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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> |
1da177e4 LT |
70 | #include <linux/proc_fs.h> |
71 | ||
72 | #include <linux/netfilter.h> | |
73 | #include <linux/netfilter_ipv6.h> | |
74 | ||
675418d5 JP |
75 | /* Set to 3 to get tracing... */ |
76 | #define ND_DEBUG 1 | |
77 | ||
78 | #define ND_PRINTK(val, level, fmt, ...) \ | |
79 | do { \ | |
80 | if (val <= ND_DEBUG) \ | |
81 | net_##level##_ratelimited(fmt, ##__VA_ARGS__); \ | |
82 | } while (0) | |
83 | ||
d6bf7817 ED |
84 | static u32 ndisc_hash(const void *pkey, |
85 | const struct net_device *dev, | |
2c2aba6c | 86 | __u32 *hash_rnd); |
60395a20 | 87 | static bool ndisc_key_eq(const struct neighbour *neigh, const void *pkey); |
1da177e4 LT |
88 | static int ndisc_constructor(struct neighbour *neigh); |
89 | static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb); | |
90 | static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb); | |
91 | static int pndisc_constructor(struct pneigh_entry *n); | |
92 | static void pndisc_destructor(struct pneigh_entry *n); | |
93 | static void pndisc_redo(struct sk_buff *skb); | |
94 | ||
89d69d2b | 95 | static const struct neigh_ops ndisc_generic_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_connected_output, | |
1da177e4 LT |
101 | }; |
102 | ||
89d69d2b | 103 | static const struct neigh_ops ndisc_hh_ops = { |
1da177e4 LT |
104 | .family = AF_INET6, |
105 | .solicit = ndisc_solicit, | |
106 | .error_report = ndisc_error_report, | |
107 | .output = neigh_resolve_output, | |
108 | .connected_output = neigh_resolve_output, | |
1da177e4 LT |
109 | }; |
110 | ||
111 | ||
89d69d2b | 112 | static const struct neigh_ops ndisc_direct_ops = { |
1da177e4 | 113 | .family = AF_INET6, |
8f40b161 DM |
114 | .output = neigh_direct_output, |
115 | .connected_output = neigh_direct_output, | |
1da177e4 LT |
116 | }; |
117 | ||
118 | struct neigh_table nd_tbl = { | |
119 | .family = AF_INET6, | |
1da177e4 | 120 | .key_len = sizeof(struct in6_addr), |
bdf53c58 | 121 | .protocol = cpu_to_be16(ETH_P_IPV6), |
1da177e4 | 122 | .hash = ndisc_hash, |
60395a20 | 123 | .key_eq = ndisc_key_eq, |
1da177e4 LT |
124 | .constructor = ndisc_constructor, |
125 | .pconstructor = pndisc_constructor, | |
126 | .pdestructor = pndisc_destructor, | |
127 | .proxy_redo = pndisc_redo, | |
128 | .id = "ndisc_cache", | |
129 | .parms = { | |
b672083e | 130 | .tbl = &nd_tbl, |
b672083e | 131 | .reachable_time = ND_REACHABLE_TIME, |
1f9248e5 JP |
132 | .data = { |
133 | [NEIGH_VAR_MCAST_PROBES] = 3, | |
134 | [NEIGH_VAR_UCAST_PROBES] = 3, | |
135 | [NEIGH_VAR_RETRANS_TIME] = ND_RETRANS_TIMER, | |
136 | [NEIGH_VAR_BASE_REACHABLE_TIME] = ND_REACHABLE_TIME, | |
137 | [NEIGH_VAR_DELAY_PROBE_TIME] = 5 * HZ, | |
138 | [NEIGH_VAR_GC_STALETIME] = 60 * HZ, | |
139 | [NEIGH_VAR_QUEUE_LEN_BYTES] = 64 * 1024, | |
140 | [NEIGH_VAR_PROXY_QLEN] = 64, | |
141 | [NEIGH_VAR_ANYCAST_DELAY] = 1 * HZ, | |
142 | [NEIGH_VAR_PROXY_DELAY] = (8 * HZ) / 10, | |
143 | }, | |
1da177e4 LT |
144 | }, |
145 | .gc_interval = 30 * HZ, | |
146 | .gc_thresh1 = 128, | |
147 | .gc_thresh2 = 512, | |
148 | .gc_thresh3 = 1024, | |
149 | }; | |
150 | ||
5f5a0115 | 151 | static void ndisc_fill_addr_option(struct sk_buff *skb, int type, void *data) |
1da177e4 | 152 | { |
5f5a0115 YH |
153 | int pad = ndisc_addr_option_pad(skb->dev->type); |
154 | int data_len = skb->dev->addr_len; | |
155 | int space = ndisc_opt_addr_space(skb->dev); | |
156 | u8 *opt = skb_put(skb, space); | |
1da177e4 LT |
157 | |
158 | opt[0] = type; | |
159 | opt[1] = space>>3; | |
160 | ||
161 | memset(opt + 2, 0, pad); | |
162 | opt += pad; | |
163 | space -= pad; | |
164 | ||
165 | memcpy(opt+2, data, data_len); | |
166 | data_len += 2; | |
167 | opt += data_len; | |
e5d08d71 IM |
168 | space -= data_len; |
169 | if (space > 0) | |
1da177e4 | 170 | memset(opt, 0, space); |
1da177e4 LT |
171 | } |
172 | ||
173 | static struct nd_opt_hdr *ndisc_next_option(struct nd_opt_hdr *cur, | |
174 | struct nd_opt_hdr *end) | |
175 | { | |
176 | int type; | |
177 | if (!cur || !end || cur >= end) | |
178 | return NULL; | |
179 | type = cur->nd_opt_type; | |
180 | do { | |
181 | cur = ((void *)cur) + (cur->nd_opt_len << 3); | |
67ba4152 | 182 | } while (cur < end && cur->nd_opt_type != type); |
a02cec21 | 183 | return cur <= end && cur->nd_opt_type == type ? cur : NULL; |
1da177e4 LT |
184 | } |
185 | ||
31910575 PY |
186 | static inline int ndisc_is_useropt(struct nd_opt_hdr *opt) |
187 | { | |
e35f30c1 AF |
188 | return opt->nd_opt_type == ND_OPT_RDNSS || |
189 | opt->nd_opt_type == ND_OPT_DNSSL; | |
31910575 PY |
190 | } |
191 | ||
192 | static struct nd_opt_hdr *ndisc_next_useropt(struct nd_opt_hdr *cur, | |
193 | struct nd_opt_hdr *end) | |
194 | { | |
195 | if (!cur || !end || cur >= end) | |
196 | return NULL; | |
197 | do { | |
198 | cur = ((void *)cur) + (cur->nd_opt_len << 3); | |
67ba4152 | 199 | } while (cur < end && !ndisc_is_useropt(cur)); |
a02cec21 | 200 | return cur <= end && ndisc_is_useropt(cur) ? cur : NULL; |
31910575 PY |
201 | } |
202 | ||
30f2a5f3 DM |
203 | struct ndisc_options *ndisc_parse_options(u8 *opt, int opt_len, |
204 | struct ndisc_options *ndopts) | |
1da177e4 LT |
205 | { |
206 | struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)opt; | |
207 | ||
208 | if (!nd_opt || opt_len < 0 || !ndopts) | |
209 | return NULL; | |
210 | memset(ndopts, 0, sizeof(*ndopts)); | |
211 | while (opt_len) { | |
212 | int l; | |
213 | if (opt_len < sizeof(struct nd_opt_hdr)) | |
214 | return NULL; | |
215 | l = nd_opt->nd_opt_len << 3; | |
216 | if (opt_len < l || l == 0) | |
217 | return NULL; | |
218 | switch (nd_opt->nd_opt_type) { | |
219 | case ND_OPT_SOURCE_LL_ADDR: | |
220 | case ND_OPT_TARGET_LL_ADDR: | |
221 | case ND_OPT_MTU: | |
222 | case ND_OPT_REDIRECT_HDR: | |
223 | if (ndopts->nd_opt_array[nd_opt->nd_opt_type]) { | |
675418d5 JP |
224 | ND_PRINTK(2, warn, |
225 | "%s: duplicated ND6 option found: type=%d\n", | |
226 | __func__, nd_opt->nd_opt_type); | |
1da177e4 LT |
227 | } else { |
228 | ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt; | |
229 | } | |
230 | break; | |
231 | case ND_OPT_PREFIX_INFO: | |
232 | ndopts->nd_opts_pi_end = nd_opt; | |
cfcabdcc | 233 | if (!ndopts->nd_opt_array[nd_opt->nd_opt_type]) |
1da177e4 LT |
234 | ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt; |
235 | break; | |
70ceb4f5 YH |
236 | #ifdef CONFIG_IPV6_ROUTE_INFO |
237 | case ND_OPT_ROUTE_INFO: | |
238 | ndopts->nd_opts_ri_end = nd_opt; | |
239 | if (!ndopts->nd_opts_ri) | |
240 | ndopts->nd_opts_ri = nd_opt; | |
241 | break; | |
242 | #endif | |
1da177e4 | 243 | default: |
31910575 PY |
244 | if (ndisc_is_useropt(nd_opt)) { |
245 | ndopts->nd_useropts_end = nd_opt; | |
246 | if (!ndopts->nd_useropts) | |
247 | ndopts->nd_useropts = nd_opt; | |
248 | } else { | |
249 | /* | |
250 | * Unknown options must be silently ignored, | |
251 | * to accommodate future extension to the | |
252 | * protocol. | |
253 | */ | |
675418d5 JP |
254 | ND_PRINTK(2, notice, |
255 | "%s: ignored unsupported option; type=%d, len=%d\n", | |
256 | __func__, | |
257 | nd_opt->nd_opt_type, | |
258 | nd_opt->nd_opt_len); | |
31910575 | 259 | } |
1da177e4 LT |
260 | } |
261 | opt_len -= l; | |
262 | nd_opt = ((void *)nd_opt) + l; | |
263 | } | |
264 | return ndopts; | |
265 | } | |
266 | ||
b71d1d42 | 267 | int ndisc_mc_map(const struct in6_addr *addr, char *buf, struct net_device *dev, int dir) |
1da177e4 LT |
268 | { |
269 | switch (dev->type) { | |
270 | case ARPHRD_ETHER: | |
271 | case ARPHRD_IEEE802: /* Not sure. Check it later. --ANK */ | |
272 | case ARPHRD_FDDI: | |
273 | ipv6_eth_mc_map(addr, buf); | |
274 | return 0; | |
1da177e4 LT |
275 | case ARPHRD_ARCNET: |
276 | ipv6_arcnet_mc_map(addr, buf); | |
277 | return 0; | |
278 | case ARPHRD_INFINIBAND: | |
a9e527e3 | 279 | ipv6_ib_mc_map(addr, dev->broadcast, buf); |
1da177e4 | 280 | return 0; |
93ca3bb5 TT |
281 | case ARPHRD_IPGRE: |
282 | return ipv6_ipgre_mc_map(addr, dev->broadcast, buf); | |
1da177e4 LT |
283 | default: |
284 | if (dir) { | |
