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(void);
137 static void addrconf_verify_rtnl(void);
138 static void addrconf_verify_work(struct work_struct *);
140 static struct workqueue_struct *addrconf_wq;
141 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
143 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
144 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
146 static void addrconf_type_change(struct net_device *dev,
147 unsigned long event);
148 static int addrconf_ifdown(struct net_device *dev, int how);
150 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
152 const struct net_device *dev,
153 u32 flags, u32 noflags);
155 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
156 static void addrconf_dad_work(struct work_struct *w);
157 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
158 static void addrconf_dad_run(struct inet6_dev *idev);
159 static void addrconf_rs_timer(unsigned long data);
160 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
161 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
163 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
164 struct prefix_info *pinfo);
165 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
166 struct net_device *dev);
168 static struct ipv6_devconf ipv6_devconf __read_mostly = {
170 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
171 .mtu6 = IPV6_MIN_MTU,
173 .accept_redirects = 1,
175 .force_mld_version = 0,
176 .mldv1_unsolicited_report_interval = 10 * HZ,
177 .mldv2_unsolicited_report_interval = HZ,
179 .rtr_solicits = MAX_RTR_SOLICITATIONS,
180 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
181 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
183 .temp_valid_lft = TEMP_VALID_LIFETIME,
184 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
185 .regen_max_retry = REGEN_MAX_RETRY,
186 .max_desync_factor = MAX_DESYNC_FACTOR,
187 .max_addresses = IPV6_MAX_ADDRESSES,
188 .accept_ra_defrtr = 1,
189 .accept_ra_from_local = 0,
190 .accept_ra_pinfo = 1,
191 #ifdef CONFIG_IPV6_ROUTER_PREF
192 .accept_ra_rtr_pref = 1,
193 .rtr_probe_interval = 60 * HZ,
194 #ifdef CONFIG_IPV6_ROUTE_INFO
195 .accept_ra_rt_info_max_plen = 0,
199 .accept_source_route = 0, /* we do not accept RH0 by default. */
202 .suppress_frag_ndisc = 1,
205 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
207 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
208 .mtu6 = IPV6_MIN_MTU,
210 .accept_redirects = 1,
212 .force_mld_version = 0,
213 .mldv1_unsolicited_report_interval = 10 * HZ,
214 .mldv2_unsolicited_report_interval = HZ,
216 .rtr_solicits = MAX_RTR_SOLICITATIONS,
217 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
218 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
220 .temp_valid_lft = TEMP_VALID_LIFETIME,
221 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
222 .regen_max_retry = REGEN_MAX_RETRY,
223 .max_desync_factor = MAX_DESYNC_FACTOR,
224 .max_addresses = IPV6_MAX_ADDRESSES,
225 .accept_ra_defrtr = 1,
226 .accept_ra_from_local = 0,
227 .accept_ra_pinfo = 1,
228 #ifdef CONFIG_IPV6_ROUTER_PREF
229 .accept_ra_rtr_pref = 1,
230 .rtr_probe_interval = 60 * HZ,
231 #ifdef CONFIG_IPV6_ROUTE_INFO
232 .accept_ra_rt_info_max_plen = 0,
236 .accept_source_route = 0, /* we do not accept RH0 by default. */
239 .suppress_frag_ndisc = 1,
242 /* Check if a valid qdisc is available */
243 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
245 return !qdisc_tx_is_noop(dev);
248 static void addrconf_del_rs_timer(struct inet6_dev *idev)
250 if (del_timer(&idev->rs_timer))
254 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
256 if (cancel_delayed_work(&ifp->dad_work))
260 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
263 if (!timer_pending(&idev->rs_timer))
265 mod_timer(&idev->rs_timer, jiffies + when);
268 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
271 if (!delayed_work_pending(&ifp->dad_work))
273 mod_delayed_work(addrconf_wq, &ifp->dad_work, delay);
276 static int snmp6_alloc_dev(struct inet6_dev *idev)
280 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
281 if (!idev->stats.ipv6)
284 for_each_possible_cpu(i) {
285 struct ipstats_mib *addrconf_stats;
286 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
287 u64_stats_init(&addrconf_stats->syncp);
291 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
293 if (!idev->stats.icmpv6dev)
295 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
297 if (!idev->stats.icmpv6msgdev)
303 kfree(idev->stats.icmpv6dev);
305 free_percpu(idev->stats.ipv6);
310 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
312 struct inet6_dev *ndev;
316 if (dev->mtu < IPV6_MIN_MTU)
319 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
324 rwlock_init(&ndev->lock);
326 INIT_LIST_HEAD(&ndev->addr_list);
327 setup_timer(&ndev->rs_timer, addrconf_rs_timer,
328 (unsigned long)ndev);
329 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
330 ndev->cnf.mtu6 = dev->mtu;
331 ndev->cnf.sysctl = NULL;
332 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
333 if (ndev->nd_parms == NULL) {
337 if (ndev->cnf.forwarding)
338 dev_disable_lro(dev);
339 /* We refer to the device */
342 if (snmp6_alloc_dev(ndev) < 0) {
344 "%s: cannot allocate memory for statistics; dev=%s.\n",
345 __func__, dev->name);
346 neigh_parms_release(&nd_tbl, ndev->nd_parms);
352 if (snmp6_register_dev(ndev) < 0) {
354 "%s: cannot create /proc/net/dev_snmp6/%s\n",
355 __func__, dev->name);
356 neigh_parms_release(&nd_tbl, ndev->nd_parms);
358 in6_dev_finish_destroy(ndev);
362 /* One reference from device. We must do this before
363 * we invoke __ipv6_regen_rndid().
367 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
368 ndev->cnf.accept_dad = -1;
370 #if IS_ENABLED(CONFIG_IPV6_SIT)
371 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
372 pr_info("%s: Disabled Multicast RS\n", dev->name);
373 ndev->cnf.rtr_solicits = 0;
377 INIT_LIST_HEAD(&ndev->tempaddr_list);
378 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
379 if ((dev->flags&IFF_LOOPBACK) ||
380 dev->type == ARPHRD_TUNNEL ||
381 dev->type == ARPHRD_TUNNEL6 ||
382 dev->type == ARPHRD_SIT ||
383 dev->type == ARPHRD_NONE) {
384 ndev->cnf.use_tempaddr = -1;
387 ipv6_regen_rndid((unsigned long) ndev);
390 ndev->token = in6addr_any;
392 if (netif_running(dev) && addrconf_qdisc_ok(dev))
393 ndev->if_flags |= IF_READY;
395 ipv6_mc_init_dev(ndev);
396 ndev->tstamp = jiffies;
397 addrconf_sysctl_register(ndev);
398 /* protected by rtnl_lock */
399 rcu_assign_pointer(dev->ip6_ptr, ndev);
401 /* Join interface-local all-node multicast group */
402 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
404 /* Join all-node multicast group */
405 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
407 /* Join all-router multicast group if forwarding is set */
408 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
409 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
414 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
416 struct inet6_dev *idev;
420 idev = __in6_dev_get(dev);
422 idev = ipv6_add_dev(dev);
427 if (dev->flags&IFF_UP)
432 static int inet6_netconf_msgsize_devconf(int type)
434 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
435 + nla_total_size(4); /* NETCONFA_IFINDEX */
437 /* type -1 is used for ALL */
438 if (type == -1 || type == NETCONFA_FORWARDING)
439 size += nla_total_size(4);
440 #ifdef CONFIG_IPV6_MROUTE
441 if (type == -1 || type == NETCONFA_MC_FORWARDING)
442 size += nla_total_size(4);
444 if (type == -1 || type == NETCONFA_PROXY_NEIGH)
445 size += nla_total_size(4);
450 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
451 struct ipv6_devconf *devconf, u32 portid,
452 u32 seq, int event, unsigned int flags,
455 struct nlmsghdr *nlh;
456 struct netconfmsg *ncm;
458 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
463 ncm = nlmsg_data(nlh);
464 ncm->ncm_family = AF_INET6;
466 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
467 goto nla_put_failure;
469 /* type -1 is used for ALL */
470 if ((type == -1 || type == NETCONFA_FORWARDING) &&
471 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
472 goto nla_put_failure;
473 #ifdef CONFIG_IPV6_MROUTE
474 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
475 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
476 devconf->mc_forwarding) < 0)
477 goto nla_put_failure;
479 if ((type == -1 || type == NETCONFA_PROXY_NEIGH) &&
480 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
481 goto nla_put_failure;
483 return nlmsg_end(skb, nlh);
486 nlmsg_cancel(skb, nlh);
490 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
491 struct ipv6_devconf *devconf)
496 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
500 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
501 RTM_NEWNETCONF, 0, type);
503 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
504 WARN_ON(err == -EMSGSIZE);
508 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
511 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
514 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
515 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
516 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
517 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
520 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
521 struct nlmsghdr *nlh)
523 struct net *net = sock_net(in_skb->sk);
524 struct nlattr *tb[NETCONFA_MAX+1];
525 struct netconfmsg *ncm;
527 struct ipv6_devconf *devconf;
528 struct inet6_dev *in6_dev;
529 struct net_device *dev;
533 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
534 devconf_ipv6_policy);
539 if (!tb[NETCONFA_IFINDEX])
542 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
544 case NETCONFA_IFINDEX_ALL:
545 devconf = net->ipv6.devconf_all;
547 case NETCONFA_IFINDEX_DEFAULT:
548 devconf = net->ipv6.devconf_dflt;
551 dev = __dev_get_by_index(net, ifindex);
554 in6_dev = __in6_dev_get(dev);
557 devconf = &in6_dev->cnf;
562 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
566 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
567 NETLINK_CB(in_skb).portid,
568 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
571 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
572 WARN_ON(err == -EMSGSIZE);
576 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
581 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
582 struct netlink_callback *cb)
584 struct net *net = sock_net(skb->sk);
587 struct net_device *dev;
588 struct inet6_dev *idev;
589 struct hlist_head *head;
592 s_idx = idx = cb->args[1];
594 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
596 head = &net->dev_index_head[h];
598 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
600 hlist_for_each_entry_rcu(dev, head, index_hlist) {
603 idev = __in6_dev_get(dev);
607 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
609 NETLINK_CB(cb->skb).portid,
617 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
623 if (h == NETDEV_HASHENTRIES) {
624 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
625 net->ipv6.devconf_all,
626 NETLINK_CB(cb->skb).portid,
628 RTM_NEWNETCONF, NLM_F_MULTI,
634 if (h == NETDEV_HASHENTRIES + 1) {
635 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
636 net->ipv6.devconf_dflt,
637 NETLINK_CB(cb->skb).portid,
639 RTM_NEWNETCONF, NLM_F_MULTI,
653 static void dev_forward_change(struct inet6_dev *idev)
655 struct net_device *dev;
656 struct inet6_ifaddr *ifa;
661 if (idev->cnf.forwarding)
662 dev_disable_lro(dev);
663 if (dev->flags & IFF_MULTICAST) {
664 if (idev->cnf.forwarding) {
665 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
666 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
667 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
669 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
670 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
671 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
675 list_for_each_entry(ifa, &idev->addr_list, if_list) {
676 if (ifa->flags&IFA_F_TENTATIVE)
678 if (idev->cnf.forwarding)
679 addrconf_join_anycast(ifa);
681 addrconf_leave_anycast(ifa);
683 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
684 dev->ifindex, &idev->cnf);
688 static void addrconf_forward_change(struct net *net, __s32 newf)
690 struct net_device *dev;
691 struct inet6_dev *idev;
693 for_each_netdev(net, dev) {
694 idev = __in6_dev_get(dev);
696 int changed = (!idev->cnf.forwarding) ^ (!newf);
697 idev->cnf.forwarding = newf;
699 dev_forward_change(idev);
704 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
710 return restart_syscall();
712 net = (struct net *)table->extra2;
716 if (p == &net->ipv6.devconf_dflt->forwarding) {
717 if ((!newf) ^ (!old))
718 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
719 NETCONFA_IFINDEX_DEFAULT,
720 net->ipv6.devconf_dflt);
725 if (p == &net->ipv6.devconf_all->forwarding) {
726 net->ipv6.devconf_dflt->forwarding = newf;
727 addrconf_forward_change(net, newf);
728 if ((!newf) ^ (!old))
729 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
730 NETCONFA_IFINDEX_ALL,
731 net->ipv6.devconf_all);
732 } else if ((!newf) ^ (!old))
733 dev_forward_change((struct inet6_dev *)table->extra1);
737 rt6_purge_dflt_routers(net);
742 /* Nobody refers to this ifaddr, destroy it */
743 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
745 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
747 #ifdef NET_REFCNT_DEBUG
748 pr_debug("%s\n", __func__);
751 in6_dev_put(ifp->idev);
753 if (cancel_delayed_work(&ifp->dad_work))
754 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
757 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
758 pr_warn("Freeing alive inet6 address %p\n", ifp);
767 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
770 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
773 * Each device address list is sorted in order of scope -
774 * global before linklocal.
