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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * NET3: Implementation of the ICMP protocol layer. | |
3 | * | |
4 | * Alan Cox, <alan@redhat.com> | |
5 | * | |
6 | * Version: $Id: icmp.c,v 1.85 2002/02/01 22:01:03 davem Exp $ | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU General Public License | |
10 | * as published by the Free Software Foundation; either version | |
11 | * 2 of the License, or (at your option) any later version. | |
12 | * | |
13 | * Some of the function names and the icmp unreach table for this | |
14 | * module were derived from [icmp.c 1.0.11 06/02/93] by | |
15 | * Ross Biro, Fred N. van Kempen, Mark Evans, Alan Cox, Gerhard Koerting. | |
16 | * Other than that this module is a complete rewrite. | |
17 | * | |
18 | * Fixes: | |
19 | * Clemens Fruhwirth : introduce global icmp rate limiting | |
20 | * with icmp type masking ability instead | |
21 | * of broken per type icmp timeouts. | |
22 | * Mike Shaver : RFC1122 checks. | |
23 | * Alan Cox : Multicast ping reply as self. | |
24 | * Alan Cox : Fix atomicity lockup in ip_build_xmit | |
25 | * call. | |
26 | * Alan Cox : Added 216,128 byte paths to the MTU | |
27 | * code. | |
28 | * Martin Mares : RFC1812 checks. | |
29 | * Martin Mares : Can be configured to follow redirects | |
30 | * if acting as a router _without_ a | |
31 | * routing protocol (RFC 1812). | |
32 | * Martin Mares : Echo requests may be configured to | |
33 | * be ignored (RFC 1812). | |
34 | * Martin Mares : Limitation of ICMP error message | |
35 | * transmit rate (RFC 1812). | |
36 | * Martin Mares : TOS and Precedence set correctly | |
37 | * (RFC 1812). | |
38 | * Martin Mares : Now copying as much data from the | |
39 | * original packet as we can without | |
40 | * exceeding 576 bytes (RFC 1812). | |
41 | * Willy Konynenberg : Transparent proxying support. | |
42 | * Keith Owens : RFC1191 correction for 4.2BSD based | |
43 | * path MTU bug. | |
44 | * Thomas Quinot : ICMP Dest Unreach codes up to 15 are | |
45 | * valid (RFC 1812). | |
46 | * Andi Kleen : Check all packet lengths properly | |
47 | * and moved all kfree_skb() up to | |
48 | * icmp_rcv. | |
49 | * Andi Kleen : Move the rate limit bookkeeping | |
50 | * into the dest entry and use a token | |
51 | * bucket filter (thanks to ANK). Make | |
52 | * the rates sysctl configurable. | |
53 | * Yu Tianli : Fixed two ugly bugs in icmp_send | |
54 | * - IP option length was accounted wrongly | |
55 | * - ICMP header length was not accounted | |
56 | * at all. | |
57 | * Tristan Greaves : Added sysctl option to ignore bogus | |
58 | * broadcast responses from broken routers. | |
59 | * | |
60 | * To Fix: | |
61 | * | |
62 | * - Should use skb_pull() instead of all the manual checking. | |
63 | * This would also greatly simply some upper layer error handlers. --AK | |
64 | * | |
65 | */ | |
66 | ||
1da177e4 LT |
67 | #include <linux/module.h> |
68 | #include <linux/types.h> | |
69 | #include <linux/jiffies.h> | |
70 | #include <linux/kernel.h> | |
71 | #include <linux/fcntl.h> | |
72 | #include <linux/socket.h> | |
73 | #include <linux/in.h> | |
74 | #include <linux/inet.h> | |
14c85021 | 75 | #include <linux/inetdevice.h> |
1da177e4 LT |
76 | #include <linux/netdevice.h> |
77 | #include <linux/string.h> | |
78 | #include <linux/netfilter_ipv4.h> | |
79 | #include <net/snmp.h> | |
80 | #include <net/ip.h> | |
81 | #include <net/route.h> | |
82 | #include <net/protocol.h> | |
83 | #include <net/icmp.h> | |
84 | #include <net/tcp.h> | |
85 | #include <net/udp.h> | |
86 | #include <net/raw.h> | |
87 | #include <linux/skbuff.h> | |
88 | #include <net/sock.h> | |
89 | #include <linux/errno.h> | |
90 | #include <linux/timer.h> | |
91 | #include <linux/init.h> | |
92 | #include <asm/system.h> | |
93 | #include <asm/uaccess.h> | |
94 | #include <net/checksum.h> | |
8b7817f3 | 95 | #include <net/xfrm.h> |
1da177e4 LT |
96 | |
97 | /* | |
98 | * Build xmit assembly blocks | |
99 | */ | |
100 | ||
101 | struct icmp_bxm { | |
102 | struct sk_buff *skb; | |
103 | int offset; | |
104 | int data_len; | |
105 | ||
106 | struct { | |
107 | struct icmphdr icmph; | |
b03d73e3 | 108 | __be32 times[3]; |
1da177e4 LT |
109 | } data; |
110 | int head_len; | |
111 | struct ip_options replyopts; | |
112 | unsigned char optbuf[40]; | |
113 | }; | |
114 | ||
115 | /* | |
116 | * Statistics | |
117 | */ | |
ba89966c | 118 | DEFINE_SNMP_STAT(struct icmp_mib, icmp_statistics) __read_mostly; |
96793b48 | 119 | DEFINE_SNMP_STAT(struct icmpmsg_mib, icmpmsg_statistics) __read_mostly; |
1da177e4 LT |
120 | |
121 | /* An array of errno for error messages from dest unreach. */ | |
122 | /* RFC 1122: 3.2.2.1 States that NET_UNREACH, HOST_UNREACH and SR_FAILED MUST be considered 'transient errs'. */ | |
123 | ||
124 | struct icmp_err icmp_err_convert[] = { | |
125 | { | |
126 | .errno = ENETUNREACH, /* ICMP_NET_UNREACH */ | |
127 | .fatal = 0, | |
