Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Neighbour Discovery for IPv6 | |
3 | * Linux INET6 implementation | |
4 | * | |
5 | * Authors: | |
6 | * Pedro Roque <roque@di.fc.ul.pt> | |
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 | * | |
18 | * Lars Fenneberg : fixed MTU setting on receipt | |
19 | * of an RA. | |
20 | * | |
21 | * Janos Farkas : kmalloc failure checks | |
22 | * Alexey Kuznetsov : state machine reworked | |
23 | * and moved to net/core. | |
24 | * Pekka Savola : RFC2461 validation | |
25 | * YOSHIFUJI Hideaki @USAGI : Verify ND options properly | |
26 | */ | |
27 | ||
28 | /* Set to 3 to get tracing... */ | |
29 | #define ND_DEBUG 1 | |
30 | ||
31 | #define ND_PRINTK(fmt, args...) do { if (net_ratelimit()) { printk(fmt, ## args); } } while(0) | |
32 | #define ND_NOPRINTK(x...) do { ; } while(0) | |
33 | #define ND_PRINTK0 ND_PRINTK | |
34 | #define ND_PRINTK1 ND_NOPRINTK | |
35 | #define ND_PRINTK2 ND_NOPRINTK | |
36 | #define ND_PRINTK3 ND_NOPRINTK | |
37 | #if ND_DEBUG >= 1 | |
38 | #undef ND_PRINTK1 | |
39 | #define ND_PRINTK1 ND_PRINTK | |
40 | #endif | |
41 | #if ND_DEBUG >= 2 | |
42 | #undef ND_PRINTK2 | |
43 | #define ND_PRINTK2 ND_PRINTK | |
44 | #endif | |
45 | #if ND_DEBUG >= 3 | |
46 | #undef ND_PRINTK3 | |
47 | #define ND_PRINTK3 ND_PRINTK | |
48 | #endif | |
49 | ||
50 | #include <linux/module.h> | |
1da177e4 LT |
51 | #include <linux/errno.h> |
52 | #include <linux/types.h> | |
53 | #include <linux/socket.h> | |
54 | #include <linux/sockios.h> | |
55 | #include <linux/sched.h> | |
56 | #include <linux/net.h> | |
57 | #include <linux/in6.h> | |
58 | #include <linux/route.h> | |
59 | #include <linux/init.h> | |
60 | #include <linux/rcupdate.h> | |
61 | #ifdef CONFIG_SYSCTL | |
62 | #include <linux/sysctl.h> | |
63 | #endif | |
64 | ||
1823730f | 65 | #include <linux/if_addr.h> |
1da177e4 LT |
66 | #include <linux/if_arp.h> |
67 | #include <linux/ipv6.h> | |
68 | #include <linux/icmpv6.h> | |
69 | #include <linux/jhash.h> | |
70 | ||
71 | #include <net/sock.h> | |
72 | #include <net/snmp.h> | |
73 | ||
74 | #include <net/ipv6.h> | |
75 | #include <net/protocol.h> | |
76 | #include <net/ndisc.h> | |
77 | #include <net/ip6_route.h> | |
78 | #include <net/addrconf.h> | |
79 | #include <net/icmp.h> | |
80 | ||
81 | #include <net/flow.h> | |
82 | #include <net/ip6_checksum.h> | |
83 | #include <linux/proc_fs.h> | |
84 | ||
85 | #include <linux/netfilter.h> | |
86 | #include <linux/netfilter_ipv6.h> | |
87 | ||
88 | static struct socket *ndisc_socket; | |
89 | ||
90 | static u32 ndisc_hash(const void *pkey, const struct net_device *dev); | |
91 | static int ndisc_constructor(struct neighbour *neigh); | |
92 | static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb); | |
93 | static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb); | |
94 | static int pndisc_constructor(struct pneigh_entry *n); | |
95 | static void pndisc_destructor(struct pneigh_entry *n); | |
96 | static void pndisc_redo(struct sk_buff *skb); | |
97 | ||
98 | static struct neigh_ops ndisc_generic_ops = { | |
99 | .family = AF_INET6, | |
100 | .solicit = ndisc_solicit, | |
101 | .error_report = ndisc_error_report, | |
102 | .output = neigh_resolve_output, | |
103 | .connected_output = neigh_connected_output, | |
104 | .hh_output = dev_queue_xmit, | |
105 | .queue_xmit = dev_queue_xmit, | |
106 | }; | |
107 | ||
108 | static struct neigh_ops ndisc_hh_ops = { | |
109 | .family = AF_INET6, | |
110 | .solicit = ndisc_solicit, | |
111 | .error_report = ndisc_error_report, | |
112 | .output = neigh_resolve_output, | |
113 | .connected_output = neigh_resolve_output, | |
114 | .hh_output = dev_queue_xmit, | |
115 | .queue_xmit = dev_queue_xmit, | |
116 | }; | |
117 | ||
118 | ||
119 | static struct neigh_ops ndisc_direct_ops = { | |
120 | .family = AF_INET6, | |
121 | .output = dev_queue_xmit, | |
122 | .connected_output = dev_queue_xmit, | |
123 | .hh_output = dev_queue_xmit, | |
124 | .queue_xmit = dev_queue_xmit, | |
125 | }; | |
126 | ||
127 | struct neigh_table nd_tbl = { | |
128 | .family = AF_INET6, | |
129 | .entry_size = sizeof(struct neighbour) + sizeof(struct in6_addr), | |
130 | .key_len = sizeof(struct in6_addr), | |
131 | .hash = ndisc_hash, | |
132 | .constructor = ndisc_constructor, | |
133 | .pconstructor = pndisc_constructor, | |
134 | .pdestructor = pndisc_destructor, | |
135 | .proxy_redo = pndisc_redo, | |
136 | .id = "ndisc_cache", | |
137 | .parms = { | |
138 | .tbl = &nd_tbl, | |
139 | .base_reachable_time = 30 * HZ, | |
140 | .retrans_time = 1 * HZ, | |
141 | .gc_staletime = 60 * HZ, | |
142 | .reachable_time = 30 * HZ, | |
143 | .delay_probe_time = 5 * HZ, | |
144 | .queue_len = 3, | |
145 | .ucast_probes = 3, | |
146 | .mcast_probes = 3, | |
147 | .anycast_delay = 1 * HZ, | |
148 | .proxy_delay = (8 * HZ) / 10, | |
149 | .proxy_qlen = 64, | |
150 | }, | |
151 | .gc_interval = 30 * HZ, | |
152 | .gc_thresh1 = 128, | |
153 | .gc_thresh2 = 512, | |
154 | .gc_thresh3 = 1024, | |
155 | }; | |
156 | ||
157 | /* ND options */ | |
158 | struct ndisc_options { | |
70ceb4f5 YH |
159 | struct nd_opt_hdr *nd_opt_array[__ND_OPT_ARRAY_MAX]; |
160 | #ifdef CONFIG_IPV6_ROUTE_INFO | |
161 | struct nd_opt_hdr *nd_opts_ri; | |
162 | struct nd_opt_hdr *nd_opts_ri_end; | |
163 | #endif | |
1da177e4 LT |
164 | }; |
165 | ||
166 | #define nd_opts_src_lladdr nd_opt_array[ND_OPT_SOURCE_LL_ADDR] | |
167 | #define nd_opts_tgt_lladdr nd_opt_array[ND_OPT_TARGET_LL_ADDR] | |
168 | #define nd_opts_pi nd_opt_array[ND_OPT_PREFIX_INFO] | |
169 | #define nd_opts_pi_end nd_opt_array[__ND_OPT_PREFIX_INFO_END] | |
170 | #define nd_opts_rh nd_opt_array[ND_OPT_REDIRECT_HDR] | |
171 | #define nd_opts_mtu nd_opt_array[ND_OPT_MTU] | |
172 | ||
173 | #define NDISC_OPT_SPACE(len) (((len)+2+7)&~7) | |
174 | ||
175 | /* | |
176 | * Return the padding between the option length and the start of the | |
177 | * link addr. Currently only IP-over-InfiniBand needs this, although | |
178 | * if RFC 3831 IPv6-over-Fibre Channel is ever implemented it may | |
179 | * also need a pad of 2. | |
180 | */ | |
181 | static int ndisc_addr_option_pad(unsigned short type) | |
182 | { | |
183 | switch (type) { | |
184 | case ARPHRD_INFINIBAND: return 2; | |
185 | default: return 0; | |
186 | } | |
187 | } | |
188 | ||
189 | static inline int ndisc_opt_addr_space(struct net_device *dev) | |
190 | { | |
191 | return NDISC_OPT_SPACE(dev->addr_len + ndisc_addr_option_pad(dev->type)); | |
192 | } | |
193 | ||
194 | static u8 *ndisc_fill_addr_option(u8 *opt, int type, void *data, int data_len, | |
195 | unsigned short addr_type) | |
196 | { | |
197 | int space = NDISC_OPT_SPACE(data_len); | |
198 | int pad = ndisc_addr_option_pad(addr_type); | |
199 | ||
200 | opt[0] = type; | |
201 | opt[1] = space>>3; | |
202 | ||
203 | memset(opt + 2, 0, pad); | |
204 | opt += pad; | |
205 | space -= pad; | |
206 | ||
207 | memcpy(opt+2, data, data_len); | |
208 | data_len += 2; | |
209 | opt += data_len; | |
210 | if ((space -= data_len) > 0) | |
211 | memset(opt, 0, space); | |
212 | return opt + space; | |
213 | } | |
214 | ||
215 | static struct nd_opt_hdr *ndisc_next_option(struct nd_opt_hdr *cur, | |
216 | struct nd_opt_hdr *end) | |
217 | { | |
218 | int type; | |
219 | if (!cur || !end || cur >= end) | |
220 | return NULL; | |
221 | type = cur->nd_opt_type; | |
222 | do { | |
223 | cur = ((void *)cur) + (cur->nd_opt_len << 3); | |
