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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Neighbour Discovery for IPv6 | |
1ab1457c | 3 | * Linux INET6 implementation |
1da177e4 LT |
4 | * |
5 | * Authors: | |
1ab1457c | 6 | * Pedro Roque <roque@di.fc.ul.pt> |
1da177e4 LT |
7 | * Mike Shaver <shaver@ingenia.com> |
8 | * | |
9 | * This program is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU General Public License | |
11 | * as published by the Free Software Foundation; either version | |
12 | * 2 of the License, or (at your option) any later version. | |
13 | */ | |
14 | ||
15 | /* | |
16 | * Changes: | |
17 | * | |
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> | |
1ed8516f | 87 | #include <net/inet_common.h> |
1da177e4 LT |
88 | #include <linux/proc_fs.h> |
89 | ||
90 | #include <linux/netfilter.h> | |
91 | #include <linux/netfilter_ipv6.h> | |
92 | ||
1da177e4 LT |
93 | static u32 ndisc_hash(const void *pkey, const struct net_device *dev); |
94 | static int ndisc_constructor(struct neighbour *neigh); | |
95 | static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb); | |
96 | static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb); | |
97 | static int pndisc_constructor(struct pneigh_entry *n); | |
98 | static void pndisc_destructor(struct pneigh_entry *n); | |
99 | static void pndisc_redo(struct sk_buff *skb); | |
100 | ||
101 | static struct neigh_ops ndisc_generic_ops = { | |
102 | .family = AF_INET6, | |
103 | .solicit = ndisc_solicit, | |
104 | .error_report = ndisc_error_report, | |
105 | .output = neigh_resolve_output, | |
106 | .connected_output = neigh_connected_output, | |
107 | .hh_output = dev_queue_xmit, | |
108 | .queue_xmit = dev_queue_xmit, | |
109 | }; | |
110 | ||
111 | static struct neigh_ops ndisc_hh_ops = { | |
112 | .family = AF_INET6, | |
113 | .solicit = ndisc_solicit, | |
114 | .error_report = ndisc_error_report, | |
115 | .output = neigh_resolve_output, | |
116 | .connected_output = neigh_resolve_output, | |
117 | .hh_output = dev_queue_xmit, | |
118 | .queue_xmit = dev_queue_xmit, | |
119 | }; | |
120 | ||
121 | ||
122 | static struct neigh_ops ndisc_direct_ops = { | |
123 | .family = AF_INET6, | |
124 | .output = dev_queue_xmit, | |
125 | .connected_output = dev_queue_xmit, | |
126 | .hh_output = dev_queue_xmit, | |
127 | .queue_xmit = dev_queue_xmit, | |
128 | }; | |
129 | ||
130 | struct neigh_table nd_tbl = { | |
131 | .family = AF_INET6, | |
132 | .entry_size = sizeof(struct neighbour) + sizeof(struct in6_addr), | |
133 | .key_len = sizeof(struct in6_addr), | |
134 | .hash = ndisc_hash, | |
135 | .constructor = ndisc_constructor, | |
136 | .pconstructor = pndisc_constructor, | |
137 | .pdestructor = pndisc_destructor, | |
138 | .proxy_redo = pndisc_redo, | |
139 | .id = "ndisc_cache", | |
140 | .parms = { | |
141 | .tbl = &nd_tbl, | |
142 | .base_reachable_time = 30 * HZ, | |
143 | .retrans_time = 1 * HZ, | |
144 | .gc_staletime = 60 * HZ, | |
145 | .reachable_time = 30 * HZ, | |
146 | .delay_probe_time = 5 * HZ, | |
147 | .queue_len = 3, | |
148 | .ucast_probes = 3, | |
149 | .mcast_probes = 3, | |
150 | .anycast_delay = 1 * HZ, | |
151 | .proxy_delay = (8 * HZ) / 10, | |
152 | .proxy_qlen = 64, | |
153 | }, | |
154 | .gc_interval = 30 * HZ, | |
155 | .gc_thresh1 = 128, | |
156 | .gc_thresh2 = 512, | |
157 | .gc_thresh3 = 1024, | |
158 | }; | |
159 | ||
160 | /* ND options */ | |
161 | struct ndisc_options { | |
70ceb4f5 YH |
162 | struct nd_opt_hdr *nd_opt_array[__ND_OPT_ARRAY_MAX]; |
163 | #ifdef CONFIG_IPV6_ROUTE_INFO | |
164 | struct nd_opt_hdr *nd_opts_ri; | |
165 | struct nd_opt_hdr *nd_opts_ri_end; | |
166 | #endif | |
31910575 PY |
167 | struct nd_opt_hdr *nd_useropts; |
168 | struct nd_opt_hdr *nd_useropts_end; | |
1da177e4 LT |
169 | }; |
170 | ||
171 | #define nd_opts_src_lladdr nd_opt_array[ND_OPT_SOURCE_LL_ADDR] | |
172 | #define nd_opts_tgt_lladdr nd_opt_array[ND_OPT_TARGET_LL_ADDR] | |
173 | #define nd_opts_pi nd_opt_array[ND_OPT_PREFIX_INFO] | |
174 | #define nd_opts_pi_end nd_opt_array[__ND_OPT_PREFIX_INFO_END] | |
175 | #define nd_opts_rh nd_opt_array[ND_OPT_REDIRECT_HDR] | |
176 | #define nd_opts_mtu nd_opt_array[ND_OPT_MTU] | |
177 | ||
178 | #define NDISC_OPT_SPACE(len) (((len)+2+7)&~7) | |
179 | ||
180 | /* | |
181 | * Return the padding between the option length and the start of the | |
182 | * link addr. Currently only IP-over-InfiniBand needs this, although | |
183 | * if RFC 3831 IPv6-over-Fibre Channel is ever implemented it may | |
184 | * also need a pad of 2. | |
185 | */ | |
186 | static int ndisc_addr_option_pad(unsigned short type) | |
187 | { | |
188 | switch (type) { | |
189 | case ARPHRD_INFINIBAND: return 2; | |
190 | default: return 0; | |
191 | } | |
192 | } | |
193 | ||
194 | static inline int ndisc_opt_addr_space(struct net_device *dev) | |
195 | { | |
196 | return NDISC_OPT_SPACE(dev->addr_len + ndisc_addr_option_pad(dev->type)); | |
197 | } | |
198 | ||
199 | static u8 *ndisc_fill_addr_option(u8 *opt, int type, void *data, int data_len, | |
200 | unsigned short addr_type) | |
201 | { | |
202 | int space = NDISC_OPT_SPACE(data_len); | |
203 | int pad = ndisc_addr_option_pad(addr_type); | |
204 | ||
205 | opt[0] = type; | |
206 | opt[1] = space>>3; | |
207 | ||
208 | memset(opt + 2, 0, pad); | |
209 | opt += pad; | |
210 | space -= pad; | |
211 | ||
212 | memcpy(opt+2, data, data_len); | |
213 | data_len += 2; | |
214 | opt += data_len; | |
215 | if ((space -= data_len) > 0) | |
216 | memset(opt, 0, space); | |
217 | return opt + space; | |
218 | } | |
219 | ||
220 | static struct nd_opt_hdr *ndisc_next_option(struct nd_opt_hdr *cur, | |
221 | struct nd_opt_hdr *end) | |
222 | { | |
223 | int type; | |
224 | if (!cur || !end || cur >= end) | |
225 | return NULL; | |
226 | type = cur->nd_opt_type; | |
227 | do { | |
228 | cur = ((void *)cur) + (cur->nd_opt_len << 3); | |
229 | } while(cur < end && cur->nd_opt_type != type); | |
230 | return (cur <= end && cur->nd_opt_type == type ? cur : NULL); | |
231 | } | |
232 | ||
31910575 PY |
233 | static inline int ndisc_is_useropt(struct nd_opt_hdr *opt) |
234 | { | |
235 | return (opt->nd_opt_type == ND_OPT_RDNSS); | |
236 | } | |
237 | ||
238 | static struct nd_opt_hdr *ndisc_next_useropt(struct nd_opt_hdr *cur, | |
239 | struct nd_opt_hdr *end) | |
240 | { | |
241 | if (!cur || !end || cur >= end) | |
242 | return NULL; | |
243 | do { | |
244 | cur = ((void *)cur) + (cur->nd_opt_len << 3); | |
245 | } while(cur < end && !ndisc_is_useropt(cur)); | |
246 | return (cur <= end && ndisc_is_useropt(cur) ? cur : NULL); | |
247 | } | |
248 | ||
1da177e4 LT |
249 | static struct ndisc_options *ndisc_parse_options(u8 *opt, int opt_len, |
250 | struct ndisc_options *ndopts) | |
251 | { | |
252 | struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)opt; | |
253 | ||
254 | if (!nd_opt || opt_len < 0 || !ndopts) | |
255 | return NULL; | |
256 | memset(ndopts, 0, sizeof(*ndopts)); | |
257 | while (opt_len) { | |
258 | int l; | |
259 | if (opt_len < sizeof(struct nd_opt_hdr)) | |
260 | return NULL; | |
261 | l = nd_opt->nd_opt_len << 3; | |
262 | if (opt_len < l || l == 0) | |
263 | return NULL; | |
264 | switch (nd_opt->nd_opt_type) { | |
265 | case ND_OPT_SOURCE_LL_ADDR: | |
266 | case ND_OPT_TARGET_LL_ADDR: | |
267 | case ND_OPT_MTU: | |
268 | case ND_OPT_REDIRECT_HDR: | |
269 | if (ndopts->nd_opt_array[nd_opt->nd_opt_type]) { | |
270 | ND_PRINTK2(KERN_WARNING | |
271 | "%s(): duplicated ND6 option found: type=%d\n", | |
0dc47877 | 272 | __func__, |
1da177e4 LT |
273 | nd_opt->nd_opt_type); |
274 | } else { | |
275 | ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt; | |
276 | } | |
277 | break; | |
278 | case ND_OPT_PREFIX_INFO: | |
279 | ndopts->nd_opts_pi_end = nd_opt; | |
cfcabdcc | 280 | if (!ndopts->nd_opt_array[nd_opt->nd_opt_type]) |
1da177e4 LT |
281 | ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt; |
282 | break; | |
70ceb4f5 YH |
283 | #ifdef CONFIG_IPV6_ROUTE_INFO |
284 | case ND_OPT_ROUTE_INFO: | |
285 | ndopts->nd_opts_ri_end = nd_opt; | |
286 | if (!ndopts->nd_opts_ri) | |
287 | ndopts->nd_opts_ri = nd_opt; | |
288 | break; | |
289 | #endif | |
1da177e4 | 290 | default: |
31910575 PY |
