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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); |
1da177e4 LT |
87 | static int ndisc_constructor(struct neighbour *neigh); |
88 | static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb); | |
89 | static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb); | |
90 | static int pndisc_constructor(struct pneigh_entry *n); | |
91 | static void pndisc_destructor(struct pneigh_entry *n); | |
92 | static void pndisc_redo(struct sk_buff *skb); | |
93 | ||
89d69d2b | 94 | static const struct neigh_ops ndisc_generic_ops = { |
1da177e4 LT |
95 | .family = AF_INET6, |
96 | .solicit = ndisc_solicit, | |
97 | .error_report = ndisc_error_report, | |
98 | .output = neigh_resolve_output, | |
99 | .connected_output = neigh_connected_output, | |
1da177e4 LT |
100 | }; |
101 | ||
89d69d2b | 102 | static const struct neigh_ops ndisc_hh_ops = { |
1da177e4 LT |
103 | .family = AF_INET6, |
104 | .solicit = ndisc_solicit, | |
105 | .error_report = ndisc_error_report, | |
106 | .output = neigh_resolve_output, | |
107 | .connected_output = neigh_resolve_output, | |
1da177e4 LT |
108 | }; |
109 | ||
110 | ||
89d69d2b | 111 | static const struct neigh_ops ndisc_direct_ops = { |
1da177e4 | 112 | .family = AF_INET6, |
8f40b161 DM |
113 | .output = neigh_direct_output, |
114 | .connected_output = neigh_direct_output, | |
1da177e4 LT |
115 | }; |
116 | ||
117 | struct neigh_table nd_tbl = { | |
118 | .family = AF_INET6, | |
1da177e4 LT |
119 | .key_len = sizeof(struct in6_addr), |
120 | .hash = ndisc_hash, | |
121 | .constructor = ndisc_constructor, | |
122 | .pconstructor = pndisc_constructor, | |
123 | .pdestructor = pndisc_destructor, | |
124 | .proxy_redo = pndisc_redo, | |
125 | .id = "ndisc_cache", | |
126 | .parms = { | |
b672083e | 127 | .tbl = &nd_tbl, |
b672083e | 128 | .reachable_time = ND_REACHABLE_TIME, |
1f9248e5 JP |
129 | .data = { |
130 | [NEIGH_VAR_MCAST_PROBES] = 3, | |
131 | [NEIGH_VAR_UCAST_PROBES] = 3, | |
132 | [NEIGH_VAR_RETRANS_TIME] = ND_RETRANS_TIMER, | |
133 | [NEIGH_VAR_BASE_REACHABLE_TIME] = ND_REACHABLE_TIME, | |
134 | [NEIGH_VAR_DELAY_PROBE_TIME] = 5 * HZ, | |
135 | [NEIGH_VAR_GC_STALETIME] = 60 * HZ, | |
136 | [NEIGH_VAR_QUEUE_LEN_BYTES] = 64 * 1024, | |
137 | [NEIGH_VAR_PROXY_QLEN] = 64, | |
138 | [NEIGH_VAR_ANYCAST_DELAY] = 1 * HZ, | |
139 | [NEIGH_VAR_PROXY_DELAY] = (8 * HZ) / 10, | |
140 | }, | |
1da177e4 LT |
141 | }, |
142 | .gc_interval = 30 * HZ, | |
143 | .gc_thresh1 = 128, | |
144 | .gc_thresh2 = 512, | |
145 | .gc_thresh3 = 1024, | |
146 | }; | |
147 | ||
5f5a0115 | 148 | static void ndisc_fill_addr_option(struct sk_buff *skb, int type, void *data) |
1da177e4 | 149 | { |
5f5a0115 YH |
150 | int pad = ndisc_addr_option_pad(skb->dev->type); |
151 | int data_len = skb->dev->addr_len; | |
152 | int space = ndisc_opt_addr_space(skb->dev); | |
153 | u8 *opt = skb_put(skb, space); | |
1da177e4 LT |
154 | |
155 | opt[0] = type; | |
156 | opt[1] = space>>3; | |
157 | ||
158 | memset(opt + 2, 0, pad); | |
159 | opt += pad; | |
160 | space -= pad; | |
161 | ||
162 | memcpy(opt+2, data, data_len); | |
163 | data_len += 2; | |
164 | opt += data_len; | |
e5d08d71 IM |
165 | space -= data_len; |
166 | if (space > 0) | |
1da177e4 | 167 | memset(opt, 0, space); |
1da177e4 LT |
168 | } |
169 | ||
170 | static struct nd_opt_hdr *ndisc_next_option(struct nd_opt_hdr *cur, | |
171 | struct nd_opt_hdr *end) | |
172 | { | |
173 | int type; | |
174 | if (!cur || !end || cur >= end) | |
175 | return NULL; | |
176 | type = cur->nd_opt_type; | |
177 | do { | |
178 | cur = ((void *)cur) + (cur->nd_opt_len << 3); | |
67ba4152 | 179 | } while (cur < end && cur->nd_opt_type != type); |
a02cec21 | 180 | return cur <= end && cur->nd_opt_type == type ? cur : NULL; |
1da177e4 LT |
181 | } |
182 | ||
31910575 PY |
183 | static inline int ndisc_is_useropt(struct nd_opt_hdr *opt) |
184 | { | |
e35f30c1 AF |
185 | return opt->nd_opt_type == ND_OPT_RDNSS || |
186 | opt->nd_opt_type == ND_OPT_DNSSL; | |
31910575 PY |
187 | } |
188 | ||
189 | static struct nd_opt_hdr *ndisc_next_useropt(struct nd_opt_hdr *cur, | |
190 | struct nd_opt_hdr *end) | |
191 | { | |
192 | if (!cur || !end || cur >= end) | |
193 | return NULL; | |
194 | do { | |
195 | cur = ((void *)cur) + (cur->nd_opt_len << 3); | |
67ba4152 | 196 | } while (cur < end && !ndisc_is_useropt(cur)); |
a02cec21 | 197 | return cur <= end && ndisc_is_useropt(cur) ? cur : NULL; |
31910575 PY |
198 | } |
199 | ||
30f2a5f3 DM |
200 | struct ndisc_options *ndisc_parse_options(u8 *opt, int opt_len, |
201 | struct ndisc_options *ndopts) | |
1da177e4 LT |
202 | { |
203 | struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)opt; | |
204 | ||
205 | if (!nd_opt || opt_len < 0 || !ndopts) | |
206 | return NULL; | |
207 | memset(ndopts, 0, sizeof(*ndopts)); | |
208 | while (opt_len) { | |
209 | int l; | |
210 | if (opt_len < sizeof(struct nd_opt_hdr)) | |
211 | return NULL; | |
212 | l = nd_opt->nd_opt_len << 3; | |
213 | if (opt_len < l || l == 0) | |
214 | return NULL; | |
215 | switch (nd_opt->nd_opt_type) { | |
216 | case ND_OPT_SOURCE_LL_ADDR: | |
217 | case ND_OPT_TARGET_LL_ADDR: | |
218 | case ND_OPT_MTU: | |
219 | case ND_OPT_REDIRECT_HDR: | |
220 | if (ndopts->nd_opt_array[nd_opt->nd_opt_type]) { | |
675418d5 JP |
221 | ND_PRINTK(2, warn, |
222 | "%s: duplicated ND6 option found: type=%d\n", | |
223 | __func__, nd_opt->nd_opt_type); | |
1da177e4 LT |
224 | } else { |
225 | ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt; | |
226 | } | |
227 | break; | |
228 | case ND_OPT_PREFIX_INFO: | |
229 | ndopts->nd_opts_pi_end = nd_opt; | |
cfcabdcc | 230 | if (!ndopts->nd_opt_array[nd_opt->nd_opt_type]) |
1da177e4 LT |
231 | ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt; |
232 | break; | |
70ceb4f5 YH |
233 | #ifdef CONFIG_IPV6_ROUTE_INFO |
234 | case ND_OPT_ROUTE_INFO: | |
235 | ndopts->nd_opts_ri_end = nd_opt; | |
236 | if (!ndopts->nd_opts_ri) | |
237 | ndopts->nd_opts_ri = nd_opt; | |
238 | break; | |
239 | #endif | |
1da177e4 | 240 | default: |
31910575 PY |
241 | if (ndisc_is_useropt(nd_opt)) { |
242 | ndopts->nd_useropts_end = nd_opt; | |
243 | if (!ndopts->nd_useropts) | |
244 | ndopts->nd_useropts = nd_opt; | |
245 | } else { | |
246 | /* | |
247 | * Unknown options must be silently ignored, | |
248 | * to accommodate future extension to the | |
249 | * protocol. | |
250 | */ | |
675418d5 JP |
251 | ND_PRINTK(2, notice, |
252 | "%s: ignored unsupported option; type=%d, len=%d\n", | |
253 | __func__, | |
254 | nd_opt->nd_opt_type, | |
255 | nd_opt->nd_opt_len); | |
31910575 | 256 | } |
1da177e4 LT |
257 | } |
258 | opt_len -= l; | |
259 | nd_opt = ((void *)nd_opt) + l; | |
260 | } | |
261 | return ndopts; | |
262 | } | |
263 | ||
b71d1d42 | 264 | int ndisc_mc_map(const struct in6_addr *addr, char *buf, struct net_device *dev, int dir) |
1da177e4 LT |
265 | { |
266 | switch (dev->type) { | |
267 | case ARPHRD_ETHER: | |
268 | case ARPHRD_IEEE802: /* Not sure. Check it later. --ANK */ | |
269 | case ARPHRD_FDDI: | |
270 | ipv6_eth_mc_map(addr, buf); | |
271 | return 0; | |
1da177e4 LT |
272 | case ARPHRD_ARCNET: |
273 | ipv6_arcnet_mc_map(addr, buf); | |
274 | return 0; | |
275 | case ARPHRD_INFINIBAND: | |
a9e527e3 | 276 | ipv6_ib_mc_map(addr, dev->broadcast, buf); |
1da177e4 | 277 | return 0; |
93ca3bb5 TT |
278 | case ARPHRD_IPGRE: |
279 | return ipv6_ipgre_mc_map(addr, dev->broadcast, buf); | |
1da177e4 LT |
280 | default: |
281 | if (dir) { | |
282 | memcpy(buf, dev->broadcast, dev->addr_len); | |
283 | return 0; | |
284 | } | |
285 | } | |
286 | return -EINVAL; | |
287 | } | |
7159039a YH |
288 | EXPORT_SYMBOL(ndisc_mc_map); |
289 | ||
d6bf7817 ED |
290 | static u32 ndisc_hash(const void *pkey, |
291 | const struct net_device *dev, | |
2c2aba6c | 292 | __u32 *hash_rnd) |
1da177e4 | 293 | { |
2c2aba6c | 294 | return ndisc_hashfn(pkey, dev, hash_rnd); |
1da177e4 LT |
295 | } |
296 | ||
297 | static int ndisc_constructor(struct neighbour *neigh) | |
298 | { | |