285 | memcpy(buf, dev->broadcast, dev->addr_len); | |
286 | return 0; | |
287 | } | |
288 | } | |
289 | return -EINVAL; | |
290 | } | |
7159039a YH |
291 | EXPORT_SYMBOL(ndisc_mc_map); |
292 | ||
d6bf7817 ED |
293 | static u32 ndisc_hash(const void *pkey, |
294 | const struct net_device *dev, | |
2c2aba6c | 295 | __u32 *hash_rnd) |
1da177e4 | 296 | { |
2c2aba6c | 297 | return ndisc_hashfn(pkey, dev, hash_rnd); |
1da177e4 LT |
298 | } |
299 | ||
60395a20 EB |
300 | static bool ndisc_key_eq(const struct neighbour *n, const void *pkey) |
301 | { | |
302 | return neigh_key_eq128(n, pkey); | |
303 | } | |
304 | ||
1da177e4 LT |
305 | static int ndisc_constructor(struct neighbour *neigh) |
306 | { | |
67ba4152 | 307 | struct in6_addr *addr = (struct in6_addr *)&neigh->primary_key; |
1da177e4 LT |
308 | struct net_device *dev = neigh->dev; |
309 | struct inet6_dev *in6_dev; | |
310 | struct neigh_parms *parms; | |
a50feda5 | 311 | bool is_multicast = ipv6_addr_is_multicast(addr); |
1da177e4 | 312 | |
1da177e4 | 313 | in6_dev = in6_dev_get(dev); |
63159f29 | 314 | if (!in6_dev) { |
1da177e4 LT |
315 | return -EINVAL; |
316 | } | |
317 | ||
318 | parms = in6_dev->nd_parms; | |
319 | __neigh_parms_put(neigh->parms); | |
320 | neigh->parms = neigh_parms_clone(parms); | |
1da177e4 LT |
321 | |
322 | neigh->type = is_multicast ? RTN_MULTICAST : RTN_UNICAST; | |
3b04ddde | 323 | if (!dev->header_ops) { |
1da177e4 LT |
324 | neigh->nud_state = NUD_NOARP; |
325 | neigh->ops = &ndisc_direct_ops; | |
8f40b161 | 326 | neigh->output = neigh_direct_output; |
1da177e4 LT |
327 | } else { |
328 | if (is_multicast) { | |
329 | neigh->nud_state = NUD_NOARP; | |
330 | ndisc_mc_map(addr, neigh->ha, dev, 1); | |
331 | } else if (dev->flags&(IFF_NOARP|IFF_LOOPBACK)) { | |
332 | neigh->nud_state = NUD_NOARP; | |
333 | memcpy(neigh->ha, dev->dev_addr, dev->addr_len); | |
334 | if (dev->flags&IFF_LOOPBACK) | |
335 | neigh->type = RTN_LOCAL; | |
336 | } else if (dev->flags&IFF_POINTOPOINT) { | |
337 | neigh->nud_state = NUD_NOARP; | |
338 | memcpy(neigh->ha, dev->broadcast, dev->addr_len); | |
339 | } | |
3b04ddde | 340 | if (dev->header_ops->cache) |
1da177e4 LT |
341 | neigh->ops = &ndisc_hh_ops; |
342 | else | |
343 | neigh->ops = &ndisc_generic_ops; | |
344 | if (neigh->nud_state&NUD_VALID) | |
345 | neigh->output = neigh->ops->connected_output; | |
346 | else | |
347 | neigh->output = neigh->ops->output; | |
348 | } | |
349 | in6_dev_put(in6_dev); | |
350 | return 0; | |
351 | } | |
352 | ||
353 | static int pndisc_constructor(struct pneigh_entry *n) | |
354 | { | |
67ba4152 | 355 | struct in6_addr *addr = (struct in6_addr *)&n->key; |
1da177e4 LT |
356 | struct in6_addr maddr; |
357 | struct net_device *dev = n->dev; | |
358 | ||
63159f29 | 359 | if (!dev || !__in6_dev_get(dev)) |
1da177e4 LT |
360 | return -EINVAL; |
361 | addrconf_addr_solict_mult(addr, &maddr); | |
362 | ipv6_dev_mc_inc(dev, &maddr); | |
363 | return 0; | |
364 | } | |
365 | ||
366 | static void pndisc_destructor(struct pneigh_entry *n) | |
367 | { | |
67ba4152 | 368 | struct in6_addr *addr = (struct in6_addr *)&n->key; |
1da177e4 LT |
369 | struct in6_addr maddr; |
370 | struct net_device *dev = n->dev; | |
371 | ||
63159f29 | 372 | if (!dev || !__in6_dev_get(dev)) |
1da177e4 LT |
373 | return; |
374 | addrconf_addr_solict_mult(addr, &maddr); | |
375 | ipv6_dev_mc_dec(dev, &maddr); | |
376 | } | |
377 | ||
de09334b YH |
378 | static struct sk_buff *ndisc_alloc_skb(struct net_device *dev, |
379 | int len) | |
380 | { | |
381 | int hlen = LL_RESERVED_SPACE(dev); | |
382 | int tlen = dev->needed_tailroom; | |
383 | struct sock *sk = dev_net(dev)->ipv6.ndisc_sk; | |
384 | struct sk_buff *skb; | |
de09334b | 385 | |
25a6e6b8 | 386 | skb = alloc_skb(hlen + sizeof(struct ipv6hdr) + len + tlen, GFP_ATOMIC); |
de09334b | 387 | if (!skb) { |
25a6e6b8 TG |
388 | ND_PRINTK(0, err, "ndisc: %s failed to allocate an skb\n", |
389 | __func__); | |
de09334b YH |
390 | return NULL; |
391 | } | |
392 | ||
f382d03a YH |
393 | skb->protocol = htons(ETH_P_IPV6); |
394 | skb->dev = dev; | |
395 | ||
527a150f | 396 | skb_reserve(skb, hlen + sizeof(struct ipv6hdr)); |
5135e633 | 397 | skb_reset_transport_header(skb); |
de09334b | 398 | |
25a6e6b8 TG |
399 | /* Manually assign socket ownership as we avoid calling |
400 | * sock_alloc_send_pskb() to bypass wmem buffer limits | |
401 | */ | |
402 | skb_set_owner_w(skb, sk); | |
403 | ||
de09334b YH |
404 | return skb; |
405 | } | |
406 | ||
f382d03a | 407 | static void ip6_nd_hdr(struct sk_buff *skb, |
2576f17d YH |
408 | const struct in6_addr *saddr, |
409 | const struct in6_addr *daddr, | |
c8d6c380 | 410 | int hop_limit, int len) |
2576f17d YH |
411 | { |
412 | struct ipv6hdr *hdr; | |
413 | ||
527a150f | 414 | skb_push(skb, sizeof(*hdr)); |
2576f17d | 415 | skb_reset_network_header(skb); |
2576f17d YH |
416 | hdr = ipv6_hdr(skb); |
417 | ||
418 | ip6_flow_hdr(hdr, 0, 0); | |
419 | ||
420 | hdr->payload_len = htons(len); | |
c8d6c380 YH |
421 | hdr->nexthdr = IPPROTO_ICMPV6; |
422 | hdr->hop_limit = hop_limit; | |
2576f17d YH |
423 | |
424 | hdr->saddr = *saddr; | |
425 | hdr->daddr = *daddr; | |
426 | } | |
427 | ||
af9a9976 | 428 | static void ndisc_send_skb(struct sk_buff *skb, |
fd0ea7db | 429 | const struct in6_addr *daddr, |
aa4bdd4b | 430 | const struct in6_addr *saddr) |
305d552a | 431 | { |
f4de84c6 | 432 | struct dst_entry *dst = skb_dst(skb); |
af9a9976 | 433 | struct net *net = dev_net(skb->dev); |
7b3d9b06 | 434 | struct sock *sk = net->ipv6.ndisc_sk; |
305d552a BH |
435 | struct inet6_dev *idev; |
436 | int err; | |
aa4bdd4b | 437 | struct icmp6hdr *icmp6h = icmp6_hdr(skb); |
305d552a BH |
438 | u8 type; |
439 | ||
440 | type = icmp6h->icmp6_type; | |
441 | ||
f4de84c6 | 442 | if (!dst) { |
f4de84c6 | 443 | struct flowi6 fl6; |
305d552a | 444 | |
f4de84c6 YH |
445 | icmpv6_flow_init(sk, &fl6, type, saddr, daddr, skb->dev->ifindex); |
446 | dst = icmp6_dst_alloc(skb->dev, &fl6); | |
447 | if (IS_ERR(dst)) { | |
448 | kfree_skb(skb); | |
449 | return; | |
450 | } | |
451 | ||
452 | skb_dst_set(skb, dst); | |
453 | } | |
e1ec7842 | 454 | |
7b3d9b06 YH |
455 | icmp6h->icmp6_cksum = csum_ipv6_magic(saddr, daddr, skb->len, |
456 | IPPROTO_ICMPV6, | |
457 | csum_partial(icmp6h, | |
458 | skb->len, 0)); | |
459 | ||
460 | ip6_nd_hdr(skb, saddr, daddr, inet6_sk(sk)->hop_limit, skb->len); | |
461 | ||
cfdf7647 ED |
462 | rcu_read_lock(); |
463 | idev = __in6_dev_get(dst->dev); | |
edf391ff | 464 | IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len); |
e1ec7842 | 465 | |
b2e0b385 | 466 | err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, dst->dev, |
6e23ae2a | 467 | dst_output); |
1da177e4 | 468 | if (!err) { |
5c5d244b | 469 | ICMP6MSGOUT_INC_STATS(net, idev, type); |
a862f6a6 | 470 | ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); |
1da177e4 LT |
471 | } |
472 | ||
cfdf7647 | 473 | rcu_read_unlock(); |
1ab1457c | 474 | } |
1da177e4 | 475 | |
f564f45c CW |
476 | void ndisc_send_na(struct net_device *dev, struct neighbour *neigh, |
477 | const struct in6_addr *daddr, | |
478 | const struct in6_addr *solicited_addr, | |
479 | bool router, bool solicited, bool override, bool inc_opt) | |
e1ec7842 | 480 | { |
b44b5f4a | 481 | struct sk_buff *skb; |
e1ec7842 YH |
482 | struct in6_addr tmpaddr; |
483 | struct inet6_ifaddr *ifp; | |
9acd9f3a | 484 | const struct in6_addr *src_addr; |
1cb3fe51 YH |
485 | struct nd_msg *msg; |
486 | int optlen = 0; | |
e1ec7842 YH |
487 | |
488 | /* for anycast or proxy, solicited_addr != src_addr */ | |
c346dca1 | 489 | ifp = ipv6_get_ifaddr(dev_net(dev), solicited_addr, dev, 1); |
e1ec7842 YH |
490 | if (ifp) { |
491 | src_addr = solicited_addr; | |
492 | if (ifp->flags & IFA_F_OPTIMISTIC) | |
f2f79cca | 493 | override = false; |
9f888160 | 494 | inc_opt |= ifp->idev->cnf.force_tllao; |
e1ec7842 YH |
495 | in6_ifa_put(ifp); |
496 | } else { | |
191cd582 | 497 | if (ipv6_dev_get_saddr(dev_net(dev), dev, daddr, |
c346dca1 | 498 | inet6_sk(dev_net(dev)->ipv6.ndisc_sk)->srcprefs, |
7cbca67c | 499 | &tmpaddr)) |
e1ec7842 YH |
500 | return; |
501 | src_addr = &tmpaddr; | |
