Commit | Line | Data |
---|---|---|
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 | * | |
e35f30c1 | 18 | * Alexey I. Froloff : RFC6106 (DNSSL) support |
31910575 PY |
19 | * Pierre Ynard : export userland ND options |
20 | * through netlink (RDNSS support) | |
1da177e4 LT |
21 | * Lars Fenneberg : fixed MTU setting on receipt |
22 | * of an RA. | |
1da177e4 LT |
23 | * Janos Farkas : kmalloc failure checks |
24 | * Alexey Kuznetsov : state machine reworked | |
25 | * and moved to net/core. | |
26 | * Pekka Savola : RFC2461 validation | |
27 | * YOSHIFUJI Hideaki @USAGI : Verify ND options properly | |
28 | */ | |
29 | ||
30 | /* Set to 3 to get tracing... */ | |
31 | #define ND_DEBUG 1 | |
32 | ||
33 | #define ND_PRINTK(fmt, args...) do { if (net_ratelimit()) { printk(fmt, ## args); } } while(0) | |
34 | #define ND_NOPRINTK(x...) do { ; } while(0) | |
35 | #define ND_PRINTK0 ND_PRINTK | |
36 | #define ND_PRINTK1 ND_NOPRINTK | |
37 | #define ND_PRINTK2 ND_NOPRINTK | |
38 | #define ND_PRINTK3 ND_NOPRINTK | |
39 | #if ND_DEBUG >= 1 | |
40 | #undef ND_PRINTK1 | |
41 | #define ND_PRINTK1 ND_PRINTK | |
42 | #endif | |
43 | #if ND_DEBUG >= 2 | |
44 | #undef ND_PRINTK2 | |
45 | #define ND_PRINTK2 ND_PRINTK | |
46 | #endif | |
47 | #if ND_DEBUG >= 3 | |
48 | #undef ND_PRINTK3 | |
49 | #define ND_PRINTK3 ND_PRINTK | |
50 | #endif | |
51 | ||
52 | #include <linux/module.h> | |
1da177e4 LT |
53 | #include <linux/errno.h> |
54 | #include <linux/types.h> | |
55 | #include <linux/socket.h> | |
56 | #include <linux/sockios.h> | |
57 | #include <linux/sched.h> | |
58 | #include <linux/net.h> | |
59 | #include <linux/in6.h> | |
60 | #include <linux/route.h> | |
61 | #include <linux/init.h> | |
62 | #include <linux/rcupdate.h> | |
5a0e3ad6 | 63 | #include <linux/slab.h> |
1da177e4 LT |
64 | #ifdef CONFIG_SYSCTL |
65 | #include <linux/sysctl.h> | |
66 | #endif | |
67 | ||
1823730f | 68 | #include <linux/if_addr.h> |
1da177e4 LT |
69 | #include <linux/if_arp.h> |
70 | #include <linux/ipv6.h> | |
71 | #include <linux/icmpv6.h> | |
72 | #include <linux/jhash.h> | |
73 | ||
74 | #include <net/sock.h> | |
75 | #include <net/snmp.h> | |
76 | ||
77 | #include <net/ipv6.h> | |
78 | #include <net/protocol.h> | |
79 | #include <net/ndisc.h> | |
80 | #include <net/ip6_route.h> | |
81 | #include <net/addrconf.h> | |
82 | #include <net/icmp.h> | |
83 | ||
31910575 PY |
84 | #include <net/netlink.h> |
85 | #include <linux/rtnetlink.h> | |
86 | ||
1da177e4 LT |
87 | #include <net/flow.h> |
88 | #include <net/ip6_checksum.h> | |
1ed8516f | 89 | #include <net/inet_common.h> |
1da177e4 LT |
90 | #include <linux/proc_fs.h> |
91 | ||
92 | #include <linux/netfilter.h> | |
93 | #include <linux/netfilter_ipv6.h> | |
94 | ||
d6bf7817 ED |
95 | static u32 ndisc_hash(const void *pkey, |
96 | const struct net_device *dev, | |
2c2aba6c | 97 | __u32 *hash_rnd); |
1da177e4 LT |
98 | static int ndisc_constructor(struct neighbour *neigh); |
99 | static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb); | |
100 | static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb); | |
101 | static int pndisc_constructor(struct pneigh_entry *n); | |
102 | static void pndisc_destructor(struct pneigh_entry *n); | |
103 | static void pndisc_redo(struct sk_buff *skb); | |
104 | ||
89d69d2b | 105 | static const struct neigh_ops ndisc_generic_ops = { |
1da177e4 LT |
106 | .family = AF_INET6, |
107 | .solicit = ndisc_solicit, | |
108 | .error_report = ndisc_error_report, | |
109 | .output = neigh_resolve_output, | |
110 | .connected_output = neigh_connected_output, | |
1da177e4 LT |
111 | }; |
112 | ||
89d69d2b | 113 | static const struct neigh_ops ndisc_hh_ops = { |
1da177e4 LT |
114 | .family = AF_INET6, |
115 | .solicit = ndisc_solicit, | |
116 | .error_report = ndisc_error_report, | |
117 | .output = neigh_resolve_output, | |
118 | .connected_output = neigh_resolve_output, | |
1da177e4 LT |
119 | }; |
120 | ||
121 | ||
89d69d2b | 122 | static const struct neigh_ops ndisc_direct_ops = { |
1da177e4 | 123 | .family = AF_INET6, |
8f40b161 DM |
124 | .output = neigh_direct_output, |
125 | .connected_output = neigh_direct_output, | |
1da177e4 LT |
126 | }; |
127 | ||
128 | struct neigh_table nd_tbl = { | |
129 | .family = AF_INET6, | |
1da177e4 LT |
130 | .key_len = sizeof(struct in6_addr), |
131 | .hash = ndisc_hash, | |
132 | .constructor = ndisc_constructor, | |
133 | .pconstructor = pndisc_constructor, | |
134 | .pdestructor = pndisc_destructor, | |
135 | .proxy_redo = pndisc_redo, | |
136 | .id = "ndisc_cache", | |
137 | .parms = { | |
b672083e SW |
138 | .tbl = &nd_tbl, |
139 | .base_reachable_time = ND_REACHABLE_TIME, | |
140 | .retrans_time = ND_RETRANS_TIMER, | |
141 | .gc_staletime = 60 * HZ, | |
142 | .reachable_time = ND_REACHABLE_TIME, | |
143 | .delay_probe_time = 5 * HZ, | |
8b5c171b | 144 | .queue_len_bytes = 64*1024, |
b672083e SW |
145 | .ucast_probes = 3, |
146 | .mcast_probes = 3, | |
147 | .anycast_delay = 1 * HZ, | |
148 | .proxy_delay = (8 * HZ) / 10, | |
149 | .proxy_qlen = 64, | |
1da177e4 LT |
150 | }, |
151 | .gc_interval = 30 * HZ, | |
152 | .gc_thresh1 = 128, | |
153 | .gc_thresh2 = 512, | |
154 | .gc_thresh3 = 1024, | |
155 | }; | |
156 | ||
157 | /* ND options */ | |
158 | struct ndisc_options { | |
70ceb4f5 YH |
159 | struct nd_opt_hdr *nd_opt_array[__ND_OPT_ARRAY_MAX]; |
160 | #ifdef CONFIG_IPV6_ROUTE_INFO | |
161 | struct nd_opt_hdr *nd_opts_ri; | |
162 | struct nd_opt_hdr *nd_opts_ri_end; | |
163 | #endif | |
31910575 PY |
164 | struct nd_opt_hdr *nd_useropts; |
165 | struct nd_opt_hdr *nd_useropts_end; | |
1da177e4 LT |
166 | }; |
167 | ||
168 | #define nd_opts_src_lladdr nd_opt_array[ND_OPT_SOURCE_LL_ADDR] | |
169 | #define nd_opts_tgt_lladdr nd_opt_array[ND_OPT_TARGET_LL_ADDR] | |
170 | #define nd_opts_pi nd_opt_array[ND_OPT_PREFIX_INFO] | |
171 | #define nd_opts_pi_end nd_opt_array[__ND_OPT_PREFIX_INFO_END] | |
172 | #define nd_opts_rh nd_opt_array[ND_OPT_REDIRECT_HDR] | |
173 | #define nd_opts_mtu nd_opt_array[ND_OPT_MTU] | |
174 | ||
175 | #define NDISC_OPT_SPACE(len) (((len)+2+7)&~7) | |
176 | ||
177 | /* | |
178 | * Return the padding between the option length and the start of the | |
179 | * link addr. Currently only IP-over-InfiniBand needs this, although | |
180 | * if RFC 3831 IPv6-over-Fibre Channel is ever implemented it may | |
181 | * also need a pad of 2. | |
182 | */ | |
183 | static int ndisc_addr_option_pad(unsigned short type) | |
184 | { | |
185 | switch (type) { | |
186 | case ARPHRD_INFINIBAND: return 2; | |
187 | default: return 0; | |
188 | } | |
189 | } | |
190 | ||
191 | static inline int ndisc_opt_addr_space(struct net_device *dev) | |
192 | { | |
193 | return NDISC_OPT_SPACE(dev->addr_len + ndisc_addr_option_pad(dev->type)); | |
194 | } | |
195 | ||
196 | static u8 *ndisc_fill_addr_option(u8 *opt, int type, void *data, int data_len, | |
197 | unsigned short addr_type) | |
198 | { | |
199 | int space = NDISC_OPT_SPACE(data_len); | |
200 | int pad = ndisc_addr_option_pad(addr_type); | |
201 | ||
202 | opt[0] = type; | |
203 | opt[1] = space>>3; | |
204 | ||
205 | memset(opt + 2, 0, pad); | |
206 | opt += pad; | |
207 | space -= pad; | |
208 | ||
209 | memcpy(opt+2, data, data_len); | |
210 | data_len += 2; | |
211 | opt += data_len; | |
212 | if ((space -= data_len) > 0) | |
213 | memset(opt, 0, space); | |
214 | return opt + space; | |
215 | } | |
216 | ||
217 | static struct nd_opt_hdr *ndisc_next_option(struct nd_opt_hdr *cur, | |
218 | struct nd_opt_hdr *end) | |
219 | { | |
220 | int type; | |
221 | if (!cur || !end || cur >= end) | |
222 | return NULL; | |
223 | type = cur->nd_opt_type; | |
224 | do { | |
225 | cur = ((void *)cur) + (cur->nd_opt_len << 3); | |
226 | } while(cur < end && cur->nd_opt_type != type); | |
a02cec21 | 227 | return cur <= end && cur->nd_opt_type == type ? cur : NULL; |
1da177e4 LT |
228 | } |
229 | ||
31910575 PY |
230 | static inline int ndisc_is_useropt(struct nd_opt_hdr *opt) |
231 | { | |
e35f30c1 AF |
232 | return opt->nd_opt_type == ND_OPT_RDNSS || |
233 | opt->nd_opt_type == ND_OPT_DNSSL; | |
31910575 PY |
234 | } |
235 | ||
236 | static struct nd_opt_hdr *ndisc_next_useropt(struct nd_opt_hdr *cur, | |
237 | struct nd_opt_hdr *end) | |
238 | { | |
239 | if (!cur || !end || cur >= end) | |
240 | return NULL; | |
241 | do { | |
242 | cur = ((void *)cur) + (cur->nd_opt_len << 3); | |
243 | } while(cur < end && !ndisc_is_useropt(cur)); | |
a02cec21 | 244 | return cur <= end && ndisc_is_useropt(cur) ? cur : NULL; |
31910575 PY |
245 | } |
246 | ||
1da177e4 LT |
247 | static struct ndisc_options *ndisc_parse_options(u8 *opt, int opt_len, |
