Commit | Line | Data |
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8ae0e4b4 | 1 | /* |
0880b18e | 2 | * Copyright (c) 1982, 1986 Regents of the University of California. |
2b6b6284 | 3 | * All rights reserved. |
8ae0e4b4 | 4 | * |
2b6b6284 | 5 | * Redistribution and use in source and binary forms are permitted |
616d42db KB |
6 | * provided that the above copyright notice and this paragraph are |
7 | * duplicated in all such forms and that any documentation, | |
8 | * advertising materials, and other materials related to such | |
9 | * distribution and use acknowledge that the software was developed | |
10 | * by the University of California, Berkeley. The name of the | |
11 | * University may not be used to endorse or promote products derived | |
12 | * from this software without specific prior written permission. | |
13 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR | |
14 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED | |
15 | * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. | |
2b6b6284 | 16 | * |
9a63a2be | 17 | * @(#)ip_icmp.c 7.10 (Berkeley) %G% |
8ae0e4b4 | 18 | */ |
81a36a8d | 19 | |
20666ad3 JB |
20 | #include "param.h" |
21 | #include "systm.h" | |
9d91b170 | 22 | #include "malloc.h" |
20666ad3 JB |
23 | #include "mbuf.h" |
24 | #include "protosw.h" | |
25 | #include "socket.h" | |
26 | #include "time.h" | |
27 | #include "kernel.h" | |
6e7edb25 BJ |
28 | |
29 | #include "../net/route.h" | |
c175a1bd | 30 | #include "../net/if.h" |
f4d55810 | 31 | |
20666ad3 JB |
32 | #include "in.h" |
33 | #include "in_systm.h" | |
c175a1bd | 34 | #include "in_var.h" |
20666ad3 JB |
35 | #include "ip.h" |
36 | #include "ip_icmp.h" | |
37 | #include "icmp_var.h" | |
81a36a8d | 38 | |
a60889ab | 39 | #ifdef ICMPPRINTFS |
81a36a8d BJ |
40 | /* |
41 | * ICMP routines: error generation, receive packet processing, and | |
42 | * routines to turnaround packets back to the originator, and | |
43 | * host table maintenance routines. | |
44 | */ | |
67387c9c | 45 | int icmpprintfs = 0; |
a60889ab | 46 | #endif |
81a36a8d BJ |
47 | |
48 | /* | |
72e4f44e SL |
49 | * Generate an error packet of type error |
50 | * in response to bad packet ip. | |
81a36a8d | 51 | */ |
9d91b170 MK |
52 | /*VARARGS3*/ |
53 | icmp_error(n, type, code, dest) | |
54 | struct mbuf *n; | |
755d8841 | 55 | int type, code; |
f22d98c3 | 56 | struct in_addr dest; |
81a36a8d | 57 | { |
9d91b170 | 58 | register struct ip *oip = mtod(n, struct ip *), *nip; |
72e4f44e SL |
59 | register unsigned oiplen = oip->ip_hl << 2; |
60 | register struct icmp *icp; | |
9d91b170 | 61 | register struct mbuf *m; |
8011f5df | 62 | unsigned icmplen; |
81a36a8d | 63 | |
