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 | * | |
31910575 PY |
18 | * Pierre Ynard : export userland ND options |
19 | * through netlink (RDNSS support) | |
1da177e4 LT |
20 | * Lars Fenneberg : fixed MTU setting on receipt |
21 | * of an RA. | |
1da177e4 LT |
22 | * Janos Farkas : kmalloc failure checks |
23 | * Alexey Kuznetsov : state machine reworked | |
24 | * and moved to net/core. | |
25 | * Pekka Savola : RFC2461 validation | |
26 | * YOSHIFUJI Hideaki @USAGI : Verify ND options properly | |
27 | */ | |
28 | ||
29 | /* Set to 3 to get tracing... */ | |
30 | #define ND_DEBUG 1 | |
31 | ||
32 | #define ND_PRINTK(fmt, args...) do { if (net_ratelimit()) { printk(fmt, ## args); } } while(0) | |
33 | #define ND_NOPRINTK(x...) do { ; } while(0) | |
34 | #define ND_PRINTK0 ND_PRINTK | |
35 | #define ND_PRINTK1 ND_NOPRINTK | |
36 | #define ND_PRINTK2 ND_NOPRINTK | |
37 | #define ND_PRINTK3 ND_NOPRINTK | |
38 | #if ND_DEBUG >= 1 | |
39 | #undef ND_PRINTK1 | |
40 | #define ND_PRINTK1 ND_PRINTK | |
41 | #endif | |
42 | #if ND_DEBUG >= 2 | |
43 | #undef ND_PRINTK2 | |
44 | #define ND_PRINTK2 ND_PRINTK | |
45 | #endif | |
46 | #if ND_DEBUG >= 3 | |
47 | #undef ND_PRINTK3 | |
48 | #define ND_PRINTK3 ND_PRINTK | |
49 | #endif | |
50 | ||
51 | #include <linux/module.h> | |
1da177e4 LT |
52 | #include <linux/errno.h> |
53 | #include <linux/types.h> | |
54 | #include <linux/socket.h> | |
55 | #include <linux/sockios.h> | |
56 | #include <linux/sched.h> | |
57 | #include <linux/net.h> | |
58 | #include <linux/in6.h> | |
59 | #include <linux/route.h> | |
60 | #include <linux/init.h> | |
61 | #include <linux/rcupdate.h> | |
5a0e3ad6 | 62 | #include <linux/slab.h> |
1da177e4 LT |
63 | #ifdef CONFIG_SYSCTL |
64 | #include <linux/sysctl.h> | |
65 | #endif | |
66 | ||
1823730f | 67 | #include <linux/if_addr.h> |
1da177e4 LT |
68 | #include <linux/if_arp.h> |
69 | #include <linux/ipv6.h> | |
70 | #include <linux/icmpv6.h> | |
71 | #include <linux/jhash.h> | |
72 | ||
73 | #include <net/sock.h> | |
74 | #include <net/snmp.h> | |
75 | ||
76 | #include <net/ipv6.h> | |
77 | #include <net/protocol.h> | |
78 | #include <net/ndisc.h> | |
79 | #include <net/ip6_route.h> | |
80 | #include <net/addrconf.h> | |
81 | #include <net/icmp.h> | |
82 | ||
31910575 PY |
83 | #include <net/netlink.h> |
84 | #include <linux/rtnetlink.h> | |
85 | ||
1da177e4 LT |
86 | #include <net/flow.h> |
87 | #include <net/ip6_checksum.h> | |
1ed8516f | 88 | #include <net/inet_common.h> |
1da177e4 LT |
89 | #include <linux/proc_fs.h> |
90 | ||
91 | #include <linux/netfilter.h> | |
92 | #include <linux/netfilter_ipv6.h> | |
93 | ||
d6bf7817 ED |
94 | static u32 ndisc_hash(const void *pkey, |
95 | const struct net_device *dev, | |
96 | __u32 rnd); | |
1da177e4 LT |
97 | static int ndisc_constructor(struct neighbour *neigh); |
98 | static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb); | |
99 | static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb); | |
100 | static int pndisc_constructor(struct pneigh_entry *n); | |
101 | static void pndisc_destructor(struct pneigh_entry *n); | |
102 | static void pndisc_redo(struct sk_buff *skb); | |
103 | ||
89d69d2b | 104 | static const struct neigh_ops ndisc_generic_ops = { |
1da177e4 LT |
105 | .family = AF_INET6, |
106 | .solicit = ndisc_solicit, | |
107 | .error_report = ndisc_error_report, | |
108 | .output = neigh_resolve_output, | |
109 | .connected_output = neigh_connected_output, | |
110 | .hh_output = dev_queue_xmit, | |
111 | .queue_xmit = dev_queue_xmit, | |
112 | }; | |
113 | ||
89d69d2b | 114 | static const struct neigh_ops ndisc_hh_ops = { |
1da177e4 LT |
115 | .family = AF_INET6, |
116 | .solicit = ndisc_solicit, | |
117 | .error_report = ndisc_error_report, | |
118 | .output = neigh_resolve_output, | |
119 | .connected_output = neigh_resolve_output, | |
120 | .hh_output = dev_queue_xmit, | |
121 | .queue_xmit = dev_queue_xmit, | |
122 | }; | |
123 | ||
124 | ||
89d69d2b | 125 | static const struct neigh_ops ndisc_direct_ops = { |
1da177e4 LT |
126 | .family = AF_INET6, |
127 | .output = dev_queue_xmit, | |
128 | .connected_output = dev_queue_xmit, | |
129 | .hh_output = dev_queue_xmit, | |
130 | .queue_xmit = dev_queue_xmit, | |
131 | }; | |
132 | ||
133 | struct neigh_table nd_tbl = { | |
134 | .family = AF_INET6, | |
135 | .entry_size = sizeof(struct neighbour) + sizeof(struct in6_addr), | |
136 | .key_len = sizeof(struct in6_addr), | |
137 | .hash = ndisc_hash, | |
138 | .constructor = ndisc_constructor, | |
139 | .pconstructor = pndisc_constructor, | |
140 | .pdestructor = pndisc_destructor, | |
141 | .proxy_redo = pndisc_redo, | |
142 | .id = "ndisc_cache", | |
143 | .parms = { | |
b672083e SW |
144 | .tbl = &nd_tbl, |
145 | .base_reachable_time = ND_REACHABLE_TIME, | |
146 | .retrans_time = ND_RETRANS_TIMER, | |
147 | .gc_staletime = 60 * HZ, | |
148 | .reachable_time = ND_REACHABLE_TIME, | |
149 | .delay_probe_time = 5 * HZ, | |
150 | .queue_len = 3, | |
151 | .ucast_probes = 3, | |
152 | .mcast_probes = 3, | |
153 | .anycast_delay = 1 * HZ, | |
154 | .proxy_delay = (8 * HZ) / 10, | |
155 | .proxy_qlen = 64, | |
1da177e4 LT |
156 | }, |
157 | .gc_interval = 30 * HZ, | |
158 | .gc_thresh1 = 128, | |
159 | .gc_thresh2 = 512, | |
160 | .gc_thresh3 = 1024, | |
161 | }; | |
162 | ||
163 | /* ND options */ | |
164 | struct ndisc_options { | |
70ceb4f5 YH |
165 | struct nd_opt_hdr *nd_opt_array[__ND_OPT_ARRAY_MAX]; |
166 | #ifdef CONFIG_IPV6_ROUTE_INFO | |
167 | struct nd_opt_hdr *nd_opts_ri; | |
168 | struct nd_opt_hdr *nd_opts_ri_end; | |
169 | #endif | |
31910575 PY |
170 | struct nd_opt_hdr *nd_useropts; |
171 | struct nd_opt_hdr *nd_useropts_end; | |
1da177e4 LT |
172 | }; |
173 | ||
174 | #define nd_opts_src_lladdr nd_opt_array[ND_OPT_SOURCE_LL_ADDR] | |
175 | #define nd_opts_tgt_lladdr nd_opt_array[ND_OPT_TARGET_LL_ADDR] | |
176 | #define nd_opts_pi nd_opt_array[ND_OPT_PREFIX_INFO] | |
177 | #define nd_opts_pi_end nd_opt_array[__ND_OPT_PREFIX_INFO_END] | |
178 | #define nd_opts_rh nd_opt_array[ND_OPT_REDIRECT_HDR] | |
179 | #define nd_opts_mtu nd_opt_array[ND_OPT_MTU] | |
180 | ||
181 | #define NDISC_OPT_SPACE(len) (((len)+2+7)&~7) | |
182 | ||
183 | /* | |
184 | * Return the padding between the option length and the start of the | |
185 | * link addr. Currently only IP-over-InfiniBand needs this, although | |
186 | * if RFC 3831 IPv6-over-Fibre Channel is ever implemented it may | |
187 | * also need a pad of 2. | |
188 | */ | |
189 | static int ndisc_addr_option_pad(unsigned short type) | |
190 | { | |
191 | switch (type) { | |
192 | case ARPHRD_INFINIBAND: return 2; | |
193 | default: return 0; | |
194 | } | |
195 | } | |
196 | ||
197 | static inline int ndisc_opt_addr_space(struct net_device *dev) | |
198 | { | |
199 | return NDISC_OPT_SPACE(dev->addr_len + ndisc_addr_option_pad(dev->type)); | |
200 | } | |
201 | ||
202 | static u8 *ndisc_fill_addr_option(u8 *opt, int type, void *data, int data_len, | |
203 | unsigned short addr_type) | |
204 | { | |
205 | int space = NDISC_OPT_SPACE(data_len); | |
206 | int pad = ndisc_addr_option_pad(addr_type); | |
207 | ||
208 | opt[0] = type; | |
209 | opt[1] = space>>3; | |
210 | ||
211 | memset(opt + 2, 0, pad); | |
212 | opt += pad; | |
213 | space -= pad; | |
214 | ||
215 | memcpy(opt+2, data, data_len); | |
216 | data_len += 2; | |
217 | opt += data_len; | |
218 | if ((space -= data_len) > 0) | |
219 | memset(opt, 0, space); | |
220 | return opt + space; | |
221 | } | |
222 | ||
223 | static struct nd_opt_hdr *ndisc_next_option(struct nd_opt_hdr *cur, | |
224 | struct nd_opt_hdr *end) | |
225 | { | |
226 | int type; | |
227 | if (!cur || !end || cur >= end) | |
228 | return NULL; | |
229 | type = cur->nd_opt_type; | |
230 | do { | |
231 | cur = ((void *)cur) + (cur->nd_opt_len << 3); | |
232 | } while(cur < end && cur->nd_opt_type != type); | |
a02cec21 | 233 | return cur <= end && cur->nd_opt_type == type ? cur : NULL; |
1da177e4 LT |
234 | } |
235 | ||
31910575 PY |
236 | static inline int ndisc_is_useropt(struct nd_opt_hdr *opt) |
237 | { | |
a02cec21 | 238 | return opt->nd_opt_type == ND_OPT_RDNSS; |
31910575 PY |
239 | } |
240 | ||
241 | static struct nd_opt_hdr *ndisc_next_useropt(struct nd_opt_hdr *cur, | |
242 | struct nd_opt_hdr *end) | |
243 | { | |
244 | if (!cur || !end || cur >= end) | |
245 | return NULL; | |
