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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> | |
51 | #include <linux/config.h> | |
52 | #include <linux/errno.h> | |
53 | #include <linux/types.h> | |
54 | #include <linux/socket.h> | |
55 | #include <linux/sockios.h> | |
56 | #include <linux/sched.h> | |
57 | #include <linux/net.h> | |
58 | #include <linux/in6.h> | |
59 | #include <linux/route.h> | |
60 | #include <linux/init.h> | |
61 | #include <linux/rcupdate.h> | |
62 | #ifdef CONFIG_SYSCTL | |
63 | #include <linux/sysctl.h> | |
64 | #endif | |
65 | ||
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, | |
415 | struct in6_addr *saddr, struct in6_addr *daddr) | |
416 | { | |
417 | memset(fl, 0, sizeof(*fl)); | |
418 | ipv6_addr_copy(&fl->fl6_src, saddr); | |
419 | ipv6_addr_copy(&fl->fl6_dst, daddr); | |
420 | fl->proto = IPPROTO_ICMPV6; | |
421 | fl->fl_icmp_type = type; | |
422 | fl->fl_icmp_code = 0; | |
423 | } | |
424 | ||
425 | static void ndisc_send_na(struct net_device *dev, struct neighbour *neigh, | |
426 | struct in6_addr *daddr, struct in6_addr *solicited_addr, | |
427 | int router, int solicited, int override, int inc_opt) | |
428 | { | |
429 | struct in6_addr tmpaddr; | |
430 | struct inet6_ifaddr *ifp; | |
431 | struct inet6_dev *idev; | |
432 | struct flowi fl; | |
433 | struct dst_entry* dst; | |
434 | struct sock *sk = ndisc_socket->sk; | |
435 | struct in6_addr *src_addr; | |
436 | struct nd_msg *msg; | |
437 | int len; | |
438 | struct sk_buff *skb; | |
439 | int err; | |
440 | ||
441 | len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr); | |
442 | ||
443 | /* for anycast or proxy, solicited_addr != src_addr */ | |
444 | ifp = ipv6_get_ifaddr(solicited_addr, dev, 1); | |
445 | if (ifp) { | |
446 | src_addr = solicited_addr; | |
447 | in6_ifa_put(ifp); | |
448 | } else { | |
449 | if (ipv6_dev_get_saddr(dev, daddr, &tmpaddr)) | |
450 | return; | |
451 | src_addr = &tmpaddr; | |
452 | } | |
453 | ||
454 | ndisc_flow_init(&fl, NDISC_NEIGHBOUR_ADVERTISEMENT, src_addr, daddr); | |
455 | ||
456 | dst = ndisc_dst_alloc(dev, neigh, daddr, ip6_output); | |
457 | if (!dst) | |
458 | return; | |
459 | ||
460 | err = xfrm_lookup(&dst, &fl, NULL, 0); | |
e104411b | 461 | if (err < 0) |
1da177e4 | 462 | return; |
1da177e4 LT |
463 | |
464 | if (inc_opt) { | |
465 | if (dev->addr_len) | |
466 | len += ndisc_opt_addr_space(dev); | |
467 | else | |
468 | inc_opt = 0; | |
469 | } | |
470 | ||
471 | skb = sock_alloc_send_skb(sk, MAX_HEADER + len + LL_RESERVED_SPACE(dev), | |
472 | 1, &err); | |
473 | ||
474 | if (skb == NULL) { | |
475 | ND_PRINTK0(KERN_ERR | |
476 | "ICMPv6 NA: %s() failed to allocate an skb.\n", | |
477 | __FUNCTION__); | |
478 | dst_release(dst); | |
479 | return; | |
480 | } | |
481 | ||
482 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); | |
483 | ip6_nd_hdr(sk, skb, dev, src_addr, daddr, IPPROTO_ICMPV6, len); | |
484 | ||
485 | msg = (struct nd_msg *)skb_put(skb, len); | |
486 | skb->h.raw = (unsigned char*)msg; | |
487 | ||
488 | msg->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT; | |
489 | msg->icmph.icmp6_code = 0; | |
490 | msg->icmph.icmp6_cksum = 0; | |
491 | ||
492 | msg->icmph.icmp6_unused = 0; | |
493 | msg->icmph.icmp6_router = router; | |
494 | msg->icmph.icmp6_solicited = solicited; | |
495 | msg->icmph.icmp6_override = !!override; | |
496 | ||
497 | /* Set the target address. */ | |
498 | ipv6_addr_copy(&msg->target, solicited_addr); | |
499 | ||
500 | if (inc_opt) | |
501 | ndisc_fill_addr_option(msg->opt, ND_OPT_TARGET_LL_ADDR, dev->dev_addr, | |
502 | dev->addr_len, dev->type); | |
503 | ||
504 | /* checksum */ | |
505 | msg->icmph.icmp6_cksum = csum_ipv6_magic(src_addr, daddr, len, | |
506 | IPPROTO_ICMPV6, | |
507 | csum_partial((__u8 *) msg, | |
508 | len, 0)); | |
509 | ||
510 | skb->dst = dst; | |
511 | idev = in6_dev_get(dst->dev); | |
512 | IP6_INC_STATS(IPSTATS_MIB_OUTREQUESTS); | |
513 | err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, dst->dev, dst_output); | |
514 | if (!err) { | |
515 | ICMP6_INC_STATS(idev, ICMP6_MIB_OUTNEIGHBORADVERTISEMENTS); | |
516 | ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS); | |
517 | } | |
518 | ||
519 | if (likely(idev != NULL)) | |
520 | in6_dev_put(idev); | |
521 | } | |
522 | ||
523 | void ndisc_send_ns(struct net_device *dev, struct neighbour *neigh, | |
524 | struct in6_addr *solicit, | |
525 | struct in6_addr *daddr, struct in6_addr *saddr) | |
526 | { | |
527 | struct flowi fl; | |
528 | struct dst_entry* dst; | |
529 | struct inet6_dev *idev; | |
530 | struct sock *sk = ndisc_socket->sk; | |
531 | struct sk_buff *skb; | |
532 | struct nd_msg *msg; | |
533 | struct in6_addr addr_buf; | |
534 | int len; | |
535 | int err; | |
536 | int send_llinfo; | |
537 | ||
538 | if (saddr == NULL) { | |
539 | if (ipv6_get_lladdr(dev, &addr_buf)) | |
540 | return; | |
541 | saddr = &addr_buf; | |
542 | } | |
543 | ||
544 | ndisc_flow_init(&fl, NDISC_NEIGHBOUR_SOLICITATION, saddr, daddr); | |
545 | ||
546 | dst = ndisc_dst_alloc(dev, neigh, daddr, ip6_output); | |
547 | if (!dst) | |
548 | return; | |
549 | ||
550 | err = xfrm_lookup(&dst, &fl, NULL, 0); | |
e104411b | 551 | if (err < 0) |
1da177e4 | 552 | return; |
1da177e4 LT |
553 | |
554 | len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr); | |
555 | send_llinfo = dev->addr_len && !ipv6_addr_any(saddr); | |
556 | if (send_llinfo) | |
557 | len += ndisc_opt_addr_space(dev); | |
558 | ||
559 | skb = sock_alloc_send_skb(sk, MAX_HEADER + len + LL_RESERVED_SPACE(dev), | |