128 | }, | |
129 | { | |
130 | .errno = EHOSTUNREACH, /* ICMP_HOST_UNREACH */ | |
131 | .fatal = 0, | |
132 | }, | |
133 | { | |
134 | .errno = ENOPROTOOPT /* ICMP_PROT_UNREACH */, | |
135 | .fatal = 1, | |
136 | }, | |
137 | { | |
138 | .errno = ECONNREFUSED, /* ICMP_PORT_UNREACH */ | |
139 | .fatal = 1, | |
140 | }, | |
141 | { | |
142 | .errno = EMSGSIZE, /* ICMP_FRAG_NEEDED */ | |
143 | .fatal = 0, | |
144 | }, | |
145 | { | |
146 | .errno = EOPNOTSUPP, /* ICMP_SR_FAILED */ | |
147 | .fatal = 0, | |
148 | }, | |
149 | { | |
150 | .errno = ENETUNREACH, /* ICMP_NET_UNKNOWN */ | |
151 | .fatal = 1, | |
152 | }, | |
153 | { | |
154 | .errno = EHOSTDOWN, /* ICMP_HOST_UNKNOWN */ | |
155 | .fatal = 1, | |
156 | }, | |
157 | { | |
158 | .errno = ENONET, /* ICMP_HOST_ISOLATED */ | |
159 | .fatal = 1, | |
160 | }, | |
161 | { | |
162 | .errno = ENETUNREACH, /* ICMP_NET_ANO */ | |
163 | .fatal = 1, | |
164 | }, | |
165 | { | |
166 | .errno = EHOSTUNREACH, /* ICMP_HOST_ANO */ | |
167 | .fatal = 1, | |
168 | }, | |
169 | { | |
170 | .errno = ENETUNREACH, /* ICMP_NET_UNR_TOS */ | |
171 | .fatal = 0, | |
172 | }, | |
173 | { | |
174 | .errno = EHOSTUNREACH, /* ICMP_HOST_UNR_TOS */ | |
175 | .fatal = 0, | |
176 | }, | |
177 | { | |
178 | .errno = EHOSTUNREACH, /* ICMP_PKT_FILTERED */ | |
179 | .fatal = 1, | |
180 | }, | |
181 | { | |
182 | .errno = EHOSTUNREACH, /* ICMP_PREC_VIOLATION */ | |
183 | .fatal = 1, | |
184 | }, | |
185 | { | |
186 | .errno = EHOSTUNREACH, /* ICMP_PREC_CUTOFF */ | |
187 | .fatal = 1, | |
188 | }, | |
189 | }; | |
190 | ||
191 | /* Control parameters for ECHO replies. */ | |
ab32ea5d BH |
192 | int sysctl_icmp_echo_ignore_all __read_mostly; |
193 | int sysctl_icmp_echo_ignore_broadcasts __read_mostly = 1; | |
1da177e4 LT |
194 | |
195 | /* Control parameter - ignore bogus broadcast responses? */ | |
ab32ea5d | 196 | int sysctl_icmp_ignore_bogus_error_responses __read_mostly = 1; |
1da177e4 LT |
197 | |
198 | /* | |
199 | * Configurable global rate limit. | |
200 | * | |
201 | * ratelimit defines tokens/packet consumed for dst->rate_token bucket | |
202 | * ratemask defines which icmp types are ratelimited by setting | |
203 | * it's bit position. | |
204 | * | |
205 | * default: | |
206 | * dest unreachable (3), source quench (4), | |
207 | * time exceeded (11), parameter problem (12) | |
208 | */ | |
209 | ||
ab32ea5d BH |
210 | int sysctl_icmp_ratelimit __read_mostly = 1 * HZ; |
211 | int sysctl_icmp_ratemask __read_mostly = 0x1818; | |
212 | int sysctl_icmp_errors_use_inbound_ifaddr __read_mostly; | |
1da177e4 LT |
213 | |
214 | /* | |
215 | * ICMP control array. This specifies what to do with each ICMP. | |
216 | */ | |
217 | ||
218 | struct icmp_control { | |
1da177e4 LT |
219 | void (*handler)(struct sk_buff *skb); |
220 | short error; /* This ICMP is classed as an error message */ | |
221 | }; | |
222 | ||
9b5b5cff | 223 | static const struct icmp_control icmp_pointers[NR_ICMP_TYPES+1]; |
1da177e4 LT |
224 | |
225 | /* | |
226 | * The ICMP socket(s). This is the most convenient way to flow control | |
227 | * our ICMP output as well as maintain a clean interface throughout | |
228 | * all layers. All Socketless IP sends will soon be gone. | |
229 | * | |
230 | * On SMP we have one ICMP socket per-cpu. | |
231 | */ | |
232 | static DEFINE_PER_CPU(struct socket *, __icmp_socket) = NULL; | |
233 | #define icmp_socket __get_cpu_var(__icmp_socket) | |
234 | ||
235 | static __inline__ int icmp_xmit_lock(void) | |
236 | { | |
237 | local_bh_disable(); | |
238 | ||
239 | if (unlikely(!spin_trylock(&icmp_socket->sk->sk_lock.slock))) { | |
240 | /* This can happen if the output path signals a | |
241 | * dst_link_failure() for an outgoing ICMP packet. | |
242 | */ | |
243 | local_bh_enable(); | |
244 | return 1; | |
245 | } | |
246 | return 0; | |
247 | } | |
248 | ||
249 | static void icmp_xmit_unlock(void) | |
250 | { | |
251 | spin_unlock_bh(&icmp_socket->sk->sk_lock.slock); | |
252 | } | |
253 | ||
254 | /* | |
255 | * Send an ICMP frame. | |
256 | */ | |
257 | ||
258 | /* | |
259 | * Check transmit rate limitation for given message. | |
260 | * The rate information is held in the destination cache now. | |
261 | * This function is generic and could be used for other purposes | |
262 | * too. It uses a Token bucket filter as suggested by Alexey Kuznetsov. | |
263 | * | |
264 | * Note that the same dst_entry fields are modified by functions in | |
265 | * route.c too, but these work for packet destinations while xrlim_allow | |
266 | * works for icmp destinations. This means the rate limiting information | |
267 | * for one "ip object" is shared - and these ICMPs are twice limited: | |
268 | * by source and by destination. | |
269 | * | |
270 | * RFC 1812: 4.3.2.8 SHOULD be able to limit error message rate | |
271 | * SHOULD allow setting of rate limits | |
272 | * | |
273 | * Shared between ICMPv4 and ICMPv6. | |
274 | */ | |
275 | #define XRLIM_BURST_FACTOR 6 | |