248 | struct ndisc_options *ndopts) | |
249 | { | |
250 | struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)opt; | |
251 | ||
252 | if (!nd_opt || opt_len < 0 || !ndopts) | |
253 | return NULL; | |
254 | memset(ndopts, 0, sizeof(*ndopts)); | |
255 | while (opt_len) { | |
256 | int l; | |
257 | if (opt_len < sizeof(struct nd_opt_hdr)) | |
258 | return NULL; | |
259 | l = nd_opt->nd_opt_len << 3; | |
260 | if (opt_len < l || l == 0) | |
261 | return NULL; | |
262 | switch (nd_opt->nd_opt_type) { | |
263 | case ND_OPT_SOURCE_LL_ADDR: | |
264 | case ND_OPT_TARGET_LL_ADDR: | |
265 | case ND_OPT_MTU: | |
266 | case ND_OPT_REDIRECT_HDR: | |
267 | if (ndopts->nd_opt_array[nd_opt->nd_opt_type]) { | |
268 | ND_PRINTK2(KERN_WARNING | |
269 | "%s(): duplicated ND6 option found: type=%d\n", | |
0dc47877 | 270 | __func__, |
1da177e4 LT |
271 | nd_opt->nd_opt_type); |
272 | } else { | |
273 | ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt; | |
274 | } | |
275 | break; | |
276 | case ND_OPT_PREFIX_INFO: | |
277 | ndopts->nd_opts_pi_end = nd_opt; | |
cfcabdcc | 278 | if (!ndopts->nd_opt_array[nd_opt->nd_opt_type]) |
1da177e4 LT |
279 | ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt; |
280 | break; | |
70ceb4f5 YH |
281 | #ifdef CONFIG_IPV6_ROUTE_INFO |
282 | case ND_OPT_ROUTE_INFO: | |
283 | ndopts->nd_opts_ri_end = nd_opt; | |
284 | if (!ndopts->nd_opts_ri) | |
285 | ndopts->nd_opts_ri = nd_opt; | |
286 | break; | |
287 | #endif | |
1da177e4 | 288 | default: |
31910575 PY |
289 | if (ndisc_is_useropt(nd_opt)) { |
290 | ndopts->nd_useropts_end = nd_opt; | |
291 | if (!ndopts->nd_useropts) | |
292 | ndopts->nd_useropts = nd_opt; | |
293 | } else { | |
294 | /* | |
295 | * Unknown options must be silently ignored, | |
296 | * to accommodate future extension to the | |
297 | * protocol. | |
298 | */ | |
299 | ND_PRINTK2(KERN_NOTICE | |
300 | "%s(): ignored unsupported option; type=%d, len=%d\n", | |
0dc47877 | 301 | __func__, |
31910575 PY |
302 | nd_opt->nd_opt_type, nd_opt->nd_opt_len); |
303 | } | |
1da177e4 LT |
304 | } |
305 | opt_len -= l; | |
306 | nd_opt = ((void *)nd_opt) + l; | |
307 | } | |
308 | return ndopts; | |
309 | } | |
310 | ||
311 | static inline u8 *ndisc_opt_addr_data(struct nd_opt_hdr *p, | |
312 | struct net_device *dev) | |
313 | { | |
314 | u8 *lladdr = (u8 *)(p + 1); | |
315 | int lladdrlen = p->nd_opt_len << 3; | |
316 | int prepad = ndisc_addr_option_pad(dev->type); | |
317 | if (lladdrlen != NDISC_OPT_SPACE(dev->addr_len + prepad)) | |
318 | return NULL; | |
a02cec21 | 319 | return lladdr + prepad; |
1da177e4 LT |
320 | } |
321 | ||
b71d1d42 | 322 | int ndisc_mc_map(const struct in6_addr *addr, char *buf, struct net_device *dev, int dir) |
1da177e4 LT |
323 | { |
324 | switch (dev->type) { | |
325 | case ARPHRD_ETHER: | |
326 | case ARPHRD_IEEE802: /* Not sure. Check it later. --ANK */ | |
327 | case ARPHRD_FDDI: | |
328 | ipv6_eth_mc_map(addr, buf); | |
329 | return 0; | |
330 | case ARPHRD_IEEE802_TR: | |
331 | ipv6_tr_mc_map(addr,buf); | |
332 | return 0; | |
333 | case ARPHRD_ARCNET: | |
334 | ipv6_arcnet_mc_map(addr, buf); | |
335 | return 0; | |
336 | case ARPHRD_INFINIBAND: | |
a9e527e3 | 337 | ipv6_ib_mc_map(addr, dev->broadcast, buf); |
1da177e4 | 338 | return 0; |
93ca3bb5 TT |
339 | case ARPHRD_IPGRE: |
340 | return ipv6_ipgre_mc_map(addr, dev->broadcast, buf); | |
1da177e4 LT |
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 |
350 | EXPORT_SYMBOL(ndisc_mc_map); |
351 | ||
d6bf7817 ED |
352 | static u32 ndisc_hash(const void *pkey, |
353 | const struct net_device *dev, | |
2c2aba6c | 354 | __u32 *hash_rnd) |
1da177e4 | 355 | { |
2c2aba6c | 356 | return ndisc_hashfn(pkey, dev, hash_rnd); |
1da177e4 LT |
357 | } |
358 | ||
359 | static int ndisc_constructor(struct neighbour *neigh) | |
360 | { | |
361 | struct in6_addr *addr = (struct in6_addr*)&neigh->primary_key; | |
362 | struct net_device *dev = neigh->dev; | |
363 | struct inet6_dev *in6_dev; | |
364 | struct neigh_parms *parms; | |
365 | int is_multicast = ipv6_addr_is_multicast(addr); | |
366 | ||
1da177e4 LT |
367 | in6_dev = in6_dev_get(dev); |
368 | if (in6_dev == NULL) { | |
1da177e4 LT |
369 | return -EINVAL; |
370 | } | |
371 | ||
372 | parms = in6_dev->nd_parms; | |
373 | __neigh_parms_put(neigh->parms); | |
374 | neigh->parms = neigh_parms_clone(parms); | |
1da177e4 LT |
375 | |
376 | neigh->type = is_multicast ? RTN_MULTICAST : RTN_UNICAST; | |
3b04ddde | 377 | if (!dev->header_ops) { |
1da177e4 LT |
378 | neigh->nud_state = NUD_NOARP; |
379 | neigh->ops = &ndisc_direct_ops; | |
8f40b161 | 380 | neigh->output = neigh_direct_output; |
1da177e4 LT |
381 | } else { |
382 | if (is_multicast) { | |
383 | neigh->nud_state = NUD_NOARP; | |
384 | ndisc_mc_map(addr, neigh->ha, dev, 1); | |
385 | } else if (dev->flags&(IFF_NOARP|IFF_LOOPBACK)) { | |
386 | neigh->nud_state = NUD_NOARP; | |
387 | memcpy(neigh->ha, dev->dev_addr, dev->addr_len); | |
388 | if (dev->flags&IFF_LOOPBACK) | |
389 | neigh->type = RTN_LOCAL; | |
390 | } else if (dev->flags&IFF_POINTOPOINT) { | |
391 | neigh->nud_state = NUD_NOARP; | |
392 | memcpy(neigh->ha, dev->broadcast, dev->addr_len); | |
393 | } | |
3b04ddde | 394 | if (dev->header_ops->cache) |
1da177e4 LT |
395 | neigh->ops = &ndisc_hh_ops; |
396 | else | |
397 | neigh->ops = &ndisc_generic_ops; | |
398 | if (neigh->nud_state&NUD_VALID) | |
399 | neigh->output = neigh->ops->connected_output; | |
400 | else | |
401 | neigh->output = neigh->ops->output; | |
402 | } | |
403 | in6_dev_put(in6_dev); | |
404 | return 0; | |
405 | } | |
406 | ||
407 | static int pndisc_constructor(struct pneigh_entry *n) | |
408 | { | |
409 | struct in6_addr *addr = (struct in6_addr*)&n->key; | |
410 | struct in6_addr maddr; | |
411 | struct net_device *dev = n->dev; | |
412 | ||
413 | if (dev == NULL || __in6_dev_get(dev) == NULL) | |
414 | return -EINVAL; | |
415 | addrconf_addr_solict_mult(addr, &maddr); | |
416 | ipv6_dev_mc_inc(dev, &maddr); | |
417 | return 0; | |
418 | } | |
419 | ||
420 | static void pndisc_destructor(struct pneigh_entry *n) | |
421 | { | |
422 | struct in6_addr *addr = (struct in6_addr*)&n->key; | |
423 | struct in6_addr maddr; | |
424 | struct net_device *dev = n->dev; | |
425 | ||
426 | if (dev == NULL || __in6_dev_get(dev) == NULL) | |
427 | return; | |
428 | addrconf_addr_solict_mult(addr, &maddr); | |
429 | ipv6_dev_mc_dec(dev, &maddr); | |
430 | } | |
431 | ||
305d552a BH |
432 | struct sk_buff *ndisc_build_skb(struct net_device *dev, |
433 | const struct in6_addr *daddr, | |
434 | const struct in6_addr *saddr, | |
435 | struct icmp6hdr *icmp6h, | |
436 | const struct in6_addr *target, | |
437 | int llinfo) | |
1da177e4 | 438 | { |
c346dca1 | 439 | struct net *net = dev_net(dev); |
1762f7e8 | 440 | struct sock *sk = net->ipv6.ndisc_sk; |
1ab1457c | 441 | struct sk_buff *skb; |
e1ec7842 | 442 | struct icmp6hdr *hdr; |
a7ae1992 HX |
443 | int hlen = LL_RESERVED_SPACE(dev); |
444 | int tlen = dev->needed_tailroom; | |
e1ec7842 | 445 | int len; |
1da177e4 | 446 | int err; |
305d552a | 447 | u8 *opt; |
1da177e4 | 448 | |
e1ec7842 YH |
449 | if (!dev->addr_len) |
450 | llinfo = 0; | |
451 | ||
452 | len = sizeof(struct icmp6hdr) + (target ? sizeof(*target) : 0); | |
453 | if (llinfo) | |
454 | len += ndisc_opt_addr_space(dev); | |
1da177e4 | 455 | |
d54a81d3 DM |
456 | skb = sock_alloc_send_skb(sk, |
457 | (MAX_HEADER + sizeof(struct ipv6hdr) + | |
a7ae1992 | 458 | len + hlen + tlen), |
1da177e4 | 459 | 1, &err); |
e1ec7842 | 460 | if (!skb) { |
1da177e4 | 461 | ND_PRINTK0(KERN_ERR |
dae9de8e BH |
462 | "ICMPv6 ND: %s() failed to allocate an skb, err=%d.\n", |
463 | __func__, err); | |
305d552a | 464 | return NULL; |
1da177e4 LT |
465 | } |
466 | ||
a7ae1992 | 467 | skb_reserve(skb, hlen); |
e1ec7842 | 468 | ip6_nd_hdr(sk, skb, dev, saddr, daddr, IPPROTO_ICMPV6, len); |
1da177e4 | 469 | |
27a884dc | 470 | skb->transport_header = skb->tail; |
d10ba34b | 471 | skb_put(skb, len); |
1da177e4 | 472 | |
e1ec7842 YH |
473 | hdr = (struct icmp6hdr *)skb_transport_header(skb); |
474 | memcpy(hdr, icmp6h, sizeof(*hdr)); | |
1da177e4 | 475 | |
e1ec7842 YH |
476 | opt = skb_transport_header(skb) + sizeof(struct icmp6hdr); |
477 | if (target) { | |
4e3fd7a0 | 478 | *(struct in6_addr *)opt = *target; |
e1ec7842 YH |
479 | opt += sizeof(*target); |
480 | } | |
1da177e4 | 481 | |
e1ec7842 YH |
482 | if (llinfo) |
483 | ndisc_fill_addr_option(opt, llinfo, dev->dev_addr, | |
1da177e4 LT |
484 | dev->addr_len, dev->type); |
485 | ||
e1ec7842 YH |
486 | hdr->icmp6_cksum = csum_ipv6_magic(saddr, daddr, len, |