246 | do { | |
247 | cur = ((void *)cur) + (cur->nd_opt_len << 3); | |
248 | } while(cur < end && !ndisc_is_useropt(cur)); | |
a02cec21 | 249 | return cur <= end && ndisc_is_useropt(cur) ? cur : NULL; |
31910575 PY |
250 | } |
251 | ||
1da177e4 LT |
252 | static struct ndisc_options *ndisc_parse_options(u8 *opt, int opt_len, |
253 | struct ndisc_options *ndopts) | |
254 | { | |
255 | struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)opt; | |
256 | ||
257 | if (!nd_opt || opt_len < 0 || !ndopts) | |
258 | return NULL; | |
259 | memset(ndopts, 0, sizeof(*ndopts)); | |
260 | while (opt_len) { | |
261 | int l; | |
262 | if (opt_len < sizeof(struct nd_opt_hdr)) | |
263 | return NULL; | |
264 | l = nd_opt->nd_opt_len << 3; | |
265 | if (opt_len < l || l == 0) | |
266 | return NULL; | |
267 | switch (nd_opt->nd_opt_type) { | |
268 | case ND_OPT_SOURCE_LL_ADDR: | |
269 | case ND_OPT_TARGET_LL_ADDR: | |
270 | case ND_OPT_MTU: | |
271 | case ND_OPT_REDIRECT_HDR: | |
272 | if (ndopts->nd_opt_array[nd_opt->nd_opt_type]) { | |
273 | ND_PRINTK2(KERN_WARNING | |
274 | "%s(): duplicated ND6 option found: type=%d\n", | |
0dc47877 | 275 | __func__, |
1da177e4 LT |
276 | nd_opt->nd_opt_type); |
277 | } else { | |
278 | ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt; | |
279 | } | |
280 | break; | |
281 | case ND_OPT_PREFIX_INFO: | |
282 | ndopts->nd_opts_pi_end = nd_opt; | |
cfcabdcc | 283 | if (!ndopts->nd_opt_array[nd_opt->nd_opt_type]) |
1da177e4 LT |
284 | ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt; |
285 | break; | |
70ceb4f5 YH |
286 | #ifdef CONFIG_IPV6_ROUTE_INFO |
287 | case ND_OPT_ROUTE_INFO: | |
288 | ndopts->nd_opts_ri_end = nd_opt; | |
289 | if (!ndopts->nd_opts_ri) | |
290 | ndopts->nd_opts_ri = nd_opt; | |
291 | break; | |
292 | #endif | |
1da177e4 | 293 | default: |
31910575 PY |
294 | if (ndisc_is_useropt(nd_opt)) { |
295 | ndopts->nd_useropts_end = nd_opt; | |
296 | if (!ndopts->nd_useropts) | |
297 | ndopts->nd_useropts = nd_opt; | |
298 | } else { | |
299 | /* | |
300 | * Unknown options must be silently ignored, | |
301 | * to accommodate future extension to the | |
302 | * protocol. | |
303 | */ | |
304 | ND_PRINTK2(KERN_NOTICE | |
305 | "%s(): ignored unsupported option; type=%d, len=%d\n", | |
0dc47877 | 306 | __func__, |
31910575 PY |
307 | nd_opt->nd_opt_type, nd_opt->nd_opt_len); |
308 | } | |
1da177e4 LT |
309 | } |
310 | opt_len -= l; | |
311 | nd_opt = ((void *)nd_opt) + l; | |
312 | } | |
313 | return ndopts; | |
314 | } | |
315 | ||
316 | static inline u8 *ndisc_opt_addr_data(struct nd_opt_hdr *p, | |
317 | struct net_device *dev) | |
318 | { | |
319 | u8 *lladdr = (u8 *)(p + 1); | |
320 | int lladdrlen = p->nd_opt_len << 3; | |
321 | int prepad = ndisc_addr_option_pad(dev->type); | |
322 | if (lladdrlen != NDISC_OPT_SPACE(dev->addr_len + prepad)) | |
323 | return NULL; | |
a02cec21 | 324 | return lladdr + prepad; |
1da177e4 LT |
325 | } |
326 | ||
327 | int ndisc_mc_map(struct in6_addr *addr, char *buf, struct net_device *dev, int dir) | |
328 | { | |
329 | switch (dev->type) { | |
330 | case ARPHRD_ETHER: | |
331 | case ARPHRD_IEEE802: /* Not sure. Check it later. --ANK */ | |
332 | case ARPHRD_FDDI: | |
333 | ipv6_eth_mc_map(addr, buf); | |
334 | return 0; | |
335 | case ARPHRD_IEEE802_TR: | |
336 | ipv6_tr_mc_map(addr,buf); | |
337 | return 0; | |
338 | case ARPHRD_ARCNET: | |
339 | ipv6_arcnet_mc_map(addr, buf); | |
340 | return 0; | |
341 | case ARPHRD_INFINIBAND: | |
a9e527e3 | 342 | ipv6_ib_mc_map(addr, dev->broadcast, buf); |
1da177e4 | 343 | return 0; |
93ca3bb5 TT |
344 | case ARPHRD_IPGRE: |
345 | return ipv6_ipgre_mc_map(addr, dev->broadcast, buf); | |
1da177e4 LT |
346 | default: |
347 | if (dir) { | |
348 | memcpy(buf, dev->broadcast, dev->addr_len); | |
349 | return 0; | |
350 | } | |
351 | } | |
352 | return -EINVAL; | |
353 | } | |
354 | ||
7159039a YH |
355 | EXPORT_SYMBOL(ndisc_mc_map); |
356 | ||
d6bf7817 ED |
357 | static u32 ndisc_hash(const void *pkey, |
358 | const struct net_device *dev, | |
359 | __u32 hash_rnd) | |
1da177e4 LT |
360 | { |
361 | const u32 *p32 = pkey; | |
362 | u32 addr_hash, i; | |
363 | ||
364 | addr_hash = 0; | |
365 | for (i = 0; i < (sizeof(struct in6_addr) / sizeof(u32)); i++) | |
366 | addr_hash ^= *p32++; | |
367 | ||
d6bf7817 | 368 | return jhash_2words(addr_hash, dev->ifindex, hash_rnd); |
1da177e4 LT |
369 | } |
370 | ||
371 | static int ndisc_constructor(struct neighbour *neigh) | |
372 | { | |
373 | struct in6_addr *addr = (struct in6_addr*)&neigh->primary_key; | |
374 | struct net_device *dev = neigh->dev; | |
375 | struct inet6_dev *in6_dev; | |
376 | struct neigh_parms *parms; | |
377 | int is_multicast = ipv6_addr_is_multicast(addr); | |
378 | ||
379 | rcu_read_lock(); | |
380 | in6_dev = in6_dev_get(dev); | |
381 | if (in6_dev == NULL) { | |
382 | rcu_read_unlock(); | |
383 | return -EINVAL; | |
384 | } | |
385 | ||
386 | parms = in6_dev->nd_parms; | |
387 | __neigh_parms_put(neigh->parms); | |
388 | neigh->parms = neigh_parms_clone(parms); | |
389 | rcu_read_unlock(); | |
390 | ||
391 | neigh->type = is_multicast ? RTN_MULTICAST : RTN_UNICAST; | |
3b04ddde | 392 | if (!dev->header_ops) { |
1da177e4 LT |
393 | neigh->nud_state = NUD_NOARP; |
394 | neigh->ops = &ndisc_direct_ops; | |
395 | neigh->output = neigh->ops->queue_xmit; | |
396 | } else { | |
397 | if (is_multicast) { | |
398 | neigh->nud_state = NUD_NOARP; | |
399 | ndisc_mc_map(addr, neigh->ha, dev, 1); | |
400 | } else if (dev->flags&(IFF_NOARP|IFF_LOOPBACK)) { | |
401 | neigh->nud_state = NUD_NOARP; | |
402 | memcpy(neigh->ha, dev->dev_addr, dev->addr_len); | |
403 | if (dev->flags&IFF_LOOPBACK) | |
404 | neigh->type = RTN_LOCAL; | |
405 | } else if (dev->flags&IFF_POINTOPOINT) { | |
406 | neigh->nud_state = NUD_NOARP; | |
407 | memcpy(neigh->ha, dev->broadcast, dev->addr_len); | |
408 | } | |
3b04ddde | 409 | if (dev->header_ops->cache) |
1da177e4 LT |
410 | neigh->ops = &ndisc_hh_ops; |
411 | else | |
412 | neigh->ops = &ndisc_generic_ops; | |
413 | if (neigh->nud_state&NUD_VALID) | |
414 | neigh->output = neigh->ops->connected_output; | |
415 | else | |
416 | neigh->output = neigh->ops->output; | |
417 | } | |
418 | in6_dev_put(in6_dev); | |
419 | return 0; | |
420 | } | |
421 | ||
422 | static int pndisc_constructor(struct pneigh_entry *n) | |
423 | { | |
424 | struct in6_addr *addr = (struct in6_addr*)&n->key; | |
425 | struct in6_addr maddr; | |
426 | struct net_device *dev = n->dev; | |
427 | ||
428 | if (dev == NULL || __in6_dev_get(dev) == NULL) | |
429 | return -EINVAL; | |
430 | addrconf_addr_solict_mult(addr, &maddr); | |
431 | ipv6_dev_mc_inc(dev, &maddr); | |
432 | return 0; | |
433 | } | |
434 | ||
435 | static void pndisc_destructor(struct pneigh_entry *n) | |
436 | { | |
437 | struct in6_addr *addr = (struct in6_addr*)&n->key; | |
438 | struct in6_addr maddr; | |
439 | struct net_device *dev = n->dev; | |
440 | ||
441 | if (dev == NULL || __in6_dev_get(dev) == NULL) | |
442 | return; | |
443 | addrconf_addr_solict_mult(addr, &maddr); | |
444 | ipv6_dev_mc_dec(dev, &maddr); | |
445 | } | |
446 | ||
305d552a BH |
447 | struct sk_buff *ndisc_build_skb(struct net_device *dev, |
448 | const struct in6_addr *daddr, | |
449 | const struct in6_addr *saddr, | |
450 | struct icmp6hdr *icmp6h, | |
451 | const struct in6_addr *target, | |
452 | int llinfo) | |
1da177e4 | 453 | { |
c346dca1 | 454 | struct net *net = dev_net(dev); |
1762f7e8 | 455 | struct sock *sk = net->ipv6.ndisc_sk; |
1ab1457c | 456 | struct sk_buff *skb; |
e1ec7842 | 457 | struct icmp6hdr *hdr; |
e1ec7842 | 458 | int len; |
1da177e4 | 459 | int err; |
305d552a | 460 | u8 *opt; |
1da177e4 | 461 | |
e1ec7842 YH |
462 | if (!dev->addr_len) |
463 | llinfo = 0; | |
464 | ||
465 | len = sizeof(struct icmp6hdr) + (target ? sizeof(*target) : 0); | |
466 | if (llinfo) | |
467 | len += ndisc_opt_addr_space(dev); | |
1da177e4 | 468 | |
d54a81d3 DM |
469 | skb = sock_alloc_send_skb(sk, |
470 | (MAX_HEADER + sizeof(struct ipv6hdr) + | |
f5184d26 | 471 | len + LL_ALLOCATED_SPACE(dev)), |
1da177e4 | 472 | 1, &err); |
e1ec7842 | 473 | if (!skb) { |
1da177e4 | 474 | ND_PRINTK0(KERN_ERR |
dae9de8e BH |
475 | "ICMPv6 ND: %s() failed to allocate an skb, err=%d.\n", |
476 | __func__, err); | |
305d552a | 477 | return NULL; |
1da177e4 LT |
478 | } |
479 | ||
