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>
73 #include <net/firewire.h>
75 #include <net/protocol.h>
76 #include <net/ndisc.h>
77 #include <net/ip6_route.h>
78 #include <net/addrconf.h>
81 #include <net/netlink.h>
82 #include <net/pkt_sched.h>
83 #include <linux/if_tunnel.h>
84 #include <linux/rtnetlink.h>
85 #include <linux/netconf.h>
86 #include <linux/random.h>
87 #include <linux/uaccess.h>
88 #include <asm/unaligned.h>
90 #include <linux/proc_fs.h>
91 #include <linux/seq_file.h>
92 #include <linux/export.h>
94 /* Set to 3 to get tracing... */
98 #define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
100 #define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
103 #define INFINITY_LIFE_TIME 0xFFFFFFFF
105 static inline u32 cstamp_delta(unsigned long cstamp)
107 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
111 static void addrconf_sysctl_register(struct inet6_dev *idev);
112 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
114 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
118 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
123 static void __ipv6_regen_rndid(struct inet6_dev *idev);
124 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
125 static void ipv6_regen_rndid(unsigned long data);
127 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
128 static int ipv6_count_addresses(struct inet6_dev *idev);
131 * Configured unicast address hash table
133 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
134 static DEFINE_SPINLOCK(addrconf_hash_lock);
136 static void addrconf_verify(unsigned long);
138 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
139 static DEFINE_SPINLOCK(addrconf_verify_lock);
141 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
142 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
144 static void addrconf_type_change(struct net_device *dev,
145 unsigned long event);
146 static int addrconf_ifdown(struct net_device *dev, int how);
148 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
150 const struct net_device *dev,
151 u32 flags, u32 noflags);
153 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
154 static void addrconf_dad_timer(unsigned long data);
155 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
156 static void addrconf_dad_run(struct inet6_dev *idev);
157 static void addrconf_rs_timer(unsigned long data);
158 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
159 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
161 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
162 struct prefix_info *pinfo);
163 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
164 struct net_device *dev);
166 static struct ipv6_devconf ipv6_devconf __read_mostly = {
168 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
169 .mtu6 = IPV6_MIN_MTU,
171 .accept_redirects = 1,
173 .force_mld_version = 0,
174 .mldv1_unsolicited_report_interval = 10 * HZ,
175 .mldv2_unsolicited_report_interval = HZ,
177 .rtr_solicits = MAX_RTR_SOLICITATIONS,
178 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
179 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
181 .temp_valid_lft = TEMP_VALID_LIFETIME,
182 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
183 .regen_max_retry = REGEN_MAX_RETRY,
184 .max_desync_factor = MAX_DESYNC_FACTOR,
185 .max_addresses = IPV6_MAX_ADDRESSES,
186 .accept_ra_defrtr = 1,
187 .accept_ra_pinfo = 1,
188 #ifdef CONFIG_IPV6_ROUTER_PREF
189 .accept_ra_rtr_pref = 1,
190 .rtr_probe_interval = 60 * HZ,
191 #ifdef CONFIG_IPV6_ROUTE_INFO
192 .accept_ra_rt_info_max_plen = 0,
196 .accept_source_route = 0, /* we do not accept RH0 by default. */
199 .suppress_frag_ndisc = 1,
202 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
204 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
205 .mtu6 = IPV6_MIN_MTU,
207 .accept_redirects = 1,
209 .force_mld_version = 0,
210 .mldv1_unsolicited_report_interval = 10 * HZ,
211 .mldv2_unsolicited_report_interval = HZ,
213 .rtr_solicits = MAX_RTR_SOLICITATIONS,
214 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
215 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
217 .temp_valid_lft = TEMP_VALID_LIFETIME,
218 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
219 .regen_max_retry = REGEN_MAX_RETRY,
220 .max_desync_factor = MAX_DESYNC_FACTOR,
221 .max_addresses = IPV6_MAX_ADDRESSES,
222 .accept_ra_defrtr = 1,
223 .accept_ra_pinfo = 1,
224 #ifdef CONFIG_IPV6_ROUTER_PREF
225 .accept_ra_rtr_pref = 1,
226 .rtr_probe_interval = 60 * HZ,
227 #ifdef CONFIG_IPV6_ROUTE_INFO
228 .accept_ra_rt_info_max_plen = 0,
232 .accept_source_route = 0, /* we do not accept RH0 by default. */
235 .suppress_frag_ndisc = 1,
238 /* Check if a valid qdisc is available */
239 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
241 return !qdisc_tx_is_noop(dev);
244 static void addrconf_del_rs_timer(struct inet6_dev *idev)
246 if (del_timer(&idev->rs_timer))
250 static void addrconf_del_dad_timer(struct inet6_ifaddr *ifp)
252 if (del_timer(&ifp->dad_timer))
256 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
259 if (!timer_pending(&idev->rs_timer))
261 mod_timer(&idev->rs_timer, jiffies + when);
264 static void addrconf_mod_dad_timer(struct inet6_ifaddr *ifp,
267 if (!timer_pending(&ifp->dad_timer))
269 mod_timer(&ifp->dad_timer, jiffies + when);
272 static int snmp6_alloc_dev(struct inet6_dev *idev)
274 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
275 sizeof(struct ipstats_mib),
276 __alignof__(struct ipstats_mib)) < 0)
278 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
280 if (!idev->stats.icmpv6dev)
282 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
284 if (!idev->stats.icmpv6msgdev)
290 kfree(idev->stats.icmpv6dev);
292 snmp_mib_free((void __percpu **)idev->stats.ipv6);
297 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
299 struct inet6_dev *ndev;
303 if (dev->mtu < IPV6_MIN_MTU)
306 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
311 rwlock_init(&ndev->lock);
313 INIT_LIST_HEAD(&ndev->addr_list);
314 setup_timer(&ndev->rs_timer, addrconf_rs_timer,
315 (unsigned long)ndev);
316 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
317 ndev->cnf.mtu6 = dev->mtu;
318 ndev->cnf.sysctl = NULL;
319 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
320 if (ndev->nd_parms == NULL) {
324 if (ndev->cnf.forwarding)
325 dev_disable_lro(dev);
326 /* We refer to the device */
329 if (snmp6_alloc_dev(ndev) < 0) {
331 "%s: cannot allocate memory for statistics; dev=%s.\n",
332 __func__, dev->name);
333 neigh_parms_release(&nd_tbl, ndev->nd_parms);
339 if (snmp6_register_dev(ndev) < 0) {
341 "%s: cannot create /proc/net/dev_snmp6/%s\n",
342 __func__, dev->name);
343 neigh_parms_release(&nd_tbl, ndev->nd_parms);
345 in6_dev_finish_destroy(ndev);
349 /* One reference from device. We must do this before
350 * we invoke __ipv6_regen_rndid().
354 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
355 ndev->cnf.accept_dad = -1;
357 #if IS_ENABLED(CONFIG_IPV6_SIT)
358 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
359 pr_info("%s: Disabled Multicast RS\n", dev->name);
360 ndev->cnf.rtr_solicits = 0;
364 INIT_LIST_HEAD(&ndev->tempaddr_list);
365 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
366 if ((dev->flags&IFF_LOOPBACK) ||
367 dev->type == ARPHRD_TUNNEL ||
368 dev->type == ARPHRD_TUNNEL6 ||
369 dev->type == ARPHRD_SIT ||
370 dev->type == ARPHRD_NONE) {
371 ndev->cnf.use_tempaddr = -1;
374 ipv6_regen_rndid((unsigned long) ndev);
377 ndev->token = in6addr_any;
379 if (netif_running(dev) && addrconf_qdisc_ok(dev))
380 ndev->if_flags |= IF_READY;
382 ipv6_mc_init_dev(ndev);
383 ndev->tstamp = jiffies;
384 addrconf_sysctl_register(ndev);
385 /* protected by rtnl_lock */
386 rcu_assign_pointer(dev->ip6_ptr, ndev);
388 /* Join interface-local all-node multicast group */
389 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
391 /* Join all-node multicast group */
392 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
394 /* Join all-router multicast group if forwarding is set */
395 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
396 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
401 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
403 struct inet6_dev *idev;
407 idev = __in6_dev_get(dev);
409 idev = ipv6_add_dev(dev);
414 if (dev->flags&IFF_UP)
419 static int inet6_netconf_msgsize_devconf(int type)
421 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
422 + nla_total_size(4); /* NETCONFA_IFINDEX */
424 /* type -1 is used for ALL */
425 if (type == -1 || type == NETCONFA_FORWARDING)
426 size += nla_total_size(4);
427 #ifdef CONFIG_IPV6_MROUTE
428 if (type == -1 || type == NETCONFA_MC_FORWARDING)
429 size += nla_total_size(4);
435 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
436 struct ipv6_devconf *devconf, u32 portid,
437 u32 seq, int event, unsigned int flags,
440 struct nlmsghdr *nlh;
441 struct netconfmsg *ncm;
443 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
448 ncm = nlmsg_data(nlh);
449 ncm->ncm_family = AF_INET6;
451 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
452 goto nla_put_failure;
454 /* type -1 is used for ALL */
455 if ((type == -1 || type == NETCONFA_FORWARDING) &&
456 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
457 goto nla_put_failure;
458 #ifdef CONFIG_IPV6_MROUTE
459 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
460 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
461 devconf->mc_forwarding) < 0)
462 goto nla_put_failure;
464 return nlmsg_end(skb, nlh);
467 nlmsg_cancel(skb, nlh);
471 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
472 struct ipv6_devconf *devconf)
477 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
481 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
482 RTM_NEWNETCONF, 0, type);
484 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
485 WARN_ON(err == -EMSGSIZE);
489 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
492 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
495 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
496 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
497 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
500 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
501 struct nlmsghdr *nlh)
503 struct net *net = sock_net(in_skb->sk);
504 struct nlattr *tb[NETCONFA_MAX+1];
505 struct netconfmsg *ncm;
507 struct ipv6_devconf *devconf;
508 struct inet6_dev *in6_dev;
509 struct net_device *dev;
513 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
514 devconf_ipv6_policy);
519 if (!tb[NETCONFA_IFINDEX])
522 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
524 case NETCONFA_IFINDEX_ALL:
525 devconf = net->ipv6.devconf_all;
527 case NETCONFA_IFINDEX_DEFAULT:
528 devconf = net->ipv6.devconf_dflt;
531 dev = __dev_get_by_index(net, ifindex);
534 in6_dev = __in6_dev_get(dev);
537 devconf = &in6_dev->cnf;
542 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
546 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
547 NETLINK_CB(in_skb).portid,
548 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
551 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
552 WARN_ON(err == -EMSGSIZE);
556 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
561 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
562 struct netlink_callback *cb)
564 struct net *net = sock_net(skb->sk);
567 struct net_device *dev;
568 struct inet6_dev *idev;
569 struct hlist_head *head;
572 s_idx = idx = cb->args[1];
574 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
576 head = &net->dev_index_head[h];
578 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
580 hlist_for_each_entry_rcu(dev, head, index_hlist) {
583 idev = __in6_dev_get(dev);
587 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
589 NETLINK_CB(cb->skb).portid,
597 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
603 if (h == NETDEV_HASHENTRIES) {
604 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
605 net->ipv6.devconf_all,
606 NETLINK_CB(cb->skb).portid,
608 RTM_NEWNETCONF, NLM_F_MULTI,
614 if (h == NETDEV_HASHENTRIES + 1) {
615 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
616 net->ipv6.devconf_dflt,
617 NETLINK_CB(cb->skb).portid,
619 RTM_NEWNETCONF, NLM_F_MULTI,
633 static void dev_forward_change(struct inet6_dev *idev)
635 struct net_device *dev;
636 struct inet6_ifaddr *ifa;
641 if (idev->cnf.forwarding)
642 dev_disable_lro(dev);
643 if (dev->flags & IFF_MULTICAST) {
644 if (idev->cnf.forwarding) {
645 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
646 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
647 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
649 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
650 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
651 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
655 list_for_each_entry(ifa, &idev->addr_list, if_list) {
656 if (ifa->flags&IFA_F_TENTATIVE)
658 if (idev->cnf.forwarding)
659 addrconf_join_anycast(ifa);
661 addrconf_leave_anycast(ifa);
663 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
664 dev->ifindex, &idev->cnf);
668 static void addrconf_forward_change(struct net *net, __s32 newf)
670 struct net_device *dev;
671 struct inet6_dev *idev;
673 for_each_netdev(net, dev) {
674 idev = __in6_dev_get(dev);
676 int changed = (!idev->cnf.forwarding) ^ (!newf);
677 idev->cnf.forwarding = newf;
679 dev_forward_change(idev);
684 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
690 return restart_syscall();
692 net = (struct net *)table->extra2;
696 if (p == &net->ipv6.devconf_dflt->forwarding) {
697 if ((!newf) ^ (!old))
698 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
699 NETCONFA_IFINDEX_DEFAULT,
700 net->ipv6.devconf_dflt);
705 if (p == &net->ipv6.devconf_all->forwarding) {
706 net->ipv6.devconf_dflt->forwarding = newf;
707 addrconf_forward_change(net, newf);
708 if ((!newf) ^ (!old))
709 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
710 NETCONFA_IFINDEX_ALL,
711 net->ipv6.devconf_all);
712 } else if ((!newf) ^ (!old))
713 dev_forward_change((struct inet6_dev *)table->extra1);
717 rt6_purge_dflt_routers(net);
722 /* Nobody refers to this ifaddr, destroy it */
723 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
725 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
727 #ifdef NET_REFCNT_DEBUG
728 pr_debug("%s\n", __func__);
731 in6_dev_put(ifp->idev);
733 if (del_timer(&ifp->dad_timer))
734 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
736 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
737 pr_warn("Freeing alive inet6 address %p\n", ifp);
746 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
749 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
752 * Each device address list is sorted in order of scope -
753 * global before linklocal.