67ba4152 | 299 | struct in6_addr *addr = (struct in6_addr *)&neigh->primary_key; |
1da177e4 LT |
300 | struct net_device *dev = neigh->dev; |
301 | struct inet6_dev *in6_dev; | |
302 | struct neigh_parms *parms; | |
a50feda5 | 303 | bool is_multicast = ipv6_addr_is_multicast(addr); |
1da177e4 | 304 | |
1da177e4 LT |
305 | in6_dev = in6_dev_get(dev); |
306 | if (in6_dev == NULL) { | |
1da177e4 LT |
307 | return -EINVAL; |
308 | } | |
309 | ||
310 | parms = in6_dev->nd_parms; | |
311 | __neigh_parms_put(neigh->parms); | |
312 | neigh->parms = neigh_parms_clone(parms); | |
1da177e4 LT |
313 | |
314 | neigh->type = is_multicast ? RTN_MULTICAST : RTN_UNICAST; | |
3b04ddde | 315 | if (!dev->header_ops) { |
1da177e4 LT |
316 | neigh->nud_state = NUD_NOARP; |
317 | neigh->ops = &ndisc_direct_ops; | |
8f40b161 | 318 | neigh->output = neigh_direct_output; |
1da177e4 LT |
319 | } else { |
320 | if (is_multicast) { | |
321 | neigh->nud_state = NUD_NOARP; | |
322 | ndisc_mc_map(addr, neigh->ha, dev, 1); | |
323 | } else if (dev->flags&(IFF_NOARP|IFF_LOOPBACK)) { | |
324 | neigh->nud_state = NUD_NOARP; | |
325 | memcpy(neigh->ha, dev->dev_addr, dev->addr_len); | |
326 | if (dev->flags&IFF_LOOPBACK) | |
327 | neigh->type = RTN_LOCAL; | |
328 | } else if (dev->flags&IFF_POINTOPOINT) { | |
329 | neigh->nud_state = NUD_NOARP; | |
330 | memcpy(neigh->ha, dev->broadcast, dev->addr_len); | |
331 | } | |
3b04ddde | 332 | if (dev->header_ops->cache) |
1da177e4 LT |
333 | neigh->ops = &ndisc_hh_ops; |
334 | else | |
335 | neigh->ops = &ndisc_generic_ops; | |
336 | if (neigh->nud_state&NUD_VALID) | |
337 | neigh->output = neigh->ops->connected_output; | |
338 | else | |
339 | neigh->output = neigh->ops->output; | |
340 | } | |
341 | in6_dev_put(in6_dev); | |
342 | return 0; | |
343 | } | |
344 | ||
345 | static int pndisc_constructor(struct pneigh_entry *n) | |
346 | { | |
67ba4152 | 347 | struct in6_addr *addr = (struct in6_addr *)&n->key; |
1da177e4 LT |
348 | struct in6_addr maddr; |
349 | struct net_device *dev = n->dev; | |
350 | ||
351 | if (dev == NULL || __in6_dev_get(dev) == NULL) | |
352 | return -EINVAL; | |
353 | addrconf_addr_solict_mult(addr, &maddr); | |
354 | ipv6_dev_mc_inc(dev, &maddr); | |
355 | return 0; | |
356 | } | |
357 | ||
358 | static void pndisc_destructor(struct pneigh_entry *n) | |
359 | { | |
67ba4152 | 360 | struct in6_addr *addr = (struct in6_addr *)&n->key; |
1da177e4 LT |
361 | struct in6_addr maddr; |
362 | struct net_device *dev = n->dev; | |
363 | ||
364 | if (dev == NULL || __in6_dev_get(dev) == NULL) | |
365 | return; | |
366 | addrconf_addr_solict_mult(addr, &maddr); | |
367 | ipv6_dev_mc_dec(dev, &maddr); | |
368 | } | |
369 | ||
de09334b YH |
370 | static struct sk_buff *ndisc_alloc_skb(struct net_device *dev, |
371 | int len) | |
372 | { | |
373 | int hlen = LL_RESERVED_SPACE(dev); | |
374 | int tlen = dev->needed_tailroom; | |
375 | struct sock *sk = dev_net(dev)->ipv6.ndisc_sk; | |
376 | struct sk_buff *skb; | |
de09334b | 377 | |
25a6e6b8 | 378 | skb = alloc_skb(hlen + sizeof(struct ipv6hdr) + len + tlen, GFP_ATOMIC); |
de09334b | 379 | if (!skb) { |
25a6e6b8 TG |
380 | ND_PRINTK(0, err, "ndisc: %s failed to allocate an skb\n", |
381 | __func__); | |
de09334b YH |
382 | return NULL; |
383 | } | |
384 | ||
f382d03a YH |
385 | skb->protocol = htons(ETH_P_IPV6); |
386 | skb->dev = dev; | |
387 | ||
527a150f | 388 | skb_reserve(skb, hlen + sizeof(struct ipv6hdr)); |
5135e633 | 389 | skb_reset_transport_header(skb); |
de09334b | 390 | |
25a6e6b8 TG |
391 | /* Manually assign socket ownership as we avoid calling |
392 | * sock_alloc_send_pskb() to bypass wmem buffer limits | |
393 | */ | |
394 | skb_set_owner_w(skb, sk); | |
395 | ||
de09334b YH |
396 | return skb; |
397 | } | |
398 | ||
f382d03a | 399 | static void ip6_nd_hdr(struct sk_buff *skb, |
2576f17d YH |
400 | const struct in6_addr *saddr, |
401 | const struct in6_addr *daddr, | |
c8d6c380 | 402 | int hop_limit, int len) |
2576f17d YH |
403 | { |
404 | struct ipv6hdr *hdr; | |
405 | ||
527a150f | 406 | skb_push(skb, sizeof(*hdr)); |
2576f17d | 407 | skb_reset_network_header(skb); |
2576f17d YH |
408 | hdr = ipv6_hdr(skb); |
409 | ||
410 | ip6_flow_hdr(hdr, 0, 0); | |
411 | ||
412 | hdr->payload_len = htons(len); | |
c8d6c380 YH |
413 | hdr->nexthdr = IPPROTO_ICMPV6; |
414 | hdr->hop_limit = hop_limit; | |
2576f17d YH |
415 | |
416 | hdr->saddr = *saddr; | |
417 | hdr->daddr = *daddr; | |
418 | } | |
419 | ||
af9a9976 | 420 | static void ndisc_send_skb(struct sk_buff *skb, |
fd0ea7db | 421 | const struct in6_addr *daddr, |
aa4bdd4b | 422 | const struct in6_addr *saddr) |
305d552a | 423 | { |
f4de84c6 | 424 | struct dst_entry *dst = skb_dst(skb); |
af9a9976 | 425 | struct net *net = dev_net(skb->dev); |
7b3d9b06 | 426 | struct sock *sk = net->ipv6.ndisc_sk; |
305d552a BH |
427 | struct inet6_dev *idev; |
428 | int err; | |
aa4bdd4b | 429 | struct icmp6hdr *icmp6h = icmp6_hdr(skb); |
305d552a BH |
430 | u8 type; |
431 | ||
432 | type = icmp6h->icmp6_type; | |
433 | ||
f4de84c6 | 434 | if (!dst) { |
f4de84c6 | 435 | struct flowi6 fl6; |
305d552a | 436 | |
f4de84c6 YH |
437 | icmpv6_flow_init(sk, &fl6, type, saddr, daddr, skb->dev->ifindex); |
438 | dst = icmp6_dst_alloc(skb->dev, &fl6); | |
439 | if (IS_ERR(dst)) { | |
440 | kfree_skb(skb); | |
441 | return; | |
442 | } | |
443 | ||
444 | skb_dst_set(skb, dst); | |
445 | } | |
e1ec7842 | 446 | |
7b3d9b06 YH |
447 | icmp6h->icmp6_cksum = csum_ipv6_magic(saddr, daddr, skb->len, |
448 | IPPROTO_ICMPV6, | |
449 | csum_partial(icmp6h, | |
450 | skb->len, 0)); | |
451 | ||
452 | ip6_nd_hdr(skb, saddr, daddr, inet6_sk(sk)->hop_limit, skb->len); | |
453 | ||
cfdf7647 ED |
454 | rcu_read_lock(); |
455 | idev = __in6_dev_get(dst->dev); | |
edf391ff | 456 | IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len); |
e1ec7842 | 457 | |
b2e0b385 | 458 | err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, dst->dev, |
6e23ae2a | 459 | dst_output); |
1da177e4 | 460 | if (!err) { |
5c5d244b | 461 | ICMP6MSGOUT_INC_STATS(net, idev, type); |
a862f6a6 | 462 | ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); |
1da177e4 LT |
463 | } |
464 | ||
cfdf7647 | 465 | rcu_read_unlock(); |
1ab1457c | 466 | } |
1da177e4 | 467 | |
f564f45c CW |
468 | void ndisc_send_na(struct net_device *dev, struct neighbour *neigh, |
469 | const struct in6_addr *daddr, | |
470 | const struct in6_addr *solicited_addr, | |
471 | bool router, bool solicited, bool override, bool inc_opt) | |
e1ec7842 | 472 | { |
b44b5f4a | 473 | struct sk_buff *skb; |
e1ec7842 YH |
474 | struct in6_addr tmpaddr; |
475 | struct inet6_ifaddr *ifp; | |
9acd9f3a | 476 | const struct in6_addr *src_addr; |
1cb3fe51 YH |
477 | struct nd_msg *msg; |
478 | int optlen = 0; | |
e1ec7842 YH |
479 | |
480 | /* for anycast or proxy, solicited_addr != src_addr */ | |
c346dca1 | 481 | ifp = ipv6_get_ifaddr(dev_net(dev), solicited_addr, dev, 1); |
e1ec7842 YH |
482 | if (ifp) { |
483 | src_addr = solicited_addr; | |
484 | if (ifp->flags & IFA_F_OPTIMISTIC) | |
f2f79cca | 485 | override = false; |
9f888160 | 486 | inc_opt |= ifp->idev->cnf.force_tllao; |
e1ec7842 YH |
487 | in6_ifa_put(ifp); |
488 | } else { | |
191cd582 | 489 | if (ipv6_dev_get_saddr(dev_net(dev), dev, daddr, |
c346dca1 | 490 | inet6_sk(dev_net(dev)->ipv6.ndisc_sk)->srcprefs, |
7cbca67c | 491 | &tmpaddr)) |
e1ec7842 YH |
492 | return; |
493 | src_addr = &tmpaddr; | |
494 | } | |
495 | ||
1cb3fe51 YH |
496 | if (!dev->addr_len) |
497 | inc_opt = 0; | |
498 | if (inc_opt) | |
499 | optlen += ndisc_opt_addr_space(dev); | |
e1ec7842 | 500 | |
1cb3fe51 | 501 | skb = ndisc_alloc_skb(dev, sizeof(*msg) + optlen); |
b44b5f4a YH |
502 | if (!skb) |
503 | return; | |
504 | ||
1cb3fe51 YH |
505 | msg = (struct nd_msg *)skb_put(skb, sizeof(*msg)); |
506 | *msg = (struct nd_msg) { | |
507 | .icmph = { | |
508 | .icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT, | |
509 | .icmp6_router = router, | |
510 | .icmp6_solicited = solicited, | |
