Commit | Line | Data |
---|---|---|
8ae0e4b4 | 1 | /* |
0ebd7d37 | 2 | * Copyright (c) 1982, 1986, 1988 Regents of the University of California. |
2b6b6284 | 3 | * All rights reserved. |
8ae0e4b4 | 4 | * |
dbf0c423 | 5 | * %sccs.include.redist.c% |
2b6b6284 | 6 | * |
dbf0c423 | 7 | * @(#)ip_icmp.c 7.14 (Berkeley) %G% |
8ae0e4b4 | 8 | */ |
81a36a8d | 9 | |
20666ad3 JB |
10 | #include "param.h" |
11 | #include "systm.h" | |
9d91b170 | 12 | #include "malloc.h" |
20666ad3 JB |
13 | #include "mbuf.h" |
14 | #include "protosw.h" | |
15 | #include "socket.h" | |
16 | #include "time.h" | |
17 | #include "kernel.h" | |
6e7edb25 BJ |
18 | |
19 | #include "../net/route.h" | |
c175a1bd | 20 | #include "../net/if.h" |
f4d55810 | 21 | |
20666ad3 JB |
22 | #include "in.h" |
23 | #include "in_systm.h" | |
c175a1bd | 24 | #include "in_var.h" |
20666ad3 JB |
25 | #include "ip.h" |
26 | #include "ip_icmp.h" | |
27 | #include "icmp_var.h" | |
81a36a8d BJ |
28 | |
29 | /* | |
30 | * ICMP routines: error generation, receive packet processing, and | |
31 | * routines to turnaround packets back to the originator, and | |
32 | * host table maintenance routines. | |
33 | */ | |
7a372964 | 34 | #ifdef ICMPPRINTFS |
67387c9c | 35 | int icmpprintfs = 0; |
a60889ab | 36 | #endif |
81a36a8d BJ |
37 | |
38 | /* | |
72e4f44e SL |
39 | * Generate an error packet of type error |
40 | * in response to bad packet ip. | |
81a36a8d | 41 | */ |
9d91b170 MK |
42 | /*VARARGS3*/ |
43 | icmp_error(n, type, code, dest) | |
44 | struct mbuf *n; | |
755d8841 | 45 | int type, code; |
f22d98c3 | 46 | struct in_addr dest; |
81a36a8d | 47 | { |
9d91b170 | 48 | register struct ip *oip = mtod(n, struct ip *), *nip; |
72e4f44e SL |
49 | register unsigned oiplen = oip->ip_hl << 2; |
50 | register struct icmp *icp; | |
9d91b170 | 51 | register struct mbuf *m; |
8011f5df | 52 | unsigned icmplen; |
81a36a8d | 53 | |
a60889ab | 54 | #ifdef ICMPPRINTFS |
39674d5f SL |
55 | if (icmpprintfs) |
56 | printf("icmp_error(%x, %d, %d)\n", oip, type, code); | |
a60889ab | 57 | #endif |
cd86d39a MK |
58 | if (type != ICMP_REDIRECT) |
59 | icmpstat.icps_error++; | |
81a36a8d | 60 | /* |
f22d98c3 | 61 | * Don't send error if not the first fragment of message. |
99fca325 MK |
62 | * Don't error if the old packet protocol was ICMP |
63 | * error message, only known informational types. | |
81a36a8d | 64 | */ |
f22d98c3 | 65 | if (oip->ip_off &~ (IP_MF|IP_DF)) |
b4dc7708 | 66 | goto freeit; |
99fca325 | 67 | if (oip->ip_p == IPPROTO_ICMP && type != ICMP_REDIRECT && |
0ebd7d37 | 68 | dtom(oip)->m_len >= oiplen + ICMP_MINLEN && |
9a63a2be | 69 | n->m_len >= oiplen + ICMP_MINLEN && |
99fca325 | 70 | !ICMP_INFOTYPE(((struct icmp *)((caddr_t)oip + oiplen))->icmp_type)) { |
7b66c1fd | 71 | icmpstat.icps_oldicmp++; |
b4dc7708 | 72 | goto freeit; |
7b66c1fd | 73 | } |
81a36a8d BJ |
74 | |
75 | /* | |