502 | } | |
503 | ||
1cb3fe51 YH |
504 | if (!dev->addr_len) |
505 | inc_opt = 0; | |
506 | if (inc_opt) | |
507 | optlen += ndisc_opt_addr_space(dev); | |
e1ec7842 | 508 | |
1cb3fe51 | 509 | skb = ndisc_alloc_skb(dev, sizeof(*msg) + optlen); |
b44b5f4a YH |
510 | if (!skb) |
511 | return; | |
512 | ||
1cb3fe51 YH |
513 | msg = (struct nd_msg *)skb_put(skb, sizeof(*msg)); |
514 | *msg = (struct nd_msg) { | |
515 | .icmph = { | |
516 | .icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT, | |
517 | .icmp6_router = router, | |
518 | .icmp6_solicited = solicited, | |
519 | .icmp6_override = override, | |
520 | }, | |
521 | .target = *solicited_addr, | |
522 | }; | |
523 | ||
524 | if (inc_opt) | |
525 | ndisc_fill_addr_option(skb, ND_OPT_TARGET_LL_ADDR, | |
526 | dev->dev_addr); | |
527 | ||
528 | ||
b44b5f4a | 529 | ndisc_send_skb(skb, daddr, src_addr); |
e1ec7842 YH |
530 | } |
531 | ||
f47b9464 BH |
532 | static void ndisc_send_unsol_na(struct net_device *dev) |
533 | { | |
534 | struct inet6_dev *idev; | |
535 | struct inet6_ifaddr *ifa; | |
f47b9464 BH |
536 | |
537 | idev = in6_dev_get(dev); | |
538 | if (!idev) | |
539 | return; | |
540 | ||
541 | read_lock_bh(&idev->lock); | |
542 | list_for_each_entry(ifa, &idev->addr_list, if_list) { | |
9fafd65a | 543 | ndisc_send_na(dev, NULL, &in6addr_linklocal_allnodes, &ifa->addr, |
f47b9464 BH |
544 | /*router=*/ !!idev->cnf.forwarding, |
545 | /*solicited=*/ false, /*override=*/ true, | |
546 | /*inc_opt=*/ true); | |
547 | } | |
548 | read_unlock_bh(&idev->lock); | |
549 | ||
550 | in6_dev_put(idev); | |
551 | } | |
552 | ||
1da177e4 | 553 | void ndisc_send_ns(struct net_device *dev, struct neighbour *neigh, |
9acd9f3a YH |
554 | const struct in6_addr *solicit, |
555 | const struct in6_addr *daddr, const struct in6_addr *saddr) | |
1da177e4 | 556 | { |
b44b5f4a | 557 | struct sk_buff *skb; |
1da177e4 | 558 | struct in6_addr addr_buf; |
1cb3fe51 YH |
559 | int inc_opt = dev->addr_len; |
560 | int optlen = 0; | |
561 | struct nd_msg *msg; | |
1da177e4 | 562 | |
63159f29 | 563 | if (!saddr) { |
95c385b4 NH |
564 | if (ipv6_get_lladdr(dev, &addr_buf, |
565 | (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC))) | |
1da177e4 LT |
566 | return; |
567 | saddr = &addr_buf; | |
568 | } | |
569 | ||
1cb3fe51 | 570 | if (ipv6_addr_any(saddr)) |
f2f79cca | 571 | inc_opt = false; |
1cb3fe51 YH |
572 | if (inc_opt) |
573 | optlen += ndisc_opt_addr_space(dev); | |
574 | ||
575 | skb = ndisc_alloc_skb(dev, sizeof(*msg) + optlen); | |
b44b5f4a YH |
576 | if (!skb) |
577 | return; | |
578 | ||
1cb3fe51 YH |
579 | msg = (struct nd_msg *)skb_put(skb, sizeof(*msg)); |
580 | *msg = (struct nd_msg) { | |
581 | .icmph = { | |
582 | .icmp6_type = NDISC_NEIGHBOUR_SOLICITATION, | |
583 | }, | |
584 | .target = *solicit, | |
585 | }; | |
586 | ||
587 | if (inc_opt) | |
588 | ndisc_fill_addr_option(skb, ND_OPT_SOURCE_LL_ADDR, | |
589 | dev->dev_addr); | |
590 | ||
b44b5f4a | 591 | ndisc_send_skb(skb, daddr, saddr); |
1da177e4 LT |
592 | } |
593 | ||
9acd9f3a YH |
594 | void ndisc_send_rs(struct net_device *dev, const struct in6_addr *saddr, |
595 | const struct in6_addr *daddr) | |
1da177e4 | 596 | { |
b44b5f4a | 597 | struct sk_buff *skb; |
1cb3fe51 | 598 | struct rs_msg *msg; |
95c385b4 | 599 | int send_sllao = dev->addr_len; |
1cb3fe51 | 600 | int optlen = 0; |
95c385b4 NH |
601 | |
602 | #ifdef CONFIG_IPV6_OPTIMISTIC_DAD | |
603 | /* | |
604 | * According to section 2.2 of RFC 4429, we must not | |
605 | * send router solicitations with a sllao from | |
606 | * optimistic addresses, but we may send the solicitation | |
607 | * if we don't include the sllao. So here we check | |
608 | * if our address is optimistic, and if so, we | |
bea85195 | 609 | * suppress the inclusion of the sllao. |
95c385b4 NH |
610 | */ |
611 | if (send_sllao) { | |
c346dca1 | 612 | struct inet6_ifaddr *ifp = ipv6_get_ifaddr(dev_net(dev), saddr, |
1cab3da6 | 613 | dev, 1); |
95c385b4 NH |
614 | if (ifp) { |
615 | if (ifp->flags & IFA_F_OPTIMISTIC) { | |
ca043569 | 616 | send_sllao = 0; |
95c385b4 | 617 | } |
ca043569 | 618 | in6_ifa_put(ifp); |
95c385b4 NH |
619 | } else { |
620 | send_sllao = 0; | |
621 | } | |
622 | } | |
623 | #endif | |
1cb3fe51 YH |
624 | if (send_sllao) |
625 | optlen += ndisc_opt_addr_space(dev); | |
626 | ||
627 | skb = ndisc_alloc_skb(dev, sizeof(*msg) + optlen); | |
b44b5f4a YH |
628 | if (!skb) |
629 | return; | |
630 | ||
1cb3fe51 YH |
631 | msg = (struct rs_msg *)skb_put(skb, sizeof(*msg)); |
632 | *msg = (struct rs_msg) { | |
633 | .icmph = { | |
634 | .icmp6_type = NDISC_ROUTER_SOLICITATION, | |
635 | }, | |
636 | }; | |
637 | ||
638 | if (send_sllao) | |
639 | ndisc_fill_addr_option(skb, ND_OPT_SOURCE_LL_ADDR, | |
640 | dev->dev_addr); | |
641 | ||
b44b5f4a | 642 | ndisc_send_skb(skb, daddr, saddr); |
1da177e4 | 643 | } |
1ab1457c | 644 | |
1da177e4 LT |
645 | |
646 | static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb) | |
647 | { | |
648 | /* | |
649 | * "The sender MUST return an ICMP | |
650 | * destination unreachable" | |
651 | */ | |
652 | dst_link_failure(skb); | |
653 | kfree_skb(skb); | |
654 | } | |
655 | ||
656 | /* Called with locked neigh: either read or both */ | |
657 | ||
658 | static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb) | |
659 | { | |
660 | struct in6_addr *saddr = NULL; | |
661 | struct in6_addr mcaddr; | |
662 | struct net_device *dev = neigh->dev; | |
663 | struct in6_addr *target = (struct in6_addr *)&neigh->primary_key; | |
664 | int probes = atomic_read(&neigh->probes); | |
665 | ||
c58da4c6 EK |
666 | if (skb && ipv6_chk_addr_and_flags(dev_net(dev), &ipv6_hdr(skb)->saddr, |
667 | dev, 1, | |
668 | IFA_F_TENTATIVE|IFA_F_OPTIMISTIC)) | |
0660e03f | 669 | saddr = &ipv6_hdr(skb)->saddr; |
e5d08d71 IM |
670 | probes -= NEIGH_VAR(neigh->parms, UCAST_PROBES); |
671 | if (probes < 0) { | |
1da177e4 | 672 | if (!(neigh->nud_state & NUD_VALID)) { |
675418d5 JP |
673 | ND_PRINTK(1, dbg, |
674 | "%s: trying to ucast probe in NUD_INVALID: %pI6\n", | |
675 | __func__, target); | |
1da177e4 LT |
676 | } |
677 | ndisc_send_ns(dev, neigh, target, target, saddr); | |
1f9248e5 | 678 | } else if ((probes -= NEIGH_VAR(neigh->parms, APP_PROBES)) < 0) { |
1da177e4 | 679 | neigh_app_ns(neigh); |
1da177e4 LT |
680 | } else { |
681 | addrconf_addr_solict_mult(target, &mcaddr); | |
682 | ndisc_send_ns(dev, NULL, target, &mcaddr, saddr); | |
683 | } | |
684 | } | |
685 | ||
0736ffc0 YH |
686 | static int pndisc_is_router(const void *pkey, |
687 | struct net_device *dev) | |
fa86d322 PE |
688 | { |
689 | struct pneigh_entry *n; | |
0736ffc0 | 690 | int ret = -1; |
fa86d322 PE |
691 | |
692 | read_lock_bh(&nd_tbl.lock); | |
0736ffc0 YH |
693 | n = __pneigh_lookup(&nd_tbl, dev_net(dev), pkey, dev); |
694 | if (n) | |
695 | ret = !!(n->flags & NTF_ROUTER); | |
fa86d322 PE |
696 | read_unlock_bh(&nd_tbl.lock); |
697 | ||
0736ffc0 | 698 | return ret; |
fa86d322 PE |
699 | } |
700 | ||
1da177e4 LT |
701 | static void ndisc_recv_ns(struct sk_buff *skb) |
702 | { | |
9c70220b | 703 | struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb); |
b71d1d42 ED |
704 | const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; |
705 | const struct in6_addr *daddr = &ipv6_hdr(skb)->daddr; | |
1da177e4 | 706 | u8 *lladdr = NULL; |
29a3cad5 | 707 | u32 ndoptlen = skb_tail_pointer(skb) - (skb_transport_header(skb) + |
27a884dc | 708 | offsetof(struct nd_msg, opt)); |
1da177e4 LT |
709 | struct ndisc_options ndopts; |
710 | struct net_device *dev = skb->dev; | |
711 | struct inet6_ifaddr *ifp; | |
712 | struct inet6_dev *idev = NULL; | |
713 | struct neighbour *neigh; | |
714 | int dad = ipv6_addr_any(saddr); | |
a50feda5 | 715 | bool inc; |
0736ffc0 | 716 | int is_router = -1; |
1da177e4 | 717 | |
115b0aa6 YH |
718 | if (skb->len < sizeof(struct nd_msg)) { |
719 | ND_PRINTK(2, warn, "NS: packet too short\n"); | |
720 | return; | |
721 | } | |
722 | ||
1da177e4 | 723 | if (ipv6_addr_is_multicast(&msg->target)) { |
675418d5 | 724 | ND_PRINTK(2, warn, "NS: multicast target address\n"); |
1da177e4 LT |
