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 | * | |
e35f30c1 | 18 | * Alexey I. Froloff : RFC6106 (DNSSL) support |
31910575 PY |
19 | * Pierre Ynard : export userland ND options |
20 | * through netlink (RDNSS support) | |
1da177e4 LT |
21 | * Lars Fenneberg : fixed MTU setting on receipt |
22 | * of an RA. | |
1da177e4 LT |
23 | * Janos Farkas : kmalloc failure checks |
24 | * Alexey Kuznetsov : state machine reworked | |
25 | * and moved to net/core. | |
26 | * Pekka Savola : RFC2461 validation | |
27 | * YOSHIFUJI Hideaki @USAGI : Verify ND options properly | |
28 | */ | |
29 | ||
675418d5 | 30 | #define pr_fmt(fmt) "ICMPv6: " fmt |
1da177e4 LT |
31 | |
32 | #include <linux/module.h> | |
1da177e4 LT |
33 | #include <linux/errno.h> |
34 | #include <linux/types.h> | |
35 | #include <linux/socket.h> | |
36 | #include <linux/sockios.h> | |
37 | #include <linux/sched.h> | |
38 | #include <linux/net.h> | |
39 | #include <linux/in6.h> | |
40 | #include <linux/route.h> | |
41 | #include <linux/init.h> | |
42 | #include <linux/rcupdate.h> | |
5a0e3ad6 | 43 | #include <linux/slab.h> |
1da177e4 LT |
44 | #ifdef CONFIG_SYSCTL |
45 | #include <linux/sysctl.h> | |
46 | #endif | |
47 | ||
1823730f | 48 | #include <linux/if_addr.h> |
1da177e4 LT |
49 | #include <linux/if_arp.h> |
50 | #include <linux/ipv6.h> | |
51 | #include <linux/icmpv6.h> | |
52 | #include <linux/jhash.h> | |
53 | ||
54 | #include <net/sock.h> | |
55 | #include <net/snmp.h> | |
56 | ||
57 | #include <net/ipv6.h> | |
58 | #include <net/protocol.h> | |
59 | #include <net/ndisc.h> | |
60 | #include <net/ip6_route.h> | |
61 | #include <net/addrconf.h> | |
62 | #include <net/icmp.h> | |
63 | ||
31910575 PY |
64 | #include <net/netlink.h> |
65 | #include <linux/rtnetlink.h> | |
66 | ||
1da177e4 LT |
67 | #include <net/flow.h> |
68 | #include <net/ip6_checksum.h> | |
1ed8516f | 69 | #include <net/inet_common.h> |
1da177e4 LT |
70 | #include <linux/proc_fs.h> |
71 | ||
72 | #include <linux/netfilter.h> | |
73 | #include <linux/netfilter_ipv6.h> | |
74 | ||
675418d5 JP |
75 | /* Set to 3 to get tracing... */ |
76 | #define ND_DEBUG 1 | |
77 | ||
78 | #define ND_PRINTK(val, level, fmt, ...) \ | |
79 | do { \ | |
80 | if (val <= ND_DEBUG) \ | |
81 | net_##level##_ratelimited(fmt, ##__VA_ARGS__); \ | |
82 | } while (0) | |
83 | ||
d6bf7817 ED |
84 | static u32 ndisc_hash(const void *pkey, |
85 | const struct net_device *dev, | |
2c2aba6c | 86 | __u32 *hash_rnd); |
1da177e4 LT |
87 | static int ndisc_constructor(struct neighbour *neigh); |
88 | static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb); | |
89 | static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb); | |
90 | static int pndisc_constructor(struct pneigh_entry *n); | |
91 | static void pndisc_destructor(struct pneigh_entry *n); | |
92 | static void pndisc_redo(struct sk_buff *skb); | |
93 | ||
89d69d2b | 94 | static const struct neigh_ops ndisc_generic_ops = { |
1da177e4 LT |
95 | .family = AF_INET6, |
96 | .solicit = ndisc_solicit, | |
97 | .error_report = ndisc_error_report, | |
98 | .output = neigh_resolve_output, | |
99 | .connected_output = neigh_connected_output, | |
1da177e4 LT |
100 | }; |
101 | ||
89d69d2b | 102 | static const struct neigh_ops ndisc_hh_ops = { |
1da177e4 LT |
103 | .family = AF_INET6, |
104 | .solicit = ndisc_solicit, | |
105 | .error_report = ndisc_error_report, | |
106 | .output = neigh_resolve_output, | |
107 | .connected_output = neigh_resolve_output, | |
1da177e4 LT |
108 | }; |
109 | ||
110 | ||
89d69d2b | 111 | static const struct neigh_ops ndisc_direct_ops = { |
1da177e4 | 112 | .family = AF_INET6, |
8f40b161 DM |
113 | .output = neigh_direct_output, |
114 | .connected_output = neigh_direct_output, | |
1da177e4 LT |
115 | }; |
116 | ||
117 | struct neigh_table nd_tbl = { | |
118 | .family = AF_INET6, | |
1da177e4 LT |
119 | .key_len = sizeof(struct in6_addr), |
120 | .hash = ndisc_hash, | |
121 | .constructor = ndisc_constructor, | |
122 | .pconstructor = pndisc_constructor, | |
123 | .pdestructor = pndisc_destructor, | |
124 | .proxy_redo = pndisc_redo, | |
125 | .id = "ndisc_cache", | |
126 | .parms = { | |
b672083e SW |
127 | .tbl = &nd_tbl, |
128 | .base_reachable_time = ND_REACHABLE_TIME, | |
129 | .retrans_time = ND_RETRANS_TIMER, | |
130 | .gc_staletime = 60 * HZ, | |
131 | .reachable_time = ND_REACHABLE_TIME, | |
132 | .delay_probe_time = 5 * HZ, | |
8b5c171b | 133 | .queue_len_bytes = 64*1024, |
b672083e SW |
134 | .ucast_probes = 3, |
135 | .mcast_probes = 3, | |
136 | .anycast_delay = 1 * HZ, | |
137 | .proxy_delay = (8 * HZ) / 10, | |
138 | .proxy_qlen = 64, | |
1da177e4 LT |
139 | }, |
140 | .gc_interval = 30 * HZ, | |
141 | .gc_thresh1 = 128, | |
142 | .gc_thresh2 = 512, | |
143 | .gc_thresh3 = 1024, | |
144 | }; | |
145 | ||
1da177e4 LT |
146 | static inline int ndisc_opt_addr_space(struct net_device *dev) |
147 | { | |
148 | return NDISC_OPT_SPACE(dev->addr_len + ndisc_addr_option_pad(dev->type)); | |
149 | } | |
150 | ||
151 | static u8 *ndisc_fill_addr_option(u8 *opt, int type, void *data, int data_len, | |
152 | unsigned short addr_type) | |
153 | { | |
1da177e4 | 154 | int pad = ndisc_addr_option_pad(addr_type); |
7bdc1b4a | 155 | int space = NDISC_OPT_SPACE(data_len + pad); |
1da177e4 LT |
156 | |
157 | opt[0] = type; | |
158 | opt[1] = space>>3; | |
159 | ||
160 | memset(opt + 2, 0, pad); | |
161 | opt += pad; | |
162 | space -= pad; | |
163 | ||
164 | memcpy(opt+2, data, data_len); | |
165 | data_len += 2; | |
166 | opt += data_len; | |
167 | if ((space -= data_len) > 0) | |
168 | memset(opt, 0, space); | |
169 | return opt + space; | |
170 | } | |
171 | ||
172 | static struct nd_opt_hdr *ndisc_next_option(struct nd_opt_hdr *cur, | |
173 | struct nd_opt_hdr *end) | |
174 | { | |
175 | int type; | |
176 | if (!cur || !end || cur >= end) | |
177 | return NULL; | |
178 | type = cur->nd_opt_type; | |
179 | do { | |
180 | cur = ((void *)cur) + (cur->nd_opt_len << 3); | |
181 | } while(cur < end && cur->nd_opt_type != type); | |
a02cec21 | 182 | return cur <= end && cur->nd_opt_type == type ? cur : NULL; |
1da177e4 LT |
183 | } |
184 | ||
31910575 PY |
185 | static inline int ndisc_is_useropt(struct nd_opt_hdr *opt) |
186 | { | |
e35f30c1 AF |
187 | return opt->nd_opt_type == ND_OPT_RDNSS || |
188 | opt->nd_opt_type == ND_OPT_DNSSL; | |
31910575 PY |
189 | } |
190 | ||
191 | static struct nd_opt_hdr *ndisc_next_useropt(struct nd_opt_hdr *cur, | |
192 | struct nd_opt_hdr *end) | |
193 | { | |
194 | if (!cur || !end || cur >= end) | |
195 | return NULL; | |
196 | do { | |
197 | cur = ((void *)cur) + (cur->nd_opt_len << 3); | |
198 | } while(cur < end && !ndisc_is_useropt(cur)); | |
a02cec21 | 199 | return cur <= end && ndisc_is_useropt(cur) ? cur : NULL; |
31910575 PY |
200 | } |
201 | ||
30f2a5f3 DM |
202 | struct ndisc_options *ndisc_parse_options(u8 *opt, int opt_len, |
203 | struct ndisc_options *ndopts) | |
1da177e4 LT |
204 | { |
205 | struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)opt; | |
206 | ||
207 | if (!nd_opt || opt_len < 0 || !ndopts) | |
208 | return NULL; | |
209 | memset(ndopts, 0, sizeof(*ndopts)); | |
210 | while (opt_len) { | |
211 | int l; | |
212 | if (opt_len < sizeof(struct nd_opt_hdr)) | |
213 | return NULL; | |
214 | l = nd_opt->nd_opt_len << 3; | |
215 | if (opt_len < l || l == 0) | |
216 | return NULL; | |
217 | switch (nd_opt->nd_opt_type) { | |
218 | case ND_OPT_SOURCE_LL_ADDR: | |
219 | case ND_OPT_TARGET_LL_ADDR: | |
220 | case ND_OPT_MTU: | |
221 | case ND_OPT_REDIRECT_HDR: | |
222 | if (ndopts->nd_opt_array[nd_opt->nd_opt_type]) { | |
675418d5 JP |
223 | ND_PRINTK(2, warn, |
224 | "%s: duplicated ND6 option found: type=%d\n", | |
225 | __func__, nd_opt->nd_opt_type); | |
1da177e4 LT |
226 | } else { |
227 | ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt; | |
228 | } | |
229 | break; | |
230 | case ND_OPT_PREFIX_INFO: | |
231 | ndopts->nd_opts_pi_end = nd_opt; | |