560 | 1, &err); | |
561 | if (skb == NULL) { | |
562 | ND_PRINTK0(KERN_ERR | |
563 | "ICMPv6 NA: %s() failed to allocate an skb.\n", | |
564 | __FUNCTION__); | |
565 | dst_release(dst); | |
566 | return; | |
567 | } | |
568 | ||
569 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); | |
570 | ip6_nd_hdr(sk, skb, dev, saddr, daddr, IPPROTO_ICMPV6, len); | |
571 | ||
572 | msg = (struct nd_msg *)skb_put(skb, len); | |
573 | skb->h.raw = (unsigned char*)msg; | |
574 | msg->icmph.icmp6_type = NDISC_NEIGHBOUR_SOLICITATION; | |
575 | msg->icmph.icmp6_code = 0; | |
576 | msg->icmph.icmp6_cksum = 0; | |
577 | msg->icmph.icmp6_unused = 0; | |
578 | ||
579 | /* Set the target address. */ | |
580 | ipv6_addr_copy(&msg->target, solicit); | |
581 | ||
582 | if (send_llinfo) | |
583 | ndisc_fill_addr_option(msg->opt, ND_OPT_SOURCE_LL_ADDR, dev->dev_addr, | |
584 | dev->addr_len, dev->type); | |
585 | ||
586 | /* checksum */ | |
587 | msg->icmph.icmp6_cksum = csum_ipv6_magic(&skb->nh.ipv6h->saddr, | |
588 | daddr, len, | |
589 | IPPROTO_ICMPV6, | |
590 | csum_partial((__u8 *) msg, | |
591 | len, 0)); | |
592 | /* send it! */ | |
593 | skb->dst = dst; | |
594 | idev = in6_dev_get(dst->dev); | |
595 | IP6_INC_STATS(IPSTATS_MIB_OUTREQUESTS); | |
596 | err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, dst->dev, dst_output); | |
597 | if (!err) { | |
598 | ICMP6_INC_STATS(idev, ICMP6_MIB_OUTNEIGHBORSOLICITS); | |
599 | ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS); | |
600 | } | |
601 | ||
602 | if (likely(idev != NULL)) | |
603 | in6_dev_put(idev); | |
604 | } | |
605 | ||
606 | void ndisc_send_rs(struct net_device *dev, struct in6_addr *saddr, | |
607 | struct in6_addr *daddr) | |
608 | { | |
609 | struct flowi fl; | |
610 | struct dst_entry* dst; | |
611 | struct inet6_dev *idev; | |
612 | struct sock *sk = ndisc_socket->sk; | |
613 | struct sk_buff *skb; | |
614 | struct icmp6hdr *hdr; | |
615 | __u8 * opt; | |
616 | int len; | |
617 | int err; | |
618 | ||
619 | ndisc_flow_init(&fl, NDISC_ROUTER_SOLICITATION, saddr, daddr); | |
620 | ||
621 | dst = ndisc_dst_alloc(dev, NULL, daddr, ip6_output); | |
622 | if (!dst) | |
623 | return; | |
624 | ||
625 | err = xfrm_lookup(&dst, &fl, NULL, 0); | |
e104411b | 626 | if (err < 0) |
1da177e4 | 627 | return; |
1da177e4 LT |
628 | |
629 | len = sizeof(struct icmp6hdr); | |
630 | if (dev->addr_len) | |
631 | len += ndisc_opt_addr_space(dev); | |
632 | ||
633 | skb = sock_alloc_send_skb(sk, MAX_HEADER + len + LL_RESERVED_SPACE(dev), | |
634 | 1, &err); | |
635 | if (skb == NULL) { | |
636 | ND_PRINTK0(KERN_ERR | |
637 | "ICMPv6 RS: %s() failed to allocate an skb.\n", | |
638 | __FUNCTION__); | |
639 | dst_release(dst); | |
640 | return; | |
641 | } | |
642 | ||
643 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); | |
644 | ip6_nd_hdr(sk, skb, dev, saddr, daddr, IPPROTO_ICMPV6, len); | |
645 | ||
646 | hdr = (struct icmp6hdr *)skb_put(skb, len); | |
647 | skb->h.raw = (unsigned char*)hdr; | |
648 | hdr->icmp6_type = NDISC_ROUTER_SOLICITATION; | |
649 | hdr->icmp6_code = 0; | |
650 | hdr->icmp6_cksum = 0; | |
651 | hdr->icmp6_unused = 0; | |
652 | ||
653 | opt = (u8*) (hdr + 1); | |
654 | ||
655 | if (dev->addr_len) | |
656 | ndisc_fill_addr_option(opt, ND_OPT_SOURCE_LL_ADDR, dev->dev_addr, | |
657 | dev->addr_len, dev->type); | |
658 | ||
659 | /* checksum */ | |
660 | hdr->icmp6_cksum = csum_ipv6_magic(&skb->nh.ipv6h->saddr, daddr, len, | |
661 | IPPROTO_ICMPV6, | |
662 | csum_partial((__u8 *) hdr, len, 0)); | |
663 | ||
664 | /* send it! */ | |
665 | skb->dst = dst; | |
666 | idev = in6_dev_get(dst->dev); | |
667 | IP6_INC_STATS(IPSTATS_MIB_OUTREQUESTS); | |
668 | err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, dst->dev, dst_output); | |
669 | if (!err) { | |
670 | ICMP6_INC_STATS(idev, ICMP6_MIB_OUTROUTERSOLICITS); | |
671 | ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS); | |
672 | } | |
673 | ||
674 | if (likely(idev != NULL)) | |
675 | in6_dev_put(idev); | |
676 | } | |
677 | ||
678 | ||
679 | static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb) | |
680 | { | |
681 | /* | |
682 | * "The sender MUST return an ICMP | |
683 | * destination unreachable" | |
684 | */ | |
685 | dst_link_failure(skb); | |
686 | kfree_skb(skb); | |
687 | } | |
688 | ||
689 | /* Called with locked neigh: either read or both */ | |
690 | ||
691 | static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb) | |
692 | { | |
693 | struct in6_addr *saddr = NULL; | |
694 | struct in6_addr mcaddr; | |
695 | struct net_device *dev = neigh->dev; | |
696 | struct in6_addr *target = (struct in6_addr *)&neigh->primary_key; | |
697 | int probes = atomic_read(&neigh->probes); | |
698 | ||
699 | if (skb && ipv6_chk_addr(&skb->nh.ipv6h->saddr, dev, 1)) | |
700 | saddr = &skb->nh.ipv6h->saddr; | |
701 | ||
702 | if ((probes -= neigh->parms->ucast_probes) < 0) { | |
703 | if (!(neigh->nud_state & NUD_VALID)) { | |
704 | ND_PRINTK1(KERN_DEBUG | |
705 | "%s(): trying to ucast probe in NUD_INVALID: " | |
46b86a2d | 706 | NIP6_FMT "\n", |
1da177e4 LT |
707 | __FUNCTION__, |
708 | NIP6(*target)); | |
709 | } | |
710 | ndisc_send_ns(dev, neigh, target, target, saddr); | |
711 | } else if ((probes -= neigh->parms->app_probes) < 0) { | |
712 | #ifdef CONFIG_ARPD | |
713 | neigh_app_ns(neigh); | |
714 | #endif | |
715 | } else { | |
716 | addrconf_addr_solict_mult(target, &mcaddr); | |
717 | ndisc_send_ns(dev, NULL, target, &mcaddr, saddr); | |
718 | } | |