725 | return; |
726 | } | |
727 | ||
728 | /* | |
729 | * RFC2461 7.1.1: | |
730 | * DAD has to be destined for solicited node multicast address. | |
731 | */ | |
ca97a644 | 732 | if (dad && !ipv6_addr_is_solict_mult(daddr)) { |
675418d5 | 733 | ND_PRINTK(2, warn, "NS: bad DAD packet (wrong destination)\n"); |
1da177e4 LT |
734 | return; |
735 | } | |
736 | ||
737 | if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) { | |
675418d5 | 738 | ND_PRINTK(2, warn, "NS: invalid ND options\n"); |
1da177e4 LT |
739 | return; |
740 | } | |
741 | ||
742 | if (ndopts.nd_opts_src_lladdr) { | |
743 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, dev); | |
744 | if (!lladdr) { | |
675418d5 JP |
745 | ND_PRINTK(2, warn, |
746 | "NS: invalid link-layer address length\n"); | |
1da177e4 LT |
747 | return; |
748 | } | |
749 | ||
750 | /* RFC2461 7.1.1: | |
1ab1457c YH |
751 | * If the IP source address is the unspecified address, |
752 | * there MUST NOT be source link-layer address option | |
1da177e4 LT |
753 | * in the message. |
754 | */ | |
755 | if (dad) { | |
675418d5 JP |
756 | ND_PRINTK(2, warn, |
757 | "NS: bad DAD packet (link-layer address option)\n"); | |
1da177e4 LT |
758 | return; |
759 | } | |
760 | } | |
761 | ||
762 | inc = ipv6_addr_is_multicast(daddr); | |
763 | ||
c346dca1 | 764 | ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1); |
a18bc695 | 765 | if (ifp) { |
95c385b4 NH |
766 | |
767 | if (ifp->flags & (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC)) { | |
768 | if (dad) { | |
95c385b4 NH |
769 | /* |
770 | * We are colliding with another node | |
771 | * who is doing DAD | |
772 | * so fail our DAD process | |
773 | */ | |
774 | addrconf_dad_failure(ifp); | |
9e3be4b3 | 775 | return; |
95c385b4 NH |
776 | } else { |
777 | /* | |
778 | * This is not a dad solicitation. | |
779 | * If we are an optimistic node, | |
780 | * we should respond. | |
781 | * Otherwise, we should ignore it. | |
782 | */ | |
783 | if (!(ifp->flags & IFA_F_OPTIMISTIC)) | |
1da177e4 | 784 | goto out; |
1da177e4 | 785 | } |
1da177e4 LT |
786 | } |
787 | ||
788 | idev = ifp->idev; | |
789 | } else { | |
53b7997f YH |
790 | struct net *net = dev_net(dev); |
791 | ||
1da177e4 LT |
792 | idev = in6_dev_get(dev); |
793 | if (!idev) { | |
794 | /* XXX: count this drop? */ | |
795 | return; | |
796 | } | |
797 | ||
53b7997f | 798 | if (ipv6_chk_acast_addr(net, dev, &msg->target) || |
1ab1457c | 799 | (idev->cnf.forwarding && |
53b7997f | 800 | (net->ipv6.devconf_all->proxy_ndp || idev->cnf.proxy_ndp) && |
0736ffc0 | 801 | (is_router = pndisc_is_router(&msg->target, dev)) >= 0)) { |
a61bbcf2 | 802 | if (!(NEIGH_CB(skb)->flags & LOCALLY_ENQUEUED) && |
1da177e4 | 803 | skb->pkt_type != PACKET_HOST && |
f2f79cca | 804 | inc && |
1f9248e5 | 805 | NEIGH_VAR(idev->nd_parms, PROXY_DELAY) != 0) { |
1da177e4 LT |
806 | /* |
807 | * for anycast or proxy, | |
1ab1457c YH |
808 | * sender should delay its response |
809 | * by a random time between 0 and | |
1da177e4 LT |
810 | * MAX_ANYCAST_DELAY_TIME seconds. |
811 | * (RFC2461) -- yoshfuji | |
812 | */ | |
813 | struct sk_buff *n = skb_clone(skb, GFP_ATOMIC); | |
814 | if (n) | |
815 | pneigh_enqueue(&nd_tbl, idev->nd_parms, n); | |
816 | goto out; | |
817 | } | |
818 | } else | |
819 | goto out; | |
820 | } | |
821 | ||
0736ffc0 | 822 | if (is_router < 0) |
fb568637 | 823 | is_router = idev->cnf.forwarding; |
62dd9318 | 824 | |
1da177e4 | 825 | if (dad) { |
f3ee4010 | 826 | ndisc_send_na(dev, NULL, &in6addr_linklocal_allnodes, &msg->target, |
fb568637 | 827 | !!is_router, false, (ifp != NULL), true); |
1da177e4 LT |
828 | goto out; |
829 | } | |
830 | ||
831 | if (inc) | |
832 | NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_mcast); | |
833 | else | |
834 | NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_ucast); | |
835 | ||
1ab1457c | 836 | /* |
1da177e4 LT |
837 | * update / create cache entry |
838 | * for the source address | |
839 | */ | |
840 | neigh = __neigh_lookup(&nd_tbl, saddr, dev, | |
841 | !inc || lladdr || !dev->addr_len); | |
842 | if (neigh) | |
1ab1457c | 843 | neigh_update(neigh, lladdr, NUD_STALE, |
1da177e4 LT |
844 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
845 | NEIGH_UPDATE_F_OVERRIDE); | |
3b04ddde | 846 | if (neigh || !dev->header_ops) { |
1da177e4 | 847 | ndisc_send_na(dev, neigh, saddr, &msg->target, |
fb568637 YH |
848 | !!is_router, |
849 | true, (ifp != NULL && inc), inc); | |
1da177e4 LT |
850 | if (neigh) |
851 | neigh_release(neigh); | |
852 | } | |
853 | ||
854 | out: | |
855 | if (ifp) | |
856 | in6_ifa_put(ifp); | |
857 | else | |
858 | in6_dev_put(idev); | |
1da177e4 LT |
859 | } |
860 | ||
861 | static void ndisc_recv_na(struct sk_buff *skb) | |
862 | { | |
9c70220b | 863 | struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb); |
be7a010d | 864 | struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; |
b71d1d42 | 865 | const struct in6_addr *daddr = &ipv6_hdr(skb)->daddr; |
1da177e4 | 866 | u8 *lladdr = NULL; |
29a3cad5 | 867 | u32 ndoptlen = skb_tail_pointer(skb) - (skb_transport_header(skb) + |
27a884dc | 868 | offsetof(struct nd_msg, opt)); |
1da177e4 LT |
869 | struct ndisc_options ndopts; |
870 | struct net_device *dev = skb->dev; | |
871 | struct inet6_ifaddr *ifp; | |
872 | struct neighbour *neigh; | |
873 | ||
874 | if (skb->len < sizeof(struct nd_msg)) { | |
675418d5 | 875 | ND_PRINTK(2, warn, "NA: packet too short\n"); |
1da177e4 LT |
876 | return; |
877 | } | |
878 | ||
879 | if (ipv6_addr_is_multicast(&msg->target)) { | |
675418d5 | 880 | ND_PRINTK(2, warn, "NA: target address is multicast\n"); |
1da177e4 LT |
881 | return; |
882 | } | |
883 | ||
884 | if (ipv6_addr_is_multicast(daddr) && | |
885 | msg->icmph.icmp6_solicited) { | |
675418d5 | 886 | ND_PRINTK(2, warn, "NA: solicited NA is multicasted\n"); |
1da177e4 LT |
887 | return; |
888 | } | |
1ab1457c | 889 | |
1da177e4 | 890 | if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) { |
675418d5 | 891 | ND_PRINTK(2, warn, "NS: invalid ND option\n"); |
1da177e4 LT |
892 | return; |
893 | } | |
894 | if (ndopts.nd_opts_tgt_lladdr) { | |
895 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, dev); | |
896 | if (!lladdr) { | |
675418d5 JP |
897 | ND_PRINTK(2, warn, |
898 | "NA: invalid link-layer address length\n"); | |
1da177e4 LT |
899 | return; |
900 | } | |
901 | } | |
c346dca1 | 902 | ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1); |
a18bc695 | 903 | if (ifp) { |
bd015928 DW |
904 | if (skb->pkt_type != PACKET_LOOPBACK |
905 | && (ifp->flags & IFA_F_TENTATIVE)) { | |
906 | addrconf_dad_failure(ifp); | |
907 | return; | |
1da177e4 LT |
908 | } |
909 | /* What should we make now? The advertisement | |
910 | is invalid, but ndisc specs say nothing | |
911 | about it. It could be misconfiguration, or | |
912 | an smart proxy agent tries to help us :-) | |
24fc7b86 JS |
913 | |
914 | We should not print the error if NA has been | |
915 | received from loopback - it is just our own | |
916 | unsolicited advertisement. | |
1da177e4 | 917 | */ |
24fc7b86 | 918 | if (skb->pkt_type != PACKET_LOOPBACK) |
675418d5 JP |
919 | ND_PRINTK(1, warn, |
920 | "NA: someone advertises our address %pI6 on %s!\n", | |
921 | &ifp->addr, ifp->idev->dev->name); | |
1da177e4 LT |
922 | in6_ifa_put(ifp); |
923 | return; | |
924 | } | |
925 | neigh = neigh_lookup(&nd_tbl, &msg->target, dev); | |
926 | ||
927 | if (neigh) { | |
928 | u8 old_flags = neigh->flags; | |
53b7997f | 929 | struct net *net = dev_net(dev); |
1da177e4 LT |
930 | |
931 | if (neigh->nud_state & NUD_FAILED) | |
932 | goto out; | |
933 | ||
5f3e6e9e VN |
934 | /* |
935 | * Don't update the neighbor cache entry on a proxy NA from | |
936 | * ourselves because either the proxied node is off link or it | |
937 | * has already sent a NA to us. | |
938 | */ | |
939 | if (lladdr && !memcmp(lladdr, dev->dev_addr, dev->addr_len) && | |
53b7997f YH |
940 | net->ipv6.devconf_all->forwarding && net->ipv6.devconf_all->proxy_ndp && |
941 | pneigh_lookup(&nd_tbl, net, &msg->target, dev, 0)) { | |
b20b6d97 | 942 | /* XXX: idev->cnf.proxy_ndp */ |
