Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Neighbour Discovery for IPv6 | |
1ab1457c | 3 | * Linux INET6 implementation |
1da177e4 LT |
4 | * |
5 | * Authors: | |
1ab1457c | 6 | * Pedro Roque <roque@di.fc.ul.pt> |
1da177e4 LT |
7 | * Mike Shaver <shaver@ingenia.com> |
8 | * | |
9 | * This program is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU General Public License | |
11 | * as published by the Free Software Foundation; either version | |
12 | * 2 of the License, or (at your option) any later version. | |
13 | */ | |
14 | ||
15 | /* | |
16 | * Changes: | |
17 | * | |
31910575 PY |
18 | * Pierre Ynard : export userland ND options |
19 | * through netlink (RDNSS support) | |
1da177e4 LT |
20 | * Lars Fenneberg : fixed MTU setting on receipt |
21 | * of an RA. | |
1da177e4 LT |
22 | * Janos Farkas : kmalloc failure checks |
23 | * Alexey Kuznetsov : state machine reworked | |
24 | * and moved to net/core. | |
25 | * Pekka Savola : RFC2461 validation | |
26 | * YOSHIFUJI Hideaki @USAGI : Verify ND options properly | |
27 | */ | |
28 | ||
29 | /* Set to 3 to get tracing... */ | |
30 | #define ND_DEBUG 1 | |
31 | ||
32 | #define ND_PRINTK(fmt, args...) do { if (net_ratelimit()) { printk(fmt, ## args); } } while(0) | |
33 | #define ND_NOPRINTK(x...) do { ; } while(0) | |
34 | #define ND_PRINTK0 ND_PRINTK | |
35 | #define ND_PRINTK1 ND_NOPRINTK | |
36 | #define ND_PRINTK2 ND_NOPRINTK | |
37 | #define ND_PRINTK3 ND_NOPRINTK | |
38 | #if ND_DEBUG >= 1 | |
39 | #undef ND_PRINTK1 | |
40 | #define ND_PRINTK1 ND_PRINTK | |
41 | #endif | |
42 | #if ND_DEBUG >= 2 | |
43 | #undef ND_PRINTK2 | |
44 | #define ND_PRINTK2 ND_PRINTK | |
45 | #endif | |
46 | #if ND_DEBUG >= 3 | |
47 | #undef ND_PRINTK3 | |
48 | #define ND_PRINTK3 ND_PRINTK | |
49 | #endif | |
50 | ||
51 | #include <linux/module.h> | |
1da177e4 LT |
52 | #include <linux/errno.h> |
53 | #include <linux/types.h> | |
54 | #include <linux/socket.h> | |
55 | #include <linux/sockios.h> | |
56 | #include <linux/sched.h> | |
57 | #include <linux/net.h> | |
58 | #include <linux/in6.h> | |
59 | #include <linux/route.h> | |
60 | #include <linux/init.h> | |
61 | #include <linux/rcupdate.h> | |
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, | |
1da177e4 LT |
110 | }; |
111 | ||
89d69d2b | 112 | static const struct neigh_ops ndisc_hh_ops = { |
1da177e4 LT |
113 | .family = AF_INET6, |
114 | .solicit = ndisc_solicit, | |
115 | .error_report = ndisc_error_report, | |
116 | .output = neigh_resolve_output, | |
117 | .connected_output = neigh_resolve_output, | |
1da177e4 LT |
118 | }; |
119 | ||
120 | ||
89d69d2b | 121 | static const struct neigh_ops ndisc_direct_ops = { |
1da177e4 | 122 | .family = AF_INET6, |
8f40b161 DM |
123 | .output = neigh_direct_output, |
124 | .connected_output = neigh_direct_output, | |
1da177e4 LT |
125 | }; |
126 | ||
127 | struct neigh_table nd_tbl = { | |
128 | .family = AF_INET6, | |
129 | .entry_size = sizeof(struct neighbour) + sizeof(struct in6_addr), | |
130 | .key_len = sizeof(struct in6_addr), | |
131 | .hash = ndisc_hash, | |
132 | .constructor = ndisc_constructor, | |
133 | .pconstructor = pndisc_constructor, | |
134 | .pdestructor = pndisc_destructor, | |
135 | .proxy_redo = pndisc_redo, | |
136 | .id = "ndisc_cache", | |
137 | .parms = { | |
b672083e SW |
138 | .tbl = &nd_tbl, |
139 | .base_reachable_time = ND_REACHABLE_TIME, | |
140 | .retrans_time = ND_RETRANS_TIMER, | |
141 | .gc_staletime = 60 * HZ, | |
142 | .reachable_time = ND_REACHABLE_TIME, | |
143 | .delay_probe_time = 5 * HZ, | |
8b5c171b | 144 | .queue_len_bytes = 64*1024, |
b672083e SW |
145 | .ucast_probes = 3, |
146 | .mcast_probes = 3, | |
147 | .anycast_delay = 1 * HZ, | |
148 | .proxy_delay = (8 * HZ) / 10, | |
149 | .proxy_qlen = 64, | |
1da177e4 LT |
150 | }, |
151 | .gc_interval = 30 * HZ, | |
152 | .gc_thresh1 = 128, | |
153 | .gc_thresh2 = 512, | |
154 | .gc_thresh3 = 1024, | |
155 | }; | |
156 | ||
157 | /* ND options */ | |
158 | struct ndisc_options { | |
70ceb4f5 YH |
159 | struct nd_opt_hdr *nd_opt_array[__ND_OPT_ARRAY_MAX]; |
160 | #ifdef CONFIG_IPV6_ROUTE_INFO | |
161 | struct nd_opt_hdr *nd_opts_ri; | |
162 | struct nd_opt_hdr *nd_opts_ri_end; | |
163 | #endif | |
31910575 PY |
164 | struct nd_opt_hdr *nd_useropts; |
165 | struct nd_opt_hdr *nd_useropts_end; | |
1da177e4 LT |
166 | }; |
167 | ||
168 | #define nd_opts_src_lladdr nd_opt_array[ND_OPT_SOURCE_LL_ADDR] | |
169 | #define nd_opts_tgt_lladdr nd_opt_array[ND_OPT_TARGET_LL_ADDR] | |
170 | #define nd_opts_pi nd_opt_array[ND_OPT_PREFIX_INFO] | |
171 | #define nd_opts_pi_end nd_opt_array[__ND_OPT_PREFIX_INFO_END] | |
172 | #define nd_opts_rh nd_opt_array[ND_OPT_REDIRECT_HDR] | |
173 | #define nd_opts_mtu nd_opt_array[ND_OPT_MTU] | |
174 | ||
175 | #define NDISC_OPT_SPACE(len) (((len)+2+7)&~7) | |
176 | ||
177 | /* | |
178 | * Return the padding between the option length and the start of the | |
179 | * link addr. Currently only IP-over-InfiniBand needs this, although | |
180 | * if RFC 3831 IPv6-over-Fibre Channel is ever implemented it may | |
181 | * also need a pad of 2. | |
182 | */ | |
183 | static int ndisc_addr_option_pad(unsigned short type) | |
184 | { | |
185 | switch (type) { | |
186 | case ARPHRD_INFINIBAND: return 2; | |
187 | default: return 0; | |
188 | } | |
189 | } | |
190 | ||
191 | static inline int ndisc_opt_addr_space(struct net_device *dev) | |
192 | { | |
193 | return NDISC_OPT_SPACE(dev->addr_len + ndisc_addr_option_pad(dev->type)); | |
194 | } | |
195 | ||
196 | static u8 *ndisc_fill_addr_option(u8 *opt, int type, void *data, int data_len, | |
197 | unsigned short addr_type) | |
198 | { | |
199 | int space = NDISC_OPT_SPACE(data_len); | |
200 | int pad = ndisc_addr_option_pad(addr_type); | |
201 | ||
202 | opt[0] = type; | |
203 | opt[1] = space>>3; | |
204 | ||
205 | memset(opt + 2, 0, pad); | |
206 | opt += pad; | |
207 | space -= pad; | |
208 | ||
209 | memcpy(opt+2, data, data_len); | |
210 | data_len += 2; | |
211 | opt += data_len; | |
212 | if ((space -= data_len) > 0) | |
213 | memset(opt, 0, space); | |
214 | return opt + space; | |
215 | } | |
216 | ||
217 | static struct nd_opt_hdr *ndisc_next_option(struct nd_opt_hdr *cur, | |
218 | struct nd_opt_hdr *end) | |
219 | { | |
220 | int type; | |
221 | if (!cur || !end || cur >= end) | |
222 | return NULL; | |
223 | type = cur->nd_opt_type; | |
224 | do { | |
225 | cur = ((void *)cur) + (cur->nd_opt_len << 3); | |
226 | } while(cur < end && cur->nd_opt_type != type); | |
a02cec21 | 227 | return cur <= end && cur->nd_opt_type == type ? cur : NULL; |
1da177e4 LT |
228 | } |
229 | ||
31910575 PY |
230 | static inline int ndisc_is_useropt(struct nd_opt_hdr *opt) |
231 | { | |
a02cec21 | 232 | return opt->nd_opt_type == ND_OPT_RDNSS; |
31910575 PY |
233 | } |
234 | ||
235 | static struct nd_opt_hdr *ndisc_next_useropt(struct nd_opt_hdr *cur, | |
236 | struct nd_opt_hdr *end) | |
237 | { | |
238 | if (!cur || !end || cur >= end) | |
239 | return NULL; | |
240 | do { | |
241 | cur = ((void *)cur) + (cur->nd_opt_len << 3); | |
242 | } while(cur < end && !ndisc_is_useropt(cur)); | |
a02cec21 | 243 | return cur <= end && ndisc_is_useropt(cur) ? cur : NULL; |
31910575 PY |
244 | } |
245 | ||
1da177e4 LT |
246 | static struct ndisc_options *ndisc_parse_options(u8 *opt, int opt_len, |
247 | struct ndisc_options *ndopts) | |
248 | { | |
249 | struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)opt; | |
250 | ||
251 | if (!nd_opt || opt_len < 0 || !ndopts) | |
252 | return NULL; | |
253 | memset(ndopts, 0, sizeof(*ndopts)); | |
254 | while (opt_len) { | |
255 | int l; | |
256 | if (opt_len < sizeof(struct nd_opt_hdr)) | |
257 | return NULL; | |
258 | l = nd_opt->nd_opt_len << 3; | |
259 | if (opt_len < l || l == 0) | |
260 | return NULL; | |
261 | switch (nd_opt->nd_opt_type) { | |
262 | case ND_OPT_SOURCE_LL_ADDR: | |
263 | case ND_OPT_TARGET_LL_ADDR: | |
264 | case ND_OPT_MTU: | |
265 | case ND_OPT_REDIRECT_HDR: | |
