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 | ||
5f5a0115 | 146 | static void ndisc_fill_addr_option(struct sk_buff *skb, int type, void *data) |
1da177e4 | 147 | { |
5f5a0115 YH |
148 | int pad = ndisc_addr_option_pad(skb->dev->type); |
149 | int data_len = skb->dev->addr_len; | |
150 | int space = ndisc_opt_addr_space(skb->dev); | |
151 | u8 *opt = skb_put(skb, space); | |
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); | |
1da177e4 LT |
165 | } |
166 | ||
167 | static struct nd_opt_hdr *ndisc_next_option(struct nd_opt_hdr *cur, | |
168 | struct nd_opt_hdr *end) | |
169 | { | |
170 | int type; | |
171 | if (!cur || !end || cur >= end) | |
172 | return NULL; | |
173 | type = cur->nd_opt_type; | |
174 | do { | |
175 | cur = ((void *)cur) + (cur->nd_opt_len << 3); | |
176 | } while(cur < end && cur->nd_opt_type != type); | |
a02cec21 | 177 | return cur <= end && cur->nd_opt_type == type ? cur : NULL; |
1da177e4 LT |
178 | } |
179 | ||
31910575 PY |
180 | static inline int ndisc_is_useropt(struct nd_opt_hdr *opt) |
181 | { | |
e35f30c1 AF |
182 | return opt->nd_opt_type == ND_OPT_RDNSS || |
183 | opt->nd_opt_type == ND_OPT_DNSSL; | |
31910575 PY |
184 | } |
185 | ||
186 | static struct nd_opt_hdr *ndisc_next_useropt(struct nd_opt_hdr *cur, | |
187 | struct nd_opt_hdr *end) | |
188 | { | |
189 | if (!cur || !end || cur >= end) | |
190 | return NULL; | |
191 | do { | |
192 | cur = ((void *)cur) + (cur->nd_opt_len << 3); | |
193 | } while(cur < end && !ndisc_is_useropt(cur)); | |
a02cec21 | 194 | return cur <= end && ndisc_is_useropt(cur) ? cur : NULL; |
31910575 PY |
195 | } |
196 | ||
30f2a5f3 DM |
197 | struct ndisc_options *ndisc_parse_options(u8 *opt, int opt_len, |
198 | struct ndisc_options *ndopts) | |
1da177e4 LT |
199 | { |
200 | struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)opt; | |
201 | ||
202 | if (!nd_opt || opt_len < 0 || !ndopts) | |
203 | return NULL; | |
204 | memset(ndopts, 0, sizeof(*ndopts)); | |
205 | while (opt_len) { | |
206 | int l; | |
207 | if (opt_len < sizeof(struct nd_opt_hdr)) | |
208 | return NULL; | |
209 | l = nd_opt->nd_opt_len << 3; | |
210 | if (opt_len < l || l == 0) | |
211 | return NULL; | |
212 | switch (nd_opt->nd_opt_type) { | |
213 | case ND_OPT_SOURCE_LL_ADDR: | |
214 | case ND_OPT_TARGET_LL_ADDR: | |
215 | case ND_OPT_MTU: | |
216 | case ND_OPT_REDIRECT_HDR: | |
217 | if (ndopts->nd_opt_array[nd_opt->nd_opt_type]) { | |
675418d5 JP |
218 | ND_PRINTK(2, warn, |
219 | "%s: duplicated ND6 option found: type=%d\n", | |
220 | __func__, nd_opt->nd_opt_type); | |
1da177e4 LT |
221 | } else { |
222 | ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt; | |
223 | } | |
224 | break; | |
225 | case ND_OPT_PREFIX_INFO: | |
226 | ndopts->nd_opts_pi_end = nd_opt; | |
cfcabdcc | 227 | if (!ndopts->nd_opt_array[nd_opt->nd_opt_type]) |
1da177e4 LT |
228 | ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt; |
229 | break; | |
70ceb4f5 YH |
230 | #ifdef CONFIG_IPV6_ROUTE_INFO |
231 | case ND_OPT_ROUTE_INFO: | |
232 | ndopts->nd_opts_ri_end = nd_opt; | |
233 | if (!ndopts->nd_opts_ri) | |
234 | ndopts->nd_opts_ri = nd_opt; | |
235 | break; | |
236 | #endif | |
1da177e4 | 237 | default: |
31910575 PY |
238 | if (ndisc_is_useropt(nd_opt)) { |
239 | ndopts->nd_useropts_end = nd_opt; | |
240 | if (!ndopts->nd_useropts) | |
241 | ndopts->nd_useropts = nd_opt; | |
242 | } else { | |
243 | /* | |
244 | * Unknown options must be silently ignored, | |
245 | * to accommodate future extension to the | |
246 | * protocol. | |
247 | */ | |
675418d5 JP |
248 | ND_PRINTK(2, notice, |
249 | "%s: ignored unsupported option; type=%d, len=%d\n", | |
250 | __func__, | |
251 | nd_opt->nd_opt_type, | |
252 | nd_opt->nd_opt_len); | |
31910575 | 253 | } |
1da177e4 LT |
254 | } |
255 | opt_len -= l; | |
256 | nd_opt = ((void *)nd_opt) + l; | |
257 | } | |
258 | return ndopts; | |
259 | } | |
260 | ||
b71d1d42 | 261 | int ndisc_mc_map(const struct in6_addr *addr, char *buf, struct net_device *dev, int dir) |
1da177e4 LT |
262 | { |
263 | switch (dev->type) { | |
264 | case ARPHRD_ETHER: | |
265 | case ARPHRD_IEEE802: /* Not sure. Check it later. --ANK */ | |
266 | case ARPHRD_FDDI: | |
267 | ipv6_eth_mc_map(addr, buf); | |
268 | return 0; | |
1da177e4 LT |
269 | case ARPHRD_ARCNET: |
270 | ipv6_arcnet_mc_map(addr, buf); | |
271 | return 0; | |
272 | case ARPHRD_INFINIBAND: | |
a9e527e3 | 273 | ipv6_ib_mc_map(addr, dev->broadcast, buf); |
1da177e4 | 274 | return 0; |
93ca3bb5 TT |
275 | case ARPHRD_IPGRE: |
276 | return ipv6_ipgre_mc_map(addr, dev->broadcast, buf); | |
1da177e4 LT |
277 | default: |
278 | if (dir) { | |
279 | memcpy(buf, dev->broadcast, dev->addr_len); | |
280 | return 0; | |
281 | } | |
282 | } | |
283 | return -EINVAL; | |
284 | } | |
285 | ||
7159039a YH |
286 | EXPORT_SYMBOL(ndisc_mc_map); |
287 | ||
d6bf7817 ED |
288 | static u32 ndisc_hash(const void *pkey, |
289 | const struct net_device *dev, | |
2c2aba6c | 290 | __u32 *hash_rnd) |
1da177e4 | 291 | { |
2c2aba6c | 292 | return ndisc_hashfn(pkey, dev, hash_rnd); |
1da177e4 LT |
293 | } |
294 | ||
295 | static int ndisc_constructor(struct neighbour *neigh) | |
296 | { | |
297 | struct in6_addr *addr = (struct in6_addr*)&neigh->primary_key; | |
298 | struct net_device *dev = neigh->dev; | |
299 | struct inet6_dev *in6_dev; | |
300 | struct neigh_parms *parms; | |
a50feda5 | 301 | bool is_multicast = ipv6_addr_is_multicast(addr); |
1da177e4 | 302 | |
1da177e4 LT |
303 | in6_dev = in6_dev_get(dev); |
304 | if (in6_dev == NULL) { | |
1da177e4 LT |
305 | return -EINVAL; |
306 | } | |
307 | ||
308 | parms = in6_dev->nd_parms; | |
309 | __neigh_parms_put(neigh->parms); | |
310 | neigh->parms = neigh_parms_clone(parms); | |
1da177e4 LT |
311 | |
312 | neigh->type = is_multicast ? RTN_MULTICAST : RTN_UNICAST; | |
3b04ddde | 313 | if (!dev->header_ops) { |
1da177e4 LT |
314 | neigh->nud_state = NUD_NOARP; |
315 | neigh->ops = &ndisc_direct_ops; | |
8f40b161 | 316 | neigh->output = neigh_direct_output; |
1da177e4 LT |
317 | } else { |
318 | if (is_multicast) { | |
319 | neigh->nud_state = NUD_NOARP; | |
320 | ndisc_mc_map(addr, neigh->ha, dev, 1); | |
321 | } else if (dev->flags&(IFF_NOARP|IFF_LOOPBACK)) { | |
322 | neigh->nud_state = NUD_NOARP; | |
323 | memcpy(neigh->ha, dev->dev_addr, dev->addr_len); | |
324 | if (dev->flags&IFF_LOOPBACK) | |
325 | neigh->type = RTN_LOCAL; | |
326 | } else if (dev->flags&IFF_POINTOPOINT) { | |
327 | neigh->nud_state = NUD_NOARP; | |
328 | memcpy(neigh->ha, dev->broadcast, dev->addr_len); | |
329 | } | |
3b04ddde | 330 | if (dev->header_ops->cache) |
1da177e4 LT |
331 | neigh->ops = &ndisc_hh_ops; |
332 | else | |
333 | neigh->ops = &ndisc_generic_ops; | |
334 | if (neigh->nud_state&NUD_VALID) | |
335 | neigh->output = neigh->ops->connected_output; | |
336 | else | |
337 | neigh->output = neigh->ops->output; | |
338 | } | |
339 | in6_dev_put(in6_dev); | |
340 | return 0; | |
341 | } | |
342 | ||
343 | static int pndisc_constructor(struct pneigh_entry *n) | |
344 | { | |
345 | struct in6_addr *addr = (struct in6_addr*)&n->key; | |
346 | struct in6_addr maddr; | |
347 | struct net_device *dev = n->dev; | |
348 | ||
349 | if (dev == NULL || __in6_dev_get(dev) == NULL) | |
350 | return -EINVAL; | |
351 | addrconf_addr_solict_mult(addr, &maddr); | |
352 | ipv6_dev_mc_inc(dev, &maddr); | |
353 | return 0; | |
