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/inet.h>
50 #include <linux/in6.h>
51 #include <linux/netdevice.h>
52 #include <linux/if_addr.h>
53 #include <linux/if_arp.h>
54 #include <linux/if_arcnet.h>
55 #include <linux/if_infiniband.h>
56 #include <linux/route.h>
57 #include <linux/inetdevice.h>
58 #include <linux/init.h>
59 #include <linux/slab.h>
61 #include <linux/sysctl.h>
63 #include <linux/capability.h>
64 #include <linux/delay.h>
65 #include <linux/notifier.h>
66 #include <linux/string.h>
67 #include <linux/hash.h>
69 #include <net/net_namespace.h>
73 #include <net/af_ieee802154.h>
74 #include <net/firewire.h>
76 #include <net/protocol.h>
77 #include <net/ndisc.h>
78 #include <net/ip6_route.h>
79 #include <net/addrconf.h>
82 #include <net/netlink.h>
83 #include <net/pkt_sched.h>
84 #include <linux/if_tunnel.h>
85 #include <linux/rtnetlink.h>
86 #include <linux/netconf.h>
87 #include <linux/random.h>
88 #include <linux/uaccess.h>
89 #include <asm/unaligned.h>
91 #include <linux/proc_fs.h>
92 #include <linux/seq_file.h>
93 #include <linux/export.h>
95 /* Set to 3 to get tracing... */
99 #define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
101 #define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
104 #define INFINITY_LIFE_TIME 0xFFFFFFFF
106 #define IPV6_MAX_STRLEN \
107 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
109 static inline u32 cstamp_delta(unsigned long cstamp)
111 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
115 static int addrconf_sysctl_register(struct inet6_dev *idev);
116 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
118 static inline int addrconf_sysctl_register(struct inet6_dev *idev)
123 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
128 static void __ipv6_regen_rndid(struct inet6_dev *idev);
129 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
130 static void ipv6_regen_rndid(unsigned long data);
132 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
133 static int ipv6_count_addresses(struct inet6_dev *idev);
134 static int ipv6_generate_stable_address(struct in6_addr *addr,
136 const struct inet6_dev *idev);
139 * Configured unicast address hash table
141 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
142 static DEFINE_SPINLOCK(addrconf_hash_lock);
144 static void addrconf_verify(void);
145 static void addrconf_verify_rtnl(void);
146 static void addrconf_verify_work(struct work_struct *);
148 static struct workqueue_struct *addrconf_wq;
149 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
151 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
152 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
154 static void addrconf_type_change(struct net_device *dev,
155 unsigned long event);
156 static int addrconf_ifdown(struct net_device *dev, int how);
158 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
160 const struct net_device *dev,
161 u32 flags, u32 noflags);
163 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
164 static void addrconf_dad_work(struct work_struct *w);
165 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
166 static void addrconf_dad_run(struct inet6_dev *idev);
167 static void addrconf_rs_timer(unsigned long data);
168 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
169 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
171 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
172 struct prefix_info *pinfo);
173 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
174 struct net_device *dev);
176 static struct ipv6_devconf ipv6_devconf __read_mostly = {
178 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
179 .mtu6 = IPV6_MIN_MTU,
181 .accept_redirects = 1,
183 .force_mld_version = 0,
184 .mldv1_unsolicited_report_interval = 10 * HZ,
185 .mldv2_unsolicited_report_interval = HZ,
187 .rtr_solicits = MAX_RTR_SOLICITATIONS,
188 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
189 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
191 .temp_valid_lft = TEMP_VALID_LIFETIME,
192 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
193 .regen_max_retry = REGEN_MAX_RETRY,
194 .max_desync_factor = MAX_DESYNC_FACTOR,
195 .max_addresses = IPV6_MAX_ADDRESSES,
196 .accept_ra_defrtr = 1,
197 .accept_ra_from_local = 0,
198 .accept_ra_pinfo = 1,
199 #ifdef CONFIG_IPV6_ROUTER_PREF
200 .accept_ra_rtr_pref = 1,
201 .rtr_probe_interval = 60 * HZ,
202 #ifdef CONFIG_IPV6_ROUTE_INFO
203 .accept_ra_rt_info_max_plen = 0,
207 .accept_source_route = 0, /* we do not accept RH0 by default. */
210 .suppress_frag_ndisc = 1,
213 .initialized = false,
217 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
219 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
220 .mtu6 = IPV6_MIN_MTU,
222 .accept_redirects = 1,
224 .force_mld_version = 0,
225 .mldv1_unsolicited_report_interval = 10 * HZ,
226 .mldv2_unsolicited_report_interval = HZ,
228 .rtr_solicits = MAX_RTR_SOLICITATIONS,
229 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
230 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
232 .temp_valid_lft = TEMP_VALID_LIFETIME,
233 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
234 .regen_max_retry = REGEN_MAX_RETRY,
235 .max_desync_factor = MAX_DESYNC_FACTOR,
236 .max_addresses = IPV6_MAX_ADDRESSES,
237 .accept_ra_defrtr = 1,
238 .accept_ra_from_local = 0,
239 .accept_ra_pinfo = 1,
240 #ifdef CONFIG_IPV6_ROUTER_PREF
241 .accept_ra_rtr_pref = 1,
242 .rtr_probe_interval = 60 * HZ,
243 #ifdef CONFIG_IPV6_ROUTE_INFO
244 .accept_ra_rt_info_max_plen = 0,
248 .accept_source_route = 0, /* we do not accept RH0 by default. */
251 .suppress_frag_ndisc = 1,
254 .initialized = false,
258 /* Check if a valid qdisc is available */
259 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
261 return !qdisc_tx_is_noop(dev);
264 static void addrconf_del_rs_timer(struct inet6_dev *idev)
266 if (del_timer(&idev->rs_timer))
270 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
272 if (cancel_delayed_work(&ifp->dad_work))
276 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
279 if (!timer_pending(&idev->rs_timer))
281 mod_timer(&idev->rs_timer, jiffies + when);
284 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
287 if (!delayed_work_pending(&ifp->dad_work))
289 mod_delayed_work(addrconf_wq, &ifp->dad_work, delay);
292 static int snmp6_alloc_dev(struct inet6_dev *idev)
296 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
297 if (!idev->stats.ipv6)
300 for_each_possible_cpu(i) {
301 struct ipstats_mib *addrconf_stats;
302 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
303 u64_stats_init(&addrconf_stats->syncp);
307 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
309 if (!idev->stats.icmpv6dev)
311 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
313 if (!idev->stats.icmpv6msgdev)
319 kfree(idev->stats.icmpv6dev);
321 free_percpu(idev->stats.ipv6);
326 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
328 struct inet6_dev *ndev;
333 if (dev->mtu < IPV6_MIN_MTU)
334 return ERR_PTR(-EINVAL);
336 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
340 rwlock_init(&ndev->lock);
342 INIT_LIST_HEAD(&ndev->addr_list);
343 setup_timer(&ndev->rs_timer, addrconf_rs_timer,
344 (unsigned long)ndev);
345 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
346 ndev->cnf.mtu6 = dev->mtu;
347 ndev->cnf.sysctl = NULL;
348 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
349 if (!ndev->nd_parms) {
353 if (ndev->cnf.forwarding)
354 dev_disable_lro(dev);
355 /* We refer to the device */
358 if (snmp6_alloc_dev(ndev) < 0) {
360 "%s: cannot allocate memory for statistics; dev=%s.\n",
361 __func__, dev->name);
362 neigh_parms_release(&nd_tbl, ndev->nd_parms);
368 if (snmp6_register_dev(ndev) < 0) {
370 "%s: cannot create /proc/net/dev_snmp6/%s\n",
371 __func__, dev->name);
375 /* One reference from device. We must do this before
376 * we invoke __ipv6_regen_rndid().
380 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
381 ndev->cnf.accept_dad = -1;
383 #if IS_ENABLED(CONFIG_IPV6_SIT)
384 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
385 pr_info("%s: Disabled Multicast RS\n", dev->name);
386 ndev->cnf.rtr_solicits = 0;
390 INIT_LIST_HEAD(&ndev->tempaddr_list);
391 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
392 if ((dev->flags&IFF_LOOPBACK) ||
393 dev->type == ARPHRD_TUNNEL ||
394 dev->type == ARPHRD_TUNNEL6 ||
395 dev->type == ARPHRD_SIT ||
396 dev->type == ARPHRD_NONE) {
397 ndev->cnf.use_tempaddr = -1;
400 ipv6_regen_rndid((unsigned long) ndev);
403 ndev->token = in6addr_any;
405 if (netif_running(dev) && addrconf_qdisc_ok(dev))
406 ndev->if_flags |= IF_READY;
408 ipv6_mc_init_dev(ndev);
409 ndev->tstamp = jiffies;
410 err = addrconf_sysctl_register(ndev);
412 ipv6_mc_destroy_dev(ndev);
413 del_timer(&ndev->regen_timer);
416 /* protected by rtnl_lock */
417 rcu_assign_pointer(dev->ip6_ptr, ndev);
419 /* Join interface-local all-node multicast group */
420 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
422 /* Join all-node multicast group */
423 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
425 /* Join all-router multicast group if forwarding is set */
426 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
427 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
432 neigh_parms_release(&nd_tbl, ndev->nd_parms);
434 in6_dev_finish_destroy(ndev);
438 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
440 struct inet6_dev *idev;
444 idev = __in6_dev_get(dev);
446 idev = ipv6_add_dev(dev);
451 if (dev->flags&IFF_UP)
456 static int inet6_netconf_msgsize_devconf(int type)
458 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
459 + nla_total_size(4); /* NETCONFA_IFINDEX */
461 /* type -1 is used for ALL */
462 if (type == -1 || type == NETCONFA_FORWARDING)
463 size += nla_total_size(4);
464 #ifdef CONFIG_IPV6_MROUTE
465 if (type == -1 || type == NETCONFA_MC_FORWARDING)
466 size += nla_total_size(4);
468 if (type == -1 || type == NETCONFA_PROXY_NEIGH)
469 size += nla_total_size(4);
474 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
475 struct ipv6_devconf *devconf, u32 portid,
476 u32 seq, int event, unsigned int flags,
479 struct nlmsghdr *nlh;
480 struct netconfmsg *ncm;
482 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
487 ncm = nlmsg_data(nlh);
488 ncm->ncm_family = AF_INET6;
490 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
491 goto nla_put_failure;
493 /* type -1 is used for ALL */
494 if ((type == -1 || type == NETCONFA_FORWARDING) &&
495 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
496 goto nla_put_failure;
497 #ifdef CONFIG_IPV6_MROUTE
498 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
499 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
500 devconf->mc_forwarding) < 0)
501 goto nla_put_failure;
503 if ((type == -1 || type == NETCONFA_PROXY_NEIGH) &&
504 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
505 goto nla_put_failure;
511 nlmsg_cancel(skb, nlh);
515 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
516 struct ipv6_devconf *devconf)
521 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
525 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
526 RTM_NEWNETCONF, 0, type);
528 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
529 WARN_ON(err == -EMSGSIZE);
533 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
536 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
539 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
540 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
541 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
542 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
545 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
546 struct nlmsghdr *nlh)
548 struct net *net = sock_net(in_skb->sk);
549 struct nlattr *tb[NETCONFA_MAX+1];
550 struct netconfmsg *ncm;
552 struct ipv6_devconf *devconf;
553 struct inet6_dev *in6_dev;
554 struct net_device *dev;
558 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
559 devconf_ipv6_policy);
564 if (!tb[NETCONFA_IFINDEX])
567 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
569 case NETCONFA_IFINDEX_ALL:
570 devconf = net->ipv6.devconf_all;
572 case NETCONFA_IFINDEX_DEFAULT:
573 devconf = net->ipv6.devconf_dflt;
576 dev = __dev_get_by_index(net, ifindex);
579 in6_dev = __in6_dev_get(dev);
582 devconf = &in6_dev->cnf;
587 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
591 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
592 NETLINK_CB(in_skb).portid,
593 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
596 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
597 WARN_ON(err == -EMSGSIZE);
601 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
606 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
607 struct netlink_callback *cb)
609 struct net *net = sock_net(skb->sk);
612 struct net_device *dev;
613 struct inet6_dev *idev;
614 struct hlist_head *head;
617 s_idx = idx = cb->args[1];
619 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
621 head = &net->dev_index_head[h];
623 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
625 hlist_for_each_entry_rcu(dev, head, index_hlist) {
628 idev = __in6_dev_get(dev);
632 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
634 NETLINK_CB(cb->skb).portid,
642 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
648 if (h == NETDEV_HASHENTRIES) {
649 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
650 net->ipv6.devconf_all,
651 NETLINK_CB(cb->skb).portid,
653 RTM_NEWNETCONF, NLM_F_MULTI,
659 if (h == NETDEV_HASHENTRIES + 1) {
660 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
661 net->ipv6.devconf_dflt,
662 NETLINK_CB(cb->skb).portid,
664 RTM_NEWNETCONF, NLM_F_MULTI,
678 static void dev_forward_change(struct inet6_dev *idev)
680 struct net_device *dev;
681 struct inet6_ifaddr *ifa;
686 if (idev->cnf.forwarding)
687 dev_disable_lro(dev);
688 if (dev->flags & IFF_MULTICAST) {
689 if (idev->cnf.forwarding) {
690 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
691 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
692 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
694 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
695 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
696 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
700 list_for_each_entry(ifa, &idev->addr_list, if_list) {
701 if (ifa->flags&IFA_F_TENTATIVE)
703 if (idev->cnf.forwarding)
704 addrconf_join_anycast(ifa);
706 addrconf_leave_anycast(ifa);
708 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
709 dev->ifindex, &idev->cnf);
713 static void addrconf_forward_change(struct net *net, __s32 newf)
715 struct net_device *dev;
716 struct inet6_dev *idev;
718 for_each_netdev(net, dev) {
719 idev = __in6_dev_get(dev);
721 int changed = (!idev->cnf.forwarding) ^ (!newf);
722 idev->cnf.forwarding = newf;
724 dev_forward_change(idev);
729 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
735 return restart_syscall();
737 net = (struct net *)table->extra2;
741 if (p == &net->ipv6.devconf_dflt->forwarding) {
742 if ((!newf) ^ (!old))
743 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
744 NETCONFA_IFINDEX_DEFAULT,
745 net->ipv6.devconf_dflt);
750 if (p == &net->ipv6.devconf_all->forwarding) {
751 net->ipv6.devconf_dflt->forwarding = newf;
752 addrconf_forward_change(net, newf);
753 if ((!newf) ^ (!old))
754 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
755 NETCONFA_IFINDEX_ALL,
756 net->ipv6.devconf_all);
757 } else if ((!newf) ^ (!old))
758 dev_forward_change((struct inet6_dev *)table->extra1);
762 rt6_purge_dflt_routers(net);
767 /* Nobody refers to this ifaddr, destroy it */
768 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
770 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
772 #ifdef NET_REFCNT_DEBUG
773 pr_debug("%s\n", __func__);
776 in6_dev_put(ifp->idev);
778 if (cancel_delayed_work(&ifp->dad_work))
779 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
782 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
783 pr_warn("Freeing alive inet6 address %p\n", ifp);
792 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
795 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
798 * Each device address list is sorted in order of scope -
799 * global before linklocal.
