]>
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> |
da13c59b | 49 | #include <linux/if_ether.h> |
1da177e4 LT |
50 | #include <linux/if_arp.h> |
51 | #include <linux/ipv6.h> | |
52 | #include <linux/icmpv6.h> | |
53 | #include <linux/jhash.h> | |
54 | ||
55 | #include <net/sock.h> | |
56 | #include <net/snmp.h> | |
57 | ||
58 | #include <net/ipv6.h> | |
59 | #include <net/protocol.h> | |
60 | #include <net/ndisc.h> | |
61 | #include <net/ip6_route.h> | |
62 | #include <net/addrconf.h> | |
63 | #include <net/icmp.h> | |
64 | ||
31910575 PY |
65 | #include <net/netlink.h> |
66 | #include <linux/rtnetlink.h> | |
67 | ||
1da177e4 LT |
68 | #include <net/flow.h> |
69 | #include <net/ip6_checksum.h> | |
1ed8516f | 70 | #include <net/inet_common.h> |
1da177e4 LT |
71 | #include <linux/proc_fs.h> |
72 | ||
73 | #include <linux/netfilter.h> | |
74 | #include <linux/netfilter_ipv6.h> | |
75 | ||
d6bf7817 ED |
76 | static u32 ndisc_hash(const void *pkey, |
77 | const struct net_device *dev, | |
2c2aba6c | 78 | __u32 *hash_rnd); |
60395a20 | 79 | static bool ndisc_key_eq(const struct neighbour *neigh, const void *pkey); |
1da177e4 LT |
80 | static int ndisc_constructor(struct neighbour *neigh); |
81 | static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb); | |
82 | static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb); | |
83 | static int pndisc_constructor(struct pneigh_entry *n); | |
84 | static void pndisc_destructor(struct pneigh_entry *n); | |
85 | static void pndisc_redo(struct sk_buff *skb); | |
86 | ||
89d69d2b | 87 | static const struct neigh_ops ndisc_generic_ops = { |
1da177e4 LT |
88 | .family = AF_INET6, |
89 | .solicit = ndisc_solicit, | |
90 | .error_report = ndisc_error_report, | |
91 | .output = neigh_resolve_output, | |
92 | .connected_output = neigh_connected_output, | |
1da177e4 LT |
93 | }; |
94 | ||
89d69d2b | 95 | static const struct neigh_ops ndisc_hh_ops = { |
1da177e4 LT |
96 | .family = AF_INET6, |
97 | .solicit = ndisc_solicit, | |
98 | .error_report = ndisc_error_report, | |
99 | .output = neigh_resolve_output, | |
100 | .connected_output = neigh_resolve_output, | |
1da177e4 LT |
101 | }; |
102 | ||
103 | ||
89d69d2b | 104 | static const struct neigh_ops ndisc_direct_ops = { |
1da177e4 | 105 | .family = AF_INET6, |
8f40b161 DM |
106 | .output = neigh_direct_output, |
107 | .connected_output = neigh_direct_output, | |
1da177e4 LT |
108 | }; |
109 | ||
110 | struct neigh_table nd_tbl = { | |
111 | .family = AF_INET6, | |
1da177e4 | 112 | .key_len = sizeof(struct in6_addr), |
bdf53c58 | 113 | .protocol = cpu_to_be16(ETH_P_IPV6), |
1da177e4 | 114 | .hash = ndisc_hash, |
60395a20 | 115 | .key_eq = ndisc_key_eq, |
1da177e4 LT |
116 | .constructor = ndisc_constructor, |
117 | .pconstructor = pndisc_constructor, | |
118 | .pdestructor = pndisc_destructor, | |
119 | .proxy_redo = pndisc_redo, | |
120 | .id = "ndisc_cache", | |
121 | .parms = { | |
b672083e | 122 | .tbl = &nd_tbl, |
b672083e | 123 | .reachable_time = ND_REACHABLE_TIME, |
1f9248e5 JP |
124 | .data = { |
125 | [NEIGH_VAR_MCAST_PROBES] = 3, | |
126 | [NEIGH_VAR_UCAST_PROBES] = 3, | |
127 | [NEIGH_VAR_RETRANS_TIME] = ND_RETRANS_TIMER, | |
128 | [NEIGH_VAR_BASE_REACHABLE_TIME] = ND_REACHABLE_TIME, | |
129 | [NEIGH_VAR_DELAY_PROBE_TIME] = 5 * HZ, | |
130 | [NEIGH_VAR_GC_STALETIME] = 60 * HZ, | |
eaa72dc4 | 131 | [NEIGH_VAR_QUEUE_LEN_BYTES] = SK_WMEM_MAX, |
1f9248e5 JP |
132 | [NEIGH_VAR_PROXY_QLEN] = 64, |
133 | [NEIGH_VAR_ANYCAST_DELAY] = 1 * HZ, | |
134 | [NEIGH_VAR_PROXY_DELAY] = (8 * HZ) / 10, | |
135 | }, | |
1da177e4 LT |
136 | }, |
137 | .gc_interval = 30 * HZ, | |
138 | .gc_thresh1 = 128, | |
139 | .gc_thresh2 = 512, | |
140 | .gc_thresh3 = 1024, | |
141 | }; | |
c4850687 | 142 | EXPORT_SYMBOL_GPL(nd_tbl); |
1da177e4 | 143 | |
cc84b3c6 AA |
144 | void __ndisc_fill_addr_option(struct sk_buff *skb, int type, void *data, |
145 | int data_len, int pad) | |
1da177e4 | 146 | { |
8ec5da41 | 147 | int space = __ndisc_opt_addr_space(data_len, pad); |
5f5a0115 | 148 | u8 *opt = skb_put(skb, space); |
1da177e4 LT |
149 | |
150 | opt[0] = type; | |
151 | opt[1] = space>>3; | |
152 | ||
153 | memset(opt + 2, 0, pad); | |
154 | opt += pad; | |
155 | space -= pad; | |
156 | ||
157 | memcpy(opt+2, data, data_len); | |
158 | data_len += 2; | |
159 | opt += data_len; | |
e5d08d71 IM |
160 | space -= data_len; |
161 | if (space > 0) | |
1da177e4 | 162 | memset(opt, 0, space); |
1da177e4 | 163 | } |
cc84b3c6 | 164 | EXPORT_SYMBOL_GPL(__ndisc_fill_addr_option); |
1da177e4 | 165 | |
8ec5da41 | 166 | static inline void ndisc_fill_addr_option(struct sk_buff *skb, int type, |
f997c55c | 167 | void *data, u8 icmp6_type) |
8ec5da41 AA |
168 | { |
169 | __ndisc_fill_addr_option(skb, type, data, skb->dev->addr_len, | |
170 | ndisc_addr_option_pad(skb->dev->type)); | |
f997c55c AA |
171 | ndisc_ops_fill_addr_option(skb->dev, skb, icmp6_type); |
172 | } | |
173 | ||
174 | static inline void ndisc_fill_redirect_addr_option(struct sk_buff *skb, | |
175 | void *ha, | |
176 | const u8 *ops_data) | |
177 | { | |
178 | ndisc_fill_addr_option(skb, ND_OPT_TARGET_LL_ADDR, ha, NDISC_REDIRECT); | |
179 | ndisc_ops_fill_redirect_addr_option(skb->dev, skb, ops_data); | |
8ec5da41 AA |
180 | } |
181 | ||
1da177e4 LT |
182 | static struct nd_opt_hdr *ndisc_next_option(struct nd_opt_hdr *cur, |
183 | struct nd_opt_hdr *end) | |
184 | { | |
185 | int type; | |
186 | if (!cur || !end || cur >= end) | |
187 | return NULL; | |
188 | type = cur->nd_opt_type; | |
189 | do { | |
190 | cur = ((void *)cur) + (cur->nd_opt_len << 3); | |
67ba4152 | 191 | } while (cur < end && cur->nd_opt_type != type); |
a02cec21 | 192 | return cur <= end && cur->nd_opt_type == type ? cur : NULL; |
1da177e4 LT |
193 | } |
194 | ||
f997c55c AA |
195 | static inline int ndisc_is_useropt(const struct net_device *dev, |
196 | struct nd_opt_hdr *opt) | |
31910575 | 197 | { |
e35f30c1 | 198 | return opt->nd_opt_type == ND_OPT_RDNSS || |
f997c55c AA |
199 | opt->nd_opt_type == ND_OPT_DNSSL || |
200 | ndisc_ops_is_useropt(dev, opt->nd_opt_type); | |
31910575 PY |
201 | } |
202 | ||
f997c55c AA |
203 | static struct nd_opt_hdr *ndisc_next_useropt(const struct net_device *dev, |
204 | struct nd_opt_hdr *cur, | |
31910575 PY |
205 | struct nd_opt_hdr *end) |
206 | { | |
207 | if (!cur || !end || cur >= end) | |
208 | return NULL; | |
209 | do { | |
210 | cur = ((void *)cur) + (cur->nd_opt_len << 3); | |
f997c55c AA |
211 | } while (cur < end && !ndisc_is_useropt(dev, cur)); |
212 | return cur <= end && ndisc_is_useropt(dev, cur) ? cur : NULL; | |
31910575 PY |
213 | } |
214 | ||
f997c55c AA |
215 | struct ndisc_options *ndisc_parse_options(const struct net_device *dev, |
216 | u8 *opt, int opt_len, | |
30f2a5f3 | 217 | struct ndisc_options *ndopts) |
1da177e4 LT |
218 | { |
219 | struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)opt; | |
220 | ||
221 | if (!nd_opt || opt_len < 0 || !ndopts) | |
222 | return NULL; | |
223 | memset(ndopts, 0, sizeof(*ndopts)); | |
224 | while (opt_len) { | |
225 | int l; | |
226 | if (opt_len < sizeof(struct nd_opt_hdr)) | |
227 | return NULL; | |
228 | l = nd_opt->nd_opt_len << 3; | |
229 | if (opt_len < l || l == 0) | |
230 | return NULL; | |
f997c55c AA |
231 | if (ndisc_ops_parse_options(dev, nd_opt, ndopts)) |
232 | goto next_opt; | |
1da177e4 LT |
233 | switch (nd_opt->nd_opt_type) { |
234 | case ND_OPT_SOURCE_LL_ADDR: | |
235 | case ND_OPT_TARGET_LL_ADDR: | |
236 | case ND_OPT_MTU: | |
adc176c5 | 237 | case ND_OPT_NONCE: |
1da177e4 LT |
238 | case ND_OPT_REDIRECT_HDR: |
239 | if (ndopts->nd_opt_array[nd_opt->nd_opt_type]) { | |
675418d5 JP |
240 | ND_PRINTK(2, warn, |
241 | "%s: duplicated ND6 option found: type=%d\n", | |
242 | __func__, nd_opt->nd_opt_type); | |
1da177e4 LT |
243 | } else { |
244 | ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt; | |
245 | } | |
246 | break; | |
247 | case ND_OPT_PREFIX_INFO: | |
248 | ndopts->nd_opts_pi_end = nd_opt; | |
cfcabdcc | 249 | if (!ndopts->nd_opt_array[nd_opt->nd_opt_type]) |
1da177e4 LT |
250 | ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt; |
251 | break; | |
70ceb4f5 YH |
252 | #ifdef CONFIG_IPV6_ROUTE_INFO |
253 | case ND_OPT_ROUTE_INFO: | |
254 | ndopts->nd_opts_ri_end = nd_opt; | |
255 | if (!ndopts->nd_opts_ri) | |
256 | ndopts->nd_opts_ri = nd_opt; | |
257 | break; | |
258 | #endif | |
1da177e4 | 259 | default: |
f997c55c | 260 | if (ndisc_is_useropt(dev, nd_opt)) { |
31910575 PY |
261 | ndopts->nd_useropts_end = nd_opt; |
262 | if (!ndopts->nd_useropts) | |
263 | ndopts->nd_useropts = nd_opt; | |
264 | } else { | |
265 | /* | |
266 | * Unknown options must be silently ignored, | |
267 | * to accommodate future extension to the | |
268 | * protocol. | |
269 | */ | |
675418d5 JP |
270 | ND_PRINTK(2, notice, |
271 | "%s: ignored unsupported option; type=%d, len=%d\n", | |
272 | __func__, | |
273 | nd_opt->nd_opt_type, | |
274 | nd_opt->nd_opt_len); | |
