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/socket.h>
44 #include <linux/sockios.h>
45 #include <linux/net.h>
46 #include <linux/in6.h>
47 #include <linux/netdevice.h>
48 #include <linux/if_addr.h>
49 #include <linux/if_arp.h>
50 #include <linux/if_arcnet.h>
51 #include <linux/if_infiniband.h>
52 #include <linux/route.h>
53 #include <linux/inetdevice.h>
54 #include <linux/init.h>
56 #include <linux/sysctl.h>
58 #include <linux/capability.h>
59 #include <linux/delay.h>
60 #include <linux/notifier.h>
61 #include <linux/string.h>
63 #include <net/net_namespace.h>
68 #include <net/protocol.h>
69 #include <net/ndisc.h>
70 #include <net/ip6_route.h>
71 #include <net/addrconf.h>
74 #include <net/netlink.h>
75 #include <net/pkt_sched.h>
76 #include <linux/if_tunnel.h>
77 #include <linux/rtnetlink.h>
79 #ifdef CONFIG_IPV6_PRIVACY
80 #include <linux/random.h>
83 #include <asm/uaccess.h>
84 #include <asm/unaligned.h>
86 #include <linux/proc_fs.h>
87 #include <linux/seq_file.h>
89 /* Set to 3 to get tracing... */
93 #define ADBG(x) printk x
98 #define INFINITY_LIFE_TIME 0xFFFFFFFF
99 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
102 static void addrconf_sysctl_register(struct inet6_dev *idev);
103 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
105 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
109 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
114 #ifdef CONFIG_IPV6_PRIVACY
115 static int __ipv6_regen_rndid(struct inet6_dev *idev);
116 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
117 static void ipv6_regen_rndid(unsigned long data);
119 static int desync_factor = MAX_DESYNC_FACTOR * HZ;
122 static int ipv6_count_addresses(struct inet6_dev *idev);
125 * Configured unicast address hash table
127 static struct inet6_ifaddr *inet6_addr_lst[IN6_ADDR_HSIZE];
128 static DEFINE_RWLOCK(addrconf_hash_lock);
130 static void addrconf_verify(unsigned long);
132 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
133 static DEFINE_SPINLOCK(addrconf_verify_lock);
135 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
136 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
138 static int addrconf_ifdown(struct net_device *dev, int how);
140 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
141 static void addrconf_dad_timer(unsigned long data);
142 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
143 static void addrconf_dad_run(struct inet6_dev *idev);
144 static void addrconf_rs_timer(unsigned long data);
145 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
146 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
148 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
149 struct prefix_info *pinfo);
150 static int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
151 struct net_device *dev);
153 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
155 struct ipv6_devconf ipv6_devconf __read_mostly = {
157 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
158 .mtu6 = IPV6_MIN_MTU,
160 .accept_redirects = 1,
162 .force_mld_version = 0,
164 .rtr_solicits = MAX_RTR_SOLICITATIONS,
165 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
166 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
167 #ifdef CONFIG_IPV6_PRIVACY
169 .temp_valid_lft = TEMP_VALID_LIFETIME,
170 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
171 .regen_max_retry = REGEN_MAX_RETRY,
172 .max_desync_factor = MAX_DESYNC_FACTOR,
174 .max_addresses = IPV6_MAX_ADDRESSES,
175 .accept_ra_defrtr = 1,
176 .accept_ra_pinfo = 1,
177 #ifdef CONFIG_IPV6_ROUTER_PREF
178 .accept_ra_rtr_pref = 1,
179 .rtr_probe_interval = 60 * HZ,
180 #ifdef CONFIG_IPV6_ROUTE_INFO
181 .accept_ra_rt_info_max_plen = 0,
185 .accept_source_route = 0, /* we do not accept RH0 by default. */
188 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
190 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
191 .mtu6 = IPV6_MIN_MTU,
193 .accept_redirects = 1,
196 .rtr_solicits = MAX_RTR_SOLICITATIONS,
197 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
198 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
199 #ifdef CONFIG_IPV6_PRIVACY
201 .temp_valid_lft = TEMP_VALID_LIFETIME,
202 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
203 .regen_max_retry = REGEN_MAX_RETRY,
204 .max_desync_factor = MAX_DESYNC_FACTOR,
206 .max_addresses = IPV6_MAX_ADDRESSES,
207 .accept_ra_defrtr = 1,
208 .accept_ra_pinfo = 1,
209 #ifdef CONFIG_IPV6_ROUTER_PREF
210 .accept_ra_rtr_pref = 1,
211 .rtr_probe_interval = 60 * HZ,
212 #ifdef CONFIG_IPV6_ROUTE_INFO
213 .accept_ra_rt_info_max_plen = 0,
217 .accept_source_route = 0, /* we do not accept RH0 by default. */
220 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
221 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
222 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
223 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
224 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
226 /* Check if a valid qdisc is available */
227 static inline int addrconf_qdisc_ok(struct net_device *dev)
229 return (dev->qdisc != &noop_qdisc);
232 /* Check if a route is valid prefix route */
233 static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
235 return ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0);
238 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
240 if (del_timer(&ifp->timer))
244 enum addrconf_timer_t
251 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
252 enum addrconf_timer_t what,
255 if (!del_timer(&ifp->timer))
260 ifp->timer.function = addrconf_dad_timer;
263 ifp->timer.function = addrconf_rs_timer;
267 ifp->timer.expires = jiffies + when;
268 add_timer(&ifp->timer);
271 static int snmp6_alloc_dev(struct inet6_dev *idev)
273 if (snmp_mib_init((void **)idev->stats.ipv6,
274 sizeof(struct ipstats_mib)) < 0)
276 if (snmp_mib_init((void **)idev->stats.icmpv6,
277 sizeof(struct icmpv6_mib)) < 0)
279 if (snmp_mib_init((void **)idev->stats.icmpv6msg,
280 sizeof(struct icmpv6msg_mib)) < 0)
286 snmp_mib_free((void **)idev->stats.icmpv6);
288 snmp_mib_free((void **)idev->stats.ipv6);
293 static void snmp6_free_dev(struct inet6_dev *idev)
295 snmp_mib_free((void **)idev->stats.icmpv6msg);
296 snmp_mib_free((void **)idev->stats.icmpv6);
297 snmp_mib_free((void **)idev->stats.ipv6);
300 /* Nobody refers to this device, we may destroy it. */
302 static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
304 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
308 void in6_dev_finish_destroy(struct inet6_dev *idev)
310 struct net_device *dev = idev->dev;
311 BUG_TRAP(idev->addr_list==NULL);
312 BUG_TRAP(idev->mc_list==NULL);
313 #ifdef NET_REFCNT_DEBUG
314 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
318 printk("Freeing alive inet6 device %p\n", idev);
321 snmp6_free_dev(idev);
322 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
325 EXPORT_SYMBOL(in6_dev_finish_destroy);
327 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
329 struct inet6_dev *ndev;
333 if (dev->mtu < IPV6_MIN_MTU)
336 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
341 rwlock_init(&ndev->lock);
343 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
344 ndev->cnf.mtu6 = dev->mtu;
345 ndev->cnf.sysctl = NULL;
346 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
347 if (ndev->nd_parms == NULL) {
351 if (ndev->cnf.forwarding)
352 dev_disable_lro(dev);
353 /* We refer to the device */
356 if (snmp6_alloc_dev(ndev) < 0) {
358 "%s(): cannot allocate memory for statistics; dev=%s.\n",
359 __func__, dev->name));
360 neigh_parms_release(&nd_tbl, ndev->nd_parms);
362 in6_dev_finish_destroy(ndev);
366 if (snmp6_register_dev(ndev) < 0) {
368 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
369 __func__, dev->name));
370 neigh_parms_release(&nd_tbl, ndev->nd_parms);
372 in6_dev_finish_destroy(ndev);
376 /* One reference from device. We must do this before
377 * we invoke __ipv6_regen_rndid().
381 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
382 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
384 "%s: Disabled Multicast RS\n",
386 ndev->cnf.rtr_solicits = 0;
390 #ifdef CONFIG_IPV6_PRIVACY
391 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
392 if ((dev->flags&IFF_LOOPBACK) ||
393 dev->type == ARPHRD_TUNNEL ||
394 dev->type == ARPHRD_TUNNEL6 ||
395 dev->type == ARPHRD_SIT ||
396 dev->type == ARPHRD_NONE) {
398 "%s: Disabled Privacy Extensions\n",
400 ndev->cnf.use_tempaddr = -1;
403 ipv6_regen_rndid((unsigned long) ndev);
407 if (netif_running(dev) && addrconf_qdisc_ok(dev))
408 ndev->if_flags |= IF_READY;
410 ipv6_mc_init_dev(ndev);
411 ndev->tstamp = jiffies;
412 addrconf_sysctl_register(ndev);
413 /* protected by rtnl_lock */
414 rcu_assign_pointer(dev->ip6_ptr, ndev);
416 /* Join all-node multicast group */
417 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
422 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
424 struct inet6_dev *idev;
428 if ((idev = __in6_dev_get(dev)) == NULL) {
429 if ((idev = ipv6_add_dev(dev)) == NULL)
433 if (dev->flags&IFF_UP)
439 static void dev_forward_change(struct inet6_dev *idev)
441 struct net_device *dev;
442 struct inet6_ifaddr *ifa;
447 if (idev->cnf.forwarding)
448 dev_disable_lro(dev);
449 if (dev && (dev->flags & IFF_MULTICAST)) {
450 if (idev->cnf.forwarding)
451 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
453 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
455 for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
456 if (ifa->flags&IFA_F_TENTATIVE)
458 if (idev->cnf.forwarding)
459 addrconf_join_anycast(ifa);
461 addrconf_leave_anycast(ifa);
466 static void addrconf_forward_change(struct net *net, __s32 newf)
468 struct net_device *dev;
469 struct inet6_dev *idev;
471 read_lock(&dev_base_lock);
472 for_each_netdev(net, dev) {
474 idev = __in6_dev_get(dev);
476 int changed = (!idev->cnf.forwarding) ^ (!newf);
477 idev->cnf.forwarding = newf;
479 dev_forward_change(idev);
483 read_unlock(&dev_base_lock);
486 static void addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
490 net = (struct net *)table->extra2;
491 if (p == &net->ipv6.devconf_dflt->forwarding)
495 if (p == &net->ipv6.devconf_all->forwarding) {
496 __s32 newf = net->ipv6.devconf_all->forwarding;
497 net->ipv6.devconf_dflt->forwarding = newf;
498 addrconf_forward_change(net, newf);
499 } else if ((!*p) ^ (!old))
500 dev_forward_change((struct inet6_dev *)table->extra1);
504 rt6_purge_dflt_routers(net);
508 /* Nobody refers to this ifaddr, destroy it */
510 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
512 BUG_TRAP(ifp->if_next==NULL);
513 BUG_TRAP(ifp->lst_next==NULL);
514 #ifdef NET_REFCNT_DEBUG
515 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
518 in6_dev_put(ifp->idev);
520 if (del_timer(&ifp->timer))
521 printk("Timer is still running, when freeing ifa=%p\n", ifp);
524 printk("Freeing alive inet6 address %p\n", ifp);
527 dst_release(&ifp->rt->u.dst);
533 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
535 struct inet6_ifaddr *ifa, **ifap;
536 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
539 * Each device address list is sorted in order of scope -
540 * global before linklocal.
542 for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
543 ifap = &ifa->if_next) {
544 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
548 ifp->if_next = *ifap;
553 * Hash function taken from net_alias.c
555 static u8 ipv6_addr_hash(const struct in6_addr *addr)
560 * We perform the hash function over the last 64 bits of the address
561 * This will include the IEEE address token on links that support it.
