Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Neighbour Discovery for IPv6 | |
1ab1457c | 3 | * Linux INET6 implementation |
1da177e4 LT |
4 | * |
5 | * Authors: | |
1ab1457c | 6 | * Pedro Roque <roque@di.fc.ul.pt> |
1da177e4 LT |
7 | * Mike Shaver <shaver@ingenia.com> |
8 | * | |
9 | * This program is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU General Public License | |
11 | * as published by the Free Software Foundation; either version | |
12 | * 2 of the License, or (at your option) any later version. | |
13 | */ | |
14 | ||
15 | /* | |
16 | * Changes: | |
17 | * | |
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 | ||
7159039a YH |
322 | EXPORT_SYMBOL(ndisc_mc_map); |
323 | ||
1da177e4 LT |
324 | static u32 ndisc_hash(const void *pkey, const struct net_device *dev) |
325 | { | |
326 | const u32 *p32 = pkey; | |
327 | u32 addr_hash, i; | |
328 | ||
329 | addr_hash = 0; | |
330 | for (i = 0; i < (sizeof(struct in6_addr) / sizeof(u32)); i++) | |
331 | addr_hash ^= *p32++; | |
332 | ||
333 | return jhash_2words(addr_hash, dev->ifindex, nd_tbl.hash_rnd); | |
334 | } | |
335 | ||
336 | static int ndisc_constructor(struct neighbour *neigh) | |
337 | { | |
338 | struct in6_addr *addr = (struct in6_addr*)&neigh->primary_key; | |
339 | struct net_device *dev = neigh->dev; | |
340 | struct inet6_dev *in6_dev; | |
341 | struct neigh_parms *parms; | |
342 | int is_multicast = ipv6_addr_is_multicast(addr); | |
343 | ||
344 | rcu_read_lock(); | |
345 | in6_dev = in6_dev_get(dev); | |
346 | if (in6_dev == NULL) { | |
347 | rcu_read_unlock(); | |
348 | return -EINVAL; | |
349 | } | |
350 | ||
351 | parms = in6_dev->nd_parms; | |
352 | __neigh_parms_put(neigh->parms); | |
353 | neigh->parms = neigh_parms_clone(parms); | |
354 | rcu_read_unlock(); | |
355 | ||
356 | neigh->type = is_multicast ? RTN_MULTICAST : RTN_UNICAST; | |
357 | if (dev->hard_header == NULL) { | |
358 | neigh->nud_state = NUD_NOARP; | |
359 | neigh->ops = &ndisc_direct_ops; | |
360 | neigh->output = neigh->ops->queue_xmit; | |
361 | } else { | |
362 | if (is_multicast) { | |
363 | neigh->nud_state = NUD_NOARP; | |
364 | ndisc_mc_map(addr, neigh->ha, dev, 1); | |
365 | } else if (dev->flags&(IFF_NOARP|IFF_LOOPBACK)) { | |
366 | neigh->nud_state = NUD_NOARP; | |
367 | memcpy(neigh->ha, dev->dev_addr, dev->addr_len); | |
368 | if (dev->flags&IFF_LOOPBACK) | |
369 | neigh->type = RTN_LOCAL; | |
370 | } else if (dev->flags&IFF_POINTOPOINT) { | |
371 | neigh->nud_state = NUD_NOARP; | |
372 | memcpy(neigh->ha, dev->broadcast, dev->addr_len); | |
373 | } | |
374 | if (dev->hard_header_cache) | |
375 | neigh->ops = &ndisc_hh_ops; | |
376 | else | |
377 | neigh->ops = &ndisc_generic_ops; | |
378 | if (neigh->nud_state&NUD_VALID) | |
379 | neigh->output = neigh->ops->connected_output; | |
380 | else | |
381 | neigh->output = neigh->ops->output; | |
382 | } | |
383 | in6_dev_put(in6_dev); | |
384 | return 0; | |
385 | } | |
386 | ||
387 | static int pndisc_constructor(struct pneigh_entry *n) | |
388 | { | |
389 | struct in6_addr *addr = (struct in6_addr*)&n->key; | |
390 | struct in6_addr maddr; | |
391 | struct net_device *dev = n->dev; | |
392 | ||
393 | if (dev == NULL || __in6_dev_get(dev) == NULL) | |
394 | return -EINVAL; | |
395 | addrconf_addr_solict_mult(addr, &maddr); | |
396 | ipv6_dev_mc_inc(dev, &maddr); | |
397 | return 0; | |
398 | } | |
399 | ||
400 | static void pndisc_destructor(struct pneigh_entry *n) | |
401 | { | |
402 | struct in6_addr *addr = (struct in6_addr*)&n->key; | |
403 | struct in6_addr maddr; | |
404 | struct net_device *dev = n->dev; | |
405 | ||
406 | if (dev == NULL || __in6_dev_get(dev) == NULL) | |
407 | return; | |
408 | addrconf_addr_solict_mult(addr, &maddr); | |
409 | ipv6_dev_mc_dec(dev, &maddr); | |
410 | } | |
411 | ||
412 | /* | |
413 | * Send a Neighbour Advertisement | |
414 | */ | |
415 | ||
416 | static inline void ndisc_flow_init(struct flowi *fl, u8 type, | |
af184765 YH |
417 | struct in6_addr *saddr, struct in6_addr *daddr, |
418 | int oif) | |
1da177e4 LT |
419 | { |
420 | memset(fl, 0, sizeof(*fl)); | |
421 | ipv6_addr_copy(&fl->fl6_src, saddr); | |
422 | ipv6_addr_copy(&fl->fl6_dst, daddr); | |
423 | fl->proto = IPPROTO_ICMPV6; | |
424 | fl->fl_icmp_type = type; | |
425 | fl->fl_icmp_code = 0; | |
af184765 | 426 | fl->oif = oif; |
beb8d13b | 427 | security_sk_classify_flow(ndisc_socket->sk, fl); |
1da177e4 LT |
428 | } |
429 | ||
430 | static void ndisc_send_na(struct net_device *dev, struct neighbour *neigh, | |
431 | struct in6_addr *daddr, struct in6_addr *solicited_addr, | |
1ab1457c | 432 | int router, int solicited, int override, int inc_opt) |
1da177e4 LT |
433 | { |
434 | struct in6_addr tmpaddr; | |
435 | struct inet6_ifaddr *ifp; | |
436 | struct inet6_dev *idev; | |
437 | struct flowi fl; | |
438 | struct dst_entry* dst; | |
1ab1457c | 439 | struct sock *sk = ndisc_socket->sk; |
1da177e4 | 440 | struct in6_addr *src_addr; |
1ab1457c YH |
441 | struct nd_msg *msg; |
442 | int len; | |
443 | struct sk_buff *skb; | |
1da177e4 LT |
444 | int err; |
445 | ||
446 | len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr); | |
447 | ||
448 | /* for anycast or proxy, solicited_addr != src_addr */ | |
449 | ifp = ipv6_get_ifaddr(solicited_addr, dev, 1); | |
1ab1457c | 450 | if (ifp) { |
1da177e4 | 451 | src_addr = solicited_addr; |
95c385b4 NH |
452 | if (ifp->flags & IFA_F_OPTIMISTIC) |
453 | override = 0; | |
1da177e4 LT |
454 | in6_ifa_put(ifp); |
455 | } else { | |
456 | if (ipv6_dev_get_saddr(dev, daddr, &tmpaddr)) | |
457 | return; | |
458 | src_addr = &tmpaddr; | |
459 | } | |
460 | ||
af184765 YH |
461 | ndisc_flow_init(&fl, NDISC_NEIGHBOUR_ADVERTISEMENT, src_addr, daddr, |
462 | dev->ifindex); | |
1da177e4 LT |
463 | |
464 | dst = ndisc_dst_alloc(dev, neigh, daddr, ip6_output); | |
465 | if (!dst) | |
466 | return; | |
467 | ||
468 | err = xfrm_lookup(&dst, &fl, NULL, 0); | |
e104411b | 469 | if (err < 0) |
1da177e4 | 470 | return; |
1da177e4 LT |
471 | |
472 | if (inc_opt) { | |
473 | if (dev->addr_len) | |
474 | len += ndisc_opt_addr_space(dev); | |
475 | else | |
476 | inc_opt = 0; | |
477 | } | |
478 | ||
d54a81d3 DM |
479 | skb = sock_alloc_send_skb(sk, |
480 | (MAX_HEADER + sizeof(struct ipv6hdr) + | |
481 | len + LL_RESERVED_SPACE(dev)), | |
1da177e4 LT |
482 | 1, &err); |
483 | ||
484 | if (skb == NULL) { | |
485 | ND_PRINTK0(KERN_ERR | |
1ab1457c | 486 | "ICMPv6 NA: %s() failed to allocate an skb.\n", |
1da177e4 LT |
487 | __FUNCTION__); |
488 | dst_release(dst); | |
489 | return; | |
490 | } | |
491 | ||
492 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); | |
