Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Neighbour Discovery for IPv6 | |
1ab1457c | 3 | * Linux INET6 implementation |
1da177e4 LT |
4 | * |
5 | * Authors: | |
1ab1457c | 6 | * Pedro Roque <roque@di.fc.ul.pt> |
1da177e4 LT |
7 | * Mike Shaver <shaver@ingenia.com> |
8 | * | |
9 | * This program is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU General Public License | |
11 | * as published by the Free Software Foundation; either version | |
12 | * 2 of the License, or (at your option) any later version. | |
13 | */ | |
14 | ||
15 | /* | |
16 | * Changes: | |
17 | * | |
e35f30c1 | 18 | * Alexey I. Froloff : RFC6106 (DNSSL) support |
31910575 PY |
19 | * Pierre Ynard : export userland ND options |
20 | * through netlink (RDNSS support) | |
1da177e4 LT |
21 | * Lars Fenneberg : fixed MTU setting on receipt |
22 | * of an RA. | |
1da177e4 LT |
23 | * Janos Farkas : kmalloc failure checks |
24 | * Alexey Kuznetsov : state machine reworked | |
25 | * and moved to net/core. | |
26 | * Pekka Savola : RFC2461 validation | |
27 | * YOSHIFUJI Hideaki @USAGI : Verify ND options properly | |
28 | */ | |
29 | ||
675418d5 | 30 | #define pr_fmt(fmt) "ICMPv6: " fmt |
1da177e4 LT |
31 | |
32 | #include <linux/module.h> | |
1da177e4 LT |
33 | #include <linux/errno.h> |
34 | #include <linux/types.h> | |
35 | #include <linux/socket.h> | |
36 | #include <linux/sockios.h> | |
37 | #include <linux/sched.h> | |
38 | #include <linux/net.h> | |
39 | #include <linux/in6.h> | |
40 | #include <linux/route.h> | |
41 | #include <linux/init.h> | |
42 | #include <linux/rcupdate.h> | |
5a0e3ad6 | 43 | #include <linux/slab.h> |
1da177e4 LT |
44 | #ifdef CONFIG_SYSCTL |
45 | #include <linux/sysctl.h> | |
46 | #endif | |
47 | ||
1823730f | 48 | #include <linux/if_addr.h> |
1da177e4 LT |
49 | #include <linux/if_arp.h> |
50 | #include <linux/ipv6.h> | |
51 | #include <linux/icmpv6.h> | |
52 | #include <linux/jhash.h> | |
53 | ||
54 | #include <net/sock.h> | |
55 | #include <net/snmp.h> | |
56 | ||
57 | #include <net/ipv6.h> | |
58 | #include <net/protocol.h> | |
59 | #include <net/ndisc.h> | |
60 | #include <net/ip6_route.h> | |
61 | #include <net/addrconf.h> | |
62 | #include <net/icmp.h> | |
63 | ||
31910575 PY |
64 | #include <net/netlink.h> |
65 | #include <linux/rtnetlink.h> | |
66 | ||
1da177e4 LT |
67 | #include <net/flow.h> |
68 | #include <net/ip6_checksum.h> | |
1ed8516f | 69 | #include <net/inet_common.h> |
1da177e4 LT |
70 | #include <linux/proc_fs.h> |
71 | ||
72 | #include <linux/netfilter.h> | |
73 | #include <linux/netfilter_ipv6.h> | |
74 | ||
675418d5 JP |
75 | /* Set to 3 to get tracing... */ |
76 | #define ND_DEBUG 1 | |
77 | ||
78 | #define ND_PRINTK(val, level, fmt, ...) \ | |
79 | do { \ | |
80 | if (val <= ND_DEBUG) \ | |
81 | net_##level##_ratelimited(fmt, ##__VA_ARGS__); \ | |
82 | } while (0) | |
83 | ||
d6bf7817 ED |
84 | static u32 ndisc_hash(const void *pkey, |
85 | const struct net_device *dev, | |
2c2aba6c | 86 | __u32 *hash_rnd); |
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 | |
29a26a56 EB |
466 | err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, |
467 | net, sk, skb, NULL, dst->dev, | |
13206b6b | 468 | dst_output); |
1da177e4 | 469 | if (!err) { |
5c5d244b | 470 | ICMP6MSGOUT_INC_STATS(net, idev, type); |
a862f6a6 | 471 | ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); |
1da177e4 LT |
472 | } |
473 | ||
cfdf7647 | 474 | rcu_read_unlock(); |
1ab1457c | 475 | } |
1da177e4 | 476 | |
38cf595b | 477 | void ndisc_send_na(struct net_device *dev, const struct in6_addr *daddr, |
f564f45c CW |
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) { | |
38cf595b | 543 | ndisc_send_na(dev, &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 | ||
38cf595b | 553 | void ndisc_send_ns(struct net_device *dev, const struct in6_addr *solicit, |
ab450605 JB |
554 | const struct in6_addr *daddr, const struct in6_addr *saddr, |
555 | struct sk_buff *oskb) | |
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 | ||
ab450605 JB |
591 | if (!(dev->priv_flags & IFF_XMIT_DST_RELEASE) && oskb) |
592 | skb_dst_copy(skb, oskb); | |
593 | ||
b44b5f4a | 594 | ndisc_send_skb(skb, daddr, saddr); |
1da177e4 LT |
595 | } |
596 | ||
9acd9f3a YH |
597 | void ndisc_send_rs(struct net_device *dev, const struct in6_addr *saddr, |
598 | const struct in6_addr *daddr) | |
1da177e4 | 599 | { |
b44b5f4a | 600 | struct sk_buff *skb; |
1cb3fe51 | 601 | struct rs_msg *msg; |
95c385b4 | 602 | int send_sllao = dev->addr_len; |
1cb3fe51 | 603 | int optlen = 0; |
95c385b4 NH |
604 | |
605 | #ifdef CONFIG_IPV6_OPTIMISTIC_DAD | |
606 | /* | |
607 | * According to section 2.2 of RFC 4429, we must not | |
608 | * send router solicitations with a sllao from | |
609 | * optimistic addresses, but we may send the solicitation | |
610 | * if we don't include the sllao. So here we check | |
611 | * if our address is optimistic, and if so, we | |
bea85195 | 612 | * suppress the inclusion of the sllao. |
95c385b4 NH |
613 | */ |
614 | if (send_sllao) { | |
c346dca1 | 615 | struct inet6_ifaddr *ifp = ipv6_get_ifaddr(dev_net(dev), saddr, |
1cab3da6 | 616 | dev, 1); |
95c385b4 NH |
617 | if (ifp) { |
618 | if (ifp->flags & IFA_F_OPTIMISTIC) { | |
ca043569 | 619 | send_sllao = 0; |
95c385b4 | 620 | } |
ca043569 | 621 | in6_ifa_put(ifp); |
95c385b4 NH |
622 | } else { |
623 | send_sllao = 0; | |
624 | } | |
625 | } | |
626 | #endif | |
1cb3fe51 YH |
627 | if (send_sllao) |
628 | optlen += ndisc_opt_addr_space(dev); | |
629 | ||
630 | skb = ndisc_alloc_skb(dev, sizeof(*msg) + optlen); | |
b44b5f4a YH |
631 | if (!skb) |
632 | return; | |
633 | ||
1cb3fe51 YH |
634 | msg = (struct rs_msg *)skb_put(skb, sizeof(*msg)); |
635 | *msg = (struct rs_msg) { | |
636 | .icmph = { | |
637 | .icmp6_type = NDISC_ROUTER_SOLICITATION, | |
638 | }, | |
639 | }; | |
640 | ||
641 | if (send_sllao) | |
642 | ndisc_fill_addr_option(skb, ND_OPT_SOURCE_LL_ADDR, | |
643 | dev->dev_addr); | |
644 | ||
b44b5f4a | 645 | ndisc_send_skb(skb, daddr, saddr); |
1da177e4 | 646 | } |
1ab1457c | 647 | |
1da177e4 LT |
648 | |
649 | static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb) | |
650 | { | |
651 | /* | |
652 | * "The sender MUST return an ICMP | |
653 | * destination unreachable" | |
654 | */ | |
655 | dst_link_failure(skb); | |
656 | kfree_skb(skb); | |
657 | } | |
658 | ||