276 | int xrlim_allow(struct dst_entry *dst, int timeout) | |
277 | { | |
278 | unsigned long now; | |
279 | int rc = 0; | |
280 | ||
281 | now = jiffies; | |
282 | dst->rate_tokens += now - dst->rate_last; | |
283 | dst->rate_last = now; | |
284 | if (dst->rate_tokens > XRLIM_BURST_FACTOR * timeout) | |
285 | dst->rate_tokens = XRLIM_BURST_FACTOR * timeout; | |
286 | if (dst->rate_tokens >= timeout) { | |
287 | dst->rate_tokens -= timeout; | |
288 | rc = 1; | |
289 | } | |
290 | return rc; | |
291 | } | |
292 | ||
293 | static inline int icmpv4_xrlim_allow(struct rtable *rt, int type, int code) | |
294 | { | |
295 | struct dst_entry *dst = &rt->u.dst; | |
296 | int rc = 1; | |
297 | ||
298 | if (type > NR_ICMP_TYPES) | |
299 | goto out; | |
300 | ||
301 | /* Don't limit PMTU discovery. */ | |
302 | if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) | |
303 | goto out; | |
304 | ||
305 | /* No rate limit on loopback */ | |
306 | if (dst->dev && (dst->dev->flags&IFF_LOOPBACK)) | |
e905a9ed | 307 | goto out; |
1da177e4 LT |
308 | |
309 | /* Limit if icmp type is enabled in ratemask. */ | |
310 | if ((1 << type) & sysctl_icmp_ratemask) | |
311 | rc = xrlim_allow(dst, sysctl_icmp_ratelimit); | |
312 | out: | |
313 | return rc; | |
314 | } | |
315 | ||
316 | /* | |
317 | * Maintain the counters used in the SNMP statistics for outgoing ICMP | |
318 | */ | |
96793b48 | 319 | void icmp_out_count(unsigned char type) |
1da177e4 | 320 | { |
96793b48 DS |
321 | ICMPMSGOUT_INC_STATS(type); |
322 | ICMP_INC_STATS(ICMP_MIB_OUTMSGS); | |
1da177e4 LT |
323 | } |
324 | ||
325 | /* | |
326 | * Checksum each fragment, and on the first include the headers and final | |
327 | * checksum. | |
328 | */ | |
329 | static int icmp_glue_bits(void *from, char *to, int offset, int len, int odd, | |
330 | struct sk_buff *skb) | |
331 | { | |
332 | struct icmp_bxm *icmp_param = (struct icmp_bxm *)from; | |
5f92a738 | 333 | __wsum csum; |
1da177e4 LT |
334 | |
335 | csum = skb_copy_and_csum_bits(icmp_param->skb, | |
336 | icmp_param->offset + offset, | |
337 | to, len, 0); | |
338 | ||
339 | skb->csum = csum_block_add(skb->csum, csum, odd); | |
340 | if (icmp_pointers[icmp_param->data.icmph.type].error) | |
341 | nf_ct_attach(skb, icmp_param->skb); | |
342 | return 0; | |
343 | } | |
344 | ||
345 | static void icmp_push_reply(struct icmp_bxm *icmp_param, | |
346 | struct ipcm_cookie *ipc, struct rtable *rt) | |
347 | { | |
348 | struct sk_buff *skb; | |
349 | ||
cb94c62c | 350 | if (ip_append_data(icmp_socket->sk, icmp_glue_bits, icmp_param, |
e905a9ed YH |
351 | icmp_param->data_len+icmp_param->head_len, |
352 | icmp_param->head_len, | |
353 | ipc, rt, MSG_DONTWAIT) < 0) | |
cb94c62c PM |
354 | ip_flush_pending_frames(icmp_socket->sk); |
355 | else if ((skb = skb_peek(&icmp_socket->sk->sk_write_queue)) != NULL) { | |
88c7664f | 356 | struct icmphdr *icmph = icmp_hdr(skb); |
d3bc23e7 | 357 | __wsum csum = 0; |
1da177e4 LT |
358 | struct sk_buff *skb1; |
359 | ||
360 | skb_queue_walk(&icmp_socket->sk->sk_write_queue, skb1) { | |
361 | csum = csum_add(csum, skb1->csum); | |
362 | } | |
363 | csum = csum_partial_copy_nocheck((void *)&icmp_param->data, | |
364 | (char *)icmph, | |
365 | icmp_param->head_len, csum); | |
366 | icmph->checksum = csum_fold(csum); | |
367 | skb->ip_summed = CHECKSUM_NONE; | |
368 | ip_push_pending_frames(icmp_socket->sk); | |
369 | } | |
370 | } | |
371 | ||
372 | /* | |
373 | * Driving logic for building and sending ICMP messages. | |
374 | */ | |
375 | ||
376 | static void icmp_reply(struct icmp_bxm *icmp_param, struct sk_buff *skb) | |
377 | { | |
378 | struct sock *sk = icmp_socket->sk; | |
379 | struct inet_sock *inet = inet_sk(sk); | |
380 | struct ipcm_cookie ipc; | |
381 | struct rtable *rt = (struct rtable *)skb->dst; | |
3ca3c68e | 382 | __be32 daddr; |
1da177e4 LT |
383 | |
384 | if (ip_options_echo(&icmp_param->replyopts, skb)) | |
f00c401b | 385 | return; |
1da177e4 LT |
386 | |
387 | if (icmp_xmit_lock()) | |
388 | return; | |
389 | ||
390 | icmp_param->data.icmph.checksum = 0; | |
1da177e4 | 391 | |
eddc9ec5 | 392 | inet->tos = ip_hdr(skb)->tos; |
1da177e4 LT |
393 | daddr = ipc.addr = rt->rt_src; |
394 | ipc.opt = NULL; | |
395 | if (icmp_param->replyopts.optlen) { | |
396 | ipc.opt = &icmp_param->replyopts; | |
397 | if (ipc.opt->srr) | |
398 | daddr = icmp_param->replyopts.faddr; | |
399 | } | |
400 | { | |
401 | struct flowi fl = { .nl_u = { .ip4_u = | |
402 | { .daddr = daddr, | |
403 | .saddr = rt->rt_spec_dst, | |
eddc9ec5 | 404 | .tos = RT_TOS(ip_hdr(skb)->tos) } }, |
1da177e4 | 405 | .proto = IPPROTO_ICMP }; |
beb8d13b | 406 | security_skb_classify_flow(skb, &fl); |
1da177e4 LT |
407 | if (ip_route_output_key(&rt, &fl)) |
408 | goto out_unlock; | |
409 | } | |
410 | if (icmpv4_xrlim_allow(rt, icmp_param->data.icmph.type, | |
411 | icmp_param->data.icmph.code)) | |
412 | icmp_push_reply(icmp_param, &ipc, rt); | |
413 | ip_rt_put(rt); | |