493 | ip6_nd_hdr(sk, skb, dev, src_addr, daddr, IPPROTO_ICMPV6, len); | |
494 | ||
d10ba34b ACM |
495 | skb_set_transport_header(skb, skb->tail - skb->data); |
496 | skb_put(skb, len); | |
497 | msg = (struct nd_msg *)skb_transport_header(skb); | |
1da177e4 | 498 | |
1ab1457c YH |
499 | msg->icmph.icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT; |
500 | msg->icmph.icmp6_code = 0; | |
501 | msg->icmph.icmp6_cksum = 0; | |
1da177e4 | 502 | |
1ab1457c YH |
503 | msg->icmph.icmp6_unused = 0; |
504 | msg->icmph.icmp6_router = router; | |
505 | msg->icmph.icmp6_solicited = solicited; | |
506 | msg->icmph.icmp6_override = override; | |
1da177e4 | 507 | |
1ab1457c | 508 | /* Set the target address. */ |
1da177e4 LT |
509 | ipv6_addr_copy(&msg->target, solicited_addr); |
510 | ||
511 | if (inc_opt) | |
512 | ndisc_fill_addr_option(msg->opt, ND_OPT_TARGET_LL_ADDR, dev->dev_addr, | |
513 | dev->addr_len, dev->type); | |
514 | ||
515 | /* checksum */ | |
1ab1457c | 516 | msg->icmph.icmp6_cksum = csum_ipv6_magic(src_addr, daddr, len, |
1da177e4 | 517 | IPPROTO_ICMPV6, |
1ab1457c | 518 | csum_partial((__u8 *) msg, |
1da177e4 LT |
519 | len, 0)); |
520 | ||
521 | skb->dst = dst; | |
522 | idev = in6_dev_get(dst->dev); | |
a11d206d | 523 | IP6_INC_STATS(idev, IPSTATS_MIB_OUTREQUESTS); |
1da177e4 LT |
524 | err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, dst->dev, dst_output); |
525 | if (!err) { | |
526 | ICMP6_INC_STATS(idev, ICMP6_MIB_OUTNEIGHBORADVERTISEMENTS); | |
527 | ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS); | |
528 | } | |
529 | ||
530 | if (likely(idev != NULL)) | |
531 | in6_dev_put(idev); | |
1ab1457c | 532 | } |
1da177e4 LT |
533 | |
534 | void ndisc_send_ns(struct net_device *dev, struct neighbour *neigh, | |
535 | struct in6_addr *solicit, | |
1ab1457c | 536 | struct in6_addr *daddr, struct in6_addr *saddr) |
1da177e4 LT |
537 | { |
538 | struct flowi fl; | |
539 | struct dst_entry* dst; | |
540 | struct inet6_dev *idev; | |
1ab1457c YH |
541 | struct sock *sk = ndisc_socket->sk; |
542 | struct sk_buff *skb; | |
543 | struct nd_msg *msg; | |
1da177e4 | 544 | struct in6_addr addr_buf; |
1ab1457c | 545 | int len; |
1da177e4 LT |
546 | int err; |
547 | int send_llinfo; | |
548 | ||
549 | if (saddr == NULL) { | |
95c385b4 NH |
550 | if (ipv6_get_lladdr(dev, &addr_buf, |
551 | (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC))) | |
1da177e4 LT |
552 | return; |
553 | saddr = &addr_buf; | |
554 | } | |
555 | ||
af184765 YH |
556 | ndisc_flow_init(&fl, NDISC_NEIGHBOUR_SOLICITATION, saddr, daddr, |
557 | dev->ifindex); | |
1da177e4 LT |
558 | |
559 | dst = ndisc_dst_alloc(dev, neigh, daddr, ip6_output); | |
560 | if (!dst) | |
561 | return; | |
562 | ||
563 | err = xfrm_lookup(&dst, &fl, NULL, 0); | |
e104411b | 564 | if (err < 0) |
1da177e4 | 565 | return; |
1da177e4 LT |
566 | |
567 | len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr); | |
568 | send_llinfo = dev->addr_len && !ipv6_addr_any(saddr); | |
569 | if (send_llinfo) | |
570 | len += ndisc_opt_addr_space(dev); | |
571 | ||
d54a81d3 DM |
572 | skb = sock_alloc_send_skb(sk, |
573 | (MAX_HEADER + sizeof(struct ipv6hdr) + | |
574 | len + LL_RESERVED_SPACE(dev)), | |
1da177e4 LT |
575 | 1, &err); |
576 | if (skb == NULL) { | |
577 | ND_PRINTK0(KERN_ERR | |
1ab1457c | 578 | "ICMPv6 NA: %s() failed to allocate an skb.\n", |
1da177e4 LT |
579 | __FUNCTION__); |
580 | dst_release(dst); | |
581 | return; | |
582 | } | |
583 | ||
584 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); | |
585 | ip6_nd_hdr(sk, skb, dev, saddr, daddr, IPPROTO_ICMPV6, len); | |
586 | ||
d10ba34b ACM |
587 | skb_set_transport_header(skb, skb->tail - skb->data); |
588 | skb_put(skb, len); | |
589 | msg = (struct nd_msg *)skb_transport_header(skb); | |
1da177e4 LT |
590 | msg->icmph.icmp6_type = NDISC_NEIGHBOUR_SOLICITATION; |
591 | msg->icmph.icmp6_code = 0; | |
592 | msg->icmph.icmp6_cksum = 0; | |
593 | msg->icmph.icmp6_unused = 0; | |
594 | ||
595 | /* Set the target address. */ | |
596 | ipv6_addr_copy(&msg->target, solicit); | |
597 | ||
598 | if (send_llinfo) | |
599 | ndisc_fill_addr_option(msg->opt, ND_OPT_SOURCE_LL_ADDR, dev->dev_addr, | |
600 | dev->addr_len, dev->type); | |
601 | ||
602 | /* checksum */ | |
0660e03f | 603 | msg->icmph.icmp6_cksum = csum_ipv6_magic(&ipv6_hdr(skb)->saddr, |
1ab1457c | 604 | daddr, len, |
1da177e4 | 605 | IPPROTO_ICMPV6, |
1ab1457c | 606 | csum_partial((__u8 *) msg, |
1da177e4 LT |
607 | len, 0)); |
608 | /* send it! */ | |
609 | skb->dst = dst; | |
610 | idev = in6_dev_get(dst->dev); | |
a11d206d | 611 | IP6_INC_STATS(idev, IPSTATS_MIB_OUTREQUESTS); |
1da177e4 LT |
612 | err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, dst->dev, dst_output); |
613 | if (!err) { | |
614 | ICMP6_INC_STATS(idev, ICMP6_MIB_OUTNEIGHBORSOLICITS); | |
615 | ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS); | |
616 | } | |
617 | ||
618 | if (likely(idev != NULL)) | |
619 | in6_dev_put(idev); | |
620 | } | |
621 | ||
622 | void ndisc_send_rs(struct net_device *dev, struct in6_addr *saddr, | |
623 | struct in6_addr *daddr) | |
624 | { | |
625 | struct flowi fl; | |
626 | struct dst_entry* dst; | |
627 | struct inet6_dev *idev; | |
628 | struct sock *sk = ndisc_socket->sk; | |
1ab1457c YH |
629 | struct sk_buff *skb; |
630 | struct icmp6hdr *hdr; | |
1da177e4 | 631 | __u8 * opt; |
95c385b4 | 632 | int send_sllao = dev->addr_len; |
1ab1457c | 633 | int len; |
1da177e4 LT |
634 | int err; |
635 | ||
95c385b4 NH |
636 | |
637 | #ifdef CONFIG_IPV6_OPTIMISTIC_DAD | |
638 | /* | |
639 | * According to section 2.2 of RFC 4429, we must not | |
640 | * send router solicitations with a sllao from | |
641 | * optimistic addresses, but we may send the solicitation | |
642 | * if we don't include the sllao. So here we check | |
643 | * if our address is optimistic, and if so, we | |
644 | * supress the inclusion of the sllao. | |
645 | */ | |
646 | if (send_sllao) { | |
ca043569 | 647 | struct inet6_ifaddr *ifp = ipv6_get_ifaddr(saddr, dev, 1); |
95c385b4 NH |
648 | if (ifp) { |
649 | if (ifp->flags & IFA_F_OPTIMISTIC) { | |
ca043569 | 650 | send_sllao = 0; |
95c385b4 | 651 | } |
ca043569 | 652 | in6_ifa_put(ifp); |
95c385b4 NH |
653 | } else { |
654 | send_sllao = 0; | |
655 | } | |
656 | } | |
657 | #endif | |
af184765 YH |
658 | ndisc_flow_init(&fl, NDISC_ROUTER_SOLICITATION, saddr, daddr, |
659 | dev->ifindex); | |
1da177e4 LT |
660 | |
661 | dst = ndisc_dst_alloc(dev, NULL, daddr, ip6_output); | |
662 | if (!dst) | |
663 | return; | |
664 | ||
665 | err = xfrm_lookup(&dst, &fl, NULL, 0); | |
e104411b | 666 | if (err < 0) |
1da177e4 | 667 | return; |