31910575 | 275 | } |
1da177e4 | 276 | } |
f997c55c | 277 | next_opt: |
1da177e4 LT |
278 | opt_len -= l; |
279 | nd_opt = ((void *)nd_opt) + l; | |
280 | } | |
281 | return ndopts; | |
282 | } | |
283 | ||
b71d1d42 | 284 | int ndisc_mc_map(const struct in6_addr *addr, char *buf, struct net_device *dev, int dir) |
1da177e4 LT |
285 | { |
286 | switch (dev->type) { | |
287 | case ARPHRD_ETHER: | |
288 | case ARPHRD_IEEE802: /* Not sure. Check it later. --ANK */ | |
289 | case ARPHRD_FDDI: | |
290 | ipv6_eth_mc_map(addr, buf); | |
291 | return 0; | |
1da177e4 LT |
292 | case ARPHRD_ARCNET: |
293 | ipv6_arcnet_mc_map(addr, buf); | |
294 | return 0; | |
295 | case ARPHRD_INFINIBAND: | |
a9e527e3 | 296 | ipv6_ib_mc_map(addr, dev->broadcast, buf); |
1da177e4 | 297 | return 0; |
93ca3bb5 TT |
298 | case ARPHRD_IPGRE: |
299 | return ipv6_ipgre_mc_map(addr, dev->broadcast, buf); | |
1da177e4 LT |
300 | default: |
301 | if (dir) { | |
302 | memcpy(buf, dev->broadcast, dev->addr_len); | |
303 | return 0; | |
304 | } | |
305 | } | |
306 | return -EINVAL; | |
307 | } | |
7159039a YH |
308 | EXPORT_SYMBOL(ndisc_mc_map); |
309 | ||
d6bf7817 ED |
310 | static u32 ndisc_hash(const void *pkey, |
311 | const struct net_device *dev, | |
2c2aba6c | 312 | __u32 *hash_rnd) |
1da177e4 | 313 | { |
2c2aba6c | 314 | return ndisc_hashfn(pkey, dev, hash_rnd); |
1da177e4 LT |
315 | } |
316 | ||
60395a20 EB |
317 | static bool ndisc_key_eq(const struct neighbour *n, const void *pkey) |
318 | { | |
319 | return neigh_key_eq128(n, pkey); | |
320 | } | |
321 | ||
1da177e4 LT |
322 | static int ndisc_constructor(struct neighbour *neigh) |
323 | { | |
67ba4152 | 324 | struct in6_addr *addr = (struct in6_addr *)&neigh->primary_key; |
1da177e4 LT |
325 | struct net_device *dev = neigh->dev; |
326 | struct inet6_dev *in6_dev; | |
327 | struct neigh_parms *parms; | |
a50feda5 | 328 | bool is_multicast = ipv6_addr_is_multicast(addr); |
1da177e4 | 329 | |
1da177e4 | 330 | in6_dev = in6_dev_get(dev); |
63159f29 | 331 | if (!in6_dev) { |
1da177e4 LT |
332 | return -EINVAL; |
333 | } | |
334 | ||
335 | parms = in6_dev->nd_parms; | |
336 | __neigh_parms_put(neigh->parms); | |
337 | neigh->parms = neigh_parms_clone(parms); | |
1da177e4 LT |
338 | |
339 | neigh->type = is_multicast ? RTN_MULTICAST : RTN_UNICAST; | |
3b04ddde | 340 | if (!dev->header_ops) { |
1da177e4 LT |
341 | neigh->nud_state = NUD_NOARP; |
342 | neigh->ops = &ndisc_direct_ops; | |
8f40b161 | 343 | neigh->output = neigh_direct_output; |
1da177e4 LT |
344 | } else { |
345 | if (is_multicast) { | |
346 | neigh->nud_state = NUD_NOARP; | |
347 | ndisc_mc_map(addr, neigh->ha, dev, 1); | |
348 | } else if (dev->flags&(IFF_NOARP|IFF_LOOPBACK)) { | |
349 | neigh->nud_state = NUD_NOARP; | |
350 | memcpy(neigh->ha, dev->dev_addr, dev->addr_len); | |
351 | if (dev->flags&IFF_LOOPBACK) | |
352 | neigh->type = RTN_LOCAL; | |
353 | } else if (dev->flags&IFF_POINTOPOINT) { | |
354 | neigh->nud_state = NUD_NOARP; | |
355 | memcpy(neigh->ha, dev->broadcast, dev->addr_len); | |
356 | } | |
3b04ddde | 357 | if (dev->header_ops->cache) |
1da177e4 LT |
358 | neigh->ops = &ndisc_hh_ops; |
359 | else | |
360 | neigh->ops = &ndisc_generic_ops; | |
361 | if (neigh->nud_state&NUD_VALID) | |
362 | neigh->output = neigh->ops->connected_output; | |
363 | else | |
364 | neigh->output = neigh->ops->output; | |
365 | } | |
366 | in6_dev_put(in6_dev); | |
367 | return 0; | |
368 | } | |
369 | ||
370 | static int pndisc_constructor(struct pneigh_entry *n) | |
371 | { | |
67ba4152 | 372 | struct in6_addr *addr = (struct in6_addr *)&n->key; |
1da177e4 LT |
373 | struct in6_addr maddr; |
374 | struct net_device *dev = n->dev; | |
375 | ||
63159f29 | 376 | if (!dev || !__in6_dev_get(dev)) |
1da177e4 LT |
377 | return -EINVAL; |
378 | addrconf_addr_solict_mult(addr, &maddr); | |
379 | ipv6_dev_mc_inc(dev, &maddr); | |
380 | return 0; | |
381 | } | |
382 | ||
383 | static void pndisc_destructor(struct pneigh_entry *n) | |
384 | { | |
67ba4152 | 385 | struct in6_addr *addr = (struct in6_addr *)&n->key; |
1da177e4 LT |
386 | struct in6_addr maddr; |
387 | struct net_device *dev = n->dev; | |
388 | ||
63159f29 | 389 | if (!dev || !__in6_dev_get(dev)) |
1da177e4 LT |
390 | return; |
391 | addrconf_addr_solict_mult(addr, &maddr); | |
392 | ipv6_dev_mc_dec(dev, &maddr); | |
393 | } | |
394 | ||
de09334b YH |
395 | static struct sk_buff *ndisc_alloc_skb(struct net_device *dev, |
396 | int len) | |
397 | { | |
398 | int hlen = LL_RESERVED_SPACE(dev); | |
399 | int tlen = dev->needed_tailroom; | |
400 | struct sock *sk = dev_net(dev)->ipv6.ndisc_sk; | |
401 | struct sk_buff *skb; | |
de09334b | 402 | |
25a6e6b8 | 403 | skb = alloc_skb(hlen + sizeof(struct ipv6hdr) + len + tlen, GFP_ATOMIC); |
de09334b | 404 | if (!skb) { |
25a6e6b8 TG |
405 | ND_PRINTK(0, err, "ndisc: %s failed to allocate an skb\n", |
406 | __func__); | |
de09334b YH |
407 | return NULL; |
408 | } | |
409 | ||
f382d03a YH |
410 | skb->protocol = htons(ETH_P_IPV6); |
411 | skb->dev = dev; | |
412 | ||
527a150f | 413 | skb_reserve(skb, hlen + sizeof(struct ipv6hdr)); |
5135e633 | 414 | skb_reset_transport_header(skb); |
de09334b | 415 | |
25a6e6b8 TG |
416 | /* Manually assign socket ownership as we avoid calling |
417 | * sock_alloc_send_pskb() to bypass wmem buffer limits | |
418 | */ | |
419 | skb_set_owner_w(skb, sk); | |
420 | ||
de09334b YH |
421 | return skb; |
422 | } | |
423 | ||
f382d03a | 424 | static void ip6_nd_hdr(struct sk_buff *skb, |
2576f17d YH |
425 | const struct in6_addr *saddr, |
426 | const struct in6_addr *daddr, | |
c8d6c380 | 427 | int hop_limit, int len) |
2576f17d YH |
428 | { |
429 | struct ipv6hdr *hdr; | |
2210d6b2 MŻ |
430 | struct inet6_dev *idev; |
431 | unsigned tclass; | |
432 | ||
433 | rcu_read_lock(); | |
434 | idev = __in6_dev_get(skb->dev); | |
435 | tclass = idev ? idev->cnf.ndisc_tclass : 0; | |
436 | rcu_read_unlock(); | |
2576f17d | 437 | |
527a150f | 438 | skb_push(skb, sizeof(*hdr)); |
2576f17d | 439 | skb_reset_network_header(skb); |
2576f17d YH |
440 | hdr = ipv6_hdr(skb); |
441 | ||
2210d6b2 | 442 | ip6_flow_hdr(hdr, tclass, 0); |
2576f17d YH |
443 | |
444 | hdr->payload_len = htons(len); | |
c8d6c380 YH |
445 | hdr->nexthdr = IPPROTO_ICMPV6; |
446 | hdr->hop_limit = hop_limit; | |
2576f17d YH |
447 | |
448 | hdr->saddr = *saddr; | |
449 | hdr->daddr = *daddr; | |
450 | } | |
451 | ||
af9a9976 | 452 | static void ndisc_send_skb(struct sk_buff *skb, |
fd0ea7db | 453 | const struct in6_addr *daddr, |
aa4bdd4b | 454 | const struct in6_addr *saddr) |
305d552a | 455 | { |
f4de84c6 | 456 | struct dst_entry *dst = skb_dst(skb); |
af9a9976 | 457 | struct net *net = dev_net(skb->dev); |
7b3d9b06 | 458 | struct sock *sk = net->ipv6.ndisc_sk; |
305d552a BH |
459 | struct inet6_dev *idev; |
460 | int err; | |
aa4bdd4b | 461 | struct icmp6hdr *icmp6h = icmp6_hdr(skb); |
305d552a BH |
462 | u8 type; |
463 | ||
464 | type = icmp6h->icmp6_type; | |
465 | ||
f4de84c6 | 466 | if (!dst) { |
f4de84c6 | 467 | struct flowi6 fl6; |
e0d56fdd | 468 | int oif = skb->dev->ifindex; |
305d552a | 469 | |
ca254490 | 470 | icmpv6_flow_init(sk, &fl6, type, saddr, daddr, oif); |
f4de84c6 YH |
471 | dst = icmp6_dst_alloc(skb->dev, &fl6); |
472 | if (IS_ERR(dst)) { | |
473 | kfree_skb(skb); | |
474 | return; | |
475 | } | |
476 | ||
477 | skb_dst_set(skb, dst); | |
478 | } | |
e1ec7842 | 479 | |
7b3d9b06 YH |
480 | icmp6h->icmp6_cksum = csum_ipv6_magic(saddr, daddr, skb->len, |
481 | IPPROTO_ICMPV6, | |
482 | csum_partial(icmp6h, | |
483 | skb->len, 0)); | |
484 | ||
485 | ip6_nd_hdr(skb, saddr, daddr, inet6_sk(sk)->hop_limit, skb->len); | |
486 | ||
cfdf7647 ED |
487 | rcu_read_lock(); |
488 | idev = __in6_dev_get(dst->dev); | |
edf391ff | 489 | IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len); |
e1ec7842 | 490 | |
29a26a56 EB |
491 | err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, |
492 | net, sk, skb, NULL, dst->dev, | |
13206b6b | 493 | dst_output); |
1da177e4 | 494 | if (!err) { |
5c5d244b | 495 | ICMP6MSGOUT_INC_STATS(net, idev, type); |
a862f6a6 | 496 | ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); |
1da177e4 LT |
497 | } |
498 | ||
cfdf7647 | 499 | rcu_read_unlock(); |
1ab1457c | 500 | } |
1da177e4 | 501 | |
38cf595b | 502 | void ndisc_send_na(struct net_device *dev, const struct in6_addr *daddr, |
f564f45c CW |
503 | const struct in6_addr *solicited_addr, |
504 | bool router, bool solicited, bool override, bool inc_opt) | |
e1ec7842 | 505 | { |
b44b5f4a | 506 | struct sk_buff *skb; |
e1ec7842 YH |
507 | struct in6_addr tmpaddr; |
508 | struct inet6_ifaddr *ifp; | |
9acd9f3a | 509 | const struct in6_addr *src_addr; |
1cb3fe51 YH |
510 | struct nd_msg *msg; |
511 | int optlen = 0; | |
e1ec7842 YH |
512 | |
513 | /* for anycast or proxy, solicited_addr != src_addr */ | |
c346dca1 | 514 | ifp = ipv6_get_ifaddr(dev_net(dev), solicited_addr, dev, 1); |
e1ec7842 YH |
515 | if (ifp) { |