659 | /* Called with locked neigh: either read or both */ | |
660 | ||
661 | static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb) | |
662 | { | |
663 | struct in6_addr *saddr = NULL; | |
664 | struct in6_addr mcaddr; | |
665 | struct net_device *dev = neigh->dev; | |
666 | struct in6_addr *target = (struct in6_addr *)&neigh->primary_key; | |
667 | int probes = atomic_read(&neigh->probes); | |
668 | ||
c58da4c6 EK |
669 | if (skb && ipv6_chk_addr_and_flags(dev_net(dev), &ipv6_hdr(skb)->saddr, |
670 | dev, 1, | |
671 | IFA_F_TENTATIVE|IFA_F_OPTIMISTIC)) | |
0660e03f | 672 | saddr = &ipv6_hdr(skb)->saddr; |
e5d08d71 IM |
673 | probes -= NEIGH_VAR(neigh->parms, UCAST_PROBES); |
674 | if (probes < 0) { | |
1da177e4 | 675 | if (!(neigh->nud_state & NUD_VALID)) { |
675418d5 JP |
676 | ND_PRINTK(1, dbg, |
677 | "%s: trying to ucast probe in NUD_INVALID: %pI6\n", | |
678 | __func__, target); | |
1da177e4 | 679 | } |
38cf595b | 680 | ndisc_send_ns(dev, target, target, saddr, skb); |
1f9248e5 | 681 | } else if ((probes -= NEIGH_VAR(neigh->parms, APP_PROBES)) < 0) { |
1da177e4 | 682 | neigh_app_ns(neigh); |
1da177e4 LT |
683 | } else { |
684 | addrconf_addr_solict_mult(target, &mcaddr); | |
38cf595b | 685 | ndisc_send_ns(dev, target, &mcaddr, saddr, skb); |
1da177e4 LT |
686 | } |
687 | } | |
688 | ||
0736ffc0 YH |
689 | static int pndisc_is_router(const void *pkey, |
690 | struct net_device *dev) | |
fa86d322 PE |
691 | { |
692 | struct pneigh_entry *n; | |
0736ffc0 | 693 | int ret = -1; |
fa86d322 PE |
694 | |
695 | read_lock_bh(&nd_tbl.lock); | |
0736ffc0 YH |
696 | n = __pneigh_lookup(&nd_tbl, dev_net(dev), pkey, dev); |
697 | if (n) | |
698 | ret = !!(n->flags & NTF_ROUTER); | |
fa86d322 PE |
699 | read_unlock_bh(&nd_tbl.lock); |
700 | ||
0736ffc0 | 701 | return ret; |
fa86d322 PE |
702 | } |
703 | ||
1da177e4 LT |
704 | static void ndisc_recv_ns(struct sk_buff *skb) |
705 | { | |
9c70220b | 706 | struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb); |
b71d1d42 ED |
707 | const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; |
708 | const struct in6_addr *daddr = &ipv6_hdr(skb)->daddr; | |
1da177e4 | 709 | u8 *lladdr = NULL; |
29a3cad5 | 710 | u32 ndoptlen = skb_tail_pointer(skb) - (skb_transport_header(skb) + |
27a884dc | 711 | offsetof(struct nd_msg, opt)); |
1da177e4 LT |
712 | struct ndisc_options ndopts; |
713 | struct net_device *dev = skb->dev; | |
714 | struct inet6_ifaddr *ifp; | |
715 | struct inet6_dev *idev = NULL; | |
716 | struct neighbour *neigh; | |
717 | int dad = ipv6_addr_any(saddr); | |
a50feda5 | 718 | bool inc; |
0736ffc0 | 719 | int is_router = -1; |
1da177e4 | 720 | |
115b0aa6 YH |
721 | if (skb->len < sizeof(struct nd_msg)) { |
722 | ND_PRINTK(2, warn, "NS: packet too short\n"); | |
723 | return; | |
724 | } | |
725 | ||
1da177e4 | 726 | if (ipv6_addr_is_multicast(&msg->target)) { |
675418d5 | 727 | ND_PRINTK(2, warn, "NS: multicast target address\n"); |
1da177e4 LT |
728 | return; |
729 | } | |
730 | ||
731 | /* | |
732 | * RFC2461 7.1.1: | |
733 | * DAD has to be destined for solicited node multicast address. | |
734 | */ | |
ca97a644 | 735 | if (dad && !ipv6_addr_is_solict_mult(daddr)) { |
675418d5 | 736 | ND_PRINTK(2, warn, "NS: bad DAD packet (wrong destination)\n"); |
1da177e4 LT |
737 | return; |
738 | } | |
739 | ||
740 | if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) { | |
675418d5 | 741 | ND_PRINTK(2, warn, "NS: invalid ND options\n"); |
1da177e4 LT |
742 | return; |
743 | } | |
744 | ||
745 | if (ndopts.nd_opts_src_lladdr) { | |
746 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, dev); | |
747 | if (!lladdr) { | |
675418d5 JP |
748 | ND_PRINTK(2, warn, |
749 | "NS: invalid link-layer address length\n"); | |
1da177e4 LT |
750 | return; |
751 | } | |
752 | ||
753 | /* RFC2461 7.1.1: | |
1ab1457c YH |
754 | * If the IP source address is the unspecified address, |
755 | * there MUST NOT be source link-layer address option | |
1da177e4 LT |
756 | * in the message. |
757 | */ | |
758 | if (dad) { | |
675418d5 JP |
759 | ND_PRINTK(2, warn, |
760 | "NS: bad DAD packet (link-layer address option)\n"); | |
1da177e4 LT |
761 | return; |
762 | } | |
763 | } | |
764 | ||
765 | inc = ipv6_addr_is_multicast(daddr); | |
766 | ||
c346dca1 | 767 | ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1); |
a18bc695 | 768 | if (ifp) { |
95c385b4 NH |
769 | |
770 | if (ifp->flags & (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC)) { | |
771 | if (dad) { | |
95c385b4 NH |
772 | /* |
773 | * We are colliding with another node | |
774 | * who is doing DAD | |
775 | * so fail our DAD process | |
776 | */ | |
777 | addrconf_dad_failure(ifp); | |
9e3be4b3 | 778 | return; |
95c385b4 NH |
779 | } else { |
780 | /* | |
781 | * This is not a dad solicitation. | |
782 | * If we are an optimistic node, | |
783 | * we should respond. | |
784 | * Otherwise, we should ignore it. | |
785 | */ | |
786 | if (!(ifp->flags & IFA_F_OPTIMISTIC)) | |
1da177e4 | 787 | goto out; |
1da177e4 | 788 | } |
1da177e4 LT |
789 | } |
790 | ||
791 | idev = ifp->idev; | |
792 | } else { | |
53b7997f YH |
793 | struct net *net = dev_net(dev); |
794 | ||
1da177e4 LT |
795 | idev = in6_dev_get(dev); |
796 | if (!idev) { | |
797 | /* XXX: count this drop? */ | |
798 | return; | |
799 | } | |
800 | ||
53b7997f | 801 | if (ipv6_chk_acast_addr(net, dev, &msg->target) || |
1ab1457c | 802 | (idev->cnf.forwarding && |
53b7997f | 803 | (net->ipv6.devconf_all->proxy_ndp || idev->cnf.proxy_ndp) && |
0736ffc0 | 804 | (is_router = pndisc_is_router(&msg->target, dev)) >= 0)) { |
a61bbcf2 | 805 | if (!(NEIGH_CB(skb)->flags & LOCALLY_ENQUEUED) && |
1da177e4 | 806 | skb->pkt_type != PACKET_HOST && |
f2f79cca | 807 | inc && |
1f9248e5 | 808 | NEIGH_VAR(idev->nd_parms, PROXY_DELAY) != 0) { |
1da177e4 LT |
809 | /* |
810 | * for anycast or proxy, | |
1ab1457c YH |
811 | * sender should delay its response |
812 | * by a random time between 0 and | |
1da177e4 LT |
813 | * MAX_ANYCAST_DELAY_TIME seconds. |
814 | * (RFC2461) -- yoshfuji | |
815 | */ | |
816 | struct sk_buff *n = skb_clone(skb, GFP_ATOMIC); | |
817 | if (n) | |
818 | pneigh_enqueue(&nd_tbl, idev->nd_parms, n); | |
819 | goto out; | |
820 | } | |
821 | } else | |
822 | goto out; | |
823 | } | |
824 | ||
0736ffc0 | 825 | if (is_router < 0) |
fb568637 | 826 | is_router = idev->cnf.forwarding; |
62dd9318 | 827 | |