480 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); | |
e1ec7842 | 481 | ip6_nd_hdr(sk, skb, dev, saddr, daddr, IPPROTO_ICMPV6, len); |
1da177e4 | 482 | |
27a884dc | 483 | skb->transport_header = skb->tail; |
d10ba34b | 484 | skb_put(skb, len); |
1da177e4 | 485 | |
e1ec7842 YH |
486 | hdr = (struct icmp6hdr *)skb_transport_header(skb); |
487 | memcpy(hdr, icmp6h, sizeof(*hdr)); | |
1da177e4 | 488 | |
e1ec7842 YH |
489 | opt = skb_transport_header(skb) + sizeof(struct icmp6hdr); |
490 | if (target) { | |
491 | ipv6_addr_copy((struct in6_addr *)opt, target); | |
492 | opt += sizeof(*target); | |
493 | } | |
1da177e4 | 494 | |
e1ec7842 YH |
495 | if (llinfo) |
496 | ndisc_fill_addr_option(opt, llinfo, dev->dev_addr, | |
1da177e4 LT |
497 | dev->addr_len, dev->type); |
498 | ||
e1ec7842 YH |
499 | hdr->icmp6_cksum = csum_ipv6_magic(saddr, daddr, len, |
500 | IPPROTO_ICMPV6, | |
07f0757a | 501 | csum_partial(hdr, |
e1ec7842 | 502 | len, 0)); |
1da177e4 | 503 | |
305d552a BH |
504 | return skb; |
505 | } | |
506 | ||
507 | EXPORT_SYMBOL(ndisc_build_skb); | |
508 | ||
509 | void ndisc_send_skb(struct sk_buff *skb, | |
510 | struct net_device *dev, | |
511 | struct neighbour *neigh, | |
512 | const struct in6_addr *daddr, | |
513 | const struct in6_addr *saddr, | |
514 | struct icmp6hdr *icmp6h) | |
515 | { | |
4c9483b2 | 516 | struct flowi6 fl6; |
305d552a BH |
517 | struct dst_entry *dst; |
518 | struct net *net = dev_net(dev); | |
519 | struct sock *sk = net->ipv6.ndisc_sk; | |
520 | struct inet6_dev *idev; | |
521 | int err; | |
522 | u8 type; | |
523 | ||
524 | type = icmp6h->icmp6_type; | |
525 | ||
4c9483b2 | 526 | icmpv6_flow_init(sk, &fl6, type, saddr, daddr, dev->ifindex); |
305d552a BH |
527 | |
528 | dst = icmp6_dst_alloc(dev, neigh, daddr); | |
529 | if (!dst) { | |
530 | kfree_skb(skb); | |
531 | return; | |
532 | } | |
533 | ||
4c9483b2 | 534 | dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), NULL, 0); |
452edd59 | 535 | if (IS_ERR(dst)) { |
305d552a BH |
536 | kfree_skb(skb); |
537 | return; | |
538 | } | |
539 | ||
adf30907 | 540 | skb_dst_set(skb, dst); |
e1ec7842 | 541 | |
1da177e4 | 542 | idev = in6_dev_get(dst->dev); |
edf391ff | 543 | IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len); |
e1ec7842 | 544 | |
b2e0b385 | 545 | err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, dst->dev, |
6e23ae2a | 546 | dst_output); |
1da177e4 | 547 | if (!err) { |
5c5d244b | 548 | ICMP6MSGOUT_INC_STATS(net, idev, type); |
a862f6a6 | 549 | ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); |
1da177e4 LT |
550 | } |
551 | ||
552 | if (likely(idev != NULL)) | |
553 | in6_dev_put(idev); | |
1ab1457c | 554 | } |
1da177e4 | 555 | |
305d552a BH |
556 | EXPORT_SYMBOL(ndisc_send_skb); |
557 | ||
558 | /* | |
559 | * Send a Neighbour Discover packet | |
560 | */ | |
561 | static void __ndisc_send(struct net_device *dev, | |
562 | struct neighbour *neigh, | |
563 | const struct in6_addr *daddr, | |
564 | const struct in6_addr *saddr, | |
565 | struct icmp6hdr *icmp6h, const struct in6_addr *target, | |
566 | int llinfo) | |
567 | { | |
568 | struct sk_buff *skb; | |
569 | ||
570 | skb = ndisc_build_skb(dev, daddr, saddr, icmp6h, target, llinfo); | |
571 | if (!skb) | |
572 | return; | |
573 | ||
574 | ndisc_send_skb(skb, dev, neigh, daddr, saddr, icmp6h); | |
575 | } | |
576 | ||
e1ec7842 | 577 | static void ndisc_send_na(struct net_device *dev, struct neighbour *neigh, |
9acd9f3a YH |
578 | const struct in6_addr *daddr, |
579 | const struct in6_addr *solicited_addr, | |
580 | int router, int solicited, int override, int inc_opt) | |
e1ec7842 YH |
581 | { |
582 | struct in6_addr tmpaddr; | |
583 | struct inet6_ifaddr *ifp; | |
9acd9f3a | 584 | const struct in6_addr *src_addr; |
e1ec7842 YH |
585 | struct icmp6hdr icmp6h = { |
586 | .icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT, | |
587 | }; | |
588 | ||
589 | /* for anycast or proxy, solicited_addr != src_addr */ | |
c346dca1 | 590 | ifp = ipv6_get_ifaddr(dev_net(dev), solicited_addr, dev, 1); |
e1ec7842 YH |
591 | if (ifp) { |
592 | src_addr = solicited_addr; | |
593 | if (ifp->flags & IFA_F_OPTIMISTIC) | |
594 | override = 0; | |
9f888160 | 595 | inc_opt |= ifp->idev->cnf.force_tllao; |
e1ec7842 YH |
596 | in6_ifa_put(ifp); |
597 | } else { | |
191cd582 | 598 | if (ipv6_dev_get_saddr(dev_net(dev), dev, daddr, |
c346dca1 | 599 | inet6_sk(dev_net(dev)->ipv6.ndisc_sk)->srcprefs, |
7cbca67c | 600 | &tmpaddr)) |
e1ec7842 YH |
601 | return; |
602 | src_addr = &tmpaddr; | |
603 | } | |
604 | ||
605 | icmp6h.icmp6_router = router; | |
606 | icmp6h.icmp6_solicited = solicited; | |
607 | icmp6h.icmp6_override = override; | |
608 | ||
609 | __ndisc_send(dev, neigh, daddr, src_addr, | |
610 | &icmp6h, solicited_addr, | |
14878f75 | 611 | inc_opt ? ND_OPT_TARGET_LL_ADDR : 0); |
e1ec7842 YH |
612 | } |
613 | ||
1da177e4 | 614 | void ndisc_send_ns(struct net_device *dev, struct neighbour *neigh, |
9acd9f3a YH |
615 | const struct in6_addr *solicit, |
616 | const struct in6_addr *daddr, const struct in6_addr *saddr) | |
1da177e4 | 617 | { |
1da177e4 | 618 | struct in6_addr addr_buf; |
e1ec7842 YH |
619 | struct icmp6hdr icmp6h = { |
620 | .icmp6_type = NDISC_NEIGHBOUR_SOLICITATION, | |
621 | }; | |
1da177e4 LT |
622 | |
623 | if (saddr == NULL) { | |
95c385b4 NH |
624 | if (ipv6_get_lladdr(dev, &addr_buf, |
625 | (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC))) | |
1da177e4 LT |
626 | return; |
627 | saddr = &addr_buf; | |
628 | } | |
629 | ||
e1ec7842 YH |
630 | __ndisc_send(dev, neigh, daddr, saddr, |
631 | &icmp6h, solicit, | |
14878f75 | 632 | !ipv6_addr_any(saddr) ? ND_OPT_SOURCE_LL_ADDR : 0); |
1da177e4 LT |
633 | } |
634 | ||
9acd9f3a YH |
635 | void ndisc_send_rs(struct net_device *dev, const struct in6_addr *saddr, |
636 | const struct in6_addr *daddr) | |
1da177e4 | 637 | { |
e1ec7842 YH |
638 | struct icmp6hdr icmp6h = { |
639 | .icmp6_type = NDISC_ROUTER_SOLICITATION, | |
640 | }; | |
95c385b4 | 641 | int send_sllao = dev->addr_len; |
95c385b4 NH |
642 | |
643 | #ifdef CONFIG_IPV6_OPTIMISTIC_DAD | |
644 | /* | |
645 | * According to section 2.2 of RFC 4429, we must not | |
646 | * send router solicitations with a sllao from | |
647 | * optimistic addresses, but we may send the solicitation | |
648 | * if we don't include the sllao. So here we check | |
649 | * if our address is optimistic, and if so, we | |
bea85195 | 650 | * suppress the inclusion of the sllao. |
95c385b4 NH |
651 | */ |
652 | if (send_sllao) { | |
c346dca1 | 653 | struct inet6_ifaddr *ifp = ipv6_get_ifaddr(dev_net(dev), saddr, |
1cab3da6 | 654 | dev, 1); |
95c385b4 NH |
655 | if (ifp) { |
656 | if (ifp->flags & IFA_F_OPTIMISTIC) { | |
ca043569 | 657 | send_sllao = 0; |
95c385b4 | 658 | } |
ca043569 | 659 | in6_ifa_put(ifp); |
95c385b4 NH |
660 | } else { |
661 | send_sllao = 0; | |
662 | } | |
663 | } | |
664 | #endif | |
e1ec7842 YH |
665 | __ndisc_send(dev, NULL, daddr, saddr, |
666 | &icmp6h, NULL, | |
14878f75 | 667 | send_sllao ? ND_OPT_SOURCE_LL_ADDR : 0); |
1da177e4 | 668 | } |
1ab1457c | 669 | |
1da177e4 LT |
670 | |
671 | static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb) | |
672 | { | |
673 | /* | |
674 | * "The sender MUST return an ICMP | |
675 | * destination unreachable" | |
676 | */ | |
677 | dst_link_failure(skb); | |
678 | kfree_skb(skb); | |
679 | } | |
680 | ||
681 | /* Called with locked neigh: either read or both */ | |
682 | ||
683 | static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb) | |
684 | { | |
685 | struct in6_addr *saddr = NULL; | |
686 | struct in6_addr mcaddr; | |
687 | struct net_device *dev = neigh->dev; | |
688 | struct in6_addr *target = (struct in6_addr *)&neigh->primary_key; | |
689 | int probes = atomic_read(&neigh->probes); | |
690 | ||
c346dca1 | 691 | if (skb && ipv6_chk_addr(dev_net(dev), &ipv6_hdr(skb)->saddr, dev, 1)) |
0660e03f | 692 | saddr = &ipv6_hdr(skb)->saddr; |
1da177e4 LT |
693 | |
694 | if ((probes -= neigh->parms->ucast_probes) < 0) { | |
695 | if (!(neigh->nud_state & NUD_VALID)) { | |
5b095d98 | 696 | ND_PRINTK1(KERN_DEBUG "%s(): trying to ucast probe in NUD_INVALID: %pI6\n", |
0c6ce78a | 697 | __func__, target); |
1da177e4 LT |
698 | } |
699 | ndisc_send_ns(dev, neigh, target, target, saddr); | |
700 | } else if ((probes -= neigh->parms->app_probes) < 0) { | |
701 | #ifdef CONFIG_ARPD | |