801 list_for_each(p, &idev->addr_list) {
802 struct inet6_ifaddr *ifa
803 = list_entry(p, struct inet6_ifaddr, if_list);
804 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
808 list_add_tail(&ifp->if_list, p);
811 static u32 inet6_addr_hash(const struct in6_addr *addr)
813 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
816 /* On success it returns ifp with increased reference count */
818 static struct inet6_ifaddr *
819 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
820 const struct in6_addr *peer_addr, int pfxlen,
821 int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
823 struct inet6_ifaddr *ifa = NULL;
827 int addr_type = ipv6_addr_type(addr);
829 if (addr_type == IPV6_ADDR_ANY ||
830 addr_type & IPV6_ADDR_MULTICAST ||
831 (!(idev->dev->flags & IFF_LOOPBACK) &&
832 addr_type & IPV6_ADDR_LOOPBACK))
833 return ERR_PTR(-EADDRNOTAVAIL);
837 err = -ENODEV; /*XXX*/
841 if (idev->cnf.disable_ipv6) {
846 spin_lock(&addrconf_hash_lock);
848 /* Ignore adding duplicate addresses on an interface */
849 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
850 ADBG("ipv6_add_addr: already assigned\n");
855 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
858 ADBG("ipv6_add_addr: malloc failed\n");
863 rt = addrconf_dst_alloc(idev, addr, false);
869 neigh_parms_data_state_setall(idev->nd_parms);
873 ifa->peer_addr = *peer_addr;
875 spin_lock_init(&ifa->lock);
876 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
877 INIT_HLIST_NODE(&ifa->addr_lst);
879 ifa->prefix_len = pfxlen;
880 ifa->flags = flags | IFA_F_TENTATIVE;
881 ifa->valid_lft = valid_lft;
882 ifa->prefered_lft = prefered_lft;
883 ifa->cstamp = ifa->tstamp = jiffies;
884 ifa->tokenized = false;
893 /* Add to big hash table */
894 hash = inet6_addr_hash(addr);
896 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
897 spin_unlock(&addrconf_hash_lock);
899 write_lock(&idev->lock);
900 /* Add to inet6_dev unicast addr list. */
901 ipv6_link_dev_addr(idev, ifa);
903 if (ifa->flags&IFA_F_TEMPORARY) {
904 list_add(&ifa->tmp_list, &idev->tempaddr_list);
909 write_unlock(&idev->lock);
911 rcu_read_unlock_bh();
913 if (likely(err == 0))
914 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
922 spin_unlock(&addrconf_hash_lock);
926 enum cleanup_prefix_rt_t {
927 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
928 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
929 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
933 * Check, whether the prefix for ifp would still need a prefix route
934 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
937 * 1) we don't purge prefix if address was not permanent.
938 * prefix is managed by its own lifetime.
939 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
940 * 3) if there are no addresses, delete prefix.
941 * 4) if there are still other permanent address(es),
942 * corresponding prefix is still permanent.
943 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
944 * don't purge the prefix, assume user space is managing it.
945 * 6) otherwise, update prefix lifetime to the
946 * longest valid lifetime among the corresponding
947 * addresses on the device.
948 * Note: subsequent RA will update lifetime.
950 static enum cleanup_prefix_rt_t
951 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
953 struct inet6_ifaddr *ifa;
954 struct inet6_dev *idev = ifp->idev;
955 unsigned long lifetime;
956 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
960 list_for_each_entry(ifa, &idev->addr_list, if_list) {
963 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
966 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
967 return CLEANUP_PREFIX_RT_NOP;
969 action = CLEANUP_PREFIX_RT_EXPIRE;
971 spin_lock(&ifa->lock);
973 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
975 * Note: Because this address is
976 * not permanent, lifetime <
977 * LONG_MAX / HZ here.
979 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
980 *expires = ifa->tstamp + lifetime * HZ;
981 spin_unlock(&ifa->lock);
988 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
992 rt = addrconf_get_prefix_route(&ifp->addr,
995 0, RTF_GATEWAY | RTF_DEFAULT);
1000 if (!(rt->rt6i_flags & RTF_EXPIRES))
1001 rt6_set_expires(rt, expires);
1008 /* This function wants to get referenced ifp and releases it before return */
1010 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1013 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1014 unsigned long expires;
1018 spin_lock_bh(&ifp->lock);
1020 ifp->state = INET6_IFADDR_STATE_DEAD;
1021 spin_unlock_bh(&ifp->lock);
1023 if (state == INET6_IFADDR_STATE_DEAD)
1026 spin_lock_bh(&addrconf_hash_lock);
1027 hlist_del_init_rcu(&ifp->addr_lst);
1028 spin_unlock_bh(&addrconf_hash_lock);
1030 write_lock_bh(&ifp->idev->lock);
1032 if (ifp->flags&IFA_F_TEMPORARY) {
1033 list_del(&ifp->tmp_list);
1035 in6_ifa_put(ifp->ifpub);
1041 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1042 action = check_cleanup_prefix_route(ifp, &expires);
1044 list_del_init(&ifp->if_list);
1047 write_unlock_bh(&ifp->idev->lock);
1049 addrconf_del_dad_work(ifp);
1051 ipv6_ifa_notify(RTM_DELADDR, ifp);
1053 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1055 if (action != CLEANUP_PREFIX_RT_NOP) {
1056 cleanup_prefix_route(ifp, expires,
1057 action == CLEANUP_PREFIX_RT_DEL);
1060 /* clean up prefsrc entries */
1061 rt6_remove_prefsrc(ifp);
1066 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1068 struct inet6_dev *idev = ifp->idev;
1069 struct in6_addr addr, *tmpaddr;
1070 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1071 unsigned long regen_advance;
1075 unsigned long now = jiffies;
1077 write_lock_bh(&idev->lock);
1079 spin_lock_bh(&ift->lock);
1080 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1081 spin_unlock_bh(&ift->lock);
1088 if (idev->cnf.use_tempaddr <= 0) {
1089 write_unlock_bh(&idev->lock);
1090 pr_info("%s: use_tempaddr is disabled\n", __func__);
1095 spin_lock_bh(&ifp->lock);
1096 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1097 idev->cnf.use_tempaddr = -1; /*XXX*/
1098 spin_unlock_bh(&ifp->lock);
1099 write_unlock_bh(&idev->lock);
1100 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1107 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1108 __ipv6_try_regen_rndid(idev, tmpaddr);
1109 memcpy(&addr.s6_addr[8], idev->rndid, 8);
1110 age = (now - ifp->tstamp) / HZ;
1111 tmp_valid_lft = min_t(__u32,
1113 idev->cnf.temp_valid_lft + age);
1114 tmp_prefered_lft = min_t(__u32,
1116 idev->cnf.temp_prefered_lft + age -
1117 idev->cnf.max_desync_factor);
1118 tmp_plen = ifp->prefix_len;
1119 tmp_tstamp = ifp->tstamp;
1120 spin_unlock_bh(&ifp->lock);
1122 regen_advance = idev->cnf.regen_max_retry *
1123 idev->cnf.dad_transmits *
1124 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1125 write_unlock_bh(&idev->lock);
1127 /* A temporary address is created only if this calculated Preferred
1128 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1129 * an implementation must not create a temporary address with a zero
1130 * Preferred Lifetime.
1131 * Use age calculation as in addrconf_verify to avoid unnecessary
1132 * temporary addresses being generated.
1134 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1135 if (tmp_prefered_lft <= regen_advance + age) {
1142 addr_flags = IFA_F_TEMPORARY;
1143 /* set in addrconf_prefix_rcv() */
1144 if (ifp->flags & IFA_F_OPTIMISTIC)
1145 addr_flags |= IFA_F_OPTIMISTIC;
1147 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1148 ipv6_addr_scope(&addr), addr_flags,
1149 tmp_valid_lft, tmp_prefered_lft);
1153 pr_info("%s: retry temporary address regeneration\n", __func__);
1155 write_lock_bh(&idev->lock);
1159 spin_lock_bh(&ift->lock);
1162 ift->tstamp = tmp_tstamp;
1163 spin_unlock_bh(&ift->lock);
1165 addrconf_dad_start(ift);
1173 * Choose an appropriate source address (RFC3484)
1176 IPV6_SADDR_RULE_INIT = 0,
1177 IPV6_SADDR_RULE_LOCAL,
1178 IPV6_SADDR_RULE_SCOPE,
1179 IPV6_SADDR_RULE_PREFERRED,
1180 #ifdef CONFIG_IPV6_MIP6
1181 IPV6_SADDR_RULE_HOA,
1183 IPV6_SADDR_RULE_OIF,
1184 IPV6_SADDR_RULE_LABEL,
1185 IPV6_SADDR_RULE_PRIVACY,
1186 IPV6_SADDR_RULE_ORCHID,
1187 IPV6_SADDR_RULE_PREFIX,
1188 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1189 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1194 struct ipv6_saddr_score {
1197 struct inet6_ifaddr *ifa;
1198 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1203 struct ipv6_saddr_dst {
1204 const struct in6_addr *addr;
1211 static inline int ipv6_saddr_preferred(int type)
1213 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1218 static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev)
1220 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1221 return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic;
1227 static int ipv6_get_saddr_eval(struct net *net,
1228 struct ipv6_saddr_score *score,
1229 struct ipv6_saddr_dst *dst,
1234 if (i <= score->rule) {
1236 case IPV6_SADDR_RULE_SCOPE:
1237 ret = score->scopedist;
1239 case IPV6_SADDR_RULE_PREFIX:
1240 ret = score->matchlen;
1243 ret = !!test_bit(i, score->scorebits);
1249 case IPV6_SADDR_RULE_INIT:
1250 /* Rule 0: remember if hiscore is not ready yet */
1253 case IPV6_SADDR_RULE_LOCAL:
1254 /* Rule 1: Prefer same address */
1255 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1257 case IPV6_SADDR_RULE_SCOPE:
1258 /* Rule 2: Prefer appropriate scope
1263 * ---+--+-+---> scope
1265 * | d is scope of the destination.
1267 * | \ <- smaller scope is better if
1268 * B-15 | \ if scope is enough for destination.
1269 * | ret = B - scope (-1 <= scope >= d <= 15).
1271 * |/ <- greater is better
1272 * -C / if scope is not enough for destination.
1273 * /| ret = scope - C (-1 <= d < scope <= 15).
1275 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1276 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1277 * Assume B = 0 and we get C > 29.
1279 ret = __ipv6_addr_src_scope(score->addr_type);
1280 if (ret >= dst->scope)
1283 ret -= 128; /* 30 is enough */
1284 score->scopedist = ret;
1286 case IPV6_SADDR_RULE_PREFERRED:
1288 /* Rule 3: Avoid deprecated and optimistic addresses */
1289 u8 avoid = IFA_F_DEPRECATED;
1291 if (!ipv6_use_optimistic_addr(score->ifa->idev))
1292 avoid |= IFA_F_OPTIMISTIC;
1293 ret = ipv6_saddr_preferred(score->addr_type) ||
1294 !(score->ifa->flags & avoid);
1297 #ifdef CONFIG_IPV6_MIP6
1298 case IPV6_SADDR_RULE_HOA:
1300 /* Rule 4: Prefer home address */
1301 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1302 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1306 case IPV6_SADDR_RULE_OIF:
1307 /* Rule 5: Prefer outgoing interface */
1308 ret = (!dst->ifindex ||
1309 dst->ifindex == score->ifa->idev->dev->ifindex);
1311 case IPV6_SADDR_RULE_LABEL:
1312 /* Rule 6: Prefer matching label */
1313 ret = ipv6_addr_label(net,
1314 &score->ifa->addr, score->addr_type,
1315 score->ifa->idev->dev->ifindex) == dst->label;
1317 case IPV6_SADDR_RULE_PRIVACY:
1319 /* Rule 7: Prefer public address
1320 * Note: prefer temporary address if use_tempaddr >= 2
1322 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1323 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1324 score->ifa->idev->cnf.use_tempaddr >= 2;
1325 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1328 case IPV6_SADDR_RULE_ORCHID:
1329 /* Rule 8-: Prefer ORCHID vs ORCHID or
1330 * non-ORCHID vs non-ORCHID
1332 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1333 ipv6_addr_orchid(dst->addr));
1335 case IPV6_SADDR_RULE_PREFIX:
1336 /* Rule 8: Use longest matching prefix */
1337 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1338 if (ret > score->ifa->prefix_len)
1339 ret = score->ifa->prefix_len;
1340 score->matchlen = ret;
1342 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1343 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1344 /* Optimistic addresses still have lower precedence than other
1345 * preferred addresses.
1347 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1355 __set_bit(i, score->scorebits);
1361 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1362 const struct in6_addr *daddr, unsigned int prefs,
1363 struct in6_addr *saddr)
1365 struct ipv6_saddr_score scores[2],
1366 *score = &scores[0], *hiscore = &scores[1];
1367 struct ipv6_saddr_dst dst;
1368 struct net_device *dev;
1371 dst_type = __ipv6_addr_type(daddr);
1373 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1374 dst.scope = __ipv6_addr_src_scope(dst_type);
1375 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1379 hiscore->ifa = NULL;
1383 for_each_netdev_rcu(net, dev) {
1384 struct inet6_dev *idev;
1386 /* Candidate Source Address (section 4)
1387 * - multicast and link-local destination address,
1388 * the set of candidate source address MUST only
1389 * include addresses assigned to interfaces
1390 * belonging to the same link as the outgoing
1392 * (- For site-local destination addresses, the
1393 * set of candidate source addresses MUST only
1394 * include addresses assigned to interfaces
1395 * belonging to the same site as the outgoing
1398 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1399 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1400 dst.ifindex && dev->ifindex != dst.ifindex)
1403 idev = __in6_dev_get(dev);
1407 read_lock_bh(&idev->lock);
1408 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1412 * - Tentative Address (RFC2462 section 5.4)
1413 * - A tentative address is not considered
1414 * "assigned to an interface" in the traditional
1415 * sense, unless it is also flagged as optimistic.
1416 * - Candidate Source Address (section 4)
1417 * - In any case, anycast addresses, multicast
1418 * addresses, and the unspecified address MUST
1419 * NOT be included in a candidate set.
