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 | ||
315ff09d YH |
146 | static u8 *ndisc_fill_addr_option(u8 *opt, int type, void *data, |
147 | struct net_device *dev) | |
1da177e4 | 148 | { |
315ff09d YH |
149 | int pad = ndisc_addr_option_pad(dev->type); |
150 | int data_len = dev->addr_len; | |
c558e9fc | 151 | int space = ndisc_opt_addr_space(dev); |
1da177e4 LT |
152 | |
153 | opt[0] = type; | |
154 | opt[1] = space>>3; | |
155 | ||
156 | memset(opt + 2, 0, pad); | |
157 | opt += pad; | |
158 | space -= pad; | |
159 | ||
160 | memcpy(opt+2, data, data_len); | |
161 | data_len += 2; | |
162 | opt += data_len; | |
163 | if ((space -= data_len) > 0) | |
164 | memset(opt, 0, space); | |
165 | return opt + space; | |
166 | } | |
167 | ||
168 | static struct nd_opt_hdr *ndisc_next_option(struct nd_opt_hdr *cur, | |
169 | struct nd_opt_hdr *end) | |
170 | { | |
171 | int type; | |
172 | if (!cur || !end || cur >= end) | |
173 | return NULL; | |
174 | type = cur->nd_opt_type; | |
175 | do { | |
176 | cur = ((void *)cur) + (cur->nd_opt_len << 3); | |
177 | } while(cur < end && cur->nd_opt_type != type); | |
a02cec21 | 178 | return cur <= end && cur->nd_opt_type == type ? cur : NULL; |
1da177e4 LT |
179 | } |
180 | ||
31910575 PY |
181 | static inline int ndisc_is_useropt(struct nd_opt_hdr *opt) |
182 | { | |
e35f30c1 AF |
183 | return opt->nd_opt_type == ND_OPT_RDNSS || |
184 | opt->nd_opt_type == ND_OPT_DNSSL; | |
31910575 PY |
185 | } |
186 | ||
187 | static struct nd_opt_hdr *ndisc_next_useropt(struct nd_opt_hdr *cur, | |
188 | struct nd_opt_hdr *end) | |
189 | { | |
190 | if (!cur || !end || cur >= end) | |
191 | return NULL; | |
192 | do { | |
193 | cur = ((void *)cur) + (cur->nd_opt_len << 3); | |
194 | } while(cur < end && !ndisc_is_useropt(cur)); | |
a02cec21 | 195 | return cur <= end && ndisc_is_useropt(cur) ? cur : NULL; |
31910575 PY |
196 | } |
197 | ||
30f2a5f3 DM |
198 | struct ndisc_options *ndisc_parse_options(u8 *opt, int opt_len, |
199 | struct ndisc_options *ndopts) | |
1da177e4 LT |
200 | { |
201 | struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)opt; | |
202 | ||
203 | if (!nd_opt || opt_len < 0 || !ndopts) | |
204 | return NULL; | |
205 | memset(ndopts, 0, sizeof(*ndopts)); | |
206 | while (opt_len) { | |
207 | int l; | |
208 | if (opt_len < sizeof(struct nd_opt_hdr)) | |
209 | return NULL; | |
210 | l = nd_opt->nd_opt_len << 3; | |
211 | if (opt_len < l || l == 0) | |
212 | return NULL; | |
213 | switch (nd_opt->nd_opt_type) { | |
214 | case ND_OPT_SOURCE_LL_ADDR: | |
215 | case ND_OPT_TARGET_LL_ADDR: | |
216 | case ND_OPT_MTU: | |
217 | case ND_OPT_REDIRECT_HDR: | |
218 | if (ndopts->nd_opt_array[nd_opt->nd_opt_type]) { | |
675418d5 JP |
219 | ND_PRINTK(2, warn, |
220 | "%s: duplicated ND6 option found: type=%d\n", | |
221 | __func__, nd_opt->nd_opt_type); | |
1da177e4 LT |
222 | } else { |
223 | ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt; | |
224 | } | |
225 | break; | |
226 | case ND_OPT_PREFIX_INFO: | |
227 | ndopts->nd_opts_pi_end = nd_opt; | |
cfcabdcc | 228 | if (!ndopts->nd_opt_array[nd_opt->nd_opt_type]) |
1da177e4 LT |
229 | ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt; |
230 | break; | |
70ceb4f5 YH |
231 | #ifdef CONFIG_IPV6_ROUTE_INFO |
232 | case ND_OPT_ROUTE_INFO: | |
233 | ndopts->nd_opts_ri_end = nd_opt; | |
234 | if (!ndopts->nd_opts_ri) | |
235 | ndopts->nd_opts_ri = nd_opt; | |
236 | break; | |
237 | #endif | |
1da177e4 | 238 | default: |
31910575 PY |
239 | if (ndisc_is_useropt(nd_opt)) { |
240 | ndopts->nd_useropts_end = nd_opt; | |
241 | if (!ndopts->nd_useropts) | |
242 | ndopts->nd_useropts = nd_opt; | |
243 | } else { | |
244 | /* | |
245 | * Unknown options must be silently ignored, | |
246 | * to accommodate future extension to the | |
247 | * protocol. | |
248 | */ | |
675418d5 JP |
249 | ND_PRINTK(2, notice, |
250 | "%s: ignored unsupported option; type=%d, len=%d\n", | |
251 | __func__, | |
252 | nd_opt->nd_opt_type, | |
253 | nd_opt->nd_opt_len); | |
31910575 | 254 | } |
1da177e4 LT |
255 | } |
256 | opt_len -= l; | |
257 | nd_opt = ((void *)nd_opt) + l; | |
258 | } | |
259 | return ndopts; | |
260 | } | |
261 | ||
b71d1d42 | 262 | int ndisc_mc_map(const struct in6_addr *addr, char *buf, struct net_device *dev, int dir) |
1da177e4 LT |
263 | { |
264 | switch (dev->type) { | |
265 | case ARPHRD_ETHER: | |
266 | case ARPHRD_IEEE802: /* Not sure. Check it later. --ANK */ | |
267 | case ARPHRD_FDDI: | |
268 | ipv6_eth_mc_map(addr, buf); | |
269 | return 0; | |
1da177e4 LT |
270 | case ARPHRD_ARCNET: |
271 | ipv6_arcnet_mc_map(addr, buf); | |
272 | return 0; | |
273 | case ARPHRD_INFINIBAND: | |
a9e527e3 | 274 | ipv6_ib_mc_map(addr, dev->broadcast, buf); |
1da177e4 | 275 | return 0; |
93ca3bb5 TT |
276 | case ARPHRD_IPGRE: |
277 | return ipv6_ipgre_mc_map(addr, dev->broadcast, buf); | |
1da177e4 LT |
278 | default: |
279 | if (dir) { | |
280 | memcpy(buf, dev->broadcast, dev->addr_len); | |
281 | return 0; | |
282 | } | |
283 | } | |
284 | return -EINVAL; | |
285 | } | |
286 | ||
7159039a YH |
287 | EXPORT_SYMBOL(ndisc_mc_map); |
288 | ||
d6bf7817 ED |
289 | static u32 ndisc_hash(const void *pkey, |
290 | const struct net_device *dev, | |
2c2aba6c | 291 | __u32 *hash_rnd) |
1da177e4 | 292 | { |
2c2aba6c | 293 | return ndisc_hashfn(pkey, dev, hash_rnd); |
1da177e4 LT |
294 | } |
295 | ||
296 | static int ndisc_constructor(struct neighbour *neigh) | |
297 | { | |
298 | struct in6_addr *addr = (struct in6_addr*)&neigh->primary_key; | |
299 | struct net_device *dev = neigh->dev; | |
300 | struct inet6_dev *in6_dev; | |
301 | struct neigh_parms *parms; | |
a50feda5 | 302 | bool is_multicast = ipv6_addr_is_multicast(addr); |
1da177e4 | 303 | |
1da177e4 LT |
304 | in6_dev = in6_dev_get(dev); |
305 | if (in6_dev == NULL) { | |
1da177e4 LT |
306 | return -EINVAL; |
307 | } | |
308 | ||
309 | parms = in6_dev->nd_parms; | |
310 | __neigh_parms_put(neigh->parms); | |
311 | neigh->parms = neigh_parms_clone(parms); | |
1da177e4 LT |
312 | |
313 | neigh->type = is_multicast ? RTN_MULTICAST : RTN_UNICAST; | |
3b04ddde | 314 | if (!dev->header_ops) { |
1da177e4 LT |
315 | neigh->nud_state = NUD_NOARP; |
316 | neigh->ops = &ndisc_direct_ops; | |
8f40b161 | 317 | neigh->output = neigh_direct_output; |
1da177e4 LT |
318 | } else { |
319 | if (is_multicast) { | |
320 | neigh->nud_state = NUD_NOARP; | |
321 | ndisc_mc_map(addr, neigh->ha, dev, 1); | |
322 | } else if (dev->flags&(IFF_NOARP|IFF_LOOPBACK)) { | |
323 | neigh->nud_state = NUD_NOARP; | |
324 | memcpy(neigh->ha, dev->dev_addr, dev->addr_len); | |
325 | if (dev->flags&IFF_LOOPBACK) | |
326 | neigh->type = RTN_LOCAL; | |
327 | } else if (dev->flags&IFF_POINTOPOINT) { | |
328 | neigh->nud_state = NUD_NOARP; | |
329 | memcpy(neigh->ha, dev->broadcast, dev->addr_len); | |
330 | } | |
3b04ddde | 331 | if (dev->header_ops->cache) |
1da177e4 LT |
332 | neigh->ops = &ndisc_hh_ops; |
333 | else | |
334 | neigh->ops = &ndisc_generic_ops; | |
335 | if (neigh->nud_state&NUD_VALID) | |
336 | neigh->output = neigh->ops->connected_output; | |
337 | else | |
338 | neigh->output = neigh->ops->output; | |
339 | } | |
340 | in6_dev_put(in6_dev); | |
341 | return 0; | |
342 | } | |
343 | ||
344 | static int pndisc_constructor(struct pneigh_entry *n) | |
345 | { | |
