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 * Pierre Ynard : export userland ND options
19 * through netlink (RDNSS support)
20 * Lars Fenneberg : fixed MTU setting on receipt
22 * Janos Farkas : kmalloc failure checks
23 * Alexey Kuznetsov : state machine reworked
24 * and moved to net/core.
25 * Pekka Savola : RFC2461 validation
26 * YOSHIFUJI Hideaki @USAGI : Verify ND options properly
29 /* Set to 3 to get tracing... */
32 #define ND_PRINTK(fmt, args...) do { if (net_ratelimit()) { printk(fmt, ## args); } } while(0)
33 #define ND_NOPRINTK(x...) do { ; } while(0)
34 #define ND_PRINTK0 ND_PRINTK
35 #define ND_PRINTK1 ND_NOPRINTK
36 #define ND_PRINTK2 ND_NOPRINTK
37 #define ND_PRINTK3 ND_NOPRINTK
40 #define ND_PRINTK1 ND_PRINTK
44 #define ND_PRINTK2 ND_PRINTK
48 #define ND_PRINTK3 ND_PRINTK
51 #include <linux/module.h>
52 #include <linux/errno.h>
53 #include <linux/types.h>
54 #include <linux/socket.h>
55 #include <linux/sockios.h>
56 #include <linux/sched.h>
57 #include <linux/net.h>
58 #include <linux/in6.h>
59 #include <linux/route.h>
60 #include <linux/init.h>
61 #include <linux/rcupdate.h>
63 #include <linux/sysctl.h>
66 #include <linux/if_addr.h>
67 #include <linux/if_arp.h>
68 #include <linux/ipv6.h>
69 #include <linux/icmpv6.h>
70 #include <linux/jhash.h>
76 #include <net/protocol.h>
77 #include <net/ndisc.h>
78 #include <net/ip6_route.h>
79 #include <net/addrconf.h>
82 #include <net/netlink.h>
83 #include <linux/rtnetlink.h>
86 #include <net/ip6_checksum.h>
87 #include <linux/proc_fs.h>
89 #include <linux/netfilter.h>
90 #include <linux/netfilter_ipv6.h>
92 static u32 ndisc_hash(const void *pkey, const struct net_device *dev);
93 static int ndisc_constructor(struct neighbour *neigh);
94 static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb);
95 static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb);
96 static int pndisc_constructor(struct pneigh_entry *n);
97 static void pndisc_destructor(struct pneigh_entry *n);
98 static void pndisc_redo(struct sk_buff *skb);
100 static struct neigh_ops ndisc_generic_ops = {
102 .solicit = ndisc_solicit,
103 .error_report = ndisc_error_report,
104 .output = neigh_resolve_output,
105 .connected_output = neigh_connected_output,
106 .hh_output = dev_queue_xmit,
107 .queue_xmit = dev_queue_xmit,
110 static struct neigh_ops ndisc_hh_ops = {
112 .solicit = ndisc_solicit,
113 .error_report = ndisc_error_report,
114 .output = neigh_resolve_output,
115 .connected_output = neigh_resolve_output,
116 .hh_output = dev_queue_xmit,
117 .queue_xmit = dev_queue_xmit,
121 static struct neigh_ops ndisc_direct_ops = {
123 .output = dev_queue_xmit,
124 .connected_output = dev_queue_xmit,
125 .hh_output = dev_queue_xmit,
126 .queue_xmit = dev_queue_xmit,
129 struct neigh_table nd_tbl = {
131 .entry_size = sizeof(struct neighbour) + sizeof(struct in6_addr),
132 .key_len = sizeof(struct in6_addr),
134 .constructor = ndisc_constructor,
135 .pconstructor = pndisc_constructor,
136 .pdestructor = pndisc_destructor,
137 .proxy_redo = pndisc_redo,
141 .base_reachable_time = 30 * HZ,
142 .retrans_time = 1 * HZ,
143 .gc_staletime = 60 * HZ,
144 .reachable_time = 30 * HZ,
145 .delay_probe_time = 5 * HZ,
149 .anycast_delay = 1 * HZ,
150 .proxy_delay = (8 * HZ) / 10,
153 .gc_interval = 30 * HZ,
160 struct ndisc_options {
161 struct nd_opt_hdr *nd_opt_array[__ND_OPT_ARRAY_MAX];
162 #ifdef CONFIG_IPV6_ROUTE_INFO
163 struct nd_opt_hdr *nd_opts_ri;
164 struct nd_opt_hdr *nd_opts_ri_end;
166 struct nd_opt_hdr *nd_useropts;
167 struct nd_opt_hdr *nd_useropts_end;
170 #define nd_opts_src_lladdr nd_opt_array[ND_OPT_SOURCE_LL_ADDR]
171 #define nd_opts_tgt_lladdr nd_opt_array[ND_OPT_TARGET_LL_ADDR]
172 #define nd_opts_pi nd_opt_array[ND_OPT_PREFIX_INFO]
173 #define nd_opts_pi_end nd_opt_array[__ND_OPT_PREFIX_INFO_END]
174 #define nd_opts_rh nd_opt_array[ND_OPT_REDIRECT_HDR]
175 #define nd_opts_mtu nd_opt_array[ND_OPT_MTU]
177 #define NDISC_OPT_SPACE(len) (((len)+2+7)&~7)
180 * Return the padding between the option length and the start of the
181 * link addr. Currently only IP-over-InfiniBand needs this, although
182 * if RFC 3831 IPv6-over-Fibre Channel is ever implemented it may
183 * also need a pad of 2.
