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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 | ||
67 | #include <linux/config.h> | |
68 | #include <linux/module.h> | |
69 | #include <linux/types.h> | |
70 | #include <linux/jiffies.h> | |
71 | #include <linux/kernel.h> | |
72 | #include <linux/fcntl.h> | |
73 | #include <linux/socket.h> | |
74 | #include <linux/in.h> | |
75 | #include <linux/inet.h> | |
14c85021 | 76 | #include <linux/inetdevice.h> |
1da177e4 LT |
77 | #include <linux/netdevice.h> |
78 | #include <linux/string.h> | |
79 | #include <linux/netfilter_ipv4.h> | |
80 | #include <net/snmp.h> | |
81 | #include <net/ip.h> | |
82 | #include <net/route.h> | |
83 | #include <net/protocol.h> | |
84 | #include <net/icmp.h> | |
85 | #include <net/tcp.h> | |
86 | #include <net/udp.h> | |
87 | #include <net/raw.h> | |
88 | #include <linux/skbuff.h> | |
89 | #include <net/sock.h> | |
90 | #include <linux/errno.h> | |
91 | #include <linux/timer.h> | |
92 | #include <linux/init.h> | |
93 | #include <asm/system.h> | |
94 | #include <asm/uaccess.h> | |
95 | #include <net/checksum.h> | |
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; | |
108 | __u32 times[3]; | |
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; |
1da177e4 LT |
119 | |
120 | /* An array of errno for error messages from dest unreach. */ | |
121 | /* RFC 1122: 3.2.2.1 States that NET_UNREACH, HOST_UNREACH and SR_FAILED MUST be considered 'transient errs'. */ | |
122 | ||
123 | struct icmp_err icmp_err_convert[] = { | |
124 | { | |
125 | .errno = ENETUNREACH, /* ICMP_NET_UNREACH */ | |
126 | .fatal = 0, | |
127 | }, | |
128 | { | |
129 | .errno = EHOSTUNREACH, /* ICMP_HOST_UNREACH */ | |
130 | .fatal = 0, | |
131 | }, | |
132 | { | |
133 | .errno = ENOPROTOOPT /* ICMP_PROT_UNREACH */, | |
134 | .fatal = 1, | |
135 | }, | |
136 | { | |
137 | .errno = ECONNREFUSED, /* ICMP_PORT_UNREACH */ | |
138 | .fatal = 1, | |
139 | }, | |
140 | { | |
141 | .errno = EMSGSIZE, /* ICMP_FRAG_NEEDED */ | |
142 | .fatal = 0, | |
143 | }, | |
144 | { | |
145 | .errno = EOPNOTSUPP, /* ICMP_SR_FAILED */ | |
146 | .fatal = 0, | |
147 | }, | |
148 | { | |
149 | .errno = ENETUNREACH, /* ICMP_NET_UNKNOWN */ | |
150 | .fatal = 1, | |
151 | }, | |
152 | { | |
153 | .errno = EHOSTDOWN, /* ICMP_HOST_UNKNOWN */ | |
154 | .fatal = 1, | |
155 | }, | |
156 | { | |
157 | .errno = ENONET, /* ICMP_HOST_ISOLATED */ | |
158 | .fatal = 1, | |
159 | }, | |
160 | { | |
161 | .errno = ENETUNREACH, /* ICMP_NET_ANO */ | |
162 | .fatal = 1, | |
163 | }, | |
164 | { | |
165 | .errno = EHOSTUNREACH, /* ICMP_HOST_ANO */ | |
166 | .fatal = 1, | |
167 | }, | |
168 | { | |
169 | .errno = ENETUNREACH, /* ICMP_NET_UNR_TOS */ | |
170 | .fatal = 0, | |
171 | }, | |
172 | { | |
173 | .errno = EHOSTUNREACH, /* ICMP_HOST_UNR_TOS */ | |
174 | .fatal = 0, | |
175 | }, | |
176 | { | |
177 | .errno = EHOSTUNREACH, /* ICMP_PKT_FILTERED */ | |
178 | .fatal = 1, | |
179 | }, | |
180 | { | |
181 | .errno = EHOSTUNREACH, /* ICMP_PREC_VIOLATION */ | |
182 | .fatal = 1, | |
183 | }, | |
184 | { | |
185 | .errno = EHOSTUNREACH, /* ICMP_PREC_CUTOFF */ | |
186 | .fatal = 1, | |
187 | }, | |
188 | }; | |
189 | ||
190 | /* Control parameters for ECHO replies. */ | |
191 | int sysctl_icmp_echo_ignore_all; | |
7ce31246 | 192 | int sysctl_icmp_echo_ignore_broadcasts = 1; |
1da177e4 LT |
193 | |
194 | /* Control parameter - ignore bogus broadcast responses? */ | |
195 | int sysctl_icmp_ignore_bogus_error_responses; | |
196 | ||
197 | /* | |
198 | * Configurable global rate limit. | |
199 | * | |
200 | * ratelimit defines tokens/packet consumed for dst->rate_token bucket | |
201 | * ratemask defines which icmp types are ratelimited by setting | |
202 | * it's bit position. | |
203 | * | |
204 | * default: | |
205 | * dest unreachable (3), source quench (4), | |
206 | * time exceeded (11), parameter problem (12) | |
207 | */ | |
208 | ||
209 | int sysctl_icmp_ratelimit = 1 * HZ; | |
210 | int sysctl_icmp_ratemask = 0x1818; | |
1c2fb7f9 | 211 | int sysctl_icmp_errors_use_inbound_ifaddr; |
1da177e4 LT |
212 | |
213 | /* | |
214 | * ICMP control array. This specifies what to do with each ICMP. | |
215 | */ | |
216 | ||
217 | struct icmp_control { | |
218 | int output_entry; /* Field for increment on output */ | |
219 | int input_entry; /* Field for increment on input */ | |
220 | void (*handler)(struct sk_buff *skb); | |