346 | struct in6_addr *addr = (struct in6_addr*)&n->key; | |
347 | struct in6_addr maddr; | |
348 | struct net_device *dev = n->dev; | |
349 | ||
350 | if (dev == NULL || __in6_dev_get(dev) == NULL) | |
351 | return -EINVAL; | |
352 | addrconf_addr_solict_mult(addr, &maddr); | |
353 | ipv6_dev_mc_inc(dev, &maddr); | |
354 | return 0; | |
355 | } | |
356 | ||
357 | static void pndisc_destructor(struct pneigh_entry *n) | |
358 | { | |
359 | struct in6_addr *addr = (struct in6_addr*)&n->key; | |
360 | struct in6_addr maddr; | |
361 | struct net_device *dev = n->dev; | |
362 | ||
363 | if (dev == NULL || __in6_dev_get(dev) == NULL) | |
364 | return; | |
365 | addrconf_addr_solict_mult(addr, &maddr); | |
366 | ipv6_dev_mc_dec(dev, &maddr); | |
367 | } | |
368 | ||
fd0ea7db YH |
369 | static struct sk_buff *ndisc_build_skb(struct net_device *dev, |
370 | const struct in6_addr *daddr, | |
371 | const struct in6_addr *saddr, | |
372 | struct icmp6hdr *icmp6h, | |
373 | const struct in6_addr *target, | |
374 | int llinfo) | |
1da177e4 | 375 | { |
c346dca1 | 376 | struct net *net = dev_net(dev); |
1762f7e8 | 377 | struct sock *sk = net->ipv6.ndisc_sk; |
1ab1457c | 378 | struct sk_buff *skb; |
e1ec7842 | 379 | struct icmp6hdr *hdr; |
a7ae1992 HX |
380 | int hlen = LL_RESERVED_SPACE(dev); |
381 | int tlen = dev->needed_tailroom; | |
e1ec7842 | 382 | int len; |
1da177e4 | 383 | int err; |
305d552a | 384 | u8 *opt; |
1da177e4 | 385 | |
e1ec7842 YH |
386 | if (!dev->addr_len) |
387 | llinfo = 0; | |
388 | ||
389 | len = sizeof(struct icmp6hdr) + (target ? sizeof(*target) : 0); | |
390 | if (llinfo) | |
391 | len += ndisc_opt_addr_space(dev); | |
1da177e4 | 392 | |
d54a81d3 | 393 | skb = sock_alloc_send_skb(sk, |
b7dc8c39 | 394 | (sizeof(struct ipv6hdr) + |
a7ae1992 | 395 | len + hlen + tlen), |
1da177e4 | 396 | 1, &err); |
e1ec7842 | 397 | if (!skb) { |
675418d5 JP |
398 | ND_PRINTK(0, err, "ND: %s failed to allocate an skb, err=%d\n", |
399 | __func__, err); | |
305d552a | 400 | return NULL; |
1da177e4 LT |
401 | } |
402 | ||
a7ae1992 | 403 | skb_reserve(skb, hlen); |
e1ec7842 | 404 | ip6_nd_hdr(sk, skb, dev, saddr, daddr, IPPROTO_ICMPV6, len); |
1da177e4 | 405 | |
27a884dc | 406 | skb->transport_header = skb->tail; |
d10ba34b | 407 | skb_put(skb, len); |
1da177e4 | 408 | |
e1ec7842 YH |
409 | hdr = (struct icmp6hdr *)skb_transport_header(skb); |
410 | memcpy(hdr, icmp6h, sizeof(*hdr)); | |
1da177e4 | 411 | |
e1ec7842 YH |
412 | opt = skb_transport_header(skb) + sizeof(struct icmp6hdr); |
413 | if (target) { | |
4e3fd7a0 | 414 | *(struct in6_addr *)opt = *target; |
e1ec7842 YH |
415 | opt += sizeof(*target); |
416 | } | |
1da177e4 | 417 | |
e1ec7842 | 418 | if (llinfo) |
315ff09d | 419 | ndisc_fill_addr_option(opt, llinfo, dev->dev_addr, dev); |
1da177e4 | 420 | |
e1ec7842 YH |
421 | hdr->icmp6_cksum = csum_ipv6_magic(saddr, daddr, len, |
422 | IPPROTO_ICMPV6, | |
07f0757a | 423 | csum_partial(hdr, |
e1ec7842 | 424 | len, 0)); |
1da177e4 | 425 | |
305d552a BH |
426 | return skb; |
427 | } | |
428 | ||
fd0ea7db | 429 | static void ndisc_send_skb(struct sk_buff *skb, struct net_device *dev, |
fd0ea7db YH |
430 | const struct in6_addr *daddr, |
431 | const struct in6_addr *saddr, | |
432 | struct icmp6hdr *icmp6h) | |
305d552a | 433 | { |
4c9483b2 | 434 | struct flowi6 fl6; |
305d552a BH |
435 | struct dst_entry *dst; |
436 | struct net *net = dev_net(dev); | |
437 | struct sock *sk = net->ipv6.ndisc_sk; | |
438 | struct inet6_dev *idev; | |
439 | int err; | |
440 | u8 type; | |
441 | ||
442 | type = icmp6h->icmp6_type; | |
443 | ||
4c9483b2 | 444 | icmpv6_flow_init(sk, &fl6, type, saddr, daddr, dev->ifindex); |
12fd84f4 | 445 | dst = icmp6_dst_alloc(dev, &fl6); |
452edd59 | 446 | if (IS_ERR(dst)) { |
305d552a BH |
447 | kfree_skb(skb); |
448 | return; | |
449 | } | |
450 | ||
adf30907 | 451 | skb_dst_set(skb, dst); |
e1ec7842 | 452 | |
cfdf7647 ED |
453 | rcu_read_lock(); |
454 | idev = __in6_dev_get(dst->dev); | |
edf391ff | 455 | IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len); |
e1ec7842 | 456 | |
b2e0b385 | 457 | err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, dst->dev, |
6e23ae2a | 458 | dst_output); |
1da177e4 | 459 | if (!err) { |
5c5d244b | 460 | ICMP6MSGOUT_INC_STATS(net, idev, type); |
a862f6a6 | 461 | ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); |
1da177e4 LT |
462 | } |
463 | ||
cfdf7647 | 464 | rcu_read_unlock(); |
1ab1457c | 465 | } |
1da177e4 | 466 | |
305d552a BH |
467 | /* |
468 | * Send a Neighbour Discover packet | |
469 | */ | |
470 | static void __ndisc_send(struct net_device *dev, | |
305d552a BH |
471 | const struct in6_addr *daddr, |
472 | const struct in6_addr *saddr, | |
473 | struct icmp6hdr *icmp6h, const struct in6_addr *target, | |
474 | int llinfo) | |
475 | { | |
476 | struct sk_buff *skb; | |
477 | ||
478 | skb = ndisc_build_skb(dev, daddr, saddr, icmp6h, target, llinfo); | |
479 | if (!skb) | |
480 | return; | |
481 | ||
12fd84f4 | 482 | ndisc_send_skb(skb, dev, daddr, saddr, icmp6h); |
305d552a BH |
483 | } |
484 | ||
e1ec7842 | 485 | static void ndisc_send_na(struct net_device *dev, struct neighbour *neigh, |
9acd9f3a YH |
486 | const struct in6_addr *daddr, |
487 | const struct in6_addr *solicited_addr, | |
fb568637 | 488 | bool router, bool solicited, bool override, bool inc_opt) |
e1ec7842 YH |
489 | { |
490 | struct in6_addr tmpaddr; | |
491 | struct inet6_ifaddr *ifp; | |
9acd9f3a | 492 | const struct in6_addr *src_addr; |
e1ec7842 YH |
493 | struct icmp6hdr icmp6h = { |
494 | .icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT, | |
495 | }; | |
496 | ||
497 | /* for anycast or proxy, solicited_addr != src_addr */ | |
c346dca1 | 498 | ifp = ipv6_get_ifaddr(dev_net(dev), solicited_addr, dev, 1); |
e1ec7842 YH |
499 | if (ifp) { |
500 | src_addr = solicited_addr; | |
501 | if (ifp->flags & IFA_F_OPTIMISTIC) | |
502 | override = 0; | |
9f888160 | 503 | inc_opt |= ifp->idev->cnf.force_tllao; |
e1ec7842 YH |
504 | in6_ifa_put(ifp); |
505 | } else { | |
191cd582 | 506 | if (ipv6_dev_get_saddr(dev_net(dev), dev, daddr, |
c346dca1 | 507 | inet6_sk(dev_net(dev)->ipv6.ndisc_sk)->srcprefs, |
7cbca67c | 508 | &tmpaddr)) |
e1ec7842 YH |
509 | return; |
510 | src_addr = &tmpaddr; | |
511 | } | |
512 | ||
513 | icmp6h.icmp6_router = router; | |
514 | icmp6h.icmp6_solicited = solicited; | |
515 | icmp6h.icmp6_override = override; | |
516 | ||
12fd84f4 | 517 | __ndisc_send(dev, daddr, src_addr, &icmp6h, solicited_addr, |
14878f75 | 518 | inc_opt ? ND_OPT_TARGET_LL_ADDR : 0); |
e1ec7842 YH |
519 | } |
520 | ||
f47b9464 BH |
521 | static void ndisc_send_unsol_na(struct net_device *dev) |
522 | { | |
523 | struct inet6_dev *idev; | |
524 | struct inet6_ifaddr *ifa; | |
f47b9464 BH |
525 | |
526 | idev = in6_dev_get(dev); | |
527 | if (!idev) | |
528 | return; | |
529 | ||
530 | read_lock_bh(&idev->lock); | |
531 | list_for_each_entry(ifa, &idev->addr_list, if_list) { | |
9fafd65a | 532 | ndisc_send_na(dev, NULL, &in6addr_linklocal_allnodes, &ifa->addr, |
f47b9464 BH |
533 | /*router=*/ !!idev->cnf.forwarding, |
534 | /*solicited=*/ false, /*override=*/ true, | |
535 | /*inc_opt=*/ true); | |
536 | } | |
537 | read_unlock_bh(&idev->lock); | |
538 | ||
539 | in6_dev_put(idev); | |
540 | } | |
541 | ||
1da177e4 | 542 | void ndisc_send_ns(struct net_device *dev, struct neighbour *neigh, |
