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 * Lars Fenneberg : fixed MTU setting on receipt
21 * Janos Farkas : kmalloc failure checks
22 * Alexey Kuznetsov : state machine reworked
23 * and moved to net/core.
24 * Pekka Savola : RFC2461 validation
25 * YOSHIFUJI Hideaki @USAGI : Verify ND options properly
28 /* Set to 3 to get tracing... */
31 #define ND_PRINTK(fmt, args...) do { if (net_ratelimit()) { printk(fmt, ## args); } } while(0)
32 #define ND_NOPRINTK(x...) do { ; } while(0)
33 #define ND_PRINTK0 ND_PRINTK
34 #define ND_PRINTK1 ND_NOPRINTK
35 #define ND_PRINTK2 ND_NOPRINTK
36 #define ND_PRINTK3 ND_NOPRINTK
39 #define ND_PRINTK1 ND_PRINTK
43 #define ND_PRINTK2 ND_PRINTK
47 #define ND_PRINTK3 ND_PRINTK
50 #include <linux/module.h>
51 #include <linux/errno.h>
52 #include <linux/types.h>
53 #include <linux/socket.h>
54 #include <linux/sockios.h>
55 #include <linux/sched.h>
56 #include <linux/net.h>
57 #include <linux/in6.h>
58 #include <linux/route.h>
59 #include <linux/init.h>
60 #include <linux/rcupdate.h>
62 #include <linux/sysctl.h>
65 #include <linux/if_addr.h>
66 #include <linux/if_arp.h>
67 #include <linux/ipv6.h>
68 #include <linux/icmpv6.h>
69 #include <linux/jhash.h>
75 #include <net/protocol.h>
76 #include <net/ndisc.h>
77 #include <net/ip6_route.h>
78 #include <net/addrconf.h>
82 #include <net/ip6_checksum.h>
83 #include <linux/proc_fs.h>
85 #include <linux/netfilter.h>
86 #include <linux/netfilter_ipv6.h>
88 static struct socket *ndisc_socket;
90 static u32 ndisc_hash(const void *pkey, const struct net_device *dev);
91 static int ndisc_constructor(struct neighbour *neigh);
92 static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb);
93 static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb);
94 static int pndisc_constructor(struct pneigh_entry *n);
95 static void pndisc_destructor(struct pneigh_entry *n);
96 static void pndisc_redo(struct sk_buff *skb);
98 static struct neigh_ops ndisc_generic_ops = {
100 .solicit = ndisc_solicit,
101 .error_report = ndisc_error_report,
102 .output = neigh_resolve_output,
103 .connected_output = neigh_connected_output,
104 .hh_output = dev_queue_xmit,
105 .queue_xmit = dev_queue_xmit,
108 static struct neigh_ops ndisc_hh_ops = {
110 .solicit = ndisc_solicit,
111 .error_report = ndisc_error_report,
112 .output = neigh_resolve_output,
113 .connected_output = neigh_resolve_output,
114 .hh_output = dev_queue_xmit,
115 .queue_xmit = dev_queue_xmit,
119 static struct neigh_ops ndisc_direct_ops = {
121 .output = dev_queue_xmit,
122 .connected_output = dev_queue_xmit,
123 .hh_output = dev_queue_xmit,
124 .queue_xmit = dev_queue_xmit,
127 struct neigh_table nd_tbl = {
129 .entry_size = sizeof(struct neighbour) + sizeof(struct in6_addr),
130 .key_len = sizeof(struct in6_addr),
132 .constructor = ndisc_constructor,
133 .pconstructor = pndisc_constructor,
134 .pdestructor = pndisc_destructor,
135 .proxy_redo = pndisc_redo,
139 .base_reachable_time = 30 * HZ,
140 .retrans_time = 1 * HZ,
141 .gc_staletime = 60 * HZ,
142 .reachable_time = 30 * HZ,
143 .delay_probe_time = 5 * HZ,
147 .anycast_delay = 1 * HZ,
148 .proxy_delay = (8 * HZ) / 10,
151 .gc_interval = 30 * HZ,
158 struct ndisc_options {
159 struct nd_opt_hdr *nd_opt_array[__ND_OPT_ARRAY_MAX];
160 #ifdef CONFIG_IPV6_ROUTE_INFO
161 struct nd_opt_hdr *nd_opts_ri;
162 struct nd_opt_hdr *nd_opts_ri_end;
166 #define nd_opts_src_lladdr nd_opt_array[ND_OPT_SOURCE_LL_ADDR]
167 #define nd_opts_tgt_lladdr nd_opt_array[ND_OPT_TARGET_LL_ADDR]
168 #define nd_opts_pi nd_opt_array[ND_OPT_PREFIX_INFO]
169 #define nd_opts_pi_end nd_opt_array[__ND_OPT_PREFIX_INFO_END]
170 #define nd_opts_rh nd_opt_array[ND_OPT_REDIRECT_HDR]
171 #define nd_opts_mtu nd_opt_array[ND_OPT_MTU]
173 #define NDISC_OPT_SPACE(len) (((len)+2+7)&~7)
176 * Return the padding between the option length and the start of the
177 * link addr. Currently only IP-over-InfiniBand needs this, although
178 * if RFC 3831 IPv6-over-Fibre Channel is ever implemented it may
179 * also need a pad of 2.
181 static int ndisc_addr_option_pad(unsigned short type)
184 case ARPHRD_INFINIBAND: return 2;
189 static inline int ndisc_opt_addr_space(struct net_device *dev)
191 return NDISC_OPT_SPACE(dev->addr_len + ndisc_addr_option_pad(dev->type));
194 static u8 *ndisc_fill_addr_option(u8 *opt, int type, void *data, int data_len,
195 unsigned short addr_type)
197 int space = NDISC_OPT_SPACE(data_len);
198 int pad = ndisc_addr_option_pad(addr_type);
203 memset(opt + 2, 0, pad);
207 memcpy(opt+2, data, data_len);
210 if ((space -= data_len) > 0)
211 memset(opt, 0, space);
215 static struct nd_opt_hdr *ndisc_next_option(struct nd_opt_hdr *cur,
216 struct nd_opt_hdr *end)
219 if (!cur || !end || cur >= end)
221 type = cur->nd_opt_type;
223 cur = ((void *)cur) + (cur->nd_opt_len << 3);
224 } while(cur < end && cur->nd_opt_type != type);
225 return (cur <= end && cur->nd_opt_type == type ? cur : NULL);
228 static struct ndisc_options *ndisc_parse_options(u8 *opt, int opt_len,
229 struct ndisc_options *ndopts)
231 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)opt;
233 if (!nd_opt || opt_len < 0 || !ndopts)
235 memset(ndopts, 0, sizeof(*ndopts));
238 if (opt_len < sizeof(struct nd_opt_hdr))
240 l = nd_opt->nd_opt_len << 3;
241 if (opt_len < l || l == 0)
243 switch (nd_opt->nd_opt_type) {
244 case ND_OPT_SOURCE_LL_ADDR:
245 case ND_OPT_TARGET_LL_ADDR:
247 case ND_OPT_REDIRECT_HDR:
248 if (ndopts->nd_opt_array[nd_opt->nd_opt_type]) {
249 ND_PRINTK2(KERN_WARNING
250 "%s(): duplicated ND6 option found: type=%d\n",
252 nd_opt->nd_opt_type);
254 ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt;
257 case ND_OPT_PREFIX_INFO:
258 ndopts->nd_opts_pi_end = nd_opt;
259 if (ndopts->nd_opt_array[nd_opt->nd_opt_type] == 0)
260 ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt;
262 #ifdef CONFIG_IPV6_ROUTE_INFO
263 case ND_OPT_ROUTE_INFO:
264 ndopts->nd_opts_ri_end = nd_opt;
265 if (!ndopts->nd_opts_ri)
266 ndopts->nd_opts_ri = nd_opt;
271 * Unknown options must be silently ignored,
272 * to accommodate future extension to the protocol.
