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bonding: send IPv6 neighbor advertisement on failover
[net-next-2.6.git] / net / ipv6 / ndisc.c
CommitLineData
1da177e4
LT		 1/*
2 * Neighbour Discovery for IPv6
1ab1457c 3 * Linux INET6 implementation
1da177e4
LT		 4 *
5 * Authors:
1ab1457c 6 * Pedro Roque <roque@di.fc.ul.pt>
1da177e4
LT		 7 * Mike Shaver <shaver@ingenia.com>
8 *
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.
13 */
14
15/*
16 * Changes:
17 *
31910575
PY		 18 * Pierre Ynard : export userland ND options
19 * through netlink (RDNSS support)
1da177e4
LT		 20 * Lars Fenneberg : fixed MTU setting on receipt
21 * of an RA.
1da177e4
LT		 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
27 */
28
29/* Set to 3 to get tracing... */
30#define ND_DEBUG 1
31
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
38#if ND_DEBUG >= 1
39#undef ND_PRINTK1
40#define ND_PRINTK1 ND_PRINTK
41#endif
42#if ND_DEBUG >= 2
43#undef ND_PRINTK2
44#define ND_PRINTK2 ND_PRINTK
45#endif
46#if ND_DEBUG >= 3
47#undef ND_PRINTK3
48#define ND_PRINTK3 ND_PRINTK
49#endif
50
51#include <linux/module.h>
1da177e4
LT		 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>
62#ifdef CONFIG_SYSCTL
63#include <linux/sysctl.h>
64#endif
65
1823730f 66#include <linux/if_addr.h>
1da177e4
LT		 67#include <linux/if_arp.h>
68#include <linux/ipv6.h>
69#include <linux/icmpv6.h>
70#include <linux/jhash.h>
71
72#include <net/sock.h>
73#include <net/snmp.h>
74
75#include <net/ipv6.h>
76#include <net/protocol.h>
77#include <net/ndisc.h>
78#include <net/ip6_route.h>
79#include <net/addrconf.h>
80#include <net/icmp.h>
81
31910575
PY		 82#include <net/netlink.h>
83#include <linux/rtnetlink.h>
84
1da177e4
LT		 85#include <net/flow.h>
86#include <net/ip6_checksum.h>
1ed8516f 87#include <net/inet_common.h>
1da177e4
LT		 88#include <linux/proc_fs.h>
89
90#include <linux/netfilter.h>
91#include <linux/netfilter_ipv6.h>
92
1da177e4
LT		 93static u32 ndisc_hash(const void *pkey, const struct net_device *dev);
94static int ndisc_constructor(struct neighbour *neigh);
95static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb);
96static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb);
97static int pndisc_constructor(struct pneigh_entry *n);
98static void pndisc_destructor(struct pneigh_entry *n);
99static void pndisc_redo(struct sk_buff *skb);
100
101static struct neigh_ops ndisc_generic_ops = {
102 .family = AF_INET6,
103 .solicit = ndisc_solicit,
104 .error_report = ndisc_error_report,
105 .output = neigh_resolve_output,
106 .connected_output = neigh_connected_output,
107 .hh_output = dev_queue_xmit,
108 .queue_xmit = dev_queue_xmit,
109};
110
111static struct neigh_ops ndisc_hh_ops = {
112 .family = AF_INET6,
113 .solicit = ndisc_solicit,
114 .error_report = ndisc_error_report,
115 .output = neigh_resolve_output,
116 .connected_output = neigh_resolve_output,
117 .hh_output = dev_queue_xmit,
118 .queue_xmit = dev_queue_xmit,
119};
120
121
122static struct neigh_ops ndisc_direct_ops = {
123 .family = AF_INET6,
124 .output = dev_queue_xmit,
125 .connected_output = dev_queue_xmit,
126 .hh_output = dev_queue_xmit,
127 .queue_xmit = dev_queue_xmit,
128};
129
130struct neigh_table nd_tbl = {
131 .family = AF_INET6,
132 .entry_size = sizeof(struct neighbour) + sizeof(struct in6_addr),
133 .key_len = sizeof(struct in6_addr),
134 .hash = ndisc_hash,
135 .constructor = ndisc_constructor,
136 .pconstructor = pndisc_constructor,
137 .pdestructor = pndisc_destructor,
138 .proxy_redo = pndisc_redo,
139 .id = "ndisc_cache",
140 .parms = {
141 .tbl = &nd_tbl,
142 .base_reachable_time = 30 * HZ,
143 .retrans_time = 1 * HZ,
144 .gc_staletime = 60 * HZ,
145 .reachable_time = 30 * HZ,
146 .delay_probe_time = 5 * HZ,
147 .queue_len = 3,
148 .ucast_probes = 3,
149 .mcast_probes = 3,
150 .anycast_delay = 1 * HZ,
151 .proxy_delay = (8 * HZ) / 10,
152 .proxy_qlen = 64,
153 },
154 .gc_interval = 30 * HZ,
155 .gc_thresh1 = 128,
156 .gc_thresh2 = 512,
157 .gc_thresh3 = 1024,
158};
159
160/* ND options */
161struct ndisc_options {
70ceb4f5
YH		 162 struct nd_opt_hdr *nd_opt_array[__ND_OPT_ARRAY_MAX];
163#ifdef CONFIG_IPV6_ROUTE_INFO
164 struct nd_opt_hdr *nd_opts_ri;
165 struct nd_opt_hdr *nd_opts_ri_end;
166#endif
31910575
PY		 167 struct nd_opt_hdr *nd_useropts;
168 struct nd_opt_hdr *nd_useropts_end;
1da177e4
LT		 169};
170
171#define nd_opts_src_lladdr nd_opt_array[ND_OPT_SOURCE_LL_ADDR]
172#define nd_opts_tgt_lladdr nd_opt_array[ND_OPT_TARGET_LL_ADDR]
173#define nd_opts_pi nd_opt_array[ND_OPT_PREFIX_INFO]
174#define nd_opts_pi_end nd_opt_array[__ND_OPT_PREFIX_INFO_END]
175#define nd_opts_rh nd_opt_array[ND_OPT_REDIRECT_HDR]
176#define nd_opts_mtu nd_opt_array[ND_OPT_MTU]
177
178#define NDISC_OPT_SPACE(len) (((len)+2+7)&~7)
179
180/*
181 * Return the padding between the option length and the start of the
182 * link addr. Currently only IP-over-InfiniBand needs this, although
183 * if RFC 3831 IPv6-over-Fibre Channel is ever implemented it may
184 * also need a pad of 2.
185 */
186static int ndisc_addr_option_pad(unsigned short type)
187{
188 switch (type) {
189 case ARPHRD_INFINIBAND: return 2;
190 default: return 0;
191 }
192}
193
194static inline int ndisc_opt_addr_space(struct net_device *dev)
195{
196 return NDISC_OPT_SPACE(dev->addr_len + ndisc_addr_option_pad(dev->type));
197}
198
199static u8 *ndisc_fill_addr_option(u8 *opt, int type, void *data, int data_len,
200 unsigned short addr_type)
201{
202 int space = NDISC_OPT_SPACE(data_len);
203 int pad = ndisc_addr_option_pad(addr_type);
204
205 opt[0] = type;
206 opt[1] = space>>3;
207
208 memset(opt + 2, 0, pad);
209 opt += pad;
210 space -= pad;
211
212 memcpy(opt+2, data, data_len);
213 data_len += 2;
214 opt += data_len;
215 if ((space -= data_len) > 0)
216 memset(opt, 0, space);
217 return opt + space;
218}
219
220static struct nd_opt_hdr *ndisc_next_option(struct nd_opt_hdr *cur,
221 struct nd_opt_hdr *end)
222{
223 int type;
224 if (!cur || !end || cur >= end)
225 return NULL;
226 type = cur->nd_opt_type;
227 do {
228 cur = ((void *)cur) + (cur->nd_opt_len << 3);
229 } while(cur < end && cur->nd_opt_type != type);
230 return (cur <= end && cur->nd_opt_type == type ? cur : NULL);
231}
232
31910575
PY		 233static inline int ndisc_is_useropt(struct nd_opt_hdr *opt)
234{
235 return (opt->nd_opt_type == ND_OPT_RDNSS);
236}
237
238static struct nd_opt_hdr *ndisc_next_useropt(struct nd_opt_hdr *cur,
239 struct nd_opt_hdr *end)
240{
241 if (!cur || !end || cur >= end)
242 return NULL;
243 do {
244 cur = ((void *)cur) + (cur->nd_opt_len << 3);
245 } while(cur < end && !ndisc_is_useropt(cur));
246 return (cur <= end && ndisc_is_useropt(cur) ? cur : NULL);
247}
248
1da177e4
LT		 249static struct ndisc_options *ndisc_parse_options(u8 *opt, int opt_len,
250 struct ndisc_options *ndopts)
251{
252 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)opt;
253
254 if (!nd_opt || opt_len < 0 || !ndopts)
255 return NULL;
256 memset(ndopts, 0, sizeof(*ndopts));
257 while (opt_len) {
258 int l;
259 if (opt_len < sizeof(struct nd_opt_hdr))
260 return NULL;
261 l = nd_opt->nd_opt_len << 3;
262 if (opt_len < l || l == 0)
263 return NULL;
264 switch (nd_opt->nd_opt_type) {
265 case ND_OPT_SOURCE_LL_ADDR:
266 case ND_OPT_TARGET_LL_ADDR:
267 case ND_OPT_MTU:
268 case ND_OPT_REDIRECT_HDR:
269 if (ndopts->nd_opt_array[nd_opt->nd_opt_type]) {
270 ND_PRINTK2(KERN_WARNING
271 "%s(): duplicated ND6 option found: type=%d\n",
0dc47877 272 __func__,
1da177e4
LT		 273 nd_opt->nd_opt_type);
274 } else {
275 ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt;
276 }
277 break;
278 case ND_OPT_PREFIX_INFO:
279 ndopts->nd_opts_pi_end = nd_opt;
cfcabdcc 280 if (!ndopts->nd_opt_array[nd_opt->nd_opt_type])
1da177e4
LT		 281 ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt;
282 break;
70ceb4f5
YH		 283#ifdef CONFIG_IPV6_ROUTE_INFO
284 case ND_OPT_ROUTE_INFO:
285 ndopts->nd_opts_ri_end = nd_opt;
286 if (!ndopts->nd_opts_ri)
287 ndopts->nd_opts_ri = nd_opt;
288 break;
289#endif
1da177e4 290 default:
31910575
PY		 291 if (ndisc_is_useropt(nd_opt)) {
292 ndopts->nd_useropts_end = nd_opt;
293 if (!ndopts->nd_useropts)
294 ndopts->nd_useropts = nd_opt;
295 } else {
296 /*
297 * Unknown options must be silently ignored,
298 * to accommodate future extension to the
299 * protocol.
