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; | |
538 | struct in6_addr mcaddr; | |
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) { | |
546 | addrconf_addr_solict_mult(&ifa->addr, &mcaddr); | |
547 | ndisc_send_na(dev, NULL, &mcaddr, &ifa->addr, | |
548 | /*router=*/ !!idev->cnf.forwarding, | |
549 | /*solicited=*/ false, /*override=*/ true, | |
550 | /*inc_opt=*/ true); | |
551 | } | |
552 | read_unlock_bh(&idev->lock); | |
553 | ||
554 | in6_dev_put(idev); | |
555 | } | |
556 | ||
1da177e4 | 557 | void ndisc_send_ns(struct net_device *dev, struct neighbour *neigh, |
9acd9f3a YH |
558 | const struct in6_addr *solicit, |
559 | const struct in6_addr *daddr, const struct in6_addr *saddr) | |
1da177e4 | 560 | { |
1da177e4 | 561 | struct in6_addr addr_buf; |
e1ec7842 YH |
562 | struct icmp6hdr icmp6h = { |
563 | .icmp6_type = NDISC_NEIGHBOUR_SOLICITATION, | |
564 | }; | |
1da177e4 LT |
565 | |
566 | if (saddr == NULL) { | |
95c385b4 NH |
567 | if (ipv6_get_lladdr(dev, &addr_buf, |
568 | (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC))) | |
1da177e4 LT |
569 | return; |
570 | saddr = &addr_buf; | |
571 | } | |
572 | ||
e1ec7842 YH |
573 | __ndisc_send(dev, neigh, daddr, saddr, |
574 | &icmp6h, solicit, | |
14878f75 | 575 | !ipv6_addr_any(saddr) ? ND_OPT_SOURCE_LL_ADDR : 0); |
1da177e4 LT |
576 | } |
577 | ||
9acd9f3a YH |
578 | void ndisc_send_rs(struct net_device *dev, const struct in6_addr *saddr, |
579 | const struct in6_addr *daddr) | |
1da177e4 | 580 | { |
e1ec7842 YH |
581 | struct icmp6hdr icmp6h = { |
582 | .icmp6_type = NDISC_ROUTER_SOLICITATION, | |
583 | }; | |
95c385b4 | 584 | int send_sllao = dev->addr_len; |
95c385b4 NH |
585 | |
586 | #ifdef CONFIG_IPV6_OPTIMISTIC_DAD | |
587 | /* | |
588 | * According to section 2.2 of RFC 4429, we must not | |
589 | * send router solicitations with a sllao from | |
590 | * optimistic addresses, but we may send the solicitation | |
591 | * if we don't include the sllao. So here we check | |
592 | * if our address is optimistic, and if so, we | |
bea85195 | 593 | * suppress the inclusion of the sllao. |
95c385b4 NH |
594 | */ |
595 | if (send_sllao) { | |
c346dca1 | 596 | struct inet6_ifaddr *ifp = ipv6_get_ifaddr(dev_net(dev), saddr, |
1cab3da6 | 597 | dev, 1); |
95c385b4 NH |
598 | if (ifp) { |
599 | if (ifp->flags & IFA_F_OPTIMISTIC) { | |
ca043569 | 600 | send_sllao = 0; |
95c385b4 | 601 | } |
ca043569 | 602 | in6_ifa_put(ifp); |
95c385b4 NH |
603 | } else { |
604 | send_sllao = 0; | |
605 | } | |
606 | } | |
607 | #endif | |
e1ec7842 YH |
608 | __ndisc_send(dev, NULL, daddr, saddr, |
609 | &icmp6h, NULL, | |
14878f75 | 610 | send_sllao ? ND_OPT_SOURCE_LL_ADDR : 0); |
1da177e4 | 611 | } |
1ab1457c | 612 | |
1da177e4 LT |
613 | |
614 | static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb) | |
615 | { | |
616 | /* | |
617 | * "The sender MUST return an ICMP | |
618 | * destination unreachable" | |
619 | */ | |
620 | dst_link_failure(skb); | |
621 | kfree_skb(skb); | |
622 | } | |
623 | ||
624 | /* Called with locked neigh: either read or both */ | |
625 | ||
626 | static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb) | |
627 | { | |
628 | struct in6_addr *saddr = NULL; | |
629 | struct in6_addr mcaddr; | |
630 | struct net_device *dev = neigh->dev; | |
631 | struct in6_addr *target = (struct in6_addr *)&neigh->primary_key; | |
632 | int probes = atomic_read(&neigh->probes); | |
633 | ||
c346dca1 | 634 | if (skb && ipv6_chk_addr(dev_net(dev), &ipv6_hdr(skb)->saddr, dev, 1)) |
0660e03f | 635 | saddr = &ipv6_hdr(skb)->saddr; |
1da177e4 LT |
636 | |
637 | if ((probes -= neigh->parms->ucast_probes) < 0) { | |
638 | if (!(neigh->nud_state & NUD_VALID)) { | |
675418d5 JP |
639 | ND_PRINTK(1, dbg, |
640 | "%s: trying to ucast probe in NUD_INVALID: %pI6\n", | |
641 | __func__, target); | |
1da177e4 LT |
642 | } |
643 | ndisc_send_ns(dev, neigh, target, target, saddr); | |
644 | } else if ((probes -= neigh->parms->app_probes) < 0) { | |
645 | #ifdef CONFIG_ARPD | |
646 | neigh_app_ns(neigh); | |
647 | #endif | |
648 | } else { | |
649 | addrconf_addr_solict_mult(target, &mcaddr); | |
650 | ndisc_send_ns(dev, NULL, target, &mcaddr, saddr); | |
651 | } | |
652 | } | |
653 | ||
0736ffc0 YH |
654 | static int pndisc_is_router(const void *pkey, |
655 | struct net_device *dev) | |
fa86d322 PE |
656 | { |
657 | struct pneigh_entry *n; | |
0736ffc0 | 658 | int ret = -1; |
fa86d322 PE |
659 | |
660 | read_lock_bh(&nd_tbl.lock); | |
0736ffc0 YH |
661 | n = __pneigh_lookup(&nd_tbl, dev_net(dev), pkey, dev); |
662 | if (n) | |
663 | ret = !!(n->flags & NTF_ROUTER); | |
fa86d322 PE |
664 | read_unlock_bh(&nd_tbl.lock); |
665 | ||
0736ffc0 | 666 | return ret; |
fa86d322 PE |
667 | } |
668 | ||
1da177e4 LT |
669 | static void ndisc_recv_ns(struct sk_buff *skb) |
670 | { | |
9c70220b | 671 | struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb); |
b71d1d42 ED |
672 | const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; |
673 | const struct in6_addr *daddr = &ipv6_hdr(skb)->daddr; | |
1da177e4 | 674 | u8 *lladdr = NULL; |
27a884dc ACM |
675 | u32 ndoptlen = skb->tail - (skb->transport_header + |
676 | offsetof(struct nd_msg, opt)); | |
1da177e4 LT |
677 | struct ndisc_options ndopts; |
678 | struct net_device *dev = skb->dev; | |
679 | struct inet6_ifaddr *ifp; | |
680 | struct inet6_dev *idev = NULL; | |
681 | struct neighbour *neigh; | |
682 | int dad = ipv6_addr_any(saddr); | |
a50feda5 | 683 | bool inc; |
0736ffc0 | 684 | int is_router = -1; |