354 | } | |
355 | ||
356 | static void pndisc_destructor(struct pneigh_entry *n) | |
357 | { | |
358 | struct in6_addr *addr = (struct in6_addr*)&n->key; | |
359 | struct in6_addr maddr; | |
360 | struct net_device *dev = n->dev; | |
361 | ||
362 | if (dev == NULL || __in6_dev_get(dev) == NULL) | |
363 | return; | |
364 | addrconf_addr_solict_mult(addr, &maddr); | |
365 | ipv6_dev_mc_dec(dev, &maddr); | |
366 | } | |
367 | ||
de09334b YH |
368 | static struct sk_buff *ndisc_alloc_skb(struct net_device *dev, |
369 | int len) | |
370 | { | |
371 | int hlen = LL_RESERVED_SPACE(dev); | |
372 | int tlen = dev->needed_tailroom; | |
373 | struct sock *sk = dev_net(dev)->ipv6.ndisc_sk; | |
374 | struct sk_buff *skb; | |
de09334b | 375 | |
4b7ead80 | 376 | skb = alloc_skb(hlen + sizeof(struct ipv6hdr) + len + tlen, GFP_ATOMIC); |
de09334b | 377 | if (!skb) { |
4b7ead80 TG |
378 | ND_PRINTK(0, err, "ndisc: %s failed to allocate an skb\n", |
379 | __func__); | |
de09334b YH |
380 | return NULL; |
381 | } | |
382 | ||
f382d03a YH |
383 | skb->protocol = htons(ETH_P_IPV6); |
384 | skb->dev = dev; | |
385 | ||
527a150f | 386 | skb_reserve(skb, hlen + sizeof(struct ipv6hdr)); |
5135e633 | 387 | skb_reset_transport_header(skb); |
de09334b | 388 | |
4b7ead80 TG |
389 | /* Manually assign socket ownership as we avoid calling |
390 | * sock_alloc_send_pskb() to bypass wmem buffer limits | |
391 | */ | |
392 | skb_set_owner_w(skb, sk); | |
393 | ||
de09334b YH |
394 | return skb; |
395 | } | |
396 | ||
f382d03a | 397 | static void ip6_nd_hdr(struct sk_buff *skb, |
2576f17d YH |
398 | const struct in6_addr *saddr, |
399 | const struct in6_addr *daddr, | |
c8d6c380 | 400 | int hop_limit, int len) |
2576f17d YH |
401 | { |
402 | struct ipv6hdr *hdr; | |
403 | ||
527a150f | 404 | skb_push(skb, sizeof(*hdr)); |
2576f17d | 405 | skb_reset_network_header(skb); |
2576f17d YH |
406 | hdr = ipv6_hdr(skb); |
407 | ||
408 | ip6_flow_hdr(hdr, 0, 0); | |
409 | ||
410 | hdr->payload_len = htons(len); | |
c8d6c380 YH |
411 | hdr->nexthdr = IPPROTO_ICMPV6; |
412 | hdr->hop_limit = hop_limit; | |
2576f17d YH |
413 | |
414 | hdr->saddr = *saddr; | |
415 | hdr->daddr = *daddr; | |
416 | } | |
417 | ||
af9a9976 | 418 | static void ndisc_send_skb(struct sk_buff *skb, |
fd0ea7db | 419 | const struct in6_addr *daddr, |
aa4bdd4b | 420 | const struct in6_addr *saddr) |
305d552a | 421 | { |
f4de84c6 | 422 | struct dst_entry *dst = skb_dst(skb); |
af9a9976 | 423 | struct net *net = dev_net(skb->dev); |
7b3d9b06 | 424 | struct sock *sk = net->ipv6.ndisc_sk; |
305d552a BH |
425 | struct inet6_dev *idev; |
426 | int err; | |
aa4bdd4b | 427 | struct icmp6hdr *icmp6h = icmp6_hdr(skb); |
305d552a BH |
428 | u8 type; |
429 | ||
430 | type = icmp6h->icmp6_type; | |
431 | ||
f4de84c6 YH |
432 | if (!dst) { |
433 | struct sock *sk = net->ipv6.ndisc_sk; | |
434 | struct flowi6 fl6; | |
305d552a | 435 | |
f4de84c6 YH |
436 | icmpv6_flow_init(sk, &fl6, type, saddr, daddr, skb->dev->ifindex); |
437 | dst = icmp6_dst_alloc(skb->dev, &fl6); | |
438 | if (IS_ERR(dst)) { | |
439 | kfree_skb(skb); | |
440 | return; | |
441 | } | |
442 | ||
443 | skb_dst_set(skb, dst); | |
444 | } | |
e1ec7842 | 445 | |
7b3d9b06 YH |
446 | icmp6h->icmp6_cksum = csum_ipv6_magic(saddr, daddr, skb->len, |
447 | IPPROTO_ICMPV6, | |
448 | csum_partial(icmp6h, | |
449 | skb->len, 0)); | |
450 | ||
451 | ip6_nd_hdr(skb, saddr, daddr, inet6_sk(sk)->hop_limit, skb->len); | |
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 | |
e1ec7842 | 467 | static void ndisc_send_na(struct net_device *dev, struct neighbour *neigh, |
9acd9f3a YH |
468 | const struct in6_addr *daddr, |
469 | const struct in6_addr *solicited_addr, | |
fb568637 | 470 | bool router, bool solicited, bool override, bool inc_opt) |
e1ec7842 | 471 | { |
b44b5f4a | 472 | struct sk_buff *skb; |
e1ec7842 YH |
473 | struct in6_addr tmpaddr; |
474 | struct inet6_ifaddr *ifp; | |
9acd9f3a | 475 | const struct in6_addr *src_addr; |
1cb3fe51 YH |
476 | struct nd_msg *msg; |
477 | int optlen = 0; | |
e1ec7842 YH |
478 | |
479 | /* for anycast or proxy, solicited_addr != src_addr */ | |
c346dca1 | 480 | ifp = ipv6_get_ifaddr(dev_net(dev), solicited_addr, dev, 1); |
e1ec7842 YH |
481 | if (ifp) { |
482 | src_addr = solicited_addr; | |
483 | if (ifp->flags & IFA_F_OPTIMISTIC) | |
484 | override = 0; | |
9f888160 | 485 | inc_opt |= ifp->idev->cnf.force_tllao; |
e1ec7842 YH |
486 | in6_ifa_put(ifp); |
487 | } else { | |
191cd582 | 488 | if (ipv6_dev_get_saddr(dev_net(dev), dev, daddr, |
c346dca1 | 489 | inet6_sk(dev_net(dev)->ipv6.ndisc_sk)->srcprefs, |
7cbca67c | 490 | &tmpaddr)) |
e1ec7842 YH |
491 | return; |
492 | src_addr = &tmpaddr; | |
493 | } | |
494 | ||
1cb3fe51 YH |
495 | if (!dev->addr_len) |
496 | inc_opt = 0; | |
497 | if (inc_opt) | |
498 | optlen += ndisc_opt_addr_space(dev); | |
e1ec7842 | 499 | |
1cb3fe51 | 500 | skb = ndisc_alloc_skb(dev, sizeof(*msg) + optlen); |
b44b5f4a YH |
501 | if (!skb) |
502 | return; | |
503 | ||
1cb3fe51 YH |
504 | msg = (struct nd_msg *)skb_put(skb, sizeof(*msg)); |
505 | *msg = (struct nd_msg) { | |
506 | .icmph = { | |
507 | .icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT, | |
508 | .icmp6_router = router, | |
509 | .icmp6_solicited = solicited, | |
510 | .icmp6_override = override, | |
511 | }, | |
512 | .target = *solicited_addr, | |
513 | }; | |
514 | ||
515 | if (inc_opt) | |
516 | ndisc_fill_addr_option(skb, ND_OPT_TARGET_LL_ADDR, | |
517 | dev->dev_addr); | |
518 | ||
519 | ||
b44b5f4a | 520 | ndisc_send_skb(skb, daddr, src_addr); |
e1ec7842 YH |
521 | } |
522 | ||
f47b9464 BH |
523 | static void ndisc_send_unsol_na(struct net_device *dev) |
524 | { | |
525 | struct inet6_dev *idev; | |
526 | struct inet6_ifaddr *ifa; | |
f47b9464 BH |
527 | |
528 | idev = in6_dev_get(dev); | |
529 | if (!idev) | |
530 | return; | |
531 | ||
532 | read_lock_bh(&idev->lock); | |
533 | list_for_each_entry(ifa, &idev->addr_list, if_list) { | |
9fafd65a | 534 | ndisc_send_na(dev, NULL, &in6addr_linklocal_allnodes, &ifa->addr, |
f47b9464 BH |
535 | /*router=*/ !!idev->cnf.forwarding, |
536 | /*solicited=*/ false, /*override=*/ true, | |
537 | /*inc_opt=*/ true); | |
538 | } | |
539 | read_unlock_bh(&idev->lock); | |
540 | ||
541 | in6_dev_put(idev); | |
542 | } | |
543 | ||
1da177e4 | 544 | void ndisc_send_ns(struct net_device *dev, struct neighbour *neigh, |
9acd9f3a YH |
545 | const struct in6_addr *solicit, |
546 | const struct in6_addr *daddr, const struct in6_addr *saddr) | |
1da177e4 | 547 | { |
b44b5f4a | 548 | struct sk_buff *skb; |
1da177e4 | 549 | struct in6_addr addr_buf; |
1cb3fe51 YH |
550 | int inc_opt = dev->addr_len; |
551 | int optlen = 0; | |
552 | struct nd_msg *msg; | |
1da177e4 LT |
553 | |
554 | if (saddr == NULL) { | |
95c385b4 NH |
555 | if (ipv6_get_lladdr(dev, &addr_buf, |
556 | (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC))) | |
1da177e4 LT |
557 | return; |
558 | saddr = &addr_buf; | |
559 | } | |
560 | ||
1cb3fe51 YH |
561 | if (ipv6_addr_any(saddr)) |
562 | inc_opt = 0; | |
563 | if (inc_opt) | |
564 | optlen += ndisc_opt_addr_space(dev); | |
565 | ||
566 | skb = ndisc_alloc_skb(dev, sizeof(*msg) + optlen); | |
b44b5f4a YH |
567 | if (!skb) |
568 | return; | |
569 | ||
1cb3fe51 YH |
570 | msg = (struct nd_msg *)skb_put(skb, sizeof(*msg)); |
571 | *msg = (struct nd_msg) { | |
