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 | * | |
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> | |
62 | #ifdef CONFIG_SYSCTL | |
63 | #include <linux/sysctl.h> | |
64 | #endif | |
65 | ||
1823730f | 66 | #include <linux/if_addr.h> |
1da177e4 LT |
67 | #include <linux/if_arp.h> |
68 | #include <linux/ipv6.h> | |
69 | #include <linux/icmpv6.h> | |
70 | #include <linux/jhash.h> | |
71 | ||
72 | #include <net/sock.h> | |
73 | #include <net/snmp.h> | |
74 | ||
75 | #include <net/ipv6.h> | |
76 | #include <net/protocol.h> | |
77 | #include <net/ndisc.h> | |
78 | #include <net/ip6_route.h> | |
79 | #include <net/addrconf.h> | |
80 | #include <net/icmp.h> | |
81 | ||
31910575 PY |
82 | #include <net/netlink.h> |
83 | #include <linux/rtnetlink.h> | |
84 | ||
1da177e4 LT |
85 | #include <net/flow.h> |
86 | #include <net/ip6_checksum.h> | |
87 | #include <linux/proc_fs.h> | |
88 | ||
89 | #include <linux/netfilter.h> | |
90 | #include <linux/netfilter_ipv6.h> | |
91 | ||
92 | static struct socket *ndisc_socket; | |
93 | ||
94 | static u32 ndisc_hash(const void *pkey, const struct net_device *dev); | |
95 | static int ndisc_constructor(struct neighbour *neigh); | |
96 | static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb); | |
97 | static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb); | |
98 | static int pndisc_constructor(struct pneigh_entry *n); | |
99 | static void pndisc_destructor(struct pneigh_entry *n); | |
100 | static void pndisc_redo(struct sk_buff *skb); | |
101 | ||
102 | static struct neigh_ops ndisc_generic_ops = { | |
103 | .family = AF_INET6, | |
104 | .solicit = ndisc_solicit, | |
105 | .error_report = ndisc_error_report, | |
106 | .output = neigh_resolve_output, | |
107 | .connected_output = neigh_connected_output, | |
108 | .hh_output = dev_queue_xmit, | |
109 | .queue_xmit = dev_queue_xmit, | |
110 | }; | |
111 | ||
112 | static struct neigh_ops ndisc_hh_ops = { | |
113 | .family = AF_INET6, | |
114 | .solicit = ndisc_solicit, | |
115 | .error_report = ndisc_error_report, | |
116 | .output = neigh_resolve_output, | |
117 | .connected_output = neigh_resolve_output, | |
118 | .hh_output = dev_queue_xmit, | |
119 | .queue_xmit = dev_queue_xmit, | |
120 | }; | |
121 | ||
122 | ||
123 | static struct neigh_ops ndisc_direct_ops = { | |
124 | .family = AF_INET6, | |
125 | .output = dev_queue_xmit, | |
126 | .connected_output = dev_queue_xmit, | |
127 | .hh_output = dev_queue_xmit, | |
128 | .queue_xmit = dev_queue_xmit, | |
129 | }; | |
130 | ||
131 | struct neigh_table nd_tbl = { | |
132 | .family = AF_INET6, | |
133 | .entry_size = sizeof(struct neighbour) + sizeof(struct in6_addr), | |
134 | .key_len = sizeof(struct in6_addr), | |
135 | .hash = ndisc_hash, | |
136 | .constructor = ndisc_constructor, | |
137 | .pconstructor = pndisc_constructor, | |
138 | .pdestructor = pndisc_destructor, | |
139 | .proxy_redo = pndisc_redo, | |
140 | .id = "ndisc_cache", | |
141 | .parms = { | |
142 | .tbl = &nd_tbl, | |
143 | .base_reachable_time = 30 * HZ, | |
144 | .retrans_time = 1 * HZ, | |
145 | .gc_staletime = 60 * HZ, | |
146 | .reachable_time = 30 * HZ, | |
147 | .delay_probe_time = 5 * HZ, | |
148 | .queue_len = 3, | |
149 | .ucast_probes = 3, | |
150 | .mcast_probes = 3, | |
151 | .anycast_delay = 1 * HZ, | |
152 | .proxy_delay = (8 * HZ) / 10, | |
153 | .proxy_qlen = 64, | |
154 | }, | |
155 | .gc_interval = 30 * HZ, | |
156 | .gc_thresh1 = 128, | |
157 | .gc_thresh2 = 512, | |
158 | .gc_thresh3 = 1024, | |
159 | }; | |
160 | ||
161 | /* ND options */ | |
162 | struct ndisc_options { | |
70ceb4f5 YH |
163 | struct nd_opt_hdr *nd_opt_array[__ND_OPT_ARRAY_MAX]; |
164 | #ifdef CONFIG_IPV6_ROUTE_INFO | |
165 | struct nd_opt_hdr *nd_opts_ri; | |
166 | struct nd_opt_hdr *nd_opts_ri_end; | |
167 | #endif | |
31910575 PY |
168 | struct nd_opt_hdr *nd_useropts; |
169 | struct nd_opt_hdr *nd_useropts_end; | |
1da177e4 LT |
170 | }; |
171 | ||
172 | #define nd_opts_src_lladdr nd_opt_array[ND_OPT_SOURCE_LL_ADDR] | |
173 | #define nd_opts_tgt_lladdr nd_opt_array[ND_OPT_TARGET_LL_ADDR] | |
174 | #define nd_opts_pi nd_opt_array[ND_OPT_PREFIX_INFO] | |
175 | #define nd_opts_pi_end nd_opt_array[__ND_OPT_PREFIX_INFO_END] | |
176 | #define nd_opts_rh nd_opt_array[ND_OPT_REDIRECT_HDR] | |
177 | #define nd_opts_mtu nd_opt_array[ND_OPT_MTU] | |
178 | ||
179 | #define NDISC_OPT_SPACE(len) (((len)+2+7)&~7) | |
180 | ||
181 | /* | |
182 | * Return the padding between the option length and the start of the | |
183 | * link addr. Currently only IP-over-InfiniBand needs this, although | |
184 | * if RFC 3831 IPv6-over-Fibre Channel is ever implemented it may | |
185 | * also need a pad of 2. | |
186 | */ | |
187 | static int ndisc_addr_option_pad(unsigned short type) | |
188 | { | |
189 | switch (type) { | |
190 | case ARPHRD_INFINIBAND: return 2; | |
191 | default: return 0; | |
192 | } | |
193 | } | |
194 | ||
195 | static inline int ndisc_opt_addr_space(struct net_device *dev) | |
196 | { | |
197 | return NDISC_OPT_SPACE(dev->addr_len + ndisc_addr_option_pad(dev->type)); | |
198 | } | |
199 | ||
200 | static u8 *ndisc_fill_addr_option(u8 *opt, int type, void *data, int data_len, | |
201 | unsigned short addr_type) | |
202 | { | |
203 | int space = NDISC_OPT_SPACE(data_len); | |
204 | int pad = ndisc_addr_option_pad(addr_type); | |
205 | ||
206 | opt[0] = type; | |
207 | opt[1] = space>>3; | |
208 | ||
209 | memset(opt + 2, 0, pad); | |
210 | opt += pad; | |
211 | space -= pad; | |
212 | ||
213 | memcpy(opt+2, data, data_len); | |
214 | data_len += 2; | |
215 | opt += data_len; | |
216 | if ((space -= data_len) > 0) | |
217 | memset(opt, 0, space); | |
218 | return opt + space; | |
219 | } | |
220 | ||
221 | static struct nd_opt_hdr *ndisc_next_option(struct nd_opt_hdr *cur, | |
222 | struct nd_opt_hdr *end) | |
223 | { | |
224 | int type; | |
225 | if (!cur || !end || cur >= end) | |
226 | return NULL; | |
227 | type = cur->nd_opt_type; | |
228 | do { | |
229 | cur = ((void *)cur) + (cur->nd_opt_len << 3); | |
230 | } while(cur < end && cur->nd_opt_type != type); | |
231 | return (cur <= end && cur->nd_opt_type == type ? cur : NULL); | |
232 | } | |
233 | ||
31910575 PY |
234 | static inline int ndisc_is_useropt(struct nd_opt_hdr *opt) |
235 | { | |
236 | return (opt->nd_opt_type == ND_OPT_RDNSS); | |
237 | } | |
238 | ||
239 | static struct nd_opt_hdr *ndisc_next_useropt(struct nd_opt_hdr *cur, | |
240 | struct nd_opt_hdr *end) | |
241 | { | |
242 | if (!cur || !end || cur >= end) | |
243 | return NULL; | |
244 | do { | |
245 | cur = ((void *)cur) + (cur->nd_opt_len << 3); | |
246 | } while(cur < end && !ndisc_is_useropt(cur)); | |
247 | return (cur <= end && ndisc_is_useropt(cur) ? cur : NULL); | |
248 | } | |
249 | ||
1da177e4 LT |
250 | static struct ndisc_options *ndisc_parse_options(u8 *opt, int opt_len, |
251 | struct ndisc_options *ndopts) | |
252 | { | |
253 | struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)opt; | |
254 | ||
255 | if (!nd_opt || opt_len < 0 || !ndopts) | |
256 | return NULL; | |
257 | memset(ndopts, 0, sizeof(*ndopts)); | |
258 | while (opt_len) { | |
259 | int l; | |
260 | if (opt_len < sizeof(struct nd_opt_hdr)) | |
261 | return NULL; | |
262 | l = nd_opt->nd_opt_len << 3; | |
263 | if (opt_len < l || l == 0) | |
264 | return NULL; | |
265 | switch (nd_opt->nd_opt_type) { | |
266 | case ND_OPT_SOURCE_LL_ADDR: | |
267 | case ND_OPT_TARGET_LL_ADDR: | |
268 | case ND_OPT_MTU: | |
269 | case ND_OPT_REDIRECT_HDR: | |
270 | if (ndopts->nd_opt_array[nd_opt->nd_opt_type]) { | |
271 | ND_PRINTK2(KERN_WARNING | |
