1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * IPv6 Address [auto]configuration
4 * Linux INET6 implementation
7 * Pedro Roque <roque@di.fc.ul.pt>
8 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
14 * Janos Farkas : delete timer on ifdown
15 * <chexum@bankinf.banki.hu>
16 * Andi Kleen : kill double kfree on module
18 * Maciej W. Rozycki : FDDI support
19 * sekiya@USAGI : Don't send too many RS
21 * yoshfuji@USAGI : Fixed interval between DAD
23 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
24 * address validation timer.
25 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
27 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
28 * address on a same interface.
29 * YOSHIFUJI Hideaki @USAGI : ARCnet support
30 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
32 * YOSHIFUJI Hideaki @USAGI : improved source address
33 * selection; consider scope,
37 #define pr_fmt(fmt) "IPv6: " fmt
39 #include <linux/errno.h>
40 #include <linux/types.h>
41 #include <linux/kernel.h>
42 #include <linux/sched/signal.h>
43 #include <linux/socket.h>
44 #include <linux/sockios.h>
45 #include <linux/net.h>
46 #include <linux/inet.h>
47 #include <linux/in6.h>
48 #include <linux/netdevice.h>
49 #include <linux/if_addr.h>
50 #include <linux/if_arp.h>
51 #include <linux/if_arcnet.h>
52 #include <linux/if_infiniband.h>
53 #include <linux/route.h>
54 #include <linux/inetdevice.h>
55 #include <linux/init.h>
56 #include <linux/slab.h>
58 #include <linux/sysctl.h>
60 #include <linux/capability.h>
61 #include <linux/delay.h>
62 #include <linux/notifier.h>
63 #include <linux/string.h>
64 #include <linux/hash.h>
66 #include <net/net_namespace.h>
70 #include <net/6lowpan.h>
71 #include <net/firewire.h>
73 #include <net/protocol.h>
74 #include <net/ndisc.h>
75 #include <net/ip6_route.h>
76 #include <net/addrconf.h>
79 #include <net/netlink.h>
80 #include <net/pkt_sched.h>
81 #include <net/l3mdev.h>
82 #include <linux/if_tunnel.h>
83 #include <linux/rtnetlink.h>
84 #include <linux/netconf.h>
85 #include <linux/random.h>
86 #include <linux/uaccess.h>
87 #include <asm/unaligned.h>
89 #include <linux/proc_fs.h>
90 #include <linux/seq_file.h>
91 #include <linux/export.h>
92 #include <linux/ioam6.h>
94 #define INFINITY_LIFE_TIME 0xFFFFFFFF
96 #define IPV6_MAX_STRLEN \
97 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
99 static inline u32 cstamp_delta(unsigned long cstamp)
101 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
104 static inline s32 rfc3315_s14_backoff_init(s32 irt)
106 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */
107 u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt;
108 do_div(tmp, 1000000);
112 static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt)
114 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */
115 u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt;
116 do_div(tmp, 1000000);
117 if ((s32)tmp > mrt) {
118 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */
119 tmp = (900000 + prandom_u32() % 200001) * (u64)mrt;
120 do_div(tmp, 1000000);
126 static int addrconf_sysctl_register(struct inet6_dev *idev);
127 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
129 static inline int addrconf_sysctl_register(struct inet6_dev *idev)
134 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
139 static void ipv6_gen_rnd_iid(struct in6_addr *addr);
141 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
142 static int ipv6_count_addresses(const struct inet6_dev *idev);
143 static int ipv6_generate_stable_address(struct in6_addr *addr,
145 const struct inet6_dev *idev);
147 #define IN6_ADDR_HSIZE_SHIFT 8
148 #define IN6_ADDR_HSIZE (1 << IN6_ADDR_HSIZE_SHIFT)
150 static void addrconf_verify(struct net *net);
151 static void addrconf_verify_rtnl(struct net *net);
153 static struct workqueue_struct *addrconf_wq;
155 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
156 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
158 static void addrconf_type_change(struct net_device *dev,
159 unsigned long event);
160 static int addrconf_ifdown(struct net_device *dev, bool unregister);
162 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
164 const struct net_device *dev,
165 u32 flags, u32 noflags,
168 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
169 static void addrconf_dad_work(struct work_struct *w);
170 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
172 static void addrconf_dad_run(struct inet6_dev *idev, bool restart);
173 static void addrconf_rs_timer(struct timer_list *t);
174 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
175 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
177 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
178 struct prefix_info *pinfo);
180 static struct ipv6_devconf ipv6_devconf __read_mostly = {
182 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
183 .mtu6 = IPV6_MIN_MTU,
185 .accept_redirects = 1,
187 .force_mld_version = 0,
188 .mldv1_unsolicited_report_interval = 10 * HZ,
189 .mldv2_unsolicited_report_interval = HZ,
191 .rtr_solicits = MAX_RTR_SOLICITATIONS,
192 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
193 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
194 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
196 .temp_valid_lft = TEMP_VALID_LIFETIME,
197 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
198 .regen_max_retry = REGEN_MAX_RETRY,
199 .max_desync_factor = MAX_DESYNC_FACTOR,
200 .max_addresses = IPV6_MAX_ADDRESSES,
201 .accept_ra_defrtr = 1,
202 .ra_defrtr_metric = IP6_RT_PRIO_USER,
203 .accept_ra_from_local = 0,
204 .accept_ra_min_hop_limit= 1,
205 .accept_ra_pinfo = 1,
206 #ifdef CONFIG_IPV6_ROUTER_PREF
207 .accept_ra_rtr_pref = 1,
208 .rtr_probe_interval = 60 * HZ,
209 #ifdef CONFIG_IPV6_ROUTE_INFO
210 .accept_ra_rt_info_min_plen = 0,
211 .accept_ra_rt_info_max_plen = 0,
215 .accept_source_route = 0, /* we do not accept RH0 by default. */
218 .suppress_frag_ndisc = 1,
221 .initialized = false,
223 .use_oif_addrs_only = 0,
224 .ignore_routes_with_linkdown = 0,
225 .keep_addr_on_down = 0,
227 #ifdef CONFIG_IPV6_SEG6_HMAC
228 .seg6_require_hmac = 0,
231 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
233 .rpl_seg_enabled = 0,
235 .ioam6_id = IOAM6_DEFAULT_IF_ID,
236 .ioam6_id_wide = IOAM6_DEFAULT_IF_ID_WIDE,
237 .ndisc_evict_nocarrier = 1,
240 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
242 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
243 .mtu6 = IPV6_MIN_MTU,
245 .accept_redirects = 1,
247 .force_mld_version = 0,
248 .mldv1_unsolicited_report_interval = 10 * HZ,
249 .mldv2_unsolicited_report_interval = HZ,
251 .rtr_solicits = MAX_RTR_SOLICITATIONS,
252 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
253 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
254 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
256 .temp_valid_lft = TEMP_VALID_LIFETIME,
257 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
258 .regen_max_retry = REGEN_MAX_RETRY,
259 .max_desync_factor = MAX_DESYNC_FACTOR,
260 .max_addresses = IPV6_MAX_ADDRESSES,
261 .accept_ra_defrtr = 1,
262 .ra_defrtr_metric = IP6_RT_PRIO_USER,
263 .accept_ra_from_local = 0,
264 .accept_ra_min_hop_limit= 1,
265 .accept_ra_pinfo = 1,
266 #ifdef CONFIG_IPV6_ROUTER_PREF
267 .accept_ra_rtr_pref = 1,
268 .rtr_probe_interval = 60 * HZ,
269 #ifdef CONFIG_IPV6_ROUTE_INFO
270 .accept_ra_rt_info_min_plen = 0,
271 .accept_ra_rt_info_max_plen = 0,
275 .accept_source_route = 0, /* we do not accept RH0 by default. */
278 .suppress_frag_ndisc = 1,
281 .initialized = false,
283 .use_oif_addrs_only = 0,
284 .ignore_routes_with_linkdown = 0,
285 .keep_addr_on_down = 0,
287 #ifdef CONFIG_IPV6_SEG6_HMAC
288 .seg6_require_hmac = 0,
291 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
293 .rpl_seg_enabled = 0,
295 .ioam6_id = IOAM6_DEFAULT_IF_ID,
296 .ioam6_id_wide = IOAM6_DEFAULT_IF_ID_WIDE,
297 .ndisc_evict_nocarrier = 1,
300 /* Check if link is ready: is it up and is a valid qdisc available */
301 static inline bool addrconf_link_ready(const struct net_device *dev)
303 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev);
306 static void addrconf_del_rs_timer(struct inet6_dev *idev)
308 if (del_timer(&idev->rs_timer))
312 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
314 if (cancel_delayed_work(&ifp->dad_work))
318 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
321 if (!timer_pending(&idev->rs_timer))
323 mod_timer(&idev->rs_timer, jiffies + when);
326 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
330 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay))
334 static int snmp6_alloc_dev(struct inet6_dev *idev)
338 idev->stats.ipv6 = alloc_percpu_gfp(struct ipstats_mib, GFP_KERNEL_ACCOUNT);
339 if (!idev->stats.ipv6)
342 for_each_possible_cpu(i) {
343 struct ipstats_mib *addrconf_stats;
344 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
345 u64_stats_init(&addrconf_stats->syncp);
349 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
351 if (!idev->stats.icmpv6dev)
353 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
355 if (!idev->stats.icmpv6msgdev)
361 kfree(idev->stats.icmpv6dev);
363 free_percpu(idev->stats.ipv6);
368 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
370 struct inet6_dev *ndev;
375 if (dev->mtu < IPV6_MIN_MTU && dev != blackhole_netdev)
376 return ERR_PTR(-EINVAL);
378 ndev = kzalloc(sizeof(*ndev), GFP_KERNEL_ACCOUNT);
382 rwlock_init(&ndev->lock);
384 INIT_LIST_HEAD(&ndev->addr_list);
385 timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0);
386 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
388 if (ndev->cnf.stable_secret.initialized)
389 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
391 ndev->cnf.mtu6 = dev->mtu;
393 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
394 if (!ndev->nd_parms) {
398 if (ndev->cnf.forwarding)
399 dev_disable_lro(dev);
400 /* We refer to the device */
401 dev_hold_track(dev, &ndev->dev_tracker, GFP_KERNEL);
403 if (snmp6_alloc_dev(ndev) < 0) {
404 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n",
406 neigh_parms_release(&nd_tbl, ndev->nd_parms);
407 dev_put_track(dev, &ndev->dev_tracker);
412 if (dev != blackhole_netdev) {
413 if (snmp6_register_dev(ndev) < 0) {
414 netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n",
415 __func__, dev->name);
419 /* One reference from device. */
420 refcount_set(&ndev->refcnt, 1);
422 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
423 ndev->cnf.accept_dad = -1;
425 #if IS_ENABLED(CONFIG_IPV6_SIT)
426 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
427 pr_info("%s: Disabled Multicast RS\n", dev->name);
428 ndev->cnf.rtr_solicits = 0;
432 INIT_LIST_HEAD(&ndev->tempaddr_list);
433 ndev->desync_factor = U32_MAX;
434 if ((dev->flags&IFF_LOOPBACK) ||
435 dev->type == ARPHRD_TUNNEL ||
436 dev->type == ARPHRD_TUNNEL6 ||
437 dev->type == ARPHRD_SIT ||
438 dev->type == ARPHRD_NONE) {
439 ndev->cnf.use_tempaddr = -1;
442 ndev->token = in6addr_any;
444 if (netif_running(dev) && addrconf_link_ready(dev))
445 ndev->if_flags |= IF_READY;
447 ipv6_mc_init_dev(ndev);
448 ndev->tstamp = jiffies;
449 if (dev != blackhole_netdev) {
450 err = addrconf_sysctl_register(ndev);
452 ipv6_mc_destroy_dev(ndev);
453 snmp6_unregister_dev(ndev);
457 /* protected by rtnl_lock */
458 rcu_assign_pointer(dev->ip6_ptr, ndev);
460 if (dev != blackhole_netdev) {
461 /* Join interface-local all-node multicast group */
462 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
464 /* Join all-node multicast group */
465 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
467 /* Join all-router multicast group if forwarding is set */
468 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
469 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
474 neigh_parms_release(&nd_tbl, ndev->nd_parms);
476 in6_dev_finish_destroy(ndev);
480 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
482 struct inet6_dev *idev;
486 idev = __in6_dev_get(dev);
488 idev = ipv6_add_dev(dev);
493 if (dev->flags&IFF_UP)
498 static int inet6_netconf_msgsize_devconf(int type)
500 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
501 + nla_total_size(4); /* NETCONFA_IFINDEX */
504 if (type == NETCONFA_ALL)
507 if (all || type == NETCONFA_FORWARDING)
508 size += nla_total_size(4);
509 #ifdef CONFIG_IPV6_MROUTE
510 if (all || type == NETCONFA_MC_FORWARDING)
511 size += nla_total_size(4);
513 if (all || type == NETCONFA_PROXY_NEIGH)
514 size += nla_total_size(4);
516 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
517 size += nla_total_size(4);
522 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
523 struct ipv6_devconf *devconf, u32 portid,
524 u32 seq, int event, unsigned int flags,
527 struct nlmsghdr *nlh;
528 struct netconfmsg *ncm;
531 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
536 if (type == NETCONFA_ALL)
539 ncm = nlmsg_data(nlh);
540 ncm->ncm_family = AF_INET6;
542 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
543 goto nla_put_failure;
548 if ((all || type == NETCONFA_FORWARDING) &&
549 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
550 goto nla_put_failure;
551 #ifdef CONFIG_IPV6_MROUTE
552 if ((all || type == NETCONFA_MC_FORWARDING) &&
553 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
554 atomic_read(&devconf->mc_forwarding)) < 0)
555 goto nla_put_failure;
557 if ((all || type == NETCONFA_PROXY_NEIGH) &&
558 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
559 goto nla_put_failure;
561 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
562 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
563 devconf->ignore_routes_with_linkdown) < 0)
564 goto nla_put_failure;
571 nlmsg_cancel(skb, nlh);
575 void inet6_netconf_notify_devconf(struct net *net, int event, int type,
576 int ifindex, struct ipv6_devconf *devconf)
581 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL);
585 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
588 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
589 WARN_ON(err == -EMSGSIZE);
593 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL);
596 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
599 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
600 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
601 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
602 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
603 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
606 static int inet6_netconf_valid_get_req(struct sk_buff *skb,
607 const struct nlmsghdr *nlh,
609 struct netlink_ext_ack *extack)
613 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) {
614 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf get request");
618 if (!netlink_strict_get_check(skb))
619 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg),
621 devconf_ipv6_policy, extack);
623 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg),
625 devconf_ipv6_policy, extack);
629 for (i = 0; i <= NETCONFA_MAX; i++) {
634 case NETCONFA_IFINDEX:
637 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request");
645 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
646 struct nlmsghdr *nlh,
647 struct netlink_ext_ack *extack)
649 struct net *net = sock_net(in_skb->sk);
650 struct nlattr *tb[NETCONFA_MAX+1];
651 struct inet6_dev *in6_dev = NULL;
652 struct net_device *dev = NULL;
654 struct ipv6_devconf *devconf;
658 err = inet6_netconf_valid_get_req(in_skb, nlh, tb, extack);
662 if (!tb[NETCONFA_IFINDEX])
666 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
668 case NETCONFA_IFINDEX_ALL:
669 devconf = net->ipv6.devconf_all;
671 case NETCONFA_IFINDEX_DEFAULT:
672 devconf = net->ipv6.devconf_dflt;
675 dev = dev_get_by_index(net, ifindex);
678 in6_dev = in6_dev_get(dev);
681 devconf = &in6_dev->cnf;
686 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL);
690 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
691 NETLINK_CB(in_skb).portid,
692 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
695 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
696 WARN_ON(err == -EMSGSIZE);
700 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
703 in6_dev_put(in6_dev);
708 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
709 struct netlink_callback *cb)
711 const struct nlmsghdr *nlh = cb->nlh;
712 struct net *net = sock_net(skb->sk);
715 struct net_device *dev;
716 struct inet6_dev *idev;
717 struct hlist_head *head;
719 if (cb->strict_check) {
720 struct netlink_ext_ack *extack = cb->extack;
721 struct netconfmsg *ncm;
723 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) {
724 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request");
728 if (nlmsg_attrlen(nlh, sizeof(*ncm))) {
729 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request");
735 s_idx = idx = cb->args[1];
737 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
739 head = &net->dev_index_head[h];
741 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
743 hlist_for_each_entry_rcu(dev, head, index_hlist) {
746 idev = __in6_dev_get(dev);
750 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
752 NETLINK_CB(cb->skb).portid,
760 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
766 if (h == NETDEV_HASHENTRIES) {
767 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
768 net->ipv6.devconf_all,
769 NETLINK_CB(cb->skb).portid,
771 RTM_NEWNETCONF, NLM_F_MULTI,
777 if (h == NETDEV_HASHENTRIES + 1) {
778 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
779 net->ipv6.devconf_dflt,
780 NETLINK_CB(cb->skb).portid,
782 RTM_NEWNETCONF, NLM_F_MULTI,
796 static void dev_forward_change(struct inet6_dev *idev)
798 struct net_device *dev;
799 struct inet6_ifaddr *ifa;
800 LIST_HEAD(tmp_addr_list);
805 if (idev->cnf.forwarding)
806 dev_disable_lro(dev);
807 if (dev->flags & IFF_MULTICAST) {
808 if (idev->cnf.forwarding) {
809 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
810 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
811 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
813 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
814 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
815 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
819 read_lock_bh(&idev->lock);
820 list_for_each_entry(ifa, &idev->addr_list, if_list) {
821 if (ifa->flags&IFA_F_TENTATIVE)
823 list_add_tail(&ifa->if_list_aux, &tmp_addr_list);
825 read_unlock_bh(&idev->lock);
827 while (!list_empty(&tmp_addr_list)) {
828 ifa = list_first_entry(&tmp_addr_list,
829 struct inet6_ifaddr, if_list_aux);
830 list_del(&ifa->if_list_aux);
831 if (idev->cnf.forwarding)
832 addrconf_join_anycast(ifa);
834 addrconf_leave_anycast(ifa);
837 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
839 dev->ifindex, &idev->cnf);
843 static void addrconf_forward_change(struct net *net, __s32 newf)
845 struct net_device *dev;
846 struct inet6_dev *idev;
848 for_each_netdev(net, dev) {
849 idev = __in6_dev_get(dev);
851 int changed = (!idev->cnf.forwarding) ^ (!newf);
852 idev->cnf.forwarding = newf;
854 dev_forward_change(idev);
859 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
865 return restart_syscall();
867 net = (struct net *)table->extra2;
871 if (p == &net->ipv6.devconf_dflt->forwarding) {
872 if ((!newf) ^ (!old))
873 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
875 NETCONFA_IFINDEX_DEFAULT,
876 net->ipv6.devconf_dflt);
881 if (p == &net->ipv6.devconf_all->forwarding) {
882 int old_dflt = net->ipv6.devconf_dflt->forwarding;
884 net->ipv6.devconf_dflt->forwarding = newf;
885 if ((!newf) ^ (!old_dflt))
886 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
888 NETCONFA_IFINDEX_DEFAULT,
889 net->ipv6.devconf_dflt);
891 addrconf_forward_change(net, newf);
892 if ((!newf) ^ (!old))
893 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
895 NETCONFA_IFINDEX_ALL,
896 net->ipv6.devconf_all);
897 } else if ((!newf) ^ (!old))
898 dev_forward_change((struct inet6_dev *)table->extra1);
902 rt6_purge_dflt_routers(net);
906 static void addrconf_linkdown_change(struct net *net, __s32 newf)
908 struct net_device *dev;
909 struct inet6_dev *idev;
911 for_each_netdev(net, dev) {
912 idev = __in6_dev_get(dev);
914 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
916 idev->cnf.ignore_routes_with_linkdown = newf;
918 inet6_netconf_notify_devconf(dev_net(dev),
920 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
927 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
933 return restart_syscall();
935 net = (struct net *)table->extra2;
939 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
940 if ((!newf) ^ (!old))
941 inet6_netconf_notify_devconf(net,
943 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
944 NETCONFA_IFINDEX_DEFAULT,
945 net->ipv6.devconf_dflt);
950 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
951 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
952 addrconf_linkdown_change(net, newf);
953 if ((!newf) ^ (!old))
954 inet6_netconf_notify_devconf(net,
956 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
957 NETCONFA_IFINDEX_ALL,
958 net->ipv6.devconf_all);
967 /* Nobody refers to this ifaddr, destroy it */
968 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
970 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
972 #ifdef NET_REFCNT_DEBUG
973 pr_debug("%s\n", __func__);
976 in6_dev_put(ifp->idev);
978 if (cancel_delayed_work(&ifp->dad_work))
979 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
982 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
983 pr_warn("Freeing alive inet6 address %p\n", ifp);
991 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
994 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
997 * Each device address list is sorted in order of scope -
998 * global before linklocal.
