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Commit | Line | Data |
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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> |
ca254490 | 70 | #include <net/l3mdev.h> |
1da177e4 LT |
71 | #include <linux/proc_fs.h> |
72 | ||
73 | #include <linux/netfilter.h> | |
74 | #include <linux/netfilter_ipv6.h> | |
75 | ||
d6bf7817 ED |
76 | static u32 ndisc_hash(const void *pkey, |
77 | const struct net_device *dev, | |
2c2aba6c | 78 | __u32 *hash_rnd); |
60395a20 | 79 | static bool ndisc_key_eq(const struct neighbour *neigh, const void *pkey); |
1da177e4 LT |
80 | static int ndisc_constructor(struct neighbour *neigh); |
81 | static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb); | |
82 | static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb); | |
83 | static int pndisc_constructor(struct pneigh_entry *n); | |
84 | static void pndisc_destructor(struct pneigh_entry *n); | |
85 | static void pndisc_redo(struct sk_buff *skb); | |
86 | ||
89d69d2b | 87 | static const struct neigh_ops ndisc_generic_ops = { |
1da177e4 LT |
88 | .family = AF_INET6, |
89 | .solicit = ndisc_solicit, | |
90 | .error_report = ndisc_error_report, | |
91 | .output = neigh_resolve_output, | |
92 | .connected_output = neigh_connected_output, | |
1da177e4 LT |
93 | }; |
94 | ||
89d69d2b | 95 | static const struct neigh_ops ndisc_hh_ops = { |
1da177e4 LT |
96 | .family = AF_INET6, |
97 | .solicit = ndisc_solicit, | |
98 | .error_report = ndisc_error_report, | |
99 | .output = neigh_resolve_output, | |
100 | .connected_output = neigh_resolve_output, | |
1da177e4 LT |
101 | }; |
102 | ||
103 | ||
89d69d2b | 104 | static const struct neigh_ops ndisc_direct_ops = { |
1da177e4 | 105 | .family = AF_INET6, |
8f40b161 DM |
106 | .output = neigh_direct_output, |
107 | .connected_output = neigh_direct_output, | |
1da177e4 LT |
108 | }; |
109 | ||
110 | struct neigh_table nd_tbl = { | |
111 | .family = AF_INET6, | |
1da177e4 | 112 | .key_len = sizeof(struct in6_addr), |
bdf53c58 | 113 | .protocol = cpu_to_be16(ETH_P_IPV6), |
1da177e4 | 114 | .hash = ndisc_hash, |
60395a20 | 115 | .key_eq = ndisc_key_eq, |
1da177e4 LT |
116 | .constructor = ndisc_constructor, |
117 | .pconstructor = pndisc_constructor, | |
118 | .pdestructor = pndisc_destructor, | |
119 | .proxy_redo = pndisc_redo, | |
120 | .id = "ndisc_cache", | |
121 | .parms = { | |
b672083e | 122 | .tbl = &nd_tbl, |
b672083e | 123 | .reachable_time = ND_REACHABLE_TIME, |
1f9248e5 JP |
124 | .data = { |
125 | [NEIGH_VAR_MCAST_PROBES] = 3, | |
126 | [NEIGH_VAR_UCAST_PROBES] = 3, | |
127 | [NEIGH_VAR_RETRANS_TIME] = ND_RETRANS_TIMER, | |
128 | [NEIGH_VAR_BASE_REACHABLE_TIME] = ND_REACHABLE_TIME, | |
129 | [NEIGH_VAR_DELAY_PROBE_TIME] = 5 * HZ, | |
130 | [NEIGH_VAR_GC_STALETIME] = 60 * HZ, | |
131 | [NEIGH_VAR_QUEUE_LEN_BYTES] = 64 * 1024, | |
132 | [NEIGH_VAR_PROXY_QLEN] = 64, | |
133 | [NEIGH_VAR_ANYCAST_DELAY] = 1 * HZ, | |
134 | [NEIGH_VAR_PROXY_DELAY] = (8 * HZ) / 10, | |
135 | }, | |
1da177e4 LT |
136 | }, |
137 | .gc_interval = 30 * HZ, | |
138 | .gc_thresh1 = 128, | |
139 | .gc_thresh2 = 512, | |
140 | .gc_thresh3 = 1024, | |
141 | }; | |
c4850687 | 142 | EXPORT_SYMBOL_GPL(nd_tbl); |
1da177e4 | 143 | |
cc84b3c6 AA |
144 | void __ndisc_fill_addr_option(struct sk_buff *skb, int type, void *data, |
145 | int data_len, int pad) | |
1da177e4 | 146 | { |
8ec5da41 | 147 | int space = __ndisc_opt_addr_space(data_len, pad); |
5f5a0115 | 148 | u8 *opt = skb_put(skb, space); |
1da177e4 LT |
149 | |
150 | opt[0] = type; | |
151 | opt[1] = space>>3; | |
152 | ||
153 | memset(opt + 2, 0, pad); | |
154 | opt += pad; | |
155 | space -= pad; | |
156 | ||
157 | memcpy(opt+2, data, data_len); | |
158 | data_len += 2; | |
159 | opt += data_len; | |
e5d08d71 IM |
160 | space -= data_len; |
161 | if (space > 0) | |
1da177e4 | 162 | memset(opt, 0, space); |
1da177e4 | 163 | } |
cc84b3c6 | 164 | EXPORT_SYMBOL_GPL(__ndisc_fill_addr_option); |
1da177e4 | 165 | |
8ec5da41 | 166 | static inline void ndisc_fill_addr_option(struct sk_buff *skb, int type, |
f997c55c | 167 | void *data, u8 icmp6_type) |
8ec5da41 AA |
168 | { |
169 | __ndisc_fill_addr_option(skb, type, data, skb->dev->addr_len, | |
170 | ndisc_addr_option_pad(skb->dev->type)); | |
f997c55c AA |
171 | ndisc_ops_fill_addr_option(skb->dev, skb, icmp6_type); |
172 | } | |
173 | ||
174 | static inline void ndisc_fill_redirect_addr_option(struct sk_buff *skb, | |
175 | void *ha, | |
176 | const u8 *ops_data) | |
177 | { | |
178 | ndisc_fill_addr_option(skb, ND_OPT_TARGET_LL_ADDR, ha, NDISC_REDIRECT); | |
179 | ndisc_ops_fill_redirect_addr_option(skb->dev, skb, ops_data); | |
8ec5da41 AA |
180 | } |
181 | ||
1da177e4 LT |
182 | static struct nd_opt_hdr *ndisc_next_option(struct nd_opt_hdr *cur, |
183 | struct nd_opt_hdr *end) | |
184 | { | |
185 | int type; | |
186 | if (!cur || !end || cur >= end) | |
187 | return NULL; | |
188 | type = cur->nd_opt_type; | |
189 | do { | |
190 | cur = ((void *)cur) + (cur->nd_opt_len << 3); | |
67ba4152 | 191 | } while (cur < end && cur->nd_opt_type != type); |
a02cec21 | 192 | return cur <= end && cur->nd_opt_type == type ? cur : NULL; |
1da177e4 LT |
193 | } |
194 | ||
f997c55c AA |
195 | static inline int ndisc_is_useropt(const struct net_device *dev, |
196 | struct nd_opt_hdr *opt) | |
31910575 | 197 | { |
e35f30c1 | 198 | return opt->nd_opt_type == ND_OPT_RDNSS || |
f997c55c AA |
199 | opt->nd_opt_type == ND_OPT_DNSSL || |
200 | ndisc_ops_is_useropt(dev, opt->nd_opt_type); | |
31910575 PY |
201 | } |
202 | ||
f997c55c AA |
203 | static struct nd_opt_hdr *ndisc_next_useropt(const struct net_device *dev, |
204 | struct nd_opt_hdr *cur, | |
31910575 PY |
205 | struct nd_opt_hdr *end) |
206 | { | |
207 | if (!cur || !end || cur >= end) | |
208 | return NULL; | |
209 | do { | |
210 | cur = ((void *)cur) + (cur->nd_opt_len << 3); | |
f997c55c AA |
211 | } while (cur < end && !ndisc_is_useropt(dev, cur)); |
212 | return cur <= end && ndisc_is_useropt(dev, cur) ? cur : NULL; | |
31910575 PY |
213 | } |
214 | ||
f997c55c AA |
215 | struct ndisc_options *ndisc_parse_options(const struct net_device *dev, |
216 | u8 *opt, int opt_len, | |
30f2a5f3 | 217 | struct ndisc_options *ndopts) |
1da177e4 LT |
218 | { |
219 | struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)opt; | |
220 | ||
221 | if (!nd_opt || opt_len < 0 || !ndopts) | |
222 | return NULL; | |
223 | memset(ndopts, 0, sizeof(*ndopts)); | |
224 | while (opt_len) { | |
225 | int l; | |
226 | if (opt_len < sizeof(struct nd_opt_hdr)) | |
227 | return NULL; | |
228 | l = nd_opt->nd_opt_len << 3; | |
229 | if (opt_len < l || l == 0) | |
230 | return NULL; | |
f997c55c AA |
231 | if (ndisc_ops_parse_options(dev, nd_opt, ndopts)) |
232 | goto next_opt; | |
1da177e4 LT |
233 | switch (nd_opt->nd_opt_type) { |
234 | case ND_OPT_SOURCE_LL_ADDR: | |
235 | case ND_OPT_TARGET_LL_ADDR: | |
236 | case ND_OPT_MTU: | |
237 | case ND_OPT_REDIRECT_HDR: | |
238 | if (ndopts->nd_opt_array[nd_opt->nd_opt_type]) { | |
675418d5 JP |
239 | ND_PRINTK(2, warn, |
240 | "%s: duplicated ND6 option found: type=%d\n", | |
241 | __func__, nd_opt->nd_opt_type); | |
1da177e4 LT |
242 | } else { |
243 | ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt; | |
244 | } | |
245 | break; | |
246 | case ND_OPT_PREFIX_INFO: | |
247 | ndopts->nd_opts_pi_end = nd_opt; | |
cfcabdcc | 248 | if (!ndopts->nd_opt_array[nd_opt->nd_opt_type]) |
1da177e4 LT |
249 | ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt; |
250 | break; | |
70ceb4f5 YH |
251 | #ifdef CONFIG_IPV6_ROUTE_INFO |
252 | case ND_OPT_ROUTE_INFO: | |
253 | ndopts->nd_opts_ri_end = nd_opt; | |
254 | if (!ndopts->nd_opts_ri) | |
255 | ndopts->nd_opts_ri = nd_opt; | |
256 | break; | |
257 | #endif | |
1da177e4 | 258 | default: |
f997c55c | 259 | if (ndisc_is_useropt(dev, nd_opt)) { |
31910575 PY |
260 | ndopts->nd_useropts_end = nd_opt; |
261 | if (!ndopts->nd_useropts) | |
262 | ndopts->nd_useropts = nd_opt; | |
263 | } else { | |
264 | /* | |
265 | * Unknown options must be silently ignored, | |
266 | * to accommodate future extension to the | |
267 | * protocol. | |
268 | */ | |
675418d5 JP |
269 | ND_PRINTK(2, notice, |
270 | "%s: ignored unsupported option; type=%d, len=%d\n", | |
271 | __func__, | |
272 | nd_opt->nd_opt_type, | |
273 | nd_opt->nd_opt_len); | |
31910575 | 274 | } |
1da177e4 | 275 | } |
f997c55c | 276 | next_opt: |
1da177e4 LT |
277 | opt_len -= l; |
278 | nd_opt = ((void *)nd_opt) + l; | |
279 | } | |
280 | return ndopts; | |
281 | } | |
282 | ||
b71d1d42 | 283 | int ndisc_mc_map(const struct in6_addr *addr, char *buf, struct net_device *dev, int dir) |
1da177e4 LT |
284 | { |
285 | switch (dev->type) { | |