1da177e4 LT |
685 | |
686 | if (ipv6_addr_is_multicast(&msg->target)) { | |
675418d5 | 687 | ND_PRINTK(2, warn, "NS: multicast target address\n"); |
1da177e4 LT |
688 | return; |
689 | } | |
690 | ||
691 | /* | |
692 | * RFC2461 7.1.1: | |
693 | * DAD has to be destined for solicited node multicast address. | |
694 | */ | |
695 | if (dad && | |
696 | !(daddr->s6_addr32[0] == htonl(0xff020000) && | |
697 | daddr->s6_addr32[1] == htonl(0x00000000) && | |
698 | daddr->s6_addr32[2] == htonl(0x00000001) && | |
699 | daddr->s6_addr [12] == 0xff )) { | |
675418d5 | 700 | ND_PRINTK(2, warn, "NS: bad DAD packet (wrong destination)\n"); |
1da177e4 LT |
701 | return; |
702 | } | |
703 | ||
704 | if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) { | |
675418d5 | 705 | ND_PRINTK(2, warn, "NS: invalid ND options\n"); |
1da177e4 LT |
706 | return; |
707 | } | |
708 | ||
709 | if (ndopts.nd_opts_src_lladdr) { | |
710 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, dev); | |
711 | if (!lladdr) { | |
675418d5 JP |
712 | ND_PRINTK(2, warn, |
713 | "NS: invalid link-layer address length\n"); | |
1da177e4 LT |
714 | return; |
715 | } | |
716 | ||
717 | /* RFC2461 7.1.1: | |
1ab1457c YH |
718 | * If the IP source address is the unspecified address, |
719 | * there MUST NOT be source link-layer address option | |
1da177e4 LT |
720 | * in the message. |
721 | */ | |
722 | if (dad) { | |
675418d5 JP |
723 | ND_PRINTK(2, warn, |
724 | "NS: bad DAD packet (link-layer address option)\n"); | |
1da177e4 LT |
725 | return; |
726 | } | |
727 | } | |
728 | ||
729 | inc = ipv6_addr_is_multicast(daddr); | |
730 | ||
c346dca1 | 731 | ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1); |
a18bc695 | 732 | if (ifp) { |
95c385b4 NH |
733 | |
734 | if (ifp->flags & (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC)) { | |
735 | if (dad) { | |
95c385b4 NH |
736 | /* |
737 | * We are colliding with another node | |
738 | * who is doing DAD | |
739 | * so fail our DAD process | |
740 | */ | |
741 | addrconf_dad_failure(ifp); | |
9e3be4b3 | 742 | return; |
95c385b4 NH |
743 | } else { |
744 | /* | |
745 | * This is not a dad solicitation. | |
746 | * If we are an optimistic node, | |
747 | * we should respond. | |
748 | * Otherwise, we should ignore it. | |
749 | */ | |
750 | if (!(ifp->flags & IFA_F_OPTIMISTIC)) | |
1da177e4 | 751 | goto out; |
1da177e4 | 752 | } |
1da177e4 LT |
753 | } |
754 | ||
755 | idev = ifp->idev; | |
756 | } else { | |
53b7997f YH |
757 | struct net *net = dev_net(dev); |
758 | ||
1da177e4 LT |
759 | idev = in6_dev_get(dev); |
760 | if (!idev) { | |
761 | /* XXX: count this drop? */ | |
762 | return; | |
763 | } | |
764 | ||
53b7997f | 765 | if (ipv6_chk_acast_addr(net, dev, &msg->target) || |
1ab1457c | 766 | (idev->cnf.forwarding && |
53b7997f | 767 | (net->ipv6.devconf_all->proxy_ndp || idev->cnf.proxy_ndp) && |
0736ffc0 | 768 | (is_router = pndisc_is_router(&msg->target, dev)) >= 0)) { |
a61bbcf2 | 769 | if (!(NEIGH_CB(skb)->flags & LOCALLY_ENQUEUED) && |
1da177e4 LT |
770 | skb->pkt_type != PACKET_HOST && |
771 | inc != 0 && | |
772 | idev->nd_parms->proxy_delay != 0) { | |
773 | /* | |
774 | * for anycast or proxy, | |
1ab1457c YH |
775 | * sender should delay its response |
776 | * by a random time between 0 and | |
1da177e4 LT |
777 | * MAX_ANYCAST_DELAY_TIME seconds. |
778 | * (RFC2461) -- yoshfuji | |
779 | */ | |
780 | struct sk_buff *n = skb_clone(skb, GFP_ATOMIC); | |
781 | if (n) | |
782 | pneigh_enqueue(&nd_tbl, idev->nd_parms, n); | |
783 | goto out; | |
784 | } | |
785 | } else | |
786 | goto out; | |
787 | } | |
788 | ||
0736ffc0 YH |
789 | if (is_router < 0) |
790 | is_router = !!idev->cnf.forwarding; | |
62dd9318 | 791 | |
1da177e4 | 792 | if (dad) { |
f3ee4010 | 793 | ndisc_send_na(dev, NULL, &in6addr_linklocal_allnodes, &msg->target, |
62dd9318 | 794 | is_router, 0, (ifp != NULL), 1); |
1da177e4 LT |
795 | goto out; |
796 | } | |
797 | ||
798 | if (inc) | |
799 | NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_mcast); | |
800 | else | |
801 | NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_ucast); | |
802 | ||
1ab1457c | 803 | /* |
1da177e4 LT |
804 | * update / create cache entry |
805 | * for the source address | |
806 | */ | |
807 | neigh = __neigh_lookup(&nd_tbl, saddr, dev, | |
808 | !inc || lladdr || !dev->addr_len); | |
809 | if (neigh) | |
1ab1457c | 810 | neigh_update(neigh, lladdr, NUD_STALE, |
1da177e4 LT |
811 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
812 | NEIGH_UPDATE_F_OVERRIDE); | |
3b04ddde | 813 | if (neigh || !dev->header_ops) { |
1da177e4 | 814 | ndisc_send_na(dev, neigh, saddr, &msg->target, |
62dd9318 | 815 | is_router, |
1da177e4 LT |
816 | 1, (ifp != NULL && inc), inc); |
817 | if (neigh) | |
818 | neigh_release(neigh); | |
819 | } | |
820 | ||
821 | out: | |
822 | if (ifp) | |
823 | in6_ifa_put(ifp); | |
824 | else | |
825 | in6_dev_put(idev); | |
1da177e4 LT |
826 | } |
827 | ||
828 | static void ndisc_recv_na(struct sk_buff *skb) | |
829 | { | |
9c70220b | 830 | struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb); |
b71d1d42 ED |
831 | const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; |
832 | const struct in6_addr *daddr = &ipv6_hdr(skb)->daddr; | |
1da177e4 | 833 | u8 *lladdr = NULL; |
27a884dc ACM |
834 | u32 ndoptlen = skb->tail - (skb->transport_header + |
835 | offsetof(struct nd_msg, opt)); | |
1da177e4 LT |
836 | struct ndisc_options ndopts; |
837 | struct net_device *dev = skb->dev; | |
838 | struct inet6_ifaddr *ifp; | |