414 | out_unlock: | |
415 | icmp_xmit_unlock(); | |
1da177e4 LT |
416 | } |
417 | ||
418 | ||
419 | /* | |
420 | * Send an ICMP message in response to a situation | |
421 | * | |
422 | * RFC 1122: 3.2.2 MUST send at least the IP header and 8 bytes of header. | |
423 | * MAY send more (we do). | |
424 | * MUST NOT change this header information. | |
425 | * MUST NOT reply to a multicast/broadcast IP address. | |
426 | * MUST NOT reply to a multicast/broadcast MAC address. | |
427 | * MUST reply to only the first fragment. | |
428 | */ | |
429 | ||
e4883014 | 430 | void icmp_send(struct sk_buff *skb_in, int type, int code, __be32 info) |
1da177e4 LT |
431 | { |
432 | struct iphdr *iph; | |
433 | int room; | |
434 | struct icmp_bxm icmp_param; | |
435 | struct rtable *rt = (struct rtable *)skb_in->dst; | |
436 | struct ipcm_cookie ipc; | |
a61ced5d | 437 | __be32 saddr; |
1da177e4 LT |
438 | u8 tos; |
439 | ||
440 | if (!rt) | |
441 | goto out; | |
442 | ||
443 | /* | |
444 | * Find the original header. It is expected to be valid, of course. | |
445 | * Check this, icmp_send is called from the most obscure devices | |
446 | * sometimes. | |
447 | */ | |
eddc9ec5 | 448 | iph = ip_hdr(skb_in); |
1da177e4 | 449 | |
27a884dc ACM |
450 | if ((u8 *)iph < skb_in->head || |
451 | (skb_in->network_header + sizeof(*iph)) > skb_in->tail) | |
1da177e4 LT |
452 | goto out; |
453 | ||
454 | /* | |
455 | * No replies to physical multicast/broadcast | |
456 | */ | |
457 | if (skb_in->pkt_type != PACKET_HOST) | |
458 | goto out; | |
459 | ||
460 | /* | |
461 | * Now check at the protocol level | |
462 | */ | |
463 | if (rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST)) | |
464 | goto out; | |
465 | ||
466 | /* | |
467 | * Only reply to fragment 0. We byte re-order the constant | |
468 | * mask for efficiency. | |
469 | */ | |
470 | if (iph->frag_off & htons(IP_OFFSET)) | |
471 | goto out; | |
472 | ||
473 | /* | |
474 | * If we send an ICMP error to an ICMP error a mess would result.. | |
475 | */ | |
476 | if (icmp_pointers[type].error) { | |
477 | /* | |
478 | * We are an error, check if we are replying to an | |
479 | * ICMP error | |
480 | */ | |
481 | if (iph->protocol == IPPROTO_ICMP) { | |
482 | u8 _inner_type, *itp; | |
483 | ||
484 | itp = skb_header_pointer(skb_in, | |
d56f90a7 | 485 | skb_network_header(skb_in) + |
1da177e4 LT |
486 | (iph->ihl << 2) + |
487 | offsetof(struct icmphdr, | |
488 | type) - | |
489 | skb_in->data, | |
490 | sizeof(_inner_type), | |
491 | &_inner_type); | |
492 | if (itp == NULL) | |
493 | goto out; | |
494 | ||
495 | /* | |
496 | * Assume any unknown ICMP type is an error. This | |
497 | * isn't specified by the RFC, but think about it.. | |
498 | */ | |
499 | if (*itp > NR_ICMP_TYPES || | |
500 | icmp_pointers[*itp].error) | |
501 | goto out; | |
502 | } | |
503 | } | |
504 | ||
505 | if (icmp_xmit_lock()) | |
506 | return; | |
507 | ||
508 | /* | |
509 | * Construct source address and options. | |
510 | */ | |
511 | ||
512 | saddr = iph->daddr; | |
1c2fb7f9 | 513 | if (!(rt->rt_flags & RTCF_LOCAL)) { |
6e1d9103 PM |
514 | struct net_device *dev = NULL; |
515 | ||
516 | if (rt->fl.iif && sysctl_icmp_errors_use_inbound_ifaddr) | |
881d966b | 517 | dev = dev_get_by_index(&init_net, rt->fl.iif); |
6e1d9103 PM |
518 | |
519 | if (dev) { | |
520 | saddr = inet_select_addr(dev, 0, RT_SCOPE_LINK); | |
521 | dev_put(dev); | |
522 | } else | |
1c2fb7f9 S |
523 | saddr = 0; |
524 | } | |
1da177e4 LT |
525 | |
526 | tos = icmp_pointers[type].error ? ((iph->tos & IPTOS_TOS_MASK) | | |
527 | IPTOS_PREC_INTERNETCONTROL) : | |
528 | iph->tos; | |
529 | ||
530 | if (ip_options_echo(&icmp_param.replyopts, skb_in)) | |
fa60cf7f | 531 | goto out_unlock; |
1da177e4 LT |
532 | |
533 | ||
534 | /* | |
535 | * Prepare data for ICMP header. | |
536 | */ | |
537 | ||
538 | icmp_param.data.icmph.type = type; | |
539 | icmp_param.data.icmph.code = code; | |
540 | icmp_param.data.icmph.un.gateway = info; | |
541 | icmp_param.data.icmph.checksum = 0; | |
542 | icmp_param.skb = skb_in; | |
d56f90a7 | 543 | icmp_param.offset = skb_network_offset(skb_in); |
1da177e4 LT |
544 | inet_sk(icmp_socket->sk)->tos = tos; |
545 | ipc.addr = iph->saddr; | |
546 | ipc.opt = &icmp_param.replyopts; | |
547 | ||
548 | { | |
549 | struct flowi fl = { | |
550 | .nl_u = { | |
551 | .ip4_u = { | |
552 | .daddr = icmp_param.replyopts.srr ? | |
553 | icmp_param.replyopts.faddr : | |
554 | iph->saddr, | |
555 | .saddr = saddr, | |
556 | .tos = RT_TOS(tos) | |
557 | } | |
558 | }, | |
559 | .proto = IPPROTO_ICMP, | |
560 | .uli_u = { | |
561 | .icmpt = { | |
562 | .type = type, | |
563 | .code = code | |
564 | } | |
565 | } | |
566 | }; | |
8b7817f3 HX |
567 | int err; |
568 | struct rtable *rt2; | |
569 | ||
beb8d13b | 570 | security_skb_classify_flow(skb_in, &fl); |
8b7817f3 HX |
571 | if (__ip_route_output_key(&rt, &fl)) |
572 | goto out_unlock; | |
573 | ||
574 | /* No need to clone since we're just using its address. */ | |
