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jme: Fix FIFO flush issue
[GitHub/mt8127/android_kernel_alcatel_ttab.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>
5a0e3ad6 62#include <linux/slab.h>
1da177e4
LT		 63#ifdef CONFIG_SYSCTL
64#include <linux/sysctl.h>
65#endif
66
1823730f 67#include <linux/if_addr.h>
1da177e4
LT		 68#include <linux/if_arp.h>
69#include <linux/ipv6.h>
70#include <linux/icmpv6.h>
71#include <linux/jhash.h>
72
73#include <net/sock.h>
74#include <net/snmp.h>
75
76#include <net/ipv6.h>
77#include <net/protocol.h>
78#include <net/ndisc.h>
79#include <net/ip6_route.h>
80#include <net/addrconf.h>
81#include <net/icmp.h>
82
31910575
PY		 83#include <net/netlink.h>
84#include <linux/rtnetlink.h>
85
1da177e4
LT		 86#include <net/flow.h>
87#include <net/ip6_checksum.h>
1ed8516f 88#include <net/inet_common.h>
1da177e4
LT		 89#include <linux/proc_fs.h>
90
91#include <linux/netfilter.h>
92#include <linux/netfilter_ipv6.h>
93
d6bf7817
ED		 94static u32 ndisc_hash(const void *pkey,
95 const struct net_device *dev,
2c2aba6c 96 __u32 *hash_rnd);
1da177e4
LT		 97static int ndisc_constructor(struct neighbour *neigh);
98static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb);
99static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb);
100static int pndisc_constructor(struct pneigh_entry *n);
101static void pndisc_destructor(struct pneigh_entry *n);
102static void pndisc_redo(struct sk_buff *skb);
103
89d69d2b 104static const struct neigh_ops ndisc_generic_ops = {
1da177e4
LT		 105 .family = AF_INET6,
106 .solicit = ndisc_solicit,
107 .error_report = ndisc_error_report,
108 .output = neigh_resolve_output,
109 .connected_output = neigh_connected_output,
1da177e4
LT		 110};
111
89d69d2b 112static const struct neigh_ops ndisc_hh_ops = {
1da177e4
LT		 113 .family = AF_INET6,
114 .solicit = ndisc_solicit,
115 .error_report = ndisc_error_report,
116 .output = neigh_resolve_output,
117 .connected_output = neigh_resolve_output,
1da177e4
LT		 118};
119
120
89d69d2b 121static const struct neigh_ops ndisc_direct_ops = {
1da177e4 122 .family = AF_INET6,
8f40b161
DM		 123 .output = neigh_direct_output,
124 .connected_output = neigh_direct_output,
1da177e4
LT		 125};
126
127struct neigh_table nd_tbl = {
128 .family = AF_INET6,
1da177e4
LT		 129 .key_len = sizeof(struct in6_addr),
130 .hash = ndisc_hash,
131 .constructor = ndisc_constructor,
132 .pconstructor = pndisc_constructor,
133 .pdestructor = pndisc_destructor,
134 .proxy_redo = pndisc_redo,
135 .id = "ndisc_cache",
136 .parms = {
b672083e
SW		 137 .tbl = &nd_tbl,
138 .base_reachable_time = ND_REACHABLE_TIME,
139 .retrans_time = ND_RETRANS_TIMER,
140 .gc_staletime = 60 * HZ,
141 .reachable_time = ND_REACHABLE_TIME,
142 .delay_probe_time = 5 * HZ,
8b5c171b 143 .queue_len_bytes = 64*1024,
b672083e
SW		 144 .ucast_probes = 3,
145 .mcast_probes = 3,
146 .anycast_delay = 1 * HZ,
147 .proxy_delay = (8 * HZ) / 10,
148 .proxy_qlen = 64,
1da177e4
LT		 149 },
150 .gc_interval = 30 * HZ,
151 .gc_thresh1 = 128,
152 .gc_thresh2 = 512,
153 .gc_thresh3 = 1024,
154};
155
156/* ND options */
157struct ndisc_options {
70ceb4f5
YH		 158 struct nd_opt_hdr *nd_opt_array[__ND_OPT_ARRAY_MAX];
159#ifdef CONFIG_IPV6_ROUTE_INFO
160 struct nd_opt_hdr *nd_opts_ri;
161 struct nd_opt_hdr *nd_opts_ri_end;
162#endif
31910575
PY		 163 struct nd_opt_hdr *nd_useropts;
164 struct nd_opt_hdr *nd_useropts_end;
1da177e4
LT		 165};
166
167#define nd_opts_src_lladdr nd_opt_array[ND_OPT_SOURCE_LL_ADDR]
168#define nd_opts_tgt_lladdr nd_opt_array[ND_OPT_TARGET_LL_ADDR]
169#define nd_opts_pi nd_opt_array[ND_OPT_PREFIX_INFO]
170#define nd_opts_pi_end nd_opt_array[__ND_OPT_PREFIX_INFO_END]
171#define nd_opts_rh nd_opt_array[ND_OPT_REDIRECT_HDR]
172#define nd_opts_mtu nd_opt_array[ND_OPT_MTU]
173
174#define NDISC_OPT_SPACE(len) (((len)+2+7)&~7)
175
176/*
177 * Return the padding between the option length and the start of the
178 * link addr. Currently only IP-over-InfiniBand needs this, although
179 * if RFC 3831 IPv6-over-Fibre Channel is ever implemented it may
180 * also need a pad of 2.
181 */
182static int ndisc_addr_option_pad(unsigned short type)
183{
184 switch (type) {
185 case ARPHRD_INFINIBAND: return 2;
186 default: return 0;
187 }
188}
189
190static inline int ndisc_opt_addr_space(struct net_device *dev)
191{
192 return NDISC_OPT_SPACE(dev->addr_len + ndisc_addr_option_pad(dev->type));
193}
194
195static u8 *ndisc_fill_addr_option(u8 *opt, int type, void *data, int data_len,
196 unsigned short addr_type)
197{
198 int space = NDISC_OPT_SPACE(data_len);
199 int pad = ndisc_addr_option_pad(addr_type);
200
201 opt[0] = type;
202 opt[1] = space>>3;
203
204 memset(opt + 2, 0, pad);
205 opt += pad;
206 space -= pad;
207
208 memcpy(opt+2, data, data_len);
209 data_len += 2;
210 opt += data_len;
211 if ((space -= data_len) > 0)
212 memset(opt, 0, space);
213 return opt + space;
214}
215
216static struct nd_opt_hdr *ndisc_next_option(struct nd_opt_hdr *cur,
217 struct nd_opt_hdr *end)
218{
219 int type;
220 if (!cur || !end || cur >= end)
221 return NULL;
222 type = cur->nd_opt_type;
223 do {
224 cur = ((void *)cur) + (cur->nd_opt_len << 3);
225 } while(cur < end && cur->nd_opt_type != type);
a02cec21 226 return cur <= end && cur->nd_opt_type == type ? cur : NULL;
1da177e4
LT		 227}
228
31910575
PY		 229static inline int ndisc_is_useropt(struct nd_opt_hdr *opt)
230{
a02cec21 231 return opt->nd_opt_type == ND_OPT_RDNSS;
31910575
PY		 232}
233
234static struct nd_opt_hdr *ndisc_next_useropt(struct nd_opt_hdr *cur,
235 struct nd_opt_hdr *end)
236{
237 if (!cur || !end || cur >= end)
238 return NULL;
239 do {
240 cur = ((void *)cur) + (cur->nd_opt_len << 3);
241 } while(cur < end && !ndisc_is_useropt(cur));
a02cec21 242 return cur <= end && ndisc_is_useropt(cur) ? cur : NULL;
31910575
PY		 243}
244
1da177e4
LT		 245static struct ndisc_options *ndisc_parse_options(u8 *opt, int opt_len,
246 struct ndisc_options *ndopts)
247{
248 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)opt;
249
250 if (!nd_opt || opt_len < 0 || !ndopts)
251 return NULL;
252 memset(ndopts, 0, sizeof(*ndopts));
253 while (opt_len) {
254 int l;
255 if (opt_len < sizeof(struct nd_opt_hdr))
256 return NULL;
257 l = nd_opt->nd_opt_len << 3;
258 if (opt_len < l || l == 0)
259 return NULL;
260 switch (nd_opt->nd_opt_type) {
261 case ND_OPT_SOURCE_LL_ADDR:
262 case ND_OPT_TARGET_LL_ADDR:
263 case ND_OPT_MTU:
264 case ND_OPT_REDIRECT_HDR:
265 if (ndopts->nd_opt_array[nd_opt->nd_opt_type]) {
266 ND_PRINTK2(KERN_WARNING
267 "%s(): duplicated ND6 option found: type=%d\n",
0dc47877 268 __func__,
1da177e4
LT		 269 nd_opt->nd_opt_type);
270 } else {
271 ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt;
272 }
273 break;
274 case ND_OPT_PREFIX_INFO:
275 ndopts->nd_opts_pi_end = nd_opt;
cfcabdcc 276 if (!ndopts->nd_opt_array[nd_opt->nd_opt_type])
1da177e4
LT		 277 ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt;
278 break;
70ceb4f5
YH		 279#ifdef CONFIG_IPV6_ROUTE_INFO
280 case ND_OPT_ROUTE_INFO:
281 ndopts->nd_opts_ri_end = nd_opt;
282 if (!ndopts->nd_opts_ri)
283 ndopts->nd_opts_ri = nd_opt;
284 break;
285#endif
1da177e4 286 default:
31910575
PY		 287 if (ndisc_is_useropt(nd_opt)) {
288 ndopts->nd_useropts_end = nd_opt;
289 if (!ndopts->nd_useropts)
290 ndopts->nd_useropts = nd_opt;
291 } else {
292 /*
293 * Unknown options must be silently ignored,
294 * to accommodate future extension to the
295 * protocol.
