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 | ||
675418d5 | 30 | #define pr_fmt(fmt) "ICMPv6: " fmt |
1da177e4 LT |
31 | |
32 | #include <linux/module.h> | |
1da177e4 LT |
33 | #include <linux/errno.h> |
34 | #include <linux/types.h> | |
35 | #include <linux/socket.h> | |
36 | #include <linux/sockios.h> | |
37 | #include <linux/sched.h> | |
38 | #include <linux/net.h> | |
39 | #include <linux/in6.h> | |
40 | #include <linux/route.h> | |
41 | #include <linux/init.h> | |
42 | #include <linux/rcupdate.h> | |
5a0e3ad6 | 43 | #include <linux/slab.h> |
1da177e4 LT |
44 | #ifdef CONFIG_SYSCTL |
45 | #include <linux/sysctl.h> | |
46 | #endif | |
47 | ||
1823730f | 48 | #include <linux/if_addr.h> |
1da177e4 LT |
49 | #include <linux/if_arp.h> |
50 | #include <linux/ipv6.h> | |
51 | #include <linux/icmpv6.h> | |
52 | #include <linux/jhash.h> | |
53 | ||
54 | #include <net/sock.h> | |
55 | #include <net/snmp.h> | |
56 | ||
57 | #include <net/ipv6.h> | |
58 | #include <net/protocol.h> | |
59 | #include <net/ndisc.h> | |
60 | #include <net/ip6_route.h> | |
61 | #include <net/addrconf.h> | |
62 | #include <net/icmp.h> | |
63 | ||
31910575 PY |
64 | #include <net/netlink.h> |
65 | #include <linux/rtnetlink.h> | |
66 | ||
1da177e4 LT |
67 | #include <net/flow.h> |
68 | #include <net/ip6_checksum.h> | |
1ed8516f | 69 | #include <net/inet_common.h> |
1da177e4 LT |
70 | #include <linux/proc_fs.h> |
71 | ||
72 | #include <linux/netfilter.h> | |
73 | #include <linux/netfilter_ipv6.h> | |
74 | ||
675418d5 JP |
75 | /* Set to 3 to get tracing... */ |
76 | #define ND_DEBUG 1 | |
77 | ||
78 | #define ND_PRINTK(val, level, fmt, ...) \ | |
79 | do { \ | |
80 | if (val <= ND_DEBUG) \ | |
81 | net_##level##_ratelimited(fmt, ##__VA_ARGS__); \ | |
82 | } while (0) | |
83 | ||
d6bf7817 ED |
84 | static u32 ndisc_hash(const void *pkey, |
85 | const struct net_device *dev, | |
2c2aba6c | 86 | __u32 *hash_rnd); |
1da177e4 LT |
87 | static int ndisc_constructor(struct neighbour *neigh); |
88 | static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb); | |
89 | static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb); | |
90 | static int pndisc_constructor(struct pneigh_entry *n); | |
91 | static void pndisc_destructor(struct pneigh_entry *n); | |
92 | static void pndisc_redo(struct sk_buff *skb); | |
93 | ||
89d69d2b | 94 | static const struct neigh_ops ndisc_generic_ops = { |
1da177e4 LT |
95 | .family = AF_INET6, |
96 | .solicit = ndisc_solicit, | |
97 | .error_report = ndisc_error_report, | |
98 | .output = neigh_resolve_output, | |
99 | .connected_output = neigh_connected_output, | |
1da177e4 LT |
100 | }; |
101 | ||
89d69d2b | 102 | static const struct neigh_ops ndisc_hh_ops = { |
1da177e4 LT |
103 | .family = AF_INET6, |
104 | .solicit = ndisc_solicit, | |
105 | .error_report = ndisc_error_report, | |
106 | .output = neigh_resolve_output, | |
107 | .connected_output = neigh_resolve_output, | |
1da177e4 LT |
108 | }; |
109 | ||
110 | ||
89d69d2b | 111 | static const struct neigh_ops ndisc_direct_ops = { |
1da177e4 | 112 | .family = AF_INET6, |
8f40b161 DM |
113 | .output = neigh_direct_output, |
114 | .connected_output = neigh_direct_output, | |
1da177e4 LT |
115 | }; |
116 | ||
117 | struct neigh_table nd_tbl = { | |
118 | .family = AF_INET6, | |
1da177e4 LT |
119 | .key_len = sizeof(struct in6_addr), |
120 | .hash = ndisc_hash, | |
121 | .constructor = ndisc_constructor, | |
122 | .pconstructor = pndisc_constructor, | |
123 | .pdestructor = pndisc_destructor, | |
124 | .proxy_redo = pndisc_redo, | |
125 | .id = "ndisc_cache", | |
126 | .parms = { | |
b672083e SW |
127 | .tbl = &nd_tbl, |
128 | .base_reachable_time = ND_REACHABLE_TIME, | |
129 | .retrans_time = ND_RETRANS_TIMER, | |
130 | .gc_staletime = 60 * HZ, | |
131 | .reachable_time = ND_REACHABLE_TIME, | |
132 | .delay_probe_time = 5 * HZ, | |
8b5c171b | 133 | .queue_len_bytes = 64*1024, |
b672083e SW |
134 | .ucast_probes = 3, |
135 | .mcast_probes = 3, | |
136 | .anycast_delay = 1 * HZ, | |
137 | .proxy_delay = (8 * HZ) / 10, | |
138 | .proxy_qlen = 64, | |
1da177e4 LT |
139 | }, |
140 | .gc_interval = 30 * HZ, | |
141 | .gc_thresh1 = 128, | |
142 | .gc_thresh2 = 512, | |
143 | .gc_thresh3 = 1024, | |
144 | }; | |
145 | ||
315ff09d YH |
146 | static u8 *ndisc_fill_addr_option(u8 *opt, int type, void *data, |
147 | struct net_device *dev) | |
1da177e4 | 148 | { |
315ff09d YH |
149 | int pad = ndisc_addr_option_pad(dev->type); |
150 | int data_len = dev->addr_len; | |
c558e9fc | 151 | int space = ndisc_opt_addr_space(dev); |
1da177e4 LT |
152 | |
153 | opt[0] = type; | |
154 | opt[1] = space>>3; | |
155 | ||
156 | memset(opt + 2, 0, pad); | |
157 | opt += pad; | |
158 | space -= pad; | |
159 | ||
160 | memcpy(opt+2, data, data_len); | |
161 | data_len += 2; | |
162 | opt += data_len; | |
163 | if ((space -= data_len) > 0) | |
164 | memset(opt, 0, space); | |
165 | return opt + space; | |
166 | } | |
167 | ||
168 | static struct nd_opt_hdr *ndisc_next_option(struct nd_opt_hdr *cur, | |
169 | struct nd_opt_hdr *end) | |
170 | { | |
171 | int type; | |
172 | if (!cur || !end || cur >= end) | |
173 | return NULL; | |
174 | type = cur->nd_opt_type; | |
175 | do { | |
176 | cur = ((void *)cur) + (cur->nd_opt_len << 3); | |
177 | } while(cur < end && cur->nd_opt_type != type); | |
a02cec21 | 178 | return cur <= end && cur->nd_opt_type == type ? cur : NULL; |
1da177e4 LT |
179 | } |
180 | ||
31910575 PY |
181 | static inline int ndisc_is_useropt(struct nd_opt_hdr *opt) |
182 | { | |
e35f30c1 AF |
183 | return opt->nd_opt_type == ND_OPT_RDNSS || |
184 | opt->nd_opt_type == ND_OPT_DNSSL; | |
31910575 PY |
185 | } |
186 | ||
187 | static struct nd_opt_hdr *ndisc_next_useropt(struct nd_opt_hdr *cur, | |
188 | struct nd_opt_hdr *end) | |
189 | { | |
190 | if (!cur || !end || cur >= end) | |
191 | return NULL; | |
192 | do { | |
193 | cur = ((void *)cur) + (cur->nd_opt_len << 3); | |
194 | } while(cur < end && !ndisc_is_useropt(cur)); | |
a02cec21 | 195 | return cur <= end && ndisc_is_useropt(cur) ? cur : NULL; |
31910575 PY |
196 | } |
197 | ||
30f2a5f3 DM |
198 | struct ndisc_options *ndisc_parse_options(u8 *opt, int opt_len, |
199 | struct ndisc_options *ndopts) | |
1da177e4 LT |
200 | { |
201 | struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)opt; | |
202 | ||
203 | if (!nd_opt || opt_len < 0 || !ndopts) | |
204 | return NULL; | |
205 | memset(ndopts, 0, sizeof(*ndopts)); | |
206 | while (opt_len) { | |
207 | int l; | |
208 | if (opt_len < sizeof(struct nd_opt_hdr)) | |
209 | return NULL; | |
210 | l = nd_opt->nd_opt_len << 3; | |
211 | if (opt_len < l || l == 0) | |
212 | return NULL; | |
213 | switch (nd_opt->nd_opt_type) { | |
214 | case ND_OPT_SOURCE_LL_ADDR: | |
215 | case ND_OPT_TARGET_LL_ADDR: | |
216 | case ND_OPT_MTU: | |
217 | case ND_OPT_REDIRECT_HDR: | |
218 | if (ndopts->nd_opt_array[nd_opt->nd_opt_type]) { | |
675418d5 JP |
219 | ND_PRINTK(2, warn, |
220 | "%s: duplicated ND6 option found: type=%d\n", | |
221 | __func__, nd_opt->nd_opt_type); | |
1da177e4 LT |
222 | } else { |
223 | ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt; | |
224 | } | |
225 | break; | |
226 | case ND_OPT_PREFIX_INFO: | |
227 | ndopts->nd_opts_pi_end = nd_opt; | |
cfcabdcc | 228 | if (!ndopts->nd_opt_array[nd_opt->nd_opt_type]) |
1da177e4 LT |
229 | ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt; |
230 | break; | |
70ceb4f5 YH |
231 | #ifdef CONFIG_IPV6_ROUTE_INFO |
232 | case ND_OPT_ROUTE_INFO: | |
233 | ndopts->nd_opts_ri_end = nd_opt; | |
234 | if (!ndopts->nd_opts_ri) | |
235 | ndopts->nd_opts_ri = nd_opt; | |
236 | break; | |
237 | #endif | |
1da177e4 | 238 | default: |
31910575 PY |
239 | if (ndisc_is_useropt(nd_opt)) { |
240 | ndopts->nd_useropts_end = nd_opt; | |
241 | if (!ndopts->nd_useropts) | |
242 | ndopts->nd_useropts = nd_opt; | |
243 | } else { | |
244 | /* | |
245 | * Unknown options must be silently ignored, | |
246 | * to accommodate future extension to the | |
