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> |
ca254490 | 70 | #include <net/l3mdev.h> |
1da177e4 LT |
71 | #include <linux/proc_fs.h> |
72 | ||
73 | #include <linux/netfilter.h> | |
74 | #include <linux/netfilter_ipv6.h> | |
75 | ||
675418d5 JP |
76 | /* Set to 3 to get tracing... */ |
77 | #define ND_DEBUG 1 | |
78 | ||
79 | #define ND_PRINTK(val, level, fmt, ...) \ | |
80 | do { \ | |
81 | if (val <= ND_DEBUG) \ | |
82 | net_##level##_ratelimited(fmt, ##__VA_ARGS__); \ | |
83 | } while (0) | |
84 | ||
d6bf7817 ED |
85 | static u32 ndisc_hash(const void *pkey, |
86 | const struct net_device *dev, | |
2c2aba6c | 87 | __u32 *hash_rnd); |
60395a20 | 88 | static bool ndisc_key_eq(const struct neighbour *neigh, const void *pkey); |
1da177e4 LT |
89 | static int ndisc_constructor(struct neighbour *neigh); |
90 | static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb); | |
91 | static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb); | |
92 | static int pndisc_constructor(struct pneigh_entry *n); | |
93 | static void pndisc_destructor(struct pneigh_entry *n); | |
94 | static void pndisc_redo(struct sk_buff *skb); | |
95 | ||
89d69d2b | 96 | static const struct neigh_ops ndisc_generic_ops = { |
1da177e4 LT |
97 | .family = AF_INET6, |
98 | .solicit = ndisc_solicit, | |
99 | .error_report = ndisc_error_report, | |
100 | .output = neigh_resolve_output, | |
101 | .connected_output = neigh_connected_output, | |
1da177e4 LT |
102 | }; |
103 | ||
89d69d2b | 104 | static const struct neigh_ops ndisc_hh_ops = { |
1da177e4 LT |
105 | .family = AF_INET6, |
106 | .solicit = ndisc_solicit, | |
107 | .error_report = ndisc_error_report, | |
108 | .output = neigh_resolve_output, | |
109 | .connected_output = neigh_resolve_output, | |
1da177e4 LT |
110 | }; |
111 | ||
112 | ||
89d69d2b | 113 | static const struct neigh_ops ndisc_direct_ops = { |
1da177e4 | 114 | .family = AF_INET6, |
8f40b161 DM |
115 | .output = neigh_direct_output, |
116 | .connected_output = neigh_direct_output, | |
1da177e4 LT |
117 | }; |
118 | ||
119 | struct neigh_table nd_tbl = { | |
120 | .family = AF_INET6, | |
1da177e4 | 121 | .key_len = sizeof(struct in6_addr), |
bdf53c58 | 122 | .protocol = cpu_to_be16(ETH_P_IPV6), |
1da177e4 | 123 | .hash = ndisc_hash, |
60395a20 | 124 | .key_eq = ndisc_key_eq, |
1da177e4 LT |
125 | .constructor = ndisc_constructor, |
126 | .pconstructor = pndisc_constructor, | |
127 | .pdestructor = pndisc_destructor, | |
128 | .proxy_redo = pndisc_redo, | |
129 | .id = "ndisc_cache", | |
130 | .parms = { | |
b672083e | 131 | .tbl = &nd_tbl, |
b672083e | 132 | .reachable_time = ND_REACHABLE_TIME, |
1f9248e5 JP |
133 | .data = { |
134 | [NEIGH_VAR_MCAST_PROBES] = 3, | |
135 | [NEIGH_VAR_UCAST_PROBES] = 3, | |
136 | [NEIGH_VAR_RETRANS_TIME] = ND_RETRANS_TIMER, | |
137 | [NEIGH_VAR_BASE_REACHABLE_TIME] = ND_REACHABLE_TIME, | |
138 | [NEIGH_VAR_DELAY_PROBE_TIME] = 5 * HZ, | |
139 | [NEIGH_VAR_GC_STALETIME] = 60 * HZ, | |
140 | [NEIGH_VAR_QUEUE_LEN_BYTES] = 64 * 1024, | |
141 | [NEIGH_VAR_PROXY_QLEN] = 64, | |
142 | [NEIGH_VAR_ANYCAST_DELAY] = 1 * HZ, | |
143 | [NEIGH_VAR_PROXY_DELAY] = (8 * HZ) / 10, | |
144 | }, | |
1da177e4 LT |
145 | }, |
146 | .gc_interval = 30 * HZ, | |
147 | .gc_thresh1 = 128, | |
148 | .gc_thresh2 = 512, | |
149 | .gc_thresh3 = 1024, | |
150 | }; | |
c4850687 | 151 | EXPORT_SYMBOL_GPL(nd_tbl); |
1da177e4 | 152 | |
5f5a0115 | 153 | static void ndisc_fill_addr_option(struct sk_buff *skb, int type, void *data) |
1da177e4 | 154 | { |
5f5a0115 YH |
155 | int pad = ndisc_addr_option_pad(skb->dev->type); |
156 | int data_len = skb->dev->addr_len; | |
157 | int space = ndisc_opt_addr_space(skb->dev); | |
158 | u8 *opt = skb_put(skb, space); | |
1da177e4 LT |
159 | |
160 | opt[0] = type; | |
161 | opt[1] = space>>3; | |
162 | ||
163 | memset(opt + 2, 0, pad); | |
164 | opt += pad; | |
165 | space -= pad; | |
166 | ||
167 | memcpy(opt+2, data, data_len); | |
168 | data_len += 2; | |
169 | opt += data_len; | |
e5d08d71 IM |
170 | space -= data_len; |
171 | if (space > 0) | |
1da177e4 | 172 | memset(opt, 0, space); |
1da177e4 LT |
173 | } |
174 | ||
175 | static struct nd_opt_hdr *ndisc_next_option(struct nd_opt_hdr *cur, | |
176 | struct nd_opt_hdr *end) | |
177 | { | |
178 | int type; | |
179 | if (!cur || !end || cur >= end) | |
180 | return NULL; | |
181 | type = cur->nd_opt_type; | |
182 | do { | |
183 | cur = ((void *)cur) + (cur->nd_opt_len << 3); | |
67ba4152 | 184 | } while (cur < end && cur->nd_opt_type != type); |
a02cec21 | 185 | return cur <= end && cur->nd_opt_type == type ? cur : NULL; |
1da177e4 LT |
186 | } |
187 | ||
31910575 PY |
188 | static inline int ndisc_is_useropt(struct nd_opt_hdr *opt) |
189 | { | |
e35f30c1 AF |
190 | return opt->nd_opt_type == ND_OPT_RDNSS || |
191 | opt->nd_opt_type == ND_OPT_DNSSL; | |
31910575 PY |
192 | } |
193 | ||
194 | static struct nd_opt_hdr *ndisc_next_useropt(struct nd_opt_hdr *cur, | |
195 | struct nd_opt_hdr *end) | |
196 | { | |
197 | if (!cur || !end || cur >= end) | |
198 | return NULL; | |
199 | do { | |
200 | cur = ((void *)cur) + (cur->nd_opt_len << 3); | |
67ba4152 | 201 | } while (cur < end && !ndisc_is_useropt(cur)); |
a02cec21 | 202 | return cur <= end && ndisc_is_useropt(cur) ? cur : NULL; |
31910575 PY |
203 | } |
204 | ||
30f2a5f3 DM |
205 | struct ndisc_options *ndisc_parse_options(u8 *opt, int opt_len, |
206 | struct ndisc_options *ndopts) | |
1da177e4 LT |
207 | { |
208 | struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)opt; | |
209 | ||
210 | if (!nd_opt || opt_len < 0 || !ndopts) | |
211 | return NULL; | |
212 | memset(ndopts, 0, sizeof(*ndopts)); | |
213 | while (opt_len) { | |
214 | int l; | |
215 | if (opt_len < sizeof(struct nd_opt_hdr)) | |
216 | return NULL; | |
217 | l = nd_opt->nd_opt_len << 3; | |
218 | if (opt_len < l || l == 0) | |
219 | return NULL; | |
220 | switch (nd_opt->nd_opt_type) { | |
221 | case ND_OPT_SOURCE_LL_ADDR: | |
222 | case ND_OPT_TARGET_LL_ADDR: | |
223 | case ND_OPT_MTU: | |
224 | case ND_OPT_REDIRECT_HDR: | |
225 | if (ndopts->nd_opt_array[nd_opt->nd_opt_type]) { | |
675418d5 JP |
226 | ND_PRINTK(2, warn, |
227 | "%s: duplicated ND6 option found: type=%d\n", | |
228 | __func__, nd_opt->nd_opt_type); | |
1da177e4 LT |
229 | } else { |
230 | ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt; | |
231 | } | |
232 | break; | |
233 | case ND_OPT_PREFIX_INFO: | |
234 | ndopts->nd_opts_pi_end = nd_opt; | |
cfcabdcc | 235 | if (!ndopts->nd_opt_array[nd_opt->nd_opt_type]) |
1da177e4 LT |
236 | ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt; |
237 | break; | |
70ceb4f5 YH |
238 | #ifdef CONFIG_IPV6_ROUTE_INFO |
239 | case ND_OPT_ROUTE_INFO: | |
240 | ndopts->nd_opts_ri_end = nd_opt; | |
241 | if (!ndopts->nd_opts_ri) | |
242 | ndopts->nd_opts_ri = nd_opt; | |
243 | break; | |
244 | #endif | |
1da177e4 | 245 | default: |
31910575 PY |
246 | if (ndisc_is_useropt(nd_opt)) { |
247 | ndopts->nd_useropts_end = nd_opt; | |
248 | if (!ndopts->nd_useropts) | |
249 | ndopts->nd_useropts = nd_opt; | |
250 | } else { | |
251 | /* | |
252 | * Unknown options must be silently ignored, | |
253 | * to accommodate future extension to the | |
254 | * protocol. | |
255 | */ | |
675418d5 JP |
256 | ND_PRINTK(2, notice, |
257 | "%s: ignored unsupported option; type=%d, len=%d\n", | |
258 | __func__, | |
259 | nd_opt->nd_opt_type, | |
260 | nd_opt->nd_opt_len); | |
31910575 | 261 | } |
1da177e4 LT |
262 | } |
263 | opt_len -= l; | |
264 | nd_opt = ((void *)nd_opt) + l; | |
265 | } | |
266 | return ndopts; | |
267 | } | |
268 | ||
b71d1d42 | 269 | int ndisc_mc_map(const struct in6_addr *addr, char *buf, struct net_device *dev, int dir) |
1da177e4 LT |
270 | { |
271 | switch (dev->type) { | |
272 | case ARPHRD_ETHER: | |
273 | case ARPHRD_IEEE802: /* Not sure. Check it later. --ANK */ | |
274 | case ARPHRD_FDDI: | |
275 | ipv6_eth_mc_map(addr, buf); | |
276 | return 0; | |
1da177e4 LT |
277 | case ARPHRD_ARCNET: |
278 | ipv6_arcnet_mc_map(addr, buf); | |
279 | return 0; | |
280 | case ARPHRD_INFINIBAND: | |
a9e527e3 | 281 | ipv6_ib_mc_map(addr, dev->broadcast, buf); |
1da177e4 | 282 | return 0; |
93ca3bb5 TT |
283 | case ARPHRD_IPGRE: |
284 | return ipv6_ipgre_mc_map(addr, dev->broadcast, buf); | |
1da177e4 LT |
285 | default: |
286 | if (dir) { | |
287 | memcpy(buf, dev->broadcast, dev->addr_len); | |
288 | return 0; | |