755 list_for_each(p, &idev->addr_list) {
756 struct inet6_ifaddr *ifa
757 = list_entry(p, struct inet6_ifaddr, if_list);
758 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
762 list_add_tail(&ifp->if_list, p);
765 static u32 inet6_addr_hash(const struct in6_addr *addr)
767 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
770 /* On success it returns ifp with increased reference count */
772 static struct inet6_ifaddr *
773 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
774 const struct in6_addr *peer_addr, int pfxlen,
775 int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
777 struct inet6_ifaddr *ifa = NULL;
781 int addr_type = ipv6_addr_type(addr);
783 if (addr_type == IPV6_ADDR_ANY ||
784 addr_type & IPV6_ADDR_MULTICAST ||
785 (!(idev->dev->flags & IFF_LOOPBACK) &&
786 addr_type & IPV6_ADDR_LOOPBACK))
787 return ERR_PTR(-EADDRNOTAVAIL);
791 err = -ENODEV; /*XXX*/
795 if (idev->cnf.disable_ipv6) {
800 spin_lock(&addrconf_hash_lock);
802 /* Ignore adding duplicate addresses on an interface */
803 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
804 ADBG("ipv6_add_addr: already assigned\n");
809 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
812 ADBG("ipv6_add_addr: malloc failed\n");
817 rt = addrconf_dst_alloc(idev, addr, false);
825 ifa->peer_addr = *peer_addr;
827 spin_lock_init(&ifa->lock);
828 spin_lock_init(&ifa->state_lock);
829 setup_timer(&ifa->dad_timer, addrconf_dad_timer,
831 INIT_HLIST_NODE(&ifa->addr_lst);
833 ifa->prefix_len = pfxlen;
834 ifa->flags = flags | IFA_F_TENTATIVE;
835 ifa->valid_lft = valid_lft;
836 ifa->prefered_lft = prefered_lft;
837 ifa->cstamp = ifa->tstamp = jiffies;
838 ifa->tokenized = false;
847 /* Add to big hash table */
848 hash = inet6_addr_hash(addr);
850 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
851 spin_unlock(&addrconf_hash_lock);
853 write_lock(&idev->lock);
854 /* Add to inet6_dev unicast addr list. */
855 ipv6_link_dev_addr(idev, ifa);
857 if (ifa->flags&IFA_F_TEMPORARY) {
858 list_add(&ifa->tmp_list, &idev->tempaddr_list);
863 write_unlock(&idev->lock);
865 rcu_read_unlock_bh();
867 if (likely(err == 0))
868 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
876 spin_unlock(&addrconf_hash_lock);
880 /* This function wants to get referenced ifp and releases it before return */
882 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
884 struct inet6_ifaddr *ifa, *ifn;
885 struct inet6_dev *idev = ifp->idev;
887 int deleted = 0, onlink = 0;
888 unsigned long expires = jiffies;
890 spin_lock_bh(&ifp->state_lock);
892 ifp->state = INET6_IFADDR_STATE_DEAD;
893 spin_unlock_bh(&ifp->state_lock);
895 if (state == INET6_IFADDR_STATE_DEAD)
898 spin_lock_bh(&addrconf_hash_lock);
899 hlist_del_init_rcu(&ifp->addr_lst);
900 spin_unlock_bh(&addrconf_hash_lock);
902 write_lock_bh(&idev->lock);
904 if (ifp->flags&IFA_F_TEMPORARY) {
905 list_del(&ifp->tmp_list);
907 in6_ifa_put(ifp->ifpub);
913 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
915 list_del_init(&ifp->if_list);
918 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
922 } else if (ifp->flags & IFA_F_PERMANENT) {
923 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
925 if (ifa->flags & IFA_F_PERMANENT) {
930 unsigned long lifetime;
935 spin_lock(&ifa->lock);
937 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
939 * Note: Because this address is
940 * not permanent, lifetime <
941 * LONG_MAX / HZ here.
943 if (time_before(expires,
944 ifa->tstamp + lifetime * HZ))
945 expires = ifa->tstamp + lifetime * HZ;
946 spin_unlock(&ifa->lock);
951 write_unlock_bh(&idev->lock);
953 addrconf_del_dad_timer(ifp);
955 ipv6_ifa_notify(RTM_DELADDR, ifp);
957 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
960 * Purge or update corresponding prefix
962 * 1) we don't purge prefix here if address was not permanent.
963 * prefix is managed by its own lifetime.
964 * 2) if there're no addresses, delete prefix.
965 * 3) if there're still other permanent address(es),
966 * corresponding prefix is still permanent.
967 * 4) otherwise, update prefix lifetime to the
968 * longest valid lifetime among the corresponding
969 * addresses on the device.
970 * Note: subsequent RA will update lifetime.
974 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
975 struct in6_addr prefix;
978 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
980 rt = addrconf_get_prefix_route(&prefix,
983 0, RTF_GATEWAY | RTF_DEFAULT);
989 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
990 rt6_set_expires(rt, expires);
996 /* clean up prefsrc entries */
997 rt6_remove_prefsrc(ifp);
1002 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1004 struct inet6_dev *idev = ifp->idev;
1005 struct in6_addr addr, *tmpaddr;
1006 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1007 unsigned long regen_advance;
1011 unsigned long now = jiffies;
1013 write_lock(&idev->lock);
1015 spin_lock_bh(&ift->lock);
1016 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1017 spin_unlock_bh(&ift->lock);
1024 if (idev->cnf.use_tempaddr <= 0) {
1025 write_unlock(&idev->lock);
1026 pr_info("%s: use_tempaddr is disabled\n", __func__);
1031 spin_lock_bh(&ifp->lock);
1032 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1033 idev->cnf.use_tempaddr = -1; /*XXX*/
1034 spin_unlock_bh(&ifp->lock);
1035 write_unlock(&idev->lock);
1036 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1043 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1044 __ipv6_try_regen_rndid(idev, tmpaddr);
1045 memcpy(&addr.s6_addr[8], idev->rndid, 8);
1046 age = (now - ifp->tstamp) / HZ;
1047 tmp_valid_lft = min_t(__u32,
1049 idev->cnf.temp_valid_lft + age);
1050 tmp_prefered_lft = min_t(__u32,
1052 idev->cnf.temp_prefered_lft + age -
1053 idev->cnf.max_desync_factor);
1054 tmp_plen = ifp->prefix_len;
1055 tmp_tstamp = ifp->tstamp;
1056 spin_unlock_bh(&ifp->lock);
1058 regen_advance = idev->cnf.regen_max_retry *
1059 idev->cnf.dad_transmits *
1060 idev->nd_parms->retrans_time / HZ;
1061 write_unlock(&idev->lock);
1063 /* A temporary address is created only if this calculated Preferred
1064 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1065 * an implementation must not create a temporary address with a zero
1066 * Preferred Lifetime.
1068 if (tmp_prefered_lft <= regen_advance) {
1075 addr_flags = IFA_F_TEMPORARY;
1076 /* set in addrconf_prefix_rcv() */
1077 if (ifp->flags & IFA_F_OPTIMISTIC)
1078 addr_flags |= IFA_F_OPTIMISTIC;
1080 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1081 ipv6_addr_scope(&addr), addr_flags,
1082 tmp_valid_lft, tmp_prefered_lft);
1086 pr_info("%s: retry temporary address regeneration\n", __func__);
1088 write_lock(&idev->lock);
1092 spin_lock_bh(&ift->lock);
1095 ift->tstamp = tmp_tstamp;
1096 spin_unlock_bh(&ift->lock);
1098 addrconf_dad_start(ift);
1106 * Choose an appropriate source address (RFC3484)
1109 IPV6_SADDR_RULE_INIT = 0,
1110 IPV6_SADDR_RULE_LOCAL,
1111 IPV6_SADDR_RULE_SCOPE,
1112 IPV6_SADDR_RULE_PREFERRED,
1113 #ifdef CONFIG_IPV6_MIP6
1114 IPV6_SADDR_RULE_HOA,
1116 IPV6_SADDR_RULE_OIF,
1117 IPV6_SADDR_RULE_LABEL,
1118 IPV6_SADDR_RULE_PRIVACY,
1119 IPV6_SADDR_RULE_ORCHID,
1120 IPV6_SADDR_RULE_PREFIX,
1124 struct ipv6_saddr_score {
1127 struct inet6_ifaddr *ifa;
1128 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1133 struct ipv6_saddr_dst {
1134 const struct in6_addr *addr;
1141 static inline int ipv6_saddr_preferred(int type)
1143 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1148 static int ipv6_get_saddr_eval(struct net *net,
1149 struct ipv6_saddr_score *score,
1150 struct ipv6_saddr_dst *dst,
1155 if (i <= score->rule) {
1157 case IPV6_SADDR_RULE_SCOPE:
1158 ret = score->scopedist;
1160 case IPV6_SADDR_RULE_PREFIX:
1161 ret = score->matchlen;
1164 ret = !!test_bit(i, score->scorebits);
1170 case IPV6_SADDR_RULE_INIT:
1171 /* Rule 0: remember if hiscore is not ready yet */
1174 case IPV6_SADDR_RULE_LOCAL:
1175 /* Rule 1: Prefer same address */
1176 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1178 case IPV6_SADDR_RULE_SCOPE:
1179 /* Rule 2: Prefer appropriate scope
1184 * ---+--+-+---> scope
1186 * | d is scope of the destination.
1188 * | \ <- smaller scope is better if
1189 * B-15 | \ if scope is enough for destinaion.
1190 * | ret = B - scope (-1 <= scope >= d <= 15).
1192 * |/ <- greater is better
1193 * -C / if scope is not enough for destination.
1194 * /| ret = scope - C (-1 <= d < scope <= 15).
1196 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1197 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1198 * Assume B = 0 and we get C > 29.
1200 ret = __ipv6_addr_src_scope(score->addr_type);
1201 if (ret >= dst->scope)
1204 ret -= 128; /* 30 is enough */
1205 score->scopedist = ret;
1207 case IPV6_SADDR_RULE_PREFERRED:
1208 /* Rule 3: Avoid deprecated and optimistic addresses */
1209 ret = ipv6_saddr_preferred(score->addr_type) ||
1210 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1212 #ifdef CONFIG_IPV6_MIP6
1213 case IPV6_SADDR_RULE_HOA:
1215 /* Rule 4: Prefer home address */
1216 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1217 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1221 case IPV6_SADDR_RULE_OIF:
1222 /* Rule 5: Prefer outgoing interface */
1223 ret = (!dst->ifindex ||
1224 dst->ifindex == score->ifa->idev->dev->ifindex);
1226 case IPV6_SADDR_RULE_LABEL:
1227 /* Rule 6: Prefer matching label */
1228 ret = ipv6_addr_label(net,
1229 &score->ifa->addr, score->addr_type,
1230 score->ifa->idev->dev->ifindex) == dst->label;
1232 case IPV6_SADDR_RULE_PRIVACY:
1234 /* Rule 7: Prefer public address
1235 * Note: prefer temporary address if use_tempaddr >= 2
1237 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1238 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1239 score->ifa->idev->cnf.use_tempaddr >= 2;
1240 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1243 case IPV6_SADDR_RULE_ORCHID:
1244 /* Rule 8-: Prefer ORCHID vs ORCHID or
1245 * non-ORCHID vs non-ORCHID
1247 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1248 ipv6_addr_orchid(dst->addr));
1250 case IPV6_SADDR_RULE_PREFIX:
1251 /* Rule 8: Use longest matching prefix */
1252 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1253 if (ret > score->ifa->prefix_len)
1254 ret = score->ifa->prefix_len;
1255 score->matchlen = ret;
1262 __set_bit(i, score->scorebits);
1268 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1269 const struct in6_addr *daddr, unsigned int prefs,
1270 struct in6_addr *saddr)
1272 struct ipv6_saddr_score scores[2],
1273 *score = &scores[0], *hiscore = &scores[1];
1274 struct ipv6_saddr_dst dst;
1275 struct net_device *dev;
1278 dst_type = __ipv6_addr_type(daddr);
1280 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1281 dst.scope = __ipv6_addr_src_scope(dst_type);
1282 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1286 hiscore->ifa = NULL;
1290 for_each_netdev_rcu(net, dev) {
1291 struct inet6_dev *idev;
1293 /* Candidate Source Address (section 4)
1294 * - multicast and link-local destination address,
1295 * the set of candidate source address MUST only
1296 * include addresses assigned to interfaces
1297 * belonging to the same link as the outgoing
1299 * (- For site-local destination addresses, the
1300 * set of candidate source addresses MUST only
1301 * include addresses assigned to interfaces
1302 * belonging to the same site as the outgoing
1305 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1306 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1307 dst.ifindex && dev->ifindex != dst.ifindex)
1310 idev = __in6_dev_get(dev);
1314 read_lock_bh(&idev->lock);
1315 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1319 * - Tentative Address (RFC2462 section 5.4)
1320 * - A tentative address is not considered
1321 * "assigned to an interface" in the traditional
1322 * sense, unless it is also flagged as optimistic.
