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 | { | |
154 | int space = NDISC_OPT_SPACE(data_len); | |
155 | int pad = ndisc_addr_option_pad(addr_type); | |
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 | ||
305d552a BH |
373 | 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 | ||
434 | EXPORT_SYMBOL(ndisc_build_skb); | |
435 | ||
436 | void ndisc_send_skb(struct sk_buff *skb, | |
437 | struct net_device *dev, | |
438 | struct neighbour *neigh, | |
439 | const struct in6_addr *daddr, | |
440 | const struct in6_addr *saddr, | |
441 | struct icmp6hdr *icmp6h) | |
442 | { | |
4c9483b2 | 443 | struct flowi6 fl6; |
305d552a BH |
444 | struct dst_entry *dst; |
445 | struct net *net = dev_net(dev); | |
446 | struct sock *sk = net->ipv6.ndisc_sk; | |
447 | struct inet6_dev *idev; | |
448 | int err; | |
449 | u8 type; | |
450 | ||
451 | type = icmp6h->icmp6_type; | |
452 | ||
4c9483b2 | 453 | icmpv6_flow_init(sk, &fl6, type, saddr, daddr, dev->ifindex); |
87a11578 | 454 | dst = icmp6_dst_alloc(dev, neigh, &fl6); |
452edd59 | 455 | if (IS_ERR(dst)) { |
305d552a BH |
456 | kfree_skb(skb); |
457 | return; | |
458 | } | |
459 | ||
adf30907 | 460 | skb_dst_set(skb, dst); |
e1ec7842 | 461 | |
cfdf7647 ED |
462 | rcu_read_lock(); |
463 | idev = __in6_dev_get(dst->dev); | |
edf391ff | 464 | IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len); |
e1ec7842 | 465 | |
b2e0b385 | 466 | err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, dst->dev, |
6e23ae2a | 467 | dst_output); |
1da177e4 | 468 | if (!err) { |
5c5d244b | 469 | ICMP6MSGOUT_INC_STATS(net, idev, type); |
a862f6a6 | 470 | ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); |
1da177e4 LT |
471 | } |
472 | ||
cfdf7647 | 473 | rcu_read_unlock(); |
1ab1457c | 474 | } |
1da177e4 | 475 | |
305d552a BH |
476 | EXPORT_SYMBOL(ndisc_send_skb); |
477 | ||
478 | /* | |
479 | * Send a Neighbour Discover packet | |
480 | */ | |
481 | static void __ndisc_send(struct net_device *dev, | |
482 | struct neighbour *neigh, | |
483 | const struct in6_addr *daddr, | |
484 | const struct in6_addr *saddr, | |
485 | struct icmp6hdr *icmp6h, const struct in6_addr *target, | |
486 | int llinfo) | |
487 | { | |
488 | struct sk_buff *skb; | |
489 | ||
490 | skb = ndisc_build_skb(dev, daddr, saddr, icmp6h, target, llinfo); | |
491 | if (!skb) | |
492 | return; | |
493 | ||
494 | ndisc_send_skb(skb, dev, neigh, daddr, saddr, icmp6h); | |
495 | } | |
496 | ||
e1ec7842 | 497 | static void ndisc_send_na(struct net_device *dev, struct neighbour *neigh, |
9acd9f3a YH |
498 | const struct in6_addr *daddr, |
499 | const struct in6_addr *solicited_addr, | |
500 | int router, int solicited, int override, int inc_opt) | |
e1ec7842 YH |
501 | { |
502 | struct in6_addr tmpaddr; | |
503 | struct inet6_ifaddr *ifp; | |
9acd9f3a | 504 | const struct in6_addr *src_addr; |
e1ec7842 YH |
505 | struct icmp6hdr icmp6h = { |
506 | .icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT, | |
507 | }; | |
508 | ||
509 | /* for anycast or proxy, solicited_addr != src_addr */ | |
c346dca1 | 510 | ifp = ipv6_get_ifaddr(dev_net(dev), solicited_addr, dev, 1); |
e1ec7842 YH |
511 | if (ifp) { |
512 | src_addr = solicited_addr; | |
513 | if (ifp->flags & IFA_F_OPTIMISTIC) | |
514 | override = 0; | |
9f888160 | 515 | inc_opt |= ifp->idev->cnf.force_tllao; |
e1ec7842 YH |
516 | in6_ifa_put(ifp); |
517 | } else { | |
191cd582 | 518 | if (ipv6_dev_get_saddr(dev_net(dev), dev, daddr, |
c346dca1 | 519 | inet6_sk(dev_net(dev)->ipv6.ndisc_sk)->srcprefs, |
7cbca67c | 520 | &tmpaddr)) |
e1ec7842 YH |
521 | return; |
522 | src_addr = &tmpaddr; | |
523 | } | |
524 | ||
525 | icmp6h.icmp6_router = router; | |
526 | icmp6h.icmp6_solicited = solicited; | |
527 | icmp6h.icmp6_override = override; | |
528 | ||
529 | __ndisc_send(dev, neigh, daddr, src_addr, | |
530 | &icmp6h, solicited_addr, | |
14878f75 | 531 | inc_opt ? ND_OPT_TARGET_LL_ADDR : 0); |
e1ec7842 YH |
532 | } |
533 | ||
f47b9464 BH |
534 | static void ndisc_send_unsol_na(struct net_device *dev) |
535 | { | |
536 | struct inet6_dev *idev; | |
537 | struct inet6_ifaddr *ifa; | |
60713a0c | 538 | struct in6_addr mcaddr = IN6ADDR_LINKLOCAL_ALLNODES_INIT; |
f47b9464 BH |
539 | |
540 | idev = in6_dev_get(dev); | |
541 | if (!idev) | |
542 | return; | |
543 | ||
544 | read_lock_bh(&idev->lock); | |
545 | list_for_each_entry(ifa, &idev->addr_list, if_list) { | |
f47b9464 BH |
546 | ndisc_send_na(dev, NULL, &mcaddr, &ifa->addr, |
547 | /*router=*/ !!idev->cnf.forwarding, | |
548 | /*solicited=*/ false, /*override=*/ true, | |
549 | /*inc_opt=*/ true); | |
550 | } | |
551 | read_unlock_bh(&idev->lock); | |
552 | ||
553 | in6_dev_put(idev); | |
554 | } | |
555 | ||
1da177e4 | 556 | void ndisc_send_ns(struct net_device *dev, struct neighbour *neigh, |
9acd9f3a YH |
557 | const struct in6_addr *solicit, |
558 | const struct in6_addr *daddr, const struct in6_addr *saddr) | |
1da177e4 | 559 | { |
1da177e4 | 560 | struct in6_addr addr_buf; |
e1ec7842 YH |
561 | struct icmp6hdr icmp6h = { |
562 | .icmp6_type = NDISC_NEIGHBOUR_SOLICITATION, | |
563 | }; | |
1da177e4 LT |
564 | |
565 | if (saddr == NULL) { | |
95c385b4 NH |
566 | if (ipv6_get_lladdr(dev, &addr_buf, |
567 | (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC))) | |
1da177e4 LT |
568 | return; |
569 | saddr = &addr_buf; | |
570 | } | |
571 | ||
e1ec7842 YH |
572 | __ndisc_send(dev, neigh, daddr, saddr, |
573 | &icmp6h, solicit, | |
14878f75 | 574 | !ipv6_addr_any(saddr) ? ND_OPT_SOURCE_LL_ADDR : 0); |
1da177e4 LT |
575 | } |
576 | ||
9acd9f3a YH |
577 | void ndisc_send_rs(struct net_device *dev, const struct in6_addr *saddr, |
578 | const struct in6_addr *daddr) | |
1da177e4 | 579 | { |
e1ec7842 YH |
580 | struct icmp6hdr icmp6h = { |
581 | .icmp6_type = NDISC_ROUTER_SOLICITATION, | |
582 | }; | |
95c385b4 | 583 | int send_sllao = dev->addr_len; |
95c385b4 NH |
584 | |
585 | #ifdef CONFIG_IPV6_OPTIMISTIC_DAD | |
586 | /* | |
587 | * According to section 2.2 of RFC 4429, we must not | |
588 | * send router solicitations with a sllao from | |