511 | .icmp6_override = override, | |
512 | }, | |
513 | .target = *solicited_addr, | |
514 | }; | |
515 | ||
516 | if (inc_opt) | |
517 | ndisc_fill_addr_option(skb, ND_OPT_TARGET_LL_ADDR, | |
518 | dev->dev_addr); | |
519 | ||
520 | ||
b44b5f4a | 521 | ndisc_send_skb(skb, daddr, src_addr); |
e1ec7842 YH |
522 | } |
523 | ||
f47b9464 BH |
524 | static void ndisc_send_unsol_na(struct net_device *dev) |
525 | { | |
526 | struct inet6_dev *idev; | |
527 | struct inet6_ifaddr *ifa; | |
f47b9464 BH |
528 | |
529 | idev = in6_dev_get(dev); | |
530 | if (!idev) | |
531 | return; | |
532 | ||
533 | read_lock_bh(&idev->lock); | |
534 | list_for_each_entry(ifa, &idev->addr_list, if_list) { | |
9fafd65a | 535 | ndisc_send_na(dev, NULL, &in6addr_linklocal_allnodes, &ifa->addr, |
f47b9464 BH |
536 | /*router=*/ !!idev->cnf.forwarding, |
537 | /*solicited=*/ false, /*override=*/ true, | |
538 | /*inc_opt=*/ true); | |
539 | } | |
540 | read_unlock_bh(&idev->lock); | |
541 | ||
542 | in6_dev_put(idev); | |
543 | } | |
544 | ||
1da177e4 | 545 | void ndisc_send_ns(struct net_device *dev, struct neighbour *neigh, |
9acd9f3a YH |
546 | const struct in6_addr *solicit, |
547 | const struct in6_addr *daddr, const struct in6_addr *saddr) | |
1da177e4 | 548 | { |
b44b5f4a | 549 | struct sk_buff *skb; |
1da177e4 | 550 | struct in6_addr addr_buf; |
1cb3fe51 YH |
551 | int inc_opt = dev->addr_len; |
552 | int optlen = 0; | |
553 | struct nd_msg *msg; | |
1da177e4 LT |
554 | |
555 | if (saddr == NULL) { | |
95c385b4 NH |
556 | if (ipv6_get_lladdr(dev, &addr_buf, |
557 | (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC))) | |
1da177e4 LT |
558 | return; |
559 | saddr = &addr_buf; | |
560 | } | |
561 | ||
1cb3fe51 | 562 | if (ipv6_addr_any(saddr)) |
f2f79cca | 563 | inc_opt = false; |
1cb3fe51 YH |
564 | if (inc_opt) |
565 | optlen += ndisc_opt_addr_space(dev); | |
566 | ||
567 | skb = ndisc_alloc_skb(dev, sizeof(*msg) + optlen); | |
b44b5f4a YH |
568 | if (!skb) |
569 | return; | |
570 | ||
1cb3fe51 YH |
571 | msg = (struct nd_msg *)skb_put(skb, sizeof(*msg)); |
572 | *msg = (struct nd_msg) { | |
573 | .icmph = { | |
574 | .icmp6_type = NDISC_NEIGHBOUR_SOLICITATION, | |
575 | }, | |
576 | .target = *solicit, | |
577 | }; | |
578 | ||
579 | if (inc_opt) | |
580 | ndisc_fill_addr_option(skb, ND_OPT_SOURCE_LL_ADDR, | |
581 | dev->dev_addr); | |
582 | ||
b44b5f4a | 583 | ndisc_send_skb(skb, daddr, saddr); |
1da177e4 LT |
584 | } |
585 | ||
9acd9f3a YH |
586 | void ndisc_send_rs(struct net_device *dev, const struct in6_addr *saddr, |
587 | const struct in6_addr *daddr) | |
1da177e4 | 588 | { |
b44b5f4a | 589 | struct sk_buff *skb; |
1cb3fe51 | 590 | struct rs_msg *msg; |
95c385b4 | 591 | int send_sllao = dev->addr_len; |
1cb3fe51 | 592 | int optlen = 0; |
95c385b4 NH |
593 | |
594 | #ifdef CONFIG_IPV6_OPTIMISTIC_DAD | |
595 | /* | |
596 | * According to section 2.2 of RFC 4429, we must not | |
597 | * send router solicitations with a sllao from | |
598 | * optimistic addresses, but we may send the solicitation | |
599 | * if we don't include the sllao. So here we check | |
600 | * if our address is optimistic, and if so, we | |
bea85195 | 601 | * suppress the inclusion of the sllao. |
95c385b4 NH |
602 | */ |
603 | if (send_sllao) { | |
c346dca1 | 604 | struct inet6_ifaddr *ifp = ipv6_get_ifaddr(dev_net(dev), saddr, |
1cab3da6 | 605 | dev, 1); |
95c385b4 NH |
606 | if (ifp) { |
607 | if (ifp->flags & IFA_F_OPTIMISTIC) { | |
ca043569 | 608 | send_sllao = 0; |
95c385b4 | 609 | } |
ca043569 | 610 | in6_ifa_put(ifp); |
95c385b4 NH |
611 | } else { |
612 | send_sllao = 0; | |
613 | } | |
614 | } | |
615 | #endif | |
1cb3fe51 YH |
616 | if (send_sllao) |
617 | optlen += ndisc_opt_addr_space(dev); | |
618 | ||
619 | skb = ndisc_alloc_skb(dev, sizeof(*msg) + optlen); | |
b44b5f4a YH |
620 | if (!skb) |
621 | return; | |
622 | ||
1cb3fe51 YH |
623 | msg = (struct rs_msg *)skb_put(skb, sizeof(*msg)); |
624 | *msg = (struct rs_msg) { | |
625 | .icmph = { | |
626 | .icmp6_type = NDISC_ROUTER_SOLICITATION, | |
627 | }, | |
628 | }; | |
629 | ||
630 | if (send_sllao) | |
631 | ndisc_fill_addr_option(skb, ND_OPT_SOURCE_LL_ADDR, | |
632 | dev->dev_addr); | |
633 | ||
b44b5f4a | 634 | ndisc_send_skb(skb, daddr, saddr); |
1da177e4 | 635 | } |
1ab1457c | 636 | |
1da177e4 LT |
637 | |
638 | static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb) | |
639 | { | |
640 | /* | |
641 | * "The sender MUST return an ICMP | |
642 | * destination unreachable" | |
643 | */ | |
644 | dst_link_failure(skb); | |
645 | kfree_skb(skb); | |
646 | } | |
647 | ||
648 | /* Called with locked neigh: either read or both */ | |
649 | ||
650 | static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb) | |
651 | { | |
652 | struct in6_addr *saddr = NULL; | |
653 | struct in6_addr mcaddr; | |
654 | struct net_device *dev = neigh->dev; | |
655 | struct in6_addr *target = (struct in6_addr *)&neigh->primary_key; | |
656 | int probes = atomic_read(&neigh->probes); | |
657 | ||
c58da4c6 EK |
658 | if (skb && ipv6_chk_addr_and_flags(dev_net(dev), &ipv6_hdr(skb)->saddr, |
659 | dev, 1, | |
660 | IFA_F_TENTATIVE|IFA_F_OPTIMISTIC)) | |
0660e03f | 661 | saddr = &ipv6_hdr(skb)->saddr; |
e5d08d71 IM |
662 | probes -= NEIGH_VAR(neigh->parms, UCAST_PROBES); |
663 | if (probes < 0) { | |
1da177e4 | 664 | if (!(neigh->nud_state & NUD_VALID)) { |
675418d5 JP |
665 | ND_PRINTK(1, dbg, |
666 | "%s: trying to ucast probe in NUD_INVALID: %pI6\n", | |
667 | __func__, target); | |
1da177e4 LT |
668 | } |
669 | ndisc_send_ns(dev, neigh, target, target, saddr); | |
1f9248e5 | 670 | } else if ((probes -= NEIGH_VAR(neigh->parms, APP_PROBES)) < 0) { |
1da177e4 | 671 | neigh_app_ns(neigh); |
1da177e4 LT |
672 | } else { |
673 | addrconf_addr_solict_mult(target, &mcaddr); | |
674 | ndisc_send_ns(dev, NULL, target, &mcaddr, saddr); | |
675 | } | |
676 | } | |
677 | ||
0736ffc0 YH |
678 | static int pndisc_is_router(const void *pkey, |
679 | struct net_device *dev) | |
fa86d322 PE |
680 | { |
681 | struct pneigh_entry *n; | |
0736ffc0 | 682 | int ret = -1; |
fa86d322 PE |
683 | |
684 | read_lock_bh(&nd_tbl.lock); | |
0736ffc0 YH |
685 | n = __pneigh_lookup(&nd_tbl, dev_net(dev), pkey, dev); |
686 | if (n) | |
687 | ret = !!(n->flags & NTF_ROUTER); | |
fa86d322 PE |
688 | read_unlock_bh(&nd_tbl.lock); |
689 | ||
0736ffc0 | 690 | return ret; |
fa86d322 PE |
691 | } |
692 | ||
1da177e4 LT |
693 | static void ndisc_recv_ns(struct sk_buff *skb) |
694 | { | |
9c70220b | 695 | struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb); |
b71d1d42 ED |
696 | const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; |
697 | const struct in6_addr *daddr = &ipv6_hdr(skb)->daddr; | |
1da177e4 | 698 | u8 *lladdr = NULL; |
29a3cad5 | 699 | u32 ndoptlen = skb_tail_pointer(skb) - (skb_transport_header(skb) + |
27a884dc | 700 | offsetof(struct nd_msg, opt)); |
1da177e4 LT |
701 | struct ndisc_options ndopts; |
702 | struct net_device *dev = skb->dev; | |
703 | struct inet6_ifaddr *ifp; | |
704 | struct inet6_dev *idev = NULL; | |
705 | struct neighbour *neigh; | |
706 | int dad = ipv6_addr_any(saddr); | |
a50feda5 | 707 | bool inc; |
0736ffc0 | 708 | int is_router = -1; |
1da177e4 | 709 | |
115b0aa6 YH |
710 | if (skb->len < sizeof(struct nd_msg)) { |
711 | ND_PRINTK(2, warn, "NS: packet too short\n"); | |
712 | return; | |
713 | } | |
714 | ||
1da177e4 | 715 | if (ipv6_addr_is_multicast(&msg->target)) { |
675418d5 | 716 | ND_PRINTK(2, warn, "NS: multicast target address\n"); |
1da177e4 LT |
717 | return; |
718 | } | |
719 | ||
720 | /* | |
721 | * RFC2461 7.1.1: | |
722 | * DAD has to be destined for solicited node multicast address. | |
723 | */ | |
ca97a644 | 724 | if (dad && !ipv6_addr_is_solict_mult(daddr)) { |
675418d5 | 725 | ND_PRINTK(2, warn, "NS: bad DAD packet (wrong destination)\n"); |
1da177e4 LT |
726 | return; |
727 | } | |
728 | ||
729 | if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) { | |
675418d5 | 730 | ND_PRINTK(2, warn, "NS: invalid ND options\n"); |