a60889ab | 64 | #ifdef ICMPPRINTFS |
39674d5f SL |
65 | if (icmpprintfs) |
66 | printf("icmp_error(%x, %d, %d)\n", oip, type, code); | |
a60889ab | 67 | #endif |
cd86d39a MK |
68 | if (type != ICMP_REDIRECT) |
69 | icmpstat.icps_error++; | |
81a36a8d | 70 | /* |
f22d98c3 | 71 | * Don't send error if not the first fragment of message. |
99fca325 MK |
72 | * Don't error if the old packet protocol was ICMP |
73 | * error message, only known informational types. | |
81a36a8d | 74 | */ |
f22d98c3 | 75 | if (oip->ip_off &~ (IP_MF|IP_DF)) |
81a36a8d | 76 | goto free; |
99fca325 | 77 | if (oip->ip_p == IPPROTO_ICMP && type != ICMP_REDIRECT && |
9a63a2be | 78 | n->m_len >= oiplen + ICMP_MINLEN && |
99fca325 | 79 | !ICMP_INFOTYPE(((struct icmp *)((caddr_t)oip + oiplen))->icmp_type)) { |
7b66c1fd SL |
80 | icmpstat.icps_oldicmp++; |
81 | goto free; | |
82 | } | |
81a36a8d BJ |
83 | |
84 | /* | |
72e4f44e | 85 | * First, formulate icmp message |
81a36a8d | 86 | */ |
9d91b170 | 87 | m = m_gethdr(M_DONTWAIT, MT_HEADER); |
7b66c1fd | 88 | if (m == NULL) |
81a36a8d | 89 | goto free; |
9d91b170 | 90 | icmplen = oiplen + min(8, oip->ip_len); |
f22d98c3 | 91 | m->m_len = icmplen + ICMP_MINLEN; |
9d91b170 | 92 | MH_ALIGN(m, m->m_len); |
72e4f44e | 93 | icp = mtod(m, struct icmp *); |
f22d98c3 | 94 | if ((u_int)type > ICMP_MAXTYPE) |
7b66c1fd SL |
95 | panic("icmp_error"); |
96 | icmpstat.icps_outhist[type]++; | |
81a36a8d | 97 | icp->icmp_type = type; |
f22d98c3 MK |
98 | if (type == ICMP_REDIRECT) |
99 | icp->icmp_gwaddr = dest; | |
100 | else | |
101 | icp->icmp_void = 0; | |
81a36a8d | 102 | if (type == ICMP_PARAMPROB) { |
81a36a8d | 103 | icp->icmp_pptr = code; |
72e4f44e SL |
104 | code = 0; |
105 | } | |
106 | icp->icmp_code = code; | |
f22d98c3 | 107 | bcopy((caddr_t)oip, (caddr_t)&icp->icmp_ip, icmplen); |
39674d5f | 108 | nip = &icp->icmp_ip; |
9d91b170 | 109 | nip->ip_len = htons((u_short)(nip->ip_len + oiplen)); |
81a36a8d BJ |
110 | |
111 | /* | |
9a63a2be MK |
112 | * Now, copy old ip header (without options) |
113 | * in front of icmp message. | |
81a36a8d | 114 | */ |
9a63a2be | 115 | if (m->m_data - sizeof(struct ip) < m->m_pktdat) |
f22d98c3 | 116 | panic("icmp len"); |
9a63a2be MK |
117 | m->m_data -= sizeof(struct ip); |
118 | m->m_len += sizeof(struct ip); | |
9d91b170 MK |
119 | m->m_pkthdr.len = m->m_len; |
120 | m->m_pkthdr.rcvif = n->m_pkthdr.rcvif; | |
72e4f44e SL |
121 | nip = mtod(m, struct ip *); |
122 | bcopy((caddr_t)oip, (caddr_t)nip, oiplen); | |
76a1d7bb | 123 | nip->ip_len = m->m_len; |
9a63a2be | 124 | nip->ip_hl = sizeof(struct ip) >> 2; |
72e4f44e | 125 | nip->ip_p = IPPROTO_ICMP; |
9d91b170 | 126 | icmp_reflect(m); |