564 word = (__force u32)(addr->s6_addr32[2] ^ addr->s6_addr32[3]);
565 word ^= (word >> 16);
568 return ((word ^ (word >> 4)) & 0x0f);
571 /* On success it returns ifp with increased reference count */
573 static struct inet6_ifaddr *
574 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
575 int scope, u32 flags)
577 struct inet6_ifaddr *ifa = NULL;
584 err = -ENODEV; /*XXX*/
588 write_lock(&addrconf_hash_lock);
590 /* Ignore adding duplicate addresses on an interface */
591 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
592 ADBG(("ipv6_add_addr: already assigned\n"));
597 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
600 ADBG(("ipv6_add_addr: malloc failed\n"));
605 rt = addrconf_dst_alloc(idev, addr, 0);
611 ipv6_addr_copy(&ifa->addr, addr);
613 spin_lock_init(&ifa->lock);
614 init_timer(&ifa->timer);
615 ifa->timer.data = (unsigned long) ifa;
617 ifa->prefix_len = pfxlen;
618 ifa->flags = flags | IFA_F_TENTATIVE;
619 ifa->cstamp = ifa->tstamp = jiffies;
624 * part one of RFC 4429, section 3.3
625 * We should not configure an address as
626 * optimistic if we do not yet know the link
627 * layer address of our nexhop router
630 if (rt->rt6i_nexthop == NULL)
631 ifa->flags &= ~IFA_F_OPTIMISTIC;
638 /* Add to big hash table */
639 hash = ipv6_addr_hash(addr);
641 ifa->lst_next = inet6_addr_lst[hash];
642 inet6_addr_lst[hash] = ifa;
644 write_unlock(&addrconf_hash_lock);
646 write_lock(&idev->lock);
647 /* Add to inet6_dev unicast addr list. */
648 ipv6_link_dev_addr(idev, ifa);
650 #ifdef CONFIG_IPV6_PRIVACY
651 if (ifa->flags&IFA_F_TEMPORARY) {
652 ifa->tmp_next = idev->tempaddr_list;
653 idev->tempaddr_list = ifa;
659 write_unlock(&idev->lock);
661 rcu_read_unlock_bh();
663 if (likely(err == 0))
664 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
672 write_unlock(&addrconf_hash_lock);
676 /* This function wants to get referenced ifp and releases it before return */
678 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
680 struct inet6_ifaddr *ifa, **ifap;
681 struct inet6_dev *idev = ifp->idev;
683 int deleted = 0, onlink = 0;
684 unsigned long expires = jiffies;
686 hash = ipv6_addr_hash(&ifp->addr);
690 write_lock_bh(&addrconf_hash_lock);
691 for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
692 ifap = &ifa->lst_next) {
694 *ifap = ifa->lst_next;
696 ifa->lst_next = NULL;
700 write_unlock_bh(&addrconf_hash_lock);
702 write_lock_bh(&idev->lock);
703 #ifdef CONFIG_IPV6_PRIVACY
704 if (ifp->flags&IFA_F_TEMPORARY) {
705 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
706 ifap = &ifa->tmp_next) {
708 *ifap = ifa->tmp_next;
710 in6_ifa_put(ifp->ifpub);
714 ifa->tmp_next = NULL;
721 for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
723 *ifap = ifa->if_next;
726 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
730 } else if (ifp->flags & IFA_F_PERMANENT) {
731 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
733 if (ifa->flags & IFA_F_PERMANENT) {
738 unsigned long lifetime;
743 spin_lock(&ifa->lock);
745 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
747 * Note: Because this address is
748 * not permanent, lifetime <
749 * LONG_MAX / HZ here.
751 if (time_before(expires,
752 ifa->tstamp + lifetime * HZ))
753 expires = ifa->tstamp + lifetime * HZ;
754 spin_unlock(&ifa->lock);
758 ifap = &ifa->if_next;
760 write_unlock_bh(&idev->lock);
762 ipv6_ifa_notify(RTM_DELADDR, ifp);
764 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
766 addrconf_del_timer(ifp);
769 * Purge or update corresponding prefix
771 * 1) we don't purge prefix here if address was not permanent.
772 * prefix is managed by its own lifetime.
773 * 2) if there're no addresses, delete prefix.
774 * 3) if there're still other permanent address(es),
775 * corresponding prefix is still permanent.
776 * 4) otherwise, update prefix lifetime to the
777 * longest valid lifetime among the corresponding
778 * addresses on the device.
779 * Note: subsequent RA will update lifetime.
783 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
784 struct in6_addr prefix;
786 struct net *net = dev_net(ifp->idev->dev);
787 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
788 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
790 if (rt && addrconf_is_prefix_route(rt)) {
794 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
795 rt->rt6i_expires = expires;
796 rt->rt6i_flags |= RTF_EXPIRES;
799 dst_release(&rt->u.dst);
805 #ifdef CONFIG_IPV6_PRIVACY
806 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
808 struct inet6_dev *idev = ifp->idev;
809 struct in6_addr addr, *tmpaddr;
810 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
811 unsigned long regen_advance;
817 write_lock(&idev->lock);
819 spin_lock_bh(&ift->lock);
820 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
821 spin_unlock_bh(&ift->lock);
828 if (idev->cnf.use_tempaddr <= 0) {
829 write_unlock(&idev->lock);
831 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
836 spin_lock_bh(&ifp->lock);
837 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
838 idev->cnf.use_tempaddr = -1; /*XXX*/
839 spin_unlock_bh(&ifp->lock);
840 write_unlock(&idev->lock);
842 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
848 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
849 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
850 spin_unlock_bh(&ifp->lock);
851 write_unlock(&idev->lock);
853 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
859 memcpy(&addr.s6_addr[8], idev->rndid, 8);
860 tmp_valid_lft = min_t(__u32,
862 idev->cnf.temp_valid_lft);
863 tmp_prefered_lft = min_t(__u32,
865 idev->cnf.temp_prefered_lft - desync_factor / HZ);
866 tmp_plen = ifp->prefix_len;
867 max_addresses = idev->cnf.max_addresses;
868 tmp_cstamp = ifp->cstamp;
869 tmp_tstamp = ifp->tstamp;
870 spin_unlock_bh(&ifp->lock);
872 regen_advance = idev->cnf.regen_max_retry *
873 idev->cnf.dad_transmits *
874 idev->nd_parms->retrans_time / HZ;
875 write_unlock(&idev->lock);
877 /* A temporary address is created only if this calculated Preferred
878 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
879 * an implementation must not create a temporary address with a zero
880 * Preferred Lifetime.
882 if (tmp_prefered_lft <= regen_advance) {
889 addr_flags = IFA_F_TEMPORARY;
890 /* set in addrconf_prefix_rcv() */
891 if (ifp->flags & IFA_F_OPTIMISTIC)
892 addr_flags |= IFA_F_OPTIMISTIC;
894 ift = !max_addresses ||
895 ipv6_count_addresses(idev) < max_addresses ?
896 ipv6_add_addr(idev, &addr, tmp_plen,
897 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
899 if (!ift || IS_ERR(ift)) {
903 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
905 write_lock(&idev->lock);
909 spin_lock_bh(&ift->lock);
911 ift->valid_lft = tmp_valid_lft;
912 ift->prefered_lft = tmp_prefered_lft;
913 ift->cstamp = tmp_cstamp;
914 ift->tstamp = tmp_tstamp;
915 spin_unlock_bh(&ift->lock);
917 addrconf_dad_start(ift, 0);
926 * Choose an appropriate source address (RFC3484)
929 IPV6_SADDR_RULE_INIT = 0,
930 IPV6_SADDR_RULE_LOCAL,
931 IPV6_SADDR_RULE_SCOPE,
932 IPV6_SADDR_RULE_PREFERRED,
933 #ifdef CONFIG_IPV6_MIP6
937 IPV6_SADDR_RULE_LABEL,
938 #ifdef CONFIG_IPV6_PRIVACY
939 IPV6_SADDR_RULE_PRIVACY,
941 IPV6_SADDR_RULE_ORCHID,
942 IPV6_SADDR_RULE_PREFIX,
946 struct ipv6_saddr_score {
949 struct inet6_ifaddr *ifa;
950 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
955 struct ipv6_saddr_dst {
956 const struct in6_addr *addr;
963 static inline int ipv6_saddr_preferred(int type)
965 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
966 IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
971 static int ipv6_get_saddr_eval(struct net *net,
972 struct ipv6_saddr_score *score,
973 struct ipv6_saddr_dst *dst,
978 if (i <= score->rule) {
980 case IPV6_SADDR_RULE_SCOPE:
981 ret = score->scopedist;
983 case IPV6_SADDR_RULE_PREFIX:
984 ret = score->matchlen;
987 ret = !!test_bit(i, score->scorebits);
993 case IPV6_SADDR_RULE_INIT:
994 /* Rule 0: remember if hiscore is not ready yet */
997 case IPV6_SADDR_RULE_LOCAL:
998 /* Rule 1: Prefer same address */
999 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1001 case IPV6_SADDR_RULE_SCOPE:
1002 /* Rule 2: Prefer appropriate scope
1007 * ---+--+-+---> scope
1009 * | d is scope of the destination.
1011 * | \ <- smaller scope is better if
1012 * B-15 | \ if scope is enough for destinaion.
1013 * | ret = B - scope (-1 <= scope >= d <= 15).
1015 * |/ <- greater is better
1016 * -C / if scope is not enough for destination.
1017 * /| ret = scope - C (-1 <= d < scope <= 15).
1019 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1020 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1021 * Assume B = 0 and we get C > 29.
1023 ret = __ipv6_addr_src_scope(score->addr_type);
1024 if (ret >= dst->scope)
1027 ret -= 128; /* 30 is enough */
1028 score->scopedist = ret;
1030 case IPV6_SADDR_RULE_PREFERRED:
1031 /* Rule 3: Avoid deprecated and optimistic addresses */
1032 ret = ipv6_saddr_preferred(score->addr_type) ||
1033 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1035 #ifdef CONFIG_IPV6_MIP6
1036 case IPV6_SADDR_RULE_HOA:
1038 /* Rule 4: Prefer home address */
1039 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1040 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1044 case IPV6_SADDR_RULE_OIF:
1045 /* Rule 5: Prefer outgoing interface */
1046 ret = (!dst->ifindex ||
1047 dst->ifindex == score->ifa->idev->dev->ifindex);
1049 case IPV6_SADDR_RULE_LABEL:
1050 /* Rule 6: Prefer matching label */
1051 ret = ipv6_addr_label(net,
1052 &score->ifa->addr, score->addr_type,
1053 score->ifa->idev->dev->ifindex) == dst->label;
1055 #ifdef CONFIG_IPV6_PRIVACY
1056 case IPV6_SADDR_RULE_PRIVACY:
1058 /* Rule 7: Prefer public address
1059 * Note: prefer temprary address if use_tempaddr >= 2
1061 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1062 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1063 score->ifa->idev->cnf.use_tempaddr >= 2;
1064 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1068 case IPV6_SADDR_RULE_ORCHID:
1069 /* Rule 8-: Prefer ORCHID vs ORCHID or
1070 * non-ORCHID vs non-ORCHID
1072 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1073 ipv6_addr_orchid(dst->addr));
1075 case IPV6_SADDR_RULE_PREFIX:
1076 /* Rule 8: Use longest matching prefix */
1077 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1085 __set_bit(i, score->scorebits);
1091 int ipv6_dev_get_saddr(struct net_device *dst_dev,
1092 const struct in6_addr *daddr, unsigned int prefs,
1093 struct in6_addr *saddr)
1095 struct ipv6_saddr_score scores[2],
1096 *score = &scores[0], *hiscore = &scores[1];
1097 struct net *net = dev_net(dst_dev);
1098 struct ipv6_saddr_dst dst;
1099 struct net_device *dev;
1102 dst_type = __ipv6_addr_type(daddr);
1104 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1105 dst.scope = __ipv6_addr_src_scope(dst_type);
1106 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1110 hiscore->ifa = NULL;
1112 read_lock(&dev_base_lock);
1115 for_each_netdev(net, dev) {
1116 struct inet6_dev *idev;
1118 /* Candidate Source Address (section 4)
1119 * - multicast and link-local destination address,
1120 * the set of candidate source address MUST only
1121 * include addresses assigned to interfaces
1122 * belonging to the same link as the outgoing
1124 * (- For site-local destination addresses, the
1125 * set of candidate source addresses MUST only
1126 * include addresses assigned to interfaces
1127 * belonging to the same site as the outgoing
1130 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1131 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1132 dst.ifindex && dev->ifindex != dst.ifindex)
1135 idev = __in6_dev_get(dev);
1139 read_lock_bh(&idev->lock);
1140 for (score->ifa = idev->addr_list; score->ifa; score->ifa = score->ifa->if_next) {
1144 * - Tentative Address (RFC2462 section 5.4)
1145 * - A tentative address is not considered
1146 * "assigned to an interface" in the traditional
1147 * sense, unless it is also flagged as optimistic.