296 */
297 ND_PRINTK2(KERN_NOTICE
298 "%s(): ignored unsupported option; type=%d, len=%d\n",
0dc47877 299 __func__,
31910575
PY		 300 nd_opt->nd_opt_type, nd_opt->nd_opt_len);
301 }
1da177e4
LT		 302 }
303 opt_len -= l;
304 nd_opt = ((void *)nd_opt) + l;
305 }
306 return ndopts;
307}
308
309static inline u8 *ndisc_opt_addr_data(struct nd_opt_hdr *p,
310 struct net_device *dev)
311{
312 u8 *lladdr = (u8 *)(p + 1);
313 int lladdrlen = p->nd_opt_len << 3;
314 int prepad = ndisc_addr_option_pad(dev->type);
315 if (lladdrlen != NDISC_OPT_SPACE(dev->addr_len + prepad))
316 return NULL;
a02cec21 317 return lladdr + prepad;
1da177e4
LT		 318}
319
b71d1d42 320int ndisc_mc_map(const struct in6_addr *addr, char *buf, struct net_device *dev, int dir)
1da177e4
LT		 321{
322 switch (dev->type) {
323 case ARPHRD_ETHER:
324 case ARPHRD_IEEE802: /* Not sure. Check it later. --ANK */
325 case ARPHRD_FDDI:
326 ipv6_eth_mc_map(addr, buf);
327 return 0;
328 case ARPHRD_IEEE802_TR:
329 ipv6_tr_mc_map(addr,buf);
330 return 0;
331 case ARPHRD_ARCNET:
332 ipv6_arcnet_mc_map(addr, buf);
333 return 0;
334 case ARPHRD_INFINIBAND:
a9e527e3 335 ipv6_ib_mc_map(addr, dev->broadcast, buf);
1da177e4 336 return 0;
93ca3bb5
TT		 337 case ARPHRD_IPGRE:
338 return ipv6_ipgre_mc_map(addr, dev->broadcast, buf);
1da177e4
LT		 339 default:
340 if (dir) {
341 memcpy(buf, dev->broadcast, dev->addr_len);
342 return 0;
343 }
344 }
345 return -EINVAL;
346}
347
7159039a
YH		 348EXPORT_SYMBOL(ndisc_mc_map);
349
d6bf7817
ED		 350static u32 ndisc_hash(const void *pkey,
351 const struct net_device *dev,
2c2aba6c 352 __u32 *hash_rnd)
1da177e4 353{
2c2aba6c 354 return ndisc_hashfn(pkey, dev, hash_rnd);
1da177e4
LT		 355}
356
357static int ndisc_constructor(struct neighbour *neigh)
358{
359 struct in6_addr *addr = (struct in6_addr*)&neigh->primary_key;
360 struct net_device *dev = neigh->dev;
361 struct inet6_dev *in6_dev;
362 struct neigh_parms *parms;
363 int is_multicast = ipv6_addr_is_multicast(addr);
364
1da177e4
LT		 365 in6_dev = in6_dev_get(dev);
366 if (in6_dev == NULL) {
1da177e4
LT		 367 return -EINVAL;
368 }
369
370 parms = in6_dev->nd_parms;
371 __neigh_parms_put(neigh->parms);
372 neigh->parms = neigh_parms_clone(parms);
1da177e4
LT		 373
374 neigh->type = is_multicast ? RTN_MULTICAST : RTN_UNICAST;
3b04ddde 375 if (!dev->header_ops) {
1da177e4
LT		 376 neigh->nud_state = NUD_NOARP;
377 neigh->ops = &ndisc_direct_ops;
8f40b161 378 neigh->output = neigh_direct_output;
1da177e4
LT		 379 } else {
380 if (is_multicast) {
381 neigh->nud_state = NUD_NOARP;
382 ndisc_mc_map(addr, neigh->ha, dev, 1);
383 } else if (dev->flags&(IFF_NOARP|IFF_LOOPBACK)) {
384 neigh->nud_state = NUD_NOARP;
385 memcpy(neigh->ha, dev->dev_addr, dev->addr_len);
386 if (dev->flags&IFF_LOOPBACK)
387 neigh->type = RTN_LOCAL;
388 } else if (dev->flags&IFF_POINTOPOINT) {
389 neigh->nud_state = NUD_NOARP;
390 memcpy(neigh->ha, dev->broadcast, dev->addr_len);
391 }
3b04ddde 392 if (dev->header_ops->cache)
1da177e4
LT		 393 neigh->ops = &ndisc_hh_ops;
394 else
395 neigh->ops = &ndisc_generic_ops;
396 if (neigh->nud_state&NUD_VALID)
397 neigh->output = neigh->ops->connected_output;
398 else
399 neigh->output = neigh->ops->output;
400 }
401 in6_dev_put(in6_dev);
402 return 0;
403}
404
405static int pndisc_constructor(struct pneigh_entry *n)
406{
407 struct in6_addr *addr = (struct in6_addr*)&n->key;
408 struct in6_addr maddr;
409 struct net_device *dev = n->dev;
410
411 if (dev == NULL || __in6_dev_get(dev) == NULL)
412 return -EINVAL;
413 addrconf_addr_solict_mult(addr, &maddr);
414 ipv6_dev_mc_inc(dev, &maddr);
415 return 0;
416}
417
418static void pndisc_destructor(struct pneigh_entry *n)
419{
420 struct in6_addr *addr = (struct in6_addr*)&n->key;
421 struct in6_addr maddr;
422 struct net_device *dev = n->dev;
423
424 if (dev == NULL || __in6_dev_get(dev) == NULL)
425 return;
426 addrconf_addr_solict_mult(addr, &maddr);
427 ipv6_dev_mc_dec(dev, &maddr);
428}
429
305d552a
BH		 430struct sk_buff *ndisc_build_skb(struct net_device *dev,
431 const struct in6_addr *daddr,
432 const struct in6_addr *saddr,
433 struct icmp6hdr *icmp6h,
434 const struct in6_addr *target,
435 int llinfo)
1da177e4 436{
c346dca1 437 struct net *net = dev_net(dev);
1762f7e8 438 struct sock *sk = net->ipv6.ndisc_sk;
1ab1457c 439 struct sk_buff *skb;
e1ec7842 440 struct icmp6hdr *hdr;
a7ae1992
HX		 441 int hlen = LL_RESERVED_SPACE(dev);
442 int tlen = dev->needed_tailroom;
e1ec7842 443 int len;
1da177e4 444 int err;
305d552a 445 u8 *opt;
1da177e4 446
e1ec7842
YH		 447 if (!dev->addr_len)
448 llinfo = 0;
449
450 len = sizeof(struct icmp6hdr) + (target ? sizeof(*target) : 0);
451 if (llinfo)
452 len += ndisc_opt_addr_space(dev);
1da177e4 453
d54a81d3
DM		 454 skb = sock_alloc_send_skb(sk,
455 (MAX_HEADER + sizeof(struct ipv6hdr) +
a7ae1992 456 len + hlen + tlen),
1da177e4 457 1, &err);
e1ec7842 458 if (!skb) {
1da177e4 459 ND_PRINTK0(KERN_ERR
dae9de8e
BH		 460 "ICMPv6 ND: %s() failed to allocate an skb, err=%d.\n",
461 __func__, err);
305d552a 462 return NULL;
1da177e4
LT		 463 }
464
a7ae1992 465 skb_reserve(skb, hlen);
e1ec7842 466 ip6_nd_hdr(sk, skb, dev, saddr, daddr, IPPROTO_ICMPV6, len);
1da177e4 467
27a884dc 468 skb->transport_header = skb->tail;
d10ba34b 469 skb_put(skb, len);
1da177e4 470
e1ec7842
YH		 471 hdr = (struct icmp6hdr *)skb_transport_header(skb);
472 memcpy(hdr, icmp6h, sizeof(*hdr));
1da177e4 473
e1ec7842
YH		 474 opt = skb_transport_header(skb) + sizeof(struct icmp6hdr);
475 if (target) {
4e3fd7a0 476 *(struct in6_addr *)opt = *target;
e1ec7842
YH		 477 opt += sizeof(*target);
478 }
1da177e4 479
e1ec7842
YH		 480 if (llinfo)
481 ndisc_fill_addr_option(opt, llinfo, dev->dev_addr,
1da177e4
LT		 482 dev->addr_len, dev->type);
483
e1ec7842
YH		 484 hdr->icmp6_cksum = csum_ipv6_magic(saddr, daddr, len,
485 IPPROTO_ICMPV6,
07f0757a 486 csum_partial(hdr,
e1ec7842 487 len, 0));
1da177e4 488
305d552a
BH		 489 return skb;
490}
491
492EXPORT_SYMBOL(ndisc_build_skb);
493
494void ndisc_send_skb(struct sk_buff *skb,
495 struct net_device *dev,
496 struct neighbour *neigh,
497 const struct in6_addr *daddr,
498 const struct in6_addr *saddr,
499 struct icmp6hdr *icmp6h)
500{
4c9483b2 501 struct flowi6 fl6;
305d552a
BH		 502 struct dst_entry *dst;
503 struct net *net = dev_net(dev);
504 struct sock *sk = net->ipv6.ndisc_sk;
505 struct inet6_dev *idev;
506 int err;
507 u8 type;
508
509 type = icmp6h->icmp6_type;
510
4c9483b2 511 icmpv6_flow_init(sk, &fl6, type, saddr, daddr, dev->ifindex);
87a11578 512 dst = icmp6_dst_alloc(dev, neigh, &fl6);
452edd59 513 if (IS_ERR(dst)) {
305d552a
BH		 514 kfree_skb(skb);
515 return;
516 }
517
adf30907 518 skb_dst_set(skb, dst);
e1ec7842 519
cfdf7647
ED		 520 rcu_read_lock();
521 idev = __in6_dev_get(dst->dev);
edf391ff 522 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
e1ec7842 523
b2e0b385 524 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, dst->dev,
6e23ae2a 525 dst_output);
1da177e4 526 if (!err) {
5c5d244b 527 ICMP6MSGOUT_INC_STATS(net, idev, type);
a862f6a6 528 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1da177e4