224 | } while(cur < end && cur->nd_opt_type != type); | |
225 | return (cur <= end && cur->nd_opt_type == type ? cur : NULL); | |
226 | } | |
227 | ||
228 | static struct ndisc_options *ndisc_parse_options(u8 *opt, int opt_len, | |
229 | struct ndisc_options *ndopts) | |
230 | { | |
231 | struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)opt; | |
232 | ||
233 | if (!nd_opt || opt_len < 0 || !ndopts) | |
234 | return NULL; | |
235 | memset(ndopts, 0, sizeof(*ndopts)); | |
236 | while (opt_len) { | |
237 | int l; | |
238 | if (opt_len < sizeof(struct nd_opt_hdr)) | |
239 | return NULL; | |
240 | l = nd_opt->nd_opt_len << 3; | |
241 | if (opt_len < l || l == 0) | |
242 | return NULL; | |
243 | switch (nd_opt->nd_opt_type) { | |
244 | case ND_OPT_SOURCE_LL_ADDR: | |
245 | case ND_OPT_TARGET_LL_ADDR: | |
246 | case ND_OPT_MTU: | |
247 | case ND_OPT_REDIRECT_HDR: | |
248 | if (ndopts->nd_opt_array[nd_opt->nd_opt_type]) { | |
249 | ND_PRINTK2(KERN_WARNING | |
250 | "%s(): duplicated ND6 option found: type=%d\n", | |
251 | __FUNCTION__, | |
252 | nd_opt->nd_opt_type); | |
253 | } else { | |
254 | ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt; | |
255 | } | |
256 | break; | |
257 | case ND_OPT_PREFIX_INFO: | |
258 | ndopts->nd_opts_pi_end = nd_opt; | |
259 | if (ndopts->nd_opt_array[nd_opt->nd_opt_type] == 0) | |
260 | ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt; | |
261 | break; | |
70ceb4f5 YH |
262 | #ifdef CONFIG_IPV6_ROUTE_INFO |
263 | case ND_OPT_ROUTE_INFO: | |
264 | ndopts->nd_opts_ri_end = nd_opt; | |
265 | if (!ndopts->nd_opts_ri) | |
266 | ndopts->nd_opts_ri = nd_opt; | |
267 | break; | |
268 | #endif | |
1da177e4 LT |
269 | default: |
270 | /* | |
271 | * Unknown options must be silently ignored, | |
272 | * to accommodate future extension to the protocol. | |
273 | */ | |
274 | ND_PRINTK2(KERN_NOTICE | |
275 | "%s(): ignored unsupported option; type=%d, len=%d\n", | |
276 | __FUNCTION__, | |
277 | nd_opt->nd_opt_type, nd_opt->nd_opt_len); | |
278 | } | |
279 | opt_len -= l; | |
280 | nd_opt = ((void *)nd_opt) + l; | |
281 | } | |
282 | return ndopts; | |
283 | } | |
284 | ||
285 | static inline u8 *ndisc_opt_addr_data(struct nd_opt_hdr *p, | |
286 | struct net_device *dev) | |
287 | { | |
288 | u8 *lladdr = (u8 *)(p + 1); | |
289 | int lladdrlen = p->nd_opt_len << 3; | |
290 | int prepad = ndisc_addr_option_pad(dev->type); | |
291 | if (lladdrlen != NDISC_OPT_SPACE(dev->addr_len + prepad)) | |
292 | return NULL; | |
293 | return (lladdr + prepad); | |
294 | } | |
295 | ||
296 | int ndisc_mc_map(struct in6_addr *addr, char *buf, struct net_device *dev, int dir) | |
297 | { | |
298 | switch (dev->type) { | |
299 | case ARPHRD_ETHER: | |
300 | case ARPHRD_IEEE802: /* Not sure. Check it later. --ANK */ | |
301 | case ARPHRD_FDDI: | |
302 | ipv6_eth_mc_map(addr, buf); | |
303 | return 0; | |
304 | case ARPHRD_IEEE802_TR: | |
305 | ipv6_tr_mc_map(addr,buf); | |
306 | return 0; | |
307 | case ARPHRD_ARCNET: | |
308 | ipv6_arcnet_mc_map(addr, buf); | |
309 | return 0; | |
310 | case ARPHRD_INFINIBAND: | |
311 | ipv6_ib_mc_map(addr, buf); | |
312 | return 0; | |
313 | default: | |
314 | if (dir) { | |
315 | memcpy(buf, dev->broadcast, dev->addr_len); | |
316 | return 0; | |
317 | } | |
318 | } | |
319 | return -EINVAL; | |
320 | } | |
321 | ||
322 | static u32 ndisc_hash(const void *pkey, const struct net_device *dev) | |
323 | { | |
324 | const u32 *p32 = pkey; | |
325 | u32 addr_hash, i; | |
326 | ||
327 | addr_hash = 0; | |
328 | for (i = 0; i < (sizeof(struct in6_addr) / sizeof(u32)); i++) | |
329 | addr_hash ^= *p32++; | |
330 | ||
331 | return jhash_2words(addr_hash, dev->ifindex, nd_tbl.hash_rnd); | |
332 | } | |
333 | ||
334 | static int ndisc_constructor(struct neighbour *neigh) | |
335 | { | |
336 | struct in6_addr *addr = (struct in6_addr*)&neigh->primary_key; | |
337 | struct net_device *dev = neigh->dev; | |
338 | struct inet6_dev *in6_dev; | |
339 | struct neigh_parms *parms; | |
340 | int is_multicast = ipv6_addr_is_multicast(addr); | |
341 | ||
342 | rcu_read_lock(); | |
343 | in6_dev = in6_dev_get(dev); | |
344 | if (in6_dev == NULL) { | |
345 | rcu_read_unlock(); | |
346 | return -EINVAL; | |
347 | } | |
348 | ||
349 | parms = in6_dev->nd_parms; | |
350 | __neigh_parms_put(neigh->parms); | |
351 | neigh->parms = neigh_parms_clone(parms); | |
352 | rcu_read_unlock(); | |
353 | ||
354 | neigh->type = is_multicast ? RTN_MULTICAST : RTN_UNICAST; | |
355 | if (dev->hard_header == NULL) { | |
356 | neigh->nud_state = NUD_NOARP; | |
357 | neigh->ops = &ndisc_direct_ops; | |
358 | neigh->output = neigh->ops->queue_xmit; | |
359 | } else { | |
360 | if (is_multicast) { | |
361 | neigh->nud_state = NUD_NOARP; | |
362 | ndisc_mc_map(addr, neigh->ha, dev, 1); | |
363 | } else if (dev->flags&(IFF_NOARP|IFF_LOOPBACK)) { | |
364 | neigh->nud_state = NUD_NOARP; | |
365 | memcpy(neigh->ha, dev->dev_addr, dev->addr_len); | |
366 | if (dev->flags&IFF_LOOPBACK) | |
367 | neigh->type = RTN_LOCAL; | |
368 | } else if (dev->flags&IFF_POINTOPOINT) { | |
369 | neigh->nud_state = NUD_NOARP; | |
370 | memcpy(neigh->ha, dev->broadcast, dev->addr_len); | |
371 | } | |
372 | if (dev->hard_header_cache) | |
373 | neigh->ops = &ndisc_hh_ops; | |
374 | else | |
375 | neigh->ops = &ndisc_generic_ops; | |
376 | if (neigh->nud_state&NUD_VALID) | |
377 | neigh->output = neigh->ops->connected_output; | |
378 | else | |
379 | neigh->output = neigh->ops->output; | |
380 | } | |
381 | in6_dev_put(in6_dev); | |
382 | return 0; | |
383 | } | |
384 | ||
385 | static int pndisc_constructor(struct pneigh_entry *n) | |
386 | { | |
387 | struct in6_addr *addr = (struct in6_addr*)&n->key; | |
388 | struct in6_addr maddr; | |
389 | struct net_device *dev = n->dev; | |
390 | ||
391 | if (dev == NULL || __in6_dev_get(dev) == NULL) | |
392 | return -EINVAL; | |
393 | addrconf_addr_solict_mult(addr, &maddr); | |
394 | ipv6_dev_mc_inc(dev, &maddr); | |
395 | return 0; | |
396 | } | |
397 | ||
398 | static void pndisc_destructor(struct pneigh_entry *n) | |
399 | { | |
400 | struct in6_addr *addr = (struct in6_addr*)&n->key; | |
401 | struct in6_addr maddr; | |
402 | struct net_device *dev = n->dev; | |
403 | ||
404 | if (dev == NULL || __in6_dev_get(dev) == NULL) | |
405 | return; | |
406 | addrconf_addr_solict_mult(addr, &maddr); | |
407 | ipv6_dev_mc_dec(dev, &maddr); | |
408 | } | |
409 | ||
410 | /* | |
411 | * Send a Neighbour Advertisement | |
412 | */ | |
413 | ||
414 | static inline void ndisc_flow_init(struct flowi *fl, u8 type, | |
af184765 YH |
415 | struct in6_addr *saddr, struct in6_addr *daddr, |
416 | int oif) | |
1da177e4 LT |
417 | { |
418 | memset(fl, 0, sizeof(*fl)); | |
419 | ipv6_addr_copy(&fl->fl6_src, saddr); | |
420 | ipv6_addr_copy(&fl->fl6_dst, daddr); | |
421 | fl->proto = IPPROTO_ICMPV6; | |
422 | fl->fl_icmp_type = type; | |
423 | fl->fl_icmp_code = 0; | |
af184765 | 424 | fl->oif = oif; |
beb8d13b | 425 | security_sk_classify_flow(ndisc_socket->sk, fl); |
1da177e4 LT |
426 | } |
427 | ||
428 | static void ndisc_send_na(struct net_device *dev, struct neighbour *neigh, | |
429 | struct in6_addr *daddr, struct in6_addr *solicited_addr, | |
430 | int router, int solicited, int override, int inc_opt) | |
431 | { | |
432 | struct in6_addr tmpaddr; | |
433 | struct inet6_ifaddr *ifp; | |
434 | struct inet6_dev *idev; | |
435 | struct flowi fl; | |
436 | struct dst_entry* dst; | |
437 | struct sock *sk = ndisc_socket->sk; | |
