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 #define pr_fmt(fmt) "IPv6: " fmt
43 #include <linux/errno.h>
44 #include <linux/types.h>
45 #include <linux/kernel.h>
46 #include <linux/socket.h>
47 #include <linux/sockios.h>
48 #include <linux/net.h>
49 #include <linux/in6.h>
50 #include <linux/netdevice.h>
51 #include <linux/if_addr.h>
52 #include <linux/if_arp.h>
53 #include <linux/if_arcnet.h>
54 #include <linux/if_infiniband.h>
55 #include <linux/route.h>
56 #include <linux/inetdevice.h>
57 #include <linux/init.h>
58 #include <linux/slab.h>
60 #include <linux/sysctl.h>
62 #include <linux/capability.h>
63 #include <linux/delay.h>
64 #include <linux/notifier.h>
65 #include <linux/string.h>
66 #include <linux/hash.h>
68 #include <net/net_namespace.h>
72 #include <net/af_ieee802154.h>
74 #include <net/protocol.h>
75 #include <net/ndisc.h>
76 #include <net/ip6_route.h>
77 #include <net/addrconf.h>
80 #include <net/netlink.h>
81 #include <net/pkt_sched.h>
82 #include <linux/if_tunnel.h>
83 #include <linux/rtnetlink.h>
84 #include <linux/netconf.h>
86 #ifdef CONFIG_IPV6_PRIVACY
87 #include <linux/random.h>
90 #include <linux/uaccess.h>
91 #include <asm/unaligned.h>
93 #include <linux/proc_fs.h>
94 #include <linux/seq_file.h>
95 #include <linux/export.h>
97 /* Set to 3 to get tracing... */
101 #define ADBG(x) printk x
106 #define INFINITY_LIFE_TIME 0xFFFFFFFF
108 static inline u32 cstamp_delta(unsigned long cstamp)
110 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
113 #define ADDRCONF_TIMER_FUZZ_MINUS (HZ > 50 ? HZ/50 : 1)
114 #define ADDRCONF_TIMER_FUZZ (HZ / 4)
115 #define ADDRCONF_TIMER_FUZZ_MAX (HZ)
118 static void addrconf_sysctl_register(struct inet6_dev *idev);
119 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
121 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
125 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
130 #ifdef CONFIG_IPV6_PRIVACY
131 static void __ipv6_regen_rndid(struct inet6_dev *idev);
132 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
133 static void ipv6_regen_rndid(unsigned long data);
136 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
137 static int ipv6_count_addresses(struct inet6_dev *idev);
140 * Configured unicast address hash table
142 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
143 static DEFINE_SPINLOCK(addrconf_hash_lock);
145 static void addrconf_verify(unsigned long);
147 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
148 static DEFINE_SPINLOCK(addrconf_verify_lock);
150 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
151 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
153 static void addrconf_type_change(struct net_device *dev,
154 unsigned long event);
155 static int addrconf_ifdown(struct net_device *dev, int how);
157 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
159 const struct net_device *dev,
160 u32 flags, u32 noflags);
162 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
163 static void addrconf_dad_timer(unsigned long data);
164 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
165 static void addrconf_dad_run(struct inet6_dev *idev);
166 static void addrconf_rs_timer(unsigned long data);
167 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
168 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
170 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
171 struct prefix_info *pinfo);
172 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
173 struct net_device *dev);
175 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
177 static struct ipv6_devconf ipv6_devconf __read_mostly = {
179 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
180 .mtu6 = IPV6_MIN_MTU,
182 .accept_redirects = 1,
184 .force_mld_version = 0,
186 .rtr_solicits = MAX_RTR_SOLICITATIONS,
187 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
188 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
189 #ifdef CONFIG_IPV6_PRIVACY
191 .temp_valid_lft = TEMP_VALID_LIFETIME,
192 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
193 .regen_max_retry = REGEN_MAX_RETRY,
194 .max_desync_factor = MAX_DESYNC_FACTOR,
196 .max_addresses = IPV6_MAX_ADDRESSES,
197 .accept_ra_defrtr = 1,
198 .accept_ra_pinfo = 1,
199 #ifdef CONFIG_IPV6_ROUTER_PREF
200 .accept_ra_rtr_pref = 1,
201 .rtr_probe_interval = 60 * HZ,
202 #ifdef CONFIG_IPV6_ROUTE_INFO
203 .accept_ra_rt_info_max_plen = 0,
207 .accept_source_route = 0, /* we do not accept RH0 by default. */
212 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
214 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
215 .mtu6 = IPV6_MIN_MTU,
217 .accept_redirects = 1,
220 .rtr_solicits = MAX_RTR_SOLICITATIONS,
221 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
222 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
223 #ifdef CONFIG_IPV6_PRIVACY
225 .temp_valid_lft = TEMP_VALID_LIFETIME,
226 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
227 .regen_max_retry = REGEN_MAX_RETRY,
228 .max_desync_factor = MAX_DESYNC_FACTOR,
230 .max_addresses = IPV6_MAX_ADDRESSES,
231 .accept_ra_defrtr = 1,
232 .accept_ra_pinfo = 1,
233 #ifdef CONFIG_IPV6_ROUTER_PREF
234 .accept_ra_rtr_pref = 1,
235 .rtr_probe_interval = 60 * HZ,
236 #ifdef CONFIG_IPV6_ROUTE_INFO
237 .accept_ra_rt_info_max_plen = 0,
241 .accept_source_route = 0, /* we do not accept RH0 by default. */
246 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
247 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
248 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
249 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
250 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
252 /* Check if a valid qdisc is available */
253 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
255 return !qdisc_tx_is_noop(dev);
258 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
260 if (del_timer(&ifp->timer))
264 enum addrconf_timer_t {
270 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
271 enum addrconf_timer_t what,
274 if (!del_timer(&ifp->timer))
279 ifp->timer.function = addrconf_dad_timer;
282 ifp->timer.function = addrconf_rs_timer;
287 ifp->timer.expires = jiffies + when;
288 add_timer(&ifp->timer);
291 static int snmp6_alloc_dev(struct inet6_dev *idev)
293 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
294 sizeof(struct ipstats_mib),
295 __alignof__(struct ipstats_mib)) < 0)
297 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
299 if (!idev->stats.icmpv6dev)
301 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
303 if (!idev->stats.icmpv6msgdev)
309 kfree(idev->stats.icmpv6dev);
311 snmp_mib_free((void __percpu **)idev->stats.ipv6);
316 static void snmp6_free_dev(struct inet6_dev *idev)
318 kfree(idev->stats.icmpv6msgdev);
319 kfree(idev->stats.icmpv6dev);
320 snmp_mib_free((void __percpu **)idev->stats.ipv6);
323 /* Nobody refers to this device, we may destroy it. */
325 void in6_dev_finish_destroy(struct inet6_dev *idev)
327 struct net_device *dev = idev->dev;
329 WARN_ON(!list_empty(&idev->addr_list));
330 WARN_ON(idev->mc_list != NULL);
332 #ifdef NET_REFCNT_DEBUG
333 pr_debug("%s: %s\n", __func__, dev ? dev->name : "NIL");
337 pr_warn("Freeing alive inet6 device %p\n", idev);
340 snmp6_free_dev(idev);
341 kfree_rcu(idev, rcu);
343 EXPORT_SYMBOL(in6_dev_finish_destroy);
345 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
347 struct inet6_dev *ndev;
351 if (dev->mtu < IPV6_MIN_MTU)
354 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
359 rwlock_init(&ndev->lock);
361 INIT_LIST_HEAD(&ndev->addr_list);
363 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
364 ndev->cnf.mtu6 = dev->mtu;
365 ndev->cnf.sysctl = NULL;
366 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
367 if (ndev->nd_parms == NULL) {
371 if (ndev->cnf.forwarding)
372 dev_disable_lro(dev);
373 /* We refer to the device */
376 if (snmp6_alloc_dev(ndev) < 0) {
378 "%s: cannot allocate memory for statistics; dev=%s.\n",
379 __func__, dev->name));
380 neigh_parms_release(&nd_tbl, ndev->nd_parms);
386 if (snmp6_register_dev(ndev) < 0) {
388 "%s: cannot create /proc/net/dev_snmp6/%s\n",
389 __func__, dev->name));
390 neigh_parms_release(&nd_tbl, ndev->nd_parms);
392 in6_dev_finish_destroy(ndev);
396 /* One reference from device. We must do this before
397 * we invoke __ipv6_regen_rndid().
401 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
402 ndev->cnf.accept_dad = -1;
404 #if IS_ENABLED(CONFIG_IPV6_SIT)
405 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
406 pr_info("%s: Disabled Multicast RS\n", dev->name);
407 ndev->cnf.rtr_solicits = 0;
411 #ifdef CONFIG_IPV6_PRIVACY
412 INIT_LIST_HEAD(&ndev->tempaddr_list);
413 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
414 if ((dev->flags&IFF_LOOPBACK) ||
415 dev->type == ARPHRD_TUNNEL ||
416 dev->type == ARPHRD_TUNNEL6 ||
417 dev->type == ARPHRD_SIT ||
418 dev->type == ARPHRD_NONE) {
419 ndev->cnf.use_tempaddr = -1;
422 ipv6_regen_rndid((unsigned long) ndev);
426 if (netif_running(dev) && addrconf_qdisc_ok(dev))
427 ndev->if_flags |= IF_READY;
429 ipv6_mc_init_dev(ndev);
430 ndev->tstamp = jiffies;
431 addrconf_sysctl_register(ndev);
432 /* protected by rtnl_lock */
433 rcu_assign_pointer(dev->ip6_ptr, ndev);
435 /* Join all-node multicast group */
436 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
438 /* Join all-router multicast group if forwarding is set */
439 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
440 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
445 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
447 struct inet6_dev *idev;
451 idev = __in6_dev_get(dev);
453 idev = ipv6_add_dev(dev);
458 if (dev->flags&IFF_UP)
463 static int inet6_netconf_msgsize_devconf(int type)
465 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
466 + nla_total_size(4); /* NETCONFA_IFINDEX */
468 /* type -1 is used for ALL */
469 if (type == -1 || type == NETCONFA_FORWARDING)
470 size += nla_total_size(4);
471 #ifdef CONFIG_IPV6_MROUTE
472 if (type == -1 || type == NETCONFA_MC_FORWARDING)
473 size += nla_total_size(4);
479 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
480 struct ipv6_devconf *devconf, u32 portid,
481 u32 seq, int event, unsigned int flags,
484 struct nlmsghdr *nlh;
485 struct netconfmsg *ncm;
487 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
492 ncm = nlmsg_data(nlh);
493 ncm->ncm_family = AF_INET6;
495 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
496 goto nla_put_failure;
498 /* type -1 is used for ALL */
499 if ((type == -1 || type == NETCONFA_FORWARDING) &&
500 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
501 goto nla_put_failure;
502 #ifdef CONFIG_IPV6_MROUTE
503 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
504 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
505 devconf->mc_forwarding) < 0)
506 goto nla_put_failure;
508 return nlmsg_end(skb, nlh);
511 nlmsg_cancel(skb, nlh);
515 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
516 struct ipv6_devconf *devconf)
521 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
525 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
526 RTM_NEWNETCONF, 0, type);
528 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
529 WARN_ON(err == -EMSGSIZE);
533 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
536 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
539 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
540 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
541 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
544 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
545 struct nlmsghdr *nlh,
548 struct net *net = sock_net(in_skb->sk);
549 struct nlattr *tb[NETCONFA_MAX+1];
550 struct netconfmsg *ncm;
552 struct ipv6_devconf *devconf;
553 struct inet6_dev *in6_dev;
554 struct net_device *dev;
558 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
559 devconf_ipv6_policy);
564 if (!tb[NETCONFA_IFINDEX])
567 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
569 case NETCONFA_IFINDEX_ALL:
570 devconf = net->ipv6.devconf_all;
572 case NETCONFA_IFINDEX_DEFAULT:
573 devconf = net->ipv6.devconf_dflt;
576 dev = __dev_get_by_index(net, ifindex);
579 in6_dev = __in6_dev_get(dev);
582 devconf = &in6_dev->cnf;
587 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
591 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
592 NETLINK_CB(in_skb).portid,
593 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
596 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
597 WARN_ON(err == -EMSGSIZE);
601 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
607 static void dev_forward_change(struct inet6_dev *idev)
609 struct net_device *dev;
610 struct inet6_ifaddr *ifa;
615 if (idev->cnf.forwarding)
616 dev_disable_lro(dev);
617 if (dev->flags & IFF_MULTICAST) {
618 if (idev->cnf.forwarding)
619 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
621 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
624 list_for_each_entry(ifa, &idev->addr_list, if_list) {
625 if (ifa->flags&IFA_F_TENTATIVE)
627 if (idev->cnf.forwarding)
628 addrconf_join_anycast(ifa);
630 addrconf_leave_anycast(ifa);
632 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
633 dev->ifindex, &idev->cnf);
637 static void addrconf_forward_change(struct net *net, __s32 newf)
639 struct net_device *dev;
640 struct inet6_dev *idev;
642 for_each_netdev(net, dev) {
643 idev = __in6_dev_get(dev);
645 int changed = (!idev->cnf.forwarding) ^ (!newf);
646 idev->cnf.forwarding = newf;
648 dev_forward_change(idev);
653 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
659 return restart_syscall();
661 net = (struct net *)table->extra2;
665 if (p == &net->ipv6.devconf_dflt->forwarding) {
666 if ((!newf) ^ (!old))
667 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
668 NETCONFA_IFINDEX_DEFAULT,
669 net->ipv6.devconf_dflt);
674 if (p == &net->ipv6.devconf_all->forwarding) {
675 net->ipv6.devconf_dflt->forwarding = newf;
676 addrconf_forward_change(net, newf);
677 if ((!newf) ^ (!old))
678 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
679 NETCONFA_IFINDEX_ALL,
680 net->ipv6.devconf_all);
681 } else if ((!newf) ^ (!old))
682 dev_forward_change((struct inet6_dev *)table->extra1);
686 rt6_purge_dflt_routers(net);
691 /* Nobody refers to this ifaddr, destroy it */
692 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
694 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
696 #ifdef NET_REFCNT_DEBUG
697 pr_debug("%s\n", __func__);
700 in6_dev_put(ifp->idev);
702 if (del_timer(&ifp->timer))
703 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
705 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
706 pr_warn("Freeing alive inet6 address %p\n", ifp);
715 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
718 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
721 * Each device address list is sorted in order of scope -
722 * global before linklocal.