247 | * protocol. | |
248 | */ | |
675418d5 JP |
249 | ND_PRINTK(2, notice, |
250 | "%s: ignored unsupported option; type=%d, len=%d\n", | |
251 | __func__, | |
252 | nd_opt->nd_opt_type, | |
253 | nd_opt->nd_opt_len); | |
31910575 | 254 | } |
1da177e4 LT |
255 | } |
256 | opt_len -= l; | |
257 | nd_opt = ((void *)nd_opt) + l; | |
258 | } | |
259 | return ndopts; | |
260 | } | |
261 | ||
b71d1d42 | 262 | int ndisc_mc_map(const struct in6_addr *addr, char *buf, struct net_device *dev, int dir) |
1da177e4 LT |
263 | { |
264 | switch (dev->type) { | |
265 | case ARPHRD_ETHER: | |
266 | case ARPHRD_IEEE802: /* Not sure. Check it later. --ANK */ | |
267 | case ARPHRD_FDDI: | |
268 | ipv6_eth_mc_map(addr, buf); | |
269 | return 0; | |
1da177e4 LT |
270 | case ARPHRD_ARCNET: |
271 | ipv6_arcnet_mc_map(addr, buf); | |
272 | return 0; | |
273 | case ARPHRD_INFINIBAND: | |
a9e527e3 | 274 | ipv6_ib_mc_map(addr, dev->broadcast, buf); |
1da177e4 | 275 | return 0; |
93ca3bb5 TT |
276 | case ARPHRD_IPGRE: |
277 | return ipv6_ipgre_mc_map(addr, dev->broadcast, buf); | |
1da177e4 LT |
278 | default: |
279 | if (dir) { | |
280 | memcpy(buf, dev->broadcast, dev->addr_len); | |
281 | return 0; | |
282 | } | |
283 | } | |
284 | return -EINVAL; | |
285 | } | |
286 | ||
7159039a YH |
287 | EXPORT_SYMBOL(ndisc_mc_map); |
288 | ||
d6bf7817 ED |
289 | static u32 ndisc_hash(const void *pkey, |
290 | const struct net_device *dev, | |
2c2aba6c | 291 | __u32 *hash_rnd) |
1da177e4 | 292 | { |
2c2aba6c | 293 | return ndisc_hashfn(pkey, dev, hash_rnd); |
1da177e4 LT |
294 | } |
295 | ||
296 | static int ndisc_constructor(struct neighbour *neigh) | |
297 | { | |
298 | struct in6_addr *addr = (struct in6_addr*)&neigh->primary_key; | |
299 | struct net_device *dev = neigh->dev; | |
300 | struct inet6_dev *in6_dev; | |
301 | struct neigh_parms *parms; | |
a50feda5 | 302 | bool is_multicast = ipv6_addr_is_multicast(addr); |
1da177e4 | 303 | |
1da177e4 LT |
304 | in6_dev = in6_dev_get(dev); |
305 | if (in6_dev == NULL) { | |
1da177e4 LT |
306 | return -EINVAL; |
307 | } | |
308 | ||
309 | parms = in6_dev->nd_parms; | |
310 | __neigh_parms_put(neigh->parms); | |
311 | neigh->parms = neigh_parms_clone(parms); | |
1da177e4 LT |
312 | |
313 | neigh->type = is_multicast ? RTN_MULTICAST : RTN_UNICAST; | |
3b04ddde | 314 | if (!dev->header_ops) { |
1da177e4 LT |
315 | neigh->nud_state = NUD_NOARP; |
316 | neigh->ops = &ndisc_direct_ops; | |
8f40b161 | 317 | neigh->output = neigh_direct_output; |
1da177e4 LT |
318 | } else { |
319 | if (is_multicast) { | |
320 | neigh->nud_state = NUD_NOARP; | |
321 | ndisc_mc_map(addr, neigh->ha, dev, 1); | |
322 | } else if (dev->flags&(IFF_NOARP|IFF_LOOPBACK)) { | |
323 | neigh->nud_state = NUD_NOARP; | |
324 | memcpy(neigh->ha, dev->dev_addr, dev->addr_len); | |
325 | if (dev->flags&IFF_LOOPBACK) | |
326 | neigh->type = RTN_LOCAL; | |
327 | } else if (dev->flags&IFF_POINTOPOINT) { | |
328 | neigh->nud_state = NUD_NOARP; | |
329 | memcpy(neigh->ha, dev->broadcast, dev->addr_len); | |
330 | } | |
3b04ddde | 331 | if (dev->header_ops->cache) |
1da177e4 LT |
332 | neigh->ops = &ndisc_hh_ops; |
333 | else | |
334 | neigh->ops = &ndisc_generic_ops; | |
335 | if (neigh->nud_state&NUD_VALID) | |
336 | neigh->output = neigh->ops->connected_output; | |
337 | else | |
338 | neigh->output = neigh->ops->output; | |
339 | } | |
340 | in6_dev_put(in6_dev); | |
341 | return 0; | |
342 | } | |
343 | ||
344 | static int pndisc_constructor(struct pneigh_entry *n) | |
345 | { | |
346 | struct in6_addr *addr = (struct in6_addr*)&n->key; | |
347 | struct in6_addr maddr; | |
348 | struct net_device *dev = n->dev; | |
349 | ||
350 | if (dev == NULL || __in6_dev_get(dev) == NULL) | |
351 | return -EINVAL; | |
352 | addrconf_addr_solict_mult(addr, &maddr); | |
353 | ipv6_dev_mc_inc(dev, &maddr); | |
354 | return 0; | |
355 | } | |
356 | ||
357 | static void pndisc_destructor(struct pneigh_entry *n) | |
358 | { | |
359 | struct in6_addr *addr = (struct in6_addr*)&n->key; | |
360 | struct in6_addr maddr; | |
361 | struct net_device *dev = n->dev; | |
362 | ||
363 | if (dev == NULL || __in6_dev_get(dev) == NULL) | |
364 | return; | |
365 | addrconf_addr_solict_mult(addr, &maddr); | |
366 | ipv6_dev_mc_dec(dev, &maddr); | |
367 | } | |
368 | ||
de09334b YH |
369 | static struct sk_buff *ndisc_alloc_skb(struct net_device *dev, |
370 | int len) | |
371 | { | |
372 | int hlen = LL_RESERVED_SPACE(dev); | |
373 | int tlen = dev->needed_tailroom; | |
374 | struct sock *sk = dev_net(dev)->ipv6.ndisc_sk; | |
375 | struct sk_buff *skb; | |
376 | int err; | |
377 | ||
378 | skb = sock_alloc_send_skb(sk, | |
379 | hlen + sizeof(struct ipv6hdr) + len + tlen, | |
380 | 1, &err); | |
381 | if (!skb) { | |
382 | ND_PRINTK(0, err, "ndisc: %s failed to allocate an skb, err=%d\n", | |
383 | __func__, err); | |
384 | return NULL; | |
385 | } | |
386 | ||
f382d03a YH |
387 | skb->protocol = htons(ETH_P_IPV6); |
388 | skb->dev = dev; | |
389 | ||
de09334b YH |
390 | skb_reserve(skb, hlen); |
391 | ||
392 | return skb; | |
393 | } | |
394 | ||
f382d03a | 395 | static void ip6_nd_hdr(struct sk_buff *skb, |
2576f17d YH |
396 | const struct in6_addr *saddr, |
397 | const struct in6_addr *daddr, | |
c8d6c380 | 398 | int hop_limit, int len) |
2576f17d YH |
399 | { |
400 | struct ipv6hdr *hdr; | |
401 | ||
2576f17d YH |
402 | skb_reset_network_header(skb); |
403 | skb_put(skb, sizeof(struct ipv6hdr)); | |
404 | hdr = ipv6_hdr(skb); | |
405 | ||
406 | ip6_flow_hdr(hdr, 0, 0); | |
407 | ||
408 | hdr->payload_len = htons(len); | |
c8d6c380 YH |
409 | hdr->nexthdr = IPPROTO_ICMPV6; |
410 | hdr->hop_limit = hop_limit; | |
2576f17d YH |
411 | |
412 | hdr->saddr = *saddr; | |
413 | hdr->daddr = *daddr; | |
414 | } | |
415 | ||
fd0ea7db YH |
416 | static struct sk_buff *ndisc_build_skb(struct net_device *dev, |
417 | const struct in6_addr *daddr, | |
418 | const struct in6_addr *saddr, | |
419 | struct icmp6hdr *icmp6h, | |
420 | const struct in6_addr *target, | |
421 | int llinfo) | |
1da177e4 | 422 | { |
c346dca1 | 423 | struct net *net = dev_net(dev); |
1762f7e8 | 424 | struct sock *sk = net->ipv6.ndisc_sk; |
1ab1457c | 425 | struct sk_buff *skb; |
e1ec7842 | 426 | struct icmp6hdr *hdr; |
e1ec7842 | 427 | int len; |
305d552a | 428 | u8 *opt; |
1da177e4 | 429 | |
e1ec7842 YH |
430 | if (!dev->addr_len) |
431 | llinfo = 0; | |
432 | ||
433 | len = sizeof(struct icmp6hdr) + (target ? sizeof(*target) : 0); | |
434 | if (llinfo) | |
435 | len += ndisc_opt_addr_space(dev); | |
1da177e4 | 436 | |
de09334b YH |
437 | skb = ndisc_alloc_skb(dev, len); |
438 | if (!skb) | |
305d552a | 439 | return NULL; |
1da177e4 | 440 | |
f382d03a | 441 | ip6_nd_hdr(skb, saddr, daddr, inet6_sk(sk)->hop_limit, len); |
1da177e4 | 442 | |
27a884dc | 443 | skb->transport_header = skb->tail; |
d10ba34b | 444 | skb_put(skb, len); |
1da177e4 | 445 | |
e1ec7842 YH |
446 | hdr = (struct icmp6hdr *)skb_transport_header(skb); |
447 | memcpy(hdr, icmp6h, sizeof(*hdr)); | |
1da177e4 | 448 | |
e1ec7842 YH |
449 | opt = skb_transport_header(skb) + sizeof(struct icmp6hdr); |
450 | if (target) { | |
4e3fd7a0 | 451 | *(struct in6_addr *)opt = *target; |
e1ec7842 YH |
452 | opt += sizeof(*target); |
453 | } | |
1da177e4 | 454 | |
e1ec7842 | 455 | if (llinfo) |
315ff09d | 456 | ndisc_fill_addr_option(opt, llinfo, dev->dev_addr, dev); |
1da177e4 | 457 | |
e1ec7842 YH |
458 | hdr->icmp6_cksum = csum_ipv6_magic(saddr, daddr, len, |
459 | IPPROTO_ICMPV6, | |
07f0757a | 460 | csum_partial(hdr, |
e1ec7842 | 461 | len, 0)); |
1da177e4 | 462 | |
305d552a BH |
463 | return skb; |
464 | } | |
465 | ||
fd0ea7db | 466 | static void ndisc_send_skb(struct sk_buff *skb, struct net_device *dev, |
fd0ea7db YH |
467 | const struct in6_addr *daddr, |
468 | const struct in6_addr *saddr, | |
469 | struct icmp6hdr *icmp6h) | |
305d552a | 470 | { |
4c9483b2 | 471 | struct flowi6 fl6; |
305d552a BH |
472 | struct dst_entry *dst; |