438 | struct in6_addr *src_addr; | |
439 | struct nd_msg *msg; | |
440 | int len; | |
441 | struct sk_buff *skb; | |
442 | int err; | |
443 | ||
444 | len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr); | |
445 | ||
446 | /* for anycast or proxy, solicited_addr != src_addr */ | |
447 | ifp = ipv6_get_ifaddr(solicited_addr, dev, 1); | |
448 | if (ifp) { | |
449 | src_addr = solicited_addr; | |
450 | in6_ifa_put(ifp); | |
451 | } else { | |
452 | if (ipv6_dev_get_saddr(dev, daddr, &tmpaddr)) | |
453 | return; | |
454 | src_addr = &tmpaddr; | |
455 | } | |
456 | ||
af184765 YH |
457 | ndisc_flow_init(&fl, NDISC_NEIGHBOUR_ADVERTISEMENT, src_addr, daddr, |
458 | dev->ifindex); | |
1da177e4 LT |
459 | |
460 | dst = ndisc_dst_alloc(dev, neigh, daddr, ip6_output); | |
461 | if (!dst) | |
462 | return; | |
463 | ||
464 | err = xfrm_lookup(&dst, &fl, NULL, 0); | |
e104411b | 465 | if (err < 0) |
1da177e4 | 466 | return; |
1da177e4 LT |
467 | |
468 | if (inc_opt) { | |
469 | if (dev->addr_len) | |
470 | len += ndisc_opt_addr_space(dev); | |
471 | else | |
472 | inc_opt = 0; | |
473 | } | |
474 | ||
d54a81d3 DM |
475 | skb = sock_alloc_send_skb(sk, |
476 | (MAX_HEADER + sizeof(struct ipv6hdr) + | |
477 | len + LL_RESERVED_SPACE(dev)), | |
1da177e4 LT |
478 | 1, &err); |
479 | ||
480 | if (skb == NULL) { | |
481 | ND_PRINTK0(KERN_ERR | |
482 | "ICMPv6 NA: %s() failed to allocate an skb.\n", | |
483 | __FUNCTION__); | |
484 | dst_release(dst); | |
485 | return; | |
486 | } | |
487 | ||
488 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); | |
489 | ip6_nd_hdr(sk, skb, dev, src_addr, daddr, IPPROTO_ICMPV6, len); | |
490 | ||
491 | msg = (struct nd_msg *)skb_put(skb, len); | |
492 | skb->h.raw = (unsigned char*)msg; | |
493 | ||
494 | msg->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT; | |
495 | msg->icmph.icmp6_code = 0; | |
496 | msg->icmph.icmp6_cksum = 0; | |
497 | ||
498 | msg->icmph.icmp6_unused = 0; | |
499 | msg->icmph.icmp6_router = router; | |
500 | msg->icmph.icmp6_solicited = solicited; | |
fc26d0ab | 501 | msg->icmph.icmp6_override = override; |
1da177e4 LT |
502 | |
503 | /* Set the target address. */ | |
504 | ipv6_addr_copy(&msg->target, solicited_addr); | |
505 | ||
506 | if (inc_opt) | |
507 | ndisc_fill_addr_option(msg->opt, ND_OPT_TARGET_LL_ADDR, dev->dev_addr, | |
508 | dev->addr_len, dev->type); | |
509 | ||
510 | /* checksum */ | |
511 | msg->icmph.icmp6_cksum = csum_ipv6_magic(src_addr, daddr, len, | |
512 | IPPROTO_ICMPV6, | |
513 | csum_partial((__u8 *) msg, | |
514 | len, 0)); | |
515 | ||
516 | skb->dst = dst; | |
517 | idev = in6_dev_get(dst->dev); | |
a11d206d | 518 | IP6_INC_STATS(idev, IPSTATS_MIB_OUTREQUESTS); |
1da177e4 LT |
519 | err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, dst->dev, dst_output); |
520 | if (!err) { | |
521 | ICMP6_INC_STATS(idev, ICMP6_MIB_OUTNEIGHBORADVERTISEMENTS); | |
522 | ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS); | |
523 | } | |
524 | ||
525 | if (likely(idev != NULL)) | |
526 | in6_dev_put(idev); | |
527 | } | |
528 | ||
529 | void ndisc_send_ns(struct net_device *dev, struct neighbour *neigh, | |
530 | struct in6_addr *solicit, | |
531 | struct in6_addr *daddr, struct in6_addr *saddr) | |
532 | { | |
533 | struct flowi fl; | |
534 | struct dst_entry* dst; | |
535 | struct inet6_dev *idev; | |
536 | struct sock *sk = ndisc_socket->sk; | |
537 | struct sk_buff *skb; | |
538 | struct nd_msg *msg; | |
539 | struct in6_addr addr_buf; | |
540 | int len; | |
541 | int err; | |
542 | int send_llinfo; | |
543 | ||
544 | if (saddr == NULL) { | |
545 | if (ipv6_get_lladdr(dev, &addr_buf)) | |
546 | return; | |
547 | saddr = &addr_buf; | |
548 | } | |
549 | ||
af184765 YH |
550 | ndisc_flow_init(&fl, NDISC_NEIGHBOUR_SOLICITATION, saddr, daddr, |
551 | dev->ifindex); | |
1da177e4 LT |
552 | |
553 | dst = ndisc_dst_alloc(dev, neigh, daddr, ip6_output); | |
554 | if (!dst) | |
555 | return; | |
556 | ||
557 | err = xfrm_lookup(&dst, &fl, NULL, 0); | |
e104411b | 558 | if (err < 0) |
1da177e4 | 559 | return; |
1da177e4 LT |
560 | |
561 | len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr); | |
562 | send_llinfo = dev->addr_len && !ipv6_addr_any(saddr); | |
563 | if (send_llinfo) | |
564 | len += ndisc_opt_addr_space(dev); | |
565 | ||
d54a81d3 DM |
566 | skb = sock_alloc_send_skb(sk, |
567 | (MAX_HEADER + sizeof(struct ipv6hdr) + | |
568 | len + LL_RESERVED_SPACE(dev)), | |
1da177e4 LT |
569 | 1, &err); |
570 | if (skb == NULL) { | |
571 | ND_PRINTK0(KERN_ERR | |
572 | "ICMPv6 NA: %s() failed to allocate an skb.\n", | |
573 | __FUNCTION__); | |
574 | dst_release(dst); | |
575 | return; | |
576 | } | |
577 | ||
578 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); | |
579 | ip6_nd_hdr(sk, skb, dev, saddr, daddr, IPPROTO_ICMPV6, len); | |
580 | ||
581 | msg = (struct nd_msg *)skb_put(skb, len); | |
582 | skb->h.raw = (unsigned char*)msg; | |
583 | msg->icmph.icmp6_type = NDISC_NEIGHBOUR_SOLICITATION; | |
584 | msg->icmph.icmp6_code = 0; | |
585 | msg->icmph.icmp6_cksum = 0; | |
586 | msg->icmph.icmp6_unused = 0; | |
587 | ||
588 | /* Set the target address. */ | |
589 | ipv6_addr_copy(&msg->target, solicit); | |
590 | ||
591 | if (send_llinfo) | |
592 | ndisc_fill_addr_option(msg->opt, ND_OPT_SOURCE_LL_ADDR, dev->dev_addr, | |
593 | dev->addr_len, dev->type); | |
594 | ||
595 | /* checksum */ | |
596 | msg->icmph.icmp6_cksum = csum_ipv6_magic(&skb->nh.ipv6h->saddr, | |
597 | daddr, len, | |
598 | IPPROTO_ICMPV6, | |
599 | csum_partial((__u8 *) msg, | |
600 | len, 0)); | |
601 | /* send it! */ | |
602 | skb->dst = dst; | |
603 | idev = in6_dev_get(dst->dev); | |
a11d206d | 604 | IP6_INC_STATS(idev, IPSTATS_MIB_OUTREQUESTS); |
1da177e4 LT |
605 | err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, dst->dev, dst_output); |
606 | if (!err) { | |
607 | ICMP6_INC_STATS(idev, ICMP6_MIB_OUTNEIGHBORSOLICITS); | |
608 | ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS); | |
609 | } | |
610 | ||
611 | if (likely(idev != NULL)) | |
612 | in6_dev_put(idev); | |
613 | } | |
614 | ||
615 | void ndisc_send_rs(struct net_device *dev, struct in6_addr *saddr, | |
616 | struct in6_addr *daddr) | |
617 | { | |
618 | struct flowi fl; | |
619 | struct dst_entry* dst; | |
620 | struct inet6_dev *idev; | |
621 | struct sock *sk = ndisc_socket->sk; | |
622 | struct sk_buff *skb; | |
623 | struct icmp6hdr *hdr; | |
624 | __u8 * opt; | |
625 | int len; | |
626 | int err; | |
627 | ||
af184765 YH |
628 | ndisc_flow_init(&fl, NDISC_ROUTER_SOLICITATION, saddr, daddr, |
629 | dev->ifindex); | |
1da177e4 LT |
630 | |
631 | dst = ndisc_dst_alloc(dev, NULL, daddr, ip6_output); | |
632 | if (!dst) | |
633 | return; | |
634 | ||
635 | err = xfrm_lookup(&dst, &fl, NULL, 0); | |
e104411b | 636 | if (err < 0) |
1da177e4 | 637 | return; |
1da177e4 LT |
638 | |
639 | len = sizeof(struct icmp6hdr); | |
640 | if (dev->addr_len) | |
641 | len += ndisc_opt_addr_space(dev); | |
642 | ||
d54a81d3 DM |
643 | skb = sock_alloc_send_skb(sk, |
644 | (MAX_HEADER + sizeof(struct ipv6hdr) + | |
645 | len + LL_RESERVED_SPACE(dev)), | |
1da177e4 LT |
646 | 1, &err); |
647 | if (skb == NULL) { | |
648 | ND_PRINTK0(KERN_ERR | |
649 | "ICMPv6 RS: %s() failed to allocate an skb.\n", | |
650 | __FUNCTION__); | |
651 | dst_release(dst); | |
652 | return; | |
653 | } | |
654 | ||
655 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); | |
656 | ip6_nd_hdr(sk, skb, dev, saddr, daddr, IPPROTO_ICMPV6, len); | |