724 list_for_each(p, &idev->addr_list) {
725 struct inet6_ifaddr *ifa
726 = list_entry(p, struct inet6_ifaddr, if_list);
727 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
731 list_add_tail(&ifp->if_list, p);
734 static u32 inet6_addr_hash(const struct in6_addr *addr)
736 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
739 /* On success it returns ifp with increased reference count */
741 static struct inet6_ifaddr *
742 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
743 int scope, u32 flags)
745 struct inet6_ifaddr *ifa = NULL;
749 int addr_type = ipv6_addr_type(addr);
751 if (addr_type == IPV6_ADDR_ANY ||
752 addr_type & IPV6_ADDR_MULTICAST ||
753 (!(idev->dev->flags & IFF_LOOPBACK) &&
754 addr_type & IPV6_ADDR_LOOPBACK))
755 return ERR_PTR(-EADDRNOTAVAIL);
759 err = -ENODEV; /*XXX*/
763 if (idev->cnf.disable_ipv6) {
768 spin_lock(&addrconf_hash_lock);
770 /* Ignore adding duplicate addresses on an interface */
771 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
772 ADBG(("ipv6_add_addr: already assigned\n"));
777 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
780 ADBG(("ipv6_add_addr: malloc failed\n"));
785 rt = addrconf_dst_alloc(idev, addr, false);
793 spin_lock_init(&ifa->lock);
794 spin_lock_init(&ifa->state_lock);
795 init_timer(&ifa->timer);
796 INIT_HLIST_NODE(&ifa->addr_lst);
797 ifa->timer.data = (unsigned long) ifa;
799 ifa->prefix_len = pfxlen;
800 ifa->flags = flags | IFA_F_TENTATIVE;
801 ifa->cstamp = ifa->tstamp = jiffies;
810 /* Add to big hash table */
811 hash = inet6_addr_hash(addr);
813 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
814 spin_unlock(&addrconf_hash_lock);
816 write_lock(&idev->lock);
817 /* Add to inet6_dev unicast addr list. */
818 ipv6_link_dev_addr(idev, ifa);
820 #ifdef CONFIG_IPV6_PRIVACY
821 if (ifa->flags&IFA_F_TEMPORARY) {
822 list_add(&ifa->tmp_list, &idev->tempaddr_list);
828 write_unlock(&idev->lock);
830 rcu_read_unlock_bh();
832 if (likely(err == 0))
833 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
841 spin_unlock(&addrconf_hash_lock);
845 /* This function wants to get referenced ifp and releases it before return */
847 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
849 struct inet6_ifaddr *ifa, *ifn;
850 struct inet6_dev *idev = ifp->idev;
852 int deleted = 0, onlink = 0;
853 unsigned long expires = jiffies;
855 spin_lock_bh(&ifp->state_lock);
857 ifp->state = INET6_IFADDR_STATE_DEAD;
858 spin_unlock_bh(&ifp->state_lock);
860 if (state == INET6_IFADDR_STATE_DEAD)
863 spin_lock_bh(&addrconf_hash_lock);
864 hlist_del_init_rcu(&ifp->addr_lst);
865 spin_unlock_bh(&addrconf_hash_lock);
867 write_lock_bh(&idev->lock);
868 #ifdef CONFIG_IPV6_PRIVACY
869 if (ifp->flags&IFA_F_TEMPORARY) {
870 list_del(&ifp->tmp_list);
872 in6_ifa_put(ifp->ifpub);
879 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
881 list_del_init(&ifp->if_list);
884 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
888 } else if (ifp->flags & IFA_F_PERMANENT) {
889 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
891 if (ifa->flags & IFA_F_PERMANENT) {
896 unsigned long lifetime;
901 spin_lock(&ifa->lock);
903 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
905 * Note: Because this address is
906 * not permanent, lifetime <
907 * LONG_MAX / HZ here.
909 if (time_before(expires,
910 ifa->tstamp + lifetime * HZ))
911 expires = ifa->tstamp + lifetime * HZ;
912 spin_unlock(&ifa->lock);
917 write_unlock_bh(&idev->lock);
919 addrconf_del_timer(ifp);
921 ipv6_ifa_notify(RTM_DELADDR, ifp);
923 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
926 * Purge or update corresponding prefix
928 * 1) we don't purge prefix here if address was not permanent.
929 * prefix is managed by its own lifetime.
930 * 2) if there're no addresses, delete prefix.
931 * 3) if there're still other permanent address(es),
932 * corresponding prefix is still permanent.
933 * 4) otherwise, update prefix lifetime to the
934 * longest valid lifetime among the corresponding
935 * addresses on the device.
936 * Note: subsequent RA will update lifetime.
940 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
941 struct in6_addr prefix;
944 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
946 rt = addrconf_get_prefix_route(&prefix,
949 0, RTF_GATEWAY | RTF_DEFAULT);
955 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
956 rt6_set_expires(rt, expires);
962 /* clean up prefsrc entries */
963 rt6_remove_prefsrc(ifp);
968 #ifdef CONFIG_IPV6_PRIVACY
969 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
971 struct inet6_dev *idev = ifp->idev;
972 struct in6_addr addr, *tmpaddr;
973 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
974 unsigned long regen_advance;
979 unsigned long now = jiffies;
981 write_lock(&idev->lock);
983 spin_lock_bh(&ift->lock);
984 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
985 spin_unlock_bh(&ift->lock);
992 if (idev->cnf.use_tempaddr <= 0) {
993 write_unlock(&idev->lock);
994 pr_info("%s: use_tempaddr is disabled\n", __func__);
999 spin_lock_bh(&ifp->lock);
1000 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1001 idev->cnf.use_tempaddr = -1; /*XXX*/
1002 spin_unlock_bh(&ifp->lock);
1003 write_unlock(&idev->lock);
1004 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1011 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1012 __ipv6_try_regen_rndid(idev, tmpaddr);
1013 memcpy(&addr.s6_addr[8], idev->rndid, 8);
1014 age = (now - ifp->tstamp) / HZ;
1015 tmp_valid_lft = min_t(__u32,
1017 idev->cnf.temp_valid_lft + age);
1018 tmp_prefered_lft = min_t(__u32,
1020 idev->cnf.temp_prefered_lft + age -
1021 idev->cnf.max_desync_factor);
1022 tmp_plen = ifp->prefix_len;
1023 max_addresses = idev->cnf.max_addresses;
1024 tmp_tstamp = ifp->tstamp;
1025 spin_unlock_bh(&ifp->lock);
1027 regen_advance = idev->cnf.regen_max_retry *
1028 idev->cnf.dad_transmits *
1029 idev->nd_parms->retrans_time / HZ;
1030 write_unlock(&idev->lock);
1032 /* A temporary address is created only if this calculated Preferred
1033 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1034 * an implementation must not create a temporary address with a zero
1035 * Preferred Lifetime.
1037 if (tmp_prefered_lft <= regen_advance) {
1044 addr_flags = IFA_F_TEMPORARY;
1045 /* set in addrconf_prefix_rcv() */
1046 if (ifp->flags & IFA_F_OPTIMISTIC)
1047 addr_flags |= IFA_F_OPTIMISTIC;
1049 ift = !max_addresses ||
1050 ipv6_count_addresses(idev) < max_addresses ?
1051 ipv6_add_addr(idev, &addr, tmp_plen,
1052 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
1054 if (!ift || IS_ERR(ift)) {
1057 pr_info("%s: retry temporary address regeneration\n", __func__);
1059 write_lock(&idev->lock);
1063 spin_lock_bh(&ift->lock);
1065 ift->valid_lft = tmp_valid_lft;
1066 ift->prefered_lft = tmp_prefered_lft;
1068 ift->tstamp = tmp_tstamp;
1069 spin_unlock_bh(&ift->lock);
1071 addrconf_dad_start(ift);
1080 * Choose an appropriate source address (RFC3484)
1083 IPV6_SADDR_RULE_INIT = 0,
1084 IPV6_SADDR_RULE_LOCAL,
1085 IPV6_SADDR_RULE_SCOPE,
1086 IPV6_SADDR_RULE_PREFERRED,
1087 #ifdef CONFIG_IPV6_MIP6
1088 IPV6_SADDR_RULE_HOA,
1090 IPV6_SADDR_RULE_OIF,
1091 IPV6_SADDR_RULE_LABEL,
1092 #ifdef CONFIG_IPV6_PRIVACY
1093 IPV6_SADDR_RULE_PRIVACY,
1095 IPV6_SADDR_RULE_ORCHID,
1096 IPV6_SADDR_RULE_PREFIX,
1100 struct ipv6_saddr_score {
1103 struct inet6_ifaddr *ifa;
1104 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1109 struct ipv6_saddr_dst {
1110 const struct in6_addr *addr;
1117 static inline int ipv6_saddr_preferred(int type)
1119 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1124 static int ipv6_get_saddr_eval(struct net *net,
1125 struct ipv6_saddr_score *score,
1126 struct ipv6_saddr_dst *dst,
1131 if (i <= score->rule) {
1133 case IPV6_SADDR_RULE_SCOPE:
1134 ret = score->scopedist;
1136 case IPV6_SADDR_RULE_PREFIX:
1137 ret = score->matchlen;
1140 ret = !!test_bit(i, score->scorebits);
1146 case IPV6_SADDR_RULE_INIT:
1147 /* Rule 0: remember if hiscore is not ready yet */
1150 case IPV6_SADDR_RULE_LOCAL:
1151 /* Rule 1: Prefer same address */
1152 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1154 case IPV6_SADDR_RULE_SCOPE:
1155 /* Rule 2: Prefer appropriate scope
1160 * ---+--+-+---> scope
1162 * | d is scope of the destination.
1164 * | \ <- smaller scope is better if
1165 * B-15 | \ if scope is enough for destinaion.
1166 * | ret = B - scope (-1 <= scope >= d <= 15).
1168 * |/ <- greater is better
1169 * -C / if scope is not enough for destination.
1170 * /| ret = scope - C (-1 <= d < scope <= 15).
1172 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1173 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1174 * Assume B = 0 and we get C > 29.