266 | if (ndopts->nd_opt_array[nd_opt->nd_opt_type]) { | |
267 | ND_PRINTK2(KERN_WARNING | |
268 | "%s(): duplicated ND6 option found: type=%d\n", | |
0dc47877 | 269 | __func__, |
1da177e4 LT |
270 | nd_opt->nd_opt_type); |
271 | } else { | |
272 | ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt; | |
273 | } | |
274 | break; | |
275 | case ND_OPT_PREFIX_INFO: | |
276 | ndopts->nd_opts_pi_end = nd_opt; | |
cfcabdcc | 277 | if (!ndopts->nd_opt_array[nd_opt->nd_opt_type]) |
1da177e4 LT |
278 | ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt; |
279 | break; | |
70ceb4f5 YH |
280 | #ifdef CONFIG_IPV6_ROUTE_INFO |
281 | case ND_OPT_ROUTE_INFO: | |
282 | ndopts->nd_opts_ri_end = nd_opt; | |
283 | if (!ndopts->nd_opts_ri) | |
284 | ndopts->nd_opts_ri = nd_opt; | |
285 | break; | |
286 | #endif | |
1da177e4 | 287 | default: |
31910575 PY |
288 | if (ndisc_is_useropt(nd_opt)) { |
289 | ndopts->nd_useropts_end = nd_opt; | |
290 | if (!ndopts->nd_useropts) | |
291 | ndopts->nd_useropts = nd_opt; | |
292 | } else { | |
293 | /* | |
294 | * Unknown options must be silently ignored, | |
295 | * to accommodate future extension to the | |
296 | * protocol. | |
297 | */ | |
298 | ND_PRINTK2(KERN_NOTICE | |
299 | "%s(): ignored unsupported option; type=%d, len=%d\n", | |
0dc47877 | 300 | __func__, |
31910575 PY |
301 | nd_opt->nd_opt_type, nd_opt->nd_opt_len); |
302 | } | |
1da177e4 LT |
303 | } |
304 | opt_len -= l; | |
305 | nd_opt = ((void *)nd_opt) + l; | |
306 | } | |
307 | return ndopts; | |
308 | } | |
309 | ||
310 | static inline u8 *ndisc_opt_addr_data(struct nd_opt_hdr *p, | |
311 | struct net_device *dev) | |
312 | { | |
313 | u8 *lladdr = (u8 *)(p + 1); | |
314 | int lladdrlen = p->nd_opt_len << 3; | |
315 | int prepad = ndisc_addr_option_pad(dev->type); | |
316 | if (lladdrlen != NDISC_OPT_SPACE(dev->addr_len + prepad)) | |
317 | return NULL; | |
a02cec21 | 318 | return lladdr + prepad; |
1da177e4 LT |
319 | } |
320 | ||
b71d1d42 | 321 | int ndisc_mc_map(const struct in6_addr *addr, char *buf, struct net_device *dev, int dir) |
1da177e4 LT |
322 | { |
323 | switch (dev->type) { | |
324 | case ARPHRD_ETHER: | |
325 | case ARPHRD_IEEE802: /* Not sure. Check it later. --ANK */ | |
326 | case ARPHRD_FDDI: | |
327 | ipv6_eth_mc_map(addr, buf); | |
328 | return 0; | |
329 | case ARPHRD_IEEE802_TR: | |
330 | ipv6_tr_mc_map(addr,buf); | |
331 | return 0; | |
332 | case ARPHRD_ARCNET: | |
333 | ipv6_arcnet_mc_map(addr, buf); | |
334 | return 0; | |
335 | case ARPHRD_INFINIBAND: | |
a9e527e3 | 336 | ipv6_ib_mc_map(addr, dev->broadcast, buf); |
1da177e4 | 337 | return 0; |
93ca3bb5 TT |
338 | case ARPHRD_IPGRE: |
339 | return ipv6_ipgre_mc_map(addr, dev->broadcast, buf); | |
1da177e4 LT |
340 | default: |
341 | if (dir) { | |
342 | memcpy(buf, dev->broadcast, dev->addr_len); | |
343 | return 0; | |
344 | } | |
345 | } | |
346 | return -EINVAL; | |
347 | } | |
348 | ||
7159039a YH |
349 | EXPORT_SYMBOL(ndisc_mc_map); |
350 | ||
d6bf7817 ED |
351 | static u32 ndisc_hash(const void *pkey, |
352 | const struct net_device *dev, | |
353 | __u32 hash_rnd) | |
1da177e4 LT |
354 | { |
355 | const u32 *p32 = pkey; | |
356 | u32 addr_hash, i; | |
357 | ||
358 | addr_hash = 0; | |
359 | for (i = 0; i < (sizeof(struct in6_addr) / sizeof(u32)); i++) | |
360 | addr_hash ^= *p32++; | |
361 | ||
d6bf7817 | 362 | return jhash_2words(addr_hash, dev->ifindex, hash_rnd); |
1da177e4 LT |
363 | } |
364 | ||
365 | static int ndisc_constructor(struct neighbour *neigh) | |
366 | { | |
367 | struct in6_addr *addr = (struct in6_addr*)&neigh->primary_key; | |
368 | struct net_device *dev = neigh->dev; | |
369 | struct inet6_dev *in6_dev; | |
370 | struct neigh_parms *parms; | |
371 | int is_multicast = ipv6_addr_is_multicast(addr); | |
372 | ||
1da177e4 LT |
373 | in6_dev = in6_dev_get(dev); |
374 | if (in6_dev == NULL) { | |
1da177e4 LT |
375 | return -EINVAL; |
376 | } | |
377 | ||
378 | parms = in6_dev->nd_parms; | |
379 | __neigh_parms_put(neigh->parms); | |
380 | neigh->parms = neigh_parms_clone(parms); | |
1da177e4 LT |
381 | |
382 | neigh->type = is_multicast ? RTN_MULTICAST : RTN_UNICAST; | |
3b04ddde | 383 | if (!dev->header_ops) { |
1da177e4 LT |
384 | neigh->nud_state = NUD_NOARP; |
385 | neigh->ops = &ndisc_direct_ops; | |
8f40b161 | 386 | neigh->output = neigh_direct_output; |
1da177e4 LT |
387 | } else { |
388 | if (is_multicast) { | |
389 | neigh->nud_state = NUD_NOARP; | |
390 | ndisc_mc_map(addr, neigh->ha, dev, 1); | |
391 | } else if (dev->flags&(IFF_NOARP|IFF_LOOPBACK)) { | |
392 | neigh->nud_state = NUD_NOARP; | |
393 | memcpy(neigh->ha, dev->dev_addr, dev->addr_len); | |
394 | if (dev->flags&IFF_LOOPBACK) | |
395 | neigh->type = RTN_LOCAL; | |
396 | } else if (dev->flags&IFF_POINTOPOINT) { | |
397 | neigh->nud_state = NUD_NOARP; | |
398 | memcpy(neigh->ha, dev->broadcast, dev->addr_len); | |
399 | } | |
3b04ddde | 400 | if (dev->header_ops->cache) |
1da177e4 LT |
401 | neigh->ops = &ndisc_hh_ops; |
402 | else | |
403 | neigh->ops = &ndisc_generic_ops; | |
404 | if (neigh->nud_state&NUD_VALID) | |
405 | neigh->output = neigh->ops->connected_output; | |
406 | else | |
407 | neigh->output = neigh->ops->output; | |
408 | } | |
409 | in6_dev_put(in6_dev); | |
410 | return 0; | |
411 | } | |
412 | ||
413 | static int pndisc_constructor(struct pneigh_entry *n) | |
414 | { | |
415 | struct in6_addr *addr = (struct in6_addr*)&n->key; | |
416 | struct in6_addr maddr; | |
417 | struct net_device *dev = n->dev; | |
418 | ||
419 | if (dev == NULL || __in6_dev_get(dev) == NULL) | |
420 | return -EINVAL; | |
421 | addrconf_addr_solict_mult(addr, &maddr); | |
422 | ipv6_dev_mc_inc(dev, &maddr); | |
423 | return 0; | |
424 | } | |
425 | ||
426 | static void pndisc_destructor(struct pneigh_entry *n) | |
427 | { | |
428 | struct in6_addr *addr = (struct in6_addr*)&n->key; | |
429 | struct in6_addr maddr; | |
430 | struct net_device *dev = n->dev; | |
431 | ||
432 | if (dev == NULL || __in6_dev_get(dev) == NULL) | |
433 | return; | |
434 | addrconf_addr_solict_mult(addr, &maddr); | |
435 | ipv6_dev_mc_dec(dev, &maddr); | |
436 | } | |
437 | ||
305d552a BH |
438 | struct sk_buff *ndisc_build_skb(struct net_device *dev, |
439 | const struct in6_addr *daddr, | |
440 | const struct in6_addr *saddr, | |
441 | struct icmp6hdr *icmp6h, | |
442 | const struct in6_addr *target, | |
443 | int llinfo) | |
1da177e4 | 444 | { |
c346dca1 | 445 | struct net *net = dev_net(dev); |
1762f7e8 | 446 | struct sock *sk = net->ipv6.ndisc_sk; |
1ab1457c | 447 | struct sk_buff *skb; |
e1ec7842 | 448 | struct icmp6hdr *hdr; |
a7ae1992 HX |
449 | int hlen = LL_RESERVED_SPACE(dev); |
450 | int tlen = dev->needed_tailroom; | |
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) + | |
a7ae1992 | 464 | len + hlen + tlen), |
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 | ||
a7ae1992 | 473 | skb_reserve(skb, hlen); |
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 | { | |
4c9483b2 | 509 | struct flowi6 fl6; |
305d552a BH |
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 | ||
4c9483b2 | 519 | icmpv6_flow_init(sk, &fl6, type, saddr, daddr, dev->ifindex); |
305d552a BH |
520 | |
521 | dst = icmp6_dst_alloc(dev, neigh, daddr); | |
522 | if (!dst) { | |
523 | kfree_skb(skb); | |
524 | return; | |
525 | } | |
526 | ||
4c9483b2 | 527 | dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), NULL, 0); |
452edd59 | 528 | if (IS_ERR(dst)) { |
305d552a BH |
529 | kfree_skb(skb); |
530 | return; | |
531 | } | |
532 | ||
adf30907 | 533 | skb_dst_set(skb, dst); |
e1ec7842 | 534 | |
cfdf7647 ED |
535 | rcu_read_lock(); |
536 | idev = __in6_dev_get(dst->dev); | |
edf391ff | 537 | IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len); |
e1ec7842 | 538 | |
b2e0b385 | 539 | err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, dst->dev, |
6e23ae2a | 540 | dst_output); |
1da177e4 | 541 | if (!err) { |
5c5d244b | 542 | ICMP6MSGOUT_INC_STATS(net, idev, type); |
a862f6a6 | 543 | ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); |
