Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Neighbour Discovery for IPv6 | |
1ab1457c | 3 | * Linux INET6 implementation |
1da177e4 LT |
4 | * |
5 | * Authors: | |
1ab1457c | 6 | * Pedro Roque <roque@di.fc.ul.pt> |
1da177e4 LT |
7 | * Mike Shaver <shaver@ingenia.com> |
8 | * | |
9 | * This program is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU General Public License | |
11 | * as published by the Free Software Foundation; either version | |
12 | * 2 of the License, or (at your option) any later version. | |
13 | */ | |
14 | ||
15 | /* | |
16 | * Changes: | |
17 | * | |
31910575 PY |
18 | * Pierre Ynard : export userland ND options |
19 | * through netlink (RDNSS support) | |
1da177e4 LT |
20 | * Lars Fenneberg : fixed MTU setting on receipt |
21 | * of an RA. | |
1da177e4 LT |
22 | * Janos Farkas : kmalloc failure checks |
23 | * Alexey Kuznetsov : state machine reworked | |
24 | * and moved to net/core. | |
25 | * Pekka Savola : RFC2461 validation | |
26 | * YOSHIFUJI Hideaki @USAGI : Verify ND options properly | |
27 | */ | |
28 | ||
29 | /* Set to 3 to get tracing... */ | |
30 | #define ND_DEBUG 1 | |
31 | ||
32 | #define ND_PRINTK(fmt, args...) do { if (net_ratelimit()) { printk(fmt, ## args); } } while(0) | |
33 | #define ND_NOPRINTK(x...) do { ; } while(0) | |
34 | #define ND_PRINTK0 ND_PRINTK | |
35 | #define ND_PRINTK1 ND_NOPRINTK | |
36 | #define ND_PRINTK2 ND_NOPRINTK | |
37 | #define ND_PRINTK3 ND_NOPRINTK | |
38 | #if ND_DEBUG >= 1 | |
39 | #undef ND_PRINTK1 | |
40 | #define ND_PRINTK1 ND_PRINTK | |
41 | #endif | |
42 | #if ND_DEBUG >= 2 | |
43 | #undef ND_PRINTK2 | |
44 | #define ND_PRINTK2 ND_PRINTK | |
45 | #endif | |
46 | #if ND_DEBUG >= 3 | |
47 | #undef ND_PRINTK3 | |
48 | #define ND_PRINTK3 ND_PRINTK | |
49 | #endif | |
50 | ||
51 | #include <linux/module.h> | |
1da177e4 LT |
52 | #include <linux/errno.h> |
53 | #include <linux/types.h> | |
54 | #include <linux/socket.h> | |
55 | #include <linux/sockios.h> | |
56 | #include <linux/sched.h> | |
57 | #include <linux/net.h> | |
58 | #include <linux/in6.h> | |
59 | #include <linux/route.h> | |
60 | #include <linux/init.h> | |
61 | #include <linux/rcupdate.h> | |
5a0e3ad6 | 62 | #include <linux/slab.h> |
1da177e4 LT |
63 | #ifdef CONFIG_SYSCTL |
64 | #include <linux/sysctl.h> | |
65 | #endif | |
66 | ||
1823730f | 67 | #include <linux/if_addr.h> |
1da177e4 LT |
68 | #include <linux/if_arp.h> |
69 | #include <linux/ipv6.h> | |
70 | #include <linux/icmpv6.h> | |
71 | #include <linux/jhash.h> | |
72 | ||
73 | #include <net/sock.h> | |
74 | #include <net/snmp.h> | |
75 | ||
76 | #include <net/ipv6.h> | |
77 | #include <net/protocol.h> | |
78 | #include <net/ndisc.h> | |
79 | #include <net/ip6_route.h> | |
80 | #include <net/addrconf.h> | |
81 | #include <net/icmp.h> | |
82 | ||
31910575 PY |
83 | #include <net/netlink.h> |
84 | #include <linux/rtnetlink.h> | |
85 | ||
1da177e4 LT |
86 | #include <net/flow.h> |
87 | #include <net/ip6_checksum.h> | |
1ed8516f | 88 | #include <net/inet_common.h> |
1da177e4 LT |
89 | #include <linux/proc_fs.h> |
90 | ||
91 | #include <linux/netfilter.h> | |
92 | #include <linux/netfilter_ipv6.h> | |
93 | ||
d6bf7817 ED |
94 | static u32 ndisc_hash(const void *pkey, |
95 | const struct net_device *dev, | |
96 | __u32 rnd); | |
1da177e4 LT |
97 | static int ndisc_constructor(struct neighbour *neigh); |
98 | static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb); | |
99 | static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb); | |
100 | static int pndisc_constructor(struct pneigh_entry *n); | |
101 | static void pndisc_destructor(struct pneigh_entry *n); | |
102 | static void pndisc_redo(struct sk_buff *skb); | |
103 | ||
89d69d2b | 104 | static const struct neigh_ops ndisc_generic_ops = { |
1da177e4 LT |
105 | .family = AF_INET6, |
106 | .solicit = ndisc_solicit, | |
107 | .error_report = ndisc_error_report, | |
108 | .output = neigh_resolve_output, | |
109 | .connected_output = neigh_connected_output, | |
110 | .hh_output = dev_queue_xmit, | |
111 | .queue_xmit = dev_queue_xmit, | |
112 | }; | |
113 | ||
89d69d2b | 114 | static const struct neigh_ops ndisc_hh_ops = { |
1da177e4 LT |
115 | .family = AF_INET6, |
116 | .solicit = ndisc_solicit, | |
117 | .error_report = ndisc_error_report, | |
118 | .output = neigh_resolve_output, | |
119 | .connected_output = neigh_resolve_output, | |
120 | .hh_output = dev_queue_xmit, | |
121 | .queue_xmit = dev_queue_xmit, | |
122 | }; | |
123 | ||
124 | ||
89d69d2b | 125 | static const struct neigh_ops ndisc_direct_ops = { |
1da177e4 LT |
126 | .family = AF_INET6, |
127 | .output = dev_queue_xmit, | |
128 | .connected_output = dev_queue_xmit, | |
129 | .hh_output = dev_queue_xmit, | |
130 | .queue_xmit = dev_queue_xmit, | |
131 | }; | |
132 | ||
133 | struct neigh_table nd_tbl = { | |
134 | .family = AF_INET6, | |
135 | .entry_size = sizeof(struct neighbour) + sizeof(struct in6_addr), | |
136 | .key_len = sizeof(struct in6_addr), | |
137 | .hash = ndisc_hash, | |
138 | .constructor = ndisc_constructor, | |
139 | .pconstructor = pndisc_constructor, | |
140 | .pdestructor = pndisc_destructor, | |
141 | .proxy_redo = pndisc_redo, | |
142 | .id = "ndisc_cache", | |
143 | .parms = { | |
144 | .tbl = &nd_tbl, | |
145 | .base_reachable_time = 30 * HZ, | |
146 | .retrans_time = 1 * HZ, | |
147 | .gc_staletime = 60 * HZ, | |
148 | .reachable_time = 30 * HZ, | |
149 | .delay_probe_time = 5 * HZ, | |
150 | .queue_len = 3, | |
151 | .ucast_probes = 3, | |
152 | .mcast_probes = 3, | |
153 | .anycast_delay = 1 * HZ, | |
154 | .proxy_delay = (8 * HZ) / 10, | |
155 | .proxy_qlen = 64, | |
156 | }, | |
157 | .gc_interval = 30 * HZ, | |
158 | .gc_thresh1 = 128, | |
159 | .gc_thresh2 = 512, | |
160 | .gc_thresh3 = 1024, | |
161 | }; | |
162 | ||
163 | /* ND options */ | |
164 | struct ndisc_options { | |
70ceb4f5 YH |
165 | struct nd_opt_hdr *nd_opt_array[__ND_OPT_ARRAY_MAX]; |
166 | #ifdef CONFIG_IPV6_ROUTE_INFO | |
167 | struct nd_opt_hdr *nd_opts_ri; | |
168 | struct nd_opt_hdr *nd_opts_ri_end; | |
169 | #endif | |
31910575 PY |
170 | struct nd_opt_hdr *nd_useropts; |
171 | struct nd_opt_hdr *nd_useropts_end; | |
1da177e4 LT |
172 | }; |
173 | ||
174 | #define nd_opts_src_lladdr nd_opt_array[ND_OPT_SOURCE_LL_ADDR] | |
175 | #define nd_opts_tgt_lladdr nd_opt_array[ND_OPT_TARGET_LL_ADDR] | |
176 | #define nd_opts_pi nd_opt_array[ND_OPT_PREFIX_INFO] | |
177 | #define nd_opts_pi_end nd_opt_array[__ND_OPT_PREFIX_INFO_END] | |
178 | #define nd_opts_rh nd_opt_array[ND_OPT_REDIRECT_HDR] | |
179 | #define nd_opts_mtu nd_opt_array[ND_OPT_MTU] | |
180 | ||
181 | #define NDISC_OPT_SPACE(len) (((len)+2+7)&~7) | |
182 | ||
183 | /* | |
184 | * Return the padding between the option length and the start of the | |
185 | * link addr. Currently only IP-over-InfiniBand needs this, although | |
186 | * if RFC 3831 IPv6-over-Fibre Channel is ever implemented it may | |
187 | * also need a pad of 2. | |
188 | */ | |
189 | static int ndisc_addr_option_pad(unsigned short type) | |
190 | { | |
191 | switch (type) { | |
192 | case ARPHRD_INFINIBAND: return 2; | |
193 | default: return 0; | |
194 | } | |
195 | } | |
196 | ||
197 | static inline int ndisc_opt_addr_space(struct net_device *dev) | |
198 | { | |
199 | return NDISC_OPT_SPACE(dev->addr_len + ndisc_addr_option_pad(dev->type)); | |
200 | } | |
201 | ||
202 | static u8 *ndisc_fill_addr_option(u8 *opt, int type, void *data, int data_len, | |
203 | unsigned short addr_type) | |
204 | { | |
205 | int space = NDISC_OPT_SPACE(data_len); | |
206 | int pad = ndisc_addr_option_pad(addr_type); | |
207 | ||
208 | opt[0] = type; | |
209 | opt[1] = space>>3; | |
210 | ||
211 | memset(opt + 2, 0, pad); | |
212 | opt += pad; | |
213 | space -= pad; | |
214 | ||
215 | memcpy(opt+2, data, data_len); | |
216 | data_len += 2; | |
217 | opt += data_len; | |
218 | if ((space -= data_len) > 0) | |
219 | memset(opt, 0, space); | |
220 | return opt + space; | |
221 | } | |
222 | ||
223 | static struct nd_opt_hdr *ndisc_next_option(struct nd_opt_hdr *cur, | |
224 | struct nd_opt_hdr *end) | |
225 | { | |
226 | int type; | |
227 | if (!cur || !end || cur >= end) | |
228 | return NULL; | |
229 | type = cur->nd_opt_type; | |
230 | do { | |
231 | cur = ((void *)cur) + (cur->nd_opt_len << 3); | |
232 | } while(cur < end && cur->nd_opt_type != type); | |
a02cec21 | 233 | return cur <= end && cur->nd_opt_type == type ? cur : NULL; |