1176 ret = __ipv6_addr_src_scope(score->addr_type);
1177 if (ret >= dst->scope)
1180 ret -= 128; /* 30 is enough */
1181 score->scopedist = ret;
1183 case IPV6_SADDR_RULE_PREFERRED:
1184 /* Rule 3: Avoid deprecated and optimistic addresses */
1185 ret = ipv6_saddr_preferred(score->addr_type) ||
1186 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1188 #ifdef CONFIG_IPV6_MIP6
1189 case IPV6_SADDR_RULE_HOA:
1191 /* Rule 4: Prefer home address */
1192 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1193 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1197 case IPV6_SADDR_RULE_OIF:
1198 /* Rule 5: Prefer outgoing interface */
1199 ret = (!dst->ifindex ||
1200 dst->ifindex == score->ifa->idev->dev->ifindex);
1202 case IPV6_SADDR_RULE_LABEL:
1203 /* Rule 6: Prefer matching label */
1204 ret = ipv6_addr_label(net,
1205 &score->ifa->addr, score->addr_type,
1206 score->ifa->idev->dev->ifindex) == dst->label;
1208 #ifdef CONFIG_IPV6_PRIVACY
1209 case IPV6_SADDR_RULE_PRIVACY:
1211 /* Rule 7: Prefer public address
1212 * Note: prefer temporary address if use_tempaddr >= 2
1214 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1215 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1216 score->ifa->idev->cnf.use_tempaddr >= 2;
1217 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1221 case IPV6_SADDR_RULE_ORCHID:
1222 /* Rule 8-: Prefer ORCHID vs ORCHID or
1223 * non-ORCHID vs non-ORCHID
1225 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1226 ipv6_addr_orchid(dst->addr));
1228 case IPV6_SADDR_RULE_PREFIX:
1229 /* Rule 8: Use longest matching prefix */
1230 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1231 if (ret > score->ifa->prefix_len)
1232 ret = score->ifa->prefix_len;
1233 score->matchlen = ret;
1240 __set_bit(i, score->scorebits);
1246 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1247 const struct in6_addr *daddr, unsigned int prefs,
1248 struct in6_addr *saddr)
1250 struct ipv6_saddr_score scores[2],
1251 *score = &scores[0], *hiscore = &scores[1];
1252 struct ipv6_saddr_dst dst;
1253 struct net_device *dev;
1256 dst_type = __ipv6_addr_type(daddr);
1258 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1259 dst.scope = __ipv6_addr_src_scope(dst_type);
1260 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1264 hiscore->ifa = NULL;
1268 for_each_netdev_rcu(net, dev) {
1269 struct inet6_dev *idev;
1271 /* Candidate Source Address (section 4)
1272 * - multicast and link-local destination address,
1273 * the set of candidate source address MUST only
1274 * include addresses assigned to interfaces
1275 * belonging to the same link as the outgoing
1277 * (- For site-local destination addresses, the
1278 * set of candidate source addresses MUST only
1279 * include addresses assigned to interfaces
1280 * belonging to the same site as the outgoing
1283 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1284 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1285 dst.ifindex && dev->ifindex != dst.ifindex)
1288 idev = __in6_dev_get(dev);
1292 read_lock_bh(&idev->lock);
1293 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1297 * - Tentative Address (RFC2462 section 5.4)
1298 * - A tentative address is not considered
1299 * "assigned to an interface" in the traditional
1300 * sense, unless it is also flagged as optimistic.
1301 * - Candidate Source Address (section 4)
1302 * - In any case, anycast addresses, multicast
1303 * addresses, and the unspecified address MUST
1304 * NOT be included in a candidate set.
1306 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1307 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1310 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1312 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1313 score->addr_type & IPV6_ADDR_MULTICAST)) {
1314 LIMIT_NETDEBUG(KERN_DEBUG
1315 "ADDRCONF: unspecified / multicast address "
1316 "assigned as unicast address on %s",
1322 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1324 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1325 int minihiscore, miniscore;
1327 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1328 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1330 if (minihiscore > miniscore) {
1331 if (i == IPV6_SADDR_RULE_SCOPE &&
1332 score->scopedist > 0) {
1335 * each remaining entry
1336 * has too small (not enough)
1337 * scope, because ifa entries
1338 * are sorted by their scope
1344 } else if (minihiscore < miniscore) {
1346 in6_ifa_put(hiscore->ifa);
1348 in6_ifa_hold(score->ifa);
1350 swap(hiscore, score);
1352 /* restore our iterator */
1353 score->ifa = hiscore->ifa;
1360 read_unlock_bh(&idev->lock);
1365 return -EADDRNOTAVAIL;
1367 *saddr = hiscore->ifa->addr;
1368 in6_ifa_put(hiscore->ifa);
1371 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1373 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1374 unsigned char banned_flags)
1376 struct inet6_dev *idev;
1377 int err = -EADDRNOTAVAIL;
1380 idev = __in6_dev_get(dev);
1382 struct inet6_ifaddr *ifp;
1384 read_lock_bh(&idev->lock);
1385 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1386 if (ifp->scope == IFA_LINK &&
1387 !(ifp->flags & banned_flags)) {
1393 read_unlock_bh(&idev->lock);
1399 static int ipv6_count_addresses(struct inet6_dev *idev)
1402 struct inet6_ifaddr *ifp;
1404 read_lock_bh(&idev->lock);
1405 list_for_each_entry(ifp, &idev->addr_list, if_list)
1407 read_unlock_bh(&idev->lock);
1411 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1412 struct net_device *dev, int strict)
1414 struct inet6_ifaddr *ifp;
1415 struct hlist_node *node;
1416 unsigned int hash = inet6_addr_hash(addr);
1419 hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1420 if (!net_eq(dev_net(ifp->idev->dev), net))
1422 if (ipv6_addr_equal(&ifp->addr, addr) &&
1423 !(ifp->flags&IFA_F_TENTATIVE) &&
1424 (dev == NULL || ifp->idev->dev == dev ||
1425 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1426 rcu_read_unlock_bh();
1431 rcu_read_unlock_bh();
1434 EXPORT_SYMBOL(ipv6_chk_addr);
1436 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1437 struct net_device *dev)
1439 unsigned int hash = inet6_addr_hash(addr);
1440 struct inet6_ifaddr *ifp;
1441 struct hlist_node *node;
1443 hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1444 if (!net_eq(dev_net(ifp->idev->dev), net))
1446 if (ipv6_addr_equal(&ifp->addr, addr)) {
1447 if (dev == NULL || ifp->idev->dev == dev)
1454 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1456 struct inet6_dev *idev;
1457 struct inet6_ifaddr *ifa;
1462 idev = __in6_dev_get(dev);
1464 read_lock_bh(&idev->lock);
1465 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1466 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1471 read_unlock_bh(&idev->lock);
1476 EXPORT_SYMBOL(ipv6_chk_prefix);
1478 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1479 struct net_device *dev, int strict)
1481 struct inet6_ifaddr *ifp, *result = NULL;
1482 unsigned int hash = inet6_addr_hash(addr);
1483 struct hlist_node *node;
1486 hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1487 if (!net_eq(dev_net(ifp->idev->dev), net))
1489 if (ipv6_addr_equal(&ifp->addr, addr)) {
1490 if (dev == NULL || ifp->idev->dev == dev ||
1491 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1498 rcu_read_unlock_bh();
1503 /* Gets referenced address, destroys ifaddr */
1505 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1507 if (ifp->flags&IFA_F_PERMANENT) {
1508 spin_lock_bh(&ifp->lock);
1509 addrconf_del_timer(ifp);
1510 ifp->flags |= IFA_F_TENTATIVE;
1512 ifp->flags |= IFA_F_DADFAILED;
1513 spin_unlock_bh(&ifp->lock);
1515 ipv6_ifa_notify(0, ifp);
1517 #ifdef CONFIG_IPV6_PRIVACY
1518 } else if (ifp->flags&IFA_F_TEMPORARY) {
1519 struct inet6_ifaddr *ifpub;
1520 spin_lock_bh(&ifp->lock);
1523 in6_ifa_hold(ifpub);
1524 spin_unlock_bh(&ifp->lock);
1525 ipv6_create_tempaddr(ifpub, ifp);
1528 spin_unlock_bh(&ifp->lock);
1536 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1540 spin_lock(&ifp->state_lock);
1541 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1542 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1545 spin_unlock(&ifp->state_lock);
1550 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1552 struct inet6_dev *idev = ifp->idev;
1554 if (addrconf_dad_end(ifp)) {
1559 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1560 ifp->idev->dev->name, &ifp->addr);
1562 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1563 struct in6_addr addr;
1565 addr.s6_addr32[0] = htonl(0xfe800000);
1566 addr.s6_addr32[1] = 0;
1568 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1569 ipv6_addr_equal(&ifp->addr, &addr)) {
1570 /* DAD failed for link-local based on MAC address */
1571 idev->cnf.disable_ipv6 = 1;
1573 pr_info("%s: IPv6 being disabled!\n",
1574 ifp->idev->dev->name);
1578 addrconf_dad_stop(ifp, 1);
1581 /* Join to solicited addr multicast group. */
1583 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1585 struct in6_addr maddr;
1587 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1590 addrconf_addr_solict_mult(addr, &maddr);
1591 ipv6_dev_mc_inc(dev, &maddr);
1594 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1596 struct in6_addr maddr;
1598 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1601 addrconf_addr_solict_mult(addr, &maddr);
1602 __ipv6_dev_mc_dec(idev, &maddr);
1605 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1607 struct in6_addr addr;
1608 if (ifp->prefix_len == 127) /* RFC 6164 */
1610 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1611 if (ipv6_addr_any(&addr))
1613 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1616 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1618 struct in6_addr addr;
1619 if (ifp->prefix_len == 127) /* RFC 6164 */
1621 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1622 if (ipv6_addr_any(&addr))
1624 __ipv6_dev_ac_dec(ifp->idev, &addr);
1627 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1629 if (dev->addr_len != ETH_ALEN)
1631 memcpy(eui, dev->dev_addr, 3);
1632 memcpy(eui + 5, dev->dev_addr + 3, 3);
1635 * The zSeries OSA network cards can be shared among various
1636 * OS instances, but the OSA cards have only one MAC address.
1637 * This leads to duplicate address conflicts in conjunction
1638 * with IPv6 if more than one instance uses the same card.
1640 * The driver for these cards can deliver a unique 16-bit
1641 * identifier for each instance sharing the same card. It is
1642 * placed instead of 0xFFFE in the interface identifier. The
1643 * "u" bit of the interface identifier is not inverted in this
1644 * case. Hence the resulting interface identifier has local
1645 * scope according to RFC2373.
1648 eui[3] = (dev->dev_id >> 8) & 0xFF;
1649 eui[4] = dev->dev_id & 0xFF;
1658 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1660 if (dev->addr_len != IEEE802154_ADDR_LEN)
1662 memcpy(eui, dev->dev_addr, 8);
1666 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1668 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1669 if (dev->addr_len != ARCNET_ALEN)
1672 eui[7] = *(u8 *)dev->dev_addr;
1676 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1678 if (dev->addr_len != INFINIBAND_ALEN)
1680 memcpy(eui, dev->dev_addr + 12, 8);
1685 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1689 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1690 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1691 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1692 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1693 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1694 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1698 memcpy(eui + 4, &addr, 4);
1702 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1704 if (dev->priv_flags & IFF_ISATAP)
1705 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1709 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1711 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1714 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1716 switch (dev->type) {
1719 return addrconf_ifid_eui48(eui, dev);
1721 return addrconf_ifid_arcnet(eui, dev);
1722 case ARPHRD_INFINIBAND:
1723 return addrconf_ifid_infiniband(eui, dev);
1725 return addrconf_ifid_sit(eui, dev);
1727 return addrconf_ifid_gre(eui, dev);
1728 case ARPHRD_IEEE802154:
1729 return addrconf_ifid_eui64(eui, dev);
1734 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1737 struct inet6_ifaddr *ifp;
1739 read_lock_bh(&idev->lock);
1740 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1741 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1742 memcpy(eui, ifp->addr.s6_addr+8, 8);
1747 read_unlock_bh(&idev->lock);
1751 #ifdef CONFIG_IPV6_PRIVACY
1752 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1753 static void __ipv6_regen_rndid(struct inet6_dev *idev)
1756 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1757 idev->rndid[0] &= ~0x02;
1760 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1761 * check if generated address is not inappropriate
1763 * - Reserved subnet anycast (RFC 2526)
1764 * 11111101 11....11 1xxxxxxx
1765 * - ISATAP (RFC4214) 6.1
1766 * 00-00-5E-FE-xx-xx-xx-xx
1768 * - XXX: already assigned to an address on the device
1770 if (idev->rndid[0] == 0xfd &&
1771 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1772 (idev->rndid[7]&0x80))
1774 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1775 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1777 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1782 static void ipv6_regen_rndid(unsigned long data)
1784 struct inet6_dev *idev = (struct inet6_dev *) data;
1785 unsigned long expires;
1788 write_lock_bh(&idev->lock);
1793 __ipv6_regen_rndid(idev);
1796 idev->cnf.temp_prefered_lft * HZ -
1797 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1798 idev->cnf.max_desync_factor * HZ;
1799 if (time_before(expires, jiffies)) {
1800 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
1801 __func__, idev->dev->name);
1805 if (!mod_timer(&idev->regen_timer, expires))
1809 write_unlock_bh(&idev->lock);
1810 rcu_read_unlock_bh();
1814 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
1816 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1817 __ipv6_regen_rndid(idev);
1826 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1827 unsigned long expires, u32 flags)
1829 struct fib6_config cfg = {
1830 .fc_table = RT6_TABLE_PREFIX,
1831 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1832 .fc_ifindex = dev->ifindex,
1833 .fc_expires = expires,
1835 .fc_flags = RTF_UP | flags,
1836 .fc_nlinfo.nl_net = dev_net(dev),
1837 .fc_protocol = RTPROT_KERNEL,
1842 /* Prevent useless cloning on PtP SIT.
1843 This thing is done here expecting that the whole
1844 class of non-broadcast devices need not cloning.