289 | } | |
290 | } | |
291 | return -EINVAL; | |
292 | } | |
7159039a YH |
293 | EXPORT_SYMBOL(ndisc_mc_map); |
294 | ||
d6bf7817 ED |
295 | static u32 ndisc_hash(const void *pkey, |
296 | const struct net_device *dev, | |
2c2aba6c | 297 | __u32 *hash_rnd) |
1da177e4 | 298 | { |
2c2aba6c | 299 | return ndisc_hashfn(pkey, dev, hash_rnd); |
1da177e4 LT |
300 | } |
301 | ||
60395a20 EB |
302 | static bool ndisc_key_eq(const struct neighbour *n, const void *pkey) |
303 | { | |
304 | return neigh_key_eq128(n, pkey); | |
305 | } | |
306 | ||
1da177e4 LT |
307 | static int ndisc_constructor(struct neighbour *neigh) |
308 | { | |
67ba4152 | 309 | struct in6_addr *addr = (struct in6_addr *)&neigh->primary_key; |
1da177e4 LT |
310 | struct net_device *dev = neigh->dev; |
311 | struct inet6_dev *in6_dev; | |
312 | struct neigh_parms *parms; | |
a50feda5 | 313 | bool is_multicast = ipv6_addr_is_multicast(addr); |
1da177e4 | 314 | |
1da177e4 | 315 | in6_dev = in6_dev_get(dev); |
63159f29 | 316 | if (!in6_dev) { |
1da177e4 LT |
317 | return -EINVAL; |
318 | } | |
319 | ||
320 | parms = in6_dev->nd_parms; | |
321 | __neigh_parms_put(neigh->parms); | |
322 | neigh->parms = neigh_parms_clone(parms); | |
1da177e4 LT |
323 | |
324 | neigh->type = is_multicast ? RTN_MULTICAST : RTN_UNICAST; | |
3b04ddde | 325 | if (!dev->header_ops) { |
1da177e4 LT |
326 | neigh->nud_state = NUD_NOARP; |
327 | neigh->ops = &ndisc_direct_ops; | |
8f40b161 | 328 | neigh->output = neigh_direct_output; |
1da177e4 LT |
329 | } else { |
330 | if (is_multicast) { | |
331 | neigh->nud_state = NUD_NOARP; | |
332 | ndisc_mc_map(addr, neigh->ha, dev, 1); | |
333 | } else if (dev->flags&(IFF_NOARP|IFF_LOOPBACK)) { | |
334 | neigh->nud_state = NUD_NOARP; | |
335 | memcpy(neigh->ha, dev->dev_addr, dev->addr_len); | |
336 | if (dev->flags&IFF_LOOPBACK) | |
337 | neigh->type = RTN_LOCAL; | |
338 | } else if (dev->flags&IFF_POINTOPOINT) { | |
339 | neigh->nud_state = NUD_NOARP; | |
340 | memcpy(neigh->ha, dev->broadcast, dev->addr_len); | |
341 | } | |
3b04ddde | 342 | if (dev->header_ops->cache) |
1da177e4 LT |
343 | neigh->ops = &ndisc_hh_ops; |
344 | else | |
345 | neigh->ops = &ndisc_generic_ops; | |
346 | if (neigh->nud_state&NUD_VALID) | |
347 | neigh->output = neigh->ops->connected_output; | |
348 | else | |
349 | neigh->output = neigh->ops->output; | |
350 | } | |
351 | in6_dev_put(in6_dev); | |
352 | return 0; | |
353 | } | |
354 | ||
355 | static int pndisc_constructor(struct pneigh_entry *n) | |
356 | { | |
67ba4152 | 357 | struct in6_addr *addr = (struct in6_addr *)&n->key; |
1da177e4 LT |
358 | struct in6_addr maddr; |
359 | struct net_device *dev = n->dev; | |
360 | ||
63159f29 | 361 | if (!dev || !__in6_dev_get(dev)) |
1da177e4 LT |
362 | return -EINVAL; |
363 | addrconf_addr_solict_mult(addr, &maddr); | |
364 | ipv6_dev_mc_inc(dev, &maddr); | |
365 | return 0; | |
366 | } | |
367 | ||
368 | static void pndisc_destructor(struct pneigh_entry *n) | |
369 | { | |
67ba4152 | 370 | struct in6_addr *addr = (struct in6_addr *)&n->key; |
1da177e4 LT |
371 | struct in6_addr maddr; |
372 | struct net_device *dev = n->dev; | |
373 | ||
63159f29 | 374 | if (!dev || !__in6_dev_get(dev)) |
1da177e4 LT |
375 | return; |
376 | addrconf_addr_solict_mult(addr, &maddr); | |
377 | ipv6_dev_mc_dec(dev, &maddr); | |
378 | } | |
379 | ||
de09334b YH |
380 | static struct sk_buff *ndisc_alloc_skb(struct net_device *dev, |
381 | int len) | |
382 | { | |
383 | int hlen = LL_RESERVED_SPACE(dev); | |
384 | int tlen = dev->needed_tailroom; | |
385 | struct sock *sk = dev_net(dev)->ipv6.ndisc_sk; | |
386 | struct sk_buff *skb; | |
de09334b | 387 | |
25a6e6b8 | 388 | skb = alloc_skb(hlen + sizeof(struct ipv6hdr) + len + tlen, GFP_ATOMIC); |
de09334b | 389 | if (!skb) { |
25a6e6b8 TG |
390 | ND_PRINTK(0, err, "ndisc: %s failed to allocate an skb\n", |
391 | __func__); | |
de09334b YH |
392 | return NULL; |
393 | } | |
394 | ||
f382d03a YH |
395 | skb->protocol = htons(ETH_P_IPV6); |
396 | skb->dev = dev; | |
397 | ||
527a150f | 398 | skb_reserve(skb, hlen + sizeof(struct ipv6hdr)); |
5135e633 | 399 | skb_reset_transport_header(skb); |
de09334b | 400 | |
25a6e6b8 TG |
401 | /* Manually assign socket ownership as we avoid calling |
402 | * sock_alloc_send_pskb() to bypass wmem buffer limits | |
403 | */ | |
404 | skb_set_owner_w(skb, sk); | |
405 | ||
de09334b YH |
406 | return skb; |
407 | } | |
408 | ||
f382d03a | 409 | static void ip6_nd_hdr(struct sk_buff *skb, |
2576f17d YH |
410 | const struct in6_addr *saddr, |
411 | const struct in6_addr *daddr, | |
c8d6c380 | 412 | int hop_limit, int len) |
2576f17d YH |
413 | { |
414 | struct ipv6hdr *hdr; | |
415 | ||
527a150f | 416 | skb_push(skb, sizeof(*hdr)); |
2576f17d | 417 | skb_reset_network_header(skb); |
2576f17d YH |
418 | hdr = ipv6_hdr(skb); |
419 | ||
420 | ip6_flow_hdr(hdr, 0, 0); | |
421 | ||
422 | hdr->payload_len = htons(len); | |
c8d6c380 YH |
423 | hdr->nexthdr = IPPROTO_ICMPV6; |
424 | hdr->hop_limit = hop_limit; | |
2576f17d YH |
425 | |
426 | hdr->saddr = *saddr; | |
427 | hdr->daddr = *daddr; | |
428 | } | |
429 | ||
af9a9976 | 430 | static void ndisc_send_skb(struct sk_buff *skb, |
fd0ea7db | 431 | const struct in6_addr *daddr, |
aa4bdd4b | 432 | const struct in6_addr *saddr) |
305d552a | 433 | { |
f4de84c6 | 434 | struct dst_entry *dst = skb_dst(skb); |
af9a9976 | 435 | struct net *net = dev_net(skb->dev); |
7b3d9b06 | 436 | struct sock *sk = net->ipv6.ndisc_sk; |
305d552a BH |
437 | struct inet6_dev *idev; |
438 | int err; | |
aa4bdd4b | 439 | struct icmp6hdr *icmp6h = icmp6_hdr(skb); |
305d552a BH |
440 | u8 type; |
441 | ||
442 | type = icmp6h->icmp6_type; | |
443 | ||
f4de84c6 | 444 | if (!dst) { |
f4de84c6 | 445 | struct flowi6 fl6; |
ca254490 | 446 | int oif = l3mdev_fib_oif(skb->dev); |
305d552a | 447 | |
ca254490 DA |
448 | icmpv6_flow_init(sk, &fl6, type, saddr, daddr, oif); |
449 | if (oif != skb->dev->ifindex) | |
450 | fl6.flowi6_flags |= FLOWI_FLAG_L3MDEV_SRC; | |
f4de84c6 YH |
451 | dst = icmp6_dst_alloc(skb->dev, &fl6); |
452 | if (IS_ERR(dst)) { | |
453 | kfree_skb(skb); | |
454 | return; | |
455 | } | |
456 | ||
457 | skb_dst_set(skb, dst); | |
458 | } | |
e1ec7842 | 459 | |
7b3d9b06 YH |
460 | icmp6h->icmp6_cksum = csum_ipv6_magic(saddr, daddr, skb->len, |
461 | IPPROTO_ICMPV6, | |
462 | csum_partial(icmp6h, | |
463 | skb->len, 0)); | |
464 | ||
465 | ip6_nd_hdr(skb, saddr, daddr, inet6_sk(sk)->hop_limit, skb->len); | |
466 | ||
cfdf7647 ED |
467 | rcu_read_lock(); |
468 | idev = __in6_dev_get(dst->dev); | |
edf391ff | 469 | IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len); |
e1ec7842 | 470 | |
29a26a56 EB |
471 | err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, |
472 | net, sk, skb, NULL, dst->dev, | |
13206b6b | 473 | dst_output); |
1da177e4 | 474 | if (!err) { |
5c5d244b | 475 | ICMP6MSGOUT_INC_STATS(net, idev, type); |
a862f6a6 | 476 | ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); |
1da177e4 LT |
477 | } |
478 | ||
cfdf7647 | 479 | rcu_read_unlock(); |
1ab1457c | 480 | } |
1da177e4 | 481 | |
38cf595b | 482 | void ndisc_send_na(struct net_device *dev, const struct in6_addr *daddr, |
f564f45c CW |
483 | const struct in6_addr *solicited_addr, |
484 | bool router, bool solicited, bool override, bool inc_opt) | |
e1ec7842 | 485 | { |
b44b5f4a | 486 | struct sk_buff *skb; |
e1ec7842 YH |
487 | struct in6_addr tmpaddr; |
488 | struct inet6_ifaddr *ifp; | |
9acd9f3a | 489 | const struct in6_addr *src_addr; |
1cb3fe51 YH |
490 | struct nd_msg *msg; |
491 | int optlen = 0; | |
e1ec7842 YH |
492 | |
493 | /* for anycast or proxy, solicited_addr != src_addr */ | |
c346dca1 | 494 | ifp = ipv6_get_ifaddr(dev_net(dev), solicited_addr, dev, 1); |
e1ec7842 YH |
495 | if (ifp) { |
496 | src_addr = solicited_addr; | |
497 | if (ifp->flags & IFA_F_OPTIMISTIC) | |
f2f79cca | 498 | override = false; |
9f888160 | 499 | inc_opt |= ifp->idev->cnf.force_tllao; |
e1ec7842 YH |
500 | in6_ifa_put(ifp); |
501 | } else { | |
191cd582 | 502 | if (ipv6_dev_get_saddr(dev_net(dev), dev, daddr, |
c346dca1 | 503 | inet6_sk(dev_net(dev)->ipv6.ndisc_sk)->srcprefs, |
7cbca67c | 504 | &tmpaddr)) |
e1ec7842 YH |
505 | return; |
506 | src_addr = &tmpaddr; | |
507 | } | |
508 | ||
1cb3fe51 YH |
509 | if (!dev->addr_len) |
510 | inc_opt = 0; | |
511 | if (inc_opt) | |
512 | optlen += ndisc_opt_addr_space(dev); | |