776 list_for_each(p, &idev->addr_list) {
777 struct inet6_ifaddr *ifa
778 = list_entry(p, struct inet6_ifaddr, if_list);
779 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
783 list_add_tail(&ifp->if_list, p);
786 static u32 inet6_addr_hash(const struct in6_addr *addr)
788 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
791 /* On success it returns ifp with increased reference count */
793 static struct inet6_ifaddr *
794 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
795 const struct in6_addr *peer_addr, int pfxlen,
796 int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
798 struct inet6_ifaddr *ifa = NULL;
802 int addr_type = ipv6_addr_type(addr);
804 if (addr_type == IPV6_ADDR_ANY ||
805 addr_type & IPV6_ADDR_MULTICAST ||
806 (!(idev->dev->flags & IFF_LOOPBACK) &&
807 addr_type & IPV6_ADDR_LOOPBACK))
808 return ERR_PTR(-EADDRNOTAVAIL);
812 err = -ENODEV; /*XXX*/
816 if (idev->cnf.disable_ipv6) {
821 spin_lock(&addrconf_hash_lock);
823 /* Ignore adding duplicate addresses on an interface */
824 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
825 ADBG("ipv6_add_addr: already assigned\n");
830 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
833 ADBG("ipv6_add_addr: malloc failed\n");
838 rt = addrconf_dst_alloc(idev, addr, false);
844 neigh_parms_data_state_setall(idev->nd_parms);
848 ifa->peer_addr = *peer_addr;
850 spin_lock_init(&ifa->lock);
851 spin_lock_init(&ifa->state_lock);
852 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
853 INIT_HLIST_NODE(&ifa->addr_lst);
855 ifa->prefix_len = pfxlen;
856 ifa->flags = flags | IFA_F_TENTATIVE;
857 ifa->valid_lft = valid_lft;
858 ifa->prefered_lft = prefered_lft;
859 ifa->cstamp = ifa->tstamp = jiffies;
860 ifa->tokenized = false;
869 /* Add to big hash table */
870 hash = inet6_addr_hash(addr);
872 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
873 spin_unlock(&addrconf_hash_lock);
875 write_lock(&idev->lock);
876 /* Add to inet6_dev unicast addr list. */
877 ipv6_link_dev_addr(idev, ifa);
879 if (ifa->flags&IFA_F_TEMPORARY) {
880 list_add(&ifa->tmp_list, &idev->tempaddr_list);
885 write_unlock(&idev->lock);
887 rcu_read_unlock_bh();
889 if (likely(err == 0))
890 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
898 spin_unlock(&addrconf_hash_lock);
902 enum cleanup_prefix_rt_t {
903 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
904 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
905 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
909 * Check, whether the prefix for ifp would still need a prefix route
910 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
913 * 1) we don't purge prefix if address was not permanent.
914 * prefix is managed by its own lifetime.
915 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
916 * 3) if there are no addresses, delete prefix.
917 * 4) if there are still other permanent address(es),
918 * corresponding prefix is still permanent.
919 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
920 * don't purge the prefix, assume user space is managing it.
921 * 6) otherwise, update prefix lifetime to the
922 * longest valid lifetime among the corresponding
923 * addresses on the device.
924 * Note: subsequent RA will update lifetime.
926 static enum cleanup_prefix_rt_t
927 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
929 struct inet6_ifaddr *ifa;
930 struct inet6_dev *idev = ifp->idev;
931 unsigned long lifetime;
932 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
936 list_for_each_entry(ifa, &idev->addr_list, if_list) {
939 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
942 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
943 return CLEANUP_PREFIX_RT_NOP;
945 action = CLEANUP_PREFIX_RT_EXPIRE;
947 spin_lock(&ifa->lock);
949 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
951 * Note: Because this address is
952 * not permanent, lifetime <
953 * LONG_MAX / HZ here.
955 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
956 *expires = ifa->tstamp + lifetime * HZ;
957 spin_unlock(&ifa->lock);
964 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
968 rt = addrconf_get_prefix_route(&ifp->addr,
971 0, RTF_GATEWAY | RTF_DEFAULT);
976 if (!(rt->rt6i_flags & RTF_EXPIRES))
977 rt6_set_expires(rt, expires);
984 /* This function wants to get referenced ifp and releases it before return */
986 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
989 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
990 unsigned long expires;
994 spin_lock_bh(&ifp->state_lock);
996 ifp->state = INET6_IFADDR_STATE_DEAD;
997 spin_unlock_bh(&ifp->state_lock);
999 if (state == INET6_IFADDR_STATE_DEAD)
1002 spin_lock_bh(&addrconf_hash_lock);
1003 hlist_del_init_rcu(&ifp->addr_lst);
1004 spin_unlock_bh(&addrconf_hash_lock);
1006 write_lock_bh(&ifp->idev->lock);
1008 if (ifp->flags&IFA_F_TEMPORARY) {
1009 list_del(&ifp->tmp_list);
1011 in6_ifa_put(ifp->ifpub);
1017 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1018 action = check_cleanup_prefix_route(ifp, &expires);
1020 list_del_init(&ifp->if_list);
1023 write_unlock_bh(&ifp->idev->lock);
1025 addrconf_del_dad_work(ifp);
1027 ipv6_ifa_notify(RTM_DELADDR, ifp);
1029 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1031 if (action != CLEANUP_PREFIX_RT_NOP) {
1032 cleanup_prefix_route(ifp, expires,
1033 action == CLEANUP_PREFIX_RT_DEL);
1036 /* clean up prefsrc entries */
1037 rt6_remove_prefsrc(ifp);
1042 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1044 struct inet6_dev *idev = ifp->idev;
1045 struct in6_addr addr, *tmpaddr;
1046 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1047 unsigned long regen_advance;
1051 unsigned long now = jiffies;
1053 write_lock_bh(&idev->lock);
1055 spin_lock_bh(&ift->lock);
1056 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1057 spin_unlock_bh(&ift->lock);
1064 if (idev->cnf.use_tempaddr <= 0) {
1065 write_unlock_bh(&idev->lock);
1066 pr_info("%s: use_tempaddr is disabled\n", __func__);
1071 spin_lock_bh(&ifp->lock);
1072 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1073 idev->cnf.use_tempaddr = -1; /*XXX*/
1074 spin_unlock_bh(&ifp->lock);
1075 write_unlock_bh(&idev->lock);
1076 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1083 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1084 __ipv6_try_regen_rndid(idev, tmpaddr);
1085 memcpy(&addr.s6_addr[8], idev->rndid, 8);
1086 age = (now - ifp->tstamp) / HZ;
1087 tmp_valid_lft = min_t(__u32,
1089 idev->cnf.temp_valid_lft + age);
1090 tmp_prefered_lft = min_t(__u32,
1092 idev->cnf.temp_prefered_lft + age -
1093 idev->cnf.max_desync_factor);
1094 tmp_plen = ifp->prefix_len;
1095 tmp_tstamp = ifp->tstamp;
1096 spin_unlock_bh(&ifp->lock);
1098 regen_advance = idev->cnf.regen_max_retry *
1099 idev->cnf.dad_transmits *
1100 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1101 write_unlock_bh(&idev->lock);
1103 /* A temporary address is created only if this calculated Preferred
1104 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1105 * an implementation must not create a temporary address with a zero
1106 * Preferred Lifetime.
1107 * Use age calculation as in addrconf_verify to avoid unnecessary
1108 * temporary addresses being generated.
1110 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1111 if (tmp_prefered_lft <= regen_advance + age) {
1118 addr_flags = IFA_F_TEMPORARY;
1119 /* set in addrconf_prefix_rcv() */
1120 if (ifp->flags & IFA_F_OPTIMISTIC)
1121 addr_flags |= IFA_F_OPTIMISTIC;
1123 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1124 ipv6_addr_scope(&addr), addr_flags,
1125 tmp_valid_lft, tmp_prefered_lft);
1129 pr_info("%s: retry temporary address regeneration\n", __func__);
1131 write_lock_bh(&idev->lock);
1135 spin_lock_bh(&ift->lock);
1138 ift->tstamp = tmp_tstamp;
1139 spin_unlock_bh(&ift->lock);
1141 addrconf_dad_start(ift);
1149 * Choose an appropriate source address (RFC3484)
1152 IPV6_SADDR_RULE_INIT = 0,
1153 IPV6_SADDR_RULE_LOCAL,
1154 IPV6_SADDR_RULE_SCOPE,
1155 IPV6_SADDR_RULE_PREFERRED,
1156 #ifdef CONFIG_IPV6_MIP6
1157 IPV6_SADDR_RULE_HOA,
1159 IPV6_SADDR_RULE_OIF,
1160 IPV6_SADDR_RULE_LABEL,
1161 IPV6_SADDR_RULE_PRIVACY,
1162 IPV6_SADDR_RULE_ORCHID,
1163 IPV6_SADDR_RULE_PREFIX,
1167 struct ipv6_saddr_score {
1170 struct inet6_ifaddr *ifa;
1171 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1176 struct ipv6_saddr_dst {
1177 const struct in6_addr *addr;
1184 static inline int ipv6_saddr_preferred(int type)
1186 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1191 static int ipv6_get_saddr_eval(struct net *net,
1192 struct ipv6_saddr_score *score,
1193 struct ipv6_saddr_dst *dst,
1198 if (i <= score->rule) {
1200 case IPV6_SADDR_RULE_SCOPE:
1201 ret = score->scopedist;
1203 case IPV6_SADDR_RULE_PREFIX:
1204 ret = score->matchlen;
1207 ret = !!test_bit(i, score->scorebits);
1213 case IPV6_SADDR_RULE_INIT:
1214 /* Rule 0: remember if hiscore is not ready yet */
1217 case IPV6_SADDR_RULE_LOCAL:
1218 /* Rule 1: Prefer same address */
1219 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1221 case IPV6_SADDR_RULE_SCOPE:
1222 /* Rule 2: Prefer appropriate scope
1227 * ---+--+-+---> scope
1229 * | d is scope of the destination.
1231 * | \ <- smaller scope is better if
1232 * B-15 | \ if scope is enough for destination.
1233 * | ret = B - scope (-1 <= scope >= d <= 15).
1235 * |/ <- greater is better
1236 * -C / if scope is not enough for destination.
1237 * /| ret = scope - C (-1 <= d < scope <= 15).
1239 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1240 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1241 * Assume B = 0 and we get C > 29.
1243 ret = __ipv6_addr_src_scope(score->addr_type);
1244 if (ret >= dst->scope)
1247 ret -= 128; /* 30 is enough */
1248 score->scopedist = ret;
1250 case IPV6_SADDR_RULE_PREFERRED:
1251 /* Rule 3: Avoid deprecated and optimistic addresses */
1252 ret = ipv6_saddr_preferred(score->addr_type) ||
1253 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1255 #ifdef CONFIG_IPV6_MIP6
1256 case IPV6_SADDR_RULE_HOA:
1258 /* Rule 4: Prefer home address */
1259 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1260 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1264 case IPV6_SADDR_RULE_OIF:
1265 /* Rule 5: Prefer outgoing interface */
1266 ret = (!dst->ifindex ||
1267 dst->ifindex == score->ifa->idev->dev->ifindex);
1269 case IPV6_SADDR_RULE_LABEL:
1270 /* Rule 6: Prefer matching label */
1271 ret = ipv6_addr_label(net,
1272 &score->ifa->addr, score->addr_type,
1273 score->ifa->idev->dev->ifindex) == dst->label;
1275 case IPV6_SADDR_RULE_PRIVACY:
1277 /* Rule 7: Prefer public address
1278 * Note: prefer temporary address if use_tempaddr >= 2
1280 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1281 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1282 score->ifa->idev->cnf.use_tempaddr >= 2;
1283 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1286 case IPV6_SADDR_RULE_ORCHID:
1287 /* Rule 8-: Prefer ORCHID vs ORCHID or
1288 * non-ORCHID vs non-ORCHID
1290 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1291 ipv6_addr_orchid(dst->addr));
1293 case IPV6_SADDR_RULE_PREFIX:
1294 /* Rule 8: Use longest matching prefix */
1295 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1296 if (ret > score->ifa->prefix_len)
1297 ret = score->ifa->prefix_len;
1298 score->matchlen = ret;
1305 __set_bit(i, score->scorebits);
1311 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1312 const struct in6_addr *daddr, unsigned int prefs,
1313 struct in6_addr *saddr)
1315 struct ipv6_saddr_score scores[2],
1316 *score = &scores[0], *hiscore = &scores[1];
1317 struct ipv6_saddr_dst dst;
1318 struct net_device *dev;
1321 dst_type = __ipv6_addr_type(daddr);
1323 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1324 dst.scope = __ipv6_addr_src_scope(dst_type);
1325 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1329 hiscore->ifa = NULL;
1333 for_each_netdev_rcu(net, dev) {
1334 struct inet6_dev *idev;
1336 /* Candidate Source Address (section 4)
1337 * - multicast and link-local destination address,
1338 * the set of candidate source address MUST only
1339 * include addresses assigned to interfaces
1340 * belonging to the same link as the outgoing
1342 * (- For site-local destination addresses, the
1343 * set of candidate source addresses MUST only
1344 * include addresses assigned to interfaces
1345 * belonging to the same site as the outgoing
1348 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1349 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1350 dst.ifindex && dev->ifindex != dst.ifindex)
1353 idev = __in6_dev_get(dev);
1357 read_lock_bh(&idev->lock);
1358 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1362 * - Tentative Address (RFC2462 section 5.4)
1363 * - A tentative address is not considered
1364 * "assigned to an interface" in the traditional
1365 * sense, unless it is also flagged as optimistic.
1366 * - Candidate Source Address (section 4)
1367 * - In any case, anycast addresses, multicast
1368 * addresses, and the unspecified address MUST
1369 * NOT be included in a candidate set.