516 | src_addr = solicited_addr; | |
517 | if (ifp->flags & IFA_F_OPTIMISTIC) | |
f2f79cca | 518 | override = false; |
9f888160 | 519 | inc_opt |= ifp->idev->cnf.force_tllao; |
e1ec7842 YH |
520 | in6_ifa_put(ifp); |
521 | } else { | |
191cd582 | 522 | if (ipv6_dev_get_saddr(dev_net(dev), dev, daddr, |
c346dca1 | 523 | inet6_sk(dev_net(dev)->ipv6.ndisc_sk)->srcprefs, |
7cbca67c | 524 | &tmpaddr)) |
e1ec7842 YH |
525 | return; |
526 | src_addr = &tmpaddr; | |
527 | } | |
528 | ||
1cb3fe51 YH |
529 | if (!dev->addr_len) |
530 | inc_opt = 0; | |
531 | if (inc_opt) | |
f997c55c AA |
532 | optlen += ndisc_opt_addr_space(dev, |
533 | NDISC_NEIGHBOUR_ADVERTISEMENT); | |
e1ec7842 | 534 | |
1cb3fe51 | 535 | skb = ndisc_alloc_skb(dev, sizeof(*msg) + optlen); |
b44b5f4a YH |
536 | if (!skb) |
537 | return; | |
538 | ||
4df864c1 | 539 | msg = skb_put(skb, sizeof(*msg)); |
1cb3fe51 YH |
540 | *msg = (struct nd_msg) { |
541 | .icmph = { | |
542 | .icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT, | |
543 | .icmp6_router = router, | |
544 | .icmp6_solicited = solicited, | |
545 | .icmp6_override = override, | |
546 | }, | |
547 | .target = *solicited_addr, | |
548 | }; | |
549 | ||
550 | if (inc_opt) | |
551 | ndisc_fill_addr_option(skb, ND_OPT_TARGET_LL_ADDR, | |
f997c55c AA |
552 | dev->dev_addr, |
553 | NDISC_NEIGHBOUR_ADVERTISEMENT); | |
1cb3fe51 | 554 | |
b44b5f4a | 555 | ndisc_send_skb(skb, daddr, src_addr); |
e1ec7842 YH |
556 | } |
557 | ||
f47b9464 BH |
558 | static void ndisc_send_unsol_na(struct net_device *dev) |
559 | { | |
560 | struct inet6_dev *idev; | |
561 | struct inet6_ifaddr *ifa; | |
f47b9464 BH |
562 | |
563 | idev = in6_dev_get(dev); | |
564 | if (!idev) | |
565 | return; | |
566 | ||
567 | read_lock_bh(&idev->lock); | |
568 | list_for_each_entry(ifa, &idev->addr_list, if_list) { | |
38cf595b | 569 | ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifa->addr, |
f47b9464 BH |
570 | /*router=*/ !!idev->cnf.forwarding, |
571 | /*solicited=*/ false, /*override=*/ true, | |
572 | /*inc_opt=*/ true); | |
573 | } | |
574 | read_unlock_bh(&idev->lock); | |
575 | ||
576 | in6_dev_put(idev); | |
577 | } | |
578 | ||
38cf595b | 579 | void ndisc_send_ns(struct net_device *dev, const struct in6_addr *solicit, |
adc176c5 EN |
580 | const struct in6_addr *daddr, const struct in6_addr *saddr, |
581 | u64 nonce) | |
1da177e4 | 582 | { |
b44b5f4a | 583 | struct sk_buff *skb; |
1da177e4 | 584 | struct in6_addr addr_buf; |
1cb3fe51 YH |
585 | int inc_opt = dev->addr_len; |
586 | int optlen = 0; | |
587 | struct nd_msg *msg; | |
1da177e4 | 588 | |
63159f29 | 589 | if (!saddr) { |
95c385b4 NH |
590 | if (ipv6_get_lladdr(dev, &addr_buf, |
591 | (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC))) | |
1da177e4 LT |
592 | return; |
593 | saddr = &addr_buf; | |
594 | } | |
595 | ||
1cb3fe51 | 596 | if (ipv6_addr_any(saddr)) |
f2f79cca | 597 | inc_opt = false; |
1cb3fe51 | 598 | if (inc_opt) |
f997c55c AA |
599 | optlen += ndisc_opt_addr_space(dev, |
600 | NDISC_NEIGHBOUR_SOLICITATION); | |
adc176c5 EN |
601 | if (nonce != 0) |
602 | optlen += 8; | |
1cb3fe51 YH |
603 | |
604 | skb = ndisc_alloc_skb(dev, sizeof(*msg) + optlen); | |
b44b5f4a YH |
605 | if (!skb) |
606 | return; | |
607 | ||
4df864c1 | 608 | msg = skb_put(skb, sizeof(*msg)); |
1cb3fe51 YH |
609 | *msg = (struct nd_msg) { |
610 | .icmph = { | |
611 | .icmp6_type = NDISC_NEIGHBOUR_SOLICITATION, | |
612 | }, | |
613 | .target = *solicit, | |
614 | }; | |
615 | ||
616 | if (inc_opt) | |
617 | ndisc_fill_addr_option(skb, ND_OPT_SOURCE_LL_ADDR, | |
f997c55c AA |
618 | dev->dev_addr, |
619 | NDISC_NEIGHBOUR_SOLICITATION); | |
adc176c5 EN |
620 | if (nonce != 0) { |
621 | u8 *opt = skb_put(skb, 8); | |
622 | ||
623 | opt[0] = ND_OPT_NONCE; | |
624 | opt[1] = 8 >> 3; | |
625 | memcpy(opt + 2, &nonce, 6); | |
626 | } | |
1cb3fe51 | 627 | |
b44b5f4a | 628 | ndisc_send_skb(skb, daddr, saddr); |
1da177e4 LT |
629 | } |
630 | ||
9acd9f3a YH |
631 | void ndisc_send_rs(struct net_device *dev, const struct in6_addr *saddr, |
632 | const struct in6_addr *daddr) | |
1da177e4 | 633 | { |
b44b5f4a | 634 | struct sk_buff *skb; |
1cb3fe51 | 635 | struct rs_msg *msg; |
95c385b4 | 636 | int send_sllao = dev->addr_len; |
1cb3fe51 | 637 | int optlen = 0; |
95c385b4 NH |
638 | |
639 | #ifdef CONFIG_IPV6_OPTIMISTIC_DAD | |
640 | /* | |
641 | * According to section 2.2 of RFC 4429, we must not | |
642 | * send router solicitations with a sllao from | |
643 | * optimistic addresses, but we may send the solicitation | |
644 | * if we don't include the sllao. So here we check | |
645 | * if our address is optimistic, and if so, we | |
bea85195 | 646 | * suppress the inclusion of the sllao. |
95c385b4 NH |
647 | */ |
648 | if (send_sllao) { | |
c346dca1 | 649 | struct inet6_ifaddr *ifp = ipv6_get_ifaddr(dev_net(dev), saddr, |
1cab3da6 | 650 | dev, 1); |
95c385b4 NH |
651 | if (ifp) { |
652 | if (ifp->flags & IFA_F_OPTIMISTIC) { | |
ca043569 | 653 | send_sllao = 0; |
95c385b4 | 654 | } |
ca043569 | 655 | in6_ifa_put(ifp); |
95c385b4 NH |
656 | } else { |
657 | send_sllao = 0; | |
658 | } | |
659 | } | |
660 | #endif | |
1cb3fe51 | 661 | if (send_sllao) |
f997c55c | 662 | optlen += ndisc_opt_addr_space(dev, NDISC_ROUTER_SOLICITATION); |
1cb3fe51 YH |
663 | |
664 | skb = ndisc_alloc_skb(dev, sizeof(*msg) + optlen); | |
b44b5f4a YH |
665 | if (!skb) |
666 | return; | |
667 | ||
4df864c1 | 668 | msg = skb_put(skb, sizeof(*msg)); |
1cb3fe51 YH |
669 | *msg = (struct rs_msg) { |
670 | .icmph = { | |
671 | .icmp6_type = NDISC_ROUTER_SOLICITATION, | |
672 | }, | |
673 | }; | |
674 | ||
675 | if (send_sllao) | |
676 | ndisc_fill_addr_option(skb, ND_OPT_SOURCE_LL_ADDR, | |
f997c55c AA |
677 | dev->dev_addr, |
678 | NDISC_ROUTER_SOLICITATION); | |
1cb3fe51 | 679 | |
b44b5f4a | 680 | ndisc_send_skb(skb, daddr, saddr); |
1da177e4 | 681 | } |
1ab1457c | 682 | |
1da177e4 LT |
683 | |
684 | static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb) | |
685 | { | |
686 | /* | |
687 | * "The sender MUST return an ICMP | |
688 | * destination unreachable" | |
689 | */ | |
690 | dst_link_failure(skb); | |
691 | kfree_skb(skb); | |
692 | } | |
693 | ||
694 | /* Called with locked neigh: either read or both */ | |
695 | ||
696 | static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb) | |
697 | { | |
698 | struct in6_addr *saddr = NULL; | |
699 | struct in6_addr mcaddr; | |
700 | struct net_device *dev = neigh->dev; | |
701 | struct in6_addr *target = (struct in6_addr *)&neigh->primary_key; | |
702 | int probes = atomic_read(&neigh->probes); | |
703 | ||
c58da4c6 EK |
704 | if (skb && ipv6_chk_addr_and_flags(dev_net(dev), &ipv6_hdr(skb)->saddr, |
705 | dev, 1, | |
706 | IFA_F_TENTATIVE|IFA_F_OPTIMISTIC)) | |
0660e03f | 707 | saddr = &ipv6_hdr(skb)->saddr; |
e5d08d71 IM |
708 | probes -= NEIGH_VAR(neigh->parms, UCAST_PROBES); |
709 | if (probes < 0) { | |
1da177e4 | 710 | if (!(neigh->nud_state & NUD_VALID)) { |
675418d5 JP |
711 | ND_PRINTK(1, dbg, |
712 | "%s: trying to ucast probe in NUD_INVALID: %pI6\n", | |
713 | __func__, target); | |
1da177e4 | 714 | } |
adc176c5 | 715 | ndisc_send_ns(dev, target, target, saddr, 0); |
1f9248e5 | 716 | } else if ((probes -= NEIGH_VAR(neigh->parms, APP_PROBES)) < 0) { |
1da177e4 | 717 | neigh_app_ns(neigh); |
1da177e4 LT |
718 | } else { |
719 | addrconf_addr_solict_mult(target, &mcaddr); | |
adc176c5 | 720 | ndisc_send_ns(dev, target, &mcaddr, saddr, 0); |
1da177e4 LT |
721 | } |
722 | } | |
723 | ||
0736ffc0 YH |
724 | static int pndisc_is_router(const void *pkey, |
725 | struct net_device *dev) | |
fa86d322 PE |
726 | { |
727 | struct pneigh_entry *n; | |
0736ffc0 | 728 | int ret = -1; |
fa86d322 PE |
729 | |
730 | read_lock_bh(&nd_tbl.lock); | |
0736ffc0 YH |
731 | n = __pneigh_lookup(&nd_tbl, dev_net(dev), pkey, dev); |
732 | if (n) | |
733 | ret = !!(n->flags & NTF_ROUTER); | |
fa86d322 PE |
734 | read_unlock_bh(&nd_tbl.lock); |
735 | ||
0736ffc0 | 736 | return ret; |
fa86d322 PE |
737 | } |
738 | ||
f997c55c AA |
739 | void ndisc_update(const struct net_device *dev, struct neighbour *neigh, |
740 | const u8 *lladdr, u8 new, u32 flags, u8 icmp6_type, | |
741 | struct ndisc_options *ndopts) | |
742 | { | |
7b8f7a40 | 743 | neigh_update(neigh, lladdr, new, flags, 0); |
f997c55c AA |
744 | /* report ndisc ops about neighbour update */ |
745 | ndisc_ops_update(dev, neigh, flags, icmp6_type, ndopts); | |
746 | } | |
747 | ||
1da177e4 LT |
748 | static void ndisc_recv_ns(struct sk_buff *skb) |
749 | { | |
9c70220b | 750 | struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb); |
b71d1d42 ED |
751 | const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; |
752 | const struct in6_addr *daddr = &ipv6_hdr(skb)->daddr; | |
1da177e4 | 753 | u8 *lladdr = NULL; |
29a3cad5 | 754 | u32 ndoptlen = skb_tail_pointer(skb) - (skb_transport_header(skb) + |
27a884dc | 755 | offsetof(struct nd_msg, opt)); |
1da177e4 LT |