589 | * optimistic addresses, but we may send the solicitation | |
590 | * if we don't include the sllao. So here we check | |
591 | * if our address is optimistic, and if so, we | |
bea85195 | 592 | * suppress the inclusion of the sllao. |
95c385b4 NH |
593 | */ |
594 | if (send_sllao) { | |
c346dca1 | 595 | struct inet6_ifaddr *ifp = ipv6_get_ifaddr(dev_net(dev), saddr, |
1cab3da6 | 596 | dev, 1); |
95c385b4 NH |
597 | if (ifp) { |
598 | if (ifp->flags & IFA_F_OPTIMISTIC) { | |
ca043569 | 599 | send_sllao = 0; |
95c385b4 | 600 | } |
ca043569 | 601 | in6_ifa_put(ifp); |
95c385b4 NH |
602 | } else { |
603 | send_sllao = 0; | |
604 | } | |
605 | } | |
606 | #endif | |
e1ec7842 YH |
607 | __ndisc_send(dev, NULL, daddr, saddr, |
608 | &icmp6h, NULL, | |
14878f75 | 609 | send_sllao ? ND_OPT_SOURCE_LL_ADDR : 0); |
1da177e4 | 610 | } |
1ab1457c | 611 | |
1da177e4 LT |
612 | |
613 | static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb) | |
614 | { | |
615 | /* | |
616 | * "The sender MUST return an ICMP | |
617 | * destination unreachable" | |
618 | */ | |
619 | dst_link_failure(skb); | |
620 | kfree_skb(skb); | |
621 | } | |
622 | ||
623 | /* Called with locked neigh: either read or both */ | |
624 | ||
625 | static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb) | |
626 | { | |
627 | struct in6_addr *saddr = NULL; | |
628 | struct in6_addr mcaddr; | |
629 | struct net_device *dev = neigh->dev; | |
630 | struct in6_addr *target = (struct in6_addr *)&neigh->primary_key; | |
631 | int probes = atomic_read(&neigh->probes); | |
632 | ||
c346dca1 | 633 | if (skb && ipv6_chk_addr(dev_net(dev), &ipv6_hdr(skb)->saddr, dev, 1)) |
0660e03f | 634 | saddr = &ipv6_hdr(skb)->saddr; |
1da177e4 LT |
635 | |
636 | if ((probes -= neigh->parms->ucast_probes) < 0) { | |
637 | if (!(neigh->nud_state & NUD_VALID)) { | |
675418d5 JP |
638 | ND_PRINTK(1, dbg, |
639 | "%s: trying to ucast probe in NUD_INVALID: %pI6\n", | |
640 | __func__, target); | |
1da177e4 LT |
641 | } |
642 | ndisc_send_ns(dev, neigh, target, target, saddr); | |
643 | } else if ((probes -= neigh->parms->app_probes) < 0) { | |
644 | #ifdef CONFIG_ARPD | |
645 | neigh_app_ns(neigh); | |
646 | #endif | |
647 | } else { | |
648 | addrconf_addr_solict_mult(target, &mcaddr); | |
649 | ndisc_send_ns(dev, NULL, target, &mcaddr, saddr); | |
650 | } | |
651 | } | |
652 | ||
0736ffc0 YH |
653 | static int pndisc_is_router(const void *pkey, |
654 | struct net_device *dev) | |
fa86d322 PE |
655 | { |
656 | struct pneigh_entry *n; | |
0736ffc0 | 657 | int ret = -1; |
fa86d322 PE |
658 | |
659 | read_lock_bh(&nd_tbl.lock); | |
0736ffc0 YH |
660 | n = __pneigh_lookup(&nd_tbl, dev_net(dev), pkey, dev); |
661 | if (n) | |
662 | ret = !!(n->flags & NTF_ROUTER); | |
fa86d322 PE |
663 | read_unlock_bh(&nd_tbl.lock); |
664 | ||
0736ffc0 | 665 | return ret; |
fa86d322 PE |
666 | } |
667 | ||
1da177e4 LT |
668 | static void ndisc_recv_ns(struct sk_buff *skb) |
669 | { | |
9c70220b | 670 | struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb); |
b71d1d42 ED |
671 | const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; |
672 | const struct in6_addr *daddr = &ipv6_hdr(skb)->daddr; | |
1da177e4 | 673 | u8 *lladdr = NULL; |
27a884dc ACM |
674 | u32 ndoptlen = skb->tail - (skb->transport_header + |
675 | offsetof(struct nd_msg, opt)); | |
1da177e4 LT |
676 | struct ndisc_options ndopts; |
677 | struct net_device *dev = skb->dev; | |
678 | struct inet6_ifaddr *ifp; | |
679 | struct inet6_dev *idev = NULL; | |
680 | struct neighbour *neigh; | |
681 | int dad = ipv6_addr_any(saddr); | |
a50feda5 | 682 | bool inc; |
0736ffc0 | 683 | int is_router = -1; |
1da177e4 LT |
684 | |
685 | if (ipv6_addr_is_multicast(&msg->target)) { | |
675418d5 | 686 | ND_PRINTK(2, warn, "NS: multicast target address\n"); |
1da177e4 LT |
687 | return; |
688 | } | |
689 | ||
690 | /* | |
691 | * RFC2461 7.1.1: | |
692 | * DAD has to be destined for solicited node multicast address. | |
693 | */ | |
694 | if (dad && | |
695 | !(daddr->s6_addr32[0] == htonl(0xff020000) && | |
696 | daddr->s6_addr32[1] == htonl(0x00000000) && | |
697 | daddr->s6_addr32[2] == htonl(0x00000001) && | |
698 | daddr->s6_addr [12] == 0xff )) { | |
675418d5 | 699 | ND_PRINTK(2, warn, "NS: bad DAD packet (wrong destination)\n"); |
1da177e4 LT |
700 | return; |
701 | } | |
702 | ||
703 | if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) { | |
675418d5 | 704 | ND_PRINTK(2, warn, "NS: invalid ND options\n"); |
1da177e4 LT |
705 | return; |
706 | } | |
707 | ||
708 | if (ndopts.nd_opts_src_lladdr) { | |
709 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, dev); | |
710 | if (!lladdr) { | |
675418d5 JP |
711 | ND_PRINTK(2, warn, |
712 | "NS: invalid link-layer address length\n"); | |
1da177e4 LT |
713 | return; |
714 | } | |
715 | ||
716 | /* RFC2461 7.1.1: | |
1ab1457c YH |
717 | * If the IP source address is the unspecified address, |
718 | * there MUST NOT be source link-layer address option | |
1da177e4 LT |
719 | * in the message. |
720 | */ | |
721 | if (dad) { | |
675418d5 JP |
722 | ND_PRINTK(2, warn, |
723 | "NS: bad DAD packet (link-layer address option)\n"); | |
1da177e4 LT |
724 | return; |
725 | } | |
726 | } | |
727 | ||
728 | inc = ipv6_addr_is_multicast(daddr); | |
729 | ||
c346dca1 | 730 | ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1); |
a18bc695 | 731 | if (ifp) { |
95c385b4 NH |
732 | |
733 | if (ifp->flags & (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC)) { | |
734 | if (dad) { | |
95c385b4 NH |
735 | /* |
736 | * We are colliding with another node | |
737 | * who is doing DAD | |
738 | * so fail our DAD process | |
739 | */ | |
740 | addrconf_dad_failure(ifp); | |
9e3be4b3 | 741 | return; |
95c385b4 NH |
742 | } else { |
743 | /* | |
744 | * This is not a dad solicitation. | |
745 | * If we are an optimistic node, | |
746 | * we should respond. | |
747 | * Otherwise, we should ignore it. | |
748 | */ | |
749 | if (!(ifp->flags & IFA_F_OPTIMISTIC)) | |
1da177e4 | 750 | goto out; |