1148 * - Candidate Source Address (section 4)
1149 * - In any case, anycast addresses, multicast
1150 * addresses, and the unspecified address MUST
1151 * NOT be included in a candidate set.
1153 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1154 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1157 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1159 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1160 score->addr_type & IPV6_ADDR_MULTICAST)) {
1161 LIMIT_NETDEBUG(KERN_DEBUG
1162 "ADDRCONF: unspecified / multicast address "
1163 "assigned as unicast address on %s",
1169 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1171 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1172 int minihiscore, miniscore;
1174 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1175 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1177 if (minihiscore > miniscore) {
1178 if (i == IPV6_SADDR_RULE_SCOPE &&
1179 score->scopedist > 0) {
1182 * each remaining entry
1183 * has too small (not enough)
1184 * scope, because ifa entries
1185 * are sorted by their scope
1191 } else if (minihiscore < miniscore) {
1192 struct ipv6_saddr_score *tmp;
1195 in6_ifa_put(hiscore->ifa);
1197 in6_ifa_hold(score->ifa);
1203 /* restore our iterator */
1204 score->ifa = hiscore->ifa;
1211 read_unlock_bh(&idev->lock);
1214 read_unlock(&dev_base_lock);
1217 return -EADDRNOTAVAIL;
1219 ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1220 in6_ifa_put(hiscore->ifa);
1224 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1226 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1227 unsigned char banned_flags)
1229 struct inet6_dev *idev;
1230 int err = -EADDRNOTAVAIL;
1233 if ((idev = __in6_dev_get(dev)) != NULL) {
1234 struct inet6_ifaddr *ifp;
1236 read_lock_bh(&idev->lock);
1237 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1238 if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1239 ipv6_addr_copy(addr, &ifp->addr);
1244 read_unlock_bh(&idev->lock);
1250 static int ipv6_count_addresses(struct inet6_dev *idev)
1253 struct inet6_ifaddr *ifp;
1255 read_lock_bh(&idev->lock);
1256 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1258 read_unlock_bh(&idev->lock);
1262 int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1263 struct net_device *dev, int strict)
1265 struct inet6_ifaddr * ifp;
1266 u8 hash = ipv6_addr_hash(addr);
1268 read_lock_bh(&addrconf_hash_lock);
1269 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1270 if (!net_eq(dev_net(ifp->idev->dev), net))
1272 if (ipv6_addr_equal(&ifp->addr, addr) &&
1273 !(ifp->flags&IFA_F_TENTATIVE)) {
1274 if (dev == NULL || ifp->idev->dev == dev ||
1275 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1279 read_unlock_bh(&addrconf_hash_lock);
1282 EXPORT_SYMBOL(ipv6_chk_addr);
1285 int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1286 struct net_device *dev)
1288 struct inet6_ifaddr * ifp;
1289 u8 hash = ipv6_addr_hash(addr);
1291 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1292 if (!net_eq(dev_net(ifp->idev->dev), net))
1294 if (ipv6_addr_equal(&ifp->addr, addr)) {
1295 if (dev == NULL || ifp->idev->dev == dev)
1302 int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev)
1304 struct inet6_dev *idev;
1305 struct inet6_ifaddr *ifa;
1310 idev = __in6_dev_get(dev);
1312 read_lock_bh(&idev->lock);
1313 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
1314 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1319 read_unlock_bh(&idev->lock);
1325 EXPORT_SYMBOL(ipv6_chk_prefix);
1327 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1328 struct net_device *dev, int strict)
1330 struct inet6_ifaddr * ifp;
1331 u8 hash = ipv6_addr_hash(addr);
1333 read_lock_bh(&addrconf_hash_lock);
1334 for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1335 if (!net_eq(dev_net(ifp->idev->dev), net))
1337 if (ipv6_addr_equal(&ifp->addr, addr)) {
1338 if (dev == NULL || ifp->idev->dev == dev ||
1339 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1345 read_unlock_bh(&addrconf_hash_lock);
1350 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
1352 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
1353 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
1354 __be32 sk_rcv_saddr = inet_sk(sk)->rcv_saddr;
1355 __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2);
1356 int sk_ipv6only = ipv6_only_sock(sk);
1357 int sk2_ipv6only = inet_v6_ipv6only(sk2);
1358 int addr_type = ipv6_addr_type(sk_rcv_saddr6);
1359 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
1361 if (!sk2_rcv_saddr && !sk_ipv6only)
1364 if (addr_type2 == IPV6_ADDR_ANY &&
1365 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
1368 if (addr_type == IPV6_ADDR_ANY &&
1369 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
1372 if (sk2_rcv_saddr6 &&
1373 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
1376 if (addr_type == IPV6_ADDR_MAPPED &&
1378 (!sk2_rcv_saddr || !sk_rcv_saddr || sk_rcv_saddr == sk2_rcv_saddr))
1384 /* Gets referenced address, destroys ifaddr */
1386 static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
1388 if (ifp->flags&IFA_F_PERMANENT) {
1389 spin_lock_bh(&ifp->lock);
1390 addrconf_del_timer(ifp);
1391 ifp->flags |= IFA_F_TENTATIVE;
1392 spin_unlock_bh(&ifp->lock);
1394 #ifdef CONFIG_IPV6_PRIVACY
1395 } else if (ifp->flags&IFA_F_TEMPORARY) {
1396 struct inet6_ifaddr *ifpub;
1397 spin_lock_bh(&ifp->lock);
1400 in6_ifa_hold(ifpub);
1401 spin_unlock_bh(&ifp->lock);
1402 ipv6_create_tempaddr(ifpub, ifp);
1405 spin_unlock_bh(&ifp->lock);
1413 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1415 if (net_ratelimit())
1416 printk(KERN_INFO "%s: duplicate address detected!\n", ifp->idev->dev->name);
1417 addrconf_dad_stop(ifp);
1420 /* Join to solicited addr multicast group. */
1422 void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1424 struct in6_addr maddr;
1426 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1429 addrconf_addr_solict_mult(addr, &maddr);
1430 ipv6_dev_mc_inc(dev, &maddr);
1433 void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1435 struct in6_addr maddr;
1437 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1440 addrconf_addr_solict_mult(addr, &maddr);
1441 __ipv6_dev_mc_dec(idev, &maddr);
1444 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1446 struct in6_addr addr;
1447 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1448 if (ipv6_addr_any(&addr))
1450 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1453 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1455 struct in6_addr addr;
1456 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1457 if (ipv6_addr_any(&addr))
1459 __ipv6_dev_ac_dec(ifp->idev, &addr);
1462 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1464 if (dev->addr_len != ETH_ALEN)
1466 memcpy(eui, dev->dev_addr, 3);
1467 memcpy(eui + 5, dev->dev_addr + 3, 3);
1470 * The zSeries OSA network cards can be shared among various
1471 * OS instances, but the OSA cards have only one MAC address.
1472 * This leads to duplicate address conflicts in conjunction
1473 * with IPv6 if more than one instance uses the same card.
1475 * The driver for these cards can deliver a unique 16-bit
1476 * identifier for each instance sharing the same card. It is
1477 * placed instead of 0xFFFE in the interface identifier. The
1478 * "u" bit of the interface identifier is not inverted in this
1479 * case. Hence the resulting interface identifier has local
1480 * scope according to RFC2373.
1483 eui[3] = (dev->dev_id >> 8) & 0xFF;
1484 eui[4] = dev->dev_id & 0xFF;
1493 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1495 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1496 if (dev->addr_len != ARCNET_ALEN)
1499 eui[7] = *(u8*)dev->dev_addr;
1503 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1505 if (dev->addr_len != INFINIBAND_ALEN)
1507 memcpy(eui, dev->dev_addr + 12, 8);
1512 int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1514 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1515 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1516 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1517 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1518 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1519 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1523 memcpy(eui + 4, &addr, 4);
1526 EXPORT_SYMBOL(__ipv6_isatap_ifid);
1528 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1530 if (dev->priv_flags & IFF_ISATAP)
1531 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1535 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1537 switch (dev->type) {
1540 case ARPHRD_IEEE802_TR:
1541 return addrconf_ifid_eui48(eui, dev);
1543 return addrconf_ifid_arcnet(eui, dev);
1544 case ARPHRD_INFINIBAND:
1545 return addrconf_ifid_infiniband(eui, dev);
1547 return addrconf_ifid_sit(eui, dev);
1552 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1555 struct inet6_ifaddr *ifp;
1557 read_lock_bh(&idev->lock);
1558 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1559 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1560 memcpy(eui, ifp->addr.s6_addr+8, 8);
1565 read_unlock_bh(&idev->lock);
1569 #ifdef CONFIG_IPV6_PRIVACY
1570 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1571 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1574 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1575 idev->rndid[0] &= ~0x02;
1578 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1579 * check if generated address is not inappropriate
1581 * - Reserved subnet anycast (RFC 2526)
1582 * 11111101 11....11 1xxxxxxx
1583 * - ISATAP (RFC4214) 6.1
1584 * 00-00-5E-FE-xx-xx-xx-xx
1586 * - XXX: already assigned to an address on the device
1588 if (idev->rndid[0] == 0xfd &&
1589 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1590 (idev->rndid[7]&0x80))
1592 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1593 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1595 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1602 static void ipv6_regen_rndid(unsigned long data)
1604 struct inet6_dev *idev = (struct inet6_dev *) data;
1605 unsigned long expires;
1608 write_lock_bh(&idev->lock);
1613 if (__ipv6_regen_rndid(idev) < 0)
1617 idev->cnf.temp_prefered_lft * HZ -
1618 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1619 if (time_before(expires, jiffies)) {
1621 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1626 if (!mod_timer(&idev->regen_timer, expires))
1630 write_unlock_bh(&idev->lock);
1631 rcu_read_unlock_bh();
1635 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1638 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1639 ret = __ipv6_regen_rndid(idev);
1649 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1650 unsigned long expires, u32 flags)
1652 struct fib6_config cfg = {
1653 .fc_table = RT6_TABLE_PREFIX,
1654 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1655 .fc_ifindex = dev->ifindex,
1656 .fc_expires = expires,
1658 .fc_flags = RTF_UP | flags,
1659 .fc_nlinfo.nl_net = dev_net(dev),
1662 ipv6_addr_copy(&cfg.fc_dst, pfx);
1664 /* Prevent useless cloning on PtP SIT.
1665 This thing is done here expecting that the whole
1666 class of non-broadcast devices need not cloning.