272 | "%s(): duplicated ND6 option found: type=%d\n", | |
273 | __FUNCTION__, | |
274 | nd_opt->nd_opt_type); | |
275 | } else { | |
276 | ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt; | |
277 | } | |
278 | break; | |
279 | case ND_OPT_PREFIX_INFO: | |
280 | ndopts->nd_opts_pi_end = nd_opt; | |
cfcabdcc | 281 | if (!ndopts->nd_opt_array[nd_opt->nd_opt_type]) |
1da177e4 LT |
282 | ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt; |
283 | break; | |
70ceb4f5 YH |
284 | #ifdef CONFIG_IPV6_ROUTE_INFO |
285 | case ND_OPT_ROUTE_INFO: | |
286 | ndopts->nd_opts_ri_end = nd_opt; | |
287 | if (!ndopts->nd_opts_ri) | |
288 | ndopts->nd_opts_ri = nd_opt; | |
289 | break; | |
290 | #endif | |
1da177e4 | 291 | default: |
31910575 PY |
292 | if (ndisc_is_useropt(nd_opt)) { |
293 | ndopts->nd_useropts_end = nd_opt; | |
294 | if (!ndopts->nd_useropts) | |
295 | ndopts->nd_useropts = nd_opt; | |
296 | } else { | |
297 | /* | |
298 | * Unknown options must be silently ignored, | |
299 | * to accommodate future extension to the | |
300 | * protocol. | |
301 | */ | |
302 | ND_PRINTK2(KERN_NOTICE | |
303 | "%s(): ignored unsupported option; type=%d, len=%d\n", | |
304 | __FUNCTION__, | |
305 | nd_opt->nd_opt_type, nd_opt->nd_opt_len); | |
306 | } | |
1da177e4 LT |
307 | } |
308 | opt_len -= l; | |
309 | nd_opt = ((void *)nd_opt) + l; | |
310 | } | |
311 | return ndopts; | |
312 | } | |
313 | ||
314 | static inline u8 *ndisc_opt_addr_data(struct nd_opt_hdr *p, | |
315 | struct net_device *dev) | |
316 | { | |
317 | u8 *lladdr = (u8 *)(p + 1); | |
318 | int lladdrlen = p->nd_opt_len << 3; | |
319 | int prepad = ndisc_addr_option_pad(dev->type); | |
320 | if (lladdrlen != NDISC_OPT_SPACE(dev->addr_len + prepad)) | |
321 | return NULL; | |
322 | return (lladdr + prepad); | |
323 | } | |
324 | ||
325 | int ndisc_mc_map(struct in6_addr *addr, char *buf, struct net_device *dev, int dir) | |
326 | { | |
327 | switch (dev->type) { | |
328 | case ARPHRD_ETHER: | |
329 | case ARPHRD_IEEE802: /* Not sure. Check it later. --ANK */ | |
330 | case ARPHRD_FDDI: | |
331 | ipv6_eth_mc_map(addr, buf); | |
332 | return 0; | |
333 | case ARPHRD_IEEE802_TR: | |
334 | ipv6_tr_mc_map(addr,buf); | |
335 | return 0; | |
336 | case ARPHRD_ARCNET: | |
337 | ipv6_arcnet_mc_map(addr, buf); | |
338 | return 0; | |
339 | case ARPHRD_INFINIBAND: | |
340 | ipv6_ib_mc_map(addr, buf); | |
341 | return 0; | |
342 | default: | |
343 | if (dir) { | |
344 | memcpy(buf, dev->broadcast, dev->addr_len); | |
345 | return 0; | |
346 | } | |
347 | } | |
348 | return -EINVAL; | |
349 | } | |
350 | ||
7159039a YH |
351 | EXPORT_SYMBOL(ndisc_mc_map); |
352 | ||
1da177e4 LT |
353 | static u32 ndisc_hash(const void *pkey, const struct net_device *dev) |
354 | { | |
355 | const u32 *p32 = pkey; | |
356 | u32 addr_hash, i; | |
357 | ||
358 | addr_hash = 0; | |
359 | for (i = 0; i < (sizeof(struct in6_addr) / sizeof(u32)); i++) | |
360 | addr_hash ^= *p32++; | |
361 | ||
362 | return jhash_2words(addr_hash, dev->ifindex, nd_tbl.hash_rnd); | |
363 | } | |
364 | ||
365 | static int ndisc_constructor(struct neighbour *neigh) | |
366 | { | |
367 | struct in6_addr *addr = (struct in6_addr*)&neigh->primary_key; | |
368 | struct net_device *dev = neigh->dev; | |
369 | struct inet6_dev *in6_dev; | |
370 | struct neigh_parms *parms; | |
371 | int is_multicast = ipv6_addr_is_multicast(addr); | |
372 | ||
373 | rcu_read_lock(); | |
374 | in6_dev = in6_dev_get(dev); | |
375 | if (in6_dev == NULL) { | |
376 | rcu_read_unlock(); | |
377 | return -EINVAL; | |
378 | } | |
379 | ||
380 | parms = in6_dev->nd_parms; | |
381 | __neigh_parms_put(neigh->parms); | |
382 | neigh->parms = neigh_parms_clone(parms); | |
383 | rcu_read_unlock(); | |
384 | ||
385 | neigh->type = is_multicast ? RTN_MULTICAST : RTN_UNICAST; | |
3b04ddde | 386 | if (!dev->header_ops) { |
1da177e4 LT |
387 | neigh->nud_state = NUD_NOARP; |
388 | neigh->ops = &ndisc_direct_ops; | |
389 | neigh->output = neigh->ops->queue_xmit; | |
390 | } else { | |
391 | if (is_multicast) { | |
392 | neigh->nud_state = NUD_NOARP; | |
393 | ndisc_mc_map(addr, neigh->ha, dev, 1); | |
394 | } else if (dev->flags&(IFF_NOARP|IFF_LOOPBACK)) { | |
395 | neigh->nud_state = NUD_NOARP; | |
396 | memcpy(neigh->ha, dev->dev_addr, dev->addr_len); | |
397 | if (dev->flags&IFF_LOOPBACK) | |
398 | neigh->type = RTN_LOCAL; | |
399 | } else if (dev->flags&IFF_POINTOPOINT) { | |
400 | neigh->nud_state = NUD_NOARP; | |
401 | memcpy(neigh->ha, dev->broadcast, dev->addr_len); | |
402 | } | |
3b04ddde | 403 | if (dev->header_ops->cache) |
1da177e4 LT |
404 | neigh->ops = &ndisc_hh_ops; |
405 | else | |
406 | neigh->ops = &ndisc_generic_ops; | |
407 | if (neigh->nud_state&NUD_VALID) | |
408 | neigh->output = neigh->ops->connected_output; | |
409 | else | |
410 | neigh->output = neigh->ops->output; | |
411 | } | |
412 | in6_dev_put(in6_dev); | |
413 | return 0; | |
414 | } | |
415 | ||
416 | static int pndisc_constructor(struct pneigh_entry *n) | |
417 | { | |
418 | struct in6_addr *addr = (struct in6_addr*)&n->key; | |
419 | struct in6_addr maddr; | |
420 | struct net_device *dev = n->dev; | |
421 | ||
422 | if (dev == NULL || __in6_dev_get(dev) == NULL) | |
423 | return -EINVAL; | |
424 | addrconf_addr_solict_mult(addr, &maddr); | |
425 | ipv6_dev_mc_inc(dev, &maddr); | |
426 | return 0; | |
427 | } | |
428 | ||
429 | static void pndisc_destructor(struct pneigh_entry *n) | |
430 | { | |
431 | struct in6_addr *addr = (struct in6_addr*)&n->key; | |
432 | struct in6_addr maddr; | |
433 | struct net_device *dev = n->dev; | |
434 | ||
435 | if (dev == NULL || __in6_dev_get(dev) == NULL) | |
436 | return; | |
437 | addrconf_addr_solict_mult(addr, &maddr); | |
438 | ipv6_dev_mc_dec(dev, &maddr); | |
439 | } | |
440 | ||
441 | /* | |
442 | * Send a Neighbour Advertisement | |
443 | */ | |
444 | ||
445 | static inline void ndisc_flow_init(struct flowi *fl, u8 type, | |
af184765 YH |
446 | struct in6_addr *saddr, struct in6_addr *daddr, |
447 | int oif) | |
1da177e4 LT |
448 | { |
449 | memset(fl, 0, sizeof(*fl)); | |
450 | ipv6_addr_copy(&fl->fl6_src, saddr); | |
451 | ipv6_addr_copy(&fl->fl6_dst, daddr); | |
452 | fl->proto = IPPROTO_ICMPV6; | |
453 | fl->fl_icmp_type = type; | |
454 | fl->fl_icmp_code = 0; | |
af184765 | 455 | fl->oif = oif; |
beb8d13b | 456 | security_sk_classify_flow(ndisc_socket->sk, fl); |
1da177e4 LT |
457 | } |
458 | ||
e1ec7842 YH |
459 | static void __ndisc_send(struct net_device *dev, |
460 | struct neighbour *neigh, | |
461 | struct in6_addr *daddr, struct in6_addr *saddr, | |
462 | struct icmp6hdr *icmp6h, struct in6_addr *target, | |
14878f75 | 463 | int llinfo) |
1da177e4 | 464 | { |
1da177e4 | 465 | struct flowi fl; |
e1ec7842 | 466 | struct dst_entry *dst; |
1ab1457c | 467 | struct sock *sk = ndisc_socket->sk; |
1ab1457c | 468 | struct sk_buff *skb; |
e1ec7842 YH |
469 | struct icmp6hdr *hdr; |
470 | struct inet6_dev *idev; | |
471 | int len; | |
1da177e4 | 472 | int err; |
14878f75 DS |
473 | u8 *opt, type; |
474 | ||
475 | type = icmp6h->icmp6_type; | |
1da177e4 | 476 | |
14878f75 | 477 | ndisc_flow_init(&fl, type, saddr, daddr, |
af184765 | 478 | dev->ifindex); |
1da177e4 LT |
479 | |
480 | dst = ndisc_dst_alloc(dev, neigh, daddr, ip6_output); | |
481 | if (!dst) | |
482 | return; | |
483 | ||
484 | err = xfrm_lookup(&dst, &fl, NULL, 0); | |
e104411b | 485 | if (err < 0) |
1da177e4 | 486 | return; |
1da177e4 | 487 | |
e1ec7842 YH |
488 | if (!dev->addr_len) |
489 | llinfo = 0; | |
490 | ||
491 | len = sizeof(struct icmp6hdr) + (target ? sizeof(*target) : 0); | |
492 | if (llinfo) | |
493 | len += ndisc_opt_addr_space(dev); | |
