2 * Neighbour Discovery for IPv6
3 * Linux INET6 implementation
6 * Pedro Roque <roque@di.fc.ul.pt>
7 * Mike Shaver <shaver@ingenia.com>
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
18 * Alexey I. Froloff : RFC6106 (DNSSL) support
19 * Pierre Ynard : export userland ND options
20 * through netlink (RDNSS support)
21 * Lars Fenneberg : fixed MTU setting on receipt
23 * Janos Farkas : kmalloc failure checks
24 * Alexey Kuznetsov : state machine reworked
25 * and moved to net/core.
26 * Pekka Savola : RFC2461 validation
27 * YOSHIFUJI Hideaki @USAGI : Verify ND options properly
30 #define pr_fmt(fmt) "ICMPv6: " fmt
32 #include <linux/module.h>
33 #include <linux/errno.h>
34 #include <linux/types.h>
35 #include <linux/socket.h>
36 #include <linux/sockios.h>
37 #include <linux/sched.h>
38 #include <linux/net.h>
39 #include <linux/in6.h>
40 #include <linux/route.h>
41 #include <linux/init.h>
42 #include <linux/rcupdate.h>
43 #include <linux/slab.h>
45 #include <linux/sysctl.h>
48 #include <linux/if_addr.h>
49 #include <linux/if_arp.h>
50 #include <linux/ipv6.h>
51 #include <linux/icmpv6.h>
52 #include <linux/jhash.h>
58 #include <net/protocol.h>
59 #include <net/ndisc.h>
60 #include <net/ip6_route.h>
61 #include <net/addrconf.h>
64 #include <net/netlink.h>
65 #include <linux/rtnetlink.h>
68 #include <net/ip6_checksum.h>
69 #include <net/inet_common.h>
70 #include <linux/proc_fs.h>
72 #include <linux/netfilter.h>
73 #include <linux/netfilter_ipv6.h>
75 /* Set to 3 to get tracing... */
78 #define ND_PRINTK(val, level, fmt, ...) \
80 if (val <= ND_DEBUG) \
81 net_##level##_ratelimited(fmt, ##__VA_ARGS__); \
84 static u32 ndisc_hash(const void *pkey,
85 const struct net_device *dev,
87 static int ndisc_constructor(struct neighbour *neigh);
88 static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb);
89 static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb);
90 static int pndisc_constructor(struct pneigh_entry *n);
91 static void pndisc_destructor(struct pneigh_entry *n);
92 static void pndisc_redo(struct sk_buff *skb);
94 static const struct neigh_ops ndisc_generic_ops = {
96 .solicit = ndisc_solicit,
97 .error_report = ndisc_error_report,
98 .output = neigh_resolve_output,
99 .connected_output = neigh_connected_output,
102 static const struct neigh_ops ndisc_hh_ops = {
104 .solicit = ndisc_solicit,
105 .error_report = ndisc_error_report,
106 .output = neigh_resolve_output,
107 .connected_output = neigh_resolve_output,
111 static const struct neigh_ops ndisc_direct_ops = {
113 .output = neigh_direct_output,
114 .connected_output = neigh_direct_output,
117 struct neigh_table nd_tbl = {
119 .key_len = sizeof(struct in6_addr),
121 .constructor = ndisc_constructor,
122 .pconstructor = pndisc_constructor,
123 .pdestructor = pndisc_destructor,
124 .proxy_redo = pndisc_redo,
128 .base_reachable_time = ND_REACHABLE_TIME,
129 .retrans_time = ND_RETRANS_TIMER,
130 .gc_staletime = 60 * HZ,
131 .reachable_time = ND_REACHABLE_TIME,
132 .delay_probe_time = 5 * HZ,
133 .queue_len_bytes = 64*1024,
136 .anycast_delay = 1 * HZ,
137 .proxy_delay = (8 * HZ) / 10,
140 .gc_interval = 30 * HZ,
146 static inline int ndisc_opt_addr_space(struct net_device *dev)
148 return NDISC_OPT_SPACE(dev->addr_len + ndisc_addr_option_pad(dev->type));
151 static u8 *ndisc_fill_addr_option(u8 *opt, int type, void *data, int data_len,
152 unsigned short addr_type)
154 int pad = ndisc_addr_option_pad(addr_type);
155 int space = NDISC_OPT_SPACE(data_len + pad);
160 memset(opt + 2, 0, pad);
164 memcpy(opt+2, data, data_len);
167 if ((space -= data_len) > 0)
168 memset(opt, 0, space);
172 static struct nd_opt_hdr *ndisc_next_option(struct nd_opt_hdr *cur,
173 struct nd_opt_hdr *end)
176 if (!cur || !end || cur >= end)
178 type = cur->nd_opt_type;
180 cur = ((void *)cur) + (cur->nd_opt_len << 3);
181 } while(cur < end && cur->nd_opt_type != type);
182 return cur <= end && cur->nd_opt_type == type ? cur : NULL;
185 static inline int ndisc_is_useropt(struct nd_opt_hdr *opt)
187 return opt->nd_opt_type == ND_OPT_RDNSS ||
188 opt->nd_opt_type == ND_OPT_DNSSL;
191 static struct nd_opt_hdr *ndisc_next_useropt(struct nd_opt_hdr *cur,
192 struct nd_opt_hdr *end)
194 if (!cur || !end || cur >= end)
197 cur = ((void *)cur) + (cur->nd_opt_len << 3);
198 } while(cur < end && !ndisc_is_useropt(cur));
199 return cur <= end && ndisc_is_useropt(cur) ? cur : NULL;
202 struct ndisc_options *ndisc_parse_options(u8 *opt, int opt_len,
203 struct ndisc_options *ndopts)
205 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)opt;
207 if (!nd_opt || opt_len < 0 || !ndopts)
209 memset(ndopts, 0, sizeof(*ndopts));
212 if (opt_len < sizeof(struct nd_opt_hdr))
214 l = nd_opt->nd_opt_len << 3;
215 if (opt_len < l || l == 0)
217 switch (nd_opt->nd_opt_type) {
218 case ND_OPT_SOURCE_LL_ADDR:
219 case ND_OPT_TARGET_LL_ADDR:
221 case ND_OPT_REDIRECT_HDR:
222 if (ndopts->nd_opt_array[nd_opt->nd_opt_type]) {
224 "%s: duplicated ND6 option found: type=%d\n",
225 __func__, nd_opt->nd_opt_type);
227 ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt;