1da177e4 LT |
668 | |
669 | len = sizeof(struct icmp6hdr); | |
95c385b4 | 670 | if (send_sllao) |
1da177e4 LT |
671 | len += ndisc_opt_addr_space(dev); |
672 | ||
1ab1457c | 673 | skb = sock_alloc_send_skb(sk, |
d54a81d3 DM |
674 | (MAX_HEADER + sizeof(struct ipv6hdr) + |
675 | len + LL_RESERVED_SPACE(dev)), | |
1da177e4 LT |
676 | 1, &err); |
677 | if (skb == NULL) { | |
678 | ND_PRINTK0(KERN_ERR | |
1ab1457c | 679 | "ICMPv6 RS: %s() failed to allocate an skb.\n", |
1da177e4 LT |
680 | __FUNCTION__); |
681 | dst_release(dst); | |
682 | return; | |
683 | } | |
684 | ||
685 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); | |
686 | ip6_nd_hdr(sk, skb, dev, saddr, daddr, IPPROTO_ICMPV6, len); | |
687 | ||
d10ba34b ACM |
688 | skb_set_transport_header(skb, skb->tail - skb->data); |
689 | skb_put(skb, len); | |
690 | hdr = icmp6_hdr(skb); | |
1ab1457c YH |
691 | hdr->icmp6_type = NDISC_ROUTER_SOLICITATION; |
692 | hdr->icmp6_code = 0; | |
693 | hdr->icmp6_cksum = 0; | |
694 | hdr->icmp6_unused = 0; | |
1da177e4 LT |
695 | |
696 | opt = (u8*) (hdr + 1); | |
697 | ||
95c385b4 | 698 | if (send_sllao) |
1da177e4 LT |
699 | ndisc_fill_addr_option(opt, ND_OPT_SOURCE_LL_ADDR, dev->dev_addr, |
700 | dev->addr_len, dev->type); | |
701 | ||
702 | /* checksum */ | |
0660e03f | 703 | hdr->icmp6_cksum = csum_ipv6_magic(&ipv6_hdr(skb)->saddr, daddr, len, |
1da177e4 LT |
704 | IPPROTO_ICMPV6, |
705 | csum_partial((__u8 *) hdr, len, 0)); | |
706 | ||
707 | /* send it! */ | |
708 | skb->dst = dst; | |
709 | idev = in6_dev_get(dst->dev); | |
a11d206d | 710 | IP6_INC_STATS(idev, IPSTATS_MIB_OUTREQUESTS); |
1da177e4 LT |
711 | err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, dst->dev, dst_output); |
712 | if (!err) { | |
713 | ICMP6_INC_STATS(idev, ICMP6_MIB_OUTROUTERSOLICITS); | |
714 | ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS); | |
715 | } | |
716 | ||
717 | if (likely(idev != NULL)) | |
718 | in6_dev_put(idev); | |
719 | } | |
1ab1457c | 720 | |
1da177e4 LT |
721 | |
722 | static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb) | |
723 | { | |
724 | /* | |
725 | * "The sender MUST return an ICMP | |
726 | * destination unreachable" | |
727 | */ | |
728 | dst_link_failure(skb); | |
729 | kfree_skb(skb); | |
730 | } | |
731 | ||
732 | /* Called with locked neigh: either read or both */ | |
733 | ||
734 | static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb) | |
735 | { | |
736 | struct in6_addr *saddr = NULL; | |
737 | struct in6_addr mcaddr; | |
738 | struct net_device *dev = neigh->dev; | |
739 | struct in6_addr *target = (struct in6_addr *)&neigh->primary_key; | |
740 | int probes = atomic_read(&neigh->probes); | |
741 | ||
0660e03f ACM |
742 | if (skb && ipv6_chk_addr(&ipv6_hdr(skb)->saddr, dev, 1)) |
743 | saddr = &ipv6_hdr(skb)->saddr; | |
1da177e4 LT |
744 | |
745 | if ((probes -= neigh->parms->ucast_probes) < 0) { | |
746 | if (!(neigh->nud_state & NUD_VALID)) { | |
747 | ND_PRINTK1(KERN_DEBUG | |
748 | "%s(): trying to ucast probe in NUD_INVALID: " | |
46b86a2d | 749 | NIP6_FMT "\n", |
1da177e4 LT |
750 | __FUNCTION__, |
751 | NIP6(*target)); | |
752 | } | |
753 | ndisc_send_ns(dev, neigh, target, target, saddr); | |
754 | } else if ((probes -= neigh->parms->app_probes) < 0) { | |
755 | #ifdef CONFIG_ARPD | |
756 | neigh_app_ns(neigh); | |
757 | #endif | |
758 | } else { | |
759 | addrconf_addr_solict_mult(target, &mcaddr); | |
760 | ndisc_send_ns(dev, NULL, target, &mcaddr, saddr); | |
761 | } | |
762 | } | |
763 | ||
764 | static void ndisc_recv_ns(struct sk_buff *skb) | |
765 | { | |
9c70220b | 766 | struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb); |
0660e03f ACM |
767 | struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; |
768 | struct in6_addr *daddr = &ipv6_hdr(skb)->daddr; | |
1da177e4 LT |
769 | u8 *lladdr = NULL; |
770 | u32 ndoptlen = skb->tail - msg->opt; | |
771 | struct ndisc_options ndopts; | |
772 | struct net_device *dev = skb->dev; | |
773 | struct inet6_ifaddr *ifp; | |
774 | struct inet6_dev *idev = NULL; | |
775 | struct neighbour *neigh; | |
62dd9318 | 776 | struct pneigh_entry *pneigh = NULL; |
1da177e4 LT |
777 | int dad = ipv6_addr_any(saddr); |
778 | int inc; | |
62dd9318 | 779 | int is_router; |
1da177e4 LT |
780 | |
781 | if (ipv6_addr_is_multicast(&msg->target)) { | |
1ab1457c | 782 | ND_PRINTK2(KERN_WARNING |
1da177e4 LT |
783 | "ICMPv6 NS: multicast target address"); |
784 | return; | |
785 | } | |
786 | ||
787 | /* | |
788 | * RFC2461 7.1.1: | |
789 | * DAD has to be destined for solicited node multicast address. | |
790 | */ | |
791 | if (dad && | |
792 | !(daddr->s6_addr32[0] == htonl(0xff020000) && | |
793 | daddr->s6_addr32[1] == htonl(0x00000000) && | |
794 | daddr->s6_addr32[2] == htonl(0x00000001) && | |
795 | daddr->s6_addr [12] == 0xff )) { | |
796 | ND_PRINTK2(KERN_WARNING | |
797 | "ICMPv6 NS: bad DAD packet (wrong destination)\n"); | |
798 | return; | |
799 | } | |
800 | ||
801 | if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) { | |
1ab1457c | 802 | ND_PRINTK2(KERN_WARNING |
1da177e4 LT |
803 | "ICMPv6 NS: invalid ND options\n"); |
804 | return; | |
805 | } | |
806 | ||
807 | if (ndopts.nd_opts_src_lladdr) { | |
808 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, dev); | |
809 | if (!lladdr) { | |
810 | ND_PRINTK2(KERN_WARNING | |
811 | "ICMPv6 NS: invalid link-layer address length\n"); | |
812 | return; | |
813 | } | |
814 | ||
815 | /* RFC2461 7.1.1: | |
1ab1457c YH |
816 | * If the IP source address is the unspecified address, |
817 | * there MUST NOT be source link-layer address option | |
1da177e4 LT |
818 | * in the message. |
819 | */ | |
820 | if (dad) { | |
1ab1457c | 821 | ND_PRINTK2(KERN_WARNING |
1da177e4 LT |
822 | "ICMPv6 NS: bad DAD packet (link-layer address option)\n"); |
823 | return; | |
824 | } | |
825 | } | |
826 | ||
827 | inc = ipv6_addr_is_multicast(daddr); | |
828 | ||
829 | if ((ifp = ipv6_get_ifaddr(&msg->target, dev, 1)) != NULL) { | |
95c385b4 NH |
830 | |
831 | if (ifp->flags & (IFA_F_TENTATIVE|IFA_F_OPTIMISTIC)) { | |
832 | if (dad) { | |
833 | if (dev->type == ARPHRD_IEEE802_TR) { | |
98e399f8 ACM |
834 | const unsigned char *sadr; |
835 | sadr = skb_mac_header(skb); | |
95c385b4 NH |
836 | if (((sadr[8] ^ dev->dev_addr[0]) & 0x7f) == 0 && |
837 | sadr[9] == dev->dev_addr[1] && | |
838 | sadr[10] == dev->dev_addr[2] && | |
839 | sadr[11] == dev->dev_addr[3] && | |
840 | sadr[12] == dev->dev_addr[4] && | |
841 | sadr[13] == dev->dev_addr[5]) { | |
842 | /* looped-back to us */ | |
843 | goto out; | |
844 | } | |
845 | } | |
846 | ||
847 | /* | |
848 | * We are colliding with another node | |