5f3e6e9e | 943 | goto out; |
fbea49e1 | 944 | } |
5f3e6e9e | 945 | |
1da177e4 LT |
946 | neigh_update(neigh, lladdr, |
947 | msg->icmph.icmp6_solicited ? NUD_REACHABLE : NUD_STALE, | |
948 | NEIGH_UPDATE_F_WEAK_OVERRIDE| | |
949 | (msg->icmph.icmp6_override ? NEIGH_UPDATE_F_OVERRIDE : 0)| | |
950 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
951 | (msg->icmph.icmp6_router ? NEIGH_UPDATE_F_ISROUTER : 0)); | |
952 | ||
953 | if ((old_flags & ~neigh->flags) & NTF_ROUTER) { | |
954 | /* | |
955 | * Change: router to host | |
956 | */ | |
be7a010d | 957 | rt6_clean_tohost(dev_net(dev), saddr); |
1da177e4 LT |
958 | } |
959 | ||
960 | out: | |
961 | neigh_release(neigh); | |
962 | } | |
963 | } | |
964 | ||
965 | static void ndisc_recv_rs(struct sk_buff *skb) | |
966 | { | |
9c70220b | 967 | struct rs_msg *rs_msg = (struct rs_msg *)skb_transport_header(skb); |
1da177e4 LT |
968 | unsigned long ndoptlen = skb->len - sizeof(*rs_msg); |
969 | struct neighbour *neigh; | |
970 | struct inet6_dev *idev; | |
b71d1d42 | 971 | const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; |
1da177e4 LT |
972 | struct ndisc_options ndopts; |
973 | u8 *lladdr = NULL; | |
974 | ||
975 | if (skb->len < sizeof(*rs_msg)) | |
976 | return; | |
977 | ||
cfdf7647 | 978 | idev = __in6_dev_get(skb->dev); |
1da177e4 | 979 | if (!idev) { |
675418d5 | 980 | ND_PRINTK(1, err, "RS: can't find in6 device\n"); |
1da177e4 LT |
981 | return; |
982 | } | |
983 | ||
984 | /* Don't accept RS if we're not in router mode */ | |
985 | if (!idev->cnf.forwarding) | |
986 | goto out; | |
987 | ||
988 | /* | |
989 | * Don't update NCE if src = ::; | |
990 | * this implies that the source node has no ip address assigned yet. | |
991 | */ | |
992 | if (ipv6_addr_any(saddr)) | |
993 | goto out; | |
994 | ||
995 | /* Parse ND options */ | |
996 | if (!ndisc_parse_options(rs_msg->opt, ndoptlen, &ndopts)) { | |
675418d5 | 997 | ND_PRINTK(2, notice, "NS: invalid ND option, ignored\n"); |
1da177e4 LT |
998 | goto out; |
999 | } | |
1000 | ||
1001 | if (ndopts.nd_opts_src_lladdr) { | |
1002 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, | |
1003 | skb->dev); | |
1004 | if (!lladdr) | |
1005 | goto out; | |
1006 | } | |
1007 | ||
1008 | neigh = __neigh_lookup(&nd_tbl, saddr, skb->dev, 1); | |
1009 | if (neigh) { | |
1010 | neigh_update(neigh, lladdr, NUD_STALE, | |
1011 | NEIGH_UPDATE_F_WEAK_OVERRIDE| | |
1012 | NEIGH_UPDATE_F_OVERRIDE| | |
1013 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER); | |
1014 | neigh_release(neigh); | |
1015 | } | |
1016 | out: | |
cfdf7647 | 1017 | return; |
1da177e4 LT |
1018 | } |
1019 | ||
31910575 PY |
1020 | static void ndisc_ra_useropt(struct sk_buff *ra, struct nd_opt_hdr *opt) |
1021 | { | |
1022 | struct icmp6hdr *icmp6h = (struct icmp6hdr *)skb_transport_header(ra); | |
1023 | struct sk_buff *skb; | |
1024 | struct nlmsghdr *nlh; | |
1025 | struct nduseroptmsg *ndmsg; | |
c346dca1 | 1026 | struct net *net = dev_net(ra->dev); |
31910575 PY |
1027 | int err; |
1028 | int base_size = NLMSG_ALIGN(sizeof(struct nduseroptmsg) | |
1029 | + (opt->nd_opt_len << 3)); | |
1030 | size_t msg_size = base_size + nla_total_size(sizeof(struct in6_addr)); | |
1031 | ||
1032 | skb = nlmsg_new(msg_size, GFP_ATOMIC); | |
63159f29 | 1033 | if (!skb) { |
31910575 PY |
1034 | err = -ENOBUFS; |
1035 | goto errout; | |
1036 | } | |
1037 | ||
1038 | nlh = nlmsg_put(skb, 0, 0, RTM_NEWNDUSEROPT, base_size, 0); | |
63159f29 | 1039 | if (!nlh) { |
31910575 PY |
1040 | goto nla_put_failure; |
1041 | } | |
1042 | ||
1043 | ndmsg = nlmsg_data(nlh); | |
1044 | ndmsg->nduseropt_family = AF_INET6; | |
dbb2ed24 | 1045 | ndmsg->nduseropt_ifindex = ra->dev->ifindex; |
31910575 PY |
1046 | ndmsg->nduseropt_icmp_type = icmp6h->icmp6_type; |
1047 | ndmsg->nduseropt_icmp_code = icmp6h->icmp6_code; | |
1048 | ndmsg->nduseropt_opts_len = opt->nd_opt_len << 3; | |
1049 | ||
1050 | memcpy(ndmsg + 1, opt, opt->nd_opt_len << 3); | |
1051 | ||
c78679e8 DM |
1052 | if (nla_put(skb, NDUSEROPT_SRCADDR, sizeof(struct in6_addr), |
1053 | &ipv6_hdr(ra)->saddr)) | |
1054 | goto nla_put_failure; | |
31910575 PY |
1055 | nlmsg_end(skb, nlh); |
1056 | ||
1ce85fe4 | 1057 | rtnl_notify(skb, net, 0, RTNLGRP_ND_USEROPT, NULL, GFP_ATOMIC); |
31910575 PY |
1058 | return; |
1059 | ||
1060 | nla_put_failure: | |
1061 | nlmsg_free(skb); | |
1062 | err = -EMSGSIZE; | |
1063 | errout: | |
a18bc695 | 1064 | rtnl_set_sk_err(net, RTNLGRP_ND_USEROPT, err); |
31910575 PY |
1065 | } |
1066 | ||
1da177e4 LT |
1067 | static void ndisc_router_discovery(struct sk_buff *skb) |
1068 | { | |
9c70220b | 1069 | struct ra_msg *ra_msg = (struct ra_msg *)skb_transport_header(skb); |
1da177e4 LT |
1070 | struct neighbour *neigh = NULL; |
1071 | struct inet6_dev *in6_dev; | |
65f5c7c1 | 1072 | struct rt6_info *rt = NULL; |
1da177e4 LT |
1073 | int lifetime; |
1074 | struct ndisc_options ndopts; | |
1075 | int optlen; | |
ebacaaa0 | 1076 | unsigned int pref = 0; |
1da177e4 | 1077 | |
67ba4152 | 1078 | __u8 *opt = (__u8 *)(ra_msg + 1); |
1da177e4 | 1079 | |
29a3cad5 SH |
1080 | optlen = (skb_tail_pointer(skb) - skb_transport_header(skb)) - |
1081 | sizeof(struct ra_msg); | |
1da177e4 | 1082 | |
f2a762d8 BG |
1083 | ND_PRINTK(2, info, |
1084 | "RA: %s, dev: %s\n", | |
1085 | __func__, skb->dev->name); | |
0660e03f | 1086 | if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) { |
675418d5 | 1087 | ND_PRINTK(2, warn, "RA: source address is not link-local\n"); |
1da177e4 LT |
1088 | return; |
1089 | } | |
1090 | if (optlen < 0) { | |
675418d5 | 1091 | ND_PRINTK(2, warn, "RA: packet too short\n"); |
1da177e4 LT |
1092 | return; |
1093 | } | |
1094 | ||
de357cc0 | 1095 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 | 1096 | if (skb->ndisc_nodetype == NDISC_NODETYPE_HOST) { |
675418d5 | 1097 | ND_PRINTK(2, warn, "RA: from host or unauthorized router\n"); |
fadf6bf0 TF |
1098 | return; |
1099 | } | |
de357cc0 | 1100 | #endif |
fadf6bf0 | 1101 | |
1da177e4 LT |
1102 | /* |
1103 | * set the RA_RECV flag in the interface | |
1104 | */ | |
1105 | ||
cfdf7647 | 1106 | in6_dev = __in6_dev_get(skb->dev); |
63159f29 | 1107 | if (!in6_dev) { |
675418d5 JP |
1108 | ND_PRINTK(0, err, "RA: can't find inet6 device for %s\n", |
1109 | skb->dev->name); | |
1da177e4 LT |
1110 | return; |
1111 | } | |
1da177e4 LT |
1112 | |
1113 | if (!ndisc_parse_options(opt, optlen, &ndopts)) { | |
675418d5 | 1114 | ND_PRINTK(2, warn, "RA: invalid ND options\n"); |
1da177e4 LT |
1115 | return; |
1116 | } | |
1117 | ||
f2a762d8 BG |
1118 | if (!ipv6_accept_ra(in6_dev)) { |
1119 | ND_PRINTK(2, info, | |
1120 | "RA: %s, did not accept ra for dev: %s\n", | |
1121 | __func__, skb->dev->name); | |
31ce8c71 | 1122 | goto skip_linkparms; |
f2a762d8 | 1123 | } |
31ce8c71 | 1124 | |
de357cc0 | 1125 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 | 1126 | /* skip link-specific parameters from interior routers */ |
f2a762d8 BG |
1127 | if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT) { |
1128 | ND_PRINTK(2, info, | |
1129 | "RA: %s, nodetype is NODEFAULT, dev: %s\n", | |
1130 | __func__, skb->dev->name); | |
fadf6bf0 | 1131 | goto skip_linkparms; |
f2a762d8 | 1132 | } |
de357cc0 | 1133 | #endif |
fadf6bf0 | 1134 | |
1da177e4 LT |
1135 | if (in6_dev->if_flags & IF_RS_SENT) { |
1136 | /* | |
1137 | * flag that an RA was received after an RS was sent | |
1138 | * out on this interface. | |
1139 | */ | |
1140 | in6_dev->if_flags |= IF_RA_RCVD; | |
1141 | } | |
1142 | ||
1143 | /* | |
1144 | * Remember the managed/otherconf flags from most recently | |
1145 | * received RA message (RFC 2462) -- yoshfuji | |
1146 | */ | |
1147 | in6_dev->if_flags = (in6_dev->if_flags & ~(IF_RA_MANAGED | | |
1148 | IF_RA_OTHERCONF)) | | |
1149 | (ra_msg->icmph.icmp6_addrconf_managed ? | |
1150 | IF_RA_MANAGED : 0) | | |
1151 | (ra_msg->icmph.icmp6_addrconf_other ? | |
1152 | IF_RA_OTHERCONF : 0); | |
1153 | ||
f2a762d8 BG |
1154 | if (!in6_dev->cnf.accept_ra_defrtr) { |
1155 | ND_PRINTK(2, info, | |
1156 | "RA: %s, defrtr is false for dev: %s\n", | |
1157 | __func__, skb->dev->name); | |
65f5c7c1 | 1158 | goto skip_defrtr; |