291 | if (ndisc_is_useropt(nd_opt)) { |
292 | ndopts->nd_useropts_end = nd_opt; | |
293 | if (!ndopts->nd_useropts) | |
294 | ndopts->nd_useropts = nd_opt; | |
295 | } else { | |
296 | /* | |
297 | * Unknown options must be silently ignored, | |
298 | * to accommodate future extension to the | |
299 | * protocol. | |
300 | */ | |
301 | ND_PRINTK2(KERN_NOTICE | |
302 | "%s(): ignored unsupported option; type=%d, len=%d\n", | |
0dc47877 | 303 | __func__, |
31910575 PY |
304 | nd_opt->nd_opt_type, nd_opt->nd_opt_len); |
305 | } | |
1da177e4 LT |
306 | } |
307 | opt_len -= l; | |
308 | nd_opt = ((void *)nd_opt) + l; | |
309 | } | |
310 | return ndopts; | |
311 | } | |
312 | ||
313 | static inline u8 *ndisc_opt_addr_data(struct nd_opt_hdr *p, | |
314 | struct net_device *dev) | |
315 | { | |
316 | u8 *lladdr = (u8 *)(p + 1); | |
317 | int lladdrlen = p->nd_opt_len << 3; | |
318 | int prepad = ndisc_addr_option_pad(dev->type); | |
319 | if (lladdrlen != NDISC_OPT_SPACE(dev->addr_len + prepad)) | |
320 | return NULL; | |
321 | return (lladdr + prepad); | |
322 | } | |
323 | ||
324 | int ndisc_mc_map(struct in6_addr *addr, char *buf, struct net_device *dev, int dir) | |
325 | { | |
326 | switch (dev->type) { | |
327 | case ARPHRD_ETHER: | |
328 | case ARPHRD_IEEE802: /* Not sure. Check it later. --ANK */ | |
329 | case ARPHRD_FDDI: | |
330 | ipv6_eth_mc_map(addr, buf); | |
331 | return 0; | |
332 | case ARPHRD_IEEE802_TR: | |
333 | ipv6_tr_mc_map(addr,buf); | |
334 | return 0; | |
335 | case ARPHRD_ARCNET: | |
336 | ipv6_arcnet_mc_map(addr, buf); | |
337 | return 0; | |
338 | case ARPHRD_INFINIBAND: | |
a9e527e3 | 339 | ipv6_ib_mc_map(addr, dev->broadcast, buf); |
1da177e4 LT |
340 | return 0; |
341 | default: | |
342 | if (dir) { | |
343 | memcpy(buf, dev->broadcast, dev->addr_len); | |
344 | return 0; | |
345 | } | |
346 | } | |
347 | return -EINVAL; | |
348 | } | |
349 | ||
7159039a YH |
350 | EXPORT_SYMBOL(ndisc_mc_map); |
351 | ||
1da177e4 LT |
352 | static u32 ndisc_hash(const void *pkey, const struct net_device *dev) |
353 | { | |
354 | const u32 *p32 = pkey; | |
355 | u32 addr_hash, i; | |
356 | ||
357 | addr_hash = 0; | |
358 | for (i = 0; i < (sizeof(struct in6_addr) / sizeof(u32)); i++) | |
359 | addr_hash ^= *p32++; | |
360 | ||
361 | return jhash_2words(addr_hash, dev->ifindex, nd_tbl.hash_rnd); | |
362 | } | |
363 | ||
364 | static int ndisc_constructor(struct neighbour *neigh) | |
365 | { | |
366 | struct in6_addr *addr = (struct in6_addr*)&neigh->primary_key; | |
367 | struct net_device *dev = neigh->dev; | |
368 | struct inet6_dev *in6_dev; | |
369 | struct neigh_parms *parms; | |
370 | int is_multicast = ipv6_addr_is_multicast(addr); | |
371 | ||
372 | rcu_read_lock(); | |
373 | in6_dev = in6_dev_get(dev); | |
374 | if (in6_dev == NULL) { | |
375 | rcu_read_unlock(); | |
376 | return -EINVAL; | |
377 | } | |
378 | ||
379 | parms = in6_dev->nd_parms; | |
380 | __neigh_parms_put(neigh->parms); | |
381 | neigh->parms = neigh_parms_clone(parms); | |
382 | rcu_read_unlock(); | |
383 | ||
384 | neigh->type = is_multicast ? RTN_MULTICAST : RTN_UNICAST; | |
3b04ddde | 385 | if (!dev->header_ops) { |
1da177e4 LT |
386 | neigh->nud_state = NUD_NOARP; |
387 | neigh->ops = &ndisc_direct_ops; | |
388 | neigh->output = neigh->ops->queue_xmit; | |
389 | } else { | |
390 | if (is_multicast) { | |
391 | neigh->nud_state = NUD_NOARP; | |
392 | ndisc_mc_map(addr, neigh->ha, dev, 1); | |
393 | } else if (dev->flags&(IFF_NOARP|IFF_LOOPBACK)) { | |
394 | neigh->nud_state = NUD_NOARP; | |
395 | memcpy(neigh->ha, dev->dev_addr, dev->addr_len); | |
396 | if (dev->flags&IFF_LOOPBACK) | |
397 | neigh->type = RTN_LOCAL; | |
398 | } else if (dev->flags&IFF_POINTOPOINT) { | |
399 | neigh->nud_state = NUD_NOARP; | |
400 | memcpy(neigh->ha, dev->broadcast, dev->addr_len); | |
401 | } | |
3b04ddde | 402 | if (dev->header_ops->cache) |
1da177e4 LT |
403 | neigh->ops = &ndisc_hh_ops; |
404 | else | |
405 | neigh->ops = &ndisc_generic_ops; | |
406 | if (neigh->nud_state&NUD_VALID) | |
407 | neigh->output = neigh->ops->connected_output; | |
408 | else | |
409 | neigh->output = neigh->ops->output; | |
410 | } | |
411 | in6_dev_put(in6_dev); | |
412 | return 0; | |
413 | } | |
414 | ||
415 | static int pndisc_constructor(struct pneigh_entry *n) | |
416 | { | |
417 | struct in6_addr *addr = (struct in6_addr*)&n->key; | |
418 | struct in6_addr maddr; | |
419 | struct net_device *dev = n->dev; | |
420 | ||
421 | if (dev == NULL || __in6_dev_get(dev) == NULL) | |
422 | return -EINVAL; | |
423 | addrconf_addr_solict_mult(addr, &maddr); | |
424 | ipv6_dev_mc_inc(dev, &maddr); | |
425 | return 0; | |
426 | } | |
427 | ||
428 | static void pndisc_destructor(struct pneigh_entry *n) | |
429 | { | |
430 | struct in6_addr *addr = (struct in6_addr*)&n->key; | |
431 | struct in6_addr maddr; | |
432 | struct net_device *dev = n->dev; | |
433 | ||
434 | if (dev == NULL || __in6_dev_get(dev) == NULL) | |
435 | return; | |
436 | addrconf_addr_solict_mult(addr, &maddr); | |
437 | ipv6_dev_mc_dec(dev, &maddr); | |
438 | } | |
439 | ||
305d552a BH |
440 | struct sk_buff *ndisc_build_skb(struct net_device *dev, |
441 | const struct in6_addr *daddr, | |
442 | const struct in6_addr *saddr, | |
443 | struct icmp6hdr *icmp6h, | |
444 | const struct in6_addr *target, | |
445 | int llinfo) | |
1da177e4 | 446 | { |
c346dca1 | 447 | struct net *net = dev_net(dev); |
1762f7e8 | 448 | struct sock *sk = net->ipv6.ndisc_sk; |
1ab1457c | 449 | struct sk_buff *skb; |
e1ec7842 | 450 | struct icmp6hdr *hdr; |
e1ec7842 | 451 | int len; |
1da177e4 | 452 | int err; |
305d552a | 453 | u8 *opt; |
1da177e4 | 454 | |
e1ec7842 YH |
455 | if (!dev->addr_len) |
456 | llinfo = 0; | |
457 | ||
458 | len = sizeof(struct icmp6hdr) + (target ? sizeof(*target) : 0); | |
459 | if (llinfo) | |
460 | len += ndisc_opt_addr_space(dev); | |
1da177e4 | 461 | |
d54a81d3 DM |
462 | skb = sock_alloc_send_skb(sk, |
463 | (MAX_HEADER + sizeof(struct ipv6hdr) + | |
f5184d26 | 464 | len + LL_ALLOCATED_SPACE(dev)), |
1da177e4 | 465 | 1, &err); |
e1ec7842 | 466 | if (!skb) { |
1da177e4 | 467 | ND_PRINTK0(KERN_ERR |
dae9de8e BH |
468 | "ICMPv6 ND: %s() failed to allocate an skb, err=%d.\n", |
469 | __func__, err); | |
305d552a | 470 | return NULL; |
1da177e4 LT |
471 | } |
472 | ||
473 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); | |
e1ec7842 | 474 | ip6_nd_hdr(sk, skb, dev, saddr, daddr, IPPROTO_ICMPV6, len); |
1da177e4 | 475 | |
27a884dc | 476 | skb->transport_header = skb->tail; |
d10ba34b | 477 | skb_put(skb, len); |
1da177e4 | 478 | |
e1ec7842 YH |
479 | hdr = (struct icmp6hdr *)skb_transport_header(skb); |
480 | memcpy(hdr, icmp6h, sizeof(*hdr)); | |
1da177e4 | 481 | |
e1ec7842 YH |
482 | opt = skb_transport_header(skb) + sizeof(struct icmp6hdr); |
483 | if (target) { | |
484 | ipv6_addr_copy((struct in6_addr *)opt, target); | |
485 | opt += sizeof(*target); | |
486 | } | |
1da177e4 | 487 | |
e1ec7842 YH |
488 | if (llinfo) |
489 | ndisc_fill_addr_option(opt, llinfo, dev->dev_addr, | |
1da177e4 LT |
490 | dev->addr_len, dev->type); |
491 | ||
e1ec7842 YH |
492 | hdr->icmp6_cksum = csum_ipv6_magic(saddr, daddr, len, |
493 | IPPROTO_ICMPV6, | |
07f0757a | 494 | csum_partial(hdr, |
e1ec7842 | 495 | len, 0)); |
1da177e4 | 496 | |
305d552a BH |
497 | return skb; |
498 | } | |
499 | ||
500 | EXPORT_SYMBOL(ndisc_build_skb); | |
501 | ||
502 | void ndisc_send_skb(struct sk_buff *skb, | |
503 | struct net_device *dev, | |
504 | struct neighbour *neigh, | |
505 | const struct in6_addr *daddr, | |
506 | const struct in6_addr *saddr, | |
507 | struct icmp6hdr *icmp6h) | |
508 | { | |
509 | struct flowi fl; | |
510 | struct dst_entry *dst; | |
511 | struct net *net = dev_net(dev); | |
512 | struct sock *sk = net->ipv6.ndisc_sk; | |
513 | struct inet6_dev *idev; | |
514 | int err; | |
515 | u8 type; | |
516 | ||
517 | type = icmp6h->icmp6_type; | |
518 | ||
519 | icmpv6_flow_init(sk, &fl, type, saddr, daddr, dev->ifindex); | |
520 | ||
521 | dst = icmp6_dst_alloc(dev, neigh, daddr); | |
522 | if (!dst) { | |
523 | kfree_skb(skb); | |
524 | return; | |
525 | } | |
526 | ||
52479b62 | 527 | err = xfrm_lookup(net, &dst, &fl, NULL, 0); |
305d552a BH |
528 | if (err < 0) { |
529 | kfree_skb(skb); | |