849 | * who is doing DAD | |
850 | * so fail our DAD process | |
851 | */ | |
852 | addrconf_dad_failure(ifp); | |
1da177e4 | 853 | goto out; |
95c385b4 NH |
854 | } else { |
855 | /* | |
856 | * This is not a dad solicitation. | |
857 | * If we are an optimistic node, | |
858 | * we should respond. | |
859 | * Otherwise, we should ignore it. | |
860 | */ | |
861 | if (!(ifp->flags & IFA_F_OPTIMISTIC)) | |
1da177e4 | 862 | goto out; |
1da177e4 | 863 | } |
1da177e4 LT |
864 | } |
865 | ||
866 | idev = ifp->idev; | |
867 | } else { | |
868 | idev = in6_dev_get(dev); | |
869 | if (!idev) { | |
870 | /* XXX: count this drop? */ | |
871 | return; | |
872 | } | |
873 | ||
874 | if (ipv6_chk_acast_addr(dev, &msg->target) || | |
1ab1457c | 875 | (idev->cnf.forwarding && |
fbea49e1 | 876 | (ipv6_devconf.proxy_ndp || idev->cnf.proxy_ndp) && |
62dd9318 VN |
877 | (pneigh = pneigh_lookup(&nd_tbl, |
878 | &msg->target, dev, 0)) != NULL)) { | |
a61bbcf2 | 879 | if (!(NEIGH_CB(skb)->flags & LOCALLY_ENQUEUED) && |
1da177e4 LT |
880 | skb->pkt_type != PACKET_HOST && |
881 | inc != 0 && | |
882 | idev->nd_parms->proxy_delay != 0) { | |
883 | /* | |
884 | * for anycast or proxy, | |
1ab1457c YH |
885 | * sender should delay its response |
886 | * by a random time between 0 and | |
1da177e4 LT |
887 | * MAX_ANYCAST_DELAY_TIME seconds. |
888 | * (RFC2461) -- yoshfuji | |
889 | */ | |
890 | struct sk_buff *n = skb_clone(skb, GFP_ATOMIC); | |
891 | if (n) | |
892 | pneigh_enqueue(&nd_tbl, idev->nd_parms, n); | |
893 | goto out; | |
894 | } | |
895 | } else | |
896 | goto out; | |
897 | } | |
898 | ||
fc26d0ab | 899 | is_router = !!(pneigh ? pneigh->flags & NTF_ROUTER : idev->cnf.forwarding); |
62dd9318 | 900 | |
1da177e4 LT |
901 | if (dad) { |
902 | struct in6_addr maddr; | |
903 | ||
904 | ipv6_addr_all_nodes(&maddr); | |
905 | ndisc_send_na(dev, NULL, &maddr, &msg->target, | |
62dd9318 | 906 | is_router, 0, (ifp != NULL), 1); |
1da177e4 LT |
907 | goto out; |
908 | } | |
909 | ||
910 | if (inc) | |
911 | NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_mcast); | |
912 | else | |
913 | NEIGH_CACHE_STAT_INC(&nd_tbl, rcv_probes_ucast); | |
914 | ||
1ab1457c | 915 | /* |
1da177e4 LT |
916 | * update / create cache entry |
917 | * for the source address | |
918 | */ | |
919 | neigh = __neigh_lookup(&nd_tbl, saddr, dev, | |
920 | !inc || lladdr || !dev->addr_len); | |
921 | if (neigh) | |
1ab1457c | 922 | neigh_update(neigh, lladdr, NUD_STALE, |
1da177e4 LT |
923 | NEIGH_UPDATE_F_WEAK_OVERRIDE| |
924 | NEIGH_UPDATE_F_OVERRIDE); | |
925 | if (neigh || !dev->hard_header) { | |
926 | ndisc_send_na(dev, neigh, saddr, &msg->target, | |
62dd9318 | 927 | is_router, |
1da177e4 LT |
928 | 1, (ifp != NULL && inc), inc); |
929 | if (neigh) | |
930 | neigh_release(neigh); | |
931 | } | |
932 | ||
933 | out: | |
934 | if (ifp) | |
935 | in6_ifa_put(ifp); | |
936 | else | |
937 | in6_dev_put(idev); | |
938 | ||
939 | return; | |
940 | } | |
941 | ||
942 | static void ndisc_recv_na(struct sk_buff *skb) | |
943 | { | |
9c70220b | 944 | struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb); |
0660e03f ACM |
945 | struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; |
946 | struct in6_addr *daddr = &ipv6_hdr(skb)->daddr; | |
1da177e4 LT |
947 | u8 *lladdr = NULL; |
948 | u32 ndoptlen = skb->tail - msg->opt; | |
949 | struct ndisc_options ndopts; | |
950 | struct net_device *dev = skb->dev; | |
951 | struct inet6_ifaddr *ifp; | |
952 | struct neighbour *neigh; | |
953 | ||
954 | if (skb->len < sizeof(struct nd_msg)) { | |
955 | ND_PRINTK2(KERN_WARNING | |
956 | "ICMPv6 NA: packet too short\n"); | |
957 | return; | |
958 | } | |
959 | ||
960 | if (ipv6_addr_is_multicast(&msg->target)) { | |
961 | ND_PRINTK2(KERN_WARNING | |
962 | "ICMPv6 NA: target address is multicast.\n"); | |
963 | return; | |
964 | } | |
965 | ||
966 | if (ipv6_addr_is_multicast(daddr) && | |
967 | msg->icmph.icmp6_solicited) { | |
968 | ND_PRINTK2(KERN_WARNING | |
969 | "ICMPv6 NA: solicited NA is multicasted.\n"); | |
970 | return; | |
971 | } | |
1ab1457c | 972 | |
1da177e4 LT |
973 | if (!ndisc_parse_options(msg->opt, ndoptlen, &ndopts)) { |
974 | ND_PRINTK2(KERN_WARNING | |
975 | "ICMPv6 NS: invalid ND option\n"); | |
976 | return; | |
977 | } | |
978 | if (ndopts.nd_opts_tgt_lladdr) { | |
979 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, dev); | |
980 | if (!lladdr) { | |
981 | ND_PRINTK2(KERN_WARNING | |
982 | "ICMPv6 NA: invalid link-layer address length\n"); | |
983 | return; | |
984 | } | |
985 | } | |
986 | if ((ifp = ipv6_get_ifaddr(&msg->target, dev, 1))) { | |
987 | if (ifp->flags & IFA_F_TENTATIVE) { | |
988 | addrconf_dad_failure(ifp); | |
989 | return; | |
990 | } | |
991 | /* What should we make now? The advertisement | |
992 | is invalid, but ndisc specs say nothing | |
993 | about it. It could be misconfiguration, or | |
994 | an smart proxy agent tries to help us :-) | |
995 | */ | |
996 | ND_PRINTK1(KERN_WARNING | |
997 | "ICMPv6 NA: someone advertises our address on %s!\n", | |
998 | ifp->idev->dev->name); | |
999 | in6_ifa_put(ifp); | |
1000 | return; | |
1001 | } | |
1002 | neigh = neigh_lookup(&nd_tbl, &msg->target, dev); | |
1003 | ||
1004 | if (neigh) { | |
1005 | u8 old_flags = neigh->flags; | |
1006 | ||
1007 | if (neigh->nud_state & NUD_FAILED) | |
1008 | goto out; | |
1009 | ||
5f3e6e9e VN |
1010 | /* |
1011 | * Don't update the neighbor cache entry on a proxy NA from | |
1012 | * ourselves because either the proxied node is off link or it | |
1013 | * has already sent a NA to us. | |
1014 | */ | |
1015 | if (lladdr && !memcmp(lladdr, dev->dev_addr, dev->addr_len) && | |
fbea49e1 YH |
1016 | ipv6_devconf.forwarding && ipv6_devconf.proxy_ndp && |
1017 | pneigh_lookup(&nd_tbl, &msg->target, dev, 0)) { | |
1018 | /* XXX: idev->cnf.prixy_ndp */ | |
5f3e6e9e | 1019 | goto out; |
fbea49e1 | 1020 | } |
5f3e6e9e | 1021 | |
1da177e4 LT |
1022 | neigh_update(neigh, lladdr, |
1023 | msg->icmph.icmp6_solicited ? NUD_REACHABLE : NUD_STALE, | |
1024 | NEIGH_UPDATE_F_WEAK_OVERRIDE| | |
1025 | (msg->icmph.icmp6_override ? NEIGH_UPDATE_F_OVERRIDE : 0)| | |
1026 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
1027 | (msg->icmph.icmp6_router ? NEIGH_UPDATE_F_ISROUTER : 0)); | |
1028 | ||
1029 | if ((old_flags & ~neigh->flags) & NTF_ROUTER) { | |
1030 | /* | |
1031 | * Change: router to host | |
1032 | */ | |
1033 | struct rt6_info *rt; | |
1034 | rt = rt6_get_dflt_router(saddr, dev); | |
1035 | if (rt) | |
e0a1ad73 | 1036 | ip6_del_rt(rt); |
1da177e4 LT |
1037 | } |
1038 | ||
1039 | out: | |
1040 | neigh_release(neigh); | |
1041 | } | |
1042 | } | |