81a36a8d | 127 | |
def04636 | 128 | free: |
9d91b170 | 129 | m_freem(n); |
81a36a8d BJ |
130 | } |
131 | ||
72e4f44e | 132 | static struct sockproto icmproto = { AF_INET, IPPROTO_ICMP }; |
9a63a2be MK |
133 | static struct sockaddr_in icmpsrc = { sizeof (struct sockaddr_in), AF_INET }; |
134 | static struct sockaddr_in icmpdst = { sizeof (struct sockaddr_in), AF_INET }; | |
135 | static struct sockaddr_in icmpgw = { sizeof (struct sockaddr_in), AF_INET }; | |
136 | struct sockaddr_in icmpmask = { 8, 0 }; | |
f22d98c3 | 137 | struct in_ifaddr *ifptoia(); |
72e4f44e | 138 | |
81a36a8d | 139 | /* |
d52566dd | 140 | * Process a received ICMP message. |
81a36a8d | 141 | */ |
9d91b170 | 142 | icmp_input(m, hlen) |
166e6158 | 143 | register struct mbuf *m; |
9d91b170 | 144 | int hlen; |
81a36a8d | 145 | { |
81a36a8d | 146 | register struct icmp *icp; |
d52566dd | 147 | register struct ip *ip = mtod(m, struct ip *); |
9d91b170 | 148 | int icmplen = ip->ip_len; |
8046f415 | 149 | register int i; |
f22d98c3 | 150 | struct in_ifaddr *ia; |
8046f415 | 151 | int (*ctlfunc)(), code; |
b454c3ea | 152 | extern u_char ip_protox[]; |
c175a1bd | 153 | extern struct in_addr in_makeaddr(); |
81a36a8d BJ |
154 | |
155 | /* | |
156 | * Locate icmp structure in mbuf, and check | |
157 | * that not corrupted and of at least minimum length. | |
158 | */ | |
a60889ab | 159 | #ifdef ICMPPRINTFS |
39674d5f SL |
160 | if (icmpprintfs) |
161 | printf("icmp_input from %x, len %d\n", ip->ip_src, icmplen); | |
a60889ab | 162 | #endif |
4d75f980 | 163 | if (icmplen < ICMP_MINLEN) { |
7b66c1fd | 164 | icmpstat.icps_tooshort++; |
72e4f44e | 165 | goto free; |
7b66c1fd | 166 | } |
f22d98c3 | 167 | i = hlen + MIN(icmplen, ICMP_ADVLENMIN); |
9d91b170 | 168 | if (m->m_len < i && (m = m_pullup(m, i)) == 0) { |
167351c2 MK |
169 | icmpstat.icps_tooshort++; |
170 | return; | |
171 | } | |
8046f415 | 172 | ip = mtod(m, struct ip *); |
81a36a8d | 173 | m->m_len -= hlen; |
9d91b170 | 174 | m->m_data += hlen; |
72e4f44e | 175 | icp = mtod(m, struct icmp *); |
8046f415 | 176 | if (in_cksum(m, icmplen)) { |
7b66c1fd | 177 | icmpstat.icps_checksum++; |
d52566dd | 178 | goto free; |
72e4f44e | 179 | } |
76a1d7bb | 180 | m->m_len += hlen; |
9d91b170 | 181 | m->m_data -= hlen; |
81a36a8d | 182 | |
a60889ab | 183 | #ifdef ICMPPRINTFS |
81a36a8d BJ |
184 | /* |
185 | * Message type specific processing. | |
186 | */ | |
39674d5f SL |
187 | if (icmpprintfs) |
188 | printf("icmp_input, type %d code %d\n", icp->icmp_type, | |
a60889ab KM |
189 | icp->icmp_code); |
190 | #endif | |
f22d98c3 | 191 | if (icp->icmp_type > ICMP_MAXTYPE) |
166e6158 | 192 | goto raw; |