1da177e4 | 494 | |
d54a81d3 DM |
495 | skb = sock_alloc_send_skb(sk, |
496 | (MAX_HEADER + sizeof(struct ipv6hdr) + | |
497 | len + LL_RESERVED_SPACE(dev)), | |
1da177e4 | 498 | 1, &err); |
e1ec7842 | 499 | if (!skb) { |
1da177e4 | 500 | ND_PRINTK0(KERN_ERR |
e1ec7842 | 501 | "ICMPv6 ND: %s() failed to allocate an skb.\n", |
1da177e4 LT |
502 | __FUNCTION__); |
503 | dst_release(dst); | |
504 | return; | |
505 | } | |
506 | ||
507 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); | |
e1ec7842 | 508 | ip6_nd_hdr(sk, skb, dev, saddr, daddr, IPPROTO_ICMPV6, len); |
1da177e4 | 509 | |
27a884dc | 510 | skb->transport_header = skb->tail; |
d10ba34b | 511 | skb_put(skb, len); |
1da177e4 | 512 | |
e1ec7842 YH |
513 | hdr = (struct icmp6hdr *)skb_transport_header(skb); |
514 | memcpy(hdr, icmp6h, sizeof(*hdr)); | |
1da177e4 | 515 | |
e1ec7842 YH |
516 | opt = skb_transport_header(skb) + sizeof(struct icmp6hdr); |
517 | if (target) { | |
518 | ipv6_addr_copy((struct in6_addr *)opt, target); | |
519 | opt += sizeof(*target); | |
520 | } | |
1da177e4 | 521 | |
e1ec7842 YH |
522 | if (llinfo) |
523 | ndisc_fill_addr_option(opt, llinfo, dev->dev_addr, | |
1da177e4 LT |
524 | dev->addr_len, dev->type); |
525 | ||
e1ec7842 YH |
526 | hdr->icmp6_cksum = csum_ipv6_magic(saddr, daddr, len, |
527 | IPPROTO_ICMPV6, | |
528 | csum_partial((__u8 *) hdr, | |
529 | len, 0)); | |
1da177e4 LT |
530 | |
531 | skb->dst = dst; | |
e1ec7842 | 532 | |
1da177e4 | 533 | idev = in6_dev_get(dst->dev); |
a11d206d | 534 | IP6_INC_STATS(idev, IPSTATS_MIB_OUTREQUESTS); |
e1ec7842 | 535 | |
1da177e4 LT |
536 | err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, dst->dev, dst_output); |
537 | if (!err) { | |
14878f75 | 538 | ICMP6MSGOUT_INC_STATS(idev, type); |
1da177e4 LT |
539 | ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS); |
540 | } | |
541 | ||
542 | if (likely(idev != NULL)) | |
543 | in6_dev_put(idev); | |
1ab1457c | 544 | } |
1da177e4 | 545 | |
e1ec7842 YH |
546 | static void ndisc_send_na(struct net_device *dev, struct neighbour *neigh, |
547 | struct in6_addr *daddr, struct in6_addr *solicited_addr, | |
548 | int router, int solicited, int override, int inc_opt) | |
549 | { | |
550 | struct in6_addr tmpaddr; | |
551 | struct inet6_ifaddr *ifp; | |
552 | struct in6_addr *src_addr; | |
553 | struct icmp6hdr icmp6h = { | |
554 | .icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT, | |
555 | }; | |
556 | ||
557 | /* for anycast or proxy, solicited_addr != src_addr */ | |
558 | ifp = ipv6_get_ifaddr(solicited_addr, dev, 1); | |
559 | if (ifp) { | |
560 | src_addr = solicited_addr; | |
561 | if (ifp->flags & IFA_F_OPTIMISTIC) | |
562 | override = 0; | |
563 | in6_ifa_put(ifp); | |
564 | } else { | |
565 | if (ipv6_dev_get_saddr(dev, daddr, &tmpaddr)) | |
566 | return; | |
567 | src_addr = &tmpaddr; | |
568 | } | |
569 | ||
570 | icmp6h.icmp6_router = router; | |
571 | icmp6h.icmp6_solicited = solicited; | |
572 | icmp6h.icmp6_override = override; | |
573 | ||
574 | __ndisc_send(dev, neigh, daddr, src_addr, | |
575 | &icmp6h, solicited_addr, | |
14878f75 | 576 | inc_opt ? ND_OPT_TARGET_LL_ADDR : 0); |
e1ec7842 YH |
577 | } |
578 | ||
1da177e4 LT |
579 | void ndisc_send_ns(struct net_device *dev, struct neighbour *neigh, |
580 | struct in6_addr *solicit, | |
1ab1457c | 581 | struct in6_addr *daddr, struct in6_addr *saddr) |
1da177e4 | 582 | { |
1da177e4 | 583 | struct in6_addr addr_buf; |
e1ec7842 YH |
584 | struct icmp6hdr icmp6h = { |
585 | .icmp6_type = NDISC_NEIGHBOUR_SOLICITATION, | |
586 | }; | |
1da177e4 LT |
587 | |
588 | if (saddr == NULL) { | |
95c385b4 NH |
589 | if (ipv6_get_lladdr(dev, &addr_buf, |
590 | (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC))) | |
1da177e4 LT |
591 | return; |
592 | saddr = &addr_buf; | |
593 | } | |
594 | ||
e1ec7842 YH |
595 | __ndisc_send(dev, neigh, daddr, saddr, |
596 | &icmp6h, solicit, | |
14878f75 | 597 | !ipv6_addr_any(saddr) ? ND_OPT_SOURCE_LL_ADDR : 0); |
1da177e4 LT |
598 | } |
599 | ||
600 | void ndisc_send_rs(struct net_device *dev, struct in6_addr *saddr, | |
601 | struct in6_addr *daddr) | |
602 | { | |
e1ec7842 YH |
603 | struct icmp6hdr icmp6h = { |
604 | .icmp6_type = NDISC_ROUTER_SOLICITATION, | |
605 | }; | |
95c385b4 | 606 | int send_sllao = dev->addr_len; |
95c385b4 NH |
607 | |
608 | #ifdef CONFIG_IPV6_OPTIMISTIC_DAD | |
609 | /* | |
610 | * According to section 2.2 of RFC 4429, we must not | |
611 | * send router solicitations with a sllao from | |
612 | * optimistic addresses, but we may send the solicitation | |
613 | * if we don't include the sllao. So here we check | |
614 | * if our address is optimistic, and if so, we | |
615 | * supress the inclusion of the sllao. | |
616 | */ | |
617 | if (send_sllao) { | |
ca043569 | 618 | struct inet6_ifaddr *ifp = ipv6_get_ifaddr(saddr, dev, 1); |
95c385b4 NH |
619 | if (ifp) { |
620 | if (ifp->flags & IFA_F_OPTIMISTIC) { | |
ca043569 | 621 | send_sllao = 0; |
95c385b4 | 622 | } |
ca043569 | 623 | in6_ifa_put(ifp); |
95c385b4 NH |
624 | } else { |
625 | send_sllao = 0; | |
626 | } | |
627 | } | |
628 | #endif | |
e1ec7842 YH |
629 | __ndisc_send(dev, NULL, daddr, saddr, |
630 | &icmp6h, NULL, | |
14878f75 | 631 | send_sllao ? ND_OPT_SOURCE_LL_ADDR : 0); |
1da177e4 | 632 | } |
1ab1457c | 633 | |
1da177e4 LT |
634 | |
635 | static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb) | |
636 | { | |
637 | /* | |
638 | * "The sender MUST return an ICMP | |
639 | * destination unreachable" | |
640 | */ | |
641 | dst_link_failure(skb); | |
642 | kfree_skb(skb); | |
643 | } | |
644 | ||
645 | /* Called with locked neigh: either read or both */ | |
646 | ||
647 | static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb) | |
648 | { | |
649 | struct in6_addr *saddr = NULL; | |
650 | struct in6_addr mcaddr; | |
651 | struct net_device *dev = neigh->dev; | |
652 | struct in6_addr *target = (struct in6_addr *)&neigh->primary_key; | |
653 | int probes = atomic_read(&neigh->probes); | |
654 | ||
0660e03f ACM |
655 | if (skb && ipv6_chk_addr(&ipv6_hdr(skb)->saddr, dev, 1)) |
656 | saddr = &ipv6_hdr(skb)->saddr; | |
1da177e4 LT |
657 | |
658 | if ((probes -= neigh->parms->ucast_probes) < 0) { | |
659 | if (!(neigh->nud_state & NUD_VALID)) { | |
660 | ND_PRINTK1(KERN_DEBUG | |
661 | "%s(): trying to ucast probe in NUD_INVALID: " | |
46b86a2d | 662 | NIP6_FMT "\n", |
1da177e4 LT |
663 | __FUNCTION__, |
664 | NIP6(*target)); | |
665 | } | |
666 | ndisc_send_ns(dev, neigh, target, target, saddr); | |
667 | } else if ((probes -= neigh->parms->app_probes) < 0) { | |
668 | #ifdef CONFIG_ARPD | |
669 | neigh_app_ns(neigh); | |
670 | #endif | |
671 | } else { | |
672 | addrconf_addr_solict_mult(target, &mcaddr); | |
673 | ndisc_send_ns(dev, NULL, target, &mcaddr, saddr); | |
674 | } | |
675 | } | |
676 | ||
677 | static void ndisc_recv_ns(struct sk_buff *skb) | |
678 | { | |
9c70220b | 679 | struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb); |
0660e03f ACM |
680 | struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; |
681 | struct in6_addr *daddr = &ipv6_hdr(skb)->daddr; | |
1da177e4 | 682 | u8 *lladdr = NULL; |
27a884dc ACM |
683 | u32 ndoptlen = skb->tail - (skb->transport_header + |
684 | offsetof(struct nd_msg, opt)); | |
1da177e4 LT |
685 | struct ndisc_options ndopts; |
686 | struct net_device *dev = skb->dev; | |
687 | struct inet6_ifaddr *ifp; | |
688 | struct inet6_dev *idev = NULL; | |
689 | struct neighbour *neigh; | |
62dd9318 | 690 | struct pneigh_entry *pneigh = NULL; |
1da177e4 LT |
691 | int dad = ipv6_addr_any(saddr); |
692 | int inc; | |