1da177e4 | 751 | } |
1da177e4 LT |
752 | } |
753 | ||
754 | idev = ifp->idev; | |
755 | } else { | |
53b7997f YH |
756 | struct net *net = dev_net(dev); |
757 | ||
1da177e4 LT |
758 | idev = in6_dev_get(dev); |
759 | if (!idev) { | |
760 | /* XXX: count this drop? */ | |
761 | return; | |
762 | } | |
763 | ||
53b7997f | 764 | if (ipv6_chk_acast_addr(net, dev, &msg->target) || |
1ab1457c | 765 | (idev->cnf.forwarding && |
53b7997f | 766 | (net->ipv6.devconf_all->proxy_ndp || idev->cnf.proxy_ndp) && |
0736ffc0 | 767 | (is_router = pndisc_is_router(&msg->target, dev)) >= 0)) { |
a61bbcf2 | 768 | if (!(NEIGH_CB(skb)->flags & LOCALLY_ENQUEUED) && |
1da177e4 LT |
769 | skb->pkt_type != PACKET_HOST && |
770 | inc != 0 && | |
771 | idev->nd_parms->proxy_delay != 0) { | |
772 | /* | |
773 | * for anycast or proxy, | |
1ab1457c YH |
774 | * sender should delay its response |
775 | * by a random time between 0 and | |
1da177e4 LT |
776 | * MAX_ANYCAST_DELAY_TIME seconds. |
777 | * (RFC2461) -- yoshfuji | |
778 | */ | |
779 | struct sk_buff *n = skb_clone(skb, GFP_ATOMIC); | |
780 | if (n) | |
781 | pneigh_enqueue(&nd_tbl, idev->nd_parms, n); | |
782 | goto out; | |
783 | } | |
784 | } else | |
785 | goto out; | |
786 | } | |
787 | ||
0736ffc0 YH |
788 | if (is_router < 0) |
789 | is_router = !!idev->cnf.forwarding; | |
62dd9318 | 790 | |
1da177e4 | 791 | if (dad) { |
f3ee4010 | 792 | ndisc_send_na(dev, NULL, &in6addr_linklocal_allnodes, &msg->target, |
62dd9318 | 793 | is_router, 0, (ifp != NULL), 1); |
1da177e4 LT |
794 | goto out; |
795 | } | |
796 | ||
797 | if (inc) | |
798 | NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_mcast); | |
799 | else | |
800 | NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_ucast); | |
801 | ||
1ab1457c | 802 | /* |
1da177e4 LT |
803 | * update / create cache entry |
804 | * for the source address | |
805 | */ | |
806 | neigh = __neigh_lookup(&nd_tbl, saddr, dev, | |
807 | !inc || lladdr || !dev->addr_len); | |
808 | if (neigh) | |
1ab1457c | 809 | neigh_update(neigh, lladdr, NUD_STALE, |
1da177e4 LT |
810 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
811 | NEIGH_UPDATE_F_OVERRIDE); | |
3b04ddde | 812 | if (neigh || !dev->header_ops) { |
1da177e4 | 813 | ndisc_send_na(dev, neigh, saddr, &msg->target, |
62dd9318 | 814 | is_router, |
1da177e4 LT |
815 | 1, (ifp != NULL && inc), inc); |
816 | if (neigh) | |
817 | neigh_release(neigh); | |
818 | } | |
819 | ||
820 | out: | |
821 | if (ifp) | |
822 | in6_ifa_put(ifp); | |
823 | else | |
824 | in6_dev_put(idev); | |
1da177e4 LT |
825 | } |
826 | ||
827 | static void ndisc_recv_na(struct sk_buff *skb) | |
828 | { | |
9c70220b | 829 | struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb); |
b71d1d42 ED |
830 | const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; |
831 | const struct in6_addr *daddr = &ipv6_hdr(skb)->daddr; | |
1da177e4 | 832 | u8 *lladdr = NULL; |
27a884dc ACM |
833 | u32 ndoptlen = skb->tail - (skb->transport_header + |
834 | offsetof(struct nd_msg, opt)); | |
1da177e4 LT |
835 | struct ndisc_options ndopts; |
836 | struct net_device *dev = skb->dev; | |
837 | struct inet6_ifaddr *ifp; | |
838 | struct neighbour *neigh; | |
839 | ||
840 | if (skb->len < sizeof(struct nd_msg)) { | |
675418d5 | 841 | ND_PRINTK(2, warn, "NA: packet too short\n"); |
1da177e4 LT |
842 | return; |
843 | } | |
844 | ||
845 | if (ipv6_addr_is_multicast(&msg->target)) { | |
675418d5 | 846 | ND_PRINTK(2, warn, "NA: target address is multicast\n"); |
1da177e4 LT |
847 | return; |
848 | } | |
849 | ||
850 | if (ipv6_addr_is_multicast(daddr) && | |
851 | msg->icmph.icmp6_solicited) { | |
675418d5 | 852 | ND_PRINTK(2, warn, "NA: solicited NA is multicasted\n"); |
1da177e4 LT |
853 | return; |
854 | } | |
1ab1457c | 855 | |
1da177e4 | 856 | if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) { |
675418d5 | 857 | ND_PRINTK(2, warn, "NS: invalid ND option\n"); |
1da177e4 LT |
858 | return; |
859 | } | |
860 | if (ndopts.nd_opts_tgt_lladdr) { | |
861 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, dev); | |
862 | if (!lladdr) { | |
675418d5 JP |
863 | ND_PRINTK(2, warn, |
864 | "NA: invalid link-layer address length\n"); | |
1da177e4 LT |
865 | return; |
866 | } | |
867 | } | |
c346dca1 | 868 | ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1); |
a18bc695 | 869 | if (ifp) { |
bd015928 DW |
870 | if (skb->pkt_type != PACKET_LOOPBACK |
871 | && (ifp->flags & IFA_F_TENTATIVE)) { | |
872 | addrconf_dad_failure(ifp); | |
873 | return; | |
1da177e4 LT |
874 | } |
875 | /* What should we make now? The advertisement | |
876 | is invalid, but ndisc specs say nothing | |
877 | about it. It could be misconfiguration, or | |
878 | an smart proxy agent tries to help us :-) | |
24fc7b86 JS |
879 | |
880 | We should not print the error if NA has been | |
881 | received from loopback - it is just our own | |
882 | unsolicited advertisement. | |
1da177e4 | 883 | */ |
24fc7b86 | 884 | if (skb->pkt_type != PACKET_LOOPBACK) |
675418d5 JP |
885 | ND_PRINTK(1, warn, |
886 | "NA: someone advertises our address %pI6 on %s!\n", | |
887 | &ifp->addr, ifp->idev->dev->name); | |
1da177e4 LT |
888 | in6_ifa_put(ifp); |
889 | return; | |
890 | } | |
891 | neigh = neigh_lookup(&nd_tbl, &msg->target, dev); | |
892 | ||
893 | if (neigh) { | |
894 | u8 old_flags = neigh->flags; | |
53b7997f | 895 | struct net *net = dev_net(dev); |
1da177e4 LT |
896 | |
897 | if (neigh->nud_state & NUD_FAILED) | |
898 | goto out; | |
899 | ||
5f3e6e9e VN |
900 | /* |
901 | * Don't update the neighbor cache entry on a proxy NA from | |
902 | * ourselves because either the proxied node is off link or it | |
903 | * has already sent a NA to us. | |
904 | */ | |
905 | if (lladdr && !memcmp(lladdr, dev->dev_addr, dev->addr_len) && | |
53b7997f YH |
906 | net->ipv6.devconf_all->forwarding && net->ipv6.devconf_all->proxy_ndp && |
907 | pneigh_lookup(&nd_tbl, net, &msg->target, dev, 0)) { | |
b20b6d97 | 908 | /* XXX: idev->cnf.proxy_ndp */ |
5f3e6e9e | 909 | goto out; |
fbea49e1 | 910 | } |