1da177e4 LT |
544 | } |
545 | ||
cfdf7647 | 546 | rcu_read_unlock(); |
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; | |
9f888160 | 588 | inc_opt |= ifp->idev->cnf.force_tllao; |
e1ec7842 YH |
589 | in6_ifa_put(ifp); |
590 | } else { | |
191cd582 | 591 | if (ipv6_dev_get_saddr(dev_net(dev), dev, daddr, |
c346dca1 | 592 | inet6_sk(dev_net(dev)->ipv6.ndisc_sk)->srcprefs, |
7cbca67c | 593 | &tmpaddr)) |
e1ec7842 YH |
594 | return; |
595 | src_addr = &tmpaddr; | |
596 | } | |
597 | ||
598 | icmp6h.icmp6_router = router; | |
599 | icmp6h.icmp6_solicited = solicited; | |
600 | icmp6h.icmp6_override = override; | |
601 | ||
602 | __ndisc_send(dev, neigh, daddr, src_addr, | |
603 | &icmp6h, solicited_addr, | |
14878f75 | 604 | inc_opt ? ND_OPT_TARGET_LL_ADDR : 0); |
e1ec7842 YH |
605 | } |
606 | ||
f47b9464 BH |
607 | static void ndisc_send_unsol_na(struct net_device *dev) |
608 | { | |
609 | struct inet6_dev *idev; | |
610 | struct inet6_ifaddr *ifa; | |
611 | struct in6_addr mcaddr; | |
612 | ||
613 | idev = in6_dev_get(dev); | |
614 | if (!idev) | |
615 | return; | |
616 | ||
617 | read_lock_bh(&idev->lock); | |
618 | list_for_each_entry(ifa, &idev->addr_list, if_list) { | |
619 | addrconf_addr_solict_mult(&ifa->addr, &mcaddr); | |
620 | ndisc_send_na(dev, NULL, &mcaddr, &ifa->addr, | |
621 | /*router=*/ !!idev->cnf.forwarding, | |
622 | /*solicited=*/ false, /*override=*/ true, | |
623 | /*inc_opt=*/ true); | |
624 | } | |
625 | read_unlock_bh(&idev->lock); | |
626 | ||
627 | in6_dev_put(idev); | |
628 | } | |
629 | ||
1da177e4 | 630 | void ndisc_send_ns(struct net_device *dev, struct neighbour *neigh, |
9acd9f3a YH |
631 | const struct in6_addr *solicit, |
632 | const struct in6_addr *daddr, const struct in6_addr *saddr) | |
1da177e4 | 633 | { |
1da177e4 | 634 | struct in6_addr addr_buf; |
e1ec7842 YH |
635 | struct icmp6hdr icmp6h = { |
636 | .icmp6_type = NDISC_NEIGHBOUR_SOLICITATION, | |
637 | }; | |
1da177e4 LT |
638 | |
639 | if (saddr == NULL) { | |
95c385b4 NH |
640 | if (ipv6_get_lladdr(dev, &addr_buf, |
641 | (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC))) | |
1da177e4 LT |
642 | return; |
643 | saddr = &addr_buf; | |
644 | } | |
645 | ||
e1ec7842 YH |
646 | __ndisc_send(dev, neigh, daddr, saddr, |
647 | &icmp6h, solicit, | |
14878f75 | 648 | !ipv6_addr_any(saddr) ? ND_OPT_SOURCE_LL_ADDR : 0); |
1da177e4 LT |
649 | } |
650 | ||
9acd9f3a YH |
651 | void ndisc_send_rs(struct net_device *dev, const struct in6_addr *saddr, |
652 | const struct in6_addr *daddr) | |
1da177e4 | 653 | { |
e1ec7842 YH |
654 | struct icmp6hdr icmp6h = { |
655 | .icmp6_type = NDISC_ROUTER_SOLICITATION, | |
656 | }; | |
95c385b4 | 657 | int send_sllao = dev->addr_len; |
95c385b4 NH |
658 | |
659 | #ifdef CONFIG_IPV6_OPTIMISTIC_DAD | |
660 | /* | |
661 | * According to section 2.2 of RFC 4429, we must not | |
662 | * send router solicitations with a sllao from | |
663 | * optimistic addresses, but we may send the solicitation | |
664 | * if we don't include the sllao. So here we check | |
665 | * if our address is optimistic, and if so, we | |
bea85195 | 666 | * suppress the inclusion of the sllao. |
95c385b4 NH |
667 | */ |
668 | if (send_sllao) { | |
c346dca1 | 669 | struct inet6_ifaddr *ifp = ipv6_get_ifaddr(dev_net(dev), saddr, |
1cab3da6 | 670 | dev, 1); |
95c385b4 NH |
671 | if (ifp) { |
672 | if (ifp->flags & IFA_F_OPTIMISTIC) { | |
ca043569 | 673 | send_sllao = 0; |
95c385b4 | 674 | } |
ca043569 | 675 | in6_ifa_put(ifp); |
95c385b4 NH |
676 | } else { |
677 | send_sllao = 0; | |
678 | } | |
679 | } | |
680 | #endif | |
e1ec7842 YH |
681 | __ndisc_send(dev, NULL, daddr, saddr, |
682 | &icmp6h, NULL, | |
14878f75 | 683 | send_sllao ? ND_OPT_SOURCE_LL_ADDR : 0); |
1da177e4 | 684 | } |
1ab1457c | 685 | |
1da177e4 LT |
686 | |
687 | static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb) | |
688 | { | |
689 | /* | |
690 | * "The sender MUST return an ICMP | |
691 | * destination unreachable" | |
692 | */ | |
693 | dst_link_failure(skb); | |
694 | kfree_skb(skb); | |
695 | } | |
696 | ||
697 | /* Called with locked neigh: either read or both */ | |
698 | ||
699 | static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb) | |
700 | { | |
701 | struct in6_addr *saddr = NULL; | |
702 | struct in6_addr mcaddr; | |
703 | struct net_device *dev = neigh->dev; | |
704 | struct in6_addr *target = (struct in6_addr *)&neigh->primary_key; | |
705 | int probes = atomic_read(&neigh->probes); | |
706 | ||
c346dca1 | 707 | if (skb && ipv6_chk_addr(dev_net(dev), &ipv6_hdr(skb)->saddr, dev, 1)) |
0660e03f | 708 | saddr = &ipv6_hdr(skb)->saddr; |
1da177e4 LT |
709 | |
710 | if ((probes -= neigh->parms->ucast_probes) < 0) { | |
711 | if (!(neigh->nud_state & NUD_VALID)) { | |
5b095d98 | 712 | ND_PRINTK1(KERN_DEBUG "%s(): trying to ucast probe in NUD_INVALID: %pI6\n", |
0c6ce78a | 713 | __func__, target); |
1da177e4 LT |
714 | } |
715 | ndisc_send_ns(dev, neigh, target, target, saddr); | |
716 | } else if ((probes -= neigh->parms->app_probes) < 0) { | |
717 | #ifdef CONFIG_ARPD | |
718 | neigh_app_ns(neigh); | |
719 | #endif | |
720 | } else { | |
721 | addrconf_addr_solict_mult(target, &mcaddr); | |
722 | ndisc_send_ns(dev, NULL, target, &mcaddr, saddr); | |
723 | } | |
724 | } | |
725 | ||
0736ffc0 YH |
726 | static int pndisc_is_router(const void *pkey, |
727 | struct net_device *dev) | |
fa86d322 PE |
728 | { |
729 | struct pneigh_entry *n; | |
0736ffc0 | 730 | int ret = -1; |
fa86d322 PE |
731 | |
732 | read_lock_bh(&nd_tbl.lock); | |
0736ffc0 YH |
733 | n = __pneigh_lookup(&nd_tbl, dev_net(dev), pkey, dev); |
734 | if (n) | |
735 | ret = !!(n->flags & NTF_ROUTER); | |
fa86d322 PE |
736 | read_unlock_bh(&nd_tbl.lock); |
737 | ||
0736ffc0 | 738 | return ret; |
fa86d322 PE |
739 | } |
740 | ||
1da177e4 LT |
741 | static void ndisc_recv_ns(struct sk_buff *skb) |
742 | { | |
9c70220b | 743 | struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb); |
b71d1d42 ED |
744 | const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; |
745 | const struct in6_addr *daddr = &ipv6_hdr(skb)->daddr; | |
1da177e4 | 746 | u8 *lladdr = NULL; |
27a884dc ACM |
747 | u32 ndoptlen = skb->tail - (skb->transport_header + |
748 | offsetof(struct nd_msg, opt)); | |
1da177e4 LT |
749 | struct ndisc_options ndopts; |
750 | struct net_device *dev = skb->dev; | |
751 | struct inet6_ifaddr *ifp; | |
752 | struct inet6_dev *idev = NULL; | |
753 | struct neighbour *neigh; | |
754 | int dad = ipv6_addr_any(saddr); | |
755 | int inc; | |
0736ffc0 | 756 | int is_router = -1; |
1da177e4 LT |
757 | |
758 | if (ipv6_addr_is_multicast(&msg->target)) { | |
1ab1457c | 759 | ND_PRINTK2(KERN_WARNING |
1da177e4 LT |
760 | "ICMPv6 NS: multicast target address"); |
761 | return; | |
762 | } | |
763 | ||
764 | /* | |
765 | * RFC2461 7.1.1: | |
766 | * DAD has to be destined for solicited node multicast address. | |
767 | */ | |
768 | if (dad && | |
769 | !(daddr->s6_addr32[0] == htonl(0xff020000) && | |
770 | daddr->s6_addr32[1] == htonl(0x00000000) && | |
771 | daddr->s6_addr32[2] == htonl(0x00000001) && | |
772 | daddr->s6_addr [12] == 0xff )) { | |
773 | ND_PRINTK2(KERN_WARNING | |
774 | "ICMPv6 NS: bad DAD packet (wrong destination)\n"); | |
775 | return; | |
776 | } | |
777 | ||
778 | if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) { | |
1ab1457c | 779 | ND_PRINTK2(KERN_WARNING |
1da177e4 LT |
780 | "ICMPv6 NS: invalid ND options\n"); |
781 | return; | |
782 | } | |
783 | ||
784 | if (ndopts.nd_opts_src_lladdr) { | |
785 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, dev); | |
786 | if (!lladdr) { | |
787 | ND_PRINTK2(KERN_WARNING | |
788 | "ICMPv6 NS: invalid link-layer address length\n"); | |
789 | return; | |
790 | } | |
791 | ||
792 | /* RFC2461 7.1.1: | |
1ab1457c YH |
793 | * If the IP source address is the unspecified address, |
794 | * there MUST NOT be source link-layer address option | |
1da177e4 LT |
795 | * in the message. |
796 | */ | |
797 | if (dad) { | |