572 | .icmph = { | |
573 | .icmp6_type = NDISC_NEIGHBOUR_SOLICITATION, | |
574 | }, | |
575 | .target = *solicit, | |
576 | }; | |
577 | ||
578 | if (inc_opt) | |
579 | ndisc_fill_addr_option(skb, ND_OPT_SOURCE_LL_ADDR, | |
580 | dev->dev_addr); | |
581 | ||
b44b5f4a | 582 | ndisc_send_skb(skb, daddr, saddr); |
1da177e4 LT |
583 | } |
584 | ||
9acd9f3a YH |
585 | void ndisc_send_rs(struct net_device *dev, const struct in6_addr *saddr, |
586 | const struct in6_addr *daddr) | |
1da177e4 | 587 | { |
b44b5f4a | 588 | struct sk_buff *skb; |
1cb3fe51 | 589 | struct rs_msg *msg; |
95c385b4 | 590 | int send_sllao = dev->addr_len; |
1cb3fe51 | 591 | int optlen = 0; |
95c385b4 NH |
592 | |
593 | #ifdef CONFIG_IPV6_OPTIMISTIC_DAD | |
594 | /* | |
595 | * According to section 2.2 of RFC 4429, we must not | |
596 | * send router solicitations with a sllao from | |
597 | * optimistic addresses, but we may send the solicitation | |
598 | * if we don't include the sllao. So here we check | |
599 | * if our address is optimistic, and if so, we | |
bea85195 | 600 | * suppress the inclusion of the sllao. |
95c385b4 NH |
601 | */ |
602 | if (send_sllao) { | |
c346dca1 | 603 | struct inet6_ifaddr *ifp = ipv6_get_ifaddr(dev_net(dev), saddr, |
1cab3da6 | 604 | dev, 1); |
95c385b4 NH |
605 | if (ifp) { |
606 | if (ifp->flags & IFA_F_OPTIMISTIC) { | |
ca043569 | 607 | send_sllao = 0; |
95c385b4 | 608 | } |
ca043569 | 609 | in6_ifa_put(ifp); |
95c385b4 NH |
610 | } else { |
611 | send_sllao = 0; | |
612 | } | |
613 | } | |
614 | #endif | |
1cb3fe51 YH |
615 | if (send_sllao) |
616 | optlen += ndisc_opt_addr_space(dev); | |
617 | ||
618 | skb = ndisc_alloc_skb(dev, sizeof(*msg) + optlen); | |
b44b5f4a YH |
619 | if (!skb) |
620 | return; | |
621 | ||
1cb3fe51 YH |
622 | msg = (struct rs_msg *)skb_put(skb, sizeof(*msg)); |
623 | *msg = (struct rs_msg) { | |
624 | .icmph = { | |
625 | .icmp6_type = NDISC_ROUTER_SOLICITATION, | |
626 | }, | |
627 | }; | |
628 | ||
629 | if (send_sllao) | |
630 | ndisc_fill_addr_option(skb, ND_OPT_SOURCE_LL_ADDR, | |
631 | dev->dev_addr); | |
632 | ||
b44b5f4a | 633 | ndisc_send_skb(skb, daddr, saddr); |
1da177e4 | 634 | } |
1ab1457c | 635 | |
1da177e4 LT |
636 | |
637 | static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb) | |
638 | { | |
639 | /* | |
640 | * "The sender MUST return an ICMP | |
641 | * destination unreachable" | |
642 | */ | |
643 | dst_link_failure(skb); | |
644 | kfree_skb(skb); | |
645 | } | |
646 | ||
647 | /* Called with locked neigh: either read or both */ | |
648 | ||
649 | static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb) | |
650 | { | |
651 | struct in6_addr *saddr = NULL; | |
652 | struct in6_addr mcaddr; | |
653 | struct net_device *dev = neigh->dev; | |
654 | struct in6_addr *target = (struct in6_addr *)&neigh->primary_key; | |
655 | int probes = atomic_read(&neigh->probes); | |
656 | ||
c346dca1 | 657 | if (skb && ipv6_chk_addr(dev_net(dev), &ipv6_hdr(skb)->saddr, dev, 1)) |
0660e03f | 658 | saddr = &ipv6_hdr(skb)->saddr; |
1da177e4 LT |
659 | |
660 | if ((probes -= neigh->parms->ucast_probes) < 0) { | |
661 | if (!(neigh->nud_state & NUD_VALID)) { | |
675418d5 JP |
662 | ND_PRINTK(1, dbg, |
663 | "%s: trying to ucast probe in NUD_INVALID: %pI6\n", | |
664 | __func__, target); | |
1da177e4 LT |
665 | } |
666 | ndisc_send_ns(dev, neigh, target, target, saddr); | |
667 | } else if ((probes -= neigh->parms->app_probes) < 0) { | |
668 | #ifdef CONFIG_ARPD | |
669 | neigh_app_ns(neigh); | |
670 | #endif | |
671 | } else { | |
672 | addrconf_addr_solict_mult(target, &mcaddr); | |
673 | ndisc_send_ns(dev, NULL, target, &mcaddr, saddr); | |
674 | } | |
675 | } | |
676 | ||
0736ffc0 YH |
677 | static int pndisc_is_router(const void *pkey, |
678 | struct net_device *dev) | |
fa86d322 PE |
679 | { |
680 | struct pneigh_entry *n; | |
0736ffc0 | 681 | int ret = -1; |
fa86d322 PE |
682 | |
683 | read_lock_bh(&nd_tbl.lock); | |
0736ffc0 YH |
684 | n = __pneigh_lookup(&nd_tbl, dev_net(dev), pkey, dev); |
685 | if (n) | |
686 | ret = !!(n->flags & NTF_ROUTER); | |
fa86d322 PE |
687 | read_unlock_bh(&nd_tbl.lock); |
688 | ||
0736ffc0 | 689 | return ret; |
fa86d322 PE |
690 | } |
691 | ||
1da177e4 LT |
692 | static void ndisc_recv_ns(struct sk_buff *skb) |
693 | { | |
9c70220b | 694 | struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb); |
b71d1d42 ED |
695 | const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; |
696 | const struct in6_addr *daddr = &ipv6_hdr(skb)->daddr; | |
1da177e4 | 697 | u8 *lladdr = NULL; |
27a884dc ACM |
698 | u32 ndoptlen = skb->tail - (skb->transport_header + |
699 | offsetof(struct nd_msg, opt)); | |
1da177e4 LT |
700 | struct ndisc_options ndopts; |
701 | struct net_device *dev = skb->dev; | |
702 | struct inet6_ifaddr *ifp; | |
703 | struct inet6_dev *idev = NULL; | |
704 | struct neighbour *neigh; | |
705 | int dad = ipv6_addr_any(saddr); | |
a50feda5 | 706 | bool inc; |
0736ffc0 | 707 | int is_router = -1; |
1da177e4 | 708 | |
115b0aa6 YH |
709 | if (skb->len < sizeof(struct nd_msg)) { |
710 | ND_PRINTK(2, warn, "NS: packet too short\n"); | |
711 | return; | |
712 | } | |
713 | ||
1da177e4 | 714 | if (ipv6_addr_is_multicast(&msg->target)) { |
675418d5 | 715 | ND_PRINTK(2, warn, "NS: multicast target address\n"); |
1da177e4 LT |
716 | return; |
717 | } | |
718 | ||
719 | /* | |
720 | * RFC2461 7.1.1: | |
721 | * DAD has to be destined for solicited node multicast address. | |
722 | */ | |
ca97a644 | 723 | if (dad && !ipv6_addr_is_solict_mult(daddr)) { |
675418d5 | 724 | ND_PRINTK(2, warn, "NS: bad DAD packet (wrong destination)\n"); |
1da177e4 LT |
725 | return; |
726 | } | |
727 | ||
728 | if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) { | |
675418d5 | 729 | ND_PRINTK(2, warn, "NS: invalid ND options\n"); |
1da177e4 LT |
730 | return; |
731 | } | |
732 | ||
733 | if (ndopts.nd_opts_src_lladdr) { | |
734 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, dev); | |
735 | if (!lladdr) { | |
675418d5 JP |
736 | ND_PRINTK(2, warn, |
737 | "NS: invalid link-layer address length\n"); | |
1da177e4 LT |
738 | return; |
739 | } | |
740 | ||
741 | /* RFC2461 7.1.1: | |
1ab1457c YH |
742 | * If the IP source address is the unspecified address, |
743 | * there MUST NOT be source link-layer address option | |
1da177e4 LT |
744 | * in the message. |
745 | */ | |
746 | if (dad) { | |
675418d5 JP |
747 | ND_PRINTK(2, warn, |
748 | "NS: bad DAD packet (link-layer address option)\n"); | |
1da177e4 LT |
749 | return; |
750 | } | |
751 | } | |
752 | ||
753 | inc = ipv6_addr_is_multicast(daddr); | |
754 | ||
c346dca1 | 755 | ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1); |
a18bc695 | 756 | if (ifp) { |
95c385b4 NH |
757 | |
758 | if (ifp->flags & (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC)) { | |
759 | if (dad) { | |
95c385b4 NH |
760 | /* |
761 | * We are colliding with another node | |
762 | * who is doing DAD | |
763 | * so fail our DAD process | |
764 | */ | |
765 | addrconf_dad_failure(ifp); | |
9e3be4b3 | 766 | return; |
95c385b4 NH |
767 | } else { |
768 | /* | |
769 | * This is not a dad solicitation. | |
770 | * If we are an optimistic node, | |
771 | * we should respond. | |
772 | * Otherwise, we should ignore it. | |
773 | */ | |
774 | if (!(ifp->flags & IFA_F_OPTIMISTIC)) | |
1da177e4 | 775 | goto out; |
1da177e4 | 776 | } |