274 ND_PRINTK2(KERN_NOTICE
275 "%s(): ignored unsupported option; type=%d, len=%d\n",
277 nd_opt->nd_opt_type, nd_opt->nd_opt_len);
280 nd_opt = ((void *)nd_opt) + l;
285 static inline u8 *ndisc_opt_addr_data(struct nd_opt_hdr *p,
286 struct net_device *dev)
288 u8 *lladdr = (u8 *)(p + 1);
289 int lladdrlen = p->nd_opt_len << 3;
290 int prepad = ndisc_addr_option_pad(dev->type);
291 if (lladdrlen != NDISC_OPT_SPACE(dev->addr_len + prepad))
293 return (lladdr + prepad);
296 int ndisc_mc_map(struct in6_addr *addr, char *buf, struct net_device *dev, int dir)
300 case ARPHRD_IEEE802: /* Not sure. Check it later. --ANK */
302 ipv6_eth_mc_map(addr, buf);
304 case ARPHRD_IEEE802_TR:
305 ipv6_tr_mc_map(addr,buf);
308 ipv6_arcnet_mc_map(addr, buf);
310 case ARPHRD_INFINIBAND:
311 ipv6_ib_mc_map(addr, buf);
315 memcpy(buf, dev->broadcast, dev->addr_len);
322 EXPORT_SYMBOL(ndisc_mc_map);
324 static u32 ndisc_hash(const void *pkey, const struct net_device *dev)
326 const u32 *p32 = pkey;
330 for (i = 0; i < (sizeof(struct in6_addr) / sizeof(u32)); i++)
333 return jhash_2words(addr_hash, dev->ifindex, nd_tbl.hash_rnd);
336 static int ndisc_constructor(struct neighbour *neigh)
338 struct in6_addr *addr = (struct in6_addr*)&neigh->primary_key;
339 struct net_device *dev = neigh->dev;
340 struct inet6_dev *in6_dev;
341 struct neigh_parms *parms;
342 int is_multicast = ipv6_addr_is_multicast(addr);
345 in6_dev = in6_dev_get(dev);
346 if (in6_dev == NULL) {
351 parms = in6_dev->nd_parms;
352 __neigh_parms_put(neigh->parms);
353 neigh->parms = neigh_parms_clone(parms);
356 neigh->type = is_multicast ? RTN_MULTICAST : RTN_UNICAST;
357 if (dev->hard_header == NULL) {
358 neigh->nud_state = NUD_NOARP;
359 neigh->ops = &ndisc_direct_ops;
360 neigh->output = neigh->ops->queue_xmit;
363 neigh->nud_state = NUD_NOARP;
364 ndisc_mc_map(addr, neigh->ha, dev, 1);
365 } else if (dev->flags&(IFF_NOARP|IFF_LOOPBACK)) {
366 neigh->nud_state = NUD_NOARP;
367 memcpy(neigh->ha, dev->dev_addr, dev->addr_len);
368 if (dev->flags&IFF_LOOPBACK)
369 neigh->type = RTN_LOCAL;
370 } else if (dev->flags&IFF_POINTOPOINT) {
371 neigh->nud_state = NUD_NOARP;
372 memcpy(neigh->ha, dev->broadcast, dev->addr_len);
374 if (dev->hard_header_cache)
375 neigh->ops = &ndisc_hh_ops;
377 neigh->ops = &ndisc_generic_ops;
378 if (neigh->nud_state&NUD_VALID)
379 neigh->output = neigh->ops->connected_output;
381 neigh->output = neigh->ops->output;
383 in6_dev_put(in6_dev);
387 static int pndisc_constructor(struct pneigh_entry *n)
389 struct in6_addr *addr = (struct in6_addr*)&n->key;
390 struct in6_addr maddr;
391 struct net_device *dev = n->dev;
393 if (dev == NULL || __in6_dev_get(dev) == NULL)
395 addrconf_addr_solict_mult(addr, &maddr);
396 ipv6_dev_mc_inc(dev, &maddr);
400 static void pndisc_destructor(struct pneigh_entry *n)
402 struct in6_addr *addr = (struct in6_addr*)&n->key;
403 struct in6_addr maddr;
404 struct net_device *dev = n->dev;
406 if (dev == NULL || __in6_dev_get(dev) == NULL)
408 addrconf_addr_solict_mult(addr, &maddr);
409 ipv6_dev_mc_dec(dev, &maddr);
413 * Send a Neighbour Advertisement
416 static inline void ndisc_flow_init(struct flowi *fl, u8 type,
417 struct in6_addr *saddr, struct in6_addr *daddr,
420 memset(fl, 0, sizeof(*fl));
421 ipv6_addr_copy(&fl->fl6_src, saddr);
422 ipv6_addr_copy(&fl->fl6_dst, daddr);
423 fl->proto = IPPROTO_ICMPV6;
424 fl->fl_icmp_type = type;
425 fl->fl_icmp_code = 0;
427 security_sk_classify_flow(ndisc_socket->sk, fl);
430 static void ndisc_send_na(struct net_device *dev, struct neighbour *neigh,
431 struct in6_addr *daddr, struct in6_addr *solicited_addr,
432 int router, int solicited, int override, int inc_opt)
434 struct in6_addr tmpaddr;
435 struct inet6_ifaddr *ifp;
436 struct inet6_dev *idev;
438 struct dst_entry* dst;
439 struct sock *sk = ndisc_socket->sk;
440 struct in6_addr *src_addr;
446 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
448 /* for anycast or proxy, solicited_addr != src_addr */
449 ifp = ipv6_get_ifaddr(solicited_addr, dev, 1);