9acd9f3a YH |
543 | const struct in6_addr *solicit, |
544 | const struct in6_addr *daddr, const struct in6_addr *saddr) | |
1da177e4 | 545 | { |
1da177e4 | 546 | struct in6_addr addr_buf; |
e1ec7842 YH |
547 | struct icmp6hdr icmp6h = { |
548 | .icmp6_type = NDISC_NEIGHBOUR_SOLICITATION, | |
549 | }; | |
1da177e4 LT |
550 | |
551 | if (saddr == NULL) { | |
95c385b4 NH |
552 | if (ipv6_get_lladdr(dev, &addr_buf, |
553 | (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC))) | |
1da177e4 LT |
554 | return; |
555 | saddr = &addr_buf; | |
556 | } | |
557 | ||
12fd84f4 | 558 | __ndisc_send(dev, daddr, saddr, &icmp6h, solicit, |
14878f75 | 559 | !ipv6_addr_any(saddr) ? ND_OPT_SOURCE_LL_ADDR : 0); |
1da177e4 LT |
560 | } |
561 | ||
9acd9f3a YH |
562 | void ndisc_send_rs(struct net_device *dev, const struct in6_addr *saddr, |
563 | const struct in6_addr *daddr) | |
1da177e4 | 564 | { |
e1ec7842 YH |
565 | struct icmp6hdr icmp6h = { |
566 | .icmp6_type = NDISC_ROUTER_SOLICITATION, | |
567 | }; | |
95c385b4 | 568 | int send_sllao = dev->addr_len; |
95c385b4 NH |
569 | |
570 | #ifdef CONFIG_IPV6_OPTIMISTIC_DAD | |
571 | /* | |
572 | * According to section 2.2 of RFC 4429, we must not | |
573 | * send router solicitations with a sllao from | |
574 | * optimistic addresses, but we may send the solicitation | |
575 | * if we don't include the sllao. So here we check | |
576 | * if our address is optimistic, and if so, we | |
bea85195 | 577 | * suppress the inclusion of the sllao. |
95c385b4 NH |
578 | */ |
579 | if (send_sllao) { | |
c346dca1 | 580 | struct inet6_ifaddr *ifp = ipv6_get_ifaddr(dev_net(dev), saddr, |
1cab3da6 | 581 | dev, 1); |
95c385b4 NH |
582 | if (ifp) { |
583 | if (ifp->flags & IFA_F_OPTIMISTIC) { | |
ca043569 | 584 | send_sllao = 0; |
95c385b4 | 585 | } |
ca043569 | 586 | in6_ifa_put(ifp); |
95c385b4 NH |
587 | } else { |
588 | send_sllao = 0; | |
589 | } | |
590 | } | |
591 | #endif | |
12fd84f4 | 592 | __ndisc_send(dev, daddr, saddr, &icmp6h, NULL, |
14878f75 | 593 | send_sllao ? ND_OPT_SOURCE_LL_ADDR : 0); |
1da177e4 | 594 | } |
1ab1457c | 595 | |
1da177e4 LT |
596 | |
597 | static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb) | |
598 | { | |
599 | /* | |
600 | * "The sender MUST return an ICMP | |
601 | * destination unreachable" | |
602 | */ | |
603 | dst_link_failure(skb); | |
604 | kfree_skb(skb); | |
605 | } | |
606 | ||
607 | /* Called with locked neigh: either read or both */ | |
608 | ||
609 | static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb) | |
610 | { | |
611 | struct in6_addr *saddr = NULL; | |
612 | struct in6_addr mcaddr; | |
613 | struct net_device *dev = neigh->dev; | |
614 | struct in6_addr *target = (struct in6_addr *)&neigh->primary_key; | |
615 | int probes = atomic_read(&neigh->probes); | |
616 | ||
c346dca1 | 617 | if (skb && ipv6_chk_addr(dev_net(dev), &ipv6_hdr(skb)->saddr, dev, 1)) |
0660e03f | 618 | saddr = &ipv6_hdr(skb)->saddr; |
1da177e4 LT |
619 | |
620 | if ((probes -= neigh->parms->ucast_probes) < 0) { | |
621 | if (!(neigh->nud_state & NUD_VALID)) { | |
675418d5 JP |
622 | ND_PRINTK(1, dbg, |
623 | "%s: trying to ucast probe in NUD_INVALID: %pI6\n", | |
624 | __func__, target); | |
1da177e4 LT |
625 | } |
626 | ndisc_send_ns(dev, neigh, target, target, saddr); | |
627 | } else if ((probes -= neigh->parms->app_probes) < 0) { | |
628 | #ifdef CONFIG_ARPD | |
629 | neigh_app_ns(neigh); | |
630 | #endif | |
631 | } else { | |
632 | addrconf_addr_solict_mult(target, &mcaddr); | |
633 | ndisc_send_ns(dev, NULL, target, &mcaddr, saddr); | |
634 | } | |
635 | } | |
636 | ||
0736ffc0 YH |
637 | static int pndisc_is_router(const void *pkey, |
638 | struct net_device *dev) | |
fa86d322 PE |
639 | { |
640 | struct pneigh_entry *n; | |
0736ffc0 | 641 | int ret = -1; |
fa86d322 PE |
642 | |
643 | read_lock_bh(&nd_tbl.lock); | |
0736ffc0 YH |
644 | n = __pneigh_lookup(&nd_tbl, dev_net(dev), pkey, dev); |
645 | if (n) | |
646 | ret = !!(n->flags & NTF_ROUTER); | |
fa86d322 PE |
647 | read_unlock_bh(&nd_tbl.lock); |
648 | ||
0736ffc0 | 649 | return ret; |
fa86d322 PE |
650 | } |
651 | ||
1da177e4 LT |
652 | static void ndisc_recv_ns(struct sk_buff *skb) |
653 | { | |
9c70220b | 654 | struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb); |
b71d1d42 ED |
655 | const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; |
656 | const struct in6_addr *daddr = &ipv6_hdr(skb)->daddr; | |
1da177e4 | 657 | u8 *lladdr = NULL; |
27a884dc ACM |
658 | u32 ndoptlen = skb->tail - (skb->transport_header + |
659 | offsetof(struct nd_msg, opt)); | |
1da177e4 LT |
660 | struct ndisc_options ndopts; |
661 | struct net_device *dev = skb->dev; | |
662 | struct inet6_ifaddr *ifp; | |
663 | struct inet6_dev *idev = NULL; | |
664 | struct neighbour *neigh; | |
665 | int dad = ipv6_addr_any(saddr); | |
a50feda5 | 666 | bool inc; |
0736ffc0 | 667 | int is_router = -1; |
1da177e4 | 668 | |
115b0aa6 YH |
669 | if (skb->len < sizeof(struct nd_msg)) { |
670 | ND_PRINTK(2, warn, "NS: packet too short\n"); | |
671 | return; | |
672 | } | |
673 | ||
1da177e4 | 674 | if (ipv6_addr_is_multicast(&msg->target)) { |
675418d5 | 675 | ND_PRINTK(2, warn, "NS: multicast target address\n"); |
1da177e4 LT |
676 | return; |
677 | } | |
678 | ||
679 | /* | |
680 | * RFC2461 7.1.1: | |
681 | * DAD has to be destined for solicited node multicast address. | |
682 | */ | |
ca97a644 | 683 | if (dad && !ipv6_addr_is_solict_mult(daddr)) { |
675418d5 | 684 | ND_PRINTK(2, warn, "NS: bad DAD packet (wrong destination)\n"); |
1da177e4 LT |
685 | return; |
686 | } | |
687 | ||
688 | if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) { | |
675418d5 | 689 | ND_PRINTK(2, warn, "NS: invalid ND options\n"); |
1da177e4 LT |
690 | return; |
691 | } | |
692 | ||
693 | if (ndopts.nd_opts_src_lladdr) { | |
694 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, dev); | |
695 | if (!lladdr) { | |
675418d5 JP |
696 | ND_PRINTK(2, warn, |
697 | "NS: invalid link-layer address length\n"); | |
1da177e4 LT |
698 | return; |
699 | } | |
700 | ||
701 | /* RFC2461 7.1.1: | |
1ab1457c YH |
702 | * If the IP source address is the unspecified address, |
703 | * there MUST NOT be source link-layer address option | |
1da177e4 LT |
704 | * in the message. |
705 | */ | |
706 | if (dad) { | |
675418d5 JP |
707 | ND_PRINTK(2, warn, |
708 | "NS: bad DAD packet (link-layer address option)\n"); | |
1da177e4 LT |
709 | return; |
710 | } | |
711 | } | |
712 | ||
713 | inc = ipv6_addr_is_multicast(daddr); | |
714 | ||
c346dca1 | 715 | ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1); |
a18bc695 | 716 | if (ifp) { |
95c385b4 NH |
717 | |
718 | if (ifp->flags & (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC)) { | |
719 | if (dad) { | |
95c385b4 NH |
720 | /* |
721 | * We are colliding with another node | |
722 | * who is doing DAD | |
723 | * so fail our DAD process | |
724 | */ | |
725 | addrconf_dad_failure(ifp); | |
9e3be4b3 | 726 | return; |
95c385b4 NH |
727 | } else { |
728 | /* | |
729 | * This is not a dad solicitation. | |
730 | * If we are an optimistic node, | |
731 | * we should respond. | |
732 | * Otherwise, we should ignore it. | |
733 | */ | |
734 | if (!(ifp->flags & IFA_F_OPTIMISTIC)) | |
1da177e4 | 735 | goto out; |
1da177e4 | 736 | } |