72e4f44e | 76 | * First, formulate icmp message |
81a36a8d | 77 | */ |
9d91b170 | 78 | m = m_gethdr(M_DONTWAIT, MT_HEADER); |
7b66c1fd | 79 | if (m == NULL) |
b4dc7708 | 80 | goto freeit; |
9d91b170 | 81 | icmplen = oiplen + min(8, oip->ip_len); |
f22d98c3 | 82 | m->m_len = icmplen + ICMP_MINLEN; |
9d91b170 | 83 | MH_ALIGN(m, m->m_len); |
72e4f44e | 84 | icp = mtod(m, struct icmp *); |
f22d98c3 | 85 | if ((u_int)type > ICMP_MAXTYPE) |
7b66c1fd SL |
86 | panic("icmp_error"); |
87 | icmpstat.icps_outhist[type]++; | |
81a36a8d | 88 | icp->icmp_type = type; |
f22d98c3 MK |
89 | if (type == ICMP_REDIRECT) |
90 | icp->icmp_gwaddr = dest; | |
91 | else | |
92 | icp->icmp_void = 0; | |
81a36a8d | 93 | if (type == ICMP_PARAMPROB) { |
81a36a8d | 94 | icp->icmp_pptr = code; |
72e4f44e SL |
95 | code = 0; |
96 | } | |
97 | icp->icmp_code = code; | |
f22d98c3 | 98 | bcopy((caddr_t)oip, (caddr_t)&icp->icmp_ip, icmplen); |
39674d5f | 99 | nip = &icp->icmp_ip; |
9d91b170 | 100 | nip->ip_len = htons((u_short)(nip->ip_len + oiplen)); |
81a36a8d BJ |
101 | |
102 | /* | |
9a63a2be MK |
103 | * Now, copy old ip header (without options) |
104 | * in front of icmp message. | |
81a36a8d | 105 | */ |
9a63a2be | 106 | if (m->m_data - sizeof(struct ip) < m->m_pktdat) |
f22d98c3 | 107 | panic("icmp len"); |
9a63a2be MK |
108 | m->m_data -= sizeof(struct ip); |
109 | m->m_len += sizeof(struct ip); | |
9d91b170 MK |
110 | m->m_pkthdr.len = m->m_len; |
111 | m->m_pkthdr.rcvif = n->m_pkthdr.rcvif; | |
72e4f44e SL |
112 | nip = mtod(m, struct ip *); |
113 | bcopy((caddr_t)oip, (caddr_t)nip, oiplen); | |
76a1d7bb | 114 | nip->ip_len = m->m_len; |
9a63a2be | 115 | nip->ip_hl = sizeof(struct ip) >> 2; |
0ebd7d37 | 116 | nip->ip_hl = sizeof(struct ip) >> 2; |
72e4f44e | 117 | nip->ip_p = IPPROTO_ICMP; |
9d91b170 | 118 | icmp_reflect(m); |
81a36a8d | 119 | |
b4dc7708 | 120 | freeit: |
9d91b170 | 121 | m_freem(n); |
81a36a8d BJ |
122 | } |
123 | ||
72e4f44e | 124 | static struct sockproto icmproto = { AF_INET, IPPROTO_ICMP }; |
9a63a2be MK |
125 | static struct sockaddr_in icmpsrc = { sizeof (struct sockaddr_in), AF_INET }; |
126 | static struct sockaddr_in icmpdst = { sizeof (struct sockaddr_in), AF_INET }; | |
127 | static struct sockaddr_in icmpgw = { sizeof (struct sockaddr_in), AF_INET }; | |
128 | struct sockaddr_in icmpmask = { 8, 0 }; | |
f22d98c3 | 129 | struct in_ifaddr *ifptoia(); |
72e4f44e | 130 | |
81a36a8d | 131 | /* |
d52566dd | 132 | * Process a received ICMP message. |
81a36a8d | 133 | */ |
9d91b170 | 134 | icmp_input(m, hlen) |
166e6158 | 135 | register struct mbuf *m; |
9d91b170 | 136 | int hlen; |
81a36a8d | 137 | { |
81a36a8d | 138 | register struct icmp *icp; |
d52566dd | 139 | register struct ip *ip = mtod(m, struct ip *); |
9d91b170 | 140 | int icmplen = ip->ip_len; |
8046f415 | 141 | register int i; |
f22d98c3 | 142 | struct in_ifaddr *ia; |