f2a762d8 | 1159 | } |
65f5c7c1 | 1160 | |
d9333196 BG |
1161 | /* Do not accept RA with source-addr found on local machine unless |
1162 | * accept_ra_from_local is set to true. | |
1163 | */ | |
b6428817 LR |
1164 | if (!in6_dev->cnf.accept_ra_from_local && |
1165 | ipv6_chk_addr(dev_net(in6_dev->dev), &ipv6_hdr(skb)->saddr, | |
1166 | NULL, 0)) { | |
f2a762d8 | 1167 | ND_PRINTK(2, info, |
d9333196 BG |
1168 | "RA from local address detected on dev: %s: default router ignored\n", |
1169 | skb->dev->name); | |
9f56220f | 1170 | goto skip_defrtr; |
f2a762d8 | 1171 | } |
9f56220f | 1172 | |
1da177e4 LT |
1173 | lifetime = ntohs(ra_msg->icmph.icmp6_rt_lifetime); |
1174 | ||
ebacaaa0 YH |
1175 | #ifdef CONFIG_IPV6_ROUTER_PREF |
1176 | pref = ra_msg->icmph.icmp6_router_pref; | |
1177 | /* 10b is handled as if it were 00b (medium) */ | |
930d6ff2 | 1178 | if (pref == ICMPV6_ROUTER_PREF_INVALID || |
6d5b78cd | 1179 | !in6_dev->cnf.accept_ra_rtr_pref) |
ebacaaa0 YH |
1180 | pref = ICMPV6_ROUTER_PREF_MEDIUM; |
1181 | #endif | |
1182 | ||
0660e03f | 1183 | rt = rt6_get_dflt_router(&ipv6_hdr(skb)->saddr, skb->dev); |
1da177e4 | 1184 | |
eb857186 DM |
1185 | if (rt) { |
1186 | neigh = dst_neigh_lookup(&rt->dst, &ipv6_hdr(skb)->saddr); | |
1187 | if (!neigh) { | |
675418d5 JP |
1188 | ND_PRINTK(0, err, |
1189 | "RA: %s got default router without neighbour\n", | |
1190 | __func__); | |
94e187c0 | 1191 | ip6_rt_put(rt); |
eb857186 DM |
1192 | return; |
1193 | } | |
1194 | } | |
1da177e4 | 1195 | if (rt && lifetime == 0) { |
e0a1ad73 | 1196 | ip6_del_rt(rt); |
1da177e4 LT |
1197 | rt = NULL; |
1198 | } | |
1199 | ||
f2a762d8 BG |
1200 | ND_PRINTK(3, info, "RA: rt: %p lifetime: %d, for dev: %s\n", |
1201 | rt, lifetime, skb->dev->name); | |
63159f29 | 1202 | if (!rt && lifetime) { |
f2a762d8 | 1203 | ND_PRINTK(3, info, "RA: adding default router\n"); |
1da177e4 | 1204 | |
0660e03f | 1205 | rt = rt6_add_dflt_router(&ipv6_hdr(skb)->saddr, skb->dev, pref); |
63159f29 | 1206 | if (!rt) { |
675418d5 JP |
1207 | ND_PRINTK(0, err, |
1208 | "RA: %s failed to add default route\n", | |
1209 | __func__); | |
1da177e4 LT |
1210 | return; |
1211 | } | |
1212 | ||
eb857186 | 1213 | neigh = dst_neigh_lookup(&rt->dst, &ipv6_hdr(skb)->saddr); |
63159f29 | 1214 | if (!neigh) { |
675418d5 JP |
1215 | ND_PRINTK(0, err, |
1216 | "RA: %s got default router without neighbour\n", | |
1217 | __func__); | |
94e187c0 | 1218 | ip6_rt_put(rt); |
1da177e4 LT |
1219 | return; |
1220 | } | |
1221 | neigh->flags |= NTF_ROUTER; | |
ebacaaa0 | 1222 | } else if (rt) { |
22441cfa | 1223 | rt->rt6i_flags = (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); |
1da177e4 LT |
1224 | } |
1225 | ||
1226 | if (rt) | |
1716a961 | 1227 | rt6_set_expires(rt, jiffies + (HZ * lifetime)); |
1da177e4 LT |
1228 | if (ra_msg->icmph.icmp6_hop_limit) { |
1229 | in6_dev->cnf.hop_limit = ra_msg->icmph.icmp6_hop_limit; | |
1230 | if (rt) | |
defb3519 DM |
1231 | dst_metric_set(&rt->dst, RTAX_HOPLIMIT, |
1232 | ra_msg->icmph.icmp6_hop_limit); | |
1da177e4 LT |
1233 | } |
1234 | ||
65f5c7c1 YH |
1235 | skip_defrtr: |
1236 | ||
1da177e4 LT |
1237 | /* |
1238 | * Update Reachable Time and Retrans Timer | |
1239 | */ | |
1240 | ||
1241 | if (in6_dev->nd_parms) { | |
1242 | unsigned long rtime = ntohl(ra_msg->retrans_timer); | |
1243 | ||
1244 | if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/HZ) { | |
1245 | rtime = (rtime*HZ)/1000; | |
1246 | if (rtime < HZ/10) | |
1247 | rtime = HZ/10; | |
1f9248e5 | 1248 | NEIGH_VAR_SET(in6_dev->nd_parms, RETRANS_TIME, rtime); |
1da177e4 LT |
1249 | in6_dev->tstamp = jiffies; |
1250 | inet6_ifinfo_notify(RTM_NEWLINK, in6_dev); | |
1251 | } | |
1252 | ||
1253 | rtime = ntohl(ra_msg->reachable_time); | |
1254 | if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/(3*HZ)) { | |
1255 | rtime = (rtime*HZ)/1000; | |
1256 | ||
1257 | if (rtime < HZ/10) | |
1258 | rtime = HZ/10; | |
1259 | ||
1f9248e5 JP |
1260 | if (rtime != NEIGH_VAR(in6_dev->nd_parms, BASE_REACHABLE_TIME)) { |
1261 | NEIGH_VAR_SET(in6_dev->nd_parms, | |
1262 | BASE_REACHABLE_TIME, rtime); | |
1263 | NEIGH_VAR_SET(in6_dev->nd_parms, | |
1264 | GC_STALETIME, 3 * rtime); | |
1da177e4 LT |
1265 | in6_dev->nd_parms->reachable_time = neigh_rand_reach_time(rtime); |
1266 | in6_dev->tstamp = jiffies; | |
1267 | inet6_ifinfo_notify(RTM_NEWLINK, in6_dev); | |
1268 | } | |
1269 | } | |
1270 | } | |
1271 | ||
fadf6bf0 TF |
1272 | skip_linkparms: |
1273 | ||
1da177e4 LT |
1274 | /* |
1275 | * Process options. | |
1276 | */ | |
1277 | ||
1278 | if (!neigh) | |
0660e03f | 1279 | neigh = __neigh_lookup(&nd_tbl, &ipv6_hdr(skb)->saddr, |
1da177e4 LT |
1280 | skb->dev, 1); |
1281 | if (neigh) { | |
1282 | u8 *lladdr = NULL; | |
1283 | if (ndopts.nd_opts_src_lladdr) { | |
1284 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, | |
1285 | skb->dev); | |
1286 | if (!lladdr) { | |
675418d5 JP |
1287 | ND_PRINTK(2, warn, |
1288 | "RA: invalid link-layer address length\n"); | |
1da177e4 LT |
1289 | goto out; |
1290 | } | |
1291 | } | |
1292 | neigh_update(neigh, lladdr, NUD_STALE, | |
1293 | NEIGH_UPDATE_F_WEAK_OVERRIDE| | |
1294 | NEIGH_UPDATE_F_OVERRIDE| | |
1295 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
1296 | NEIGH_UPDATE_F_ISROUTER); | |
1297 | } | |
1298 | ||
f2a762d8 BG |
1299 | if (!ipv6_accept_ra(in6_dev)) { |
1300 | ND_PRINTK(2, info, | |
1301 | "RA: %s, accept_ra is false for dev: %s\n", | |
1302 | __func__, skb->dev->name); | |
31ce8c71 | 1303 | goto out; |
f2a762d8 | 1304 | } |
31ce8c71 | 1305 | |
70ceb4f5 | 1306 | #ifdef CONFIG_IPV6_ROUTE_INFO |
b6428817 LR |
1307 | if (!in6_dev->cnf.accept_ra_from_local && |
1308 | ipv6_chk_addr(dev_net(in6_dev->dev), &ipv6_hdr(skb)->saddr, | |
1309 | NULL, 0)) { | |
f2a762d8 | 1310 | ND_PRINTK(2, info, |
d9333196 BG |
1311 | "RA from local address detected on dev: %s: router info ignored.\n", |
1312 | skb->dev->name); | |
9f56220f | 1313 | goto skip_routeinfo; |
f2a762d8 | 1314 | } |
9f56220f | 1315 | |
09c884d4 | 1316 | if (in6_dev->cnf.accept_ra_rtr_pref && ndopts.nd_opts_ri) { |
70ceb4f5 YH |
1317 | struct nd_opt_hdr *p; |
1318 | for (p = ndopts.nd_opts_ri; | |
1319 | p; | |
1320 | p = ndisc_next_option(p, ndopts.nd_opts_ri_end)) { | |
6294e000 YH |
1321 | struct route_info *ri = (struct route_info *)p; |
1322 | #ifdef CONFIG_IPV6_NDISC_NODETYPE | |
1323 | if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT && | |
1324 | ri->prefix_len == 0) | |
1325 | continue; | |
1326 | #endif | |
30e56918 DJ |
1327 | if (ri->prefix_len == 0 && |
1328 | !in6_dev->cnf.accept_ra_defrtr) | |
1329 | continue; | |
6294e000 | 1330 | if (ri->prefix_len > in6_dev->cnf.accept_ra_rt_info_max_plen) |
09c884d4 | 1331 | continue; |
67ba4152 | 1332 | rt6_route_rcv(skb->dev, (u8 *)p, (p->nd_opt_len) << 3, |
0660e03f | 1333 | &ipv6_hdr(skb)->saddr); |
70ceb4f5 YH |
1334 | } |
1335 | } | |
9f56220f AH |
1336 | |
1337 | skip_routeinfo: | |
70ceb4f5 YH |
1338 | #endif |
1339 | ||
de357cc0 | 1340 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 | 1341 | /* skip link-specific ndopts from interior routers */ |
f2a762d8 BG |
1342 | if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT) { |
1343 | ND_PRINTK(2, info, | |
1344 | "RA: %s, nodetype is NODEFAULT (interior routes), dev: %s\n", | |
1345 | __func__, skb->dev->name); | |
fadf6bf0 | 1346 | goto out; |
f2a762d8 | 1347 | } |
de357cc0 | 1348 | #endif |
fadf6bf0 | 1349 | |
c4fd30eb | 1350 | if (in6_dev->cnf.accept_ra_pinfo && ndopts.nd_opts_pi) { |
1da177e4 LT |
1351 | struct nd_opt_hdr *p; |
1352 | for (p = ndopts.nd_opts_pi; | |
1353 | p; | |
1354 | p = ndisc_next_option(p, ndopts.nd_opts_pi_end)) { | |
e6bff995 NH |
1355 | addrconf_prefix_rcv(skb->dev, (u8 *)p, |
1356 | (p->nd_opt_len) << 3, | |
1357 | ndopts.nd_opts_src_lladdr != NULL); | |
1da177e4 LT |
1358 | } |
1359 | } | |
1360 | ||
c2943f14 | 1361 | if (ndopts.nd_opts_mtu && in6_dev->cnf.accept_ra_mtu) { |
e69a4adc | 1362 | __be32 n; |
1da177e4 LT |
1363 | u32 mtu; |
1364 | ||
67ba4152 | 1365 | memcpy(&n, ((u8 *)(ndopts.nd_opts_mtu+1))+2, sizeof(mtu)); |
e69a4adc | 1366 | mtu = ntohl(n); |