1da177e4 LT |
731 | return; |
732 | } | |
733 | ||
734 | if (ndopts.nd_opts_src_lladdr) { | |
735 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, dev); | |
736 | if (!lladdr) { | |
675418d5 JP |
737 | ND_PRINTK(2, warn, |
738 | "NS: invalid link-layer address length\n"); | |
1da177e4 LT |
739 | return; |
740 | } | |
741 | ||
742 | /* RFC2461 7.1.1: | |
1ab1457c YH |
743 | * If the IP source address is the unspecified address, |
744 | * there MUST NOT be source link-layer address option | |
1da177e4 LT |
745 | * in the message. |
746 | */ | |
747 | if (dad) { | |
675418d5 JP |
748 | ND_PRINTK(2, warn, |
749 | "NS: bad DAD packet (link-layer address option)\n"); | |
1da177e4 LT |
750 | return; |
751 | } | |
752 | } | |
753 | ||
754 | inc = ipv6_addr_is_multicast(daddr); | |
755 | ||
c346dca1 | 756 | ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1); |
a18bc695 | 757 | if (ifp) { |
95c385b4 NH |
758 | |
759 | if (ifp->flags & (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC)) { | |
760 | if (dad) { | |
95c385b4 NH |
761 | /* |
762 | * We are colliding with another node | |
763 | * who is doing DAD | |
764 | * so fail our DAD process | |
765 | */ | |
766 | addrconf_dad_failure(ifp); | |
9e3be4b3 | 767 | return; |
95c385b4 NH |
768 | } else { |
769 | /* | |
770 | * This is not a dad solicitation. | |
771 | * If we are an optimistic node, | |
772 | * we should respond. | |
773 | * Otherwise, we should ignore it. | |
774 | */ | |
775 | if (!(ifp->flags & IFA_F_OPTIMISTIC)) | |
1da177e4 | 776 | goto out; |
1da177e4 | 777 | } |
1da177e4 LT |
778 | } |
779 | ||
780 | idev = ifp->idev; | |
781 | } else { | |
53b7997f YH |
782 | struct net *net = dev_net(dev); |
783 | ||
1da177e4 LT |
784 | idev = in6_dev_get(dev); |
785 | if (!idev) { | |
786 | /* XXX: count this drop? */ | |
787 | return; | |
788 | } | |
789 | ||
53b7997f | 790 | if (ipv6_chk_acast_addr(net, dev, &msg->target) || |
1ab1457c | 791 | (idev->cnf.forwarding && |
53b7997f | 792 | (net->ipv6.devconf_all->proxy_ndp || idev->cnf.proxy_ndp) && |
0736ffc0 | 793 | (is_router = pndisc_is_router(&msg->target, dev)) >= 0)) { |
a61bbcf2 | 794 | if (!(NEIGH_CB(skb)->flags & LOCALLY_ENQUEUED) && |
1da177e4 | 795 | skb->pkt_type != PACKET_HOST && |
f2f79cca | 796 | inc && |
1f9248e5 | 797 | NEIGH_VAR(idev->nd_parms, PROXY_DELAY) != 0) { |
1da177e4 LT |
798 | /* |
799 | * for anycast or proxy, | |
1ab1457c YH |
800 | * sender should delay its response |
801 | * by a random time between 0 and | |
1da177e4 LT |
802 | * MAX_ANYCAST_DELAY_TIME seconds. |
803 | * (RFC2461) -- yoshfuji | |
804 | */ | |
805 | struct sk_buff *n = skb_clone(skb, GFP_ATOMIC); | |
806 | if (n) | |
807 | pneigh_enqueue(&nd_tbl, idev->nd_parms, n); | |
808 | goto out; | |
809 | } | |
810 | } else | |
811 | goto out; | |
812 | } | |
813 | ||
0736ffc0 | 814 | if (is_router < 0) |
fb568637 | 815 | is_router = idev->cnf.forwarding; |
62dd9318 | 816 | |
1da177e4 | 817 | if (dad) { |
f3ee4010 | 818 | ndisc_send_na(dev, NULL, &in6addr_linklocal_allnodes, &msg->target, |
fb568637 | 819 | !!is_router, false, (ifp != NULL), true); |
1da177e4 LT |
820 | goto out; |
821 | } | |
822 | ||
823 | if (inc) | |
824 | NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_mcast); | |
825 | else | |
826 | NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_ucast); | |
827 | ||
1ab1457c | 828 | /* |
1da177e4 LT |
829 | * update / create cache entry |
830 | * for the source address | |
831 | */ | |
832 | neigh = __neigh_lookup(&nd_tbl, saddr, dev, | |
833 | !inc || lladdr || !dev->addr_len); | |
834 | if (neigh) | |
1ab1457c | 835 | neigh_update(neigh, lladdr, NUD_STALE, |
1da177e4 LT |
836 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
837 | NEIGH_UPDATE_F_OVERRIDE); | |
3b04ddde | 838 | if (neigh || !dev->header_ops) { |
1da177e4 | 839 | ndisc_send_na(dev, neigh, saddr, &msg->target, |
fb568637 YH |
840 | !!is_router, |
841 | true, (ifp != NULL && inc), inc); | |
1da177e4 LT |
842 | if (neigh) |
843 | neigh_release(neigh); | |
844 | } | |
845 | ||
846 | out: | |
847 | if (ifp) | |
848 | in6_ifa_put(ifp); | |
849 | else | |
850 | in6_dev_put(idev); | |
1da177e4 LT |
851 | } |
852 | ||
853 | static void ndisc_recv_na(struct sk_buff *skb) | |
854 | { | |
9c70220b | 855 | struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb); |
be7a010d | 856 | struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; |
b71d1d42 | 857 | const struct in6_addr *daddr = &ipv6_hdr(skb)->daddr; |
1da177e4 | 858 | u8 *lladdr = NULL; |
29a3cad5 | 859 | u32 ndoptlen = skb_tail_pointer(skb) - (skb_transport_header(skb) + |
27a884dc | 860 | offsetof(struct nd_msg, opt)); |
1da177e4 LT |
861 | struct ndisc_options ndopts; |
862 | struct net_device *dev = skb->dev; | |
863 | struct inet6_ifaddr *ifp; | |
864 | struct neighbour *neigh; | |
865 | ||
866 | if (skb->len < sizeof(struct nd_msg)) { | |
675418d5 | 867 | ND_PRINTK(2, warn, "NA: packet too short\n"); |
1da177e4 LT |
868 | return; |
869 | } | |
870 | ||
871 | if (ipv6_addr_is_multicast(&msg->target)) { | |
675418d5 | 872 | ND_PRINTK(2, warn, "NA: target address is multicast\n"); |
1da177e4 LT |
873 | return; |
874 | } | |
875 | ||
876 | if (ipv6_addr_is_multicast(daddr) && | |
877 | msg->icmph.icmp6_solicited) { | |
675418d5 | 878 | ND_PRINTK(2, warn, "NA: solicited NA is multicasted\n"); |
1da177e4 LT |
879 | return; |
880 | } | |
1ab1457c | 881 | |
1da177e4 | 882 | if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) { |
675418d5 | 883 | ND_PRINTK(2, warn, "NS: invalid ND option\n"); |
1da177e4 LT |
884 | return; |
885 | } | |
886 | if (ndopts.nd_opts_tgt_lladdr) { | |
887 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, dev); | |
888 | if (!lladdr) { | |
675418d5 JP |
889 | ND_PRINTK(2, warn, |
890 | "NA: invalid link-layer address length\n"); | |
1da177e4 LT |
891 | return; |
892 | } | |
893 | } | |
c346dca1 | 894 | ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1); |
a18bc695 | 895 | if (ifp) { |
bd015928 DW |
896 | if (skb->pkt_type != PACKET_LOOPBACK |
897 | && (ifp->flags & IFA_F_TENTATIVE)) { | |
898 | addrconf_dad_failure(ifp); | |
899 | return; | |
1da177e4 LT |
900 | } |
901 | /* What should we make now? The advertisement | |
902 | is invalid, but ndisc specs say nothing | |
903 | about it. It could be misconfiguration, or | |
904 | an smart proxy agent tries to help us :-) | |
24fc7b86 JS |
905 | |
906 | We should not print the error if NA has been | |
907 | received from loopback - it is just our own | |
908 | unsolicited advertisement. | |
1da177e4 | 909 | */ |
24fc7b86 | 910 | if (skb->pkt_type != PACKET_LOOPBACK) |
675418d5 JP |
911 | ND_PRINTK(1, warn, |
912 | "NA: someone advertises our address %pI6 on %s!\n", | |
913 | &ifp->addr, ifp->idev->dev->name); | |
1da177e4 LT |
914 | in6_ifa_put(ifp); |
915 | return; | |
916 | } | |
917 | neigh = neigh_lookup(&nd_tbl, &msg->target, dev); | |
918 | ||
919 | if (neigh) { | |
920 | u8 old_flags = neigh->flags; | |
53b7997f | 921 | struct net *net = dev_net(dev); |
1da177e4 LT |
922 | |
923 | if (neigh->nud_state & NUD_FAILED) | |
924 | goto out; | |
925 | ||
5f3e6e9e VN |
926 | /* |
927 | * Don't update the neighbor cache entry on a proxy NA from | |
928 | * ourselves because either the proxied node is off link or it | |
929 | * has already sent a NA to us. | |
930 | */ | |
931 | if (lladdr && !memcmp(lladdr, dev->dev_addr, dev->addr_len) && | |
53b7997f YH |
932 | net->ipv6.devconf_all->forwarding && net->ipv6.devconf_all->proxy_ndp && |
933 | pneigh_lookup(&nd_tbl, net, &msg->target, dev, 0)) { | |
b20b6d97 | 934 | /* XXX: idev->cnf.proxy_ndp */ |
5f3e6e9e | 935 | goto out; |
fbea49e1 | 936 | } |
5f3e6e9e | 937 | |
1da177e4 LT |
938 | neigh_update(neigh, lladdr, |
939 | msg->icmph.icmp6_solicited ? NUD_REACHABLE : NUD_STALE, | |
940 | NEIGH_UPDATE_F_WEAK_OVERRIDE| | |
941 | (msg->icmph.icmp6_override ? NEIGH_UPDATE_F_OVERRIDE : 0)| | |
942 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
943 | (msg->icmph.icmp6_router ? NEIGH_UPDATE_F_ISROUTER : 0)); | |
