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 | ||
d6bf7817 ED |
75 | static u32 ndisc_hash(const void *pkey, |
76 | const struct net_device *dev, | |
2c2aba6c | 77 | __u32 *hash_rnd); |
60395a20 | 78 | static bool ndisc_key_eq(const struct neighbour *neigh, const void *pkey); |
1da177e4 LT |
79 | static int ndisc_constructor(struct neighbour *neigh); |
80 | static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb); | |
81 | static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb); | |
82 | static int pndisc_constructor(struct pneigh_entry *n); | |
83 | static void pndisc_destructor(struct pneigh_entry *n); | |
84 | static void pndisc_redo(struct sk_buff *skb); | |
85 | ||
89d69d2b | 86 | static const struct neigh_ops ndisc_generic_ops = { |
1da177e4 LT |
87 | .family = AF_INET6, |
88 | .solicit = ndisc_solicit, | |
89 | .error_report = ndisc_error_report, | |
90 | .output = neigh_resolve_output, | |
91 | .connected_output = neigh_connected_output, | |
1da177e4 LT |
92 | }; |
93 | ||
89d69d2b | 94 | static const struct neigh_ops ndisc_hh_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_resolve_output, | |
1da177e4 LT |
100 | }; |
101 | ||
102 | ||
89d69d2b | 103 | static const struct neigh_ops ndisc_direct_ops = { |
1da177e4 | 104 | .family = AF_INET6, |
8f40b161 DM |
105 | .output = neigh_direct_output, |
106 | .connected_output = neigh_direct_output, | |
1da177e4 LT |
107 | }; |
108 | ||
109 | struct neigh_table nd_tbl = { | |
110 | .family = AF_INET6, | |
1da177e4 | 111 | .key_len = sizeof(struct in6_addr), |
bdf53c58 | 112 | .protocol = cpu_to_be16(ETH_P_IPV6), |
1da177e4 | 113 | .hash = ndisc_hash, |
60395a20 | 114 | .key_eq = ndisc_key_eq, |
1da177e4 LT |
115 | .constructor = ndisc_constructor, |
116 | .pconstructor = pndisc_constructor, | |
117 | .pdestructor = pndisc_destructor, | |
118 | .proxy_redo = pndisc_redo, | |
119 | .id = "ndisc_cache", | |
120 | .parms = { | |
b672083e | 121 | .tbl = &nd_tbl, |
b672083e | 122 | .reachable_time = ND_REACHABLE_TIME, |
1f9248e5 JP |
123 | .data = { |
124 | [NEIGH_VAR_MCAST_PROBES] = 3, | |
125 | [NEIGH_VAR_UCAST_PROBES] = 3, | |
126 | [NEIGH_VAR_RETRANS_TIME] = ND_RETRANS_TIMER, | |
127 | [NEIGH_VAR_BASE_REACHABLE_TIME] = ND_REACHABLE_TIME, | |
128 | [NEIGH_VAR_DELAY_PROBE_TIME] = 5 * HZ, | |
129 | [NEIGH_VAR_GC_STALETIME] = 60 * HZ, | |
130 | [NEIGH_VAR_QUEUE_LEN_BYTES] = 64 * 1024, | |
131 | [NEIGH_VAR_PROXY_QLEN] = 64, | |
132 | [NEIGH_VAR_ANYCAST_DELAY] = 1 * HZ, | |
133 | [NEIGH_VAR_PROXY_DELAY] = (8 * HZ) / 10, | |
134 | }, | |
1da177e4 LT |
135 | }, |
136 | .gc_interval = 30 * HZ, | |
137 | .gc_thresh1 = 128, | |
138 | .gc_thresh2 = 512, | |
139 | .gc_thresh3 = 1024, | |
140 | }; | |
c4850687 | 141 | EXPORT_SYMBOL_GPL(nd_tbl); |
1da177e4 | 142 | |
cc84b3c6 AA |
143 | void __ndisc_fill_addr_option(struct sk_buff *skb, int type, void *data, |
144 | int data_len, int pad) | |
1da177e4 | 145 | { |
8ec5da41 | 146 | int space = __ndisc_opt_addr_space(data_len, pad); |
5f5a0115 | 147 | u8 *opt = skb_put(skb, space); |
1da177e4 LT |
148 | |
149 | opt[0] = type; | |
150 | opt[1] = space>>3; | |
151 | ||
152 | memset(opt + 2, 0, pad); | |
153 | opt += pad; | |
154 | space -= pad; | |
155 | ||
156 | memcpy(opt+2, data, data_len); | |
157 | data_len += 2; | |
158 | opt += data_len; | |
e5d08d71 IM |
159 | space -= data_len; |
160 | if (space > 0) | |
1da177e4 | 161 | memset(opt, 0, space); |
1da177e4 | 162 | } |
cc84b3c6 | 163 | EXPORT_SYMBOL_GPL(__ndisc_fill_addr_option); |
1da177e4 | 164 | |
8ec5da41 | 165 | static inline void ndisc_fill_addr_option(struct sk_buff *skb, int type, |
f997c55c | 166 | void *data, u8 icmp6_type) |
8ec5da41 AA |
167 | { |
168 | __ndisc_fill_addr_option(skb, type, data, skb->dev->addr_len, | |
169 | ndisc_addr_option_pad(skb->dev->type)); | |
f997c55c AA |
170 | ndisc_ops_fill_addr_option(skb->dev, skb, icmp6_type); |
171 | } | |
172 | ||
173 | static inline void ndisc_fill_redirect_addr_option(struct sk_buff *skb, | |
174 | void *ha, | |
175 | const u8 *ops_data) | |
176 | { | |
177 | ndisc_fill_addr_option(skb, ND_OPT_TARGET_LL_ADDR, ha, NDISC_REDIRECT); | |
178 | ndisc_ops_fill_redirect_addr_option(skb->dev, skb, ops_data); | |
8ec5da41 AA |
179 | } |
180 | ||
1da177e4 LT |
181 | static struct nd_opt_hdr *ndisc_next_option(struct nd_opt_hdr *cur, |
182 | struct nd_opt_hdr *end) | |
183 | { | |
184 | int type; | |
185 | if (!cur || !end || cur >= end) | |
186 | return NULL; | |
187 | type = cur->nd_opt_type; | |
188 | do { | |
189 | cur = ((void *)cur) + (cur->nd_opt_len << 3); | |
67ba4152 | 190 | } while (cur < end && cur->nd_opt_type != type); |
a02cec21 | 191 | return cur <= end && cur->nd_opt_type == type ? cur : NULL; |
1da177e4 LT |
192 | } |
193 | ||
f997c55c AA |
194 | static inline int ndisc_is_useropt(const struct net_device *dev, |
195 | struct nd_opt_hdr *opt) | |
31910575 | 196 | { |
e35f30c1 | 197 | return opt->nd_opt_type == ND_OPT_RDNSS || |
f997c55c AA |
198 | opt->nd_opt_type == ND_OPT_DNSSL || |
199 | ndisc_ops_is_useropt(dev, opt->nd_opt_type); | |
31910575 PY |
200 | } |
201 | ||
f997c55c AA |
202 | static struct nd_opt_hdr *ndisc_next_useropt(const struct net_device *dev, |
203 | struct nd_opt_hdr *cur, | |
31910575 PY |
204 | struct nd_opt_hdr *end) |
205 | { | |
206 | if (!cur || !end || cur >= end) | |
207 | return NULL; | |
208 | do { | |
209 | cur = ((void *)cur) + (cur->nd_opt_len << 3); | |
f997c55c AA |
210 | } while (cur < end && !ndisc_is_useropt(dev, cur)); |
211 | return cur <= end && ndisc_is_useropt(dev, cur) ? cur : NULL; | |
31910575 PY |
212 | } |
213 | ||
f997c55c AA |
214 | struct ndisc_options *ndisc_parse_options(const struct net_device *dev, |
215 | u8 *opt, int opt_len, | |
30f2a5f3 | 216 | struct ndisc_options *ndopts) |
1da177e4 LT |
217 | { |
218 | struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)opt; | |
219 | ||
220 | if (!nd_opt || opt_len < 0 || !ndopts) | |
221 | return NULL; | |
222 | memset(ndopts, 0, sizeof(*ndopts)); | |
223 | while (opt_len) { | |
224 | int l; | |
225 | if (opt_len < sizeof(struct nd_opt_hdr)) | |
226 | return NULL; | |
227 | l = nd_opt->nd_opt_len << 3; | |
228 | if (opt_len < l || l == 0) | |
229 | return NULL; | |
f997c55c AA |
230 | if (ndisc_ops_parse_options(dev, nd_opt, ndopts)) |
231 | goto next_opt; | |
1da177e4 LT |
232 | switch (nd_opt->nd_opt_type) { |
233 | case ND_OPT_SOURCE_LL_ADDR: | |
234 | case ND_OPT_TARGET_LL_ADDR: | |
235 | case ND_OPT_MTU: | |
236 | case ND_OPT_REDIRECT_HDR: | |
237 | if (ndopts->nd_opt_array[nd_opt->nd_opt_type]) { | |
675418d5 JP |
238 | ND_PRINTK(2, warn, |
239 | "%s: duplicated ND6 option found: type=%d\n", | |
240 | __func__, nd_opt->nd_opt_type); | |
1da177e4 LT |
241 | } else { |
242 | ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt; | |
243 | } | |
244 | break; | |
245 | case ND_OPT_PREFIX_INFO: | |
246 | ndopts->nd_opts_pi_end = nd_opt; | |
cfcabdcc | 247 | if (!ndopts->nd_opt_array[nd_opt->nd_opt_type]) |
1da177e4 LT |
248 | ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt; |
249 | break; | |
70ceb4f5 YH |
250 | #ifdef CONFIG_IPV6_ROUTE_INFO |
251 | case ND_OPT_ROUTE_INFO: | |
252 | ndopts->nd_opts_ri_end = nd_opt; | |
253 | if (!ndopts->nd_opts_ri) | |
254 | ndopts->nd_opts_ri = nd_opt; | |
255 | break; | |
256 | #endif | |
1da177e4 | 257 | default: |
f997c55c | 258 | if (ndisc_is_useropt(dev, nd_opt)) { |
31910575 PY |
259 | ndopts->nd_useropts_end = nd_opt; |
260 | if (!ndopts->nd_useropts) | |
261 | ndopts->nd_useropts = nd_opt; | |
262 | } else { | |
263 | /* | |
264 | * Unknown options must be silently ignored, | |
265 | * to accommodate future extension to the | |
266 | * protocol. | |
267 | */ | |
675418d5 JP |
268 | ND_PRINTK(2, notice, |
269 | "%s: ignored unsupported option; type=%d, len=%d\n", | |
270 | __func__, | |
271 | nd_opt->nd_opt_type, | |
272 | nd_opt->nd_opt_len); | |
31910575 | 273 | } |
1da177e4 | 274 | } |
f997c55c | 275 | next_opt: |
1da177e4 LT |
276 | opt_len -= l; |
277 | nd_opt = ((void *)nd_opt) + l; | |
278 | } | |
279 | return ndopts; | |
280 | } | |
281 | ||
b71d1d42 | 282 | int ndisc_mc_map(const struct in6_addr *addr, char *buf, struct net_device *dev, int dir) |
1da177e4 LT |
283 | { |
284 | switch (dev->type) { | |
285 | case ARPHRD_ETHER: | |
286 | case ARPHRD_IEEE802: /* Not sure. Check it later. --ANK */ | |
287 | case ARPHRD_FDDI: | |
288 | ipv6_eth_mc_map(addr, buf); | |
289 | return 0; | |
1da177e4 LT |
290 | case ARPHRD_ARCNET: |
291 | ipv6_arcnet_mc_map(addr, buf); | |
292 | return 0; | |