473 | struct net *net = dev_net(dev); | |
474 | struct sock *sk = net->ipv6.ndisc_sk; | |
475 | struct inet6_dev *idev; | |
476 | int err; | |
477 | u8 type; | |
478 | ||
479 | type = icmp6h->icmp6_type; | |
480 | ||
4c9483b2 | 481 | icmpv6_flow_init(sk, &fl6, type, saddr, daddr, dev->ifindex); |
12fd84f4 | 482 | dst = icmp6_dst_alloc(dev, &fl6); |
452edd59 | 483 | if (IS_ERR(dst)) { |
305d552a BH |
484 | kfree_skb(skb); |
485 | return; | |
486 | } | |
487 | ||
adf30907 | 488 | skb_dst_set(skb, dst); |
e1ec7842 | 489 | |
cfdf7647 ED |
490 | rcu_read_lock(); |
491 | idev = __in6_dev_get(dst->dev); | |
edf391ff | 492 | IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len); |
e1ec7842 | 493 | |
b2e0b385 | 494 | err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, dst->dev, |
6e23ae2a | 495 | dst_output); |
1da177e4 | 496 | if (!err) { |
5c5d244b | 497 | ICMP6MSGOUT_INC_STATS(net, idev, type); |
a862f6a6 | 498 | ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); |
1da177e4 LT |
499 | } |
500 | ||
cfdf7647 | 501 | rcu_read_unlock(); |
1ab1457c | 502 | } |
1da177e4 | 503 | |
305d552a BH |
504 | /* |
505 | * Send a Neighbour Discover packet | |
506 | */ | |
507 | static void __ndisc_send(struct net_device *dev, | |
305d552a BH |
508 | const struct in6_addr *daddr, |
509 | const struct in6_addr *saddr, | |
510 | struct icmp6hdr *icmp6h, const struct in6_addr *target, | |
511 | int llinfo) | |
512 | { | |
513 | struct sk_buff *skb; | |
514 | ||
515 | skb = ndisc_build_skb(dev, daddr, saddr, icmp6h, target, llinfo); | |
516 | if (!skb) | |
517 | return; | |
518 | ||
12fd84f4 | 519 | ndisc_send_skb(skb, dev, daddr, saddr, icmp6h); |
305d552a BH |
520 | } |
521 | ||
e1ec7842 | 522 | static void ndisc_send_na(struct net_device *dev, struct neighbour *neigh, |
9acd9f3a YH |
523 | const struct in6_addr *daddr, |
524 | const struct in6_addr *solicited_addr, | |
fb568637 | 525 | bool router, bool solicited, bool override, bool inc_opt) |
e1ec7842 YH |
526 | { |
527 | struct in6_addr tmpaddr; | |
528 | struct inet6_ifaddr *ifp; | |
9acd9f3a | 529 | const struct in6_addr *src_addr; |
e1ec7842 YH |
530 | struct icmp6hdr icmp6h = { |
531 | .icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT, | |
532 | }; | |
533 | ||
534 | /* for anycast or proxy, solicited_addr != src_addr */ | |
c346dca1 | 535 | ifp = ipv6_get_ifaddr(dev_net(dev), solicited_addr, dev, 1); |
e1ec7842 YH |
536 | if (ifp) { |
537 | src_addr = solicited_addr; | |
538 | if (ifp->flags & IFA_F_OPTIMISTIC) | |
539 | override = 0; | |
9f888160 | 540 | inc_opt |= ifp->idev->cnf.force_tllao; |
e1ec7842 YH |
541 | in6_ifa_put(ifp); |
542 | } else { | |
191cd582 | 543 | if (ipv6_dev_get_saddr(dev_net(dev), dev, daddr, |
c346dca1 | 544 | inet6_sk(dev_net(dev)->ipv6.ndisc_sk)->srcprefs, |
7cbca67c | 545 | &tmpaddr)) |
e1ec7842 YH |
546 | return; |
547 | src_addr = &tmpaddr; | |
548 | } | |
549 | ||
550 | icmp6h.icmp6_router = router; | |
551 | icmp6h.icmp6_solicited = solicited; | |
552 | icmp6h.icmp6_override = override; | |
553 | ||
12fd84f4 | 554 | __ndisc_send(dev, daddr, src_addr, &icmp6h, solicited_addr, |
14878f75 | 555 | inc_opt ? ND_OPT_TARGET_LL_ADDR : 0); |
e1ec7842 YH |
556 | } |
557 | ||
f47b9464 BH |
558 | static void ndisc_send_unsol_na(struct net_device *dev) |
559 | { | |
560 | struct inet6_dev *idev; | |
561 | struct inet6_ifaddr *ifa; | |
f47b9464 BH |
562 | |
563 | idev = in6_dev_get(dev); | |
564 | if (!idev) | |
565 | return; | |
566 | ||
567 | read_lock_bh(&idev->lock); | |
568 | list_for_each_entry(ifa, &idev->addr_list, if_list) { | |
9fafd65a | 569 | ndisc_send_na(dev, NULL, &in6addr_linklocal_allnodes, &ifa->addr, |
f47b9464 BH |
570 | /*router=*/ !!idev->cnf.forwarding, |
571 | /*solicited=*/ false, /*override=*/ true, | |
572 | /*inc_opt=*/ true); | |
573 | } | |
574 | read_unlock_bh(&idev->lock); | |
575 | ||
576 | in6_dev_put(idev); | |
577 | } | |
578 | ||
1da177e4 | 579 | void ndisc_send_ns(struct net_device *dev, struct neighbour *neigh, |
9acd9f3a YH |
580 | const struct in6_addr *solicit, |
581 | const struct in6_addr *daddr, const struct in6_addr *saddr) | |
1da177e4 | 582 | { |
1da177e4 | 583 | struct in6_addr addr_buf; |
e1ec7842 YH |
584 | struct icmp6hdr icmp6h = { |
585 | .icmp6_type = NDISC_NEIGHBOUR_SOLICITATION, | |
586 | }; | |
1da177e4 LT |
587 | |
588 | if (saddr == NULL) { | |
95c385b4 NH |
589 | if (ipv6_get_lladdr(dev, &addr_buf, |
590 | (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC))) | |
1da177e4 LT |
591 | return; |
592 | saddr = &addr_buf; | |
593 | } | |
594 | ||
12fd84f4 | 595 | __ndisc_send(dev, daddr, saddr, &icmp6h, solicit, |
14878f75 | 596 | !ipv6_addr_any(saddr) ? ND_OPT_SOURCE_LL_ADDR : 0); |
1da177e4 LT |
597 | } |
598 | ||
9acd9f3a YH |
599 | void ndisc_send_rs(struct net_device *dev, const struct in6_addr *saddr, |
600 | const struct in6_addr *daddr) | |
1da177e4 | 601 | { |
e1ec7842 YH |
602 | struct icmp6hdr icmp6h = { |
603 | .icmp6_type = NDISC_ROUTER_SOLICITATION, | |
604 | }; | |
95c385b4 | 605 | int send_sllao = dev->addr_len; |
95c385b4 NH |
606 | |
607 | #ifdef CONFIG_IPV6_OPTIMISTIC_DAD | |
608 | /* | |
609 | * According to section 2.2 of RFC 4429, we must not | |
610 | * send router solicitations with a sllao from | |
611 | * optimistic addresses, but we may send the solicitation | |
612 | * if we don't include the sllao. So here we check | |
613 | * if our address is optimistic, and if so, we | |
bea85195 | 614 | * suppress the inclusion of the sllao. |
95c385b4 NH |
615 | */ |
616 | if (send_sllao) { | |
c346dca1 | 617 | struct inet6_ifaddr *ifp = ipv6_get_ifaddr(dev_net(dev), saddr, |
1cab3da6 | 618 | dev, 1); |
95c385b4 NH |
619 | if (ifp) { |
620 | if (ifp->flags & IFA_F_OPTIMISTIC) { | |
ca043569 | 621 | send_sllao = 0; |
95c385b4 | 622 | } |
ca043569 | 623 | in6_ifa_put(ifp); |
95c385b4 NH |
624 | } else { |
625 | send_sllao = 0; | |
626 | } | |
627 | } | |
628 | #endif | |
12fd84f4 | 629 | __ndisc_send(dev, daddr, saddr, &icmp6h, NULL, |
14878f75 | 630 | send_sllao ? ND_OPT_SOURCE_LL_ADDR : 0); |
1da177e4 | 631 | } |
1ab1457c | 632 | |
1da177e4 LT |
633 | |
634 | static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb) | |
635 | { | |
636 | /* | |
637 | * "The sender MUST return an ICMP | |
638 | * destination unreachable" | |
639 | */ | |
640 | dst_link_failure(skb); | |
641 | kfree_skb(skb); | |
642 | } | |
643 | ||
644 | /* Called with locked neigh: either read or both */ | |
645 | ||
646 | static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb) | |
647 | { | |
648 | struct in6_addr *saddr = NULL; | |
649 | struct in6_addr mcaddr; | |
650 | struct net_device *dev = neigh->dev; | |
651 | struct in6_addr *target = (struct in6_addr *)&neigh->primary_key; | |
652 | int probes = atomic_read(&neigh->probes); | |
653 | ||
c346dca1 | 654 | if (skb && ipv6_chk_addr(dev_net(dev), &ipv6_hdr(skb)->saddr, dev, 1)) |
0660e03f | 655 | saddr = &ipv6_hdr(skb)->saddr; |
1da177e4 LT |
656 | |
657 | if ((probes -= neigh->parms->ucast_probes) < 0) { | |
658 | if (!(neigh->nud_state & NUD_VALID)) { | |
675418d5 JP |
659 | ND_PRINTK(1, dbg, |
660 | "%s: trying to ucast probe in NUD_INVALID: %pI6\n", | |
661 | __func__, target); | |
1da177e4 LT |
662 | } |
663 | ndisc_send_ns(dev, neigh, target, target, saddr); | |
664 | } else if ((probes -= neigh->parms->app_probes) < 0) { | |
665 | #ifdef CONFIG_ARPD | |
666 | neigh_app_ns(neigh); | |
667 | #endif | |
668 | } else { | |
669 | addrconf_addr_solict_mult(target, &mcaddr); | |
670 | ndisc_send_ns(dev, NULL, target, &mcaddr, saddr); | |
671 | } | |
672 | } | |
673 | ||
0736ffc0 YH |
674 | static int pndisc_is_router(const void *pkey, |
675 | struct net_device *dev) | |
fa86d322 PE |
676 | { |
677 | struct pneigh_entry *n; | |
0736ffc0 | 678 | int ret = -1; |
fa86d322 PE |
679 | |
680 | read_lock_bh(&nd_tbl.lock); | |
0736ffc0 YH |
681 | n = __pneigh_lookup(&nd_tbl, dev_net(dev), pkey, dev); |
682 | if (n) | |
683 | ret = !!(n->flags & NTF_ROUTER); | |
