2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
6 * Pedro Roque <roque@di.fc.ul.pt>
7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
25 * yoshfuji@USAGI : Fixed interval between DAD
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
41 #define pr_fmt(fmt) "IPv6: " fmt
43 #include <linux/errno.h>
44 #include <linux/types.h>
45 #include <linux/kernel.h>
46 #include <linux/socket.h>
47 #include <linux/sockios.h>
48 #include <linux/net.h>
49 #include <linux/in6.h>
50 #include <linux/netdevice.h>
51 #include <linux/if_addr.h>
52 #include <linux/if_arp.h>
53 #include <linux/if_arcnet.h>
54 #include <linux/if_infiniband.h>
55 #include <linux/route.h>
56 #include <linux/inetdevice.h>
57 #include <linux/init.h>
58 #include <linux/slab.h>
60 #include <linux/sysctl.h>
62 #include <linux/capability.h>
63 #include <linux/delay.h>
64 #include <linux/notifier.h>
65 #include <linux/string.h>
66 #include <linux/hash.h>
68 #include <net/net_namespace.h>
72 #include <net/af_ieee802154.h>
73 #include <net/firewire.h>
75 #include <net/protocol.h>
76 #include <net/ndisc.h>
77 #include <net/ip6_route.h>
78 #include <net/addrconf.h>
81 #include <net/netlink.h>
82 #include <net/pkt_sched.h>
83 #include <linux/if_tunnel.h>
84 #include <linux/rtnetlink.h>
85 #include <linux/netconf.h>
87 #ifdef CONFIG_IPV6_PRIVACY
88 #include <linux/random.h>
91 #include <linux/uaccess.h>
92 #include <asm/unaligned.h>
94 #include <linux/proc_fs.h>
95 #include <linux/seq_file.h>
96 #include <linux/export.h>
98 /* Set to 3 to get tracing... */
102 #define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
104 #define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
107 #define INFINITY_LIFE_TIME 0xFFFFFFFF
109 static inline u32 cstamp_delta(unsigned long cstamp)
111 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
115 static void addrconf_sysctl_register(struct inet6_dev *idev);
116 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
118 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
122 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
127 #ifdef CONFIG_IPV6_PRIVACY
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);
133 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
134 static int ipv6_count_addresses(struct inet6_dev *idev);
137 * Configured unicast address hash table
139 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
140 static DEFINE_SPINLOCK(addrconf_hash_lock);
142 static void addrconf_verify(unsigned long);
144 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
145 static DEFINE_SPINLOCK(addrconf_verify_lock);
147 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
148 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
150 static void addrconf_type_change(struct net_device *dev,
151 unsigned long event);
152 static int addrconf_ifdown(struct net_device *dev, int how);
154 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
156 const struct net_device *dev,
157 u32 flags, u32 noflags);
159 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
160 static void addrconf_dad_timer(unsigned long data);
161 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
162 static void addrconf_dad_run(struct inet6_dev *idev);
163 static void addrconf_rs_timer(unsigned long data);
164 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
165 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
167 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
168 struct prefix_info *pinfo);
169 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
170 struct net_device *dev);
172 static struct ipv6_devconf ipv6_devconf __read_mostly = {
174 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
175 .mtu6 = IPV6_MIN_MTU,
177 .accept_redirects = 1,
179 .force_mld_version = 0,
180 .mldv1_unsolicited_report_interval = 10 * HZ,
181 .mldv2_unsolicited_report_interval = HZ,
183 .rtr_solicits = MAX_RTR_SOLICITATIONS,
184 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
185 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
186 #ifdef CONFIG_IPV6_PRIVACY
188 .temp_valid_lft = TEMP_VALID_LIFETIME,
189 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
190 .regen_max_retry = REGEN_MAX_RETRY,
191 .max_desync_factor = MAX_DESYNC_FACTOR,
193 .max_addresses = IPV6_MAX_ADDRESSES,
194 .accept_ra_defrtr = 1,
195 .accept_ra_pinfo = 1,
196 #ifdef CONFIG_IPV6_ROUTER_PREF
197 .accept_ra_rtr_pref = 1,
198 .rtr_probe_interval = 60 * HZ,
199 #ifdef CONFIG_IPV6_ROUTE_INFO
200 .accept_ra_rt_info_max_plen = 0,
204 .accept_source_route = 0, /* we do not accept RH0 by default. */
207 .suppress_frag_ndisc = 1,
210 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
212 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
213 .mtu6 = IPV6_MIN_MTU,
215 .accept_redirects = 1,
217 .force_mld_version = 0,
218 .mldv1_unsolicited_report_interval = 10 * HZ,
219 .mldv2_unsolicited_report_interval = HZ,
221 .rtr_solicits = MAX_RTR_SOLICITATIONS,
222 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
223 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
224 #ifdef CONFIG_IPV6_PRIVACY
226 .temp_valid_lft = TEMP_VALID_LIFETIME,
227 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
228 .regen_max_retry = REGEN_MAX_RETRY,
229 .max_desync_factor = MAX_DESYNC_FACTOR,
231 .max_addresses = IPV6_MAX_ADDRESSES,
232 .accept_ra_defrtr = 1,
233 .accept_ra_pinfo = 1,
234 #ifdef CONFIG_IPV6_ROUTER_PREF
235 .accept_ra_rtr_pref = 1,
236 .rtr_probe_interval = 60 * HZ,
237 #ifdef CONFIG_IPV6_ROUTE_INFO
238 .accept_ra_rt_info_max_plen = 0,
242 .accept_source_route = 0, /* we do not accept RH0 by default. */
245 .suppress_frag_ndisc = 1,
248 /* Check if a valid qdisc is available */
249 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
251 return !qdisc_tx_is_noop(dev);
254 static void addrconf_del_rs_timer(struct inet6_dev *idev)
256 if (del_timer(&idev->rs_timer))
260 static void addrconf_del_dad_timer(struct inet6_ifaddr *ifp)
262 if (del_timer(&ifp->dad_timer))
266 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
269 if (!timer_pending(&idev->rs_timer))
271 mod_timer(&idev->rs_timer, jiffies + when);
274 static void addrconf_mod_dad_timer(struct inet6_ifaddr *ifp,
277 if (!timer_pending(&ifp->dad_timer))
279 mod_timer(&ifp->dad_timer, jiffies + when);
282 static int snmp6_alloc_dev(struct inet6_dev *idev)
284 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
285 sizeof(struct ipstats_mib),
286 __alignof__(struct ipstats_mib)) < 0)
288 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
290 if (!idev->stats.icmpv6dev)
292 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
294 if (!idev->stats.icmpv6msgdev)
300 kfree(idev->stats.icmpv6dev);
302 snmp_mib_free((void __percpu **)idev->stats.ipv6);
307 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
309 struct inet6_dev *ndev;
313 if (dev->mtu < IPV6_MIN_MTU)
316 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
321 rwlock_init(&ndev->lock);
323 INIT_LIST_HEAD(&ndev->addr_list);
324 setup_timer(&ndev->rs_timer, addrconf_rs_timer,
325 (unsigned long)ndev);
326 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
327 ndev->cnf.mtu6 = dev->mtu;
328 ndev->cnf.sysctl = NULL;
329 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
330 if (ndev->nd_parms == NULL) {
334 if (ndev->cnf.forwarding)
335 dev_disable_lro(dev);
336 /* We refer to the device */
339 if (snmp6_alloc_dev(ndev) < 0) {
341 "%s: cannot allocate memory for statistics; dev=%s.\n",
342 __func__, dev->name);
343 neigh_parms_release(&nd_tbl, ndev->nd_parms);
349 if (snmp6_register_dev(ndev) < 0) {
351 "%s: cannot create /proc/net/dev_snmp6/%s\n",
352 __func__, dev->name);
353 neigh_parms_release(&nd_tbl, ndev->nd_parms);
355 in6_dev_finish_destroy(ndev);
359 /* One reference from device. We must do this before
360 * we invoke __ipv6_regen_rndid().
364 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
365 ndev->cnf.accept_dad = -1;
367 #if IS_ENABLED(CONFIG_IPV6_SIT)
368 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
369 pr_info("%s: Disabled Multicast RS\n", dev->name);
370 ndev->cnf.rtr_solicits = 0;
374 #ifdef CONFIG_IPV6_PRIVACY
375 INIT_LIST_HEAD(&ndev->tempaddr_list);
376 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
377 if ((dev->flags&IFF_LOOPBACK) ||
378 dev->type == ARPHRD_TUNNEL ||
379 dev->type == ARPHRD_TUNNEL6 ||
380 dev->type == ARPHRD_SIT ||
381 dev->type == ARPHRD_NONE) {
382 ndev->cnf.use_tempaddr = -1;
385 ipv6_regen_rndid((unsigned long) ndev);
388 ndev->token = in6addr_any;
390 if (netif_running(dev) && addrconf_qdisc_ok(dev))
391 ndev->if_flags |= IF_READY;
393 ipv6_mc_init_dev(ndev);
394 ndev->tstamp = jiffies;
395 addrconf_sysctl_register(ndev);
396 /* protected by rtnl_lock */
397 rcu_assign_pointer(dev->ip6_ptr, ndev);
399 /* Join interface-local all-node multicast group */
400 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
402 /* Join all-node multicast group */
403 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
405 /* Join all-router multicast group if forwarding is set */
406 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
407 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
412 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
414 struct inet6_dev *idev;
418 idev = __in6_dev_get(dev);
420 idev = ipv6_add_dev(dev);
425 if (dev->flags&IFF_UP)
430 static int inet6_netconf_msgsize_devconf(int type)
432 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
433 + nla_total_size(4); /* NETCONFA_IFINDEX */
435 /* type -1 is used for ALL */
436 if (type == -1 || type == NETCONFA_FORWARDING)
437 size += nla_total_size(4);
438 #ifdef CONFIG_IPV6_MROUTE
439 if (type == -1 || type == NETCONFA_MC_FORWARDING)
440 size += nla_total_size(4);
446 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
447 struct ipv6_devconf *devconf, u32 portid,
448 u32 seq, int event, unsigned int flags,
451 struct nlmsghdr *nlh;
452 struct netconfmsg *ncm;
454 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
459 ncm = nlmsg_data(nlh);
460 ncm->ncm_family = AF_INET6;
462 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
463 goto nla_put_failure;
465 /* type -1 is used for ALL */
466 if ((type == -1 || type == NETCONFA_FORWARDING) &&
467 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
468 goto nla_put_failure;
469 #ifdef CONFIG_IPV6_MROUTE
470 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
471 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
472 devconf->mc_forwarding) < 0)
473 goto nla_put_failure;
475 return nlmsg_end(skb, nlh);
478 nlmsg_cancel(skb, nlh);
482 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
483 struct ipv6_devconf *devconf)
488 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
492 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
493 RTM_NEWNETCONF, 0, type);
495 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
496 WARN_ON(err == -EMSGSIZE);
500 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
503 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
506 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
507 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
508 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
511 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
512 struct nlmsghdr *nlh)
514 struct net *net = sock_net(in_skb->sk);
515 struct nlattr *tb[NETCONFA_MAX+1];
516 struct netconfmsg *ncm;
518 struct ipv6_devconf *devconf;
519 struct inet6_dev *in6_dev;
520 struct net_device *dev;
524 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
525 devconf_ipv6_policy);
530 if (!tb[NETCONFA_IFINDEX])
533 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
535 case NETCONFA_IFINDEX_ALL:
536 devconf = net->ipv6.devconf_all;
538 case NETCONFA_IFINDEX_DEFAULT:
539 devconf = net->ipv6.devconf_dflt;
542 dev = __dev_get_by_index(net, ifindex);
545 in6_dev = __in6_dev_get(dev);
548 devconf = &in6_dev->cnf;
553 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
557 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
558 NETLINK_CB(in_skb).portid,
559 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
562 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
563 WARN_ON(err == -EMSGSIZE);
567 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
572 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
573 struct netlink_callback *cb)
575 struct net *net = sock_net(skb->sk);
578 struct net_device *dev;
579 struct inet6_dev *idev;
580 struct hlist_head *head;
583 s_idx = idx = cb->args[1];
585 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
587 head = &net->dev_index_head[h];
589 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
591 hlist_for_each_entry_rcu(dev, head, index_hlist) {
594 idev = __in6_dev_get(dev);
598 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
600 NETLINK_CB(cb->skb).portid,
608 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
614 if (h == NETDEV_HASHENTRIES) {
615 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
616 net->ipv6.devconf_all,
617 NETLINK_CB(cb->skb).portid,
619 RTM_NEWNETCONF, NLM_F_MULTI,
625 if (h == NETDEV_HASHENTRIES + 1) {
626 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
627 net->ipv6.devconf_dflt,
628 NETLINK_CB(cb->skb).portid,
630 RTM_NEWNETCONF, NLM_F_MULTI,
644 static void dev_forward_change(struct inet6_dev *idev)
646 struct net_device *dev;
647 struct inet6_ifaddr *ifa;
652 if (idev->cnf.forwarding)
653 dev_disable_lro(dev);
654 if (dev->flags & IFF_MULTICAST) {
655 if (idev->cnf.forwarding) {
656 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
657 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
658 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
660 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
661 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
662 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
666 list_for_each_entry(ifa, &idev->addr_list, if_list) {
667 if (ifa->flags&IFA_F_TENTATIVE)
669 if (idev->cnf.forwarding)
670 addrconf_join_anycast(ifa);
672 addrconf_leave_anycast(ifa);
674 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
675 dev->ifindex, &idev->cnf);
679 static void addrconf_forward_change(struct net *net, __s32 newf)
681 struct net_device *dev;
682 struct inet6_dev *idev;
684 for_each_netdev(net, dev) {
685 idev = __in6_dev_get(dev);
687 int changed = (!idev->cnf.forwarding) ^ (!newf);
688 idev->cnf.forwarding = newf;
690 dev_forward_change(idev);
695 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
701 return restart_syscall();
703 net = (struct net *)table->extra2;
707 if (p == &net->ipv6.devconf_dflt->forwarding) {
708 if ((!newf) ^ (!old))
709 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
710 NETCONFA_IFINDEX_DEFAULT,
711 net->ipv6.devconf_dflt);
716 if (p == &net->ipv6.devconf_all->forwarding) {
717 net->ipv6.devconf_dflt->forwarding = newf;
718 addrconf_forward_change(net, newf);
719 if ((!newf) ^ (!old))
720 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
721 NETCONFA_IFINDEX_ALL,
722 net->ipv6.devconf_all);
723 } else if ((!newf) ^ (!old))
724 dev_forward_change((struct inet6_dev *)table->extra1);
728 rt6_purge_dflt_routers(net);
733 /* Nobody refers to this ifaddr, destroy it */
734 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
736 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
738 #ifdef NET_REFCNT_DEBUG
739 pr_debug("%s\n", __func__);
742 in6_dev_put(ifp->idev);
744 if (del_timer(&ifp->dad_timer))
745 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
747 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
748 pr_warn("Freeing alive inet6 address %p\n", ifp);
757 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
760 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
763 * Each device address list is sorted in order of scope -
764 * global before linklocal.