230 case ND_OPT_PREFIX_INFO:
231 ndopts->nd_opts_pi_end = nd_opt;
232 if (!ndopts->nd_opt_array[nd_opt->nd_opt_type])
233 ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt;
235 #ifdef CONFIG_IPV6_ROUTE_INFO
236 case ND_OPT_ROUTE_INFO:
237 ndopts->nd_opts_ri_end = nd_opt;
238 if (!ndopts->nd_opts_ri)
239 ndopts->nd_opts_ri = nd_opt;
243 if (ndisc_is_useropt(nd_opt)) {
244 ndopts->nd_useropts_end = nd_opt;
245 if (!ndopts->nd_useropts)
246 ndopts->nd_useropts = nd_opt;
249 * Unknown options must be silently ignored,
250 * to accommodate future extension to the
254 "%s: ignored unsupported option; type=%d, len=%d\n",
261 nd_opt = ((void *)nd_opt) + l;
266 int ndisc_mc_map(const struct in6_addr *addr, char *buf, struct net_device *dev, int dir)
270 case ARPHRD_IEEE802: /* Not sure. Check it later. --ANK */
272 ipv6_eth_mc_map(addr, buf);
275 ipv6_arcnet_mc_map(addr, buf);
277 case ARPHRD_INFINIBAND:
278 ipv6_ib_mc_map(addr, dev->broadcast, buf);
281 return ipv6_ipgre_mc_map(addr, dev->broadcast, buf);
284 memcpy(buf, dev->broadcast, dev->addr_len);
291 EXPORT_SYMBOL(ndisc_mc_map);
293 static u32 ndisc_hash(const void *pkey,
294 const struct net_device *dev,
297 return ndisc_hashfn(pkey, dev, hash_rnd);
300 static int ndisc_constructor(struct neighbour *neigh)
302 struct in6_addr *addr = (struct in6_addr*)&neigh->primary_key;
303 struct net_device *dev = neigh->dev;
304 struct inet6_dev *in6_dev;
305 struct neigh_parms *parms;
306 bool is_multicast = ipv6_addr_is_multicast(addr);
308 in6_dev = in6_dev_get(dev);
309 if (in6_dev == NULL) {
313 parms = in6_dev->nd_parms;
314 __neigh_parms_put(neigh->parms);
315 neigh->parms = neigh_parms_clone(parms);
317 neigh->type = is_multicast ? RTN_MULTICAST : RTN_UNICAST;
318 if (!dev->header_ops) {
319 neigh->nud_state = NUD_NOARP;
320 neigh->ops = &ndisc_direct_ops;
321 neigh->output = neigh_direct_output;
324 neigh->nud_state = NUD_NOARP;
325 ndisc_mc_map(addr, neigh->ha, dev, 1);
326 } else if (dev->flags&(IFF_NOARP|IFF_LOOPBACK)) {
327 neigh->nud_state = NUD_NOARP;
328 memcpy(neigh->ha, dev->dev_addr, dev->addr_len);
329 if (dev->flags&IFF_LOOPBACK)
330 neigh->type = RTN_LOCAL;
331 } else if (dev->flags&IFF_POINTOPOINT) {
332 neigh->nud_state = NUD_NOARP;
333 memcpy(neigh->ha, dev->broadcast, dev->addr_len);
335 if (dev->header_ops->cache)
336 neigh->ops = &ndisc_hh_ops;
338 neigh->ops = &ndisc_generic_ops;
339 if (neigh->nud_state&NUD_VALID)
340 neigh->output = neigh->ops->connected_output;
342 neigh->output = neigh->ops->output;
344 in6_dev_put(in6_dev);
348 static int pndisc_constructor(struct pneigh_entry *n)
350 struct in6_addr *addr = (struct in6_addr*)&n->key;
351 struct in6_addr maddr;
352 struct net_device *dev = n->dev;
354 if (dev == NULL || __in6_dev_get(dev) == NULL)
356 addrconf_addr_solict_mult(addr, &maddr);
357 ipv6_dev_mc_inc(dev, &maddr);
361 static void pndisc_destructor(struct pneigh_entry *n)
363 struct in6_addr *addr = (struct in6_addr*)&n->key;
364 struct in6_addr maddr;
365 struct net_device *dev = n->dev;
367 if (dev == NULL || __in6_dev_get(dev) == NULL)
369 addrconf_addr_solict_mult(addr, &maddr);
370 ipv6_dev_mc_dec(dev, &maddr);
373 static struct sk_buff *ndisc_build_skb(struct net_device *dev,
374 const struct in6_addr *daddr,
375 const struct in6_addr *saddr,
376 struct icmp6hdr *icmp6h,
377 const struct in6_addr *target,
380 struct net *net = dev_net(dev);
381 struct sock *sk = net->ipv6.ndisc_sk;
383 struct icmp6hdr *hdr;
384 int hlen = LL_RESERVED_SPACE(dev);
385 int tlen = dev->needed_tailroom;
393 len = sizeof(struct icmp6hdr) + (target ? sizeof(*target) : 0);
395 len += ndisc_opt_addr_space(dev);
397 skb = sock_alloc_send_skb(sk,
398 (MAX_HEADER + sizeof(struct ipv6hdr) +
402 ND_PRINTK(0, err, "ND: %s failed to allocate an skb, err=%d\n",
407 skb_reserve(skb, hlen);
408 ip6_nd_hdr(sk, skb, dev, saddr, daddr, IPPROTO_ICMPV6, len);
410 skb->transport_header = skb->tail;
413 hdr = (struct icmp6hdr *)skb_transport_header(skb);
414 memcpy(hdr, icmp6h, sizeof(*hdr));
416 opt = skb_transport_header(skb) + sizeof(struct icmp6hdr);
418 *(struct in6_addr *)opt = *target;
419 opt += sizeof(*target);
423 ndisc_fill_addr_option(opt, llinfo, dev->dev_addr,
424 dev->addr_len, dev->type);
426 hdr->icmp6_cksum = csum_ipv6_magic(saddr, daddr, len,
434 static void ndisc_send_skb(struct sk_buff *skb, struct net_device *dev,
435 struct neighbour *neigh,
436 const struct in6_addr *daddr,
437 const struct in6_addr *saddr,
438 struct icmp6hdr *icmp6h)
441 struct dst_entry *dst;
442 struct net *net = dev_net(dev);
443 struct sock *sk = net->ipv6.ndisc_sk;
444 struct inet6_dev *idev;
448 type = icmp6h->icmp6_type;
450 icmpv6_flow_init(sk, &fl6, type, saddr, daddr, dev->ifindex);
451 dst = icmp6_dst_alloc(dev, neigh, &fl6);
457 skb_dst_set(skb, dst);
460 idev = __in6_dev_get(dst->dev);
461 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
463 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, dst->dev,
466 ICMP6MSGOUT_INC_STATS(net, idev, type);