fa86d322 PE |
684 | read_unlock_bh(&nd_tbl.lock); |
685 | ||
0736ffc0 | 686 | return ret; |
fa86d322 PE |
687 | } |
688 | ||
1da177e4 LT |
689 | static void ndisc_recv_ns(struct sk_buff *skb) |
690 | { | |
9c70220b | 691 | struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb); |
b71d1d42 ED |
692 | const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; |
693 | const struct in6_addr *daddr = &ipv6_hdr(skb)->daddr; | |
1da177e4 | 694 | u8 *lladdr = NULL; |
27a884dc ACM |
695 | u32 ndoptlen = skb->tail - (skb->transport_header + |
696 | offsetof(struct nd_msg, opt)); | |
1da177e4 LT |
697 | struct ndisc_options ndopts; |
698 | struct net_device *dev = skb->dev; | |
699 | struct inet6_ifaddr *ifp; | |
700 | struct inet6_dev *idev = NULL; | |
701 | struct neighbour *neigh; | |
702 | int dad = ipv6_addr_any(saddr); | |
a50feda5 | 703 | bool inc; |
0736ffc0 | 704 | int is_router = -1; |
1da177e4 | 705 | |
115b0aa6 YH |
706 | if (skb->len < sizeof(struct nd_msg)) { |
707 | ND_PRINTK(2, warn, "NS: packet too short\n"); | |
708 | return; | |
709 | } | |
710 | ||
1da177e4 | 711 | if (ipv6_addr_is_multicast(&msg->target)) { |
675418d5 | 712 | ND_PRINTK(2, warn, "NS: multicast target address\n"); |
1da177e4 LT |
713 | return; |
714 | } | |
715 | ||
716 | /* | |
717 | * RFC2461 7.1.1: | |
718 | * DAD has to be destined for solicited node multicast address. | |
719 | */ | |
ca97a644 | 720 | if (dad && !ipv6_addr_is_solict_mult(daddr)) { |
675418d5 | 721 | ND_PRINTK(2, warn, "NS: bad DAD packet (wrong destination)\n"); |
1da177e4 LT |
722 | return; |
723 | } | |
724 | ||
725 | if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) { | |
675418d5 | 726 | ND_PRINTK(2, warn, "NS: invalid ND options\n"); |
1da177e4 LT |
727 | return; |
728 | } | |
729 | ||
730 | if (ndopts.nd_opts_src_lladdr) { | |
731 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, dev); | |
732 | if (!lladdr) { | |
675418d5 JP |
733 | ND_PRINTK(2, warn, |
734 | "NS: invalid link-layer address length\n"); | |
1da177e4 LT |
735 | return; |
736 | } | |
737 | ||
738 | /* RFC2461 7.1.1: | |
1ab1457c YH |
739 | * If the IP source address is the unspecified address, |
740 | * there MUST NOT be source link-layer address option | |
1da177e4 LT |
741 | * in the message. |
742 | */ | |
743 | if (dad) { | |
675418d5 JP |
744 | ND_PRINTK(2, warn, |
745 | "NS: bad DAD packet (link-layer address option)\n"); | |
1da177e4 LT |
746 | return; |
747 | } | |
748 | } | |
749 | ||
750 | inc = ipv6_addr_is_multicast(daddr); | |
751 | ||
c346dca1 | 752 | ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1); |
a18bc695 | 753 | if (ifp) { |
95c385b4 NH |
754 | |
755 | if (ifp->flags & (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC)) { | |
756 | if (dad) { | |
95c385b4 NH |
757 | /* |
758 | * We are colliding with another node | |
759 | * who is doing DAD | |
760 | * so fail our DAD process | |
761 | */ | |
762 | addrconf_dad_failure(ifp); | |
9e3be4b3 | 763 | return; |
95c385b4 NH |
764 | } else { |
765 | /* | |
766 | * This is not a dad solicitation. | |
767 | * If we are an optimistic node, | |
768 | * we should respond. | |
769 | * Otherwise, we should ignore it. | |
770 | */ | |
771 | if (!(ifp->flags & IFA_F_OPTIMISTIC)) | |
1da177e4 | 772 | goto out; |
1da177e4 | 773 | } |
1da177e4 LT |
774 | } |
775 | ||
776 | idev = ifp->idev; | |
777 | } else { | |
53b7997f YH |
778 | struct net *net = dev_net(dev); |
779 | ||
1da177e4 LT |
780 | idev = in6_dev_get(dev); |
781 | if (!idev) { | |
782 | /* XXX: count this drop? */ | |
783 | return; | |
784 | } | |
785 | ||
53b7997f | 786 | if (ipv6_chk_acast_addr(net, dev, &msg->target) || |
1ab1457c | 787 | (idev->cnf.forwarding && |
53b7997f | 788 | (net->ipv6.devconf_all->proxy_ndp || idev->cnf.proxy_ndp) && |
0736ffc0 | 789 | (is_router = pndisc_is_router(&msg->target, dev)) >= 0)) { |
a61bbcf2 | 790 | if (!(NEIGH_CB(skb)->flags & LOCALLY_ENQUEUED) && |
1da177e4 LT |
791 | skb->pkt_type != PACKET_HOST && |
792 | inc != 0 && | |
793 | idev->nd_parms->proxy_delay != 0) { | |
794 | /* | |
795 | * for anycast or proxy, | |
1ab1457c YH |
796 | * sender should delay its response |
797 | * by a random time between 0 and | |
1da177e4 LT |
798 | * MAX_ANYCAST_DELAY_TIME seconds. |
799 | * (RFC2461) -- yoshfuji | |
800 | */ | |
801 | struct sk_buff *n = skb_clone(skb, GFP_ATOMIC); | |
802 | if (n) | |
803 | pneigh_enqueue(&nd_tbl, idev->nd_parms, n); | |
804 | goto out; | |
805 | } | |
806 | } else | |
807 | goto out; | |
808 | } | |
809 | ||
0736ffc0 | 810 | if (is_router < 0) |
fb568637 | 811 | is_router = idev->cnf.forwarding; |
62dd9318 | 812 | |
1da177e4 | 813 | if (dad) { |
f3ee4010 | 814 | ndisc_send_na(dev, NULL, &in6addr_linklocal_allnodes, &msg->target, |
fb568637 | 815 | !!is_router, false, (ifp != NULL), true); |
1da177e4 LT |
816 | goto out; |
817 | } | |
818 | ||
819 | if (inc) | |
820 | NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_mcast); | |
821 | else | |
822 | NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_ucast); | |
823 | ||
1ab1457c | 824 | /* |
1da177e4 LT |
825 | * update / create cache entry |
826 | * for the source address | |
827 | */ | |
828 | neigh = __neigh_lookup(&nd_tbl, saddr, dev, | |
829 | !inc || lladdr || !dev->addr_len); | |
830 | if (neigh) | |
1ab1457c | 831 | neigh_update(neigh, lladdr, NUD_STALE, |
1da177e4 LT |
832 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
833 | NEIGH_UPDATE_F_OVERRIDE); | |
3b04ddde | 834 | if (neigh || !dev->header_ops) { |
1da177e4 | 835 | ndisc_send_na(dev, neigh, saddr, &msg->target, |
fb568637 YH |
836 | !!is_router, |
837 | true, (ifp != NULL && inc), inc); | |
1da177e4 LT |
838 | if (neigh) |
839 | neigh_release(neigh); | |
840 | } | |
841 | ||
842 | out: | |
843 | if (ifp) | |
844 | in6_ifa_put(ifp); | |
845 | else | |
846 | in6_dev_put(idev); | |
1da177e4 LT |
847 | } |
848 | ||
849 | static void ndisc_recv_na(struct sk_buff *skb) | |
850 | { | |
9c70220b | 851 | struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb); |
b71d1d42 ED |
852 | const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; |
853 | const struct in6_addr *daddr = &ipv6_hdr(skb)->daddr; | |
1da177e4 | 854 | u8 *lladdr = NULL; |
27a884dc ACM |
855 | u32 ndoptlen = skb->tail - (skb->transport_header + |
856 | offsetof(struct nd_msg, opt)); | |
1da177e4 LT |
857 | struct ndisc_options ndopts; |
858 | struct net_device *dev = skb->dev; | |
859 | struct inet6_ifaddr *ifp; | |
860 | struct neighbour *neigh; | |
861 | ||
862 | if (skb->len < sizeof(struct nd_msg)) { | |
675418d5 | 863 | ND_PRINTK(2, warn, "NA: packet too short\n"); |
1da177e4 LT |
864 | return; |
865 | } | |
866 | ||
867 | if (ipv6_addr_is_multicast(&msg->target)) { | |
675418d5 | 868 | ND_PRINTK(2, warn, "NA: target address is multicast\n"); |
1da177e4 LT |
869 | return; |
870 | } | |
871 | ||
872 | if (ipv6_addr_is_multicast(daddr) && | |
873 | msg->icmph.icmp6_solicited) { | |
675418d5 | 874 | ND_PRINTK(2, warn, "NA: solicited NA is multicasted\n"); |
1da177e4 LT |
875 | return; |
876 | } | |
1ab1457c | 877 | |
1da177e4 | 878 | if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) { |
675418d5 | 879 | ND_PRINTK(2, warn, "NS: invalid ND option\n"); |
1da177e4 LT |
880 | return; |
881 | } | |
882 | if (ndopts.nd_opts_tgt_lladdr) { | |
883 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, dev); | |
884 | if (!lladdr) { | |
675418d5 JP |
885 | ND_PRINTK(2, warn, |
886 | "NA: invalid link-layer address length\n"); | |
1da177e4 LT |
887 | return; |
888 | } | |
889 | } | |
c346dca1 | 890 | ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1); |
a18bc695 | 891 | if (ifp) { |
bd015928 DW |
892 | if (skb->pkt_type != PACKET_LOOPBACK |
893 | && (ifp->flags & IFA_F_TENTATIVE)) { | |
894 | addrconf_dad_failure(ifp); | |
895 | return; | |
1da177e4 LT |
896 | } |
897 | /* What should we make now? The advertisement | |
898 | is invalid, but ndisc specs say nothing | |