1000 list_for_each(p, &idev->addr_list) {
1001 struct inet6_ifaddr *ifa
1002 = list_entry(p, struct inet6_ifaddr, if_list);
1003 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
1007 list_add_tail_rcu(&ifp->if_list, p);
1010 static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr)
1012 u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net);
1014 return hash_32(val, IN6_ADDR_HSIZE_SHIFT);
1017 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1018 struct net_device *dev, unsigned int hash)
1020 struct inet6_ifaddr *ifp;
1022 hlist_for_each_entry(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
1023 if (ipv6_addr_equal(&ifp->addr, addr)) {
1024 if (!dev || ifp->idev->dev == dev)
1031 static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa)
1033 struct net *net = dev_net(dev);
1034 unsigned int hash = inet6_addr_hash(net, &ifa->addr);
1037 spin_lock(&net->ipv6.addrconf_hash_lock);
1039 /* Ignore adding duplicate addresses on an interface */
1040 if (ipv6_chk_same_addr(net, &ifa->addr, dev, hash)) {
1041 netdev_dbg(dev, "ipv6_add_addr: already assigned\n");
1044 hlist_add_head_rcu(&ifa->addr_lst, &net->ipv6.inet6_addr_lst[hash]);
1047 spin_unlock(&net->ipv6.addrconf_hash_lock);
1052 /* On success it returns ifp with increased reference count */
1054 static struct inet6_ifaddr *
1055 ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg,
1056 bool can_block, struct netlink_ext_ack *extack)
1058 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC;
1059 int addr_type = ipv6_addr_type(cfg->pfx);
1060 struct net *net = dev_net(idev->dev);
1061 struct inet6_ifaddr *ifa = NULL;
1062 struct fib6_info *f6i = NULL;
1065 if (addr_type == IPV6_ADDR_ANY ||
1066 (addr_type & IPV6_ADDR_MULTICAST &&
1067 !(cfg->ifa_flags & IFA_F_MCAUTOJOIN)) ||
1068 (!(idev->dev->flags & IFF_LOOPBACK) &&
1069 !netif_is_l3_master(idev->dev) &&
1070 addr_type & IPV6_ADDR_LOOPBACK))
1071 return ERR_PTR(-EADDRNOTAVAIL);
1074 err = -ENODEV; /*XXX*/
1078 if (idev->cnf.disable_ipv6) {
1083 /* validator notifier needs to be blocking;
1084 * do not call in atomic context
1087 struct in6_validator_info i6vi = {
1088 .i6vi_addr = *cfg->pfx,
1093 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi);
1094 err = notifier_to_errno(err);
1099 ifa = kzalloc(sizeof(*ifa), gfp_flags | __GFP_ACCOUNT);
1105 f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags);
1112 if (net->ipv6.devconf_all->disable_policy ||
1113 idev->cnf.disable_policy)
1114 f6i->dst_nopolicy = true;
1116 neigh_parms_data_state_setall(idev->nd_parms);
1118 ifa->addr = *cfg->pfx;
1120 ifa->peer_addr = *cfg->peer_pfx;
1122 spin_lock_init(&ifa->lock);
1123 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
1124 INIT_HLIST_NODE(&ifa->addr_lst);
1125 ifa->scope = cfg->scope;
1126 ifa->prefix_len = cfg->plen;
1127 ifa->rt_priority = cfg->rt_priority;
1128 ifa->flags = cfg->ifa_flags;
1129 ifa->ifa_proto = cfg->ifa_proto;
1130 /* No need to add the TENTATIVE flag for addresses with NODAD */
1131 if (!(cfg->ifa_flags & IFA_F_NODAD))
1132 ifa->flags |= IFA_F_TENTATIVE;
1133 ifa->valid_lft = cfg->valid_lft;
1134 ifa->prefered_lft = cfg->preferred_lft;
1135 ifa->cstamp = ifa->tstamp = jiffies;
1136 ifa->tokenized = false;
1144 refcount_set(&ifa->refcnt, 1);
1148 err = ipv6_add_addr_hash(idev->dev, ifa);
1150 rcu_read_unlock_bh();
1154 write_lock(&idev->lock);
1156 /* Add to inet6_dev unicast addr list. */
1157 ipv6_link_dev_addr(idev, ifa);
1159 if (ifa->flags&IFA_F_TEMPORARY) {
1160 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1165 write_unlock(&idev->lock);
1167 rcu_read_unlock_bh();
1169 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1171 if (unlikely(err < 0)) {
1172 fib6_info_release(f6i);
1176 in6_dev_put(ifa->idev);
1185 enum cleanup_prefix_rt_t {
1186 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1187 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1188 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1192 * Check, whether the prefix for ifp would still need a prefix route
1193 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1196 * 1) we don't purge prefix if address was not permanent.
1197 * prefix is managed by its own lifetime.
1198 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1199 * 3) if there are no addresses, delete prefix.
1200 * 4) if there are still other permanent address(es),
1201 * corresponding prefix is still permanent.
1202 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1203 * don't purge the prefix, assume user space is managing it.
1204 * 6) otherwise, update prefix lifetime to the
1205 * longest valid lifetime among the corresponding
1206 * addresses on the device.
1207 * Note: subsequent RA will update lifetime.
1209 static enum cleanup_prefix_rt_t
1210 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1212 struct inet6_ifaddr *ifa;
1213 struct inet6_dev *idev = ifp->idev;
1214 unsigned long lifetime;
1215 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1219 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1222 if (ifa->prefix_len != ifp->prefix_len ||
1223 !ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1226 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1227 return CLEANUP_PREFIX_RT_NOP;
1229 action = CLEANUP_PREFIX_RT_EXPIRE;
1231 spin_lock(&ifa->lock);
1233 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1235 * Note: Because this address is
1236 * not permanent, lifetime <
1237 * LONG_MAX / HZ here.
1239 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1240 *expires = ifa->tstamp + lifetime * HZ;
1241 spin_unlock(&ifa->lock);
1248 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires,
1249 bool del_rt, bool del_peer)
1251 struct fib6_info *f6i;
1253 f6i = addrconf_get_prefix_route(del_peer ? &ifp->peer_addr : &ifp->addr,
1255 ifp->idev->dev, 0, RTF_DEFAULT, true);
1258 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false);
1260 if (!(f6i->fib6_flags & RTF_EXPIRES))
1261 fib6_set_expires(f6i, expires);
1262 fib6_info_release(f6i);
1268 /* This function wants to get referenced ifp and releases it before return */
1270 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1272 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1273 struct net *net = dev_net(ifp->idev->dev);
1274 unsigned long expires;
1279 spin_lock_bh(&ifp->lock);
1281 ifp->state = INET6_IFADDR_STATE_DEAD;
1282 spin_unlock_bh(&ifp->lock);
1284 if (state == INET6_IFADDR_STATE_DEAD)
1287 spin_lock_bh(&net->ipv6.addrconf_hash_lock);
1288 hlist_del_init_rcu(&ifp->addr_lst);
1289 spin_unlock_bh(&net->ipv6.addrconf_hash_lock);
1291 write_lock_bh(&ifp->idev->lock);
1293 if (ifp->flags&IFA_F_TEMPORARY) {
1294 list_del(&ifp->tmp_list);
1296 in6_ifa_put(ifp->ifpub);
1302 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1303 action = check_cleanup_prefix_route(ifp, &expires);
1305 list_del_rcu(&ifp->if_list);
1308 write_unlock_bh(&ifp->idev->lock);
1310 addrconf_del_dad_work(ifp);
1312 ipv6_ifa_notify(RTM_DELADDR, ifp);
1314 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1316 if (action != CLEANUP_PREFIX_RT_NOP) {
1317 cleanup_prefix_route(ifp, expires,
1318 action == CLEANUP_PREFIX_RT_DEL, false);
1321 /* clean up prefsrc entries */
1322 rt6_remove_prefsrc(ifp);
1327 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, bool block)
1329 struct inet6_dev *idev = ifp->idev;
1330 unsigned long tmp_tstamp, age;
1331 unsigned long regen_advance;
1332 unsigned long now = jiffies;
1333 s32 cnf_temp_preferred_lft;
1334 struct inet6_ifaddr *ift;
1335 struct ifa6_config cfg;
1336 long max_desync_factor;
1337 struct in6_addr addr;
1340 write_lock_bh(&idev->lock);
1344 if (idev->cnf.use_tempaddr <= 0) {
1345 write_unlock_bh(&idev->lock);
1346 pr_info("%s: use_tempaddr is disabled\n", __func__);
1351 spin_lock_bh(&ifp->lock);
1352 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1353 idev->cnf.use_tempaddr = -1; /*XXX*/
1354 spin_unlock_bh(&ifp->lock);
1355 write_unlock_bh(&idev->lock);
1356 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1363 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1364 ipv6_gen_rnd_iid(&addr);
1366 age = (now - ifp->tstamp) / HZ;
1368 regen_advance = idev->cnf.regen_max_retry *
1369 idev->cnf.dad_transmits *
1370 max(NEIGH_VAR(idev->nd_parms, RETRANS_TIME), HZ/100) / HZ;
1372 /* recalculate max_desync_factor each time and update
1373 * idev->desync_factor if it's larger
1375 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
1376 max_desync_factor = min_t(__u32,
1377 idev->cnf.max_desync_factor,
1378 cnf_temp_preferred_lft - regen_advance);
1380 if (unlikely(idev->desync_factor > max_desync_factor)) {
1381 if (max_desync_factor > 0) {
1382 get_random_bytes(&idev->desync_factor,
1383 sizeof(idev->desync_factor));
1384 idev->desync_factor %= max_desync_factor;
1386 idev->desync_factor = 0;
1390 memset(&cfg, 0, sizeof(cfg));
1391 cfg.valid_lft = min_t(__u32, ifp->valid_lft,
1392 idev->cnf.temp_valid_lft + age);
1393 cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor;
1394 cfg.preferred_lft = min_t(__u32, ifp->prefered_lft, cfg.preferred_lft);
1396 cfg.plen = ifp->prefix_len;
1397 tmp_tstamp = ifp->tstamp;
1398 spin_unlock_bh(&ifp->lock);
1400 write_unlock_bh(&idev->lock);
1402 /* A temporary address is created only if this calculated Preferred
1403 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1404 * an implementation must not create a temporary address with a zero
1405 * Preferred Lifetime.
1406 * Use age calculation as in addrconf_verify to avoid unnecessary
1407 * temporary addresses being generated.
1409 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1410 if (cfg.preferred_lft <= regen_advance + age) {
1417 cfg.ifa_flags = IFA_F_TEMPORARY;
1418 /* set in addrconf_prefix_rcv() */
1419 if (ifp->flags & IFA_F_OPTIMISTIC)
1420 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
1423 cfg.scope = ipv6_addr_scope(cfg.pfx);
1425 ift = ipv6_add_addr(idev, &cfg, block, NULL);
1429 pr_info("%s: retry temporary address regeneration\n", __func__);
1430 write_lock_bh(&idev->lock);
1434 spin_lock_bh(&ift->lock);
1437 ift->tstamp = tmp_tstamp;
1438 spin_unlock_bh(&ift->lock);
1440 addrconf_dad_start(ift);
1448 * Choose an appropriate source address (RFC3484)
1451 IPV6_SADDR_RULE_INIT = 0,
1452 IPV6_SADDR_RULE_LOCAL,
1453 IPV6_SADDR_RULE_SCOPE,
1454 IPV6_SADDR_RULE_PREFERRED,
1455 #ifdef CONFIG_IPV6_MIP6
1456 IPV6_SADDR_RULE_HOA,
1458 IPV6_SADDR_RULE_OIF,
1459 IPV6_SADDR_RULE_LABEL,
1460 IPV6_SADDR_RULE_PRIVACY,
1461 IPV6_SADDR_RULE_ORCHID,
1462 IPV6_SADDR_RULE_PREFIX,
1463 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1464 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1469 struct ipv6_saddr_score {
1472 struct inet6_ifaddr *ifa;
1473 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1478 struct ipv6_saddr_dst {
1479 const struct in6_addr *addr;
1486 static inline int ipv6_saddr_preferred(int type)
1488 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1493 static bool ipv6_use_optimistic_addr(struct net *net,
1494 struct inet6_dev *idev)
1496 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1499 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1501 if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic)
1510 static bool ipv6_allow_optimistic_dad(struct net *net,
1511 struct inet6_dev *idev)
1513 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1516 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1525 static int ipv6_get_saddr_eval(struct net *net,
1526 struct ipv6_saddr_score *score,
1527 struct ipv6_saddr_dst *dst,
1532 if (i <= score->rule) {
1534 case IPV6_SADDR_RULE_SCOPE:
1535 ret = score->scopedist;
1537 case IPV6_SADDR_RULE_PREFIX:
1538 ret = score->matchlen;
1541 ret = !!test_bit(i, score->scorebits);
1547 case IPV6_SADDR_RULE_INIT:
1548 /* Rule 0: remember if hiscore is not ready yet */
1551 case IPV6_SADDR_RULE_LOCAL:
1552 /* Rule 1: Prefer same address */
1553 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1555 case IPV6_SADDR_RULE_SCOPE:
1556 /* Rule 2: Prefer appropriate scope
1561 * ---+--+-+---> scope
1563 * | d is scope of the destination.
1565 * | \ <- smaller scope is better if
1566 * B-15 | \ if scope is enough for destination.
1567 * | ret = B - scope (-1 <= scope >= d <= 15).
1569 * |/ <- greater is better
1570 * -C / if scope is not enough for destination.
1571 * /| ret = scope - C (-1 <= d < scope <= 15).
1573 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1574 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1575 * Assume B = 0 and we get C > 29.
1577 ret = __ipv6_addr_src_scope(score->addr_type);
1578 if (ret >= dst->scope)
1581 ret -= 128; /* 30 is enough */
1582 score->scopedist = ret;
1584 case IPV6_SADDR_RULE_PREFERRED:
1586 /* Rule 3: Avoid deprecated and optimistic addresses */
1587 u8 avoid = IFA_F_DEPRECATED;
1589 if (!ipv6_use_optimistic_addr(net, score->ifa->idev))
1590 avoid |= IFA_F_OPTIMISTIC;
1591 ret = ipv6_saddr_preferred(score->addr_type) ||
1592 !(score->ifa->flags & avoid);
1595 #ifdef CONFIG_IPV6_MIP6
1596 case IPV6_SADDR_RULE_HOA:
1598 /* Rule 4: Prefer home address */
1599 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1600 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1604 case IPV6_SADDR_RULE_OIF:
1605 /* Rule 5: Prefer outgoing interface */
1606 ret = (!dst->ifindex ||
1607 dst->ifindex == score->ifa->idev->dev->ifindex);
1609 case IPV6_SADDR_RULE_LABEL:
1610 /* Rule 6: Prefer matching label */
1611 ret = ipv6_addr_label(net,
1612 &score->ifa->addr, score->addr_type,
1613 score->ifa->idev->dev->ifindex) == dst->label;
1615 case IPV6_SADDR_RULE_PRIVACY:
1617 /* Rule 7: Prefer public address
1618 * Note: prefer temporary address if use_tempaddr >= 2
1620 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1621 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1622 score->ifa->idev->cnf.use_tempaddr >= 2;
1623 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1626 case IPV6_SADDR_RULE_ORCHID:
1627 /* Rule 8-: Prefer ORCHID vs ORCHID or
1628 * non-ORCHID vs non-ORCHID
1630 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1631 ipv6_addr_orchid(dst->addr));
1633 case IPV6_SADDR_RULE_PREFIX:
1634 /* Rule 8: Use longest matching prefix */
1635 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1636 if (ret > score->ifa->prefix_len)
1637 ret = score->ifa->prefix_len;
1638 score->matchlen = ret;
1640 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1641 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1642 /* Optimistic addresses still have lower precedence than other
1643 * preferred addresses.
1645 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1653 __set_bit(i, score->scorebits);
1659 static int __ipv6_dev_get_saddr(struct net *net,
1660 struct ipv6_saddr_dst *dst,
1661 struct inet6_dev *idev,
1662 struct ipv6_saddr_score *scores,
1665 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1667 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) {
1671 * - Tentative Address (RFC2462 section 5.4)
1672 * - A tentative address is not considered
1673 * "assigned to an interface" in the traditional
1674 * sense, unless it is also flagged as optimistic.
1675 * - Candidate Source Address (section 4)
1676 * - In any case, anycast addresses, multicast
1677 * addresses, and the unspecified address MUST
1678 * NOT be included in a candidate set.
1680 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1681 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1684 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1686 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1687 score->addr_type & IPV6_ADDR_MULTICAST)) {
1688 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1694 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1696 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1697 int minihiscore, miniscore;
1699 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1700 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1702 if (minihiscore > miniscore) {
1703 if (i == IPV6_SADDR_RULE_SCOPE &&
1704 score->scopedist > 0) {
1707 * each remaining entry
1708 * has too small (not enough)
1709 * scope, because ifa entries
1710 * are sorted by their scope
1716 } else if (minihiscore < miniscore) {
1717 swap(hiscore, score);
1718 hiscore_idx = 1 - hiscore_idx;
1720 /* restore our iterator */
1721 score->ifa = hiscore->ifa;
1731 static int ipv6_get_saddr_master(struct net *net,
1732 const struct net_device *dst_dev,
1733 const struct net_device *master,
1734 struct ipv6_saddr_dst *dst,
1735 struct ipv6_saddr_score *scores,
1738 struct inet6_dev *idev;
1740 idev = __in6_dev_get(dst_dev);
1742 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1743 scores, hiscore_idx);
1745 idev = __in6_dev_get(master);
1747 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1748 scores, hiscore_idx);
1753 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1754 const struct in6_addr *daddr, unsigned int prefs,
1755 struct in6_addr *saddr)
1757 struct ipv6_saddr_score scores[2], *hiscore;
1758 struct ipv6_saddr_dst dst;
1759 struct inet6_dev *idev;
1760 struct net_device *dev;
1762 bool use_oif_addr = false;
1763 int hiscore_idx = 0;
1766 dst_type = __ipv6_addr_type(daddr);
1768 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1769 dst.scope = __ipv6_addr_src_scope(dst_type);
1770 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1773 scores[hiscore_idx].rule = -1;
1774 scores[hiscore_idx].ifa = NULL;
1778 /* Candidate Source Address (section 4)
1779 * - multicast and link-local destination address,
1780 * the set of candidate source address MUST only
1781 * include addresses assigned to interfaces
1782 * belonging to the same link as the outgoing
1784 * (- For site-local destination addresses, the
1785 * set of candidate source addresses MUST only
1786 * include addresses assigned to interfaces
1787 * belonging to the same site as the outgoing
1789 * - "It is RECOMMENDED that the candidate source addresses
1790 * be the set of unicast addresses assigned to the
1791 * interface that will be used to send to the destination
1792 * (the 'outgoing' interface)." (RFC 6724)
1795 idev = __in6_dev_get(dst_dev);
1796 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1797 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1798 (idev && idev->cnf.use_oif_addrs_only)) {
1799 use_oif_addr = true;
1805 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1807 const struct net_device *master;
1810 /* if dst_dev exists and is enslaved to an L3 device, then
1811 * prefer addresses from dst_dev and then the master over
1812 * any other enslaved devices in the L3 domain.