766 list_for_each(p, &idev->addr_list) {
767 struct inet6_ifaddr *ifa
768 = list_entry(p, struct inet6_ifaddr, if_list);
769 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
773 list_add_tail(&ifp->if_list, p);
776 static u32 inet6_addr_hash(const struct in6_addr *addr)
778 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
781 /* On success it returns ifp with increased reference count */
783 static struct inet6_ifaddr *
784 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
785 const struct in6_addr *peer_addr, int pfxlen,
786 int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
788 struct inet6_ifaddr *ifa = NULL;
792 int addr_type = ipv6_addr_type(addr);
794 if (addr_type == IPV6_ADDR_ANY ||
795 addr_type & IPV6_ADDR_MULTICAST ||
796 (!(idev->dev->flags & IFF_LOOPBACK) &&
797 addr_type & IPV6_ADDR_LOOPBACK))
798 return ERR_PTR(-EADDRNOTAVAIL);
802 err = -ENODEV; /*XXX*/
806 if (idev->cnf.disable_ipv6) {
811 spin_lock(&addrconf_hash_lock);
813 /* Ignore adding duplicate addresses on an interface */
814 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
815 ADBG("ipv6_add_addr: already assigned\n");
820 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
823 ADBG("ipv6_add_addr: malloc failed\n");
828 rt = addrconf_dst_alloc(idev, addr, false);
836 ifa->peer_addr = *peer_addr;
838 spin_lock_init(&ifa->lock);
839 spin_lock_init(&ifa->state_lock);
840 setup_timer(&ifa->dad_timer, addrconf_dad_timer,
842 INIT_HLIST_NODE(&ifa->addr_lst);
844 ifa->prefix_len = pfxlen;
845 ifa->flags = flags | IFA_F_TENTATIVE;
846 ifa->valid_lft = valid_lft;
847 ifa->prefered_lft = prefered_lft;
848 ifa->cstamp = ifa->tstamp = jiffies;
849 ifa->tokenized = false;
858 /* Add to big hash table */
859 hash = inet6_addr_hash(addr);
861 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
862 spin_unlock(&addrconf_hash_lock);
864 write_lock(&idev->lock);
865 /* Add to inet6_dev unicast addr list. */
866 ipv6_link_dev_addr(idev, ifa);
868 #ifdef CONFIG_IPV6_PRIVACY
869 if (ifa->flags&IFA_F_TEMPORARY) {
870 list_add(&ifa->tmp_list, &idev->tempaddr_list);
876 write_unlock(&idev->lock);
878 rcu_read_unlock_bh();
880 if (likely(err == 0))
881 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
889 spin_unlock(&addrconf_hash_lock);
893 /* This function wants to get referenced ifp and releases it before return */
895 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
897 struct inet6_ifaddr *ifa, *ifn;
898 struct inet6_dev *idev = ifp->idev;
900 int deleted = 0, onlink = 0;
901 unsigned long expires = jiffies;
903 spin_lock_bh(&ifp->state_lock);
905 ifp->state = INET6_IFADDR_STATE_DEAD;
906 spin_unlock_bh(&ifp->state_lock);
908 if (state == INET6_IFADDR_STATE_DEAD)
911 spin_lock_bh(&addrconf_hash_lock);
912 hlist_del_init_rcu(&ifp->addr_lst);
913 spin_unlock_bh(&addrconf_hash_lock);
915 write_lock_bh(&idev->lock);
916 #ifdef CONFIG_IPV6_PRIVACY
917 if (ifp->flags&IFA_F_TEMPORARY) {
918 list_del(&ifp->tmp_list);
920 in6_ifa_put(ifp->ifpub);
927 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
929 list_del_init(&ifp->if_list);
932 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
936 } else if (ifp->flags & IFA_F_PERMANENT) {
937 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
939 if (ifa->flags & IFA_F_PERMANENT) {
944 unsigned long lifetime;
949 spin_lock(&ifa->lock);
951 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
953 * Note: Because this address is
954 * not permanent, lifetime <
955 * LONG_MAX / HZ here.
957 if (time_before(expires,
958 ifa->tstamp + lifetime * HZ))
959 expires = ifa->tstamp + lifetime * HZ;
960 spin_unlock(&ifa->lock);
965 write_unlock_bh(&idev->lock);
967 addrconf_del_dad_timer(ifp);
969 ipv6_ifa_notify(RTM_DELADDR, ifp);
971 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
974 * Purge or update corresponding prefix
976 * 1) we don't purge prefix here if address was not permanent.
977 * prefix is managed by its own lifetime.
978 * 2) if there're no addresses, delete prefix.
979 * 3) if there're still other permanent address(es),
980 * corresponding prefix is still permanent.
981 * 4) otherwise, update prefix lifetime to the
982 * longest valid lifetime among the corresponding
983 * addresses on the device.
984 * Note: subsequent RA will update lifetime.
988 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
989 struct in6_addr prefix;
992 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
994 rt = addrconf_get_prefix_route(&prefix,
997 0, RTF_GATEWAY | RTF_DEFAULT);
1003 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
1004 rt6_set_expires(rt, expires);
1010 /* clean up prefsrc entries */
1011 rt6_remove_prefsrc(ifp);
1016 #ifdef CONFIG_IPV6_PRIVACY
1017 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1019 struct inet6_dev *idev = ifp->idev;
1020 struct in6_addr addr, *tmpaddr;
1021 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1022 unsigned long regen_advance;
1026 unsigned long now = jiffies;
1028 write_lock(&idev->lock);
1030 spin_lock_bh(&ift->lock);
1031 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1032 spin_unlock_bh(&ift->lock);
1039 if (idev->cnf.use_tempaddr <= 0) {
1040 write_unlock(&idev->lock);
1041 pr_info("%s: use_tempaddr is disabled\n", __func__);
1046 spin_lock_bh(&ifp->lock);
1047 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1048 idev->cnf.use_tempaddr = -1; /*XXX*/
1049 spin_unlock_bh(&ifp->lock);
1050 write_unlock(&idev->lock);
1051 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1058 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1059 __ipv6_try_regen_rndid(idev, tmpaddr);
1060 memcpy(&addr.s6_addr[8], idev->rndid, 8);
1061 age = (now - ifp->tstamp) / HZ;
1062 tmp_valid_lft = min_t(__u32,
1064 idev->cnf.temp_valid_lft + age);
1065 tmp_prefered_lft = min_t(__u32,
1067 idev->cnf.temp_prefered_lft + age -
1068 idev->cnf.max_desync_factor);
1069 tmp_plen = ifp->prefix_len;
1070 tmp_tstamp = ifp->tstamp;
1071 spin_unlock_bh(&ifp->lock);
1073 regen_advance = idev->cnf.regen_max_retry *
1074 idev->cnf.dad_transmits *
1075 idev->nd_parms->retrans_time / HZ;
1076 write_unlock(&idev->lock);
1078 /* A temporary address is created only if this calculated Preferred
1079 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1080 * an implementation must not create a temporary address with a zero
1081 * Preferred Lifetime.
1083 if (tmp_prefered_lft <= regen_advance) {
1090 addr_flags = IFA_F_TEMPORARY;
1091 /* set in addrconf_prefix_rcv() */
1092 if (ifp->flags & IFA_F_OPTIMISTIC)
1093 addr_flags |= IFA_F_OPTIMISTIC;
1095 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1096 ipv6_addr_scope(&addr), addr_flags,
1097 tmp_valid_lft, tmp_prefered_lft);
1101 pr_info("%s: retry temporary address regeneration\n", __func__);
1103 write_lock(&idev->lock);
1107 spin_lock_bh(&ift->lock);
1110 ift->tstamp = tmp_tstamp;
1111 spin_unlock_bh(&ift->lock);
1113 addrconf_dad_start(ift);
1122 * Choose an appropriate source address (RFC3484)
1125 IPV6_SADDR_RULE_INIT = 0,
1126 IPV6_SADDR_RULE_LOCAL,
1127 IPV6_SADDR_RULE_SCOPE,
1128 IPV6_SADDR_RULE_PREFERRED,
1129 #ifdef CONFIG_IPV6_MIP6
1130 IPV6_SADDR_RULE_HOA,
1132 IPV6_SADDR_RULE_OIF,
1133 IPV6_SADDR_RULE_LABEL,
1134 #ifdef CONFIG_IPV6_PRIVACY
1135 IPV6_SADDR_RULE_PRIVACY,
1137 IPV6_SADDR_RULE_ORCHID,
1138 IPV6_SADDR_RULE_PREFIX,
1142 struct ipv6_saddr_score {
1145 struct inet6_ifaddr *ifa;
1146 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1151 struct ipv6_saddr_dst {
1152 const struct in6_addr *addr;
1159 static inline int ipv6_saddr_preferred(int type)
1161 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1166 static int ipv6_get_saddr_eval(struct net *net,
1167 struct ipv6_saddr_score *score,
1168 struct ipv6_saddr_dst *dst,
1173 if (i <= score->rule) {
1175 case IPV6_SADDR_RULE_SCOPE:
1176 ret = score->scopedist;
1178 case IPV6_SADDR_RULE_PREFIX:
1179 ret = score->matchlen;
1182 ret = !!test_bit(i, score->scorebits);
1188 case IPV6_SADDR_RULE_INIT:
1189 /* Rule 0: remember if hiscore is not ready yet */
1192 case IPV6_SADDR_RULE_LOCAL:
1193 /* Rule 1: Prefer same address */
1194 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1196 case IPV6_SADDR_RULE_SCOPE:
1197 /* Rule 2: Prefer appropriate scope
1202 * ---+--+-+---> scope
1204 * | d is scope of the destination.
1206 * | \ <- smaller scope is better if
1207 * B-15 | \ if scope is enough for destinaion.
1208 * | ret = B - scope (-1 <= scope >= d <= 15).
1210 * |/ <- greater is better
1211 * -C / if scope is not enough for destination.
1212 * /| ret = scope - C (-1 <= d < scope <= 15).
1214 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1215 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1216 * Assume B = 0 and we get C > 29.
1218 ret = __ipv6_addr_src_scope(score->addr_type);
1219 if (ret >= dst->scope)
1222 ret -= 128; /* 30 is enough */
1223 score->scopedist = ret;
1225 case IPV6_SADDR_RULE_PREFERRED:
1226 /* Rule 3: Avoid deprecated and optimistic addresses */
1227 ret = ipv6_saddr_preferred(score->addr_type) ||
1228 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1230 #ifdef CONFIG_IPV6_MIP6
1231 case IPV6_SADDR_RULE_HOA:
1233 /* Rule 4: Prefer home address */
1234 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1235 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1239 case IPV6_SADDR_RULE_OIF:
1240 /* Rule 5: Prefer outgoing interface */
1241 ret = (!dst->ifindex ||
1242 dst->ifindex == score->ifa->idev->dev->ifindex);
1244 case IPV6_SADDR_RULE_LABEL:
1245 /* Rule 6: Prefer matching label */
1246 ret = ipv6_addr_label(net,
1247 &score->ifa->addr, score->addr_type,
1248 score->ifa->idev->dev->ifindex) == dst->label;
1250 #ifdef CONFIG_IPV6_PRIVACY
1251 case IPV6_SADDR_RULE_PRIVACY:
1253 /* Rule 7: Prefer public address
1254 * Note: prefer temporary address if use_tempaddr >= 2
1256 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1257 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1258 score->ifa->idev->cnf.use_tempaddr >= 2;
1259 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1263 case IPV6_SADDR_RULE_ORCHID:
1264 /* Rule 8-: Prefer ORCHID vs ORCHID or
1265 * non-ORCHID vs non-ORCHID
1267 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1268 ipv6_addr_orchid(dst->addr));
1270 case IPV6_SADDR_RULE_PREFIX:
1271 /* Rule 8: Use longest matching prefix */
1272 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1273 if (ret > score->ifa->prefix_len)
1274 ret = score->ifa->prefix_len;
1275 score->matchlen = ret;
1282 __set_bit(i, score->scorebits);
1288 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1289 const struct in6_addr *daddr, unsigned int prefs,
1290 struct in6_addr *saddr)
1292 struct ipv6_saddr_score scores[2],
1293 *score = &scores[0], *hiscore = &scores[1];
1294 struct ipv6_saddr_dst dst;
1295 struct net_device *dev;
1298 dst_type = __ipv6_addr_type(daddr);
1300 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1301 dst.scope = __ipv6_addr_src_scope(dst_type);
1302 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1306 hiscore->ifa = NULL;
1310 for_each_netdev_rcu(net, dev) {
1311 struct inet6_dev *idev;
1313 /* Candidate Source Address (section 4)
1314 * - multicast and link-local destination address,
1315 * the set of candidate source address MUST only
1316 * include addresses assigned to interfaces
1317 * belonging to the same link as the outgoing
1319 * (- For site-local destination addresses, the
1320 * set of candidate source addresses MUST only
1321 * include addresses assigned to interfaces
1322 * belonging to the same site as the outgoing
1325 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1326 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1327 dst.ifindex && dev->ifindex != dst.ifindex)
1330 idev = __in6_dev_get(dev);
1334 read_lock_bh(&idev->lock);
1335 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1339 * - Tentative Address (RFC2462 section 5.4)
1340 * - A tentative address is not considered
1341 * "assigned to an interface" in the traditional
1342 * sense, unless it is also flagged as optimistic.
