui[3] = (dev->dev_id >> 8) & 0xFF;
1519 eui[4] = dev->dev_id & 0xFF;
1528 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1530 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1531 if (dev->addr_len != ARCNET_ALEN)
1534 eui[7] = *(u8*)dev->dev_addr;
1538 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1540 if (dev->addr_len != INFINIBAND_ALEN)
1542 memcpy(eui, dev->dev_addr + 12, 8);
1547 int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1551 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1552 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1553 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1554 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1555 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1556 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1560 memcpy(eui + 4, &addr, 4);
1563 EXPORT_SYMBOL(__ipv6_isatap_ifid);
1565 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1567 if (dev->priv_flags & IFF_ISATAP)
1568 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1572 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1574 switch (dev->type) {
1577 case ARPHRD_IEEE802_TR:
1578 return addrconf_ifid_eui48(eui, dev);
1580 return addrconf_ifid_arcnet(eui, dev);
1581 case ARPHRD_INFINIBAND:
1582 return addrconf_ifid_infiniband(eui, dev);
1584 return addrconf_ifid_sit(eui, dev);
1589 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1592 struct inet6_ifaddr *ifp;
1594 read_lock_bh(&idev->lock);
1595 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1596 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1597 memcpy(eui, ifp->addr.s6_addr+8, 8);
1602 read_unlock_bh(&idev->lock);
1606 #ifdef CONFIG_IPV6_PRIVACY
1607 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1608 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1611 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1612 idev->rndid[0] &= ~0x02;
1615 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1616 * check if generated address is not inappropriate
1618 * - Reserved subnet anycast (RFC 2526)
1619 * 11111101 11....11 1xxxxxxx
1620 * - ISATAP (RFC4214) 6.1
1621 * 00-00-5E-FE-xx-xx-xx-xx
1623 * - XXX: already assigned to an address on the device
1625 if (idev->rndid[0] == 0xfd &&
1626 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1627 (idev->rndid[7]&0x80))
1629 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1630 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1632 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1639 static void ipv6_regen_rndid(unsigned long data)
1641 struct inet6_dev *idev = (struct inet6_dev *) data;
1642 unsigned long expires;
1645 write_lock_bh(&idev->lock);
1650 if (__ipv6_regen_rndid(idev) < 0)
1654 idev->cnf.temp_prefered_lft * HZ -
1655 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1656 idev->cnf.max_desync_factor * HZ;
1657 if (time_before(expires, jiffies)) {
1659 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1664 if (!mod_timer(&idev->regen_timer, expires))
1668 write_unlock_bh(&idev->lock);
1669 rcu_read_unlock_bh();
1673 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1676 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1677 ret = __ipv6_regen_rndid(idev);
1687 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1688 unsigned long expires, u32 flags)
1690 struct fib6_config cfg = {
1691 .fc_table = RT6_TABLE_PREFIX,
1692 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1693 .fc_ifindex = dev->ifindex,
1694 .fc_expires = expires,
1696 .fc_flags = RTF_UP | flags,
1697 .fc_nlinfo.nl_net = dev_net(dev),
1698 .fc_protocol = RTPROT_KERNEL,
1701 ipv6_addr_copy(&cfg.fc_dst, pfx);
1703 /* Prevent useless cloning on PtP SIT.
1704 This thing is done here expecting that the whole
1705 class of non-broadcast devices need not cloning.
1707 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1708 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1709 cfg.fc_flags |= RTF_NONEXTHOP;
1712 ip6_route_add(&cfg);
1715 /* Create "default" multicast route to the interface */
1717 static void addrconf_add_mroute(struct net_device *dev)
1719 struct fib6_config cfg = {
1720 .fc_table = RT6_TABLE_LOCAL,
1721 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1722 .fc_ifindex = dev->ifindex,
1725 .fc_nlinfo.nl_net = dev_net(dev),
1728 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1730 ip6_route_add(&cfg);
1733 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1734 static void sit_route_add(struct net_device *dev)
1736 struct fib6_config cfg = {
1737 .fc_table = RT6_TABLE_MAIN,
1738 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1739 .fc_ifindex = dev->ifindex,
1741 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1742 .fc_nlinfo.nl_net = dev_net(dev),
1745 /* prefix length - 96 bits "::d.d.d.d" */
1746 ip6_route_add(&cfg);
1750 static void addrconf_add_lroute(struct net_device *dev)
1752 struct in6_addr addr;
1754 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1755 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1758 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1760 struct inet6_dev *idev;
1764 idev = ipv6_find_idev(dev);
1766 return ERR_PTR(-ENOBUFS);
1768 if (idev->cnf.disable_ipv6)
1769 return ERR_PTR(-EACCES);
1771 /* Add default multicast route */
1772 addrconf_add_mroute(dev);
1774 /* Add link local route */
1775 addrconf_add_lroute(dev);
1779 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1781 struct prefix_info *pinfo;
1785 struct inet6_dev *in6_dev;
1786 struct net *net = dev_net(dev);
1788 pinfo = (struct prefix_info *) opt;
1790 if (len < sizeof(struct prefix_info)) {
1791 ADBG(("addrconf: prefix option too short\n"));
1796 * Validation checks ([ADDRCONF], page 19)
1799 addr_type = ipv6_addr_type(&pinfo->prefix);
1801 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1804 valid_lft = ntohl(pinfo->valid);
1805 prefered_lft = ntohl(pinfo->prefered);
1807 if (prefered_lft > valid_lft) {
1808 if (net_ratelimit())
1809 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1813 in6_dev = in6_dev_get(dev);
1815 if (in6_dev == NULL) {
1816 if (net_ratelimit())
1817 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1822 * Two things going on here:
1823 * 1) Add routes for on-link prefixes
1824 * 2) Configure prefixes with the auto flag set
1827 if (pinfo->onlink) {
1828 struct rt6_info *rt;
1829 unsigned long rt_expires;
1831 /* Avoid arithmetic overflow. Really, we could
1832 * save rt_expires in seconds, likely valid_lft,
1833 * but it would require division in fib gc, that it
1837 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1839 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
1841 if (addrconf_finite_timeout(rt_expires))
1844 rt = rt6_lookup(net, &pinfo->prefix, NULL,
1847 if (rt && addrconf_is_prefix_route(rt)) {
1848 /* Autoconf prefix route */
1849 if (valid_lft == 0) {
1852 } else if (addrconf_finite_timeout(rt_expires)) {
1854 rt->rt6i_expires = jiffies + rt_expires;
1855 rt->rt6i_flags |= RTF_EXPIRES;
1857 rt->rt6i_flags &= ~RTF_EXPIRES;
1858 rt->rt6i_expires = 0;
1860 } else if (valid_lft) {
1861 clock_t expires = 0;
1862 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1863 if (addrconf_finite_timeout(rt_expires)) {
1865 flags |= RTF_EXPIRES;
1866 expires = jiffies_to_clock_t(rt_expires);
1868 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1869 dev, expires, flags);
1872 dst_release(&rt->dst);
1875 /* Try to figure out our local address for this prefix */
1877 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1878 struct inet6_ifaddr * ifp;
1879 struct in6_addr addr;
1880 int create = 0, update_lft = 0;
1882 if (pinfo->prefix_len == 64) {
1883 memcpy(&addr, &pinfo->prefix, 8);
1884 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1885 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1886 in6_dev_put(in6_dev);
1891 if (net_ratelimit())
1892 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1894 in6_dev_put(in6_dev);
1899 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1901 if (ifp == NULL && valid_lft) {
1902 int max_addresses = in6_dev->cnf.max_addresses;
1905 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1906 if (in6_dev->cnf.optimistic_dad &&
1907 !net->ipv6.devconf_all->forwarding)
1908 addr_flags = IFA_F_OPTIMISTIC;
1911 /* Do not allow to create too much of autoconfigured
1912 * addresses; this would be too easy way to crash kernel.