221 | short error; /* This ICMP is classed as an error message */ | |
222 | }; | |
223 | ||
9b5b5cff | 224 | static const struct icmp_control icmp_pointers[NR_ICMP_TYPES+1]; |
1da177e4 LT |
225 | |
226 | /* | |
227 | * The ICMP socket(s). This is the most convenient way to flow control | |
228 | * our ICMP output as well as maintain a clean interface throughout | |
229 | * all layers. All Socketless IP sends will soon be gone. | |
230 | * | |
231 | * On SMP we have one ICMP socket per-cpu. | |
232 | */ | |
233 | static DEFINE_PER_CPU(struct socket *, __icmp_socket) = NULL; | |
234 | #define icmp_socket __get_cpu_var(__icmp_socket) | |
235 | ||
236 | static __inline__ int icmp_xmit_lock(void) | |
237 | { | |
238 | local_bh_disable(); | |
239 | ||
240 | if (unlikely(!spin_trylock(&icmp_socket->sk->sk_lock.slock))) { | |
241 | /* This can happen if the output path signals a | |
242 | * dst_link_failure() for an outgoing ICMP packet. | |
243 | */ | |
244 | local_bh_enable(); | |
245 | return 1; | |
246 | } | |
247 | return 0; | |
248 | } | |
249 | ||
250 | static void icmp_xmit_unlock(void) | |
251 | { | |
252 | spin_unlock_bh(&icmp_socket->sk->sk_lock.slock); | |
253 | } | |
254 | ||
255 | /* | |
256 | * Send an ICMP frame. | |
257 | */ | |
258 | ||
259 | /* | |
260 | * Check transmit rate limitation for given message. | |
261 | * The rate information is held in the destination cache now. | |
262 | * This function is generic and could be used for other purposes | |
263 | * too. It uses a Token bucket filter as suggested by Alexey Kuznetsov. | |
264 | * | |
265 | * Note that the same dst_entry fields are modified by functions in | |
266 | * route.c too, but these work for packet destinations while xrlim_allow | |
267 | * works for icmp destinations. This means the rate limiting information | |
268 | * for one "ip object" is shared - and these ICMPs are twice limited: | |
269 | * by source and by destination. | |
270 | * | |
271 | * RFC 1812: 4.3.2.8 SHOULD be able to limit error message rate | |
272 | * SHOULD allow setting of rate limits | |
273 | * | |
274 | * Shared between ICMPv4 and ICMPv6. | |
275 | */ | |
276 | #define XRLIM_BURST_FACTOR 6 | |
277 | int xrlim_allow(struct dst_entry *dst, int timeout) | |
278 | { | |
279 | unsigned long now; | |
280 | int rc = 0; | |
281 | ||
282 | now = jiffies; | |
283 | dst->rate_tokens += now - dst->rate_last; | |
284 | dst->rate_last = now; | |
285 | if (dst->rate_tokens > XRLIM_BURST_FACTOR * timeout) | |
286 | dst->rate_tokens = XRLIM_BURST_FACTOR * timeout; | |
287 | if (dst->rate_tokens >= timeout) { | |
288 | dst->rate_tokens -= timeout; | |
289 | rc = 1; | |
290 | } | |
291 | return rc; | |
292 | } | |
293 | ||
294 | static inline int icmpv4_xrlim_allow(struct rtable *rt, int type, int code) | |
295 | { | |
296 | struct dst_entry *dst = &rt->u.dst; | |
297 | int rc = 1; | |
298 | ||
299 | if (type > NR_ICMP_TYPES) | |
300 | goto out; | |
301 | ||
302 | /* Don't limit PMTU discovery. */ | |
303 | if (type == ICMP_DEST_UNREACH && code == ICMP_FRAG_NEEDED) | |
304 | goto out; | |
305 | ||
306 | /* No rate limit on loopback */ | |
307 | if (dst->dev && (dst->dev->flags&IFF_LOOPBACK)) | |
308 | goto out; | |
309 | ||
310 | /* Limit if icmp type is enabled in ratemask. */ | |
311 | if ((1 << type) & sysctl_icmp_ratemask) | |
312 | rc = xrlim_allow(dst, sysctl_icmp_ratelimit); | |
313 | out: | |
314 | return rc; | |
315 | } | |
316 | ||
317 | /* | |
318 | * Maintain the counters used in the SNMP statistics for outgoing ICMP | |
319 | */ | |
320 | static void icmp_out_count(int type) | |
321 | { | |
322 | if (type <= NR_ICMP_TYPES) { | |
323 | ICMP_INC_STATS(icmp_pointers[type].output_entry); | |
324 | ICMP_INC_STATS(ICMP_MIB_OUTMSGS); | |
325 | } | |
326 | } | |
327 | ||
328 | /* | |
329 | * Checksum each fragment, and on the first include the headers and final | |
330 | * checksum. | |
331 | */ | |
332 | static int icmp_glue_bits(void *from, char *to, int offset, int len, int odd, | |
333 | struct sk_buff *skb) | |
334 | { | |
335 | struct icmp_bxm *icmp_param = (struct icmp_bxm *)from; | |
336 | unsigned int csum; | |
337 | ||
338 | csum = skb_copy_and_csum_bits(icmp_param->skb, | |
339 | icmp_param->offset + offset, | |
340 | to, len, 0); | |
341 | ||
342 | skb->csum = csum_block_add(skb->csum, csum, odd); | |
343 | if (icmp_pointers[icmp_param->data.icmph.type].error) | |