1043 | ||
1044 | static void ndisc_recv_rs(struct sk_buff *skb) | |
1045 | { | |
9c70220b | 1046 | struct rs_msg *rs_msg = (struct rs_msg *)skb_transport_header(skb); |
1da177e4 LT |
1047 | unsigned long ndoptlen = skb->len - sizeof(*rs_msg); |
1048 | struct neighbour *neigh; | |
1049 | struct inet6_dev *idev; | |
0660e03f | 1050 | struct in6_addr *saddr = &ipv6_hdr(skb)->saddr; |
1da177e4 LT |
1051 | struct ndisc_options ndopts; |
1052 | u8 *lladdr = NULL; | |
1053 | ||
1054 | if (skb->len < sizeof(*rs_msg)) | |
1055 | return; | |
1056 | ||
1057 | idev = in6_dev_get(skb->dev); | |
1058 | if (!idev) { | |
1059 | if (net_ratelimit()) | |
1060 | ND_PRINTK1("ICMP6 RS: can't find in6 device\n"); | |
1061 | return; | |
1062 | } | |
1063 | ||
1064 | /* Don't accept RS if we're not in router mode */ | |
1065 | if (!idev->cnf.forwarding) | |
1066 | goto out; | |
1067 | ||
1068 | /* | |
1069 | * Don't update NCE if src = ::; | |
1070 | * this implies that the source node has no ip address assigned yet. | |
1071 | */ | |
1072 | if (ipv6_addr_any(saddr)) | |
1073 | goto out; | |
1074 | ||
1075 | /* Parse ND options */ | |
1076 | if (!ndisc_parse_options(rs_msg->opt, ndoptlen, &ndopts)) { | |
1077 | if (net_ratelimit()) | |
1078 | ND_PRINTK2("ICMP6 NS: invalid ND option, ignored\n"); | |
1079 | goto out; | |
1080 | } | |
1081 | ||
1082 | if (ndopts.nd_opts_src_lladdr) { | |
1083 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, | |
1084 | skb->dev); | |
1085 | if (!lladdr) | |
1086 | goto out; | |
1087 | } | |
1088 | ||
1089 | neigh = __neigh_lookup(&nd_tbl, saddr, skb->dev, 1); | |
1090 | if (neigh) { | |
1091 | neigh_update(neigh, lladdr, NUD_STALE, | |
1092 | NEIGH_UPDATE_F_WEAK_OVERRIDE| | |
1093 | NEIGH_UPDATE_F_OVERRIDE| | |
1094 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER); | |
1095 | neigh_release(neigh); | |
1096 | } | |
1097 | out: | |
1098 | in6_dev_put(idev); | |
1099 | } | |
1100 | ||
1101 | static void ndisc_router_discovery(struct sk_buff *skb) | |
1102 | { | |
9c70220b | 1103 | struct ra_msg *ra_msg = (struct ra_msg *)skb_transport_header(skb); |
1da177e4 LT |
1104 | struct neighbour *neigh = NULL; |
1105 | struct inet6_dev *in6_dev; | |
65f5c7c1 | 1106 | struct rt6_info *rt = NULL; |
1da177e4 LT |
1107 | int lifetime; |
1108 | struct ndisc_options ndopts; | |
1109 | int optlen; | |
ebacaaa0 | 1110 | unsigned int pref = 0; |
1da177e4 LT |
1111 | |
1112 | __u8 * opt = (__u8 *)(ra_msg + 1); | |
1113 | ||
9c70220b ACM |
1114 | optlen = (skb->tail - skb_transport_header(skb)) - |
1115 | sizeof(struct ra_msg); | |
1da177e4 | 1116 | |
0660e03f | 1117 | if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) { |
1da177e4 LT |
1118 | ND_PRINTK2(KERN_WARNING |
1119 | "ICMPv6 RA: source address is not link-local.\n"); | |
1120 | return; | |
1121 | } | |
1122 | if (optlen < 0) { | |
1ab1457c | 1123 | ND_PRINTK2(KERN_WARNING |
1da177e4 LT |
1124 | "ICMPv6 RA: packet too short\n"); |
1125 | return; | |
1126 | } | |
1127 | ||
1128 | /* | |
1129 | * set the RA_RECV flag in the interface | |
1130 | */ | |
1131 | ||
1132 | in6_dev = in6_dev_get(skb->dev); | |
1133 | if (in6_dev == NULL) { | |
1134 | ND_PRINTK0(KERN_ERR | |
1135 | "ICMPv6 RA: can't find inet6 device for %s.\n", | |
1136 | skb->dev->name); | |
1137 | return; | |
1138 | } | |
1139 | if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_ra) { | |
1140 | in6_dev_put(in6_dev); | |
1141 | return; | |
1142 | } | |
1143 | ||
1144 | if (!ndisc_parse_options(opt, optlen, &ndopts)) { | |
1145 | in6_dev_put(in6_dev); | |
1146 | ND_PRINTK2(KERN_WARNING | |
1147 | "ICMP6 RA: invalid ND options\n"); | |
1148 | return; | |
1149 | } | |
1150 | ||
1151 | if (in6_dev->if_flags & IF_RS_SENT) { | |
1152 | /* | |
1153 | * flag that an RA was received after an RS was sent | |
1154 | * out on this interface. | |
1155 | */ | |
1156 | in6_dev->if_flags |= IF_RA_RCVD; | |
1157 | } | |
1158 | ||
1159 | /* | |
1160 | * Remember the managed/otherconf flags from most recently | |
1161 | * received RA message (RFC 2462) -- yoshfuji | |
1162 | */ | |
1163 | in6_dev->if_flags = (in6_dev->if_flags & ~(IF_RA_MANAGED | | |
1164 | IF_RA_OTHERCONF)) | | |
1165 | (ra_msg->icmph.icmp6_addrconf_managed ? | |
1166 | IF_RA_MANAGED : 0) | | |
1167 | (ra_msg->icmph.icmp6_addrconf_other ? | |
1168 | IF_RA_OTHERCONF : 0); | |
1169 | ||
65f5c7c1 YH |
1170 | if (!in6_dev->cnf.accept_ra_defrtr) |
1171 | goto skip_defrtr; | |
1172 | ||
1da177e4 LT |
1173 | lifetime = ntohs(ra_msg->icmph.icmp6_rt_lifetime); |
1174 | ||
ebacaaa0 YH |
1175 | #ifdef CONFIG_IPV6_ROUTER_PREF |
1176 | pref = ra_msg->icmph.icmp6_router_pref; | |
1177 | /* 10b is handled as if it were 00b (medium) */ | |
930d6ff2 YH |
1178 | if (pref == ICMPV6_ROUTER_PREF_INVALID || |
1179 | in6_dev->cnf.accept_ra_rtr_pref) | |
ebacaaa0 YH |
1180 | pref = ICMPV6_ROUTER_PREF_MEDIUM; |
1181 | #endif | |
1182 | ||
0660e03f | 1183 | rt = rt6_get_dflt_router(&ipv6_hdr(skb)->saddr, skb->dev); |
1da177e4 LT |
1184 | |
1185 | if (rt) | |
1186 | neigh = rt->rt6i_nexthop; | |
1187 | ||
1188 | if (rt && lifetime == 0) { | |
1189 | neigh_clone(neigh); | |
e0a1ad73 | 1190 | ip6_del_rt(rt); |
1da177e4 LT |
1191 | rt = NULL; |
1192 | } | |
1193 | ||
1194 | if (rt == NULL && lifetime) { | |
1195 | ND_PRINTK3(KERN_DEBUG | |
1196 | "ICMPv6 RA: adding default router.\n"); | |
1197 | ||
0660e03f | 1198 | rt = rt6_add_dflt_router(&ipv6_hdr(skb)->saddr, skb->dev, pref); |
1da177e4 LT |
1199 | if (rt == NULL) { |
1200 | ND_PRINTK0(KERN_ERR | |
1201 | "ICMPv6 RA: %s() failed to add default route.\n", | |
1202 | __FUNCTION__); | |
1203 | in6_dev_put(in6_dev); | |
1204 | return; | |
1205 | } | |
1206 | ||
1207 | neigh = rt->rt6i_nexthop; | |
1208 | if (neigh == NULL) { | |
1209 | ND_PRINTK0(KERN_ERR | |
1210 | "ICMPv6 RA: %s() got default router without neighbour.\n", | |
1211 | __FUNCTION__); | |
1212 | dst_release(&rt->u.dst); | |
1213 | in6_dev_put(in6_dev); | |
1214 | return; | |
1215 | } | |
1216 | neigh->flags |= NTF_ROUTER; | |
ebacaaa0 YH |
1217 | } else if (rt) { |
1218 | rt->rt6i_flags |= (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref); | |
1da177e4 LT |
1219 | } |
1220 | ||
1221 | if (rt) | |
1222 | rt->rt6i_expires = jiffies + (HZ * lifetime); | |
1223 | ||
1224 | if (ra_msg->icmph.icmp6_hop_limit) { | |
1225 | in6_dev->cnf.hop_limit = ra_msg->icmph.icmp6_hop_limit; | |
1226 | if (rt) | |
1227 | rt->u.dst.metrics[RTAX_HOPLIMIT-1] = ra_msg->icmph.icmp6_hop_limit; | |
1228 | } | |
1229 | ||
65f5c7c1 YH |
1230 | skip_defrtr: |
1231 | ||
1da177e4 LT |
1232 | /* |
1233 | * Update Reachable Time and Retrans Timer | |
1234 | */ | |
1235 | ||