293 | case ARPHRD_INFINIBAND: | |
a9e527e3 | 294 | ipv6_ib_mc_map(addr, dev->broadcast, buf); |
1da177e4 | 295 | return 0; |
93ca3bb5 TT |
296 | case ARPHRD_IPGRE: |
297 | return ipv6_ipgre_mc_map(addr, dev->broadcast, buf); | |
1da177e4 LT |
298 | default: |
299 | if (dir) { | |
300 | memcpy(buf, dev->broadcast, dev->addr_len); | |
301 | return 0; | |
302 | } | |
303 | } | |
304 | return -EINVAL; | |
305 | } | |
7159039a YH |
306 | EXPORT_SYMBOL(ndisc_mc_map); |
307 | ||
d6bf7817 ED |
308 | static u32 ndisc_hash(const void *pkey, |
309 | const struct net_device *dev, | |
2c2aba6c | 310 | __u32 *hash_rnd) |
1da177e4 | 311 | { |
2c2aba6c | 312 | return ndisc_hashfn(pkey, dev, hash_rnd); |
1da177e4 LT |
313 | } |
314 | ||
60395a20 EB |
315 | static bool ndisc_key_eq(const struct neighbour *n, const void *pkey) |
316 | { | |
317 | return neigh_key_eq128(n, pkey); | |
318 | } | |
319 | ||
1da177e4 LT |
320 | static int ndisc_constructor(struct neighbour *neigh) |
321 | { | |
67ba4152 | 322 | struct in6_addr *addr = (struct in6_addr *)&neigh->primary_key; |
1da177e4 LT |
323 | struct net_device *dev = neigh->dev; |
324 | struct inet6_dev *in6_dev; | |
325 | struct neigh_parms *parms; | |
a50feda5 | 326 | bool is_multicast = ipv6_addr_is_multicast(addr); |
1da177e4 | 327 | |
1da177e4 | 328 | in6_dev = in6_dev_get(dev); |
63159f29 | 329 | if (!in6_dev) { |
1da177e4 LT |
330 | return -EINVAL; |
331 | } | |
332 | ||
333 | parms = in6_dev->nd_parms; | |
334 | __neigh_parms_put(neigh->parms); | |
335 | neigh->parms = neigh_parms_clone(parms); | |
1da177e4 LT |
336 | |
337 | neigh->type = is_multicast ? RTN_MULTICAST : RTN_UNICAST; | |
3b04ddde | 338 | if (!dev->header_ops) { |
1da177e4 LT |
339 | neigh->nud_state = NUD_NOARP; |
340 | neigh->ops = &ndisc_direct_ops; | |
8f40b161 | 341 | neigh->output = neigh_direct_output; |
1da177e4 LT |
342 | } else { |
343 | if (is_multicast) { | |
344 | neigh->nud_state = NUD_NOARP; | |
345 | ndisc_mc_map(addr, neigh->ha, dev, 1); | |
346 | } else if (dev->flags&(IFF_NOARP|IFF_LOOPBACK)) { | |
347 | neigh->nud_state = NUD_NOARP; | |
348 | memcpy(neigh->ha, dev->dev_addr, dev->addr_len); | |
349 | if (dev->flags&IFF_LOOPBACK) | |
350 | neigh->type = RTN_LOCAL; | |
351 | } else if (dev->flags&IFF_POINTOPOINT) { | |
352 | neigh->nud_state = NUD_NOARP; | |
353 | memcpy(neigh->ha, dev->broadcast, dev->addr_len); | |
354 | } | |
3b04ddde | 355 | if (dev->header_ops->cache) |
1da177e4 LT |
356 | neigh->ops = &ndisc_hh_ops; |
357 | else | |
358 | neigh->ops = &ndisc_generic_ops; | |
359 | if (neigh->nud_state&NUD_VALID) | |
360 | neigh->output = neigh->ops->connected_output; | |
361 | else | |
362 | neigh->output = neigh->ops->output; | |
363 | } | |
364 | in6_dev_put(in6_dev); | |
365 | return 0; | |
366 | } | |
367 | ||
368 | static int pndisc_constructor(struct pneigh_entry *n) | |
369 | { | |
67ba4152 | 370 | struct in6_addr *addr = (struct in6_addr *)&n->key; |
1da177e4 LT |
371 | struct in6_addr maddr; |
372 | struct net_device *dev = n->dev; | |
373 | ||
63159f29 | 374 | if (!dev || !__in6_dev_get(dev)) |
1da177e4 LT |
375 | return -EINVAL; |
376 | addrconf_addr_solict_mult(addr, &maddr); | |
377 | ipv6_dev_mc_inc(dev, &maddr); | |
378 | return 0; | |
379 | } | |
380 | ||
381 | static void pndisc_destructor(struct pneigh_entry *n) | |
382 | { | |
67ba4152 | 383 | struct in6_addr *addr = (struct in6_addr *)&n->key; |
1da177e4 LT |
384 | struct in6_addr maddr; |
385 | struct net_device *dev = n->dev; | |
386 | ||
63159f29 | 387 | if (!dev || !__in6_dev_get(dev)) |
1da177e4 LT |
388 | return; |
389 | addrconf_addr_solict_mult(addr, &maddr); | |
390 | ipv6_dev_mc_dec(dev, &maddr); | |
391 | } | |
392 | ||
de09334b YH |
393 | static struct sk_buff *ndisc_alloc_skb(struct net_device *dev, |
394 | int len) | |
395 | { | |
396 | int hlen = LL_RESERVED_SPACE(dev); | |
397 | int tlen = dev->needed_tailroom; | |
398 | struct sock *sk = dev_net(dev)->ipv6.ndisc_sk; | |
399 | struct sk_buff *skb; | |
de09334b | 400 | |
25a6e6b8 | 401 | skb = alloc_skb(hlen + sizeof(struct ipv6hdr) + len + tlen, GFP_ATOMIC); |
de09334b | 402 | if (!skb) { |
25a6e6b8 TG |
403 | ND_PRINTK(0, err, "ndisc: %s failed to allocate an skb\n", |
404 | __func__); | |
de09334b YH |
405 | return NULL; |
406 | } | |
407 | ||
f382d03a YH |
408 | skb->protocol = htons(ETH_P_IPV6); |
409 | skb->dev = dev; | |
410 | ||
527a150f | 411 | skb_reserve(skb, hlen + sizeof(struct ipv6hdr)); |
5135e633 | 412 | skb_reset_transport_header(skb); |
de09334b | 413 | |
25a6e6b8 TG |
414 | /* Manually assign socket ownership as we avoid calling |
415 | * sock_alloc_send_pskb() to bypass wmem buffer limits | |
416 | */ | |
417 | skb_set_owner_w(skb, sk); | |
418 | ||
de09334b YH |
419 | return skb; |
420 | } | |
421 | ||
f382d03a | 422 | static void ip6_nd_hdr(struct sk_buff *skb, |
2576f17d YH |
423 | const struct in6_addr *saddr, |
424 | const struct in6_addr *daddr, | |
c8d6c380 | 425 | int hop_limit, int len) |
2576f17d YH |
426 | { |
427 | struct ipv6hdr *hdr; | |
428 | ||
527a150f | 429 | skb_push(skb, sizeof(*hdr)); |
2576f17d | 430 | skb_reset_network_header(skb); |
2576f17d YH |
431 | hdr = ipv6_hdr(skb); |
432 | ||
433 | ip6_flow_hdr(hdr, 0, 0); | |
434 | ||
435 | hdr->payload_len = htons(len); | |
c8d6c380 YH |
436 | hdr->nexthdr = IPPROTO_ICMPV6; |
437 | hdr->hop_limit = hop_limit; | |
2576f17d YH |
438 | |
439 | hdr->saddr = *saddr; | |
440 | hdr->daddr = *daddr; | |
441 | } | |
442 | ||
af9a9976 | 443 | static void ndisc_send_skb(struct sk_buff *skb, |
fd0ea7db | 444 | const struct in6_addr *daddr, |
aa4bdd4b | 445 | const struct in6_addr *saddr) |
305d552a | 446 | { |
f4de84c6 | 447 | struct dst_entry *dst = skb_dst(skb); |
af9a9976 | 448 | struct net *net = dev_net(skb->dev); |
7b3d9b06 | 449 | struct sock *sk = net->ipv6.ndisc_sk; |
305d552a BH |
450 | struct inet6_dev *idev; |
451 | int err; | |
aa4bdd4b | 452 | struct icmp6hdr *icmp6h = icmp6_hdr(skb); |
305d552a BH |
453 | u8 type; |
454 | ||
455 | type = icmp6h->icmp6_type; | |
456 | ||
f4de84c6 | 457 | if (!dst) { |
f4de84c6 | 458 | struct flowi6 fl6; |
e0d56fdd | 459 | int oif = skb->dev->ifindex; |
305d552a | 460 | |
ca254490 | 461 | icmpv6_flow_init(sk, &fl6, type, saddr, daddr, oif); |
f4de84c6 YH |
462 | dst = icmp6_dst_alloc(skb->dev, &fl6); |
463 | if (IS_ERR(dst)) { | |
464 | kfree_skb(skb); | |
465 | return; | |
466 | } | |
467 | ||
468 | skb_dst_set(skb, dst); | |
469 | } | |
e1ec7842 | 470 | |
7b3d9b06 YH |
471 | icmp6h->icmp6_cksum = csum_ipv6_magic(saddr, daddr, skb->len, |
472 | IPPROTO_ICMPV6, | |
473 | csum_partial(icmp6h, | |
474 | skb->len, 0)); | |
475 | ||
476 | ip6_nd_hdr(skb, saddr, daddr, inet6_sk(sk)->hop_limit, skb->len); | |
477 | ||
cfdf7647 ED |
478 | rcu_read_lock(); |
479 | idev = __in6_dev_get(dst->dev); | |
edf391ff | 480 | IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len); |
e1ec7842 | 481 | |
29a26a56 EB |
482 | err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, |
483 | net, sk, skb, NULL, dst->dev, | |
13206b6b | 484 | dst_output); |
1da177e4 | 485 | if (!err) { |
5c5d244b | 486 | ICMP6MSGOUT_INC_STATS(net, idev, type); |
a862f6a6 | 487 | ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); |
1da177e4 LT |
488 | } |
489 | ||
cfdf7647 | 490 | rcu_read_unlock(); |
1ab1457c | 491 | } |
1da177e4 | 492 | |
38cf595b | 493 | void ndisc_send_na(struct net_device *dev, const struct in6_addr *daddr, |
f564f45c CW |
494 | const struct in6_addr *solicited_addr, |
495 | bool router, bool solicited, bool override, bool inc_opt) | |
e1ec7842 | 496 | { |
b44b5f4a | 497 | struct sk_buff *skb; |
e1ec7842 YH |
498 | struct in6_addr tmpaddr; |
499 | struct inet6_ifaddr *ifp; | |
9acd9f3a | 500 | const struct in6_addr *src_addr; |
1cb3fe51 YH |
501 | struct nd_msg *msg; |
502 | int optlen = 0; | |
e1ec7842 YH |
503 | |
504 | /* for anycast or proxy, solicited_addr != src_addr */ | |
c346dca1 | 505 | ifp = ipv6_get_ifaddr(dev_net(dev), solicited_addr, dev, 1); |
e1ec7842 YH |
506 | if (ifp) { |
507 | src_addr = solicited_addr; | |
508 | if (ifp->flags & IFA_F_OPTIMISTIC) | |
f2f79cca | 509 | override = false; |
9f888160 | 510 | inc_opt |= ifp->idev->cnf.force_tllao; |
e1ec7842 YH |
511 | in6_ifa_put(ifp); |
512 | } else { | |
191cd582 | 513 | if (ipv6_dev_get_saddr(dev_net(dev), dev, daddr, |
c346dca1 | 514 | inet6_sk(dev_net(dev)->ipv6.ndisc_sk)->srcprefs, |
7cbca67c | 515 | &tmpaddr)) |
e1ec7842 YH |
516 | return; |
517 | src_addr = &tmpaddr; | |
518 | } | |
519 | ||
1cb3fe51 YH |
520 | if (!dev->addr_len) |
521 | inc_opt = 0; | |