1846 #if IS_ENABLED(CONFIG_IPV6_SIT)
1847 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1848 cfg.fc_flags |= RTF_NONEXTHOP;
1851 ip6_route_add(&cfg);
1855 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
1857 const struct net_device *dev,
1858 u32 flags, u32 noflags)
1860 struct fib6_node *fn;
1861 struct rt6_info *rt = NULL;
1862 struct fib6_table *table;
1864 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
1868 read_lock_bh(&table->tb6_lock);
1869 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
1872 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1873 if (rt->dst.dev->ifindex != dev->ifindex)
1875 if ((rt->rt6i_flags & flags) != flags)
1877 if ((rt->rt6i_flags & noflags) != 0)
1883 read_unlock_bh(&table->tb6_lock);
1888 /* Create "default" multicast route to the interface */
1890 static void addrconf_add_mroute(struct net_device *dev)
1892 struct fib6_config cfg = {
1893 .fc_table = RT6_TABLE_LOCAL,
1894 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1895 .fc_ifindex = dev->ifindex,
1898 .fc_nlinfo.nl_net = dev_net(dev),
1901 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1903 ip6_route_add(&cfg);
1906 #if IS_ENABLED(CONFIG_IPV6_SIT)
1907 static void sit_route_add(struct net_device *dev)
1909 struct fib6_config cfg = {
1910 .fc_table = RT6_TABLE_MAIN,
1911 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1912 .fc_ifindex = dev->ifindex,
1914 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1915 .fc_nlinfo.nl_net = dev_net(dev),
1918 /* prefix length - 96 bits "::d.d.d.d" */
1919 ip6_route_add(&cfg);
1923 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1925 struct inet6_dev *idev;
1929 idev = ipv6_find_idev(dev);
1931 return ERR_PTR(-ENOBUFS);
1933 if (idev->cnf.disable_ipv6)
1934 return ERR_PTR(-EACCES);
1936 /* Add default multicast route */
1937 if (!(dev->flags & IFF_LOOPBACK))
1938 addrconf_add_mroute(dev);
1943 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1945 struct prefix_info *pinfo;
1949 struct inet6_dev *in6_dev;
1950 struct net *net = dev_net(dev);
1952 pinfo = (struct prefix_info *) opt;
1954 if (len < sizeof(struct prefix_info)) {
1955 ADBG(("addrconf: prefix option too short\n"));
1960 * Validation checks ([ADDRCONF], page 19)
1963 addr_type = ipv6_addr_type(&pinfo->prefix);
1965 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1968 valid_lft = ntohl(pinfo->valid);
1969 prefered_lft = ntohl(pinfo->prefered);
1971 if (prefered_lft > valid_lft) {
1972 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1976 in6_dev = in6_dev_get(dev);
1978 if (in6_dev == NULL) {
1979 net_dbg_ratelimited("addrconf: device %s not configured\n",
1985 * Two things going on here:
1986 * 1) Add routes for on-link prefixes
1987 * 2) Configure prefixes with the auto flag set
1990 if (pinfo->onlink) {
1991 struct rt6_info *rt;
1992 unsigned long rt_expires;
1994 /* Avoid arithmetic overflow. Really, we could
1995 * save rt_expires in seconds, likely valid_lft,
1996 * but it would require division in fib gc, that it
2000 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2002 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2004 if (addrconf_finite_timeout(rt_expires))
2007 rt = addrconf_get_prefix_route(&pinfo->prefix,
2010 RTF_ADDRCONF | RTF_PREFIX_RT,
2011 RTF_GATEWAY | RTF_DEFAULT);
2014 /* Autoconf prefix route */
2015 if (valid_lft == 0) {
2018 } else if (addrconf_finite_timeout(rt_expires)) {
2020 rt6_set_expires(rt, jiffies + rt_expires);
2022 rt6_clean_expires(rt);
2024 } else if (valid_lft) {
2025 clock_t expires = 0;
2026 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2027 if (addrconf_finite_timeout(rt_expires)) {
2029 flags |= RTF_EXPIRES;
2030 expires = jiffies_to_clock_t(rt_expires);
2032 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2033 dev, expires, flags);
2038 /* Try to figure out our local address for this prefix */
2040 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2041 struct inet6_ifaddr *ifp;
2042 struct in6_addr addr;
2043 int create = 0, update_lft = 0;
2045 if (pinfo->prefix_len == 64) {
2046 memcpy(&addr, &pinfo->prefix, 8);
2047 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2048 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2049 in6_dev_put(in6_dev);
2054 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2056 in6_dev_put(in6_dev);
2061 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
2063 if (ifp == NULL && valid_lft) {
2064 int max_addresses = in6_dev->cnf.max_addresses;
2067 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2068 if (in6_dev->cnf.optimistic_dad &&
2069 !net->ipv6.devconf_all->forwarding && sllao)
2070 addr_flags = IFA_F_OPTIMISTIC;
2073 /* Do not allow to create too much of autoconfigured
2074 * addresses; this would be too easy way to crash kernel.
2076 if (!max_addresses ||
2077 ipv6_count_addresses(in6_dev) < max_addresses)
2078 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
2079 addr_type&IPV6_ADDR_SCOPE_MASK,
2082 if (!ifp || IS_ERR(ifp)) {
2083 in6_dev_put(in6_dev);
2087 update_lft = create = 1;
2088 ifp->cstamp = jiffies;
2089 addrconf_dad_start(ifp);
2095 #ifdef CONFIG_IPV6_PRIVACY
2096 struct inet6_ifaddr *ift;
2100 /* update lifetime (RFC2462 5.5.3 e) */
2101 spin_lock(&ifp->lock);
2103 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2104 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2107 if (!update_lft && stored_lft) {
2108 if (valid_lft > MIN_VALID_LIFETIME ||
2109 valid_lft > stored_lft)
2111 else if (stored_lft <= MIN_VALID_LIFETIME) {
2112 /* valid_lft <= stored_lft is always true */
2114 * RFC 4862 Section 5.5.3e:
2115 * "Note that the preferred lifetime of
2116 * the corresponding address is always
2117 * reset to the Preferred Lifetime in
2118 * the received Prefix Information
2119 * option, regardless of whether the
2120 * valid lifetime is also reset or
2123 * So if the preferred lifetime in
2124 * this advertisement is different
2125 * than what we have stored, but the
2126 * valid lifetime is invalid, just
2127 * reset prefered_lft.
2129 * We must set the valid lifetime
2130 * to the stored lifetime since we'll
2131 * be updating the timestamp below,
2132 * else we'll set it back to the
2135 if (prefered_lft != ifp->prefered_lft) {
2136 valid_lft = stored_lft;
2140 valid_lft = MIN_VALID_LIFETIME;
2141 if (valid_lft < prefered_lft)
2142 prefered_lft = valid_lft;
2148 ifp->valid_lft = valid_lft;
2149 ifp->prefered_lft = prefered_lft;
2152 ifp->flags &= ~IFA_F_DEPRECATED;
2153 spin_unlock(&ifp->lock);
2155 if (!(flags&IFA_F_TENTATIVE))
2156 ipv6_ifa_notify(0, ifp);
2158 spin_unlock(&ifp->lock);
2160 #ifdef CONFIG_IPV6_PRIVACY
2161 read_lock_bh(&in6_dev->lock);
2162 /* update all temporary addresses in the list */
2163 list_for_each_entry(ift, &in6_dev->tempaddr_list,
2165 int age, max_valid, max_prefered;
2167 if (ifp != ift->ifpub)
2171 * RFC 4941 section 3.3:
2172 * If a received option will extend the lifetime
2173 * of a public address, the lifetimes of
2174 * temporary addresses should be extended,
2175 * subject to the overall constraint that no
2176 * temporary addresses should ever remain
2177 * "valid" or "preferred" for a time longer than
2178 * (TEMP_VALID_LIFETIME) or
2179 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR),
2182 age = (now - ift->cstamp) / HZ;
2183 max_valid = in6_dev->cnf.temp_valid_lft - age;
2187 max_prefered = in6_dev->cnf.temp_prefered_lft -
2188 in6_dev->cnf.max_desync_factor -
2190 if (max_prefered < 0)
2193 if (valid_lft > max_valid)
2194 valid_lft = max_valid;
2196 if (prefered_lft > max_prefered)
2197 prefered_lft = max_prefered;
2199 spin_lock(&ift->lock);
2201 ift->valid_lft = valid_lft;
2202 ift->prefered_lft = prefered_lft;
2204 if (prefered_lft > 0)
2205 ift->flags &= ~IFA_F_DEPRECATED;
2207 spin_unlock(&ift->lock);
2208 if (!(flags&IFA_F_TENTATIVE))
2209 ipv6_ifa_notify(0, ift);
2212 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
2214 * When a new public address is created as
2215 * described in [ADDRCONF], also create a new
2216 * temporary address. Also create a temporary
2217 * address if it's enabled but no temporary
2218 * address currently exists.
2220 read_unlock_bh(&in6_dev->lock);
2221 ipv6_create_tempaddr(ifp, NULL);
2223 read_unlock_bh(&in6_dev->lock);
2230 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2231 in6_dev_put(in6_dev);
2235 * Set destination address.
2236 * Special case for SIT interfaces where we create a new "virtual"
2239 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2241 struct in6_ifreq ireq;
2242 struct net_device *dev;
2248 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2251 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2257 #if IS_ENABLED(CONFIG_IPV6_SIT)
2258 if (dev->type == ARPHRD_SIT) {
2259 const struct net_device_ops *ops = dev->netdev_ops;
2261 struct ip_tunnel_parm p;
2263 err = -EADDRNOTAVAIL;
2264 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2267 memset(&p, 0, sizeof(p));
2268 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2272 p.iph.protocol = IPPROTO_IPV6;
2274 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2276 if (ops->ndo_do_ioctl) {
2277 mm_segment_t oldfs = get_fs();
2280 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2287 dev = __dev_get_by_name(net, p.name);
2290 err = dev_open(dev);
2301 * Manual configuration of address on an interface
2303 static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx,
2304 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2307 struct inet6_ifaddr *ifp;
2308 struct inet6_dev *idev;
2309 struct net_device *dev;
2313 unsigned long timeout;
2320 /* check the lifetime */
2321 if (!valid_lft || prefered_lft > valid_lft)
2324 dev = __dev_get_by_index(net, ifindex);
2328 idev = addrconf_add_dev(dev);
2330 return PTR_ERR(idev);
2332 scope = ipv6_addr_scope(pfx);
2334 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2335 if (addrconf_finite_timeout(timeout)) {
2336 expires = jiffies_to_clock_t(timeout * HZ);
2337 valid_lft = timeout;
2338 flags = RTF_EXPIRES;
2342 ifa_flags |= IFA_F_PERMANENT;
2345 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2346 if (addrconf_finite_timeout(timeout)) {
2348 ifa_flags |= IFA_F_DEPRECATED;
2349 prefered_lft = timeout;
2352 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2355 spin_lock_bh(&ifp->lock);
2356 ifp->valid_lft = valid_lft;
2357 ifp->prefered_lft = prefered_lft;
2358 ifp->tstamp = jiffies;
2359 spin_unlock_bh(&ifp->lock);
2361 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2364 * Note that section 3.1 of RFC 4429 indicates
2365 * that the Optimistic flag should not be set for
2366 * manually configured addresses
2368 addrconf_dad_start(ifp);
2374 return PTR_ERR(ifp);
2377 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
2380 struct inet6_ifaddr *ifp;
2381 struct inet6_dev *idev;
2382 struct net_device *dev;
2387 dev = __dev_get_by_index(net, ifindex);
2391 if ((idev = __in6_dev_get(dev)) == NULL)
2394 read_lock_bh(&idev->lock);
2395 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2396 if (ifp->prefix_len == plen &&
2397 ipv6_addr_equal(pfx, &ifp->addr)) {
2399 read_unlock_bh(&idev->lock);
2403 /* If the last address is deleted administratively,
2404 disable IPv6 on this interface.