1da177e4 LT |
777 | } |
778 | ||
779 | idev = ifp->idev; | |
780 | } else { | |
53b7997f YH |
781 | struct net *net = dev_net(dev); |
782 | ||
1da177e4 LT |
783 | idev = in6_dev_get(dev); |
784 | if (!idev) { | |
785 | /* XXX: count this drop? */ | |
786 | return; | |
787 | } | |
788 | ||
53b7997f | 789 | if (ipv6_chk_acast_addr(net, dev, &msg->target) || |
1ab1457c | 790 | (idev->cnf.forwarding && |
53b7997f | 791 | (net->ipv6.devconf_all->proxy_ndp || idev->cnf.proxy_ndp) && |
0736ffc0 | 792 | (is_router = pndisc_is_router(&msg->target, dev)) >= 0)) { |
a61bbcf2 | 793 | if (!(NEIGH_CB(skb)->flags & LOCALLY_ENQUEUED) && |
1da177e4 LT |
794 | skb->pkt_type != PACKET_HOST && |
795 | inc != 0 && | |
796 | idev->nd_parms->proxy_delay != 0) { | |
797 | /* | |
798 | * for anycast or proxy, | |
1ab1457c YH |
799 | * sender should delay its response |
800 | * by a random time between 0 and | |
1da177e4 LT |
801 | * MAX_ANYCAST_DELAY_TIME seconds. |
802 | * (RFC2461) -- yoshfuji | |
803 | */ | |
804 | struct sk_buff *n = skb_clone(skb, GFP_ATOMIC); | |
805 | if (n) | |
806 | pneigh_enqueue(&nd_tbl, idev->nd_parms, n); | |
807 | goto out; | |
808 | } | |
809 | } else | |
810 | goto out; | |
811 | } | |
812 | ||
0736ffc0 | 813 | if (is_router < 0) |
fb568637 | 814 | is_router = idev->cnf.forwarding; |
62dd9318 | 815 | |
1da177e4 | 816 | if (dad) { |
f3ee4010 | 817 | ndisc_send_na(dev, NULL, &in6addr_linklocal_allnodes, &msg->target, |
fb568637 | 818 | !!is_router, false, (ifp != NULL), true); |
1da177e4 LT |
819 | goto out; |
820 | } | |
821 | ||
822 | if (inc) | |
823 | NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_mcast); | |
824 | else | |
825 | NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_ucast); | |
826 | ||
1ab1457c | 827 | /* |
1da177e4 LT |
828 | * update / create cache entry |
829 | * for the source address | |
830 | */ | |
831 | neigh = __neigh_lookup(&nd_tbl, saddr, dev, | |
832 | !inc || lladdr || !dev->addr_len); | |
833 | if (neigh) | |
1ab1457c | 834 | neigh_update(neigh, lladdr, NUD_STALE, |
1da177e4 LT |
835 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
836 | NEIGH_UPDATE_F_OVERRIDE); | |
3b04ddde | 837 | if (neigh || !dev->header_ops) { |
1da177e4 | 838 | ndisc_send_na(dev, neigh, saddr, &msg->target, |
fb568637 YH |
839 | !!is_router, |
840 | true, (ifp != NULL && inc), inc); | |
1da177e4 LT |
841 | if (neigh) |
842 | neigh_release(neigh); | |
843 | } | |
844 | ||
845 | out: | |
846 | if (ifp) | |
847 | in6_ifa_put(ifp); | |
848 | else | |
849 | in6_dev_put(idev); | |
1da177e4 LT |
850 | } |
851 | ||
852 | static void ndisc_recv_na(struct sk_buff *skb) | |
853 | { | |
9c70220b | 854 | struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb); |
b71d1d42 ED |
855 | const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; |
856 | const struct in6_addr *daddr = &ipv6_hdr(skb)->daddr; | |
1da177e4 | 857 | u8 *lladdr = NULL; |
27a884dc ACM |
858 | u32 ndoptlen = skb->tail - (skb->transport_header + |
859 | offsetof(struct nd_msg, opt)); | |
1da177e4 LT |
860 | struct ndisc_options ndopts; |
861 | struct net_device *dev = skb->dev; | |
862 | struct inet6_ifaddr *ifp; | |
863 | struct neighbour *neigh; | |
864 | ||
865 | if (skb->len < sizeof(struct nd_msg)) { | |
675418d5 | 866 | ND_PRINTK(2, warn, "NA: packet too short\n"); |
1da177e4 LT |
867 | return; |
868 | } | |
869 | ||
870 | if (ipv6_addr_is_multicast(&msg->target)) { | |
675418d5 | 871 | ND_PRINTK(2, warn, "NA: target address is multicast\n"); |
1da177e4 LT |
872 | return; |
873 | } | |
874 | ||
875 | if (ipv6_addr_is_multicast(daddr) && | |
876 | msg->icmph.icmp6_solicited) { | |
675418d5 | 877 | ND_PRINTK(2, warn, "NA: solicited NA is multicasted\n"); |
1da177e4 LT |
878 | return; |
879 | } | |
1ab1457c | 880 | |
1da177e4 | 881 | if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) { |
675418d5 | 882 | ND_PRINTK(2, warn, "NS: invalid ND option\n"); |
1da177e4 LT |
883 | return; |
884 | } | |
885 | if (ndopts.nd_opts_tgt_lladdr) { | |
886 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, dev); | |
887 | if (!lladdr) { | |
675418d5 JP |
888 | ND_PRINTK(2, warn, |
889 | "NA: invalid link-layer address length\n"); | |
1da177e4 LT |
890 | return; |
891 | } | |
892 | } | |
c346dca1 | 893 | ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1); |
a18bc695 | 894 | if (ifp) { |
bd015928 DW |
895 | if (skb->pkt_type != PACKET_LOOPBACK |
896 | && (ifp->flags & IFA_F_TENTATIVE)) { | |
897 | addrconf_dad_failure(ifp); | |
898 | return; | |
1da177e4 LT |
899 | } |
900 | /* What should we make now? The advertisement | |
901 | is invalid, but ndisc specs say nothing | |
902 | about it. It could be misconfiguration, or | |
903 | an smart proxy agent tries to help us :-) | |
24fc7b86 JS |
904 | |
905 | We should not print the error if NA has been | |
906 | received from loopback - it is just our own | |
907 | unsolicited advertisement. | |
1da177e4 | 908 | */ |
24fc7b86 | 909 | if (skb->pkt_type != PACKET_LOOPBACK) |
675418d5 JP |
910 | ND_PRINTK(1, warn, |
911 | "NA: someone advertises our address %pI6 on %s!\n", | |
912 | &ifp->addr, ifp->idev->dev->name); | |
1da177e4 LT |
913 | in6_ifa_put(ifp); |
914 | return; | |
915 | } | |
916 | neigh = neigh_lookup(&nd_tbl, &msg->target, dev); | |
917 | ||
918 | if (neigh) { | |
919 | u8 old_flags = neigh->flags; | |
53b7997f | 920 | struct net *net = dev_net(dev); |
1da177e4 LT |
921 | |
922 | if (neigh->nud_state & NUD_FAILED) | |
923 | goto out; | |
924 | ||
5f3e6e9e VN |
925 | /* |
926 | * Don't update the neighbor cache entry on a proxy NA from | |
927 | * ourselves because either the proxied node is off link or it | |
928 | * has already sent a NA to us. | |
929 | */ | |
930 | if (lladdr && !memcmp(lladdr, dev->dev_addr, dev->addr_len) && | |
53b7997f YH |
931 | net->ipv6.devconf_all->forwarding && net->ipv6.devconf_all->proxy_ndp && |
932 | pneigh_lookup(&nd_tbl, net, &msg->target, dev, 0)) { | |
b20b6d97 | 933 | /* XXX: idev->cnf.proxy_ndp */ |
5f3e6e9e | 934 | goto out; |
fbea49e1 | 935 | } |
5f3e6e9e | 936 | |
1da177e4 LT |
937 | neigh_update(neigh, lladdr, |
938 | msg->icmph.icmp6_solicited ? NUD_REACHABLE : NUD_STALE, | |
939 | NEIGH_UPDATE_F_WEAK_OVERRIDE| | |
940 | (msg->icmph.icmp6_override ? NEIGH_UPDATE_F_OVERRIDE : 0)| | |
941 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
942 | (msg->icmph.icmp6_router ? NEIGH_UPDATE_F_ISROUTER : 0)); | |
943 | ||
944 | if ((old_flags & ~neigh->flags) & NTF_ROUTER) { | |
945 | /* | |
946 | * Change: router to host | |
947 | */ | |
948 | struct rt6_info *rt; | |
949 | rt = rt6_get_dflt_router(saddr, dev); | |
950 | if (rt) | |
e0a1ad73 | 951 | ip6_del_rt(rt); |
1da177e4 LT |
952 | } |
953 | ||
954 | out: | |
955 | neigh_release(neigh); | |
956 | } | |
957 | } | |
958 | ||
959 | static void ndisc_recv_rs(struct sk_buff *skb) | |
960 | { | |
9c70220b | 961 | struct rs_msg *rs_msg = (struct rs_msg *)skb_transport_header(skb); |
1da177e4 LT |
962 | unsigned long ndoptlen = skb->len - sizeof(*rs_msg); |
963 | struct neighbour *neigh; | |
964 | struct inet6_dev *idev; | |
b71d1d42 | 965 | const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; |
1da177e4 LT |
966 | struct ndisc_options ndopts; |
967 | u8 *lladdr = NULL; | |
968 | ||
969 | if (skb->len < sizeof(*rs_msg)) | |
970 | return; | |
971 | ||
cfdf7647 | 972 | idev = __in6_dev_get(skb->dev); |