839 | struct neighbour *neigh; | |
840 | ||
841 | if (skb->len < sizeof(struct nd_msg)) { | |
675418d5 | 842 | ND_PRINTK(2, warn, "NA: packet too short\n"); |
1da177e4 LT |
843 | return; |
844 | } | |
845 | ||
846 | if (ipv6_addr_is_multicast(&msg->target)) { | |
675418d5 | 847 | ND_PRINTK(2, warn, "NA: target address is multicast\n"); |
1da177e4 LT |
848 | return; |
849 | } | |
850 | ||
851 | if (ipv6_addr_is_multicast(daddr) && | |
852 | msg->icmph.icmp6_solicited) { | |
675418d5 | 853 | ND_PRINTK(2, warn, "NA: solicited NA is multicasted\n"); |
1da177e4 LT |
854 | return; |
855 | } | |
1ab1457c | 856 | |
1da177e4 | 857 | if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) { |
675418d5 | 858 | ND_PRINTK(2, warn, "NS: invalid ND option\n"); |
1da177e4 LT |
859 | return; |
860 | } | |
861 | if (ndopts.nd_opts_tgt_lladdr) { | |
862 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, dev); | |
863 | if (!lladdr) { | |
675418d5 JP |
864 | ND_PRINTK(2, warn, |
865 | "NA: invalid link-layer address length\n"); | |
1da177e4 LT |
866 | return; |
867 | } | |
868 | } | |
c346dca1 | 869 | ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1); |
a18bc695 | 870 | if (ifp) { |
bd015928 DW |
871 | if (skb->pkt_type != PACKET_LOOPBACK |
872 | && (ifp->flags & IFA_F_TENTATIVE)) { | |
873 | addrconf_dad_failure(ifp); | |
874 | return; | |
1da177e4 LT |
875 | } |
876 | /* What should we make now? The advertisement | |
877 | is invalid, but ndisc specs say nothing | |
878 | about it. It could be misconfiguration, or | |
879 | an smart proxy agent tries to help us :-) | |
24fc7b86 JS |
880 | |
881 | We should not print the error if NA has been | |
882 | received from loopback - it is just our own | |
883 | unsolicited advertisement. | |
1da177e4 | 884 | */ |
24fc7b86 | 885 | if (skb->pkt_type != PACKET_LOOPBACK) |
675418d5 JP |
886 | ND_PRINTK(1, warn, |
887 | "NA: someone advertises our address %pI6 on %s!\n", | |
888 | &ifp->addr, ifp->idev->dev->name); | |
1da177e4 LT |
889 | in6_ifa_put(ifp); |
890 | return; | |
891 | } | |
892 | neigh = neigh_lookup(&nd_tbl, &msg->target, dev); | |
893 | ||
894 | if (neigh) { | |
895 | u8 old_flags = neigh->flags; | |
53b7997f | 896 | struct net *net = dev_net(dev); |
1da177e4 LT |
897 | |
898 | if (neigh->nud_state & NUD_FAILED) | |
899 | goto out; | |
900 | ||
5f3e6e9e VN |
901 | /* |
902 | * Don't update the neighbor cache entry on a proxy NA from | |
903 | * ourselves because either the proxied node is off link or it | |
904 | * has already sent a NA to us. | |
905 | */ | |
906 | if (lladdr && !memcmp(lladdr, dev->dev_addr, dev->addr_len) && | |
53b7997f YH |
907 | net->ipv6.devconf_all->forwarding && net->ipv6.devconf_all->proxy_ndp && |
908 | pneigh_lookup(&nd_tbl, net, &msg->target, dev, 0)) { | |
fbea49e1 | 909 | /* XXX: idev->cnf.prixy_ndp */ |
5f3e6e9e | 910 | goto out; |
fbea49e1 | 911 | } |
5f3e6e9e | 912 | |
1da177e4 LT |
913 | neigh_update(neigh, lladdr, |
914 | msg->icmph.icmp6_solicited ? NUD_REACHABLE : NUD_STALE, | |
915 | NEIGH_UPDATE_F_WEAK_OVERRIDE| | |
916 | (msg->icmph.icmp6_override ? NEIGH_UPDATE_F_OVERRIDE : 0)| | |
917 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
918 | (msg->icmph.icmp6_router ? NEIGH_UPDATE_F_ISROUTER : 0)); | |
919 | ||
920 | if ((old_flags & ~neigh->flags) & NTF_ROUTER) { | |
921 | /* | |
922 | * Change: router to host | |
923 | */ | |
924 | struct rt6_info *rt; | |
925 | rt = rt6_get_dflt_router(saddr, dev); | |
926 | if (rt) | |
e0a1ad73 | 927 | ip6_del_rt(rt); |
1da177e4 LT |
928 | } |
929 | ||
930 | out: | |
931 | neigh_release(neigh); | |
932 | } | |
933 | } | |
934 | ||
935 | static void ndisc_recv_rs(struct sk_buff *skb) | |
936 | { | |
9c70220b | 937 | struct rs_msg *rs_msg = (struct rs_msg *)skb_transport_header(skb); |
1da177e4 LT |
938 | unsigned long ndoptlen = skb->len - sizeof(*rs_msg); |
939 | struct neighbour *neigh; | |
940 | struct inet6_dev *idev; | |
b71d1d42 | 941 | const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; |
1da177e4 LT |
942 | struct ndisc_options ndopts; |
943 | u8 *lladdr = NULL; | |
944 | ||
945 | if (skb->len < sizeof(*rs_msg)) | |
946 | return; | |
947 | ||
cfdf7647 | 948 | idev = __in6_dev_get(skb->dev); |
1da177e4 | 949 | if (!idev) { |
675418d5 | 950 | ND_PRINTK(1, err, "RS: can't find in6 device\n"); |
1da177e4 LT |
951 | return; |
952 | } | |
953 | ||
954 | /* Don't accept RS if we're not in router mode */ | |
955 | if (!idev->cnf.forwarding) | |
956 | goto out; | |
957 | ||
958 | /* | |
959 | * Don't update NCE if src = ::; | |
960 | * this implies that the source node has no ip address assigned yet. | |
961 | */ | |
962 | if (ipv6_addr_any(saddr)) | |
963 | goto out; | |
964 | ||
965 | /* Parse ND options */ | |
966 | if (!ndisc_parse_options(rs_msg->opt, ndoptlen, &ndopts)) { | |
675418d5 | 967 | ND_PRINTK(2, notice, "NS: invalid ND option, ignored\n"); |
1da177e4 LT |
968 | goto out; |
969 | } | |
970 | ||
971 | if (ndopts.nd_opts_src_lladdr) { | |
972 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, | |
973 | skb->dev); | |
974 | if (!lladdr) | |
975 | goto out; | |
976 | } | |
977 | ||
978 | neigh = __neigh_lookup(&nd_tbl, saddr, skb->dev, 1); | |
979 | if (neigh) { | |
980 | neigh_update(neigh, lladdr, NUD_STALE, | |
981 | NEIGH_UPDATE_F_WEAK_OVERRIDE| | |
982 | NEIGH_UPDATE_F_OVERRIDE| | |
983 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER); | |
984 | neigh_release(neigh); | |
985 | } | |
986 | out: | |
cfdf7647 | 987 | return; |
1da177e4 LT |
988 | } |