286 | case ARPHRD_ETHER: | |
287 | case ARPHRD_IEEE802: /* Not sure. Check it later. --ANK */ | |
288 | case ARPHRD_FDDI: | |
289 | ipv6_eth_mc_map(addr, buf); | |
290 | return 0; | |
1da177e4 LT |
291 | case ARPHRD_ARCNET: |
292 | ipv6_arcnet_mc_map(addr, buf); | |
293 | return 0; | |
294 | case ARPHRD_INFINIBAND: | |
a9e527e3 | 295 | ipv6_ib_mc_map(addr, dev->broadcast, buf); |
1da177e4 | 296 | return 0; |
93ca3bb5 TT |
297 | case ARPHRD_IPGRE: |
298 | return ipv6_ipgre_mc_map(addr, dev->broadcast, buf); | |
1da177e4 LT |
299 | default: |
300 | if (dir) { | |
301 | memcpy(buf, dev->broadcast, dev->addr_len); | |
302 | return 0; | |
303 | } | |
304 | } | |
305 | return -EINVAL; | |
306 | } | |
7159039a YH |
307 | EXPORT_SYMBOL(ndisc_mc_map); |
308 | ||
d6bf7817 ED |
309 | static u32 ndisc_hash(const void *pkey, |
310 | const struct net_device *dev, | |
2c2aba6c | 311 | __u32 *hash_rnd) |
1da177e4 | 312 | { |
2c2aba6c | 313 | return ndisc_hashfn(pkey, dev, hash_rnd); |
1da177e4 LT |
314 | } |
315 | ||
60395a20 EB |
316 | static bool ndisc_key_eq(const struct neighbour *n, const void *pkey) |
317 | { | |
318 | return neigh_key_eq128(n, pkey); | |
319 | } | |
320 | ||
1da177e4 LT |
321 | static int ndisc_constructor(struct neighbour *neigh) |
322 | { | |
67ba4152 | 323 | struct in6_addr *addr = (struct in6_addr *)&neigh->primary_key; |
1da177e4 LT |
324 | struct net_device *dev = neigh->dev; |
325 | struct inet6_dev *in6_dev; | |
326 | struct neigh_parms *parms; | |
a50feda5 | 327 | bool is_multicast = ipv6_addr_is_multicast(addr); |
1da177e4 | 328 | |
1da177e4 | 329 | in6_dev = in6_dev_get(dev); |
63159f29 | 330 | if (!in6_dev) { |
1da177e4 LT |
331 | return -EINVAL; |
332 | } | |
333 | ||
334 | parms = in6_dev->nd_parms; | |
335 | __neigh_parms_put(neigh->parms); | |
336 | neigh->parms = neigh_parms_clone(parms); | |
1da177e4 LT |
337 | |
338 | neigh->type = is_multicast ? RTN_MULTICAST : RTN_UNICAST; | |
3b04ddde | 339 | if (!dev->header_ops) { |
1da177e4 LT |
340 | neigh->nud_state = NUD_NOARP; |
341 | neigh->ops = &ndisc_direct_ops; | |
8f40b161 | 342 | neigh->output = neigh_direct_output; |
1da177e4 LT |
343 | } else { |
344 | if (is_multicast) { | |
345 | neigh->nud_state = NUD_NOARP; | |
346 | ndisc_mc_map(addr, neigh->ha, dev, 1); | |
347 | } else if (dev->flags&(IFF_NOARP|IFF_LOOPBACK)) { | |
348 | neigh->nud_state = NUD_NOARP; | |
349 | memcpy(neigh->ha, dev->dev_addr, dev->addr_len); | |
350 | if (dev->flags&IFF_LOOPBACK) | |
351 | neigh->type = RTN_LOCAL; | |
352 | } else if (dev->flags&IFF_POINTOPOINT) { | |
353 | neigh->nud_state = NUD_NOARP; | |
354 | memcpy(neigh->ha, dev->broadcast, dev->addr_len); | |
355 | } | |
3b04ddde | 356 | if (dev->header_ops->cache) |
1da177e4 LT |
357 | neigh->ops = &ndisc_hh_ops; |
358 | else | |
359 | neigh->ops = &ndisc_generic_ops; | |
360 | if (neigh->nud_state&NUD_VALID) | |
361 | neigh->output = neigh->ops->connected_output; | |
362 | else | |
363 | neigh->output = neigh->ops->output; | |
364 | } | |
365 | in6_dev_put(in6_dev); | |
366 | return 0; | |
367 | } | |
368 | ||
369 | static int pndisc_constructor(struct pneigh_entry *n) | |
370 | { | |
67ba4152 | 371 | struct in6_addr *addr = (struct in6_addr *)&n->key; |
1da177e4 LT |
372 | struct in6_addr maddr; |
373 | struct net_device *dev = n->dev; | |
374 | ||
63159f29 | 375 | if (!dev || !__in6_dev_get(dev)) |
1da177e4 LT |
376 | return -EINVAL; |
377 | addrconf_addr_solict_mult(addr, &maddr); | |
378 | ipv6_dev_mc_inc(dev, &maddr); | |
379 | return 0; | |
380 | } | |
381 | ||
382 | static void pndisc_destructor(struct pneigh_entry *n) | |
383 | { | |
67ba4152 | 384 | struct in6_addr *addr = (struct in6_addr *)&n->key; |
1da177e4 LT |
385 | struct in6_addr maddr; |
386 | struct net_device *dev = n->dev; | |
387 | ||
63159f29 | 388 | if (!dev || !__in6_dev_get(dev)) |
1da177e4 LT |
389 | return; |
390 | addrconf_addr_solict_mult(addr, &maddr); | |
391 | ipv6_dev_mc_dec(dev, &maddr); | |
392 | } | |
393 | ||
de09334b YH |
394 | static struct sk_buff *ndisc_alloc_skb(struct net_device *dev, |
395 | int len) | |
396 | { | |
397 | int hlen = LL_RESERVED_SPACE(dev); | |
398 | int tlen = dev->needed_tailroom; | |
399 | struct sock *sk = dev_net(dev)->ipv6.ndisc_sk; | |
400 | struct sk_buff *skb; | |
de09334b | 401 | |
25a6e6b8 | 402 | skb = alloc_skb(hlen + sizeof(struct ipv6hdr) + len + tlen, GFP_ATOMIC); |
de09334b | 403 | if (!skb) { |
25a6e6b8 TG |
404 | ND_PRINTK(0, err, "ndisc: %s failed to allocate an skb\n", |
405 | __func__); | |
de09334b YH |
406 | return NULL; |
407 | } | |
408 | ||
f382d03a YH |
409 | skb->protocol = htons(ETH_P_IPV6); |
410 | skb->dev = dev; | |
411 | ||
527a150f | 412 | skb_reserve(skb, hlen + sizeof(struct ipv6hdr)); |
5135e633 | 413 | skb_reset_transport_header(skb); |
de09334b | 414 | |
25a6e6b8 TG |
415 | /* Manually assign socket ownership as we avoid calling |
416 | * sock_alloc_send_pskb() to bypass wmem buffer limits | |
417 | */ | |
418 | skb_set_owner_w(skb, sk); | |
419 | ||
de09334b YH |
420 | return skb; |
421 | } | |
422 | ||
f382d03a | 423 | static void ip6_nd_hdr(struct sk_buff *skb, |
2576f17d YH |
424 | const struct in6_addr *saddr, |
425 | const struct in6_addr *daddr, | |
c8d6c380 | 426 | int hop_limit, int len) |
2576f17d YH |
427 | { |
428 | struct ipv6hdr *hdr; | |
429 | ||
527a150f | 430 | skb_push(skb, sizeof(*hdr)); |
2576f17d | 431 | skb_reset_network_header(skb); |
2576f17d YH |
432 | hdr = ipv6_hdr(skb); |
433 | ||
434 | ip6_flow_hdr(hdr, 0, 0); | |
435 | ||
436 | hdr->payload_len = htons(len); | |
c8d6c380 YH |
437 | hdr->nexthdr = IPPROTO_ICMPV6; |
438 | hdr->hop_limit = hop_limit; | |
2576f17d YH |
439 | |
440 | hdr->saddr = *saddr; | |
441 | hdr->daddr = *daddr; | |
442 | } | |
443 | ||
af9a9976 | 444 | static void ndisc_send_skb(struct sk_buff *skb, |
fd0ea7db | 445 | const struct in6_addr *daddr, |
aa4bdd4b | 446 | const struct in6_addr *saddr) |
305d552a | 447 | { |
f4de84c6 | 448 | struct dst_entry *dst = skb_dst(skb); |
af9a9976 | 449 | struct net *net = dev_net(skb->dev); |
7b3d9b06 | 450 | struct sock *sk = net->ipv6.ndisc_sk; |
305d552a BH |
451 | struct inet6_dev *idev; |
452 | int err; | |
aa4bdd4b | 453 | struct icmp6hdr *icmp6h = icmp6_hdr(skb); |
305d552a BH |
454 | u8 type; |
455 | ||
456 | type = icmp6h->icmp6_type; | |
457 | ||
f4de84c6 | 458 | if (!dst) { |
f4de84c6 | 459 | struct flowi6 fl6; |
ca254490 | 460 | int oif = l3mdev_fib_oif(skb->dev); |
305d552a | 461 | |
ca254490 DA |
462 | icmpv6_flow_init(sk, &fl6, type, saddr, daddr, oif); |
463 | if (oif != skb->dev->ifindex) | |
464 | fl6.flowi6_flags |= FLOWI_FLAG_L3MDEV_SRC; | |
f4de84c6 YH |
465 | dst = icmp6_dst_alloc(skb->dev, &fl6); |
466 | if (IS_ERR(dst)) { | |
467 | kfree_skb(skb); | |
468 | return; | |
469 | } | |
470 | ||
471 | skb_dst_set(skb, dst); | |
472 | } | |
e1ec7842 | 473 | |
7b3d9b06 YH |
474 | icmp6h->icmp6_cksum = csum_ipv6_magic(saddr, daddr, skb->len, |
475 | IPPROTO_ICMPV6, | |
476 | csum_partial(icmp6h, | |
477 | skb->len, 0)); | |
478 | ||
479 | ip6_nd_hdr(skb, saddr, daddr, inet6_sk(sk)->hop_limit, skb->len); | |
480 | ||
cfdf7647 ED |
481 | rcu_read_lock(); |
482 | idev = __in6_dev_get(dst->dev); | |
edf391ff | 483 | IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len); |
e1ec7842 | 484 | |
29a26a56 EB |
485 | err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, |
486 | net, sk, skb, NULL, dst->dev, | |
13206b6b | 487 | dst_output); |
1da177e4 | 488 | if (!err) { |
5c5d244b | 489 | ICMP6MSGOUT_INC_STATS(net, idev, type); |
a862f6a6 | 490 | ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); |
1da177e4 LT |
491 | } |
492 | ||
cfdf7647 | 493 | rcu_read_unlock(); |
1ab1457c | 494 | } |
1da177e4 | 495 | |
38cf595b | 496 | void ndisc_send_na(struct net_device *dev, const struct in6_addr *daddr, |
f564f45c CW |
497 | const struct in6_addr *solicited_addr, |
498 | bool router, bool solicited, bool override, bool inc_opt) | |
e1ec7842 | 499 | { |
b44b5f4a | 500 | struct sk_buff *skb; |
e1ec7842 YH |
501 | struct in6_addr tmpaddr; |
502 | struct inet6_ifaddr *ifp; | |
9acd9f3a | 503 | const struct in6_addr *src_addr; |
1cb3fe51 YH |
504 | struct nd_msg *msg; |
505 | int optlen = 0; | |
e1ec7842 YH |
506 | |
507 | /* for anycast or proxy, solicited_addr != src_addr */ | |
c346dca1 | 508 | ifp = ipv6_get_ifaddr(dev_net(dev), solicited_addr, dev, 1); |
e1ec7842 YH |
509 | if (ifp) { |
510 | src_addr = solicited_addr; | |
511 | if (ifp->flags & IFA_F_OPTIMISTIC) | |
f2f79cca | 512 | override = false; |
9f888160 | 513 | inc_opt |= ifp->idev->cnf.force_tllao; |
e1ec7842 YH |
514 | in6_ifa_put(ifp); |
515 | } else { | |
191cd582 | 516 | if (ipv6_dev_get_saddr(dev_net(dev), dev, daddr, |