1343 * - Candidate Source Address (section 4)
1344 * - In any case, anycast addresses, multicast
1345 * addresses, and the unspecified address MUST
1346 * NOT be included in a candidate set.
1348 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1349 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1352 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1354 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1355 score->addr_type & IPV6_ADDR_MULTICAST)) {
1356 LIMIT_NETDEBUG(KERN_DEBUG
1357 "ADDRCONF: unspecified / multicast address "
1358 "assigned as unicast address on %s",
1364 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1366 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1367 int minihiscore, miniscore;
1369 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1370 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1372 if (minihiscore > miniscore) {
1373 if (i == IPV6_SADDR_RULE_SCOPE &&
1374 score->scopedist > 0) {
1377 * each remaining entry
1378 * has too small (not enough)
1379 * scope, because ifa entries
1380 * are sorted by their scope
1386 } else if (minihiscore < miniscore) {
1388 in6_ifa_put(hiscore->ifa);
1390 in6_ifa_hold(score->ifa);
1392 swap(hiscore, score);
1394 /* restore our iterator */
1395 score->ifa = hiscore->ifa;
1402 read_unlock_bh(&idev->lock);
1407 return -EADDRNOTAVAIL;
1409 *saddr = hiscore->ifa->addr;
1410 in6_ifa_put(hiscore->ifa);
1413 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1415 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1416 unsigned char banned_flags)
1418 struct inet6_ifaddr *ifp;
1419 int err = -EADDRNOTAVAIL;
1421 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1422 if (ifp->scope == IFA_LINK &&
1423 !(ifp->flags & banned_flags)) {
1432 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1433 unsigned char banned_flags)
1435 struct inet6_dev *idev;
1436 int err = -EADDRNOTAVAIL;
1439 idev = __in6_dev_get(dev);
1441 read_lock_bh(&idev->lock);
1442 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1443 read_unlock_bh(&idev->lock);
1449 static int ipv6_count_addresses(struct inet6_dev *idev)
1452 struct inet6_ifaddr *ifp;
1454 read_lock_bh(&idev->lock);
1455 list_for_each_entry(ifp, &idev->addr_list, if_list)
1457 read_unlock_bh(&idev->lock);
1461 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1462 const struct net_device *dev, int strict)
1464 struct inet6_ifaddr *ifp;
1465 unsigned int hash = inet6_addr_hash(addr);
1468 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1469 if (!net_eq(dev_net(ifp->idev->dev), net))
1471 if (ipv6_addr_equal(&ifp->addr, addr) &&
1472 !(ifp->flags&IFA_F_TENTATIVE) &&
1473 (dev == NULL || ifp->idev->dev == dev ||
1474 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1475 rcu_read_unlock_bh();
1480 rcu_read_unlock_bh();
1483 EXPORT_SYMBOL(ipv6_chk_addr);
1485 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1486 struct net_device *dev)
1488 unsigned int hash = inet6_addr_hash(addr);
1489 struct inet6_ifaddr *ifp;
1491 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1492 if (!net_eq(dev_net(ifp->idev->dev), net))
1494 if (ipv6_addr_equal(&ifp->addr, addr)) {
1495 if (dev == NULL || ifp->idev->dev == dev)
1502 /* Compares an address/prefix_len with addresses on device @dev.
1503 * If one is found it returns true.
1505 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1506 const unsigned int prefix_len, struct net_device *dev)
1508 struct inet6_dev *idev;
1509 struct inet6_ifaddr *ifa;
1513 idev = __in6_dev_get(dev);
1515 read_lock_bh(&idev->lock);
1516 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1517 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1521 read_unlock_bh(&idev->lock);
1527 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1529 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1531 struct inet6_dev *idev;
1532 struct inet6_ifaddr *ifa;
1537 idev = __in6_dev_get(dev);
1539 read_lock_bh(&idev->lock);
1540 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1541 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1546 read_unlock_bh(&idev->lock);
1551 EXPORT_SYMBOL(ipv6_chk_prefix);
1553 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1554 struct net_device *dev, int strict)
1556 struct inet6_ifaddr *ifp, *result = NULL;
1557 unsigned int hash = inet6_addr_hash(addr);
1560 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1561 if (!net_eq(dev_net(ifp->idev->dev), net))
1563 if (ipv6_addr_equal(&ifp->addr, addr)) {
1564 if (dev == NULL || ifp->idev->dev == dev ||
1565 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1572 rcu_read_unlock_bh();
1577 /* Gets referenced address, destroys ifaddr */
1579 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1581 if (ifp->flags&IFA_F_PERMANENT) {
1582 spin_lock_bh(&ifp->lock);
1583 addrconf_del_dad_timer(ifp);
1584 ifp->flags |= IFA_F_TENTATIVE;
1586 ifp->flags |= IFA_F_DADFAILED;
1587 spin_unlock_bh(&ifp->lock);
1589 ipv6_ifa_notify(0, ifp);
1591 #ifdef CONFIG_IPV6_PRIVACY
1592 } else if (ifp->flags&IFA_F_TEMPORARY) {
1593 struct inet6_ifaddr *ifpub;
1594 spin_lock_bh(&ifp->lock);
1597 in6_ifa_hold(ifpub);
1598 spin_unlock_bh(&ifp->lock);
1599 ipv6_create_tempaddr(ifpub, ifp);
1602 spin_unlock_bh(&ifp->lock);
1610 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1614 spin_lock(&ifp->state_lock);
1615 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1616 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1619 spin_unlock(&ifp->state_lock);
1624 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1626 struct inet6_dev *idev = ifp->idev;
1628 if (addrconf_dad_end(ifp)) {
1633 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1634 ifp->idev->dev->name, &ifp->addr);
1636 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1637 struct in6_addr addr;
1639 addr.s6_addr32[0] = htonl(0xfe800000);
1640 addr.s6_addr32[1] = 0;
1642 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1643 ipv6_addr_equal(&ifp->addr, &addr)) {
1644 /* DAD failed for link-local based on MAC address */
1645 idev->cnf.disable_ipv6 = 1;
1647 pr_info("%s: IPv6 being disabled!\n",
1648 ifp->idev->dev->name);
1652 addrconf_dad_stop(ifp, 1);
1655 /* Join to solicited addr multicast group. */
1657 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1659 struct in6_addr maddr;
1661 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1664 addrconf_addr_solict_mult(addr, &maddr);
1665 ipv6_dev_mc_inc(dev, &maddr);
1668 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1670 struct in6_addr maddr;
1672 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1675 addrconf_addr_solict_mult(addr, &maddr);
1676 __ipv6_dev_mc_dec(idev, &maddr);
1679 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1681 struct in6_addr addr;
1682 if (ifp->prefix_len == 127) /* RFC 6164 */
1684 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1685 if (ipv6_addr_any(&addr))
1687 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1690 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1692 struct in6_addr addr;
1693 if (ifp->prefix_len == 127) /* RFC 6164 */
1695 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1696 if (ipv6_addr_any(&addr))
1698 __ipv6_dev_ac_dec(ifp->idev, &addr);
1701 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1703 if (dev->addr_len != ETH_ALEN)
1705 memcpy(eui, dev->dev_addr, 3);
1706 memcpy(eui + 5, dev->dev_addr + 3, 3);
1709 * The zSeries OSA network cards can be shared among various
1710 * OS instances, but the OSA cards have only one MAC address.
1711 * This leads to duplicate address conflicts in conjunction
1712 * with IPv6 if more than one instance uses the same card.
1714 * The driver for these cards can deliver a unique 16-bit
1715 * identifier for each instance sharing the same card. It is
1716 * placed instead of 0xFFFE in the interface identifier. The
1717 * "u" bit of the interface identifier is not inverted in this
1718 * case. Hence the resulting interface identifier has local
1719 * scope according to RFC2373.
1722 eui[3] = (dev->dev_id >> 8) & 0xFF;
1723 eui[4] = dev->dev_id & 0xFF;
1732 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1734 if (dev->addr_len != IEEE802154_ADDR_LEN)
1736 memcpy(eui, dev->dev_addr, 8);
1741 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1743 union fwnet_hwaddr *ha;
1745 if (dev->addr_len != FWNET_ALEN)
1748 ha = (union fwnet_hwaddr *)dev->dev_addr;
1750 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1755 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1757 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1758 if (dev->addr_len != ARCNET_ALEN)
1761 eui[7] = *(u8 *)dev->dev_addr;
1765 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1767 if (dev->addr_len != INFINIBAND_ALEN)
1769 memcpy(eui, dev->dev_addr + 12, 8);
1774 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1778 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1779 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1780 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1781 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1782 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1783 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1787 memcpy(eui + 4, &addr, 4);
1791 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1793 if (dev->priv_flags & IFF_ISATAP)
1794 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1798 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1800 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1803 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
1805 memcpy(eui, dev->perm_addr, 3);
1806 memcpy(eui + 5, dev->perm_addr + 3, 3);
1813 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1815 switch (dev->type) {
1818 return addrconf_ifid_eui48(eui, dev);
1820 return addrconf_ifid_arcnet(eui, dev);
1821 case ARPHRD_INFINIBAND:
1822 return addrconf_ifid_infiniband(eui, dev);
1824 return addrconf_ifid_sit(eui, dev);
1826 return addrconf_ifid_gre(eui, dev);
1827 case ARPHRD_IEEE802154:
1828 return addrconf_ifid_eui64(eui, dev);
1829 case ARPHRD_IEEE1394:
1830 return addrconf_ifid_ieee1394(eui, dev);
1831 case ARPHRD_TUNNEL6:
1832 return addrconf_ifid_ip6tnl(eui, dev);
1837 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1840 struct inet6_ifaddr *ifp;
1842 read_lock_bh(&idev->lock);
1843 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1844 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1845 memcpy(eui, ifp->addr.s6_addr+8, 8);
1850 read_unlock_bh(&idev->lock);
1854 #ifdef CONFIG_IPV6_PRIVACY
1855 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1856 static void __ipv6_regen_rndid(struct inet6_dev *idev)
1859 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1860 idev->rndid[0] &= ~0x02;
1863 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1864 * check if generated address is not inappropriate
1866 * - Reserved subnet anycast (RFC 2526)
1867 * 11111101 11....11 1xxxxxxx
1868 * - ISATAP (RFC4214) 6.1
1869 * 00-00-5E-FE-xx-xx-xx-xx
1871 * - XXX: already assigned to an address on the device
1873 if (idev->rndid[0] == 0xfd &&
1874 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1875 (idev->rndid[7]&0x80))
1877 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1878 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1880 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1885 static void ipv6_regen_rndid(unsigned long data)
1887 struct inet6_dev *idev = (struct inet6_dev *) data;
1888 unsigned long expires;
1891 write_lock_bh(&idev->lock);
1896 __ipv6_regen_rndid(idev);
1899 idev->cnf.temp_prefered_lft * HZ -
1900 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1901 idev->cnf.max_desync_factor * HZ;
1902 if (time_before(expires, jiffies)) {
1903 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
1904 __func__, idev->dev->name);
1908 if (!mod_timer(&idev->regen_timer, expires))
1912 write_unlock_bh(&idev->lock);
1913 rcu_read_unlock_bh();
1917 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
1919 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1920 __ipv6_regen_rndid(idev);
1929 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1930 unsigned long expires, u32 flags)
1932 struct fib6_config cfg = {
1933 .fc_table = RT6_TABLE_PREFIX,
1934 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1935 .fc_ifindex = dev->ifindex,
1936 .fc_expires = expires,
1938 .fc_flags = RTF_UP | flags,
1939 .fc_nlinfo.nl_net = dev_net(dev),
1940 .fc_protocol = RTPROT_KERNEL,
1945 /* Prevent useless cloning on PtP SIT.
1946 This thing is done here expecting that the whole
1947 class of non-broadcast devices need not cloning.