1371 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1372 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1375 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1377 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1378 score->addr_type & IPV6_ADDR_MULTICAST)) {
1379 LIMIT_NETDEBUG(KERN_DEBUG
1380 "ADDRCONF: unspecified / multicast address "
1381 "assigned as unicast address on %s",
1387 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1389 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1390 int minihiscore, miniscore;
1392 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1393 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1395 if (minihiscore > miniscore) {
1396 if (i == IPV6_SADDR_RULE_SCOPE &&
1397 score->scopedist > 0) {
1400 * each remaining entry
1401 * has too small (not enough)
1402 * scope, because ifa entries
1403 * are sorted by their scope
1409 } else if (minihiscore < miniscore) {
1411 in6_ifa_put(hiscore->ifa);
1413 in6_ifa_hold(score->ifa);
1415 swap(hiscore, score);
1417 /* restore our iterator */
1418 score->ifa = hiscore->ifa;
1425 read_unlock_bh(&idev->lock);
1430 return -EADDRNOTAVAIL;
1432 *saddr = hiscore->ifa->addr;
1433 in6_ifa_put(hiscore->ifa);
1436 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1438 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1441 struct inet6_ifaddr *ifp;
1442 int err = -EADDRNOTAVAIL;
1444 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1445 if (ifp->scope > IFA_LINK)
1447 if (ifp->scope == IFA_LINK &&
1448 !(ifp->flags & banned_flags)) {
1457 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1460 struct inet6_dev *idev;
1461 int err = -EADDRNOTAVAIL;
1464 idev = __in6_dev_get(dev);
1466 read_lock_bh(&idev->lock);
1467 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1468 read_unlock_bh(&idev->lock);
1474 static int ipv6_count_addresses(struct inet6_dev *idev)
1477 struct inet6_ifaddr *ifp;
1479 read_lock_bh(&idev->lock);
1480 list_for_each_entry(ifp, &idev->addr_list, if_list)
1482 read_unlock_bh(&idev->lock);
1486 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1487 const struct net_device *dev, int strict)
1489 struct inet6_ifaddr *ifp;
1490 unsigned int hash = inet6_addr_hash(addr);
1493 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1494 if (!net_eq(dev_net(ifp->idev->dev), net))
1496 if (ipv6_addr_equal(&ifp->addr, addr) &&
1497 !(ifp->flags&IFA_F_TENTATIVE) &&
1498 (dev == NULL || ifp->idev->dev == dev ||
1499 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1500 rcu_read_unlock_bh();
1505 rcu_read_unlock_bh();
1508 EXPORT_SYMBOL(ipv6_chk_addr);
1510 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1511 struct net_device *dev)
1513 unsigned int hash = inet6_addr_hash(addr);
1514 struct inet6_ifaddr *ifp;
1516 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1517 if (!net_eq(dev_net(ifp->idev->dev), net))
1519 if (ipv6_addr_equal(&ifp->addr, addr)) {
1520 if (dev == NULL || ifp->idev->dev == dev)
1527 /* Compares an address/prefix_len with addresses on device @dev.
1528 * If one is found it returns true.
1530 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1531 const unsigned int prefix_len, struct net_device *dev)
1533 struct inet6_dev *idev;
1534 struct inet6_ifaddr *ifa;
1538 idev = __in6_dev_get(dev);
1540 read_lock_bh(&idev->lock);
1541 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1542 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1546 read_unlock_bh(&idev->lock);
1552 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1554 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1556 struct inet6_dev *idev;
1557 struct inet6_ifaddr *ifa;
1562 idev = __in6_dev_get(dev);
1564 read_lock_bh(&idev->lock);
1565 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1566 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1571 read_unlock_bh(&idev->lock);
1576 EXPORT_SYMBOL(ipv6_chk_prefix);
1578 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1579 struct net_device *dev, int strict)
1581 struct inet6_ifaddr *ifp, *result = NULL;
1582 unsigned int hash = inet6_addr_hash(addr);
1585 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1586 if (!net_eq(dev_net(ifp->idev->dev), net))
1588 if (ipv6_addr_equal(&ifp->addr, addr)) {
1589 if (dev == NULL || ifp->idev->dev == dev ||
1590 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1597 rcu_read_unlock_bh();
1602 /* Gets referenced address, destroys ifaddr */
1604 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1606 if (ifp->flags&IFA_F_PERMANENT) {
1607 spin_lock_bh(&ifp->lock);
1608 addrconf_del_dad_work(ifp);
1609 ifp->flags |= IFA_F_TENTATIVE;
1611 ifp->flags |= IFA_F_DADFAILED;
1612 spin_unlock_bh(&ifp->lock);
1614 ipv6_ifa_notify(0, ifp);
1616 } else if (ifp->flags&IFA_F_TEMPORARY) {
1617 struct inet6_ifaddr *ifpub;
1618 spin_lock_bh(&ifp->lock);
1621 in6_ifa_hold(ifpub);
1622 spin_unlock_bh(&ifp->lock);
1623 ipv6_create_tempaddr(ifpub, ifp);
1626 spin_unlock_bh(&ifp->lock);
1634 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1638 spin_lock_bh(&ifp->state_lock);
1639 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1640 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1643 spin_unlock_bh(&ifp->state_lock);
1648 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1650 struct inet6_dev *idev = ifp->idev;
1652 if (addrconf_dad_end(ifp)) {
1657 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1658 ifp->idev->dev->name, &ifp->addr);
1660 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1661 struct in6_addr addr;
1663 addr.s6_addr32[0] = htonl(0xfe800000);
1664 addr.s6_addr32[1] = 0;
1666 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1667 ipv6_addr_equal(&ifp->addr, &addr)) {
1668 /* DAD failed for link-local based on MAC address */
1669 idev->cnf.disable_ipv6 = 1;
1671 pr_info("%s: IPv6 being disabled!\n",
1672 ifp->idev->dev->name);
1676 spin_lock_bh(&ifp->state_lock);
1677 /* transition from _POSTDAD to _ERRDAD */
1678 ifp->state = INET6_IFADDR_STATE_ERRDAD;
1679 spin_unlock_bh(&ifp->state_lock);
1681 addrconf_mod_dad_work(ifp, 0);
1684 /* Join to solicited addr multicast group. */
1686 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1688 struct in6_addr maddr;
1692 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1695 addrconf_addr_solict_mult(addr, &maddr);
1696 ipv6_dev_mc_inc(dev, &maddr);
1699 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1701 struct in6_addr maddr;
1705 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1708 addrconf_addr_solict_mult(addr, &maddr);
1709 __ipv6_dev_mc_dec(idev, &maddr);
1712 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1714 struct in6_addr addr;
1718 if (ifp->prefix_len >= 127) /* RFC 6164 */
1720 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1721 if (ipv6_addr_any(&addr))
1723 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1726 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1728 struct in6_addr addr;
1732 if (ifp->prefix_len >= 127) /* RFC 6164 */
1734 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1735 if (ipv6_addr_any(&addr))
1737 __ipv6_dev_ac_dec(ifp->idev, &addr);
1740 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1742 if (dev->addr_len != ETH_ALEN)
1744 memcpy(eui, dev->dev_addr, 3);
1745 memcpy(eui + 5, dev->dev_addr + 3, 3);
1748 * The zSeries OSA network cards can be shared among various
1749 * OS instances, but the OSA cards have only one MAC address.
1750 * This leads to duplicate address conflicts in conjunction
1751 * with IPv6 if more than one instance uses the same card.
1753 * The driver for these cards can deliver a unique 16-bit
1754 * identifier for each instance sharing the same card. It is
1755 * placed instead of 0xFFFE in the interface identifier. The
1756 * "u" bit of the interface identifier is not inverted in this
1757 * case. Hence the resulting interface identifier has local
1758 * scope according to RFC2373.
1761 eui[3] = (dev->dev_id >> 8) & 0xFF;
1762 eui[4] = dev->dev_id & 0xFF;
1771 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1773 if (dev->addr_len != IEEE802154_ADDR_LEN)
1775 memcpy(eui, dev->dev_addr, 8);
1780 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1782 union fwnet_hwaddr *ha;
1784 if (dev->addr_len != FWNET_ALEN)
1787 ha = (union fwnet_hwaddr *)dev->dev_addr;
1789 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1794 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1796 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1797 if (dev->addr_len != ARCNET_ALEN)
1800 eui[7] = *(u8 *)dev->dev_addr;
1804 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1806 if (dev->addr_len != INFINIBAND_ALEN)
1808 memcpy(eui, dev->dev_addr + 12, 8);
1813 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1817 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1818 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1819 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1820 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1821 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1822 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1826 memcpy(eui + 4, &addr, 4);
1830 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1832 if (dev->priv_flags & IFF_ISATAP)
1833 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1837 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1839 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1842 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
1844 memcpy(eui, dev->perm_addr, 3);
1845 memcpy(eui + 5, dev->perm_addr + 3, 3);
1852 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1854 switch (dev->type) {
1857 return addrconf_ifid_eui48(eui, dev);
1859 return addrconf_ifid_arcnet(eui, dev);
1860 case ARPHRD_INFINIBAND:
1861 return addrconf_ifid_infiniband(eui, dev);
1863 return addrconf_ifid_sit(eui, dev);
1865 return addrconf_ifid_gre(eui, dev);
1866 case ARPHRD_6LOWPAN:
1867 case ARPHRD_IEEE802154:
1868 return addrconf_ifid_eui64(eui, dev);
1869 case ARPHRD_IEEE1394:
1870 return addrconf_ifid_ieee1394(eui, dev);
1871 case ARPHRD_TUNNEL6:
1872 return addrconf_ifid_ip6tnl(eui, dev);
1877 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1880 struct inet6_ifaddr *ifp;
1882 read_lock_bh(&idev->lock);
1883 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1884 if (ifp->scope > IFA_LINK)
1886 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1887 memcpy(eui, ifp->addr.s6_addr+8, 8);
1892 read_unlock_bh(&idev->lock);
1896 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1897 static void __ipv6_regen_rndid(struct inet6_dev *idev)
1900 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1901 idev->rndid[0] &= ~0x02;
1904 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1905 * check if generated address is not inappropriate
1907 * - Reserved subnet anycast (RFC 2526)
1908 * 11111101 11....11 1xxxxxxx
1909 * - ISATAP (RFC4214) 6.1
1910 * 00-00-5E-FE-xx-xx-xx-xx
1912 * - XXX: already assigned to an address on the device
1914 if (idev->rndid[0] == 0xfd &&
1915 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1916 (idev->rndid[7]&0x80))
1918 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1919 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1921 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1926 static void ipv6_regen_rndid(unsigned long data)
1928 struct inet6_dev *idev = (struct inet6_dev *) data;
1929 unsigned long expires;
1932 write_lock_bh(&idev->lock);
1937 __ipv6_regen_rndid(idev);
1940 idev->cnf.temp_prefered_lft * HZ -
1941 idev->cnf.regen_max_retry * idev->cnf.dad_transmits *
1942 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) -
1943 idev->cnf.max_desync_factor * HZ;
1944 if (time_before(expires, jiffies)) {
1945 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
1946 __func__, idev->dev->name);
1950 if (!mod_timer(&idev->regen_timer, expires))
1954 write_unlock_bh(&idev->lock);
1955 rcu_read_unlock_bh();
1959 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
1961 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1962 __ipv6_regen_rndid(idev);
1970 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1971 unsigned long expires, u32 flags)
1973 struct fib6_config cfg = {
1974 .fc_table = RT6_TABLE_PREFIX,
1975 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1976 .fc_ifindex = dev->ifindex,
1977 .fc_expires = expires,
1979 .fc_flags = RTF_UP | flags,
1980 .fc_nlinfo.nl_net = dev_net(dev),
1981 .fc_protocol = RTPROT_KERNEL,
1986 /* Prevent useless cloning on PtP SIT.
1987 This thing is done here expecting that the whole
1988 class of non-broadcast devices need not cloning.
1990 #if IS_ENABLED(CONFIG_IPV6_SIT)
1991 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1992 cfg.fc_flags |= RTF_NONEXTHOP;
1995 ip6_route_add(&cfg);
1999 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2001 const struct net_device *dev,
2002 u32 flags, u32 noflags)
2004 struct fib6_node *fn;
2005 struct rt6_info *rt = NULL;
2006 struct fib6_table *table;
2008 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
2012 read_lock_bh(&table->tb6_lock);
2013 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2016 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2017 if (rt->dst.dev->ifindex != dev->ifindex)
2019 if ((rt->rt6i_flags & flags) != flags)
2021 if ((rt->rt6i_flags & noflags) != 0)
2027 read_unlock_bh(&table->tb6_lock);
2032 /* Create "default" multicast route to the interface */
2034 static void addrconf_add_mroute(struct net_device *dev)
2036 struct fib6_config cfg = {
2037 .fc_table = RT6_TABLE_LOCAL,
2038 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2039 .fc_ifindex = dev->ifindex,
2042 .fc_nlinfo.nl_net = dev_net(dev),
2045 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2047 ip6_route_add(&cfg);
2050 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2052 struct inet6_dev *idev;
2056 idev = ipv6_find_idev(dev);
2058 return ERR_PTR(-ENOBUFS);
2060 if (idev->cnf.disable_ipv6)
2061 return ERR_PTR(-EACCES);
2063 /* Add default multicast route */
2064 if (!(dev->flags & IFF_LOOPBACK))
2065 addrconf_add_mroute(dev);
2070 static void manage_tempaddrs(struct inet6_dev *idev,
2071 struct inet6_ifaddr *ifp,
2072 __u32 valid_lft, __u32 prefered_lft,
2073 bool create, unsigned long now)
2076 struct inet6_ifaddr *ift;
2078 read_lock_bh(&idev->lock);
2079 /* update all temporary addresses in the list */
2080 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2081 int age, max_valid, max_prefered;
2083 if (ifp != ift->ifpub)
2086 /* RFC 4941 section 3.3:
2087 * If a received option will extend the lifetime of a public
2088 * address, the lifetimes of temporary addresses should
2089 * be extended, subject to the overall constraint that no
2090 * temporary addresses should ever remain "valid" or "preferred"
2091 * for a time longer than (TEMP_VALID_LIFETIME) or
2092 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2094 age = (now - ift->cstamp) / HZ;
2095 max_valid = idev->cnf.temp_valid_lft - age;
2099 max_prefered = idev->cnf.temp_prefered_lft -
2100 idev->cnf.max_desync_factor - age;
2101 if (max_prefered < 0)
2104 if (valid_lft > max_valid)
2105 valid_lft = max_valid;
2107 if (prefered_lft > max_prefered)
2108 prefered_lft = max_prefered;
2110 spin_lock(&ift->lock);
2112 ift->valid_lft = valid_lft;
2113 ift->prefered_lft = prefered_lft;
2115 if (prefered_lft > 0)
2116 ift->flags &= ~IFA_F_DEPRECATED;
2118 spin_unlock(&ift->lock);
2119 if (!(flags&IFA_F_TENTATIVE))
2120 ipv6_ifa_notify(0, ift);
2123 if ((create || list_empty(&idev->tempaddr_list)) &&
2124 idev->cnf.use_tempaddr > 0) {
2125 /* When a new public address is created as described
2126 * in [ADDRCONF], also create a new temporary address.