5f3e6e9e | 911 | |
1da177e4 LT |
912 | neigh_update(neigh, lladdr, |
913 | msg->icmph.icmp6_solicited ? NUD_REACHABLE : NUD_STALE, | |
914 | NEIGH_UPDATE_F_WEAK_OVERRIDE| | |
915 | (msg->icmph.icmp6_override ? NEIGH_UPDATE_F_OVERRIDE : 0)| | |
916 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
917 | (msg->icmph.icmp6_router ? NEIGH_UPDATE_F_ISROUTER : 0)); | |
918 | ||
919 | if ((old_flags & ~neigh->flags) & NTF_ROUTER) { | |
920 | /* | |
921 | * Change: router to host | |
922 | */ | |
923 | struct rt6_info *rt; | |
924 | rt = rt6_get_dflt_router(saddr, dev); | |
925 | if (rt) | |
e0a1ad73 | 926 | ip6_del_rt(rt); |
1da177e4 LT |
927 | } |
928 | ||
929 | out: | |
930 | neigh_release(neigh); | |
931 | } | |
932 | } | |
933 | ||
934 | static void ndisc_recv_rs(struct sk_buff *skb) | |
935 | { | |
9c70220b | 936 | struct rs_msg *rs_msg = (struct rs_msg *)skb_transport_header(skb); |
1da177e4 LT |
937 | unsigned long ndoptlen = skb->len - sizeof(*rs_msg); |
938 | struct neighbour *neigh; | |
939 | struct inet6_dev *idev; | |
b71d1d42 | 940 | const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; |
1da177e4 LT |
941 | struct ndisc_options ndopts; |
942 | u8 *lladdr = NULL; | |
943 | ||
944 | if (skb->len < sizeof(*rs_msg)) | |
945 | return; | |
946 | ||
cfdf7647 | 947 | idev = __in6_dev_get(skb->dev); |
1da177e4 | 948 | if (!idev) { |
675418d5 | 949 | ND_PRINTK(1, err, "RS: can't find in6 device\n"); |
1da177e4 LT |
950 | return; |
951 | } | |
952 | ||
953 | /* Don't accept RS if we're not in router mode */ | |
954 | if (!idev->cnf.forwarding) | |
955 | goto out; | |
956 | ||
957 | /* | |
958 | * Don't update NCE if src = ::; | |
959 | * this implies that the source node has no ip address assigned yet. | |
960 | */ | |
961 | if (ipv6_addr_any(saddr)) | |
962 | goto out; | |
963 | ||
964 | /* Parse ND options */ | |
965 | if (!ndisc_parse_options(rs_msg->opt, ndoptlen, &ndopts)) { | |
675418d5 | 966 | ND_PRINTK(2, notice, "NS: invalid ND option, ignored\n"); |
1da177e4 LT |
967 | goto out; |
968 | } | |
969 | ||
970 | if (ndopts.nd_opts_src_lladdr) { | |
971 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, | |
972 | skb->dev); | |
973 | if (!lladdr) | |
974 | goto out; | |
975 | } | |
976 | ||
977 | neigh = __neigh_lookup(&nd_tbl, saddr, skb->dev, 1); | |
978 | if (neigh) { | |
979 | neigh_update(neigh, lladdr, NUD_STALE, | |
980 | NEIGH_UPDATE_F_WEAK_OVERRIDE| | |
981 | NEIGH_UPDATE_F_OVERRIDE| | |
982 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER); | |
983 | neigh_release(neigh); | |
984 | } | |
985 | out: | |
cfdf7647 | 986 | return; |
1da177e4 LT |
987 | } |
988 | ||
31910575 PY |
989 | static void ndisc_ra_useropt(struct sk_buff *ra, struct nd_opt_hdr *opt) |
990 | { | |
991 | struct icmp6hdr *icmp6h = (struct icmp6hdr *)skb_transport_header(ra); | |
992 | struct sk_buff *skb; | |
993 | struct nlmsghdr *nlh; | |
994 | struct nduseroptmsg *ndmsg; | |
c346dca1 | 995 | struct net *net = dev_net(ra->dev); |
31910575 PY |
996 | int err; |
997 | int base_size = NLMSG_ALIGN(sizeof(struct nduseroptmsg) | |
998 | + (opt->nd_opt_len << 3)); | |
999 | size_t msg_size = base_size + nla_total_size(sizeof(struct in6_addr)); | |
1000 | ||
1001 | skb = nlmsg_new(msg_size, GFP_ATOMIC); | |
1002 | if (skb == NULL) { | |
1003 | err = -ENOBUFS; | |
1004 | goto errout; | |
1005 | } | |
1006 | ||
1007 | nlh = nlmsg_put(skb, 0, 0, RTM_NEWNDUSEROPT, base_size, 0); | |
1008 | if (nlh == NULL) { | |
1009 | goto nla_put_failure; | |
1010 | } | |
1011 | ||
1012 | ndmsg = nlmsg_data(nlh); | |
1013 | ndmsg->nduseropt_family = AF_INET6; | |
dbb2ed24 | 1014 | ndmsg->nduseropt_ifindex = ra->dev->ifindex; |
31910575 PY |
1015 | ndmsg->nduseropt_icmp_type = icmp6h->icmp6_type; |
1016 | ndmsg->nduseropt_icmp_code = icmp6h->icmp6_code; | |
1017 | ndmsg->nduseropt_opts_len = opt->nd_opt_len << 3; | |
1018 | ||
1019 | memcpy(ndmsg + 1, opt, opt->nd_opt_len << 3); | |
1020 | ||
c78679e8 DM |
1021 | if (nla_put(skb, NDUSEROPT_SRCADDR, sizeof(struct in6_addr), |
1022 | &ipv6_hdr(ra)->saddr)) | |
1023 | goto nla_put_failure; | |
31910575 PY |
1024 | nlmsg_end(skb, nlh); |
1025 | ||
1ce85fe4 | 1026 | rtnl_notify(skb, net, 0, RTNLGRP_ND_USEROPT, NULL, GFP_ATOMIC); |
31910575 PY |
1027 | return; |
1028 | ||
1029 | nla_put_failure: | |
1030 | nlmsg_free(skb); | |
1031 | err = -EMSGSIZE; | |
1032 | errout: | |
a18bc695 | 1033 | rtnl_set_sk_err(net, RTNLGRP_ND_USEROPT, err); |
31910575 PY |
1034 | } |
1035 | ||
65e9b62d TG |
1036 | static inline int accept_ra(struct inet6_dev *in6_dev) |
1037 | { | |
1038 | /* | |
1039 | * If forwarding is enabled, RA are not accepted unless the special | |
1040 | * hybrid mode (accept_ra=2) is enabled. | |
1041 | */ | |
1042 | if (in6_dev->cnf.forwarding && in6_dev->cnf.accept_ra < 2) | |
1043 | return 0; | |
1044 | ||
1045 | return in6_dev->cnf.accept_ra; | |
1046 | } | |
1047 | ||
1da177e4 LT |
1048 | static void ndisc_router_discovery(struct sk_buff *skb) |
1049 | { | |
9c70220b | 1050 | struct ra_msg *ra_msg = (struct ra_msg *)skb_transport_header(skb); |
1da177e4 LT |
1051 | struct neighbour *neigh = NULL; |
1052 | struct inet6_dev *in6_dev; | |
65f5c7c1 | 1053 | struct rt6_info *rt = NULL; |
1da177e4 LT |
1054 | int lifetime; |
1055 | struct ndisc_options ndopts; | |
1056 | int optlen; | |
ebacaaa0 | 1057 | unsigned int pref = 0; |
1da177e4 LT |
1058 | |
1059 | __u8 * opt = (__u8 *)(ra_msg + 1); | |
1060 | ||
27a884dc | 1061 | optlen = (skb->tail - skb->transport_header) - sizeof(struct ra_msg); |
1da177e4 | 1062 | |
0660e03f | 1063 | if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) { |
675418d5 | 1064 | ND_PRINTK(2, warn, "RA: source address is not link-local\n"); |
1da177e4 LT |
1065 | return; |
1066 | } | |
1067 | if (optlen < 0) { | |
675418d5 | 1068 | ND_PRINTK(2, warn, "RA: packet too short\n"); |
1da177e4 LT |
1069 | return; |
1070 | } | |
1071 | ||
de357cc0 | 1072 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 | 1073 | if (skb->ndisc_nodetype == NDISC_NODETYPE_HOST) { |