1323 * - Candidate Source Address (section 4)
1324 * - In any case, anycast addresses, multicast
1325 * addresses, and the unspecified address MUST
1326 * NOT be included in a candidate set.
1328 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1329 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1332 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1334 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1335 score->addr_type & IPV6_ADDR_MULTICAST)) {
1336 LIMIT_NETDEBUG(KERN_DEBUG
1337 "ADDRCONF: unspecified / multicast address "
1338 "assigned as unicast address on %s",
1344 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1346 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1347 int minihiscore, miniscore;
1349 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1350 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1352 if (minihiscore > miniscore) {
1353 if (i == IPV6_SADDR_RULE_SCOPE &&
1354 score->scopedist > 0) {
1357 * each remaining entry
1358 * has too small (not enough)
1359 * scope, because ifa entries
1360 * are sorted by their scope
1366 } else if (minihiscore < miniscore) {
1368 in6_ifa_put(hiscore->ifa);
1370 in6_ifa_hold(score->ifa);
1372 swap(hiscore, score);
1374 /* restore our iterator */
1375 score->ifa = hiscore->ifa;
1382 read_unlock_bh(&idev->lock);
1387 return -EADDRNOTAVAIL;
1389 *saddr = hiscore->ifa->addr;
1390 in6_ifa_put(hiscore->ifa);
1393 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1395 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1396 unsigned char banned_flags)
1398 struct inet6_ifaddr *ifp;
1399 int err = -EADDRNOTAVAIL;
1401 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1402 if (ifp->scope == IFA_LINK &&
1403 !(ifp->flags & banned_flags)) {
1412 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1413 unsigned char banned_flags)
1415 struct inet6_dev *idev;
1416 int err = -EADDRNOTAVAIL;
1419 idev = __in6_dev_get(dev);
1421 read_lock_bh(&idev->lock);
1422 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1423 read_unlock_bh(&idev->lock);
1429 static int ipv6_count_addresses(struct inet6_dev *idev)
1432 struct inet6_ifaddr *ifp;
1434 read_lock_bh(&idev->lock);
1435 list_for_each_entry(ifp, &idev->addr_list, if_list)
1437 read_unlock_bh(&idev->lock);
1441 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1442 const struct net_device *dev, int strict)
1444 struct inet6_ifaddr *ifp;
1445 unsigned int hash = inet6_addr_hash(addr);
1448 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1449 if (!net_eq(dev_net(ifp->idev->dev), net))
1451 if (ipv6_addr_equal(&ifp->addr, addr) &&
1452 !(ifp->flags&IFA_F_TENTATIVE) &&
1453 (dev == NULL || ifp->idev->dev == dev ||
1454 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1455 rcu_read_unlock_bh();
1460 rcu_read_unlock_bh();
1463 EXPORT_SYMBOL(ipv6_chk_addr);
1465 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1466 struct net_device *dev)
1468 unsigned int hash = inet6_addr_hash(addr);
1469 struct inet6_ifaddr *ifp;
1471 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1472 if (!net_eq(dev_net(ifp->idev->dev), net))
1474 if (ipv6_addr_equal(&ifp->addr, addr)) {
1475 if (dev == NULL || ifp->idev->dev == dev)
1482 /* Compares an address/prefix_len with addresses on device @dev.
1483 * If one is found it returns true.
1485 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1486 const unsigned int prefix_len, struct net_device *dev)
1488 struct inet6_dev *idev;
1489 struct inet6_ifaddr *ifa;
1493 idev = __in6_dev_get(dev);
1495 read_lock_bh(&idev->lock);
1496 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1497 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1501 read_unlock_bh(&idev->lock);
1507 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1509 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1511 struct inet6_dev *idev;
1512 struct inet6_ifaddr *ifa;
1517 idev = __in6_dev_get(dev);
1519 read_lock_bh(&idev->lock);
1520 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1521 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1526 read_unlock_bh(&idev->lock);
1531 EXPORT_SYMBOL(ipv6_chk_prefix);
1533 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1534 struct net_device *dev, int strict)
1536 struct inet6_ifaddr *ifp, *result = NULL;
1537 unsigned int hash = inet6_addr_hash(addr);
1540 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1541 if (!net_eq(dev_net(ifp->idev->dev), net))
1543 if (ipv6_addr_equal(&ifp->addr, addr)) {
1544 if (dev == NULL || ifp->idev->dev == dev ||
1545 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1552 rcu_read_unlock_bh();
1557 /* Gets referenced address, destroys ifaddr */
1559 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1561 if (ifp->flags&IFA_F_PERMANENT) {
1562 spin_lock_bh(&ifp->lock);
1563 addrconf_del_dad_timer(ifp);
1564 ifp->flags |= IFA_F_TENTATIVE;
1566 ifp->flags |= IFA_F_DADFAILED;
1567 spin_unlock_bh(&ifp->lock);
1569 ipv6_ifa_notify(0, ifp);
1571 } else if (ifp->flags&IFA_F_TEMPORARY) {
1572 struct inet6_ifaddr *ifpub;
1573 spin_lock_bh(&ifp->lock);
1576 in6_ifa_hold(ifpub);
1577 spin_unlock_bh(&ifp->lock);
1578 ipv6_create_tempaddr(ifpub, ifp);
1581 spin_unlock_bh(&ifp->lock);
1588 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1592 spin_lock(&ifp->state_lock);
1593 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1594 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1597 spin_unlock(&ifp->state_lock);
1602 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1604 struct inet6_dev *idev = ifp->idev;
1606 if (addrconf_dad_end(ifp)) {
1611 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1612 ifp->idev->dev->name, &ifp->addr);
1614 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1615 struct in6_addr addr;
1617 addr.s6_addr32[0] = htonl(0xfe800000);
1618 addr.s6_addr32[1] = 0;
1620 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1621 ipv6_addr_equal(&ifp->addr, &addr)) {
1622 /* DAD failed for link-local based on MAC address */
1623 idev->cnf.disable_ipv6 = 1;
1625 pr_info("%s: IPv6 being disabled!\n",
1626 ifp->idev->dev->name);
1630 addrconf_dad_stop(ifp, 1);
1633 /* Join to solicited addr multicast group. */
1635 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1637 struct in6_addr maddr;
1639 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1642 addrconf_addr_solict_mult(addr, &maddr);
1643 ipv6_dev_mc_inc(dev, &maddr);
1646 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1648 struct in6_addr maddr;
1650 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1653 addrconf_addr_solict_mult(addr, &maddr);
1654 __ipv6_dev_mc_dec(idev, &maddr);
1657 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1659 struct in6_addr addr;
1660 if (ifp->prefix_len == 127) /* RFC 6164 */
1662 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1663 if (ipv6_addr_any(&addr))
1665 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1668 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1670 struct in6_addr addr;
1671 if (ifp->prefix_len == 127) /* RFC 6164 */
1673 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1674 if (ipv6_addr_any(&addr))
1676 __ipv6_dev_ac_dec(ifp->idev, &addr);
1679 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1681 if (dev->addr_len != ETH_ALEN)
1683 memcpy(eui, dev->dev_addr, 3);
1684 memcpy(eui + 5, dev->dev_addr + 3, 3);
1687 * The zSeries OSA network cards can be shared among various
1688 * OS instances, but the OSA cards have only one MAC address.
1689 * This leads to duplicate address conflicts in conjunction
1690 * with IPv6 if more than one instance uses the same card.
1692 * The driver for these cards can deliver a unique 16-bit
1693 * identifier for each instance sharing the same card. It is
1694 * placed instead of 0xFFFE in the interface identifier. The
1695 * "u" bit of the interface identifier is not inverted in this
1696 * case. Hence the resulting interface identifier has local
1697 * scope according to RFC2373.
1700 eui[3] = (dev->dev_id >> 8) & 0xFF;
1701 eui[4] = dev->dev_id & 0xFF;
1710 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1712 if (dev->addr_len != IEEE802154_ADDR_LEN)
1714 memcpy(eui, dev->dev_addr, 8);
1719 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1721 union fwnet_hwaddr *ha;
1723 if (dev->addr_len != FWNET_ALEN)
1726 ha = (union fwnet_hwaddr *)dev->dev_addr;
1728 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1733 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1735 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1736 if (dev->addr_len != ARCNET_ALEN)
1739 eui[7] = *(u8 *)dev->dev_addr;
1743 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1745 if (dev->addr_len != INFINIBAND_ALEN)
1747 memcpy(eui, dev->dev_addr + 12, 8);
1752 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1756 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1757 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1758 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1759 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1760 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1761 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1765 memcpy(eui + 4, &addr, 4);
1769 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1771 if (dev->priv_flags & IFF_ISATAP)
1772 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1776 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1778 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1781 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
1783 memcpy(eui, dev->perm_addr, 3);
1784 memcpy(eui + 5, dev->perm_addr + 3, 3);
1791 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1793 switch (dev->type) {
1796 return addrconf_ifid_eui48(eui, dev);
1798 return addrconf_ifid_arcnet(eui, dev);
1799 case ARPHRD_INFINIBAND:
1800 return addrconf_ifid_infiniband(eui, dev);
1802 return addrconf_ifid_sit(eui, dev);
1804 return addrconf_ifid_gre(eui, dev);
1805 case ARPHRD_IEEE802154:
1806 return addrconf_ifid_eui64(eui, dev);
1807 case ARPHRD_IEEE1394:
1808 return addrconf_ifid_ieee1394(eui, dev);
1809 case ARPHRD_TUNNEL6:
1810 return addrconf_ifid_ip6tnl(eui, dev);
1815 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1818 struct inet6_ifaddr *ifp;
1820 read_lock_bh(&idev->lock);
1821 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1822 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1823 memcpy(eui, ifp->addr.s6_addr+8, 8);
1828 read_unlock_bh(&idev->lock);
1832 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1833 static void __ipv6_regen_rndid(struct inet6_dev *idev)
1836 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1837 idev->rndid[0] &= ~0x02;
1840 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1841 * check if generated address is not inappropriate
1843 * - Reserved subnet anycast (RFC 2526)
1844 * 11111101 11....11 1xxxxxxx
1845 * - ISATAP (RFC4214) 6.1
1846 * 00-00-5E-FE-xx-xx-xx-xx
1848 * - XXX: already assigned to an address on the device
1850 if (idev->rndid[0] == 0xfd &&
1851 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1852 (idev->rndid[7]&0x80))
1854 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1855 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1857 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1862 static void ipv6_regen_rndid(unsigned long data)
1864 struct inet6_dev *idev = (struct inet6_dev *) data;
1865 unsigned long expires;
1868 write_lock_bh(&idev->lock);
1873 __ipv6_regen_rndid(idev);
1876 idev->cnf.temp_prefered_lft * HZ -
1877 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1878 idev->cnf.max_desync_factor * HZ;
1879 if (time_before(expires, jiffies)) {
1880 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
1881 __func__, idev->dev->name);
1885 if (!mod_timer(&idev->regen_timer, expires))
1889 write_unlock_bh(&idev->lock);
1890 rcu_read_unlock_bh();
1894 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
1896 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1897 __ipv6_regen_rndid(idev);
1905 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1906 unsigned long expires, u32 flags)
1908 struct fib6_config cfg = {
1909 .fc_table = RT6_TABLE_PREFIX,
1910 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1911 .fc_ifindex = dev->ifindex,
1912 .fc_expires = expires,
1914 .fc_flags = RTF_UP | flags,
1915 .fc_nlinfo.nl_net = dev_net(dev),
1916 .fc_protocol = RTPROT_KERNEL,
1921 /* Prevent useless cloning on PtP SIT.
1922 This thing is done here expecting that the whole
1923 class of non-broadcast devices need not cloning.