1ab1457c | 798 | ND_PRINTK2(KERN_WARNING |
1da177e4 LT |
799 | "ICMPv6 NS: bad DAD packet (link-layer address option)\n"); |
800 | return; | |
801 | } | |
802 | } | |
803 | ||
804 | inc = ipv6_addr_is_multicast(daddr); | |
805 | ||
c346dca1 | 806 | ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1); |
a18bc695 | 807 | if (ifp) { |
95c385b4 NH |
808 | |
809 | if (ifp->flags & (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC)) { | |
810 | if (dad) { | |
811 | if (dev->type == ARPHRD_IEEE802_TR) { | |
98e399f8 ACM |
812 | const unsigned char *sadr; |
813 | sadr = skb_mac_header(skb); | |
95c385b4 NH |
814 | if (((sadr[8] ^ dev->dev_addr[0]) & 0x7f) == 0 && |
815 | sadr[9] == dev->dev_addr[1] && | |
816 | sadr[10] == dev->dev_addr[2] && | |
817 | sadr[11] == dev->dev_addr[3] && | |
818 | sadr[12] == dev->dev_addr[4] && | |
819 | sadr[13] == dev->dev_addr[5]) { | |
820 | /* looped-back to us */ | |
821 | goto out; | |
822 | } | |
823 | } | |
824 | ||
825 | /* | |
826 | * We are colliding with another node | |
827 | * who is doing DAD | |
828 | * so fail our DAD process | |
829 | */ | |
830 | addrconf_dad_failure(ifp); | |
9e3be4b3 | 831 | return; |
95c385b4 NH |
832 | } else { |
833 | /* | |
834 | * This is not a dad solicitation. | |
835 | * If we are an optimistic node, | |
836 | * we should respond. | |
837 | * Otherwise, we should ignore it. | |
838 | */ | |
839 | if (!(ifp->flags & IFA_F_OPTIMISTIC)) | |
1da177e4 | 840 | goto out; |
1da177e4 | 841 | } |
1da177e4 LT |
842 | } |
843 | ||
844 | idev = ifp->idev; | |
845 | } else { | |
53b7997f YH |
846 | struct net *net = dev_net(dev); |
847 | ||
1da177e4 LT |
848 | idev = in6_dev_get(dev); |
849 | if (!idev) { | |
850 | /* XXX: count this drop? */ | |
851 | return; | |
852 | } | |
853 | ||
53b7997f | 854 | if (ipv6_chk_acast_addr(net, dev, &msg->target) || |
1ab1457c | 855 | (idev->cnf.forwarding && |
53b7997f | 856 | (net->ipv6.devconf_all->proxy_ndp || idev->cnf.proxy_ndp) && |
0736ffc0 | 857 | (is_router = pndisc_is_router(&msg->target, dev)) >= 0)) { |
a61bbcf2 | 858 | if (!(NEIGH_CB(skb)->flags & LOCALLY_ENQUEUED) && |
1da177e4 LT |
859 | skb->pkt_type != PACKET_HOST && |
860 | inc != 0 && | |
861 | idev->nd_parms->proxy_delay != 0) { | |
862 | /* | |
863 | * for anycast or proxy, | |
1ab1457c YH |
864 | * sender should delay its response |
865 | * by a random time between 0 and | |
1da177e4 LT |
866 | * MAX_ANYCAST_DELAY_TIME seconds. |
867 | * (RFC2461) -- yoshfuji | |
868 | */ | |
869 | struct sk_buff *n = skb_clone(skb, GFP_ATOMIC); | |
870 | if (n) | |
871 | pneigh_enqueue(&nd_tbl, idev->nd_parms, n); | |
872 | goto out; | |
873 | } | |
874 | } else | |
875 | goto out; | |
876 | } | |
877 | ||
0736ffc0 YH |
878 | if (is_router < 0) |
879 | is_router = !!idev->cnf.forwarding; | |
62dd9318 | 880 | |
1da177e4 | 881 | if (dad) { |
f3ee4010 | 882 | ndisc_send_na(dev, NULL, &in6addr_linklocal_allnodes, &msg->target, |
62dd9318 | 883 | is_router, 0, (ifp != NULL), 1); |
1da177e4 LT |
884 | goto out; |
885 | } | |
886 | ||
887 | if (inc) | |
888 | NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_mcast); | |
889 | else | |
890 | NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_ucast); | |
891 | ||
1ab1457c | 892 | /* |
1da177e4 LT |
893 | * update / create cache entry |
894 | * for the source address | |
895 | */ | |
896 | neigh = __neigh_lookup(&nd_tbl, saddr, dev, | |
897 | !inc || lladdr || !dev->addr_len); | |
898 | if (neigh) | |
1ab1457c | 899 | neigh_update(neigh, lladdr, NUD_STALE, |
1da177e4 LT |
900 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
901 | NEIGH_UPDATE_F_OVERRIDE); | |
3b04ddde | 902 | if (neigh || !dev->header_ops) { |
1da177e4 | 903 | ndisc_send_na(dev, neigh, saddr, &msg->target, |
62dd9318 | 904 | is_router, |
1da177e4 LT |
905 | 1, (ifp != NULL && inc), inc); |
906 | if (neigh) | |
907 | neigh_release(neigh); | |
908 | } | |
909 | ||
910 | out: | |
911 | if (ifp) | |
912 | in6_ifa_put(ifp); | |
913 | else | |
914 | in6_dev_put(idev); | |
1da177e4 LT |
915 | } |
916 | ||
917 | static void ndisc_recv_na(struct sk_buff *skb) | |
918 | { | |
9c70220b | 919 | struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb); |
b71d1d42 ED |
920 | const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; |
921 | const struct in6_addr *daddr = &ipv6_hdr(skb)->daddr; | |
1da177e4 | 922 | u8 *lladdr = NULL; |
27a884dc ACM |
923 | u32 ndoptlen = skb->tail - (skb->transport_header + |
924 | offsetof(struct nd_msg, opt)); | |
1da177e4 LT |
925 | struct ndisc_options ndopts; |
926 | struct net_device *dev = skb->dev; | |
927 | struct inet6_ifaddr *ifp; | |
928 | struct neighbour *neigh; | |
929 | ||
930 | if (skb->len < sizeof(struct nd_msg)) { | |
931 | ND_PRINTK2(KERN_WARNING | |
932 | "ICMPv6 NA: packet too short\n"); | |
933 | return; | |
934 | } | |
935 | ||
936 | if (ipv6_addr_is_multicast(&msg->target)) { | |
937 | ND_PRINTK2(KERN_WARNING | |
938 | "ICMPv6 NA: target address is multicast.\n"); | |
939 | return; | |
940 | } | |
941 | ||
942 | if (ipv6_addr_is_multicast(daddr) && | |
943 | msg->icmph.icmp6_solicited) { | |
944 | ND_PRINTK2(KERN_WARNING | |
945 | "ICMPv6 NA: solicited NA is multicasted.\n"); | |
946 | return; | |
947 | } | |
1ab1457c | 948 | |
1da177e4 LT |
949 | if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) { |
950 | ND_PRINTK2(KERN_WARNING | |
951 | "ICMPv6 NS: invalid ND option\n"); | |
952 | return; | |
953 | } | |
954 | if (ndopts.nd_opts_tgt_lladdr) { | |
955 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, dev); | |
956 | if (!lladdr) { | |
957 | ND_PRINTK2(KERN_WARNING | |
958 | "ICMPv6 NA: invalid link-layer address length\n"); | |
959 | return; | |
960 | } | |
961 | } | |
c346dca1 | 962 | ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1); |
a18bc695 | 963 | if (ifp) { |
bd015928 DW |
964 | if (skb->pkt_type != PACKET_LOOPBACK |
965 | && (ifp->flags & IFA_F_TENTATIVE)) { | |
966 | addrconf_dad_failure(ifp); | |
967 | return; | |
1da177e4 LT |
968 | } |
969 | /* What should we make now? The advertisement | |
970 | is invalid, but ndisc specs say nothing | |
971 | about it. It could be misconfiguration, or | |
972 | an smart proxy agent tries to help us :-) | |
24fc7b86 JS |
973 | |
974 | We should not print the error if NA has been | |
975 | received from loopback - it is just our own | |
976 | unsolicited advertisement. | |
1da177e4 | 977 | */ |
24fc7b86 JS |
978 | if (skb->pkt_type != PACKET_LOOPBACK) |
979 | ND_PRINTK1(KERN_WARNING | |
a6fa3286 JR |
980 | "ICMPv6 NA: someone advertises our address %pI6 on %s!\n", |
981 | &ifp->addr, ifp->idev->dev->name); | |
1da177e4 LT |
982 | in6_ifa_put(ifp); |
983 | return; | |
984 | } | |
985 | neigh = neigh_lookup(&nd_tbl, &msg->target, dev); | |
986 | ||
987 | if (neigh) { | |
988 | u8 old_flags = neigh->flags; | |
53b7997f | 989 | struct net *net = dev_net(dev); |
1da177e4 LT |
990 | |
991 | if (neigh->nud_state & NUD_FAILED) | |
992 | goto out; | |
993 | ||
5f3e6e9e VN |
994 | /* |
995 | * Don't update the neighbor cache entry on a proxy NA from | |
996 | * ourselves because either the proxied node is off link or it | |
997 | * has already sent a NA to us. | |
998 | */ | |
999 | if (lladdr && !memcmp(lladdr, dev->dev_addr, dev->addr_len) && | |
53b7997f YH |
1000 | net->ipv6.devconf_all->forwarding && net->ipv6.devconf_all->proxy_ndp && |
1001 | pneigh_lookup(&nd_tbl, net, &msg->target, dev, 0)) { | |
fbea49e1 | 1002 | /* XXX: idev->cnf.prixy_ndp */ |
5f3e6e9e | 1003 | goto out; |
fbea49e1 | 1004 | } |
5f3e6e9e | 1005 | |
1da177e4 LT |
1006 | neigh_update(neigh, lladdr, |
1007 | msg->icmph.icmp6_solicited ? NUD_REACHABLE : NUD_STALE, | |
1008 | NEIGH_UPDATE_F_WEAK_OVERRIDE| | |
1009 | (msg->icmph.icmp6_override ? NEIGH_UPDATE_F_OVERRIDE : 0)| | |
1010 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
1011 | (msg->icmph.icmp6_router ? NEIGH_UPDATE_F_ISROUTER : 0)); | |
1012 | ||
1013 | if ((old_flags & ~neigh->flags) & NTF_ROUTER) { | |
1014 | /* | |