702 | neigh_app_ns(neigh); | |
703 | #endif | |
704 | } else { | |
705 | addrconf_addr_solict_mult(target, &mcaddr); | |
706 | ndisc_send_ns(dev, NULL, target, &mcaddr, saddr); | |
707 | } | |
708 | } | |
709 | ||
0736ffc0 YH |
710 | static int pndisc_is_router(const void *pkey, |
711 | struct net_device *dev) | |
fa86d322 PE |
712 | { |
713 | struct pneigh_entry *n; | |
0736ffc0 | 714 | int ret = -1; |
fa86d322 PE |
715 | |
716 | read_lock_bh(&nd_tbl.lock); | |
0736ffc0 YH |
717 | n = __pneigh_lookup(&nd_tbl, dev_net(dev), pkey, dev); |
718 | if (n) | |
719 | ret = !!(n->flags & NTF_ROUTER); | |
fa86d322 PE |
720 | read_unlock_bh(&nd_tbl.lock); |
721 | ||
0736ffc0 | 722 | return ret; |
fa86d322 PE |
723 | } |
724 | ||
1da177e4 LT |
725 | static void ndisc_recv_ns(struct sk_buff *skb) |
726 | { | |
9c70220b | 727 | struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb); |
0660e03f ACM |
728 | struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; |
729 | struct in6_addr *daddr = &ipv6_hdr(skb)->daddr; | |
1da177e4 | 730 | u8 *lladdr = NULL; |
27a884dc ACM |
731 | u32 ndoptlen = skb->tail - (skb->transport_header + |
732 | offsetof(struct nd_msg, opt)); | |
1da177e4 LT |
733 | struct ndisc_options ndopts; |
734 | struct net_device *dev = skb->dev; | |
735 | struct inet6_ifaddr *ifp; | |
736 | struct inet6_dev *idev = NULL; | |
737 | struct neighbour *neigh; | |
738 | int dad = ipv6_addr_any(saddr); | |
739 | int inc; | |
0736ffc0 | 740 | int is_router = -1; |
1da177e4 LT |
741 | |
742 | if (ipv6_addr_is_multicast(&msg->target)) { | |
1ab1457c | 743 | ND_PRINTK2(KERN_WARNING |
1da177e4 LT |
744 | "ICMPv6 NS: multicast target address"); |
745 | return; | |
746 | } | |
747 | ||
748 | /* | |
749 | * RFC2461 7.1.1: | |
750 | * DAD has to be destined for solicited node multicast address. | |
751 | */ | |
752 | if (dad && | |
753 | !(daddr->s6_addr32[0] == htonl(0xff020000) && | |
754 | daddr->s6_addr32[1] == htonl(0x00000000) && | |
755 | daddr->s6_addr32[2] == htonl(0x00000001) && | |
756 | daddr->s6_addr [12] == 0xff )) { | |
757 | ND_PRINTK2(KERN_WARNING | |
758 | "ICMPv6 NS: bad DAD packet (wrong destination)\n"); | |
759 | return; | |
760 | } | |
761 | ||
762 | if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) { | |
1ab1457c | 763 | ND_PRINTK2(KERN_WARNING |
1da177e4 LT |
764 | "ICMPv6 NS: invalid ND options\n"); |
765 | return; | |
766 | } | |
767 | ||
768 | if (ndopts.nd_opts_src_lladdr) { | |
769 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, dev); | |
770 | if (!lladdr) { | |
771 | ND_PRINTK2(KERN_WARNING | |
772 | "ICMPv6 NS: invalid link-layer address length\n"); | |
773 | return; | |
774 | } | |
775 | ||
776 | /* RFC2461 7.1.1: | |
1ab1457c YH |
777 | * If the IP source address is the unspecified address, |
778 | * there MUST NOT be source link-layer address option | |
1da177e4 LT |
779 | * in the message. |
780 | */ | |
781 | if (dad) { | |
1ab1457c | 782 | ND_PRINTK2(KERN_WARNING |
1da177e4 LT |
783 | "ICMPv6 NS: bad DAD packet (link-layer address option)\n"); |
784 | return; | |
785 | } | |
786 | } | |
787 | ||
788 | inc = ipv6_addr_is_multicast(daddr); | |
789 | ||
c346dca1 | 790 | ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1); |
a18bc695 | 791 | if (ifp) { |
95c385b4 NH |
792 | |
793 | if (ifp->flags & (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC)) { | |
794 | if (dad) { | |
795 | if (dev->type == ARPHRD_IEEE802_TR) { | |
98e399f8 ACM |
796 | const unsigned char *sadr; |
797 | sadr = skb_mac_header(skb); | |
95c385b4 NH |
798 | if (((sadr[8] ^ dev->dev_addr[0]) & 0x7f) == 0 && |
799 | sadr[9] == dev->dev_addr[1] && | |
800 | sadr[10] == dev->dev_addr[2] && | |
801 | sadr[11] == dev->dev_addr[3] && | |
802 | sadr[12] == dev->dev_addr[4] && | |
803 | sadr[13] == dev->dev_addr[5]) { | |
804 | /* looped-back to us */ | |
805 | goto out; | |
806 | } | |
807 | } | |
808 | ||
809 | /* | |
810 | * We are colliding with another node | |
811 | * who is doing DAD | |
812 | * so fail our DAD process | |
813 | */ | |
814 | addrconf_dad_failure(ifp); | |
9e3be4b3 | 815 | return; |
95c385b4 NH |
816 | } else { |
817 | /* | |
818 | * This is not a dad solicitation. | |
819 | * If we are an optimistic node, | |
820 | * we should respond. | |
821 | * Otherwise, we should ignore it. | |
822 | */ | |
823 | if (!(ifp->flags & IFA_F_OPTIMISTIC)) | |
1da177e4 | 824 | goto out; |
1da177e4 | 825 | } |
1da177e4 LT |
826 | } |
827 | ||
828 | idev = ifp->idev; | |
829 | } else { | |
53b7997f YH |
830 | struct net *net = dev_net(dev); |
831 | ||
1da177e4 LT |
832 | idev = in6_dev_get(dev); |
833 | if (!idev) { | |
834 | /* XXX: count this drop? */ | |
835 | return; | |
836 | } | |
837 | ||
53b7997f | 838 | if (ipv6_chk_acast_addr(net, dev, &msg->target) || |
1ab1457c | 839 | (idev->cnf.forwarding && |
53b7997f | 840 | (net->ipv6.devconf_all->proxy_ndp || idev->cnf.proxy_ndp) && |
0736ffc0 | 841 | (is_router = pndisc_is_router(&msg->target, dev)) >= 0)) { |
a61bbcf2 | 842 | if (!(NEIGH_CB(skb)->flags & LOCALLY_ENQUEUED) && |
1da177e4 LT |
843 | skb->pkt_type != PACKET_HOST && |
844 | inc != 0 && | |
845 | idev->nd_parms->proxy_delay != 0) { | |
846 | /* | |
847 | * for anycast or proxy, | |
1ab1457c YH |
848 | * sender should delay its response |
849 | * by a random time between 0 and | |
1da177e4 LT |
850 | * MAX_ANYCAST_DELAY_TIME seconds. |
851 | * (RFC2461) -- yoshfuji | |
852 | */ | |
853 | struct sk_buff *n = skb_clone(skb, GFP_ATOMIC); | |
854 | if (n) | |
855 | pneigh_enqueue(&nd_tbl, idev->nd_parms, n); | |
856 | goto out; | |
857 | } | |
858 | } else | |
859 | goto out; | |
860 | } | |
861 | ||
0736ffc0 YH |
862 | if (is_router < 0) |
863 | is_router = !!idev->cnf.forwarding; | |
62dd9318 | 864 | |
1da177e4 | 865 | if (dad) { |
f3ee4010 | 866 | ndisc_send_na(dev, NULL, &in6addr_linklocal_allnodes, &msg->target, |
62dd9318 | 867 | is_router, 0, (ifp != NULL), 1); |
1da177e4 LT |
868 | goto out; |
869 | } | |
870 | ||
871 | if (inc) | |
872 | NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_mcast); | |
873 | else | |
874 | NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_ucast); | |
875 | ||
1ab1457c | 876 | /* |
1da177e4 LT |
877 | * update / create cache entry |
878 | * for the source address | |
879 | */ | |
880 | neigh = __neigh_lookup(&nd_tbl, saddr, dev, | |
881 | !inc || lladdr || !dev->addr_len); | |
882 | if (neigh) | |
1ab1457c | 883 | neigh_update(neigh, lladdr, NUD_STALE, |
1da177e4 LT |
884 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
885 | NEIGH_UPDATE_F_OVERRIDE); | |
3b04ddde | 886 | if (neigh || !dev->header_ops) { |
1da177e4 | 887 | ndisc_send_na(dev, neigh, saddr, &msg->target, |
62dd9318 | 888 | is_router, |
1da177e4 LT |
889 | 1, (ifp != NULL && inc), inc); |
890 | if (neigh) | |
891 | neigh_release(neigh); | |
892 | } | |
893 | ||
894 | out: | |
895 | if (ifp) | |
896 | in6_ifa_put(ifp); | |
897 | else | |
898 | in6_dev_put(idev); | |
1da177e4 LT |
899 | } |
900 | ||
901 | static void ndisc_recv_na(struct sk_buff *skb) | |
902 | { | |
9c70220b | 903 | struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb); |
0660e03f ACM |
904 | struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; |
905 | struct in6_addr *daddr = &ipv6_hdr(skb)->daddr; | |
1da177e4 | 906 | u8 *lladdr = NULL; |
27a884dc ACM |
907 | u32 ndoptlen = skb->tail - (skb->transport_header + |
908 | offsetof(struct nd_msg, opt)); | |
1da177e4 LT |
909 | struct ndisc_options ndopts; |
910 | struct net_device *dev = skb->dev; | |
911 | struct inet6_ifaddr *ifp; | |
912 | struct neighbour *neigh; | |
913 | ||
914 | if (skb->len < sizeof(struct nd_msg)) { | |
915 | ND_PRINTK2(KERN_WARNING | |
916 | "ICMPv6 NA: packet too short\n"); | |
917 | return; | |
918 | } | |
919 | ||
920 | if (ipv6_addr_is_multicast(&msg->target)) { | |
921 | ND_PRINTK2(KERN_WARNING | |
922 | "ICMPv6 NA: target address is multicast.\n"); | |
923 | return; | |
924 | } | |
925 | ||
926 | if (ipv6_addr_is_multicast(daddr) && | |
927 | msg->icmph.icmp6_solicited) { | |
928 | ND_PRINTK2(KERN_WARNING | |
929 | "ICMPv6 NA: solicited NA is multicasted.\n"); | |
930 | return; | |
931 | } | |
1ab1457c | 932 | |
1da177e4 LT |
933 | if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) { |
934 | ND_PRINTK2(KERN_WARNING | |
935 | "ICMPv6 NS: invalid ND option\n"); | |
936 | return; | |
937 | } | |