e1ec7842 | 513 | |
1cb3fe51 | 514 | skb = ndisc_alloc_skb(dev, sizeof(*msg) + optlen); |
b44b5f4a YH |
515 | if (!skb) |
516 | return; | |
517 | ||
1cb3fe51 YH |
518 | msg = (struct nd_msg *)skb_put(skb, sizeof(*msg)); |
519 | *msg = (struct nd_msg) { | |
520 | .icmph = { | |
521 | .icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT, | |
522 | .icmp6_router = router, | |
523 | .icmp6_solicited = solicited, | |
524 | .icmp6_override = override, | |
525 | }, | |
526 | .target = *solicited_addr, | |
527 | }; | |
528 | ||
529 | if (inc_opt) | |
530 | ndisc_fill_addr_option(skb, ND_OPT_TARGET_LL_ADDR, | |
531 | dev->dev_addr); | |
532 | ||
533 | ||
b44b5f4a | 534 | ndisc_send_skb(skb, daddr, src_addr); |
e1ec7842 YH |
535 | } |
536 | ||
f47b9464 BH |
537 | static void ndisc_send_unsol_na(struct net_device *dev) |
538 | { | |
539 | struct inet6_dev *idev; | |
540 | struct inet6_ifaddr *ifa; | |
f47b9464 BH |
541 | |
542 | idev = in6_dev_get(dev); | |
543 | if (!idev) | |
544 | return; | |
545 | ||
546 | read_lock_bh(&idev->lock); | |
547 | list_for_each_entry(ifa, &idev->addr_list, if_list) { | |
38cf595b | 548 | ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifa->addr, |
f47b9464 BH |
549 | /*router=*/ !!idev->cnf.forwarding, |
550 | /*solicited=*/ false, /*override=*/ true, | |
551 | /*inc_opt=*/ true); | |
552 | } | |
553 | read_unlock_bh(&idev->lock); | |
554 | ||
555 | in6_dev_put(idev); | |
556 | } | |
557 | ||
38cf595b | 558 | void ndisc_send_ns(struct net_device *dev, const struct in6_addr *solicit, |
ab450605 JB |
559 | const struct in6_addr *daddr, const struct in6_addr *saddr, |
560 | struct sk_buff *oskb) | |
1da177e4 | 561 | { |
b44b5f4a | 562 | struct sk_buff *skb; |
1da177e4 | 563 | struct in6_addr addr_buf; |
1cb3fe51 YH |
564 | int inc_opt = dev->addr_len; |
565 | int optlen = 0; | |
566 | struct nd_msg *msg; | |
1da177e4 | 567 | |
63159f29 | 568 | if (!saddr) { |
95c385b4 NH |
569 | if (ipv6_get_lladdr(dev, &addr_buf, |
570 | (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC))) | |
1da177e4 LT |
571 | return; |
572 | saddr = &addr_buf; | |
573 | } | |
574 | ||
1cb3fe51 | 575 | if (ipv6_addr_any(saddr)) |
f2f79cca | 576 | inc_opt = false; |
1cb3fe51 YH |
577 | if (inc_opt) |
578 | optlen += ndisc_opt_addr_space(dev); | |
579 | ||
580 | skb = ndisc_alloc_skb(dev, sizeof(*msg) + optlen); | |
b44b5f4a YH |
581 | if (!skb) |
582 | return; | |
583 | ||
1cb3fe51 YH |
584 | msg = (struct nd_msg *)skb_put(skb, sizeof(*msg)); |
585 | *msg = (struct nd_msg) { | |
586 | .icmph = { | |
587 | .icmp6_type = NDISC_NEIGHBOUR_SOLICITATION, | |
588 | }, | |
589 | .target = *solicit, | |
590 | }; | |
591 | ||
592 | if (inc_opt) | |
593 | ndisc_fill_addr_option(skb, ND_OPT_SOURCE_LL_ADDR, | |
594 | dev->dev_addr); | |
595 | ||
ab450605 JB |
596 | if (!(dev->priv_flags & IFF_XMIT_DST_RELEASE) && oskb) |
597 | skb_dst_copy(skb, oskb); | |
598 | ||
b44b5f4a | 599 | ndisc_send_skb(skb, daddr, saddr); |
1da177e4 LT |
600 | } |
601 | ||
9acd9f3a YH |
602 | void ndisc_send_rs(struct net_device *dev, const struct in6_addr *saddr, |
603 | const struct in6_addr *daddr) | |
1da177e4 | 604 | { |
b44b5f4a | 605 | struct sk_buff *skb; |
1cb3fe51 | 606 | struct rs_msg *msg; |
95c385b4 | 607 | int send_sllao = dev->addr_len; |
1cb3fe51 | 608 | int optlen = 0; |
95c385b4 NH |
609 | |
610 | #ifdef CONFIG_IPV6_OPTIMISTIC_DAD | |
611 | /* | |
612 | * According to section 2.2 of RFC 4429, we must not | |
613 | * send router solicitations with a sllao from | |
614 | * optimistic addresses, but we may send the solicitation | |
615 | * if we don't include the sllao. So here we check | |
616 | * if our address is optimistic, and if so, we | |
bea85195 | 617 | * suppress the inclusion of the sllao. |
95c385b4 NH |
618 | */ |
619 | if (send_sllao) { | |
c346dca1 | 620 | struct inet6_ifaddr *ifp = ipv6_get_ifaddr(dev_net(dev), saddr, |
1cab3da6 | 621 | dev, 1); |
95c385b4 NH |
622 | if (ifp) { |
623 | if (ifp->flags & IFA_F_OPTIMISTIC) { | |
ca043569 | 624 | send_sllao = 0; |
95c385b4 | 625 | } |
ca043569 | 626 | in6_ifa_put(ifp); |
95c385b4 NH |
627 | } else { |
628 | send_sllao = 0; | |
629 | } | |
630 | } | |
631 | #endif | |
1cb3fe51 YH |
632 | if (send_sllao) |
633 | optlen += ndisc_opt_addr_space(dev); | |
634 | ||
635 | skb = ndisc_alloc_skb(dev, sizeof(*msg) + optlen); | |
b44b5f4a YH |
636 | if (!skb) |
637 | return; | |
638 | ||
1cb3fe51 YH |
639 | msg = (struct rs_msg *)skb_put(skb, sizeof(*msg)); |
640 | *msg = (struct rs_msg) { | |
641 | .icmph = { | |
642 | .icmp6_type = NDISC_ROUTER_SOLICITATION, | |
643 | }, | |
644 | }; | |
645 | ||
646 | if (send_sllao) | |
647 | ndisc_fill_addr_option(skb, ND_OPT_SOURCE_LL_ADDR, | |
648 | dev->dev_addr); | |
649 | ||
b44b5f4a | 650 | ndisc_send_skb(skb, daddr, saddr); |
1da177e4 | 651 | } |
1ab1457c | 652 | |
1da177e4 LT |
653 | |
654 | static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb) | |
655 | { | |
656 | /* | |
657 | * "The sender MUST return an ICMP | |
658 | * destination unreachable" | |
659 | */ | |
660 | dst_link_failure(skb); | |
661 | kfree_skb(skb); | |
662 | } | |
663 | ||
664 | /* Called with locked neigh: either read or both */ | |
665 | ||
666 | static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb) | |
667 | { | |
668 | struct in6_addr *saddr = NULL; | |
669 | struct in6_addr mcaddr; | |
670 | struct net_device *dev = neigh->dev; | |
671 | struct in6_addr *target = (struct in6_addr *)&neigh->primary_key; | |
672 | int probes = atomic_read(&neigh->probes); | |
673 | ||
c58da4c6 EK |
674 | if (skb && ipv6_chk_addr_and_flags(dev_net(dev), &ipv6_hdr(skb)->saddr, |
675 | dev, 1, | |
676 | IFA_F_TENTATIVE|IFA_F_OPTIMISTIC)) | |
0660e03f | 677 | saddr = &ipv6_hdr(skb)->saddr; |
e5d08d71 IM |
678 | probes -= NEIGH_VAR(neigh->parms, UCAST_PROBES); |
679 | if (probes < 0) { | |
1da177e4 | 680 | if (!(neigh->nud_state & NUD_VALID)) { |
675418d5 JP |
681 | ND_PRINTK(1, dbg, |
682 | "%s: trying to ucast probe in NUD_INVALID: %pI6\n", | |
683 | __func__, target); | |
1da177e4 | 684 | } |
38cf595b | 685 | ndisc_send_ns(dev, target, target, saddr, skb); |
1f9248e5 | 686 | } else if ((probes -= NEIGH_VAR(neigh->parms, APP_PROBES)) < 0) { |
1da177e4 | 687 | neigh_app_ns(neigh); |
1da177e4 LT |
688 | } else { |
689 | addrconf_addr_solict_mult(target, &mcaddr); | |
38cf595b | 690 | ndisc_send_ns(dev, target, &mcaddr, saddr, skb); |
1da177e4 LT |
691 | } |
692 | } | |
693 | ||
0736ffc0 YH |
694 | static int pndisc_is_router(const void *pkey, |
695 | struct net_device *dev) | |
fa86d322 PE |
696 | { |
697 | struct pneigh_entry *n; | |
0736ffc0 | 698 | int ret = -1; |
fa86d322 PE |
699 | |
700 | read_lock_bh(&nd_tbl.lock); | |
0736ffc0 YH |
701 | n = __pneigh_lookup(&nd_tbl, dev_net(dev), pkey, dev); |
702 | if (n) | |
703 | ret = !!(n->flags & NTF_ROUTER); | |
fa86d322 PE |
704 | read_unlock_bh(&nd_tbl.lock); |
705 | ||
0736ffc0 | 706 | return ret; |
fa86d322 PE |
707 | } |
708 | ||
1da177e4 LT |
709 | static void ndisc_recv_ns(struct sk_buff *skb) |
710 | { | |
9c70220b | 711 | struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb); |
b71d1d42 ED |
712 | const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; |
713 | const struct in6_addr *daddr = &ipv6_hdr(skb)->daddr; | |
1da177e4 | 714 | u8 *lladdr = NULL; |
29a3cad5 | 715 | u32 ndoptlen = skb_tail_pointer(skb) - (skb_transport_header(skb) + |
27a884dc | 716 | offsetof(struct nd_msg, opt)); |
1da177e4 LT |
717 | struct ndisc_options ndopts; |
718 | struct net_device *dev = skb->dev; | |
719 | struct inet6_ifaddr *ifp; | |
720 | struct inet6_dev *idev = NULL; | |
721 | struct neighbour *neigh; | |
722 | int dad = ipv6_addr_any(saddr); | |
a50feda5 | 723 | bool inc; |
0736ffc0 | 724 | int is_router = -1; |
1da177e4 | 725 | |
115b0aa6 YH |
726 | if (skb->len < sizeof(struct nd_msg)) { |
727 | ND_PRINTK(2, warn, "NS: packet too short\n"); | |
728 | return; | |
729 | } | |
730 | ||
1da177e4 | 731 | if (ipv6_addr_is_multicast(&msg->target)) { |
675418d5 | 732 | ND_PRINTK(2, warn, "NS: multicast target address\n"); |
1da177e4 LT |
733 | return; |
734 | } | |
735 | ||
736 | /* | |
737 | * RFC2461 7.1.1: | |
738 | * DAD has to be destined for solicited node multicast address. | |
739 | */ | |
ca97a644 | 740 | if (dad && !ipv6_addr_is_solict_mult(daddr)) { |
675418d5 | 741 | ND_PRINTK(2, warn, "NS: bad DAD packet (wrong destination)\n"); |