944 | ||
945 | if ((old_flags & ~neigh->flags) & NTF_ROUTER) { | |
946 | /* | |
947 | * Change: router to host | |
948 | */ | |
be7a010d | 949 | rt6_clean_tohost(dev_net(dev), saddr); |
1da177e4 LT |
950 | } |
951 | ||
952 | out: | |
953 | neigh_release(neigh); | |
954 | } | |
955 | } | |
956 | ||
957 | static void ndisc_recv_rs(struct sk_buff *skb) | |
958 | { | |
9c70220b | 959 | struct rs_msg *rs_msg = (struct rs_msg *)skb_transport_header(skb); |
1da177e4 LT |
960 | unsigned long ndoptlen = skb->len - sizeof(*rs_msg); |
961 | struct neighbour *neigh; | |
962 | struct inet6_dev *idev; | |
b71d1d42 | 963 | const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; |
1da177e4 LT |
964 | struct ndisc_options ndopts; |
965 | u8 *lladdr = NULL; | |
966 | ||
967 | if (skb->len < sizeof(*rs_msg)) | |
968 | return; | |
969 | ||
cfdf7647 | 970 | idev = __in6_dev_get(skb->dev); |
1da177e4 | 971 | if (!idev) { |
675418d5 | 972 | ND_PRINTK(1, err, "RS: can't find in6 device\n"); |
1da177e4 LT |
973 | return; |
974 | } | |
975 | ||
976 | /* Don't accept RS if we're not in router mode */ | |
977 | if (!idev->cnf.forwarding) | |
978 | goto out; | |
979 | ||
980 | /* | |
981 | * Don't update NCE if src = ::; | |
982 | * this implies that the source node has no ip address assigned yet. | |
983 | */ | |
984 | if (ipv6_addr_any(saddr)) | |
985 | goto out; | |
986 | ||
987 | /* Parse ND options */ | |
988 | if (!ndisc_parse_options(rs_msg->opt, ndoptlen, &ndopts)) { | |
675418d5 | 989 | ND_PRINTK(2, notice, "NS: invalid ND option, ignored\n"); |
1da177e4 LT |
990 | goto out; |
991 | } | |
992 | ||
993 | if (ndopts.nd_opts_src_lladdr) { | |
994 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, | |
995 | skb->dev); | |
996 | if (!lladdr) | |
997 | goto out; | |
998 | } | |
999 | ||
1000 | neigh = __neigh_lookup(&nd_tbl, saddr, skb->dev, 1); | |
1001 | if (neigh) { | |
1002 | neigh_update(neigh, lladdr, NUD_STALE, | |
1003 | NEIGH_UPDATE_F_WEAK_OVERRIDE| | |
1004 | NEIGH_UPDATE_F_OVERRIDE| | |
1005 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER); | |
1006 | neigh_release(neigh); | |
1007 | } | |
1008 | out: | |
cfdf7647 | 1009 | return; |
1da177e4 LT |
1010 | } |
1011 | ||
31910575 PY |
1012 | static void ndisc_ra_useropt(struct sk_buff *ra, struct nd_opt_hdr *opt) |
1013 | { | |
1014 | struct icmp6hdr *icmp6h = (struct icmp6hdr *)skb_transport_header(ra); | |
1015 | struct sk_buff *skb; | |
1016 | struct nlmsghdr *nlh; | |
1017 | struct nduseroptmsg *ndmsg; | |
c346dca1 | 1018 | struct net *net = dev_net(ra->dev); |
31910575 PY |
1019 | int err; |
1020 | int base_size = NLMSG_ALIGN(sizeof(struct nduseroptmsg) | |
1021 | + (opt->nd_opt_len << 3)); | |
1022 | size_t msg_size = base_size + nla_total_size(sizeof(struct in6_addr)); | |
1023 | ||
1024 | skb = nlmsg_new(msg_size, GFP_ATOMIC); | |
1025 | if (skb == NULL) { | |
1026 | err = -ENOBUFS; | |
1027 | goto errout; | |
1028 | } | |
1029 | ||
1030 | nlh = nlmsg_put(skb, 0, 0, RTM_NEWNDUSEROPT, base_size, 0); | |
1031 | if (nlh == NULL) { | |
1032 | goto nla_put_failure; | |
1033 | } | |
1034 | ||
1035 | ndmsg = nlmsg_data(nlh); | |
1036 | ndmsg->nduseropt_family = AF_INET6; | |
dbb2ed24 | 1037 | ndmsg->nduseropt_ifindex = ra->dev->ifindex; |
31910575 PY |
1038 | ndmsg->nduseropt_icmp_type = icmp6h->icmp6_type; |
1039 | ndmsg->nduseropt_icmp_code = icmp6h->icmp6_code; | |
1040 | ndmsg->nduseropt_opts_len = opt->nd_opt_len << 3; | |
1041 | ||
1042 | memcpy(ndmsg + 1, opt, opt->nd_opt_len << 3); | |
1043 | ||
c78679e8 DM |
1044 | if (nla_put(skb, NDUSEROPT_SRCADDR, sizeof(struct in6_addr), |
1045 | &ipv6_hdr(ra)->saddr)) | |
1046 | goto nla_put_failure; | |
31910575 PY |
1047 | nlmsg_end(skb, nlh); |
1048 | ||
1ce85fe4 | 1049 | rtnl_notify(skb, net, 0, RTNLGRP_ND_USEROPT, NULL, GFP_ATOMIC); |
31910575 PY |
1050 | return; |
1051 | ||
1052 | nla_put_failure: | |
1053 | nlmsg_free(skb); | |
1054 | err = -EMSGSIZE; | |
1055 | errout: | |
a18bc695 | 1056 | rtnl_set_sk_err(net, RTNLGRP_ND_USEROPT, err); |
31910575 PY |
1057 | } |
1058 | ||
1da177e4 LT |
1059 | static void ndisc_router_discovery(struct sk_buff *skb) |
1060 | { | |
9c70220b | 1061 | struct ra_msg *ra_msg = (struct ra_msg *)skb_transport_header(skb); |
1da177e4 LT |
1062 | struct neighbour *neigh = NULL; |
1063 | struct inet6_dev *in6_dev; | |
65f5c7c1 | 1064 | struct rt6_info *rt = NULL; |
1da177e4 LT |
1065 | int lifetime; |
1066 | struct ndisc_options ndopts; | |
1067 | int optlen; | |
ebacaaa0 | 1068 | unsigned int pref = 0; |
1da177e4 | 1069 | |
67ba4152 | 1070 | __u8 *opt = (__u8 *)(ra_msg + 1); |
1da177e4 | 1071 | |
29a3cad5 SH |
1072 | optlen = (skb_tail_pointer(skb) - skb_transport_header(skb)) - |
1073 | sizeof(struct ra_msg); | |
1da177e4 | 1074 | |
f2a762d8 BG |
1075 | ND_PRINTK(2, info, |
1076 | "RA: %s, dev: %s\n", | |
1077 | __func__, skb->dev->name); | |
0660e03f | 1078 | if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) { |
675418d5 | 1079 | ND_PRINTK(2, warn, "RA: source address is not link-local\n"); |
1da177e4 LT |
1080 | return; |
1081 | } | |
1082 | if (optlen < 0) { | |
675418d5 | 1083 | ND_PRINTK(2, warn, "RA: packet too short\n"); |
1da177e4 LT |
1084 | return; |
1085 | } | |
1086 | ||
de357cc0 | 1087 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 | 1088 | if (skb->ndisc_nodetype == NDISC_NODETYPE_HOST) { |
675418d5 | 1089 | ND_PRINTK(2, warn, "RA: from host or unauthorized router\n"); |
fadf6bf0 TF |
1090 | return; |
1091 | } | |
de357cc0 | 1092 | #endif |
fadf6bf0 | 1093 | |
1da177e4 LT |
1094 | /* |
1095 | * set the RA_RECV flag in the interface | |
1096 | */ | |
1097 | ||
cfdf7647 | 1098 | in6_dev = __in6_dev_get(skb->dev); |
1da177e4 | 1099 | if (in6_dev == NULL) { |
675418d5 JP |
1100 | ND_PRINTK(0, err, "RA: can't find inet6 device for %s\n", |
1101 | skb->dev->name); | |
1da177e4 LT |
1102 | return; |
1103 | } | |
1da177e4 LT |
1104 | |
1105 | if (!ndisc_parse_options(opt, optlen, &ndopts)) { | |
675418d5 | 1106 | ND_PRINTK(2, warn, "RA: invalid ND options\n"); |
1da177e4 LT |
1107 | return; |
1108 | } | |
1109 | ||
f2a762d8 BG |
1110 | if (!ipv6_accept_ra(in6_dev)) { |
1111 | ND_PRINTK(2, info, | |
1112 | "RA: %s, did not accept ra for dev: %s\n", | |
1113 | __func__, skb->dev->name); | |
31ce8c71 | 1114 | goto skip_linkparms; |
f2a762d8 | 1115 | } |
31ce8c71 | 1116 | |
de357cc0 | 1117 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 | 1118 | /* skip link-specific parameters from interior routers */ |
f2a762d8 BG |
1119 | if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT) { |
1120 | ND_PRINTK(2, info, | |
1121 | "RA: %s, nodetype is NODEFAULT, dev: %s\n", | |
1122 | __func__, skb->dev->name); | |
fadf6bf0 | 1123 | goto skip_linkparms; |
f2a762d8 | 1124 | } |
de357cc0 | 1125 | #endif |
fadf6bf0 | 1126 | |
1da177e4 LT |
1127 | if (in6_dev->if_flags & IF_RS_SENT) { |
1128 | /* | |
1129 | * flag that an RA was received after an RS was sent | |
1130 | * out on this interface. | |
1131 | */ | |
1132 | in6_dev->if_flags |= IF_RA_RCVD; | |
1133 | } | |
1134 | ||
1135 | /* | |
1136 | * Remember the managed/otherconf flags from most recently | |
1137 | * received RA message (RFC 2462) -- yoshfuji | |
1138 | */ | |
1139 | in6_dev->if_flags = (in6_dev->if_flags & ~(IF_RA_MANAGED | | |
1140 | IF_RA_OTHERCONF)) | | |
1141 | (ra_msg->icmph.icmp6_addrconf_managed ? | |
1142 | IF_RA_MANAGED : 0) | | |
1143 | (ra_msg->icmph.icmp6_addrconf_other ? | |
1144 | IF_RA_OTHERCONF : 0); | |
1145 | ||
f2a762d8 BG |
1146 | if (!in6_dev->cnf.accept_ra_defrtr) { |
1147 | ND_PRINTK(2, info, | |
1148 | "RA: %s, defrtr is false for dev: %s\n", | |
1149 | __func__, skb->dev->name); | |
65f5c7c1 | 1150 | goto skip_defrtr; |
f2a762d8 | 1151 | } |
65f5c7c1 | 1152 | |
d9333196 BG |
1153 | /* Do not accept RA with source-addr found on local machine unless |
1154 | * accept_ra_from_local is set to true. | |
1155 | */ | |
b6428817 LR |
1156 | if (!in6_dev->cnf.accept_ra_from_local && |
1157 | ipv6_chk_addr(dev_net(in6_dev->dev), &ipv6_hdr(skb)->saddr, | |