487 | IPPROTO_ICMPV6, | |
07f0757a | 488 | csum_partial(hdr, |
e1ec7842 | 489 | len, 0)); |
1da177e4 | 490 | |
305d552a BH |
491 | return skb; |
492 | } | |
493 | ||
494 | EXPORT_SYMBOL(ndisc_build_skb); | |
495 | ||
496 | void ndisc_send_skb(struct sk_buff *skb, | |
497 | struct net_device *dev, | |
498 | struct neighbour *neigh, | |
499 | const struct in6_addr *daddr, | |
500 | const struct in6_addr *saddr, | |
501 | struct icmp6hdr *icmp6h) | |
502 | { | |
4c9483b2 | 503 | struct flowi6 fl6; |
305d552a BH |
504 | struct dst_entry *dst; |
505 | struct net *net = dev_net(dev); | |
506 | struct sock *sk = net->ipv6.ndisc_sk; | |
507 | struct inet6_dev *idev; | |
508 | int err; | |
509 | u8 type; | |
510 | ||
511 | type = icmp6h->icmp6_type; | |
512 | ||
4c9483b2 | 513 | icmpv6_flow_init(sk, &fl6, type, saddr, daddr, dev->ifindex); |
87a11578 | 514 | dst = icmp6_dst_alloc(dev, neigh, &fl6); |
452edd59 | 515 | if (IS_ERR(dst)) { |
305d552a BH |
516 | kfree_skb(skb); |
517 | return; | |
518 | } | |
519 | ||
adf30907 | 520 | skb_dst_set(skb, dst); |
e1ec7842 | 521 | |
cfdf7647 ED |
522 | rcu_read_lock(); |
523 | idev = __in6_dev_get(dst->dev); | |
edf391ff | 524 | IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len); |
e1ec7842 | 525 | |
b2e0b385 | 526 | err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, dst->dev, |
6e23ae2a | 527 | dst_output); |
1da177e4 | 528 | if (!err) { |
5c5d244b | 529 | ICMP6MSGOUT_INC_STATS(net, idev, type); |
a862f6a6 | 530 | ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); |
1da177e4 LT |
531 | } |
532 | ||
cfdf7647 | 533 | rcu_read_unlock(); |
1ab1457c | 534 | } |
1da177e4 | 535 | |
305d552a BH |
536 | EXPORT_SYMBOL(ndisc_send_skb); |
537 | ||
538 | /* | |
539 | * Send a Neighbour Discover packet | |
540 | */ | |
541 | static void __ndisc_send(struct net_device *dev, | |
542 | struct neighbour *neigh, | |
543 | const struct in6_addr *daddr, | |
544 | const struct in6_addr *saddr, | |
545 | struct icmp6hdr *icmp6h, const struct in6_addr *target, | |
546 | int llinfo) | |
547 | { | |
548 | struct sk_buff *skb; | |
549 | ||
550 | skb = ndisc_build_skb(dev, daddr, saddr, icmp6h, target, llinfo); | |
551 | if (!skb) | |
552 | return; | |
553 | ||
554 | ndisc_send_skb(skb, dev, neigh, daddr, saddr, icmp6h); | |
555 | } | |
556 | ||
e1ec7842 | 557 | static void ndisc_send_na(struct net_device *dev, struct neighbour *neigh, |
9acd9f3a YH |
558 | const struct in6_addr *daddr, |
559 | const struct in6_addr *solicited_addr, | |
560 | int router, int solicited, int override, int inc_opt) | |
e1ec7842 YH |
561 | { |
562 | struct in6_addr tmpaddr; | |
563 | struct inet6_ifaddr *ifp; | |
9acd9f3a | 564 | const struct in6_addr *src_addr; |
e1ec7842 YH |
565 | struct icmp6hdr icmp6h = { |
566 | .icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT, | |
567 | }; | |
568 | ||
569 | /* for anycast or proxy, solicited_addr != src_addr */ | |
c346dca1 | 570 | ifp = ipv6_get_ifaddr(dev_net(dev), solicited_addr, dev, 1); |
e1ec7842 YH |
571 | if (ifp) { |
572 | src_addr = solicited_addr; | |
573 | if (ifp->flags & IFA_F_OPTIMISTIC) | |
574 | override = 0; | |
9f888160 | 575 | inc_opt |= ifp->idev->cnf.force_tllao; |
e1ec7842 YH |
576 | in6_ifa_put(ifp); |
577 | } else { | |
191cd582 | 578 | if (ipv6_dev_get_saddr(dev_net(dev), dev, daddr, |
c346dca1 | 579 | inet6_sk(dev_net(dev)->ipv6.ndisc_sk)->srcprefs, |
7cbca67c | 580 | &tmpaddr)) |
e1ec7842 YH |
581 | return; |
582 | src_addr = &tmpaddr; | |
583 | } | |
584 | ||
585 | icmp6h.icmp6_router = router; | |
586 | icmp6h.icmp6_solicited = solicited; | |
587 | icmp6h.icmp6_override = override; | |
588 | ||
589 | __ndisc_send(dev, neigh, daddr, src_addr, | |
590 | &icmp6h, solicited_addr, | |
14878f75 | 591 | inc_opt ? ND_OPT_TARGET_LL_ADDR : 0); |
e1ec7842 YH |
592 | } |
593 | ||
f47b9464 BH |
594 | static void ndisc_send_unsol_na(struct net_device *dev) |
595 | { | |
596 | struct inet6_dev *idev; | |
597 | struct inet6_ifaddr *ifa; | |
598 | struct in6_addr mcaddr; | |
599 | ||
600 | idev = in6_dev_get(dev); | |
601 | if (!idev) | |
602 | return; | |
603 | ||
604 | read_lock_bh(&idev->lock); | |
605 | list_for_each_entry(ifa, &idev->addr_list, if_list) { | |
606 | addrconf_addr_solict_mult(&ifa->addr, &mcaddr); | |
607 | ndisc_send_na(dev, NULL, &mcaddr, &ifa->addr, | |
608 | /*router=*/ !!idev->cnf.forwarding, | |
609 | /*solicited=*/ false, /*override=*/ true, | |
610 | /*inc_opt=*/ true); | |
611 | } | |
612 | read_unlock_bh(&idev->lock); | |
613 | ||
614 | in6_dev_put(idev); | |
615 | } | |
616 | ||
1da177e4 | 617 | void ndisc_send_ns(struct net_device *dev, struct neighbour *neigh, |
9acd9f3a YH |
618 | const struct in6_addr *solicit, |
619 | const struct in6_addr *daddr, const struct in6_addr *saddr) | |
1da177e4 | 620 | { |
1da177e4 | 621 | struct in6_addr addr_buf; |
e1ec7842 YH |
622 | struct icmp6hdr icmp6h = { |
623 | .icmp6_type = NDISC_NEIGHBOUR_SOLICITATION, | |
624 | }; | |
1da177e4 LT |
625 | |
626 | if (saddr == NULL) { | |
95c385b4 NH |
627 | if (ipv6_get_lladdr(dev, &addr_buf, |
628 | (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC))) | |
1da177e4 LT |
629 | return; |
630 | saddr = &addr_buf; | |
631 | } | |
632 | ||
e1ec7842 YH |
633 | __ndisc_send(dev, neigh, daddr, saddr, |
634 | &icmp6h, solicit, | |
14878f75 | 635 | !ipv6_addr_any(saddr) ? ND_OPT_SOURCE_LL_ADDR : 0); |
1da177e4 LT |
636 | } |
637 | ||
9acd9f3a YH |
638 | void ndisc_send_rs(struct net_device *dev, const struct in6_addr *saddr, |
639 | const struct in6_addr *daddr) | |
1da177e4 | 640 | { |
e1ec7842 YH |
641 | struct icmp6hdr icmp6h = { |
642 | .icmp6_type = NDISC_ROUTER_SOLICITATION, | |
643 | }; | |
95c385b4 | 644 | int send_sllao = dev->addr_len; |
95c385b4 NH |
645 | |
646 | #ifdef CONFIG_IPV6_OPTIMISTIC_DAD | |
647 | /* | |
648 | * According to section 2.2 of RFC 4429, we must not | |
649 | * send router solicitations with a sllao from | |
650 | * optimistic addresses, but we may send the solicitation | |
651 | * if we don't include the sllao. So here we check | |
652 | * if our address is optimistic, and if so, we | |
bea85195 | 653 | * suppress the inclusion of the sllao. |
95c385b4 NH |
654 | */ |
655 | if (send_sllao) { | |
c346dca1 | 656 | struct inet6_ifaddr *ifp = ipv6_get_ifaddr(dev_net(dev), saddr, |
1cab3da6 | 657 | dev, 1); |
95c385b4 NH |
658 | if (ifp) { |
659 | if (ifp->flags & IFA_F_OPTIMISTIC) { | |
ca043569 | 660 | send_sllao = 0; |
95c385b4 | 661 | } |
ca043569 | 662 | in6_ifa_put(ifp); |
95c385b4 NH |
663 | } else { |
664 | send_sllao = 0; | |
665 | } | |
666 | } | |
667 | #endif | |
e1ec7842 YH |
668 | __ndisc_send(dev, NULL, daddr, saddr, |
669 | &icmp6h, NULL, | |
14878f75 | 670 | send_sllao ? ND_OPT_SOURCE_LL_ADDR : 0); |
1da177e4 | 671 | } |
1ab1457c | 672 | |
1da177e4 LT |
673 | |
674 | static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb) | |
675 | { | |
676 | /* | |
677 | * "The sender MUST return an ICMP | |
678 | * destination unreachable" | |
679 | */ | |
680 | dst_link_failure(skb); | |
681 | kfree_skb(skb); | |
682 | } | |
683 | ||
684 | /* Called with locked neigh: either read or both */ | |
685 | ||
686 | static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb) | |
687 | { | |
688 | struct in6_addr *saddr = NULL; | |
689 | struct in6_addr mcaddr; | |
690 | struct net_device *dev = neigh->dev; | |
691 | struct in6_addr *target = (struct in6_addr *)&neigh->primary_key; | |
692 | int probes = atomic_read(&neigh->probes); | |
693 | ||
c346dca1 | 694 | if (skb && ipv6_chk_addr(dev_net(dev), &ipv6_hdr(skb)->saddr, dev, 1)) |
0660e03f | 695 | saddr = &ipv6_hdr(skb)->saddr; |
1da177e4 LT |
696 | |
697 | if ((probes -= neigh->parms->ucast_probes) < 0) { | |
698 | if (!(neigh->nud_state & NUD_VALID)) { | |
5b095d98 | 699 | ND_PRINTK1(KERN_DEBUG "%s(): trying to ucast probe in NUD_INVALID: %pI6\n", |
0c6ce78a | 700 | __func__, target); |
1da177e4 LT |
701 | } |
702 | ndisc_send_ns(dev, neigh, target, target, saddr); | |
703 | } else if ((probes -= neigh->parms->app_probes) < 0) { | |
704 | #ifdef CONFIG_ARPD | |
705 | neigh_app_ns(neigh); | |
706 | #endif | |
707 | } else { | |
708 | addrconf_addr_solict_mult(target, &mcaddr); | |
709 | ndisc_send_ns(dev, NULL, target, &mcaddr, saddr); | |
710 | } | |
711 | } | |
712 | ||
0736ffc0 YH |
713 | static int pndisc_is_router(const void *pkey, |
714 | struct net_device *dev) | |
fa86d322 PE |
715 | { |
716 | struct pneigh_entry *n; | |
0736ffc0 | 717 | int ret = -1; |
fa86d322 PE |
718 | |
719 | read_lock_bh(&nd_tbl.lock); | |
0736ffc0 YH |
720 | n = __pneigh_lookup(&nd_tbl, dev_net(dev), pkey, dev); |