989 | ||
31910575 PY |
990 | static void ndisc_ra_useropt(struct sk_buff *ra, struct nd_opt_hdr *opt) |
991 | { | |
992 | struct icmp6hdr *icmp6h = (struct icmp6hdr *)skb_transport_header(ra); | |
993 | struct sk_buff *skb; | |
994 | struct nlmsghdr *nlh; | |
995 | struct nduseroptmsg *ndmsg; | |
c346dca1 | 996 | struct net *net = dev_net(ra->dev); |
31910575 PY |
997 | int err; |
998 | int base_size = NLMSG_ALIGN(sizeof(struct nduseroptmsg) | |
999 | + (opt->nd_opt_len << 3)); | |
1000 | size_t msg_size = base_size + nla_total_size(sizeof(struct in6_addr)); | |
1001 | ||
1002 | skb = nlmsg_new(msg_size, GFP_ATOMIC); | |
1003 | if (skb == NULL) { | |
1004 | err = -ENOBUFS; | |
1005 | goto errout; | |
1006 | } | |
1007 | ||
1008 | nlh = nlmsg_put(skb, 0, 0, RTM_NEWNDUSEROPT, base_size, 0); | |
1009 | if (nlh == NULL) { | |
1010 | goto nla_put_failure; | |
1011 | } | |
1012 | ||
1013 | ndmsg = nlmsg_data(nlh); | |
1014 | ndmsg->nduseropt_family = AF_INET6; | |
dbb2ed24 | 1015 | ndmsg->nduseropt_ifindex = ra->dev->ifindex; |
31910575 PY |
1016 | ndmsg->nduseropt_icmp_type = icmp6h->icmp6_type; |
1017 | ndmsg->nduseropt_icmp_code = icmp6h->icmp6_code; | |
1018 | ndmsg->nduseropt_opts_len = opt->nd_opt_len << 3; | |
1019 | ||
1020 | memcpy(ndmsg + 1, opt, opt->nd_opt_len << 3); | |
1021 | ||
c78679e8 DM |
1022 | if (nla_put(skb, NDUSEROPT_SRCADDR, sizeof(struct in6_addr), |
1023 | &ipv6_hdr(ra)->saddr)) | |
1024 | goto nla_put_failure; | |
31910575 PY |
1025 | nlmsg_end(skb, nlh); |
1026 | ||
1ce85fe4 | 1027 | rtnl_notify(skb, net, 0, RTNLGRP_ND_USEROPT, NULL, GFP_ATOMIC); |
31910575 PY |
1028 | return; |
1029 | ||
1030 | nla_put_failure: | |
1031 | nlmsg_free(skb); | |
1032 | err = -EMSGSIZE; | |
1033 | errout: | |
a18bc695 | 1034 | rtnl_set_sk_err(net, RTNLGRP_ND_USEROPT, err); |
31910575 PY |
1035 | } |
1036 | ||
65e9b62d TG |
1037 | static inline int accept_ra(struct inet6_dev *in6_dev) |
1038 | { | |
1039 | /* | |
1040 | * If forwarding is enabled, RA are not accepted unless the special | |
1041 | * hybrid mode (accept_ra=2) is enabled. | |
1042 | */ | |
1043 | if (in6_dev->cnf.forwarding && in6_dev->cnf.accept_ra < 2) | |
1044 | return 0; | |
1045 | ||
1046 | return in6_dev->cnf.accept_ra; | |
1047 | } | |
1048 | ||
1da177e4 LT |
1049 | static void ndisc_router_discovery(struct sk_buff *skb) |
1050 | { | |
9c70220b | 1051 | struct ra_msg *ra_msg = (struct ra_msg *)skb_transport_header(skb); |
1da177e4 LT |
1052 | struct neighbour *neigh = NULL; |
1053 | struct inet6_dev *in6_dev; | |
65f5c7c1 | 1054 | struct rt6_info *rt = NULL; |
1da177e4 LT |
1055 | int lifetime; |
1056 | struct ndisc_options ndopts; | |
1057 | int optlen; | |
ebacaaa0 | 1058 | unsigned int pref = 0; |
1da177e4 LT |
1059 | |
1060 | __u8 * opt = (__u8 *)(ra_msg + 1); | |
1061 | ||
27a884dc | 1062 | optlen = (skb->tail - skb->transport_header) - sizeof(struct ra_msg); |
1da177e4 | 1063 | |
0660e03f | 1064 | if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) { |
675418d5 | 1065 | ND_PRINTK(2, warn, "RA: source address is not link-local\n"); |
1da177e4 LT |
1066 | return; |
1067 | } | |
1068 | if (optlen < 0) { | |
675418d5 | 1069 | ND_PRINTK(2, warn, "RA: packet too short\n"); |
1da177e4 LT |
1070 | return; |
1071 | } | |
1072 | ||
de357cc0 | 1073 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 | 1074 | if (skb->ndisc_nodetype == NDISC_NODETYPE_HOST) { |
675418d5 | 1075 | ND_PRINTK(2, warn, "RA: from host or unauthorized router\n"); |
fadf6bf0 TF |
1076 | return; |
1077 | } | |
de357cc0 | 1078 | #endif |
fadf6bf0 | 1079 | |
1da177e4 LT |
1080 | /* |
1081 | * set the RA_RECV flag in the interface | |
1082 | */ | |
1083 | ||
cfdf7647 | 1084 | in6_dev = __in6_dev_get(skb->dev); |
1da177e4 | 1085 | if (in6_dev == NULL) { |
675418d5 JP |
1086 | ND_PRINTK(0, err, "RA: can't find inet6 device for %s\n", |
1087 | skb->dev->name); | |
1da177e4 LT |
1088 | return; |
1089 | } | |
1da177e4 LT |
1090 | |
1091 | if (!ndisc_parse_options(opt, optlen, &ndopts)) { | |
675418d5 | 1092 | ND_PRINTK(2, warn, "RA: invalid ND options\n"); |
1da177e4 LT |
1093 | return; |
1094 | } | |
1095 | ||
65e9b62d | 1096 | if (!accept_ra(in6_dev)) |
31ce8c71 DW |
1097 | goto skip_linkparms; |
1098 | ||
de357cc0 | 1099 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 TF |
1100 | /* skip link-specific parameters from interior routers */ |
1101 | if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT) | |
1102 | goto skip_linkparms; | |
de357cc0 | 1103 | #endif |
fadf6bf0 | 1104 | |
1da177e4 LT |
1105 | if (in6_dev->if_flags & IF_RS_SENT) { |
1106 | /* | |
1107 | * flag that an RA was received after an RS was sent | |
1108 | * out on this interface. | |
1109 | */ | |
1110 | in6_dev->if_flags |= IF_RA_RCVD; | |
1111 | } | |
1112 | ||
1113 | /* | |
1114 | * Remember the managed/otherconf flags from most recently | |
1115 | * received RA message (RFC 2462) -- yoshfuji | |
1116 | */ | |
1117 | in6_dev->if_flags = (in6_dev->if_flags & ~(IF_RA_MANAGED | | |
1118 | IF_RA_OTHERCONF)) | | |
1119 | (ra_msg->icmph.icmp6_addrconf_managed ? | |
1120 | IF_RA_MANAGED : 0) | | |
1121 | (ra_msg->icmph.icmp6_addrconf_other ? | |
1122 | IF_RA_OTHERCONF : 0); | |
1123 | ||
65f5c7c1 YH |
1124 | if (!in6_dev->cnf.accept_ra_defrtr) |
1125 | goto skip_defrtr; | |
1126 | ||
9f56220f AH |
1127 | if (ipv6_chk_addr(dev_net(in6_dev->dev), &ipv6_hdr(skb)->saddr, NULL, 0)) |
1128 | goto skip_defrtr; | |
1129 | ||
1da177e4 LT |
1130 | lifetime = ntohs(ra_msg->icmph.icmp6_rt_lifetime); |
1131 | ||
ebacaaa0 YH |