575 | rt2 = rt; | |
576 | ||
577 | err = xfrm_lookup((struct dst_entry **)&rt, &fl, NULL, 0); | |
578 | switch (err) { | |
579 | case 0: | |
580 | if (rt != rt2) | |
581 | goto route_done; | |
582 | break; | |
583 | case -EPERM: | |
584 | rt = NULL; | |
585 | break; | |
586 | default: | |
587 | goto out_unlock; | |
588 | } | |
589 | ||
590 | if (xfrm_decode_session_reverse(skb_in, &fl, AF_INET)) | |
591 | goto out_unlock; | |
592 | ||
593 | if (inet_addr_type(fl.fl4_src) == RTN_LOCAL) | |
594 | err = __ip_route_output_key(&rt2, &fl); | |
595 | else { | |
596 | struct flowi fl2 = {}; | |
597 | struct dst_entry *odst; | |
598 | ||
599 | fl2.fl4_dst = fl.fl4_src; | |
600 | if (ip_route_output_key(&rt2, &fl2)) | |
601 | goto out_unlock; | |
602 | ||
603 | /* Ugh! */ | |
604 | odst = skb_in->dst; | |
605 | err = ip_route_input(skb_in, fl.fl4_dst, fl.fl4_src, | |
606 | RT_TOS(tos), rt2->u.dst.dev); | |
607 | ||
608 | dst_release(&rt2->u.dst); | |
609 | rt2 = (struct rtable *)skb_in->dst; | |
610 | skb_in->dst = odst; | |
611 | } | |
612 | ||
613 | if (err) | |
614 | goto out_unlock; | |
615 | ||
616 | err = xfrm_lookup((struct dst_entry **)&rt2, &fl, NULL, | |
617 | XFRM_LOOKUP_ICMP); | |
618 | if (err == -ENOENT) { | |
619 | if (!rt) | |
620 | goto out_unlock; | |
621 | goto route_done; | |
622 | } | |
623 | ||
624 | dst_release(&rt->u.dst); | |
625 | rt = rt2; | |
626 | ||
627 | if (err) | |
1da177e4 LT |
628 | goto out_unlock; |
629 | } | |
630 | ||
8b7817f3 | 631 | route_done: |
1da177e4 LT |
632 | if (!icmpv4_xrlim_allow(rt, type, code)) |
633 | goto ende; | |
634 | ||
635 | /* RFC says return as much as we can without exceeding 576 bytes. */ | |
636 | ||
637 | room = dst_mtu(&rt->u.dst); | |
638 | if (room > 576) | |
639 | room = 576; | |
640 | room -= sizeof(struct iphdr) + icmp_param.replyopts.optlen; | |
641 | room -= sizeof(struct icmphdr); | |
642 | ||
643 | icmp_param.data_len = skb_in->len - icmp_param.offset; | |
644 | if (icmp_param.data_len > room) | |
645 | icmp_param.data_len = room; | |
646 | icmp_param.head_len = sizeof(struct icmphdr); | |
647 | ||
648 | icmp_push_reply(&icmp_param, &ipc, rt); | |
649 | ende: | |
650 | ip_rt_put(rt); | |
651 | out_unlock: | |
652 | icmp_xmit_unlock(); | |
653 | out:; | |
654 | } | |
655 | ||
656 | ||
657 | /* | |
658 | * Handle ICMP_DEST_UNREACH, ICMP_TIME_EXCEED, and ICMP_QUENCH. | |
659 | */ | |
660 | ||
661 | static void icmp_unreach(struct sk_buff *skb) | |
662 | { | |
663 | struct iphdr *iph; | |
664 | struct icmphdr *icmph; | |
665 | int hash, protocol; | |
666 | struct net_protocol *ipprot; | |
1da177e4 LT |
667 | u32 info = 0; |
668 | ||
669 | /* | |
670 | * Incomplete header ? | |
671 | * Only checks for the IP header, there should be an | |
672 | * additional check for longer headers in upper levels. | |
673 | */ | |
674 | ||
675 | if (!pskb_may_pull(skb, sizeof(struct iphdr))) | |
676 | goto out_err; | |
677 | ||
88c7664f | 678 | icmph = icmp_hdr(skb); |
1da177e4 LT |
679 | iph = (struct iphdr *)skb->data; |
680 | ||
681 | if (iph->ihl < 5) /* Mangled header, drop. */ | |
682 | goto out_err; | |
683 | ||
684 | if (icmph->type == ICMP_DEST_UNREACH) { | |
685 | switch (icmph->code & 15) { | |
686 | case ICMP_NET_UNREACH: | |
687 | case ICMP_HOST_UNREACH: | |
688 | case ICMP_PROT_UNREACH: | |
689 | case ICMP_PORT_UNREACH: | |
690 | break; | |
691 | case ICMP_FRAG_NEEDED: | |
692 | if (ipv4_config.no_pmtu_disc) { | |
64ce2073 | 693 | LIMIT_NETDEBUG(KERN_INFO "ICMP: %u.%u.%u.%u: " |
1da177e4 LT |
694 | "fragmentation needed " |
695 | "and DF set.\n", | |
64ce2073 | 696 | NIPQUAD(iph->daddr)); |
1da177e4 LT |
697 | } else { |
698 | info = ip_rt_frag_needed(iph, | |
699 | ntohs(icmph->un.frag.mtu)); | |
700 | if (!info) | |
701 | goto out; | |
702 | } | |
703 | break; | |
704 | case ICMP_SR_FAILED: | |
64ce2073 | 705 | LIMIT_NETDEBUG(KERN_INFO "ICMP: %u.%u.%u.%u: Source " |
1da177e4 | 706 | "Route Failed.\n", |
64ce2073 | 707 | NIPQUAD(iph->daddr)); |
1da177e4 LT |
708 | break; |
709 | default: | |
710 | break; | |
711 | } | |
712 | if (icmph->code > NR_ICMP_UNREACH) | |
713 | goto out; | |
714 | } else if (icmph->type == ICMP_PARAMETERPROB) | |
715 | info = ntohl(icmph->un.gateway) >> 24; | |
716 | ||
717 | /* | |
718 | * Throw it at our lower layers | |
719 | * | |
720 | * RFC 1122: 3.2.2 MUST extract the protocol ID from the passed | |
721 | * header. | |
722 | * RFC 1122: 3.2.2.1 MUST pass ICMP unreach messages to the | |
723 | * transport layer. | |
724 | * RFC 1122: 3.2.2.2 MUST pass ICMP time expired messages to | |
725 | * transport layer. | |
726 | */ | |
727 | ||
728 | /* | |
729 | * Check the other end isnt violating RFC 1122. Some routers send | |
730 | * bogus responses to broadcast frames. If you see this message | |
731 | * first check your netmask matches at both ends, if it does then | |
732 | * get the other vendor to fix their kit. | |
733 | */ | |
734 | ||