LT		 529 }
530
cfdf7647 531 rcu_read_unlock();
1ab1457c 532}
1da177e4 533
305d552a
BH		 534EXPORT_SYMBOL(ndisc_send_skb);
535
536/*
537 * Send a Neighbour Discover packet
538 */
539static void __ndisc_send(struct net_device *dev,
540 struct neighbour *neigh,
541 const struct in6_addr *daddr,
542 const struct in6_addr *saddr,
543 struct icmp6hdr *icmp6h, const struct in6_addr *target,
544 int llinfo)
545{
546 struct sk_buff *skb;
547
548 skb = ndisc_build_skb(dev, daddr, saddr, icmp6h, target, llinfo);
549 if (!skb)
550 return;
551
552 ndisc_send_skb(skb, dev, neigh, daddr, saddr, icmp6h);
553}
554
e1ec7842 555static void ndisc_send_na(struct net_device *dev, struct neighbour *neigh,
9acd9f3a
YH		 556 const struct in6_addr *daddr,
557 const struct in6_addr *solicited_addr,
558 int router, int solicited, int override, int inc_opt)
e1ec7842
YH		 559{
560 struct in6_addr tmpaddr;
561 struct inet6_ifaddr *ifp;
9acd9f3a 562 const struct in6_addr *src_addr;
e1ec7842
YH		 563 struct icmp6hdr icmp6h = {
564 .icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT,
565 };
566
567 /* for anycast or proxy, solicited_addr != src_addr */
c346dca1 568 ifp = ipv6_get_ifaddr(dev_net(dev), solicited_addr, dev, 1);
e1ec7842
YH		 569 if (ifp) {
570 src_addr = solicited_addr;
571 if (ifp->flags & IFA_F_OPTIMISTIC)
572 override = 0;
9f888160 573 inc_opt |= ifp->idev->cnf.force_tllao;
e1ec7842
YH		 574 in6_ifa_put(ifp);
575 } else {
191cd582 576 if (ipv6_dev_get_saddr(dev_net(dev), dev, daddr,
c346dca1 577 inet6_sk(dev_net(dev)->ipv6.ndisc_sk)->srcprefs,
7cbca67c 578 &tmpaddr))
e1ec7842
YH		 579 return;
580 src_addr = &tmpaddr;
581 }
582
583 icmp6h.icmp6_router = router;
584 icmp6h.icmp6_solicited = solicited;
585 icmp6h.icmp6_override = override;
586
587 __ndisc_send(dev, neigh, daddr, src_addr,
588 &icmp6h, solicited_addr,
14878f75 589 inc_opt ? ND_OPT_TARGET_LL_ADDR : 0);
e1ec7842
YH		 590}
591
f47b9464
BH		 592static void ndisc_send_unsol_na(struct net_device *dev)
593{
594 struct inet6_dev *idev;
595 struct inet6_ifaddr *ifa;
596 struct in6_addr mcaddr;
597
598 idev = in6_dev_get(dev);
599 if (!idev)
600 return;
601
602 read_lock_bh(&idev->lock);
603 list_for_each_entry(ifa, &idev->addr_list, if_list) {
604 addrconf_addr_solict_mult(&ifa->addr, &mcaddr);
605 ndisc_send_na(dev, NULL, &mcaddr, &ifa->addr,
606 /*router=*/ !!idev->cnf.forwarding,
607 /*solicited=*/ false, /*override=*/ true,
608 /*inc_opt=*/ true);
609 }
610 read_unlock_bh(&idev->lock);
611
612 in6_dev_put(idev);
613}
614
1da177e4 615void ndisc_send_ns(struct net_device *dev, struct neighbour *neigh,
9acd9f3a
YH		 616 const struct in6_addr *solicit,
617 const struct in6_addr *daddr, const struct in6_addr *saddr)
1da177e4 618{
1da177e4 619 struct in6_addr addr_buf;
e1ec7842
YH		 620 struct icmp6hdr icmp6h = {
621 .icmp6_type = NDISC_NEIGHBOUR_SOLICITATION,
622 };
1da177e4
LT		 623
624 if (saddr == NULL) {
95c385b4
NH		 625 if (ipv6_get_lladdr(dev, &addr_buf,
626 (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC)))
1da177e4
LT		 627 return;
628 saddr = &addr_buf;
629 }
630
e1ec7842
YH		 631 __ndisc_send(dev, neigh, daddr, saddr,
632 &icmp6h, solicit,
14878f75 633 !ipv6_addr_any(saddr) ? ND_OPT_SOURCE_LL_ADDR : 0);
1da177e4
LT		 634}
635
9acd9f3a
YH		 636void ndisc_send_rs(struct net_device *dev, const struct in6_addr *saddr,
637 const struct in6_addr *daddr)
1da177e4 638{
e1ec7842
YH		 639 struct icmp6hdr icmp6h = {
640 .icmp6_type = NDISC_ROUTER_SOLICITATION,
641 };
95c385b4 642 int send_sllao = dev->addr_len;
95c385b4
NH		 643
644#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
645 /*
646 * According to section 2.2 of RFC 4429, we must not
647 * send router solicitations with a sllao from
648 * optimistic addresses, but we may send the solicitation
649 * if we don't include the sllao. So here we check
650 * if our address is optimistic, and if so, we
bea85195 651 * suppress the inclusion of the sllao.
95c385b4
NH		 652 */
653 if (send_sllao) {
c346dca1 654 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(dev_net(dev), saddr,
1cab3da6 655 dev, 1);
95c385b4
NH		 656 if (ifp) {
657 if (ifp->flags & IFA_F_OPTIMISTIC) {
ca043569 658 send_sllao = 0;
95c385b4 659 }
ca043569 660 in6_ifa_put(ifp);
95c385b4
NH		 661 } else {
662 send_sllao = 0;
663 }
664 }
665#endif
e1ec7842
YH		 666 __ndisc_send(dev, NULL, daddr, saddr,
667 &icmp6h, NULL,
14878f75 668 send_sllao ? ND_OPT_SOURCE_LL_ADDR : 0);
1da177e4 669}
1ab1457c 670
1da177e4
LT		 671
672static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb)
673{
674 /*
675 * "The sender MUST return an ICMP
676 * destination unreachable"
677 */
678 dst_link_failure(skb);
679 kfree_skb(skb);
680}
681
682/* Called with locked neigh: either read or both */
683
684static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb)
685{
686 struct in6_addr *saddr = NULL;
687 struct in6_addr mcaddr;
688 struct net_device *dev = neigh->dev;
689 struct in6_addr *target = (struct in6_addr *)&neigh->primary_key;
690 int probes = atomic_read(&neigh->probes);
691
c346dca1 692 if (skb && ipv6_chk_addr(dev_net(dev), &ipv6_hdr(skb)->saddr, dev, 1))
0660e03f 693 saddr = &ipv6_hdr(skb)->saddr;
1da177e4
LT		 694
695 if ((probes -= neigh->parms->ucast_probes) < 0) {
696 if (!(neigh->nud_state & NUD_VALID)) {
5b095d98 697 ND_PRINTK1(KERN_DEBUG "%s(): trying to ucast probe in NUD_INVALID: %pI6\n",
0c6ce78a 698 __func__, target);
1da177e4
LT		 699 }
700 ndisc_send_ns(dev, neigh, target, target, saddr);
701 } else if ((probes -= neigh->parms->app_probes) < 0) {
702#ifdef CONFIG_ARPD
703 neigh_app_ns(neigh);
704#endif
705 } else {
706 addrconf_addr_solict_mult(target, &mcaddr);
707 ndisc_send_ns(dev, NULL, target, &mcaddr, saddr);
708 }
709}
710
0736ffc0
YH		 711static int pndisc_is_router(const void *pkey,
712 struct net_device *dev)
fa86d322
PE		 713{
714 struct pneigh_entry *n;
0736ffc0 715 int ret = -1;
fa86d322
PE		 716
717 read_lock_bh(&nd_tbl.lock);
0736ffc0
YH		 718 n = __pneigh_lookup(&nd_tbl, dev_net(dev), pkey, dev);
719 if (n)
720 ret = !!(n->flags & NTF_ROUTER);
fa86d322
PE		 721 read_unlock_bh(&nd_tbl.lock);
722
0736ffc0 723 return ret;
fa86d322
PE		 724}
725
1da177e4
LT		 726static void ndisc_recv_ns(struct sk_buff *skb)
727{
9c70220b 728 struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb);
b71d1d42
ED		 729 const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr;
730 const struct in6_addr *daddr = &ipv6_hdr(skb)->daddr;
1da177e4 731 u8 *lladdr = NULL;
27a884dc
ACM		 732 u32 ndoptlen = skb->tail - (skb->transport_header +
733 offsetof(struct nd_msg, opt));
1da177e4
LT		 734 struct ndisc_options ndopts;
735 struct net_device *dev = skb->dev;
736 struct inet6_ifaddr *ifp;
737 struct inet6_dev *idev = NULL;
738 struct neighbour *neigh;
739 int dad = ipv6_addr_any(saddr);
740 int inc;
0736ffc0 741 int is_router = -1;
1da177e4
LT		 742
743 if (ipv6_addr_is_multicast(&msg->target)) {
1ab1457c 744 ND_PRINTK2(KERN_WARNING
1da177e4
LT		 745 "ICMPv6 NS: multicast target address");
746 return;
747 }
748
749 /*
750 * RFC2461 7.1.1:
751 * DAD has to be destined for solicited node multicast address.