522 | if (inc_opt) | |
f997c55c AA |
523 | optlen += ndisc_opt_addr_space(dev, |
524 | NDISC_NEIGHBOUR_ADVERTISEMENT); | |
e1ec7842 | 525 | |
1cb3fe51 | 526 | skb = ndisc_alloc_skb(dev, sizeof(*msg) + optlen); |
b44b5f4a YH |
527 | if (!skb) |
528 | return; | |
529 | ||
1cb3fe51 YH |
530 | msg = (struct nd_msg *)skb_put(skb, sizeof(*msg)); |
531 | *msg = (struct nd_msg) { | |
532 | .icmph = { | |
533 | .icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT, | |
534 | .icmp6_router = router, | |
535 | .icmp6_solicited = solicited, | |
536 | .icmp6_override = override, | |
537 | }, | |
538 | .target = *solicited_addr, | |
539 | }; | |
540 | ||
541 | if (inc_opt) | |
542 | ndisc_fill_addr_option(skb, ND_OPT_TARGET_LL_ADDR, | |
f997c55c AA |
543 | dev->dev_addr, |
544 | NDISC_NEIGHBOUR_ADVERTISEMENT); | |
1cb3fe51 | 545 | |
b44b5f4a | 546 | ndisc_send_skb(skb, daddr, src_addr); |
e1ec7842 YH |
547 | } |
548 | ||
f47b9464 BH |
549 | static void ndisc_send_unsol_na(struct net_device *dev) |
550 | { | |
551 | struct inet6_dev *idev; | |
552 | struct inet6_ifaddr *ifa; | |
f47b9464 BH |
553 | |
554 | idev = in6_dev_get(dev); | |
555 | if (!idev) | |
556 | return; | |
557 | ||
558 | read_lock_bh(&idev->lock); | |
559 | list_for_each_entry(ifa, &idev->addr_list, if_list) { | |
38cf595b | 560 | ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifa->addr, |
f47b9464 BH |
561 | /*router=*/ !!idev->cnf.forwarding, |
562 | /*solicited=*/ false, /*override=*/ true, | |
563 | /*inc_opt=*/ true); | |
564 | } | |
565 | read_unlock_bh(&idev->lock); | |
566 | ||
567 | in6_dev_put(idev); | |
568 | } | |
569 | ||
38cf595b | 570 | void ndisc_send_ns(struct net_device *dev, const struct in6_addr *solicit, |
304d888b | 571 | const struct in6_addr *daddr, const struct in6_addr *saddr) |
1da177e4 | 572 | { |
b44b5f4a | 573 | struct sk_buff *skb; |
1da177e4 | 574 | struct in6_addr addr_buf; |
1cb3fe51 YH |
575 | int inc_opt = dev->addr_len; |
576 | int optlen = 0; | |
577 | struct nd_msg *msg; | |
1da177e4 | 578 | |
63159f29 | 579 | if (!saddr) { |
95c385b4 NH |
580 | if (ipv6_get_lladdr(dev, &addr_buf, |
581 | (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC))) | |
1da177e4 LT |
582 | return; |
583 | saddr = &addr_buf; | |
584 | } | |
585 | ||
1cb3fe51 | 586 | if (ipv6_addr_any(saddr)) |
f2f79cca | 587 | inc_opt = false; |
1cb3fe51 | 588 | if (inc_opt) |
f997c55c AA |
589 | optlen += ndisc_opt_addr_space(dev, |
590 | NDISC_NEIGHBOUR_SOLICITATION); | |
1cb3fe51 YH |
591 | |
592 | skb = ndisc_alloc_skb(dev, sizeof(*msg) + optlen); | |
b44b5f4a YH |
593 | if (!skb) |
594 | return; | |
595 | ||
1cb3fe51 YH |
596 | msg = (struct nd_msg *)skb_put(skb, sizeof(*msg)); |
597 | *msg = (struct nd_msg) { | |
598 | .icmph = { | |
599 | .icmp6_type = NDISC_NEIGHBOUR_SOLICITATION, | |
600 | }, | |
601 | .target = *solicit, | |
602 | }; | |
603 | ||
604 | if (inc_opt) | |
605 | ndisc_fill_addr_option(skb, ND_OPT_SOURCE_LL_ADDR, | |
f997c55c AA |
606 | dev->dev_addr, |
607 | NDISC_NEIGHBOUR_SOLICITATION); | |
1cb3fe51 | 608 | |
b44b5f4a | 609 | ndisc_send_skb(skb, daddr, saddr); |
1da177e4 LT |
610 | } |
611 | ||
9acd9f3a YH |
612 | void ndisc_send_rs(struct net_device *dev, const struct in6_addr *saddr, |
613 | const struct in6_addr *daddr) | |
1da177e4 | 614 | { |
b44b5f4a | 615 | struct sk_buff *skb; |
1cb3fe51 | 616 | struct rs_msg *msg; |
95c385b4 | 617 | int send_sllao = dev->addr_len; |
1cb3fe51 | 618 | int optlen = 0; |
95c385b4 NH |
619 | |
620 | #ifdef CONFIG_IPV6_OPTIMISTIC_DAD | |
621 | /* | |
622 | * According to section 2.2 of RFC 4429, we must not | |
623 | * send router solicitations with a sllao from | |
624 | * optimistic addresses, but we may send the solicitation | |
625 | * if we don't include the sllao. So here we check | |
626 | * if our address is optimistic, and if so, we | |
bea85195 | 627 | * suppress the inclusion of the sllao. |
95c385b4 NH |
628 | */ |
629 | if (send_sllao) { | |
c346dca1 | 630 | struct inet6_ifaddr *ifp = ipv6_get_ifaddr(dev_net(dev), saddr, |
1cab3da6 | 631 | dev, 1); |
95c385b4 NH |
632 | if (ifp) { |
633 | if (ifp->flags & IFA_F_OPTIMISTIC) { | |
ca043569 | 634 | send_sllao = 0; |
95c385b4 | 635 | } |
ca043569 | 636 | in6_ifa_put(ifp); |
95c385b4 NH |
637 | } else { |
638 | send_sllao = 0; | |
639 | } | |
640 | } | |
641 | #endif | |
1cb3fe51 | 642 | if (send_sllao) |
f997c55c | 643 | optlen += ndisc_opt_addr_space(dev, NDISC_ROUTER_SOLICITATION); |
1cb3fe51 YH |
644 | |
645 | skb = ndisc_alloc_skb(dev, sizeof(*msg) + optlen); | |
b44b5f4a YH |
646 | if (!skb) |
647 | return; | |
648 | ||
1cb3fe51 YH |
649 | msg = (struct rs_msg *)skb_put(skb, sizeof(*msg)); |
650 | *msg = (struct rs_msg) { | |
651 | .icmph = { | |
652 | .icmp6_type = NDISC_ROUTER_SOLICITATION, | |
653 | }, | |
654 | }; | |
655 | ||
656 | if (send_sllao) | |
657 | ndisc_fill_addr_option(skb, ND_OPT_SOURCE_LL_ADDR, | |
f997c55c AA |
658 | dev->dev_addr, |
659 | NDISC_ROUTER_SOLICITATION); | |
1cb3fe51 | 660 | |
b44b5f4a | 661 | ndisc_send_skb(skb, daddr, saddr); |
1da177e4 | 662 | } |
1ab1457c | 663 | |
1da177e4 LT |
664 | |
665 | static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb) | |
666 | { | |
667 | /* | |
668 | * "The sender MUST return an ICMP | |
669 | * destination unreachable" | |
670 | */ | |
671 | dst_link_failure(skb); | |
672 | kfree_skb(skb); | |
673 | } | |
674 | ||
675 | /* Called with locked neigh: either read or both */ | |
676 | ||
677 | static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb) | |
678 | { | |
679 | struct in6_addr *saddr = NULL; | |
680 | struct in6_addr mcaddr; | |
681 | struct net_device *dev = neigh->dev; | |
682 | struct in6_addr *target = (struct in6_addr *)&neigh->primary_key; | |
683 | int probes = atomic_read(&neigh->probes); | |
684 | ||
c58da4c6 EK |
685 | if (skb && ipv6_chk_addr_and_flags(dev_net(dev), &ipv6_hdr(skb)->saddr, |
686 | dev, 1, | |
687 | IFA_F_TENTATIVE|IFA_F_OPTIMISTIC)) | |
0660e03f | 688 | saddr = &ipv6_hdr(skb)->saddr; |
e5d08d71 IM |
689 | probes -= NEIGH_VAR(neigh->parms, UCAST_PROBES); |
690 | if (probes < 0) { | |
1da177e4 | 691 | if (!(neigh->nud_state & NUD_VALID)) { |
675418d5 JP |
692 | ND_PRINTK(1, dbg, |
693 | "%s: trying to ucast probe in NUD_INVALID: %pI6\n", | |
694 | __func__, target); | |
1da177e4 | 695 | } |
304d888b | 696 | ndisc_send_ns(dev, target, target, saddr); |
1f9248e5 | 697 | } else if ((probes -= NEIGH_VAR(neigh->parms, APP_PROBES)) < 0) { |
1da177e4 | 698 | neigh_app_ns(neigh); |
1da177e4 LT |
699 | } else { |
700 | addrconf_addr_solict_mult(target, &mcaddr); | |
304d888b | 701 | ndisc_send_ns(dev, target, &mcaddr, saddr); |
1da177e4 LT |
702 | } |
703 | } | |
704 | ||
0736ffc0 YH |
705 | static int pndisc_is_router(const void *pkey, |
706 | struct net_device *dev) | |
fa86d322 PE |
707 | { |
708 | struct pneigh_entry *n; | |
0736ffc0 | 709 | int ret = -1; |
fa86d322 PE |
710 | |
711 | read_lock_bh(&nd_tbl.lock); | |
0736ffc0 YH |
712 | n = __pneigh_lookup(&nd_tbl, dev_net(dev), pkey, dev); |
713 | if (n) | |
714 | ret = !!(n->flags & NTF_ROUTER); | |
fa86d322 PE |
715 | read_unlock_bh(&nd_tbl.lock); |
716 | ||
0736ffc0 | 717 | return ret; |
fa86d322 PE |
718 | } |
719 | ||
f997c55c AA |
720 | void ndisc_update(const struct net_device *dev, struct neighbour *neigh, |
721 | const u8 *lladdr, u8 new, u32 flags, u8 icmp6_type, | |
722 | struct ndisc_options *ndopts) | |
723 | { | |
724 | neigh_update(neigh, lladdr, new, flags); | |
725 | /* report ndisc ops about neighbour update */ | |
726 | ndisc_ops_update(dev, neigh, flags, icmp6_type, ndopts); | |
727 | } | |
728 | ||
1da177e4 LT |
729 | static void ndisc_recv_ns(struct sk_buff *skb) |
730 | { | |
9c70220b | 731 | struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb); |
b71d1d42 ED |
732 | const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; |
733 | const struct in6_addr *daddr = &ipv6_hdr(skb)->daddr; | |
1da177e4 | 734 | u8 *lladdr = NULL; |
29a3cad5 | 735 | u32 ndoptlen = skb_tail_pointer(skb) - (skb_transport_header(skb) + |
27a884dc | 736 | offsetof(struct nd_msg, opt)); |
1da177e4 LT |
737 | struct ndisc_options ndopts; |
738 | struct net_device *dev = skb->dev; | |
739 | struct inet6_ifaddr *ifp; | |
740 | struct inet6_dev *idev = NULL; | |
741 | struct neighbour *neigh; | |
742 | int dad = ipv6_addr_any(saddr); | |
a50feda5 | 743 | bool inc; |
0736ffc0 | 744 | int is_router = -1; |
1da177e4 | 745 | |
115b0aa6 YH |
746 | if (skb->len < sizeof(struct nd_msg)) { |
747 | ND_PRINTK(2, warn, "NS: packet too short\n"); | |