467 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
474 * Send a Neighbour Discover packet
476 static void __ndisc_send(struct net_device *dev,
477 struct neighbour *neigh,
478 const struct in6_addr *daddr,
479 const struct in6_addr *saddr,
480 struct icmp6hdr *icmp6h, const struct in6_addr *target,
485 skb = ndisc_build_skb(dev, daddr, saddr, icmp6h, target, llinfo);
489 ndisc_send_skb(skb, dev, neigh, daddr, saddr, icmp6h);
492 static void ndisc_send_na(struct net_device *dev, struct neighbour *neigh,
493 const struct in6_addr *daddr,
494 const struct in6_addr *solicited_addr,
495 int router, int solicited, int override, int inc_opt)
497 struct in6_addr tmpaddr;
498 struct inet6_ifaddr *ifp;
499 const struct in6_addr *src_addr;
500 struct icmp6hdr icmp6h = {
501 .icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT,
504 /* for anycast or proxy, solicited_addr != src_addr */
505 ifp = ipv6_get_ifaddr(dev_net(dev), solicited_addr, dev, 1);
507 src_addr = solicited_addr;
508 if (ifp->flags & IFA_F_OPTIMISTIC)
510 inc_opt |= ifp->idev->cnf.force_tllao;
513 if (ipv6_dev_get_saddr(dev_net(dev), dev, daddr,
514 inet6_sk(dev_net(dev)->ipv6.ndisc_sk)->srcprefs,
520 icmp6h.icmp6_router = router;
521 icmp6h.icmp6_solicited = solicited;
522 icmp6h.icmp6_override = override;
524 __ndisc_send(dev, neigh, daddr, src_addr,
525 &icmp6h, solicited_addr,
526 inc_opt ? ND_OPT_TARGET_LL_ADDR : 0);
529 static void ndisc_send_unsol_na(struct net_device *dev)
531 struct inet6_dev *idev;
532 struct inet6_ifaddr *ifa;
534 idev = in6_dev_get(dev);
538 read_lock_bh(&idev->lock);
539 list_for_each_entry(ifa, &idev->addr_list, if_list) {
540 ndisc_send_na(dev, NULL, &in6addr_linklocal_allnodes, &ifa->addr,
541 /*router=*/ !!idev->cnf.forwarding,
542 /*solicited=*/ false, /*override=*/ true,
545 read_unlock_bh(&idev->lock);
550 void ndisc_send_ns(struct net_device *dev, struct neighbour *neigh,
551 const struct in6_addr *solicit,
552 const struct in6_addr *daddr, const struct in6_addr *saddr)
554 struct in6_addr addr_buf;
555 struct icmp6hdr icmp6h = {
556 .icmp6_type = NDISC_NEIGHBOUR_SOLICITATION,
560 if (ipv6_get_lladdr(dev, &addr_buf,
561 (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC)))
566 __ndisc_send(dev, neigh, daddr, saddr,
568 !ipv6_addr_any(saddr) ? ND_OPT_SOURCE_LL_ADDR : 0);
571 void ndisc_send_rs(struct net_device *dev, const struct in6_addr *saddr,
572 const struct in6_addr *daddr)
574 struct icmp6hdr icmp6h = {
575 .icmp6_type = NDISC_ROUTER_SOLICITATION,
577 int send_sllao = dev->addr_len;
579 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
581 * According to section 2.2 of RFC 4429, we must not
582 * send router solicitations with a sllao from
583 * optimistic addresses, but we may send the solicitation
584 * if we don't include the sllao. So here we check
585 * if our address is optimistic, and if so, we
586 * suppress the inclusion of the sllao.
589 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(dev_net(dev), saddr,
592 if (ifp->flags & IFA_F_OPTIMISTIC) {
601 __ndisc_send(dev, NULL, daddr, saddr,
603 send_sllao ? ND_OPT_SOURCE_LL_ADDR : 0);
607 static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb)
610 * "The sender MUST return an ICMP
611 * destination unreachable"
613 dst_link_failure(skb);
617 /* Called with locked neigh: either read or both */
619 static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb)
621 struct in6_addr *saddr = NULL;
622 struct in6_addr mcaddr;
623 struct net_device *dev = neigh->dev;
624 struct in6_addr *target = (struct in6_addr *)&neigh->primary_key;
625 int probes = atomic_read(&neigh->probes);
627 if (skb && ipv6_chk_addr(dev_net(dev), &ipv6_hdr(skb)->saddr, dev, 1))
628 saddr = &ipv6_hdr(skb)->saddr;
630 if ((probes -= neigh->parms->ucast_probes) < 0) {
631 if (!(neigh->nud_state & NUD_VALID)) {
633 "%s: trying to ucast probe in NUD_INVALID: %pI6\n",
636 ndisc_send_ns(dev, neigh, target, target, saddr);
637 } else if ((probes -= neigh->parms->app_probes) < 0) {
642 addrconf_addr_solict_mult(target, &mcaddr);
643 ndisc_send_ns(dev, NULL, target, &mcaddr, saddr);
647 static int pndisc_is_router(const void *pkey,
648 struct net_device *dev)
650 struct pneigh_entry *n;
653 read_lock_bh(&nd_tbl.lock);
654 n = __pneigh_lookup(&nd_tbl, dev_net(dev), pkey, dev);
656 ret = !!(n->flags & NTF_ROUTER);
657 read_unlock_bh(&nd_tbl.lock);
662 static void ndisc_recv_ns(struct sk_buff *skb)
664 struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb);
665 const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr;
666 const struct in6_addr *daddr = &ipv6_hdr(skb)->daddr;
668 u32 ndoptlen = skb->tail - (skb->transport_header +
669 offsetof(struct nd_msg, opt));
670 struct ndisc_options ndopts;
671 struct net_device *dev = skb->dev;
672 struct inet6_ifaddr *ifp;
673 struct inet6_dev *idev = NULL;
674 struct neighbour *neigh;
675 int dad = ipv6_addr_any(saddr);
679 if (ipv6_addr_is_multicast(&msg->target)) {
680 ND_PRINTK(2, warn, "NS: multicast target address\n");
686 * DAD has to be destined for solicited node multicast address.