c346dca1 | 517 | inet6_sk(dev_net(dev)->ipv6.ndisc_sk)->srcprefs, |
7cbca67c | 518 | &tmpaddr)) |
e1ec7842 YH |
519 | return; |
520 | src_addr = &tmpaddr; | |
521 | } | |
522 | ||
1cb3fe51 YH |
523 | if (!dev->addr_len) |
524 | inc_opt = 0; | |
525 | if (inc_opt) | |
f997c55c AA |
526 | optlen += ndisc_opt_addr_space(dev, |
527 | NDISC_NEIGHBOUR_ADVERTISEMENT); | |
e1ec7842 | 528 | |
1cb3fe51 | 529 | skb = ndisc_alloc_skb(dev, sizeof(*msg) + optlen); |
b44b5f4a YH |
530 | if (!skb) |
531 | return; | |
532 | ||
1cb3fe51 YH |
533 | msg = (struct nd_msg *)skb_put(skb, sizeof(*msg)); |
534 | *msg = (struct nd_msg) { | |
535 | .icmph = { | |
536 | .icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT, | |
537 | .icmp6_router = router, | |
538 | .icmp6_solicited = solicited, | |
539 | .icmp6_override = override, | |
540 | }, | |
541 | .target = *solicited_addr, | |
542 | }; | |
543 | ||
544 | if (inc_opt) | |
545 | ndisc_fill_addr_option(skb, ND_OPT_TARGET_LL_ADDR, | |
f997c55c AA |
546 | dev->dev_addr, |
547 | NDISC_NEIGHBOUR_ADVERTISEMENT); | |
1cb3fe51 | 548 | |
b44b5f4a | 549 | ndisc_send_skb(skb, daddr, src_addr); |
e1ec7842 YH |
550 | } |
551 | ||
f47b9464 BH |
552 | static void ndisc_send_unsol_na(struct net_device *dev) |
553 | { | |
554 | struct inet6_dev *idev; | |
555 | struct inet6_ifaddr *ifa; | |
f47b9464 BH |
556 | |
557 | idev = in6_dev_get(dev); | |
558 | if (!idev) | |
559 | return; | |
560 | ||
561 | read_lock_bh(&idev->lock); | |
562 | list_for_each_entry(ifa, &idev->addr_list, if_list) { | |
38cf595b | 563 | ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifa->addr, |
f47b9464 BH |
564 | /*router=*/ !!idev->cnf.forwarding, |
565 | /*solicited=*/ false, /*override=*/ true, | |
566 | /*inc_opt=*/ true); | |
567 | } | |
568 | read_unlock_bh(&idev->lock); | |
569 | ||
570 | in6_dev_put(idev); | |
571 | } | |
572 | ||
38cf595b | 573 | void ndisc_send_ns(struct net_device *dev, const struct in6_addr *solicit, |
304d888b | 574 | const struct in6_addr *daddr, const struct in6_addr *saddr) |
1da177e4 | 575 | { |
b44b5f4a | 576 | struct sk_buff *skb; |
1da177e4 | 577 | struct in6_addr addr_buf; |
1cb3fe51 YH |
578 | int inc_opt = dev->addr_len; |
579 | int optlen = 0; | |
580 | struct nd_msg *msg; | |
1da177e4 | 581 | |
63159f29 | 582 | if (!saddr) { |
95c385b4 NH |
583 | if (ipv6_get_lladdr(dev, &addr_buf, |
584 | (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC))) | |
1da177e4 LT |
585 | return; |
586 | saddr = &addr_buf; | |
587 | } | |
588 | ||
1cb3fe51 | 589 | if (ipv6_addr_any(saddr)) |
f2f79cca | 590 | inc_opt = false; |
1cb3fe51 | 591 | if (inc_opt) |
f997c55c AA |
592 | optlen += ndisc_opt_addr_space(dev, |
593 | NDISC_NEIGHBOUR_SOLICITATION); | |
1cb3fe51 YH |
594 | |
595 | skb = ndisc_alloc_skb(dev, sizeof(*msg) + optlen); | |
b44b5f4a YH |
596 | if (!skb) |
597 | return; | |
598 | ||
1cb3fe51 YH |
599 | msg = (struct nd_msg *)skb_put(skb, sizeof(*msg)); |
600 | *msg = (struct nd_msg) { | |
601 | .icmph = { | |
602 | .icmp6_type = NDISC_NEIGHBOUR_SOLICITATION, | |
603 | }, | |
604 | .target = *solicit, | |
605 | }; | |
606 | ||
607 | if (inc_opt) | |
608 | ndisc_fill_addr_option(skb, ND_OPT_SOURCE_LL_ADDR, | |
f997c55c AA |
609 | dev->dev_addr, |
610 | NDISC_NEIGHBOUR_SOLICITATION); | |
1cb3fe51 | 611 | |
b44b5f4a | 612 | ndisc_send_skb(skb, daddr, saddr); |
1da177e4 LT |
613 | } |
614 | ||
9acd9f3a YH |
615 | void ndisc_send_rs(struct net_device *dev, const struct in6_addr *saddr, |
616 | const struct in6_addr *daddr) | |
1da177e4 | 617 | { |
b44b5f4a | 618 | struct sk_buff *skb; |
1cb3fe51 | 619 | struct rs_msg *msg; |
95c385b4 | 620 | int send_sllao = dev->addr_len; |
1cb3fe51 | 621 | int optlen = 0; |
95c385b4 NH |
622 | |
623 | #ifdef CONFIG_IPV6_OPTIMISTIC_DAD | |
624 | /* | |
625 | * According to section 2.2 of RFC 4429, we must not | |
626 | * send router solicitations with a sllao from | |
627 | * optimistic addresses, but we may send the solicitation | |
628 | * if we don't include the sllao. So here we check | |
629 | * if our address is optimistic, and if so, we | |
bea85195 | 630 | * suppress the inclusion of the sllao. |
95c385b4 NH |
631 | */ |
632 | if (send_sllao) { | |
c346dca1 | 633 | struct inet6_ifaddr *ifp = ipv6_get_ifaddr(dev_net(dev), saddr, |
1cab3da6 | 634 | dev, 1); |
95c385b4 NH |
635 | if (ifp) { |
636 | if (ifp->flags & IFA_F_OPTIMISTIC) { | |
ca043569 | 637 | send_sllao = 0; |
95c385b4 | 638 | } |
ca043569 | 639 | in6_ifa_put(ifp); |
95c385b4 NH |
640 | } else { |
641 | send_sllao = 0; | |
642 | } | |
643 | } | |
644 | #endif | |
1cb3fe51 | 645 | if (send_sllao) |
f997c55c | 646 | optlen += ndisc_opt_addr_space(dev, NDISC_ROUTER_SOLICITATION); |
1cb3fe51 YH |
647 | |
648 | skb = ndisc_alloc_skb(dev, sizeof(*msg) + optlen); | |
b44b5f4a YH |
649 | if (!skb) |
650 | return; | |
651 | ||
1cb3fe51 YH |
652 | msg = (struct rs_msg *)skb_put(skb, sizeof(*msg)); |
653 | *msg = (struct rs_msg) { | |
654 | .icmph = { | |
655 | .icmp6_type = NDISC_ROUTER_SOLICITATION, | |
656 | }, | |
657 | }; | |
658 | ||
659 | if (send_sllao) | |
660 | ndisc_fill_addr_option(skb, ND_OPT_SOURCE_LL_ADDR, | |
f997c55c AA |
661 | dev->dev_addr, |
662 | NDISC_ROUTER_SOLICITATION); | |
1cb3fe51 | 663 | |
b44b5f4a | 664 | ndisc_send_skb(skb, daddr, saddr); |
1da177e4 | 665 | } |
1ab1457c | 666 | |
1da177e4 LT |
667 | |
668 | static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb) | |
669 | { | |
670 | /* | |
671 | * "The sender MUST return an ICMP | |
672 | * destination unreachable" | |
673 | */ | |
674 | dst_link_failure(skb); | |
675 | kfree_skb(skb); | |
676 | } | |
677 | ||
678 | /* Called with locked neigh: either read or both */ | |
679 | ||
680 | static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb) | |
681 | { | |
682 | struct in6_addr *saddr = NULL; | |
683 | struct in6_addr mcaddr; | |
684 | struct net_device *dev = neigh->dev; | |
685 | struct in6_addr *target = (struct in6_addr *)&neigh->primary_key; | |
686 | int probes = atomic_read(&neigh->probes); | |
687 | ||
c58da4c6 EK |
688 | if (skb && ipv6_chk_addr_and_flags(dev_net(dev), &ipv6_hdr(skb)->saddr, |
689 | dev, 1, | |
690 | IFA_F_TENTATIVE|IFA_F_OPTIMISTIC)) | |
0660e03f | 691 | saddr = &ipv6_hdr(skb)->saddr; |
e5d08d71 IM |
692 | probes -= NEIGH_VAR(neigh->parms, UCAST_PROBES); |
693 | if (probes < 0) { | |
1da177e4 | 694 | if (!(neigh->nud_state & NUD_VALID)) { |
675418d5 JP |
695 | ND_PRINTK(1, dbg, |
696 | "%s: trying to ucast probe in NUD_INVALID: %pI6\n", | |
697 | __func__, target); | |
1da177e4 | 698 | } |
304d888b | 699 | ndisc_send_ns(dev, target, target, saddr); |
1f9248e5 | 700 | } else if ((probes -= NEIGH_VAR(neigh->parms, APP_PROBES)) < 0) { |
1da177e4 | 701 | neigh_app_ns(neigh); |
1da177e4 LT |
702 | } else { |
703 | addrconf_addr_solict_mult(target, &mcaddr); | |
304d888b | 704 | ndisc_send_ns(dev, target, &mcaddr, saddr); |
1da177e4 LT |
705 | } |
706 | } | |
707 | ||
0736ffc0 YH |
708 | static int pndisc_is_router(const void *pkey, |
709 | struct net_device *dev) | |
fa86d322 PE |
710 | { |
711 | struct pneigh_entry *n; | |
0736ffc0 | 712 | int ret = -1; |
fa86d322 PE |
713 | |
714 | read_lock_bh(&nd_tbl.lock); | |
0736ffc0 YH |
715 | n = __pneigh_lookup(&nd_tbl, dev_net(dev), pkey, dev); |
716 | if (n) | |
717 | ret = !!(n->flags & NTF_ROUTER); | |
fa86d322 PE |
718 | read_unlock_bh(&nd_tbl.lock); |
719 | ||
0736ffc0 | 720 | return ret; |
fa86d322 PE |
721 | } |
722 | ||
f997c55c AA |
723 | void ndisc_update(const struct net_device *dev, struct neighbour *neigh, |
724 | const u8 *lladdr, u8 new, u32 flags, u8 icmp6_type, | |
725 | struct ndisc_options *ndopts) | |
726 | { | |
727 | neigh_update(neigh, lladdr, new, flags); | |
728 | /* report ndisc ops about neighbour update */ | |
729 | ndisc_ops_update(dev, neigh, flags, icmp6_type, ndopts); | |
730 | } | |
731 | ||
1da177e4 LT |
732 | static void ndisc_recv_ns(struct sk_buff *skb) |
733 | { | |
9c70220b | 734 | struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb); |
b71d1d42 ED |
735 | const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; |
736 | const struct in6_addr *daddr = &ipv6_hdr(skb)->daddr; | |
1da177e4 | 737 | u8 *lladdr = NULL; |
29a3cad5 | 738 | u32 ndoptlen = skb_tail_pointer(skb) - (skb_transport_header(skb) + |
27a884dc | 739 | offsetof(struct nd_msg, opt)); |
1da177e4 LT |
740 | struct ndisc_options ndopts; |
741 | struct net_device *dev = skb->dev; | |
742 | struct inet6_ifaddr *ifp; | |
743 | struct inet6_dev *idev = NULL; | |
744 | struct neighbour *neigh; | |
745 | int dad = ipv6_addr_any(saddr); | |
a50feda5 | 746 | bool inc; |
0736ffc0 | 747 | int is_router = -1; |
1da177e4 | 748 | |
115b0aa6 YH |
749 | if (skb->len < sizeof(struct nd_msg)) { |