530 | return; | |
531 | } | |
532 | ||
adf30907 | 533 | skb_dst_set(skb, dst); |
e1ec7842 | 534 | |
1da177e4 | 535 | idev = in6_dev_get(dst->dev); |
edf391ff | 536 | IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len); |
e1ec7842 | 537 | |
6e23ae2a PM |
538 | err = NF_HOOK(PF_INET6, NF_INET_LOCAL_OUT, skb, NULL, dst->dev, |
539 | dst_output); | |
1da177e4 | 540 | if (!err) { |
5c5d244b | 541 | ICMP6MSGOUT_INC_STATS(net, idev, type); |
a862f6a6 | 542 | ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); |
1da177e4 LT |
543 | } |
544 | ||
545 | if (likely(idev != NULL)) | |
546 | in6_dev_put(idev); | |
1ab1457c | 547 | } |
1da177e4 | 548 | |
305d552a BH |
549 | EXPORT_SYMBOL(ndisc_send_skb); |
550 | ||
551 | /* | |
552 | * Send a Neighbour Discover packet | |
553 | */ | |
554 | static void __ndisc_send(struct net_device *dev, | |
555 | struct neighbour *neigh, | |
556 | const struct in6_addr *daddr, | |
557 | const struct in6_addr *saddr, | |
558 | struct icmp6hdr *icmp6h, const struct in6_addr *target, | |
559 | int llinfo) | |
560 | { | |
561 | struct sk_buff *skb; | |
562 | ||
563 | skb = ndisc_build_skb(dev, daddr, saddr, icmp6h, target, llinfo); | |
564 | if (!skb) | |
565 | return; | |
566 | ||
567 | ndisc_send_skb(skb, dev, neigh, daddr, saddr, icmp6h); | |
568 | } | |
569 | ||
e1ec7842 | 570 | static void ndisc_send_na(struct net_device *dev, struct neighbour *neigh, |
9acd9f3a YH |
571 | const struct in6_addr *daddr, |
572 | const struct in6_addr *solicited_addr, | |
573 | int router, int solicited, int override, int inc_opt) | |
e1ec7842 YH |
574 | { |
575 | struct in6_addr tmpaddr; | |
576 | struct inet6_ifaddr *ifp; | |
9acd9f3a | 577 | const struct in6_addr *src_addr; |
e1ec7842 YH |
578 | struct icmp6hdr icmp6h = { |
579 | .icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT, | |
580 | }; | |
581 | ||
582 | /* for anycast or proxy, solicited_addr != src_addr */ | |
c346dca1 | 583 | ifp = ipv6_get_ifaddr(dev_net(dev), solicited_addr, dev, 1); |
e1ec7842 YH |
584 | if (ifp) { |
585 | src_addr = solicited_addr; | |
586 | if (ifp->flags & IFA_F_OPTIMISTIC) | |
587 | override = 0; | |
588 | in6_ifa_put(ifp); | |
589 | } else { | |
191cd582 | 590 | if (ipv6_dev_get_saddr(dev_net(dev), dev, daddr, |
c346dca1 | 591 | inet6_sk(dev_net(dev)->ipv6.ndisc_sk)->srcprefs, |
7cbca67c | 592 | &tmpaddr)) |
e1ec7842 YH |
593 | return; |
594 | src_addr = &tmpaddr; | |
595 | } | |
596 | ||
597 | icmp6h.icmp6_router = router; | |
598 | icmp6h.icmp6_solicited = solicited; | |
599 | icmp6h.icmp6_override = override; | |
600 | ||
601 | __ndisc_send(dev, neigh, daddr, src_addr, | |
602 | &icmp6h, solicited_addr, | |
14878f75 | 603 | inc_opt ? ND_OPT_TARGET_LL_ADDR : 0); |
e1ec7842 YH |
604 | } |
605 | ||
1da177e4 | 606 | void ndisc_send_ns(struct net_device *dev, struct neighbour *neigh, |
9acd9f3a YH |
607 | const struct in6_addr *solicit, |
608 | const struct in6_addr *daddr, const struct in6_addr *saddr) | |
1da177e4 | 609 | { |
1da177e4 | 610 | struct in6_addr addr_buf; |
e1ec7842 YH |
611 | struct icmp6hdr icmp6h = { |
612 | .icmp6_type = NDISC_NEIGHBOUR_SOLICITATION, | |
613 | }; | |
1da177e4 LT |
614 | |
615 | if (saddr == NULL) { | |
95c385b4 NH |
616 | if (ipv6_get_lladdr(dev, &addr_buf, |
617 | (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC))) | |
1da177e4 LT |
618 | return; |
619 | saddr = &addr_buf; | |
620 | } | |
621 | ||
e1ec7842 YH |
622 | __ndisc_send(dev, neigh, daddr, saddr, |
623 | &icmp6h, solicit, | |
14878f75 | 624 | !ipv6_addr_any(saddr) ? ND_OPT_SOURCE_LL_ADDR : 0); |
1da177e4 LT |
625 | } |
626 | ||
9acd9f3a YH |
627 | void ndisc_send_rs(struct net_device *dev, const struct in6_addr *saddr, |
628 | const struct in6_addr *daddr) | |
1da177e4 | 629 | { |
e1ec7842 YH |
630 | struct icmp6hdr icmp6h = { |
631 | .icmp6_type = NDISC_ROUTER_SOLICITATION, | |
632 | }; | |
95c385b4 | 633 | int send_sllao = dev->addr_len; |
95c385b4 NH |
634 | |
635 | #ifdef CONFIG_IPV6_OPTIMISTIC_DAD | |
636 | /* | |
637 | * According to section 2.2 of RFC 4429, we must not | |
638 | * send router solicitations with a sllao from | |
639 | * optimistic addresses, but we may send the solicitation | |
640 | * if we don't include the sllao. So here we check | |
641 | * if our address is optimistic, and if so, we | |
bea85195 | 642 | * suppress the inclusion of the sllao. |
95c385b4 NH |
643 | */ |
644 | if (send_sllao) { | |
c346dca1 | 645 | struct inet6_ifaddr *ifp = ipv6_get_ifaddr(dev_net(dev), saddr, |
1cab3da6 | 646 | dev, 1); |
95c385b4 NH |
647 | if (ifp) { |
648 | if (ifp->flags & IFA_F_OPTIMISTIC) { | |
ca043569 | 649 | send_sllao = 0; |
95c385b4 | 650 | } |
ca043569 | 651 | in6_ifa_put(ifp); |
95c385b4 NH |
652 | } else { |
653 | send_sllao = 0; | |
654 | } | |
655 | } | |
656 | #endif | |
e1ec7842 YH |
657 | __ndisc_send(dev, NULL, daddr, saddr, |
658 | &icmp6h, NULL, | |
14878f75 | 659 | send_sllao ? ND_OPT_SOURCE_LL_ADDR : 0); |
1da177e4 | 660 | } |
64506929 | 661 | EXPORT_SYMBOL(ndisc_send_rs); |
1ab1457c | 662 | |
1da177e4 LT |
663 | |
664 | static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb) | |
665 | { | |
666 | /* | |
667 | * "The sender MUST return an ICMP | |
668 | * destination unreachable" | |
669 | */ | |
670 | dst_link_failure(skb); | |
671 | kfree_skb(skb); | |
672 | } | |
673 | ||
674 | /* Called with locked neigh: either read or both */ | |
675 | ||
676 | static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb) | |
677 | { | |
678 | struct in6_addr *saddr = NULL; | |
679 | struct in6_addr mcaddr; | |
680 | struct net_device *dev = neigh->dev; | |
681 | struct in6_addr *target = (struct in6_addr *)&neigh->primary_key; | |
682 | int probes = atomic_read(&neigh->probes); | |
683 | ||
c346dca1 | 684 | if (skb && ipv6_chk_addr(dev_net(dev), &ipv6_hdr(skb)->saddr, dev, 1)) |
0660e03f | 685 | saddr = &ipv6_hdr(skb)->saddr; |
1da177e4 LT |
686 | |
687 | if ((probes -= neigh->parms->ucast_probes) < 0) { | |
688 | if (!(neigh->nud_state & NUD_VALID)) { | |
5b095d98 | 689 | ND_PRINTK1(KERN_DEBUG "%s(): trying to ucast probe in NUD_INVALID: %pI6\n", |
0c6ce78a | 690 | __func__, target); |
1da177e4 LT |
691 | } |
692 | ndisc_send_ns(dev, neigh, target, target, saddr); | |
693 | } else if ((probes -= neigh->parms->app_probes) < 0) { | |
694 | #ifdef CONFIG_ARPD | |
695 | neigh_app_ns(neigh); | |
696 | #endif | |
697 | } else { | |
698 | addrconf_addr_solict_mult(target, &mcaddr); | |
699 | ndisc_send_ns(dev, NULL, target, &mcaddr, saddr); | |
700 | } | |
701 | } | |
702 | ||
0736ffc0 YH |
703 | static int pndisc_is_router(const void *pkey, |
704 | struct net_device *dev) | |
fa86d322 PE |
705 | { |
706 | struct pneigh_entry *n; | |
0736ffc0 | 707 | int ret = -1; |
fa86d322 PE |
708 | |
709 | read_lock_bh(&nd_tbl.lock); | |
0736ffc0 YH |
710 | n = __pneigh_lookup(&nd_tbl, dev_net(dev), pkey, dev); |
711 | if (n) | |
712 | ret = !!(n->flags & NTF_ROUTER); | |
fa86d322 PE |
713 | read_unlock_bh(&nd_tbl.lock); |
714 | ||
0736ffc0 | 715 | return ret; |
fa86d322 PE |
716 | } |
717 | ||
1da177e4 LT |
718 | static void ndisc_recv_ns(struct sk_buff *skb) |
719 | { | |
9c70220b | 720 | struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb); |
0660e03f ACM |
721 | struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; |
722 | struct in6_addr *daddr = &ipv6_hdr(skb)->daddr; | |
1da177e4 | 723 | u8 *lladdr = NULL; |
27a884dc ACM |
724 | u32 ndoptlen = skb->tail - (skb->transport_header + |
725 | offsetof(struct nd_msg, opt)); | |
1da177e4 LT |
726 | struct ndisc_options ndopts; |
727 | struct net_device *dev = skb->dev; | |
728 | struct inet6_ifaddr *ifp; | |
729 | struct inet6_dev *idev = NULL; | |
730 | struct neighbour *neigh; | |
731 | int dad = ipv6_addr_any(saddr); | |
732 | int inc; | |
0736ffc0 | 733 | int is_router = -1; |
1da177e4 LT |
734 | |
735 | if (ipv6_addr_is_multicast(&msg->target)) { | |
1ab1457c | 736 | ND_PRINTK2(KERN_WARNING |
1da177e4 LT |
737 | "ICMPv6 NS: multicast target address"); |
738 | return; | |
739 | } | |
740 | ||
741 | /* | |
742 | * RFC2461 7.1.1: | |
743 | * DAD has to be destined for solicited node multicast address. | |
744 | */ | |
745 | if (dad && | |
746 | !(daddr->s6_addr32[0] == htonl(0xff020000) && | |