1da177e4 LT |
742 | return; |
743 | } | |
744 | ||
745 | if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) { | |
675418d5 | 746 | ND_PRINTK(2, warn, "NS: invalid ND options\n"); |
1da177e4 LT |
747 | return; |
748 | } | |
749 | ||
750 | if (ndopts.nd_opts_src_lladdr) { | |
751 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, dev); | |
752 | if (!lladdr) { | |
675418d5 JP |
753 | ND_PRINTK(2, warn, |
754 | "NS: invalid link-layer address length\n"); | |
1da177e4 LT |
755 | return; |
756 | } | |
757 | ||
758 | /* RFC2461 7.1.1: | |
1ab1457c YH |
759 | * If the IP source address is the unspecified address, |
760 | * there MUST NOT be source link-layer address option | |
1da177e4 LT |
761 | * in the message. |
762 | */ | |
763 | if (dad) { | |
675418d5 JP |
764 | ND_PRINTK(2, warn, |
765 | "NS: bad DAD packet (link-layer address option)\n"); | |
1da177e4 LT |
766 | return; |
767 | } | |
768 | } | |
769 | ||
770 | inc = ipv6_addr_is_multicast(daddr); | |
771 | ||
c346dca1 | 772 | ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1); |
a18bc695 | 773 | if (ifp) { |
ca254490 | 774 | have_ifp: |
95c385b4 NH |
775 | if (ifp->flags & (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC)) { |
776 | if (dad) { | |
95c385b4 NH |
777 | /* |
778 | * We are colliding with another node | |
779 | * who is doing DAD | |
780 | * so fail our DAD process | |
781 | */ | |
782 | addrconf_dad_failure(ifp); | |
9e3be4b3 | 783 | return; |
95c385b4 NH |
784 | } else { |
785 | /* | |
786 | * This is not a dad solicitation. | |
787 | * If we are an optimistic node, | |
788 | * we should respond. | |
789 | * Otherwise, we should ignore it. | |
790 | */ | |
791 | if (!(ifp->flags & IFA_F_OPTIMISTIC)) | |
1da177e4 | 792 | goto out; |
1da177e4 | 793 | } |
1da177e4 LT |
794 | } |
795 | ||
796 | idev = ifp->idev; | |
797 | } else { | |
53b7997f YH |
798 | struct net *net = dev_net(dev); |
799 | ||
ca254490 DA |
800 | /* perhaps an address on the master device */ |
801 | if (netif_is_l3_slave(dev)) { | |
802 | struct net_device *mdev; | |
803 | ||
804 | mdev = netdev_master_upper_dev_get_rcu(dev); | |
805 | if (mdev) { | |
806 | ifp = ipv6_get_ifaddr(net, &msg->target, mdev, 1); | |
807 | if (ifp) | |
808 | goto have_ifp; | |
809 | } | |
810 | } | |
811 | ||
1da177e4 LT |
812 | idev = in6_dev_get(dev); |
813 | if (!idev) { | |
814 | /* XXX: count this drop? */ | |
815 | return; | |
816 | } | |
817 | ||
53b7997f | 818 | if (ipv6_chk_acast_addr(net, dev, &msg->target) || |
1ab1457c | 819 | (idev->cnf.forwarding && |
53b7997f | 820 | (net->ipv6.devconf_all->proxy_ndp || idev->cnf.proxy_ndp) && |
0736ffc0 | 821 | (is_router = pndisc_is_router(&msg->target, dev)) >= 0)) { |
a61bbcf2 | 822 | if (!(NEIGH_CB(skb)->flags & LOCALLY_ENQUEUED) && |
1da177e4 | 823 | skb->pkt_type != PACKET_HOST && |
f2f79cca | 824 | inc && |
1f9248e5 | 825 | NEIGH_VAR(idev->nd_parms, PROXY_DELAY) != 0) { |
1da177e4 LT |
826 | /* |
827 | * for anycast or proxy, | |
1ab1457c YH |
828 | * sender should delay its response |
829 | * by a random time between 0 and | |
1da177e4 LT |
830 | * MAX_ANYCAST_DELAY_TIME seconds. |
831 | * (RFC2461) -- yoshfuji | |
832 | */ | |
833 | struct sk_buff *n = skb_clone(skb, GFP_ATOMIC); | |
834 | if (n) | |
835 | pneigh_enqueue(&nd_tbl, idev->nd_parms, n); | |
836 | goto out; | |
837 | } | |
838 | } else | |
839 | goto out; | |
840 | } | |
841 | ||
0736ffc0 | 842 | if (is_router < 0) |
fb568637 | 843 | is_router = idev->cnf.forwarding; |
62dd9318 | 844 | |
1da177e4 | 845 | if (dad) { |
38cf595b | 846 | ndisc_send_na(dev, &in6addr_linklocal_allnodes, &msg->target, |
fb568637 | 847 | !!is_router, false, (ifp != NULL), true); |
1da177e4 LT |
848 | goto out; |
849 | } | |
850 | ||
851 | if (inc) | |
852 | NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_mcast); | |
853 | else | |
854 | NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_ucast); | |
855 | ||
1ab1457c | 856 | /* |
1da177e4 LT |
857 | * update / create cache entry |
858 | * for the source address | |
859 | */ | |
860 | neigh = __neigh_lookup(&nd_tbl, saddr, dev, | |
861 | !inc || lladdr || !dev->addr_len); | |
862 | if (neigh) | |
1ab1457c | 863 | neigh_update(neigh, lladdr, NUD_STALE, |
1da177e4 LT |
864 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
865 | NEIGH_UPDATE_F_OVERRIDE); | |
3b04ddde | 866 | if (neigh || !dev->header_ops) { |
38cf595b | 867 | ndisc_send_na(dev, saddr, &msg->target, !!is_router, |
fb568637 | 868 | true, (ifp != NULL && inc), inc); |
1da177e4 LT |
869 | if (neigh) |
870 | neigh_release(neigh); | |
871 | } | |
872 | ||
873 | out: | |
874 | if (ifp) | |
875 | in6_ifa_put(ifp); | |
876 | else | |
877 | in6_dev_put(idev); | |
1da177e4 LT |
878 | } |
879 | ||
880 | static void ndisc_recv_na(struct sk_buff *skb) | |
881 | { | |
9c70220b | 882 | struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb); |
be7a010d | 883 | struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; |
b71d1d42 | 884 | const struct in6_addr *daddr = &ipv6_hdr(skb)->daddr; |
1da177e4 | 885 | u8 *lladdr = NULL; |
29a3cad5 | 886 | u32 ndoptlen = skb_tail_pointer(skb) - (skb_transport_header(skb) + |
27a884dc | 887 | offsetof(struct nd_msg, opt)); |
1da177e4 LT |
888 | struct ndisc_options ndopts; |
889 | struct net_device *dev = skb->dev; | |
890 | struct inet6_ifaddr *ifp; | |
891 | struct neighbour *neigh; | |
892 | ||
893 | if (skb->len < sizeof(struct nd_msg)) { | |
675418d5 | 894 | ND_PRINTK(2, warn, "NA: packet too short\n"); |
1da177e4 LT |
895 | return; |
896 | } | |
897 | ||
898 | if (ipv6_addr_is_multicast(&msg->target)) { | |
675418d5 | 899 | ND_PRINTK(2, warn, "NA: target address is multicast\n"); |
1da177e4 LT |
900 | return; |
901 | } | |
902 | ||
903 | if (ipv6_addr_is_multicast(daddr) && | |
904 | msg->icmph.icmp6_solicited) { | |
675418d5 | 905 | ND_PRINTK(2, warn, "NA: solicited NA is multicasted\n"); |
1da177e4 LT |
906 | return; |
907 | } | |
1ab1457c | 908 | |
1da177e4 | 909 | if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) { |
675418d5 | 910 | ND_PRINTK(2, warn, "NS: invalid ND option\n"); |
1da177e4 LT |
911 | return; |
912 | } | |
913 | if (ndopts.nd_opts_tgt_lladdr) { | |
914 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, dev); | |
915 | if (!lladdr) { | |
675418d5 JP |
916 | ND_PRINTK(2, warn, |
917 | "NA: invalid link-layer address length\n"); | |
1da177e4 LT |
918 | return; |
919 | } | |
920 | } | |
c346dca1 | 921 | ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1); |
a18bc695 | 922 | if (ifp) { |
bd015928 DW |
923 | if (skb->pkt_type != PACKET_LOOPBACK |
924 | && (ifp->flags & IFA_F_TENTATIVE)) { | |
925 | addrconf_dad_failure(ifp); | |
926 | return; | |
1da177e4 LT |
927 | } |
928 | /* What should we make now? The advertisement | |
929 | is invalid, but ndisc specs say nothing | |
930 | about it. It could be misconfiguration, or | |
931 | an smart proxy agent tries to help us :-) | |
24fc7b86 JS |
932 | |
933 | We should not print the error if NA has been | |
934 | received from loopback - it is just our own | |
935 | unsolicited advertisement. | |
1da177e4 | 936 | */ |
24fc7b86 | 937 | if (skb->pkt_type != PACKET_LOOPBACK) |
675418d5 JP |
938 | ND_PRINTK(1, warn, |
939 | "NA: someone advertises our address %pI6 on %s!\n", | |
940 | &ifp->addr, ifp->idev->dev->name); | |
1da177e4 LT |
941 | in6_ifa_put(ifp); |
942 | return; | |
943 | } | |
944 | neigh = neigh_lookup(&nd_tbl, &msg->target, dev); | |
945 | ||
946 | if (neigh) { | |
947 | u8 old_flags = neigh->flags; | |
53b7997f | 948 | struct net *net = dev_net(dev); |
1da177e4 LT |
949 | |
950 | if (neigh->nud_state & NUD_FAILED) | |
951 | goto out; | |
952 | ||
5f3e6e9e VN |
953 | /* |
954 | * Don't update the neighbor cache entry on a proxy NA from | |
955 | * ourselves because either the proxied node is off link or it | |
956 | * has already sent a NA to us. | |
957 | */ | |
958 | if (lladdr && !memcmp(lladdr, dev->dev_addr, dev->addr_len) && | |
53b7997f YH |
959 | net->ipv6.devconf_all->forwarding && net->ipv6.devconf_all->proxy_ndp && |
960 | pneigh_lookup(&nd_tbl, net, &msg->target, dev, 0)) { | |
b20b6d97 | 961 | /* XXX: idev->cnf.proxy_ndp */ |
5f3e6e9e | 962 | goto out; |
fbea49e1 | 963 | } |
5f3e6e9e | 964 | |
1da177e4 LT |
965 | neigh_update(neigh, lladdr, |
966 | msg->icmph.icmp6_solicited ? NUD_REACHABLE : NUD_STALE, | |
967 | NEIGH_UPDATE_F_WEAK_OVERRIDE| | |