300 */
301 ND_PRINTK2(KERN_NOTICE
302 "%s(): ignored unsupported option; type=%d, len=%d\n",
0dc47877 303 __func__,
31910575
PY		 304 nd_opt->nd_opt_type, nd_opt->nd_opt_len);
305 }
1da177e4
LT		 306 }
307 opt_len -= l;
308 nd_opt = ((void *)nd_opt) + l;
309 }
310 return ndopts;
311}
312
313static inline u8 *ndisc_opt_addr_data(struct nd_opt_hdr *p,
314 struct net_device *dev)
315{
316 u8 *lladdr = (u8 *)(p + 1);
317 int lladdrlen = p->nd_opt_len << 3;
318 int prepad = ndisc_addr_option_pad(dev->type);
319 if (lladdrlen != NDISC_OPT_SPACE(dev->addr_len + prepad))
320 return NULL;
321 return (lladdr + prepad);
322}
323
324int ndisc_mc_map(struct in6_addr *addr, char *buf, struct net_device *dev, int dir)
325{
326 switch (dev->type) {
327 case ARPHRD_ETHER:
328 case ARPHRD_IEEE802: /* Not sure. Check it later. --ANK */
329 case ARPHRD_FDDI:
330 ipv6_eth_mc_map(addr, buf);
331 return 0;
332 case ARPHRD_IEEE802_TR:
333 ipv6_tr_mc_map(addr,buf);
334 return 0;
335 case ARPHRD_ARCNET:
336 ipv6_arcnet_mc_map(addr, buf);
337 return 0;
338 case ARPHRD_INFINIBAND:
a9e527e3 339 ipv6_ib_mc_map(addr, dev->broadcast, buf);
1da177e4
LT		 340 return 0;
341 default:
342 if (dir) {
343 memcpy(buf, dev->broadcast, dev->addr_len);
344 return 0;
345 }
346 }
347 return -EINVAL;
348}
349
7159039a
YH		 350EXPORT_SYMBOL(ndisc_mc_map);
351
1da177e4
LT		 352static u32 ndisc_hash(const void *pkey, const struct net_device *dev)
353{
354 const u32 *p32 = pkey;
355 u32 addr_hash, i;
356
357 addr_hash = 0;
358 for (i = 0; i < (sizeof(struct in6_addr) / sizeof(u32)); i++)
359 addr_hash ^= *p32++;
360
361 return jhash_2words(addr_hash, dev->ifindex, nd_tbl.hash_rnd);
362}
363
364static int ndisc_constructor(struct neighbour *neigh)
365{
366 struct in6_addr *addr = (struct in6_addr*)&neigh->primary_key;
367 struct net_device *dev = neigh->dev;
368 struct inet6_dev *in6_dev;
369 struct neigh_parms *parms;
370 int is_multicast = ipv6_addr_is_multicast(addr);
371
372 rcu_read_lock();
373 in6_dev = in6_dev_get(dev);
374 if (in6_dev == NULL) {
375 rcu_read_unlock();
376 return -EINVAL;
377 }
378
379 parms = in6_dev->nd_parms;
380 __neigh_parms_put(neigh->parms);
381 neigh->parms = neigh_parms_clone(parms);
382 rcu_read_unlock();
383
384 neigh->type = is_multicast ? RTN_MULTICAST : RTN_UNICAST;
3b04ddde 385 if (!dev->header_ops) {
1da177e4
LT		 386 neigh->nud_state = NUD_NOARP;
387 neigh->ops = &ndisc_direct_ops;
388 neigh->output = neigh->ops->queue_xmit;
389 } else {
390 if (is_multicast) {
391 neigh->nud_state = NUD_NOARP;
392 ndisc_mc_map(addr, neigh->ha, dev, 1);
393 } else if (dev->flags&(IFF_NOARP|IFF_LOOPBACK)) {
394 neigh->nud_state = NUD_NOARP;
395 memcpy(neigh->ha, dev->dev_addr, dev->addr_len);
396 if (dev->flags&IFF_LOOPBACK)
397 neigh->type = RTN_LOCAL;
398 } else if (dev->flags&IFF_POINTOPOINT) {
399 neigh->nud_state = NUD_NOARP;
400 memcpy(neigh->ha, dev->broadcast, dev->addr_len);
401 }
3b04ddde 402 if (dev->header_ops->cache)
1da177e4
LT		 403 neigh->ops = &ndisc_hh_ops;
404 else
405 neigh->ops = &ndisc_generic_ops;
406 if (neigh->nud_state&NUD_VALID)
407 neigh->output = neigh->ops->connected_output;
408 else
409 neigh->output = neigh->ops->output;
410 }
411 in6_dev_put(in6_dev);
412 return 0;
413}
414
415static int pndisc_constructor(struct pneigh_entry *n)
416{
417 struct in6_addr *addr = (struct in6_addr*)&n->key;
418 struct in6_addr maddr;
419 struct net_device *dev = n->dev;
420
421 if (dev == NULL || __in6_dev_get(dev) == NULL)
422 return -EINVAL;
423 addrconf_addr_solict_mult(addr, &maddr);
424 ipv6_dev_mc_inc(dev, &maddr);
425 return 0;
426}
427
428static void pndisc_destructor(struct pneigh_entry *n)
429{
430 struct in6_addr *addr = (struct in6_addr*)&n->key;
431 struct in6_addr maddr;
432 struct net_device *dev = n->dev;
433
434 if (dev == NULL || __in6_dev_get(dev) == NULL)
435 return;
436 addrconf_addr_solict_mult(addr, &maddr);
437 ipv6_dev_mc_dec(dev, &maddr);
438}
439
305d552a
BH		 440struct sk_buff *ndisc_build_skb(struct net_device *dev,
441 const struct in6_addr *daddr,
442 const struct in6_addr *saddr,
443 struct icmp6hdr *icmp6h,
444 const struct in6_addr *target,
445 int llinfo)
1da177e4 446{
c346dca1 447 struct net *net = dev_net(dev);
1762f7e8 448 struct sock *sk = net->ipv6.ndisc_sk;
1ab1457c 449 struct sk_buff *skb;
e1ec7842 450 struct icmp6hdr *hdr;
e1ec7842 451 int len;
1da177e4 452 int err;
305d552a 453 u8 *opt;
1da177e4 454
e1ec7842
YH		 455 if (!dev->addr_len)
456 llinfo = 0;
457
458 len = sizeof(struct icmp6hdr) + (target ? sizeof(*target) : 0);
459 if (llinfo)
460 len += ndisc_opt_addr_space(dev);
1da177e4 461
d54a81d3
DM		 462 skb = sock_alloc_send_skb(sk,
463 (MAX_HEADER + sizeof(struct ipv6hdr) +
f5184d26 464 len + LL_ALLOCATED_SPACE(dev)),
1da177e4 465 1, &err);
e1ec7842 466 if (!skb) {
1da177e4 467 ND_PRINTK0(KERN_ERR
e1ec7842 468 "ICMPv6 ND: %s() failed to allocate an skb.\n",
0dc47877 469 __func__);
305d552a 470 return NULL;
1da177e4
LT		 471 }
472
473 skb_reserve(skb, LL_RESERVED_SPACE(dev));
e1ec7842 474 ip6_nd_hdr(sk, skb, dev, saddr, daddr, IPPROTO_ICMPV6, len);
1da177e4 475
27a884dc 476 skb->transport_header = skb->tail;
d10ba34b 477 skb_put(skb, len);
1da177e4 478
e1ec7842
YH		 479 hdr = (struct icmp6hdr *)skb_transport_header(skb);
480 memcpy(hdr, icmp6h, sizeof(*hdr));
1da177e4 481
e1ec7842
YH		 482 opt = skb_transport_header(skb) + sizeof(struct icmp6hdr);
483 if (target) {
484 ipv6_addr_copy((struct in6_addr *)opt, target);
485 opt += sizeof(*target);
486 }
1da177e4 487
e1ec7842
YH		 488 if (llinfo)
489 ndisc_fill_addr_option(opt, llinfo, dev->dev_addr,
1da177e4
LT		 490 dev->addr_len, dev->type);
491
e1ec7842
YH		 492 hdr->icmp6_cksum = csum_ipv6_magic(saddr, daddr, len,
493 IPPROTO_ICMPV6,
494 csum_partial((__u8 *) hdr,
495 len, 0));
1da177e4 496
305d552a
BH		 497 return skb;
498}
499
500EXPORT_SYMBOL(ndisc_build_skb);
501
502void ndisc_send_skb(struct sk_buff *skb,
503 struct net_device *dev,
504 struct neighbour *neigh,
505 const struct in6_addr *daddr,
506 const struct in6_addr *saddr,
507 struct icmp6hdr *icmp6h)
508{
509 struct flowi fl;
510 struct dst_entry *dst;
511 struct net *net = dev_net(dev);
512 struct sock *sk = net->ipv6.ndisc_sk;
513 struct inet6_dev *idev;
514 int err;
515 u8 type;
516
517 type = icmp6h->icmp6_type;
518
519 icmpv6_flow_init(sk, &fl, type, saddr, daddr, dev->ifindex);
520
521 dst = icmp6_dst_alloc(dev, neigh, daddr);
522 if (!dst) {
523 kfree_skb(skb);
524 return;
525 }
526
527 err = xfrm_lookup(&dst, &fl, NULL, 0);
528 if (err < 0) {
529 kfree_skb(skb);
530 return;
531 }
532
1da177e4 533 skb->dst = dst;
e1ec7842 534