1da177e4 | 973 | if (!idev) { |
675418d5 | 974 | ND_PRINTK(1, err, "RS: can't find in6 device\n"); |
1da177e4 LT |
975 | return; |
976 | } | |
977 | ||
978 | /* Don't accept RS if we're not in router mode */ | |
979 | if (!idev->cnf.forwarding) | |
980 | goto out; | |
981 | ||
982 | /* | |
983 | * Don't update NCE if src = ::; | |
984 | * this implies that the source node has no ip address assigned yet. | |
985 | */ | |
986 | if (ipv6_addr_any(saddr)) | |
987 | goto out; | |
988 | ||
989 | /* Parse ND options */ | |
990 | if (!ndisc_parse_options(rs_msg->opt, ndoptlen, &ndopts)) { | |
675418d5 | 991 | ND_PRINTK(2, notice, "NS: invalid ND option, ignored\n"); |
1da177e4 LT |
992 | goto out; |
993 | } | |
994 | ||
995 | if (ndopts.nd_opts_src_lladdr) { | |
996 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, | |
997 | skb->dev); | |
998 | if (!lladdr) | |
999 | goto out; | |
1000 | } | |
1001 | ||
1002 | neigh = __neigh_lookup(&nd_tbl, saddr, skb->dev, 1); | |
1003 | if (neigh) { | |
1004 | neigh_update(neigh, lladdr, NUD_STALE, | |
1005 | NEIGH_UPDATE_F_WEAK_OVERRIDE| | |
1006 | NEIGH_UPDATE_F_OVERRIDE| | |
1007 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER); | |
1008 | neigh_release(neigh); | |
1009 | } | |
1010 | out: | |
cfdf7647 | 1011 | return; |
1da177e4 LT |
1012 | } |
1013 | ||
31910575 PY |
1014 | static void ndisc_ra_useropt(struct sk_buff *ra, struct nd_opt_hdr *opt) |
1015 | { | |
1016 | struct icmp6hdr *icmp6h = (struct icmp6hdr *)skb_transport_header(ra); | |
1017 | struct sk_buff *skb; | |
1018 | struct nlmsghdr *nlh; | |
1019 | struct nduseroptmsg *ndmsg; | |
c346dca1 | 1020 | struct net *net = dev_net(ra->dev); |
31910575 PY |
1021 | int err; |
1022 | int base_size = NLMSG_ALIGN(sizeof(struct nduseroptmsg) | |
1023 | + (opt->nd_opt_len << 3)); | |
1024 | size_t msg_size = base_size + nla_total_size(sizeof(struct in6_addr)); | |
1025 | ||
1026 | skb = nlmsg_new(msg_size, GFP_ATOMIC); | |
1027 | if (skb == NULL) { | |
1028 | err = -ENOBUFS; | |
1029 | goto errout; | |
1030 | } | |
1031 | ||
1032 | nlh = nlmsg_put(skb, 0, 0, RTM_NEWNDUSEROPT, base_size, 0); | |
1033 | if (nlh == NULL) { | |
1034 | goto nla_put_failure; | |
1035 | } | |
1036 | ||
1037 | ndmsg = nlmsg_data(nlh); | |
1038 | ndmsg->nduseropt_family = AF_INET6; | |
dbb2ed24 | 1039 | ndmsg->nduseropt_ifindex = ra->dev->ifindex; |
31910575 PY |
1040 | ndmsg->nduseropt_icmp_type = icmp6h->icmp6_type; |
1041 | ndmsg->nduseropt_icmp_code = icmp6h->icmp6_code; | |
1042 | ndmsg->nduseropt_opts_len = opt->nd_opt_len << 3; | |
1043 | ||
1044 | memcpy(ndmsg + 1, opt, opt->nd_opt_len << 3); | |
1045 | ||
c78679e8 DM |
1046 | if (nla_put(skb, NDUSEROPT_SRCADDR, sizeof(struct in6_addr), |
1047 | &ipv6_hdr(ra)->saddr)) | |
1048 | goto nla_put_failure; | |
31910575 PY |
1049 | nlmsg_end(skb, nlh); |
1050 | ||
1ce85fe4 | 1051 | rtnl_notify(skb, net, 0, RTNLGRP_ND_USEROPT, NULL, GFP_ATOMIC); |
31910575 PY |
1052 | return; |
1053 | ||
1054 | nla_put_failure: | |
1055 | nlmsg_free(skb); | |
1056 | err = -EMSGSIZE; | |
1057 | errout: | |
a18bc695 | 1058 | rtnl_set_sk_err(net, RTNLGRP_ND_USEROPT, err); |
31910575 PY |
1059 | } |
1060 | ||
1da177e4 LT |
1061 | static void ndisc_router_discovery(struct sk_buff *skb) |
1062 | { | |
9c70220b | 1063 | struct ra_msg *ra_msg = (struct ra_msg *)skb_transport_header(skb); |
1da177e4 LT |
1064 | struct neighbour *neigh = NULL; |
1065 | struct inet6_dev *in6_dev; | |
65f5c7c1 | 1066 | struct rt6_info *rt = NULL; |
1da177e4 LT |
1067 | int lifetime; |
1068 | struct ndisc_options ndopts; | |
1069 | int optlen; | |
ebacaaa0 | 1070 | unsigned int pref = 0; |
1da177e4 LT |
1071 | |
1072 | __u8 * opt = (__u8 *)(ra_msg + 1); | |
1073 | ||
27a884dc | 1074 | optlen = (skb->tail - skb->transport_header) - sizeof(struct ra_msg); |
1da177e4 | 1075 | |
0660e03f | 1076 | if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) { |
675418d5 | 1077 | ND_PRINTK(2, warn, "RA: source address is not link-local\n"); |
1da177e4 LT |
1078 | return; |
1079 | } | |
1080 | if (optlen < 0) { | |
675418d5 | 1081 | ND_PRINTK(2, warn, "RA: packet too short\n"); |
1da177e4 LT |
1082 | return; |
1083 | } | |
1084 | ||
de357cc0 | 1085 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 | 1086 | if (skb->ndisc_nodetype == NDISC_NODETYPE_HOST) { |
675418d5 | 1087 | ND_PRINTK(2, warn, "RA: from host or unauthorized router\n"); |
fadf6bf0 TF |
1088 | return; |
1089 | } | |
de357cc0 | 1090 | #endif |
fadf6bf0 | 1091 | |
1da177e4 LT |
1092 | /* |
1093 | * set the RA_RECV flag in the interface | |
1094 | */ | |
1095 | ||
cfdf7647 | 1096 | in6_dev = __in6_dev_get(skb->dev); |
1da177e4 | 1097 | if (in6_dev == NULL) { |
675418d5 JP |
1098 | ND_PRINTK(0, err, "RA: can't find inet6 device for %s\n", |
1099 | skb->dev->name); | |
1da177e4 LT |
1100 | return; |
1101 | } | |
1da177e4 LT |
1102 | |
1103 | if (!ndisc_parse_options(opt, optlen, &ndopts)) { | |
675418d5 | 1104 | ND_PRINTK(2, warn, "RA: invalid ND options\n"); |
1da177e4 LT |
1105 | return; |
1106 | } | |
1107 | ||
aeaf6e9d | 1108 | if (!ipv6_accept_ra(in6_dev)) |
31ce8c71 DW |
1109 | goto skip_linkparms; |
1110 | ||
de357cc0 | 1111 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 TF |
1112 | /* skip link-specific parameters from interior routers */ |
1113 | if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT) | |
1114 | goto skip_linkparms; | |
de357cc0 | 1115 | #endif |
fadf6bf0 | 1116 | |
1da177e4 LT |
1117 | if (in6_dev->if_flags & IF_RS_SENT) { |
1118 | /* | |
1119 | * flag that an RA was received after an RS was sent | |
1120 | * out on this interface. | |
1121 | */ | |
1122 | in6_dev->if_flags |= IF_RA_RCVD; | |
1123 | } | |
1124 | ||
1125 | /* | |
1126 | * Remember the managed/otherconf flags from most recently | |
1127 | * received RA message (RFC 2462) -- yoshfuji | |
1128 | */ | |
1129 | in6_dev->if_flags = (in6_dev->if_flags & ~(IF_RA_MANAGED | | |
1130 | IF_RA_OTHERCONF)) | | |
1131 | (ra_msg->icmph.icmp6_addrconf_managed ? | |
1132 | IF_RA_MANAGED : 0) | | |
1133 | (ra_msg->icmph.icmp6_addrconf_other ? | |
1134 | IF_RA_OTHERCONF : 0); | |
1135 | ||
65f5c7c1 YH |
1136 | if (!in6_dev->cnf.accept_ra_defrtr) |
1137 | goto skip_defrtr; | |
1138 | ||
9f56220f AH |
1139 | if (ipv6_chk_addr(dev_net(in6_dev->dev), &ipv6_hdr(skb)->saddr, NULL, 0)) |
1140 | goto skip_defrtr; | |
1141 | ||
1da177e4 LT |
1142 | lifetime = ntohs(ra_msg->icmph.icmp6_rt_lifetime); |
1143 | ||
ebacaaa0 YH |
1144 | #ifdef CONFIG_IPV6_ROUTER_PREF |
1145 | pref = ra_msg->icmph.icmp6_router_pref; | |
1146 | /* 10b is handled as if it were 00b (medium) */ | |
930d6ff2 | 1147 | if (pref == ICMPV6_ROUTER_PREF_INVALID || |
6d5b78cd | 1148 | !in6_dev->cnf.accept_ra_rtr_pref) |
ebacaaa0 YH |
1149 | pref = ICMPV6_ROUTER_PREF_MEDIUM; |
1150 | #endif | |
1151 | ||
0660e03f | 1152 | rt = rt6_get_dflt_router(&ipv6_hdr(skb)->saddr, skb->dev); |
1da177e4 | 1153 | |
eb857186 DM |
1154 | if (rt) { |
1155 | neigh = dst_neigh_lookup(&rt->dst, &ipv6_hdr(skb)->saddr); | |
1156 | if (!neigh) { | |
675418d5 JP |
1157 | ND_PRINTK(0, err, |
1158 | "RA: %s got default router without neighbour\n", | |
1159 | __func__); | |
94e187c0 | 1160 | ip6_rt_put(rt); |
eb857186 DM |
1161 | return; |
1162 | } | |
1163 | } | |
1da177e4 | 1164 | if (rt && lifetime == 0) { |
e0a1ad73 | 1165 | ip6_del_rt(rt); |
1da177e4 LT |
1166 | rt = NULL; |