719 | } | |
720 | ||
721 | static void ndisc_recv_ns(struct sk_buff *skb) | |
722 | { | |
723 | struct nd_msg *msg = (struct nd_msg *)skb->h.raw; | |
724 | struct in6_addr *saddr = &skb->nh.ipv6h->saddr; | |
725 | struct in6_addr *daddr = &skb->nh.ipv6h->daddr; | |
726 | u8 *lladdr = NULL; | |
727 | u32 ndoptlen = skb->tail - msg->opt; | |
728 | struct ndisc_options ndopts; | |
729 | struct net_device *dev = skb->dev; | |
730 | struct inet6_ifaddr *ifp; | |
731 | struct inet6_dev *idev = NULL; | |
732 | struct neighbour *neigh; | |
733 | int dad = ipv6_addr_any(saddr); | |
734 | int inc; | |
735 | ||
736 | if (ipv6_addr_is_multicast(&msg->target)) { | |
737 | ND_PRINTK2(KERN_WARNING | |
738 | "ICMPv6 NS: multicast target address"); | |
739 | return; | |
740 | } | |
741 | ||
742 | /* | |
743 | * RFC2461 7.1.1: | |
744 | * DAD has to be destined for solicited node multicast address. | |
745 | */ | |
746 | if (dad && | |
747 | !(daddr->s6_addr32[0] == htonl(0xff020000) && | |
748 | daddr->s6_addr32[1] == htonl(0x00000000) && | |
749 | daddr->s6_addr32[2] == htonl(0x00000001) && | |
750 | daddr->s6_addr [12] == 0xff )) { | |
751 | ND_PRINTK2(KERN_WARNING | |
752 | "ICMPv6 NS: bad DAD packet (wrong destination)\n"); | |
753 | return; | |
754 | } | |
755 | ||
756 | if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) { | |
757 | ND_PRINTK2(KERN_WARNING | |
758 | "ICMPv6 NS: invalid ND options\n"); | |
759 | return; | |
760 | } | |
761 | ||
762 | if (ndopts.nd_opts_src_lladdr) { | |
763 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, dev); | |
764 | if (!lladdr) { | |
765 | ND_PRINTK2(KERN_WARNING | |
766 | "ICMPv6 NS: invalid link-layer address length\n"); | |
767 | return; | |
768 | } | |
769 | ||
770 | /* RFC2461 7.1.1: | |
771 | * If the IP source address is the unspecified address, | |
772 | * there MUST NOT be source link-layer address option | |
773 | * in the message. | |
774 | */ | |
775 | if (dad) { | |
776 | ND_PRINTK2(KERN_WARNING | |
777 | "ICMPv6 NS: bad DAD packet (link-layer address option)\n"); | |
778 | return; | |
779 | } | |
780 | } | |
781 | ||
782 | inc = ipv6_addr_is_multicast(daddr); | |
783 | ||
784 | if ((ifp = ipv6_get_ifaddr(&msg->target, dev, 1)) != NULL) { | |
785 | if (ifp->flags & IFA_F_TENTATIVE) { | |
786 | /* Address is tentative. If the source | |
787 | is unspecified address, it is someone | |
788 | does DAD, otherwise we ignore solicitations | |
789 | until DAD timer expires. | |
790 | */ | |
791 | if (!dad) | |
792 | goto out; | |
793 | if (dev->type == ARPHRD_IEEE802_TR) { | |
794 | unsigned char *sadr = skb->mac.raw; | |
795 | if (((sadr[8] ^ dev->dev_addr[0]) & 0x7f) == 0 && | |
796 | sadr[9] == dev->dev_addr[1] && | |
797 | sadr[10] == dev->dev_addr[2] && | |
798 | sadr[11] == dev->dev_addr[3] && | |
799 | sadr[12] == dev->dev_addr[4] && | |
800 | sadr[13] == dev->dev_addr[5]) { | |
801 | /* looped-back to us */ | |
802 | goto out; | |
803 | } | |
804 | } | |
805 | addrconf_dad_failure(ifp); | |
806 | return; | |
807 | } | |
808 | ||
809 | idev = ifp->idev; | |
810 | } else { | |
811 | idev = in6_dev_get(dev); | |
812 | if (!idev) { | |
813 | /* XXX: count this drop? */ | |
814 | return; | |
815 | } | |
816 | ||
817 | if (ipv6_chk_acast_addr(dev, &msg->target) || | |
818 | (idev->cnf.forwarding && | |
819 | pneigh_lookup(&nd_tbl, &msg->target, dev, 0))) { | |
a61bbcf2 | 820 | if (!(NEIGH_CB(skb)->flags & LOCALLY_ENQUEUED) && |
1da177e4 LT |
821 | skb->pkt_type != PACKET_HOST && |
822 | inc != 0 && | |
823 | idev->nd_parms->proxy_delay != 0) { | |
824 | /* | |
825 | * for anycast or proxy, | |
826 | * sender should delay its response | |
827 | * by a random time between 0 and | |
828 | * MAX_ANYCAST_DELAY_TIME seconds. | |
829 | * (RFC2461) -- yoshfuji | |
830 | */ | |
831 | struct sk_buff *n = skb_clone(skb, GFP_ATOMIC); | |
832 | if (n) | |
833 | pneigh_enqueue(&nd_tbl, idev->nd_parms, n); | |
834 | goto out; | |
835 | } | |
836 | } else | |
837 | goto out; | |
838 | } | |
839 | ||
840 | if (dad) { | |
841 | struct in6_addr maddr; | |
842 | ||
843 | ipv6_addr_all_nodes(&maddr); | |
844 | ndisc_send_na(dev, NULL, &maddr, &msg->target, | |
845 | idev->cnf.forwarding, 0, (ifp != NULL), 1); | |
846 | goto out; | |
847 | } | |
848 | ||
849 | if (inc) | |
850 | NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_mcast); | |
851 | else | |
852 | NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_ucast); | |
853 | ||
854 | /* | |
855 | * update / create cache entry | |
856 | * for the source address | |
857 | */ | |
858 | neigh = __neigh_lookup(&nd_tbl, saddr, dev, | |
859 | !inc || lladdr || !dev->addr_len); | |
860 | if (neigh) | |
861 | neigh_update(neigh, lladdr, NUD_STALE, | |
862 | NEIGH_UPDATE_F_WEAK_OVERRIDE| | |
863 | NEIGH_UPDATE_F_OVERRIDE); | |
864 | if (neigh || !dev->hard_header) { | |
865 | ndisc_send_na(dev, neigh, saddr, &msg->target, | |
866 | idev->cnf.forwarding, | |
867 | 1, (ifp != NULL && inc), inc); | |
868 | if (neigh) | |
869 | neigh_release(neigh); | |
870 | } | |
871 | ||
872 | out: | |
873 | if (ifp) | |
874 | in6_ifa_put(ifp); | |
875 | else | |
876 | in6_dev_put(idev); | |
877 | ||
878 | return; | |
879 | } | |
880 | ||
881 | static void ndisc_recv_na(struct sk_buff *skb) | |
882 | { | |
883 | struct nd_msg *msg = (struct nd_msg *)skb->h.raw; | |
884 | struct in6_addr *saddr = &skb->nh.ipv6h->saddr; | |
885 | struct in6_addr *daddr = &skb->nh.ipv6h->daddr; | |
886 | u8 *lladdr = NULL; | |
887 | u32 ndoptlen = skb->tail - msg->opt; | |