747 | daddr->s6_addr32[1] == htonl(0x00000000) && | |
748 | daddr->s6_addr32[2] == htonl(0x00000001) && | |
749 | daddr->s6_addr [12] == 0xff )) { | |
750 | ND_PRINTK2(KERN_WARNING | |
751 | "ICMPv6 NS: bad DAD packet (wrong destination)\n"); | |
752 | return; | |
753 | } | |
754 | ||
755 | if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) { | |
1ab1457c | 756 | ND_PRINTK2(KERN_WARNING |
1da177e4 LT |
757 | "ICMPv6 NS: invalid ND options\n"); |
758 | return; | |
759 | } | |
760 | ||
761 | if (ndopts.nd_opts_src_lladdr) { | |
762 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, dev); | |
763 | if (!lladdr) { | |
764 | ND_PRINTK2(KERN_WARNING | |
765 | "ICMPv6 NS: invalid link-layer address length\n"); | |
766 | return; | |
767 | } | |
768 | ||
769 | /* RFC2461 7.1.1: | |
1ab1457c YH |
770 | * If the IP source address is the unspecified address, |
771 | * there MUST NOT be source link-layer address option | |
1da177e4 LT |
772 | * in the message. |
773 | */ | |
774 | if (dad) { | |
1ab1457c | 775 | ND_PRINTK2(KERN_WARNING |
1da177e4 LT |
776 | "ICMPv6 NS: bad DAD packet (link-layer address option)\n"); |
777 | return; | |
778 | } | |
779 | } | |
780 | ||
781 | inc = ipv6_addr_is_multicast(daddr); | |
782 | ||
c346dca1 | 783 | ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1); |
a18bc695 | 784 | if (ifp) { |
95c385b4 NH |
785 | |
786 | if (ifp->flags & (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC)) { | |
787 | if (dad) { | |
788 | if (dev->type == ARPHRD_IEEE802_TR) { | |
98e399f8 ACM |
789 | const unsigned char *sadr; |
790 | sadr = skb_mac_header(skb); | |
95c385b4 NH |
791 | if (((sadr[8] ^ dev->dev_addr[0]) & 0x7f) == 0 && |
792 | sadr[9] == dev->dev_addr[1] && | |
793 | sadr[10] == dev->dev_addr[2] && | |
794 | sadr[11] == dev->dev_addr[3] && | |
795 | sadr[12] == dev->dev_addr[4] && | |
796 | sadr[13] == dev->dev_addr[5]) { | |
797 | /* looped-back to us */ | |
798 | goto out; | |
799 | } | |
800 | } | |
801 | ||
802 | /* | |
803 | * We are colliding with another node | |
804 | * who is doing DAD | |
805 | * so fail our DAD process | |
806 | */ | |
807 | addrconf_dad_failure(ifp); | |
9e3be4b3 | 808 | return; |
95c385b4 NH |
809 | } else { |
810 | /* | |
811 | * This is not a dad solicitation. | |
812 | * If we are an optimistic node, | |
813 | * we should respond. | |
814 | * Otherwise, we should ignore it. | |
815 | */ | |
816 | if (!(ifp->flags & IFA_F_OPTIMISTIC)) | |
1da177e4 | 817 | goto out; |
1da177e4 | 818 | } |
1da177e4 LT |
819 | } |
820 | ||
821 | idev = ifp->idev; | |
822 | } else { | |
53b7997f YH |
823 | struct net *net = dev_net(dev); |
824 | ||
1da177e4 LT |
825 | idev = in6_dev_get(dev); |
826 | if (!idev) { | |
827 | /* XXX: count this drop? */ | |
828 | return; | |
829 | } | |
830 | ||
53b7997f | 831 | if (ipv6_chk_acast_addr(net, dev, &msg->target) || |
1ab1457c | 832 | (idev->cnf.forwarding && |
53b7997f | 833 | (net->ipv6.devconf_all->proxy_ndp || idev->cnf.proxy_ndp) && |
0736ffc0 | 834 | (is_router = pndisc_is_router(&msg->target, dev)) >= 0)) { |
a61bbcf2 | 835 | if (!(NEIGH_CB(skb)->flags & LOCALLY_ENQUEUED) && |
1da177e4 LT |
836 | skb->pkt_type != PACKET_HOST && |
837 | inc != 0 && | |
838 | idev->nd_parms->proxy_delay != 0) { | |
839 | /* | |
840 | * for anycast or proxy, | |
1ab1457c YH |
841 | * sender should delay its response |
842 | * by a random time between 0 and | |
1da177e4 LT |
843 | * MAX_ANYCAST_DELAY_TIME seconds. |
844 | * (RFC2461) -- yoshfuji | |
845 | */ | |
846 | struct sk_buff *n = skb_clone(skb, GFP_ATOMIC); | |
847 | if (n) | |
848 | pneigh_enqueue(&nd_tbl, idev->nd_parms, n); | |
849 | goto out; | |
850 | } | |
851 | } else | |
852 | goto out; | |
853 | } | |
854 | ||
0736ffc0 YH |
855 | if (is_router < 0) |
856 | is_router = !!idev->cnf.forwarding; | |
62dd9318 | 857 | |
1da177e4 | 858 | if (dad) { |
f3ee4010 | 859 | ndisc_send_na(dev, NULL, &in6addr_linklocal_allnodes, &msg->target, |
62dd9318 | 860 | is_router, 0, (ifp != NULL), 1); |
1da177e4 LT |
861 | goto out; |
862 | } | |
863 | ||
864 | if (inc) | |
865 | NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_mcast); | |
866 | else | |
867 | NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_ucast); | |
868 | ||
1ab1457c | 869 | /* |
1da177e4 LT |
870 | * update / create cache entry |
871 | * for the source address | |
872 | */ | |
873 | neigh = __neigh_lookup(&nd_tbl, saddr, dev, | |
874 | !inc || lladdr || !dev->addr_len); | |
875 | if (neigh) | |
1ab1457c | 876 | neigh_update(neigh, lladdr, NUD_STALE, |
1da177e4 LT |
877 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
878 | NEIGH_UPDATE_F_OVERRIDE); | |
3b04ddde | 879 | if (neigh || !dev->header_ops) { |
1da177e4 | 880 | ndisc_send_na(dev, neigh, saddr, &msg->target, |
62dd9318 | 881 | is_router, |
1da177e4 LT |
882 | 1, (ifp != NULL && inc), inc); |
883 | if (neigh) | |
884 | neigh_release(neigh); | |
885 | } | |
886 | ||
887 | out: | |
888 | if (ifp) | |
889 | in6_ifa_put(ifp); | |
890 | else | |
891 | in6_dev_put(idev); | |
892 | ||
893 | return; | |
894 | } | |
895 | ||
896 | static void ndisc_recv_na(struct sk_buff *skb) | |
897 | { | |
9c70220b | 898 | struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb); |
0660e03f ACM |
899 | struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; |
900 | struct in6_addr *daddr = &ipv6_hdr(skb)->daddr; | |
1da177e4 | 901 | u8 *lladdr = NULL; |
27a884dc ACM |
902 | u32 ndoptlen = skb->tail - (skb->transport_header + |
903 | offsetof(struct nd_msg, opt)); | |
1da177e4 LT |
904 | struct ndisc_options ndopts; |
905 | struct net_device *dev = skb->dev; | |
906 | struct inet6_ifaddr *ifp; | |
907 | struct neighbour *neigh; | |
908 | ||
909 | if (skb->len < sizeof(struct nd_msg)) { | |
910 | ND_PRINTK2(KERN_WARNING | |
911 | "ICMPv6 NA: packet too short\n"); | |
912 | return; | |
913 | } | |
914 | ||
915 | if (ipv6_addr_is_multicast(&msg->target)) { | |
916 | ND_PRINTK2(KERN_WARNING | |
917 | "ICMPv6 NA: target address is multicast.\n"); | |
918 | return; | |
919 | } | |
920 | ||
921 | if (ipv6_addr_is_multicast(daddr) && | |
922 | msg->icmph.icmp6_solicited) { | |
923 | ND_PRINTK2(KERN_WARNING | |
924 | "ICMPv6 NA: solicited NA is multicasted.\n"); | |
925 | return; | |
926 | } | |
1ab1457c | 927 | |
1da177e4 LT |
928 | if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) { |
929 | ND_PRINTK2(KERN_WARNING | |
930 | "ICMPv6 NS: invalid ND option\n"); | |
931 | return; | |
932 | } | |
933 | if (ndopts.nd_opts_tgt_lladdr) { | |
934 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, dev); | |
935 | if (!lladdr) { | |
936 | ND_PRINTK2(KERN_WARNING | |
937 | "ICMPv6 NA: invalid link-layer address length\n"); | |
938 | return; | |
939 | } | |
940 | } | |
c346dca1 | 941 | ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1); |
a18bc695 | 942 | if (ifp) { |
1da177e4 LT |
943 | if (ifp->flags & IFA_F_TENTATIVE) { |
944 | addrconf_dad_failure(ifp); | |
945 | return; | |
946 | } | |
947 | /* What should we make now? The advertisement | |
948 | is invalid, but ndisc specs say nothing | |
949 | about it. It could be misconfiguration, or | |
950 | an smart proxy agent tries to help us :-) | |
24fc7b86 JS |
951 | |
952 | We should not print the error if NA has been | |
953 | received from loopback - it is just our own | |
954 | unsolicited advertisement. | |
1da177e4 | 955 | */ |
24fc7b86 JS |
956 | if (skb->pkt_type != PACKET_LOOPBACK) |
957 | ND_PRINTK1(KERN_WARNING | |
a6fa3286 JR |
958 | "ICMPv6 NA: someone advertises our address %pI6 on %s!\n", |
959 | &ifp->addr, ifp->idev->dev->name); | |
1da177e4 LT |
960 | in6_ifa_put(ifp); |
961 | return; | |
962 | } | |
963 | neigh = neigh_lookup(&nd_tbl, &msg->target, dev); | |
964 | ||
965 | if (neigh) { | |
966 | u8 old_flags = neigh->flags; | |
53b7997f | 967 | struct net *net = dev_net(dev); |
1da177e4 LT |
968 | |
969 | if (neigh->nud_state & NUD_FAILED) | |
970 | goto out; | |
971 | ||
5f3e6e9e VN |
972 | /* |
973 | * Don't update the neighbor cache entry on a proxy NA from | |
974 | * ourselves because either the proxied node is off link or it | |
975 | * has already sent a NA to us. | |
976 | */ | |
977 | if (lladdr && !memcmp(lladdr, dev->dev_addr, dev->addr_len) && | |
53b7997f YH |