1167 | } | |
1168 | ||
1169 | if (rt == NULL && lifetime) { | |
675418d5 | 1170 | ND_PRINTK(3, dbg, "RA: adding default router\n"); |
1da177e4 | 1171 | |
0660e03f | 1172 | rt = rt6_add_dflt_router(&ipv6_hdr(skb)->saddr, skb->dev, pref); |
1da177e4 | 1173 | if (rt == NULL) { |
675418d5 JP |
1174 | ND_PRINTK(0, err, |
1175 | "RA: %s failed to add default route\n", | |
1176 | __func__); | |
1da177e4 LT |
1177 | return; |
1178 | } | |
1179 | ||
eb857186 | 1180 | neigh = dst_neigh_lookup(&rt->dst, &ipv6_hdr(skb)->saddr); |
1da177e4 | 1181 | if (neigh == NULL) { |
675418d5 JP |
1182 | ND_PRINTK(0, err, |
1183 | "RA: %s got default router without neighbour\n", | |
1184 | __func__); | |
94e187c0 | 1185 | ip6_rt_put(rt); |
1da177e4 LT |
1186 | return; |
1187 | } | |
1188 | neigh->flags |= NTF_ROUTER; | |
ebacaaa0 | 1189 | } else if (rt) { |
22441cfa | 1190 | rt->rt6i_flags = (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); |
1da177e4 LT |
1191 | } |
1192 | ||
1193 | if (rt) | |
1716a961 | 1194 | rt6_set_expires(rt, jiffies + (HZ * lifetime)); |
1da177e4 | 1195 | if (ra_msg->icmph.icmp6_hop_limit) { |
4b9e9796 S |
1196 | /* Only set hop_limit on the interface if it is higher than |
1197 | * the current hop_limit. | |
1198 | */ | |
5a226737 | 1199 | if (in6_dev->cnf.hop_limit < ra_msg->icmph.icmp6_hop_limit) { |
4b9e9796 | 1200 | in6_dev->cnf.hop_limit = ra_msg->icmph.icmp6_hop_limit; |
5a226737 | 1201 | } else { |
4b9e9796 | 1202 | ND_PRINTK(2, warn, "RA: Got route advertisement with lower hop_limit than current\n"); |
5a226737 | 1203 | } |
1da177e4 | 1204 | if (rt) |
defb3519 DM |
1205 | dst_metric_set(&rt->dst, RTAX_HOPLIMIT, |
1206 | ra_msg->icmph.icmp6_hop_limit); | |
1da177e4 LT |
1207 | } |
1208 | ||
65f5c7c1 YH |
1209 | skip_defrtr: |
1210 | ||
1da177e4 LT |
1211 | /* |
1212 | * Update Reachable Time and Retrans Timer | |
1213 | */ | |
1214 | ||
1215 | if (in6_dev->nd_parms) { | |
1216 | unsigned long rtime = ntohl(ra_msg->retrans_timer); | |
1217 | ||
1218 | if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/HZ) { | |
1219 | rtime = (rtime*HZ)/1000; | |
1220 | if (rtime < HZ/10) | |
1221 | rtime = HZ/10; | |
1222 | in6_dev->nd_parms->retrans_time = rtime; | |
1223 | in6_dev->tstamp = jiffies; | |
1224 | inet6_ifinfo_notify(RTM_NEWLINK, in6_dev); | |
1225 | } | |
1226 | ||
1227 | rtime = ntohl(ra_msg->reachable_time); | |
1228 | if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/(3*HZ)) { | |
1229 | rtime = (rtime*HZ)/1000; | |
1230 | ||
1231 | if (rtime < HZ/10) | |
1232 | rtime = HZ/10; | |
1233 | ||
1234 | if (rtime != in6_dev->nd_parms->base_reachable_time) { | |
1235 | in6_dev->nd_parms->base_reachable_time = rtime; | |
1236 | in6_dev->nd_parms->gc_staletime = 3 * rtime; | |
1237 | in6_dev->nd_parms->reachable_time = neigh_rand_reach_time(rtime); | |
1238 | in6_dev->tstamp = jiffies; | |
1239 | inet6_ifinfo_notify(RTM_NEWLINK, in6_dev); | |
1240 | } | |
1241 | } | |
1242 | } | |
1243 | ||
fadf6bf0 TF |
1244 | skip_linkparms: |
1245 | ||
1da177e4 LT |
1246 | /* |
1247 | * Process options. | |
1248 | */ | |
1249 | ||
1250 | if (!neigh) | |
0660e03f | 1251 | neigh = __neigh_lookup(&nd_tbl, &ipv6_hdr(skb)->saddr, |
1da177e4 LT |
1252 | skb->dev, 1); |
1253 | if (neigh) { | |
1254 | u8 *lladdr = NULL; | |
1255 | if (ndopts.nd_opts_src_lladdr) { | |
1256 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, | |
1257 | skb->dev); | |
1258 | if (!lladdr) { | |
675418d5 JP |
1259 | ND_PRINTK(2, warn, |
1260 | "RA: invalid link-layer address length\n"); | |
1da177e4 LT |
1261 | goto out; |
1262 | } | |
1263 | } | |
1264 | neigh_update(neigh, lladdr, NUD_STALE, | |
1265 | NEIGH_UPDATE_F_WEAK_OVERRIDE| | |
1266 | NEIGH_UPDATE_F_OVERRIDE| | |
1267 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
1268 | NEIGH_UPDATE_F_ISROUTER); | |
1269 | } | |
1270 | ||
aeaf6e9d | 1271 | if (!ipv6_accept_ra(in6_dev)) |
31ce8c71 DW |
1272 | goto out; |
1273 | ||
70ceb4f5 | 1274 | #ifdef CONFIG_IPV6_ROUTE_INFO |
9f56220f AH |
1275 | if (ipv6_chk_addr(dev_net(in6_dev->dev), &ipv6_hdr(skb)->saddr, NULL, 0)) |
1276 | goto skip_routeinfo; | |
1277 | ||
09c884d4 | 1278 | if (in6_dev->cnf.accept_ra_rtr_pref && ndopts.nd_opts_ri) { |
70ceb4f5 YH |
1279 | struct nd_opt_hdr *p; |
1280 | for (p = ndopts.nd_opts_ri; | |
1281 | p; | |
1282 | p = ndisc_next_option(p, ndopts.nd_opts_ri_end)) { | |
6294e000 YH |
1283 | struct route_info *ri = (struct route_info *)p; |
1284 | #ifdef CONFIG_IPV6_NDISC_NODETYPE | |
1285 | if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT && | |
1286 | ri->prefix_len == 0) | |
1287 | continue; | |
1288 | #endif | |
1289 | if (ri->prefix_len > in6_dev->cnf.accept_ra_rt_info_max_plen) | |
09c884d4 | 1290 | continue; |
70ceb4f5 | 1291 | rt6_route_rcv(skb->dev, (u8*)p, (p->nd_opt_len) << 3, |
0660e03f | 1292 | &ipv6_hdr(skb)->saddr); |
70ceb4f5 YH |
1293 | } |
1294 | } | |
9f56220f AH |
1295 | |
1296 | skip_routeinfo: | |
70ceb4f5 YH |
1297 | #endif |
1298 | ||
de357cc0 | 1299 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 TF |
1300 | /* skip link-specific ndopts from interior routers */ |
1301 | if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT) | |
1302 | goto out; | |
de357cc0 | 1303 | #endif |
fadf6bf0 | 1304 | |
c4fd30eb | 1305 | if (in6_dev->cnf.accept_ra_pinfo && ndopts.nd_opts_pi) { |
1da177e4 LT |
1306 | struct nd_opt_hdr *p; |
1307 | for (p = ndopts.nd_opts_pi; | |
1308 | p; | |
1309 | p = ndisc_next_option(p, ndopts.nd_opts_pi_end)) { | |
e6bff995 NH |
1310 | addrconf_prefix_rcv(skb->dev, (u8 *)p, |
1311 | (p->nd_opt_len) << 3, | |
1312 | ndopts.nd_opts_src_lladdr != NULL); | |
1da177e4 LT |
1313 | } |
1314 | } | |
1315 | ||
1316 | if (ndopts.nd_opts_mtu) { | |
e69a4adc | 1317 | __be32 n; |
1da177e4 LT |
1318 | u32 mtu; |
1319 | ||
e69a4adc AV |
1320 | memcpy(&n, ((u8*)(ndopts.nd_opts_mtu+1))+2, sizeof(mtu)); |
1321 | mtu = ntohl(n); | |
1da177e4 LT |
1322 | |
1323 | if (mtu < IPV6_MIN_MTU || mtu > skb->dev->mtu) { | |
675418d5 | 1324 | ND_PRINTK(2, warn, "RA: invalid mtu: %d\n", mtu); |
1da177e4 LT |
1325 | } else if (in6_dev->cnf.mtu6 != mtu) { |
1326 | in6_dev->cnf.mtu6 = mtu; | |
1327 | ||
1328 | if (rt) | |
defb3519 | 1329 | dst_metric_set(&rt->dst, RTAX_MTU, mtu); |
1da177e4 LT |
1330 | |
1331 | rt6_mtu_change(skb->dev, mtu); | |
1332 | } | |
1333 | } | |
1ab1457c | 1334 | |
6fa3eb70 S |
1335 | #ifdef CONFIG_MTK_DHCPV6C_WIFI |
1336 | if (in6_dev->if_flags & IF_RA_OTHERCONF){ | |
1337 | printk(KERN_INFO "[mtk_net][ipv6]receive RA with o bit!\n"); | |
1338 | in6_dev->cnf.ra_info_flag = 1; | |
1339 | } | |
1340 | if(in6_dev->if_flags & IF_RA_MANAGED){ | |
1341 | printk(KERN_INFO "[mtk_net][ipv6]receive RA with m bit!\n"); | |
1342 | in6_dev->cnf.ra_info_flag = 2; | |
1343 | } | |
1344 | if(in6_dev->cnf.ra_info_flag == 0){ | |
1345 | printk(KERN_INFO "[mtk_net][ipv6]receive RA neither O nor M bit is set!\n"); | |
1346 | in6_dev->cnf.ra_info_flag = 4; | |
1347 | } | |
1348 | #endif | |
1349 | ||
31910575 | 1350 | if (ndopts.nd_useropts) { |
61cf46ad YH |
1351 | struct nd_opt_hdr *p; |
1352 | for (p = ndopts.nd_useropts; | |
1353 | p; | |
1354 | p = ndisc_next_useropt(p, ndopts.nd_useropts_end)) { | |
1355 | ndisc_ra_useropt(skb, p); | |
6fa3eb70 S |
1356 | #ifdef CONFIG_MTK_DHCPV6C_WIFI |
1357 | /* only clear ra_info_flag when O bit is set */ | |
1358 | if (p->nd_opt_type == ND_OPT_RDNSS && | |