8046f415 | 143 | int (*ctlfunc)(), code; |
b454c3ea | 144 | extern u_char ip_protox[]; |
c175a1bd | 145 | extern struct in_addr in_makeaddr(); |
81a36a8d BJ |
146 | |
147 | /* | |
148 | * Locate icmp structure in mbuf, and check | |
149 | * that not corrupted and of at least minimum length. | |
150 | */ | |
a60889ab | 151 | #ifdef ICMPPRINTFS |
39674d5f SL |
152 | if (icmpprintfs) |
153 | printf("icmp_input from %x, len %d\n", ip->ip_src, icmplen); | |
a60889ab | 154 | #endif |
4d75f980 | 155 | if (icmplen < ICMP_MINLEN) { |
7b66c1fd | 156 | icmpstat.icps_tooshort++; |
b4dc7708 | 157 | goto freeit; |
7b66c1fd | 158 | } |
f22d98c3 | 159 | i = hlen + MIN(icmplen, ICMP_ADVLENMIN); |
9d91b170 | 160 | if (m->m_len < i && (m = m_pullup(m, i)) == 0) { |
167351c2 MK |
161 | icmpstat.icps_tooshort++; |
162 | return; | |
163 | } | |
8046f415 | 164 | ip = mtod(m, struct ip *); |
81a36a8d | 165 | m->m_len -= hlen; |
9d91b170 | 166 | m->m_data += hlen; |
72e4f44e | 167 | icp = mtod(m, struct icmp *); |
8046f415 | 168 | if (in_cksum(m, icmplen)) { |
7b66c1fd | 169 | icmpstat.icps_checksum++; |
b4dc7708 | 170 | goto freeit; |
72e4f44e | 171 | } |
76a1d7bb | 172 | m->m_len += hlen; |
9d91b170 | 173 | m->m_data -= hlen; |
81a36a8d | 174 | |
a60889ab | 175 | #ifdef ICMPPRINTFS |
81a36a8d BJ |
176 | /* |
177 | * Message type specific processing. | |
178 | */ | |
39674d5f SL |
179 | if (icmpprintfs) |
180 | printf("icmp_input, type %d code %d\n", icp->icmp_type, | |
a60889ab KM |
181 | icp->icmp_code); |
182 | #endif | |
f22d98c3 | 183 | if (icp->icmp_type > ICMP_MAXTYPE) |
166e6158 | 184 | goto raw; |
7b66c1fd | 185 | icmpstat.icps_inhist[icp->icmp_type]++; |
a60889ab | 186 | code = icp->icmp_code; |
7b66c1fd | 187 | switch (icp->icmp_type) { |
81a36a8d BJ |
188 | |
189 | case ICMP_UNREACH: | |
a60889ab KM |
190 | if (code > 5) |
191 | goto badcode; | |
192 | code += PRC_UNREACH_NET; | |
193 | goto deliver; | |
194 | ||
81a36a8d | 195 | case ICMP_TIMXCEED: |
a60889ab KM |
196 | if (code > 1) |
197 | goto badcode; | |
198 | code += PRC_TIMXCEED_INTRANS; | |
199 | goto deliver; | |
200 | ||
81a36a8d | 201 | case ICMP_PARAMPROB: |
a60889ab KM |
202 | if (code) |
203 | goto badcode; | |
204 | code = PRC_PARAMPROB; | |
205 | goto deliver; | |
206 | ||
72e4f44e | 207 | case ICMP_SOURCEQUENCH: |
a60889ab KM |
208 | if (code) |
209 | goto badcode; | |
210 | code = PRC_QUENCH; | |
211 | deliver: | |
81a36a8d | 212 | /* |
a60889ab | 213 | * Problem with datagram; advise higher level routines. |
81a36a8d | 214 | */ |
3953bf11 MK |
215 | if (icmplen < ICMP_ADVLENMIN || icmplen < ICMP_ADVLEN(icp) || |
216 | icp->icmp_ip.ip_hl < (sizeof(struct ip) >> 2)) { | |
7b66c1fd | 217 | icmpstat.icps_badlen++; |
b4dc7708 | 218 | goto freeit; |
7b66c1fd | 219 | } |
3953bf11 | 220 | NTOHS(icp->icmp_ip.ip_len); |
a60889ab | 221 | #ifdef ICMPPRINTFS |
39674d5f SL |
222 | if (icmpprintfs) |