750 | ND_PRINTK(2, warn, "NS: packet too short\n"); | |
751 | return; | |
752 | } | |
753 | ||
1da177e4 | 754 | if (ipv6_addr_is_multicast(&msg->target)) { |
675418d5 | 755 | ND_PRINTK(2, warn, "NS: multicast target address\n"); |
1da177e4 LT |
756 | return; |
757 | } | |
758 | ||
759 | /* | |
760 | * RFC2461 7.1.1: | |
761 | * DAD has to be destined for solicited node multicast address. | |
762 | */ | |
ca97a644 | 763 | if (dad && !ipv6_addr_is_solict_mult(daddr)) { |
675418d5 | 764 | ND_PRINTK(2, warn, "NS: bad DAD packet (wrong destination)\n"); |
1da177e4 LT |
765 | return; |
766 | } | |
767 | ||
f997c55c | 768 | if (!ndisc_parse_options(dev, msg->opt, ndoptlen, &ndopts)) { |
675418d5 | 769 | ND_PRINTK(2, warn, "NS: invalid ND options\n"); |
1da177e4 LT |
770 | return; |
771 | } | |
772 | ||
773 | if (ndopts.nd_opts_src_lladdr) { | |
774 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, dev); | |
775 | if (!lladdr) { | |
675418d5 JP |
776 | ND_PRINTK(2, warn, |
777 | "NS: invalid link-layer address length\n"); | |
1da177e4 LT |
778 | return; |
779 | } | |
780 | ||
781 | /* RFC2461 7.1.1: | |
1ab1457c YH |
782 | * If the IP source address is the unspecified address, |
783 | * there MUST NOT be source link-layer address option | |
1da177e4 LT |
784 | * in the message. |
785 | */ | |
786 | if (dad) { | |
675418d5 JP |
787 | ND_PRINTK(2, warn, |
788 | "NS: bad DAD packet (link-layer address option)\n"); | |
1da177e4 LT |
789 | return; |
790 | } | |
791 | } | |
792 | ||
793 | inc = ipv6_addr_is_multicast(daddr); | |
794 | ||
c346dca1 | 795 | ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1); |
a18bc695 | 796 | if (ifp) { |
ca254490 | 797 | have_ifp: |
95c385b4 NH |
798 | if (ifp->flags & (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC)) { |
799 | if (dad) { | |
95c385b4 NH |
800 | /* |
801 | * We are colliding with another node | |
802 | * who is doing DAD | |
803 | * so fail our DAD process | |
804 | */ | |
805 | addrconf_dad_failure(ifp); | |
9e3be4b3 | 806 | return; |
95c385b4 NH |
807 | } else { |
808 | /* | |
809 | * This is not a dad solicitation. | |
810 | * If we are an optimistic node, | |
811 | * we should respond. | |
812 | * Otherwise, we should ignore it. | |
813 | */ | |
814 | if (!(ifp->flags & IFA_F_OPTIMISTIC)) | |
1da177e4 | 815 | goto out; |
1da177e4 | 816 | } |
1da177e4 LT |
817 | } |
818 | ||
819 | idev = ifp->idev; | |
820 | } else { | |
53b7997f YH |
821 | struct net *net = dev_net(dev); |
822 | ||
ca254490 DA |
823 | /* perhaps an address on the master device */ |
824 | if (netif_is_l3_slave(dev)) { | |
825 | struct net_device *mdev; | |
826 | ||
827 | mdev = netdev_master_upper_dev_get_rcu(dev); | |
828 | if (mdev) { | |
829 | ifp = ipv6_get_ifaddr(net, &msg->target, mdev, 1); | |
830 | if (ifp) | |
831 | goto have_ifp; | |
832 | } | |
833 | } | |
834 | ||
1da177e4 LT |
835 | idev = in6_dev_get(dev); |
836 | if (!idev) { | |
837 | /* XXX: count this drop? */ | |
838 | return; | |
839 | } | |
840 | ||
53b7997f | 841 | if (ipv6_chk_acast_addr(net, dev, &msg->target) || |
1ab1457c | 842 | (idev->cnf.forwarding && |
53b7997f | 843 | (net->ipv6.devconf_all->proxy_ndp || idev->cnf.proxy_ndp) && |
0736ffc0 | 844 | (is_router = pndisc_is_router(&msg->target, dev)) >= 0)) { |
a61bbcf2 | 845 | if (!(NEIGH_CB(skb)->flags & LOCALLY_ENQUEUED) && |
1da177e4 | 846 | skb->pkt_type != PACKET_HOST && |
f2f79cca | 847 | inc && |
1f9248e5 | 848 | NEIGH_VAR(idev->nd_parms, PROXY_DELAY) != 0) { |
1da177e4 LT |
849 | /* |
850 | * for anycast or proxy, | |
1ab1457c YH |
851 | * sender should delay its response |
852 | * by a random time between 0 and | |
1da177e4 LT |
853 | * MAX_ANYCAST_DELAY_TIME seconds. |
854 | * (RFC2461) -- yoshfuji | |
855 | */ | |
856 | struct sk_buff *n = skb_clone(skb, GFP_ATOMIC); | |
857 | if (n) | |
858 | pneigh_enqueue(&nd_tbl, idev->nd_parms, n); | |
859 | goto out; | |
860 | } | |
861 | } else | |
862 | goto out; | |
863 | } | |
864 | ||
0736ffc0 | 865 | if (is_router < 0) |
fb568637 | 866 | is_router = idev->cnf.forwarding; |
62dd9318 | 867 | |
1da177e4 | 868 | if (dad) { |
38cf595b | 869 | ndisc_send_na(dev, &in6addr_linklocal_allnodes, &msg->target, |
fb568637 | 870 | !!is_router, false, (ifp != NULL), true); |
1da177e4 LT |
871 | goto out; |
872 | } | |
873 | ||
874 | if (inc) | |
875 | NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_mcast); | |
876 | else | |
877 | NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_ucast); | |
878 | ||
1ab1457c | 879 | /* |
1da177e4 LT |
880 | * update / create cache entry |
881 | * for the source address | |
882 | */ | |
883 | neigh = __neigh_lookup(&nd_tbl, saddr, dev, | |
884 | !inc || lladdr || !dev->addr_len); | |
885 | if (neigh) | |
f997c55c | 886 | ndisc_update(dev, neigh, lladdr, NUD_STALE, |
1da177e4 | 887 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
f997c55c AA |
888 | NEIGH_UPDATE_F_OVERRIDE, |
889 | NDISC_NEIGHBOUR_SOLICITATION, &ndopts); | |
3b04ddde | 890 | if (neigh || !dev->header_ops) { |
38cf595b | 891 | ndisc_send_na(dev, saddr, &msg->target, !!is_router, |
fb568637 | 892 | true, (ifp != NULL && inc), inc); |
1da177e4 LT |
893 | if (neigh) |
894 | neigh_release(neigh); | |
895 | } | |
896 | ||
897 | out: | |
898 | if (ifp) | |
899 | in6_ifa_put(ifp); | |
900 | else | |
901 | in6_dev_put(idev); | |
1da177e4 LT |
902 | } |
903 | ||
904 | static void ndisc_recv_na(struct sk_buff *skb) | |
905 | { | |
9c70220b | 906 | struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb); |
be7a010d | 907 | struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; |
b71d1d42 | 908 | const struct in6_addr *daddr = &ipv6_hdr(skb)->daddr; |
1da177e4 | 909 | u8 *lladdr = NULL; |
29a3cad5 | 910 | u32 ndoptlen = skb_tail_pointer(skb) - (skb_transport_header(skb) + |
27a884dc | 911 | offsetof(struct nd_msg, opt)); |
1da177e4 LT |
912 | struct ndisc_options ndopts; |
913 | struct net_device *dev = skb->dev; | |
7a02bf89 | 914 | struct inet6_dev *idev = __in6_dev_get(dev); |
1da177e4 LT |
915 | struct inet6_ifaddr *ifp; |
916 | struct neighbour *neigh; | |
917 | ||
918 | if (skb->len < sizeof(struct nd_msg)) { | |
675418d5 | 919 | ND_PRINTK(2, warn, "NA: packet too short\n"); |
1da177e4 LT |
920 | return; |
921 | } | |
922 | ||
923 | if (ipv6_addr_is_multicast(&msg->target)) { | |
675418d5 | 924 | ND_PRINTK(2, warn, "NA: target address is multicast\n"); |
1da177e4 LT |
925 | return; |
926 | } | |
927 | ||
928 | if (ipv6_addr_is_multicast(daddr) && | |
929 | msg->icmph.icmp6_solicited) { | |
675418d5 | 930 | ND_PRINTK(2, warn, "NA: solicited NA is multicasted\n"); |
1da177e4 LT |
931 | return; |
932 | } | |
1ab1457c | 933 | |
7a02bf89 JB |
934 | /* For some 802.11 wireless deployments (and possibly other networks), |
935 | * there will be a NA proxy and unsolicitd packets are attacks | |
936 | * and thus should not be accepted. | |
937 | */ | |
938 | if (!msg->icmph.icmp6_solicited && idev && | |
939 | idev->cnf.drop_unsolicited_na) | |
940 | return; | |
941 | ||
f997c55c | 942 | if (!ndisc_parse_options(dev, msg->opt, ndoptlen, &ndopts)) { |
675418d5 | 943 | ND_PRINTK(2, warn, "NS: invalid ND option\n"); |
1da177e4 LT |
944 | return; |
945 | } | |
946 | if (ndopts.nd_opts_tgt_lladdr) { | |
947 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, dev); | |
948 | if (!lladdr) { | |
675418d5 JP |
949 | ND_PRINTK(2, warn, |
950 | "NA: invalid link-layer address length\n"); | |
1da177e4 LT |
951 | return; |
952 | } | |
953 | } | |
c346dca1 | 954 | ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1); |
a18bc695 | 955 | if (ifp) { |
bd015928 DW |
956 | if (skb->pkt_type != PACKET_LOOPBACK |
957 | && (ifp->flags & IFA_F_TENTATIVE)) { | |
958 | addrconf_dad_failure(ifp); | |
959 | return; | |
1da177e4 LT |
960 | } |
961 | /* What should we make now? The advertisement | |
962 | is invalid, but ndisc specs say nothing | |
963 | about it. It could be misconfiguration, or | |
964 | an smart proxy agent tries to help us :-) | |
24fc7b86 JS |
965 | |
966 | We should not print the error if NA has been | |
967 | received from loopback - it is just our own | |
968 | unsolicited advertisement. | |
1da177e4 | 969 | */ |
24fc7b86 | 970 | if (skb->pkt_type != PACKET_LOOPBACK) |
675418d5 JP |
971 | ND_PRINTK(1, warn, |
972 | "NA: someone advertises our address %pI6 on %s!\n", | |
973 | &ifp->addr, ifp->idev->dev->name); | |
1da177e4 LT |
974 | in6_ifa_put(ifp); |
975 | return; | |
976 | } | |
977 | neigh = neigh_lookup(&nd_tbl, &msg->target, dev); | |
978 | ||
979 | if (neigh) { | |
980 | u8 old_flags = neigh->flags; | |
53b7997f | 981 | struct net *net = dev_net(dev); |
1da177e4 LT |
982 | |
983 | if (neigh->nud_state & NUD_FAILED) | |
984 | goto out; | |
985 | ||