721 | if (n) | |
722 | ret = !!(n->flags & NTF_ROUTER); | |
fa86d322 PE |
723 | read_unlock_bh(&nd_tbl.lock); |
724 | ||
0736ffc0 | 725 | return ret; |
fa86d322 PE |
726 | } |
727 | ||
1da177e4 LT |
728 | static void ndisc_recv_ns(struct sk_buff *skb) |
729 | { | |
9c70220b | 730 | struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb); |
b71d1d42 ED |
731 | const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; |
732 | const struct in6_addr *daddr = &ipv6_hdr(skb)->daddr; | |
1da177e4 | 733 | u8 *lladdr = NULL; |
27a884dc ACM |
734 | u32 ndoptlen = skb->tail - (skb->transport_header + |
735 | offsetof(struct nd_msg, opt)); | |
1da177e4 LT |
736 | struct ndisc_options ndopts; |
737 | struct net_device *dev = skb->dev; | |
738 | struct inet6_ifaddr *ifp; | |
739 | struct inet6_dev *idev = NULL; | |
740 | struct neighbour *neigh; | |
741 | int dad = ipv6_addr_any(saddr); | |
742 | int inc; | |
0736ffc0 | 743 | int is_router = -1; |
1da177e4 LT |
744 | |
745 | if (ipv6_addr_is_multicast(&msg->target)) { | |
1ab1457c | 746 | ND_PRINTK2(KERN_WARNING |
1da177e4 LT |
747 | "ICMPv6 NS: multicast target address"); |
748 | return; | |
749 | } | |
750 | ||
751 | /* | |
752 | * RFC2461 7.1.1: | |
753 | * DAD has to be destined for solicited node multicast address. | |
754 | */ | |
755 | if (dad && | |
756 | !(daddr->s6_addr32[0] == htonl(0xff020000) && | |
757 | daddr->s6_addr32[1] == htonl(0x00000000) && | |
758 | daddr->s6_addr32[2] == htonl(0x00000001) && | |
759 | daddr->s6_addr [12] == 0xff )) { | |
760 | ND_PRINTK2(KERN_WARNING | |
761 | "ICMPv6 NS: bad DAD packet (wrong destination)\n"); | |
762 | return; | |
763 | } | |
764 | ||
765 | if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) { | |
1ab1457c | 766 | ND_PRINTK2(KERN_WARNING |
1da177e4 LT |
767 | "ICMPv6 NS: invalid ND options\n"); |
768 | return; | |
769 | } | |
770 | ||
771 | if (ndopts.nd_opts_src_lladdr) { | |
772 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, dev); | |
773 | if (!lladdr) { | |
774 | ND_PRINTK2(KERN_WARNING | |
775 | "ICMPv6 NS: invalid link-layer address length\n"); | |
776 | return; | |
777 | } | |
778 | ||
779 | /* RFC2461 7.1.1: | |
1ab1457c YH |
780 | * If the IP source address is the unspecified address, |
781 | * there MUST NOT be source link-layer address option | |
1da177e4 LT |
782 | * in the message. |
783 | */ | |
784 | if (dad) { | |
1ab1457c | 785 | ND_PRINTK2(KERN_WARNING |
1da177e4 LT |
786 | "ICMPv6 NS: bad DAD packet (link-layer address option)\n"); |
787 | return; | |
788 | } | |
789 | } | |
790 | ||
791 | inc = ipv6_addr_is_multicast(daddr); | |
792 | ||
c346dca1 | 793 | ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1); |
a18bc695 | 794 | if (ifp) { |
95c385b4 NH |
795 | |
796 | if (ifp->flags & (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC)) { | |
797 | if (dad) { | |
798 | if (dev->type == ARPHRD_IEEE802_TR) { | |
98e399f8 ACM |
799 | const unsigned char *sadr; |
800 | sadr = skb_mac_header(skb); | |
95c385b4 NH |
801 | if (((sadr[8] ^ dev->dev_addr[0]) & 0x7f) == 0 && |
802 | sadr[9] == dev->dev_addr[1] && | |
803 | sadr[10] == dev->dev_addr[2] && | |
804 | sadr[11] == dev->dev_addr[3] && | |
805 | sadr[12] == dev->dev_addr[4] && | |
806 | sadr[13] == dev->dev_addr[5]) { | |
807 | /* looped-back to us */ | |
808 | goto out; | |
809 | } | |
810 | } | |
811 | ||
812 | /* | |
813 | * We are colliding with another node | |
814 | * who is doing DAD | |
815 | * so fail our DAD process | |
816 | */ | |
817 | addrconf_dad_failure(ifp); | |
9e3be4b3 | 818 | return; |
95c385b4 NH |
819 | } else { |
820 | /* | |
821 | * This is not a dad solicitation. | |
822 | * If we are an optimistic node, | |
823 | * we should respond. | |
824 | * Otherwise, we should ignore it. | |
825 | */ | |
826 | if (!(ifp->flags & IFA_F_OPTIMISTIC)) | |
1da177e4 | 827 | goto out; |
1da177e4 | 828 | } |
1da177e4 LT |
829 | } |
830 | ||
831 | idev = ifp->idev; | |
832 | } else { | |
53b7997f YH |
833 | struct net *net = dev_net(dev); |
834 | ||
1da177e4 LT |
835 | idev = in6_dev_get(dev); |
836 | if (!idev) { | |
837 | /* XXX: count this drop? */ | |
838 | return; | |
839 | } | |
840 | ||
53b7997f | 841 | if (ipv6_chk_acast_addr(net, dev, &msg->target) || |
1ab1457c | 842 | (idev->cnf.forwarding && |
53b7997f | 843 | (net->ipv6.devconf_all->proxy_ndp || idev->cnf.proxy_ndp) && |
0736ffc0 | 844 | (is_router = pndisc_is_router(&msg->target, dev)) >= 0)) { |
a61bbcf2 | 845 | if (!(NEIGH_CB(skb)->flags & LOCALLY_ENQUEUED) && |
1da177e4 LT |
846 | skb->pkt_type != PACKET_HOST && |
847 | inc != 0 && | |
848 | idev->nd_parms->proxy_delay != 0) { | |
849 | /* | |
850 | * for anycast or proxy, | |
1ab1457c YH |
851 | * sender should delay its response |
852 | * by a random time between 0 and | |
1da177e4 LT |
853 | * MAX_ANYCAST_DELAY_TIME seconds. |
854 | * (RFC2461) -- yoshfuji | |
855 | */ | |
856 | struct sk_buff *n = skb_clone(skb, GFP_ATOMIC); | |
857 | if (n) | |
858 | pneigh_enqueue(&nd_tbl, idev->nd_parms, n); | |
859 | goto out; | |
860 | } | |
861 | } else | |
862 | goto out; | |
863 | } | |
864 | ||
0736ffc0 YH |
865 | if (is_router < 0) |
866 | is_router = !!idev->cnf.forwarding; | |
62dd9318 | 867 | |
1da177e4 | 868 | if (dad) { |
f3ee4010 | 869 | ndisc_send_na(dev, NULL, &in6addr_linklocal_allnodes, &msg->target, |
62dd9318 | 870 | is_router, 0, (ifp != NULL), 1); |
1da177e4 LT |
871 | goto out; |
872 | } | |
873 | ||
874 | if (inc) | |
875 | NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_mcast); | |
876 | else | |
877 | NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_ucast); | |
878 | ||
1ab1457c | 879 | /* |
1da177e4 LT |
880 | * update / create cache entry |
881 | * for the source address | |
882 | */ | |
883 | neigh = __neigh_lookup(&nd_tbl, saddr, dev, | |
884 | !inc || lladdr || !dev->addr_len); | |
885 | if (neigh) | |
1ab1457c | 886 | neigh_update(neigh, lladdr, NUD_STALE, |
1da177e4 LT |
887 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
888 | NEIGH_UPDATE_F_OVERRIDE); | |
3b04ddde | 889 | if (neigh || !dev->header_ops) { |
1da177e4 | 890 | ndisc_send_na(dev, neigh, saddr, &msg->target, |
62dd9318 | 891 | is_router, |
1da177e4 LT |
892 | 1, (ifp != NULL && inc), inc); |
893 | if (neigh) | |
894 | neigh_release(neigh); | |
895 | } | |
896 | ||
897 | out: | |
898 | if (ifp) | |
899 | in6_ifa_put(ifp); | |
900 | else | |
901 | in6_dev_put(idev); | |
1da177e4 LT |
902 | } |
903 | ||
904 | static void ndisc_recv_na(struct sk_buff *skb) | |
905 | { | |
9c70220b | 906 | struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb); |
b71d1d42 ED |
907 | const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; |
908 | const struct in6_addr *daddr = &ipv6_hdr(skb)->daddr; | |
1da177e4 | 909 | u8 *lladdr = NULL; |
27a884dc ACM |
910 | u32 ndoptlen = skb->tail - (skb->transport_header + |
911 | offsetof(struct nd_msg, opt)); | |
1da177e4 LT |
912 | struct ndisc_options ndopts; |
913 | struct net_device *dev = skb->dev; | |
914 | struct inet6_ifaddr *ifp; | |
915 | struct neighbour *neigh; | |
916 | ||
917 | if (skb->len < sizeof(struct nd_msg)) { | |
918 | ND_PRINTK2(KERN_WARNING | |
919 | "ICMPv6 NA: packet too short\n"); | |
920 | return; | |
921 | } | |
922 | ||
923 | if (ipv6_addr_is_multicast(&msg->target)) { | |
924 | ND_PRINTK2(KERN_WARNING | |
925 | "ICMPv6 NA: target address is multicast.\n"); | |
926 | return; | |
927 | } | |
928 | ||
929 | if (ipv6_addr_is_multicast(daddr) && | |
930 | msg->icmph.icmp6_solicited) { | |
931 | ND_PRINTK2(KERN_WARNING | |
932 | "ICMPv6 NA: solicited NA is multicasted.\n"); | |
933 | return; | |
934 | } | |
1ab1457c | 935 | |
1da177e4 LT |
936 | if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) { |
937 | ND_PRINTK2(KERN_WARNING | |
938 | "ICMPv6 NS: invalid ND option\n"); | |
939 | return; | |
940 | } | |
941 | if (ndopts.nd_opts_tgt_lladdr) { | |
942 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, dev); | |
943 | if (!lladdr) { | |
944 | ND_PRINTK2(KERN_WARNING | |
945 | "ICMPv6 NA: invalid link-layer address length\n"); | |
946 | return; | |
947 | } | |
948 | } | |
c346dca1 | 949 | ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1); |
a18bc695 | 950 | if (ifp) { |
bd015928 DW |
951 | if (skb->pkt_type != PACKET_LOOPBACK |
952 | && (ifp->flags & IFA_F_TENTATIVE)) { | |
953 | addrconf_dad_failure(ifp); | |
954 | return; | |
1da177e4 LT |
955 | } |
956 | /* What should we make now? The advertisement | |
957 | is invalid, but ndisc specs say nothing | |
958 | about it. It could be misconfiguration, or | |
959 | an smart proxy agent tries to help us :-) | |
24fc7b86 JS |