1914 if (!max_addresses ||
1915 ipv6_count_addresses(in6_dev) < max_addresses)
1916 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1917 addr_type&IPV6_ADDR_SCOPE_MASK,
1920 if (!ifp || IS_ERR(ifp)) {
1921 in6_dev_put(in6_dev);
1925 update_lft = create = 1;
1926 ifp->cstamp = jiffies;
1927 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1933 #ifdef CONFIG_IPV6_PRIVACY
1934 struct inet6_ifaddr *ift;
1938 /* update lifetime (RFC2462 5.5.3 e) */
1939 spin_lock(&ifp->lock);
1941 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1942 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1945 if (!update_lft && stored_lft) {
1946 if (valid_lft > MIN_VALID_LIFETIME ||
1947 valid_lft > stored_lft)
1949 else if (stored_lft <= MIN_VALID_LIFETIME) {
1950 /* valid_lft <= stored_lft is always true */
1952 * RFC 4862 Section 5.5.3e:
1953 * "Note that the preferred lifetime of
1954 * the corresponding address is always
1955 * reset to the Preferred Lifetime in
1956 * the received Prefix Information
1957 * option, regardless of whether the
1958 * valid lifetime is also reset or
1961 * So if the preferred lifetime in
1962 * this advertisement is different
1963 * than what we have stored, but the
1964 * valid lifetime is invalid, just
1965 * reset prefered_lft.
1967 * We must set the valid lifetime
1968 * to the stored lifetime since we'll
1969 * be updating the timestamp below,
1970 * else we'll set it back to the
1973 if (prefered_lft != ifp->prefered_lft) {
1974 valid_lft = stored_lft;
1978 valid_lft = MIN_VALID_LIFETIME;
1979 if (valid_lft < prefered_lft)
1980 prefered_lft = valid_lft;
1986 ifp->valid_lft = valid_lft;
1987 ifp->prefered_lft = prefered_lft;
1990 ifp->flags &= ~IFA_F_DEPRECATED;
1991 spin_unlock(&ifp->lock);
1993 if (!(flags&IFA_F_TENTATIVE))
1994 ipv6_ifa_notify(0, ifp);
1996 spin_unlock(&ifp->lock);
1998 #ifdef CONFIG_IPV6_PRIVACY
1999 read_lock_bh(&in6_dev->lock);
2000 /* update all temporary addresses in the list */
2001 list_for_each_entry(ift, &in6_dev->tempaddr_list, tmp_list) {
2003 * When adjusting the lifetimes of an existing
2004 * temporary address, only lower the lifetimes.
2005 * Implementations must not increase the
2006 * lifetimes of an existing temporary address
2007 * when processing a Prefix Information Option.
2009 if (ifp != ift->ifpub)
2012 spin_lock(&ift->lock);
2014 if (ift->valid_lft > valid_lft &&
2015 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
2016 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
2017 if (ift->prefered_lft > prefered_lft &&
2018 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
2019 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
2020 spin_unlock(&ift->lock);
2021 if (!(flags&IFA_F_TENTATIVE))
2022 ipv6_ifa_notify(0, ift);
2025 if (create && in6_dev->cnf.use_tempaddr > 0) {
2027 * When a new public address is created as described in [ADDRCONF],
2028 * also create a new temporary address.
2030 read_unlock_bh(&in6_dev->lock);
2031 ipv6_create_tempaddr(ifp, NULL);
2033 read_unlock_bh(&in6_dev->lock);
2040 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2041 in6_dev_put(in6_dev);
2045 * Set destination address.
2046 * Special case for SIT interfaces where we create a new "virtual"
2049 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2051 struct in6_ifreq ireq;
2052 struct net_device *dev;
2058 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2061 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2067 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2068 if (dev->type == ARPHRD_SIT) {
2069 const struct net_device_ops *ops = dev->netdev_ops;
2071 struct ip_tunnel_parm p;
2073 err = -EADDRNOTAVAIL;
2074 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2077 memset(&p, 0, sizeof(p));
2078 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2082 p.iph.protocol = IPPROTO_IPV6;
2084 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2086 if (ops->ndo_do_ioctl) {
2087 mm_segment_t oldfs = get_fs();
2090 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2097 dev = __dev_get_by_name(net, p.name);
2100 err = dev_open(dev);
2111 * Manual configuration of address on an interface
2113 static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx,
2114 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2117 struct inet6_ifaddr *ifp;
2118 struct inet6_dev *idev;
2119 struct net_device *dev;
2123 unsigned long timeout;
2130 /* check the lifetime */
2131 if (!valid_lft || prefered_lft > valid_lft)
2134 dev = __dev_get_by_index(net, ifindex);
2138 idev = addrconf_add_dev(dev);
2140 return PTR_ERR(idev);
2142 scope = ipv6_addr_scope(pfx);
2144 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2145 if (addrconf_finite_timeout(timeout)) {
2146 expires = jiffies_to_clock_t(timeout * HZ);
2147 valid_lft = timeout;
2148 flags = RTF_EXPIRES;
2152 ifa_flags |= IFA_F_PERMANENT;
2155 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2156 if (addrconf_finite_timeout(timeout)) {
2158 ifa_flags |= IFA_F_DEPRECATED;
2159 prefered_lft = timeout;
2162 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2165 spin_lock_bh(&ifp->lock);
2166 ifp->valid_lft = valid_lft;
2167 ifp->prefered_lft = prefered_lft;
2168 ifp->tstamp = jiffies;
2169 spin_unlock_bh(&ifp->lock);
2171 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2174 * Note that section 3.1 of RFC 4429 indicates
2175 * that the Optimistic flag should not be set for
2176 * manually configured addresses
2178 addrconf_dad_start(ifp, 0);
2184 return PTR_ERR(ifp);
2187 static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx,
2190 struct inet6_ifaddr *ifp;
2191 struct inet6_dev *idev;
2192 struct net_device *dev;
2197 dev = __dev_get_by_index(net, ifindex);
2201 if ((idev = __in6_dev_get(dev)) == NULL)
2204 read_lock_bh(&idev->lock);
2205 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2206 if (ifp->prefix_len == plen &&
2207 ipv6_addr_equal(pfx, &ifp->addr)) {
2209 read_unlock_bh(&idev->lock);
2213 /* If the last address is deleted administratively,
2214 disable IPv6 on this interface.