451 src_addr = solicited_addr;
452 if (ifp->flags & IFA_F_OPTIMISTIC)
456 if (ipv6_dev_get_saddr(dev, daddr, &tmpaddr))
461 ndisc_flow_init(&fl, NDISC_NEIGHBOUR_ADVERTISEMENT, src_addr, daddr,
464 dst = ndisc_dst_alloc(dev, neigh, daddr, ip6_output);
468 err = xfrm_lookup(&dst, &fl, NULL, 0);
474 len += ndisc_opt_addr_space(dev);
479 skb = sock_alloc_send_skb(sk,
480 (MAX_HEADER + sizeof(struct ipv6hdr) +
481 len + LL_RESERVED_SPACE(dev)),
486 "ICMPv6 NA: %s() failed to allocate an skb.\n",
492 skb_reserve(skb, LL_RESERVED_SPACE(dev));
493 ip6_nd_hdr(sk, skb, dev, src_addr, daddr, IPPROTO_ICMPV6, len);
495 msg = (struct nd_msg *)skb_put(skb, len);
496 skb->h.raw = (unsigned char*)msg;
498 msg->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
499 msg->icmph.icmp6_code = 0;
500 msg->icmph.icmp6_cksum = 0;
502 msg->icmph.icmp6_unused = 0;
503 msg->icmph.icmp6_router = router;
504 msg->icmph.icmp6_solicited = solicited;
505 msg->icmph.icmp6_override = override;
507 /* Set the target address. */
508 ipv6_addr_copy(&msg->target, solicited_addr);
511 ndisc_fill_addr_option(msg->opt, ND_OPT_TARGET_LL_ADDR, dev->dev_addr,
512 dev->addr_len, dev->type);
515 msg->icmph.icmp6_cksum = csum_ipv6_magic(src_addr, daddr, len,
517 csum_partial((__u8 *) msg,
521 idev = in6_dev_get(dst->dev);
522 IP6_INC_STATS(idev, IPSTATS_MIB_OUTREQUESTS);
523 err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, dst->dev, dst_output);
525 ICMP6_INC_STATS(idev, ICMP6_MIB_OUTNEIGHBORADVERTISEMENTS);
526 ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS);
529 if (likely(idev != NULL))
533 void ndisc_send_ns(struct net_device *dev, struct neighbour *neigh,
534 struct in6_addr *solicit,
535 struct in6_addr *daddr, struct in6_addr *saddr)
538 struct dst_entry* dst;
539 struct inet6_dev *idev;
540 struct sock *sk = ndisc_socket->sk;
543 struct in6_addr addr_buf;
549 if (ipv6_get_lladdr(dev, &addr_buf,
550 (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC)))
555 ndisc_flow_init(&fl, NDISC_NEIGHBOUR_SOLICITATION, saddr, daddr,
558 dst = ndisc_dst_alloc(dev, neigh, daddr, ip6_output);
562 err = xfrm_lookup(&dst, &fl, NULL, 0);
566 len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
567 send_llinfo = dev->addr_len && !ipv6_addr_any(saddr);
569 len += ndisc_opt_addr_space(dev);
571 skb = sock_alloc_send_skb(sk,
572 (MAX_HEADER + sizeof(struct ipv6hdr) +
573 len + LL_RESERVED_SPACE(dev)),
577 "ICMPv6 NA: %s() failed to allocate an skb.\n",
583 skb_reserve(skb, LL_RESERVED_SPACE(dev));
584 ip6_nd_hdr(sk, skb, dev, saddr, daddr, IPPROTO_ICMPV6, len);
586 msg = (struct nd_msg *)skb_put(skb, len);
587 skb->h.raw = (unsigned char*)msg;
588 msg->icmph.icmp6_type = NDISC_NEIGHBOUR_SOLICITATION;
589 msg->icmph.icmp6_code = 0;
590 msg->icmph.icmp6_cksum = 0;
591 msg->icmph.icmp6_unused = 0;
593 /* Set the target address. */
594 ipv6_addr_copy(&msg->target, solicit);
597 ndisc_fill_addr_option(msg->opt, ND_OPT_SOURCE_LL_ADDR, dev->dev_addr,
598 dev->addr_len, dev->type);
601 msg->icmph.icmp6_cksum = csum_ipv6_magic(&skb->nh.ipv6h->saddr,
604 csum_partial((__u8 *) msg,
608 idev = in6_dev_get(dst->dev);
609 IP6_INC_STATS(idev, IPSTATS_MIB_OUTREQUESTS);
610 err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, dst->dev, dst_output);
612 ICMP6_INC_STATS(idev, ICMP6_MIB_OUTNEIGHBORSOLICITS);
613 ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS);
616 if (likely(idev != NULL))
620 void ndisc_send_rs(struct net_device *dev, struct in6_addr *saddr,
621 struct in6_addr *daddr)
624 struct dst_entry* dst;
625 struct inet6_dev *idev;
626 struct sock *sk = ndisc_socket->sk;
628 struct icmp6hdr *hdr;
630 int send_sllao = dev->addr_len;
635 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
637 * According to section 2.2 of RFC 4429, we must not
638 * send router solicitations with a sllao from
639 * optimistic addresses, but we may send the solicitation
640 * if we don't include the sllao. So here we check
641 * if our address is optimistic, and if so, we
642 * supress the inclusion of the sllao.