888 | struct ndisc_options ndopts; | |
889 | struct net_device *dev = skb->dev; | |
890 | struct inet6_ifaddr *ifp; | |
891 | struct neighbour *neigh; | |
892 | ||
893 | if (skb->len < sizeof(struct nd_msg)) { | |
894 | ND_PRINTK2(KERN_WARNING | |
895 | "ICMPv6 NA: packet too short\n"); | |
896 | return; | |
897 | } | |
898 | ||
899 | if (ipv6_addr_is_multicast(&msg->target)) { | |
900 | ND_PRINTK2(KERN_WARNING | |
901 | "ICMPv6 NA: target address is multicast.\n"); | |
902 | return; | |
903 | } | |
904 | ||
905 | if (ipv6_addr_is_multicast(daddr) && | |
906 | msg->icmph.icmp6_solicited) { | |
907 | ND_PRINTK2(KERN_WARNING | |
908 | "ICMPv6 NA: solicited NA is multicasted.\n"); | |
909 | return; | |
910 | } | |
911 | ||
912 | if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) { | |
913 | ND_PRINTK2(KERN_WARNING | |
914 | "ICMPv6 NS: invalid ND option\n"); | |
915 | return; | |
916 | } | |
917 | if (ndopts.nd_opts_tgt_lladdr) { | |
918 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, dev); | |
919 | if (!lladdr) { | |
920 | ND_PRINTK2(KERN_WARNING | |
921 | "ICMPv6 NA: invalid link-layer address length\n"); | |
922 | return; | |
923 | } | |
924 | } | |
925 | if ((ifp = ipv6_get_ifaddr(&msg->target, dev, 1))) { | |
926 | if (ifp->flags & IFA_F_TENTATIVE) { | |
927 | addrconf_dad_failure(ifp); | |
928 | return; | |
929 | } | |
930 | /* What should we make now? The advertisement | |
931 | is invalid, but ndisc specs say nothing | |
932 | about it. It could be misconfiguration, or | |
933 | an smart proxy agent tries to help us :-) | |
934 | */ | |
935 | ND_PRINTK1(KERN_WARNING | |
936 | "ICMPv6 NA: someone advertises our address on %s!\n", | |
937 | ifp->idev->dev->name); | |
938 | in6_ifa_put(ifp); | |
939 | return; | |
940 | } | |
941 | neigh = neigh_lookup(&nd_tbl, &msg->target, dev); | |
942 | ||
943 | if (neigh) { | |
944 | u8 old_flags = neigh->flags; | |
945 | ||
946 | if (neigh->nud_state & NUD_FAILED) | |
947 | goto out; | |
948 | ||
949 | neigh_update(neigh, lladdr, | |
950 | msg->icmph.icmp6_solicited ? NUD_REACHABLE : NUD_STALE, | |
951 | NEIGH_UPDATE_F_WEAK_OVERRIDE| | |
952 | (msg->icmph.icmp6_override ? NEIGH_UPDATE_F_OVERRIDE : 0)| | |
953 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
954 | (msg->icmph.icmp6_router ? NEIGH_UPDATE_F_ISROUTER : 0)); | |
955 | ||
956 | if ((old_flags & ~neigh->flags) & NTF_ROUTER) { | |
957 | /* | |
958 | * Change: router to host | |
959 | */ | |
960 | struct rt6_info *rt; | |
961 | rt = rt6_get_dflt_router(saddr, dev); | |
962 | if (rt) | |
0d51aa80 | 963 | ip6_del_rt(rt, NULL, NULL, NULL); |
1da177e4 LT |
964 | } |
965 | ||
966 | out: | |
967 | neigh_release(neigh); | |
968 | } | |
969 | } | |
970 | ||
971 | static void ndisc_recv_rs(struct sk_buff *skb) | |
972 | { | |
973 | struct rs_msg *rs_msg = (struct rs_msg *) skb->h.raw; | |
974 | unsigned long ndoptlen = skb->len - sizeof(*rs_msg); | |
975 | struct neighbour *neigh; | |
976 | struct inet6_dev *idev; | |
977 | struct in6_addr *saddr = &skb->nh.ipv6h->saddr; | |
978 | struct ndisc_options ndopts; | |
979 | u8 *lladdr = NULL; | |
980 | ||
981 | if (skb->len < sizeof(*rs_msg)) | |
982 | return; | |
983 | ||
984 | idev = in6_dev_get(skb->dev); | |
985 | if (!idev) { | |
986 | if (net_ratelimit()) | |
987 | ND_PRINTK1("ICMP6 RS: can't find in6 device\n"); | |
988 | return; | |
989 | } | |
990 | ||
991 | /* Don't accept RS if we're not in router mode */ | |
992 | if (!idev->cnf.forwarding) | |
993 | goto out; | |
994 | ||
995 | /* | |
996 | * Don't update NCE if src = ::; | |
997 | * this implies that the source node has no ip address assigned yet. | |
998 | */ | |
999 | if (ipv6_addr_any(saddr)) | |
1000 | goto out; | |
1001 | ||
1002 | /* Parse ND options */ | |
1003 | if (!ndisc_parse_options(rs_msg->opt, ndoptlen, &ndopts)) { | |
1004 | if (net_ratelimit()) | |
1005 | ND_PRINTK2("ICMP6 NS: invalid ND option, ignored\n"); | |
1006 | goto out; | |
1007 | } | |
1008 | ||
1009 | if (ndopts.nd_opts_src_lladdr) { | |
1010 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, | |
1011 | skb->dev); | |
1012 | if (!lladdr) | |
1013 | goto out; | |
1014 | } | |
1015 | ||
1016 | neigh = __neigh_lookup(&nd_tbl, saddr, skb->dev, 1); | |
1017 | if (neigh) { | |
1018 | neigh_update(neigh, lladdr, NUD_STALE, | |
1019 | NEIGH_UPDATE_F_WEAK_OVERRIDE| | |
1020 | NEIGH_UPDATE_F_OVERRIDE| | |
1021 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER); | |
1022 | neigh_release(neigh); | |
1023 | } | |
1024 | out: | |
1025 | in6_dev_put(idev); | |
1026 | } | |
1027 | ||
1028 | static void ndisc_router_discovery(struct sk_buff *skb) | |
1029 | { | |
1030 | struct ra_msg *ra_msg = (struct ra_msg *) skb->h.raw; | |
1031 | struct neighbour *neigh = NULL; | |
1032 | struct inet6_dev *in6_dev; | |
65f5c7c1 | 1033 | struct rt6_info *rt = NULL; |
1da177e4 LT |
1034 | int lifetime; |
1035 | struct ndisc_options ndopts; | |
1036 | int optlen; | |
ebacaaa0 | 1037 | unsigned int pref = 0; |
1da177e4 LT |
1038 | |
1039 | __u8 * opt = (__u8 *)(ra_msg + 1); | |
1040 | ||
1041 | optlen = (skb->tail - skb->h.raw) - sizeof(struct ra_msg); | |
1042 | ||
1043 | if (!(ipv6_addr_type(&skb->nh.ipv6h->saddr) & IPV6_ADDR_LINKLOCAL)) { | |
1044 | ND_PRINTK2(KERN_WARNING | |
1045 | "ICMPv6 RA: source address is not link-local.\n"); | |
1046 | return; | |
1047 | } | |
1048 | if (optlen < 0) { | |
1049 | ND_PRINTK2(KERN_WARNING | |
1050 | "ICMPv6 RA: packet too short\n"); | |
1051 | return; | |
1052 | } | |
1053 | ||
1054 | /* | |
1055 | * set the RA_RECV flag in the interface | |