1da177e4 LT |
737 | } |
738 | ||
739 | idev = ifp->idev; | |
740 | } else { | |
53b7997f YH |
741 | struct net *net = dev_net(dev); |
742 | ||
1da177e4 LT |
743 | idev = in6_dev_get(dev); |
744 | if (!idev) { | |
745 | /* XXX: count this drop? */ | |
746 | return; | |
747 | } | |
748 | ||
53b7997f | 749 | if (ipv6_chk_acast_addr(net, dev, &msg->target) || |
1ab1457c | 750 | (idev->cnf.forwarding && |
53b7997f | 751 | (net->ipv6.devconf_all->proxy_ndp || idev->cnf.proxy_ndp) && |
0736ffc0 | 752 | (is_router = pndisc_is_router(&msg->target, dev)) >= 0)) { |
a61bbcf2 | 753 | if (!(NEIGH_CB(skb)->flags & LOCALLY_ENQUEUED) && |
1da177e4 LT |
754 | skb->pkt_type != PACKET_HOST && |
755 | inc != 0 && | |
756 | idev->nd_parms->proxy_delay != 0) { | |
757 | /* | |
758 | * for anycast or proxy, | |
1ab1457c YH |
759 | * sender should delay its response |
760 | * by a random time between 0 and | |
1da177e4 LT |
761 | * MAX_ANYCAST_DELAY_TIME seconds. |
762 | * (RFC2461) -- yoshfuji | |
763 | */ | |
764 | struct sk_buff *n = skb_clone(skb, GFP_ATOMIC); | |
765 | if (n) | |
766 | pneigh_enqueue(&nd_tbl, idev->nd_parms, n); | |
767 | goto out; | |
768 | } | |
769 | } else | |
770 | goto out; | |
771 | } | |
772 | ||
0736ffc0 | 773 | if (is_router < 0) |
fb568637 | 774 | is_router = idev->cnf.forwarding; |
62dd9318 | 775 | |
1da177e4 | 776 | if (dad) { |
f3ee4010 | 777 | ndisc_send_na(dev, NULL, &in6addr_linklocal_allnodes, &msg->target, |
fb568637 | 778 | !!is_router, false, (ifp != NULL), true); |
1da177e4 LT |
779 | goto out; |
780 | } | |
781 | ||
782 | if (inc) | |
783 | NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_mcast); | |
784 | else | |
785 | NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_ucast); | |
786 | ||
1ab1457c | 787 | /* |
1da177e4 LT |
788 | * update / create cache entry |
789 | * for the source address | |
790 | */ | |
791 | neigh = __neigh_lookup(&nd_tbl, saddr, dev, | |
792 | !inc || lladdr || !dev->addr_len); | |
793 | if (neigh) | |
1ab1457c | 794 | neigh_update(neigh, lladdr, NUD_STALE, |
1da177e4 LT |
795 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
796 | NEIGH_UPDATE_F_OVERRIDE); | |
3b04ddde | 797 | if (neigh || !dev->header_ops) { |
1da177e4 | 798 | ndisc_send_na(dev, neigh, saddr, &msg->target, |
fb568637 YH |
799 | !!is_router, |
800 | true, (ifp != NULL && inc), inc); | |
1da177e4 LT |
801 | if (neigh) |
802 | neigh_release(neigh); | |
803 | } | |
804 | ||
805 | out: | |
806 | if (ifp) | |
807 | in6_ifa_put(ifp); | |
808 | else | |
809 | in6_dev_put(idev); | |
1da177e4 LT |
810 | } |
811 | ||
812 | static void ndisc_recv_na(struct sk_buff *skb) | |
813 | { | |
9c70220b | 814 | struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb); |
b71d1d42 ED |
815 | const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; |
816 | const struct in6_addr *daddr = &ipv6_hdr(skb)->daddr; | |
1da177e4 | 817 | u8 *lladdr = NULL; |
27a884dc ACM |
818 | u32 ndoptlen = skb->tail - (skb->transport_header + |
819 | offsetof(struct nd_msg, opt)); | |
1da177e4 LT |
820 | struct ndisc_options ndopts; |
821 | struct net_device *dev = skb->dev; | |
822 | struct inet6_ifaddr *ifp; | |
823 | struct neighbour *neigh; | |
824 | ||
825 | if (skb->len < sizeof(struct nd_msg)) { | |
675418d5 | 826 | ND_PRINTK(2, warn, "NA: packet too short\n"); |
1da177e4 LT |
827 | return; |
828 | } | |
829 | ||
830 | if (ipv6_addr_is_multicast(&msg->target)) { | |
675418d5 | 831 | ND_PRINTK(2, warn, "NA: target address is multicast\n"); |
1da177e4 LT |
832 | return; |
833 | } | |
834 | ||
835 | if (ipv6_addr_is_multicast(daddr) && | |
836 | msg->icmph.icmp6_solicited) { | |
675418d5 | 837 | ND_PRINTK(2, warn, "NA: solicited NA is multicasted\n"); |
1da177e4 LT |
838 | return; |
839 | } | |
1ab1457c | 840 | |
1da177e4 | 841 | if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) { |
675418d5 | 842 | ND_PRINTK(2, warn, "NS: invalid ND option\n"); |
1da177e4 LT |
843 | return; |
844 | } | |
845 | if (ndopts.nd_opts_tgt_lladdr) { | |
846 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, dev); | |
847 | if (!lladdr) { | |
675418d5 JP |
848 | ND_PRINTK(2, warn, |
849 | "NA: invalid link-layer address length\n"); | |
1da177e4 LT |
850 | return; |
851 | } | |
852 | } | |
c346dca1 | 853 | ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1); |
a18bc695 | 854 | if (ifp) { |
bd015928 DW |
855 | if (skb->pkt_type != PACKET_LOOPBACK |
856 | && (ifp->flags & IFA_F_TENTATIVE)) { | |
857 | addrconf_dad_failure(ifp); | |
858 | return; | |
1da177e4 LT |
859 | } |
860 | /* What should we make now? The advertisement | |
861 | is invalid, but ndisc specs say nothing | |
862 | about it. It could be misconfiguration, or | |
863 | an smart proxy agent tries to help us :-) | |
24fc7b86 JS |
864 | |
865 | We should not print the error if NA has been | |
866 | received from loopback - it is just our own | |
867 | unsolicited advertisement. | |
1da177e4 | 868 | */ |
24fc7b86 | 869 | if (skb->pkt_type != PACKET_LOOPBACK) |
675418d5 JP |
870 | ND_PRINTK(1, warn, |
871 | "NA: someone advertises our address %pI6 on %s!\n", | |
872 | &ifp->addr, ifp->idev->dev->name); | |
1da177e4 LT |
873 | in6_ifa_put(ifp); |
874 | return; | |
875 | } | |
876 | neigh = neigh_lookup(&nd_tbl, &msg->target, dev); | |
877 | ||
878 | if (neigh) { | |
879 | u8 old_flags = neigh->flags; | |
53b7997f | 880 | struct net *net = dev_net(dev); |
1da177e4 LT |
881 | |
882 | if (neigh->nud_state & NUD_FAILED) | |
883 | goto out; | |
884 | ||
5f3e6e9e VN |
885 | /* |
886 | * Don't update the neighbor cache entry on a proxy NA from | |
887 | * ourselves because either the proxied node is off link or it | |
888 | * has already sent a NA to us. | |
889 | */ | |
890 | if (lladdr && !memcmp(lladdr, dev->dev_addr, dev->addr_len) && | |
53b7997f YH |
891 | net->ipv6.devconf_all->forwarding && net->ipv6.devconf_all->proxy_ndp && |
892 | pneigh_lookup(&nd_tbl, net, &msg->target, dev, 0)) { | |
b20b6d97 | 893 | /* XXX: idev->cnf.proxy_ndp */ |
5f3e6e9e | 894 | goto out; |
fbea49e1 | 895 | } |
5f3e6e9e | 896 | |
1da177e4 LT |
897 | neigh_update(neigh, lladdr, |
898 | msg->icmph.icmp6_solicited ? NUD_REACHABLE : NUD_STALE, | |
899 | NEIGH_UPDATE_F_WEAK_OVERRIDE| | |
900 | (msg->icmph.icmp6_override ? NEIGH_UPDATE_F_OVERRIDE : 0)| | |
901 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
902 | (msg->icmph.icmp6_router ? NEIGH_UPDATE_F_ISROUTER : 0)); | |
903 | ||
904 | if ((old_flags & ~neigh->flags) & NTF_ROUTER) { | |
905 | /* | |
906 | * Change: router to host | |
907 | */ | |
908 | struct rt6_info *rt; | |
909 | rt = rt6_get_dflt_router(saddr, dev); | |
910 | if (rt) | |
e0a1ad73 | 911 | ip6_del_rt(rt); |
1da177e4 LT |
912 | } |
913 | ||
914 | out: | |
915 | neigh_release(neigh); | |
916 | } | |
917 | } | |
918 | ||
919 | static void ndisc_recv_rs(struct sk_buff *skb) | |
920 | { | |
9c70220b | 921 | struct rs_msg *rs_msg = (struct rs_msg *)skb_transport_header(skb); |
1da177e4 LT |
922 | unsigned long ndoptlen = skb->len - sizeof(*rs_msg); |
923 | struct neighbour *neigh; | |
924 | struct inet6_dev *idev; | |
b71d1d42 | 925 | const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; |
1da177e4 LT |
926 | struct ndisc_options ndopts; |
927 | u8 *lladdr = NULL; | |
928 | ||
929 | if (skb->len < sizeof(*rs_msg)) | |
930 | return; | |