960 | |
961 | We should not print the error if NA has been | |
962 | received from loopback - it is just our own | |
963 | unsolicited advertisement. | |
1da177e4 | 964 | */ |
24fc7b86 JS |
965 | if (skb->pkt_type != PACKET_LOOPBACK) |
966 | ND_PRINTK1(KERN_WARNING | |
a6fa3286 JR |
967 | "ICMPv6 NA: someone advertises our address %pI6 on %s!\n", |
968 | &ifp->addr, ifp->idev->dev->name); | |
1da177e4 LT |
969 | in6_ifa_put(ifp); |
970 | return; | |
971 | } | |
972 | neigh = neigh_lookup(&nd_tbl, &msg->target, dev); | |
973 | ||
974 | if (neigh) { | |
975 | u8 old_flags = neigh->flags; | |
53b7997f | 976 | struct net *net = dev_net(dev); |
1da177e4 LT |
977 | |
978 | if (neigh->nud_state & NUD_FAILED) | |
979 | goto out; | |
980 | ||
5f3e6e9e VN |
981 | /* |
982 | * Don't update the neighbor cache entry on a proxy NA from | |
983 | * ourselves because either the proxied node is off link or it | |
984 | * has already sent a NA to us. | |
985 | */ | |
986 | if (lladdr && !memcmp(lladdr, dev->dev_addr, dev->addr_len) && | |
53b7997f YH |
987 | net->ipv6.devconf_all->forwarding && net->ipv6.devconf_all->proxy_ndp && |
988 | pneigh_lookup(&nd_tbl, net, &msg->target, dev, 0)) { | |
fbea49e1 | 989 | /* XXX: idev->cnf.prixy_ndp */ |
5f3e6e9e | 990 | goto out; |
fbea49e1 | 991 | } |
5f3e6e9e | 992 | |
1da177e4 LT |
993 | neigh_update(neigh, lladdr, |
994 | msg->icmph.icmp6_solicited ? NUD_REACHABLE : NUD_STALE, | |
995 | NEIGH_UPDATE_F_WEAK_OVERRIDE| | |
996 | (msg->icmph.icmp6_override ? NEIGH_UPDATE_F_OVERRIDE : 0)| | |
997 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
998 | (msg->icmph.icmp6_router ? NEIGH_UPDATE_F_ISROUTER : 0)); | |
999 | ||
1000 | if ((old_flags & ~neigh->flags) & NTF_ROUTER) { | |
1001 | /* | |
1002 | * Change: router to host | |
1003 | */ | |
1004 | struct rt6_info *rt; | |
1005 | rt = rt6_get_dflt_router(saddr, dev); | |
1006 | if (rt) | |
e0a1ad73 | 1007 | ip6_del_rt(rt); |
1da177e4 LT |
1008 | } |
1009 | ||
1010 | out: | |
1011 | neigh_release(neigh); | |
1012 | } | |
1013 | } | |
1014 | ||
1015 | static void ndisc_recv_rs(struct sk_buff *skb) | |
1016 | { | |
9c70220b | 1017 | struct rs_msg *rs_msg = (struct rs_msg *)skb_transport_header(skb); |
1da177e4 LT |
1018 | unsigned long ndoptlen = skb->len - sizeof(*rs_msg); |
1019 | struct neighbour *neigh; | |
1020 | struct inet6_dev *idev; | |
b71d1d42 | 1021 | const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; |
1da177e4 LT |
1022 | struct ndisc_options ndopts; |
1023 | u8 *lladdr = NULL; | |
1024 | ||
1025 | if (skb->len < sizeof(*rs_msg)) | |
1026 | return; | |
1027 | ||
cfdf7647 | 1028 | idev = __in6_dev_get(skb->dev); |
1da177e4 LT |
1029 | if (!idev) { |
1030 | if (net_ratelimit()) | |
1031 | ND_PRINTK1("ICMP6 RS: can't find in6 device\n"); | |
1032 | return; | |
1033 | } | |
1034 | ||
1035 | /* Don't accept RS if we're not in router mode */ | |
1036 | if (!idev->cnf.forwarding) | |
1037 | goto out; | |
1038 | ||
1039 | /* | |
1040 | * Don't update NCE if src = ::; | |
1041 | * this implies that the source node has no ip address assigned yet. | |
1042 | */ | |
1043 | if (ipv6_addr_any(saddr)) | |
1044 | goto out; | |
1045 | ||
1046 | /* Parse ND options */ | |
1047 | if (!ndisc_parse_options(rs_msg->opt, ndoptlen, &ndopts)) { | |
1048 | if (net_ratelimit()) | |
1049 | ND_PRINTK2("ICMP6 NS: invalid ND option, ignored\n"); | |
1050 | goto out; | |
1051 | } | |
1052 | ||
1053 | if (ndopts.nd_opts_src_lladdr) { | |
1054 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, | |
1055 | skb->dev); | |
1056 | if (!lladdr) | |
1057 | goto out; | |
1058 | } | |
1059 | ||
1060 | neigh = __neigh_lookup(&nd_tbl, saddr, skb->dev, 1); | |
1061 | if (neigh) { | |
1062 | neigh_update(neigh, lladdr, NUD_STALE, | |
1063 | NEIGH_UPDATE_F_WEAK_OVERRIDE| | |
1064 | NEIGH_UPDATE_F_OVERRIDE| | |
1065 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER); | |
1066 | neigh_release(neigh); | |
1067 | } | |
1068 | out: | |
cfdf7647 | 1069 | return; |
1da177e4 LT |
1070 | } |
1071 | ||
31910575 PY |
1072 | static void ndisc_ra_useropt(struct sk_buff *ra, struct nd_opt_hdr *opt) |
1073 | { | |
1074 | struct icmp6hdr *icmp6h = (struct icmp6hdr *)skb_transport_header(ra); | |
1075 | struct sk_buff *skb; | |
1076 | struct nlmsghdr *nlh; | |
1077 | struct nduseroptmsg *ndmsg; | |
c346dca1 | 1078 | struct net *net = dev_net(ra->dev); |
31910575 PY |
1079 | int err; |
1080 | int base_size = NLMSG_ALIGN(sizeof(struct nduseroptmsg) | |
1081 | + (opt->nd_opt_len << 3)); | |
1082 | size_t msg_size = base_size + nla_total_size(sizeof(struct in6_addr)); | |
1083 | ||
1084 | skb = nlmsg_new(msg_size, GFP_ATOMIC); | |
1085 | if (skb == NULL) { | |
1086 | err = -ENOBUFS; | |
1087 | goto errout; | |
1088 | } | |
1089 | ||
1090 | nlh = nlmsg_put(skb, 0, 0, RTM_NEWNDUSEROPT, base_size, 0); | |
1091 | if (nlh == NULL) { | |
1092 | goto nla_put_failure; | |
1093 | } | |
1094 | ||
1095 | ndmsg = nlmsg_data(nlh); | |
1096 | ndmsg->nduseropt_family = AF_INET6; | |
dbb2ed24 | 1097 | ndmsg->nduseropt_ifindex = ra->dev->ifindex; |
31910575 PY |
1098 | ndmsg->nduseropt_icmp_type = icmp6h->icmp6_type; |
1099 | ndmsg->nduseropt_icmp_code = icmp6h->icmp6_code; | |
1100 | ndmsg->nduseropt_opts_len = opt->nd_opt_len << 3; | |
1101 | ||
1102 | memcpy(ndmsg + 1, opt, opt->nd_opt_len << 3); | |
1103 | ||
c78679e8 DM |
1104 | if (nla_put(skb, NDUSEROPT_SRCADDR, sizeof(struct in6_addr), |
1105 | &ipv6_hdr(ra)->saddr)) | |
1106 | goto nla_put_failure; | |
31910575 PY |
1107 | nlmsg_end(skb, nlh); |
1108 | ||
1ce85fe4 | 1109 | rtnl_notify(skb, net, 0, RTNLGRP_ND_USEROPT, NULL, GFP_ATOMIC); |
31910575 PY |
1110 | return; |
1111 | ||
1112 | nla_put_failure: | |
1113 | nlmsg_free(skb); | |
1114 | err = -EMSGSIZE; | |
1115 | errout: | |
a18bc695 | 1116 | rtnl_set_sk_err(net, RTNLGRP_ND_USEROPT, err); |
31910575 PY |
1117 | } |
1118 | ||
65e9b62d TG |
1119 | static inline int accept_ra(struct inet6_dev *in6_dev) |
1120 | { | |
1121 | /* | |
1122 | * If forwarding is enabled, RA are not accepted unless the special | |
1123 | * hybrid mode (accept_ra=2) is enabled. | |
1124 | */ | |
1125 | if (in6_dev->cnf.forwarding && in6_dev->cnf.accept_ra < 2) | |
1126 | return 0; | |
1127 | ||
1128 | return in6_dev->cnf.accept_ra; | |
1129 | } | |
1130 | ||
1da177e4 LT |
1131 | static void ndisc_router_discovery(struct sk_buff *skb) |
1132 | { | |
9c70220b | 1133 | struct ra_msg *ra_msg = (struct ra_msg *)skb_transport_header(skb); |
1da177e4 LT |
1134 | struct neighbour *neigh = NULL; |
1135 | struct inet6_dev *in6_dev; | |
65f5c7c1 | 1136 | struct rt6_info *rt = NULL; |
1da177e4 LT |
1137 | int lifetime; |
1138 | struct ndisc_options ndopts; | |
1139 | int optlen; | |
ebacaaa0 | 1140 | unsigned int pref = 0; |
1da177e4 LT |
1141 | |
1142 | __u8 * opt = (__u8 *)(ra_msg + 1); | |
1143 | ||
27a884dc | 1144 | optlen = (skb->tail - skb->transport_header) - sizeof(struct ra_msg); |
1da177e4 | 1145 | |
0660e03f | 1146 | if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) { |
1da177e4 LT |
1147 | ND_PRINTK2(KERN_WARNING |
1148 | "ICMPv6 RA: source address is not link-local.\n"); | |
1149 | return; | |
1150 | } | |
1151 | if (optlen < 0) { | |
1ab1457c | 1152 | ND_PRINTK2(KERN_WARNING |
1da177e4 LT |
1153 | "ICMPv6 RA: packet too short\n"); |
1154 | return; | |
1155 | } | |
1156 | ||
de357cc0 | 1157 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 TF |
1158 | if (skb->ndisc_nodetype == NDISC_NODETYPE_HOST) { |
1159 | ND_PRINTK2(KERN_WARNING | |
1160 | "ICMPv6 RA: from host or unauthorized router\n"); | |
1161 | return; | |
1162 | } | |
de357cc0 | 1163 | #endif |
fadf6bf0 | 1164 | |
1da177e4 LT |
1165 | /* |
1166 | * set the RA_RECV flag in the interface | |
1167 | */ | |
1168 | ||
cfdf7647 | 1169 | in6_dev = __in6_dev_get(skb->dev); |
1da177e4 LT |
1170 | if (in6_dev == NULL) { |
1171 | ND_PRINTK0(KERN_ERR | |
1172 | "ICMPv6 RA: can't find inet6 device for %s.\n", | |
1173 | skb->dev->name); | |
1174 | return; | |
1175 | } | |
1da177e4 LT |
1176 | |
1177 | if (!ndisc_parse_options(opt, optlen, &ndopts)) { | |
1da177e4 LT |
1178 | ND_PRINTK2(KERN_WARNING |
1179 | "ICMP6 RA: invalid ND options\n"); | |
1180 | return; | |
1181 | } | |
1182 | ||
65e9b62d | 1183 | if (!accept_ra(in6_dev)) |
31ce8c71 DW |
1184 | goto skip_linkparms; |
1185 | ||
de357cc0 | 1186 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 TF |
1187 | /* skip link-specific parameters from interior routers */ |
1188 | if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT) | |
1189 | goto skip_linkparms; | |
de357cc0 | 1190 | #endif |
fadf6bf0 | 1191 | |
1da177e4 LT |