1421 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1422 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1425 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1427 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1428 score->addr_type & IPV6_ADDR_MULTICAST)) {
1429 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1435 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1437 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1438 int minihiscore, miniscore;
1440 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1441 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1443 if (minihiscore > miniscore) {
1444 if (i == IPV6_SADDR_RULE_SCOPE &&
1445 score->scopedist > 0) {
1448 * each remaining entry
1449 * has too small (not enough)
1450 * scope, because ifa entries
1451 * are sorted by their scope
1457 } else if (minihiscore < miniscore) {
1459 in6_ifa_put(hiscore->ifa);
1461 in6_ifa_hold(score->ifa);
1463 swap(hiscore, score);
1465 /* restore our iterator */
1466 score->ifa = hiscore->ifa;
1473 read_unlock_bh(&idev->lock);
1478 return -EADDRNOTAVAIL;
1480 *saddr = hiscore->ifa->addr;
1481 in6_ifa_put(hiscore->ifa);
1484 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1486 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1489 struct inet6_ifaddr *ifp;
1490 int err = -EADDRNOTAVAIL;
1492 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1493 if (ifp->scope > IFA_LINK)
1495 if (ifp->scope == IFA_LINK &&
1496 !(ifp->flags & banned_flags)) {
1505 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1508 struct inet6_dev *idev;
1509 int err = -EADDRNOTAVAIL;
1512 idev = __in6_dev_get(dev);
1514 read_lock_bh(&idev->lock);
1515 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1516 read_unlock_bh(&idev->lock);
1522 static int ipv6_count_addresses(struct inet6_dev *idev)
1525 struct inet6_ifaddr *ifp;
1527 read_lock_bh(&idev->lock);
1528 list_for_each_entry(ifp, &idev->addr_list, if_list)
1530 read_unlock_bh(&idev->lock);
1534 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1535 const struct net_device *dev, int strict)
1537 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
1539 EXPORT_SYMBOL(ipv6_chk_addr);
1541 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1542 const struct net_device *dev, int strict,
1545 struct inet6_ifaddr *ifp;
1546 unsigned int hash = inet6_addr_hash(addr);
1550 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1551 if (!net_eq(dev_net(ifp->idev->dev), net))
1553 /* Decouple optimistic from tentative for evaluation here.
1554 * Ban optimistic addresses explicitly, when required.
1556 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1557 ? (ifp->flags&~IFA_F_TENTATIVE)
1559 if (ipv6_addr_equal(&ifp->addr, addr) &&
1560 !(ifp_flags&banned_flags) &&
1561 (!dev || ifp->idev->dev == dev ||
1562 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1563 rcu_read_unlock_bh();
1568 rcu_read_unlock_bh();
1571 EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1573 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1574 struct net_device *dev)
1576 unsigned int hash = inet6_addr_hash(addr);
1577 struct inet6_ifaddr *ifp;
1579 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1580 if (!net_eq(dev_net(ifp->idev->dev), net))
1582 if (ipv6_addr_equal(&ifp->addr, addr)) {
1583 if (!dev || ifp->idev->dev == dev)
1590 /* Compares an address/prefix_len with addresses on device @dev.
1591 * If one is found it returns true.
1593 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1594 const unsigned int prefix_len, struct net_device *dev)
1596 struct inet6_dev *idev;
1597 struct inet6_ifaddr *ifa;
1601 idev = __in6_dev_get(dev);
1603 read_lock_bh(&idev->lock);
1604 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1605 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1609 read_unlock_bh(&idev->lock);
1615 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1617 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1619 struct inet6_dev *idev;
1620 struct inet6_ifaddr *ifa;
1625 idev = __in6_dev_get(dev);
1627 read_lock_bh(&idev->lock);
1628 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1629 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1634 read_unlock_bh(&idev->lock);
1639 EXPORT_SYMBOL(ipv6_chk_prefix);
1641 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1642 struct net_device *dev, int strict)
1644 struct inet6_ifaddr *ifp, *result = NULL;
1645 unsigned int hash = inet6_addr_hash(addr);
1648 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1649 if (!net_eq(dev_net(ifp->idev->dev), net))
1651 if (ipv6_addr_equal(&ifp->addr, addr)) {
1652 if (!dev || ifp->idev->dev == dev ||
1653 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1660 rcu_read_unlock_bh();
1665 /* Gets referenced address, destroys ifaddr */
1667 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1669 if (ifp->flags&IFA_F_PERMANENT) {
1670 spin_lock_bh(&ifp->lock);
1671 addrconf_del_dad_work(ifp);
1672 ifp->flags |= IFA_F_TENTATIVE;
1674 ifp->flags |= IFA_F_DADFAILED;
1675 spin_unlock_bh(&ifp->lock);
1677 ipv6_ifa_notify(0, ifp);
1679 } else if (ifp->flags&IFA_F_TEMPORARY) {
1680 struct inet6_ifaddr *ifpub;
1681 spin_lock_bh(&ifp->lock);
1684 in6_ifa_hold(ifpub);
1685 spin_unlock_bh(&ifp->lock);
1686 ipv6_create_tempaddr(ifpub, ifp);
1689 spin_unlock_bh(&ifp->lock);
1697 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1701 spin_lock_bh(&ifp->lock);
1702 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1703 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1706 spin_unlock_bh(&ifp->lock);
1711 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1713 struct in6_addr addr;
1714 struct inet6_dev *idev = ifp->idev;
1715 struct net *net = dev_net(ifp->idev->dev);
1717 if (addrconf_dad_end(ifp)) {
1722 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1723 ifp->idev->dev->name, &ifp->addr);
1725 spin_lock_bh(&ifp->lock);
1727 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
1728 int scope = ifp->scope;
1729 u32 flags = ifp->flags;
1730 struct in6_addr new_addr;
1731 struct inet6_ifaddr *ifp2;
1732 u32 valid_lft, preferred_lft;
1733 int pfxlen = ifp->prefix_len;
1734 int retries = ifp->stable_privacy_retry + 1;
1736 if (retries > net->ipv6.sysctl.idgen_retries) {
1737 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
1738 ifp->idev->dev->name);
1742 new_addr = ifp->addr;
1743 if (ipv6_generate_stable_address(&new_addr, retries,
1747 valid_lft = ifp->valid_lft;
1748 preferred_lft = ifp->prefered_lft;
1750 spin_unlock_bh(&ifp->lock);
1752 if (idev->cnf.max_addresses &&
1753 ipv6_count_addresses(idev) >=
1754 idev->cnf.max_addresses)
1757 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
1758 ifp->idev->dev->name);
1760 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
1761 scope, flags, valid_lft,
1766 spin_lock_bh(&ifp2->lock);
1767 ifp2->stable_privacy_retry = retries;
1768 ifp2->state = INET6_IFADDR_STATE_PREDAD;
1769 spin_unlock_bh(&ifp2->lock);
1771 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
1774 spin_lock_bh(&ifp->lock);
1775 } else if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1776 addr.s6_addr32[0] = htonl(0xfe800000);
1777 addr.s6_addr32[1] = 0;
1779 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1780 ipv6_addr_equal(&ifp->addr, &addr)) {
1781 /* DAD failed for link-local based on MAC address */
1782 idev->cnf.disable_ipv6 = 1;
1784 pr_info("%s: IPv6 being disabled!\n",
1785 ifp->idev->dev->name);
1790 /* transition from _POSTDAD to _ERRDAD */
1791 ifp->state = INET6_IFADDR_STATE_ERRDAD;
1792 spin_unlock_bh(&ifp->lock);
1794 addrconf_mod_dad_work(ifp, 0);
1797 /* Join to solicited addr multicast group.
1798 * caller must hold RTNL */
1799 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1801 struct in6_addr maddr;
1803 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1806 addrconf_addr_solict_mult(addr, &maddr);
1807 ipv6_dev_mc_inc(dev, &maddr);
1810 /* caller must hold RTNL */
1811 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1813 struct in6_addr maddr;
1815 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1818 addrconf_addr_solict_mult(addr, &maddr);
1819 __ipv6_dev_mc_dec(idev, &maddr);
1822 /* caller must hold RTNL */
1823 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1825 struct in6_addr addr;
1827 if (ifp->prefix_len >= 127) /* RFC 6164 */
1829 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1830 if (ipv6_addr_any(&addr))
1832 __ipv6_dev_ac_inc(ifp->idev, &addr);
1835 /* caller must hold RTNL */
1836 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1838 struct in6_addr addr;
1840 if (ifp->prefix_len >= 127) /* RFC 6164 */
1842 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1843 if (ipv6_addr_any(&addr))
1845 __ipv6_dev_ac_dec(ifp->idev, &addr);
1848 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1850 if (dev->addr_len != ETH_ALEN)
1852 memcpy(eui, dev->dev_addr, 3);
1853 memcpy(eui + 5, dev->dev_addr + 3, 3);
1856 * The zSeries OSA network cards can be shared among various
1857 * OS instances, but the OSA cards have only one MAC address.
1858 * This leads to duplicate address conflicts in conjunction
1859 * with IPv6 if more than one instance uses the same card.
1861 * The driver for these cards can deliver a unique 16-bit
1862 * identifier for each instance sharing the same card. It is
1863 * placed instead of 0xFFFE in the interface identifier. The
1864 * "u" bit of the interface identifier is not inverted in this
1865 * case. Hence the resulting interface identifier has local
1866 * scope according to RFC2373.
1869 eui[3] = (dev->dev_id >> 8) & 0xFF;
1870 eui[4] = dev->dev_id & 0xFF;
1879 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1881 if (dev->addr_len != IEEE802154_ADDR_LEN)
1883 memcpy(eui, dev->dev_addr, 8);
1888 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1890 union fwnet_hwaddr *ha;
1892 if (dev->addr_len != FWNET_ALEN)
1895 ha = (union fwnet_hwaddr *)dev->dev_addr;
1897 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1902 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1904 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1905 if (dev->addr_len != ARCNET_ALEN)
1908 eui[7] = *(u8 *)dev->dev_addr;
1912 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1914 if (dev->addr_len != INFINIBAND_ALEN)
1916 memcpy(eui, dev->dev_addr + 12, 8);
1921 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1925 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1926 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1927 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1928 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1929 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1930 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1934 memcpy(eui + 4, &addr, 4);
1938 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1940 if (dev->priv_flags & IFF_ISATAP)
1941 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1945 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1947 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1950 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
1952 memcpy(eui, dev->perm_addr, 3);
1953 memcpy(eui + 5, dev->perm_addr + 3, 3);
1960 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1962 switch (dev->type) {
1965 return addrconf_ifid_eui48(eui, dev);
1967 return addrconf_ifid_arcnet(eui, dev);
1968 case ARPHRD_INFINIBAND:
1969 return addrconf_ifid_infiniband(eui, dev);
1971 return addrconf_ifid_sit(eui, dev);
1973 return addrconf_ifid_gre(eui, dev);
1974 case ARPHRD_6LOWPAN:
1975 case ARPHRD_IEEE802154:
1976 return addrconf_ifid_eui64(eui, dev);
1977 case ARPHRD_IEEE1394:
1978 return addrconf_ifid_ieee1394(eui, dev);
1979 case ARPHRD_TUNNEL6:
1980 return addrconf_ifid_ip6tnl(eui, dev);
1985 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1988 struct inet6_ifaddr *ifp;
1990 read_lock_bh(&idev->lock);
1991 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1992 if (ifp->scope > IFA_LINK)
1994 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1995 memcpy(eui, ifp->addr.s6_addr+8, 8);
2000 read_unlock_bh(&idev->lock);
2004 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
2005 static void __ipv6_regen_rndid(struct inet6_dev *idev)
2008 get_random_bytes(idev->rndid, sizeof(idev->rndid));
2009 idev->rndid[0] &= ~0x02;
2012 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2013 * check if generated address is not inappropriate
2015 * - Reserved subnet anycast (RFC 2526)
2016 * 11111101 11....11 1xxxxxxx
2017 * - ISATAP (RFC4214) 6.1
2018 * 00-00-5E-FE-xx-xx-xx-xx
2020 * - XXX: already assigned to an address on the device
2022 if (idev->rndid[0] == 0xfd &&
2023 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2024 (idev->rndid[7]&0x80))
2026 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2027 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2029 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2034 static void ipv6_regen_rndid(unsigned long data)
2036 struct inet6_dev *idev = (struct inet6_dev *) data;
2037 unsigned long expires;
2040 write_lock_bh(&idev->lock);
2045 __ipv6_regen_rndid(idev);
2048 idev->cnf.temp_prefered_lft * HZ -
2049 idev->cnf.regen_max_retry * idev->cnf.dad_transmits *
2050 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) -
2051 idev->cnf.max_desync_factor * HZ;
2052 if (time_before(expires, jiffies)) {
2053 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
2054 __func__, idev->dev->name);
2058 if (!mod_timer(&idev->regen_timer, expires))
2062 write_unlock_bh(&idev->lock);
2063 rcu_read_unlock_bh();
2067 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
2069 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
2070 __ipv6_regen_rndid(idev);
2078 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
2079 unsigned long expires, u32 flags)
2081 struct fib6_config cfg = {
2082 .fc_table = RT6_TABLE_PREFIX,
2083 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2084 .fc_ifindex = dev->ifindex,
2085 .fc_expires = expires,
2087 .fc_flags = RTF_UP | flags,
2088 .fc_nlinfo.nl_net = dev_net(dev),
2089 .fc_protocol = RTPROT_KERNEL,
2094 /* Prevent useless cloning on PtP SIT.
2095 This thing is done here expecting that the whole
2096 class of non-broadcast devices need not cloning.
2098 #if IS_ENABLED(CONFIG_IPV6_SIT)
2099 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2100 cfg.fc_flags |= RTF_NONEXTHOP;
2103 ip6_route_add(&cfg);
2107 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2109 const struct net_device *dev,
2110 u32 flags, u32 noflags)
2112 struct fib6_node *fn;
2113 struct rt6_info *rt = NULL;
2114 struct fib6_table *table;
2116 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
2120 read_lock_bh(&table->tb6_lock);
2121 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2124 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2125 if (rt->dst.dev->ifindex != dev->ifindex)
2127 if ((rt->rt6i_flags & flags) != flags)
2129 if ((rt->rt6i_flags & noflags) != 0)
2135 read_unlock_bh(&table->tb6_lock);
2140 /* Create "default" multicast route to the interface */
2142 static void addrconf_add_mroute(struct net_device *dev)
2144 struct fib6_config cfg = {
2145 .fc_table = RT6_TABLE_LOCAL,
2146 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2147 .fc_ifindex = dev->ifindex,
2150 .fc_nlinfo.nl_net = dev_net(dev),
2153 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2155 ip6_route_add(&cfg);
2158 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2160 struct inet6_dev *idev;
2164 idev = ipv6_find_idev(dev);
2166 return ERR_PTR(-ENOBUFS);
2168 if (idev->cnf.disable_ipv6)
2169 return ERR_PTR(-EACCES);
2171 /* Add default multicast route */
2172 if (!(dev->flags & IFF_LOOPBACK))
2173 addrconf_add_mroute(dev);
2178 static void manage_tempaddrs(struct inet6_dev *idev,
2179 struct inet6_ifaddr *ifp,
2180 __u32 valid_lft, __u32 prefered_lft,
2181 bool create, unsigned long now)
2184 struct inet6_ifaddr *ift;
2186 read_lock_bh(&idev->lock);
2187 /* update all temporary addresses in the list */
2188 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2189 int age, max_valid, max_prefered;
2191 if (ifp != ift->ifpub)
2194 /* RFC 4941 section 3.3:
2195 * If a received option will extend the lifetime of a public
2196 * address, the lifetimes of temporary addresses should
2197 * be extended, subject to the overall constraint that no
2198 * temporary addresses should ever remain "valid" or "preferred"
2199 * for a time longer than (TEMP_VALID_LIFETIME) or
2200 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2202 age = (now - ift->cstamp) / HZ;
2203 max_valid = idev->cnf.temp_valid_lft - age;
2207 max_prefered = idev->cnf.temp_prefered_lft -
2208 idev->cnf.max_desync_factor - age;
2209 if (max_prefered < 0)
2212 if (valid_lft > max_valid)
2213 valid_lft = max_valid;
2215 if (prefered_lft > max_prefered)
2216 prefered_lft = max_prefered;
2218 spin_lock(&ift->lock);
2220 ift->valid_lft = valid_lft;
2221 ift->prefered_lft = prefered_lft;
2223 if (prefered_lft > 0)
2224 ift->flags &= ~IFA_F_DEPRECATED;
2226 spin_unlock(&ift->lock);
2227 if (!(flags&IFA_F_TENTATIVE))
2228 ipv6_ifa_notify(0, ift);
2231 if ((create || list_empty(&idev->tempaddr_list)) &&
2232 idev->cnf.use_tempaddr > 0) {
2233 /* When a new public address is created as described
2234 * in [ADDRCONF], also create a new temporary address.