675418d5 | 1074 | ND_PRINTK(2, warn, "RA: from host or unauthorized router\n"); |
fadf6bf0 TF |
1075 | return; |
1076 | } | |
de357cc0 | 1077 | #endif |
fadf6bf0 | 1078 | |
1da177e4 LT |
1079 | /* |
1080 | * set the RA_RECV flag in the interface | |
1081 | */ | |
1082 | ||
cfdf7647 | 1083 | in6_dev = __in6_dev_get(skb->dev); |
1da177e4 | 1084 | if (in6_dev == NULL) { |
675418d5 JP |
1085 | ND_PRINTK(0, err, "RA: can't find inet6 device for %s\n", |
1086 | skb->dev->name); | |
1da177e4 LT |
1087 | return; |
1088 | } | |
1da177e4 LT |
1089 | |
1090 | if (!ndisc_parse_options(opt, optlen, &ndopts)) { | |
675418d5 | 1091 | ND_PRINTK(2, warn, "RA: invalid ND options\n"); |
1da177e4 LT |
1092 | return; |
1093 | } | |
1094 | ||
65e9b62d | 1095 | if (!accept_ra(in6_dev)) |
31ce8c71 DW |
1096 | goto skip_linkparms; |
1097 | ||
de357cc0 | 1098 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 TF |
1099 | /* skip link-specific parameters from interior routers */ |
1100 | if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT) | |
1101 | goto skip_linkparms; | |
de357cc0 | 1102 | #endif |
fadf6bf0 | 1103 | |
1da177e4 LT |
1104 | if (in6_dev->if_flags & IF_RS_SENT) { |
1105 | /* | |
1106 | * flag that an RA was received after an RS was sent | |
1107 | * out on this interface. | |
1108 | */ | |
1109 | in6_dev->if_flags |= IF_RA_RCVD; | |
1110 | } | |
1111 | ||
1112 | /* | |
1113 | * Remember the managed/otherconf flags from most recently | |
1114 | * received RA message (RFC 2462) -- yoshfuji | |
1115 | */ | |
1116 | in6_dev->if_flags = (in6_dev->if_flags & ~(IF_RA_MANAGED | | |
1117 | IF_RA_OTHERCONF)) | | |
1118 | (ra_msg->icmph.icmp6_addrconf_managed ? | |
1119 | IF_RA_MANAGED : 0) | | |
1120 | (ra_msg->icmph.icmp6_addrconf_other ? | |
1121 | IF_RA_OTHERCONF : 0); | |
1122 | ||
65f5c7c1 YH |
1123 | if (!in6_dev->cnf.accept_ra_defrtr) |
1124 | goto skip_defrtr; | |
1125 | ||
9f56220f AH |
1126 | if (ipv6_chk_addr(dev_net(in6_dev->dev), &ipv6_hdr(skb)->saddr, NULL, 0)) |
1127 | goto skip_defrtr; | |
1128 | ||
1da177e4 LT |
1129 | lifetime = ntohs(ra_msg->icmph.icmp6_rt_lifetime); |
1130 | ||
ebacaaa0 YH |
1131 | #ifdef CONFIG_IPV6_ROUTER_PREF |
1132 | pref = ra_msg->icmph.icmp6_router_pref; | |
1133 | /* 10b is handled as if it were 00b (medium) */ | |
930d6ff2 | 1134 | if (pref == ICMPV6_ROUTER_PREF_INVALID || |
6d5b78cd | 1135 | !in6_dev->cnf.accept_ra_rtr_pref) |
ebacaaa0 YH |
1136 | pref = ICMPV6_ROUTER_PREF_MEDIUM; |
1137 | #endif | |
1138 | ||
0660e03f | 1139 | rt = rt6_get_dflt_router(&ipv6_hdr(skb)->saddr, skb->dev); |
1da177e4 | 1140 | |
eb857186 DM |
1141 | if (rt) { |
1142 | neigh = dst_neigh_lookup(&rt->dst, &ipv6_hdr(skb)->saddr); | |
1143 | if (!neigh) { | |
675418d5 JP |
1144 | ND_PRINTK(0, err, |
1145 | "RA: %s got default router without neighbour\n", | |
1146 | __func__); | |
94e187c0 | 1147 | ip6_rt_put(rt); |
eb857186 DM |
1148 | return; |
1149 | } | |
1150 | } | |
1da177e4 | 1151 | if (rt && lifetime == 0) { |
e0a1ad73 | 1152 | ip6_del_rt(rt); |
1da177e4 LT |
1153 | rt = NULL; |
1154 | } | |
1155 | ||
1156 | if (rt == NULL && lifetime) { | |
675418d5 | 1157 | ND_PRINTK(3, dbg, "RA: adding default router\n"); |
1da177e4 | 1158 | |
0660e03f | 1159 | rt = rt6_add_dflt_router(&ipv6_hdr(skb)->saddr, skb->dev, pref); |
1da177e4 | 1160 | if (rt == NULL) { |
675418d5 JP |
1161 | ND_PRINTK(0, err, |
1162 | "RA: %s failed to add default route\n", | |
1163 | __func__); | |
1da177e4 LT |
1164 | return; |
1165 | } | |
1166 | ||
eb857186 | 1167 | neigh = dst_neigh_lookup(&rt->dst, &ipv6_hdr(skb)->saddr); |
1da177e4 | 1168 | if (neigh == NULL) { |
675418d5 JP |
1169 | ND_PRINTK(0, err, |
1170 | "RA: %s got default router without neighbour\n", | |
1171 | __func__); | |
94e187c0 | 1172 | ip6_rt_put(rt); |
1da177e4 LT |
1173 | return; |
1174 | } | |
1175 | neigh->flags |= NTF_ROUTER; | |
ebacaaa0 | 1176 | } else if (rt) { |
22441cfa | 1177 | rt->rt6i_flags = (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); |
1da177e4 LT |
1178 | } |
1179 | ||
1180 | if (rt) | |
1716a961 | 1181 | rt6_set_expires(rt, jiffies + (HZ * lifetime)); |
1da177e4 LT |
1182 | if (ra_msg->icmph.icmp6_hop_limit) { |
1183 | in6_dev->cnf.hop_limit = ra_msg->icmph.icmp6_hop_limit; | |
1184 | if (rt) | |
defb3519 DM |
1185 | dst_metric_set(&rt->dst, RTAX_HOPLIMIT, |
1186 | ra_msg->icmph.icmp6_hop_limit); | |
1da177e4 LT |
1187 | } |
1188 | ||
65f5c7c1 YH |
1189 | skip_defrtr: |
1190 | ||
1da177e4 LT |
1191 | /* |
1192 | * Update Reachable Time and Retrans Timer | |
1193 | */ | |
1194 | ||
1195 | if (in6_dev->nd_parms) { | |
1196 | unsigned long rtime = ntohl(ra_msg->retrans_timer); | |
1197 | ||
1198 | if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/HZ) { | |
1199 | rtime = (rtime*HZ)/1000; | |
1200 | if (rtime < HZ/10) | |
1201 | rtime = HZ/10; | |
1202 | in6_dev->nd_parms->retrans_time = rtime; | |
1203 | in6_dev->tstamp = jiffies; | |
1204 | inet6_ifinfo_notify(RTM_NEWLINK, in6_dev); | |
1205 | } | |
1206 | ||
1207 | rtime = ntohl(ra_msg->reachable_time); | |
1208 | if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/(3*HZ)) { | |
1209 | rtime = (rtime*HZ)/1000; | |
1210 | ||
1211 | if (rtime < HZ/10) | |
1212 | rtime = HZ/10; | |
1213 | ||
1214 | if (rtime != in6_dev->nd_parms->base_reachable_time) { | |
1215 | in6_dev->nd_parms->base_reachable_time = rtime; | |
1216 | in6_dev->nd_parms->gc_staletime = 3 * rtime; | |
1217 | in6_dev->nd_parms->reachable_time = neigh_rand_reach_time(rtime); | |
1218 | in6_dev->tstamp = jiffies; | |
1219 | inet6_ifinfo_notify(RTM_NEWLINK, in6_dev); | |
1220 | } | |
1221 | } | |
1222 | } | |
1223 | ||
fadf6bf0 TF |
1224 | skip_linkparms: |
1225 | ||
1da177e4 LT |
1226 | /* |
1227 | * Process options. | |
1228 | */ | |
1229 | ||
1230 | if (!neigh) | |
0660e03f | 1231 | neigh = __neigh_lookup(&nd_tbl, &ipv6_hdr(skb)->saddr, |
1da177e4 LT |
1232 | skb->dev, 1); |
1233 | if (neigh) { | |
1234 | u8 *lladdr = NULL; | |
1235 | if (ndopts.nd_opts_src_lladdr) { | |
1236 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, | |
1237 | skb->dev); | |