735 | if (!sysctl_icmp_ignore_bogus_error_responses && | |
736 | inet_addr_type(iph->daddr) == RTN_BROADCAST) { | |
737 | if (net_ratelimit()) | |
738 | printk(KERN_WARNING "%u.%u.%u.%u sent an invalid ICMP " | |
739 | "type %u, code %u " | |
740 | "error to a broadcast: %u.%u.%u.%u on %s\n", | |
eddc9ec5 | 741 | NIPQUAD(ip_hdr(skb)->saddr), |
1da177e4 LT |
742 | icmph->type, icmph->code, |
743 | NIPQUAD(iph->daddr), | |
744 | skb->dev->name); | |
745 | goto out; | |
746 | } | |
747 | ||
748 | /* Checkin full IP header plus 8 bytes of protocol to | |
749 | * avoid additional coding at protocol handlers. | |
750 | */ | |
751 | if (!pskb_may_pull(skb, iph->ihl * 4 + 8)) | |
752 | goto out; | |
753 | ||
754 | iph = (struct iphdr *)skb->data; | |
755 | protocol = iph->protocol; | |
756 | ||
757 | /* | |
758 | * Deliver ICMP message to raw sockets. Pretty useless feature? | |
759 | */ | |
7bc54c90 | 760 | raw_icmp_error(skb, protocol, info); |
1da177e4 | 761 | |
1da177e4 | 762 | hash = protocol & (MAX_INET_PROTOS - 1); |
1da177e4 LT |
763 | rcu_read_lock(); |
764 | ipprot = rcu_dereference(inet_protos[hash]); | |
765 | if (ipprot && ipprot->err_handler) | |
766 | ipprot->err_handler(skb, info); | |
767 | rcu_read_unlock(); | |
768 | ||
769 | out: | |
770 | return; | |
771 | out_err: | |
772 | ICMP_INC_STATS_BH(ICMP_MIB_INERRORS); | |
773 | goto out; | |
774 | } | |
775 | ||
776 | ||
777 | /* | |
778 | * Handle ICMP_REDIRECT. | |
779 | */ | |
780 | ||
781 | static void icmp_redirect(struct sk_buff *skb) | |
782 | { | |
783 | struct iphdr *iph; | |
1da177e4 LT |
784 | |
785 | if (skb->len < sizeof(struct iphdr)) | |
786 | goto out_err; | |
787 | ||
788 | /* | |
789 | * Get the copied header of the packet that caused the redirect | |
790 | */ | |
791 | if (!pskb_may_pull(skb, sizeof(struct iphdr))) | |
792 | goto out; | |
793 | ||
794 | iph = (struct iphdr *)skb->data; | |
1da177e4 | 795 | |
88c7664f | 796 | switch (icmp_hdr(skb)->code & 7) { |
1da177e4 LT |
797 | case ICMP_REDIR_NET: |
798 | case ICMP_REDIR_NETTOS: | |
799 | /* | |
800 | * As per RFC recommendations now handle it as a host redirect. | |
801 | */ | |
802 | case ICMP_REDIR_HOST: | |
803 | case ICMP_REDIR_HOSTTOS: | |
eddc9ec5 | 804 | ip_rt_redirect(ip_hdr(skb)->saddr, iph->daddr, |
88c7664f | 805 | icmp_hdr(skb)->un.gateway, |
cef2685e | 806 | iph->saddr, skb->dev); |
1da177e4 | 807 | break; |
e905a9ed | 808 | } |
1da177e4 LT |
809 | out: |
810 | return; | |
811 | out_err: | |
812 | ICMP_INC_STATS_BH(ICMP_MIB_INERRORS); | |
813 | goto out; | |
814 | } | |
815 | ||
816 | /* | |
817 | * Handle ICMP_ECHO ("ping") requests. | |
818 | * | |
819 | * RFC 1122: 3.2.2.6 MUST have an echo server that answers ICMP echo | |
820 | * requests. | |
821 | * RFC 1122: 3.2.2.6 Data received in the ICMP_ECHO request MUST be | |
822 | * included in the reply. | |
823 | * RFC 1812: 4.3.3.6 SHOULD have a config option for silently ignoring | |
824 | * echo requests, MUST have default=NOT. | |
825 | * See also WRT handling of options once they are done and working. | |
826 | */ | |
827 | ||
828 | static void icmp_echo(struct sk_buff *skb) | |
829 | { | |
830 | if (!sysctl_icmp_echo_ignore_all) { | |
831 | struct icmp_bxm icmp_param; | |
832 | ||
88c7664f | 833 | icmp_param.data.icmph = *icmp_hdr(skb); |
1da177e4 LT |
834 | icmp_param.data.icmph.type = ICMP_ECHOREPLY; |
835 | icmp_param.skb = skb; | |
836 | icmp_param.offset = 0; | |
837 | icmp_param.data_len = skb->len; | |
838 | icmp_param.head_len = sizeof(struct icmphdr); | |
839 | icmp_reply(&icmp_param, skb); | |
840 | } | |
841 | } | |
842 | ||
843 | /* | |
844 | * Handle ICMP Timestamp requests. | |
845 | * RFC 1122: 3.2.2.8 MAY implement ICMP timestamp requests. | |
846 | * SHOULD be in the kernel for minimum random latency. | |
847 | * MUST be accurate to a few minutes. | |
848 | * MUST be updated at least at 15Hz. | |
849 | */ | |
850 | static void icmp_timestamp(struct sk_buff *skb) | |
851 | { | |
852 | struct timeval tv; | |
853 | struct icmp_bxm icmp_param; | |
854 | /* | |
855 | * Too short. | |
856 | */ | |
857 | if (skb->len < 4) | |
858 | goto out_err; | |
859 | ||
860 | /* | |
861 | * Fill in the current time as ms since midnight UT: | |
862 | */ | |
863 | do_gettimeofday(&tv); | |
864 | icmp_param.data.times[1] = htonl((tv.tv_sec % 86400) * 1000 + | |
865 | tv.tv_usec / 1000); | |
866 | icmp_param.data.times[2] = icmp_param.data.times[1]; | |
867 | if (skb_copy_bits(skb, 0, &icmp_param.data.times[0], 4)) | |
868 | BUG(); | |
88c7664f | 869 | icmp_param.data.icmph = *icmp_hdr(skb); |
1da177e4 LT |
870 | icmp_param.data.icmph.type = ICMP_TIMESTAMPREPLY; |
871 | icmp_param.data.icmph.code = 0; | |
872 | icmp_param.skb = skb; | |
873 | icmp_param.offset = 0; | |
874 | icmp_param.data_len = 0; | |
875 | icmp_param.head_len = sizeof(struct icmphdr) + 12; | |
876 | icmp_reply(&icmp_param, skb); | |
877 | out: | |
878 | return; | |
879 | out_err: | |
880 | ICMP_INC_STATS_BH(ICMP_MIB_INERRORS); | |