1668 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1669 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1670 cfg.fc_flags |= RTF_NONEXTHOP;
1673 ip6_route_add(&cfg);
1676 /* Create "default" multicast route to the interface */
1678 static void addrconf_add_mroute(struct net_device *dev)
1680 struct fib6_config cfg = {
1681 .fc_table = RT6_TABLE_LOCAL,
1682 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1683 .fc_ifindex = dev->ifindex,
1686 .fc_nlinfo.nl_net = dev_net(dev),
1689 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1691 ip6_route_add(&cfg);
1694 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1695 static void sit_route_add(struct net_device *dev)
1697 struct fib6_config cfg = {
1698 .fc_table = RT6_TABLE_MAIN,
1699 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1700 .fc_ifindex = dev->ifindex,
1702 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1703 .fc_nlinfo.nl_net = dev_net(dev),
1706 /* prefix length - 96 bits "::d.d.d.d" */
1707 ip6_route_add(&cfg);
1711 static void addrconf_add_lroute(struct net_device *dev)
1713 struct in6_addr addr;
1715 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1716 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1719 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1721 struct inet6_dev *idev;
1725 if ((idev = ipv6_find_idev(dev)) == NULL)
1728 /* Add default multicast route */
1729 addrconf_add_mroute(dev);
1731 /* Add link local route */
1732 addrconf_add_lroute(dev);
1736 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1738 struct prefix_info *pinfo;
1742 struct inet6_dev *in6_dev;
1744 pinfo = (struct prefix_info *) opt;
1746 if (len < sizeof(struct prefix_info)) {
1747 ADBG(("addrconf: prefix option too short\n"));
1752 * Validation checks ([ADDRCONF], page 19)
1755 addr_type = ipv6_addr_type(&pinfo->prefix);
1757 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1760 valid_lft = ntohl(pinfo->valid);
1761 prefered_lft = ntohl(pinfo->prefered);
1763 if (prefered_lft > valid_lft) {
1764 if (net_ratelimit())
1765 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1769 in6_dev = in6_dev_get(dev);
1771 if (in6_dev == NULL) {
1772 if (net_ratelimit())
1773 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1778 * Two things going on here:
1779 * 1) Add routes for on-link prefixes
1780 * 2) Configure prefixes with the auto flag set
1783 if (pinfo->onlink) {
1784 struct rt6_info *rt;
1785 unsigned long rt_expires;
1787 /* Avoid arithmetic overflow. Really, we could
1788 * save rt_expires in seconds, likely valid_lft,
1789 * but it would require division in fib gc, that it
1793 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1795 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
1797 if (addrconf_finite_timeout(rt_expires))
1800 rt = rt6_lookup(dev_net(dev), &pinfo->prefix, NULL,
1803 if (rt && addrconf_is_prefix_route(rt)) {
1804 /* Autoconf prefix route */
1805 if (valid_lft == 0) {
1808 } else if (addrconf_finite_timeout(rt_expires)) {
1810 rt->rt6i_expires = jiffies + rt_expires;
1811 rt->rt6i_flags |= RTF_EXPIRES;
1813 rt->rt6i_flags &= ~RTF_EXPIRES;
1814 rt->rt6i_expires = 0;
1816 } else if (valid_lft) {
1817 clock_t expires = 0;
1818 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1819 if (addrconf_finite_timeout(rt_expires)) {
1821 flags |= RTF_EXPIRES;
1822 expires = jiffies_to_clock_t(rt_expires);
1824 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1825 dev, expires, flags);
1828 dst_release(&rt->u.dst);
1831 /* Try to figure out our local address for this prefix */
1833 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1834 struct inet6_ifaddr * ifp;
1835 struct in6_addr addr;
1836 int create = 0, update_lft = 0;
1838 if (pinfo->prefix_len == 64) {
1839 memcpy(&addr, &pinfo->prefix, 8);
1840 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1841 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1842 in6_dev_put(in6_dev);
1847 if (net_ratelimit())
1848 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1850 in6_dev_put(in6_dev);
1855 ifp = ipv6_get_ifaddr(dev_net(dev), &addr, dev, 1);
1857 if (ifp == NULL && valid_lft) {
1858 int max_addresses = in6_dev->cnf.max_addresses;
1861 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1862 if (in6_dev->cnf.optimistic_dad &&
1863 !ipv6_devconf.forwarding)
1864 addr_flags = IFA_F_OPTIMISTIC;
1867 /* Do not allow to create too much of autoconfigured
1868 * addresses; this would be too easy way to crash kernel.
1870 if (!max_addresses ||
1871 ipv6_count_addresses(in6_dev) < max_addresses)
1872 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1873 addr_type&IPV6_ADDR_SCOPE_MASK,
1876 if (!ifp || IS_ERR(ifp)) {
1877 in6_dev_put(in6_dev);
1881 update_lft = create = 1;
1882 ifp->cstamp = jiffies;
1883 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1889 #ifdef CONFIG_IPV6_PRIVACY
1890 struct inet6_ifaddr *ift;
1894 /* update lifetime (RFC2462 5.5.3 e) */
1895 spin_lock(&ifp->lock);
1897 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1898 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1901 if (!update_lft && stored_lft) {
1902 if (valid_lft > MIN_VALID_LIFETIME ||
1903 valid_lft > stored_lft)
1905 else if (stored_lft <= MIN_VALID_LIFETIME) {
1906 /* valid_lft <= stored_lft is always true */
1910 valid_lft = MIN_VALID_LIFETIME;
1911 if (valid_lft < prefered_lft)
1912 prefered_lft = valid_lft;
1918 ifp->valid_lft = valid_lft;
1919 ifp->prefered_lft = prefered_lft;
1922 ifp->flags &= ~IFA_F_DEPRECATED;
1923 spin_unlock(&ifp->lock);
1925 if (!(flags&IFA_F_TENTATIVE))
1926 ipv6_ifa_notify(0, ifp);
1928 spin_unlock(&ifp->lock);
1930 #ifdef CONFIG_IPV6_PRIVACY
1931 read_lock_bh(&in6_dev->lock);
1932 /* update all temporary addresses in the list */
1933 for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1935 * When adjusting the lifetimes of an existing
1936 * temporary address, only lower the lifetimes.
1937 * Implementations must not increase the
1938 * lifetimes of an existing temporary address
1939 * when processing a Prefix Information Option.
1941 if (ifp != ift->ifpub)
1944 spin_lock(&ift->lock);
1946 if (ift->valid_lft > valid_lft &&
1947 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1948 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1949 if (ift->prefered_lft > prefered_lft &&
1950 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1951 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1952 spin_unlock(&ift->lock);
1953 if (!(flags&IFA_F_TENTATIVE))
1954 ipv6_ifa_notify(0, ift);
1957 if (create && in6_dev->cnf.use_tempaddr > 0) {
1959 * When a new public address is created as described in [ADDRCONF],
1960 * also create a new temporary address.
1962 read_unlock_bh(&in6_dev->lock);
1963 ipv6_create_tempaddr(ifp, NULL);
1965 read_unlock_bh(&in6_dev->lock);
1972 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
1973 in6_dev_put(in6_dev);
1977 * Set destination address.
1978 * Special case for SIT interfaces where we create a new "virtual"
1981 int addrconf_set_dstaddr(struct net *net, void __user *arg)
1983 struct in6_ifreq ireq;
1984 struct net_device *dev;
1990 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
1993 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
1999 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2000 if (dev->type == ARPHRD_SIT) {
2003 struct ip_tunnel_parm p;
2005 err = -EADDRNOTAVAIL;
2006 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2009 memset(&p, 0, sizeof(p));
2010 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2014 p.iph.protocol = IPPROTO_IPV6;
2016 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2018 oldfs = get_fs(); set_fs(KERNEL_DS);
2019 err = dev->do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2024 dev = __dev_get_by_name(net, p.name);
2027 err = dev_open(dev);
2038 * Manual configuration of address on an interface
2040 static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx,
2041 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2044 struct inet6_ifaddr *ifp;
2045 struct inet6_dev *idev;
2046 struct net_device *dev;
2050 unsigned long timeout;
2057 /* check the lifetime */
2058 if (!valid_lft || prefered_lft > valid_lft)
2061 dev = __dev_get_by_index(net, ifindex);
2065 if ((idev = addrconf_add_dev(dev)) == NULL)
2068 scope = ipv6_addr_scope(pfx);
2070 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2071 if (addrconf_finite_timeout(timeout)) {
2072 expires = jiffies_to_clock_t(timeout * HZ);
2073 valid_lft = timeout;
2074 flags = RTF_EXPIRES;
2078 ifa_flags |= IFA_F_PERMANENT;
2081 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2082 if (addrconf_finite_timeout(timeout)) {
2084 ifa_flags |= IFA_F_DEPRECATED;
2085 prefered_lft = timeout;
2088 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2091 spin_lock_bh(&ifp->lock);
2092 ifp->valid_lft = valid_lft;
2093 ifp->prefered_lft = prefered_lft;
2094 ifp->tstamp = jiffies;
2095 spin_unlock_bh(&ifp->lock);
2097 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2100 * Note that section 3.1 of RFC 4429 indicates
2101 * that the Optimistic flag should not be set for
2102 * manually configured addresses
2104 addrconf_dad_start(ifp, 0);
2110 return PTR_ERR(ifp);
2113 static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx,
2116 struct inet6_ifaddr *ifp;
2117 struct inet6_dev *idev;
2118 struct net_device *dev;
2123 dev = __dev_get_by_index(net, ifindex);
2127 if ((idev = __in6_dev_get(dev)) == NULL)
2130 read_lock_bh(&idev->lock);
2131 for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
2132 if (ifp->prefix_len == plen &&
2133 ipv6_addr_equal(pfx, &ifp->addr)) {
2135 read_unlock_bh(&idev->lock);
2139 /* If the last address is deleted administratively,
2140 disable IPv6 on this interface.