1da177e4 LT |
234 | } |
235 | ||
31910575 PY |
236 | static inline int ndisc_is_useropt(struct nd_opt_hdr *opt) |
237 | { | |
a02cec21 | 238 | return opt->nd_opt_type == ND_OPT_RDNSS; |
31910575 PY |
239 | } |
240 | ||
241 | static struct nd_opt_hdr *ndisc_next_useropt(struct nd_opt_hdr *cur, | |
242 | struct nd_opt_hdr *end) | |
243 | { | |
244 | if (!cur || !end || cur >= end) | |
245 | return NULL; | |
246 | do { | |
247 | cur = ((void *)cur) + (cur->nd_opt_len << 3); | |
248 | } while(cur < end && !ndisc_is_useropt(cur)); | |
a02cec21 | 249 | return cur <= end && ndisc_is_useropt(cur) ? cur : NULL; |
31910575 PY |
250 | } |
251 | ||
1da177e4 LT |
252 | static struct ndisc_options *ndisc_parse_options(u8 *opt, int opt_len, |
253 | struct ndisc_options *ndopts) | |
254 | { | |
255 | struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)opt; | |
256 | ||
257 | if (!nd_opt || opt_len < 0 || !ndopts) | |
258 | return NULL; | |
259 | memset(ndopts, 0, sizeof(*ndopts)); | |
260 | while (opt_len) { | |
261 | int l; | |
262 | if (opt_len < sizeof(struct nd_opt_hdr)) | |
263 | return NULL; | |
264 | l = nd_opt->nd_opt_len << 3; | |
265 | if (opt_len < l || l == 0) | |
266 | return NULL; | |
267 | switch (nd_opt->nd_opt_type) { | |
268 | case ND_OPT_SOURCE_LL_ADDR: | |
269 | case ND_OPT_TARGET_LL_ADDR: | |
270 | case ND_OPT_MTU: | |
271 | case ND_OPT_REDIRECT_HDR: | |
272 | if (ndopts->nd_opt_array[nd_opt->nd_opt_type]) { | |
273 | ND_PRINTK2(KERN_WARNING | |
274 | "%s(): duplicated ND6 option found: type=%d\n", | |
0dc47877 | 275 | __func__, |
1da177e4 LT |
276 | nd_opt->nd_opt_type); |
277 | } else { | |
278 | ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt; | |
279 | } | |
280 | break; | |
281 | case ND_OPT_PREFIX_INFO: | |
282 | ndopts->nd_opts_pi_end = nd_opt; | |
cfcabdcc | 283 | if (!ndopts->nd_opt_array[nd_opt->nd_opt_type]) |
1da177e4 LT |
284 | ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt; |
285 | break; | |
70ceb4f5 YH |
286 | #ifdef CONFIG_IPV6_ROUTE_INFO |
287 | case ND_OPT_ROUTE_INFO: | |
288 | ndopts->nd_opts_ri_end = nd_opt; | |
289 | if (!ndopts->nd_opts_ri) | |
290 | ndopts->nd_opts_ri = nd_opt; | |
291 | break; | |
292 | #endif | |
1da177e4 | 293 | default: |
31910575 PY |
294 | if (ndisc_is_useropt(nd_opt)) { |
295 | ndopts->nd_useropts_end = nd_opt; | |
296 | if (!ndopts->nd_useropts) | |
297 | ndopts->nd_useropts = nd_opt; | |
298 | } else { | |
299 | /* | |
300 | * Unknown options must be silently ignored, | |
301 | * to accommodate future extension to the | |
302 | * protocol. | |
303 | */ | |
304 | ND_PRINTK2(KERN_NOTICE | |
305 | "%s(): ignored unsupported option; type=%d, len=%d\n", | |
0dc47877 | 306 | __func__, |
31910575 PY |
307 | nd_opt->nd_opt_type, nd_opt->nd_opt_len); |
308 | } | |
1da177e4 LT |
309 | } |
310 | opt_len -= l; | |
311 | nd_opt = ((void *)nd_opt) + l; | |
312 | } | |
313 | return ndopts; | |
314 | } | |
315 | ||
316 | static inline u8 *ndisc_opt_addr_data(struct nd_opt_hdr *p, | |
317 | struct net_device *dev) | |
318 | { | |
319 | u8 *lladdr = (u8 *)(p + 1); | |
320 | int lladdrlen = p->nd_opt_len << 3; | |
321 | int prepad = ndisc_addr_option_pad(dev->type); | |
322 | if (lladdrlen != NDISC_OPT_SPACE(dev->addr_len + prepad)) | |
323 | return NULL; | |
a02cec21 | 324 | return lladdr + prepad; |
1da177e4 LT |
325 | } |
326 | ||
327 | int ndisc_mc_map(struct in6_addr *addr, char *buf, struct net_device *dev, int dir) | |
328 | { | |
329 | switch (dev->type) { | |
330 | case ARPHRD_ETHER: | |
331 | case ARPHRD_IEEE802: /* Not sure. Check it later. --ANK */ | |
332 | case ARPHRD_FDDI: | |
333 | ipv6_eth_mc_map(addr, buf); | |
334 | return 0; | |
335 | case ARPHRD_IEEE802_TR: | |
336 | ipv6_tr_mc_map(addr,buf); | |
337 | return 0; | |
338 | case ARPHRD_ARCNET: | |
339 | ipv6_arcnet_mc_map(addr, buf); | |
340 | return 0; | |
341 | case ARPHRD_INFINIBAND: | |
a9e527e3 | 342 | ipv6_ib_mc_map(addr, dev->broadcast, buf); |
1da177e4 LT |
343 | return 0; |
344 | default: | |
345 | if (dir) { | |
346 | memcpy(buf, dev->broadcast, dev->addr_len); | |
347 | return 0; | |
348 | } | |
349 | } | |
350 | return -EINVAL; | |
351 | } | |
352 | ||
7159039a YH |
353 | EXPORT_SYMBOL(ndisc_mc_map); |
354 | ||
d6bf7817 ED |
355 | static u32 ndisc_hash(const void *pkey, |
356 | const struct net_device *dev, | |
357 | __u32 hash_rnd) | |
1da177e4 LT |
358 | { |
359 | const u32 *p32 = pkey; | |
360 | u32 addr_hash, i; | |
361 | ||
362 | addr_hash = 0; | |
363 | for (i = 0; i < (sizeof(struct in6_addr) / sizeof(u32)); i++) | |
364 | addr_hash ^= *p32++; | |
365 | ||
d6bf7817 | 366 | return jhash_2words(addr_hash, dev->ifindex, hash_rnd); |
1da177e4 LT |
367 | } |
368 | ||
369 | static int ndisc_constructor(struct neighbour *neigh) | |
370 | { | |
371 | struct in6_addr *addr = (struct in6_addr*)&neigh->primary_key; | |
372 | struct net_device *dev = neigh->dev; | |
373 | struct inet6_dev *in6_dev; | |
374 | struct neigh_parms *parms; | |
375 | int is_multicast = ipv6_addr_is_multicast(addr); | |
376 | ||
377 | rcu_read_lock(); | |
378 | in6_dev = in6_dev_get(dev); | |
379 | if (in6_dev == NULL) { | |
380 | rcu_read_unlock(); | |
381 | return -EINVAL; | |
382 | } | |
383 | ||
384 | parms = in6_dev->nd_parms; | |
385 | __neigh_parms_put(neigh->parms); | |
386 | neigh->parms = neigh_parms_clone(parms); | |
387 | rcu_read_unlock(); | |
388 | ||
389 | neigh->type = is_multicast ? RTN_MULTICAST : RTN_UNICAST; | |
3b04ddde | 390 | if (!dev->header_ops) { |
1da177e4 LT |
391 | neigh->nud_state = NUD_NOARP; |
392 | neigh->ops = &ndisc_direct_ops; | |
393 | neigh->output = neigh->ops->queue_xmit; | |
394 | } else { | |
395 | if (is_multicast) { | |
396 | neigh->nud_state = NUD_NOARP; | |
397 | ndisc_mc_map(addr, neigh->ha, dev, 1); | |
398 | } else if (dev->flags&(IFF_NOARP|IFF_LOOPBACK)) { | |
399 | neigh->nud_state = NUD_NOARP; | |
400 | memcpy(neigh->ha, dev->dev_addr, dev->addr_len); | |
401 | if (dev->flags&IFF_LOOPBACK) | |
402 | neigh->type = RTN_LOCAL; | |
403 | } else if (dev->flags&IFF_POINTOPOINT) { | |
404 | neigh->nud_state = NUD_NOARP; | |
405 | memcpy(neigh->ha, dev->broadcast, dev->addr_len); | |
406 | } | |
3b04ddde | 407 | if (dev->header_ops->cache) |
1da177e4 LT |
408 | neigh->ops = &ndisc_hh_ops; |
409 | else | |
410 | neigh->ops = &ndisc_generic_ops; | |
411 | if (neigh->nud_state&NUD_VALID) | |
412 | neigh->output = neigh->ops->connected_output; | |
413 | else | |
414 | neigh->output = neigh->ops->output; | |
415 | } | |
416 | in6_dev_put(in6_dev); | |
417 | return 0; | |
418 | } | |
419 | ||
420 | static int pndisc_constructor(struct pneigh_entry *n) | |
421 | { | |
422 | struct in6_addr *addr = (struct in6_addr*)&n->key; | |
423 | struct in6_addr maddr; | |
424 | struct net_device *dev = n->dev; | |
425 | ||
426 | if (dev == NULL || __in6_dev_get(dev) == NULL) | |
427 | return -EINVAL; | |
428 | addrconf_addr_solict_mult(addr, &maddr); | |
429 | ipv6_dev_mc_inc(dev, &maddr); | |
430 | return 0; | |
431 | } | |
432 | ||
433 | static void pndisc_destructor(struct pneigh_entry *n) | |
434 | { | |
435 | struct in6_addr *addr = (struct in6_addr*)&n->key; | |
436 | struct in6_addr maddr; | |
437 | struct net_device *dev = n->dev; | |
438 | ||
439 | if (dev == NULL || __in6_dev_get(dev) == NULL) | |
440 | return; | |
441 | addrconf_addr_solict_mult(addr, &maddr); | |
442 | ipv6_dev_mc_dec(dev, &maddr); | |
443 | } | |
444 | ||
305d552a BH |
445 | struct sk_buff *ndisc_build_skb(struct net_device *dev, |
446 | const struct in6_addr *daddr, | |
447 | const struct in6_addr *saddr, | |
448 | struct icmp6hdr *icmp6h, | |
449 | const struct in6_addr *target, | |
450 | int llinfo) | |
1da177e4 | 451 | { |
c346dca1 | 452 | struct net *net = dev_net(dev); |
1762f7e8 | 453 | struct sock *sk = net->ipv6.ndisc_sk; |
1ab1457c | 454 | struct sk_buff *skb; |
e1ec7842 | 455 | struct icmp6hdr *hdr; |
e1ec7842 | 456 | int len; |
1da177e4 | 457 | int err; |
305d552a | 458 | u8 *opt; |
1da177e4 | 459 | |
e1ec7842 YH |
460 | if (!dev->addr_len) |
461 | llinfo = 0; | |
462 | ||
463 | len = sizeof(struct icmp6hdr) + (target ? sizeof(*target) : 0); | |
464 | if (llinfo) | |
465 | len += ndisc_opt_addr_space(dev); | |
1da177e4 | 466 | |
d54a81d3 DM |
467 | skb = sock_alloc_send_skb(sk, |
468 | (MAX_HEADER + sizeof(struct ipv6hdr) + | |
f5184d26 | 469 | len + LL_ALLOCATED_SPACE(dev)), |
1da177e4 | 470 | 1, &err); |
e1ec7842 | 471 | if (!skb) { |