752 */
753 if (dad &&
754 !(daddr->s6_addr32[0] == htonl(0xff020000) &&
755 daddr->s6_addr32[1] == htonl(0x00000000) &&
756 daddr->s6_addr32[2] == htonl(0x00000001) &&
757 daddr->s6_addr [12] == 0xff )) {
758 ND_PRINTK2(KERN_WARNING
759 "ICMPv6 NS: bad DAD packet (wrong destination)\n");
760 return;
761 }
762
763 if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) {
1ab1457c 764 ND_PRINTK2(KERN_WARNING
1da177e4
LT		 765 "ICMPv6 NS: invalid ND options\n");
766 return;
767 }
768
769 if (ndopts.nd_opts_src_lladdr) {
770 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, dev);
771 if (!lladdr) {
772 ND_PRINTK2(KERN_WARNING
773 "ICMPv6 NS: invalid link-layer address length\n");
774 return;
775 }
776
777 /* RFC2461 7.1.1:
1ab1457c
YH		 778 * If the IP source address is the unspecified address,
779 * there MUST NOT be source link-layer address option
1da177e4
LT		 780 * in the message.
781 */
782 if (dad) {
1ab1457c 783 ND_PRINTK2(KERN_WARNING
1da177e4
LT		 784 "ICMPv6 NS: bad DAD packet (link-layer address option)\n");
785 return;
786 }
787 }
788
789 inc = ipv6_addr_is_multicast(daddr);
790
c346dca1 791 ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1);
a18bc695 792 if (ifp) {
95c385b4
NH		 793
794 if (ifp->flags & (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC)) {
795 if (dad) {
796 if (dev->type == ARPHRD_IEEE802_TR) {
98e399f8
ACM		 797 const unsigned char *sadr;
798 sadr = skb_mac_header(skb);
95c385b4
NH		 799 if (((sadr[8] ^ dev->dev_addr[0]) & 0x7f) == 0 &&
800 sadr[9] == dev->dev_addr[1] &&
801 sadr[10] == dev->dev_addr[2] &&
802 sadr[11] == dev->dev_addr[3] &&
803 sadr[12] == dev->dev_addr[4] &&
804 sadr[13] == dev->dev_addr[5]) {
805 /* looped-back to us */
806 goto out;
807 }
808 }
809
810 /*
811 * We are colliding with another node
812 * who is doing DAD
813 * so fail our DAD process
814 */
815 addrconf_dad_failure(ifp);
9e3be4b3 816 return;
95c385b4
NH		 817 } else {
818 /*
819 * This is not a dad solicitation.
820 * If we are an optimistic node,
821 * we should respond.
822 * Otherwise, we should ignore it.
823 */
824 if (!(ifp->flags & IFA_F_OPTIMISTIC))
1da177e4 825 goto out;
1da177e4 826 }
1da177e4
LT		 827 }
828
829 idev = ifp->idev;
830 } else {
53b7997f
YH		 831 struct net *net = dev_net(dev);
832
1da177e4
LT		 833 idev = in6_dev_get(dev);
834 if (!idev) {
835 /* XXX: count this drop? */
836 return;
837 }
838
53b7997f 839 if (ipv6_chk_acast_addr(net, dev, &msg->target) ||
1ab1457c 840 (idev->cnf.forwarding &&
53b7997f 841 (net->ipv6.devconf_all->proxy_ndp || idev->cnf.proxy_ndp) &&
0736ffc0 842 (is_router = pndisc_is_router(&msg->target, dev)) >= 0)) {
a61bbcf2 843 if (!(NEIGH_CB(skb)->flags & LOCALLY_ENQUEUED) &&
1da177e4
LT		 844 skb->pkt_type != PACKET_HOST &&
845 inc != 0 &&
846 idev->nd_parms->proxy_delay != 0) {
847 /*
848 * for anycast or proxy,
1ab1457c
YH		 849 * sender should delay its response
850 * by a random time between 0 and
1da177e4
LT		 851 * MAX_ANYCAST_DELAY_TIME seconds.
852 * (RFC2461) -- yoshfuji
853 */
854 struct sk_buff *n = skb_clone(skb, GFP_ATOMIC);
855 if (n)
856 pneigh_enqueue(&nd_tbl, idev->nd_parms, n);
857 goto out;
858 }
859 } else
860 goto out;
861 }
862
0736ffc0
YH		 863 if (is_router < 0)
864 is_router = !!idev->cnf.forwarding;
62dd9318 865
1da177e4 866 if (dad) {
f3ee4010 867 ndisc_send_na(dev, NULL, &in6addr_linklocal_allnodes, &msg->target,
62dd9318 868 is_router, 0, (ifp != NULL), 1);
1da177e4
LT		 869 goto out;
870 }
871
872 if (inc)
873 NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_mcast);
874 else
875 NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_ucast);
876
1ab1457c 877 /*
1da177e4
LT		 878 * update / create cache entry
879 * for the source address
880 */
881 neigh = __neigh_lookup(&nd_tbl, saddr, dev,
882 !inc || lladdr || !dev->addr_len);
883 if (neigh)
1ab1457c 884 neigh_update(neigh, lladdr, NUD_STALE,
1da177e4
LT		 885 NEIGH_UPDATE_F_WEAK_OVERRIDE|
886 NEIGH_UPDATE_F_OVERRIDE);
3b04ddde 887 if (neigh || !dev->header_ops) {
1da177e4 888 ndisc_send_na(dev, neigh, saddr, &msg->target,
62dd9318 889 is_router,
1da177e4
LT		 890 1, (ifp != NULL && inc), inc);
891 if (neigh)
892 neigh_release(neigh);
893 }
894
895out:
896 if (ifp)
897 in6_ifa_put(ifp);
898 else
899 in6_dev_put(idev);
1da177e4
LT		 900}
901
902static void ndisc_recv_na(struct sk_buff *skb)
903{
9c70220b 904 struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb);
b71d1d42
ED		 905 const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr;
906 const struct in6_addr *daddr = &ipv6_hdr(skb)->daddr;
1da177e4 907 u8 *lladdr = NULL;
27a884dc
ACM		 908 u32 ndoptlen = skb->tail - (skb->transport_header +
909 offsetof(struct nd_msg, opt));
1da177e4
LT		 910 struct ndisc_options ndopts;
911 struct net_device *dev = skb->dev;
912 struct inet6_ifaddr *ifp;
913 struct neighbour *neigh;
914
915 if (skb->len < sizeof(struct nd_msg)) {
916 ND_PRINTK2(KERN_WARNING
917 "ICMPv6 NA: packet too short\n");
918 return;
919 }
920
921 if (ipv6_addr_is_multicast(&msg->target)) {
922 ND_PRINTK2(KERN_WARNING
923 "ICMPv6 NA: target address is multicast.\n");
924 return;
925 }
926
927 if (ipv6_addr_is_multicast(daddr) &&
928 msg->icmph.icmp6_solicited) {
929 ND_PRINTK2(KERN_WARNING
930 "ICMPv6 NA: solicited NA is multicasted.\n");
931 return;
932 }
1ab1457c 933
1da177e4
LT		 934 if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) {
935 ND_PRINTK2(KERN_WARNING
936 "ICMPv6 NS: invalid ND option\n");
937 return;
938 }
939 if (ndopts.nd_opts_tgt_lladdr) {
940 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, dev);
941 if (!lladdr) {
942 ND_PRINTK2(KERN_WARNING
943 "ICMPv6 NA: invalid link-layer address length\n");
944 return;
945 }
946 }
c346dca1 947 ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1);
a18bc695 948 if (ifp) {
bd015928
DW		 949 if (skb->pkt_type != PACKET_LOOPBACK
950 && (ifp->flags & IFA_F_TENTATIVE)) {
951 addrconf_dad_failure(ifp);
952 return;
1da177e4
LT		 953 }
954 /* What should we make now? The advertisement
955 is invalid, but ndisc specs say nothing
956 about it. It could be misconfiguration, or
957 an smart proxy agent tries to help us :-)
24fc7b86
JS		 958
959 We should not print the error if NA has been
960 received from loopback - it is just our own
961 unsolicited advertisement.
1da177e4 962 */
24fc7b86
JS		 963 if (skb->pkt_type != PACKET_LOOPBACK)
964 ND_PRINTK1(KERN_WARNING
a6fa3286
JR		 965 "ICMPv6 NA: someone advertises our address %pI6 on %s!\n",
966 &ifp->addr, ifp->idev->dev->name);
1da177e4
LT		 967 in6_ifa_put(ifp);
968 return;
969 }
970 neigh = neigh_lookup(&nd_tbl, &msg->target, dev);
971
972 if (neigh) {
973 u8 old_flags = neigh->flags;
53b7997f 974 struct net *net = dev_net(dev);
1da177e4
LT		 975
976 if (neigh->nud_state & NUD_FAILED)
977 goto out;
978
5f3e6e9e
VN		 979 /*
980 * Don't update the neighbor cache entry on a proxy NA from
981 * ourselves because either the proxied node is off link or it
982 * has already sent a NA to us.