931 | ||
cfdf7647 | 932 | idev = __in6_dev_get(skb->dev); |
1da177e4 | 933 | if (!idev) { |
675418d5 | 934 | ND_PRINTK(1, err, "RS: can't find in6 device\n"); |
1da177e4 LT |
935 | return; |
936 | } | |
937 | ||
938 | /* Don't accept RS if we're not in router mode */ | |
939 | if (!idev->cnf.forwarding) | |
940 | goto out; | |
941 | ||
942 | /* | |
943 | * Don't update NCE if src = ::; | |
944 | * this implies that the source node has no ip address assigned yet. | |
945 | */ | |
946 | if (ipv6_addr_any(saddr)) | |
947 | goto out; | |
948 | ||
949 | /* Parse ND options */ | |
950 | if (!ndisc_parse_options(rs_msg->opt, ndoptlen, &ndopts)) { | |
675418d5 | 951 | ND_PRINTK(2, notice, "NS: invalid ND option, ignored\n"); |
1da177e4 LT |
952 | goto out; |
953 | } | |
954 | ||
955 | if (ndopts.nd_opts_src_lladdr) { | |
956 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, | |
957 | skb->dev); | |
958 | if (!lladdr) | |
959 | goto out; | |
960 | } | |
961 | ||
962 | neigh = __neigh_lookup(&nd_tbl, saddr, skb->dev, 1); | |
963 | if (neigh) { | |
964 | neigh_update(neigh, lladdr, NUD_STALE, | |
965 | NEIGH_UPDATE_F_WEAK_OVERRIDE| | |
966 | NEIGH_UPDATE_F_OVERRIDE| | |
967 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER); | |
968 | neigh_release(neigh); | |
969 | } | |
970 | out: | |
cfdf7647 | 971 | return; |
1da177e4 LT |
972 | } |
973 | ||
31910575 PY |
974 | static void ndisc_ra_useropt(struct sk_buff *ra, struct nd_opt_hdr *opt) |
975 | { | |
976 | struct icmp6hdr *icmp6h = (struct icmp6hdr *)skb_transport_header(ra); | |
977 | struct sk_buff *skb; | |
978 | struct nlmsghdr *nlh; | |
979 | struct nduseroptmsg *ndmsg; | |
c346dca1 | 980 | struct net *net = dev_net(ra->dev); |
31910575 PY |
981 | int err; |
982 | int base_size = NLMSG_ALIGN(sizeof(struct nduseroptmsg) | |
983 | + (opt->nd_opt_len << 3)); | |
984 | size_t msg_size = base_size + nla_total_size(sizeof(struct in6_addr)); | |
985 | ||
986 | skb = nlmsg_new(msg_size, GFP_ATOMIC); | |
987 | if (skb == NULL) { | |
988 | err = -ENOBUFS; | |
989 | goto errout; | |
990 | } | |
991 | ||
992 | nlh = nlmsg_put(skb, 0, 0, RTM_NEWNDUSEROPT, base_size, 0); | |
993 | if (nlh == NULL) { | |
994 | goto nla_put_failure; | |
995 | } | |
996 | ||
997 | ndmsg = nlmsg_data(nlh); | |
998 | ndmsg->nduseropt_family = AF_INET6; | |
dbb2ed24 | 999 | ndmsg->nduseropt_ifindex = ra->dev->ifindex; |
31910575 PY |
1000 | ndmsg->nduseropt_icmp_type = icmp6h->icmp6_type; |
1001 | ndmsg->nduseropt_icmp_code = icmp6h->icmp6_code; | |
1002 | ndmsg->nduseropt_opts_len = opt->nd_opt_len << 3; | |
1003 | ||
1004 | memcpy(ndmsg + 1, opt, opt->nd_opt_len << 3); | |
1005 | ||
c78679e8 DM |
1006 | if (nla_put(skb, NDUSEROPT_SRCADDR, sizeof(struct in6_addr), |
1007 | &ipv6_hdr(ra)->saddr)) | |
1008 | goto nla_put_failure; | |
31910575 PY |
1009 | nlmsg_end(skb, nlh); |
1010 | ||
1ce85fe4 | 1011 | rtnl_notify(skb, net, 0, RTNLGRP_ND_USEROPT, NULL, GFP_ATOMIC); |
31910575 PY |
1012 | return; |
1013 | ||
1014 | nla_put_failure: | |
1015 | nlmsg_free(skb); | |
1016 | err = -EMSGSIZE; | |
1017 | errout: | |
a18bc695 | 1018 | rtnl_set_sk_err(net, RTNLGRP_ND_USEROPT, err); |
31910575 PY |
1019 | } |
1020 | ||
1da177e4 LT |
1021 | static void ndisc_router_discovery(struct sk_buff *skb) |
1022 | { | |
9c70220b | 1023 | struct ra_msg *ra_msg = (struct ra_msg *)skb_transport_header(skb); |
1da177e4 LT |
1024 | struct neighbour *neigh = NULL; |
1025 | struct inet6_dev *in6_dev; | |
65f5c7c1 | 1026 | struct rt6_info *rt = NULL; |
1da177e4 LT |
1027 | int lifetime; |
1028 | struct ndisc_options ndopts; | |
1029 | int optlen; | |
ebacaaa0 | 1030 | unsigned int pref = 0; |
1da177e4 LT |
1031 | |
1032 | __u8 * opt = (__u8 *)(ra_msg + 1); | |
1033 | ||
27a884dc | 1034 | optlen = (skb->tail - skb->transport_header) - sizeof(struct ra_msg); |
1da177e4 | 1035 | |
0660e03f | 1036 | if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) { |
675418d5 | 1037 | ND_PRINTK(2, warn, "RA: source address is not link-local\n"); |
1da177e4 LT |
1038 | return; |
1039 | } | |
1040 | if (optlen < 0) { | |
675418d5 | 1041 | ND_PRINTK(2, warn, "RA: packet too short\n"); |
1da177e4 LT |
1042 | return; |
1043 | } | |
1044 | ||
de357cc0 | 1045 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 | 1046 | if (skb->ndisc_nodetype == NDISC_NODETYPE_HOST) { |
675418d5 | 1047 | ND_PRINTK(2, warn, "RA: from host or unauthorized router\n"); |
fadf6bf0 TF |
1048 | return; |
1049 | } | |
de357cc0 | 1050 | #endif |
fadf6bf0 | 1051 | |
1da177e4 LT |
1052 | /* |
1053 | * set the RA_RECV flag in the interface | |
1054 | */ | |
1055 | ||
cfdf7647 | 1056 | in6_dev = __in6_dev_get(skb->dev); |
1da177e4 | 1057 | if (in6_dev == NULL) { |
675418d5 JP |
1058 | ND_PRINTK(0, err, "RA: can't find inet6 device for %s\n", |
1059 | skb->dev->name); | |
1da177e4 LT |
1060 | return; |
1061 | } | |
1da177e4 LT |
1062 | |
1063 | if (!ndisc_parse_options(opt, optlen, &ndopts)) { | |
675418d5 | 1064 | ND_PRINTK(2, warn, "RA: invalid ND options\n"); |
1da177e4 LT |
1065 | return; |
1066 | } | |
1067 | ||
aeaf6e9d | 1068 | if (!ipv6_accept_ra(in6_dev)) |
31ce8c71 DW |
1069 | goto skip_linkparms; |
1070 | ||
de357cc0 | 1071 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 TF |
1072 | /* skip link-specific parameters from interior routers */ |
1073 | if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT) | |
1074 | goto skip_linkparms; | |
de357cc0 | 1075 | #endif |
fadf6bf0 | 1076 | |
1da177e4 LT |
1077 | if (in6_dev->if_flags & IF_RS_SENT) { |
1078 | /* | |
1079 | * flag that an RA was received after an RS was sent | |
1080 | * out on this interface. | |
1081 | */ | |
1082 | in6_dev->if_flags |= IF_RA_RCVD; | |
1083 | } | |
1084 | ||
1085 | /* | |
1086 | * Remember the managed/otherconf flags from most recently | |
1087 | * received RA message (RFC 2462) -- yoshfuji | |
1088 | */ | |
1089 | in6_dev->if_flags = (in6_dev->if_flags & ~(IF_RA_MANAGED | | |
1090 | IF_RA_OTHERCONF)) | | |
1091 | (ra_msg->icmph.icmp6_addrconf_managed ? | |
1092 | IF_RA_MANAGED : 0) | | |
1093 | (ra_msg->icmph.icmp6_addrconf_other ? | |
1094 | IF_RA_OTHERCONF : 0); | |
1095 | ||
65f5c7c1 YH |
1096 | if (!in6_dev->cnf.accept_ra_defrtr) |
1097 | goto skip_defrtr; | |
1098 | ||
9f56220f AH |
1099 | if (ipv6_chk_addr(dev_net(in6_dev->dev), &ipv6_hdr(skb)->saddr, NULL, 0)) |
1100 | goto skip_defrtr; | |
1101 | ||
1da177e4 LT |
1102 | lifetime = ntohs(ra_msg->icmph.icmp6_rt_lifetime); |
1103 | ||
ebacaaa0 YH |
1104 | #ifdef CONFIG_IPV6_ROUTER_PREF |
1105 | pref = ra_msg->icmph.icmp6_router_pref; | |
1106 | /* 10b is handled as if it were 00b (medium) */ | |
930d6ff2 | 1107 | if (pref == ICMPV6_ROUTER_PREF_INVALID || |
6d5b78cd | 1108 | !in6_dev->cnf.accept_ra_rtr_pref) |
ebacaaa0 YH |
1109 | pref = ICMPV6_ROUTER_PREF_MEDIUM; |
1110 | #endif | |
1111 | ||
0660e03f | 1112 | rt = rt6_get_dflt_router(&ipv6_hdr(skb)->saddr, skb->dev); |
1da177e4 | 1113 | |
eb857186 DM |
1114 | if (rt) { |
1115 | neigh = dst_neigh_lookup(&rt->dst, &ipv6_hdr(skb)->saddr); | |
1116 | if (!neigh) { | |
675418d5 JP |
1117 | ND_PRINTK(0, err, |
1118 | "RA: %s got default router without neighbour\n", | |
1119 | __func__); | |
94e187c0 | 1120 | ip6_rt_put(rt); |
eb857186 DM |
1121 | return; |
1122 | } | |
1123 | } | |
1da177e4 | 1124 | if (rt && lifetime == 0) { |