689 !(daddr->s6_addr32[0] == htonl(0xff020000) &&
690 daddr->s6_addr32[1] == htonl(0x00000000) &&
691 daddr->s6_addr32[2] == htonl(0x00000001) &&
692 daddr->s6_addr [12] == 0xff )) {
693 ND_PRINTK(2, warn, "NS: bad DAD packet (wrong destination)\n");
697 if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) {
698 ND_PRINTK(2, warn, "NS: invalid ND options\n");
702 if (ndopts.nd_opts_src_lladdr) {
703 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, dev);
706 "NS: invalid link-layer address length\n");
711 * If the IP source address is the unspecified address,
712 * there MUST NOT be source link-layer address option
717 "NS: bad DAD packet (link-layer address option)\n");
722 inc = ipv6_addr_is_multicast(daddr);
724 ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1);
727 if (ifp->flags & (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC)) {
730 * We are colliding with another node
732 * so fail our DAD process
734 addrconf_dad_failure(ifp);
738 * This is not a dad solicitation.
739 * If we are an optimistic node,
741 * Otherwise, we should ignore it.
743 if (!(ifp->flags & IFA_F_OPTIMISTIC))
750 struct net *net = dev_net(dev);
752 idev = in6_dev_get(dev);
754 /* XXX: count this drop? */
758 if (ipv6_chk_acast_addr(net, dev, &msg->target) ||
759 (idev->cnf.forwarding &&
760 (net->ipv6.devconf_all->proxy_ndp || idev->cnf.proxy_ndp) &&
761 (is_router = pndisc_is_router(&msg->target, dev)) >= 0)) {
762 if (!(NEIGH_CB(skb)->flags & LOCALLY_ENQUEUED) &&
763 skb->pkt_type != PACKET_HOST &&
765 idev->nd_parms->proxy_delay != 0) {
767 * for anycast or proxy,
768 * sender should delay its response
769 * by a random time between 0 and
770 * MAX_ANYCAST_DELAY_TIME seconds.
771 * (RFC2461) -- yoshfuji
773 struct sk_buff *n = skb_clone(skb, GFP_ATOMIC);
775 pneigh_enqueue(&nd_tbl, idev->nd_parms, n);
783 is_router = !!idev->cnf.forwarding;
786 ndisc_send_na(dev, NULL, &in6addr_linklocal_allnodes, &msg->target,
787 is_router, 0, (ifp != NULL), 1);
792 NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_mcast);
794 NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_ucast);
797 * update / create cache entry
798 * for the source address
800 neigh = __neigh_lookup(&nd_tbl, saddr, dev,
801 !inc || lladdr || !dev->addr_len);
803 neigh_update(neigh, lladdr, NUD_STALE,
804 NEIGH_UPDATE_F_WEAK_OVERRIDE|
805 NEIGH_UPDATE_F_OVERRIDE);
806 if (neigh || !dev->header_ops) {
807 ndisc_send_na(dev, neigh, saddr, &msg->target,
809 1, (ifp != NULL && inc), inc);
811 neigh_release(neigh);
821 static void ndisc_recv_na(struct sk_buff *skb)
823 struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb);
824 const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr;
825 const struct in6_addr *daddr = &ipv6_hdr(skb)->daddr;
827 u32 ndoptlen = skb->tail - (skb->transport_header +
828 offsetof(struct nd_msg, opt));
829 struct ndisc_options ndopts;
830 struct net_device *dev = skb->dev;
831 struct inet6_ifaddr *ifp;
832 struct neighbour *neigh;
834 if (skb->len < sizeof(struct nd_msg)) {
835 ND_PRINTK(2, warn, "NA: packet too short\n");
839 if (ipv6_addr_is_multicast(&msg->target)) {
840 ND_PRINTK(2, warn, "NA: target address is multicast\n");
844 if (ipv6_addr_is_multicast(daddr) &&
845 msg->icmph.icmp6_solicited) {
846 ND_PRINTK(2, warn, "NA: solicited NA is multicasted\n");
850 if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) {
851 ND_PRINTK(2, warn, "NS: invalid ND option\n");
854 if (ndopts.nd_opts_tgt_lladdr) {
855 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, dev);
858 "NA: invalid link-layer address length\n");
862 ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1);
864 if (skb->pkt_type != PACKET_LOOPBACK
865 && (ifp->flags & IFA_F_TENTATIVE)) {
866 addrconf_dad_failure(ifp);
869 /* What should we make now? The advertisement
870 is invalid, but ndisc specs say nothing
871 about it. It could be misconfiguration, or
872 an smart proxy agent tries to help us :-)
874 We should not print the error if NA has been
875 received from loopback - it is just our own
876 unsolicited advertisement.
878 if (skb->pkt_type != PACKET_LOOPBACK)
880 "NA: someone advertises our address %pI6 on %s!\n",
881 &ifp->addr, ifp->idev->dev->name);
885 neigh = neigh_lookup(&nd_tbl, &msg->target, dev);
888 u8 old_flags = neigh->flags;
889 struct net *net = dev_net(dev);
891 if (neigh->nud_state & NUD_FAILED)
895 * Don't update the neighbor cache entry on a proxy NA from
896 * ourselves because either the proxied node is off link or it
897 * has already sent a NA to us.