2406 if (list_empty(&idev->addr_list))
2407 addrconf_ifdown(idev->dev, 1);
2411 read_unlock_bh(&idev->lock);
2412 return -EADDRNOTAVAIL;
2416 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2418 struct in6_ifreq ireq;
2421 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2424 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2428 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2429 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2430 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2435 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2437 struct in6_ifreq ireq;
2440 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2443 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2447 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2448 ireq.ifr6_prefixlen);
2453 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2454 int plen, int scope)
2456 struct inet6_ifaddr *ifp;
2458 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2460 spin_lock_bh(&ifp->lock);
2461 ifp->flags &= ~IFA_F_TENTATIVE;
2462 spin_unlock_bh(&ifp->lock);
2463 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2468 #if IS_ENABLED(CONFIG_IPV6_SIT)
2469 static void sit_add_v4_addrs(struct inet6_dev *idev)
2471 struct in6_addr addr;
2472 struct net_device *dev;
2473 struct net *net = dev_net(idev->dev);
2478 memset(&addr, 0, sizeof(struct in6_addr));
2479 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2481 if (idev->dev->flags&IFF_POINTOPOINT) {
2482 addr.s6_addr32[0] = htonl(0xfe800000);
2485 scope = IPV6_ADDR_COMPATv4;
2488 if (addr.s6_addr32[3]) {
2489 add_addr(idev, &addr, 128, scope);
2493 for_each_netdev(net, dev) {
2494 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2495 if (in_dev && (dev->flags & IFF_UP)) {
2496 struct in_ifaddr *ifa;
2500 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2503 addr.s6_addr32[3] = ifa->ifa_local;
2505 if (ifa->ifa_scope == RT_SCOPE_LINK)
2507 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2508 if (idev->dev->flags&IFF_POINTOPOINT)
2512 if (idev->dev->flags&IFF_POINTOPOINT)
2517 add_addr(idev, &addr, plen, flag);
2524 static void init_loopback(struct net_device *dev)
2526 struct inet6_dev *idev;
2532 if ((idev = ipv6_find_idev(dev)) == NULL) {
2533 pr_debug("%s: add_dev failed\n", __func__);
2537 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2540 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
2542 struct inet6_ifaddr *ifp;
2543 u32 addr_flags = IFA_F_PERMANENT;
2545 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2546 if (idev->cnf.optimistic_dad &&
2547 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2548 addr_flags |= IFA_F_OPTIMISTIC;
2552 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2554 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2555 addrconf_dad_start(ifp);
2560 static void addrconf_dev_config(struct net_device *dev)
2562 struct in6_addr addr;
2563 struct inet6_dev *idev;
2567 if ((dev->type != ARPHRD_ETHER) &&
2568 (dev->type != ARPHRD_FDDI) &&
2569 (dev->type != ARPHRD_ARCNET) &&
2570 (dev->type != ARPHRD_INFINIBAND) &&
2571 (dev->type != ARPHRD_IEEE802154)) {
2572 /* Alas, we support only Ethernet autoconfiguration. */
2576 idev = addrconf_add_dev(dev);
2580 memset(&addr, 0, sizeof(struct in6_addr));
2581 addr.s6_addr32[0] = htonl(0xFE800000);
2583 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2584 addrconf_add_linklocal(idev, &addr);
2587 #if IS_ENABLED(CONFIG_IPV6_SIT)
2588 static void addrconf_sit_config(struct net_device *dev)
2590 struct inet6_dev *idev;
2595 * Configure the tunnel with one of our IPv4
2596 * addresses... we should configure all of
2597 * our v4 addrs in the tunnel
2600 if ((idev = ipv6_find_idev(dev)) == NULL) {
2601 pr_debug("%s: add_dev failed\n", __func__);
2605 if (dev->priv_flags & IFF_ISATAP) {
2606 struct in6_addr addr;
2608 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2609 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2610 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2611 addrconf_add_linklocal(idev, &addr);
2615 sit_add_v4_addrs(idev);
2617 if (dev->flags&IFF_POINTOPOINT)
2618 addrconf_add_mroute(dev);
2624 #if IS_ENABLED(CONFIG_NET_IPGRE)
2625 static void addrconf_gre_config(struct net_device *dev)
2627 struct inet6_dev *idev;
2628 struct in6_addr addr;
2630 pr_info("%s(%s)\n", __func__, dev->name);
2634 if ((idev = ipv6_find_idev(dev)) == NULL) {
2635 pr_debug("%s: add_dev failed\n", __func__);
2639 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2640 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2642 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2643 addrconf_add_linklocal(idev, &addr);
2648 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2650 struct in6_addr lladdr;
2652 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2653 addrconf_add_linklocal(idev, &lladdr);
2659 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2661 struct net_device *link_dev;
2662 struct net *net = dev_net(idev->dev);
2664 /* first try to inherit the link-local address from the link device */
2665 if (idev->dev->iflink &&
2666 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2667 if (!ipv6_inherit_linklocal(idev, link_dev))
2670 /* then try to inherit it from any device */
2671 for_each_netdev(net, link_dev) {
2672 if (!ipv6_inherit_linklocal(idev, link_dev))
2675 pr_debug("init ip6-ip6: add_linklocal failed\n");
2679 * Autoconfigure tunnel with a link-local address so routing protocols,
2680 * DHCPv6, MLD etc. can be run over the virtual link
2683 static void addrconf_ip6_tnl_config(struct net_device *dev)
2685 struct inet6_dev *idev;
2689 idev = addrconf_add_dev(dev);
2691 pr_debug("init ip6-ip6: add_dev failed\n");
2694 ip6_tnl_add_linklocal(idev);
2697 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2700 struct net_device *dev = (struct net_device *) data;
2701 struct inet6_dev *idev = __in6_dev_get(dev);
2702 int run_pending = 0;
2706 case NETDEV_REGISTER:
2707 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2708 idev = ipv6_add_dev(dev);
2710 return notifier_from_errno(-ENOMEM);
2716 if (dev->flags & IFF_SLAVE)
2719 if (event == NETDEV_UP) {
2720 if (!addrconf_qdisc_ok(dev)) {
2721 /* device is not ready yet. */
2722 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
2727 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2728 idev = ipv6_add_dev(dev);
2731 idev->if_flags |= IF_READY;
2735 if (!addrconf_qdisc_ok(dev)) {
2736 /* device is still not ready. */
2741 if (idev->if_flags & IF_READY)
2742 /* device is already configured. */
2744 idev->if_flags |= IF_READY;
2747 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
2753 switch (dev->type) {
2754 #if IS_ENABLED(CONFIG_IPV6_SIT)
2756 addrconf_sit_config(dev);
2759 #if IS_ENABLED(CONFIG_NET_IPGRE)
2761 addrconf_gre_config(dev);
2764 case ARPHRD_TUNNEL6:
2765 addrconf_ip6_tnl_config(dev);
2767 case ARPHRD_LOOPBACK:
2772 addrconf_dev_config(dev);
2778 addrconf_dad_run(idev);
2781 * If the MTU changed during the interface down,
2782 * when the interface up, the changed MTU must be
2783 * reflected in the idev as well as routers.
2785 if (idev->cnf.mtu6 != dev->mtu &&
2786 dev->mtu >= IPV6_MIN_MTU) {
2787 rt6_mtu_change(dev, dev->mtu);
2788 idev->cnf.mtu6 = dev->mtu;
2790 idev->tstamp = jiffies;
2791 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2794 * If the changed mtu during down is lower than
2795 * IPV6_MIN_MTU stop IPv6 on this interface.
2797 if (dev->mtu < IPV6_MIN_MTU)
2798 addrconf_ifdown(dev, 1);
2802 case NETDEV_CHANGEMTU:
2803 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2804 rt6_mtu_change(dev, dev->mtu);
2805 idev->cnf.mtu6 = dev->mtu;
2809 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2810 idev = ipv6_add_dev(dev);
2816 * MTU falled under IPV6_MIN_MTU.
2817 * Stop IPv6 on this interface.
2821 case NETDEV_UNREGISTER:
2823 * Remove all addresses from this interface.
2825 addrconf_ifdown(dev, event != NETDEV_DOWN);
2828 case NETDEV_CHANGENAME:
2830 snmp6_unregister_dev(idev);
2831 addrconf_sysctl_unregister(idev);
2832 addrconf_sysctl_register(idev);
2833 err = snmp6_register_dev(idev);
2835 return notifier_from_errno(err);
2839 case NETDEV_PRE_TYPE_CHANGE:
2840 case NETDEV_POST_TYPE_CHANGE:
2841 addrconf_type_change(dev, event);
2849 * addrconf module should be notified of a device going up
2851 static struct notifier_block ipv6_dev_notf = {
2852 .notifier_call = addrconf_notify,
2855 static void addrconf_type_change(struct net_device *dev, unsigned long event)
2857 struct inet6_dev *idev;
2860 idev = __in6_dev_get(dev);
2862 if (event == NETDEV_POST_TYPE_CHANGE)
2863 ipv6_mc_remap(idev);
2864 else if (event == NETDEV_PRE_TYPE_CHANGE)
2865 ipv6_mc_unmap(idev);
2868 static int addrconf_ifdown(struct net_device *dev, int how)
2870 struct net *net = dev_net(dev);
2871 struct inet6_dev *idev;
2872 struct inet6_ifaddr *ifa;
2877 rt6_ifdown(net, dev);
2878 neigh_ifdown(&nd_tbl, dev);
2880 idev = __in6_dev_get(dev);
2885 * Step 1: remove reference to ipv6 device from parent device.
2891 /* protected by rtnl_lock */
2892 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
2894 /* Step 1.5: remove snmp6 entry */
2895 snmp6_unregister_dev(idev);
2899 /* Step 2: clear hash table */
2900 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
2901 struct hlist_head *h = &inet6_addr_lst[i];
2902 struct hlist_node *n;
2904 spin_lock_bh(&addrconf_hash_lock);
2906 hlist_for_each_entry_rcu(ifa, n, h, addr_lst) {
2907 if (ifa->idev == idev) {
2908 hlist_del_init_rcu(&ifa->addr_lst);
2909 addrconf_del_timer(ifa);
2913 spin_unlock_bh(&addrconf_hash_lock);
2916 write_lock_bh(&idev->lock);
2918 /* Step 2: clear flags for stateless addrconf */
2920 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2922 #ifdef CONFIG_IPV6_PRIVACY
2923 if (how && del_timer(&idev->regen_timer))
2926 /* Step 3: clear tempaddr list */
2927 while (!list_empty(&idev->tempaddr_list)) {
2928 ifa = list_first_entry(&idev->tempaddr_list,
2929 struct inet6_ifaddr, tmp_list);
2930 list_del(&ifa->tmp_list);
2931 write_unlock_bh(&idev->lock);
2932 spin_lock_bh(&ifa->lock);
2935 in6_ifa_put(ifa->ifpub);
2938 spin_unlock_bh(&ifa->lock);
2940 write_lock_bh(&idev->lock);
2944 while (!list_empty(&idev->addr_list)) {
2945 ifa = list_first_entry(&idev->addr_list,
2946 struct inet6_ifaddr, if_list);
2947 addrconf_del_timer(ifa);
2949 list_del(&ifa->if_list);
2951 write_unlock_bh(&idev->lock);
2953 spin_lock_bh(&ifa->state_lock);
2955 ifa->state = INET6_IFADDR_STATE_DEAD;
2956 spin_unlock_bh(&ifa->state_lock);
2958 if (state != INET6_IFADDR_STATE_DEAD) {
2959 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2960 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2964 write_lock_bh(&idev->lock);
2967 write_unlock_bh(&idev->lock);
2969 /* Step 5: Discard multicast list */
2971 ipv6_mc_destroy_dev(idev);
2975 idev->tstamp = jiffies;
2977 /* Last: Shot the device (if unregistered) */
2979 addrconf_sysctl_unregister(idev);
2980 neigh_parms_release(&nd_tbl, idev->nd_parms);
2981 neigh_ifdown(&nd_tbl, dev);
2987 static void addrconf_rs_timer(unsigned long data)
2989 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2990 struct inet6_dev *idev = ifp->idev;
2992 read_lock(&idev->lock);
2993 if (idev->dead || !(idev->if_flags & IF_READY))
2996 if (!ipv6_accept_ra(idev))
2999 /* Announcement received after solicitation was sent */
3000 if (idev->if_flags & IF_RA_RCVD)
3003 spin_lock(&ifp->lock);
3004 if (ifp->probes++ < idev->cnf.rtr_solicits) {
3005 /* The wait after the last probe can be shorter */
3006 addrconf_mod_timer(ifp, AC_RS,
3007 (ifp->probes == idev->cnf.rtr_solicits) ?
3008 idev->cnf.rtr_solicit_delay :
3009 idev->cnf.rtr_solicit_interval);
3010 spin_unlock(&ifp->lock);
3012 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
3014 spin_unlock(&ifp->lock);
3016 * Note: we do not support deprecated "all on-link"
3017 * assumption any longer.
3019 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3023 read_unlock(&idev->lock);
3028 * Duplicate Address Detection
3030 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3032 unsigned long rand_num;
3033 struct inet6_dev *idev = ifp->idev;
3035 if (ifp->flags & IFA_F_OPTIMISTIC)
3038 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
3040 ifp->probes = idev->cnf.dad_transmits;
3041 addrconf_mod_timer(ifp, AC_DAD, rand_num);
3044 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3046 struct inet6_dev *idev = ifp->idev;
3047 struct net_device *dev = idev->dev;
3049 addrconf_join_solict(dev, &ifp->addr);
3051 net_srandom(ifp->addr.s6_addr32[3]);
3053 read_lock_bh(&idev->lock);
3054 spin_lock(&ifp->lock);
3055 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3058 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3059 idev->cnf.accept_dad < 1 ||
3060 !(ifp->flags&IFA_F_TENTATIVE) ||
3061 ifp->flags & IFA_F_NODAD) {
3062 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3063 spin_unlock(&ifp->lock);
3064 read_unlock_bh(&idev->lock);
3066 addrconf_dad_completed(ifp);
3070 if (!(idev->if_flags & IF_READY)) {
3071 spin_unlock(&ifp->lock);
3072 read_unlock_bh(&idev->lock);
3074 * If the device is not ready:
3075 * - keep it tentative if it is a permanent address.