1925 #if IS_ENABLED(CONFIG_IPV6_SIT)
1926 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1927 cfg.fc_flags |= RTF_NONEXTHOP;
1930 ip6_route_add(&cfg);
1934 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
1936 const struct net_device *dev,
1937 u32 flags, u32 noflags)
1939 struct fib6_node *fn;
1940 struct rt6_info *rt = NULL;
1941 struct fib6_table *table;
1943 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
1947 read_lock_bh(&table->tb6_lock);
1948 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
1951 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1952 if (rt->dst.dev->ifindex != dev->ifindex)
1954 if ((rt->rt6i_flags & flags) != flags)
1956 if ((rt->rt6i_flags & noflags) != 0)
1962 read_unlock_bh(&table->tb6_lock);
1967 /* Create "default" multicast route to the interface */
1969 static void addrconf_add_mroute(struct net_device *dev)
1971 struct fib6_config cfg = {
1972 .fc_table = RT6_TABLE_LOCAL,
1973 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1974 .fc_ifindex = dev->ifindex,
1977 .fc_nlinfo.nl_net = dev_net(dev),
1980 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1982 ip6_route_add(&cfg);
1985 #if IS_ENABLED(CONFIG_IPV6_SIT)
1986 static void sit_route_add(struct net_device *dev)
1988 struct fib6_config cfg = {
1989 .fc_table = RT6_TABLE_MAIN,
1990 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1991 .fc_ifindex = dev->ifindex,
1993 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1994 .fc_nlinfo.nl_net = dev_net(dev),
1997 /* prefix length - 96 bits "::d.d.d.d" */
1998 ip6_route_add(&cfg);
2002 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2004 struct inet6_dev *idev;
2008 idev = ipv6_find_idev(dev);
2010 return ERR_PTR(-ENOBUFS);
2012 if (idev->cnf.disable_ipv6)
2013 return ERR_PTR(-EACCES);
2015 /* Add default multicast route */
2016 if (!(dev->flags & IFF_LOOPBACK))
2017 addrconf_add_mroute(dev);
2022 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2024 struct prefix_info *pinfo;
2028 struct inet6_dev *in6_dev;
2029 struct net *net = dev_net(dev);
2031 pinfo = (struct prefix_info *) opt;
2033 if (len < sizeof(struct prefix_info)) {
2034 ADBG("addrconf: prefix option too short\n");
2039 * Validation checks ([ADDRCONF], page 19)
2042 addr_type = ipv6_addr_type(&pinfo->prefix);
2044 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2047 valid_lft = ntohl(pinfo->valid);
2048 prefered_lft = ntohl(pinfo->prefered);
2050 if (prefered_lft > valid_lft) {
2051 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2055 in6_dev = in6_dev_get(dev);
2057 if (in6_dev == NULL) {
2058 net_dbg_ratelimited("addrconf: device %s not configured\n",
2064 * Two things going on here:
2065 * 1) Add routes for on-link prefixes
2066 * 2) Configure prefixes with the auto flag set
2069 if (pinfo->onlink) {
2070 struct rt6_info *rt;
2071 unsigned long rt_expires;
2073 /* Avoid arithmetic overflow. Really, we could
2074 * save rt_expires in seconds, likely valid_lft,
2075 * but it would require division in fib gc, that it
2079 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2081 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2083 if (addrconf_finite_timeout(rt_expires))
2086 rt = addrconf_get_prefix_route(&pinfo->prefix,
2089 RTF_ADDRCONF | RTF_PREFIX_RT,
2090 RTF_GATEWAY | RTF_DEFAULT);
2093 /* Autoconf prefix route */
2094 if (valid_lft == 0) {
2097 } else if (addrconf_finite_timeout(rt_expires)) {
2099 rt6_set_expires(rt, jiffies + rt_expires);
2101 rt6_clean_expires(rt);
2103 } else if (valid_lft) {
2104 clock_t expires = 0;
2105 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2106 if (addrconf_finite_timeout(rt_expires)) {
2108 flags |= RTF_EXPIRES;
2109 expires = jiffies_to_clock_t(rt_expires);
2111 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2112 dev, expires, flags);
2117 /* Try to figure out our local address for this prefix */
2119 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2120 struct inet6_ifaddr *ifp;
2121 struct in6_addr addr;
2122 int create = 0, update_lft = 0;
2123 bool tokenized = false;
2125 if (pinfo->prefix_len == 64) {
2126 memcpy(&addr, &pinfo->prefix, 8);
2128 if (!ipv6_addr_any(&in6_dev->token)) {
2129 read_lock_bh(&in6_dev->lock);
2130 memcpy(addr.s6_addr + 8,
2131 in6_dev->token.s6_addr + 8, 8);
2132 read_unlock_bh(&in6_dev->lock);
2134 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2135 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2136 in6_dev_put(in6_dev);
2141 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2143 in6_dev_put(in6_dev);
2148 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
2150 if (ifp == NULL && valid_lft) {
2151 int max_addresses = in6_dev->cnf.max_addresses;
2154 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2155 if (in6_dev->cnf.optimistic_dad &&
2156 !net->ipv6.devconf_all->forwarding && sllao)
2157 addr_flags = IFA_F_OPTIMISTIC;
2160 /* Do not allow to create too much of autoconfigured
2161 * addresses; this would be too easy way to crash kernel.
2163 if (!max_addresses ||
2164 ipv6_count_addresses(in6_dev) < max_addresses)
2165 ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2167 addr_type&IPV6_ADDR_SCOPE_MASK,
2168 addr_flags, valid_lft,
2171 if (IS_ERR_OR_NULL(ifp)) {
2172 in6_dev_put(in6_dev);
2178 ifp->cstamp = jiffies;
2179 ifp->tokenized = tokenized;
2180 addrconf_dad_start(ifp);
2186 struct inet6_ifaddr *ift;
2189 /* update lifetime (RFC2462 5.5.3 e) */
2190 spin_lock(&ifp->lock);
2192 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2193 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2196 if (!update_lft && !create && stored_lft) {
2197 const u32 minimum_lft = min(
2198 stored_lft, (u32)MIN_VALID_LIFETIME);
2199 valid_lft = max(valid_lft, minimum_lft);
2201 /* RFC4862 Section 5.5.3e:
2202 * "Note that the preferred lifetime of the
2203 * corresponding address is always reset to
2204 * the Preferred Lifetime in the received
2205 * Prefix Information option, regardless of
2206 * whether the valid lifetime is also reset or
2209 * So we should always update prefered_lft here.
2215 ifp->valid_lft = valid_lft;
2216 ifp->prefered_lft = prefered_lft;
2219 ifp->flags &= ~IFA_F_DEPRECATED;
2220 spin_unlock(&ifp->lock);
2222 if (!(flags&IFA_F_TENTATIVE))
2223 ipv6_ifa_notify(0, ifp);
2225 spin_unlock(&ifp->lock);
2227 read_lock_bh(&in6_dev->lock);
2228 /* update all temporary addresses in the list */
2229 list_for_each_entry(ift, &in6_dev->tempaddr_list,
2231 int age, max_valid, max_prefered;
2233 if (ifp != ift->ifpub)
2237 * RFC 4941 section 3.3:
2238 * If a received option will extend the lifetime
2239 * of a public address, the lifetimes of
2240 * temporary addresses should be extended,
2241 * subject to the overall constraint that no
2242 * temporary addresses should ever remain
2243 * "valid" or "preferred" for a time longer than
2244 * (TEMP_VALID_LIFETIME) or
2245 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR),
2248 age = (now - ift->cstamp) / HZ;
2249 max_valid = in6_dev->cnf.temp_valid_lft - age;
2253 max_prefered = in6_dev->cnf.temp_prefered_lft -
2254 in6_dev->cnf.max_desync_factor -
2256 if (max_prefered < 0)
2259 if (valid_lft > max_valid)
2260 valid_lft = max_valid;
2262 if (prefered_lft > max_prefered)
2263 prefered_lft = max_prefered;
2265 spin_lock(&ift->lock);
2267 ift->valid_lft = valid_lft;
2268 ift->prefered_lft = prefered_lft;
2270 if (prefered_lft > 0)
2271 ift->flags &= ~IFA_F_DEPRECATED;
2273 spin_unlock(&ift->lock);
2274 if (!(flags&IFA_F_TENTATIVE))
2275 ipv6_ifa_notify(0, ift);
2278 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
2280 * When a new public address is created as
2281 * described in [ADDRCONF], also create a new
2282 * temporary address. Also create a temporary
2283 * address if it's enabled but no temporary
2284 * address currently exists.
2286 read_unlock_bh(&in6_dev->lock);
2287 ipv6_create_tempaddr(ifp, NULL);
2289 read_unlock_bh(&in6_dev->lock);
2296 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2297 in6_dev_put(in6_dev);
2301 * Set destination address.
2302 * Special case for SIT interfaces where we create a new "virtual"
2305 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2307 struct in6_ifreq ireq;
2308 struct net_device *dev;
2314 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2317 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2323 #if IS_ENABLED(CONFIG_IPV6_SIT)
2324 if (dev->type == ARPHRD_SIT) {
2325 const struct net_device_ops *ops = dev->netdev_ops;
2327 struct ip_tunnel_parm p;
2329 err = -EADDRNOTAVAIL;
2330 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2333 memset(&p, 0, sizeof(p));
2334 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2338 p.iph.protocol = IPPROTO_IPV6;
2340 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2342 if (ops->ndo_do_ioctl) {
2343 mm_segment_t oldfs = get_fs();
2346 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2353 dev = __dev_get_by_name(net, p.name);
2356 err = dev_open(dev);
2367 * Manual configuration of address on an interface
2369 static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx,
2370 const struct in6_addr *peer_pfx,
2371 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2374 struct inet6_ifaddr *ifp;
2375 struct inet6_dev *idev;
2376 struct net_device *dev;
2380 unsigned long timeout;
2387 /* check the lifetime */
2388 if (!valid_lft || prefered_lft > valid_lft)
2391 dev = __dev_get_by_index(net, ifindex);
2395 idev = addrconf_add_dev(dev);
2397 return PTR_ERR(idev);
2399 scope = ipv6_addr_scope(pfx);
2401 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2402 if (addrconf_finite_timeout(timeout)) {
2403 expires = jiffies_to_clock_t(timeout * HZ);
2404 valid_lft = timeout;
2405 flags = RTF_EXPIRES;
2409 ifa_flags |= IFA_F_PERMANENT;
2412 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2413 if (addrconf_finite_timeout(timeout)) {
2415 ifa_flags |= IFA_F_DEPRECATED;
2416 prefered_lft = timeout;
2419 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2420 valid_lft, prefered_lft);
2423 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2426 * Note that section 3.1 of RFC 4429 indicates
2427 * that the Optimistic flag should not be set for
2428 * manually configured addresses
2430 addrconf_dad_start(ifp);
2436 return PTR_ERR(ifp);
2439 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
2442 struct inet6_ifaddr *ifp;
2443 struct inet6_dev *idev;
2444 struct net_device *dev;
2449 dev = __dev_get_by_index(net, ifindex);
2453 if ((idev = __in6_dev_get(dev)) == NULL)
2456 read_lock_bh(&idev->lock);
2457 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2458 if (ifp->prefix_len == plen &&
2459 ipv6_addr_equal(pfx, &ifp->addr)) {
2461 read_unlock_bh(&idev->lock);
2467 read_unlock_bh(&idev->lock);
2468 return -EADDRNOTAVAIL;
2472 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2474 struct in6_ifreq ireq;
2477 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2480 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2484 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2485 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2486 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2491 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2493 struct in6_ifreq ireq;
2496 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2499 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2503 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2504 ireq.ifr6_prefixlen);
2509 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2510 int plen, int scope)
2512 struct inet6_ifaddr *ifp;
2514 ifp = ipv6_add_addr(idev, addr, NULL, plen,
2515 scope, IFA_F_PERMANENT, 0, 0);
2517 spin_lock_bh(&ifp->lock);
2518 ifp->flags &= ~IFA_F_TENTATIVE;
2519 spin_unlock_bh(&ifp->lock);
2520 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2525 #if IS_ENABLED(CONFIG_IPV6_SIT)
2526 static void sit_add_v4_addrs(struct inet6_dev *idev)
2528 struct in6_addr addr;
2529 struct net_device *dev;
2530 struct net *net = dev_net(idev->dev);
2535 memset(&addr, 0, sizeof(struct in6_addr));
2536 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2538 if (idev->dev->flags&IFF_POINTOPOINT) {
2539 addr.s6_addr32[0] = htonl(0xfe800000);
2542 scope = IPV6_ADDR_COMPATv4;
2545 if (addr.s6_addr32[3]) {
2546 add_addr(idev, &addr, 128, scope);
2550 for_each_netdev(net, dev) {
2551 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2552 if (in_dev && (dev->flags & IFF_UP)) {
2553 struct in_ifaddr *ifa;
2557 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2560 addr.s6_addr32[3] = ifa->ifa_local;
2562 if (ifa->ifa_scope == RT_SCOPE_LINK)
2564 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2565 if (idev->dev->flags&IFF_POINTOPOINT)
2569 if (idev->dev->flags&IFF_POINTOPOINT)
2574 add_addr(idev, &addr, plen, flag);
2581 static void init_loopback(struct net_device *dev)
2583 struct inet6_dev *idev;
2584 struct net_device *sp_dev;
2585 struct inet6_ifaddr *sp_ifa;
2586 struct rt6_info *sp_rt;
2592 if ((idev = ipv6_find_idev(dev)) == NULL) {
2593 pr_debug("%s: add_dev failed\n", __func__);
2597 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2599 /* Add routes to other interface's IPv6 addresses */
2600 for_each_netdev(dev_net(dev), sp_dev) {
2601 if (!strcmp(sp_dev->name, dev->name))
2604 idev = __in6_dev_get(sp_dev);
2608 read_lock_bh(&idev->lock);
2609 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2611 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2617 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, 0);
2619 /* Failure cases are ignored */
2620 if (!IS_ERR(sp_rt)) {
2625 read_unlock_bh(&idev->lock);
2629 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
2631 struct inet6_ifaddr *ifp;
2632 u32 addr_flags = IFA_F_PERMANENT;
2634 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2635 if (idev->cnf.optimistic_dad &&
2636 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2637 addr_flags |= IFA_F_OPTIMISTIC;
2641 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags, 0, 0);
2643 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2644 addrconf_dad_start(ifp);
2649 static void addrconf_dev_config(struct net_device *dev)
2651 struct in6_addr addr;
2652 struct inet6_dev *idev;
2656 if ((dev->type != ARPHRD_ETHER) &&
2657 (dev->type != ARPHRD_FDDI) &&
2658 (dev->type != ARPHRD_ARCNET) &&
2659 (dev->type != ARPHRD_INFINIBAND) &&
2660 (dev->type != ARPHRD_IEEE802154) &&
2661 (dev->type != ARPHRD_IEEE1394) &&
2662 (dev->type != ARPHRD_TUNNEL6)) {
2663 /* Alas, we support only Ethernet autoconfiguration. */
2667 idev = addrconf_add_dev(dev);
2671 memset(&addr, 0, sizeof(struct in6_addr));
2672 addr.s6_addr32[0] = htonl(0xFE800000);
2674 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2675 addrconf_add_linklocal(idev, &addr);
2678 #if IS_ENABLED(CONFIG_IPV6_SIT)
2679 static void addrconf_sit_config(struct net_device *dev)
2681 struct inet6_dev *idev;
2686 * Configure the tunnel with one of our IPv4
2687 * addresses... we should configure all of
2688 * our v4 addrs in the tunnel
2691 if ((idev = ipv6_find_idev(dev)) == NULL) {
2692 pr_debug("%s: add_dev failed\n", __func__);
2696 if (dev->priv_flags & IFF_ISATAP) {
2697 struct in6_addr addr;
2699 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2700 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2701 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2702 addrconf_add_linklocal(idev, &addr);
2706 sit_add_v4_addrs(idev);
2708 if (dev->flags&IFF_POINTOPOINT)
2709 addrconf_add_mroute(dev);
2715 #if IS_ENABLED(CONFIG_NET_IPGRE)
2716 static void addrconf_gre_config(struct net_device *dev)
2718 struct inet6_dev *idev;
2719 struct in6_addr addr;
2723 if ((idev = ipv6_find_idev(dev)) == NULL) {
2724 pr_debug("%s: add_dev failed\n", __func__);
2728 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2729 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2731 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2732 addrconf_add_linklocal(idev, &addr);
2737 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2739 struct in6_addr lladdr;
2741 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2742 addrconf_add_linklocal(idev, &lladdr);
2748 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2751 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2752 struct inet6_dev *idev = __in6_dev_get(dev);
2753 int run_pending = 0;
2757 case NETDEV_REGISTER:
2758 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2759 idev = ipv6_add_dev(dev);
2761 return notifier_from_errno(-ENOMEM);
2767 if (dev->flags & IFF_SLAVE)
2770 if (event == NETDEV_UP) {
2771 if (!addrconf_qdisc_ok(dev)) {
2772 /* device is not ready yet. */
2773 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
2778 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2779 idev = ipv6_add_dev(dev);
2782 idev->if_flags |= IF_READY;
2786 if (!addrconf_qdisc_ok(dev)) {
2787 /* device is still not ready. */
2792 if (idev->if_flags & IF_READY)
2793 /* device is already configured. */
2795 idev->if_flags |= IF_READY;
2798 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
2804 switch (dev->type) {
2805 #if IS_ENABLED(CONFIG_IPV6_SIT)
2807 addrconf_sit_config(dev);
2810 #if IS_ENABLED(CONFIG_NET_IPGRE)
2812 addrconf_gre_config(dev);
2815 case ARPHRD_LOOPBACK:
2820 addrconf_dev_config(dev);
2826 addrconf_dad_run(idev);
2829 * If the MTU changed during the interface down,
2830 * when the interface up, the changed MTU must be
2831 * reflected in the idev as well as routers.