1814 master = l3mdev_master_dev_rcu(dst_dev);
1816 master_idx = master->ifindex;
1818 hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1820 scores, hiscore_idx);
1822 if (scores[hiscore_idx].ifa)
1826 for_each_netdev_rcu(net, dev) {
1827 /* only consider addresses on devices in the
1830 if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1832 idev = __in6_dev_get(dev);
1835 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1840 hiscore = &scores[hiscore_idx];
1842 ret = -EADDRNOTAVAIL;
1844 *saddr = hiscore->ifa->addr;
1849 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1851 static int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1854 struct inet6_ifaddr *ifp;
1855 int err = -EADDRNOTAVAIL;
1857 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1858 if (ifp->scope > IFA_LINK)
1860 if (ifp->scope == IFA_LINK &&
1861 !(ifp->flags & banned_flags)) {
1870 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1873 struct inet6_dev *idev;
1874 int err = -EADDRNOTAVAIL;
1877 idev = __in6_dev_get(dev);
1879 read_lock_bh(&idev->lock);
1880 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1881 read_unlock_bh(&idev->lock);
1887 static int ipv6_count_addresses(const struct inet6_dev *idev)
1889 const struct inet6_ifaddr *ifp;
1893 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list)
1899 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1900 const struct net_device *dev, int strict)
1902 return ipv6_chk_addr_and_flags(net, addr, dev, !dev,
1903 strict, IFA_F_TENTATIVE);
1905 EXPORT_SYMBOL(ipv6_chk_addr);
1907 /* device argument is used to find the L3 domain of interest. If
1908 * skip_dev_check is set, then the ifp device is not checked against
1909 * the passed in dev argument. So the 2 cases for addresses checks are:
1910 * 1. does the address exist in the L3 domain that dev is part of
1911 * (skip_dev_check = true), or
1913 * 2. does the address exist on the specific device
1914 * (skip_dev_check = false)
1916 static struct net_device *
1917 __ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1918 const struct net_device *dev, bool skip_dev_check,
1919 int strict, u32 banned_flags)
1921 unsigned int hash = inet6_addr_hash(net, addr);
1922 struct net_device *l3mdev, *ndev;
1923 struct inet6_ifaddr *ifp;
1928 l3mdev = l3mdev_master_dev_rcu(dev);
1932 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
1933 ndev = ifp->idev->dev;
1935 if (l3mdev_master_dev_rcu(ndev) != l3mdev)
1938 /* Decouple optimistic from tentative for evaluation here.
1939 * Ban optimistic addresses explicitly, when required.
1941 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1942 ? (ifp->flags&~IFA_F_TENTATIVE)
1944 if (ipv6_addr_equal(&ifp->addr, addr) &&
1945 !(ifp_flags&banned_flags) &&
1946 (!dev || ndev == dev ||
1947 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1957 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1958 const struct net_device *dev, bool skip_dev_check,
1959 int strict, u32 banned_flags)
1961 return __ipv6_chk_addr_and_flags(net, addr, dev, skip_dev_check,
1962 strict, banned_flags) ? 1 : 0;
1964 EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1967 /* Compares an address/prefix_len with addresses on device @dev.
1968 * If one is found it returns true.
1970 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1971 const unsigned int prefix_len, struct net_device *dev)
1973 const struct inet6_ifaddr *ifa;
1974 const struct inet6_dev *idev;
1978 idev = __in6_dev_get(dev);
1980 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
1981 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1990 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1992 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1994 const struct inet6_ifaddr *ifa;
1995 const struct inet6_dev *idev;
2000 idev = __in6_dev_get(dev);
2002 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
2003 onlink = ipv6_prefix_equal(addr, &ifa->addr,
2012 EXPORT_SYMBOL(ipv6_chk_prefix);
2015 * ipv6_dev_find - find the first device with a given source address.
2016 * @net: the net namespace
2017 * @addr: the source address
2018 * @dev: used to find the L3 domain of interest
2020 * The caller should be protected by RCU, or RTNL.
2022 struct net_device *ipv6_dev_find(struct net *net, const struct in6_addr *addr,
2023 struct net_device *dev)
2025 return __ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1,
2028 EXPORT_SYMBOL(ipv6_dev_find);
2030 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
2031 struct net_device *dev, int strict)
2033 unsigned int hash = inet6_addr_hash(net, addr);
2034 struct inet6_ifaddr *ifp, *result = NULL;
2037 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
2038 if (ipv6_addr_equal(&ifp->addr, addr)) {
2039 if (!dev || ifp->idev->dev == dev ||
2040 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
2052 /* Gets referenced address, destroys ifaddr */
2054 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
2057 ifp->flags |= IFA_F_DADFAILED;
2059 if (ifp->flags&IFA_F_TEMPORARY) {
2060 struct inet6_ifaddr *ifpub;
2061 spin_lock_bh(&ifp->lock);
2064 in6_ifa_hold(ifpub);
2065 spin_unlock_bh(&ifp->lock);
2066 ipv6_create_tempaddr(ifpub, true);
2069 spin_unlock_bh(&ifp->lock);
2072 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) {
2073 spin_lock_bh(&ifp->lock);
2074 addrconf_del_dad_work(ifp);
2075 ifp->flags |= IFA_F_TENTATIVE;
2077 ifp->flags &= ~IFA_F_OPTIMISTIC;
2078 spin_unlock_bh(&ifp->lock);
2080 ipv6_ifa_notify(0, ifp);
2087 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
2091 spin_lock_bh(&ifp->lock);
2092 if (ifp->state == INET6_IFADDR_STATE_DAD) {
2093 ifp->state = INET6_IFADDR_STATE_POSTDAD;
2096 spin_unlock_bh(&ifp->lock);
2101 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp)
2103 struct inet6_dev *idev = ifp->idev;
2104 struct net *net = dev_net(idev->dev);
2106 if (addrconf_dad_end(ifp)) {
2111 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n",
2112 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source);
2114 spin_lock_bh(&ifp->lock);
2116 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
2117 struct in6_addr new_addr;
2118 struct inet6_ifaddr *ifp2;
2119 int retries = ifp->stable_privacy_retry + 1;
2120 struct ifa6_config cfg = {
2122 .plen = ifp->prefix_len,
2123 .ifa_flags = ifp->flags,
2124 .valid_lft = ifp->valid_lft,
2125 .preferred_lft = ifp->prefered_lft,
2126 .scope = ifp->scope,
2129 if (retries > net->ipv6.sysctl.idgen_retries) {
2130 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
2131 ifp->idev->dev->name);
2135 new_addr = ifp->addr;
2136 if (ipv6_generate_stable_address(&new_addr, retries,
2140 spin_unlock_bh(&ifp->lock);
2142 if (idev->cnf.max_addresses &&
2143 ipv6_count_addresses(idev) >=
2144 idev->cnf.max_addresses)
2147 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
2148 ifp->idev->dev->name);
2150 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL);
2154 spin_lock_bh(&ifp2->lock);
2155 ifp2->stable_privacy_retry = retries;
2156 ifp2->state = INET6_IFADDR_STATE_PREDAD;
2157 spin_unlock_bh(&ifp2->lock);
2159 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
2162 spin_lock_bh(&ifp->lock);
2166 /* transition from _POSTDAD to _ERRDAD */
2167 ifp->state = INET6_IFADDR_STATE_ERRDAD;
2168 spin_unlock_bh(&ifp->lock);
2170 addrconf_mod_dad_work(ifp, 0);
2174 /* Join to solicited addr multicast group.
2175 * caller must hold RTNL */
2176 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
2178 struct in6_addr maddr;
2180 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2183 addrconf_addr_solict_mult(addr, &maddr);
2184 ipv6_dev_mc_inc(dev, &maddr);
2187 /* caller must hold RTNL */
2188 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
2190 struct in6_addr maddr;
2192 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2195 addrconf_addr_solict_mult(addr, &maddr);
2196 __ipv6_dev_mc_dec(idev, &maddr);
2199 /* caller must hold RTNL */
2200 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
2202 struct in6_addr addr;
2204 if (ifp->prefix_len >= 127) /* RFC 6164 */
2206 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2207 if (ipv6_addr_any(&addr))
2209 __ipv6_dev_ac_inc(ifp->idev, &addr);
2212 /* caller must hold RTNL */
2213 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
2215 struct in6_addr addr;
2217 if (ifp->prefix_len >= 127) /* RFC 6164 */
2219 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2220 if (ipv6_addr_any(&addr))
2222 __ipv6_dev_ac_dec(ifp->idev, &addr);
2225 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev)
2227 switch (dev->addr_len) {
2229 memcpy(eui, dev->dev_addr, 3);
2232 memcpy(eui + 5, dev->dev_addr + 3, 3);
2234 case EUI64_ADDR_LEN:
2235 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2245 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2247 const union fwnet_hwaddr *ha;
2249 if (dev->addr_len != FWNET_ALEN)
2252 ha = (const union fwnet_hwaddr *)dev->dev_addr;
2254 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2259 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2261 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2262 if (dev->addr_len != ARCNET_ALEN)
2265 eui[7] = *(u8 *)dev->dev_addr;
2269 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2271 if (dev->addr_len != INFINIBAND_ALEN)
2273 memcpy(eui, dev->dev_addr + 12, 8);
2278 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
2282 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2283 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2284 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2285 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2286 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2287 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2291 memcpy(eui + 4, &addr, 4);
2295 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2297 if (dev->priv_flags & IFF_ISATAP)
2298 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2302 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2304 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2307 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2309 memcpy(eui, dev->perm_addr, 3);
2310 memcpy(eui + 5, dev->perm_addr + 3, 3);
2317 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2319 switch (dev->type) {
2322 return addrconf_ifid_eui48(eui, dev);
2324 return addrconf_ifid_arcnet(eui, dev);
2325 case ARPHRD_INFINIBAND:
2326 return addrconf_ifid_infiniband(eui, dev);
2328 return addrconf_ifid_sit(eui, dev);
2331 return addrconf_ifid_gre(eui, dev);
2332 case ARPHRD_6LOWPAN:
2333 return addrconf_ifid_6lowpan(eui, dev);
2334 case ARPHRD_IEEE1394:
2335 return addrconf_ifid_ieee1394(eui, dev);
2336 case ARPHRD_TUNNEL6:
2339 return addrconf_ifid_ip6tnl(eui, dev);
2344 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2347 struct inet6_ifaddr *ifp;
2349 read_lock_bh(&idev->lock);
2350 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2351 if (ifp->scope > IFA_LINK)
2353 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2354 memcpy(eui, ifp->addr.s6_addr+8, 8);
2359 read_unlock_bh(&idev->lock);
2363 /* Generation of a randomized Interface Identifier
2364 * draft-ietf-6man-rfc4941bis, Section 3.3.1
2367 static void ipv6_gen_rnd_iid(struct in6_addr *addr)
2370 get_random_bytes(&addr->s6_addr[8], 8);
2372 /* <draft-ietf-6man-rfc4941bis-08.txt>, Section 3.3.1:
2373 * check if generated address is not inappropriate:
2375 * - Reserved IPv6 Interface Identifiers
2376 * - XXX: already assigned to an address on the device
2379 /* Subnet-router anycast: 0000:0000:0000:0000 */
2380 if (!(addr->s6_addr32[2] | addr->s6_addr32[3]))
2383 /* IANA Ethernet block: 0200:5EFF:FE00:0000-0200:5EFF:FE00:5212
2384 * Proxy Mobile IPv6: 0200:5EFF:FE00:5213
2385 * IANA Ethernet block: 0200:5EFF:FE00:5214-0200:5EFF:FEFF:FFFF
2387 if (ntohl(addr->s6_addr32[2]) == 0x02005eff &&
2388 (ntohl(addr->s6_addr32[3]) & 0Xff000000) == 0xfe000000)
2391 /* Reserved subnet anycast addresses */
2392 if (ntohl(addr->s6_addr32[2]) == 0xfdffffff &&
2393 ntohl(addr->s6_addr32[3]) >= 0Xffffff80)
2402 addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric,
2403 struct net_device *dev, unsigned long expires,
2404 u32 flags, gfp_t gfp_flags)
2406 struct fib6_config cfg = {
2407 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
2408 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF,
2409 .fc_ifindex = dev->ifindex,
2410 .fc_expires = expires,
2412 .fc_flags = RTF_UP | flags,
2413 .fc_nlinfo.nl_net = dev_net(dev),
2414 .fc_protocol = RTPROT_KERNEL,
2415 .fc_type = RTN_UNICAST,
2420 /* Prevent useless cloning on PtP SIT.
2421 This thing is done here expecting that the whole
2422 class of non-broadcast devices need not cloning.
2424 #if IS_ENABLED(CONFIG_IPV6_SIT)
2425 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2426 cfg.fc_flags |= RTF_NONEXTHOP;
2429 ip6_route_add(&cfg, gfp_flags, NULL);
2433 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2435 const struct net_device *dev,
2436 u32 flags, u32 noflags,
2439 struct fib6_node *fn;
2440 struct fib6_info *rt = NULL;
2441 struct fib6_table *table;
2442 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
2444 table = fib6_get_table(dev_net(dev), tb_id);
2449 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true);
2453 for_each_fib6_node_rt_rcu(fn) {
2454 /* prefix routes only use builtin fib6_nh */
2458 if (rt->fib6_nh->fib_nh_dev->ifindex != dev->ifindex)
2460 if (no_gw && rt->fib6_nh->fib_nh_gw_family)
2462 if ((rt->fib6_flags & flags) != flags)
2464 if ((rt->fib6_flags & noflags) != 0)
2466 if (!fib6_info_hold_safe(rt))
2476 /* Create "default" multicast route to the interface */
2478 static void addrconf_add_mroute(struct net_device *dev)
2480 struct fib6_config cfg = {
2481 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2482 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2483 .fc_ifindex = dev->ifindex,
2486 .fc_type = RTN_MULTICAST,
2487 .fc_nlinfo.nl_net = dev_net(dev),
2488 .fc_protocol = RTPROT_KERNEL,
2491 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2493 ip6_route_add(&cfg, GFP_KERNEL, NULL);
2496 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2498 struct inet6_dev *idev;
2502 idev = ipv6_find_idev(dev);
2506 if (idev->cnf.disable_ipv6)
2507 return ERR_PTR(-EACCES);
2509 /* Add default multicast route */
2510 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
2511 addrconf_add_mroute(dev);
2516 static void manage_tempaddrs(struct inet6_dev *idev,
2517 struct inet6_ifaddr *ifp,
2518 __u32 valid_lft, __u32 prefered_lft,
2519 bool create, unsigned long now)
2522 struct inet6_ifaddr *ift;
2524 read_lock_bh(&idev->lock);
2525 /* update all temporary addresses in the list */
2526 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2527 int age, max_valid, max_prefered;
2529 if (ifp != ift->ifpub)
2532 /* RFC 4941 section 3.3:
2533 * If a received option will extend the lifetime of a public
2534 * address, the lifetimes of temporary addresses should
2535 * be extended, subject to the overall constraint that no
2536 * temporary addresses should ever remain "valid" or "preferred"
2537 * for a time longer than (TEMP_VALID_LIFETIME) or
2538 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2540 age = (now - ift->cstamp) / HZ;
2541 max_valid = idev->cnf.temp_valid_lft - age;
2545 max_prefered = idev->cnf.temp_prefered_lft -
2546 idev->desync_factor - age;
2547 if (max_prefered < 0)
2550 if (valid_lft > max_valid)
2551 valid_lft = max_valid;
2553 if (prefered_lft > max_prefered)
2554 prefered_lft = max_prefered;
2556 spin_lock(&ift->lock);
2558 ift->valid_lft = valid_lft;
2559 ift->prefered_lft = prefered_lft;
2561 if (prefered_lft > 0)
2562 ift->flags &= ~IFA_F_DEPRECATED;
2564 spin_unlock(&ift->lock);
2565 if (!(flags&IFA_F_TENTATIVE))
2566 ipv6_ifa_notify(0, ift);
2569 if ((create || list_empty(&idev->tempaddr_list)) &&
2570 idev->cnf.use_tempaddr > 0) {
2571 /* When a new public address is created as described
2572 * in [ADDRCONF], also create a new temporary address.
2573 * Also create a temporary address if it's enabled but
2574 * no temporary address currently exists.
2576 read_unlock_bh(&idev->lock);
2577 ipv6_create_tempaddr(ifp, false);
2579 read_unlock_bh(&idev->lock);
2583 static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2585 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2586 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2589 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2590 const struct prefix_info *pinfo,
2591 struct inet6_dev *in6_dev,
2592 const struct in6_addr *addr, int addr_type,
2593 u32 addr_flags, bool sllao, bool tokenized,
2594 __u32 valid_lft, u32 prefered_lft)
2596 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2597 int create = 0, update_lft = 0;
2599 if (!ifp && valid_lft) {
2600 int max_addresses = in6_dev->cnf.max_addresses;
2601 struct ifa6_config cfg = {
2603 .plen = pinfo->prefix_len,
2604 .ifa_flags = addr_flags,
2605 .valid_lft = valid_lft,
2606 .preferred_lft = prefered_lft,
2607 .scope = addr_type & IPV6_ADDR_SCOPE_MASK,
2608 .ifa_proto = IFAPROT_KERNEL_RA
2611 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2612 if ((net->ipv6.devconf_all->optimistic_dad ||
2613 in6_dev->cnf.optimistic_dad) &&
2614 !net->ipv6.devconf_all->forwarding && sllao)
2615 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
2618 /* Do not allow to create too much of autoconfigured
2619 * addresses; this would be too easy way to crash kernel.
2621 if (!max_addresses ||
2622 ipv6_count_addresses(in6_dev) < max_addresses)
2623 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL);
2625 if (IS_ERR_OR_NULL(ifp))
2629 spin_lock_bh(&ifp->lock);
2630 ifp->flags |= IFA_F_MANAGETEMPADDR;
2631 ifp->cstamp = jiffies;
2632 ifp->tokenized = tokenized;
2633 spin_unlock_bh(&ifp->lock);
2634 addrconf_dad_start(ifp);
2642 /* update lifetime (RFC2462 5.5.3 e) */
2643 spin_lock_bh(&ifp->lock);
2645 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2646 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2649 if (!create && stored_lft) {
2650 const u32 minimum_lft = min_t(u32,
2651 stored_lft, MIN_VALID_LIFETIME);
2652 valid_lft = max(valid_lft, minimum_lft);
2654 /* RFC4862 Section 5.5.3e:
2655 * "Note that the preferred lifetime of the
2656 * corresponding address is always reset to
2657 * the Preferred Lifetime in the received
2658 * Prefix Information option, regardless of
2659 * whether the valid lifetime is also reset or
2662 * So we should always update prefered_lft here.
2668 ifp->valid_lft = valid_lft;
2669 ifp->prefered_lft = prefered_lft;
2672 ifp->flags &= ~IFA_F_DEPRECATED;
2673 spin_unlock_bh(&ifp->lock);
2675 if (!(flags&IFA_F_TENTATIVE))
2676 ipv6_ifa_notify(0, ifp);
2678 spin_unlock_bh(&ifp->lock);
2680 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2684 addrconf_verify(net);
2689 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
2691 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2693 struct prefix_info *pinfo;
2698 struct inet6_dev *in6_dev;
2699 struct net *net = dev_net(dev);
2701 pinfo = (struct prefix_info *) opt;
2703 if (len < sizeof(struct prefix_info)) {
2704 netdev_dbg(dev, "addrconf: prefix option too short\n");
2709 * Validation checks ([ADDRCONF], page 19)
2712 addr_type = ipv6_addr_type(&pinfo->prefix);
2714 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2717 valid_lft = ntohl(pinfo->valid);
2718 prefered_lft = ntohl(pinfo->prefered);
2720 if (prefered_lft > valid_lft) {
2721 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2725 in6_dev = in6_dev_get(dev);
2728 net_dbg_ratelimited("addrconf: device %s not configured\n",
2734 * Two things going on here:
2735 * 1) Add routes for on-link prefixes
2736 * 2) Configure prefixes with the auto flag set
2739 if (pinfo->onlink) {
2740 struct fib6_info *rt;
2741 unsigned long rt_expires;
2743 /* Avoid arithmetic overflow. Really, we could
2744 * save rt_expires in seconds, likely valid_lft,
2745 * but it would require division in fib gc, that it
2749 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2751 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2753 if (addrconf_finite_timeout(rt_expires))
2756 rt = addrconf_get_prefix_route(&pinfo->prefix,
2759 RTF_ADDRCONF | RTF_PREFIX_RT,
2763 /* Autoconf prefix route */
2764 if (valid_lft == 0) {
2765 ip6_del_rt(net, rt, false);
2767 } else if (addrconf_finite_timeout(rt_expires)) {
2769 fib6_set_expires(rt, jiffies + rt_expires);
2771 fib6_clean_expires(rt);
2773 } else if (valid_lft) {
2774 clock_t expires = 0;
2775 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2776 if (addrconf_finite_timeout(rt_expires)) {
2778 flags |= RTF_EXPIRES;
2779 expires = jiffies_to_clock_t(rt_expires);
2781 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2782 0, dev, expires, flags,
2785 fib6_info_release(rt);
2788 /* Try to figure out our local address for this prefix */
2790 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2791 struct in6_addr addr;
2792 bool tokenized = false, dev_addr_generated = false;
2794 if (pinfo->prefix_len == 64) {
2795 memcpy(&addr, &pinfo->prefix, 8);
2797 if (!ipv6_addr_any(&in6_dev->token)) {
2798 read_lock_bh(&in6_dev->lock);
2799 memcpy(addr.s6_addr + 8,
2800 in6_dev->token.s6_addr + 8, 8);
2801 read_unlock_bh(&in6_dev->lock);
2803 } else if (is_addr_mode_generate_stable(in6_dev) &&
2804 !ipv6_generate_stable_address(&addr, 0,
2806 addr_flags |= IFA_F_STABLE_PRIVACY;
2808 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2809 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2812 dev_addr_generated = true;
2816 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2821 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2824 tokenized, valid_lft,
2829 /* Ignore error case here because previous prefix add addr was
2830 * successful which will be notified.