657 | ||
658 | hdr = (struct icmp6hdr *)skb_put(skb, len); | |
659 | skb->h.raw = (unsigned char*)hdr; | |
660 | hdr->icmp6_type = NDISC_ROUTER_SOLICITATION; | |
661 | hdr->icmp6_code = 0; | |
662 | hdr->icmp6_cksum = 0; | |
663 | hdr->icmp6_unused = 0; | |
664 | ||
665 | opt = (u8*) (hdr + 1); | |
666 | ||
667 | if (dev->addr_len) | |
668 | ndisc_fill_addr_option(opt, ND_OPT_SOURCE_LL_ADDR, dev->dev_addr, | |
669 | dev->addr_len, dev->type); | |
670 | ||
671 | /* checksum */ | |
672 | hdr->icmp6_cksum = csum_ipv6_magic(&skb->nh.ipv6h->saddr, daddr, len, | |
673 | IPPROTO_ICMPV6, | |
674 | csum_partial((__u8 *) hdr, len, 0)); | |
675 | ||
676 | /* send it! */ | |
677 | skb->dst = dst; | |
678 | idev = in6_dev_get(dst->dev); | |
a11d206d | 679 | IP6_INC_STATS(idev, IPSTATS_MIB_OUTREQUESTS); |
1da177e4 LT |
680 | err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, dst->dev, dst_output); |
681 | if (!err) { | |
682 | ICMP6_INC_STATS(idev, ICMP6_MIB_OUTROUTERSOLICITS); | |
683 | ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS); | |
684 | } | |
685 | ||
686 | if (likely(idev != NULL)) | |
687 | in6_dev_put(idev); | |
688 | } | |
689 | ||
690 | ||
691 | static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb) | |
692 | { | |
693 | /* | |
694 | * "The sender MUST return an ICMP | |
695 | * destination unreachable" | |
696 | */ | |
697 | dst_link_failure(skb); | |
698 | kfree_skb(skb); | |
699 | } | |
700 | ||
701 | /* Called with locked neigh: either read or both */ | |
702 | ||
703 | static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb) | |
704 | { | |
705 | struct in6_addr *saddr = NULL; | |
706 | struct in6_addr mcaddr; | |
707 | struct net_device *dev = neigh->dev; | |
708 | struct in6_addr *target = (struct in6_addr *)&neigh->primary_key; | |
709 | int probes = atomic_read(&neigh->probes); | |
710 | ||
711 | if (skb && ipv6_chk_addr(&skb->nh.ipv6h->saddr, dev, 1)) | |
712 | saddr = &skb->nh.ipv6h->saddr; | |
713 | ||
714 | if ((probes -= neigh->parms->ucast_probes) < 0) { | |
715 | if (!(neigh->nud_state & NUD_VALID)) { | |
716 | ND_PRINTK1(KERN_DEBUG | |
717 | "%s(): trying to ucast probe in NUD_INVALID: " | |
46b86a2d | 718 | NIP6_FMT "\n", |
1da177e4 LT |
719 | __FUNCTION__, |
720 | NIP6(*target)); | |
721 | } | |
722 | ndisc_send_ns(dev, neigh, target, target, saddr); | |
723 | } else if ((probes -= neigh->parms->app_probes) < 0) { | |
724 | #ifdef CONFIG_ARPD | |
725 | neigh_app_ns(neigh); | |
726 | #endif | |
727 | } else { | |
728 | addrconf_addr_solict_mult(target, &mcaddr); | |
729 | ndisc_send_ns(dev, NULL, target, &mcaddr, saddr); | |
730 | } | |
731 | } | |
732 | ||
733 | static void ndisc_recv_ns(struct sk_buff *skb) | |
734 | { | |
735 | struct nd_msg *msg = (struct nd_msg *)skb->h.raw; | |
736 | struct in6_addr *saddr = &skb->nh.ipv6h->saddr; | |
737 | struct in6_addr *daddr = &skb->nh.ipv6h->daddr; | |
738 | u8 *lladdr = NULL; | |
739 | u32 ndoptlen = skb->tail - msg->opt; | |
740 | struct ndisc_options ndopts; | |
741 | struct net_device *dev = skb->dev; | |
742 | struct inet6_ifaddr *ifp; | |
743 | struct inet6_dev *idev = NULL; | |
744 | struct neighbour *neigh; | |
62dd9318 | 745 | struct pneigh_entry *pneigh = NULL; |
1da177e4 LT |
746 | int dad = ipv6_addr_any(saddr); |
747 | int inc; | |
62dd9318 | 748 | int is_router; |
1da177e4 LT |
749 | |
750 | if (ipv6_addr_is_multicast(&msg->target)) { | |
751 | ND_PRINTK2(KERN_WARNING | |
752 | "ICMPv6 NS: multicast target address"); | |
753 | return; | |
754 | } | |
755 | ||
756 | /* | |
757 | * RFC2461 7.1.1: | |
758 | * DAD has to be destined for solicited node multicast address. | |
759 | */ | |
760 | if (dad && | |
761 | !(daddr->s6_addr32[0] == htonl(0xff020000) && | |
762 | daddr->s6_addr32[1] == htonl(0x00000000) && | |
763 | daddr->s6_addr32[2] == htonl(0x00000001) && | |
764 | daddr->s6_addr [12] == 0xff )) { | |
765 | ND_PRINTK2(KERN_WARNING | |
766 | "ICMPv6 NS: bad DAD packet (wrong destination)\n"); | |
767 | return; | |
768 | } | |
769 | ||
770 | if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) { | |
771 | ND_PRINTK2(KERN_WARNING | |
772 | "ICMPv6 NS: invalid ND options\n"); | |
773 | return; | |
774 | } | |
775 | ||
776 | if (ndopts.nd_opts_src_lladdr) { | |
777 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, dev); | |
778 | if (!lladdr) { | |
779 | ND_PRINTK2(KERN_WARNING | |
780 | "ICMPv6 NS: invalid link-layer address length\n"); | |
781 | return; | |
782 | } | |
783 | ||
784 | /* RFC2461 7.1.1: | |
785 | * If the IP source address is the unspecified address, | |
786 | * there MUST NOT be source link-layer address option | |
787 | * in the message. | |
788 | */ | |
789 | if (dad) { | |
790 | ND_PRINTK2(KERN_WARNING | |
791 | "ICMPv6 NS: bad DAD packet (link-layer address option)\n"); | |
792 | return; | |
793 | } | |
794 | } | |
795 | ||
796 | inc = ipv6_addr_is_multicast(daddr); | |
797 | ||
798 | if ((ifp = ipv6_get_ifaddr(&msg->target, dev, 1)) != NULL) { | |
799 | if (ifp->flags & IFA_F_TENTATIVE) { | |
800 | /* Address is tentative. If the source | |
801 | is unspecified address, it is someone | |
802 | does DAD, otherwise we ignore solicitations | |
803 | until DAD timer expires. | |
804 | */ | |
805 | if (!dad) | |
806 | goto out; | |
807 | if (dev->type == ARPHRD_IEEE802_TR) { | |
808 | unsigned char *sadr = skb->mac.raw; | |
809 | if (((sadr[8] ^ dev->dev_addr[0]) & 0x7f) == 0 && | |
810 | sadr[9] == dev->dev_addr[1] && | |
811 | sadr[10] == dev->dev_addr[2] && | |
812 | sadr[11] == dev->dev_addr[3] && | |
813 | sadr[12] == dev->dev_addr[4] && | |
814 | sadr[13] == dev->dev_addr[5]) { | |
815 | /* looped-back to us */ | |
816 | goto out; | |
817 | } | |
818 | } | |
819 | addrconf_dad_failure(ifp); | |
820 | return; | |
821 | } | |
822 | ||
823 | idev = ifp->idev; | |
824 | } else { | |
825 | idev = in6_dev_get(dev); | |
826 | if (!idev) { | |
827 | /* XXX: count this drop? */ | |
828 | return; | |
829 | } | |
830 | ||
831 | if (ipv6_chk_acast_addr(dev, &msg->target) || | |
832 | (idev->cnf.forwarding && | |
fbea49e1 | 833 | (ipv6_devconf.proxy_ndp || idev->cnf.proxy_ndp) && |
62dd9318 VN |
834 | (pneigh = pneigh_lookup(&nd_tbl, |
835 | &msg->target, dev, 0)) != NULL)) { | |
a61bbcf2 | 836 | if (!(NEIGH_CB(skb)->flags & LOCALLY_ENQUEUED) && |
1da177e4 LT |
837 | skb->pkt_type != PACKET_HOST && |
838 | inc != 0 && | |
839 | idev->nd_parms->proxy_delay != 0) { | |
840 | /* | |
841 | * for anycast or proxy, | |
842 | * sender should delay its response | |
843 | * by a random time between 0 and | |
844 | * MAX_ANYCAST_DELAY_TIME seconds. | |
845 | * (RFC2461) -- yoshfuji | |
846 | */ | |
847 | struct sk_buff *n = skb_clone(skb, GFP_ATOMIC); | |
848 | if (n) | |
849 | pneigh_enqueue(&nd_tbl, idev->nd_parms, n); | |
850 | goto out; | |
851 | } | |
852 | } else | |
853 | goto out; | |
854 | } | |
855 | ||
fc26d0ab | 856 | is_router = !!(pneigh ? pneigh->flags & NTF_ROUTER : idev->cnf.forwarding); |
62dd9318 | 857 | |
1da177e4 LT |
858 | if (dad) { |
859 | struct in6_addr maddr; | |
860 | ||
861 | ipv6_addr_all_nodes(&maddr); | |
862 | ndisc_send_na(dev, NULL, &maddr, &msg->target, | |
62dd9318 | 863 | is_router, 0, (ifp != NULL), 1); |
1da177e4 LT |
864 | goto out; |
865 | } | |
866 | ||
867 | if (inc) | |
868 | NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_mcast); | |
869 | else | |
870 | NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_ucast); | |