2833 if (idev->cnf.mtu6 != dev->mtu &&
2834 dev->mtu >= IPV6_MIN_MTU) {
2835 rt6_mtu_change(dev, dev->mtu);
2836 idev->cnf.mtu6 = dev->mtu;
2838 idev->tstamp = jiffies;
2839 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2842 * If the changed mtu during down is lower than
2843 * IPV6_MIN_MTU stop IPv6 on this interface.
2845 if (dev->mtu < IPV6_MIN_MTU)
2846 addrconf_ifdown(dev, 1);
2850 case NETDEV_CHANGEMTU:
2851 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2852 rt6_mtu_change(dev, dev->mtu);
2853 idev->cnf.mtu6 = dev->mtu;
2857 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2858 idev = ipv6_add_dev(dev);
2864 * MTU falled under IPV6_MIN_MTU.
2865 * Stop IPv6 on this interface.
2869 case NETDEV_UNREGISTER:
2871 * Remove all addresses from this interface.
2873 addrconf_ifdown(dev, event != NETDEV_DOWN);
2876 case NETDEV_CHANGENAME:
2878 snmp6_unregister_dev(idev);
2879 addrconf_sysctl_unregister(idev);
2880 addrconf_sysctl_register(idev);
2881 err = snmp6_register_dev(idev);
2883 return notifier_from_errno(err);
2887 case NETDEV_PRE_TYPE_CHANGE:
2888 case NETDEV_POST_TYPE_CHANGE:
2889 addrconf_type_change(dev, event);
2897 * addrconf module should be notified of a device going up
2899 static struct notifier_block ipv6_dev_notf = {
2900 .notifier_call = addrconf_notify,
2903 static void addrconf_type_change(struct net_device *dev, unsigned long event)
2905 struct inet6_dev *idev;
2908 idev = __in6_dev_get(dev);
2910 if (event == NETDEV_POST_TYPE_CHANGE)
2911 ipv6_mc_remap(idev);
2912 else if (event == NETDEV_PRE_TYPE_CHANGE)
2913 ipv6_mc_unmap(idev);
2916 static int addrconf_ifdown(struct net_device *dev, int how)
2918 struct net *net = dev_net(dev);
2919 struct inet6_dev *idev;
2920 struct inet6_ifaddr *ifa;
2925 rt6_ifdown(net, dev);
2926 neigh_ifdown(&nd_tbl, dev);
2928 idev = __in6_dev_get(dev);
2933 * Step 1: remove reference to ipv6 device from parent device.
2939 /* protected by rtnl_lock */
2940 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
2942 /* Step 1.5: remove snmp6 entry */
2943 snmp6_unregister_dev(idev);
2947 /* Step 2: clear hash table */
2948 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
2949 struct hlist_head *h = &inet6_addr_lst[i];
2951 spin_lock_bh(&addrconf_hash_lock);
2953 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
2954 if (ifa->idev == idev) {
2955 hlist_del_init_rcu(&ifa->addr_lst);
2956 addrconf_del_dad_timer(ifa);
2960 spin_unlock_bh(&addrconf_hash_lock);
2963 write_lock_bh(&idev->lock);
2965 addrconf_del_rs_timer(idev);
2967 /* Step 2: clear flags for stateless addrconf */
2969 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2971 if (how && del_timer(&idev->regen_timer))
2974 /* Step 3: clear tempaddr list */
2975 while (!list_empty(&idev->tempaddr_list)) {
2976 ifa = list_first_entry(&idev->tempaddr_list,
2977 struct inet6_ifaddr, tmp_list);
2978 list_del(&ifa->tmp_list);
2979 write_unlock_bh(&idev->lock);
2980 spin_lock_bh(&ifa->lock);
2983 in6_ifa_put(ifa->ifpub);
2986 spin_unlock_bh(&ifa->lock);
2988 write_lock_bh(&idev->lock);
2991 while (!list_empty(&idev->addr_list)) {
2992 ifa = list_first_entry(&idev->addr_list,
2993 struct inet6_ifaddr, if_list);
2994 addrconf_del_dad_timer(ifa);
2996 list_del(&ifa->if_list);
2998 write_unlock_bh(&idev->lock);
3000 spin_lock_bh(&ifa->state_lock);
3002 ifa->state = INET6_IFADDR_STATE_DEAD;
3003 spin_unlock_bh(&ifa->state_lock);
3005 if (state != INET6_IFADDR_STATE_DEAD) {
3006 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3007 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3011 write_lock_bh(&idev->lock);
3014 write_unlock_bh(&idev->lock);
3016 /* Step 5: Discard multicast list */
3018 ipv6_mc_destroy_dev(idev);
3022 idev->tstamp = jiffies;
3024 /* Last: Shot the device (if unregistered) */
3026 addrconf_sysctl_unregister(idev);
3027 neigh_parms_release(&nd_tbl, idev->nd_parms);
3028 neigh_ifdown(&nd_tbl, dev);
3034 static void addrconf_rs_timer(unsigned long data)
3036 struct inet6_dev *idev = (struct inet6_dev *)data;
3037 struct net_device *dev = idev->dev;
3038 struct in6_addr lladdr;
3040 write_lock(&idev->lock);
3041 if (idev->dead || !(idev->if_flags & IF_READY))
3044 if (!ipv6_accept_ra(idev))
3047 /* Announcement received after solicitation was sent */
3048 if (idev->if_flags & IF_RA_RCVD)
3051 if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
3052 write_unlock(&idev->lock);
3053 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3054 ndisc_send_rs(dev, &lladdr,
3055 &in6addr_linklocal_allrouters);
3059 write_lock(&idev->lock);
3060 /* The wait after the last probe can be shorter */
3061 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3062 idev->cnf.rtr_solicits) ?
3063 idev->cnf.rtr_solicit_delay :
3064 idev->cnf.rtr_solicit_interval);
3067 * Note: we do not support deprecated "all on-link"
3068 * assumption any longer.
3070 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3074 write_unlock(&idev->lock);
3080 * Duplicate Address Detection
3082 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3084 unsigned long rand_num;
3085 struct inet6_dev *idev = ifp->idev;
3087 if (ifp->flags & IFA_F_OPTIMISTIC)
3090 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
3092 ifp->dad_probes = idev->cnf.dad_transmits;
3093 addrconf_mod_dad_timer(ifp, rand_num);
3096 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3098 struct inet6_dev *idev = ifp->idev;
3099 struct net_device *dev = idev->dev;
3101 addrconf_join_solict(dev, &ifp->addr);
3103 net_srandom(ifp->addr.s6_addr32[3]);
3105 read_lock_bh(&idev->lock);
3106 spin_lock(&ifp->lock);
3107 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3110 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3111 idev->cnf.accept_dad < 1 ||
3112 !(ifp->flags&IFA_F_TENTATIVE) ||
3113 ifp->flags & IFA_F_NODAD) {
3114 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3115 spin_unlock(&ifp->lock);
3116 read_unlock_bh(&idev->lock);
3118 addrconf_dad_completed(ifp);
3122 if (!(idev->if_flags & IF_READY)) {
3123 spin_unlock(&ifp->lock);
3124 read_unlock_bh(&idev->lock);
3126 * If the device is not ready:
3127 * - keep it tentative if it is a permanent address.
3128 * - otherwise, kill it.
3131 addrconf_dad_stop(ifp, 0);
3136 * Optimistic nodes can start receiving
3139 if (ifp->flags & IFA_F_OPTIMISTIC)
3140 ip6_ins_rt(ifp->rt);
3142 addrconf_dad_kick(ifp);
3144 spin_unlock(&ifp->lock);
3145 read_unlock_bh(&idev->lock);
3148 static void addrconf_dad_timer(unsigned long data)
3150 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
3151 struct inet6_dev *idev = ifp->idev;
3152 struct in6_addr mcaddr;
3154 if (!ifp->dad_probes && addrconf_dad_end(ifp))
3157 write_lock(&idev->lock);
3158 if (idev->dead || !(idev->if_flags & IF_READY)) {
3159 write_unlock(&idev->lock);
3163 spin_lock(&ifp->lock);
3164 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3165 spin_unlock(&ifp->lock);
3166 write_unlock(&idev->lock);
3170 if (ifp->dad_probes == 0) {
3172 * DAD was successful
3175 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3176 spin_unlock(&ifp->lock);
3177 write_unlock(&idev->lock);
3179 addrconf_dad_completed(ifp);
3185 addrconf_mod_dad_timer(ifp, ifp->idev->nd_parms->retrans_time);
3186 spin_unlock(&ifp->lock);
3187 write_unlock(&idev->lock);
3189 /* send a neighbour solicitation for our addr */
3190 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3191 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
3196 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3198 struct net_device *dev = ifp->idev->dev;
3199 struct in6_addr lladdr;
3200 bool send_rs, send_mld;
3202 addrconf_del_dad_timer(ifp);
3205 * Configure the address for reception. Now it is valid.
3208 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3210 /* If added prefix is link local and we are prepared to process
3211 router advertisements, start sending router solicitations.
3214 read_lock_bh(&ifp->idev->lock);
3215 spin_lock(&ifp->lock);
3216 send_mld = ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL &&
3217 ifp->idev->valid_ll_addr_cnt == 1;
3218 send_rs = send_mld &&
3219 ipv6_accept_ra(ifp->idev) &&
3220 ifp->idev->cnf.rtr_solicits > 0 &&
3221 (dev->flags&IFF_LOOPBACK) == 0;
3222 spin_unlock(&ifp->lock);
3223 read_unlock_bh(&ifp->idev->lock);
3225 /* While dad is in progress mld report's source address is in6_addrany.
3226 * Resend with proper ll now.