2832 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2833 addr_type, addr_flags, sllao,
2834 tokenized, valid_lft,
2836 dev_addr_generated);
2838 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2840 in6_dev_put(in6_dev);
2843 static int addrconf_set_sit_dstaddr(struct net *net, struct net_device *dev,
2844 struct in6_ifreq *ireq)
2846 struct ip_tunnel_parm p = { };
2849 if (!(ipv6_addr_type(&ireq->ifr6_addr) & IPV6_ADDR_COMPATv4))
2850 return -EADDRNOTAVAIL;
2852 p.iph.daddr = ireq->ifr6_addr.s6_addr32[3];
2855 p.iph.protocol = IPPROTO_IPV6;
2858 if (!dev->netdev_ops->ndo_tunnel_ctl)
2860 err = dev->netdev_ops->ndo_tunnel_ctl(dev, &p, SIOCADDTUNNEL);
2864 dev = __dev_get_by_name(net, p.name);
2867 return dev_open(dev, NULL);
2871 * Set destination address.
2872 * Special case for SIT interfaces where we create a new "virtual"
2875 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2877 struct net_device *dev;
2878 struct in6_ifreq ireq;
2881 if (!IS_ENABLED(CONFIG_IPV6_SIT))
2883 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2887 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2888 if (dev && dev->type == ARPHRD_SIT)
2889 err = addrconf_set_sit_dstaddr(net, dev, &ireq);
2894 static int ipv6_mc_config(struct sock *sk, bool join,
2895 const struct in6_addr *addr, int ifindex)
2903 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2905 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2912 * Manual configuration of address on an interface
2914 static int inet6_addr_add(struct net *net, int ifindex,
2915 struct ifa6_config *cfg,
2916 struct netlink_ext_ack *extack)
2918 struct inet6_ifaddr *ifp;
2919 struct inet6_dev *idev;
2920 struct net_device *dev;
2921 unsigned long timeout;
2927 if (cfg->plen > 128)
2930 /* check the lifetime */
2931 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
2934 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64)
2937 dev = __dev_get_by_index(net, ifindex);
2941 idev = addrconf_add_dev(dev);
2943 return PTR_ERR(idev);
2945 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
2946 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2947 true, cfg->pfx, ifindex);
2953 cfg->scope = ipv6_addr_scope(cfg->pfx);
2955 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
2956 if (addrconf_finite_timeout(timeout)) {
2957 expires = jiffies_to_clock_t(timeout * HZ);
2958 cfg->valid_lft = timeout;
2959 flags = RTF_EXPIRES;
2963 cfg->ifa_flags |= IFA_F_PERMANENT;
2966 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
2967 if (addrconf_finite_timeout(timeout)) {
2969 cfg->ifa_flags |= IFA_F_DEPRECATED;
2970 cfg->preferred_lft = timeout;
2973 ifp = ipv6_add_addr(idev, cfg, true, extack);
2975 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
2976 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
2977 ifp->rt_priority, dev, expires,
2981 /* Send a netlink notification if DAD is enabled and
2982 * optimistic flag is not set
2984 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD)))
2985 ipv6_ifa_notify(0, ifp);
2987 * Note that section 3.1 of RFC 4429 indicates
2988 * that the Optimistic flag should not be set for
2989 * manually configured addresses
2991 addrconf_dad_start(ifp);
2992 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR)
2993 manage_tempaddrs(idev, ifp, cfg->valid_lft,
2994 cfg->preferred_lft, true, jiffies);
2996 addrconf_verify_rtnl(net);
2998 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
2999 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false,
3003 return PTR_ERR(ifp);
3006 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
3007 const struct in6_addr *pfx, unsigned int plen)
3009 struct inet6_ifaddr *ifp;
3010 struct inet6_dev *idev;
3011 struct net_device *dev;
3016 dev = __dev_get_by_index(net, ifindex);
3020 idev = __in6_dev_get(dev);
3024 read_lock_bh(&idev->lock);
3025 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3026 if (ifp->prefix_len == plen &&
3027 ipv6_addr_equal(pfx, &ifp->addr)) {
3029 read_unlock_bh(&idev->lock);
3031 if (!(ifp->flags & IFA_F_TEMPORARY) &&
3032 (ifa_flags & IFA_F_MANAGETEMPADDR))
3033 manage_tempaddrs(idev, ifp, 0, 0, false,
3036 addrconf_verify_rtnl(net);
3037 if (ipv6_addr_is_multicast(pfx)) {
3038 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
3039 false, pfx, dev->ifindex);
3044 read_unlock_bh(&idev->lock);
3045 return -EADDRNOTAVAIL;
3049 int addrconf_add_ifaddr(struct net *net, void __user *arg)
3051 struct ifa6_config cfg = {
3052 .ifa_flags = IFA_F_PERMANENT,
3053 .preferred_lft = INFINITY_LIFE_TIME,
3054 .valid_lft = INFINITY_LIFE_TIME,
3056 struct in6_ifreq ireq;
3059 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3062 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3065 cfg.pfx = &ireq.ifr6_addr;
3066 cfg.plen = ireq.ifr6_prefixlen;
3069 err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL);
3074 int addrconf_del_ifaddr(struct net *net, void __user *arg)
3076 struct in6_ifreq ireq;
3079 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3082 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3086 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
3087 ireq.ifr6_prefixlen);
3092 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
3093 int plen, int scope, u8 proto)
3095 struct inet6_ifaddr *ifp;
3096 struct ifa6_config cfg = {
3099 .ifa_flags = IFA_F_PERMANENT,
3100 .valid_lft = INFINITY_LIFE_TIME,
3101 .preferred_lft = INFINITY_LIFE_TIME,
3106 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
3108 spin_lock_bh(&ifp->lock);
3109 ifp->flags &= ~IFA_F_TENTATIVE;
3110 spin_unlock_bh(&ifp->lock);
3111 rt_genid_bump_ipv6(dev_net(idev->dev));
3112 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3117 #if IS_ENABLED(CONFIG_IPV6_SIT) || IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE)
3118 static void add_v4_addrs(struct inet6_dev *idev)
3120 struct in6_addr addr;
3121 struct net_device *dev;
3122 struct net *net = dev_net(idev->dev);
3123 int scope, plen, offset = 0;
3128 memset(&addr, 0, sizeof(struct in6_addr));
3129 /* in case of IP6GRE the dev_addr is an IPv6 and therefore we use only the last 4 bytes */
3130 if (idev->dev->addr_len == sizeof(struct in6_addr))
3131 offset = sizeof(struct in6_addr) - 4;
3132 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr + offset, 4);
3134 if (idev->dev->flags&IFF_POINTOPOINT) {
3135 if (idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_NONE)
3138 addr.s6_addr32[0] = htonl(0xfe800000);
3142 scope = IPV6_ADDR_COMPATv4;
3144 pflags |= RTF_NONEXTHOP;
3147 if (addr.s6_addr32[3]) {
3148 add_addr(idev, &addr, plen, scope, IFAPROT_UNSPEC);
3149 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags,
3154 for_each_netdev(net, dev) {
3155 struct in_device *in_dev = __in_dev_get_rtnl(dev);
3156 if (in_dev && (dev->flags & IFF_UP)) {
3157 struct in_ifaddr *ifa;
3160 in_dev_for_each_ifa_rtnl(ifa, in_dev) {
3161 addr.s6_addr32[3] = ifa->ifa_local;
3163 if (ifa->ifa_scope == RT_SCOPE_LINK)
3165 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
3166 if (idev->dev->flags&IFF_POINTOPOINT)
3171 add_addr(idev, &addr, plen, flag,
3173 addrconf_prefix_route(&addr, plen, 0, idev->dev,
3174 0, pflags, GFP_KERNEL);
3181 static void init_loopback(struct net_device *dev)
3183 struct inet6_dev *idev;
3189 idev = ipv6_find_idev(dev);
3191 pr_debug("%s: add_dev failed\n", __func__);
3195 add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFAPROT_KERNEL_LO);
3198 void addrconf_add_linklocal(struct inet6_dev *idev,
3199 const struct in6_addr *addr, u32 flags)
3201 struct ifa6_config cfg = {
3204 .ifa_flags = flags | IFA_F_PERMANENT,
3205 .valid_lft = INFINITY_LIFE_TIME,
3206 .preferred_lft = INFINITY_LIFE_TIME,
3208 .ifa_proto = IFAPROT_KERNEL_LL
3210 struct inet6_ifaddr *ifp;
3212 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3213 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad ||
3214 idev->cnf.optimistic_dad) &&
3215 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
3216 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
3219 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
3221 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev,
3223 addrconf_dad_start(ifp);
3227 EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
3229 static bool ipv6_reserved_interfaceid(struct in6_addr address)
3231 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3234 if (address.s6_addr32[2] == htonl(0x02005eff) &&
3235 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3238 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3239 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3245 static int ipv6_generate_stable_address(struct in6_addr *address,
3247 const struct inet6_dev *idev)
3249 static DEFINE_SPINLOCK(lock);
3250 static __u32 digest[SHA1_DIGEST_WORDS];
3251 static __u32 workspace[SHA1_WORKSPACE_WORDS];
3254 char __data[SHA1_BLOCK_SIZE];
3256 struct in6_addr secret;
3258 unsigned char hwaddr[MAX_ADDR_LEN];
3263 struct in6_addr secret;
3264 struct in6_addr temp;
3265 struct net *net = dev_net(idev->dev);
3267 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3269 if (idev->cnf.stable_secret.initialized)
3270 secret = idev->cnf.stable_secret.secret;
3271 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3272 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3277 spin_lock_bh(&lock);
3280 memset(&data, 0, sizeof(data));
3281 memset(workspace, 0, sizeof(workspace));
3282 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3283 data.prefix[0] = address->s6_addr32[0];
3284 data.prefix[1] = address->s6_addr32[1];
3285 data.secret = secret;
3286 data.dad_count = dad_count;
3288 sha1_transform(digest, data.__data, workspace);
3291 temp.s6_addr32[2] = (__force __be32)digest[0];
3292 temp.s6_addr32[3] = (__force __be32)digest[1];
3294 spin_unlock_bh(&lock);
3296 if (ipv6_reserved_interfaceid(temp)) {
3298 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3307 static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3309 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3313 s = &idev->cnf.stable_secret;
3314 get_random_bytes(&s->secret, sizeof(s->secret));
3315 s->initialized = true;
3318 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3320 struct in6_addr addr;
3322 /* no link local addresses on L3 master devices */
3323 if (netif_is_l3_master(idev->dev))
3326 /* no link local addresses on devices flagged as slaves */
3327 if (idev->dev->flags & IFF_SLAVE)
3330 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3332 switch (idev->cnf.addr_gen_mode) {
3333 case IN6_ADDR_GEN_MODE_RANDOM:
3334 ipv6_gen_mode_random_init(idev);
3336 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
3337 if (!ipv6_generate_stable_address(&addr, 0, idev))
3338 addrconf_add_linklocal(idev, &addr,
3339 IFA_F_STABLE_PRIVACY);
3340 else if (prefix_route)
3341 addrconf_prefix_route(&addr, 64, 0, idev->dev,
3344 case IN6_ADDR_GEN_MODE_EUI64:
3345 /* addrconf_add_linklocal also adds a prefix_route and we
3346 * only need to care about prefix routes if ipv6_generate_eui64
3347 * couldn't generate one.
3349 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3350 addrconf_add_linklocal(idev, &addr, 0);
3351 else if (prefix_route)
3352 addrconf_prefix_route(&addr, 64, 0, idev->dev,
3355 case IN6_ADDR_GEN_MODE_NONE:
3357 /* will not add any link local address */
3362 static void addrconf_dev_config(struct net_device *dev)
3364 struct inet6_dev *idev;
3368 if ((dev->type != ARPHRD_ETHER) &&
3369 (dev->type != ARPHRD_FDDI) &&
3370 (dev->type != ARPHRD_ARCNET) &&
3371 (dev->type != ARPHRD_INFINIBAND) &&
3372 (dev->type != ARPHRD_IEEE1394) &&
3373 (dev->type != ARPHRD_TUNNEL6) &&
3374 (dev->type != ARPHRD_6LOWPAN) &&
3375 (dev->type != ARPHRD_TUNNEL) &&
3376 (dev->type != ARPHRD_NONE) &&
3377 (dev->type != ARPHRD_RAWIP)) {
3378 /* Alas, we support only Ethernet autoconfiguration. */
3379 idev = __in6_dev_get(dev);
3380 if (!IS_ERR_OR_NULL(idev) && dev->flags & IFF_UP &&
3381 dev->flags & IFF_MULTICAST)
3386 idev = addrconf_add_dev(dev);
3390 /* this device type has no EUI support */
3391 if (dev->type == ARPHRD_NONE &&
3392 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3393 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
3395 addrconf_addr_gen(idev, false);
3398 #if IS_ENABLED(CONFIG_IPV6_SIT)
3399 static void addrconf_sit_config(struct net_device *dev)
3401 struct inet6_dev *idev;
3406 * Configure the tunnel with one of our IPv4
3407 * addresses... we should configure all of
3408 * our v4 addrs in the tunnel
3411 idev = ipv6_find_idev(dev);
3413 pr_debug("%s: add_dev failed\n", __func__);
3417 if (dev->priv_flags & IFF_ISATAP) {
3418 addrconf_addr_gen(idev, false);
3424 if (dev->flags&IFF_POINTOPOINT)
3425 addrconf_add_mroute(dev);
3429 #if IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE)
3430 static void addrconf_gre_config(struct net_device *dev)
3432 struct inet6_dev *idev;
3436 idev = ipv6_find_idev(dev);
3438 pr_debug("%s: add_dev failed\n", __func__);
3442 if (dev->type == ARPHRD_ETHER) {
3443 addrconf_addr_gen(idev, true);
3449 if (dev->flags & IFF_POINTOPOINT)
3450 addrconf_add_mroute(dev);
3454 static int fixup_permanent_addr(struct net *net,
3455 struct inet6_dev *idev,
3456 struct inet6_ifaddr *ifp)
3458 /* !fib6_node means the host route was removed from the
3459 * FIB, for example, if 'lo' device is taken down. In that
3460 * case regenerate the host route.
3462 if (!ifp->rt || !ifp->rt->fib6_node) {
3463 struct fib6_info *f6i, *prev;
3465 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false,
3468 return PTR_ERR(f6i);
3470 /* ifp->rt can be accessed outside of rtnl */
3471 spin_lock(&ifp->lock);
3474 spin_unlock(&ifp->lock);
3476 fib6_info_release(prev);
3479 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3480 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3481 ifp->rt_priority, idev->dev, 0, 0,
3485 if (ifp->state == INET6_IFADDR_STATE_PREDAD)
3486 addrconf_dad_start(ifp);
3491 static void addrconf_permanent_addr(struct net *net, struct net_device *dev)
3493 struct inet6_ifaddr *ifp, *tmp;
3494 struct inet6_dev *idev;
3496 idev = __in6_dev_get(dev);
3500 write_lock_bh(&idev->lock);
3502 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3503 if ((ifp->flags & IFA_F_PERMANENT) &&
3504 fixup_permanent_addr(net, idev, ifp) < 0) {
3505 write_unlock_bh(&idev->lock);
3508 write_lock_bh(&idev->lock);
3510 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3511 idev->dev->name, &ifp->addr);
3515 write_unlock_bh(&idev->lock);
3518 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3521 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3522 struct netdev_notifier_change_info *change_info;
3523 struct netdev_notifier_changeupper_info *info;
3524 struct inet6_dev *idev = __in6_dev_get(dev);
3525 struct net *net = dev_net(dev);
3526 int run_pending = 0;
3530 case NETDEV_REGISTER:
3531 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3532 idev = ipv6_add_dev(dev);
3534 return notifier_from_errno(PTR_ERR(idev));
3538 case NETDEV_CHANGEMTU:
3539 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3540 if (dev->mtu < IPV6_MIN_MTU) {
3541 addrconf_ifdown(dev, dev != net->loopback_dev);
3546 rt6_mtu_change(dev, dev->mtu);
3547 idev->cnf.mtu6 = dev->mtu;
3551 /* allocate new idev */
3552 idev = ipv6_add_dev(dev);
3556 /* device is still not ready */
3557 if (!(idev->if_flags & IF_READY))
3564 if (dev->flags & IFF_SLAVE)
3567 if (idev && idev->cnf.disable_ipv6)
3570 if (event == NETDEV_UP) {
3571 /* restore routes for permanent addresses */
3572 addrconf_permanent_addr(net, dev);
3574 if (!addrconf_link_ready(dev)) {
3575 /* device is not ready yet. */
3576 pr_debug("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3581 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3582 idev = ipv6_add_dev(dev);
3584 if (!IS_ERR_OR_NULL(idev)) {
3585 idev->if_flags |= IF_READY;
3588 } else if (event == NETDEV_CHANGE) {
3589 if (!addrconf_link_ready(dev)) {
3590 /* device is still not ready. */
3591 rt6_sync_down_dev(dev, event);
3595 if (!IS_ERR_OR_NULL(idev)) {
3596 if (idev->if_flags & IF_READY) {
3597 /* device is already configured -
3598 * but resend MLD reports, we might
3599 * have roamed and need to update
3600 * multicast snooping switches
3604 if (change_info->flags_changed & IFF_NOARP)
3605 addrconf_dad_run(idev, true);
3606 rt6_sync_up(dev, RTNH_F_LINKDOWN);
3609 idev->if_flags |= IF_READY;
3612 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3618 switch (dev->type) {
3619 #if IS_ENABLED(CONFIG_IPV6_SIT)
3621 addrconf_sit_config(dev);
3624 #if IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE)
3627 addrconf_gre_config(dev);
3630 case ARPHRD_LOOPBACK:
3635 addrconf_dev_config(dev);
3639 if (!IS_ERR_OR_NULL(idev)) {
3641 addrconf_dad_run(idev, false);
3643 /* Device has an address by now */
3644 rt6_sync_up(dev, RTNH_F_DEAD);
3647 * If the MTU changed during the interface down,
3648 * when the interface up, the changed MTU must be
3649 * reflected in the idev as well as routers.
3651 if (idev->cnf.mtu6 != dev->mtu &&
3652 dev->mtu >= IPV6_MIN_MTU) {
3653 rt6_mtu_change(dev, dev->mtu);
3654 idev->cnf.mtu6 = dev->mtu;
3656 idev->tstamp = jiffies;
3657 inet6_ifinfo_notify(RTM_NEWLINK, idev);
3660 * If the changed mtu during down is lower than
3661 * IPV6_MIN_MTU stop IPv6 on this interface.
3663 if (dev->mtu < IPV6_MIN_MTU)
3664 addrconf_ifdown(dev, dev != net->loopback_dev);
3669 case NETDEV_UNREGISTER:
3671 * Remove all addresses from this interface.