1da177e4 | 828 | if (dad) { |
38cf595b | 829 | ndisc_send_na(dev, &in6addr_linklocal_allnodes, &msg->target, |
fb568637 | 830 | !!is_router, false, (ifp != NULL), true); |
1da177e4 LT |
831 | goto out; |
832 | } | |
833 | ||
834 | if (inc) | |
835 | NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_mcast); | |
836 | else | |
837 | NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_ucast); | |
838 | ||
1ab1457c | 839 | /* |
1da177e4 LT |
840 | * update / create cache entry |
841 | * for the source address | |
842 | */ | |
843 | neigh = __neigh_lookup(&nd_tbl, saddr, dev, | |
844 | !inc || lladdr || !dev->addr_len); | |
845 | if (neigh) | |
1ab1457c | 846 | neigh_update(neigh, lladdr, NUD_STALE, |
1da177e4 LT |
847 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
848 | NEIGH_UPDATE_F_OVERRIDE); | |
3b04ddde | 849 | if (neigh || !dev->header_ops) { |
38cf595b | 850 | ndisc_send_na(dev, saddr, &msg->target, !!is_router, |
fb568637 | 851 | true, (ifp != NULL && inc), inc); |
1da177e4 LT |
852 | if (neigh) |
853 | neigh_release(neigh); | |
854 | } | |
855 | ||
856 | out: | |
857 | if (ifp) | |
858 | in6_ifa_put(ifp); | |
859 | else | |
860 | in6_dev_put(idev); | |
1da177e4 LT |
861 | } |
862 | ||
863 | static void ndisc_recv_na(struct sk_buff *skb) | |
864 | { | |
9c70220b | 865 | struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb); |
be7a010d | 866 | struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; |
b71d1d42 | 867 | const struct in6_addr *daddr = &ipv6_hdr(skb)->daddr; |
1da177e4 | 868 | u8 *lladdr = NULL; |
29a3cad5 | 869 | u32 ndoptlen = skb_tail_pointer(skb) - (skb_transport_header(skb) + |
27a884dc | 870 | offsetof(struct nd_msg, opt)); |
1da177e4 LT |
871 | struct ndisc_options ndopts; |
872 | struct net_device *dev = skb->dev; | |
873 | struct inet6_ifaddr *ifp; | |
874 | struct neighbour *neigh; | |
875 | ||
876 | if (skb->len < sizeof(struct nd_msg)) { | |
675418d5 | 877 | ND_PRINTK(2, warn, "NA: packet too short\n"); |
1da177e4 LT |
878 | return; |
879 | } | |
880 | ||
881 | if (ipv6_addr_is_multicast(&msg->target)) { | |
675418d5 | 882 | ND_PRINTK(2, warn, "NA: target address is multicast\n"); |
1da177e4 LT |
883 | return; |
884 | } | |
885 | ||
886 | if (ipv6_addr_is_multicast(daddr) && | |
887 | msg->icmph.icmp6_solicited) { | |
675418d5 | 888 | ND_PRINTK(2, warn, "NA: solicited NA is multicasted\n"); |
1da177e4 LT |
889 | return; |
890 | } | |
1ab1457c | 891 | |
1da177e4 | 892 | if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) { |
675418d5 | 893 | ND_PRINTK(2, warn, "NS: invalid ND option\n"); |
1da177e4 LT |
894 | return; |
895 | } | |
896 | if (ndopts.nd_opts_tgt_lladdr) { | |
897 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, dev); | |
898 | if (!lladdr) { | |
675418d5 JP |
899 | ND_PRINTK(2, warn, |
900 | "NA: invalid link-layer address length\n"); | |
1da177e4 LT |
901 | return; |
902 | } | |
903 | } | |
c346dca1 | 904 | ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1); |
a18bc695 | 905 | if (ifp) { |
bd015928 DW |
906 | if (skb->pkt_type != PACKET_LOOPBACK |
907 | && (ifp->flags & IFA_F_TENTATIVE)) { | |
908 | addrconf_dad_failure(ifp); | |
909 | return; | |
1da177e4 LT |
910 | } |
911 | /* What should we make now? The advertisement | |
912 | is invalid, but ndisc specs say nothing | |
913 | about it. It could be misconfiguration, or | |
914 | an smart proxy agent tries to help us :-) | |
24fc7b86 JS |
915 | |
916 | We should not print the error if NA has been | |
917 | received from loopback - it is just our own | |
918 | unsolicited advertisement. | |
1da177e4 | 919 | */ |
24fc7b86 | 920 | if (skb->pkt_type != PACKET_LOOPBACK) |
675418d5 JP |
921 | ND_PRINTK(1, warn, |
922 | "NA: someone advertises our address %pI6 on %s!\n", | |
923 | &ifp->addr, ifp->idev->dev->name); | |
1da177e4 LT |
924 | in6_ifa_put(ifp); |
925 | return; | |
926 | } | |
927 | neigh = neigh_lookup(&nd_tbl, &msg->target, dev); | |
928 | ||
929 | if (neigh) { | |
930 | u8 old_flags = neigh->flags; | |
53b7997f | 931 | struct net *net = dev_net(dev); |
1da177e4 LT |
932 | |
933 | if (neigh->nud_state & NUD_FAILED) | |
934 | goto out; | |
935 | ||
5f3e6e9e VN |
936 | /* |
937 | * Don't update the neighbor cache entry on a proxy NA from | |
938 | * ourselves because either the proxied node is off link or it | |
939 | * has already sent a NA to us. | |
940 | */ | |
941 | if (lladdr && !memcmp(lladdr, dev->dev_addr, dev->addr_len) && | |
53b7997f YH |
942 | net->ipv6.devconf_all->forwarding && net->ipv6.devconf_all->proxy_ndp && |
943 | pneigh_lookup(&nd_tbl, net, &msg->target, dev, 0)) { | |
b20b6d97 | 944 | /* XXX: idev->cnf.proxy_ndp */ |
5f3e6e9e | 945 | goto out; |
fbea49e1 | 946 | } |
5f3e6e9e | 947 | |
1da177e4 LT |
948 | neigh_update(neigh, lladdr, |
949 | msg->icmph.icmp6_solicited ? NUD_REACHABLE : NUD_STALE, | |
950 | NEIGH_UPDATE_F_WEAK_OVERRIDE| | |
951 | (msg->icmph.icmp6_override ? NEIGH_UPDATE_F_OVERRIDE : 0)| | |
952 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
953 | (msg->icmph.icmp6_router ? NEIGH_UPDATE_F_ISROUTER : 0)); | |
954 | ||
955 | if ((old_flags & ~neigh->flags) & NTF_ROUTER) { | |
956 | /* | |
957 | * Change: router to host | |
958 | */ | |
be7a010d | 959 | rt6_clean_tohost(dev_net(dev), saddr); |
1da177e4 LT |
960 | } |
961 | ||
962 | out: | |
963 | neigh_release(neigh); | |
964 | } | |
965 | } | |
966 | ||
967 | static void ndisc_recv_rs(struct sk_buff *skb) | |
968 | { | |
9c70220b | 969 | struct rs_msg *rs_msg = (struct rs_msg *)skb_transport_header(skb); |
1da177e4 LT |
970 | unsigned long ndoptlen = skb->len - sizeof(*rs_msg); |
971 | struct neighbour *neigh; | |
972 | struct inet6_dev *idev; | |
b71d1d42 | 973 | const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; |
1da177e4 LT |
974 | struct ndisc_options ndopts; |
975 | u8 *lladdr = NULL; | |
976 | ||
977 | if (skb->len < sizeof(*rs_msg)) | |
978 | return; | |
979 | ||
cfdf7647 | 980 | idev = __in6_dev_get(skb->dev); |
1da177e4 | 981 | if (!idev) { |
675418d5 | 982 | ND_PRINTK(1, err, "RS: can't find in6 device\n"); |
1da177e4 LT |
983 | return; |
984 | } | |
985 | ||
986 | /* Don't accept RS if we're not in router mode */ | |
987 | if (!idev->cnf.forwarding) | |
988 | goto out; | |
989 | ||
990 | /* | |
991 | * Don't update NCE if src = ::; | |
992 | * this implies that the source node has no ip address assigned yet. | |