1949 #if IS_ENABLED(CONFIG_IPV6_SIT)
1950 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1951 cfg.fc_flags |= RTF_NONEXTHOP;
1954 ip6_route_add(&cfg);
1958 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
1960 const struct net_device *dev,
1961 u32 flags, u32 noflags)
1963 struct fib6_node *fn;
1964 struct rt6_info *rt = NULL;
1965 struct fib6_table *table;
1967 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
1971 read_lock_bh(&table->tb6_lock);
1972 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
1975 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1976 if (rt->dst.dev->ifindex != dev->ifindex)
1978 if ((rt->rt6i_flags & flags) != flags)
1980 if ((rt->rt6i_flags & noflags) != 0)
1986 read_unlock_bh(&table->tb6_lock);
1991 /* Create "default" multicast route to the interface */
1993 static void addrconf_add_mroute(struct net_device *dev)
1995 struct fib6_config cfg = {
1996 .fc_table = RT6_TABLE_LOCAL,
1997 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1998 .fc_ifindex = dev->ifindex,
2001 .fc_nlinfo.nl_net = dev_net(dev),
2004 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2006 ip6_route_add(&cfg);
2009 #if IS_ENABLED(CONFIG_IPV6_SIT)
2010 static void sit_route_add(struct net_device *dev)
2012 struct fib6_config cfg = {
2013 .fc_table = RT6_TABLE_MAIN,
2014 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2015 .fc_ifindex = dev->ifindex,
2017 .fc_flags = RTF_UP | RTF_NONEXTHOP,
2018 .fc_nlinfo.nl_net = dev_net(dev),
2021 /* prefix length - 96 bits "::d.d.d.d" */
2022 ip6_route_add(&cfg);
2026 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2028 struct inet6_dev *idev;
2032 idev = ipv6_find_idev(dev);
2034 return ERR_PTR(-ENOBUFS);
2036 if (idev->cnf.disable_ipv6)
2037 return ERR_PTR(-EACCES);
2039 /* Add default multicast route */
2040 if (!(dev->flags & IFF_LOOPBACK))
2041 addrconf_add_mroute(dev);
2046 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2048 struct prefix_info *pinfo;
2052 struct inet6_dev *in6_dev;
2053 struct net *net = dev_net(dev);
2055 pinfo = (struct prefix_info *) opt;
2057 if (len < sizeof(struct prefix_info)) {
2058 ADBG("addrconf: prefix option too short\n");
2063 * Validation checks ([ADDRCONF], page 19)
2066 addr_type = ipv6_addr_type(&pinfo->prefix);
2068 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2071 valid_lft = ntohl(pinfo->valid);
2072 prefered_lft = ntohl(pinfo->prefered);
2074 if (prefered_lft > valid_lft) {
2075 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2079 in6_dev = in6_dev_get(dev);
2081 if (in6_dev == NULL) {
2082 net_dbg_ratelimited("addrconf: device %s not configured\n",
2088 * Two things going on here:
2089 * 1) Add routes for on-link prefixes
2090 * 2) Configure prefixes with the auto flag set
2093 if (pinfo->onlink) {
2094 struct rt6_info *rt;
2095 unsigned long rt_expires;
2097 /* Avoid arithmetic overflow. Really, we could
2098 * save rt_expires in seconds, likely valid_lft,
2099 * but it would require division in fib gc, that it
2103 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2105 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2107 if (addrconf_finite_timeout(rt_expires))
2110 rt = addrconf_get_prefix_route(&pinfo->prefix,
2113 RTF_ADDRCONF | RTF_PREFIX_RT,
2114 RTF_GATEWAY | RTF_DEFAULT);
2117 /* Autoconf prefix route */
2118 if (valid_lft == 0) {
2121 } else if (addrconf_finite_timeout(rt_expires)) {
2123 rt6_set_expires(rt, jiffies + rt_expires);
2125 rt6_clean_expires(rt);
2127 } else if (valid_lft) {
2128 clock_t expires = 0;
2129 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2130 if (addrconf_finite_timeout(rt_expires)) {
2132 flags |= RTF_EXPIRES;
2133 expires = jiffies_to_clock_t(rt_expires);
2135 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2136 dev, expires, flags);
2141 /* Try to figure out our local address for this prefix */
2143 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2144 struct inet6_ifaddr *ifp;
2145 struct in6_addr addr;
2146 int create = 0, update_lft = 0;
2147 bool tokenized = false;
2149 if (pinfo->prefix_len == 64) {
2150 memcpy(&addr, &pinfo->prefix, 8);
2152 if (!ipv6_addr_any(&in6_dev->token)) {
2153 read_lock_bh(&in6_dev->lock);
2154 memcpy(addr.s6_addr + 8,
2155 in6_dev->token.s6_addr + 8, 8);
2156 read_unlock_bh(&in6_dev->lock);
2158 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2159 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2160 in6_dev_put(in6_dev);
2165 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2167 in6_dev_put(in6_dev);
2172 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
2174 if (ifp == NULL && valid_lft) {
2175 int max_addresses = in6_dev->cnf.max_addresses;
2178 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2179 if (in6_dev->cnf.optimistic_dad &&
2180 !net->ipv6.devconf_all->forwarding && sllao)
2181 addr_flags = IFA_F_OPTIMISTIC;
2184 /* Do not allow to create too much of autoconfigured
2185 * addresses; this would be too easy way to crash kernel.
2187 if (!max_addresses ||
2188 ipv6_count_addresses(in6_dev) < max_addresses)
2189 ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2191 addr_type&IPV6_ADDR_SCOPE_MASK,
2192 addr_flags, valid_lft,
2195 if (IS_ERR_OR_NULL(ifp)) {
2196 in6_dev_put(in6_dev);
2202 ifp->cstamp = jiffies;
2203 ifp->tokenized = tokenized;
2204 addrconf_dad_start(ifp);
2210 #ifdef CONFIG_IPV6_PRIVACY
2211 struct inet6_ifaddr *ift;
2215 /* update lifetime (RFC2462 5.5.3 e) */
2216 spin_lock(&ifp->lock);
2218 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2219 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2222 if (!update_lft && !create && stored_lft) {
2223 if (valid_lft > MIN_VALID_LIFETIME ||
2224 valid_lft > stored_lft)
2226 else if (stored_lft <= MIN_VALID_LIFETIME) {
2227 /* valid_lft <= stored_lft is always true */
2229 * RFC 4862 Section 5.5.3e:
2230 * "Note that the preferred lifetime of
2231 * the corresponding address is always
2232 * reset to the Preferred Lifetime in
2233 * the received Prefix Information
2234 * option, regardless of whether the
2235 * valid lifetime is also reset or
2238 * So if the preferred lifetime in
2239 * this advertisement is different
2240 * than what we have stored, but the
2241 * valid lifetime is invalid, just
2242 * reset prefered_lft.
2244 * We must set the valid lifetime
2245 * to the stored lifetime since we'll
2246 * be updating the timestamp below,
2247 * else we'll set it back to the
2250 if (prefered_lft != ifp->prefered_lft) {
2251 valid_lft = stored_lft;
2255 valid_lft = MIN_VALID_LIFETIME;
2256 if (valid_lft < prefered_lft)
2257 prefered_lft = valid_lft;
2263 ifp->valid_lft = valid_lft;
2264 ifp->prefered_lft = prefered_lft;
2267 ifp->flags &= ~IFA_F_DEPRECATED;
2268 spin_unlock(&ifp->lock);
2270 if (!(flags&IFA_F_TENTATIVE))
2271 ipv6_ifa_notify(0, ifp);
2273 spin_unlock(&ifp->lock);
2275 #ifdef CONFIG_IPV6_PRIVACY
2276 read_lock_bh(&in6_dev->lock);
2277 /* update all temporary addresses in the list */
2278 list_for_each_entry(ift, &in6_dev->tempaddr_list,
2280 int age, max_valid, max_prefered;
2282 if (ifp != ift->ifpub)
2286 * RFC 4941 section 3.3:
2287 * If a received option will extend the lifetime
2288 * of a public address, the lifetimes of
2289 * temporary addresses should be extended,
2290 * subject to the overall constraint that no
2291 * temporary addresses should ever remain
2292 * "valid" or "preferred" for a time longer than
2293 * (TEMP_VALID_LIFETIME) or
2294 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR),
2297 age = (now - ift->cstamp) / HZ;
2298 max_valid = in6_dev->cnf.temp_valid_lft - age;
2302 max_prefered = in6_dev->cnf.temp_prefered_lft -
2303 in6_dev->cnf.max_desync_factor -
2305 if (max_prefered < 0)
2308 if (valid_lft > max_valid)
2309 valid_lft = max_valid;
2311 if (prefered_lft > max_prefered)
2312 prefered_lft = max_prefered;
2314 spin_lock(&ift->lock);
2316 ift->valid_lft = valid_lft;
2317 ift->prefered_lft = prefered_lft;
2319 if (prefered_lft > 0)
2320 ift->flags &= ~IFA_F_DEPRECATED;
2322 spin_unlock(&ift->lock);
2323 if (!(flags&IFA_F_TENTATIVE))
2324 ipv6_ifa_notify(0, ift);
2327 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
2329 * When a new public address is created as
2330 * described in [ADDRCONF], also create a new
2331 * temporary address. Also create a temporary
2332 * address if it's enabled but no temporary
2333 * address currently exists.
2335 read_unlock_bh(&in6_dev->lock);
2336 ipv6_create_tempaddr(ifp, NULL);
2338 read_unlock_bh(&in6_dev->lock);
2345 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2346 in6_dev_put(in6_dev);
2350 * Set destination address.
2351 * Special case for SIT interfaces where we create a new "virtual"
2354 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2356 struct in6_ifreq ireq;
2357 struct net_device *dev;
2363 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2366 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2372 #if IS_ENABLED(CONFIG_IPV6_SIT)
2373 if (dev->type == ARPHRD_SIT) {
2374 const struct net_device_ops *ops = dev->netdev_ops;
2376 struct ip_tunnel_parm p;
2378 err = -EADDRNOTAVAIL;
2379 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2382 memset(&p, 0, sizeof(p));
2383 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2387 p.iph.protocol = IPPROTO_IPV6;
2389 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2391 if (ops->ndo_do_ioctl) {
2392 mm_segment_t oldfs = get_fs();
2395 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2402 dev = __dev_get_by_name(net, p.name);
2405 err = dev_open(dev);
2416 * Manual configuration of address on an interface
2418 static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx,
2419 const struct in6_addr *peer_pfx,
2420 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2423 struct inet6_ifaddr *ifp;
2424 struct inet6_dev *idev;
2425 struct net_device *dev;
2429 unsigned long timeout;
2436 /* check the lifetime */
2437 if (!valid_lft || prefered_lft > valid_lft)
2440 dev = __dev_get_by_index(net, ifindex);
2444 idev = addrconf_add_dev(dev);
2446 return PTR_ERR(idev);
2448 scope = ipv6_addr_scope(pfx);
2450 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2451 if (addrconf_finite_timeout(timeout)) {
2452 expires = jiffies_to_clock_t(timeout * HZ);
2453 valid_lft = timeout;
2454 flags = RTF_EXPIRES;
2458 ifa_flags |= IFA_F_PERMANENT;
2461 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2462 if (addrconf_finite_timeout(timeout)) {
2464 ifa_flags |= IFA_F_DEPRECATED;
2465 prefered_lft = timeout;
2468 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2469 valid_lft, prefered_lft);
2472 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2475 * Note that section 3.1 of RFC 4429 indicates
2476 * that the Optimistic flag should not be set for
2477 * manually configured addresses
2479 addrconf_dad_start(ifp);
2485 return PTR_ERR(ifp);
2488 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
2491 struct inet6_ifaddr *ifp;
2492 struct inet6_dev *idev;
2493 struct net_device *dev;
2498 dev = __dev_get_by_index(net, ifindex);
2502 if ((idev = __in6_dev_get(dev)) == NULL)
2505 read_lock_bh(&idev->lock);
2506 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2507 if (ifp->prefix_len == plen &&
2508 ipv6_addr_equal(pfx, &ifp->addr)) {
2510 read_unlock_bh(&idev->lock);
2516 read_unlock_bh(&idev->lock);
2517 return -EADDRNOTAVAIL;
2521 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2523 struct in6_ifreq ireq;
2526 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2529 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2533 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2534 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2535 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2540 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2542 struct in6_ifreq ireq;
2545 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2548 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2552 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2553 ireq.ifr6_prefixlen);
2558 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2559 int plen, int scope)
2561 struct inet6_ifaddr *ifp;
2563 ifp = ipv6_add_addr(idev, addr, NULL, plen,
2564 scope, IFA_F_PERMANENT, 0, 0);
2566 spin_lock_bh(&ifp->lock);
2567 ifp->flags &= ~IFA_F_TENTATIVE;
2568 spin_unlock_bh(&ifp->lock);
2569 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2574 #if IS_ENABLED(CONFIG_IPV6_SIT)
2575 static void sit_add_v4_addrs(struct inet6_dev *idev)
2577 struct in6_addr addr;
2578 struct net_device *dev;
2579 struct net *net = dev_net(idev->dev);
2584 memset(&addr, 0, sizeof(struct in6_addr));
2585 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2587 if (idev->dev->flags&IFF_POINTOPOINT) {
2588 addr.s6_addr32[0] = htonl(0xfe800000);
2591 scope = IPV6_ADDR_COMPATv4;
2594 if (addr.s6_addr32[3]) {
2595 add_addr(idev, &addr, 128, scope);
2599 for_each_netdev(net, dev) {
2600 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2601 if (in_dev && (dev->flags & IFF_UP)) {