e0a1ad73 | 1125 | ip6_del_rt(rt); |
1da177e4 LT |
1126 | rt = NULL; |
1127 | } | |
1128 | ||
1129 | if (rt == NULL && lifetime) { | |
675418d5 | 1130 | ND_PRINTK(3, dbg, "RA: adding default router\n"); |
1da177e4 | 1131 | |
0660e03f | 1132 | rt = rt6_add_dflt_router(&ipv6_hdr(skb)->saddr, skb->dev, pref); |
1da177e4 | 1133 | if (rt == NULL) { |
675418d5 JP |
1134 | ND_PRINTK(0, err, |
1135 | "RA: %s failed to add default route\n", | |
1136 | __func__); | |
1da177e4 LT |
1137 | return; |
1138 | } | |
1139 | ||
eb857186 | 1140 | neigh = dst_neigh_lookup(&rt->dst, &ipv6_hdr(skb)->saddr); |
1da177e4 | 1141 | if (neigh == NULL) { |
675418d5 JP |
1142 | ND_PRINTK(0, err, |
1143 | "RA: %s got default router without neighbour\n", | |
1144 | __func__); | |
94e187c0 | 1145 | ip6_rt_put(rt); |
1da177e4 LT |
1146 | return; |
1147 | } | |
1148 | neigh->flags |= NTF_ROUTER; | |
ebacaaa0 | 1149 | } else if (rt) { |
22441cfa | 1150 | rt->rt6i_flags = (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); |
1da177e4 LT |
1151 | } |
1152 | ||
1153 | if (rt) | |
1716a961 | 1154 | rt6_set_expires(rt, jiffies + (HZ * lifetime)); |
1da177e4 LT |
1155 | if (ra_msg->icmph.icmp6_hop_limit) { |
1156 | in6_dev->cnf.hop_limit = ra_msg->icmph.icmp6_hop_limit; | |
1157 | if (rt) | |
defb3519 DM |
1158 | dst_metric_set(&rt->dst, RTAX_HOPLIMIT, |
1159 | ra_msg->icmph.icmp6_hop_limit); | |
1da177e4 LT |
1160 | } |
1161 | ||
65f5c7c1 YH |
1162 | skip_defrtr: |
1163 | ||
1da177e4 LT |
1164 | /* |
1165 | * Update Reachable Time and Retrans Timer | |
1166 | */ | |
1167 | ||
1168 | if (in6_dev->nd_parms) { | |
1169 | unsigned long rtime = ntohl(ra_msg->retrans_timer); | |
1170 | ||
1171 | if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/HZ) { | |
1172 | rtime = (rtime*HZ)/1000; | |
1173 | if (rtime < HZ/10) | |
1174 | rtime = HZ/10; | |
1175 | in6_dev->nd_parms->retrans_time = rtime; | |
1176 | in6_dev->tstamp = jiffies; | |
1177 | inet6_ifinfo_notify(RTM_NEWLINK, in6_dev); | |
1178 | } | |
1179 | ||
1180 | rtime = ntohl(ra_msg->reachable_time); | |
1181 | if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/(3*HZ)) { | |
1182 | rtime = (rtime*HZ)/1000; | |
1183 | ||
1184 | if (rtime < HZ/10) | |
1185 | rtime = HZ/10; | |
1186 | ||
1187 | if (rtime != in6_dev->nd_parms->base_reachable_time) { | |
1188 | in6_dev->nd_parms->base_reachable_time = rtime; | |
1189 | in6_dev->nd_parms->gc_staletime = 3 * rtime; | |
1190 | in6_dev->nd_parms->reachable_time = neigh_rand_reach_time(rtime); | |
1191 | in6_dev->tstamp = jiffies; | |
1192 | inet6_ifinfo_notify(RTM_NEWLINK, in6_dev); | |
1193 | } | |
1194 | } | |
1195 | } | |
1196 | ||
fadf6bf0 TF |
1197 | skip_linkparms: |
1198 | ||
1da177e4 LT |
1199 | /* |
1200 | * Process options. | |
1201 | */ | |
1202 | ||
1203 | if (!neigh) | |
0660e03f | 1204 | neigh = __neigh_lookup(&nd_tbl, &ipv6_hdr(skb)->saddr, |
1da177e4 LT |
1205 | skb->dev, 1); |
1206 | if (neigh) { | |
1207 | u8 *lladdr = NULL; | |
1208 | if (ndopts.nd_opts_src_lladdr) { | |
1209 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, | |
1210 | skb->dev); | |
1211 | if (!lladdr) { | |
675418d5 JP |
1212 | ND_PRINTK(2, warn, |
1213 | "RA: invalid link-layer address length\n"); | |
1da177e4 LT |
1214 | goto out; |
1215 | } | |
1216 | } | |
1217 | neigh_update(neigh, lladdr, NUD_STALE, | |
1218 | NEIGH_UPDATE_F_WEAK_OVERRIDE| | |
1219 | NEIGH_UPDATE_F_OVERRIDE| | |
1220 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
1221 | NEIGH_UPDATE_F_ISROUTER); | |
1222 | } | |
1223 | ||
aeaf6e9d | 1224 | if (!ipv6_accept_ra(in6_dev)) |
31ce8c71 DW |
1225 | goto out; |
1226 | ||
70ceb4f5 | 1227 | #ifdef CONFIG_IPV6_ROUTE_INFO |
9f56220f AH |
1228 | if (ipv6_chk_addr(dev_net(in6_dev->dev), &ipv6_hdr(skb)->saddr, NULL, 0)) |
1229 | goto skip_routeinfo; | |
1230 | ||
09c884d4 | 1231 | if (in6_dev->cnf.accept_ra_rtr_pref && ndopts.nd_opts_ri) { |
70ceb4f5 YH |
1232 | struct nd_opt_hdr *p; |
1233 | for (p = ndopts.nd_opts_ri; | |
1234 | p; | |
1235 | p = ndisc_next_option(p, ndopts.nd_opts_ri_end)) { | |
6294e000 YH |
1236 | struct route_info *ri = (struct route_info *)p; |
1237 | #ifdef CONFIG_IPV6_NDISC_NODETYPE | |
1238 | if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT && | |
1239 | ri->prefix_len == 0) | |
1240 | continue; | |
1241 | #endif | |
1242 | if (ri->prefix_len > in6_dev->cnf.accept_ra_rt_info_max_plen) | |
09c884d4 | 1243 | continue; |
70ceb4f5 | 1244 | rt6_route_rcv(skb->dev, (u8*)p, (p->nd_opt_len) << 3, |
0660e03f | 1245 | &ipv6_hdr(skb)->saddr); |
70ceb4f5 YH |
1246 | } |
1247 | } | |
9f56220f AH |
1248 | |
1249 | skip_routeinfo: | |
70ceb4f5 YH |
1250 | #endif |
1251 | ||
de357cc0 | 1252 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 TF |
1253 | /* skip link-specific ndopts from interior routers */ |
1254 | if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT) | |
1255 | goto out; | |
de357cc0 | 1256 | #endif |
fadf6bf0 | 1257 | |
c4fd30eb | 1258 | if (in6_dev->cnf.accept_ra_pinfo && ndopts.nd_opts_pi) { |
1da177e4 LT |
1259 | struct nd_opt_hdr *p; |
1260 | for (p = ndopts.nd_opts_pi; | |
1261 | p; | |
1262 | p = ndisc_next_option(p, ndopts.nd_opts_pi_end)) { | |
e6bff995 NH |
1263 | addrconf_prefix_rcv(skb->dev, (u8 *)p, |
1264 | (p->nd_opt_len) << 3, | |
1265 | ndopts.nd_opts_src_lladdr != NULL); | |
1da177e4 LT |
1266 | } |
1267 | } | |
1268 | ||
1269 | if (ndopts.nd_opts_mtu) { | |
e69a4adc | 1270 | __be32 n; |
1da177e4 LT |
1271 | u32 mtu; |
1272 | ||
e69a4adc AV |
1273 | memcpy(&n, ((u8*)(ndopts.nd_opts_mtu+1))+2, sizeof(mtu)); |
1274 | mtu = ntohl(n); | |
1da177e4 LT |
1275 | |
1276 | if (mtu < IPV6_MIN_MTU || mtu > skb->dev->mtu) { | |
675418d5 | 1277 | ND_PRINTK(2, warn, "RA: invalid mtu: %d\n", mtu); |
1da177e4 LT |
1278 | } else if (in6_dev->cnf.mtu6 != mtu) { |
1279 | in6_dev->cnf.mtu6 = mtu; | |
1280 | ||
1281 | if (rt) | |
defb3519 | 1282 | dst_metric_set(&rt->dst, RTAX_MTU, mtu); |
1da177e4 LT |
1283 | |
1284 | rt6_mtu_change(skb->dev, mtu); | |
1285 | } | |
1286 | } | |
1ab1457c | 1287 | |
31910575 | 1288 | if (ndopts.nd_useropts) { |
61cf46ad YH |
1289 | struct nd_opt_hdr *p; |
1290 | for (p = ndopts.nd_useropts; | |
1291 | p; | |
1292 | p = ndisc_next_useropt(p, ndopts.nd_useropts_end)) { | |
1293 | ndisc_ra_useropt(skb, p); | |
31910575 PY |
1294 | } |
1295 | } | |
1296 | ||
1da177e4 | 1297 | if (ndopts.nd_opts_tgt_lladdr || ndopts.nd_opts_rh) { |
675418d5 | 1298 | ND_PRINTK(2, warn, "RA: invalid RA options\n"); |
1da177e4 LT |
1299 | } |
1300 | out: | |
94e187c0 | 1301 | ip6_rt_put(rt); |
eb857186 | 1302 | if (neigh) |
1da177e4 | 1303 | neigh_release(neigh); |
1da177e4 LT |
1304 | } |
1305 | ||
1306 | static void ndisc_redirect_rcv(struct sk_buff *skb) | |
1307 | { | |
093d04d4 DJ |
1308 | u8 *hdr; |
1309 | struct ndisc_options ndopts; | |
1310 | struct rd_msg *msg = (struct rd_msg *)skb_transport_header(skb); | |
1311 | u32 ndoptlen = skb->tail - (skb->transport_header + | |
1312 | offsetof(struct rd_msg, opt)); | |
1313 | ||
de357cc0 | 1314 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 TF |
1315 | switch (skb->ndisc_nodetype) { |
1316 | case NDISC_NODETYPE_HOST: | |
1317 | case NDISC_NODETYPE_NODEFAULT: | |
675418d5 JP |
1318 | ND_PRINTK(2, warn, |
1319 | "Redirect: from host or unauthorized router\n"); | |
fadf6bf0 TF |
1320 | return; |
1321 | } | |