899 if (lladdr && !memcmp(lladdr, dev->dev_addr, dev->addr_len) &&
900 net->ipv6.devconf_all->forwarding && net->ipv6.devconf_all->proxy_ndp &&
901 pneigh_lookup(&nd_tbl, net, &msg->target, dev, 0)) {
902 /* XXX: idev->cnf.proxy_ndp */
906 neigh_update(neigh, lladdr,
907 msg->icmph.icmp6_solicited ? NUD_REACHABLE : NUD_STALE,
908 NEIGH_UPDATE_F_WEAK_OVERRIDE|
909 (msg->icmph.icmp6_override ? NEIGH_UPDATE_F_OVERRIDE : 0)|
910 NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
911 (msg->icmph.icmp6_router ? NEIGH_UPDATE_F_ISROUTER : 0));
913 if ((old_flags & ~neigh->flags) & NTF_ROUTER) {
915 * Change: router to host
918 rt = rt6_get_dflt_router(saddr, dev);
924 neigh_release(neigh);
928 static void ndisc_recv_rs(struct sk_buff *skb)
930 struct rs_msg *rs_msg = (struct rs_msg *)skb_transport_header(skb);
931 unsigned long ndoptlen = skb->len - sizeof(*rs_msg);
932 struct neighbour *neigh;
933 struct inet6_dev *idev;
934 const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr;
935 struct ndisc_options ndopts;
938 if (skb->len < sizeof(*rs_msg))
941 idev = __in6_dev_get(skb->dev);
943 ND_PRINTK(1, err, "RS: can't find in6 device\n");
947 /* Don't accept RS if we're not in router mode */
948 if (!idev->cnf.forwarding)
952 * Don't update NCE if src = ::;
953 * this implies that the source node has no ip address assigned yet.
955 if (ipv6_addr_any(saddr))
958 /* Parse ND options */
959 if (!ndisc_parse_options(rs_msg->opt, ndoptlen, &ndopts)) {
960 ND_PRINTK(2, notice, "NS: invalid ND option, ignored\n");
964 if (ndopts.nd_opts_src_lladdr) {
965 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr,
971 neigh = __neigh_lookup(&nd_tbl, saddr, skb->dev, 1);
973 neigh_update(neigh, lladdr, NUD_STALE,
974 NEIGH_UPDATE_F_WEAK_OVERRIDE|
975 NEIGH_UPDATE_F_OVERRIDE|
976 NEIGH_UPDATE_F_OVERRIDE_ISROUTER);
977 neigh_release(neigh);
983 static void ndisc_ra_useropt(struct sk_buff *ra, struct nd_opt_hdr *opt)
985 struct icmp6hdr *icmp6h = (struct icmp6hdr *)skb_transport_header(ra);
987 struct nlmsghdr *nlh;
988 struct nduseroptmsg *ndmsg;
989 struct net *net = dev_net(ra->dev);
991 int base_size = NLMSG_ALIGN(sizeof(struct nduseroptmsg)
992 + (opt->nd_opt_len << 3));
993 size_t msg_size = base_size + nla_total_size(sizeof(struct in6_addr));
995 skb = nlmsg_new(msg_size, GFP_ATOMIC);
1001 nlh = nlmsg_put(skb, 0, 0, RTM_NEWNDUSEROPT, base_size, 0);
1003 goto nla_put_failure;
1006 ndmsg = nlmsg_data(nlh);
1007 ndmsg->nduseropt_family = AF_INET6;
1008 ndmsg->nduseropt_ifindex = ra->dev->ifindex;
1009 ndmsg->nduseropt_icmp_type = icmp6h->icmp6_type;
1010 ndmsg->nduseropt_icmp_code = icmp6h->icmp6_code;
1011 ndmsg->nduseropt_opts_len = opt->nd_opt_len << 3;
1013 memcpy(ndmsg + 1, opt, opt->nd_opt_len << 3);
1015 if (nla_put(skb, NDUSEROPT_SRCADDR, sizeof(struct in6_addr),
1016 &ipv6_hdr(ra)->saddr))
1017 goto nla_put_failure;
1018 nlmsg_end(skb, nlh);
1020 rtnl_notify(skb, net, 0, RTNLGRP_ND_USEROPT, NULL, GFP_ATOMIC);
1027 rtnl_set_sk_err(net, RTNLGRP_ND_USEROPT, err);
1030 static void ndisc_router_discovery(struct sk_buff *skb)
1032 struct ra_msg *ra_msg = (struct ra_msg *)skb_transport_header(skb);
1033 struct neighbour *neigh = NULL;
1034 struct inet6_dev *in6_dev;
1035 struct rt6_info *rt = NULL;
1037 struct ndisc_options ndopts;
1039 unsigned int pref = 0;
1041 __u8 * opt = (__u8 *)(ra_msg + 1);
1043 optlen = (skb->tail - skb->transport_header) - sizeof(struct ra_msg);
1045 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) {
1046 ND_PRINTK(2, warn, "RA: source address is not link-local\n");
1050 ND_PRINTK(2, warn, "RA: packet too short\n");
1054 #ifdef CONFIG_IPV6_NDISC_NODETYPE
1055 if (skb->ndisc_nodetype == NDISC_NODETYPE_HOST) {
1056 ND_PRINTK(2, warn, "RA: from host or unauthorized router\n");
1062 * set the RA_RECV flag in the interface
1065 in6_dev = __in6_dev_get(skb->dev);
1066 if (in6_dev == NULL) {
1067 ND_PRINTK(0, err, "RA: can't find inet6 device for %s\n",
1072 if (!ndisc_parse_options(opt, optlen, &ndopts)) {
1073 ND_PRINTK(2, warn, "RA: invalid ND options\n");
1077 if (!ipv6_accept_ra(in6_dev))
1078 goto skip_linkparms;
1080 #ifdef CONFIG_IPV6_NDISC_NODETYPE
1081 /* skip link-specific parameters from interior routers */
1082 if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT)
1083 goto skip_linkparms;
1086 if (in6_dev->if_flags & IF_RS_SENT) {
1088 * flag that an RA was received after an RS was sent
1089 * out on this interface.