756 | struct ndisc_options ndopts; |
757 | struct net_device *dev = skb->dev; | |
758 | struct inet6_ifaddr *ifp; | |
759 | struct inet6_dev *idev = NULL; | |
760 | struct neighbour *neigh; | |
761 | int dad = ipv6_addr_any(saddr); | |
a50feda5 | 762 | bool inc; |
0736ffc0 | 763 | int is_router = -1; |
adc176c5 | 764 | u64 nonce = 0; |
1da177e4 | 765 | |
115b0aa6 YH |
766 | if (skb->len < sizeof(struct nd_msg)) { |
767 | ND_PRINTK(2, warn, "NS: packet too short\n"); | |
768 | return; | |
769 | } | |
770 | ||
1da177e4 | 771 | if (ipv6_addr_is_multicast(&msg->target)) { |
675418d5 | 772 | ND_PRINTK(2, warn, "NS: multicast target address\n"); |
1da177e4 LT |
773 | return; |
774 | } | |
775 | ||
776 | /* | |
777 | * RFC2461 7.1.1: | |
778 | * DAD has to be destined for solicited node multicast address. | |
779 | */ | |
ca97a644 | 780 | if (dad && !ipv6_addr_is_solict_mult(daddr)) { |
675418d5 | 781 | ND_PRINTK(2, warn, "NS: bad DAD packet (wrong destination)\n"); |
1da177e4 LT |
782 | return; |
783 | } | |
784 | ||
f997c55c | 785 | if (!ndisc_parse_options(dev, msg->opt, ndoptlen, &ndopts)) { |
675418d5 | 786 | ND_PRINTK(2, warn, "NS: invalid ND options\n"); |
1da177e4 LT |
787 | return; |
788 | } | |
789 | ||
790 | if (ndopts.nd_opts_src_lladdr) { | |
791 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, dev); | |
792 | if (!lladdr) { | |
675418d5 JP |
793 | ND_PRINTK(2, warn, |
794 | "NS: invalid link-layer address length\n"); | |
1da177e4 LT |
795 | return; |
796 | } | |
797 | ||
798 | /* RFC2461 7.1.1: | |
1ab1457c YH |
799 | * If the IP source address is the unspecified address, |
800 | * there MUST NOT be source link-layer address option | |
1da177e4 LT |
801 | * in the message. |
802 | */ | |
803 | if (dad) { | |
675418d5 JP |
804 | ND_PRINTK(2, warn, |
805 | "NS: bad DAD packet (link-layer address option)\n"); | |
1da177e4 LT |
806 | return; |
807 | } | |
808 | } | |
adc176c5 EN |
809 | if (ndopts.nd_opts_nonce) |
810 | memcpy(&nonce, (u8 *)(ndopts.nd_opts_nonce + 1), 6); | |
1da177e4 LT |
811 | |
812 | inc = ipv6_addr_is_multicast(daddr); | |
813 | ||
c346dca1 | 814 | ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1); |
a18bc695 | 815 | if (ifp) { |
ca254490 | 816 | have_ifp: |
95c385b4 NH |
817 | if (ifp->flags & (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC)) { |
818 | if (dad) { | |
adc176c5 EN |
819 | if (nonce != 0 && ifp->dad_nonce == nonce) { |
820 | u8 *np = (u8 *)&nonce; | |
821 | /* Matching nonce if looped back */ | |
822 | ND_PRINTK(2, notice, | |
823 | "%s: IPv6 DAD loopback for address %pI6c nonce %pM ignored\n", | |
824 | ifp->idev->dev->name, | |
825 | &ifp->addr, np); | |
826 | goto out; | |
827 | } | |
95c385b4 NH |
828 | /* |
829 | * We are colliding with another node | |
830 | * who is doing DAD | |
831 | * so fail our DAD process | |
832 | */ | |
da13c59b | 833 | addrconf_dad_failure(skb, ifp); |
9e3be4b3 | 834 | return; |
95c385b4 NH |
835 | } else { |
836 | /* | |
837 | * This is not a dad solicitation. | |
838 | * If we are an optimistic node, | |
839 | * we should respond. | |
840 | * Otherwise, we should ignore it. | |
841 | */ | |
842 | if (!(ifp->flags & IFA_F_OPTIMISTIC)) | |
1da177e4 | 843 | goto out; |
1da177e4 | 844 | } |
1da177e4 LT |
845 | } |
846 | ||
847 | idev = ifp->idev; | |
848 | } else { | |
53b7997f YH |
849 | struct net *net = dev_net(dev); |
850 | ||
ca254490 DA |
851 | /* perhaps an address on the master device */ |
852 | if (netif_is_l3_slave(dev)) { | |
853 | struct net_device *mdev; | |
854 | ||
855 | mdev = netdev_master_upper_dev_get_rcu(dev); | |
856 | if (mdev) { | |
857 | ifp = ipv6_get_ifaddr(net, &msg->target, mdev, 1); | |
858 | if (ifp) | |
859 | goto have_ifp; | |
860 | } | |
861 | } | |
862 | ||
1da177e4 LT |
863 | idev = in6_dev_get(dev); |
864 | if (!idev) { | |
865 | /* XXX: count this drop? */ | |
866 | return; | |
867 | } | |
868 | ||
53b7997f | 869 | if (ipv6_chk_acast_addr(net, dev, &msg->target) || |
1ab1457c | 870 | (idev->cnf.forwarding && |
53b7997f | 871 | (net->ipv6.devconf_all->proxy_ndp || idev->cnf.proxy_ndp) && |
0736ffc0 | 872 | (is_router = pndisc_is_router(&msg->target, dev)) >= 0)) { |
a61bbcf2 | 873 | if (!(NEIGH_CB(skb)->flags & LOCALLY_ENQUEUED) && |
1da177e4 | 874 | skb->pkt_type != PACKET_HOST && |
f2f79cca | 875 | inc && |
1f9248e5 | 876 | NEIGH_VAR(idev->nd_parms, PROXY_DELAY) != 0) { |
1da177e4 LT |
877 | /* |
878 | * for anycast or proxy, | |
1ab1457c YH |
879 | * sender should delay its response |
880 | * by a random time between 0 and | |
1da177e4 LT |
881 | * MAX_ANYCAST_DELAY_TIME seconds. |
882 | * (RFC2461) -- yoshfuji | |
883 | */ | |
884 | struct sk_buff *n = skb_clone(skb, GFP_ATOMIC); | |
885 | if (n) | |
886 | pneigh_enqueue(&nd_tbl, idev->nd_parms, n); | |
887 | goto out; | |
888 | } | |
889 | } else | |
890 | goto out; | |
891 | } | |
892 | ||
0736ffc0 | 893 | if (is_router < 0) |
fb568637 | 894 | is_router = idev->cnf.forwarding; |
62dd9318 | 895 | |
1da177e4 | 896 | if (dad) { |
38cf595b | 897 | ndisc_send_na(dev, &in6addr_linklocal_allnodes, &msg->target, |
fb568637 | 898 | !!is_router, false, (ifp != NULL), true); |
1da177e4 LT |
899 | goto out; |
900 | } | |
901 | ||
902 | if (inc) | |
903 | NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_mcast); | |
904 | else | |
905 | NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_ucast); | |
906 | ||
1ab1457c | 907 | /* |
1da177e4 LT |
908 | * update / create cache entry |
909 | * for the source address | |
910 | */ | |
911 | neigh = __neigh_lookup(&nd_tbl, saddr, dev, | |
912 | !inc || lladdr || !dev->addr_len); | |
913 | if (neigh) | |
f997c55c | 914 | ndisc_update(dev, neigh, lladdr, NUD_STALE, |
1da177e4 | 915 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
f997c55c AA |
916 | NEIGH_UPDATE_F_OVERRIDE, |
917 | NDISC_NEIGHBOUR_SOLICITATION, &ndopts); | |
3b04ddde | 918 | if (neigh || !dev->header_ops) { |
38cf595b | 919 | ndisc_send_na(dev, saddr, &msg->target, !!is_router, |
fb568637 | 920 | true, (ifp != NULL && inc), inc); |
1da177e4 LT |
921 | if (neigh) |
922 | neigh_release(neigh); | |
923 | } | |
924 | ||
925 | out: | |
926 | if (ifp) | |
927 | in6_ifa_put(ifp); | |
928 | else | |
929 | in6_dev_put(idev); | |
1da177e4 LT |
930 | } |
931 | ||
932 | static void ndisc_recv_na(struct sk_buff *skb) | |
933 | { | |
9c70220b | 934 | struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb); |
be7a010d | 935 | struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; |
b71d1d42 | 936 | const struct in6_addr *daddr = &ipv6_hdr(skb)->daddr; |
1da177e4 | 937 | u8 *lladdr = NULL; |
29a3cad5 | 938 | u32 ndoptlen = skb_tail_pointer(skb) - (skb_transport_header(skb) + |
27a884dc | 939 | offsetof(struct nd_msg, opt)); |
1da177e4 LT |
940 | struct ndisc_options ndopts; |
941 | struct net_device *dev = skb->dev; | |
7a02bf89 | 942 | struct inet6_dev *idev = __in6_dev_get(dev); |
1da177e4 LT |
943 | struct inet6_ifaddr *ifp; |
944 | struct neighbour *neigh; | |
945 | ||
946 | if (skb->len < sizeof(struct nd_msg)) { | |
675418d5 | 947 | ND_PRINTK(2, warn, "NA: packet too short\n"); |
1da177e4 LT |
948 | return; |
949 | } | |
950 | ||
951 | if (ipv6_addr_is_multicast(&msg->target)) { | |
675418d5 | 952 | ND_PRINTK(2, warn, "NA: target address is multicast\n"); |
1da177e4 LT |
953 | return; |
954 | } | |
955 | ||
956 | if (ipv6_addr_is_multicast(daddr) && | |
957 | msg->icmph.icmp6_solicited) { | |
675418d5 | 958 | ND_PRINTK(2, warn, "NA: solicited NA is multicasted\n"); |
1da177e4 LT |
959 | return; |
960 | } | |
1ab1457c | 961 | |
7a02bf89 JB |
962 | /* For some 802.11 wireless deployments (and possibly other networks), |
963 | * there will be a NA proxy and unsolicitd packets are attacks | |
964 | * and thus should not be accepted. | |
965 | */ | |
966 | if (!msg->icmph.icmp6_solicited && idev && | |
967 | idev->cnf.drop_unsolicited_na) | |
968 | return; | |
969 | ||
f997c55c | 970 | if (!ndisc_parse_options(dev, msg->opt, ndoptlen, &ndopts)) { |
675418d5 | 971 | ND_PRINTK(2, warn, "NS: invalid ND option\n"); |
1da177e4 LT |
972 | return; |
973 | } | |
974 | if (ndopts.nd_opts_tgt_lladdr) { | |
975 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, dev); | |
976 | if (!lladdr) { | |
675418d5 JP |
977 | ND_PRINTK(2, warn, |
978 | "NA: invalid link-layer address length\n"); | |
1da177e4 LT |
979 | return; |
980 | } | |
981 | } | |
c346dca1 | 982 | ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1); |
a18bc695 | 983 | if (ifp) { |
bd015928 DW |
984 | if (skb->pkt_type != PACKET_LOOPBACK |
985 | && (ifp->flags & IFA_F_TENTATIVE)) { | |
da13c59b | 986 | addrconf_dad_failure(skb, ifp); |
bd015928 | 987 | return; |
1da177e4 LT |
988 | } |
989 | /* What should we make now? The advertisement | |
990 | is invalid, but ndisc specs say nothing | |
991 | about it. It could be misconfiguration, or | |
992 | an smart proxy agent tries to help us :-) | |
24fc7b86 JS |
993 | |
994 | We should not print the error if NA has been | |