1da177e4 | 472 | ND_PRINTK0(KERN_ERR |
dae9de8e BH |
473 | "ICMPv6 ND: %s() failed to allocate an skb, err=%d.\n", |
474 | __func__, err); | |
305d552a | 475 | return NULL; |
1da177e4 LT |
476 | } |
477 | ||
478 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); | |
e1ec7842 | 479 | ip6_nd_hdr(sk, skb, dev, saddr, daddr, IPPROTO_ICMPV6, len); |
1da177e4 | 480 | |
27a884dc | 481 | skb->transport_header = skb->tail; |
d10ba34b | 482 | skb_put(skb, len); |
1da177e4 | 483 | |
e1ec7842 YH |
484 | hdr = (struct icmp6hdr *)skb_transport_header(skb); |
485 | memcpy(hdr, icmp6h, sizeof(*hdr)); | |
1da177e4 | 486 | |
e1ec7842 YH |
487 | opt = skb_transport_header(skb) + sizeof(struct icmp6hdr); |
488 | if (target) { | |
489 | ipv6_addr_copy((struct in6_addr *)opt, target); | |
490 | opt += sizeof(*target); | |
491 | } | |
1da177e4 | 492 | |
e1ec7842 YH |
493 | if (llinfo) |
494 | ndisc_fill_addr_option(opt, llinfo, dev->dev_addr, | |
1da177e4 LT |
495 | dev->addr_len, dev->type); |
496 | ||
e1ec7842 YH |
497 | hdr->icmp6_cksum = csum_ipv6_magic(saddr, daddr, len, |
498 | IPPROTO_ICMPV6, | |
07f0757a | 499 | csum_partial(hdr, |
e1ec7842 | 500 | len, 0)); |
1da177e4 | 501 | |
305d552a BH |
502 | return skb; |
503 | } | |
504 | ||
505 | EXPORT_SYMBOL(ndisc_build_skb); | |
506 | ||
507 | void ndisc_send_skb(struct sk_buff *skb, | |
508 | struct net_device *dev, | |
509 | struct neighbour *neigh, | |
510 | const struct in6_addr *daddr, | |
511 | const struct in6_addr *saddr, | |
512 | struct icmp6hdr *icmp6h) | |
513 | { | |
514 | struct flowi fl; | |
515 | struct dst_entry *dst; | |
516 | struct net *net = dev_net(dev); | |
517 | struct sock *sk = net->ipv6.ndisc_sk; | |
518 | struct inet6_dev *idev; | |
519 | int err; | |
520 | u8 type; | |
521 | ||
522 | type = icmp6h->icmp6_type; | |
523 | ||
524 | icmpv6_flow_init(sk, &fl, type, saddr, daddr, dev->ifindex); | |
525 | ||
526 | dst = icmp6_dst_alloc(dev, neigh, daddr); | |
527 | if (!dst) { | |
528 | kfree_skb(skb); | |
529 | return; | |
530 | } | |
531 | ||
52479b62 | 532 | err = xfrm_lookup(net, &dst, &fl, NULL, 0); |
305d552a BH |
533 | if (err < 0) { |
534 | kfree_skb(skb); | |
535 | return; | |
536 | } | |
537 | ||
adf30907 | 538 | skb_dst_set(skb, dst); |
e1ec7842 | 539 | |
1da177e4 | 540 | idev = in6_dev_get(dst->dev); |
edf391ff | 541 | IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len); |
e1ec7842 | 542 | |
b2e0b385 | 543 | err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, dst->dev, |
6e23ae2a | 544 | dst_output); |
1da177e4 | 545 | if (!err) { |
5c5d244b | 546 | ICMP6MSGOUT_INC_STATS(net, idev, type); |
a862f6a6 | 547 | ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); |
1da177e4 LT |
548 | } |
549 | ||
550 | if (likely(idev != NULL)) | |
551 | in6_dev_put(idev); | |
1ab1457c | 552 | } |
1da177e4 | 553 | |
305d552a BH |
554 | EXPORT_SYMBOL(ndisc_send_skb); |
555 | ||
556 | /* | |
557 | * Send a Neighbour Discover packet | |
558 | */ | |
559 | static void __ndisc_send(struct net_device *dev, | |
560 | struct neighbour *neigh, | |
561 | const struct in6_addr *daddr, | |
562 | const struct in6_addr *saddr, | |
563 | struct icmp6hdr *icmp6h, const struct in6_addr *target, | |
564 | int llinfo) | |
565 | { | |
566 | struct sk_buff *skb; | |
567 | ||
568 | skb = ndisc_build_skb(dev, daddr, saddr, icmp6h, target, llinfo); | |
569 | if (!skb) | |
570 | return; | |
571 | ||
572 | ndisc_send_skb(skb, dev, neigh, daddr, saddr, icmp6h); | |
573 | } | |
574 | ||
e1ec7842 | 575 | static void ndisc_send_na(struct net_device *dev, struct neighbour *neigh, |
9acd9f3a YH |
576 | const struct in6_addr *daddr, |
577 | const struct in6_addr *solicited_addr, | |
578 | int router, int solicited, int override, int inc_opt) | |
e1ec7842 YH |
579 | { |
580 | struct in6_addr tmpaddr; | |
581 | struct inet6_ifaddr *ifp; | |
9acd9f3a | 582 | const struct in6_addr *src_addr; |
e1ec7842 YH |
583 | struct icmp6hdr icmp6h = { |
584 | .icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT, | |
585 | }; | |
586 | ||
587 | /* for anycast or proxy, solicited_addr != src_addr */ | |
c346dca1 | 588 | ifp = ipv6_get_ifaddr(dev_net(dev), solicited_addr, dev, 1); |
e1ec7842 YH |
589 | if (ifp) { |
590 | src_addr = solicited_addr; | |
591 | if (ifp->flags & IFA_F_OPTIMISTIC) | |
592 | override = 0; | |
9f888160 | 593 | inc_opt |= ifp->idev->cnf.force_tllao; |
e1ec7842 YH |
594 | in6_ifa_put(ifp); |
595 | } else { | |
191cd582 | 596 | if (ipv6_dev_get_saddr(dev_net(dev), dev, daddr, |
c346dca1 | 597 | inet6_sk(dev_net(dev)->ipv6.ndisc_sk)->srcprefs, |
7cbca67c | 598 | &tmpaddr)) |
e1ec7842 YH |
599 | return; |
600 | src_addr = &tmpaddr; | |
601 | } | |
602 | ||
603 | icmp6h.icmp6_router = router; | |
604 | icmp6h.icmp6_solicited = solicited; | |
605 | icmp6h.icmp6_override = override; | |
606 | ||
607 | __ndisc_send(dev, neigh, daddr, src_addr, | |
608 | &icmp6h, solicited_addr, | |
14878f75 | 609 | inc_opt ? ND_OPT_TARGET_LL_ADDR : 0); |
e1ec7842 YH |
610 | } |
611 | ||
1da177e4 | 612 | void ndisc_send_ns(struct net_device *dev, struct neighbour *neigh, |
9acd9f3a YH |
613 | const struct in6_addr *solicit, |
614 | const struct in6_addr *daddr, const struct in6_addr *saddr) | |
1da177e4 | 615 | { |
1da177e4 | 616 | struct in6_addr addr_buf; |
e1ec7842 YH |
617 | struct icmp6hdr icmp6h = { |
618 | .icmp6_type = NDISC_NEIGHBOUR_SOLICITATION, | |
619 | }; | |
1da177e4 LT |
620 | |
621 | if (saddr == NULL) { | |
95c385b4 NH |
622 | if (ipv6_get_lladdr(dev, &addr_buf, |
623 | (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC))) | |
1da177e4 LT |
624 | return; |
625 | saddr = &addr_buf; | |
626 | } | |
627 | ||
e1ec7842 YH |
628 | __ndisc_send(dev, neigh, daddr, saddr, |
629 | &icmp6h, solicit, | |
14878f75 | 630 | !ipv6_addr_any(saddr) ? ND_OPT_SOURCE_LL_ADDR : 0); |
1da177e4 LT |
631 | } |
632 | ||
9acd9f3a YH |
633 | void ndisc_send_rs(struct net_device *dev, const struct in6_addr *saddr, |
634 | const struct in6_addr *daddr) | |
1da177e4 | 635 | { |
e1ec7842 YH |
636 | struct icmp6hdr icmp6h = { |
637 | .icmp6_type = NDISC_ROUTER_SOLICITATION, | |
638 | }; | |
95c385b4 | 639 | int send_sllao = dev->addr_len; |
95c385b4 NH |
640 | |
641 | #ifdef CONFIG_IPV6_OPTIMISTIC_DAD | |
642 | /* | |
643 | * According to section 2.2 of RFC 4429, we must not | |
644 | * send router solicitations with a sllao from | |
645 | * optimistic addresses, but we may send the solicitation | |
646 | * if we don't include the sllao. So here we check | |
647 | * if our address is optimistic, and if so, we | |
bea85195 | 648 | * suppress the inclusion of the sllao. |
95c385b4 NH |
649 | */ |
650 | if (send_sllao) { | |
c346dca1 | 651 | struct inet6_ifaddr *ifp = ipv6_get_ifaddr(dev_net(dev), saddr, |
1cab3da6 | 652 | dev, 1); |
95c385b4 NH |
653 | if (ifp) { |
654 | if (ifp->flags & IFA_F_OPTIMISTIC) { | |
ca043569 | 655 | send_sllao = 0; |
95c385b4 | 656 | } |
ca043569 | 657 | in6_ifa_put(ifp); |
95c385b4 NH |
658 | } else { |
659 | send_sllao = 0; | |
660 | } | |
661 | } | |
662 | #endif | |
e1ec7842 YH |
663 | __ndisc_send(dev, NULL, daddr, saddr, |
664 | &icmp6h, NULL, | |
14878f75 | 665 | send_sllao ? ND_OPT_SOURCE_LL_ADDR : 0); |
1da177e4 | 666 | } |
1ab1457c | 667 | |
1da177e4 LT |
668 | |
669 | static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb) | |
670 | { | |
671 | /* | |
672 | * "The sender MUST return an ICMP | |
673 | * destination unreachable" | |
674 | */ | |
675 | dst_link_failure(skb); | |
676 | kfree_skb(skb); | |
677 | } | |
678 | ||
679 | /* Called with locked neigh: either read or both */ | |
680 | ||
681 | static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb) | |
682 | { | |
683 | struct in6_addr *saddr = NULL; | |
684 | struct in6_addr mcaddr; | |
685 | struct net_device *dev = neigh->dev; | |
686 | struct in6_addr *target = (struct in6_addr *)&neigh->primary_key; | |
687 | int probes = atomic_read(&neigh->probes); | |
688 | ||
c346dca1 | 689 | if (skb && ipv6_chk_addr(dev_net(dev), &ipv6_hdr(skb)->saddr, dev, 1)) |
0660e03f | 690 | saddr = &ipv6_hdr(skb)->saddr; |
1da177e4 LT |
691 | |
692 | if ((probes -= neigh->parms->ucast_probes) < 0) { | |
693 | if (!(neigh->nud_state & NUD_VALID)) { | |
5b095d98 | 694 | ND_PRINTK1(KERN_DEBUG "%s(): trying to ucast probe in NUD_INVALID: %pI6\n", |
0c6ce78a | 695 | __func__, target); |
1da177e4 LT |
696 | } |
697 | ndisc_send_ns(dev, neigh, target, target, saddr); | |