978 | net->ipv6.devconf_all->forwarding && net->ipv6.devconf_all->proxy_ndp && |
979 | pneigh_lookup(&nd_tbl, net, &msg->target, dev, 0)) { | |
fbea49e1 | 980 | /* XXX: idev->cnf.prixy_ndp */ |
5f3e6e9e | 981 | goto out; |
fbea49e1 | 982 | } |
5f3e6e9e | 983 | |
1da177e4 LT |
984 | neigh_update(neigh, lladdr, |
985 | msg->icmph.icmp6_solicited ? NUD_REACHABLE : NUD_STALE, | |
986 | NEIGH_UPDATE_F_WEAK_OVERRIDE| | |
987 | (msg->icmph.icmp6_override ? NEIGH_UPDATE_F_OVERRIDE : 0)| | |
988 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
989 | (msg->icmph.icmp6_router ? NEIGH_UPDATE_F_ISROUTER : 0)); | |
990 | ||
991 | if ((old_flags & ~neigh->flags) & NTF_ROUTER) { | |
992 | /* | |
993 | * Change: router to host | |
994 | */ | |
995 | struct rt6_info *rt; | |
996 | rt = rt6_get_dflt_router(saddr, dev); | |
997 | if (rt) | |
e0a1ad73 | 998 | ip6_del_rt(rt); |
1da177e4 LT |
999 | } |
1000 | ||
1001 | out: | |
1002 | neigh_release(neigh); | |
1003 | } | |
1004 | } | |
1005 | ||
1006 | static void ndisc_recv_rs(struct sk_buff *skb) | |
1007 | { | |
9c70220b | 1008 | struct rs_msg *rs_msg = (struct rs_msg *)skb_transport_header(skb); |
1da177e4 LT |
1009 | unsigned long ndoptlen = skb->len - sizeof(*rs_msg); |
1010 | struct neighbour *neigh; | |
1011 | struct inet6_dev *idev; | |
0660e03f | 1012 | struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; |
1da177e4 LT |
1013 | struct ndisc_options ndopts; |
1014 | u8 *lladdr = NULL; | |
1015 | ||
1016 | if (skb->len < sizeof(*rs_msg)) | |
1017 | return; | |
1018 | ||
1019 | idev = in6_dev_get(skb->dev); | |
1020 | if (!idev) { | |
1021 | if (net_ratelimit()) | |
1022 | ND_PRINTK1("ICMP6 RS: can't find in6 device\n"); | |
1023 | return; | |
1024 | } | |
1025 | ||
1026 | /* Don't accept RS if we're not in router mode */ | |
1027 | if (!idev->cnf.forwarding) | |
1028 | goto out; | |
1029 | ||
1030 | /* | |
1031 | * Don't update NCE if src = ::; | |
1032 | * this implies that the source node has no ip address assigned yet. | |
1033 | */ | |
1034 | if (ipv6_addr_any(saddr)) | |
1035 | goto out; | |
1036 | ||
1037 | /* Parse ND options */ | |
1038 | if (!ndisc_parse_options(rs_msg->opt, ndoptlen, &ndopts)) { | |
1039 | if (net_ratelimit()) | |
1040 | ND_PRINTK2("ICMP6 NS: invalid ND option, ignored\n"); | |
1041 | goto out; | |
1042 | } | |
1043 | ||
1044 | if (ndopts.nd_opts_src_lladdr) { | |
1045 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, | |
1046 | skb->dev); | |
1047 | if (!lladdr) | |
1048 | goto out; | |
1049 | } | |
1050 | ||
1051 | neigh = __neigh_lookup(&nd_tbl, saddr, skb->dev, 1); | |
1052 | if (neigh) { | |
1053 | neigh_update(neigh, lladdr, NUD_STALE, | |
1054 | NEIGH_UPDATE_F_WEAK_OVERRIDE| | |
1055 | NEIGH_UPDATE_F_OVERRIDE| | |
1056 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER); | |
1057 | neigh_release(neigh); | |
1058 | } | |
1059 | out: | |
1060 | in6_dev_put(idev); | |
1061 | } | |
1062 | ||
31910575 PY |
1063 | static void ndisc_ra_useropt(struct sk_buff *ra, struct nd_opt_hdr *opt) |
1064 | { | |
1065 | struct icmp6hdr *icmp6h = (struct icmp6hdr *)skb_transport_header(ra); | |
1066 | struct sk_buff *skb; | |
1067 | struct nlmsghdr *nlh; | |
1068 | struct nduseroptmsg *ndmsg; | |
c346dca1 | 1069 | struct net *net = dev_net(ra->dev); |
31910575 PY |
1070 | int err; |
1071 | int base_size = NLMSG_ALIGN(sizeof(struct nduseroptmsg) | |
1072 | + (opt->nd_opt_len << 3)); | |
1073 | size_t msg_size = base_size + nla_total_size(sizeof(struct in6_addr)); | |
1074 | ||
1075 | skb = nlmsg_new(msg_size, GFP_ATOMIC); | |
1076 | if (skb == NULL) { | |
1077 | err = -ENOBUFS; | |
1078 | goto errout; | |
1079 | } | |
1080 | ||
1081 | nlh = nlmsg_put(skb, 0, 0, RTM_NEWNDUSEROPT, base_size, 0); | |
1082 | if (nlh == NULL) { | |
1083 | goto nla_put_failure; | |
1084 | } | |
1085 | ||
1086 | ndmsg = nlmsg_data(nlh); | |
1087 | ndmsg->nduseropt_family = AF_INET6; | |
dbb2ed24 | 1088 | ndmsg->nduseropt_ifindex = ra->dev->ifindex; |
31910575 PY |
1089 | ndmsg->nduseropt_icmp_type = icmp6h->icmp6_type; |
1090 | ndmsg->nduseropt_icmp_code = icmp6h->icmp6_code; | |
1091 | ndmsg->nduseropt_opts_len = opt->nd_opt_len << 3; | |
1092 | ||
1093 | memcpy(ndmsg + 1, opt, opt->nd_opt_len << 3); | |
1094 | ||
1095 | NLA_PUT(skb, NDUSEROPT_SRCADDR, sizeof(struct in6_addr), | |
1096 | &ipv6_hdr(ra)->saddr); | |
1097 | nlmsg_end(skb, nlh); | |
1098 | ||
1ce85fe4 | 1099 | rtnl_notify(skb, net, 0, RTNLGRP_ND_USEROPT, NULL, GFP_ATOMIC); |
31910575 PY |
1100 | return; |
1101 | ||
1102 | nla_put_failure: | |
1103 | nlmsg_free(skb); | |
1104 | err = -EMSGSIZE; | |
1105 | errout: | |
a18bc695 | 1106 | rtnl_set_sk_err(net, RTNLGRP_ND_USEROPT, err); |
31910575 PY |
1107 | } |
1108 | ||
1da177e4 LT |
1109 | static void ndisc_router_discovery(struct sk_buff *skb) |
1110 | { | |
9c70220b | 1111 | struct ra_msg *ra_msg = (struct ra_msg *)skb_transport_header(skb); |
1da177e4 LT |
1112 | struct neighbour *neigh = NULL; |
1113 | struct inet6_dev *in6_dev; | |
65f5c7c1 | 1114 | struct rt6_info *rt = NULL; |
1da177e4 LT |
1115 | int lifetime; |
1116 | struct ndisc_options ndopts; | |
1117 | int optlen; | |
ebacaaa0 | 1118 | unsigned int pref = 0; |
1da177e4 LT |
1119 | |
1120 | __u8 * opt = (__u8 *)(ra_msg + 1); | |
1121 | ||
27a884dc | 1122 | optlen = (skb->tail - skb->transport_header) - sizeof(struct ra_msg); |
1da177e4 | 1123 | |
0660e03f | 1124 | if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) { |
1da177e4 LT |
1125 | ND_PRINTK2(KERN_WARNING |
1126 | "ICMPv6 RA: source address is not link-local.\n"); | |
1127 | return; | |
1128 | } | |
1129 | if (optlen < 0) { | |
1ab1457c | 1130 | ND_PRINTK2(KERN_WARNING |
1da177e4 LT |
1131 | "ICMPv6 RA: packet too short\n"); |
1132 | return; | |
1133 | } | |
1134 | ||
de357cc0 | 1135 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 TF |
1136 | if (skb->ndisc_nodetype == NDISC_NODETYPE_HOST) { |
1137 | ND_PRINTK2(KERN_WARNING | |
1138 | "ICMPv6 RA: from host or unauthorized router\n"); | |
1139 | return; | |
1140 | } | |
de357cc0 | 1141 | #endif |
fadf6bf0 | 1142 | |
1da177e4 LT |
1143 | /* |
1144 | * set the RA_RECV flag in the interface | |
1145 | */ | |
1146 | ||
1147 | in6_dev = in6_dev_get(skb->dev); | |
1148 | if (in6_dev == NULL) { | |
1149 | ND_PRINTK0(KERN_ERR | |
1150 | "ICMPv6 RA: can't find inet6 device for %s.\n", | |
1151 | skb->dev->name); | |
1152 | return; | |
1153 | } | |
1154 | if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_ra) { | |
1155 | in6_dev_put(in6_dev); | |
1156 | return; | |
1157 | } | |
1158 | ||
1159 | if (!ndisc_parse_options(opt, optlen, &ndopts)) { | |
1160 | in6_dev_put(in6_dev); | |
1161 | ND_PRINTK2(KERN_WARNING | |
1162 | "ICMP6 RA: invalid ND options\n"); | |
1163 | return; | |
1164 | } | |
1165 | ||
de357cc0 | 1166 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 TF |
1167 | /* skip link-specific parameters from interior routers */ |
1168 | if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT) | |
1169 | goto skip_linkparms; | |
de357cc0 | 1170 | #endif |
fadf6bf0 | 1171 | |
1da177e4 LT |
1172 | if (in6_dev->if_flags & IF_RS_SENT) { |
1173 | /* | |
1174 | * flag that an RA was received after an RS was sent | |
1175 | * out on this interface. | |
1176 | */ | |
1177 | in6_dev->if_flags |= IF_RA_RCVD; | |
1178 | } | |
1179 | ||
1180 | /* | |
1181 | * Remember the managed/otherconf flags from most recently | |
1182 | * received RA message (RFC 2462) -- yoshfuji | |
1183 | */ | |
1184 | in6_dev->if_flags = (in6_dev->if_flags & ~(IF_RA_MANAGED | | |
1185 | IF_RA_OTHERCONF)) | | |
1186 | (ra_msg->icmph.icmp6_addrconf_managed ? | |
1187 | IF_RA_MANAGED : 0) | | |
1188 | (ra_msg->icmph.icmp6_addrconf_other ? | |
1189 | IF_RA_OTHERCONF : 0); | |
1190 | ||
65f5c7c1 YH |
1191 | if (!in6_dev->cnf.accept_ra_defrtr) |
1192 | goto skip_defrtr; | |
1193 | ||
1da177e4 LT |
1194 | lifetime = ntohs(ra_msg->icmph.icmp6_rt_lifetime); |
1195 | ||
ebacaaa0 YH |
1196 | #ifdef CONFIG_IPV6_ROUTER_PREF |
1197 | pref = ra_msg->icmph.icmp6_router_pref; | |
1198 | /* 10b is handled as if it were 00b (medium) */ | |
930d6ff2 | 1199 | if (pref == ICMPV6_ROUTER_PREF_INVALID || |
6d5b78cd | 1200 | !in6_dev->cnf.accept_ra_rtr_pref) |
ebacaaa0 YH |
1201 | pref = ICMPV6_ROUTER_PREF_MEDIUM; |