871 | ||
872 | /* | |
873 | * update / create cache entry | |
874 | * for the source address | |
875 | */ | |
876 | neigh = __neigh_lookup(&nd_tbl, saddr, dev, | |
877 | !inc || lladdr || !dev->addr_len); | |
878 | if (neigh) | |
879 | neigh_update(neigh, lladdr, NUD_STALE, | |
880 | NEIGH_UPDATE_F_WEAK_OVERRIDE| | |
881 | NEIGH_UPDATE_F_OVERRIDE); | |
882 | if (neigh || !dev->hard_header) { | |
883 | ndisc_send_na(dev, neigh, saddr, &msg->target, | |
62dd9318 | 884 | is_router, |
1da177e4 LT |
885 | 1, (ifp != NULL && inc), inc); |
886 | if (neigh) | |
887 | neigh_release(neigh); | |
888 | } | |
889 | ||
890 | out: | |
891 | if (ifp) | |
892 | in6_ifa_put(ifp); | |
893 | else | |
894 | in6_dev_put(idev); | |
895 | ||
896 | return; | |
897 | } | |
898 | ||
899 | static void ndisc_recv_na(struct sk_buff *skb) | |
900 | { | |
901 | struct nd_msg *msg = (struct nd_msg *)skb->h.raw; | |
902 | struct in6_addr *saddr = &skb->nh.ipv6h->saddr; | |
903 | struct in6_addr *daddr = &skb->nh.ipv6h->daddr; | |
904 | u8 *lladdr = NULL; | |
905 | u32 ndoptlen = skb->tail - msg->opt; | |
906 | struct ndisc_options ndopts; | |
907 | struct net_device *dev = skb->dev; | |
908 | struct inet6_ifaddr *ifp; | |
909 | struct neighbour *neigh; | |
910 | ||
911 | if (skb->len < sizeof(struct nd_msg)) { | |
912 | ND_PRINTK2(KERN_WARNING | |
913 | "ICMPv6 NA: packet too short\n"); | |
914 | return; | |
915 | } | |
916 | ||
917 | if (ipv6_addr_is_multicast(&msg->target)) { | |
918 | ND_PRINTK2(KERN_WARNING | |
919 | "ICMPv6 NA: target address is multicast.\n"); | |
920 | return; | |
921 | } | |
922 | ||
923 | if (ipv6_addr_is_multicast(daddr) && | |
924 | msg->icmph.icmp6_solicited) { | |
925 | ND_PRINTK2(KERN_WARNING | |
926 | "ICMPv6 NA: solicited NA is multicasted.\n"); | |
927 | return; | |
928 | } | |
929 | ||
930 | if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) { | |
931 | ND_PRINTK2(KERN_WARNING | |
932 | "ICMPv6 NS: invalid ND option\n"); | |
933 | return; | |
934 | } | |
935 | if (ndopts.nd_opts_tgt_lladdr) { | |
936 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, dev); | |
937 | if (!lladdr) { | |
938 | ND_PRINTK2(KERN_WARNING | |
939 | "ICMPv6 NA: invalid link-layer address length\n"); | |
940 | return; | |
941 | } | |
942 | } | |
943 | if ((ifp = ipv6_get_ifaddr(&msg->target, dev, 1))) { | |
944 | if (ifp->flags & IFA_F_TENTATIVE) { | |
945 | addrconf_dad_failure(ifp); | |
946 | return; | |
947 | } | |
948 | /* What should we make now? The advertisement | |
949 | is invalid, but ndisc specs say nothing | |
950 | about it. It could be misconfiguration, or | |
951 | an smart proxy agent tries to help us :-) | |
952 | */ | |
953 | ND_PRINTK1(KERN_WARNING | |
954 | "ICMPv6 NA: someone advertises our address on %s!\n", | |
955 | ifp->idev->dev->name); | |
956 | in6_ifa_put(ifp); | |
957 | return; | |
958 | } | |
959 | neigh = neigh_lookup(&nd_tbl, &msg->target, dev); | |
960 | ||
961 | if (neigh) { | |
962 | u8 old_flags = neigh->flags; | |
963 | ||
964 | if (neigh->nud_state & NUD_FAILED) | |
965 | goto out; | |
966 | ||
5f3e6e9e VN |
967 | /* |
968 | * Don't update the neighbor cache entry on a proxy NA from | |
969 | * ourselves because either the proxied node is off link or it | |
970 | * has already sent a NA to us. | |
971 | */ | |
972 | if (lladdr && !memcmp(lladdr, dev->dev_addr, dev->addr_len) && | |
fbea49e1 YH |
973 | ipv6_devconf.forwarding && ipv6_devconf.proxy_ndp && |
974 | pneigh_lookup(&nd_tbl, &msg->target, dev, 0)) { | |
975 | /* XXX: idev->cnf.prixy_ndp */ | |
5f3e6e9e | 976 | goto out; |
fbea49e1 | 977 | } |
5f3e6e9e | 978 | |
1da177e4 LT |
979 | neigh_update(neigh, lladdr, |
980 | msg->icmph.icmp6_solicited ? NUD_REACHABLE : NUD_STALE, | |
981 | NEIGH_UPDATE_F_WEAK_OVERRIDE| | |
982 | (msg->icmph.icmp6_override ? NEIGH_UPDATE_F_OVERRIDE : 0)| | |
983 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
984 | (msg->icmph.icmp6_router ? NEIGH_UPDATE_F_ISROUTER : 0)); | |
985 | ||
986 | if ((old_flags & ~neigh->flags) & NTF_ROUTER) { | |
987 | /* | |
988 | * Change: router to host | |
989 | */ | |
990 | struct rt6_info *rt; | |
991 | rt = rt6_get_dflt_router(saddr, dev); | |
992 | if (rt) | |
e0a1ad73 | 993 | ip6_del_rt(rt); |
1da177e4 LT |
994 | } |
995 | ||
996 | out: | |
997 | neigh_release(neigh); | |
998 | } | |
999 | } | |
1000 | ||
1001 | static void ndisc_recv_rs(struct sk_buff *skb) | |
1002 | { | |
1003 | struct rs_msg *rs_msg = (struct rs_msg *) skb->h.raw; | |
1004 | unsigned long ndoptlen = skb->len - sizeof(*rs_msg); | |
1005 | struct neighbour *neigh; | |
1006 | struct inet6_dev *idev; | |
1007 | struct in6_addr *saddr = &skb->nh.ipv6h->saddr; | |
1008 | struct ndisc_options ndopts; | |
1009 | u8 *lladdr = NULL; | |
1010 | ||
1011 | if (skb->len < sizeof(*rs_msg)) | |
1012 | return; | |
1013 | ||
1014 | idev = in6_dev_get(skb->dev); | |
1015 | if (!idev) { | |
1016 | if (net_ratelimit()) | |
1017 | ND_PRINTK1("ICMP6 RS: can't find in6 device\n"); | |
1018 | return; | |
1019 | } | |
1020 | ||
1021 | /* Don't accept RS if we're not in router mode */ | |
1022 | if (!idev->cnf.forwarding) | |
1023 | goto out; | |
1024 | ||
1025 | /* | |
1026 | * Don't update NCE if src = ::; | |
1027 | * this implies that the source node has no ip address assigned yet. | |
1028 | */ | |
1029 | if (ipv6_addr_any(saddr)) | |
1030 | goto out; | |
1031 | ||
1032 | /* Parse ND options */ | |
1033 | if (!ndisc_parse_options(rs_msg->opt, ndoptlen, &ndopts)) { | |
1034 | if (net_ratelimit()) | |
1035 | ND_PRINTK2("ICMP6 NS: invalid ND option, ignored\n"); | |
1036 | goto out; | |
1037 | } | |
1038 | ||
1039 | if (ndopts.nd_opts_src_lladdr) { | |
1040 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, | |
1041 | skb->dev); | |
1042 | if (!lladdr) | |
1043 | goto out; | |
1044 | } | |
1045 | ||
1046 | neigh = __neigh_lookup(&nd_tbl, saddr, skb->dev, 1); | |
1047 | if (neigh) { | |
1048 | neigh_update(neigh, lladdr, NUD_STALE, | |
1049 | NEIGH_UPDATE_F_WEAK_OVERRIDE| | |
1050 | NEIGH_UPDATE_F_OVERRIDE| | |
1051 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER); | |
1052 | neigh_release(neigh); | |
1053 | } | |
1054 | out: | |
1055 | in6_dev_put(idev); | |
1056 | } | |
1057 | ||
1058 | static void ndisc_router_discovery(struct sk_buff *skb) | |
1059 | { | |
1060 | struct ra_msg *ra_msg = (struct ra_msg *) skb->h.raw; | |
1061 | struct neighbour *neigh = NULL; | |
1062 | struct inet6_dev *in6_dev; | |
65f5c7c1 | 1063 | struct rt6_info *rt = NULL; |
1da177e4 LT |
1064 | int lifetime; |
1065 | struct ndisc_options ndopts; | |
1066 | int optlen; | |
ebacaaa0 | 1067 | unsigned int pref = 0; |
1da177e4 LT |
1068 | |
1069 | __u8 * opt = (__u8 *)(ra_msg + 1); | |
1070 | ||
1071 | optlen = (skb->tail - skb->h.raw) - sizeof(struct ra_msg); | |
1072 | ||
1073 | if (!(ipv6_addr_type(&skb->nh.ipv6h->saddr) & IPV6_ADDR_LINKLOCAL)) { | |
1074 | ND_PRINTK2(KERN_WARNING | |
1075 | "ICMPv6 RA: source address is not link-local.\n"); | |
1076 | return; | |
1077 | } | |
1078 | if (optlen < 0) { | |
1079 | ND_PRINTK2(KERN_WARNING | |
1080 | "ICMPv6 RA: packet too short\n"); | |
1081 | return; | |
1082 | } | |
1083 | ||
1084 | /* | |
1085 | * set the RA_RECV flag in the interface | |
1086 | */ | |
1087 | ||
1088 | in6_dev = in6_dev_get(skb->dev); | |
1089 | if (in6_dev == NULL) { | |
1090 | ND_PRINTK0(KERN_ERR | |
1091 | "ICMPv6 RA: can't find inet6 device for %s.\n", | |
1092 | skb->dev->name); | |
1093 | return; | |
1094 | } | |