2216 if (list_empty(&idev->addr_list))
2217 addrconf_ifdown(idev->dev, 1);
2221 read_unlock_bh(&idev->lock);
2222 return -EADDRNOTAVAIL;
2226 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2228 struct in6_ifreq ireq;
2231 if (!capable(CAP_NET_ADMIN))
2234 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2238 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2239 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2240 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2245 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2247 struct in6_ifreq ireq;
2250 if (!capable(CAP_NET_ADMIN))
2253 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2257 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2258 ireq.ifr6_prefixlen);
2263 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2264 int plen, int scope)
2266 struct inet6_ifaddr *ifp;
2268 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2270 spin_lock_bh(&ifp->lock);
2271 ifp->flags &= ~IFA_F_TENTATIVE;
2272 spin_unlock_bh(&ifp->lock);
2273 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2278 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2279 static void sit_add_v4_addrs(struct inet6_dev *idev)
2281 struct in6_addr addr;
2282 struct net_device *dev;
2283 struct net *net = dev_net(idev->dev);
2288 memset(&addr, 0, sizeof(struct in6_addr));
2289 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2291 if (idev->dev->flags&IFF_POINTOPOINT) {
2292 addr.s6_addr32[0] = htonl(0xfe800000);
2295 scope = IPV6_ADDR_COMPATv4;
2298 if (addr.s6_addr32[3]) {
2299 add_addr(idev, &addr, 128, scope);
2303 for_each_netdev(net, dev) {
2304 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2305 if (in_dev && (dev->flags & IFF_UP)) {
2306 struct in_ifaddr * ifa;
2310 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2313 addr.s6_addr32[3] = ifa->ifa_local;
2315 if (ifa->ifa_scope == RT_SCOPE_LINK)
2317 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2318 if (idev->dev->flags&IFF_POINTOPOINT)
2322 if (idev->dev->flags&IFF_POINTOPOINT)
2327 add_addr(idev, &addr, plen, flag);
2334 static void init_loopback(struct net_device *dev)
2336 struct inet6_dev *idev;
2342 if ((idev = ipv6_find_idev(dev)) == NULL) {
2343 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2347 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2350 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2352 struct inet6_ifaddr * ifp;
2353 u32 addr_flags = IFA_F_PERMANENT;
2355 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2356 if (idev->cnf.optimistic_dad &&
2357 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2358 addr_flags |= IFA_F_OPTIMISTIC;
2362 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2364 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2365 addrconf_dad_start(ifp, 0);
2370 static void addrconf_dev_config(struct net_device *dev)
2372 struct in6_addr addr;
2373 struct inet6_dev * idev;
2377 if ((dev->type != ARPHRD_ETHER) &&
2378 (dev->type != ARPHRD_FDDI) &&
2379 (dev->type != ARPHRD_IEEE802_TR) &&
2380 (dev->type != ARPHRD_ARCNET) &&
2381 (dev->type != ARPHRD_INFINIBAND)) {
2382 /* Alas, we support only Ethernet autoconfiguration. */
2386 idev = addrconf_add_dev(dev);
2390 memset(&addr, 0, sizeof(struct in6_addr));
2391 addr.s6_addr32[0] = htonl(0xFE800000);
2393 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2394 addrconf_add_linklocal(idev, &addr);
2397 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2398 static void addrconf_sit_config(struct net_device *dev)
2400 struct inet6_dev *idev;
2405 * Configure the tunnel with one of our IPv4
2406 * addresses... we should configure all of
2407 * our v4 addrs in the tunnel
2410 if ((idev = ipv6_find_idev(dev)) == NULL) {
2411 printk(KERN_DEBUG "init sit: add_dev failed\n");
2415 if (dev->priv_flags & IFF_ISATAP) {
2416 struct in6_addr addr;
2418 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2419 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2420 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2421 addrconf_add_linklocal(idev, &addr);
2425 sit_add_v4_addrs(idev);
2427 if (dev->flags&IFF_POINTOPOINT) {
2428 addrconf_add_mroute(dev);
2429 addrconf_add_lroute(dev);
2436 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2438 struct in6_addr lladdr;
2440 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2441 addrconf_add_linklocal(idev, &lladdr);
2447 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2449 struct net_device *link_dev;
2450 struct net *net = dev_net(idev->dev);
2452 /* first try to inherit the link-local address from the link device */
2453 if (idev->dev->iflink &&
2454 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2455 if (!ipv6_inherit_linklocal(idev, link_dev))
2458 /* then try to inherit it from any device */
2459 for_each_netdev(net, link_dev) {
2460 if (!ipv6_inherit_linklocal(idev, link_dev))
2463 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2467 * Autoconfigure tunnel with a link-local address so routing protocols,
2468 * DHCPv6, MLD etc. can be run over the virtual link
2471 static void addrconf_ip6_tnl_config(struct net_device *dev)
2473 struct inet6_dev *idev;
2477 idev = addrconf_add_dev(dev);
2479 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2482 ip6_tnl_add_linklocal(idev);
2485 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2488 struct net_device *dev = (struct net_device *) data;
2489 struct inet6_dev *idev = __in6_dev_get(dev);
2490 int run_pending = 0;
2494 case NETDEV_REGISTER:
2495 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2496 idev = ipv6_add_dev(dev);
2498 return notifier_from_errno(-ENOMEM);
2504 if (dev->flags & IFF_SLAVE)
2507 if (event == NETDEV_UP) {
2508 if (!addrconf_qdisc_ok(dev)) {
2509 /* device is not ready yet. */
2511 "ADDRCONF(NETDEV_UP): %s: "
2512 "link is not ready\n",
2517 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2518 idev = ipv6_add_dev(dev);
2521 idev->if_flags |= IF_READY;
2525 if (!addrconf_qdisc_ok(dev)) {
2526 /* device is still not ready. */
2531 if (idev->if_flags & IF_READY)
2532 /* device is already configured. */
2534 idev->if_flags |= IF_READY;
2538 "ADDRCONF(NETDEV_CHANGE): %s: "
2539 "link becomes ready\n",
2545 switch (dev->type) {
2546 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2548 addrconf_sit_config(dev);
2551 case ARPHRD_TUNNEL6:
2552 addrconf_ip6_tnl_config(dev);
2554 case ARPHRD_LOOPBACK:
2559 addrconf_dev_config(dev);
2565 addrconf_dad_run(idev);
2568 * If the MTU changed during the interface down,
2569 * when the interface up, the changed MTU must be
2570 * reflected in the idev as well as routers.
2572 if (idev->cnf.mtu6 != dev->mtu &&
2573 dev->mtu >= IPV6_MIN_MTU) {
2574 rt6_mtu_change(dev, dev->mtu);
2575 idev->cnf.mtu6 = dev->mtu;
2577 idev->tstamp = jiffies;
2578 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2581 * If the changed mtu during down is lower than
2582 * IPV6_MIN_MTU stop IPv6 on this interface.
2584 if (dev->mtu < IPV6_MIN_MTU)
2585 addrconf_ifdown(dev, 1);
2589 case NETDEV_CHANGEMTU:
2590 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2591 rt6_mtu_change(dev, dev->mtu);
2592 idev->cnf.mtu6 = dev->mtu;
2596 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2597 idev = ipv6_add_dev(dev);
2603 * MTU falled under IPV6_MIN_MTU.
2604 * Stop IPv6 on this interface.
2608 case NETDEV_UNREGISTER:
2610 * Remove all addresses from this interface.
2612 addrconf_ifdown(dev, event != NETDEV_DOWN);
2615 case NETDEV_CHANGENAME:
2617 snmp6_unregister_dev(idev);
2618 addrconf_sysctl_unregister(idev);
2619 addrconf_sysctl_register(idev);
2620 err = snmp6_register_dev(idev);
2622 return notifier_from_errno(err);
2626 case NETDEV_PRE_TYPE_CHANGE:
2627 case NETDEV_POST_TYPE_CHANGE:
2628 addrconf_type_change(dev, event);
2636 * addrconf module should be notified of a device going up
2638 static struct notifier_block ipv6_dev_notf = {
2639 .notifier_call = addrconf_notify,
2642 static void addrconf_type_change(struct net_device *dev, unsigned long event)
2644 struct inet6_dev *idev;
2647 idev = __in6_dev_get(dev);
2649 if (event == NETDEV_POST_TYPE_CHANGE)
2650 ipv6_mc_remap(idev);
2651 else if (event == NETDEV_PRE_TYPE_CHANGE)
2652 ipv6_mc_unmap(idev);
2655 static int addrconf_ifdown(struct net_device *dev, int how)
2657 struct net *net = dev_net(dev);
2658 struct inet6_dev *idev;
2659 struct inet6_ifaddr *ifa;
2660 LIST_HEAD(keep_list);
2665 rt6_ifdown(net, dev);
2666 neigh_ifdown(&nd_tbl, dev);
2668 idev = __in6_dev_get(dev);
2673 * Step 1: remove reference to ipv6 device from parent device.