cfcabdcc | 232 | if (!ndopts->nd_opt_array[nd_opt->nd_opt_type]) |
1da177e4 LT |
233 | ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt; |
234 | break; | |
70ceb4f5 YH |
235 | #ifdef CONFIG_IPV6_ROUTE_INFO |
236 | case ND_OPT_ROUTE_INFO: | |
237 | ndopts->nd_opts_ri_end = nd_opt; | |
238 | if (!ndopts->nd_opts_ri) | |
239 | ndopts->nd_opts_ri = nd_opt; | |
240 | break; | |
241 | #endif | |
1da177e4 | 242 | default: |
31910575 PY |
243 | if (ndisc_is_useropt(nd_opt)) { |
244 | ndopts->nd_useropts_end = nd_opt; | |
245 | if (!ndopts->nd_useropts) | |
246 | ndopts->nd_useropts = nd_opt; | |
247 | } else { | |
248 | /* | |
249 | * Unknown options must be silently ignored, | |
250 | * to accommodate future extension to the | |
251 | * protocol. | |
252 | */ | |
675418d5 JP |
253 | ND_PRINTK(2, notice, |
254 | "%s: ignored unsupported option; type=%d, len=%d\n", | |
255 | __func__, | |
256 | nd_opt->nd_opt_type, | |
257 | nd_opt->nd_opt_len); | |
31910575 | 258 | } |
1da177e4 LT |
259 | } |
260 | opt_len -= l; | |
261 | nd_opt = ((void *)nd_opt) + l; | |
262 | } | |
263 | return ndopts; | |
264 | } | |
265 | ||
b71d1d42 | 266 | int ndisc_mc_map(const struct in6_addr *addr, char *buf, struct net_device *dev, int dir) |
1da177e4 LT |
267 | { |
268 | switch (dev->type) { | |
269 | case ARPHRD_ETHER: | |
270 | case ARPHRD_IEEE802: /* Not sure. Check it later. --ANK */ | |
271 | case ARPHRD_FDDI: | |
272 | ipv6_eth_mc_map(addr, buf); | |
273 | return 0; | |
1da177e4 LT |
274 | case ARPHRD_ARCNET: |
275 | ipv6_arcnet_mc_map(addr, buf); | |
276 | return 0; | |
277 | case ARPHRD_INFINIBAND: | |
a9e527e3 | 278 | ipv6_ib_mc_map(addr, dev->broadcast, buf); |
1da177e4 | 279 | return 0; |
93ca3bb5 TT |
280 | case ARPHRD_IPGRE: |
281 | return ipv6_ipgre_mc_map(addr, dev->broadcast, buf); | |
1da177e4 LT |
282 | default: |
283 | if (dir) { | |
284 | memcpy(buf, dev->broadcast, dev->addr_len); | |
285 | return 0; | |
286 | } | |
287 | } | |
288 | return -EINVAL; | |
289 | } | |
290 | ||
7159039a YH |
291 | EXPORT_SYMBOL(ndisc_mc_map); |
292 | ||
d6bf7817 ED |
293 | static u32 ndisc_hash(const void *pkey, |
294 | const struct net_device *dev, | |
2c2aba6c | 295 | __u32 *hash_rnd) |
1da177e4 | 296 | { |
2c2aba6c | 297 | return ndisc_hashfn(pkey, dev, hash_rnd); |
1da177e4 LT |
298 | } |
299 | ||
300 | static int ndisc_constructor(struct neighbour *neigh) | |
301 | { | |
302 | struct in6_addr *addr = (struct in6_addr*)&neigh->primary_key; | |
303 | struct net_device *dev = neigh->dev; | |
304 | struct inet6_dev *in6_dev; | |
305 | struct neigh_parms *parms; | |
a50feda5 | 306 | bool is_multicast = ipv6_addr_is_multicast(addr); |
1da177e4 | 307 | |
1da177e4 LT |
308 | in6_dev = in6_dev_get(dev); |
309 | if (in6_dev == NULL) { | |
1da177e4 LT |
310 | return -EINVAL; |
311 | } | |
312 | ||
313 | parms = in6_dev->nd_parms; | |
314 | __neigh_parms_put(neigh->parms); | |
315 | neigh->parms = neigh_parms_clone(parms); | |
1da177e4 LT |
316 | |
317 | neigh->type = is_multicast ? RTN_MULTICAST : RTN_UNICAST; | |
3b04ddde | 318 | if (!dev->header_ops) { |
1da177e4 LT |
319 | neigh->nud_state = NUD_NOARP; |
320 | neigh->ops = &ndisc_direct_ops; | |
8f40b161 | 321 | neigh->output = neigh_direct_output; |
1da177e4 LT |
322 | } else { |
323 | if (is_multicast) { | |
324 | neigh->nud_state = NUD_NOARP; | |
325 | ndisc_mc_map(addr, neigh->ha, dev, 1); | |
326 | } else if (dev->flags&(IFF_NOARP|IFF_LOOPBACK)) { | |
327 | neigh->nud_state = NUD_NOARP; | |
328 | memcpy(neigh->ha, dev->dev_addr, dev->addr_len); | |
329 | if (dev->flags&IFF_LOOPBACK) | |
330 | neigh->type = RTN_LOCAL; | |
331 | } else if (dev->flags&IFF_POINTOPOINT) { | |
332 | neigh->nud_state = NUD_NOARP; | |
333 | memcpy(neigh->ha, dev->broadcast, dev->addr_len); | |
334 | } | |
3b04ddde | 335 | if (dev->header_ops->cache) |
1da177e4 LT |
336 | neigh->ops = &ndisc_hh_ops; |
337 | else | |
338 | neigh->ops = &ndisc_generic_ops; | |
339 | if (neigh->nud_state&NUD_VALID) | |
340 | neigh->output = neigh->ops->connected_output; | |
341 | else | |
342 | neigh->output = neigh->ops->output; | |
343 | } | |
344 | in6_dev_put(in6_dev); | |
345 | return 0; | |
346 | } | |
347 | ||
348 | static int pndisc_constructor(struct pneigh_entry *n) | |
349 | { | |
350 | struct in6_addr *addr = (struct in6_addr*)&n->key; | |
351 | struct in6_addr maddr; | |
352 | struct net_device *dev = n->dev; | |
353 | ||
354 | if (dev == NULL || __in6_dev_get(dev) == NULL) | |
355 | return -EINVAL; | |
356 | addrconf_addr_solict_mult(addr, &maddr); | |
357 | ipv6_dev_mc_inc(dev, &maddr); | |
358 | return 0; | |
359 | } | |
360 | ||
361 | static void pndisc_destructor(struct pneigh_entry *n) | |
362 | { | |
363 | struct in6_addr *addr = (struct in6_addr*)&n->key; | |
364 | struct in6_addr maddr; | |
365 | struct net_device *dev = n->dev; | |
366 | ||
367 | if (dev == NULL || __in6_dev_get(dev) == NULL) | |
368 | return; | |
369 | addrconf_addr_solict_mult(addr, &maddr); | |
370 | ipv6_dev_mc_dec(dev, &maddr); | |
371 | } | |
372 | ||
fd0ea7db YH |
373 | static struct sk_buff *ndisc_build_skb(struct net_device *dev, |
374 | const struct in6_addr *daddr, | |
375 | const struct in6_addr *saddr, | |
376 | struct icmp6hdr *icmp6h, | |
377 | const struct in6_addr *target, | |
378 | int llinfo) | |
1da177e4 | 379 | { |
c346dca1 | 380 | struct net *net = dev_net(dev); |
1762f7e8 | 381 | struct sock *sk = net->ipv6.ndisc_sk; |
1ab1457c | 382 | struct sk_buff *skb; |
e1ec7842 | 383 | struct icmp6hdr *hdr; |
a7ae1992 HX |
384 | int hlen = LL_RESERVED_SPACE(dev); |
385 | int tlen = dev->needed_tailroom; | |
e1ec7842 | 386 | int len; |
1da177e4 | 387 | int err; |
305d552a | 388 | u8 *opt; |
1da177e4 | 389 | |
e1ec7842 YH |
390 | if (!dev->addr_len) |
391 | llinfo = 0; | |
392 | ||
393 | len = sizeof(struct icmp6hdr) + (target ? sizeof(*target) : 0); | |
394 | if (llinfo) | |
395 | len += ndisc_opt_addr_space(dev); | |
1da177e4 | 396 | |
d54a81d3 DM |
397 | skb = sock_alloc_send_skb(sk, |
398 | (MAX_HEADER + sizeof(struct ipv6hdr) + | |
a7ae1992 | 399 | len + hlen + tlen), |
1da177e4 | 400 | 1, &err); |
e1ec7842 | 401 | if (!skb) { |
675418d5 JP |
402 | ND_PRINTK(0, err, "ND: %s failed to allocate an skb, err=%d\n", |
403 | __func__, err); | |
305d552a | 404 | return NULL; |
1da177e4 LT |
405 | } |
406 | ||
a7ae1992 | 407 | skb_reserve(skb, hlen); |
e1ec7842 | 408 | ip6_nd_hdr(sk, skb, dev, saddr, daddr, IPPROTO_ICMPV6, len); |
1da177e4 | 409 | |
27a884dc | 410 | skb->transport_header = skb->tail; |
d10ba34b | 411 | skb_put(skb, len); |
1da177e4 | 412 | |
e1ec7842 YH |
413 | hdr = (struct icmp6hdr *)skb_transport_header(skb); |
414 | memcpy(hdr, icmp6h, sizeof(*hdr)); | |
1da177e4 | 415 | |
e1ec7842 YH |
416 | opt = skb_transport_header(skb) + sizeof(struct icmp6hdr); |
417 | if (target) { | |
4e3fd7a0 | 418 | *(struct in6_addr *)opt = *target; |
e1ec7842 YH |
419 | opt += sizeof(*target); |
420 | } | |
1da177e4 | 421 | |
e1ec7842 YH |
422 | if (llinfo) |
423 | ndisc_fill_addr_option(opt, llinfo, dev->dev_addr, | |
1da177e4 LT |
424 | dev->addr_len, dev->type); |
425 | ||
e1ec7842 YH |
426 | hdr->icmp6_cksum = csum_ipv6_magic(saddr, daddr, len, |
427 | IPPROTO_ICMPV6, | |
07f0757a | 428 | csum_partial(hdr, |
e1ec7842 | 429 | len, 0)); |
1da177e4 | 430 | |
305d552a BH |
431 | return skb; |
432 | } | |
433 | ||
fd0ea7db YH |
434 | static void ndisc_send_skb(struct sk_buff *skb, struct net_device *dev, |
435 | struct neighbour *neigh, | |
436 | const struct in6_addr *daddr, | |
437 | const struct in6_addr *saddr, | |
438 | struct icmp6hdr *icmp6h) | |
305d552a | 439 | { |
4c9483b2 | 440 | struct flowi6 fl6; |
305d552a BH |
441 | struct dst_entry *dst; |
442 | struct net *net = dev_net(dev); | |
443 | struct sock *sk = net->ipv6.ndisc_sk; | |
444 | struct inet6_dev *idev; | |
445 | int err; | |
446 | u8 type; | |
447 | ||
448 | type = icmp6h->icmp6_type; | |
449 | ||
4c9483b2 | 450 | icmpv6_flow_init(sk, &fl6, type, saddr, daddr, dev->ifindex); |