1359 | in6_dev->if_flags & IF_RA_OTHERCONF) { | |
1360 | printk(KERN_INFO "[mtk_net][ipv6]RDNSS, ignore RA with o bit!\n"); | |
1361 | in6_dev->cnf.ra_info_flag = 0; | |
1362 | } | |
1363 | #endif | |
31910575 PY |
1364 | } |
1365 | } | |
1366 | ||
1da177e4 | 1367 | if (ndopts.nd_opts_tgt_lladdr || ndopts.nd_opts_rh) { |
675418d5 | 1368 | ND_PRINTK(2, warn, "RA: invalid RA options\n"); |
1da177e4 LT |
1369 | } |
1370 | out: | |
94e187c0 | 1371 | ip6_rt_put(rt); |
eb857186 | 1372 | if (neigh) |
1da177e4 | 1373 | neigh_release(neigh); |
1da177e4 LT |
1374 | } |
1375 | ||
1376 | static void ndisc_redirect_rcv(struct sk_buff *skb) | |
1377 | { | |
093d04d4 DJ |
1378 | u8 *hdr; |
1379 | struct ndisc_options ndopts; | |
1380 | struct rd_msg *msg = (struct rd_msg *)skb_transport_header(skb); | |
1381 | u32 ndoptlen = skb->tail - (skb->transport_header + | |
1382 | offsetof(struct rd_msg, opt)); | |
1383 | ||
de357cc0 | 1384 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 TF |
1385 | switch (skb->ndisc_nodetype) { |
1386 | case NDISC_NODETYPE_HOST: | |
1387 | case NDISC_NODETYPE_NODEFAULT: | |
675418d5 JP |
1388 | ND_PRINTK(2, warn, |
1389 | "Redirect: from host or unauthorized router\n"); | |
fadf6bf0 TF |
1390 | return; |
1391 | } | |
de357cc0 | 1392 | #endif |
fadf6bf0 | 1393 | |
0660e03f | 1394 | if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) { |
675418d5 JP |
1395 | ND_PRINTK(2, warn, |
1396 | "Redirect: source address is not link-local\n"); | |
1da177e4 LT |
1397 | return; |
1398 | } | |
1399 | ||
093d04d4 DJ |
1400 | if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) |
1401 | return; | |
1402 | ||
1403 | if (!ndopts.nd_opts_rh) | |
1404 | return; | |
1405 | ||
1406 | hdr = (u8 *)ndopts.nd_opts_rh; | |
1407 | hdr += 8; | |
1408 | if (!pskb_pull(skb, hdr - skb_transport_header(skb))) | |
1409 | return; | |
1410 | ||
b94f1c09 | 1411 | icmpv6_notify(skb, NDISC_REDIRECT, 0, 0); |
1da177e4 LT |
1412 | } |
1413 | ||
5f5a0115 YH |
1414 | static void ndisc_fill_redirect_hdr_option(struct sk_buff *skb, |
1415 | struct sk_buff *orig_skb, | |
1416 | int rd_len) | |
9c86dafe | 1417 | { |
5f5a0115 YH |
1418 | u8 *opt = skb_put(skb, rd_len); |
1419 | ||
9c86dafe YH |
1420 | memset(opt, 0, 8); |
1421 | *(opt++) = ND_OPT_REDIRECT_HDR; | |
1422 | *(opt++) = (rd_len >> 3); | |
1423 | opt += 6; | |
1424 | ||
1425 | memcpy(opt, ipv6_hdr(orig_skb), rd_len - 8); | |
9c86dafe YH |
1426 | } |
1427 | ||
4991969a | 1428 | void ndisc_send_redirect(struct sk_buff *skb, const struct in6_addr *target) |
1da177e4 | 1429 | { |
1762f7e8 | 1430 | struct net_device *dev = skb->dev; |
c346dca1 | 1431 | struct net *net = dev_net(dev); |
1762f7e8 | 1432 | struct sock *sk = net->ipv6.ndisc_sk; |
2ce13576 | 1433 | int optlen = 0; |
fbfe95a4 | 1434 | struct inet_peer *peer; |
1da177e4 | 1435 | struct sk_buff *buff; |
71bcdba0 | 1436 | struct rd_msg *msg; |
1da177e4 | 1437 | struct in6_addr saddr_buf; |
1da177e4 LT |
1438 | struct rt6_info *rt; |
1439 | struct dst_entry *dst; | |
4c9483b2 | 1440 | struct flowi6 fl6; |
1da177e4 | 1441 | int rd_len; |
1da177e4 | 1442 | u8 ha_buf[MAX_ADDR_LEN], *ha = NULL; |
1d861aa4 | 1443 | bool ret; |
1da177e4 | 1444 | |
95c385b4 | 1445 | if (ipv6_get_lladdr(dev, &saddr_buf, IFA_F_TENTATIVE)) { |
675418d5 JP |
1446 | ND_PRINTK(2, warn, "Redirect: no link-local address on %s\n", |
1447 | dev->name); | |
1ab1457c YH |
1448 | return; |
1449 | } | |
1da177e4 | 1450 | |
0660e03f | 1451 | if (!ipv6_addr_equal(&ipv6_hdr(skb)->daddr, target) && |
bf0b48df | 1452 | ipv6_addr_type(target) != (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) { |
675418d5 JP |
1453 | ND_PRINTK(2, warn, |
1454 | "Redirect: target address is not link-local unicast\n"); | |
29556526 LY |
1455 | return; |
1456 | } | |
1457 | ||
4c9483b2 | 1458 | icmpv6_flow_init(sk, &fl6, NDISC_REDIRECT, |
95e41e93 | 1459 | &saddr_buf, &ipv6_hdr(skb)->saddr, dev->ifindex); |
1da177e4 | 1460 | |
4c9483b2 | 1461 | dst = ip6_route_output(net, NULL, &fl6); |
5095d64d RL |
1462 | if (dst->error) { |
1463 | dst_release(dst); | |
1da177e4 | 1464 | return; |
5095d64d | 1465 | } |
4c9483b2 | 1466 | dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), NULL, 0); |
452edd59 | 1467 | if (IS_ERR(dst)) |
1da177e4 | 1468 | return; |
1da177e4 LT |
1469 | |
1470 | rt = (struct rt6_info *) dst; | |
1471 | ||
1472 | if (rt->rt6i_flags & RTF_GATEWAY) { | |
675418d5 JP |
1473 | ND_PRINTK(2, warn, |
1474 | "Redirect: destination is not a neighbour\n"); | |
d73f0801 | 1475 | goto release; |
1da177e4 | 1476 | } |
1d861aa4 DM |
1477 | peer = inet_getpeer_v6(net->ipv6.peers, &rt->rt6i_dst.addr, 1); |
1478 | ret = inet_peer_xrlim_allow(peer, 1*HZ); | |
1479 | if (peer) | |
1480 | inet_putpeer(peer); | |
1481 | if (!ret) | |
d73f0801 | 1482 | goto release; |
1da177e4 LT |
1483 | |
1484 | if (dev->addr_len) { | |
4991969a DM |
1485 | struct neighbour *neigh = dst_neigh_lookup(skb_dst(skb), target); |
1486 | if (!neigh) { | |
675418d5 JP |
1487 | ND_PRINTK(2, warn, |
1488 | "Redirect: no neigh for target address\n"); | |
4991969a DM |
1489 | goto release; |
1490 | } | |
1491 | ||
1da177e4 LT |
1492 | read_lock_bh(&neigh->lock); |
1493 | if (neigh->nud_state & NUD_VALID) { | |
1494 | memcpy(ha_buf, neigh->ha, dev->addr_len); | |
1495 | read_unlock_bh(&neigh->lock); | |
1496 | ha = ha_buf; | |
2ce13576 | 1497 | optlen += ndisc_opt_addr_space(dev); |
1da177e4 LT |
1498 | } else |
1499 | read_unlock_bh(&neigh->lock); | |
4991969a DM |
1500 | |
1501 | neigh_release(neigh); | |
1da177e4 LT |
1502 | } |
1503 | ||
1504 | rd_len = min_t(unsigned int, | |
2ce13576 YH |
1505 | IPV6_MIN_MTU - sizeof(struct ipv6hdr) - sizeof(*msg) - optlen, |
1506 | skb->len + 8); | |
1da177e4 | 1507 | rd_len &= ~0x7; |
2ce13576 | 1508 | optlen += rd_len; |
1da177e4 | 1509 | |
2ce13576 | 1510 | buff = ndisc_alloc_skb(dev, sizeof(*msg) + optlen); |
de09334b | 1511 | if (!buff) |
d73f0801 | 1512 | goto release; |
1da177e4 | 1513 | |
4d5c152e YH |
1514 | msg = (struct rd_msg *)skb_put(buff, sizeof(*msg)); |
1515 | *msg = (struct rd_msg) { | |
1516 | .icmph = { | |
1517 | .icmp6_type = NDISC_REDIRECT, | |
1518 | }, | |
1519 | .target = *target, | |
1520 | .dest = ipv6_hdr(skb)->daddr, | |
1521 | }; | |
1da177e4 | 1522 | |
1da177e4 LT |
1523 | /* |
1524 | * include target_address option | |
1525 | */ | |
1526 | ||
1527 | if (ha) | |
33be081a | 1528 | ndisc_fill_addr_option(buff, ND_OPT_TARGET_LL_ADDR, ha); |
1da177e4 LT |
1529 | |
1530 | /* | |
1531 | * build redirect option and copy skb over to the new packet. | |
1532 | */ | |
1533 | ||
9c86dafe | 1534 | if (rd_len) |
5f5a0115 | 1535 | ndisc_fill_redirect_hdr_option(buff, skb, rd_len); |
1da177e4 | 1536 | |
adf30907 | 1537 | skb_dst_set(buff, dst); |
f4de84c6 | 1538 | ndisc_send_skb(buff, &ipv6_hdr(skb)->saddr, &saddr_buf); |
d73f0801 IJ |
1539 | return; |
1540 | ||
1541 | release: | |
1542 | dst_release(dst); | |
1da177e4 LT |
1543 | } |
1544 | ||
1545 | static void pndisc_redo(struct sk_buff *skb) | |
1546 | { | |
140e26fc | 1547 | ndisc_recv_ns(skb); |
1da177e4 LT |
1548 | kfree_skb(skb); |
1549 | } | |
1550 | ||
1551 | int ndisc_rcv(struct sk_buff *skb) | |
1552 | { | |
1553 | struct nd_msg *msg; | |
1554 | ||
6bce6b4e | 1555 | if (skb_linearize(skb)) |
1da177e4 LT |
1556 | return 0; |
1557 | ||
9c70220b | 1558 | msg = (struct nd_msg *)skb_transport_header(skb); |