2127 * Also create a temporary address if it's enabled but
2128 * no temporary address currently exists.
2130 read_unlock_bh(&idev->lock);
2131 ipv6_create_tempaddr(ifp, NULL);
2133 read_unlock_bh(&idev->lock);
2137 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2139 struct prefix_info *pinfo;
2143 struct inet6_dev *in6_dev;
2144 struct net *net = dev_net(dev);
2146 pinfo = (struct prefix_info *) opt;
2148 if (len < sizeof(struct prefix_info)) {
2149 ADBG("addrconf: prefix option too short\n");
2154 * Validation checks ([ADDRCONF], page 19)
2157 addr_type = ipv6_addr_type(&pinfo->prefix);
2159 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2162 valid_lft = ntohl(pinfo->valid);
2163 prefered_lft = ntohl(pinfo->prefered);
2165 if (prefered_lft > valid_lft) {
2166 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2170 in6_dev = in6_dev_get(dev);
2172 if (in6_dev == NULL) {
2173 net_dbg_ratelimited("addrconf: device %s not configured\n",
2179 * Two things going on here:
2180 * 1) Add routes for on-link prefixes
2181 * 2) Configure prefixes with the auto flag set
2184 if (pinfo->onlink) {
2185 struct rt6_info *rt;
2186 unsigned long rt_expires;
2188 /* Avoid arithmetic overflow. Really, we could
2189 * save rt_expires in seconds, likely valid_lft,
2190 * but it would require division in fib gc, that it
2194 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2196 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2198 if (addrconf_finite_timeout(rt_expires))
2201 rt = addrconf_get_prefix_route(&pinfo->prefix,
2204 RTF_ADDRCONF | RTF_PREFIX_RT,
2205 RTF_GATEWAY | RTF_DEFAULT);
2208 /* Autoconf prefix route */
2209 if (valid_lft == 0) {
2212 } else if (addrconf_finite_timeout(rt_expires)) {
2214 rt6_set_expires(rt, jiffies + rt_expires);
2216 rt6_clean_expires(rt);
2218 } else if (valid_lft) {
2219 clock_t expires = 0;
2220 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2221 if (addrconf_finite_timeout(rt_expires)) {
2223 flags |= RTF_EXPIRES;
2224 expires = jiffies_to_clock_t(rt_expires);
2226 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2227 dev, expires, flags);
2232 /* Try to figure out our local address for this prefix */
2234 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2235 struct inet6_ifaddr *ifp;
2236 struct in6_addr addr;
2237 int create = 0, update_lft = 0;
2238 bool tokenized = false;
2240 if (pinfo->prefix_len == 64) {
2241 memcpy(&addr, &pinfo->prefix, 8);
2243 if (!ipv6_addr_any(&in6_dev->token)) {
2244 read_lock_bh(&in6_dev->lock);
2245 memcpy(addr.s6_addr + 8,
2246 in6_dev->token.s6_addr + 8, 8);
2247 read_unlock_bh(&in6_dev->lock);
2249 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2250 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2251 in6_dev_put(in6_dev);
2256 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2258 in6_dev_put(in6_dev);
2263 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
2265 if (ifp == NULL && valid_lft) {
2266 int max_addresses = in6_dev->cnf.max_addresses;
2269 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2270 if (in6_dev->cnf.optimistic_dad &&
2271 !net->ipv6.devconf_all->forwarding && sllao)
2272 addr_flags = IFA_F_OPTIMISTIC;
2275 /* Do not allow to create too much of autoconfigured
2276 * addresses; this would be too easy way to crash kernel.
2278 if (!max_addresses ||
2279 ipv6_count_addresses(in6_dev) < max_addresses)
2280 ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2282 addr_type&IPV6_ADDR_SCOPE_MASK,
2283 addr_flags, valid_lft,
2286 if (IS_ERR_OR_NULL(ifp)) {
2287 in6_dev_put(in6_dev);
2293 spin_lock_bh(&ifp->lock);
2294 ifp->flags |= IFA_F_MANAGETEMPADDR;
2295 ifp->cstamp = jiffies;
2296 ifp->tokenized = tokenized;
2297 spin_unlock_bh(&ifp->lock);
2298 addrconf_dad_start(ifp);
2306 /* update lifetime (RFC2462 5.5.3 e) */
2307 spin_lock(&ifp->lock);
2309 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2310 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2313 if (!update_lft && !create && stored_lft) {
2314 const u32 minimum_lft = min(
2315 stored_lft, (u32)MIN_VALID_LIFETIME);
2316 valid_lft = max(valid_lft, minimum_lft);
2318 /* RFC4862 Section 5.5.3e:
2319 * "Note that the preferred lifetime of the
2320 * corresponding address is always reset to
2321 * the Preferred Lifetime in the received
2322 * Prefix Information option, regardless of
2323 * whether the valid lifetime is also reset or
2326 * So we should always update prefered_lft here.
2332 ifp->valid_lft = valid_lft;
2333 ifp->prefered_lft = prefered_lft;
2336 ifp->flags &= ~IFA_F_DEPRECATED;
2337 spin_unlock(&ifp->lock);
2339 if (!(flags&IFA_F_TENTATIVE))
2340 ipv6_ifa_notify(0, ifp);
2342 spin_unlock(&ifp->lock);
2344 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2351 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2352 in6_dev_put(in6_dev);
2356 * Set destination address.
2357 * Special case for SIT interfaces where we create a new "virtual"
2360 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2362 struct in6_ifreq ireq;
2363 struct net_device *dev;
2369 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2372 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2378 #if IS_ENABLED(CONFIG_IPV6_SIT)
2379 if (dev->type == ARPHRD_SIT) {
2380 const struct net_device_ops *ops = dev->netdev_ops;
2382 struct ip_tunnel_parm p;
2384 err = -EADDRNOTAVAIL;
2385 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2388 memset(&p, 0, sizeof(p));
2389 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2393 p.iph.protocol = IPPROTO_IPV6;
2395 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2397 if (ops->ndo_do_ioctl) {
2398 mm_segment_t oldfs = get_fs();
2401 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2408 dev = __dev_get_by_name(net, p.name);
2411 err = dev_open(dev);
2422 * Manual configuration of address on an interface
2424 static int inet6_addr_add(struct net *net, int ifindex,
2425 const struct in6_addr *pfx,
2426 const struct in6_addr *peer_pfx,
2427 unsigned int plen, __u32 ifa_flags,
2428 __u32 prefered_lft, __u32 valid_lft)
2430 struct inet6_ifaddr *ifp;
2431 struct inet6_dev *idev;
2432 struct net_device *dev;
2436 unsigned long timeout;
2443 /* check the lifetime */
2444 if (!valid_lft || prefered_lft > valid_lft)
2447 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2450 dev = __dev_get_by_index(net, ifindex);
2454 idev = addrconf_add_dev(dev);
2456 return PTR_ERR(idev);
2458 scope = ipv6_addr_scope(pfx);
2460 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2461 if (addrconf_finite_timeout(timeout)) {
2462 expires = jiffies_to_clock_t(timeout * HZ);
2463 valid_lft = timeout;
2464 flags = RTF_EXPIRES;
2468 ifa_flags |= IFA_F_PERMANENT;
2471 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2472 if (addrconf_finite_timeout(timeout)) {
2474 ifa_flags |= IFA_F_DEPRECATED;
2475 prefered_lft = timeout;
2478 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2479 valid_lft, prefered_lft);
2482 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2483 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2488 * Note that section 3.1 of RFC 4429 indicates
2489 * that the Optimistic flag should not be set for
2490 * manually configured addresses
2492 addrconf_dad_start(ifp);
2493 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2494 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2497 addrconf_verify_rtnl();
2501 return PTR_ERR(ifp);
2504 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2505 const struct in6_addr *pfx, unsigned int plen)
2507 struct inet6_ifaddr *ifp;
2508 struct inet6_dev *idev;
2509 struct net_device *dev;
2514 dev = __dev_get_by_index(net, ifindex);
2518 if ((idev = __in6_dev_get(dev)) == NULL)
2521 read_lock_bh(&idev->lock);
2522 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2523 if (ifp->prefix_len == plen &&
2524 ipv6_addr_equal(pfx, &ifp->addr)) {
2526 read_unlock_bh(&idev->lock);
2528 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2529 (ifa_flags & IFA_F_MANAGETEMPADDR))
2530 manage_tempaddrs(idev, ifp, 0, 0, false,
2533 addrconf_verify_rtnl();
2537 read_unlock_bh(&idev->lock);
2538 return -EADDRNOTAVAIL;
2542 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2544 struct in6_ifreq ireq;
2547 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2550 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2554 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2555 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2556 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2561 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2563 struct in6_ifreq ireq;
2566 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2569 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2573 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
2574 ireq.ifr6_prefixlen);
2579 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2580 int plen, int scope)
2582 struct inet6_ifaddr *ifp;
2584 ifp = ipv6_add_addr(idev, addr, NULL, plen,
2585 scope, IFA_F_PERMANENT,
2586 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2588 spin_lock_bh(&ifp->lock);
2589 ifp->flags &= ~IFA_F_TENTATIVE;
2590 spin_unlock_bh(&ifp->lock);
2591 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2596 #if IS_ENABLED(CONFIG_IPV6_SIT)
2597 static void sit_add_v4_addrs(struct inet6_dev *idev)
2599 struct in6_addr addr;
2600 struct net_device *dev;
2601 struct net *net = dev_net(idev->dev);
2607 memset(&addr, 0, sizeof(struct in6_addr));
2608 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2610 if (idev->dev->flags&IFF_POINTOPOINT) {
2611 addr.s6_addr32[0] = htonl(0xfe800000);
2615 scope = IPV6_ADDR_COMPATv4;
2617 pflags |= RTF_NONEXTHOP;
2620 if (addr.s6_addr32[3]) {
2621 add_addr(idev, &addr, plen, scope);
2622 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
2626 for_each_netdev(net, dev) {
2627 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2628 if (in_dev && (dev->flags & IFF_UP)) {
2629 struct in_ifaddr *ifa;
2633 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2635 addr.s6_addr32[3] = ifa->ifa_local;
2637 if (ifa->ifa_scope == RT_SCOPE_LINK)
2639 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2640 if (idev->dev->flags&IFF_POINTOPOINT)
2645 add_addr(idev, &addr, plen, flag);
2646 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2654 static void init_loopback(struct net_device *dev)
2656 struct inet6_dev *idev;
2657 struct net_device *sp_dev;
2658 struct inet6_ifaddr *sp_ifa;
2659 struct rt6_info *sp_rt;
2665 if ((idev = ipv6_find_idev(dev)) == NULL) {
2666 pr_debug("%s: add_dev failed\n", __func__);
2670 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2672 /* Add routes to other interface's IPv6 addresses */
2673 for_each_netdev(dev_net(dev), sp_dev) {
2674 if (!strcmp(sp_dev->name, dev->name))
2677 idev = __in6_dev_get(sp_dev);
2681 read_lock_bh(&idev->lock);
2682 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2684 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2688 /* This dst has been added to garbage list when
2689 * lo device down, release this obsolete dst and
2690 * reallocate a new router for ifa.