3229 ipv6_mc_dad_complete(ifp->idev);
3233 * If a host as already performed a random delay
3234 * [...] as part of DAD [...] there is no need
3235 * to delay again before sending the first RS
3237 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3239 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
3241 write_lock_bh(&ifp->idev->lock);
3242 spin_lock(&ifp->lock);
3243 ifp->idev->rs_probes = 1;
3244 ifp->idev->if_flags |= IF_RS_SENT;
3245 addrconf_mod_rs_timer(ifp->idev,
3246 ifp->idev->cnf.rtr_solicit_interval);
3247 spin_unlock(&ifp->lock);
3248 write_unlock_bh(&ifp->idev->lock);
3252 static void addrconf_dad_run(struct inet6_dev *idev)
3254 struct inet6_ifaddr *ifp;
3256 read_lock_bh(&idev->lock);
3257 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3258 spin_lock(&ifp->lock);
3259 if (ifp->flags & IFA_F_TENTATIVE &&
3260 ifp->state == INET6_IFADDR_STATE_DAD)
3261 addrconf_dad_kick(ifp);
3262 spin_unlock(&ifp->lock);
3264 read_unlock_bh(&idev->lock);
3267 #ifdef CONFIG_PROC_FS
3268 struct if6_iter_state {
3269 struct seq_net_private p;
3274 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3276 struct inet6_ifaddr *ifa = NULL;
3277 struct if6_iter_state *state = seq->private;
3278 struct net *net = seq_file_net(seq);
3281 /* initial bucket if pos is 0 */
3287 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3288 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
3290 if (!net_eq(dev_net(ifa->idev->dev), net))
3292 /* sync with offset */
3293 if (p < state->offset) {
3301 /* prepare for next bucket */
3308 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3309 struct inet6_ifaddr *ifa)
3311 struct if6_iter_state *state = seq->private;
3312 struct net *net = seq_file_net(seq);
3314 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
3315 if (!net_eq(dev_net(ifa->idev->dev), net))
3321 while (++state->bucket < IN6_ADDR_HSIZE) {
3323 hlist_for_each_entry_rcu_bh(ifa,
3324 &inet6_addr_lst[state->bucket], addr_lst) {
3325 if (!net_eq(dev_net(ifa->idev->dev), net))
3335 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3339 return if6_get_first(seq, *pos);
3342 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3344 struct inet6_ifaddr *ifa;
3346 ifa = if6_get_next(seq, v);
3351 static void if6_seq_stop(struct seq_file *seq, void *v)
3354 rcu_read_unlock_bh();
3357 static int if6_seq_show(struct seq_file *seq, void *v)
3359 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3360 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3362 ifp->idev->dev->ifindex,
3366 ifp->idev->dev->name);
3370 static const struct seq_operations if6_seq_ops = {
3371 .start = if6_seq_start,
3372 .next = if6_seq_next,
3373 .show = if6_seq_show,
3374 .stop = if6_seq_stop,
3377 static int if6_seq_open(struct inode *inode, struct file *file)
3379 return seq_open_net(inode, file, &if6_seq_ops,
3380 sizeof(struct if6_iter_state));
3383 static const struct file_operations if6_fops = {
3384 .owner = THIS_MODULE,
3385 .open = if6_seq_open,
3387 .llseek = seq_lseek,
3388 .release = seq_release_net,
3391 static int __net_init if6_proc_net_init(struct net *net)
3393 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
3398 static void __net_exit if6_proc_net_exit(struct net *net)
3400 remove_proc_entry("if_inet6", net->proc_net);
3403 static struct pernet_operations if6_proc_net_ops = {
3404 .init = if6_proc_net_init,
3405 .exit = if6_proc_net_exit,
3408 int __init if6_proc_init(void)
3410 return register_pernet_subsys(&if6_proc_net_ops);
3413 void if6_proc_exit(void)
3415 unregister_pernet_subsys(&if6_proc_net_ops);
3417 #endif /* CONFIG_PROC_FS */
3419 #if IS_ENABLED(CONFIG_IPV6_MIP6)
3420 /* Check if address is a home address configured on any interface. */
3421 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3424 struct inet6_ifaddr *ifp = NULL;
3425 unsigned int hash = inet6_addr_hash(addr);
3428 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
3429 if (!net_eq(dev_net(ifp->idev->dev), net))
3431 if (ipv6_addr_equal(&ifp->addr, addr) &&
3432 (ifp->flags & IFA_F_HOMEADDRESS)) {
3437 rcu_read_unlock_bh();
3443 * Periodic address status verification
3446 static void addrconf_verify(unsigned long foo)
3448 unsigned long now, next, next_sec, next_sched;
3449 struct inet6_ifaddr *ifp;
3453 spin_lock(&addrconf_verify_lock);
3455 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3457 del_timer(&addr_chk_timer);
3459 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3461 hlist_for_each_entry_rcu_bh(ifp,
3462 &inet6_addr_lst[i], addr_lst) {
3465 if (ifp->flags & IFA_F_PERMANENT)
3468 spin_lock(&ifp->lock);
3469 /* We try to batch several events at once. */
3470 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3472 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3473 age >= ifp->valid_lft) {
3474 spin_unlock(&ifp->lock);
3478 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3479 spin_unlock(&ifp->lock);
3481 } else if (age >= ifp->prefered_lft) {
3482 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3485 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3487 ifp->flags |= IFA_F_DEPRECATED;
3490 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3491 next = ifp->tstamp + ifp->valid_lft * HZ;
3493 spin_unlock(&ifp->lock);
3498 ipv6_ifa_notify(0, ifp);
3502 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3503 !(ifp->flags&IFA_F_TENTATIVE)) {
3504 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3505 ifp->idev->cnf.dad_transmits *
3506 ifp->idev->nd_parms->retrans_time / HZ;
3508 if (age >= ifp->prefered_lft - regen_advance) {
3509 struct inet6_ifaddr *ifpub = ifp->ifpub;
3510 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3511 next = ifp->tstamp + ifp->prefered_lft * HZ;
3512 if (!ifp->regen_count && ifpub) {
3515 in6_ifa_hold(ifpub);
3516 spin_unlock(&ifp->lock);
3518 spin_lock(&ifpub->lock);
3519 ifpub->regen_count = 0;
3520 spin_unlock(&ifpub->lock);
3521 ipv6_create_tempaddr(ifpub, ifp);
3526 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3527 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3528 spin_unlock(&ifp->lock);
3530 /* ifp->prefered_lft <= ifp->valid_lft */
3531 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3532 next = ifp->tstamp + ifp->prefered_lft * HZ;
3533 spin_unlock(&ifp->lock);
3538 next_sec = round_jiffies_up(next);
3541 /* If rounded timeout is accurate enough, accept it. */
3542 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3543 next_sched = next_sec;
3545 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3546 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3547 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3549 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3550 now, next, next_sec, next_sched);
3552 addr_chk_timer.expires = next_sched;
3553 add_timer(&addr_chk_timer);
3554 spin_unlock(&addrconf_verify_lock);
3555 rcu_read_unlock_bh();
3558 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
3559 struct in6_addr **peer_pfx)
3561 struct in6_addr *pfx = NULL;
3566 pfx = nla_data(addr);
3569 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3571 pfx = nla_data(local);
3577 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3578 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3579 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3580 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3584 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
3586 struct net *net = sock_net(skb->sk);
3587 struct ifaddrmsg *ifm;
3588 struct nlattr *tb[IFA_MAX+1];
3589 struct in6_addr *pfx, *peer_pfx;
3592 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3596 ifm = nlmsg_data(nlh);
3597 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
3601 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3604 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3605 u32 prefered_lft, u32 valid_lft)
3609 unsigned long timeout;
3611 if (!valid_lft || (prefered_lft > valid_lft))
3614 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3615 if (addrconf_finite_timeout(timeout)) {
3616 expires = jiffies_to_clock_t(timeout * HZ);
3617 valid_lft = timeout;
3618 flags = RTF_EXPIRES;
3622 ifa_flags |= IFA_F_PERMANENT;
3625 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3626 if (addrconf_finite_timeout(timeout)) {
3628 ifa_flags |= IFA_F_DEPRECATED;
3629 prefered_lft = timeout;
3632 spin_lock_bh(&ifp->lock);
3633 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3634 ifp->tstamp = jiffies;
3635 ifp->valid_lft = valid_lft;
3636 ifp->prefered_lft = prefered_lft;
3638 spin_unlock_bh(&ifp->lock);
3639 if (!(ifp->flags&IFA_F_TENTATIVE))
3640 ipv6_ifa_notify(0, ifp);
3642 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3650 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
3652 struct net *net = sock_net(skb->sk);
3653 struct ifaddrmsg *ifm;
3654 struct nlattr *tb[IFA_MAX+1];
3655 struct in6_addr *pfx, *peer_pfx;
3656 struct inet6_ifaddr *ifa;
3657 struct net_device *dev;
3658 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3662 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3666 ifm = nlmsg_data(nlh);
3667 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
3671 if (tb[IFA_CACHEINFO]) {
3672 struct ifa_cacheinfo *ci;
3674 ci = nla_data(tb[IFA_CACHEINFO]);
3675 valid_lft = ci->ifa_valid;
3676 preferred_lft = ci->ifa_prefered;
3678 preferred_lft = INFINITY_LIFE_TIME;
3679 valid_lft = INFINITY_LIFE_TIME;
3682 dev = __dev_get_by_index(net, ifm->ifa_index);
3686 /* We ignore other flags so far. */
3687 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3689 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3692 * It would be best to check for !NLM_F_CREATE here but
3693 * userspace alreay relies on not having to provide this.
3695 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
3696 ifm->ifa_prefixlen, ifa_flags,
3697 preferred_lft, valid_lft);
3700 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3701 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3704 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3711 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3712 u8 scope, int ifindex)
3714 struct ifaddrmsg *ifm;
3716 ifm = nlmsg_data(nlh);
3717 ifm->ifa_family = AF_INET6;
3718 ifm->ifa_prefixlen = prefixlen;
3719 ifm->ifa_flags = flags;
3720 ifm->ifa_scope = scope;
3721 ifm->ifa_index = ifindex;
3724 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3725 unsigned long tstamp, u32 preferred, u32 valid)
3727 struct ifa_cacheinfo ci;
3729 ci.cstamp = cstamp_delta(cstamp);
3730 ci.tstamp = cstamp_delta(tstamp);
3731 ci.ifa_prefered = preferred;
3732 ci.ifa_valid = valid;
3734 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3737 static inline int rt_scope(int ifa_scope)
3739 if (ifa_scope & IFA_HOST)
3740 return RT_SCOPE_HOST;
3741 else if (ifa_scope & IFA_LINK)
3742 return RT_SCOPE_LINK;
3743 else if (ifa_scope & IFA_SITE)
3744 return RT_SCOPE_SITE;
3746 return RT_SCOPE_UNIVERSE;
3749 static inline int inet6_ifaddr_msgsize(void)
3751 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3752 + nla_total_size(16) /* IFA_LOCAL */
3753 + nla_total_size(16) /* IFA_ADDRESS */
3754 + nla_total_size(sizeof(struct ifa_cacheinfo));
3757 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3758 u32 portid, u32 seq, int event, unsigned int flags)
3760 struct nlmsghdr *nlh;
3761 u32 preferred, valid;
3763 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3767 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3768 ifa->idev->dev->ifindex);
3770 if (!(ifa->flags&IFA_F_PERMANENT)) {
3771 preferred = ifa->prefered_lft;
3772 valid = ifa->valid_lft;
3773 if (preferred != INFINITY_LIFE_TIME) {
3774 long tval = (jiffies - ifa->tstamp)/HZ;
3775 if (preferred > tval)
3779 if (valid != INFINITY_LIFE_TIME) {
3787 preferred = INFINITY_LIFE_TIME;
3788 valid = INFINITY_LIFE_TIME;
3791 if (!ipv6_addr_any(&ifa->peer_addr)) {
3792 if (nla_put(skb, IFA_LOCAL, 16, &ifa->addr) < 0 ||
3793 nla_put(skb, IFA_ADDRESS, 16, &ifa->peer_addr) < 0)
3796 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0)
3799 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
3802 return nlmsg_end(skb, nlh);
3805 nlmsg_cancel(skb, nlh);
3809 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3810 u32 portid, u32 seq, int event, u16 flags)
3812 struct nlmsghdr *nlh;
3813 u8 scope = RT_SCOPE_UNIVERSE;
3814 int ifindex = ifmca->idev->dev->ifindex;
3816 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3817 scope = RT_SCOPE_SITE;
3819 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3823 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3824 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3825 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3826 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3827 nlmsg_cancel(skb, nlh);
3831 return nlmsg_end(skb, nlh);
3834 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3835 u32 portid, u32 seq, int event, unsigned int flags)
3837 struct nlmsghdr *nlh;
3838 u8 scope = RT_SCOPE_UNIVERSE;
3839 int ifindex = ifaca->aca_idev->dev->ifindex;
3841 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3842 scope = RT_SCOPE_SITE;
3844 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3848 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3849 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3850 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3851 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3852 nlmsg_cancel(skb, nlh);
3856 return nlmsg_end(skb, nlh);
3865 /* called with rcu_read_lock() */
3866 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3867 struct netlink_callback *cb, enum addr_type_t type,
3868 int s_ip_idx, int *p_ip_idx)
3870 struct ifmcaddr6 *ifmca;
3871 struct ifacaddr6 *ifaca;
3873 int ip_idx = *p_ip_idx;
3875 read_lock_bh(&idev->lock);
3877 case UNICAST_ADDR: {
3878 struct inet6_ifaddr *ifa;
3880 /* unicast address incl. temp addr */
3881 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3882 if (++ip_idx < s_ip_idx)
3884 err = inet6_fill_ifaddr(skb, ifa,
3885 NETLINK_CB(cb->skb).portid,
3891 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3895 case MULTICAST_ADDR:
3896 /* multicast address */
3897 for (ifmca = idev->mc_list; ifmca;
3898 ifmca = ifmca->next, ip_idx++) {
3899 if (ip_idx < s_ip_idx)
3901 err = inet6_fill_ifmcaddr(skb, ifmca,
3902 NETLINK_CB(cb->skb).portid,
3911 /* anycast address */
3912 for (ifaca = idev->ac_list; ifaca;
3913 ifaca = ifaca->aca_next, ip_idx++) {
3914 if (ip_idx < s_ip_idx)
3916 err = inet6_fill_ifacaddr(skb, ifaca,
3917 NETLINK_CB(cb->skb).portid,
3928 read_unlock_bh(&idev->lock);
3933 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3934 enum addr_type_t type)
3936 struct net *net = sock_net(skb->sk);
3939 int s_idx, s_ip_idx;
3940 struct net_device *dev;
3941 struct inet6_dev *idev;
3942 struct hlist_head *head;
3945 s_idx = idx = cb->args[1];
3946 s_ip_idx = ip_idx = cb->args[2];
3949 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
3950 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3952 head = &net->dev_index_head[h];