1015 | * Change: router to host | |
1016 | */ | |
1017 | struct rt6_info *rt; | |
1018 | rt = rt6_get_dflt_router(saddr, dev); | |
1019 | if (rt) | |
e0a1ad73 | 1020 | ip6_del_rt(rt); |
1da177e4 LT |
1021 | } |
1022 | ||
1023 | out: | |
1024 | neigh_release(neigh); | |
1025 | } | |
1026 | } | |
1027 | ||
1028 | static void ndisc_recv_rs(struct sk_buff *skb) | |
1029 | { | |
9c70220b | 1030 | struct rs_msg *rs_msg = (struct rs_msg *)skb_transport_header(skb); |
1da177e4 LT |
1031 | unsigned long ndoptlen = skb->len - sizeof(*rs_msg); |
1032 | struct neighbour *neigh; | |
1033 | struct inet6_dev *idev; | |
b71d1d42 | 1034 | const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; |
1da177e4 LT |
1035 | struct ndisc_options ndopts; |
1036 | u8 *lladdr = NULL; | |
1037 | ||
1038 | if (skb->len < sizeof(*rs_msg)) | |
1039 | return; | |
1040 | ||
cfdf7647 | 1041 | idev = __in6_dev_get(skb->dev); |
1da177e4 LT |
1042 | if (!idev) { |
1043 | if (net_ratelimit()) | |
1044 | ND_PRINTK1("ICMP6 RS: can't find in6 device\n"); | |
1045 | return; | |
1046 | } | |
1047 | ||
1048 | /* Don't accept RS if we're not in router mode */ | |
1049 | if (!idev->cnf.forwarding) | |
1050 | goto out; | |
1051 | ||
1052 | /* | |
1053 | * Don't update NCE if src = ::; | |
1054 | * this implies that the source node has no ip address assigned yet. | |
1055 | */ | |
1056 | if (ipv6_addr_any(saddr)) | |
1057 | goto out; | |
1058 | ||
1059 | /* Parse ND options */ | |
1060 | if (!ndisc_parse_options(rs_msg->opt, ndoptlen, &ndopts)) { | |
1061 | if (net_ratelimit()) | |
1062 | ND_PRINTK2("ICMP6 NS: invalid ND option, ignored\n"); | |
1063 | goto out; | |
1064 | } | |
1065 | ||
1066 | if (ndopts.nd_opts_src_lladdr) { | |
1067 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, | |
1068 | skb->dev); | |
1069 | if (!lladdr) | |
1070 | goto out; | |
1071 | } | |
1072 | ||
1073 | neigh = __neigh_lookup(&nd_tbl, saddr, skb->dev, 1); | |
1074 | if (neigh) { | |
1075 | neigh_update(neigh, lladdr, NUD_STALE, | |
1076 | NEIGH_UPDATE_F_WEAK_OVERRIDE| | |
1077 | NEIGH_UPDATE_F_OVERRIDE| | |
1078 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER); | |
1079 | neigh_release(neigh); | |
1080 | } | |
1081 | out: | |
cfdf7647 | 1082 | return; |
1da177e4 LT |
1083 | } |
1084 | ||
31910575 PY |
1085 | static void ndisc_ra_useropt(struct sk_buff *ra, struct nd_opt_hdr *opt) |
1086 | { | |
1087 | struct icmp6hdr *icmp6h = (struct icmp6hdr *)skb_transport_header(ra); | |
1088 | struct sk_buff *skb; | |
1089 | struct nlmsghdr *nlh; | |
1090 | struct nduseroptmsg *ndmsg; | |
c346dca1 | 1091 | struct net *net = dev_net(ra->dev); |
31910575 PY |
1092 | int err; |
1093 | int base_size = NLMSG_ALIGN(sizeof(struct nduseroptmsg) | |
1094 | + (opt->nd_opt_len << 3)); | |
1095 | size_t msg_size = base_size + nla_total_size(sizeof(struct in6_addr)); | |
1096 | ||
1097 | skb = nlmsg_new(msg_size, GFP_ATOMIC); | |
1098 | if (skb == NULL) { | |
1099 | err = -ENOBUFS; | |
1100 | goto errout; | |
1101 | } | |
1102 | ||
1103 | nlh = nlmsg_put(skb, 0, 0, RTM_NEWNDUSEROPT, base_size, 0); | |
1104 | if (nlh == NULL) { | |
1105 | goto nla_put_failure; | |
1106 | } | |
1107 | ||
1108 | ndmsg = nlmsg_data(nlh); | |
1109 | ndmsg->nduseropt_family = AF_INET6; | |
dbb2ed24 | 1110 | ndmsg->nduseropt_ifindex = ra->dev->ifindex; |
31910575 PY |
1111 | ndmsg->nduseropt_icmp_type = icmp6h->icmp6_type; |
1112 | ndmsg->nduseropt_icmp_code = icmp6h->icmp6_code; | |
1113 | ndmsg->nduseropt_opts_len = opt->nd_opt_len << 3; | |
1114 | ||
1115 | memcpy(ndmsg + 1, opt, opt->nd_opt_len << 3); | |
1116 | ||
1117 | NLA_PUT(skb, NDUSEROPT_SRCADDR, sizeof(struct in6_addr), | |
1118 | &ipv6_hdr(ra)->saddr); | |
1119 | nlmsg_end(skb, nlh); | |
1120 | ||
1ce85fe4 | 1121 | rtnl_notify(skb, net, 0, RTNLGRP_ND_USEROPT, NULL, GFP_ATOMIC); |
31910575 PY |
1122 | return; |
1123 | ||
1124 | nla_put_failure: | |
1125 | nlmsg_free(skb); | |
1126 | err = -EMSGSIZE; | |
1127 | errout: | |
a18bc695 | 1128 | rtnl_set_sk_err(net, RTNLGRP_ND_USEROPT, err); |
31910575 PY |
1129 | } |
1130 | ||
65e9b62d TG |
1131 | static inline int accept_ra(struct inet6_dev *in6_dev) |
1132 | { | |
1133 | /* | |
1134 | * If forwarding is enabled, RA are not accepted unless the special | |
1135 | * hybrid mode (accept_ra=2) is enabled. | |
1136 | */ | |
1137 | if (in6_dev->cnf.forwarding && in6_dev->cnf.accept_ra < 2) | |
1138 | return 0; | |
1139 | ||
1140 | return in6_dev->cnf.accept_ra; | |
1141 | } | |
1142 | ||
1da177e4 LT |
1143 | static void ndisc_router_discovery(struct sk_buff *skb) |
1144 | { | |
9c70220b | 1145 | struct ra_msg *ra_msg = (struct ra_msg *)skb_transport_header(skb); |
1da177e4 LT |
1146 | struct neighbour *neigh = NULL; |
1147 | struct inet6_dev *in6_dev; | |
65f5c7c1 | 1148 | struct rt6_info *rt = NULL; |
1da177e4 LT |
1149 | int lifetime; |
1150 | struct ndisc_options ndopts; | |
1151 | int optlen; | |
ebacaaa0 | 1152 | unsigned int pref = 0; |
1da177e4 LT |
1153 | |
1154 | __u8 * opt = (__u8 *)(ra_msg + 1); | |
1155 | ||
27a884dc | 1156 | optlen = (skb->tail - skb->transport_header) - sizeof(struct ra_msg); |
1da177e4 | 1157 | |
0660e03f | 1158 | if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) { |
1da177e4 LT |
1159 | ND_PRINTK2(KERN_WARNING |
1160 | "ICMPv6 RA: source address is not link-local.\n"); | |
1161 | return; | |
1162 | } | |
1163 | if (optlen < 0) { | |
1ab1457c | 1164 | ND_PRINTK2(KERN_WARNING |
1da177e4 LT |
1165 | "ICMPv6 RA: packet too short\n"); |
1166 | return; | |
1167 | } | |
1168 | ||
de357cc0 | 1169 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 TF |
1170 | if (skb->ndisc_nodetype == NDISC_NODETYPE_HOST) { |
1171 | ND_PRINTK2(KERN_WARNING | |
1172 | "ICMPv6 RA: from host or unauthorized router\n"); | |
1173 | return; | |
1174 | } | |
de357cc0 | 1175 | #endif |
fadf6bf0 | 1176 | |
1da177e4 LT |
1177 | /* |
1178 | * set the RA_RECV flag in the interface | |
1179 | */ | |
1180 | ||
cfdf7647 | 1181 | in6_dev = __in6_dev_get(skb->dev); |
1da177e4 LT |
1182 | if (in6_dev == NULL) { |
1183 | ND_PRINTK0(KERN_ERR | |
1184 | "ICMPv6 RA: can't find inet6 device for %s.\n", | |
1185 | skb->dev->name); | |
1186 | return; | |
1187 | } | |
1da177e4 LT |
1188 | |
1189 | if (!ndisc_parse_options(opt, optlen, &ndopts)) { | |
1da177e4 LT |
1190 | ND_PRINTK2(KERN_WARNING |
1191 | "ICMP6 RA: invalid ND options\n"); | |
1192 | return; | |
1193 | } | |
1194 | ||
65e9b62d | 1195 | if (!accept_ra(in6_dev)) |
31ce8c71 DW |
1196 | goto skip_linkparms; |
1197 | ||
de357cc0 | 1198 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 TF |
1199 | /* skip link-specific parameters from interior routers */ |
1200 | if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT) | |
1201 | goto skip_linkparms; | |
de357cc0 | 1202 | #endif |
fadf6bf0 | 1203 | |
1da177e4 LT |
1204 | if (in6_dev->if_flags & IF_RS_SENT) { |
1205 | /* | |
1206 | * flag that an RA was received after an RS was sent | |
1207 | * out on this interface. | |
1208 | */ | |
1209 | in6_dev->if_flags |= IF_RA_RCVD; | |
1210 | } | |
1211 | ||
1212 | /* | |
1213 | * Remember the managed/otherconf flags from most recently | |
1214 | * received RA message (RFC 2462) -- yoshfuji | |
1215 | */ | |
1216 | in6_dev->if_flags = (in6_dev->if_flags & ~(IF_RA_MANAGED | | |
1217 | IF_RA_OTHERCONF)) | | |
1218 | (ra_msg->icmph.icmp6_addrconf_managed ? | |
1219 | IF_RA_MANAGED : 0) | | |
1220 | (ra_msg->icmph.icmp6_addrconf_other ? | |
1221 | IF_RA_OTHERCONF : 0); | |
1222 | ||
65f5c7c1 YH |
1223 | if (!in6_dev->cnf.accept_ra_defrtr) |
1224 | goto skip_defrtr; | |
1225 | ||
9f56220f AH |
1226 | if (ipv6_chk_addr(dev_net(in6_dev->dev), &ipv6_hdr(skb)->saddr, NULL, 0)) |
1227 | goto skip_defrtr; | |
1228 | ||
1da177e4 LT |
1229 | lifetime = ntohs(ra_msg->icmph.icmp6_rt_lifetime); |
1230 | ||
ebacaaa0 YH |
1231 | #ifdef CONFIG_IPV6_ROUTER_PREF |
1232 | pref = ra_msg->icmph.icmp6_router_pref; | |
1233 | /* 10b is handled as if it were 00b (medium) */ | |
930d6ff2 | 1234 | if (pref == ICMPV6_ROUTER_PREF_INVALID || |