698 | } else if ((probes -= neigh->parms->app_probes) < 0) { | |
699 | #ifdef CONFIG_ARPD | |
700 | neigh_app_ns(neigh); | |
701 | #endif | |
702 | } else { | |
703 | addrconf_addr_solict_mult(target, &mcaddr); | |
704 | ndisc_send_ns(dev, NULL, target, &mcaddr, saddr); | |
705 | } | |
706 | } | |
707 | ||
0736ffc0 YH |
708 | static int pndisc_is_router(const void *pkey, |
709 | struct net_device *dev) | |
fa86d322 PE |
710 | { |
711 | struct pneigh_entry *n; | |
0736ffc0 | 712 | int ret = -1; |
fa86d322 PE |
713 | |
714 | read_lock_bh(&nd_tbl.lock); | |
0736ffc0 YH |
715 | n = __pneigh_lookup(&nd_tbl, dev_net(dev), pkey, dev); |
716 | if (n) | |
717 | ret = !!(n->flags & NTF_ROUTER); | |
fa86d322 PE |
718 | read_unlock_bh(&nd_tbl.lock); |
719 | ||
0736ffc0 | 720 | return ret; |
fa86d322 PE |
721 | } |
722 | ||
1da177e4 LT |
723 | static void ndisc_recv_ns(struct sk_buff *skb) |
724 | { | |
9c70220b | 725 | struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb); |
0660e03f ACM |
726 | struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; |
727 | struct in6_addr *daddr = &ipv6_hdr(skb)->daddr; | |
1da177e4 | 728 | u8 *lladdr = NULL; |
27a884dc ACM |
729 | u32 ndoptlen = skb->tail - (skb->transport_header + |
730 | offsetof(struct nd_msg, opt)); | |
1da177e4 LT |
731 | struct ndisc_options ndopts; |
732 | struct net_device *dev = skb->dev; | |
733 | struct inet6_ifaddr *ifp; | |
734 | struct inet6_dev *idev = NULL; | |
735 | struct neighbour *neigh; | |
736 | int dad = ipv6_addr_any(saddr); | |
737 | int inc; | |
0736ffc0 | 738 | int is_router = -1; |
1da177e4 LT |
739 | |
740 | if (ipv6_addr_is_multicast(&msg->target)) { | |
1ab1457c | 741 | ND_PRINTK2(KERN_WARNING |
1da177e4 LT |
742 | "ICMPv6 NS: multicast target address"); |
743 | return; | |
744 | } | |
745 | ||
746 | /* | |
747 | * RFC2461 7.1.1: | |
748 | * DAD has to be destined for solicited node multicast address. | |
749 | */ | |
750 | if (dad && | |
751 | !(daddr->s6_addr32[0] == htonl(0xff020000) && | |
752 | daddr->s6_addr32[1] == htonl(0x00000000) && | |
753 | daddr->s6_addr32[2] == htonl(0x00000001) && | |
754 | daddr->s6_addr [12] == 0xff )) { | |
755 | ND_PRINTK2(KERN_WARNING | |
756 | "ICMPv6 NS: bad DAD packet (wrong destination)\n"); | |
757 | return; | |
758 | } | |
759 | ||
760 | if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) { | |
1ab1457c | 761 | ND_PRINTK2(KERN_WARNING |
1da177e4 LT |
762 | "ICMPv6 NS: invalid ND options\n"); |
763 | return; | |
764 | } | |
765 | ||
766 | if (ndopts.nd_opts_src_lladdr) { | |
767 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, dev); | |
768 | if (!lladdr) { | |
769 | ND_PRINTK2(KERN_WARNING | |
770 | "ICMPv6 NS: invalid link-layer address length\n"); | |
771 | return; | |
772 | } | |
773 | ||
774 | /* RFC2461 7.1.1: | |
1ab1457c YH |
775 | * If the IP source address is the unspecified address, |
776 | * there MUST NOT be source link-layer address option | |
1da177e4 LT |
777 | * in the message. |
778 | */ | |
779 | if (dad) { | |
1ab1457c | 780 | ND_PRINTK2(KERN_WARNING |
1da177e4 LT |
781 | "ICMPv6 NS: bad DAD packet (link-layer address option)\n"); |
782 | return; | |
783 | } | |
784 | } | |
785 | ||
786 | inc = ipv6_addr_is_multicast(daddr); | |
787 | ||
c346dca1 | 788 | ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1); |
a18bc695 | 789 | if (ifp) { |
95c385b4 NH |
790 | |
791 | if (ifp->flags & (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC)) { | |
792 | if (dad) { | |
793 | if (dev->type == ARPHRD_IEEE802_TR) { | |
98e399f8 ACM |
794 | const unsigned char *sadr; |
795 | sadr = skb_mac_header(skb); | |
95c385b4 NH |
796 | if (((sadr[8] ^ dev->dev_addr[0]) & 0x7f) == 0 && |
797 | sadr[9] == dev->dev_addr[1] && | |
798 | sadr[10] == dev->dev_addr[2] && | |
799 | sadr[11] == dev->dev_addr[3] && | |
800 | sadr[12] == dev->dev_addr[4] && | |
801 | sadr[13] == dev->dev_addr[5]) { | |
802 | /* looped-back to us */ | |
803 | goto out; | |
804 | } | |
805 | } | |
806 | ||
807 | /* | |
808 | * We are colliding with another node | |
809 | * who is doing DAD | |
810 | * so fail our DAD process | |
811 | */ | |
812 | addrconf_dad_failure(ifp); | |
9e3be4b3 | 813 | return; |
95c385b4 NH |
814 | } else { |
815 | /* | |
816 | * This is not a dad solicitation. | |
817 | * If we are an optimistic node, | |
818 | * we should respond. | |
819 | * Otherwise, we should ignore it. | |
820 | */ | |
821 | if (!(ifp->flags & IFA_F_OPTIMISTIC)) | |
1da177e4 | 822 | goto out; |
1da177e4 | 823 | } |
1da177e4 LT |
824 | } |
825 | ||
826 | idev = ifp->idev; | |
827 | } else { | |
53b7997f YH |
828 | struct net *net = dev_net(dev); |
829 | ||
1da177e4 LT |
830 | idev = in6_dev_get(dev); |
831 | if (!idev) { | |
832 | /* XXX: count this drop? */ | |
833 | return; | |
834 | } | |
835 | ||
53b7997f | 836 | if (ipv6_chk_acast_addr(net, dev, &msg->target) || |
1ab1457c | 837 | (idev->cnf.forwarding && |
53b7997f | 838 | (net->ipv6.devconf_all->proxy_ndp || idev->cnf.proxy_ndp) && |
0736ffc0 | 839 | (is_router = pndisc_is_router(&msg->target, dev)) >= 0)) { |
a61bbcf2 | 840 | if (!(NEIGH_CB(skb)->flags & LOCALLY_ENQUEUED) && |
1da177e4 LT |
841 | skb->pkt_type != PACKET_HOST && |
842 | inc != 0 && | |
843 | idev->nd_parms->proxy_delay != 0) { | |
844 | /* | |
845 | * for anycast or proxy, | |
1ab1457c YH |
846 | * sender should delay its response |
847 | * by a random time between 0 and | |
1da177e4 LT |
848 | * MAX_ANYCAST_DELAY_TIME seconds. |
849 | * (RFC2461) -- yoshfuji | |
850 | */ | |
851 | struct sk_buff *n = skb_clone(skb, GFP_ATOMIC); | |
852 | if (n) | |
853 | pneigh_enqueue(&nd_tbl, idev->nd_parms, n); | |
854 | goto out; | |
855 | } | |
856 | } else | |
857 | goto out; | |
858 | } | |
859 | ||
0736ffc0 YH |
860 | if (is_router < 0) |
861 | is_router = !!idev->cnf.forwarding; | |
62dd9318 | 862 | |
1da177e4 | 863 | if (dad) { |
f3ee4010 | 864 | ndisc_send_na(dev, NULL, &in6addr_linklocal_allnodes, &msg->target, |
62dd9318 | 865 | is_router, 0, (ifp != NULL), 1); |
1da177e4 LT |
866 | goto out; |
867 | } | |
868 | ||
869 | if (inc) | |
870 | NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_mcast); | |
871 | else | |
872 | NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_ucast); | |
873 | ||
1ab1457c | 874 | /* |
1da177e4 LT |
875 | * update / create cache entry |
876 | * for the source address | |
877 | */ | |
878 | neigh = __neigh_lookup(&nd_tbl, saddr, dev, | |
879 | !inc || lladdr || !dev->addr_len); | |
880 | if (neigh) | |
1ab1457c | 881 | neigh_update(neigh, lladdr, NUD_STALE, |
1da177e4 LT |
882 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
883 | NEIGH_UPDATE_F_OVERRIDE); | |
3b04ddde | 884 | if (neigh || !dev->header_ops) { |
1da177e4 | 885 | ndisc_send_na(dev, neigh, saddr, &msg->target, |
62dd9318 | 886 | is_router, |
1da177e4 LT |
887 | 1, (ifp != NULL && inc), inc); |
888 | if (neigh) | |
889 | neigh_release(neigh); | |
890 | } | |
891 | ||
892 | out: | |
893 | if (ifp) | |
894 | in6_ifa_put(ifp); | |
895 | else | |
896 | in6_dev_put(idev); | |
1da177e4 LT |
897 | } |
898 | ||
899 | static void ndisc_recv_na(struct sk_buff *skb) | |
900 | { | |
9c70220b | 901 | struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb); |
0660e03f ACM |
902 | struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; |
903 | struct in6_addr *daddr = &ipv6_hdr(skb)->daddr; | |
1da177e4 | 904 | u8 *lladdr = NULL; |
27a884dc ACM |
905 | u32 ndoptlen = skb->tail - (skb->transport_header + |
906 | offsetof(struct nd_msg, opt)); | |
1da177e4 LT |
907 | struct ndisc_options ndopts; |
908 | struct net_device *dev = skb->dev; | |
909 | struct inet6_ifaddr *ifp; | |
910 | struct neighbour *neigh; | |
911 | ||
912 | if (skb->len < sizeof(struct nd_msg)) { | |
913 | ND_PRINTK2(KERN_WARNING | |
914 | "ICMPv6 NA: packet too short\n"); | |
915 | return; | |
916 | } | |
917 | ||
918 | if (ipv6_addr_is_multicast(&msg->target)) { | |
919 | ND_PRINTK2(KERN_WARNING | |
920 | "ICMPv6 NA: target address is multicast.\n"); | |
921 | return; | |
922 | } | |
923 | ||
924 | if (ipv6_addr_is_multicast(daddr) && | |
925 | msg->icmph.icmp6_solicited) { | |
926 | ND_PRINTK2(KERN_WARNING | |
927 | "ICMPv6 NA: solicited NA is multicasted.\n"); | |
928 | return; | |
929 | } | |
1ab1457c | 930 | |
1da177e4 LT |
931 | if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) { |
932 | ND_PRINTK2(KERN_WARNING | |
933 | "ICMPv6 NS: invalid ND option\n"); | |
934 | return; | |