1da177e4 LT |
1367 | |
1368 | if (mtu < IPV6_MIN_MTU || mtu > skb->dev->mtu) { | |
675418d5 | 1369 | ND_PRINTK(2, warn, "RA: invalid mtu: %d\n", mtu); |
1da177e4 LT |
1370 | } else if (in6_dev->cnf.mtu6 != mtu) { |
1371 | in6_dev->cnf.mtu6 = mtu; | |
1372 | ||
1373 | if (rt) | |
defb3519 | 1374 | dst_metric_set(&rt->dst, RTAX_MTU, mtu); |
1da177e4 LT |
1375 | |
1376 | rt6_mtu_change(skb->dev, mtu); | |
1377 | } | |
1378 | } | |
1ab1457c | 1379 | |
31910575 | 1380 | if (ndopts.nd_useropts) { |
61cf46ad YH |
1381 | struct nd_opt_hdr *p; |
1382 | for (p = ndopts.nd_useropts; | |
1383 | p; | |
1384 | p = ndisc_next_useropt(p, ndopts.nd_useropts_end)) { | |
1385 | ndisc_ra_useropt(skb, p); | |
31910575 PY |
1386 | } |
1387 | } | |
1388 | ||
1da177e4 | 1389 | if (ndopts.nd_opts_tgt_lladdr || ndopts.nd_opts_rh) { |
675418d5 | 1390 | ND_PRINTK(2, warn, "RA: invalid RA options\n"); |
1da177e4 LT |
1391 | } |
1392 | out: | |
94e187c0 | 1393 | ip6_rt_put(rt); |
eb857186 | 1394 | if (neigh) |
1da177e4 | 1395 | neigh_release(neigh); |
1da177e4 LT |
1396 | } |
1397 | ||
1398 | static void ndisc_redirect_rcv(struct sk_buff *skb) | |
1399 | { | |
093d04d4 DJ |
1400 | u8 *hdr; |
1401 | struct ndisc_options ndopts; | |
1402 | struct rd_msg *msg = (struct rd_msg *)skb_transport_header(skb); | |
29a3cad5 | 1403 | u32 ndoptlen = skb_tail_pointer(skb) - (skb_transport_header(skb) + |
093d04d4 DJ |
1404 | offsetof(struct rd_msg, opt)); |
1405 | ||
de357cc0 | 1406 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 TF |
1407 | switch (skb->ndisc_nodetype) { |
1408 | case NDISC_NODETYPE_HOST: | |
1409 | case NDISC_NODETYPE_NODEFAULT: | |
675418d5 JP |
1410 | ND_PRINTK(2, warn, |
1411 | "Redirect: from host or unauthorized router\n"); | |
fadf6bf0 TF |
1412 | return; |
1413 | } | |
de357cc0 | 1414 | #endif |
fadf6bf0 | 1415 | |
0660e03f | 1416 | if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) { |
675418d5 JP |
1417 | ND_PRINTK(2, warn, |
1418 | "Redirect: source address is not link-local\n"); | |
1da177e4 LT |
1419 | return; |
1420 | } | |
1421 | ||
093d04d4 DJ |
1422 | if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) |
1423 | return; | |
1424 | ||
c92a59ec | 1425 | if (!ndopts.nd_opts_rh) { |
b55b76b2 DJ |
1426 | ip6_redirect_no_header(skb, dev_net(skb->dev), |
1427 | skb->dev->ifindex, 0); | |
093d04d4 | 1428 | return; |
c92a59ec | 1429 | } |
093d04d4 DJ |
1430 | |
1431 | hdr = (u8 *)ndopts.nd_opts_rh; | |
1432 | hdr += 8; | |
1433 | if (!pskb_pull(skb, hdr - skb_transport_header(skb))) | |
1434 | return; | |
1435 | ||
b94f1c09 | 1436 | icmpv6_notify(skb, NDISC_REDIRECT, 0, 0); |
1da177e4 LT |
1437 | } |
1438 | ||
5f5a0115 YH |
1439 | static void ndisc_fill_redirect_hdr_option(struct sk_buff *skb, |
1440 | struct sk_buff *orig_skb, | |
1441 | int rd_len) | |
9c86dafe | 1442 | { |
5f5a0115 YH |
1443 | u8 *opt = skb_put(skb, rd_len); |
1444 | ||
9c86dafe YH |
1445 | memset(opt, 0, 8); |
1446 | *(opt++) = ND_OPT_REDIRECT_HDR; | |
1447 | *(opt++) = (rd_len >> 3); | |
1448 | opt += 6; | |
1449 | ||
1450 | memcpy(opt, ipv6_hdr(orig_skb), rd_len - 8); | |
9c86dafe YH |
1451 | } |
1452 | ||
4991969a | 1453 | void ndisc_send_redirect(struct sk_buff *skb, const struct in6_addr *target) |
1da177e4 | 1454 | { |
1762f7e8 | 1455 | struct net_device *dev = skb->dev; |
c346dca1 | 1456 | struct net *net = dev_net(dev); |
1762f7e8 | 1457 | struct sock *sk = net->ipv6.ndisc_sk; |
2ce13576 | 1458 | int optlen = 0; |
fbfe95a4 | 1459 | struct inet_peer *peer; |
1da177e4 | 1460 | struct sk_buff *buff; |
71bcdba0 | 1461 | struct rd_msg *msg; |
1da177e4 | 1462 | struct in6_addr saddr_buf; |
1da177e4 LT |
1463 | struct rt6_info *rt; |
1464 | struct dst_entry *dst; | |
4c9483b2 | 1465 | struct flowi6 fl6; |
1da177e4 | 1466 | int rd_len; |
1da177e4 | 1467 | u8 ha_buf[MAX_ADDR_LEN], *ha = NULL; |
1d861aa4 | 1468 | bool ret; |
1da177e4 | 1469 | |
95c385b4 | 1470 | if (ipv6_get_lladdr(dev, &saddr_buf, IFA_F_TENTATIVE)) { |
675418d5 JP |
1471 | ND_PRINTK(2, warn, "Redirect: no link-local address on %s\n", |
1472 | dev->name); | |
1ab1457c YH |
1473 | return; |
1474 | } | |
1da177e4 | 1475 | |
0660e03f | 1476 | if (!ipv6_addr_equal(&ipv6_hdr(skb)->daddr, target) && |
bf0b48df | 1477 | ipv6_addr_type(target) != (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) { |
675418d5 JP |
1478 | ND_PRINTK(2, warn, |
1479 | "Redirect: target address is not link-local unicast\n"); | |
29556526 LY |
1480 | return; |
1481 | } | |
1482 | ||
4c9483b2 | 1483 | icmpv6_flow_init(sk, &fl6, NDISC_REDIRECT, |
95e41e93 | 1484 | &saddr_buf, &ipv6_hdr(skb)->saddr, dev->ifindex); |
1da177e4 | 1485 | |
4c9483b2 | 1486 | dst = ip6_route_output(net, NULL, &fl6); |
5095d64d RL |
1487 | if (dst->error) { |
1488 | dst_release(dst); | |
1da177e4 | 1489 | return; |
5095d64d | 1490 | } |
4c9483b2 | 1491 | dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), NULL, 0); |
452edd59 | 1492 | if (IS_ERR(dst)) |
1da177e4 | 1493 | return; |
1da177e4 LT |
1494 | |
1495 | rt = (struct rt6_info *) dst; | |
1496 | ||
1497 | if (rt->rt6i_flags & RTF_GATEWAY) { | |
675418d5 JP |
1498 | ND_PRINTK(2, warn, |
1499 | "Redirect: destination is not a neighbour\n"); | |
d73f0801 | 1500 | goto release; |
1da177e4 | 1501 | } |
1d861aa4 DM |
1502 | peer = inet_getpeer_v6(net->ipv6.peers, &rt->rt6i_dst.addr, 1); |
1503 | ret = inet_peer_xrlim_allow(peer, 1*HZ); | |
1504 | if (peer) | |
1505 | inet_putpeer(peer); | |
1506 | if (!ret) | |
d73f0801 | 1507 | goto release; |
1da177e4 LT |
1508 | |
1509 | if (dev->addr_len) { | |
4991969a DM |
1510 | struct neighbour *neigh = dst_neigh_lookup(skb_dst(skb), target); |
1511 | if (!neigh) { | |
675418d5 JP |
1512 | ND_PRINTK(2, warn, |
1513 | "Redirect: no neigh for target address\n"); | |
4991969a DM |
1514 | goto release; |
1515 | } | |
1516 | ||
1da177e4 LT |
1517 | read_lock_bh(&neigh->lock); |
1518 | if (neigh->nud_state & NUD_VALID) { | |
1519 | memcpy(ha_buf, neigh->ha, dev->addr_len); | |
1520 | read_unlock_bh(&neigh->lock); | |
1521 | ha = ha_buf; | |
2ce13576 | 1522 | optlen += ndisc_opt_addr_space(dev); |
1da177e4 LT |
1523 | } else |
1524 | read_unlock_bh(&neigh->lock); | |
4991969a DM |
1525 | |
1526 | neigh_release(neigh); | |
1da177e4 LT |
1527 | } |
1528 | ||
1529 | rd_len = min_t(unsigned int, | |
2ce13576 YH |
1530 | IPV6_MIN_MTU - sizeof(struct ipv6hdr) - sizeof(*msg) - optlen, |
1531 | skb->len + 8); | |
1da177e4 | 1532 | rd_len &= ~0x7; |
2ce13576 | 1533 | optlen += rd_len; |
1da177e4 | 1534 | |
2ce13576 | 1535 | buff = ndisc_alloc_skb(dev, sizeof(*msg) + optlen); |
de09334b | 1536 | if (!buff) |
d73f0801 | 1537 | goto release; |
1da177e4 | 1538 | |
4d5c152e YH |
1539 | msg = (struct rd_msg *)skb_put(buff, sizeof(*msg)); |
1540 | *msg = (struct rd_msg) { | |
1541 | .icmph = { | |
1542 | .icmp6_type = NDISC_REDIRECT, | |
1543 | }, | |
1544 | .target = *target, | |
1545 | .dest = ipv6_hdr(skb)->daddr, | |
1546 | }; | |
1da177e4 | 1547 | |
1da177e4 LT |
1548 | /* |
1549 | * include target_address option | |
1550 | */ | |
1551 | ||
1552 | if (ha) | |
33be081a | 1553 | ndisc_fill_addr_option(buff, ND_OPT_TARGET_LL_ADDR, ha); |
1da177e4 LT |
1554 | |
1555 | /* | |
1556 | * build redirect option and copy skb over to the new packet. | |
1557 | */ | |
1558 | ||
9c86dafe | 1559 | if (rd_len) |
5f5a0115 | 1560 | ndisc_fill_redirect_hdr_option(buff, skb, rd_len); |
1da177e4 | 1561 | |
adf30907 | 1562 | skb_dst_set(buff, dst); |
f4de84c6 | 1563 | ndisc_send_skb(buff, &ipv6_hdr(skb)->saddr, &saddr_buf); |
d73f0801 IJ |
1564 | return; |
1565 | ||
1566 | release: | |
1567 | dst_release(dst); | |
1da177e4 LT |
1568 | } |
1569 | ||
1570 | static void pndisc_redo(struct sk_buff *skb) | |
1571 | { | |
140e26fc | 1572 | ndisc_recv_ns(skb); |
1da177e4 LT |
1573 | kfree_skb(skb); |
1574 | } | |
1575 | ||
b800c3b9 HFS |
1576 | static bool ndisc_suppress_frag_ndisc(struct sk_buff *skb) |
1577 | { | |
1578 | struct inet6_dev *idev = __in6_dev_get(skb->dev); | |
1579 | ||
1580 | if (!idev) | |
1581 | return true; | |
1582 | if (IP6CB(skb)->flags & IP6SKB_FRAGMENTED && | |
1583 | idev->cnf.suppress_frag_ndisc) { | |