1236 | if (in6_dev->nd_parms) { | |
1237 | unsigned long rtime = ntohl(ra_msg->retrans_timer); | |
1238 | ||
1239 | if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/HZ) { | |
1240 | rtime = (rtime*HZ)/1000; | |
1241 | if (rtime < HZ/10) | |
1242 | rtime = HZ/10; | |
1243 | in6_dev->nd_parms->retrans_time = rtime; | |
1244 | in6_dev->tstamp = jiffies; | |
1245 | inet6_ifinfo_notify(RTM_NEWLINK, in6_dev); | |
1246 | } | |
1247 | ||
1248 | rtime = ntohl(ra_msg->reachable_time); | |
1249 | if (rtime && rtime/1000 < MAX_SCHEDULE_TIMEOUT/(3*HZ)) { | |
1250 | rtime = (rtime*HZ)/1000; | |
1251 | ||
1252 | if (rtime < HZ/10) | |
1253 | rtime = HZ/10; | |
1254 | ||
1255 | if (rtime != in6_dev->nd_parms->base_reachable_time) { | |
1256 | in6_dev->nd_parms->base_reachable_time = rtime; | |
1257 | in6_dev->nd_parms->gc_staletime = 3 * rtime; | |
1258 | in6_dev->nd_parms->reachable_time = neigh_rand_reach_time(rtime); | |
1259 | in6_dev->tstamp = jiffies; | |
1260 | inet6_ifinfo_notify(RTM_NEWLINK, in6_dev); | |
1261 | } | |
1262 | } | |
1263 | } | |
1264 | ||
1265 | /* | |
1266 | * Process options. | |
1267 | */ | |
1268 | ||
1269 | if (!neigh) | |
0660e03f | 1270 | neigh = __neigh_lookup(&nd_tbl, &ipv6_hdr(skb)->saddr, |
1da177e4 LT |
1271 | skb->dev, 1); |
1272 | if (neigh) { | |
1273 | u8 *lladdr = NULL; | |
1274 | if (ndopts.nd_opts_src_lladdr) { | |
1275 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_src_lladdr, | |
1276 | skb->dev); | |
1277 | if (!lladdr) { | |
1278 | ND_PRINTK2(KERN_WARNING | |
1279 | "ICMPv6 RA: invalid link-layer address length\n"); | |
1280 | goto out; | |
1281 | } | |
1282 | } | |
1283 | neigh_update(neigh, lladdr, NUD_STALE, | |
1284 | NEIGH_UPDATE_F_WEAK_OVERRIDE| | |
1285 | NEIGH_UPDATE_F_OVERRIDE| | |
1286 | NEIGH_UPDATE_F_OVERRIDE_ISROUTER| | |
1287 | NEIGH_UPDATE_F_ISROUTER); | |
1288 | } | |
1289 | ||
70ceb4f5 | 1290 | #ifdef CONFIG_IPV6_ROUTE_INFO |
09c884d4 | 1291 | if (in6_dev->cnf.accept_ra_rtr_pref && ndopts.nd_opts_ri) { |
70ceb4f5 YH |
1292 | struct nd_opt_hdr *p; |
1293 | for (p = ndopts.nd_opts_ri; | |
1294 | p; | |
1295 | p = ndisc_next_option(p, ndopts.nd_opts_ri_end)) { | |
09c884d4 YH |
1296 | if (((struct route_info *)p)->prefix_len > in6_dev->cnf.accept_ra_rt_info_max_plen) |
1297 | continue; | |
70ceb4f5 | 1298 | rt6_route_rcv(skb->dev, (u8*)p, (p->nd_opt_len) << 3, |
0660e03f | 1299 | &ipv6_hdr(skb)->saddr); |
70ceb4f5 YH |
1300 | } |
1301 | } | |
1302 | #endif | |
1303 | ||
c4fd30eb | 1304 | if (in6_dev->cnf.accept_ra_pinfo && ndopts.nd_opts_pi) { |
1da177e4 LT |
1305 | struct nd_opt_hdr *p; |
1306 | for (p = ndopts.nd_opts_pi; | |
1307 | p; | |
1308 | p = ndisc_next_option(p, ndopts.nd_opts_pi_end)) { | |
1309 | addrconf_prefix_rcv(skb->dev, (u8*)p, (p->nd_opt_len) << 3); | |
1310 | } | |
1311 | } | |
1312 | ||
1313 | if (ndopts.nd_opts_mtu) { | |
e69a4adc | 1314 | __be32 n; |
1da177e4 LT |
1315 | u32 mtu; |
1316 | ||
e69a4adc AV |
1317 | memcpy(&n, ((u8*)(ndopts.nd_opts_mtu+1))+2, sizeof(mtu)); |
1318 | mtu = ntohl(n); | |
1da177e4 LT |
1319 | |
1320 | if (mtu < IPV6_MIN_MTU || mtu > skb->dev->mtu) { | |
1321 | ND_PRINTK2(KERN_WARNING | |
1322 | "ICMPv6 RA: invalid mtu: %d\n", | |
1323 | mtu); | |
1324 | } else if (in6_dev->cnf.mtu6 != mtu) { | |
1325 | in6_dev->cnf.mtu6 = mtu; | |
1326 | ||
1327 | if (rt) | |
1328 | rt->u.dst.metrics[RTAX_MTU-1] = mtu; | |
1329 | ||
1330 | rt6_mtu_change(skb->dev, mtu); | |
1331 | } | |
1332 | } | |
1ab1457c | 1333 | |
1da177e4 LT |
1334 | if (ndopts.nd_opts_tgt_lladdr || ndopts.nd_opts_rh) { |
1335 | ND_PRINTK2(KERN_WARNING | |
1336 | "ICMPv6 RA: invalid RA options"); | |
1337 | } | |
1338 | out: | |
1339 | if (rt) | |
1340 | dst_release(&rt->u.dst); | |
1341 | else if (neigh) | |
1342 | neigh_release(neigh); | |
1343 | in6_dev_put(in6_dev); | |
1344 | } | |
1345 | ||
1346 | static void ndisc_redirect_rcv(struct sk_buff *skb) | |
1347 | { | |
1348 | struct inet6_dev *in6_dev; | |
1349 | struct icmp6hdr *icmph; | |
1350 | struct in6_addr *dest; | |
1351 | struct in6_addr *target; /* new first hop to destination */ | |
1352 | struct neighbour *neigh; | |
1353 | int on_link = 0; | |
1354 | struct ndisc_options ndopts; | |
1355 | int optlen; | |
1356 | u8 *lladdr = NULL; | |
1357 | ||
0660e03f | 1358 | if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) { |
1da177e4 LT |
1359 | ND_PRINTK2(KERN_WARNING |
1360 | "ICMPv6 Redirect: source address is not link-local.\n"); | |
1361 | return; | |
1362 | } | |
1363 | ||
9c70220b | 1364 | optlen = skb->tail - skb_transport_header(skb); |
1da177e4 LT |
1365 | optlen -= sizeof(struct icmp6hdr) + 2 * sizeof(struct in6_addr); |
1366 | ||
1367 | if (optlen < 0) { | |
1368 | ND_PRINTK2(KERN_WARNING | |
1369 | "ICMPv6 Redirect: packet too short\n"); | |
1370 | return; | |
1371 | } | |
1372 | ||
cc70ab26 | 1373 | icmph = icmp6_hdr(skb); |
1da177e4 LT |
1374 | target = (struct in6_addr *) (icmph + 1); |
1375 | dest = target + 1; | |
1376 | ||
1377 | if (ipv6_addr_is_multicast(dest)) { | |
1378 | ND_PRINTK2(KERN_WARNING | |
1379 | "ICMPv6 Redirect: destination address is multicast.\n"); | |
1380 | return; | |
1381 | } | |
1382 | ||
1383 | if (ipv6_addr_equal(dest, target)) { | |
1384 | on_link = 1; | |
1385 | } else if (!(ipv6_addr_type(target) & IPV6_ADDR_LINKLOCAL)) { | |
1ab1457c | 1386 | ND_PRINTK2(KERN_WARNING |
1da177e4 LT |
1387 | "ICMPv6 Redirect: target address is not link-local.\n"); |
1388 | return; | |
1389 | } | |
1390 | ||
1391 | in6_dev = in6_dev_get(skb->dev); | |
1392 | if (!in6_dev) | |
1393 | return; | |
1394 | if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects) { | |
1395 | in6_dev_put(in6_dev); | |
1396 | return; | |
1397 | } | |
1398 | ||
1ab1457c | 1399 | /* RFC2461 8.1: |
1da177e4 LT |
1400 | * The IP source address of the Redirect MUST be the same as the current |
1401 | * first-hop router for the specified ICMP Destination Address. | |
1402 | */ | |
1ab1457c | 1403 | |
1da177e4 LT |
1404 | if (!ndisc_parse_options((u8*)(dest + 1), optlen, &ndopts)) { |
1405 | ND_PRINTK2(KERN_WARNING | |
1406 | "ICMPv6 Redirect: invalid ND options\n"); | |
1407 | in6_dev_put(in6_dev); | |
1408 | return; | |
1409 | } | |
1410 | if (ndopts.nd_opts_tgt_lladdr) { | |
1411 | lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, | |
1412 | skb->dev); | |
1413 | if (!lladdr) { | |
1414 | ND_PRINTK2(KERN_WARNING | |
1415 | "ICMPv6 Redirect: invalid link-layer address length\n"); | |
1416 | in6_dev_put(in6_dev); | |
1417 | return; | |
1418 | } | |
1419 | } | |
1420 | ||
1421 | neigh = __neigh_lookup(&nd_tbl, target, skb->dev, 1); | |
1422 | if (neigh) { | |
0660e03f ACM |
1423 | rt6_redirect(dest, &ipv6_hdr(skb)->daddr, |