1158 | NULL, 0)) { | |
f2a762d8 | 1159 | ND_PRINTK(2, info, |
d9333196 BG |
1160 | "RA from local address detected on dev: %s: default router ignored\n", |
1161 | skb->dev->name); | |
9f56220f | 1162 | goto skip_defrtr; |
f2a762d8 | 1163 | } |
9f56220f | 1164 | |
1da177e4 LT |
1165 | lifetime = ntohs(ra_msg->icmph.icmp6_rt_lifetime); |
1166 | ||
ebacaaa0 YH |
1167 | #ifdef CONFIG_IPV6_ROUTER_PREF |
1168 | pref = ra_msg->icmph.icmp6_router_pref; | |
1169 | /* 10b is handled as if it were 00b (medium) */ | |
930d6ff2 | 1170 | if (pref == ICMPV6_ROUTER_PREF_INVALID || |
6d5b78cd | 1171 | !in6_dev->cnf.accept_ra_rtr_pref) |
ebacaaa0 YH |
1172 | pref = ICMPV6_ROUTER_PREF_MEDIUM; |
1173 | #endif | |
1174 | ||
0660e03f | 1175 | rt = rt6_get_dflt_router(&ipv6_hdr(skb)->saddr, skb->dev); |
1da177e4 | 1176 | |
eb857186 DM |
1177 | if (rt) { |
1178 | neigh = dst_neigh_lookup(&rt->dst, &ipv6_hdr(skb)->saddr); | |
1179 | if (!neigh) { | |
675418d5 JP |
1180 | ND_PRINTK(0, err, |
1181 | "RA: %s got default router without neighbour\n", | |
1182 | __func__); | |
94e187c0 | 1183 | ip6_rt_put(rt); |
eb857186 DM |
1184 | return; |
1185 | } | |
1186 | } | |
1da177e4 | 1187 | if (rt && lifetime == 0) { |
e0a1ad73 | 1188 | ip6_del_rt(rt); |
1da177e4 LT |
1189 | rt = NULL; |
1190 | } | |
1191 | ||
f2a762d8 BG |
1192 | ND_PRINTK(3, info, "RA: rt: %p lifetime: %d, for dev: %s\n", |
1193 | rt, lifetime, skb->dev->name); | |
1da177e4 | 1194 | if (rt == NULL && lifetime) { |
f2a762d8 | 1195 | ND_PRINTK(3, info, "RA: adding default router\n"); |
1da177e4 | 1196 | |
0660e03f | 1197 | rt = rt6_add_dflt_router(&ipv6_hdr(skb)->saddr, skb->dev, pref); |
1da177e4 | 1198 | if (rt == NULL) { |
675418d5 JP |
1199 | ND_PRINTK(0, err, |
1200 | "RA: %s failed to add default route\n", | |
1201 | __func__); | |
1da177e4 LT |
1202 | return; |
1203 | } | |
1204 | ||
eb857186 | 1205 | neigh = dst_neigh_lookup(&rt->dst, &ipv6_hdr(skb)->saddr); |
1da177e4 | 1206 | if (neigh == NULL) { |
675418d5 JP |
1207 | ND_PRINTK(0, err, |
1208 | "RA: %s got default router without neighbour\n", | |
1209 | __func__); | |
94e187c0 | 1210 | ip6_rt_put(rt); |
1da177e4 LT |
1211 | return; |
1212 | } | |
1213 | neigh->flags |= NTF_ROUTER; | |
ebacaaa0 | 1214 | } else if (rt) { |
22441cfa | 1215 | rt->rt6i_flags = (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); |
1da177e4 LT |
1216 | } |
1217 | ||
1218 | if (rt) | |
1716a961 | 1219 | rt6_set_expires(rt, jiffies + (HZ * lifetime)); |
1da177e4 LT |
1220 | if (ra_msg->icmph.icmp6_hop_limit) { |
1221 | in6_dev->cnf.hop_limit = ra_msg->icmph.icmp6_hop_limit; | |
1222 | if (rt) | |
defb3519 DM |
1223 | dst_metric_set(&rt->dst, RTAX_HOPLIMIT, |
1224 | ra_msg->icmph.icmp6_hop_limit); | |
1da177e4 LT |
1225 | } |
1226 | ||
65f5c7c1 YH |
1227 | skip_defrtr: |
1228 | ||
1da177e4 LT |
1229 | /* |
1230 | * Update Reachable Time and Retrans Timer | |
1231 | */ | |
1232 | ||
1233 | if (in6_dev->nd_parms) { | |
1234 | unsigned long rtime = ntohl(ra_msg->retrans_timer); | |
1235 | ||
1236 | if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/HZ) { | |
1237 | rtime = (rtime*HZ)/1000; | |
1238 | if (rtime < HZ/10) | |
1239 | rtime = HZ/10; | |
1f9248e5 | 1240 | NEIGH_VAR_SET(in6_dev->nd_parms, RETRANS_TIME, rtime); |
1da177e4 LT |
1241 | in6_dev->tstamp = jiffies; |
1242 | inet6_ifinfo_notify(RTM_NEWLINK, in6_dev); | |
1243 | } | |
1244 | ||
1245 | rtime = ntohl(ra_msg->reachable_time); | |
1246 | if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/(3*HZ)) { | |
1247 | rtime = (rtime*HZ)/1000; | |
1248 | ||
1249 | if (rtime < HZ/10) | |
1250 | rtime = HZ/10; | |
1251 | ||
1f9248e5 JP |
1252 | if (rtime != NEIGH_VAR(in6_dev->nd_parms, BASE_REACHABLE_TIME)) { |
1253 | NEIGH_VAR_SET(in6_dev->nd_parms, | |
1254 | BASE_REACHABLE_TIME, rtime); | |
1255 | NEIGH_VAR_SET(in6_dev->nd_parms, | |
1256 | GC_STALETIME, 3 * rtime); | |
1da177e4 LT |
1257 | in6_dev->nd_parms->reachable_time = neigh_rand_reach_time(rtime); |
1258 | in6_dev->tstamp = jiffies; | |
1259 | inet6_ifinfo_notify(RTM_NEWLINK, in6_dev); | |
1260 | } | |
1261 | } | |
1262 | } | |
1263 | ||
fadf6bf0 TF |
1264 | skip_linkparms: |
1265 | ||
1da177e4 LT |
1266 | /* |
1267 | * Process options. | |
1268 | */ | |
1269 | ||
1270 | if (!neigh) | |
0660e03f | 1271 | neigh = __neigh_lookup(&nd_tbl, &ipv6_hdr(skb)->saddr, |
1da177e4 LT |
1272 | skb->dev, 1); |
1273 | if (neigh) { | |
1274 | u8 *lladdr = NULL; | |
1275 | if (ndopts.nd_opts_src_lladdr) { | |
1276 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, | |
1277 | skb->dev); | |
1278 | if (!lladdr) { | |
675418d5 JP |
1279 | ND_PRINTK(2, warn, |
1280 | "RA: invalid link-layer address length\n"); | |
1da177e4 LT |
1281 | goto out; |
1282 | } | |
1283 | } | |
1284 | neigh_update(neigh, lladdr, NUD_STALE, | |
1285 | NEIGH_UPDATE_F_WEAK_OVERRIDE| | |
1286 | NEIGH_UPDATE_F_OVERRIDE| | |
1287 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
1288 | NEIGH_UPDATE_F_ISROUTER); | |
1289 | } | |
1290 | ||
f2a762d8 BG |
1291 | if (!ipv6_accept_ra(in6_dev)) { |
1292 | ND_PRINTK(2, info, | |
1293 | "RA: %s, accept_ra is false for dev: %s\n", | |
1294 | __func__, skb->dev->name); | |
31ce8c71 | 1295 | goto out; |
f2a762d8 | 1296 | } |
31ce8c71 | 1297 | |
70ceb4f5 | 1298 | #ifdef CONFIG_IPV6_ROUTE_INFO |
b6428817 LR |
1299 | if (!in6_dev->cnf.accept_ra_from_local && |
1300 | ipv6_chk_addr(dev_net(in6_dev->dev), &ipv6_hdr(skb)->saddr, | |
1301 | NULL, 0)) { | |
f2a762d8 | 1302 | ND_PRINTK(2, info, |
d9333196 BG |
1303 | "RA from local address detected on dev: %s: router info ignored.\n", |
1304 | skb->dev->name); | |
9f56220f | 1305 | goto skip_routeinfo; |
f2a762d8 | 1306 | } |
9f56220f | 1307 | |
09c884d4 | 1308 | if (in6_dev->cnf.accept_ra_rtr_pref && ndopts.nd_opts_ri) { |
70ceb4f5 YH |
1309 | struct nd_opt_hdr *p; |
1310 | for (p = ndopts.nd_opts_ri; | |
1311 | p; | |
1312 | p = ndisc_next_option(p, ndopts.nd_opts_ri_end)) { | |
6294e000 YH |
1313 | struct route_info *ri = (struct route_info *)p; |
1314 | #ifdef CONFIG_IPV6_NDISC_NODETYPE | |
1315 | if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT && | |
1316 | ri->prefix_len == 0) | |
1317 | continue; | |
1318 | #endif | |
30e56918 DJ |
1319 | if (ri->prefix_len == 0 && |
1320 | !in6_dev->cnf.accept_ra_defrtr) | |
1321 | continue; | |
6294e000 | 1322 | if (ri->prefix_len > in6_dev->cnf.accept_ra_rt_info_max_plen) |
09c884d4 | 1323 | continue; |
67ba4152 | 1324 | rt6_route_rcv(skb->dev, (u8 *)p, (p->nd_opt_len) << 3, |
0660e03f | 1325 | &ipv6_hdr(skb)->saddr); |
70ceb4f5 YH |
1326 | } |
1327 | } | |
9f56220f AH |
1328 | |
1329 | skip_routeinfo: | |
70ceb4f5 YH |
1330 | #endif |
1331 | ||
de357cc0 | 1332 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 | 1333 | /* skip link-specific ndopts from interior routers */ |
f2a762d8 BG |
1334 | if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT) { |
1335 | ND_PRINTK(2, info, | |
1336 | "RA: %s, nodetype is NODEFAULT (interior routes), dev: %s\n", | |
1337 | __func__, skb->dev->name); | |
fadf6bf0 | 1338 | goto out; |
f2a762d8 | 1339 | } |
de357cc0 | 1340 | #endif |
fadf6bf0 | 1341 | |
c4fd30eb | 1342 | if (in6_dev->cnf.accept_ra_pinfo && ndopts.nd_opts_pi) { |
1da177e4 LT |
1343 | struct nd_opt_hdr *p; |
1344 | for (p = ndopts.nd_opts_pi; | |
1345 | p; | |
1346 | p = ndisc_next_option(p, ndopts.nd_opts_pi_end)) { | |
e6bff995 NH |
1347 | addrconf_prefix_rcv(skb->dev, (u8 *)p, |
1348 | (p->nd_opt_len) << 3, | |
1349 | ndopts.nd_opts_src_lladdr != NULL); | |
1da177e4 LT |
1350 | } |
1351 | } | |
1352 | ||
c2943f14 | 1353 | if (ndopts.nd_opts_mtu && in6_dev->cnf.accept_ra_mtu) { |
e69a4adc | 1354 | __be32 n; |
1da177e4 LT |
1355 | u32 mtu; |
1356 | ||
67ba4152 | 1357 | memcpy(&n, ((u8 *)(ndopts.nd_opts_mtu+1))+2, sizeof(mtu)); |
e69a4adc | 1358 | mtu = ntohl(n); |
1da177e4 LT |
1359 | |
1360 | if (mtu < IPV6_MIN_MTU || mtu > skb->dev->mtu) { | |
675418d5 | 1361 | ND_PRINTK(2, warn, "RA: invalid mtu: %d\n", mtu); |
1da177e4 LT |
1362 | } else if (in6_dev->cnf.mtu6 != mtu) { |