645 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(saddr, dev, 1);
647 if (ifp->flags & IFA_F_OPTIMISTIC) {
656 ndisc_flow_init(&fl, NDISC_ROUTER_SOLICITATION, saddr, daddr,
659 dst = ndisc_dst_alloc(dev, NULL, daddr, ip6_output);
663 err = xfrm_lookup(&dst, &fl, NULL, 0);
667 len = sizeof(struct icmp6hdr);
669 len += ndisc_opt_addr_space(dev);
671 skb = sock_alloc_send_skb(sk,
672 (MAX_HEADER + sizeof(struct ipv6hdr) +
673 len + LL_RESERVED_SPACE(dev)),
677 "ICMPv6 RS: %s() failed to allocate an skb.\n",
683 skb_reserve(skb, LL_RESERVED_SPACE(dev));
684 ip6_nd_hdr(sk, skb, dev, saddr, daddr, IPPROTO_ICMPV6, len);
686 hdr = (struct icmp6hdr *)skb_put(skb, len);
687 skb->h.raw = (unsigned char*)hdr;
688 hdr->icmp6_type = NDISC_ROUTER_SOLICITATION;
690 hdr->icmp6_cksum = 0;
691 hdr->icmp6_unused = 0;
693 opt = (u8*) (hdr + 1);
696 ndisc_fill_addr_option(opt, ND_OPT_SOURCE_LL_ADDR, dev->dev_addr,
697 dev->addr_len, dev->type);
700 hdr->icmp6_cksum = csum_ipv6_magic(&skb->nh.ipv6h->saddr, daddr, len,
702 csum_partial((__u8 *) hdr, len, 0));
706 idev = in6_dev_get(dst->dev);
707 IP6_INC_STATS(idev, IPSTATS_MIB_OUTREQUESTS);
708 err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, dst->dev, dst_output);
710 ICMP6_INC_STATS(idev, ICMP6_MIB_OUTROUTERSOLICITS);
711 ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS);
714 if (likely(idev != NULL))
719 static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb)
722 * "The sender MUST return an ICMP
723 * destination unreachable"
725 dst_link_failure(skb);
729 /* Called with locked neigh: either read or both */
731 static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb)
733 struct in6_addr *saddr = NULL;
734 struct in6_addr mcaddr;
735 struct net_device *dev = neigh->dev;
736 struct in6_addr *target = (struct in6_addr *)&neigh->primary_key;
737 int probes = atomic_read(&neigh->probes);
739 if (skb && ipv6_chk_addr(&skb->nh.ipv6h->saddr, dev, 1))
740 saddr = &skb->nh.ipv6h->saddr;
742 if ((probes -= neigh->parms->ucast_probes) < 0) {
743 if (!(neigh->nud_state & NUD_VALID)) {
744 ND_PRINTK1(KERN_DEBUG
745 "%s(): trying to ucast probe in NUD_INVALID: "
750 ndisc_send_ns(dev, neigh, target, target, saddr);
751 } else if ((probes -= neigh->parms->app_probes) < 0) {
756 addrconf_addr_solict_mult(target, &mcaddr);
757 ndisc_send_ns(dev, NULL, target, &mcaddr, saddr);
761 static void ndisc_recv_ns(struct sk_buff *skb)
763 struct nd_msg *msg = (struct nd_msg *)skb->h.raw;
764 struct in6_addr *saddr = &skb->nh.ipv6h->saddr;
765 struct in6_addr *daddr = &skb->nh.ipv6h->daddr;
767 u32 ndoptlen = skb->tail - msg->opt;
768 struct ndisc_options ndopts;
769 struct net_device *dev = skb->dev;
770 struct inet6_ifaddr *ifp;
771 struct inet6_dev *idev = NULL;
772 struct neighbour *neigh;
773 struct pneigh_entry *pneigh = NULL;
774 int dad = ipv6_addr_any(saddr);
778 if (ipv6_addr_is_multicast(&msg->target)) {
779 ND_PRINTK2(KERN_WARNING
780 "ICMPv6 NS: multicast target address");
786 * DAD has to be destined for solicited node multicast address.
789 !(daddr->s6_addr32[0] == htonl(0xff020000) &&
790 daddr->s6_addr32[1] == htonl(0x00000000) &&
791 daddr->s6_addr32[2] == htonl(0x00000001) &&
792 daddr->s6_addr [12] == 0xff )) {
793 ND_PRINTK2(KERN_WARNING
794 "ICMPv6 NS: bad DAD packet (wrong destination)\n");
798 if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) {
799 ND_PRINTK2(KERN_WARNING
800 "ICMPv6 NS: invalid ND options\n");
804 if (ndopts.nd_opts_src_lladdr) {
805 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, dev);
807 ND_PRINTK2(KERN_WARNING
808 "ICMPv6 NS: invalid link-layer address length\n");
813 * If the IP source address is the unspecified address,
814 * there MUST NOT be source link-layer address option
818 ND_PRINTK2(KERN_WARNING
819 "ICMPv6 NS: bad DAD packet (link-layer address option)\n");
824 inc = ipv6_addr_is_multicast(daddr);
826 if ((ifp = ipv6_get_ifaddr(&msg->target, dev, 1)) != NULL) {
828 if (ifp->flags & (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC)) {
830 if (dev->type == ARPHRD_IEEE802_TR) {
831 unsigned char *sadr = skb->mac.raw;
832 if (((sadr[8] ^ dev->dev_addr[0]) & 0x7f) == 0 &&
833 sadr[9] == dev->dev_addr[1] &&
834 sadr[10] == dev->dev_addr[2] &&
835 sadr[11] == dev->dev_addr[3] &&
836 sadr[12] == dev->dev_addr[4] &&
837 sadr[13] == dev->dev_addr[5]) {
838 /* looped-back to us */
844 * We are colliding with another node
846 * so fail our DAD process
848 addrconf_dad_failure(ifp);
852 * This is not a dad solicitation.
853 * If we are an optimistic node,
855 * Otherwise, we should ignore it.
857 if (!(ifp->flags & IFA_F_OPTIMISTIC))
864 idev = in6_dev_get(dev);
866 /* XXX: count this drop? */
870 if (ipv6_chk_acast_addr(dev, &msg->target) ||
871 (idev->cnf.forwarding &&
872 (ipv6_devconf.proxy_ndp || idev->cnf.proxy_ndp) &&
873 (pneigh = pneigh_lookup(&nd_tbl,
874 &msg->target, dev, 0)) != NULL)) {
875 if (!(NEIGH_CB(skb)->flags & LOCALLY_ENQUEUED) &&
876 skb->pkt_type != PACKET_HOST &&
878 idev->nd_parms->proxy_delay != 0) {
880 * for anycast or proxy,
881 * sender should delay its response
882 * by a random time between 0 and
883 * MAX_ANYCAST_DELAY_TIME seconds.