1424 | &ipv6_hdr(skb)->saddr, neigh, lladdr, | |
1da177e4 LT |
1425 | on_link); |
1426 | neigh_release(neigh); | |
1427 | } | |
1428 | in6_dev_put(in6_dev); | |
1429 | } | |
1430 | ||
1431 | void ndisc_send_redirect(struct sk_buff *skb, struct neighbour *neigh, | |
1432 | struct in6_addr *target) | |
1433 | { | |
1434 | struct sock *sk = ndisc_socket->sk; | |
1435 | int len = sizeof(struct icmp6hdr) + 2 * sizeof(struct in6_addr); | |
1436 | struct sk_buff *buff; | |
1437 | struct icmp6hdr *icmph; | |
1438 | struct in6_addr saddr_buf; | |
1439 | struct in6_addr *addrp; | |
1440 | struct net_device *dev; | |
1441 | struct rt6_info *rt; | |
1442 | struct dst_entry *dst; | |
1443 | struct inet6_dev *idev; | |
1444 | struct flowi fl; | |
1445 | u8 *opt; | |
1446 | int rd_len; | |
1447 | int err; | |
1448 | int hlen; | |
1449 | u8 ha_buf[MAX_ADDR_LEN], *ha = NULL; | |
1450 | ||
1451 | dev = skb->dev; | |
1452 | ||
95c385b4 | 1453 | if (ipv6_get_lladdr(dev, &saddr_buf, IFA_F_TENTATIVE)) { |
1da177e4 LT |
1454 | ND_PRINTK2(KERN_WARNING |
1455 | "ICMPv6 Redirect: no link-local address on %s\n", | |
1456 | dev->name); | |
1ab1457c YH |
1457 | return; |
1458 | } | |
1da177e4 | 1459 | |
0660e03f | 1460 | if (!ipv6_addr_equal(&ipv6_hdr(skb)->daddr, target) && |
29556526 LY |
1461 | !(ipv6_addr_type(target) & IPV6_ADDR_LINKLOCAL)) { |
1462 | ND_PRINTK2(KERN_WARNING | |
1463 | "ICMPv6 Redirect: target address is not link-local.\n"); | |
1464 | return; | |
1465 | } | |
1466 | ||
0660e03f | 1467 | ndisc_flow_init(&fl, NDISC_REDIRECT, &saddr_buf, &ipv6_hdr(skb)->saddr, |
af184765 | 1468 | dev->ifindex); |
1da177e4 LT |
1469 | |
1470 | dst = ip6_route_output(NULL, &fl); | |
1471 | if (dst == NULL) | |
1472 | return; | |
1473 | ||
1474 | err = xfrm_lookup(&dst, &fl, NULL, 0); | |
e104411b | 1475 | if (err) |
1da177e4 | 1476 | return; |
1da177e4 LT |
1477 | |
1478 | rt = (struct rt6_info *) dst; | |
1479 | ||
1480 | if (rt->rt6i_flags & RTF_GATEWAY) { | |
1481 | ND_PRINTK2(KERN_WARNING | |
1482 | "ICMPv6 Redirect: destination is not a neighbour.\n"); | |
1483 | dst_release(dst); | |
1484 | return; | |
1485 | } | |
1486 | if (!xrlim_allow(dst, 1*HZ)) { | |
1487 | dst_release(dst); | |
1488 | return; | |
1489 | } | |
1490 | ||
1491 | if (dev->addr_len) { | |
1492 | read_lock_bh(&neigh->lock); | |
1493 | if (neigh->nud_state & NUD_VALID) { | |
1494 | memcpy(ha_buf, neigh->ha, dev->addr_len); | |
1495 | read_unlock_bh(&neigh->lock); | |
1496 | ha = ha_buf; | |
1497 | len += ndisc_opt_addr_space(dev); | |
1498 | } else | |
1499 | read_unlock_bh(&neigh->lock); | |
1500 | } | |
1501 | ||
1502 | rd_len = min_t(unsigned int, | |
1503 | IPV6_MIN_MTU-sizeof(struct ipv6hdr)-len, skb->len + 8); | |
1504 | rd_len &= ~0x7; | |
1505 | len += rd_len; | |
1506 | ||
d54a81d3 DM |
1507 | buff = sock_alloc_send_skb(sk, |
1508 | (MAX_HEADER + sizeof(struct ipv6hdr) + | |
1509 | len + LL_RESERVED_SPACE(dev)), | |
1da177e4 LT |
1510 | 1, &err); |
1511 | if (buff == NULL) { | |
1512 | ND_PRINTK0(KERN_ERR | |
1513 | "ICMPv6 Redirect: %s() failed to allocate an skb.\n", | |
1514 | __FUNCTION__); | |
1515 | dst_release(dst); | |
1516 | return; | |
1517 | } | |
1518 | ||
1519 | hlen = 0; | |
1520 | ||
1521 | skb_reserve(buff, LL_RESERVED_SPACE(dev)); | |
0660e03f | 1522 | ip6_nd_hdr(sk, buff, dev, &saddr_buf, &ipv6_hdr(skb)->saddr, |
1da177e4 LT |
1523 | IPPROTO_ICMPV6, len); |
1524 | ||
d10ba34b ACM |
1525 | skb_set_transport_header(buff, buff->tail - buff->data); |
1526 | skb_put(buff, len); | |
1527 | icmph = icmp6_hdr(buff); | |
1da177e4 LT |
1528 | |
1529 | memset(icmph, 0, sizeof(struct icmp6hdr)); | |
1530 | icmph->icmp6_type = NDISC_REDIRECT; | |
1531 | ||
1532 | /* | |
1533 | * copy target and destination addresses | |
1534 | */ | |
1535 | ||
1536 | addrp = (struct in6_addr *)(icmph + 1); | |
1537 | ipv6_addr_copy(addrp, target); | |
1538 | addrp++; | |
0660e03f | 1539 | ipv6_addr_copy(addrp, &ipv6_hdr(skb)->daddr); |
1da177e4 LT |
1540 | |
1541 | opt = (u8*) (addrp + 1); | |
1542 | ||
1543 | /* | |
1544 | * include target_address option | |
1545 | */ | |
1546 | ||
1547 | if (ha) | |
1548 | opt = ndisc_fill_addr_option(opt, ND_OPT_TARGET_LL_ADDR, ha, | |
1549 | dev->addr_len, dev->type); | |
1550 | ||
1551 | /* | |
1552 | * build redirect option and copy skb over to the new packet. | |
1553 | */ | |
1554 | ||
1ab1457c | 1555 | memset(opt, 0, 8); |
1da177e4 LT |
1556 | *(opt++) = ND_OPT_REDIRECT_HDR; |
1557 | *(opt++) = (rd_len >> 3); | |
1558 | opt += 6; | |
1559 | ||
0660e03f | 1560 | memcpy(opt, ipv6_hdr(skb), rd_len - 8); |
1da177e4 | 1561 | |
0660e03f | 1562 | icmph->icmp6_cksum = csum_ipv6_magic(&saddr_buf, &ipv6_hdr(skb)->saddr, |
1da177e4 LT |
1563 | len, IPPROTO_ICMPV6, |
1564 | csum_partial((u8 *) icmph, len, 0)); | |
1565 | ||
1566 | buff->dst = dst; | |
1567 | idev = in6_dev_get(dst->dev); | |
a11d206d | 1568 | IP6_INC_STATS(idev, IPSTATS_MIB_OUTREQUESTS); |
1da177e4 LT |
1569 | err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, buff, NULL, dst->dev, dst_output); |
1570 | if (!err) { | |
1571 | ICMP6_INC_STATS(idev, ICMP6_MIB_OUTREDIRECTS); | |
1572 | ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS); | |
1573 | } | |
1574 | ||
1575 | if (likely(idev != NULL)) | |
1576 | in6_dev_put(idev); | |
1577 | } | |
1578 | ||
1579 | static void pndisc_redo(struct sk_buff *skb) | |
1580 | { | |
140e26fc | 1581 | ndisc_recv_ns(skb); |
1da177e4 LT |
1582 | kfree_skb(skb); |
1583 | } | |
1584 | ||
1585 | int ndisc_rcv(struct sk_buff *skb) | |
1586 | { | |
1587 | struct nd_msg *msg; | |
1588 | ||
1589 | if (!pskb_may_pull(skb, skb->len)) | |
1590 | return 0; | |
1591 | ||
9c70220b | 1592 | msg = (struct nd_msg *)skb_transport_header(skb); |
1da177e4 | 1593 | |
9c70220b | 1594 | __skb_push(skb, skb->data - skb_transport_header(skb)); |
1da177e4 | 1595 | |
0660e03f | 1596 | if (ipv6_hdr(skb)->hop_limit != 255) { |
1da177e4 LT |
1597 | ND_PRINTK2(KERN_WARNING |
1598 | "ICMPv6 NDISC: invalid hop-limit: %d\n", | |
0660e03f | 1599 | ipv6_hdr(skb)->hop_limit); |
1da177e4 LT |
1600 | return 0; |
1601 | } | |
1602 | ||
1603 | if (msg->icmph.icmp6_code != 0) { | |
1ab1457c | 1604 | ND_PRINTK2(KERN_WARNING |
1da177e4 LT |
1605 | "ICMPv6 NDISC: invalid ICMPv6 code: %d\n", |
1606 | msg->icmph.icmp6_code); | |
1607 | return 0; | |
1608 | } | |
1609 | ||
a61bbcf2 PM |
1610 | memset(NEIGH_CB(skb), 0, sizeof(struct neighbour_cb)); |
1611 | ||
1da177e4 LT |
1612 | switch (msg->icmph.icmp6_type) { |
1613 | case NDISC_NEIGHBOUR_SOLICITATION: | |
1614 | ndisc_recv_ns(skb); | |
1615 | break; | |
1616 | ||
1617 | case NDISC_NEIGHBOUR_ADVERTISEMENT: | |