935 | } | |
936 | if (ndopts.nd_opts_tgt_lladdr) { | |
937 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, dev); | |
938 | if (!lladdr) { | |
939 | ND_PRINTK2(KERN_WARNING | |
940 | "ICMPv6 NA: invalid link-layer address length\n"); | |
941 | return; | |
942 | } | |
943 | } | |
c346dca1 | 944 | ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1); |
a18bc695 | 945 | if (ifp) { |
1da177e4 LT |
946 | if (ifp->flags & IFA_F_TENTATIVE) { |
947 | addrconf_dad_failure(ifp); | |
948 | return; | |
949 | } | |
950 | /* What should we make now? The advertisement | |
951 | is invalid, but ndisc specs say nothing | |
952 | about it. It could be misconfiguration, or | |
953 | an smart proxy agent tries to help us :-) | |
24fc7b86 JS |
954 | |
955 | We should not print the error if NA has been | |
956 | received from loopback - it is just our own | |
957 | unsolicited advertisement. | |
1da177e4 | 958 | */ |
24fc7b86 JS |
959 | if (skb->pkt_type != PACKET_LOOPBACK) |
960 | ND_PRINTK1(KERN_WARNING | |
a6fa3286 JR |
961 | "ICMPv6 NA: someone advertises our address %pI6 on %s!\n", |
962 | &ifp->addr, ifp->idev->dev->name); | |
1da177e4 LT |
963 | in6_ifa_put(ifp); |
964 | return; | |
965 | } | |
966 | neigh = neigh_lookup(&nd_tbl, &msg->target, dev); | |
967 | ||
968 | if (neigh) { | |
969 | u8 old_flags = neigh->flags; | |
53b7997f | 970 | struct net *net = dev_net(dev); |
1da177e4 LT |
971 | |
972 | if (neigh->nud_state & NUD_FAILED) | |
973 | goto out; | |
974 | ||
5f3e6e9e VN |
975 | /* |
976 | * Don't update the neighbor cache entry on a proxy NA from | |
977 | * ourselves because either the proxied node is off link or it | |
978 | * has already sent a NA to us. | |
979 | */ | |
980 | if (lladdr && !memcmp(lladdr, dev->dev_addr, dev->addr_len) && | |
53b7997f YH |
981 | net->ipv6.devconf_all->forwarding && net->ipv6.devconf_all->proxy_ndp && |
982 | pneigh_lookup(&nd_tbl, net, &msg->target, dev, 0)) { | |
fbea49e1 | 983 | /* XXX: idev->cnf.prixy_ndp */ |
5f3e6e9e | 984 | goto out; |
fbea49e1 | 985 | } |
5f3e6e9e | 986 | |
1da177e4 LT |
987 | neigh_update(neigh, lladdr, |
988 | msg->icmph.icmp6_solicited ? NUD_REACHABLE : NUD_STALE, | |
989 | NEIGH_UPDATE_F_WEAK_OVERRIDE| | |
990 | (msg->icmph.icmp6_override ? NEIGH_UPDATE_F_OVERRIDE : 0)| | |
991 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
992 | (msg->icmph.icmp6_router ? NEIGH_UPDATE_F_ISROUTER : 0)); | |
993 | ||
994 | if ((old_flags & ~neigh->flags) & NTF_ROUTER) { | |
995 | /* | |
996 | * Change: router to host | |
997 | */ | |
998 | struct rt6_info *rt; | |
999 | rt = rt6_get_dflt_router(saddr, dev); | |
1000 | if (rt) | |
e0a1ad73 | 1001 | ip6_del_rt(rt); |
1da177e4 LT |
1002 | } |
1003 | ||
1004 | out: | |
1005 | neigh_release(neigh); | |
1006 | } | |
1007 | } | |
1008 | ||
1009 | static void ndisc_recv_rs(struct sk_buff *skb) | |
1010 | { | |
9c70220b | 1011 | struct rs_msg *rs_msg = (struct rs_msg *)skb_transport_header(skb); |
1da177e4 LT |
1012 | unsigned long ndoptlen = skb->len - sizeof(*rs_msg); |
1013 | struct neighbour *neigh; | |
1014 | struct inet6_dev *idev; | |
0660e03f | 1015 | struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; |
1da177e4 LT |
1016 | struct ndisc_options ndopts; |
1017 | u8 *lladdr = NULL; | |
1018 | ||
1019 | if (skb->len < sizeof(*rs_msg)) | |
1020 | return; | |
1021 | ||
1022 | idev = in6_dev_get(skb->dev); | |
1023 | if (!idev) { | |
1024 | if (net_ratelimit()) | |
1025 | ND_PRINTK1("ICMP6 RS: can't find in6 device\n"); | |
1026 | return; | |
1027 | } | |
1028 | ||
1029 | /* Don't accept RS if we're not in router mode */ | |
1030 | if (!idev->cnf.forwarding) | |
1031 | goto out; | |
1032 | ||
1033 | /* | |
1034 | * Don't update NCE if src = ::; | |
1035 | * this implies that the source node has no ip address assigned yet. | |
1036 | */ | |
1037 | if (ipv6_addr_any(saddr)) | |
1038 | goto out; | |
1039 | ||
1040 | /* Parse ND options */ | |
1041 | if (!ndisc_parse_options(rs_msg->opt, ndoptlen, &ndopts)) { | |
1042 | if (net_ratelimit()) | |
1043 | ND_PRINTK2("ICMP6 NS: invalid ND option, ignored\n"); | |
1044 | goto out; | |
1045 | } | |
1046 | ||
1047 | if (ndopts.nd_opts_src_lladdr) { | |
1048 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, | |
1049 | skb->dev); | |
1050 | if (!lladdr) | |
1051 | goto out; | |
1052 | } | |
1053 | ||
1054 | neigh = __neigh_lookup(&nd_tbl, saddr, skb->dev, 1); | |
1055 | if (neigh) { | |
1056 | neigh_update(neigh, lladdr, NUD_STALE, | |
1057 | NEIGH_UPDATE_F_WEAK_OVERRIDE| | |
1058 | NEIGH_UPDATE_F_OVERRIDE| | |
1059 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER); | |
1060 | neigh_release(neigh); | |
1061 | } | |
1062 | out: | |
1063 | in6_dev_put(idev); | |
1064 | } | |
1065 | ||
31910575 PY |
1066 | static void ndisc_ra_useropt(struct sk_buff *ra, struct nd_opt_hdr *opt) |
1067 | { | |
1068 | struct icmp6hdr *icmp6h = (struct icmp6hdr *)skb_transport_header(ra); | |
1069 | struct sk_buff *skb; | |
1070 | struct nlmsghdr *nlh; | |
1071 | struct nduseroptmsg *ndmsg; | |
c346dca1 | 1072 | struct net *net = dev_net(ra->dev); |
31910575 PY |
1073 | int err; |
1074 | int base_size = NLMSG_ALIGN(sizeof(struct nduseroptmsg) | |
1075 | + (opt->nd_opt_len << 3)); | |
1076 | size_t msg_size = base_size + nla_total_size(sizeof(struct in6_addr)); | |
1077 | ||
1078 | skb = nlmsg_new(msg_size, GFP_ATOMIC); | |
1079 | if (skb == NULL) { | |
1080 | err = -ENOBUFS; | |
1081 | goto errout; | |
1082 | } | |
1083 | ||
1084 | nlh = nlmsg_put(skb, 0, 0, RTM_NEWNDUSEROPT, base_size, 0); | |
1085 | if (nlh == NULL) { | |
1086 | goto nla_put_failure; | |
1087 | } | |
1088 | ||
1089 | ndmsg = nlmsg_data(nlh); | |
1090 | ndmsg->nduseropt_family = AF_INET6; | |
dbb2ed24 | 1091 | ndmsg->nduseropt_ifindex = ra->dev->ifindex; |
31910575 PY |
1092 | ndmsg->nduseropt_icmp_type = icmp6h->icmp6_type; |
1093 | ndmsg->nduseropt_icmp_code = icmp6h->icmp6_code; | |
1094 | ndmsg->nduseropt_opts_len = opt->nd_opt_len << 3; | |
1095 | ||
1096 | memcpy(ndmsg + 1, opt, opt->nd_opt_len << 3); | |
1097 | ||
1098 | NLA_PUT(skb, NDUSEROPT_SRCADDR, sizeof(struct in6_addr), | |
1099 | &ipv6_hdr(ra)->saddr); | |
1100 | nlmsg_end(skb, nlh); | |
1101 | ||
1ce85fe4 | 1102 | rtnl_notify(skb, net, 0, RTNLGRP_ND_USEROPT, NULL, GFP_ATOMIC); |
31910575 PY |
1103 | return; |
1104 | ||
1105 | nla_put_failure: | |
1106 | nlmsg_free(skb); | |
1107 | err = -EMSGSIZE; | |
1108 | errout: | |
a18bc695 | 1109 | rtnl_set_sk_err(net, RTNLGRP_ND_USEROPT, err); |
31910575 PY |
1110 | } |
1111 | ||
65e9b62d TG |
1112 | static inline int accept_ra(struct inet6_dev *in6_dev) |
1113 | { | |
1114 | /* | |
1115 | * If forwarding is enabled, RA are not accepted unless the special | |
1116 | * hybrid mode (accept_ra=2) is enabled. | |
1117 | */ | |
1118 | if (in6_dev->cnf.forwarding && in6_dev->cnf.accept_ra < 2) | |
1119 | return 0; | |
1120 | ||
1121 | return in6_dev->cnf.accept_ra; | |
1122 | } | |
1123 | ||
1da177e4 LT |
1124 | static void ndisc_router_discovery(struct sk_buff *skb) |
1125 | { | |
9c70220b | 1126 | struct ra_msg *ra_msg = (struct ra_msg *)skb_transport_header(skb); |
1da177e4 LT |
1127 | struct neighbour *neigh = NULL; |
1128 | struct inet6_dev *in6_dev; | |
65f5c7c1 | 1129 | struct rt6_info *rt = NULL; |
1da177e4 LT |
1130 | int lifetime; |
1131 | struct ndisc_options ndopts; | |
1132 | int optlen; | |
ebacaaa0 | 1133 | unsigned int pref = 0; |
1da177e4 LT |
1134 | |
1135 | __u8 * opt = (__u8 *)(ra_msg + 1); | |
1136 | ||
27a884dc | 1137 | optlen = (skb->tail - skb->transport_header) - sizeof(struct ra_msg); |
1da177e4 | 1138 | |
0660e03f | 1139 | if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) { |
1da177e4 LT |
1140 | ND_PRINTK2(KERN_WARNING |
1141 | "ICMPv6 RA: source address is not link-local.\n"); | |
1142 | return; | |
1143 | } | |
1144 | if (optlen < 0) { | |
1ab1457c | 1145 | ND_PRINTK2(KERN_WARNING |
1da177e4 LT |
1146 | "ICMPv6 RA: packet too short\n"); |
1147 | return; | |
1148 | } | |
1149 | ||
de357cc0 | 1150 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 TF |
1151 | if (skb->ndisc_nodetype == NDISC_NODETYPE_HOST) { |
1152 | ND_PRINTK2(KERN_WARNING | |
1153 | "ICMPv6 RA: from host or unauthorized router\n"); | |
1154 | return; | |
1155 | } | |
de357cc0 | 1156 | #endif |
fadf6bf0 | 1157 | |
1da177e4 LT |
1158 | /* |
1159 | * set the RA_RECV flag in the interface | |
1160 | */ | |
1161 | ||
1162 | in6_dev = in6_dev_get(skb->dev); | |