995 | received from loopback - it is just our own | |
996 | unsolicited advertisement. | |
1da177e4 | 997 | */ |
24fc7b86 | 998 | if (skb->pkt_type != PACKET_LOOPBACK) |
675418d5 | 999 | ND_PRINTK(1, warn, |
da13c59b VP |
1000 | "NA: %pM advertised our address %pI6c on %s!\n", |
1001 | eth_hdr(skb)->h_source, &ifp->addr, ifp->idev->dev->name); | |
1da177e4 LT |
1002 | in6_ifa_put(ifp); |
1003 | return; | |
1004 | } | |
1005 | neigh = neigh_lookup(&nd_tbl, &msg->target, dev); | |
1006 | ||
1007 | if (neigh) { | |
1008 | u8 old_flags = neigh->flags; | |
53b7997f | 1009 | struct net *net = dev_net(dev); |
1da177e4 LT |
1010 | |
1011 | if (neigh->nud_state & NUD_FAILED) | |
1012 | goto out; | |
1013 | ||
5f3e6e9e VN |
1014 | /* |
1015 | * Don't update the neighbor cache entry on a proxy NA from | |
1016 | * ourselves because either the proxied node is off link or it | |
1017 | * has already sent a NA to us. | |
1018 | */ | |
1019 | if (lladdr && !memcmp(lladdr, dev->dev_addr, dev->addr_len) && | |
53b7997f YH |
1020 | net->ipv6.devconf_all->forwarding && net->ipv6.devconf_all->proxy_ndp && |
1021 | pneigh_lookup(&nd_tbl, net, &msg->target, dev, 0)) { | |
b20b6d97 | 1022 | /* XXX: idev->cnf.proxy_ndp */ |
5f3e6e9e | 1023 | goto out; |
fbea49e1 | 1024 | } |
5f3e6e9e | 1025 | |
f997c55c | 1026 | ndisc_update(dev, neigh, lladdr, |
1da177e4 LT |
1027 | msg->icmph.icmp6_solicited ? NUD_REACHABLE : NUD_STALE, |
1028 | NEIGH_UPDATE_F_WEAK_OVERRIDE| | |
1029 | (msg->icmph.icmp6_override ? NEIGH_UPDATE_F_OVERRIDE : 0)| | |
1030 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
f997c55c AA |
1031 | (msg->icmph.icmp6_router ? NEIGH_UPDATE_F_ISROUTER : 0), |
1032 | NDISC_NEIGHBOUR_ADVERTISEMENT, &ndopts); | |
1da177e4 LT |
1033 | |
1034 | if ((old_flags & ~neigh->flags) & NTF_ROUTER) { | |
1035 | /* | |
1036 | * Change: router to host | |
1037 | */ | |
be7a010d | 1038 | rt6_clean_tohost(dev_net(dev), saddr); |
1da177e4 LT |
1039 | } |
1040 | ||
1041 | out: | |
1042 | neigh_release(neigh); | |
1043 | } | |
1044 | } | |
1045 | ||
1046 | static void ndisc_recv_rs(struct sk_buff *skb) | |
1047 | { | |
9c70220b | 1048 | struct rs_msg *rs_msg = (struct rs_msg *)skb_transport_header(skb); |
1da177e4 LT |
1049 | unsigned long ndoptlen = skb->len - sizeof(*rs_msg); |
1050 | struct neighbour *neigh; | |
1051 | struct inet6_dev *idev; | |
b71d1d42 | 1052 | const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; |
1da177e4 LT |
1053 | struct ndisc_options ndopts; |
1054 | u8 *lladdr = NULL; | |
1055 | ||
1056 | if (skb->len < sizeof(*rs_msg)) | |
1057 | return; | |
1058 | ||
cfdf7647 | 1059 | idev = __in6_dev_get(skb->dev); |
1da177e4 | 1060 | if (!idev) { |
675418d5 | 1061 | ND_PRINTK(1, err, "RS: can't find in6 device\n"); |
1da177e4 LT |
1062 | return; |
1063 | } | |
1064 | ||
1065 | /* Don't accept RS if we're not in router mode */ | |
1066 | if (!idev->cnf.forwarding) | |
1067 | goto out; | |
1068 | ||
1069 | /* | |
1070 | * Don't update NCE if src = ::; | |
1071 | * this implies that the source node has no ip address assigned yet. | |
1072 | */ | |
1073 | if (ipv6_addr_any(saddr)) | |
1074 | goto out; | |
1075 | ||
1076 | /* Parse ND options */ | |
f997c55c | 1077 | if (!ndisc_parse_options(skb->dev, rs_msg->opt, ndoptlen, &ndopts)) { |
675418d5 | 1078 | ND_PRINTK(2, notice, "NS: invalid ND option, ignored\n"); |
1da177e4 LT |
1079 | goto out; |
1080 | } | |
1081 | ||
1082 | if (ndopts.nd_opts_src_lladdr) { | |
1083 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, | |
1084 | skb->dev); | |
1085 | if (!lladdr) | |
1086 | goto out; | |
1087 | } | |
1088 | ||
1089 | neigh = __neigh_lookup(&nd_tbl, saddr, skb->dev, 1); | |
1090 | if (neigh) { | |
f997c55c | 1091 | ndisc_update(skb->dev, neigh, lladdr, NUD_STALE, |
1da177e4 LT |
1092 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
1093 | NEIGH_UPDATE_F_OVERRIDE| | |
f997c55c AA |
1094 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER, |
1095 | NDISC_ROUTER_SOLICITATION, &ndopts); | |
1da177e4 LT |
1096 | neigh_release(neigh); |
1097 | } | |
1098 | out: | |
cfdf7647 | 1099 | return; |
1da177e4 LT |
1100 | } |
1101 | ||
31910575 PY |
1102 | static void ndisc_ra_useropt(struct sk_buff *ra, struct nd_opt_hdr *opt) |
1103 | { | |
1104 | struct icmp6hdr *icmp6h = (struct icmp6hdr *)skb_transport_header(ra); | |
1105 | struct sk_buff *skb; | |
1106 | struct nlmsghdr *nlh; | |
1107 | struct nduseroptmsg *ndmsg; | |
c346dca1 | 1108 | struct net *net = dev_net(ra->dev); |
31910575 PY |
1109 | int err; |
1110 | int base_size = NLMSG_ALIGN(sizeof(struct nduseroptmsg) | |
1111 | + (opt->nd_opt_len << 3)); | |
1112 | size_t msg_size = base_size + nla_total_size(sizeof(struct in6_addr)); | |
1113 | ||
1114 | skb = nlmsg_new(msg_size, GFP_ATOMIC); | |
63159f29 | 1115 | if (!skb) { |
31910575 PY |
1116 | err = -ENOBUFS; |
1117 | goto errout; | |
1118 | } | |
1119 | ||
1120 | nlh = nlmsg_put(skb, 0, 0, RTM_NEWNDUSEROPT, base_size, 0); | |
63159f29 | 1121 | if (!nlh) { |
31910575 PY |
1122 | goto nla_put_failure; |
1123 | } | |
1124 | ||
1125 | ndmsg = nlmsg_data(nlh); | |
1126 | ndmsg->nduseropt_family = AF_INET6; | |
dbb2ed24 | 1127 | ndmsg->nduseropt_ifindex = ra->dev->ifindex; |
31910575 PY |
1128 | ndmsg->nduseropt_icmp_type = icmp6h->icmp6_type; |
1129 | ndmsg->nduseropt_icmp_code = icmp6h->icmp6_code; | |
1130 | ndmsg->nduseropt_opts_len = opt->nd_opt_len << 3; | |
1131 | ||
1132 | memcpy(ndmsg + 1, opt, opt->nd_opt_len << 3); | |
1133 | ||
930345ea | 1134 | if (nla_put_in6_addr(skb, NDUSEROPT_SRCADDR, &ipv6_hdr(ra)->saddr)) |
c78679e8 | 1135 | goto nla_put_failure; |
31910575 PY |
1136 | nlmsg_end(skb, nlh); |
1137 | ||
1ce85fe4 | 1138 | rtnl_notify(skb, net, 0, RTNLGRP_ND_USEROPT, NULL, GFP_ATOMIC); |
31910575 PY |
1139 | return; |
1140 | ||
1141 | nla_put_failure: | |
1142 | nlmsg_free(skb); | |
1143 | err = -EMSGSIZE; | |
1144 | errout: | |
a18bc695 | 1145 | rtnl_set_sk_err(net, RTNLGRP_ND_USEROPT, err); |
31910575 PY |
1146 | } |
1147 | ||
1da177e4 LT |
1148 | static void ndisc_router_discovery(struct sk_buff *skb) |
1149 | { | |
9c70220b | 1150 | struct ra_msg *ra_msg = (struct ra_msg *)skb_transport_header(skb); |
1da177e4 LT |
1151 | struct neighbour *neigh = NULL; |
1152 | struct inet6_dev *in6_dev; | |
65f5c7c1 | 1153 | struct rt6_info *rt = NULL; |
1da177e4 LT |
1154 | int lifetime; |
1155 | struct ndisc_options ndopts; | |
1156 | int optlen; | |
ebacaaa0 | 1157 | unsigned int pref = 0; |
a394eef5 | 1158 | __u32 old_if_flags; |
2053aeb6 | 1159 | bool send_ifinfo_notify = false; |
1da177e4 | 1160 | |
67ba4152 | 1161 | __u8 *opt = (__u8 *)(ra_msg + 1); |
1da177e4 | 1162 | |
29a3cad5 SH |
1163 | optlen = (skb_tail_pointer(skb) - skb_transport_header(skb)) - |
1164 | sizeof(struct ra_msg); | |
1da177e4 | 1165 | |
f2a762d8 BG |
1166 | ND_PRINTK(2, info, |
1167 | "RA: %s, dev: %s\n", | |
1168 | __func__, skb->dev->name); | |
0660e03f | 1169 | if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) { |
675418d5 | 1170 | ND_PRINTK(2, warn, "RA: source address is not link-local\n"); |
1da177e4 LT |
1171 | return; |
1172 | } | |
1173 | if (optlen < 0) { | |
675418d5 | 1174 | ND_PRINTK(2, warn, "RA: packet too short\n"); |
1da177e4 LT |
1175 | return; |
1176 | } | |
1177 | ||
de357cc0 | 1178 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 | 1179 | if (skb->ndisc_nodetype == NDISC_NODETYPE_HOST) { |
675418d5 | 1180 | ND_PRINTK(2, warn, "RA: from host or unauthorized router\n"); |
fadf6bf0 TF |
1181 | return; |
1182 | } | |
de357cc0 | 1183 | #endif |
fadf6bf0 | 1184 | |
1da177e4 LT |
1185 | /* |
1186 | * set the RA_RECV flag in the interface | |
1187 | */ | |
1188 | ||
cfdf7647 | 1189 | in6_dev = __in6_dev_get(skb->dev); |
63159f29 | 1190 | if (!in6_dev) { |
675418d5 JP |
1191 | ND_PRINTK(0, err, "RA: can't find inet6 device for %s\n", |
1192 | skb->dev->name); | |
1da177e4 LT |
1193 | return; |
1194 | } | |
1da177e4 | 1195 | |
f997c55c | 1196 | if (!ndisc_parse_options(skb->dev, opt, optlen, &ndopts)) { |
675418d5 | 1197 | ND_PRINTK(2, warn, "RA: invalid ND options\n"); |
1da177e4 LT |
1198 | return; |
1199 | } | |
1200 | ||
f2a762d8 BG |
1201 | if (!ipv6_accept_ra(in6_dev)) { |
1202 | ND_PRINTK(2, info, | |
1203 | "RA: %s, did not accept ra for dev: %s\n", | |
1204 | __func__, skb->dev->name); | |
31ce8c71 | 1205 | goto skip_linkparms; |
f2a762d8 | 1206 | } |
31ce8c71 | 1207 | |
de357cc0 | 1208 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 | 1209 | /* skip link-specific parameters from interior routers */ |
f2a762d8 BG |
1210 | if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT) { |
1211 | ND_PRINTK(2, info, | |
1212 | "RA: %s, nodetype is NODEFAULT, dev: %s\n", | |
1213 | __func__, skb->dev->name); | |
fadf6bf0 | 1214 | goto skip_linkparms; |
f2a762d8 | 1215 | } |
de357cc0 | 1216 | #endif |
fadf6bf0 | 1217 | |
1da177e4 LT |
1218 | if (in6_dev->if_flags & IF_RS_SENT) { |
1219 | /* | |