2692 if (sp_ifa->rt->dst.obsolete > 0) {
2693 ip6_rt_put(sp_ifa->rt);
2700 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
2702 /* Failure cases are ignored */
2703 if (!IS_ERR(sp_rt)) {
2708 read_unlock_bh(&idev->lock);
2712 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
2714 struct inet6_ifaddr *ifp;
2715 u32 addr_flags = IFA_F_PERMANENT;
2717 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2718 if (idev->cnf.optimistic_dad &&
2719 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2720 addr_flags |= IFA_F_OPTIMISTIC;
2724 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
2725 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2727 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2728 addrconf_dad_start(ifp);
2733 static void addrconf_dev_config(struct net_device *dev)
2735 struct in6_addr addr;
2736 struct inet6_dev *idev;
2740 if ((dev->type != ARPHRD_ETHER) &&
2741 (dev->type != ARPHRD_FDDI) &&
2742 (dev->type != ARPHRD_ARCNET) &&
2743 (dev->type != ARPHRD_INFINIBAND) &&
2744 (dev->type != ARPHRD_IEEE802154) &&
2745 (dev->type != ARPHRD_IEEE1394) &&
2746 (dev->type != ARPHRD_TUNNEL6) &&
2747 (dev->type != ARPHRD_6LOWPAN)) {
2748 /* Alas, we support only Ethernet autoconfiguration. */
2752 idev = addrconf_add_dev(dev);
2756 memset(&addr, 0, sizeof(struct in6_addr));
2757 addr.s6_addr32[0] = htonl(0xFE800000);
2759 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2760 addrconf_add_linklocal(idev, &addr);
2763 #if IS_ENABLED(CONFIG_IPV6_SIT)
2764 static void addrconf_sit_config(struct net_device *dev)
2766 struct inet6_dev *idev;
2771 * Configure the tunnel with one of our IPv4
2772 * addresses... we should configure all of
2773 * our v4 addrs in the tunnel
2776 if ((idev = ipv6_find_idev(dev)) == NULL) {
2777 pr_debug("%s: add_dev failed\n", __func__);
2781 if (dev->priv_flags & IFF_ISATAP) {
2782 struct in6_addr addr;
2784 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2785 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2786 addrconf_add_linklocal(idev, &addr);
2790 sit_add_v4_addrs(idev);
2792 if (dev->flags&IFF_POINTOPOINT)
2793 addrconf_add_mroute(dev);
2797 #if IS_ENABLED(CONFIG_NET_IPGRE)
2798 static void addrconf_gre_config(struct net_device *dev)
2800 struct inet6_dev *idev;
2801 struct in6_addr addr;
2805 if ((idev = ipv6_find_idev(dev)) == NULL) {
2806 pr_debug("%s: add_dev failed\n", __func__);
2810 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2811 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2812 addrconf_add_linklocal(idev, &addr);
2814 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2818 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2821 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2822 struct inet6_dev *idev = __in6_dev_get(dev);
2823 int run_pending = 0;
2827 case NETDEV_REGISTER:
2828 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2829 idev = ipv6_add_dev(dev);
2831 return notifier_from_errno(-ENOMEM);
2837 if (dev->flags & IFF_SLAVE)
2840 if (event == NETDEV_UP) {
2841 if (!addrconf_qdisc_ok(dev)) {
2842 /* device is not ready yet. */
2843 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
2848 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2849 idev = ipv6_add_dev(dev);
2852 idev->if_flags |= IF_READY;
2856 if (!addrconf_qdisc_ok(dev)) {
2857 /* device is still not ready. */
2862 if (idev->if_flags & IF_READY)
2863 /* device is already configured. */
2865 idev->if_flags |= IF_READY;
2868 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
2874 switch (dev->type) {
2875 #if IS_ENABLED(CONFIG_IPV6_SIT)
2877 addrconf_sit_config(dev);
2880 #if IS_ENABLED(CONFIG_NET_IPGRE)
2882 addrconf_gre_config(dev);
2885 case ARPHRD_LOOPBACK:
2890 addrconf_dev_config(dev);
2896 addrconf_dad_run(idev);
2899 * If the MTU changed during the interface down,
2900 * when the interface up, the changed MTU must be
2901 * reflected in the idev as well as routers.
2903 if (idev->cnf.mtu6 != dev->mtu &&
2904 dev->mtu >= IPV6_MIN_MTU) {
2905 rt6_mtu_change(dev, dev->mtu);
2906 idev->cnf.mtu6 = dev->mtu;
2908 idev->tstamp = jiffies;
2909 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2912 * If the changed mtu during down is lower than
2913 * IPV6_MIN_MTU stop IPv6 on this interface.
2915 if (dev->mtu < IPV6_MIN_MTU)
2916 addrconf_ifdown(dev, 1);
2920 case NETDEV_CHANGEMTU:
2921 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2922 rt6_mtu_change(dev, dev->mtu);
2923 idev->cnf.mtu6 = dev->mtu;
2927 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2928 idev = ipv6_add_dev(dev);
2934 * if MTU under IPV6_MIN_MTU.
2935 * Stop IPv6 on this interface.
2939 case NETDEV_UNREGISTER:
2941 * Remove all addresses from this interface.
2943 addrconf_ifdown(dev, event != NETDEV_DOWN);
2946 case NETDEV_CHANGENAME:
2948 snmp6_unregister_dev(idev);
2949 addrconf_sysctl_unregister(idev);
2950 addrconf_sysctl_register(idev);
2951 err = snmp6_register_dev(idev);
2953 return notifier_from_errno(err);
2957 case NETDEV_PRE_TYPE_CHANGE:
2958 case NETDEV_POST_TYPE_CHANGE:
2959 addrconf_type_change(dev, event);
2967 * addrconf module should be notified of a device going up
2969 static struct notifier_block ipv6_dev_notf = {
2970 .notifier_call = addrconf_notify,
2973 static void addrconf_type_change(struct net_device *dev, unsigned long event)
2975 struct inet6_dev *idev;
2978 idev = __in6_dev_get(dev);
2980 if (event == NETDEV_POST_TYPE_CHANGE)
2981 ipv6_mc_remap(idev);
2982 else if (event == NETDEV_PRE_TYPE_CHANGE)
2983 ipv6_mc_unmap(idev);
2986 static int addrconf_ifdown(struct net_device *dev, int how)
2988 struct net *net = dev_net(dev);
2989 struct inet6_dev *idev;
2990 struct inet6_ifaddr *ifa;
2995 rt6_ifdown(net, dev);
2996 neigh_ifdown(&nd_tbl, dev);
2998 idev = __in6_dev_get(dev);
3003 * Step 1: remove reference to ipv6 device from parent device.
3009 /* protected by rtnl_lock */
3010 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3012 /* Step 1.5: remove snmp6 entry */
3013 snmp6_unregister_dev(idev);
3017 /* Step 2: clear hash table */
3018 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3019 struct hlist_head *h = &inet6_addr_lst[i];
3021 spin_lock_bh(&addrconf_hash_lock);
3023 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3024 if (ifa->idev == idev) {
3025 hlist_del_init_rcu(&ifa->addr_lst);
3026 addrconf_del_dad_work(ifa);
3030 spin_unlock_bh(&addrconf_hash_lock);
3033 write_lock_bh(&idev->lock);
3035 addrconf_del_rs_timer(idev);
3037 /* Step 2: clear flags for stateless addrconf */
3039 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3041 if (how && del_timer(&idev->regen_timer))
3044 /* Step 3: clear tempaddr list */
3045 while (!list_empty(&idev->tempaddr_list)) {
3046 ifa = list_first_entry(&idev->tempaddr_list,
3047 struct inet6_ifaddr, tmp_list);
3048 list_del(&ifa->tmp_list);
3049 write_unlock_bh(&idev->lock);
3050 spin_lock_bh(&ifa->lock);
3053 in6_ifa_put(ifa->ifpub);
3056 spin_unlock_bh(&ifa->lock);
3058 write_lock_bh(&idev->lock);
3061 while (!list_empty(&idev->addr_list)) {
3062 ifa = list_first_entry(&idev->addr_list,
3063 struct inet6_ifaddr, if_list);
3064 addrconf_del_dad_work(ifa);
3066 list_del(&ifa->if_list);
3068 write_unlock_bh(&idev->lock);
3070 spin_lock_bh(&ifa->state_lock);
3072 ifa->state = INET6_IFADDR_STATE_DEAD;
3073 spin_unlock_bh(&ifa->state_lock);
3075 if (state != INET6_IFADDR_STATE_DEAD) {
3076 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3077 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3081 write_lock_bh(&idev->lock);
3084 write_unlock_bh(&idev->lock);
3086 /* Step 5: Discard multicast list */
3088 ipv6_mc_destroy_dev(idev);
3092 idev->tstamp = jiffies;
3094 /* Last: Shot the device (if unregistered) */
3096 addrconf_sysctl_unregister(idev);
3097 neigh_parms_release(&nd_tbl, idev->nd_parms);
3098 neigh_ifdown(&nd_tbl, dev);
3104 static void addrconf_rs_timer(unsigned long data)
3106 struct inet6_dev *idev = (struct inet6_dev *)data;
3107 struct net_device *dev = idev->dev;
3108 struct in6_addr lladdr;
3110 write_lock(&idev->lock);
3111 if (idev->dead || !(idev->if_flags & IF_READY))
3114 if (!ipv6_accept_ra(idev))
3117 /* Announcement received after solicitation was sent */
3118 if (idev->if_flags & IF_RA_RCVD)
3121 if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
3122 write_unlock(&idev->lock);
3123 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3124 ndisc_send_rs(dev, &lladdr,
3125 &in6addr_linklocal_allrouters);
3129 write_lock(&idev->lock);
3130 /* The wait after the last probe can be shorter */
3131 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3132 idev->cnf.rtr_solicits) ?
3133 idev->cnf.rtr_solicit_delay :
3134 idev->cnf.rtr_solicit_interval);
3137 * Note: we do not support deprecated "all on-link"
3138 * assumption any longer.
3140 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3144 write_unlock(&idev->lock);
3150 * Duplicate Address Detection
3152 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3154 unsigned long rand_num;
3155 struct inet6_dev *idev = ifp->idev;
3157 if (ifp->flags & IFA_F_OPTIMISTIC)
3160 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3162 ifp->dad_probes = idev->cnf.dad_transmits;
3163 addrconf_mod_dad_work(ifp, rand_num);
3166 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3168 struct inet6_dev *idev = ifp->idev;
3169 struct net_device *dev = idev->dev;
3171 addrconf_join_solict(dev, &ifp->addr);
3173 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3175 read_lock_bh(&idev->lock);
3176 spin_lock(&ifp->lock);
3177 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3180 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3181 idev->cnf.accept_dad < 1 ||
3182 !(ifp->flags&IFA_F_TENTATIVE) ||
3183 ifp->flags & IFA_F_NODAD) {
3184 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3185 spin_unlock(&ifp->lock);
3186 read_unlock_bh(&idev->lock);
3188 addrconf_dad_completed(ifp);
3192 if (!(idev->if_flags & IF_READY)) {
3193 spin_unlock(&ifp->lock);
3194 read_unlock_bh(&idev->lock);
3196 * If the device is not ready:
3197 * - keep it tentative if it is a permanent address.
3198 * - otherwise, kill it.
3201 addrconf_dad_stop(ifp, 0);
3206 * Optimistic nodes can start receiving
3209 if (ifp->flags & IFA_F_OPTIMISTIC)
3210 ip6_ins_rt(ifp->rt);
3212 addrconf_dad_kick(ifp);
3214 spin_unlock(&ifp->lock);
3215 read_unlock_bh(&idev->lock);
3218 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3220 bool begin_dad = false;
3222 spin_lock_bh(&ifp->state_lock);
3223 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3224 ifp->state = INET6_IFADDR_STATE_PREDAD;
3227 spin_unlock_bh(&ifp->state_lock);
3230 addrconf_mod_dad_work(ifp, 0);
3233 static void addrconf_dad_work(struct work_struct *w)
3235 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3236 struct inet6_ifaddr,
3238 struct inet6_dev *idev = ifp->idev;
3239 struct in6_addr mcaddr;
3245 } action = DAD_PROCESS;
3249 spin_lock_bh(&ifp->state_lock);
3250 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3252 ifp->state = INET6_IFADDR_STATE_DAD;
3253 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3255 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3257 spin_unlock_bh(&ifp->state_lock);
3259 if (action == DAD_BEGIN) {
3260 addrconf_dad_begin(ifp);
3262 } else if (action == DAD_ABORT) {
3263 addrconf_dad_stop(ifp, 1);
3267 if (!ifp->dad_probes && addrconf_dad_end(ifp))
3270 write_lock_bh(&idev->lock);
3271 if (idev->dead || !(idev->if_flags & IF_READY)) {
3272 write_unlock_bh(&idev->lock);
3276 spin_lock(&ifp->lock);
3277 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3278 spin_unlock(&ifp->lock);
3279 write_unlock_bh(&idev->lock);
3283 if (ifp->dad_probes == 0) {
3285 * DAD was successful
3288 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3289 spin_unlock(&ifp->lock);
3290 write_unlock_bh(&idev->lock);
3292 addrconf_dad_completed(ifp);
3298 addrconf_mod_dad_work(ifp,
3299 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
3300 spin_unlock(&ifp->lock);
3301 write_unlock_bh(&idev->lock);
3303 /* send a neighbour solicitation for our addr */
3304 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3305 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
3311 /* ifp->idev must be at least read locked */
3312 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3314 struct inet6_ifaddr *ifpiter;
3315 struct inet6_dev *idev = ifp->idev;
3317 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3318 if (ifpiter->scope > IFA_LINK)
3320 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3321 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3322 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3329 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3331 struct net_device *dev = ifp->idev->dev;
3332 struct in6_addr lladdr;
3333 bool send_rs, send_mld;
3335 addrconf_del_dad_work(ifp);
3338 * Configure the address for reception. Now it is valid.
3341 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3343 /* If added prefix is link local and we are prepared to process
3344 router advertisements, start sending router solicitations.
3347 read_lock_bh(&ifp->idev->lock);
3348 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
3349 send_rs = send_mld &&
3350 ipv6_accept_ra(ifp->idev) &&
3351 ifp->idev->cnf.rtr_solicits > 0 &&
3352 (dev->flags&IFF_LOOPBACK) == 0;
3353 read_unlock_bh(&ifp->idev->lock);
3355 /* While dad is in progress mld report's source address is in6_addrany.
3356 * Resend with proper ll now.