1618 | ndisc_recv_na(skb); | |
1619 | break; | |
1620 | ||
1621 | case NDISC_ROUTER_SOLICITATION: | |
1622 | ndisc_recv_rs(skb); | |
1623 | break; | |
1624 | ||
1625 | case NDISC_ROUTER_ADVERTISEMENT: | |
1626 | ndisc_router_discovery(skb); | |
1627 | break; | |
1628 | ||
1629 | case NDISC_REDIRECT: | |
1630 | ndisc_redirect_rcv(skb); | |
1631 | break; | |
1632 | }; | |
1633 | ||
1634 | return 0; | |
1635 | } | |
1636 | ||
1637 | static int ndisc_netdev_event(struct notifier_block *this, unsigned long event, void *ptr) | |
1638 | { | |
1639 | struct net_device *dev = ptr; | |
1640 | ||
1641 | switch (event) { | |
1642 | case NETDEV_CHANGEADDR: | |
1643 | neigh_changeaddr(&nd_tbl, dev); | |
1644 | fib6_run_gc(~0UL); | |
1645 | break; | |
1646 | case NETDEV_DOWN: | |
1647 | neigh_ifdown(&nd_tbl, dev); | |
1648 | fib6_run_gc(~0UL); | |
1649 | break; | |
1650 | default: | |
1651 | break; | |
1652 | } | |
1653 | ||
1654 | return NOTIFY_DONE; | |
1655 | } | |
1656 | ||
1657 | static struct notifier_block ndisc_netdev_notifier = { | |
1658 | .notifier_call = ndisc_netdev_event, | |
1659 | }; | |
1660 | ||
1661 | #ifdef CONFIG_SYSCTL | |
1662 | static void ndisc_warn_deprecated_sysctl(struct ctl_table *ctl, | |
1663 | const char *func, const char *dev_name) | |
1664 | { | |
1665 | static char warncomm[TASK_COMM_LEN]; | |
1666 | static int warned; | |
1667 | if (strcmp(warncomm, current->comm) && warned < 5) { | |
1668 | strcpy(warncomm, current->comm); | |
1669 | printk(KERN_WARNING | |
1670 | "process `%s' is using deprecated sysctl (%s) " | |
1671 | "net.ipv6.neigh.%s.%s; " | |
1672 | "Use net.ipv6.neigh.%s.%s_ms " | |
1673 | "instead.\n", | |
1674 | warncomm, func, | |
1675 | dev_name, ctl->procname, | |
1676 | dev_name, ctl->procname); | |
1677 | warned++; | |
1678 | } | |
1679 | } | |
1680 | ||
1681 | int ndisc_ifinfo_sysctl_change(struct ctl_table *ctl, int write, struct file * filp, void __user *buffer, size_t *lenp, loff_t *ppos) | |
1682 | { | |
1683 | struct net_device *dev = ctl->extra1; | |
1684 | struct inet6_dev *idev; | |
1685 | int ret; | |
1686 | ||
1687 | if (ctl->ctl_name == NET_NEIGH_RETRANS_TIME || | |
1688 | ctl->ctl_name == NET_NEIGH_REACHABLE_TIME) | |
1689 | ndisc_warn_deprecated_sysctl(ctl, "syscall", dev ? dev->name : "default"); | |
1690 | ||
1691 | switch (ctl->ctl_name) { | |
1692 | case NET_NEIGH_RETRANS_TIME: | |
1693 | ret = proc_dointvec(ctl, write, filp, buffer, lenp, ppos); | |
1694 | break; | |
1695 | case NET_NEIGH_REACHABLE_TIME: | |
1696 | ret = proc_dointvec_jiffies(ctl, write, | |
1697 | filp, buffer, lenp, ppos); | |
1698 | break; | |
1699 | case NET_NEIGH_RETRANS_TIME_MS: | |
1700 | case NET_NEIGH_REACHABLE_TIME_MS: | |
1701 | ret = proc_dointvec_ms_jiffies(ctl, write, | |
1702 | filp, buffer, lenp, ppos); | |
1703 | break; | |
1704 | default: | |
1705 | ret = -1; | |
1706 | } | |
1707 | ||
1708 | if (write && ret == 0 && dev && (idev = in6_dev_get(dev)) != NULL) { | |
1709 | if (ctl->ctl_name == NET_NEIGH_REACHABLE_TIME || | |
1710 | ctl->ctl_name == NET_NEIGH_REACHABLE_TIME_MS) | |
1711 | idev->nd_parms->reachable_time = neigh_rand_reach_time(idev->nd_parms->base_reachable_time); | |
1712 | idev->tstamp = jiffies; | |
1713 | inet6_ifinfo_notify(RTM_NEWLINK, idev); | |
1714 | in6_dev_put(idev); | |
1715 | } | |
1716 | return ret; | |
1717 | } | |
1718 | ||
1719 | static int ndisc_ifinfo_sysctl_strategy(ctl_table *ctl, int __user *name, | |
1720 | int nlen, void __user *oldval, | |
1721 | size_t __user *oldlenp, | |
1f29bcd7 | 1722 | void __user *newval, size_t newlen) |
1da177e4 LT |
1723 | { |
1724 | struct net_device *dev = ctl->extra1; | |
1725 | struct inet6_dev *idev; | |
1726 | int ret; | |
1727 | ||
1728 | if (ctl->ctl_name == NET_NEIGH_RETRANS_TIME || | |
1729 | ctl->ctl_name == NET_NEIGH_REACHABLE_TIME) | |
1730 | ndisc_warn_deprecated_sysctl(ctl, "procfs", dev ? dev->name : "default"); | |
1731 | ||
1732 | switch (ctl->ctl_name) { | |
1733 | case NET_NEIGH_REACHABLE_TIME: | |
1734 | ret = sysctl_jiffies(ctl, name, nlen, | |
1f29bcd7 | 1735 | oldval, oldlenp, newval, newlen); |
1da177e4 LT |
1736 | break; |
1737 | case NET_NEIGH_RETRANS_TIME_MS: | |
1738 | case NET_NEIGH_REACHABLE_TIME_MS: | |
1739 | ret = sysctl_ms_jiffies(ctl, name, nlen, | |
1f29bcd7 | 1740 | oldval, oldlenp, newval, newlen); |
1da177e4 LT |
1741 | break; |
1742 | default: | |
1743 | ret = 0; | |
1744 | } | |
1745 | ||
1746 | if (newval && newlen && ret > 0 && | |
1747 | dev && (idev = in6_dev_get(dev)) != NULL) { | |
1748 | if (ctl->ctl_name == NET_NEIGH_REACHABLE_TIME || | |
1749 | ctl->ctl_name == NET_NEIGH_REACHABLE_TIME_MS) | |
1750 | idev->nd_parms->reachable_time = neigh_rand_reach_time(idev->nd_parms->base_reachable_time); | |
1751 | idev->tstamp = jiffies; | |
1752 | inet6_ifinfo_notify(RTM_NEWLINK, idev); | |
1753 | in6_dev_put(idev); | |
1754 | } | |
1755 | ||
1756 | return ret; | |
1757 | } | |
1758 | ||
1759 | #endif | |
1760 | ||
1761 | int __init ndisc_init(struct net_proto_family *ops) | |
1762 | { | |
1763 | struct ipv6_pinfo *np; | |
1764 | struct sock *sk; | |
1ab1457c | 1765 | int err; |
1da177e4 LT |
1766 | |
1767 | err = sock_create_kern(PF_INET6, SOCK_RAW, IPPROTO_ICMPV6, &ndisc_socket); | |
1768 | if (err < 0) { | |
1769 | ND_PRINTK0(KERN_ERR | |
1ab1457c | 1770 | "ICMPv6 NDISC: Failed to initialize the control socket (err %d).\n", |
1da177e4 LT |
1771 | err); |
1772 | ndisc_socket = NULL; /* For safety. */ | |
1773 | return err; | |
1774 | } | |
1775 | ||
1776 | sk = ndisc_socket->sk; | |
1777 | np = inet6_sk(sk); | |
1778 | sk->sk_allocation = GFP_ATOMIC; | |
1779 | np->hop_limit = 255; | |
1780 | /* Do not loopback ndisc messages */ | |
1781 | np->mc_loop = 0; | |
1782 | sk->sk_prot->unhash(sk); | |
1783 | ||
1ab1457c YH |
1784 | /* |
1785 | * Initialize the neighbour table | |
1786 | */ | |
1787 | ||
1da177e4 LT |
1788 | neigh_table_init(&nd_tbl); |
1789 | ||
1790 | #ifdef CONFIG_SYSCTL | |
1ab1457c | 1791 | neigh_sysctl_register(NULL, &nd_tbl.parms, NET_IPV6, NET_IPV6_NEIGH, |
1da177e4 LT |
1792 | "ipv6", |
1793 | &ndisc_ifinfo_sysctl_change, | |
1794 | &ndisc_ifinfo_sysctl_strategy); | |
1795 | #endif | |
1796 | ||
1797 | register_netdevice_notifier(&ndisc_netdev_notifier); | |
1798 | return 0; | |
1799 | } | |
1800 | ||
1801 | void ndisc_cleanup(void) | |
1802 | { | |
36f73d0c | 1803 | unregister_netdevice_notifier(&ndisc_netdev_notifier); |
1da177e4 LT |
1804 | #ifdef CONFIG_SYSCTL |
1805 | neigh_sysctl_unregister(&nd_tbl.parms); | |
1806 | #endif | |
1807 | neigh_table_clear(&nd_tbl); | |
1808 | sock_release(ndisc_socket); | |
1809 | ndisc_socket = NULL; /* For safety. */ | |
1810 | } |