7b66c1fd | 193 | icmpstat.icps_inhist[icp->icmp_type]++; |
a60889ab | 194 | code = icp->icmp_code; |
7b66c1fd | 195 | switch (icp->icmp_type) { |
81a36a8d BJ |
196 | |
197 | case ICMP_UNREACH: | |
a60889ab KM |
198 | if (code > 5) |
199 | goto badcode; | |
200 | code += PRC_UNREACH_NET; | |
201 | goto deliver; | |
202 | ||
81a36a8d | 203 | case ICMP_TIMXCEED: |
a60889ab KM |
204 | if (code > 1) |
205 | goto badcode; | |
206 | code += PRC_TIMXCEED_INTRANS; | |
207 | goto deliver; | |
208 | ||
81a36a8d | 209 | case ICMP_PARAMPROB: |
a60889ab KM |
210 | if (code) |
211 | goto badcode; | |
212 | code = PRC_PARAMPROB; | |
213 | goto deliver; | |
214 | ||
72e4f44e | 215 | case ICMP_SOURCEQUENCH: |
a60889ab KM |
216 | if (code) |
217 | goto badcode; | |
218 | code = PRC_QUENCH; | |
219 | deliver: | |
81a36a8d | 220 | /* |
a60889ab | 221 | * Problem with datagram; advise higher level routines. |
81a36a8d | 222 | */ |
a1edc12b | 223 | icp->icmp_ip.ip_len = ntohs((u_short)icp->icmp_ip.ip_len); |
7b66c1fd SL |
224 | if (icmplen < ICMP_ADVLENMIN || icmplen < ICMP_ADVLEN(icp)) { |
225 | icmpstat.icps_badlen++; | |
d52566dd | 226 | goto free; |
7b66c1fd | 227 | } |
a60889ab | 228 | #ifdef ICMPPRINTFS |
39674d5f SL |
229 | if (icmpprintfs) |
230 | printf("deliver to protocol %d\n", icp->icmp_ip.ip_p); | |
a60889ab | 231 | #endif |
f22d98c3 | 232 | icmpsrc.sin_addr = icp->icmp_ip.ip_dst; |
59965020 | 233 | if (ctlfunc = inetsw[ip_protox[icp->icmp_ip.ip_p]].pr_ctlinput) |
f22d98c3 | 234 | (*ctlfunc)(code, (struct sockaddr *)&icmpsrc); |
76a1d7bb | 235 | break; |
a60889ab KM |
236 | |
237 | badcode: | |
238 | icmpstat.icps_badcode++; | |
76a1d7bb | 239 | break; |
81a36a8d BJ |
240 | |
241 | case ICMP_ECHO: | |
242 | icp->icmp_type = ICMP_ECHOREPLY; | |
243 | goto reflect; | |
244 | ||
245 | case ICMP_TSTAMP: | |
7b66c1fd SL |
246 | if (icmplen < ICMP_TSLEN) { |
247 | icmpstat.icps_badlen++; | |
76a1d7bb | 248 | break; |
7b66c1fd | 249 | } |
81a36a8d | 250 | icp->icmp_type = ICMP_TSTAMPREPLY; |
2b4b57cd | 251 | icp->icmp_rtime = iptime(); |
81a36a8d BJ |
252 | icp->icmp_ttime = icp->icmp_rtime; /* bogus, do later! */ |
253 | goto reflect; | |
254 | ||
255 | case ICMP_IREQ: | |
c175a1bd | 256 | #define satosin(sa) ((struct sockaddr_in *)(sa)) |
9d91b170 MK |
257 | if (in_netof(ip->ip_src) == 0 && |
258 | (ia = ifptoia(m->m_pkthdr.rcvif))) | |
f22d98c3 | 259 | ip->ip_src = in_makeaddr(in_netof(IA_SIN(ia)->sin_addr), |
c175a1bd MK |
260 | in_lnaof(ip->ip_src)); |
261 | icp->icmp_type = ICMP_IREQREPLY; | |
81a36a8d BJ |
262 | goto reflect; |
263 | ||
f22d98c3 | 264 | case ICMP_MASKREQ: |
9d91b170 MK |
265 | if (icmplen < ICMP_MASKLEN || |
266 | (ia = ifptoia(m->m_pkthdr.rcvif)) == 0) | |