3076 * - otherwise, kill it.
3079 addrconf_dad_stop(ifp, 0);
3084 * Optimistic nodes can start receiving
3087 if (ifp->flags & IFA_F_OPTIMISTIC)
3088 ip6_ins_rt(ifp->rt);
3090 addrconf_dad_kick(ifp);
3092 spin_unlock(&ifp->lock);
3093 read_unlock_bh(&idev->lock);
3096 static void addrconf_dad_timer(unsigned long data)
3098 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
3099 struct inet6_dev *idev = ifp->idev;
3100 struct in6_addr mcaddr;
3102 if (!ifp->probes && addrconf_dad_end(ifp))
3105 read_lock(&idev->lock);
3106 if (idev->dead || !(idev->if_flags & IF_READY)) {
3107 read_unlock(&idev->lock);
3111 spin_lock(&ifp->lock);
3112 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3113 spin_unlock(&ifp->lock);
3114 read_unlock(&idev->lock);
3118 if (ifp->probes == 0) {
3120 * DAD was successful
3123 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3124 spin_unlock(&ifp->lock);
3125 read_unlock(&idev->lock);
3127 addrconf_dad_completed(ifp);
3133 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
3134 spin_unlock(&ifp->lock);
3135 read_unlock(&idev->lock);
3137 /* send a neighbour solicitation for our addr */
3138 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3139 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
3144 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3146 struct net_device *dev = ifp->idev->dev;
3149 * Configure the address for reception. Now it is valid.
3152 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3154 /* If added prefix is link local and we are prepared to process
3155 router advertisements, start sending router solicitations.
3158 if (ipv6_accept_ra(ifp->idev) &&
3159 ifp->idev->cnf.rtr_solicits > 0 &&
3160 (dev->flags&IFF_LOOPBACK) == 0 &&
3161 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
3163 * If a host as already performed a random delay
3164 * [...] as part of DAD [...] there is no need
3165 * to delay again before sending the first RS
3167 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
3169 spin_lock_bh(&ifp->lock);
3171 ifp->idev->if_flags |= IF_RS_SENT;
3172 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
3173 spin_unlock_bh(&ifp->lock);
3177 static void addrconf_dad_run(struct inet6_dev *idev)
3179 struct inet6_ifaddr *ifp;
3181 read_lock_bh(&idev->lock);
3182 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3183 spin_lock(&ifp->lock);
3184 if (ifp->flags & IFA_F_TENTATIVE &&
3185 ifp->state == INET6_IFADDR_STATE_DAD)
3186 addrconf_dad_kick(ifp);
3187 spin_unlock(&ifp->lock);
3189 read_unlock_bh(&idev->lock);
3192 #ifdef CONFIG_PROC_FS
3193 struct if6_iter_state {
3194 struct seq_net_private p;
3199 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3201 struct inet6_ifaddr *ifa = NULL;
3202 struct if6_iter_state *state = seq->private;
3203 struct net *net = seq_file_net(seq);
3206 /* initial bucket if pos is 0 */
3212 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3213 struct hlist_node *n;
3214 hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket],
3216 if (!net_eq(dev_net(ifa->idev->dev), net))
3218 /* sync with offset */
3219 if (p < state->offset) {
3227 /* prepare for next bucket */
3234 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3235 struct inet6_ifaddr *ifa)
3237 struct if6_iter_state *state = seq->private;
3238 struct net *net = seq_file_net(seq);
3239 struct hlist_node *n = &ifa->addr_lst;
3241 hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst) {
3242 if (!net_eq(dev_net(ifa->idev->dev), net))
3248 while (++state->bucket < IN6_ADDR_HSIZE) {
3250 hlist_for_each_entry_rcu_bh(ifa, n,
3251 &inet6_addr_lst[state->bucket], addr_lst) {
3252 if (!net_eq(dev_net(ifa->idev->dev), net))
3262 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3266 return if6_get_first(seq, *pos);
3269 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3271 struct inet6_ifaddr *ifa;
3273 ifa = if6_get_next(seq, v);
3278 static void if6_seq_stop(struct seq_file *seq, void *v)
3281 rcu_read_unlock_bh();
3284 static int if6_seq_show(struct seq_file *seq, void *v)
3286 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3287 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3289 ifp->idev->dev->ifindex,
3293 ifp->idev->dev->name);
3297 static const struct seq_operations if6_seq_ops = {
3298 .start = if6_seq_start,
3299 .next = if6_seq_next,
3300 .show = if6_seq_show,
3301 .stop = if6_seq_stop,
3304 static int if6_seq_open(struct inode *inode, struct file *file)
3306 return seq_open_net(inode, file, &if6_seq_ops,
3307 sizeof(struct if6_iter_state));
3310 static const struct file_operations if6_fops = {
3311 .owner = THIS_MODULE,
3312 .open = if6_seq_open,
3314 .llseek = seq_lseek,
3315 .release = seq_release_net,
3318 static int __net_init if6_proc_net_init(struct net *net)
3320 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
3325 static void __net_exit if6_proc_net_exit(struct net *net)
3327 proc_net_remove(net, "if_inet6");
3330 static struct pernet_operations if6_proc_net_ops = {
3331 .init = if6_proc_net_init,
3332 .exit = if6_proc_net_exit,
3335 int __init if6_proc_init(void)
3337 return register_pernet_subsys(&if6_proc_net_ops);
3340 void if6_proc_exit(void)
3342 unregister_pernet_subsys(&if6_proc_net_ops);
3344 #endif /* CONFIG_PROC_FS */
3346 #if IS_ENABLED(CONFIG_IPV6_MIP6)
3347 /* Check if address is a home address configured on any interface. */
3348 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3351 struct inet6_ifaddr *ifp = NULL;
3352 struct hlist_node *n;
3353 unsigned int hash = inet6_addr_hash(addr);
3356 hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) {
3357 if (!net_eq(dev_net(ifp->idev->dev), net))
3359 if (ipv6_addr_equal(&ifp->addr, addr) &&
3360 (ifp->flags & IFA_F_HOMEADDRESS)) {
3365 rcu_read_unlock_bh();
3371 * Periodic address status verification
3374 static void addrconf_verify(unsigned long foo)
3376 unsigned long now, next, next_sec, next_sched;
3377 struct inet6_ifaddr *ifp;
3378 struct hlist_node *node;
3382 spin_lock(&addrconf_verify_lock);
3384 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3386 del_timer(&addr_chk_timer);
3388 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3390 hlist_for_each_entry_rcu_bh(ifp, node,
3391 &inet6_addr_lst[i], addr_lst) {
3394 if (ifp->flags & IFA_F_PERMANENT)
3397 spin_lock(&ifp->lock);
3398 /* We try to batch several events at once. */
3399 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3401 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3402 age >= ifp->valid_lft) {
3403 spin_unlock(&ifp->lock);
3407 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3408 spin_unlock(&ifp->lock);
3410 } else if (age >= ifp->prefered_lft) {
3411 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3414 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3416 ifp->flags |= IFA_F_DEPRECATED;
3419 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3420 next = ifp->tstamp + ifp->valid_lft * HZ;
3422 spin_unlock(&ifp->lock);
3427 ipv6_ifa_notify(0, ifp);
3431 #ifdef CONFIG_IPV6_PRIVACY
3432 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3433 !(ifp->flags&IFA_F_TENTATIVE)) {
3434 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3435 ifp->idev->cnf.dad_transmits *
3436 ifp->idev->nd_parms->retrans_time / HZ;
3438 if (age >= ifp->prefered_lft - regen_advance) {
3439 struct inet6_ifaddr *ifpub = ifp->ifpub;
3440 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3441 next = ifp->tstamp + ifp->prefered_lft * HZ;
3442 if (!ifp->regen_count && ifpub) {
3445 in6_ifa_hold(ifpub);
3446 spin_unlock(&ifp->lock);
3448 spin_lock(&ifpub->lock);
3449 ifpub->regen_count = 0;
3450 spin_unlock(&ifpub->lock);
3451 ipv6_create_tempaddr(ifpub, ifp);
3456 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3457 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3458 spin_unlock(&ifp->lock);
3461 /* ifp->prefered_lft <= ifp->valid_lft */
3462 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3463 next = ifp->tstamp + ifp->prefered_lft * HZ;
3464 spin_unlock(&ifp->lock);
3469 next_sec = round_jiffies_up(next);
3472 /* If rounded timeout is accurate enough, accept it. */
3473 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3474 next_sched = next_sec;
3476 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3477 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3478 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3480 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3481 now, next, next_sec, next_sched));
3483 addr_chk_timer.expires = next_sched;
3484 add_timer(&addr_chk_timer);
3485 spin_unlock(&addrconf_verify_lock);
3486 rcu_read_unlock_bh();
3489 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3491 struct in6_addr *pfx = NULL;
3494 pfx = nla_data(addr);
3497 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3500 pfx = nla_data(local);
3506 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3507 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3508 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3509 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3513 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3515 struct net *net = sock_net(skb->sk);
3516 struct ifaddrmsg *ifm;
3517 struct nlattr *tb[IFA_MAX+1];
3518 struct in6_addr *pfx;
3521 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3525 ifm = nlmsg_data(nlh);
3526 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3530 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3533 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3534 u32 prefered_lft, u32 valid_lft)
3538 unsigned long timeout;
3540 if (!valid_lft || (prefered_lft > valid_lft))
3543 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3544 if (addrconf_finite_timeout(timeout)) {
3545 expires = jiffies_to_clock_t(timeout * HZ);
3546 valid_lft = timeout;
3547 flags = RTF_EXPIRES;
3551 ifa_flags |= IFA_F_PERMANENT;
3554 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3555 if (addrconf_finite_timeout(timeout)) {
3557 ifa_flags |= IFA_F_DEPRECATED;
3558 prefered_lft = timeout;
3561 spin_lock_bh(&ifp->lock);
3562 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3563 ifp->tstamp = jiffies;
3564 ifp->valid_lft = valid_lft;
3565 ifp->prefered_lft = prefered_lft;
3567 spin_unlock_bh(&ifp->lock);
3568 if (!(ifp->flags&IFA_F_TENTATIVE))
3569 ipv6_ifa_notify(0, ifp);
3571 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3579 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3581 struct net *net = sock_net(skb->sk);
3582 struct ifaddrmsg *ifm;
3583 struct nlattr *tb[IFA_MAX+1];
3584 struct in6_addr *pfx;
3585 struct inet6_ifaddr *ifa;
3586 struct net_device *dev;
3587 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3591 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3595 ifm = nlmsg_data(nlh);
3596 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3600 if (tb[IFA_CACHEINFO]) {
3601 struct ifa_cacheinfo *ci;
3603 ci = nla_data(tb[IFA_CACHEINFO]);
3604 valid_lft = ci->ifa_valid;
3605 preferred_lft = ci->ifa_prefered;
3607 preferred_lft = INFINITY_LIFE_TIME;
3608 valid_lft = INFINITY_LIFE_TIME;
3611 dev = __dev_get_by_index(net, ifm->ifa_index);
3615 /* We ignore other flags so far. */
3616 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3618 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3621 * It would be best to check for !NLM_F_CREATE here but
3622 * userspace alreay relies on not having to provide this.