6d5b78cd | 1235 | !in6_dev->cnf.accept_ra_rtr_pref) |
ebacaaa0 YH |
1236 | pref = ICMPV6_ROUTER_PREF_MEDIUM; |
1237 | #endif | |
1238 | ||
0660e03f | 1239 | rt = rt6_get_dflt_router(&ipv6_hdr(skb)->saddr, skb->dev); |
1da177e4 LT |
1240 | |
1241 | if (rt) | |
69cce1d1 | 1242 | neigh = dst_get_neighbour(&rt->dst); |
1da177e4 LT |
1243 | |
1244 | if (rt && lifetime == 0) { | |
1245 | neigh_clone(neigh); | |
e0a1ad73 | 1246 | ip6_del_rt(rt); |
1da177e4 LT |
1247 | rt = NULL; |
1248 | } | |
1249 | ||
1250 | if (rt == NULL && lifetime) { | |
1251 | ND_PRINTK3(KERN_DEBUG | |
1252 | "ICMPv6 RA: adding default router.\n"); | |
1253 | ||
0660e03f | 1254 | rt = rt6_add_dflt_router(&ipv6_hdr(skb)->saddr, skb->dev, pref); |
1da177e4 LT |
1255 | if (rt == NULL) { |
1256 | ND_PRINTK0(KERN_ERR | |
1257 | "ICMPv6 RA: %s() failed to add default route.\n", | |
0dc47877 | 1258 | __func__); |
1da177e4 LT |
1259 | return; |
1260 | } | |
1261 | ||
69cce1d1 | 1262 | neigh = dst_get_neighbour(&rt->dst); |
1da177e4 LT |
1263 | if (neigh == NULL) { |
1264 | ND_PRINTK0(KERN_ERR | |
1265 | "ICMPv6 RA: %s() got default router without neighbour.\n", | |
0dc47877 | 1266 | __func__); |
d8d1f30b | 1267 | dst_release(&rt->dst); |
1da177e4 LT |
1268 | return; |
1269 | } | |
1270 | neigh->flags |= NTF_ROUTER; | |
ebacaaa0 | 1271 | } else if (rt) { |
22441cfa | 1272 | rt->rt6i_flags = (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); |
1da177e4 LT |
1273 | } |
1274 | ||
1275 | if (rt) | |
1276 | rt->rt6i_expires = jiffies + (HZ * lifetime); | |
1277 | ||
1278 | if (ra_msg->icmph.icmp6_hop_limit) { | |
1279 | in6_dev->cnf.hop_limit = ra_msg->icmph.icmp6_hop_limit; | |
1280 | if (rt) | |
defb3519 DM |
1281 | dst_metric_set(&rt->dst, RTAX_HOPLIMIT, |
1282 | ra_msg->icmph.icmp6_hop_limit); | |
1da177e4 LT |
1283 | } |
1284 | ||
65f5c7c1 YH |
1285 | skip_defrtr: |
1286 | ||
1da177e4 LT |
1287 | /* |
1288 | * Update Reachable Time and Retrans Timer | |
1289 | */ | |
1290 | ||
1291 | if (in6_dev->nd_parms) { | |
1292 | unsigned long rtime = ntohl(ra_msg->retrans_timer); | |
1293 | ||
1294 | if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/HZ) { | |
1295 | rtime = (rtime*HZ)/1000; | |
1296 | if (rtime < HZ/10) | |
1297 | rtime = HZ/10; | |
1298 | in6_dev->nd_parms->retrans_time = rtime; | |
1299 | in6_dev->tstamp = jiffies; | |
1300 | inet6_ifinfo_notify(RTM_NEWLINK, in6_dev); | |
1301 | } | |
1302 | ||
1303 | rtime = ntohl(ra_msg->reachable_time); | |
1304 | if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/(3*HZ)) { | |
1305 | rtime = (rtime*HZ)/1000; | |
1306 | ||
1307 | if (rtime < HZ/10) | |
1308 | rtime = HZ/10; | |
1309 | ||
1310 | if (rtime != in6_dev->nd_parms->base_reachable_time) { | |
1311 | in6_dev->nd_parms->base_reachable_time = rtime; | |
1312 | in6_dev->nd_parms->gc_staletime = 3 * rtime; | |
1313 | in6_dev->nd_parms->reachable_time = neigh_rand_reach_time(rtime); | |
1314 | in6_dev->tstamp = jiffies; | |
1315 | inet6_ifinfo_notify(RTM_NEWLINK, in6_dev); | |
1316 | } | |
1317 | } | |
1318 | } | |
1319 | ||
fadf6bf0 TF |
1320 | skip_linkparms: |
1321 | ||
1da177e4 LT |
1322 | /* |
1323 | * Process options. | |
1324 | */ | |
1325 | ||
1326 | if (!neigh) | |
0660e03f | 1327 | neigh = __neigh_lookup(&nd_tbl, &ipv6_hdr(skb)->saddr, |
1da177e4 LT |
1328 | skb->dev, 1); |
1329 | if (neigh) { | |
1330 | u8 *lladdr = NULL; | |
1331 | if (ndopts.nd_opts_src_lladdr) { | |
1332 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, | |
1333 | skb->dev); | |
1334 | if (!lladdr) { | |
1335 | ND_PRINTK2(KERN_WARNING | |
1336 | "ICMPv6 RA: invalid link-layer address length\n"); | |
1337 | goto out; | |
1338 | } | |
1339 | } | |
1340 | neigh_update(neigh, lladdr, NUD_STALE, | |
1341 | NEIGH_UPDATE_F_WEAK_OVERRIDE| | |
1342 | NEIGH_UPDATE_F_OVERRIDE| | |
1343 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
1344 | NEIGH_UPDATE_F_ISROUTER); | |
1345 | } | |
1346 | ||
65e9b62d | 1347 | if (!accept_ra(in6_dev)) |
31ce8c71 DW |
1348 | goto out; |
1349 | ||
70ceb4f5 | 1350 | #ifdef CONFIG_IPV6_ROUTE_INFO |
9f56220f AH |
1351 | if (ipv6_chk_addr(dev_net(in6_dev->dev), &ipv6_hdr(skb)->saddr, NULL, 0)) |
1352 | goto skip_routeinfo; | |
1353 | ||
09c884d4 | 1354 | if (in6_dev->cnf.accept_ra_rtr_pref && ndopts.nd_opts_ri) { |
70ceb4f5 YH |
1355 | struct nd_opt_hdr *p; |
1356 | for (p = ndopts.nd_opts_ri; | |
1357 | p; | |
1358 | p = ndisc_next_option(p, ndopts.nd_opts_ri_end)) { | |
6294e000 YH |
1359 | struct route_info *ri = (struct route_info *)p; |
1360 | #ifdef CONFIG_IPV6_NDISC_NODETYPE | |
1361 | if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT && | |
1362 | ri->prefix_len == 0) | |
1363 | continue; | |
1364 | #endif | |
1365 | if (ri->prefix_len > in6_dev->cnf.accept_ra_rt_info_max_plen) | |
09c884d4 | 1366 | continue; |
70ceb4f5 | 1367 | rt6_route_rcv(skb->dev, (u8*)p, (p->nd_opt_len) << 3, |
0660e03f | 1368 | &ipv6_hdr(skb)->saddr); |
70ceb4f5 YH |
1369 | } |
1370 | } | |
9f56220f AH |
1371 | |
1372 | skip_routeinfo: | |
70ceb4f5 YH |
1373 | #endif |
1374 | ||
de357cc0 | 1375 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 TF |
1376 | /* skip link-specific ndopts from interior routers */ |
1377 | if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT) | |
1378 | goto out; | |
de357cc0 | 1379 | #endif |
fadf6bf0 | 1380 | |
c4fd30eb | 1381 | if (in6_dev->cnf.accept_ra_pinfo && ndopts.nd_opts_pi) { |
1da177e4 LT |
1382 | struct nd_opt_hdr *p; |
1383 | for (p = ndopts.nd_opts_pi; | |
1384 | p; | |
1385 | p = ndisc_next_option(p, ndopts.nd_opts_pi_end)) { | |
1386 | addrconf_prefix_rcv(skb->dev, (u8*)p, (p->nd_opt_len) << 3); | |
1387 | } | |
1388 | } | |
1389 | ||
1390 | if (ndopts.nd_opts_mtu) { | |
e69a4adc | 1391 | __be32 n; |
1da177e4 LT |
1392 | u32 mtu; |
1393 | ||
e69a4adc AV |
1394 | memcpy(&n, ((u8*)(ndopts.nd_opts_mtu+1))+2, sizeof(mtu)); |
1395 | mtu = ntohl(n); | |
1da177e4 LT |
1396 | |
1397 | if (mtu < IPV6_MIN_MTU || mtu > skb->dev->mtu) { | |
1398 | ND_PRINTK2(KERN_WARNING | |
1399 | "ICMPv6 RA: invalid mtu: %d\n", | |
1400 | mtu); | |
1401 | } else if (in6_dev->cnf.mtu6 != mtu) { | |
1402 | in6_dev->cnf.mtu6 = mtu; | |
1403 | ||
1404 | if (rt) | |
defb3519 | 1405 | dst_metric_set(&rt->dst, RTAX_MTU, mtu); |
1da177e4 LT |
1406 | |
1407 | rt6_mtu_change(skb->dev, mtu); | |
1408 | } | |
1409 | } | |
1ab1457c | 1410 | |
31910575 | 1411 | if (ndopts.nd_useropts) { |
61cf46ad YH |
1412 | struct nd_opt_hdr *p; |
1413 | for (p = ndopts.nd_useropts; | |
1414 | p; | |
1415 | p = ndisc_next_useropt(p, ndopts.nd_useropts_end)) { | |
1416 | ndisc_ra_useropt(skb, p); | |
31910575 PY |
1417 | } |
1418 | } | |
1419 | ||
1da177e4 LT |
1420 | if (ndopts.nd_opts_tgt_lladdr || ndopts.nd_opts_rh) { |
1421 | ND_PRINTK2(KERN_WARNING | |
1422 | "ICMPv6 RA: invalid RA options"); | |
1423 | } | |
1424 | out: | |
1425 | if (rt) | |
d8d1f30b | 1426 | dst_release(&rt->dst); |
1da177e4 LT |
1427 | else if (neigh) |
1428 | neigh_release(neigh); | |
1da177e4 LT |
1429 | } |
1430 | ||
1431 | static void ndisc_redirect_rcv(struct sk_buff *skb) | |
1432 | { | |
1433 | struct inet6_dev *in6_dev; | |
1434 | struct icmp6hdr *icmph; | |
b71d1d42 ED |
1435 | const struct in6_addr *dest; |
1436 | const struct in6_addr *target; /* new first hop to destination */ | |
1da177e4 LT |
1437 | struct neighbour *neigh; |
1438 | int on_link = 0; | |
1439 | struct ndisc_options ndopts; | |
1440 | int optlen; | |
1441 | u8 *lladdr = NULL; | |
1442 | ||
de357cc0 | 1443 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 TF |
1444 | switch (skb->ndisc_nodetype) { |
1445 | case NDISC_NODETYPE_HOST: | |
1446 | case NDISC_NODETYPE_NODEFAULT: | |
1447 | ND_PRINTK2(KERN_WARNING | |
1448 | "ICMPv6 Redirect: from host or unauthorized router\n"); | |
1449 | return; | |
1450 | } | |
de357cc0 | 1451 | #endif |
fadf6bf0 | 1452 | |
0660e03f | 1453 | if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) { |
1da177e4 LT |
1454 | ND_PRINTK2(KERN_WARNING |