2679 /* protected by rtnl_lock */
2680 rcu_assign_pointer(dev->ip6_ptr, NULL);
2682 /* Step 1.5: remove snmp6 entry */
2683 snmp6_unregister_dev(idev);
2687 write_lock_bh(&idev->lock);
2689 /* Step 2: clear flags for stateless addrconf */
2691 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2693 #ifdef CONFIG_IPV6_PRIVACY
2694 if (how && del_timer(&idev->regen_timer))
2697 /* Step 3: clear tempaddr list */
2698 while (!list_empty(&idev->tempaddr_list)) {
2699 ifa = list_first_entry(&idev->tempaddr_list,
2700 struct inet6_ifaddr, tmp_list);
2701 list_del(&ifa->tmp_list);
2702 write_unlock_bh(&idev->lock);
2703 spin_lock_bh(&ifa->lock);
2706 in6_ifa_put(ifa->ifpub);
2709 spin_unlock_bh(&ifa->lock);
2711 write_lock_bh(&idev->lock);
2715 while (!list_empty(&idev->addr_list)) {
2716 ifa = list_first_entry(&idev->addr_list,
2717 struct inet6_ifaddr, if_list);
2718 addrconf_del_timer(ifa);
2720 /* If just doing link down, and address is permanent
2721 and not link-local, then retain it. */
2723 (ifa->flags&IFA_F_PERMANENT) &&
2724 !(ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL)) {
2725 list_move_tail(&ifa->if_list, &keep_list);
2727 /* If not doing DAD on this address, just keep it. */
2728 if ((dev->flags&(IFF_NOARP|IFF_LOOPBACK)) ||
2729 idev->cnf.accept_dad <= 0 ||
2730 (ifa->flags & IFA_F_NODAD))
2733 /* If it was tentative already, no need to notify */
2734 if (ifa->flags & IFA_F_TENTATIVE)
2737 /* Flag it for later restoration when link comes up */
2738 ifa->flags |= IFA_F_TENTATIVE;
2739 ifa->state = INET6_IFADDR_STATE_DAD;
2741 write_unlock_bh(&idev->lock);
2745 list_del(&ifa->if_list);
2747 /* clear hash table */
2748 spin_lock_bh(&addrconf_hash_lock);
2749 hlist_del_init_rcu(&ifa->addr_lst);
2750 spin_unlock_bh(&addrconf_hash_lock);
2752 write_unlock_bh(&idev->lock);
2753 spin_lock_bh(&ifa->state_lock);
2755 ifa->state = INET6_IFADDR_STATE_DEAD;
2756 spin_unlock_bh(&ifa->state_lock);
2758 if (state == INET6_IFADDR_STATE_DEAD)
2762 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2763 if (ifa->state == INET6_IFADDR_STATE_DEAD)
2764 atomic_notifier_call_chain(&inet6addr_chain,
2770 write_lock_bh(&idev->lock);
2773 list_splice(&keep_list, &idev->addr_list);
2775 write_unlock_bh(&idev->lock);
2777 /* Step 5: Discard multicast list */
2779 ipv6_mc_destroy_dev(idev);
2783 idev->tstamp = jiffies;
2785 /* Last: Shot the device (if unregistered) */
2787 addrconf_sysctl_unregister(idev);
2788 neigh_parms_release(&nd_tbl, idev->nd_parms);
2789 neigh_ifdown(&nd_tbl, dev);
2795 static void addrconf_rs_timer(unsigned long data)
2797 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2798 struct inet6_dev *idev = ifp->idev;
2800 read_lock(&idev->lock);
2801 if (idev->dead || !(idev->if_flags & IF_READY))
2804 if (idev->cnf.forwarding)
2807 /* Announcement received after solicitation was sent */
2808 if (idev->if_flags & IF_RA_RCVD)
2811 spin_lock(&ifp->lock);
2812 if (ifp->probes++ < idev->cnf.rtr_solicits) {
2813 /* The wait after the last probe can be shorter */
2814 addrconf_mod_timer(ifp, AC_RS,
2815 (ifp->probes == idev->cnf.rtr_solicits) ?
2816 idev->cnf.rtr_solicit_delay :
2817 idev->cnf.rtr_solicit_interval);
2818 spin_unlock(&ifp->lock);
2820 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2822 spin_unlock(&ifp->lock);
2824 * Note: we do not support deprecated "all on-link"
2825 * assumption any longer.
2827 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2832 read_unlock(&idev->lock);
2837 * Duplicate Address Detection
2839 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2841 unsigned long rand_num;
2842 struct inet6_dev *idev = ifp->idev;
2844 if (ifp->flags & IFA_F_OPTIMISTIC)
2847 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2849 ifp->probes = idev->cnf.dad_transmits;
2850 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2853 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2855 struct inet6_dev *idev = ifp->idev;
2856 struct net_device *dev = idev->dev;
2858 addrconf_join_solict(dev, &ifp->addr);
2860 net_srandom(ifp->addr.s6_addr32[3]);
2862 read_lock_bh(&idev->lock);
2863 spin_lock(&ifp->lock);
2864 if (ifp->state == INET6_IFADDR_STATE_DEAD)
2867 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2868 idev->cnf.accept_dad < 1 ||
2869 !(ifp->flags&IFA_F_TENTATIVE) ||
2870 ifp->flags & IFA_F_NODAD) {
2871 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2872 spin_unlock(&ifp->lock);
2873 read_unlock_bh(&idev->lock);
2875 addrconf_dad_completed(ifp);
2879 if (!(idev->if_flags & IF_READY)) {
2880 spin_unlock(&ifp->lock);
2881 read_unlock_bh(&idev->lock);
2883 * If the device is not ready:
2884 * - keep it tentative if it is a permanent address.
2885 * - otherwise, kill it.
2888 addrconf_dad_stop(ifp, 0);
2893 * Optimistic nodes can start receiving
2896 if (ifp->flags & IFA_F_OPTIMISTIC)
2897 ip6_ins_rt(ifp->rt);
2899 addrconf_dad_kick(ifp);
2901 spin_unlock(&ifp->lock);
2902 read_unlock_bh(&idev->lock);
2905 static void addrconf_dad_timer(unsigned long data)
2907 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2908 struct inet6_dev *idev = ifp->idev;
2909 struct in6_addr mcaddr;
2911 if (!ifp->probes && addrconf_dad_end(ifp))
2914 read_lock(&idev->lock);
2915 if (idev->dead || !(idev->if_flags & IF_READY)) {
2916 read_unlock(&idev->lock);
2920 spin_lock(&ifp->lock);
2921 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
2922 spin_unlock(&ifp->lock);
2923 read_unlock(&idev->lock);
2927 if (ifp->probes == 0) {
2929 * DAD was successful
2932 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2933 spin_unlock(&ifp->lock);
2934 read_unlock(&idev->lock);
2936 addrconf_dad_completed(ifp);
2942 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2943 spin_unlock(&ifp->lock);
2944 read_unlock(&idev->lock);
2946 /* send a neighbour solicitation for our addr */
2947 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2948 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
2953 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2955 struct net_device *dev = ifp->idev->dev;
2958 * Configure the address for reception. Now it is valid.
2961 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2963 /* If added prefix is link local and forwarding is off,
2964 start sending router solicitations.
2967 if ((ifp->idev->cnf.forwarding == 0 ||
2968 ifp->idev->cnf.forwarding == 2) &&
2969 ifp->idev->cnf.rtr_solicits > 0 &&
2970 (dev->flags&IFF_LOOPBACK) == 0 &&
2971 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2973 * If a host as already performed a random delay
2974 * [...] as part of DAD [...] there is no need
2975 * to delay again before sending the first RS
2977 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2979 spin_lock_bh(&ifp->lock);
2981 ifp->idev->if_flags |= IF_RS_SENT;
2982 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2983 spin_unlock_bh(&ifp->lock);
2987 static void addrconf_dad_run(struct inet6_dev *idev)
2989 struct inet6_ifaddr *ifp;
2991 read_lock_bh(&idev->lock);
2992 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2993 spin_lock(&ifp->lock);
2994 if (ifp->flags & IFA_F_TENTATIVE &&
2995 ifp->state == INET6_IFADDR_STATE_DAD)
2996 addrconf_dad_kick(ifp);
2997 spin_unlock(&ifp->lock);
2999 read_unlock_bh(&idev->lock);
3002 #ifdef CONFIG_PROC_FS
3003 struct if6_iter_state {
3004 struct seq_net_private p;
3008 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
3010 struct inet6_ifaddr *ifa = NULL;
3011 struct if6_iter_state *state = seq->private;
3012 struct net *net = seq_file_net(seq);
3014 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3015 struct hlist_node *n;
3016 hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket],
3018 if (net_eq(dev_net(ifa->idev->dev), net))
3024 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3025 struct inet6_ifaddr *ifa)
3027 struct if6_iter_state *state = seq->private;
3028 struct net *net = seq_file_net(seq);
3029 struct hlist_node *n = &ifa->addr_lst;
3031 hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst)
3032 if (net_eq(dev_net(ifa->idev->dev), net))
3035 while (++state->bucket < IN6_ADDR_HSIZE) {