185 static int ndisc_addr_option_pad(unsigned short type)
188 case ARPHRD_INFINIBAND: return 2;
193 static inline int ndisc_opt_addr_space(struct net_device *dev)
195 return NDISC_OPT_SPACE(dev->addr_len + ndisc_addr_option_pad(dev->type));
198 static u8 *ndisc_fill_addr_option(u8 *opt, int type, void *data, int data_len,
199 unsigned short addr_type)
201 int space = NDISC_OPT_SPACE(data_len);
202 int pad = ndisc_addr_option_pad(addr_type);
207 memset(opt + 2, 0, pad);
211 memcpy(opt+2, data, data_len);
214 if ((space -= data_len) > 0)
215 memset(opt, 0, space);
219 static struct nd_opt_hdr *ndisc_next_option(struct nd_opt_hdr *cur,
220 struct nd_opt_hdr *end)
223 if (!cur || !end || cur >= end)
225 type = cur->nd_opt_type;
227 cur = ((void *)cur) + (cur->nd_opt_len << 3);
228 } while(cur < end && cur->nd_opt_type != type);
229 return (cur <= end && cur->nd_opt_type == type ? cur : NULL);
232 static inline int ndisc_is_useropt(struct nd_opt_hdr *opt)
234 return (opt->nd_opt_type == ND_OPT_RDNSS);
237 static struct nd_opt_hdr *ndisc_next_useropt(struct nd_opt_hdr *cur,
238 struct nd_opt_hdr *end)
240 if (!cur || !end || cur >= end)
243 cur = ((void *)cur) + (cur->nd_opt_len << 3);
244 } while(cur < end && !ndisc_is_useropt(cur));
245 return (cur <= end && ndisc_is_useropt(cur) ? cur : NULL);
248 static struct ndisc_options *ndisc_parse_options(u8 *opt, int opt_len,
249 struct ndisc_options *ndopts)
251 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)opt;
253 if (!nd_opt || opt_len < 0 || !ndopts)
255 memset(ndopts, 0, sizeof(*ndopts));
258 if (opt_len < sizeof(struct nd_opt_hdr))
260 l = nd_opt->nd_opt_len << 3;
261 if (opt_len < l || l == 0)
263 switch (nd_opt->nd_opt_type) {
264 case ND_OPT_SOURCE_LL_ADDR:
265 case ND_OPT_TARGET_LL_ADDR:
267 case ND_OPT_REDIRECT_HDR:
268 if (ndopts->nd_opt_array[nd_opt->nd_opt_type]) {
269 ND_PRINTK2(KERN_WARNING
270 "%s(): duplicated ND6 option found: type=%d\n",
272 nd_opt->nd_opt_type);
274 ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt;
277 case ND_OPT_PREFIX_INFO:
278 ndopts->nd_opts_pi_end = nd_opt;
279 if (!ndopts->nd_opt_array[nd_opt->nd_opt_type])
280 ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt;
282 #ifdef CONFIG_IPV6_ROUTE_INFO
283 case ND_OPT_ROUTE_INFO:
284 ndopts->nd_opts_ri_end = nd_opt;
285 if (!ndopts->nd_opts_ri)
286 ndopts->nd_opts_ri = nd_opt;
290 if (ndisc_is_useropt(nd_opt)) {
291 ndopts->nd_useropts_end = nd_opt;
292 if (!ndopts->nd_useropts)
293 ndopts->nd_useropts = nd_opt;
296 * Unknown options must be silently ignored,
297 * to accommodate future extension to the
300 ND_PRINTK2(KERN_NOTICE
301 "%s(): ignored unsupported option; type=%d, len=%d\n",
303 nd_opt->nd_opt_type, nd_opt->nd_opt_len);
307 nd_opt = ((void *)nd_opt) + l;
312 static inline u8 *ndisc_opt_addr_data(struct nd_opt_hdr *p,
313 struct net_device *dev)
315 u8 *lladdr = (u8 *)(p + 1);
316 int lladdrlen = p->nd_opt_len << 3;
317 int prepad = ndisc_addr_option_pad(dev->type);
318 if (lladdrlen != NDISC_OPT_SPACE(dev->addr_len + prepad))
320 return (lladdr + prepad);
323 int ndisc_mc_map(struct in6_addr *addr, char *buf, struct net_device *dev, int dir)
327 case ARPHRD_IEEE802: /* Not sure. Check it later. --ANK */
329 ipv6_eth_mc_map(addr, buf);
331 case ARPHRD_IEEE802_TR:
332 ipv6_tr_mc_map(addr,buf);
335 ipv6_arcnet_mc_map(addr, buf);
337 case ARPHRD_INFINIBAND:
338 ipv6_ib_mc_map(addr, dev->broadcast, buf);
342 memcpy(buf, dev->broadcast, dev->addr_len);
349 EXPORT_SYMBOL(ndisc_mc_map);
351 static u32 ndisc_hash(const void *pkey, const struct net_device *dev)
353 const u32 *p32 = pkey;
357 for (i = 0; i < (sizeof(struct in6_addr) / sizeof(u32)); i++)
360 return jhash_2words(addr_hash, dev->ifindex, nd_tbl.hash_rnd);
363 static int ndisc_constructor(struct neighbour *neigh)
365 struct in6_addr *addr = (struct in6_addr*)&neigh->primary_key;
366 struct net_device *dev = neigh->dev;
367 struct inet6_dev *in6_dev;
368 struct neigh_parms *parms;
369 int is_multicast = ipv6_addr_is_multicast(addr);
372 in6_dev = in6_dev_get(dev);
373 if (in6_dev == NULL) {
378 parms = in6_dev->nd_parms;
379 __neigh_parms_put(neigh->parms);
380 neigh->parms = neigh_parms_clone(parms);
383 neigh->type = is_multicast ? RTN_MULTICAST : RTN_UNICAST;
384 if (!dev->header_ops) {
385 neigh->nud_state = NUD_NOARP;
386 neigh->ops = &ndisc_direct_ops;
387 neigh->output = neigh->ops->queue_xmit;
390 neigh->nud_state = NUD_NOARP;
391 ndisc_mc_map(addr, neigh->ha, dev, 1);
392 } else if (dev->flags&(IFF_NOARP|IFF_LOOPBACK)) {
393 neigh->nud_state = NUD_NOARP;
394 memcpy(neigh->ha, dev->dev_addr, dev->addr_len);
395 if (dev->flags&IFF_LOOPBACK)
396 neigh->type = RTN_LOCAL;
397 } else if (dev->flags&IFF_POINTOPOINT) {
398 neigh->nud_state = NUD_NOARP;
399 memcpy(neigh->ha, dev->broadcast, dev->addr_len);
401 if (dev->header_ops->cache)
402 neigh->ops = &ndisc_hh_ops;
404 neigh->ops = &ndisc_generic_ops;
405 if (neigh->nud_state&NUD_VALID)
406 neigh->output = neigh->ops->connected_output;
408 neigh->output = neigh->ops->output;
410 in6_dev_put(in6_dev);
414 static int pndisc_constructor(struct pneigh_entry *n)
416 struct in6_addr *addr = (struct in6_addr*)&n->key;
417 struct in6_addr maddr;
418 struct net_device *dev = n->dev;
420 if (dev == NULL || __in6_dev_get(dev) == NULL)
422 addrconf_addr_solict_mult(addr, &maddr);
423 ipv6_dev_mc_inc(dev, &maddr);
427 static void pndisc_destructor(struct pneigh_entry *n)
429 struct in6_addr *addr = (struct in6_addr*)&n->key;
430 struct in6_addr maddr;
431 struct net_device *dev = n->dev;
433 if (dev == NULL || __in6_dev_get(dev) == NULL)
435 addrconf_addr_solict_mult(addr, &maddr);
436 ipv6_dev_mc_dec(dev, &maddr);
440 * Send a Neighbour Advertisement
442 static void __ndisc_send(struct net_device *dev,