3624 return inet6_addr_add(net, ifm->ifa_index, pfx,
3625 ifm->ifa_prefixlen, ifa_flags,
3626 preferred_lft, valid_lft);
3629 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3630 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3633 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3640 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3641 u8 scope, int ifindex)
3643 struct ifaddrmsg *ifm;
3645 ifm = nlmsg_data(nlh);
3646 ifm->ifa_family = AF_INET6;
3647 ifm->ifa_prefixlen = prefixlen;
3648 ifm->ifa_flags = flags;
3649 ifm->ifa_scope = scope;
3650 ifm->ifa_index = ifindex;
3653 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3654 unsigned long tstamp, u32 preferred, u32 valid)
3656 struct ifa_cacheinfo ci;
3658 ci.cstamp = cstamp_delta(cstamp);
3659 ci.tstamp = cstamp_delta(tstamp);
3660 ci.ifa_prefered = preferred;
3661 ci.ifa_valid = valid;
3663 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3666 static inline int rt_scope(int ifa_scope)
3668 if (ifa_scope & IFA_HOST)
3669 return RT_SCOPE_HOST;
3670 else if (ifa_scope & IFA_LINK)
3671 return RT_SCOPE_LINK;
3672 else if (ifa_scope & IFA_SITE)
3673 return RT_SCOPE_SITE;
3675 return RT_SCOPE_UNIVERSE;
3678 static inline int inet6_ifaddr_msgsize(void)
3680 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3681 + nla_total_size(16) /* IFA_ADDRESS */
3682 + nla_total_size(sizeof(struct ifa_cacheinfo));
3685 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3686 u32 portid, u32 seq, int event, unsigned int flags)
3688 struct nlmsghdr *nlh;
3689 u32 preferred, valid;
3691 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3695 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3696 ifa->idev->dev->ifindex);
3698 if (!(ifa->flags&IFA_F_PERMANENT)) {
3699 preferred = ifa->prefered_lft;
3700 valid = ifa->valid_lft;
3701 if (preferred != INFINITY_LIFE_TIME) {
3702 long tval = (jiffies - ifa->tstamp)/HZ;
3703 if (preferred > tval)
3707 if (valid != INFINITY_LIFE_TIME) {
3715 preferred = INFINITY_LIFE_TIME;
3716 valid = INFINITY_LIFE_TIME;
3719 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3720 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3721 nlmsg_cancel(skb, nlh);
3725 return nlmsg_end(skb, nlh);
3728 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3729 u32 portid, u32 seq, int event, u16 flags)
3731 struct nlmsghdr *nlh;
3732 u8 scope = RT_SCOPE_UNIVERSE;
3733 int ifindex = ifmca->idev->dev->ifindex;
3735 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3736 scope = RT_SCOPE_SITE;
3738 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3742 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3743 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3744 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3745 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3746 nlmsg_cancel(skb, nlh);
3750 return nlmsg_end(skb, nlh);
3753 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3754 u32 portid, u32 seq, int event, unsigned int flags)
3756 struct nlmsghdr *nlh;
3757 u8 scope = RT_SCOPE_UNIVERSE;
3758 int ifindex = ifaca->aca_idev->dev->ifindex;
3760 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3761 scope = RT_SCOPE_SITE;
3763 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3767 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3768 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3769 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3770 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3771 nlmsg_cancel(skb, nlh);
3775 return nlmsg_end(skb, nlh);
3784 /* called with rcu_read_lock() */
3785 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3786 struct netlink_callback *cb, enum addr_type_t type,
3787 int s_ip_idx, int *p_ip_idx)
3789 struct ifmcaddr6 *ifmca;
3790 struct ifacaddr6 *ifaca;
3792 int ip_idx = *p_ip_idx;
3794 read_lock_bh(&idev->lock);
3796 case UNICAST_ADDR: {
3797 struct inet6_ifaddr *ifa;
3799 /* unicast address incl. temp addr */
3800 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3801 if (++ip_idx < s_ip_idx)
3803 err = inet6_fill_ifaddr(skb, ifa,
3804 NETLINK_CB(cb->skb).portid,
3813 case MULTICAST_ADDR:
3814 /* multicast address */
3815 for (ifmca = idev->mc_list; ifmca;
3816 ifmca = ifmca->next, ip_idx++) {
3817 if (ip_idx < s_ip_idx)
3819 err = inet6_fill_ifmcaddr(skb, ifmca,
3820 NETLINK_CB(cb->skb).portid,
3829 /* anycast address */
3830 for (ifaca = idev->ac_list; ifaca;
3831 ifaca = ifaca->aca_next, ip_idx++) {
3832 if (ip_idx < s_ip_idx)
3834 err = inet6_fill_ifacaddr(skb, ifaca,
3835 NETLINK_CB(cb->skb).portid,
3846 read_unlock_bh(&idev->lock);
3851 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3852 enum addr_type_t type)
3854 struct net *net = sock_net(skb->sk);
3857 int s_idx, s_ip_idx;
3858 struct net_device *dev;
3859 struct inet6_dev *idev;
3860 struct hlist_head *head;
3861 struct hlist_node *node;
3864 s_idx = idx = cb->args[1];
3865 s_ip_idx = ip_idx = cb->args[2];
3868 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3870 head = &net->dev_index_head[h];
3871 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3874 if (h > s_h || idx > s_idx)
3877 idev = __in6_dev_get(dev);
3881 if (in6_dump_addrs(idev, skb, cb, type,
3882 s_ip_idx, &ip_idx) <= 0)
3892 cb->args[2] = ip_idx;
3897 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3899 enum addr_type_t type = UNICAST_ADDR;
3901 return inet6_dump_addr(skb, cb, type);
3904 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3906 enum addr_type_t type = MULTICAST_ADDR;
3908 return inet6_dump_addr(skb, cb, type);
3912 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3914 enum addr_type_t type = ANYCAST_ADDR;
3916 return inet6_dump_addr(skb, cb, type);
3919 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
3922 struct net *net = sock_net(in_skb->sk);
3923 struct ifaddrmsg *ifm;
3924 struct nlattr *tb[IFA_MAX+1];
3925 struct in6_addr *addr = NULL;
3926 struct net_device *dev = NULL;
3927 struct inet6_ifaddr *ifa;
3928 struct sk_buff *skb;
3931 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3935 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3941 ifm = nlmsg_data(nlh);
3943 dev = __dev_get_by_index(net, ifm->ifa_index);
3945 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
3947 err = -EADDRNOTAVAIL;
3951 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
3957 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
3958 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3960 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3961 WARN_ON(err == -EMSGSIZE);
3965 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
3972 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3974 struct sk_buff *skb;
3975 struct net *net = dev_net(ifa->idev->dev);
3978 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3982 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3984 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3985 WARN_ON(err == -EMSGSIZE);
3989 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3993 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3996 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3997 __s32 *array, int bytes)
3999 BUG_ON(bytes < (DEVCONF_MAX * 4));
4001 memset(array, 0, bytes);
4002 array[DEVCONF_FORWARDING] = cnf->forwarding;
4003 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4004 array[DEVCONF_MTU6] = cnf->mtu6;
4005 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4006 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4007 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4008 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4009 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4010 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4011 jiffies_to_msecs(cnf->rtr_solicit_interval);
4012 array[DEVCONF_RTR_SOLICIT_DELAY] =
4013 jiffies_to_msecs(cnf->rtr_solicit_delay);
4014 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4015 #ifdef CONFIG_IPV6_PRIVACY
4016 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4017 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4018 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4019 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4020 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4022 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4023 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4024 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4025 #ifdef CONFIG_IPV6_ROUTER_PREF
4026 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4027 array[DEVCONF_RTR_PROBE_INTERVAL] =
4028 jiffies_to_msecs(cnf->rtr_probe_interval);
4029 #ifdef CONFIG_IPV6_ROUTE_INFO
4030 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4033 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4034 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4035 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4036 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4038 #ifdef CONFIG_IPV6_MROUTE
4039 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4041 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4042 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4043 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4044 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4047 static inline size_t inet6_ifla6_size(void)
4049 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4050 + nla_total_size(sizeof(struct ifla_cacheinfo))
4051 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4052 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4053 + nla_total_size(ICMP6_MIB_MAX * 8); /* IFLA_INET6_ICMP6STATS */
4056 static inline size_t inet6_if_nlmsg_size(void)
4058 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4059 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4060 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4061 + nla_total_size(4) /* IFLA_MTU */
4062 + nla_total_size(4) /* IFLA_LINK */
4063 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4066 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4067 int items, int bytes)
4070 int pad = bytes - sizeof(u64) * items;
4073 /* Use put_unaligned() because stats may not be aligned for u64. */
4074 put_unaligned(items, &stats[0]);
4075 for (i = 1; i < items; i++)
4076 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4078 memset(&stats[items], 0, pad);
4081 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
4082 int items, int bytes, size_t syncpoff)
4085 int pad = bytes - sizeof(u64) * items;
4088 /* Use put_unaligned() because stats may not be aligned for u64. */
4089 put_unaligned(items, &stats[0]);
4090 for (i = 1; i < items; i++)
4091 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4093 memset(&stats[items], 0, pad);
4096 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4100 case IFLA_INET6_STATS:
4101 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
4102 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
4104 case IFLA_INET6_ICMP6STATS:
4105 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
4110 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4113 struct ifla_cacheinfo ci;
4115 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4116 goto nla_put_failure;
4117 ci.max_reasm_len = IPV6_MAXPLEN;
4118 ci.tstamp = cstamp_delta(idev->tstamp);
4119 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4120 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
4121 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4122 goto nla_put_failure;
4123 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4125 goto nla_put_failure;
4126 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4128 /* XXX - MC not implemented */
4130 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4132 goto nla_put_failure;
4133 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4135 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4137 goto nla_put_failure;
4138 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4146 static size_t inet6_get_link_af_size(const struct net_device *dev)
4148 if (!__in6_dev_get(dev))
4151 return inet6_ifla6_size();
4154 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4156 struct inet6_dev *idev = __in6_dev_get(dev);
4161 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4167 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4168 u32 portid, u32 seq, int event, unsigned int flags)
4170 struct net_device *dev = idev->dev;
4171 struct ifinfomsg *hdr;
4172 struct nlmsghdr *nlh;
4175 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
4179 hdr = nlmsg_data(nlh);
4180 hdr->ifi_family = AF_INET6;
4182 hdr->ifi_type = dev->type;
4183 hdr->ifi_index = dev->ifindex;
4184 hdr->ifi_flags = dev_get_flags(dev);
4185 hdr->ifi_change = 0;
4187 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4189 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4190 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4191 (dev->ifindex != dev->iflink &&
4192 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4193 goto nla_put_failure;
4194 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4195 if (protoinfo == NULL)
4196 goto nla_put_failure;
4198 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4199 goto nla_put_failure;
4201 nla_nest_end(skb, protoinfo);
4202 return nlmsg_end(skb, nlh);
4205 nlmsg_cancel(skb, nlh);
4209 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4211 struct net *net = sock_net(skb->sk);
4214 struct net_device *dev;
4215 struct inet6_dev *idev;
4216 struct hlist_head *head;
4217 struct hlist_node *node;
4220 s_idx = cb->args[1];
4223 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4225 head = &net->dev_index_head[h];
4226 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
4229 idev = __in6_dev_get(dev);
4232 if (inet6_fill_ifinfo(skb, idev,
4233 NETLINK_CB(cb->skb).portid,
4235 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4249 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4251 struct sk_buff *skb;
4252 struct net *net = dev_net(idev->dev);
4255 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4259 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4261 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4262 WARN_ON(err == -EMSGSIZE);
4266 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4270 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4273 static inline size_t inet6_prefix_nlmsg_size(void)
4275 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4276 + nla_total_size(sizeof(struct in6_addr))
4277 + nla_total_size(sizeof(struct prefix_cacheinfo));
4280 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4281 struct prefix_info *pinfo, u32 portid, u32 seq,
4282 int event, unsigned int flags)
4284 struct prefixmsg *pmsg;
4285 struct nlmsghdr *nlh;
4286 struct prefix_cacheinfo ci;
4288 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
4292 pmsg = nlmsg_data(nlh);
4293 pmsg->prefix_family = AF_INET6;
4294 pmsg->prefix_pad1 = 0;
4295 pmsg->prefix_pad2 = 0;
4296 pmsg->prefix_ifindex = idev->dev->ifindex;
4297 pmsg->prefix_len = pinfo->prefix_len;
4298 pmsg->prefix_type = pinfo->type;
4299 pmsg->prefix_pad3 = 0;
4300 pmsg->prefix_flags = 0;
4302 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4303 if (pinfo->autoconf)
4304 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4306 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4307 goto nla_put_failure;
4308 ci.preferred_time = ntohl(pinfo->prefered);
4309 ci.valid_time = ntohl(pinfo->valid);
4310 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4311 goto nla_put_failure;
4312 return nlmsg_end(skb, nlh);
4315 nlmsg_cancel(skb, nlh);
4319 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4320 struct prefix_info *pinfo)
4322 struct sk_buff *skb;
4323 struct net *net = dev_net(idev->dev);
4326 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4330 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4332 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4333 WARN_ON(err == -EMSGSIZE);
4337 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4341 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4344 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4346 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4351 * If the address was optimistic
4352 * we inserted the route at the start of
4353 * our DAD process, so we don't need
4356 if (!(ifp->rt->rt6i_node))
4357 ip6_ins_rt(ifp->rt);
4358 if (ifp->idev->cnf.forwarding)
4359 addrconf_join_anycast(ifp);
4362 if (ifp->idev->cnf.forwarding)
4363 addrconf_leave_anycast(ifp);
4364 addrconf_leave_solict(ifp->idev, &ifp->addr);
4365 dst_hold(&ifp->rt->dst);
4367 if (ip6_del_rt(ifp->rt))
4368 dst_free(&ifp->rt->dst);
4373 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4376 if (likely(ifp->idev->dead == 0))
4377 __ipv6_ifa_notify(event, ifp);
4378 rcu_read_unlock_bh();
4381 #ifdef CONFIG_SYSCTL
4384 int addrconf_sysctl_forward(ctl_table *ctl, int write,
4385 void __user *buffer, size_t *lenp, loff_t *ppos)
4387 int *valp = ctl->data;
4394 * ctl->data points to idev->cnf.forwarding, we should
4395 * not modify it until we get the rtnl lock.