1584 | net_warn_ratelimited("Received fragmented ndisc packet. Carefully consider disabling suppress_frag_ndisc.\n"); | |
1585 | return true; | |
1586 | } | |
1587 | return false; | |
1588 | } | |
1589 | ||
1da177e4 LT |
1590 | int ndisc_rcv(struct sk_buff *skb) |
1591 | { | |
1592 | struct nd_msg *msg; | |
1593 | ||
b800c3b9 HFS |
1594 | if (ndisc_suppress_frag_ndisc(skb)) |
1595 | return 0; | |
1596 | ||
6bce6b4e | 1597 | if (skb_linearize(skb)) |
1da177e4 LT |
1598 | return 0; |
1599 | ||
9c70220b | 1600 | msg = (struct nd_msg *)skb_transport_header(skb); |
1da177e4 | 1601 | |
9c70220b | 1602 | __skb_push(skb, skb->data - skb_transport_header(skb)); |
1da177e4 | 1603 | |
0660e03f | 1604 | if (ipv6_hdr(skb)->hop_limit != 255) { |
675418d5 JP |
1605 | ND_PRINTK(2, warn, "NDISC: invalid hop-limit: %d\n", |
1606 | ipv6_hdr(skb)->hop_limit); | |
1da177e4 LT |
1607 | return 0; |
1608 | } | |
1609 | ||
1610 | if (msg->icmph.icmp6_code != 0) { | |
675418d5 JP |
1611 | ND_PRINTK(2, warn, "NDISC: invalid ICMPv6 code: %d\n", |
1612 | msg->icmph.icmp6_code); | |
1da177e4 LT |
1613 | return 0; |
1614 | } | |
1615 | ||
a61bbcf2 PM |
1616 | memset(NEIGH_CB(skb), 0, sizeof(struct neighbour_cb)); |
1617 | ||
1da177e4 LT |
1618 | switch (msg->icmph.icmp6_type) { |
1619 | case NDISC_NEIGHBOUR_SOLICITATION: | |
1620 | ndisc_recv_ns(skb); | |
1621 | break; | |
1622 | ||
1623 | case NDISC_NEIGHBOUR_ADVERTISEMENT: | |
1624 | ndisc_recv_na(skb); | |
1625 | break; | |
1626 | ||
1627 | case NDISC_ROUTER_SOLICITATION: | |
1628 | ndisc_recv_rs(skb); | |
1629 | break; | |
1630 | ||
1631 | case NDISC_ROUTER_ADVERTISEMENT: | |
1632 | ndisc_router_discovery(skb); | |
1633 | break; | |
1634 | ||
1635 | case NDISC_REDIRECT: | |
1636 | ndisc_redirect_rcv(skb); | |
1637 | break; | |
3ff50b79 | 1638 | } |
1da177e4 LT |
1639 | |
1640 | return 0; | |
1641 | } | |
1642 | ||
1643 | static int ndisc_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1644 | { | |
351638e7 | 1645 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
c346dca1 | 1646 | struct net *net = dev_net(dev); |
5cb04436 | 1647 | struct inet6_dev *idev; |
1da177e4 LT |
1648 | |
1649 | switch (event) { | |
1650 | case NETDEV_CHANGEADDR: | |
1651 | neigh_changeaddr(&nd_tbl, dev); | |
2ac3ac8f | 1652 | fib6_run_gc(0, net, false); |
5cb04436 HFS |
1653 | idev = in6_dev_get(dev); |
1654 | if (!idev) | |
1655 | break; | |
1656 | if (idev->cnf.ndisc_notify) | |
1657 | ndisc_send_unsol_na(dev); | |
1658 | in6_dev_put(idev); | |
1da177e4 LT |
1659 | break; |
1660 | case NETDEV_DOWN: | |
1661 | neigh_ifdown(&nd_tbl, dev); | |
2ac3ac8f | 1662 | fib6_run_gc(0, net, false); |
1da177e4 | 1663 | break; |
f47b9464 BH |
1664 | case NETDEV_NOTIFY_PEERS: |
1665 | ndisc_send_unsol_na(dev); | |
1666 | break; | |
1da177e4 LT |
1667 | default: |
1668 | break; | |
1669 | } | |
1670 | ||
1671 | return NOTIFY_DONE; | |
1672 | } | |
1673 | ||
1674 | static struct notifier_block ndisc_netdev_notifier = { | |
1675 | .notifier_call = ndisc_netdev_event, | |
1676 | }; | |
1677 | ||
1678 | #ifdef CONFIG_SYSCTL | |
1679 | static void ndisc_warn_deprecated_sysctl(struct ctl_table *ctl, | |
1680 | const char *func, const char *dev_name) | |
1681 | { | |
1682 | static char warncomm[TASK_COMM_LEN]; | |
1683 | static int warned; | |
1684 | if (strcmp(warncomm, current->comm) && warned < 5) { | |
1685 | strcpy(warncomm, current->comm); | |
f3213831 | 1686 | 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 |
1687 | warncomm, func, |
1688 | dev_name, ctl->procname, | |
1689 | dev_name, ctl->procname); | |
1690 | warned++; | |
1691 | } | |
1692 | } | |
1693 | ||
8d65af78 | 1694 | int ndisc_ifinfo_sysctl_change(struct ctl_table *ctl, int write, void __user *buffer, size_t *lenp, loff_t *ppos) |
1da177e4 LT |
1695 | { |
1696 | struct net_device *dev = ctl->extra1; | |
1697 | struct inet6_dev *idev; | |
1698 | int ret; | |
1699 | ||
d12af679 EB |
1700 | if ((strcmp(ctl->procname, "retrans_time") == 0) || |
1701 | (strcmp(ctl->procname, "base_reachable_time") == 0)) | |
1da177e4 LT |
1702 | ndisc_warn_deprecated_sysctl(ctl, "syscall", dev ? dev->name : "default"); |
1703 | ||
d12af679 | 1704 | if (strcmp(ctl->procname, "retrans_time") == 0) |
cb5b09c1 | 1705 | ret = neigh_proc_dointvec(ctl, write, buffer, lenp, ppos); |
d12af679 EB |
1706 | |
1707 | else if (strcmp(ctl->procname, "base_reachable_time") == 0) | |
cb5b09c1 JP |
1708 | ret = neigh_proc_dointvec_jiffies(ctl, write, |
1709 | buffer, lenp, ppos); | |
d12af679 EB |
1710 | |
1711 | else if ((strcmp(ctl->procname, "retrans_time_ms") == 0) || | |
ad02ac14 | 1712 | (strcmp(ctl->procname, "base_reachable_time_ms") == 0)) |
cb5b09c1 JP |
1713 | ret = neigh_proc_dointvec_ms_jiffies(ctl, write, |
1714 | buffer, lenp, ppos); | |
d12af679 | 1715 | else |
1da177e4 | 1716 | ret = -1; |
1da177e4 LT |
1717 | |
1718 | if (write && ret == 0 && dev && (idev = in6_dev_get(dev)) != NULL) { | |
1f9248e5 JP |
1719 | if (ctl->data == &NEIGH_VAR(idev->nd_parms, BASE_REACHABLE_TIME)) |
1720 | idev->nd_parms->reachable_time = | |
1721 | neigh_rand_reach_time(NEIGH_VAR(idev->nd_parms, BASE_REACHABLE_TIME)); | |
1da177e4 LT |
1722 | idev->tstamp = jiffies; |
1723 | inet6_ifinfo_notify(RTM_NEWLINK, idev); | |
1724 | in6_dev_put(idev); | |
1725 | } | |
1726 | return ret; | |
1727 | } | |
1728 | ||
1da177e4 LT |
1729 | |
1730 | #endif | |
1731 | ||
2c8c1e72 | 1732 | static int __net_init ndisc_net_init(struct net *net) |
1da177e4 LT |
1733 | { |
1734 | struct ipv6_pinfo *np; | |
1735 | struct sock *sk; | |
1ab1457c | 1736 | int err; |
1da177e4 | 1737 | |
1ed8516f DL |
1738 | err = inet_ctl_sock_create(&sk, PF_INET6, |
1739 | SOCK_RAW, IPPROTO_ICMPV6, net); | |
1da177e4 | 1740 | if (err < 0) { |
675418d5 JP |
1741 | ND_PRINTK(0, err, |
1742 | "NDISC: Failed to initialize the control socket (err %d)\n", | |
1743 | err); | |
1da177e4 LT |
1744 | return err; |
1745 | } | |
1746 | ||
1ed8516f | 1747 | net->ipv6.ndisc_sk = sk; |
1762f7e8 | 1748 | |
1da177e4 | 1749 | np = inet6_sk(sk); |
1da177e4 LT |
1750 | np->hop_limit = 255; |
1751 | /* Do not loopback ndisc messages */ | |
1752 | np->mc_loop = 0; | |
1da177e4 | 1753 | |
1762f7e8 DL |
1754 | return 0; |
1755 | } | |
1756 | ||
2c8c1e72 | 1757 | static void __net_exit ndisc_net_exit(struct net *net) |
1762f7e8 | 1758 | { |
1ed8516f | 1759 | inet_ctl_sock_destroy(net->ipv6.ndisc_sk); |
1762f7e8 DL |
1760 | } |
1761 | ||
1762 | static struct pernet_operations ndisc_net_ops = { | |
1763 | .init = ndisc_net_init, | |
1764 | .exit = ndisc_net_exit, | |
1765 | }; | |
1766 | ||
1767 | int __init ndisc_init(void) | |
1768 | { | |
1769 | int err; | |
1770 | ||
1771 | err = register_pernet_subsys(&ndisc_net_ops); | |
1772 | if (err) | |
1773 | return err; | |
1ab1457c YH |
1774 | /* |
1775 | * Initialize the neighbour table | |
1776 | */ | |
d7480fd3 | 1777 | neigh_table_init(NEIGH_ND_TABLE, &nd_tbl); |
1da177e4 LT |
1778 | |
1779 | #ifdef CONFIG_SYSCTL | |
73af614a | 1780 | err = neigh_sysctl_register(NULL, &nd_tbl.parms, |
56ec0fb1 | 1781 | ndisc_ifinfo_sysctl_change); |
1762f7e8 DL |
1782 | if (err) |
1783 | goto out_unregister_pernet; | |
1762f7e8 | 1784 | out: |
bcd081a3 | 1785 | #endif |
1762f7e8 | 1786 | return err; |
1da177e4 | 1787 | |
1762f7e8 | 1788 | #ifdef CONFIG_SYSCTL |
1762f7e8 | 1789 | out_unregister_pernet: |
1762f7e8 DL |
1790 | unregister_pernet_subsys(&ndisc_net_ops); |
1791 | goto out; | |
2c861cc6 | 1792 | #endif |
1da177e4 LT |
1793 | } |
1794 | ||
2c861cc6 MK |
1795 | int __init ndisc_late_init(void) |
1796 | { | |
1797 | return register_netdevice_notifier(&ndisc_netdev_notifier); | |
1798 | } | |
1799 | ||
1800 | void ndisc_late_cleanup(void) | |
1da177e4 | 1801 | { |
36f73d0c | 1802 | unregister_netdevice_notifier(&ndisc_netdev_notifier); |
2c861cc6 MK |
1803 | } |
1804 | ||
1805 | void ndisc_cleanup(void) | |
1806 | { | |
1da177e4 LT |
1807 | #ifdef CONFIG_SYSCTL |
1808 | neigh_sysctl_unregister(&nd_tbl.parms); | |
1809 | #endif | |
d7480fd3 | 1810 | neigh_table_clear(NEIGH_ND_TABLE, &nd_tbl); |
1762f7e8 | 1811 | unregister_pernet_subsys(&ndisc_net_ops); |
1da177e4 | 1812 | } |