5f3e6e9e VN |
986 | /* |
987 | * Don't update the neighbor cache entry on a proxy NA from | |
988 | * ourselves because either the proxied node is off link or it | |
989 | * has already sent a NA to us. | |
990 | */ | |
991 | if (lladdr && !memcmp(lladdr, dev->dev_addr, dev->addr_len) && | |
53b7997f YH |
992 | net->ipv6.devconf_all->forwarding && net->ipv6.devconf_all->proxy_ndp && |
993 | pneigh_lookup(&nd_tbl, net, &msg->target, dev, 0)) { | |
b20b6d97 | 994 | /* XXX: idev->cnf.proxy_ndp */ |
5f3e6e9e | 995 | goto out; |
fbea49e1 | 996 | } |
5f3e6e9e | 997 | |
f997c55c | 998 | ndisc_update(dev, neigh, lladdr, |
1da177e4 LT |
999 | msg->icmph.icmp6_solicited ? NUD_REACHABLE : NUD_STALE, |
1000 | NEIGH_UPDATE_F_WEAK_OVERRIDE| | |
1001 | (msg->icmph.icmp6_override ? NEIGH_UPDATE_F_OVERRIDE : 0)| | |
1002 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
f997c55c AA |
1003 | (msg->icmph.icmp6_router ? NEIGH_UPDATE_F_ISROUTER : 0), |
1004 | NDISC_NEIGHBOUR_ADVERTISEMENT, &ndopts); | |
1da177e4 LT |
1005 | |
1006 | if ((old_flags & ~neigh->flags) & NTF_ROUTER) { | |
1007 | /* | |
1008 | * Change: router to host | |
1009 | */ | |
be7a010d | 1010 | rt6_clean_tohost(dev_net(dev), saddr); |
1da177e4 LT |
1011 | } |
1012 | ||
1013 | out: | |
1014 | neigh_release(neigh); | |
1015 | } | |
1016 | } | |
1017 | ||
1018 | static void ndisc_recv_rs(struct sk_buff *skb) | |
1019 | { | |
9c70220b | 1020 | struct rs_msg *rs_msg = (struct rs_msg *)skb_transport_header(skb); |
1da177e4 LT |
1021 | unsigned long ndoptlen = skb->len - sizeof(*rs_msg); |
1022 | struct neighbour *neigh; | |
1023 | struct inet6_dev *idev; | |
b71d1d42 | 1024 | const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; |
1da177e4 LT |
1025 | struct ndisc_options ndopts; |
1026 | u8 *lladdr = NULL; | |
1027 | ||
1028 | if (skb->len < sizeof(*rs_msg)) | |
1029 | return; | |
1030 | ||
cfdf7647 | 1031 | idev = __in6_dev_get(skb->dev); |
1da177e4 | 1032 | if (!idev) { |
675418d5 | 1033 | ND_PRINTK(1, err, "RS: can't find in6 device\n"); |
1da177e4 LT |
1034 | return; |
1035 | } | |
1036 | ||
1037 | /* Don't accept RS if we're not in router mode */ | |
1038 | if (!idev->cnf.forwarding) | |
1039 | goto out; | |
1040 | ||
1041 | /* | |
1042 | * Don't update NCE if src = ::; | |
1043 | * this implies that the source node has no ip address assigned yet. | |
1044 | */ | |
1045 | if (ipv6_addr_any(saddr)) | |
1046 | goto out; | |
1047 | ||
1048 | /* Parse ND options */ | |
f997c55c | 1049 | if (!ndisc_parse_options(skb->dev, rs_msg->opt, ndoptlen, &ndopts)) { |
675418d5 | 1050 | ND_PRINTK(2, notice, "NS: invalid ND option, ignored\n"); |
1da177e4 LT |
1051 | goto out; |
1052 | } | |
1053 | ||
1054 | if (ndopts.nd_opts_src_lladdr) { | |
1055 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, | |
1056 | skb->dev); | |
1057 | if (!lladdr) | |
1058 | goto out; | |
1059 | } | |
1060 | ||
1061 | neigh = __neigh_lookup(&nd_tbl, saddr, skb->dev, 1); | |
1062 | if (neigh) { | |
f997c55c | 1063 | ndisc_update(skb->dev, neigh, lladdr, NUD_STALE, |
1da177e4 LT |
1064 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
1065 | NEIGH_UPDATE_F_OVERRIDE| | |
f997c55c AA |
1066 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER, |
1067 | NDISC_ROUTER_SOLICITATION, &ndopts); | |
1da177e4 LT |
1068 | neigh_release(neigh); |
1069 | } | |
1070 | out: | |
cfdf7647 | 1071 | return; |
1da177e4 LT |
1072 | } |
1073 | ||
31910575 PY |
1074 | static void ndisc_ra_useropt(struct sk_buff *ra, struct nd_opt_hdr *opt) |
1075 | { | |
1076 | struct icmp6hdr *icmp6h = (struct icmp6hdr *)skb_transport_header(ra); | |
1077 | struct sk_buff *skb; | |
1078 | struct nlmsghdr *nlh; | |
1079 | struct nduseroptmsg *ndmsg; | |
c346dca1 | 1080 | struct net *net = dev_net(ra->dev); |
31910575 PY |
1081 | int err; |
1082 | int base_size = NLMSG_ALIGN(sizeof(struct nduseroptmsg) | |
1083 | + (opt->nd_opt_len << 3)); | |
1084 | size_t msg_size = base_size + nla_total_size(sizeof(struct in6_addr)); | |
1085 | ||
1086 | skb = nlmsg_new(msg_size, GFP_ATOMIC); | |
63159f29 | 1087 | if (!skb) { |
31910575 PY |
1088 | err = -ENOBUFS; |
1089 | goto errout; | |
1090 | } | |
1091 | ||
1092 | nlh = nlmsg_put(skb, 0, 0, RTM_NEWNDUSEROPT, base_size, 0); | |
63159f29 | 1093 | if (!nlh) { |
31910575 PY |
1094 | goto nla_put_failure; |
1095 | } | |
1096 | ||
1097 | ndmsg = nlmsg_data(nlh); | |
1098 | ndmsg->nduseropt_family = AF_INET6; | |
dbb2ed24 | 1099 | ndmsg->nduseropt_ifindex = ra->dev->ifindex; |
31910575 PY |
1100 | ndmsg->nduseropt_icmp_type = icmp6h->icmp6_type; |
1101 | ndmsg->nduseropt_icmp_code = icmp6h->icmp6_code; | |
1102 | ndmsg->nduseropt_opts_len = opt->nd_opt_len << 3; | |
1103 | ||
1104 | memcpy(ndmsg + 1, opt, opt->nd_opt_len << 3); | |
1105 | ||
930345ea | 1106 | if (nla_put_in6_addr(skb, NDUSEROPT_SRCADDR, &ipv6_hdr(ra)->saddr)) |
c78679e8 | 1107 | goto nla_put_failure; |
31910575 PY |
1108 | nlmsg_end(skb, nlh); |
1109 | ||
1ce85fe4 | 1110 | rtnl_notify(skb, net, 0, RTNLGRP_ND_USEROPT, NULL, GFP_ATOMIC); |
31910575 PY |
1111 | return; |
1112 | ||
1113 | nla_put_failure: | |
1114 | nlmsg_free(skb); | |
1115 | err = -EMSGSIZE; | |
1116 | errout: | |
a18bc695 | 1117 | rtnl_set_sk_err(net, RTNLGRP_ND_USEROPT, err); |
31910575 PY |
1118 | } |
1119 | ||
1da177e4 LT |
1120 | static void ndisc_router_discovery(struct sk_buff *skb) |
1121 | { | |
9c70220b | 1122 | struct ra_msg *ra_msg = (struct ra_msg *)skb_transport_header(skb); |
1da177e4 LT |
1123 | struct neighbour *neigh = NULL; |
1124 | struct inet6_dev *in6_dev; | |
65f5c7c1 | 1125 | struct rt6_info *rt = NULL; |
1da177e4 LT |
1126 | int lifetime; |
1127 | struct ndisc_options ndopts; | |
1128 | int optlen; | |
ebacaaa0 | 1129 | unsigned int pref = 0; |
a394eef5 | 1130 | __u32 old_if_flags; |
2053aeb6 | 1131 | bool send_ifinfo_notify = false; |
1da177e4 | 1132 | |
67ba4152 | 1133 | __u8 *opt = (__u8 *)(ra_msg + 1); |
1da177e4 | 1134 | |
29a3cad5 SH |
1135 | optlen = (skb_tail_pointer(skb) - skb_transport_header(skb)) - |
1136 | sizeof(struct ra_msg); | |
1da177e4 | 1137 | |
f2a762d8 BG |
1138 | ND_PRINTK(2, info, |
1139 | "RA: %s, dev: %s\n", | |
1140 | __func__, skb->dev->name); | |
0660e03f | 1141 | if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) { |
675418d5 | 1142 | ND_PRINTK(2, warn, "RA: source address is not link-local\n"); |
1da177e4 LT |
1143 | return; |
1144 | } | |
1145 | if (optlen < 0) { | |
675418d5 | 1146 | ND_PRINTK(2, warn, "RA: packet too short\n"); |
1da177e4 LT |
1147 | return; |
1148 | } | |
1149 | ||
de357cc0 | 1150 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 | 1151 | if (skb->ndisc_nodetype == NDISC_NODETYPE_HOST) { |
675418d5 | 1152 | ND_PRINTK(2, warn, "RA: from host or unauthorized router\n"); |
fadf6bf0 TF |
1153 | return; |
1154 | } | |
de357cc0 | 1155 | #endif |
fadf6bf0 | 1156 | |
1da177e4 LT |
1157 | /* |
1158 | * set the RA_RECV flag in the interface | |
1159 | */ | |
1160 | ||
cfdf7647 | 1161 | in6_dev = __in6_dev_get(skb->dev); |
63159f29 | 1162 | if (!in6_dev) { |
675418d5 JP |
1163 | ND_PRINTK(0, err, "RA: can't find inet6 device for %s\n", |
1164 | skb->dev->name); | |
1da177e4 LT |
1165 | return; |
1166 | } | |
1da177e4 | 1167 | |
f997c55c | 1168 | if (!ndisc_parse_options(skb->dev, opt, optlen, &ndopts)) { |
675418d5 | 1169 | ND_PRINTK(2, warn, "RA: invalid ND options\n"); |
1da177e4 LT |
1170 | return; |
1171 | } | |
1172 | ||
f2a762d8 BG |
1173 | if (!ipv6_accept_ra(in6_dev)) { |
1174 | ND_PRINTK(2, info, | |
1175 | "RA: %s, did not accept ra for dev: %s\n", | |
1176 | __func__, skb->dev->name); | |
31ce8c71 | 1177 | goto skip_linkparms; |
f2a762d8 | 1178 | } |
31ce8c71 | 1179 | |
de357cc0 | 1180 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 | 1181 | /* skip link-specific parameters from interior routers */ |
f2a762d8 BG |
1182 | if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT) { |
1183 | ND_PRINTK(2, info, | |
1184 | "RA: %s, nodetype is NODEFAULT, dev: %s\n", | |
1185 | __func__, skb->dev->name); | |
fadf6bf0 | 1186 | goto skip_linkparms; |
f2a762d8 | 1187 | } |
de357cc0 | 1188 | #endif |
fadf6bf0 | 1189 | |
1da177e4 LT |
1190 | if (in6_dev->if_flags & IF_RS_SENT) { |
1191 | /* | |
1192 | * flag that an RA was received after an RS was sent | |
1193 | * out on this interface. | |
1194 | */ | |
1195 | in6_dev->if_flags |= IF_RA_RCVD; | |
1196 | } | |
1197 | ||
1198 | /* | |
1199 | * Remember the managed/otherconf flags from most recently | |
1200 | * received RA message (RFC 2462) -- yoshfuji | |
1201 | */ | |
a394eef5 | 1202 | old_if_flags = in6_dev->if_flags; |
1da177e4 LT |
1203 | in6_dev->if_flags = (in6_dev->if_flags & ~(IF_RA_MANAGED | |
1204 | IF_RA_OTHERCONF)) | | |
1205 | (ra_msg->icmph.icmp6_addrconf_managed ? | |