443 struct neighbour *neigh,
444 struct in6_addr *daddr, struct in6_addr *saddr,
445 struct icmp6hdr *icmp6h, struct in6_addr *target,
449 struct dst_entry *dst;
450 struct net *net = dev_net(dev);
451 struct sock *sk = net->ipv6.ndisc_sk;
453 struct icmp6hdr *hdr;
454 struct inet6_dev *idev;
459 type = icmp6h->icmp6_type;
461 icmpv6_flow_init(sk, &fl, type, saddr, daddr, dev->ifindex);
463 dst = icmp6_dst_alloc(dev, neigh, daddr);
467 err = xfrm_lookup(&dst, &fl, NULL, 0);
474 len = sizeof(struct icmp6hdr) + (target ? sizeof(*target) : 0);
476 len += ndisc_opt_addr_space(dev);
478 skb = sock_alloc_send_skb(sk,
479 (MAX_HEADER + sizeof(struct ipv6hdr) +
480 len + LL_RESERVED_SPACE(dev)),
484 "ICMPv6 ND: %s() failed to allocate an skb.\n",
490 skb_reserve(skb, LL_RESERVED_SPACE(dev));
491 ip6_nd_hdr(sk, skb, dev, saddr, daddr, IPPROTO_ICMPV6, len);
493 skb->transport_header = skb->tail;
496 hdr = (struct icmp6hdr *)skb_transport_header(skb);
497 memcpy(hdr, icmp6h, sizeof(*hdr));
499 opt = skb_transport_header(skb) + sizeof(struct icmp6hdr);
501 ipv6_addr_copy((struct in6_addr *)opt, target);
502 opt += sizeof(*target);
506 ndisc_fill_addr_option(opt, llinfo, dev->dev_addr,
507 dev->addr_len, dev->type);
509 hdr->icmp6_cksum = csum_ipv6_magic(saddr, daddr, len,
511 csum_partial((__u8 *) hdr,
516 idev = in6_dev_get(dst->dev);
517 IP6_INC_STATS(idev, IPSTATS_MIB_OUTREQUESTS);
519 err = NF_HOOK(PF_INET6, NF_INET_LOCAL_OUT, skb, NULL, dst->dev,
522 ICMP6MSGOUT_INC_STATS(idev, type);
523 ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS);
526 if (likely(idev != NULL))
530 static void ndisc_send_na(struct net_device *dev, struct neighbour *neigh,
531 struct in6_addr *daddr, struct in6_addr *solicited_addr,
532 int router, int solicited, int override, int inc_opt)
534 struct in6_addr tmpaddr;
535 struct inet6_ifaddr *ifp;
536 struct in6_addr *src_addr;
537 struct icmp6hdr icmp6h = {
538 .icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT,
541 /* for anycast or proxy, solicited_addr != src_addr */
542 ifp = ipv6_get_ifaddr(dev_net(dev), solicited_addr, dev, 1);
544 src_addr = solicited_addr;
545 if (ifp->flags & IFA_F_OPTIMISTIC)
549 if (ipv6_dev_get_saddr(dev, daddr,
550 inet6_sk(dev_net(dev)->ipv6.ndisc_sk)->srcprefs,
556 icmp6h.icmp6_router = router;
557 icmp6h.icmp6_solicited = solicited;
558 icmp6h.icmp6_override = override;
560 __ndisc_send(dev, neigh, daddr, src_addr,
561 &icmp6h, solicited_addr,
562 inc_opt ? ND_OPT_TARGET_LL_ADDR : 0);
565 void ndisc_send_ns(struct net_device *dev, struct neighbour *neigh,
566 struct in6_addr *solicit,
567 struct in6_addr *daddr, struct in6_addr *saddr)
569 struct in6_addr addr_buf;
570 struct icmp6hdr icmp6h = {
571 .icmp6_type = NDISC_NEIGHBOUR_SOLICITATION,
575 if (ipv6_get_lladdr(dev, &addr_buf,
576 (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC)))
581 __ndisc_send(dev, neigh, daddr, saddr,
583 !ipv6_addr_any(saddr) ? ND_OPT_SOURCE_LL_ADDR : 0);
586 void ndisc_send_rs(struct net_device *dev, struct in6_addr *saddr,
587 struct in6_addr *daddr)
589 struct icmp6hdr icmp6h = {
590 .icmp6_type = NDISC_ROUTER_SOLICITATION,
592 int send_sllao = dev->addr_len;
594 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
596 * According to section 2.2 of RFC 4429, we must not
597 * send router solicitations with a sllao from
598 * optimistic addresses, but we may send the solicitation
599 * if we don't include the sllao. So here we check
600 * if our address is optimistic, and if so, we
601 * suppress the inclusion of the sllao.
604 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(dev_net(dev), saddr,
607 if (ifp->flags & IFA_F_OPTIMISTIC) {
616 __ndisc_send(dev, NULL, daddr, saddr,
618 send_sllao ? ND_OPT_SOURCE_LL_ADDR : 0);
622 static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb)
625 * "The sender MUST return an ICMP
626 * destination unreachable"
628 dst_link_failure(skb);
632 /* Called with locked neigh: either read or both */
634 static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb)
636 struct in6_addr *saddr = NULL;
637 struct in6_addr mcaddr;
638 struct net_device *dev = neigh->dev;
639 struct in6_addr *target = (struct in6_addr *)&neigh->primary_key;
640 int probes = atomic_read(&neigh->probes);
642 if (skb && ipv6_chk_addr(dev_net(dev), &ipv6_hdr(skb)->saddr, dev, 1))
643 saddr = &ipv6_hdr(skb)->saddr;
645 if ((probes -= neigh->parms->ucast_probes) < 0) {
646 if (!(neigh->nud_state & NUD_VALID)) {
647 ND_PRINTK1(KERN_DEBUG
648 "%s(): trying to ucast probe in NUD_INVALID: "
653 ndisc_send_ns(dev, neigh, target, target, saddr);
654 } else if ((probes -= neigh->parms->app_probes) < 0) {
659 addrconf_addr_solict_mult(target, &mcaddr);
660 ndisc_send_ns(dev, NULL, target, &mcaddr, saddr);
664 static int pndisc_is_router(const void *pkey,
665 struct net_device *dev)
667 struct pneigh_entry *n;
670 read_lock_bh(&nd_tbl.lock);
671 n = __pneigh_lookup(&nd_tbl, dev_net(dev), pkey, dev);
673 ret = !!(n->flags & NTF_ROUTER);
674 read_unlock_bh(&nd_tbl.lock);
679 static void ndisc_recv_ns(struct sk_buff *skb)
681 struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb);
682 struct in6_addr *saddr = &ipv6_hdr(skb)->saddr;
683 struct in6_addr *daddr = &ipv6_hdr(skb)->daddr;
685 u32 ndoptlen = skb->tail - (skb->transport_header +
686 offsetof(struct nd_msg, opt));
687 struct ndisc_options ndopts;
688 struct net_device *dev = skb->dev;
689 struct inet6_ifaddr *ifp;
690 struct inet6_dev *idev = NULL;
691 struct neighbour *neigh;
692 int dad = ipv6_addr_any(saddr);
696 if (ipv6_addr_is_multicast(&msg->target)) {
697 ND_PRINTK2(KERN_WARNING
698 "ICMPv6 NS: multicast target address");
704 * DAD has to be destined for solicited node multicast address.