993 | */ | |
994 | if (ipv6_addr_any(saddr)) | |
995 | goto out; | |
996 | ||
997 | /* Parse ND options */ | |
998 | if (!ndisc_parse_options(rs_msg->opt, ndoptlen, &ndopts)) { | |
675418d5 | 999 | ND_PRINTK(2, notice, "NS: invalid ND option, ignored\n"); |
1da177e4 LT |
1000 | goto out; |
1001 | } | |
1002 | ||
1003 | if (ndopts.nd_opts_src_lladdr) { | |
1004 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, | |
1005 | skb->dev); | |
1006 | if (!lladdr) | |
1007 | goto out; | |
1008 | } | |
1009 | ||
1010 | neigh = __neigh_lookup(&nd_tbl, saddr, skb->dev, 1); | |
1011 | if (neigh) { | |
1012 | neigh_update(neigh, lladdr, NUD_STALE, | |
1013 | NEIGH_UPDATE_F_WEAK_OVERRIDE| | |
1014 | NEIGH_UPDATE_F_OVERRIDE| | |
1015 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER); | |
1016 | neigh_release(neigh); | |
1017 | } | |
1018 | out: | |
cfdf7647 | 1019 | return; |
1da177e4 LT |
1020 | } |
1021 | ||
31910575 PY |
1022 | static void ndisc_ra_useropt(struct sk_buff *ra, struct nd_opt_hdr *opt) |
1023 | { | |
1024 | struct icmp6hdr *icmp6h = (struct icmp6hdr *)skb_transport_header(ra); | |
1025 | struct sk_buff *skb; | |
1026 | struct nlmsghdr *nlh; | |
1027 | struct nduseroptmsg *ndmsg; | |
c346dca1 | 1028 | struct net *net = dev_net(ra->dev); |
31910575 PY |
1029 | int err; |
1030 | int base_size = NLMSG_ALIGN(sizeof(struct nduseroptmsg) | |
1031 | + (opt->nd_opt_len << 3)); | |
1032 | size_t msg_size = base_size + nla_total_size(sizeof(struct in6_addr)); | |
1033 | ||
1034 | skb = nlmsg_new(msg_size, GFP_ATOMIC); | |
63159f29 | 1035 | if (!skb) { |
31910575 PY |
1036 | err = -ENOBUFS; |
1037 | goto errout; | |
1038 | } | |
1039 | ||
1040 | nlh = nlmsg_put(skb, 0, 0, RTM_NEWNDUSEROPT, base_size, 0); | |
63159f29 | 1041 | if (!nlh) { |
31910575 PY |
1042 | goto nla_put_failure; |
1043 | } | |
1044 | ||
1045 | ndmsg = nlmsg_data(nlh); | |
1046 | ndmsg->nduseropt_family = AF_INET6; | |
dbb2ed24 | 1047 | ndmsg->nduseropt_ifindex = ra->dev->ifindex; |
31910575 PY |
1048 | ndmsg->nduseropt_icmp_type = icmp6h->icmp6_type; |
1049 | ndmsg->nduseropt_icmp_code = icmp6h->icmp6_code; | |
1050 | ndmsg->nduseropt_opts_len = opt->nd_opt_len << 3; | |
1051 | ||
1052 | memcpy(ndmsg + 1, opt, opt->nd_opt_len << 3); | |
1053 | ||
930345ea | 1054 | if (nla_put_in6_addr(skb, NDUSEROPT_SRCADDR, &ipv6_hdr(ra)->saddr)) |
c78679e8 | 1055 | goto nla_put_failure; |
31910575 PY |
1056 | nlmsg_end(skb, nlh); |
1057 | ||
1ce85fe4 | 1058 | rtnl_notify(skb, net, 0, RTNLGRP_ND_USEROPT, NULL, GFP_ATOMIC); |
31910575 PY |
1059 | return; |
1060 | ||
1061 | nla_put_failure: | |
1062 | nlmsg_free(skb); | |
1063 | err = -EMSGSIZE; | |
1064 | errout: | |
a18bc695 | 1065 | rtnl_set_sk_err(net, RTNLGRP_ND_USEROPT, err); |
31910575 PY |
1066 | } |
1067 | ||
1da177e4 LT |
1068 | static void ndisc_router_discovery(struct sk_buff *skb) |
1069 | { | |
9c70220b | 1070 | struct ra_msg *ra_msg = (struct ra_msg *)skb_transport_header(skb); |
1da177e4 LT |
1071 | struct neighbour *neigh = NULL; |
1072 | struct inet6_dev *in6_dev; | |
65f5c7c1 | 1073 | struct rt6_info *rt = NULL; |
1da177e4 LT |
1074 | int lifetime; |
1075 | struct ndisc_options ndopts; | |
1076 | int optlen; | |
ebacaaa0 | 1077 | unsigned int pref = 0; |
a394eef5 | 1078 | __u32 old_if_flags; |
2053aeb6 | 1079 | bool send_ifinfo_notify = false; |
1da177e4 | 1080 | |
67ba4152 | 1081 | __u8 *opt = (__u8 *)(ra_msg + 1); |
1da177e4 | 1082 | |
29a3cad5 SH |
1083 | optlen = (skb_tail_pointer(skb) - skb_transport_header(skb)) - |
1084 | sizeof(struct ra_msg); | |
1da177e4 | 1085 | |
f2a762d8 BG |
1086 | ND_PRINTK(2, info, |
1087 | "RA: %s, dev: %s\n", | |
1088 | __func__, skb->dev->name); | |
0660e03f | 1089 | if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) { |
675418d5 | 1090 | ND_PRINTK(2, warn, "RA: source address is not link-local\n"); |
1da177e4 LT |
1091 | return; |
1092 | } | |
1093 | if (optlen < 0) { | |
675418d5 | 1094 | ND_PRINTK(2, warn, "RA: packet too short\n"); |
1da177e4 LT |
1095 | return; |
1096 | } | |
1097 | ||
de357cc0 | 1098 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 | 1099 | if (skb->ndisc_nodetype == NDISC_NODETYPE_HOST) { |
675418d5 | 1100 | ND_PRINTK(2, warn, "RA: from host or unauthorized router\n"); |
fadf6bf0 TF |
1101 | return; |
1102 | } | |
de357cc0 | 1103 | #endif |
fadf6bf0 | 1104 | |
1da177e4 LT |
1105 | /* |
1106 | * set the RA_RECV flag in the interface | |
1107 | */ | |
1108 | ||
cfdf7647 | 1109 | in6_dev = __in6_dev_get(skb->dev); |
63159f29 | 1110 | if (!in6_dev) { |
675418d5 JP |
1111 | ND_PRINTK(0, err, "RA: can't find inet6 device for %s\n", |
1112 | skb->dev->name); | |
1da177e4 LT |
1113 | return; |
1114 | } | |
1da177e4 LT |
1115 | |
1116 | if (!ndisc_parse_options(opt, optlen, &ndopts)) { | |
675418d5 | 1117 | ND_PRINTK(2, warn, "RA: invalid ND options\n"); |
1da177e4 LT |
1118 | return; |
1119 | } | |
1120 | ||
f2a762d8 BG |
1121 | if (!ipv6_accept_ra(in6_dev)) { |
1122 | ND_PRINTK(2, info, | |
1123 | "RA: %s, did not accept ra for dev: %s\n", | |
1124 | __func__, skb->dev->name); | |
31ce8c71 | 1125 | goto skip_linkparms; |
f2a762d8 | 1126 | } |
31ce8c71 | 1127 | |
de357cc0 | 1128 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 | 1129 | /* skip link-specific parameters from interior routers */ |
f2a762d8 BG |
1130 | if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT) { |
1131 | ND_PRINTK(2, info, | |
1132 | "RA: %s, nodetype is NODEFAULT, dev: %s\n", | |
1133 | __func__, skb->dev->name); | |
fadf6bf0 | 1134 | goto skip_linkparms; |
f2a762d8 | 1135 | } |
de357cc0 | 1136 | #endif |
fadf6bf0 | 1137 | |
1da177e4 LT |
1138 | if (in6_dev->if_flags & IF_RS_SENT) { |
1139 | /* | |
1140 | * flag that an RA was received after an RS was sent | |
1141 | * out on this interface. | |
1142 | */ | |
1143 | in6_dev->if_flags |= IF_RA_RCVD; | |
1144 | } | |
1145 | ||
1146 | /* | |
1147 | * Remember the managed/otherconf flags from most recently | |
1148 | * received RA message (RFC 2462) -- yoshfuji | |
1149 | */ | |
a394eef5 | 1150 | old_if_flags = in6_dev->if_flags; |
1da177e4 LT |
1151 | in6_dev->if_flags = (in6_dev->if_flags & ~(IF_RA_MANAGED | |
1152 | IF_RA_OTHERCONF)) | | |
1153 | (ra_msg->icmph.icmp6_addrconf_managed ? | |
1154 | IF_RA_MANAGED : 0) | | |
1155 | (ra_msg->icmph.icmp6_addrconf_other ? | |
1156 | IF_RA_OTHERCONF : 0); | |
1157 | ||