2235 * Also create a temporary address if it's enabled but
2236 * no temporary address currently exists.
2238 read_unlock_bh(&idev->lock);
2239 ipv6_create_tempaddr(ifp, NULL);
2241 read_unlock_bh(&idev->lock);
2245 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2247 struct prefix_info *pinfo;
2252 struct inet6_dev *in6_dev;
2253 struct net *net = dev_net(dev);
2255 pinfo = (struct prefix_info *) opt;
2257 if (len < sizeof(struct prefix_info)) {
2258 ADBG("addrconf: prefix option too short\n");
2263 * Validation checks ([ADDRCONF], page 19)
2266 addr_type = ipv6_addr_type(&pinfo->prefix);
2268 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2271 valid_lft = ntohl(pinfo->valid);
2272 prefered_lft = ntohl(pinfo->prefered);
2274 if (prefered_lft > valid_lft) {
2275 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2279 in6_dev = in6_dev_get(dev);
2282 net_dbg_ratelimited("addrconf: device %s not configured\n",
2288 * Two things going on here:
2289 * 1) Add routes for on-link prefixes
2290 * 2) Configure prefixes with the auto flag set
2293 if (pinfo->onlink) {
2294 struct rt6_info *rt;
2295 unsigned long rt_expires;
2297 /* Avoid arithmetic overflow. Really, we could
2298 * save rt_expires in seconds, likely valid_lft,
2299 * but it would require division in fib gc, that it
2303 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2305 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2307 if (addrconf_finite_timeout(rt_expires))
2310 rt = addrconf_get_prefix_route(&pinfo->prefix,
2313 RTF_ADDRCONF | RTF_PREFIX_RT,
2314 RTF_GATEWAY | RTF_DEFAULT);
2317 /* Autoconf prefix route */
2318 if (valid_lft == 0) {
2321 } else if (addrconf_finite_timeout(rt_expires)) {
2323 rt6_set_expires(rt, jiffies + rt_expires);
2325 rt6_clean_expires(rt);
2327 } else if (valid_lft) {
2328 clock_t expires = 0;
2329 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2330 if (addrconf_finite_timeout(rt_expires)) {
2332 flags |= RTF_EXPIRES;
2333 expires = jiffies_to_clock_t(rt_expires);
2335 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2336 dev, expires, flags);
2341 /* Try to figure out our local address for this prefix */
2343 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2344 struct inet6_ifaddr *ifp;
2345 struct in6_addr addr;
2346 int create = 0, update_lft = 0;
2347 bool tokenized = false;
2349 if (pinfo->prefix_len == 64) {
2350 memcpy(&addr, &pinfo->prefix, 8);
2352 if (!ipv6_addr_any(&in6_dev->token)) {
2353 read_lock_bh(&in6_dev->lock);
2354 memcpy(addr.s6_addr + 8,
2355 in6_dev->token.s6_addr + 8, 8);
2356 read_unlock_bh(&in6_dev->lock);
2358 } else if (in6_dev->addr_gen_mode ==
2359 IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
2360 !ipv6_generate_stable_address(&addr, 0,
2362 addr_flags |= IFA_F_STABLE_PRIVACY;
2364 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2365 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2366 in6_dev_put(in6_dev);
2371 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2373 in6_dev_put(in6_dev);
2378 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
2380 if (!ifp && valid_lft) {
2381 int max_addresses = in6_dev->cnf.max_addresses;
2383 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2384 if (in6_dev->cnf.optimistic_dad &&
2385 !net->ipv6.devconf_all->forwarding && sllao)
2386 addr_flags = IFA_F_OPTIMISTIC;
2389 /* Do not allow to create too much of autoconfigured
2390 * addresses; this would be too easy way to crash kernel.
2392 if (!max_addresses ||
2393 ipv6_count_addresses(in6_dev) < max_addresses)
2394 ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2396 addr_type&IPV6_ADDR_SCOPE_MASK,
2397 addr_flags, valid_lft,
2400 if (IS_ERR_OR_NULL(ifp)) {
2401 in6_dev_put(in6_dev);
2407 spin_lock_bh(&ifp->lock);
2408 ifp->flags |= IFA_F_MANAGETEMPADDR;
2409 ifp->cstamp = jiffies;
2410 ifp->tokenized = tokenized;
2411 spin_unlock_bh(&ifp->lock);
2412 addrconf_dad_start(ifp);
2420 /* update lifetime (RFC2462 5.5.3 e) */
2421 spin_lock_bh(&ifp->lock);
2423 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2424 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2427 if (!update_lft && !create && stored_lft) {
2428 const u32 minimum_lft = min_t(u32,
2429 stored_lft, MIN_VALID_LIFETIME);
2430 valid_lft = max(valid_lft, minimum_lft);
2432 /* RFC4862 Section 5.5.3e:
2433 * "Note that the preferred lifetime of the
2434 * corresponding address is always reset to
2435 * the Preferred Lifetime in the received
2436 * Prefix Information option, regardless of
2437 * whether the valid lifetime is also reset or
2440 * So we should always update prefered_lft here.
2446 ifp->valid_lft = valid_lft;
2447 ifp->prefered_lft = prefered_lft;
2450 ifp->flags &= ~IFA_F_DEPRECATED;
2451 spin_unlock_bh(&ifp->lock);
2453 if (!(flags&IFA_F_TENTATIVE))
2454 ipv6_ifa_notify(0, ifp);
2456 spin_unlock_bh(&ifp->lock);
2458 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2465 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2466 in6_dev_put(in6_dev);
2470 * Set destination address.
2471 * Special case for SIT interfaces where we create a new "virtual"
2474 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2476 struct in6_ifreq ireq;
2477 struct net_device *dev;
2483 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2486 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2492 #if IS_ENABLED(CONFIG_IPV6_SIT)
2493 if (dev->type == ARPHRD_SIT) {
2494 const struct net_device_ops *ops = dev->netdev_ops;
2496 struct ip_tunnel_parm p;
2498 err = -EADDRNOTAVAIL;
2499 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2502 memset(&p, 0, sizeof(p));
2503 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2507 p.iph.protocol = IPPROTO_IPV6;
2509 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2511 if (ops->ndo_do_ioctl) {
2512 mm_segment_t oldfs = get_fs();
2515 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2522 dev = __dev_get_by_name(net, p.name);
2525 err = dev_open(dev);
2535 static int ipv6_mc_config(struct sock *sk, bool join,
2536 const struct in6_addr *addr, int ifindex)
2544 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2546 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2553 * Manual configuration of address on an interface
2555 static int inet6_addr_add(struct net *net, int ifindex,
2556 const struct in6_addr *pfx,
2557 const struct in6_addr *peer_pfx,
2558 unsigned int plen, __u32 ifa_flags,
2559 __u32 prefered_lft, __u32 valid_lft)
2561 struct inet6_ifaddr *ifp;
2562 struct inet6_dev *idev;
2563 struct net_device *dev;
2564 unsigned long timeout;
2574 /* check the lifetime */
2575 if (!valid_lft || prefered_lft > valid_lft)
2578 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2581 dev = __dev_get_by_index(net, ifindex);
2585 idev = addrconf_add_dev(dev);
2587 return PTR_ERR(idev);
2589 if (ifa_flags & IFA_F_MCAUTOJOIN) {
2590 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2591 true, pfx, ifindex);
2597 scope = ipv6_addr_scope(pfx);
2599 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2600 if (addrconf_finite_timeout(timeout)) {
2601 expires = jiffies_to_clock_t(timeout * HZ);
2602 valid_lft = timeout;
2603 flags = RTF_EXPIRES;
2607 ifa_flags |= IFA_F_PERMANENT;
2610 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2611 if (addrconf_finite_timeout(timeout)) {
2613 ifa_flags |= IFA_F_DEPRECATED;
2614 prefered_lft = timeout;
2617 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2618 valid_lft, prefered_lft);
2621 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2622 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2627 * Note that section 3.1 of RFC 4429 indicates
2628 * that the Optimistic flag should not be set for
2629 * manually configured addresses
2631 addrconf_dad_start(ifp);
2632 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2633 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2636 addrconf_verify_rtnl();
2638 } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2639 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2640 false, pfx, ifindex);
2643 return PTR_ERR(ifp);
2646 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2647 const struct in6_addr *pfx, unsigned int plen)
2649 struct inet6_ifaddr *ifp;
2650 struct inet6_dev *idev;
2651 struct net_device *dev;
2656 dev = __dev_get_by_index(net, ifindex);
2660 idev = __in6_dev_get(dev);
2664 read_lock_bh(&idev->lock);
2665 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2666 if (ifp->prefix_len == plen &&
2667 ipv6_addr_equal(pfx, &ifp->addr)) {
2669 read_unlock_bh(&idev->lock);
2671 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2672 (ifa_flags & IFA_F_MANAGETEMPADDR))
2673 manage_tempaddrs(idev, ifp, 0, 0, false,
2676 addrconf_verify_rtnl();
2677 if (ipv6_addr_is_multicast(pfx)) {
2678 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2679 false, pfx, dev->ifindex);
2684 read_unlock_bh(&idev->lock);
2685 return -EADDRNOTAVAIL;
2689 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2691 struct in6_ifreq ireq;
2694 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2697 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2701 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2702 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2703 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2708 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2710 struct in6_ifreq ireq;
2713 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2716 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2720 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
2721 ireq.ifr6_prefixlen);
2726 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2727 int plen, int scope)
2729 struct inet6_ifaddr *ifp;
2731 ifp = ipv6_add_addr(idev, addr, NULL, plen,
2732 scope, IFA_F_PERMANENT,
2733 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2735 spin_lock_bh(&ifp->lock);
2736 ifp->flags &= ~IFA_F_TENTATIVE;
2737 spin_unlock_bh(&ifp->lock);
2738 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2743 #if IS_ENABLED(CONFIG_IPV6_SIT)
2744 static void sit_add_v4_addrs(struct inet6_dev *idev)
2746 struct in6_addr addr;
2747 struct net_device *dev;
2748 struct net *net = dev_net(idev->dev);
2754 memset(&addr, 0, sizeof(struct in6_addr));
2755 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2757 if (idev->dev->flags&IFF_POINTOPOINT) {
2758 addr.s6_addr32[0] = htonl(0xfe800000);
2762 scope = IPV6_ADDR_COMPATv4;
2764 pflags |= RTF_NONEXTHOP;
2767 if (addr.s6_addr32[3]) {
2768 add_addr(idev, &addr, plen, scope);
2769 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
2773 for_each_netdev(net, dev) {
2774 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2775 if (in_dev && (dev->flags & IFF_UP)) {
2776 struct in_ifaddr *ifa;
2780 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2782 addr.s6_addr32[3] = ifa->ifa_local;
2784 if (ifa->ifa_scope == RT_SCOPE_LINK)
2786 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2787 if (idev->dev->flags&IFF_POINTOPOINT)
2792 add_addr(idev, &addr, plen, flag);
2793 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2801 static void init_loopback(struct net_device *dev)
2803 struct inet6_dev *idev;
2804 struct net_device *sp_dev;
2805 struct inet6_ifaddr *sp_ifa;
2806 struct rt6_info *sp_rt;
2812 idev = ipv6_find_idev(dev);
2814 pr_debug("%s: add_dev failed\n", __func__);
2818 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2820 /* Add routes to other interface's IPv6 addresses */
2821 for_each_netdev(dev_net(dev), sp_dev) {
2822 if (!strcmp(sp_dev->name, dev->name))
2825 idev = __in6_dev_get(sp_dev);
2829 read_lock_bh(&idev->lock);
2830 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2832 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2836 /* This dst has been added to garbage list when
2837 * lo device down, release this obsolete dst and
2838 * reallocate a new router for ifa.
2840 if (sp_ifa->rt->dst.obsolete > 0) {
2841 ip6_rt_put(sp_ifa->rt);
2848 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
2850 /* Failure cases are ignored */
2851 if (!IS_ERR(sp_rt)) {
2856 read_unlock_bh(&idev->lock);
2860 static void addrconf_add_linklocal(struct inet6_dev *idev,
2861 const struct in6_addr *addr, u32 flags)
2863 struct inet6_ifaddr *ifp;
2864 u32 addr_flags = flags | IFA_F_PERMANENT;
2866 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2867 if (idev->cnf.optimistic_dad &&
2868 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2869 addr_flags |= IFA_F_OPTIMISTIC;
2872 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
2873 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2875 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2876 addrconf_dad_start(ifp);
2881 static bool ipv6_reserved_interfaceid(struct in6_addr address)
2883 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
2886 if (address.s6_addr32[2] == htonl(0x02005eff) &&
2887 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
2890 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
2891 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
2897 static int ipv6_generate_stable_address(struct in6_addr *address,
2899 const struct inet6_dev *idev)
2901 static DEFINE_SPINLOCK(lock);
2902 static __u32 digest[SHA_DIGEST_WORDS];
2903 static __u32 workspace[SHA_WORKSPACE_WORDS];
2906 char __data[SHA_MESSAGE_BYTES];
2908 struct in6_addr secret;
2910 unsigned char hwaddr[MAX_ADDR_LEN];
2915 struct in6_addr secret;
2916 struct in6_addr temp;
2917 struct net *net = dev_net(idev->dev);
2919 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
2921 if (idev->cnf.stable_secret.initialized)
2922 secret = idev->cnf.stable_secret.secret;
2923 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
2924 secret = net->ipv6.devconf_dflt->stable_secret.secret;
2929 spin_lock_bh(&lock);
2932 memset(&data, 0, sizeof(data));
2933 memset(workspace, 0, sizeof(workspace));
2934 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
2935 data.prefix[0] = address->s6_addr32[0];
2936 data.prefix[1] = address->s6_addr32[1];
2937 data.secret = secret;
2938 data.dad_count = dad_count;
2940 sha_transform(digest, data.__data, workspace);
2943 temp.s6_addr32[2] = (__force __be32)digest[0];
2944 temp.s6_addr32[3] = (__force __be32)digest[1];
2946 spin_unlock_bh(&lock);
2948 if (ipv6_reserved_interfaceid(temp)) {
2950 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
2959 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
2961 struct in6_addr addr;
2963 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2965 if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY) {
2966 if (!ipv6_generate_stable_address(&addr, 0, idev))
2967 addrconf_add_linklocal(idev, &addr,
2968 IFA_F_STABLE_PRIVACY);
2969 else if (prefix_route)
2970 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
2971 } else if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) {
2972 /* addrconf_add_linklocal also adds a prefix_route and we
2973 * only need to care about prefix routes if ipv6_generate_eui64
2974 * couldn't generate one.