1163 | if (in6_dev == NULL) { | |
1164 | ND_PRINTK0(KERN_ERR | |
1165 | "ICMPv6 RA: can't find inet6 device for %s.\n", | |
1166 | skb->dev->name); | |
1167 | return; | |
1168 | } | |
1da177e4 LT |
1169 | |
1170 | if (!ndisc_parse_options(opt, optlen, &ndopts)) { | |
1171 | in6_dev_put(in6_dev); | |
1172 | ND_PRINTK2(KERN_WARNING | |
1173 | "ICMP6 RA: invalid ND options\n"); | |
1174 | return; | |
1175 | } | |
1176 | ||
65e9b62d | 1177 | if (!accept_ra(in6_dev)) |
31ce8c71 DW |
1178 | goto skip_linkparms; |
1179 | ||
de357cc0 | 1180 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 TF |
1181 | /* skip link-specific parameters from interior routers */ |
1182 | if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT) | |
1183 | goto skip_linkparms; | |
de357cc0 | 1184 | #endif |
fadf6bf0 | 1185 | |
1da177e4 LT |
1186 | if (in6_dev->if_flags & IF_RS_SENT) { |
1187 | /* | |
1188 | * flag that an RA was received after an RS was sent | |
1189 | * out on this interface. | |
1190 | */ | |
1191 | in6_dev->if_flags |= IF_RA_RCVD; | |
1192 | } | |
1193 | ||
1194 | /* | |
1195 | * Remember the managed/otherconf flags from most recently | |
1196 | * received RA message (RFC 2462) -- yoshfuji | |
1197 | */ | |
1198 | in6_dev->if_flags = (in6_dev->if_flags & ~(IF_RA_MANAGED | | |
1199 | IF_RA_OTHERCONF)) | | |
1200 | (ra_msg->icmph.icmp6_addrconf_managed ? | |
1201 | IF_RA_MANAGED : 0) | | |
1202 | (ra_msg->icmph.icmp6_addrconf_other ? | |
1203 | IF_RA_OTHERCONF : 0); | |
1204 | ||
65f5c7c1 YH |
1205 | if (!in6_dev->cnf.accept_ra_defrtr) |
1206 | goto skip_defrtr; | |
1207 | ||
1da177e4 LT |
1208 | lifetime = ntohs(ra_msg->icmph.icmp6_rt_lifetime); |
1209 | ||
ebacaaa0 YH |
1210 | #ifdef CONFIG_IPV6_ROUTER_PREF |
1211 | pref = ra_msg->icmph.icmp6_router_pref; | |
1212 | /* 10b is handled as if it were 00b (medium) */ | |
930d6ff2 | 1213 | if (pref == ICMPV6_ROUTER_PREF_INVALID || |
6d5b78cd | 1214 | !in6_dev->cnf.accept_ra_rtr_pref) |
ebacaaa0 YH |
1215 | pref = ICMPV6_ROUTER_PREF_MEDIUM; |
1216 | #endif | |
1217 | ||
0660e03f | 1218 | rt = rt6_get_dflt_router(&ipv6_hdr(skb)->saddr, skb->dev); |
1da177e4 LT |
1219 | |
1220 | if (rt) | |
1221 | neigh = rt->rt6i_nexthop; | |
1222 | ||
1223 | if (rt && lifetime == 0) { | |
1224 | neigh_clone(neigh); | |
e0a1ad73 | 1225 | ip6_del_rt(rt); |
1da177e4 LT |
1226 | rt = NULL; |
1227 | } | |
1228 | ||
1229 | if (rt == NULL && lifetime) { | |
1230 | ND_PRINTK3(KERN_DEBUG | |
1231 | "ICMPv6 RA: adding default router.\n"); | |
1232 | ||
0660e03f | 1233 | rt = rt6_add_dflt_router(&ipv6_hdr(skb)->saddr, skb->dev, pref); |
1da177e4 LT |
1234 | if (rt == NULL) { |
1235 | ND_PRINTK0(KERN_ERR | |
1236 | "ICMPv6 RA: %s() failed to add default route.\n", | |
0dc47877 | 1237 | __func__); |
1da177e4 LT |
1238 | in6_dev_put(in6_dev); |
1239 | return; | |
1240 | } | |
1241 | ||
1242 | neigh = rt->rt6i_nexthop; | |
1243 | if (neigh == NULL) { | |
1244 | ND_PRINTK0(KERN_ERR | |
1245 | "ICMPv6 RA: %s() got default router without neighbour.\n", | |
0dc47877 | 1246 | __func__); |
d8d1f30b | 1247 | dst_release(&rt->dst); |
1da177e4 LT |
1248 | in6_dev_put(in6_dev); |
1249 | return; | |
1250 | } | |
1251 | neigh->flags |= NTF_ROUTER; | |
ebacaaa0 | 1252 | } else if (rt) { |
22441cfa | 1253 | rt->rt6i_flags = (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); |
1da177e4 LT |
1254 | } |
1255 | ||
1256 | if (rt) | |
1257 | rt->rt6i_expires = jiffies + (HZ * lifetime); | |
1258 | ||
1259 | if (ra_msg->icmph.icmp6_hop_limit) { | |
1260 | in6_dev->cnf.hop_limit = ra_msg->icmph.icmp6_hop_limit; | |
1261 | if (rt) | |
d8d1f30b | 1262 | rt->dst.metrics[RTAX_HOPLIMIT-1] = ra_msg->icmph.icmp6_hop_limit; |
1da177e4 LT |
1263 | } |
1264 | ||
65f5c7c1 YH |
1265 | skip_defrtr: |
1266 | ||
1da177e4 LT |
1267 | /* |
1268 | * Update Reachable Time and Retrans Timer | |
1269 | */ | |
1270 | ||
1271 | if (in6_dev->nd_parms) { | |
1272 | unsigned long rtime = ntohl(ra_msg->retrans_timer); | |
1273 | ||
1274 | if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/HZ) { | |
1275 | rtime = (rtime*HZ)/1000; | |
1276 | if (rtime < HZ/10) | |
1277 | rtime = HZ/10; | |
1278 | in6_dev->nd_parms->retrans_time = rtime; | |
1279 | in6_dev->tstamp = jiffies; | |
1280 | inet6_ifinfo_notify(RTM_NEWLINK, in6_dev); | |
1281 | } | |
1282 | ||
1283 | rtime = ntohl(ra_msg->reachable_time); | |
1284 | if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/(3*HZ)) { | |
1285 | rtime = (rtime*HZ)/1000; | |
1286 | ||
1287 | if (rtime < HZ/10) | |
1288 | rtime = HZ/10; | |
1289 | ||
1290 | if (rtime != in6_dev->nd_parms->base_reachable_time) { | |
1291 | in6_dev->nd_parms->base_reachable_time = rtime; | |
1292 | in6_dev->nd_parms->gc_staletime = 3 * rtime; | |
1293 | in6_dev->nd_parms->reachable_time = neigh_rand_reach_time(rtime); | |
1294 | in6_dev->tstamp = jiffies; | |
1295 | inet6_ifinfo_notify(RTM_NEWLINK, in6_dev); | |
1296 | } | |
1297 | } | |
1298 | } | |
1299 | ||
fadf6bf0 TF |
1300 | skip_linkparms: |
1301 | ||
1da177e4 LT |
1302 | /* |
1303 | * Process options. | |
1304 | */ | |
1305 | ||
1306 | if (!neigh) | |
0660e03f | 1307 | neigh = __neigh_lookup(&nd_tbl, &ipv6_hdr(skb)->saddr, |
1da177e4 LT |
1308 | skb->dev, 1); |
1309 | if (neigh) { | |
1310 | u8 *lladdr = NULL; | |
1311 | if (ndopts.nd_opts_src_lladdr) { | |
1312 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, | |
1313 | skb->dev); | |
1314 | if (!lladdr) { | |
1315 | ND_PRINTK2(KERN_WARNING | |
1316 | "ICMPv6 RA: invalid link-layer address length\n"); | |
1317 | goto out; | |
1318 | } | |
1319 | } | |
1320 | neigh_update(neigh, lladdr, NUD_STALE, | |
1321 | NEIGH_UPDATE_F_WEAK_OVERRIDE| | |
1322 | NEIGH_UPDATE_F_OVERRIDE| | |
1323 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
1324 | NEIGH_UPDATE_F_ISROUTER); | |
1325 | } | |
1326 | ||
65e9b62d | 1327 | if (!accept_ra(in6_dev)) |
31ce8c71 DW |
1328 | goto out; |
1329 | ||
70ceb4f5 | 1330 | #ifdef CONFIG_IPV6_ROUTE_INFO |
09c884d4 | 1331 | if (in6_dev->cnf.accept_ra_rtr_pref && ndopts.nd_opts_ri) { |
70ceb4f5 YH |
1332 | struct nd_opt_hdr *p; |
1333 | for (p = ndopts.nd_opts_ri; | |
1334 | p; | |
1335 | p = ndisc_next_option(p, ndopts.nd_opts_ri_end)) { | |
6294e000 YH |
1336 | struct route_info *ri = (struct route_info *)p; |
1337 | #ifdef CONFIG_IPV6_NDISC_NODETYPE | |
1338 | if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT && | |
1339 | ri->prefix_len == 0) | |
1340 | continue; | |
1341 | #endif | |
1342 | if (ri->prefix_len > in6_dev->cnf.accept_ra_rt_info_max_plen) | |
09c884d4 | 1343 | continue; |
70ceb4f5 | 1344 | rt6_route_rcv(skb->dev, (u8*)p, (p->nd_opt_len) << 3, |
0660e03f | 1345 | &ipv6_hdr(skb)->saddr); |
70ceb4f5 YH |
1346 | } |
1347 | } | |
1348 | #endif | |
1349 | ||
de357cc0 | 1350 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 TF |
1351 | /* skip link-specific ndopts from interior routers */ |
1352 | if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT) | |
1353 | goto out; | |
de357cc0 | 1354 | #endif |
fadf6bf0 | 1355 | |
c4fd30eb | 1356 | if (in6_dev->cnf.accept_ra_pinfo && ndopts.nd_opts_pi) { |
1da177e4 LT |
1357 | struct nd_opt_hdr *p; |
1358 | for (p = ndopts.nd_opts_pi; | |
1359 | p; | |
1360 | p = ndisc_next_option(p, ndopts.nd_opts_pi_end)) { | |
1361 | addrconf_prefix_rcv(skb->dev, (u8*)p, (p->nd_opt_len) << 3); | |
1362 | } | |
1363 | } | |
1364 | ||
1365 | if (ndopts.nd_opts_mtu) { | |
e69a4adc | 1366 | __be32 n; |
1da177e4 LT |
1367 | u32 mtu; |
1368 | ||
e69a4adc AV |
1369 | memcpy(&n, ((u8*)(ndopts.nd_opts_mtu+1))+2, sizeof(mtu)); |
1370 | mtu = ntohl(n); | |
1da177e4 LT |
1371 | |
1372 | if (mtu < IPV6_MIN_MTU || mtu > skb->dev->mtu) { | |
1373 | ND_PRINTK2(KERN_WARNING | |
1374 | "ICMPv6 RA: invalid mtu: %d\n", | |
1375 | mtu); | |
1376 | } else if (in6_dev->cnf.mtu6 != mtu) { | |
1377 | in6_dev->cnf.mtu6 = mtu; | |
1378 | ||
1379 | if (rt) | |
d8d1f30b | 1380 | rt->dst.metrics[RTAX_MTU-1] = mtu; |
1da177e4 LT |
1381 | |
1382 | rt6_mtu_change(skb->dev, mtu); | |
1383 | } | |
1384 | } | |
1ab1457c | 1385 | |
31910575 | 1386 | if (ndopts.nd_useropts) { |
61cf46ad YH |
1387 | struct nd_opt_hdr *p; |
1388 | for (p = ndopts.nd_useropts; | |
1389 | p; | |
1390 | p = ndisc_next_useropt(p, ndopts.nd_useropts_end)) { | |
1391 | ndisc_ra_useropt(skb, p); | |
31910575 PY |
1392 | } |
1393 | } | |
1394 | ||
1da177e4 LT |
1395 | if (ndopts.nd_opts_tgt_lladdr || ndopts.nd_opts_rh) { |
1396 | ND_PRINTK2(KERN_WARNING | |