4400 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4403 ret = addrconf_fixup_forwarding(ctl, valp, val);
4409 static void dev_disable_change(struct inet6_dev *idev)
4411 if (!idev || !idev->dev)
4414 if (idev->cnf.disable_ipv6)
4415 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4417 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4420 static void addrconf_disable_change(struct net *net, __s32 newf)
4422 struct net_device *dev;
4423 struct inet6_dev *idev;
4426 for_each_netdev_rcu(net, dev) {
4427 idev = __in6_dev_get(dev);
4429 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4430 idev->cnf.disable_ipv6 = newf;
4432 dev_disable_change(idev);
4438 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
4443 if (!rtnl_trylock())
4444 return restart_syscall();
4446 net = (struct net *)table->extra2;
4450 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4455 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4456 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4457 addrconf_disable_change(net, newf);
4458 } else if ((!newf) ^ (!old))
4459 dev_disable_change((struct inet6_dev *)table->extra1);
4466 int addrconf_sysctl_disable(ctl_table *ctl, int write,
4467 void __user *buffer, size_t *lenp, loff_t *ppos)
4469 int *valp = ctl->data;
4476 * ctl->data points to idev->cnf.disable_ipv6, we should
4477 * not modify it until we get the rtnl lock.
4482 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4485 ret = addrconf_disable_ipv6(ctl, valp, val);
4491 static struct addrconf_sysctl_table
4493 struct ctl_table_header *sysctl_header;
4494 ctl_table addrconf_vars[DEVCONF_MAX+1];
4495 } addrconf_sysctl __read_mostly = {
4496 .sysctl_header = NULL,
4499 .procname = "forwarding",
4500 .data = &ipv6_devconf.forwarding,
4501 .maxlen = sizeof(int),
4503 .proc_handler = addrconf_sysctl_forward,
4506 .procname = "hop_limit",
4507 .data = &ipv6_devconf.hop_limit,
4508 .maxlen = sizeof(int),
4510 .proc_handler = proc_dointvec,
4514 .data = &ipv6_devconf.mtu6,
4515 .maxlen = sizeof(int),
4517 .proc_handler = proc_dointvec,
4520 .procname = "accept_ra",
4521 .data = &ipv6_devconf.accept_ra,
4522 .maxlen = sizeof(int),
4524 .proc_handler = proc_dointvec,
4527 .procname = "accept_redirects",
4528 .data = &ipv6_devconf.accept_redirects,
4529 .maxlen = sizeof(int),
4531 .proc_handler = proc_dointvec,
4534 .procname = "autoconf",
4535 .data = &ipv6_devconf.autoconf,
4536 .maxlen = sizeof(int),
4538 .proc_handler = proc_dointvec,
4541 .procname = "dad_transmits",
4542 .data = &ipv6_devconf.dad_transmits,
4543 .maxlen = sizeof(int),
4545 .proc_handler = proc_dointvec,
4548 .procname = "router_solicitations",
4549 .data = &ipv6_devconf.rtr_solicits,
4550 .maxlen = sizeof(int),
4552 .proc_handler = proc_dointvec,
4555 .procname = "router_solicitation_interval",
4556 .data = &ipv6_devconf.rtr_solicit_interval,
4557 .maxlen = sizeof(int),
4559 .proc_handler = proc_dointvec_jiffies,
4562 .procname = "router_solicitation_delay",
4563 .data = &ipv6_devconf.rtr_solicit_delay,
4564 .maxlen = sizeof(int),
4566 .proc_handler = proc_dointvec_jiffies,
4569 .procname = "force_mld_version",
4570 .data = &ipv6_devconf.force_mld_version,
4571 .maxlen = sizeof(int),
4573 .proc_handler = proc_dointvec,
4575 #ifdef CONFIG_IPV6_PRIVACY
4577 .procname = "use_tempaddr",
4578 .data = &ipv6_devconf.use_tempaddr,
4579 .maxlen = sizeof(int),
4581 .proc_handler = proc_dointvec,
4584 .procname = "temp_valid_lft",
4585 .data = &ipv6_devconf.temp_valid_lft,
4586 .maxlen = sizeof(int),
4588 .proc_handler = proc_dointvec,
4591 .procname = "temp_prefered_lft",
4592 .data = &ipv6_devconf.temp_prefered_lft,
4593 .maxlen = sizeof(int),
4595 .proc_handler = proc_dointvec,
4598 .procname = "regen_max_retry",
4599 .data = &ipv6_devconf.regen_max_retry,
4600 .maxlen = sizeof(int),
4602 .proc_handler = proc_dointvec,
4605 .procname = "max_desync_factor",
4606 .data = &ipv6_devconf.max_desync_factor,
4607 .maxlen = sizeof(int),
4609 .proc_handler = proc_dointvec,
4613 .procname = "max_addresses",
4614 .data = &ipv6_devconf.max_addresses,
4615 .maxlen = sizeof(int),
4617 .proc_handler = proc_dointvec,
4620 .procname = "accept_ra_defrtr",
4621 .data = &ipv6_devconf.accept_ra_defrtr,
4622 .maxlen = sizeof(int),
4624 .proc_handler = proc_dointvec,
4627 .procname = "accept_ra_pinfo",
4628 .data = &ipv6_devconf.accept_ra_pinfo,
4629 .maxlen = sizeof(int),
4631 .proc_handler = proc_dointvec,
4633 #ifdef CONFIG_IPV6_ROUTER_PREF
4635 .procname = "accept_ra_rtr_pref",
4636 .data = &ipv6_devconf.accept_ra_rtr_pref,
4637 .maxlen = sizeof(int),
4639 .proc_handler = proc_dointvec,
4642 .procname = "router_probe_interval",
4643 .data = &ipv6_devconf.rtr_probe_interval,
4644 .maxlen = sizeof(int),
4646 .proc_handler = proc_dointvec_jiffies,
4648 #ifdef CONFIG_IPV6_ROUTE_INFO
4650 .procname = "accept_ra_rt_info_max_plen",
4651 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4652 .maxlen = sizeof(int),
4654 .proc_handler = proc_dointvec,
4659 .procname = "proxy_ndp",
4660 .data = &ipv6_devconf.proxy_ndp,
4661 .maxlen = sizeof(int),
4663 .proc_handler = proc_dointvec,
4666 .procname = "accept_source_route",
4667 .data = &ipv6_devconf.accept_source_route,
4668 .maxlen = sizeof(int),
4670 .proc_handler = proc_dointvec,
4672 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4674 .procname = "optimistic_dad",
4675 .data = &ipv6_devconf.optimistic_dad,
4676 .maxlen = sizeof(int),
4678 .proc_handler = proc_dointvec,
4682 #ifdef CONFIG_IPV6_MROUTE
4684 .procname = "mc_forwarding",
4685 .data = &ipv6_devconf.mc_forwarding,
4686 .maxlen = sizeof(int),
4688 .proc_handler = proc_dointvec,
4692 .procname = "disable_ipv6",
4693 .data = &ipv6_devconf.disable_ipv6,
4694 .maxlen = sizeof(int),
4696 .proc_handler = addrconf_sysctl_disable,
4699 .procname = "accept_dad",
4700 .data = &ipv6_devconf.accept_dad,
4701 .maxlen = sizeof(int),
4703 .proc_handler = proc_dointvec,
4706 .procname = "force_tllao",
4707 .data = &ipv6_devconf.force_tllao,
4708 .maxlen = sizeof(int),
4710 .proc_handler = proc_dointvec
4713 .procname = "ndisc_notify",
4714 .data = &ipv6_devconf.ndisc_notify,
4715 .maxlen = sizeof(int),
4717 .proc_handler = proc_dointvec
4725 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4726 struct inet6_dev *idev, struct ipv6_devconf *p)
4729 struct addrconf_sysctl_table *t;
4730 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
4732 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4736 for (i = 0; t->addrconf_vars[i].data; i++) {
4737 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
4738 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4739 t->addrconf_vars[i].extra2 = net;
4742 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
4744 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
4745 if (t->sysctl_header == NULL)
4757 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4759 struct addrconf_sysctl_table *t;
4761 if (p->sysctl == NULL)
4766 unregister_net_sysctl_table(t->sysctl_header);
4770 static void addrconf_sysctl_register(struct inet6_dev *idev)
4772 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
4773 &ndisc_ifinfo_sysctl_change);
4774 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4778 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4780 __addrconf_sysctl_unregister(&idev->cnf);
4781 neigh_sysctl_unregister(idev->nd_parms);
4787 static int __net_init addrconf_init_net(struct net *net)
4790 struct ipv6_devconf *all, *dflt;
4793 all = &ipv6_devconf;
4794 dflt = &ipv6_devconf_dflt;
4796 if (!net_eq(net, &init_net)) {
4797 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4801 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4803 goto err_alloc_dflt;
4805 /* these will be inherited by all namespaces */
4806 dflt->autoconf = ipv6_defaults.autoconf;
4807 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
4810 net->ipv6.devconf_all = all;
4811 net->ipv6.devconf_dflt = dflt;
4813 #ifdef CONFIG_SYSCTL
4814 err = __addrconf_sysctl_register(net, "all", NULL, all);
4818 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
4824 #ifdef CONFIG_SYSCTL
4826 __addrconf_sysctl_unregister(all);
4836 static void __net_exit addrconf_exit_net(struct net *net)
4838 #ifdef CONFIG_SYSCTL
4839 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4840 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4842 if (!net_eq(net, &init_net)) {
4843 kfree(net->ipv6.devconf_dflt);
4844 kfree(net->ipv6.devconf_all);
4848 static struct pernet_operations addrconf_ops = {
4849 .init = addrconf_init_net,
4850 .exit = addrconf_exit_net,
4857 int register_inet6addr_notifier(struct notifier_block *nb)
4859 return atomic_notifier_chain_register(&inet6addr_chain, nb);
4861 EXPORT_SYMBOL(register_inet6addr_notifier);
4863 int unregister_inet6addr_notifier(struct notifier_block *nb)
4865 return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
4867 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4869 static struct rtnl_af_ops inet6_ops = {
4871 .fill_link_af = inet6_fill_link_af,
4872 .get_link_af_size = inet6_get_link_af_size,
4876 * Init / cleanup code
4879 int __init addrconf_init(void)
4883 err = ipv6_addr_label_init();
4885 pr_crit("%s: cannot initialize default policy table: %d\n",
4890 err = register_pernet_subsys(&addrconf_ops);
4894 /* The addrconf netdev notifier requires that loopback_dev
4895 * has it's ipv6 private information allocated and setup
4896 * before it can bring up and give link-local addresses
4897 * to other devices which are up.
4899 * Unfortunately, loopback_dev is not necessarily the first
4900 * entry in the global dev_base list of net devices. In fact,
4901 * it is likely to be the very last entry on that list.
4902 * So this causes the notifier registry below to try and
4903 * give link-local addresses to all devices besides loopback_dev
4904 * first, then loopback_dev, which cases all the non-loopback_dev
4905 * devices to fail to get a link-local address.
4907 * So, as a temporary fix, allocate the ipv6 structure for
4908 * loopback_dev first by hand.
4909 * Longer term, all of the dependencies ipv6 has upon the loopback
4910 * device and it being up should be removed.
4913 if (!ipv6_add_dev(init_net.loopback_dev))
4919 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4920 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
4922 register_netdevice_notifier(&ipv6_dev_notf);
4926 err = rtnl_af_register(&inet6_ops);
4930 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
4935 /* Only the first call to __rtnl_register can fail */
4936 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
4937 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
4938 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
4939 inet6_dump_ifaddr, NULL);
4940 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
4941 inet6_dump_ifmcaddr, NULL);
4942 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
4943 inet6_dump_ifacaddr, NULL);
4944 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
4947 ipv6_addr_label_rtnl_register();
4951 rtnl_af_unregister(&inet6_ops);
4953 unregister_netdevice_notifier(&ipv6_dev_notf);
4955 unregister_pernet_subsys(&addrconf_ops);
4957 ipv6_addr_label_cleanup();
4962 void addrconf_cleanup(void)
4964 struct net_device *dev;
4967 unregister_netdevice_notifier(&ipv6_dev_notf);
4968 unregister_pernet_subsys(&addrconf_ops);
4969 ipv6_addr_label_cleanup();
4973 __rtnl_af_unregister(&inet6_ops);
4975 /* clean dev list */
4976 for_each_netdev(&init_net, dev) {
4977 if (__in6_dev_get(dev) == NULL)
4979 addrconf_ifdown(dev, 1);
4981 addrconf_ifdown(init_net.loopback_dev, 2);
4986 spin_lock_bh(&addrconf_hash_lock);
4987 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4988 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
4989 spin_unlock_bh(&addrconf_hash_lock);
4991 del_timer(&addr_chk_timer);