2976 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
2977 addrconf_add_linklocal(idev, &addr, 0);
2978 else if (prefix_route)
2979 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
2983 static void addrconf_dev_config(struct net_device *dev)
2985 struct inet6_dev *idev;
2989 if ((dev->type != ARPHRD_ETHER) &&
2990 (dev->type != ARPHRD_FDDI) &&
2991 (dev->type != ARPHRD_ARCNET) &&
2992 (dev->type != ARPHRD_INFINIBAND) &&
2993 (dev->type != ARPHRD_IEEE802154) &&
2994 (dev->type != ARPHRD_IEEE1394) &&
2995 (dev->type != ARPHRD_TUNNEL6) &&
2996 (dev->type != ARPHRD_6LOWPAN)) {
2997 /* Alas, we support only Ethernet autoconfiguration. */
3001 idev = addrconf_add_dev(dev);
3005 addrconf_addr_gen(idev, false);
3008 #if IS_ENABLED(CONFIG_IPV6_SIT)
3009 static void addrconf_sit_config(struct net_device *dev)
3011 struct inet6_dev *idev;
3016 * Configure the tunnel with one of our IPv4
3017 * addresses... we should configure all of
3018 * our v4 addrs in the tunnel
3021 idev = ipv6_find_idev(dev);
3023 pr_debug("%s: add_dev failed\n", __func__);
3027 if (dev->priv_flags & IFF_ISATAP) {
3028 addrconf_addr_gen(idev, false);
3032 sit_add_v4_addrs(idev);
3034 if (dev->flags&IFF_POINTOPOINT)
3035 addrconf_add_mroute(dev);
3039 #if IS_ENABLED(CONFIG_NET_IPGRE)
3040 static void addrconf_gre_config(struct net_device *dev)
3042 struct inet6_dev *idev;
3046 idev = ipv6_find_idev(dev);
3048 pr_debug("%s: add_dev failed\n", __func__);
3052 addrconf_addr_gen(idev, true);
3056 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3059 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3060 struct inet6_dev *idev = __in6_dev_get(dev);
3061 int run_pending = 0;
3065 case NETDEV_REGISTER:
3066 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3067 idev = ipv6_add_dev(dev);
3069 return notifier_from_errno(PTR_ERR(idev));
3075 if (dev->flags & IFF_SLAVE)
3078 if (idev && idev->cnf.disable_ipv6)
3081 if (event == NETDEV_UP) {
3082 if (!addrconf_qdisc_ok(dev)) {
3083 /* device is not ready yet. */
3084 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3089 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3090 idev = ipv6_add_dev(dev);
3092 if (!IS_ERR_OR_NULL(idev)) {
3093 idev->if_flags |= IF_READY;
3097 if (!addrconf_qdisc_ok(dev)) {
3098 /* device is still not ready. */
3103 if (idev->if_flags & IF_READY)
3104 /* device is already configured. */
3106 idev->if_flags |= IF_READY;
3109 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3115 switch (dev->type) {
3116 #if IS_ENABLED(CONFIG_IPV6_SIT)
3118 addrconf_sit_config(dev);
3121 #if IS_ENABLED(CONFIG_NET_IPGRE)
3123 addrconf_gre_config(dev);
3126 case ARPHRD_LOOPBACK:
3131 addrconf_dev_config(dev);
3135 if (!IS_ERR_OR_NULL(idev)) {
3137 addrconf_dad_run(idev);
3140 * If the MTU changed during the interface down,
3141 * when the interface up, the changed MTU must be
3142 * reflected in the idev as well as routers.
3144 if (idev->cnf.mtu6 != dev->mtu &&
3145 dev->mtu >= IPV6_MIN_MTU) {
3146 rt6_mtu_change(dev, dev->mtu);
3147 idev->cnf.mtu6 = dev->mtu;
3149 idev->tstamp = jiffies;
3150 inet6_ifinfo_notify(RTM_NEWLINK, idev);
3153 * If the changed mtu during down is lower than
3154 * IPV6_MIN_MTU stop IPv6 on this interface.
3156 if (dev->mtu < IPV6_MIN_MTU)
3157 addrconf_ifdown(dev, 1);
3161 case NETDEV_CHANGEMTU:
3162 if (idev && dev->mtu >= IPV6_MIN_MTU) {
3163 rt6_mtu_change(dev, dev->mtu);
3164 idev->cnf.mtu6 = dev->mtu;
3168 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3169 idev = ipv6_add_dev(dev);
3175 * if MTU under IPV6_MIN_MTU.
3176 * Stop IPv6 on this interface.
3180 case NETDEV_UNREGISTER:
3182 * Remove all addresses from this interface.
3184 addrconf_ifdown(dev, event != NETDEV_DOWN);
3187 case NETDEV_CHANGENAME:
3189 snmp6_unregister_dev(idev);
3190 addrconf_sysctl_unregister(idev);
3191 err = addrconf_sysctl_register(idev);
3193 return notifier_from_errno(err);
3194 err = snmp6_register_dev(idev);
3196 addrconf_sysctl_unregister(idev);
3197 return notifier_from_errno(err);
3202 case NETDEV_PRE_TYPE_CHANGE:
3203 case NETDEV_POST_TYPE_CHANGE:
3204 addrconf_type_change(dev, event);
3212 * addrconf module should be notified of a device going up
3214 static struct notifier_block ipv6_dev_notf = {
3215 .notifier_call = addrconf_notify,
3218 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3220 struct inet6_dev *idev;
3223 idev = __in6_dev_get(dev);
3225 if (event == NETDEV_POST_TYPE_CHANGE)
3226 ipv6_mc_remap(idev);
3227 else if (event == NETDEV_PRE_TYPE_CHANGE)
3228 ipv6_mc_unmap(idev);
3231 static int addrconf_ifdown(struct net_device *dev, int how)
3233 struct net *net = dev_net(dev);
3234 struct inet6_dev *idev;
3235 struct inet6_ifaddr *ifa;
3240 rt6_ifdown(net, dev);
3241 neigh_ifdown(&nd_tbl, dev);
3243 idev = __in6_dev_get(dev);
3248 * Step 1: remove reference to ipv6 device from parent device.
3254 /* protected by rtnl_lock */
3255 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3257 /* Step 1.5: remove snmp6 entry */
3258 snmp6_unregister_dev(idev);
3262 /* Step 2: clear hash table */
3263 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3264 struct hlist_head *h = &inet6_addr_lst[i];
3266 spin_lock_bh(&addrconf_hash_lock);
3268 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3269 if (ifa->idev == idev) {
3270 hlist_del_init_rcu(&ifa->addr_lst);
3271 addrconf_del_dad_work(ifa);
3275 spin_unlock_bh(&addrconf_hash_lock);
3278 write_lock_bh(&idev->lock);
3280 addrconf_del_rs_timer(idev);
3282 /* Step 2: clear flags for stateless addrconf */
3284 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3286 if (how && del_timer(&idev->regen_timer))
3289 /* Step 3: clear tempaddr list */
3290 while (!list_empty(&idev->tempaddr_list)) {
3291 ifa = list_first_entry(&idev->tempaddr_list,
3292 struct inet6_ifaddr, tmp_list);
3293 list_del(&ifa->tmp_list);
3294 write_unlock_bh(&idev->lock);
3295 spin_lock_bh(&ifa->lock);
3298 in6_ifa_put(ifa->ifpub);
3301 spin_unlock_bh(&ifa->lock);
3303 write_lock_bh(&idev->lock);
3306 while (!list_empty(&idev->addr_list)) {
3307 ifa = list_first_entry(&idev->addr_list,
3308 struct inet6_ifaddr, if_list);
3309 addrconf_del_dad_work(ifa);
3311 list_del(&ifa->if_list);
3313 write_unlock_bh(&idev->lock);
3315 spin_lock_bh(&ifa->lock);
3317 ifa->state = INET6_IFADDR_STATE_DEAD;
3318 spin_unlock_bh(&ifa->lock);
3320 if (state != INET6_IFADDR_STATE_DEAD) {
3321 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3322 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3326 write_lock_bh(&idev->lock);
3329 write_unlock_bh(&idev->lock);
3331 /* Step 5: Discard anycast and multicast list */
3333 ipv6_ac_destroy_dev(idev);
3334 ipv6_mc_destroy_dev(idev);
3339 idev->tstamp = jiffies;
3341 /* Last: Shot the device (if unregistered) */
3343 addrconf_sysctl_unregister(idev);
3344 neigh_parms_release(&nd_tbl, idev->nd_parms);
3345 neigh_ifdown(&nd_tbl, dev);
3351 static void addrconf_rs_timer(unsigned long data)
3353 struct inet6_dev *idev = (struct inet6_dev *)data;
3354 struct net_device *dev = idev->dev;
3355 struct in6_addr lladdr;
3357 write_lock(&idev->lock);
3358 if (idev->dead || !(idev->if_flags & IF_READY))
3361 if (!ipv6_accept_ra(idev))
3364 /* Announcement received after solicitation was sent */
3365 if (idev->if_flags & IF_RA_RCVD)
3368 if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
3369 write_unlock(&idev->lock);
3370 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3371 ndisc_send_rs(dev, &lladdr,
3372 &in6addr_linklocal_allrouters);
3376 write_lock(&idev->lock);
3377 /* The wait after the last probe can be shorter */
3378 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3379 idev->cnf.rtr_solicits) ?
3380 idev->cnf.rtr_solicit_delay :
3381 idev->cnf.rtr_solicit_interval);
3384 * Note: we do not support deprecated "all on-link"
3385 * assumption any longer.
3387 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3391 write_unlock(&idev->lock);
3397 * Duplicate Address Detection
3399 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3401 unsigned long rand_num;
3402 struct inet6_dev *idev = ifp->idev;
3404 if (ifp->flags & IFA_F_OPTIMISTIC)
3407 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3409 ifp->dad_probes = idev->cnf.dad_transmits;
3410 addrconf_mod_dad_work(ifp, rand_num);
3413 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3415 struct inet6_dev *idev = ifp->idev;
3416 struct net_device *dev = idev->dev;
3418 addrconf_join_solict(dev, &ifp->addr);
3420 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3422 read_lock_bh(&idev->lock);
3423 spin_lock(&ifp->lock);
3424 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3427 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3428 idev->cnf.accept_dad < 1 ||
3429 !(ifp->flags&IFA_F_TENTATIVE) ||
3430 ifp->flags & IFA_F_NODAD) {
3431 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3432 spin_unlock(&ifp->lock);
3433 read_unlock_bh(&idev->lock);
3435 addrconf_dad_completed(ifp);
3439 if (!(idev->if_flags & IF_READY)) {
3440 spin_unlock(&ifp->lock);
3441 read_unlock_bh(&idev->lock);
3443 * If the device is not ready:
3444 * - keep it tentative if it is a permanent address.
3445 * - otherwise, kill it.
3448 addrconf_dad_stop(ifp, 0);
3453 * Optimistic nodes can start receiving
3456 if (ifp->flags & IFA_F_OPTIMISTIC) {
3457 ip6_ins_rt(ifp->rt);
3458 if (ipv6_use_optimistic_addr(idev)) {
3459 /* Because optimistic nodes can use this address,
3460 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3462 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3466 addrconf_dad_kick(ifp);
3468 spin_unlock(&ifp->lock);
3469 read_unlock_bh(&idev->lock);
3472 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3474 bool begin_dad = false;
3476 spin_lock_bh(&ifp->lock);
3477 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3478 ifp->state = INET6_IFADDR_STATE_PREDAD;
3481 spin_unlock_bh(&ifp->lock);
3484 addrconf_mod_dad_work(ifp, 0);
3487 static void addrconf_dad_work(struct work_struct *w)
3489 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3490 struct inet6_ifaddr,
3492 struct inet6_dev *idev = ifp->idev;
3493 struct in6_addr mcaddr;
3499 } action = DAD_PROCESS;
3503 spin_lock_bh(&ifp->lock);
3504 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3506 ifp->state = INET6_IFADDR_STATE_DAD;
3507 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3509 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3511 spin_unlock_bh(&ifp->lock);
3513 if (action == DAD_BEGIN) {
3514 addrconf_dad_begin(ifp);
3516 } else if (action == DAD_ABORT) {
3517 addrconf_dad_stop(ifp, 1);
3521 if (!ifp->dad_probes && addrconf_dad_end(ifp))
3524 write_lock_bh(&idev->lock);
3525 if (idev->dead || !(idev->if_flags & IF_READY)) {
3526 write_unlock_bh(&idev->lock);
3530 spin_lock(&ifp->lock);
3531 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3532 spin_unlock(&ifp->lock);
3533 write_unlock_bh(&idev->lock);
3537 if (ifp->dad_probes == 0) {
3539 * DAD was successful
3542 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3543 spin_unlock(&ifp->lock);
3544 write_unlock_bh(&idev->lock);
3546 addrconf_dad_completed(ifp);
3552 addrconf_mod_dad_work(ifp,
3553 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
3554 spin_unlock(&ifp->lock);
3555 write_unlock_bh(&idev->lock);
3557 /* send a neighbour solicitation for our addr */
3558 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3559 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
3565 /* ifp->idev must be at least read locked */
3566 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3568 struct inet6_ifaddr *ifpiter;
3569 struct inet6_dev *idev = ifp->idev;
3571 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3572 if (ifpiter->scope > IFA_LINK)
3574 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3575 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3576 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3583 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3585 struct net_device *dev = ifp->idev->dev;
3586 struct in6_addr lladdr;
3587 bool send_rs, send_mld;
3589 addrconf_del_dad_work(ifp);
3592 * Configure the address for reception. Now it is valid.
3595 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3597 /* If added prefix is link local and we are prepared to process
3598 router advertisements, start sending router solicitations.
3601 read_lock_bh(&ifp->idev->lock);
3602 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
3603 send_rs = send_mld &&
3604 ipv6_accept_ra(ifp->idev) &&
3605 ifp->idev->cnf.rtr_solicits > 0 &&
3606 (dev->flags&IFF_LOOPBACK) == 0;
3607 read_unlock_bh(&ifp->idev->lock);
3609 /* While dad is in progress mld report's source address is in6_addrany.