707 !(daddr->s6_addr32[0] == htonl(0xff020000) &&
708 daddr->s6_addr32[1] == htonl(0x00000000) &&
709 daddr->s6_addr32[2] == htonl(0x00000001) &&
710 daddr->s6_addr [12] == 0xff )) {
711 ND_PRINTK2(KERN_WARNING
712 "ICMPv6 NS: bad DAD packet (wrong destination)\n");
716 if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) {
717 ND_PRINTK2(KERN_WARNING
718 "ICMPv6 NS: invalid ND options\n");
722 if (ndopts.nd_opts_src_lladdr) {
723 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, dev);
725 ND_PRINTK2(KERN_WARNING
726 "ICMPv6 NS: invalid link-layer address length\n");
731 * If the IP source address is the unspecified address,
732 * there MUST NOT be source link-layer address option
736 ND_PRINTK2(KERN_WARNING
737 "ICMPv6 NS: bad DAD packet (link-layer address option)\n");
742 inc = ipv6_addr_is_multicast(daddr);
744 ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1);
747 if (ifp->flags & (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC)) {
749 if (dev->type == ARPHRD_IEEE802_TR) {
750 const unsigned char *sadr;
751 sadr = skb_mac_header(skb);
752 if (((sadr[8] ^ dev->dev_addr[0]) & 0x7f) == 0 &&
753 sadr[9] == dev->dev_addr[1] &&
754 sadr[10] == dev->dev_addr[2] &&
755 sadr[11] == dev->dev_addr[3] &&
756 sadr[12] == dev->dev_addr[4] &&
757 sadr[13] == dev->dev_addr[5]) {
758 /* looped-back to us */
764 * We are colliding with another node
766 * so fail our DAD process
768 addrconf_dad_failure(ifp);
772 * This is not a dad solicitation.
773 * If we are an optimistic node,
775 * Otherwise, we should ignore it.
777 if (!(ifp->flags & IFA_F_OPTIMISTIC))
784 idev = in6_dev_get(dev);
786 /* XXX: count this drop? */
790 if (ipv6_chk_acast_addr(dev_net(dev), dev, &msg->target) ||
791 (idev->cnf.forwarding &&
792 (ipv6_devconf.proxy_ndp || idev->cnf.proxy_ndp) &&
793 (is_router = pndisc_is_router(&msg->target, dev)) >= 0)) {
794 if (!(NEIGH_CB(skb)->flags & LOCALLY_ENQUEUED) &&
795 skb->pkt_type != PACKET_HOST &&
797 idev->nd_parms->proxy_delay != 0) {
799 * for anycast or proxy,
800 * sender should delay its response
801 * by a random time between 0 and
802 * MAX_ANYCAST_DELAY_TIME seconds.
803 * (RFC2461) -- yoshfuji
805 struct sk_buff *n = skb_clone(skb, GFP_ATOMIC);
807 pneigh_enqueue(&nd_tbl, idev->nd_parms, n);
815 is_router = !!idev->cnf.forwarding;
818 struct in6_addr maddr;
820 ipv6_addr_all_nodes(&maddr);
821 ndisc_send_na(dev, NULL, &maddr, &msg->target,
822 is_router, 0, (ifp != NULL), 1);
827 NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_mcast);
829 NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_ucast);
832 * update / create cache entry
833 * for the source address
835 neigh = __neigh_lookup(&nd_tbl, saddr, dev,
836 !inc || lladdr || !dev->addr_len);
838 neigh_update(neigh, lladdr, NUD_STALE,
839 NEIGH_UPDATE_F_WEAK_OVERRIDE|
840 NEIGH_UPDATE_F_OVERRIDE);
841 if (neigh || !dev->header_ops) {
842 ndisc_send_na(dev, neigh, saddr, &msg->target,
844 1, (ifp != NULL && inc), inc);
846 neigh_release(neigh);
858 static void ndisc_recv_na(struct sk_buff *skb)
860 struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb);
861 struct in6_addr *saddr = &ipv6_hdr(skb)->saddr;
862 struct in6_addr *daddr = &ipv6_hdr(skb)->daddr;
864 u32 ndoptlen = skb->tail - (skb->transport_header +
865 offsetof(struct nd_msg, opt));
866 struct ndisc_options ndopts;
867 struct net_device *dev = skb->dev;
868 struct inet6_ifaddr *ifp;
869 struct neighbour *neigh;
871 if (skb->len < sizeof(struct nd_msg)) {
872 ND_PRINTK2(KERN_WARNING
873 "ICMPv6 NA: packet too short\n");
877 if (ipv6_addr_is_multicast(&msg->target)) {
878 ND_PRINTK2(KERN_WARNING
879 "ICMPv6 NA: target address is multicast.\n");
883 if (ipv6_addr_is_multicast(daddr) &&
884 msg->icmph.icmp6_solicited) {
885 ND_PRINTK2(KERN_WARNING
886 "ICMPv6 NA: solicited NA is multicasted.\n");
890 if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) {
891 ND_PRINTK2(KERN_WARNING
892 "ICMPv6 NS: invalid ND option\n");
895 if (ndopts.nd_opts_tgt_lladdr) {
896 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, dev);
898 ND_PRINTK2(KERN_WARNING
899 "ICMPv6 NA: invalid link-layer address length\n");
903 ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1);
905 if (ifp->flags & IFA_F_TENTATIVE) {
906 addrconf_dad_failure(ifp);
909 /* What should we make now? The advertisement
910 is invalid, but ndisc specs say nothing
911 about it. It could be misconfiguration, or
912 an smart proxy agent tries to help us :-)
914 ND_PRINTK1(KERN_WARNING
915 "ICMPv6 NA: someone advertises our address on %s!\n",
916 ifp->idev->dev->name);
920 neigh = neigh_lookup(&nd_tbl, &msg->target, dev);
923 u8 old_flags = neigh->flags;
925 if (neigh->nud_state & NUD_FAILED)
929 * Don't update the neighbor cache entry on a proxy NA from
930 * ourselves because either the proxied node is off link or it
931 * has already sent a NA to us.