899 | about it. It could be misconfiguration, or | |
900 | an smart proxy agent tries to help us :-) | |
24fc7b86 JS |
901 | |
902 | We should not print the error if NA has been | |
903 | received from loopback - it is just our own | |
904 | unsolicited advertisement. | |
1da177e4 | 905 | */ |
24fc7b86 | 906 | if (skb->pkt_type != PACKET_LOOPBACK) |
675418d5 JP |
907 | ND_PRINTK(1, warn, |
908 | "NA: someone advertises our address %pI6 on %s!\n", | |
909 | &ifp->addr, ifp->idev->dev->name); | |
1da177e4 LT |
910 | in6_ifa_put(ifp); |
911 | return; | |
912 | } | |
913 | neigh = neigh_lookup(&nd_tbl, &msg->target, dev); | |
914 | ||
915 | if (neigh) { | |
916 | u8 old_flags = neigh->flags; | |
53b7997f | 917 | struct net *net = dev_net(dev); |
1da177e4 LT |
918 | |
919 | if (neigh->nud_state & NUD_FAILED) | |
920 | goto out; | |
921 | ||
5f3e6e9e VN |
922 | /* |
923 | * Don't update the neighbor cache entry on a proxy NA from | |
924 | * ourselves because either the proxied node is off link or it | |
925 | * has already sent a NA to us. | |
926 | */ | |
927 | if (lladdr && !memcmp(lladdr, dev->dev_addr, dev->addr_len) && | |
53b7997f YH |
928 | net->ipv6.devconf_all->forwarding && net->ipv6.devconf_all->proxy_ndp && |
929 | pneigh_lookup(&nd_tbl, net, &msg->target, dev, 0)) { | |
b20b6d97 | 930 | /* XXX: idev->cnf.proxy_ndp */ |
5f3e6e9e | 931 | goto out; |
fbea49e1 | 932 | } |
5f3e6e9e | 933 | |
1da177e4 LT |
934 | neigh_update(neigh, lladdr, |
935 | msg->icmph.icmp6_solicited ? NUD_REACHABLE : NUD_STALE, | |
936 | NEIGH_UPDATE_F_WEAK_OVERRIDE| | |
937 | (msg->icmph.icmp6_override ? NEIGH_UPDATE_F_OVERRIDE : 0)| | |
938 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
939 | (msg->icmph.icmp6_router ? NEIGH_UPDATE_F_ISROUTER : 0)); | |
940 | ||
941 | if ((old_flags & ~neigh->flags) & NTF_ROUTER) { | |
942 | /* | |
943 | * Change: router to host | |
944 | */ | |
945 | struct rt6_info *rt; | |
946 | rt = rt6_get_dflt_router(saddr, dev); | |
947 | if (rt) | |
e0a1ad73 | 948 | ip6_del_rt(rt); |
1da177e4 LT |
949 | } |
950 | ||
951 | out: | |
952 | neigh_release(neigh); | |
953 | } | |
954 | } | |
955 | ||
956 | static void ndisc_recv_rs(struct sk_buff *skb) | |
957 | { | |
9c70220b | 958 | struct rs_msg *rs_msg = (struct rs_msg *)skb_transport_header(skb); |
1da177e4 LT |
959 | unsigned long ndoptlen = skb->len - sizeof(*rs_msg); |
960 | struct neighbour *neigh; | |
961 | struct inet6_dev *idev; | |
b71d1d42 | 962 | const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; |
1da177e4 LT |
963 | struct ndisc_options ndopts; |
964 | u8 *lladdr = NULL; | |
965 | ||
966 | if (skb->len < sizeof(*rs_msg)) | |
967 | return; | |
968 | ||
cfdf7647 | 969 | idev = __in6_dev_get(skb->dev); |
1da177e4 | 970 | if (!idev) { |
675418d5 | 971 | ND_PRINTK(1, err, "RS: can't find in6 device\n"); |
1da177e4 LT |
972 | return; |
973 | } | |
974 | ||
975 | /* Don't accept RS if we're not in router mode */ | |
976 | if (!idev->cnf.forwarding) | |
977 | goto out; | |
978 | ||
979 | /* | |
980 | * Don't update NCE if src = ::; | |
981 | * this implies that the source node has no ip address assigned yet. | |
982 | */ | |
983 | if (ipv6_addr_any(saddr)) | |
984 | goto out; | |
985 | ||
986 | /* Parse ND options */ | |
987 | if (!ndisc_parse_options(rs_msg->opt, ndoptlen, &ndopts)) { | |
675418d5 | 988 | ND_PRINTK(2, notice, "NS: invalid ND option, ignored\n"); |
1da177e4 LT |
989 | goto out; |
990 | } | |
991 | ||
992 | if (ndopts.nd_opts_src_lladdr) { | |
993 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, | |
994 | skb->dev); | |
995 | if (!lladdr) | |
996 | goto out; | |
997 | } | |
998 | ||
999 | neigh = __neigh_lookup(&nd_tbl, saddr, skb->dev, 1); | |
1000 | if (neigh) { | |
1001 | neigh_update(neigh, lladdr, NUD_STALE, | |
1002 | NEIGH_UPDATE_F_WEAK_OVERRIDE| | |
1003 | NEIGH_UPDATE_F_OVERRIDE| | |
1004 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER); | |
1005 | neigh_release(neigh); | |
1006 | } | |
1007 | out: | |
cfdf7647 | 1008 | return; |
1da177e4 LT |
1009 | } |
1010 | ||
31910575 PY |
1011 | static void ndisc_ra_useropt(struct sk_buff *ra, struct nd_opt_hdr *opt) |
1012 | { | |
1013 | struct icmp6hdr *icmp6h = (struct icmp6hdr *)skb_transport_header(ra); | |
1014 | struct sk_buff *skb; | |
1015 | struct nlmsghdr *nlh; | |
1016 | struct nduseroptmsg *ndmsg; | |
c346dca1 | 1017 | struct net *net = dev_net(ra->dev); |
31910575 PY |
1018 | int err; |
1019 | int base_size = NLMSG_ALIGN(sizeof(struct nduseroptmsg) | |
1020 | + (opt->nd_opt_len << 3)); | |
1021 | size_t msg_size = base_size + nla_total_size(sizeof(struct in6_addr)); | |
1022 | ||
1023 | skb = nlmsg_new(msg_size, GFP_ATOMIC); | |
1024 | if (skb == NULL) { | |
1025 | err = -ENOBUFS; | |
1026 | goto errout; | |
1027 | } | |
1028 | ||
1029 | nlh = nlmsg_put(skb, 0, 0, RTM_NEWNDUSEROPT, base_size, 0); | |
1030 | if (nlh == NULL) { | |
1031 | goto nla_put_failure; | |
1032 | } | |
1033 | ||
1034 | ndmsg = nlmsg_data(nlh); | |
1035 | ndmsg->nduseropt_family = AF_INET6; | |
dbb2ed24 | 1036 | ndmsg->nduseropt_ifindex = ra->dev->ifindex; |
31910575 PY |
1037 | ndmsg->nduseropt_icmp_type = icmp6h->icmp6_type; |
1038 | ndmsg->nduseropt_icmp_code = icmp6h->icmp6_code; | |
1039 | ndmsg->nduseropt_opts_len = opt->nd_opt_len << 3; | |
1040 | ||
1041 | memcpy(ndmsg + 1, opt, opt->nd_opt_len << 3); | |
1042 | ||
c78679e8 DM |
1043 | if (nla_put(skb, NDUSEROPT_SRCADDR, sizeof(struct in6_addr), |
1044 | &ipv6_hdr(ra)->saddr)) | |
1045 | goto nla_put_failure; | |
31910575 PY |
1046 | nlmsg_end(skb, nlh); |
1047 | ||
1ce85fe4 | 1048 | rtnl_notify(skb, net, 0, RTNLGRP_ND_USEROPT, NULL, GFP_ATOMIC); |
31910575 PY |
1049 | return; |
1050 | ||
1051 | nla_put_failure: | |
1052 | nlmsg_free(skb); | |
1053 | err = -EMSGSIZE; | |
1054 | errout: | |
a18bc695 | 1055 | rtnl_set_sk_err(net, RTNLGRP_ND_USEROPT, err); |
31910575 PY |
1056 | } |
1057 | ||
1da177e4 LT |
1058 | static void ndisc_router_discovery(struct sk_buff *skb) |
1059 | { | |
9c70220b | 1060 | struct ra_msg *ra_msg = (struct ra_msg *)skb_transport_header(skb); |
1da177e4 LT |
1061 | struct neighbour *neigh = NULL; |
1062 | struct inet6_dev *in6_dev; | |
65f5c7c1 | 1063 | struct rt6_info *rt = NULL; |
1da177e4 LT |
1064 | int lifetime; |
1065 | struct ndisc_options ndopts; | |
1066 | int optlen; | |
ebacaaa0 | 1067 | unsigned int pref = 0; |
1da177e4 LT |
1068 | |
1069 | __u8 * opt = (__u8 *)(ra_msg + 1); | |
1070 | ||
27a884dc | 1071 | optlen = (skb->tail - skb->transport_header) - sizeof(struct ra_msg); |
1da177e4 | 1072 | |
0660e03f | 1073 | if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) { |
675418d5 | 1074 | ND_PRINTK(2, warn, "RA: source address is not link-local\n"); |
1da177e4 LT |
1075 | return; |
1076 | } | |
1077 | if (optlen < 0) { | |
675418d5 | 1078 | ND_PRINTK(2, warn, "RA: packet too short\n"); |
1da177e4 LT |
1079 | return; |
1080 | } | |
1081 | ||
de357cc0 | 1082 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 | 1083 | if (skb->ndisc_nodetype == NDISC_NODETYPE_HOST) { |
675418d5 | 1084 | ND_PRINTK(2, warn, "RA: from host or unauthorized router\n"); |
fadf6bf0 TF |
1085 | return; |
1086 | } | |
de357cc0 | 1087 | #endif |
fadf6bf0 | 1088 | |
1da177e4 LT |
1089 | /* |
1090 | * set the RA_RECV flag in the interface | |
1091 | */ | |
1092 | ||
cfdf7647 | 1093 | in6_dev = __in6_dev_get(skb->dev); |
1da177e4 | 1094 | if (in6_dev == NULL) { |
675418d5 JP |
1095 | ND_PRINTK(0, err, "RA: can't find inet6 device for %s\n", |
1096 | skb->dev->name); | |
1da177e4 LT |
1097 | return; |
1098 | } | |
1da177e4 LT |
1099 | |
1100 | if (!ndisc_parse_options(opt, optlen, &ndopts)) { | |
675418d5 | 1101 | ND_PRINTK(2, warn, "RA: invalid ND options\n"); |
1da177e4 LT |
1102 | return; |
1103 | } | |
1104 | ||
aeaf6e9d | 1105 | if (!ipv6_accept_ra(in6_dev)) |
31ce8c71 DW |
1106 | goto skip_linkparms; |
1107 | ||
de357cc0 | 1108 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 TF |
1109 | /* skip link-specific parameters from interior routers */ |