1056 | */ | |
1057 | ||
1058 | in6_dev = in6_dev_get(skb->dev); | |
1059 | if (in6_dev == NULL) { | |
1060 | ND_PRINTK0(KERN_ERR | |
1061 | "ICMPv6 RA: can't find inet6 device for %s.\n", | |
1062 | skb->dev->name); | |
1063 | return; | |
1064 | } | |
1065 | if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_ra) { | |
1066 | in6_dev_put(in6_dev); | |
1067 | return; | |
1068 | } | |
1069 | ||
1070 | if (!ndisc_parse_options(opt, optlen, &ndopts)) { | |
1071 | in6_dev_put(in6_dev); | |
1072 | ND_PRINTK2(KERN_WARNING | |
1073 | "ICMP6 RA: invalid ND options\n"); | |
1074 | return; | |
1075 | } | |
1076 | ||
1077 | if (in6_dev->if_flags & IF_RS_SENT) { | |
1078 | /* | |
1079 | * flag that an RA was received after an RS was sent | |
1080 | * out on this interface. | |
1081 | */ | |
1082 | in6_dev->if_flags |= IF_RA_RCVD; | |
1083 | } | |
1084 | ||
1085 | /* | |
1086 | * Remember the managed/otherconf flags from most recently | |
1087 | * received RA message (RFC 2462) -- yoshfuji | |
1088 | */ | |
1089 | in6_dev->if_flags = (in6_dev->if_flags & ~(IF_RA_MANAGED | | |
1090 | IF_RA_OTHERCONF)) | | |
1091 | (ra_msg->icmph.icmp6_addrconf_managed ? | |
1092 | IF_RA_MANAGED : 0) | | |
1093 | (ra_msg->icmph.icmp6_addrconf_other ? | |
1094 | IF_RA_OTHERCONF : 0); | |
1095 | ||
65f5c7c1 YH |
1096 | if (!in6_dev->cnf.accept_ra_defrtr) |
1097 | goto skip_defrtr; | |
1098 | ||
1da177e4 LT |
1099 | lifetime = ntohs(ra_msg->icmph.icmp6_rt_lifetime); |
1100 | ||
ebacaaa0 YH |
1101 | #ifdef CONFIG_IPV6_ROUTER_PREF |
1102 | pref = ra_msg->icmph.icmp6_router_pref; | |
1103 | /* 10b is handled as if it were 00b (medium) */ | |
930d6ff2 YH |
1104 | if (pref == ICMPV6_ROUTER_PREF_INVALID || |
1105 | in6_dev->cnf.accept_ra_rtr_pref) | |
ebacaaa0 YH |
1106 | pref = ICMPV6_ROUTER_PREF_MEDIUM; |
1107 | #endif | |
1108 | ||
1da177e4 LT |
1109 | rt = rt6_get_dflt_router(&skb->nh.ipv6h->saddr, skb->dev); |
1110 | ||
1111 | if (rt) | |
1112 | neigh = rt->rt6i_nexthop; | |
1113 | ||
1114 | if (rt && lifetime == 0) { | |
1115 | neigh_clone(neigh); | |
0d51aa80 | 1116 | ip6_del_rt(rt, NULL, NULL, NULL); |
1da177e4 LT |
1117 | rt = NULL; |
1118 | } | |
1119 | ||
1120 | if (rt == NULL && lifetime) { | |
1121 | ND_PRINTK3(KERN_DEBUG | |
1122 | "ICMPv6 RA: adding default router.\n"); | |
1123 | ||
ebacaaa0 | 1124 | rt = rt6_add_dflt_router(&skb->nh.ipv6h->saddr, skb->dev, pref); |
1da177e4 LT |
1125 | if (rt == NULL) { |
1126 | ND_PRINTK0(KERN_ERR | |
1127 | "ICMPv6 RA: %s() failed to add default route.\n", | |
1128 | __FUNCTION__); | |
1129 | in6_dev_put(in6_dev); | |
1130 | return; | |
1131 | } | |
1132 | ||
1133 | neigh = rt->rt6i_nexthop; | |
1134 | if (neigh == NULL) { | |
1135 | ND_PRINTK0(KERN_ERR | |
1136 | "ICMPv6 RA: %s() got default router without neighbour.\n", | |
1137 | __FUNCTION__); | |
1138 | dst_release(&rt->u.dst); | |
1139 | in6_dev_put(in6_dev); | |
1140 | return; | |
1141 | } | |
1142 | neigh->flags |= NTF_ROUTER; | |
ebacaaa0 YH |
1143 | } else if (rt) { |
1144 | rt->rt6i_flags |= (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); | |
1da177e4 LT |
1145 | } |
1146 | ||
1147 | if (rt) | |
1148 | rt->rt6i_expires = jiffies + (HZ * lifetime); | |
1149 | ||
1150 | if (ra_msg->icmph.icmp6_hop_limit) { | |
1151 | in6_dev->cnf.hop_limit = ra_msg->icmph.icmp6_hop_limit; | |
1152 | if (rt) | |
1153 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = ra_msg->icmph.icmp6_hop_limit; | |
1154 | } | |
1155 | ||
65f5c7c1 YH |
1156 | skip_defrtr: |
1157 | ||
1da177e4 LT |
1158 | /* |
1159 | * Update Reachable Time and Retrans Timer | |
1160 | */ | |
1161 | ||
1162 | if (in6_dev->nd_parms) { | |
1163 | unsigned long rtime = ntohl(ra_msg->retrans_timer); | |
1164 | ||
1165 | if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/HZ) { | |
1166 | rtime = (rtime*HZ)/1000; | |
1167 | if (rtime < HZ/10) | |
1168 | rtime = HZ/10; | |
1169 | in6_dev->nd_parms->retrans_time = rtime; | |
1170 | in6_dev->tstamp = jiffies; | |
1171 | inet6_ifinfo_notify(RTM_NEWLINK, in6_dev); | |
1172 | } | |
1173 | ||
1174 | rtime = ntohl(ra_msg->reachable_time); | |
1175 | if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/(3*HZ)) { | |
1176 | rtime = (rtime*HZ)/1000; | |
1177 | ||
1178 | if (rtime < HZ/10) | |
1179 | rtime = HZ/10; | |
1180 | ||
1181 | if (rtime != in6_dev->nd_parms->base_reachable_time) { | |
1182 | in6_dev->nd_parms->base_reachable_time = rtime; | |
1183 | in6_dev->nd_parms->gc_staletime = 3 * rtime; | |
1184 | in6_dev->nd_parms->reachable_time = neigh_rand_reach_time(rtime); | |
1185 | in6_dev->tstamp = jiffies; | |
1186 | inet6_ifinfo_notify(RTM_NEWLINK, in6_dev); | |
1187 | } | |
1188 | } | |
1189 | } | |
1190 | ||
1191 | /* | |
1192 | * Process options. | |
1193 | */ | |
1194 | ||
1195 | if (!neigh) | |
1196 | neigh = __neigh_lookup(&nd_tbl, &skb->nh.ipv6h->saddr, | |
1197 | skb->dev, 1); | |
1198 | if (neigh) { | |
1199 | u8 *lladdr = NULL; | |
1200 | if (ndopts.nd_opts_src_lladdr) { | |
1201 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, | |
1202 | skb->dev); | |
1203 | if (!lladdr) { | |
1204 | ND_PRINTK2(KERN_WARNING | |
1205 | "ICMPv6 RA: invalid link-layer address length\n"); | |
1206 | goto out; | |
1207 | } | |
1208 | } | |
1209 | neigh_update(neigh, lladdr, NUD_STALE, | |
1210 | NEIGH_UPDATE_F_WEAK_OVERRIDE| | |
1211 | NEIGH_UPDATE_F_OVERRIDE| | |
1212 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
1213 | NEIGH_UPDATE_F_ISROUTER); | |
1214 | } | |
1215 | ||
70ceb4f5 YH |
1216 | #ifdef CONFIG_IPV6_ROUTE_INFO |