1206 | IF_RA_MANAGED : 0) | | |
1207 | (ra_msg->icmph.icmp6_addrconf_other ? | |
1208 | IF_RA_OTHERCONF : 0); | |
1209 | ||
a394eef5 | 1210 | if (old_if_flags != in6_dev->if_flags) |
2053aeb6 | 1211 | send_ifinfo_notify = true; |
a394eef5 | 1212 | |
f2a762d8 BG |
1213 | if (!in6_dev->cnf.accept_ra_defrtr) { |
1214 | ND_PRINTK(2, info, | |
1215 | "RA: %s, defrtr is false for dev: %s\n", | |
1216 | __func__, skb->dev->name); | |
65f5c7c1 | 1217 | goto skip_defrtr; |
f2a762d8 | 1218 | } |
65f5c7c1 | 1219 | |
d9333196 BG |
1220 | /* Do not accept RA with source-addr found on local machine unless |
1221 | * accept_ra_from_local is set to true. | |
1222 | */ | |
b6428817 LR |
1223 | if (!in6_dev->cnf.accept_ra_from_local && |
1224 | ipv6_chk_addr(dev_net(in6_dev->dev), &ipv6_hdr(skb)->saddr, | |
c1a9a291 | 1225 | in6_dev->dev, 0)) { |
f2a762d8 | 1226 | ND_PRINTK(2, info, |
d9333196 BG |
1227 | "RA from local address detected on dev: %s: default router ignored\n", |
1228 | skb->dev->name); | |
9f56220f | 1229 | goto skip_defrtr; |
f2a762d8 | 1230 | } |
9f56220f | 1231 | |
1da177e4 LT |
1232 | lifetime = ntohs(ra_msg->icmph.icmp6_rt_lifetime); |
1233 | ||
ebacaaa0 YH |
1234 | #ifdef CONFIG_IPV6_ROUTER_PREF |
1235 | pref = ra_msg->icmph.icmp6_router_pref; | |
1236 | /* 10b is handled as if it were 00b (medium) */ | |
930d6ff2 | 1237 | if (pref == ICMPV6_ROUTER_PREF_INVALID || |
6d5b78cd | 1238 | !in6_dev->cnf.accept_ra_rtr_pref) |
ebacaaa0 YH |
1239 | pref = ICMPV6_ROUTER_PREF_MEDIUM; |
1240 | #endif | |
1241 | ||
0660e03f | 1242 | rt = rt6_get_dflt_router(&ipv6_hdr(skb)->saddr, skb->dev); |
1da177e4 | 1243 | |
eb857186 DM |
1244 | if (rt) { |
1245 | neigh = dst_neigh_lookup(&rt->dst, &ipv6_hdr(skb)->saddr); | |
1246 | if (!neigh) { | |
675418d5 JP |
1247 | ND_PRINTK(0, err, |
1248 | "RA: %s got default router without neighbour\n", | |
1249 | __func__); | |
94e187c0 | 1250 | ip6_rt_put(rt); |
eb857186 DM |
1251 | return; |
1252 | } | |
1253 | } | |
1da177e4 | 1254 | if (rt && lifetime == 0) { |
e0a1ad73 | 1255 | ip6_del_rt(rt); |
1da177e4 LT |
1256 | rt = NULL; |
1257 | } | |
1258 | ||
f2a762d8 BG |
1259 | ND_PRINTK(3, info, "RA: rt: %p lifetime: %d, for dev: %s\n", |
1260 | rt, lifetime, skb->dev->name); | |
63159f29 | 1261 | if (!rt && lifetime) { |
f2a762d8 | 1262 | ND_PRINTK(3, info, "RA: adding default router\n"); |
1da177e4 | 1263 | |
0660e03f | 1264 | rt = rt6_add_dflt_router(&ipv6_hdr(skb)->saddr, skb->dev, pref); |
63159f29 | 1265 | if (!rt) { |
675418d5 JP |
1266 | ND_PRINTK(0, err, |
1267 | "RA: %s failed to add default route\n", | |
1268 | __func__); | |
1da177e4 LT |
1269 | return; |
1270 | } | |
1271 | ||
eb857186 | 1272 | neigh = dst_neigh_lookup(&rt->dst, &ipv6_hdr(skb)->saddr); |
63159f29 | 1273 | if (!neigh) { |
675418d5 JP |
1274 | ND_PRINTK(0, err, |
1275 | "RA: %s got default router without neighbour\n", | |
1276 | __func__); | |
94e187c0 | 1277 | ip6_rt_put(rt); |
1da177e4 LT |
1278 | return; |
1279 | } | |
1280 | neigh->flags |= NTF_ROUTER; | |
ebacaaa0 | 1281 | } else if (rt) { |
22441cfa | 1282 | rt->rt6i_flags = (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); |
1da177e4 LT |
1283 | } |
1284 | ||
1285 | if (rt) | |
1716a961 | 1286 | rt6_set_expires(rt, jiffies + (HZ * lifetime)); |
8013d1d7 HL |
1287 | if (in6_dev->cnf.accept_ra_min_hop_limit < 256 && |
1288 | ra_msg->icmph.icmp6_hop_limit) { | |
1289 | if (in6_dev->cnf.accept_ra_min_hop_limit <= ra_msg->icmph.icmp6_hop_limit) { | |
6fd99094 | 1290 | in6_dev->cnf.hop_limit = ra_msg->icmph.icmp6_hop_limit; |
8013d1d7 HL |
1291 | if (rt) |
1292 | dst_metric_set(&rt->dst, RTAX_HOPLIMIT, | |
1293 | ra_msg->icmph.icmp6_hop_limit); | |
6fd99094 | 1294 | } else { |
8013d1d7 | 1295 | ND_PRINTK(2, warn, "RA: Got route advertisement with lower hop_limit than minimum\n"); |
6fd99094 | 1296 | } |
1da177e4 LT |
1297 | } |
1298 | ||
65f5c7c1 YH |
1299 | skip_defrtr: |
1300 | ||
1da177e4 LT |
1301 | /* |
1302 | * Update Reachable Time and Retrans Timer | |
1303 | */ | |
1304 | ||
1305 | if (in6_dev->nd_parms) { | |
1306 | unsigned long rtime = ntohl(ra_msg->retrans_timer); | |
1307 | ||
1308 | if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/HZ) { | |
1309 | rtime = (rtime*HZ)/1000; | |
1310 | if (rtime < HZ/10) | |
1311 | rtime = HZ/10; | |
1f9248e5 | 1312 | NEIGH_VAR_SET(in6_dev->nd_parms, RETRANS_TIME, rtime); |
1da177e4 | 1313 | in6_dev->tstamp = jiffies; |
2053aeb6 | 1314 | send_ifinfo_notify = true; |
1da177e4 LT |
1315 | } |
1316 | ||
1317 | rtime = ntohl(ra_msg->reachable_time); | |
1318 | if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/(3*HZ)) { | |
1319 | rtime = (rtime*HZ)/1000; | |
1320 | ||
1321 | if (rtime < HZ/10) | |
1322 | rtime = HZ/10; | |
1323 | ||
1f9248e5 JP |
1324 | if (rtime != NEIGH_VAR(in6_dev->nd_parms, BASE_REACHABLE_TIME)) { |
1325 | NEIGH_VAR_SET(in6_dev->nd_parms, | |
1326 | BASE_REACHABLE_TIME, rtime); | |
1327 | NEIGH_VAR_SET(in6_dev->nd_parms, | |
1328 | GC_STALETIME, 3 * rtime); | |
1da177e4 LT |
1329 | in6_dev->nd_parms->reachable_time = neigh_rand_reach_time(rtime); |
1330 | in6_dev->tstamp = jiffies; | |
2053aeb6 | 1331 | send_ifinfo_notify = true; |
1da177e4 LT |
1332 | } |
1333 | } | |
1334 | } | |
1335 | ||
2053aeb6 MT |
1336 | /* |
1337 | * Send a notify if RA changed managed/otherconf flags or timer settings | |
1338 | */ | |
1339 | if (send_ifinfo_notify) | |
1340 | inet6_ifinfo_notify(RTM_NEWLINK, in6_dev); | |
1341 | ||
fadf6bf0 TF |
1342 | skip_linkparms: |
1343 | ||
1da177e4 LT |
1344 | /* |
1345 | * Process options. | |
1346 | */ | |
1347 | ||
1348 | if (!neigh) | |
0660e03f | 1349 | neigh = __neigh_lookup(&nd_tbl, &ipv6_hdr(skb)->saddr, |
1da177e4 LT |
1350 | skb->dev, 1); |
1351 | if (neigh) { | |
1352 | u8 *lladdr = NULL; | |
1353 | if (ndopts.nd_opts_src_lladdr) { | |
1354 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, | |
1355 | skb->dev); | |
1356 | if (!lladdr) { | |
675418d5 JP |
1357 | ND_PRINTK(2, warn, |
1358 | "RA: invalid link-layer address length\n"); | |
1da177e4 LT |
1359 | goto out; |
1360 | } | |
1361 | } | |
f997c55c | 1362 | ndisc_update(skb->dev, neigh, lladdr, NUD_STALE, |
1da177e4 LT |
1363 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
1364 | NEIGH_UPDATE_F_OVERRIDE| | |
1365 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
f997c55c AA |
1366 | NEIGH_UPDATE_F_ISROUTER, |
1367 | NDISC_ROUTER_ADVERTISEMENT, &ndopts); | |
1da177e4 LT |
1368 | } |
1369 | ||
f2a762d8 BG |
1370 | if (!ipv6_accept_ra(in6_dev)) { |
1371 | ND_PRINTK(2, info, | |
1372 | "RA: %s, accept_ra is false for dev: %s\n", | |
1373 | __func__, skb->dev->name); | |
31ce8c71 | 1374 | goto out; |
f2a762d8 | 1375 | } |
31ce8c71 | 1376 | |
70ceb4f5 | 1377 | #ifdef CONFIG_IPV6_ROUTE_INFO |
b6428817 LR |
1378 | if (!in6_dev->cnf.accept_ra_from_local && |
1379 | ipv6_chk_addr(dev_net(in6_dev->dev), &ipv6_hdr(skb)->saddr, | |
c1a9a291 | 1380 | in6_dev->dev, 0)) { |
f2a762d8 | 1381 | ND_PRINTK(2, info, |
d9333196 BG |
1382 | "RA from local address detected on dev: %s: router info ignored.\n", |
1383 | skb->dev->name); | |
9f56220f | 1384 | goto skip_routeinfo; |
f2a762d8 | 1385 | } |
9f56220f | 1386 | |
09c884d4 | 1387 | if (in6_dev->cnf.accept_ra_rtr_pref && ndopts.nd_opts_ri) { |
70ceb4f5 YH |
1388 | struct nd_opt_hdr *p; |
1389 | for (p = ndopts.nd_opts_ri; | |
1390 | p; | |
1391 | p = ndisc_next_option(p, ndopts.nd_opts_ri_end)) { | |
6294e000 YH |
1392 | struct route_info *ri = (struct route_info *)p; |
1393 | #ifdef CONFIG_IPV6_NDISC_NODETYPE | |
1394 | if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT && | |
1395 | ri->prefix_len == 0) | |
1396 | continue; | |
1397 | #endif | |
30e56918 DJ |
1398 | if (ri->prefix_len == 0 && |
1399 | !in6_dev->cnf.accept_ra_defrtr) | |
1400 | continue; | |
6294e000 | 1401 | if (ri->prefix_len > in6_dev->cnf.accept_ra_rt_info_max_plen) |
09c884d4 | 1402 | continue; |
67ba4152 | 1403 | rt6_route_rcv(skb->dev, (u8 *)p, (p->nd_opt_len) << 3, |
0660e03f | 1404 | &ipv6_hdr(skb)->saddr); |
70ceb4f5 YH |
1405 | } |
1406 | } | |
9f56220f AH |
1407 | |
1408 | skip_routeinfo: | |
70ceb4f5 YH |
1409 | #endif |
1410 | ||
de357cc0 | 1411 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 | 1412 | /* skip link-specific ndopts from interior routers */ |
f2a762d8 BG |
1413 | if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT) { |
1414 | ND_PRINTK(2, info, | |
1415 | "RA: %s, nodetype is NODEFAULT (interior routes), dev: %s\n", | |
1416 | __func__, skb->dev->name); | |
fadf6bf0 | 1417 | goto out; |
f2a762d8 | 1418 | } |
de357cc0 | 1419 | #endif |
fadf6bf0 | 1420 | |
c4fd30eb | 1421 | if (in6_dev->cnf.accept_ra_pinfo && ndopts.nd_opts_pi) { |
1da177e4 LT |
1422 | struct nd_opt_hdr *p; |