1192 | if (in6_dev->if_flags & IF_RS_SENT) { |
1193 | /* | |
1194 | * flag that an RA was received after an RS was sent | |
1195 | * out on this interface. | |
1196 | */ | |
1197 | in6_dev->if_flags |= IF_RA_RCVD; | |
1198 | } | |
1199 | ||
1200 | /* | |
1201 | * Remember the managed/otherconf flags from most recently | |
1202 | * received RA message (RFC 2462) -- yoshfuji | |
1203 | */ | |
1204 | in6_dev->if_flags = (in6_dev->if_flags & ~(IF_RA_MANAGED | | |
1205 | IF_RA_OTHERCONF)) | | |
1206 | (ra_msg->icmph.icmp6_addrconf_managed ? | |
1207 | IF_RA_MANAGED : 0) | | |
1208 | (ra_msg->icmph.icmp6_addrconf_other ? | |
1209 | IF_RA_OTHERCONF : 0); | |
1210 | ||
65f5c7c1 YH |
1211 | if (!in6_dev->cnf.accept_ra_defrtr) |
1212 | goto skip_defrtr; | |
1213 | ||
9f56220f AH |
1214 | if (ipv6_chk_addr(dev_net(in6_dev->dev), &ipv6_hdr(skb)->saddr, NULL, 0)) |
1215 | goto skip_defrtr; | |
1216 | ||
1da177e4 LT |
1217 | lifetime = ntohs(ra_msg->icmph.icmp6_rt_lifetime); |
1218 | ||
ebacaaa0 YH |
1219 | #ifdef CONFIG_IPV6_ROUTER_PREF |
1220 | pref = ra_msg->icmph.icmp6_router_pref; | |
1221 | /* 10b is handled as if it were 00b (medium) */ | |
930d6ff2 | 1222 | if (pref == ICMPV6_ROUTER_PREF_INVALID || |
6d5b78cd | 1223 | !in6_dev->cnf.accept_ra_rtr_pref) |
ebacaaa0 YH |
1224 | pref = ICMPV6_ROUTER_PREF_MEDIUM; |
1225 | #endif | |
1226 | ||
0660e03f | 1227 | rt = rt6_get_dflt_router(&ipv6_hdr(skb)->saddr, skb->dev); |
1da177e4 | 1228 | |
eb857186 DM |
1229 | if (rt) { |
1230 | neigh = dst_neigh_lookup(&rt->dst, &ipv6_hdr(skb)->saddr); | |
1231 | if (!neigh) { | |
1232 | ND_PRINTK0(KERN_ERR | |
1233 | "ICMPv6 RA: %s() got default router without neighbour.\n", | |
1234 | __func__); | |
1235 | dst_release(&rt->dst); | |
1236 | return; | |
1237 | } | |
1238 | } | |
1da177e4 | 1239 | if (rt && lifetime == 0) { |
e0a1ad73 | 1240 | ip6_del_rt(rt); |
1da177e4 LT |
1241 | rt = NULL; |
1242 | } | |
1243 | ||
1244 | if (rt == NULL && lifetime) { | |
1245 | ND_PRINTK3(KERN_DEBUG | |
1246 | "ICMPv6 RA: adding default router.\n"); | |
1247 | ||
0660e03f | 1248 | rt = rt6_add_dflt_router(&ipv6_hdr(skb)->saddr, skb->dev, pref); |
1da177e4 LT |
1249 | if (rt == NULL) { |
1250 | ND_PRINTK0(KERN_ERR | |
1251 | "ICMPv6 RA: %s() failed to add default route.\n", | |
0dc47877 | 1252 | __func__); |
1da177e4 LT |
1253 | return; |
1254 | } | |
1255 | ||
eb857186 | 1256 | neigh = dst_neigh_lookup(&rt->dst, &ipv6_hdr(skb)->saddr); |
1da177e4 LT |
1257 | if (neigh == NULL) { |
1258 | ND_PRINTK0(KERN_ERR | |
1259 | "ICMPv6 RA: %s() got default router without neighbour.\n", | |
0dc47877 | 1260 | __func__); |
d8d1f30b | 1261 | dst_release(&rt->dst); |
1da177e4 LT |
1262 | return; |
1263 | } | |
1264 | neigh->flags |= NTF_ROUTER; | |
ebacaaa0 | 1265 | } else if (rt) { |
22441cfa | 1266 | rt->rt6i_flags = (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); |
1da177e4 LT |
1267 | } |
1268 | ||
1269 | if (rt) | |
1716a961 | 1270 | rt6_set_expires(rt, jiffies + (HZ * lifetime)); |
1da177e4 LT |
1271 | if (ra_msg->icmph.icmp6_hop_limit) { |
1272 | in6_dev->cnf.hop_limit = ra_msg->icmph.icmp6_hop_limit; | |
1273 | if (rt) | |
defb3519 DM |
1274 | dst_metric_set(&rt->dst, RTAX_HOPLIMIT, |
1275 | ra_msg->icmph.icmp6_hop_limit); | |
1da177e4 LT |
1276 | } |
1277 | ||
65f5c7c1 YH |
1278 | skip_defrtr: |
1279 | ||
1da177e4 LT |
1280 | /* |
1281 | * Update Reachable Time and Retrans Timer | |
1282 | */ | |
1283 | ||
1284 | if (in6_dev->nd_parms) { | |
1285 | unsigned long rtime = ntohl(ra_msg->retrans_timer); | |
1286 | ||
1287 | if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/HZ) { | |
1288 | rtime = (rtime*HZ)/1000; | |
1289 | if (rtime < HZ/10) | |
1290 | rtime = HZ/10; | |
1291 | in6_dev->nd_parms->retrans_time = rtime; | |
1292 | in6_dev->tstamp = jiffies; | |
1293 | inet6_ifinfo_notify(RTM_NEWLINK, in6_dev); | |
1294 | } | |
1295 | ||
1296 | rtime = ntohl(ra_msg->reachable_time); | |
1297 | if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/(3*HZ)) { | |
1298 | rtime = (rtime*HZ)/1000; | |
1299 | ||
1300 | if (rtime < HZ/10) | |
1301 | rtime = HZ/10; | |
1302 | ||
1303 | if (rtime != in6_dev->nd_parms->base_reachable_time) { | |
1304 | in6_dev->nd_parms->base_reachable_time = rtime; | |
1305 | in6_dev->nd_parms->gc_staletime = 3 * rtime; | |
1306 | in6_dev->nd_parms->reachable_time = neigh_rand_reach_time(rtime); | |
1307 | in6_dev->tstamp = jiffies; | |
1308 | inet6_ifinfo_notify(RTM_NEWLINK, in6_dev); | |
1309 | } | |
1310 | } | |
1311 | } | |
1312 | ||
fadf6bf0 TF |
1313 | skip_linkparms: |
1314 | ||
1da177e4 LT |
1315 | /* |
1316 | * Process options. | |
1317 | */ | |
1318 | ||
1319 | if (!neigh) | |
0660e03f | 1320 | neigh = __neigh_lookup(&nd_tbl, &ipv6_hdr(skb)->saddr, |
1da177e4 LT |
1321 | skb->dev, 1); |
1322 | if (neigh) { | |
1323 | u8 *lladdr = NULL; | |
1324 | if (ndopts.nd_opts_src_lladdr) { | |
1325 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, | |
1326 | skb->dev); | |
1327 | if (!lladdr) { | |
1328 | ND_PRINTK2(KERN_WARNING | |
1329 | "ICMPv6 RA: invalid link-layer address length\n"); | |
1330 | goto out; | |
1331 | } | |
1332 | } | |
1333 | neigh_update(neigh, lladdr, NUD_STALE, | |
1334 | NEIGH_UPDATE_F_WEAK_OVERRIDE| | |
1335 | NEIGH_UPDATE_F_OVERRIDE| | |
1336 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
1337 | NEIGH_UPDATE_F_ISROUTER); | |
1338 | } | |
1339 | ||
65e9b62d | 1340 | if (!accept_ra(in6_dev)) |
31ce8c71 DW |
1341 | goto out; |
1342 | ||
70ceb4f5 | 1343 | #ifdef CONFIG_IPV6_ROUTE_INFO |
9f56220f AH |
1344 | if (ipv6_chk_addr(dev_net(in6_dev->dev), &ipv6_hdr(skb)->saddr, NULL, 0)) |
1345 | goto skip_routeinfo; | |
1346 | ||
09c884d4 | 1347 | if (in6_dev->cnf.accept_ra_rtr_pref && ndopts.nd_opts_ri) { |
70ceb4f5 YH |
1348 | struct nd_opt_hdr *p; |
1349 | for (p = ndopts.nd_opts_ri; | |
1350 | p; | |
1351 | p = ndisc_next_option(p, ndopts.nd_opts_ri_end)) { | |
6294e000 YH |
1352 | struct route_info *ri = (struct route_info *)p; |
1353 | #ifdef CONFIG_IPV6_NDISC_NODETYPE | |
1354 | if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT && | |
1355 | ri->prefix_len == 0) | |
1356 | continue; | |
1357 | #endif | |
1358 | if (ri->prefix_len > in6_dev->cnf.accept_ra_rt_info_max_plen) | |
09c884d4 | 1359 | continue; |
70ceb4f5 | 1360 | rt6_route_rcv(skb->dev, (u8*)p, (p->nd_opt_len) << 3, |
0660e03f | 1361 | &ipv6_hdr(skb)->saddr); |
70ceb4f5 YH |
1362 | } |
1363 | } | |
9f56220f AH |
1364 | |
1365 | skip_routeinfo: | |
70ceb4f5 YH |
1366 | #endif |
1367 | ||
de357cc0 | 1368 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 TF |
1369 | /* skip link-specific ndopts from interior routers */ |
1370 | if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT) | |
1371 | goto out; | |
de357cc0 | 1372 | #endif |
fadf6bf0 | 1373 | |
c4fd30eb | 1374 | if (in6_dev->cnf.accept_ra_pinfo && ndopts.nd_opts_pi) { |
1da177e4 LT |
1375 | struct nd_opt_hdr *p; |
1376 | for (p = ndopts.nd_opts_pi; | |
1377 | p; | |
1378 | p = ndisc_next_option(p, ndopts.nd_opts_pi_end)) { | |
e6bff995 NH |
1379 | addrconf_prefix_rcv(skb->dev, (u8 *)p, |
1380 | (p->nd_opt_len) << 3, | |
1381 | ndopts.nd_opts_src_lladdr != NULL); | |
1da177e4 LT |
1382 | } |
1383 | } | |
1384 | ||
1385 | if (ndopts.nd_opts_mtu) { | |
e69a4adc | 1386 | __be32 n; |
1da177e4 LT |
1387 | u32 mtu; |
1388 | ||
e69a4adc AV |
1389 | memcpy(&n, ((u8*)(ndopts.nd_opts_mtu+1))+2, sizeof(mtu)); |
1390 | mtu = ntohl(n); | |
1da177e4 LT |
1391 | |
1392 | if (mtu < IPV6_MIN_MTU || mtu > skb->dev->mtu) { | |
1393 | ND_PRINTK2(KERN_WARNING | |
1394 | "ICMPv6 RA: invalid mtu: %d\n", | |
1395 | mtu); | |
1396 | } else if (in6_dev->cnf.mtu6 != mtu) { | |
1397 | in6_dev->cnf.mtu6 = mtu; | |
1398 | ||
1399 | if (rt) | |
defb3519 | 1400 | dst_metric_set(&rt->dst, RTAX_MTU, mtu); |
1da177e4 LT |
1401 | |
1402 | rt6_mtu_change(skb->dev, mtu); | |
1403 | } | |
1404 | } | |
1ab1457c | 1405 | |
31910575 | 1406 | if (ndopts.nd_useropts) { |
61cf46ad YH |
1407 | struct nd_opt_hdr *p; |
1408 | for (p = ndopts.nd_useropts; | |
1409 | p; | |
1410 | p = ndisc_next_useropt(p, ndopts.nd_useropts_end)) { | |
1411 | ndisc_ra_useropt(skb, p); | |
31910575 PY |
1412 | } |
1413 | } | |
1414 | ||
1da177e4 LT |
1415 | if (ndopts.nd_opts_tgt_lladdr || ndopts.nd_opts_rh) { |
1416 | ND_PRINTK2(KERN_WARNING | |
1417 | "ICMPv6 RA: invalid RA options"); | |
1418 | } | |
1419 | out: | |
1420 | if (rt) | |
d8d1f30b | 1421 | dst_release(&rt->dst); |
eb857186 | 1422 | if (neigh) |
1da177e4 | 1423 | neigh_release(neigh); |
1da177e4 LT |
1424 | } |
1425 | ||
1426 | static void ndisc_redirect_rcv(struct sk_buff *skb) | |
1427 | { | |
1428 | struct inet6_dev *in6_dev; | |