1238 | if (!lladdr) { | |
675418d5 JP |
1239 | ND_PRINTK(2, warn, |
1240 | "RA: invalid link-layer address length\n"); | |
1da177e4 LT |
1241 | goto out; |
1242 | } | |
1243 | } | |
1244 | neigh_update(neigh, lladdr, NUD_STALE, | |
1245 | NEIGH_UPDATE_F_WEAK_OVERRIDE| | |
1246 | NEIGH_UPDATE_F_OVERRIDE| | |
1247 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
1248 | NEIGH_UPDATE_F_ISROUTER); | |
1249 | } | |
1250 | ||
65e9b62d | 1251 | if (!accept_ra(in6_dev)) |
31ce8c71 DW |
1252 | goto out; |
1253 | ||
70ceb4f5 | 1254 | #ifdef CONFIG_IPV6_ROUTE_INFO |
9f56220f AH |
1255 | if (ipv6_chk_addr(dev_net(in6_dev->dev), &ipv6_hdr(skb)->saddr, NULL, 0)) |
1256 | goto skip_routeinfo; | |
1257 | ||
09c884d4 | 1258 | if (in6_dev->cnf.accept_ra_rtr_pref && ndopts.nd_opts_ri) { |
70ceb4f5 YH |
1259 | struct nd_opt_hdr *p; |
1260 | for (p = ndopts.nd_opts_ri; | |
1261 | p; | |
1262 | p = ndisc_next_option(p, ndopts.nd_opts_ri_end)) { | |
6294e000 YH |
1263 | struct route_info *ri = (struct route_info *)p; |
1264 | #ifdef CONFIG_IPV6_NDISC_NODETYPE | |
1265 | if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT && | |
1266 | ri->prefix_len == 0) | |
1267 | continue; | |
1268 | #endif | |
1269 | if (ri->prefix_len > in6_dev->cnf.accept_ra_rt_info_max_plen) | |
09c884d4 | 1270 | continue; |
70ceb4f5 | 1271 | rt6_route_rcv(skb->dev, (u8*)p, (p->nd_opt_len) << 3, |
0660e03f | 1272 | &ipv6_hdr(skb)->saddr); |
70ceb4f5 YH |
1273 | } |
1274 | } | |
9f56220f AH |
1275 | |
1276 | skip_routeinfo: | |
70ceb4f5 YH |
1277 | #endif |
1278 | ||
de357cc0 | 1279 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 TF |
1280 | /* skip link-specific ndopts from interior routers */ |
1281 | if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT) | |
1282 | goto out; | |
de357cc0 | 1283 | #endif |
fadf6bf0 | 1284 | |
c4fd30eb | 1285 | if (in6_dev->cnf.accept_ra_pinfo && ndopts.nd_opts_pi) { |
1da177e4 LT |
1286 | struct nd_opt_hdr *p; |
1287 | for (p = ndopts.nd_opts_pi; | |
1288 | p; | |
1289 | p = ndisc_next_option(p, ndopts.nd_opts_pi_end)) { | |
e6bff995 NH |
1290 | addrconf_prefix_rcv(skb->dev, (u8 *)p, |
1291 | (p->nd_opt_len) << 3, | |
1292 | ndopts.nd_opts_src_lladdr != NULL); | |
1da177e4 LT |
1293 | } |
1294 | } | |
1295 | ||
1296 | if (ndopts.nd_opts_mtu) { | |
e69a4adc | 1297 | __be32 n; |
1da177e4 LT |
1298 | u32 mtu; |
1299 | ||
e69a4adc AV |
1300 | memcpy(&n, ((u8*)(ndopts.nd_opts_mtu+1))+2, sizeof(mtu)); |
1301 | mtu = ntohl(n); | |
1da177e4 LT |
1302 | |
1303 | if (mtu < IPV6_MIN_MTU || mtu > skb->dev->mtu) { | |
675418d5 | 1304 | ND_PRINTK(2, warn, "RA: invalid mtu: %d\n", mtu); |
1da177e4 LT |
1305 | } else if (in6_dev->cnf.mtu6 != mtu) { |
1306 | in6_dev->cnf.mtu6 = mtu; | |
1307 | ||
1308 | if (rt) | |
defb3519 | 1309 | dst_metric_set(&rt->dst, RTAX_MTU, mtu); |
1da177e4 LT |
1310 | |
1311 | rt6_mtu_change(skb->dev, mtu); | |
1312 | } | |
1313 | } | |
1ab1457c | 1314 | |
31910575 | 1315 | if (ndopts.nd_useropts) { |
61cf46ad YH |
1316 | struct nd_opt_hdr *p; |
1317 | for (p = ndopts.nd_useropts; | |
1318 | p; | |
1319 | p = ndisc_next_useropt(p, ndopts.nd_useropts_end)) { | |
1320 | ndisc_ra_useropt(skb, p); | |
31910575 PY |
1321 | } |
1322 | } | |
1323 | ||
1da177e4 | 1324 | if (ndopts.nd_opts_tgt_lladdr || ndopts.nd_opts_rh) { |
675418d5 | 1325 | ND_PRINTK(2, warn, "RA: invalid RA options\n"); |
1da177e4 LT |
1326 | } |
1327 | out: | |
94e187c0 | 1328 | ip6_rt_put(rt); |
eb857186 | 1329 | if (neigh) |
1da177e4 | 1330 | neigh_release(neigh); |
1da177e4 LT |
1331 | } |
1332 | ||
1333 | static void ndisc_redirect_rcv(struct sk_buff *skb) | |
1334 | { | |
de357cc0 | 1335 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 TF |
1336 | switch (skb->ndisc_nodetype) { |
1337 | case NDISC_NODETYPE_HOST: | |
1338 | case NDISC_NODETYPE_NODEFAULT: | |
675418d5 JP |
1339 | ND_PRINTK(2, warn, |
1340 | "Redirect: from host or unauthorized router\n"); | |
fadf6bf0 TF |
1341 | return; |
1342 | } | |
de357cc0 | 1343 | #endif |
fadf6bf0 | 1344 | |
0660e03f | 1345 | if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) { |
675418d5 JP |
1346 | ND_PRINTK(2, warn, |
1347 | "Redirect: source address is not link-local\n"); | |
1da177e4 LT |
1348 | return; |
1349 | } | |
1350 | ||
b94f1c09 | 1351 | icmpv6_notify(skb, NDISC_REDIRECT, 0, 0); |
1da177e4 LT |
1352 | } |
1353 | ||
4991969a | 1354 | void ndisc_send_redirect(struct sk_buff *skb, const struct in6_addr *target) |
1da177e4 | 1355 | { |
1762f7e8 | 1356 | struct net_device *dev = skb->dev; |
c346dca1 | 1357 | struct net *net = dev_net(dev); |
1762f7e8 | 1358 | struct sock *sk = net->ipv6.ndisc_sk; |
1da177e4 | 1359 | int len = sizeof(struct icmp6hdr) + 2 * sizeof(struct in6_addr); |
fbfe95a4 | 1360 | struct inet_peer *peer; |
1da177e4 LT |
1361 | struct sk_buff *buff; |
1362 | struct icmp6hdr *icmph; | |
1363 | struct in6_addr saddr_buf; | |
1364 | struct in6_addr *addrp; | |
1da177e4 LT |
1365 | struct rt6_info *rt; |
1366 | struct dst_entry *dst; | |
1367 | struct inet6_dev *idev; | |
4c9483b2 | 1368 | struct flowi6 fl6; |
1da177e4 | 1369 | u8 *opt; |
a7ae1992 | 1370 | int hlen, tlen; |
1da177e4 LT |
1371 | int rd_len; |
1372 | int err; | |
1da177e4 | 1373 | u8 ha_buf[MAX_ADDR_LEN], *ha = NULL; |
1d861aa4 | 1374 | bool ret; |
1da177e4 | 1375 | |
95c385b4 | 1376 | if (ipv6_get_lladdr(dev, &saddr_buf, IFA_F_TENTATIVE)) { |
675418d5 JP |
1377 | ND_PRINTK(2, warn, "Redirect: no link-local address on %s\n", |
1378 | dev->name); | |
1ab1457c YH |
1379 | return; |
1380 | } | |
1da177e4 | 1381 | |
0660e03f | 1382 | if (!ipv6_addr_equal(&ipv6_hdr(skb)->daddr, target) && |
bf0b48df | 1383 | ipv6_addr_type(target) != (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) { |
675418d5 JP |
1384 | ND_PRINTK(2, warn, |
1385 | "Redirect: target address is not link-local unicast\n"); | |
29556526 LY |
1386 | return; |
1387 | } | |
1388 | ||
4c9483b2 | 1389 | icmpv6_flow_init(sk, &fl6, NDISC_REDIRECT, |
95e41e93 | 1390 | &saddr_buf, &ipv6_hdr(skb)->saddr, dev->ifindex); |
1da177e4 | 1391 | |