881 | goto out; | |
882 | } | |
883 | ||
884 | ||
885 | /* | |
886 | * Handle ICMP_ADDRESS_MASK requests. (RFC950) | |
887 | * | |
888 | * RFC1122 (3.2.2.9). A host MUST only send replies to | |
889 | * ADDRESS_MASK requests if it's been configured as an address mask | |
890 | * agent. Receiving a request doesn't constitute implicit permission to | |
891 | * act as one. Of course, implementing this correctly requires (SHOULD) | |
892 | * a way to turn the functionality on and off. Another one for sysctl(), | |
893 | * I guess. -- MS | |
894 | * | |
895 | * RFC1812 (4.3.3.9). A router MUST implement it. | |
896 | * A router SHOULD have switch turning it on/off. | |
897 | * This switch MUST be ON by default. | |
898 | * | |
899 | * Gratuitous replies, zero-source replies are not implemented, | |
900 | * that complies with RFC. DO NOT implement them!!! All the idea | |
901 | * of broadcast addrmask replies as specified in RFC950 is broken. | |
902 | * The problem is that it is not uncommon to have several prefixes | |
903 | * on one physical interface. Moreover, addrmask agent can even be | |
904 | * not aware of existing another prefixes. | |
905 | * If source is zero, addrmask agent cannot choose correct prefix. | |
906 | * Gratuitous mask announcements suffer from the same problem. | |
907 | * RFC1812 explains it, but still allows to use ADDRMASK, | |
908 | * that is pretty silly. --ANK | |
909 | * | |
910 | * All these rules are so bizarre, that I removed kernel addrmask | |
911 | * support at all. It is wrong, it is obsolete, nobody uses it in | |
912 | * any case. --ANK | |
913 | * | |
914 | * Furthermore you can do it with a usermode address agent program | |
915 | * anyway... | |
916 | */ | |
917 | ||
918 | static void icmp_address(struct sk_buff *skb) | |
919 | { | |
920 | #if 0 | |
921 | if (net_ratelimit()) | |
922 | printk(KERN_DEBUG "a guy asks for address mask. Who is it?\n"); | |
923 | #endif | |
924 | } | |
925 | ||
926 | /* | |
927 | * RFC1812 (4.3.3.9). A router SHOULD listen all replies, and complain | |
928 | * loudly if an inconsistency is found. | |
929 | */ | |
930 | ||
931 | static void icmp_address_reply(struct sk_buff *skb) | |
932 | { | |
933 | struct rtable *rt = (struct rtable *)skb->dst; | |
934 | struct net_device *dev = skb->dev; | |
935 | struct in_device *in_dev; | |
936 | struct in_ifaddr *ifa; | |
937 | ||
938 | if (skb->len < 4 || !(rt->rt_flags&RTCF_DIRECTSRC)) | |
939 | goto out; | |
940 | ||
941 | in_dev = in_dev_get(dev); | |
942 | if (!in_dev) | |
943 | goto out; | |
944 | rcu_read_lock(); | |
945 | if (in_dev->ifa_list && | |
946 | IN_DEV_LOG_MARTIANS(in_dev) && | |
947 | IN_DEV_FORWARD(in_dev)) { | |
a144ea4b | 948 | __be32 _mask, *mp; |
1da177e4 LT |
949 | |
950 | mp = skb_header_pointer(skb, 0, sizeof(_mask), &_mask); | |
09a62660 | 951 | BUG_ON(mp == NULL); |
1da177e4 LT |
952 | for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { |
953 | if (*mp == ifa->ifa_mask && | |
954 | inet_ifa_match(rt->rt_src, ifa)) | |
955 | break; | |
956 | } | |
957 | if (!ifa && net_ratelimit()) { | |
958 | printk(KERN_INFO "Wrong address mask %u.%u.%u.%u from " | |
959 | "%s/%u.%u.%u.%u\n", | |
960 | NIPQUAD(*mp), dev->name, NIPQUAD(rt->rt_src)); | |
961 | } | |
962 | } | |
963 | rcu_read_unlock(); | |
964 | in_dev_put(in_dev); | |
965 | out:; | |
966 | } | |
967 | ||
968 | static void icmp_discard(struct sk_buff *skb) | |
969 | { | |
970 | } | |
971 | ||
972 | /* | |
973 | * Deal with incoming ICMP packets. | |
974 | */ | |
975 | int icmp_rcv(struct sk_buff *skb) | |
976 | { | |
977 | struct icmphdr *icmph; | |
978 | struct rtable *rt = (struct rtable *)skb->dst; | |
979 | ||
7233b9f3 | 980 | if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb) && skb->sp && |
8b7817f3 HX |
981 | skb->sp->xvec[skb->sp->len - 1]->props.flags & XFRM_STATE_ICMP) { |
982 | int nh; | |
983 | ||
984 | if (!pskb_may_pull(skb, sizeof(*icmph) + sizeof(struct iphdr))) | |
985 | goto drop; | |
986 | ||
987 | nh = skb_network_offset(skb); | |
988 | skb_set_network_header(skb, sizeof(*icmph)); | |
989 | ||
990 | if (!xfrm4_policy_check_reverse(NULL, XFRM_POLICY_IN, skb)) | |
991 | goto drop; | |
992 | ||
993 | skb_set_network_header(skb, nh); | |
994 | } | |
995 | ||
1da177e4 LT |
996 | ICMP_INC_STATS_BH(ICMP_MIB_INMSGS); |
997 | ||
998 | switch (skb->ip_summed) { | |
84fa7933 | 999 | case CHECKSUM_COMPLETE: |
d3bc23e7 | 1000 | if (!csum_fold(skb->csum)) |
1da177e4 | 1001 | break; |
fb286bb2 | 1002 | /* fall through */ |
1da177e4 | 1003 | case CHECKSUM_NONE: |
fb286bb2 HX |
1004 | skb->csum = 0; |
1005 | if (__skb_checksum_complete(skb)) | |
1da177e4 | 1006 | goto error; |
1da177e4 LT |
1007 | } |
1008 | ||
8b7817f3 | 1009 | __skb_pull(skb, sizeof(*icmph)); |
1da177e4 | 1010 | |
88c7664f | 1011 | icmph = icmp_hdr(skb); |
1da177e4 | 1012 | |
96793b48 | 1013 | ICMPMSGIN_INC_STATS_BH(icmph->type); |
1da177e4 LT |
1014 | /* |
1015 | * 18 is the highest 'known' ICMP type. Anything else is a mystery | |