344 | nf_ct_attach(skb, icmp_param->skb); | |
345 | return 0; | |
346 | } | |
347 | ||
348 | static void icmp_push_reply(struct icmp_bxm *icmp_param, | |
349 | struct ipcm_cookie *ipc, struct rtable *rt) | |
350 | { | |
351 | struct sk_buff *skb; | |
352 | ||
cb94c62c PM |
353 | if (ip_append_data(icmp_socket->sk, icmp_glue_bits, icmp_param, |
354 | icmp_param->data_len+icmp_param->head_len, | |
355 | icmp_param->head_len, | |
356 | ipc, rt, MSG_DONTWAIT) < 0) | |
357 | ip_flush_pending_frames(icmp_socket->sk); | |
358 | else if ((skb = skb_peek(&icmp_socket->sk->sk_write_queue)) != NULL) { | |
1da177e4 LT |
359 | struct icmphdr *icmph = skb->h.icmph; |
360 | unsigned int csum = 0; | |
361 | struct sk_buff *skb1; | |
362 | ||
363 | skb_queue_walk(&icmp_socket->sk->sk_write_queue, skb1) { | |
364 | csum = csum_add(csum, skb1->csum); | |
365 | } | |
366 | csum = csum_partial_copy_nocheck((void *)&icmp_param->data, | |
367 | (char *)icmph, | |
368 | icmp_param->head_len, csum); | |
369 | icmph->checksum = csum_fold(csum); | |
370 | skb->ip_summed = CHECKSUM_NONE; | |
371 | ip_push_pending_frames(icmp_socket->sk); | |
372 | } | |
373 | } | |
374 | ||
375 | /* | |
376 | * Driving logic for building and sending ICMP messages. | |
377 | */ | |
378 | ||
379 | static void icmp_reply(struct icmp_bxm *icmp_param, struct sk_buff *skb) | |
380 | { | |
381 | struct sock *sk = icmp_socket->sk; | |
382 | struct inet_sock *inet = inet_sk(sk); | |
383 | struct ipcm_cookie ipc; | |
384 | struct rtable *rt = (struct rtable *)skb->dst; | |
385 | u32 daddr; | |
386 | ||
387 | if (ip_options_echo(&icmp_param->replyopts, skb)) | |
388 | goto out; | |
389 | ||
390 | if (icmp_xmit_lock()) | |
391 | return; | |
392 | ||
393 | icmp_param->data.icmph.checksum = 0; | |
394 | icmp_out_count(icmp_param->data.icmph.type); | |
395 | ||
396 | inet->tos = skb->nh.iph->tos; | |
397 | daddr = ipc.addr = rt->rt_src; | |
398 | ipc.opt = NULL; | |
399 | if (icmp_param->replyopts.optlen) { | |
400 | ipc.opt = &icmp_param->replyopts; | |
401 | if (ipc.opt->srr) | |
402 | daddr = icmp_param->replyopts.faddr; | |
403 | } | |
404 | { | |
405 | struct flowi fl = { .nl_u = { .ip4_u = | |
406 | { .daddr = daddr, | |
407 | .saddr = rt->rt_spec_dst, | |
408 | .tos = RT_TOS(skb->nh.iph->tos) } }, | |
409 | .proto = IPPROTO_ICMP }; | |
410 | if (ip_route_output_key(&rt, &fl)) | |
411 | goto out_unlock; | |
412 | } | |
413 | if (icmpv4_xrlim_allow(rt, icmp_param->data.icmph.type, | |
414 | icmp_param->data.icmph.code)) | |
415 | icmp_push_reply(icmp_param, &ipc, rt); | |
416 | ip_rt_put(rt); | |
417 | out_unlock: | |
418 | icmp_xmit_unlock(); | |
419 | out:; | |
420 | } | |
421 | ||
422 | ||
423 | /* | |
424 | * Send an ICMP message in response to a situation | |
425 | * | |
426 | * RFC 1122: 3.2.2 MUST send at least the IP header and 8 bytes of header. | |
427 | * MAY send more (we do). | |
428 | * MUST NOT change this header information. | |
429 | * MUST NOT reply to a multicast/broadcast IP address. | |
430 | * MUST NOT reply to a multicast/broadcast MAC address. | |
431 | * MUST reply to only the first fragment. | |
432 | */ | |
433 | ||
434 | void icmp_send(struct sk_buff *skb_in, int type, int code, u32 info) | |
435 | { | |
436 | struct iphdr *iph; | |
437 | int room; | |
438 | struct icmp_bxm icmp_param; | |
439 | struct rtable *rt = (struct rtable *)skb_in->dst; | |
440 | struct ipcm_cookie ipc; | |
441 | u32 saddr; | |
442 | u8 tos; | |
443 | ||
444 | if (!rt) | |
445 | goto out; | |
446 | ||
447 | /* | |
448 | * Find the original header. It is expected to be valid, of course. | |
449 | * Check this, icmp_send is called from the most obscure devices | |
450 | * sometimes. | |
451 | */ | |
452 | iph = skb_in->nh.iph; | |
453 | ||
454 | if ((u8 *)iph < skb_in->head || (u8 *)(iph + 1) > skb_in->tail) | |
455 | goto out; | |
456 | ||
457 | /* | |
458 | * No replies to physical multicast/broadcast | |
459 | */ | |
460 | if (skb_in->pkt_type != PACKET_HOST) | |
461 | goto out; | |
462 | ||
463 | /* | |
464 | * Now check at the protocol level | |
465 | */ | |
466 | if (rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST)) | |
467 | goto out; | |
468 | ||
469 | /* | |
470 | * Only reply to fragment 0. We byte re-order the constant | |
471 | * mask for efficiency. | |
472 | */ | |
473 | if (iph->frag_off & htons(IP_OFFSET)) | |
474 | goto out; | |
475 | ||
476 | /* | |