1da177e4 535 idev = in6_dev_get(dst->dev);
3bd653c8 536 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTREQUESTS);
e1ec7842 537
6e23ae2a
PM		 538 err = NF_HOOK(PF_INET6, NF_INET_LOCAL_OUT, skb, NULL, dst->dev,
539 dst_output);
1da177e4 540 if (!err) {
5c5d244b 541 ICMP6MSGOUT_INC_STATS(net, idev, type);
a862f6a6 542 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1da177e4
LT		 543 }
544
545 if (likely(idev != NULL))
546 in6_dev_put(idev);
1ab1457c 547}
1da177e4 548
305d552a
BH		 549EXPORT_SYMBOL(ndisc_send_skb);
550
551/*
552 * Send a Neighbour Discover packet
553 */
554static void __ndisc_send(struct net_device *dev,
555 struct neighbour *neigh,
556 const struct in6_addr *daddr,
557 const struct in6_addr *saddr,
558 struct icmp6hdr *icmp6h, const struct in6_addr *target,
559 int llinfo)
560{
561 struct sk_buff *skb;
562
563 skb = ndisc_build_skb(dev, daddr, saddr, icmp6h, target, llinfo);
564 if (!skb)
565 return;
566
567 ndisc_send_skb(skb, dev, neigh, daddr, saddr, icmp6h);
568}
569
e1ec7842 570static void ndisc_send_na(struct net_device *dev, struct neighbour *neigh,
9acd9f3a
YH		 571 const struct in6_addr *daddr,
572 const struct in6_addr *solicited_addr,
573 int router, int solicited, int override, int inc_opt)
e1ec7842
YH		 574{
575 struct in6_addr tmpaddr;
576 struct inet6_ifaddr *ifp;
9acd9f3a 577 const struct in6_addr *src_addr;
e1ec7842
YH		 578 struct icmp6hdr icmp6h = {
579 .icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT,
580 };
581
582 /* for anycast or proxy, solicited_addr != src_addr */
c346dca1 583 ifp = ipv6_get_ifaddr(dev_net(dev), solicited_addr, dev, 1);
e1ec7842
YH		 584 if (ifp) {
585 src_addr = solicited_addr;
586 if (ifp->flags & IFA_F_OPTIMISTIC)
587 override = 0;
588 in6_ifa_put(ifp);
589 } else {
191cd582 590 if (ipv6_dev_get_saddr(dev_net(dev), dev, daddr,
c346dca1 591 inet6_sk(dev_net(dev)->ipv6.ndisc_sk)->srcprefs,
7cbca67c 592 &tmpaddr))
e1ec7842
YH		 593 return;
594 src_addr = &tmpaddr;
595 }
596
597 icmp6h.icmp6_router = router;
598 icmp6h.icmp6_solicited = solicited;
599 icmp6h.icmp6_override = override;
600
601 __ndisc_send(dev, neigh, daddr, src_addr,
602 &icmp6h, solicited_addr,
14878f75 603 inc_opt ? ND_OPT_TARGET_LL_ADDR : 0);
e1ec7842
YH		 604}
605
1da177e4 606void ndisc_send_ns(struct net_device *dev, struct neighbour *neigh,
9acd9f3a
YH		 607 const struct in6_addr *solicit,
608 const struct in6_addr *daddr, const struct in6_addr *saddr)
1da177e4 609{
1da177e4 610 struct in6_addr addr_buf;
e1ec7842
YH		 611 struct icmp6hdr icmp6h = {
612 .icmp6_type = NDISC_NEIGHBOUR_SOLICITATION,
613 };
1da177e4
LT		 614
615 if (saddr == NULL) {
95c385b4
NH		 616 if (ipv6_get_lladdr(dev, &addr_buf,
617 (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC)))
1da177e4
LT		 618 return;
619 saddr = &addr_buf;
620 }
621
e1ec7842
YH		 622 __ndisc_send(dev, neigh, daddr, saddr,
623 &icmp6h, solicit,
14878f75 624 !ipv6_addr_any(saddr) ? ND_OPT_SOURCE_LL_ADDR : 0);
1da177e4
LT		 625}
626
9acd9f3a
YH		 627void ndisc_send_rs(struct net_device *dev, const struct in6_addr *saddr,
628 const struct in6_addr *daddr)
1da177e4 629{
e1ec7842
YH		 630 struct icmp6hdr icmp6h = {
631 .icmp6_type = NDISC_ROUTER_SOLICITATION,
632 };
95c385b4 633 int send_sllao = dev->addr_len;
95c385b4
NH		 634
635#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
636 /*
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
bea85195 642 * suppress the inclusion of the sllao.
95c385b4
NH		 643 */
644 if (send_sllao) {
c346dca1 645 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(dev_net(dev), saddr,
1cab3da6 646 dev, 1);
95c385b4
NH		 647 if (ifp) {
648 if (ifp->flags & IFA_F_OPTIMISTIC) {
ca043569 649 send_sllao = 0;
95c385b4 650 }
ca043569 651 in6_ifa_put(ifp);
95c385b4
NH		 652 } else {
653 send_sllao = 0;
654 }
655 }
656#endif
e1ec7842
YH		 657 __ndisc_send(dev, NULL, daddr, saddr,
658 &icmp6h, NULL,
14878f75 659 send_sllao ? ND_OPT_SOURCE_LL_ADDR : 0);
1da177e4 660}
1ab1457c 661
1da177e4
LT		 662
663static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb)
664{
665 /*
666 * "The sender MUST return an ICMP
667 * destination unreachable"
668 */
669 dst_link_failure(skb);
670 kfree_skb(skb);
671}
672
673/* Called with locked neigh: either read or both */
674
675static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb)
676{
677 struct in6_addr *saddr = NULL;
678 struct in6_addr mcaddr;
679 struct net_device *dev = neigh->dev;
680 struct in6_addr *target = (struct in6_addr *)&neigh->primary_key;
681 int probes = atomic_read(&neigh->probes);
682
c346dca1 683 if (skb && ipv6_chk_addr(dev_net(dev), &ipv6_hdr(skb)->saddr, dev, 1))
0660e03f 684 saddr = &ipv6_hdr(skb)->saddr;
1da177e4
LT		 685
686 if ((probes -= neigh->parms->ucast_probes) < 0) {
687 if (!(neigh->nud_state & NUD_VALID)) {
5b095d98 688 ND_PRINTK1(KERN_DEBUG "%s(): trying to ucast probe in NUD_INVALID: %pI6\n",
0c6ce78a 689 __func__, target);
1da177e4
LT		 690 }
691 ndisc_send_ns(dev, neigh, target, target, saddr);
692 } else if ((probes -= neigh->parms->app_probes) < 0) {
693#ifdef CONFIG_ARPD
694 neigh_app_ns(neigh);
695#endif
696 } else {
697 addrconf_addr_solict_mult(target, &mcaddr);
698 ndisc_send_ns(dev, NULL, target, &mcaddr, saddr);
699 }
700}
701
0736ffc0
YH		 702static int pndisc_is_router(const void *pkey,
703 struct net_device *dev)
fa86d322
PE		 704{
705 struct pneigh_entry *n;
0736ffc0 706 int ret = -1;
fa86d322
PE		 707
708 read_lock_bh(&nd_tbl.lock);
0736ffc0
YH		 709 n = __pneigh_lookup(&nd_tbl, dev_net(dev), pkey, dev);
710 if (n)
711 ret = !!(n->flags & NTF_ROUTER);
fa86d322
PE		 712 read_unlock_bh(&nd_tbl.lock);
713
0736ffc0 714 return ret;
fa86d322
PE		 715}
716
1da177e4
LT		 717static void ndisc_recv_ns(struct sk_buff *skb)
718{
9c70220b 719 struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb);
0660e03f
ACM		 720 struct in6_addr *saddr = &ipv6_hdr(skb)->saddr;
721 struct in6_addr *daddr = &ipv6_hdr(skb)->daddr;
1da177e4 722 u8 *lladdr = NULL;
27a884dc
ACM		 723 u32 ndoptlen = skb->tail - (skb->transport_header +
724 offsetof(struct nd_msg, opt));
1da177e4
LT		 725 struct ndisc_options ndopts;
726 struct net_device *dev = skb->dev;
727 struct inet6_ifaddr *ifp;
728 struct inet6_dev *idev = NULL;
729 struct neighbour *neigh;
730 int dad = ipv6_addr_any(saddr);
731 int inc;
0736ffc0 732 int is_router = -1;
1da177e4
LT		 733
734 if (ipv6_addr_is_multicast(&msg->target)) {
1ab1457c 735 ND_PRINTK2(KERN_WARNING
1da177e4
LT		 736 "ICMPv6 NS: multicast target address");
737 return;
738 }
739
740 /*
741 * RFC2461 7.1.1:
742 * DAD has to be destined for solicited node multicast address.