62dd9318 | 693 | int is_router; |
1da177e4 LT |
694 | |
695 | if (ipv6_addr_is_multicast(&msg->target)) { | |
1ab1457c | 696 | ND_PRINTK2(KERN_WARNING |
1da177e4 LT |
697 | "ICMPv6 NS: multicast target address"); |
698 | return; | |
699 | } | |
700 | ||
701 | /* | |
702 | * RFC2461 7.1.1: | |
703 | * DAD has to be destined for solicited node multicast address. | |
704 | */ | |
705 | if (dad && | |
706 | !(daddr->s6_addr32[0] == htonl(0xff020000) && | |
707 | daddr->s6_addr32[1] == htonl(0x00000000) && | |
708 | daddr->s6_addr32[2] == htonl(0x00000001) && | |
709 | daddr->s6_addr [12] == 0xff )) { | |
710 | ND_PRINTK2(KERN_WARNING | |
711 | "ICMPv6 NS: bad DAD packet (wrong destination)\n"); | |
712 | return; | |
713 | } | |
714 | ||
715 | if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) { | |
1ab1457c | 716 | ND_PRINTK2(KERN_WARNING |
1da177e4 LT |
717 | "ICMPv6 NS: invalid ND options\n"); |
718 | return; | |
719 | } | |
720 | ||
721 | if (ndopts.nd_opts_src_lladdr) { | |
722 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, dev); | |
723 | if (!lladdr) { | |
724 | ND_PRINTK2(KERN_WARNING | |
725 | "ICMPv6 NS: invalid link-layer address length\n"); | |
726 | return; | |
727 | } | |
728 | ||
729 | /* RFC2461 7.1.1: | |
1ab1457c YH |
730 | * If the IP source address is the unspecified address, |
731 | * there MUST NOT be source link-layer address option | |
1da177e4 LT |
732 | * in the message. |
733 | */ | |
734 | if (dad) { | |
1ab1457c | 735 | ND_PRINTK2(KERN_WARNING |
1da177e4 LT |
736 | "ICMPv6 NS: bad DAD packet (link-layer address option)\n"); |
737 | return; | |
738 | } | |
739 | } | |
740 | ||
741 | inc = ipv6_addr_is_multicast(daddr); | |
742 | ||
743 | if ((ifp = ipv6_get_ifaddr(&msg->target, dev, 1)) != NULL) { | |
95c385b4 NH |
744 | |
745 | if (ifp->flags & (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC)) { | |
746 | if (dad) { | |
747 | if (dev->type == ARPHRD_IEEE802_TR) { | |
98e399f8 ACM |
748 | const unsigned char *sadr; |
749 | sadr = skb_mac_header(skb); | |
95c385b4 NH |
750 | if (((sadr[8] ^ dev->dev_addr[0]) & 0x7f) == 0 && |
751 | sadr[9] == dev->dev_addr[1] && | |
752 | sadr[10] == dev->dev_addr[2] && | |
753 | sadr[11] == dev->dev_addr[3] && | |
754 | sadr[12] == dev->dev_addr[4] && | |
755 | sadr[13] == dev->dev_addr[5]) { | |
756 | /* looped-back to us */ | |
757 | goto out; | |
758 | } | |
759 | } | |
760 | ||
761 | /* | |
762 | * We are colliding with another node | |
763 | * who is doing DAD | |
764 | * so fail our DAD process | |
765 | */ | |
766 | addrconf_dad_failure(ifp); | |
9e3be4b3 | 767 | return; |
95c385b4 NH |
768 | } else { |
769 | /* | |
770 | * This is not a dad solicitation. | |
771 | * If we are an optimistic node, | |
772 | * we should respond. | |
773 | * Otherwise, we should ignore it. | |
774 | */ | |
775 | if (!(ifp->flags & IFA_F_OPTIMISTIC)) | |
1da177e4 | 776 | goto out; |
1da177e4 | 777 | } |
1da177e4 LT |
778 | } |
779 | ||
780 | idev = ifp->idev; | |
781 | } else { | |
782 | idev = in6_dev_get(dev); | |
783 | if (!idev) { | |
784 | /* XXX: count this drop? */ | |
785 | return; | |
786 | } | |
787 | ||
788 | if (ipv6_chk_acast_addr(dev, &msg->target) || | |
1ab1457c | 789 | (idev->cnf.forwarding && |
fbea49e1 | 790 | (ipv6_devconf.proxy_ndp || idev->cnf.proxy_ndp) && |
62dd9318 VN |
791 | (pneigh = pneigh_lookup(&nd_tbl, |
792 | &msg->target, dev, 0)) != NULL)) { | |
a61bbcf2 | 793 | if (!(NEIGH_CB(skb)->flags & LOCALLY_ENQUEUED) && |
1da177e4 LT |
794 | skb->pkt_type != PACKET_HOST && |
795 | inc != 0 && | |
796 | idev->nd_parms->proxy_delay != 0) { | |
797 | /* | |
798 | * for anycast or proxy, | |
1ab1457c YH |
799 | * sender should delay its response |
800 | * by a random time between 0 and | |
1da177e4 LT |
801 | * MAX_ANYCAST_DELAY_TIME seconds. |
802 | * (RFC2461) -- yoshfuji | |
803 | */ | |
804 | struct sk_buff *n = skb_clone(skb, GFP_ATOMIC); | |
805 | if (n) | |
806 | pneigh_enqueue(&nd_tbl, idev->nd_parms, n); | |
807 | goto out; | |
808 | } | |
809 | } else | |
810 | goto out; | |
811 | } | |
812 | ||
fc26d0ab | 813 | is_router = !!(pneigh ? pneigh->flags & NTF_ROUTER : idev->cnf.forwarding); |
62dd9318 | 814 | |
1da177e4 LT |
815 | if (dad) { |
816 | struct in6_addr maddr; | |
817 | ||
818 | ipv6_addr_all_nodes(&maddr); | |
819 | ndisc_send_na(dev, NULL, &maddr, &msg->target, | |
62dd9318 | 820 | is_router, 0, (ifp != NULL), 1); |
1da177e4 LT |
821 | goto out; |
822 | } | |
823 | ||
824 | if (inc) | |
825 | NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_mcast); | |
826 | else | |
827 | NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_ucast); | |
828 | ||
1ab1457c | 829 | /* |
1da177e4 LT |
830 | * update / create cache entry |
831 | * for the source address | |
832 | */ | |
833 | neigh = __neigh_lookup(&nd_tbl, saddr, dev, | |
834 | !inc || lladdr || !dev->addr_len); | |
835 | if (neigh) | |
1ab1457c | 836 | neigh_update(neigh, lladdr, NUD_STALE, |
1da177e4 LT |
837 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
838 | NEIGH_UPDATE_F_OVERRIDE); | |
3b04ddde | 839 | if (neigh || !dev->header_ops) { |
1da177e4 | 840 | ndisc_send_na(dev, neigh, saddr, &msg->target, |
62dd9318 | 841 | is_router, |
1da177e4 LT |
842 | 1, (ifp != NULL && inc), inc); |
843 | if (neigh) | |
844 | neigh_release(neigh); | |
845 | } | |
846 | ||
847 | out: | |
848 | if (ifp) | |
849 | in6_ifa_put(ifp); | |
850 | else | |
851 | in6_dev_put(idev); | |
852 | ||
853 | return; | |
854 | } | |
855 | ||
856 | static void ndisc_recv_na(struct sk_buff *skb) | |
857 | { | |
9c70220b | 858 | struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb); |
0660e03f ACM |
859 | struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; |
860 | struct in6_addr *daddr = &ipv6_hdr(skb)->daddr; | |
1da177e4 | 861 | u8 *lladdr = NULL; |
27a884dc ACM |
862 | u32 ndoptlen = skb->tail - (skb->transport_header + |
863 | offsetof(struct nd_msg, opt)); | |
1da177e4 LT |
864 | struct ndisc_options ndopts; |
865 | struct net_device *dev = skb->dev; | |
866 | struct inet6_ifaddr *ifp; | |
867 | struct neighbour *neigh; | |
868 | ||
869 | if (skb->len < sizeof(struct nd_msg)) { | |
870 | ND_PRINTK2(KERN_WARNING | |
871 | "ICMPv6 NA: packet too short\n"); | |
872 | return; | |
873 | } | |
874 | ||
875 | if (ipv6_addr_is_multicast(&msg->target)) { | |
876 | ND_PRINTK2(KERN_WARNING | |
877 | "ICMPv6 NA: target address is multicast.\n"); | |
878 | return; | |
879 | } | |
880 | ||
881 | if (ipv6_addr_is_multicast(daddr) && | |
882 | msg->icmph.icmp6_solicited) { | |
883 | ND_PRINTK2(KERN_WARNING | |
884 | "ICMPv6 NA: solicited NA is multicasted.\n"); | |
885 | return; | |
886 | } | |
1ab1457c | 887 | |
1da177e4 LT |
888 | if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) { |
889 | ND_PRINTK2(KERN_WARNING | |
890 | "ICMPv6 NS: invalid ND option\n"); | |
891 | return; | |
892 | } | |
893 | if (ndopts.nd_opts_tgt_lladdr) { | |
894 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, dev); | |
895 | if (!lladdr) { | |
896 | ND_PRINTK2(KERN_WARNING | |
897 | "ICMPv6 NA: invalid link-layer address length\n"); | |
898 | return; | |
899 | } | |
900 | } | |
901 | if ((ifp = ipv6_get_ifaddr(&msg->target, dev, 1))) { | |
902 | if (ifp->flags & IFA_F_TENTATIVE) { | |
903 | addrconf_dad_failure(ifp); | |
904 | return; | |
905 | } | |
906 | /* What should we make now? The advertisement | |
907 | is invalid, but ndisc specs say nothing | |
908 | about it. It could be misconfiguration, or | |
909 | an smart proxy agent tries to help us :-) | |
910 | */ | |
911 | ND_PRINTK1(KERN_WARNING | |
912 | "ICMPv6 NA: someone advertises our address on %s!\n", | |