884 * (RFC2461) -- yoshfuji
886 struct sk_buff *n = skb_clone(skb, GFP_ATOMIC);
888 pneigh_enqueue(&nd_tbl, idev->nd_parms, n);
895 is_router = !!(pneigh ? pneigh->flags & NTF_ROUTER : idev->cnf.forwarding);
898 struct in6_addr maddr;
900 ipv6_addr_all_nodes(&maddr);
901 ndisc_send_na(dev, NULL, &maddr, &msg->target,
902 is_router, 0, (ifp != NULL), 1);
907 NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_mcast);
909 NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_ucast);
912 * update / create cache entry
913 * for the source address
915 neigh = __neigh_lookup(&nd_tbl, saddr, dev,
916 !inc || lladdr || !dev->addr_len);
918 neigh_update(neigh, lladdr, NUD_STALE,
919 NEIGH_UPDATE_F_WEAK_OVERRIDE|
920 NEIGH_UPDATE_F_OVERRIDE);
921 if (neigh || !dev->hard_header) {
922 ndisc_send_na(dev, neigh, saddr, &msg->target,
924 1, (ifp != NULL && inc), inc);
926 neigh_release(neigh);
938 static void ndisc_recv_na(struct sk_buff *skb)
940 struct nd_msg *msg = (struct nd_msg *)skb->h.raw;
941 struct in6_addr *saddr = &skb->nh.ipv6h->saddr;
942 struct in6_addr *daddr = &skb->nh.ipv6h->daddr;
944 u32 ndoptlen = skb->tail - msg->opt;
945 struct ndisc_options ndopts;
946 struct net_device *dev = skb->dev;
947 struct inet6_ifaddr *ifp;
948 struct neighbour *neigh;
950 if (skb->len < sizeof(struct nd_msg)) {
951 ND_PRINTK2(KERN_WARNING
952 "ICMPv6 NA: packet too short\n");
956 if (ipv6_addr_is_multicast(&msg->target)) {
957 ND_PRINTK2(KERN_WARNING
958 "ICMPv6 NA: target address is multicast.\n");
962 if (ipv6_addr_is_multicast(daddr) &&
963 msg->icmph.icmp6_solicited) {
964 ND_PRINTK2(KERN_WARNING
965 "ICMPv6 NA: solicited NA is multicasted.\n");
969 if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) {
970 ND_PRINTK2(KERN_WARNING
971 "ICMPv6 NS: invalid ND option\n");
974 if (ndopts.nd_opts_tgt_lladdr) {
975 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, dev);
977 ND_PRINTK2(KERN_WARNING
978 "ICMPv6 NA: invalid link-layer address length\n");
982 if ((ifp = ipv6_get_ifaddr(&msg->target, dev, 1))) {
983 if (ifp->flags & IFA_F_TENTATIVE) {
984 addrconf_dad_failure(ifp);
987 /* What should we make now? The advertisement
988 is invalid, but ndisc specs say nothing
989 about it. It could be misconfiguration, or
990 an smart proxy agent tries to help us :-)
992 ND_PRINTK1(KERN_WARNING
993 "ICMPv6 NA: someone advertises our address on %s!\n",
994 ifp->idev->dev->name);
998 neigh = neigh_lookup(&nd_tbl, &msg->target, dev);
1001 u8 old_flags = neigh->flags;
1003 if (neigh->nud_state & NUD_FAILED)
1007 * Don't update the neighbor cache entry on a proxy NA from
1008 * ourselves because either the proxied node is off link or it
1009 * has already sent a NA to us.
1011 if (lladdr && !memcmp(lladdr, dev->dev_addr, dev->addr_len) &&
1012 ipv6_devconf.forwarding && ipv6_devconf.proxy_ndp &&
1013 pneigh_lookup(&nd_tbl, &msg->target, dev, 0)) {
1014 /* XXX: idev->cnf.prixy_ndp */
1018 neigh_update(neigh, lladdr,
1019 msg->icmph.icmp6_solicited ? NUD_REACHABLE : NUD_STALE,
1020 NEIGH_UPDATE_F_WEAK_OVERRIDE|
1021 (msg->icmph.icmp6_override ? NEIGH_UPDATE_F_OVERRIDE : 0)|
1022 NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
1023 (msg->icmph.icmp6_router ? NEIGH_UPDATE_F_ISROUTER : 0));
1025 if ((old_flags & ~neigh->flags) & NTF_ROUTER) {
1027 * Change: router to host
1029 struct rt6_info *rt;
1030 rt = rt6_get_dflt_router(saddr, dev);
1036 neigh_release(neigh);
1040 static void ndisc_recv_rs(struct sk_buff *skb)
1042 struct rs_msg *rs_msg = (struct rs_msg *) skb->h.raw;
1043 unsigned long ndoptlen = skb->len - sizeof(*rs_msg);
1044 struct neighbour *neigh;
1045 struct inet6_dev *idev;
1046 struct in6_addr *saddr = &skb->nh.ipv6h->saddr;
1047 struct ndisc_options ndopts;
1050 if (skb->len < sizeof(*rs_msg))
1053 idev = in6_dev_get(skb->dev);
1055 if (net_ratelimit())
1056 ND_PRINTK1("ICMP6 RS: can't find in6 device\n");
1060 /* Don't accept RS if we're not in router mode */
1061 if (!idev->cnf.forwarding)
1065 * Don't update NCE if src = ::;
1066 * this implies that the source node has no ip address assigned yet.
1068 if (ipv6_addr_any(saddr))
1071 /* Parse ND options */
1072 if (!ndisc_parse_options(rs_msg->opt, ndoptlen, &ndopts)) {
1073 if (net_ratelimit())
1074 ND_PRINTK2("ICMP6 NS: invalid ND option, ignored\n");
1078 if (ndopts.nd_opts_src_lladdr) {
1079 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr,
1085 neigh = __neigh_lookup(&nd_tbl, saddr, skb->dev, 1);
1087 neigh_update(neigh, lladdr, NUD_STALE,
1088 NEIGH_UPDATE_F_WEAK_OVERRIDE|
1089 NEIGH_UPDATE_F_OVERRIDE|
1090 NEIGH_UPDATE_F_OVERRIDE_ISROUTER);
1091 neigh_release(neigh);
1097 static void ndisc_router_discovery(struct sk_buff *skb)
1099 struct ra_msg *ra_msg = (struct ra_msg *) skb->h.raw;
1100 struct neighbour *neigh = NULL;
1101 struct inet6_dev *in6_dev;
1102 struct rt6_info *rt = NULL;
1104 struct ndisc_options ndopts;
1106 unsigned int pref = 0;
1108 __u8 * opt = (__u8 *)(ra_msg + 1);
1110 optlen = (skb->tail - skb->h.raw) - sizeof(struct ra_msg);
1112 if (!(ipv6_addr_type(&skb->nh.ipv6h->saddr) & IPV6_ADDR_LINKLOCAL)) {
1113 ND_PRINTK2(KERN_WARNING
1114 "ICMPv6 RA: source address is not link-local.\n");
1118 ND_PRINTK2(KERN_WARNING
1119 "ICMPv6 RA: packet too short\n");
1124 * set the RA_RECV flag in the interface
1127 in6_dev = in6_dev_get(skb->dev);
1128 if (in6_dev == NULL) {
1130 "ICMPv6 RA: can't find inet6 device for %s.\n",
1134 if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_ra) {
1135 in6_dev_put(in6_dev);
1139 if (!ndisc_parse_options(opt, optlen, &ndopts)) {
1140 in6_dev_put(in6_dev);
1141 ND_PRINTK2(KERN_WARNING
1142 "ICMP6 RA: invalid ND options\n");
1146 if (in6_dev->if_flags & IF_RS_SENT) {
1148 * flag that an RA was received after an RS was sent
1149 * out on this interface.
1151 in6_dev->if_flags |= IF_RA_RCVD;
1155 * Remember the managed/otherconf flags from most recently
1156 * received RA message (RFC 2462) -- yoshfuji
1158 in6_dev->if_flags = (in6_dev->if_flags & ~(IF_RA_MANAGED |
1160 (ra_msg->icmph.icmp6_addrconf_managed ?