1363 | in6_dev->cnf.mtu6 = mtu; | |
1364 | ||
1365 | if (rt) | |
defb3519 | 1366 | dst_metric_set(&rt->dst, RTAX_MTU, mtu); |
1da177e4 LT |
1367 | |
1368 | rt6_mtu_change(skb->dev, mtu); | |
1369 | } | |
1370 | } | |
1ab1457c | 1371 | |
31910575 | 1372 | if (ndopts.nd_useropts) { |
61cf46ad YH |
1373 | struct nd_opt_hdr *p; |
1374 | for (p = ndopts.nd_useropts; | |
1375 | p; | |
1376 | p = ndisc_next_useropt(p, ndopts.nd_useropts_end)) { | |
1377 | ndisc_ra_useropt(skb, p); | |
31910575 PY |
1378 | } |
1379 | } | |
1380 | ||
1da177e4 | 1381 | if (ndopts.nd_opts_tgt_lladdr || ndopts.nd_opts_rh) { |
675418d5 | 1382 | ND_PRINTK(2, warn, "RA: invalid RA options\n"); |
1da177e4 LT |
1383 | } |
1384 | out: | |
94e187c0 | 1385 | ip6_rt_put(rt); |
eb857186 | 1386 | if (neigh) |
1da177e4 | 1387 | neigh_release(neigh); |
1da177e4 LT |
1388 | } |
1389 | ||
1390 | static void ndisc_redirect_rcv(struct sk_buff *skb) | |
1391 | { | |
093d04d4 DJ |
1392 | u8 *hdr; |
1393 | struct ndisc_options ndopts; | |
1394 | struct rd_msg *msg = (struct rd_msg *)skb_transport_header(skb); | |
29a3cad5 | 1395 | u32 ndoptlen = skb_tail_pointer(skb) - (skb_transport_header(skb) + |
093d04d4 DJ |
1396 | offsetof(struct rd_msg, opt)); |
1397 | ||
de357cc0 | 1398 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 TF |
1399 | switch (skb->ndisc_nodetype) { |
1400 | case NDISC_NODETYPE_HOST: | |
1401 | case NDISC_NODETYPE_NODEFAULT: | |
675418d5 JP |
1402 | ND_PRINTK(2, warn, |
1403 | "Redirect: from host or unauthorized router\n"); | |
fadf6bf0 TF |
1404 | return; |
1405 | } | |
de357cc0 | 1406 | #endif |
fadf6bf0 | 1407 | |
0660e03f | 1408 | if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) { |
675418d5 JP |
1409 | ND_PRINTK(2, warn, |
1410 | "Redirect: source address is not link-local\n"); | |
1da177e4 LT |
1411 | return; |
1412 | } | |
1413 | ||
093d04d4 DJ |
1414 | if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) |
1415 | return; | |
1416 | ||
c92a59ec | 1417 | if (!ndopts.nd_opts_rh) { |
b55b76b2 DJ |
1418 | ip6_redirect_no_header(skb, dev_net(skb->dev), |
1419 | skb->dev->ifindex, 0); | |
093d04d4 | 1420 | return; |
c92a59ec | 1421 | } |
093d04d4 DJ |
1422 | |
1423 | hdr = (u8 *)ndopts.nd_opts_rh; | |
1424 | hdr += 8; | |
1425 | if (!pskb_pull(skb, hdr - skb_transport_header(skb))) | |
1426 | return; | |
1427 | ||
b94f1c09 | 1428 | icmpv6_notify(skb, NDISC_REDIRECT, 0, 0); |
1da177e4 LT |
1429 | } |
1430 | ||
5f5a0115 YH |
1431 | static void ndisc_fill_redirect_hdr_option(struct sk_buff *skb, |
1432 | struct sk_buff *orig_skb, | |
1433 | int rd_len) | |
9c86dafe | 1434 | { |
5f5a0115 YH |
1435 | u8 *opt = skb_put(skb, rd_len); |
1436 | ||
9c86dafe YH |
1437 | memset(opt, 0, 8); |
1438 | *(opt++) = ND_OPT_REDIRECT_HDR; | |
1439 | *(opt++) = (rd_len >> 3); | |
1440 | opt += 6; | |
1441 | ||
1442 | memcpy(opt, ipv6_hdr(orig_skb), rd_len - 8); | |
9c86dafe YH |
1443 | } |
1444 | ||
4991969a | 1445 | void ndisc_send_redirect(struct sk_buff *skb, const struct in6_addr *target) |
1da177e4 | 1446 | { |
1762f7e8 | 1447 | struct net_device *dev = skb->dev; |
c346dca1 | 1448 | struct net *net = dev_net(dev); |
1762f7e8 | 1449 | struct sock *sk = net->ipv6.ndisc_sk; |
2ce13576 | 1450 | int optlen = 0; |
fbfe95a4 | 1451 | struct inet_peer *peer; |
1da177e4 | 1452 | struct sk_buff *buff; |
71bcdba0 | 1453 | struct rd_msg *msg; |
1da177e4 | 1454 | struct in6_addr saddr_buf; |
1da177e4 LT |
1455 | struct rt6_info *rt; |
1456 | struct dst_entry *dst; | |
4c9483b2 | 1457 | struct flowi6 fl6; |
1da177e4 | 1458 | int rd_len; |
1da177e4 | 1459 | u8 ha_buf[MAX_ADDR_LEN], *ha = NULL; |
1d861aa4 | 1460 | bool ret; |
1da177e4 | 1461 | |
95c385b4 | 1462 | if (ipv6_get_lladdr(dev, &saddr_buf, IFA_F_TENTATIVE)) { |
675418d5 JP |
1463 | ND_PRINTK(2, warn, "Redirect: no link-local address on %s\n", |
1464 | dev->name); | |
1ab1457c YH |
1465 | return; |
1466 | } | |
1da177e4 | 1467 | |
0660e03f | 1468 | if (!ipv6_addr_equal(&ipv6_hdr(skb)->daddr, target) && |
bf0b48df | 1469 | ipv6_addr_type(target) != (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) { |
675418d5 JP |
1470 | ND_PRINTK(2, warn, |
1471 | "Redirect: target address is not link-local unicast\n"); | |
29556526 LY |
1472 | return; |
1473 | } | |
1474 | ||
4c9483b2 | 1475 | icmpv6_flow_init(sk, &fl6, NDISC_REDIRECT, |
95e41e93 | 1476 | &saddr_buf, &ipv6_hdr(skb)->saddr, dev->ifindex); |
1da177e4 | 1477 | |
4c9483b2 | 1478 | dst = ip6_route_output(net, NULL, &fl6); |
5095d64d RL |
1479 | if (dst->error) { |
1480 | dst_release(dst); | |
1da177e4 | 1481 | return; |
5095d64d | 1482 | } |
4c9483b2 | 1483 | dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), NULL, 0); |
452edd59 | 1484 | if (IS_ERR(dst)) |
1da177e4 | 1485 | return; |
1da177e4 LT |
1486 | |
1487 | rt = (struct rt6_info *) dst; | |
1488 | ||
1489 | if (rt->rt6i_flags & RTF_GATEWAY) { | |
675418d5 JP |
1490 | ND_PRINTK(2, warn, |
1491 | "Redirect: destination is not a neighbour\n"); | |
d73f0801 | 1492 | goto release; |
1da177e4 | 1493 | } |
1d861aa4 DM |
1494 | peer = inet_getpeer_v6(net->ipv6.peers, &rt->rt6i_dst.addr, 1); |
1495 | ret = inet_peer_xrlim_allow(peer, 1*HZ); | |
1496 | if (peer) | |
1497 | inet_putpeer(peer); | |
1498 | if (!ret) | |
d73f0801 | 1499 | goto release; |
1da177e4 LT |
1500 | |
1501 | if (dev->addr_len) { | |
4991969a DM |
1502 | struct neighbour *neigh = dst_neigh_lookup(skb_dst(skb), target); |
1503 | if (!neigh) { | |
675418d5 JP |
1504 | ND_PRINTK(2, warn, |
1505 | "Redirect: no neigh for target address\n"); | |
4991969a DM |
1506 | goto release; |
1507 | } | |
1508 | ||
1da177e4 LT |
1509 | read_lock_bh(&neigh->lock); |
1510 | if (neigh->nud_state & NUD_VALID) { | |
1511 | memcpy(ha_buf, neigh->ha, dev->addr_len); | |
1512 | read_unlock_bh(&neigh->lock); | |
1513 | ha = ha_buf; | |
2ce13576 | 1514 | optlen += ndisc_opt_addr_space(dev); |
1da177e4 LT |
1515 | } else |
1516 | read_unlock_bh(&neigh->lock); | |
4991969a DM |
1517 | |
1518 | neigh_release(neigh); | |
1da177e4 LT |
1519 | } |
1520 | ||
1521 | rd_len = min_t(unsigned int, | |
2ce13576 YH |
1522 | IPV6_MIN_MTU - sizeof(struct ipv6hdr) - sizeof(*msg) - optlen, |
1523 | skb->len + 8); | |
1da177e4 | 1524 | rd_len &= ~0x7; |
2ce13576 | 1525 | optlen += rd_len; |
1da177e4 | 1526 | |
2ce13576 | 1527 | buff = ndisc_alloc_skb(dev, sizeof(*msg) + optlen); |
de09334b | 1528 | if (!buff) |
d73f0801 | 1529 | goto release; |
1da177e4 | 1530 | |
4d5c152e YH |
1531 | msg = (struct rd_msg *)skb_put(buff, sizeof(*msg)); |
1532 | *msg = (struct rd_msg) { | |
1533 | .icmph = { | |
1534 | .icmp6_type = NDISC_REDIRECT, | |
1535 | }, | |
1536 | .target = *target, | |
1537 | .dest = ipv6_hdr(skb)->daddr, | |
1538 | }; | |
1da177e4 | 1539 | |
1da177e4 LT |
1540 | /* |
1541 | * include target_address option | |
1542 | */ | |
1543 | ||
1544 | if (ha) | |
33be081a | 1545 | ndisc_fill_addr_option(buff, ND_OPT_TARGET_LL_ADDR, ha); |
1da177e4 LT |
1546 | |
1547 | /* | |
1548 | * build redirect option and copy skb over to the new packet. | |
1549 | */ | |
1550 | ||
9c86dafe | 1551 | if (rd_len) |
5f5a0115 | 1552 | ndisc_fill_redirect_hdr_option(buff, skb, rd_len); |
1da177e4 | 1553 | |
adf30907 | 1554 | skb_dst_set(buff, dst); |
f4de84c6 | 1555 | ndisc_send_skb(buff, &ipv6_hdr(skb)->saddr, &saddr_buf); |
d73f0801 IJ |
1556 | return; |
1557 | ||
1558 | release: | |
1559 | dst_release(dst); | |
1da177e4 LT |
1560 | } |
1561 | ||
1562 | static void pndisc_redo(struct sk_buff *skb) | |
1563 | { | |
140e26fc | 1564 | ndisc_recv_ns(skb); |
1da177e4 LT |
1565 | kfree_skb(skb); |
1566 | } | |
1567 | ||
b800c3b9 HFS |
1568 | static bool ndisc_suppress_frag_ndisc(struct sk_buff *skb) |
1569 | { | |
1570 | struct inet6_dev *idev = __in6_dev_get(skb->dev); | |
1571 | ||
1572 | if (!idev) | |
1573 | return true; | |
1574 | if (IP6CB(skb)->flags & IP6SKB_FRAGMENTED && | |
1575 | idev->cnf.suppress_frag_ndisc) { | |
1576 | net_warn_ratelimited("Received fragmented ndisc packet. Carefully consider disabling suppress_frag_ndisc.\n"); | |