1217 | if (ndopts.nd_opts_ri) { | |
1218 | struct nd_opt_hdr *p; | |
1219 | for (p = ndopts.nd_opts_ri; | |
1220 | p; | |
1221 | p = ndisc_next_option(p, ndopts.nd_opts_ri_end)) { | |
1222 | rt6_route_rcv(skb->dev, (u8*)p, (p->nd_opt_len) << 3, | |
1223 | &skb->nh.ipv6h->saddr); | |
1224 | } | |
1225 | } | |
1226 | #endif | |
1227 | ||
c4fd30eb | 1228 | if (in6_dev->cnf.accept_ra_pinfo && ndopts.nd_opts_pi) { |
1da177e4 LT |
1229 | struct nd_opt_hdr *p; |
1230 | for (p = ndopts.nd_opts_pi; | |
1231 | p; | |
1232 | p = ndisc_next_option(p, ndopts.nd_opts_pi_end)) { | |
1233 | addrconf_prefix_rcv(skb->dev, (u8*)p, (p->nd_opt_len) << 3); | |
1234 | } | |
1235 | } | |
1236 | ||
1237 | if (ndopts.nd_opts_mtu) { | |
1238 | u32 mtu; | |
1239 | ||
1240 | memcpy(&mtu, ((u8*)(ndopts.nd_opts_mtu+1))+2, sizeof(mtu)); | |
1241 | mtu = ntohl(mtu); | |
1242 | ||
1243 | if (mtu < IPV6_MIN_MTU || mtu > skb->dev->mtu) { | |
1244 | ND_PRINTK2(KERN_WARNING | |
1245 | "ICMPv6 RA: invalid mtu: %d\n", | |
1246 | mtu); | |
1247 | } else if (in6_dev->cnf.mtu6 != mtu) { | |
1248 | in6_dev->cnf.mtu6 = mtu; | |
1249 | ||
1250 | if (rt) | |
1251 | rt->u.dst.metrics[RTAX_MTU-1] = mtu; | |
1252 | ||
1253 | rt6_mtu_change(skb->dev, mtu); | |
1254 | } | |
1255 | } | |
1256 | ||
1257 | if (ndopts.nd_opts_tgt_lladdr || ndopts.nd_opts_rh) { | |
1258 | ND_PRINTK2(KERN_WARNING | |
1259 | "ICMPv6 RA: invalid RA options"); | |
1260 | } | |
1261 | out: | |
1262 | if (rt) | |
1263 | dst_release(&rt->u.dst); | |
1264 | else if (neigh) | |
1265 | neigh_release(neigh); | |
1266 | in6_dev_put(in6_dev); | |
1267 | } | |
1268 | ||
1269 | static void ndisc_redirect_rcv(struct sk_buff *skb) | |
1270 | { | |
1271 | struct inet6_dev *in6_dev; | |
1272 | struct icmp6hdr *icmph; | |
1273 | struct in6_addr *dest; | |
1274 | struct in6_addr *target; /* new first hop to destination */ | |
1275 | struct neighbour *neigh; | |
1276 | int on_link = 0; | |
1277 | struct ndisc_options ndopts; | |
1278 | int optlen; | |
1279 | u8 *lladdr = NULL; | |
1280 | ||
1281 | if (!(ipv6_addr_type(&skb->nh.ipv6h->saddr) & IPV6_ADDR_LINKLOCAL)) { | |
1282 | ND_PRINTK2(KERN_WARNING | |
1283 | "ICMPv6 Redirect: source address is not link-local.\n"); | |
1284 | return; | |
1285 | } | |
1286 | ||
1287 | optlen = skb->tail - skb->h.raw; | |
1288 | optlen -= sizeof(struct icmp6hdr) + 2 * sizeof(struct in6_addr); | |
1289 | ||
1290 | if (optlen < 0) { | |
1291 | ND_PRINTK2(KERN_WARNING | |
1292 | "ICMPv6 Redirect: packet too short\n"); | |
1293 | return; | |
1294 | } | |
1295 | ||
1296 | icmph = (struct icmp6hdr *) skb->h.raw; | |
1297 | target = (struct in6_addr *) (icmph + 1); | |
1298 | dest = target + 1; | |
1299 | ||
1300 | if (ipv6_addr_is_multicast(dest)) { | |
1301 | ND_PRINTK2(KERN_WARNING | |
1302 | "ICMPv6 Redirect: destination address is multicast.\n"); | |
1303 | return; | |
1304 | } | |
1305 | ||
1306 | if (ipv6_addr_equal(dest, target)) { | |
1307 | on_link = 1; | |
1308 | } else if (!(ipv6_addr_type(target) & IPV6_ADDR_LINKLOCAL)) { | |
1309 | ND_PRINTK2(KERN_WARNING | |
1310 | "ICMPv6 Redirect: target address is not link-local.\n"); | |
1311 | return; | |
1312 | } | |
1313 | ||
1314 | in6_dev = in6_dev_get(skb->dev); | |
1315 | if (!in6_dev) | |
1316 | return; | |
1317 | if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects) { | |
1318 | in6_dev_put(in6_dev); | |
1319 | return; | |
1320 | } | |
1321 | ||
1322 | /* RFC2461 8.1: | |
1323 | * The IP source address of the Redirect MUST be the same as the current | |
1324 | * first-hop router for the specified ICMP Destination Address. | |
1325 | */ | |
1326 | ||
1327 | if (!ndisc_parse_options((u8*)(dest + 1), optlen, &ndopts)) { | |
1328 | ND_PRINTK2(KERN_WARNING | |
1329 | "ICMPv6 Redirect: invalid ND options\n"); | |
1330 | in6_dev_put(in6_dev); | |
1331 | return; | |
1332 | } | |
1333 | if (ndopts.nd_opts_tgt_lladdr) { | |
1334 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, | |
1335 | skb->dev); | |
1336 | if (!lladdr) { | |
1337 | ND_PRINTK2(KERN_WARNING | |
1338 | "ICMPv6 Redirect: invalid link-layer address length\n"); | |
1339 | in6_dev_put(in6_dev); | |
1340 | return; | |
1341 | } | |
1342 | } | |
1343 | ||
1344 | neigh = __neigh_lookup(&nd_tbl, target, skb->dev, 1); | |
1345 | if (neigh) { | |
1346 | rt6_redirect(dest, &skb->nh.ipv6h->saddr, neigh, lladdr, | |
1347 | on_link); | |
1348 | neigh_release(neigh); | |
1349 | } | |
1350 | in6_dev_put(in6_dev); | |
1351 | } | |
1352 | ||
1353 | void ndisc_send_redirect(struct sk_buff *skb, struct neighbour *neigh, | |
1354 | struct in6_addr *target) | |
1355 | { | |
1356 | struct sock *sk = ndisc_socket->sk; | |
1357 | int len = sizeof(struct icmp6hdr) + 2 * sizeof(struct in6_addr); | |
1358 | struct sk_buff *buff; | |
1359 | struct icmp6hdr *icmph; | |
1360 | struct in6_addr saddr_buf; | |
1361 | struct in6_addr *addrp; | |
1362 | struct net_device *dev; | |
1363 | struct rt6_info *rt; | |
1364 | struct dst_entry *dst; | |
1365 | struct inet6_dev *idev; | |
1366 | struct flowi fl; | |
1367 | u8 *opt; | |
1368 | int rd_len; | |
1369 | int err; | |
1370 | int hlen; | |
1371 | u8 ha_buf[MAX_ADDR_LEN], *ha = NULL; | |
1372 | ||
1373 | dev = skb->dev; | |
1374 | ||
1375 | if (ipv6_get_lladdr(dev, &saddr_buf)) { | |
1376 | ND_PRINTK2(KERN_WARNING | |
1377 | "ICMPv6 Redirect: no link-local address on %s\n", | |
1378 | dev->name); | |
1379 | return; | |
1380 | } | |
1381 | ||
1382 | ndisc_flow_init(&fl, NDISC_REDIRECT, &saddr_buf, &skb->nh.ipv6h->saddr); | |
1383 | ||