938 | if (ndopts.nd_opts_tgt_lladdr) { | |
939 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, dev); | |
940 | if (!lladdr) { | |
941 | ND_PRINTK2(KERN_WARNING | |
942 | "ICMPv6 NA: invalid link-layer address length\n"); | |
943 | return; | |
944 | } | |
945 | } | |
c346dca1 | 946 | ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1); |
a18bc695 | 947 | if (ifp) { |
1da177e4 LT |
948 | if (ifp->flags & IFA_F_TENTATIVE) { |
949 | addrconf_dad_failure(ifp); | |
950 | return; | |
951 | } | |
952 | /* What should we make now? The advertisement | |
953 | is invalid, but ndisc specs say nothing | |
954 | about it. It could be misconfiguration, or | |
955 | an smart proxy agent tries to help us :-) | |
24fc7b86 JS |
956 | |
957 | We should not print the error if NA has been | |
958 | received from loopback - it is just our own | |
959 | unsolicited advertisement. | |
1da177e4 | 960 | */ |
24fc7b86 JS |
961 | if (skb->pkt_type != PACKET_LOOPBACK) |
962 | ND_PRINTK1(KERN_WARNING | |
a6fa3286 JR |
963 | "ICMPv6 NA: someone advertises our address %pI6 on %s!\n", |
964 | &ifp->addr, ifp->idev->dev->name); | |
1da177e4 LT |
965 | in6_ifa_put(ifp); |
966 | return; | |
967 | } | |
968 | neigh = neigh_lookup(&nd_tbl, &msg->target, dev); | |
969 | ||
970 | if (neigh) { | |
971 | u8 old_flags = neigh->flags; | |
53b7997f | 972 | struct net *net = dev_net(dev); |
1da177e4 LT |
973 | |
974 | if (neigh->nud_state & NUD_FAILED) | |
975 | goto out; | |
976 | ||
5f3e6e9e VN |
977 | /* |
978 | * Don't update the neighbor cache entry on a proxy NA from | |
979 | * ourselves because either the proxied node is off link or it | |
980 | * has already sent a NA to us. | |
981 | */ | |
982 | if (lladdr && !memcmp(lladdr, dev->dev_addr, dev->addr_len) && | |
53b7997f YH |
983 | net->ipv6.devconf_all->forwarding && net->ipv6.devconf_all->proxy_ndp && |
984 | pneigh_lookup(&nd_tbl, net, &msg->target, dev, 0)) { | |
fbea49e1 | 985 | /* XXX: idev->cnf.prixy_ndp */ |
5f3e6e9e | 986 | goto out; |
fbea49e1 | 987 | } |
5f3e6e9e | 988 | |
1da177e4 LT |
989 | neigh_update(neigh, lladdr, |
990 | msg->icmph.icmp6_solicited ? NUD_REACHABLE : NUD_STALE, | |
991 | NEIGH_UPDATE_F_WEAK_OVERRIDE| | |
992 | (msg->icmph.icmp6_override ? NEIGH_UPDATE_F_OVERRIDE : 0)| | |
993 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
994 | (msg->icmph.icmp6_router ? NEIGH_UPDATE_F_ISROUTER : 0)); | |
995 | ||
996 | if ((old_flags & ~neigh->flags) & NTF_ROUTER) { | |
997 | /* | |
998 | * Change: router to host | |
999 | */ | |
1000 | struct rt6_info *rt; | |
1001 | rt = rt6_get_dflt_router(saddr, dev); | |
1002 | if (rt) | |
e0a1ad73 | 1003 | ip6_del_rt(rt); |
1da177e4 LT |
1004 | } |
1005 | ||
1006 | out: | |
1007 | neigh_release(neigh); | |
1008 | } | |
1009 | } | |
1010 | ||
1011 | static void ndisc_recv_rs(struct sk_buff *skb) | |
1012 | { | |
9c70220b | 1013 | struct rs_msg *rs_msg = (struct rs_msg *)skb_transport_header(skb); |
1da177e4 LT |
1014 | unsigned long ndoptlen = skb->len - sizeof(*rs_msg); |
1015 | struct neighbour *neigh; | |
1016 | struct inet6_dev *idev; | |
0660e03f | 1017 | struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; |
1da177e4 LT |
1018 | struct ndisc_options ndopts; |
1019 | u8 *lladdr = NULL; | |
1020 | ||
1021 | if (skb->len < sizeof(*rs_msg)) | |
1022 | return; | |
1023 | ||
1024 | idev = in6_dev_get(skb->dev); | |
1025 | if (!idev) { | |
1026 | if (net_ratelimit()) | |
1027 | ND_PRINTK1("ICMP6 RS: can't find in6 device\n"); | |
1028 | return; | |
1029 | } | |
1030 | ||
1031 | /* Don't accept RS if we're not in router mode */ | |
1032 | if (!idev->cnf.forwarding) | |
1033 | goto out; | |
1034 | ||
1035 | /* | |
1036 | * Don't update NCE if src = ::; | |
1037 | * this implies that the source node has no ip address assigned yet. | |
1038 | */ | |
1039 | if (ipv6_addr_any(saddr)) | |
1040 | goto out; | |
1041 | ||
1042 | /* Parse ND options */ | |
1043 | if (!ndisc_parse_options(rs_msg->opt, ndoptlen, &ndopts)) { | |
1044 | if (net_ratelimit()) | |
1045 | ND_PRINTK2("ICMP6 NS: invalid ND option, ignored\n"); | |
1046 | goto out; | |
1047 | } | |
1048 | ||
1049 | if (ndopts.nd_opts_src_lladdr) { | |
1050 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, | |
1051 | skb->dev); | |
1052 | if (!lladdr) | |
1053 | goto out; | |
1054 | } | |
1055 | ||
1056 | neigh = __neigh_lookup(&nd_tbl, saddr, skb->dev, 1); | |
1057 | if (neigh) { | |
1058 | neigh_update(neigh, lladdr, NUD_STALE, | |
1059 | NEIGH_UPDATE_F_WEAK_OVERRIDE| | |
1060 | NEIGH_UPDATE_F_OVERRIDE| | |
1061 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER); | |
1062 | neigh_release(neigh); | |
1063 | } | |
1064 | out: | |
1065 | in6_dev_put(idev); | |
1066 | } | |
1067 | ||
31910575 PY |
1068 | static void ndisc_ra_useropt(struct sk_buff *ra, struct nd_opt_hdr *opt) |
1069 | { | |
1070 | struct icmp6hdr *icmp6h = (struct icmp6hdr *)skb_transport_header(ra); | |
1071 | struct sk_buff *skb; | |
1072 | struct nlmsghdr *nlh; | |
1073 | struct nduseroptmsg *ndmsg; | |
c346dca1 | 1074 | struct net *net = dev_net(ra->dev); |
31910575 PY |
1075 | int err; |
1076 | int base_size = NLMSG_ALIGN(sizeof(struct nduseroptmsg) | |
1077 | + (opt->nd_opt_len << 3)); | |
1078 | size_t msg_size = base_size + nla_total_size(sizeof(struct in6_addr)); | |
1079 | ||
1080 | skb = nlmsg_new(msg_size, GFP_ATOMIC); | |
1081 | if (skb == NULL) { | |
1082 | err = -ENOBUFS; | |
1083 | goto errout; | |
1084 | } | |
1085 | ||
1086 | nlh = nlmsg_put(skb, 0, 0, RTM_NEWNDUSEROPT, base_size, 0); | |
1087 | if (nlh == NULL) { | |
1088 | goto nla_put_failure; | |
1089 | } | |
1090 | ||
1091 | ndmsg = nlmsg_data(nlh); | |
1092 | ndmsg->nduseropt_family = AF_INET6; | |
dbb2ed24 | 1093 | ndmsg->nduseropt_ifindex = ra->dev->ifindex; |
31910575 PY |
1094 | ndmsg->nduseropt_icmp_type = icmp6h->icmp6_type; |
1095 | ndmsg->nduseropt_icmp_code = icmp6h->icmp6_code; | |
1096 | ndmsg->nduseropt_opts_len = opt->nd_opt_len << 3; | |
1097 | ||
1098 | memcpy(ndmsg + 1, opt, opt->nd_opt_len << 3); | |
1099 | ||
1100 | NLA_PUT(skb, NDUSEROPT_SRCADDR, sizeof(struct in6_addr), | |
1101 | &ipv6_hdr(ra)->saddr); | |
1102 | nlmsg_end(skb, nlh); | |
1103 | ||
1ce85fe4 | 1104 | rtnl_notify(skb, net, 0, RTNLGRP_ND_USEROPT, NULL, GFP_ATOMIC); |
31910575 PY |
1105 | return; |
1106 | ||
1107 | nla_put_failure: | |
1108 | nlmsg_free(skb); | |
1109 | err = -EMSGSIZE; | |
1110 | errout: | |
a18bc695 | 1111 | rtnl_set_sk_err(net, RTNLGRP_ND_USEROPT, err); |
31910575 PY |
1112 | } |
1113 | ||
65e9b62d TG |
1114 | static inline int accept_ra(struct inet6_dev *in6_dev) |
1115 | { | |
1116 | /* | |
1117 | * If forwarding is enabled, RA are not accepted unless the special | |
1118 | * hybrid mode (accept_ra=2) is enabled. | |
1119 | */ | |
1120 | if (in6_dev->cnf.forwarding && in6_dev->cnf.accept_ra < 2) | |
1121 | return 0; | |
1122 | ||
1123 | return in6_dev->cnf.accept_ra; | |
1124 | } | |
1125 | ||
1da177e4 LT |
1126 | static void ndisc_router_discovery(struct sk_buff *skb) |
1127 | { | |
9c70220b | 1128 | struct ra_msg *ra_msg = (struct ra_msg *)skb_transport_header(skb); |
1da177e4 LT |
1129 | struct neighbour *neigh = NULL; |
1130 | struct inet6_dev *in6_dev; | |
65f5c7c1 | 1131 | struct rt6_info *rt = NULL; |
1da177e4 LT |
1132 | int lifetime; |
1133 | struct ndisc_options ndopts; | |
1134 | int optlen; | |
ebacaaa0 | 1135 | unsigned int pref = 0; |
1da177e4 LT |
1136 | |
1137 | __u8 * opt = (__u8 *)(ra_msg + 1); | |
1138 | ||
27a884dc | 1139 | optlen = (skb->tail - skb->transport_header) - sizeof(struct ra_msg); |
1da177e4 | 1140 | |
0660e03f | 1141 | if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) { |
1da177e4 LT |
1142 | ND_PRINTK2(KERN_WARNING |
1143 | "ICMPv6 RA: source address is not link-local.\n"); | |
1144 | return; | |
1145 | } | |
1146 | if (optlen < 0) { | |
1ab1457c | 1147 | ND_PRINTK2(KERN_WARNING |
1da177e4 LT |
1148 | "ICMPv6 RA: packet too short\n"); |
1149 | return; | |
1150 | } | |
1151 | ||
de357cc0 | 1152 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 TF |
1153 | if (skb->ndisc_nodetype == NDISC_NODETYPE_HOST) { |
1154 | ND_PRINTK2(KERN_WARNING | |
1155 | "ICMPv6 RA: from host or unauthorized router\n"); | |
1156 | return; | |
1157 | } | |
de357cc0 | 1158 | #endif |
fadf6bf0 | 1159 | |
1da177e4 LT |
1160 | /* |
1161 | * set the RA_RECV flag in the interface | |
1162 | */ | |
1163 | ||