748 | return; | |
749 | } | |
750 | ||
1da177e4 | 751 | if (ipv6_addr_is_multicast(&msg->target)) { |
675418d5 | 752 | ND_PRINTK(2, warn, "NS: multicast target address\n"); |
1da177e4 LT |
753 | return; |
754 | } | |
755 | ||
756 | /* | |
757 | * RFC2461 7.1.1: | |
758 | * DAD has to be destined for solicited node multicast address. | |
759 | */ | |
ca97a644 | 760 | if (dad && !ipv6_addr_is_solict_mult(daddr)) { |
675418d5 | 761 | ND_PRINTK(2, warn, "NS: bad DAD packet (wrong destination)\n"); |
1da177e4 LT |
762 | return; |
763 | } | |
764 | ||
f997c55c | 765 | if (!ndisc_parse_options(dev, msg->opt, ndoptlen, &ndopts)) { |
675418d5 | 766 | ND_PRINTK(2, warn, "NS: invalid ND options\n"); |
1da177e4 LT |
767 | return; |
768 | } | |
769 | ||
770 | if (ndopts.nd_opts_src_lladdr) { | |
771 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, dev); | |
772 | if (!lladdr) { | |
675418d5 JP |
773 | ND_PRINTK(2, warn, |
774 | "NS: invalid link-layer address length\n"); | |
1da177e4 LT |
775 | return; |
776 | } | |
777 | ||
778 | /* RFC2461 7.1.1: | |
1ab1457c YH |
779 | * If the IP source address is the unspecified address, |
780 | * there MUST NOT be source link-layer address option | |
1da177e4 LT |
781 | * in the message. |
782 | */ | |
783 | if (dad) { | |
675418d5 JP |
784 | ND_PRINTK(2, warn, |
785 | "NS: bad DAD packet (link-layer address option)\n"); | |
1da177e4 LT |
786 | return; |
787 | } | |
788 | } | |
789 | ||
790 | inc = ipv6_addr_is_multicast(daddr); | |
791 | ||
c346dca1 | 792 | ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1); |
a18bc695 | 793 | if (ifp) { |
ca254490 | 794 | have_ifp: |
95c385b4 NH |
795 | if (ifp->flags & (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC)) { |
796 | if (dad) { | |
95c385b4 NH |
797 | /* |
798 | * We are colliding with another node | |
799 | * who is doing DAD | |
800 | * so fail our DAD process | |
801 | */ | |
802 | addrconf_dad_failure(ifp); | |
9e3be4b3 | 803 | return; |
95c385b4 NH |
804 | } else { |
805 | /* | |
806 | * This is not a dad solicitation. | |
807 | * If we are an optimistic node, | |
808 | * we should respond. | |
809 | * Otherwise, we should ignore it. | |
810 | */ | |
811 | if (!(ifp->flags & IFA_F_OPTIMISTIC)) | |
1da177e4 | 812 | goto out; |
1da177e4 | 813 | } |
1da177e4 LT |
814 | } |
815 | ||
816 | idev = ifp->idev; | |
817 | } else { | |
53b7997f YH |
818 | struct net *net = dev_net(dev); |
819 | ||
ca254490 DA |
820 | /* perhaps an address on the master device */ |
821 | if (netif_is_l3_slave(dev)) { | |
822 | struct net_device *mdev; | |
823 | ||
824 | mdev = netdev_master_upper_dev_get_rcu(dev); | |
825 | if (mdev) { | |
826 | ifp = ipv6_get_ifaddr(net, &msg->target, mdev, 1); | |
827 | if (ifp) | |
828 | goto have_ifp; | |
829 | } | |
830 | } | |
831 | ||
1da177e4 LT |
832 | idev = in6_dev_get(dev); |
833 | if (!idev) { | |
834 | /* XXX: count this drop? */ | |
835 | return; | |
836 | } | |
837 | ||
53b7997f | 838 | if (ipv6_chk_acast_addr(net, dev, &msg->target) || |
1ab1457c | 839 | (idev->cnf.forwarding && |
53b7997f | 840 | (net->ipv6.devconf_all->proxy_ndp || idev->cnf.proxy_ndp) && |
0736ffc0 | 841 | (is_router = pndisc_is_router(&msg->target, dev)) >= 0)) { |
a61bbcf2 | 842 | if (!(NEIGH_CB(skb)->flags & LOCALLY_ENQUEUED) && |
1da177e4 | 843 | skb->pkt_type != PACKET_HOST && |
f2f79cca | 844 | inc && |
1f9248e5 | 845 | NEIGH_VAR(idev->nd_parms, PROXY_DELAY) != 0) { |
1da177e4 LT |
846 | /* |
847 | * for anycast or proxy, | |
1ab1457c YH |
848 | * sender should delay its response |
849 | * by a random time between 0 and | |
1da177e4 LT |
850 | * MAX_ANYCAST_DELAY_TIME seconds. |
851 | * (RFC2461) -- yoshfuji | |
852 | */ | |
853 | struct sk_buff *n = skb_clone(skb, GFP_ATOMIC); | |
854 | if (n) | |
855 | pneigh_enqueue(&nd_tbl, idev->nd_parms, n); | |
856 | goto out; | |
857 | } | |
858 | } else | |
859 | goto out; | |
860 | } | |
861 | ||
0736ffc0 | 862 | if (is_router < 0) |
fb568637 | 863 | is_router = idev->cnf.forwarding; |
62dd9318 | 864 | |
1da177e4 | 865 | if (dad) { |
38cf595b | 866 | ndisc_send_na(dev, &in6addr_linklocal_allnodes, &msg->target, |
fb568637 | 867 | !!is_router, false, (ifp != NULL), true); |
1da177e4 LT |
868 | goto out; |
869 | } | |
870 | ||
871 | if (inc) | |
872 | NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_mcast); | |
873 | else | |
874 | NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_ucast); | |
875 | ||
1ab1457c | 876 | /* |
1da177e4 LT |
877 | * update / create cache entry |
878 | * for the source address | |
879 | */ | |
880 | neigh = __neigh_lookup(&nd_tbl, saddr, dev, | |
881 | !inc || lladdr || !dev->addr_len); | |
882 | if (neigh) | |
f997c55c | 883 | ndisc_update(dev, neigh, lladdr, NUD_STALE, |
1da177e4 | 884 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
f997c55c AA |
885 | NEIGH_UPDATE_F_OVERRIDE, |
886 | NDISC_NEIGHBOUR_SOLICITATION, &ndopts); | |
3b04ddde | 887 | if (neigh || !dev->header_ops) { |
38cf595b | 888 | ndisc_send_na(dev, saddr, &msg->target, !!is_router, |
fb568637 | 889 | true, (ifp != NULL && inc), inc); |
1da177e4 LT |
890 | if (neigh) |
891 | neigh_release(neigh); | |
892 | } | |
893 | ||
894 | out: | |
895 | if (ifp) | |
896 | in6_ifa_put(ifp); | |
897 | else | |
898 | in6_dev_put(idev); | |
1da177e4 LT |
899 | } |
900 | ||
901 | static void ndisc_recv_na(struct sk_buff *skb) | |
902 | { | |
9c70220b | 903 | struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb); |
be7a010d | 904 | struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; |
b71d1d42 | 905 | const struct in6_addr *daddr = &ipv6_hdr(skb)->daddr; |
1da177e4 | 906 | u8 *lladdr = NULL; |
29a3cad5 | 907 | u32 ndoptlen = skb_tail_pointer(skb) - (skb_transport_header(skb) + |
27a884dc | 908 | offsetof(struct nd_msg, opt)); |
1da177e4 LT |
909 | struct ndisc_options ndopts; |
910 | struct net_device *dev = skb->dev; | |
7a02bf89 | 911 | struct inet6_dev *idev = __in6_dev_get(dev); |
1da177e4 LT |
912 | struct inet6_ifaddr *ifp; |
913 | struct neighbour *neigh; | |
914 | ||
915 | if (skb->len < sizeof(struct nd_msg)) { | |
675418d5 | 916 | ND_PRINTK(2, warn, "NA: packet too short\n"); |
1da177e4 LT |
917 | return; |
918 | } | |
919 | ||
920 | if (ipv6_addr_is_multicast(&msg->target)) { | |
675418d5 | 921 | ND_PRINTK(2, warn, "NA: target address is multicast\n"); |
1da177e4 LT |
922 | return; |
923 | } | |
924 | ||
925 | if (ipv6_addr_is_multicast(daddr) && | |
926 | msg->icmph.icmp6_solicited) { | |
675418d5 | 927 | ND_PRINTK(2, warn, "NA: solicited NA is multicasted\n"); |
1da177e4 LT |
928 | return; |
929 | } | |
1ab1457c | 930 | |
7a02bf89 JB |
931 | /* For some 802.11 wireless deployments (and possibly other networks), |
932 | * there will be a NA proxy and unsolicitd packets are attacks | |
933 | * and thus should not be accepted. | |
934 | */ | |
935 | if (!msg->icmph.icmp6_solicited && idev && | |
936 | idev->cnf.drop_unsolicited_na) | |
937 | return; | |
938 | ||
f997c55c | 939 | if (!ndisc_parse_options(dev, msg->opt, ndoptlen, &ndopts)) { |
675418d5 | 940 | ND_PRINTK(2, warn, "NS: invalid ND option\n"); |
1da177e4 LT |
941 | return; |
942 | } | |
943 | if (ndopts.nd_opts_tgt_lladdr) { | |
944 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, dev); | |
945 | if (!lladdr) { | |
675418d5 JP |
946 | ND_PRINTK(2, warn, |
947 | "NA: invalid link-layer address length\n"); | |
1da177e4 LT |
948 | return; |
949 | } | |
950 | } | |
c346dca1 | 951 | ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1); |
a18bc695 | 952 | if (ifp) { |
bd015928 DW |
953 | if (skb->pkt_type != PACKET_LOOPBACK |
954 | && (ifp->flags & IFA_F_TENTATIVE)) { | |
955 | addrconf_dad_failure(ifp); | |
956 | return; | |
1da177e4 LT |
957 | } |
958 | /* What should we make now? The advertisement | |
959 | is invalid, but ndisc specs say nothing | |
960 | about it. It could be misconfiguration, or | |
961 | an smart proxy agent tries to help us :-) | |
24fc7b86 JS |
962 | |
963 | We should not print the error if NA has been | |
964 | received from loopback - it is just our own | |
965 | unsolicited advertisement. | |
1da177e4 | 966 | */ |
24fc7b86 | 967 | if (skb->pkt_type != PACKET_LOOPBACK) |
675418d5 JP |
968 | ND_PRINTK(1, warn, |
969 | "NA: someone advertises our address %pI6 on %s!\n", | |
970 | &ifp->addr, ifp->idev->dev->name); | |
1da177e4 LT |
971 | in6_ifa_put(ifp); |
972 | return; | |
973 | } | |
974 | neigh = neigh_lookup(&nd_tbl, &msg->target, dev); | |
975 | ||
976 | if (neigh) { | |
977 | u8 old_flags = neigh->flags; | |