743 */
744 if (dad &&
745 !(daddr->s6_addr32[0] == htonl(0xff020000) &&
746 daddr->s6_addr32[1] == htonl(0x00000000) &&
747 daddr->s6_addr32[2] == htonl(0x00000001) &&
748 daddr->s6_addr [12] == 0xff )) {
749 ND_PRINTK2(KERN_WARNING
750 "ICMPv6 NS: bad DAD packet (wrong destination)\n");
751 return;
752 }
753
754 if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) {
1ab1457c 755 ND_PRINTK2(KERN_WARNING
1da177e4
LT		 756 "ICMPv6 NS: invalid ND options\n");
757 return;
758 }
759
760 if (ndopts.nd_opts_src_lladdr) {
761 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, dev);
762 if (!lladdr) {
763 ND_PRINTK2(KERN_WARNING
764 "ICMPv6 NS: invalid link-layer address length\n");
765 return;
766 }
767
768 /* RFC2461 7.1.1:
1ab1457c
YH		 769 * If the IP source address is the unspecified address,
770 * there MUST NOT be source link-layer address option
1da177e4
LT		 771 * in the message.
772 */
773 if (dad) {
1ab1457c 774 ND_PRINTK2(KERN_WARNING
1da177e4
LT		 775 "ICMPv6 NS: bad DAD packet (link-layer address option)\n");
776 return;
777 }
778 }
779
780 inc = ipv6_addr_is_multicast(daddr);
781
c346dca1 782 ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1);
a18bc695 783 if (ifp) {
95c385b4
NH		 784
785 if (ifp->flags & (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC)) {
786 if (dad) {
787 if (dev->type == ARPHRD_IEEE802_TR) {
98e399f8
ACM		 788 const unsigned char *sadr;
789 sadr = skb_mac_header(skb);
95c385b4
NH		 790 if (((sadr[8] ^ dev->dev_addr[0]) & 0x7f) == 0 &&
791 sadr[9] == dev->dev_addr[1] &&
792 sadr[10] == dev->dev_addr[2] &&
793 sadr[11] == dev->dev_addr[3] &&
794 sadr[12] == dev->dev_addr[4] &&
795 sadr[13] == dev->dev_addr[5]) {
796 /* looped-back to us */
797 goto out;
798 }
799 }
800
801 /*
802 * We are colliding with another node
803 * who is doing DAD
804 * so fail our DAD process
805 */
806 addrconf_dad_failure(ifp);
9e3be4b3 807 return;
95c385b4
NH		 808 } else {
809 /*
810 * This is not a dad solicitation.
811 * If we are an optimistic node,
812 * we should respond.
813 * Otherwise, we should ignore it.
814 */
815 if (!(ifp->flags & IFA_F_OPTIMISTIC))
1da177e4 816 goto out;
1da177e4 817 }
1da177e4
LT		 818 }
819
820 idev = ifp->idev;
821 } else {
53b7997f
YH		 822 struct net *net = dev_net(dev);
823
1da177e4
LT		 824 idev = in6_dev_get(dev);
825 if (!idev) {
826 /* XXX: count this drop? */
827 return;
828 }
829
53b7997f 830 if (ipv6_chk_acast_addr(net, dev, &msg->target) ||
1ab1457c 831 (idev->cnf.forwarding &&
53b7997f 832 (net->ipv6.devconf_all->proxy_ndp || idev->cnf.proxy_ndp) &&
0736ffc0 833 (is_router = pndisc_is_router(&msg->target, dev)) >= 0)) {
a61bbcf2 834 if (!(NEIGH_CB(skb)->flags & LOCALLY_ENQUEUED) &&
1da177e4
LT		 835 skb->pkt_type != PACKET_HOST &&
836 inc != 0 &&
837 idev->nd_parms->proxy_delay != 0) {
838 /*
839 * for anycast or proxy,
1ab1457c
YH		 840 * sender should delay its response
841 * by a random time between 0 and
1da177e4
LT		 842 * MAX_ANYCAST_DELAY_TIME seconds.
843 * (RFC2461) -- yoshfuji
844 */
845 struct sk_buff *n = skb_clone(skb, GFP_ATOMIC);
846 if (n)
847 pneigh_enqueue(&nd_tbl, idev->nd_parms, n);
848 goto out;
849 }
850 } else
851 goto out;
852 }
853
0736ffc0
YH		 854 if (is_router < 0)
855 is_router = !!idev->cnf.forwarding;
62dd9318 856
1da177e4 857 if (dad) {
f3ee4010 858 ndisc_send_na(dev, NULL, &in6addr_linklocal_allnodes, &msg->target,
62dd9318 859 is_router, 0, (ifp != NULL), 1);
1da177e4
LT		 860 goto out;
861 }
862
863 if (inc)
864 NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_mcast);
865 else
866 NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_ucast);
867
1ab1457c 868 /*
1da177e4
LT		 869 * update / create cache entry
870 * for the source address
871 */
872 neigh = __neigh_lookup(&nd_tbl, saddr, dev,
873 !inc || lladdr || !dev->addr_len);
874 if (neigh)
1ab1457c 875 neigh_update(neigh, lladdr, NUD_STALE,
1da177e4
LT		 876 NEIGH_UPDATE_F_WEAK_OVERRIDE|
877 NEIGH_UPDATE_F_OVERRIDE);
3b04ddde 878 if (neigh || !dev->header_ops) {
1da177e4 879 ndisc_send_na(dev, neigh, saddr, &msg->target,
62dd9318 880 is_router,
1da177e4
LT		 881 1, (ifp != NULL && inc), inc);
882 if (neigh)
883 neigh_release(neigh);
884 }
885
886out:
887 if (ifp)
888 in6_ifa_put(ifp);
889 else
890 in6_dev_put(idev);
891
892 return;
893}
894
895static void ndisc_recv_na(struct sk_buff *skb)
896{
9c70220b 897 struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb);
0660e03f
ACM		 898 struct in6_addr *saddr = &ipv6_hdr(skb)->saddr;
899 struct in6_addr *daddr = &ipv6_hdr(skb)->daddr;
1da177e4 900 u8 *lladdr = NULL;
27a884dc
ACM		 901 u32 ndoptlen = skb->tail - (skb->transport_header +
902 offsetof(struct nd_msg, opt));
1da177e4
LT		 903 struct ndisc_options ndopts;
904 struct net_device *dev = skb->dev;
905 struct inet6_ifaddr *ifp;
906 struct neighbour *neigh;
907
908 if (skb->len < sizeof(struct nd_msg)) {
909 ND_PRINTK2(KERN_WARNING
910 "ICMPv6 NA: packet too short\n");
911 return;
912 }
913
914 if (ipv6_addr_is_multicast(&msg->target)) {
915 ND_PRINTK2(KERN_WARNING
916 "ICMPv6 NA: target address is multicast.\n");
917 return;
918 }
919
920 if (ipv6_addr_is_multicast(daddr) &&
921 msg->icmph.icmp6_solicited) {
922 ND_PRINTK2(KERN_WARNING
923 "ICMPv6 NA: solicited NA is multicasted.\n");
924 return;
925 }
1ab1457c 926
1da177e4
LT		 927 if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) {
928 ND_PRINTK2(KERN_WARNING
929 "ICMPv6 NS: invalid ND option\n");
930 return;
931 }
932 if (ndopts.nd_opts_tgt_lladdr) {
933 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, dev);
934 if (!lladdr) {
935 ND_PRINTK2(KERN_WARNING
936 "ICMPv6 NA: invalid link-layer address length\n");
937 return;
938 }
939 }
c346dca1 940 ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1);
a18bc695 941 if (ifp) {
1da177e4
LT		 942 if (ifp->flags & IFA_F_TENTATIVE) {
943 addrconf_dad_failure(ifp);
944 return;
945 }
946 /* What should we make now? The advertisement
947 is invalid, but ndisc specs say nothing
948 about it. It could be misconfiguration, or
949 an smart proxy agent tries to help us :-)
950 */
951 ND_PRINTK1(KERN_WARNING
952 "ICMPv6 NA: someone advertises our address on %s!\n",
953 ifp->idev->dev->name);
954 in6_ifa_put(ifp);
955 return;
956 }
957 neigh = neigh_lookup(&nd_tbl, &msg->target, dev);
958
959 if (neigh) {
960 u8 old_flags = neigh->flags;
53b7997f 961 struct net *net = dev_net(dev);
1da177e4
LT		 962
963 if (neigh->nud_state & NUD_FAILED)
964 goto out;
965
5f3e6e9e
VN		 966 /*
967 * Don't update the neighbor cache entry on a proxy NA from
968 * ourselves because either the proxied node is off link or it
969 * has already sent a NA to us.
970 */
971 if (lladdr && !memcmp(lladdr, dev->dev_addr, dev->addr_len) &&
53b7997f
YH		 972 net->ipv6.devconf_all->forwarding && net->ipv6.devconf_all->proxy_ndp &&
973 pneigh_lookup(&nd_tbl, net, &msg->target, dev, 0)) {
fbea49e1 974 /* XXX: idev->cnf.prixy_ndp */
5f3e6e9e 975 goto out;
fbea49e1 976 }
5f3e6e9e 977
1da177e4
LT		 978 neigh_update(neigh, lladdr,
979 msg->icmph.icmp6_solicited ? NUD_REACHABLE : NUD_STALE,
980 NEIGH_UPDATE_F_WEAK_OVERRIDE|
981 (msg->icmph.icmp6_override ? NEIGH_UPDATE_F_OVERRIDE : 0)|
982 NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
983 (msg->icmph.icmp6_router ? NEIGH_UPDATE_F_ISROUTER : 0));
984
985 if ((old_flags & ~neigh->flags) & NTF_ROUTER) {
986 /*
987 * Change: router to host
988 */
989 struct rt6_info *rt;
990 rt = rt6_get_dflt_router(saddr, dev);
991 if (rt)
e0a1ad73 992 ip6_del_rt(rt);
1da177e4
LT		 993 }
994
995out:
996 neigh_release(neigh);
997 }
998}
999
1000static void ndisc_recv_rs(struct sk_buff *skb)
1001{
9c70220b 1002 struct rs_msg *rs_msg = (struct rs_msg *)skb_transport_header(skb);
1da177e4
LT		 1003 unsigned long ndoptlen = skb->len - sizeof(*rs_msg);
1004 struct neighbour *neigh;
1005 struct inet6_dev *idev;
0660e03f 1006 struct in6_addr *saddr = &ipv6_hdr(skb)->saddr;
1da177e4
LT		 1007 struct ndisc_options ndopts;
1008 u8 *lladdr = NULL;
1009
1010 if (skb->len < sizeof(*rs_msg))
1011 return;
1012
1013 idev = in6_dev_get(skb->dev);
1014 if (!idev) {
1015 if (net_ratelimit())
1016 ND_PRINTK1("ICMP6 RS: can't find in6 device\n");
1017 return;
1018 }
1019
1020 /* Don't accept RS if we're not in router mode */
1021 if (!idev->cnf.forwarding)
1022 goto out;
1023
1024 /*
1025 * Don't update NCE if src = ::;
1026 * this implies that the source node has no ip address assigned yet.