87a11578 | 451 | dst = icmp6_dst_alloc(dev, neigh, &fl6); |
452edd59 | 452 | if (IS_ERR(dst)) { |
305d552a BH |
453 | kfree_skb(skb); |
454 | return; | |
455 | } | |
456 | ||
adf30907 | 457 | skb_dst_set(skb, dst); |
e1ec7842 | 458 | |
cfdf7647 ED |
459 | rcu_read_lock(); |
460 | idev = __in6_dev_get(dst->dev); | |
edf391ff | 461 | IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len); |
e1ec7842 | 462 | |
b2e0b385 | 463 | err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, dst->dev, |
6e23ae2a | 464 | dst_output); |
1da177e4 | 465 | if (!err) { |
5c5d244b | 466 | ICMP6MSGOUT_INC_STATS(net, idev, type); |
a862f6a6 | 467 | ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); |
1da177e4 LT |
468 | } |
469 | ||
cfdf7647 | 470 | rcu_read_unlock(); |
1ab1457c | 471 | } |
1da177e4 | 472 | |
305d552a BH |
473 | /* |
474 | * Send a Neighbour Discover packet | |
475 | */ | |
476 | static void __ndisc_send(struct net_device *dev, | |
477 | struct neighbour *neigh, | |
478 | const struct in6_addr *daddr, | |
479 | const struct in6_addr *saddr, | |
480 | struct icmp6hdr *icmp6h, const struct in6_addr *target, | |
481 | int llinfo) | |
482 | { | |
483 | struct sk_buff *skb; | |
484 | ||
485 | skb = ndisc_build_skb(dev, daddr, saddr, icmp6h, target, llinfo); | |
486 | if (!skb) | |
487 | return; | |
488 | ||
489 | ndisc_send_skb(skb, dev, neigh, daddr, saddr, icmp6h); | |
490 | } | |
491 | ||
e1ec7842 | 492 | static void ndisc_send_na(struct net_device *dev, struct neighbour *neigh, |
9acd9f3a YH |
493 | const struct in6_addr *daddr, |
494 | const struct in6_addr *solicited_addr, | |
495 | int router, int solicited, int override, int inc_opt) | |
e1ec7842 YH |
496 | { |
497 | struct in6_addr tmpaddr; | |
498 | struct inet6_ifaddr *ifp; | |
9acd9f3a | 499 | const struct in6_addr *src_addr; |
e1ec7842 YH |
500 | struct icmp6hdr icmp6h = { |
501 | .icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT, | |
502 | }; | |
503 | ||
504 | /* for anycast or proxy, solicited_addr != src_addr */ | |
c346dca1 | 505 | ifp = ipv6_get_ifaddr(dev_net(dev), solicited_addr, dev, 1); |
e1ec7842 YH |
506 | if (ifp) { |
507 | src_addr = solicited_addr; | |
508 | if (ifp->flags & IFA_F_OPTIMISTIC) | |
509 | override = 0; | |
9f888160 | 510 | inc_opt |= ifp->idev->cnf.force_tllao; |
e1ec7842 YH |
511 | in6_ifa_put(ifp); |
512 | } else { | |
191cd582 | 513 | if (ipv6_dev_get_saddr(dev_net(dev), dev, daddr, |
c346dca1 | 514 | inet6_sk(dev_net(dev)->ipv6.ndisc_sk)->srcprefs, |
7cbca67c | 515 | &tmpaddr)) |
e1ec7842 YH |
516 | return; |
517 | src_addr = &tmpaddr; | |
518 | } | |
519 | ||
520 | icmp6h.icmp6_router = router; | |
521 | icmp6h.icmp6_solicited = solicited; | |
522 | icmp6h.icmp6_override = override; | |
523 | ||
524 | __ndisc_send(dev, neigh, daddr, src_addr, | |
525 | &icmp6h, solicited_addr, | |
14878f75 | 526 | inc_opt ? ND_OPT_TARGET_LL_ADDR : 0); |
e1ec7842 YH |
527 | } |
528 | ||
f47b9464 BH |
529 | static void ndisc_send_unsol_na(struct net_device *dev) |
530 | { | |
531 | struct inet6_dev *idev; | |
532 | struct inet6_ifaddr *ifa; | |
f47b9464 BH |
533 | |
534 | idev = in6_dev_get(dev); | |
535 | if (!idev) | |
536 | return; | |
537 | ||
538 | read_lock_bh(&idev->lock); | |
539 | list_for_each_entry(ifa, &idev->addr_list, if_list) { | |
9fafd65a | 540 | ndisc_send_na(dev, NULL, &in6addr_linklocal_allnodes, &ifa->addr, |
f47b9464 BH |
541 | /*router=*/ !!idev->cnf.forwarding, |
542 | /*solicited=*/ false, /*override=*/ true, | |
543 | /*inc_opt=*/ true); | |
544 | } | |
545 | read_unlock_bh(&idev->lock); | |
546 | ||
547 | in6_dev_put(idev); | |
548 | } | |
549 | ||
1da177e4 | 550 | void ndisc_send_ns(struct net_device *dev, struct neighbour *neigh, |
9acd9f3a YH |
551 | const struct in6_addr *solicit, |
552 | const struct in6_addr *daddr, const struct in6_addr *saddr) | |
1da177e4 | 553 | { |
1da177e4 | 554 | struct in6_addr addr_buf; |
e1ec7842 YH |
555 | struct icmp6hdr icmp6h = { |
556 | .icmp6_type = NDISC_NEIGHBOUR_SOLICITATION, | |
557 | }; | |
1da177e4 LT |
558 | |
559 | if (saddr == NULL) { | |
95c385b4 NH |
560 | if (ipv6_get_lladdr(dev, &addr_buf, |
561 | (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC))) | |
1da177e4 LT |
562 | return; |
563 | saddr = &addr_buf; | |
564 | } | |
565 | ||
e1ec7842 YH |
566 | __ndisc_send(dev, neigh, daddr, saddr, |
567 | &icmp6h, solicit, | |
14878f75 | 568 | !ipv6_addr_any(saddr) ? ND_OPT_SOURCE_LL_ADDR : 0); |
1da177e4 LT |
569 | } |
570 | ||
9acd9f3a YH |
571 | void ndisc_send_rs(struct net_device *dev, const struct in6_addr *saddr, |
572 | const struct in6_addr *daddr) | |
1da177e4 | 573 | { |
e1ec7842 YH |
574 | struct icmp6hdr icmp6h = { |
575 | .icmp6_type = NDISC_ROUTER_SOLICITATION, | |
576 | }; | |
95c385b4 | 577 | int send_sllao = dev->addr_len; |
95c385b4 NH |
578 | |
579 | #ifdef CONFIG_IPV6_OPTIMISTIC_DAD | |
580 | /* | |
581 | * According to section 2.2 of RFC 4429, we must not | |
582 | * send router solicitations with a sllao from | |
583 | * optimistic addresses, but we may send the solicitation | |
584 | * if we don't include the sllao. So here we check | |
585 | * if our address is optimistic, and if so, we | |
bea85195 | 586 | * suppress the inclusion of the sllao. |
95c385b4 NH |
587 | */ |
588 | if (send_sllao) { | |
c346dca1 | 589 | struct inet6_ifaddr *ifp = ipv6_get_ifaddr(dev_net(dev), saddr, |
1cab3da6 | 590 | dev, 1); |
95c385b4 NH |
591 | if (ifp) { |
592 | if (ifp->flags & IFA_F_OPTIMISTIC) { | |
ca043569 | 593 | send_sllao = 0; |
95c385b4 | 594 | } |
ca043569 | 595 | in6_ifa_put(ifp); |
95c385b4 NH |
596 | } else { |
597 | send_sllao = 0; | |
598 | } | |
599 | } | |
600 | #endif | |
e1ec7842 YH |
601 | __ndisc_send(dev, NULL, daddr, saddr, |
602 | &icmp6h, NULL, | |
14878f75 | 603 | send_sllao ? ND_OPT_SOURCE_LL_ADDR : 0); |
1da177e4 | 604 | } |
1ab1457c | 605 | |
1da177e4 LT |
606 | |
607 | static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb) | |
608 | { | |
609 | /* | |
610 | * "The sender MUST return an ICMP | |
611 | * destination unreachable" | |
612 | */ | |
613 | dst_link_failure(skb); | |
614 | kfree_skb(skb); | |
615 | } | |
616 | ||
617 | /* Called with locked neigh: either read or both */ | |
618 | ||
619 | static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb) | |
620 | { | |
621 | struct in6_addr *saddr = NULL; | |
622 | struct in6_addr mcaddr; | |
623 | struct net_device *dev = neigh->dev; | |
624 | struct in6_addr *target = (struct in6_addr *)&neigh->primary_key; | |
625 | int probes = atomic_read(&neigh->probes); | |
626 | ||
c346dca1 | 627 | if (skb && ipv6_chk_addr(dev_net(dev), &ipv6_hdr(skb)->saddr, dev, 1)) |
0660e03f | 628 | saddr = &ipv6_hdr(skb)->saddr; |
1da177e4 LT |
629 | |
630 | if ((probes -= neigh->parms->ucast_probes) < 0) { | |
631 | if (!(neigh->nud_state & NUD_VALID)) { | |
675418d5 JP |
632 | ND_PRINTK(1, dbg, |
633 | "%s: trying to ucast probe in NUD_INVALID: %pI6\n", | |
634 | __func__, target); | |
1da177e4 LT |
635 | } |
636 | ndisc_send_ns(dev, neigh, target, target, saddr); | |
637 | } else if ((probes -= neigh->parms->app_probes) < 0) { | |
638 | #ifdef CONFIG_ARPD | |
639 | neigh_app_ns(neigh); | |
640 | #endif | |
641 | } else { | |
642 | addrconf_addr_solict_mult(target, &mcaddr); | |
643 | ndisc_send_ns(dev, NULL, target, &mcaddr, saddr); | |
644 | } | |
645 | } | |
646 | ||
0736ffc0 YH |
647 | static int pndisc_is_router(const void *pkey, |
648 | struct net_device *dev) | |
fa86d322 PE |
649 | { |
650 | struct pneigh_entry *n; | |
0736ffc0 | 651 | int ret = -1; |
fa86d322 PE |
652 | |
653 | read_lock_bh(&nd_tbl.lock); | |
0736ffc0 YH |
654 | n = __pneigh_lookup(&nd_tbl, dev_net(dev), pkey, dev); |
655 | if (n) | |
656 | ret = !!(n->flags & NTF_ROUTER); | |
fa86d322 PE |
657 | read_unlock_bh(&nd_tbl.lock); |
658 | ||
0736ffc0 | 659 | return ret; |
fa86d322 PE |
660 | } |
661 | ||
1da177e4 LT |
662 | static void ndisc_recv_ns(struct sk_buff *skb) |
663 | { | |