1397 | "ICMPv6 RA: invalid RA options"); | |
1398 | } | |
1399 | out: | |
1400 | if (rt) | |
d8d1f30b | 1401 | dst_release(&rt->dst); |
1da177e4 LT |
1402 | else if (neigh) |
1403 | neigh_release(neigh); | |
1404 | in6_dev_put(in6_dev); | |
1405 | } | |
1406 | ||
1407 | static void ndisc_redirect_rcv(struct sk_buff *skb) | |
1408 | { | |
1409 | struct inet6_dev *in6_dev; | |
1410 | struct icmp6hdr *icmph; | |
1411 | struct in6_addr *dest; | |
1412 | struct in6_addr *target; /* new first hop to destination */ | |
1413 | struct neighbour *neigh; | |
1414 | int on_link = 0; | |
1415 | struct ndisc_options ndopts; | |
1416 | int optlen; | |
1417 | u8 *lladdr = NULL; | |
1418 | ||
de357cc0 | 1419 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 TF |
1420 | switch (skb->ndisc_nodetype) { |
1421 | case NDISC_NODETYPE_HOST: | |
1422 | case NDISC_NODETYPE_NODEFAULT: | |
1423 | ND_PRINTK2(KERN_WARNING | |
1424 | "ICMPv6 Redirect: from host or unauthorized router\n"); | |
1425 | return; | |
1426 | } | |
de357cc0 | 1427 | #endif |
fadf6bf0 | 1428 | |
0660e03f | 1429 | if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) { |
1da177e4 LT |
1430 | ND_PRINTK2(KERN_WARNING |
1431 | "ICMPv6 Redirect: source address is not link-local.\n"); | |
1432 | return; | |
1433 | } | |
1434 | ||
27a884dc | 1435 | optlen = skb->tail - skb->transport_header; |
1da177e4 LT |
1436 | optlen -= sizeof(struct icmp6hdr) + 2 * sizeof(struct in6_addr); |
1437 | ||
1438 | if (optlen < 0) { | |
1439 | ND_PRINTK2(KERN_WARNING | |
1440 | "ICMPv6 Redirect: packet too short\n"); | |
1441 | return; | |
1442 | } | |
1443 | ||
cc70ab26 | 1444 | icmph = icmp6_hdr(skb); |
1da177e4 LT |
1445 | target = (struct in6_addr *) (icmph + 1); |
1446 | dest = target + 1; | |
1447 | ||
1448 | if (ipv6_addr_is_multicast(dest)) { | |
1449 | ND_PRINTK2(KERN_WARNING | |
1450 | "ICMPv6 Redirect: destination address is multicast.\n"); | |
1451 | return; | |
1452 | } | |
1453 | ||
1454 | if (ipv6_addr_equal(dest, target)) { | |
1455 | on_link = 1; | |
bf0b48df BH |
1456 | } else if (ipv6_addr_type(target) != |
1457 | (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) { | |
1ab1457c | 1458 | ND_PRINTK2(KERN_WARNING |
bf0b48df | 1459 | "ICMPv6 Redirect: target address is not link-local unicast.\n"); |
1da177e4 LT |
1460 | return; |
1461 | } | |
1462 | ||
1463 | in6_dev = in6_dev_get(skb->dev); | |
1464 | if (!in6_dev) | |
1465 | return; | |
1466 | if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects) { | |
1467 | in6_dev_put(in6_dev); | |
1468 | return; | |
1469 | } | |
1470 | ||
1ab1457c | 1471 | /* RFC2461 8.1: |
1da177e4 LT |
1472 | * The IP source address of the Redirect MUST be the same as the current |
1473 | * first-hop router for the specified ICMP Destination Address. | |
1474 | */ | |
1ab1457c | 1475 | |
1da177e4 LT |
1476 | if (!ndisc_parse_options((u8*)(dest + 1), optlen, &ndopts)) { |
1477 | ND_PRINTK2(KERN_WARNING | |
1478 | "ICMPv6 Redirect: invalid ND options\n"); | |
1479 | in6_dev_put(in6_dev); | |
1480 | return; | |
1481 | } | |
1482 | if (ndopts.nd_opts_tgt_lladdr) { | |
1483 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, | |
1484 | skb->dev); | |
1485 | if (!lladdr) { | |
1486 | ND_PRINTK2(KERN_WARNING | |
1487 | "ICMPv6 Redirect: invalid link-layer address length\n"); | |
1488 | in6_dev_put(in6_dev); | |
1489 | return; | |
1490 | } | |
1491 | } | |
1492 | ||
1493 | neigh = __neigh_lookup(&nd_tbl, target, skb->dev, 1); | |
1494 | if (neigh) { | |
0660e03f ACM |
1495 | rt6_redirect(dest, &ipv6_hdr(skb)->daddr, |
1496 | &ipv6_hdr(skb)->saddr, neigh, lladdr, | |
1da177e4 LT |
1497 | on_link); |
1498 | neigh_release(neigh); | |
1499 | } | |
1500 | in6_dev_put(in6_dev); | |
1501 | } | |
1502 | ||
1503 | void ndisc_send_redirect(struct sk_buff *skb, struct neighbour *neigh, | |
9acd9f3a | 1504 | const struct in6_addr *target) |
1da177e4 | 1505 | { |
1762f7e8 | 1506 | struct net_device *dev = skb->dev; |
c346dca1 | 1507 | struct net *net = dev_net(dev); |
1762f7e8 | 1508 | struct sock *sk = net->ipv6.ndisc_sk; |
1da177e4 LT |
1509 | int len = sizeof(struct icmp6hdr) + 2 * sizeof(struct in6_addr); |
1510 | struct sk_buff *buff; | |
1511 | struct icmp6hdr *icmph; | |
1512 | struct in6_addr saddr_buf; | |
1513 | struct in6_addr *addrp; | |
1da177e4 LT |
1514 | struct rt6_info *rt; |
1515 | struct dst_entry *dst; | |
1516 | struct inet6_dev *idev; | |
1517 | struct flowi fl; | |
1518 | u8 *opt; | |
1519 | int rd_len; | |
1520 | int err; | |
1da177e4 LT |
1521 | u8 ha_buf[MAX_ADDR_LEN], *ha = NULL; |
1522 | ||
95c385b4 | 1523 | if (ipv6_get_lladdr(dev, &saddr_buf, IFA_F_TENTATIVE)) { |
1da177e4 LT |
1524 | ND_PRINTK2(KERN_WARNING |
1525 | "ICMPv6 Redirect: no link-local address on %s\n", | |
1526 | dev->name); | |
1ab1457c YH |
1527 | return; |
1528 | } | |
1da177e4 | 1529 | |
0660e03f | 1530 | if (!ipv6_addr_equal(&ipv6_hdr(skb)->daddr, target) && |
bf0b48df | 1531 | ipv6_addr_type(target) != (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) { |
29556526 | 1532 | ND_PRINTK2(KERN_WARNING |
bf0b48df | 1533 | "ICMPv6 Redirect: target address is not link-local unicast.\n"); |
29556526 LY |
1534 | return; |
1535 | } | |
1536 | ||
1762f7e8 | 1537 | icmpv6_flow_init(sk, &fl, NDISC_REDIRECT, |
95e41e93 | 1538 | &saddr_buf, &ipv6_hdr(skb)->saddr, dev->ifindex); |
1da177e4 | 1539 | |
1762f7e8 | 1540 | dst = ip6_route_output(net, NULL, &fl); |
1da177e4 LT |
1541 | if (dst == NULL) |
1542 | return; | |
1543 | ||
52479b62 | 1544 | err = xfrm_lookup(net, &dst, &fl, NULL, 0); |
e104411b | 1545 | if (err) |
1da177e4 | 1546 | return; |
1da177e4 LT |
1547 | |
1548 | rt = (struct rt6_info *) dst; | |
1549 | ||
1550 | if (rt->rt6i_flags & RTF_GATEWAY) { | |
1551 | ND_PRINTK2(KERN_WARNING | |
1552 | "ICMPv6 Redirect: destination is not a neighbour.\n"); | |
d73f0801 | 1553 | goto release; |
1da177e4 | 1554 | } |
d73f0801 IJ |
1555 | if (!xrlim_allow(dst, 1*HZ)) |
1556 | goto release; | |
1da177e4 LT |
1557 | |
1558 | if (dev->addr_len) { | |
1559 | read_lock_bh(&neigh->lock); | |
1560 | if (neigh->nud_state & NUD_VALID) { | |
1561 | memcpy(ha_buf, neigh->ha, dev->addr_len); | |
1562 | read_unlock_bh(&neigh->lock); | |
1563 | ha = ha_buf; | |
1564 | len += ndisc_opt_addr_space(dev); | |
1565 | } else | |
1566 | read_unlock_bh(&neigh->lock); | |
1567 | } | |
1568 | ||
1569 | rd_len = min_t(unsigned int, | |
1570 | IPV6_MIN_MTU-sizeof(struct ipv6hdr)-len, skb->len + 8); | |
1571 | rd_len &= ~0x7; | |
1572 | len += rd_len; | |
1573 | ||
d54a81d3 DM |
1574 | buff = sock_alloc_send_skb(sk, |
1575 | (MAX_HEADER + sizeof(struct ipv6hdr) + | |
f5184d26 | 1576 | len + LL_ALLOCATED_SPACE(dev)), |
1da177e4 LT |
1577 | 1, &err); |
1578 | if (buff == NULL) { | |
1579 | ND_PRINTK0(KERN_ERR | |
dae9de8e BH |
1580 | "ICMPv6 Redirect: %s() failed to allocate an skb, err=%d.\n", |
1581 | __func__, err); | |
d73f0801 | 1582 | goto release; |
1da177e4 LT |
1583 | } |
1584 | ||
1da177e4 | 1585 | skb_reserve(buff, LL_RESERVED_SPACE(dev)); |
0660e03f | 1586 | ip6_nd_hdr(sk, buff, dev, &saddr_buf, &ipv6_hdr(skb)->saddr, |
1da177e4 LT |
1587 | IPPROTO_ICMPV6, len); |
1588 | ||
27a884dc | 1589 | skb_set_transport_header(buff, skb_tail_pointer(buff) - buff->data); |
d10ba34b ACM |
1590 | skb_put(buff, len); |
1591 | icmph = icmp6_hdr(buff); | |
1da177e4 LT |
1592 | |
1593 | memset(icmph, 0, sizeof(struct icmp6hdr)); | |
1594 | icmph->icmp6_type = NDISC_REDIRECT; | |
1595 | ||
1596 | /* | |
1597 | * copy target and destination addresses | |
1598 | */ | |
1599 | ||
1600 | addrp = (struct in6_addr *)(icmph + 1); | |
1601 | ipv6_addr_copy(addrp, target); | |
1602 | addrp++; | |
0660e03f | 1603 | ipv6_addr_copy(addrp, &ipv6_hdr(skb)->daddr); |
1da177e4 LT |
1604 | |
1605 | opt = (u8*) (addrp + 1); | |
1606 | ||
1607 | /* | |
1608 | * include target_address option | |
1609 | */ | |
1610 | ||
1611 | if (ha) | |
1612 | opt = ndisc_fill_addr_option(opt, ND_OPT_TARGET_LL_ADDR, ha, | |
1613 | dev->addr_len, dev->type); | |
1614 | ||
1615 | /* | |
1616 | * build redirect option and copy skb over to the new packet. | |
1617 | */ | |
1618 | ||
1ab1457c | 1619 | memset(opt, 0, 8); |
1da177e4 LT |
1620 | *(opt++) = ND_OPT_REDIRECT_HDR; |
1621 | *(opt++) = (rd_len >> 3); | |
1622 | opt += 6; | |
1623 | ||
0660e03f | 1624 | memcpy(opt, ipv6_hdr(skb), rd_len - 8); |
1da177e4 | 1625 | |
0660e03f | 1626 | icmph->icmp6_cksum = csum_ipv6_magic(&saddr_buf, &ipv6_hdr(skb)->saddr, |