1091 in6_dev->if_flags |= IF_RA_RCVD;
1095 * Remember the managed/otherconf flags from most recently
1096 * received RA message (RFC 2462) -- yoshfuji
1098 in6_dev->if_flags = (in6_dev->if_flags & ~(IF_RA_MANAGED |
1100 (ra_msg->icmph.icmp6_addrconf_managed ?
1101 IF_RA_MANAGED : 0) |
1102 (ra_msg->icmph.icmp6_addrconf_other ?
1103 IF_RA_OTHERCONF : 0);
1105 if (!in6_dev->cnf.accept_ra_defrtr)
1108 if (ipv6_chk_addr(dev_net(in6_dev->dev), &ipv6_hdr(skb)->saddr, NULL, 0))
1111 lifetime = ntohs(ra_msg->icmph.icmp6_rt_lifetime);
1113 #ifdef CONFIG_IPV6_ROUTER_PREF
1114 pref = ra_msg->icmph.icmp6_router_pref;
1115 /* 10b is handled as if it were 00b (medium) */
1116 if (pref == ICMPV6_ROUTER_PREF_INVALID ||
1117 !in6_dev->cnf.accept_ra_rtr_pref)
1118 pref = ICMPV6_ROUTER_PREF_MEDIUM;
1121 rt = rt6_get_dflt_router(&ipv6_hdr(skb)->saddr, skb->dev);
1124 neigh = dst_neigh_lookup(&rt->dst, &ipv6_hdr(skb)->saddr);
1127 "RA: %s got default router without neighbour\n",
1133 if (rt && lifetime == 0) {
1138 if (rt == NULL && lifetime) {
1139 ND_PRINTK(3, dbg, "RA: adding default router\n");
1141 rt = rt6_add_dflt_router(&ipv6_hdr(skb)->saddr, skb->dev, pref);
1144 "RA: %s failed to add default route\n",
1149 neigh = dst_neigh_lookup(&rt->dst, &ipv6_hdr(skb)->saddr);
1150 if (neigh == NULL) {
1152 "RA: %s got default router without neighbour\n",
1157 neigh->flags |= NTF_ROUTER;
1159 rt->rt6i_flags = (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
1163 rt6_set_expires(rt, jiffies + (HZ * lifetime));
1164 if (ra_msg->icmph.icmp6_hop_limit) {
1165 in6_dev->cnf.hop_limit = ra_msg->icmph.icmp6_hop_limit;
1167 dst_metric_set(&rt->dst, RTAX_HOPLIMIT,
1168 ra_msg->icmph.icmp6_hop_limit);
1174 * Update Reachable Time and Retrans Timer
1177 if (in6_dev->nd_parms) {
1178 unsigned long rtime = ntohl(ra_msg->retrans_timer);
1180 if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/HZ) {
1181 rtime = (rtime*HZ)/1000;
1184 in6_dev->nd_parms->retrans_time = rtime;
1185 in6_dev->tstamp = jiffies;
1186 inet6_ifinfo_notify(RTM_NEWLINK, in6_dev);
1189 rtime = ntohl(ra_msg->reachable_time);
1190 if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/(3*HZ)) {
1191 rtime = (rtime*HZ)/1000;
1196 if (rtime != in6_dev->nd_parms->base_reachable_time) {
1197 in6_dev->nd_parms->base_reachable_time = rtime;
1198 in6_dev->nd_parms->gc_staletime = 3 * rtime;
1199 in6_dev->nd_parms->reachable_time = neigh_rand_reach_time(rtime);
1200 in6_dev->tstamp = jiffies;
1201 inet6_ifinfo_notify(RTM_NEWLINK, in6_dev);
1213 neigh = __neigh_lookup(&nd_tbl, &ipv6_hdr(skb)->saddr,
1217 if (ndopts.nd_opts_src_lladdr) {
1218 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr,
1222 "RA: invalid link-layer address length\n");
1226 neigh_update(neigh, lladdr, NUD_STALE,
1227 NEIGH_UPDATE_F_WEAK_OVERRIDE|
1228 NEIGH_UPDATE_F_OVERRIDE|
1229 NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
1230 NEIGH_UPDATE_F_ISROUTER);
1233 if (!ipv6_accept_ra(in6_dev))
1236 #ifdef CONFIG_IPV6_ROUTE_INFO
1237 if (ipv6_chk_addr(dev_net(in6_dev->dev), &ipv6_hdr(skb)->saddr, NULL, 0))
1238 goto skip_routeinfo;
1240 if (in6_dev->cnf.accept_ra_rtr_pref && ndopts.nd_opts_ri) {
1241 struct nd_opt_hdr *p;
1242 for (p = ndopts.nd_opts_ri;
1244 p = ndisc_next_option(p, ndopts.nd_opts_ri_end)) {
1245 struct route_info *ri = (struct route_info *)p;
1246 #ifdef CONFIG_IPV6_NDISC_NODETYPE
1247 if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT &&
1248 ri->prefix_len == 0)
1251 if (ri->prefix_len > in6_dev->cnf.accept_ra_rt_info_max_plen)
1253 rt6_route_rcv(skb->dev, (u8*)p, (p->nd_opt_len) << 3,
1254 &ipv6_hdr(skb)->saddr);
1261 #ifdef CONFIG_IPV6_NDISC_NODETYPE
1262 /* skip link-specific ndopts from interior routers */
1263 if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT)
1267 if (in6_dev->cnf.accept_ra_pinfo && ndopts.nd_opts_pi) {
1268 struct nd_opt_hdr *p;
1269 for (p = ndopts.nd_opts_pi;
1271 p = ndisc_next_option(p, ndopts.nd_opts_pi_end)) {