3953 hlist_for_each_entry_rcu(dev, head, index_hlist) {
3956 if (h > s_h || idx > s_idx)
3959 idev = __in6_dev_get(dev);
3963 if (in6_dump_addrs(idev, skb, cb, type,
3964 s_ip_idx, &ip_idx) <= 0)
3974 cb->args[2] = ip_idx;
3979 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3981 enum addr_type_t type = UNICAST_ADDR;
3983 return inet6_dump_addr(skb, cb, type);
3986 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3988 enum addr_type_t type = MULTICAST_ADDR;
3990 return inet6_dump_addr(skb, cb, type);
3994 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3996 enum addr_type_t type = ANYCAST_ADDR;
3998 return inet6_dump_addr(skb, cb, type);
4001 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
4003 struct net *net = sock_net(in_skb->sk);
4004 struct ifaddrmsg *ifm;
4005 struct nlattr *tb[IFA_MAX+1];
4006 struct in6_addr *addr = NULL, *peer;
4007 struct net_device *dev = NULL;
4008 struct inet6_ifaddr *ifa;
4009 struct sk_buff *skb;
4012 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4016 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4022 ifm = nlmsg_data(nlh);
4024 dev = __dev_get_by_index(net, ifm->ifa_index);
4026 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4028 err = -EADDRNOTAVAIL;
4032 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4038 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4039 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4041 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4042 WARN_ON(err == -EMSGSIZE);
4046 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4053 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4055 struct sk_buff *skb;
4056 struct net *net = dev_net(ifa->idev->dev);
4059 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4063 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4065 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4066 WARN_ON(err == -EMSGSIZE);
4070 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4074 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4077 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4078 __s32 *array, int bytes)
4080 BUG_ON(bytes < (DEVCONF_MAX * 4));
4082 memset(array, 0, bytes);
4083 array[DEVCONF_FORWARDING] = cnf->forwarding;
4084 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4085 array[DEVCONF_MTU6] = cnf->mtu6;
4086 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4087 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4088 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4089 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4090 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4091 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4092 jiffies_to_msecs(cnf->rtr_solicit_interval);
4093 array[DEVCONF_RTR_SOLICIT_DELAY] =
4094 jiffies_to_msecs(cnf->rtr_solicit_delay);
4095 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4096 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4097 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4098 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4099 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
4100 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4101 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4102 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4103 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4104 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4105 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4106 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4107 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4108 #ifdef CONFIG_IPV6_ROUTER_PREF
4109 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4110 array[DEVCONF_RTR_PROBE_INTERVAL] =
4111 jiffies_to_msecs(cnf->rtr_probe_interval);
4112 #ifdef CONFIG_IPV6_ROUTE_INFO
4113 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4116 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4117 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4118 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4119 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4121 #ifdef CONFIG_IPV6_MROUTE
4122 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4124 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4125 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4126 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4127 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4128 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
4131 static inline size_t inet6_ifla6_size(void)
4133 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4134 + nla_total_size(sizeof(struct ifla_cacheinfo))
4135 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4136 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4137 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4138 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
4141 static inline size_t inet6_if_nlmsg_size(void)
4143 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4144 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4145 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4146 + nla_total_size(4) /* IFLA_MTU */
4147 + nla_total_size(4) /* IFLA_LINK */
4148 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4151 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4152 int items, int bytes)
4155 int pad = bytes - sizeof(u64) * items;
4158 /* Use put_unaligned() because stats may not be aligned for u64. */
4159 put_unaligned(items, &stats[0]);
4160 for (i = 1; i < items; i++)
4161 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4163 memset(&stats[items], 0, pad);
4166 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
4167 int items, int bytes, size_t syncpoff)
4170 int pad = bytes - sizeof(u64) * items;
4173 /* Use put_unaligned() because stats may not be aligned for u64. */
4174 put_unaligned(items, &stats[0]);
4175 for (i = 1; i < items; i++)
4176 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4178 memset(&stats[items], 0, pad);
4181 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4185 case IFLA_INET6_STATS:
4186 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
4187 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
4189 case IFLA_INET6_ICMP6STATS:
4190 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
4195 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4198 struct ifla_cacheinfo ci;
4200 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4201 goto nla_put_failure;
4202 ci.max_reasm_len = IPV6_MAXPLEN;
4203 ci.tstamp = cstamp_delta(idev->tstamp);
4204 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4205 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
4206 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4207 goto nla_put_failure;
4208 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4210 goto nla_put_failure;
4211 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4213 /* XXX - MC not implemented */
4215 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4217 goto nla_put_failure;
4218 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4220 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4222 goto nla_put_failure;
4223 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4225 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4227 goto nla_put_failure;
4228 read_lock_bh(&idev->lock);
4229 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4230 read_unlock_bh(&idev->lock);
4238 static size_t inet6_get_link_af_size(const struct net_device *dev)
4240 if (!__in6_dev_get(dev))
4243 return inet6_ifla6_size();
4246 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4248 struct inet6_dev *idev = __in6_dev_get(dev);
4253 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4259 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4261 struct inet6_ifaddr *ifp;
4262 struct net_device *dev = idev->dev;
4263 bool update_rs = false;
4264 struct in6_addr ll_addr;
4268 if (ipv6_addr_any(token))
4270 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4272 if (!ipv6_accept_ra(idev))
4274 if (idev->cnf.rtr_solicits <= 0)
4277 write_lock_bh(&idev->lock);
4279 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4280 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4282 write_unlock_bh(&idev->lock);
4284 if (!idev->dead && (idev->if_flags & IF_READY) &&
4285 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4286 IFA_F_OPTIMISTIC)) {
4288 /* If we're not ready, then normal ifup will take care
4289 * of this. Otherwise, we need to request our rs here.
4291 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4295 write_lock_bh(&idev->lock);
4298 idev->if_flags |= IF_RS_SENT;
4299 idev->rs_probes = 1;
4300 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
4303 /* Well, that's kinda nasty ... */
4304 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4305 spin_lock(&ifp->lock);
4306 if (ifp->tokenized) {
4308 ifp->prefered_lft = 0;
4310 spin_unlock(&ifp->lock);
4313 write_unlock_bh(&idev->lock);
4318 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4321 struct inet6_dev *idev = __in6_dev_get(dev);
4322 struct nlattr *tb[IFLA_INET6_MAX + 1];
4325 return -EAFNOSUPPORT;
4327 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4330 if (tb[IFLA_INET6_TOKEN])
4331 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
4336 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4337 u32 portid, u32 seq, int event, unsigned int flags)
4339 struct net_device *dev = idev->dev;
4340 struct ifinfomsg *hdr;
4341 struct nlmsghdr *nlh;
4344 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
4348 hdr = nlmsg_data(nlh);
4349 hdr->ifi_family = AF_INET6;
4351 hdr->ifi_type = dev->type;
4352 hdr->ifi_index = dev->ifindex;
4353 hdr->ifi_flags = dev_get_flags(dev);
4354 hdr->ifi_change = 0;
4356 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4358 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4359 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4360 (dev->ifindex != dev->iflink &&
4361 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4362 goto nla_put_failure;
4363 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4364 if (protoinfo == NULL)
4365 goto nla_put_failure;
4367 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4368 goto nla_put_failure;
4370 nla_nest_end(skb, protoinfo);
4371 return nlmsg_end(skb, nlh);
4374 nlmsg_cancel(skb, nlh);
4378 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4380 struct net *net = sock_net(skb->sk);
4383 struct net_device *dev;
4384 struct inet6_dev *idev;
4385 struct hlist_head *head;
4388 s_idx = cb->args[1];
4391 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4393 head = &net->dev_index_head[h];
4394 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4397 idev = __in6_dev_get(dev);
4400 if (inet6_fill_ifinfo(skb, idev,
4401 NETLINK_CB(cb->skb).portid,
4403 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4417 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4419 struct sk_buff *skb;
4420 struct net *net = dev_net(idev->dev);
4423 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4427 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4429 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4430 WARN_ON(err == -EMSGSIZE);
4434 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4438 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4441 static inline size_t inet6_prefix_nlmsg_size(void)
4443 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4444 + nla_total_size(sizeof(struct in6_addr))
4445 + nla_total_size(sizeof(struct prefix_cacheinfo));
4448 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4449 struct prefix_info *pinfo, u32 portid, u32 seq,
4450 int event, unsigned int flags)
4452 struct prefixmsg *pmsg;
4453 struct nlmsghdr *nlh;
4454 struct prefix_cacheinfo ci;
4456 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
4460 pmsg = nlmsg_data(nlh);
4461 pmsg->prefix_family = AF_INET6;
4462 pmsg->prefix_pad1 = 0;
4463 pmsg->prefix_pad2 = 0;
4464 pmsg->prefix_ifindex = idev->dev->ifindex;
4465 pmsg->prefix_len = pinfo->prefix_len;
4466 pmsg->prefix_type = pinfo->type;
4467 pmsg->prefix_pad3 = 0;
4468 pmsg->prefix_flags = 0;
4470 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4471 if (pinfo->autoconf)
4472 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4474 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4475 goto nla_put_failure;
4476 ci.preferred_time = ntohl(pinfo->prefered);
4477 ci.valid_time = ntohl(pinfo->valid);
4478 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4479 goto nla_put_failure;
4480 return nlmsg_end(skb, nlh);
4483 nlmsg_cancel(skb, nlh);
4487 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4488 struct prefix_info *pinfo)
4490 struct sk_buff *skb;
4491 struct net *net = dev_net(idev->dev);
4494 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4498 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4500 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4501 WARN_ON(err == -EMSGSIZE);
4505 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4509 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4512 static void update_valid_ll_addr_cnt(struct inet6_ifaddr *ifp, int count)
4514 write_lock_bh(&ifp->idev->lock);
4515 spin_lock(&ifp->lock);
4516 if (((ifp->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|
4517 IFA_F_DADFAILED)) == IFA_F_PERMANENT) &&
4518 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL))
4519 ifp->idev->valid_ll_addr_cnt += count;
4520 WARN_ON(ifp->idev->valid_ll_addr_cnt < 0);
4521 spin_unlock(&ifp->lock);
4522 write_unlock_bh(&ifp->idev->lock);
4525 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4527 struct net *net = dev_net(ifp->idev->dev);
4529 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4533 update_valid_ll_addr_cnt(ifp, 1);
4536 * If the address was optimistic
4537 * we inserted the route at the start of
4538 * our DAD process, so we don't need
4541 if (!(ifp->rt->rt6i_node))
4542 ip6_ins_rt(ifp->rt);
4543 if (ifp->idev->cnf.forwarding)
4544 addrconf_join_anycast(ifp);
4545 if (!ipv6_addr_any(&ifp->peer_addr))
4546 addrconf_prefix_route(&ifp->peer_addr, 128,
4547 ifp->idev->dev, 0, 0);
4550 update_valid_ll_addr_cnt(ifp, -1);
4552 if (ifp->idev->cnf.forwarding)
4553 addrconf_leave_anycast(ifp);
4554 addrconf_leave_solict(ifp->idev, &ifp->addr);
4555 if (!ipv6_addr_any(&ifp->peer_addr)) {
4556 struct rt6_info *rt;
4557 struct net_device *dev = ifp->idev->dev;
4559 rt = rt6_lookup(dev_net(dev), &ifp->peer_addr, NULL,
4567 dst_hold(&ifp->rt->dst);
4569 if (ip6_del_rt(ifp->rt))
4570 dst_free(&ifp->rt->dst);
4573 atomic_inc(&net->ipv6.dev_addr_genid);
4574 rt_genid_bump_ipv6(net);
4577 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4580 if (likely(ifp->idev->dead == 0))
4581 __ipv6_ifa_notify(event, ifp);
4582 rcu_read_unlock_bh();
4585 #ifdef CONFIG_SYSCTL
4588 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
4589 void __user *buffer, size_t *lenp, loff_t *ppos)
4591 int *valp = ctl->data;
4594 struct ctl_table lctl;
4598 * ctl->data points to idev->cnf.forwarding, we should
4599 * not modify it until we get the rtnl lock.