1455 | "ICMPv6 Redirect: source address is not link-local.\n"); | |
1456 | return; | |
1457 | } | |
1458 | ||
27a884dc | 1459 | optlen = skb->tail - skb->transport_header; |
1da177e4 LT |
1460 | optlen -= sizeof(struct icmp6hdr) + 2 * sizeof(struct in6_addr); |
1461 | ||
1462 | if (optlen < 0) { | |
1463 | ND_PRINTK2(KERN_WARNING | |
1464 | "ICMPv6 Redirect: packet too short\n"); | |
1465 | return; | |
1466 | } | |
1467 | ||
cc70ab26 | 1468 | icmph = icmp6_hdr(skb); |
b71d1d42 | 1469 | target = (const struct in6_addr *) (icmph + 1); |
1da177e4 LT |
1470 | dest = target + 1; |
1471 | ||
1472 | if (ipv6_addr_is_multicast(dest)) { | |
1473 | ND_PRINTK2(KERN_WARNING | |
1474 | "ICMPv6 Redirect: destination address is multicast.\n"); | |
1475 | return; | |
1476 | } | |
1477 | ||
1478 | if (ipv6_addr_equal(dest, target)) { | |
1479 | on_link = 1; | |
bf0b48df BH |
1480 | } else if (ipv6_addr_type(target) != |
1481 | (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) { | |
1ab1457c | 1482 | ND_PRINTK2(KERN_WARNING |
bf0b48df | 1483 | "ICMPv6 Redirect: target address is not link-local unicast.\n"); |
1da177e4 LT |
1484 | return; |
1485 | } | |
1486 | ||
cfdf7647 | 1487 | in6_dev = __in6_dev_get(skb->dev); |
1da177e4 LT |
1488 | if (!in6_dev) |
1489 | return; | |
cfdf7647 | 1490 | if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects) |
1da177e4 | 1491 | return; |
1da177e4 | 1492 | |
1ab1457c | 1493 | /* RFC2461 8.1: |
1da177e4 LT |
1494 | * The IP source address of the Redirect MUST be the same as the current |
1495 | * first-hop router for the specified ICMP Destination Address. | |
1496 | */ | |
1ab1457c | 1497 | |
1da177e4 LT |
1498 | if (!ndisc_parse_options((u8*)(dest + 1), optlen, &ndopts)) { |
1499 | ND_PRINTK2(KERN_WARNING | |
1500 | "ICMPv6 Redirect: invalid ND options\n"); | |
1da177e4 LT |
1501 | return; |
1502 | } | |
1503 | if (ndopts.nd_opts_tgt_lladdr) { | |
1504 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, | |
1505 | skb->dev); | |
1506 | if (!lladdr) { | |
1507 | ND_PRINTK2(KERN_WARNING | |
1508 | "ICMPv6 Redirect: invalid link-layer address length\n"); | |
1da177e4 LT |
1509 | return; |
1510 | } | |
1511 | } | |
1512 | ||
1513 | neigh = __neigh_lookup(&nd_tbl, target, skb->dev, 1); | |
1514 | if (neigh) { | |
0660e03f ACM |
1515 | rt6_redirect(dest, &ipv6_hdr(skb)->daddr, |
1516 | &ipv6_hdr(skb)->saddr, neigh, lladdr, | |
1da177e4 LT |
1517 | on_link); |
1518 | neigh_release(neigh); | |
1519 | } | |
1da177e4 LT |
1520 | } |
1521 | ||
1522 | void ndisc_send_redirect(struct sk_buff *skb, struct neighbour *neigh, | |
9acd9f3a | 1523 | const struct in6_addr *target) |
1da177e4 | 1524 | { |
1762f7e8 | 1525 | struct net_device *dev = skb->dev; |
c346dca1 | 1526 | struct net *net = dev_net(dev); |
1762f7e8 | 1527 | struct sock *sk = net->ipv6.ndisc_sk; |
1da177e4 LT |
1528 | int len = sizeof(struct icmp6hdr) + 2 * sizeof(struct in6_addr); |
1529 | struct sk_buff *buff; | |
1530 | struct icmp6hdr *icmph; | |
1531 | struct in6_addr saddr_buf; | |
1532 | struct in6_addr *addrp; | |
1da177e4 LT |
1533 | struct rt6_info *rt; |
1534 | struct dst_entry *dst; | |
1535 | struct inet6_dev *idev; | |
4c9483b2 | 1536 | struct flowi6 fl6; |
1da177e4 | 1537 | u8 *opt; |
a7ae1992 | 1538 | int hlen, tlen; |
1da177e4 LT |
1539 | int rd_len; |
1540 | int err; | |
1da177e4 LT |
1541 | u8 ha_buf[MAX_ADDR_LEN], *ha = NULL; |
1542 | ||
95c385b4 | 1543 | if (ipv6_get_lladdr(dev, &saddr_buf, IFA_F_TENTATIVE)) { |
1da177e4 LT |
1544 | ND_PRINTK2(KERN_WARNING |
1545 | "ICMPv6 Redirect: no link-local address on %s\n", | |
1546 | dev->name); | |
1ab1457c YH |
1547 | return; |
1548 | } | |
1da177e4 | 1549 | |
0660e03f | 1550 | if (!ipv6_addr_equal(&ipv6_hdr(skb)->daddr, target) && |
bf0b48df | 1551 | ipv6_addr_type(target) != (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) { |
29556526 | 1552 | ND_PRINTK2(KERN_WARNING |
bf0b48df | 1553 | "ICMPv6 Redirect: target address is not link-local unicast.\n"); |
29556526 LY |
1554 | return; |
1555 | } | |
1556 | ||
4c9483b2 | 1557 | icmpv6_flow_init(sk, &fl6, NDISC_REDIRECT, |
95e41e93 | 1558 | &saddr_buf, &ipv6_hdr(skb)->saddr, dev->ifindex); |
1da177e4 | 1559 | |
4c9483b2 | 1560 | dst = ip6_route_output(net, NULL, &fl6); |
1da177e4 LT |
1561 | if (dst == NULL) |
1562 | return; | |
1563 | ||
4c9483b2 | 1564 | dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), NULL, 0); |
452edd59 | 1565 | if (IS_ERR(dst)) |
1da177e4 | 1566 | return; |
1da177e4 LT |
1567 | |
1568 | rt = (struct rt6_info *) dst; | |
1569 | ||
1570 | if (rt->rt6i_flags & RTF_GATEWAY) { | |
1571 | ND_PRINTK2(KERN_WARNING | |
1572 | "ICMPv6 Redirect: destination is not a neighbour.\n"); | |
d73f0801 | 1573 | goto release; |
1da177e4 | 1574 | } |
92d86829 DM |
1575 | if (!rt->rt6i_peer) |
1576 | rt6_bind_peer(rt, 1); | |
1577 | if (inet_peer_xrlim_allow(rt->rt6i_peer, 1*HZ)) | |
d73f0801 | 1578 | goto release; |
1da177e4 LT |
1579 | |
1580 | if (dev->addr_len) { | |
1581 | read_lock_bh(&neigh->lock); | |
1582 | if (neigh->nud_state & NUD_VALID) { | |
1583 | memcpy(ha_buf, neigh->ha, dev->addr_len); | |
1584 | read_unlock_bh(&neigh->lock); | |
1585 | ha = ha_buf; | |
1586 | len += ndisc_opt_addr_space(dev); | |
1587 | } else | |
1588 | read_unlock_bh(&neigh->lock); | |
1589 | } | |
1590 | ||
1591 | rd_len = min_t(unsigned int, | |
1592 | IPV6_MIN_MTU-sizeof(struct ipv6hdr)-len, skb->len + 8); | |
1593 | rd_len &= ~0x7; | |
1594 | len += rd_len; | |
1595 | ||
a7ae1992 HX |
1596 | hlen = LL_RESERVED_SPACE(dev); |
1597 | tlen = dev->needed_tailroom; | |
d54a81d3 DM |
1598 | buff = sock_alloc_send_skb(sk, |
1599 | (MAX_HEADER + sizeof(struct ipv6hdr) + | |
a7ae1992 | 1600 | len + hlen + tlen), |
1da177e4 LT |
1601 | 1, &err); |
1602 | if (buff == NULL) { | |
1603 | ND_PRINTK0(KERN_ERR | |
dae9de8e BH |
1604 | "ICMPv6 Redirect: %s() failed to allocate an skb, err=%d.\n", |
1605 | __func__, err); | |
d73f0801 | 1606 | goto release; |
1da177e4 LT |
1607 | } |
1608 | ||
a7ae1992 | 1609 | skb_reserve(buff, hlen); |
0660e03f | 1610 | ip6_nd_hdr(sk, buff, dev, &saddr_buf, &ipv6_hdr(skb)->saddr, |
1da177e4 LT |
1611 | IPPROTO_ICMPV6, len); |
1612 | ||
27a884dc | 1613 | skb_set_transport_header(buff, skb_tail_pointer(buff) - buff->data); |
d10ba34b ACM |
1614 | skb_put(buff, len); |
1615 | icmph = icmp6_hdr(buff); | |
1da177e4 LT |
1616 | |
1617 | memset(icmph, 0, sizeof(struct icmp6hdr)); | |
1618 | icmph->icmp6_type = NDISC_REDIRECT; | |
1619 | ||
1620 | /* | |
1621 | * copy target and destination addresses | |
1622 | */ | |
1623 | ||
1624 | addrp = (struct in6_addr *)(icmph + 1); | |
1625 | ipv6_addr_copy(addrp, target); | |
1626 | addrp++; | |
0660e03f | 1627 | ipv6_addr_copy(addrp, &ipv6_hdr(skb)->daddr); |
1da177e4 LT |
1628 | |
1629 | opt = (u8*) (addrp + 1); | |
1630 | ||
1631 | /* | |
1632 | * include target_address option | |
1633 | */ | |
1634 | ||
1635 | if (ha) | |
1636 | opt = ndisc_fill_addr_option(opt, ND_OPT_TARGET_LL_ADDR, ha, | |
1637 | dev->addr_len, dev->type); | |
1638 | ||
1639 | /* | |
1640 | * build redirect option and copy skb over to the new packet. | |
1641 | */ | |
1642 | ||
1ab1457c | 1643 | memset(opt, 0, 8); |
1da177e4 LT |
1644 | *(opt++) = ND_OPT_REDIRECT_HDR; |
1645 | *(opt++) = (rd_len >> 3); | |
1646 | opt += 6; | |
1647 | ||
0660e03f | 1648 | memcpy(opt, ipv6_hdr(skb), rd_len - 8); |
1da177e4 | 1649 | |
0660e03f | 1650 | icmph->icmp6_cksum = csum_ipv6_magic(&saddr_buf, &ipv6_hdr(skb)->saddr, |
1da177e4 | 1651 | len, IPPROTO_ICMPV6, |
07f0757a | 1652 | csum_partial(icmph, len, 0)); |
1da177e4 | 1653 | |
adf30907 | 1654 | skb_dst_set(buff, dst); |
cfdf7647 ED |
1655 | rcu_read_lock(); |
1656 | idev = __in6_dev_get(dst->dev); | |
edf391ff | 1657 | IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len); |
b2e0b385 | 1658 | err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, buff, NULL, dst->dev, |
6e23ae2a | 1659 | dst_output); |
1da177e4 | 1660 | if (!err) { |
5c5d244b | 1661 | ICMP6MSGOUT_INC_STATS(net, idev, NDISC_REDIRECT); |