53b7997f | 978 | struct net *net = dev_net(dev); |
1da177e4 LT |
979 | |
980 | if (neigh->nud_state & NUD_FAILED) | |
981 | goto out; | |
982 | ||
5f3e6e9e VN |
983 | /* |
984 | * Don't update the neighbor cache entry on a proxy NA from | |
985 | * ourselves because either the proxied node is off link or it | |
986 | * has already sent a NA to us. | |
987 | */ | |
988 | if (lladdr && !memcmp(lladdr, dev->dev_addr, dev->addr_len) && | |
53b7997f YH |
989 | net->ipv6.devconf_all->forwarding && net->ipv6.devconf_all->proxy_ndp && |
990 | pneigh_lookup(&nd_tbl, net, &msg->target, dev, 0)) { | |
b20b6d97 | 991 | /* XXX: idev->cnf.proxy_ndp */ |
5f3e6e9e | 992 | goto out; |
fbea49e1 | 993 | } |
5f3e6e9e | 994 | |
f997c55c | 995 | ndisc_update(dev, neigh, lladdr, |
1da177e4 LT |
996 | msg->icmph.icmp6_solicited ? NUD_REACHABLE : NUD_STALE, |
997 | NEIGH_UPDATE_F_WEAK_OVERRIDE| | |
998 | (msg->icmph.icmp6_override ? NEIGH_UPDATE_F_OVERRIDE : 0)| | |
999 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
f997c55c AA |
1000 | (msg->icmph.icmp6_router ? NEIGH_UPDATE_F_ISROUTER : 0), |
1001 | NDISC_NEIGHBOUR_ADVERTISEMENT, &ndopts); | |
1da177e4 LT |
1002 | |
1003 | if ((old_flags & ~neigh->flags) & NTF_ROUTER) { | |
1004 | /* | |
1005 | * Change: router to host | |
1006 | */ | |
be7a010d | 1007 | rt6_clean_tohost(dev_net(dev), saddr); |
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 | 1029 | if (!idev) { |
675418d5 | 1030 | ND_PRINTK(1, err, "RS: can't find in6 device\n"); |
1da177e4 LT |
1031 | return; |
1032 | } | |
1033 | ||
1034 | /* Don't accept RS if we're not in router mode */ | |
1035 | if (!idev->cnf.forwarding) | |
1036 | goto out; | |
1037 | ||
1038 | /* | |
1039 | * Don't update NCE if src = ::; | |
1040 | * this implies that the source node has no ip address assigned yet. | |
1041 | */ | |
1042 | if (ipv6_addr_any(saddr)) | |
1043 | goto out; | |
1044 | ||
1045 | /* Parse ND options */ | |
f997c55c | 1046 | if (!ndisc_parse_options(skb->dev, rs_msg->opt, ndoptlen, &ndopts)) { |
675418d5 | 1047 | ND_PRINTK(2, notice, "NS: invalid ND option, ignored\n"); |
1da177e4 LT |
1048 | goto out; |
1049 | } | |
1050 | ||
1051 | if (ndopts.nd_opts_src_lladdr) { | |
1052 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, | |
1053 | skb->dev); | |
1054 | if (!lladdr) | |
1055 | goto out; | |
1056 | } | |
1057 | ||
1058 | neigh = __neigh_lookup(&nd_tbl, saddr, skb->dev, 1); | |
1059 | if (neigh) { | |
f997c55c | 1060 | ndisc_update(skb->dev, neigh, lladdr, NUD_STALE, |
1da177e4 LT |
1061 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
1062 | NEIGH_UPDATE_F_OVERRIDE| | |
f997c55c AA |
1063 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER, |
1064 | NDISC_ROUTER_SOLICITATION, &ndopts); | |
1da177e4 LT |
1065 | neigh_release(neigh); |
1066 | } | |
1067 | out: | |
cfdf7647 | 1068 | return; |
1da177e4 LT |
1069 | } |
1070 | ||
31910575 PY |
1071 | static void ndisc_ra_useropt(struct sk_buff *ra, struct nd_opt_hdr *opt) |
1072 | { | |
1073 | struct icmp6hdr *icmp6h = (struct icmp6hdr *)skb_transport_header(ra); | |
1074 | struct sk_buff *skb; | |
1075 | struct nlmsghdr *nlh; | |
1076 | struct nduseroptmsg *ndmsg; | |
c346dca1 | 1077 | struct net *net = dev_net(ra->dev); |
31910575 PY |
1078 | int err; |
1079 | int base_size = NLMSG_ALIGN(sizeof(struct nduseroptmsg) | |
1080 | + (opt->nd_opt_len << 3)); | |
1081 | size_t msg_size = base_size + nla_total_size(sizeof(struct in6_addr)); | |
1082 | ||
1083 | skb = nlmsg_new(msg_size, GFP_ATOMIC); | |
63159f29 | 1084 | if (!skb) { |
31910575 PY |
1085 | err = -ENOBUFS; |
1086 | goto errout; | |
1087 | } | |
1088 | ||
1089 | nlh = nlmsg_put(skb, 0, 0, RTM_NEWNDUSEROPT, base_size, 0); | |
63159f29 | 1090 | if (!nlh) { |
31910575 PY |
1091 | goto nla_put_failure; |
1092 | } | |
1093 | ||
1094 | ndmsg = nlmsg_data(nlh); | |
1095 | ndmsg->nduseropt_family = AF_INET6; | |
dbb2ed24 | 1096 | ndmsg->nduseropt_ifindex = ra->dev->ifindex; |
31910575 PY |
1097 | ndmsg->nduseropt_icmp_type = icmp6h->icmp6_type; |
1098 | ndmsg->nduseropt_icmp_code = icmp6h->icmp6_code; | |
1099 | ndmsg->nduseropt_opts_len = opt->nd_opt_len << 3; | |
1100 | ||
1101 | memcpy(ndmsg + 1, opt, opt->nd_opt_len << 3); | |
1102 | ||
930345ea | 1103 | if (nla_put_in6_addr(skb, NDUSEROPT_SRCADDR, &ipv6_hdr(ra)->saddr)) |
c78679e8 | 1104 | goto nla_put_failure; |
31910575 PY |
1105 | nlmsg_end(skb, nlh); |
1106 | ||
1ce85fe4 | 1107 | rtnl_notify(skb, net, 0, RTNLGRP_ND_USEROPT, NULL, GFP_ATOMIC); |
31910575 PY |
1108 | return; |
1109 | ||
1110 | nla_put_failure: | |
1111 | nlmsg_free(skb); | |
1112 | err = -EMSGSIZE; | |
1113 | errout: | |
a18bc695 | 1114 | rtnl_set_sk_err(net, RTNLGRP_ND_USEROPT, err); |
31910575 PY |
1115 | } |
1116 | ||
1da177e4 LT |
1117 | static void ndisc_router_discovery(struct sk_buff *skb) |
1118 | { | |
9c70220b | 1119 | struct ra_msg *ra_msg = (struct ra_msg *)skb_transport_header(skb); |
1da177e4 LT |
1120 | struct neighbour *neigh = NULL; |
1121 | struct inet6_dev *in6_dev; | |
65f5c7c1 | 1122 | struct rt6_info *rt = NULL; |
1da177e4 LT |
1123 | int lifetime; |
1124 | struct ndisc_options ndopts; | |
1125 | int optlen; | |
ebacaaa0 | 1126 | unsigned int pref = 0; |
a394eef5 | 1127 | __u32 old_if_flags; |
2053aeb6 | 1128 | bool send_ifinfo_notify = false; |
1da177e4 | 1129 | |
67ba4152 | 1130 | __u8 *opt = (__u8 *)(ra_msg + 1); |
1da177e4 | 1131 | |
29a3cad5 SH |
1132 | optlen = (skb_tail_pointer(skb) - skb_transport_header(skb)) - |
1133 | sizeof(struct ra_msg); | |
1da177e4 | 1134 | |
f2a762d8 BG |
1135 | ND_PRINTK(2, info, |
1136 | "RA: %s, dev: %s\n", | |
1137 | __func__, skb->dev->name); | |
0660e03f | 1138 | if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) { |
675418d5 | 1139 | ND_PRINTK(2, warn, "RA: source address is not link-local\n"); |
1da177e4 LT |
1140 | return; |
1141 | } | |
1142 | if (optlen < 0) { | |
675418d5 | 1143 | ND_PRINTK(2, warn, "RA: packet too short\n"); |
1da177e4 LT |
1144 | return; |
1145 | } | |
1146 | ||
de357cc0 | 1147 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 | 1148 | if (skb->ndisc_nodetype == NDISC_NODETYPE_HOST) { |
675418d5 | 1149 | ND_PRINTK(2, warn, "RA: from host or unauthorized router\n"); |
fadf6bf0 TF |
1150 | return; |
1151 | } | |
de357cc0 | 1152 | #endif |
fadf6bf0 | 1153 | |
1da177e4 LT |
1154 | /* |
1155 | * set the RA_RECV flag in the interface | |
1156 | */ | |
1157 | ||
cfdf7647 | 1158 | in6_dev = __in6_dev_get(skb->dev); |
63159f29 | 1159 | if (!in6_dev) { |
675418d5 JP |
1160 | ND_PRINTK(0, err, "RA: can't find inet6 device for %s\n", |
1161 | skb->dev->name); | |
1da177e4 LT |
1162 | return; |
1163 | } | |
1da177e4 | 1164 | |
f997c55c | 1165 | if (!ndisc_parse_options(skb->dev, opt, optlen, &ndopts)) { |
675418d5 | 1166 | ND_PRINTK(2, warn, "RA: invalid ND options\n"); |
1da177e4 LT |
1167 | return; |
1168 | } | |
1169 | ||
f2a762d8 BG |
1170 | if (!ipv6_accept_ra(in6_dev)) { |
1171 | ND_PRINTK(2, info, | |
1172 | "RA: %s, did not accept ra for dev: %s\n", | |
1173 | __func__, skb->dev->name); | |
31ce8c71 | 1174 | goto skip_linkparms; |
f2a762d8 | 1175 | } |
31ce8c71 | 1176 | |
de357cc0 | 1177 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 | 1178 | /* skip link-specific parameters from interior routers */ |
f2a762d8 BG |
1179 | if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT) { |
1180 | ND_PRINTK(2, info, | |
1181 | "RA: %s, nodetype is NODEFAULT, dev: %s\n", | |
1182 | __func__, skb->dev->name); | |
fadf6bf0 | 1183 | goto skip_linkparms; |
f2a762d8 | 1184 | } |
de357cc0 | 1185 | #endif |
fadf6bf0 | 1186 | |
1da177e4 LT |
1187 | if (in6_dev->if_flags & IF_RS_SENT) { |
1188 | /* | |
1189 | * flag that an RA was received after an RS was sent | |
1190 | * out on this interface. | |
1191 | */ | |
1192 | in6_dev->if_flags |= IF_RA_RCVD; | |
1193 | } | |
1194 | ||
1195 | /* | |
1196 | * Remember the managed/otherconf flags from most recently | |
1197 | * received RA message (RFC 2462) -- yoshfuji | |
1198 | */ | |
a394eef5 | 1199 | old_if_flags = in6_dev->if_flags; |
1da177e4 LT |
1200 | in6_dev->if_flags = (in6_dev->if_flags & ~(IF_RA_MANAGED | |
1201 | IF_RA_OTHERCONF)) | | |
1202 | (ra_msg->icmph.icmp6_addrconf_managed ? | |
1203 | IF_RA_MANAGED : 0) | | |
1204 | (ra_msg->icmph.icmp6_addrconf_other ? | |
1205 | IF_RA_OTHERCONF : 0); | |
1206 | ||
a394eef5 | 1207 | if (old_if_flags != in6_dev->if_flags) |
2053aeb6 | 1208 | send_ifinfo_notify = true; |
a394eef5 | 1209 | |
f2a762d8 BG |
1210 | if (!in6_dev->cnf.accept_ra_defrtr) { |
1211 | ND_PRINTK(2, info, | |