3036 hlist_for_each_entry_rcu_bh(ifa, n,
3037 &inet6_addr_lst[state->bucket], addr_lst) {
3038 if (net_eq(dev_net(ifa->idev->dev), net))
3046 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
3048 struct inet6_ifaddr *ifa = if6_get_first(seq);
3051 while (pos && (ifa = if6_get_next(seq, ifa)) != NULL)
3053 return pos ? NULL : ifa;
3056 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3060 return if6_get_idx(seq, *pos);
3063 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3065 struct inet6_ifaddr *ifa;
3067 ifa = if6_get_next(seq, v);
3072 static void if6_seq_stop(struct seq_file *seq, void *v)
3075 rcu_read_unlock_bh();
3078 static int if6_seq_show(struct seq_file *seq, void *v)
3080 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3081 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3083 ifp->idev->dev->ifindex,
3087 ifp->idev->dev->name);
3091 static const struct seq_operations if6_seq_ops = {
3092 .start = if6_seq_start,
3093 .next = if6_seq_next,
3094 .show = if6_seq_show,
3095 .stop = if6_seq_stop,
3098 static int if6_seq_open(struct inode *inode, struct file *file)
3100 return seq_open_net(inode, file, &if6_seq_ops,
3101 sizeof(struct if6_iter_state));
3104 static const struct file_operations if6_fops = {
3105 .owner = THIS_MODULE,
3106 .open = if6_seq_open,
3108 .llseek = seq_lseek,
3109 .release = seq_release_net,
3112 static int __net_init if6_proc_net_init(struct net *net)
3114 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
3119 static void __net_exit if6_proc_net_exit(struct net *net)
3121 proc_net_remove(net, "if_inet6");
3124 static struct pernet_operations if6_proc_net_ops = {
3125 .init = if6_proc_net_init,
3126 .exit = if6_proc_net_exit,
3129 int __init if6_proc_init(void)
3131 return register_pernet_subsys(&if6_proc_net_ops);
3134 void if6_proc_exit(void)
3136 unregister_pernet_subsys(&if6_proc_net_ops);
3138 #endif /* CONFIG_PROC_FS */
3140 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3141 /* Check if address is a home address configured on any interface. */
3142 int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
3145 struct inet6_ifaddr *ifp = NULL;
3146 struct hlist_node *n;
3147 unsigned int hash = ipv6_addr_hash(addr);
3150 hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) {
3151 if (!net_eq(dev_net(ifp->idev->dev), net))
3153 if (ipv6_addr_equal(&ifp->addr, addr) &&
3154 (ifp->flags & IFA_F_HOMEADDRESS)) {
3159 rcu_read_unlock_bh();
3165 * Periodic address status verification
3168 static void addrconf_verify(unsigned long foo)
3170 unsigned long now, next, next_sec, next_sched;
3171 struct inet6_ifaddr *ifp;
3172 struct hlist_node *node;
3176 spin_lock(&addrconf_verify_lock);
3178 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3180 del_timer(&addr_chk_timer);
3182 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3184 hlist_for_each_entry_rcu_bh(ifp, node,
3185 &inet6_addr_lst[i], addr_lst) {
3188 if (ifp->flags & IFA_F_PERMANENT)
3191 spin_lock(&ifp->lock);
3192 /* We try to batch several events at once. */
3193 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3195 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3196 age >= ifp->valid_lft) {
3197 spin_unlock(&ifp->lock);
3201 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3202 spin_unlock(&ifp->lock);
3204 } else if (age >= ifp->prefered_lft) {
3205 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3208 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3210 ifp->flags |= IFA_F_DEPRECATED;
3213 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3214 next = ifp->tstamp + ifp->valid_lft * HZ;
3216 spin_unlock(&ifp->lock);
3221 ipv6_ifa_notify(0, ifp);
3225 #ifdef CONFIG_IPV6_PRIVACY
3226 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3227 !(ifp->flags&IFA_F_TENTATIVE)) {
3228 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3229 ifp->idev->cnf.dad_transmits *
3230 ifp->idev->nd_parms->retrans_time / HZ;
3232 if (age >= ifp->prefered_lft - regen_advance) {
3233 struct inet6_ifaddr *ifpub = ifp->ifpub;
3234 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3235 next = ifp->tstamp + ifp->prefered_lft * HZ;
3236 if (!ifp->regen_count && ifpub) {
3239 in6_ifa_hold(ifpub);
3240 spin_unlock(&ifp->lock);
3242 spin_lock(&ifpub->lock);
3243 ifpub->regen_count = 0;
3244 spin_unlock(&ifpub->lock);
3245 ipv6_create_tempaddr(ifpub, ifp);
3250 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3251 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3252 spin_unlock(&ifp->lock);
3255 /* ifp->prefered_lft <= ifp->valid_lft */
3256 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3257 next = ifp->tstamp + ifp->prefered_lft * HZ;
3258 spin_unlock(&ifp->lock);
3263 next_sec = round_jiffies_up(next);
3266 /* If rounded timeout is accurate enough, accept it. */
3267 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3268 next_sched = next_sec;
3270 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3271 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3272 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3274 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3275 now, next, next_sec, next_sched));
3277 addr_chk_timer.expires = next_sched;
3278 add_timer(&addr_chk_timer);
3279 spin_unlock(&addrconf_verify_lock);
3280 rcu_read_unlock_bh();
3283 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3285 struct in6_addr *pfx = NULL;
3288 pfx = nla_data(addr);
3291 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3294 pfx = nla_data(local);
3300 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3301 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3302 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3303 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3307 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3309 struct net *net = sock_net(skb->sk);
3310 struct ifaddrmsg *ifm;
3311 struct nlattr *tb[IFA_MAX+1];
3312 struct in6_addr *pfx;
3315 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3319 ifm = nlmsg_data(nlh);
3320 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3324 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3327 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3328 u32 prefered_lft, u32 valid_lft)
3332 unsigned long timeout;
3334 if (!valid_lft || (prefered_lft > valid_lft))
3337 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3338 if (addrconf_finite_timeout(timeout)) {
3339 expires = jiffies_to_clock_t(timeout * HZ);
3340 valid_lft = timeout;
3341 flags = RTF_EXPIRES;
3345 ifa_flags |= IFA_F_PERMANENT;
3348 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3349 if (addrconf_finite_timeout(timeout)) {
3351 ifa_flags |= IFA_F_DEPRECATED;
3352 prefered_lft = timeout;
3355 spin_lock_bh(&ifp->lock);
3356 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3357 ifp->tstamp = jiffies;
3358 ifp->valid_lft = valid_lft;
3359 ifp->prefered_lft = prefered_lft;
3361 spin_unlock_bh(&ifp->lock);
3362 if (!(ifp->flags&IFA_F_TENTATIVE))
3363 ipv6_ifa_notify(0, ifp);
3365 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3373 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3375 struct net *net = sock_net(skb->sk);
3376 struct ifaddrmsg *ifm;
3377 struct nlattr *tb[IFA_MAX+1];
3378 struct in6_addr *pfx;
3379 struct inet6_ifaddr *ifa;
3380 struct net_device *dev;
3381 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3385 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3389 ifm = nlmsg_data(nlh);
3390 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3394 if (tb[IFA_CACHEINFO]) {
3395 struct ifa_cacheinfo *ci;
3397 ci = nla_data(tb[IFA_CACHEINFO]);
3398 valid_lft = ci->ifa_valid;
3399 preferred_lft = ci->ifa_prefered;
3401 preferred_lft = INFINITY_LIFE_TIME;
3402 valid_lft = INFINITY_LIFE_TIME;
3405 dev = __dev_get_by_index(net, ifm->ifa_index);
3409 /* We ignore other flags so far. */
3410 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3412 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3415 * It would be best to check for !NLM_F_CREATE here but
3416 * userspace alreay relies on not having to provide this.