76a1d7bb | 267 | break; |
9b8941dc | 268 | icp->icmp_type = ICMP_MASKREPLY; |
9a63a2be | 269 | icp->icmp_mask = ia->ia_sockmask.sin_addr.s_addr; |
f22d98c3 MK |
270 | if (ip->ip_src.s_addr == 0) { |
271 | if (ia->ia_ifp->if_flags & IFF_BROADCAST) | |
272 | ip->ip_src = satosin(&ia->ia_broadaddr)->sin_addr; | |
273 | else if (ia->ia_ifp->if_flags & IFF_POINTOPOINT) | |
274 | ip->ip_src = satosin(&ia->ia_dstaddr)->sin_addr; | |
275 | } | |
76a1d7bb MK |
276 | reflect: |
277 | ip->ip_len += hlen; /* since ip_input deducts this */ | |
278 | icmpstat.icps_reflect++; | |
279 | icmpstat.icps_outhist[icp->icmp_type]++; | |
9d91b170 | 280 | icmp_reflect(m); |
76a1d7bb | 281 | return; |
f22d98c3 | 282 | |
a469458a | 283 | case ICMP_REDIRECT: |
7b66c1fd SL |
284 | if (icmplen < ICMP_ADVLENMIN || icmplen < ICMP_ADVLEN(icp)) { |
285 | icmpstat.icps_badlen++; | |
76a1d7bb | 286 | break; |
7b66c1fd | 287 | } |
a469458a SL |
288 | /* |
289 | * Short circuit routing redirects to force | |
290 | * immediate change in the kernel's routing | |
291 | * tables. The message is also handed to anyone | |
292 | * listening on a raw socket (e.g. the routing | |
fbc81152 | 293 | * daemon for use in updating its tables). |
a469458a | 294 | */ |
f22d98c3 | 295 | icmpgw.sin_addr = ip->ip_src; |
167351c2 | 296 | icmpdst.sin_addr = icp->icmp_gwaddr; |
f22d98c3 MK |
297 | #ifdef ICMPPRINTFS |
298 | if (icmpprintfs) | |
299 | printf("redirect dst %x to %x\n", icp->icmp_ip.ip_dst, | |
300 | icp->icmp_gwaddr); | |
301 | #endif | |
fbc81152 | 302 | if (code == ICMP_REDIRECT_NET || code == ICMP_REDIRECT_TOSNET) { |
9a63a2be | 303 | u_long in_netof(); |
fbc81152 | 304 | icmpsrc.sin_addr = |
c175a1bd | 305 | in_makeaddr(in_netof(icp->icmp_ip.ip_dst), INADDR_ANY); |
9a63a2be MK |
306 | icmpmask.sin_addr.s_addr = |
307 | in_maskof(icp->icmp_ip.ip_dst); | |
fbc81152 | 308 | rtredirect((struct sockaddr *)&icmpsrc, |
9a63a2be MK |
309 | (struct sockaddr *)&icmpdst, |
310 | (struct sockaddr *)&icmpmask, RTF_GATEWAY, | |
f22d98c3 | 311 | (struct sockaddr *)&icmpgw); |
166e6158 | 312 | icmpsrc.sin_addr = icp->icmp_ip.ip_dst; |
f22d98c3 MK |
313 | pfctlinput(PRC_REDIRECT_NET, |
314 | (struct sockaddr *)&icmpsrc); | |
fbc81152 MK |
315 | } else { |
316 | icmpsrc.sin_addr = icp->icmp_ip.ip_dst; | |
317 | rtredirect((struct sockaddr *)&icmpsrc, | |
9a63a2be MK |
318 | (struct sockaddr *)&icmpdst, |
319 | (struct sockaddr *)0, RTF_GATEWAY | RTF_HOST, | |
f22d98c3 MK |
320 | (struct sockaddr *)&icmpgw); |
321 | pfctlinput(PRC_REDIRECT_HOST, | |
322 | (struct sockaddr *)&icmpsrc); | |
fbc81152 | 323 | } |
76a1d7bb | 324 | break; |
167351c2 | 325 | |
76a1d7bb MK |
326 | /* |