1577 | return true; | |
1578 | } | |
1579 | return false; | |
1580 | } | |
1581 | ||
1da177e4 LT |
1582 | int ndisc_rcv(struct sk_buff *skb) |
1583 | { | |
1584 | struct nd_msg *msg; | |
1585 | ||
b800c3b9 HFS |
1586 | if (ndisc_suppress_frag_ndisc(skb)) |
1587 | return 0; | |
1588 | ||
6bce6b4e | 1589 | if (skb_linearize(skb)) |
1da177e4 LT |
1590 | return 0; |
1591 | ||
9c70220b | 1592 | msg = (struct nd_msg *)skb_transport_header(skb); |
1da177e4 | 1593 | |
9c70220b | 1594 | __skb_push(skb, skb->data - skb_transport_header(skb)); |
1da177e4 | 1595 | |
0660e03f | 1596 | if (ipv6_hdr(skb)->hop_limit != 255) { |
675418d5 JP |
1597 | ND_PRINTK(2, warn, "NDISC: invalid hop-limit: %d\n", |
1598 | ipv6_hdr(skb)->hop_limit); | |
1da177e4 LT |
1599 | return 0; |
1600 | } | |
1601 | ||
1602 | if (msg->icmph.icmp6_code != 0) { | |
675418d5 JP |
1603 | ND_PRINTK(2, warn, "NDISC: invalid ICMPv6 code: %d\n", |
1604 | msg->icmph.icmp6_code); | |
1da177e4 LT |
1605 | return 0; |
1606 | } | |
1607 | ||
a61bbcf2 PM |
1608 | memset(NEIGH_CB(skb), 0, sizeof(struct neighbour_cb)); |
1609 | ||
1da177e4 LT |
1610 | switch (msg->icmph.icmp6_type) { |
1611 | case NDISC_NEIGHBOUR_SOLICITATION: | |
1612 | ndisc_recv_ns(skb); | |
1613 | break; | |
1614 | ||
1615 | case NDISC_NEIGHBOUR_ADVERTISEMENT: | |
1616 | ndisc_recv_na(skb); | |
1617 | break; | |
1618 | ||
1619 | case NDISC_ROUTER_SOLICITATION: | |
1620 | ndisc_recv_rs(skb); | |
1621 | break; | |
1622 | ||
1623 | case NDISC_ROUTER_ADVERTISEMENT: | |
1624 | ndisc_router_discovery(skb); | |
1625 | break; | |
1626 | ||
1627 | case NDISC_REDIRECT: | |
1628 | ndisc_redirect_rcv(skb); | |
1629 | break; | |
3ff50b79 | 1630 | } |
1da177e4 LT |
1631 | |
1632 | return 0; | |
1633 | } | |
1634 | ||
1635 | static int ndisc_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1636 | { | |
351638e7 | 1637 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
c346dca1 | 1638 | struct net *net = dev_net(dev); |
5cb04436 | 1639 | struct inet6_dev *idev; |
1da177e4 LT |
1640 | |
1641 | switch (event) { | |
1642 | case NETDEV_CHANGEADDR: | |
1643 | neigh_changeaddr(&nd_tbl, dev); | |
2ac3ac8f | 1644 | fib6_run_gc(0, net, false); |
5cb04436 HFS |
1645 | idev = in6_dev_get(dev); |
1646 | if (!idev) | |
1647 | break; | |
1648 | if (idev->cnf.ndisc_notify) | |
1649 | ndisc_send_unsol_na(dev); | |
1650 | in6_dev_put(idev); | |
1da177e4 LT |
1651 | break; |
1652 | case NETDEV_DOWN: | |
1653 | neigh_ifdown(&nd_tbl, dev); | |
2ac3ac8f | 1654 | fib6_run_gc(0, net, false); |
1da177e4 | 1655 | break; |
f47b9464 BH |
1656 | case NETDEV_NOTIFY_PEERS: |
1657 | ndisc_send_unsol_na(dev); | |
1658 | break; | |
1da177e4 LT |
1659 | default: |
1660 | break; | |
1661 | } | |
1662 | ||
1663 | return NOTIFY_DONE; | |
1664 | } | |
1665 | ||
1666 | static struct notifier_block ndisc_netdev_notifier = { | |
1667 | .notifier_call = ndisc_netdev_event, | |
1668 | }; | |
1669 | ||
1670 | #ifdef CONFIG_SYSCTL | |
1671 | static void ndisc_warn_deprecated_sysctl(struct ctl_table *ctl, | |
1672 | const char *func, const char *dev_name) | |
1673 | { | |
1674 | static char warncomm[TASK_COMM_LEN]; | |
1675 | static int warned; | |
1676 | if (strcmp(warncomm, current->comm) && warned < 5) { | |
1677 | strcpy(warncomm, current->comm); | |
f3213831 | 1678 | 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 |
1679 | warncomm, func, |
1680 | dev_name, ctl->procname, | |
1681 | dev_name, ctl->procname); | |
1682 | warned++; | |
1683 | } | |
1684 | } | |
1685 | ||
8d65af78 | 1686 | int ndisc_ifinfo_sysctl_change(struct ctl_table *ctl, int write, void __user *buffer, size_t *lenp, loff_t *ppos) |
1da177e4 LT |
1687 | { |
1688 | struct net_device *dev = ctl->extra1; | |
1689 | struct inet6_dev *idev; | |
1690 | int ret; | |
1691 | ||
d12af679 EB |
1692 | if ((strcmp(ctl->procname, "retrans_time") == 0) || |
1693 | (strcmp(ctl->procname, "base_reachable_time") == 0)) | |
1da177e4 LT |
1694 | ndisc_warn_deprecated_sysctl(ctl, "syscall", dev ? dev->name : "default"); |
1695 | ||
d12af679 | 1696 | if (strcmp(ctl->procname, "retrans_time") == 0) |
cb5b09c1 | 1697 | ret = neigh_proc_dointvec(ctl, write, buffer, lenp, ppos); |
d12af679 EB |
1698 | |
1699 | else if (strcmp(ctl->procname, "base_reachable_time") == 0) | |
cb5b09c1 JP |
1700 | ret = neigh_proc_dointvec_jiffies(ctl, write, |
1701 | buffer, lenp, ppos); | |
d12af679 EB |
1702 | |
1703 | else if ((strcmp(ctl->procname, "retrans_time_ms") == 0) || | |
ad02ac14 | 1704 | (strcmp(ctl->procname, "base_reachable_time_ms") == 0)) |
cb5b09c1 JP |
1705 | ret = neigh_proc_dointvec_ms_jiffies(ctl, write, |
1706 | buffer, lenp, ppos); | |
d12af679 | 1707 | else |
1da177e4 | 1708 | ret = -1; |
1da177e4 LT |
1709 | |
1710 | if (write && ret == 0 && dev && (idev = in6_dev_get(dev)) != NULL) { | |
1f9248e5 JP |
1711 | if (ctl->data == &NEIGH_VAR(idev->nd_parms, BASE_REACHABLE_TIME)) |
1712 | idev->nd_parms->reachable_time = | |
1713 | neigh_rand_reach_time(NEIGH_VAR(idev->nd_parms, BASE_REACHABLE_TIME)); | |
1da177e4 LT |
1714 | idev->tstamp = jiffies; |
1715 | inet6_ifinfo_notify(RTM_NEWLINK, idev); | |
1716 | in6_dev_put(idev); | |
1717 | } | |
1718 | return ret; | |
1719 | } | |
1720 | ||
1da177e4 LT |
1721 | |
1722 | #endif | |
1723 | ||
2c8c1e72 | 1724 | static int __net_init ndisc_net_init(struct net *net) |
1da177e4 LT |
1725 | { |
1726 | struct ipv6_pinfo *np; | |
1727 | struct sock *sk; | |
1ab1457c | 1728 | int err; |
1da177e4 | 1729 | |
1ed8516f DL |
1730 | err = inet_ctl_sock_create(&sk, PF_INET6, |
1731 | SOCK_RAW, IPPROTO_ICMPV6, net); | |
1da177e4 | 1732 | if (err < 0) { |
675418d5 JP |
1733 | ND_PRINTK(0, err, |
1734 | "NDISC: Failed to initialize the control socket (err %d)\n", | |
1735 | err); | |
1da177e4 LT |
1736 | return err; |
1737 | } | |
1738 | ||
1ed8516f | 1739 | net->ipv6.ndisc_sk = sk; |
1762f7e8 | 1740 | |
1da177e4 | 1741 | np = inet6_sk(sk); |
1da177e4 LT |
1742 | np->hop_limit = 255; |
1743 | /* Do not loopback ndisc messages */ | |
1744 | np->mc_loop = 0; | |
1da177e4 | 1745 | |
1762f7e8 DL |
1746 | return 0; |
1747 | } | |
1748 | ||
2c8c1e72 | 1749 | static void __net_exit ndisc_net_exit(struct net *net) |
1762f7e8 | 1750 | { |
1ed8516f | 1751 | inet_ctl_sock_destroy(net->ipv6.ndisc_sk); |
1762f7e8 DL |
1752 | } |
1753 | ||
1754 | static struct pernet_operations ndisc_net_ops = { | |
1755 | .init = ndisc_net_init, | |
1756 | .exit = ndisc_net_exit, | |
1757 | }; | |
1758 | ||
1759 | int __init ndisc_init(void) | |
1760 | { | |
1761 | int err; | |
1762 | ||
1763 | err = register_pernet_subsys(&ndisc_net_ops); | |
1764 | if (err) | |
1765 | return err; | |
1ab1457c YH |
1766 | /* |
1767 | * Initialize the neighbour table | |
1768 | */ | |
d7480fd3 | 1769 | neigh_table_init(NEIGH_ND_TABLE, &nd_tbl); |
1da177e4 LT |
1770 | |
1771 | #ifdef CONFIG_SYSCTL | |
73af614a | 1772 | err = neigh_sysctl_register(NULL, &nd_tbl.parms, |
56ec0fb1 | 1773 | ndisc_ifinfo_sysctl_change); |
1762f7e8 DL |
1774 | if (err) |
1775 | goto out_unregister_pernet; | |
1762f7e8 | 1776 | out: |
bcd081a3 | 1777 | #endif |
1762f7e8 | 1778 | return err; |
1da177e4 | 1779 | |
1762f7e8 | 1780 | #ifdef CONFIG_SYSCTL |
1762f7e8 | 1781 | out_unregister_pernet: |
1762f7e8 DL |
1782 | unregister_pernet_subsys(&ndisc_net_ops); |
1783 | goto out; | |
2c861cc6 | 1784 | #endif |
1da177e4 LT |
1785 | } |
1786 | ||
2c861cc6 MK |
1787 | int __init ndisc_late_init(void) |
1788 | { | |
1789 | return register_netdevice_notifier(&ndisc_netdev_notifier); | |
1790 | } | |
1791 | ||
1792 | void ndisc_late_cleanup(void) | |
1da177e4 | 1793 | { |
36f73d0c | 1794 | unregister_netdevice_notifier(&ndisc_netdev_notifier); |
2c861cc6 MK |
1795 | } |
1796 | ||
1797 | void ndisc_cleanup(void) | |
1798 | { | |
1da177e4 LT |
1799 | #ifdef CONFIG_SYSCTL |
1800 | neigh_sysctl_unregister(&nd_tbl.parms); | |
1801 | #endif | |
d7480fd3 | 1802 | neigh_table_clear(NEIGH_ND_TABLE, &nd_tbl); |
1762f7e8 | 1803 | unregister_pernet_subsys(&ndisc_net_ops); |
1da177e4 | 1804 | } |