1384 | dst = ip6_route_output(NULL, &fl); | |
1385 | if (dst == NULL) | |
1386 | return; | |
1387 | ||
1388 | err = xfrm_lookup(&dst, &fl, NULL, 0); | |
e104411b | 1389 | if (err) |
1da177e4 | 1390 | return; |
1da177e4 LT |
1391 | |
1392 | rt = (struct rt6_info *) dst; | |
1393 | ||
1394 | if (rt->rt6i_flags & RTF_GATEWAY) { | |
1395 | ND_PRINTK2(KERN_WARNING | |
1396 | "ICMPv6 Redirect: destination is not a neighbour.\n"); | |
1397 | dst_release(dst); | |
1398 | return; | |
1399 | } | |
1400 | if (!xrlim_allow(dst, 1*HZ)) { | |
1401 | dst_release(dst); | |
1402 | return; | |
1403 | } | |
1404 | ||
1405 | if (dev->addr_len) { | |
1406 | read_lock_bh(&neigh->lock); | |
1407 | if (neigh->nud_state & NUD_VALID) { | |
1408 | memcpy(ha_buf, neigh->ha, dev->addr_len); | |
1409 | read_unlock_bh(&neigh->lock); | |
1410 | ha = ha_buf; | |
1411 | len += ndisc_opt_addr_space(dev); | |
1412 | } else | |
1413 | read_unlock_bh(&neigh->lock); | |
1414 | } | |
1415 | ||
1416 | rd_len = min_t(unsigned int, | |
1417 | IPV6_MIN_MTU-sizeof(struct ipv6hdr)-len, skb->len + 8); | |
1418 | rd_len &= ~0x7; | |
1419 | len += rd_len; | |
1420 | ||
1421 | buff = sock_alloc_send_skb(sk, MAX_HEADER + len + LL_RESERVED_SPACE(dev), | |
1422 | 1, &err); | |
1423 | if (buff == NULL) { | |
1424 | ND_PRINTK0(KERN_ERR | |
1425 | "ICMPv6 Redirect: %s() failed to allocate an skb.\n", | |
1426 | __FUNCTION__); | |
1427 | dst_release(dst); | |
1428 | return; | |
1429 | } | |
1430 | ||
1431 | hlen = 0; | |
1432 | ||
1433 | skb_reserve(buff, LL_RESERVED_SPACE(dev)); | |
1434 | ip6_nd_hdr(sk, buff, dev, &saddr_buf, &skb->nh.ipv6h->saddr, | |
1435 | IPPROTO_ICMPV6, len); | |
1436 | ||
1437 | icmph = (struct icmp6hdr *)skb_put(buff, len); | |
1438 | buff->h.raw = (unsigned char*)icmph; | |
1439 | ||
1440 | memset(icmph, 0, sizeof(struct icmp6hdr)); | |
1441 | icmph->icmp6_type = NDISC_REDIRECT; | |
1442 | ||
1443 | /* | |
1444 | * copy target and destination addresses | |
1445 | */ | |
1446 | ||
1447 | addrp = (struct in6_addr *)(icmph + 1); | |
1448 | ipv6_addr_copy(addrp, target); | |
1449 | addrp++; | |
1450 | ipv6_addr_copy(addrp, &skb->nh.ipv6h->daddr); | |
1451 | ||
1452 | opt = (u8*) (addrp + 1); | |
1453 | ||
1454 | /* | |
1455 | * include target_address option | |
1456 | */ | |
1457 | ||
1458 | if (ha) | |
1459 | opt = ndisc_fill_addr_option(opt, ND_OPT_TARGET_LL_ADDR, ha, | |
1460 | dev->addr_len, dev->type); | |
1461 | ||
1462 | /* | |
1463 | * build redirect option and copy skb over to the new packet. | |
1464 | */ | |
1465 | ||
1466 | memset(opt, 0, 8); | |
1467 | *(opt++) = ND_OPT_REDIRECT_HDR; | |
1468 | *(opt++) = (rd_len >> 3); | |
1469 | opt += 6; | |
1470 | ||
1471 | memcpy(opt, skb->nh.ipv6h, rd_len - 8); | |
1472 | ||
1473 | icmph->icmp6_cksum = csum_ipv6_magic(&saddr_buf, &skb->nh.ipv6h->saddr, | |
1474 | len, IPPROTO_ICMPV6, | |
1475 | csum_partial((u8 *) icmph, len, 0)); | |
1476 | ||
1477 | buff->dst = dst; | |
1478 | idev = in6_dev_get(dst->dev); | |
1479 | IP6_INC_STATS(IPSTATS_MIB_OUTREQUESTS); | |
1480 | err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, buff, NULL, dst->dev, dst_output); | |
1481 | if (!err) { | |
1482 | ICMP6_INC_STATS(idev, ICMP6_MIB_OUTREDIRECTS); | |
1483 | ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS); | |
1484 | } | |
1485 | ||
1486 | if (likely(idev != NULL)) | |
1487 | in6_dev_put(idev); | |
1488 | } | |
1489 | ||
1490 | static void pndisc_redo(struct sk_buff *skb) | |
1491 | { | |
140e26fc | 1492 | ndisc_recv_ns(skb); |
1da177e4 LT |
1493 | kfree_skb(skb); |
1494 | } | |
1495 | ||
1496 | int ndisc_rcv(struct sk_buff *skb) | |
1497 | { | |
1498 | struct nd_msg *msg; | |
1499 | ||
1500 | if (!pskb_may_pull(skb, skb->len)) | |
1501 | return 0; | |
1502 | ||
1503 | msg = (struct nd_msg *) skb->h.raw; | |
1504 | ||
1505 | __skb_push(skb, skb->data-skb->h.raw); | |
1506 | ||
1507 | if (skb->nh.ipv6h->hop_limit != 255) { | |
1508 | ND_PRINTK2(KERN_WARNING | |
1509 | "ICMPv6 NDISC: invalid hop-limit: %d\n", | |
1510 | skb->nh.ipv6h->hop_limit); | |
1511 | return 0; | |
1512 | } | |
1513 | ||
1514 | if (msg->icmph.icmp6_code != 0) { | |
1515 | ND_PRINTK2(KERN_WARNING | |
1516 | "ICMPv6 NDISC: invalid ICMPv6 code: %d\n", | |
1517 | msg->icmph.icmp6_code); | |
1518 | return 0; | |
1519 | } | |
1520 | ||
a61bbcf2 PM |
1521 | memset(NEIGH_CB(skb), 0, sizeof(struct neighbour_cb)); |
1522 | ||
1da177e4 LT |
1523 | switch (msg->icmph.icmp6_type) { |
1524 | case NDISC_NEIGHBOUR_SOLICITATION: | |
1525 | ndisc_recv_ns(skb); | |
1526 | break; | |
1527 | ||
1528 | case NDISC_NEIGHBOUR_ADVERTISEMENT: | |
1529 | ndisc_recv_na(skb); | |
1530 | break; | |
1531 | ||
1532 | case NDISC_ROUTER_SOLICITATION: | |
1533 | ndisc_recv_rs(skb); | |
1534 | break; | |
1535 | ||
1536 | case NDISC_ROUTER_ADVERTISEMENT: | |
1537 | ndisc_router_discovery(skb); | |
1538 | break; | |
1539 | ||
1540 | case NDISC_REDIRECT: | |
1541 | ndisc_redirect_rcv(skb); | |
1542 | break; | |
1543 | }; | |
1544 | ||
1545 | return 0; | |
1546 | } | |
1547 | ||
1548 | static int ndisc_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1549 | { | |
1550 | struct net_device *dev = ptr; | |
1551 | ||
1552 | switch (event) { | |
1553 | case NETDEV_CHANGEADDR: | |
1554 | neigh_changeaddr(&nd_tbl, dev); | |
1555 | fib6_run_gc(~0UL); | |
1556 | break; | |
1557 | case NETDEV_DOWN: | |
1558 | neigh_ifdown(&nd_tbl, dev); | |
1559 | fib6_run_gc(~0UL); | |
1560 | break; | |
1561 | default: | |
1562 | break; | |
1563 | } | |
1564 | ||
1565 | return NOTIFY_DONE; | |