1110 | if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT) | |
1111 | goto skip_linkparms; | |
de357cc0 | 1112 | #endif |
fadf6bf0 | 1113 | |
1da177e4 LT |
1114 | if (in6_dev->if_flags & IF_RS_SENT) { |
1115 | /* | |
1116 | * flag that an RA was received after an RS was sent | |
1117 | * out on this interface. | |
1118 | */ | |
1119 | in6_dev->if_flags |= IF_RA_RCVD; | |
1120 | } | |
1121 | ||
1122 | /* | |
1123 | * Remember the managed/otherconf flags from most recently | |
1124 | * received RA message (RFC 2462) -- yoshfuji | |
1125 | */ | |
1126 | in6_dev->if_flags = (in6_dev->if_flags & ~(IF_RA_MANAGED | | |
1127 | IF_RA_OTHERCONF)) | | |
1128 | (ra_msg->icmph.icmp6_addrconf_managed ? | |
1129 | IF_RA_MANAGED : 0) | | |
1130 | (ra_msg->icmph.icmp6_addrconf_other ? | |
1131 | IF_RA_OTHERCONF : 0); | |
1132 | ||
65f5c7c1 YH |
1133 | if (!in6_dev->cnf.accept_ra_defrtr) |
1134 | goto skip_defrtr; | |
1135 | ||
9f56220f AH |
1136 | if (ipv6_chk_addr(dev_net(in6_dev->dev), &ipv6_hdr(skb)->saddr, NULL, 0)) |
1137 | goto skip_defrtr; | |
1138 | ||
1da177e4 LT |
1139 | lifetime = ntohs(ra_msg->icmph.icmp6_rt_lifetime); |
1140 | ||
ebacaaa0 YH |
1141 | #ifdef CONFIG_IPV6_ROUTER_PREF |
1142 | pref = ra_msg->icmph.icmp6_router_pref; | |
1143 | /* 10b is handled as if it were 00b (medium) */ | |
930d6ff2 | 1144 | if (pref == ICMPV6_ROUTER_PREF_INVALID || |
6d5b78cd | 1145 | !in6_dev->cnf.accept_ra_rtr_pref) |
ebacaaa0 YH |
1146 | pref = ICMPV6_ROUTER_PREF_MEDIUM; |
1147 | #endif | |
1148 | ||
0660e03f | 1149 | rt = rt6_get_dflt_router(&ipv6_hdr(skb)->saddr, skb->dev); |
1da177e4 | 1150 | |
eb857186 DM |
1151 | if (rt) { |
1152 | neigh = dst_neigh_lookup(&rt->dst, &ipv6_hdr(skb)->saddr); | |
1153 | if (!neigh) { | |
675418d5 JP |
1154 | ND_PRINTK(0, err, |
1155 | "RA: %s got default router without neighbour\n", | |
1156 | __func__); | |
94e187c0 | 1157 | ip6_rt_put(rt); |
eb857186 DM |
1158 | return; |
1159 | } | |
1160 | } | |
1da177e4 | 1161 | if (rt && lifetime == 0) { |
e0a1ad73 | 1162 | ip6_del_rt(rt); |
1da177e4 LT |
1163 | rt = NULL; |
1164 | } | |
1165 | ||
1166 | if (rt == NULL && lifetime) { | |
675418d5 | 1167 | ND_PRINTK(3, dbg, "RA: adding default router\n"); |
1da177e4 | 1168 | |
0660e03f | 1169 | rt = rt6_add_dflt_router(&ipv6_hdr(skb)->saddr, skb->dev, pref); |
1da177e4 | 1170 | if (rt == NULL) { |
675418d5 JP |
1171 | ND_PRINTK(0, err, |
1172 | "RA: %s failed to add default route\n", | |
1173 | __func__); | |
1da177e4 LT |
1174 | return; |
1175 | } | |
1176 | ||
eb857186 | 1177 | neigh = dst_neigh_lookup(&rt->dst, &ipv6_hdr(skb)->saddr); |
1da177e4 | 1178 | if (neigh == NULL) { |
675418d5 JP |
1179 | ND_PRINTK(0, err, |
1180 | "RA: %s got default router without neighbour\n", | |
1181 | __func__); | |
94e187c0 | 1182 | ip6_rt_put(rt); |
1da177e4 LT |
1183 | return; |
1184 | } | |
1185 | neigh->flags |= NTF_ROUTER; | |
ebacaaa0 | 1186 | } else if (rt) { |
22441cfa | 1187 | rt->rt6i_flags = (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); |
1da177e4 LT |
1188 | } |
1189 | ||
1190 | if (rt) | |
1716a961 | 1191 | rt6_set_expires(rt, jiffies + (HZ * lifetime)); |
1da177e4 LT |
1192 | if (ra_msg->icmph.icmp6_hop_limit) { |
1193 | in6_dev->cnf.hop_limit = ra_msg->icmph.icmp6_hop_limit; | |
1194 | if (rt) | |
defb3519 DM |
1195 | dst_metric_set(&rt->dst, RTAX_HOPLIMIT, |
1196 | ra_msg->icmph.icmp6_hop_limit); | |
1da177e4 LT |
1197 | } |
1198 | ||
65f5c7c1 YH |
1199 | skip_defrtr: |
1200 | ||
1da177e4 LT |
1201 | /* |
1202 | * Update Reachable Time and Retrans Timer | |
1203 | */ | |
1204 | ||
1205 | if (in6_dev->nd_parms) { | |
1206 | unsigned long rtime = ntohl(ra_msg->retrans_timer); | |
1207 | ||
1208 | if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/HZ) { | |
1209 | rtime = (rtime*HZ)/1000; | |
1210 | if (rtime < HZ/10) | |
1211 | rtime = HZ/10; | |
1212 | in6_dev->nd_parms->retrans_time = rtime; | |
1213 | in6_dev->tstamp = jiffies; | |
1214 | inet6_ifinfo_notify(RTM_NEWLINK, in6_dev); | |
1215 | } | |
1216 | ||
1217 | rtime = ntohl(ra_msg->reachable_time); | |
1218 | if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/(3*HZ)) { | |
1219 | rtime = (rtime*HZ)/1000; | |
1220 | ||
1221 | if (rtime < HZ/10) | |
1222 | rtime = HZ/10; | |
1223 | ||
1224 | if (rtime != in6_dev->nd_parms->base_reachable_time) { | |
1225 | in6_dev->nd_parms->base_reachable_time = rtime; | |
1226 | in6_dev->nd_parms->gc_staletime = 3 * rtime; | |
1227 | in6_dev->nd_parms->reachable_time = neigh_rand_reach_time(rtime); | |
1228 | in6_dev->tstamp = jiffies; | |
1229 | inet6_ifinfo_notify(RTM_NEWLINK, in6_dev); | |
1230 | } | |
1231 | } | |
1232 | } | |
1233 | ||
fadf6bf0 TF |
1234 | skip_linkparms: |
1235 | ||
1da177e4 LT |
1236 | /* |
1237 | * Process options. | |
1238 | */ | |
1239 | ||
1240 | if (!neigh) | |
0660e03f | 1241 | neigh = __neigh_lookup(&nd_tbl, &ipv6_hdr(skb)->saddr, |
1da177e4 LT |
1242 | skb->dev, 1); |
1243 | if (neigh) { | |
1244 | u8 *lladdr = NULL; | |
1245 | if (ndopts.nd_opts_src_lladdr) { | |
1246 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, | |
1247 | skb->dev); | |
1248 | if (!lladdr) { | |
675418d5 JP |
1249 | ND_PRINTK(2, warn, |
1250 | "RA: invalid link-layer address length\n"); | |
1da177e4 LT |
1251 | goto out; |
1252 | } | |
1253 | } | |
1254 | neigh_update(neigh, lladdr, NUD_STALE, | |
1255 | NEIGH_UPDATE_F_WEAK_OVERRIDE| | |
1256 | NEIGH_UPDATE_F_OVERRIDE| | |
1257 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
1258 | NEIGH_UPDATE_F_ISROUTER); | |
1259 | } | |
1260 | ||
aeaf6e9d | 1261 | if (!ipv6_accept_ra(in6_dev)) |
31ce8c71 DW |
1262 | goto out; |
1263 | ||
70ceb4f5 | 1264 | #ifdef CONFIG_IPV6_ROUTE_INFO |
9f56220f AH |
1265 | if (ipv6_chk_addr(dev_net(in6_dev->dev), &ipv6_hdr(skb)->saddr, NULL, 0)) |
1266 | goto skip_routeinfo; | |
1267 | ||
09c884d4 | 1268 | if (in6_dev->cnf.accept_ra_rtr_pref && ndopts.nd_opts_ri) { |
70ceb4f5 YH |
1269 | struct nd_opt_hdr *p; |
1270 | for (p = ndopts.nd_opts_ri; | |
1271 | p; | |
1272 | p = ndisc_next_option(p, ndopts.nd_opts_ri_end)) { | |
6294e000 YH |
1273 | struct route_info *ri = (struct route_info *)p; |
1274 | #ifdef CONFIG_IPV6_NDISC_NODETYPE | |
1275 | if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT && | |
1276 | ri->prefix_len == 0) | |
1277 | continue; | |
1278 | #endif | |
1279 | if (ri->prefix_len > in6_dev->cnf.accept_ra_rt_info_max_plen) | |
09c884d4 | 1280 | continue; |
70ceb4f5 | 1281 | rt6_route_rcv(skb->dev, (u8*)p, (p->nd_opt_len) << 3, |
0660e03f | 1282 | &ipv6_hdr(skb)->saddr); |
70ceb4f5 YH |
1283 | } |
1284 | } | |
9f56220f AH |
1285 | |
1286 | skip_routeinfo: | |
70ceb4f5 YH |
1287 | #endif |
1288 | ||
de357cc0 | 1289 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 TF |
1290 | /* skip link-specific ndopts from interior routers */ |
1291 | if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT) | |
1292 | goto out; | |
de357cc0 | 1293 | #endif |
fadf6bf0 | 1294 | |
c4fd30eb | 1295 | if (in6_dev->cnf.accept_ra_pinfo && ndopts.nd_opts_pi) { |
1da177e4 LT |
1296 | struct nd_opt_hdr *p; |
1297 | for (p = ndopts.nd_opts_pi; | |
1298 | p; | |
1299 | p = ndisc_next_option(p, ndopts.nd_opts_pi_end)) { | |
e6bff995 NH |
1300 | addrconf_prefix_rcv(skb->dev, (u8 *)p, |
1301 | (p->nd_opt_len) << 3, | |
1302 | ndopts.nd_opts_src_lladdr != NULL); | |
1da177e4 LT |
1303 | } |
1304 | } | |
1305 | ||
1306 | if (ndopts.nd_opts_mtu) { | |
e69a4adc | 1307 | __be32 n; |
1da177e4 LT |
1308 | u32 mtu; |
1309 | ||
e69a4adc AV |
1310 | memcpy(&n, ((u8*)(ndopts.nd_opts_mtu+1))+2, sizeof(mtu)); |
1311 | mtu = ntohl(n); | |
1da177e4 LT |
1312 | |
1313 | if (mtu < IPV6_MIN_MTU || mtu > skb->dev->mtu) { | |
675418d5 | 1314 | ND_PRINTK(2, warn, "RA: invalid mtu: %d\n", mtu); |
1da177e4 LT |
1315 | } else if (in6_dev->cnf.mtu6 != mtu) { |
1316 | in6_dev->cnf.mtu6 = mtu; | |
1317 | ||
1318 | if (rt) | |
defb3519 | 1319 | dst_metric_set(&rt->dst, RTAX_MTU, mtu); |
1da177e4 LT |
1320 | |