1da177e4 | 1559 | |
9c70220b | 1560 | __skb_push(skb, skb->data - skb_transport_header(skb)); |
1da177e4 | 1561 | |
0660e03f | 1562 | if (ipv6_hdr(skb)->hop_limit != 255) { |
675418d5 JP |
1563 | ND_PRINTK(2, warn, "NDISC: invalid hop-limit: %d\n", |
1564 | ipv6_hdr(skb)->hop_limit); | |
1da177e4 LT |
1565 | return 0; |
1566 | } | |
1567 | ||
1568 | if (msg->icmph.icmp6_code != 0) { | |
675418d5 JP |
1569 | ND_PRINTK(2, warn, "NDISC: invalid ICMPv6 code: %d\n", |
1570 | msg->icmph.icmp6_code); | |
1da177e4 LT |
1571 | return 0; |
1572 | } | |
1573 | ||
a61bbcf2 | 1574 | memset(NEIGH_CB(skb), 0, sizeof(struct neighbour_cb)); |
6fa3eb70 | 1575 | |
1da177e4 LT |
1576 | switch (msg->icmph.icmp6_type) { |
1577 | case NDISC_NEIGHBOUR_SOLICITATION: | |
1578 | ndisc_recv_ns(skb); | |
1579 | break; | |
1580 | ||
1581 | case NDISC_NEIGHBOUR_ADVERTISEMENT: | |
1582 | ndisc_recv_na(skb); | |
1583 | break; | |
1584 | ||
1585 | case NDISC_ROUTER_SOLICITATION: | |
1586 | ndisc_recv_rs(skb); | |
1587 | break; | |
1588 | ||
1589 | case NDISC_ROUTER_ADVERTISEMENT: | |
1590 | ndisc_router_discovery(skb); | |
1591 | break; | |
1592 | ||
1593 | case NDISC_REDIRECT: | |
1594 | ndisc_redirect_rcv(skb); | |
1595 | break; | |
3ff50b79 | 1596 | } |
1da177e4 LT |
1597 | |
1598 | return 0; | |
1599 | } | |
1600 | ||
1601 | static int ndisc_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1602 | { | |
1603 | struct net_device *dev = ptr; | |
c346dca1 | 1604 | struct net *net = dev_net(dev); |
5cb04436 | 1605 | struct inet6_dev *idev; |
1da177e4 LT |
1606 | |
1607 | switch (event) { | |
1608 | case NETDEV_CHANGEADDR: | |
1609 | neigh_changeaddr(&nd_tbl, dev); | |
ba310bc8 | 1610 | fib6_run_gc(0, net, false); |
5cb04436 HFS |
1611 | idev = in6_dev_get(dev); |
1612 | if (!idev) | |
1613 | break; | |
1614 | if (idev->cnf.ndisc_notify) | |
1615 | ndisc_send_unsol_na(dev); | |
1616 | in6_dev_put(idev); | |
1da177e4 LT |
1617 | break; |
1618 | case NETDEV_DOWN: | |
1619 | neigh_ifdown(&nd_tbl, dev); | |
ba310bc8 | 1620 | fib6_run_gc(0, net, false); |
1da177e4 | 1621 | break; |
f47b9464 BH |
1622 | case NETDEV_NOTIFY_PEERS: |
1623 | ndisc_send_unsol_na(dev); | |
1624 | break; | |
1da177e4 LT |
1625 | default: |
1626 | break; | |
1627 | } | |
1628 | ||
1629 | return NOTIFY_DONE; | |
1630 | } | |
1631 | ||
1632 | static struct notifier_block ndisc_netdev_notifier = { | |
1633 | .notifier_call = ndisc_netdev_event, | |
1634 | }; | |
1635 | ||
1636 | #ifdef CONFIG_SYSCTL | |
1637 | static void ndisc_warn_deprecated_sysctl(struct ctl_table *ctl, | |
1638 | const char *func, const char *dev_name) | |
1639 | { | |
1640 | static char warncomm[TASK_COMM_LEN]; | |
1641 | static int warned; | |
1642 | if (strcmp(warncomm, current->comm) && warned < 5) { | |
1643 | strcpy(warncomm, current->comm); | |
f3213831 | 1644 | 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 |
1645 | warncomm, func, |
1646 | dev_name, ctl->procname, | |
1647 | dev_name, ctl->procname); | |
1648 | warned++; | |
1649 | } | |
1650 | } | |
1651 | ||
8d65af78 | 1652 | int ndisc_ifinfo_sysctl_change(struct ctl_table *ctl, int write, void __user *buffer, size_t *lenp, loff_t *ppos) |
1da177e4 LT |
1653 | { |
1654 | struct net_device *dev = ctl->extra1; | |
1655 | struct inet6_dev *idev; | |
1656 | int ret; | |
1657 | ||
d12af679 EB |
1658 | if ((strcmp(ctl->procname, "retrans_time") == 0) || |
1659 | (strcmp(ctl->procname, "base_reachable_time") == 0)) | |
1da177e4 LT |
1660 | ndisc_warn_deprecated_sysctl(ctl, "syscall", dev ? dev->name : "default"); |
1661 | ||
d12af679 | 1662 | if (strcmp(ctl->procname, "retrans_time") == 0) |
8d65af78 | 1663 | ret = proc_dointvec(ctl, write, buffer, lenp, ppos); |
d12af679 EB |
1664 | |
1665 | else if (strcmp(ctl->procname, "base_reachable_time") == 0) | |
1da177e4 | 1666 | ret = proc_dointvec_jiffies(ctl, write, |
8d65af78 | 1667 | buffer, lenp, ppos); |
d12af679 EB |
1668 | |
1669 | else if ((strcmp(ctl->procname, "retrans_time_ms") == 0) || | |
ad02ac14 | 1670 | (strcmp(ctl->procname, "base_reachable_time_ms") == 0)) |
1da177e4 | 1671 | ret = proc_dointvec_ms_jiffies(ctl, write, |
8d65af78 | 1672 | buffer, lenp, ppos); |
d12af679 | 1673 | else |
1da177e4 | 1674 | ret = -1; |
1da177e4 LT |
1675 | |
1676 | if (write && ret == 0 && dev && (idev = in6_dev_get(dev)) != NULL) { | |
d12af679 | 1677 | if (ctl->data == &idev->nd_parms->base_reachable_time) |
1da177e4 LT |
1678 | idev->nd_parms->reachable_time = neigh_rand_reach_time(idev->nd_parms->base_reachable_time); |
1679 | idev->tstamp = jiffies; | |
1680 | inet6_ifinfo_notify(RTM_NEWLINK, idev); | |
1681 | in6_dev_put(idev); | |
1682 | } | |
1683 | return ret; | |
1684 | } | |
1685 | ||
1da177e4 LT |
1686 | |
1687 | #endif | |
1688 | ||
2c8c1e72 | 1689 | static int __net_init ndisc_net_init(struct net *net) |
1da177e4 LT |
1690 | { |
1691 | struct ipv6_pinfo *np; | |
1692 | struct sock *sk; | |
1ab1457c | 1693 | int err; |
1da177e4 | 1694 | |
1ed8516f DL |
1695 | err = inet_ctl_sock_create(&sk, PF_INET6, |
1696 | SOCK_RAW, IPPROTO_ICMPV6, net); | |
1da177e4 | 1697 | if (err < 0) { |
675418d5 JP |
1698 | ND_PRINTK(0, err, |
1699 | "NDISC: Failed to initialize the control socket (err %d)\n", | |
1700 | err); | |
1da177e4 LT |
1701 | return err; |
1702 | } | |
1703 | ||
1ed8516f | 1704 | net->ipv6.ndisc_sk = sk; |
1762f7e8 | 1705 | |
1da177e4 | 1706 | np = inet6_sk(sk); |
1da177e4 LT |
1707 | np->hop_limit = 255; |
1708 | /* Do not loopback ndisc messages */ | |
1709 | np->mc_loop = 0; | |
1da177e4 | 1710 | |
1762f7e8 DL |
1711 | return 0; |
1712 | } | |
1713 | ||
2c8c1e72 | 1714 | static void __net_exit ndisc_net_exit(struct net *net) |
1762f7e8 | 1715 | { |
1ed8516f | 1716 | inet_ctl_sock_destroy(net->ipv6.ndisc_sk); |
1762f7e8 DL |
1717 | } |
1718 | ||
1719 | static struct pernet_operations ndisc_net_ops = { | |
1720 | .init = ndisc_net_init, | |
1721 | .exit = ndisc_net_exit, | |
1722 | }; | |
1723 | ||
1724 | int __init ndisc_init(void) | |
1725 | { | |
1726 | int err; | |
1727 | ||
1728 | err = register_pernet_subsys(&ndisc_net_ops); | |
1729 | if (err) | |
1730 | return err; | |
1ab1457c YH |
1731 | /* |
1732 | * Initialize the neighbour table | |
1733 | */ | |
1da177e4 LT |
1734 | neigh_table_init(&nd_tbl); |
1735 | ||
1736 | #ifdef CONFIG_SYSCTL | |
54716e3b | 1737 | err = neigh_sysctl_register(NULL, &nd_tbl.parms, "ipv6", |
f8572d8f | 1738 | &ndisc_ifinfo_sysctl_change); |
1762f7e8 DL |
1739 | if (err) |
1740 | goto out_unregister_pernet; | |
1da177e4 | 1741 | #endif |
1762f7e8 DL |
1742 | err = register_netdevice_notifier(&ndisc_netdev_notifier); |
1743 | if (err) | |
1744 | goto out_unregister_sysctl; | |
1745 | out: | |
1746 | return err; | |
1da177e4 | 1747 | |
1762f7e8 DL |
1748 | out_unregister_sysctl: |
1749 | #ifdef CONFIG_SYSCTL | |
1750 | neigh_sysctl_unregister(&nd_tbl.parms); | |
1751 | out_unregister_pernet: | |
1752 | #endif | |
1753 | unregister_pernet_subsys(&ndisc_net_ops); | |
1754 | goto out; | |
1da177e4 LT |
1755 | } |
1756 | ||
1757 | void ndisc_cleanup(void) | |
1758 | { | |
36f73d0c | 1759 | unregister_netdevice_notifier(&ndisc_netdev_notifier); |
1da177e4 LT |
1760 | #ifdef CONFIG_SYSCTL |
1761 | neigh_sysctl_unregister(&nd_tbl.parms); | |
1762 | #endif | |
1763 | neigh_table_clear(&nd_tbl); | |
1762f7e8 | 1764 | unregister_pernet_subsys(&ndisc_net_ops); |
1da177e4 | 1765 | } |