968 | (msg->icmph.icmp6_override ? NEIGH_UPDATE_F_OVERRIDE : 0)| | |
969 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
970 | (msg->icmph.icmp6_router ? NEIGH_UPDATE_F_ISROUTER : 0)); | |
971 | ||
972 | if ((old_flags & ~neigh->flags) & NTF_ROUTER) { | |
973 | /* | |
974 | * Change: router to host | |
975 | */ | |
be7a010d | 976 | rt6_clean_tohost(dev_net(dev), saddr); |
1da177e4 LT |
977 | } |
978 | ||
979 | out: | |
980 | neigh_release(neigh); | |
981 | } | |
982 | } | |
983 | ||
984 | static void ndisc_recv_rs(struct sk_buff *skb) | |
985 | { | |
9c70220b | 986 | struct rs_msg *rs_msg = (struct rs_msg *)skb_transport_header(skb); |
1da177e4 LT |
987 | unsigned long ndoptlen = skb->len - sizeof(*rs_msg); |
988 | struct neighbour *neigh; | |
989 | struct inet6_dev *idev; | |
b71d1d42 | 990 | const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; |
1da177e4 LT |
991 | struct ndisc_options ndopts; |
992 | u8 *lladdr = NULL; | |
993 | ||
994 | if (skb->len < sizeof(*rs_msg)) | |
995 | return; | |
996 | ||
cfdf7647 | 997 | idev = __in6_dev_get(skb->dev); |
1da177e4 | 998 | if (!idev) { |
675418d5 | 999 | ND_PRINTK(1, err, "RS: can't find in6 device\n"); |
1da177e4 LT |
1000 | return; |
1001 | } | |
1002 | ||
1003 | /* Don't accept RS if we're not in router mode */ | |
1004 | if (!idev->cnf.forwarding) | |
1005 | goto out; | |
1006 | ||
1007 | /* | |
1008 | * Don't update NCE if src = ::; | |
1009 | * this implies that the source node has no ip address assigned yet. | |
1010 | */ | |
1011 | if (ipv6_addr_any(saddr)) | |
1012 | goto out; | |
1013 | ||
1014 | /* Parse ND options */ | |
1015 | if (!ndisc_parse_options(rs_msg->opt, ndoptlen, &ndopts)) { | |
675418d5 | 1016 | ND_PRINTK(2, notice, "NS: invalid ND option, ignored\n"); |
1da177e4 LT |
1017 | goto out; |
1018 | } | |
1019 | ||
1020 | if (ndopts.nd_opts_src_lladdr) { | |
1021 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, | |
1022 | skb->dev); | |
1023 | if (!lladdr) | |
1024 | goto out; | |
1025 | } | |
1026 | ||
1027 | neigh = __neigh_lookup(&nd_tbl, saddr, skb->dev, 1); | |
1028 | if (neigh) { | |
1029 | neigh_update(neigh, lladdr, NUD_STALE, | |
1030 | NEIGH_UPDATE_F_WEAK_OVERRIDE| | |
1031 | NEIGH_UPDATE_F_OVERRIDE| | |
1032 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER); | |
1033 | neigh_release(neigh); | |
1034 | } | |
1035 | out: | |
cfdf7647 | 1036 | return; |
1da177e4 LT |
1037 | } |
1038 | ||
31910575 PY |
1039 | static void ndisc_ra_useropt(struct sk_buff *ra, struct nd_opt_hdr *opt) |
1040 | { | |
1041 | struct icmp6hdr *icmp6h = (struct icmp6hdr *)skb_transport_header(ra); | |
1042 | struct sk_buff *skb; | |
1043 | struct nlmsghdr *nlh; | |
1044 | struct nduseroptmsg *ndmsg; | |
c346dca1 | 1045 | struct net *net = dev_net(ra->dev); |
31910575 PY |
1046 | int err; |
1047 | int base_size = NLMSG_ALIGN(sizeof(struct nduseroptmsg) | |
1048 | + (opt->nd_opt_len << 3)); | |
1049 | size_t msg_size = base_size + nla_total_size(sizeof(struct in6_addr)); | |
1050 | ||
1051 | skb = nlmsg_new(msg_size, GFP_ATOMIC); | |
63159f29 | 1052 | if (!skb) { |
31910575 PY |
1053 | err = -ENOBUFS; |
1054 | goto errout; | |
1055 | } | |
1056 | ||
1057 | nlh = nlmsg_put(skb, 0, 0, RTM_NEWNDUSEROPT, base_size, 0); | |
63159f29 | 1058 | if (!nlh) { |
31910575 PY |
1059 | goto nla_put_failure; |
1060 | } | |
1061 | ||
1062 | ndmsg = nlmsg_data(nlh); | |
1063 | ndmsg->nduseropt_family = AF_INET6; | |
dbb2ed24 | 1064 | ndmsg->nduseropt_ifindex = ra->dev->ifindex; |
31910575 PY |
1065 | ndmsg->nduseropt_icmp_type = icmp6h->icmp6_type; |
1066 | ndmsg->nduseropt_icmp_code = icmp6h->icmp6_code; | |
1067 | ndmsg->nduseropt_opts_len = opt->nd_opt_len << 3; | |
1068 | ||
1069 | memcpy(ndmsg + 1, opt, opt->nd_opt_len << 3); | |
1070 | ||
930345ea | 1071 | if (nla_put_in6_addr(skb, NDUSEROPT_SRCADDR, &ipv6_hdr(ra)->saddr)) |
c78679e8 | 1072 | goto nla_put_failure; |
31910575 PY |
1073 | nlmsg_end(skb, nlh); |
1074 | ||
1ce85fe4 | 1075 | rtnl_notify(skb, net, 0, RTNLGRP_ND_USEROPT, NULL, GFP_ATOMIC); |
31910575 PY |
1076 | return; |
1077 | ||
1078 | nla_put_failure: | |
1079 | nlmsg_free(skb); | |
1080 | err = -EMSGSIZE; | |
1081 | errout: | |
a18bc695 | 1082 | rtnl_set_sk_err(net, RTNLGRP_ND_USEROPT, err); |
31910575 PY |
1083 | } |
1084 | ||
1da177e4 LT |
1085 | static void ndisc_router_discovery(struct sk_buff *skb) |
1086 | { | |
9c70220b | 1087 | struct ra_msg *ra_msg = (struct ra_msg *)skb_transport_header(skb); |
1da177e4 LT |
1088 | struct neighbour *neigh = NULL; |
1089 | struct inet6_dev *in6_dev; | |
65f5c7c1 | 1090 | struct rt6_info *rt = NULL; |
1da177e4 LT |
1091 | int lifetime; |
1092 | struct ndisc_options ndopts; | |
1093 | int optlen; | |
ebacaaa0 | 1094 | unsigned int pref = 0; |
a394eef5 | 1095 | __u32 old_if_flags; |
2053aeb6 | 1096 | bool send_ifinfo_notify = false; |
1da177e4 | 1097 | |
67ba4152 | 1098 | __u8 *opt = (__u8 *)(ra_msg + 1); |
1da177e4 | 1099 | |
29a3cad5 SH |
1100 | optlen = (skb_tail_pointer(skb) - skb_transport_header(skb)) - |
1101 | sizeof(struct ra_msg); | |
1da177e4 | 1102 | |
f2a762d8 BG |
1103 | ND_PRINTK(2, info, |
1104 | "RA: %s, dev: %s\n", | |
1105 | __func__, skb->dev->name); | |
0660e03f | 1106 | if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) { |
675418d5 | 1107 | ND_PRINTK(2, warn, "RA: source address is not link-local\n"); |
1da177e4 LT |
1108 | return; |
1109 | } | |
1110 | if (optlen < 0) { | |
675418d5 | 1111 | ND_PRINTK(2, warn, "RA: packet too short\n"); |
1da177e4 LT |
1112 | return; |
1113 | } | |
1114 | ||
de357cc0 | 1115 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 | 1116 | if (skb->ndisc_nodetype == NDISC_NODETYPE_HOST) { |
675418d5 | 1117 | ND_PRINTK(2, warn, "RA: from host or unauthorized router\n"); |
fadf6bf0 TF |
1118 | return; |
1119 | } | |
de357cc0 | 1120 | #endif |
fadf6bf0 | 1121 | |
1da177e4 LT |
1122 | /* |
1123 | * set the RA_RECV flag in the interface | |
1124 | */ | |
1125 | ||
cfdf7647 | 1126 | in6_dev = __in6_dev_get(skb->dev); |
63159f29 | 1127 | if (!in6_dev) { |
675418d5 JP |
1128 | ND_PRINTK(0, err, "RA: can't find inet6 device for %s\n", |
1129 | skb->dev->name); | |
1da177e4 LT |
1130 | return; |
1131 | } | |
1da177e4 LT |
1132 | |
1133 | if (!ndisc_parse_options(opt, optlen, &ndopts)) { | |
675418d5 | 1134 | ND_PRINTK(2, warn, "RA: invalid ND options\n"); |
1da177e4 LT |
1135 | return; |
1136 | } | |
1137 | ||
f2a762d8 BG |
1138 | if (!ipv6_accept_ra(in6_dev)) { |
1139 | ND_PRINTK(2, info, | |
1140 | "RA: %s, did not accept ra for dev: %s\n", | |
1141 | __func__, skb->dev->name); | |
31ce8c71 | 1142 | goto skip_linkparms; |
f2a762d8 | 1143 | } |
31ce8c71 | 1144 | |
de357cc0 | 1145 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 | 1146 | /* skip link-specific parameters from interior routers */ |
f2a762d8 BG |
1147 | if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT) { |
1148 | ND_PRINTK(2, info, | |
1149 | "RA: %s, nodetype is NODEFAULT, dev: %s\n", | |
1150 | __func__, skb->dev->name); | |
fadf6bf0 | 1151 | goto skip_linkparms; |
f2a762d8 | 1152 | } |
de357cc0 | 1153 | #endif |
fadf6bf0 | 1154 | |
1da177e4 LT |
1155 | if (in6_dev->if_flags & IF_RS_SENT) { |
1156 | /* | |
1157 | * flag that an RA was received after an RS was sent | |
1158 | * out on this interface. | |
1159 | */ | |
1160 | in6_dev->if_flags |= IF_RA_RCVD; | |
1161 | } | |
1162 | ||
1163 | /* | |
1164 | * Remember the managed/otherconf flags from most recently | |
1165 | * received RA message (RFC 2462) -- yoshfuji | |
1166 | */ | |
a394eef5 | 1167 | old_if_flags = in6_dev->if_flags; |
1da177e4 LT |
1168 | in6_dev->if_flags = (in6_dev->if_flags & ~(IF_RA_MANAGED | |
1169 | IF_RA_OTHERCONF)) | | |
1170 | (ra_msg->icmph.icmp6_addrconf_managed ? | |
1171 | IF_RA_MANAGED : 0) | | |
1172 | (ra_msg->icmph.icmp6_addrconf_other ? | |
1173 | IF_RA_OTHERCONF : 0); | |
1174 | ||
a394eef5 | 1175 | if (old_if_flags != in6_dev->if_flags) |
2053aeb6 | 1176 | send_ifinfo_notify = true; |
a394eef5 | 1177 | |
f2a762d8 BG |
1178 | if (!in6_dev->cnf.accept_ra_defrtr) { |
1179 | ND_PRINTK(2, info, | |
1180 | "RA: %s, defrtr is false for dev: %s\n", | |
1181 | __func__, skb->dev->name); | |
65f5c7c1 | 1182 | goto skip_defrtr; |
f2a762d8 | 1183 | } |
65f5c7c1 | 1184 | |
d9333196 BG |
1185 | /* Do not accept RA with source-addr found on local machine unless |
1186 | * accept_ra_from_local is set to true. | |