1095 | if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_ra) { | |
1096 | in6_dev_put(in6_dev); | |
1097 | return; | |
1098 | } | |
1099 | ||
1100 | if (!ndisc_parse_options(opt, optlen, &ndopts)) { | |
1101 | in6_dev_put(in6_dev); | |
1102 | ND_PRINTK2(KERN_WARNING | |
1103 | "ICMP6 RA: invalid ND options\n"); | |
1104 | return; | |
1105 | } | |
1106 | ||
1107 | if (in6_dev->if_flags & IF_RS_SENT) { | |
1108 | /* | |
1109 | * flag that an RA was received after an RS was sent | |
1110 | * out on this interface. | |
1111 | */ | |
1112 | in6_dev->if_flags |= IF_RA_RCVD; | |
1113 | } | |
1114 | ||
1115 | /* | |
1116 | * Remember the managed/otherconf flags from most recently | |
1117 | * received RA message (RFC 2462) -- yoshfuji | |
1118 | */ | |
1119 | in6_dev->if_flags = (in6_dev->if_flags & ~(IF_RA_MANAGED | | |
1120 | IF_RA_OTHERCONF)) | | |
1121 | (ra_msg->icmph.icmp6_addrconf_managed ? | |
1122 | IF_RA_MANAGED : 0) | | |
1123 | (ra_msg->icmph.icmp6_addrconf_other ? | |
1124 | IF_RA_OTHERCONF : 0); | |
1125 | ||
65f5c7c1 YH |
1126 | if (!in6_dev->cnf.accept_ra_defrtr) |
1127 | goto skip_defrtr; | |
1128 | ||
1da177e4 LT |
1129 | lifetime = ntohs(ra_msg->icmph.icmp6_rt_lifetime); |
1130 | ||
ebacaaa0 YH |
1131 | #ifdef CONFIG_IPV6_ROUTER_PREF |
1132 | pref = ra_msg->icmph.icmp6_router_pref; | |
1133 | /* 10b is handled as if it were 00b (medium) */ | |
930d6ff2 YH |
1134 | if (pref == ICMPV6_ROUTER_PREF_INVALID || |
1135 | in6_dev->cnf.accept_ra_rtr_pref) | |
ebacaaa0 YH |
1136 | pref = ICMPV6_ROUTER_PREF_MEDIUM; |
1137 | #endif | |
1138 | ||
1da177e4 LT |
1139 | rt = rt6_get_dflt_router(&skb->nh.ipv6h->saddr, skb->dev); |
1140 | ||
1141 | if (rt) | |
1142 | neigh = rt->rt6i_nexthop; | |
1143 | ||
1144 | if (rt && lifetime == 0) { | |
1145 | neigh_clone(neigh); | |
e0a1ad73 | 1146 | ip6_del_rt(rt); |
1da177e4 LT |
1147 | rt = NULL; |
1148 | } | |
1149 | ||
1150 | if (rt == NULL && lifetime) { | |
1151 | ND_PRINTK3(KERN_DEBUG | |
1152 | "ICMPv6 RA: adding default router.\n"); | |
1153 | ||
ebacaaa0 | 1154 | rt = rt6_add_dflt_router(&skb->nh.ipv6h->saddr, skb->dev, pref); |
1da177e4 LT |
1155 | if (rt == NULL) { |
1156 | ND_PRINTK0(KERN_ERR | |
1157 | "ICMPv6 RA: %s() failed to add default route.\n", | |
1158 | __FUNCTION__); | |
1159 | in6_dev_put(in6_dev); | |
1160 | return; | |
1161 | } | |
1162 | ||
1163 | neigh = rt->rt6i_nexthop; | |
1164 | if (neigh == NULL) { | |
1165 | ND_PRINTK0(KERN_ERR | |
1166 | "ICMPv6 RA: %s() got default router without neighbour.\n", | |
1167 | __FUNCTION__); | |
1168 | dst_release(&rt->u.dst); | |
1169 | in6_dev_put(in6_dev); | |
1170 | return; | |
1171 | } | |
1172 | neigh->flags |= NTF_ROUTER; | |
ebacaaa0 YH |
1173 | } else if (rt) { |
1174 | rt->rt6i_flags |= (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); | |
1da177e4 LT |
1175 | } |
1176 | ||
1177 | if (rt) | |
1178 | rt->rt6i_expires = jiffies + (HZ * lifetime); | |
1179 | ||
1180 | if (ra_msg->icmph.icmp6_hop_limit) { | |
1181 | in6_dev->cnf.hop_limit = ra_msg->icmph.icmp6_hop_limit; | |
1182 | if (rt) | |
1183 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = ra_msg->icmph.icmp6_hop_limit; | |
1184 | } | |
1185 | ||
65f5c7c1 YH |
1186 | skip_defrtr: |
1187 | ||
1da177e4 LT |
1188 | /* |
1189 | * Update Reachable Time and Retrans Timer | |
1190 | */ | |
1191 | ||
1192 | if (in6_dev->nd_parms) { | |
1193 | unsigned long rtime = ntohl(ra_msg->retrans_timer); | |
1194 | ||
1195 | if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/HZ) { | |
1196 | rtime = (rtime*HZ)/1000; | |
1197 | if (rtime < HZ/10) | |
1198 | rtime = HZ/10; | |
1199 | in6_dev->nd_parms->retrans_time = rtime; | |
1200 | in6_dev->tstamp = jiffies; | |
1201 | inet6_ifinfo_notify(RTM_NEWLINK, in6_dev); | |
1202 | } | |
1203 | ||
1204 | rtime = ntohl(ra_msg->reachable_time); | |
1205 | if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/(3*HZ)) { | |
1206 | rtime = (rtime*HZ)/1000; | |
1207 | ||
1208 | if (rtime < HZ/10) | |
1209 | rtime = HZ/10; | |
1210 | ||
1211 | if (rtime != in6_dev->nd_parms->base_reachable_time) { | |
1212 | in6_dev->nd_parms->base_reachable_time = rtime; | |
1213 | in6_dev->nd_parms->gc_staletime = 3 * rtime; | |
1214 | in6_dev->nd_parms->reachable_time = neigh_rand_reach_time(rtime); | |
1215 | in6_dev->tstamp = jiffies; | |
1216 | inet6_ifinfo_notify(RTM_NEWLINK, in6_dev); | |
1217 | } | |
1218 | } | |
1219 | } | |
1220 | ||
1221 | /* | |
1222 | * Process options. | |
1223 | */ | |
1224 | ||
1225 | if (!neigh) | |
1226 | neigh = __neigh_lookup(&nd_tbl, &skb->nh.ipv6h->saddr, | |
1227 | skb->dev, 1); | |
1228 | if (neigh) { | |
1229 | u8 *lladdr = NULL; | |
1230 | if (ndopts.nd_opts_src_lladdr) { | |
1231 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, | |
1232 | skb->dev); | |
1233 | if (!lladdr) { | |
1234 | ND_PRINTK2(KERN_WARNING | |
1235 | "ICMPv6 RA: invalid link-layer address length\n"); | |
1236 | goto out; | |
1237 | } | |
1238 | } | |
1239 | neigh_update(neigh, lladdr, NUD_STALE, | |
1240 | NEIGH_UPDATE_F_WEAK_OVERRIDE| | |
1241 | NEIGH_UPDATE_F_OVERRIDE| | |
1242 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
1243 | NEIGH_UPDATE_F_ISROUTER); | |
1244 | } | |
1245 | ||
70ceb4f5 | 1246 | #ifdef CONFIG_IPV6_ROUTE_INFO |
09c884d4 | 1247 | if (in6_dev->cnf.accept_ra_rtr_pref && ndopts.nd_opts_ri) { |
70ceb4f5 YH |
1248 | struct nd_opt_hdr *p; |
1249 | for (p = ndopts.nd_opts_ri; | |
1250 | p; | |
1251 | p = ndisc_next_option(p, ndopts.nd_opts_ri_end)) { | |
09c884d4 YH |
1252 | if (((struct route_info *)p)->prefix_len > in6_dev->cnf.accept_ra_rt_info_max_plen) |
1253 | continue; | |
70ceb4f5 YH |
1254 | rt6_route_rcv(skb->dev, (u8*)p, (p->nd_opt_len) << 3, |
1255 | &skb->nh.ipv6h->saddr); | |
1256 | } | |
1257 | } | |
1258 | #endif | |
1259 | ||
c4fd30eb | 1260 | if (in6_dev->cnf.accept_ra_pinfo && ndopts.nd_opts_pi) { |
1da177e4 LT |
1261 | struct nd_opt_hdr *p; |
1262 | for (p = ndopts.nd_opts_pi; | |
1263 | p; | |
1264 | p = ndisc_next_option(p, ndopts.nd_opts_pi_end)) { | |
1265 | addrconf_prefix_rcv(skb->dev, (u8*)p, (p->nd_opt_len) << 3); | |
1266 | } | |
1267 | } | |
1268 | ||
1269 | if (ndopts.nd_opts_mtu) { | |
e69a4adc | 1270 | __be32 n; |
1da177e4 LT |
1271 | u32 mtu; |
1272 | ||
e69a4adc AV |
1273 | memcpy(&n, ((u8*)(ndopts.nd_opts_mtu+1))+2, sizeof(mtu)); |
1274 | mtu = ntohl(n); | |
1da177e4 LT |
1275 | |
1276 | if (mtu < IPV6_MIN_MTU || mtu > skb->dev->mtu) { | |
1277 | ND_PRINTK2(KERN_WARNING | |
1278 | "ICMPv6 RA: invalid mtu: %d\n", | |
1279 | mtu); | |
1280 | } else if (in6_dev->cnf.mtu6 != mtu) { | |
1281 | in6_dev->cnf.mtu6 = mtu; | |
1282 | ||
1283 | if (rt) | |
1284 | rt->u.dst.metrics[RTAX_MTU-1] = mtu; | |
1285 | ||
1286 | rt6_mtu_change(skb->dev, mtu); | |
1287 | } | |
1288 | } | |
1289 | ||
1290 | if (ndopts.nd_opts_tgt_lladdr || ndopts.nd_opts_rh) { | |
1291 | ND_PRINTK2(KERN_WARNING | |
1292 | "ICMPv6 RA: invalid RA options"); | |
1293 | } | |
1294 | out: | |
1295 | if (rt) | |
1296 | dst_release(&rt->u.dst); | |
1297 | else if (neigh) | |
1298 | neigh_release(neigh); | |
1299 | in6_dev_put(in6_dev); | |
1300 | } | |
1301 | ||
1302 | static void ndisc_redirect_rcv(struct sk_buff *skb) | |
1303 | { | |
1304 | struct inet6_dev *in6_dev; | |
1305 | struct icmp6hdr *icmph; | |
1306 | struct in6_addr *dest; | |
1307 | struct in6_addr *target; /* new first hop to destination */ | |
1308 | struct neighbour *neigh; | |
1309 | int on_link = 0; | |
1310 | struct ndisc_options ndopts; | |