3610 * Resend with proper ll now.
3613 ipv6_mc_dad_complete(ifp->idev);
3617 * If a host as already performed a random delay
3618 * [...] as part of DAD [...] there is no need
3619 * to delay again before sending the first RS
3621 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3623 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
3625 write_lock_bh(&ifp->idev->lock);
3626 spin_lock(&ifp->lock);
3627 ifp->idev->rs_probes = 1;
3628 ifp->idev->if_flags |= IF_RS_SENT;
3629 addrconf_mod_rs_timer(ifp->idev,
3630 ifp->idev->cnf.rtr_solicit_interval);
3631 spin_unlock(&ifp->lock);
3632 write_unlock_bh(&ifp->idev->lock);
3636 static void addrconf_dad_run(struct inet6_dev *idev)
3638 struct inet6_ifaddr *ifp;
3640 read_lock_bh(&idev->lock);
3641 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3642 spin_lock(&ifp->lock);
3643 if (ifp->flags & IFA_F_TENTATIVE &&
3644 ifp->state == INET6_IFADDR_STATE_DAD)
3645 addrconf_dad_kick(ifp);
3646 spin_unlock(&ifp->lock);
3648 read_unlock_bh(&idev->lock);
3651 #ifdef CONFIG_PROC_FS
3652 struct if6_iter_state {
3653 struct seq_net_private p;
3658 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3660 struct inet6_ifaddr *ifa = NULL;
3661 struct if6_iter_state *state = seq->private;
3662 struct net *net = seq_file_net(seq);
3665 /* initial bucket if pos is 0 */
3671 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3672 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
3674 if (!net_eq(dev_net(ifa->idev->dev), net))
3676 /* sync with offset */
3677 if (p < state->offset) {
3685 /* prepare for next bucket */
3692 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3693 struct inet6_ifaddr *ifa)
3695 struct if6_iter_state *state = seq->private;
3696 struct net *net = seq_file_net(seq);
3698 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
3699 if (!net_eq(dev_net(ifa->idev->dev), net))
3705 while (++state->bucket < IN6_ADDR_HSIZE) {
3707 hlist_for_each_entry_rcu_bh(ifa,
3708 &inet6_addr_lst[state->bucket], addr_lst) {
3709 if (!net_eq(dev_net(ifa->idev->dev), net))
3719 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3723 return if6_get_first(seq, *pos);
3726 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3728 struct inet6_ifaddr *ifa;
3730 ifa = if6_get_next(seq, v);
3735 static void if6_seq_stop(struct seq_file *seq, void *v)
3738 rcu_read_unlock_bh();
3741 static int if6_seq_show(struct seq_file *seq, void *v)
3743 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3744 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3746 ifp->idev->dev->ifindex,
3750 ifp->idev->dev->name);
3754 static const struct seq_operations if6_seq_ops = {
3755 .start = if6_seq_start,
3756 .next = if6_seq_next,
3757 .show = if6_seq_show,
3758 .stop = if6_seq_stop,
3761 static int if6_seq_open(struct inode *inode, struct file *file)
3763 return seq_open_net(inode, file, &if6_seq_ops,
3764 sizeof(struct if6_iter_state));
3767 static const struct file_operations if6_fops = {
3768 .owner = THIS_MODULE,
3769 .open = if6_seq_open,
3771 .llseek = seq_lseek,
3772 .release = seq_release_net,
3775 static int __net_init if6_proc_net_init(struct net *net)
3777 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
3782 static void __net_exit if6_proc_net_exit(struct net *net)
3784 remove_proc_entry("if_inet6", net->proc_net);
3787 static struct pernet_operations if6_proc_net_ops = {
3788 .init = if6_proc_net_init,
3789 .exit = if6_proc_net_exit,
3792 int __init if6_proc_init(void)
3794 return register_pernet_subsys(&if6_proc_net_ops);
3797 void if6_proc_exit(void)
3799 unregister_pernet_subsys(&if6_proc_net_ops);
3801 #endif /* CONFIG_PROC_FS */
3803 #if IS_ENABLED(CONFIG_IPV6_MIP6)
3804 /* Check if address is a home address configured on any interface. */
3805 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3808 struct inet6_ifaddr *ifp = NULL;
3809 unsigned int hash = inet6_addr_hash(addr);
3812 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
3813 if (!net_eq(dev_net(ifp->idev->dev), net))
3815 if (ipv6_addr_equal(&ifp->addr, addr) &&
3816 (ifp->flags & IFA_F_HOMEADDRESS)) {
3821 rcu_read_unlock_bh();
3827 * Periodic address status verification
3830 static void addrconf_verify_rtnl(void)
3832 unsigned long now, next, next_sec, next_sched;
3833 struct inet6_ifaddr *ifp;
3840 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3842 cancel_delayed_work(&addr_chk_work);
3844 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3846 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
3849 /* When setting preferred_lft to a value not zero or
3850 * infinity, while valid_lft is infinity
3851 * IFA_F_PERMANENT has a non-infinity life time.
3853 if ((ifp->flags & IFA_F_PERMANENT) &&
3854 (ifp->prefered_lft == INFINITY_LIFE_TIME))
3857 spin_lock(&ifp->lock);
3858 /* We try to batch several events at once. */
3859 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3861 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3862 age >= ifp->valid_lft) {
3863 spin_unlock(&ifp->lock);
3867 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3868 spin_unlock(&ifp->lock);
3870 } else if (age >= ifp->prefered_lft) {
3871 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3874 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3876 ifp->flags |= IFA_F_DEPRECATED;
3879 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
3880 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
3881 next = ifp->tstamp + ifp->valid_lft * HZ;
3883 spin_unlock(&ifp->lock);
3888 ipv6_ifa_notify(0, ifp);
3892 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3893 !(ifp->flags&IFA_F_TENTATIVE)) {
3894 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3895 ifp->idev->cnf.dad_transmits *
3896 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
3898 if (age >= ifp->prefered_lft - regen_advance) {
3899 struct inet6_ifaddr *ifpub = ifp->ifpub;
3900 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3901 next = ifp->tstamp + ifp->prefered_lft * HZ;
3902 if (!ifp->regen_count && ifpub) {
3905 in6_ifa_hold(ifpub);
3906 spin_unlock(&ifp->lock);
3908 spin_lock(&ifpub->lock);
3909 ifpub->regen_count = 0;
3910 spin_unlock(&ifpub->lock);
3911 ipv6_create_tempaddr(ifpub, ifp);
3916 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3917 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3918 spin_unlock(&ifp->lock);
3920 /* ifp->prefered_lft <= ifp->valid_lft */
3921 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3922 next = ifp->tstamp + ifp->prefered_lft * HZ;
3923 spin_unlock(&ifp->lock);
3928 next_sec = round_jiffies_up(next);
3931 /* If rounded timeout is accurate enough, accept it. */
3932 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3933 next_sched = next_sec;
3935 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3936 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3937 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3939 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3940 now, next, next_sec, next_sched);
3941 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
3942 rcu_read_unlock_bh();
3945 static void addrconf_verify_work(struct work_struct *w)
3948 addrconf_verify_rtnl();
3952 static void addrconf_verify(void)
3954 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
3957 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
3958 struct in6_addr **peer_pfx)
3960 struct in6_addr *pfx = NULL;
3965 pfx = nla_data(addr);
3968 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3970 pfx = nla_data(local);
3976 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3977 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3978 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3979 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3980 [IFA_FLAGS] = { .len = sizeof(u32) },
3984 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
3986 struct net *net = sock_net(skb->sk);
3987 struct ifaddrmsg *ifm;
3988 struct nlattr *tb[IFA_MAX+1];
3989 struct in6_addr *pfx, *peer_pfx;
3993 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3997 ifm = nlmsg_data(nlh);
3998 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4002 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4004 /* We ignore other flags so far. */
4005 ifa_flags &= IFA_F_MANAGETEMPADDR;
4007 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4008 ifm->ifa_prefixlen);
4011 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
4012 u32 prefered_lft, u32 valid_lft)
4016 unsigned long timeout;
4017 bool was_managetempaddr;
4018 bool had_prefixroute;
4022 if (!valid_lft || (prefered_lft > valid_lft))
4025 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4026 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4029 timeout = addrconf_timeout_fixup(valid_lft, HZ);
4030 if (addrconf_finite_timeout(timeout)) {
4031 expires = jiffies_to_clock_t(timeout * HZ);
4032 valid_lft = timeout;
4033 flags = RTF_EXPIRES;
4037 ifa_flags |= IFA_F_PERMANENT;
4040 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4041 if (addrconf_finite_timeout(timeout)) {
4043 ifa_flags |= IFA_F_DEPRECATED;
4044 prefered_lft = timeout;
4047 spin_lock_bh(&ifp->lock);
4048 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4049 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4050 !(ifp->flags & IFA_F_NOPREFIXROUTE);
4051 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4052 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4053 IFA_F_NOPREFIXROUTE);
4054 ifp->flags |= ifa_flags;
4055 ifp->tstamp = jiffies;
4056 ifp->valid_lft = valid_lft;
4057 ifp->prefered_lft = prefered_lft;
4059 spin_unlock_bh(&ifp->lock);
4060 if (!(ifp->flags&IFA_F_TENTATIVE))
4061 ipv6_ifa_notify(0, ifp);
4063 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4064 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4066 } else if (had_prefixroute) {
4067 enum cleanup_prefix_rt_t action;
4068 unsigned long rt_expires;
4070 write_lock_bh(&ifp->idev->lock);
4071 action = check_cleanup_prefix_route(ifp, &rt_expires);
4072 write_unlock_bh(&ifp->idev->lock);
4074 if (action != CLEANUP_PREFIX_RT_NOP) {
4075 cleanup_prefix_route(ifp, rt_expires,
4076 action == CLEANUP_PREFIX_RT_DEL);
4080 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4081 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4082 valid_lft = prefered_lft = 0;
4083 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4084 !was_managetempaddr, jiffies);
4087 addrconf_verify_rtnl();
4093 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
4095 struct net *net = sock_net(skb->sk);
4096 struct ifaddrmsg *ifm;
4097 struct nlattr *tb[IFA_MAX+1];
4098 struct in6_addr *pfx, *peer_pfx;
4099 struct inet6_ifaddr *ifa;
4100 struct net_device *dev;
4101 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
4105 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4109 ifm = nlmsg_data(nlh);
4110 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4114 if (tb[IFA_CACHEINFO]) {
4115 struct ifa_cacheinfo *ci;
4117 ci = nla_data(tb[IFA_CACHEINFO]);
4118 valid_lft = ci->ifa_valid;
4119 preferred_lft = ci->ifa_prefered;
4121 preferred_lft = INFINITY_LIFE_TIME;
4122 valid_lft = INFINITY_LIFE_TIME;
4125 dev = __dev_get_by_index(net, ifm->ifa_index);
4129 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4131 /* We ignore other flags so far. */
4132 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4133 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
4135 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
4138 * It would be best to check for !NLM_F_CREATE here but
4139 * userspace already relies on not having to provide this.