1187 | */ | |
b6428817 LR |
1188 | if (!in6_dev->cnf.accept_ra_from_local && |
1189 | ipv6_chk_addr(dev_net(in6_dev->dev), &ipv6_hdr(skb)->saddr, | |
1190 | NULL, 0)) { | |
f2a762d8 | 1191 | ND_PRINTK(2, info, |
d9333196 BG |
1192 | "RA from local address detected on dev: %s: default router ignored\n", |
1193 | skb->dev->name); | |
9f56220f | 1194 | goto skip_defrtr; |
f2a762d8 | 1195 | } |
9f56220f | 1196 | |
1da177e4 LT |
1197 | lifetime = ntohs(ra_msg->icmph.icmp6_rt_lifetime); |
1198 | ||
ebacaaa0 YH |
1199 | #ifdef CONFIG_IPV6_ROUTER_PREF |
1200 | pref = ra_msg->icmph.icmp6_router_pref; | |
1201 | /* 10b is handled as if it were 00b (medium) */ | |
930d6ff2 | 1202 | if (pref == ICMPV6_ROUTER_PREF_INVALID || |
6d5b78cd | 1203 | !in6_dev->cnf.accept_ra_rtr_pref) |
ebacaaa0 YH |
1204 | pref = ICMPV6_ROUTER_PREF_MEDIUM; |
1205 | #endif | |
1206 | ||
0660e03f | 1207 | rt = rt6_get_dflt_router(&ipv6_hdr(skb)->saddr, skb->dev); |
1da177e4 | 1208 | |
eb857186 DM |
1209 | if (rt) { |
1210 | neigh = dst_neigh_lookup(&rt->dst, &ipv6_hdr(skb)->saddr); | |
1211 | if (!neigh) { | |
675418d5 JP |
1212 | ND_PRINTK(0, err, |
1213 | "RA: %s got default router without neighbour\n", | |
1214 | __func__); | |
94e187c0 | 1215 | ip6_rt_put(rt); |
eb857186 DM |
1216 | return; |
1217 | } | |
1218 | } | |
1da177e4 | 1219 | if (rt && lifetime == 0) { |
e0a1ad73 | 1220 | ip6_del_rt(rt); |
1da177e4 LT |
1221 | rt = NULL; |
1222 | } | |
1223 | ||
f2a762d8 BG |
1224 | ND_PRINTK(3, info, "RA: rt: %p lifetime: %d, for dev: %s\n", |
1225 | rt, lifetime, skb->dev->name); | |
63159f29 | 1226 | if (!rt && lifetime) { |
f2a762d8 | 1227 | ND_PRINTK(3, info, "RA: adding default router\n"); |
1da177e4 | 1228 | |
0660e03f | 1229 | rt = rt6_add_dflt_router(&ipv6_hdr(skb)->saddr, skb->dev, pref); |
63159f29 | 1230 | if (!rt) { |
675418d5 JP |
1231 | ND_PRINTK(0, err, |
1232 | "RA: %s failed to add default route\n", | |
1233 | __func__); | |
1da177e4 LT |
1234 | return; |
1235 | } | |
1236 | ||
eb857186 | 1237 | neigh = dst_neigh_lookup(&rt->dst, &ipv6_hdr(skb)->saddr); |
63159f29 | 1238 | if (!neigh) { |
675418d5 JP |
1239 | ND_PRINTK(0, err, |
1240 | "RA: %s got default router without neighbour\n", | |
1241 | __func__); | |
94e187c0 | 1242 | ip6_rt_put(rt); |
1da177e4 LT |
1243 | return; |
1244 | } | |
1245 | neigh->flags |= NTF_ROUTER; | |
ebacaaa0 | 1246 | } else if (rt) { |
22441cfa | 1247 | rt->rt6i_flags = (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); |
1da177e4 LT |
1248 | } |
1249 | ||
1250 | if (rt) | |
1716a961 | 1251 | rt6_set_expires(rt, jiffies + (HZ * lifetime)); |
8013d1d7 HL |
1252 | if (in6_dev->cnf.accept_ra_min_hop_limit < 256 && |
1253 | ra_msg->icmph.icmp6_hop_limit) { | |
1254 | if (in6_dev->cnf.accept_ra_min_hop_limit <= ra_msg->icmph.icmp6_hop_limit) { | |
6fd99094 | 1255 | in6_dev->cnf.hop_limit = ra_msg->icmph.icmp6_hop_limit; |
8013d1d7 HL |
1256 | if (rt) |
1257 | dst_metric_set(&rt->dst, RTAX_HOPLIMIT, | |
1258 | ra_msg->icmph.icmp6_hop_limit); | |
6fd99094 | 1259 | } else { |
8013d1d7 | 1260 | ND_PRINTK(2, warn, "RA: Got route advertisement with lower hop_limit than minimum\n"); |
6fd99094 | 1261 | } |
1da177e4 LT |
1262 | } |
1263 | ||
65f5c7c1 YH |
1264 | skip_defrtr: |
1265 | ||
1da177e4 LT |
1266 | /* |
1267 | * Update Reachable Time and Retrans Timer | |
1268 | */ | |
1269 | ||
1270 | if (in6_dev->nd_parms) { | |
1271 | unsigned long rtime = ntohl(ra_msg->retrans_timer); | |
1272 | ||
1273 | if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/HZ) { | |
1274 | rtime = (rtime*HZ)/1000; | |
1275 | if (rtime < HZ/10) | |
1276 | rtime = HZ/10; | |
1f9248e5 | 1277 | NEIGH_VAR_SET(in6_dev->nd_parms, RETRANS_TIME, rtime); |
1da177e4 | 1278 | in6_dev->tstamp = jiffies; |
2053aeb6 | 1279 | send_ifinfo_notify = true; |
1da177e4 LT |
1280 | } |
1281 | ||
1282 | rtime = ntohl(ra_msg->reachable_time); | |
1283 | if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/(3*HZ)) { | |
1284 | rtime = (rtime*HZ)/1000; | |
1285 | ||
1286 | if (rtime < HZ/10) | |
1287 | rtime = HZ/10; | |
1288 | ||
1f9248e5 JP |
1289 | if (rtime != NEIGH_VAR(in6_dev->nd_parms, BASE_REACHABLE_TIME)) { |
1290 | NEIGH_VAR_SET(in6_dev->nd_parms, | |
1291 | BASE_REACHABLE_TIME, rtime); | |
1292 | NEIGH_VAR_SET(in6_dev->nd_parms, | |
1293 | GC_STALETIME, 3 * rtime); | |
1da177e4 LT |
1294 | in6_dev->nd_parms->reachable_time = neigh_rand_reach_time(rtime); |
1295 | in6_dev->tstamp = jiffies; | |
2053aeb6 | 1296 | send_ifinfo_notify = true; |
1da177e4 LT |
1297 | } |
1298 | } | |
1299 | } | |
1300 | ||
2053aeb6 MT |
1301 | /* |
1302 | * Send a notify if RA changed managed/otherconf flags or timer settings | |
1303 | */ | |
1304 | if (send_ifinfo_notify) | |
1305 | inet6_ifinfo_notify(RTM_NEWLINK, in6_dev); | |
1306 | ||
fadf6bf0 TF |
1307 | skip_linkparms: |
1308 | ||
1da177e4 LT |
1309 | /* |
1310 | * Process options. | |
1311 | */ | |
1312 | ||
1313 | if (!neigh) | |
0660e03f | 1314 | neigh = __neigh_lookup(&nd_tbl, &ipv6_hdr(skb)->saddr, |
1da177e4 LT |
1315 | skb->dev, 1); |
1316 | if (neigh) { | |
1317 | u8 *lladdr = NULL; | |
1318 | if (ndopts.nd_opts_src_lladdr) { | |
1319 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, | |
1320 | skb->dev); | |
1321 | if (!lladdr) { | |
675418d5 JP |
1322 | ND_PRINTK(2, warn, |
1323 | "RA: invalid link-layer address length\n"); | |
1da177e4 LT |
1324 | goto out; |
1325 | } | |
1326 | } | |
1327 | neigh_update(neigh, lladdr, NUD_STALE, | |
1328 | NEIGH_UPDATE_F_WEAK_OVERRIDE| | |
1329 | NEIGH_UPDATE_F_OVERRIDE| | |
1330 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
1331 | NEIGH_UPDATE_F_ISROUTER); | |
1332 | } | |
1333 | ||
f2a762d8 BG |
1334 | if (!ipv6_accept_ra(in6_dev)) { |
1335 | ND_PRINTK(2, info, | |
1336 | "RA: %s, accept_ra is false for dev: %s\n", | |
1337 | __func__, skb->dev->name); | |
31ce8c71 | 1338 | goto out; |
f2a762d8 | 1339 | } |
31ce8c71 | 1340 | |
70ceb4f5 | 1341 | #ifdef CONFIG_IPV6_ROUTE_INFO |
b6428817 LR |
1342 | if (!in6_dev->cnf.accept_ra_from_local && |
1343 | ipv6_chk_addr(dev_net(in6_dev->dev), &ipv6_hdr(skb)->saddr, | |
1344 | NULL, 0)) { | |
f2a762d8 | 1345 | ND_PRINTK(2, info, |
d9333196 BG |
1346 | "RA from local address detected on dev: %s: router info ignored.\n", |
1347 | skb->dev->name); | |
9f56220f | 1348 | goto skip_routeinfo; |
f2a762d8 | 1349 | } |
9f56220f | 1350 | |
09c884d4 | 1351 | if (in6_dev->cnf.accept_ra_rtr_pref && ndopts.nd_opts_ri) { |
70ceb4f5 YH |
1352 | struct nd_opt_hdr *p; |
1353 | for (p = ndopts.nd_opts_ri; | |
1354 | p; | |
1355 | p = ndisc_next_option(p, ndopts.nd_opts_ri_end)) { | |
6294e000 YH |
1356 | struct route_info *ri = (struct route_info *)p; |
1357 | #ifdef CONFIG_IPV6_NDISC_NODETYPE | |
1358 | if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT && | |
1359 | ri->prefix_len == 0) | |
1360 | continue; | |
1361 | #endif | |
30e56918 DJ |
1362 | if (ri->prefix_len == 0 && |
1363 | !in6_dev->cnf.accept_ra_defrtr) | |
1364 | continue; | |
6294e000 | 1365 | if (ri->prefix_len > in6_dev->cnf.accept_ra_rt_info_max_plen) |
09c884d4 | 1366 | continue; |
67ba4152 | 1367 | rt6_route_rcv(skb->dev, (u8 *)p, (p->nd_opt_len) << 3, |
0660e03f | 1368 | &ipv6_hdr(skb)->saddr); |
70ceb4f5 YH |
1369 | } |
1370 | } | |
9f56220f AH |
1371 | |
1372 | skip_routeinfo: | |
70ceb4f5 YH |
1373 | #endif |
1374 | ||
de357cc0 | 1375 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 | 1376 | /* skip link-specific ndopts from interior routers */ |
f2a762d8 BG |
1377 | if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT) { |
1378 | ND_PRINTK(2, info, | |
1379 | "RA: %s, nodetype is NODEFAULT (interior routes), dev: %s\n", | |
1380 | __func__, skb->dev->name); | |
fadf6bf0 | 1381 | goto out; |
f2a762d8 | 1382 | } |
de357cc0 | 1383 | #endif |
fadf6bf0 | 1384 | |
c4fd30eb | 1385 | if (in6_dev->cnf.accept_ra_pinfo && ndopts.nd_opts_pi) { |
1da177e4 LT |
1386 | struct nd_opt_hdr *p; |
1387 | for (p = ndopts.nd_opts_pi; | |
1388 | p; | |
1389 | p = ndisc_next_option(p, ndopts.nd_opts_pi_end)) { | |
e6bff995 NH |
1390 | addrconf_prefix_rcv(skb->dev, (u8 *)p, |
1391 | (p->nd_opt_len) << 3, | |
1392 | ndopts.nd_opts_src_lladdr != NULL); | |
1da177e4 LT |
1393 | } |
1394 | } | |
1395 | ||
c2943f14 | 1396 | if (ndopts.nd_opts_mtu && in6_dev->cnf.accept_ra_mtu) { |
e69a4adc | 1397 | __be32 n; |
1da177e4 LT |
1398 | u32 mtu; |
1399 | ||