477 | * If we send an ICMP error to an ICMP error a mess would result.. | |
478 | */ | |
479 | if (icmp_pointers[type].error) { | |
480 | /* | |
481 | * We are an error, check if we are replying to an | |
482 | * ICMP error | |
483 | */ | |
484 | if (iph->protocol == IPPROTO_ICMP) { | |
485 | u8 _inner_type, *itp; | |
486 | ||
487 | itp = skb_header_pointer(skb_in, | |
488 | skb_in->nh.raw + | |
489 | (iph->ihl << 2) + | |
490 | offsetof(struct icmphdr, | |
491 | type) - | |
492 | skb_in->data, | |
493 | sizeof(_inner_type), | |
494 | &_inner_type); | |
495 | if (itp == NULL) | |
496 | goto out; | |
497 | ||
498 | /* | |
499 | * Assume any unknown ICMP type is an error. This | |
500 | * isn't specified by the RFC, but think about it.. | |
501 | */ | |
502 | if (*itp > NR_ICMP_TYPES || | |
503 | icmp_pointers[*itp].error) | |
504 | goto out; | |
505 | } | |
506 | } | |
507 | ||
508 | if (icmp_xmit_lock()) | |
509 | return; | |
510 | ||
511 | /* | |
512 | * Construct source address and options. | |
513 | */ | |
514 | ||
515 | saddr = iph->daddr; | |
1c2fb7f9 S |
516 | if (!(rt->rt_flags & RTCF_LOCAL)) { |
517 | if (sysctl_icmp_errors_use_inbound_ifaddr) | |
518 | saddr = inet_select_addr(skb_in->dev, 0, RT_SCOPE_LINK); | |
519 | else | |
520 | saddr = 0; | |
521 | } | |
1da177e4 LT |
522 | |
523 | tos = icmp_pointers[type].error ? ((iph->tos & IPTOS_TOS_MASK) | | |
524 | IPTOS_PREC_INTERNETCONTROL) : | |
525 | iph->tos; | |
526 | ||
527 | if (ip_options_echo(&icmp_param.replyopts, skb_in)) | |
528 | goto ende; | |
529 | ||
530 | ||
531 | /* | |
532 | * Prepare data for ICMP header. | |
533 | */ | |
534 | ||
535 | icmp_param.data.icmph.type = type; | |
536 | icmp_param.data.icmph.code = code; | |
537 | icmp_param.data.icmph.un.gateway = info; | |
538 | icmp_param.data.icmph.checksum = 0; | |
539 | icmp_param.skb = skb_in; | |
540 | icmp_param.offset = skb_in->nh.raw - skb_in->data; | |
541 | icmp_out_count(icmp_param.data.icmph.type); | |
542 | inet_sk(icmp_socket->sk)->tos = tos; | |
543 | ipc.addr = iph->saddr; | |
544 | ipc.opt = &icmp_param.replyopts; | |
545 | ||
546 | { | |
547 | struct flowi fl = { | |
548 | .nl_u = { | |
549 | .ip4_u = { | |
550 | .daddr = icmp_param.replyopts.srr ? | |
551 | icmp_param.replyopts.faddr : | |
552 | iph->saddr, | |
553 | .saddr = saddr, | |
554 | .tos = RT_TOS(tos) | |
555 | } | |
556 | }, | |
557 | .proto = IPPROTO_ICMP, | |
558 | .uli_u = { | |
559 | .icmpt = { | |
560 | .type = type, | |
561 | .code = code | |
562 | } | |
563 | } | |
564 | }; | |
565 | if (ip_route_output_key(&rt, &fl)) | |
566 | goto out_unlock; | |
567 | } | |
568 | ||
569 | if (!icmpv4_xrlim_allow(rt, type, code)) | |
570 | goto ende; | |
571 | ||
572 | /* RFC says return as much as we can without exceeding 576 bytes. */ | |
573 | ||
574 | room = dst_mtu(&rt->u.dst); | |
575 | if (room > 576) | |
576 | room = 576; | |
577 | room -= sizeof(struct iphdr) + icmp_param.replyopts.optlen; | |
578 | room -= sizeof(struct icmphdr); | |
579 | ||
580 | icmp_param.data_len = skb_in->len - icmp_param.offset; | |
581 | if (icmp_param.data_len > room) | |
582 | icmp_param.data_len = room; | |
583 | icmp_param.head_len = sizeof(struct icmphdr); | |
584 | ||
585 | icmp_push_reply(&icmp_param, &ipc, rt); | |
586 | ende: | |
587 | ip_rt_put(rt); | |
588 | out_unlock: | |
589 | icmp_xmit_unlock(); | |
590 | out:; | |
591 | } | |
592 | ||
593 | ||
594 | /* | |
595 | * Handle ICMP_DEST_UNREACH, ICMP_TIME_EXCEED, and ICMP_QUENCH. | |
596 | */ | |
597 | ||
598 | static void icmp_unreach(struct sk_buff *skb) | |
599 | { | |
600 | struct iphdr *iph; | |
601 | struct icmphdr *icmph; | |
602 | int hash, protocol; | |
603 | struct net_protocol *ipprot; | |
604 | struct sock *raw_sk; | |
605 | u32 info = 0; | |
606 | ||
607 | /* | |
608 | * Incomplete header ? | |
609 | * Only checks for the IP header, there should be an | |
610 | * additional check for longer headers in upper levels. | |
611 | */ | |
612 | ||
613 | if (!pskb_may_pull(skb, sizeof(struct iphdr))) | |
614 | goto out_err; | |
615 | ||
616 | icmph = skb->h.icmph; | |
617 | iph = (struct iphdr *)skb->data; | |
618 | ||
619 | if (iph->ihl < 5) /* Mangled header, drop. */ | |
620 | goto out_err; | |
621 | ||
622 | if (icmph->type == ICMP_DEST_UNREACH) { | |
623 | switch (icmph->code & 15) { | |
624 | case ICMP_NET_UNREACH: | |
625 | case ICMP_HOST_UNREACH: | |
626 | case ICMP_PROT_UNREACH: | |