933 if (lladdr && !memcmp(lladdr, dev->dev_addr, dev->addr_len) &&
934 ipv6_devconf.forwarding && ipv6_devconf.proxy_ndp &&
935 pneigh_lookup(&nd_tbl, dev_net(dev), &msg->target, dev, 0)) {
936 /* XXX: idev->cnf.prixy_ndp */
940 neigh_update(neigh, lladdr,
941 msg->icmph.icmp6_solicited ? NUD_REACHABLE : NUD_STALE,
942 NEIGH_UPDATE_F_WEAK_OVERRIDE|
943 (msg->icmph.icmp6_override ? NEIGH_UPDATE_F_OVERRIDE : 0)|
944 NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
945 (msg->icmph.icmp6_router ? NEIGH_UPDATE_F_ISROUTER : 0));
947 if ((old_flags & ~neigh->flags) & NTF_ROUTER) {
949 * Change: router to host
952 rt = rt6_get_dflt_router(saddr, dev);
958 neigh_release(neigh);
962 static void ndisc_recv_rs(struct sk_buff *skb)
964 struct rs_msg *rs_msg = (struct rs_msg *)skb_transport_header(skb);
965 unsigned long ndoptlen = skb->len - sizeof(*rs_msg);
966 struct neighbour *neigh;
967 struct inet6_dev *idev;
968 struct in6_addr *saddr = &ipv6_hdr(skb)->saddr;
969 struct ndisc_options ndopts;
972 if (skb->len < sizeof(*rs_msg))
975 idev = in6_dev_get(skb->dev);
978 ND_PRINTK1("ICMP6 RS: can't find in6 device\n");
982 /* Don't accept RS if we're not in router mode */
983 if (!idev->cnf.forwarding)
987 * Don't update NCE if src = ::;
988 * this implies that the source node has no ip address assigned yet.
990 if (ipv6_addr_any(saddr))
993 /* Parse ND options */
994 if (!ndisc_parse_options(rs_msg->opt, ndoptlen, &ndopts)) {
996 ND_PRINTK2("ICMP6 NS: invalid ND option, ignored\n");
1000 if (ndopts.nd_opts_src_lladdr) {
1001 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr,
1007 neigh = __neigh_lookup(&nd_tbl, saddr, skb->dev, 1);
1009 neigh_update(neigh, lladdr, NUD_STALE,
1010 NEIGH_UPDATE_F_WEAK_OVERRIDE|
1011 NEIGH_UPDATE_F_OVERRIDE|
1012 NEIGH_UPDATE_F_OVERRIDE_ISROUTER);
1013 neigh_release(neigh);
1019 static void ndisc_ra_useropt(struct sk_buff *ra, struct nd_opt_hdr *opt)
1021 struct icmp6hdr *icmp6h = (struct icmp6hdr *)skb_transport_header(ra);
1022 struct sk_buff *skb;
1023 struct nlmsghdr *nlh;
1024 struct nduseroptmsg *ndmsg;
1025 struct net *net = dev_net(ra->dev);
1027 int base_size = NLMSG_ALIGN(sizeof(struct nduseroptmsg)
1028 + (opt->nd_opt_len << 3));
1029 size_t msg_size = base_size + nla_total_size(sizeof(struct in6_addr));
1031 skb = nlmsg_new(msg_size, GFP_ATOMIC);
1037 nlh = nlmsg_put(skb, 0, 0, RTM_NEWNDUSEROPT, base_size, 0);
1039 goto nla_put_failure;
1042 ndmsg = nlmsg_data(nlh);
1043 ndmsg->nduseropt_family = AF_INET6;
1044 ndmsg->nduseropt_ifindex = ra->dev->ifindex;
1045 ndmsg->nduseropt_icmp_type = icmp6h->icmp6_type;
1046 ndmsg->nduseropt_icmp_code = icmp6h->icmp6_code;
1047 ndmsg->nduseropt_opts_len = opt->nd_opt_len << 3;
1049 memcpy(ndmsg + 1, opt, opt->nd_opt_len << 3);
1051 NLA_PUT(skb, NDUSEROPT_SRCADDR, sizeof(struct in6_addr),
1052 &ipv6_hdr(ra)->saddr);
1053 nlmsg_end(skb, nlh);
1055 err = rtnl_notify(skb, net, 0, RTNLGRP_ND_USEROPT, NULL,
1066 rtnl_set_sk_err(net, RTNLGRP_ND_USEROPT, err);
1069 static void ndisc_router_discovery(struct sk_buff *skb)
1071 struct ra_msg *ra_msg = (struct ra_msg *)skb_transport_header(skb);
1072 struct neighbour *neigh = NULL;
1073 struct inet6_dev *in6_dev;
1074 struct rt6_info *rt = NULL;
1076 struct ndisc_options ndopts;
1078 unsigned int pref = 0;
1080 __u8 * opt = (__u8 *)(ra_msg + 1);
1082 optlen = (skb->tail - skb->transport_header) - sizeof(struct ra_msg);
1084 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) {
1085 ND_PRINTK2(KERN_WARNING
1086 "ICMPv6 RA: source address is not link-local.\n");
1090 ND_PRINTK2(KERN_WARNING
1091 "ICMPv6 RA: packet too short\n");
1096 * set the RA_RECV flag in the interface
1099 in6_dev = in6_dev_get(skb->dev);
1100 if (in6_dev == NULL) {
1102 "ICMPv6 RA: can't find inet6 device for %s.\n",
1106 if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_ra) {
1107 in6_dev_put(in6_dev);
1111 if (!ndisc_parse_options(opt, optlen, &ndopts)) {
1112 in6_dev_put(in6_dev);
1113 ND_PRINTK2(KERN_WARNING
1114 "ICMP6 RA: invalid ND options\n");
1118 if (in6_dev->if_flags & IF_RS_SENT) {
1120 * flag that an RA was received after an RS was sent
1121 * out on this interface.
1123 in6_dev->if_flags |= IF_RA_RCVD;
1127 * Remember the managed/otherconf flags from most recently
1128 * received RA message (RFC 2462) -- yoshfuji
1130 in6_dev->if_flags = (in6_dev->if_flags & ~(IF_RA_MANAGED |
1132 (ra_msg->icmph.icmp6_addrconf_managed ?
1133 IF_RA_MANAGED : 0) |
1134 (ra_msg->icmph.icmp6_addrconf_other ?