3359 ipv6_mc_dad_complete(ifp->idev);
3363 * If a host as already performed a random delay
3364 * [...] as part of DAD [...] there is no need
3365 * to delay again before sending the first RS
3367 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3369 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
3371 write_lock_bh(&ifp->idev->lock);
3372 spin_lock(&ifp->lock);
3373 ifp->idev->rs_probes = 1;
3374 ifp->idev->if_flags |= IF_RS_SENT;
3375 addrconf_mod_rs_timer(ifp->idev,
3376 ifp->idev->cnf.rtr_solicit_interval);
3377 spin_unlock(&ifp->lock);
3378 write_unlock_bh(&ifp->idev->lock);
3382 static void addrconf_dad_run(struct inet6_dev *idev)
3384 struct inet6_ifaddr *ifp;
3386 read_lock_bh(&idev->lock);
3387 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3388 spin_lock(&ifp->lock);
3389 if (ifp->flags & IFA_F_TENTATIVE &&
3390 ifp->state == INET6_IFADDR_STATE_DAD)
3391 addrconf_dad_kick(ifp);
3392 spin_unlock(&ifp->lock);
3394 read_unlock_bh(&idev->lock);
3397 #ifdef CONFIG_PROC_FS
3398 struct if6_iter_state {
3399 struct seq_net_private p;
3404 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3406 struct inet6_ifaddr *ifa = NULL;
3407 struct if6_iter_state *state = seq->private;
3408 struct net *net = seq_file_net(seq);
3411 /* initial bucket if pos is 0 */
3417 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3418 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
3420 if (!net_eq(dev_net(ifa->idev->dev), net))
3422 /* sync with offset */
3423 if (p < state->offset) {
3431 /* prepare for next bucket */
3438 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3439 struct inet6_ifaddr *ifa)
3441 struct if6_iter_state *state = seq->private;
3442 struct net *net = seq_file_net(seq);
3444 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
3445 if (!net_eq(dev_net(ifa->idev->dev), net))
3451 while (++state->bucket < IN6_ADDR_HSIZE) {
3453 hlist_for_each_entry_rcu_bh(ifa,
3454 &inet6_addr_lst[state->bucket], addr_lst) {
3455 if (!net_eq(dev_net(ifa->idev->dev), net))
3465 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3469 return if6_get_first(seq, *pos);
3472 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3474 struct inet6_ifaddr *ifa;
3476 ifa = if6_get_next(seq, v);
3481 static void if6_seq_stop(struct seq_file *seq, void *v)
3484 rcu_read_unlock_bh();
3487 static int if6_seq_show(struct seq_file *seq, void *v)
3489 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3490 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3492 ifp->idev->dev->ifindex,
3496 ifp->idev->dev->name);
3500 static const struct seq_operations if6_seq_ops = {
3501 .start = if6_seq_start,
3502 .next = if6_seq_next,
3503 .show = if6_seq_show,
3504 .stop = if6_seq_stop,
3507 static int if6_seq_open(struct inode *inode, struct file *file)
3509 return seq_open_net(inode, file, &if6_seq_ops,
3510 sizeof(struct if6_iter_state));
3513 static const struct file_operations if6_fops = {
3514 .owner = THIS_MODULE,
3515 .open = if6_seq_open,
3517 .llseek = seq_lseek,
3518 .release = seq_release_net,
3521 static int __net_init if6_proc_net_init(struct net *net)
3523 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
3528 static void __net_exit if6_proc_net_exit(struct net *net)
3530 remove_proc_entry("if_inet6", net->proc_net);
3533 static struct pernet_operations if6_proc_net_ops = {
3534 .init = if6_proc_net_init,
3535 .exit = if6_proc_net_exit,
3538 int __init if6_proc_init(void)
3540 return register_pernet_subsys(&if6_proc_net_ops);
3543 void if6_proc_exit(void)
3545 unregister_pernet_subsys(&if6_proc_net_ops);
3547 #endif /* CONFIG_PROC_FS */
3549 #if IS_ENABLED(CONFIG_IPV6_MIP6)
3550 /* Check if address is a home address configured on any interface. */
3551 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3554 struct inet6_ifaddr *ifp = NULL;
3555 unsigned int hash = inet6_addr_hash(addr);
3558 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
3559 if (!net_eq(dev_net(ifp->idev->dev), net))
3561 if (ipv6_addr_equal(&ifp->addr, addr) &&
3562 (ifp->flags & IFA_F_HOMEADDRESS)) {
3567 rcu_read_unlock_bh();
3573 * Periodic address status verification
3576 static void addrconf_verify_rtnl(void)
3578 unsigned long now, next, next_sec, next_sched;
3579 struct inet6_ifaddr *ifp;
3586 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3588 cancel_delayed_work(&addr_chk_work);
3590 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3592 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
3595 /* When setting preferred_lft to a value not zero or
3596 * infinity, while valid_lft is infinity
3597 * IFA_F_PERMANENT has a non-infinity life time.
3599 if ((ifp->flags & IFA_F_PERMANENT) &&
3600 (ifp->prefered_lft == INFINITY_LIFE_TIME))
3603 spin_lock(&ifp->lock);
3604 /* We try to batch several events at once. */
3605 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3607 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3608 age >= ifp->valid_lft) {
3609 spin_unlock(&ifp->lock);
3613 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3614 spin_unlock(&ifp->lock);
3616 } else if (age >= ifp->prefered_lft) {
3617 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3620 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3622 ifp->flags |= IFA_F_DEPRECATED;
3625 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
3626 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
3627 next = ifp->tstamp + ifp->valid_lft * HZ;
3629 spin_unlock(&ifp->lock);
3634 ipv6_ifa_notify(0, ifp);
3638 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3639 !(ifp->flags&IFA_F_TENTATIVE)) {
3640 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3641 ifp->idev->cnf.dad_transmits *
3642 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
3644 if (age >= ifp->prefered_lft - regen_advance) {
3645 struct inet6_ifaddr *ifpub = ifp->ifpub;
3646 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3647 next = ifp->tstamp + ifp->prefered_lft * HZ;
3648 if (!ifp->regen_count && ifpub) {
3651 in6_ifa_hold(ifpub);
3652 spin_unlock(&ifp->lock);
3654 spin_lock(&ifpub->lock);
3655 ifpub->regen_count = 0;
3656 spin_unlock(&ifpub->lock);
3657 ipv6_create_tempaddr(ifpub, ifp);
3662 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3663 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3664 spin_unlock(&ifp->lock);
3666 /* ifp->prefered_lft <= ifp->valid_lft */
3667 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3668 next = ifp->tstamp + ifp->prefered_lft * HZ;
3669 spin_unlock(&ifp->lock);
3674 next_sec = round_jiffies_up(next);
3677 /* If rounded timeout is accurate enough, accept it. */
3678 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3679 next_sched = next_sec;
3681 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3682 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3683 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3685 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3686 now, next, next_sec, next_sched);
3687 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
3688 rcu_read_unlock_bh();
3691 static void addrconf_verify_work(struct work_struct *w)
3694 addrconf_verify_rtnl();
3698 static void addrconf_verify(void)
3700 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
3703 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
3704 struct in6_addr **peer_pfx)
3706 struct in6_addr *pfx = NULL;
3711 pfx = nla_data(addr);
3714 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3716 pfx = nla_data(local);
3722 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3723 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3724 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3725 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3726 [IFA_FLAGS] = { .len = sizeof(u32) },
3730 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
3732 struct net *net = sock_net(skb->sk);
3733 struct ifaddrmsg *ifm;
3734 struct nlattr *tb[IFA_MAX+1];
3735 struct in6_addr *pfx, *peer_pfx;
3739 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3743 ifm = nlmsg_data(nlh);
3744 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
3748 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
3750 /* We ignore other flags so far. */
3751 ifa_flags &= IFA_F_MANAGETEMPADDR;
3753 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
3754 ifm->ifa_prefixlen);
3757 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
3758 u32 prefered_lft, u32 valid_lft)
3762 unsigned long timeout;
3763 bool was_managetempaddr;
3764 bool had_prefixroute;
3768 if (!valid_lft || (prefered_lft > valid_lft))
3771 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
3772 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
3775 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3776 if (addrconf_finite_timeout(timeout)) {
3777 expires = jiffies_to_clock_t(timeout * HZ);
3778 valid_lft = timeout;
3779 flags = RTF_EXPIRES;
3783 ifa_flags |= IFA_F_PERMANENT;
3786 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3787 if (addrconf_finite_timeout(timeout)) {
3789 ifa_flags |= IFA_F_DEPRECATED;
3790 prefered_lft = timeout;
3793 spin_lock_bh(&ifp->lock);
3794 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
3795 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
3796 !(ifp->flags & IFA_F_NOPREFIXROUTE);
3797 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
3798 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
3799 IFA_F_NOPREFIXROUTE);
3800 ifp->flags |= ifa_flags;
3801 ifp->tstamp = jiffies;
3802 ifp->valid_lft = valid_lft;
3803 ifp->prefered_lft = prefered_lft;
3805 spin_unlock_bh(&ifp->lock);
3806 if (!(ifp->flags&IFA_F_TENTATIVE))
3807 ipv6_ifa_notify(0, ifp);
3809 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
3810 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3812 } else if (had_prefixroute) {
3813 enum cleanup_prefix_rt_t action;
3814 unsigned long rt_expires;
3816 write_lock_bh(&ifp->idev->lock);
3817 action = check_cleanup_prefix_route(ifp, &rt_expires);
3818 write_unlock_bh(&ifp->idev->lock);
3820 if (action != CLEANUP_PREFIX_RT_NOP) {
3821 cleanup_prefix_route(ifp, rt_expires,
3822 action == CLEANUP_PREFIX_RT_DEL);
3826 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
3827 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
3828 valid_lft = prefered_lft = 0;
3829 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
3830 !was_managetempaddr, jiffies);
3833 addrconf_verify_rtnl();
3839 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
3841 struct net *net = sock_net(skb->sk);
3842 struct ifaddrmsg *ifm;
3843 struct nlattr *tb[IFA_MAX+1];
3844 struct in6_addr *pfx, *peer_pfx;
3845 struct inet6_ifaddr *ifa;
3846 struct net_device *dev;
3847 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3851 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3855 ifm = nlmsg_data(nlh);
3856 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
3860 if (tb[IFA_CACHEINFO]) {
3861 struct ifa_cacheinfo *ci;
3863 ci = nla_data(tb[IFA_CACHEINFO]);
3864 valid_lft = ci->ifa_valid;
3865 preferred_lft = ci->ifa_prefered;
3867 preferred_lft = INFINITY_LIFE_TIME;
3868 valid_lft = INFINITY_LIFE_TIME;
3871 dev = __dev_get_by_index(net, ifm->ifa_index);
3875 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
3877 /* We ignore other flags so far. */
3878 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
3879 IFA_F_NOPREFIXROUTE;
3881 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3884 * It would be best to check for !NLM_F_CREATE here but
3885 * userspace already relies on not having to provide this.