1161 IF_RA_MANAGED : 0) |
1162 (ra_msg->icmph.icmp6_addrconf_other ?
1163 IF_RA_OTHERCONF : 0);
1165 if (!in6_dev->cnf.accept_ra_defrtr)
1168 lifetime = ntohs(ra_msg->icmph.icmp6_rt_lifetime);
1170 #ifdef CONFIG_IPV6_ROUTER_PREF
1171 pref = ra_msg->icmph.icmp6_router_pref;
1172 /* 10b is handled as if it were 00b (medium) */
1173 if (pref == ICMPV6_ROUTER_PREF_INVALID ||
1174 in6_dev->cnf.accept_ra_rtr_pref)
1175 pref = ICMPV6_ROUTER_PREF_MEDIUM;
1178 rt = rt6_get_dflt_router(&skb->nh.ipv6h->saddr, skb->dev);
1181 neigh = rt->rt6i_nexthop;
1183 if (rt && lifetime == 0) {
1189 if (rt == NULL && lifetime) {
1190 ND_PRINTK3(KERN_DEBUG
1191 "ICMPv6 RA: adding default router.\n");
1193 rt = rt6_add_dflt_router(&skb->nh.ipv6h->saddr, skb->dev, pref);
1196 "ICMPv6 RA: %s() failed to add default route.\n",
1198 in6_dev_put(in6_dev);
1202 neigh = rt->rt6i_nexthop;
1203 if (neigh == NULL) {
1205 "ICMPv6 RA: %s() got default router without neighbour.\n",
1207 dst_release(&rt->u.dst);
1208 in6_dev_put(in6_dev);
1211 neigh->flags |= NTF_ROUTER;
1213 rt->rt6i_flags |= (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
1217 rt->rt6i_expires = jiffies + (HZ * lifetime);
1219 if (ra_msg->icmph.icmp6_hop_limit) {
1220 in6_dev->cnf.hop_limit = ra_msg->icmph.icmp6_hop_limit;
1222 rt->u.dst.metrics[RTAX_HOPLIMIT-1] = ra_msg->icmph.icmp6_hop_limit;
1228 * Update Reachable Time and Retrans Timer
1231 if (in6_dev->nd_parms) {
1232 unsigned long rtime = ntohl(ra_msg->retrans_timer);
1234 if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/HZ) {
1235 rtime = (rtime*HZ)/1000;
1238 in6_dev->nd_parms->retrans_time = rtime;
1239 in6_dev->tstamp = jiffies;
1240 inet6_ifinfo_notify(RTM_NEWLINK, in6_dev);
1243 rtime = ntohl(ra_msg->reachable_time);
1244 if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/(3*HZ)) {
1245 rtime = (rtime*HZ)/1000;
1250 if (rtime != in6_dev->nd_parms->base_reachable_time) {
1251 in6_dev->nd_parms->base_reachable_time = rtime;
1252 in6_dev->nd_parms->gc_staletime = 3 * rtime;
1253 in6_dev->nd_parms->reachable_time = neigh_rand_reach_time(rtime);
1254 in6_dev->tstamp = jiffies;
1255 inet6_ifinfo_notify(RTM_NEWLINK, in6_dev);
1265 neigh = __neigh_lookup(&nd_tbl, &skb->nh.ipv6h->saddr,
1269 if (ndopts.nd_opts_src_lladdr) {
1270 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr,
1273 ND_PRINTK2(KERN_WARNING
1274 "ICMPv6 RA: invalid link-layer address length\n");
1278 neigh_update(neigh, lladdr, NUD_STALE,
1279 NEIGH_UPDATE_F_WEAK_OVERRIDE|
1280 NEIGH_UPDATE_F_OVERRIDE|
1281 NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
1282 NEIGH_UPDATE_F_ISROUTER);
1285 #ifdef CONFIG_IPV6_ROUTE_INFO
1286 if (in6_dev->cnf.accept_ra_rtr_pref && ndopts.nd_opts_ri) {
1287 struct nd_opt_hdr *p;
1288 for (p = ndopts.nd_opts_ri;
1290 p = ndisc_next_option(p, ndopts.nd_opts_ri_end)) {
1291 if (((struct route_info *)p)->prefix_len > in6_dev->cnf.accept_ra_rt_info_max_plen)
1293 rt6_route_rcv(skb->dev, (u8*)p, (p->nd_opt_len) << 3,
1294 &skb->nh.ipv6h->saddr);
1299 if (in6_dev->cnf.accept_ra_pinfo && ndopts.nd_opts_pi) {
1300 struct nd_opt_hdr *p;
1301 for (p = ndopts.nd_opts_pi;
1303 p = ndisc_next_option(p, ndopts.nd_opts_pi_end)) {
1304 addrconf_prefix_rcv(skb->dev, (u8*)p, (p->nd_opt_len) << 3);
1308 if (ndopts.nd_opts_mtu) {
1312 memcpy(&n, ((u8*)(ndopts.nd_opts_mtu+1))+2, sizeof(mtu));
1315 if (mtu < IPV6_MIN_MTU || mtu > skb->dev->mtu) {
1316 ND_PRINTK2(KERN_WARNING
1317 "ICMPv6 RA: invalid mtu: %d\n",
1319 } else if (in6_dev->cnf.mtu6 != mtu) {
1320 in6_dev->cnf.mtu6 = mtu;
1323 rt->u.dst.metrics[RTAX_MTU-1] = mtu;
1325 rt6_mtu_change(skb->dev, mtu);
1329 if (ndopts.nd_opts_tgt_lladdr || ndopts.nd_opts_rh) {
1330 ND_PRINTK2(KERN_WARNING
1331 "ICMPv6 RA: invalid RA options");
1335 dst_release(&rt->u.dst);
1337 neigh_release(neigh);
1338 in6_dev_put(in6_dev);
1341 static void ndisc_redirect_rcv(struct sk_buff *skb)
1343 struct inet6_dev *in6_dev;
1344 struct icmp6hdr *icmph;
1345 struct in6_addr *dest;
1346 struct in6_addr *target; /* new first hop to destination */
1347 struct neighbour *neigh;
1349 struct ndisc_options ndopts;
1353 if (!(ipv6_addr_type(&skb->nh.ipv6h->saddr) & IPV6_ADDR_LINKLOCAL)) {
1354 ND_PRINTK2(KERN_WARNING
1355 "ICMPv6 Redirect: source address is not link-local.\n");
1359 optlen = skb->tail - skb->h.raw;
1360 optlen -= sizeof(struct icmp6hdr) + 2 * sizeof(struct in6_addr);
1363 ND_PRINTK2(KERN_WARNING
1364 "ICMPv6 Redirect: packet too short\n");
1368 icmph = (struct icmp6hdr *) skb->h.raw;
1369 target = (struct in6_addr *) (icmph + 1);
1372 if (ipv6_addr_is_multicast(dest)) {
1373 ND_PRINTK2(KERN_WARNING
1374 "ICMPv6 Redirect: destination address is multicast.\n");
1378 if (ipv6_addr_equal(dest, target)) {
1380 } else if (!(ipv6_addr_type(target) & IPV6_ADDR_LINKLOCAL)) {
1381 ND_PRINTK2(KERN_WARNING
1382 "ICMPv6 Redirect: target address is not link-local.\n");
1386 in6_dev = in6_dev_get(skb->dev);
1389 if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects) {
1390 in6_dev_put(in6_dev);
1395 * The IP source address of the Redirect MUST be the same as the current
1396 * first-hop router for the specified ICMP Destination Address.