1132 | #ifdef CONFIG_IPV6_ROUTER_PREF |
1133 | pref = ra_msg->icmph.icmp6_router_pref; | |
1134 | /* 10b is handled as if it were 00b (medium) */ | |
930d6ff2 | 1135 | if (pref == ICMPV6_ROUTER_PREF_INVALID || |
6d5b78cd | 1136 | !in6_dev->cnf.accept_ra_rtr_pref) |
ebacaaa0 YH |
1137 | pref = ICMPV6_ROUTER_PREF_MEDIUM; |
1138 | #endif | |
1139 | ||
0660e03f | 1140 | rt = rt6_get_dflt_router(&ipv6_hdr(skb)->saddr, skb->dev); |
1da177e4 | 1141 | |
eb857186 DM |
1142 | if (rt) { |
1143 | neigh = dst_neigh_lookup(&rt->dst, &ipv6_hdr(skb)->saddr); | |
1144 | if (!neigh) { | |
675418d5 JP |
1145 | ND_PRINTK(0, err, |
1146 | "RA: %s got default router without neighbour\n", | |
1147 | __func__); | |
eb857186 DM |
1148 | dst_release(&rt->dst); |
1149 | return; | |
1150 | } | |
1151 | } | |
1da177e4 | 1152 | if (rt && lifetime == 0) { |
e0a1ad73 | 1153 | ip6_del_rt(rt); |
1da177e4 LT |
1154 | rt = NULL; |
1155 | } | |
1156 | ||
1157 | if (rt == NULL && lifetime) { | |
675418d5 | 1158 | ND_PRINTK(3, dbg, "RA: adding default router\n"); |
1da177e4 | 1159 | |
0660e03f | 1160 | rt = rt6_add_dflt_router(&ipv6_hdr(skb)->saddr, skb->dev, pref); |
1da177e4 | 1161 | if (rt == NULL) { |
675418d5 JP |
1162 | ND_PRINTK(0, err, |
1163 | "RA: %s failed to add default route\n", | |
1164 | __func__); | |
1da177e4 LT |
1165 | return; |
1166 | } | |
1167 | ||
eb857186 | 1168 | neigh = dst_neigh_lookup(&rt->dst, &ipv6_hdr(skb)->saddr); |
1da177e4 | 1169 | if (neigh == NULL) { |
675418d5 JP |
1170 | ND_PRINTK(0, err, |
1171 | "RA: %s got default router without neighbour\n", | |
1172 | __func__); | |
d8d1f30b | 1173 | dst_release(&rt->dst); |
1da177e4 LT |
1174 | return; |
1175 | } | |
1176 | neigh->flags |= NTF_ROUTER; | |
ebacaaa0 | 1177 | } else if (rt) { |
22441cfa | 1178 | rt->rt6i_flags = (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); |
1da177e4 LT |
1179 | } |
1180 | ||
1181 | if (rt) | |
1716a961 | 1182 | rt6_set_expires(rt, jiffies + (HZ * lifetime)); |
1da177e4 LT |
1183 | if (ra_msg->icmph.icmp6_hop_limit) { |
1184 | in6_dev->cnf.hop_limit = ra_msg->icmph.icmp6_hop_limit; | |
1185 | if (rt) | |
defb3519 DM |
1186 | dst_metric_set(&rt->dst, RTAX_HOPLIMIT, |
1187 | ra_msg->icmph.icmp6_hop_limit); | |
1da177e4 LT |
1188 | } |
1189 | ||
65f5c7c1 YH |
1190 | skip_defrtr: |
1191 | ||
1da177e4 LT |
1192 | /* |
1193 | * Update Reachable Time and Retrans Timer | |
1194 | */ | |
1195 | ||
1196 | if (in6_dev->nd_parms) { | |
1197 | unsigned long rtime = ntohl(ra_msg->retrans_timer); | |
1198 | ||
1199 | if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/HZ) { | |
1200 | rtime = (rtime*HZ)/1000; | |
1201 | if (rtime < HZ/10) | |
1202 | rtime = HZ/10; | |
1203 | in6_dev->nd_parms->retrans_time = rtime; | |
1204 | in6_dev->tstamp = jiffies; | |
1205 | inet6_ifinfo_notify(RTM_NEWLINK, in6_dev); | |
1206 | } | |
1207 | ||
1208 | rtime = ntohl(ra_msg->reachable_time); | |
1209 | if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/(3*HZ)) { | |
1210 | rtime = (rtime*HZ)/1000; | |
1211 | ||
1212 | if (rtime < HZ/10) | |
1213 | rtime = HZ/10; | |
1214 | ||
1215 | if (rtime != in6_dev->nd_parms->base_reachable_time) { | |
1216 | in6_dev->nd_parms->base_reachable_time = rtime; | |
1217 | in6_dev->nd_parms->gc_staletime = 3 * rtime; | |
1218 | in6_dev->nd_parms->reachable_time = neigh_rand_reach_time(rtime); | |
1219 | in6_dev->tstamp = jiffies; | |
1220 | inet6_ifinfo_notify(RTM_NEWLINK, in6_dev); | |
1221 | } | |
1222 | } | |
1223 | } | |
1224 | ||
fadf6bf0 TF |
1225 | skip_linkparms: |
1226 | ||
1da177e4 LT |
1227 | /* |
1228 | * Process options. | |
1229 | */ | |
1230 | ||
1231 | if (!neigh) | |
0660e03f | 1232 | neigh = __neigh_lookup(&nd_tbl, &ipv6_hdr(skb)->saddr, |
1da177e4 LT |
1233 | skb->dev, 1); |
1234 | if (neigh) { | |
1235 | u8 *lladdr = NULL; | |
1236 | if (ndopts.nd_opts_src_lladdr) { | |
1237 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, | |
1238 | skb->dev); | |
1239 | if (!lladdr) { | |
675418d5 JP |
1240 | ND_PRINTK(2, warn, |
1241 | "RA: invalid link-layer address length\n"); | |
1da177e4 LT |
1242 | goto out; |
1243 | } | |
1244 | } | |
1245 | neigh_update(neigh, lladdr, NUD_STALE, | |
1246 | NEIGH_UPDATE_F_WEAK_OVERRIDE| | |
1247 | NEIGH_UPDATE_F_OVERRIDE| | |
1248 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
1249 | NEIGH_UPDATE_F_ISROUTER); | |
1250 | } | |
1251 | ||
65e9b62d | 1252 | if (!accept_ra(in6_dev)) |
31ce8c71 DW |
1253 | goto out; |
1254 | ||
70ceb4f5 | 1255 | #ifdef CONFIG_IPV6_ROUTE_INFO |
9f56220f AH |
1256 | if (ipv6_chk_addr(dev_net(in6_dev->dev), &ipv6_hdr(skb)->saddr, NULL, 0)) |
1257 | goto skip_routeinfo; | |
1258 | ||
09c884d4 | 1259 | if (in6_dev->cnf.accept_ra_rtr_pref && ndopts.nd_opts_ri) { |
70ceb4f5 YH |
1260 | struct nd_opt_hdr *p; |
1261 | for (p = ndopts.nd_opts_ri; | |
1262 | p; | |
1263 | p = ndisc_next_option(p, ndopts.nd_opts_ri_end)) { | |
6294e000 YH |
1264 | struct route_info *ri = (struct route_info *)p; |
1265 | #ifdef CONFIG_IPV6_NDISC_NODETYPE | |
1266 | if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT && | |
1267 | ri->prefix_len == 0) | |
1268 | continue; | |
1269 | #endif | |
1270 | if (ri->prefix_len > in6_dev->cnf.accept_ra_rt_info_max_plen) | |
09c884d4 | 1271 | continue; |
70ceb4f5 | 1272 | rt6_route_rcv(skb->dev, (u8*)p, (p->nd_opt_len) << 3, |
0660e03f | 1273 | &ipv6_hdr(skb)->saddr); |
70ceb4f5 YH |
1274 | } |
1275 | } | |
9f56220f AH |
1276 | |
1277 | skip_routeinfo: | |
70ceb4f5 YH |
1278 | #endif |
1279 | ||