913 | ifp->idev->dev->name); | |
914 | in6_ifa_put(ifp); | |
915 | return; | |
916 | } | |
917 | neigh = neigh_lookup(&nd_tbl, &msg->target, dev); | |
918 | ||
919 | if (neigh) { | |
920 | u8 old_flags = neigh->flags; | |
921 | ||
922 | if (neigh->nud_state & NUD_FAILED) | |
923 | goto out; | |
924 | ||
5f3e6e9e VN |
925 | /* |
926 | * Don't update the neighbor cache entry on a proxy NA from | |
927 | * ourselves because either the proxied node is off link or it | |
928 | * has already sent a NA to us. | |
929 | */ | |
930 | if (lladdr && !memcmp(lladdr, dev->dev_addr, dev->addr_len) && | |
fbea49e1 YH |
931 | ipv6_devconf.forwarding && ipv6_devconf.proxy_ndp && |
932 | pneigh_lookup(&nd_tbl, &msg->target, dev, 0)) { | |
933 | /* XXX: idev->cnf.prixy_ndp */ | |
5f3e6e9e | 934 | goto out; |
fbea49e1 | 935 | } |
5f3e6e9e | 936 | |
1da177e4 LT |
937 | neigh_update(neigh, lladdr, |
938 | msg->icmph.icmp6_solicited ? NUD_REACHABLE : NUD_STALE, | |
939 | NEIGH_UPDATE_F_WEAK_OVERRIDE| | |
940 | (msg->icmph.icmp6_override ? NEIGH_UPDATE_F_OVERRIDE : 0)| | |
941 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
942 | (msg->icmph.icmp6_router ? NEIGH_UPDATE_F_ISROUTER : 0)); | |
943 | ||
944 | if ((old_flags & ~neigh->flags) & NTF_ROUTER) { | |
945 | /* | |
946 | * Change: router to host | |
947 | */ | |
948 | struct rt6_info *rt; | |
949 | rt = rt6_get_dflt_router(saddr, dev); | |
950 | if (rt) | |
e0a1ad73 | 951 | ip6_del_rt(rt); |
1da177e4 LT |
952 | } |
953 | ||
954 | out: | |
955 | neigh_release(neigh); | |
956 | } | |
957 | } | |
958 | ||
959 | static void ndisc_recv_rs(struct sk_buff *skb) | |
960 | { | |
9c70220b | 961 | struct rs_msg *rs_msg = (struct rs_msg *)skb_transport_header(skb); |
1da177e4 LT |
962 | unsigned long ndoptlen = skb->len - sizeof(*rs_msg); |
963 | struct neighbour *neigh; | |
964 | struct inet6_dev *idev; | |
0660e03f | 965 | struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; |
1da177e4 LT |
966 | struct ndisc_options ndopts; |
967 | u8 *lladdr = NULL; | |
968 | ||
969 | if (skb->len < sizeof(*rs_msg)) | |
970 | return; | |
971 | ||
972 | idev = in6_dev_get(skb->dev); | |
973 | if (!idev) { | |
974 | if (net_ratelimit()) | |
975 | ND_PRINTK1("ICMP6 RS: can't find in6 device\n"); | |
976 | return; | |
977 | } | |
978 | ||
979 | /* Don't accept RS if we're not in router mode */ | |
980 | if (!idev->cnf.forwarding) | |
981 | goto out; | |
982 | ||
983 | /* | |
984 | * Don't update NCE if src = ::; | |
985 | * this implies that the source node has no ip address assigned yet. | |
986 | */ | |
987 | if (ipv6_addr_any(saddr)) | |
988 | goto out; | |
989 | ||
990 | /* Parse ND options */ | |
991 | if (!ndisc_parse_options(rs_msg->opt, ndoptlen, &ndopts)) { | |
992 | if (net_ratelimit()) | |
993 | ND_PRINTK2("ICMP6 NS: invalid ND option, ignored\n"); | |
994 | goto out; | |
995 | } | |
996 | ||
997 | if (ndopts.nd_opts_src_lladdr) { | |
998 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, | |
999 | skb->dev); | |
1000 | if (!lladdr) | |
1001 | goto out; | |
1002 | } | |
1003 | ||
1004 | neigh = __neigh_lookup(&nd_tbl, saddr, skb->dev, 1); | |
1005 | if (neigh) { | |
1006 | neigh_update(neigh, lladdr, NUD_STALE, | |
1007 | NEIGH_UPDATE_F_WEAK_OVERRIDE| | |
1008 | NEIGH_UPDATE_F_OVERRIDE| | |
1009 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER); | |
1010 | neigh_release(neigh); | |
1011 | } | |
1012 | out: | |
1013 | in6_dev_put(idev); | |
1014 | } | |
1015 | ||
31910575 PY |
1016 | static void ndisc_ra_useropt(struct sk_buff *ra, struct nd_opt_hdr *opt) |
1017 | { | |
1018 | struct icmp6hdr *icmp6h = (struct icmp6hdr *)skb_transport_header(ra); | |
1019 | struct sk_buff *skb; | |
1020 | struct nlmsghdr *nlh; | |
1021 | struct nduseroptmsg *ndmsg; | |
1022 | int err; | |
1023 | int base_size = NLMSG_ALIGN(sizeof(struct nduseroptmsg) | |
1024 | + (opt->nd_opt_len << 3)); | |
1025 | size_t msg_size = base_size + nla_total_size(sizeof(struct in6_addr)); | |
1026 | ||
1027 | skb = nlmsg_new(msg_size, GFP_ATOMIC); | |
1028 | if (skb == NULL) { | |
1029 | err = -ENOBUFS; | |
1030 | goto errout; | |
1031 | } | |
1032 | ||
1033 | nlh = nlmsg_put(skb, 0, 0, RTM_NEWNDUSEROPT, base_size, 0); | |
1034 | if (nlh == NULL) { | |
1035 | goto nla_put_failure; | |
1036 | } | |
1037 | ||
1038 | ndmsg = nlmsg_data(nlh); | |
1039 | ndmsg->nduseropt_family = AF_INET6; | |
1040 | ndmsg->nduseropt_icmp_type = icmp6h->icmp6_type; | |
1041 | ndmsg->nduseropt_icmp_code = icmp6h->icmp6_code; | |
1042 | ndmsg->nduseropt_opts_len = opt->nd_opt_len << 3; | |
1043 | ||
1044 | memcpy(ndmsg + 1, opt, opt->nd_opt_len << 3); | |
1045 | ||
1046 | NLA_PUT(skb, NDUSEROPT_SRCADDR, sizeof(struct in6_addr), | |
1047 | &ipv6_hdr(ra)->saddr); | |
1048 | nlmsg_end(skb, nlh); | |
1049 | ||
1050 | err = rtnl_notify(skb, 0, RTNLGRP_ND_USEROPT, NULL, GFP_ATOMIC); | |
1051 | if (err < 0) | |
1052 | goto errout; | |
1053 | ||
1054 | return; | |
1055 | ||
1056 | nla_put_failure: | |
1057 | nlmsg_free(skb); | |
1058 | err = -EMSGSIZE; | |
1059 | errout: | |
1060 | rtnl_set_sk_err(RTNLGRP_ND_USEROPT, err); | |
1061 | } | |
1062 | ||
1da177e4 LT |
1063 | static void ndisc_router_discovery(struct sk_buff *skb) |
1064 | { | |
9c70220b | 1065 | struct ra_msg *ra_msg = (struct ra_msg *)skb_transport_header(skb); |
1da177e4 LT |
1066 | struct neighbour *neigh = NULL; |
1067 | struct inet6_dev *in6_dev; | |
65f5c7c1 | 1068 | struct rt6_info *rt = NULL; |
1da177e4 LT |
1069 | int lifetime; |
1070 | struct ndisc_options ndopts; | |
1071 | int optlen; | |
ebacaaa0 | 1072 | unsigned int pref = 0; |
1da177e4 LT |
1073 | |
1074 | __u8 * opt = (__u8 *)(ra_msg + 1); | |
1075 | ||
27a884dc | 1076 | optlen = (skb->tail - skb->transport_header) - sizeof(struct ra_msg); |
1da177e4 | 1077 | |
0660e03f | 1078 | if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) { |
1da177e4 LT |
1079 | ND_PRINTK2(KERN_WARNING |
1080 | "ICMPv6 RA: source address is not link-local.\n"); | |
1081 | return; | |
1082 | } | |
1083 | if (optlen < 0) { | |
1ab1457c | 1084 | ND_PRINTK2(KERN_WARNING |
1da177e4 LT |
1085 | "ICMPv6 RA: packet too short\n"); |
1086 | return; | |
1087 | } | |
1088 | ||
1089 | /* | |
1090 | * set the RA_RECV flag in the interface | |
1091 | */ | |
1092 | ||
1093 | in6_dev = in6_dev_get(skb->dev); | |
1094 | if (in6_dev == NULL) { | |
1095 | ND_PRINTK0(KERN_ERR | |
1096 | "ICMPv6 RA: can't find inet6 device for %s.\n", | |
1097 | skb->dev->name); | |
1098 | return; | |
1099 | } | |
1100 | if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_ra) { | |
1101 | in6_dev_put(in6_dev); | |
1102 | return; | |
1103 | } | |
1104 | ||
1105 | if (!ndisc_parse_options(opt, optlen, &ndopts)) { | |
1106 | in6_dev_put(in6_dev); | |
1107 | ND_PRINTK2(KERN_WARNING | |
1108 | "ICMP6 RA: invalid ND options\n"); | |
1109 | return; | |
1110 | } | |
1111 | ||
1112 | if (in6_dev->if_flags & IF_RS_SENT) { | |
1113 | /* | |
1114 | * flag that an RA was received after an RS was sent | |
1115 | * out on this interface. | |
1116 | */ | |
1117 | in6_dev->if_flags |= IF_RA_RCVD; | |
1118 | } | |
1119 | ||
1120 | /* | |
1121 | * Remember the managed/otherconf flags from most recently | |
1122 | * received RA message (RFC 2462) -- yoshfuji | |
1123 | */ | |
1124 | in6_dev->if_flags = (in6_dev->if_flags & ~(IF_RA_MANAGED | | |
1125 | IF_RA_OTHERCONF)) | | |
1126 | (ra_msg->icmph.icmp6_addrconf_managed ? | |
1127 | IF_RA_MANAGED : 0) | | |
1128 | (ra_msg->icmph.icmp6_addrconf_other ? | |
1129 | IF_RA_OTHERCONF : 0); | |
1130 | ||
65f5c7c1 YH |
1131 | if (!in6_dev->cnf.accept_ra_defrtr) |
1132 | goto skip_defrtr; | |
1133 | ||