1423 | for (p = ndopts.nd_opts_pi; | |
1424 | p; | |
1425 | p = ndisc_next_option(p, ndopts.nd_opts_pi_end)) { | |
e6bff995 NH |
1426 | addrconf_prefix_rcv(skb->dev, (u8 *)p, |
1427 | (p->nd_opt_len) << 3, | |
1428 | ndopts.nd_opts_src_lladdr != NULL); | |
1da177e4 LT |
1429 | } |
1430 | } | |
1431 | ||
c2943f14 | 1432 | if (ndopts.nd_opts_mtu && in6_dev->cnf.accept_ra_mtu) { |
e69a4adc | 1433 | __be32 n; |
1da177e4 LT |
1434 | u32 mtu; |
1435 | ||
67ba4152 | 1436 | memcpy(&n, ((u8 *)(ndopts.nd_opts_mtu+1))+2, sizeof(mtu)); |
e69a4adc | 1437 | mtu = ntohl(n); |
1da177e4 LT |
1438 | |
1439 | if (mtu < IPV6_MIN_MTU || mtu > skb->dev->mtu) { | |
675418d5 | 1440 | ND_PRINTK(2, warn, "RA: invalid mtu: %d\n", mtu); |
1da177e4 LT |
1441 | } else if (in6_dev->cnf.mtu6 != mtu) { |
1442 | in6_dev->cnf.mtu6 = mtu; | |
1443 | ||
1444 | if (rt) | |
defb3519 | 1445 | dst_metric_set(&rt->dst, RTAX_MTU, mtu); |
1da177e4 LT |
1446 | |
1447 | rt6_mtu_change(skb->dev, mtu); | |
1448 | } | |
1449 | } | |
1ab1457c | 1450 | |
31910575 | 1451 | if (ndopts.nd_useropts) { |
61cf46ad YH |
1452 | struct nd_opt_hdr *p; |
1453 | for (p = ndopts.nd_useropts; | |
1454 | p; | |
f997c55c AA |
1455 | p = ndisc_next_useropt(skb->dev, p, |
1456 | ndopts.nd_useropts_end)) { | |
61cf46ad | 1457 | ndisc_ra_useropt(skb, p); |
31910575 PY |
1458 | } |
1459 | } | |
1460 | ||
1da177e4 | 1461 | if (ndopts.nd_opts_tgt_lladdr || ndopts.nd_opts_rh) { |
675418d5 | 1462 | ND_PRINTK(2, warn, "RA: invalid RA options\n"); |
1da177e4 LT |
1463 | } |
1464 | out: | |
94e187c0 | 1465 | ip6_rt_put(rt); |
eb857186 | 1466 | if (neigh) |
1da177e4 | 1467 | neigh_release(neigh); |
1da177e4 LT |
1468 | } |
1469 | ||
1470 | static void ndisc_redirect_rcv(struct sk_buff *skb) | |
1471 | { | |
093d04d4 DJ |
1472 | u8 *hdr; |
1473 | struct ndisc_options ndopts; | |
1474 | struct rd_msg *msg = (struct rd_msg *)skb_transport_header(skb); | |
29a3cad5 | 1475 | u32 ndoptlen = skb_tail_pointer(skb) - (skb_transport_header(skb) + |
093d04d4 DJ |
1476 | offsetof(struct rd_msg, opt)); |
1477 | ||
de357cc0 | 1478 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 TF |
1479 | switch (skb->ndisc_nodetype) { |
1480 | case NDISC_NODETYPE_HOST: | |
1481 | case NDISC_NODETYPE_NODEFAULT: | |
675418d5 JP |
1482 | ND_PRINTK(2, warn, |
1483 | "Redirect: from host or unauthorized router\n"); | |
fadf6bf0 TF |
1484 | return; |
1485 | } | |
de357cc0 | 1486 | #endif |
fadf6bf0 | 1487 | |
0660e03f | 1488 | if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) { |
675418d5 JP |
1489 | ND_PRINTK(2, warn, |
1490 | "Redirect: source address is not link-local\n"); | |
1da177e4 LT |
1491 | return; |
1492 | } | |
1493 | ||
f997c55c | 1494 | if (!ndisc_parse_options(skb->dev, msg->opt, ndoptlen, &ndopts)) |
093d04d4 DJ |
1495 | return; |
1496 | ||
c92a59ec | 1497 | if (!ndopts.nd_opts_rh) { |
b55b76b2 DJ |
1498 | ip6_redirect_no_header(skb, dev_net(skb->dev), |
1499 | skb->dev->ifindex, 0); | |
093d04d4 | 1500 | return; |
c92a59ec | 1501 | } |
093d04d4 DJ |
1502 | |
1503 | hdr = (u8 *)ndopts.nd_opts_rh; | |
1504 | hdr += 8; | |
1505 | if (!pskb_pull(skb, hdr - skb_transport_header(skb))) | |
1506 | return; | |
1507 | ||
b94f1c09 | 1508 | icmpv6_notify(skb, NDISC_REDIRECT, 0, 0); |
1da177e4 LT |
1509 | } |
1510 | ||
5f5a0115 YH |
1511 | static void ndisc_fill_redirect_hdr_option(struct sk_buff *skb, |
1512 | struct sk_buff *orig_skb, | |
1513 | int rd_len) | |
9c86dafe | 1514 | { |
5f5a0115 YH |
1515 | u8 *opt = skb_put(skb, rd_len); |
1516 | ||
9c86dafe YH |
1517 | memset(opt, 0, 8); |
1518 | *(opt++) = ND_OPT_REDIRECT_HDR; | |
1519 | *(opt++) = (rd_len >> 3); | |
1520 | opt += 6; | |
1521 | ||
1522 | memcpy(opt, ipv6_hdr(orig_skb), rd_len - 8); | |
9c86dafe YH |
1523 | } |
1524 | ||
4991969a | 1525 | void ndisc_send_redirect(struct sk_buff *skb, const struct in6_addr *target) |
1da177e4 | 1526 | { |
1762f7e8 | 1527 | struct net_device *dev = skb->dev; |
c346dca1 | 1528 | struct net *net = dev_net(dev); |
1762f7e8 | 1529 | struct sock *sk = net->ipv6.ndisc_sk; |
2ce13576 | 1530 | int optlen = 0; |
fbfe95a4 | 1531 | struct inet_peer *peer; |
1da177e4 | 1532 | struct sk_buff *buff; |
71bcdba0 | 1533 | struct rd_msg *msg; |
1da177e4 | 1534 | struct in6_addr saddr_buf; |
1da177e4 LT |
1535 | struct rt6_info *rt; |
1536 | struct dst_entry *dst; | |
4c9483b2 | 1537 | struct flowi6 fl6; |
1da177e4 | 1538 | int rd_len; |
f997c55c AA |
1539 | u8 ha_buf[MAX_ADDR_LEN], *ha = NULL, |
1540 | ops_data_buf[NDISC_OPS_REDIRECT_DATA_SPACE], *ops_data = NULL; | |
ca254490 | 1541 | int oif = l3mdev_fib_oif(dev); |
1d861aa4 | 1542 | bool ret; |
1da177e4 | 1543 | |
95c385b4 | 1544 | if (ipv6_get_lladdr(dev, &saddr_buf, IFA_F_TENTATIVE)) { |
675418d5 JP |
1545 | ND_PRINTK(2, warn, "Redirect: no link-local address on %s\n", |
1546 | dev->name); | |
1ab1457c YH |
1547 | return; |
1548 | } | |
1da177e4 | 1549 | |
0660e03f | 1550 | if (!ipv6_addr_equal(&ipv6_hdr(skb)->daddr, target) && |
bf0b48df | 1551 | ipv6_addr_type(target) != (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) { |
675418d5 JP |
1552 | ND_PRINTK(2, warn, |
1553 | "Redirect: target address is not link-local unicast\n"); | |
29556526 LY |
1554 | return; |
1555 | } | |
1556 | ||
4c9483b2 | 1557 | icmpv6_flow_init(sk, &fl6, NDISC_REDIRECT, |
ca254490 DA |
1558 | &saddr_buf, &ipv6_hdr(skb)->saddr, oif); |
1559 | ||
1560 | if (oif != skb->dev->ifindex) | |
1561 | fl6.flowi6_flags |= FLOWI_FLAG_L3MDEV_SRC; | |
1da177e4 | 1562 | |
4c9483b2 | 1563 | dst = ip6_route_output(net, NULL, &fl6); |
5095d64d RL |
1564 | if (dst->error) { |
1565 | dst_release(dst); | |
1da177e4 | 1566 | return; |
5095d64d | 1567 | } |
4c9483b2 | 1568 | dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), NULL, 0); |
452edd59 | 1569 | if (IS_ERR(dst)) |
1da177e4 | 1570 | return; |
1da177e4 LT |
1571 | |
1572 | rt = (struct rt6_info *) dst; | |
1573 | ||
1574 | if (rt->rt6i_flags & RTF_GATEWAY) { | |
675418d5 JP |
1575 | ND_PRINTK(2, warn, |
1576 | "Redirect: destination is not a neighbour\n"); | |
d73f0801 | 1577 | goto release; |
1da177e4 | 1578 | } |
fd0273d7 | 1579 | peer = inet_getpeer_v6(net->ipv6.peers, &ipv6_hdr(skb)->saddr, 1); |
1d861aa4 DM |
1580 | ret = inet_peer_xrlim_allow(peer, 1*HZ); |
1581 | if (peer) | |
1582 | inet_putpeer(peer); | |
1583 | if (!ret) | |
d73f0801 | 1584 | goto release; |
1da177e4 LT |
1585 | |
1586 | if (dev->addr_len) { | |
4991969a DM |
1587 | struct neighbour *neigh = dst_neigh_lookup(skb_dst(skb), target); |
1588 | if (!neigh) { | |
675418d5 JP |
1589 | ND_PRINTK(2, warn, |
1590 | "Redirect: no neigh for target address\n"); | |
4991969a DM |
1591 | goto release; |
1592 | } | |
1593 | ||
1da177e4 LT |
1594 | read_lock_bh(&neigh->lock); |
1595 | if (neigh->nud_state & NUD_VALID) { | |
1596 | memcpy(ha_buf, neigh->ha, dev->addr_len); | |
1597 | read_unlock_bh(&neigh->lock); | |
1598 | ha = ha_buf; | |
f997c55c AA |
1599 | optlen += ndisc_redirect_opt_addr_space(dev, neigh, |
1600 | ops_data_buf, | |
1601 | &ops_data); | |
1da177e4 LT |
1602 | } else |
1603 | read_unlock_bh(&neigh->lock); | |
4991969a DM |
1604 | |
1605 | neigh_release(neigh); | |
1da177e4 LT |
1606 | } |
1607 | ||
1608 | rd_len = min_t(unsigned int, | |
2ce13576 YH |
1609 | IPV6_MIN_MTU - sizeof(struct ipv6hdr) - sizeof(*msg) - optlen, |
1610 | skb->len + 8); | |
1da177e4 | 1611 | rd_len &= ~0x7; |
2ce13576 | 1612 | optlen += rd_len; |
1da177e4 | 1613 | |
2ce13576 | 1614 | buff = ndisc_alloc_skb(dev, sizeof(*msg) + optlen); |
de09334b | 1615 | if (!buff) |
d73f0801 | 1616 | goto release; |
1da177e4 | 1617 | |
4d5c152e YH |
1618 | msg = (struct rd_msg *)skb_put(buff, sizeof(*msg)); |
1619 | *msg = (struct rd_msg) { | |
1620 | .icmph = { | |
1621 | .icmp6_type = NDISC_REDIRECT, | |
1622 | }, | |
1623 | .target = *target, | |
1624 | .dest = ipv6_hdr(skb)->daddr, | |
1625 | }; | |
1da177e4 | 1626 | |
1da177e4 LT |
1627 | /* |
1628 | * include target_address option | |
1629 | */ | |
1630 | ||
1631 | if (ha) | |
f997c55c | 1632 | ndisc_fill_redirect_addr_option(buff, ha, ops_data); |
1da177e4 LT |
1633 | |
1634 | /* | |
1635 | * build redirect option and copy skb over to the new packet. | |
1636 | */ | |
1637 | ||
9c86dafe | 1638 | if (rd_len) |
5f5a0115 | 1639 | ndisc_fill_redirect_hdr_option(buff, skb, rd_len); |
1da177e4 | 1640 | |
adf30907 | 1641 | skb_dst_set(buff, dst); |
f4de84c6 | 1642 | ndisc_send_skb(buff, &ipv6_hdr(skb)->saddr, &saddr_buf); |
d73f0801 IJ |
1643 | return; |
1644 | ||
1645 | release: | |
1646 | dst_release(dst); | |
1da177e4 LT |
1647 | } |
1648 | ||
1649 | static void pndisc_redo(struct sk_buff *skb) | |
1650 | { | |
140e26fc | 1651 | ndisc_recv_ns(skb); |
1da177e4 LT |
1652 | kfree_skb(skb); |