de357cc0 | 1280 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 TF |
1281 | /* skip link-specific ndopts from interior routers */ |
1282 | if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT) | |
1283 | goto out; | |
de357cc0 | 1284 | #endif |
fadf6bf0 | 1285 | |
c4fd30eb | 1286 | if (in6_dev->cnf.accept_ra_pinfo && ndopts.nd_opts_pi) { |
1da177e4 LT |
1287 | struct nd_opt_hdr *p; |
1288 | for (p = ndopts.nd_opts_pi; | |
1289 | p; | |
1290 | p = ndisc_next_option(p, ndopts.nd_opts_pi_end)) { | |
e6bff995 NH |
1291 | addrconf_prefix_rcv(skb->dev, (u8 *)p, |
1292 | (p->nd_opt_len) << 3, | |
1293 | ndopts.nd_opts_src_lladdr != NULL); | |
1da177e4 LT |
1294 | } |
1295 | } | |
1296 | ||
1297 | if (ndopts.nd_opts_mtu) { | |
e69a4adc | 1298 | __be32 n; |
1da177e4 LT |
1299 | u32 mtu; |
1300 | ||
e69a4adc AV |
1301 | memcpy(&n, ((u8*)(ndopts.nd_opts_mtu+1))+2, sizeof(mtu)); |
1302 | mtu = ntohl(n); | |
1da177e4 LT |
1303 | |
1304 | if (mtu < IPV6_MIN_MTU || mtu > skb->dev->mtu) { | |
675418d5 | 1305 | ND_PRINTK(2, warn, "RA: invalid mtu: %d\n", mtu); |
1da177e4 LT |
1306 | } else if (in6_dev->cnf.mtu6 != mtu) { |
1307 | in6_dev->cnf.mtu6 = mtu; | |
1308 | ||
1309 | if (rt) | |
defb3519 | 1310 | dst_metric_set(&rt->dst, RTAX_MTU, mtu); |
1da177e4 LT |
1311 | |
1312 | rt6_mtu_change(skb->dev, mtu); | |
1313 | } | |
1314 | } | |
1ab1457c | 1315 | |
31910575 | 1316 | if (ndopts.nd_useropts) { |
61cf46ad YH |
1317 | struct nd_opt_hdr *p; |
1318 | for (p = ndopts.nd_useropts; | |
1319 | p; | |
1320 | p = ndisc_next_useropt(p, ndopts.nd_useropts_end)) { | |
1321 | ndisc_ra_useropt(skb, p); | |
31910575 PY |
1322 | } |
1323 | } | |
1324 | ||
1da177e4 | 1325 | if (ndopts.nd_opts_tgt_lladdr || ndopts.nd_opts_rh) { |
675418d5 | 1326 | ND_PRINTK(2, warn, "RA: invalid RA options\n"); |
1da177e4 LT |
1327 | } |
1328 | out: | |
1329 | if (rt) | |
d8d1f30b | 1330 | dst_release(&rt->dst); |
eb857186 | 1331 | if (neigh) |
1da177e4 | 1332 | neigh_release(neigh); |
1da177e4 LT |
1333 | } |
1334 | ||
1335 | static void ndisc_redirect_rcv(struct sk_buff *skb) | |
1336 | { | |
de357cc0 | 1337 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 TF |
1338 | switch (skb->ndisc_nodetype) { |
1339 | case NDISC_NODETYPE_HOST: | |
1340 | case NDISC_NODETYPE_NODEFAULT: | |
675418d5 JP |
1341 | ND_PRINTK(2, warn, |
1342 | "Redirect: from host or unauthorized router\n"); | |
fadf6bf0 TF |
1343 | return; |
1344 | } | |
de357cc0 | 1345 | #endif |
fadf6bf0 | 1346 | |
0660e03f | 1347 | if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) { |
675418d5 JP |
1348 | ND_PRINTK(2, warn, |
1349 | "Redirect: source address is not link-local\n"); | |
1da177e4 LT |
1350 | return; |
1351 | } | |
1352 | ||
b94f1c09 | 1353 | icmpv6_notify(skb, NDISC_REDIRECT, 0, 0); |
1da177e4 LT |
1354 | } |
1355 | ||
4991969a | 1356 | void ndisc_send_redirect(struct sk_buff *skb, const struct in6_addr *target) |
1da177e4 | 1357 | { |
1762f7e8 | 1358 | struct net_device *dev = skb->dev; |
c346dca1 | 1359 | struct net *net = dev_net(dev); |
1762f7e8 | 1360 | struct sock *sk = net->ipv6.ndisc_sk; |
1da177e4 | 1361 | int len = sizeof(struct icmp6hdr) + 2 * sizeof(struct in6_addr); |
fbfe95a4 | 1362 | struct inet_peer *peer; |
1da177e4 LT |
1363 | struct sk_buff *buff; |
1364 | struct icmp6hdr *icmph; | |
1365 | struct in6_addr saddr_buf; | |
1366 | struct in6_addr *addrp; | |
1da177e4 LT |
1367 | struct rt6_info *rt; |
1368 | struct dst_entry *dst; | |
1369 | struct inet6_dev *idev; | |
4c9483b2 | 1370 | struct flowi6 fl6; |
1da177e4 | 1371 | u8 *opt; |
a7ae1992 | 1372 | int hlen, tlen; |
1da177e4 LT |
1373 | int rd_len; |
1374 | int err; | |
1da177e4 | 1375 | u8 ha_buf[MAX_ADDR_LEN], *ha = NULL; |
1d861aa4 | 1376 | bool ret; |
1da177e4 | 1377 | |
95c385b4 | 1378 | if (ipv6_get_lladdr(dev, &saddr_buf, IFA_F_TENTATIVE)) { |
675418d5 JP |
1379 | ND_PRINTK(2, warn, "Redirect: no link-local address on %s\n", |
1380 | dev->name); | |
1ab1457c YH |
1381 | return; |
1382 | } | |
1da177e4 | 1383 | |
0660e03f | 1384 | if (!ipv6_addr_equal(&ipv6_hdr(skb)->daddr, target) && |
bf0b48df | 1385 | ipv6_addr_type(target) != (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) { |
675418d5 JP |
1386 | ND_PRINTK(2, warn, |
1387 | "Redirect: target address is not link-local unicast\n"); | |
29556526 LY |
1388 | return; |
1389 | } | |
1390 | ||
4c9483b2 | 1391 | icmpv6_flow_init(sk, &fl6, NDISC_REDIRECT, |
95e41e93 | 1392 | &saddr_buf, &ipv6_hdr(skb)->saddr, dev->ifindex); |
1da177e4 | 1393 | |
4c9483b2 | 1394 | dst = ip6_route_output(net, NULL, &fl6); |
5095d64d RL |
1395 | if (dst->error) { |
1396 | dst_release(dst); | |
1da177e4 | 1397 | return; |
5095d64d | 1398 | } |
4c9483b2 | 1399 | dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), NULL, 0); |
452edd59 | 1400 | if (IS_ERR(dst)) |
1da177e4 | 1401 | return; |
1da177e4 LT |
1402 | |
1403 | rt = (struct rt6_info *) dst; | |
1404 | ||
1405 | if (rt->rt6i_flags & RTF_GATEWAY) { | |
675418d5 JP |
1406 | ND_PRINTK(2, warn, |
1407 | "Redirect: destination is not a neighbour\n"); | |
d73f0801 | 1408 | goto release; |
1da177e4 | 1409 | } |
1d861aa4 DM |
1410 | peer = inet_getpeer_v6(net->ipv6.peers, &rt->rt6i_dst.addr, 1); |
1411 | ret = inet_peer_xrlim_allow(peer, 1*HZ); | |
1412 | if (peer) | |
1413 | inet_putpeer(peer); | |
1414 | if (!ret) | |
d73f0801 | 1415 | goto release; |
1da177e4 LT |
1416 | |
1417 | if (dev->addr_len) { | |
4991969a DM |
1418 | struct neighbour *neigh = dst_neigh_lookup(skb_dst(skb), target); |
1419 | if (!neigh) { | |
675418d5 JP |