1da177e4 LT |
1134 | lifetime = ntohs(ra_msg->icmph.icmp6_rt_lifetime); |
1135 | ||
ebacaaa0 YH |
1136 | #ifdef CONFIG_IPV6_ROUTER_PREF |
1137 | pref = ra_msg->icmph.icmp6_router_pref; | |
1138 | /* 10b is handled as if it were 00b (medium) */ | |
930d6ff2 | 1139 | if (pref == ICMPV6_ROUTER_PREF_INVALID || |
6d5b78cd | 1140 | !in6_dev->cnf.accept_ra_rtr_pref) |
ebacaaa0 YH |
1141 | pref = ICMPV6_ROUTER_PREF_MEDIUM; |
1142 | #endif | |
1143 | ||
0660e03f | 1144 | rt = rt6_get_dflt_router(&ipv6_hdr(skb)->saddr, skb->dev); |
1da177e4 LT |
1145 | |
1146 | if (rt) | |
1147 | neigh = rt->rt6i_nexthop; | |
1148 | ||
1149 | if (rt && lifetime == 0) { | |
1150 | neigh_clone(neigh); | |
e0a1ad73 | 1151 | ip6_del_rt(rt); |
1da177e4 LT |
1152 | rt = NULL; |
1153 | } | |
1154 | ||
1155 | if (rt == NULL && lifetime) { | |
1156 | ND_PRINTK3(KERN_DEBUG | |
1157 | "ICMPv6 RA: adding default router.\n"); | |
1158 | ||
0660e03f | 1159 | rt = rt6_add_dflt_router(&ipv6_hdr(skb)->saddr, skb->dev, pref); |
1da177e4 LT |
1160 | if (rt == NULL) { |
1161 | ND_PRINTK0(KERN_ERR | |
1162 | "ICMPv6 RA: %s() failed to add default route.\n", | |
1163 | __FUNCTION__); | |
1164 | in6_dev_put(in6_dev); | |
1165 | return; | |
1166 | } | |
1167 | ||
1168 | neigh = rt->rt6i_nexthop; | |
1169 | if (neigh == NULL) { | |
1170 | ND_PRINTK0(KERN_ERR | |
1171 | "ICMPv6 RA: %s() got default router without neighbour.\n", | |
1172 | __FUNCTION__); | |
1173 | dst_release(&rt->u.dst); | |
1174 | in6_dev_put(in6_dev); | |
1175 | return; | |
1176 | } | |
1177 | neigh->flags |= NTF_ROUTER; | |
ebacaaa0 YH |
1178 | } else if (rt) { |
1179 | rt->rt6i_flags |= (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); | |
1da177e4 LT |
1180 | } |
1181 | ||
1182 | if (rt) | |
1183 | rt->rt6i_expires = jiffies + (HZ * lifetime); | |
1184 | ||
1185 | if (ra_msg->icmph.icmp6_hop_limit) { | |
1186 | in6_dev->cnf.hop_limit = ra_msg->icmph.icmp6_hop_limit; | |
1187 | if (rt) | |
1188 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = ra_msg->icmph.icmp6_hop_limit; | |
1189 | } | |
1190 | ||
65f5c7c1 YH |
1191 | skip_defrtr: |
1192 | ||
1da177e4 LT |
1193 | /* |
1194 | * Update Reachable Time and Retrans Timer | |
1195 | */ | |
1196 | ||
1197 | if (in6_dev->nd_parms) { | |
1198 | unsigned long rtime = ntohl(ra_msg->retrans_timer); | |
1199 | ||
1200 | if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/HZ) { | |
1201 | rtime = (rtime*HZ)/1000; | |
1202 | if (rtime < HZ/10) | |
1203 | rtime = HZ/10; | |
1204 | in6_dev->nd_parms->retrans_time = rtime; | |
1205 | in6_dev->tstamp = jiffies; | |
1206 | inet6_ifinfo_notify(RTM_NEWLINK, in6_dev); | |
1207 | } | |
1208 | ||
1209 | rtime = ntohl(ra_msg->reachable_time); | |
1210 | if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/(3*HZ)) { | |
1211 | rtime = (rtime*HZ)/1000; | |
1212 | ||
1213 | if (rtime < HZ/10) | |
1214 | rtime = HZ/10; | |
1215 | ||
1216 | if (rtime != in6_dev->nd_parms->base_reachable_time) { | |
1217 | in6_dev->nd_parms->base_reachable_time = rtime; | |
1218 | in6_dev->nd_parms->gc_staletime = 3 * rtime; | |
1219 | in6_dev->nd_parms->reachable_time = neigh_rand_reach_time(rtime); | |
1220 | in6_dev->tstamp = jiffies; | |
1221 | inet6_ifinfo_notify(RTM_NEWLINK, in6_dev); | |
1222 | } | |
1223 | } | |
1224 | } | |
1225 | ||
1226 | /* | |
1227 | * Process options. | |
1228 | */ | |
1229 | ||
1230 | if (!neigh) | |
0660e03f | 1231 | neigh = __neigh_lookup(&nd_tbl, &ipv6_hdr(skb)->saddr, |
1da177e4 LT |
1232 | skb->dev, 1); |
1233 | if (neigh) { | |
1234 | u8 *lladdr = NULL; | |
1235 | if (ndopts.nd_opts_src_lladdr) { | |
1236 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, | |
1237 | skb->dev); | |
1238 | if (!lladdr) { | |
1239 | ND_PRINTK2(KERN_WARNING | |
1240 | "ICMPv6 RA: invalid link-layer address length\n"); | |
1241 | goto out; | |
1242 | } | |
1243 | } | |
1244 | neigh_update(neigh, lladdr, NUD_STALE, | |
1245 | NEIGH_UPDATE_F_WEAK_OVERRIDE| | |
1246 | NEIGH_UPDATE_F_OVERRIDE| | |
1247 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
1248 | NEIGH_UPDATE_F_ISROUTER); | |
1249 | } | |
1250 | ||
70ceb4f5 | 1251 | #ifdef CONFIG_IPV6_ROUTE_INFO |
09c884d4 | 1252 | if (in6_dev->cnf.accept_ra_rtr_pref && ndopts.nd_opts_ri) { |
70ceb4f5 YH |
1253 | struct nd_opt_hdr *p; |
1254 | for (p = ndopts.nd_opts_ri; | |
1255 | p; | |
1256 | p = ndisc_next_option(p, ndopts.nd_opts_ri_end)) { | |
09c884d4 YH |
1257 | if (((struct route_info *)p)->prefix_len > in6_dev->cnf.accept_ra_rt_info_max_plen) |
1258 | continue; | |
70ceb4f5 | 1259 | rt6_route_rcv(skb->dev, (u8*)p, (p->nd_opt_len) << 3, |
0660e03f | 1260 | &ipv6_hdr(skb)->saddr); |
70ceb4f5 YH |
1261 | } |
1262 | } | |
1263 | #endif | |
1264 | ||
c4fd30eb | 1265 | if (in6_dev->cnf.accept_ra_pinfo && ndopts.nd_opts_pi) { |
1da177e4 LT |
1266 | struct nd_opt_hdr *p; |
1267 | for (p = ndopts.nd_opts_pi; | |
1268 | p; | |
1269 | p = ndisc_next_option(p, ndopts.nd_opts_pi_end)) { | |
1270 | addrconf_prefix_rcv(skb->dev, (u8*)p, (p->nd_opt_len) << 3); | |
1271 | } | |
1272 | } | |
1273 | ||
1274 | if (ndopts.nd_opts_mtu) { | |
e69a4adc | 1275 | __be32 n; |
1da177e4 LT |
1276 | u32 mtu; |
1277 | ||
e69a4adc AV |
1278 | memcpy(&n, ((u8*)(ndopts.nd_opts_mtu+1))+2, sizeof(mtu)); |
1279 | mtu = ntohl(n); | |
1da177e4 LT |
1280 | |
1281 | if (mtu < IPV6_MIN_MTU || mtu > skb->dev->mtu) { | |
1282 | ND_PRINTK2(KERN_WARNING | |
1283 | "ICMPv6 RA: invalid mtu: %d\n", | |
1284 | mtu); | |
1285 | } else if (in6_dev->cnf.mtu6 != mtu) { | |
1286 | in6_dev->cnf.mtu6 = mtu; | |
1287 | ||
1288 | if (rt) | |
1289 | rt->u.dst.metrics[RTAX_MTU-1] = mtu; | |
1290 | ||
1291 | rt6_mtu_change(skb->dev, mtu); | |
1292 | } | |
1293 | } | |
1ab1457c | 1294 | |
31910575 PY |
1295 | if (ndopts.nd_useropts) { |
1296 | struct nd_opt_hdr *opt; | |
1297 | for (opt = ndopts.nd_useropts; | |
1298 | opt; | |
1299 | opt = ndisc_next_useropt(opt, ndopts.nd_useropts_end)) { | |
1300 | ndisc_ra_useropt(skb, opt); | |
1301 | } | |
1302 | } | |
1303 | ||
1da177e4 LT |
1304 | if (ndopts.nd_opts_tgt_lladdr || ndopts.nd_opts_rh) { |
1305 | ND_PRINTK2(KERN_WARNING | |
1306 | "ICMPv6 RA: invalid RA options"); | |
1307 | } | |
1308 | out: | |
1309 | if (rt) | |
1310 | dst_release(&rt->u.dst); | |
1311 | else if (neigh) | |
1312 | neigh_release(neigh); | |
1313 | in6_dev_put(in6_dev); | |
1314 | } | |
1315 | ||
1316 | static void ndisc_redirect_rcv(struct sk_buff *skb) | |
1317 | { | |
1318 | struct inet6_dev *in6_dev; | |
1319 | struct icmp6hdr *icmph; | |
1320 | struct in6_addr *dest; | |
1321 | struct in6_addr *target; /* new first hop to destination */ | |
1322 | struct neighbour *neigh; | |
1323 | int on_link = 0; | |
1324 | struct ndisc_options ndopts; | |
1325 | int optlen; | |
1326 | u8 *lladdr = NULL; | |
1327 | ||
0660e03f | 1328 | if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) { |
1da177e4 LT |
1329 | ND_PRINTK2(KERN_WARNING |
1330 | "ICMPv6 Redirect: source address is not link-local.\n"); | |
1331 | return; | |
1332 | } | |
1333 | ||
27a884dc | 1334 | optlen = skb->tail - skb->transport_header; |
1da177e4 LT |
1335 | optlen -= sizeof(struct icmp6hdr) + 2 * sizeof(struct in6_addr); |
1336 | ||
1337 | if (optlen < 0) { | |
1338 | ND_PRINTK2(KERN_WARNING | |
1339 | "ICMPv6 Redirect: packet too short\n"); | |
1340 | return; | |
1341 | } | |
1342 | ||
cc70ab26 | 1343 | icmph = icmp6_hdr(skb); |
1da177e4 LT |
1344 | target = (struct in6_addr *) (icmph + 1); |
1345 | dest = target + 1; | |
1346 | ||
1347 | if (ipv6_addr_is_multicast(dest)) { | |
1348 | ND_PRINTK2(KERN_WARNING | |
1349 | "ICMPv6 Redirect: destination address is multicast.\n"); | |