1202 | #endif | |
1203 | ||
0660e03f | 1204 | rt = rt6_get_dflt_router(&ipv6_hdr(skb)->saddr, skb->dev); |
1da177e4 LT |
1205 | |
1206 | if (rt) | |
1207 | neigh = rt->rt6i_nexthop; | |
1208 | ||
1209 | if (rt && lifetime == 0) { | |
1210 | neigh_clone(neigh); | |
e0a1ad73 | 1211 | ip6_del_rt(rt); |
1da177e4 LT |
1212 | rt = NULL; |
1213 | } | |
1214 | ||
1215 | if (rt == NULL && lifetime) { | |
1216 | ND_PRINTK3(KERN_DEBUG | |
1217 | "ICMPv6 RA: adding default router.\n"); | |
1218 | ||
0660e03f | 1219 | rt = rt6_add_dflt_router(&ipv6_hdr(skb)->saddr, skb->dev, pref); |
1da177e4 LT |
1220 | if (rt == NULL) { |
1221 | ND_PRINTK0(KERN_ERR | |
1222 | "ICMPv6 RA: %s() failed to add default route.\n", | |
0dc47877 | 1223 | __func__); |
1da177e4 LT |
1224 | in6_dev_put(in6_dev); |
1225 | return; | |
1226 | } | |
1227 | ||
1228 | neigh = rt->rt6i_nexthop; | |
1229 | if (neigh == NULL) { | |
1230 | ND_PRINTK0(KERN_ERR | |
1231 | "ICMPv6 RA: %s() got default router without neighbour.\n", | |
0dc47877 | 1232 | __func__); |
1da177e4 LT |
1233 | dst_release(&rt->u.dst); |
1234 | in6_dev_put(in6_dev); | |
1235 | return; | |
1236 | } | |
1237 | neigh->flags |= NTF_ROUTER; | |
ebacaaa0 | 1238 | } else if (rt) { |
22441cfa | 1239 | rt->rt6i_flags = (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); |
1da177e4 LT |
1240 | } |
1241 | ||
1242 | if (rt) | |
1243 | rt->rt6i_expires = jiffies + (HZ * lifetime); | |
1244 | ||
1245 | if (ra_msg->icmph.icmp6_hop_limit) { | |
1246 | in6_dev->cnf.hop_limit = ra_msg->icmph.icmp6_hop_limit; | |
1247 | if (rt) | |
1248 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = ra_msg->icmph.icmp6_hop_limit; | |
1249 | } | |
1250 | ||
65f5c7c1 YH |
1251 | skip_defrtr: |
1252 | ||
1da177e4 LT |
1253 | /* |
1254 | * Update Reachable Time and Retrans Timer | |
1255 | */ | |
1256 | ||
1257 | if (in6_dev->nd_parms) { | |
1258 | unsigned long rtime = ntohl(ra_msg->retrans_timer); | |
1259 | ||
1260 | if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/HZ) { | |
1261 | rtime = (rtime*HZ)/1000; | |
1262 | if (rtime < HZ/10) | |
1263 | rtime = HZ/10; | |
1264 | in6_dev->nd_parms->retrans_time = rtime; | |
1265 | in6_dev->tstamp = jiffies; | |
1266 | inet6_ifinfo_notify(RTM_NEWLINK, in6_dev); | |
1267 | } | |
1268 | ||
1269 | rtime = ntohl(ra_msg->reachable_time); | |
1270 | if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/(3*HZ)) { | |
1271 | rtime = (rtime*HZ)/1000; | |
1272 | ||
1273 | if (rtime < HZ/10) | |
1274 | rtime = HZ/10; | |
1275 | ||
1276 | if (rtime != in6_dev->nd_parms->base_reachable_time) { | |
1277 | in6_dev->nd_parms->base_reachable_time = rtime; | |
1278 | in6_dev->nd_parms->gc_staletime = 3 * rtime; | |
1279 | in6_dev->nd_parms->reachable_time = neigh_rand_reach_time(rtime); | |
1280 | in6_dev->tstamp = jiffies; | |
1281 | inet6_ifinfo_notify(RTM_NEWLINK, in6_dev); | |
1282 | } | |
1283 | } | |
1284 | } | |
1285 | ||
de357cc0 | 1286 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 | 1287 | skip_linkparms: |
de357cc0 | 1288 | #endif |
fadf6bf0 | 1289 | |
1da177e4 LT |
1290 | /* |
1291 | * Process options. | |
1292 | */ | |
1293 | ||
1294 | if (!neigh) | |
0660e03f | 1295 | neigh = __neigh_lookup(&nd_tbl, &ipv6_hdr(skb)->saddr, |
1da177e4 LT |
1296 | skb->dev, 1); |
1297 | if (neigh) { | |
1298 | u8 *lladdr = NULL; | |
1299 | if (ndopts.nd_opts_src_lladdr) { | |
1300 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, | |
1301 | skb->dev); | |
1302 | if (!lladdr) { | |
1303 | ND_PRINTK2(KERN_WARNING | |
1304 | "ICMPv6 RA: invalid link-layer address length\n"); | |
1305 | goto out; | |
1306 | } | |
1307 | } | |
1308 | neigh_update(neigh, lladdr, NUD_STALE, | |
1309 | NEIGH_UPDATE_F_WEAK_OVERRIDE| | |
1310 | NEIGH_UPDATE_F_OVERRIDE| | |
1311 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
1312 | NEIGH_UPDATE_F_ISROUTER); | |
1313 | } | |
1314 | ||
70ceb4f5 | 1315 | #ifdef CONFIG_IPV6_ROUTE_INFO |
09c884d4 | 1316 | if (in6_dev->cnf.accept_ra_rtr_pref && ndopts.nd_opts_ri) { |
70ceb4f5 YH |
1317 | struct nd_opt_hdr *p; |
1318 | for (p = ndopts.nd_opts_ri; | |
1319 | p; | |
1320 | p = ndisc_next_option(p, ndopts.nd_opts_ri_end)) { | |
6294e000 YH |
1321 | struct route_info *ri = (struct route_info *)p; |
1322 | #ifdef CONFIG_IPV6_NDISC_NODETYPE | |
1323 | if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT && | |
1324 | ri->prefix_len == 0) | |
1325 | continue; | |
1326 | #endif | |
1327 | if (ri->prefix_len > in6_dev->cnf.accept_ra_rt_info_max_plen) | |
09c884d4 | 1328 | continue; |
70ceb4f5 | 1329 | rt6_route_rcv(skb->dev, (u8*)p, (p->nd_opt_len) << 3, |
0660e03f | 1330 | &ipv6_hdr(skb)->saddr); |
70ceb4f5 YH |
1331 | } |
1332 | } | |
1333 | #endif | |
1334 | ||
de357cc0 | 1335 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 TF |
1336 | /* skip link-specific ndopts from interior routers */ |
1337 | if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT) | |
1338 | goto out; | |
de357cc0 | 1339 | #endif |
fadf6bf0 | 1340 | |
c4fd30eb | 1341 | if (in6_dev->cnf.accept_ra_pinfo && ndopts.nd_opts_pi) { |
1da177e4 LT |
1342 | struct nd_opt_hdr *p; |
1343 | for (p = ndopts.nd_opts_pi; | |
1344 | p; | |
1345 | p = ndisc_next_option(p, ndopts.nd_opts_pi_end)) { | |
1346 | addrconf_prefix_rcv(skb->dev, (u8*)p, (p->nd_opt_len) << 3); | |
1347 | } | |
1348 | } | |
1349 | ||
1350 | if (ndopts.nd_opts_mtu) { | |
e69a4adc | 1351 | __be32 n; |
1da177e4 LT |
1352 | u32 mtu; |
1353 | ||
e69a4adc AV |
1354 | memcpy(&n, ((u8*)(ndopts.nd_opts_mtu+1))+2, sizeof(mtu)); |
1355 | mtu = ntohl(n); | |
1da177e4 LT |
1356 | |
1357 | if (mtu < IPV6_MIN_MTU || mtu > skb->dev->mtu) { | |
1358 | ND_PRINTK2(KERN_WARNING | |
1359 | "ICMPv6 RA: invalid mtu: %d\n", | |
1360 | mtu); | |
1361 | } else if (in6_dev->cnf.mtu6 != mtu) { | |
1362 | in6_dev->cnf.mtu6 = mtu; | |
1363 | ||
1364 | if (rt) | |
1365 | rt->u.dst.metrics[RTAX_MTU-1] = mtu; | |
1366 | ||
1367 | rt6_mtu_change(skb->dev, mtu); | |
1368 | } | |
1369 | } | |
1ab1457c | 1370 | |
31910575 | 1371 | if (ndopts.nd_useropts) { |
61cf46ad YH |
1372 | struct nd_opt_hdr *p; |
1373 | for (p = ndopts.nd_useropts; | |
1374 | p; | |
1375 | p = ndisc_next_useropt(p, ndopts.nd_useropts_end)) { | |
1376 | ndisc_ra_useropt(skb, p); | |
31910575 PY |
1377 | } |
1378 | } | |
1379 | ||
1da177e4 LT |
1380 | if (ndopts.nd_opts_tgt_lladdr || ndopts.nd_opts_rh) { |
1381 | ND_PRINTK2(KERN_WARNING | |
1382 | "ICMPv6 RA: invalid RA options"); | |
1383 | } | |
1384 | out: | |
1385 | if (rt) | |
1386 | dst_release(&rt->u.dst); | |
1387 | else if (neigh) | |
1388 | neigh_release(neigh); | |
1389 | in6_dev_put(in6_dev); | |
1390 | } | |
1391 | ||
1392 | static void ndisc_redirect_rcv(struct sk_buff *skb) | |
1393 | { | |
1394 | struct inet6_dev *in6_dev; | |
1395 | struct icmp6hdr *icmph; | |
1396 | struct in6_addr *dest; | |
1397 | struct in6_addr *target; /* new first hop to destination */ | |
1398 | struct neighbour *neigh; | |
1399 | int on_link = 0; | |
1400 | struct ndisc_options ndopts; | |
1401 | int optlen; | |
1402 | u8 *lladdr = NULL; | |
1403 | ||
de357cc0 | 1404 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 TF |
1405 | switch (skb->ndisc_nodetype) { |
1406 | case NDISC_NODETYPE_HOST: | |
1407 | case NDISC_NODETYPE_NODEFAULT: | |
1408 | ND_PRINTK2(KERN_WARNING | |
1409 | "ICMPv6 Redirect: from host or unauthorized router\n"); | |
1410 | return; | |
1411 | } | |
de357cc0 | 1412 | #endif |
fadf6bf0 | 1413 | |
0660e03f | 1414 | if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) { |
1da177e4 LT |
1415 | ND_PRINTK2(KERN_WARNING |
1416 | "ICMPv6 Redirect: source address is not link-local.\n"); | |
1417 | return; | |
1418 | } | |
1419 | ||
27a884dc | 1420 | optlen = skb->tail - skb->transport_header; |
1da177e4 LT |
1421 | optlen -= sizeof(struct icmp6hdr) + 2 * sizeof(struct in6_addr); |
1422 | ||
1423 | if (optlen < 0) { | |
1424 | ND_PRINTK2(KERN_WARNING | |
1425 | "ICMPv6 Redirect: packet too short\n"); | |
1426 | return; | |
1427 | } | |
1428 | ||
cc70ab26 | 1429 | icmph = icmp6_hdr(skb); |
1da177e4 LT |
1430 | target = (struct in6_addr *) (icmph + 1); |
1431 | dest = target + 1; | |
1432 | ||
1433 | if (ipv6_addr_is_multicast(dest)) { | |
1434 | ND_PRINTK2(KERN_WARNING | |