2602 struct in_ifaddr *ifa;
2606 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2609 addr.s6_addr32[3] = ifa->ifa_local;
2611 if (ifa->ifa_scope == RT_SCOPE_LINK)
2613 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2614 if (idev->dev->flags&IFF_POINTOPOINT)
2618 if (idev->dev->flags&IFF_POINTOPOINT)
2623 add_addr(idev, &addr, plen, flag);
2630 static void init_loopback(struct net_device *dev)
2632 struct inet6_dev *idev;
2633 struct net_device *sp_dev;
2634 struct inet6_ifaddr *sp_ifa;
2635 struct rt6_info *sp_rt;
2641 if ((idev = ipv6_find_idev(dev)) == NULL) {
2642 pr_debug("%s: add_dev failed\n", __func__);
2646 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2648 /* Add routes to other interface's IPv6 addresses */
2649 for_each_netdev(dev_net(dev), sp_dev) {
2650 if (!strcmp(sp_dev->name, dev->name))
2653 idev = __in6_dev_get(sp_dev);
2657 read_lock_bh(&idev->lock);
2658 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2660 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2666 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, 0);
2668 /* Failure cases are ignored */
2669 if (!IS_ERR(sp_rt)) {
2674 read_unlock_bh(&idev->lock);
2678 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
2680 struct inet6_ifaddr *ifp;
2681 u32 addr_flags = IFA_F_PERMANENT;
2683 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2684 if (idev->cnf.optimistic_dad &&
2685 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2686 addr_flags |= IFA_F_OPTIMISTIC;
2690 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags, 0, 0);
2692 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2693 addrconf_dad_start(ifp);
2698 static void addrconf_dev_config(struct net_device *dev)
2700 struct in6_addr addr;
2701 struct inet6_dev *idev;
2705 if ((dev->type != ARPHRD_ETHER) &&
2706 (dev->type != ARPHRD_FDDI) &&
2707 (dev->type != ARPHRD_ARCNET) &&
2708 (dev->type != ARPHRD_INFINIBAND) &&
2709 (dev->type != ARPHRD_IEEE802154) &&
2710 (dev->type != ARPHRD_IEEE1394) &&
2711 (dev->type != ARPHRD_TUNNEL6)) {
2712 /* Alas, we support only Ethernet autoconfiguration. */
2716 idev = addrconf_add_dev(dev);
2720 memset(&addr, 0, sizeof(struct in6_addr));
2721 addr.s6_addr32[0] = htonl(0xFE800000);
2723 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2724 addrconf_add_linklocal(idev, &addr);
2727 #if IS_ENABLED(CONFIG_IPV6_SIT)
2728 static void addrconf_sit_config(struct net_device *dev)
2730 struct inet6_dev *idev;
2735 * Configure the tunnel with one of our IPv4
2736 * addresses... we should configure all of
2737 * our v4 addrs in the tunnel
2740 if ((idev = ipv6_find_idev(dev)) == NULL) {
2741 pr_debug("%s: add_dev failed\n", __func__);
2745 if (dev->priv_flags & IFF_ISATAP) {
2746 struct in6_addr addr;
2748 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2749 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2750 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2751 addrconf_add_linklocal(idev, &addr);
2755 sit_add_v4_addrs(idev);
2757 if (dev->flags&IFF_POINTOPOINT)
2758 addrconf_add_mroute(dev);
2764 #if IS_ENABLED(CONFIG_NET_IPGRE)
2765 static void addrconf_gre_config(struct net_device *dev)
2767 struct inet6_dev *idev;
2768 struct in6_addr addr;
2772 if ((idev = ipv6_find_idev(dev)) == NULL) {
2773 pr_debug("%s: add_dev failed\n", __func__);
2777 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2778 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2780 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2781 addrconf_add_linklocal(idev, &addr);
2786 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2788 struct in6_addr lladdr;
2790 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2791 addrconf_add_linklocal(idev, &lladdr);
2797 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2800 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2801 struct inet6_dev *idev = __in6_dev_get(dev);
2802 int run_pending = 0;
2806 case NETDEV_REGISTER:
2807 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2808 idev = ipv6_add_dev(dev);
2810 return notifier_from_errno(-ENOMEM);
2816 if (dev->flags & IFF_SLAVE)
2819 if (event == NETDEV_UP) {
2820 if (!addrconf_qdisc_ok(dev)) {
2821 /* device is not ready yet. */
2822 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
2827 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2828 idev = ipv6_add_dev(dev);
2831 idev->if_flags |= IF_READY;
2835 if (!addrconf_qdisc_ok(dev)) {
2836 /* device is still not ready. */
2841 if (idev->if_flags & IF_READY)
2842 /* device is already configured. */
2844 idev->if_flags |= IF_READY;
2847 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
2853 switch (dev->type) {
2854 #if IS_ENABLED(CONFIG_IPV6_SIT)
2856 addrconf_sit_config(dev);
2859 #if IS_ENABLED(CONFIG_NET_IPGRE)
2861 addrconf_gre_config(dev);
2864 case ARPHRD_LOOPBACK:
2869 addrconf_dev_config(dev);
2875 addrconf_dad_run(idev);
2878 * If the MTU changed during the interface down,
2879 * when the interface up, the changed MTU must be
2880 * reflected in the idev as well as routers.
2882 if (idev->cnf.mtu6 != dev->mtu &&
2883 dev->mtu >= IPV6_MIN_MTU) {
2884 rt6_mtu_change(dev, dev->mtu);
2885 idev->cnf.mtu6 = dev->mtu;
2887 idev->tstamp = jiffies;
2888 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2891 * If the changed mtu during down is lower than
2892 * IPV6_MIN_MTU stop IPv6 on this interface.
2894 if (dev->mtu < IPV6_MIN_MTU)
2895 addrconf_ifdown(dev, 1);
2899 case NETDEV_CHANGEMTU:
2900 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2901 rt6_mtu_change(dev, dev->mtu);
2902 idev->cnf.mtu6 = dev->mtu;
2906 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2907 idev = ipv6_add_dev(dev);
2913 * MTU falled under IPV6_MIN_MTU.
2914 * Stop IPv6 on this interface.
2918 case NETDEV_UNREGISTER:
2920 * Remove all addresses from this interface.
2922 addrconf_ifdown(dev, event != NETDEV_DOWN);
2925 case NETDEV_CHANGENAME:
2927 snmp6_unregister_dev(idev);
2928 addrconf_sysctl_unregister(idev);
2929 addrconf_sysctl_register(idev);
2930 err = snmp6_register_dev(idev);
2932 return notifier_from_errno(err);
2936 case NETDEV_PRE_TYPE_CHANGE:
2937 case NETDEV_POST_TYPE_CHANGE:
2938 addrconf_type_change(dev, event);
2946 * addrconf module should be notified of a device going up
2948 static struct notifier_block ipv6_dev_notf = {
2949 .notifier_call = addrconf_notify,
2952 static void addrconf_type_change(struct net_device *dev, unsigned long event)
2954 struct inet6_dev *idev;
2957 idev = __in6_dev_get(dev);
2959 if (event == NETDEV_POST_TYPE_CHANGE)
2960 ipv6_mc_remap(idev);
2961 else if (event == NETDEV_PRE_TYPE_CHANGE)
2962 ipv6_mc_unmap(idev);
2965 static int addrconf_ifdown(struct net_device *dev, int how)
2967 struct net *net = dev_net(dev);
2968 struct inet6_dev *idev;
2969 struct inet6_ifaddr *ifa;
2974 rt6_ifdown(net, dev);
2975 neigh_ifdown(&nd_tbl, dev);
2977 idev = __in6_dev_get(dev);
2982 * Step 1: remove reference to ipv6 device from parent device.
2988 /* protected by rtnl_lock */
2989 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
2991 /* Step 1.5: remove snmp6 entry */
2992 snmp6_unregister_dev(idev);
2996 /* Step 2: clear hash table */
2997 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
2998 struct hlist_head *h = &inet6_addr_lst[i];
3000 spin_lock_bh(&addrconf_hash_lock);
3002 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3003 if (ifa->idev == idev) {
3004 hlist_del_init_rcu(&ifa->addr_lst);
3005 addrconf_del_dad_timer(ifa);
3009 spin_unlock_bh(&addrconf_hash_lock);
3012 write_lock_bh(&idev->lock);
3014 addrconf_del_rs_timer(idev);
3016 /* Step 2: clear flags for stateless addrconf */
3018 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3020 #ifdef CONFIG_IPV6_PRIVACY
3021 if (how && del_timer(&idev->regen_timer))
3024 /* Step 3: clear tempaddr list */
3025 while (!list_empty(&idev->tempaddr_list)) {
3026 ifa = list_first_entry(&idev->tempaddr_list,
3027 struct inet6_ifaddr, tmp_list);
3028 list_del(&ifa->tmp_list);
3029 write_unlock_bh(&idev->lock);
3030 spin_lock_bh(&ifa->lock);
3033 in6_ifa_put(ifa->ifpub);
3036 spin_unlock_bh(&ifa->lock);
3038 write_lock_bh(&idev->lock);
3042 while (!list_empty(&idev->addr_list)) {
3043 ifa = list_first_entry(&idev->addr_list,
3044 struct inet6_ifaddr, if_list);
3045 addrconf_del_dad_timer(ifa);
3047 list_del(&ifa->if_list);
3049 write_unlock_bh(&idev->lock);
3051 spin_lock_bh(&ifa->state_lock);
3053 ifa->state = INET6_IFADDR_STATE_DEAD;
3054 spin_unlock_bh(&ifa->state_lock);
3056 if (state != INET6_IFADDR_STATE_DEAD) {
3057 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3058 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3062 write_lock_bh(&idev->lock);
3065 write_unlock_bh(&idev->lock);
3067 /* Step 5: Discard multicast list */
3069 ipv6_mc_destroy_dev(idev);
3073 idev->tstamp = jiffies;
3075 /* Last: Shot the device (if unregistered) */
3077 addrconf_sysctl_unregister(idev);
3078 neigh_parms_release(&nd_tbl, idev->nd_parms);
3079 neigh_ifdown(&nd_tbl, dev);
3085 static void addrconf_rs_timer(unsigned long data)
3087 struct inet6_dev *idev = (struct inet6_dev *)data;
3088 struct net_device *dev = idev->dev;
3089 struct in6_addr lladdr;
3091 write_lock(&idev->lock);
3092 if (idev->dead || !(idev->if_flags & IF_READY))
3095 if (!ipv6_accept_ra(idev))
3098 /* Announcement received after solicitation was sent */
3099 if (idev->if_flags & IF_RA_RCVD)
3102 if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
3103 write_unlock(&idev->lock);
3104 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3105 ndisc_send_rs(dev, &lladdr,
3106 &in6addr_linklocal_allrouters);
3110 write_lock(&idev->lock);
3111 /* The wait after the last probe can be shorter */
3112 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3113 idev->cnf.rtr_solicits) ?
3114 idev->cnf.rtr_solicit_delay :
3115 idev->cnf.rtr_solicit_interval);
3118 * Note: we do not support deprecated "all on-link"
3119 * assumption any longer.
3121 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3125 write_unlock(&idev->lock);
3131 * Duplicate Address Detection
3133 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3135 unsigned long rand_num;
3136 struct inet6_dev *idev = ifp->idev;
3138 if (ifp->flags & IFA_F_OPTIMISTIC)
3141 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
3143 ifp->dad_probes = idev->cnf.dad_transmits;
3144 addrconf_mod_dad_timer(ifp, rand_num);
3147 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3149 struct inet6_dev *idev = ifp->idev;
3150 struct net_device *dev = idev->dev;
3152 addrconf_join_solict(dev, &ifp->addr);
3154 net_srandom(ifp->addr.s6_addr32[3]);
3156 read_lock_bh(&idev->lock);
3157 spin_lock(&ifp->lock);
3158 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3161 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3162 idev->cnf.accept_dad < 1 ||
3163 !(ifp->flags&IFA_F_TENTATIVE) ||
3164 ifp->flags & IFA_F_NODAD) {
3165 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3166 spin_unlock(&ifp->lock);
3167 read_unlock_bh(&idev->lock);
3169 addrconf_dad_completed(ifp);
3173 if (!(idev->if_flags & IF_READY)) {
3174 spin_unlock(&ifp->lock);
3175 read_unlock_bh(&idev->lock);
3177 * If the device is not ready:
3178 * - keep it tentative if it is a permanent address.
3179 * - otherwise, kill it.
3182 addrconf_dad_stop(ifp, 0);
3187 * Optimistic nodes can start receiving
3190 if (ifp->flags & IFA_F_OPTIMISTIC)
3191 ip6_ins_rt(ifp->rt);
3193 addrconf_dad_kick(ifp);
3195 spin_unlock(&ifp->lock);
3196 read_unlock_bh(&idev->lock);
3199 static void addrconf_dad_timer(unsigned long data)
3201 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
3202 struct inet6_dev *idev = ifp->idev;
3203 struct in6_addr mcaddr;
3205 if (!ifp->dad_probes && addrconf_dad_end(ifp))
3208 write_lock(&idev->lock);
3209 if (idev->dead || !(idev->if_flags & IF_READY)) {
3210 write_unlock(&idev->lock);
3214 spin_lock(&ifp->lock);
3215 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3216 spin_unlock(&ifp->lock);
3217 write_unlock(&idev->lock);
3221 if (ifp->dad_probes == 0) {
3223 * DAD was successful
3226 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3227 spin_unlock(&ifp->lock);
3228 write_unlock(&idev->lock);
3230 addrconf_dad_completed(ifp);
3236 addrconf_mod_dad_timer(ifp, ifp->idev->nd_parms->retrans_time);
3237 spin_unlock(&ifp->lock);
3238 write_unlock(&idev->lock);
3240 /* send a neighbour solicitation for our addr */
3241 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3242 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
3247 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3249 struct net_device *dev = ifp->idev->dev;
3250 struct in6_addr lladdr;
3251 bool send_rs, send_mld;
3253 addrconf_del_dad_timer(ifp);
3256 * Configure the address for reception. Now it is valid.
3259 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3261 /* If added prefix is link local and we are prepared to process
3262 router advertisements, start sending router solicitations.