627 | case ICMP_PORT_UNREACH: | |
628 | break; | |
629 | case ICMP_FRAG_NEEDED: | |
630 | if (ipv4_config.no_pmtu_disc) { | |
64ce2073 | 631 | LIMIT_NETDEBUG(KERN_INFO "ICMP: %u.%u.%u.%u: " |
1da177e4 LT |
632 | "fragmentation needed " |
633 | "and DF set.\n", | |
64ce2073 | 634 | NIPQUAD(iph->daddr)); |
1da177e4 LT |
635 | } else { |
636 | info = ip_rt_frag_needed(iph, | |
637 | ntohs(icmph->un.frag.mtu)); | |
638 | if (!info) | |
639 | goto out; | |
640 | } | |
641 | break; | |
642 | case ICMP_SR_FAILED: | |
64ce2073 | 643 | LIMIT_NETDEBUG(KERN_INFO "ICMP: %u.%u.%u.%u: Source " |
1da177e4 | 644 | "Route Failed.\n", |
64ce2073 | 645 | NIPQUAD(iph->daddr)); |
1da177e4 LT |
646 | break; |
647 | default: | |
648 | break; | |
649 | } | |
650 | if (icmph->code > NR_ICMP_UNREACH) | |
651 | goto out; | |
652 | } else if (icmph->type == ICMP_PARAMETERPROB) | |
653 | info = ntohl(icmph->un.gateway) >> 24; | |
654 | ||
655 | /* | |
656 | * Throw it at our lower layers | |
657 | * | |
658 | * RFC 1122: 3.2.2 MUST extract the protocol ID from the passed | |
659 | * header. | |
660 | * RFC 1122: 3.2.2.1 MUST pass ICMP unreach messages to the | |
661 | * transport layer. | |
662 | * RFC 1122: 3.2.2.2 MUST pass ICMP time expired messages to | |
663 | * transport layer. | |
664 | */ | |
665 | ||
666 | /* | |
667 | * Check the other end isnt violating RFC 1122. Some routers send | |
668 | * bogus responses to broadcast frames. If you see this message | |
669 | * first check your netmask matches at both ends, if it does then | |
670 | * get the other vendor to fix their kit. | |
671 | */ | |
672 | ||
673 | if (!sysctl_icmp_ignore_bogus_error_responses && | |
674 | inet_addr_type(iph->daddr) == RTN_BROADCAST) { | |
675 | if (net_ratelimit()) | |
676 | printk(KERN_WARNING "%u.%u.%u.%u sent an invalid ICMP " | |
677 | "type %u, code %u " | |
678 | "error to a broadcast: %u.%u.%u.%u on %s\n", | |
679 | NIPQUAD(skb->nh.iph->saddr), | |
680 | icmph->type, icmph->code, | |
681 | NIPQUAD(iph->daddr), | |
682 | skb->dev->name); | |
683 | goto out; | |
684 | } | |
685 | ||
686 | /* Checkin full IP header plus 8 bytes of protocol to | |
687 | * avoid additional coding at protocol handlers. | |
688 | */ | |
689 | if (!pskb_may_pull(skb, iph->ihl * 4 + 8)) | |
690 | goto out; | |
691 | ||
692 | iph = (struct iphdr *)skb->data; | |
693 | protocol = iph->protocol; | |
694 | ||
695 | /* | |
696 | * Deliver ICMP message to raw sockets. Pretty useless feature? | |
697 | */ | |
698 | ||
699 | /* Note: See raw.c and net/raw.h, RAWV4_HTABLE_SIZE==MAX_INET_PROTOS */ | |
700 | hash = protocol & (MAX_INET_PROTOS - 1); | |
701 | read_lock(&raw_v4_lock); | |
702 | if ((raw_sk = sk_head(&raw_v4_htable[hash])) != NULL) { | |
703 | while ((raw_sk = __raw_v4_lookup(raw_sk, protocol, iph->daddr, | |
704 | iph->saddr, | |
705 | skb->dev->ifindex)) != NULL) { | |
706 | raw_err(raw_sk, skb, info); | |
707 | raw_sk = sk_next(raw_sk); | |
708 | iph = (struct iphdr *)skb->data; | |
709 | } | |
710 | } | |
711 | read_unlock(&raw_v4_lock); | |
712 | ||
713 | rcu_read_lock(); | |
714 | ipprot = rcu_dereference(inet_protos[hash]); | |
715 | if (ipprot && ipprot->err_handler) | |
716 | ipprot->err_handler(skb, info); | |
717 | rcu_read_unlock(); | |
718 | ||
719 | out: | |
720 | return; | |
721 | out_err: | |
722 | ICMP_INC_STATS_BH(ICMP_MIB_INERRORS); | |
723 | goto out; | |
724 | } | |
725 | ||
726 | ||
727 | /* | |
728 | * Handle ICMP_REDIRECT. | |
729 | */ | |
730 | ||
731 | static void icmp_redirect(struct sk_buff *skb) | |
732 | { | |
733 | struct iphdr *iph; | |
734 | unsigned long ip; | |
735 | ||
736 | if (skb->len < sizeof(struct iphdr)) | |
737 | goto out_err; | |
738 | ||
739 | /* | |
740 | * Get the copied header of the packet that caused the redirect | |
741 | */ | |
742 | if (!pskb_may_pull(skb, sizeof(struct iphdr))) | |
743 | goto out; | |
744 | ||
745 | iph = (struct iphdr *)skb->data; | |
746 | ip = iph->daddr; | |
747 | ||
748 | switch (skb->h.icmph->code & 7) { | |
749 | case ICMP_REDIR_NET: | |
750 | case ICMP_REDIR_NETTOS: | |
751 | /* | |
752 | * As per RFC recommendations now handle it as a host redirect. | |
753 | */ | |
754 | case ICMP_REDIR_HOST: | |
755 | case ICMP_REDIR_HOSTTOS: | |
756 | ip_rt_redirect(skb->nh.iph->saddr, ip, skb->h.icmph->un.gateway, | |
757 | iph->saddr, iph->tos, skb->dev); | |
758 | break; | |
759 | } | |
760 | out: | |