4604 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4607 ret = addrconf_fixup_forwarding(ctl, valp, val);
4613 static void dev_disable_change(struct inet6_dev *idev)
4615 struct netdev_notifier_info info;
4617 if (!idev || !idev->dev)
4620 netdev_notifier_info_init(&info, idev->dev);
4621 if (idev->cnf.disable_ipv6)
4622 addrconf_notify(NULL, NETDEV_DOWN, &info);
4624 addrconf_notify(NULL, NETDEV_UP, &info);
4627 static void addrconf_disable_change(struct net *net, __s32 newf)
4629 struct net_device *dev;
4630 struct inet6_dev *idev;
4633 for_each_netdev_rcu(net, dev) {
4634 idev = __in6_dev_get(dev);
4636 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4637 idev->cnf.disable_ipv6 = newf;
4639 dev_disable_change(idev);
4645 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
4650 if (!rtnl_trylock())
4651 return restart_syscall();
4653 net = (struct net *)table->extra2;
4657 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4662 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4663 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4664 addrconf_disable_change(net, newf);
4665 } else if ((!newf) ^ (!old))
4666 dev_disable_change((struct inet6_dev *)table->extra1);
4673 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
4674 void __user *buffer, size_t *lenp, loff_t *ppos)
4676 int *valp = ctl->data;
4679 struct ctl_table lctl;
4683 * ctl->data points to idev->cnf.disable_ipv6, we should
4684 * not modify it until we get the rtnl lock.
4689 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4692 ret = addrconf_disable_ipv6(ctl, valp, val);
4698 static struct addrconf_sysctl_table
4700 struct ctl_table_header *sysctl_header;
4701 struct ctl_table addrconf_vars[DEVCONF_MAX+1];
4702 } addrconf_sysctl __read_mostly = {
4703 .sysctl_header = NULL,
4706 .procname = "forwarding",
4707 .data = &ipv6_devconf.forwarding,
4708 .maxlen = sizeof(int),
4710 .proc_handler = addrconf_sysctl_forward,
4713 .procname = "hop_limit",
4714 .data = &ipv6_devconf.hop_limit,
4715 .maxlen = sizeof(int),
4717 .proc_handler = proc_dointvec,
4721 .data = &ipv6_devconf.mtu6,
4722 .maxlen = sizeof(int),
4724 .proc_handler = proc_dointvec,
4727 .procname = "accept_ra",
4728 .data = &ipv6_devconf.accept_ra,
4729 .maxlen = sizeof(int),
4731 .proc_handler = proc_dointvec,
4734 .procname = "accept_redirects",
4735 .data = &ipv6_devconf.accept_redirects,
4736 .maxlen = sizeof(int),
4738 .proc_handler = proc_dointvec,
4741 .procname = "autoconf",
4742 .data = &ipv6_devconf.autoconf,
4743 .maxlen = sizeof(int),
4745 .proc_handler = proc_dointvec,
4748 .procname = "dad_transmits",
4749 .data = &ipv6_devconf.dad_transmits,
4750 .maxlen = sizeof(int),
4752 .proc_handler = proc_dointvec,
4755 .procname = "router_solicitations",
4756 .data = &ipv6_devconf.rtr_solicits,
4757 .maxlen = sizeof(int),
4759 .proc_handler = proc_dointvec,
4762 .procname = "router_solicitation_interval",
4763 .data = &ipv6_devconf.rtr_solicit_interval,
4764 .maxlen = sizeof(int),
4766 .proc_handler = proc_dointvec_jiffies,
4769 .procname = "router_solicitation_delay",
4770 .data = &ipv6_devconf.rtr_solicit_delay,
4771 .maxlen = sizeof(int),
4773 .proc_handler = proc_dointvec_jiffies,
4776 .procname = "force_mld_version",
4777 .data = &ipv6_devconf.force_mld_version,
4778 .maxlen = sizeof(int),
4780 .proc_handler = proc_dointvec,
4783 .procname = "mldv1_unsolicited_report_interval",
4785 &ipv6_devconf.mldv1_unsolicited_report_interval,
4786 .maxlen = sizeof(int),
4788 .proc_handler = proc_dointvec_ms_jiffies,
4791 .procname = "mldv2_unsolicited_report_interval",
4793 &ipv6_devconf.mldv2_unsolicited_report_interval,
4794 .maxlen = sizeof(int),
4796 .proc_handler = proc_dointvec_ms_jiffies,
4799 .procname = "use_tempaddr",
4800 .data = &ipv6_devconf.use_tempaddr,
4801 .maxlen = sizeof(int),
4803 .proc_handler = proc_dointvec,
4806 .procname = "temp_valid_lft",
4807 .data = &ipv6_devconf.temp_valid_lft,
4808 .maxlen = sizeof(int),
4810 .proc_handler = proc_dointvec,
4813 .procname = "temp_prefered_lft",
4814 .data = &ipv6_devconf.temp_prefered_lft,
4815 .maxlen = sizeof(int),
4817 .proc_handler = proc_dointvec,
4820 .procname = "regen_max_retry",
4821 .data = &ipv6_devconf.regen_max_retry,
4822 .maxlen = sizeof(int),
4824 .proc_handler = proc_dointvec,
4827 .procname = "max_desync_factor",
4828 .data = &ipv6_devconf.max_desync_factor,
4829 .maxlen = sizeof(int),
4831 .proc_handler = proc_dointvec,
4834 .procname = "max_addresses",
4835 .data = &ipv6_devconf.max_addresses,
4836 .maxlen = sizeof(int),
4838 .proc_handler = proc_dointvec,
4841 .procname = "accept_ra_defrtr",
4842 .data = &ipv6_devconf.accept_ra_defrtr,
4843 .maxlen = sizeof(int),
4845 .proc_handler = proc_dointvec,
4848 .procname = "accept_ra_pinfo",
4849 .data = &ipv6_devconf.accept_ra_pinfo,
4850 .maxlen = sizeof(int),
4852 .proc_handler = proc_dointvec,
4854 #ifdef CONFIG_IPV6_ROUTER_PREF
4856 .procname = "accept_ra_rtr_pref",
4857 .data = &ipv6_devconf.accept_ra_rtr_pref,
4858 .maxlen = sizeof(int),
4860 .proc_handler = proc_dointvec,
4863 .procname = "router_probe_interval",
4864 .data = &ipv6_devconf.rtr_probe_interval,
4865 .maxlen = sizeof(int),
4867 .proc_handler = proc_dointvec_jiffies,
4869 #ifdef CONFIG_IPV6_ROUTE_INFO
4871 .procname = "accept_ra_rt_info_max_plen",
4872 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4873 .maxlen = sizeof(int),
4875 .proc_handler = proc_dointvec,
4880 .procname = "proxy_ndp",
4881 .data = &ipv6_devconf.proxy_ndp,
4882 .maxlen = sizeof(int),
4884 .proc_handler = proc_dointvec,
4887 .procname = "accept_source_route",
4888 .data = &ipv6_devconf.accept_source_route,
4889 .maxlen = sizeof(int),
4891 .proc_handler = proc_dointvec,
4893 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4895 .procname = "optimistic_dad",
4896 .data = &ipv6_devconf.optimistic_dad,
4897 .maxlen = sizeof(int),
4899 .proc_handler = proc_dointvec,
4903 #ifdef CONFIG_IPV6_MROUTE
4905 .procname = "mc_forwarding",
4906 .data = &ipv6_devconf.mc_forwarding,
4907 .maxlen = sizeof(int),
4909 .proc_handler = proc_dointvec,
4913 .procname = "disable_ipv6",
4914 .data = &ipv6_devconf.disable_ipv6,
4915 .maxlen = sizeof(int),
4917 .proc_handler = addrconf_sysctl_disable,
4920 .procname = "accept_dad",
4921 .data = &ipv6_devconf.accept_dad,
4922 .maxlen = sizeof(int),
4924 .proc_handler = proc_dointvec,
4927 .procname = "force_tllao",
4928 .data = &ipv6_devconf.force_tllao,
4929 .maxlen = sizeof(int),
4931 .proc_handler = proc_dointvec
4934 .procname = "ndisc_notify",
4935 .data = &ipv6_devconf.ndisc_notify,
4936 .maxlen = sizeof(int),
4938 .proc_handler = proc_dointvec
4941 .procname = "suppress_frag_ndisc",
4942 .data = &ipv6_devconf.suppress_frag_ndisc,
4943 .maxlen = sizeof(int),
4945 .proc_handler = proc_dointvec
4953 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4954 struct inet6_dev *idev, struct ipv6_devconf *p)
4957 struct addrconf_sysctl_table *t;
4958 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
4960 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4964 for (i = 0; t->addrconf_vars[i].data; i++) {
4965 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
4966 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4967 t->addrconf_vars[i].extra2 = net;
4970 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
4972 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
4973 if (t->sysctl_header == NULL)
4985 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4987 struct addrconf_sysctl_table *t;
4989 if (p->sysctl == NULL)
4994 unregister_net_sysctl_table(t->sysctl_header);
4998 static void addrconf_sysctl_register(struct inet6_dev *idev)
5000 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
5001 &ndisc_ifinfo_sysctl_change);
5002 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
5006 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
5008 __addrconf_sysctl_unregister(&idev->cnf);
5009 neigh_sysctl_unregister(idev->nd_parms);
5015 static int __net_init addrconf_init_net(struct net *net)
5018 struct ipv6_devconf *all, *dflt;
5020 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
5024 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
5026 goto err_alloc_dflt;
5028 /* these will be inherited by all namespaces */
5029 dflt->autoconf = ipv6_defaults.autoconf;
5030 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
5032 net->ipv6.devconf_all = all;
5033 net->ipv6.devconf_dflt = dflt;
5035 #ifdef CONFIG_SYSCTL
5036 err = __addrconf_sysctl_register(net, "all", NULL, all);
5040 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
5046 #ifdef CONFIG_SYSCTL
5048 __addrconf_sysctl_unregister(all);
5058 static void __net_exit addrconf_exit_net(struct net *net)
5060 #ifdef CONFIG_SYSCTL
5061 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5062 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5064 if (!net_eq(net, &init_net)) {
5065 kfree(net->ipv6.devconf_dflt);
5066 kfree(net->ipv6.devconf_all);
5070 static struct pernet_operations addrconf_ops = {
5071 .init = addrconf_init_net,
5072 .exit = addrconf_exit_net,
5075 static struct rtnl_af_ops inet6_ops = {
5077 .fill_link_af = inet6_fill_link_af,
5078 .get_link_af_size = inet6_get_link_af_size,
5079 .set_link_af = inet6_set_link_af,
5083 * Init / cleanup code
5086 int __init addrconf_init(void)
5090 err = ipv6_addr_label_init();
5092 pr_crit("%s: cannot initialize default policy table: %d\n",
5097 err = register_pernet_subsys(&addrconf_ops);
5101 /* The addrconf netdev notifier requires that loopback_dev
5102 * has it's ipv6 private information allocated and setup
5103 * before it can bring up and give link-local addresses
5104 * to other devices which are up.
5106 * Unfortunately, loopback_dev is not necessarily the first
5107 * entry in the global dev_base list of net devices. In fact,
5108 * it is likely to be the very last entry on that list.
5109 * So this causes the notifier registry below to try and
5110 * give link-local addresses to all devices besides loopback_dev
5111 * first, then loopback_dev, which cases all the non-loopback_dev
5112 * devices to fail to get a link-local address.
5114 * So, as a temporary fix, allocate the ipv6 structure for
5115 * loopback_dev first by hand.
5116 * Longer term, all of the dependencies ipv6 has upon the loopback
5117 * device and it being up should be removed.
5120 if (!ipv6_add_dev(init_net.loopback_dev))
5126 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5127 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5129 register_netdevice_notifier(&ipv6_dev_notf);
5133 err = rtnl_af_register(&inet6_ops);
5137 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5142 /* Only the first call to __rtnl_register can fail */
5143 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5144 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5145 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5146 inet6_dump_ifaddr, NULL);
5147 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5148 inet6_dump_ifmcaddr, NULL);
5149 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5150 inet6_dump_ifacaddr, NULL);
5151 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
5152 inet6_netconf_dump_devconf, NULL);
5154 ipv6_addr_label_rtnl_register();
5158 rtnl_af_unregister(&inet6_ops);
5160 unregister_netdevice_notifier(&ipv6_dev_notf);
5162 unregister_pernet_subsys(&addrconf_ops);
5164 ipv6_addr_label_cleanup();
5169 void addrconf_cleanup(void)
5171 struct net_device *dev;
5174 unregister_netdevice_notifier(&ipv6_dev_notf);
5175 unregister_pernet_subsys(&addrconf_ops);
5176 ipv6_addr_label_cleanup();
5180 __rtnl_af_unregister(&inet6_ops);
5182 /* clean dev list */
5183 for_each_netdev(&init_net, dev) {
5184 if (__in6_dev_get(dev) == NULL)
5186 addrconf_ifdown(dev, 1);
5188 addrconf_ifdown(init_net.loopback_dev, 2);
5193 spin_lock_bh(&addrconf_hash_lock);
5194 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5195 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5196 spin_unlock_bh(&addrconf_hash_lock);
5198 del_timer(&addr_chk_timer);