1212 | "RA: %s, defrtr is false for dev: %s\n", | |
1213 | __func__, skb->dev->name); | |
65f5c7c1 | 1214 | goto skip_defrtr; |
f2a762d8 | 1215 | } |
65f5c7c1 | 1216 | |
d9333196 BG |
1217 | /* Do not accept RA with source-addr found on local machine unless |
1218 | * accept_ra_from_local is set to true. | |
1219 | */ | |
b6428817 LR |
1220 | if (!in6_dev->cnf.accept_ra_from_local && |
1221 | ipv6_chk_addr(dev_net(in6_dev->dev), &ipv6_hdr(skb)->saddr, | |
c1a9a291 | 1222 | in6_dev->dev, 0)) { |
f2a762d8 | 1223 | ND_PRINTK(2, info, |
d9333196 BG |
1224 | "RA from local address detected on dev: %s: default router ignored\n", |
1225 | skb->dev->name); | |
9f56220f | 1226 | goto skip_defrtr; |
f2a762d8 | 1227 | } |
9f56220f | 1228 | |
1da177e4 LT |
1229 | lifetime = ntohs(ra_msg->icmph.icmp6_rt_lifetime); |
1230 | ||
ebacaaa0 YH |
1231 | #ifdef CONFIG_IPV6_ROUTER_PREF |
1232 | pref = ra_msg->icmph.icmp6_router_pref; | |
1233 | /* 10b is handled as if it were 00b (medium) */ | |
930d6ff2 | 1234 | if (pref == ICMPV6_ROUTER_PREF_INVALID || |
6d5b78cd | 1235 | !in6_dev->cnf.accept_ra_rtr_pref) |
ebacaaa0 YH |
1236 | pref = ICMPV6_ROUTER_PREF_MEDIUM; |
1237 | #endif | |
1238 | ||
0660e03f | 1239 | rt = rt6_get_dflt_router(&ipv6_hdr(skb)->saddr, skb->dev); |
1da177e4 | 1240 | |
eb857186 DM |
1241 | if (rt) { |
1242 | neigh = dst_neigh_lookup(&rt->dst, &ipv6_hdr(skb)->saddr); | |
1243 | if (!neigh) { | |
675418d5 JP |
1244 | ND_PRINTK(0, err, |
1245 | "RA: %s got default router without neighbour\n", | |
1246 | __func__); | |
94e187c0 | 1247 | ip6_rt_put(rt); |
eb857186 DM |
1248 | return; |
1249 | } | |
1250 | } | |
1da177e4 | 1251 | if (rt && lifetime == 0) { |
e0a1ad73 | 1252 | ip6_del_rt(rt); |
1da177e4 LT |
1253 | rt = NULL; |
1254 | } | |
1255 | ||
f2a762d8 BG |
1256 | ND_PRINTK(3, info, "RA: rt: %p lifetime: %d, for dev: %s\n", |
1257 | rt, lifetime, skb->dev->name); | |
63159f29 | 1258 | if (!rt && lifetime) { |
f2a762d8 | 1259 | ND_PRINTK(3, info, "RA: adding default router\n"); |
1da177e4 | 1260 | |
0660e03f | 1261 | rt = rt6_add_dflt_router(&ipv6_hdr(skb)->saddr, skb->dev, pref); |
63159f29 | 1262 | if (!rt) { |
675418d5 JP |
1263 | ND_PRINTK(0, err, |
1264 | "RA: %s failed to add default route\n", | |
1265 | __func__); | |
1da177e4 LT |
1266 | return; |
1267 | } | |
1268 | ||
eb857186 | 1269 | neigh = dst_neigh_lookup(&rt->dst, &ipv6_hdr(skb)->saddr); |
63159f29 | 1270 | if (!neigh) { |
675418d5 JP |
1271 | ND_PRINTK(0, err, |
1272 | "RA: %s got default router without neighbour\n", | |
1273 | __func__); | |
94e187c0 | 1274 | ip6_rt_put(rt); |
1da177e4 LT |
1275 | return; |
1276 | } | |
1277 | neigh->flags |= NTF_ROUTER; | |
ebacaaa0 | 1278 | } else if (rt) { |
22441cfa | 1279 | rt->rt6i_flags = (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); |
1da177e4 LT |
1280 | } |
1281 | ||
1282 | if (rt) | |
1716a961 | 1283 | rt6_set_expires(rt, jiffies + (HZ * lifetime)); |
8013d1d7 HL |
1284 | if (in6_dev->cnf.accept_ra_min_hop_limit < 256 && |
1285 | ra_msg->icmph.icmp6_hop_limit) { | |
1286 | if (in6_dev->cnf.accept_ra_min_hop_limit <= ra_msg->icmph.icmp6_hop_limit) { | |
6fd99094 | 1287 | in6_dev->cnf.hop_limit = ra_msg->icmph.icmp6_hop_limit; |
8013d1d7 HL |
1288 | if (rt) |
1289 | dst_metric_set(&rt->dst, RTAX_HOPLIMIT, | |
1290 | ra_msg->icmph.icmp6_hop_limit); | |
6fd99094 | 1291 | } else { |
8013d1d7 | 1292 | ND_PRINTK(2, warn, "RA: Got route advertisement with lower hop_limit than minimum\n"); |
6fd99094 | 1293 | } |
1da177e4 LT |
1294 | } |
1295 | ||
65f5c7c1 YH |
1296 | skip_defrtr: |
1297 | ||
1da177e4 LT |
1298 | /* |
1299 | * Update Reachable Time and Retrans Timer | |
1300 | */ | |
1301 | ||
1302 | if (in6_dev->nd_parms) { | |
1303 | unsigned long rtime = ntohl(ra_msg->retrans_timer); | |
1304 | ||
1305 | if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/HZ) { | |
1306 | rtime = (rtime*HZ)/1000; | |
1307 | if (rtime < HZ/10) | |
1308 | rtime = HZ/10; | |
1f9248e5 | 1309 | NEIGH_VAR_SET(in6_dev->nd_parms, RETRANS_TIME, rtime); |
1da177e4 | 1310 | in6_dev->tstamp = jiffies; |
2053aeb6 | 1311 | send_ifinfo_notify = true; |
1da177e4 LT |
1312 | } |
1313 | ||
1314 | rtime = ntohl(ra_msg->reachable_time); | |
1315 | if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/(3*HZ)) { | |
1316 | rtime = (rtime*HZ)/1000; | |
1317 | ||
1318 | if (rtime < HZ/10) | |
1319 | rtime = HZ/10; | |
1320 | ||
1f9248e5 JP |
1321 | if (rtime != NEIGH_VAR(in6_dev->nd_parms, BASE_REACHABLE_TIME)) { |
1322 | NEIGH_VAR_SET(in6_dev->nd_parms, | |
1323 | BASE_REACHABLE_TIME, rtime); | |
1324 | NEIGH_VAR_SET(in6_dev->nd_parms, | |
1325 | GC_STALETIME, 3 * rtime); | |
1da177e4 LT |
1326 | in6_dev->nd_parms->reachable_time = neigh_rand_reach_time(rtime); |
1327 | in6_dev->tstamp = jiffies; | |
2053aeb6 | 1328 | send_ifinfo_notify = true; |
1da177e4 LT |
1329 | } |
1330 | } | |
1331 | } | |
1332 | ||
2053aeb6 MT |
1333 | /* |
1334 | * Send a notify if RA changed managed/otherconf flags or timer settings | |
1335 | */ | |
1336 | if (send_ifinfo_notify) | |
1337 | inet6_ifinfo_notify(RTM_NEWLINK, in6_dev); | |
1338 | ||
fadf6bf0 TF |
1339 | skip_linkparms: |
1340 | ||
1da177e4 LT |
1341 | /* |
1342 | * Process options. | |
1343 | */ | |
1344 | ||
1345 | if (!neigh) | |
0660e03f | 1346 | neigh = __neigh_lookup(&nd_tbl, &ipv6_hdr(skb)->saddr, |
1da177e4 LT |
1347 | skb->dev, 1); |
1348 | if (neigh) { | |
1349 | u8 *lladdr = NULL; | |
1350 | if (ndopts.nd_opts_src_lladdr) { | |
1351 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, | |
1352 | skb->dev); | |
1353 | if (!lladdr) { | |
675418d5 JP |
1354 | ND_PRINTK(2, warn, |
1355 | "RA: invalid link-layer address length\n"); | |
1da177e4 LT |
1356 | goto out; |
1357 | } | |
1358 | } | |
f997c55c | 1359 | ndisc_update(skb->dev, neigh, lladdr, NUD_STALE, |
1da177e4 LT |
1360 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
1361 | NEIGH_UPDATE_F_OVERRIDE| | |
1362 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
f997c55c AA |
1363 | NEIGH_UPDATE_F_ISROUTER, |
1364 | NDISC_ROUTER_ADVERTISEMENT, &ndopts); | |
1da177e4 LT |
1365 | } |
1366 | ||
f2a762d8 BG |
1367 | if (!ipv6_accept_ra(in6_dev)) { |
1368 | ND_PRINTK(2, info, | |
1369 | "RA: %s, accept_ra is false for dev: %s\n", | |
1370 | __func__, skb->dev->name); | |
31ce8c71 | 1371 | goto out; |
f2a762d8 | 1372 | } |
31ce8c71 | 1373 | |
70ceb4f5 | 1374 | #ifdef CONFIG_IPV6_ROUTE_INFO |
b6428817 LR |
1375 | if (!in6_dev->cnf.accept_ra_from_local && |
1376 | ipv6_chk_addr(dev_net(in6_dev->dev), &ipv6_hdr(skb)->saddr, | |
c1a9a291 | 1377 | in6_dev->dev, 0)) { |
f2a762d8 | 1378 | ND_PRINTK(2, info, |
d9333196 BG |
1379 | "RA from local address detected on dev: %s: router info ignored.\n", |
1380 | skb->dev->name); | |
9f56220f | 1381 | goto skip_routeinfo; |
f2a762d8 | 1382 | } |
9f56220f | 1383 | |
09c884d4 | 1384 | if (in6_dev->cnf.accept_ra_rtr_pref && ndopts.nd_opts_ri) { |
70ceb4f5 YH |
1385 | struct nd_opt_hdr *p; |
1386 | for (p = ndopts.nd_opts_ri; | |
1387 | p; | |
1388 | p = ndisc_next_option(p, ndopts.nd_opts_ri_end)) { | |
6294e000 YH |
1389 | struct route_info *ri = (struct route_info *)p; |
1390 | #ifdef CONFIG_IPV6_NDISC_NODETYPE | |
1391 | if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT && | |
1392 | ri->prefix_len == 0) | |
1393 | continue; | |
1394 | #endif | |
30e56918 DJ |
1395 | if (ri->prefix_len == 0 && |
1396 | !in6_dev->cnf.accept_ra_defrtr) | |
1397 | continue; | |
6294e000 | 1398 | if (ri->prefix_len > in6_dev->cnf.accept_ra_rt_info_max_plen) |
09c884d4 | 1399 | continue; |
67ba4152 | 1400 | rt6_route_rcv(skb->dev, (u8 *)p, (p->nd_opt_len) << 3, |
0660e03f | 1401 | &ipv6_hdr(skb)->saddr); |
70ceb4f5 YH |
1402 | } |
1403 | } | |
9f56220f AH |
1404 | |
1405 | skip_routeinfo: | |
70ceb4f5 YH |
1406 | #endif |
1407 | ||
de357cc0 | 1408 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 | 1409 | /* skip link-specific ndopts from interior routers */ |
f2a762d8 BG |
1410 | if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT) { |
1411 | ND_PRINTK(2, info, | |
1412 | "RA: %s, nodetype is NODEFAULT (interior routes), dev: %s\n", | |
1413 | __func__, skb->dev->name); | |
fadf6bf0 | 1414 | goto out; |
f2a762d8 | 1415 | } |
de357cc0 | 1416 | #endif |
fadf6bf0 | 1417 | |
c4fd30eb | 1418 | if (in6_dev->cnf.accept_ra_pinfo && ndopts.nd_opts_pi) { |
1da177e4 LT |
1419 | struct nd_opt_hdr *p; |
1420 | for (p = ndopts.nd_opts_pi; | |
1421 | p; | |
1422 | p = ndisc_next_option(p, ndopts.nd_opts_pi_end)) { | |
e6bff995 NH |
1423 | addrconf_prefix_rcv(skb->dev, (u8 *)p, |