1399 if (!ndisc_parse_options((u8*)(dest + 1), optlen, &ndopts)) {
1400 ND_PRINTK2(KERN_WARNING
1401 "ICMPv6 Redirect: invalid ND options\n");
1402 in6_dev_put(in6_dev);
1405 if (ndopts.nd_opts_tgt_lladdr) {
1406 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr,
1409 ND_PRINTK2(KERN_WARNING
1410 "ICMPv6 Redirect: invalid link-layer address length\n");
1411 in6_dev_put(in6_dev);
1416 neigh = __neigh_lookup(&nd_tbl, target, skb->dev, 1);
1418 rt6_redirect(dest, &skb->nh.ipv6h->daddr,
1419 &skb->nh.ipv6h->saddr, neigh, lladdr,
1421 neigh_release(neigh);
1423 in6_dev_put(in6_dev);
1426 void ndisc_send_redirect(struct sk_buff *skb, struct neighbour *neigh,
1427 struct in6_addr *target)
1429 struct sock *sk = ndisc_socket->sk;
1430 int len = sizeof(struct icmp6hdr) + 2 * sizeof(struct in6_addr);
1431 struct sk_buff *buff;
1432 struct icmp6hdr *icmph;
1433 struct in6_addr saddr_buf;
1434 struct in6_addr *addrp;
1435 struct net_device *dev;
1436 struct rt6_info *rt;
1437 struct dst_entry *dst;
1438 struct inet6_dev *idev;
1444 u8 ha_buf[MAX_ADDR_LEN], *ha = NULL;
1448 if (ipv6_get_lladdr(dev, &saddr_buf, IFA_F_TENTATIVE)) {
1449 ND_PRINTK2(KERN_WARNING
1450 "ICMPv6 Redirect: no link-local address on %s\n",
1455 if (!ipv6_addr_equal(&skb->nh.ipv6h->daddr, target) &&
1456 !(ipv6_addr_type(target) & IPV6_ADDR_LINKLOCAL)) {
1457 ND_PRINTK2(KERN_WARNING
1458 "ICMPv6 Redirect: target address is not link-local.\n");
1462 ndisc_flow_init(&fl, NDISC_REDIRECT, &saddr_buf, &skb->nh.ipv6h->saddr,
1465 dst = ip6_route_output(NULL, &fl);
1469 err = xfrm_lookup(&dst, &fl, NULL, 0);
1473 rt = (struct rt6_info *) dst;
1475 if (rt->rt6i_flags & RTF_GATEWAY) {
1476 ND_PRINTK2(KERN_WARNING
1477 "ICMPv6 Redirect: destination is not a neighbour.\n");
1481 if (!xrlim_allow(dst, 1*HZ)) {
1486 if (dev->addr_len) {
1487 read_lock_bh(&neigh->lock);
1488 if (neigh->nud_state & NUD_VALID) {
1489 memcpy(ha_buf, neigh->ha, dev->addr_len);
1490 read_unlock_bh(&neigh->lock);
1492 len += ndisc_opt_addr_space(dev);
1494 read_unlock_bh(&neigh->lock);
1497 rd_len = min_t(unsigned int,
1498 IPV6_MIN_MTU-sizeof(struct ipv6hdr)-len, skb->len + 8);
1502 buff = sock_alloc_send_skb(sk,
1503 (MAX_HEADER + sizeof(struct ipv6hdr) +
1504 len + LL_RESERVED_SPACE(dev)),
1508 "ICMPv6 Redirect: %s() failed to allocate an skb.\n",
1516 skb_reserve(buff, LL_RESERVED_SPACE(dev));
1517 ip6_nd_hdr(sk, buff, dev, &saddr_buf, &skb->nh.ipv6h->saddr,
1518 IPPROTO_ICMPV6, len);
1520 icmph = (struct icmp6hdr *)skb_put(buff, len);
1521 buff->h.raw = (unsigned char*)icmph;
1523 memset(icmph, 0, sizeof(struct icmp6hdr));
1524 icmph->icmp6_type = NDISC_REDIRECT;
1527 * copy target and destination addresses
1530 addrp = (struct in6_addr *)(icmph + 1);
1531 ipv6_addr_copy(addrp, target);
1533 ipv6_addr_copy(addrp, &skb->nh.ipv6h->daddr);
1535 opt = (u8*) (addrp + 1);
1538 * include target_address option
1542 opt = ndisc_fill_addr_option(opt, ND_OPT_TARGET_LL_ADDR, ha,
1543 dev->addr_len, dev->type);
1546 * build redirect option and copy skb over to the new packet.