1016 | * | |
1017 | * RFC 1122: 3.2.2 Unknown ICMP messages types MUST be silently | |
1018 | * discarded. | |
1019 | */ | |
1020 | if (icmph->type > NR_ICMP_TYPES) | |
1021 | goto error; | |
1022 | ||
1023 | ||
1024 | /* | |
1025 | * Parse the ICMP message | |
1026 | */ | |
1027 | ||
e905a9ed | 1028 | if (rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST)) { |
1da177e4 LT |
1029 | /* |
1030 | * RFC 1122: 3.2.2.6 An ICMP_ECHO to broadcast MAY be | |
1031 | * silently ignored (we let user decide with a sysctl). | |
1032 | * RFC 1122: 3.2.2.8 An ICMP_TIMESTAMP MAY be silently | |
1033 | * discarded if to broadcast/multicast. | |
1034 | */ | |
4c866aa7 AK |
1035 | if ((icmph->type == ICMP_ECHO || |
1036 | icmph->type == ICMP_TIMESTAMP) && | |
1da177e4 LT |
1037 | sysctl_icmp_echo_ignore_broadcasts) { |
1038 | goto error; | |
1039 | } | |
1040 | if (icmph->type != ICMP_ECHO && | |
1041 | icmph->type != ICMP_TIMESTAMP && | |
1042 | icmph->type != ICMP_ADDRESS && | |
1043 | icmph->type != ICMP_ADDRESSREPLY) { | |
1044 | goto error; | |
e905a9ed | 1045 | } |
1da177e4 LT |
1046 | } |
1047 | ||
1da177e4 LT |
1048 | icmp_pointers[icmph->type].handler(skb); |
1049 | ||
1050 | drop: | |
1051 | kfree_skb(skb); | |
1052 | return 0; | |
1053 | error: | |
1054 | ICMP_INC_STATS_BH(ICMP_MIB_INERRORS); | |
1055 | goto drop; | |
1056 | } | |
1057 | ||
1058 | /* | |
1059 | * This table is the definition of how we handle ICMP. | |
1060 | */ | |
9b5b5cff | 1061 | static const struct icmp_control icmp_pointers[NR_ICMP_TYPES + 1] = { |
1da177e4 | 1062 | [ICMP_ECHOREPLY] = { |
1da177e4 LT |
1063 | .handler = icmp_discard, |
1064 | }, | |
1065 | [1] = { | |
1da177e4 LT |
1066 | .handler = icmp_discard, |
1067 | .error = 1, | |
1068 | }, | |
1069 | [2] = { | |
1da177e4 LT |
1070 | .handler = icmp_discard, |
1071 | .error = 1, | |
1072 | }, | |
1073 | [ICMP_DEST_UNREACH] = { | |
1da177e4 LT |
1074 | .handler = icmp_unreach, |
1075 | .error = 1, | |
1076 | }, | |
1077 | [ICMP_SOURCE_QUENCH] = { | |
1da177e4 LT |
1078 | .handler = icmp_unreach, |
1079 | .error = 1, | |
1080 | }, | |
1081 | [ICMP_REDIRECT] = { | |
1da177e4 LT |
1082 | .handler = icmp_redirect, |
1083 | .error = 1, | |
1084 | }, | |
1085 | [6] = { | |
1da177e4 LT |
1086 | .handler = icmp_discard, |
1087 | .error = 1, | |
1088 | }, | |
1089 | [7] = { | |
1da177e4 LT |
1090 | .handler = icmp_discard, |
1091 | .error = 1, | |
1092 | }, | |
1093 | [ICMP_ECHO] = { | |
1da177e4 LT |
1094 | .handler = icmp_echo, |
1095 | }, | |
1096 | [9] = { | |
1da177e4 LT |
1097 | .handler = icmp_discard, |
1098 | .error = 1, | |
1099 | }, | |
1100 | [10] = { | |
1da177e4 LT |
1101 | .handler = icmp_discard, |
1102 | .error = 1, | |
1103 | }, | |
1104 | [ICMP_TIME_EXCEEDED] = { | |
1da177e4 LT |
1105 | .handler = icmp_unreach, |
1106 | .error = 1, | |
1107 | }, | |
1108 | [ICMP_PARAMETERPROB] = { | |
1da177e4 LT |
1109 | .handler = icmp_unreach, |
1110 | .error = 1, | |
1111 | }, | |
1112 | [ICMP_TIMESTAMP] = { | |
1da177e4 LT |
1113 | .handler = icmp_timestamp, |
1114 | }, | |
1115 | [ICMP_TIMESTAMPREPLY] = { | |
1da177e4 LT |
1116 | .handler = icmp_discard, |
1117 | }, | |
1118 | [ICMP_INFO_REQUEST] = { | |
1da177e4 LT |
1119 | .handler = icmp_discard, |
1120 | }, | |
e905a9ed | 1121 | [ICMP_INFO_REPLY] = { |
1da177e4 LT |
1122 | .handler = icmp_discard, |
1123 | }, | |
1124 | [ICMP_ADDRESS] = { | |
1da177e4 LT |
1125 | .handler = icmp_address, |
1126 | }, | |
1127 | [ICMP_ADDRESSREPLY] = { | |
1da177e4 LT |
1128 | .handler = icmp_address_reply, |
1129 | }, | |
1130 | }; | |
1131 | ||
1132 | void __init icmp_init(struct net_proto_family *ops) | |
1133 | { | |
1134 | struct inet_sock *inet; | |
1135 | int i; | |
1136 | ||
6f912042 | 1137 | for_each_possible_cpu(i) { |
1da177e4 LT |
1138 | int err; |
1139 | ||
1da177e4 LT |
1140 | err = sock_create_kern(PF_INET, SOCK_RAW, IPPROTO_ICMP, |
1141 | &per_cpu(__icmp_socket, i)); | |
1142 | ||
1143 | if (err < 0) | |
1144 | panic("Failed to create the ICMP control socket.\n"); | |
1145 | ||
1146 | per_cpu(__icmp_socket, i)->sk->sk_allocation = GFP_ATOMIC; | |
1147 | ||
1148 | /* Enough space for 2 64K ICMP packets, including | |
1149 | * sk_buff struct overhead. | |
1150 | */ | |
1151 | per_cpu(__icmp_socket, i)->sk->sk_sndbuf = | |
1152 | (2 * ((64 * 1024) + sizeof(struct sk_buff))); | |
1153 | ||
1154 | inet = inet_sk(per_cpu(__icmp_socket, i)->sk); | |
1155 | inet->uc_ttl = -1; | |
1156 | inet->pmtudisc = IP_PMTUDISC_DONT; | |
1157 | ||
1158 | /* Unhash it so that IP input processing does not even | |
1159 | * see it, we do not wish this socket to see incoming | |
1160 | * packets. | |
1161 | */ | |
1162 | per_cpu(__icmp_socket, i)->sk->sk_prot->unhash(per_cpu(__icmp_socket, i)->sk); | |
1163 | } | |
1164 | } | |
1165 | ||
1166 | EXPORT_SYMBOL(icmp_err_convert); | |
1167 | EXPORT_SYMBOL(icmp_send); | |
1168 | EXPORT_SYMBOL(icmp_statistics); | |
1169 | EXPORT_SYMBOL(xrlim_allow); |