1424 | (p->nd_opt_len) << 3, | |
1425 | ndopts.nd_opts_src_lladdr != NULL); | |
1da177e4 LT |
1426 | } |
1427 | } | |
1428 | ||
c2943f14 | 1429 | if (ndopts.nd_opts_mtu && in6_dev->cnf.accept_ra_mtu) { |
e69a4adc | 1430 | __be32 n; |
1da177e4 LT |
1431 | u32 mtu; |
1432 | ||
67ba4152 | 1433 | memcpy(&n, ((u8 *)(ndopts.nd_opts_mtu+1))+2, sizeof(mtu)); |
e69a4adc | 1434 | mtu = ntohl(n); |
1da177e4 LT |
1435 | |
1436 | if (mtu < IPV6_MIN_MTU || mtu > skb->dev->mtu) { | |
675418d5 | 1437 | ND_PRINTK(2, warn, "RA: invalid mtu: %d\n", mtu); |
1da177e4 LT |
1438 | } else if (in6_dev->cnf.mtu6 != mtu) { |
1439 | in6_dev->cnf.mtu6 = mtu; | |
1440 | ||
1441 | if (rt) | |
defb3519 | 1442 | dst_metric_set(&rt->dst, RTAX_MTU, mtu); |
1da177e4 LT |
1443 | |
1444 | rt6_mtu_change(skb->dev, mtu); | |
1445 | } | |
1446 | } | |
1ab1457c | 1447 | |
31910575 | 1448 | if (ndopts.nd_useropts) { |
61cf46ad YH |
1449 | struct nd_opt_hdr *p; |
1450 | for (p = ndopts.nd_useropts; | |
1451 | p; | |
f997c55c AA |
1452 | p = ndisc_next_useropt(skb->dev, p, |
1453 | ndopts.nd_useropts_end)) { | |
61cf46ad | 1454 | ndisc_ra_useropt(skb, p); |
31910575 PY |
1455 | } |
1456 | } | |
1457 | ||
1da177e4 | 1458 | if (ndopts.nd_opts_tgt_lladdr || ndopts.nd_opts_rh) { |
675418d5 | 1459 | ND_PRINTK(2, warn, "RA: invalid RA options\n"); |
1da177e4 LT |
1460 | } |
1461 | out: | |
94e187c0 | 1462 | ip6_rt_put(rt); |
eb857186 | 1463 | if (neigh) |
1da177e4 | 1464 | neigh_release(neigh); |
1da177e4 LT |
1465 | } |
1466 | ||
1467 | static void ndisc_redirect_rcv(struct sk_buff *skb) | |
1468 | { | |
093d04d4 DJ |
1469 | u8 *hdr; |
1470 | struct ndisc_options ndopts; | |
1471 | struct rd_msg *msg = (struct rd_msg *)skb_transport_header(skb); | |
29a3cad5 | 1472 | u32 ndoptlen = skb_tail_pointer(skb) - (skb_transport_header(skb) + |
093d04d4 DJ |
1473 | offsetof(struct rd_msg, opt)); |
1474 | ||
de357cc0 | 1475 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 TF |
1476 | switch (skb->ndisc_nodetype) { |
1477 | case NDISC_NODETYPE_HOST: | |
1478 | case NDISC_NODETYPE_NODEFAULT: | |
675418d5 JP |
1479 | ND_PRINTK(2, warn, |
1480 | "Redirect: from host or unauthorized router\n"); | |
fadf6bf0 TF |
1481 | return; |
1482 | } | |
de357cc0 | 1483 | #endif |
fadf6bf0 | 1484 | |
0660e03f | 1485 | if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) { |
675418d5 JP |
1486 | ND_PRINTK(2, warn, |
1487 | "Redirect: source address is not link-local\n"); | |
1da177e4 LT |
1488 | return; |
1489 | } | |
1490 | ||
f997c55c | 1491 | if (!ndisc_parse_options(skb->dev, msg->opt, ndoptlen, &ndopts)) |
093d04d4 DJ |
1492 | return; |
1493 | ||
c92a59ec | 1494 | if (!ndopts.nd_opts_rh) { |
b55b76b2 DJ |
1495 | ip6_redirect_no_header(skb, dev_net(skb->dev), |
1496 | skb->dev->ifindex, 0); | |
093d04d4 | 1497 | return; |
c92a59ec | 1498 | } |
093d04d4 DJ |
1499 | |
1500 | hdr = (u8 *)ndopts.nd_opts_rh; | |
1501 | hdr += 8; | |
1502 | if (!pskb_pull(skb, hdr - skb_transport_header(skb))) | |
1503 | return; | |
1504 | ||
b94f1c09 | 1505 | icmpv6_notify(skb, NDISC_REDIRECT, 0, 0); |
1da177e4 LT |
1506 | } |
1507 | ||
5f5a0115 YH |
1508 | static void ndisc_fill_redirect_hdr_option(struct sk_buff *skb, |
1509 | struct sk_buff *orig_skb, | |
1510 | int rd_len) | |
9c86dafe | 1511 | { |
5f5a0115 YH |
1512 | u8 *opt = skb_put(skb, rd_len); |
1513 | ||
9c86dafe YH |
1514 | memset(opt, 0, 8); |
1515 | *(opt++) = ND_OPT_REDIRECT_HDR; | |
1516 | *(opt++) = (rd_len >> 3); | |
1517 | opt += 6; | |
1518 | ||
1519 | memcpy(opt, ipv6_hdr(orig_skb), rd_len - 8); | |
9c86dafe YH |
1520 | } |
1521 | ||
4991969a | 1522 | void ndisc_send_redirect(struct sk_buff *skb, const struct in6_addr *target) |
1da177e4 | 1523 | { |
1762f7e8 | 1524 | struct net_device *dev = skb->dev; |
c346dca1 | 1525 | struct net *net = dev_net(dev); |
1762f7e8 | 1526 | struct sock *sk = net->ipv6.ndisc_sk; |
2ce13576 | 1527 | int optlen = 0; |
fbfe95a4 | 1528 | struct inet_peer *peer; |
1da177e4 | 1529 | struct sk_buff *buff; |
71bcdba0 | 1530 | struct rd_msg *msg; |
1da177e4 | 1531 | struct in6_addr saddr_buf; |
1da177e4 LT |
1532 | struct rt6_info *rt; |
1533 | struct dst_entry *dst; | |
4c9483b2 | 1534 | struct flowi6 fl6; |
1da177e4 | 1535 | int rd_len; |
f997c55c AA |
1536 | u8 ha_buf[MAX_ADDR_LEN], *ha = NULL, |
1537 | ops_data_buf[NDISC_OPS_REDIRECT_DATA_SPACE], *ops_data = NULL; | |
1d861aa4 | 1538 | bool ret; |
1da177e4 | 1539 | |
95c385b4 | 1540 | if (ipv6_get_lladdr(dev, &saddr_buf, IFA_F_TENTATIVE)) { |
675418d5 JP |
1541 | ND_PRINTK(2, warn, "Redirect: no link-local address on %s\n", |
1542 | dev->name); | |
1ab1457c YH |
1543 | return; |
1544 | } | |
1da177e4 | 1545 | |
0660e03f | 1546 | if (!ipv6_addr_equal(&ipv6_hdr(skb)->daddr, target) && |
bf0b48df | 1547 | ipv6_addr_type(target) != (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) { |
675418d5 JP |
1548 | ND_PRINTK(2, warn, |
1549 | "Redirect: target address is not link-local unicast\n"); | |
29556526 LY |
1550 | return; |
1551 | } | |
1552 | ||
4c9483b2 | 1553 | icmpv6_flow_init(sk, &fl6, NDISC_REDIRECT, |
e0d56fdd | 1554 | &saddr_buf, &ipv6_hdr(skb)->saddr, dev->ifindex); |
1da177e4 | 1555 | |
4c9483b2 | 1556 | dst = ip6_route_output(net, NULL, &fl6); |
5095d64d RL |
1557 | if (dst->error) { |
1558 | dst_release(dst); | |
1da177e4 | 1559 | return; |
5095d64d | 1560 | } |
4c9483b2 | 1561 | dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), NULL, 0); |
452edd59 | 1562 | if (IS_ERR(dst)) |
1da177e4 | 1563 | return; |
1da177e4 LT |
1564 | |
1565 | rt = (struct rt6_info *) dst; | |
1566 | ||
1567 | if (rt->rt6i_flags & RTF_GATEWAY) { | |
675418d5 JP |
1568 | ND_PRINTK(2, warn, |
1569 | "Redirect: destination is not a neighbour\n"); | |
d73f0801 | 1570 | goto release; |
1da177e4 | 1571 | } |
fd0273d7 | 1572 | peer = inet_getpeer_v6(net->ipv6.peers, &ipv6_hdr(skb)->saddr, 1); |
1d861aa4 DM |
1573 | ret = inet_peer_xrlim_allow(peer, 1*HZ); |
1574 | if (peer) | |
1575 | inet_putpeer(peer); | |
1576 | if (!ret) | |
d73f0801 | 1577 | goto release; |
1da177e4 LT |
1578 | |
1579 | if (dev->addr_len) { | |
4991969a DM |
1580 | struct neighbour *neigh = dst_neigh_lookup(skb_dst(skb), target); |
1581 | if (!neigh) { | |
675418d5 JP |
1582 | ND_PRINTK(2, warn, |
1583 | "Redirect: no neigh for target address\n"); | |
4991969a DM |
1584 | goto release; |
1585 | } | |
1586 | ||
1da177e4 LT |
1587 | read_lock_bh(&neigh->lock); |
1588 | if (neigh->nud_state & NUD_VALID) { | |
1589 | memcpy(ha_buf, neigh->ha, dev->addr_len); | |
1590 | read_unlock_bh(&neigh->lock); | |
1591 | ha = ha_buf; | |
f997c55c AA |
1592 | optlen += ndisc_redirect_opt_addr_space(dev, neigh, |
1593 | ops_data_buf, | |
1594 | &ops_data); | |
1da177e4 LT |
1595 | } else |
1596 | read_unlock_bh(&neigh->lock); | |
4991969a DM |
1597 | |
1598 | neigh_release(neigh); | |
1da177e4 LT |
1599 | } |
1600 | ||
1601 | rd_len = min_t(unsigned int, | |
2ce13576 YH |
1602 | IPV6_MIN_MTU - sizeof(struct ipv6hdr) - sizeof(*msg) - optlen, |
1603 | skb->len + 8); | |
1da177e4 | 1604 | rd_len &= ~0x7; |
2ce13576 | 1605 | optlen += rd_len; |
1da177e4 | 1606 | |
2ce13576 | 1607 | buff = ndisc_alloc_skb(dev, sizeof(*msg) + optlen); |
de09334b | 1608 | if (!buff) |
d73f0801 | 1609 | goto release; |
1da177e4 | 1610 | |
4d5c152e YH |
1611 | msg = (struct rd_msg *)skb_put(buff, sizeof(*msg)); |
1612 | *msg = (struct rd_msg) { | |
1613 | .icmph = { | |
1614 | .icmp6_type = NDISC_REDIRECT, | |
1615 | }, | |
1616 | .target = *target, | |
1617 | .dest = ipv6_hdr(skb)->daddr, | |
1618 | }; | |
1da177e4 | 1619 | |
1da177e4 LT |
1620 | /* |
1621 | * include target_address option | |
1622 | */ | |
1623 | ||
1624 | if (ha) | |
f997c55c | 1625 | ndisc_fill_redirect_addr_option(buff, ha, ops_data); |
1da177e4 LT |
1626 | |
1627 | /* | |
1628 | * build redirect option and copy skb over to the new packet. | |
1629 | */ | |
1630 | ||
9c86dafe | 1631 | if (rd_len) |
5f5a0115 | 1632 | ndisc_fill_redirect_hdr_option(buff, skb, rd_len); |
1da177e4 | 1633 | |
adf30907 | 1634 | skb_dst_set(buff, dst); |
f4de84c6 | 1635 | ndisc_send_skb(buff, &ipv6_hdr(skb)->saddr, &saddr_buf); |
d73f0801 IJ |
1636 | return; |
1637 | ||
1638 | release: | |
1639 | dst_release(dst); | |
1da177e4 LT |
1640 | } |
1641 | ||
1642 | static void pndisc_redo(struct sk_buff *skb) | |
1643 | { | |
140e26fc | 1644 | ndisc_recv_ns(skb); |
1da177e4 LT |
1645 | kfree_skb(skb); |
1646 | } | |
1647 | ||
b800c3b9 HFS |
1648 | static bool ndisc_suppress_frag_ndisc(struct sk_buff *skb) |
1649 | { | |
1650 | struct inet6_dev *idev = __in6_dev_get(skb->dev); | |