1272 addrconf_prefix_rcv(skb->dev, (u8 *)p,
1273 (p->nd_opt_len) << 3,
1274 ndopts.nd_opts_src_lladdr != NULL);
1278 if (ndopts.nd_opts_mtu) {
1282 memcpy(&n, ((u8*)(ndopts.nd_opts_mtu+1))+2, sizeof(mtu));
1285 if (mtu < IPV6_MIN_MTU || mtu > skb->dev->mtu) {
1286 ND_PRINTK(2, warn, "RA: invalid mtu: %d\n", mtu);
1287 } else if (in6_dev->cnf.mtu6 != mtu) {
1288 in6_dev->cnf.mtu6 = mtu;
1291 dst_metric_set(&rt->dst, RTAX_MTU, mtu);
1293 rt6_mtu_change(skb->dev, mtu);
1297 if (ndopts.nd_useropts) {
1298 struct nd_opt_hdr *p;
1299 for (p = ndopts.nd_useropts;
1301 p = ndisc_next_useropt(p, ndopts.nd_useropts_end)) {
1302 ndisc_ra_useropt(skb, p);
1306 if (ndopts.nd_opts_tgt_lladdr || ndopts.nd_opts_rh) {
1307 ND_PRINTK(2, warn, "RA: invalid RA options\n");
1312 neigh_release(neigh);
1315 static void ndisc_redirect_rcv(struct sk_buff *skb)
1317 #ifdef CONFIG_IPV6_NDISC_NODETYPE
1318 switch (skb->ndisc_nodetype) {
1319 case NDISC_NODETYPE_HOST:
1320 case NDISC_NODETYPE_NODEFAULT:
1322 "Redirect: from host or unauthorized router\n");
1327 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) {
1329 "Redirect: source address is not link-local\n");
1333 icmpv6_notify(skb, NDISC_REDIRECT, 0, 0);
1336 void ndisc_send_redirect(struct sk_buff *skb, const struct in6_addr *target)
1338 struct net_device *dev = skb->dev;
1339 struct net *net = dev_net(dev);
1340 struct sock *sk = net->ipv6.ndisc_sk;
1341 int len = sizeof(struct icmp6hdr) + 2 * sizeof(struct in6_addr);
1342 struct inet_peer *peer;
1343 struct sk_buff *buff;
1344 struct icmp6hdr *icmph;
1345 struct in6_addr saddr_buf;
1346 struct in6_addr *addrp;
1347 struct rt6_info *rt;
1348 struct dst_entry *dst;
1349 struct inet6_dev *idev;
1355 u8 ha_buf[MAX_ADDR_LEN], *ha = NULL;
1358 if (ipv6_get_lladdr(dev, &saddr_buf, IFA_F_TENTATIVE)) {
1359 ND_PRINTK(2, warn, "Redirect: no link-local address on %s\n",
1364 if (!ipv6_addr_equal(&ipv6_hdr(skb)->daddr, target) &&
1365 ipv6_addr_type(target) != (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
1367 "Redirect: target address is not link-local unicast\n");
1371 icmpv6_flow_init(sk, &fl6, NDISC_REDIRECT,
1372 &saddr_buf, &ipv6_hdr(skb)->saddr, dev->ifindex);
1374 dst = ip6_route_output(net, NULL, &fl6);
1379 dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), NULL, 0);
1383 rt = (struct rt6_info *) dst;
1385 if (rt->rt6i_flags & RTF_GATEWAY) {
1387 "Redirect: destination is not a neighbour\n");
1390 peer = inet_getpeer_v6(net->ipv6.peers, &rt->rt6i_dst.addr, 1);
1391 ret = inet_peer_xrlim_allow(peer, 1*HZ);
1397 if (dev->addr_len) {
1398 struct neighbour *neigh = dst_neigh_lookup(skb_dst(skb), target);
1401 "Redirect: no neigh for target address\n");
1405 read_lock_bh(&neigh->lock);
1406 if (neigh->nud_state & NUD_VALID) {
1407 memcpy(ha_buf, neigh->ha, dev->addr_len);
1408 read_unlock_bh(&neigh->lock);
1410 len += ndisc_opt_addr_space(dev);
1412 read_unlock_bh(&neigh->lock);
1414 neigh_release(neigh);
1417 rd_len = min_t(unsigned int,
1418 IPV6_MIN_MTU-sizeof(struct ipv6hdr)-len, skb->len + 8);
1422 hlen = LL_RESERVED_SPACE(dev);
1423 tlen = dev->needed_tailroom;
1424 buff = sock_alloc_send_skb(sk,
1425 (MAX_HEADER + sizeof(struct ipv6hdr) +
1430 "Redirect: %s failed to allocate an skb, err=%d\n",
1435 skb_reserve(buff, hlen);
1436 ip6_nd_hdr(sk, buff, dev, &saddr_buf, &ipv6_hdr(skb)->saddr,
1437 IPPROTO_ICMPV6, len);
1439 skb_set_transport_header(buff, skb_tail_pointer(buff) - buff->data);
1441 icmph = icmp6_hdr(buff);
1443 memset(icmph, 0, sizeof(struct icmp6hdr));
1444 icmph->icmp6_type = NDISC_REDIRECT;
1447 * copy target and destination addresses
1450 addrp = (struct in6_addr *)(icmph + 1);
1453 *addrp = ipv6_hdr(skb)->daddr;
1455 opt = (u8*) (addrp + 1);
1458 * include target_address option
1462 opt = ndisc_fill_addr_option(opt, ND_OPT_TARGET_LL_ADDR, ha,
1463 dev->addr_len, dev->type);
1466 * build redirect option and copy skb over to the new packet.