de357cc0 | 1322 | #endif |
fadf6bf0 | 1323 | |
0660e03f | 1324 | if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) { |
675418d5 JP |
1325 | ND_PRINTK(2, warn, |
1326 | "Redirect: source address is not link-local\n"); | |
1da177e4 LT |
1327 | return; |
1328 | } | |
1329 | ||
093d04d4 DJ |
1330 | if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) |
1331 | return; | |
1332 | ||
1333 | if (!ndopts.nd_opts_rh) | |
1334 | return; | |
1335 | ||
1336 | hdr = (u8 *)ndopts.nd_opts_rh; | |
1337 | hdr += 8; | |
1338 | if (!pskb_pull(skb, hdr - skb_transport_header(skb))) | |
1339 | return; | |
1340 | ||
b94f1c09 | 1341 | icmpv6_notify(skb, NDISC_REDIRECT, 0, 0); |
1da177e4 LT |
1342 | } |
1343 | ||
4991969a | 1344 | void ndisc_send_redirect(struct sk_buff *skb, const struct in6_addr *target) |
1da177e4 | 1345 | { |
1762f7e8 | 1346 | struct net_device *dev = skb->dev; |
c346dca1 | 1347 | struct net *net = dev_net(dev); |
1762f7e8 | 1348 | struct sock *sk = net->ipv6.ndisc_sk; |
71bcdba0 | 1349 | int len = sizeof(struct rd_msg); |
fbfe95a4 | 1350 | struct inet_peer *peer; |
1da177e4 | 1351 | struct sk_buff *buff; |
71bcdba0 | 1352 | struct rd_msg *msg; |
1da177e4 | 1353 | struct in6_addr saddr_buf; |
1da177e4 LT |
1354 | struct rt6_info *rt; |
1355 | struct dst_entry *dst; | |
1356 | struct inet6_dev *idev; | |
4c9483b2 | 1357 | struct flowi6 fl6; |
1da177e4 | 1358 | u8 *opt; |
a7ae1992 | 1359 | int hlen, tlen; |
1da177e4 LT |
1360 | int rd_len; |
1361 | int err; | |
1da177e4 | 1362 | u8 ha_buf[MAX_ADDR_LEN], *ha = NULL; |
1d861aa4 | 1363 | bool ret; |
1da177e4 | 1364 | |
95c385b4 | 1365 | if (ipv6_get_lladdr(dev, &saddr_buf, IFA_F_TENTATIVE)) { |
675418d5 JP |
1366 | ND_PRINTK(2, warn, "Redirect: no link-local address on %s\n", |
1367 | dev->name); | |
1ab1457c YH |
1368 | return; |
1369 | } | |
1da177e4 | 1370 | |
0660e03f | 1371 | if (!ipv6_addr_equal(&ipv6_hdr(skb)->daddr, target) && |
bf0b48df | 1372 | ipv6_addr_type(target) != (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) { |
675418d5 JP |
1373 | ND_PRINTK(2, warn, |
1374 | "Redirect: target address is not link-local unicast\n"); | |
29556526 LY |
1375 | return; |
1376 | } | |
1377 | ||
4c9483b2 | 1378 | icmpv6_flow_init(sk, &fl6, NDISC_REDIRECT, |
95e41e93 | 1379 | &saddr_buf, &ipv6_hdr(skb)->saddr, dev->ifindex); |
1da177e4 | 1380 | |
4c9483b2 | 1381 | dst = ip6_route_output(net, NULL, &fl6); |
5095d64d RL |
1382 | if (dst->error) { |
1383 | dst_release(dst); | |
1da177e4 | 1384 | return; |
5095d64d | 1385 | } |
4c9483b2 | 1386 | dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), NULL, 0); |
452edd59 | 1387 | if (IS_ERR(dst)) |
1da177e4 | 1388 | return; |
1da177e4 LT |
1389 | |
1390 | rt = (struct rt6_info *) dst; | |
1391 | ||
1392 | if (rt->rt6i_flags & RTF_GATEWAY) { | |
675418d5 JP |
1393 | ND_PRINTK(2, warn, |
1394 | "Redirect: destination is not a neighbour\n"); | |
d73f0801 | 1395 | goto release; |
1da177e4 | 1396 | } |
1d861aa4 DM |
1397 | peer = inet_getpeer_v6(net->ipv6.peers, &rt->rt6i_dst.addr, 1); |
1398 | ret = inet_peer_xrlim_allow(peer, 1*HZ); | |
1399 | if (peer) | |
1400 | inet_putpeer(peer); | |
1401 | if (!ret) | |
d73f0801 | 1402 | goto release; |
1da177e4 LT |
1403 | |
1404 | if (dev->addr_len) { | |
4991969a DM |
1405 | struct neighbour *neigh = dst_neigh_lookup(skb_dst(skb), target); |
1406 | if (!neigh) { | |
675418d5 JP |
1407 | ND_PRINTK(2, warn, |
1408 | "Redirect: no neigh for target address\n"); | |
4991969a DM |
1409 | goto release; |
1410 | } | |
1411 | ||
1da177e4 LT |
1412 | read_lock_bh(&neigh->lock); |
1413 | if (neigh->nud_state & NUD_VALID) { | |
1414 | memcpy(ha_buf, neigh->ha, dev->addr_len); | |
1415 | read_unlock_bh(&neigh->lock); | |
1416 | ha = ha_buf; | |
1417 | len += ndisc_opt_addr_space(dev); | |
1418 | } else | |
1419 | read_unlock_bh(&neigh->lock); | |
4991969a DM |
1420 | |
1421 | neigh_release(neigh); | |
1da177e4 LT |
1422 | } |
1423 | ||
1424 | rd_len = min_t(unsigned int, | |
1425 | IPV6_MIN_MTU-sizeof(struct ipv6hdr)-len, skb->len + 8); | |
1426 | rd_len &= ~0x7; | |
1427 | len += rd_len; | |
1428 | ||
a7ae1992 HX |
1429 | hlen = LL_RESERVED_SPACE(dev); |
1430 | tlen = dev->needed_tailroom; | |
d54a81d3 | 1431 | buff = sock_alloc_send_skb(sk, |
b7dc8c39 | 1432 | (sizeof(struct ipv6hdr) + |
a7ae1992 | 1433 | len + hlen + tlen), |
1da177e4 LT |
1434 | 1, &err); |
1435 | if (buff == NULL) { | |
675418d5 JP |
1436 | ND_PRINTK(0, err, |
1437 | "Redirect: %s failed to allocate an skb, err=%d\n", | |
1438 | __func__, err); | |
d73f0801 | 1439 | goto release; |
1da177e4 LT |
1440 | } |
1441 | ||
a7ae1992 | 1442 | skb_reserve(buff, hlen); |
0660e03f | 1443 | ip6_nd_hdr(sk, buff, dev, &saddr_buf, &ipv6_hdr(skb)->saddr, |
1da177e4 LT |
1444 | IPPROTO_ICMPV6, len); |
1445 | ||
27a884dc | 1446 | skb_set_transport_header(buff, skb_tail_pointer(buff) - buff->data); |
d10ba34b | 1447 | skb_put(buff, len); |
71bcdba0 | 1448 | msg = (struct rd_msg *)icmp6_hdr(buff); |
1da177e4 | 1449 | |
71bcdba0 YH |
1450 | memset(&msg->icmph, 0, sizeof(struct icmp6hdr)); |
1451 | msg->icmph.icmp6_type = NDISC_REDIRECT; | |
1da177e4 LT |
1452 | |
1453 | /* | |
1454 | * copy target and destination addresses | |
1455 | */ | |
1456 | ||
71bcdba0 YH |
1457 | msg->target = *target; |
1458 | msg->dest = ipv6_hdr(skb)->daddr; | |
1da177e4 | 1459 | |
71bcdba0 | 1460 | opt = msg->opt; |
1da177e4 LT |
1461 | |
1462 | /* | |
1463 | * include target_address option | |
1464 | */ | |
1465 | ||
1466 | if (ha) | |
315ff09d | 1467 | opt = ndisc_fill_addr_option(opt, ND_OPT_TARGET_LL_ADDR, ha, dev); |
1da177e4 LT |
1468 | |
1469 | /* | |
1470 | * build redirect option and copy skb over to the new packet. | |
1471 | */ | |
1472 | ||
1ab1457c | 1473 | memset(opt, 0, 8); |
1da177e4 LT |
1474 | *(opt++) = ND_OPT_REDIRECT_HDR; |
1475 | *(opt++) = (rd_len >> 3); | |
1476 | opt += 6; | |
1477 | ||
0660e03f | 1478 | memcpy(opt, ipv6_hdr(skb), rd_len - 8); |
1da177e4 | 1479 | |
71bcdba0 YH |
1480 | msg->icmph.icmp6_cksum = csum_ipv6_magic(&saddr_buf, &ipv6_hdr(skb)->saddr, |
1481 | len, IPPROTO_ICMPV6, | |
1482 | csum_partial(msg, len, 0)); | |
1da177e4 | 1483 | |
adf30907 | 1484 | skb_dst_set(buff, dst); |
cfdf7647 ED |
1485 | rcu_read_lock(); |
1486 | idev = __in6_dev_get(dst->dev); | |
edf391ff | 1487 | IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len); |
b2e0b385 | 1488 | err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, buff, NULL, dst->dev, |
6e23ae2a | 1489 | dst_output); |
1da177e4 | 1490 | if (!err) { |
5c5d244b | 1491 | ICMP6MSGOUT_INC_STATS(net, idev, NDISC_REDIRECT); |
a862f6a6 | 1492 | ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); |
1da177e4 LT |
1493 | } |
1494 | ||
cfdf7647 | 1495 | rcu_read_unlock(); |
d73f0801 IJ |
1496 | return; |
1497 | ||
1498 | release: | |
1499 | dst_release(dst); | |
1da177e4 LT |
1500 | } |
1501 | ||
1502 | static void pndisc_redo(struct sk_buff *skb) | |
1503 | { | |
140e26fc | 1504 | ndisc_recv_ns(skb); |
1da177e4 LT |
1505 | kfree_skb(skb); |
1506 | } | |
1507 | ||
1508 | int ndisc_rcv(struct sk_buff *skb) | |
1509 | { | |
1510 | struct nd_msg *msg; | |
1511 | ||
1512 | if (!pskb_may_pull(skb, skb->len)) | |
1513 | return 0; | |
1514 | ||
9c70220b | 1515 | msg = (struct nd_msg *)skb_transport_header(skb); |
1da177e4 | 1516 | |