4c9483b2 | 1392 | dst = ip6_route_output(net, NULL, &fl6); |
5095d64d RL |
1393 | if (dst->error) { |
1394 | dst_release(dst); | |
1da177e4 | 1395 | return; |
5095d64d | 1396 | } |
4c9483b2 | 1397 | dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), NULL, 0); |
452edd59 | 1398 | if (IS_ERR(dst)) |
1da177e4 | 1399 | return; |
1da177e4 LT |
1400 | |
1401 | rt = (struct rt6_info *) dst; | |
1402 | ||
1403 | if (rt->rt6i_flags & RTF_GATEWAY) { | |
675418d5 JP |
1404 | ND_PRINTK(2, warn, |
1405 | "Redirect: destination is not a neighbour\n"); | |
d73f0801 | 1406 | goto release; |
1da177e4 | 1407 | } |
1d861aa4 DM |
1408 | peer = inet_getpeer_v6(net->ipv6.peers, &rt->rt6i_dst.addr, 1); |
1409 | ret = inet_peer_xrlim_allow(peer, 1*HZ); | |
1410 | if (peer) | |
1411 | inet_putpeer(peer); | |
1412 | if (!ret) | |
d73f0801 | 1413 | goto release; |
1da177e4 LT |
1414 | |
1415 | if (dev->addr_len) { | |
4991969a DM |
1416 | struct neighbour *neigh = dst_neigh_lookup(skb_dst(skb), target); |
1417 | if (!neigh) { | |
675418d5 JP |
1418 | ND_PRINTK(2, warn, |
1419 | "Redirect: no neigh for target address\n"); | |
4991969a DM |
1420 | goto release; |
1421 | } | |
1422 | ||
1da177e4 LT |
1423 | read_lock_bh(&neigh->lock); |
1424 | if (neigh->nud_state & NUD_VALID) { | |
1425 | memcpy(ha_buf, neigh->ha, dev->addr_len); | |
1426 | read_unlock_bh(&neigh->lock); | |
1427 | ha = ha_buf; | |
1428 | len += ndisc_opt_addr_space(dev); | |
1429 | } else | |
1430 | read_unlock_bh(&neigh->lock); | |
4991969a DM |
1431 | |
1432 | neigh_release(neigh); | |
1da177e4 LT |
1433 | } |
1434 | ||
1435 | rd_len = min_t(unsigned int, | |
1436 | IPV6_MIN_MTU-sizeof(struct ipv6hdr)-len, skb->len + 8); | |
1437 | rd_len &= ~0x7; | |
1438 | len += rd_len; | |
1439 | ||
a7ae1992 HX |
1440 | hlen = LL_RESERVED_SPACE(dev); |
1441 | tlen = dev->needed_tailroom; | |
d54a81d3 DM |
1442 | buff = sock_alloc_send_skb(sk, |
1443 | (MAX_HEADER + sizeof(struct ipv6hdr) + | |
a7ae1992 | 1444 | len + hlen + tlen), |
1da177e4 LT |
1445 | 1, &err); |
1446 | if (buff == NULL) { | |
675418d5 JP |
1447 | ND_PRINTK(0, err, |
1448 | "Redirect: %s failed to allocate an skb, err=%d\n", | |
1449 | __func__, err); | |
d73f0801 | 1450 | goto release; |
1da177e4 LT |
1451 | } |
1452 | ||
a7ae1992 | 1453 | skb_reserve(buff, hlen); |
0660e03f | 1454 | ip6_nd_hdr(sk, buff, dev, &saddr_buf, &ipv6_hdr(skb)->saddr, |
1da177e4 LT |
1455 | IPPROTO_ICMPV6, len); |
1456 | ||
27a884dc | 1457 | skb_set_transport_header(buff, skb_tail_pointer(buff) - buff->data); |
d10ba34b ACM |
1458 | skb_put(buff, len); |
1459 | icmph = icmp6_hdr(buff); | |
1da177e4 LT |
1460 | |
1461 | memset(icmph, 0, sizeof(struct icmp6hdr)); | |
1462 | icmph->icmp6_type = NDISC_REDIRECT; | |
1463 | ||
1464 | /* | |
1465 | * copy target and destination addresses | |
1466 | */ | |
1467 | ||
1468 | addrp = (struct in6_addr *)(icmph + 1); | |
4e3fd7a0 | 1469 | *addrp = *target; |
1da177e4 | 1470 | addrp++; |
4e3fd7a0 | 1471 | *addrp = ipv6_hdr(skb)->daddr; |
1da177e4 LT |
1472 | |
1473 | opt = (u8*) (addrp + 1); | |
1474 | ||
1475 | /* | |
1476 | * include target_address option | |
1477 | */ | |
1478 | ||
1479 | if (ha) | |
1480 | opt = ndisc_fill_addr_option(opt, ND_OPT_TARGET_LL_ADDR, ha, | |
1481 | dev->addr_len, dev->type); | |
1482 | ||
1483 | /* | |
1484 | * build redirect option and copy skb over to the new packet. | |
1485 | */ | |
1486 | ||
1ab1457c | 1487 | memset(opt, 0, 8); |
1da177e4 LT |
1488 | *(opt++) = ND_OPT_REDIRECT_HDR; |
1489 | *(opt++) = (rd_len >> 3); | |
1490 | opt += 6; | |
1491 | ||
0660e03f | 1492 | memcpy(opt, ipv6_hdr(skb), rd_len - 8); |
1da177e4 | 1493 | |
0660e03f | 1494 | icmph->icmp6_cksum = csum_ipv6_magic(&saddr_buf, &ipv6_hdr(skb)->saddr, |
1da177e4 | 1495 | len, IPPROTO_ICMPV6, |
07f0757a | 1496 | csum_partial(icmph, len, 0)); |
1da177e4 | 1497 | |
adf30907 | 1498 | skb_dst_set(buff, dst); |
cfdf7647 ED |
1499 | rcu_read_lock(); |
1500 | idev = __in6_dev_get(dst->dev); | |
edf391ff | 1501 | IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len); |
b2e0b385 | 1502 | err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, buff, NULL, dst->dev, |
6e23ae2a | 1503 | dst_output); |
1da177e4 | 1504 | if (!err) { |
5c5d244b | 1505 | ICMP6MSGOUT_INC_STATS(net, idev, NDISC_REDIRECT); |
a862f6a6 | 1506 | ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); |
1da177e4 LT |
1507 | } |
1508 | ||
cfdf7647 | 1509 | rcu_read_unlock(); |
d73f0801 IJ |
1510 | return; |
1511 | ||
1512 | release: | |
1513 | dst_release(dst); | |
1da177e4 LT |
1514 | } |
1515 | ||
1516 | static void pndisc_redo(struct sk_buff *skb) | |
1517 | { | |
140e26fc | 1518 | ndisc_recv_ns(skb); |
1da177e4 LT |
1519 | kfree_skb(skb); |
1520 | } | |
1521 | ||
1522 | int ndisc_rcv(struct sk_buff *skb) | |
1523 | { | |
1524 | struct nd_msg *msg; | |
1525 | ||
1526 | if (!pskb_may_pull(skb, skb->len)) | |
1527 | return 0; | |
1528 | ||
9c70220b | 1529 | msg = (struct nd_msg *)skb_transport_header(skb); |
1da177e4 | 1530 | |
9c70220b | 1531 | __skb_push(skb, skb->data - skb_transport_header(skb)); |
1da177e4 | 1532 | |
0660e03f | 1533 | if (ipv6_hdr(skb)->hop_limit != 255) { |
675418d5 JP |
1534 | ND_PRINTK(2, warn, "NDISC: invalid hop-limit: %d\n", |
1535 | ipv6_hdr(skb)->hop_limit); | |
1da177e4 LT |
1536 | return 0; |
1537 | } | |
1538 | ||
1539 | if (msg->icmph.icmp6_code != 0) { | |
675418d5 JP |
1540 | ND_PRINTK(2, warn, "NDISC: invalid ICMPv6 code: %d\n", |
1541 | msg->icmph.icmp6_code); | |
1da177e4 LT |
1542 | return 0; |
1543 | } | |
1544 | ||
a61bbcf2 PM |
1545 | memset(NEIGH_CB(skb), 0, sizeof(struct neighbour_cb)); |
1546 | ||
1da177e4 LT |
1547 | switch (msg->icmph.icmp6_type) { |
1548 | case NDISC_NEIGHBOUR_SOLICITATION: | |
1549 | ndisc_recv_ns(skb); | |
1550 | break; | |
1551 | ||
1552 | case NDISC_NEIGHBOUR_ADVERTISEMENT: | |
1553 | ndisc_recv_na(skb); | |
1554 | break; | |
1555 | ||
1556 | case NDISC_ROUTER_SOLICITATION: | |
1557 | ndisc_recv_rs(skb); | |
1558 | break; | |
1559 | ||
1560 | case NDISC_ROUTER_ADVERTISEMENT: | |