4141 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
4142 ifm->ifa_prefixlen, ifa_flags,
4143 preferred_lft, valid_lft);
4146 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4147 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4150 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
4157 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4158 u8 scope, int ifindex)
4160 struct ifaddrmsg *ifm;
4162 ifm = nlmsg_data(nlh);
4163 ifm->ifa_family = AF_INET6;
4164 ifm->ifa_prefixlen = prefixlen;
4165 ifm->ifa_flags = flags;
4166 ifm->ifa_scope = scope;
4167 ifm->ifa_index = ifindex;
4170 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4171 unsigned long tstamp, u32 preferred, u32 valid)
4173 struct ifa_cacheinfo ci;
4175 ci.cstamp = cstamp_delta(cstamp);
4176 ci.tstamp = cstamp_delta(tstamp);
4177 ci.ifa_prefered = preferred;
4178 ci.ifa_valid = valid;
4180 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4183 static inline int rt_scope(int ifa_scope)
4185 if (ifa_scope & IFA_HOST)
4186 return RT_SCOPE_HOST;
4187 else if (ifa_scope & IFA_LINK)
4188 return RT_SCOPE_LINK;
4189 else if (ifa_scope & IFA_SITE)
4190 return RT_SCOPE_SITE;
4192 return RT_SCOPE_UNIVERSE;
4195 static inline int inet6_ifaddr_msgsize(void)
4197 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4198 + nla_total_size(16) /* IFA_LOCAL */
4199 + nla_total_size(16) /* IFA_ADDRESS */
4200 + nla_total_size(sizeof(struct ifa_cacheinfo))
4201 + nla_total_size(4) /* IFA_FLAGS */;
4204 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
4205 u32 portid, u32 seq, int event, unsigned int flags)
4207 struct nlmsghdr *nlh;
4208 u32 preferred, valid;
4210 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4214 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4215 ifa->idev->dev->ifindex);
4217 if (!((ifa->flags&IFA_F_PERMANENT) &&
4218 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
4219 preferred = ifa->prefered_lft;
4220 valid = ifa->valid_lft;
4221 if (preferred != INFINITY_LIFE_TIME) {
4222 long tval = (jiffies - ifa->tstamp)/HZ;
4223 if (preferred > tval)
4227 if (valid != INFINITY_LIFE_TIME) {
4235 preferred = INFINITY_LIFE_TIME;
4236 valid = INFINITY_LIFE_TIME;
4239 if (!ipv6_addr_any(&ifa->peer_addr)) {
4240 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4241 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
4244 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
4247 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4250 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4253 nlmsg_end(skb, nlh);
4257 nlmsg_cancel(skb, nlh);
4261 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
4262 u32 portid, u32 seq, int event, u16 flags)
4264 struct nlmsghdr *nlh;
4265 u8 scope = RT_SCOPE_UNIVERSE;
4266 int ifindex = ifmca->idev->dev->ifindex;
4268 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4269 scope = RT_SCOPE_SITE;
4271 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4275 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4276 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
4277 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
4278 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4279 nlmsg_cancel(skb, nlh);
4283 nlmsg_end(skb, nlh);
4287 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
4288 u32 portid, u32 seq, int event, unsigned int flags)
4290 struct nlmsghdr *nlh;
4291 u8 scope = RT_SCOPE_UNIVERSE;
4292 int ifindex = ifaca->aca_idev->dev->ifindex;
4294 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4295 scope = RT_SCOPE_SITE;
4297 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4301 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4302 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
4303 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
4304 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4305 nlmsg_cancel(skb, nlh);
4309 nlmsg_end(skb, nlh);
4319 /* called with rcu_read_lock() */
4320 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4321 struct netlink_callback *cb, enum addr_type_t type,
4322 int s_ip_idx, int *p_ip_idx)
4324 struct ifmcaddr6 *ifmca;
4325 struct ifacaddr6 *ifaca;
4327 int ip_idx = *p_ip_idx;
4329 read_lock_bh(&idev->lock);
4331 case UNICAST_ADDR: {
4332 struct inet6_ifaddr *ifa;
4334 /* unicast address incl. temp addr */
4335 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4336 if (++ip_idx < s_ip_idx)
4338 err = inet6_fill_ifaddr(skb, ifa,
4339 NETLINK_CB(cb->skb).portid,
4345 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4349 case MULTICAST_ADDR:
4350 /* multicast address */
4351 for (ifmca = idev->mc_list; ifmca;
4352 ifmca = ifmca->next, ip_idx++) {
4353 if (ip_idx < s_ip_idx)
4355 err = inet6_fill_ifmcaddr(skb, ifmca,
4356 NETLINK_CB(cb->skb).portid,
4365 /* anycast address */
4366 for (ifaca = idev->ac_list; ifaca;
4367 ifaca = ifaca->aca_next, ip_idx++) {
4368 if (ip_idx < s_ip_idx)
4370 err = inet6_fill_ifacaddr(skb, ifaca,
4371 NETLINK_CB(cb->skb).portid,
4382 read_unlock_bh(&idev->lock);
4387 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4388 enum addr_type_t type)
4390 struct net *net = sock_net(skb->sk);
4393 int s_idx, s_ip_idx;
4394 struct net_device *dev;
4395 struct inet6_dev *idev;
4396 struct hlist_head *head;
4399 s_idx = idx = cb->args[1];
4400 s_ip_idx = ip_idx = cb->args[2];
4403 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4404 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4406 head = &net->dev_index_head[h];
4407 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4410 if (h > s_h || idx > s_idx)
4413 idev = __in6_dev_get(dev);
4417 if (in6_dump_addrs(idev, skb, cb, type,
4418 s_ip_idx, &ip_idx) < 0)
4428 cb->args[2] = ip_idx;
4433 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4435 enum addr_type_t type = UNICAST_ADDR;
4437 return inet6_dump_addr(skb, cb, type);
4440 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4442 enum addr_type_t type = MULTICAST_ADDR;
4444 return inet6_dump_addr(skb, cb, type);
4448 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4450 enum addr_type_t type = ANYCAST_ADDR;
4452 return inet6_dump_addr(skb, cb, type);
4455 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
4457 struct net *net = sock_net(in_skb->sk);
4458 struct ifaddrmsg *ifm;
4459 struct nlattr *tb[IFA_MAX+1];
4460 struct in6_addr *addr = NULL, *peer;
4461 struct net_device *dev = NULL;
4462 struct inet6_ifaddr *ifa;
4463 struct sk_buff *skb;
4466 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4470 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4476 ifm = nlmsg_data(nlh);
4478 dev = __dev_get_by_index(net, ifm->ifa_index);
4480 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4482 err = -EADDRNOTAVAIL;
4486 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4492 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4493 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4495 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4496 WARN_ON(err == -EMSGSIZE);
4500 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4507 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4509 struct sk_buff *skb;
4510 struct net *net = dev_net(ifa->idev->dev);
4513 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4517 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4519 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4520 WARN_ON(err == -EMSGSIZE);
4524 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4528 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4531 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4532 __s32 *array, int bytes)
4534 BUG_ON(bytes < (DEVCONF_MAX * 4));
4536 memset(array, 0, bytes);
4537 array[DEVCONF_FORWARDING] = cnf->forwarding;
4538 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4539 array[DEVCONF_MTU6] = cnf->mtu6;
4540 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4541 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4542 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4543 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4544 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4545 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4546 jiffies_to_msecs(cnf->rtr_solicit_interval);
4547 array[DEVCONF_RTR_SOLICIT_DELAY] =
4548 jiffies_to_msecs(cnf->rtr_solicit_delay);
4549 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4550 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4551 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4552 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4553 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
4554 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4555 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4556 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4557 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4558 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4559 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4560 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4561 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4562 #ifdef CONFIG_IPV6_ROUTER_PREF
4563 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4564 array[DEVCONF_RTR_PROBE_INTERVAL] =
4565 jiffies_to_msecs(cnf->rtr_probe_interval);
4566 #ifdef CONFIG_IPV6_ROUTE_INFO
4567 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4570 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4571 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4572 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4573 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4574 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
4576 #ifdef CONFIG_IPV6_MROUTE
4577 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4579 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4580 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4581 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4582 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4583 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
4584 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
4585 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
4586 /* we omit DEVCONF_STABLE_SECRET for now */
4589 static inline size_t inet6_ifla6_size(void)
4591 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4592 + nla_total_size(sizeof(struct ifla_cacheinfo))
4593 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4594 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4595 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4596 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
4599 static inline size_t inet6_if_nlmsg_size(void)
4601 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4602 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4603 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4604 + nla_total_size(4) /* IFLA_MTU */
4605 + nla_total_size(4) /* IFLA_LINK */
4606 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4609 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4610 int items, int bytes)
4613 int pad = bytes - sizeof(u64) * items;
4616 /* Use put_unaligned() because stats may not be aligned for u64. */
4617 put_unaligned(items, &stats[0]);
4618 for (i = 1; i < items; i++)
4619 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4621 memset(&stats[items], 0, pad);
4624 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
4625 int items, int bytes, size_t syncpoff)
4628 int pad = bytes - sizeof(u64) * items;
4631 /* Use put_unaligned() because stats may not be aligned for u64. */
4632 put_unaligned(items, &stats[0]);
4633 for (i = 1; i < items; i++)
4634 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4636 memset(&stats[items], 0, pad);
4639 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4643 case IFLA_INET6_STATS:
4644 __snmp6_fill_stats64(stats, idev->stats.ipv6,
4645 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
4647 case IFLA_INET6_ICMP6STATS:
4648 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
4653 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4656 struct ifla_cacheinfo ci;
4658 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4659 goto nla_put_failure;
4660 ci.max_reasm_len = IPV6_MAXPLEN;
4661 ci.tstamp = cstamp_delta(idev->tstamp);
4662 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4663 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
4664 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4665 goto nla_put_failure;
4666 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4668 goto nla_put_failure;
4669 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4671 /* XXX - MC not implemented */
4673 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4675 goto nla_put_failure;
4676 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4678 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4680 goto nla_put_failure;
4681 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4683 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4685 goto nla_put_failure;
4687 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode))
4688 goto nla_put_failure;
4690 read_lock_bh(&idev->lock);
4691 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4692 read_unlock_bh(&idev->lock);
4700 static size_t inet6_get_link_af_size(const struct net_device *dev)
4702 if (!__in6_dev_get(dev))
4705 return inet6_ifla6_size();
4708 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4710 struct inet6_dev *idev = __in6_dev_get(dev);
4715 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4721 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4723 struct inet6_ifaddr *ifp;
4724 struct net_device *dev = idev->dev;
4725 bool update_rs = false;
4726 struct in6_addr ll_addr;
4732 if (ipv6_addr_any(token))
4734 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4736 if (!ipv6_accept_ra(idev))
4738 if (idev->cnf.rtr_solicits <= 0)
4741 write_lock_bh(&idev->lock);
4743 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4744 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4746 write_unlock_bh(&idev->lock);
4748 if (!idev->dead && (idev->if_flags & IF_READY) &&
4749 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4750 IFA_F_OPTIMISTIC)) {
4752 /* If we're not ready, then normal ifup will take care
4753 * of this. Otherwise, we need to request our rs here.
4755 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4759 write_lock_bh(&idev->lock);
4762 idev->if_flags |= IF_RS_SENT;
4763 idev->rs_probes = 1;
4764 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
4767 /* Well, that's kinda nasty ... */
4768 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4769 spin_lock(&ifp->lock);
4770 if (ifp->tokenized) {
4772 ifp->prefered_lft = 0;
4774 spin_unlock(&ifp->lock);
4777 write_unlock_bh(&idev->lock);
4778 inet6_ifinfo_notify(RTM_NEWLINK, idev);
4779 addrconf_verify_rtnl();
4783 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
4784 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
4785 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
4788 static int inet6_validate_link_af(const struct net_device *dev,
4789 const struct nlattr *nla)
4791 struct nlattr *tb[IFLA_INET6_MAX + 1];
4793 if (dev && !__in6_dev_get(dev))
4794 return -EAFNOSUPPORT;
4796 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy);
4799 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4802 struct inet6_dev *idev = __in6_dev_get(dev);
4803 struct nlattr *tb[IFLA_INET6_MAX + 1];
4806 return -EAFNOSUPPORT;
4808 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4811 if (tb[IFLA_INET6_TOKEN]) {
4812 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
4817 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
4818 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
4820 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
4821 mode != IN6_ADDR_GEN_MODE_NONE &&
4822 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY)
4825 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
4826 !idev->cnf.stable_secret.initialized &&
4827 !dev_net(dev)->ipv6.devconf_dflt->stable_secret.initialized)
4830 idev->addr_gen_mode = mode;
4837 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4838 u32 portid, u32 seq, int event, unsigned int flags)
4840 struct net_device *dev = idev->dev;
4841 struct ifinfomsg *hdr;
4842 struct nlmsghdr *nlh;
4845 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
4849 hdr = nlmsg_data(nlh);
4850 hdr->ifi_family = AF_INET6;
4852 hdr->ifi_type = dev->type;
4853 hdr->ifi_index = dev->ifindex;
4854 hdr->ifi_flags = dev_get_flags(dev);
4855 hdr->ifi_change = 0;
4857 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4859 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4860 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4861 (dev->ifindex != dev_get_iflink(dev) &&
4862 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))))
4863 goto nla_put_failure;
4864 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4866 goto nla_put_failure;
4868 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4869 goto nla_put_failure;
4871 nla_nest_end(skb, protoinfo);
4872 nlmsg_end(skb, nlh);
4876 nlmsg_cancel(skb, nlh);
4880 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4882 struct net *net = sock_net(skb->sk);
4885 struct net_device *dev;
4886 struct inet6_dev *idev;
4887 struct hlist_head *head;
4890 s_idx = cb->args[1];
4893 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4895 head = &net->dev_index_head[h];
4896 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4899 idev = __in6_dev_get(dev);
4902 if (inet6_fill_ifinfo(skb, idev,
4903 NETLINK_CB(cb->skb).portid,
4905 RTM_NEWLINK, NLM_F_MULTI) < 0)
4919 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4921 struct sk_buff *skb;
4922 struct net *net = dev_net(idev->dev);
4925 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4929 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4931 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4932 WARN_ON(err == -EMSGSIZE);
4936 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4940 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4943 static inline size_t inet6_prefix_nlmsg_size(void)
4945 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4946 + nla_total_size(sizeof(struct in6_addr))
4947 + nla_total_size(sizeof(struct prefix_cacheinfo));
4950 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4951 struct prefix_info *pinfo, u32 portid, u32 seq,
4952 int event, unsigned int flags)
4954 struct prefixmsg *pmsg;
4955 struct nlmsghdr *nlh;
4956 struct prefix_cacheinfo ci;
4958 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
4962 pmsg = nlmsg_data(nlh);
4963 pmsg->prefix_family = AF_INET6;
4964 pmsg->prefix_pad1 = 0;
4965 pmsg->prefix_pad2 = 0;
4966 pmsg->prefix_ifindex = idev->dev->ifindex;
4967 pmsg->prefix_len = pinfo->prefix_len;
4968 pmsg->prefix_type = pinfo->type;
4969 pmsg->prefix_pad3 = 0;
4970 pmsg->prefix_flags = 0;
4972 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4973 if (pinfo->autoconf)
4974 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4976 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4977 goto nla_put_failure;
4978 ci.preferred_time = ntohl(pinfo->prefered);
4979 ci.valid_time = ntohl(pinfo->valid);
4980 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4981 goto nla_put_failure;
4982 nlmsg_end(skb, nlh);
4986 nlmsg_cancel(skb, nlh);
4990 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4991 struct prefix_info *pinfo)
4993 struct sk_buff *skb;
4994 struct net *net = dev_net(idev->dev);
4997 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
5001 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
5003 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5004 WARN_ON(err == -EMSGSIZE);
5008 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5012 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
5015 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5017 struct net *net = dev_net(ifp->idev->dev);
5022 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5027 * If the address was optimistic
5028 * we inserted the route at the start of
5029 * our DAD process, so we don't need
5032 if (!(ifp->rt->rt6i_node))
5033 ip6_ins_rt(ifp->rt);
5034 if (ifp->idev->cnf.forwarding)
5035 addrconf_join_anycast(ifp);
5036 if (!ipv6_addr_any(&ifp->peer_addr))
5037 addrconf_prefix_route(&ifp->peer_addr, 128,
5038 ifp->idev->dev, 0, 0);
5041 if (ifp->idev->cnf.forwarding)
5042 addrconf_leave_anycast(ifp);
5043 addrconf_leave_solict(ifp->idev, &ifp->addr);
5044 if (!ipv6_addr_any(&ifp->peer_addr)) {
5045 struct rt6_info *rt;
5047 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5048 ifp->idev->dev, 0, 0);
5049 if (rt && ip6_del_rt(rt))
5052 dst_hold(&ifp->rt->dst);
5054 if (ip6_del_rt(ifp->rt))
5055 dst_free(&ifp->rt->dst);
5057 rt_genid_bump_ipv6(net);
5060 atomic_inc(&net->ipv6.dev_addr_genid);
5063 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5066 if (likely(ifp->idev->dead == 0))
5067 __ipv6_ifa_notify(event, ifp);
5068 rcu_read_unlock_bh();
5071 #ifdef CONFIG_SYSCTL
5074 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
5075 void __user *buffer, size_t *lenp, loff_t *ppos)
5077 int *valp = ctl->data;
5080 struct ctl_table lctl;
5084 * ctl->data points to idev->cnf.forwarding, we should
5085 * not modify it until we get the rtnl lock.
5090 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5093 ret = addrconf_fixup_forwarding(ctl, valp, val);
5100 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5101 void __user *buffer, size_t *lenp, loff_t *ppos)
5103 struct inet6_dev *idev = ctl->extra1;
5104 int min_mtu = IPV6_MIN_MTU;
5105 struct ctl_table lctl;
5108 lctl.extra1 = &min_mtu;
5109 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5111 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5114 static void dev_disable_change(struct inet6_dev *idev)
5116 struct netdev_notifier_info info;
5118 if (!idev || !idev->dev)
5121 netdev_notifier_info_init(&info, idev->dev);
5122 if (idev->cnf.disable_ipv6)
5123 addrconf_notify(NULL, NETDEV_DOWN, &info);
5125 addrconf_notify(NULL, NETDEV_UP, &info);
5128 static void addrconf_disable_change(struct net *net, __s32 newf)
5130 struct net_device *dev;
5131 struct inet6_dev *idev;
5134 for_each_netdev_rcu(net, dev) {
5135 idev = __in6_dev_get(dev);
5137 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5138 idev->cnf.disable_ipv6 = newf;
5140 dev_disable_change(idev);
5146 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
5151 if (!rtnl_trylock())
5152 return restart_syscall();
5154 net = (struct net *)table->extra2;
5158 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5163 if (p == &net->ipv6.devconf_all->disable_ipv6) {
5164 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5165 addrconf_disable_change(net, newf);
5166 } else if ((!newf) ^ (!old))
5167 dev_disable_change((struct inet6_dev *)table->extra1);
5174 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
5175 void __user *buffer, size_t *lenp, loff_t *ppos)
5177 int *valp = ctl->data;
5180 struct ctl_table lctl;
5184 * ctl->data points to idev->cnf.disable_ipv6, we should
5185 * not modify it until we get the rtnl lock.