9c70220b | 1517 | __skb_push(skb, skb->data - skb_transport_header(skb)); |
1da177e4 | 1518 | |
0660e03f | 1519 | if (ipv6_hdr(skb)->hop_limit != 255) { |
675418d5 JP |
1520 | ND_PRINTK(2, warn, "NDISC: invalid hop-limit: %d\n", |
1521 | ipv6_hdr(skb)->hop_limit); | |
1da177e4 LT |
1522 | return 0; |
1523 | } | |
1524 | ||
1525 | if (msg->icmph.icmp6_code != 0) { | |
675418d5 JP |
1526 | ND_PRINTK(2, warn, "NDISC: invalid ICMPv6 code: %d\n", |
1527 | msg->icmph.icmp6_code); | |
1da177e4 LT |
1528 | return 0; |
1529 | } | |
1530 | ||
a61bbcf2 PM |
1531 | memset(NEIGH_CB(skb), 0, sizeof(struct neighbour_cb)); |
1532 | ||
1da177e4 LT |
1533 | switch (msg->icmph.icmp6_type) { |
1534 | case NDISC_NEIGHBOUR_SOLICITATION: | |
1535 | ndisc_recv_ns(skb); | |
1536 | break; | |
1537 | ||
1538 | case NDISC_NEIGHBOUR_ADVERTISEMENT: | |
1539 | ndisc_recv_na(skb); | |
1540 | break; | |
1541 | ||
1542 | case NDISC_ROUTER_SOLICITATION: | |
1543 | ndisc_recv_rs(skb); | |
1544 | break; | |
1545 | ||
1546 | case NDISC_ROUTER_ADVERTISEMENT: | |
1547 | ndisc_router_discovery(skb); | |
1548 | break; | |
1549 | ||
1550 | case NDISC_REDIRECT: | |
1551 | ndisc_redirect_rcv(skb); | |
1552 | break; | |
3ff50b79 | 1553 | } |
1da177e4 LT |
1554 | |
1555 | return 0; | |
1556 | } | |
1557 | ||
1558 | static int ndisc_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1559 | { | |
1560 | struct net_device *dev = ptr; | |
c346dca1 | 1561 | struct net *net = dev_net(dev); |
5cb04436 | 1562 | struct inet6_dev *idev; |
1da177e4 LT |
1563 | |
1564 | switch (event) { | |
1565 | case NETDEV_CHANGEADDR: | |
1566 | neigh_changeaddr(&nd_tbl, dev); | |
5b7c931d | 1567 | fib6_run_gc(~0UL, net); |
5cb04436 HFS |
1568 | idev = in6_dev_get(dev); |
1569 | if (!idev) | |
1570 | break; | |
1571 | if (idev->cnf.ndisc_notify) | |
1572 | ndisc_send_unsol_na(dev); | |
1573 | in6_dev_put(idev); | |
1da177e4 LT |
1574 | break; |
1575 | case NETDEV_DOWN: | |
1576 | neigh_ifdown(&nd_tbl, dev); | |
5b7c931d | 1577 | fib6_run_gc(~0UL, net); |
1da177e4 | 1578 | break; |
f47b9464 BH |
1579 | case NETDEV_NOTIFY_PEERS: |
1580 | ndisc_send_unsol_na(dev); | |
1581 | break; | |
1da177e4 LT |
1582 | default: |
1583 | break; | |
1584 | } | |
1585 | ||
1586 | return NOTIFY_DONE; | |
1587 | } | |
1588 | ||
1589 | static struct notifier_block ndisc_netdev_notifier = { | |
1590 | .notifier_call = ndisc_netdev_event, | |
1591 | }; | |
1592 | ||
1593 | #ifdef CONFIG_SYSCTL | |
1594 | static void ndisc_warn_deprecated_sysctl(struct ctl_table *ctl, | |
1595 | const char *func, const char *dev_name) | |
1596 | { | |
1597 | static char warncomm[TASK_COMM_LEN]; | |
1598 | static int warned; | |
1599 | if (strcmp(warncomm, current->comm) && warned < 5) { | |
1600 | strcpy(warncomm, current->comm); | |
f3213831 | 1601 | 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 |
1602 | warncomm, func, |
1603 | dev_name, ctl->procname, | |
1604 | dev_name, ctl->procname); | |
1605 | warned++; | |
1606 | } | |
1607 | } | |
1608 | ||
8d65af78 | 1609 | int ndisc_ifinfo_sysctl_change(struct ctl_table *ctl, int write, void __user *buffer, size_t *lenp, loff_t *ppos) |
1da177e4 LT |
1610 | { |
1611 | struct net_device *dev = ctl->extra1; | |
1612 | struct inet6_dev *idev; | |
1613 | int ret; | |
1614 | ||
d12af679 EB |
1615 | if ((strcmp(ctl->procname, "retrans_time") == 0) || |
1616 | (strcmp(ctl->procname, "base_reachable_time") == 0)) | |
1da177e4 LT |
1617 | ndisc_warn_deprecated_sysctl(ctl, "syscall", dev ? dev->name : "default"); |
1618 | ||
d12af679 | 1619 | if (strcmp(ctl->procname, "retrans_time") == 0) |
8d65af78 | 1620 | ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
d12af679 EB |
1621 | |
1622 | else if (strcmp(ctl->procname, "base_reachable_time") == 0) | |
1da177e4 | 1623 | ret = proc_dointvec_jiffies(ctl, write, |
8d65af78 | 1624 | buffer, lenp, ppos); |
d12af679 EB |
1625 | |
1626 | else if ((strcmp(ctl->procname, "retrans_time_ms") == 0) || | |
ad02ac14 | 1627 | (strcmp(ctl->procname, "base_reachable_time_ms") == 0)) |
1da177e4 | 1628 | ret = proc_dointvec_ms_jiffies(ctl, write, |
8d65af78 | 1629 | buffer, lenp, ppos); |
d12af679 | 1630 | else |
1da177e4 | 1631 | ret = -1; |
1da177e4 LT |
1632 | |
1633 | if (write && ret == 0 && dev && (idev = in6_dev_get(dev)) != NULL) { | |
d12af679 | 1634 | if (ctl->data == &idev->nd_parms->base_reachable_time) |
1da177e4 LT |
1635 | idev->nd_parms->reachable_time = neigh_rand_reach_time(idev->nd_parms->base_reachable_time); |
1636 | idev->tstamp = jiffies; | |
1637 | inet6_ifinfo_notify(RTM_NEWLINK, idev); | |
1638 | in6_dev_put(idev); | |
1639 | } | |
1640 | return ret; | |
1641 | } | |
1642 | ||
1da177e4 LT |
1643 | |
1644 | #endif | |
1645 | ||
2c8c1e72 | 1646 | static int __net_init ndisc_net_init(struct net *net) |
1da177e4 LT |
1647 | { |
1648 | struct ipv6_pinfo *np; | |
1649 | struct sock *sk; | |
1ab1457c | 1650 | int err; |
1da177e4 | 1651 | |
1ed8516f DL |
1652 | err = inet_ctl_sock_create(&sk, PF_INET6, |
1653 | SOCK_RAW, IPPROTO_ICMPV6, net); | |
1da177e4 | 1654 | if (err < 0) { |
675418d5 JP |
1655 | ND_PRINTK(0, err, |
1656 | "NDISC: Failed to initialize the control socket (err %d)\n", | |
1657 | err); | |
1da177e4 LT |
1658 | return err; |
1659 | } | |
1660 | ||
1ed8516f | 1661 | net->ipv6.ndisc_sk = sk; |
1762f7e8 | 1662 | |
1da177e4 | 1663 | np = inet6_sk(sk); |
1da177e4 LT |
1664 | np->hop_limit = 255; |
1665 | /* Do not loopback ndisc messages */ | |
1666 | np->mc_loop = 0; | |
1da177e4 | 1667 | |
1762f7e8 DL |
1668 | return 0; |
1669 | } | |
1670 | ||
2c8c1e72 | 1671 | static void __net_exit ndisc_net_exit(struct net *net) |
1762f7e8 | 1672 | { |
1ed8516f | 1673 | inet_ctl_sock_destroy(net->ipv6.ndisc_sk); |
1762f7e8 DL |
1674 | } |
1675 | ||
1676 | static struct pernet_operations ndisc_net_ops = { | |
1677 | .init = ndisc_net_init, | |
1678 | .exit = ndisc_net_exit, | |
1679 | }; | |
1680 | ||
1681 | int __init ndisc_init(void) | |
1682 | { | |
1683 | int err; | |
1684 | ||
1685 | err = register_pernet_subsys(&ndisc_net_ops); | |
1686 | if (err) | |
1687 | return err; | |
1ab1457c YH |
1688 | /* |
1689 | * Initialize the neighbour table | |
1690 | */ | |
1da177e4 LT |
1691 | neigh_table_init(&nd_tbl); |
1692 | ||
1693 | #ifdef CONFIG_SYSCTL | |
54716e3b | 1694 | err = neigh_sysctl_register(NULL, &nd_tbl.parms, "ipv6", |
f8572d8f | 1695 | &ndisc_ifinfo_sysctl_change); |
1762f7e8 DL |
1696 | if (err) |
1697 | goto out_unregister_pernet; | |
1da177e4 | 1698 | #endif |
1762f7e8 DL |
1699 | err = register_netdevice_notifier(&ndisc_netdev_notifier); |
1700 | if (err) | |
1701 | goto out_unregister_sysctl; | |
1702 | out: | |
1703 | return err; | |
1da177e4 | 1704 | |
1762f7e8 DL |
1705 | out_unregister_sysctl: |
1706 | #ifdef CONFIG_SYSCTL | |
1707 | neigh_sysctl_unregister(&nd_tbl.parms); | |
1708 | out_unregister_pernet: | |
1709 | #endif | |
1710 | unregister_pernet_subsys(&ndisc_net_ops); | |
1711 | goto out; | |
1da177e4 LT |
1712 | } |
1713 | ||
1714 | void ndisc_cleanup(void) | |
1715 | { | |
36f73d0c | 1716 | unregister_netdevice_notifier(&ndisc_netdev_notifier); |
1da177e4 LT |
1717 | #ifdef CONFIG_SYSCTL |
1718 | neigh_sysctl_unregister(&nd_tbl.parms); | |
1719 | #endif | |
1720 | neigh_table_clear(&nd_tbl); | |
1762f7e8 | 1721 | unregister_pernet_subsys(&ndisc_net_ops); |
1da177e4 | 1722 | } |