1566 | } | |
1567 | ||
1568 | static struct notifier_block ndisc_netdev_notifier = { | |
1569 | .notifier_call = ndisc_netdev_event, | |
1570 | }; | |
1571 | ||
1572 | #ifdef CONFIG_SYSCTL | |
1573 | static void ndisc_warn_deprecated_sysctl(struct ctl_table *ctl, | |
1574 | const char *func, const char *dev_name) | |
1575 | { | |
1576 | static char warncomm[TASK_COMM_LEN]; | |
1577 | static int warned; | |
1578 | if (strcmp(warncomm, current->comm) && warned < 5) { | |
1579 | strcpy(warncomm, current->comm); | |
1580 | printk(KERN_WARNING | |
1581 | "process `%s' is using deprecated sysctl (%s) " | |
1582 | "net.ipv6.neigh.%s.%s; " | |
1583 | "Use net.ipv6.neigh.%s.%s_ms " | |
1584 | "instead.\n", | |
1585 | warncomm, func, | |
1586 | dev_name, ctl->procname, | |
1587 | dev_name, ctl->procname); | |
1588 | warned++; | |
1589 | } | |
1590 | } | |
1591 | ||
1592 | int ndisc_ifinfo_sysctl_change(struct ctl_table *ctl, int write, struct file * filp, void __user *buffer, size_t *lenp, loff_t *ppos) | |
1593 | { | |
1594 | struct net_device *dev = ctl->extra1; | |
1595 | struct inet6_dev *idev; | |
1596 | int ret; | |
1597 | ||
1598 | if (ctl->ctl_name == NET_NEIGH_RETRANS_TIME || | |
1599 | ctl->ctl_name == NET_NEIGH_REACHABLE_TIME) | |
1600 | ndisc_warn_deprecated_sysctl(ctl, "syscall", dev ? dev->name : "default"); | |
1601 | ||
1602 | switch (ctl->ctl_name) { | |
1603 | case NET_NEIGH_RETRANS_TIME: | |
1604 | ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos); | |
1605 | break; | |
1606 | case NET_NEIGH_REACHABLE_TIME: | |
1607 | ret = proc_dointvec_jiffies(ctl, write, | |
1608 | filp, buffer, lenp, ppos); | |
1609 | break; | |
1610 | case NET_NEIGH_RETRANS_TIME_MS: | |
1611 | case NET_NEIGH_REACHABLE_TIME_MS: | |
1612 | ret = proc_dointvec_ms_jiffies(ctl, write, | |
1613 | filp, buffer, lenp, ppos); | |
1614 | break; | |
1615 | default: | |
1616 | ret = -1; | |
1617 | } | |
1618 | ||
1619 | if (write && ret == 0 && dev && (idev = in6_dev_get(dev)) != NULL) { | |
1620 | if (ctl->ctl_name == NET_NEIGH_REACHABLE_TIME || | |
1621 | ctl->ctl_name == NET_NEIGH_REACHABLE_TIME_MS) | |
1622 | idev->nd_parms->reachable_time = neigh_rand_reach_time(idev->nd_parms->base_reachable_time); | |
1623 | idev->tstamp = jiffies; | |
1624 | inet6_ifinfo_notify(RTM_NEWLINK, idev); | |
1625 | in6_dev_put(idev); | |
1626 | } | |
1627 | return ret; | |
1628 | } | |
1629 | ||
1630 | static int ndisc_ifinfo_sysctl_strategy(ctl_table *ctl, int __user *name, | |
1631 | int nlen, void __user *oldval, | |
1632 | size_t __user *oldlenp, | |
1633 | void __user *newval, size_t newlen, | |
1634 | void **context) | |
1635 | { | |
1636 | struct net_device *dev = ctl->extra1; | |
1637 | struct inet6_dev *idev; | |
1638 | int ret; | |
1639 | ||
1640 | if (ctl->ctl_name == NET_NEIGH_RETRANS_TIME || | |
1641 | ctl->ctl_name == NET_NEIGH_REACHABLE_TIME) | |
1642 | ndisc_warn_deprecated_sysctl(ctl, "procfs", dev ? dev->name : "default"); | |
1643 | ||
1644 | switch (ctl->ctl_name) { | |
1645 | case NET_NEIGH_REACHABLE_TIME: | |
1646 | ret = sysctl_jiffies(ctl, name, nlen, | |
1647 | oldval, oldlenp, newval, newlen, | |
1648 | context); | |
1649 | break; | |
1650 | case NET_NEIGH_RETRANS_TIME_MS: | |
1651 | case NET_NEIGH_REACHABLE_TIME_MS: | |
1652 | ret = sysctl_ms_jiffies(ctl, name, nlen, | |
1653 | oldval, oldlenp, newval, newlen, | |
1654 | context); | |
1655 | break; | |
1656 | default: | |
1657 | ret = 0; | |
1658 | } | |
1659 | ||
1660 | if (newval && newlen && ret > 0 && | |
1661 | dev && (idev = in6_dev_get(dev)) != NULL) { | |
1662 | if (ctl->ctl_name == NET_NEIGH_REACHABLE_TIME || | |
1663 | ctl->ctl_name == NET_NEIGH_REACHABLE_TIME_MS) | |
1664 | idev->nd_parms->reachable_time = neigh_rand_reach_time(idev->nd_parms->base_reachable_time); | |
1665 | idev->tstamp = jiffies; | |
1666 | inet6_ifinfo_notify(RTM_NEWLINK, idev); | |
1667 | in6_dev_put(idev); | |
1668 | } | |
1669 | ||
1670 | return ret; | |
1671 | } | |
1672 | ||
1673 | #endif | |
1674 | ||
1675 | int __init ndisc_init(struct net_proto_family *ops) | |
1676 | { | |
1677 | struct ipv6_pinfo *np; | |
1678 | struct sock *sk; | |
1679 | int err; | |
1680 | ||
1681 | err = sock_create_kern(PF_INET6, SOCK_RAW, IPPROTO_ICMPV6, &ndisc_socket); | |
1682 | if (err < 0) { | |
1683 | ND_PRINTK0(KERN_ERR | |
1684 | "ICMPv6 NDISC: Failed to initialize the control socket (err %d).\n", | |
1685 | err); | |
1686 | ndisc_socket = NULL; /* For safety. */ | |
1687 | return err; | |
1688 | } | |
1689 | ||
1690 | sk = ndisc_socket->sk; | |
1691 | np = inet6_sk(sk); | |
1692 | sk->sk_allocation = GFP_ATOMIC; | |
1693 | np->hop_limit = 255; | |
1694 | /* Do not loopback ndisc messages */ | |
1695 | np->mc_loop = 0; | |
1696 | sk->sk_prot->unhash(sk); | |
1697 | ||
1698 | /* | |
1699 | * Initialize the neighbour table | |
1700 | */ | |
1701 | ||
1702 | neigh_table_init(&nd_tbl); | |
1703 | ||
1704 | #ifdef CONFIG_SYSCTL | |
1705 | neigh_sysctl_register(NULL, &nd_tbl.parms, NET_IPV6, NET_IPV6_NEIGH, | |
1706 | "ipv6", | |
1707 | &ndisc_ifinfo_sysctl_change, | |
1708 | &ndisc_ifinfo_sysctl_strategy); | |
1709 | #endif | |
1710 | ||
1711 | register_netdevice_notifier(&ndisc_netdev_notifier); | |
1712 | return 0; | |
1713 | } | |
1714 | ||
1715 | void ndisc_cleanup(void) | |
1716 | { | |
1717 | #ifdef CONFIG_SYSCTL | |
1718 | neigh_sysctl_unregister(&nd_tbl.parms); | |
1719 | #endif | |
1720 | neigh_table_clear(&nd_tbl); | |
1721 | sock_release(ndisc_socket); | |
1722 | ndisc_socket = NULL; /* For safety. */ | |
1723 | } |