67ba4152 | 1400 | memcpy(&n, ((u8 *)(ndopts.nd_opts_mtu+1))+2, sizeof(mtu)); |
e69a4adc | 1401 | mtu = ntohl(n); |
1da177e4 LT |
1402 | |
1403 | if (mtu < IPV6_MIN_MTU || mtu > skb->dev->mtu) { | |
675418d5 | 1404 | ND_PRINTK(2, warn, "RA: invalid mtu: %d\n", mtu); |
1da177e4 LT |
1405 | } else if (in6_dev->cnf.mtu6 != mtu) { |
1406 | in6_dev->cnf.mtu6 = mtu; | |
1407 | ||
1408 | if (rt) | |
defb3519 | 1409 | dst_metric_set(&rt->dst, RTAX_MTU, mtu); |
1da177e4 LT |
1410 | |
1411 | rt6_mtu_change(skb->dev, mtu); | |
1412 | } | |
1413 | } | |
1ab1457c | 1414 | |
31910575 | 1415 | if (ndopts.nd_useropts) { |
61cf46ad YH |
1416 | struct nd_opt_hdr *p; |
1417 | for (p = ndopts.nd_useropts; | |
1418 | p; | |
1419 | p = ndisc_next_useropt(p, ndopts.nd_useropts_end)) { | |
1420 | ndisc_ra_useropt(skb, p); | |
31910575 PY |
1421 | } |
1422 | } | |
1423 | ||
1da177e4 | 1424 | if (ndopts.nd_opts_tgt_lladdr || ndopts.nd_opts_rh) { |
675418d5 | 1425 | ND_PRINTK(2, warn, "RA: invalid RA options\n"); |
1da177e4 LT |
1426 | } |
1427 | out: | |
94e187c0 | 1428 | ip6_rt_put(rt); |
eb857186 | 1429 | if (neigh) |
1da177e4 | 1430 | neigh_release(neigh); |
1da177e4 LT |
1431 | } |
1432 | ||
1433 | static void ndisc_redirect_rcv(struct sk_buff *skb) | |
1434 | { | |
093d04d4 DJ |
1435 | u8 *hdr; |
1436 | struct ndisc_options ndopts; | |
1437 | struct rd_msg *msg = (struct rd_msg *)skb_transport_header(skb); | |
29a3cad5 | 1438 | u32 ndoptlen = skb_tail_pointer(skb) - (skb_transport_header(skb) + |
093d04d4 DJ |
1439 | offsetof(struct rd_msg, opt)); |
1440 | ||
de357cc0 | 1441 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 TF |
1442 | switch (skb->ndisc_nodetype) { |
1443 | case NDISC_NODETYPE_HOST: | |
1444 | case NDISC_NODETYPE_NODEFAULT: | |
675418d5 JP |
1445 | ND_PRINTK(2, warn, |
1446 | "Redirect: from host or unauthorized router\n"); | |
fadf6bf0 TF |
1447 | return; |
1448 | } | |
de357cc0 | 1449 | #endif |
fadf6bf0 | 1450 | |
0660e03f | 1451 | if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) { |
675418d5 JP |
1452 | ND_PRINTK(2, warn, |
1453 | "Redirect: source address is not link-local\n"); | |
1da177e4 LT |
1454 | return; |
1455 | } | |
1456 | ||
093d04d4 DJ |
1457 | if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) |
1458 | return; | |
1459 | ||
c92a59ec | 1460 | if (!ndopts.nd_opts_rh) { |
b55b76b2 DJ |
1461 | ip6_redirect_no_header(skb, dev_net(skb->dev), |
1462 | skb->dev->ifindex, 0); | |
093d04d4 | 1463 | return; |
c92a59ec | 1464 | } |
093d04d4 DJ |
1465 | |
1466 | hdr = (u8 *)ndopts.nd_opts_rh; | |
1467 | hdr += 8; | |
1468 | if (!pskb_pull(skb, hdr - skb_transport_header(skb))) | |
1469 | return; | |
1470 | ||
b94f1c09 | 1471 | icmpv6_notify(skb, NDISC_REDIRECT, 0, 0); |
1da177e4 LT |
1472 | } |
1473 | ||
5f5a0115 YH |
1474 | static void ndisc_fill_redirect_hdr_option(struct sk_buff *skb, |
1475 | struct sk_buff *orig_skb, | |
1476 | int rd_len) | |
9c86dafe | 1477 | { |
5f5a0115 YH |
1478 | u8 *opt = skb_put(skb, rd_len); |
1479 | ||
9c86dafe YH |
1480 | memset(opt, 0, 8); |
1481 | *(opt++) = ND_OPT_REDIRECT_HDR; | |
1482 | *(opt++) = (rd_len >> 3); | |
1483 | opt += 6; | |
1484 | ||
1485 | memcpy(opt, ipv6_hdr(orig_skb), rd_len - 8); | |
9c86dafe YH |
1486 | } |
1487 | ||
4991969a | 1488 | void ndisc_send_redirect(struct sk_buff *skb, const struct in6_addr *target) |
1da177e4 | 1489 | { |
1762f7e8 | 1490 | struct net_device *dev = skb->dev; |
c346dca1 | 1491 | struct net *net = dev_net(dev); |
1762f7e8 | 1492 | struct sock *sk = net->ipv6.ndisc_sk; |
2ce13576 | 1493 | int optlen = 0; |
fbfe95a4 | 1494 | struct inet_peer *peer; |
1da177e4 | 1495 | struct sk_buff *buff; |
71bcdba0 | 1496 | struct rd_msg *msg; |
1da177e4 | 1497 | struct in6_addr saddr_buf; |
1da177e4 LT |
1498 | struct rt6_info *rt; |
1499 | struct dst_entry *dst; | |
4c9483b2 | 1500 | struct flowi6 fl6; |
1da177e4 | 1501 | int rd_len; |
1da177e4 | 1502 | u8 ha_buf[MAX_ADDR_LEN], *ha = NULL; |
ca254490 | 1503 | int oif = l3mdev_fib_oif(dev); |
1d861aa4 | 1504 | bool ret; |
1da177e4 | 1505 | |
95c385b4 | 1506 | if (ipv6_get_lladdr(dev, &saddr_buf, IFA_F_TENTATIVE)) { |
675418d5 JP |
1507 | ND_PRINTK(2, warn, "Redirect: no link-local address on %s\n", |
1508 | dev->name); | |
1ab1457c YH |
1509 | return; |
1510 | } | |
1da177e4 | 1511 | |
0660e03f | 1512 | if (!ipv6_addr_equal(&ipv6_hdr(skb)->daddr, target) && |
bf0b48df | 1513 | ipv6_addr_type(target) != (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) { |
675418d5 JP |
1514 | ND_PRINTK(2, warn, |
1515 | "Redirect: target address is not link-local unicast\n"); | |
29556526 LY |
1516 | return; |
1517 | } | |
1518 | ||
4c9483b2 | 1519 | icmpv6_flow_init(sk, &fl6, NDISC_REDIRECT, |
ca254490 DA |
1520 | &saddr_buf, &ipv6_hdr(skb)->saddr, oif); |
1521 | ||
1522 | if (oif != skb->dev->ifindex) | |
1523 | fl6.flowi6_flags |= FLOWI_FLAG_L3MDEV_SRC; | |
1da177e4 | 1524 | |
4c9483b2 | 1525 | dst = ip6_route_output(net, NULL, &fl6); |
5095d64d RL |
1526 | if (dst->error) { |
1527 | dst_release(dst); | |
1da177e4 | 1528 | return; |
5095d64d | 1529 | } |
4c9483b2 | 1530 | dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), NULL, 0); |
452edd59 | 1531 | if (IS_ERR(dst)) |
1da177e4 | 1532 | return; |
1da177e4 LT |
1533 | |
1534 | rt = (struct rt6_info *) dst; | |
1535 | ||
1536 | if (rt->rt6i_flags & RTF_GATEWAY) { | |
675418d5 JP |
1537 | ND_PRINTK(2, warn, |
1538 | "Redirect: destination is not a neighbour\n"); | |
d73f0801 | 1539 | goto release; |
1da177e4 | 1540 | } |
fd0273d7 | 1541 | peer = inet_getpeer_v6(net->ipv6.peers, &ipv6_hdr(skb)->saddr, 1); |
1d861aa4 DM |
1542 | ret = inet_peer_xrlim_allow(peer, 1*HZ); |
1543 | if (peer) | |
1544 | inet_putpeer(peer); | |
1545 | if (!ret) | |
d73f0801 | 1546 | goto release; |
1da177e4 LT |
1547 | |
1548 | if (dev->addr_len) { | |
4991969a DM |
1549 | struct neighbour *neigh = dst_neigh_lookup(skb_dst(skb), target); |
1550 | if (!neigh) { | |
675418d5 JP |
1551 | ND_PRINTK(2, warn, |
1552 | "Redirect: no neigh for target address\n"); | |
4991969a DM |
1553 | goto release; |
1554 | } | |
1555 | ||
1da177e4 LT |
1556 | read_lock_bh(&neigh->lock); |
1557 | if (neigh->nud_state & NUD_VALID) { | |
1558 | memcpy(ha_buf, neigh->ha, dev->addr_len); | |
1559 | read_unlock_bh(&neigh->lock); | |
1560 | ha = ha_buf; | |
2ce13576 | 1561 | optlen += ndisc_opt_addr_space(dev); |
1da177e4 LT |
1562 | } else |
1563 | read_unlock_bh(&neigh->lock); | |
4991969a DM |
1564 | |
1565 | neigh_release(neigh); | |
1da177e4 LT |
1566 | } |
1567 | ||
1568 | rd_len = min_t(unsigned int, | |
2ce13576 YH |
1569 | IPV6_MIN_MTU - sizeof(struct ipv6hdr) - sizeof(*msg) - optlen, |
1570 | skb->len + 8); | |
1da177e4 | 1571 | rd_len &= ~0x7; |
2ce13576 | 1572 | optlen += rd_len; |
1da177e4 | 1573 | |
2ce13576 | 1574 | buff = ndisc_alloc_skb(dev, sizeof(*msg) + optlen); |
de09334b | 1575 | if (!buff) |
d73f0801 | 1576 | goto release; |
1da177e4 | 1577 | |
4d5c152e YH |
1578 | msg = (struct rd_msg *)skb_put(buff, sizeof(*msg)); |
1579 | *msg = (struct rd_msg) { | |
1580 | .icmph = { | |
1581 | .icmp6_type = NDISC_REDIRECT, | |
1582 | }, | |
1583 | .target = *target, | |
1584 | .dest = ipv6_hdr(skb)->daddr, | |
1585 | }; | |
1da177e4 | 1586 | |
1da177e4 LT |
1587 | /* |
1588 | * include target_address option | |
1589 | */ | |
1590 | ||
1591 | if (ha) | |
33be081a | 1592 | ndisc_fill_addr_option(buff, ND_OPT_TARGET_LL_ADDR, ha); |
1da177e4 LT |
1593 | |
1594 | /* | |
1595 | * build redirect option and copy skb over to the new packet. | |
1596 | */ | |
1597 | ||
9c86dafe | 1598 | if (rd_len) |
5f5a0115 | 1599 | ndisc_fill_redirect_hdr_option(buff, skb, rd_len); |
1da177e4 | 1600 | |
adf30907 | 1601 | skb_dst_set(buff, dst); |
f4de84c6 | 1602 | ndisc_send_skb(buff, &ipv6_hdr(skb)->saddr, &saddr_buf); |
d73f0801 IJ |
1603 | return; |
1604 | ||
1605 | release: | |
1606 | dst_release(dst); | |
1da177e4 LT |
1607 | } |
1608 | ||
1609 | static void pndisc_redo(struct sk_buff *skb) | |
1610 | { | |
140e26fc | 1611 | ndisc_recv_ns(skb); |
1da177e4 LT |
1612 | kfree_skb(skb); |
1613 | } | |
1614 | ||
b800c3b9 HFS |
1615 | static bool ndisc_suppress_frag_ndisc(struct sk_buff *skb) |
1616 | { | |
1617 | struct inet6_dev *idev = __in6_dev_get(skb->dev); | |
1618 | ||
1619 | if (!idev) | |
1620 | return true; | |
1621 | if (IP6CB(skb)->flags & IP6SKB_FRAGMENTED && | |
1622 | idev->cnf.suppress_frag_ndisc) { | |