1321 | rt6_mtu_change(skb->dev, mtu); | |
1322 | } | |
1323 | } | |
1ab1457c | 1324 | |
31910575 | 1325 | if (ndopts.nd_useropts) { |
61cf46ad YH |
1326 | struct nd_opt_hdr *p; |
1327 | for (p = ndopts.nd_useropts; | |
1328 | p; | |
1329 | p = ndisc_next_useropt(p, ndopts.nd_useropts_end)) { | |
1330 | ndisc_ra_useropt(skb, p); | |
31910575 PY |
1331 | } |
1332 | } | |
1333 | ||
1da177e4 | 1334 | if (ndopts.nd_opts_tgt_lladdr || ndopts.nd_opts_rh) { |
675418d5 | 1335 | ND_PRINTK(2, warn, "RA: invalid RA options\n"); |
1da177e4 LT |
1336 | } |
1337 | out: | |
94e187c0 | 1338 | ip6_rt_put(rt); |
eb857186 | 1339 | if (neigh) |
1da177e4 | 1340 | neigh_release(neigh); |
1da177e4 LT |
1341 | } |
1342 | ||
1343 | static void ndisc_redirect_rcv(struct sk_buff *skb) | |
1344 | { | |
093d04d4 DJ |
1345 | u8 *hdr; |
1346 | struct ndisc_options ndopts; | |
1347 | struct rd_msg *msg = (struct rd_msg *)skb_transport_header(skb); | |
1348 | u32 ndoptlen = skb->tail - (skb->transport_header + | |
1349 | offsetof(struct rd_msg, opt)); | |
1350 | ||
de357cc0 | 1351 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 TF |
1352 | switch (skb->ndisc_nodetype) { |
1353 | case NDISC_NODETYPE_HOST: | |
1354 | case NDISC_NODETYPE_NODEFAULT: | |
675418d5 JP |
1355 | ND_PRINTK(2, warn, |
1356 | "Redirect: from host or unauthorized router\n"); | |
fadf6bf0 TF |
1357 | return; |
1358 | } | |
de357cc0 | 1359 | #endif |
fadf6bf0 | 1360 | |
0660e03f | 1361 | if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) { |
675418d5 JP |
1362 | ND_PRINTK(2, warn, |
1363 | "Redirect: source address is not link-local\n"); | |
1da177e4 LT |
1364 | return; |
1365 | } | |
1366 | ||
093d04d4 DJ |
1367 | if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) |
1368 | return; | |
1369 | ||
1370 | if (!ndopts.nd_opts_rh) | |
1371 | return; | |
1372 | ||
1373 | hdr = (u8 *)ndopts.nd_opts_rh; | |
1374 | hdr += 8; | |
1375 | if (!pskb_pull(skb, hdr - skb_transport_header(skb))) | |
1376 | return; | |
1377 | ||
b94f1c09 | 1378 | icmpv6_notify(skb, NDISC_REDIRECT, 0, 0); |
1da177e4 LT |
1379 | } |
1380 | ||
9c86dafe YH |
1381 | static u8 *ndisc_fill_redirect_hdr_option(u8 *opt, struct sk_buff *orig_skb, |
1382 | int rd_len) | |
1383 | { | |
1384 | memset(opt, 0, 8); | |
1385 | *(opt++) = ND_OPT_REDIRECT_HDR; | |
1386 | *(opt++) = (rd_len >> 3); | |
1387 | opt += 6; | |
1388 | ||
1389 | memcpy(opt, ipv6_hdr(orig_skb), rd_len - 8); | |
1390 | ||
1391 | return opt + rd_len - 8; | |
1392 | } | |
1393 | ||
4991969a | 1394 | void ndisc_send_redirect(struct sk_buff *skb, const struct in6_addr *target) |
1da177e4 | 1395 | { |
1762f7e8 | 1396 | struct net_device *dev = skb->dev; |
c346dca1 | 1397 | struct net *net = dev_net(dev); |
1762f7e8 | 1398 | struct sock *sk = net->ipv6.ndisc_sk; |
71bcdba0 | 1399 | int len = sizeof(struct rd_msg); |
fbfe95a4 | 1400 | struct inet_peer *peer; |
1da177e4 | 1401 | struct sk_buff *buff; |
71bcdba0 | 1402 | struct rd_msg *msg; |
1da177e4 | 1403 | struct in6_addr saddr_buf; |
1da177e4 LT |
1404 | struct rt6_info *rt; |
1405 | struct dst_entry *dst; | |
1406 | struct inet6_dev *idev; | |
4c9483b2 | 1407 | struct flowi6 fl6; |
1da177e4 LT |
1408 | u8 *opt; |
1409 | int rd_len; | |
1410 | int err; | |
1da177e4 | 1411 | u8 ha_buf[MAX_ADDR_LEN], *ha = NULL; |
1d861aa4 | 1412 | bool ret; |
1da177e4 | 1413 | |
95c385b4 | 1414 | if (ipv6_get_lladdr(dev, &saddr_buf, IFA_F_TENTATIVE)) { |
675418d5 JP |
1415 | ND_PRINTK(2, warn, "Redirect: no link-local address on %s\n", |
1416 | dev->name); | |
1ab1457c YH |
1417 | return; |
1418 | } | |
1da177e4 | 1419 | |
0660e03f | 1420 | if (!ipv6_addr_equal(&ipv6_hdr(skb)->daddr, target) && |
bf0b48df | 1421 | ipv6_addr_type(target) != (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) { |
675418d5 JP |
1422 | ND_PRINTK(2, warn, |
1423 | "Redirect: target address is not link-local unicast\n"); | |
29556526 LY |
1424 | return; |
1425 | } | |
1426 | ||
4c9483b2 | 1427 | icmpv6_flow_init(sk, &fl6, NDISC_REDIRECT, |
95e41e93 | 1428 | &saddr_buf, &ipv6_hdr(skb)->saddr, dev->ifindex); |
1da177e4 | 1429 | |
4c9483b2 | 1430 | dst = ip6_route_output(net, NULL, &fl6); |
5095d64d RL |
1431 | if (dst->error) { |
1432 | dst_release(dst); | |
1da177e4 | 1433 | return; |
5095d64d | 1434 | } |
4c9483b2 | 1435 | dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), NULL, 0); |
452edd59 | 1436 | if (IS_ERR(dst)) |
1da177e4 | 1437 | return; |
1da177e4 LT |
1438 | |
1439 | rt = (struct rt6_info *) dst; | |
1440 | ||
1441 | if (rt->rt6i_flags & RTF_GATEWAY) { | |
675418d5 JP |
1442 | ND_PRINTK(2, warn, |
1443 | "Redirect: destination is not a neighbour\n"); | |
d73f0801 | 1444 | goto release; |
1da177e4 | 1445 | } |
1d861aa4 DM |
1446 | peer = inet_getpeer_v6(net->ipv6.peers, &rt->rt6i_dst.addr, 1); |
1447 | ret = inet_peer_xrlim_allow(peer, 1*HZ); | |
1448 | if (peer) | |
1449 | inet_putpeer(peer); | |
1450 | if (!ret) | |
d73f0801 | 1451 | goto release; |
1da177e4 LT |
1452 | |
1453 | if (dev->addr_len) { | |
4991969a DM |
1454 | struct neighbour *neigh = dst_neigh_lookup(skb_dst(skb), target); |
1455 | if (!neigh) { | |
675418d5 JP |
1456 | ND_PRINTK(2, warn, |
1457 | "Redirect: no neigh for target address\n"); | |
4991969a DM |
1458 | goto release; |
1459 | } | |
1460 | ||
1da177e4 LT |
1461 | read_lock_bh(&neigh->lock); |
1462 | if (neigh->nud_state & NUD_VALID) { | |
1463 | memcpy(ha_buf, neigh->ha, dev->addr_len); | |
1464 | read_unlock_bh(&neigh->lock); | |
1465 | ha = ha_buf; | |
1466 | len += ndisc_opt_addr_space(dev); | |
1467 | } else | |
1468 | read_unlock_bh(&neigh->lock); | |
4991969a DM |
1469 | |
1470 | neigh_release(neigh); | |
1da177e4 LT |
1471 | } |
1472 | ||
1473 | rd_len = min_t(unsigned int, | |
1474 | IPV6_MIN_MTU-sizeof(struct ipv6hdr)-len, skb->len + 8); | |
1475 | rd_len &= ~0x7; | |
1476 | len += rd_len; | |
1477 | ||
de09334b YH |
1478 | buff = ndisc_alloc_skb(dev, len); |
1479 | if (!buff) | |
d73f0801 | 1480 | goto release; |
1da177e4 | 1481 | |
f382d03a | 1482 | ip6_nd_hdr(buff, &saddr_buf, &ipv6_hdr(skb)->saddr, |
c8d6c380 | 1483 | inet6_sk(sk)->hop_limit, len); |
1da177e4 | 1484 | |
27a884dc | 1485 | skb_set_transport_header(buff, skb_tail_pointer(buff) - buff->data); |
d10ba34b | 1486 | skb_put(buff, len); |
71bcdba0 | 1487 | msg = (struct rd_msg *)icmp6_hdr(buff); |
1da177e4 | 1488 | |
71bcdba0 YH |
1489 | memset(&msg->icmph, 0, sizeof(struct icmp6hdr)); |
1490 | msg->icmph.icmp6_type = NDISC_REDIRECT; | |
1da177e4 LT |
1491 | |
1492 | /* | |
1493 | * copy target and destination addresses | |
1494 | */ | |
1495 | ||
71bcdba0 YH |
1496 | msg->target = *target; |
1497 | msg->dest = ipv6_hdr(skb)->daddr; | |
1da177e4 | 1498 | |
71bcdba0 | 1499 | opt = msg->opt; |
1da177e4 LT |
1500 | |
1501 | /* | |
1502 | * include target_address option | |
1503 | */ | |
1504 | ||
1505 | if (ha) | |
315ff09d | 1506 | opt = ndisc_fill_addr_option(opt, ND_OPT_TARGET_LL_ADDR, ha, dev); |
1da177e4 LT |
1507 | |
1508 | /* | |
1509 | * build redirect option and copy skb over to the new packet. | |
1510 | */ | |
1511 | ||
9c86dafe YH |
1512 | if (rd_len) |
1513 | opt = ndisc_fill_redirect_hdr_option(opt, skb, rd_len); | |
1da177e4 | 1514 | |
71bcdba0 YH |
1515 | msg->icmph.icmp6_cksum = csum_ipv6_magic(&saddr_buf, &ipv6_hdr(skb)->saddr, |
1516 | len, IPPROTO_ICMPV6, | |
1517 | csum_partial(msg, len, 0)); | |
1da177e4 | 1518 | |
adf30907 | 1519 | skb_dst_set(buff, dst); |
cfdf7647 ED |
1520 | rcu_read_lock(); |
1521 | idev = __in6_dev_get(dst->dev); | |
edf391ff | 1522 | IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len); |
b2e0b385 | 1523 | err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, buff, NULL, dst->dev, |
6e23ae2a | 1524 | dst_output); |
1da177e4 | 1525 | if (!err) { |
5c5d244b | 1526 | ICMP6MSGOUT_INC_STATS(net, idev, NDISC_REDIRECT); |
a862f6a6 | 1527 | ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); |
1da177e4 LT |
1528 | } |
1529 | ||
cfdf7647 | 1530 | rcu_read_unlock(); |
d73f0801 IJ |