1470 *(opt++) = ND_OPT_REDIRECT_HDR;
1471 *(opt++) = (rd_len >> 3);
1474 memcpy(opt, ipv6_hdr(skb), rd_len - 8);
1476 icmph->icmp6_cksum = csum_ipv6_magic(&saddr_buf, &ipv6_hdr(skb)->saddr,
1477 len, IPPROTO_ICMPV6,
1478 csum_partial(icmph, len, 0));
1480 skb_dst_set(buff, dst);
1482 idev = __in6_dev_get(dst->dev);
1483 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1484 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, buff, NULL, dst->dev,
1487 ICMP6MSGOUT_INC_STATS(net, idev, NDISC_REDIRECT);
1488 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1498 static void pndisc_redo(struct sk_buff *skb)
1504 int ndisc_rcv(struct sk_buff *skb)
1508 if (!pskb_may_pull(skb, skb->len))
1511 msg = (struct nd_msg *)skb_transport_header(skb);
1513 __skb_push(skb, skb->data - skb_transport_header(skb));
1515 if (ipv6_hdr(skb)->hop_limit != 255) {
1516 ND_PRINTK(2, warn, "NDISC: invalid hop-limit: %d\n",
1517 ipv6_hdr(skb)->hop_limit);
1521 if (msg->icmph.icmp6_code != 0) {
1522 ND_PRINTK(2, warn, "NDISC: invalid ICMPv6 code: %d\n",
1523 msg->icmph.icmp6_code);
1527 memset(NEIGH_CB(skb), 0, sizeof(struct neighbour_cb));
1529 switch (msg->icmph.icmp6_type) {
1530 case NDISC_NEIGHBOUR_SOLICITATION:
1534 case NDISC_NEIGHBOUR_ADVERTISEMENT:
1538 case NDISC_ROUTER_SOLICITATION:
1542 case NDISC_ROUTER_ADVERTISEMENT:
1543 ndisc_router_discovery(skb);
1546 case NDISC_REDIRECT:
1547 ndisc_redirect_rcv(skb);
1554 static int ndisc_netdev_event(struct notifier_block *this, unsigned long event, void *ptr)
1556 struct net_device *dev = ptr;
1557 struct net *net = dev_net(dev);
1558 struct inet6_dev *idev;
1561 case NETDEV_CHANGEADDR:
1562 neigh_changeaddr(&nd_tbl, dev);
1563 fib6_run_gc(~0UL, net);
1564 idev = in6_dev_get(dev);
1567 if (idev->cnf.ndisc_notify)
1568 ndisc_send_unsol_na(dev);
1572 neigh_ifdown(&nd_tbl, dev);
1573 fib6_run_gc(~0UL, net);
1575 case NETDEV_NOTIFY_PEERS:
1576 ndisc_send_unsol_na(dev);
1585 static struct notifier_block ndisc_netdev_notifier = {
1586 .notifier_call = ndisc_netdev_event,
1589 #ifdef CONFIG_SYSCTL
1590 static void ndisc_warn_deprecated_sysctl(struct ctl_table *ctl,
1591 const char *func, const char *dev_name)
1593 static char warncomm[TASK_COMM_LEN];
1595 if (strcmp(warncomm, current->comm) && warned < 5) {
1596 strcpy(warncomm, current->comm);
1597 pr_warn("process `%s' is using deprecated sysctl (%s) net.ipv6.neigh.%s.%s - use net.ipv6.neigh.%s.%s_ms instead\n",
1599 dev_name, ctl->procname,
1600 dev_name, ctl->procname);
1605 int ndisc_ifinfo_sysctl_change(struct ctl_table *ctl, int write, void __user *buffer, size_t *lenp, loff_t *ppos)
1607 struct net_device *dev = ctl->extra1;
1608 struct inet6_dev *idev;
1611 if ((strcmp(ctl->procname, "retrans_time") == 0) ||
1612 (strcmp(ctl->procname, "base_reachable_time") == 0))
1613 ndisc_warn_deprecated_sysctl(ctl, "syscall", dev ? dev->name : "default");
1615 if (strcmp(ctl->procname, "retrans_time") == 0)
1616 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
1618 else if (strcmp(ctl->procname, "base_reachable_time") == 0)
1619 ret = proc_dointvec_jiffies(ctl, write,
1620 buffer, lenp, ppos);
1622 else if ((strcmp(ctl->procname, "retrans_time_ms") == 0) ||
1623 (strcmp(ctl->procname, "base_reachable_time_ms") == 0))
1624 ret = proc_dointvec_ms_jiffies(ctl, write,
1625 buffer, lenp, ppos);
1629 if (write && ret == 0 && dev && (idev = in6_dev_get(dev)) != NULL) {
1630 if (ctl->data == &idev->nd_parms->base_reachable_time)
1631 idev->nd_parms->reachable_time = neigh_rand_reach_time(idev->nd_parms->base_reachable_time);
1632 idev->tstamp = jiffies;
1633 inet6_ifinfo_notify(RTM_NEWLINK, idev);
1642 static int __net_init ndisc_net_init(struct net *net)
1644 struct ipv6_pinfo *np;
1648 err = inet_ctl_sock_create(&sk, PF_INET6,
1649 SOCK_RAW, IPPROTO_ICMPV6, net);
1652 "NDISC: Failed to initialize the control socket (err %d)\n",
1657 net->ipv6.ndisc_sk = sk;
1660 np->hop_limit = 255;
1661 /* Do not loopback ndisc messages */
1667 static void __net_exit ndisc_net_exit(struct net *net)
1669 inet_ctl_sock_destroy(net->ipv6.ndisc_sk);
1672 static struct pernet_operations ndisc_net_ops = {
1673 .init = ndisc_net_init,
1674 .exit = ndisc_net_exit,
1677 int __init ndisc_init(void)
1681 err = register_pernet_subsys(&ndisc_net_ops);
1685 * Initialize the neighbour table
1687 neigh_table_init(&nd_tbl);
1689 #ifdef CONFIG_SYSCTL
1690 err = neigh_sysctl_register(NULL, &nd_tbl.parms, "ipv6",
1691 &ndisc_ifinfo_sysctl_change);
1693 goto out_unregister_pernet;
1695 err = register_netdevice_notifier(&ndisc_netdev_notifier);
1697 goto out_unregister_sysctl;
1701 out_unregister_sysctl:
1702 #ifdef CONFIG_SYSCTL
1703 neigh_sysctl_unregister(&nd_tbl.parms);
1704 out_unregister_pernet:
1706 unregister_pernet_subsys(&ndisc_net_ops);
1710 void ndisc_cleanup(void)
1712 unregister_netdevice_notifier(&ndisc_netdev_notifier);
1713 #ifdef CONFIG_SYSCTL
1714 neigh_sysctl_unregister(&nd_tbl.parms);
1716 neigh_table_clear(&nd_tbl);
1717 unregister_pernet_subsys(&ndisc_net_ops);