1027 */
1028 if (ipv6_addr_any(saddr))
1029 goto out;
1030
1031 /* Parse ND options */
1032 if (!ndisc_parse_options(rs_msg->opt, ndoptlen, &ndopts)) {
1033 if (net_ratelimit())
1034 ND_PRINTK2("ICMP6 NS: invalid ND option, ignored\n");
1035 goto out;
1036 }
1037
1038 if (ndopts.nd_opts_src_lladdr) {
1039 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr,
1040 skb->dev);
1041 if (!lladdr)
1042 goto out;
1043 }
1044
1045 neigh = __neigh_lookup(&nd_tbl, saddr, skb->dev, 1);
1046 if (neigh) {
1047 neigh_update(neigh, lladdr, NUD_STALE,
1048 NEIGH_UPDATE_F_WEAK_OVERRIDE|
1049 NEIGH_UPDATE_F_OVERRIDE|
1050 NEIGH_UPDATE_F_OVERRIDE_ISROUTER);
1051 neigh_release(neigh);
1052 }
1053out:
1054 in6_dev_put(idev);
1055}
1056
31910575
PY		 1057static void ndisc_ra_useropt(struct sk_buff *ra, struct nd_opt_hdr *opt)
1058{
1059 struct icmp6hdr *icmp6h = (struct icmp6hdr *)skb_transport_header(ra);
1060 struct sk_buff *skb;
1061 struct nlmsghdr *nlh;
1062 struct nduseroptmsg *ndmsg;
c346dca1 1063 struct net *net = dev_net(ra->dev);
31910575
PY		 1064 int err;
1065 int base_size = NLMSG_ALIGN(sizeof(struct nduseroptmsg)
1066 + (opt->nd_opt_len << 3));
1067 size_t msg_size = base_size + nla_total_size(sizeof(struct in6_addr));
1068
1069 skb = nlmsg_new(msg_size, GFP_ATOMIC);
1070 if (skb == NULL) {
1071 err = -ENOBUFS;
1072 goto errout;
1073 }
1074
1075 nlh = nlmsg_put(skb, 0, 0, RTM_NEWNDUSEROPT, base_size, 0);
1076 if (nlh == NULL) {
1077 goto nla_put_failure;
1078 }
1079
1080 ndmsg = nlmsg_data(nlh);
1081 ndmsg->nduseropt_family = AF_INET6;
dbb2ed24 1082 ndmsg->nduseropt_ifindex = ra->dev->ifindex;
31910575
PY		 1083 ndmsg->nduseropt_icmp_type = icmp6h->icmp6_type;
1084 ndmsg->nduseropt_icmp_code = icmp6h->icmp6_code;
1085 ndmsg->nduseropt_opts_len = opt->nd_opt_len << 3;
1086
1087 memcpy(ndmsg + 1, opt, opt->nd_opt_len << 3);
1088
1089 NLA_PUT(skb, NDUSEROPT_SRCADDR, sizeof(struct in6_addr),
1090 &ipv6_hdr(ra)->saddr);
1091 nlmsg_end(skb, nlh);
1092
a18bc695 1093 err = rtnl_notify(skb, net, 0, RTNLGRP_ND_USEROPT, NULL,
97c53cac 1094 GFP_ATOMIC);
31910575
PY		 1095 if (err < 0)
1096 goto errout;
1097
1098 return;
1099
1100nla_put_failure:
1101 nlmsg_free(skb);
1102 err = -EMSGSIZE;
1103errout:
a18bc695 1104 rtnl_set_sk_err(net, RTNLGRP_ND_USEROPT, err);
31910575
PY		 1105}
1106
1da177e4
LT		 1107static void ndisc_router_discovery(struct sk_buff *skb)
1108{
9c70220b 1109 struct ra_msg *ra_msg = (struct ra_msg *)skb_transport_header(skb);
1da177e4
LT		 1110 struct neighbour *neigh = NULL;
1111 struct inet6_dev *in6_dev;
65f5c7c1 1112 struct rt6_info *rt = NULL;
1da177e4
LT		 1113 int lifetime;
1114 struct ndisc_options ndopts;
1115 int optlen;
ebacaaa0 1116 unsigned int pref = 0;
1da177e4
LT		 1117
1118 __u8 * opt = (__u8 *)(ra_msg + 1);
1119
27a884dc 1120 optlen = (skb->tail - skb->transport_header) - sizeof(struct ra_msg);
1da177e4 1121
0660e03f 1122 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) {
1da177e4
LT		 1123 ND_PRINTK2(KERN_WARNING
1124 "ICMPv6 RA: source address is not link-local.\n");
1125 return;
1126 }
1127 if (optlen < 0) {
1ab1457c 1128 ND_PRINTK2(KERN_WARNING
1da177e4
LT		 1129 "ICMPv6 RA: packet too short\n");
1130 return;
1131 }
1132
de357cc0 1133#ifdef CONFIG_IPV6_NDISC_NODETYPE
fadf6bf0
TF		 1134 if (skb->ndisc_nodetype == NDISC_NODETYPE_HOST) {
1135 ND_PRINTK2(KERN_WARNING
1136 "ICMPv6 RA: from host or unauthorized router\n");
1137 return;
1138 }
de357cc0 1139#endif
fadf6bf0 1140
1da177e4
LT		 1141 /*
1142 * set the RA_RECV flag in the interface
1143 */
1144
1145 in6_dev = in6_dev_get(skb->dev);
1146 if (in6_dev == NULL) {
1147 ND_PRINTK0(KERN_ERR
1148 "ICMPv6 RA: can't find inet6 device for %s.\n",
1149 skb->dev->name);
1150 return;
1151 }
1152 if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_ra) {
1153 in6_dev_put(in6_dev);
1154 return;
1155 }
1156
1157 if (!ndisc_parse_options(opt, optlen, &ndopts)) {
1158 in6_dev_put(in6_dev);
1159 ND_PRINTK2(KERN_WARNING
1160 "ICMP6 RA: invalid ND options\n");
1161 return;
1162 }
1163
de357cc0 1164#ifdef CONFIG_IPV6_NDISC_NODETYPE
fadf6bf0
TF		 1165 /* skip link-specific parameters from interior routers */
1166 if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT)
1167 goto skip_linkparms;
de357cc0 1168#endif
fadf6bf0 1169
1da177e4
LT		 1170 if (in6_dev->if_flags & IF_RS_SENT) {
1171 /*
1172 * flag that an RA was received after an RS was sent
1173 * out on this interface.
1174 */
1175 in6_dev->if_flags |= IF_RA_RCVD;
1176 }
1177
1178 /*
1179 * Remember the managed/otherconf flags from most recently
1180 * received RA message (RFC 2462) -- yoshfuji
1181 */
1182 in6_dev->if_flags = (in6_dev->if_flags & ~(IF_RA_MANAGED |
1183 IF_RA_OTHERCONF)) |
1184 (ra_msg->icmph.icmp6_addrconf_managed ?
1185 IF_RA_MANAGED : 0) |
1186 (ra_msg->icmph.icmp6_addrconf_other ?