983 */
984 if (lladdr && !memcmp(lladdr, dev->dev_addr, dev->addr_len) &&
53b7997f
YH		 985 net->ipv6.devconf_all->forwarding && net->ipv6.devconf_all->proxy_ndp &&
986 pneigh_lookup(&nd_tbl, net, &msg->target, dev, 0)) {
fbea49e1 987 /* XXX: idev->cnf.prixy_ndp */
5f3e6e9e 988 goto out;
fbea49e1 989 }
5f3e6e9e 990
1da177e4
LT		 991 neigh_update(neigh, lladdr,
992 msg->icmph.icmp6_solicited ? NUD_REACHABLE : NUD_STALE,
993 NEIGH_UPDATE_F_WEAK_OVERRIDE|
994 (msg->icmph.icmp6_override ? NEIGH_UPDATE_F_OVERRIDE : 0)|
995 NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
996 (msg->icmph.icmp6_router ? NEIGH_UPDATE_F_ISROUTER : 0));
997
998 if ((old_flags & ~neigh->flags) & NTF_ROUTER) {
999 /*
1000 * Change: router to host
1001 */
1002 struct rt6_info *rt;
1003 rt = rt6_get_dflt_router(saddr, dev);
1004 if (rt)
e0a1ad73 1005 ip6_del_rt(rt);
1da177e4
LT		 1006 }
1007
1008out:
1009 neigh_release(neigh);
1010 }
1011}
1012
1013static void ndisc_recv_rs(struct sk_buff *skb)
1014{
9c70220b 1015 struct rs_msg *rs_msg = (struct rs_msg *)skb_transport_header(skb);
1da177e4
LT		 1016 unsigned long ndoptlen = skb->len - sizeof(*rs_msg);
1017 struct neighbour *neigh;
1018 struct inet6_dev *idev;
b71d1d42 1019 const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr;
1da177e4
LT		 1020 struct ndisc_options ndopts;
1021 u8 *lladdr = NULL;
1022
1023 if (skb->len < sizeof(*rs_msg))
1024 return;
1025
cfdf7647 1026 idev = __in6_dev_get(skb->dev);
1da177e4
LT		 1027 if (!idev) {
1028 if (net_ratelimit())
1029 ND_PRINTK1("ICMP6 RS: can't find in6 device\n");
1030 return;
1031 }
1032
1033 /* Don't accept RS if we're not in router mode */
1034 if (!idev->cnf.forwarding)
1035 goto out;
1036
1037 /*
1038 * Don't update NCE if src = ::;
1039 * this implies that the source node has no ip address assigned yet.
1040 */
1041 if (ipv6_addr_any(saddr))
1042 goto out;
1043
1044 /* Parse ND options */
1045 if (!ndisc_parse_options(rs_msg->opt, ndoptlen, &ndopts)) {
1046 if (net_ratelimit())
1047 ND_PRINTK2("ICMP6 NS: invalid ND option, ignored\n");
1048 goto out;
1049 }
1050
1051 if (ndopts.nd_opts_src_lladdr) {
1052 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr,
1053 skb->dev);
1054 if (!lladdr)
1055 goto out;
1056 }
1057
1058 neigh = __neigh_lookup(&nd_tbl, saddr, skb->dev, 1);
1059 if (neigh) {
1060 neigh_update(neigh, lladdr, NUD_STALE,
1061 NEIGH_UPDATE_F_WEAK_OVERRIDE|
1062 NEIGH_UPDATE_F_OVERRIDE|
1063 NEIGH_UPDATE_F_OVERRIDE_ISROUTER);
1064 neigh_release(neigh);
1065 }
1066out:
cfdf7647 1067 return;
1da177e4
LT		 1068}
1069
31910575
PY		 1070static void ndisc_ra_useropt(struct sk_buff *ra, struct nd_opt_hdr *opt)
1071{
1072 struct icmp6hdr *icmp6h = (struct icmp6hdr *)skb_transport_header(ra);
1073 struct sk_buff *skb;
1074 struct nlmsghdr *nlh;
1075 struct nduseroptmsg *ndmsg;
c346dca1 1076 struct net *net = dev_net(ra->dev);
31910575
PY		 1077 int err;
1078 int base_size = NLMSG_ALIGN(sizeof(struct nduseroptmsg)
1079 + (opt->nd_opt_len << 3));
1080 size_t msg_size = base_size + nla_total_size(sizeof(struct in6_addr));
1081
1082 skb = nlmsg_new(msg_size, GFP_ATOMIC);
1083 if (skb == NULL) {
1084 err = -ENOBUFS;
1085 goto errout;
1086 }
1087
1088 nlh = nlmsg_put(skb, 0, 0, RTM_NEWNDUSEROPT, base_size, 0);
1089 if (nlh == NULL) {
1090 goto nla_put_failure;
1091 }
1092
1093 ndmsg = nlmsg_data(nlh);
1094 ndmsg->nduseropt_family = AF_INET6;
dbb2ed24 1095 ndmsg->nduseropt_ifindex = ra->dev->ifindex;
31910575
PY		 1096 ndmsg->nduseropt_icmp_type = icmp6h->icmp6_type;
1097 ndmsg->nduseropt_icmp_code = icmp6h->icmp6_code;
1098 ndmsg->nduseropt_opts_len = opt->nd_opt_len << 3;
1099
1100 memcpy(ndmsg + 1, opt, opt->nd_opt_len << 3);
1101
1102 NLA_PUT(skb, NDUSEROPT_SRCADDR, sizeof(struct in6_addr),
1103 &ipv6_hdr(ra)->saddr);
1104 nlmsg_end(skb, nlh);
1105
1ce85fe4 1106 rtnl_notify(skb, net, 0, RTNLGRP_ND_USEROPT, NULL, GFP_ATOMIC);
31910575
PY		 1107 return;
1108
1109nla_put_failure:
1110 nlmsg_free(skb);
1111 err = -EMSGSIZE;
1112errout:
a18bc695 1113 rtnl_set_sk_err(net, RTNLGRP_ND_USEROPT, err);
31910575
PY		 1114}
1115
65e9b62d
TG		 1116static inline int accept_ra(struct inet6_dev *in6_dev)
1117{
1118 /*
1119 * If forwarding is enabled, RA are not accepted unless the special
1120 * hybrid mode (accept_ra=2) is enabled.
1121 */
1122 if (in6_dev->cnf.forwarding && in6_dev->cnf.accept_ra < 2)
1123 return 0;
1124
1125 return in6_dev->cnf.accept_ra;
1126}
1127
1da177e4
LT		 1128static void ndisc_router_discovery(struct sk_buff *skb)
1129{
9c70220b 1130 struct ra_msg *ra_msg = (struct ra_msg *)skb_transport_header(skb);
1da177e4
LT		 1131 struct neighbour *neigh = NULL;
1132 struct inet6_dev *in6_dev;
65f5c7c1 1133 struct rt6_info *rt = NULL;
1da177e4
LT		 1134 int lifetime;
1135 struct ndisc_options ndopts;
1136 int optlen;
ebacaaa0 1137 unsigned int pref = 0;
1da177e4
LT		 1138
1139 __u8 * opt = (__u8 *)(ra_msg + 1);
1140
27a884dc 1141 optlen = (skb->tail - skb->transport_header) - sizeof(struct ra_msg);
1da177e4 1142
0660e03f 1143 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) {
1da177e4
LT		 1144 ND_PRINTK2(KERN_WARNING
1145 "ICMPv6 RA: source address is not link-local.\n");
1146 return;
1147 }
1148 if (optlen < 0) {
1ab1457c 1149 ND_PRINTK2(KERN_WARNING
1da177e4
LT		 1150 "ICMPv6 RA: packet too short\n");
1151 return;
1152 }
1153
de357cc0 1154#ifdef CONFIG_IPV6_NDISC_NODETYPE
fadf6bf0
TF		 1155 if (skb->ndisc_nodetype == NDISC_NODETYPE_HOST) {
1156 ND_PRINTK2(KERN_WARNING
1157 "ICMPv6 RA: from host or unauthorized router\n");
1158 return;
1159 }
de357cc0 1160#endif
fadf6bf0 1161
1da177e4
LT		 1162 /*
1163 * set the RA_RECV flag in the interface
1164 */
1165
cfdf7647 1166 in6_dev = __in6_dev_get(skb->dev);
1da177e4
LT		 1167 if (in6_dev == NULL) {
1168 ND_PRINTK0(KERN_ERR
1169 "ICMPv6 RA: can't find inet6 device for %s.\n",
1170 skb->dev->name);
1171 return;
1172 }
1da177e4
LT		 1173
1174 if (!ndisc_parse_options(opt, optlen, &ndopts)) {
1da177e4
LT		 1175 ND_PRINTK2(KERN_WARNING
1176 "ICMP6 RA: invalid ND options\n");
1177 return;
1178 }
1179
65e9b62d 1180 if (!accept_ra(in6_dev))
31ce8c71
DW		 1181 goto skip_linkparms;
1182
de357cc0 1183#ifdef CONFIG_IPV6_NDISC_NODETYPE
fadf6bf0
TF		 1184 /* skip link-specific parameters from interior routers */
1185 if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT)
1186 goto skip_linkparms;
de357cc0 1187#endif
fadf6bf0 1188
1da177e4
LT		 1189 if (in6_dev->if_flags & IF_RS_SENT) {
1190 /*
1191 * flag that an RA was received after an RS was sent
1192 * out on this interface.
1193 */
1194 in6_dev->if_flags |= IF_RA_RCVD;
1195 }
1196
1197 /*
1198 * Remember the managed/otherconf flags from most recently
1199 * received RA message (RFC 2462) -- yoshfuji
1200 */
1201 in6_dev->if_flags = (in6_dev->if_flags & ~(IF_RA_MANAGED |
1202 IF_RA_OTHERCONF)) |
1203 (ra_msg->icmph.icmp6_addrconf_managed ?
1204 IF_RA_MANAGED : 0) |
1205 (ra_msg->icmph.icmp6_addrconf_other ?