761 | return; | |
762 | out_err: | |
763 | ICMP_INC_STATS_BH(ICMP_MIB_INERRORS); | |
764 | goto out; | |
765 | } | |
766 | ||
767 | /* | |
768 | * Handle ICMP_ECHO ("ping") requests. | |
769 | * | |
770 | * RFC 1122: 3.2.2.6 MUST have an echo server that answers ICMP echo | |
771 | * requests. | |
772 | * RFC 1122: 3.2.2.6 Data received in the ICMP_ECHO request MUST be | |
773 | * included in the reply. | |
774 | * RFC 1812: 4.3.3.6 SHOULD have a config option for silently ignoring | |
775 | * echo requests, MUST have default=NOT. | |
776 | * See also WRT handling of options once they are done and working. | |
777 | */ | |
778 | ||
779 | static void icmp_echo(struct sk_buff *skb) | |
780 | { | |
781 | if (!sysctl_icmp_echo_ignore_all) { | |
782 | struct icmp_bxm icmp_param; | |
783 | ||
784 | icmp_param.data.icmph = *skb->h.icmph; | |
785 | icmp_param.data.icmph.type = ICMP_ECHOREPLY; | |
786 | icmp_param.skb = skb; | |
787 | icmp_param.offset = 0; | |
788 | icmp_param.data_len = skb->len; | |
789 | icmp_param.head_len = sizeof(struct icmphdr); | |
790 | icmp_reply(&icmp_param, skb); | |
791 | } | |
792 | } | |
793 | ||
794 | /* | |
795 | * Handle ICMP Timestamp requests. | |
796 | * RFC 1122: 3.2.2.8 MAY implement ICMP timestamp requests. | |
797 | * SHOULD be in the kernel for minimum random latency. | |
798 | * MUST be accurate to a few minutes. | |
799 | * MUST be updated at least at 15Hz. | |
800 | */ | |
801 | static void icmp_timestamp(struct sk_buff *skb) | |
802 | { | |
803 | struct timeval tv; | |
804 | struct icmp_bxm icmp_param; | |
805 | /* | |
806 | * Too short. | |
807 | */ | |
808 | if (skb->len < 4) | |
809 | goto out_err; | |
810 | ||
811 | /* | |
812 | * Fill in the current time as ms since midnight UT: | |
813 | */ | |
814 | do_gettimeofday(&tv); | |
815 | icmp_param.data.times[1] = htonl((tv.tv_sec % 86400) * 1000 + | |
816 | tv.tv_usec / 1000); | |
817 | icmp_param.data.times[2] = icmp_param.data.times[1]; | |
818 | if (skb_copy_bits(skb, 0, &icmp_param.data.times[0], 4)) | |
819 | BUG(); | |
820 | icmp_param.data.icmph = *skb->h.icmph; | |
821 | icmp_param.data.icmph.type = ICMP_TIMESTAMPREPLY; | |
822 | icmp_param.data.icmph.code = 0; | |
823 | icmp_param.skb = skb; | |
824 | icmp_param.offset = 0; | |
825 | icmp_param.data_len = 0; | |
826 | icmp_param.head_len = sizeof(struct icmphdr) + 12; | |
827 | icmp_reply(&icmp_param, skb); | |
828 | out: | |
829 | return; | |
830 | out_err: | |
831 | ICMP_INC_STATS_BH(ICMP_MIB_INERRORS); | |
832 | goto out; | |
833 | } | |
834 | ||
835 | ||
836 | /* | |
837 | * Handle ICMP_ADDRESS_MASK requests. (RFC950) | |
838 | * | |
839 | * RFC1122 (3.2.2.9). A host MUST only send replies to | |
840 | * ADDRESS_MASK requests if it's been configured as an address mask | |
841 | * agent. Receiving a request doesn't constitute implicit permission to | |
842 | * act as one. Of course, implementing this correctly requires (SHOULD) | |
843 | * a way to turn the functionality on and off. Another one for sysctl(), | |
844 | * I guess. -- MS | |
845 | * | |
846 | * RFC1812 (4.3.3.9). A router MUST implement it. | |
847 | * A router SHOULD have switch turning it on/off. | |
848 | * This switch MUST be ON by default. | |
849 | * | |
850 | * Gratuitous replies, zero-source replies are not implemented, | |
851 | * that complies with RFC. DO NOT implement them!!! All the idea | |
852 | * of broadcast addrmask replies as specified in RFC950 is broken. | |
853 | * The problem is that it is not uncommon to have several prefixes | |
854 | * on one physical interface. Moreover, addrmask agent can even be | |
855 | * not aware of existing another prefixes. | |
856 | * If source is zero, addrmask agent cannot choose correct prefix. | |
857 | * Gratuitous mask announcements suffer from the same problem. | |
858 | * RFC1812 explains it, but still allows to use ADDRMASK, | |
859 | * that is pretty silly. --ANK | |
860 | * | |
861 | * All these rules are so bizarre, that I removed kernel addrmask | |
862 | * support at all. It is wrong, it is obsolete, nobody uses it in | |
863 | * any case. --ANK | |
864 | * | |
865 | * Furthermore you can do it with a usermode address agent program | |
866 | * anyway... | |
867 | */ | |
868 | ||
869 | static void icmp_address(struct sk_buff *skb) | |
870 | { | |
871 | #if 0 | |
872 | if (net_ratelimit()) | |
873 | printk(KERN_DEBUG "a guy asks for address mask. Who is it?\n"); | |