9c70220b | 664 | struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb); |
b71d1d42 ED |
665 | const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; |
666 | const struct in6_addr *daddr = &ipv6_hdr(skb)->daddr; | |
1da177e4 | 667 | u8 *lladdr = NULL; |
27a884dc ACM |
668 | u32 ndoptlen = skb->tail - (skb->transport_header + |
669 | offsetof(struct nd_msg, opt)); | |
1da177e4 LT |
670 | struct ndisc_options ndopts; |
671 | struct net_device *dev = skb->dev; | |
672 | struct inet6_ifaddr *ifp; | |
673 | struct inet6_dev *idev = NULL; | |
674 | struct neighbour *neigh; | |
675 | int dad = ipv6_addr_any(saddr); | |
a50feda5 | 676 | bool inc; |
0736ffc0 | 677 | int is_router = -1; |
1da177e4 LT |
678 | |
679 | if (ipv6_addr_is_multicast(&msg->target)) { | |
675418d5 | 680 | ND_PRINTK(2, warn, "NS: multicast target address\n"); |
1da177e4 LT |
681 | return; |
682 | } | |
683 | ||
684 | /* | |
685 | * RFC2461 7.1.1: | |
686 | * DAD has to be destined for solicited node multicast address. | |
687 | */ | |
688 | if (dad && | |
689 | !(daddr->s6_addr32[0] == htonl(0xff020000) && | |
690 | daddr->s6_addr32[1] == htonl(0x00000000) && | |
691 | daddr->s6_addr32[2] == htonl(0x00000001) && | |
692 | daddr->s6_addr [12] == 0xff )) { | |
675418d5 | 693 | ND_PRINTK(2, warn, "NS: bad DAD packet (wrong destination)\n"); |
1da177e4 LT |
694 | return; |
695 | } | |
696 | ||
697 | if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) { | |
675418d5 | 698 | ND_PRINTK(2, warn, "NS: invalid ND options\n"); |
1da177e4 LT |
699 | return; |
700 | } | |
701 | ||
702 | if (ndopts.nd_opts_src_lladdr) { | |
703 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, dev); | |
704 | if (!lladdr) { | |
675418d5 JP |
705 | ND_PRINTK(2, warn, |
706 | "NS: invalid link-layer address length\n"); | |
1da177e4 LT |
707 | return; |
708 | } | |
709 | ||
710 | /* RFC2461 7.1.1: | |
1ab1457c YH |
711 | * If the IP source address is the unspecified address, |
712 | * there MUST NOT be source link-layer address option | |
1da177e4 LT |
713 | * in the message. |
714 | */ | |
715 | if (dad) { | |
675418d5 JP |
716 | ND_PRINTK(2, warn, |
717 | "NS: bad DAD packet (link-layer address option)\n"); | |
1da177e4 LT |
718 | return; |
719 | } | |
720 | } | |
721 | ||
722 | inc = ipv6_addr_is_multicast(daddr); | |
723 | ||
c346dca1 | 724 | ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1); |
a18bc695 | 725 | if (ifp) { |
95c385b4 NH |
726 | |
727 | if (ifp->flags & (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC)) { | |
728 | if (dad) { | |
95c385b4 NH |
729 | /* |
730 | * We are colliding with another node | |
731 | * who is doing DAD | |
732 | * so fail our DAD process | |
733 | */ | |
734 | addrconf_dad_failure(ifp); | |
9e3be4b3 | 735 | return; |
95c385b4 NH |
736 | } else { |
737 | /* | |
738 | * This is not a dad solicitation. | |
739 | * If we are an optimistic node, | |
740 | * we should respond. | |
741 | * Otherwise, we should ignore it. | |
742 | */ | |
743 | if (!(ifp->flags & IFA_F_OPTIMISTIC)) | |
1da177e4 | 744 | goto out; |
1da177e4 | 745 | } |
1da177e4 LT |
746 | } |
747 | ||
748 | idev = ifp->idev; | |
749 | } else { | |
53b7997f YH |
750 | struct net *net = dev_net(dev); |
751 | ||
1da177e4 LT |
752 | idev = in6_dev_get(dev); |
753 | if (!idev) { | |
754 | /* XXX: count this drop? */ | |
755 | return; | |
756 | } | |
757 | ||
53b7997f | 758 | if (ipv6_chk_acast_addr(net, dev, &msg->target) || |
1ab1457c | 759 | (idev->cnf.forwarding && |
53b7997f | 760 | (net->ipv6.devconf_all->proxy_ndp || idev->cnf.proxy_ndp) && |
0736ffc0 | 761 | (is_router = pndisc_is_router(&msg->target, dev)) >= 0)) { |
a61bbcf2 | 762 | if (!(NEIGH_CB(skb)->flags & LOCALLY_ENQUEUED) && |
1da177e4 LT |
763 | skb->pkt_type != PACKET_HOST && |
764 | inc != 0 && | |
765 | idev->nd_parms->proxy_delay != 0) { | |
766 | /* | |
767 | * for anycast or proxy, | |
1ab1457c YH |
768 | * sender should delay its response |
769 | * by a random time between 0 and | |
1da177e4 LT |
770 | * MAX_ANYCAST_DELAY_TIME seconds. |
771 | * (RFC2461) -- yoshfuji | |
772 | */ | |
773 | struct sk_buff *n = skb_clone(skb, GFP_ATOMIC); | |
774 | if (n) | |
775 | pneigh_enqueue(&nd_tbl, idev->nd_parms, n); | |
776 | goto out; | |
777 | } | |
778 | } else | |
779 | goto out; | |
780 | } | |
781 | ||
0736ffc0 YH |
782 | if (is_router < 0) |
783 | is_router = !!idev->cnf.forwarding; | |
62dd9318 | 784 | |
1da177e4 | 785 | if (dad) { |
f3ee4010 | 786 | ndisc_send_na(dev, NULL, &in6addr_linklocal_allnodes, &msg->target, |
62dd9318 | 787 | is_router, 0, (ifp != NULL), 1); |
1da177e4 LT |
788 | goto out; |
789 | } | |
790 | ||
791 | if (inc) | |
792 | NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_mcast); | |
793 | else | |
794 | NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_ucast); | |
795 | ||
1ab1457c | 796 | /* |
1da177e4 LT |
797 | * update / create cache entry |
798 | * for the source address | |
799 | */ | |
800 | neigh = __neigh_lookup(&nd_tbl, saddr, dev, | |
801 | !inc || lladdr || !dev->addr_len); | |
802 | if (neigh) | |
1ab1457c | 803 | neigh_update(neigh, lladdr, NUD_STALE, |
1da177e4 LT |
804 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
805 | NEIGH_UPDATE_F_OVERRIDE); | |
3b04ddde | 806 | if (neigh || !dev->header_ops) { |
1da177e4 | 807 | ndisc_send_na(dev, neigh, saddr, &msg->target, |
62dd9318 | 808 | is_router, |
1da177e4 LT |
809 | 1, (ifp != NULL && inc), inc); |
810 | if (neigh) | |
811 | neigh_release(neigh); | |
812 | } | |
813 | ||
814 | out: | |
815 | if (ifp) | |
816 | in6_ifa_put(ifp); | |
817 | else | |
818 | in6_dev_put(idev); | |
1da177e4 LT |
819 | } |
820 | ||
821 | static void ndisc_recv_na(struct sk_buff *skb) | |
822 | { | |
9c70220b | 823 | struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb); |
b71d1d42 ED |
824 | const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; |
825 | const struct in6_addr *daddr = &ipv6_hdr(skb)->daddr; | |
1da177e4 | 826 | u8 *lladdr = NULL; |
27a884dc ACM |
827 | u32 ndoptlen = skb->tail - (skb->transport_header + |
828 | offsetof(struct nd_msg, opt)); | |
1da177e4 LT |
829 | struct ndisc_options ndopts; |
830 | struct net_device *dev = skb->dev; | |
831 | struct inet6_ifaddr *ifp; | |
832 | struct neighbour *neigh; | |
833 | ||
834 | if (skb->len < sizeof(struct nd_msg)) { | |
675418d5 | 835 | ND_PRINTK(2, warn, "NA: packet too short\n"); |
1da177e4 LT |
836 | return; |
837 | } | |
838 | ||
839 | if (ipv6_addr_is_multicast(&msg->target)) { | |
675418d5 | 840 | ND_PRINTK(2, warn, "NA: target address is multicast\n"); |
1da177e4 LT |
841 | return; |
842 | } | |
843 | ||
844 | if (ipv6_addr_is_multicast(daddr) && | |
845 | msg->icmph.icmp6_solicited) { | |
675418d5 | 846 | ND_PRINTK(2, warn, "NA: solicited NA is multicasted\n"); |
1da177e4 LT |
847 | return; |
848 | } | |
1ab1457c | 849 | |
1da177e4 | 850 | if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) { |
675418d5 | 851 | ND_PRINTK(2, warn, "NS: invalid ND option\n"); |
1da177e4 LT |
852 | return; |
853 | } | |
854 | if (ndopts.nd_opts_tgt_lladdr) { | |
855 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, dev); | |
856 | if (!lladdr) { | |
675418d5 JP |
857 | ND_PRINTK(2, warn, |
858 | "NA: invalid link-layer address length\n"); | |
1da177e4 LT |
859 | return; |
860 | } | |
861 | } | |
c346dca1 | 862 | ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1); |
a18bc695 | 863 | if (ifp) { |
bd015928 DW |
864 | if (skb->pkt_type != PACKET_LOOPBACK |
865 | && (ifp->flags & IFA_F_TENTATIVE)) { | |
866 | addrconf_dad_failure(ifp); | |
867 | return; | |
1da177e4 LT |
868 | } |
869 | /* What should we make now? The advertisement | |
870 | is invalid, but ndisc specs say nothing | |
871 | about it. It could be misconfiguration, or | |
872 | an smart proxy agent tries to help us :-) | |
24fc7b86 JS |
873 | |
874 | We should not print the error if NA has been | |
875 | received from loopback - it is just our own | |
876 | unsolicited advertisement. | |