1206 IF_RA_OTHERCONF : 0);
1207
65f5c7c1
YH		 1208 if (!in6_dev->cnf.accept_ra_defrtr)
1209 goto skip_defrtr;
1210
9f56220f
AH		 1211 if (ipv6_chk_addr(dev_net(in6_dev->dev), &ipv6_hdr(skb)->saddr, NULL, 0))
1212 goto skip_defrtr;
1213
1da177e4
LT		 1214 lifetime = ntohs(ra_msg->icmph.icmp6_rt_lifetime);
1215
ebacaaa0
YH		 1216#ifdef CONFIG_IPV6_ROUTER_PREF
1217 pref = ra_msg->icmph.icmp6_router_pref;
1218 /* 10b is handled as if it were 00b (medium) */
930d6ff2 1219 if (pref == ICMPV6_ROUTER_PREF_INVALID ||
6d5b78cd 1220 !in6_dev->cnf.accept_ra_rtr_pref)
ebacaaa0
YH		 1221 pref = ICMPV6_ROUTER_PREF_MEDIUM;
1222#endif
1223
0660e03f 1224 rt = rt6_get_dflt_router(&ipv6_hdr(skb)->saddr, skb->dev);
1da177e4
LT		 1225
1226 if (rt)
27217455 1227 neigh = dst_get_neighbour_noref(&rt->dst);
1da177e4
LT		 1228
1229 if (rt && lifetime == 0) {
1230 neigh_clone(neigh);
e0a1ad73 1231 ip6_del_rt(rt);
1da177e4
LT		 1232 rt = NULL;
1233 }
1234
1235 if (rt == NULL && lifetime) {
1236 ND_PRINTK3(KERN_DEBUG
1237 "ICMPv6 RA: adding default router.\n");
1238
0660e03f 1239 rt = rt6_add_dflt_router(&ipv6_hdr(skb)->saddr, skb->dev, pref);
1da177e4
LT		 1240 if (rt == NULL) {
1241 ND_PRINTK0(KERN_ERR
1242 "ICMPv6 RA: %s() failed to add default route.\n",
0dc47877 1243 __func__);
1da177e4
LT		 1244 return;
1245 }
1246
27217455 1247 neigh = dst_get_neighbour_noref(&rt->dst);
1da177e4
LT		 1248 if (neigh == NULL) {
1249 ND_PRINTK0(KERN_ERR
1250 "ICMPv6 RA: %s() got default router without neighbour.\n",
0dc47877 1251 __func__);
d8d1f30b 1252 dst_release(&rt->dst);
1da177e4
LT		 1253 return;
1254 }
1255 neigh->flags |= NTF_ROUTER;
ebacaaa0 1256 } else if (rt) {
22441cfa 1257 rt->rt6i_flags = (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
1da177e4
LT		 1258 }
1259
1260 if (rt)
d1918542 1261 rt->dst.expires = jiffies + (HZ * lifetime);
1da177e4
LT		 1262
1263 if (ra_msg->icmph.icmp6_hop_limit) {
1264 in6_dev->cnf.hop_limit = ra_msg->icmph.icmp6_hop_limit;
1265 if (rt)
defb3519
DM		 1266 dst_metric_set(&rt->dst, RTAX_HOPLIMIT,
1267 ra_msg->icmph.icmp6_hop_limit);
1da177e4
LT		 1268 }
1269
65f5c7c1
YH		 1270skip_defrtr:
1271
1da177e4
LT		 1272 /*
1273 * Update Reachable Time and Retrans Timer
1274 */
1275
1276 if (in6_dev->nd_parms) {
1277 unsigned long rtime = ntohl(ra_msg->retrans_timer);
1278
1279 if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/HZ) {
1280 rtime = (rtime*HZ)/1000;
1281 if (rtime < HZ/10)
1282 rtime = HZ/10;
1283 in6_dev->nd_parms->retrans_time = rtime;
1284 in6_dev->tstamp = jiffies;
1285 inet6_ifinfo_notify(RTM_NEWLINK, in6_dev);
1286 }
1287
1288 rtime = ntohl(ra_msg->reachable_time);
1289 if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/(3*HZ)) {
1290 rtime = (rtime*HZ)/1000;
1291
1292 if (rtime < HZ/10)
1293 rtime = HZ/10;
1294
1295 if (rtime != in6_dev->nd_parms->base_reachable_time) {
1296 in6_dev->nd_parms->base_reachable_time = rtime;
1297 in6_dev->nd_parms->gc_staletime = 3 * rtime;
1298 in6_dev->nd_parms->reachable_time = neigh_rand_reach_time(rtime);
1299 in6_dev->tstamp = jiffies;
1300 inet6_ifinfo_notify(RTM_NEWLINK, in6_dev);
1301 }
1302 }
1303 }
1304
fadf6bf0
TF		 1305skip_linkparms:
1306
1da177e4
LT		 1307 /*
1308 * Process options.
1309 */
1310
1311 if (!neigh)
0660e03f 1312 neigh = __neigh_lookup(&nd_tbl, &ipv6_hdr(skb)->saddr,
1da177e4
LT		 1313 skb->dev, 1);
1314 if (neigh) {
1315 u8 *lladdr = NULL;
1316 if (ndopts.nd_opts_src_lladdr) {
1317 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr,
1318 skb->dev);
1319 if (!lladdr) {
1320 ND_PRINTK2(KERN_WARNING
1321 "ICMPv6 RA: invalid link-layer address length\n");
1322 goto out;
1323 }
1324 }
1325 neigh_update(neigh, lladdr, NUD_STALE,
1326 NEIGH_UPDATE_F_WEAK_OVERRIDE|
1327 NEIGH_UPDATE_F_OVERRIDE|
1328 NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
1329 NEIGH_UPDATE_F_ISROUTER);
1330 }
1331
65e9b62d 1332 if (!accept_ra(in6_dev))
31ce8c71
DW		 1333 goto out;
1334
70ceb4f5 1335#ifdef CONFIG_IPV6_ROUTE_INFO
9f56220f
AH		 1336 if (ipv6_chk_addr(dev_net(in6_dev->dev), &ipv6_hdr(skb)->saddr, NULL, 0))
1337 goto skip_routeinfo;
1338
09c884d4 1339 if (in6_dev->cnf.accept_ra_rtr_pref && ndopts.nd_opts_ri) {
70ceb4f5
YH		 1340 struct nd_opt_hdr *p;
1341 for (p = ndopts.nd_opts_ri;
1342 p;
1343 p = ndisc_next_option(p, ndopts.nd_opts_ri_end)) {
6294e000
YH		 1344 struct route_info *ri = (struct route_info *)p;
1345#ifdef CONFIG_IPV6_NDISC_NODETYPE
1346 if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT &&
1347 ri->prefix_len == 0)
1348 continue;
1349#endif
1350 if (ri->prefix_len > in6_dev->cnf.accept_ra_rt_info_max_plen)
09c884d4 1351 continue;
70ceb4f5 1352 rt6_route_rcv(skb->dev, (u8*)p, (p->nd_opt_len) << 3,
0660e03f 1353 &ipv6_hdr(skb)->saddr);
70ceb4f5
YH		 1354 }
1355 }
9f56220f
AH		 1356
1357skip_routeinfo:
70ceb4f5
YH		 1358#endif
1359
de357cc0 1360#ifdef CONFIG_IPV6_NDISC_NODETYPE
fadf6bf0
TF		 1361 /* skip link-specific ndopts from interior routers */
1362 if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT)
1363 goto out;
de357cc0 1364#endif
fadf6bf0 1365
c4fd30eb 1366 if (in6_dev->cnf.accept_ra_pinfo && ndopts.nd_opts_pi) {
1da177e4
LT		 1367 struct nd_opt_hdr *p;
1368 for (p = ndopts.nd_opts_pi;
1369 p;
1370 p = ndisc_next_option(p, ndopts.nd_opts_pi_end)) {
e6bff995
NH		 1371 addrconf_prefix_rcv(skb->dev, (u8 *)p,
1372 (p->nd_opt_len) << 3,
1373 ndopts.nd_opts_src_lladdr != NULL);
1da177e4
LT		 1374 }
1375 }
1376
1377 if (ndopts.nd_opts_mtu) {
e69a4adc 1378 __be32 n;
1da177e4
LT		 1379 u32 mtu;
1380
e69a4adc
AV		 1381 memcpy(&n, ((u8*)(ndopts.nd_opts_mtu+1))+2, sizeof(mtu));
1382 mtu = ntohl(n);
1da177e4
LT		 1383
1384 if (mtu < IPV6_MIN_MTU || mtu > skb->dev->mtu) {
1385 ND_PRINTK2(KERN_WARNING
1386 "ICMPv6 RA: invalid mtu: %d\n",
1387 mtu);
1388 } else if (in6_dev->cnf.mtu6 != mtu) {
1389 in6_dev->cnf.mtu6 = mtu;
1390
1391 if (rt)
defb3519 1392 dst_metric_set(&rt->dst, RTAX_MTU, mtu);
1da177e4
LT		 1393
1394 rt6_mtu_change(skb->dev, mtu);
1395 }
1396 }
1ab1457c 1397
31910575 1398 if (ndopts.nd_useropts) {
61cf46ad
YH		 1399 struct nd_opt_hdr *p;
1400 for (p = ndopts.nd_useropts;
1401 p;
1402 p = ndisc_next_useropt(p, ndopts.nd_useropts_end)) {
1403 ndisc_ra_useropt(skb, p);
31910575
PY		 1404 }
1405 }
1406
1da177e4
LT		 1407 if (ndopts.nd_opts_tgt_lladdr || ndopts.nd_opts_rh) {
1408 ND_PRINTK2(KERN_WARNING
1409 "ICMPv6 RA: invalid RA options");
1410 }
1411out:
1412 if (rt)
d8d1f30b 1413 dst_release(&rt->dst);
1da177e4
LT		 1414 else if (neigh)
1415 neigh_release(neigh);
1da177e4
LT		 1416}
1417
1418static void ndisc_redirect_rcv(struct sk_buff *skb)
1419{
1420 struct inet6_dev *in6_dev;
1421 struct icmp6hdr *icmph;
b71d1d42
ED		 1422 const struct in6_addr *dest;
1423 const struct in6_addr *target; /* new first hop to destination */
1da177e4
LT		 1424 struct neighbour *neigh;
1425 int on_link = 0;
1426 struct ndisc_options ndopts;
1427 int optlen;
1428 u8 *lladdr = NULL;
1429
de357cc0 1430#ifdef CONFIG_IPV6_NDISC_NODETYPE
fadf6bf0
TF		 1431 switch (skb->ndisc_nodetype) {
1432 case NDISC_NODETYPE_HOST:
1433 case NDISC_NODETYPE_NODEFAULT:
1434 ND_PRINTK2(KERN_WARNING
1435 "ICMPv6 Redirect: from host or unauthorized router\n");
1436 return;
1437 }
de357cc0 1438#endif
fadf6bf0 1439
0660e03f 1440 if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) {
1da177e4
LT		 1441 ND_PRINTK2(KERN_WARNING
1442 "ICMPv6 Redirect: source address is not link-local.\n");
1443 return;
1444 }
1445
27a884dc 1446 optlen = skb->tail - skb->transport_header;
1da177e4
LT		 1447 optlen -= sizeof(struct icmp6hdr) + 2 * sizeof(struct in6_addr);
1448
1449 if (optlen < 0) {
1450 ND_PRINTK2(KERN_WARNING
1451 "ICMPv6 Redirect: packet too short\n");
1452 return;
1453 }
1454
cc70ab26 1455 icmph = icmp6_hdr(skb);
b71d1d42 1456 target = (const struct in6_addr *) (icmph + 1);
1da177e4
LT		 1457 dest = target + 1;
1458
1459 if (ipv6_addr_is_multicast(dest)) {
1460 ND_PRINTK2(KERN_WARNING
1461 "ICMPv6 Redirect: destination address is multicast.\n");
1462 return;
1463 }
1464
1465 if (ipv6_addr_equal(dest, target)) {
1466 on_link = 1;
bf0b48df
BH		 1467 } else if (ipv6_addr_type(target) !=
1468 (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
1ab1457c 1469 ND_PRINTK2(KERN_WARNING
bf0b48df 1470 "ICMPv6 Redirect: target address is not link-local unicast.\n");
1da177e4
LT		 1471 return;
1472 }
1473
cfdf7647 1474 in6_dev = __in6_dev_get(skb->dev);
1da177e4
LT		 1475 if (!in6_dev)
1476 return;
cfdf7647 1477 if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects)
1da177e4 1478 return;
1da177e4 1479
1ab1457c 1480 /* RFC2461 8.1:
1da177e4
LT		 1481 * The IP source address of the Redirect MUST be the same as the current
1482 * first-hop router for the specified ICMP Destination Address.