874 | #endif | |
875 | } | |
876 | ||
877 | /* | |
878 | * RFC1812 (4.3.3.9). A router SHOULD listen all replies, and complain | |
879 | * loudly if an inconsistency is found. | |
880 | */ | |
881 | ||
882 | static void icmp_address_reply(struct sk_buff *skb) | |
883 | { | |
884 | struct rtable *rt = (struct rtable *)skb->dst; | |
885 | struct net_device *dev = skb->dev; | |
886 | struct in_device *in_dev; | |
887 | struct in_ifaddr *ifa; | |
888 | ||
889 | if (skb->len < 4 || !(rt->rt_flags&RTCF_DIRECTSRC)) | |
890 | goto out; | |
891 | ||
892 | in_dev = in_dev_get(dev); | |
893 | if (!in_dev) | |
894 | goto out; | |
895 | rcu_read_lock(); | |
896 | if (in_dev->ifa_list && | |
897 | IN_DEV_LOG_MARTIANS(in_dev) && | |
898 | IN_DEV_FORWARD(in_dev)) { | |
899 | u32 _mask, *mp; | |
900 | ||
901 | mp = skb_header_pointer(skb, 0, sizeof(_mask), &_mask); | |
902 | if (mp == NULL) | |
903 | BUG(); | |
904 | for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { | |
905 | if (*mp == ifa->ifa_mask && | |
906 | inet_ifa_match(rt->rt_src, ifa)) | |
907 | break; | |
908 | } | |
909 | if (!ifa && net_ratelimit()) { | |
910 | printk(KERN_INFO "Wrong address mask %u.%u.%u.%u from " | |
911 | "%s/%u.%u.%u.%u\n", | |
912 | NIPQUAD(*mp), dev->name, NIPQUAD(rt->rt_src)); | |
913 | } | |
914 | } | |
915 | rcu_read_unlock(); | |
916 | in_dev_put(in_dev); | |
917 | out:; | |
918 | } | |
919 | ||
920 | static void icmp_discard(struct sk_buff *skb) | |
921 | { | |
922 | } | |
923 | ||
924 | /* | |
925 | * Deal with incoming ICMP packets. | |
926 | */ | |
927 | int icmp_rcv(struct sk_buff *skb) | |
928 | { | |
929 | struct icmphdr *icmph; | |
930 | struct rtable *rt = (struct rtable *)skb->dst; | |
931 | ||
932 | ICMP_INC_STATS_BH(ICMP_MIB_INMSGS); | |
933 | ||
934 | switch (skb->ip_summed) { | |
935 | case CHECKSUM_HW: | |
936 | if (!(u16)csum_fold(skb->csum)) | |
937 | break; | |
fb286bb2 | 938 | /* fall through */ |
1da177e4 | 939 | case CHECKSUM_NONE: |
fb286bb2 HX |
940 | skb->csum = 0; |
941 | if (__skb_checksum_complete(skb)) | |
1da177e4 | 942 | goto error; |
1da177e4 LT |
943 | } |
944 | ||
945 | if (!pskb_pull(skb, sizeof(struct icmphdr))) | |
946 | goto error; | |
947 | ||
948 | icmph = skb->h.icmph; | |
949 | ||
950 | /* | |
951 | * 18 is the highest 'known' ICMP type. Anything else is a mystery | |
952 | * | |
953 | * RFC 1122: 3.2.2 Unknown ICMP messages types MUST be silently | |
954 | * discarded. | |
955 | */ | |
956 | if (icmph->type > NR_ICMP_TYPES) | |
957 | goto error; | |
958 | ||
959 | ||
960 | /* | |
961 | * Parse the ICMP message | |
962 | */ | |
963 | ||
964 | if (rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST)) { | |
965 | /* | |
966 | * RFC 1122: 3.2.2.6 An ICMP_ECHO to broadcast MAY be | |
967 | * silently ignored (we let user decide with a sysctl). | |
968 | * RFC 1122: 3.2.2.8 An ICMP_TIMESTAMP MAY be silently | |
969 | * discarded if to broadcast/multicast. | |
970 | */ | |
4c866aa7 AK |
971 | if ((icmph->type == ICMP_ECHO || |
972 | icmph->type == ICMP_TIMESTAMP) && | |
1da177e4 LT |
973 | sysctl_icmp_echo_ignore_broadcasts) { |
974 | goto error; | |
975 | } | |
976 | if (icmph->type != ICMP_ECHO && | |
977 | icmph->type != ICMP_TIMESTAMP && | |
978 | icmph->type != ICMP_ADDRESS && | |
979 | icmph->type != ICMP_ADDRESSREPLY) { | |
980 | goto error; | |
981 | } | |
982 | } | |
983 | ||
984 | ICMP_INC_STATS_BH(icmp_pointers[icmph->type].input_entry); | |
985 | icmp_pointers[icmph->type].handler(skb); | |
986 | ||
987 | drop: | |
988 | kfree_skb(skb); | |
989 | return 0; | |
990 | error: | |
991 | ICMP_INC_STATS_BH(ICMP_MIB_INERRORS); | |
992 | goto drop; | |
993 | } | |
994 | ||
995 | /* | |
996 | * This table is the definition of how we handle ICMP. | |
997 | */ | |
9b5b5cff | 998 | static const struct icmp_control icmp_pointers[NR_ICMP_TYPES + 1] = { |
1da177e4 LT |
999 | [ICMP_ECHOREPLY] = { |
1000 | .output_entry = ICMP_MIB_OUTECHOREPS, | |
1001 | .input_entry = ICMP_MIB_INECHOREPS, | |
1002 | .handler = icmp_discard, | |
1003 | }, | |
1004 | [1] = { | |
1005 | .output_entry = ICMP_MIB_DUMMY, | |
1006 | .input_entry = ICMP_MIB_INERRORS, | |
1007 | .handler = icmp_discard, | |
1008 | .error = 1, | |
1009 | }, | |
1010 | [2] = { | |
1011 | .output_entry = ICMP_MIB_DUMMY, | |
1012 | .input_entry = ICMP_MIB_INERRORS, | |
1013 | .handler = icmp_discard, | |
1014 | .error = 1, | |