3418 return inet6_addr_add(net, ifm->ifa_index, pfx,
3419 ifm->ifa_prefixlen, ifa_flags,
3420 preferred_lft, valid_lft);
3423 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3424 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3427 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3434 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3435 u8 scope, int ifindex)
3437 struct ifaddrmsg *ifm;
3439 ifm = nlmsg_data(nlh);
3440 ifm->ifa_family = AF_INET6;
3441 ifm->ifa_prefixlen = prefixlen;
3442 ifm->ifa_flags = flags;
3443 ifm->ifa_scope = scope;
3444 ifm->ifa_index = ifindex;
3447 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3448 unsigned long tstamp, u32 preferred, u32 valid)
3450 struct ifa_cacheinfo ci;
3452 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3453 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3454 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3455 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3456 ci.ifa_prefered = preferred;
3457 ci.ifa_valid = valid;
3459 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3462 static inline int rt_scope(int ifa_scope)
3464 if (ifa_scope & IFA_HOST)
3465 return RT_SCOPE_HOST;
3466 else if (ifa_scope & IFA_LINK)
3467 return RT_SCOPE_LINK;
3468 else if (ifa_scope & IFA_SITE)
3469 return RT_SCOPE_SITE;
3471 return RT_SCOPE_UNIVERSE;
3474 static inline int inet6_ifaddr_msgsize(void)
3476 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3477 + nla_total_size(16) /* IFA_ADDRESS */
3478 + nla_total_size(sizeof(struct ifa_cacheinfo));
3481 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3482 u32 pid, u32 seq, int event, unsigned int flags)
3484 struct nlmsghdr *nlh;
3485 u32 preferred, valid;
3487 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3491 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3492 ifa->idev->dev->ifindex);
3494 if (!(ifa->flags&IFA_F_PERMANENT)) {
3495 preferred = ifa->prefered_lft;
3496 valid = ifa->valid_lft;
3497 if (preferred != INFINITY_LIFE_TIME) {
3498 long tval = (jiffies - ifa->tstamp)/HZ;
3499 if (preferred > tval)
3503 if (valid != INFINITY_LIFE_TIME) {
3511 preferred = INFINITY_LIFE_TIME;
3512 valid = INFINITY_LIFE_TIME;
3515 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3516 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3517 nlmsg_cancel(skb, nlh);
3521 return nlmsg_end(skb, nlh);
3524 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3525 u32 pid, u32 seq, int event, u16 flags)
3527 struct nlmsghdr *nlh;
3528 u8 scope = RT_SCOPE_UNIVERSE;
3529 int ifindex = ifmca->idev->dev->ifindex;
3531 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3532 scope = RT_SCOPE_SITE;
3534 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3538 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3539 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3540 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3541 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3542 nlmsg_cancel(skb, nlh);
3546 return nlmsg_end(skb, nlh);
3549 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3550 u32 pid, u32 seq, int event, unsigned int flags)
3552 struct nlmsghdr *nlh;
3553 u8 scope = RT_SCOPE_UNIVERSE;
3554 int ifindex = ifaca->aca_idev->dev->ifindex;
3556 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3557 scope = RT_SCOPE_SITE;
3559 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3563 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3564 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3565 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3566 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3567 nlmsg_cancel(skb, nlh);
3571 return nlmsg_end(skb, nlh);
3580 /* called with rcu_read_lock() */
3581 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3582 struct netlink_callback *cb, enum addr_type_t type,
3583 int s_ip_idx, int *p_ip_idx)
3585 struct ifmcaddr6 *ifmca;
3586 struct ifacaddr6 *ifaca;
3588 int ip_idx = *p_ip_idx;
3590 read_lock_bh(&idev->lock);
3592 case UNICAST_ADDR: {
3593 struct inet6_ifaddr *ifa;
3595 /* unicast address incl. temp addr */
3596 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3597 if (++ip_idx < s_ip_idx)
3599 err = inet6_fill_ifaddr(skb, ifa,
3600 NETLINK_CB(cb->skb).pid,
3609 case MULTICAST_ADDR:
3610 /* multicast address */
3611 for (ifmca = idev->mc_list; ifmca;
3612 ifmca = ifmca->next, ip_idx++) {
3613 if (ip_idx < s_ip_idx)
3615 err = inet6_fill_ifmcaddr(skb, ifmca,
3616 NETLINK_CB(cb->skb).pid,
3625 /* anycast address */
3626 for (ifaca = idev->ac_list; ifaca;
3627 ifaca = ifaca->aca_next, ip_idx++) {
3628 if (ip_idx < s_ip_idx)
3630 err = inet6_fill_ifacaddr(skb, ifaca,
3631 NETLINK_CB(cb->skb).pid,
3642 read_unlock_bh(&idev->lock);
3647 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3648 enum addr_type_t type)
3650 struct net *net = sock_net(skb->sk);
3653 int s_idx, s_ip_idx;
3654 struct net_device *dev;
3655 struct inet6_dev *idev;
3656 struct hlist_head *head;
3657 struct hlist_node *node;
3660 s_idx = idx = cb->args[1];
3661 s_ip_idx = ip_idx = cb->args[2];
3664 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3666 head = &net->dev_index_head[h];
3667 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3670 if (h > s_h || idx > s_idx)
3673 idev = __in6_dev_get(dev);
3677 if (in6_dump_addrs(idev, skb, cb, type,
3678 s_ip_idx, &ip_idx) <= 0)
3688 cb->args[2] = ip_idx;
3693 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3695 enum addr_type_t type = UNICAST_ADDR;
3697 return inet6_dump_addr(skb, cb, type);
3700 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3702 enum addr_type_t type = MULTICAST_ADDR;
3704 return inet6_dump_addr(skb, cb, type);
3708 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3710 enum addr_type_t type = ANYCAST_ADDR;
3712 return inet6_dump_addr(skb, cb, type);
3715 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3718 struct net *net = sock_net(in_skb->sk);
3719 struct ifaddrmsg *ifm;
3720 struct nlattr *tb[IFA_MAX+1];
3721 struct in6_addr *addr = NULL;
3722 struct net_device *dev = NULL;
3723 struct inet6_ifaddr *ifa;
3724 struct sk_buff *skb;
3727 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3731 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3737 ifm = nlmsg_data(nlh);
3739 dev = __dev_get_by_index(net, ifm->ifa_index);
3741 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
3743 err = -EADDRNOTAVAIL;
3747 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
3753 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3754 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3756 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3757 WARN_ON(err == -EMSGSIZE);
3761 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
3768 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3770 struct sk_buff *skb;
3771 struct net *net = dev_net(ifa->idev->dev);
3774 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3778 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3780 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3781 WARN_ON(err == -EMSGSIZE);
3785 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3789 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3792 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3793 __s32 *array, int bytes)
3795 BUG_ON(bytes < (DEVCONF_MAX * 4));
3797 memset(array, 0, bytes);
3798 array[DEVCONF_FORWARDING] = cnf->forwarding;
3799 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3800 array[DEVCONF_MTU6] = cnf->mtu6;
3801 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3802 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3803 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3804 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3805 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3806 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3807 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3808 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3809 #ifdef CONFIG_IPV6_PRIVACY
3810 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3811 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3812 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3813 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3814 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3816 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3817 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3818 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3819 #ifdef CONFIG_IPV6_ROUTER_PREF
3820 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3821 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3822 #ifdef CONFIG_IPV6_ROUTE_INFO
3823 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3826 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3827 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3828 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3829 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3831 #ifdef CONFIG_IPV6_MROUTE
3832 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3834 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
3835 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
3836 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
3839 static inline size_t inet6_if_nlmsg_size(void)