1483 */
1ab1457c 1484
1da177e4
LT		 1485 if (!ndisc_parse_options((u8*)(dest + 1), optlen, &ndopts)) {
1486 ND_PRINTK2(KERN_WARNING
1487 "ICMPv6 Redirect: invalid ND options\n");
1da177e4
LT		 1488 return;
1489 }
1490 if (ndopts.nd_opts_tgt_lladdr) {
1491 lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr,
1492 skb->dev);
1493 if (!lladdr) {
1494 ND_PRINTK2(KERN_WARNING
1495 "ICMPv6 Redirect: invalid link-layer address length\n");
1da177e4
LT		 1496 return;
1497 }
1498 }
1499
1500 neigh = __neigh_lookup(&nd_tbl, target, skb->dev, 1);
1501 if (neigh) {
0660e03f
ACM		 1502 rt6_redirect(dest, &ipv6_hdr(skb)->daddr,
1503 &ipv6_hdr(skb)->saddr, neigh, lladdr,
1da177e4
LT		 1504 on_link);
1505 neigh_release(neigh);
1506 }
1da177e4
LT		 1507}
1508
1509void ndisc_send_redirect(struct sk_buff *skb, struct neighbour *neigh,
9acd9f3a 1510 const struct in6_addr *target)
1da177e4 1511{
1762f7e8 1512 struct net_device *dev = skb->dev;
c346dca1 1513 struct net *net = dev_net(dev);
1762f7e8 1514 struct sock *sk = net->ipv6.ndisc_sk;
1da177e4
LT		 1515 int len = sizeof(struct icmp6hdr) + 2 * sizeof(struct in6_addr);
1516 struct sk_buff *buff;
1517 struct icmp6hdr *icmph;
1518 struct in6_addr saddr_buf;
1519 struct in6_addr *addrp;
1da177e4
LT		 1520 struct rt6_info *rt;
1521 struct dst_entry *dst;
1522 struct inet6_dev *idev;
4c9483b2 1523 struct flowi6 fl6;
1da177e4 1524 u8 *opt;
a7ae1992 1525 int hlen, tlen;
1da177e4
LT		 1526 int rd_len;
1527 int err;
1da177e4
LT		 1528 u8 ha_buf[MAX_ADDR_LEN], *ha = NULL;
1529
95c385b4 1530 if (ipv6_get_lladdr(dev, &saddr_buf, IFA_F_TENTATIVE)) {
1da177e4
LT		 1531 ND_PRINTK2(KERN_WARNING
1532 "ICMPv6 Redirect: no link-local address on %s\n",
1533 dev->name);
1ab1457c
YH		 1534 return;
1535 }
1da177e4 1536
0660e03f 1537 if (!ipv6_addr_equal(&ipv6_hdr(skb)->daddr, target) &&
bf0b48df 1538 ipv6_addr_type(target) != (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
29556526 1539 ND_PRINTK2(KERN_WARNING
bf0b48df 1540 "ICMPv6 Redirect: target address is not link-local unicast.\n");
29556526
LY		 1541 return;
1542 }
1543
4c9483b2 1544 icmpv6_flow_init(sk, &fl6, NDISC_REDIRECT,
95e41e93 1545 &saddr_buf, &ipv6_hdr(skb)->saddr, dev->ifindex);
1da177e4 1546
4c9483b2 1547 dst = ip6_route_output(net, NULL, &fl6);
1da177e4
LT		 1548 if (dst == NULL)
1549 return;
1550
4c9483b2 1551 dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), NULL, 0);
452edd59 1552 if (IS_ERR(dst))
1da177e4 1553 return;
1da177e4
LT		 1554
1555 rt = (struct rt6_info *) dst;
1556
1557 if (rt->rt6i_flags & RTF_GATEWAY) {
1558 ND_PRINTK2(KERN_WARNING
1559 "ICMPv6 Redirect: destination is not a neighbour.\n");
d73f0801 1560 goto release;
1da177e4 1561 }
92d86829
DM		 1562 if (!rt->rt6i_peer)
1563 rt6_bind_peer(rt, 1);
4d65a246 1564 if (!inet_peer_xrlim_allow(rt->rt6i_peer, 1*HZ))
d73f0801 1565 goto release;
1da177e4
LT		 1566
1567 if (dev->addr_len) {
1568 read_lock_bh(&neigh->lock);
1569 if (neigh->nud_state & NUD_VALID) {
1570 memcpy(ha_buf, neigh->ha, dev->addr_len);
1571 read_unlock_bh(&neigh->lock);
1572 ha = ha_buf;
1573 len += ndisc_opt_addr_space(dev);
1574 } else
1575 read_unlock_bh(&neigh->lock);
1576 }
1577
1578 rd_len = min_t(unsigned int,
1579 IPV6_MIN_MTU-sizeof(struct ipv6hdr)-len, skb->len + 8);
1580 rd_len &= ~0x7;
1581 len += rd_len;
1582
a7ae1992
HX		 1583 hlen = LL_RESERVED_SPACE(dev);
1584 tlen = dev->needed_tailroom;
d54a81d3
DM		 1585 buff = sock_alloc_send_skb(sk,
1586 (MAX_HEADER + sizeof(struct ipv6hdr) +
a7ae1992 1587 len + hlen + tlen),
1da177e4
LT		 1588 1, &err);
1589 if (buff == NULL) {
1590 ND_PRINTK0(KERN_ERR
dae9de8e
BH		 1591 "ICMPv6 Redirect: %s() failed to allocate an skb, err=%d.\n",
1592 __func__, err);
d73f0801 1593 goto release;
1da177e4
LT		 1594 }
1595
a7ae1992 1596 skb_reserve(buff, hlen);
0660e03f 1597 ip6_nd_hdr(sk, buff, dev, &saddr_buf, &ipv6_hdr(skb)->saddr,
1da177e4
LT		 1598 IPPROTO_ICMPV6, len);
1599
27a884dc 1600 skb_set_transport_header(buff, skb_tail_pointer(buff) - buff->data);
d10ba34b
ACM		 1601 skb_put(buff, len);
1602 icmph = icmp6_hdr(buff);
1da177e4
LT		 1603
1604 memset(icmph, 0, sizeof(struct icmp6hdr));
1605 icmph->icmp6_type = NDISC_REDIRECT;
1606
1607 /*
1608 * copy target and destination addresses
1609 */
1610
1611 addrp = (struct in6_addr *)(icmph + 1);
4e3fd7a0 1612 *addrp = *target;
1da177e4 1613 addrp++;
4e3fd7a0 1614 *addrp = ipv6_hdr(skb)->daddr;
1da177e4
LT		 1615
1616 opt = (u8*) (addrp + 1);
1617
1618 /*
1619 * include target_address option
1620 */
1621
1622 if (ha)
1623 opt = ndisc_fill_addr_option(opt, ND_OPT_TARGET_LL_ADDR, ha,
1624 dev->addr_len, dev->type);
1625
1626 /*
1627 * build redirect option and copy skb over to the new packet.