1015 | }, | |
1016 | [ICMP_DEST_UNREACH] = { | |
1017 | .output_entry = ICMP_MIB_OUTDESTUNREACHS, | |
1018 | .input_entry = ICMP_MIB_INDESTUNREACHS, | |
1019 | .handler = icmp_unreach, | |
1020 | .error = 1, | |
1021 | }, | |
1022 | [ICMP_SOURCE_QUENCH] = { | |
1023 | .output_entry = ICMP_MIB_OUTSRCQUENCHS, | |
1024 | .input_entry = ICMP_MIB_INSRCQUENCHS, | |
1025 | .handler = icmp_unreach, | |
1026 | .error = 1, | |
1027 | }, | |
1028 | [ICMP_REDIRECT] = { | |
1029 | .output_entry = ICMP_MIB_OUTREDIRECTS, | |
1030 | .input_entry = ICMP_MIB_INREDIRECTS, | |
1031 | .handler = icmp_redirect, | |
1032 | .error = 1, | |
1033 | }, | |
1034 | [6] = { | |
1035 | .output_entry = ICMP_MIB_DUMMY, | |
1036 | .input_entry = ICMP_MIB_INERRORS, | |
1037 | .handler = icmp_discard, | |
1038 | .error = 1, | |
1039 | }, | |
1040 | [7] = { | |
1041 | .output_entry = ICMP_MIB_DUMMY, | |
1042 | .input_entry = ICMP_MIB_INERRORS, | |
1043 | .handler = icmp_discard, | |
1044 | .error = 1, | |
1045 | }, | |
1046 | [ICMP_ECHO] = { | |
1047 | .output_entry = ICMP_MIB_OUTECHOS, | |
1048 | .input_entry = ICMP_MIB_INECHOS, | |
1049 | .handler = icmp_echo, | |
1050 | }, | |
1051 | [9] = { | |
1052 | .output_entry = ICMP_MIB_DUMMY, | |
1053 | .input_entry = ICMP_MIB_INERRORS, | |
1054 | .handler = icmp_discard, | |
1055 | .error = 1, | |
1056 | }, | |
1057 | [10] = { | |
1058 | .output_entry = ICMP_MIB_DUMMY, | |
1059 | .input_entry = ICMP_MIB_INERRORS, | |
1060 | .handler = icmp_discard, | |
1061 | .error = 1, | |
1062 | }, | |
1063 | [ICMP_TIME_EXCEEDED] = { | |
1064 | .output_entry = ICMP_MIB_OUTTIMEEXCDS, | |
1065 | .input_entry = ICMP_MIB_INTIMEEXCDS, | |
1066 | .handler = icmp_unreach, | |
1067 | .error = 1, | |
1068 | }, | |
1069 | [ICMP_PARAMETERPROB] = { | |
1070 | .output_entry = ICMP_MIB_OUTPARMPROBS, | |
1071 | .input_entry = ICMP_MIB_INPARMPROBS, | |
1072 | .handler = icmp_unreach, | |
1073 | .error = 1, | |
1074 | }, | |
1075 | [ICMP_TIMESTAMP] = { | |
1076 | .output_entry = ICMP_MIB_OUTTIMESTAMPS, | |
1077 | .input_entry = ICMP_MIB_INTIMESTAMPS, | |
1078 | .handler = icmp_timestamp, | |
1079 | }, | |
1080 | [ICMP_TIMESTAMPREPLY] = { | |
1081 | .output_entry = ICMP_MIB_OUTTIMESTAMPREPS, | |
1082 | .input_entry = ICMP_MIB_INTIMESTAMPREPS, | |
1083 | .handler = icmp_discard, | |
1084 | }, | |
1085 | [ICMP_INFO_REQUEST] = { | |
1086 | .output_entry = ICMP_MIB_DUMMY, | |
1087 | .input_entry = ICMP_MIB_DUMMY, | |
1088 | .handler = icmp_discard, | |
1089 | }, | |
1090 | [ICMP_INFO_REPLY] = { | |
1091 | .output_entry = ICMP_MIB_DUMMY, | |
1092 | .input_entry = ICMP_MIB_DUMMY, | |
1093 | .handler = icmp_discard, | |
1094 | }, | |
1095 | [ICMP_ADDRESS] = { | |
1096 | .output_entry = ICMP_MIB_OUTADDRMASKS, | |
1097 | .input_entry = ICMP_MIB_INADDRMASKS, | |
1098 | .handler = icmp_address, | |
1099 | }, | |
1100 | [ICMP_ADDRESSREPLY] = { | |
1101 | .output_entry = ICMP_MIB_OUTADDRMASKREPS, | |
1102 | .input_entry = ICMP_MIB_INADDRMASKREPS, | |
1103 | .handler = icmp_address_reply, | |
1104 | }, | |
1105 | }; | |
1106 | ||
1107 | void __init icmp_init(struct net_proto_family *ops) | |
1108 | { | |
1109 | struct inet_sock *inet; | |
1110 | int i; | |
1111 | ||
670c02c2 | 1112 | for_each_cpu(i) { |
1da177e4 LT |
1113 | int err; |
1114 | ||
1da177e4 LT |
1115 | err = sock_create_kern(PF_INET, SOCK_RAW, IPPROTO_ICMP, |
1116 | &per_cpu(__icmp_socket, i)); | |
1117 | ||
1118 | if (err < 0) | |
1119 | panic("Failed to create the ICMP control socket.\n"); | |
1120 | ||
1121 | per_cpu(__icmp_socket, i)->sk->sk_allocation = GFP_ATOMIC; | |
1122 | ||
1123 | /* Enough space for 2 64K ICMP packets, including | |
1124 | * sk_buff struct overhead. | |
1125 | */ | |
1126 | per_cpu(__icmp_socket, i)->sk->sk_sndbuf = | |
1127 | (2 * ((64 * 1024) + sizeof(struct sk_buff))); | |
1128 | ||
1129 | inet = inet_sk(per_cpu(__icmp_socket, i)->sk); | |
1130 | inet->uc_ttl = -1; | |
1131 | inet->pmtudisc = IP_PMTUDISC_DONT; | |
1132 | ||
1133 | /* Unhash it so that IP input processing does not even | |
1134 | * see it, we do not wish this socket to see incoming | |
1135 | * packets. | |
1136 | */ | |
1137 | per_cpu(__icmp_socket, i)->sk->sk_prot->unhash(per_cpu(__icmp_socket, i)->sk); | |
1138 | } | |
1139 | } | |
1140 | ||
1141 | EXPORT_SYMBOL(icmp_err_convert); | |
1142 | EXPORT_SYMBOL(icmp_send); | |
1143 | EXPORT_SYMBOL(icmp_statistics); | |
1144 | EXPORT_SYMBOL(xrlim_allow); |