1164 | in6_dev = in6_dev_get(skb->dev); | |
1165 | if (in6_dev == NULL) { | |
1166 | ND_PRINTK0(KERN_ERR | |
1167 | "ICMPv6 RA: can't find inet6 device for %s.\n", | |
1168 | skb->dev->name); | |
1169 | return; | |
1170 | } | |
1da177e4 LT |
1171 | |
1172 | if (!ndisc_parse_options(opt, optlen, &ndopts)) { | |
1173 | in6_dev_put(in6_dev); | |
1174 | ND_PRINTK2(KERN_WARNING | |
1175 | "ICMP6 RA: invalid ND options\n"); | |
1176 | return; | |
1177 | } | |
1178 | ||
65e9b62d | 1179 | if (!accept_ra(in6_dev)) |
31ce8c71 DW |
1180 | goto skip_linkparms; |
1181 | ||
de357cc0 | 1182 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 TF |
1183 | /* skip link-specific parameters from interior routers */ |
1184 | if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT) | |
1185 | goto skip_linkparms; | |
de357cc0 | 1186 | #endif |
fadf6bf0 | 1187 | |
1da177e4 LT |
1188 | if (in6_dev->if_flags & IF_RS_SENT) { |
1189 | /* | |
1190 | * flag that an RA was received after an RS was sent | |
1191 | * out on this interface. | |
1192 | */ | |
1193 | in6_dev->if_flags |= IF_RA_RCVD; | |
1194 | } | |
1195 | ||
1196 | /* | |
1197 | * Remember the managed/otherconf flags from most recently | |
1198 | * received RA message (RFC 2462) -- yoshfuji | |
1199 | */ | |
1200 | in6_dev->if_flags = (in6_dev->if_flags & ~(IF_RA_MANAGED | | |
1201 | IF_RA_OTHERCONF)) | | |
1202 | (ra_msg->icmph.icmp6_addrconf_managed ? | |
1203 | IF_RA_MANAGED : 0) | | |
1204 | (ra_msg->icmph.icmp6_addrconf_other ? | |
1205 | IF_RA_OTHERCONF : 0); | |
1206 | ||
65f5c7c1 YH |
1207 | if (!in6_dev->cnf.accept_ra_defrtr) |
1208 | goto skip_defrtr; | |
1209 | ||
1da177e4 LT |
1210 | lifetime = ntohs(ra_msg->icmph.icmp6_rt_lifetime); |
1211 | ||
ebacaaa0 YH |
1212 | #ifdef CONFIG_IPV6_ROUTER_PREF |
1213 | pref = ra_msg->icmph.icmp6_router_pref; | |
1214 | /* 10b is handled as if it were 00b (medium) */ | |
930d6ff2 | 1215 | if (pref == ICMPV6_ROUTER_PREF_INVALID || |
6d5b78cd | 1216 | !in6_dev->cnf.accept_ra_rtr_pref) |
ebacaaa0 YH |
1217 | pref = ICMPV6_ROUTER_PREF_MEDIUM; |
1218 | #endif | |
1219 | ||
0660e03f | 1220 | rt = rt6_get_dflt_router(&ipv6_hdr(skb)->saddr, skb->dev); |
1da177e4 LT |
1221 | |
1222 | if (rt) | |
1223 | neigh = rt->rt6i_nexthop; | |
1224 | ||
1225 | if (rt && lifetime == 0) { | |
1226 | neigh_clone(neigh); | |
e0a1ad73 | 1227 | ip6_del_rt(rt); |
1da177e4 LT |
1228 | rt = NULL; |
1229 | } | |
1230 | ||
1231 | if (rt == NULL && lifetime) { | |
1232 | ND_PRINTK3(KERN_DEBUG | |
1233 | "ICMPv6 RA: adding default router.\n"); | |
1234 | ||
0660e03f | 1235 | rt = rt6_add_dflt_router(&ipv6_hdr(skb)->saddr, skb->dev, pref); |
1da177e4 LT |
1236 | if (rt == NULL) { |
1237 | ND_PRINTK0(KERN_ERR | |
1238 | "ICMPv6 RA: %s() failed to add default route.\n", | |
0dc47877 | 1239 | __func__); |
1da177e4 LT |
1240 | in6_dev_put(in6_dev); |
1241 | return; | |
1242 | } | |
1243 | ||
1244 | neigh = rt->rt6i_nexthop; | |
1245 | if (neigh == NULL) { | |
1246 | ND_PRINTK0(KERN_ERR | |
1247 | "ICMPv6 RA: %s() got default router without neighbour.\n", | |
0dc47877 | 1248 | __func__); |
d8d1f30b | 1249 | dst_release(&rt->dst); |
1da177e4 LT |
1250 | in6_dev_put(in6_dev); |
1251 | return; | |
1252 | } | |
1253 | neigh->flags |= NTF_ROUTER; | |
ebacaaa0 | 1254 | } else if (rt) { |
22441cfa | 1255 | rt->rt6i_flags = (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); |
1da177e4 LT |
1256 | } |
1257 | ||
1258 | if (rt) | |
1259 | rt->rt6i_expires = jiffies + (HZ * lifetime); | |
1260 | ||
1261 | if (ra_msg->icmph.icmp6_hop_limit) { | |
1262 | in6_dev->cnf.hop_limit = ra_msg->icmph.icmp6_hop_limit; | |
1263 | if (rt) | |
defb3519 DM |
1264 | dst_metric_set(&rt->dst, RTAX_HOPLIMIT, |
1265 | ra_msg->icmph.icmp6_hop_limit); | |
1da177e4 LT |
1266 | } |
1267 | ||
65f5c7c1 YH |
1268 | skip_defrtr: |
1269 | ||
1da177e4 LT |
1270 | /* |
1271 | * Update Reachable Time and Retrans Timer | |
1272 | */ | |
1273 | ||
1274 | if (in6_dev->nd_parms) { | |
1275 | unsigned long rtime = ntohl(ra_msg->retrans_timer); | |
1276 | ||
1277 | if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/HZ) { | |
1278 | rtime = (rtime*HZ)/1000; | |
1279 | if (rtime < HZ/10) | |
1280 | rtime = HZ/10; | |
1281 | in6_dev->nd_parms->retrans_time = rtime; | |
1282 | in6_dev->tstamp = jiffies; | |
1283 | inet6_ifinfo_notify(RTM_NEWLINK, in6_dev); | |
1284 | } | |
1285 | ||
1286 | rtime = ntohl(ra_msg->reachable_time); | |
1287 | if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/(3*HZ)) { | |
1288 | rtime = (rtime*HZ)/1000; | |
1289 | ||
1290 | if (rtime < HZ/10) | |
1291 | rtime = HZ/10; | |
1292 | ||
1293 | if (rtime != in6_dev->nd_parms->base_reachable_time) { | |
1294 | in6_dev->nd_parms->base_reachable_time = rtime; | |
1295 | in6_dev->nd_parms->gc_staletime = 3 * rtime; | |
1296 | in6_dev->nd_parms->reachable_time = neigh_rand_reach_time(rtime); | |
1297 | in6_dev->tstamp = jiffies; | |
1298 | inet6_ifinfo_notify(RTM_NEWLINK, in6_dev); | |
1299 | } | |
1300 | } | |
1301 | } | |
1302 | ||
fadf6bf0 TF |
1303 | skip_linkparms: |
1304 | ||
1da177e4 LT |
1305 | /* |
1306 | * Process options. | |
1307 | */ | |
1308 | ||
1309 | if (!neigh) | |
0660e03f | 1310 | neigh = __neigh_lookup(&nd_tbl, &ipv6_hdr(skb)->saddr, |
1da177e4 LT |
1311 | skb->dev, 1); |
1312 | if (neigh) { | |
1313 | u8 *lladdr = NULL; | |
1314 | if (ndopts.nd_opts_src_lladdr) { | |
1315 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, | |
1316 | skb->dev); | |
1317 | if (!lladdr) { | |
1318 | ND_PRINTK2(KERN_WARNING | |
1319 | "ICMPv6 RA: invalid link-layer address length\n"); | |
1320 | goto out; | |
1321 | } | |
1322 | } | |
1323 | neigh_update(neigh, lladdr, NUD_STALE, | |
1324 | NEIGH_UPDATE_F_WEAK_OVERRIDE| | |
1325 | NEIGH_UPDATE_F_OVERRIDE| | |
1326 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
1327 | NEIGH_UPDATE_F_ISROUTER); | |
1328 | } | |
1329 | ||
65e9b62d | 1330 | if (!accept_ra(in6_dev)) |
31ce8c71 DW |
1331 | goto out; |
1332 | ||
70ceb4f5 | 1333 | #ifdef CONFIG_IPV6_ROUTE_INFO |
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 | |
1345 | if (ri->prefix_len > in6_dev->cnf.accept_ra_rt_info_max_plen) | |
09c884d4 | 1346 | continue; |
70ceb4f5 | 1347 | rt6_route_rcv(skb->dev, (u8*)p, (p->nd_opt_len) << 3, |
0660e03f | 1348 | &ipv6_hdr(skb)->saddr); |
70ceb4f5 YH |
1349 | } |
1350 | } | |
1351 | #endif | |
1352 | ||
de357cc0 | 1353 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 TF |
1354 | /* skip link-specific ndopts from interior routers */ |
1355 | if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT) | |
1356 | goto out; | |
de357cc0 | 1357 | #endif |
fadf6bf0 | 1358 | |
c4fd30eb | 1359 | if (in6_dev->cnf.accept_ra_pinfo && ndopts.nd_opts_pi) { |
1da177e4 LT |
1360 | struct nd_opt_hdr *p; |
1361 | for (p = ndopts.nd_opts_pi; | |
1362 | p; | |
1363 | p = ndisc_next_option(p, ndopts.nd_opts_pi_end)) { | |
1364 | addrconf_prefix_rcv(skb->dev, (u8*)p, (p->nd_opt_len) << 3); | |
1365 | } | |
1366 | } | |
1367 | ||
1368 | if (ndopts.nd_opts_mtu) { | |
e69a4adc | 1369 | __be32 n; |
1da177e4 LT |
1370 | u32 mtu; |
1371 | ||
e69a4adc AV |
1372 | memcpy(&n, ((u8*)(ndopts.nd_opts_mtu+1))+2, sizeof(mtu)); |
1373 | mtu = ntohl(n); | |
1da177e4 LT |
1374 | |
1375 | if (mtu < IPV6_MIN_MTU || mtu > skb->dev->mtu) { | |
1376 | ND_PRINTK2(KERN_WARNING | |
1377 | "ICMPv6 RA: invalid mtu: %d\n", | |
1378 | mtu); | |
1379 | } else if (in6_dev->cnf.mtu6 != mtu) { | |
1380 | in6_dev->cnf.mtu6 = mtu; | |
1381 | ||
1382 | if (rt) | |
defb3519 | 1383 | dst_metric_set(&rt->dst, RTAX_MTU, mtu); |
1da177e4 LT |
1384 | |
1385 | rt6_mtu_change(skb->dev, mtu); | |
1386 | } | |
1387 | } | |
1ab1457c | 1388 | |
31910575 | 1389 | if (ndopts.nd_useropts) { |
61cf46ad YH |
1390 | struct nd_opt_hdr *p; |
1391 | for (p = ndopts.nd_useropts; | |
1392 | p; | |
1393 | p = ndisc_next_useropt(p, ndopts.nd_useropts_end)) { | |
1394 | ndisc_ra_useropt(skb, p); | |
31910575 PY |
1395 | } |
1396 | } | |
1397 | ||
1da177e4 LT |
1398 | if (ndopts.nd_opts_tgt_lladdr || ndopts.nd_opts_rh) { |
1399 | ND_PRINTK2(KERN_WARNING | |
1400 | "ICMPv6 RA: invalid RA options"); | |
1401 | } | |
1402 | out: | |
1403 | if (rt) | |
d8d1f30b | 1404 | dst_release(&rt->dst); |
1da177e4 LT |
1405 | else if (neigh) |
1406 | neigh_release(neigh); | |
1407 | in6_dev_put(in6_dev); | |
1408 | } | |
1409 | ||
1410 | static void ndisc_redirect_rcv(struct sk_buff *skb) | |