1429 | struct icmp6hdr *icmph; | |
b71d1d42 ED |
1430 | const struct in6_addr *dest; |
1431 | const struct in6_addr *target; /* new first hop to destination */ | |
1da177e4 LT |
1432 | struct neighbour *neigh; |
1433 | int on_link = 0; | |
1434 | struct ndisc_options ndopts; | |
1435 | int optlen; | |
1436 | u8 *lladdr = NULL; | |
1437 | ||
de357cc0 | 1438 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 TF |
1439 | switch (skb->ndisc_nodetype) { |
1440 | case NDISC_NODETYPE_HOST: | |
1441 | case NDISC_NODETYPE_NODEFAULT: | |
1442 | ND_PRINTK2(KERN_WARNING | |
1443 | "ICMPv6 Redirect: from host or unauthorized router\n"); | |
1444 | return; | |
1445 | } | |
de357cc0 | 1446 | #endif |
fadf6bf0 | 1447 | |
0660e03f | 1448 | if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) { |
1da177e4 LT |
1449 | ND_PRINTK2(KERN_WARNING |
1450 | "ICMPv6 Redirect: source address is not link-local.\n"); | |
1451 | return; | |
1452 | } | |
1453 | ||
27a884dc | 1454 | optlen = skb->tail - skb->transport_header; |
1da177e4 LT |
1455 | optlen -= sizeof(struct icmp6hdr) + 2 * sizeof(struct in6_addr); |
1456 | ||
1457 | if (optlen < 0) { | |
1458 | ND_PRINTK2(KERN_WARNING | |
1459 | "ICMPv6 Redirect: packet too short\n"); | |
1460 | return; | |
1461 | } | |
1462 | ||
cc70ab26 | 1463 | icmph = icmp6_hdr(skb); |
b71d1d42 | 1464 | target = (const struct in6_addr *) (icmph + 1); |
1da177e4 LT |
1465 | dest = target + 1; |
1466 | ||
1467 | if (ipv6_addr_is_multicast(dest)) { | |
1468 | ND_PRINTK2(KERN_WARNING | |
1469 | "ICMPv6 Redirect: destination address is multicast.\n"); | |
1470 | return; | |
1471 | } | |
1472 | ||
1473 | if (ipv6_addr_equal(dest, target)) { | |
1474 | on_link = 1; | |
bf0b48df BH |
1475 | } else if (ipv6_addr_type(target) != |
1476 | (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) { | |
1ab1457c | 1477 | ND_PRINTK2(KERN_WARNING |
bf0b48df | 1478 | "ICMPv6 Redirect: target address is not link-local unicast.\n"); |
1da177e4 LT |
1479 | return; |
1480 | } | |
1481 | ||
cfdf7647 | 1482 | in6_dev = __in6_dev_get(skb->dev); |
1da177e4 LT |
1483 | if (!in6_dev) |
1484 | return; | |
cfdf7647 | 1485 | if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects) |
1da177e4 | 1486 | return; |
1da177e4 | 1487 | |
1ab1457c | 1488 | /* RFC2461 8.1: |
1da177e4 LT |
1489 | * The IP source address of the Redirect MUST be the same as the current |
1490 | * first-hop router for the specified ICMP Destination Address. | |
1491 | */ | |
1ab1457c | 1492 | |
1da177e4 LT |
1493 | if (!ndisc_parse_options((u8*)(dest + 1), optlen, &ndopts)) { |
1494 | ND_PRINTK2(KERN_WARNING | |
1495 | "ICMPv6 Redirect: invalid ND options\n"); | |
1da177e4 LT |
1496 | return; |
1497 | } | |
1498 | if (ndopts.nd_opts_tgt_lladdr) { | |
1499 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, | |
1500 | skb->dev); | |
1501 | if (!lladdr) { | |
1502 | ND_PRINTK2(KERN_WARNING | |
1503 | "ICMPv6 Redirect: invalid link-layer address length\n"); | |
1da177e4 LT |
1504 | return; |
1505 | } | |
1506 | } | |
1507 | ||
1508 | neigh = __neigh_lookup(&nd_tbl, target, skb->dev, 1); | |
1509 | if (neigh) { | |
0660e03f ACM |
1510 | rt6_redirect(dest, &ipv6_hdr(skb)->daddr, |
1511 | &ipv6_hdr(skb)->saddr, neigh, lladdr, | |
1da177e4 LT |
1512 | on_link); |
1513 | neigh_release(neigh); | |
1514 | } | |
1da177e4 LT |
1515 | } |
1516 | ||
4991969a | 1517 | void ndisc_send_redirect(struct sk_buff *skb, const struct in6_addr *target) |
1da177e4 | 1518 | { |
1762f7e8 | 1519 | struct net_device *dev = skb->dev; |
c346dca1 | 1520 | struct net *net = dev_net(dev); |
1762f7e8 | 1521 | struct sock *sk = net->ipv6.ndisc_sk; |
1da177e4 LT |
1522 | int len = sizeof(struct icmp6hdr) + 2 * sizeof(struct in6_addr); |
1523 | struct sk_buff *buff; | |
1524 | struct icmp6hdr *icmph; | |
1525 | struct in6_addr saddr_buf; | |
1526 | struct in6_addr *addrp; | |
1da177e4 LT |
1527 | struct rt6_info *rt; |
1528 | struct dst_entry *dst; | |
1529 | struct inet6_dev *idev; | |
4c9483b2 | 1530 | struct flowi6 fl6; |
1da177e4 | 1531 | u8 *opt; |
a7ae1992 | 1532 | int hlen, tlen; |
1da177e4 LT |
1533 | int rd_len; |
1534 | int err; | |
1da177e4 LT |
1535 | u8 ha_buf[MAX_ADDR_LEN], *ha = NULL; |
1536 | ||
95c385b4 | 1537 | if (ipv6_get_lladdr(dev, &saddr_buf, IFA_F_TENTATIVE)) { |
1da177e4 LT |
1538 | ND_PRINTK2(KERN_WARNING |
1539 | "ICMPv6 Redirect: no link-local address on %s\n", | |
1540 | dev->name); | |
1ab1457c YH |
1541 | return; |
1542 | } | |
1da177e4 | 1543 | |
0660e03f | 1544 | if (!ipv6_addr_equal(&ipv6_hdr(skb)->daddr, target) && |
bf0b48df | 1545 | ipv6_addr_type(target) != (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) { |
29556526 | 1546 | ND_PRINTK2(KERN_WARNING |
bf0b48df | 1547 | "ICMPv6 Redirect: target address is not link-local unicast.\n"); |
29556526 LY |
1548 | return; |
1549 | } | |
1550 | ||
4c9483b2 | 1551 | icmpv6_flow_init(sk, &fl6, NDISC_REDIRECT, |
95e41e93 | 1552 | &saddr_buf, &ipv6_hdr(skb)->saddr, dev->ifindex); |
1da177e4 | 1553 | |
4c9483b2 | 1554 | dst = ip6_route_output(net, NULL, &fl6); |
5095d64d RL |
1555 | if (dst->error) { |
1556 | dst_release(dst); | |
1da177e4 | 1557 | return; |
5095d64d | 1558 | } |
4c9483b2 | 1559 | dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), NULL, 0); |
452edd59 | 1560 | if (IS_ERR(dst)) |
1da177e4 | 1561 | return; |
1da177e4 LT |
1562 | |
1563 | rt = (struct rt6_info *) dst; | |
1564 | ||
1565 | if (rt->rt6i_flags & RTF_GATEWAY) { | |
1566 | ND_PRINTK2(KERN_WARNING | |
1567 | "ICMPv6 Redirect: destination is not a neighbour.\n"); | |
d73f0801 | 1568 | goto release; |
1da177e4 | 1569 | } |
92d86829 DM |
1570 | if (!rt->rt6i_peer) |
1571 | rt6_bind_peer(rt, 1); | |
4d65a246 | 1572 | if (!inet_peer_xrlim_allow(rt->rt6i_peer, 1*HZ)) |
d73f0801 | 1573 | goto release; |
1da177e4 LT |
1574 | |
1575 | if (dev->addr_len) { | |
4991969a DM |
1576 | struct neighbour *neigh = dst_neigh_lookup(skb_dst(skb), target); |
1577 | if (!neigh) { | |
1578 | ND_PRINTK2(KERN_WARNING | |
1579 | "ICMPv6 Redirect: no neigh for target address\n"); | |
1580 | goto release; | |
1581 | } | |
1582 | ||
1da177e4 LT |
1583 | read_lock_bh(&neigh->lock); |
1584 | if (neigh->nud_state & NUD_VALID) { | |
1585 | memcpy(ha_buf, neigh->ha, dev->addr_len); | |
1586 | read_unlock_bh(&neigh->lock); | |
1587 | ha = ha_buf; | |
1588 | len += ndisc_opt_addr_space(dev); | |
1589 | } else | |
1590 | read_unlock_bh(&neigh->lock); | |
4991969a DM |
1591 | |
1592 | neigh_release(neigh); | |
1da177e4 LT |
1593 | } |
1594 | ||
1595 | rd_len = min_t(unsigned int, | |
1596 | IPV6_MIN_MTU-sizeof(struct ipv6hdr)-len, skb->len + 8); | |
1597 | rd_len &= ~0x7; | |
1598 | len += rd_len; | |
1599 | ||
a7ae1992 HX |
1600 | hlen = LL_RESERVED_SPACE(dev); |
1601 | tlen = dev->needed_tailroom; | |
d54a81d3 DM |
1602 | buff = sock_alloc_send_skb(sk, |
1603 | (MAX_HEADER + sizeof(struct ipv6hdr) + | |
a7ae1992 | 1604 | len + hlen + tlen), |
1da177e4 LT |
1605 | 1, &err); |
1606 | if (buff == NULL) { | |
1607 | ND_PRINTK0(KERN_ERR | |
dae9de8e BH |
1608 | "ICMPv6 Redirect: %s() failed to allocate an skb, err=%d.\n", |
1609 | __func__, err); | |
d73f0801 | 1610 | goto release; |
1da177e4 LT |
1611 | } |
1612 | ||
a7ae1992 | 1613 | skb_reserve(buff, hlen); |
0660e03f | 1614 | ip6_nd_hdr(sk, buff, dev, &saddr_buf, &ipv6_hdr(skb)->saddr, |
1da177e4 LT |
1615 | IPPROTO_ICMPV6, len); |
1616 | ||
27a884dc | 1617 | skb_set_transport_header(buff, skb_tail_pointer(buff) - buff->data); |
d10ba34b ACM |
1618 | skb_put(buff, len); |
1619 | icmph = icmp6_hdr(buff); | |
1da177e4 LT |
1620 | |
1621 | memset(icmph, 0, sizeof(struct icmp6hdr)); | |
1622 | icmph->icmp6_type = NDISC_REDIRECT; | |
1623 | ||
1624 | /* | |
1625 | * copy target and destination addresses | |
1626 | */ | |
1627 | ||
1628 | addrp = (struct in6_addr *)(icmph + 1); | |
4e3fd7a0 | 1629 | *addrp = *target; |
1da177e4 | 1630 | addrp++; |
4e3fd7a0 | 1631 | *addrp = ipv6_hdr(skb)->daddr; |
1da177e4 LT |
1632 | |
1633 | opt = (u8*) (addrp + 1); | |
1634 | ||
1635 | /* | |
1636 | * include target_address option | |
1637 | */ | |
1638 | ||
1639 | if (ha) | |
1640 | opt = ndisc_fill_addr_option(opt, ND_OPT_TARGET_LL_ADDR, ha, | |
1641 | dev->addr_len, dev->type); | |
1642 | ||
1643 | /* | |
1644 | * build redirect option and copy skb over to the new packet. | |
1645 | */ | |
1646 | ||
1ab1457c | 1647 | memset(opt, 0, 8); |
1da177e4 LT |
1648 | *(opt++) = ND_OPT_REDIRECT_HDR; |
1649 | *(opt++) = (rd_len >> 3); | |
1650 | opt += 6; | |
1651 | ||
0660e03f | 1652 | memcpy(opt, ipv6_hdr(skb), rd_len - 8); |
1da177e4 | 1653 | |