1220 | * flag that an RA was received after an RS was sent | |
1221 | * out on this interface. | |
1222 | */ | |
1223 | in6_dev->if_flags |= IF_RA_RCVD; | |
1224 | } | |
1225 | ||
1226 | /* | |
1227 | * Remember the managed/otherconf flags from most recently | |
1228 | * received RA message (RFC 2462) -- yoshfuji | |
1229 | */ | |
a394eef5 | 1230 | old_if_flags = in6_dev->if_flags; |
1da177e4 LT |
1231 | in6_dev->if_flags = (in6_dev->if_flags & ~(IF_RA_MANAGED | |
1232 | IF_RA_OTHERCONF)) | | |
1233 | (ra_msg->icmph.icmp6_addrconf_managed ? | |
1234 | IF_RA_MANAGED : 0) | | |
1235 | (ra_msg->icmph.icmp6_addrconf_other ? | |
1236 | IF_RA_OTHERCONF : 0); | |
1237 | ||
a394eef5 | 1238 | if (old_if_flags != in6_dev->if_flags) |
2053aeb6 | 1239 | send_ifinfo_notify = true; |
a394eef5 | 1240 | |
f2a762d8 BG |
1241 | if (!in6_dev->cnf.accept_ra_defrtr) { |
1242 | ND_PRINTK(2, info, | |
1243 | "RA: %s, defrtr is false for dev: %s\n", | |
1244 | __func__, skb->dev->name); | |
65f5c7c1 | 1245 | goto skip_defrtr; |
f2a762d8 | 1246 | } |
65f5c7c1 | 1247 | |
d9333196 BG |
1248 | /* Do not accept RA with source-addr found on local machine unless |
1249 | * accept_ra_from_local is set to true. | |
1250 | */ | |
b6428817 LR |
1251 | if (!in6_dev->cnf.accept_ra_from_local && |
1252 | ipv6_chk_addr(dev_net(in6_dev->dev), &ipv6_hdr(skb)->saddr, | |
c1a9a291 | 1253 | in6_dev->dev, 0)) { |
f2a762d8 | 1254 | ND_PRINTK(2, info, |
d9333196 BG |
1255 | "RA from local address detected on dev: %s: default router ignored\n", |
1256 | skb->dev->name); | |
9f56220f | 1257 | goto skip_defrtr; |
f2a762d8 | 1258 | } |
9f56220f | 1259 | |
1da177e4 LT |
1260 | lifetime = ntohs(ra_msg->icmph.icmp6_rt_lifetime); |
1261 | ||
ebacaaa0 YH |
1262 | #ifdef CONFIG_IPV6_ROUTER_PREF |
1263 | pref = ra_msg->icmph.icmp6_router_pref; | |
1264 | /* 10b is handled as if it were 00b (medium) */ | |
930d6ff2 | 1265 | if (pref == ICMPV6_ROUTER_PREF_INVALID || |
6d5b78cd | 1266 | !in6_dev->cnf.accept_ra_rtr_pref) |
ebacaaa0 YH |
1267 | pref = ICMPV6_ROUTER_PREF_MEDIUM; |
1268 | #endif | |
1269 | ||
0660e03f | 1270 | rt = rt6_get_dflt_router(&ipv6_hdr(skb)->saddr, skb->dev); |
1da177e4 | 1271 | |
eb857186 DM |
1272 | if (rt) { |
1273 | neigh = dst_neigh_lookup(&rt->dst, &ipv6_hdr(skb)->saddr); | |
1274 | if (!neigh) { | |
675418d5 JP |
1275 | ND_PRINTK(0, err, |
1276 | "RA: %s got default router without neighbour\n", | |
1277 | __func__); | |
94e187c0 | 1278 | ip6_rt_put(rt); |
eb857186 DM |
1279 | return; |
1280 | } | |
1281 | } | |
1da177e4 | 1282 | if (rt && lifetime == 0) { |
e0a1ad73 | 1283 | ip6_del_rt(rt); |
1da177e4 LT |
1284 | rt = NULL; |
1285 | } | |
1286 | ||
f2a762d8 BG |
1287 | ND_PRINTK(3, info, "RA: rt: %p lifetime: %d, for dev: %s\n", |
1288 | rt, lifetime, skb->dev->name); | |
63159f29 | 1289 | if (!rt && lifetime) { |
f2a762d8 | 1290 | ND_PRINTK(3, info, "RA: adding default router\n"); |
1da177e4 | 1291 | |
0660e03f | 1292 | rt = rt6_add_dflt_router(&ipv6_hdr(skb)->saddr, skb->dev, pref); |
63159f29 | 1293 | if (!rt) { |
675418d5 JP |
1294 | ND_PRINTK(0, err, |
1295 | "RA: %s failed to add default route\n", | |
1296 | __func__); | |
1da177e4 LT |
1297 | return; |
1298 | } | |
1299 | ||
eb857186 | 1300 | neigh = dst_neigh_lookup(&rt->dst, &ipv6_hdr(skb)->saddr); |
63159f29 | 1301 | if (!neigh) { |
675418d5 JP |
1302 | ND_PRINTK(0, err, |
1303 | "RA: %s got default router without neighbour\n", | |
1304 | __func__); | |
94e187c0 | 1305 | ip6_rt_put(rt); |
1da177e4 LT |
1306 | return; |
1307 | } | |
1308 | neigh->flags |= NTF_ROUTER; | |
ebacaaa0 | 1309 | } else if (rt) { |
22441cfa | 1310 | rt->rt6i_flags = (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); |
1da177e4 LT |
1311 | } |
1312 | ||
1313 | if (rt) | |
1716a961 | 1314 | rt6_set_expires(rt, jiffies + (HZ * lifetime)); |
8013d1d7 HL |
1315 | if (in6_dev->cnf.accept_ra_min_hop_limit < 256 && |
1316 | ra_msg->icmph.icmp6_hop_limit) { | |
1317 | if (in6_dev->cnf.accept_ra_min_hop_limit <= ra_msg->icmph.icmp6_hop_limit) { | |
6fd99094 | 1318 | in6_dev->cnf.hop_limit = ra_msg->icmph.icmp6_hop_limit; |
8013d1d7 HL |
1319 | if (rt) |
1320 | dst_metric_set(&rt->dst, RTAX_HOPLIMIT, | |
1321 | ra_msg->icmph.icmp6_hop_limit); | |
6fd99094 | 1322 | } else { |
8013d1d7 | 1323 | ND_PRINTK(2, warn, "RA: Got route advertisement with lower hop_limit than minimum\n"); |
6fd99094 | 1324 | } |
1da177e4 LT |
1325 | } |
1326 | ||
65f5c7c1 YH |
1327 | skip_defrtr: |
1328 | ||
1da177e4 LT |
1329 | /* |
1330 | * Update Reachable Time and Retrans Timer | |
1331 | */ | |
1332 | ||
1333 | if (in6_dev->nd_parms) { | |
1334 | unsigned long rtime = ntohl(ra_msg->retrans_timer); | |
1335 | ||
1336 | if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/HZ) { | |
1337 | rtime = (rtime*HZ)/1000; | |
1338 | if (rtime < HZ/10) | |
1339 | rtime = HZ/10; | |
1f9248e5 | 1340 | NEIGH_VAR_SET(in6_dev->nd_parms, RETRANS_TIME, rtime); |
1da177e4 | 1341 | in6_dev->tstamp = jiffies; |
2053aeb6 | 1342 | send_ifinfo_notify = true; |
1da177e4 LT |
1343 | } |
1344 | ||
1345 | rtime = ntohl(ra_msg->reachable_time); | |
1346 | if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/(3*HZ)) { | |
1347 | rtime = (rtime*HZ)/1000; | |
1348 | ||
1349 | if (rtime < HZ/10) | |
1350 | rtime = HZ/10; | |
1351 | ||
1f9248e5 JP |
1352 | if (rtime != NEIGH_VAR(in6_dev->nd_parms, BASE_REACHABLE_TIME)) { |
1353 | NEIGH_VAR_SET(in6_dev->nd_parms, | |
1354 | BASE_REACHABLE_TIME, rtime); | |
1355 | NEIGH_VAR_SET(in6_dev->nd_parms, | |
1356 | GC_STALETIME, 3 * rtime); | |
1da177e4 LT |
1357 | in6_dev->nd_parms->reachable_time = neigh_rand_reach_time(rtime); |
1358 | in6_dev->tstamp = jiffies; | |
2053aeb6 | 1359 | send_ifinfo_notify = true; |
1da177e4 LT |
1360 | } |
1361 | } | |
1362 | } | |
1363 | ||
2053aeb6 MT |
1364 | /* |
1365 | * Send a notify if RA changed managed/otherconf flags or timer settings | |
1366 | */ | |
1367 | if (send_ifinfo_notify) | |
1368 | inet6_ifinfo_notify(RTM_NEWLINK, in6_dev); | |
1369 | ||
fadf6bf0 TF |
1370 | skip_linkparms: |
1371 | ||
1da177e4 LT |
1372 | /* |
1373 | * Process options. | |
1374 | */ | |
1375 | ||
1376 | if (!neigh) | |
0660e03f | 1377 | neigh = __neigh_lookup(&nd_tbl, &ipv6_hdr(skb)->saddr, |
1da177e4 LT |
1378 | skb->dev, 1); |
1379 | if (neigh) { | |
1380 | u8 *lladdr = NULL; | |
1381 | if (ndopts.nd_opts_src_lladdr) { | |
1382 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, | |
1383 | skb->dev); | |
1384 | if (!lladdr) { | |
675418d5 JP |
1385 | ND_PRINTK(2, warn, |
1386 | "RA: invalid link-layer address length\n"); | |
1da177e4 LT |
1387 | goto out; |
1388 | } | |
1389 | } | |
f997c55c | 1390 | ndisc_update(skb->dev, neigh, lladdr, NUD_STALE, |
1da177e4 LT |
1391 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
1392 | NEIGH_UPDATE_F_OVERRIDE| | |
1393 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
f997c55c AA |
1394 | NEIGH_UPDATE_F_ISROUTER, |
1395 | NDISC_ROUTER_ADVERTISEMENT, &ndopts); | |
1da177e4 LT |
1396 | } |
1397 | ||
f2a762d8 BG |
1398 | if (!ipv6_accept_ra(in6_dev)) { |
1399 | ND_PRINTK(2, info, | |
1400 | "RA: %s, accept_ra is false for dev: %s\n", | |
1401 | __func__, skb->dev->name); | |
31ce8c71 | 1402 | goto out; |
f2a762d8 | 1403 | } |
31ce8c71 | 1404 | |
70ceb4f5 | 1405 | #ifdef CONFIG_IPV6_ROUTE_INFO |
b6428817 LR |
1406 | if (!in6_dev->cnf.accept_ra_from_local && |
1407 | ipv6_chk_addr(dev_net(in6_dev->dev), &ipv6_hdr(skb)->saddr, | |
c1a9a291 | 1408 | in6_dev->dev, 0)) { |
f2a762d8 | 1409 | ND_PRINTK(2, info, |
d9333196 BG |
1410 | "RA from local address detected on dev: %s: router info ignored.\n", |
1411 | skb->dev->name); | |
9f56220f | 1412 | goto skip_routeinfo; |
f2a762d8 | 1413 | } |
9f56220f | 1414 | |
09c884d4 | 1415 | if (in6_dev->cnf.accept_ra_rtr_pref && ndopts.nd_opts_ri) { |
70ceb4f5 YH |
1416 | struct nd_opt_hdr *p; |
1417 | for (p = ndopts.nd_opts_ri; | |
1418 | p; | |
1419 | p = ndisc_next_option(p, ndopts.nd_opts_ri_end)) { | |
6294e000 YH |
1420 | struct route_info *ri = (struct route_info *)p; |
1421 | #ifdef CONFIG_IPV6_NDISC_NODETYPE | |
1422 | if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT && | |
1423 | ri->prefix_len == 0) | |
1424 | continue; | |
1425 | #endif | |
30e56918 DJ |
1426 | if (ri->prefix_len == 0 && |
1427 | !in6_dev->cnf.accept_ra_defrtr) | |
1428 | continue; | |
bbea124b JS |
1429 | if (ri->prefix_len < in6_dev->cnf.accept_ra_rt_info_min_plen) |
1430 | continue; | |
6294e000 | 1431 | if (ri->prefix_len > in6_dev->cnf.accept_ra_rt_info_max_plen) |
09c884d4 | 1432 | continue; |
67ba4152 | 1433 | rt6_route_rcv(skb->dev, (u8 *)p, (p->nd_opt_len) << 3, |
0660e03f | 1434 | &ipv6_hdr(skb)->saddr); |
70ceb4f5 YH |
1435 | } |
1436 | } | |
9f56220f AH |
1437 | |
1438 | skip_routeinfo: | |
70ceb4f5 YH |
1439 | #endif |
1440 | ||
de357cc0 | 1441 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 | 1442 | /* skip link-specific ndopts from interior routers */ |
f2a762d8 BG |