1411 | { | |
1412 | struct inet6_dev *in6_dev; | |
1413 | struct icmp6hdr *icmph; | |
1414 | struct in6_addr *dest; | |
1415 | struct in6_addr *target; /* new first hop to destination */ | |
1416 | struct neighbour *neigh; | |
1417 | int on_link = 0; | |
1418 | struct ndisc_options ndopts; | |
1419 | int optlen; | |
1420 | u8 *lladdr = NULL; | |
1421 | ||
de357cc0 | 1422 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 TF |
1423 | switch (skb->ndisc_nodetype) { |
1424 | case NDISC_NODETYPE_HOST: | |
1425 | case NDISC_NODETYPE_NODEFAULT: | |
1426 | ND_PRINTK2(KERN_WARNING | |
1427 | "ICMPv6 Redirect: from host or unauthorized router\n"); | |
1428 | return; | |
1429 | } | |
de357cc0 | 1430 | #endif |
fadf6bf0 | 1431 | |
0660e03f | 1432 | if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) { |
1da177e4 LT |
1433 | ND_PRINTK2(KERN_WARNING |
1434 | "ICMPv6 Redirect: source address is not link-local.\n"); | |
1435 | return; | |
1436 | } | |
1437 | ||
27a884dc | 1438 | optlen = skb->tail - skb->transport_header; |
1da177e4 LT |
1439 | optlen -= sizeof(struct icmp6hdr) + 2 * sizeof(struct in6_addr); |
1440 | ||
1441 | if (optlen < 0) { | |
1442 | ND_PRINTK2(KERN_WARNING | |
1443 | "ICMPv6 Redirect: packet too short\n"); | |
1444 | return; | |
1445 | } | |
1446 | ||
cc70ab26 | 1447 | icmph = icmp6_hdr(skb); |
1da177e4 LT |
1448 | target = (struct in6_addr *) (icmph + 1); |
1449 | dest = target + 1; | |
1450 | ||
1451 | if (ipv6_addr_is_multicast(dest)) { | |
1452 | ND_PRINTK2(KERN_WARNING | |
1453 | "ICMPv6 Redirect: destination address is multicast.\n"); | |
1454 | return; | |
1455 | } | |
1456 | ||
1457 | if (ipv6_addr_equal(dest, target)) { | |
1458 | on_link = 1; | |
bf0b48df BH |
1459 | } else if (ipv6_addr_type(target) != |
1460 | (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) { | |
1ab1457c | 1461 | ND_PRINTK2(KERN_WARNING |
bf0b48df | 1462 | "ICMPv6 Redirect: target address is not link-local unicast.\n"); |
1da177e4 LT |
1463 | return; |
1464 | } | |
1465 | ||
1466 | in6_dev = in6_dev_get(skb->dev); | |
1467 | if (!in6_dev) | |
1468 | return; | |
1469 | if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects) { | |
1470 | in6_dev_put(in6_dev); | |
1471 | return; | |
1472 | } | |
1473 | ||
1ab1457c | 1474 | /* RFC2461 8.1: |
1da177e4 LT |
1475 | * The IP source address of the Redirect MUST be the same as the current |
1476 | * first-hop router for the specified ICMP Destination Address. | |
1477 | */ | |
1ab1457c | 1478 | |
1da177e4 LT |
1479 | if (!ndisc_parse_options((u8*)(dest + 1), optlen, &ndopts)) { |
1480 | ND_PRINTK2(KERN_WARNING | |
1481 | "ICMPv6 Redirect: invalid ND options\n"); | |
1482 | in6_dev_put(in6_dev); | |
1483 | return; | |
1484 | } | |
1485 | if (ndopts.nd_opts_tgt_lladdr) { | |
1486 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, | |
1487 | skb->dev); | |
1488 | if (!lladdr) { | |
1489 | ND_PRINTK2(KERN_WARNING | |
1490 | "ICMPv6 Redirect: invalid link-layer address length\n"); | |
1491 | in6_dev_put(in6_dev); | |
1492 | return; | |
1493 | } | |
1494 | } | |
1495 | ||
1496 | neigh = __neigh_lookup(&nd_tbl, target, skb->dev, 1); | |
1497 | if (neigh) { | |
0660e03f ACM |
1498 | rt6_redirect(dest, &ipv6_hdr(skb)->daddr, |
1499 | &ipv6_hdr(skb)->saddr, neigh, lladdr, | |
1da177e4 LT |
1500 | on_link); |
1501 | neigh_release(neigh); | |
1502 | } | |
1503 | in6_dev_put(in6_dev); | |
1504 | } | |
1505 | ||
1506 | void ndisc_send_redirect(struct sk_buff *skb, struct neighbour *neigh, | |
9acd9f3a | 1507 | const struct in6_addr *target) |
1da177e4 | 1508 | { |
1762f7e8 | 1509 | struct net_device *dev = skb->dev; |
c346dca1 | 1510 | struct net *net = dev_net(dev); |
1762f7e8 | 1511 | struct sock *sk = net->ipv6.ndisc_sk; |
1da177e4 LT |
1512 | int len = sizeof(struct icmp6hdr) + 2 * sizeof(struct in6_addr); |
1513 | struct sk_buff *buff; | |
1514 | struct icmp6hdr *icmph; | |
1515 | struct in6_addr saddr_buf; | |
1516 | struct in6_addr *addrp; | |
1da177e4 LT |
1517 | struct rt6_info *rt; |
1518 | struct dst_entry *dst; | |
1519 | struct inet6_dev *idev; | |
4c9483b2 | 1520 | struct flowi6 fl6; |
1da177e4 LT |
1521 | u8 *opt; |
1522 | int rd_len; | |
1523 | int err; | |
1da177e4 LT |
1524 | u8 ha_buf[MAX_ADDR_LEN], *ha = NULL; |
1525 | ||
95c385b4 | 1526 | if (ipv6_get_lladdr(dev, &saddr_buf, IFA_F_TENTATIVE)) { |
1da177e4 LT |
1527 | ND_PRINTK2(KERN_WARNING |
1528 | "ICMPv6 Redirect: no link-local address on %s\n", | |
1529 | dev->name); | |
1ab1457c YH |
1530 | return; |
1531 | } | |
1da177e4 | 1532 | |
0660e03f | 1533 | if (!ipv6_addr_equal(&ipv6_hdr(skb)->daddr, target) && |
bf0b48df | 1534 | ipv6_addr_type(target) != (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) { |
29556526 | 1535 | ND_PRINTK2(KERN_WARNING |
bf0b48df | 1536 | "ICMPv6 Redirect: target address is not link-local unicast.\n"); |
29556526 LY |
1537 | return; |
1538 | } | |
1539 | ||
4c9483b2 | 1540 | icmpv6_flow_init(sk, &fl6, NDISC_REDIRECT, |
95e41e93 | 1541 | &saddr_buf, &ipv6_hdr(skb)->saddr, dev->ifindex); |
1da177e4 | 1542 | |
4c9483b2 | 1543 | dst = ip6_route_output(net, NULL, &fl6); |
1da177e4 LT |
1544 | if (dst == NULL) |
1545 | return; | |
1546 | ||
4c9483b2 | 1547 | dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), NULL, 0); |
452edd59 | 1548 | if (IS_ERR(dst)) |
1da177e4 | 1549 | return; |
1da177e4 LT |
1550 | |
1551 | rt = (struct rt6_info *) dst; | |
1552 | ||
1553 | if (rt->rt6i_flags & RTF_GATEWAY) { | |
1554 | ND_PRINTK2(KERN_WARNING | |
1555 | "ICMPv6 Redirect: destination is not a neighbour.\n"); | |
d73f0801 | 1556 | goto release; |
1da177e4 | 1557 | } |
92d86829 DM |
1558 | if (!rt->rt6i_peer) |
1559 | rt6_bind_peer(rt, 1); | |
1560 | if (inet_peer_xrlim_allow(rt->rt6i_peer, 1*HZ)) | |
d73f0801 | 1561 | goto release; |
1da177e4 LT |
1562 | |
1563 | if (dev->addr_len) { | |
1564 | read_lock_bh(&neigh->lock); | |
1565 | if (neigh->nud_state & NUD_VALID) { | |
1566 | memcpy(ha_buf, neigh->ha, dev->addr_len); | |
1567 | read_unlock_bh(&neigh->lock); | |
1568 | ha = ha_buf; | |
1569 | len += ndisc_opt_addr_space(dev); | |
1570 | } else | |
1571 | read_unlock_bh(&neigh->lock); | |
1572 | } | |
1573 | ||
1574 | rd_len = min_t(unsigned int, | |
1575 | IPV6_MIN_MTU-sizeof(struct ipv6hdr)-len, skb->len + 8); | |
1576 | rd_len &= ~0x7; | |
1577 | len += rd_len; | |
1578 | ||
d54a81d3 DM |
1579 | buff = sock_alloc_send_skb(sk, |
1580 | (MAX_HEADER + sizeof(struct ipv6hdr) + | |
f5184d26 | 1581 | len + LL_ALLOCATED_SPACE(dev)), |
1da177e4 LT |
1582 | 1, &err); |
1583 | if (buff == NULL) { | |
1584 | ND_PRINTK0(KERN_ERR | |
dae9de8e BH |
1585 | "ICMPv6 Redirect: %s() failed to allocate an skb, err=%d.\n", |
1586 | __func__, err); | |
d73f0801 | 1587 | goto release; |
1da177e4 LT |
1588 | } |
1589 | ||
1da177e4 | 1590 | skb_reserve(buff, LL_RESERVED_SPACE(dev)); |
0660e03f | 1591 | ip6_nd_hdr(sk, buff, dev, &saddr_buf, &ipv6_hdr(skb)->saddr, |
1da177e4 LT |
1592 | IPPROTO_ICMPV6, len); |
1593 | ||
27a884dc | 1594 | skb_set_transport_header(buff, skb_tail_pointer(buff) - buff->data); |
d10ba34b ACM |
1595 | skb_put(buff, len); |
1596 | icmph = icmp6_hdr(buff); | |
1da177e4 LT |
1597 | |
1598 | memset(icmph, 0, sizeof(struct icmp6hdr)); | |
1599 | icmph->icmp6_type = NDISC_REDIRECT; | |
1600 | ||
1601 | /* | |
1602 | * copy target and destination addresses | |
1603 | */ | |
1604 | ||
1605 | addrp = (struct in6_addr *)(icmph + 1); | |
1606 | ipv6_addr_copy(addrp, target); | |
1607 | addrp++; | |
0660e03f | 1608 | ipv6_addr_copy(addrp, &ipv6_hdr(skb)->daddr); |
1da177e4 LT |
1609 | |
1610 | opt = (u8*) (addrp + 1); | |
1611 | ||
1612 | /* | |
1613 | * include target_address option | |
1614 | */ | |
1615 | ||
1616 | if (ha) | |
1617 | opt = ndisc_fill_addr_option(opt, ND_OPT_TARGET_LL_ADDR, ha, | |
1618 | dev->addr_len, dev->type); | |
1619 | ||
1620 | /* | |
1621 | * build redirect option and copy skb over to the new packet. | |
1622 | */ | |
1623 | ||
1ab1457c | 1624 | memset(opt, 0, 8); |
1da177e4 LT |
1625 | *(opt++) = ND_OPT_REDIRECT_HDR; |
1626 | *(opt++) = (rd_len >> 3); | |
1627 | opt += 6; | |
1628 | ||
0660e03f | 1629 | memcpy(opt, ipv6_hdr(skb), rd_len - 8); |
1da177e4 | 1630 | |
0660e03f | 1631 | icmph->icmp6_cksum = csum_ipv6_magic(&saddr_buf, &ipv6_hdr(skb)->saddr, |
1da177e4 | 1632 | len, IPPROTO_ICMPV6, |
07f0757a | 1633 | csum_partial(icmph, len, 0)); |