3673 addrconf_ifdown(dev, event != NETDEV_DOWN);
3676 case NETDEV_CHANGENAME:
3678 snmp6_unregister_dev(idev);
3679 addrconf_sysctl_unregister(idev);
3680 err = addrconf_sysctl_register(idev);
3682 return notifier_from_errno(err);
3683 err = snmp6_register_dev(idev);
3685 addrconf_sysctl_unregister(idev);
3686 return notifier_from_errno(err);
3691 case NETDEV_PRE_TYPE_CHANGE:
3692 case NETDEV_POST_TYPE_CHANGE:
3694 addrconf_type_change(dev, event);
3697 case NETDEV_CHANGEUPPER:
3700 /* flush all routes if dev is linked to or unlinked from
3701 * an L3 master device (e.g., VRF)
3703 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3704 addrconf_ifdown(dev, false);
3711 * addrconf module should be notified of a device going up
3713 static struct notifier_block ipv6_dev_notf = {
3714 .notifier_call = addrconf_notify,
3715 .priority = ADDRCONF_NOTIFY_PRIORITY,
3718 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3720 struct inet6_dev *idev;
3723 idev = __in6_dev_get(dev);
3725 if (event == NETDEV_POST_TYPE_CHANGE)
3726 ipv6_mc_remap(idev);
3727 else if (event == NETDEV_PRE_TYPE_CHANGE)
3728 ipv6_mc_unmap(idev);
3731 static bool addr_is_local(const struct in6_addr *addr)
3733 return ipv6_addr_type(addr) &
3734 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3737 static int addrconf_ifdown(struct net_device *dev, bool unregister)
3739 unsigned long event = unregister ? NETDEV_UNREGISTER : NETDEV_DOWN;
3740 struct net *net = dev_net(dev);
3741 struct inet6_dev *idev;
3742 struct inet6_ifaddr *ifa;
3743 LIST_HEAD(tmp_addr_list);
3744 bool keep_addr = false;
3750 rt6_disable_ip(dev, event);
3752 idev = __in6_dev_get(dev);
3757 * Step 1: remove reference to ipv6 device from parent device.
3763 /* protected by rtnl_lock */
3764 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3766 /* Step 1.5: remove snmp6 entry */
3767 snmp6_unregister_dev(idev);
3771 /* combine the user config with event to determine if permanent
3772 * addresses are to be removed from address hash table
3774 if (!unregister && !idev->cnf.disable_ipv6) {
3775 /* aggregate the system setting and interface setting */
3776 int _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3779 _keep_addr = idev->cnf.keep_addr_on_down;
3781 keep_addr = (_keep_addr > 0);
3784 /* Step 2: clear hash table */
3785 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3786 struct hlist_head *h = &net->ipv6.inet6_addr_lst[i];
3788 spin_lock_bh(&net->ipv6.addrconf_hash_lock);
3790 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3791 if (ifa->idev == idev) {
3792 addrconf_del_dad_work(ifa);
3793 /* combined flag + permanent flag decide if
3794 * address is retained on a down event
3797 !(ifa->flags & IFA_F_PERMANENT) ||
3798 addr_is_local(&ifa->addr)) {
3799 hlist_del_init_rcu(&ifa->addr_lst);
3804 spin_unlock_bh(&net->ipv6.addrconf_hash_lock);
3807 write_lock_bh(&idev->lock);
3809 addrconf_del_rs_timer(idev);
3811 /* Step 2: clear flags for stateless addrconf, repeated down
3814 was_ready = idev->if_flags & IF_READY;
3816 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3818 /* Step 3: clear tempaddr list */
3819 while (!list_empty(&idev->tempaddr_list)) {
3820 ifa = list_first_entry(&idev->tempaddr_list,
3821 struct inet6_ifaddr, tmp_list);
3822 list_del(&ifa->tmp_list);
3823 write_unlock_bh(&idev->lock);
3824 spin_lock_bh(&ifa->lock);
3827 in6_ifa_put(ifa->ifpub);
3830 spin_unlock_bh(&ifa->lock);
3832 write_lock_bh(&idev->lock);
3835 list_for_each_entry(ifa, &idev->addr_list, if_list)
3836 list_add_tail(&ifa->if_list_aux, &tmp_addr_list);
3837 write_unlock_bh(&idev->lock);
3839 while (!list_empty(&tmp_addr_list)) {
3840 struct fib6_info *rt = NULL;
3843 ifa = list_first_entry(&tmp_addr_list,
3844 struct inet6_ifaddr, if_list_aux);
3845 list_del(&ifa->if_list_aux);
3847 addrconf_del_dad_work(ifa);
3849 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3850 !addr_is_local(&ifa->addr);
3852 spin_lock_bh(&ifa->lock);
3855 /* set state to skip the notifier below */
3856 state = INET6_IFADDR_STATE_DEAD;
3857 ifa->state = INET6_IFADDR_STATE_PREDAD;
3858 if (!(ifa->flags & IFA_F_NODAD))
3859 ifa->flags |= IFA_F_TENTATIVE;
3865 ifa->state = INET6_IFADDR_STATE_DEAD;
3868 spin_unlock_bh(&ifa->lock);
3871 ip6_del_rt(net, rt, false);
3873 if (state != INET6_IFADDR_STATE_DEAD) {
3874 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3875 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3877 if (idev->cnf.forwarding)
3878 addrconf_leave_anycast(ifa);
3879 addrconf_leave_solict(ifa->idev, &ifa->addr);
3883 write_lock_bh(&idev->lock);
3884 list_del_rcu(&ifa->if_list);
3885 write_unlock_bh(&idev->lock);
3890 /* Step 5: Discard anycast and multicast list */
3892 ipv6_ac_destroy_dev(idev);
3893 ipv6_mc_destroy_dev(idev);
3894 } else if (was_ready) {
3898 idev->tstamp = jiffies;
3901 /* Last: Shot the device (if unregistered) */
3903 addrconf_sysctl_unregister(idev);
3904 neigh_parms_release(&nd_tbl, idev->nd_parms);
3905 neigh_ifdown(&nd_tbl, dev);
3911 static void addrconf_rs_timer(struct timer_list *t)
3913 struct inet6_dev *idev = from_timer(idev, t, rs_timer);
3914 struct net_device *dev = idev->dev;
3915 struct in6_addr lladdr;
3917 write_lock(&idev->lock);
3918 if (idev->dead || !(idev->if_flags & IF_READY))
3921 if (!ipv6_accept_ra(idev))
3924 /* Announcement received after solicitation was sent */
3925 if (idev->if_flags & IF_RA_RCVD)
3928 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
3929 write_unlock(&idev->lock);
3930 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3931 ndisc_send_rs(dev, &lladdr,
3932 &in6addr_linklocal_allrouters);
3936 write_lock(&idev->lock);
3937 idev->rs_interval = rfc3315_s14_backoff_update(
3938 idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
3939 /* The wait after the last probe can be shorter */
3940 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3941 idev->cnf.rtr_solicits) ?
3942 idev->cnf.rtr_solicit_delay :
3946 * Note: we do not support deprecated "all on-link"
3947 * assumption any longer.
3949 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3953 write_unlock(&idev->lock);
3959 * Duplicate Address Detection
3961 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3963 unsigned long rand_num;
3964 struct inet6_dev *idev = ifp->idev;
3967 if (ifp->flags & IFA_F_OPTIMISTIC)
3970 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3973 if (idev->cnf.enhanced_dad ||
3974 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) {
3976 get_random_bytes(&nonce, 6);
3979 ifp->dad_nonce = nonce;
3980 ifp->dad_probes = idev->cnf.dad_transmits;
3981 addrconf_mod_dad_work(ifp, rand_num);
3984 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3986 struct inet6_dev *idev = ifp->idev;
3987 struct net_device *dev = idev->dev;
3988 bool bump_id, notify = false;
3991 addrconf_join_solict(dev, &ifp->addr);
3993 read_lock_bh(&idev->lock);
3994 spin_lock(&ifp->lock);
3995 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3999 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
4000 (net->ipv6.devconf_all->accept_dad < 1 &&
4001 idev->cnf.accept_dad < 1) ||
4002 !(ifp->flags&IFA_F_TENTATIVE) ||
4003 ifp->flags & IFA_F_NODAD) {
4004 bool send_na = false;
4006 if (ifp->flags & IFA_F_TENTATIVE &&
4007 !(ifp->flags & IFA_F_OPTIMISTIC))
4009 bump_id = ifp->flags & IFA_F_TENTATIVE;
4010 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
4011 spin_unlock(&ifp->lock);
4012 read_unlock_bh(&idev->lock);
4014 addrconf_dad_completed(ifp, bump_id, send_na);
4018 if (!(idev->if_flags & IF_READY)) {
4019 spin_unlock(&ifp->lock);
4020 read_unlock_bh(&idev->lock);
4022 * If the device is not ready:
4023 * - keep it tentative if it is a permanent address.
4024 * - otherwise, kill it.
4027 addrconf_dad_stop(ifp, 0);
4032 * Optimistic nodes can start receiving
4035 if (ifp->flags & IFA_F_OPTIMISTIC) {
4036 ip6_ins_rt(net, ifp->rt);
4037 if (ipv6_use_optimistic_addr(net, idev)) {
4038 /* Because optimistic nodes can use this address,
4039 * notify listeners. If DAD fails, RTM_DELADDR is sent.
4045 addrconf_dad_kick(ifp);
4047 spin_unlock(&ifp->lock);
4048 read_unlock_bh(&idev->lock);
4050 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4053 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
4055 bool begin_dad = false;
4057 spin_lock_bh(&ifp->lock);
4058 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
4059 ifp->state = INET6_IFADDR_STATE_PREDAD;
4062 spin_unlock_bh(&ifp->lock);
4065 addrconf_mod_dad_work(ifp, 0);
4068 static void addrconf_dad_work(struct work_struct *w)
4070 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
4071 struct inet6_ifaddr,
4073 struct inet6_dev *idev = ifp->idev;
4074 bool bump_id, disable_ipv6 = false;
4075 struct in6_addr mcaddr;
4081 } action = DAD_PROCESS;
4085 spin_lock_bh(&ifp->lock);
4086 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
4088 ifp->state = INET6_IFADDR_STATE_DAD;
4089 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
4091 ifp->state = INET6_IFADDR_STATE_POSTDAD;
4093 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 ||
4094 idev->cnf.accept_dad > 1) &&
4095 !idev->cnf.disable_ipv6 &&
4096 !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
4097 struct in6_addr addr;
4099 addr.s6_addr32[0] = htonl(0xfe800000);
4100 addr.s6_addr32[1] = 0;
4102 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
4103 ipv6_addr_equal(&ifp->addr, &addr)) {
4104 /* DAD failed for link-local based on MAC */
4105 idev->cnf.disable_ipv6 = 1;
4107 pr_info("%s: IPv6 being disabled!\n",
4108 ifp->idev->dev->name);
4109 disable_ipv6 = true;
4113 spin_unlock_bh(&ifp->lock);
4115 if (action == DAD_BEGIN) {
4116 addrconf_dad_begin(ifp);
4118 } else if (action == DAD_ABORT) {
4120 addrconf_dad_stop(ifp, 1);
4122 addrconf_ifdown(idev->dev, false);
4126 if (!ifp->dad_probes && addrconf_dad_end(ifp))
4129 write_lock_bh(&idev->lock);
4130 if (idev->dead || !(idev->if_flags & IF_READY)) {
4131 write_unlock_bh(&idev->lock);
4135 spin_lock(&ifp->lock);
4136 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
4137 spin_unlock(&ifp->lock);
4138 write_unlock_bh(&idev->lock);
4142 if (ifp->dad_probes == 0) {
4143 bool send_na = false;
4146 * DAD was successful
4149 if (ifp->flags & IFA_F_TENTATIVE &&
4150 !(ifp->flags & IFA_F_OPTIMISTIC))
4152 bump_id = ifp->flags & IFA_F_TENTATIVE;
4153 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
4154 spin_unlock(&ifp->lock);
4155 write_unlock_bh(&idev->lock);
4157 addrconf_dad_completed(ifp, bump_id, send_na);
4163 addrconf_mod_dad_work(ifp,
4164 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME),
4166 spin_unlock(&ifp->lock);
4167 write_unlock_bh(&idev->lock);
4169 /* send a neighbour solicitation for our addr */
4170 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
4171 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
4178 /* ifp->idev must be at least read locked */
4179 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
4181 struct inet6_ifaddr *ifpiter;
4182 struct inet6_dev *idev = ifp->idev;
4184 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
4185 if (ifpiter->scope > IFA_LINK)
4187 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
4188 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
4189 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
4196 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
4199 struct net_device *dev = ifp->idev->dev;
4200 struct in6_addr lladdr;
4201 bool send_rs, send_mld;
4203 addrconf_del_dad_work(ifp);
4206 * Configure the address for reception. Now it is valid.
4209 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4211 /* If added prefix is link local and we are prepared to process
4212 router advertisements, start sending router solicitations.
4215 read_lock_bh(&ifp->idev->lock);
4216 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
4217 send_rs = send_mld &&
4218 ipv6_accept_ra(ifp->idev) &&
4219 ifp->idev->cnf.rtr_solicits != 0 &&
4220 (dev->flags & IFF_LOOPBACK) == 0 &&
4221 (dev->type != ARPHRD_TUNNEL);
4222 read_unlock_bh(&ifp->idev->lock);
4224 /* While dad is in progress mld report's source address is in6_addrany.
4225 * Resend with proper ll now.
4228 ipv6_mc_dad_complete(ifp->idev);
4230 /* send unsolicited NA if enabled */
4232 (ifp->idev->cnf.ndisc_notify ||
4233 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) {
4234 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr,
4235 /*router=*/ !!ifp->idev->cnf.forwarding,
4236 /*solicited=*/ false, /*override=*/ true,
4242 * If a host as already performed a random delay
4243 * [...] as part of DAD [...] there is no need
4244 * to delay again before sending the first RS
4246 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
4248 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
4250 write_lock_bh(&ifp->idev->lock);
4251 spin_lock(&ifp->lock);
4252 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4253 ifp->idev->cnf.rtr_solicit_interval);
4254 ifp->idev->rs_probes = 1;
4255 ifp->idev->if_flags |= IF_RS_SENT;
4256 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
4257 spin_unlock(&ifp->lock);
4258 write_unlock_bh(&ifp->idev->lock);
4262 rt_genid_bump_ipv6(dev_net(dev));
4264 /* Make sure that a new temporary address will be created
4265 * before this temporary address becomes deprecated.
4267 if (ifp->flags & IFA_F_TEMPORARY)
4268 addrconf_verify_rtnl(dev_net(dev));
4271 static void addrconf_dad_run(struct inet6_dev *idev, bool restart)
4273 struct inet6_ifaddr *ifp;
4275 read_lock_bh(&idev->lock);
4276 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4277 spin_lock(&ifp->lock);
4278 if ((ifp->flags & IFA_F_TENTATIVE &&
4279 ifp->state == INET6_IFADDR_STATE_DAD) || restart) {
4281 ifp->state = INET6_IFADDR_STATE_PREDAD;
4282 addrconf_dad_kick(ifp);
4284 spin_unlock(&ifp->lock);
4286 read_unlock_bh(&idev->lock);
4289 #ifdef CONFIG_PROC_FS
4290 struct if6_iter_state {
4291 struct seq_net_private p;
4296 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
4298 struct if6_iter_state *state = seq->private;
4299 struct net *net = seq_file_net(seq);
4300 struct inet6_ifaddr *ifa = NULL;
4303 /* initial bucket if pos is 0 */
4309 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
4310 hlist_for_each_entry_rcu(ifa, &net->ipv6.inet6_addr_lst[state->bucket],
4312 /* sync with offset */
4313 if (p < state->offset) {
4320 /* prepare for next bucket */
4327 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4328 struct inet6_ifaddr *ifa)
4330 struct if6_iter_state *state = seq->private;
4331 struct net *net = seq_file_net(seq);
4333 hlist_for_each_entry_continue_rcu(ifa, addr_lst) {
4339 while (++state->bucket < IN6_ADDR_HSIZE) {
4340 hlist_for_each_entry_rcu(ifa,
4341 &net->ipv6.inet6_addr_lst[state->bucket], addr_lst) {
4349 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4353 return if6_get_first(seq, *pos);
4356 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4358 struct inet6_ifaddr *ifa;
4360 ifa = if6_get_next(seq, v);
4365 static void if6_seq_stop(struct seq_file *seq, void *v)
4371 static int if6_seq_show(struct seq_file *seq, void *v)
4373 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4374 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
4376 ifp->idev->dev->ifindex,
4380 ifp->idev->dev->name);
4384 static const struct seq_operations if6_seq_ops = {
4385 .start = if6_seq_start,
4386 .next = if6_seq_next,
4387 .show = if6_seq_show,
4388 .stop = if6_seq_stop,
4391 static int __net_init if6_proc_net_init(struct net *net)
4393 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops,
4394 sizeof(struct if6_iter_state)))
4399 static void __net_exit if6_proc_net_exit(struct net *net)
4401 remove_proc_entry("if_inet6", net->proc_net);
4404 static struct pernet_operations if6_proc_net_ops = {
4405 .init = if6_proc_net_init,
4406 .exit = if6_proc_net_exit,
4409 int __init if6_proc_init(void)
4411 return register_pernet_subsys(&if6_proc_net_ops);
4414 void if6_proc_exit(void)
4416 unregister_pernet_subsys(&if6_proc_net_ops);
4418 #endif /* CONFIG_PROC_FS */
4420 #if IS_ENABLED(CONFIG_IPV6_MIP6)
4421 /* Check if address is a home address configured on any interface. */
4422 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
4424 unsigned int hash = inet6_addr_hash(net, addr);
4425 struct inet6_ifaddr *ifp = NULL;
4429 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
4430 if (ipv6_addr_equal(&ifp->addr, addr) &&
4431 (ifp->flags & IFA_F_HOMEADDRESS)) {
4441 /* RFC6554 has some algorithm to avoid loops in segment routing by
4442 * checking if the segments contains any of a local interface address.
4446 * To detect loops in the SRH, a router MUST determine if the SRH
4447 * includes multiple addresses assigned to any interface on that router.
4448 * If such addresses appear more than once and are separated by at least
4449 * one address not assigned to that router.
4451 int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs,
4452 unsigned char nsegs)
4454 const struct in6_addr *addr;
4455 int i, ret = 0, found = 0;
4456 struct inet6_ifaddr *ifp;
4457 bool separated = false;
4462 for (i = 0; i < nsegs; i++) {
4464 hash = inet6_addr_hash(net, addr);
4467 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
4469 if (ipv6_addr_equal(&ifp->addr, addr)) {
4476 if (found > 1 && separated) {
4493 * Periodic address status verification
4496 static void addrconf_verify_rtnl(struct net *net)
4498 unsigned long now, next, next_sec, next_sched;
4499 struct inet6_ifaddr *ifp;
4506 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
4508 cancel_delayed_work(&net->ipv6.addr_chk_work);
4510 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
4512 hlist_for_each_entry_rcu_bh(ifp, &net->ipv6.inet6_addr_lst[i], addr_lst) {
4515 /* When setting preferred_lft to a value not zero or
4516 * infinity, while valid_lft is infinity
4517 * IFA_F_PERMANENT has a non-infinity life time.