1187 IF_RA_OTHERCONF : 0);
1188
65f5c7c1
YH		 1189 if (!in6_dev->cnf.accept_ra_defrtr)
1190 goto skip_defrtr;
1191
1da177e4
LT		 1192 lifetime = ntohs(ra_msg->icmph.icmp6_rt_lifetime);
1193
ebacaaa0
YH		 1194#ifdef CONFIG_IPV6_ROUTER_PREF
1195 pref = ra_msg->icmph.icmp6_router_pref;
1196 /* 10b is handled as if it were 00b (medium) */
930d6ff2 1197 if (pref == ICMPV6_ROUTER_PREF_INVALID ||
6d5b78cd 1198 !in6_dev->cnf.accept_ra_rtr_pref)
ebacaaa0
YH		 1199 pref = ICMPV6_ROUTER_PREF_MEDIUM;
1200#endif
1201
0660e03f 1202 rt = rt6_get_dflt_router(&ipv6_hdr(skb)->saddr, skb->dev);
1da177e4
LT		 1203
1204 if (rt)
1205 neigh = rt->rt6i_nexthop;
1206
1207 if (rt && lifetime == 0) {
1208 neigh_clone(neigh);
e0a1ad73 1209 ip6_del_rt(rt);
1da177e4
LT		 1210 rt = NULL;
1211 }
1212
1213 if (rt == NULL && lifetime) {
1214 ND_PRINTK3(KERN_DEBUG
1215 "ICMPv6 RA: adding default router.\n");
1216
0660e03f 1217 rt = rt6_add_dflt_router(&ipv6_hdr(skb)->saddr, skb->dev, pref);
1da177e4
LT		 1218 if (rt == NULL) {
1219 ND_PRINTK0(KERN_ERR
1220 "ICMPv6 RA: %s() failed to add default route.\n",
0dc47877 1221 __func__);
1da177e4
LT		 1222 in6_dev_put(in6_dev);
1223 return;
1224 }
1225
1226 neigh = rt->rt6i_nexthop;
1227 if (neigh == NULL) {
1228 ND_PRINTK0(KERN_ERR
1229 "ICMPv6 RA: %s() got default router without neighbour.\n",
0dc47877 1230 __func__);
1da177e4
LT		 1231 dst_release(&rt->u.dst);
1232 in6_dev_put(in6_dev);
1233 return;
1234 }
1235 neigh->flags |= NTF_ROUTER;
ebacaaa0 1236 } else if (rt) {
22441cfa 1237 rt->rt6i_flags = (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
1da177e4
LT		 1238 }
1239
1240 if (rt)
1241 rt->rt6i_expires = jiffies + (HZ * lifetime);
1242
1243 if (ra_msg->icmph.icmp6_hop_limit) {
1244 in6_dev->cnf.hop_limit = ra_msg->icmph.icmp6_hop_limit;
1245 if (rt)
1246 rt->u.dst.metrics[RTAX_HOPLIMIT-1] = ra_msg->icmph.icmp6_hop_limit;
1247 }
1248
65f5c7c1
YH		 1249skip_defrtr:
1250
1da177e4
LT		 1251 /*
1252 * Update Reachable Time and Retrans Timer
1253 */
1254
1255 if (in6_dev->nd_parms) {
1256 unsigned long rtime = ntohl(ra_msg->retrans_timer);
1257
1258 if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/HZ) {
1259 rtime = (rtime*HZ)/1000;
1260 if (rtime < HZ/10)
1261 rtime = HZ/10;
1262 in6_dev->nd_parms->retrans_time = rtime;
1263 in6_dev->tstamp = jiffies;
1264 inet6_ifinfo_notify(RTM_NEWLINK, in6_dev);
1265 }
1266
1267 rtime = ntohl(ra_msg->reachable_time);
1268 if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/(3*HZ)) {
1269 rtime = (rtime*HZ)/1000;
1270
1271 if (rtime < HZ/10)
1272 rtime = HZ/10;
1273
1274 if (rtime != in6_dev->nd_parms->base_reachable_time) {
1275 in6_dev->nd_parms->base_reachable_time = rtime;
1276 in6_dev->nd_parms->gc_staletime = 3 * rtime;
1277 in6_dev->nd_parms->reachable_time = neigh_rand_reach_time(rtime);
1278 in6_dev->tstamp = jiffies;
1279 inet6_ifinfo_notify(RTM_NEWLINK, in6_dev);
1280 }
1281 }
1282 }
1283
de357cc0 1284#ifdef CONFIG_IPV6_NDISC_NODETYPE
fadf6bf0 1285skip_linkparms:
de357cc0 1286#endif
fadf6bf0 1287
1da177e4
LT		 1288 /*
1289 * Process options.
1290 */
1291
1292 if (!neigh)
0660e03f 1293 neigh = __neigh_lookup(&nd_tbl, &ipv6_hdr(skb)->saddr,
1da177e4
LT		 1294 skb->dev, 1);
1295 if (neigh) {
1296 u8 *lladdr = NULL;
1297 if (ndopts.nd_opts_src_lladdr) {
1298 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr,
1299 skb->dev);
1300 if (!lladdr) {
1301 ND_PRINTK2(KERN_WARNING
1302 "ICMPv6 RA: invalid link-layer address length\n");
1303 goto out;
1304 }
1305 }
1306 neigh_update(neigh, lladdr, NUD_STALE,
1307 NEIGH_UPDATE_F_WEAK_OVERRIDE|
1308 NEIGH_UPDATE_F_OVERRIDE|
1309 NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
1310 NEIGH_UPDATE_F_ISROUTER);
1311 }
1312
70ceb4f5 1313#ifdef CONFIG_IPV6_ROUTE_INFO
09c884d4 1314 if (in6_dev->cnf.accept_ra_rtr_pref && ndopts.nd_opts_ri) {
70ceb4f5
YH		 1315 struct nd_opt_hdr *p;
1316 for (p = ndopts.nd_opts_ri;
1317 p;
1318 p = ndisc_next_option(p, ndopts.nd_opts_ri_end)) {
6294e000
YH		 1319 struct route_info *ri = (struct route_info *)p;
1320#ifdef CONFIG_IPV6_NDISC_NODETYPE
1321 if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT &&
1322 ri->prefix_len == 0)
1323 continue;
1324#endif
1325 if (ri->prefix_len > in6_dev->cnf.accept_ra_rt_info_max_plen)
09c884d4 1326 continue;
70ceb4f5 1327 rt6_route_rcv(skb->dev, (u8*)p, (p->nd_opt_len) << 3,
0660e03f 1328 &ipv6_hdr(skb)->saddr);
70ceb4f5
YH		 1329 }
1330 }
1331#endif
1332
de357cc0 1333#ifdef CONFIG_IPV6_NDISC_NODETYPE
fadf6bf0
TF		 1334 /* skip link-specific ndopts from interior routers */
1335 if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT)
1336 goto out;
de357cc0 1337#endif
fadf6bf0 1338
c4fd30eb 1339 if (in6_dev->cnf.accept_ra_pinfo && ndopts.nd_opts_pi) {
1da177e4
LT		 1340 struct nd_opt_hdr *p;
1341 for (p = ndopts.nd_opts_pi;
1342 p;
1343 p = ndisc_next_option(p, ndopts.nd_opts_pi_end)) {
1344 addrconf_prefix_rcv(skb->dev, (u8*)p, (p->nd_opt_len) << 3);
1345 }
1346 }
1347
1348 if (ndopts.nd_opts_mtu) {
e69a4adc 1349 __be32 n;
1da177e4
LT		 1350 u32 mtu;
1351
e69a4adc
AV		 1352 memcpy(&n, ((u8*)(ndopts.nd_opts_mtu+1))+2, sizeof(mtu));
1353 mtu = ntohl(n);
1da177e4
LT		 1354
1355 if (mtu < IPV6_MIN_MTU || mtu > skb->dev->mtu) {
1356 ND_PRINTK2(KERN_WARNING
1357 "ICMPv6 RA: invalid mtu: %d\n",
1358 mtu);
1359 } else if (in6_dev->cnf.mtu6 != mtu) {
1360 in6_dev->cnf.mtu6 = mtu;
1361
1362 if (rt)
1363 rt->u.dst.metrics[RTAX_MTU-1] = mtu;
1364
1365 rt6_mtu_change(skb->dev, mtu);
1366 }
1367 }
1ab1457c 1368
31910575 1369 if (ndopts.nd_useropts) {
61cf46ad
YH		 1370 struct nd_opt_hdr *p;
1371 for (p = ndopts.nd_useropts;
1372 p;
1373 p = ndisc_next_useropt(p, ndopts.nd_useropts_end)) {
1374 ndisc_ra_useropt(skb, p);
31910575
PY		 1375 }
1376 }
1377
1da177e4
LT		 1378 if (ndopts.nd_opts_tgt_lladdr || ndopts.nd_opts_rh) {
1379 ND_PRINTK2(KERN_WARNING
1380 "ICMPv6 RA: invalid RA options");
1381 }
1382out:
1383 if (rt)
1384 dst_release(&rt->u.dst);
1385 else if (neigh)
1386 neigh_release(neigh);
1387 in6_dev_put(in6_dev);
1388}
1389
1390static void ndisc_redirect_rcv(struct sk_buff *skb)
1391{
1392 struct inet6_dev *in6_dev;
1393 struct icmp6hdr *icmph;
1394 struct in6_addr *dest;
1395 struct in6_addr *target; /* new first hop to destination */
1396 struct neighbour *neigh;
1397 int on_link = 0;
1398 struct ndisc_options ndopts;
1399 int optlen;
1400 u8 *lladdr = NULL;
1401
de357cc0 1402#ifdef CONFIG_IPV6_NDISC_NODETYPE
fadf6bf0
TF		 1403 switch (skb->ndisc_nodetype) {
1404 case NDISC_NODETYPE_HOST:
1405 case NDISC_NODETYPE_NODEFAULT:
1406 ND_PRINTK2(KERN_WARNING
1407 "ICMPv6 Redirect: from host or unauthorized router\n");
1408 return;
1409 }
de357cc0 1410#endif
fadf6bf0 1411
0660e03f 1412 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) {
1da177e4
LT		 1413 ND_PRINTK2(KERN_WARNING
1414 "ICMPv6 Redirect: source address is not link-local.\n");
1415 return;
1416 }
1417
27a884dc 1418 optlen = skb->tail - skb->transport_header;
1da177e4
LT		 1419 optlen -= sizeof(struct icmp6hdr) + 2 * sizeof(struct in6_addr);
1420
1421 if (optlen < 0) {
1422 ND_PRINTK2(KERN_WARNING
1423 "ICMPv6 Redirect: packet too short\n");
1424 return;
1425 }
1426
cc70ab26 1427 icmph = icmp6_hdr(skb);
1da177e4
LT		 1428 target = (struct in6_addr *) (icmph + 1);
1429 dest = target + 1;
1430
1431 if (ipv6_addr_is_multicast(dest)) {
1432 ND_PRINTK2(KERN_WARNING
1433 "ICMPv6 Redirect: destination address is multicast.\n");
1434 return;
1435 }
1436
1437 if (ipv6_addr_equal(dest, target)) {
1438 on_link = 1;
bf0b48df
BH		 1439 } else if (ipv6_addr_type(target) !=
1440 (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
1ab1457c 1441 ND_PRINTK2(KERN_WARNING
bf0b48df 1442 "ICMPv6 Redirect: target address is not link-local unicast.\n");
1da177e4
LT		 1443 return;
1444 }
1445
1446 in6_dev = in6_dev_get(skb->dev);
1447 if (!in6_dev)
1448 return;
1449 if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects) {
1450 in6_dev_put(in6_dev);
1451 return;
1452 }
1453
1ab1457c 1454 /* RFC2461 8.1:
1da177e4
LT		 1455 * The IP source address of the Redirect MUST be the same as the current
1456 * first-hop router for the specified ICMP Destination Address.