1350 | return; | |
1351 | } | |
1352 | ||
1353 | if (ipv6_addr_equal(dest, target)) { | |
1354 | on_link = 1; | |
bf0b48df BH |
1355 | } else if (ipv6_addr_type(target) != |
1356 | (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) { | |
1ab1457c | 1357 | ND_PRINTK2(KERN_WARNING |
bf0b48df | 1358 | "ICMPv6 Redirect: target address is not link-local unicast.\n"); |
1da177e4 LT |
1359 | return; |
1360 | } | |
1361 | ||
1362 | in6_dev = in6_dev_get(skb->dev); | |
1363 | if (!in6_dev) | |
1364 | return; | |
1365 | if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects) { | |
1366 | in6_dev_put(in6_dev); | |
1367 | return; | |
1368 | } | |
1369 | ||
1ab1457c | 1370 | /* RFC2461 8.1: |
1da177e4 LT |
1371 | * The IP source address of the Redirect MUST be the same as the current |
1372 | * first-hop router for the specified ICMP Destination Address. | |
1373 | */ | |
1ab1457c | 1374 | |
1da177e4 LT |
1375 | if (!ndisc_parse_options((u8*)(dest + 1), optlen, &ndopts)) { |
1376 | ND_PRINTK2(KERN_WARNING | |
1377 | "ICMPv6 Redirect: invalid ND options\n"); | |
1378 | in6_dev_put(in6_dev); | |
1379 | return; | |
1380 | } | |
1381 | if (ndopts.nd_opts_tgt_lladdr) { | |
1382 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, | |
1383 | skb->dev); | |
1384 | if (!lladdr) { | |
1385 | ND_PRINTK2(KERN_WARNING | |
1386 | "ICMPv6 Redirect: invalid link-layer address length\n"); | |
1387 | in6_dev_put(in6_dev); | |
1388 | return; | |
1389 | } | |
1390 | } | |
1391 | ||
1392 | neigh = __neigh_lookup(&nd_tbl, target, skb->dev, 1); | |
1393 | if (neigh) { | |
0660e03f ACM |
1394 | rt6_redirect(dest, &ipv6_hdr(skb)->daddr, |
1395 | &ipv6_hdr(skb)->saddr, neigh, lladdr, | |
1da177e4 LT |
1396 | on_link); |
1397 | neigh_release(neigh); | |
1398 | } | |
1399 | in6_dev_put(in6_dev); | |
1400 | } | |
1401 | ||
1402 | void ndisc_send_redirect(struct sk_buff *skb, struct neighbour *neigh, | |
1403 | struct in6_addr *target) | |
1404 | { | |
1405 | struct sock *sk = ndisc_socket->sk; | |
1406 | int len = sizeof(struct icmp6hdr) + 2 * sizeof(struct in6_addr); | |
1407 | struct sk_buff *buff; | |
1408 | struct icmp6hdr *icmph; | |
1409 | struct in6_addr saddr_buf; | |
1410 | struct in6_addr *addrp; | |
1411 | struct net_device *dev; | |
1412 | struct rt6_info *rt; | |
1413 | struct dst_entry *dst; | |
1414 | struct inet6_dev *idev; | |
1415 | struct flowi fl; | |
1416 | u8 *opt; | |
1417 | int rd_len; | |
1418 | int err; | |
1419 | int hlen; | |
1420 | u8 ha_buf[MAX_ADDR_LEN], *ha = NULL; | |
1421 | ||
1422 | dev = skb->dev; | |
1423 | ||
95c385b4 | 1424 | if (ipv6_get_lladdr(dev, &saddr_buf, IFA_F_TENTATIVE)) { |
1da177e4 LT |
1425 | ND_PRINTK2(KERN_WARNING |
1426 | "ICMPv6 Redirect: no link-local address on %s\n", | |
1427 | dev->name); | |
1ab1457c YH |
1428 | return; |
1429 | } | |
1da177e4 | 1430 | |
0660e03f | 1431 | if (!ipv6_addr_equal(&ipv6_hdr(skb)->daddr, target) && |
bf0b48df | 1432 | ipv6_addr_type(target) != (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) { |
29556526 | 1433 | ND_PRINTK2(KERN_WARNING |
bf0b48df | 1434 | "ICMPv6 Redirect: target address is not link-local unicast.\n"); |
29556526 LY |
1435 | return; |
1436 | } | |
1437 | ||
0660e03f | 1438 | ndisc_flow_init(&fl, NDISC_REDIRECT, &saddr_buf, &ipv6_hdr(skb)->saddr, |
af184765 | 1439 | dev->ifindex); |
1da177e4 LT |
1440 | |
1441 | dst = ip6_route_output(NULL, &fl); | |
1442 | if (dst == NULL) | |
1443 | return; | |
1444 | ||
1445 | err = xfrm_lookup(&dst, &fl, NULL, 0); | |
e104411b | 1446 | if (err) |
1da177e4 | 1447 | return; |
1da177e4 LT |
1448 | |
1449 | rt = (struct rt6_info *) dst; | |
1450 | ||
1451 | if (rt->rt6i_flags & RTF_GATEWAY) { | |
1452 | ND_PRINTK2(KERN_WARNING | |
1453 | "ICMPv6 Redirect: destination is not a neighbour.\n"); | |
1454 | dst_release(dst); | |
1455 | return; | |
1456 | } | |
1457 | if (!xrlim_allow(dst, 1*HZ)) { | |
1458 | dst_release(dst); | |
1459 | return; | |
1460 | } | |
1461 | ||
1462 | if (dev->addr_len) { | |
1463 | read_lock_bh(&neigh->lock); | |
1464 | if (neigh->nud_state & NUD_VALID) { | |
1465 | memcpy(ha_buf, neigh->ha, dev->addr_len); | |
1466 | read_unlock_bh(&neigh->lock); | |
1467 | ha = ha_buf; | |
1468 | len += ndisc_opt_addr_space(dev); | |
1469 | } else | |
1470 | read_unlock_bh(&neigh->lock); | |
1471 | } | |
1472 | ||
1473 | rd_len = min_t(unsigned int, | |
1474 | IPV6_MIN_MTU-sizeof(struct ipv6hdr)-len, skb->len + 8); | |
1475 | rd_len &= ~0x7; | |
1476 | len += rd_len; | |
1477 | ||
d54a81d3 DM |
1478 | buff = sock_alloc_send_skb(sk, |
1479 | (MAX_HEADER + sizeof(struct ipv6hdr) + | |
1480 | len + LL_RESERVED_SPACE(dev)), | |
1da177e4 LT |
1481 | 1, &err); |
1482 | if (buff == NULL) { | |
1483 | ND_PRINTK0(KERN_ERR | |
1484 | "ICMPv6 Redirect: %s() failed to allocate an skb.\n", | |
1485 | __FUNCTION__); | |
1486 | dst_release(dst); | |
1487 | return; | |
1488 | } | |
1489 | ||
1490 | hlen = 0; | |
1491 | ||
1492 | skb_reserve(buff, LL_RESERVED_SPACE(dev)); | |
0660e03f | 1493 | ip6_nd_hdr(sk, buff, dev, &saddr_buf, &ipv6_hdr(skb)->saddr, |
1da177e4 LT |
1494 | IPPROTO_ICMPV6, len); |
1495 | ||
27a884dc | 1496 | skb_set_transport_header(buff, skb_tail_pointer(buff) - buff->data); |
d10ba34b ACM |
1497 | skb_put(buff, len); |
1498 | icmph = icmp6_hdr(buff); | |
1da177e4 LT |
1499 | |
1500 | memset(icmph, 0, sizeof(struct icmp6hdr)); | |
1501 | icmph->icmp6_type = NDISC_REDIRECT; | |
1502 | ||
1503 | /* | |
1504 | * copy target and destination addresses | |
1505 | */ | |
1506 | ||
1507 | addrp = (struct in6_addr *)(icmph + 1); | |
1508 | ipv6_addr_copy(addrp, target); | |
1509 | addrp++; | |
0660e03f | 1510 | ipv6_addr_copy(addrp, &ipv6_hdr(skb)->daddr); |
1da177e4 LT |
1511 | |
1512 | opt = (u8*) (addrp + 1); | |
1513 | ||
1514 | /* | |
1515 | * include target_address option | |
1516 | */ | |
1517 | ||
1518 | if (ha) | |
1519 | opt = ndisc_fill_addr_option(opt, ND_OPT_TARGET_LL_ADDR, ha, | |
1520 | dev->addr_len, dev->type); | |
1521 | ||
1522 | /* | |
1523 | * build redirect option and copy skb over to the new packet. | |
1524 | */ | |
1525 | ||
1ab1457c | 1526 | memset(opt, 0, 8); |
1da177e4 LT |
1527 | *(opt++) = ND_OPT_REDIRECT_HDR; |
1528 | *(opt++) = (rd_len >> 3); | |
1529 | opt += 6; | |
1530 | ||
0660e03f | 1531 | memcpy(opt, ipv6_hdr(skb), rd_len - 8); |
1da177e4 | 1532 | |
0660e03f | 1533 | icmph->icmp6_cksum = csum_ipv6_magic(&saddr_buf, &ipv6_hdr(skb)->saddr, |
1da177e4 LT |
1534 | len, IPPROTO_ICMPV6, |
1535 | csum_partial((u8 *) icmph, len, 0)); | |
1536 | ||
1537 | buff->dst = dst; | |
1538 | idev = in6_dev_get(dst->dev); | |
a11d206d | 1539 | IP6_INC_STATS(idev, IPSTATS_MIB_OUTREQUESTS); |
1da177e4 LT |
1540 | err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, buff, NULL, dst->dev, dst_output); |
1541 | if (!err) { | |
14878f75 | 1542 | ICMP6MSGOUT_INC_STATS(idev, NDISC_REDIRECT); |
1da177e4 LT |
1543 | ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS); |
1544 | } | |
1545 | ||
1546 | if (likely(idev != NULL)) | |
1547 | in6_dev_put(idev); | |
1548 | } | |
1549 | ||
1550 | static void pndisc_redo(struct sk_buff *skb) | |
1551 | { | |
140e26fc | 1552 | ndisc_recv_ns(skb); |
1da177e4 LT |
1553 | kfree_skb(skb); |
1554 | } | |
1555 | ||
1556 | int ndisc_rcv(struct sk_buff *skb) | |
1557 | { | |
1558 | struct nd_msg *msg; | |
1559 | ||
1560 | if (!pskb_may_pull(skb, skb->len)) | |
1561 | return 0; | |
1562 | ||
9c70220b | 1563 | msg = (struct nd_msg *)skb_transport_header(skb); |
1da177e4 | 1564 | |
9c70220b | 1565 | __skb_push(skb, skb->data - skb_transport_header(skb)); |
1da177e4 | 1566 | |
0660e03f | 1567 | if (ipv6_hdr(skb)->hop_limit != 255) { |