4519 if ((ifp->flags & IFA_F_PERMANENT) &&
4520 (ifp->prefered_lft == INFINITY_LIFE_TIME))
4523 spin_lock(&ifp->lock);
4524 /* We try to batch several events at once. */
4525 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
4527 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4528 age >= ifp->valid_lft) {
4529 spin_unlock(&ifp->lock);
4531 rcu_read_unlock_bh();
4535 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4536 spin_unlock(&ifp->lock);
4538 } else if (age >= ifp->prefered_lft) {
4539 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
4542 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4544 ifp->flags |= IFA_F_DEPRECATED;
4547 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4548 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
4549 next = ifp->tstamp + ifp->valid_lft * HZ;
4551 spin_unlock(&ifp->lock);
4556 ipv6_ifa_notify(0, ifp);
4560 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4561 !(ifp->flags&IFA_F_TENTATIVE)) {
4562 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4563 ifp->idev->cnf.dad_transmits *
4564 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME), HZ/100) / HZ;
4566 if (age >= ifp->prefered_lft - regen_advance) {
4567 struct inet6_ifaddr *ifpub = ifp->ifpub;
4568 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4569 next = ifp->tstamp + ifp->prefered_lft * HZ;
4570 if (!ifp->regen_count && ifpub) {
4573 in6_ifa_hold(ifpub);
4574 spin_unlock(&ifp->lock);
4576 spin_lock(&ifpub->lock);
4577 ifpub->regen_count = 0;
4578 spin_unlock(&ifpub->lock);
4579 rcu_read_unlock_bh();
4580 ipv6_create_tempaddr(ifpub, true);
4586 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4587 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4588 spin_unlock(&ifp->lock);
4590 /* ifp->prefered_lft <= ifp->valid_lft */
4591 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4592 next = ifp->tstamp + ifp->prefered_lft * HZ;
4593 spin_unlock(&ifp->lock);
4598 next_sec = round_jiffies_up(next);
4601 /* If rounded timeout is accurate enough, accept it. */
4602 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4603 next_sched = next_sec;
4605 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4606 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4607 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4609 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4610 now, next, next_sec, next_sched);
4611 mod_delayed_work(addrconf_wq, &net->ipv6.addr_chk_work, next_sched - now);
4612 rcu_read_unlock_bh();
4615 static void addrconf_verify_work(struct work_struct *w)
4617 struct net *net = container_of(to_delayed_work(w), struct net,
4618 ipv6.addr_chk_work);
4621 addrconf_verify_rtnl(net);
4625 static void addrconf_verify(struct net *net)
4627 mod_delayed_work(addrconf_wq, &net->ipv6.addr_chk_work, 0);
4630 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4631 struct in6_addr **peer_pfx)
4633 struct in6_addr *pfx = NULL;
4638 pfx = nla_data(addr);
4641 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4643 pfx = nla_data(local);
4649 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4650 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4651 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4652 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
4653 [IFA_FLAGS] = { .len = sizeof(u32) },
4654 [IFA_RT_PRIORITY] = { .len = sizeof(u32) },
4655 [IFA_TARGET_NETNSID] = { .type = NLA_S32 },
4656 [IFA_PROTO] = { .type = NLA_U8 },
4660 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
4661 struct netlink_ext_ack *extack)
4663 struct net *net = sock_net(skb->sk);
4664 struct ifaddrmsg *ifm;
4665 struct nlattr *tb[IFA_MAX+1];
4666 struct in6_addr *pfx, *peer_pfx;
4670 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4671 ifa_ipv6_policy, extack);
4675 ifm = nlmsg_data(nlh);
4676 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4680 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4682 /* We ignore other flags so far. */
4683 ifa_flags &= IFA_F_MANAGETEMPADDR;
4685 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4686 ifm->ifa_prefixlen);
4689 static int modify_prefix_route(struct inet6_ifaddr *ifp,
4690 unsigned long expires, u32 flags,
4693 struct fib6_info *f6i;
4696 f6i = addrconf_get_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
4698 ifp->idev->dev, 0, RTF_DEFAULT, true);
4702 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF;
4703 if (f6i->fib6_metric != prio) {
4704 /* delete old one */
4705 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false);
4708 addrconf_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
4710 ifp->rt_priority, ifp->idev->dev,
4711 expires, flags, GFP_KERNEL);
4714 fib6_clean_expires(f6i);
4716 fib6_set_expires(f6i, expires);
4718 fib6_info_release(f6i);
4724 static int inet6_addr_modify(struct net *net, struct inet6_ifaddr *ifp,
4725 struct ifa6_config *cfg)
4729 unsigned long timeout;
4730 bool was_managetempaddr;
4731 bool had_prefixroute;
4732 bool new_peer = false;
4736 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
4739 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR &&
4740 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4743 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED)
4744 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC;
4746 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
4747 if (addrconf_finite_timeout(timeout)) {
4748 expires = jiffies_to_clock_t(timeout * HZ);
4749 cfg->valid_lft = timeout;
4750 flags = RTF_EXPIRES;
4754 cfg->ifa_flags |= IFA_F_PERMANENT;
4757 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
4758 if (addrconf_finite_timeout(timeout)) {
4760 cfg->ifa_flags |= IFA_F_DEPRECATED;
4761 cfg->preferred_lft = timeout;
4764 if (cfg->peer_pfx &&
4765 memcmp(&ifp->peer_addr, cfg->peer_pfx, sizeof(struct in6_addr))) {
4766 if (!ipv6_addr_any(&ifp->peer_addr))
4767 cleanup_prefix_route(ifp, expires, true, true);
4771 spin_lock_bh(&ifp->lock);
4772 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4773 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4774 !(ifp->flags & IFA_F_NOPREFIXROUTE);
4775 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4776 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4777 IFA_F_NOPREFIXROUTE);
4778 ifp->flags |= cfg->ifa_flags;
4779 ifp->tstamp = jiffies;
4780 ifp->valid_lft = cfg->valid_lft;
4781 ifp->prefered_lft = cfg->preferred_lft;
4782 ifp->ifa_proto = cfg->ifa_proto;
4784 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority)
4785 ifp->rt_priority = cfg->rt_priority;
4788 ifp->peer_addr = *cfg->peer_pfx;
4790 spin_unlock_bh(&ifp->lock);
4791 if (!(ifp->flags&IFA_F_TENTATIVE))
4792 ipv6_ifa_notify(0, ifp);
4794 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
4797 if (had_prefixroute)
4798 rc = modify_prefix_route(ifp, expires, flags, false);
4800 /* prefix route could have been deleted; if so restore it */
4801 if (rc == -ENOENT) {
4802 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
4803 ifp->rt_priority, ifp->idev->dev,
4804 expires, flags, GFP_KERNEL);
4807 if (had_prefixroute && !ipv6_addr_any(&ifp->peer_addr))
4808 rc = modify_prefix_route(ifp, expires, flags, true);
4810 if (rc == -ENOENT && !ipv6_addr_any(&ifp->peer_addr)) {
4811 addrconf_prefix_route(&ifp->peer_addr, ifp->prefix_len,
4812 ifp->rt_priority, ifp->idev->dev,
4813 expires, flags, GFP_KERNEL);
4815 } else if (had_prefixroute) {
4816 enum cleanup_prefix_rt_t action;
4817 unsigned long rt_expires;
4819 write_lock_bh(&ifp->idev->lock);
4820 action = check_cleanup_prefix_route(ifp, &rt_expires);
4821 write_unlock_bh(&ifp->idev->lock);
4823 if (action != CLEANUP_PREFIX_RT_NOP) {
4824 cleanup_prefix_route(ifp, rt_expires,
4825 action == CLEANUP_PREFIX_RT_DEL, false);
4829 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4830 if (was_managetempaddr &&
4831 !(ifp->flags & IFA_F_MANAGETEMPADDR)) {
4833 cfg->preferred_lft = 0;
4835 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft,
4836 cfg->preferred_lft, !was_managetempaddr,
4840 addrconf_verify_rtnl(net);
4846 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
4847 struct netlink_ext_ack *extack)
4849 struct net *net = sock_net(skb->sk);
4850 struct ifaddrmsg *ifm;
4851 struct nlattr *tb[IFA_MAX+1];
4852 struct in6_addr *peer_pfx;
4853 struct inet6_ifaddr *ifa;
4854 struct net_device *dev;
4855 struct inet6_dev *idev;
4856 struct ifa6_config cfg;
4859 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4860 ifa_ipv6_policy, extack);
4864 memset(&cfg, 0, sizeof(cfg));
4866 ifm = nlmsg_data(nlh);
4867 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4871 cfg.peer_pfx = peer_pfx;
4872 cfg.plen = ifm->ifa_prefixlen;
4873 if (tb[IFA_RT_PRIORITY])
4874 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]);
4877 cfg.ifa_proto = nla_get_u8(tb[IFA_PROTO]);
4879 cfg.valid_lft = INFINITY_LIFE_TIME;
4880 cfg.preferred_lft = INFINITY_LIFE_TIME;
4882 if (tb[IFA_CACHEINFO]) {
4883 struct ifa_cacheinfo *ci;
4885 ci = nla_data(tb[IFA_CACHEINFO]);
4886 cfg.valid_lft = ci->ifa_valid;
4887 cfg.preferred_lft = ci->ifa_prefered;
4890 dev = __dev_get_by_index(net, ifm->ifa_index);
4895 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]);
4897 cfg.ifa_flags = ifm->ifa_flags;
4899 /* We ignore other flags so far. */
4900 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS |
4901 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE |
4902 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC;
4904 idev = ipv6_find_idev(dev);
4906 return PTR_ERR(idev);
4908 if (!ipv6_allow_optimistic_dad(net, idev))
4909 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC;
4911 if (cfg.ifa_flags & IFA_F_NODAD &&
4912 cfg.ifa_flags & IFA_F_OPTIMISTIC) {
4913 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive");
4917 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1);
4920 * It would be best to check for !NLM_F_CREATE here but
4921 * userspace already relies on not having to provide this.
4923 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack);
4926 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4927 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4930 err = inet6_addr_modify(net, ifa, &cfg);
4937 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4938 u8 scope, int ifindex)
4940 struct ifaddrmsg *ifm;
4942 ifm = nlmsg_data(nlh);
4943 ifm->ifa_family = AF_INET6;
4944 ifm->ifa_prefixlen = prefixlen;
4945 ifm->ifa_flags = flags;
4946 ifm->ifa_scope = scope;
4947 ifm->ifa_index = ifindex;
4950 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4951 unsigned long tstamp, u32 preferred, u32 valid)
4953 struct ifa_cacheinfo ci;
4955 ci.cstamp = cstamp_delta(cstamp);
4956 ci.tstamp = cstamp_delta(tstamp);
4957 ci.ifa_prefered = preferred;
4958 ci.ifa_valid = valid;
4960 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4963 static inline int rt_scope(int ifa_scope)
4965 if (ifa_scope & IFA_HOST)
4966 return RT_SCOPE_HOST;
4967 else if (ifa_scope & IFA_LINK)
4968 return RT_SCOPE_LINK;
4969 else if (ifa_scope & IFA_SITE)
4970 return RT_SCOPE_SITE;
4972 return RT_SCOPE_UNIVERSE;
4975 static inline int inet6_ifaddr_msgsize(void)
4977 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4978 + nla_total_size(16) /* IFA_LOCAL */
4979 + nla_total_size(16) /* IFA_ADDRESS */
4980 + nla_total_size(sizeof(struct ifa_cacheinfo))
4981 + nla_total_size(4) /* IFA_FLAGS */
4982 + nla_total_size(1) /* IFA_PROTO */
4983 + nla_total_size(4) /* IFA_RT_PRIORITY */;
4992 struct inet6_fill_args {
4999 enum addr_type_t type;
5002 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
5003 struct inet6_fill_args *args)
5005 struct nlmsghdr *nlh;
5006 u32 preferred, valid;
5008 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5009 sizeof(struct ifaddrmsg), args->flags);
5013 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
5014 ifa->idev->dev->ifindex);
5016 if (args->netnsid >= 0 &&
5017 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
5020 spin_lock_bh(&ifa->lock);
5021 if (!((ifa->flags&IFA_F_PERMANENT) &&
5022 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
5023 preferred = ifa->prefered_lft;
5024 valid = ifa->valid_lft;
5025 if (preferred != INFINITY_LIFE_TIME) {
5026 long tval = (jiffies - ifa->tstamp)/HZ;
5027 if (preferred > tval)
5031 if (valid != INFINITY_LIFE_TIME) {
5039 preferred = INFINITY_LIFE_TIME;
5040 valid = INFINITY_LIFE_TIME;
5042 spin_unlock_bh(&ifa->lock);
5044 if (!ipv6_addr_any(&ifa->peer_addr)) {
5045 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
5046 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
5049 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
5052 if (ifa->rt_priority &&
5053 nla_put_u32(skb, IFA_RT_PRIORITY, ifa->rt_priority))
5056 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
5059 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
5062 if (ifa->ifa_proto &&
5063 nla_put_u8(skb, IFA_PROTO, ifa->ifa_proto))
5066 nlmsg_end(skb, nlh);
5070 nlmsg_cancel(skb, nlh);
5074 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
5075 struct inet6_fill_args *args)
5077 struct nlmsghdr *nlh;
5078 u8 scope = RT_SCOPE_UNIVERSE;
5079 int ifindex = ifmca->idev->dev->ifindex;
5081 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
5082 scope = RT_SCOPE_SITE;
5084 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5085 sizeof(struct ifaddrmsg), args->flags);
5089 if (args->netnsid >= 0 &&
5090 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) {
5091 nlmsg_cancel(skb, nlh);
5095 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
5096 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
5097 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
5098 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
5099 nlmsg_cancel(skb, nlh);
5103 nlmsg_end(skb, nlh);
5107 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
5108 struct inet6_fill_args *args)
5110 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt);
5111 int ifindex = dev ? dev->ifindex : 1;
5112 struct nlmsghdr *nlh;
5113 u8 scope = RT_SCOPE_UNIVERSE;
5115 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
5116 scope = RT_SCOPE_SITE;
5118 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5119 sizeof(struct ifaddrmsg), args->flags);
5123 if (args->netnsid >= 0 &&
5124 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) {
5125 nlmsg_cancel(skb, nlh);
5129 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
5130 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
5131 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
5132 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
5133 nlmsg_cancel(skb, nlh);
5137 nlmsg_end(skb, nlh);
5141 /* called with rcu_read_lock() */
5142 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
5143 struct netlink_callback *cb, int s_ip_idx,
5144 struct inet6_fill_args *fillargs)
5146 struct ifmcaddr6 *ifmca;
5147 struct ifacaddr6 *ifaca;
5151 read_lock_bh(&idev->lock);
5152 switch (fillargs->type) {
5153 case UNICAST_ADDR: {
5154 struct inet6_ifaddr *ifa;
5155 fillargs->event = RTM_NEWADDR;
5157 /* unicast address incl. temp addr */
5158 list_for_each_entry(ifa, &idev->addr_list, if_list) {
5159 if (ip_idx < s_ip_idx)
5161 err = inet6_fill_ifaddr(skb, ifa, fillargs);
5164 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
5170 case MULTICAST_ADDR:
5171 read_unlock_bh(&idev->lock);
5172 fillargs->event = RTM_GETMULTICAST;
5174 /* multicast address */
5175 for (ifmca = rcu_dereference(idev->mc_list);
5177 ifmca = rcu_dereference(ifmca->next), ip_idx++) {
5178 if (ip_idx < s_ip_idx)
5180 err = inet6_fill_ifmcaddr(skb, ifmca, fillargs);
5184 read_lock_bh(&idev->lock);
5187 fillargs->event = RTM_GETANYCAST;
5188 /* anycast address */
5189 for (ifaca = idev->ac_list; ifaca;
5190 ifaca = ifaca->aca_next, ip_idx++) {
5191 if (ip_idx < s_ip_idx)
5193 err = inet6_fill_ifacaddr(skb, ifaca, fillargs);
5201 read_unlock_bh(&idev->lock);
5202 cb->args[2] = ip_idx;
5206 static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh,
5207 struct inet6_fill_args *fillargs,
5208 struct net **tgt_net, struct sock *sk,
5209 struct netlink_callback *cb)
5211 struct netlink_ext_ack *extack = cb->extack;
5212 struct nlattr *tb[IFA_MAX+1];
5213 struct ifaddrmsg *ifm;
5216 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5217 NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request");
5221 ifm = nlmsg_data(nlh);
5222 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5223 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request");
5227 fillargs->ifindex = ifm->ifa_index;
5228 if (fillargs->ifindex) {
5229 cb->answer_flags |= NLM_F_DUMP_FILTERED;
5230 fillargs->flags |= NLM_F_DUMP_FILTERED;
5233 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5234 ifa_ipv6_policy, extack);
5238 for (i = 0; i <= IFA_MAX; ++i) {
5242 if (i == IFA_TARGET_NETNSID) {
5245 fillargs->netnsid = nla_get_s32(tb[i]);
5246 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid);
5248 fillargs->netnsid = -1;
5249 NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id");
5250 return PTR_ERR(net);
5254 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request");
5262 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
5263 enum addr_type_t type)
5265 const struct nlmsghdr *nlh = cb->nlh;
5266 struct inet6_fill_args fillargs = {
5267 .portid = NETLINK_CB(cb->skb).portid,
5268 .seq = cb->nlh->nlmsg_seq,
5269 .flags = NLM_F_MULTI,
5273 struct net *tgt_net = sock_net(skb->sk);
5274 int idx, s_idx, s_ip_idx;
5276 struct net_device *dev;
5277 struct inet6_dev *idev;
5278 struct hlist_head *head;
5282 s_idx = idx = cb->args[1];
5283 s_ip_idx = cb->args[2];
5285 if (cb->strict_check) {
5286 err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net,
5292 if (fillargs.ifindex) {
5293 dev = __dev_get_by_index(tgt_net, fillargs.ifindex);
5298 idev = __in6_dev_get(dev);
5300 err = in6_dump_addrs(idev, skb, cb, s_ip_idx,
5310 cb->seq = atomic_read(&tgt_net->ipv6.dev_addr_genid) ^ tgt_net->dev_base_seq;
5311 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5313 head = &tgt_net->dev_index_head[h];
5314 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5317 if (h > s_h || idx > s_idx)
5319 idev = __in6_dev_get(dev);
5323 if (in6_dump_addrs(idev, skb, cb, s_ip_idx,
5335 if (fillargs.netnsid >= 0)
5338 return skb->len ? : err;
5341 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
5343 enum addr_type_t type = UNICAST_ADDR;
5345 return inet6_dump_addr(skb, cb, type);
5348 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
5350 enum addr_type_t type = MULTICAST_ADDR;
5352 return inet6_dump_addr(skb, cb, type);
5356 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
5358 enum addr_type_t type = ANYCAST_ADDR;
5360 return inet6_dump_addr(skb, cb, type);
5363 static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb,
5364 const struct nlmsghdr *nlh,
5366 struct netlink_ext_ack *extack)
5368 struct ifaddrmsg *ifm;
5371 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5372 NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request");
5376 if (!netlink_strict_get_check(skb))
5377 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
5378 ifa_ipv6_policy, extack);
5380 ifm = nlmsg_data(nlh);
5381 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5382 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request");
5386 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5387 ifa_ipv6_policy, extack);
5391 for (i = 0; i <= IFA_MAX; i++) {
5396 case IFA_TARGET_NETNSID:
5401 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request");
5409 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
5410 struct netlink_ext_ack *extack)
5412 struct net *tgt_net = sock_net(in_skb->sk);
5413 struct inet6_fill_args fillargs = {
5414 .portid = NETLINK_CB(in_skb).portid,
5415 .seq = nlh->nlmsg_seq,
5416 .event = RTM_NEWADDR,
5420 struct ifaddrmsg *ifm;
5421 struct nlattr *tb[IFA_MAX+1];
5422 struct in6_addr *addr = NULL, *peer;
5423 struct net_device *dev = NULL;
5424 struct inet6_ifaddr *ifa;
5425 struct sk_buff *skb;
5428 err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack);
5432 if (tb[IFA_TARGET_NETNSID]) {
5433 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]);
5435 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk,
5437 if (IS_ERR(tgt_net))
5438 return PTR_ERR(tgt_net);
5441 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
5445 ifm = nlmsg_data(nlh);
5447 dev = dev_get_by_index(tgt_net, ifm->ifa_index);
5449 ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1);
5451 err = -EADDRNOTAVAIL;
5455 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
5461 err = inet6_fill_ifaddr(skb, ifa, &fillargs);
5463 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5464 WARN_ON(err == -EMSGSIZE);
5468 err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid);
5473 if (fillargs.netnsid >= 0)
5479 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
5481 struct sk_buff *skb;
5482 struct net *net = dev_net(ifa->idev->dev);
5483 struct inet6_fill_args fillargs = {
5492 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5496 err = inet6_fill_ifaddr(skb, ifa, &fillargs);
5498 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5499 WARN_ON(err == -EMSGSIZE);
5503 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
5507 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
5510 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
5511 __s32 *array, int bytes)
5513 BUG_ON(bytes < (DEVCONF_MAX * 4));
5515 memset(array, 0, bytes);
5516 array[DEVCONF_FORWARDING] = cnf->forwarding;
5517 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
5518 array[DEVCONF_MTU6] = cnf->mtu6;
5519 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
5520 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
5521 array[DEVCONF_AUTOCONF] = cnf->autoconf;
5522 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
5523 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
5524 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
5525 jiffies_to_msecs(cnf->rtr_solicit_interval);
5526 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
5527 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
5528 array[DEVCONF_RTR_SOLICIT_DELAY] =
5529 jiffies_to_msecs(cnf->rtr_solicit_delay);
5530 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
5531 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
5532 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
5533 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
5534 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
5535 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
5536 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
5537 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
5538 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
5539 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
5540 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
5541 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
5542 array[DEVCONF_RA_DEFRTR_METRIC] = cnf->ra_defrtr_metric;
5543 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
5544 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
5545 #ifdef CONFIG_IPV6_ROUTER_PREF
5546 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
5547 array[DEVCONF_RTR_PROBE_INTERVAL] =
5548 jiffies_to_msecs(cnf->rtr_probe_interval);
5549 #ifdef CONFIG_IPV6_ROUTE_INFO
5550 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen;
5551 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
5554 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
5555 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
5556 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5557 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
5558 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
5560 #ifdef CONFIG_IPV6_MROUTE
5561 array[DEVCONF_MC_FORWARDING] = atomic_read(&cnf->mc_forwarding);
5563 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
5564 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
5565 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5566 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
5567 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
5568 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
5569 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
5570 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
5571 /* we omit DEVCONF_STABLE_SECRET for now */
5572 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
5573 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
5574 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
5575 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
5576 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled;
5577 #ifdef CONFIG_IPV6_SEG6_HMAC
5578 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac;
5580 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad;
5581 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode;
5582 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy;
5583 array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass;
5584 array[DEVCONF_RPL_SEG_ENABLED] = cnf->rpl_seg_enabled;
5585 array[DEVCONF_IOAM6_ENABLED] = cnf->ioam6_enabled;
5586 array[DEVCONF_IOAM6_ID] = cnf->ioam6_id;
5587 array[DEVCONF_IOAM6_ID_WIDE] = cnf->ioam6_id_wide;
5588 array[DEVCONF_NDISC_EVICT_NOCARRIER] = cnf->ndisc_evict_nocarrier;
5589 array[DEVCONF_ACCEPT_UNTRACKED_NA] = cnf->accept_untracked_na;
5592 static inline size_t inet6_ifla6_size(void)
5594 return nla_total_size(4) /* IFLA_INET6_FLAGS */
5595 + nla_total_size(sizeof(struct ifla_cacheinfo))
5596 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5597 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
5598 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
5599 + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */
5600 + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */
5601 + nla_total_size(4) /* IFLA_INET6_RA_MTU */
5605 static inline size_t inet6_if_nlmsg_size(void)
5607 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5608 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5609 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5610 + nla_total_size(4) /* IFLA_MTU */
5611 + nla_total_size(4) /* IFLA_LINK */
5612 + nla_total_size(1) /* IFLA_OPERSTATE */
5613 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
5616 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
5620 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
5623 /* Use put_unaligned() because stats may not be aligned for u64. */
5624 put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5625 for (i = 1; i < ICMP6_MIB_MAX; i++)
5626 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
5628 memset(&stats[ICMP6_MIB_MAX], 0, pad);
5631 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
5632 int bytes, size_t syncpoff)
5635 u64 buff[IPSTATS_MIB_MAX];
5636 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5640 memset(buff, 0, sizeof(buff));
5641 buff[0] = IPSTATS_MIB_MAX;
5643 for_each_possible_cpu(c) {
5644 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5645 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5648 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5649 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
5652 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5656 case IFLA_INET6_STATS:
5657 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5658 offsetof(struct ipstats_mib, syncp));
5660 case IFLA_INET6_ICMP6STATS:
5661 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
5666 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5667 u32 ext_filter_mask)
5670 struct ifla_cacheinfo ci;
5672 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5673 goto nla_put_failure;
5674 ci.max_reasm_len = IPV6_MAXPLEN;
5675 ci.tstamp = cstamp_delta(idev->tstamp);
5676 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
5677 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
5678 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5679 goto nla_put_failure;
5680 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
5682 goto nla_put_failure;
5683 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5685 /* XXX - MC not implemented */
5687 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5690 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
5692 goto nla_put_failure;
5693 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5695 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
5697 goto nla_put_failure;
5698 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5700 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
5702 goto nla_put_failure;
5703 read_lock_bh(&idev->lock);
5704 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5705 read_unlock_bh(&idev->lock);
5707 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode))
5708 goto nla_put_failure;
5711 nla_put_u32(skb, IFLA_INET6_RA_MTU, idev->ra_mtu))
5712 goto nla_put_failure;
5720 static size_t inet6_get_link_af_size(const struct net_device *dev,
5721 u32 ext_filter_mask)
5723 if (!__in6_dev_get(dev))
5726 return inet6_ifla6_size();
5729 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5730 u32 ext_filter_mask)
5732 struct inet6_dev *idev = __in6_dev_get(dev);
5737 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
5743 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token,
5744 struct netlink_ext_ack *extack)
5746 struct inet6_ifaddr *ifp;
5747 struct net_device *dev = idev->dev;
5748 bool clear_token, update_rs = false;
5749 struct in6_addr ll_addr;
5756 if (dev->flags & IFF_LOOPBACK) {
5757 NL_SET_ERR_MSG_MOD(extack, "Device is loopback");
5761 if (dev->flags & IFF_NOARP) {
5762 NL_SET_ERR_MSG_MOD(extack,
5763 "Device does not do neighbour discovery");
5767 if (!ipv6_accept_ra(idev)) {
5768 NL_SET_ERR_MSG_MOD(extack,
5769 "Router advertisement is disabled on device");
5773 if (idev->cnf.rtr_solicits == 0) {
5774 NL_SET_ERR_MSG(extack,
5775 "Router solicitation is disabled on device");
5779 write_lock_bh(&idev->lock);
5781 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5782 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5784 write_unlock_bh(&idev->lock);
5786 clear_token = ipv6_addr_any(token);
5790 if (!idev->dead && (idev->if_flags & IF_READY) &&
5791 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5792 IFA_F_OPTIMISTIC)) {
5793 /* If we're not ready, then normal ifup will take care
5794 * of this. Otherwise, we need to request our rs here.