1311 | int optlen; | |
1312 | u8 *lladdr = NULL; | |
1313 | ||
1314 | if (!(ipv6_addr_type(&skb->nh.ipv6h->saddr) & IPV6_ADDR_LINKLOCAL)) { | |
1315 | ND_PRINTK2(KERN_WARNING | |
1316 | "ICMPv6 Redirect: source address is not link-local.\n"); | |
1317 | return; | |
1318 | } | |
1319 | ||
1320 | optlen = skb->tail - skb->h.raw; | |
1321 | optlen -= sizeof(struct icmp6hdr) + 2 * sizeof(struct in6_addr); | |
1322 | ||
1323 | if (optlen < 0) { | |
1324 | ND_PRINTK2(KERN_WARNING | |
1325 | "ICMPv6 Redirect: packet too short\n"); | |
1326 | return; | |
1327 | } | |
1328 | ||
1329 | icmph = (struct icmp6hdr *) skb->h.raw; | |
1330 | target = (struct in6_addr *) (icmph + 1); | |
1331 | dest = target + 1; | |
1332 | ||
1333 | if (ipv6_addr_is_multicast(dest)) { | |
1334 | ND_PRINTK2(KERN_WARNING | |
1335 | "ICMPv6 Redirect: destination address is multicast.\n"); | |
1336 | return; | |
1337 | } | |
1338 | ||
1339 | if (ipv6_addr_equal(dest, target)) { | |
1340 | on_link = 1; | |
1341 | } else if (!(ipv6_addr_type(target) & IPV6_ADDR_LINKLOCAL)) { | |
1342 | ND_PRINTK2(KERN_WARNING | |
1343 | "ICMPv6 Redirect: target address is not link-local.\n"); | |
1344 | return; | |
1345 | } | |
1346 | ||
1347 | in6_dev = in6_dev_get(skb->dev); | |
1348 | if (!in6_dev) | |
1349 | return; | |
1350 | if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects) { | |
1351 | in6_dev_put(in6_dev); | |
1352 | return; | |
1353 | } | |
1354 | ||
1355 | /* RFC2461 8.1: | |
1356 | * The IP source address of the Redirect MUST be the same as the current | |
1357 | * first-hop router for the specified ICMP Destination Address. | |
1358 | */ | |
1359 | ||
1360 | if (!ndisc_parse_options((u8*)(dest + 1), optlen, &ndopts)) { | |
1361 | ND_PRINTK2(KERN_WARNING | |
1362 | "ICMPv6 Redirect: invalid ND options\n"); | |
1363 | in6_dev_put(in6_dev); | |
1364 | return; | |
1365 | } | |
1366 | if (ndopts.nd_opts_tgt_lladdr) { | |
1367 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, | |
1368 | skb->dev); | |
1369 | if (!lladdr) { | |
1370 | ND_PRINTK2(KERN_WARNING | |
1371 | "ICMPv6 Redirect: invalid link-layer address length\n"); | |
1372 | in6_dev_put(in6_dev); | |
1373 | return; | |
1374 | } | |
1375 | } | |
1376 | ||
1377 | neigh = __neigh_lookup(&nd_tbl, target, skb->dev, 1); | |
1378 | if (neigh) { | |
5e032e32 YH |
1379 | rt6_redirect(dest, &skb->nh.ipv6h->daddr, |
1380 | &skb->nh.ipv6h->saddr, neigh, lladdr, | |
1da177e4 LT |
1381 | on_link); |
1382 | neigh_release(neigh); | |
1383 | } | |
1384 | in6_dev_put(in6_dev); | |
1385 | } | |
1386 | ||
1387 | void ndisc_send_redirect(struct sk_buff *skb, struct neighbour *neigh, | |
1388 | struct in6_addr *target) | |
1389 | { | |
1390 | struct sock *sk = ndisc_socket->sk; | |
1391 | int len = sizeof(struct icmp6hdr) + 2 * sizeof(struct in6_addr); | |
1392 | struct sk_buff *buff; | |
1393 | struct icmp6hdr *icmph; | |
1394 | struct in6_addr saddr_buf; | |
1395 | struct in6_addr *addrp; | |
1396 | struct net_device *dev; | |
1397 | struct rt6_info *rt; | |
1398 | struct dst_entry *dst; | |
1399 | struct inet6_dev *idev; | |
1400 | struct flowi fl; | |
1401 | u8 *opt; | |
1402 | int rd_len; | |
1403 | int err; | |
1404 | int hlen; | |
1405 | u8 ha_buf[MAX_ADDR_LEN], *ha = NULL; | |
1406 | ||
1407 | dev = skb->dev; | |
1408 | ||
1409 | if (ipv6_get_lladdr(dev, &saddr_buf)) { | |
1410 | ND_PRINTK2(KERN_WARNING | |
1411 | "ICMPv6 Redirect: no link-local address on %s\n", | |
1412 | dev->name); | |
1413 | return; | |
1414 | } | |
1415 | ||
af184765 YH |
1416 | ndisc_flow_init(&fl, NDISC_REDIRECT, &saddr_buf, &skb->nh.ipv6h->saddr, |
1417 | dev->ifindex); | |
1da177e4 LT |
1418 | |
1419 | dst = ip6_route_output(NULL, &fl); | |
1420 | if (dst == NULL) | |
1421 | return; | |
1422 | ||
1423 | err = xfrm_lookup(&dst, &fl, NULL, 0); | |
e104411b | 1424 | if (err) |
1da177e4 | 1425 | return; |
1da177e4 LT |
1426 | |
1427 | rt = (struct rt6_info *) dst; | |
1428 | ||
1429 | if (rt->rt6i_flags & RTF_GATEWAY) { | |
1430 | ND_PRINTK2(KERN_WARNING | |
1431 | "ICMPv6 Redirect: destination is not a neighbour.\n"); | |
1432 | dst_release(dst); | |
1433 | return; | |
1434 | } | |
1435 | if (!xrlim_allow(dst, 1*HZ)) { | |
1436 | dst_release(dst); | |
1437 | return; | |
1438 | } | |
1439 | ||
1440 | if (dev->addr_len) { | |
1441 | read_lock_bh(&neigh->lock); | |
1442 | if (neigh->nud_state & NUD_VALID) { | |
1443 | memcpy(ha_buf, neigh->ha, dev->addr_len); | |
1444 | read_unlock_bh(&neigh->lock); | |
1445 | ha = ha_buf; | |
1446 | len += ndisc_opt_addr_space(dev); | |
1447 | } else | |
1448 | read_unlock_bh(&neigh->lock); | |
1449 | } | |
1450 | ||
1451 | rd_len = min_t(unsigned int, | |
1452 | IPV6_MIN_MTU-sizeof(struct ipv6hdr)-len, skb->len + 8); | |
1453 | rd_len &= ~0x7; | |
1454 | len += rd_len; | |
1455 | ||
d54a81d3 DM |
1456 | buff = sock_alloc_send_skb(sk, |
1457 | (MAX_HEADER + sizeof(struct ipv6hdr) + | |
1458 | len + LL_RESERVED_SPACE(dev)), | |
1da177e4 LT |
1459 | 1, &err); |
1460 | if (buff == NULL) { | |
1461 | ND_PRINTK0(KERN_ERR | |
1462 | "ICMPv6 Redirect: %s() failed to allocate an skb.\n", | |
1463 | __FUNCTION__); | |
1464 | dst_release(dst); | |
1465 | return; | |
1466 | } | |
1467 | ||
1468 | hlen = 0; | |
1469 | ||
1470 | skb_reserve(buff, LL_RESERVED_SPACE(dev)); | |
1471 | ip6_nd_hdr(sk, buff, dev, &saddr_buf, &skb->nh.ipv6h->saddr, | |
1472 | IPPROTO_ICMPV6, len); | |
1473 | ||
1474 | icmph = (struct icmp6hdr *)skb_put(buff, len); | |
1475 | buff->h.raw = (unsigned char*)icmph; | |
1476 | ||
1477 | memset(icmph, 0, sizeof(struct icmp6hdr)); | |
1478 | icmph->icmp6_type = NDISC_REDIRECT; | |
1479 | ||
1480 | /* | |
1481 | * copy target and destination addresses | |
1482 | */ | |
1483 | ||
1484 | addrp = (struct in6_addr *)(icmph + 1); | |
1485 | ipv6_addr_copy(addrp, target); | |
1486 | addrp++; | |
1487 | ipv6_addr_copy(addrp, &skb->nh.ipv6h->daddr); | |
1488 | ||
1489 | opt = (u8*) (addrp + 1); | |
1490 | ||
1491 | /* | |
1492 | * include target_address option | |
1493 | */ | |
1494 | ||
1495 | if (ha) | |
1496 | opt = ndisc_fill_addr_option(opt, ND_OPT_TARGET_LL_ADDR, ha, | |
1497 | dev->addr_len, dev->type); | |
1498 | ||
1499 | /* | |
1500 | * build redirect option and copy skb over to the new packet. | |
1501 | */ | |
1502 | ||
1503 | memset(opt, 0, 8); | |
1504 | *(opt++) = ND_OPT_REDIRECT_HDR; | |
1505 | *(opt++) = (rd_len >> 3); | |
1506 | opt += 6; | |
1507 | ||
1508 | memcpy(opt, skb->nh.ipv6h, rd_len - 8); | |
1509 | ||
1510 | icmph->icmp6_cksum = csum_ipv6_magic(&saddr_buf, &skb->nh.ipv6h->saddr, | |
1511 | len, IPPROTO_ICMPV6, | |
1512 | csum_partial((u8 *) icmph, len, 0)); | |
1513 | ||
1514 | buff->dst = dst; | |
1515 | idev = in6_dev_get(dst->dev); | |
a11d206d | 1516 | IP6_INC_STATS(idev, IPSTATS_MIB_OUTREQUESTS); |
1da177e4 LT |
1517 | err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, buff, NULL, dst->dev, dst_output); |
1518 | if (!err) { | |
1519 | ICMP6_INC_STATS(idev, ICMP6_MIB_OUTREDIRECTS); | |
1520 | ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS); | |
1521 | } | |
1522 | ||
1523 | if (likely(idev != NULL)) | |
1524 | in6_dev_put(idev); | |
1525 | } | |
1526 | ||
1527 | static void pndisc_redo(struct sk_buff *skb) | |
1528 | { | |
140e26fc | 1529 | ndisc_recv_ns(skb); |
1da177e4 LT |
1530 | kfree_skb(skb); |
1531 | } | |
1532 | ||
1533 | int ndisc_rcv(struct sk_buff *skb) | |
1534 | { | |
1535 | struct nd_msg *msg; | |
1536 | ||