2142 if (idev->addr_list == NULL)
2143 addrconf_ifdown(idev->dev, 1);
2147 read_unlock_bh(&idev->lock);
2148 return -EADDRNOTAVAIL;
2152 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2154 struct in6_ifreq ireq;
2157 if (!capable(CAP_NET_ADMIN))
2160 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2164 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2165 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2166 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2171 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2173 struct in6_ifreq ireq;
2176 if (!capable(CAP_NET_ADMIN))
2179 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2183 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2184 ireq.ifr6_prefixlen);
2189 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2190 static void sit_add_v4_addrs(struct inet6_dev *idev)
2192 struct inet6_ifaddr * ifp;
2193 struct in6_addr addr;
2194 struct net_device *dev;
2195 struct net *net = dev_net(idev->dev);
2200 memset(&addr, 0, sizeof(struct in6_addr));
2201 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2203 if (idev->dev->flags&IFF_POINTOPOINT) {
2204 addr.s6_addr32[0] = htonl(0xfe800000);
2207 scope = IPV6_ADDR_COMPATv4;
2210 if (addr.s6_addr32[3]) {
2211 ifp = ipv6_add_addr(idev, &addr, 128, scope, IFA_F_PERMANENT);
2213 spin_lock_bh(&ifp->lock);
2214 ifp->flags &= ~IFA_F_TENTATIVE;
2215 spin_unlock_bh(&ifp->lock);
2216 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2222 for_each_netdev(net, dev) {
2223 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2224 if (in_dev && (dev->flags & IFF_UP)) {
2225 struct in_ifaddr * ifa;
2229 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2232 addr.s6_addr32[3] = ifa->ifa_local;
2234 if (ifa->ifa_scope == RT_SCOPE_LINK)
2236 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2237 if (idev->dev->flags&IFF_POINTOPOINT)
2241 if (idev->dev->flags&IFF_POINTOPOINT)
2246 ifp = ipv6_add_addr(idev, &addr, plen, flag,
2249 spin_lock_bh(&ifp->lock);
2250 ifp->flags &= ~IFA_F_TENTATIVE;
2251 spin_unlock_bh(&ifp->lock);
2252 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2261 static void init_loopback(struct net_device *dev)
2263 struct inet6_dev *idev;
2264 struct inet6_ifaddr * ifp;
2270 if ((idev = ipv6_find_idev(dev)) == NULL) {
2271 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2275 ifp = ipv6_add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFA_F_PERMANENT);
2277 spin_lock_bh(&ifp->lock);
2278 ifp->flags &= ~IFA_F_TENTATIVE;
2279 spin_unlock_bh(&ifp->lock);
2280 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2285 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2287 struct inet6_ifaddr * ifp;
2288 u32 addr_flags = IFA_F_PERMANENT;
2290 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2291 if (idev->cnf.optimistic_dad &&
2292 !ipv6_devconf.forwarding)
2293 addr_flags |= IFA_F_OPTIMISTIC;
2297 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2299 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2300 addrconf_dad_start(ifp, 0);
2305 static void addrconf_dev_config(struct net_device *dev)
2307 struct in6_addr addr;
2308 struct inet6_dev * idev;
2312 if ((dev->type != ARPHRD_ETHER) &&
2313 (dev->type != ARPHRD_FDDI) &&
2314 (dev->type != ARPHRD_IEEE802_TR) &&
2315 (dev->type != ARPHRD_ARCNET) &&
2316 (dev->type != ARPHRD_INFINIBAND)) {
2317 /* Alas, we support only Ethernet autoconfiguration. */
2321 idev = addrconf_add_dev(dev);
2325 memset(&addr, 0, sizeof(struct in6_addr));
2326 addr.s6_addr32[0] = htonl(0xFE800000);
2328 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2329 addrconf_add_linklocal(idev, &addr);
2332 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2333 static void addrconf_sit_config(struct net_device *dev)
2335 struct inet6_dev *idev;
2340 * Configure the tunnel with one of our IPv4
2341 * addresses... we should configure all of
2342 * our v4 addrs in the tunnel
2345 if ((idev = ipv6_find_idev(dev)) == NULL) {
2346 printk(KERN_DEBUG "init sit: add_dev failed\n");
2350 if (dev->priv_flags & IFF_ISATAP) {
2351 struct in6_addr addr;
2353 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2354 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2355 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2356 addrconf_add_linklocal(idev, &addr);
2360 sit_add_v4_addrs(idev);
2362 if (dev->flags&IFF_POINTOPOINT) {
2363 addrconf_add_mroute(dev);
2364 addrconf_add_lroute(dev);
2371 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2373 struct in6_addr lladdr;
2375 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2376 addrconf_add_linklocal(idev, &lladdr);
2382 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2384 struct net_device *link_dev;
2385 struct net *net = dev_net(idev->dev);
2387 /* first try to inherit the link-local address from the link device */
2388 if (idev->dev->iflink &&
2389 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2390 if (!ipv6_inherit_linklocal(idev, link_dev))
2393 /* then try to inherit it from any device */
2394 for_each_netdev(net, link_dev) {
2395 if (!ipv6_inherit_linklocal(idev, link_dev))
2398 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2402 * Autoconfigure tunnel with a link-local address so routing protocols,
2403 * DHCPv6, MLD etc. can be run over the virtual link
2406 static void addrconf_ip6_tnl_config(struct net_device *dev)
2408 struct inet6_dev *idev;
2412 if ((idev = addrconf_add_dev(dev)) == NULL) {
2413 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2416 ip6_tnl_add_linklocal(idev);
2419 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2422 struct net_device *dev = (struct net_device *) data;
2423 struct inet6_dev *idev = __in6_dev_get(dev);
2424 int run_pending = 0;
2428 case NETDEV_REGISTER:
2429 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2430 idev = ipv6_add_dev(dev);
2432 return notifier_from_errno(-ENOMEM);
2437 if (dev->flags & IFF_SLAVE)
2440 if (event == NETDEV_UP) {
2441 if (!addrconf_qdisc_ok(dev)) {
2442 /* device is not ready yet. */
2444 "ADDRCONF(NETDEV_UP): %s: "
2445 "link is not ready\n",
2450 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2451 idev = ipv6_add_dev(dev);
2454 idev->if_flags |= IF_READY;
2456 if (!addrconf_qdisc_ok(dev)) {
2457 /* device is still not ready. */
2462 if (idev->if_flags & IF_READY) {
2463 /* device is already configured. */
2466 idev->if_flags |= IF_READY;
2470 "ADDRCONF(NETDEV_CHANGE): %s: "
2471 "link becomes ready\n",
2478 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2480 addrconf_sit_config(dev);
2483 case ARPHRD_TUNNEL6:
2484 addrconf_ip6_tnl_config(dev);
2486 case ARPHRD_LOOPBACK:
2491 addrconf_dev_config(dev);
2496 addrconf_dad_run(idev);
2498 /* If the MTU changed during the interface down, when the
2499 interface up, the changed MTU must be reflected in the
2500 idev as well as routers.
2502 if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2503 rt6_mtu_change(dev, dev->mtu);
2504 idev->cnf.mtu6 = dev->mtu;
2506 idev->tstamp = jiffies;
2507 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2508 /* If the changed mtu during down is lower than IPV6_MIN_MTU
2509 stop IPv6 on this interface.
2511 if (dev->mtu < IPV6_MIN_MTU)
2512 addrconf_ifdown(dev, event != NETDEV_DOWN);
2516 case NETDEV_CHANGEMTU:
2517 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2518 rt6_mtu_change(dev, dev->mtu);
2519 idev->cnf.mtu6 = dev->mtu;
2523 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2524 idev = ipv6_add_dev(dev);
2529 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2532 case NETDEV_UNREGISTER:
2534 * Remove all addresses from this interface.
2536 addrconf_ifdown(dev, event != NETDEV_DOWN);
2539 case NETDEV_CHANGENAME:
2541 snmp6_unregister_dev(idev);
2542 addrconf_sysctl_unregister(idev);
2543 addrconf_sysctl_register(idev);
2544 err = snmp6_register_dev(idev);
2546 return notifier_from_errno(err);
2555 * addrconf module should be notified of a device going up
2557 static struct notifier_block ipv6_dev_notf = {
2558 .notifier_call = addrconf_notify,
2562 static int addrconf_ifdown(struct net_device *dev, int how)
2564 struct inet6_dev *idev;
2565 struct inet6_ifaddr *ifa, **bifa;
2566 struct net *net = dev_net(dev);
2571 if ((dev->flags & IFF_LOOPBACK) && how == 1)
2574 rt6_ifdown(net, dev);
2575 neigh_ifdown(&nd_tbl, dev);
2577 idev = __in6_dev_get(dev);
2581 /* Step 1: remove reference to ipv6 device from parent device.
2587 /* protected by rtnl_lock */
2588 rcu_assign_pointer(dev->ip6_ptr, NULL);
2590 /* Step 1.5: remove snmp6 entry */
2591 snmp6_unregister_dev(idev);
2595 /* Step 2: clear hash table */
2596 for (i=0; i<IN6_ADDR_HSIZE; i++) {
2597 bifa = &inet6_addr_lst[i];
2599 write_lock_bh(&addrconf_hash_lock);
2600 while ((ifa = *bifa) != NULL) {
2601 if (ifa->idev == idev) {
2602 *bifa = ifa->lst_next;
2603 ifa->lst_next = NULL;
2604 addrconf_del_timer(ifa);
2608 bifa = &ifa->lst_next;
2610 write_unlock_bh(&addrconf_hash_lock);
2613 write_lock_bh(&idev->lock);
2615 /* Step 3: clear flags for stateless addrconf */
2617 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2619 /* Step 4: clear address list */
2620 #ifdef CONFIG_IPV6_PRIVACY
2621 if (how && del_timer(&idev->regen_timer))
2624 /* clear tempaddr list */
2625 while ((ifa = idev->tempaddr_list) != NULL) {
2626 idev->tempaddr_list = ifa->tmp_next;
2627 ifa->tmp_next = NULL;
2629 write_unlock_bh(&idev->lock);
2630 spin_lock_bh(&ifa->lock);
2633 in6_ifa_put(ifa->ifpub);
2636 spin_unlock_bh(&ifa->lock);
2638 write_lock_bh(&idev->lock);
2641 while ((ifa = idev->addr_list) != NULL) {
2642 idev->addr_list = ifa->if_next;
2643 ifa->if_next = NULL;
2645 addrconf_del_timer(ifa);
2646 write_unlock_bh(&idev->lock);
2648 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2649 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2652 write_lock_bh(&idev->lock);
2654 write_unlock_bh(&idev->lock);
2656 /* Step 5: Discard multicast list */
2659 ipv6_mc_destroy_dev(idev);
2663 idev->tstamp = jiffies;
2665 /* Shot the device (if unregistered) */
2668 addrconf_sysctl_unregister(idev);
2669 neigh_parms_release(&nd_tbl, idev->nd_parms);
2670 neigh_ifdown(&nd_tbl, dev);
2676 static void addrconf_rs_timer(unsigned long data)
2678 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2680 if (ifp->idev->cnf.forwarding)
2683 if (ifp->idev->if_flags & IF_RA_RCVD) {
2685 * Announcement received after solicitation
2691 spin_lock(&ifp->lock);
2692 if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2693 /* The wait after the last probe can be shorter */
2694 addrconf_mod_timer(ifp, AC_RS,
2695 (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2696 ifp->idev->cnf.rtr_solicit_delay :
2697 ifp->idev->cnf.rtr_solicit_interval);
2698 spin_unlock(&ifp->lock);
2700 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2702 spin_unlock(&ifp->lock);
2704 * Note: we do not support deprecated "all on-link"
2705 * assumption any longer.
2707 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2708 ifp->idev->dev->name);
2716 * Duplicate Address Detection
2718 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2720 unsigned long rand_num;
2721 struct inet6_dev *idev = ifp->idev;
2723 if (ifp->flags & IFA_F_OPTIMISTIC)
2726 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2728 ifp->probes = idev->cnf.dad_transmits;
2729 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2732 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2734 struct inet6_dev *idev = ifp->idev;
2735 struct net_device *dev = idev->dev;
2737 addrconf_join_solict(dev, &ifp->addr);
2739 net_srandom(ifp->addr.s6_addr32[3]);
2741 read_lock_bh(&idev->lock);
2744 spin_lock_bh(&ifp->lock);
2746 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2747 !(ifp->flags&IFA_F_TENTATIVE) ||
2748 ifp->flags & IFA_F_NODAD) {
2749 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2750 spin_unlock_bh(&ifp->lock);
2751 read_unlock_bh(&idev->lock);
2753 addrconf_dad_completed(ifp);
2757 if (!(idev->if_flags & IF_READY)) {
2758 spin_unlock_bh(&ifp->lock);
2759 read_unlock_bh(&idev->lock);
2761 * If the defice is not ready:
2762 * - keep it tentative if it is a permanent address.
2763 * - otherwise, kill it.
2766 addrconf_dad_stop(ifp);
2771 * Optimistic nodes can start receiving
2774 if(ifp->flags & IFA_F_OPTIMISTIC)
2775 ip6_ins_rt(ifp->rt);
2777 addrconf_dad_kick(ifp);
2778 spin_unlock_bh(&ifp->lock);
2780 read_unlock_bh(&idev->lock);
2783 static void addrconf_dad_timer(unsigned long data)
2785 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2786 struct inet6_dev *idev = ifp->idev;
2787 struct in6_addr mcaddr;
2789 read_lock_bh(&idev->lock);
2791 read_unlock_bh(&idev->lock);
2794 spin_lock_bh(&ifp->lock);
2795 if (ifp->probes == 0) {
2797 * DAD was successful
2800 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
2801 spin_unlock_bh(&ifp->lock);
2802 read_unlock_bh(&idev->lock);
2804 addrconf_dad_completed(ifp);
2810 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2811 spin_unlock_bh(&ifp->lock);
2812 read_unlock_bh(&idev->lock);
2814 /* send a neighbour solicitation for our addr */
2815 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2816 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
2821 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2823 struct net_device * dev = ifp->idev->dev;
2826 * Configure the address for reception. Now it is valid.
2829 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2831 /* If added prefix is link local and forwarding is off,
2832 start sending router solicitations.