3265 read_lock_bh(&ifp->idev->lock);
3266 spin_lock(&ifp->lock);
3267 send_mld = ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL &&
3268 ifp->idev->valid_ll_addr_cnt == 1;
3269 send_rs = send_mld &&
3270 ipv6_accept_ra(ifp->idev) &&
3271 ifp->idev->cnf.rtr_solicits > 0 &&
3272 (dev->flags&IFF_LOOPBACK) == 0;
3273 spin_unlock(&ifp->lock);
3274 read_unlock_bh(&ifp->idev->lock);
3276 /* While dad is in progress mld report's source address is in6_addrany.
3277 * Resend with proper ll now.
3280 ipv6_mc_dad_complete(ifp->idev);
3284 * If a host as already performed a random delay
3285 * [...] as part of DAD [...] there is no need
3286 * to delay again before sending the first RS
3288 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3290 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
3292 write_lock_bh(&ifp->idev->lock);
3293 spin_lock(&ifp->lock);
3294 ifp->idev->rs_probes = 1;
3295 ifp->idev->if_flags |= IF_RS_SENT;
3296 addrconf_mod_rs_timer(ifp->idev,
3297 ifp->idev->cnf.rtr_solicit_interval);
3298 spin_unlock(&ifp->lock);
3299 write_unlock_bh(&ifp->idev->lock);
3303 static void addrconf_dad_run(struct inet6_dev *idev)
3305 struct inet6_ifaddr *ifp;
3307 read_lock_bh(&idev->lock);
3308 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3309 spin_lock(&ifp->lock);
3310 if (ifp->flags & IFA_F_TENTATIVE &&
3311 ifp->state == INET6_IFADDR_STATE_DAD)
3312 addrconf_dad_kick(ifp);
3313 spin_unlock(&ifp->lock);
3315 read_unlock_bh(&idev->lock);
3318 #ifdef CONFIG_PROC_FS
3319 struct if6_iter_state {
3320 struct seq_net_private p;
3325 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3327 struct inet6_ifaddr *ifa = NULL;
3328 struct if6_iter_state *state = seq->private;
3329 struct net *net = seq_file_net(seq);
3332 /* initial bucket if pos is 0 */
3338 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3339 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
3341 if (!net_eq(dev_net(ifa->idev->dev), net))
3343 /* sync with offset */
3344 if (p < state->offset) {
3352 /* prepare for next bucket */
3359 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3360 struct inet6_ifaddr *ifa)
3362 struct if6_iter_state *state = seq->private;
3363 struct net *net = seq_file_net(seq);
3365 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
3366 if (!net_eq(dev_net(ifa->idev->dev), net))
3372 while (++state->bucket < IN6_ADDR_HSIZE) {
3374 hlist_for_each_entry_rcu_bh(ifa,
3375 &inet6_addr_lst[state->bucket], addr_lst) {
3376 if (!net_eq(dev_net(ifa->idev->dev), net))
3386 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3390 return if6_get_first(seq, *pos);
3393 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3395 struct inet6_ifaddr *ifa;
3397 ifa = if6_get_next(seq, v);
3402 static void if6_seq_stop(struct seq_file *seq, void *v)
3405 rcu_read_unlock_bh();
3408 static int if6_seq_show(struct seq_file *seq, void *v)
3410 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3411 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3413 ifp->idev->dev->ifindex,
3417 ifp->idev->dev->name);
3421 static const struct seq_operations if6_seq_ops = {
3422 .start = if6_seq_start,
3423 .next = if6_seq_next,
3424 .show = if6_seq_show,
3425 .stop = if6_seq_stop,
3428 static int if6_seq_open(struct inode *inode, struct file *file)
3430 return seq_open_net(inode, file, &if6_seq_ops,
3431 sizeof(struct if6_iter_state));
3434 static const struct file_operations if6_fops = {
3435 .owner = THIS_MODULE,
3436 .open = if6_seq_open,
3438 .llseek = seq_lseek,
3439 .release = seq_release_net,
3442 static int __net_init if6_proc_net_init(struct net *net)
3444 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
3449 static void __net_exit if6_proc_net_exit(struct net *net)
3451 remove_proc_entry("if_inet6", net->proc_net);
3454 static struct pernet_operations if6_proc_net_ops = {
3455 .init = if6_proc_net_init,
3456 .exit = if6_proc_net_exit,
3459 int __init if6_proc_init(void)
3461 return register_pernet_subsys(&if6_proc_net_ops);
3464 void if6_proc_exit(void)
3466 unregister_pernet_subsys(&if6_proc_net_ops);
3468 #endif /* CONFIG_PROC_FS */
3470 #if IS_ENABLED(CONFIG_IPV6_MIP6)
3471 /* Check if address is a home address configured on any interface. */
3472 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3475 struct inet6_ifaddr *ifp = NULL;
3476 unsigned int hash = inet6_addr_hash(addr);
3479 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
3480 if (!net_eq(dev_net(ifp->idev->dev), net))
3482 if (ipv6_addr_equal(&ifp->addr, addr) &&
3483 (ifp->flags & IFA_F_HOMEADDRESS)) {
3488 rcu_read_unlock_bh();
3494 * Periodic address status verification
3497 static void addrconf_verify(unsigned long foo)
3499 unsigned long now, next, next_sec, next_sched;
3500 struct inet6_ifaddr *ifp;
3504 spin_lock(&addrconf_verify_lock);
3506 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3508 del_timer(&addr_chk_timer);
3510 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3512 hlist_for_each_entry_rcu_bh(ifp,
3513 &inet6_addr_lst[i], addr_lst) {
3516 if (ifp->flags & IFA_F_PERMANENT)
3519 spin_lock(&ifp->lock);
3520 /* We try to batch several events at once. */
3521 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3523 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3524 age >= ifp->valid_lft) {
3525 spin_unlock(&ifp->lock);
3529 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3530 spin_unlock(&ifp->lock);
3532 } else if (age >= ifp->prefered_lft) {
3533 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3536 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3538 ifp->flags |= IFA_F_DEPRECATED;
3541 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3542 next = ifp->tstamp + ifp->valid_lft * HZ;
3544 spin_unlock(&ifp->lock);
3549 ipv6_ifa_notify(0, ifp);
3553 #ifdef CONFIG_IPV6_PRIVACY
3554 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3555 !(ifp->flags&IFA_F_TENTATIVE)) {
3556 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3557 ifp->idev->cnf.dad_transmits *
3558 ifp->idev->nd_parms->retrans_time / HZ;
3560 if (age >= ifp->prefered_lft - regen_advance) {
3561 struct inet6_ifaddr *ifpub = ifp->ifpub;
3562 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3563 next = ifp->tstamp + ifp->prefered_lft * HZ;
3564 if (!ifp->regen_count && ifpub) {
3567 in6_ifa_hold(ifpub);
3568 spin_unlock(&ifp->lock);
3570 spin_lock(&ifpub->lock);
3571 ifpub->regen_count = 0;
3572 spin_unlock(&ifpub->lock);
3573 ipv6_create_tempaddr(ifpub, ifp);
3578 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3579 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3580 spin_unlock(&ifp->lock);
3583 /* ifp->prefered_lft <= ifp->valid_lft */
3584 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3585 next = ifp->tstamp + ifp->prefered_lft * HZ;
3586 spin_unlock(&ifp->lock);
3591 next_sec = round_jiffies_up(next);
3594 /* If rounded timeout is accurate enough, accept it. */
3595 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3596 next_sched = next_sec;
3598 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3599 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3600 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3602 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3603 now, next, next_sec, next_sched);
3605 addr_chk_timer.expires = next_sched;
3606 add_timer(&addr_chk_timer);
3607 spin_unlock(&addrconf_verify_lock);
3608 rcu_read_unlock_bh();
3611 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
3612 struct in6_addr **peer_pfx)
3614 struct in6_addr *pfx = NULL;
3619 pfx = nla_data(addr);
3622 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3624 pfx = nla_data(local);
3630 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3631 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3632 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3633 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3637 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
3639 struct net *net = sock_net(skb->sk);
3640 struct ifaddrmsg *ifm;
3641 struct nlattr *tb[IFA_MAX+1];
3642 struct in6_addr *pfx, *peer_pfx;
3645 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3649 ifm = nlmsg_data(nlh);
3650 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
3654 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3657 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3658 u32 prefered_lft, u32 valid_lft)
3662 unsigned long timeout;
3664 if (!valid_lft || (prefered_lft > valid_lft))
3667 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3668 if (addrconf_finite_timeout(timeout)) {
3669 expires = jiffies_to_clock_t(timeout * HZ);
3670 valid_lft = timeout;
3671 flags = RTF_EXPIRES;
3675 ifa_flags |= IFA_F_PERMANENT;
3678 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3679 if (addrconf_finite_timeout(timeout)) {
3681 ifa_flags |= IFA_F_DEPRECATED;
3682 prefered_lft = timeout;
3685 spin_lock_bh(&ifp->lock);
3686 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3687 ifp->tstamp = jiffies;
3688 ifp->valid_lft = valid_lft;
3689 ifp->prefered_lft = prefered_lft;
3691 spin_unlock_bh(&ifp->lock);
3692 if (!(ifp->flags&IFA_F_TENTATIVE))
3693 ipv6_ifa_notify(0, ifp);
3695 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3703 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
3705 struct net *net = sock_net(skb->sk);
3706 struct ifaddrmsg *ifm;
3707 struct nlattr *tb[IFA_MAX+1];
3708 struct in6_addr *pfx, *peer_pfx;
3709 struct inet6_ifaddr *ifa;
3710 struct net_device *dev;
3711 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3715 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3719 ifm = nlmsg_data(nlh);
3720 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
3724 if (tb[IFA_CACHEINFO]) {
3725 struct ifa_cacheinfo *ci;
3727 ci = nla_data(tb[IFA_CACHEINFO]);
3728 valid_lft = ci->ifa_valid;
3729 preferred_lft = ci->ifa_prefered;
3731 preferred_lft = INFINITY_LIFE_TIME;
3732 valid_lft = INFINITY_LIFE_TIME;
3735 dev = __dev_get_by_index(net, ifm->ifa_index);
3739 /* We ignore other flags so far. */
3740 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3742 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3745 * It would be best to check for !NLM_F_CREATE here but
3746 * userspace alreay relies on not having to provide this.