1da177e4 | 1627 | len, IPPROTO_ICMPV6, |
07f0757a | 1628 | csum_partial(icmph, len, 0)); |
1da177e4 | 1629 | |
adf30907 | 1630 | skb_dst_set(buff, dst); |
1da177e4 | 1631 | idev = in6_dev_get(dst->dev); |
edf391ff | 1632 | IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len); |
b2e0b385 | 1633 | err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, buff, NULL, dst->dev, |
6e23ae2a | 1634 | dst_output); |
1da177e4 | 1635 | if (!err) { |
5c5d244b | 1636 | ICMP6MSGOUT_INC_STATS(net, idev, NDISC_REDIRECT); |
a862f6a6 | 1637 | ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); |
1da177e4 LT |
1638 | } |
1639 | ||
1640 | if (likely(idev != NULL)) | |
1641 | in6_dev_put(idev); | |
d73f0801 IJ |
1642 | return; |
1643 | ||
1644 | release: | |
1645 | dst_release(dst); | |
1da177e4 LT |
1646 | } |
1647 | ||
1648 | static void pndisc_redo(struct sk_buff *skb) | |
1649 | { | |
140e26fc | 1650 | ndisc_recv_ns(skb); |
1da177e4 LT |
1651 | kfree_skb(skb); |
1652 | } | |
1653 | ||
1654 | int ndisc_rcv(struct sk_buff *skb) | |
1655 | { | |
1656 | struct nd_msg *msg; | |
1657 | ||
1658 | if (!pskb_may_pull(skb, skb->len)) | |
1659 | return 0; | |
1660 | ||
9c70220b | 1661 | msg = (struct nd_msg *)skb_transport_header(skb); |
1da177e4 | 1662 | |
9c70220b | 1663 | __skb_push(skb, skb->data - skb_transport_header(skb)); |
1da177e4 | 1664 | |
0660e03f | 1665 | if (ipv6_hdr(skb)->hop_limit != 255) { |
1da177e4 LT |
1666 | ND_PRINTK2(KERN_WARNING |
1667 | "ICMPv6 NDISC: invalid hop-limit: %d\n", | |
0660e03f | 1668 | ipv6_hdr(skb)->hop_limit); |
1da177e4 LT |
1669 | return 0; |
1670 | } | |
1671 | ||
1672 | if (msg->icmph.icmp6_code != 0) { | |
1ab1457c | 1673 | ND_PRINTK2(KERN_WARNING |
1da177e4 LT |
1674 | "ICMPv6 NDISC: invalid ICMPv6 code: %d\n", |
1675 | msg->icmph.icmp6_code); | |
1676 | return 0; | |
1677 | } | |
1678 | ||
a61bbcf2 PM |
1679 | memset(NEIGH_CB(skb), 0, sizeof(struct neighbour_cb)); |
1680 | ||
1da177e4 LT |
1681 | switch (msg->icmph.icmp6_type) { |
1682 | case NDISC_NEIGHBOUR_SOLICITATION: | |
1683 | ndisc_recv_ns(skb); | |
1684 | break; | |
1685 | ||
1686 | case NDISC_NEIGHBOUR_ADVERTISEMENT: | |
1687 | ndisc_recv_na(skb); | |
1688 | break; | |
1689 | ||
1690 | case NDISC_ROUTER_SOLICITATION: | |
1691 | ndisc_recv_rs(skb); | |
1692 | break; | |
1693 | ||
1694 | case NDISC_ROUTER_ADVERTISEMENT: | |
1695 | ndisc_router_discovery(skb); | |
1696 | break; | |
1697 | ||
1698 | case NDISC_REDIRECT: | |
1699 | ndisc_redirect_rcv(skb); | |
1700 | break; | |
3ff50b79 | 1701 | } |
1da177e4 LT |
1702 | |
1703 | return 0; | |
1704 | } | |
1705 | ||
1706 | static int ndisc_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1707 | { | |
1708 | struct net_device *dev = ptr; | |
c346dca1 | 1709 | struct net *net = dev_net(dev); |
1da177e4 LT |
1710 | |
1711 | switch (event) { | |
1712 | case NETDEV_CHANGEADDR: | |
1713 | neigh_changeaddr(&nd_tbl, dev); | |
5b7c931d | 1714 | fib6_run_gc(~0UL, net); |
1da177e4 LT |
1715 | break; |
1716 | case NETDEV_DOWN: | |
1717 | neigh_ifdown(&nd_tbl, dev); | |
5b7c931d | 1718 | fib6_run_gc(~0UL, net); |
1da177e4 LT |
1719 | break; |
1720 | default: | |
1721 | break; | |
1722 | } | |
1723 | ||
1724 | return NOTIFY_DONE; | |
1725 | } | |
1726 | ||
1727 | static struct notifier_block ndisc_netdev_notifier = { | |
1728 | .notifier_call = ndisc_netdev_event, | |
1729 | }; | |
1730 | ||
1731 | #ifdef CONFIG_SYSCTL | |
1732 | static void ndisc_warn_deprecated_sysctl(struct ctl_table *ctl, | |
1733 | const char *func, const char *dev_name) | |
1734 | { | |
1735 | static char warncomm[TASK_COMM_LEN]; | |
1736 | static int warned; | |
1737 | if (strcmp(warncomm, current->comm) && warned < 5) { | |
1738 | strcpy(warncomm, current->comm); | |
1739 | printk(KERN_WARNING | |
1740 | "process `%s' is using deprecated sysctl (%s) " | |
1741 | "net.ipv6.neigh.%s.%s; " | |
1742 | "Use net.ipv6.neigh.%s.%s_ms " | |
1743 | "instead.\n", | |
1744 | warncomm, func, | |
1745 | dev_name, ctl->procname, | |
1746 | dev_name, ctl->procname); | |
1747 | warned++; | |
1748 | } | |
1749 | } | |
1750 | ||
8d65af78 | 1751 | int ndisc_ifinfo_sysctl_change(struct ctl_table *ctl, int write, void __user *buffer, size_t *lenp, loff_t *ppos) |
1da177e4 LT |
1752 | { |
1753 | struct net_device *dev = ctl->extra1; | |
1754 | struct inet6_dev *idev; | |
1755 | int ret; | |
1756 | ||
d12af679 EB |
1757 | if ((strcmp(ctl->procname, "retrans_time") == 0) || |
1758 | (strcmp(ctl->procname, "base_reachable_time") == 0)) | |
1da177e4 LT |
1759 | ndisc_warn_deprecated_sysctl(ctl, "syscall", dev ? dev->name : "default"); |
1760 | ||
d12af679 | 1761 | if (strcmp(ctl->procname, "retrans_time") == 0) |
8d65af78 | 1762 | ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
d12af679 EB |
1763 | |
1764 | else if (strcmp(ctl->procname, "base_reachable_time") == 0) | |
1da177e4 | 1765 | ret = proc_dointvec_jiffies(ctl, write, |
8d65af78 | 1766 | buffer, lenp, ppos); |
d12af679 EB |
1767 | |
1768 | else if ((strcmp(ctl->procname, "retrans_time_ms") == 0) || | |
ad02ac14 | 1769 | (strcmp(ctl->procname, "base_reachable_time_ms") == 0)) |
1da177e4 | 1770 | ret = proc_dointvec_ms_jiffies(ctl, write, |
8d65af78 | 1771 | buffer, lenp, ppos); |
d12af679 | 1772 | else |
1da177e4 | 1773 | ret = -1; |
1da177e4 LT |
1774 | |
1775 | if (write && ret == 0 && dev && (idev = in6_dev_get(dev)) != NULL) { | |
d12af679 | 1776 | if (ctl->data == &idev->nd_parms->base_reachable_time) |
1da177e4 LT |
1777 | idev->nd_parms->reachable_time = neigh_rand_reach_time(idev->nd_parms->base_reachable_time); |
1778 | idev->tstamp = jiffies; | |
1779 | inet6_ifinfo_notify(RTM_NEWLINK, idev); | |
1780 | in6_dev_put(idev); | |
1781 | } | |
1782 | return ret; | |
1783 | } | |
1784 | ||
1da177e4 LT |
1785 | |
1786 | #endif | |
1787 | ||
2c8c1e72 | 1788 | static int __net_init ndisc_net_init(struct net *net) |
1da177e4 LT |
1789 | { |
1790 | struct ipv6_pinfo *np; | |
1791 | struct sock *sk; | |
1ab1457c | 1792 | int err; |
1da177e4 | 1793 | |
1ed8516f DL |
1794 | err = inet_ctl_sock_create(&sk, PF_INET6, |
1795 | SOCK_RAW, IPPROTO_ICMPV6, net); | |
1da177e4 LT |
1796 | if (err < 0) { |
1797 | ND_PRINTK0(KERN_ERR | |
1ab1457c | 1798 | "ICMPv6 NDISC: Failed to initialize the control socket (err %d).\n", |
1da177e4 | 1799 | err); |
1da177e4 LT |
1800 | return err; |
1801 | } | |
1802 | ||
1ed8516f | 1803 | net->ipv6.ndisc_sk = sk; |
1762f7e8 | 1804 | |
1da177e4 | 1805 | np = inet6_sk(sk); |
1da177e4 LT |
1806 | np->hop_limit = 255; |
1807 | /* Do not loopback ndisc messages */ | |
1808 | np->mc_loop = 0; | |
1da177e4 | 1809 | |
1762f7e8 DL |
1810 | return 0; |
1811 | } | |
1812 | ||
2c8c1e72 | 1813 | static void __net_exit ndisc_net_exit(struct net *net) |
1762f7e8 | 1814 | { |
1ed8516f | 1815 | inet_ctl_sock_destroy(net->ipv6.ndisc_sk); |
1762f7e8 DL |
1816 | } |
1817 | ||
1818 | static struct pernet_operations ndisc_net_ops = { | |
1819 | .init = ndisc_net_init, | |
1820 | .exit = ndisc_net_exit, | |
1821 | }; | |
1822 | ||
1823 | int __init ndisc_init(void) | |
1824 | { | |
1825 | int err; | |
1826 | ||
1827 | err = register_pernet_subsys(&ndisc_net_ops); | |
1828 | if (err) | |
1829 | return err; | |
1ab1457c YH |
1830 | /* |
1831 | * Initialize the neighbour table | |
1832 | */ | |
1da177e4 LT |
1833 | neigh_table_init(&nd_tbl); |
1834 | ||
1835 | #ifdef CONFIG_SYSCTL | |
54716e3b | 1836 | err = neigh_sysctl_register(NULL, &nd_tbl.parms, "ipv6", |
f8572d8f | 1837 | &ndisc_ifinfo_sysctl_change); |
1762f7e8 DL |
1838 | if (err) |
1839 | goto out_unregister_pernet; | |
1da177e4 | 1840 | #endif |
1762f7e8 DL |
1841 | err = register_netdevice_notifier(&ndisc_netdev_notifier); |
1842 | if (err) | |
1843 | goto out_unregister_sysctl; | |
1844 | out: | |
1845 | return err; | |
1da177e4 | 1846 | |
1762f7e8 DL |
1847 | out_unregister_sysctl: |
1848 | #ifdef CONFIG_SYSCTL | |
1849 | neigh_sysctl_unregister(&nd_tbl.parms); | |
1850 | out_unregister_pernet: | |
1851 | #endif | |
1852 | unregister_pernet_subsys(&ndisc_net_ops); | |
1853 | goto out; | |
1da177e4 LT |
1854 | } |
1855 | ||
1856 | void ndisc_cleanup(void) | |
1857 | { | |
36f73d0c | 1858 | unregister_netdevice_notifier(&ndisc_netdev_notifier); |
1da177e4 LT |
1859 | #ifdef CONFIG_SYSCTL |
1860 | neigh_sysctl_unregister(&nd_tbl.parms); | |
1861 | #endif | |
1862 | neigh_table_clear(&nd_tbl); | |
1762f7e8 | 1863 | unregister_pernet_subsys(&ndisc_net_ops); |
1da177e4 | 1864 | } |