1653 | } | |
1654 | ||
b800c3b9 HFS |
1655 | static bool ndisc_suppress_frag_ndisc(struct sk_buff *skb) |
1656 | { | |
1657 | struct inet6_dev *idev = __in6_dev_get(skb->dev); | |
1658 | ||
1659 | if (!idev) | |
1660 | return true; | |
1661 | if (IP6CB(skb)->flags & IP6SKB_FRAGMENTED && | |
1662 | idev->cnf.suppress_frag_ndisc) { | |
1663 | net_warn_ratelimited("Received fragmented ndisc packet. Carefully consider disabling suppress_frag_ndisc.\n"); | |
1664 | return true; | |
1665 | } | |
1666 | return false; | |
1667 | } | |
1668 | ||
1da177e4 LT |
1669 | int ndisc_rcv(struct sk_buff *skb) |
1670 | { | |
1671 | struct nd_msg *msg; | |
1672 | ||
b800c3b9 HFS |
1673 | if (ndisc_suppress_frag_ndisc(skb)) |
1674 | return 0; | |
1675 | ||
6bce6b4e | 1676 | if (skb_linearize(skb)) |
1da177e4 LT |
1677 | return 0; |
1678 | ||
9c70220b | 1679 | msg = (struct nd_msg *)skb_transport_header(skb); |
1da177e4 | 1680 | |
9c70220b | 1681 | __skb_push(skb, skb->data - skb_transport_header(skb)); |
1da177e4 | 1682 | |
0660e03f | 1683 | if (ipv6_hdr(skb)->hop_limit != 255) { |
675418d5 JP |
1684 | ND_PRINTK(2, warn, "NDISC: invalid hop-limit: %d\n", |
1685 | ipv6_hdr(skb)->hop_limit); | |
1da177e4 LT |
1686 | return 0; |
1687 | } | |
1688 | ||
1689 | if (msg->icmph.icmp6_code != 0) { | |
675418d5 JP |
1690 | ND_PRINTK(2, warn, "NDISC: invalid ICMPv6 code: %d\n", |
1691 | msg->icmph.icmp6_code); | |
1da177e4 LT |
1692 | return 0; |
1693 | } | |
1694 | ||
a61bbcf2 PM |
1695 | memset(NEIGH_CB(skb), 0, sizeof(struct neighbour_cb)); |
1696 | ||
1da177e4 LT |
1697 | switch (msg->icmph.icmp6_type) { |
1698 | case NDISC_NEIGHBOUR_SOLICITATION: | |
1699 | ndisc_recv_ns(skb); | |
1700 | break; | |
1701 | ||
1702 | case NDISC_NEIGHBOUR_ADVERTISEMENT: | |
1703 | ndisc_recv_na(skb); | |
1704 | break; | |
1705 | ||
1706 | case NDISC_ROUTER_SOLICITATION: | |
1707 | ndisc_recv_rs(skb); | |
1708 | break; | |
1709 | ||
1710 | case NDISC_ROUTER_ADVERTISEMENT: | |
1711 | ndisc_router_discovery(skb); | |
1712 | break; | |
1713 | ||
1714 | case NDISC_REDIRECT: | |
1715 | ndisc_redirect_rcv(skb); | |
1716 | break; | |
3ff50b79 | 1717 | } |
1da177e4 LT |
1718 | |
1719 | return 0; | |
1720 | } | |
1721 | ||
1722 | static int ndisc_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1723 | { | |
351638e7 | 1724 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
c8507fb2 | 1725 | struct netdev_notifier_change_info *change_info; |
c346dca1 | 1726 | struct net *net = dev_net(dev); |
5cb04436 | 1727 | struct inet6_dev *idev; |
1da177e4 LT |
1728 | |
1729 | switch (event) { | |
1730 | case NETDEV_CHANGEADDR: | |
1731 | neigh_changeaddr(&nd_tbl, dev); | |
2ac3ac8f | 1732 | fib6_run_gc(0, net, false); |
5cb04436 HFS |
1733 | idev = in6_dev_get(dev); |
1734 | if (!idev) | |
1735 | break; | |
1736 | if (idev->cnf.ndisc_notify) | |
1737 | ndisc_send_unsol_na(dev); | |
1738 | in6_dev_put(idev); | |
1da177e4 | 1739 | break; |
c8507fb2 ED |
1740 | case NETDEV_CHANGE: |
1741 | change_info = ptr; | |
1742 | if (change_info->flags_changed & IFF_NOARP) | |
1743 | neigh_changeaddr(&nd_tbl, dev); | |
1744 | break; | |
1da177e4 LT |
1745 | case NETDEV_DOWN: |
1746 | neigh_ifdown(&nd_tbl, dev); | |
2ac3ac8f | 1747 | fib6_run_gc(0, net, false); |
1da177e4 | 1748 | break; |
f47b9464 BH |
1749 | case NETDEV_NOTIFY_PEERS: |
1750 | ndisc_send_unsol_na(dev); | |
1751 | break; | |
1da177e4 LT |
1752 | default: |
1753 | break; | |
1754 | } | |
1755 | ||
1756 | return NOTIFY_DONE; | |
1757 | } | |
1758 | ||
1759 | static struct notifier_block ndisc_netdev_notifier = { | |
1760 | .notifier_call = ndisc_netdev_event, | |
1761 | }; | |
1762 | ||
1763 | #ifdef CONFIG_SYSCTL | |
1764 | static void ndisc_warn_deprecated_sysctl(struct ctl_table *ctl, | |
1765 | const char *func, const char *dev_name) | |
1766 | { | |
1767 | static char warncomm[TASK_COMM_LEN]; | |
1768 | static int warned; | |
1769 | if (strcmp(warncomm, current->comm) && warned < 5) { | |
1770 | strcpy(warncomm, current->comm); | |
f3213831 | 1771 | 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 |
1772 | warncomm, func, |
1773 | dev_name, ctl->procname, | |
1774 | dev_name, ctl->procname); | |
1775 | warned++; | |
1776 | } | |
1777 | } | |
1778 | ||
8d65af78 | 1779 | int ndisc_ifinfo_sysctl_change(struct ctl_table *ctl, int write, void __user *buffer, size_t *lenp, loff_t *ppos) |
1da177e4 LT |
1780 | { |
1781 | struct net_device *dev = ctl->extra1; | |
1782 | struct inet6_dev *idev; | |
1783 | int ret; | |
1784 | ||
d12af679 EB |
1785 | if ((strcmp(ctl->procname, "retrans_time") == 0) || |
1786 | (strcmp(ctl->procname, "base_reachable_time") == 0)) | |
1da177e4 LT |
1787 | ndisc_warn_deprecated_sysctl(ctl, "syscall", dev ? dev->name : "default"); |
1788 | ||
d12af679 | 1789 | if (strcmp(ctl->procname, "retrans_time") == 0) |
cb5b09c1 | 1790 | ret = neigh_proc_dointvec(ctl, write, buffer, lenp, ppos); |
d12af679 EB |
1791 | |
1792 | else if (strcmp(ctl->procname, "base_reachable_time") == 0) | |
cb5b09c1 JP |
1793 | ret = neigh_proc_dointvec_jiffies(ctl, write, |
1794 | buffer, lenp, ppos); | |
d12af679 EB |
1795 | |
1796 | else if ((strcmp(ctl->procname, "retrans_time_ms") == 0) || | |
ad02ac14 | 1797 | (strcmp(ctl->procname, "base_reachable_time_ms") == 0)) |
cb5b09c1 JP |
1798 | ret = neigh_proc_dointvec_ms_jiffies(ctl, write, |
1799 | buffer, lenp, ppos); | |
d12af679 | 1800 | else |
1da177e4 | 1801 | ret = -1; |
1da177e4 LT |
1802 | |
1803 | if (write && ret == 0 && dev && (idev = in6_dev_get(dev)) != NULL) { | |
1f9248e5 JP |
1804 | if (ctl->data == &NEIGH_VAR(idev->nd_parms, BASE_REACHABLE_TIME)) |
1805 | idev->nd_parms->reachable_time = | |
1806 | neigh_rand_reach_time(NEIGH_VAR(idev->nd_parms, BASE_REACHABLE_TIME)); | |
1da177e4 LT |
1807 | idev->tstamp = jiffies; |
1808 | inet6_ifinfo_notify(RTM_NEWLINK, idev); | |
1809 | in6_dev_put(idev); | |
1810 | } | |
1811 | return ret; | |
1812 | } | |
1813 | ||
1da177e4 LT |
1814 | |
1815 | #endif | |
1816 | ||
2c8c1e72 | 1817 | static int __net_init ndisc_net_init(struct net *net) |
1da177e4 LT |
1818 | { |
1819 | struct ipv6_pinfo *np; | |
1820 | struct sock *sk; | |
1ab1457c | 1821 | int err; |
1da177e4 | 1822 | |
1ed8516f DL |
1823 | err = inet_ctl_sock_create(&sk, PF_INET6, |
1824 | SOCK_RAW, IPPROTO_ICMPV6, net); | |
1da177e4 | 1825 | if (err < 0) { |
675418d5 JP |
1826 | ND_PRINTK(0, err, |
1827 | "NDISC: Failed to initialize the control socket (err %d)\n", | |
1828 | err); | |
1da177e4 LT |
1829 | return err; |
1830 | } | |
1831 | ||
1ed8516f | 1832 | net->ipv6.ndisc_sk = sk; |
1762f7e8 | 1833 | |
1da177e4 | 1834 | np = inet6_sk(sk); |
1da177e4 LT |
1835 | np->hop_limit = 255; |
1836 | /* Do not loopback ndisc messages */ | |
1837 | np->mc_loop = 0; | |
1da177e4 | 1838 | |
1762f7e8 DL |
1839 | return 0; |
1840 | } | |
1841 | ||
2c8c1e72 | 1842 | static void __net_exit ndisc_net_exit(struct net *net) |
1762f7e8 | 1843 | { |
1ed8516f | 1844 | inet_ctl_sock_destroy(net->ipv6.ndisc_sk); |
1762f7e8 DL |
1845 | } |
1846 | ||
1847 | static struct pernet_operations ndisc_net_ops = { | |
1848 | .init = ndisc_net_init, | |
1849 | .exit = ndisc_net_exit, | |
1850 | }; | |
1851 | ||
1852 | int __init ndisc_init(void) | |
1853 | { | |
1854 | int err; | |
1855 | ||
1856 | err = register_pernet_subsys(&ndisc_net_ops); | |
1857 | if (err) | |
1858 | return err; | |
1ab1457c YH |
1859 | /* |
1860 | * Initialize the neighbour table | |
1861 | */ | |
d7480fd3 | 1862 | neigh_table_init(NEIGH_ND_TABLE, &nd_tbl); |
1da177e4 LT |
1863 | |
1864 | #ifdef CONFIG_SYSCTL | |
73af614a | 1865 | err = neigh_sysctl_register(NULL, &nd_tbl.parms, |
56ec0fb1 | 1866 | ndisc_ifinfo_sysctl_change); |
1762f7e8 DL |
1867 | if (err) |
1868 | goto out_unregister_pernet; | |
1762f7e8 | 1869 | out: |
bcd081a3 | 1870 | #endif |
1762f7e8 | 1871 | return err; |
1da177e4 | 1872 | |
1762f7e8 | 1873 | #ifdef CONFIG_SYSCTL |
1762f7e8 | 1874 | out_unregister_pernet: |
1762f7e8 DL |
1875 | unregister_pernet_subsys(&ndisc_net_ops); |
1876 | goto out; | |
2c861cc6 | 1877 | #endif |
1da177e4 LT |
1878 | } |
1879 | ||
2c861cc6 MK |
1880 | int __init ndisc_late_init(void) |
1881 | { | |
1882 | return register_netdevice_notifier(&ndisc_netdev_notifier); | |
1883 | } | |
1884 | ||
1885 | void ndisc_late_cleanup(void) | |
1da177e4 | 1886 | { |
36f73d0c | 1887 | unregister_netdevice_notifier(&ndisc_netdev_notifier); |
2c861cc6 MK |
1888 | } |
1889 | ||
1890 | void ndisc_cleanup(void) | |
1891 | { | |
1da177e4 LT |
1892 | #ifdef CONFIG_SYSCTL |
1893 | neigh_sysctl_unregister(&nd_tbl.parms); | |
1894 | #endif | |
d7480fd3 | 1895 | neigh_table_clear(NEIGH_ND_TABLE, &nd_tbl); |
1762f7e8 | 1896 | unregister_pernet_subsys(&ndisc_net_ops); |
1da177e4 | 1897 | } |