1da177e4 | 877 | */ |
24fc7b86 | 878 | if (skb->pkt_type != PACKET_LOOPBACK) |
675418d5 JP |
879 | ND_PRINTK(1, warn, |
880 | "NA: someone advertises our address %pI6 on %s!\n", | |
881 | &ifp->addr, ifp->idev->dev->name); | |
1da177e4 LT |
882 | in6_ifa_put(ifp); |
883 | return; | |
884 | } | |
885 | neigh = neigh_lookup(&nd_tbl, &msg->target, dev); | |
886 | ||
887 | if (neigh) { | |
888 | u8 old_flags = neigh->flags; | |
53b7997f | 889 | struct net *net = dev_net(dev); |
1da177e4 LT |
890 | |
891 | if (neigh->nud_state & NUD_FAILED) | |
892 | goto out; | |
893 | ||
5f3e6e9e VN |
894 | /* |
895 | * Don't update the neighbor cache entry on a proxy NA from | |
896 | * ourselves because either the proxied node is off link or it | |
897 | * has already sent a NA to us. | |
898 | */ | |
899 | if (lladdr && !memcmp(lladdr, dev->dev_addr, dev->addr_len) && | |
53b7997f YH |
900 | net->ipv6.devconf_all->forwarding && net->ipv6.devconf_all->proxy_ndp && |
901 | pneigh_lookup(&nd_tbl, net, &msg->target, dev, 0)) { | |
b20b6d97 | 902 | /* XXX: idev->cnf.proxy_ndp */ |
5f3e6e9e | 903 | goto out; |
fbea49e1 | 904 | } |
5f3e6e9e | 905 | |
1da177e4 LT |
906 | neigh_update(neigh, lladdr, |
907 | msg->icmph.icmp6_solicited ? NUD_REACHABLE : NUD_STALE, | |
908 | NEIGH_UPDATE_F_WEAK_OVERRIDE| | |
909 | (msg->icmph.icmp6_override ? NEIGH_UPDATE_F_OVERRIDE : 0)| | |
910 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
911 | (msg->icmph.icmp6_router ? NEIGH_UPDATE_F_ISROUTER : 0)); | |
912 | ||
913 | if ((old_flags & ~neigh->flags) & NTF_ROUTER) { | |
914 | /* | |
915 | * Change: router to host | |
916 | */ | |
917 | struct rt6_info *rt; | |
918 | rt = rt6_get_dflt_router(saddr, dev); | |
919 | if (rt) | |
e0a1ad73 | 920 | ip6_del_rt(rt); |
1da177e4 LT |
921 | } |
922 | ||
923 | out: | |
924 | neigh_release(neigh); | |
925 | } | |
926 | } | |
927 | ||
928 | static void ndisc_recv_rs(struct sk_buff *skb) | |
929 | { | |
9c70220b | 930 | struct rs_msg *rs_msg = (struct rs_msg *)skb_transport_header(skb); |
1da177e4 LT |
931 | unsigned long ndoptlen = skb->len - sizeof(*rs_msg); |
932 | struct neighbour *neigh; | |
933 | struct inet6_dev *idev; | |
b71d1d42 | 934 | const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; |
1da177e4 LT |
935 | struct ndisc_options ndopts; |
936 | u8 *lladdr = NULL; | |
937 | ||
938 | if (skb->len < sizeof(*rs_msg)) | |
939 | return; | |
940 | ||
cfdf7647 | 941 | idev = __in6_dev_get(skb->dev); |
1da177e4 | 942 | if (!idev) { |
675418d5 | 943 | ND_PRINTK(1, err, "RS: can't find in6 device\n"); |
1da177e4 LT |
944 | return; |
945 | } | |
946 | ||
947 | /* Don't accept RS if we're not in router mode */ | |
948 | if (!idev->cnf.forwarding) | |
949 | goto out; | |
950 | ||
951 | /* | |
952 | * Don't update NCE if src = ::; | |
953 | * this implies that the source node has no ip address assigned yet. | |
954 | */ | |
955 | if (ipv6_addr_any(saddr)) | |
956 | goto out; | |
957 | ||
958 | /* Parse ND options */ | |
959 | if (!ndisc_parse_options(rs_msg->opt, ndoptlen, &ndopts)) { | |
675418d5 | 960 | ND_PRINTK(2, notice, "NS: invalid ND option, ignored\n"); |
1da177e4 LT |
961 | goto out; |
962 | } | |
963 | ||
964 | if (ndopts.nd_opts_src_lladdr) { | |
965 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, | |
966 | skb->dev); | |
967 | if (!lladdr) | |
968 | goto out; | |
969 | } | |
970 | ||
971 | neigh = __neigh_lookup(&nd_tbl, saddr, skb->dev, 1); | |
972 | if (neigh) { | |
973 | neigh_update(neigh, lladdr, NUD_STALE, | |
974 | NEIGH_UPDATE_F_WEAK_OVERRIDE| | |
975 | NEIGH_UPDATE_F_OVERRIDE| | |
976 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER); | |
977 | neigh_release(neigh); | |
978 | } | |
979 | out: | |
cfdf7647 | 980 | return; |
1da177e4 LT |
981 | } |
982 | ||
31910575 PY |
983 | static void ndisc_ra_useropt(struct sk_buff *ra, struct nd_opt_hdr *opt) |
984 | { | |
985 | struct icmp6hdr *icmp6h = (struct icmp6hdr *)skb_transport_header(ra); | |
986 | struct sk_buff *skb; | |
987 | struct nlmsghdr *nlh; | |
988 | struct nduseroptmsg *ndmsg; | |
c346dca1 | 989 | struct net *net = dev_net(ra->dev); |
31910575 PY |
990 | int err; |
991 | int base_size = NLMSG_ALIGN(sizeof(struct nduseroptmsg) | |
992 | + (opt->nd_opt_len << 3)); | |
993 | size_t msg_size = base_size + nla_total_size(sizeof(struct in6_addr)); | |
994 | ||
995 | skb = nlmsg_new(msg_size, GFP_ATOMIC); | |
996 | if (skb == NULL) { | |
997 | err = -ENOBUFS; | |
998 | goto errout; | |
999 | } | |
1000 | ||
1001 | nlh = nlmsg_put(skb, 0, 0, RTM_NEWNDUSEROPT, base_size, 0); | |
1002 | if (nlh == NULL) { | |
1003 | goto nla_put_failure; | |
1004 | } | |
1005 | ||
1006 | ndmsg = nlmsg_data(nlh); | |
1007 | ndmsg->nduseropt_family = AF_INET6; | |
dbb2ed24 | 1008 | ndmsg->nduseropt_ifindex = ra->dev->ifindex; |
31910575 PY |
1009 | ndmsg->nduseropt_icmp_type = icmp6h->icmp6_type; |
1010 | ndmsg->nduseropt_icmp_code = icmp6h->icmp6_code; | |
1011 | ndmsg->nduseropt_opts_len = opt->nd_opt_len << 3; | |
1012 | ||
1013 | memcpy(ndmsg + 1, opt, opt->nd_opt_len << 3); | |
1014 | ||
c78679e8 DM |
1015 | if (nla_put(skb, NDUSEROPT_SRCADDR, sizeof(struct in6_addr), |
1016 | &ipv6_hdr(ra)->saddr)) | |
1017 | goto nla_put_failure; | |
31910575 PY |
1018 | nlmsg_end(skb, nlh); |
1019 | ||
1ce85fe4 | 1020 | rtnl_notify(skb, net, 0, RTNLGRP_ND_USEROPT, NULL, GFP_ATOMIC); |
31910575 PY |
1021 | return; |
1022 | ||
1023 | nla_put_failure: | |
1024 | nlmsg_free(skb); | |
1025 | err = -EMSGSIZE; | |
1026 | errout: | |
a18bc695 | 1027 | rtnl_set_sk_err(net, RTNLGRP_ND_USEROPT, err); |
31910575 PY |
1028 | } |
1029 | ||
1da177e4 LT |
1030 | static void ndisc_router_discovery(struct sk_buff *skb) |
1031 | { | |
9c70220b | 1032 | struct ra_msg *ra_msg = (struct ra_msg *)skb_transport_header(skb); |
1da177e4 LT |
1033 | struct neighbour *neigh = NULL; |
1034 | struct inet6_dev *in6_dev; | |
65f5c7c1 | 1035 | struct rt6_info *rt = NULL; |
1da177e4 LT |
1036 | int lifetime; |
1037 | struct ndisc_options ndopts; | |
1038 | int optlen; | |
ebacaaa0 | 1039 | unsigned int pref = 0; |
1da177e4 LT |
1040 | |
1041 | __u8 * opt = (__u8 *)(ra_msg + 1); | |
1042 | ||
27a884dc | 1043 | optlen = (skb->tail - skb->transport_header) - sizeof(struct ra_msg); |
1da177e4 | 1044 | |
0660e03f | 1045 | if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) { |
675418d5 | 1046 | ND_PRINTK(2, warn, "RA: source address is not link-local\n"); |
1da177e4 LT |
1047 | return; |
1048 | } | |
1049 | if (optlen < 0) { | |
675418d5 | 1050 | ND_PRINTK(2, warn, "RA: packet too short\n"); |
1da177e4 LT |
1051 | return; |
1052 | } | |
1053 | ||
de357cc0 | 1054 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 | 1055 | if (skb->ndisc_nodetype == NDISC_NODETYPE_HOST) { |
675418d5 | 1056 | ND_PRINTK(2, warn, "RA: from host or unauthorized router\n"); |
fadf6bf0 TF |
1057 | return; |
1058 | } | |
de357cc0 | 1059 | #endif |
fadf6bf0 | 1060 | |
1da177e4 LT |
1061 | /* |
1062 | * set the RA_RECV flag in the interface | |
1063 | */ | |
1064 | ||
cfdf7647 | 1065 | in6_dev = __in6_dev_get(skb->dev); |
1da177e4 | 1066 | if (in6_dev == NULL) { |
675418d5 JP |
1067 | ND_PRINTK(0, err, "RA: can't find inet6 device for %s\n", |
1068 | skb->dev->name); | |
1da177e4 LT |
1069 | return; |
1070 | } | |
1da177e4 LT |
1071 | |
1072 | if (!ndisc_parse_options(opt, optlen, &ndopts)) { | |
675418d5 | 1073 | ND_PRINTK(2, warn, "RA: invalid ND options\n"); |
1da177e4 LT |
1074 | return; |
1075 | } | |
1076 | ||
aeaf6e9d | 1077 | if (!ipv6_accept_ra(in6_dev)) |
31ce8c71 DW |
1078 | goto skip_linkparms; |
1079 | ||
de357cc0 | 1080 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 TF |
1081 | /* skip link-specific parameters from interior routers */ |
1082 | if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT) | |
1083 | goto skip_linkparms; | |
de357cc0 | 1084 | #endif |
fadf6bf0 | 1085 | |
1da177e4 LT |
1086 | if (in6_dev->if_flags & IF_RS_SENT) { |
1087 | /* | |