3748 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
3749 ifm->ifa_prefixlen, ifa_flags,
3750 preferred_lft, valid_lft);
3753 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3754 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3757 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3764 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3765 u8 scope, int ifindex)
3767 struct ifaddrmsg *ifm;
3769 ifm = nlmsg_data(nlh);
3770 ifm->ifa_family = AF_INET6;
3771 ifm->ifa_prefixlen = prefixlen;
3772 ifm->ifa_flags = flags;
3773 ifm->ifa_scope = scope;
3774 ifm->ifa_index = ifindex;
3777 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3778 unsigned long tstamp, u32 preferred, u32 valid)
3780 struct ifa_cacheinfo ci;
3782 ci.cstamp = cstamp_delta(cstamp);
3783 ci.tstamp = cstamp_delta(tstamp);
3784 ci.ifa_prefered = preferred;
3785 ci.ifa_valid = valid;
3787 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3790 static inline int rt_scope(int ifa_scope)
3792 if (ifa_scope & IFA_HOST)
3793 return RT_SCOPE_HOST;
3794 else if (ifa_scope & IFA_LINK)
3795 return RT_SCOPE_LINK;
3796 else if (ifa_scope & IFA_SITE)
3797 return RT_SCOPE_SITE;
3799 return RT_SCOPE_UNIVERSE;
3802 static inline int inet6_ifaddr_msgsize(void)
3804 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3805 + nla_total_size(16) /* IFA_LOCAL */
3806 + nla_total_size(16) /* IFA_ADDRESS */
3807 + nla_total_size(sizeof(struct ifa_cacheinfo));
3810 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3811 u32 portid, u32 seq, int event, unsigned int flags)
3813 struct nlmsghdr *nlh;
3814 u32 preferred, valid;
3816 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3820 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3821 ifa->idev->dev->ifindex);
3823 if (!(ifa->flags&IFA_F_PERMANENT)) {
3824 preferred = ifa->prefered_lft;
3825 valid = ifa->valid_lft;
3826 if (preferred != INFINITY_LIFE_TIME) {
3827 long tval = (jiffies - ifa->tstamp)/HZ;
3828 if (preferred > tval)
3832 if (valid != INFINITY_LIFE_TIME) {
3840 preferred = INFINITY_LIFE_TIME;
3841 valid = INFINITY_LIFE_TIME;
3844 if (!ipv6_addr_any(&ifa->peer_addr)) {
3845 if (nla_put(skb, IFA_LOCAL, 16, &ifa->addr) < 0 ||
3846 nla_put(skb, IFA_ADDRESS, 16, &ifa->peer_addr) < 0)
3849 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0)
3852 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
3855 return nlmsg_end(skb, nlh);
3858 nlmsg_cancel(skb, nlh);
3862 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3863 u32 portid, u32 seq, int event, u16 flags)
3865 struct nlmsghdr *nlh;
3866 u8 scope = RT_SCOPE_UNIVERSE;
3867 int ifindex = ifmca->idev->dev->ifindex;
3869 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3870 scope = RT_SCOPE_SITE;
3872 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3876 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3877 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3878 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3879 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3880 nlmsg_cancel(skb, nlh);
3884 return nlmsg_end(skb, nlh);
3887 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3888 u32 portid, u32 seq, int event, unsigned int flags)
3890 struct nlmsghdr *nlh;
3891 u8 scope = RT_SCOPE_UNIVERSE;
3892 int ifindex = ifaca->aca_idev->dev->ifindex;
3894 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3895 scope = RT_SCOPE_SITE;
3897 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3901 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3902 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3903 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3904 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3905 nlmsg_cancel(skb, nlh);
3909 return nlmsg_end(skb, nlh);
3918 /* called with rcu_read_lock() */
3919 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3920 struct netlink_callback *cb, enum addr_type_t type,
3921 int s_ip_idx, int *p_ip_idx)
3923 struct ifmcaddr6 *ifmca;
3924 struct ifacaddr6 *ifaca;
3926 int ip_idx = *p_ip_idx;
3928 read_lock_bh(&idev->lock);
3930 case UNICAST_ADDR: {
3931 struct inet6_ifaddr *ifa;
3933 /* unicast address incl. temp addr */
3934 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3935 if (++ip_idx < s_ip_idx)
3937 err = inet6_fill_ifaddr(skb, ifa,
3938 NETLINK_CB(cb->skb).portid,
3944 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3948 case MULTICAST_ADDR:
3949 /* multicast address */
3950 for (ifmca = idev->mc_list; ifmca;
3951 ifmca = ifmca->next, ip_idx++) {
3952 if (ip_idx < s_ip_idx)
3954 err = inet6_fill_ifmcaddr(skb, ifmca,
3955 NETLINK_CB(cb->skb).portid,
3964 /* anycast address */
3965 for (ifaca = idev->ac_list; ifaca;
3966 ifaca = ifaca->aca_next, ip_idx++) {
3967 if (ip_idx < s_ip_idx)
3969 err = inet6_fill_ifacaddr(skb, ifaca,
3970 NETLINK_CB(cb->skb).portid,
3981 read_unlock_bh(&idev->lock);
3986 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3987 enum addr_type_t type)
3989 struct net *net = sock_net(skb->sk);
3992 int s_idx, s_ip_idx;
3993 struct net_device *dev;
3994 struct inet6_dev *idev;
3995 struct hlist_head *head;
3998 s_idx = idx = cb->args[1];
3999 s_ip_idx = ip_idx = cb->args[2];
4002 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4003 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4005 head = &net->dev_index_head[h];
4006 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4009 if (h > s_h || idx > s_idx)
4012 idev = __in6_dev_get(dev);
4016 if (in6_dump_addrs(idev, skb, cb, type,
4017 s_ip_idx, &ip_idx) <= 0)
4027 cb->args[2] = ip_idx;
4032 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4034 enum addr_type_t type = UNICAST_ADDR;
4036 return inet6_dump_addr(skb, cb, type);
4039 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4041 enum addr_type_t type = MULTICAST_ADDR;
4043 return inet6_dump_addr(skb, cb, type);
4047 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4049 enum addr_type_t type = ANYCAST_ADDR;
4051 return inet6_dump_addr(skb, cb, type);
4054 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
4056 struct net *net = sock_net(in_skb->sk);
4057 struct ifaddrmsg *ifm;
4058 struct nlattr *tb[IFA_MAX+1];
4059 struct in6_addr *addr = NULL, *peer;
4060 struct net_device *dev = NULL;
4061 struct inet6_ifaddr *ifa;
4062 struct sk_buff *skb;
4065 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4069 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4075 ifm = nlmsg_data(nlh);
4077 dev = __dev_get_by_index(net, ifm->ifa_index);
4079 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4081 err = -EADDRNOTAVAIL;
4085 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4091 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4092 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4094 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4095 WARN_ON(err == -EMSGSIZE);
4099 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4106 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4108 struct sk_buff *skb;
4109 struct net *net = dev_net(ifa->idev->dev);
4112 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4116 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4118 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4119 WARN_ON(err == -EMSGSIZE);
4123 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4127 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4130 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4131 __s32 *array, int bytes)
4133 BUG_ON(bytes < (DEVCONF_MAX * 4));
4135 memset(array, 0, bytes);
4136 array[DEVCONF_FORWARDING] = cnf->forwarding;
4137 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4138 array[DEVCONF_MTU6] = cnf->mtu6;
4139 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4140 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4141 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4142 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4143 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4144 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4145 jiffies_to_msecs(cnf->rtr_solicit_interval);
4146 array[DEVCONF_RTR_SOLICIT_DELAY] =
4147 jiffies_to_msecs(cnf->rtr_solicit_delay);
4148 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4149 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4150 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4151 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4152 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
4153 #ifdef CONFIG_IPV6_PRIVACY
4154 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4155 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4156 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4157 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4158 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4160 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4161 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4162 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4163 #ifdef CONFIG_IPV6_ROUTER_PREF
4164 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4165 array[DEVCONF_RTR_PROBE_INTERVAL] =
4166 jiffies_to_msecs(cnf->rtr_probe_interval);
4167 #ifdef CONFIG_IPV6_ROUTE_INFO
4168 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4171 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4172 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4173 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4174 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4176 #ifdef CONFIG_IPV6_MROUTE
4177 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4179 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4180 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4181 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4182 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4183 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
4186 static inline size_t inet6_ifla6_size(void)
4188 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4189 + nla_total_size(sizeof(struct ifla_cacheinfo))
4190 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4191 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4192 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4193 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
4196 static inline size_t inet6_if_nlmsg_size(void)
4198 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4199 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4200 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4201 + nla_total_size(4) /* IFLA_MTU */
4202 + nla_total_size(4) /* IFLA_LINK */
4203 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4206 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4207 int items, int bytes)
4210 int pad = bytes - sizeof(u64) * items;
4213 /* Use put_unaligned() because stats may not be aligned for u64. */
4214 put_unaligned(items, &stats[0]);
4215 for (i = 1; i < items; i++)
4216 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4218 memset(&stats[items], 0, pad);
4221 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
4222 int items, int bytes, size_t syncpoff)
4225 int pad = bytes - sizeof(u64) * items;
4228 /* Use put_unaligned() because stats may not be aligned for u64. */
4229 put_unaligned(items, &stats[0]);
4230 for (i = 1; i < items; i++)
4231 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4233 memset(&stats[items], 0, pad);
4236 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4240 case IFLA_INET6_STATS:
4241 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
4242 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
4244 case IFLA_INET6_ICMP6STATS:
4245 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
4250 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4253 struct ifla_cacheinfo ci;
4255 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4256 goto nla_put_failure;
4257 ci.max_reasm_len = IPV6_MAXPLEN;
4258 ci.tstamp = cstamp_delta(idev->tstamp);
4259 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4260 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
4261 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4262 goto nla_put_failure;
4263 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4265 goto nla_put_failure;
4266 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4268 /* XXX - MC not implemented */
4270 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4272 goto nla_put_failure;
4273 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4275 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4277 goto nla_put_failure;
4278 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4280 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4282 goto nla_put_failure;
4283 read_lock_bh(&idev->lock);
4284 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4285 read_unlock_bh(&idev->lock);
4293 static size_t inet6_get_link_af_size(const struct net_device *dev)
4295 if (!__in6_dev_get(dev))
4298 return inet6_ifla6_size();
4301 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4303 struct inet6_dev *idev = __in6_dev_get(dev);
4308 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4314 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4316 struct inet6_ifaddr *ifp;
4317 struct net_device *dev = idev->dev;
4318 bool update_rs = false;
4319 struct in6_addr ll_addr;
4323 if (ipv6_addr_any(token))
4325 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4327 if (!ipv6_accept_ra(idev))
4329 if (idev->cnf.rtr_solicits <= 0)
4332 write_lock_bh(&idev->lock);
4334 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4335 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4337 write_unlock_bh(&idev->lock);
4339 if (!idev->dead && (idev->if_flags & IF_READY) &&
4340 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4341 IFA_F_OPTIMISTIC)) {
4343 /* If we're not ready, then normal ifup will take care
4344 * of this. Otherwise, we need to request our rs here.
4346 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4350 write_lock_bh(&idev->lock);
4353 idev->if_flags |= IF_RS_SENT;
4354 idev->rs_probes = 1;
4355 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
4358 /* Well, that's kinda nasty ... */
4359 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4360 spin_lock(&ifp->lock);
4361 if (ifp->tokenized) {
4363 ifp->prefered_lft = 0;
4365 spin_unlock(&ifp->lock);
4368 write_unlock_bh(&idev->lock);
4373 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4376 struct inet6_dev *idev = __in6_dev_get(dev);
4377 struct nlattr *tb[IFLA_INET6_MAX + 1];
4380 return -EAFNOSUPPORT;
4382 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4385 if (tb[IFLA_INET6_TOKEN])
4386 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
4391 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4392 u32 portid, u32 seq, int event, unsigned int flags)
4394 struct net_device *dev = idev->dev;
4395 struct ifinfomsg *hdr;
4396 struct nlmsghdr *nlh;
4399 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
4403 hdr = nlmsg_data(nlh);
4404 hdr->ifi_family = AF_INET6;
4406 hdr->ifi_type = dev->type;
4407 hdr->ifi_index = dev->ifindex;
4408 hdr->ifi_flags = dev_get_flags(dev);
4409 hdr->ifi_change = 0;
4411 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4413 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4414 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4415 (dev->ifindex != dev->iflink &&
4416 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4417 goto nla_put_failure;
4418 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4419 if (protoinfo == NULL)
4420 goto nla_put_failure;
4422 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4423 goto nla_put_failure;
4425 nla_nest_end(skb, protoinfo);
4426 return nlmsg_end(skb, nlh);
4429 nlmsg_cancel(skb, nlh);
4433 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4435 struct net *net = sock_net(skb->sk);
4438 struct net_device *dev;
4439 struct inet6_dev *idev;
4440 struct hlist_head *head;
4443 s_idx = cb->args[1];
4446 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4448 head = &net->dev_index_head[h];
4449 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4452 idev = __in6_dev_get(dev);
4455 if (inet6_fill_ifinfo(skb, idev,
4456 NETLINK_CB(cb->skb).portid,
4458 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4472 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4474 struct sk_buff *skb;
4475 struct net *net = dev_net(idev->dev);
4478 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4482 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4484 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4485 WARN_ON(err == -EMSGSIZE);
4489 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4493 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4496 static inline size_t inet6_prefix_nlmsg_size(void)
4498 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4499 + nla_total_size(sizeof(struct in6_addr))
4500 + nla_total_size(sizeof(struct prefix_cacheinfo));
4503 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4504 struct prefix_info *pinfo, u32 portid, u32 seq,
4505 int event, unsigned int flags)
4507 struct prefixmsg *pmsg;
4508 struct nlmsghdr *nlh;
4509 struct prefix_cacheinfo ci;
4511 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
4515 pmsg = nlmsg_data(nlh);
4516 pmsg->prefix_family = AF_INET6;
4517 pmsg->prefix_pad1 = 0;
4518 pmsg->prefix_pad2 = 0;
4519 pmsg->prefix_ifindex = idev->dev->ifindex;
4520 pmsg->prefix_len = pinfo->prefix_len;
4521 pmsg->prefix_type = pinfo->type;
4522 pmsg->prefix_pad3 = 0;
4523 pmsg->prefix_flags = 0;
4525 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4526 if (pinfo->autoconf)
4527 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4529 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4530 goto nla_put_failure;
4531 ci.preferred_time = ntohl(pinfo->prefered);
4532 ci.valid_time = ntohl(pinfo->valid);
4533 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4534 goto nla_put_failure;
4535 return nlmsg_end(skb, nlh);
4538 nlmsg_cancel(skb, nlh);
4542 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4543 struct prefix_info *pinfo)
4545 struct sk_buff *skb;
4546 struct net *net = dev_net(idev->dev);
4549 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4553 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4555 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4556 WARN_ON(err == -EMSGSIZE);
4560 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4564 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4567 static void update_valid_ll_addr_cnt(struct inet6_ifaddr *ifp, int count)
4569 write_lock_bh(&ifp->idev->lock);
4570 spin_lock(&ifp->lock);
4571 if (((ifp->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|
4572 IFA_F_DADFAILED)) == IFA_F_PERMANENT) &&
4573 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL))
4574 ifp->idev->valid_ll_addr_cnt += count;
4575 WARN_ON(ifp->idev->valid_ll_addr_cnt < 0);
4576 spin_unlock(&ifp->lock);
4577 write_unlock_bh(&ifp->idev->lock);
4580 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4582 struct net *net = dev_net(ifp->idev->dev);
4584 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4588 update_valid_ll_addr_cnt(ifp, 1);
4591 * If the address was optimistic
4592 * we inserted the route at the start of
4593 * our DAD process, so we don't need
4596 if (!(ifp->rt->rt6i_node))
4597 ip6_ins_rt(ifp->rt);
4598 if (ifp->idev->cnf.forwarding)
4599 addrconf_join_anycast(ifp);
4600 if (!ipv6_addr_any(&ifp->peer_addr))
4601 addrconf_prefix_route(&ifp->peer_addr, 128,
4602 ifp->idev->dev, 0, 0);
4605 update_valid_ll_addr_cnt(ifp, -1);
4607 if (ifp->idev->cnf.forwarding)
4608 addrconf_leave_anycast(ifp);
4609 addrconf_leave_solict(ifp->idev, &ifp->addr);
4610 if (!ipv6_addr_any(&ifp->peer_addr)) {
4611 struct rt6_info *rt;
4612 struct net_device *dev = ifp->idev->dev;
4614 rt = rt6_lookup(dev_net(dev), &ifp->peer_addr, NULL,
4622 dst_hold(&ifp->rt->dst);
4624 if (ip6_del_rt(ifp->rt))
4625 dst_free(&ifp->rt->dst);
4628 atomic_inc(&net->ipv6.dev_addr_genid);
4629 rt_genid_bump_ipv6(net);
4632 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4635 if (likely(ifp->idev->dead == 0))
4636 __ipv6_ifa_notify(event, ifp);
4637 rcu_read_unlock_bh();
4640 #ifdef CONFIG_SYSCTL
4643 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
4644 void __user *buffer, size_t *lenp, loff_t *ppos)
4646 int *valp = ctl->data;
4649 struct ctl_table lctl;
4653 * ctl->data points to idev->cnf.forwarding, we should
4654 * not modify it until we get the rtnl lock.