1da177e4 | 1634 | |
adf30907 | 1635 | skb_dst_set(buff, dst); |
1da177e4 | 1636 | idev = in6_dev_get(dst->dev); |
edf391ff | 1637 | IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len); |
b2e0b385 | 1638 | err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, buff, NULL, dst->dev, |
6e23ae2a | 1639 | dst_output); |
1da177e4 | 1640 | if (!err) { |
5c5d244b | 1641 | ICMP6MSGOUT_INC_STATS(net, idev, NDISC_REDIRECT); |
a862f6a6 | 1642 | ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); |
1da177e4 LT |
1643 | } |
1644 | ||
1645 | if (likely(idev != NULL)) | |
1646 | in6_dev_put(idev); | |
d73f0801 IJ |
1647 | return; |
1648 | ||
1649 | release: | |
1650 | dst_release(dst); | |
1da177e4 LT |
1651 | } |
1652 | ||
1653 | static void pndisc_redo(struct sk_buff *skb) | |
1654 | { | |
140e26fc | 1655 | ndisc_recv_ns(skb); |
1da177e4 LT |
1656 | kfree_skb(skb); |
1657 | } | |
1658 | ||
1659 | int ndisc_rcv(struct sk_buff *skb) | |
1660 | { | |
1661 | struct nd_msg *msg; | |
1662 | ||
1663 | if (!pskb_may_pull(skb, skb->len)) | |
1664 | return 0; | |
1665 | ||
9c70220b | 1666 | msg = (struct nd_msg *)skb_transport_header(skb); |
1da177e4 | 1667 | |
9c70220b | 1668 | __skb_push(skb, skb->data - skb_transport_header(skb)); |
1da177e4 | 1669 | |
0660e03f | 1670 | if (ipv6_hdr(skb)->hop_limit != 255) { |
1da177e4 LT |
1671 | ND_PRINTK2(KERN_WARNING |
1672 | "ICMPv6 NDISC: invalid hop-limit: %d\n", | |
0660e03f | 1673 | ipv6_hdr(skb)->hop_limit); |
1da177e4 LT |
1674 | return 0; |
1675 | } | |
1676 | ||
1677 | if (msg->icmph.icmp6_code != 0) { | |
1ab1457c | 1678 | ND_PRINTK2(KERN_WARNING |
1da177e4 LT |
1679 | "ICMPv6 NDISC: invalid ICMPv6 code: %d\n", |
1680 | msg->icmph.icmp6_code); | |
1681 | return 0; | |
1682 | } | |
1683 | ||
a61bbcf2 PM |
1684 | memset(NEIGH_CB(skb), 0, sizeof(struct neighbour_cb)); |
1685 | ||
1da177e4 LT |
1686 | switch (msg->icmph.icmp6_type) { |
1687 | case NDISC_NEIGHBOUR_SOLICITATION: | |
1688 | ndisc_recv_ns(skb); | |
1689 | break; | |
1690 | ||
1691 | case NDISC_NEIGHBOUR_ADVERTISEMENT: | |
1692 | ndisc_recv_na(skb); | |
1693 | break; | |
1694 | ||
1695 | case NDISC_ROUTER_SOLICITATION: | |
1696 | ndisc_recv_rs(skb); | |
1697 | break; | |
1698 | ||
1699 | case NDISC_ROUTER_ADVERTISEMENT: | |
1700 | ndisc_router_discovery(skb); | |
1701 | break; | |
1702 | ||
1703 | case NDISC_REDIRECT: | |
1704 | ndisc_redirect_rcv(skb); | |
1705 | break; | |
3ff50b79 | 1706 | } |
1da177e4 LT |
1707 | |
1708 | return 0; | |
1709 | } | |
1710 | ||
1711 | static int ndisc_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1712 | { | |
1713 | struct net_device *dev = ptr; | |
c346dca1 | 1714 | struct net *net = dev_net(dev); |
1da177e4 LT |
1715 | |
1716 | switch (event) { | |
1717 | case NETDEV_CHANGEADDR: | |
1718 | neigh_changeaddr(&nd_tbl, dev); | |
5b7c931d | 1719 | fib6_run_gc(~0UL, net); |
1da177e4 LT |
1720 | break; |
1721 | case NETDEV_DOWN: | |
1722 | neigh_ifdown(&nd_tbl, dev); | |
5b7c931d | 1723 | fib6_run_gc(~0UL, net); |
1da177e4 LT |
1724 | break; |
1725 | default: | |
1726 | break; | |
1727 | } | |
1728 | ||
1729 | return NOTIFY_DONE; | |
1730 | } | |
1731 | ||
1732 | static struct notifier_block ndisc_netdev_notifier = { | |
1733 | .notifier_call = ndisc_netdev_event, | |
1734 | }; | |
1735 | ||
1736 | #ifdef CONFIG_SYSCTL | |
1737 | static void ndisc_warn_deprecated_sysctl(struct ctl_table *ctl, | |
1738 | const char *func, const char *dev_name) | |
1739 | { | |
1740 | static char warncomm[TASK_COMM_LEN]; | |
1741 | static int warned; | |
1742 | if (strcmp(warncomm, current->comm) && warned < 5) { | |
1743 | strcpy(warncomm, current->comm); | |
1744 | printk(KERN_WARNING | |
1745 | "process `%s' is using deprecated sysctl (%s) " | |
1746 | "net.ipv6.neigh.%s.%s; " | |
1747 | "Use net.ipv6.neigh.%s.%s_ms " | |
1748 | "instead.\n", | |
1749 | warncomm, func, | |
1750 | dev_name, ctl->procname, | |
1751 | dev_name, ctl->procname); | |
1752 | warned++; | |
1753 | } | |
1754 | } | |
1755 | ||
8d65af78 | 1756 | int ndisc_ifinfo_sysctl_change(struct ctl_table *ctl, int write, void __user *buffer, size_t *lenp, loff_t *ppos) |
1da177e4 LT |
1757 | { |
1758 | struct net_device *dev = ctl->extra1; | |
1759 | struct inet6_dev *idev; | |
1760 | int ret; | |
1761 | ||
d12af679 EB |
1762 | if ((strcmp(ctl->procname, "retrans_time") == 0) || |
1763 | (strcmp(ctl->procname, "base_reachable_time") == 0)) | |
1da177e4 LT |
1764 | ndisc_warn_deprecated_sysctl(ctl, "syscall", dev ? dev->name : "default"); |
1765 | ||
d12af679 | 1766 | if (strcmp(ctl->procname, "retrans_time") == 0) |
8d65af78 | 1767 | ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
d12af679 EB |
1768 | |
1769 | else if (strcmp(ctl->procname, "base_reachable_time") == 0) | |
1da177e4 | 1770 | ret = proc_dointvec_jiffies(ctl, write, |
8d65af78 | 1771 | buffer, lenp, ppos); |
d12af679 EB |
1772 | |
1773 | else if ((strcmp(ctl->procname, "retrans_time_ms") == 0) || | |
ad02ac14 | 1774 | (strcmp(ctl->procname, "base_reachable_time_ms") == 0)) |
1da177e4 | 1775 | ret = proc_dointvec_ms_jiffies(ctl, write, |
8d65af78 | 1776 | buffer, lenp, ppos); |
d12af679 | 1777 | else |
1da177e4 | 1778 | ret = -1; |
1da177e4 LT |
1779 | |
1780 | if (write && ret == 0 && dev && (idev = in6_dev_get(dev)) != NULL) { | |
d12af679 | 1781 | if (ctl->data == &idev->nd_parms->base_reachable_time) |
1da177e4 LT |
1782 | idev->nd_parms->reachable_time = neigh_rand_reach_time(idev->nd_parms->base_reachable_time); |
1783 | idev->tstamp = jiffies; | |
1784 | inet6_ifinfo_notify(RTM_NEWLINK, idev); | |
1785 | in6_dev_put(idev); | |
1786 | } | |
1787 | return ret; | |
1788 | } | |
1789 | ||
1da177e4 LT |
1790 | |
1791 | #endif | |
1792 | ||
2c8c1e72 | 1793 | static int __net_init ndisc_net_init(struct net *net) |
1da177e4 LT |
1794 | { |
1795 | struct ipv6_pinfo *np; | |
1796 | struct sock *sk; | |
1ab1457c | 1797 | int err; |
1da177e4 | 1798 | |
1ed8516f DL |
1799 | err = inet_ctl_sock_create(&sk, PF_INET6, |
1800 | SOCK_RAW, IPPROTO_ICMPV6, net); | |
1da177e4 LT |
1801 | if (err < 0) { |
1802 | ND_PRINTK0(KERN_ERR | |
1ab1457c | 1803 | "ICMPv6 NDISC: Failed to initialize the control socket (err %d).\n", |
1da177e4 | 1804 | err); |
1da177e4 LT |
1805 | return err; |
1806 | } | |
1807 | ||
1ed8516f | 1808 | net->ipv6.ndisc_sk = sk; |
1762f7e8 | 1809 | |
1da177e4 | 1810 | np = inet6_sk(sk); |
1da177e4 LT |
1811 | np->hop_limit = 255; |
1812 | /* Do not loopback ndisc messages */ | |
1813 | np->mc_loop = 0; | |
1da177e4 | 1814 | |
1762f7e8 DL |
1815 | return 0; |
1816 | } | |
1817 | ||
2c8c1e72 | 1818 | static void __net_exit ndisc_net_exit(struct net *net) |
1762f7e8 | 1819 | { |
1ed8516f | 1820 | inet_ctl_sock_destroy(net->ipv6.ndisc_sk); |
1762f7e8 DL |
1821 | } |
1822 | ||
1823 | static struct pernet_operations ndisc_net_ops = { | |
1824 | .init = ndisc_net_init, | |
1825 | .exit = ndisc_net_exit, | |
1826 | }; | |
1827 | ||
1828 | int __init ndisc_init(void) | |
1829 | { | |
1830 | int err; | |
1831 | ||
1832 | err = register_pernet_subsys(&ndisc_net_ops); | |
1833 | if (err) | |
1834 | return err; | |
1ab1457c YH |
1835 | /* |
1836 | * Initialize the neighbour table | |
1837 | */ | |
1da177e4 LT |
1838 | neigh_table_init(&nd_tbl); |
1839 | ||
1840 | #ifdef CONFIG_SYSCTL | |
54716e3b | 1841 | err = neigh_sysctl_register(NULL, &nd_tbl.parms, "ipv6", |
f8572d8f | 1842 | &ndisc_ifinfo_sysctl_change); |
1762f7e8 DL |
1843 | if (err) |
1844 | goto out_unregister_pernet; | |
1da177e4 | 1845 | #endif |
1762f7e8 DL |
1846 | err = register_netdevice_notifier(&ndisc_netdev_notifier); |
1847 | if (err) | |
1848 | goto out_unregister_sysctl; | |
1849 | out: | |
1850 | return err; | |
1da177e4 | 1851 | |
1762f7e8 DL |
1852 | out_unregister_sysctl: |
1853 | #ifdef CONFIG_SYSCTL | |
1854 | neigh_sysctl_unregister(&nd_tbl.parms); | |
1855 | out_unregister_pernet: | |
1856 | #endif | |
1857 | unregister_pernet_subsys(&ndisc_net_ops); | |
1858 | goto out; | |
1da177e4 LT |
1859 | } |
1860 | ||
1861 | void ndisc_cleanup(void) | |
1862 | { | |
36f73d0c | 1863 | unregister_netdevice_notifier(&ndisc_netdev_notifier); |
1da177e4 LT |
1864 | #ifdef CONFIG_SYSCTL |
1865 | neigh_sysctl_unregister(&nd_tbl.parms); | |
1866 | #endif | |
1867 | neigh_table_clear(&nd_tbl); | |
1762f7e8 | 1868 | unregister_pernet_subsys(&ndisc_net_ops); |
1da177e4 | 1869 | } |