1623 | net_warn_ratelimited("Received fragmented ndisc packet. Carefully consider disabling suppress_frag_ndisc.\n"); | |
1624 | return true; | |
1625 | } | |
1626 | return false; | |
1627 | } | |
1628 | ||
1da177e4 LT |
1629 | int ndisc_rcv(struct sk_buff *skb) |
1630 | { | |
1631 | struct nd_msg *msg; | |
1632 | ||
b800c3b9 HFS |
1633 | if (ndisc_suppress_frag_ndisc(skb)) |
1634 | return 0; | |
1635 | ||
6bce6b4e | 1636 | if (skb_linearize(skb)) |
1da177e4 LT |
1637 | return 0; |
1638 | ||
9c70220b | 1639 | msg = (struct nd_msg *)skb_transport_header(skb); |
1da177e4 | 1640 | |
9c70220b | 1641 | __skb_push(skb, skb->data - skb_transport_header(skb)); |
1da177e4 | 1642 | |
0660e03f | 1643 | if (ipv6_hdr(skb)->hop_limit != 255) { |
675418d5 JP |
1644 | ND_PRINTK(2, warn, "NDISC: invalid hop-limit: %d\n", |
1645 | ipv6_hdr(skb)->hop_limit); | |
1da177e4 LT |
1646 | return 0; |
1647 | } | |
1648 | ||
1649 | if (msg->icmph.icmp6_code != 0) { | |
675418d5 JP |
1650 | ND_PRINTK(2, warn, "NDISC: invalid ICMPv6 code: %d\n", |
1651 | msg->icmph.icmp6_code); | |
1da177e4 LT |
1652 | return 0; |
1653 | } | |
1654 | ||
a61bbcf2 PM |
1655 | memset(NEIGH_CB(skb), 0, sizeof(struct neighbour_cb)); |
1656 | ||
1da177e4 LT |
1657 | switch (msg->icmph.icmp6_type) { |
1658 | case NDISC_NEIGHBOUR_SOLICITATION: | |
1659 | ndisc_recv_ns(skb); | |
1660 | break; | |
1661 | ||
1662 | case NDISC_NEIGHBOUR_ADVERTISEMENT: | |
1663 | ndisc_recv_na(skb); | |
1664 | break; | |
1665 | ||
1666 | case NDISC_ROUTER_SOLICITATION: | |
1667 | ndisc_recv_rs(skb); | |
1668 | break; | |
1669 | ||
1670 | case NDISC_ROUTER_ADVERTISEMENT: | |
1671 | ndisc_router_discovery(skb); | |
1672 | break; | |
1673 | ||
1674 | case NDISC_REDIRECT: | |
1675 | ndisc_redirect_rcv(skb); | |
1676 | break; | |
3ff50b79 | 1677 | } |
1da177e4 LT |
1678 | |
1679 | return 0; | |
1680 | } | |
1681 | ||
1682 | static int ndisc_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1683 | { | |
351638e7 | 1684 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
c8507fb2 | 1685 | struct netdev_notifier_change_info *change_info; |
c346dca1 | 1686 | struct net *net = dev_net(dev); |
5cb04436 | 1687 | struct inet6_dev *idev; |
1da177e4 LT |
1688 | |
1689 | switch (event) { | |
1690 | case NETDEV_CHANGEADDR: | |
1691 | neigh_changeaddr(&nd_tbl, dev); | |
2ac3ac8f | 1692 | fib6_run_gc(0, net, false); |
5cb04436 HFS |
1693 | idev = in6_dev_get(dev); |
1694 | if (!idev) | |
1695 | break; | |
1696 | if (idev->cnf.ndisc_notify) | |
1697 | ndisc_send_unsol_na(dev); | |
1698 | in6_dev_put(idev); | |
1da177e4 | 1699 | break; |
c8507fb2 ED |
1700 | case NETDEV_CHANGE: |
1701 | change_info = ptr; | |
1702 | if (change_info->flags_changed & IFF_NOARP) | |
1703 | neigh_changeaddr(&nd_tbl, dev); | |
1704 | break; | |
1da177e4 LT |
1705 | case NETDEV_DOWN: |
1706 | neigh_ifdown(&nd_tbl, dev); | |
2ac3ac8f | 1707 | fib6_run_gc(0, net, false); |
1da177e4 | 1708 | break; |
f47b9464 BH |
1709 | case NETDEV_NOTIFY_PEERS: |
1710 | ndisc_send_unsol_na(dev); | |
1711 | break; | |
1da177e4 LT |
1712 | default: |
1713 | break; | |
1714 | } | |
1715 | ||
1716 | return NOTIFY_DONE; | |
1717 | } | |
1718 | ||
1719 | static struct notifier_block ndisc_netdev_notifier = { | |
1720 | .notifier_call = ndisc_netdev_event, | |
1721 | }; | |
1722 | ||
1723 | #ifdef CONFIG_SYSCTL | |
1724 | static void ndisc_warn_deprecated_sysctl(struct ctl_table *ctl, | |
1725 | const char *func, const char *dev_name) | |
1726 | { | |
1727 | static char warncomm[TASK_COMM_LEN]; | |
1728 | static int warned; | |
1729 | if (strcmp(warncomm, current->comm) && warned < 5) { | |
1730 | strcpy(warncomm, current->comm); | |
f3213831 | 1731 | 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 |
1732 | warncomm, func, |
1733 | dev_name, ctl->procname, | |
1734 | dev_name, ctl->procname); | |
1735 | warned++; | |
1736 | } | |
1737 | } | |
1738 | ||
8d65af78 | 1739 | int ndisc_ifinfo_sysctl_change(struct ctl_table *ctl, int write, void __user *buffer, size_t *lenp, loff_t *ppos) |
1da177e4 LT |
1740 | { |
1741 | struct net_device *dev = ctl->extra1; | |
1742 | struct inet6_dev *idev; | |
1743 | int ret; | |
1744 | ||
d12af679 EB |
1745 | if ((strcmp(ctl->procname, "retrans_time") == 0) || |
1746 | (strcmp(ctl->procname, "base_reachable_time") == 0)) | |
1da177e4 LT |
1747 | ndisc_warn_deprecated_sysctl(ctl, "syscall", dev ? dev->name : "default"); |
1748 | ||
d12af679 | 1749 | if (strcmp(ctl->procname, "retrans_time") == 0) |
cb5b09c1 | 1750 | ret = neigh_proc_dointvec(ctl, write, buffer, lenp, ppos); |
d12af679 EB |
1751 | |
1752 | else if (strcmp(ctl->procname, "base_reachable_time") == 0) | |
cb5b09c1 JP |
1753 | ret = neigh_proc_dointvec_jiffies(ctl, write, |
1754 | buffer, lenp, ppos); | |
d12af679 EB |
1755 | |
1756 | else if ((strcmp(ctl->procname, "retrans_time_ms") == 0) || | |
ad02ac14 | 1757 | (strcmp(ctl->procname, "base_reachable_time_ms") == 0)) |
cb5b09c1 JP |
1758 | ret = neigh_proc_dointvec_ms_jiffies(ctl, write, |
1759 | buffer, lenp, ppos); | |
d12af679 | 1760 | else |
1da177e4 | 1761 | ret = -1; |
1da177e4 LT |
1762 | |
1763 | if (write && ret == 0 && dev && (idev = in6_dev_get(dev)) != NULL) { | |
1f9248e5 JP |
1764 | if (ctl->data == &NEIGH_VAR(idev->nd_parms, BASE_REACHABLE_TIME)) |
1765 | idev->nd_parms->reachable_time = | |
1766 | neigh_rand_reach_time(NEIGH_VAR(idev->nd_parms, BASE_REACHABLE_TIME)); | |
1da177e4 LT |
1767 | idev->tstamp = jiffies; |
1768 | inet6_ifinfo_notify(RTM_NEWLINK, idev); | |
1769 | in6_dev_put(idev); | |
1770 | } | |
1771 | return ret; | |
1772 | } | |
1773 | ||
1da177e4 LT |
1774 | |
1775 | #endif | |
1776 | ||
2c8c1e72 | 1777 | static int __net_init ndisc_net_init(struct net *net) |
1da177e4 LT |
1778 | { |
1779 | struct ipv6_pinfo *np; | |
1780 | struct sock *sk; | |
1ab1457c | 1781 | int err; |
1da177e4 | 1782 | |
1ed8516f DL |
1783 | err = inet_ctl_sock_create(&sk, PF_INET6, |
1784 | SOCK_RAW, IPPROTO_ICMPV6, net); | |
1da177e4 | 1785 | if (err < 0) { |
675418d5 JP |
1786 | ND_PRINTK(0, err, |
1787 | "NDISC: Failed to initialize the control socket (err %d)\n", | |
1788 | err); | |
1da177e4 LT |
1789 | return err; |
1790 | } | |
1791 | ||
1ed8516f | 1792 | net->ipv6.ndisc_sk = sk; |
1762f7e8 | 1793 | |
1da177e4 | 1794 | np = inet6_sk(sk); |
1da177e4 LT |
1795 | np->hop_limit = 255; |
1796 | /* Do not loopback ndisc messages */ | |
1797 | np->mc_loop = 0; | |
1da177e4 | 1798 | |
1762f7e8 DL |
1799 | return 0; |
1800 | } | |
1801 | ||
2c8c1e72 | 1802 | static void __net_exit ndisc_net_exit(struct net *net) |
1762f7e8 | 1803 | { |
1ed8516f | 1804 | inet_ctl_sock_destroy(net->ipv6.ndisc_sk); |
1762f7e8 DL |
1805 | } |
1806 | ||
1807 | static struct pernet_operations ndisc_net_ops = { | |
1808 | .init = ndisc_net_init, | |
1809 | .exit = ndisc_net_exit, | |
1810 | }; | |
1811 | ||
1812 | int __init ndisc_init(void) | |
1813 | { | |
1814 | int err; | |
1815 | ||
1816 | err = register_pernet_subsys(&ndisc_net_ops); | |
1817 | if (err) | |
1818 | return err; | |
1ab1457c YH |
1819 | /* |
1820 | * Initialize the neighbour table | |
1821 | */ | |
d7480fd3 | 1822 | neigh_table_init(NEIGH_ND_TABLE, &nd_tbl); |
1da177e4 LT |
1823 | |
1824 | #ifdef CONFIG_SYSCTL | |
73af614a | 1825 | err = neigh_sysctl_register(NULL, &nd_tbl.parms, |
56ec0fb1 | 1826 | ndisc_ifinfo_sysctl_change); |
1762f7e8 DL |
1827 | if (err) |
1828 | goto out_unregister_pernet; | |
1762f7e8 | 1829 | out: |
bcd081a3 | 1830 | #endif |
1762f7e8 | 1831 | return err; |
1da177e4 | 1832 | |
1762f7e8 | 1833 | #ifdef CONFIG_SYSCTL |
1762f7e8 | 1834 | out_unregister_pernet: |
1762f7e8 DL |
1835 | unregister_pernet_subsys(&ndisc_net_ops); |
1836 | goto out; | |
2c861cc6 | 1837 | #endif |
1da177e4 LT |
1838 | } |
1839 | ||
2c861cc6 MK |
1840 | int __init ndisc_late_init(void) |
1841 | { | |
1842 | return register_netdevice_notifier(&ndisc_netdev_notifier); | |
1843 | } | |
1844 | ||
1845 | void ndisc_late_cleanup(void) | |
1da177e4 | 1846 | { |
36f73d0c | 1847 | unregister_netdevice_notifier(&ndisc_netdev_notifier); |
2c861cc6 MK |
1848 | } |
1849 | ||
1850 | void ndisc_cleanup(void) | |
1851 | { | |
1da177e4 LT |
1852 | #ifdef CONFIG_SYSCTL |
1853 | neigh_sysctl_unregister(&nd_tbl.parms); | |
1854 | #endif | |
d7480fd3 | 1855 | neigh_table_clear(NEIGH_ND_TABLE, &nd_tbl); |
1762f7e8 | 1856 | unregister_pernet_subsys(&ndisc_net_ops); |
1da177e4 | 1857 | } |