1628 */
1629
1ab1457c 1630 memset(opt, 0, 8);
1da177e4
LT		 1631 *(opt++) = ND_OPT_REDIRECT_HDR;
1632 *(opt++) = (rd_len >> 3);
1633 opt += 6;
1634
0660e03f 1635 memcpy(opt, ipv6_hdr(skb), rd_len - 8);
1da177e4 1636
0660e03f 1637 icmph->icmp6_cksum = csum_ipv6_magic(&saddr_buf, &ipv6_hdr(skb)->saddr,
1da177e4 1638 len, IPPROTO_ICMPV6,
07f0757a 1639 csum_partial(icmph, len, 0));
1da177e4 1640
adf30907 1641 skb_dst_set(buff, dst);
cfdf7647
ED		 1642 rcu_read_lock();
1643 idev = __in6_dev_get(dst->dev);
edf391ff 1644 IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
b2e0b385 1645 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, buff, NULL, dst->dev,
6e23ae2a 1646 dst_output);
1da177e4 1647 if (!err) {
5c5d244b 1648 ICMP6MSGOUT_INC_STATS(net, idev, NDISC_REDIRECT);
a862f6a6 1649 ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1da177e4
LT		 1650 }
1651
cfdf7647 1652 rcu_read_unlock();
d73f0801
IJ		 1653 return;
1654
1655release:
1656 dst_release(dst);
1da177e4
LT		 1657}
1658
1659static void pndisc_redo(struct sk_buff *skb)
1660{
140e26fc 1661 ndisc_recv_ns(skb);
1da177e4
LT		 1662 kfree_skb(skb);
1663}
1664
1665int ndisc_rcv(struct sk_buff *skb)
1666{
1667 struct nd_msg *msg;
1668
1669 if (!pskb_may_pull(skb, skb->len))
1670 return 0;
1671
9c70220b 1672 msg = (struct nd_msg *)skb_transport_header(skb);
1da177e4 1673
9c70220b 1674 __skb_push(skb, skb->data - skb_transport_header(skb));
1da177e4 1675
0660e03f 1676 if (ipv6_hdr(skb)->hop_limit != 255) {
1da177e4
LT		 1677 ND_PRINTK2(KERN_WARNING
1678 "ICMPv6 NDISC: invalid hop-limit: %d\n",
0660e03f 1679 ipv6_hdr(skb)->hop_limit);
1da177e4
LT		 1680 return 0;
1681 }
1682
1683 if (msg->icmph.icmp6_code != 0) {
1ab1457c 1684 ND_PRINTK2(KERN_WARNING
1da177e4
LT		 1685 "ICMPv6 NDISC: invalid ICMPv6 code: %d\n",
1686 msg->icmph.icmp6_code);
1687 return 0;
1688 }
1689
a61bbcf2
PM		 1690 memset(NEIGH_CB(skb), 0, sizeof(struct neighbour_cb));
1691
1da177e4
LT		 1692 switch (msg->icmph.icmp6_type) {
1693 case NDISC_NEIGHBOUR_SOLICITATION:
1694 ndisc_recv_ns(skb);
1695 break;
1696
1697 case NDISC_NEIGHBOUR_ADVERTISEMENT:
1698 ndisc_recv_na(skb);
1699 break;
1700
1701 case NDISC_ROUTER_SOLICITATION:
1702 ndisc_recv_rs(skb);
1703 break;
1704
1705 case NDISC_ROUTER_ADVERTISEMENT:
1706 ndisc_router_discovery(skb);
1707 break;
1708
1709 case NDISC_REDIRECT:
1710 ndisc_redirect_rcv(skb);
1711 break;
3ff50b79 1712 }
1da177e4
LT		 1713
1714 return 0;
1715}
1716
1717static int ndisc_netdev_event(struct notifier_block *this, unsigned long event, void *ptr)
1718{
1719 struct net_device *dev = ptr;
c346dca1 1720 struct net *net = dev_net(dev);
1da177e4
LT		 1721
1722 switch (event) {
1723 case NETDEV_CHANGEADDR:
1724 neigh_changeaddr(&nd_tbl, dev);
5b7c931d 1725 fib6_run_gc(~0UL, net);
1da177e4
LT		 1726 break;
1727 case NETDEV_DOWN:
1728 neigh_ifdown(&nd_tbl, dev);
5b7c931d 1729 fib6_run_gc(~0UL, net);
1da177e4 1730 break;
f47b9464
BH		 1731 case NETDEV_NOTIFY_PEERS:
1732 ndisc_send_unsol_na(dev);
1733 break;
1da177e4
LT		 1734 default:
1735 break;
1736 }
1737
1738 return NOTIFY_DONE;
1739}
1740
1741static struct notifier_block ndisc_netdev_notifier = {
1742 .notifier_call = ndisc_netdev_event,
1743};
1744
1745#ifdef CONFIG_SYSCTL
1746static void ndisc_warn_deprecated_sysctl(struct ctl_table *ctl,
1747 const char *func, const char *dev_name)
1748{
1749 static char warncomm[TASK_COMM_LEN];
1750 static int warned;
1751 if (strcmp(warncomm, current->comm) && warned < 5) {
1752 strcpy(warncomm, current->comm);
1753 printk(KERN_WARNING
1754 "process `%s' is using deprecated sysctl (%s) "
1755 "net.ipv6.neigh.%s.%s; "
1756 "Use net.ipv6.neigh.%s.%s_ms "
1757 "instead.\n",
1758 warncomm, func,
1759 dev_name, ctl->procname,
1760 dev_name, ctl->procname);
1761 warned++;
1762 }
1763}
1764
8d65af78 1765int ndisc_ifinfo_sysctl_change(struct ctl_table *ctl, int write, void __user *buffer, size_t *lenp, loff_t *ppos)
1da177e4
LT		 1766{
1767 struct net_device *dev = ctl->extra1;
1768 struct inet6_dev *idev;
1769 int ret;
1770
d12af679
EB		 1771 if ((strcmp(ctl->procname, "retrans_time") == 0) ||
1772 (strcmp(ctl->procname, "base_reachable_time") == 0))
1da177e4
LT		 1773 ndisc_warn_deprecated_sysctl(ctl, "syscall", dev ? dev->name : "default");
1774
d12af679 1775 if (strcmp(ctl->procname, "retrans_time") == 0)
8d65af78 1776 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
d12af679
EB		 1777
1778 else if (strcmp(ctl->procname, "base_reachable_time") == 0)
1da177e4 1779 ret = proc_dointvec_jiffies(ctl, write,
8d65af78 1780 buffer, lenp, ppos);
d12af679
EB		 1781
1782 else if ((strcmp(ctl->procname, "retrans_time_ms") == 0) ||
ad02ac14 1783 (strcmp(ctl->procname, "base_reachable_time_ms") == 0))
1da177e4 1784 ret = proc_dointvec_ms_jiffies(ctl, write,
8d65af78 1785 buffer, lenp, ppos);
d12af679 1786 else
1da177e4 1787 ret = -1;
1da177e4
LT		 1788
1789 if (write && ret == 0 && dev && (idev = in6_dev_get(dev)) != NULL) {
d12af679 1790 if (ctl->data == &idev->nd_parms->base_reachable_time)
1da177e4
LT		 1791 idev->nd_parms->reachable_time = neigh_rand_reach_time(idev->nd_parms->base_reachable_time);
1792 idev->tstamp = jiffies;
1793 inet6_ifinfo_notify(RTM_NEWLINK, idev);
1794 in6_dev_put(idev);
1795 }
1796 return ret;
1797}
1798
1da177e4
LT		 1799
1800#endif
1801
2c8c1e72 1802static int __net_init ndisc_net_init(struct net *net)
1da177e4
LT		 1803{
1804 struct ipv6_pinfo *np;
1805 struct sock *sk;
1ab1457c 1806 int err;
1da177e4 1807
1ed8516f
DL		 1808 err = inet_ctl_sock_create(&sk, PF_INET6,
1809 SOCK_RAW, IPPROTO_ICMPV6, net);
1da177e4
LT		 1810 if (err < 0) {
1811 ND_PRINTK0(KERN_ERR
1ab1457c 1812 "ICMPv6 NDISC: Failed to initialize the control socket (err %d).\n",
1da177e4 1813 err);
1da177e4
LT		 1814 return err;
1815 }
1816
1ed8516f 1817 net->ipv6.ndisc_sk = sk;
1762f7e8 1818
1da177e4 1819 np = inet6_sk(sk);
1da177e4
LT		 1820 np->hop_limit = 255;
1821 /* Do not loopback ndisc messages */
1822 np->mc_loop = 0;
1da177e4 1823
1762f7e8
DL		 1824 return 0;
1825}
1826
2c8c1e72 1827static void __net_exit ndisc_net_exit(struct net *net)
1762f7e8 1828{
1ed8516f 1829 inet_ctl_sock_destroy(net->ipv6.ndisc_sk);
1762f7e8
DL		 1830}
1831
1832static struct pernet_operations ndisc_net_ops = {
1833 .init = ndisc_net_init,
1834 .exit = ndisc_net_exit,
1835};
1836
1837int __init ndisc_init(void)
1838{
1839 int err;
1840
1841 err = register_pernet_subsys(&ndisc_net_ops);
1842 if (err)
1843 return err;
1ab1457c
YH		 1844 /*
1845 * Initialize the neighbour table
1846 */
1da177e4
LT		 1847 neigh_table_init(&nd_tbl);
1848
1849#ifdef CONFIG_SYSCTL
54716e3b 1850 err = neigh_sysctl_register(NULL, &nd_tbl.parms, "ipv6",
f8572d8f 1851 &ndisc_ifinfo_sysctl_change);
1762f7e8
DL		 1852 if (err)
1853 goto out_unregister_pernet;
1da177e4 1854#endif
1762f7e8
DL		 1855 err = register_netdevice_notifier(&ndisc_netdev_notifier);
1856 if (err)
1857 goto out_unregister_sysctl;
1858out:
1859 return err;
1da177e4 1860
1762f7e8
DL		 1861out_unregister_sysctl:
1862#ifdef CONFIG_SYSCTL
1863 neigh_sysctl_unregister(&nd_tbl.parms);
1864out_unregister_pernet:
1865#endif
1866 unregister_pernet_subsys(&ndisc_net_ops);
1867 goto out;
1da177e4
LT		 1868}
1869
1870void ndisc_cleanup(void)
1871{
36f73d0c 1872 unregister_netdevice_notifier(&ndisc_netdev_notifier);
1da177e4
LT		 1873#ifdef CONFIG_SYSCTL
1874 neigh_sysctl_unregister(&nd_tbl.parms);
1875#endif
1876 neigh_table_clear(&nd_tbl);
1762f7e8 1877 unregister_pernet_subsys(&ndisc_net_ops);
1da177e4 1878}
kernel source for telekom puls (alcatel/mediatek)