1443 | if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT) { |
1444 | ND_PRINTK(2, info, | |
1445 | "RA: %s, nodetype is NODEFAULT (interior routes), dev: %s\n", | |
1446 | __func__, skb->dev->name); | |
fadf6bf0 | 1447 | goto out; |
f2a762d8 | 1448 | } |
de357cc0 | 1449 | #endif |
fadf6bf0 | 1450 | |
c4fd30eb | 1451 | if (in6_dev->cnf.accept_ra_pinfo && ndopts.nd_opts_pi) { |
1da177e4 LT |
1452 | struct nd_opt_hdr *p; |
1453 | for (p = ndopts.nd_opts_pi; | |
1454 | p; | |
1455 | p = ndisc_next_option(p, ndopts.nd_opts_pi_end)) { | |
e6bff995 NH |
1456 | addrconf_prefix_rcv(skb->dev, (u8 *)p, |
1457 | (p->nd_opt_len) << 3, | |
1458 | ndopts.nd_opts_src_lladdr != NULL); | |
1da177e4 LT |
1459 | } |
1460 | } | |
1461 | ||
c2943f14 | 1462 | if (ndopts.nd_opts_mtu && in6_dev->cnf.accept_ra_mtu) { |
e69a4adc | 1463 | __be32 n; |
1da177e4 LT |
1464 | u32 mtu; |
1465 | ||
67ba4152 | 1466 | memcpy(&n, ((u8 *)(ndopts.nd_opts_mtu+1))+2, sizeof(mtu)); |
e69a4adc | 1467 | mtu = ntohl(n); |
1da177e4 LT |
1468 | |
1469 | if (mtu < IPV6_MIN_MTU || mtu > skb->dev->mtu) { | |
675418d5 | 1470 | ND_PRINTK(2, warn, "RA: invalid mtu: %d\n", mtu); |
1da177e4 LT |
1471 | } else if (in6_dev->cnf.mtu6 != mtu) { |
1472 | in6_dev->cnf.mtu6 = mtu; | |
1473 | ||
1474 | if (rt) | |
defb3519 | 1475 | dst_metric_set(&rt->dst, RTAX_MTU, mtu); |
1da177e4 LT |
1476 | |
1477 | rt6_mtu_change(skb->dev, mtu); | |
1478 | } | |
1479 | } | |
1ab1457c | 1480 | |
31910575 | 1481 | if (ndopts.nd_useropts) { |
61cf46ad YH |
1482 | struct nd_opt_hdr *p; |
1483 | for (p = ndopts.nd_useropts; | |
1484 | p; | |
f997c55c AA |
1485 | p = ndisc_next_useropt(skb->dev, p, |
1486 | ndopts.nd_useropts_end)) { | |
61cf46ad | 1487 | ndisc_ra_useropt(skb, p); |
31910575 PY |
1488 | } |
1489 | } | |
1490 | ||
1da177e4 | 1491 | if (ndopts.nd_opts_tgt_lladdr || ndopts.nd_opts_rh) { |
675418d5 | 1492 | ND_PRINTK(2, warn, "RA: invalid RA options\n"); |
1da177e4 LT |
1493 | } |
1494 | out: | |
94e187c0 | 1495 | ip6_rt_put(rt); |
eb857186 | 1496 | if (neigh) |
1da177e4 | 1497 | neigh_release(neigh); |
1da177e4 LT |
1498 | } |
1499 | ||
1500 | static void ndisc_redirect_rcv(struct sk_buff *skb) | |
1501 | { | |
093d04d4 DJ |
1502 | u8 *hdr; |
1503 | struct ndisc_options ndopts; | |
1504 | struct rd_msg *msg = (struct rd_msg *)skb_transport_header(skb); | |
29a3cad5 | 1505 | u32 ndoptlen = skb_tail_pointer(skb) - (skb_transport_header(skb) + |
093d04d4 DJ |
1506 | offsetof(struct rd_msg, opt)); |
1507 | ||
de357cc0 | 1508 | #ifdef CONFIG_IPV6_NDISC_NODETYPE |
fadf6bf0 TF |
1509 | switch (skb->ndisc_nodetype) { |
1510 | case NDISC_NODETYPE_HOST: | |
1511 | case NDISC_NODETYPE_NODEFAULT: | |
675418d5 JP |
1512 | ND_PRINTK(2, warn, |
1513 | "Redirect: from host or unauthorized router\n"); | |
fadf6bf0 TF |
1514 | return; |
1515 | } | |
de357cc0 | 1516 | #endif |
fadf6bf0 | 1517 | |
0660e03f | 1518 | if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) { |
675418d5 JP |
1519 | ND_PRINTK(2, warn, |
1520 | "Redirect: source address is not link-local\n"); | |
1da177e4 LT |
1521 | return; |
1522 | } | |
1523 | ||
f997c55c | 1524 | if (!ndisc_parse_options(skb->dev, msg->opt, ndoptlen, &ndopts)) |
093d04d4 DJ |
1525 | return; |
1526 | ||
c92a59ec | 1527 | if (!ndopts.nd_opts_rh) { |
b55b76b2 DJ |
1528 | ip6_redirect_no_header(skb, dev_net(skb->dev), |
1529 | skb->dev->ifindex, 0); | |
093d04d4 | 1530 | return; |
c92a59ec | 1531 | } |
093d04d4 DJ |
1532 | |
1533 | hdr = (u8 *)ndopts.nd_opts_rh; | |
1534 | hdr += 8; | |
1535 | if (!pskb_pull(skb, hdr - skb_transport_header(skb))) | |
1536 | return; | |
1537 | ||
b94f1c09 | 1538 | icmpv6_notify(skb, NDISC_REDIRECT, 0, 0); |
1da177e4 LT |
1539 | } |
1540 | ||
5f5a0115 YH |
1541 | static void ndisc_fill_redirect_hdr_option(struct sk_buff *skb, |
1542 | struct sk_buff *orig_skb, | |
1543 | int rd_len) | |
9c86dafe | 1544 | { |
5f5a0115 YH |
1545 | u8 *opt = skb_put(skb, rd_len); |
1546 | ||
9c86dafe YH |
1547 | memset(opt, 0, 8); |
1548 | *(opt++) = ND_OPT_REDIRECT_HDR; | |
1549 | *(opt++) = (rd_len >> 3); | |
1550 | opt += 6; | |
1551 | ||
1552 | memcpy(opt, ipv6_hdr(orig_skb), rd_len - 8); | |
9c86dafe YH |
1553 | } |
1554 | ||
4991969a | 1555 | void ndisc_send_redirect(struct sk_buff *skb, const struct in6_addr *target) |
1da177e4 | 1556 | { |
1762f7e8 | 1557 | struct net_device *dev = skb->dev; |
c346dca1 | 1558 | struct net *net = dev_net(dev); |
1762f7e8 | 1559 | struct sock *sk = net->ipv6.ndisc_sk; |
2ce13576 | 1560 | int optlen = 0; |
fbfe95a4 | 1561 | struct inet_peer *peer; |
1da177e4 | 1562 | struct sk_buff *buff; |
71bcdba0 | 1563 | struct rd_msg *msg; |
1da177e4 | 1564 | struct in6_addr saddr_buf; |
1da177e4 LT |
1565 | struct rt6_info *rt; |
1566 | struct dst_entry *dst; | |
4c9483b2 | 1567 | struct flowi6 fl6; |
1da177e4 | 1568 | int rd_len; |
f997c55c AA |
1569 | u8 ha_buf[MAX_ADDR_LEN], *ha = NULL, |
1570 | ops_data_buf[NDISC_OPS_REDIRECT_DATA_SPACE], *ops_data = NULL; | |
1d861aa4 | 1571 | bool ret; |
1da177e4 | 1572 | |
95c385b4 | 1573 | if (ipv6_get_lladdr(dev, &saddr_buf, IFA_F_TENTATIVE)) { |
675418d5 JP |
1574 | ND_PRINTK(2, warn, "Redirect: no link-local address on %s\n", |
1575 | dev->name); | |
1ab1457c YH |
1576 | return; |
1577 | } | |
1da177e4 | 1578 | |
0660e03f | 1579 | if (!ipv6_addr_equal(&ipv6_hdr(skb)->daddr, target) && |
bf0b48df | 1580 | ipv6_addr_type(target) != (IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) { |
675418d5 JP |
1581 | ND_PRINTK(2, warn, |
1582 | "Redirect: target address is not link-local unicast\n"); | |
29556526 LY |
1583 | return; |
1584 | } | |
1585 | ||
4c9483b2 | 1586 | icmpv6_flow_init(sk, &fl6, NDISC_REDIRECT, |
e0d56fdd | 1587 | &saddr_buf, &ipv6_hdr(skb)->saddr, dev->ifindex); |
1da177e4 | 1588 | |
4c9483b2 | 1589 | dst = ip6_route_output(net, NULL, &fl6); |
5095d64d RL |
1590 | if (dst->error) { |
1591 | dst_release(dst); | |
1da177e4 | 1592 | return; |
5095d64d | 1593 | } |
4c9483b2 | 1594 | dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), NULL, 0); |
452edd59 | 1595 | if (IS_ERR(dst)) |
1da177e4 | 1596 | return; |
1da177e4 LT |
1597 | |
1598 | rt = (struct rt6_info *) dst; | |
1599 | ||
1600 | if (rt->rt6i_flags & RTF_GATEWAY) { | |
675418d5 JP |
1601 | ND_PRINTK(2, warn, |
1602 | "Redirect: destination is not a neighbour\n"); | |
d73f0801 | 1603 | goto release; |
1da177e4 | 1604 | } |
fd0273d7 | 1605 | peer = inet_getpeer_v6(net->ipv6.peers, &ipv6_hdr(skb)->saddr, 1); |
1d861aa4 DM |
1606 | ret = inet_peer_xrlim_allow(peer, 1*HZ); |
1607 | if (peer) | |
1608 | inet_putpeer(peer); | |
1609 | if (!ret) | |
d73f0801 | 1610 | goto release; |
1da177e4 LT |
1611 | |
1612 | if (dev->addr_len) { | |
4991969a DM |
1613 | struct neighbour *neigh = dst_neigh_lookup(skb_dst(skb), target); |
1614 | if (!neigh) { | |
675418d5 JP |
1615 | ND_PRINTK(2, warn, |
1616 | "Redirect: no neigh for target address\n"); | |
4991969a DM |
1617 | goto release; |
1618 | } | |
1619 | ||
1da177e4 LT |
1620 | read_lock_bh(&neigh->lock); |
1621 | if (neigh->nud_state & NUD_VALID) { | |
1622 | memcpy(ha_buf, neigh->ha, dev->addr_len); | |
1623 | read_unlock_bh(&neigh->lock); | |
1624 | ha = ha_buf; | |
f997c55c AA |
1625 | optlen += ndisc_redirect_opt_addr_space(dev, neigh, |
1626 | ops_data_buf, | |
1627 | &ops_data); | |
1da177e4 LT |
1628 | } else |
1629 | read_unlock_bh(&neigh->lock); | |
4991969a DM |
1630 | |
1631 | neigh_release(neigh); | |
1da177e4 LT |
1632 | } |
1633 | ||
1634 | rd_len = min_t(unsigned int, | |
2ce13576 YH |
1635 | IPV6_MIN_MTU - sizeof(struct ipv6hdr) - sizeof(*msg) - optlen, |
1636 | skb->len + 8); | |
1da177e4 | 1637 | rd_len &= ~0x7; |
2ce13576 | 1638 | optlen += rd_len; |
1da177e4 | 1639 | |
2ce13576 | 1640 | buff = ndisc_alloc_skb(dev, sizeof(*msg) + optlen); |
de09334b | 1641 | if (!buff) |
d73f0801 | 1642 | goto release; |
1da177e4 | 1643 | |
4df864c1 | 1644 | msg = skb_put(buff, sizeof(*msg)); |
4d5c152e YH |
1645 | *msg = (struct rd_msg) { |
1646 | .icmph = { | |
1647 | .icmp6_type = NDISC_REDIRECT, | |
1648 | }, | |
1649 | .target = *target, | |
1650 | .dest = ipv6_hdr(skb)->daddr, | |
1651 | }; | |
1da177e4 | 1652 | |
1da177e4 LT |
1653 | /* |
1654 | * include target_address option | |
1655 | */ | |
1656 | ||
1657 | if (ha) | |
f997c55c | 1658 | ndisc_fill_redirect_addr_option(buff, ha, ops_data); |
1da177e4 LT |
1659 | |
1660 | /* | |
1661 | * build redirect option and copy skb over to the new packet. | |
1662 | */ | |
1663 | ||
9c86dafe | 1664 | if (rd_len) |
5f5a0115 | 1665 | ndisc_fill_redirect_hdr_option(buff, skb, rd_len); |
1da177e4 | 1666 | |
adf30907 | 1667 | skb_dst_set(buff, dst); |
f4de84c6 | 1668 | ndisc_send_skb(buff, &ipv6_hdr(skb)->saddr, &saddr_buf); |
d73f0801 IJ |
1669 | return; |
1670 | ||
1671 | release: | |
1672 | dst_release(dst); | |
1da177e4 LT |
1673 | } |
1674 | ||
1675 | static void pndisc_redo(struct sk_buff *skb) | |
1676 | { | |
140e26fc | 1677 | ndisc_recv_ns(skb); |
1da177e4 LT |
1678 | kfree_skb(skb); |