a394eef5 | 1158 | if (old_if_flags != in6_dev->if_flags) |
2053aeb6 | 1159 | send_ifinfo_notify = true; |
a394eef5 | 1160 | |
f2a762d8 BG |
1161 | if (!in6_dev->cnf.accept_ra_defrtr) { |
1162 | ND_PRINTK(2, info, | |
1163 | "RA: %s, defrtr is false for dev: %s\n", | |
1164 | __func__, skb->dev->name); | |
65f5c7c1 | 1165 | goto skip_defrtr; |
f2a762d8 | 1166 | } |
65f5c7c1 | 1167 | |
d9333196 BG |
1168 | /* Do not accept RA with source-addr found on local machine unless |
1169 | * accept_ra_from_local is set to true. | |
1170 | */ | |
b6428817 LR |
1171 | if (!in6_dev->cnf.accept_ra_from_local && |
1172 | ipv6_chk_addr(dev_net(in6_dev->dev), &ipv6_hdr(skb)->saddr, | |
1173 | NULL, 0)) { | |
f2a762d8 | 1174 | ND_PRINTK(2, info, |
d9333196 BG |
1175 | "RA from local address detected on dev: %s: default router ignored\n", |
1176 | skb->dev->name); | |
9f56220f | 1177 | goto skip_defrtr; |
f2a762d8 | 1178 | } |
9f56220f | 1179 | |
1da177e4 LT |
1180 | lifetime = ntohs(ra_msg->icmph.icmp6_rt_lifetime); |
1181 | ||
ebacaaa0 YH |
1182 | #ifdef CONFIG_IPV6_ROUTER_PREF |
1183 | pref = ra_msg->icmph.icmp6_router_pref; | |
1184 | /* 10b is handled as if it were 00b (medium) */ | |
930d6ff2 | 1185 | if (pref == ICMPV6_ROUTER_PREF_INVALID || |
6d5b78cd | 1186 | !in6_dev->cnf.accept_ra_rtr_pref) |
ebacaaa0 YH |
1187 | pref = ICMPV6_ROUTER_PREF_MEDIUM; |
1188 | #endif | |
1189 | ||
0660e03f | 1190 | rt = rt6_get_dflt_router(&ipv6_hdr(skb)->saddr, skb->dev); |
1da177e4 | 1191 | |
eb857186 DM |
1192 | if (rt) { |
1193 | neigh = dst_neigh_lookup(&rt->dst, &ipv6_hdr(skb)->saddr); | |
1194 | if (!neigh) { | |
675418d5 JP |
1195 | ND_PRINTK(0, err, |
1196 | "RA: %s got default router without neighbour\n", | |
1197 | __func__); | |
94e187c0 | 1198 | ip6_rt_put(rt); |
eb857186 DM |
1199 | return; |
1200 | } | |
1201 | } | |
1da177e4 | 1202 | if (rt && lifetime == 0) { |
e0a1ad73 | 1203 | ip6_del_rt(rt); |
1da177e4 LT |
1204 | rt = NULL; |
1205 | } | |
1206 | ||
f2a762d8 BG |
1207 | ND_PRINTK(3, info, "RA: rt: %p lifetime: %d, for dev: %s\n", |
1208 | rt, lifetime, skb->dev->name); | |
63159f29 | 1209 | if (!rt && lifetime) { |
f2a762d8 | 1210 | ND_PRINTK(3, info, "RA: adding default router\n"); |
1da177e4 | 1211 | |
0660e03f | 1212 | rt = rt6_add_dflt_router(&ipv6_hdr(skb)->saddr, skb->dev, pref); |
63159f29 | 1213 | if (!rt) { |
675418d5 JP |
1214 | ND_PRINTK(0, err, |
1215 | "RA: %s failed to add default route\n", | |
1216 | __func__); | |
1da177e4 LT |
1217 | return; |
1218 | } | |
1219 | ||
eb857186 | 1220 | neigh = dst_neigh_lookup(&rt->dst, &ipv6_hdr(skb)->saddr); |
63159f29 | 1221 | if (!neigh) { |
675418d5 JP |
1222 | ND_PRINTK(0, err, |
1223 | "RA: %s got default router without neighbour\n", | |
1224 | __func__); | |
94e187c0 | 1225 | ip6_rt_put(rt); |
1da177e4 LT |
1226 | return; |
1227 | } | |
1228 | neigh->flags |= NTF_ROUTER; | |
ebacaaa0 | 1229 | } else if (rt) { |
22441cfa | 1230 | rt->rt6i_flags = (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); |
1da177e4 LT |
1231 | } |
1232 | ||
1233 | if (rt) | |
1716a961 | 1234 | rt6_set_expires(rt, jiffies + (HZ * lifetime)); |
8013d1d7 HL |
1235 | if (in6_dev->cnf.accept_ra_min_hop_limit < 256 && |
1236 | ra_msg->icmph.icmp6_hop_limit) { | |
1237 | if (in6_dev->cnf.accept_ra_min_hop_limit <= ra_msg->icmph.icmp6_hop_limit) { | |
6fd99094 | 1238 | in6_dev->cnf.hop_limit = ra_msg->icmph.icmp6_hop_limit; |
8013d1d7 HL |
1239 | if (rt) |
1240 | dst_metric_set(&rt->dst, RTAX_HOPLIMIT, | |
1241 | ra_msg->icmph.icmp6_hop_limit); | |
6fd99094 | 1242 | } else { |
8013d1d7 | 1243 | ND_PRINTK(2, warn, "RA: Got route advertisement with lower hop_limit than minimum\n"); |
6fd99094 | 1244 | } |
1da177e4 LT |
1245 | } |
1246 | ||
65f5c7c1 YH |
1247 | skip_defrtr: |
1248 | ||
1da177e4 LT |
1249 | /* |
1250 | * Update Reachable Time and Retrans Timer | |
1251 | */ | |
1252 | ||
1253 | if (in6_dev->nd_parms) { | |
1254 | unsigned long rtime = ntohl(ra_msg->retrans_timer); | |
1255 | ||
1256 | if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/HZ) { | |
1257 | rtime = (rtime*HZ)/1000; | |
1258 | if (rtime < HZ/10) | |
1259 | rtime = HZ/10; | |
1f9248e5 | 1260 | NEIGH_VAR_SET(in6_dev->nd_parms, RETRANS_TIME, rtime); |
1da177e4 | 1261 | in6_dev->tstamp = jiffies; |
2053aeb6 | 1262 | send_ifinfo_notify = true; |
1da177e4 LT |
1263 | } |
1264 | ||
1265 | rtime = ntohl(ra_msg->reachable_time); | |
1266 | if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/(3*HZ)) { | |
1267 | rtime = (rtime*HZ)/1000; | |
1268 | ||
1269 | if (rtime < HZ/10) | |
1270 | rtime = HZ/10; | |
1271 | ||
1f9248e5 JP |
1272 | if (rtime != NEIGH_VAR(in6_dev->nd_parms, BASE_REACHABLE_TIME)) { |
1273 | NEIGH_VAR_SET(in6_dev->nd_parms, | |
1274 | BASE_REACHABLE_TIME, rtime); | |
1275 | NEIGH_VAR_SET(in6_dev->nd_parms, | |
1276 | GC_STALETIME, 3 * rtime); | |
1da177e4 LT |
1277 | in6_dev->nd_parms->reachable_time = neigh_rand_reach_time(rtime); |
1278 | in6_dev->tstamp = jiffies; | |
2053aeb6 | 1279 | send_ifinfo_notify = true; |
1da177e4 LT |
1280 | } |
1281 | } | |
1282 | } | |
1283 | ||
2053aeb6 MT |
1284 | /* |
1285 | * Send a notify if RA changed managed/otherconf flags or timer settings | |
1286 | */ | |
1287 | if (send_ifinfo_notify) | |
1288 | inet6_ifinfo_notify(RTM_NEWLINK, in6_dev); | |
1289 | ||
fadf6bf0 TF |
1290 | skip_linkparms: |
1291 | ||
1da177e4 LT |
1292 | /* |
1293 | * Process options. | |
1294 | */ | |
1295 | ||
1296 | if (!neigh) | |
0660e03f | 1297 | neigh = __neigh_lookup(&nd_tbl, &ipv6_hdr(skb)->saddr, |
1da177e4 LT |
1298 | skb->dev, 1); |
1299 | if (neigh) { | |
1300 | u8 *lladdr = NULL; | |
1301 | if (ndopts.nd_opts_src_lladdr) { | |
1302 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, | |
1303 | skb->dev); | |
1304 | if (!lladdr) { | |
675418d5 JP |
1305 | ND_PRINTK(2, warn, |
1306 | "RA: invalid link-layer address length\n"); | |
1da177e4 LT |
1307 | goto out; |
1308 | } | |
1309 | } | |
1310 | neigh_update(neigh, lladdr, NUD_STALE, | |
1311 | NEIGH_UPDATE_F_WEAK_OVERRIDE| | |
1312 | NEIGH_UPDATE_F_OVERRIDE| | |
1313 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
1314 | NEIGH_UPDATE_F_ISROUTER); | |
1315 | } | |
1316 | ||
f2a762d8 BG |
1317 | if (!ipv6_accept_ra(in6_dev)) { |
1318 | ND_PRINTK(2, info, | |
1319 | "RA: %s, accept_ra is false for dev: %s\n", | |
1320 | __func__, skb->dev->name); | |
31ce8c71 | 1321 | goto out; |