1561 | ndisc_router_discovery(skb); | |
1562 | break; | |
1563 | ||
1564 | case NDISC_REDIRECT: | |
1565 | ndisc_redirect_rcv(skb); | |
1566 | break; | |
3ff50b79 | 1567 | } |
1da177e4 LT |
1568 | |
1569 | return 0; | |
1570 | } | |
1571 | ||
1572 | static int ndisc_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1573 | { | |
1574 | struct net_device *dev = ptr; | |
c346dca1 | 1575 | struct net *net = dev_net(dev); |
1da177e4 LT |
1576 | |
1577 | switch (event) { | |
1578 | case NETDEV_CHANGEADDR: | |
1579 | neigh_changeaddr(&nd_tbl, dev); | |
5b7c931d | 1580 | fib6_run_gc(~0UL, net); |
1da177e4 LT |
1581 | break; |
1582 | case NETDEV_DOWN: | |
1583 | neigh_ifdown(&nd_tbl, dev); | |
5b7c931d | 1584 | fib6_run_gc(~0UL, net); |
1da177e4 | 1585 | break; |
f47b9464 BH |
1586 | case NETDEV_NOTIFY_PEERS: |
1587 | ndisc_send_unsol_na(dev); | |
1588 | break; | |
1da177e4 LT |
1589 | default: |
1590 | break; | |
1591 | } | |
1592 | ||
1593 | return NOTIFY_DONE; | |
1594 | } | |
1595 | ||
1596 | static struct notifier_block ndisc_netdev_notifier = { | |
1597 | .notifier_call = ndisc_netdev_event, | |
1598 | }; | |
1599 | ||
1600 | #ifdef CONFIG_SYSCTL | |
1601 | static void ndisc_warn_deprecated_sysctl(struct ctl_table *ctl, | |
1602 | const char *func, const char *dev_name) | |
1603 | { | |
1604 | static char warncomm[TASK_COMM_LEN]; | |
1605 | static int warned; | |
1606 | if (strcmp(warncomm, current->comm) && warned < 5) { | |
1607 | strcpy(warncomm, current->comm); | |
f3213831 | 1608 | 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 |
1609 | warncomm, func, |
1610 | dev_name, ctl->procname, | |
1611 | dev_name, ctl->procname); | |
1612 | warned++; | |
1613 | } | |
1614 | } | |
1615 | ||
8d65af78 | 1616 | int ndisc_ifinfo_sysctl_change(struct ctl_table *ctl, int write, void __user *buffer, size_t *lenp, loff_t *ppos) |
1da177e4 LT |
1617 | { |
1618 | struct net_device *dev = ctl->extra1; | |
1619 | struct inet6_dev *idev; | |
1620 | int ret; | |
1621 | ||
d12af679 EB |
1622 | if ((strcmp(ctl->procname, "retrans_time") == 0) || |
1623 | (strcmp(ctl->procname, "base_reachable_time") == 0)) | |
1da177e4 LT |
1624 | ndisc_warn_deprecated_sysctl(ctl, "syscall", dev ? dev->name : "default"); |
1625 | ||
d12af679 | 1626 | if (strcmp(ctl->procname, "retrans_time") == 0) |
8d65af78 | 1627 | ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
d12af679 EB |
1628 | |
1629 | else if (strcmp(ctl->procname, "base_reachable_time") == 0) | |
1da177e4 | 1630 | ret = proc_dointvec_jiffies(ctl, write, |
8d65af78 | 1631 | buffer, lenp, ppos); |
d12af679 EB |
1632 | |
1633 | else if ((strcmp(ctl->procname, "retrans_time_ms") == 0) || | |
ad02ac14 | 1634 | (strcmp(ctl->procname, "base_reachable_time_ms") == 0)) |
1da177e4 | 1635 | ret = proc_dointvec_ms_jiffies(ctl, write, |
8d65af78 | 1636 | buffer, lenp, ppos); |
d12af679 | 1637 | else |
1da177e4 | 1638 | ret = -1; |
1da177e4 LT |
1639 | |
1640 | if (write && ret == 0 && dev && (idev = in6_dev_get(dev)) != NULL) { | |
d12af679 | 1641 | if (ctl->data == &idev->nd_parms->base_reachable_time) |
1da177e4 LT |
1642 | idev->nd_parms->reachable_time = neigh_rand_reach_time(idev->nd_parms->base_reachable_time); |
1643 | idev->tstamp = jiffies; | |
1644 | inet6_ifinfo_notify(RTM_NEWLINK, idev); | |
1645 | in6_dev_put(idev); | |
1646 | } | |
1647 | return ret; | |
1648 | } | |
1649 | ||
1da177e4 LT |
1650 | |
1651 | #endif | |
1652 | ||
2c8c1e72 | 1653 | static int __net_init ndisc_net_init(struct net *net) |
1da177e4 LT |
1654 | { |
1655 | struct ipv6_pinfo *np; | |
1656 | struct sock *sk; | |
1ab1457c | 1657 | int err; |
1da177e4 | 1658 | |
1ed8516f DL |
1659 | err = inet_ctl_sock_create(&sk, PF_INET6, |
1660 | SOCK_RAW, IPPROTO_ICMPV6, net); | |
1da177e4 | 1661 | if (err < 0) { |
675418d5 JP |
1662 | ND_PRINTK(0, err, |
1663 | "NDISC: Failed to initialize the control socket (err %d)\n", | |
1664 | err); | |
1da177e4 LT |
1665 | return err; |
1666 | } | |
1667 | ||
1ed8516f | 1668 | net->ipv6.ndisc_sk = sk; |
1762f7e8 | 1669 | |
1da177e4 | 1670 | np = inet6_sk(sk); |
1da177e4 LT |
1671 | np->hop_limit = 255; |
1672 | /* Do not loopback ndisc messages */ | |
1673 | np->mc_loop = 0; | |
1da177e4 | 1674 | |
1762f7e8 DL |
1675 | return 0; |
1676 | } | |
1677 | ||
2c8c1e72 | 1678 | static void __net_exit ndisc_net_exit(struct net *net) |
1762f7e8 | 1679 | { |
1ed8516f | 1680 | inet_ctl_sock_destroy(net->ipv6.ndisc_sk); |
1762f7e8 DL |
1681 | } |
1682 | ||
1683 | static struct pernet_operations ndisc_net_ops = { | |
1684 | .init = ndisc_net_init, | |
1685 | .exit = ndisc_net_exit, | |
1686 | }; | |
1687 | ||
1688 | int __init ndisc_init(void) | |
1689 | { | |
1690 | int err; | |
1691 | ||
1692 | err = register_pernet_subsys(&ndisc_net_ops); | |
1693 | if (err) | |
1694 | return err; | |
1ab1457c YH |
1695 | /* |
1696 | * Initialize the neighbour table | |
1697 | */ | |
1da177e4 LT |
1698 | neigh_table_init(&nd_tbl); |
1699 | ||
1700 | #ifdef CONFIG_SYSCTL | |
54716e3b | 1701 | err = neigh_sysctl_register(NULL, &nd_tbl.parms, "ipv6", |
f8572d8f | 1702 | &ndisc_ifinfo_sysctl_change); |
1762f7e8 DL |
1703 | if (err) |
1704 | goto out_unregister_pernet; | |
1da177e4 | 1705 | #endif |
1762f7e8 DL |
1706 | err = register_netdevice_notifier(&ndisc_netdev_notifier); |
1707 | if (err) | |
1708 | goto out_unregister_sysctl; | |
1709 | out: | |
1710 | return err; | |
1da177e4 | 1711 | |
1762f7e8 DL |
1712 | out_unregister_sysctl: |
1713 | #ifdef CONFIG_SYSCTL | |
1714 | neigh_sysctl_unregister(&nd_tbl.parms); | |
1715 | out_unregister_pernet: | |
1716 | #endif | |
1717 | unregister_pernet_subsys(&ndisc_net_ops); | |
1718 | goto out; | |
1da177e4 LT |
1719 | } |
1720 | ||
1721 | void ndisc_cleanup(void) | |
1722 | { | |
36f73d0c | 1723 | unregister_netdevice_notifier(&ndisc_netdev_notifier); |
1da177e4 LT |
1724 | #ifdef CONFIG_SYSCTL |
1725 | neigh_sysctl_unregister(&nd_tbl.parms); | |
1726 | #endif | |
1727 | neigh_table_clear(&nd_tbl); | |
1762f7e8 | 1728 | unregister_pernet_subsys(&ndisc_net_ops); |
1da177e4 | 1729 | } |