1531 | return; |
1532 | ||
1533 | release: | |
1534 | dst_release(dst); | |
1da177e4 LT |
1535 | } |
1536 | ||
1537 | static void pndisc_redo(struct sk_buff *skb) | |
1538 | { | |
140e26fc | 1539 | ndisc_recv_ns(skb); |
1da177e4 LT |
1540 | kfree_skb(skb); |
1541 | } | |
1542 | ||
1543 | int ndisc_rcv(struct sk_buff *skb) | |
1544 | { | |
1545 | struct nd_msg *msg; | |
1546 | ||
6bce6b4e | 1547 | if (skb_linearize(skb)) |
1da177e4 LT |
1548 | return 0; |
1549 | ||
9c70220b | 1550 | msg = (struct nd_msg *)skb_transport_header(skb); |
1da177e4 | 1551 | |
9c70220b | 1552 | __skb_push(skb, skb->data - skb_transport_header(skb)); |
1da177e4 | 1553 | |
0660e03f | 1554 | if (ipv6_hdr(skb)->hop_limit != 255) { |
675418d5 JP |
1555 | ND_PRINTK(2, warn, "NDISC: invalid hop-limit: %d\n", |
1556 | ipv6_hdr(skb)->hop_limit); | |
1da177e4 LT |
1557 | return 0; |
1558 | } | |
1559 | ||
1560 | if (msg->icmph.icmp6_code != 0) { | |
675418d5 JP |
1561 | ND_PRINTK(2, warn, "NDISC: invalid ICMPv6 code: %d\n", |
1562 | msg->icmph.icmp6_code); | |
1da177e4 LT |
1563 | return 0; |
1564 | } | |
1565 | ||
a61bbcf2 PM |
1566 | memset(NEIGH_CB(skb), 0, sizeof(struct neighbour_cb)); |
1567 | ||
1da177e4 LT |
1568 | switch (msg->icmph.icmp6_type) { |
1569 | case NDISC_NEIGHBOUR_SOLICITATION: | |
1570 | ndisc_recv_ns(skb); | |
1571 | break; | |
1572 | ||
1573 | case NDISC_NEIGHBOUR_ADVERTISEMENT: | |
1574 | ndisc_recv_na(skb); | |
1575 | break; | |
1576 | ||
1577 | case NDISC_ROUTER_SOLICITATION: | |
1578 | ndisc_recv_rs(skb); | |
1579 | break; | |
1580 | ||
1581 | case NDISC_ROUTER_ADVERTISEMENT: | |
1582 | ndisc_router_discovery(skb); | |
1583 | break; | |
1584 | ||
1585 | case NDISC_REDIRECT: | |
1586 | ndisc_redirect_rcv(skb); | |
1587 | break; | |
3ff50b79 | 1588 | } |
1da177e4 LT |
1589 | |
1590 | return 0; | |
1591 | } | |
1592 | ||
1593 | static int ndisc_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1594 | { | |
1595 | struct net_device *dev = ptr; | |
c346dca1 | 1596 | struct net *net = dev_net(dev); |
5cb04436 | 1597 | struct inet6_dev *idev; |
1da177e4 LT |
1598 | |
1599 | switch (event) { | |
1600 | case NETDEV_CHANGEADDR: | |
1601 | neigh_changeaddr(&nd_tbl, dev); | |
5b7c931d | 1602 | fib6_run_gc(~0UL, net); |
5cb04436 HFS |
1603 | idev = in6_dev_get(dev); |
1604 | if (!idev) | |
1605 | break; | |
1606 | if (idev->cnf.ndisc_notify) | |
1607 | ndisc_send_unsol_na(dev); | |
1608 | in6_dev_put(idev); | |
1da177e4 LT |
1609 | break; |
1610 | case NETDEV_DOWN: | |
1611 | neigh_ifdown(&nd_tbl, dev); | |
5b7c931d | 1612 | fib6_run_gc(~0UL, net); |
1da177e4 | 1613 | break; |
f47b9464 BH |
1614 | case NETDEV_NOTIFY_PEERS: |
1615 | ndisc_send_unsol_na(dev); | |
1616 | break; | |
1da177e4 LT |
1617 | default: |
1618 | break; | |
1619 | } | |
1620 | ||
1621 | return NOTIFY_DONE; | |
1622 | } | |
1623 | ||
1624 | static struct notifier_block ndisc_netdev_notifier = { | |
1625 | .notifier_call = ndisc_netdev_event, | |
1626 | }; | |
1627 | ||
1628 | #ifdef CONFIG_SYSCTL | |
1629 | static void ndisc_warn_deprecated_sysctl(struct ctl_table *ctl, | |
1630 | const char *func, const char *dev_name) | |
1631 | { | |
1632 | static char warncomm[TASK_COMM_LEN]; | |
1633 | static int warned; | |
1634 | if (strcmp(warncomm, current->comm) && warned < 5) { | |
1635 | strcpy(warncomm, current->comm); | |
f3213831 | 1636 | pr_warn("process `%s' is using deprecated sysctl (%s) net.ipv6.neigh.%s.%s - use net.ipv6.neigh.%s.%s_ms instead\n", |
1da177e4 LT |
1637 | warncomm, func, |
1638 | dev_name, ctl->procname, | |
1639 | dev_name, ctl->procname); | |
1640 | warned++; | |
1641 | } | |
1642 | } | |
1643 | ||
8d65af78 | 1644 | int ndisc_ifinfo_sysctl_change(struct ctl_table *ctl, int write, void __user *buffer, size_t *lenp, loff_t *ppos) |
1da177e4 LT |
1645 | { |
1646 | struct net_device *dev = ctl->extra1; | |
1647 | struct inet6_dev *idev; | |
1648 | int ret; | |
1649 | ||
d12af679 EB |
1650 | if ((strcmp(ctl->procname, "retrans_time") == 0) || |
1651 | (strcmp(ctl->procname, "base_reachable_time") == 0)) | |
1da177e4 LT |
1652 | ndisc_warn_deprecated_sysctl(ctl, "syscall", dev ? dev->name : "default"); |
1653 | ||
d12af679 | 1654 | if (strcmp(ctl->procname, "retrans_time") == 0) |
8d65af78 | 1655 | ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
d12af679 EB |
1656 | |
1657 | else if (strcmp(ctl->procname, "base_reachable_time") == 0) | |
1da177e4 | 1658 | ret = proc_dointvec_jiffies(ctl, write, |
8d65af78 | 1659 | buffer, lenp, ppos); |
d12af679 EB |
1660 | |
1661 | else if ((strcmp(ctl->procname, "retrans_time_ms") == 0) || | |
ad02ac14 | 1662 | (strcmp(ctl->procname, "base_reachable_time_ms") == 0)) |
1da177e4 | 1663 | ret = proc_dointvec_ms_jiffies(ctl, write, |
8d65af78 | 1664 | buffer, lenp, ppos); |
d12af679 | 1665 | else |
1da177e4 | 1666 | ret = -1; |
1da177e4 LT |
1667 | |
1668 | if (write && ret == 0 && dev && (idev = in6_dev_get(dev)) != NULL) { | |
d12af679 | 1669 | if (ctl->data == &idev->nd_parms->base_reachable_time) |
1da177e4 LT |
1670 | idev->nd_parms->reachable_time = neigh_rand_reach_time(idev->nd_parms->base_reachable_time); |
1671 | idev->tstamp = jiffies; | |
1672 | inet6_ifinfo_notify(RTM_NEWLINK, idev); | |
1673 | in6_dev_put(idev); | |
1674 | } | |
1675 | return ret; | |
1676 | } | |
1677 | ||
1da177e4 LT |
1678 | |
1679 | #endif | |
1680 | ||
2c8c1e72 | 1681 | static int __net_init ndisc_net_init(struct net *net) |
1da177e4 LT |
1682 | { |
1683 | struct ipv6_pinfo *np; | |
1684 | struct sock *sk; | |
1ab1457c | 1685 | int err; |
1da177e4 | 1686 | |
1ed8516f DL |
1687 | err = inet_ctl_sock_create(&sk, PF_INET6, |
1688 | SOCK_RAW, IPPROTO_ICMPV6, net); | |
1da177e4 | 1689 | if (err < 0) { |
675418d5 JP |
1690 | ND_PRINTK(0, err, |
1691 | "NDISC: Failed to initialize the control socket (err %d)\n", | |
1692 | err); | |
1da177e4 LT |
1693 | return err; |
1694 | } | |
1695 | ||
1ed8516f | 1696 | net->ipv6.ndisc_sk = sk; |
1762f7e8 | 1697 | |
1da177e4 | 1698 | np = inet6_sk(sk); |
1da177e4 LT |
1699 | np->hop_limit = 255; |
1700 | /* Do not loopback ndisc messages */ | |
1701 | np->mc_loop = 0; | |
1da177e4 | 1702 | |
1762f7e8 DL |
1703 | return 0; |
1704 | } | |
1705 | ||
2c8c1e72 | 1706 | static void __net_exit ndisc_net_exit(struct net *net) |
1762f7e8 | 1707 | { |
1ed8516f | 1708 | inet_ctl_sock_destroy(net->ipv6.ndisc_sk); |
1762f7e8 DL |
1709 | } |
1710 | ||
1711 | static struct pernet_operations ndisc_net_ops = { | |
1712 | .init = ndisc_net_init, | |
1713 | .exit = ndisc_net_exit, | |
1714 | }; | |
1715 | ||
1716 | int __init ndisc_init(void) | |
1717 | { | |
1718 | int err; | |
1719 | ||
1720 | err = register_pernet_subsys(&ndisc_net_ops); | |
1721 | if (err) | |
1722 | return err; | |
1ab1457c YH |
1723 | /* |
1724 | * Initialize the neighbour table | |
1725 | */ | |
1da177e4 LT |
1726 | neigh_table_init(&nd_tbl); |
1727 | ||
1728 | #ifdef CONFIG_SYSCTL | |
54716e3b | 1729 | err = neigh_sysctl_register(NULL, &nd_tbl.parms, "ipv6", |
f8572d8f | 1730 | &ndisc_ifinfo_sysctl_change); |
1762f7e8 DL |
1731 | if (err) |
1732 | goto out_unregister_pernet; | |
1da177e4 | 1733 | #endif |
1762f7e8 DL |
1734 | err = register_netdevice_notifier(&ndisc_netdev_notifier); |
1735 | if (err) | |
1736 | goto out_unregister_sysctl; | |
1737 | out: | |
1738 | return err; | |
1da177e4 | 1739 | |
1762f7e8 DL |
1740 | out_unregister_sysctl: |
1741 | #ifdef CONFIG_SYSCTL | |
1742 | neigh_sysctl_unregister(&nd_tbl.parms); | |
1743 | out_unregister_pernet: | |
1744 | #endif | |
1745 | unregister_pernet_subsys(&ndisc_net_ops); | |
1746 | goto out; | |
1da177e4 LT |
1747 | } |
1748 | ||
1749 | void ndisc_cleanup(void) | |
1750 | { | |
36f73d0c | 1751 | unregister_netdevice_notifier(&ndisc_netdev_notifier); |
1da177e4 LT |
1752 | #ifdef CONFIG_SYSCTL |
1753 | neigh_sysctl_unregister(&nd_tbl.parms); | |
1754 | #endif | |
1755 | neigh_table_clear(&nd_tbl); | |
1762f7e8 | 1756 | unregister_pernet_subsys(&ndisc_net_ops); |
1da177e4 | 1757 | } |