1420 | ND_PRINTK(2, warn, |
1421 | "Redirect: no neigh for target address\n"); | |
4991969a DM |
1422 | goto release; |
1423 | } | |
1424 | ||
1da177e4 LT |
1425 | read_lock_bh(&neigh->lock); |
1426 | if (neigh->nud_state & NUD_VALID) { | |
1427 | memcpy(ha_buf, neigh->ha, dev->addr_len); | |
1428 | read_unlock_bh(&neigh->lock); | |
1429 | ha = ha_buf; | |
1430 | len += ndisc_opt_addr_space(dev); | |
1431 | } else | |
1432 | read_unlock_bh(&neigh->lock); | |
4991969a DM |
1433 | |
1434 | neigh_release(neigh); | |
1da177e4 LT |
1435 | } |
1436 | ||
1437 | rd_len = min_t(unsigned int, | |
1438 | IPV6_MIN_MTU-sizeof(struct ipv6hdr)-len, skb->len + 8); | |
1439 | rd_len &= ~0x7; | |
1440 | len += rd_len; | |
1441 | ||
a7ae1992 HX |
1442 | hlen = LL_RESERVED_SPACE(dev); |
1443 | tlen = dev->needed_tailroom; | |
d54a81d3 DM |
1444 | buff = sock_alloc_send_skb(sk, |
1445 | (MAX_HEADER + sizeof(struct ipv6hdr) + | |
a7ae1992 | 1446 | len + hlen + tlen), |
1da177e4 LT |
1447 | 1, &err); |
1448 | if (buff == NULL) { | |
675418d5 JP |
1449 | ND_PRINTK(0, err, |
1450 | "Redirect: %s failed to allocate an skb, err=%d\n", | |
1451 | __func__, err); | |
d73f0801 | 1452 | goto release; |
1da177e4 LT |
1453 | } |
1454 | ||
a7ae1992 | 1455 | skb_reserve(buff, hlen); |
0660e03f | 1456 | ip6_nd_hdr(sk, buff, dev, &saddr_buf, &ipv6_hdr(skb)->saddr, |
1da177e4 LT |
1457 | IPPROTO_ICMPV6, len); |
1458 | ||
27a884dc | 1459 | skb_set_transport_header(buff, skb_tail_pointer(buff) - buff->data); |
d10ba34b ACM |
1460 | skb_put(buff, len); |
1461 | icmph = icmp6_hdr(buff); | |
1da177e4 LT |
1462 | |
1463 | memset(icmph, 0, sizeof(struct icmp6hdr)); | |
1464 | icmph->icmp6_type = NDISC_REDIRECT; | |
1465 | ||
1466 | /* | |
1467 | * copy target and destination addresses | |
1468 | */ | |
1469 | ||
1470 | addrp = (struct in6_addr *)(icmph + 1); | |
4e3fd7a0 | 1471 | *addrp = *target; |
1da177e4 | 1472 | addrp++; |
4e3fd7a0 | 1473 | *addrp = ipv6_hdr(skb)->daddr; |
1da177e4 LT |
1474 | |
1475 | opt = (u8*) (addrp + 1); | |
1476 | ||
1477 | /* | |
1478 | * include target_address option | |
1479 | */ | |
1480 | ||
1481 | if (ha) | |
1482 | opt = ndisc_fill_addr_option(opt, ND_OPT_TARGET_LL_ADDR, ha, | |
1483 | dev->addr_len, dev->type); | |
1484 | ||
1485 | /* | |
1486 | * build redirect option and copy skb over to the new packet. | |
1487 | */ | |
1488 | ||
1ab1457c | 1489 | memset(opt, 0, 8); |
1da177e4 LT |
1490 | *(opt++) = ND_OPT_REDIRECT_HDR; |
1491 | *(opt++) = (rd_len >> 3); | |
1492 | opt += 6; | |
1493 | ||
0660e03f | 1494 | memcpy(opt, ipv6_hdr(skb), rd_len - 8); |
1da177e4 | 1495 | |
0660e03f | 1496 | icmph->icmp6_cksum = csum_ipv6_magic(&saddr_buf, &ipv6_hdr(skb)->saddr, |
1da177e4 | 1497 | len, IPPROTO_ICMPV6, |
07f0757a | 1498 | csum_partial(icmph, len, 0)); |
1da177e4 | 1499 | |
adf30907 | 1500 | skb_dst_set(buff, dst); |
cfdf7647 ED |
1501 | rcu_read_lock(); |
1502 | idev = __in6_dev_get(dst->dev); | |
edf391ff | 1503 | IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len); |
b2e0b385 | 1504 | err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, buff, NULL, dst->dev, |
6e23ae2a | 1505 | dst_output); |
1da177e4 | 1506 | if (!err) { |
5c5d244b | 1507 | ICMP6MSGOUT_INC_STATS(net, idev, NDISC_REDIRECT); |
a862f6a6 | 1508 | ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); |
1da177e4 LT |
1509 | } |
1510 | ||
cfdf7647 | 1511 | rcu_read_unlock(); |
d73f0801 IJ |
1512 | return; |
1513 | ||
1514 | release: | |
1515 | dst_release(dst); | |
1da177e4 LT |
1516 | } |
1517 | ||
1518 | static void pndisc_redo(struct sk_buff *skb) | |
1519 | { | |
140e26fc | 1520 | ndisc_recv_ns(skb); |
1da177e4 LT |
1521 | kfree_skb(skb); |
1522 | } | |
1523 | ||
1524 | int ndisc_rcv(struct sk_buff *skb) | |
1525 | { | |
1526 | struct nd_msg *msg; | |
1527 | ||
1528 | if (!pskb_may_pull(skb, skb->len)) | |
1529 | return 0; | |
1530 | ||
9c70220b | 1531 | msg = (struct nd_msg *)skb_transport_header(skb); |
1da177e4 | 1532 | |
9c70220b | 1533 | __skb_push(skb, skb->data - skb_transport_header(skb)); |
1da177e4 | 1534 | |
0660e03f | 1535 | if (ipv6_hdr(skb)->hop_limit != 255) { |
675418d5 JP |
1536 | ND_PRINTK(2, warn, "NDISC: invalid hop-limit: %d\n", |
1537 | ipv6_hdr(skb)->hop_limit); | |
1da177e4 LT |
1538 | return 0; |
1539 | } | |
1540 | ||
1541 | if (msg->icmph.icmp6_code != 0) { | |
675418d5 JP |
1542 | ND_PRINTK(2, warn, "NDISC: invalid ICMPv6 code: %d\n", |
1543 | msg->icmph.icmp6_code); | |
1da177e4 LT |
1544 | return 0; |
1545 | } | |
1546 | ||
a61bbcf2 PM |
1547 | memset(NEIGH_CB(skb), 0, sizeof(struct neighbour_cb)); |
1548 | ||
1da177e4 LT |
1549 | switch (msg->icmph.icmp6_type) { |
1550 | case NDISC_NEIGHBOUR_SOLICITATION: | |
1551 | ndisc_recv_ns(skb); | |
1552 | break; | |
1553 | ||
1554 | case NDISC_NEIGHBOUR_ADVERTISEMENT: | |
1555 | ndisc_recv_na(skb); | |
1556 | break; | |
1557 | ||
1558 | case NDISC_ROUTER_SOLICITATION: | |
1559 | ndisc_recv_rs(skb); | |
1560 | break; | |
1561 | ||
1562 | case NDISC_ROUTER_ADVERTISEMENT: | |
1563 | ndisc_router_discovery(skb); | |
1564 | break; | |
1565 | ||
1566 | case NDISC_REDIRECT: | |
1567 | ndisc_redirect_rcv(skb); | |
1568 | break; | |
3ff50b79 | 1569 | } |
1da177e4 LT |
1570 | |
1571 | return 0; | |
1572 | } | |
1573 | ||
1574 | static int ndisc_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1575 | { | |
1576 | struct net_device *dev = ptr; | |
c346dca1 | 1577 | struct net *net = dev_net(dev); |
1da177e4 LT |
1578 | |
1579 | switch (event) { | |
1580 | case NETDEV_CHANGEADDR: | |