1457 */
1ab1457c 1458
1da177e4
LT		 1459 if (!ndisc_parse_options((u8*)(dest + 1), optlen, &ndopts)) {
1460 ND_PRINTK2(KERN_WARNING
1461 "ICMPv6 Redirect: invalid ND options\n");
1462 in6_dev_put(in6_dev);
1463 return;
1464 }
1465 if (ndopts.nd_opts_tgt_lladdr) {
1466 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr,
1467 skb->dev);
1468 if (!lladdr) {
1469 ND_PRINTK2(KERN_WARNING
1470 "ICMPv6 Redirect: invalid link-layer address length\n");
1471 in6_dev_put(in6_dev);
1472 return;
1473 }
1474 }
1475
1476 neigh = __neigh_lookup(&nd_tbl, target, skb->dev, 1);
1477 if (neigh) {
0660e03f
ACM		 1478 rt6_redirect(dest, &ipv6_hdr(skb)->daddr,
1479 &ipv6_hdr(skb)->saddr, neigh, lladdr,
1da177e4
LT		 1480 on_link);
1481 neigh_release(neigh);
1482 }
1483 in6_dev_put(in6_dev);
1484}
1485
1486void ndisc_send_redirect(struct sk_buff *skb, struct neighbour *neigh,
9acd9f3a 1487 const struct in6_addr *target)
1da177e4 1488{
1762f7e8 1489 struct net_device *dev = skb->dev;
c346dca1 1490 struct net *net = dev_net(dev);
1762f7e8 1491 struct sock *sk = net->ipv6.ndisc_sk;
1da177e4
LT		 1492 int len = sizeof(struct icmp6hdr) + 2 * sizeof(struct in6_addr);
1493 struct sk_buff *buff;
1494 struct icmp6hdr *icmph;
1495 struct in6_addr saddr_buf;
1496 struct in6_addr *addrp;
1da177e4
LT		 1497 struct rt6_info *rt;
1498 struct dst_entry *dst;
1499 struct inet6_dev *idev;
1500 struct flowi fl;
1501 u8 *opt;
1502 int rd_len;
1503 int err;
1da177e4
LT		 1504 u8 ha_buf[MAX_ADDR_LEN], *ha = NULL;
1505
95c385b4 1506 if (ipv6_get_lladdr(dev, &saddr_buf, IFA_F_TENTATIVE)) {
1da177e4
LT		 1507 ND_PRINTK2(KERN_WARNING
1508 "ICMPv6 Redirect: no link-local address on %s\n",
1509 dev->name);
1ab1457c
YH		 1510 return;
1511 }
1da177e4 1512
0660e03f 1513 if (!ipv6_addr_equal(&ipv6_hdr(skb)->daddr, target) &&
bf0b48df 1514 ipv6_addr_type(target) != (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
29556526 1515 ND_PRINTK2(KERN_WARNING
bf0b48df 1516 "ICMPv6 Redirect: target address is not link-local unicast.\n");
29556526
LY		 1517 return;
1518 }
1519
1762f7e8 1520 icmpv6_flow_init(sk, &fl, NDISC_REDIRECT,
95e41e93 1521 &saddr_buf, &ipv6_hdr(skb)->saddr, dev->ifindex);
1da177e4 1522
1762f7e8 1523 dst = ip6_route_output(net, NULL, &fl);
1da177e4
LT		 1524 if (dst == NULL)
1525 return;
1526
1527 err = xfrm_lookup(&dst, &fl, NULL, 0);
e104411b 1528 if (err)
1da177e4 1529 return;
1da177e4
LT		 1530
1531 rt = (struct rt6_info *) dst;
1532
1533 if (rt->rt6i_flags & RTF_GATEWAY) {
1534 ND_PRINTK2(KERN_WARNING
1535 "ICMPv6 Redirect: destination is not a neighbour.\n");
1536 dst_release(dst);
1537 return;
1538 }
1539 if (!xrlim_allow(dst, 1*HZ)) {
1540 dst_release(dst);
1541 return;
1542 }
1543
1544 if (dev->addr_len) {
1545 read_lock_bh(&neigh->lock);
1546 if (neigh->nud_state & NUD_VALID) {
1547 memcpy(ha_buf, neigh->ha, dev->addr_len);
1548 read_unlock_bh(&neigh->lock);
1549 ha = ha_buf;
1550 len += ndisc_opt_addr_space(dev);
1551 } else
1552 read_unlock_bh(&neigh->lock);
1553 }
1554
1555 rd_len = min_t(unsigned int,
1556 IPV6_MIN_MTU-sizeof(struct ipv6hdr)-len, skb->len + 8);
1557 rd_len &= ~0x7;
1558 len += rd_len;
1559
d54a81d3
DM		 1560 buff = sock_alloc_send_skb(sk,
1561 (MAX_HEADER + sizeof(struct ipv6hdr) +
f5184d26 1562 len + LL_ALLOCATED_SPACE(dev)),
1da177e4
LT		 1563 1, &err);
1564 if (buff == NULL) {
1565 ND_PRINTK0(KERN_ERR
1566 "ICMPv6 Redirect: %s() failed to allocate an skb.\n",
0dc47877 1567 __func__);
1da177e4
LT		 1568 dst_release(dst);
1569 return;
1570 }
1571
1da177e4 1572 skb_reserve(buff, LL_RESERVED_SPACE(dev));
0660e03f 1573 ip6_nd_hdr(sk, buff, dev, &saddr_buf, &ipv6_hdr(skb)->saddr,
1da177e4
LT		 1574 IPPROTO_ICMPV6, len);
1575
27a884dc 1576 skb_set_transport_header(buff, skb_tail_pointer(buff) - buff->data);
d10ba34b
ACM		 1577 skb_put(buff, len);
1578 icmph = icmp6_hdr(buff);
1da177e4
LT		 1579
1580 memset(icmph, 0, sizeof(struct icmp6hdr));
1581 icmph->icmp6_type = NDISC_REDIRECT;
1582
1583 /*
1584 * copy target and destination addresses
1585 */
1586
1587 addrp = (struct in6_addr *)(icmph + 1);
1588 ipv6_addr_copy(addrp, target);
1589 addrp++;
0660e03f 1590 ipv6_addr_copy(addrp, &ipv6_hdr(skb)->daddr);
1da177e4
LT		 1591
1592 opt = (u8*) (addrp + 1);
1593
1594 /*
1595 * include target_address option
1596 */
1597
1598 if (ha)
1599 opt = ndisc_fill_addr_option(opt, ND_OPT_TARGET_LL_ADDR, ha,
1600 dev->addr_len, dev->type);
1601
1602 /*
1603 * build redirect option and copy skb over to the new packet.