1135 IF_RA_OTHERCONF : 0);
1137 if (!in6_dev->cnf.accept_ra_defrtr)
1140 lifetime = ntohs(ra_msg->icmph.icmp6_rt_lifetime);
1142 #ifdef CONFIG_IPV6_ROUTER_PREF
1143 pref = ra_msg->icmph.icmp6_router_pref;
1144 /* 10b is handled as if it were 00b (medium) */
1145 if (pref == ICMPV6_ROUTER_PREF_INVALID ||
1146 !in6_dev->cnf.accept_ra_rtr_pref)
1147 pref = ICMPV6_ROUTER_PREF_MEDIUM;
1150 rt = rt6_get_dflt_router(&ipv6_hdr(skb)->saddr, skb->dev);
1153 neigh = rt->rt6i_nexthop;
1155 if (rt && lifetime == 0) {
1161 if (rt == NULL && lifetime) {
1162 ND_PRINTK3(KERN_DEBUG
1163 "ICMPv6 RA: adding default router.\n");
1165 rt = rt6_add_dflt_router(&ipv6_hdr(skb)->saddr, skb->dev, pref);
1168 "ICMPv6 RA: %s() failed to add default route.\n",
1170 in6_dev_put(in6_dev);
1174 neigh = rt->rt6i_nexthop;
1175 if (neigh == NULL) {
1177 "ICMPv6 RA: %s() got default router without neighbour.\n",
1179 dst_release(&rt->u.dst);
1180 in6_dev_put(in6_dev);
1183 neigh->flags |= NTF_ROUTER;
1185 rt->rt6i_flags |= (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
1189 rt->rt6i_expires = jiffies + (HZ * lifetime);
1191 if (ra_msg->icmph.icmp6_hop_limit) {
1192 in6_dev->cnf.hop_limit = ra_msg->icmph.icmp6_hop_limit;
1194 rt->u.dst.metrics[RTAX_HOPLIMIT-1] = ra_msg->icmph.icmp6_hop_limit;
1200 * Update Reachable Time and Retrans Timer
1203 if (in6_dev->nd_parms) {
1204 unsigned long rtime = ntohl(ra_msg->retrans_timer);
1206 if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/HZ) {
1207 rtime = (rtime*HZ)/1000;
1210 in6_dev->nd_parms->retrans_time = rtime;
1211 in6_dev->tstamp = jiffies;
1212 inet6_ifinfo_notify(RTM_NEWLINK, in6_dev);
1215 rtime = ntohl(ra_msg->reachable_time);
1216 if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/(3*HZ)) {
1217 rtime = (rtime*HZ)/1000;
1222 if (rtime != in6_dev->nd_parms->base_reachable_time) {
1223 in6_dev->nd_parms->base_reachable_time = rtime;
1224 in6_dev->nd_parms->gc_staletime = 3 * rtime;
1225 in6_dev->nd_parms->reachable_time = neigh_rand_reach_time(rtime);
1226 in6_dev->tstamp = jiffies;
1227 inet6_ifinfo_notify(RTM_NEWLINK, in6_dev);
1237 neigh = __neigh_lookup(&nd_tbl, &ipv6_hdr(skb)->saddr,
1241 if (ndopts.nd_opts_src_lladdr) {
1242 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr,
1245 ND_PRINTK2(KERN_WARNING
1246 "ICMPv6 RA: invalid link-layer address length\n");
1250 neigh_update(neigh, lladdr, NUD_STALE,
1251 NEIGH_UPDATE_F_WEAK_OVERRIDE|
1252 NEIGH_UPDATE_F_OVERRIDE|
1253 NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
1254 NEIGH_UPDATE_F_ISROUTER);
1257 #ifdef CONFIG_IPV6_ROUTE_INFO
1258 if (in6_dev->cnf.accept_ra_rtr_pref && ndopts.nd_opts_ri) {
1259 struct nd_opt_hdr *p;
1260 for (p = ndopts.nd_opts_ri;
1262 p = ndisc_next_option(p, ndopts.nd_opts_ri_end)) {
1263 if (((struct route_info *)p)->prefix_len > in6_dev->cnf.accept_ra_rt_info_max_plen)
1265 rt6_route_rcv(skb->dev, (u8*)p, (p->nd_opt_len) << 3,
1266 &ipv6_hdr(skb)->saddr);
1271 if (in6_dev->cnf.accept_ra_pinfo && ndopts.nd_opts_pi) {
1272 struct nd_opt_hdr *p;
1273 for (p = ndopts.nd_opts_pi;
1275 p = ndisc_next_option(p, ndopts.nd_opts_pi_end)) {
1276 addrconf_prefix_rcv(skb->dev, (u8*)p, (p->nd_opt_len) << 3);
1280 if (ndopts.nd_opts_mtu) {
1284 memcpy(&n, ((u8*)(ndopts.nd_opts_mtu+1))+2, sizeof(mtu));
1287 if (mtu < IPV6_MIN_MTU || mtu > skb->dev->mtu) {
1288 ND_PRINTK2(KERN_WARNING
1289 "ICMPv6 RA: invalid mtu: %d\n",
1291 } else if (in6_dev->cnf.mtu6 != mtu) {
1292 in6_dev->cnf.mtu6 = mtu;
1295 rt->u.dst.metrics[RTAX_MTU-1] = mtu;
1297 rt6_mtu_change(skb->dev, mtu);
1301 if (ndopts.nd_useropts) {
1302 struct nd_opt_hdr *p;
1303 for (p = ndopts.nd_useropts;
1305 p = ndisc_next_useropt(p, ndopts.nd_useropts_end)) {
1306 ndisc_ra_useropt(skb, p);
1310 if (ndopts.nd_opts_tgt_lladdr || ndopts.nd_opts_rh) {
1311 ND_PRINTK2(KERN_WARNING
1312 "ICMPv6 RA: invalid RA options");
1316 dst_release(&rt->u.dst);
1318 neigh_release(neigh);
1319 in6_dev_put(in6_dev);
1322 static void ndisc_redirect_rcv(struct sk_buff *skb)
1324 struct inet6_dev *in6_dev;
1325 struct icmp6hdr *icmph;
1326 struct in6_addr *dest;
1327 struct in6_addr *target; /* new first hop to destination */
1328 struct neighbour *neigh;
1330 struct ndisc_options ndopts;
1334 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) {
1335 ND_PRINTK2(KERN_WARNING
1336 "ICMPv6 Redirect: source address is not link-local.\n");
1340 optlen = skb->tail - skb->transport_header;
1341 optlen -= sizeof(struct icmp6hdr) + 2 * sizeof(struct in6_addr);
1344 ND_PRINTK2(KERN_WARNING
1345 "ICMPv6 Redirect: packet too short\n");
1349 icmph = icmp6_hdr(skb);
1350 target = (struct in6_addr *) (icmph + 1);
1353 if (ipv6_addr_is_multicast(dest)) {
1354 ND_PRINTK2(KERN_WARNING
1355 "ICMPv6 Redirect: destination address is multicast.\n");
1359 if (ipv6_addr_equal(dest, target)) {
1361 } else if (ipv6_addr_type(target) !=
1362 (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
1363 ND_PRINTK2(KERN_WARNING
1364 "ICMPv6 Redirect: target address is not link-local unicast.\n");
1368 in6_dev = in6_dev_get(skb->dev);
1371 if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects) {
1372 in6_dev_put(in6_dev);
1377 * The IP source address of the Redirect MUST be the same as the current
1378 * first-hop router for the specified ICMP Destination Address.