5190 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5193 ret = addrconf_disable_ipv6(ctl, valp, val);
5200 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5201 void __user *buffer, size_t *lenp, loff_t *ppos)
5203 int *valp = ctl->data;
5208 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5211 if (write && old != new) {
5212 struct net *net = ctl->extra2;
5214 if (!rtnl_trylock())
5215 return restart_syscall();
5217 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5218 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5219 NETCONFA_IFINDEX_DEFAULT,
5220 net->ipv6.devconf_dflt);
5221 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5222 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5223 NETCONFA_IFINDEX_ALL,
5224 net->ipv6.devconf_all);
5226 struct inet6_dev *idev = ctl->extra1;
5228 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5238 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5239 void __user *buffer, size_t *lenp,
5243 struct in6_addr addr;
5244 char str[IPV6_MAX_STRLEN];
5245 struct ctl_table lctl = *ctl;
5246 struct net *net = ctl->extra2;
5247 struct ipv6_stable_secret *secret = ctl->data;
5249 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5252 lctl.maxlen = IPV6_MAX_STRLEN;
5255 if (!rtnl_trylock())
5256 return restart_syscall();
5258 if (!write && !secret->initialized) {
5264 err = snprintf(str, sizeof(str), "%pI6",
5266 if (err >= sizeof(str)) {
5272 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5276 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5281 secret->initialized = true;
5282 secret->secret = addr;
5284 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5285 struct net_device *dev;
5287 for_each_netdev(net, dev) {
5288 struct inet6_dev *idev = __in6_dev_get(dev);
5291 idev->addr_gen_mode =
5292 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5296 struct inet6_dev *idev = ctl->extra1;
5298 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5307 static struct addrconf_sysctl_table
5309 struct ctl_table_header *sysctl_header;
5310 struct ctl_table addrconf_vars[DEVCONF_MAX+1];
5311 } addrconf_sysctl __read_mostly = {
5312 .sysctl_header = NULL,
5315 .procname = "forwarding",
5316 .data = &ipv6_devconf.forwarding,
5317 .maxlen = sizeof(int),
5319 .proc_handler = addrconf_sysctl_forward,
5322 .procname = "hop_limit",
5323 .data = &ipv6_devconf.hop_limit,
5324 .maxlen = sizeof(int),
5326 .proc_handler = proc_dointvec,
5330 .data = &ipv6_devconf.mtu6,
5331 .maxlen = sizeof(int),
5333 .proc_handler = addrconf_sysctl_mtu,
5336 .procname = "accept_ra",
5337 .data = &ipv6_devconf.accept_ra,
5338 .maxlen = sizeof(int),
5340 .proc_handler = proc_dointvec,
5343 .procname = "accept_redirects",
5344 .data = &ipv6_devconf.accept_redirects,
5345 .maxlen = sizeof(int),
5347 .proc_handler = proc_dointvec,
5350 .procname = "autoconf",
5351 .data = &ipv6_devconf.autoconf,
5352 .maxlen = sizeof(int),
5354 .proc_handler = proc_dointvec,
5357 .procname = "dad_transmits",
5358 .data = &ipv6_devconf.dad_transmits,
5359 .maxlen = sizeof(int),
5361 .proc_handler = proc_dointvec,
5364 .procname = "router_solicitations",
5365 .data = &ipv6_devconf.rtr_solicits,
5366 .maxlen = sizeof(int),
5368 .proc_handler = proc_dointvec,
5371 .procname = "router_solicitation_interval",
5372 .data = &ipv6_devconf.rtr_solicit_interval,
5373 .maxlen = sizeof(int),
5375 .proc_handler = proc_dointvec_jiffies,
5378 .procname = "router_solicitation_delay",
5379 .data = &ipv6_devconf.rtr_solicit_delay,
5380 .maxlen = sizeof(int),
5382 .proc_handler = proc_dointvec_jiffies,
5385 .procname = "force_mld_version",
5386 .data = &ipv6_devconf.force_mld_version,
5387 .maxlen = sizeof(int),
5389 .proc_handler = proc_dointvec,
5392 .procname = "mldv1_unsolicited_report_interval",
5394 &ipv6_devconf.mldv1_unsolicited_report_interval,
5395 .maxlen = sizeof(int),
5397 .proc_handler = proc_dointvec_ms_jiffies,
5400 .procname = "mldv2_unsolicited_report_interval",
5402 &ipv6_devconf.mldv2_unsolicited_report_interval,
5403 .maxlen = sizeof(int),
5405 .proc_handler = proc_dointvec_ms_jiffies,
5408 .procname = "use_tempaddr",
5409 .data = &ipv6_devconf.use_tempaddr,
5410 .maxlen = sizeof(int),
5412 .proc_handler = proc_dointvec,
5415 .procname = "temp_valid_lft",
5416 .data = &ipv6_devconf.temp_valid_lft,
5417 .maxlen = sizeof(int),
5419 .proc_handler = proc_dointvec,
5422 .procname = "temp_prefered_lft",
5423 .data = &ipv6_devconf.temp_prefered_lft,
5424 .maxlen = sizeof(int),
5426 .proc_handler = proc_dointvec,
5429 .procname = "regen_max_retry",
5430 .data = &ipv6_devconf.regen_max_retry,
5431 .maxlen = sizeof(int),
5433 .proc_handler = proc_dointvec,
5436 .procname = "max_desync_factor",
5437 .data = &ipv6_devconf.max_desync_factor,
5438 .maxlen = sizeof(int),
5440 .proc_handler = proc_dointvec,
5443 .procname = "max_addresses",
5444 .data = &ipv6_devconf.max_addresses,
5445 .maxlen = sizeof(int),
5447 .proc_handler = proc_dointvec,
5450 .procname = "accept_ra_defrtr",
5451 .data = &ipv6_devconf.accept_ra_defrtr,
5452 .maxlen = sizeof(int),
5454 .proc_handler = proc_dointvec,
5457 .procname = "accept_ra_pinfo",
5458 .data = &ipv6_devconf.accept_ra_pinfo,
5459 .maxlen = sizeof(int),
5461 .proc_handler = proc_dointvec,
5463 #ifdef CONFIG_IPV6_ROUTER_PREF
5465 .procname = "accept_ra_rtr_pref",
5466 .data = &ipv6_devconf.accept_ra_rtr_pref,
5467 .maxlen = sizeof(int),
5469 .proc_handler = proc_dointvec,
5472 .procname = "router_probe_interval",
5473 .data = &ipv6_devconf.rtr_probe_interval,
5474 .maxlen = sizeof(int),
5476 .proc_handler = proc_dointvec_jiffies,
5478 #ifdef CONFIG_IPV6_ROUTE_INFO
5480 .procname = "accept_ra_rt_info_max_plen",
5481 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
5482 .maxlen = sizeof(int),
5484 .proc_handler = proc_dointvec,
5489 .procname = "proxy_ndp",
5490 .data = &ipv6_devconf.proxy_ndp,
5491 .maxlen = sizeof(int),
5493 .proc_handler = addrconf_sysctl_proxy_ndp,
5496 .procname = "accept_source_route",
5497 .data = &ipv6_devconf.accept_source_route,
5498 .maxlen = sizeof(int),
5500 .proc_handler = proc_dointvec,
5502 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5504 .procname = "optimistic_dad",
5505 .data = &ipv6_devconf.optimistic_dad,
5506 .maxlen = sizeof(int),
5508 .proc_handler = proc_dointvec,
5512 .procname = "use_optimistic",
5513 .data = &ipv6_devconf.use_optimistic,
5514 .maxlen = sizeof(int),
5516 .proc_handler = proc_dointvec,
5520 #ifdef CONFIG_IPV6_MROUTE
5522 .procname = "mc_forwarding",
5523 .data = &ipv6_devconf.mc_forwarding,
5524 .maxlen = sizeof(int),
5526 .proc_handler = proc_dointvec,
5530 .procname = "disable_ipv6",
5531 .data = &ipv6_devconf.disable_ipv6,
5532 .maxlen = sizeof(int),
5534 .proc_handler = addrconf_sysctl_disable,
5537 .procname = "accept_dad",
5538 .data = &ipv6_devconf.accept_dad,
5539 .maxlen = sizeof(int),
5541 .proc_handler = proc_dointvec,
5544 .procname = "force_tllao",
5545 .data = &ipv6_devconf.force_tllao,
5546 .maxlen = sizeof(int),
5548 .proc_handler = proc_dointvec
5551 .procname = "ndisc_notify",
5552 .data = &ipv6_devconf.ndisc_notify,
5553 .maxlen = sizeof(int),
5555 .proc_handler = proc_dointvec
5558 .procname = "suppress_frag_ndisc",
5559 .data = &ipv6_devconf.suppress_frag_ndisc,
5560 .maxlen = sizeof(int),
5562 .proc_handler = proc_dointvec
5565 .procname = "accept_ra_from_local",
5566 .data = &ipv6_devconf.accept_ra_from_local,
5567 .maxlen = sizeof(int),
5569 .proc_handler = proc_dointvec,
5572 .procname = "accept_ra_mtu",
5573 .data = &ipv6_devconf.accept_ra_mtu,
5574 .maxlen = sizeof(int),
5576 .proc_handler = proc_dointvec,
5579 .procname = "stable_secret",
5580 .data = &ipv6_devconf.stable_secret,
5581 .maxlen = IPV6_MAX_STRLEN,
5583 .proc_handler = addrconf_sysctl_stable_secret,
5591 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
5592 struct inet6_dev *idev, struct ipv6_devconf *p)
5595 struct addrconf_sysctl_table *t;
5596 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
5598 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
5602 for (i = 0; t->addrconf_vars[i].data; i++) {
5603 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
5604 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
5605 t->addrconf_vars[i].extra2 = net;
5608 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
5610 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
5611 if (!t->sysctl_header)
5623 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5625 struct addrconf_sysctl_table *t;
5632 unregister_net_sysctl_table(t->sysctl_header);
5636 static int addrconf_sysctl_register(struct inet6_dev *idev)
5640 if (!sysctl_dev_name_is_allowed(idev->dev->name))
5643 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
5644 &ndisc_ifinfo_sysctl_change);
5647 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
5650 neigh_sysctl_unregister(idev->nd_parms);
5655 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
5657 __addrconf_sysctl_unregister(&idev->cnf);
5658 neigh_sysctl_unregister(idev->nd_parms);
5664 static int __net_init addrconf_init_net(struct net *net)
5667 struct ipv6_devconf *all, *dflt;
5669 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
5673 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
5675 goto err_alloc_dflt;
5677 /* these will be inherited by all namespaces */
5678 dflt->autoconf = ipv6_defaults.autoconf;
5679 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
5681 dflt->stable_secret.initialized = false;
5682 all->stable_secret.initialized = false;
5684 net->ipv6.devconf_all = all;
5685 net->ipv6.devconf_dflt = dflt;
5687 #ifdef CONFIG_SYSCTL
5688 err = __addrconf_sysctl_register(net, "all", NULL, all);
5692 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
5698 #ifdef CONFIG_SYSCTL
5700 __addrconf_sysctl_unregister(all);
5710 static void __net_exit addrconf_exit_net(struct net *net)
5712 #ifdef CONFIG_SYSCTL
5713 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5714 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5716 kfree(net->ipv6.devconf_dflt);
5717 kfree(net->ipv6.devconf_all);
5720 static struct pernet_operations addrconf_ops = {
5721 .init = addrconf_init_net,
5722 .exit = addrconf_exit_net,
5725 static struct rtnl_af_ops inet6_ops __read_mostly = {
5727 .fill_link_af = inet6_fill_link_af,
5728 .get_link_af_size = inet6_get_link_af_size,
5729 .validate_link_af = inet6_validate_link_af,
5730 .set_link_af = inet6_set_link_af,
5734 * Init / cleanup code
5737 int __init addrconf_init(void)
5739 struct inet6_dev *idev;
5742 err = ipv6_addr_label_init();
5744 pr_crit("%s: cannot initialize default policy table: %d\n",
5749 err = register_pernet_subsys(&addrconf_ops);
5753 addrconf_wq = create_workqueue("ipv6_addrconf");
5759 /* The addrconf netdev notifier requires that loopback_dev
5760 * has it's ipv6 private information allocated and setup
5761 * before it can bring up and give link-local addresses
5762 * to other devices which are up.
5764 * Unfortunately, loopback_dev is not necessarily the first
5765 * entry in the global dev_base list of net devices. In fact,
5766 * it is likely to be the very last entry on that list.
5767 * So this causes the notifier registry below to try and
5768 * give link-local addresses to all devices besides loopback_dev
5769 * first, then loopback_dev, which cases all the non-loopback_dev
5770 * devices to fail to get a link-local address.
5772 * So, as a temporary fix, allocate the ipv6 structure for
5773 * loopback_dev first by hand.
5774 * Longer term, all of the dependencies ipv6 has upon the loopback
5775 * device and it being up should be removed.
5778 idev = ipv6_add_dev(init_net.loopback_dev);
5781 err = PTR_ERR(idev);
5785 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5786 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5788 register_netdevice_notifier(&ipv6_dev_notf);
5792 rtnl_af_register(&inet6_ops);
5794 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5799 /* Only the first call to __rtnl_register can fail */
5800 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5801 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5802 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5803 inet6_dump_ifaddr, NULL);
5804 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5805 inet6_dump_ifmcaddr, NULL);
5806 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5807 inet6_dump_ifacaddr, NULL);
5808 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
5809 inet6_netconf_dump_devconf, NULL);
5811 ipv6_addr_label_rtnl_register();
5815 rtnl_af_unregister(&inet6_ops);
5816 unregister_netdevice_notifier(&ipv6_dev_notf);
5818 destroy_workqueue(addrconf_wq);
5820 unregister_pernet_subsys(&addrconf_ops);
5822 ipv6_addr_label_cleanup();
5827 void addrconf_cleanup(void)
5829 struct net_device *dev;
5832 unregister_netdevice_notifier(&ipv6_dev_notf);
5833 unregister_pernet_subsys(&addrconf_ops);
5834 ipv6_addr_label_cleanup();
5838 __rtnl_af_unregister(&inet6_ops);
5840 /* clean dev list */
5841 for_each_netdev(&init_net, dev) {
5842 if (__in6_dev_get(dev) == NULL)
5844 addrconf_ifdown(dev, 1);
5846 addrconf_ifdown(init_net.loopback_dev, 2);
5851 spin_lock_bh(&addrconf_hash_lock);
5852 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5853 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5854 spin_unlock_bh(&addrconf_hash_lock);
5855 cancel_delayed_work(&addr_chk_work);
5858 destroy_workqueue(addrconf_wq);