2835 if (ifp->idev->cnf.forwarding == 0 &&
2836 ifp->idev->cnf.rtr_solicits > 0 &&
2837 (dev->flags&IFF_LOOPBACK) == 0 &&
2838 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2840 * If a host as already performed a random delay
2841 * [...] as part of DAD [...] there is no need
2842 * to delay again before sending the first RS
2844 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2846 spin_lock_bh(&ifp->lock);
2848 ifp->idev->if_flags |= IF_RS_SENT;
2849 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2850 spin_unlock_bh(&ifp->lock);
2854 static void addrconf_dad_run(struct inet6_dev *idev) {
2855 struct inet6_ifaddr *ifp;
2857 read_lock_bh(&idev->lock);
2858 for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2859 spin_lock_bh(&ifp->lock);
2860 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2861 spin_unlock_bh(&ifp->lock);
2864 spin_unlock_bh(&ifp->lock);
2865 addrconf_dad_kick(ifp);
2867 read_unlock_bh(&idev->lock);
2870 #ifdef CONFIG_PROC_FS
2871 struct if6_iter_state {
2872 struct seq_net_private p;
2876 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2878 struct inet6_ifaddr *ifa = NULL;
2879 struct if6_iter_state *state = seq->private;
2880 struct net *net = seq_file_net(seq);
2882 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2883 ifa = inet6_addr_lst[state->bucket];
2885 while (ifa && !net_eq(dev_net(ifa->idev->dev), net))
2886 ifa = ifa->lst_next;
2893 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2895 struct if6_iter_state *state = seq->private;
2896 struct net *net = seq_file_net(seq);
2898 ifa = ifa->lst_next;
2901 if (!net_eq(dev_net(ifa->idev->dev), net)) {
2902 ifa = ifa->lst_next;
2907 if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2908 ifa = inet6_addr_lst[state->bucket];
2915 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2917 struct inet6_ifaddr *ifa = if6_get_first(seq);
2920 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2922 return pos ? NULL : ifa;
2925 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2926 __acquires(addrconf_hash_lock)
2928 read_lock_bh(&addrconf_hash_lock);
2929 return if6_get_idx(seq, *pos);
2932 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2934 struct inet6_ifaddr *ifa;
2936 ifa = if6_get_next(seq, v);
2941 static void if6_seq_stop(struct seq_file *seq, void *v)
2942 __releases(addrconf_hash_lock)
2944 read_unlock_bh(&addrconf_hash_lock);
2947 static int if6_seq_show(struct seq_file *seq, void *v)
2949 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
2951 NIP6_SEQFMT " %02x %02x %02x %02x %8s\n",
2953 ifp->idev->dev->ifindex,
2957 ifp->idev->dev->name);
2961 static const struct seq_operations if6_seq_ops = {
2962 .start = if6_seq_start,
2963 .next = if6_seq_next,
2964 .show = if6_seq_show,
2965 .stop = if6_seq_stop,
2968 static int if6_seq_open(struct inode *inode, struct file *file)
2970 return seq_open_net(inode, file, &if6_seq_ops,
2971 sizeof(struct if6_iter_state));
2974 static const struct file_operations if6_fops = {
2975 .owner = THIS_MODULE,
2976 .open = if6_seq_open,
2978 .llseek = seq_lseek,
2979 .release = seq_release_net,
2982 static int if6_proc_net_init(struct net *net)
2984 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
2989 static void if6_proc_net_exit(struct net *net)
2991 proc_net_remove(net, "if_inet6");
2994 static struct pernet_operations if6_proc_net_ops = {
2995 .init = if6_proc_net_init,
2996 .exit = if6_proc_net_exit,
2999 int __init if6_proc_init(void)
3001 return register_pernet_subsys(&if6_proc_net_ops);
3004 void if6_proc_exit(void)
3006 unregister_pernet_subsys(&if6_proc_net_ops);
3008 #endif /* CONFIG_PROC_FS */
3010 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3011 /* Check if address is a home address configured on any interface. */
3012 int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
3015 struct inet6_ifaddr * ifp;
3016 u8 hash = ipv6_addr_hash(addr);
3017 read_lock_bh(&addrconf_hash_lock);
3018 for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
3019 if (!net_eq(dev_net(ifp->idev->dev), net))
3021 if (ipv6_addr_equal(&ifp->addr, addr) &&
3022 (ifp->flags & IFA_F_HOMEADDRESS)) {
3027 read_unlock_bh(&addrconf_hash_lock);
3033 * Periodic address status verification
3036 static void addrconf_verify(unsigned long foo)
3038 struct inet6_ifaddr *ifp;
3039 unsigned long now, next;
3042 spin_lock_bh(&addrconf_verify_lock);
3044 next = now + ADDR_CHECK_FREQUENCY;
3046 del_timer(&addr_chk_timer);
3048 for (i=0; i < IN6_ADDR_HSIZE; i++) {
3051 read_lock(&addrconf_hash_lock);
3052 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
3054 #ifdef CONFIG_IPV6_PRIVACY
3055 unsigned long regen_advance;
3058 if (ifp->flags & IFA_F_PERMANENT)
3061 spin_lock(&ifp->lock);
3062 age = (now - ifp->tstamp) / HZ;
3064 #ifdef CONFIG_IPV6_PRIVACY
3065 regen_advance = ifp->idev->cnf.regen_max_retry *
3066 ifp->idev->cnf.dad_transmits *
3067 ifp->idev->nd_parms->retrans_time / HZ;
3070 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3071 age >= ifp->valid_lft) {
3072 spin_unlock(&ifp->lock);
3074 read_unlock(&addrconf_hash_lock);
3077 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3078 spin_unlock(&ifp->lock);
3080 } else if (age >= ifp->prefered_lft) {
3081 /* jiffies - ifp->tsamp > age >= ifp->prefered_lft */
3084 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3086 ifp->flags |= IFA_F_DEPRECATED;
3089 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3090 next = ifp->tstamp + ifp->valid_lft * HZ;
3092 spin_unlock(&ifp->lock);
3096 read_unlock(&addrconf_hash_lock);
3098 ipv6_ifa_notify(0, ifp);
3102 #ifdef CONFIG_IPV6_PRIVACY
3103 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3104 !(ifp->flags&IFA_F_TENTATIVE)) {
3105 if (age >= ifp->prefered_lft - regen_advance) {
3106 struct inet6_ifaddr *ifpub = ifp->ifpub;
3107 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3108 next = ifp->tstamp + ifp->prefered_lft * HZ;
3109 if (!ifp->regen_count && ifpub) {
3112 in6_ifa_hold(ifpub);
3113 spin_unlock(&ifp->lock);
3114 read_unlock(&addrconf_hash_lock);
3115 spin_lock(&ifpub->lock);
3116 ifpub->regen_count = 0;
3117 spin_unlock(&ifpub->lock);
3118 ipv6_create_tempaddr(ifpub, ifp);
3123 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3124 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3125 spin_unlock(&ifp->lock);
3128 /* ifp->prefered_lft <= ifp->valid_lft */
3129 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3130 next = ifp->tstamp + ifp->prefered_lft * HZ;
3131 spin_unlock(&ifp->lock);
3134 read_unlock(&addrconf_hash_lock);
3137 addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
3138 add_timer(&addr_chk_timer);
3139 spin_unlock_bh(&addrconf_verify_lock);
3142 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3144 struct in6_addr *pfx = NULL;
3147 pfx = nla_data(addr);
3150 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3153 pfx = nla_data(local);
3159 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3160 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3161 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3162 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3166 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3168 struct net *net = sock_net(skb->sk);
3169 struct ifaddrmsg *ifm;
3170 struct nlattr *tb[IFA_MAX+1];
3171 struct in6_addr *pfx;
3174 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3178 ifm = nlmsg_data(nlh);
3179 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3183 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3186 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3187 u32 prefered_lft, u32 valid_lft)
3191 unsigned long timeout;
3193 if (!valid_lft || (prefered_lft > valid_lft))
3196 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3197 if (addrconf_finite_timeout(timeout)) {
3198 expires = jiffies_to_clock_t(timeout * HZ);
3199 valid_lft = timeout;
3200 flags = RTF_EXPIRES;
3204 ifa_flags |= IFA_F_PERMANENT;
3207 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3208 if (addrconf_finite_timeout(timeout)) {
3210 ifa_flags |= IFA_F_DEPRECATED;
3211 prefered_lft = timeout;
3214 spin_lock_bh(&ifp->lock);
3215 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3216 ifp->tstamp = jiffies;
3217 ifp->valid_lft = valid_lft;
3218 ifp->prefered_lft = prefered_lft;
3220 spin_unlock_bh(&ifp->lock);
3221 if (!(ifp->flags&IFA_F_TENTATIVE))
3222 ipv6_ifa_notify(0, ifp);
3224 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3232 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3234 struct net *net = sock_net(skb->sk);
3235 struct ifaddrmsg *ifm;
3236 struct nlattr *tb[IFA_MAX+1];
3237 struct in6_addr *pfx;
3238 struct inet6_ifaddr *ifa;
3239 struct net_device *dev;
3240 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3244 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3248 ifm = nlmsg_data(nlh);
3249 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3253 if (tb[IFA_CACHEINFO]) {
3254 struct ifa_cacheinfo *ci;
3256 ci = nla_data(tb[IFA_CACHEINFO]);
3257 valid_lft = ci->ifa_valid;
3258 preferred_lft = ci->ifa_prefered;
3260 preferred_lft = INFINITY_LIFE_TIME;
3261 valid_lft = INFINITY_LIFE_TIME;
3264 dev = __dev_get_by_index(net, ifm->ifa_index);
3268 /* We ignore other flags so far. */
3269 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3271 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3274 * It would be best to check for !NLM_F_CREATE here but
3275 * userspace alreay relies on not having to provide this.