1435 | "ICMPv6 Redirect: destination address is multicast.\n"); | |
1436 | return; | |
1437 | } | |
1438 | ||
1439 | if (ipv6_addr_equal(dest, target)) { | |
1440 | on_link = 1; | |
bf0b48df BH |
1441 | } else if (ipv6_addr_type(target) != |
1442 | (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) { | |
1ab1457c | 1443 | ND_PRINTK2(KERN_WARNING |
bf0b48df | 1444 | "ICMPv6 Redirect: target address is not link-local unicast.\n"); |
1da177e4 LT |
1445 | return; |
1446 | } | |
1447 | ||
1448 | in6_dev = in6_dev_get(skb->dev); | |
1449 | if (!in6_dev) | |
1450 | return; | |
1451 | if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects) { | |
1452 | in6_dev_put(in6_dev); | |
1453 | return; | |
1454 | } | |
1455 | ||
1ab1457c | 1456 | /* RFC2461 8.1: |
1da177e4 LT |
1457 | * The IP source address of the Redirect MUST be the same as the current |
1458 | * first-hop router for the specified ICMP Destination Address. | |
1459 | */ | |
1ab1457c | 1460 | |
1da177e4 LT |
1461 | if (!ndisc_parse_options((u8*)(dest + 1), optlen, &ndopts)) { |
1462 | ND_PRINTK2(KERN_WARNING | |
1463 | "ICMPv6 Redirect: invalid ND options\n"); | |
1464 | in6_dev_put(in6_dev); | |
1465 | return; | |
1466 | } | |
1467 | if (ndopts.nd_opts_tgt_lladdr) { | |
1468 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, | |
1469 | skb->dev); | |
1470 | if (!lladdr) { | |
1471 | ND_PRINTK2(KERN_WARNING | |
1472 | "ICMPv6 Redirect: invalid link-layer address length\n"); | |
1473 | in6_dev_put(in6_dev); | |
1474 | return; | |
1475 | } | |
1476 | } | |
1477 | ||
1478 | neigh = __neigh_lookup(&nd_tbl, target, skb->dev, 1); | |
1479 | if (neigh) { | |
0660e03f ACM |
1480 | rt6_redirect(dest, &ipv6_hdr(skb)->daddr, |
1481 | &ipv6_hdr(skb)->saddr, neigh, lladdr, | |
1da177e4 LT |
1482 | on_link); |
1483 | neigh_release(neigh); | |
1484 | } | |
1485 | in6_dev_put(in6_dev); | |
1486 | } | |
1487 | ||
1488 | void ndisc_send_redirect(struct sk_buff *skb, struct neighbour *neigh, | |
9acd9f3a | 1489 | const struct in6_addr *target) |
1da177e4 | 1490 | { |
1762f7e8 | 1491 | struct net_device *dev = skb->dev; |
c346dca1 | 1492 | struct net *net = dev_net(dev); |
1762f7e8 | 1493 | struct sock *sk = net->ipv6.ndisc_sk; |
1da177e4 LT |
1494 | int len = sizeof(struct icmp6hdr) + 2 * sizeof(struct in6_addr); |
1495 | struct sk_buff *buff; | |
1496 | struct icmp6hdr *icmph; | |
1497 | struct in6_addr saddr_buf; | |
1498 | struct in6_addr *addrp; | |
1da177e4 LT |
1499 | struct rt6_info *rt; |
1500 | struct dst_entry *dst; | |
1501 | struct inet6_dev *idev; | |
1502 | struct flowi fl; | |
1503 | u8 *opt; | |
1504 | int rd_len; | |
1505 | int err; | |
1da177e4 LT |
1506 | u8 ha_buf[MAX_ADDR_LEN], *ha = NULL; |
1507 | ||
95c385b4 | 1508 | if (ipv6_get_lladdr(dev, &saddr_buf, IFA_F_TENTATIVE)) { |
1da177e4 LT |
1509 | ND_PRINTK2(KERN_WARNING |
1510 | "ICMPv6 Redirect: no link-local address on %s\n", | |
1511 | dev->name); | |
1ab1457c YH |
1512 | return; |
1513 | } | |
1da177e4 | 1514 | |
0660e03f | 1515 | if (!ipv6_addr_equal(&ipv6_hdr(skb)->daddr, target) && |
bf0b48df | 1516 | ipv6_addr_type(target) != (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) { |
29556526 | 1517 | ND_PRINTK2(KERN_WARNING |
bf0b48df | 1518 | "ICMPv6 Redirect: target address is not link-local unicast.\n"); |
29556526 LY |
1519 | return; |
1520 | } | |
1521 | ||
1762f7e8 | 1522 | icmpv6_flow_init(sk, &fl, NDISC_REDIRECT, |
95e41e93 | 1523 | &saddr_buf, &ipv6_hdr(skb)->saddr, dev->ifindex); |
1da177e4 | 1524 | |
1762f7e8 | 1525 | dst = ip6_route_output(net, NULL, &fl); |
1da177e4 LT |
1526 | if (dst == NULL) |
1527 | return; | |
1528 | ||
52479b62 | 1529 | err = xfrm_lookup(net, &dst, &fl, NULL, 0); |
e104411b | 1530 | if (err) |
1da177e4 | 1531 | return; |
1da177e4 LT |
1532 | |
1533 | rt = (struct rt6_info *) dst; | |
1534 | ||
1535 | if (rt->rt6i_flags & RTF_GATEWAY) { | |
1536 | ND_PRINTK2(KERN_WARNING | |
1537 | "ICMPv6 Redirect: destination is not a neighbour.\n"); | |
d73f0801 | 1538 | goto release; |
1da177e4 | 1539 | } |
d73f0801 IJ |
1540 | if (!xrlim_allow(dst, 1*HZ)) |
1541 | goto release; | |
1da177e4 LT |
1542 | |
1543 | if (dev->addr_len) { | |
1544 | read_lock_bh(&neigh->lock); | |
1545 | if (neigh->nud_state & NUD_VALID) { | |
1546 | memcpy(ha_buf, neigh->ha, dev->addr_len); | |
1547 | read_unlock_bh(&neigh->lock); | |
1548 | ha = ha_buf; | |
1549 | len += ndisc_opt_addr_space(dev); | |
1550 | } else | |
1551 | read_unlock_bh(&neigh->lock); | |
1552 | } | |
1553 | ||
1554 | rd_len = min_t(unsigned int, | |
1555 | IPV6_MIN_MTU-sizeof(struct ipv6hdr)-len, skb->len + 8); | |
1556 | rd_len &= ~0x7; | |
1557 | len += rd_len; | |
1558 | ||
d54a81d3 DM |
1559 | buff = sock_alloc_send_skb(sk, |
1560 | (MAX_HEADER + sizeof(struct ipv6hdr) + | |
f5184d26 | 1561 | len + LL_ALLOCATED_SPACE(dev)), |
1da177e4 LT |
1562 | 1, &err); |
1563 | if (buff == NULL) { | |
1564 | ND_PRINTK0(KERN_ERR | |
dae9de8e BH |
1565 | "ICMPv6 Redirect: %s() failed to allocate an skb, err=%d.\n", |
1566 | __func__, err); | |
d73f0801 | 1567 | goto release; |
1da177e4 LT |
1568 | } |
1569 | ||
1da177e4 | 1570 | skb_reserve(buff, LL_RESERVED_SPACE(dev)); |
0660e03f | 1571 | ip6_nd_hdr(sk, buff, dev, &saddr_buf, &ipv6_hdr(skb)->saddr, |
1da177e4 LT |
1572 | IPPROTO_ICMPV6, len); |
1573 | ||
27a884dc | 1574 | skb_set_transport_header(buff, skb_tail_pointer(buff) - buff->data); |
d10ba34b ACM |
1575 | skb_put(buff, len); |
1576 | icmph = icmp6_hdr(buff); | |
1da177e4 LT |
1577 | |
1578 | memset(icmph, 0, sizeof(struct icmp6hdr)); | |
1579 | icmph->icmp6_type = NDISC_REDIRECT; | |
1580 | ||
1581 | /* | |
1582 | * copy target and destination addresses | |
1583 | */ | |
1584 | ||
1585 | addrp = (struct in6_addr *)(icmph + 1); | |
1586 | ipv6_addr_copy(addrp, target); | |
1587 | addrp++; | |
0660e03f | 1588 | ipv6_addr_copy(addrp, &ipv6_hdr(skb)->daddr); |
1da177e4 LT |
1589 | |
1590 | opt = (u8*) (addrp + 1); | |
1591 | ||
1592 | /* | |
1593 | * include target_address option | |
1594 | */ | |
1595 | ||
1596 | if (ha) | |
1597 | opt = ndisc_fill_addr_option(opt, ND_OPT_TARGET_LL_ADDR, ha, | |
1598 | dev->addr_len, dev->type); | |
1599 | ||
1600 | /* | |
1601 | * build redirect option and copy skb over to the new packet. | |
1602 | */ | |
1603 | ||
1ab1457c | 1604 | memset(opt, 0, 8); |
1da177e4 LT |
1605 | *(opt++) = ND_OPT_REDIRECT_HDR; |
1606 | *(opt++) = (rd_len >> 3); | |
1607 | opt += 6; | |
1608 | ||
0660e03f | 1609 | memcpy(opt, ipv6_hdr(skb), rd_len - 8); |
1da177e4 | 1610 | |
0660e03f | 1611 | icmph->icmp6_cksum = csum_ipv6_magic(&saddr_buf, &ipv6_hdr(skb)->saddr, |
1da177e4 | 1612 | len, IPPROTO_ICMPV6, |
07f0757a | 1613 | csum_partial(icmph, len, 0)); |
1da177e4 | 1614 | |
adf30907 | 1615 | skb_dst_set(buff, dst); |
1da177e4 | 1616 | idev = in6_dev_get(dst->dev); |
edf391ff | 1617 | IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len); |
6e23ae2a PM |
1618 | err = NF_HOOK(PF_INET6, NF_INET_LOCAL_OUT, buff, NULL, dst->dev, |
1619 | dst_output); | |
1da177e4 | 1620 | if (!err) { |
5c5d244b | 1621 | ICMP6MSGOUT_INC_STATS(net, idev, NDISC_REDIRECT); |
a862f6a6 | 1622 | ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); |
1da177e4 LT |
1623 | } |
1624 | ||
1625 | if (likely(idev != NULL)) | |
1626 | in6_dev_put(idev); | |
d73f0801 IJ |
1627 | return; |
1628 | ||
1629 | release: | |
1630 | dst_release(dst); | |
1da177e4 LT |
1631 | } |
1632 | ||
1633 | static void pndisc_redo(struct sk_buff *skb) | |
1634 | { | |
140e26fc | 1635 | ndisc_recv_ns(skb); |
1da177e4 LT |
1636 | kfree_skb(skb); |
1637 | } | |
1638 | ||
1639 | int ndisc_rcv(struct sk_buff *skb) | |
1640 | { | |
1641 | struct nd_msg *msg; | |
1642 | ||
1643 | if (!pskb_may_pull(skb, skb->len)) | |
1644 | return 0; | |
1645 | ||
9c70220b | 1646 | msg = (struct nd_msg *)skb_transport_header(skb); |
1da177e4 | 1647 | |
9c70220b | 1648 | __skb_push(skb, skb->data - skb_transport_header(skb)); |
1da177e4 | 1649 | |
0660e03f | 1650 | if (ipv6_hdr(skb)->hop_limit != 255) { |
1da177e4 LT |
1651 | ND_PRINTK2(KERN_WARNING |
1652 | "ICMPv6 NDISC: invalid hop-limit: %d\n", | |
0660e03f | 1653 | ipv6_hdr(skb)->hop_limit); |
1da177e4 LT |
1654 | return 0; |
1655 | } | |
1656 | ||
1657 | if (msg->icmph.icmp6_code != 0) { | |