f2a762d8 | 1322 | } |
31ce8c71 | 1323 | |
70ceb4f5 | 1324 | #ifdef CONFIG_IPV6_ROUTE_INFO |
b6428817 LR |
1325 | if (!in6_dev->cnf.accept_ra_from_local && |
1326 | ipv6_chk_addr(dev_net(in6_dev->dev), &ipv6_hdr(skb)->saddr, | |
1327 | NULL, 0)) { | |
f2a762d8 | 1328 | ND_PRINTK(2, info, |
d9333196 BG |
1329 | "RA from local address detected on dev: %s: router info ignored.\n", |
1330 | skb->dev->name); | |
9f56220f | 1331 | goto skip_routeinfo; |
f2a762d8 | 1332 | } |
9f56220f | 1333 | |
09c884d4 | 1334 | if (in6_dev->cnf.accept_ra_rtr_pref && ndopts.nd_opts_ri) { |
70ceb4f5 YH |
1335 | struct nd_opt_hdr *p; |
1336 | for (p = ndopts.nd_opts_ri; | |
1337 | p; | |
1338 | p = ndisc_next_option(p, ndopts.nd_opts_ri_end)) { | |
6294e000 YH |
1339 | struct route_info *ri = (struct route_info *)p; |
1340 | #ifdef CONFIG_IPV6_NDISC_NODETYPE | |
1341 | if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT && | |
1342 | ri->prefix_len == 0) | |
1343 | continue; | |
1344 | #endif | |
30e56918 DJ |
1345 | if (ri->prefix_len == 0 && |
1346 | !in6_dev->cnf.accept_ra_defrtr) | |
1347 | continue; | |
6294e000 | 1348 | if (ri->prefix_len > in6_dev->cnf.accept_ra_rt_info_max_plen) |
09c884d4 | 1349 | continue; |
67ba4152 | 1350 | rt6_route_rcv(skb->dev, (u8 *)p, (p->nd_opt_len) << 3, |
0660e03f | 1351 | &ipv6_hdr(skb)->saddr); |
70ceb4f5 YH |
1352 | } |
1353 | } | |
9f56220f AH |
1354 | |
1355 | skip_routeinfo: | |
70ceb4f5 YH |
1356 | #endif |
1357 | ||
de357cc0 | 1358 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 | 1359 | /* skip link-specific ndopts from interior routers */ |
f2a762d8 BG |
1360 | if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT) { |
1361 | ND_PRINTK(2, info, | |
1362 | "RA: %s, nodetype is NODEFAULT (interior routes), dev: %s\n", | |
1363 | __func__, skb->dev->name); | |
fadf6bf0 | 1364 | goto out; |
f2a762d8 | 1365 | } |
de357cc0 | 1366 | #endif |
fadf6bf0 | 1367 | |
c4fd30eb | 1368 | if (in6_dev->cnf.accept_ra_pinfo && ndopts.nd_opts_pi) { |
1da177e4 LT |
1369 | struct nd_opt_hdr *p; |
1370 | for (p = ndopts.nd_opts_pi; | |
1371 | p; | |
1372 | p = ndisc_next_option(p, ndopts.nd_opts_pi_end)) { | |
e6bff995 NH |
1373 | addrconf_prefix_rcv(skb->dev, (u8 *)p, |
1374 | (p->nd_opt_len) << 3, | |
1375 | ndopts.nd_opts_src_lladdr != NULL); | |
1da177e4 LT |
1376 | } |
1377 | } | |
1378 | ||
c2943f14 | 1379 | if (ndopts.nd_opts_mtu && in6_dev->cnf.accept_ra_mtu) { |
e69a4adc | 1380 | __be32 n; |
1da177e4 LT |
1381 | u32 mtu; |
1382 | ||
67ba4152 | 1383 | memcpy(&n, ((u8 *)(ndopts.nd_opts_mtu+1))+2, sizeof(mtu)); |
e69a4adc | 1384 | mtu = ntohl(n); |
1da177e4 LT |
1385 | |
1386 | if (mtu < IPV6_MIN_MTU || mtu > skb->dev->mtu) { | |
675418d5 | 1387 | ND_PRINTK(2, warn, "RA: invalid mtu: %d\n", mtu); |
1da177e4 LT |
1388 | } else if (in6_dev->cnf.mtu6 != mtu) { |
1389 | in6_dev->cnf.mtu6 = mtu; | |
1390 | ||
1391 | if (rt) | |
defb3519 | 1392 | dst_metric_set(&rt->dst, RTAX_MTU, mtu); |
1da177e4 LT |
1393 | |
1394 | rt6_mtu_change(skb->dev, mtu); | |
1395 | } | |
1396 | } | |
1ab1457c | 1397 | |
31910575 | 1398 | if (ndopts.nd_useropts) { |
61cf46ad YH |
1399 | struct nd_opt_hdr *p; |
1400 | for (p = ndopts.nd_useropts; | |
1401 | p; | |
1402 | p = ndisc_next_useropt(p, ndopts.nd_useropts_end)) { | |
1403 | ndisc_ra_useropt(skb, p); | |
31910575 PY |
1404 | } |
1405 | } | |
1406 | ||
1da177e4 | 1407 | if (ndopts.nd_opts_tgt_lladdr || ndopts.nd_opts_rh) { |
675418d5 | 1408 | ND_PRINTK(2, warn, "RA: invalid RA options\n"); |
1da177e4 LT |
1409 | } |
1410 | out: | |
94e187c0 | 1411 | ip6_rt_put(rt); |
eb857186 | 1412 | if (neigh) |
1da177e4 | 1413 | neigh_release(neigh); |
1da177e4 LT |
1414 | } |
1415 | ||
1416 | static void ndisc_redirect_rcv(struct sk_buff *skb) | |
1417 | { | |
093d04d4 DJ |
1418 | u8 *hdr; |
1419 | struct ndisc_options ndopts; | |
1420 | struct rd_msg *msg = (struct rd_msg *)skb_transport_header(skb); | |
29a3cad5 | 1421 | u32 ndoptlen = skb_tail_pointer(skb) - (skb_transport_header(skb) + |
093d04d4 DJ |
1422 | offsetof(struct rd_msg, opt)); |
1423 | ||
de357cc0 | 1424 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 TF |
1425 | switch (skb->ndisc_nodetype) { |
1426 | case NDISC_NODETYPE_HOST: | |
1427 | case NDISC_NODETYPE_NODEFAULT: | |
675418d5 JP |
1428 | ND_PRINTK(2, warn, |
1429 | "Redirect: from host or unauthorized router\n"); | |
fadf6bf0 TF |
1430 | return; |
1431 | } | |
de357cc0 | 1432 | #endif |
fadf6bf0 | 1433 | |
0660e03f | 1434 | if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) { |
675418d5 JP |
1435 | ND_PRINTK(2, warn, |
1436 | "Redirect: source address is not link-local\n"); | |
1da177e4 LT |
1437 | return; |
1438 | } | |
1439 | ||
093d04d4 DJ |
1440 | if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) |
1441 | return; | |
1442 | ||
c92a59ec | 1443 | if (!ndopts.nd_opts_rh) { |
b55b76b2 DJ |
1444 | ip6_redirect_no_header(skb, dev_net(skb->dev), |
1445 | skb->dev->ifindex, 0); | |
093d04d4 | 1446 | return; |
c92a59ec | 1447 | } |
093d04d4 DJ |
1448 | |
1449 | hdr = (u8 *)ndopts.nd_opts_rh; | |
1450 | hdr += 8; | |
1451 | if (!pskb_pull(skb, hdr - skb_transport_header(skb))) | |
1452 | return; | |
1453 | ||
b94f1c09 | 1454 | icmpv6_notify(skb, NDISC_REDIRECT, 0, 0); |
1da177e4 LT |
1455 | } |
1456 | ||
5f5a0115 YH |
1457 | static void ndisc_fill_redirect_hdr_option(struct sk_buff *skb, |
1458 | struct sk_buff *orig_skb, | |
1459 | int rd_len) | |
9c86dafe | 1460 | { |
5f5a0115 YH |
1461 | u8 *opt = skb_put(skb, rd_len); |
1462 | ||
9c86dafe YH |
1463 | memset(opt, 0, 8); |
1464 | *(opt++) = ND_OPT_REDIRECT_HDR; | |
1465 | *(opt++) = (rd_len >> 3); | |
1466 | opt += 6; | |
1467 | ||
1468 | memcpy(opt, ipv6_hdr(orig_skb), rd_len - 8); | |
9c86dafe YH |
1469 | } |
1470 | ||
4991969a | 1471 | void ndisc_send_redirect(struct sk_buff *skb, const struct in6_addr *target) |
1da177e4 | 1472 | { |
1762f7e8 | 1473 | struct net_device *dev = skb->dev; |
c346dca1 | 1474 | struct net *net = dev_net(dev); |
1762f7e8 | 1475 | struct sock *sk = net->ipv6.ndisc_sk; |
2ce13576 | 1476 | int optlen = 0; |
fbfe95a4 | 1477 | struct inet_peer *peer; |
1da177e4 | 1478 | struct sk_buff *buff; |
71bcdba0 | 1479 | struct rd_msg *msg; |
1da177e4 | 1480 | struct in6_addr saddr_buf; |
1da177e4 LT |
1481 | struct rt6_info *rt; |
1482 | struct dst_entry *dst; | |
4c9483b2 | 1483 | struct flowi6 fl6; |
1da177e4 | 1484 | int rd_len; |