1088 | * flag that an RA was received after an RS was sent | |
1089 | * out on this interface. | |
1090 | */ | |
1091 | in6_dev->if_flags |= IF_RA_RCVD; | |
1092 | } | |
1093 | ||
1094 | /* | |
1095 | * Remember the managed/otherconf flags from most recently | |
1096 | * received RA message (RFC 2462) -- yoshfuji | |
1097 | */ | |
1098 | in6_dev->if_flags = (in6_dev->if_flags & ~(IF_RA_MANAGED | | |
1099 | IF_RA_OTHERCONF)) | | |
1100 | (ra_msg->icmph.icmp6_addrconf_managed ? | |
1101 | IF_RA_MANAGED : 0) | | |
1102 | (ra_msg->icmph.icmp6_addrconf_other ? | |
1103 | IF_RA_OTHERCONF : 0); | |
1104 | ||
65f5c7c1 YH |
1105 | if (!in6_dev->cnf.accept_ra_defrtr) |
1106 | goto skip_defrtr; | |
1107 | ||
9f56220f AH |
1108 | if (ipv6_chk_addr(dev_net(in6_dev->dev), &ipv6_hdr(skb)->saddr, NULL, 0)) |
1109 | goto skip_defrtr; | |
1110 | ||
1da177e4 LT |
1111 | lifetime = ntohs(ra_msg->icmph.icmp6_rt_lifetime); |
1112 | ||
ebacaaa0 YH |
1113 | #ifdef CONFIG_IPV6_ROUTER_PREF |
1114 | pref = ra_msg->icmph.icmp6_router_pref; | |
1115 | /* 10b is handled as if it were 00b (medium) */ | |
930d6ff2 | 1116 | if (pref == ICMPV6_ROUTER_PREF_INVALID || |
6d5b78cd | 1117 | !in6_dev->cnf.accept_ra_rtr_pref) |
ebacaaa0 YH |
1118 | pref = ICMPV6_ROUTER_PREF_MEDIUM; |
1119 | #endif | |
1120 | ||
0660e03f | 1121 | rt = rt6_get_dflt_router(&ipv6_hdr(skb)->saddr, skb->dev); |
1da177e4 | 1122 | |
eb857186 DM |
1123 | if (rt) { |
1124 | neigh = dst_neigh_lookup(&rt->dst, &ipv6_hdr(skb)->saddr); | |
1125 | if (!neigh) { | |
675418d5 JP |
1126 | ND_PRINTK(0, err, |
1127 | "RA: %s got default router without neighbour\n", | |
1128 | __func__); | |
94e187c0 | 1129 | ip6_rt_put(rt); |
eb857186 DM |
1130 | return; |
1131 | } | |
1132 | } | |
1da177e4 | 1133 | if (rt && lifetime == 0) { |
e0a1ad73 | 1134 | ip6_del_rt(rt); |
1da177e4 LT |
1135 | rt = NULL; |
1136 | } | |
1137 | ||
1138 | if (rt == NULL && lifetime) { | |
675418d5 | 1139 | ND_PRINTK(3, dbg, "RA: adding default router\n"); |
1da177e4 | 1140 | |
0660e03f | 1141 | rt = rt6_add_dflt_router(&ipv6_hdr(skb)->saddr, skb->dev, pref); |
1da177e4 | 1142 | if (rt == NULL) { |
675418d5 JP |
1143 | ND_PRINTK(0, err, |
1144 | "RA: %s failed to add default route\n", | |
1145 | __func__); | |
1da177e4 LT |
1146 | return; |
1147 | } | |
1148 | ||
eb857186 | 1149 | neigh = dst_neigh_lookup(&rt->dst, &ipv6_hdr(skb)->saddr); |
1da177e4 | 1150 | if (neigh == NULL) { |
675418d5 JP |
1151 | ND_PRINTK(0, err, |
1152 | "RA: %s got default router without neighbour\n", | |
1153 | __func__); | |
94e187c0 | 1154 | ip6_rt_put(rt); |
1da177e4 LT |
1155 | return; |
1156 | } | |
1157 | neigh->flags |= NTF_ROUTER; | |
ebacaaa0 | 1158 | } else if (rt) { |
22441cfa | 1159 | rt->rt6i_flags = (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); |
1da177e4 LT |
1160 | } |
1161 | ||
1162 | if (rt) | |
1716a961 | 1163 | rt6_set_expires(rt, jiffies + (HZ * lifetime)); |
1da177e4 LT |
1164 | if (ra_msg->icmph.icmp6_hop_limit) { |
1165 | in6_dev->cnf.hop_limit = ra_msg->icmph.icmp6_hop_limit; | |
1166 | if (rt) | |
defb3519 DM |
1167 | dst_metric_set(&rt->dst, RTAX_HOPLIMIT, |
1168 | ra_msg->icmph.icmp6_hop_limit); | |
1da177e4 LT |
1169 | } |
1170 | ||
65f5c7c1 YH |
1171 | skip_defrtr: |
1172 | ||
1da177e4 LT |
1173 | /* |
1174 | * Update Reachable Time and Retrans Timer | |
1175 | */ | |
1176 | ||
1177 | if (in6_dev->nd_parms) { | |
1178 | unsigned long rtime = ntohl(ra_msg->retrans_timer); | |
1179 | ||
1180 | if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/HZ) { | |
1181 | rtime = (rtime*HZ)/1000; | |
1182 | if (rtime < HZ/10) | |
1183 | rtime = HZ/10; | |
1184 | in6_dev->nd_parms->retrans_time = rtime; | |
1185 | in6_dev->tstamp = jiffies; | |
1186 | inet6_ifinfo_notify(RTM_NEWLINK, in6_dev); | |
1187 | } | |
1188 | ||
1189 | rtime = ntohl(ra_msg->reachable_time); | |
1190 | if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/(3*HZ)) { | |
1191 | rtime = (rtime*HZ)/1000; | |
1192 | ||
1193 | if (rtime < HZ/10) | |
1194 | rtime = HZ/10; | |
1195 | ||
1196 | if (rtime != in6_dev->nd_parms->base_reachable_time) { | |
1197 | in6_dev->nd_parms->base_reachable_time = rtime; | |
1198 | in6_dev->nd_parms->gc_staletime = 3 * rtime; | |
1199 | in6_dev->nd_parms->reachable_time = neigh_rand_reach_time(rtime); | |
1200 | in6_dev->tstamp = jiffies; | |
1201 | inet6_ifinfo_notify(RTM_NEWLINK, in6_dev); | |
1202 | } | |
1203 | } | |
1204 | } | |
1205 | ||
fadf6bf0 TF |
1206 | skip_linkparms: |
1207 | ||
1da177e4 LT |
1208 | /* |
1209 | * Process options. | |
1210 | */ | |
1211 | ||
1212 | if (!neigh) | |
0660e03f | 1213 | neigh = __neigh_lookup(&nd_tbl, &ipv6_hdr(skb)->saddr, |
1da177e4 LT |
1214 | skb->dev, 1); |
1215 | if (neigh) { | |
1216 | u8 *lladdr = NULL; | |
1217 | if (ndopts.nd_opts_src_lladdr) { | |
1218 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, | |
1219 | skb->dev); | |
1220 | if (!lladdr) { | |
675418d5 JP |
1221 | ND_PRINTK(2, warn, |
1222 | "RA: invalid link-layer address length\n"); | |
1da177e4 LT |
1223 | goto out; |
1224 | } | |
1225 | } | |
1226 | neigh_update(neigh, lladdr, NUD_STALE, | |
1227 | NEIGH_UPDATE_F_WEAK_OVERRIDE| | |
1228 | NEIGH_UPDATE_F_OVERRIDE| | |
1229 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
1230 | NEIGH_UPDATE_F_ISROUTER); | |
1231 | } | |
1232 | ||
aeaf6e9d | 1233 | if (!ipv6_accept_ra(in6_dev)) |
31ce8c71 DW |
1234 | goto out; |
1235 | ||
70ceb4f5 | 1236 | #ifdef CONFIG_IPV6_ROUTE_INFO |
9f56220f AH |
1237 | if (ipv6_chk_addr(dev_net(in6_dev->dev), &ipv6_hdr(skb)->saddr, NULL, 0)) |
1238 | goto skip_routeinfo; | |
1239 | ||
09c884d4 | 1240 | if (in6_dev->cnf.accept_ra_rtr_pref && ndopts.nd_opts_ri) { |
70ceb4f5 YH |
1241 | struct nd_opt_hdr *p; |
1242 | for (p = ndopts.nd_opts_ri; | |
1243 | p; | |
1244 | p = ndisc_next_option(p, ndopts.nd_opts_ri_end)) { | |
6294e000 YH |
1245 | struct route_info *ri = (struct route_info *)p; |
1246 | #ifdef CONFIG_IPV6_NDISC_NODETYPE | |
1247 | if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT && | |
1248 | ri->prefix_len == 0) | |
1249 | continue; | |
1250 | #endif | |
1251 | if (ri->prefix_len > in6_dev->cnf.accept_ra_rt_info_max_plen) | |
09c884d4 | 1252 | continue; |
70ceb4f5 | 1253 | rt6_route_rcv(skb->dev, (u8*)p, (p->nd_opt_len) << 3, |
0660e03f | 1254 | &ipv6_hdr(skb)->saddr); |
70ceb4f5 YH |
1255 | } |
1256 | } | |
9f56220f AH |
1257 | |
1258 | skip_routeinfo: | |
70ceb4f5 YH |
1259 | #endif |
1260 | ||
de357cc0 | 1261 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 TF |
1262 | /* skip link-specific ndopts from interior routers */ |
1263 | if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT) | |
1264 | goto out; | |
de357cc0 | 1265 | #endif |
fadf6bf0 | 1266 | |
c4fd30eb | 1267 | if (in6_dev->cnf.accept_ra_pinfo && ndopts.nd_opts_pi) { |
1da177e4 LT |
1268 | struct nd_opt_hdr *p; |
1269 | for (p = ndopts.nd_opts_pi; | |
1270 | p; | |
1271 | p = ndisc_next_option(p, ndopts.nd_opts_pi_end)) { | |
e6bff995 NH |
1272 | addrconf_prefix_rcv(skb->dev, (u8 *)p, |
1273 | (p->nd_opt_len) << 3, | |
1274 | ndopts.nd_opts_src_lladdr != NULL); | |
1da177e4 LT |
1275 | } |
1276 | } | |
1277 | ||
1278 | if (ndopts.nd_opts_mtu) { | |
e69a4adc | 1279 | __be32 n; |
1da177e4 LT |
1280 | u32 mtu; |
1281 | ||
e69a4adc AV |
1282 | memcpy(&n, ((u8*)(ndopts.nd_opts_mtu+1))+2, sizeof(mtu)); |
1283 | mtu = ntohl(n); | |
1da177e4 LT |
1284 | |
1285 | if (mtu < IPV6_MIN_MTU || mtu > skb->dev->mtu) { | |
675418d5 | 1286 | ND_PRINTK(2, warn, "RA: invalid mtu: %d\n", mtu); |
1da177e4 LT |
1287 | } else if (in6_dev->cnf.mtu6 != mtu) { |
1288 | in6_dev->cnf.mtu6 = mtu; | |
1289 | ||
1290 | if (rt) | |
defb3519 | 1291 | dst_metric_set(&rt->dst, RTAX_MTU, mtu); |
1da177e4 LT |
1292 | |
1293 | rt6_mtu_change(skb->dev, mtu); | |
1294 | } | |
1295 | } | |
1ab1457c | 1296 | |
31910575 | 1297 | if (ndopts.nd_useropts) { |
61cf46ad YH |
1298 | struct nd_opt_hdr *p; |
1299 | for (p = ndopts.nd_useropts; | |
1300 | p; | |
1301 | p = ndisc_next_useropt(p, ndopts.nd_useropts_end)) { | |