1ab1457c | 1658 | ND_PRINTK2(KERN_WARNING |
1da177e4 LT |
1659 | "ICMPv6 NDISC: invalid ICMPv6 code: %d\n", |
1660 | msg->icmph.icmp6_code); | |
1661 | return 0; | |
1662 | } | |
1663 | ||
a61bbcf2 PM |
1664 | memset(NEIGH_CB(skb), 0, sizeof(struct neighbour_cb)); |
1665 | ||
1da177e4 LT |
1666 | switch (msg->icmph.icmp6_type) { |
1667 | case NDISC_NEIGHBOUR_SOLICITATION: | |
1668 | ndisc_recv_ns(skb); | |
1669 | break; | |
1670 | ||
1671 | case NDISC_NEIGHBOUR_ADVERTISEMENT: | |
1672 | ndisc_recv_na(skb); | |
1673 | break; | |
1674 | ||
1675 | case NDISC_ROUTER_SOLICITATION: | |
1676 | ndisc_recv_rs(skb); | |
1677 | break; | |
1678 | ||
1679 | case NDISC_ROUTER_ADVERTISEMENT: | |
1680 | ndisc_router_discovery(skb); | |
1681 | break; | |
1682 | ||
1683 | case NDISC_REDIRECT: | |
1684 | ndisc_redirect_rcv(skb); | |
1685 | break; | |
3ff50b79 | 1686 | } |
1da177e4 LT |
1687 | |
1688 | return 0; | |
1689 | } | |
1690 | ||
1691 | static int ndisc_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1692 | { | |
1693 | struct net_device *dev = ptr; | |
c346dca1 | 1694 | struct net *net = dev_net(dev); |
1da177e4 LT |
1695 | |
1696 | switch (event) { | |
1697 | case NETDEV_CHANGEADDR: | |
1698 | neigh_changeaddr(&nd_tbl, dev); | |
5b7c931d | 1699 | fib6_run_gc(~0UL, net); |
1da177e4 LT |
1700 | break; |
1701 | case NETDEV_DOWN: | |
1702 | neigh_ifdown(&nd_tbl, dev); | |
5b7c931d | 1703 | fib6_run_gc(~0UL, net); |
1da177e4 LT |
1704 | break; |
1705 | default: | |
1706 | break; | |
1707 | } | |
1708 | ||
1709 | return NOTIFY_DONE; | |
1710 | } | |
1711 | ||
1712 | static struct notifier_block ndisc_netdev_notifier = { | |
1713 | .notifier_call = ndisc_netdev_event, | |
1714 | }; | |
1715 | ||
1716 | #ifdef CONFIG_SYSCTL | |
1717 | static void ndisc_warn_deprecated_sysctl(struct ctl_table *ctl, | |
1718 | const char *func, const char *dev_name) | |
1719 | { | |
1720 | static char warncomm[TASK_COMM_LEN]; | |
1721 | static int warned; | |
1722 | if (strcmp(warncomm, current->comm) && warned < 5) { | |
1723 | strcpy(warncomm, current->comm); | |
1724 | printk(KERN_WARNING | |
1725 | "process `%s' is using deprecated sysctl (%s) " | |
1726 | "net.ipv6.neigh.%s.%s; " | |
1727 | "Use net.ipv6.neigh.%s.%s_ms " | |
1728 | "instead.\n", | |
1729 | warncomm, func, | |
1730 | dev_name, ctl->procname, | |
1731 | dev_name, ctl->procname); | |
1732 | warned++; | |
1733 | } | |
1734 | } | |
1735 | ||
1736 | int ndisc_ifinfo_sysctl_change(struct ctl_table *ctl, int write, struct file * filp, void __user *buffer, size_t *lenp, loff_t *ppos) | |
1737 | { | |
1738 | struct net_device *dev = ctl->extra1; | |
1739 | struct inet6_dev *idev; | |
1740 | int ret; | |
1741 | ||
d12af679 EB |
1742 | if ((strcmp(ctl->procname, "retrans_time") == 0) || |
1743 | (strcmp(ctl->procname, "base_reachable_time") == 0)) | |
1da177e4 LT |
1744 | ndisc_warn_deprecated_sysctl(ctl, "syscall", dev ? dev->name : "default"); |
1745 | ||
d12af679 | 1746 | if (strcmp(ctl->procname, "retrans_time") == 0) |
1da177e4 | 1747 | ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos); |
d12af679 EB |
1748 | |
1749 | else if (strcmp(ctl->procname, "base_reachable_time") == 0) | |
1da177e4 LT |
1750 | ret = proc_dointvec_jiffies(ctl, write, |
1751 | filp, buffer, lenp, ppos); | |
d12af679 EB |
1752 | |
1753 | else if ((strcmp(ctl->procname, "retrans_time_ms") == 0) || | |
ad02ac14 | 1754 | (strcmp(ctl->procname, "base_reachable_time_ms") == 0)) |
1da177e4 LT |
1755 | ret = proc_dointvec_ms_jiffies(ctl, write, |
1756 | filp, buffer, lenp, ppos); | |
d12af679 | 1757 | else |
1da177e4 | 1758 | ret = -1; |
1da177e4 LT |
1759 | |
1760 | if (write && ret == 0 && dev && (idev = in6_dev_get(dev)) != NULL) { | |
d12af679 | 1761 | if (ctl->data == &idev->nd_parms->base_reachable_time) |
1da177e4 LT |
1762 | idev->nd_parms->reachable_time = neigh_rand_reach_time(idev->nd_parms->base_reachable_time); |
1763 | idev->tstamp = jiffies; | |
1764 | inet6_ifinfo_notify(RTM_NEWLINK, idev); | |
1765 | in6_dev_put(idev); | |
1766 | } | |
1767 | return ret; | |
1768 | } | |
1769 | ||
f221e726 AD |
1770 | int ndisc_ifinfo_sysctl_strategy(ctl_table *ctl, |
1771 | void __user *oldval, size_t __user *oldlenp, | |
0686caa3 | 1772 | void __user *newval, size_t newlen) |
1da177e4 LT |
1773 | { |
1774 | struct net_device *dev = ctl->extra1; | |
1775 | struct inet6_dev *idev; | |
1776 | int ret; | |
1777 | ||
1778 | if (ctl->ctl_name == NET_NEIGH_RETRANS_TIME || | |
1779 | ctl->ctl_name == NET_NEIGH_REACHABLE_TIME) | |
1780 | ndisc_warn_deprecated_sysctl(ctl, "procfs", dev ? dev->name : "default"); | |
1781 | ||
1782 | switch (ctl->ctl_name) { | |
1783 | case NET_NEIGH_REACHABLE_TIME: | |
f221e726 | 1784 | ret = sysctl_jiffies(ctl, oldval, oldlenp, newval, newlen); |
1da177e4 LT |
1785 | break; |
1786 | case NET_NEIGH_RETRANS_TIME_MS: | |
1787 | case NET_NEIGH_REACHABLE_TIME_MS: | |
f221e726 | 1788 | ret = sysctl_ms_jiffies(ctl, oldval, oldlenp, newval, newlen); |
1da177e4 LT |
1789 | break; |
1790 | default: | |
1791 | ret = 0; | |
1792 | } | |
1793 | ||
1794 | if (newval && newlen && ret > 0 && | |
1795 | dev && (idev = in6_dev_get(dev)) != NULL) { | |
1796 | if (ctl->ctl_name == NET_NEIGH_REACHABLE_TIME || | |
1797 | ctl->ctl_name == NET_NEIGH_REACHABLE_TIME_MS) | |
1798 | idev->nd_parms->reachable_time = neigh_rand_reach_time(idev->nd_parms->base_reachable_time); | |
1799 | idev->tstamp = jiffies; | |
1800 | inet6_ifinfo_notify(RTM_NEWLINK, idev); | |
1801 | in6_dev_put(idev); | |
1802 | } | |
1803 | ||
1804 | return ret; | |
1805 | } | |
1806 | ||
1807 | #endif | |
1808 | ||
1762f7e8 | 1809 | static int ndisc_net_init(struct net *net) |
1da177e4 LT |
1810 | { |
1811 | struct ipv6_pinfo *np; | |
1812 | struct sock *sk; | |
1ab1457c | 1813 | int err; |
1da177e4 | 1814 | |
1ed8516f DL |
1815 | err = inet_ctl_sock_create(&sk, PF_INET6, |
1816 | SOCK_RAW, IPPROTO_ICMPV6, net); | |
1da177e4 LT |
1817 | if (err < 0) { |
1818 | ND_PRINTK0(KERN_ERR | |
1ab1457c | 1819 | "ICMPv6 NDISC: Failed to initialize the control socket (err %d).\n", |
1da177e4 | 1820 | err); |
1da177e4 LT |
1821 | return err; |
1822 | } | |
1823 | ||
1ed8516f | 1824 | net->ipv6.ndisc_sk = sk; |
1762f7e8 | 1825 | |
1da177e4 | 1826 | np = inet6_sk(sk); |
1da177e4 LT |
1827 | np->hop_limit = 255; |
1828 | /* Do not loopback ndisc messages */ | |
1829 | np->mc_loop = 0; | |
1da177e4 | 1830 | |
1762f7e8 DL |
1831 | return 0; |
1832 | } | |
1833 | ||
1834 | static void ndisc_net_exit(struct net *net) | |
1835 | { | |
1ed8516f | 1836 | inet_ctl_sock_destroy(net->ipv6.ndisc_sk); |
1762f7e8 DL |
1837 | } |
1838 | ||
1839 | static struct pernet_operations ndisc_net_ops = { | |
1840 | .init = ndisc_net_init, | |
1841 | .exit = ndisc_net_exit, | |
1842 | }; | |
1843 | ||
1844 | int __init ndisc_init(void) | |
1845 | { | |
1846 | int err; | |
1847 | ||
1848 | err = register_pernet_subsys(&ndisc_net_ops); | |
1849 | if (err) | |
1850 | return err; | |
1ab1457c YH |
1851 | /* |
1852 | * Initialize the neighbour table | |
1853 | */ | |
1da177e4 LT |
1854 | neigh_table_init(&nd_tbl); |
1855 | ||
1856 | #ifdef CONFIG_SYSCTL | |
1762f7e8 DL |
1857 | err = neigh_sysctl_register(NULL, &nd_tbl.parms, NET_IPV6, |
1858 | NET_IPV6_NEIGH, "ipv6", | |
1859 | &ndisc_ifinfo_sysctl_change, | |
1860 | &ndisc_ifinfo_sysctl_strategy); | |
1861 | if (err) | |
1862 | goto out_unregister_pernet; | |
1da177e4 | 1863 | #endif |
1762f7e8 DL |
1864 | err = register_netdevice_notifier(&ndisc_netdev_notifier); |
1865 | if (err) | |
1866 | goto out_unregister_sysctl; | |
1867 | out: | |
1868 | return err; | |
1da177e4 | 1869 | |
1762f7e8 DL |
1870 | out_unregister_sysctl: |
1871 | #ifdef CONFIG_SYSCTL | |
1872 | neigh_sysctl_unregister(&nd_tbl.parms); | |
1873 | out_unregister_pernet: | |
1874 | #endif | |
1875 | unregister_pernet_subsys(&ndisc_net_ops); | |
1876 | goto out; | |
1da177e4 LT |
1877 | } |
1878 | ||
1879 | void ndisc_cleanup(void) | |
1880 | { | |
36f73d0c | 1881 | unregister_netdevice_notifier(&ndisc_netdev_notifier); |
1da177e4 LT |
1882 | #ifdef CONFIG_SYSCTL |
1883 | neigh_sysctl_unregister(&nd_tbl.parms); | |
1884 | #endif | |
1885 | neigh_table_clear(&nd_tbl); | |
1762f7e8 | 1886 | unregister_pernet_subsys(&ndisc_net_ops); |
1da177e4 | 1887 | } |