1604 */
1605
1ab1457c 1606 memset(opt, 0, 8);
1da177e4
LT		 1607 *(opt++) = ND_OPT_REDIRECT_HDR;
1608 *(opt++) = (rd_len >> 3);
1609 opt += 6;
1610
0660e03f 1611 memcpy(opt, ipv6_hdr(skb), rd_len - 8);
1da177e4 1612
0660e03f 1613 icmph->icmp6_cksum = csum_ipv6_magic(&saddr_buf, &ipv6_hdr(skb)->saddr,
1da177e4
LT		 1614 len, IPPROTO_ICMPV6,
1615 csum_partial((u8 *) icmph, len, 0));
1616
1617 buff->dst = dst;
1618 idev = in6_dev_get(dst->dev);
3bd653c8 1619 IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTREQUESTS);
6e23ae2a
PM		 1620 err = NF_HOOK(PF_INET6, NF_INET_LOCAL_OUT, buff, NULL, dst->dev,
1621 dst_output);
1da177e4 1622 if (!err) {
5c5d244b 1623 ICMP6MSGOUT_INC_STATS(net, idev, NDISC_REDIRECT);
a862f6a6 1624 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1da177e4
LT		 1625 }
1626
1627 if (likely(idev != NULL))
1628 in6_dev_put(idev);
1629}
1630
1631static void pndisc_redo(struct sk_buff *skb)
1632{
140e26fc 1633 ndisc_recv_ns(skb);
1da177e4
LT		 1634 kfree_skb(skb);
1635}
1636
1637int ndisc_rcv(struct sk_buff *skb)
1638{
1639 struct nd_msg *msg;
1640
1641 if (!pskb_may_pull(skb, skb->len))
1642 return 0;
1643
9c70220b 1644 msg = (struct nd_msg *)skb_transport_header(skb);
1da177e4 1645
9c70220b 1646 __skb_push(skb, skb->data - skb_transport_header(skb));
1da177e4 1647
0660e03f 1648 if (ipv6_hdr(skb)->hop_limit != 255) {
1da177e4
LT		 1649 ND_PRINTK2(KERN_WARNING
1650 "ICMPv6 NDISC: invalid hop-limit: %d\n",
0660e03f 1651 ipv6_hdr(skb)->hop_limit);
1da177e4
LT		 1652 return 0;
1653 }
1654
1655 if (msg->icmph.icmp6_code != 0) {
1ab1457c 1656 ND_PRINTK2(KERN_WARNING
1da177e4
LT		 1657 "ICMPv6 NDISC: invalid ICMPv6 code: %d\n",
1658 msg->icmph.icmp6_code);
1659 return 0;
1660 }
1661
a61bbcf2
PM		 1662 memset(NEIGH_CB(skb), 0, sizeof(struct neighbour_cb));
1663
1da177e4
LT		 1664 switch (msg->icmph.icmp6_type) {
1665 case NDISC_NEIGHBOUR_SOLICITATION:
1666 ndisc_recv_ns(skb);
1667 break;
1668
1669 case NDISC_NEIGHBOUR_ADVERTISEMENT:
1670 ndisc_recv_na(skb);
1671 break;
1672
1673 case NDISC_ROUTER_SOLICITATION:
1674 ndisc_recv_rs(skb);
1675 break;
1676
1677 case NDISC_ROUTER_ADVERTISEMENT:
1678 ndisc_router_discovery(skb);
1679 break;
1680
1681 case NDISC_REDIRECT:
1682 ndisc_redirect_rcv(skb);
1683 break;
3ff50b79 1684 }
1da177e4
LT		 1685
1686 return 0;
1687}
1688
1689static int ndisc_netdev_event(struct notifier_block *this, unsigned long event, void *ptr)
1690{
1691 struct net_device *dev = ptr;
c346dca1 1692 struct net *net = dev_net(dev);
1da177e4
LT		 1693
1694 switch (event) {
1695 case NETDEV_CHANGEADDR:
1696 neigh_changeaddr(&nd_tbl, dev);
5b7c931d 1697 fib6_run_gc(~0UL, net);
1da177e4
LT		 1698 break;
1699 case NETDEV_DOWN:
1700 neigh_ifdown(&nd_tbl, dev);
5b7c931d 1701 fib6_run_gc(~0UL, net);
1da177e4
LT		 1702 break;
1703 default:
1704 break;
1705 }
1706
1707 return NOTIFY_DONE;
1708}
1709
1710static struct notifier_block ndisc_netdev_notifier = {
1711 .notifier_call = ndisc_netdev_event,
1712};
1713
1714#ifdef CONFIG_SYSCTL
1715static void ndisc_warn_deprecated_sysctl(struct ctl_table *ctl,
1716 const char *func, const char *dev_name)
1717{
1718 static char warncomm[TASK_COMM_LEN];
1719 static int warned;
1720 if (strcmp(warncomm, current->comm) && warned < 5) {
1721 strcpy(warncomm, current->comm);
1722 printk(KERN_WARNING
1723 "process `%s' is using deprecated sysctl (%s) "
1724 "net.ipv6.neigh.%s.%s; "
1725 "Use net.ipv6.neigh.%s.%s_ms "
1726 "instead.\n",
1727 warncomm, func,
1728 dev_name, ctl->procname,
1729 dev_name, ctl->procname);
1730 warned++;
1731 }
1732}
1733
1734int ndisc_ifinfo_sysctl_change(struct ctl_table *ctl, int write, struct file * filp, void __user *buffer, size_t *lenp, loff_t *ppos)
1735{
1736 struct net_device *dev = ctl->extra1;
1737 struct inet6_dev *idev;
1738 int ret;
1739
d12af679
EB		 1740 if ((strcmp(ctl->procname, "retrans_time") == 0) ||
1741 (strcmp(ctl->procname, "base_reachable_time") == 0))
1da177e4
LT		 1742 ndisc_warn_deprecated_sysctl(ctl, "syscall", dev ? dev->name : "default");
1743
d12af679 1744 if (strcmp(ctl->procname, "retrans_time") == 0)
1da177e4 1745 ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
d12af679
EB		 1746
1747 else if (strcmp(ctl->procname, "base_reachable_time") == 0)
1da177e4
LT		 1748 ret = proc_dointvec_jiffies(ctl, write,
1749 filp, buffer, lenp, ppos);
d12af679
EB		 1750
1751 else if ((strcmp(ctl->procname, "retrans_time_ms") == 0) ||
ad02ac14 1752 (strcmp(ctl->procname, "base_reachable_time_ms") == 0))
1da177e4
LT		 1753 ret = proc_dointvec_ms_jiffies(ctl, write,
1754 filp, buffer, lenp, ppos);
d12af679 1755 else
1da177e4 1756 ret = -1;
1da177e4
LT		 1757
1758 if (write && ret == 0 && dev && (idev = in6_dev_get(dev)) != NULL) {
d12af679 1759 if (ctl->data == &idev->nd_parms->base_reachable_time)
1da177e4
LT		 1760 idev->nd_parms->reachable_time = neigh_rand_reach_time(idev->nd_parms->base_reachable_time);
1761 idev->tstamp = jiffies;
1762 inet6_ifinfo_notify(RTM_NEWLINK, idev);
1763 in6_dev_put(idev);
1764 }
1765 return ret;
1766}
1767
f221e726
AD		 1768int ndisc_ifinfo_sysctl_strategy(ctl_table *ctl,
1769 void __user *oldval, size_t __user *oldlenp,
0686caa3 1770 void __user *newval, size_t newlen)
1da177e4
LT		 1771{
1772 struct net_device *dev = ctl->extra1;
1773 struct inet6_dev *idev;
1774 int ret;
1775
1776 if (ctl->ctl_name == NET_NEIGH_RETRANS_TIME ||
1777 ctl->ctl_name == NET_NEIGH_REACHABLE_TIME)
1778 ndisc_warn_deprecated_sysctl(ctl, "procfs", dev ? dev->name : "default");
1779
1780 switch (ctl->ctl_name) {
1781 case NET_NEIGH_REACHABLE_TIME:
f221e726 1782 ret = sysctl_jiffies(ctl, oldval, oldlenp, newval, newlen);
1da177e4
LT		 1783 break;
1784 case NET_NEIGH_RETRANS_TIME_MS:
1785 case NET_NEIGH_REACHABLE_TIME_MS:
f221e726 1786 ret = sysctl_ms_jiffies(ctl, oldval, oldlenp, newval, newlen);
1da177e4
LT		 1787 break;
1788 default:
1789 ret = 0;
1790 }
1791
1792 if (newval && newlen && ret > 0 &&
1793 dev && (idev = in6_dev_get(dev)) != NULL) {
1794 if (ctl->ctl_name == NET_NEIGH_REACHABLE_TIME ||
1795 ctl->ctl_name == NET_NEIGH_REACHABLE_TIME_MS)
1796 idev->nd_parms->reachable_time = neigh_rand_reach_time(idev->nd_parms->base_reachable_time);
1797 idev->tstamp = jiffies;
1798 inet6_ifinfo_notify(RTM_NEWLINK, idev);
1799 in6_dev_put(idev);
1800 }
1801
1802 return ret;
1803}
1804
1805#endif
1806
1762f7e8 1807static int ndisc_net_init(struct net *net)
1da177e4
LT		 1808{
1809 struct ipv6_pinfo *np;
1810 struct sock *sk;
1ab1457c 1811 int err;
1da177e4 1812
1ed8516f
DL		 1813 err = inet_ctl_sock_create(&sk, PF_INET6,
1814 SOCK_RAW, IPPROTO_ICMPV6, net);
1da177e4
LT		 1815 if (err < 0) {
1816 ND_PRINTK0(KERN_ERR
1ab1457c 1817 "ICMPv6 NDISC: Failed to initialize the control socket (err %d).\n",
1da177e4 1818 err);
1da177e4
LT		 1819 return err;
1820 }
1821
1ed8516f 1822 net->ipv6.ndisc_sk = sk;
1762f7e8 1823
1da177e4 1824 np = inet6_sk(sk);
1da177e4
LT		 1825 np->hop_limit = 255;
1826 /* Do not loopback ndisc messages */
1827 np->mc_loop = 0;
1da177e4 1828
1762f7e8
DL		 1829 return 0;
1830}
1831
1832static void ndisc_net_exit(struct net *net)
1833{
1ed8516f 1834 inet_ctl_sock_destroy(net->ipv6.ndisc_sk);
1762f7e8
DL		 1835}
1836
1837static struct pernet_operations ndisc_net_ops = {
1838 .init = ndisc_net_init,
1839 .exit = ndisc_net_exit,
1840};
1841
1842int __init ndisc_init(void)
1843{
1844 int err;
1845
1846 err = register_pernet_subsys(&ndisc_net_ops);
1847 if (err)
1848 return err;
1ab1457c
YH		 1849 /*
1850 * Initialize the neighbour table
1851 */
1da177e4
LT		 1852 neigh_table_init(&nd_tbl);
1853
1854#ifdef CONFIG_SYSCTL
1762f7e8
DL		 1855 err = neigh_sysctl_register(NULL, &nd_tbl.parms, NET_IPV6,
1856 NET_IPV6_NEIGH, "ipv6",
1857 &ndisc_ifinfo_sysctl_change,
1858 &ndisc_ifinfo_sysctl_strategy);
1859 if (err)
1860 goto out_unregister_pernet;
1da177e4 1861#endif
1762f7e8
DL		 1862 err = register_netdevice_notifier(&ndisc_netdev_notifier);
1863 if (err)
1864 goto out_unregister_sysctl;
1865out:
1866 return err;
1da177e4 1867
1762f7e8
DL		 1868out_unregister_sysctl:
1869#ifdef CONFIG_SYSCTL
1870 neigh_sysctl_unregister(&nd_tbl.parms);
1871out_unregister_pernet:
1872#endif
1873 unregister_pernet_subsys(&ndisc_net_ops);
1874 goto out;
1da177e4
LT		 1875}
1876
1877void ndisc_cleanup(void)
1878{
36f73d0c 1879 unregister_netdevice_notifier(&ndisc_netdev_notifier);
1da177e4
LT		 1880#ifdef CONFIG_SYSCTL
1881 neigh_sysctl_unregister(&nd_tbl.parms);
1882#endif
1883 neigh_table_clear(&nd_tbl);
1762f7e8 1884 unregister_pernet_subsys(&ndisc_net_ops);
1da177e4 1885}
Clone of davem's net-next-2.6 tree