1651 | ||
1652 | if (!idev) | |
1653 | return true; | |
1654 | if (IP6CB(skb)->flags & IP6SKB_FRAGMENTED && | |
1655 | idev->cnf.suppress_frag_ndisc) { | |
1656 | net_warn_ratelimited("Received fragmented ndisc packet. Carefully consider disabling suppress_frag_ndisc.\n"); | |
1657 | return true; | |
1658 | } | |
1659 | return false; | |
1660 | } | |
1661 | ||
1da177e4 LT |
1662 | int ndisc_rcv(struct sk_buff *skb) |
1663 | { | |
1664 | struct nd_msg *msg; | |
1665 | ||
b800c3b9 HFS |
1666 | if (ndisc_suppress_frag_ndisc(skb)) |
1667 | return 0; | |
1668 | ||
6bce6b4e | 1669 | if (skb_linearize(skb)) |
1da177e4 LT |
1670 | return 0; |
1671 | ||
9c70220b | 1672 | msg = (struct nd_msg *)skb_transport_header(skb); |
1da177e4 | 1673 | |
9c70220b | 1674 | __skb_push(skb, skb->data - skb_transport_header(skb)); |
1da177e4 | 1675 | |
0660e03f | 1676 | if (ipv6_hdr(skb)->hop_limit != 255) { |
675418d5 JP |
1677 | ND_PRINTK(2, warn, "NDISC: invalid hop-limit: %d\n", |
1678 | ipv6_hdr(skb)->hop_limit); | |
1da177e4 LT |
1679 | return 0; |
1680 | } | |
1681 | ||
1682 | if (msg->icmph.icmp6_code != 0) { | |
675418d5 JP |
1683 | ND_PRINTK(2, warn, "NDISC: invalid ICMPv6 code: %d\n", |
1684 | msg->icmph.icmp6_code); | |
1da177e4 LT |
1685 | return 0; |
1686 | } | |
1687 | ||
a61bbcf2 PM |
1688 | memset(NEIGH_CB(skb), 0, sizeof(struct neighbour_cb)); |
1689 | ||
1da177e4 LT |
1690 | switch (msg->icmph.icmp6_type) { |
1691 | case NDISC_NEIGHBOUR_SOLICITATION: | |
1692 | ndisc_recv_ns(skb); | |
1693 | break; | |
1694 | ||
1695 | case NDISC_NEIGHBOUR_ADVERTISEMENT: | |
1696 | ndisc_recv_na(skb); | |
1697 | break; | |
1698 | ||
1699 | case NDISC_ROUTER_SOLICITATION: | |
1700 | ndisc_recv_rs(skb); | |
1701 | break; | |
1702 | ||
1703 | case NDISC_ROUTER_ADVERTISEMENT: | |
1704 | ndisc_router_discovery(skb); | |
1705 | break; | |
1706 | ||
1707 | case NDISC_REDIRECT: | |
1708 | ndisc_redirect_rcv(skb); | |
1709 | break; | |
3ff50b79 | 1710 | } |
1da177e4 LT |
1711 | |
1712 | return 0; | |
1713 | } | |
1714 | ||
1715 | static int ndisc_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1716 | { | |
351638e7 | 1717 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
c8507fb2 | 1718 | struct netdev_notifier_change_info *change_info; |
c346dca1 | 1719 | struct net *net = dev_net(dev); |
5cb04436 | 1720 | struct inet6_dev *idev; |
1da177e4 LT |
1721 | |
1722 | switch (event) { | |
1723 | case NETDEV_CHANGEADDR: | |
1724 | neigh_changeaddr(&nd_tbl, dev); | |
2ac3ac8f | 1725 | fib6_run_gc(0, net, false); |
5cb04436 HFS |
1726 | idev = in6_dev_get(dev); |
1727 | if (!idev) | |
1728 | break; | |
1729 | if (idev->cnf.ndisc_notify) | |
1730 | ndisc_send_unsol_na(dev); | |
1731 | in6_dev_put(idev); | |
1da177e4 | 1732 | break; |
c8507fb2 ED |
1733 | case NETDEV_CHANGE: |
1734 | change_info = ptr; | |
1735 | if (change_info->flags_changed & IFF_NOARP) | |
1736 | neigh_changeaddr(&nd_tbl, dev); | |
1737 | break; | |
1da177e4 LT |
1738 | case NETDEV_DOWN: |
1739 | neigh_ifdown(&nd_tbl, dev); | |
2ac3ac8f | 1740 | fib6_run_gc(0, net, false); |
1da177e4 | 1741 | break; |
f47b9464 BH |
1742 | case NETDEV_NOTIFY_PEERS: |
1743 | ndisc_send_unsol_na(dev); | |
1744 | break; | |
1da177e4 LT |
1745 | default: |
1746 | break; | |
1747 | } | |
1748 | ||
1749 | return NOTIFY_DONE; | |
1750 | } | |
1751 | ||
1752 | static struct notifier_block ndisc_netdev_notifier = { | |
1753 | .notifier_call = ndisc_netdev_event, | |
1754 | }; | |
1755 | ||
1756 | #ifdef CONFIG_SYSCTL | |
1757 | static void ndisc_warn_deprecated_sysctl(struct ctl_table *ctl, | |
1758 | const char *func, const char *dev_name) | |
1759 | { | |
1760 | static char warncomm[TASK_COMM_LEN]; | |
1761 | static int warned; | |
1762 | if (strcmp(warncomm, current->comm) && warned < 5) { | |
1763 | strcpy(warncomm, current->comm); | |
f3213831 | 1764 | 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 |
1765 | warncomm, func, |
1766 | dev_name, ctl->procname, | |
1767 | dev_name, ctl->procname); | |
1768 | warned++; | |
1769 | } | |
1770 | } | |
1771 | ||
8d65af78 | 1772 | int ndisc_ifinfo_sysctl_change(struct ctl_table *ctl, int write, void __user *buffer, size_t *lenp, loff_t *ppos) |
1da177e4 LT |
1773 | { |
1774 | struct net_device *dev = ctl->extra1; | |
1775 | struct inet6_dev *idev; | |
1776 | int ret; | |
1777 | ||
d12af679 EB |
1778 | if ((strcmp(ctl->procname, "retrans_time") == 0) || |
1779 | (strcmp(ctl->procname, "base_reachable_time") == 0)) | |
1da177e4 LT |
1780 | ndisc_warn_deprecated_sysctl(ctl, "syscall", dev ? dev->name : "default"); |
1781 | ||
d12af679 | 1782 | if (strcmp(ctl->procname, "retrans_time") == 0) |
cb5b09c1 | 1783 | ret = neigh_proc_dointvec(ctl, write, buffer, lenp, ppos); |
d12af679 EB |
1784 | |
1785 | else if (strcmp(ctl->procname, "base_reachable_time") == 0) | |
cb5b09c1 JP |
1786 | ret = neigh_proc_dointvec_jiffies(ctl, write, |
1787 | buffer, lenp, ppos); | |
d12af679 EB |
1788 | |
1789 | else if ((strcmp(ctl->procname, "retrans_time_ms") == 0) || | |
ad02ac14 | 1790 | (strcmp(ctl->procname, "base_reachable_time_ms") == 0)) |
cb5b09c1 JP |
1791 | ret = neigh_proc_dointvec_ms_jiffies(ctl, write, |
1792 | buffer, lenp, ppos); | |
d12af679 | 1793 | else |
1da177e4 | 1794 | ret = -1; |
1da177e4 LT |
1795 | |
1796 | if (write && ret == 0 && dev && (idev = in6_dev_get(dev)) != NULL) { | |
1f9248e5 JP |
1797 | if (ctl->data == &NEIGH_VAR(idev->nd_parms, BASE_REACHABLE_TIME)) |
1798 | idev->nd_parms->reachable_time = | |
1799 | neigh_rand_reach_time(NEIGH_VAR(idev->nd_parms, BASE_REACHABLE_TIME)); | |
1da177e4 LT |
1800 | idev->tstamp = jiffies; |
1801 | inet6_ifinfo_notify(RTM_NEWLINK, idev); | |
1802 | in6_dev_put(idev); | |
1803 | } | |
1804 | return ret; | |
1805 | } | |
1806 | ||
1da177e4 LT |
1807 | |
1808 | #endif | |
1809 | ||
2c8c1e72 | 1810 | static int __net_init ndisc_net_init(struct net *net) |
1da177e4 LT |
1811 | { |
1812 | struct ipv6_pinfo *np; | |
1813 | struct sock *sk; | |
1ab1457c | 1814 | int err; |
1da177e4 | 1815 | |
1ed8516f DL |
1816 | err = inet_ctl_sock_create(&sk, PF_INET6, |
1817 | SOCK_RAW, IPPROTO_ICMPV6, net); | |
1da177e4 | 1818 | if (err < 0) { |
675418d5 JP |
1819 | ND_PRINTK(0, err, |
1820 | "NDISC: Failed to initialize the control socket (err %d)\n", | |
1821 | err); | |
1da177e4 LT |
1822 | return err; |
1823 | } | |
1824 | ||
1ed8516f | 1825 | net->ipv6.ndisc_sk = sk; |
1762f7e8 | 1826 | |
1da177e4 | 1827 | np = inet6_sk(sk); |
1da177e4 LT |
1828 | np->hop_limit = 255; |
1829 | /* Do not loopback ndisc messages */ | |
1830 | np->mc_loop = 0; | |
1da177e4 | 1831 | |
1762f7e8 DL |
1832 | return 0; |
1833 | } | |
1834 | ||
2c8c1e72 | 1835 | static void __net_exit ndisc_net_exit(struct net *net) |
1762f7e8 | 1836 | { |
1ed8516f | 1837 | inet_ctl_sock_destroy(net->ipv6.ndisc_sk); |
1762f7e8 DL |
1838 | } |
1839 | ||
1840 | static struct pernet_operations ndisc_net_ops = { | |
1841 | .init = ndisc_net_init, | |
1842 | .exit = ndisc_net_exit, | |
1843 | }; | |
1844 | ||
1845 | int __init ndisc_init(void) | |
1846 | { | |
1847 | int err; | |
1848 | ||
1849 | err = register_pernet_subsys(&ndisc_net_ops); | |
1850 | if (err) | |
1851 | return err; | |
1ab1457c YH |
1852 | /* |
1853 | * Initialize the neighbour table | |
1854 | */ | |
d7480fd3 | 1855 | neigh_table_init(NEIGH_ND_TABLE, &nd_tbl); |
1da177e4 LT |
1856 | |
1857 | #ifdef CONFIG_SYSCTL | |
73af614a | 1858 | err = neigh_sysctl_register(NULL, &nd_tbl.parms, |
56ec0fb1 | 1859 | ndisc_ifinfo_sysctl_change); |
1762f7e8 DL |
1860 | if (err) |
1861 | goto out_unregister_pernet; | |
1762f7e8 | 1862 | out: |
bcd081a3 | 1863 | #endif |
1762f7e8 | 1864 | return err; |
1da177e4 | 1865 | |
1762f7e8 | 1866 | #ifdef CONFIG_SYSCTL |
1762f7e8 | 1867 | out_unregister_pernet: |
1762f7e8 DL |
1868 | unregister_pernet_subsys(&ndisc_net_ops); |
1869 | goto out; | |
2c861cc6 | 1870 | #endif |
1da177e4 LT |
1871 | } |
1872 | ||
2c861cc6 MK |
1873 | int __init ndisc_late_init(void) |
1874 | { | |
1875 | return register_netdevice_notifier(&ndisc_netdev_notifier); | |
1876 | } | |
1877 | ||
1878 | void ndisc_late_cleanup(void) | |
1da177e4 | 1879 | { |
36f73d0c | 1880 | unregister_netdevice_notifier(&ndisc_netdev_notifier); |
2c861cc6 MK |
1881 | } |
1882 | ||
1883 | void ndisc_cleanup(void) | |
1884 | { | |
1da177e4 LT |
1885 | #ifdef CONFIG_SYSCTL |
1886 | neigh_sysctl_unregister(&nd_tbl.parms); | |
1887 | #endif | |
d7480fd3 | 1888 | neigh_table_clear(NEIGH_ND_TABLE, &nd_tbl); |
1762f7e8 | 1889 | unregister_pernet_subsys(&ndisc_net_ops); |
1da177e4 | 1890 | } |