3841 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3842 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3843 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3844 + nla_total_size(4) /* IFLA_MTU */
3845 + nla_total_size(4) /* IFLA_LINK */
3846 + nla_total_size( /* IFLA_PROTINFO */
3847 nla_total_size(4) /* IFLA_INET6_FLAGS */
3848 + nla_total_size(sizeof(struct ifla_cacheinfo))
3849 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3850 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3851 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
3855 static inline void __snmp6_fill_stats(u64 *stats, void __percpu **mib,
3856 int items, int bytes)
3859 int pad = bytes - sizeof(u64) * items;
3862 /* Use put_unaligned() because stats may not be aligned for u64. */
3863 put_unaligned(items, &stats[0]);
3864 for (i = 1; i < items; i++)
3865 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3867 memset(&stats[items], 0, pad);
3870 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
3871 int items, int bytes, size_t syncpoff)
3874 int pad = bytes - sizeof(u64) * items;
3877 /* Use put_unaligned() because stats may not be aligned for u64. */
3878 put_unaligned(items, &stats[0]);
3879 for (i = 1; i < items; i++)
3880 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
3882 memset(&stats[items], 0, pad);
3885 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3889 case IFLA_INET6_STATS:
3890 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
3891 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
3893 case IFLA_INET6_ICMP6STATS:
3894 __snmp6_fill_stats(stats, (void __percpu **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3899 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3900 u32 pid, u32 seq, int event, unsigned int flags)
3902 struct net_device *dev = idev->dev;
3904 struct ifinfomsg *hdr;
3905 struct nlmsghdr *nlh;
3907 struct ifla_cacheinfo ci;
3909 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3913 hdr = nlmsg_data(nlh);
3914 hdr->ifi_family = AF_INET6;
3916 hdr->ifi_type = dev->type;
3917 hdr->ifi_index = dev->ifindex;
3918 hdr->ifi_flags = dev_get_flags(dev);
3919 hdr->ifi_change = 0;
3921 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3924 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3926 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3927 if (dev->ifindex != dev->iflink)
3928 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3930 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3931 if (protoinfo == NULL)
3932 goto nla_put_failure;
3934 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3936 ci.max_reasm_len = IPV6_MAXPLEN;
3937 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3938 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3939 ci.reachable_time = idev->nd_parms->reachable_time;
3940 ci.retrans_time = idev->nd_parms->retrans_time;
3941 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3943 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3945 goto nla_put_failure;
3946 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3948 /* XXX - MC not implemented */
3950 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3952 goto nla_put_failure;
3953 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3955 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3957 goto nla_put_failure;
3958 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3960 nla_nest_end(skb, protoinfo);
3961 return nlmsg_end(skb, nlh);
3964 nlmsg_cancel(skb, nlh);
3968 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3970 struct net *net = sock_net(skb->sk);
3973 struct net_device *dev;
3974 struct inet6_dev *idev;
3975 struct hlist_head *head;
3976 struct hlist_node *node;
3979 s_idx = cb->args[1];
3982 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3984 head = &net->dev_index_head[h];
3985 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3988 idev = __in6_dev_get(dev);
3991 if (inet6_fill_ifinfo(skb, idev,
3992 NETLINK_CB(cb->skb).pid,
3994 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4008 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4010 struct sk_buff *skb;
4011 struct net *net = dev_net(idev->dev);
4014 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4018 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4020 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4021 WARN_ON(err == -EMSGSIZE);
4025 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4029 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4032 static inline size_t inet6_prefix_nlmsg_size(void)
4034 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4035 + nla_total_size(sizeof(struct in6_addr))
4036 + nla_total_size(sizeof(struct prefix_cacheinfo));
4039 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4040 struct prefix_info *pinfo, u32 pid, u32 seq,
4041 int event, unsigned int flags)
4043 struct prefixmsg *pmsg;
4044 struct nlmsghdr *nlh;
4045 struct prefix_cacheinfo ci;
4047 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
4051 pmsg = nlmsg_data(nlh);
4052 pmsg->prefix_family = AF_INET6;
4053 pmsg->prefix_pad1 = 0;
4054 pmsg->prefix_pad2 = 0;
4055 pmsg->prefix_ifindex = idev->dev->ifindex;
4056 pmsg->prefix_len = pinfo->prefix_len;
4057 pmsg->prefix_type = pinfo->type;
4058 pmsg->prefix_pad3 = 0;
4059 pmsg->prefix_flags = 0;
4061 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4062 if (pinfo->autoconf)
4063 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4065 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
4067 ci.preferred_time = ntohl(pinfo->prefered);
4068 ci.valid_time = ntohl(pinfo->valid);
4069 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
4071 return nlmsg_end(skb, nlh);
4074 nlmsg_cancel(skb, nlh);
4078 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4079 struct prefix_info *pinfo)
4081 struct sk_buff *skb;
4082 struct net *net = dev_net(idev->dev);
4085 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4089 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4091 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4092 WARN_ON(err == -EMSGSIZE);
4096 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4100 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4103 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4105 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4110 * If the address was optimistic
4111 * we inserted the route at the start of
4112 * our DAD process, so we don't need
4115 if (!(ifp->rt->rt6i_node))
4116 ip6_ins_rt(ifp->rt);
4117 if (ifp->idev->cnf.forwarding)
4118 addrconf_join_anycast(ifp);
4121 if (ifp->idev->cnf.forwarding)
4122 addrconf_leave_anycast(ifp);
4123 addrconf_leave_solict(ifp->idev, &ifp->addr);
4124 dst_hold(&ifp->rt->dst);
4126 if (ifp->state == INET6_IFADDR_STATE_DEAD &&
4127 ip6_del_rt(ifp->rt))
4128 dst_free(&ifp->rt->dst);
4133 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4136 if (likely(ifp->idev->dead == 0))
4137 __ipv6_ifa_notify(event, ifp);
4138 rcu_read_unlock_bh();
4141 #ifdef CONFIG_SYSCTL
4144 int addrconf_sysctl_forward(ctl_table *ctl, int write,
4145 void __user *buffer, size_t *lenp, loff_t *ppos)
4147 int *valp = ctl->data;
4152 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4155 ret = addrconf_fixup_forwarding(ctl, valp, val);
4161 static void dev_disable_change(struct inet6_dev *idev)
4163 if (!idev || !idev->dev)
4166 if (idev->cnf.disable_ipv6)
4167 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4169 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4172 static void addrconf_disable_change(struct net *net, __s32 newf)
4174 struct net_device *dev;
4175 struct inet6_dev *idev;
4178 for_each_netdev_rcu(net, dev) {
4179 idev = __in6_dev_get(dev);
4181 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4182 idev->cnf.disable_ipv6 = newf;
4184 dev_disable_change(idev);
4190 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int old)
4194 net = (struct net *)table->extra2;
4196 if (p == &net->ipv6.devconf_dflt->disable_ipv6)
4199 if (!rtnl_trylock()) {
4200 /* Restore the original values before restarting */
4202 return restart_syscall();
4205 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4206 __s32 newf = net->ipv6.devconf_all->disable_ipv6;
4207 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4208 addrconf_disable_change(net, newf);
4209 } else if ((!*p) ^ (!old))
4210 dev_disable_change((struct inet6_dev *)table->extra1);
4217 int addrconf_sysctl_disable(ctl_table *ctl, int write,
4218 void __user *buffer, size_t *lenp, loff_t *ppos)
4220 int *valp = ctl->data;
4225 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4228 ret = addrconf_disable_ipv6(ctl, valp, val);
4234 static struct addrconf_sysctl_table
4236 struct ctl_table_header *sysctl_header;
4237 ctl_table addrconf_vars[DEVCONF_MAX+1];
4239 } addrconf_sysctl __read_mostly = {
4240 .sysctl_header = NULL,
4243 .procname = "forwarding",
4244 .data = &ipv6_devconf.forwarding,
4245 .maxlen = sizeof(int),
4247 .proc_handler = addrconf_sysctl_forward,
4250 .procname = "hop_limit",
4251 .data = &ipv6_devconf.hop_limit,
4252 .maxlen = sizeof(int),
4254 .proc_handler = proc_dointvec,
4258 .data = &ipv6_devconf.mtu6,
4259 .maxlen = sizeof(int),
4261 .proc_handler = proc_dointvec,
4264 .procname = "accept_ra",
4265 .data = &ipv6_devconf.accept_ra,
4266 .maxlen = sizeof(int),
4268 .proc_handler = proc_dointvec,
4271 .procname = "accept_redirects",
4272 .data = &ipv6_devconf.accept_redirects,