1da177e4 LT |
1568 | ND_PRINTK2(KERN_WARNING |
1569 | "ICMPv6 NDISC: invalid hop-limit: %d\n", | |
0660e03f | 1570 | ipv6_hdr(skb)->hop_limit); |
1da177e4 LT |
1571 | return 0; |
1572 | } | |
1573 | ||
1574 | if (msg->icmph.icmp6_code != 0) { | |
1ab1457c | 1575 | ND_PRINTK2(KERN_WARNING |
1da177e4 LT |
1576 | "ICMPv6 NDISC: invalid ICMPv6 code: %d\n", |
1577 | msg->icmph.icmp6_code); | |
1578 | return 0; | |
1579 | } | |
1580 | ||
a61bbcf2 PM |
1581 | memset(NEIGH_CB(skb), 0, sizeof(struct neighbour_cb)); |
1582 | ||
1da177e4 LT |
1583 | switch (msg->icmph.icmp6_type) { |
1584 | case NDISC_NEIGHBOUR_SOLICITATION: | |
1585 | ndisc_recv_ns(skb); | |
1586 | break; | |
1587 | ||
1588 | case NDISC_NEIGHBOUR_ADVERTISEMENT: | |
1589 | ndisc_recv_na(skb); | |
1590 | break; | |
1591 | ||
1592 | case NDISC_ROUTER_SOLICITATION: | |
1593 | ndisc_recv_rs(skb); | |
1594 | break; | |
1595 | ||
1596 | case NDISC_ROUTER_ADVERTISEMENT: | |
1597 | ndisc_router_discovery(skb); | |
1598 | break; | |
1599 | ||
1600 | case NDISC_REDIRECT: | |
1601 | ndisc_redirect_rcv(skb); | |
1602 | break; | |
3ff50b79 | 1603 | } |
1da177e4 LT |
1604 | |
1605 | return 0; | |
1606 | } | |
1607 | ||
1608 | static int ndisc_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1609 | { | |
1610 | struct net_device *dev = ptr; | |
1611 | ||
e9dc8653 EB |
1612 | if (dev->nd_net != &init_net) |
1613 | return NOTIFY_DONE; | |
1614 | ||
1da177e4 LT |
1615 | switch (event) { |
1616 | case NETDEV_CHANGEADDR: | |
1617 | neigh_changeaddr(&nd_tbl, dev); | |
1618 | fib6_run_gc(~0UL); | |
1619 | break; | |
1620 | case NETDEV_DOWN: | |
1621 | neigh_ifdown(&nd_tbl, dev); | |
1622 | fib6_run_gc(~0UL); | |
1623 | break; | |
1624 | default: | |
1625 | break; | |
1626 | } | |
1627 | ||
1628 | return NOTIFY_DONE; | |
1629 | } | |
1630 | ||
1631 | static struct notifier_block ndisc_netdev_notifier = { | |
1632 | .notifier_call = ndisc_netdev_event, | |
1633 | }; | |
1634 | ||
1635 | #ifdef CONFIG_SYSCTL | |
1636 | static void ndisc_warn_deprecated_sysctl(struct ctl_table *ctl, | |
1637 | const char *func, const char *dev_name) | |
1638 | { | |
1639 | static char warncomm[TASK_COMM_LEN]; | |
1640 | static int warned; | |
1641 | if (strcmp(warncomm, current->comm) && warned < 5) { | |
1642 | strcpy(warncomm, current->comm); | |
1643 | printk(KERN_WARNING | |
1644 | "process `%s' is using deprecated sysctl (%s) " | |
1645 | "net.ipv6.neigh.%s.%s; " | |
1646 | "Use net.ipv6.neigh.%s.%s_ms " | |
1647 | "instead.\n", | |
1648 | warncomm, func, | |
1649 | dev_name, ctl->procname, | |
1650 | dev_name, ctl->procname); | |
1651 | warned++; | |
1652 | } | |
1653 | } | |
1654 | ||
1655 | int ndisc_ifinfo_sysctl_change(struct ctl_table *ctl, int write, struct file * filp, void __user *buffer, size_t *lenp, loff_t *ppos) | |
1656 | { | |
1657 | struct net_device *dev = ctl->extra1; | |
1658 | struct inet6_dev *idev; | |
1659 | int ret; | |
1660 | ||
d12af679 EB |
1661 | if ((strcmp(ctl->procname, "retrans_time") == 0) || |
1662 | (strcmp(ctl->procname, "base_reachable_time") == 0)) | |
1da177e4 LT |
1663 | ndisc_warn_deprecated_sysctl(ctl, "syscall", dev ? dev->name : "default"); |
1664 | ||
d12af679 | 1665 | if (strcmp(ctl->procname, "retrans_time") == 0) |
1da177e4 | 1666 | ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos); |
d12af679 EB |
1667 | |
1668 | else if (strcmp(ctl->procname, "base_reachable_time") == 0) | |
1da177e4 LT |
1669 | ret = proc_dointvec_jiffies(ctl, write, |
1670 | filp, buffer, lenp, ppos); | |
d12af679 EB |
1671 | |
1672 | else if ((strcmp(ctl->procname, "retrans_time_ms") == 0) || | |
1673 | (strcmp(ctl->procname, "base_reacable_time_ms") == 0)) | |
1da177e4 LT |
1674 | ret = proc_dointvec_ms_jiffies(ctl, write, |
1675 | filp, buffer, lenp, ppos); | |
d12af679 | 1676 | else |
1da177e4 | 1677 | ret = -1; |
1da177e4 LT |
1678 | |
1679 | if (write && ret == 0 && dev && (idev = in6_dev_get(dev)) != NULL) { | |
d12af679 | 1680 | if (ctl->data == &idev->nd_parms->base_reachable_time) |
1da177e4 LT |
1681 | idev->nd_parms->reachable_time = neigh_rand_reach_time(idev->nd_parms->base_reachable_time); |
1682 | idev->tstamp = jiffies; | |
1683 | inet6_ifinfo_notify(RTM_NEWLINK, idev); | |
1684 | in6_dev_put(idev); | |
1685 | } | |
1686 | return ret; | |
1687 | } | |
1688 | ||
1689 | static int ndisc_ifinfo_sysctl_strategy(ctl_table *ctl, int __user *name, | |
1690 | int nlen, void __user *oldval, | |
1691 | size_t __user *oldlenp, | |
1f29bcd7 | 1692 | void __user *newval, size_t newlen) |
1da177e4 LT |
1693 | { |
1694 | struct net_device *dev = ctl->extra1; | |
1695 | struct inet6_dev *idev; | |
1696 | int ret; | |
1697 | ||
1698 | if (ctl->ctl_name == NET_NEIGH_RETRANS_TIME || | |
1699 | ctl->ctl_name == NET_NEIGH_REACHABLE_TIME) | |
1700 | ndisc_warn_deprecated_sysctl(ctl, "procfs", dev ? dev->name : "default"); | |
1701 | ||
1702 | switch (ctl->ctl_name) { | |
1703 | case NET_NEIGH_REACHABLE_TIME: | |
1704 | ret = sysctl_jiffies(ctl, name, nlen, | |
1f29bcd7 | 1705 | oldval, oldlenp, newval, newlen); |
1da177e4 LT |
1706 | break; |
1707 | case NET_NEIGH_RETRANS_TIME_MS: | |
1708 | case NET_NEIGH_REACHABLE_TIME_MS: | |
1709 | ret = sysctl_ms_jiffies(ctl, name, nlen, | |
1f29bcd7 | 1710 | oldval, oldlenp, newval, newlen); |
1da177e4 LT |
1711 | break; |
1712 | default: | |
1713 | ret = 0; | |
1714 | } | |
1715 | ||
1716 | if (newval && newlen && ret > 0 && | |
1717 | dev && (idev = in6_dev_get(dev)) != NULL) { | |
1718 | if (ctl->ctl_name == NET_NEIGH_REACHABLE_TIME || | |
1719 | ctl->ctl_name == NET_NEIGH_REACHABLE_TIME_MS) | |
1720 | idev->nd_parms->reachable_time = neigh_rand_reach_time(idev->nd_parms->base_reachable_time); | |
1721 | idev->tstamp = jiffies; | |
1722 | inet6_ifinfo_notify(RTM_NEWLINK, idev); | |
1723 | in6_dev_put(idev); | |
1724 | } | |
1725 | ||
1726 | return ret; | |
1727 | } | |
1728 | ||
1729 | #endif | |
1730 | ||
1731 | int __init ndisc_init(struct net_proto_family *ops) | |
1732 | { | |
1733 | struct ipv6_pinfo *np; | |
1734 | struct sock *sk; | |
1ab1457c | 1735 | int err; |
1da177e4 LT |
1736 | |
1737 | err = sock_create_kern(PF_INET6, SOCK_RAW, IPPROTO_ICMPV6, &ndisc_socket); | |
1738 | if (err < 0) { | |
1739 | ND_PRINTK0(KERN_ERR | |
1ab1457c | 1740 | "ICMPv6 NDISC: Failed to initialize the control socket (err %d).\n", |
1da177e4 LT |
1741 | err); |
1742 | ndisc_socket = NULL; /* For safety. */ | |
1743 | return err; | |
1744 | } | |
1745 | ||
1746 | sk = ndisc_socket->sk; | |
1747 | np = inet6_sk(sk); | |
1748 | sk->sk_allocation = GFP_ATOMIC; | |
1749 | np->hop_limit = 255; | |
1750 | /* Do not loopback ndisc messages */ | |
1751 | np->mc_loop = 0; | |
1752 | sk->sk_prot->unhash(sk); | |
1753 | ||
1ab1457c YH |
1754 | /* |
1755 | * Initialize the neighbour table | |
1756 | */ | |
1757 | ||
1da177e4 LT |
1758 | neigh_table_init(&nd_tbl); |
1759 | ||
1760 | #ifdef CONFIG_SYSCTL | |
1ab1457c | 1761 | neigh_sysctl_register(NULL, &nd_tbl.parms, NET_IPV6, NET_IPV6_NEIGH, |
1da177e4 LT |
1762 | "ipv6", |
1763 | &ndisc_ifinfo_sysctl_change, | |
1764 | &ndisc_ifinfo_sysctl_strategy); | |
1765 | #endif | |
1766 | ||
1767 | register_netdevice_notifier(&ndisc_netdev_notifier); | |
1768 | return 0; | |
1769 | } | |
1770 | ||
1771 | void ndisc_cleanup(void) | |
1772 | { | |
36f73d0c | 1773 | unregister_netdevice_notifier(&ndisc_netdev_notifier); |
1da177e4 LT |
1774 | #ifdef CONFIG_SYSCTL |
1775 | neigh_sysctl_unregister(&nd_tbl.parms); | |
1776 | #endif | |
1777 | neigh_table_clear(&nd_tbl); | |
1778 | sock_release(ndisc_socket); | |
1779 | ndisc_socket = NULL; /* For safety. */ | |
1780 | } |