1da177e4 | 1485 | u8 ha_buf[MAX_ADDR_LEN], *ha = NULL; |
1d861aa4 | 1486 | bool ret; |
1da177e4 | 1487 | |
95c385b4 | 1488 | if (ipv6_get_lladdr(dev, &saddr_buf, IFA_F_TENTATIVE)) { |
675418d5 JP |
1489 | ND_PRINTK(2, warn, "Redirect: no link-local address on %s\n", |
1490 | dev->name); | |
1ab1457c YH |
1491 | return; |
1492 | } | |
1da177e4 | 1493 | |
0660e03f | 1494 | if (!ipv6_addr_equal(&ipv6_hdr(skb)->daddr, target) && |
bf0b48df | 1495 | ipv6_addr_type(target) != (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) { |
675418d5 JP |
1496 | ND_PRINTK(2, warn, |
1497 | "Redirect: target address is not link-local unicast\n"); | |
29556526 LY |
1498 | return; |
1499 | } | |
1500 | ||
4c9483b2 | 1501 | icmpv6_flow_init(sk, &fl6, NDISC_REDIRECT, |
95e41e93 | 1502 | &saddr_buf, &ipv6_hdr(skb)->saddr, dev->ifindex); |
1da177e4 | 1503 | |
4c9483b2 | 1504 | dst = ip6_route_output(net, NULL, &fl6); |
5095d64d RL |
1505 | if (dst->error) { |
1506 | dst_release(dst); | |
1da177e4 | 1507 | return; |
5095d64d | 1508 | } |
4c9483b2 | 1509 | dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), NULL, 0); |
452edd59 | 1510 | if (IS_ERR(dst)) |
1da177e4 | 1511 | return; |
1da177e4 LT |
1512 | |
1513 | rt = (struct rt6_info *) dst; | |
1514 | ||
1515 | if (rt->rt6i_flags & RTF_GATEWAY) { | |
675418d5 JP |
1516 | ND_PRINTK(2, warn, |
1517 | "Redirect: destination is not a neighbour\n"); | |
d73f0801 | 1518 | goto release; |
1da177e4 | 1519 | } |
fd0273d7 | 1520 | peer = inet_getpeer_v6(net->ipv6.peers, &ipv6_hdr(skb)->saddr, 1); |
1d861aa4 DM |
1521 | ret = inet_peer_xrlim_allow(peer, 1*HZ); |
1522 | if (peer) | |
1523 | inet_putpeer(peer); | |
1524 | if (!ret) | |
d73f0801 | 1525 | goto release; |
1da177e4 LT |
1526 | |
1527 | if (dev->addr_len) { | |
4991969a DM |
1528 | struct neighbour *neigh = dst_neigh_lookup(skb_dst(skb), target); |
1529 | if (!neigh) { | |
675418d5 JP |
1530 | ND_PRINTK(2, warn, |
1531 | "Redirect: no neigh for target address\n"); | |
4991969a DM |
1532 | goto release; |
1533 | } | |
1534 | ||
1da177e4 LT |
1535 | read_lock_bh(&neigh->lock); |
1536 | if (neigh->nud_state & NUD_VALID) { | |
1537 | memcpy(ha_buf, neigh->ha, dev->addr_len); | |
1538 | read_unlock_bh(&neigh->lock); | |
1539 | ha = ha_buf; | |
2ce13576 | 1540 | optlen += ndisc_opt_addr_space(dev); |
1da177e4 LT |
1541 | } else |
1542 | read_unlock_bh(&neigh->lock); | |
4991969a DM |
1543 | |
1544 | neigh_release(neigh); | |
1da177e4 LT |
1545 | } |
1546 | ||
1547 | rd_len = min_t(unsigned int, | |
2ce13576 YH |
1548 | IPV6_MIN_MTU - sizeof(struct ipv6hdr) - sizeof(*msg) - optlen, |
1549 | skb->len + 8); | |
1da177e4 | 1550 | rd_len &= ~0x7; |
2ce13576 | 1551 | optlen += rd_len; |
1da177e4 | 1552 | |
2ce13576 | 1553 | buff = ndisc_alloc_skb(dev, sizeof(*msg) + optlen); |
de09334b | 1554 | if (!buff) |
d73f0801 | 1555 | goto release; |
1da177e4 | 1556 | |
4d5c152e YH |
1557 | msg = (struct rd_msg *)skb_put(buff, sizeof(*msg)); |
1558 | *msg = (struct rd_msg) { | |
1559 | .icmph = { | |
1560 | .icmp6_type = NDISC_REDIRECT, | |
1561 | }, | |
1562 | .target = *target, | |
1563 | .dest = ipv6_hdr(skb)->daddr, | |
1564 | }; | |
1da177e4 | 1565 | |
1da177e4 LT |
1566 | /* |
1567 | * include target_address option | |
1568 | */ | |
1569 | ||
1570 | if (ha) | |
33be081a | 1571 | ndisc_fill_addr_option(buff, ND_OPT_TARGET_LL_ADDR, ha); |
1da177e4 LT |
1572 | |
1573 | /* | |
1574 | * build redirect option and copy skb over to the new packet. | |
1575 | */ | |
1576 | ||
9c86dafe | 1577 | if (rd_len) |
5f5a0115 | 1578 | ndisc_fill_redirect_hdr_option(buff, skb, rd_len); |
1da177e4 | 1579 | |
adf30907 | 1580 | skb_dst_set(buff, dst); |
f4de84c6 | 1581 | ndisc_send_skb(buff, &ipv6_hdr(skb)->saddr, &saddr_buf); |
d73f0801 IJ |
1582 | return; |
1583 | ||
1584 | release: | |
1585 | dst_release(dst); | |
1da177e4 LT |
1586 | } |
1587 | ||
1588 | static void pndisc_redo(struct sk_buff *skb) | |
1589 | { | |
140e26fc | 1590 | ndisc_recv_ns(skb); |
1da177e4 LT |
1591 | kfree_skb(skb); |
1592 | } | |
1593 | ||
b800c3b9 HFS |
1594 | static bool ndisc_suppress_frag_ndisc(struct sk_buff *skb) |
1595 | { | |
1596 | struct inet6_dev *idev = __in6_dev_get(skb->dev); | |
1597 | ||
1598 | if (!idev) | |
1599 | return true; | |
1600 | if (IP6CB(skb)->flags & IP6SKB_FRAGMENTED && | |
1601 | idev->cnf.suppress_frag_ndisc) { | |
1602 | net_warn_ratelimited("Received fragmented ndisc packet. Carefully consider disabling suppress_frag_ndisc.\n"); | |
1603 | return true; | |
1604 | } | |
1605 | return false; | |
1606 | } | |
1607 | ||
1da177e4 LT |
1608 | int ndisc_rcv(struct sk_buff *skb) |
1609 | { | |
1610 | struct nd_msg *msg; | |
1611 | ||
b800c3b9 HFS |
1612 | if (ndisc_suppress_frag_ndisc(skb)) |
1613 | return 0; | |
1614 | ||
6bce6b4e | 1615 | if (skb_linearize(skb)) |
1da177e4 LT |
1616 | return 0; |
1617 | ||
9c70220b | 1618 | msg = (struct nd_msg *)skb_transport_header(skb); |
1da177e4 | 1619 | |
9c70220b | 1620 | __skb_push(skb, skb->data - skb_transport_header(skb)); |
1da177e4 | 1621 | |
0660e03f | 1622 | if (ipv6_hdr(skb)->hop_limit != 255) { |
675418d5 JP |
1623 | ND_PRINTK(2, warn, "NDISC: invalid hop-limit: %d\n", |
1624 | ipv6_hdr(skb)->hop_limit); | |
1da177e4 LT |
1625 | return 0; |
1626 | } | |
1627 | ||
1628 | if (msg->icmph.icmp6_code != 0) { | |
675418d5 JP |
1629 | ND_PRINTK(2, warn, "NDISC: invalid ICMPv6 code: %d\n", |
1630 | msg->icmph.icmp6_code); | |
1da177e4 LT |
1631 | return 0; |
1632 | } | |
1633 | ||
a61bbcf2 PM |
1634 | memset(NEIGH_CB(skb), 0, sizeof(struct neighbour_cb)); |
1635 | ||
1da177e4 LT |
1636 | switch (msg->icmph.icmp6_type) { |
1637 | case NDISC_NEIGHBOUR_SOLICITATION: | |
1638 | ndisc_recv_ns(skb); | |
1639 | break; | |
1640 | ||
1641 | case NDISC_NEIGHBOUR_ADVERTISEMENT: | |
1642 | ndisc_recv_na(skb); | |
1643 | break; | |
1644 | ||
1645 | case NDISC_ROUTER_SOLICITATION: | |
1646 | ndisc_recv_rs(skb); | |
1647 | break; | |
1648 | ||
1649 | case NDISC_ROUTER_ADVERTISEMENT: | |
1650 | ndisc_router_discovery(skb); | |
1651 | break; | |
1652 | ||
1653 | case NDISC_REDIRECT: | |
1654 | ndisc_redirect_rcv(skb); | |
1655 | break; | |
3ff50b79 | 1656 | } |
1da177e4 LT |
1657 | |
1658 | return 0; | |
1659 | } | |
1660 | ||
1661 | static int ndisc_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1662 | { | |
351638e7 | 1663 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