327 | * No kernel processing for the following; | |
328 | * just fall through to send to raw listener. | |
329 | */ | |
167351c2 MK |
330 | case ICMP_ECHOREPLY: |
331 | case ICMP_TSTAMPREPLY: | |
332 | case ICMP_IREQREPLY: | |
f22d98c3 | 333 | case ICMP_MASKREPLY: |
81a36a8d | 334 | default: |
76a1d7bb | 335 | break; |
81a36a8d | 336 | } |
76a1d7bb | 337 | |
166e6158 | 338 | raw: |
76a1d7bb MK |
339 | icmpsrc.sin_addr = ip->ip_src; |
340 | icmpdst.sin_addr = ip->ip_dst; | |
341 | raw_input(m, &icmproto, (struct sockaddr *)&icmpsrc, | |
342 | (struct sockaddr *)&icmpdst); | |
af8f6a21 | 343 | return; |
76a1d7bb | 344 | |
81a36a8d | 345 | free: |
76a1d7bb | 346 | m_freem(m); |
81a36a8d BJ |
347 | } |
348 | ||
349 | /* | |
350 | * Reflect the ip packet back to the source | |
351 | */ | |
9d91b170 MK |
352 | icmp_reflect(m) |
353 | struct mbuf *m; | |
81a36a8d | 354 | { |
9d91b170 | 355 | register struct ip *ip = mtod(m, struct ip *); |
c175a1bd | 356 | register struct in_ifaddr *ia; |
f22d98c3 | 357 | struct in_addr t; |
5ba846a2 | 358 | struct mbuf *opts = 0, *ip_srcroute(); |
76a1d7bb | 359 | int optlen = (ip->ip_hl << 2) - sizeof(struct ip); |
81a36a8d | 360 | |
72e4f44e SL |
361 | t = ip->ip_dst; |
362 | ip->ip_dst = ip->ip_src; | |
f22d98c3 MK |
363 | /* |
364 | * If the incoming packet was addressed directly to us, | |
365 | * use dst as the src for the reply. Otherwise (broadcast | |
366 | * or anonymous), use the address which corresponds | |
367 | * to the incoming interface. | |
368 | */ | |
369 | for (ia = in_ifaddr; ia; ia = ia->ia_next) { | |
370 | if (t.s_addr == IA_SIN(ia)->sin_addr.s_addr) | |
371 | break; | |
372 | if ((ia->ia_ifp->if_flags & IFF_BROADCAST) && | |
373 | t.s_addr == satosin(&ia->ia_broadaddr)->sin_addr.s_addr) | |
374 | break; | |
375 | } | |
376 | if (ia == (struct in_ifaddr *)0) | |
9d91b170 | 377 | ia = ifptoia(m->m_pkthdr.rcvif); |
76751082 MK |
378 | if (ia == (struct in_ifaddr *)0) |
379 | ia = in_ifaddr; | |
380 | t = IA_SIN(ia)->sin_addr; | |
72e4f44e | 381 | ip->ip_src = t; |
2bc7b126 | 382 | ip->ip_ttl = MAXTTL; |
f22d98c3 | 383 | |
76a1d7bb | 384 | if (optlen > 0) { |
9a63a2be MK |
385 | register u_char *cp; |
386 | int opt, cnt, off; | |
387 | u_int len; | |
388 | ||
cd86d39a | 389 | /* |
9a63a2be MK |
390 | * Retrieve any source routing from the incoming packet; |
391 | * add on any record-route or timestamp options. | |
392 | * Strip out original options. Adjust the IP length. | |
cd86d39a | 393 | */ |
9a63a2be MK |
394 | cp = (u_char *) (ip + 1); |
395 | if (opts = ip_srcroute()) | |
396 | for (cnt = optlen; cnt > 0; cnt -= len, cp += len) { | |
397 | opt = cp[IPOPT_OPTVAL]; | |
398 | if (opt == IPOPT_EOL) | |