a862f6a6 | 1662 | ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); |
1da177e4 LT |
1663 | } |
1664 | ||
cfdf7647 | 1665 | rcu_read_unlock(); |
d73f0801 IJ |
1666 | return; |
1667 | ||
1668 | release: | |
1669 | dst_release(dst); | |
1da177e4 LT |
1670 | } |
1671 | ||
1672 | static void pndisc_redo(struct sk_buff *skb) | |
1673 | { | |
140e26fc | 1674 | ndisc_recv_ns(skb); |
1da177e4 LT |
1675 | kfree_skb(skb); |
1676 | } | |
1677 | ||
1678 | int ndisc_rcv(struct sk_buff *skb) | |
1679 | { | |
1680 | struct nd_msg *msg; | |
1681 | ||
1682 | if (!pskb_may_pull(skb, skb->len)) | |
1683 | return 0; | |
1684 | ||
9c70220b | 1685 | msg = (struct nd_msg *)skb_transport_header(skb); |
1da177e4 | 1686 | |
9c70220b | 1687 | __skb_push(skb, skb->data - skb_transport_header(skb)); |
1da177e4 | 1688 | |
0660e03f | 1689 | if (ipv6_hdr(skb)->hop_limit != 255) { |
1da177e4 LT |
1690 | ND_PRINTK2(KERN_WARNING |
1691 | "ICMPv6 NDISC: invalid hop-limit: %d\n", | |
0660e03f | 1692 | ipv6_hdr(skb)->hop_limit); |
1da177e4 LT |
1693 | return 0; |
1694 | } | |
1695 | ||
1696 | if (msg->icmph.icmp6_code != 0) { | |
1ab1457c | 1697 | ND_PRINTK2(KERN_WARNING |
1da177e4 LT |
1698 | "ICMPv6 NDISC: invalid ICMPv6 code: %d\n", |
1699 | msg->icmph.icmp6_code); | |
1700 | return 0; | |
1701 | } | |
1702 | ||
a61bbcf2 PM |
1703 | memset(NEIGH_CB(skb), 0, sizeof(struct neighbour_cb)); |
1704 | ||
1da177e4 LT |
1705 | switch (msg->icmph.icmp6_type) { |
1706 | case NDISC_NEIGHBOUR_SOLICITATION: | |
1707 | ndisc_recv_ns(skb); | |
1708 | break; | |
1709 | ||
1710 | case NDISC_NEIGHBOUR_ADVERTISEMENT: | |
1711 | ndisc_recv_na(skb); | |
1712 | break; | |
1713 | ||
1714 | case NDISC_ROUTER_SOLICITATION: | |
1715 | ndisc_recv_rs(skb); | |
1716 | break; | |
1717 | ||
1718 | case NDISC_ROUTER_ADVERTISEMENT: | |
1719 | ndisc_router_discovery(skb); | |
1720 | break; | |
1721 | ||
1722 | case NDISC_REDIRECT: | |
1723 | ndisc_redirect_rcv(skb); | |
1724 | break; | |
3ff50b79 | 1725 | } |
1da177e4 LT |
1726 | |
1727 | return 0; | |
1728 | } | |
1729 | ||
1730 | static int ndisc_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1731 | { | |
1732 | struct net_device *dev = ptr; | |
c346dca1 | 1733 | struct net *net = dev_net(dev); |
1da177e4 LT |
1734 | |
1735 | switch (event) { | |
1736 | case NETDEV_CHANGEADDR: | |
1737 | neigh_changeaddr(&nd_tbl, dev); | |
5b7c931d | 1738 | fib6_run_gc(~0UL, net); |
1da177e4 LT |
1739 | break; |
1740 | case NETDEV_DOWN: | |
1741 | neigh_ifdown(&nd_tbl, dev); | |
5b7c931d | 1742 | fib6_run_gc(~0UL, net); |
1da177e4 | 1743 | break; |
f47b9464 BH |
1744 | case NETDEV_NOTIFY_PEERS: |
1745 | ndisc_send_unsol_na(dev); | |
1746 | break; | |
1da177e4 LT |
1747 | default: |
1748 | break; | |
1749 | } | |
1750 | ||
1751 | return NOTIFY_DONE; | |
1752 | } | |
1753 | ||
1754 | static struct notifier_block ndisc_netdev_notifier = { | |
1755 | .notifier_call = ndisc_netdev_event, | |
1756 | }; | |
1757 | ||
1758 | #ifdef CONFIG_SYSCTL | |
1759 | static void ndisc_warn_deprecated_sysctl(struct ctl_table *ctl, | |
1760 | const char *func, const char *dev_name) | |
1761 | { | |
1762 | static char warncomm[TASK_COMM_LEN]; | |
1763 | static int warned; | |
1764 | if (strcmp(warncomm, current->comm) && warned < 5) { | |
1765 | strcpy(warncomm, current->comm); | |
1766 | printk(KERN_WARNING | |
1767 | "process `%s' is using deprecated sysctl (%s) " | |
1768 | "net.ipv6.neigh.%s.%s; " | |
1769 | "Use net.ipv6.neigh.%s.%s_ms " | |
1770 | "instead.\n", | |
1771 | warncomm, func, | |
1772 | dev_name, ctl->procname, | |
1773 | dev_name, ctl->procname); | |
1774 | warned++; | |
1775 | } | |
1776 | } | |
1777 | ||
8d65af78 | 1778 | int ndisc_ifinfo_sysctl_change(struct ctl_table *ctl, int write, void __user *buffer, size_t *lenp, loff_t *ppos) |
1da177e4 LT |
1779 | { |
1780 | struct net_device *dev = ctl->extra1; | |
1781 | struct inet6_dev *idev; | |
1782 | int ret; | |
1783 | ||
d12af679 EB |
1784 | if ((strcmp(ctl->procname, "retrans_time") == 0) || |
1785 | (strcmp(ctl->procname, "base_reachable_time") == 0)) | |
1da177e4 LT |
1786 | ndisc_warn_deprecated_sysctl(ctl, "syscall", dev ? dev->name : "default"); |
1787 | ||
d12af679 | 1788 | if (strcmp(ctl->procname, "retrans_time") == 0) |
8d65af78 | 1789 | ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
d12af679 EB |
1790 | |
1791 | else if (strcmp(ctl->procname, "base_reachable_time") == 0) | |
1da177e4 | 1792 | ret = proc_dointvec_jiffies(ctl, write, |
8d65af78 | 1793 | buffer, lenp, ppos); |
d12af679 EB |
1794 | |
1795 | else if ((strcmp(ctl->procname, "retrans_time_ms") == 0) || | |
ad02ac14 | 1796 | (strcmp(ctl->procname, "base_reachable_time_ms") == 0)) |
1da177e4 | 1797 | ret = proc_dointvec_ms_jiffies(ctl, write, |
8d65af78 | 1798 | buffer, lenp, ppos); |
d12af679 | 1799 | else |
1da177e4 | 1800 | ret = -1; |
1da177e4 LT |
1801 | |
1802 | if (write && ret == 0 && dev && (idev = in6_dev_get(dev)) != NULL) { | |
d12af679 | 1803 | if (ctl->data == &idev->nd_parms->base_reachable_time) |
1da177e4 LT |
1804 | idev->nd_parms->reachable_time = neigh_rand_reach_time(idev->nd_parms->base_reachable_time); |
1805 | idev->tstamp = jiffies; | |
1806 | inet6_ifinfo_notify(RTM_NEWLINK, idev); | |
1807 | in6_dev_put(idev); | |
1808 | } | |
1809 | return ret; | |
1810 | } | |
1811 | ||
1da177e4 LT |
1812 | |
1813 | #endif | |
1814 | ||
2c8c1e72 | 1815 | static int __net_init ndisc_net_init(struct net *net) |
1da177e4 LT |
1816 | { |
1817 | struct ipv6_pinfo *np; | |
1818 | struct sock *sk; | |
1ab1457c | 1819 | int err; |
1da177e4 | 1820 | |
1ed8516f DL |
1821 | err = inet_ctl_sock_create(&sk, PF_INET6, |
1822 | SOCK_RAW, IPPROTO_ICMPV6, net); | |
1da177e4 LT |
1823 | if (err < 0) { |
1824 | ND_PRINTK0(KERN_ERR | |
1ab1457c | 1825 | "ICMPv6 NDISC: Failed to initialize the control socket (err %d).\n", |
1da177e4 | 1826 | err); |
1da177e4 LT |
1827 | return err; |
1828 | } | |
1829 | ||
1ed8516f | 1830 | net->ipv6.ndisc_sk = sk; |
1762f7e8 | 1831 | |
1da177e4 | 1832 | np = inet6_sk(sk); |
1da177e4 LT |
1833 | np->hop_limit = 255; |
1834 | /* Do not loopback ndisc messages */ | |
1835 | np->mc_loop = 0; | |
1da177e4 | 1836 | |
1762f7e8 DL |
1837 | return 0; |
1838 | } | |
1839 | ||
2c8c1e72 | 1840 | static void __net_exit ndisc_net_exit(struct net *net) |
1762f7e8 | 1841 | { |
1ed8516f | 1842 | inet_ctl_sock_destroy(net->ipv6.ndisc_sk); |
1762f7e8 DL |
1843 | } |
1844 | ||
1845 | static struct pernet_operations ndisc_net_ops = { | |
1846 | .init = ndisc_net_init, | |
1847 | .exit = ndisc_net_exit, | |
1848 | }; | |
1849 | ||
1850 | int __init ndisc_init(void) | |
1851 | { | |
1852 | int err; | |
1853 | ||
1854 | err = register_pernet_subsys(&ndisc_net_ops); | |
1855 | if (err) | |
1856 | return err; | |
1ab1457c YH |
1857 | /* |
1858 | * Initialize the neighbour table | |
1859 | */ | |
1da177e4 LT |
1860 | neigh_table_init(&nd_tbl); |
1861 | ||
1862 | #ifdef CONFIG_SYSCTL | |
54716e3b | 1863 | err = neigh_sysctl_register(NULL, &nd_tbl.parms, "ipv6", |
f8572d8f | 1864 | &ndisc_ifinfo_sysctl_change); |
1762f7e8 DL |
1865 | if (err) |
1866 | goto out_unregister_pernet; | |
1da177e4 | 1867 | #endif |
1762f7e8 DL |
1868 | err = register_netdevice_notifier(&ndisc_netdev_notifier); |
1869 | if (err) | |
1870 | goto out_unregister_sysctl; | |
1871 | out: | |
1872 | return err; | |
1da177e4 | 1873 | |
1762f7e8 DL |
1874 | out_unregister_sysctl: |
1875 | #ifdef CONFIG_SYSCTL | |
1876 | neigh_sysctl_unregister(&nd_tbl.parms); | |
1877 | out_unregister_pernet: | |
1878 | #endif | |
1879 | unregister_pernet_subsys(&ndisc_net_ops); | |
1880 | goto out; | |
1da177e4 LT |
1881 | } |
1882 | ||
1883 | void ndisc_cleanup(void) | |
1884 | { | |
36f73d0c | 1885 | unregister_netdevice_notifier(&ndisc_netdev_notifier); |
1da177e4 LT |
1886 | #ifdef CONFIG_SYSCTL |
1887 | neigh_sysctl_unregister(&nd_tbl.parms); | |
1888 | #endif | |
1889 | neigh_table_clear(&nd_tbl); | |
1762f7e8 | 1890 | unregister_pernet_subsys(&ndisc_net_ops); |
1da177e4 | 1891 | } |