5796 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5801 write_lock_bh(&idev->lock);
5804 idev->if_flags |= IF_RS_SENT;
5805 idev->rs_interval = rfc3315_s14_backoff_init(
5806 idev->cnf.rtr_solicit_interval);
5807 idev->rs_probes = 1;
5808 addrconf_mod_rs_timer(idev, idev->rs_interval);
5811 /* Well, that's kinda nasty ... */
5812 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5813 spin_lock(&ifp->lock);
5814 if (ifp->tokenized) {
5816 ifp->prefered_lft = 0;
5818 spin_unlock(&ifp->lock);
5821 write_unlock_bh(&idev->lock);
5822 inet6_ifinfo_notify(RTM_NEWLINK, idev);
5823 addrconf_verify_rtnl(dev_net(dev));
5827 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5828 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5829 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5830 [IFLA_INET6_RA_MTU] = { .type = NLA_REJECT,
5832 "IFLA_INET6_RA_MTU can not be set" },
5835 static int check_addr_gen_mode(int mode)
5837 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5838 mode != IN6_ADDR_GEN_MODE_NONE &&
5839 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5840 mode != IN6_ADDR_GEN_MODE_RANDOM)
5845 static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5848 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5849 !idev->cnf.stable_secret.initialized &&
5850 !net->ipv6.devconf_dflt->stable_secret.initialized)
5855 static int inet6_validate_link_af(const struct net_device *dev,
5856 const struct nlattr *nla,
5857 struct netlink_ext_ack *extack)
5859 struct nlattr *tb[IFLA_INET6_MAX + 1];
5860 struct inet6_dev *idev = NULL;
5864 idev = __in6_dev_get(dev);
5866 return -EAFNOSUPPORT;
5869 err = nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla,
5870 inet6_af_policy, extack);
5874 if (!tb[IFLA_INET6_TOKEN] && !tb[IFLA_INET6_ADDR_GEN_MODE])
5877 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5878 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5880 if (check_addr_gen_mode(mode) < 0)
5882 if (dev && check_stable_privacy(idev, dev_net(dev), mode) < 0)
5889 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla,
5890 struct netlink_ext_ack *extack)
5892 struct inet6_dev *idev = __in6_dev_get(dev);
5893 struct nlattr *tb[IFLA_INET6_MAX + 1];
5897 return -EAFNOSUPPORT;
5899 if (nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0)
5902 if (tb[IFLA_INET6_TOKEN]) {
5903 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]),
5909 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5910 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5912 idev->cnf.addr_gen_mode = mode;
5918 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
5919 u32 portid, u32 seq, int event, unsigned int flags)
5921 struct net_device *dev = idev->dev;
5922 struct ifinfomsg *hdr;
5923 struct nlmsghdr *nlh;
5926 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
5930 hdr = nlmsg_data(nlh);
5931 hdr->ifi_family = AF_INET6;
5933 hdr->ifi_type = dev->type;
5934 hdr->ifi_index = dev->ifindex;
5935 hdr->ifi_flags = dev_get_flags(dev);
5936 hdr->ifi_change = 0;
5938 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5940 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5941 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
5942 (dev->ifindex != dev_get_iflink(dev) &&
5943 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5944 nla_put_u8(skb, IFLA_OPERSTATE,
5945 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
5946 goto nla_put_failure;
5947 protoinfo = nla_nest_start_noflag(skb, IFLA_PROTINFO);
5949 goto nla_put_failure;
5951 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
5952 goto nla_put_failure;
5954 nla_nest_end(skb, protoinfo);
5955 nlmsg_end(skb, nlh);
5959 nlmsg_cancel(skb, nlh);
5963 static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh,
5964 struct netlink_ext_ack *extack)
5966 struct ifinfomsg *ifm;
5968 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5969 NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request");
5973 if (nlmsg_attrlen(nlh, sizeof(*ifm))) {
5974 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header");
5978 ifm = nlmsg_data(nlh);
5979 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
5980 ifm->ifi_change || ifm->ifi_index) {
5981 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request");
5988 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5990 struct net *net = sock_net(skb->sk);
5993 struct net_device *dev;
5994 struct inet6_dev *idev;
5995 struct hlist_head *head;
5997 /* only requests using strict checking can pass data to
5998 * influence the dump
6000 if (cb->strict_check) {
6001 int err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack);
6008 s_idx = cb->args[1];
6011 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
6013 head = &net->dev_index_head[h];
6014 hlist_for_each_entry_rcu(dev, head, index_hlist) {
6017 idev = __in6_dev_get(dev);
6020 if (inet6_fill_ifinfo(skb, idev,
6021 NETLINK_CB(cb->skb).portid,
6023 RTM_NEWLINK, NLM_F_MULTI) < 0)
6037 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
6039 struct sk_buff *skb;
6040 struct net *net = dev_net(idev->dev);
6043 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
6047 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
6049 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
6050 WARN_ON(err == -EMSGSIZE);
6054 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
6058 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
6061 static inline size_t inet6_prefix_nlmsg_size(void)
6063 return NLMSG_ALIGN(sizeof(struct prefixmsg))
6064 + nla_total_size(sizeof(struct in6_addr))
6065 + nla_total_size(sizeof(struct prefix_cacheinfo));
6068 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
6069 struct prefix_info *pinfo, u32 portid, u32 seq,
6070 int event, unsigned int flags)
6072 struct prefixmsg *pmsg;
6073 struct nlmsghdr *nlh;
6074 struct prefix_cacheinfo ci;
6076 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
6080 pmsg = nlmsg_data(nlh);
6081 pmsg->prefix_family = AF_INET6;
6082 pmsg->prefix_pad1 = 0;
6083 pmsg->prefix_pad2 = 0;
6084 pmsg->prefix_ifindex = idev->dev->ifindex;
6085 pmsg->prefix_len = pinfo->prefix_len;
6086 pmsg->prefix_type = pinfo->type;
6087 pmsg->prefix_pad3 = 0;
6088 pmsg->prefix_flags = 0;
6090 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
6091 if (pinfo->autoconf)
6092 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
6094 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
6095 goto nla_put_failure;
6096 ci.preferred_time = ntohl(pinfo->prefered);
6097 ci.valid_time = ntohl(pinfo->valid);
6098 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
6099 goto nla_put_failure;
6100 nlmsg_end(skb, nlh);
6104 nlmsg_cancel(skb, nlh);
6108 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
6109 struct prefix_info *pinfo)
6111 struct sk_buff *skb;
6112 struct net *net = dev_net(idev->dev);
6115 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
6119 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
6121 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
6122 WARN_ON(err == -EMSGSIZE);
6126 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
6130 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
6133 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
6135 struct net *net = dev_net(ifp->idev->dev);
6140 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
6145 * If the address was optimistic we inserted the route at the
6146 * start of our DAD process, so we don't need to do it again.
6147 * If the device was taken down in the middle of the DAD
6148 * cycle there is a race where we could get here without a
6149 * host route, so nothing to insert. That will be fixed when
6150 * the device is brought up.
6152 if (ifp->rt && !rcu_access_pointer(ifp->rt->fib6_node)) {
6153 ip6_ins_rt(net, ifp->rt);
6154 } else if (!ifp->rt && (ifp->idev->dev->flags & IFF_UP)) {
6155 pr_warn("BUG: Address %pI6c on device %s is missing its host route.\n",
6156 &ifp->addr, ifp->idev->dev->name);
6159 if (ifp->idev->cnf.forwarding)
6160 addrconf_join_anycast(ifp);
6161 if (!ipv6_addr_any(&ifp->peer_addr))
6162 addrconf_prefix_route(&ifp->peer_addr, 128,
6163 ifp->rt_priority, ifp->idev->dev,
6167 if (ifp->idev->cnf.forwarding)
6168 addrconf_leave_anycast(ifp);
6169 addrconf_leave_solict(ifp->idev, &ifp->addr);
6170 if (!ipv6_addr_any(&ifp->peer_addr)) {
6171 struct fib6_info *rt;
6173 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
6174 ifp->idev->dev, 0, 0,
6177 ip6_del_rt(net, rt, false);
6180 ip6_del_rt(net, ifp->rt, false);
6183 rt_genid_bump_ipv6(net);
6186 atomic_inc(&net->ipv6.dev_addr_genid);
6189 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
6191 if (likely(ifp->idev->dead == 0))
6192 __ipv6_ifa_notify(event, ifp);
6195 #ifdef CONFIG_SYSCTL
6197 static int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
6198 void *buffer, size_t *lenp, loff_t *ppos)
6200 int *valp = ctl->data;
6203 struct ctl_table lctl;
6207 * ctl->data points to idev->cnf.forwarding, we should
6208 * not modify it until we get the rtnl lock.
6213 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6216 ret = addrconf_fixup_forwarding(ctl, valp, val);
6222 static int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
6223 void *buffer, size_t *lenp, loff_t *ppos)
6225 struct inet6_dev *idev = ctl->extra1;
6226 int min_mtu = IPV6_MIN_MTU;
6227 struct ctl_table lctl;
6230 lctl.extra1 = &min_mtu;
6231 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
6233 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
6236 static void dev_disable_change(struct inet6_dev *idev)
6238 struct netdev_notifier_info info;
6240 if (!idev || !idev->dev)
6243 netdev_notifier_info_init(&info, idev->dev);
6244 if (idev->cnf.disable_ipv6)
6245 addrconf_notify(NULL, NETDEV_DOWN, &info);
6247 addrconf_notify(NULL, NETDEV_UP, &info);
6250 static void addrconf_disable_change(struct net *net, __s32 newf)
6252 struct net_device *dev;
6253 struct inet6_dev *idev;
6255 for_each_netdev(net, dev) {
6256 idev = __in6_dev_get(dev);
6258 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
6259 idev->cnf.disable_ipv6 = newf;
6261 dev_disable_change(idev);
6266 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
6271 if (!rtnl_trylock())
6272 return restart_syscall();
6274 net = (struct net *)table->extra2;
6278 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
6283 if (p == &net->ipv6.devconf_all->disable_ipv6) {
6284 net->ipv6.devconf_dflt->disable_ipv6 = newf;
6285 addrconf_disable_change(net, newf);
6286 } else if ((!newf) ^ (!old))
6287 dev_disable_change((struct inet6_dev *)table->extra1);
6293 static int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
6294 void *buffer, size_t *lenp, loff_t *ppos)
6296 int *valp = ctl->data;
6299 struct ctl_table lctl;
6303 * ctl->data points to idev->cnf.disable_ipv6, we should
6304 * not modify it until we get the rtnl lock.
6309 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6312 ret = addrconf_disable_ipv6(ctl, valp, val);
6318 static int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
6319 void *buffer, size_t *lenp, loff_t *ppos)
6321 int *valp = ctl->data;
6326 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
6329 if (write && old != new) {
6330 struct net *net = ctl->extra2;
6332 if (!rtnl_trylock())
6333 return restart_syscall();
6335 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
6336 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6337 NETCONFA_PROXY_NEIGH,
6338 NETCONFA_IFINDEX_DEFAULT,
6339 net->ipv6.devconf_dflt);
6340 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
6341 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6342 NETCONFA_PROXY_NEIGH,
6343 NETCONFA_IFINDEX_ALL,
6344 net->ipv6.devconf_all);
6346 struct inet6_dev *idev = ctl->extra1;
6348 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6349 NETCONFA_PROXY_NEIGH,
6359 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
6360 void *buffer, size_t *lenp,
6365 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
6366 struct net *net = (struct net *)ctl->extra2;
6367 struct ctl_table tmp = {
6369 .maxlen = sizeof(new_val),
6373 if (!rtnl_trylock())
6374 return restart_syscall();
6376 new_val = *((u32 *)ctl->data);
6378 ret = proc_douintvec(&tmp, write, buffer, lenp, ppos);
6383 if (check_addr_gen_mode(new_val) < 0) {
6389 if (check_stable_privacy(idev, net, new_val) < 0) {
6394 if (idev->cnf.addr_gen_mode != new_val) {
6395 idev->cnf.addr_gen_mode = new_val;
6396 addrconf_dev_config(idev->dev);
6398 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) {
6399 struct net_device *dev;
6401 net->ipv6.devconf_dflt->addr_gen_mode = new_val;
6402 for_each_netdev(net, dev) {
6403 idev = __in6_dev_get(dev);
6405 idev->cnf.addr_gen_mode != new_val) {
6406 idev->cnf.addr_gen_mode = new_val;
6407 addrconf_dev_config(idev->dev);
6412 *((u32 *)ctl->data) = new_val;
6421 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
6422 void *buffer, size_t *lenp,
6426 struct in6_addr addr;
6427 char str[IPV6_MAX_STRLEN];
6428 struct ctl_table lctl = *ctl;
6429 struct net *net = ctl->extra2;
6430 struct ipv6_stable_secret *secret = ctl->data;
6432 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
6435 lctl.maxlen = IPV6_MAX_STRLEN;
6438 if (!rtnl_trylock())
6439 return restart_syscall();
6441 if (!write && !secret->initialized) {
6446 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
6447 if (err >= sizeof(str)) {
6452 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
6456 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
6461 secret->initialized = true;
6462 secret->secret = addr;
6464 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
6465 struct net_device *dev;
6467 for_each_netdev(net, dev) {
6468 struct inet6_dev *idev = __in6_dev_get(dev);
6471 idev->cnf.addr_gen_mode =
6472 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
6476 struct inet6_dev *idev = ctl->extra1;
6478 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
6488 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
6489 int write, void *buffer,
6493 int *valp = ctl->data;
6496 struct ctl_table lctl;
6499 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
6500 * we should not modify it until we get the rtnl lock.