3277 return inet6_addr_add(net, ifm->ifa_index, pfx,
3278 ifm->ifa_prefixlen, ifa_flags,
3279 preferred_lft, valid_lft);
3282 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3283 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3286 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3293 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3294 u8 scope, int ifindex)
3296 struct ifaddrmsg *ifm;
3298 ifm = nlmsg_data(nlh);
3299 ifm->ifa_family = AF_INET6;
3300 ifm->ifa_prefixlen = prefixlen;
3301 ifm->ifa_flags = flags;
3302 ifm->ifa_scope = scope;
3303 ifm->ifa_index = ifindex;
3306 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3307 unsigned long tstamp, u32 preferred, u32 valid)
3309 struct ifa_cacheinfo ci;
3311 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3312 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3313 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3314 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3315 ci.ifa_prefered = preferred;
3316 ci.ifa_valid = valid;
3318 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3321 static inline int rt_scope(int ifa_scope)
3323 if (ifa_scope & IFA_HOST)
3324 return RT_SCOPE_HOST;
3325 else if (ifa_scope & IFA_LINK)
3326 return RT_SCOPE_LINK;
3327 else if (ifa_scope & IFA_SITE)
3328 return RT_SCOPE_SITE;
3330 return RT_SCOPE_UNIVERSE;
3333 static inline int inet6_ifaddr_msgsize(void)
3335 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3336 + nla_total_size(16) /* IFA_ADDRESS */
3337 + nla_total_size(sizeof(struct ifa_cacheinfo));
3340 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3341 u32 pid, u32 seq, int event, unsigned int flags)
3343 struct nlmsghdr *nlh;
3344 u32 preferred, valid;
3346 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3350 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3351 ifa->idev->dev->ifindex);
3353 if (!(ifa->flags&IFA_F_PERMANENT)) {
3354 preferred = ifa->prefered_lft;
3355 valid = ifa->valid_lft;
3356 if (preferred != INFINITY_LIFE_TIME) {
3357 long tval = (jiffies - ifa->tstamp)/HZ;
3359 if (valid != INFINITY_LIFE_TIME)
3363 preferred = INFINITY_LIFE_TIME;
3364 valid = INFINITY_LIFE_TIME;
3367 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3368 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3369 nlmsg_cancel(skb, nlh);
3373 return nlmsg_end(skb, nlh);
3376 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3377 u32 pid, u32 seq, int event, u16 flags)
3379 struct nlmsghdr *nlh;
3380 u8 scope = RT_SCOPE_UNIVERSE;
3381 int ifindex = ifmca->idev->dev->ifindex;
3383 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3384 scope = RT_SCOPE_SITE;
3386 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3390 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3391 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3392 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3393 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3394 nlmsg_cancel(skb, nlh);
3398 return nlmsg_end(skb, nlh);
3401 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3402 u32 pid, u32 seq, int event, unsigned int flags)
3404 struct nlmsghdr *nlh;
3405 u8 scope = RT_SCOPE_UNIVERSE;
3406 int ifindex = ifaca->aca_idev->dev->ifindex;
3408 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3409 scope = RT_SCOPE_SITE;
3411 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3415 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3416 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3417 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3418 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3419 nlmsg_cancel(skb, nlh);
3423 return nlmsg_end(skb, nlh);
3433 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3434 enum addr_type_t type)
3437 int s_idx, s_ip_idx;
3439 struct net_device *dev;
3440 struct inet6_dev *idev = NULL;
3441 struct inet6_ifaddr *ifa;
3442 struct ifmcaddr6 *ifmca;
3443 struct ifacaddr6 *ifaca;
3444 struct net *net = sock_net(skb->sk);
3446 s_idx = cb->args[0];
3447 s_ip_idx = ip_idx = cb->args[1];
3450 for_each_netdev(net, dev) {
3456 if ((idev = in6_dev_get(dev)) == NULL)
3458 read_lock_bh(&idev->lock);
3461 /* unicast address incl. temp addr */
3462 for (ifa = idev->addr_list; ifa;
3463 ifa = ifa->if_next, ip_idx++) {
3464 if (ip_idx < s_ip_idx)
3466 err = inet6_fill_ifaddr(skb, ifa,
3467 NETLINK_CB(cb->skb).pid,
3473 case MULTICAST_ADDR:
3474 /* multicast address */
3475 for (ifmca = idev->mc_list; ifmca;
3476 ifmca = ifmca->next, ip_idx++) {
3477 if (ip_idx < s_ip_idx)
3479 err = inet6_fill_ifmcaddr(skb, ifmca,
3480 NETLINK_CB(cb->skb).pid,
3487 /* anycast address */
3488 for (ifaca = idev->ac_list; ifaca;
3489 ifaca = ifaca->aca_next, ip_idx++) {
3490 if (ip_idx < s_ip_idx)
3492 err = inet6_fill_ifacaddr(skb, ifaca,
3493 NETLINK_CB(cb->skb).pid,
3502 read_unlock_bh(&idev->lock);
3511 cb->args[1] = ip_idx;
3515 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3517 enum addr_type_t type = UNICAST_ADDR;
3519 return inet6_dump_addr(skb, cb, type);
3522 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3524 enum addr_type_t type = MULTICAST_ADDR;
3526 return inet6_dump_addr(skb, cb, type);
3530 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3532 enum addr_type_t type = ANYCAST_ADDR;
3534 return inet6_dump_addr(skb, cb, type);
3537 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3540 struct net *net = sock_net(in_skb->sk);
3541 struct ifaddrmsg *ifm;
3542 struct nlattr *tb[IFA_MAX+1];
3543 struct in6_addr *addr = NULL;
3544 struct net_device *dev = NULL;
3545 struct inet6_ifaddr *ifa;
3546 struct sk_buff *skb;
3549 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3553 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3559 ifm = nlmsg_data(nlh);
3561 dev = __dev_get_by_index(net, ifm->ifa_index);
3563 if ((ifa = ipv6_get_ifaddr(net, addr, dev, 1)) == NULL) {
3564 err = -EADDRNOTAVAIL;
3568 if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
3573 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3574 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3576 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3577 WARN_ON(err == -EMSGSIZE);
3581 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
3588 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3590 struct sk_buff *skb;
3591 struct net *net = dev_net(ifa->idev->dev);
3594 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3598 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3600 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3601 WARN_ON(err == -EMSGSIZE);
3605 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3608 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3611 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3612 __s32 *array, int bytes)
3614 BUG_ON(bytes < (DEVCONF_MAX * 4));
3616 memset(array, 0, bytes);
3617 array[DEVCONF_FORWARDING] = cnf->forwarding;
3618 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3619 array[DEVCONF_MTU6] = cnf->mtu6;
3620 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3621 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3622 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3623 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3624 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3625 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3626 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3627 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3628 #ifdef CONFIG_IPV6_PRIVACY
3629 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3630 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3631 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3632 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3633 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3635 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3636 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3637 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3638 #ifdef CONFIG_IPV6_ROUTER_PREF
3639 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3640 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3641 #ifdef CONFIG_IPV6_ROUTE_INFO
3642 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3645 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3646 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3647 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3648 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3650 #ifdef CONFIG_IPV6_MROUTE
3651 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3655 static inline size_t inet6_if_nlmsg_size(void)
3657 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3658 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3659 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3660 + nla_total_size(4) /* IFLA_MTU */
3661 + nla_total_size(4) /* IFLA_LINK */
3662 + nla_total_size( /* IFLA_PROTINFO */
3663 nla_total_size(4) /* IFLA_INET6_FLAGS */
3664 + nla_total_size(sizeof(struct ifla_cacheinfo))
3665 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3666 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3667 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
3671 static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
3675 int pad = bytes - sizeof(u64) * items;
3678 /* Use put_unaligned() because stats may not be aligned for u64. */
3679 put_unaligned(items, &stats[0]);
3680 for (i = 1; i < items; i++)
3681 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3683 memset(&stats[items], 0, pad);
3686 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3690 case IFLA_INET6_STATS:
3691 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3693 case IFLA_INET6_ICMP6STATS:
3694 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3699 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3700 u32 pid, u32 seq, int event, unsigned int flags)
3702 struct net_device *dev = idev->dev;
3704 struct ifinfomsg *hdr;
3705 struct nlmsghdr *nlh;
3707 struct ifla_cacheinfo ci;
3709 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3713 hdr = nlmsg_data(nlh);
3714 hdr->ifi_family = AF_INET6;
3716 hdr->ifi_type = dev->type;
3717 hdr->ifi_index = dev->ifindex;
3718 hdr->ifi_flags = dev_get_flags(dev);
3719 hdr->ifi_change = 0;
3721 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3724 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3726 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3727 if (dev->ifindex != dev->iflink)
3728 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3730 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3731 if (protoinfo == NULL)
3732 goto nla_put_failure;
3734 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3736 ci.max_reasm_len = IPV6_MAXPLEN;
3737 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3738 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3739 ci.reachable_time = idev->nd_parms->reachable_time;
3740 ci.retrans_time = idev->nd_parms->retrans_time;
3741 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3743 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3745 goto nla_put_failure;
3746 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3748 /* XXX - MC not implemented */
3750 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3752 goto nla_put_failure;
3753 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3755 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3757 goto nla_put_failure;
3758 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3760 nla_nest_end(skb, protoinfo);
3761 return nlmsg_end(skb, nlh);
3764 nlmsg_cancel(skb, nlh);
3768 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3770 struct net *net = sock_net(skb->sk);
3772 int s_idx = cb->args[0];
3773 struct net_device *dev;
3774 struct inet6_dev *idev;
3776 read_lock(&dev_base_lock);
3778 for_each_netdev(net, dev) {
3781 if ((idev = in6_dev_get(dev)) == NULL)
3783 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3784 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3791 read_unlock(&dev_base_lock);
3797 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3799 struct sk_buff *skb;
3800 struct net *net = dev_net(idev->dev);
3803 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
3807 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
3809 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3810 WARN_ON(err == -EMSGSIZE);
3814 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3817 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3820 static inline size_t inet6_prefix_nlmsg_size(void)
3822 return NLMSG_ALIGN(sizeof(struct prefixmsg))
3823 + nla_total_size(sizeof(struct in6_addr))
3824 + nla_total_size(sizeof(struct prefix_cacheinfo));
3827 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3828 struct prefix_info *pinfo, u32 pid, u32 seq,
3829 int event, unsigned int flags)
3831 struct prefixmsg *pmsg;
3832 struct nlmsghdr *nlh;
3833 struct prefix_cacheinfo ci;
3835 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3839 pmsg = nlmsg_data(nlh);
3840 pmsg->prefix_family = AF_INET6;
3841 pmsg->prefix_pad1 = 0;
3842 pmsg->prefix_pad2 = 0;
3843 pmsg->prefix_ifindex = idev->dev->ifindex;
3844 pmsg->prefix_len = pinfo->prefix_len;
3845 pmsg->prefix_type = pinfo->type;
3846 pmsg->prefix_pad3 = 0;
3847 pmsg->prefix_flags = 0;
3849 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3850 if (pinfo->autoconf)
3851 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3853 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3855 ci.preferred_time = ntohl(pinfo->prefered);
3856 ci.valid_time = ntohl(pinfo->valid);
3857 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3859 return nlmsg_end(skb, nlh);