1302 | ndisc_ra_useropt(skb, p); | |
31910575 PY |
1303 | } |
1304 | } | |
1305 | ||
1da177e4 | 1306 | if (ndopts.nd_opts_tgt_lladdr || ndopts.nd_opts_rh) { |
675418d5 | 1307 | ND_PRINTK(2, warn, "RA: invalid RA options\n"); |
1da177e4 LT |
1308 | } |
1309 | out: | |
94e187c0 | 1310 | ip6_rt_put(rt); |
eb857186 | 1311 | if (neigh) |
1da177e4 | 1312 | neigh_release(neigh); |
1da177e4 LT |
1313 | } |
1314 | ||
1315 | static void ndisc_redirect_rcv(struct sk_buff *skb) | |
1316 | { | |
093d04d4 DJ |
1317 | u8 *hdr; |
1318 | struct ndisc_options ndopts; | |
1319 | struct rd_msg *msg = (struct rd_msg *)skb_transport_header(skb); | |
1320 | u32 ndoptlen = skb->tail - (skb->transport_header + | |
1321 | offsetof(struct rd_msg, opt)); | |
1322 | ||
de357cc0 | 1323 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 TF |
1324 | switch (skb->ndisc_nodetype) { |
1325 | case NDISC_NODETYPE_HOST: | |
1326 | case NDISC_NODETYPE_NODEFAULT: | |
675418d5 JP |
1327 | ND_PRINTK(2, warn, |
1328 | "Redirect: from host or unauthorized router\n"); | |
fadf6bf0 TF |
1329 | return; |
1330 | } | |
de357cc0 | 1331 | #endif |
fadf6bf0 | 1332 | |
0660e03f | 1333 | if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) { |
675418d5 JP |
1334 | ND_PRINTK(2, warn, |
1335 | "Redirect: source address is not link-local\n"); | |
1da177e4 LT |
1336 | return; |
1337 | } | |
1338 | ||
093d04d4 DJ |
1339 | if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) |
1340 | return; | |
1341 | ||
1342 | if (!ndopts.nd_opts_rh) | |
1343 | return; | |
1344 | ||
1345 | hdr = (u8 *)ndopts.nd_opts_rh; | |
1346 | hdr += 8; | |
1347 | if (!pskb_pull(skb, hdr - skb_transport_header(skb))) | |
1348 | return; | |
1349 | ||
b94f1c09 | 1350 | icmpv6_notify(skb, NDISC_REDIRECT, 0, 0); |
1da177e4 LT |
1351 | } |
1352 | ||
4991969a | 1353 | void ndisc_send_redirect(struct sk_buff *skb, const struct in6_addr *target) |
1da177e4 | 1354 | { |
1762f7e8 | 1355 | struct net_device *dev = skb->dev; |
c346dca1 | 1356 | struct net *net = dev_net(dev); |
1762f7e8 | 1357 | struct sock *sk = net->ipv6.ndisc_sk; |
1da177e4 | 1358 | int len = sizeof(struct icmp6hdr) + 2 * sizeof(struct in6_addr); |
fbfe95a4 | 1359 | struct inet_peer *peer; |
1da177e4 LT |
1360 | struct sk_buff *buff; |
1361 | struct icmp6hdr *icmph; | |
1362 | struct in6_addr saddr_buf; | |
1363 | struct in6_addr *addrp; | |
1da177e4 LT |
1364 | struct rt6_info *rt; |
1365 | struct dst_entry *dst; | |
1366 | struct inet6_dev *idev; | |
4c9483b2 | 1367 | struct flowi6 fl6; |
1da177e4 | 1368 | u8 *opt; |
a7ae1992 | 1369 | int hlen, tlen; |
1da177e4 LT |
1370 | int rd_len; |
1371 | int err; | |
1da177e4 | 1372 | u8 ha_buf[MAX_ADDR_LEN], *ha = NULL; |
1d861aa4 | 1373 | bool ret; |
1da177e4 | 1374 | |
95c385b4 | 1375 | if (ipv6_get_lladdr(dev, &saddr_buf, IFA_F_TENTATIVE)) { |
675418d5 JP |
1376 | ND_PRINTK(2, warn, "Redirect: no link-local address on %s\n", |
1377 | dev->name); | |
1ab1457c YH |
1378 | return; |
1379 | } | |
1da177e4 | 1380 | |
0660e03f | 1381 | if (!ipv6_addr_equal(&ipv6_hdr(skb)->daddr, target) && |
bf0b48df | 1382 | ipv6_addr_type(target) != (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) { |
675418d5 JP |
1383 | ND_PRINTK(2, warn, |
1384 | "Redirect: target address is not link-local unicast\n"); | |
29556526 LY |
1385 | return; |
1386 | } | |
1387 | ||
4c9483b2 | 1388 | icmpv6_flow_init(sk, &fl6, NDISC_REDIRECT, |
95e41e93 | 1389 | &saddr_buf, &ipv6_hdr(skb)->saddr, dev->ifindex); |
1da177e4 | 1390 | |
4c9483b2 | 1391 | dst = ip6_route_output(net, NULL, &fl6); |
5095d64d RL |
1392 | if (dst->error) { |
1393 | dst_release(dst); | |
1da177e4 | 1394 | return; |
5095d64d | 1395 | } |
4c9483b2 | 1396 | dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), NULL, 0); |
452edd59 | 1397 | if (IS_ERR(dst)) |
1da177e4 | 1398 | return; |
1da177e4 LT |
1399 | |
1400 | rt = (struct rt6_info *) dst; | |
1401 | ||
1402 | if (rt->rt6i_flags & RTF_GATEWAY) { | |
675418d5 JP |
1403 | ND_PRINTK(2, warn, |
1404 | "Redirect: destination is not a neighbour\n"); | |
d73f0801 | 1405 | goto release; |
1da177e4 | 1406 | } |
1d861aa4 DM |
1407 | peer = inet_getpeer_v6(net->ipv6.peers, &rt->rt6i_dst.addr, 1); |
1408 | ret = inet_peer_xrlim_allow(peer, 1*HZ); | |
1409 | if (peer) | |
1410 | inet_putpeer(peer); | |
1411 | if (!ret) | |
d73f0801 | 1412 | goto release; |
1da177e4 LT |
1413 | |
1414 | if (dev->addr_len) { | |
4991969a DM |
1415 | struct neighbour *neigh = dst_neigh_lookup(skb_dst(skb), target); |
1416 | if (!neigh) { | |
675418d5 JP |
1417 | ND_PRINTK(2, warn, |
1418 | "Redirect: no neigh for target address\n"); | |
4991969a DM |
1419 | goto release; |
1420 | } | |
1421 | ||
1da177e4 LT |
1422 | read_lock_bh(&neigh->lock); |
1423 | if (neigh->nud_state & NUD_VALID) { | |
1424 | memcpy(ha_buf, neigh->ha, dev->addr_len); | |
1425 | read_unlock_bh(&neigh->lock); | |
1426 | ha = ha_buf; | |
1427 | len += ndisc_opt_addr_space(dev); | |
1428 | } else | |
1429 | read_unlock_bh(&neigh->lock); | |
4991969a DM |
1430 | |
1431 | neigh_release(neigh); | |
1da177e4 LT |
1432 | } |
1433 | ||
1434 | rd_len = min_t(unsigned int, | |
1435 | IPV6_MIN_MTU-sizeof(struct ipv6hdr)-len, skb->len + 8); | |
1436 | rd_len &= ~0x7; | |
1437 | len += rd_len; | |
1438 | ||
a7ae1992 HX |
1439 | hlen = LL_RESERVED_SPACE(dev); |
1440 | tlen = dev->needed_tailroom; | |
d54a81d3 DM |
1441 | buff = sock_alloc_send_skb(sk, |
1442 | (MAX_HEADER + sizeof(struct ipv6hdr) + | |
a7ae1992 | 1443 | len + hlen + tlen), |
1da177e4 LT |
1444 | 1, &err); |
1445 | if (buff == NULL) { | |
675418d5 JP |
1446 | ND_PRINTK(0, err, |
1447 | "Redirect: %s failed to allocate an skb, err=%d\n", | |
1448 | __func__, err); | |
d73f0801 | 1449 | goto release; |
1da177e4 LT |
1450 | } |
1451 | ||
a7ae1992 | 1452 | skb_reserve(buff, hlen); |
0660e03f | 1453 | ip6_nd_hdr(sk, buff, dev, &saddr_buf, &ipv6_hdr(skb)->saddr, |
1da177e4 LT |
1454 | IPPROTO_ICMPV6, len); |
1455 | ||
27a884dc | 1456 | skb_set_transport_header(buff, skb_tail_pointer(buff) - buff->data); |
d10ba34b ACM |
1457 | skb_put(buff, len); |
1458 | icmph = icmp6_hdr(buff); | |
1da177e4 LT |
1459 | |
1460 | memset(icmph, 0, sizeof(struct icmp6hdr)); | |
1461 | icmph->icmp6_type = NDISC_REDIRECT; | |
1462 | ||
1463 | /* | |
1464 | * copy target and destination addresses | |
1465 | */ | |
1466 | ||
1467 | addrp = (struct in6_addr *)(icmph + 1); | |
4e3fd7a0 | 1468 | *addrp = *target; |
1da177e4 | 1469 | addrp++; |
4e3fd7a0 | 1470 | *addrp = ipv6_hdr(skb)->daddr; |
1da177e4 LT |
1471 | |
1472 | opt = (u8*) (addrp + 1); | |
1473 | ||
1474 | /* | |
1475 | * include target_address option | |
1476 | */ | |
1477 | ||
1478 | if (ha) | |
1479 | opt = ndisc_fill_addr_option(opt, ND_OPT_TARGET_LL_ADDR, ha, | |
1480 | dev->addr_len, dev->type); | |
1481 | ||
1482 | /* | |
1483 | * build redirect option and copy skb over to the new packet. | |
1484 | */ | |
1485 | ||
1ab1457c | 1486 | memset(opt, 0, 8); |
1da177e4 LT |
1487 | *(opt++) = ND_OPT_REDIRECT_HDR; |
1488 | *(opt++) = (rd_len >> 3); | |
1489 | opt += 6; | |
1490 | ||
0660e03f | 1491 | memcpy(opt, ipv6_hdr(skb), rd_len - 8); |
1da177e4 | 1492 | |
0660e03f | 1493 | icmph->icmp6_cksum = csum_ipv6_magic(&saddr_buf, &ipv6_hdr(skb)->saddr, |
1da177e4 | 1494 | len, IPPROTO_ICMPV6, |
07f0757a | 1495 | csum_partial(icmph, len, 0)); |
1da177e4 | 1496 | |
adf30907 | 1497 | skb_dst_set(buff, dst); |
cfdf7647 ED |
1498 | rcu_read_lock(); |
1499 | idev = __in6_dev_get(dst->dev); | |
edf391ff | 1500 | IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len); |
b2e0b385 | 1501 | err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, buff, NULL, dst->dev, |
6e23ae2a | 1502 | dst_output); |
1da177e4 | 1503 | if (!err) { |
5c5d244b | 1504 | ICMP6MSGOUT_INC_STATS(net, idev, NDISC_REDIRECT); |
a862f6a6 | 1505 | ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); |
1da177e4 LT |
1506 | } |
1507 | ||
cfdf7647 | 1508 | rcu_read_unlock(); |