0660e03f | 1654 | icmph->icmp6_cksum = csum_ipv6_magic(&saddr_buf, &ipv6_hdr(skb)->saddr, |
1da177e4 | 1655 | len, IPPROTO_ICMPV6, |
07f0757a | 1656 | csum_partial(icmph, len, 0)); |
1da177e4 | 1657 | |
adf30907 | 1658 | skb_dst_set(buff, dst); |
cfdf7647 ED |
1659 | rcu_read_lock(); |
1660 | idev = __in6_dev_get(dst->dev); | |
edf391ff | 1661 | IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len); |
b2e0b385 | 1662 | err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, buff, NULL, dst->dev, |
6e23ae2a | 1663 | dst_output); |
1da177e4 | 1664 | if (!err) { |
5c5d244b | 1665 | ICMP6MSGOUT_INC_STATS(net, idev, NDISC_REDIRECT); |
a862f6a6 | 1666 | ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); |
1da177e4 LT |
1667 | } |
1668 | ||
cfdf7647 | 1669 | rcu_read_unlock(); |
d73f0801 IJ |
1670 | return; |
1671 | ||
1672 | release: | |
1673 | dst_release(dst); | |
1da177e4 LT |
1674 | } |
1675 | ||
1676 | static void pndisc_redo(struct sk_buff *skb) | |
1677 | { | |
140e26fc | 1678 | ndisc_recv_ns(skb); |
1da177e4 LT |
1679 | kfree_skb(skb); |
1680 | } | |
1681 | ||
1682 | int ndisc_rcv(struct sk_buff *skb) | |
1683 | { | |
1684 | struct nd_msg *msg; | |
1685 | ||
1686 | if (!pskb_may_pull(skb, skb->len)) | |
1687 | return 0; | |
1688 | ||
9c70220b | 1689 | msg = (struct nd_msg *)skb_transport_header(skb); |
1da177e4 | 1690 | |
9c70220b | 1691 | __skb_push(skb, skb->data - skb_transport_header(skb)); |
1da177e4 | 1692 | |
0660e03f | 1693 | if (ipv6_hdr(skb)->hop_limit != 255) { |
1da177e4 LT |
1694 | ND_PRINTK2(KERN_WARNING |
1695 | "ICMPv6 NDISC: invalid hop-limit: %d\n", | |
0660e03f | 1696 | ipv6_hdr(skb)->hop_limit); |
1da177e4 LT |
1697 | return 0; |
1698 | } | |
1699 | ||
1700 | if (msg->icmph.icmp6_code != 0) { | |
1ab1457c | 1701 | ND_PRINTK2(KERN_WARNING |
1da177e4 LT |
1702 | "ICMPv6 NDISC: invalid ICMPv6 code: %d\n", |
1703 | msg->icmph.icmp6_code); | |
1704 | return 0; | |
1705 | } | |
1706 | ||
a61bbcf2 PM |
1707 | memset(NEIGH_CB(skb), 0, sizeof(struct neighbour_cb)); |
1708 | ||
1da177e4 LT |
1709 | switch (msg->icmph.icmp6_type) { |
1710 | case NDISC_NEIGHBOUR_SOLICITATION: | |
1711 | ndisc_recv_ns(skb); | |
1712 | break; | |
1713 | ||
1714 | case NDISC_NEIGHBOUR_ADVERTISEMENT: | |
1715 | ndisc_recv_na(skb); | |
1716 | break; | |
1717 | ||
1718 | case NDISC_ROUTER_SOLICITATION: | |
1719 | ndisc_recv_rs(skb); | |
1720 | break; | |
1721 | ||
1722 | case NDISC_ROUTER_ADVERTISEMENT: | |
1723 | ndisc_router_discovery(skb); | |
1724 | break; | |
1725 | ||
1726 | case NDISC_REDIRECT: | |
1727 | ndisc_redirect_rcv(skb); | |
1728 | break; | |
3ff50b79 | 1729 | } |
1da177e4 LT |
1730 | |
1731 | return 0; | |
1732 | } | |
1733 | ||
1734 | static int ndisc_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1735 | { | |
1736 | struct net_device *dev = ptr; | |
c346dca1 | 1737 | struct net *net = dev_net(dev); |
1da177e4 LT |
1738 | |
1739 | switch (event) { | |
1740 | case NETDEV_CHANGEADDR: | |
1741 | neigh_changeaddr(&nd_tbl, dev); | |
5b7c931d | 1742 | fib6_run_gc(~0UL, net); |
1da177e4 LT |
1743 | break; |
1744 | case NETDEV_DOWN: | |
1745 | neigh_ifdown(&nd_tbl, dev); | |
5b7c931d | 1746 | fib6_run_gc(~0UL, net); |
1da177e4 | 1747 | break; |
f47b9464 BH |
1748 | case NETDEV_NOTIFY_PEERS: |
1749 | ndisc_send_unsol_na(dev); | |
1750 | break; | |
1da177e4 LT |
1751 | default: |
1752 | break; | |
1753 | } | |
1754 | ||
1755 | return NOTIFY_DONE; | |
1756 | } | |
1757 | ||
1758 | static struct notifier_block ndisc_netdev_notifier = { | |
1759 | .notifier_call = ndisc_netdev_event, | |
1760 | }; | |
1761 | ||
1762 | #ifdef CONFIG_SYSCTL | |
1763 | static void ndisc_warn_deprecated_sysctl(struct ctl_table *ctl, | |
1764 | const char *func, const char *dev_name) | |
1765 | { | |
1766 | static char warncomm[TASK_COMM_LEN]; | |
1767 | static int warned; | |
1768 | if (strcmp(warncomm, current->comm) && warned < 5) { | |
1769 | strcpy(warncomm, current->comm); | |
1770 | printk(KERN_WARNING | |
1771 | "process `%s' is using deprecated sysctl (%s) " | |
1772 | "net.ipv6.neigh.%s.%s; " | |
1773 | "Use net.ipv6.neigh.%s.%s_ms " | |
1774 | "instead.\n", | |
1775 | warncomm, func, | |
1776 | dev_name, ctl->procname, | |
1777 | dev_name, ctl->procname); | |
1778 | warned++; | |
1779 | } | |
1780 | } | |
1781 | ||
8d65af78 | 1782 | int ndisc_ifinfo_sysctl_change(struct ctl_table *ctl, int write, void __user *buffer, size_t *lenp, loff_t *ppos) |
1da177e4 LT |
1783 | { |
1784 | struct net_device *dev = ctl->extra1; | |
1785 | struct inet6_dev *idev; | |
1786 | int ret; | |
1787 | ||
d12af679 EB |
1788 | if ((strcmp(ctl->procname, "retrans_time") == 0) || |
1789 | (strcmp(ctl->procname, "base_reachable_time") == 0)) | |
1da177e4 LT |
1790 | ndisc_warn_deprecated_sysctl(ctl, "syscall", dev ? dev->name : "default"); |
1791 | ||
d12af679 | 1792 | if (strcmp(ctl->procname, "retrans_time") == 0) |
8d65af78 | 1793 | ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
d12af679 EB |
1794 | |
1795 | else if (strcmp(ctl->procname, "base_reachable_time") == 0) | |
1da177e4 | 1796 | ret = proc_dointvec_jiffies(ctl, write, |
8d65af78 | 1797 | buffer, lenp, ppos); |
d12af679 EB |
1798 | |
1799 | else if ((strcmp(ctl->procname, "retrans_time_ms") == 0) || | |
ad02ac14 | 1800 | (strcmp(ctl->procname, "base_reachable_time_ms") == 0)) |
1da177e4 | 1801 | ret = proc_dointvec_ms_jiffies(ctl, write, |
8d65af78 | 1802 | buffer, lenp, ppos); |
d12af679 | 1803 | else |
1da177e4 | 1804 | ret = -1; |
1da177e4 LT |
1805 | |
1806 | if (write && ret == 0 && dev && (idev = in6_dev_get(dev)) != NULL) { | |
d12af679 | 1807 | if (ctl->data == &idev->nd_parms->base_reachable_time) |
1da177e4 LT |
1808 | idev->nd_parms->reachable_time = neigh_rand_reach_time(idev->nd_parms->base_reachable_time); |
1809 | idev->tstamp = jiffies; | |
1810 | inet6_ifinfo_notify(RTM_NEWLINK, idev); | |
1811 | in6_dev_put(idev); | |
1812 | } | |
1813 | return ret; | |
1814 | } | |
1815 | ||
1da177e4 LT |
1816 | |
1817 | #endif | |
1818 | ||
2c8c1e72 | 1819 | static int __net_init ndisc_net_init(struct net *net) |
1da177e4 LT |
1820 | { |
1821 | struct ipv6_pinfo *np; | |
1822 | struct sock *sk; | |
1ab1457c | 1823 | int err; |
1da177e4 | 1824 | |
1ed8516f DL |
1825 | err = inet_ctl_sock_create(&sk, PF_INET6, |
1826 | SOCK_RAW, IPPROTO_ICMPV6, net); | |
1da177e4 LT |
1827 | if (err < 0) { |
1828 | ND_PRINTK0(KERN_ERR | |
1ab1457c | 1829 | "ICMPv6 NDISC: Failed to initialize the control socket (err %d).\n", |
1da177e4 | 1830 | err); |
1da177e4 LT |
1831 | return err; |
1832 | } | |
1833 | ||
1ed8516f | 1834 | net->ipv6.ndisc_sk = sk; |
1762f7e8 | 1835 | |
1da177e4 | 1836 | np = inet6_sk(sk); |
1da177e4 LT |
1837 | np->hop_limit = 255; |
1838 | /* Do not loopback ndisc messages */ | |
1839 | np->mc_loop = 0; | |
1da177e4 | 1840 | |
1762f7e8 DL |
1841 | return 0; |
1842 | } | |
1843 | ||
2c8c1e72 | 1844 | static void __net_exit ndisc_net_exit(struct net *net) |
1762f7e8 | 1845 | { |
1ed8516f | 1846 | inet_ctl_sock_destroy(net->ipv6.ndisc_sk); |
1762f7e8 DL |
1847 | } |
1848 | ||
1849 | static struct pernet_operations ndisc_net_ops = { | |
1850 | .init = ndisc_net_init, | |
1851 | .exit = ndisc_net_exit, | |
1852 | }; | |
1853 | ||
1854 | int __init ndisc_init(void) | |
1855 | { | |
1856 | int err; | |
1857 | ||
1858 | err = register_pernet_subsys(&ndisc_net_ops); | |
1859 | if (err) | |
1860 | return err; | |
1ab1457c YH |
1861 | /* |
1862 | * Initialize the neighbour table | |
1863 | */ | |
1da177e4 LT |
1864 | neigh_table_init(&nd_tbl); |
1865 | ||
1866 | #ifdef CONFIG_SYSCTL | |
54716e3b | 1867 | err = neigh_sysctl_register(NULL, &nd_tbl.parms, "ipv6", |
f8572d8f | 1868 | &ndisc_ifinfo_sysctl_change); |
1762f7e8 DL |
1869 | if (err) |
1870 | goto out_unregister_pernet; | |
1da177e4 | 1871 | #endif |
1762f7e8 DL |
1872 | err = register_netdevice_notifier(&ndisc_netdev_notifier); |
1873 | if (err) | |
1874 | goto out_unregister_sysctl; | |
1875 | out: | |
1876 | return err; | |
1da177e4 | 1877 | |
1762f7e8 DL |
1878 | out_unregister_sysctl: |
1879 | #ifdef CONFIG_SYSCTL | |
1880 | neigh_sysctl_unregister(&nd_tbl.parms); | |
1881 | out_unregister_pernet: | |
1882 | #endif | |
1883 | unregister_pernet_subsys(&ndisc_net_ops); | |
1884 | goto out; | |
1da177e4 LT |
1885 | } |
1886 | ||
1887 | void ndisc_cleanup(void) | |
1888 | { | |
36f73d0c | 1889 | unregister_netdevice_notifier(&ndisc_netdev_notifier); |
1da177e4 LT |
1890 | #ifdef CONFIG_SYSCTL |
1891 | neigh_sysctl_unregister(&nd_tbl.parms); | |
1892 | #endif | |
1893 | neigh_table_clear(&nd_tbl); | |
1762f7e8 | 1894 | unregister_pernet_subsys(&ndisc_net_ops); |
1da177e4 | 1895 | } |