399 | break; | |
400 | if (opt == IPOPT_NOP) | |
401 | len = 1; | |
402 | else { | |
403 | len = cp[IPOPT_OLEN]; | |
404 | if (len <= 0 || len > cnt) | |
405 | break; | |
406 | } | |
407 | /* should check for overflow, but it "can't happen" */ | |
408 | if (opt == IPOPT_RR || opt == IPOPT_TS) { | |
409 | bcopy((caddr_t)cp, | |
410 | mtod(opts, caddr_t) + opts->m_len, len); | |
411 | opts->m_len += len; | |
412 | } | |
413 | } | |
414 | ovbcopy((caddr_t)ip, (caddr_t)ip + optlen, sizeof(struct ip)); | |
415 | m->m_data += optlen; | |
9d91b170 | 416 | m->m_len -= optlen; |
9a63a2be MK |
417 | ip = mtod(m, struct ip *); |
418 | ip->ip_len -= optlen; | |
419 | ip->ip_hl = sizeof(struct ip) >> 2; | |
9d91b170 MK |
420 | if (m->m_flags & M_PKTHDR) |
421 | m->m_pkthdr.len -= optlen; | |
f22d98c3 | 422 | } |
9d91b170 | 423 | icmp_send(m, opts); |
cd86d39a | 424 | if (opts) |
8011f5df | 425 | (void)m_free(opts); |
81a36a8d BJ |
426 | } |
427 | ||
f22d98c3 MK |
428 | struct in_ifaddr * |
429 | ifptoia(ifp) | |
430 | struct ifnet *ifp; | |
431 | { | |
432 | register struct in_ifaddr *ia; | |
433 | ||
434 | for (ia = in_ifaddr; ia; ia = ia->ia_next) | |
435 | if (ia->ia_ifp == ifp) | |
436 | return (ia); | |
437 | return ((struct in_ifaddr *)0); | |
438 | } | |
439 | ||
81a36a8d | 440 | /* |
72e4f44e SL |
441 | * Send an icmp packet back to the ip level, |
442 | * after supplying a checksum. | |
81a36a8d | 443 | */ |
9d91b170 MK |
444 | icmp_send(m, opts) |
445 | register struct mbuf *m; | |
cd86d39a | 446 | struct mbuf *opts; |
81a36a8d | 447 | { |
9d91b170 | 448 | register struct ip *ip = mtod(m, struct ip *); |
af8f6a21 | 449 | register int hlen; |
72e4f44e | 450 | register struct icmp *icp; |
d52566dd | 451 | |
af8f6a21 | 452 | hlen = ip->ip_hl << 2; |
9d91b170 | 453 | m->m_data += hlen; |
76a1d7bb | 454 | m->m_len -= hlen; |
72e4f44e SL |
455 | icp = mtod(m, struct icmp *); |
456 | icp->icmp_cksum = 0; | |
457 | icp->icmp_cksum = in_cksum(m, ip->ip_len - hlen); | |
9d91b170 | 458 | m->m_data -= hlen; |
72e4f44e | 459 | m->m_len += hlen; |
a60889ab | 460 | #ifdef ICMPPRINTFS |
39674d5f SL |
461 | if (icmpprintfs) |
462 | printf("icmp_send dst %x src %x\n", ip->ip_dst, ip->ip_src); | |
a60889ab | 463 | #endif |
cd86d39a | 464 | (void) ip_output(m, opts, (struct route *)0, 0); |
d52566dd BJ |
465 | } |
466 | ||
cdad2eb1 | 467 | n_time |
2b4b57cd | 468 | iptime() |
d52566dd | 469 | { |
b3f3ec92 | 470 | struct timeval atv; |
2752c877 | 471 | u_long t; |
d52566dd | 472 | |
b3f3ec92 MK |
473 | microtime(&atv); |
474 | t = (atv.tv_sec % (24*60*60)) * 1000 + atv.tv_usec / 1000; | |
cdad2eb1 | 475 | return (htonl(t)); |
d52566dd | 476 | } |