4659 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4662 ret = addrconf_fixup_forwarding(ctl, valp, val);
4668 static void dev_disable_change(struct inet6_dev *idev)
4670 struct netdev_notifier_info info;
4672 if (!idev || !idev->dev)
4675 netdev_notifier_info_init(&info, idev->dev);
4676 if (idev->cnf.disable_ipv6)
4677 addrconf_notify(NULL, NETDEV_DOWN, &info);
4679 addrconf_notify(NULL, NETDEV_UP, &info);
4682 static void addrconf_disable_change(struct net *net, __s32 newf)
4684 struct net_device *dev;
4685 struct inet6_dev *idev;
4688 for_each_netdev_rcu(net, dev) {
4689 idev = __in6_dev_get(dev);
4691 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4692 idev->cnf.disable_ipv6 = newf;
4694 dev_disable_change(idev);
4700 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
4705 if (!rtnl_trylock())
4706 return restart_syscall();
4708 net = (struct net *)table->extra2;
4712 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4717 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4718 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4719 addrconf_disable_change(net, newf);
4720 } else if ((!newf) ^ (!old))
4721 dev_disable_change((struct inet6_dev *)table->extra1);
4728 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
4729 void __user *buffer, size_t *lenp, loff_t *ppos)
4731 int *valp = ctl->data;
4734 struct ctl_table lctl;
4738 * ctl->data points to idev->cnf.disable_ipv6, we should
4739 * not modify it until we get the rtnl lock.
4744 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4747 ret = addrconf_disable_ipv6(ctl, valp, val);
4753 static struct addrconf_sysctl_table
4755 struct ctl_table_header *sysctl_header;
4756 struct ctl_table addrconf_vars[DEVCONF_MAX+1];
4757 } addrconf_sysctl __read_mostly = {
4758 .sysctl_header = NULL,
4761 .procname = "forwarding",
4762 .data = &ipv6_devconf.forwarding,
4763 .maxlen = sizeof(int),
4765 .proc_handler = addrconf_sysctl_forward,
4768 .procname = "hop_limit",
4769 .data = &ipv6_devconf.hop_limit,
4770 .maxlen = sizeof(int),
4772 .proc_handler = proc_dointvec,
4776 .data = &ipv6_devconf.mtu6,
4777 .maxlen = sizeof(int),
4779 .proc_handler = proc_dointvec,
4782 .procname = "accept_ra",
4783 .data = &ipv6_devconf.accept_ra,
4784 .maxlen = sizeof(int),
4786 .proc_handler = proc_dointvec,
4789 .procname = "accept_redirects",
4790 .data = &ipv6_devconf.accept_redirects,
4791 .maxlen = sizeof(int),
4793 .proc_handler = proc_dointvec,
4796 .procname = "autoconf",
4797 .data = &ipv6_devconf.autoconf,
4798 .maxlen = sizeof(int),
4800 .proc_handler = proc_dointvec,
4803 .procname = "dad_transmits",
4804 .data = &ipv6_devconf.dad_transmits,
4805 .maxlen = sizeof(int),
4807 .proc_handler = proc_dointvec,
4810 .procname = "router_solicitations",
4811 .data = &ipv6_devconf.rtr_solicits,
4812 .maxlen = sizeof(int),
4814 .proc_handler = proc_dointvec,
4817 .procname = "router_solicitation_interval",
4818 .data = &ipv6_devconf.rtr_solicit_interval,
4819 .maxlen = sizeof(int),
4821 .proc_handler = proc_dointvec_jiffies,
4824 .procname = "router_solicitation_delay",
4825 .data = &ipv6_devconf.rtr_solicit_delay,
4826 .maxlen = sizeof(int),
4828 .proc_handler = proc_dointvec_jiffies,
4831 .procname = "force_mld_version",
4832 .data = &ipv6_devconf.force_mld_version,
4833 .maxlen = sizeof(int),
4835 .proc_handler = proc_dointvec,
4838 .procname = "mldv1_unsolicited_report_interval",
4840 &ipv6_devconf.mldv1_unsolicited_report_interval,
4841 .maxlen = sizeof(int),
4843 .proc_handler = proc_dointvec_ms_jiffies,
4846 .procname = "mldv2_unsolicited_report_interval",
4848 &ipv6_devconf.mldv2_unsolicited_report_interval,
4849 .maxlen = sizeof(int),
4851 .proc_handler = proc_dointvec_ms_jiffies,
4853 #ifdef CONFIG_IPV6_PRIVACY
4855 .procname = "use_tempaddr",
4856 .data = &ipv6_devconf.use_tempaddr,
4857 .maxlen = sizeof(int),
4859 .proc_handler = proc_dointvec,
4862 .procname = "temp_valid_lft",
4863 .data = &ipv6_devconf.temp_valid_lft,
4864 .maxlen = sizeof(int),
4866 .proc_handler = proc_dointvec,
4869 .procname = "temp_prefered_lft",
4870 .data = &ipv6_devconf.temp_prefered_lft,
4871 .maxlen = sizeof(int),
4873 .proc_handler = proc_dointvec,
4876 .procname = "regen_max_retry",
4877 .data = &ipv6_devconf.regen_max_retry,
4878 .maxlen = sizeof(int),
4880 .proc_handler = proc_dointvec,
4883 .procname = "max_desync_factor",
4884 .data = &ipv6_devconf.max_desync_factor,
4885 .maxlen = sizeof(int),
4887 .proc_handler = proc_dointvec,
4891 .procname = "max_addresses",
4892 .data = &ipv6_devconf.max_addresses,
4893 .maxlen = sizeof(int),
4895 .proc_handler = proc_dointvec,
4898 .procname = "accept_ra_defrtr",
4899 .data = &ipv6_devconf.accept_ra_defrtr,
4900 .maxlen = sizeof(int),
4902 .proc_handler = proc_dointvec,
4905 .procname = "accept_ra_pinfo",
4906 .data = &ipv6_devconf.accept_ra_pinfo,
4907 .maxlen = sizeof(int),
4909 .proc_handler = proc_dointvec,
4911 #ifdef CONFIG_IPV6_ROUTER_PREF
4913 .procname = "accept_ra_rtr_pref",
4914 .data = &ipv6_devconf.accept_ra_rtr_pref,
4915 .maxlen = sizeof(int),
4917 .proc_handler = proc_dointvec,
4920 .procname = "router_probe_interval",
4921 .data = &ipv6_devconf.rtr_probe_interval,
4922 .maxlen = sizeof(int),
4924 .proc_handler = proc_dointvec_jiffies,
4926 #ifdef CONFIG_IPV6_ROUTE_INFO
4928 .procname = "accept_ra_rt_info_max_plen",
4929 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4930 .maxlen = sizeof(int),
4932 .proc_handler = proc_dointvec,
4937 .procname = "proxy_ndp",
4938 .data = &ipv6_devconf.proxy_ndp,
4939 .maxlen = sizeof(int),
4941 .proc_handler = proc_dointvec,
4944 .procname = "accept_source_route",
4945 .data = &ipv6_devconf.accept_source_route,
4946 .maxlen = sizeof(int),
4948 .proc_handler = proc_dointvec,
4950 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4952 .procname = "optimistic_dad",
4953 .data = &ipv6_devconf.optimistic_dad,
4954 .maxlen = sizeof(int),
4956 .proc_handler = proc_dointvec,
4960 #ifdef CONFIG_IPV6_MROUTE
4962 .procname = "mc_forwarding",
4963 .data = &ipv6_devconf.mc_forwarding,
4964 .maxlen = sizeof(int),
4966 .proc_handler = proc_dointvec,
4970 .procname = "disable_ipv6",
4971 .data = &ipv6_devconf.disable_ipv6,
4972 .maxlen = sizeof(int),
4974 .proc_handler = addrconf_sysctl_disable,
4977 .procname = "accept_dad",
4978 .data = &ipv6_devconf.accept_dad,
4979 .maxlen = sizeof(int),
4981 .proc_handler = proc_dointvec,
4984 .procname = "force_tllao",
4985 .data = &ipv6_devconf.force_tllao,
4986 .maxlen = sizeof(int),
4988 .proc_handler = proc_dointvec
4991 .procname = "ndisc_notify",
4992 .data = &ipv6_devconf.ndisc_notify,
4993 .maxlen = sizeof(int),
4995 .proc_handler = proc_dointvec
4998 .procname = "suppress_frag_ndisc",
4999 .data = &ipv6_devconf.suppress_frag_ndisc,
5000 .maxlen = sizeof(int),
5002 .proc_handler = proc_dointvec
5010 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
5011 struct inet6_dev *idev, struct ipv6_devconf *p)
5014 struct addrconf_sysctl_table *t;
5015 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
5017 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
5021 for (i = 0; t->addrconf_vars[i].data; i++) {
5022 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
5023 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
5024 t->addrconf_vars[i].extra2 = net;
5027 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
5029 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
5030 if (t->sysctl_header == NULL)
5042 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5044 struct addrconf_sysctl_table *t;
5046 if (p->sysctl == NULL)
5051 unregister_net_sysctl_table(t->sysctl_header);
5055 static void addrconf_sysctl_register(struct inet6_dev *idev)
5057 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
5058 &ndisc_ifinfo_sysctl_change);
5059 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
5063 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
5065 __addrconf_sysctl_unregister(&idev->cnf);
5066 neigh_sysctl_unregister(idev->nd_parms);
5072 static int __net_init addrconf_init_net(struct net *net)
5075 struct ipv6_devconf *all, *dflt;
5077 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
5081 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
5083 goto err_alloc_dflt;
5085 /* these will be inherited by all namespaces */
5086 dflt->autoconf = ipv6_defaults.autoconf;
5087 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
5089 net->ipv6.devconf_all = all;
5090 net->ipv6.devconf_dflt = dflt;
5092 #ifdef CONFIG_SYSCTL
5093 err = __addrconf_sysctl_register(net, "all", NULL, all);
5097 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
5103 #ifdef CONFIG_SYSCTL
5105 __addrconf_sysctl_unregister(all);
5115 static void __net_exit addrconf_exit_net(struct net *net)
5117 #ifdef CONFIG_SYSCTL
5118 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5119 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5121 if (!net_eq(net, &init_net)) {
5122 kfree(net->ipv6.devconf_dflt);
5123 kfree(net->ipv6.devconf_all);
5127 static struct pernet_operations addrconf_ops = {
5128 .init = addrconf_init_net,
5129 .exit = addrconf_exit_net,
5132 static struct rtnl_af_ops inet6_ops = {
5134 .fill_link_af = inet6_fill_link_af,
5135 .get_link_af_size = inet6_get_link_af_size,
5136 .set_link_af = inet6_set_link_af,
5140 * Init / cleanup code
5143 int __init addrconf_init(void)
5147 err = ipv6_addr_label_init();
5149 pr_crit("%s: cannot initialize default policy table: %d\n",
5154 err = register_pernet_subsys(&addrconf_ops);
5158 /* The addrconf netdev notifier requires that loopback_dev
5159 * has it's ipv6 private information allocated and setup
5160 * before it can bring up and give link-local addresses
5161 * to other devices which are up.
5163 * Unfortunately, loopback_dev is not necessarily the first
5164 * entry in the global dev_base list of net devices. In fact,
5165 * it is likely to be the very last entry on that list.
5166 * So this causes the notifier registry below to try and
5167 * give link-local addresses to all devices besides loopback_dev
5168 * first, then loopback_dev, which cases all the non-loopback_dev
5169 * devices to fail to get a link-local address.
5171 * So, as a temporary fix, allocate the ipv6 structure for
5172 * loopback_dev first by hand.
5173 * Longer term, all of the dependencies ipv6 has upon the loopback
5174 * device and it being up should be removed.
5177 if (!ipv6_add_dev(init_net.loopback_dev))
5183 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5184 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5186 register_netdevice_notifier(&ipv6_dev_notf);
5190 err = rtnl_af_register(&inet6_ops);
5194 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5199 /* Only the first call to __rtnl_register can fail */
5200 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5201 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5202 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5203 inet6_dump_ifaddr, NULL);
5204 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5205 inet6_dump_ifmcaddr, NULL);
5206 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5207 inet6_dump_ifacaddr, NULL);
5208 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
5209 inet6_netconf_dump_devconf, NULL);
5211 ipv6_addr_label_rtnl_register();
5215 rtnl_af_unregister(&inet6_ops);
5217 unregister_netdevice_notifier(&ipv6_dev_notf);
5219 unregister_pernet_subsys(&addrconf_ops);
5221 ipv6_addr_label_cleanup();
5226 void addrconf_cleanup(void)
5228 struct net_device *dev;
5231 unregister_netdevice_notifier(&ipv6_dev_notf);
5232 unregister_pernet_subsys(&addrconf_ops);
5233 ipv6_addr_label_cleanup();
5237 __rtnl_af_unregister(&inet6_ops);
5239 /* clean dev list */
5240 for_each_netdev(&init_net, dev) {
5241 if (__in6_dev_get(dev) == NULL)
5243 addrconf_ifdown(dev, 1);
5245 addrconf_ifdown(init_net.loopback_dev, 2);
5250 spin_lock_bh(&addrconf_hash_lock);
5251 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5252 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5253 spin_unlock_bh(&addrconf_hash_lock);
5255 del_timer(&addr_chk_timer);