3862 nlmsg_cancel(skb, nlh);
3866 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3867 struct prefix_info *pinfo)
3869 struct sk_buff *skb;
3870 struct net *net = dev_net(idev->dev);
3873 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
3877 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
3879 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3880 WARN_ON(err == -EMSGSIZE);
3884 err = rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3887 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
3890 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3892 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3897 * If the address was optimistic
3898 * we inserted the route at the start of
3899 * our DAD process, so we don't need
3902 if (!(ifp->rt->rt6i_node))
3903 ip6_ins_rt(ifp->rt);
3904 if (ifp->idev->cnf.forwarding)
3905 addrconf_join_anycast(ifp);
3908 if (ifp->idev->cnf.forwarding)
3909 addrconf_leave_anycast(ifp);
3910 addrconf_leave_solict(ifp->idev, &ifp->addr);
3911 dst_hold(&ifp->rt->u.dst);
3912 if (ip6_del_rt(ifp->rt))
3913 dst_free(&ifp->rt->u.dst);
3918 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3921 if (likely(ifp->idev->dead == 0))
3922 __ipv6_ifa_notify(event, ifp);
3923 rcu_read_unlock_bh();
3926 #ifdef CONFIG_SYSCTL
3929 int addrconf_sysctl_forward(ctl_table *ctl, int write, struct file * filp,
3930 void __user *buffer, size_t *lenp, loff_t *ppos)
3932 int *valp = ctl->data;
3936 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
3939 addrconf_fixup_forwarding(ctl, valp, val);
3943 static int addrconf_sysctl_forward_strategy(ctl_table *table,
3944 int __user *name, int nlen,
3945 void __user *oldval,
3946 size_t __user *oldlenp,
3947 void __user *newval, size_t newlen)
3949 int *valp = table->data;
3953 if (!newval || !newlen)
3955 if (newlen != sizeof(int))
3957 if (get_user(new, (int __user *)newval))
3961 if (oldval && oldlenp) {
3963 if (get_user(len, oldlenp))
3966 if (len > table->maxlen)
3967 len = table->maxlen;
3968 if (copy_to_user(oldval, valp, len))
3970 if (put_user(len, oldlenp))
3976 addrconf_fixup_forwarding(table, valp, val);
3980 static struct addrconf_sysctl_table
3982 struct ctl_table_header *sysctl_header;
3983 ctl_table addrconf_vars[DEVCONF_MAX+1];
3985 } addrconf_sysctl __read_mostly = {
3986 .sysctl_header = NULL,
3989 .ctl_name = NET_IPV6_FORWARDING,
3990 .procname = "forwarding",
3991 .data = &ipv6_devconf.forwarding,
3992 .maxlen = sizeof(int),
3994 .proc_handler = &addrconf_sysctl_forward,
3995 .strategy = &addrconf_sysctl_forward_strategy,
3998 .ctl_name = NET_IPV6_HOP_LIMIT,
3999 .procname = "hop_limit",
4000 .data = &ipv6_devconf.hop_limit,
4001 .maxlen = sizeof(int),
4003 .proc_handler = proc_dointvec,
4006 .ctl_name = NET_IPV6_MTU,
4008 .data = &ipv6_devconf.mtu6,
4009 .maxlen = sizeof(int),
4011 .proc_handler = &proc_dointvec,
4014 .ctl_name = NET_IPV6_ACCEPT_RA,
4015 .procname = "accept_ra",
4016 .data = &ipv6_devconf.accept_ra,
4017 .maxlen = sizeof(int),
4019 .proc_handler = &proc_dointvec,
4022 .ctl_name = NET_IPV6_ACCEPT_REDIRECTS,
4023 .procname = "accept_redirects",
4024 .data = &ipv6_devconf.accept_redirects,
4025 .maxlen = sizeof(int),
4027 .proc_handler = &proc_dointvec,
4030 .ctl_name = NET_IPV6_AUTOCONF,
4031 .procname = "autoconf",
4032 .data = &ipv6_devconf.autoconf,
4033 .maxlen = sizeof(int),
4035 .proc_handler = &proc_dointvec,
4038 .ctl_name = NET_IPV6_DAD_TRANSMITS,
4039 .procname = "dad_transmits",
4040 .data = &ipv6_devconf.dad_transmits,
4041 .maxlen = sizeof(int),
4043 .proc_handler = &proc_dointvec,
4046 .ctl_name = NET_IPV6_RTR_SOLICITS,
4047 .procname = "router_solicitations",
4048 .data = &ipv6_devconf.rtr_solicits,
4049 .maxlen = sizeof(int),
4051 .proc_handler = &proc_dointvec,
4054 .ctl_name = NET_IPV6_RTR_SOLICIT_INTERVAL,
4055 .procname = "router_solicitation_interval",
4056 .data = &ipv6_devconf.rtr_solicit_interval,
4057 .maxlen = sizeof(int),
4059 .proc_handler = &proc_dointvec_jiffies,
4060 .strategy = &sysctl_jiffies,
4063 .ctl_name = NET_IPV6_RTR_SOLICIT_DELAY,
4064 .procname = "router_solicitation_delay",
4065 .data = &ipv6_devconf.rtr_solicit_delay,
4066 .maxlen = sizeof(int),
4068 .proc_handler = &proc_dointvec_jiffies,
4069 .strategy = &sysctl_jiffies,
4072 .ctl_name = NET_IPV6_FORCE_MLD_VERSION,
4073 .procname = "force_mld_version",
4074 .data = &ipv6_devconf.force_mld_version,
4075 .maxlen = sizeof(int),
4077 .proc_handler = &proc_dointvec,
4079 #ifdef CONFIG_IPV6_PRIVACY
4081 .ctl_name = NET_IPV6_USE_TEMPADDR,
4082 .procname = "use_tempaddr",
4083 .data = &ipv6_devconf.use_tempaddr,
4084 .maxlen = sizeof(int),
4086 .proc_handler = &proc_dointvec,
4089 .ctl_name = NET_IPV6_TEMP_VALID_LFT,
4090 .procname = "temp_valid_lft",
4091 .data = &ipv6_devconf.temp_valid_lft,
4092 .maxlen = sizeof(int),
4094 .proc_handler = &proc_dointvec,
4097 .ctl_name = NET_IPV6_TEMP_PREFERED_LFT,
4098 .procname = "temp_prefered_lft",
4099 .data = &ipv6_devconf.temp_prefered_lft,
4100 .maxlen = sizeof(int),
4102 .proc_handler = &proc_dointvec,
4105 .ctl_name = NET_IPV6_REGEN_MAX_RETRY,
4106 .procname = "regen_max_retry",
4107 .data = &ipv6_devconf.regen_max_retry,
4108 .maxlen = sizeof(int),
4110 .proc_handler = &proc_dointvec,
4113 .ctl_name = NET_IPV6_MAX_DESYNC_FACTOR,
4114 .procname = "max_desync_factor",
4115 .data = &ipv6_devconf.max_desync_factor,
4116 .maxlen = sizeof(int),
4118 .proc_handler = &proc_dointvec,
4122 .ctl_name = NET_IPV6_MAX_ADDRESSES,
4123 .procname = "max_addresses",
4124 .data = &ipv6_devconf.max_addresses,
4125 .maxlen = sizeof(int),
4127 .proc_handler = &proc_dointvec,
4130 .ctl_name = NET_IPV6_ACCEPT_RA_DEFRTR,
4131 .procname = "accept_ra_defrtr",
4132 .data = &ipv6_devconf.accept_ra_defrtr,
4133 .maxlen = sizeof(int),
4135 .proc_handler = &proc_dointvec,
4138 .ctl_name = NET_IPV6_ACCEPT_RA_PINFO,
4139 .procname = "accept_ra_pinfo",
4140 .data = &ipv6_devconf.accept_ra_pinfo,
4141 .maxlen = sizeof(int),
4143 .proc_handler = &proc_dointvec,
4145 #ifdef CONFIG_IPV6_ROUTER_PREF
4147 .ctl_name = NET_IPV6_ACCEPT_RA_RTR_PREF,
4148 .procname = "accept_ra_rtr_pref",
4149 .data = &ipv6_devconf.accept_ra_rtr_pref,
4150 .maxlen = sizeof(int),
4152 .proc_handler = &proc_dointvec,
4155 .ctl_name = NET_IPV6_RTR_PROBE_INTERVAL,
4156 .procname = "router_probe_interval",
4157 .data = &ipv6_devconf.rtr_probe_interval,
4158 .maxlen = sizeof(int),
4160 .proc_handler = &proc_dointvec_jiffies,
4161 .strategy = &sysctl_jiffies,
4163 #ifdef CONFIG_IPV6_ROUTE_INFO
4165 .ctl_name = NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
4166 .procname = "accept_ra_rt_info_max_plen",
4167 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4168 .maxlen = sizeof(int),
4170 .proc_handler = &proc_dointvec,
4175 .ctl_name = NET_IPV6_PROXY_NDP,
4176 .procname = "proxy_ndp",
4177 .data = &ipv6_devconf.proxy_ndp,
4178 .maxlen = sizeof(int),
4180 .proc_handler = &proc_dointvec,
4183 .ctl_name = NET_IPV6_ACCEPT_SOURCE_ROUTE,
4184 .procname = "accept_source_route",
4185 .data = &ipv6_devconf.accept_source_route,
4186 .maxlen = sizeof(int),
4188 .proc_handler = &proc_dointvec,
4190 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4192 .ctl_name = CTL_UNNUMBERED,
4193 .procname = "optimistic_dad",
4194 .data = &ipv6_devconf.optimistic_dad,
4195 .maxlen = sizeof(int),
4197 .proc_handler = &proc_dointvec,
4201 #ifdef CONFIG_IPV6_MROUTE
4203 .ctl_name = CTL_UNNUMBERED,
4204 .procname = "mc_forwarding",
4205 .data = &ipv6_devconf.mc_forwarding,
4206 .maxlen = sizeof(int),
4208 .proc_handler = &proc_dointvec,
4212 .ctl_name = 0, /* sentinel */
4217 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4218 int ctl_name, struct inet6_dev *idev, struct ipv6_devconf *p)
4221 struct addrconf_sysctl_table *t;
4223 #define ADDRCONF_CTL_PATH_DEV 3
4225 struct ctl_path addrconf_ctl_path[] = {
4226 { .procname = "net", .ctl_name = CTL_NET, },
4227 { .procname = "ipv6", .ctl_name = NET_IPV6, },
4228 { .procname = "conf", .ctl_name = NET_IPV6_CONF, },
4229 { /* to be set */ },
4234 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4238 for (i=0; t->addrconf_vars[i].data; i++) {
4239 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
4240 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4241 t->addrconf_vars[i].extra2 = net;
4245 * Make a copy of dev_name, because '.procname' is regarded as const
4246 * by sysctl and we wouldn't want anyone to change it under our feet
4247 * (see SIOCSIFNAME).
4249 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4253 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4254 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].ctl_name = ctl_name;
4256 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4258 if (t->sysctl_header == NULL)
4272 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4274 struct addrconf_sysctl_table *t;
4276 if (p->sysctl == NULL)
4281 unregister_sysctl_table(t->sysctl_header);
4286 static void addrconf_sysctl_register(struct inet6_dev *idev)
4288 neigh_sysctl_register(idev->dev, idev->nd_parms, NET_IPV6,
4289 NET_IPV6_NEIGH, "ipv6",
4290 &ndisc_ifinfo_sysctl_change,
4291 ndisc_ifinfo_sysctl_strategy);
4292 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4293 idev->dev->ifindex, idev, &idev->cnf);
4296 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4298 __addrconf_sysctl_unregister(&idev->cnf);
4299 neigh_sysctl_unregister(idev->nd_parms);
4305 static int addrconf_init_net(struct net *net)
4308 struct ipv6_devconf *all, *dflt;
4311 all = &ipv6_devconf;
4312 dflt = &ipv6_devconf_dflt;
4314 if (net != &init_net) {
4315 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4319 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4321 goto err_alloc_dflt;
4324 net->ipv6.devconf_all = all;
4325 net->ipv6.devconf_dflt = dflt;
4327 #ifdef CONFIG_SYSCTL
4328 err = __addrconf_sysctl_register(net, "all", NET_PROTO_CONF_ALL,
4333 err = __addrconf_sysctl_register(net, "default", NET_PROTO_CONF_DEFAULT,
4340 #ifdef CONFIG_SYSCTL
4342 __addrconf_sysctl_unregister(all);
4352 static void addrconf_exit_net(struct net *net)
4354 #ifdef CONFIG_SYSCTL
4355 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4356 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4358 if (net != &init_net) {
4359 kfree(net->ipv6.devconf_dflt);
4360 kfree(net->ipv6.devconf_all);
4364 static struct pernet_operations addrconf_ops = {
4365 .init = addrconf_init_net,
4366 .exit = addrconf_exit_net,
4373 int register_inet6addr_notifier(struct notifier_block *nb)
4375 return atomic_notifier_chain_register(&inet6addr_chain, nb);
4378 EXPORT_SYMBOL(register_inet6addr_notifier);
4380 int unregister_inet6addr_notifier(struct notifier_block *nb)
4382 return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
4385 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4387 static void addrconf_net_exit(struct net *net)
4389 struct net_device *dev;
4392 /* clean dev list */
4393 for_each_netdev(net, dev) {
4394 if (__in6_dev_get(dev) == NULL)
4396 addrconf_ifdown(dev, 1);
4398 addrconf_ifdown(net->loopback_dev, 2);
4402 static struct pernet_operations addrconf_net_ops = {
4403 .exit = addrconf_net_exit,
4407 * Init / cleanup code
4410 int __init addrconf_init(void)
4414 if ((err = ipv6_addr_label_init()) < 0) {
4415 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n",
4420 register_pernet_subsys(&addrconf_ops);
4422 /* The addrconf netdev notifier requires that loopback_dev
4423 * has it's ipv6 private information allocated and setup
4424 * before it can bring up and give link-local addresses
4425 * to other devices which are up.
4427 * Unfortunately, loopback_dev is not necessarily the first
4428 * entry in the global dev_base list of net devices. In fact,
4429 * it is likely to be the very last entry on that list.
4430 * So this causes the notifier registry below to try and
4431 * give link-local addresses to all devices besides loopback_dev
4432 * first, then loopback_dev, which cases all the non-loopback_dev
4433 * devices to fail to get a link-local address.
4435 * So, as a temporary fix, allocate the ipv6 structure for
4436 * loopback_dev first by hand.
4437 * Longer term, all of the dependencies ipv6 has upon the loopback
4438 * device and it being up should be removed.
4441 if (!ipv6_add_dev(init_net.loopback_dev))
4447 err = register_pernet_device(&addrconf_net_ops);
4451 register_netdevice_notifier(&ipv6_dev_notf);
4455 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4459 /* Only the first call to __rtnl_register can fail */
4460 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4461 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4462 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4463 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4464 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4466 ipv6_addr_label_rtnl_register();
4470 unregister_netdevice_notifier(&ipv6_dev_notf);
4472 unregister_pernet_subsys(&addrconf_ops);
4477 void addrconf_cleanup(void)
4479 struct inet6_ifaddr *ifa;
4482 unregister_netdevice_notifier(&ipv6_dev_notf);
4483 unregister_pernet_device(&addrconf_net_ops);
4485 unregister_pernet_subsys(&addrconf_ops);
4492 write_lock_bh(&addrconf_hash_lock);
4493 for (i=0; i < IN6_ADDR_HSIZE; i++) {
4494 for (ifa=inet6_addr_lst[i]; ifa; ) {
4495 struct inet6_ifaddr *bifa;
4498 ifa = ifa->lst_next;
4499 printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4500 /* Do not free it; something is wrong.
4501 Now we can investigate it with debugger.
4505 write_unlock_bh(&addrconf_hash_lock);
4507 del_timer(&addr_chk_timer);
4510 unregister_pernet_subsys(&addrconf_net_ops);