1537 | if (!pskb_may_pull(skb, skb->len)) | |
1538 | return 0; | |
1539 | ||
1540 | msg = (struct nd_msg *) skb->h.raw; | |
1541 | ||
1542 | __skb_push(skb, skb->data-skb->h.raw); | |
1543 | ||
1544 | if (skb->nh.ipv6h->hop_limit != 255) { | |
1545 | ND_PRINTK2(KERN_WARNING | |
1546 | "ICMPv6 NDISC: invalid hop-limit: %d\n", | |
1547 | skb->nh.ipv6h->hop_limit); | |
1548 | return 0; | |
1549 | } | |
1550 | ||
1551 | if (msg->icmph.icmp6_code != 0) { | |
1552 | ND_PRINTK2(KERN_WARNING | |
1553 | "ICMPv6 NDISC: invalid ICMPv6 code: %d\n", | |
1554 | msg->icmph.icmp6_code); | |
1555 | return 0; | |
1556 | } | |
1557 | ||
a61bbcf2 PM |
1558 | memset(NEIGH_CB(skb), 0, sizeof(struct neighbour_cb)); |
1559 | ||
1da177e4 LT |
1560 | switch (msg->icmph.icmp6_type) { |
1561 | case NDISC_NEIGHBOUR_SOLICITATION: | |
1562 | ndisc_recv_ns(skb); | |
1563 | break; | |
1564 | ||
1565 | case NDISC_NEIGHBOUR_ADVERTISEMENT: | |
1566 | ndisc_recv_na(skb); | |
1567 | break; | |
1568 | ||
1569 | case NDISC_ROUTER_SOLICITATION: | |
1570 | ndisc_recv_rs(skb); | |
1571 | break; | |
1572 | ||
1573 | case NDISC_ROUTER_ADVERTISEMENT: | |
1574 | ndisc_router_discovery(skb); | |
1575 | break; | |
1576 | ||
1577 | case NDISC_REDIRECT: | |
1578 | ndisc_redirect_rcv(skb); | |
1579 | break; | |
1580 | }; | |
1581 | ||
1582 | return 0; | |
1583 | } | |
1584 | ||
1585 | static int ndisc_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1586 | { | |
1587 | struct net_device *dev = ptr; | |
1588 | ||
1589 | switch (event) { | |
1590 | case NETDEV_CHANGEADDR: | |
1591 | neigh_changeaddr(&nd_tbl, dev); | |
1592 | fib6_run_gc(~0UL); | |
1593 | break; | |
1594 | case NETDEV_DOWN: | |
1595 | neigh_ifdown(&nd_tbl, dev); | |
1596 | fib6_run_gc(~0UL); | |
1597 | break; | |
1598 | default: | |
1599 | break; | |
1600 | } | |
1601 | ||
1602 | return NOTIFY_DONE; | |
1603 | } | |
1604 | ||
1605 | static struct notifier_block ndisc_netdev_notifier = { | |
1606 | .notifier_call = ndisc_netdev_event, | |
1607 | }; | |
1608 | ||
1609 | #ifdef CONFIG_SYSCTL | |
1610 | static void ndisc_warn_deprecated_sysctl(struct ctl_table *ctl, | |
1611 | const char *func, const char *dev_name) | |
1612 | { | |
1613 | static char warncomm[TASK_COMM_LEN]; | |
1614 | static int warned; | |
1615 | if (strcmp(warncomm, current->comm) && warned < 5) { | |
1616 | strcpy(warncomm, current->comm); | |
1617 | printk(KERN_WARNING | |
1618 | "process `%s' is using deprecated sysctl (%s) " | |
1619 | "net.ipv6.neigh.%s.%s; " | |
1620 | "Use net.ipv6.neigh.%s.%s_ms " | |
1621 | "instead.\n", | |
1622 | warncomm, func, | |
1623 | dev_name, ctl->procname, | |
1624 | dev_name, ctl->procname); | |
1625 | warned++; | |
1626 | } | |
1627 | } | |
1628 | ||
1629 | int ndisc_ifinfo_sysctl_change(struct ctl_table *ctl, int write, struct file * filp, void __user *buffer, size_t *lenp, loff_t *ppos) | |
1630 | { | |
1631 | struct net_device *dev = ctl->extra1; | |
1632 | struct inet6_dev *idev; | |
1633 | int ret; | |
1634 | ||
1635 | if (ctl->ctl_name == NET_NEIGH_RETRANS_TIME || | |
1636 | ctl->ctl_name == NET_NEIGH_REACHABLE_TIME) | |
1637 | ndisc_warn_deprecated_sysctl(ctl, "syscall", dev ? dev->name : "default"); | |
1638 | ||
1639 | switch (ctl->ctl_name) { | |
1640 | case NET_NEIGH_RETRANS_TIME: | |
1641 | ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos); | |
1642 | break; | |
1643 | case NET_NEIGH_REACHABLE_TIME: | |
1644 | ret = proc_dointvec_jiffies(ctl, write, | |
1645 | filp, buffer, lenp, ppos); | |
1646 | break; | |
1647 | case NET_NEIGH_RETRANS_TIME_MS: | |
1648 | case NET_NEIGH_REACHABLE_TIME_MS: | |
1649 | ret = proc_dointvec_ms_jiffies(ctl, write, | |
1650 | filp, buffer, lenp, ppos); | |
1651 | break; | |
1652 | default: | |
1653 | ret = -1; | |
1654 | } | |
1655 | ||
1656 | if (write && ret == 0 && dev && (idev = in6_dev_get(dev)) != NULL) { | |
1657 | if (ctl->ctl_name == NET_NEIGH_REACHABLE_TIME || | |
1658 | ctl->ctl_name == NET_NEIGH_REACHABLE_TIME_MS) | |
1659 | idev->nd_parms->reachable_time = neigh_rand_reach_time(idev->nd_parms->base_reachable_time); | |
1660 | idev->tstamp = jiffies; | |
1661 | inet6_ifinfo_notify(RTM_NEWLINK, idev); | |
1662 | in6_dev_put(idev); | |
1663 | } | |
1664 | return ret; | |
1665 | } | |
1666 | ||
1667 | static int ndisc_ifinfo_sysctl_strategy(ctl_table *ctl, int __user *name, | |
1668 | int nlen, void __user *oldval, | |
1669 | size_t __user *oldlenp, | |
1670 | void __user *newval, size_t newlen, | |
1671 | void **context) | |
1672 | { | |
1673 | struct net_device *dev = ctl->extra1; | |
1674 | struct inet6_dev *idev; | |
1675 | int ret; | |
1676 | ||
1677 | if (ctl->ctl_name == NET_NEIGH_RETRANS_TIME || | |
1678 | ctl->ctl_name == NET_NEIGH_REACHABLE_TIME) | |
1679 | ndisc_warn_deprecated_sysctl(ctl, "procfs", dev ? dev->name : "default"); | |
1680 | ||
1681 | switch (ctl->ctl_name) { | |
1682 | case NET_NEIGH_REACHABLE_TIME: | |
1683 | ret = sysctl_jiffies(ctl, name, nlen, | |
1684 | oldval, oldlenp, newval, newlen, | |
1685 | context); | |
1686 | break; | |
1687 | case NET_NEIGH_RETRANS_TIME_MS: | |
1688 | case NET_NEIGH_REACHABLE_TIME_MS: | |
1689 | ret = sysctl_ms_jiffies(ctl, name, nlen, | |
1690 | oldval, oldlenp, newval, newlen, | |
1691 | context); | |
1692 | break; | |
1693 | default: | |
1694 | ret = 0; | |
1695 | } | |
1696 | ||
1697 | if (newval && newlen && ret > 0 && | |
1698 | dev && (idev = in6_dev_get(dev)) != NULL) { | |
1699 | if (ctl->ctl_name == NET_NEIGH_REACHABLE_TIME || | |
1700 | ctl->ctl_name == NET_NEIGH_REACHABLE_TIME_MS) | |
1701 | idev->nd_parms->reachable_time = neigh_rand_reach_time(idev->nd_parms->base_reachable_time); | |
1702 | idev->tstamp = jiffies; | |
1703 | inet6_ifinfo_notify(RTM_NEWLINK, idev); | |
1704 | in6_dev_put(idev); | |
1705 | } | |
1706 | ||
1707 | return ret; | |
1708 | } | |
1709 | ||
1710 | #endif | |
1711 | ||
1712 | int __init ndisc_init(struct net_proto_family *ops) | |
1713 | { | |
1714 | struct ipv6_pinfo *np; | |
1715 | struct sock *sk; | |
1716 | int err; | |
1717 | ||
1718 | err = sock_create_kern(PF_INET6, SOCK_RAW, IPPROTO_ICMPV6, &ndisc_socket); | |
1719 | if (err < 0) { | |
1720 | ND_PRINTK0(KERN_ERR | |
1721 | "ICMPv6 NDISC: Failed to initialize the control socket (err %d).\n", | |
1722 | err); | |
1723 | ndisc_socket = NULL; /* For safety. */ | |
1724 | return err; | |
1725 | } | |
1726 | ||
1727 | sk = ndisc_socket->sk; | |
1728 | np = inet6_sk(sk); | |
1729 | sk->sk_allocation = GFP_ATOMIC; | |
1730 | np->hop_limit = 255; | |
1731 | /* Do not loopback ndisc messages */ | |
1732 | np->mc_loop = 0; | |
1733 | sk->sk_prot->unhash(sk); | |
1734 | ||
1735 | /* | |
1736 | * Initialize the neighbour table | |
1737 | */ | |
1738 | ||
1739 | neigh_table_init(&nd_tbl); | |
1740 | ||
1741 | #ifdef CONFIG_SYSCTL | |
1742 | neigh_sysctl_register(NULL, &nd_tbl.parms, NET_IPV6, NET_IPV6_NEIGH, | |
1743 | "ipv6", | |
1744 | &ndisc_ifinfo_sysctl_change, | |
1745 | &ndisc_ifinfo_sysctl_strategy); | |
1746 | #endif | |
1747 | ||
1748 | register_netdevice_notifier(&ndisc_netdev_notifier); | |
1749 | return 0; | |
1750 | } | |
1751 | ||
1752 | void ndisc_cleanup(void) | |
1753 | { | |
36f73d0c | 1754 | unregister_netdevice_notifier(&ndisc_netdev_notifier); |
1da177e4 LT |
1755 | #ifdef CONFIG_SYSCTL |
1756 | neigh_sysctl_unregister(&nd_tbl.parms); | |
1757 | #endif | |
1758 | neigh_table_clear(&nd_tbl); | |
1759 | sock_release(ndisc_socket); | |
1760 | ndisc_socket = NULL; /* For safety. */ | |
1761 | } |