1581 | neigh_changeaddr(&nd_tbl, dev); | |
5b7c931d | 1582 | fib6_run_gc(~0UL, net); |
1da177e4 LT |
1583 | break; |
1584 | case NETDEV_DOWN: | |
1585 | neigh_ifdown(&nd_tbl, dev); | |
5b7c931d | 1586 | fib6_run_gc(~0UL, net); |
1da177e4 | 1587 | break; |
f47b9464 BH |
1588 | case NETDEV_NOTIFY_PEERS: |
1589 | ndisc_send_unsol_na(dev); | |
1590 | break; | |
1da177e4 LT |
1591 | default: |
1592 | break; | |
1593 | } | |
1594 | ||
1595 | return NOTIFY_DONE; | |
1596 | } | |
1597 | ||
1598 | static struct notifier_block ndisc_netdev_notifier = { | |
1599 | .notifier_call = ndisc_netdev_event, | |
1600 | }; | |
1601 | ||
1602 | #ifdef CONFIG_SYSCTL | |
1603 | static void ndisc_warn_deprecated_sysctl(struct ctl_table *ctl, | |
1604 | const char *func, const char *dev_name) | |
1605 | { | |
1606 | static char warncomm[TASK_COMM_LEN]; | |
1607 | static int warned; | |
1608 | if (strcmp(warncomm, current->comm) && warned < 5) { | |
1609 | strcpy(warncomm, current->comm); | |
f3213831 | 1610 | 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 |
1611 | warncomm, func, |
1612 | dev_name, ctl->procname, | |
1613 | dev_name, ctl->procname); | |
1614 | warned++; | |
1615 | } | |
1616 | } | |
1617 | ||
8d65af78 | 1618 | int ndisc_ifinfo_sysctl_change(struct ctl_table *ctl, int write, void __user *buffer, size_t *lenp, loff_t *ppos) |
1da177e4 LT |
1619 | { |
1620 | struct net_device *dev = ctl->extra1; | |
1621 | struct inet6_dev *idev; | |
1622 | int ret; | |
1623 | ||
d12af679 EB |
1624 | if ((strcmp(ctl->procname, "retrans_time") == 0) || |
1625 | (strcmp(ctl->procname, "base_reachable_time") == 0)) | |
1da177e4 LT |
1626 | ndisc_warn_deprecated_sysctl(ctl, "syscall", dev ? dev->name : "default"); |
1627 | ||
d12af679 | 1628 | if (strcmp(ctl->procname, "retrans_time") == 0) |
8d65af78 | 1629 | ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
d12af679 EB |
1630 | |
1631 | else if (strcmp(ctl->procname, "base_reachable_time") == 0) | |
1da177e4 | 1632 | ret = proc_dointvec_jiffies(ctl, write, |
8d65af78 | 1633 | buffer, lenp, ppos); |
d12af679 EB |
1634 | |
1635 | else if ((strcmp(ctl->procname, "retrans_time_ms") == 0) || | |
ad02ac14 | 1636 | (strcmp(ctl->procname, "base_reachable_time_ms") == 0)) |
1da177e4 | 1637 | ret = proc_dointvec_ms_jiffies(ctl, write, |
8d65af78 | 1638 | buffer, lenp, ppos); |
d12af679 | 1639 | else |
1da177e4 | 1640 | ret = -1; |
1da177e4 LT |
1641 | |
1642 | if (write && ret == 0 && dev && (idev = in6_dev_get(dev)) != NULL) { | |
d12af679 | 1643 | if (ctl->data == &idev->nd_parms->base_reachable_time) |
1da177e4 LT |
1644 | idev->nd_parms->reachable_time = neigh_rand_reach_time(idev->nd_parms->base_reachable_time); |
1645 | idev->tstamp = jiffies; | |
1646 | inet6_ifinfo_notify(RTM_NEWLINK, idev); | |
1647 | in6_dev_put(idev); | |
1648 | } | |
1649 | return ret; | |
1650 | } | |
1651 | ||
1da177e4 LT |
1652 | |
1653 | #endif | |
1654 | ||
2c8c1e72 | 1655 | static int __net_init ndisc_net_init(struct net *net) |
1da177e4 LT |
1656 | { |
1657 | struct ipv6_pinfo *np; | |
1658 | struct sock *sk; | |
1ab1457c | 1659 | int err; |
1da177e4 | 1660 | |
1ed8516f DL |
1661 | err = inet_ctl_sock_create(&sk, PF_INET6, |
1662 | SOCK_RAW, IPPROTO_ICMPV6, net); | |
1da177e4 | 1663 | if (err < 0) { |
675418d5 JP |
1664 | ND_PRINTK(0, err, |
1665 | "NDISC: Failed to initialize the control socket (err %d)\n", | |
1666 | err); | |
1da177e4 LT |
1667 | return err; |
1668 | } | |
1669 | ||
1ed8516f | 1670 | net->ipv6.ndisc_sk = sk; |
1762f7e8 | 1671 | |
1da177e4 | 1672 | np = inet6_sk(sk); |
1da177e4 LT |
1673 | np->hop_limit = 255; |
1674 | /* Do not loopback ndisc messages */ | |
1675 | np->mc_loop = 0; | |
1da177e4 | 1676 | |
1762f7e8 DL |
1677 | return 0; |
1678 | } | |
1679 | ||
2c8c1e72 | 1680 | static void __net_exit ndisc_net_exit(struct net *net) |
1762f7e8 | 1681 | { |
1ed8516f | 1682 | inet_ctl_sock_destroy(net->ipv6.ndisc_sk); |
1762f7e8 DL |
1683 | } |
1684 | ||
1685 | static struct pernet_operations ndisc_net_ops = { | |
1686 | .init = ndisc_net_init, | |
1687 | .exit = ndisc_net_exit, | |
1688 | }; | |
1689 | ||
1690 | int __init ndisc_init(void) | |
1691 | { | |
1692 | int err; | |
1693 | ||
1694 | err = register_pernet_subsys(&ndisc_net_ops); | |
1695 | if (err) | |
1696 | return err; | |
1ab1457c YH |
1697 | /* |
1698 | * Initialize the neighbour table | |
1699 | */ | |
1da177e4 LT |
1700 | neigh_table_init(&nd_tbl); |
1701 | ||
1702 | #ifdef CONFIG_SYSCTL | |
54716e3b | 1703 | err = neigh_sysctl_register(NULL, &nd_tbl.parms, "ipv6", |
f8572d8f | 1704 | &ndisc_ifinfo_sysctl_change); |
1762f7e8 DL |
1705 | if (err) |
1706 | goto out_unregister_pernet; | |
1da177e4 | 1707 | #endif |
1762f7e8 DL |
1708 | err = register_netdevice_notifier(&ndisc_netdev_notifier); |
1709 | if (err) | |
1710 | goto out_unregister_sysctl; | |
1711 | out: | |
1712 | return err; | |
1da177e4 | 1713 | |
1762f7e8 DL |
1714 | out_unregister_sysctl: |
1715 | #ifdef CONFIG_SYSCTL | |
1716 | neigh_sysctl_unregister(&nd_tbl.parms); | |
1717 | out_unregister_pernet: | |
1718 | #endif | |
1719 | unregister_pernet_subsys(&ndisc_net_ops); | |
1720 | goto out; | |
1da177e4 LT |
1721 | } |
1722 | ||
1723 | void ndisc_cleanup(void) | |
1724 | { | |
36f73d0c | 1725 | unregister_netdevice_notifier(&ndisc_netdev_notifier); |
1da177e4 LT |
1726 | #ifdef CONFIG_SYSCTL |
1727 | neigh_sysctl_unregister(&nd_tbl.parms); | |
1728 | #endif | |
1729 | neigh_table_clear(&nd_tbl); | |
1762f7e8 | 1730 | unregister_pernet_subsys(&ndisc_net_ops); |
1da177e4 | 1731 | } |