1679 | } | |
1680 | ||
b800c3b9 HFS |
1681 | static bool ndisc_suppress_frag_ndisc(struct sk_buff *skb) |
1682 | { | |
1683 | struct inet6_dev *idev = __in6_dev_get(skb->dev); | |
1684 | ||
1685 | if (!idev) | |
1686 | return true; | |
1687 | if (IP6CB(skb)->flags & IP6SKB_FRAGMENTED && | |
1688 | idev->cnf.suppress_frag_ndisc) { | |
1689 | net_warn_ratelimited("Received fragmented ndisc packet. Carefully consider disabling suppress_frag_ndisc.\n"); | |
1690 | return true; | |
1691 | } | |
1692 | return false; | |
1693 | } | |
1694 | ||
1da177e4 LT |
1695 | int ndisc_rcv(struct sk_buff *skb) |
1696 | { | |
1697 | struct nd_msg *msg; | |
1698 | ||
b800c3b9 HFS |
1699 | if (ndisc_suppress_frag_ndisc(skb)) |
1700 | return 0; | |
1701 | ||
6bce6b4e | 1702 | if (skb_linearize(skb)) |
1da177e4 LT |
1703 | return 0; |
1704 | ||
9c70220b | 1705 | msg = (struct nd_msg *)skb_transport_header(skb); |
1da177e4 | 1706 | |
9c70220b | 1707 | __skb_push(skb, skb->data - skb_transport_header(skb)); |
1da177e4 | 1708 | |
0660e03f | 1709 | if (ipv6_hdr(skb)->hop_limit != 255) { |
675418d5 JP |
1710 | ND_PRINTK(2, warn, "NDISC: invalid hop-limit: %d\n", |
1711 | ipv6_hdr(skb)->hop_limit); | |
1da177e4 LT |
1712 | return 0; |
1713 | } | |
1714 | ||
1715 | if (msg->icmph.icmp6_code != 0) { | |
675418d5 JP |
1716 | ND_PRINTK(2, warn, "NDISC: invalid ICMPv6 code: %d\n", |
1717 | msg->icmph.icmp6_code); | |
1da177e4 LT |
1718 | return 0; |
1719 | } | |
1720 | ||
a61bbcf2 PM |
1721 | memset(NEIGH_CB(skb), 0, sizeof(struct neighbour_cb)); |
1722 | ||
1da177e4 LT |
1723 | switch (msg->icmph.icmp6_type) { |
1724 | case NDISC_NEIGHBOUR_SOLICITATION: | |
1725 | ndisc_recv_ns(skb); | |
1726 | break; | |
1727 | ||
1728 | case NDISC_NEIGHBOUR_ADVERTISEMENT: | |
1729 | ndisc_recv_na(skb); | |
1730 | break; | |
1731 | ||
1732 | case NDISC_ROUTER_SOLICITATION: | |
1733 | ndisc_recv_rs(skb); | |
1734 | break; | |
1735 | ||
1736 | case NDISC_ROUTER_ADVERTISEMENT: | |
1737 | ndisc_router_discovery(skb); | |
1738 | break; | |
1739 | ||
1740 | case NDISC_REDIRECT: | |
1741 | ndisc_redirect_rcv(skb); | |
1742 | break; | |
3ff50b79 | 1743 | } |
1da177e4 LT |
1744 | |
1745 | return 0; | |
1746 | } | |
1747 | ||
1748 | static int ndisc_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1749 | { | |
351638e7 | 1750 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
c8507fb2 | 1751 | struct netdev_notifier_change_info *change_info; |
c346dca1 | 1752 | struct net *net = dev_net(dev); |
5cb04436 | 1753 | struct inet6_dev *idev; |
1da177e4 LT |
1754 | |
1755 | switch (event) { | |
1756 | case NETDEV_CHANGEADDR: | |
1757 | neigh_changeaddr(&nd_tbl, dev); | |
2ac3ac8f | 1758 | fib6_run_gc(0, net, false); |
4a6e3c5d DA |
1759 | /* fallthrough */ |
1760 | case NETDEV_UP: | |
5cb04436 HFS |
1761 | idev = in6_dev_get(dev); |
1762 | if (!idev) | |
1763 | break; | |
fc1f8f4f DA |
1764 | if (idev->cnf.ndisc_notify || |
1765 | net->ipv6.devconf_all->ndisc_notify) | |
5cb04436 HFS |
1766 | ndisc_send_unsol_na(dev); |
1767 | in6_dev_put(idev); | |
1da177e4 | 1768 | break; |
c8507fb2 ED |
1769 | case NETDEV_CHANGE: |
1770 | change_info = ptr; | |
1771 | if (change_info->flags_changed & IFF_NOARP) | |
1772 | neigh_changeaddr(&nd_tbl, dev); | |
1773 | break; | |
1da177e4 LT |
1774 | case NETDEV_DOWN: |
1775 | neigh_ifdown(&nd_tbl, dev); | |
2ac3ac8f | 1776 | fib6_run_gc(0, net, false); |
1da177e4 | 1777 | break; |
f47b9464 BH |
1778 | case NETDEV_NOTIFY_PEERS: |
1779 | ndisc_send_unsol_na(dev); | |
1780 | break; | |
1da177e4 LT |
1781 | default: |
1782 | break; | |
1783 | } | |
1784 | ||
1785 | return NOTIFY_DONE; | |
1786 | } | |
1787 | ||
1788 | static struct notifier_block ndisc_netdev_notifier = { | |
1789 | .notifier_call = ndisc_netdev_event, | |
6eb79393 | 1790 | .priority = ADDRCONF_NOTIFY_PRIORITY - 5, |
1da177e4 LT |
1791 | }; |
1792 | ||
1793 | #ifdef CONFIG_SYSCTL | |
1794 | static void ndisc_warn_deprecated_sysctl(struct ctl_table *ctl, | |
1795 | const char *func, const char *dev_name) | |
1796 | { | |
1797 | static char warncomm[TASK_COMM_LEN]; | |
1798 | static int warned; | |
1799 | if (strcmp(warncomm, current->comm) && warned < 5) { | |
1800 | strcpy(warncomm, current->comm); | |
f3213831 | 1801 | 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 |
1802 | warncomm, func, |
1803 | dev_name, ctl->procname, | |
1804 | dev_name, ctl->procname); | |
1805 | warned++; | |
1806 | } | |
1807 | } | |
1808 | ||
8d65af78 | 1809 | int ndisc_ifinfo_sysctl_change(struct ctl_table *ctl, int write, void __user *buffer, size_t *lenp, loff_t *ppos) |
1da177e4 LT |
1810 | { |
1811 | struct net_device *dev = ctl->extra1; | |
1812 | struct inet6_dev *idev; | |
1813 | int ret; | |
1814 | ||
d12af679 EB |
1815 | if ((strcmp(ctl->procname, "retrans_time") == 0) || |
1816 | (strcmp(ctl->procname, "base_reachable_time") == 0)) | |
1da177e4 LT |
1817 | ndisc_warn_deprecated_sysctl(ctl, "syscall", dev ? dev->name : "default"); |
1818 | ||
d12af679 | 1819 | if (strcmp(ctl->procname, "retrans_time") == 0) |
cb5b09c1 | 1820 | ret = neigh_proc_dointvec(ctl, write, buffer, lenp, ppos); |
d12af679 EB |
1821 | |
1822 | else if (strcmp(ctl->procname, "base_reachable_time") == 0) | |
cb5b09c1 JP |
1823 | ret = neigh_proc_dointvec_jiffies(ctl, write, |
1824 | buffer, lenp, ppos); | |
d12af679 EB |
1825 | |
1826 | else if ((strcmp(ctl->procname, "retrans_time_ms") == 0) || | |
ad02ac14 | 1827 | (strcmp(ctl->procname, "base_reachable_time_ms") == 0)) |
cb5b09c1 JP |
1828 | ret = neigh_proc_dointvec_ms_jiffies(ctl, write, |
1829 | buffer, lenp, ppos); | |
d12af679 | 1830 | else |
1da177e4 | 1831 | ret = -1; |
1da177e4 LT |
1832 | |
1833 | if (write && ret == 0 && dev && (idev = in6_dev_get(dev)) != NULL) { | |
1f9248e5 JP |
1834 | if (ctl->data == &NEIGH_VAR(idev->nd_parms, BASE_REACHABLE_TIME)) |
1835 | idev->nd_parms->reachable_time = | |
1836 | neigh_rand_reach_time(NEIGH_VAR(idev->nd_parms, BASE_REACHABLE_TIME)); | |
1da177e4 LT |
1837 | idev->tstamp = jiffies; |
1838 | inet6_ifinfo_notify(RTM_NEWLINK, idev); | |
1839 | in6_dev_put(idev); | |
1840 | } | |
1841 | return ret; | |
1842 | } | |
1843 | ||
1da177e4 LT |
1844 | |
1845 | #endif | |
1846 | ||
2c8c1e72 | 1847 | static int __net_init ndisc_net_init(struct net *net) |
1da177e4 LT |
1848 | { |
1849 | struct ipv6_pinfo *np; | |
1850 | struct sock *sk; | |
1ab1457c | 1851 | int err; |
1da177e4 | 1852 | |
1ed8516f DL |
1853 | err = inet_ctl_sock_create(&sk, PF_INET6, |
1854 | SOCK_RAW, IPPROTO_ICMPV6, net); | |
1da177e4 | 1855 | if (err < 0) { |
675418d5 JP |
1856 | ND_PRINTK(0, err, |
1857 | "NDISC: Failed to initialize the control socket (err %d)\n", | |
1858 | err); | |
1da177e4 LT |
1859 | return err; |
1860 | } | |
1861 | ||
1ed8516f | 1862 | net->ipv6.ndisc_sk = sk; |
1762f7e8 | 1863 | |
1da177e4 | 1864 | np = inet6_sk(sk); |
1da177e4 LT |
1865 | np->hop_limit = 255; |
1866 | /* Do not loopback ndisc messages */ | |
1867 | np->mc_loop = 0; | |
1da177e4 | 1868 | |
1762f7e8 DL |
1869 | return 0; |
1870 | } | |
1871 | ||
2c8c1e72 | 1872 | static void __net_exit ndisc_net_exit(struct net *net) |
1762f7e8 | 1873 | { |
1ed8516f | 1874 | inet_ctl_sock_destroy(net->ipv6.ndisc_sk); |
1762f7e8 DL |
1875 | } |
1876 | ||
1877 | static struct pernet_operations ndisc_net_ops = { | |
1878 | .init = ndisc_net_init, | |
1879 | .exit = ndisc_net_exit, | |
1880 | }; | |
1881 | ||
1882 | int __init ndisc_init(void) | |
1883 | { | |
1884 | int err; | |
1885 | ||
1886 | err = register_pernet_subsys(&ndisc_net_ops); | |
1887 | if (err) | |
1888 | return err; | |
1ab1457c YH |
1889 | /* |
1890 | * Initialize the neighbour table | |
1891 | */ | |
d7480fd3 | 1892 | neigh_table_init(NEIGH_ND_TABLE, &nd_tbl); |
1da177e4 LT |
1893 | |
1894 | #ifdef CONFIG_SYSCTL | |
73af614a | 1895 | err = neigh_sysctl_register(NULL, &nd_tbl.parms, |
56ec0fb1 | 1896 | ndisc_ifinfo_sysctl_change); |
1762f7e8 DL |
1897 | if (err) |
1898 | goto out_unregister_pernet; | |
1762f7e8 | 1899 | out: |
bcd081a3 | 1900 | #endif |
1762f7e8 | 1901 | return err; |
1da177e4 | 1902 | |
1762f7e8 | 1903 | #ifdef CONFIG_SYSCTL |
1762f7e8 | 1904 | out_unregister_pernet: |
1762f7e8 DL |
1905 | unregister_pernet_subsys(&ndisc_net_ops); |
1906 | goto out; | |
2c861cc6 | 1907 | #endif |
1da177e4 LT |
1908 | } |
1909 | ||
2c861cc6 MK |
1910 | int __init ndisc_late_init(void) |
1911 | { | |
1912 | return register_netdevice_notifier(&ndisc_netdev_notifier); | |
1913 | } | |
1914 | ||
1915 | void ndisc_late_cleanup(void) | |
1da177e4 | 1916 | { |
36f73d0c | 1917 | unregister_netdevice_notifier(&ndisc_netdev_notifier); |
2c861cc6 MK |
1918 | } |
1919 | ||
1920 | void ndisc_cleanup(void) | |
1921 | { | |
1da177e4 LT |
1922 | #ifdef CONFIG_SYSCTL |
1923 | neigh_sysctl_unregister(&nd_tbl.parms); | |
1924 | #endif | |
d7480fd3 | 1925 | neigh_table_clear(NEIGH_ND_TABLE, &nd_tbl); |
1762f7e8 | 1926 | unregister_pernet_subsys(&ndisc_net_ops); |
1da177e4 | 1927 | } |