3887 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
3888 ifm->ifa_prefixlen, ifa_flags,
3889 preferred_lft, valid_lft);
3892 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3893 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3896 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3903 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
3904 u8 scope, int ifindex)
3906 struct ifaddrmsg *ifm;
3908 ifm = nlmsg_data(nlh);
3909 ifm->ifa_family = AF_INET6;
3910 ifm->ifa_prefixlen = prefixlen;
3911 ifm->ifa_flags = flags;
3912 ifm->ifa_scope = scope;
3913 ifm->ifa_index = ifindex;
3916 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3917 unsigned long tstamp, u32 preferred, u32 valid)
3919 struct ifa_cacheinfo ci;
3921 ci.cstamp = cstamp_delta(cstamp);
3922 ci.tstamp = cstamp_delta(tstamp);
3923 ci.ifa_prefered = preferred;
3924 ci.ifa_valid = valid;
3926 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3929 static inline int rt_scope(int ifa_scope)
3931 if (ifa_scope & IFA_HOST)
3932 return RT_SCOPE_HOST;
3933 else if (ifa_scope & IFA_LINK)
3934 return RT_SCOPE_LINK;
3935 else if (ifa_scope & IFA_SITE)
3936 return RT_SCOPE_SITE;
3938 return RT_SCOPE_UNIVERSE;
3941 static inline int inet6_ifaddr_msgsize(void)
3943 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3944 + nla_total_size(16) /* IFA_LOCAL */
3945 + nla_total_size(16) /* IFA_ADDRESS */
3946 + nla_total_size(sizeof(struct ifa_cacheinfo))
3947 + nla_total_size(4) /* IFA_FLAGS */;
3950 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3951 u32 portid, u32 seq, int event, unsigned int flags)
3953 struct nlmsghdr *nlh;
3954 u32 preferred, valid;
3956 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3960 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3961 ifa->idev->dev->ifindex);
3963 if (!((ifa->flags&IFA_F_PERMANENT) &&
3964 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
3965 preferred = ifa->prefered_lft;
3966 valid = ifa->valid_lft;
3967 if (preferred != INFINITY_LIFE_TIME) {
3968 long tval = (jiffies - ifa->tstamp)/HZ;
3969 if (preferred > tval)
3973 if (valid != INFINITY_LIFE_TIME) {
3981 preferred = INFINITY_LIFE_TIME;
3982 valid = INFINITY_LIFE_TIME;
3985 if (!ipv6_addr_any(&ifa->peer_addr)) {
3986 if (nla_put(skb, IFA_LOCAL, 16, &ifa->addr) < 0 ||
3987 nla_put(skb, IFA_ADDRESS, 16, &ifa->peer_addr) < 0)
3990 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0)
3993 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
3996 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
3999 return nlmsg_end(skb, nlh);
4002 nlmsg_cancel(skb, nlh);
4006 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
4007 u32 portid, u32 seq, int event, u16 flags)
4009 struct nlmsghdr *nlh;
4010 u8 scope = RT_SCOPE_UNIVERSE;
4011 int ifindex = ifmca->idev->dev->ifindex;
4013 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4014 scope = RT_SCOPE_SITE;
4016 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4020 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4021 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
4022 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
4023 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4024 nlmsg_cancel(skb, nlh);
4028 return nlmsg_end(skb, nlh);
4031 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
4032 u32 portid, u32 seq, int event, unsigned int flags)
4034 struct nlmsghdr *nlh;
4035 u8 scope = RT_SCOPE_UNIVERSE;
4036 int ifindex = ifaca->aca_idev->dev->ifindex;
4038 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4039 scope = RT_SCOPE_SITE;
4041 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4045 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4046 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
4047 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
4048 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4049 nlmsg_cancel(skb, nlh);
4053 return nlmsg_end(skb, nlh);
4062 /* called with rcu_read_lock() */
4063 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4064 struct netlink_callback *cb, enum addr_type_t type,
4065 int s_ip_idx, int *p_ip_idx)
4067 struct ifmcaddr6 *ifmca;
4068 struct ifacaddr6 *ifaca;
4070 int ip_idx = *p_ip_idx;
4072 read_lock_bh(&idev->lock);
4074 case UNICAST_ADDR: {
4075 struct inet6_ifaddr *ifa;
4077 /* unicast address incl. temp addr */
4078 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4079 if (++ip_idx < s_ip_idx)
4081 err = inet6_fill_ifaddr(skb, ifa,
4082 NETLINK_CB(cb->skb).portid,
4088 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4092 case MULTICAST_ADDR:
4093 /* multicast address */
4094 for (ifmca = idev->mc_list; ifmca;
4095 ifmca = ifmca->next, ip_idx++) {
4096 if (ip_idx < s_ip_idx)
4098 err = inet6_fill_ifmcaddr(skb, ifmca,
4099 NETLINK_CB(cb->skb).portid,
4108 /* anycast address */
4109 for (ifaca = idev->ac_list; ifaca;
4110 ifaca = ifaca->aca_next, ip_idx++) {
4111 if (ip_idx < s_ip_idx)
4113 err = inet6_fill_ifacaddr(skb, ifaca,
4114 NETLINK_CB(cb->skb).portid,
4125 read_unlock_bh(&idev->lock);
4130 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4131 enum addr_type_t type)
4133 struct net *net = sock_net(skb->sk);
4136 int s_idx, s_ip_idx;
4137 struct net_device *dev;
4138 struct inet6_dev *idev;
4139 struct hlist_head *head;
4142 s_idx = idx = cb->args[1];
4143 s_ip_idx = ip_idx = cb->args[2];
4146 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4147 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4149 head = &net->dev_index_head[h];
4150 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4153 if (h > s_h || idx > s_idx)
4156 idev = __in6_dev_get(dev);
4160 if (in6_dump_addrs(idev, skb, cb, type,
4161 s_ip_idx, &ip_idx) <= 0)
4171 cb->args[2] = ip_idx;
4176 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4178 enum addr_type_t type = UNICAST_ADDR;
4180 return inet6_dump_addr(skb, cb, type);
4183 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4185 enum addr_type_t type = MULTICAST_ADDR;
4187 return inet6_dump_addr(skb, cb, type);
4191 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4193 enum addr_type_t type = ANYCAST_ADDR;
4195 return inet6_dump_addr(skb, cb, type);
4198 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
4200 struct net *net = sock_net(in_skb->sk);
4201 struct ifaddrmsg *ifm;
4202 struct nlattr *tb[IFA_MAX+1];
4203 struct in6_addr *addr = NULL, *peer;
4204 struct net_device *dev = NULL;
4205 struct inet6_ifaddr *ifa;
4206 struct sk_buff *skb;
4209 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4213 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4219 ifm = nlmsg_data(nlh);
4221 dev = __dev_get_by_index(net, ifm->ifa_index);
4223 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4225 err = -EADDRNOTAVAIL;
4229 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4235 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4236 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4238 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4239 WARN_ON(err == -EMSGSIZE);
4243 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4250 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4252 struct sk_buff *skb;
4253 struct net *net = dev_net(ifa->idev->dev);
4256 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4260 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4262 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4263 WARN_ON(err == -EMSGSIZE);
4267 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4271 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4274 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4275 __s32 *array, int bytes)
4277 BUG_ON(bytes < (DEVCONF_MAX * 4));
4279 memset(array, 0, bytes);
4280 array[DEVCONF_FORWARDING] = cnf->forwarding;
4281 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4282 array[DEVCONF_MTU6] = cnf->mtu6;
4283 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4284 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4285 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4286 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4287 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4288 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4289 jiffies_to_msecs(cnf->rtr_solicit_interval);
4290 array[DEVCONF_RTR_SOLICIT_DELAY] =
4291 jiffies_to_msecs(cnf->rtr_solicit_delay);
4292 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4293 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4294 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4295 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4296 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
4297 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4298 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4299 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4300 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4301 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4302 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4303 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4304 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4305 #ifdef CONFIG_IPV6_ROUTER_PREF
4306 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4307 array[DEVCONF_RTR_PROBE_INTERVAL] =
4308 jiffies_to_msecs(cnf->rtr_probe_interval);
4309 #ifdef CONFIG_IPV6_ROUTE_INFO
4310 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4313 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4314 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4315 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4316 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4318 #ifdef CONFIG_IPV6_MROUTE
4319 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4321 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4322 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4323 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4324 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4325 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
4326 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
4329 static inline size_t inet6_ifla6_size(void)
4331 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4332 + nla_total_size(sizeof(struct ifla_cacheinfo))
4333 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4334 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4335 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4336 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
4339 static inline size_t inet6_if_nlmsg_size(void)
4341 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4342 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4343 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4344 + nla_total_size(4) /* IFLA_MTU */
4345 + nla_total_size(4) /* IFLA_LINK */
4346 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4349 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4350 int items, int bytes)
4353 int pad = bytes - sizeof(u64) * items;
4356 /* Use put_unaligned() because stats may not be aligned for u64. */
4357 put_unaligned(items, &stats[0]);
4358 for (i = 1; i < items; i++)
4359 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4361 memset(&stats[items], 0, pad);
4364 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
4365 int items, int bytes, size_t syncpoff)
4368 int pad = bytes - sizeof(u64) * items;
4371 /* Use put_unaligned() because stats may not be aligned for u64. */
4372 put_unaligned(items, &stats[0]);
4373 for (i = 1; i < items; i++)
4374 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4376 memset(&stats[items], 0, pad);
4379 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4383 case IFLA_INET6_STATS:
4384 __snmp6_fill_stats64(stats, idev->stats.ipv6,
4385 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
4387 case IFLA_INET6_ICMP6STATS:
4388 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
4393 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4396 struct ifla_cacheinfo ci;
4398 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4399 goto nla_put_failure;
4400 ci.max_reasm_len = IPV6_MAXPLEN;
4401 ci.tstamp = cstamp_delta(idev->tstamp);
4402 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4403 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
4404 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4405 goto nla_put_failure;
4406 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4408 goto nla_put_failure;
4409 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4411 /* XXX - MC not implemented */
4413 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4415 goto nla_put_failure;
4416 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4418 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4420 goto nla_put_failure;
4421 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4423 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4425 goto nla_put_failure;
4426 read_lock_bh(&idev->lock);
4427 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4428 read_unlock_bh(&idev->lock);
4436 static size_t inet6_get_link_af_size(const struct net_device *dev)
4438 if (!__in6_dev_get(dev))
4441 return inet6_ifla6_size();
4444 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4446 struct inet6_dev *idev = __in6_dev_get(dev);
4451 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4457 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4459 struct inet6_ifaddr *ifp;
4460 struct net_device *dev = idev->dev;
4461 bool update_rs = false;
4462 struct in6_addr ll_addr;
4468 if (ipv6_addr_any(token))
4470 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4472 if (!ipv6_accept_ra(idev))
4474 if (idev->cnf.rtr_solicits <= 0)
4477 write_lock_bh(&idev->lock);
4479 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4480 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4482 write_unlock_bh(&idev->lock);
4484 if (!idev->dead && (idev->if_flags & IF_READY) &&
4485 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4486 IFA_F_OPTIMISTIC)) {
4488 /* If we're not ready, then normal ifup will take care
4489 * of this. Otherwise, we need to request our rs here.
4491 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4495 write_lock_bh(&idev->lock);
4498 idev->if_flags |= IF_RS_SENT;
4499 idev->rs_probes = 1;
4500 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
4503 /* Well, that's kinda nasty ... */
4504 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4505 spin_lock(&ifp->lock);
4506 if (ifp->tokenized) {
4508 ifp->prefered_lft = 0;
4510 spin_unlock(&ifp->lock);
4513 write_unlock_bh(&idev->lock);
4514 addrconf_verify_rtnl();
4518 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4521 struct inet6_dev *idev = __in6_dev_get(dev);
4522 struct nlattr *tb[IFLA_INET6_MAX + 1];
4525 return -EAFNOSUPPORT;
4527 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4530 if (tb[IFLA_INET6_TOKEN])
4531 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
4536 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4537 u32 portid, u32 seq, int event, unsigned int flags)
4539 struct net_device *dev = idev->dev;
4540 struct ifinfomsg *hdr;
4541 struct nlmsghdr *nlh;
4544 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
4548 hdr = nlmsg_data(nlh);
4549 hdr->ifi_family = AF_INET6;
4551 hdr->ifi_type = dev->type;
4552 hdr->ifi_index = dev->ifindex;
4553 hdr->ifi_flags = dev_get_flags(dev);
4554 hdr->ifi_change = 0;
4556 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4558 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4559 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4560 (dev->ifindex != dev->iflink &&
4561 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4562 goto nla_put_failure;
4563 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4564 if (protoinfo == NULL)
4565 goto nla_put_failure;
4567 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4568 goto nla_put_failure;
4570 nla_nest_end(skb, protoinfo);
4571 return nlmsg_end(skb, nlh);
4574 nlmsg_cancel(skb, nlh);
4578 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4580 struct net *net = sock_net(skb->sk);
4583 struct net_device *dev;
4584 struct inet6_dev *idev;
4585 struct hlist_head *head;
4588 s_idx = cb->args[1];
4591 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4593 head = &net->dev_index_head[h];
4594 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4597 idev = __in6_dev_get(dev);
4600 if (inet6_fill_ifinfo(skb, idev,
4601 NETLINK_CB(cb->skb).portid,
4603 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4617 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4619 struct sk_buff *skb;
4620 struct net *net = dev_net(idev->dev);
4623 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4627 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4629 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4630 WARN_ON(err == -EMSGSIZE);
4634 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4638 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4641 static inline size_t inet6_prefix_nlmsg_size(void)
4643 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4644 + nla_total_size(sizeof(struct in6_addr))
4645 + nla_total_size(sizeof(struct prefix_cacheinfo));
4648 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4649 struct prefix_info *pinfo, u32 portid, u32 seq,
4650 int event, unsigned int flags)
4652 struct prefixmsg *pmsg;
4653 struct nlmsghdr *nlh;
4654 struct prefix_cacheinfo ci;
4656 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
4660 pmsg = nlmsg_data(nlh);
4661 pmsg->prefix_family = AF_INET6;
4662 pmsg->prefix_pad1 = 0;
4663 pmsg->prefix_pad2 = 0;
4664 pmsg->prefix_ifindex = idev->dev->ifindex;
4665 pmsg->prefix_len = pinfo->prefix_len;
4666 pmsg->prefix_type = pinfo->type;
4667 pmsg->prefix_pad3 = 0;
4668 pmsg->prefix_flags = 0;
4670 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4671 if (pinfo->autoconf)
4672 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4674 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4675 goto nla_put_failure;
4676 ci.preferred_time = ntohl(pinfo->prefered);
4677 ci.valid_time = ntohl(pinfo->valid);
4678 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4679 goto nla_put_failure;
4680 return nlmsg_end(skb, nlh);
4683 nlmsg_cancel(skb, nlh);
4687 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4688 struct prefix_info *pinfo)
4690 struct sk_buff *skb;
4691 struct net *net = dev_net(idev->dev);
4694 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4698 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4700 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4701 WARN_ON(err == -EMSGSIZE);
4705 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4709 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4712 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4714 struct net *net = dev_net(ifp->idev->dev);
4719 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4724 * If the address was optimistic
4725 * we inserted the route at the start of
4726 * our DAD process, so we don't need
4729 if (!(ifp->rt->rt6i_node))
4730 ip6_ins_rt(ifp->rt);
4731 if (ifp->idev->cnf.forwarding)
4732 addrconf_join_anycast(ifp);
4733 if (!ipv6_addr_any(&ifp->peer_addr))
4734 addrconf_prefix_route(&ifp->peer_addr, 128,
4735 ifp->idev->dev, 0, 0);
4738 if (ifp->idev->cnf.forwarding)
4739 addrconf_leave_anycast(ifp);
4740 addrconf_leave_solict(ifp->idev, &ifp->addr);
4741 if (!ipv6_addr_any(&ifp->peer_addr)) {
4742 struct rt6_info *rt;
4743 struct net_device *dev = ifp->idev->dev;
4745 rt = rt6_lookup(dev_net(dev), &ifp->peer_addr, NULL,
4753 dst_hold(&ifp->rt->dst);
4755 if (ip6_del_rt(ifp->rt))
4756 dst_free(&ifp->rt->dst);
4759 atomic_inc(&net->ipv6.dev_addr_genid);
4760 rt_genid_bump_ipv6(net);
4763 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4766 if (likely(ifp->idev->dead == 0))
4767 __ipv6_ifa_notify(event, ifp);
4768 rcu_read_unlock_bh();
4771 #ifdef CONFIG_SYSCTL
4774 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
4775 void __user *buffer, size_t *lenp, loff_t *ppos)
4777 int *valp = ctl->data;
4780 struct ctl_table lctl;
4784 * ctl->data points to idev->cnf.forwarding, we should
4785 * not modify it until we get the rtnl lock.