d73f0801 IJ |
1509 | return; |
1510 | ||
1511 | release: | |
1512 | dst_release(dst); | |
1da177e4 LT |
1513 | } |
1514 | ||
1515 | static void pndisc_redo(struct sk_buff *skb) | |
1516 | { | |
140e26fc | 1517 | ndisc_recv_ns(skb); |
1da177e4 LT |
1518 | kfree_skb(skb); |
1519 | } | |
1520 | ||
1521 | int ndisc_rcv(struct sk_buff *skb) | |
1522 | { | |
1523 | struct nd_msg *msg; | |
1524 | ||
1525 | if (!pskb_may_pull(skb, skb->len)) | |
1526 | return 0; | |
1527 | ||
9c70220b | 1528 | msg = (struct nd_msg *)skb_transport_header(skb); |
1da177e4 | 1529 | |
9c70220b | 1530 | __skb_push(skb, skb->data - skb_transport_header(skb)); |
1da177e4 | 1531 | |
0660e03f | 1532 | if (ipv6_hdr(skb)->hop_limit != 255) { |
675418d5 JP |
1533 | ND_PRINTK(2, warn, "NDISC: invalid hop-limit: %d\n", |
1534 | ipv6_hdr(skb)->hop_limit); | |
1da177e4 LT |
1535 | return 0; |
1536 | } | |
1537 | ||
1538 | if (msg->icmph.icmp6_code != 0) { | |
675418d5 JP |
1539 | ND_PRINTK(2, warn, "NDISC: invalid ICMPv6 code: %d\n", |
1540 | msg->icmph.icmp6_code); | |
1da177e4 LT |
1541 | return 0; |
1542 | } | |
1543 | ||
a61bbcf2 PM |
1544 | memset(NEIGH_CB(skb), 0, sizeof(struct neighbour_cb)); |
1545 | ||
1da177e4 LT |
1546 | switch (msg->icmph.icmp6_type) { |
1547 | case NDISC_NEIGHBOUR_SOLICITATION: | |
1548 | ndisc_recv_ns(skb); | |
1549 | break; | |
1550 | ||
1551 | case NDISC_NEIGHBOUR_ADVERTISEMENT: | |
1552 | ndisc_recv_na(skb); | |
1553 | break; | |
1554 | ||
1555 | case NDISC_ROUTER_SOLICITATION: | |
1556 | ndisc_recv_rs(skb); | |
1557 | break; | |
1558 | ||
1559 | case NDISC_ROUTER_ADVERTISEMENT: | |
1560 | ndisc_router_discovery(skb); | |
1561 | break; | |
1562 | ||
1563 | case NDISC_REDIRECT: | |
1564 | ndisc_redirect_rcv(skb); | |
1565 | break; | |
3ff50b79 | 1566 | } |
1da177e4 LT |
1567 | |
1568 | return 0; | |
1569 | } | |
1570 | ||
1571 | static int ndisc_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1572 | { | |
1573 | struct net_device *dev = ptr; | |
c346dca1 | 1574 | struct net *net = dev_net(dev); |
5cb04436 | 1575 | struct inet6_dev *idev; |
1da177e4 LT |
1576 | |
1577 | switch (event) { | |
1578 | case NETDEV_CHANGEADDR: | |
1579 | neigh_changeaddr(&nd_tbl, dev); | |
5b7c931d | 1580 | fib6_run_gc(~0UL, net); |
5cb04436 HFS |
1581 | idev = in6_dev_get(dev); |
1582 | if (!idev) | |
1583 | break; | |
1584 | if (idev->cnf.ndisc_notify) | |
1585 | ndisc_send_unsol_na(dev); | |
1586 | in6_dev_put(idev); | |
1da177e4 LT |
1587 | break; |
1588 | case NETDEV_DOWN: | |
1589 | neigh_ifdown(&nd_tbl, dev); | |
5b7c931d | 1590 | fib6_run_gc(~0UL, net); |
1da177e4 | 1591 | break; |
f47b9464 BH |
1592 | case NETDEV_NOTIFY_PEERS: |
1593 | ndisc_send_unsol_na(dev); | |
1594 | break; | |
1da177e4 LT |
1595 | default: |
1596 | break; | |
1597 | } | |
1598 | ||
1599 | return NOTIFY_DONE; | |
1600 | } | |
1601 | ||
1602 | static struct notifier_block ndisc_netdev_notifier = { | |
1603 | .notifier_call = ndisc_netdev_event, | |
1604 | }; | |
1605 | ||
1606 | #ifdef CONFIG_SYSCTL | |
1607 | static void ndisc_warn_deprecated_sysctl(struct ctl_table *ctl, | |
1608 | const char *func, const char *dev_name) | |
1609 | { | |
1610 | static char warncomm[TASK_COMM_LEN]; | |
1611 | static int warned; | |
1612 | if (strcmp(warncomm, current->comm) && warned < 5) { | |
1613 | strcpy(warncomm, current->comm); | |
f3213831 | 1614 | pr_warn("process `%s' is using deprecated sysctl (%s) net.ipv6.neigh.%s.%s - use net.ipv6.neigh.%s.%s_ms instead\n", |
1da177e4 LT |
1615 | warncomm, func, |
1616 | dev_name, ctl->procname, | |
1617 | dev_name, ctl->procname); | |
1618 | warned++; | |
1619 | } | |
1620 | } | |
1621 | ||
8d65af78 | 1622 | int ndisc_ifinfo_sysctl_change(struct ctl_table *ctl, int write, void __user *buffer, size_t *lenp, loff_t *ppos) |
1da177e4 LT |
1623 | { |
1624 | struct net_device *dev = ctl->extra1; | |
1625 | struct inet6_dev *idev; | |
1626 | int ret; | |
1627 | ||
d12af679 EB |
1628 | if ((strcmp(ctl->procname, "retrans_time") == 0) || |
1629 | (strcmp(ctl->procname, "base_reachable_time") == 0)) | |
1da177e4 LT |
1630 | ndisc_warn_deprecated_sysctl(ctl, "syscall", dev ? dev->name : "default"); |
1631 | ||
d12af679 | 1632 | if (strcmp(ctl->procname, "retrans_time") == 0) |
8d65af78 | 1633 | ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
d12af679 EB |
1634 | |
1635 | else if (strcmp(ctl->procname, "base_reachable_time") == 0) | |
1da177e4 | 1636 | ret = proc_dointvec_jiffies(ctl, write, |
8d65af78 | 1637 | buffer, lenp, ppos); |
d12af679 EB |
1638 | |
1639 | else if ((strcmp(ctl->procname, "retrans_time_ms") == 0) || | |
ad02ac14 | 1640 | (strcmp(ctl->procname, "base_reachable_time_ms") == 0)) |
1da177e4 | 1641 | ret = proc_dointvec_ms_jiffies(ctl, write, |
8d65af78 | 1642 | buffer, lenp, ppos); |
d12af679 | 1643 | else |
1da177e4 | 1644 | ret = -1; |
1da177e4 LT |
1645 | |
1646 | if (write && ret == 0 && dev && (idev = in6_dev_get(dev)) != NULL) { | |
d12af679 | 1647 | if (ctl->data == &idev->nd_parms->base_reachable_time) |
1da177e4 LT |
1648 | idev->nd_parms->reachable_time = neigh_rand_reach_time(idev->nd_parms->base_reachable_time); |
1649 | idev->tstamp = jiffies; | |
1650 | inet6_ifinfo_notify(RTM_NEWLINK, idev); | |
1651 | in6_dev_put(idev); | |
1652 | } | |
1653 | return ret; | |
1654 | } | |
1655 | ||
1da177e4 LT |
1656 | |
1657 | #endif | |
1658 | ||
2c8c1e72 | 1659 | static int __net_init ndisc_net_init(struct net *net) |
1da177e4 LT |
1660 | { |
1661 | struct ipv6_pinfo *np; | |
1662 | struct sock *sk; | |
1ab1457c | 1663 | int err; |
1da177e4 | 1664 | |
1ed8516f DL |
1665 | err = inet_ctl_sock_create(&sk, PF_INET6, |
1666 | SOCK_RAW, IPPROTO_ICMPV6, net); | |
1da177e4 | 1667 | if (err < 0) { |
675418d5 JP |
1668 | ND_PRINTK(0, err, |
1669 | "NDISC: Failed to initialize the control socket (err %d)\n", | |
1670 | err); | |
1da177e4 LT |
1671 | return err; |
1672 | } | |
1673 | ||
1ed8516f | 1674 | net->ipv6.ndisc_sk = sk; |
1762f7e8 | 1675 | |
1da177e4 | 1676 | np = inet6_sk(sk); |
1da177e4 LT |
1677 | np->hop_limit = 255; |
1678 | /* Do not loopback ndisc messages */ | |
1679 | np->mc_loop = 0; | |
1da177e4 | 1680 | |
1762f7e8 DL |
1681 | return 0; |
1682 | } | |
1683 | ||
2c8c1e72 | 1684 | static void __net_exit ndisc_net_exit(struct net *net) |
1762f7e8 | 1685 | { |
1ed8516f | 1686 | inet_ctl_sock_destroy(net->ipv6.ndisc_sk); |
1762f7e8 DL |
1687 | } |
1688 | ||
1689 | static struct pernet_operations ndisc_net_ops = { | |
1690 | .init = ndisc_net_init, | |
1691 | .exit = ndisc_net_exit, | |
1692 | }; | |
1693 | ||
1694 | int __init ndisc_init(void) | |
1695 | { | |
1696 | int err; | |
1697 | ||
1698 | err = register_pernet_subsys(&ndisc_net_ops); | |
1699 | if (err) | |
1700 | return err; | |
1ab1457c YH |
1701 | /* |
1702 | * Initialize the neighbour table | |
1703 | */ | |
1da177e4 LT |
1704 | neigh_table_init(&nd_tbl); |
1705 | ||
1706 | #ifdef CONFIG_SYSCTL | |
54716e3b | 1707 | err = neigh_sysctl_register(NULL, &nd_tbl.parms, "ipv6", |
f8572d8f | 1708 | &ndisc_ifinfo_sysctl_change); |
1762f7e8 DL |
1709 | if (err) |
1710 | goto out_unregister_pernet; | |
1da177e4 | 1711 | #endif |
1762f7e8 DL |
1712 | err = register_netdevice_notifier(&ndisc_netdev_notifier); |
1713 | if (err) | |
1714 | goto out_unregister_sysctl; | |
1715 | out: | |
1716 | return err; | |
1da177e4 | 1717 | |
1762f7e8 DL |
1718 | out_unregister_sysctl: |
1719 | #ifdef CONFIG_SYSCTL | |
1720 | neigh_sysctl_unregister(&nd_tbl.parms); | |
1721 | out_unregister_pernet: | |
1722 | #endif | |
1723 | unregister_pernet_subsys(&ndisc_net_ops); | |
1724 | goto out; | |
1da177e4 LT |
1725 | } |
1726 | ||
1727 | void ndisc_cleanup(void) | |
1728 | { | |
36f73d0c | 1729 | unregister_netdevice_notifier(&ndisc_netdev_notifier); |
1da177e4 LT |
1730 | #ifdef CONFIG_SYSCTL |
1731 | neigh_sysctl_unregister(&nd_tbl.parms); | |
1732 | #endif | |
1733 | neigh_table_clear(&nd_tbl); | |
1762f7e8 | 1734 | unregister_pernet_subsys(&ndisc_net_ops); |
1da177e4 | 1735 | } |