1550 *(opt++) = ND_OPT_REDIRECT_HDR;
1551 *(opt++) = (rd_len >> 3);
1554 memcpy(opt, skb->nh.ipv6h, rd_len - 8);
1556 icmph->icmp6_cksum = csum_ipv6_magic(&saddr_buf, &skb->nh.ipv6h->saddr,
1557 len, IPPROTO_ICMPV6,
1558 csum_partial((u8 *) icmph, len, 0));
1561 idev = in6_dev_get(dst->dev);
1562 IP6_INC_STATS(idev, IPSTATS_MIB_OUTREQUESTS);
1563 err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, buff, NULL, dst->dev, dst_output);
1565 ICMP6_INC_STATS(idev, ICMP6_MIB_OUTREDIRECTS);
1566 ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS);
1569 if (likely(idev != NULL))
1573 static void pndisc_redo(struct sk_buff *skb)
1579 int ndisc_rcv(struct sk_buff *skb)
1583 if (!pskb_may_pull(skb, skb->len))
1586 msg = (struct nd_msg *) skb->h.raw;
1588 __skb_push(skb, skb->data-skb->h.raw);
1590 if (skb->nh.ipv6h->hop_limit != 255) {
1591 ND_PRINTK2(KERN_WARNING
1592 "ICMPv6 NDISC: invalid hop-limit: %d\n",
1593 skb->nh.ipv6h->hop_limit);
1597 if (msg->icmph.icmp6_code != 0) {
1598 ND_PRINTK2(KERN_WARNING
1599 "ICMPv6 NDISC: invalid ICMPv6 code: %d\n",
1600 msg->icmph.icmp6_code);
1604 memset(NEIGH_CB(skb), 0, sizeof(struct neighbour_cb));
1606 switch (msg->icmph.icmp6_type) {
1607 case NDISC_NEIGHBOUR_SOLICITATION:
1611 case NDISC_NEIGHBOUR_ADVERTISEMENT:
1615 case NDISC_ROUTER_SOLICITATION:
1619 case NDISC_ROUTER_ADVERTISEMENT:
1620 ndisc_router_discovery(skb);
1623 case NDISC_REDIRECT:
1624 ndisc_redirect_rcv(skb);
1631 static int ndisc_netdev_event(struct notifier_block *this, unsigned long event, void *ptr)
1633 struct net_device *dev = ptr;
1636 case NETDEV_CHANGEADDR:
1637 neigh_changeaddr(&nd_tbl, dev);
1641 neigh_ifdown(&nd_tbl, dev);
1651 static struct notifier_block ndisc_netdev_notifier = {
1652 .notifier_call = ndisc_netdev_event,
1655 #ifdef CONFIG_SYSCTL
1656 static void ndisc_warn_deprecated_sysctl(struct ctl_table *ctl,
1657 const char *func, const char *dev_name)
1659 static char warncomm[TASK_COMM_LEN];
1661 if (strcmp(warncomm, current->comm) && warned < 5) {
1662 strcpy(warncomm, current->comm);
1664 "process `%s' is using deprecated sysctl (%s) "
1665 "net.ipv6.neigh.%s.%s; "
1666 "Use net.ipv6.neigh.%s.%s_ms "
1669 dev_name, ctl->procname,
1670 dev_name, ctl->procname);
1675 int ndisc_ifinfo_sysctl_change(struct ctl_table *ctl, int write, struct file * filp, void __user *buffer, size_t *lenp, loff_t *ppos)
1677 struct net_device *dev = ctl->extra1;
1678 struct inet6_dev *idev;
1681 if (ctl->ctl_name == NET_NEIGH_RETRANS_TIME ||
1682 ctl->ctl_name == NET_NEIGH_REACHABLE_TIME)
1683 ndisc_warn_deprecated_sysctl(ctl, "syscall", dev ? dev->name : "default");
1685 switch (ctl->ctl_name) {
1686 case NET_NEIGH_RETRANS_TIME:
1687 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
1689 case NET_NEIGH_REACHABLE_TIME:
1690 ret = proc_dointvec_jiffies(ctl, write,
1691 filp, buffer, lenp, ppos);
1693 case NET_NEIGH_RETRANS_TIME_MS:
1694 case NET_NEIGH_REACHABLE_TIME_MS:
1695 ret = proc_dointvec_ms_jiffies(ctl, write,
1696 filp, buffer, lenp, ppos);
1702 if (write && ret == 0 && dev && (idev = in6_dev_get(dev)) != NULL) {
1703 if (ctl->ctl_name == NET_NEIGH_REACHABLE_TIME ||
1704 ctl->ctl_name == NET_NEIGH_REACHABLE_TIME_MS)
1705 idev->nd_parms->reachable_time = neigh_rand_reach_time(idev->nd_parms->base_reachable_time);
1706 idev->tstamp = jiffies;
1707 inet6_ifinfo_notify(RTM_NEWLINK, idev);
1713 static int ndisc_ifinfo_sysctl_strategy(ctl_table *ctl, int __user *name,
1714 int nlen, void __user *oldval,
1715 size_t __user *oldlenp,
1716 void __user *newval, size_t newlen)
1718 struct net_device *dev = ctl->extra1;
1719 struct inet6_dev *idev;
1722 if (ctl->ctl_name == NET_NEIGH_RETRANS_TIME ||
1723 ctl->ctl_name == NET_NEIGH_REACHABLE_TIME)
1724 ndisc_warn_deprecated_sysctl(ctl, "procfs", dev ? dev->name : "default");
1726 switch (ctl->ctl_name) {
1727 case NET_NEIGH_REACHABLE_TIME:
1728 ret = sysctl_jiffies(ctl, name, nlen,
1729 oldval, oldlenp, newval, newlen);
1731 case NET_NEIGH_RETRANS_TIME_MS:
1732 case NET_NEIGH_REACHABLE_TIME_MS:
1733 ret = sysctl_ms_jiffies(ctl, name, nlen,
1734 oldval, oldlenp, newval, newlen);
1740 if (newval && newlen && ret > 0 &&
1741 dev && (idev = in6_dev_get(dev)) != NULL) {
1742 if (ctl->ctl_name == NET_NEIGH_REACHABLE_TIME ||
1743 ctl->ctl_name == NET_NEIGH_REACHABLE_TIME_MS)
1744 idev->nd_parms->reachable_time = neigh_rand_reach_time(idev->nd_parms->base_reachable_time);
1745 idev->tstamp = jiffies;
1746 inet6_ifinfo_notify(RTM_NEWLINK, idev);
1755 int __init ndisc_init(struct net_proto_family *ops)
1757 struct ipv6_pinfo *np;
1761 err = sock_create_kern(PF_INET6, SOCK_RAW, IPPROTO_ICMPV6, &ndisc_socket);
1764 "ICMPv6 NDISC: Failed to initialize the control socket (err %d).\n",
1766 ndisc_socket = NULL; /* For safety. */
1770 sk = ndisc_socket->sk;
1772 sk->sk_allocation = GFP_ATOMIC;
1773 np->hop_limit = 255;
1774 /* Do not loopback ndisc messages */
1776 sk->sk_prot->unhash(sk);
1779 * Initialize the neighbour table
1782 neigh_table_init(&nd_tbl);
1784 #ifdef CONFIG_SYSCTL
1785 neigh_sysctl_register(NULL, &nd_tbl.parms, NET_IPV6, NET_IPV6_NEIGH,
1787 &ndisc_ifinfo_sysctl_change,
1788 &ndisc_ifinfo_sysctl_strategy);
1791 register_netdevice_notifier(&ndisc_netdev_notifier);
1795 void ndisc_cleanup(void)
1797 unregister_netdevice_notifier(&ndisc_netdev_notifier);
1798 #ifdef CONFIG_SYSCTL
1799 neigh_sysctl_unregister(&nd_tbl.parms);
1801 neigh_table_clear(&nd_tbl);
1802 sock_release(ndisc_socket);
1803 ndisc_socket = NULL; /* For safety. */