4790 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4793 ret = addrconf_fixup_forwarding(ctl, valp, val);
4799 static void dev_disable_change(struct inet6_dev *idev)
4801 struct netdev_notifier_info info;
4803 if (!idev || !idev->dev)
4806 netdev_notifier_info_init(&info, idev->dev);
4807 if (idev->cnf.disable_ipv6)
4808 addrconf_notify(NULL, NETDEV_DOWN, &info);
4810 addrconf_notify(NULL, NETDEV_UP, &info);
4813 static void addrconf_disable_change(struct net *net, __s32 newf)
4815 struct net_device *dev;
4816 struct inet6_dev *idev;
4819 for_each_netdev_rcu(net, dev) {
4820 idev = __in6_dev_get(dev);
4822 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4823 idev->cnf.disable_ipv6 = newf;
4825 dev_disable_change(idev);
4831 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
4836 if (!rtnl_trylock())
4837 return restart_syscall();
4839 net = (struct net *)table->extra2;
4843 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4848 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4849 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4850 addrconf_disable_change(net, newf);
4851 } else if ((!newf) ^ (!old))
4852 dev_disable_change((struct inet6_dev *)table->extra1);
4859 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
4860 void __user *buffer, size_t *lenp, loff_t *ppos)
4862 int *valp = ctl->data;
4865 struct ctl_table lctl;
4869 * ctl->data points to idev->cnf.disable_ipv6, we should
4870 * not modify it until we get the rtnl lock.
4875 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4878 ret = addrconf_disable_ipv6(ctl, valp, val);
4885 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
4886 void __user *buffer, size_t *lenp, loff_t *ppos)
4888 int *valp = ctl->data;
4893 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4896 if (write && old != new) {
4897 struct net *net = ctl->extra2;
4899 if (!rtnl_trylock())
4900 return restart_syscall();
4902 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
4903 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
4904 NETCONFA_IFINDEX_DEFAULT,
4905 net->ipv6.devconf_dflt);
4906 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
4907 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
4908 NETCONFA_IFINDEX_ALL,
4909 net->ipv6.devconf_all);
4911 struct inet6_dev *idev = ctl->extra1;
4913 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
4924 static struct addrconf_sysctl_table
4926 struct ctl_table_header *sysctl_header;
4927 struct ctl_table addrconf_vars[DEVCONF_MAX+1];
4928 } addrconf_sysctl __read_mostly = {
4929 .sysctl_header = NULL,
4932 .procname = "forwarding",
4933 .data = &ipv6_devconf.forwarding,
4934 .maxlen = sizeof(int),
4936 .proc_handler = addrconf_sysctl_forward,
4939 .procname = "hop_limit",
4940 .data = &ipv6_devconf.hop_limit,
4941 .maxlen = sizeof(int),
4943 .proc_handler = proc_dointvec,
4947 .data = &ipv6_devconf.mtu6,
4948 .maxlen = sizeof(int),
4950 .proc_handler = proc_dointvec,
4953 .procname = "accept_ra",
4954 .data = &ipv6_devconf.accept_ra,
4955 .maxlen = sizeof(int),
4957 .proc_handler = proc_dointvec,
4960 .procname = "accept_redirects",
4961 .data = &ipv6_devconf.accept_redirects,
4962 .maxlen = sizeof(int),
4964 .proc_handler = proc_dointvec,
4967 .procname = "autoconf",
4968 .data = &ipv6_devconf.autoconf,
4969 .maxlen = sizeof(int),
4971 .proc_handler = proc_dointvec,
4974 .procname = "dad_transmits",
4975 .data = &ipv6_devconf.dad_transmits,
4976 .maxlen = sizeof(int),
4978 .proc_handler = proc_dointvec,
4981 .procname = "router_solicitations",
4982 .data = &ipv6_devconf.rtr_solicits,
4983 .maxlen = sizeof(int),
4985 .proc_handler = proc_dointvec,
4988 .procname = "router_solicitation_interval",
4989 .data = &ipv6_devconf.rtr_solicit_interval,
4990 .maxlen = sizeof(int),
4992 .proc_handler = proc_dointvec_jiffies,
4995 .procname = "router_solicitation_delay",
4996 .data = &ipv6_devconf.rtr_solicit_delay,
4997 .maxlen = sizeof(int),
4999 .proc_handler = proc_dointvec_jiffies,
5002 .procname = "force_mld_version",
5003 .data = &ipv6_devconf.force_mld_version,
5004 .maxlen = sizeof(int),
5006 .proc_handler = proc_dointvec,
5009 .procname = "mldv1_unsolicited_report_interval",
5011 &ipv6_devconf.mldv1_unsolicited_report_interval,
5012 .maxlen = sizeof(int),
5014 .proc_handler = proc_dointvec_ms_jiffies,
5017 .procname = "mldv2_unsolicited_report_interval",
5019 &ipv6_devconf.mldv2_unsolicited_report_interval,
5020 .maxlen = sizeof(int),
5022 .proc_handler = proc_dointvec_ms_jiffies,
5025 .procname = "use_tempaddr",
5026 .data = &ipv6_devconf.use_tempaddr,
5027 .maxlen = sizeof(int),
5029 .proc_handler = proc_dointvec,
5032 .procname = "temp_valid_lft",
5033 .data = &ipv6_devconf.temp_valid_lft,
5034 .maxlen = sizeof(int),
5036 .proc_handler = proc_dointvec,
5039 .procname = "temp_prefered_lft",
5040 .data = &ipv6_devconf.temp_prefered_lft,
5041 .maxlen = sizeof(int),
5043 .proc_handler = proc_dointvec,
5046 .procname = "regen_max_retry",
5047 .data = &ipv6_devconf.regen_max_retry,
5048 .maxlen = sizeof(int),
5050 .proc_handler = proc_dointvec,
5053 .procname = "max_desync_factor",
5054 .data = &ipv6_devconf.max_desync_factor,
5055 .maxlen = sizeof(int),
5057 .proc_handler = proc_dointvec,
5060 .procname = "max_addresses",
5061 .data = &ipv6_devconf.max_addresses,
5062 .maxlen = sizeof(int),
5064 .proc_handler = proc_dointvec,
5067 .procname = "accept_ra_defrtr",
5068 .data = &ipv6_devconf.accept_ra_defrtr,
5069 .maxlen = sizeof(int),
5071 .proc_handler = proc_dointvec,
5074 .procname = "accept_ra_pinfo",
5075 .data = &ipv6_devconf.accept_ra_pinfo,
5076 .maxlen = sizeof(int),
5078 .proc_handler = proc_dointvec,
5080 #ifdef CONFIG_IPV6_ROUTER_PREF
5082 .procname = "accept_ra_rtr_pref",
5083 .data = &ipv6_devconf.accept_ra_rtr_pref,
5084 .maxlen = sizeof(int),
5086 .proc_handler = proc_dointvec,
5089 .procname = "router_probe_interval",
5090 .data = &ipv6_devconf.rtr_probe_interval,
5091 .maxlen = sizeof(int),
5093 .proc_handler = proc_dointvec_jiffies,
5095 #ifdef CONFIG_IPV6_ROUTE_INFO
5097 .procname = "accept_ra_rt_info_max_plen",
5098 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
5099 .maxlen = sizeof(int),
5101 .proc_handler = proc_dointvec,
5106 .procname = "proxy_ndp",
5107 .data = &ipv6_devconf.proxy_ndp,
5108 .maxlen = sizeof(int),
5110 .proc_handler = addrconf_sysctl_proxy_ndp,
5113 .procname = "accept_source_route",
5114 .data = &ipv6_devconf.accept_source_route,
5115 .maxlen = sizeof(int),
5117 .proc_handler = proc_dointvec,
5119 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5121 .procname = "optimistic_dad",
5122 .data = &ipv6_devconf.optimistic_dad,
5123 .maxlen = sizeof(int),
5125 .proc_handler = proc_dointvec,
5129 #ifdef CONFIG_IPV6_MROUTE
5131 .procname = "mc_forwarding",
5132 .data = &ipv6_devconf.mc_forwarding,
5133 .maxlen = sizeof(int),
5135 .proc_handler = proc_dointvec,
5139 .procname = "disable_ipv6",
5140 .data = &ipv6_devconf.disable_ipv6,
5141 .maxlen = sizeof(int),
5143 .proc_handler = addrconf_sysctl_disable,
5146 .procname = "accept_dad",
5147 .data = &ipv6_devconf.accept_dad,
5148 .maxlen = sizeof(int),
5150 .proc_handler = proc_dointvec,
5153 .procname = "force_tllao",
5154 .data = &ipv6_devconf.force_tllao,
5155 .maxlen = sizeof(int),
5157 .proc_handler = proc_dointvec
5160 .procname = "ndisc_notify",
5161 .data = &ipv6_devconf.ndisc_notify,
5162 .maxlen = sizeof(int),
5164 .proc_handler = proc_dointvec
5167 .procname = "suppress_frag_ndisc",
5168 .data = &ipv6_devconf.suppress_frag_ndisc,
5169 .maxlen = sizeof(int),
5171 .proc_handler = proc_dointvec
5174 .procname = "accept_ra_from_local",
5175 .data = &ipv6_devconf.accept_ra_from_local,
5176 .maxlen = sizeof(int),
5178 .proc_handler = proc_dointvec,
5186 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
5187 struct inet6_dev *idev, struct ipv6_devconf *p)
5190 struct addrconf_sysctl_table *t;
5191 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
5193 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
5197 for (i = 0; t->addrconf_vars[i].data; i++) {
5198 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
5199 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
5200 t->addrconf_vars[i].extra2 = net;
5203 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
5205 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
5206 if (t->sysctl_header == NULL)
5218 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5220 struct addrconf_sysctl_table *t;
5222 if (p->sysctl == NULL)
5227 unregister_net_sysctl_table(t->sysctl_header);
5231 static void addrconf_sysctl_register(struct inet6_dev *idev)
5233 neigh_sysctl_register(idev->dev, idev->nd_parms,
5234 &ndisc_ifinfo_sysctl_change);
5235 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
5239 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
5241 __addrconf_sysctl_unregister(&idev->cnf);
5242 neigh_sysctl_unregister(idev->nd_parms);
5248 static int __net_init addrconf_init_net(struct net *net)
5251 struct ipv6_devconf *all, *dflt;
5253 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
5257 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
5259 goto err_alloc_dflt;
5261 /* these will be inherited by all namespaces */
5262 dflt->autoconf = ipv6_defaults.autoconf;
5263 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
5265 net->ipv6.devconf_all = all;
5266 net->ipv6.devconf_dflt = dflt;
5268 #ifdef CONFIG_SYSCTL
5269 err = __addrconf_sysctl_register(net, "all", NULL, all);
5273 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
5279 #ifdef CONFIG_SYSCTL
5281 __addrconf_sysctl_unregister(all);
5291 static void __net_exit addrconf_exit_net(struct net *net)
5293 #ifdef CONFIG_SYSCTL
5294 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5295 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5297 if (!net_eq(net, &init_net)) {
5298 kfree(net->ipv6.devconf_dflt);
5299 kfree(net->ipv6.devconf_all);
5303 static struct pernet_operations addrconf_ops = {
5304 .init = addrconf_init_net,
5305 .exit = addrconf_exit_net,
5308 static struct rtnl_af_ops inet6_ops = {
5310 .fill_link_af = inet6_fill_link_af,
5311 .get_link_af_size = inet6_get_link_af_size,
5312 .set_link_af = inet6_set_link_af,
5316 * Init / cleanup code
5319 int __init addrconf_init(void)
5323 err = ipv6_addr_label_init();
5325 pr_crit("%s: cannot initialize default policy table: %d\n",
5330 err = register_pernet_subsys(&addrconf_ops);
5334 addrconf_wq = create_workqueue("ipv6_addrconf");
5340 /* The addrconf netdev notifier requires that loopback_dev
5341 * has it's ipv6 private information allocated and setup
5342 * before it can bring up and give link-local addresses
5343 * to other devices which are up.
5345 * Unfortunately, loopback_dev is not necessarily the first
5346 * entry in the global dev_base list of net devices. In fact,
5347 * it is likely to be the very last entry on that list.
5348 * So this causes the notifier registry below to try and
5349 * give link-local addresses to all devices besides loopback_dev
5350 * first, then loopback_dev, which cases all the non-loopback_dev
5351 * devices to fail to get a link-local address.
5353 * So, as a temporary fix, allocate the ipv6 structure for
5354 * loopback_dev first by hand.
5355 * Longer term, all of the dependencies ipv6 has upon the loopback
5356 * device and it being up should be removed.
5359 if (!ipv6_add_dev(init_net.loopback_dev))
5365 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5366 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5368 register_netdevice_notifier(&ipv6_dev_notf);
5372 rtnl_af_register(&inet6_ops);
5374 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5379 /* Only the first call to __rtnl_register can fail */
5380 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5381 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5382 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5383 inet6_dump_ifaddr, NULL);
5384 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5385 inet6_dump_ifmcaddr, NULL);
5386 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5387 inet6_dump_ifacaddr, NULL);
5388 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
5389 inet6_netconf_dump_devconf, NULL);
5391 ipv6_addr_label_rtnl_register();
5395 rtnl_af_unregister(&inet6_ops);
5396 unregister_netdevice_notifier(&ipv6_dev_notf);
5398 destroy_workqueue(addrconf_wq);
5400 unregister_pernet_subsys(&addrconf_ops);
5402 ipv6_addr_label_cleanup();
5407 void addrconf_cleanup(void)
5409 struct net_device *dev;
5412 unregister_netdevice_notifier(&ipv6_dev_notf);
5413 unregister_pernet_subsys(&addrconf_ops);
5414 ipv6_addr_label_cleanup();
5418 __rtnl_af_unregister(&inet6_ops);
5420 /* clean dev list */
5421 for_each_netdev(&init_net, dev) {
5422 if (__in6_dev_get(dev) == NULL)
5424 addrconf_ifdown(dev, 1);
5426 addrconf_ifdown(init_net.loopback_dev, 2);
5431 spin_lock_bh(&addrconf_hash_lock);
5432 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5433 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5434 spin_unlock_bh(&addrconf_hash_lock);
5435 cancel_delayed_work(&addr_chk_work);
5438 destroy_workqueue(addrconf_wq);