1381 if (!ndisc_parse_options((u8*)(dest + 1), optlen, &ndopts)) {
1382 ND_PRINTK2(KERN_WARNING
1383 "ICMPv6 Redirect: invalid ND options\n");
1384 in6_dev_put(in6_dev);
1387 if (ndopts.nd_opts_tgt_lladdr) {
1388 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr,
1391 ND_PRINTK2(KERN_WARNING
1392 "ICMPv6 Redirect: invalid link-layer address length\n");
1393 in6_dev_put(in6_dev);
1398 neigh = __neigh_lookup(&nd_tbl, target, skb->dev, 1);
1400 rt6_redirect(dest, &ipv6_hdr(skb)->daddr,
1401 &ipv6_hdr(skb)->saddr, neigh, lladdr,
1403 neigh_release(neigh);
1405 in6_dev_put(in6_dev);
1408 void ndisc_send_redirect(struct sk_buff *skb, struct neighbour *neigh,
1409 struct in6_addr *target)
1411 struct net_device *dev = skb->dev;
1412 struct net *net = dev_net(dev);
1413 struct sock *sk = net->ipv6.ndisc_sk;
1414 int len = sizeof(struct icmp6hdr) + 2 * sizeof(struct in6_addr);
1415 struct sk_buff *buff;
1416 struct icmp6hdr *icmph;
1417 struct in6_addr saddr_buf;
1418 struct in6_addr *addrp;
1419 struct rt6_info *rt;
1420 struct dst_entry *dst;
1421 struct inet6_dev *idev;
1426 u8 ha_buf[MAX_ADDR_LEN], *ha = NULL;
1428 if (ipv6_get_lladdr(dev, &saddr_buf, IFA_F_TENTATIVE)) {
1429 ND_PRINTK2(KERN_WARNING
1430 "ICMPv6 Redirect: no link-local address on %s\n",
1435 if (!ipv6_addr_equal(&ipv6_hdr(skb)->daddr, target) &&
1436 ipv6_addr_type(target) != (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
1437 ND_PRINTK2(KERN_WARNING
1438 "ICMPv6 Redirect: target address is not link-local unicast.\n");
1442 icmpv6_flow_init(sk, &fl, NDISC_REDIRECT,
1443 &saddr_buf, &ipv6_hdr(skb)->saddr, dev->ifindex);
1445 dst = ip6_route_output(net, NULL, &fl);
1449 err = xfrm_lookup(&dst, &fl, NULL, 0);
1453 rt = (struct rt6_info *) dst;
1455 if (rt->rt6i_flags & RTF_GATEWAY) {
1456 ND_PRINTK2(KERN_WARNING
1457 "ICMPv6 Redirect: destination is not a neighbour.\n");
1461 if (!xrlim_allow(dst, 1*HZ)) {
1466 if (dev->addr_len) {
1467 read_lock_bh(&neigh->lock);
1468 if (neigh->nud_state & NUD_VALID) {
1469 memcpy(ha_buf, neigh->ha, dev->addr_len);
1470 read_unlock_bh(&neigh->lock);
1472 len += ndisc_opt_addr_space(dev);
1474 read_unlock_bh(&neigh->lock);
1477 rd_len = min_t(unsigned int,
1478 IPV6_MIN_MTU-sizeof(struct ipv6hdr)-len, skb->len + 8);
1482 buff = sock_alloc_send_skb(sk,
1483 (MAX_HEADER + sizeof(struct ipv6hdr) +
1484 len + LL_RESERVED_SPACE(dev)),
1488 "ICMPv6 Redirect: %s() failed to allocate an skb.\n",
1494 skb_reserve(buff, LL_RESERVED_SPACE(dev));
1495 ip6_nd_hdr(sk, buff, dev, &saddr_buf, &ipv6_hdr(skb)->saddr,
1496 IPPROTO_ICMPV6, len);
1498 skb_set_transport_header(buff, skb_tail_pointer(buff) - buff->data);
1500 icmph = icmp6_hdr(buff);
1502 memset(icmph, 0, sizeof(struct icmp6hdr));
1503 icmph->icmp6_type = NDISC_REDIRECT;
1506 * copy target and destination addresses
1509 addrp = (struct in6_addr *)(icmph + 1);
1510 ipv6_addr_copy(addrp, target);
1512 ipv6_addr_copy(addrp, &ipv6_hdr(skb)->daddr);
1514 opt = (u8*) (addrp + 1);
1517 * include target_address option
1521 opt = ndisc_fill_addr_option(opt, ND_OPT_TARGET_LL_ADDR, ha,
1522 dev->addr_len, dev->type);
1525 * build redirect option and copy skb over to the new packet.
1529 *(opt++) = ND_OPT_REDIRECT_HDR;
1530 *(opt++) = (rd_len >> 3);
1533 memcpy(opt, ipv6_hdr(skb), rd_len - 8);
1535 icmph->icmp6_cksum = csum_ipv6_magic(&saddr_buf, &ipv6_hdr(skb)->saddr,
1536 len, IPPROTO_ICMPV6,
1537 csum_partial((u8 *) icmph, len, 0));
1540 idev = in6_dev_get(dst->dev);
1541 IP6_INC_STATS(idev, IPSTATS_MIB_OUTREQUESTS);
1542 err = NF_HOOK(PF_INET6, NF_INET_LOCAL_OUT, buff, NULL, dst->dev,
1545 ICMP6MSGOUT_INC_STATS(idev, NDISC_REDIRECT);
1546 ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS);
1549 if (likely(idev != NULL))
1553 static void pndisc_redo(struct sk_buff *skb)
1559 int ndisc_rcv(struct sk_buff *skb)
1563 if (!pskb_may_pull(skb, skb->len))
1566 msg = (struct nd_msg *)skb_transport_header(skb);
1568 __skb_push(skb, skb->data - skb_transport_header(skb));
1570 if (ipv6_hdr(skb)->hop_limit != 255) {
1571 ND_PRINTK2(KERN_WARNING
1572 "ICMPv6 NDISC: invalid hop-limit: %d\n",
1573 ipv6_hdr(skb)->hop_limit);
1577 if (msg->icmph.icmp6_code != 0) {
1578 ND_PRINTK2(KERN_WARNING
1579 "ICMPv6 NDISC: invalid ICMPv6 code: %d\n",
1580 msg->icmph.icmp6_code);
1584 memset(NEIGH_CB(skb), 0, sizeof(struct neighbour_cb));
1586 switch (msg->icmph.icmp6_type) {
1587 case NDISC_NEIGHBOUR_SOLICITATION:
1591 case NDISC_NEIGHBOUR_ADVERTISEMENT:
1595 case NDISC_ROUTER_SOLICITATION:
1599 case NDISC_ROUTER_ADVERTISEMENT:
1600 ndisc_router_discovery(skb);
1603 case NDISC_REDIRECT:
1604 ndisc_redirect_rcv(skb);