4273 .maxlen = sizeof(int),
4275 .proc_handler = proc_dointvec,
4278 .procname = "autoconf",
4279 .data = &ipv6_devconf.autoconf,
4280 .maxlen = sizeof(int),
4282 .proc_handler = proc_dointvec,
4285 .procname = "dad_transmits",
4286 .data = &ipv6_devconf.dad_transmits,
4287 .maxlen = sizeof(int),
4289 .proc_handler = proc_dointvec,
4292 .procname = "router_solicitations",
4293 .data = &ipv6_devconf.rtr_solicits,
4294 .maxlen = sizeof(int),
4296 .proc_handler = proc_dointvec,
4299 .procname = "router_solicitation_interval",
4300 .data = &ipv6_devconf.rtr_solicit_interval,
4301 .maxlen = sizeof(int),
4303 .proc_handler = proc_dointvec_jiffies,
4306 .procname = "router_solicitation_delay",
4307 .data = &ipv6_devconf.rtr_solicit_delay,
4308 .maxlen = sizeof(int),
4310 .proc_handler = proc_dointvec_jiffies,
4313 .procname = "force_mld_version",
4314 .data = &ipv6_devconf.force_mld_version,
4315 .maxlen = sizeof(int),
4317 .proc_handler = proc_dointvec,
4319 #ifdef CONFIG_IPV6_PRIVACY
4321 .procname = "use_tempaddr",
4322 .data = &ipv6_devconf.use_tempaddr,
4323 .maxlen = sizeof(int),
4325 .proc_handler = proc_dointvec,
4328 .procname = "temp_valid_lft",
4329 .data = &ipv6_devconf.temp_valid_lft,
4330 .maxlen = sizeof(int),
4332 .proc_handler = proc_dointvec,
4335 .procname = "temp_prefered_lft",
4336 .data = &ipv6_devconf.temp_prefered_lft,
4337 .maxlen = sizeof(int),
4339 .proc_handler = proc_dointvec,
4342 .procname = "regen_max_retry",
4343 .data = &ipv6_devconf.regen_max_retry,
4344 .maxlen = sizeof(int),
4346 .proc_handler = proc_dointvec,
4349 .procname = "max_desync_factor",
4350 .data = &ipv6_devconf.max_desync_factor,
4351 .maxlen = sizeof(int),
4353 .proc_handler = proc_dointvec,
4357 .procname = "max_addresses",
4358 .data = &ipv6_devconf.max_addresses,
4359 .maxlen = sizeof(int),
4361 .proc_handler = proc_dointvec,
4364 .procname = "accept_ra_defrtr",
4365 .data = &ipv6_devconf.accept_ra_defrtr,
4366 .maxlen = sizeof(int),
4368 .proc_handler = proc_dointvec,
4371 .procname = "accept_ra_pinfo",
4372 .data = &ipv6_devconf.accept_ra_pinfo,
4373 .maxlen = sizeof(int),
4375 .proc_handler = proc_dointvec,
4377 #ifdef CONFIG_IPV6_ROUTER_PREF
4379 .procname = "accept_ra_rtr_pref",
4380 .data = &ipv6_devconf.accept_ra_rtr_pref,
4381 .maxlen = sizeof(int),
4383 .proc_handler = proc_dointvec,
4386 .procname = "router_probe_interval",
4387 .data = &ipv6_devconf.rtr_probe_interval,
4388 .maxlen = sizeof(int),
4390 .proc_handler = proc_dointvec_jiffies,
4392 #ifdef CONFIG_IPV6_ROUTE_INFO
4394 .procname = "accept_ra_rt_info_max_plen",
4395 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4396 .maxlen = sizeof(int),
4398 .proc_handler = proc_dointvec,
4403 .procname = "proxy_ndp",
4404 .data = &ipv6_devconf.proxy_ndp,
4405 .maxlen = sizeof(int),
4407 .proc_handler = proc_dointvec,
4410 .procname = "accept_source_route",
4411 .data = &ipv6_devconf.accept_source_route,
4412 .maxlen = sizeof(int),
4414 .proc_handler = proc_dointvec,
4416 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4418 .procname = "optimistic_dad",
4419 .data = &ipv6_devconf.optimistic_dad,
4420 .maxlen = sizeof(int),
4422 .proc_handler = proc_dointvec,
4426 #ifdef CONFIG_IPV6_MROUTE
4428 .procname = "mc_forwarding",
4429 .data = &ipv6_devconf.mc_forwarding,
4430 .maxlen = sizeof(int),
4432 .proc_handler = proc_dointvec,
4436 .procname = "disable_ipv6",
4437 .data = &ipv6_devconf.disable_ipv6,
4438 .maxlen = sizeof(int),
4440 .proc_handler = addrconf_sysctl_disable,
4443 .procname = "accept_dad",
4444 .data = &ipv6_devconf.accept_dad,
4445 .maxlen = sizeof(int),
4447 .proc_handler = proc_dointvec,
4450 .procname = "force_tllao",
4451 .data = &ipv6_devconf.force_tllao,
4452 .maxlen = sizeof(int),
4454 .proc_handler = proc_dointvec
4462 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4463 struct inet6_dev *idev, struct ipv6_devconf *p)
4466 struct addrconf_sysctl_table *t;
4468 #define ADDRCONF_CTL_PATH_DEV 3
4470 struct ctl_path addrconf_ctl_path[] = {
4471 { .procname = "net", },
4472 { .procname = "ipv6", },
4473 { .procname = "conf", },
4474 { /* to be set */ },
4479 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4483 for (i = 0; t->addrconf_vars[i].data; i++) {
4484 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
4485 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4486 t->addrconf_vars[i].extra2 = net;
4490 * Make a copy of dev_name, because '.procname' is regarded as const
4491 * by sysctl and we wouldn't want anyone to change it under our feet
4492 * (see SIOCSIFNAME).
4494 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4498 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4500 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4502 if (t->sysctl_header == NULL)
4516 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4518 struct addrconf_sysctl_table *t;
4520 if (p->sysctl == NULL)
4525 unregister_sysctl_table(t->sysctl_header);
4530 static void addrconf_sysctl_register(struct inet6_dev *idev)
4532 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
4533 &ndisc_ifinfo_sysctl_change);
4534 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4538 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4540 __addrconf_sysctl_unregister(&idev->cnf);
4541 neigh_sysctl_unregister(idev->nd_parms);
4547 static int __net_init addrconf_init_net(struct net *net)
4550 struct ipv6_devconf *all, *dflt;
4553 all = &ipv6_devconf;
4554 dflt = &ipv6_devconf_dflt;
4556 if (!net_eq(net, &init_net)) {
4557 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4561 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4563 goto err_alloc_dflt;
4565 /* these will be inherited by all namespaces */
4566 dflt->autoconf = ipv6_defaults.autoconf;
4567 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
4570 net->ipv6.devconf_all = all;
4571 net->ipv6.devconf_dflt = dflt;
4573 #ifdef CONFIG_SYSCTL
4574 err = __addrconf_sysctl_register(net, "all", NULL, all);
4578 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
4584 #ifdef CONFIG_SYSCTL
4586 __addrconf_sysctl_unregister(all);
4596 static void __net_exit addrconf_exit_net(struct net *net)
4598 #ifdef CONFIG_SYSCTL
4599 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4600 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4602 if (!net_eq(net, &init_net)) {
4603 kfree(net->ipv6.devconf_dflt);
4604 kfree(net->ipv6.devconf_all);
4608 static struct pernet_operations addrconf_ops = {
4609 .init = addrconf_init_net,
4610 .exit = addrconf_exit_net,
4617 int register_inet6addr_notifier(struct notifier_block *nb)
4619 return atomic_notifier_chain_register(&inet6addr_chain, nb);
4621 EXPORT_SYMBOL(register_inet6addr_notifier);
4623 int unregister_inet6addr_notifier(struct notifier_block *nb)
4625 return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
4627 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4630 * Init / cleanup code
4633 int __init addrconf_init(void)
4637 err = ipv6_addr_label_init();
4639 printk(KERN_CRIT "IPv6 Addrconf:"
4640 " cannot initialize default policy table: %d.\n", err);
4644 register_pernet_subsys(&addrconf_ops);
4646 /* The addrconf netdev notifier requires that loopback_dev
4647 * has it's ipv6 private information allocated and setup
4648 * before it can bring up and give link-local addresses
4649 * to other devices which are up.
4651 * Unfortunately, loopback_dev is not necessarily the first
4652 * entry in the global dev_base list of net devices. In fact,
4653 * it is likely to be the very last entry on that list.
4654 * So this causes the notifier registry below to try and
4655 * give link-local addresses to all devices besides loopback_dev
4656 * first, then loopback_dev, which cases all the non-loopback_dev
4657 * devices to fail to get a link-local address.
4659 * So, as a temporary fix, allocate the ipv6 structure for
4660 * loopback_dev first by hand.
4661 * Longer term, all of the dependencies ipv6 has upon the loopback
4662 * device and it being up should be removed.
4665 if (!ipv6_add_dev(init_net.loopback_dev))
4671 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4672 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
4674 register_netdevice_notifier(&ipv6_dev_notf);
4678 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4682 /* Only the first call to __rtnl_register can fail */
4683 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4684 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4685 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4686 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4687 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4689 ipv6_addr_label_rtnl_register();
4693 unregister_netdevice_notifier(&ipv6_dev_notf);
4695 unregister_pernet_subsys(&addrconf_ops);
4700 void addrconf_cleanup(void)
4702 struct net_device *dev;
4705 unregister_netdevice_notifier(&ipv6_dev_notf);
4706 unregister_pernet_subsys(&addrconf_ops);
4710 /* clean dev list */
4711 for_each_netdev(&init_net, dev) {
4712 if (__in6_dev_get(dev) == NULL)
4714 addrconf_ifdown(dev, 1);
4716 addrconf_ifdown(init_net.loopback_dev, 2);
4721 spin_lock_bh(&addrconf_hash_lock);
4722 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4723 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
4724 spin_unlock_bh(&addrconf_hash_lock);
4726 del_timer(&addr_chk_timer);