c8507fb2 | 1664 | struct netdev_notifier_change_info *change_info; |
c346dca1 | 1665 | struct net *net = dev_net(dev); |
5cb04436 | 1666 | struct inet6_dev *idev; |
1da177e4 LT |
1667 | |
1668 | switch (event) { | |
1669 | case NETDEV_CHANGEADDR: | |
1670 | neigh_changeaddr(&nd_tbl, dev); | |
2ac3ac8f | 1671 | fib6_run_gc(0, net, false); |
5cb04436 HFS |
1672 | idev = in6_dev_get(dev); |
1673 | if (!idev) | |
1674 | break; | |
1675 | if (idev->cnf.ndisc_notify) | |
1676 | ndisc_send_unsol_na(dev); | |
1677 | in6_dev_put(idev); | |
1da177e4 | 1678 | break; |
c8507fb2 ED |
1679 | case NETDEV_CHANGE: |
1680 | change_info = ptr; | |
1681 | if (change_info->flags_changed & IFF_NOARP) | |
1682 | neigh_changeaddr(&nd_tbl, dev); | |
1683 | break; | |
1da177e4 LT |
1684 | case NETDEV_DOWN: |
1685 | neigh_ifdown(&nd_tbl, dev); | |
2ac3ac8f | 1686 | fib6_run_gc(0, net, false); |
1da177e4 | 1687 | break; |
f47b9464 BH |
1688 | case NETDEV_NOTIFY_PEERS: |
1689 | ndisc_send_unsol_na(dev); | |
1690 | break; | |
1da177e4 LT |
1691 | default: |
1692 | break; | |
1693 | } | |
1694 | ||
1695 | return NOTIFY_DONE; | |
1696 | } | |
1697 | ||
1698 | static struct notifier_block ndisc_netdev_notifier = { | |
1699 | .notifier_call = ndisc_netdev_event, | |
1700 | }; | |
1701 | ||
1702 | #ifdef CONFIG_SYSCTL | |
1703 | static void ndisc_warn_deprecated_sysctl(struct ctl_table *ctl, | |
1704 | const char *func, const char *dev_name) | |
1705 | { | |
1706 | static char warncomm[TASK_COMM_LEN]; | |
1707 | static int warned; | |
1708 | if (strcmp(warncomm, current->comm) && warned < 5) { | |
1709 | strcpy(warncomm, current->comm); | |
f3213831 | 1710 | 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 |
1711 | warncomm, func, |
1712 | dev_name, ctl->procname, | |
1713 | dev_name, ctl->procname); | |
1714 | warned++; | |
1715 | } | |
1716 | } | |
1717 | ||
8d65af78 | 1718 | int ndisc_ifinfo_sysctl_change(struct ctl_table *ctl, int write, void __user *buffer, size_t *lenp, loff_t *ppos) |
1da177e4 LT |
1719 | { |
1720 | struct net_device *dev = ctl->extra1; | |
1721 | struct inet6_dev *idev; | |
1722 | int ret; | |
1723 | ||
d12af679 EB |
1724 | if ((strcmp(ctl->procname, "retrans_time") == 0) || |
1725 | (strcmp(ctl->procname, "base_reachable_time") == 0)) | |
1da177e4 LT |
1726 | ndisc_warn_deprecated_sysctl(ctl, "syscall", dev ? dev->name : "default"); |
1727 | ||
d12af679 | 1728 | if (strcmp(ctl->procname, "retrans_time") == 0) |
cb5b09c1 | 1729 | ret = neigh_proc_dointvec(ctl, write, buffer, lenp, ppos); |
d12af679 EB |
1730 | |
1731 | else if (strcmp(ctl->procname, "base_reachable_time") == 0) | |
cb5b09c1 JP |
1732 | ret = neigh_proc_dointvec_jiffies(ctl, write, |
1733 | buffer, lenp, ppos); | |
d12af679 EB |
1734 | |
1735 | else if ((strcmp(ctl->procname, "retrans_time_ms") == 0) || | |
ad02ac14 | 1736 | (strcmp(ctl->procname, "base_reachable_time_ms") == 0)) |
cb5b09c1 JP |
1737 | ret = neigh_proc_dointvec_ms_jiffies(ctl, write, |
1738 | buffer, lenp, ppos); | |
d12af679 | 1739 | else |
1da177e4 | 1740 | ret = -1; |
1da177e4 LT |
1741 | |
1742 | if (write && ret == 0 && dev && (idev = in6_dev_get(dev)) != NULL) { | |
1f9248e5 JP |
1743 | if (ctl->data == &NEIGH_VAR(idev->nd_parms, BASE_REACHABLE_TIME)) |
1744 | idev->nd_parms->reachable_time = | |
1745 | neigh_rand_reach_time(NEIGH_VAR(idev->nd_parms, BASE_REACHABLE_TIME)); | |
1da177e4 LT |
1746 | idev->tstamp = jiffies; |
1747 | inet6_ifinfo_notify(RTM_NEWLINK, idev); | |
1748 | in6_dev_put(idev); | |
1749 | } | |
1750 | return ret; | |
1751 | } | |
1752 | ||
1da177e4 LT |
1753 | |
1754 | #endif | |
1755 | ||
2c8c1e72 | 1756 | static int __net_init ndisc_net_init(struct net *net) |
1da177e4 LT |
1757 | { |
1758 | struct ipv6_pinfo *np; | |
1759 | struct sock *sk; | |
1ab1457c | 1760 | int err; |
1da177e4 | 1761 | |
1ed8516f DL |
1762 | err = inet_ctl_sock_create(&sk, PF_INET6, |
1763 | SOCK_RAW, IPPROTO_ICMPV6, net); | |
1da177e4 | 1764 | if (err < 0) { |
675418d5 JP |
1765 | ND_PRINTK(0, err, |
1766 | "NDISC: Failed to initialize the control socket (err %d)\n", | |
1767 | err); | |
1da177e4 LT |
1768 | return err; |
1769 | } | |
1770 | ||
1ed8516f | 1771 | net->ipv6.ndisc_sk = sk; |
1762f7e8 | 1772 | |
1da177e4 | 1773 | np = inet6_sk(sk); |
1da177e4 LT |
1774 | np->hop_limit = 255; |
1775 | /* Do not loopback ndisc messages */ | |
1776 | np->mc_loop = 0; | |
1da177e4 | 1777 | |
1762f7e8 DL |
1778 | return 0; |
1779 | } | |
1780 | ||
2c8c1e72 | 1781 | static void __net_exit ndisc_net_exit(struct net *net) |
1762f7e8 | 1782 | { |
1ed8516f | 1783 | inet_ctl_sock_destroy(net->ipv6.ndisc_sk); |
1762f7e8 DL |
1784 | } |
1785 | ||
1786 | static struct pernet_operations ndisc_net_ops = { | |
1787 | .init = ndisc_net_init, | |
1788 | .exit = ndisc_net_exit, | |
1789 | }; | |
1790 | ||
1791 | int __init ndisc_init(void) | |
1792 | { | |
1793 | int err; | |
1794 | ||
1795 | err = register_pernet_subsys(&ndisc_net_ops); | |
1796 | if (err) | |
1797 | return err; | |
1ab1457c YH |
1798 | /* |
1799 | * Initialize the neighbour table | |
1800 | */ | |
d7480fd3 | 1801 | neigh_table_init(NEIGH_ND_TABLE, &nd_tbl); |
1da177e4 LT |
1802 | |
1803 | #ifdef CONFIG_SYSCTL | |
73af614a | 1804 | err = neigh_sysctl_register(NULL, &nd_tbl.parms, |
56ec0fb1 | 1805 | ndisc_ifinfo_sysctl_change); |
1762f7e8 DL |
1806 | if (err) |
1807 | goto out_unregister_pernet; | |
1762f7e8 | 1808 | out: |
bcd081a3 | 1809 | #endif |
1762f7e8 | 1810 | return err; |
1da177e4 | 1811 | |
1762f7e8 | 1812 | #ifdef CONFIG_SYSCTL |
1762f7e8 | 1813 | out_unregister_pernet: |
1762f7e8 DL |
1814 | unregister_pernet_subsys(&ndisc_net_ops); |
1815 | goto out; | |
2c861cc6 | 1816 | #endif |
1da177e4 LT |
1817 | } |
1818 | ||
2c861cc6 MK |
1819 | int __init ndisc_late_init(void) |
1820 | { | |
1821 | return register_netdevice_notifier(&ndisc_netdev_notifier); | |
1822 | } | |
1823 | ||
1824 | void ndisc_late_cleanup(void) | |
1da177e4 | 1825 | { |
36f73d0c | 1826 | unregister_netdevice_notifier(&ndisc_netdev_notifier); |
2c861cc6 MK |
1827 | } |
1828 | ||
1829 | void ndisc_cleanup(void) | |
1830 | { | |
1da177e4 LT |
1831 | #ifdef CONFIG_SYSCTL |
1832 | neigh_sysctl_unregister(&nd_tbl.parms); | |
1833 | #endif | |
d7480fd3 | 1834 | neigh_table_clear(NEIGH_ND_TABLE, &nd_tbl); |
1762f7e8 | 1835 | unregister_pernet_subsys(&ndisc_net_ops); |
1da177e4 | 1836 | } |