6505 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6508 ret = addrconf_fixup_linkdown(ctl, valp, val);
6515 void addrconf_set_nopolicy(struct rt6_info *rt, int action)
6519 rt->dst.flags |= DST_NOPOLICY;
6521 rt->dst.flags &= ~DST_NOPOLICY;
6526 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
6528 struct inet6_ifaddr *ifa;
6530 read_lock_bh(&idev->lock);
6531 list_for_each_entry(ifa, &idev->addr_list, if_list) {
6532 spin_lock(&ifa->lock);
6534 /* host routes only use builtin fib6_nh */
6535 struct fib6_nh *nh = ifa->rt->fib6_nh;
6539 ifa->rt->dst_nopolicy = val ? true : false;
6540 if (nh->rt6i_pcpu) {
6541 for_each_possible_cpu(cpu) {
6542 struct rt6_info **rtp;
6544 rtp = per_cpu_ptr(nh->rt6i_pcpu, cpu);
6545 addrconf_set_nopolicy(*rtp, val);
6550 spin_unlock(&ifa->lock);
6552 read_unlock_bh(&idev->lock);
6556 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val)
6558 struct inet6_dev *idev;
6561 if (!rtnl_trylock())
6562 return restart_syscall();
6566 net = (struct net *)ctl->extra2;
6567 if (valp == &net->ipv6.devconf_dflt->disable_policy) {
6572 if (valp == &net->ipv6.devconf_all->disable_policy) {
6573 struct net_device *dev;
6575 for_each_netdev(net, dev) {
6576 idev = __in6_dev_get(dev);
6578 addrconf_disable_policy_idev(idev, val);
6581 idev = (struct inet6_dev *)ctl->extra1;
6582 addrconf_disable_policy_idev(idev, val);
6589 static int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write,
6590 void *buffer, size_t *lenp, loff_t *ppos)
6592 int *valp = ctl->data;
6595 struct ctl_table lctl;
6600 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6602 if (write && (*valp != val))
6603 ret = addrconf_disable_policy(ctl, valp, val);
6611 static int minus_one = -1;
6612 static const int two_five_five = 255;
6613 static u32 ioam6_if_id_max = U16_MAX;
6615 static const struct ctl_table addrconf_sysctl[] = {
6617 .procname = "forwarding",
6618 .data = &ipv6_devconf.forwarding,
6619 .maxlen = sizeof(int),
6621 .proc_handler = addrconf_sysctl_forward,
6624 .procname = "hop_limit",
6625 .data = &ipv6_devconf.hop_limit,
6626 .maxlen = sizeof(int),
6628 .proc_handler = proc_dointvec_minmax,
6629 .extra1 = (void *)SYSCTL_ONE,
6630 .extra2 = (void *)&two_five_five,
6634 .data = &ipv6_devconf.mtu6,
6635 .maxlen = sizeof(int),
6637 .proc_handler = addrconf_sysctl_mtu,
6640 .procname = "accept_ra",
6641 .data = &ipv6_devconf.accept_ra,
6642 .maxlen = sizeof(int),
6644 .proc_handler = proc_dointvec,
6647 .procname = "accept_redirects",
6648 .data = &ipv6_devconf.accept_redirects,
6649 .maxlen = sizeof(int),
6651 .proc_handler = proc_dointvec,
6654 .procname = "autoconf",
6655 .data = &ipv6_devconf.autoconf,
6656 .maxlen = sizeof(int),
6658 .proc_handler = proc_dointvec,
6661 .procname = "dad_transmits",
6662 .data = &ipv6_devconf.dad_transmits,
6663 .maxlen = sizeof(int),
6665 .proc_handler = proc_dointvec,
6668 .procname = "router_solicitations",
6669 .data = &ipv6_devconf.rtr_solicits,
6670 .maxlen = sizeof(int),
6672 .proc_handler = proc_dointvec_minmax,
6673 .extra1 = &minus_one,
6676 .procname = "router_solicitation_interval",
6677 .data = &ipv6_devconf.rtr_solicit_interval,
6678 .maxlen = sizeof(int),
6680 .proc_handler = proc_dointvec_jiffies,
6683 .procname = "router_solicitation_max_interval",
6684 .data = &ipv6_devconf.rtr_solicit_max_interval,
6685 .maxlen = sizeof(int),
6687 .proc_handler = proc_dointvec_jiffies,
6690 .procname = "router_solicitation_delay",
6691 .data = &ipv6_devconf.rtr_solicit_delay,
6692 .maxlen = sizeof(int),
6694 .proc_handler = proc_dointvec_jiffies,
6697 .procname = "force_mld_version",
6698 .data = &ipv6_devconf.force_mld_version,
6699 .maxlen = sizeof(int),
6701 .proc_handler = proc_dointvec,
6704 .procname = "mldv1_unsolicited_report_interval",
6706 &ipv6_devconf.mldv1_unsolicited_report_interval,
6707 .maxlen = sizeof(int),
6709 .proc_handler = proc_dointvec_ms_jiffies,
6712 .procname = "mldv2_unsolicited_report_interval",
6714 &ipv6_devconf.mldv2_unsolicited_report_interval,
6715 .maxlen = sizeof(int),
6717 .proc_handler = proc_dointvec_ms_jiffies,
6720 .procname = "use_tempaddr",
6721 .data = &ipv6_devconf.use_tempaddr,
6722 .maxlen = sizeof(int),
6724 .proc_handler = proc_dointvec,
6727 .procname = "temp_valid_lft",
6728 .data = &ipv6_devconf.temp_valid_lft,
6729 .maxlen = sizeof(int),
6731 .proc_handler = proc_dointvec,
6734 .procname = "temp_prefered_lft",
6735 .data = &ipv6_devconf.temp_prefered_lft,
6736 .maxlen = sizeof(int),
6738 .proc_handler = proc_dointvec,
6741 .procname = "regen_max_retry",
6742 .data = &ipv6_devconf.regen_max_retry,
6743 .maxlen = sizeof(int),
6745 .proc_handler = proc_dointvec,
6748 .procname = "max_desync_factor",
6749 .data = &ipv6_devconf.max_desync_factor,
6750 .maxlen = sizeof(int),
6752 .proc_handler = proc_dointvec,
6755 .procname = "max_addresses",
6756 .data = &ipv6_devconf.max_addresses,
6757 .maxlen = sizeof(int),
6759 .proc_handler = proc_dointvec,
6762 .procname = "accept_ra_defrtr",
6763 .data = &ipv6_devconf.accept_ra_defrtr,
6764 .maxlen = sizeof(int),
6766 .proc_handler = proc_dointvec,
6769 .procname = "ra_defrtr_metric",
6770 .data = &ipv6_devconf.ra_defrtr_metric,
6771 .maxlen = sizeof(u32),
6773 .proc_handler = proc_douintvec_minmax,
6774 .extra1 = (void *)SYSCTL_ONE,
6777 .procname = "accept_ra_min_hop_limit",
6778 .data = &ipv6_devconf.accept_ra_min_hop_limit,
6779 .maxlen = sizeof(int),
6781 .proc_handler = proc_dointvec,
6784 .procname = "accept_ra_pinfo",
6785 .data = &ipv6_devconf.accept_ra_pinfo,
6786 .maxlen = sizeof(int),
6788 .proc_handler = proc_dointvec,
6790 #ifdef CONFIG_IPV6_ROUTER_PREF
6792 .procname = "accept_ra_rtr_pref",
6793 .data = &ipv6_devconf.accept_ra_rtr_pref,
6794 .maxlen = sizeof(int),
6796 .proc_handler = proc_dointvec,
6799 .procname = "router_probe_interval",
6800 .data = &ipv6_devconf.rtr_probe_interval,
6801 .maxlen = sizeof(int),
6803 .proc_handler = proc_dointvec_jiffies,
6805 #ifdef CONFIG_IPV6_ROUTE_INFO
6807 .procname = "accept_ra_rt_info_min_plen",
6808 .data = &ipv6_devconf.accept_ra_rt_info_min_plen,
6809 .maxlen = sizeof(int),
6811 .proc_handler = proc_dointvec,
6814 .procname = "accept_ra_rt_info_max_plen",
6815 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
6816 .maxlen = sizeof(int),
6818 .proc_handler = proc_dointvec,
6823 .procname = "proxy_ndp",
6824 .data = &ipv6_devconf.proxy_ndp,
6825 .maxlen = sizeof(int),
6827 .proc_handler = addrconf_sysctl_proxy_ndp,
6830 .procname = "accept_source_route",
6831 .data = &ipv6_devconf.accept_source_route,
6832 .maxlen = sizeof(int),
6834 .proc_handler = proc_dointvec,
6836 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
6838 .procname = "optimistic_dad",
6839 .data = &ipv6_devconf.optimistic_dad,
6840 .maxlen = sizeof(int),
6842 .proc_handler = proc_dointvec,
6845 .procname = "use_optimistic",
6846 .data = &ipv6_devconf.use_optimistic,
6847 .maxlen = sizeof(int),
6849 .proc_handler = proc_dointvec,
6852 #ifdef CONFIG_IPV6_MROUTE
6854 .procname = "mc_forwarding",
6855 .data = &ipv6_devconf.mc_forwarding,
6856 .maxlen = sizeof(int),
6858 .proc_handler = proc_dointvec,
6862 .procname = "disable_ipv6",
6863 .data = &ipv6_devconf.disable_ipv6,
6864 .maxlen = sizeof(int),
6866 .proc_handler = addrconf_sysctl_disable,
6869 .procname = "accept_dad",
6870 .data = &ipv6_devconf.accept_dad,
6871 .maxlen = sizeof(int),
6873 .proc_handler = proc_dointvec,
6876 .procname = "force_tllao",
6877 .data = &ipv6_devconf.force_tllao,
6878 .maxlen = sizeof(int),
6880 .proc_handler = proc_dointvec
6883 .procname = "ndisc_notify",
6884 .data = &ipv6_devconf.ndisc_notify,
6885 .maxlen = sizeof(int),
6887 .proc_handler = proc_dointvec
6890 .procname = "suppress_frag_ndisc",
6891 .data = &ipv6_devconf.suppress_frag_ndisc,
6892 .maxlen = sizeof(int),
6894 .proc_handler = proc_dointvec
6897 .procname = "accept_ra_from_local",
6898 .data = &ipv6_devconf.accept_ra_from_local,
6899 .maxlen = sizeof(int),
6901 .proc_handler = proc_dointvec,
6904 .procname = "accept_ra_mtu",
6905 .data = &ipv6_devconf.accept_ra_mtu,
6906 .maxlen = sizeof(int),
6908 .proc_handler = proc_dointvec,
6911 .procname = "stable_secret",
6912 .data = &ipv6_devconf.stable_secret,
6913 .maxlen = IPV6_MAX_STRLEN,
6915 .proc_handler = addrconf_sysctl_stable_secret,
6918 .procname = "use_oif_addrs_only",
6919 .data = &ipv6_devconf.use_oif_addrs_only,
6920 .maxlen = sizeof(int),
6922 .proc_handler = proc_dointvec,
6925 .procname = "ignore_routes_with_linkdown",
6926 .data = &ipv6_devconf.ignore_routes_with_linkdown,
6927 .maxlen = sizeof(int),
6929 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
6932 .procname = "drop_unicast_in_l2_multicast",
6933 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
6934 .maxlen = sizeof(int),
6936 .proc_handler = proc_dointvec,
6939 .procname = "drop_unsolicited_na",
6940 .data = &ipv6_devconf.drop_unsolicited_na,
6941 .maxlen = sizeof(int),
6943 .proc_handler = proc_dointvec,
6946 .procname = "keep_addr_on_down",
6947 .data = &ipv6_devconf.keep_addr_on_down,
6948 .maxlen = sizeof(int),
6950 .proc_handler = proc_dointvec,
6954 .procname = "seg6_enabled",
6955 .data = &ipv6_devconf.seg6_enabled,
6956 .maxlen = sizeof(int),
6958 .proc_handler = proc_dointvec,
6960 #ifdef CONFIG_IPV6_SEG6_HMAC
6962 .procname = "seg6_require_hmac",
6963 .data = &ipv6_devconf.seg6_require_hmac,
6964 .maxlen = sizeof(int),
6966 .proc_handler = proc_dointvec,
6970 .procname = "enhanced_dad",
6971 .data = &ipv6_devconf.enhanced_dad,
6972 .maxlen = sizeof(int),
6974 .proc_handler = proc_dointvec,
6977 .procname = "addr_gen_mode",
6978 .data = &ipv6_devconf.addr_gen_mode,
6979 .maxlen = sizeof(int),
6981 .proc_handler = addrconf_sysctl_addr_gen_mode,
6984 .procname = "disable_policy",
6985 .data = &ipv6_devconf.disable_policy,
6986 .maxlen = sizeof(int),
6988 .proc_handler = addrconf_sysctl_disable_policy,
6991 .procname = "ndisc_tclass",
6992 .data = &ipv6_devconf.ndisc_tclass,
6993 .maxlen = sizeof(int),
6995 .proc_handler = proc_dointvec_minmax,
6996 .extra1 = (void *)SYSCTL_ZERO,
6997 .extra2 = (void *)&two_five_five,
7000 .procname = "rpl_seg_enabled",
7001 .data = &ipv6_devconf.rpl_seg_enabled,
7002 .maxlen = sizeof(int),
7004 .proc_handler = proc_dointvec,
7007 .procname = "ioam6_enabled",
7008 .data = &ipv6_devconf.ioam6_enabled,
7009 .maxlen = sizeof(u8),
7011 .proc_handler = proc_dou8vec_minmax,
7012 .extra1 = (void *)SYSCTL_ZERO,
7013 .extra2 = (void *)SYSCTL_ONE,
7016 .procname = "ioam6_id",
7017 .data = &ipv6_devconf.ioam6_id,
7018 .maxlen = sizeof(u32),
7020 .proc_handler = proc_douintvec_minmax,
7021 .extra1 = (void *)SYSCTL_ZERO,
7022 .extra2 = (void *)&ioam6_if_id_max,
7025 .procname = "ioam6_id_wide",
7026 .data = &ipv6_devconf.ioam6_id_wide,
7027 .maxlen = sizeof(u32),
7029 .proc_handler = proc_douintvec,
7032 .procname = "ndisc_evict_nocarrier",
7033 .data = &ipv6_devconf.ndisc_evict_nocarrier,
7034 .maxlen = sizeof(u8),
7036 .proc_handler = proc_dou8vec_minmax,
7037 .extra1 = (void *)SYSCTL_ZERO,
7038 .extra2 = (void *)SYSCTL_ONE,
7041 .procname = "accept_untracked_na",
7042 .data = &ipv6_devconf.accept_untracked_na,
7043 .maxlen = sizeof(int),
7045 .proc_handler = proc_dointvec_minmax,
7046 .extra1 = (void *)SYSCTL_ZERO,
7047 .extra2 = (void *)SYSCTL_ONE,
7054 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
7055 struct inet6_dev *idev, struct ipv6_devconf *p)
7058 struct ctl_table *table;
7059 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
7061 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL_ACCOUNT);
7065 for (i = 0; table[i].data; i++) {
7066 table[i].data += (char *)p - (char *)&ipv6_devconf;
7067 /* If one of these is already set, then it is not safe to
7068 * overwrite either of them: this makes proc_dointvec_minmax
7071 if (!table[i].extra1 && !table[i].extra2) {
7072 table[i].extra1 = idev; /* embedded; no ref */
7073 table[i].extra2 = net;
7077 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
7079 p->sysctl_header = register_net_sysctl(net, path, table);
7080 if (!p->sysctl_header)
7083 if (!strcmp(dev_name, "all"))
7084 ifindex = NETCONFA_IFINDEX_ALL;
7085 else if (!strcmp(dev_name, "default"))
7086 ifindex = NETCONFA_IFINDEX_DEFAULT;
7088 ifindex = idev->dev->ifindex;
7089 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
7099 static void __addrconf_sysctl_unregister(struct net *net,
7100 struct ipv6_devconf *p, int ifindex)
7102 struct ctl_table *table;
7104 if (!p->sysctl_header)
7107 table = p->sysctl_header->ctl_table_arg;
7108 unregister_net_sysctl_table(p->sysctl_header);
7109 p->sysctl_header = NULL;
7112 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
7115 static int addrconf_sysctl_register(struct inet6_dev *idev)
7119 if (!sysctl_dev_name_is_allowed(idev->dev->name))
7122 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
7123 &ndisc_ifinfo_sysctl_change);
7126 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
7129 neigh_sysctl_unregister(idev->nd_parms);
7134 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
7136 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf,
7137 idev->dev->ifindex);
7138 neigh_sysctl_unregister(idev->nd_parms);
7144 static int __net_init addrconf_init_net(struct net *net)
7147 struct ipv6_devconf *all, *dflt;
7149 spin_lock_init(&net->ipv6.addrconf_hash_lock);
7150 INIT_DEFERRABLE_WORK(&net->ipv6.addr_chk_work, addrconf_verify_work);
7151 net->ipv6.inet6_addr_lst = kcalloc(IN6_ADDR_HSIZE,
7152 sizeof(struct hlist_head),
7154 if (!net->ipv6.inet6_addr_lst)
7155 goto err_alloc_addr;
7157 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
7161 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
7163 goto err_alloc_dflt;
7165 if (IS_ENABLED(CONFIG_SYSCTL) &&
7166 !net_eq(net, &init_net)) {
7167 switch (sysctl_devconf_inherit_init_net) {
7168 case 1: /* copy from init_net */
7169 memcpy(all, init_net.ipv6.devconf_all,
7170 sizeof(ipv6_devconf));
7171 memcpy(dflt, init_net.ipv6.devconf_dflt,
7172 sizeof(ipv6_devconf_dflt));
7174 case 3: /* copy from the current netns */
7175 memcpy(all, current->nsproxy->net_ns->ipv6.devconf_all,
7176 sizeof(ipv6_devconf));
7178 current->nsproxy->net_ns->ipv6.devconf_dflt,
7179 sizeof(ipv6_devconf_dflt));
7183 /* use compiled values */
7188 /* these will be inherited by all namespaces */
7189 dflt->autoconf = ipv6_defaults.autoconf;
7190 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
7192 dflt->stable_secret.initialized = false;
7193 all->stable_secret.initialized = false;
7195 net->ipv6.devconf_all = all;
7196 net->ipv6.devconf_dflt = dflt;
7198 #ifdef CONFIG_SYSCTL
7199 err = __addrconf_sysctl_register(net, "all", NULL, all);
7203 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
7209 #ifdef CONFIG_SYSCTL
7211 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
7218 kfree(net->ipv6.inet6_addr_lst);
7223 static void __net_exit addrconf_exit_net(struct net *net)
7227 #ifdef CONFIG_SYSCTL
7228 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt,
7229 NETCONFA_IFINDEX_DEFAULT);
7230 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all,
7231 NETCONFA_IFINDEX_ALL);
7233 kfree(net->ipv6.devconf_dflt);
7234 net->ipv6.devconf_dflt = NULL;
7235 kfree(net->ipv6.devconf_all);
7236 net->ipv6.devconf_all = NULL;
7238 cancel_delayed_work_sync(&net->ipv6.addr_chk_work);
7240 * Check hash table, then free it.
7242 for (i = 0; i < IN6_ADDR_HSIZE; i++)
7243 WARN_ON_ONCE(!hlist_empty(&net->ipv6.inet6_addr_lst[i]));
7245 kfree(net->ipv6.inet6_addr_lst);
7246 net->ipv6.inet6_addr_lst = NULL;
7249 static struct pernet_operations addrconf_ops = {
7250 .init = addrconf_init_net,
7251 .exit = addrconf_exit_net,
7254 static struct rtnl_af_ops inet6_ops __read_mostly = {
7256 .fill_link_af = inet6_fill_link_af,
7257 .get_link_af_size = inet6_get_link_af_size,
7258 .validate_link_af = inet6_validate_link_af,
7259 .set_link_af = inet6_set_link_af,
7263 * Init / cleanup code
7266 int __init addrconf_init(void)
7268 struct inet6_dev *idev;
7271 err = ipv6_addr_label_init();
7273 pr_crit("%s: cannot initialize default policy table: %d\n",
7278 err = register_pernet_subsys(&addrconf_ops);
7282 addrconf_wq = create_workqueue("ipv6_addrconf");
7289 idev = ipv6_add_dev(blackhole_netdev);
7292 err = PTR_ERR(idev);
7296 ip6_route_init_special_entries();
7298 register_netdevice_notifier(&ipv6_dev_notf);
7300 addrconf_verify(&init_net);
7302 rtnl_af_register(&inet6_ops);
7304 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK,
7305 NULL, inet6_dump_ifinfo, 0);
7309 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR,
7310 inet6_rtm_newaddr, NULL, 0);
7313 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR,
7314 inet6_rtm_deladdr, NULL, 0);
7317 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR,
7318 inet6_rtm_getaddr, inet6_dump_ifaddr,
7319 RTNL_FLAG_DOIT_UNLOCKED);
7322 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST,
7323 NULL, inet6_dump_ifmcaddr, 0);
7326 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST,
7327 NULL, inet6_dump_ifacaddr, 0);
7330 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF,
7331 inet6_netconf_get_devconf,
7332 inet6_netconf_dump_devconf,
7333 RTNL_FLAG_DOIT_UNLOCKED);
7336 err = ipv6_addr_label_rtnl_register();
7342 rtnl_unregister_all(PF_INET6);
7343 rtnl_af_unregister(&inet6_ops);
7344 unregister_netdevice_notifier(&ipv6_dev_notf);
7346 destroy_workqueue(addrconf_wq);
7348 unregister_pernet_subsys(&addrconf_ops);
7350 ipv6_addr_label_cleanup();
7355 void addrconf_cleanup(void)
7357 struct net_device *dev;
7359 unregister_netdevice_notifier(&ipv6_dev_notf);
7360 unregister_pernet_subsys(&addrconf_ops);
7361 ipv6_addr_label_cleanup();
7363 rtnl_af_unregister(&inet6_ops);
7367 /* clean dev list */
7368 for_each_netdev(&init_net, dev) {
7369 if (__in6_dev_get(dev) == NULL)
7371 addrconf_ifdown(dev, true);
7373 addrconf_ifdown(init_net.loopback_dev, true);
7377 destroy_workqueue(addrconf_wq);