1611 static int ndisc_netdev_event(struct notifier_block *this, unsigned long event, void *ptr)
1613 struct net_device *dev = ptr;
1614 struct net *net = dev_net(dev);
1617 case NETDEV_CHANGEADDR:
1618 neigh_changeaddr(&nd_tbl, dev);
1619 fib6_run_gc(~0UL, net);
1622 neigh_ifdown(&nd_tbl, dev);
1623 fib6_run_gc(~0UL, net);
1632 static struct notifier_block ndisc_netdev_notifier = {
1633 .notifier_call = ndisc_netdev_event,
1636 #ifdef CONFIG_SYSCTL
1637 static void ndisc_warn_deprecated_sysctl(struct ctl_table *ctl,
1638 const char *func, const char *dev_name)
1640 static char warncomm[TASK_COMM_LEN];
1642 if (strcmp(warncomm, current->comm) && warned < 5) {
1643 strcpy(warncomm, current->comm);
1645 "process `%s' is using deprecated sysctl (%s) "
1646 "net.ipv6.neigh.%s.%s; "
1647 "Use net.ipv6.neigh.%s.%s_ms "
1650 dev_name, ctl->procname,
1651 dev_name, ctl->procname);
1656 int ndisc_ifinfo_sysctl_change(struct ctl_table *ctl, int write, struct file * filp, void __user *buffer, size_t *lenp, loff_t *ppos)
1658 struct net_device *dev = ctl->extra1;
1659 struct inet6_dev *idev;
1662 if ((strcmp(ctl->procname, "retrans_time") == 0) ||
1663 (strcmp(ctl->procname, "base_reachable_time") == 0))
1664 ndisc_warn_deprecated_sysctl(ctl, "syscall", dev ? dev->name : "default");
1666 if (strcmp(ctl->procname, "retrans_time") == 0)
1667 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
1669 else if (strcmp(ctl->procname, "base_reachable_time") == 0)
1670 ret = proc_dointvec_jiffies(ctl, write,
1671 filp, buffer, lenp, ppos);
1673 else if ((strcmp(ctl->procname, "retrans_time_ms") == 0) ||
1674 (strcmp(ctl->procname, "base_reachable_time_ms") == 0))
1675 ret = proc_dointvec_ms_jiffies(ctl, write,
1676 filp, buffer, lenp, ppos);
1680 if (write && ret == 0 && dev && (idev = in6_dev_get(dev)) != NULL) {
1681 if (ctl->data == &idev->nd_parms->base_reachable_time)
1682 idev->nd_parms->reachable_time = neigh_rand_reach_time(idev->nd_parms->base_reachable_time);
1683 idev->tstamp = jiffies;
1684 inet6_ifinfo_notify(RTM_NEWLINK, idev);
1690 static int ndisc_ifinfo_sysctl_strategy(ctl_table *ctl, int __user *name,
1691 int nlen, void __user *oldval,
1692 size_t __user *oldlenp,
1693 void __user *newval, size_t newlen)
1695 struct net_device *dev = ctl->extra1;
1696 struct inet6_dev *idev;
1699 if (ctl->ctl_name == NET_NEIGH_RETRANS_TIME ||
1700 ctl->ctl_name == NET_NEIGH_REACHABLE_TIME)
1701 ndisc_warn_deprecated_sysctl(ctl, "procfs", dev ? dev->name : "default");
1703 switch (ctl->ctl_name) {
1704 case NET_NEIGH_REACHABLE_TIME:
1705 ret = sysctl_jiffies(ctl, name, nlen,
1706 oldval, oldlenp, newval, newlen);
1708 case NET_NEIGH_RETRANS_TIME_MS:
1709 case NET_NEIGH_REACHABLE_TIME_MS:
1710 ret = sysctl_ms_jiffies(ctl, name, nlen,
1711 oldval, oldlenp, newval, newlen);
1717 if (newval && newlen && ret > 0 &&
1718 dev && (idev = in6_dev_get(dev)) != NULL) {
1719 if (ctl->ctl_name == NET_NEIGH_REACHABLE_TIME ||
1720 ctl->ctl_name == NET_NEIGH_REACHABLE_TIME_MS)
1721 idev->nd_parms->reachable_time = neigh_rand_reach_time(idev->nd_parms->base_reachable_time);
1722 idev->tstamp = jiffies;
1723 inet6_ifinfo_notify(RTM_NEWLINK, idev);
1732 static int ndisc_net_init(struct net *net)
1734 struct socket *sock;
1735 struct ipv6_pinfo *np;
1739 err = sock_create_kern(PF_INET6, SOCK_RAW, IPPROTO_ICMPV6, &sock);
1742 "ICMPv6 NDISC: Failed to initialize the control socket (err %d).\n",
1747 net->ipv6.ndisc_sk = sk = sock->sk;
1748 sk_change_net(sk, net);
1751 sk->sk_allocation = GFP_ATOMIC;
1752 np->hop_limit = 255;
1753 /* Do not loopback ndisc messages */
1755 sk->sk_prot->unhash(sk);
1760 static void ndisc_net_exit(struct net *net)
1762 sk_release_kernel(net->ipv6.ndisc_sk);
1765 static struct pernet_operations ndisc_net_ops = {
1766 .init = ndisc_net_init,
1767 .exit = ndisc_net_exit,
1770 int __init ndisc_init(void)
1774 err = register_pernet_subsys(&ndisc_net_ops);
1778 * Initialize the neighbour table
1780 neigh_table_init(&nd_tbl);
1782 #ifdef CONFIG_SYSCTL
1783 err = neigh_sysctl_register(NULL, &nd_tbl.parms, NET_IPV6,
1784 NET_IPV6_NEIGH, "ipv6",
1785 &ndisc_ifinfo_sysctl_change,
1786 &ndisc_ifinfo_sysctl_strategy);
1788 goto out_unregister_pernet;
1790 err = register_netdevice_notifier(&ndisc_netdev_notifier);
1792 goto out_unregister_sysctl;
1796 out_unregister_sysctl:
1797 #ifdef CONFIG_SYSCTL
1798 neigh_sysctl_unregister(&nd_tbl.parms);
1799 out_unregister_pernet:
1801 unregister_pernet_subsys(&ndisc_net_ops);
1805 void ndisc_cleanup(void)
1807 unregister_netdevice_notifier(&ndisc_netdev_notifier);
1808 #ifdef CONFIG_SYSCTL
1809 neigh_sysctl_unregister(&nd_tbl.parms);
1811 neigh_table_clear(&nd_tbl);
1812 unregister_pernet_subsys(&ndisc_net_ops);