223 | printf("deliver to protocol %d\n", icp->icmp_ip.ip_p); | |
a60889ab | 224 | #endif |
f22d98c3 | 225 | icmpsrc.sin_addr = icp->icmp_ip.ip_dst; |
59965020 | 226 | if (ctlfunc = inetsw[ip_protox[icp->icmp_ip.ip_p]].pr_ctlinput) |
3953bf11 MK |
227 | (*ctlfunc)(code, (struct sockaddr *)&icmpsrc, |
228 | (caddr_t) &icp->icmp_ip); | |
76a1d7bb | 229 | break; |
a60889ab KM |
230 | |
231 | badcode: | |
232 | icmpstat.icps_badcode++; | |
76a1d7bb | 233 | break; |
81a36a8d BJ |
234 | |
235 | case ICMP_ECHO: | |
236 | icp->icmp_type = ICMP_ECHOREPLY; | |
237 | goto reflect; | |
238 | ||
239 | case ICMP_TSTAMP: | |
7b66c1fd SL |
240 | if (icmplen < ICMP_TSLEN) { |
241 | icmpstat.icps_badlen++; | |
76a1d7bb | 242 | break; |
7b66c1fd | 243 | } |
81a36a8d | 244 | icp->icmp_type = ICMP_TSTAMPREPLY; |
2b4b57cd | 245 | icp->icmp_rtime = iptime(); |
81a36a8d BJ |
246 | icp->icmp_ttime = icp->icmp_rtime; /* bogus, do later! */ |
247 | goto reflect; | |
248 | ||
249 | case ICMP_IREQ: | |
c175a1bd | 250 | #define satosin(sa) ((struct sockaddr_in *)(sa)) |
9d91b170 MK |
251 | if (in_netof(ip->ip_src) == 0 && |
252 | (ia = ifptoia(m->m_pkthdr.rcvif))) | |
f22d98c3 | 253 | ip->ip_src = in_makeaddr(in_netof(IA_SIN(ia)->sin_addr), |
c175a1bd MK |
254 | in_lnaof(ip->ip_src)); |
255 | icp->icmp_type = ICMP_IREQREPLY; | |
81a36a8d BJ |
256 | goto reflect; |
257 | ||
f22d98c3 | 258 | case ICMP_MASKREQ: |
9d91b170 MK |
259 | if (icmplen < ICMP_MASKLEN || |
260 | (ia = ifptoia(m->m_pkthdr.rcvif)) == 0) | |
76a1d7bb | 261 | break; |
9b8941dc | 262 | icp->icmp_type = ICMP_MASKREPLY; |
9a63a2be | 263 | icp->icmp_mask = ia->ia_sockmask.sin_addr.s_addr; |
f22d98c3 MK |
264 | if (ip->ip_src.s_addr == 0) { |
265 | if (ia->ia_ifp->if_flags & IFF_BROADCAST) | |
266 | ip->ip_src = satosin(&ia->ia_broadaddr)->sin_addr; | |
267 | else if (ia->ia_ifp->if_flags & IFF_POINTOPOINT) | |
268 | ip->ip_src = satosin(&ia->ia_dstaddr)->sin_addr; | |
269 | } | |
76a1d7bb MK |
270 | reflect: |
271 | ip->ip_len += hlen; /* since ip_input deducts this */ | |
272 | icmpstat.icps_reflect++; | |
273 | icmpstat.icps_outhist[icp->icmp_type]++; | |
9d91b170 | 274 | icmp_reflect(m); |
76a1d7bb | 275 | return; |
f22d98c3 | 276 | |
a469458a | 277 | case ICMP_REDIRECT: |
7b66c1fd SL |
278 | if (icmplen < ICMP_ADVLENMIN || icmplen < ICMP_ADVLEN(icp)) { |
279 | icmpstat.icps_badlen++; | |
76a1d7bb | 280 | break; |
7b66c1fd | 281 | } |
a469458a SL |
282 | /* |
283 | * Short circuit routing redirects to force | |
284 | * immediate change in the kernel's routing | |
285 | * tables. The message is also handed to anyone | |
286 | * listening on a raw socket (e.g. the routing | |
fbc81152 | 287 | * daemon for use in updating its tables). |
a469458a | 288 | */ |
f22d98c3 | 289 | icmpgw.sin_addr = ip->ip_src; |
167351c2 | 290 | icmpdst.sin_addr = icp->icmp_gwaddr; |
f22d98c3 MK |
291 | #ifdef ICMPPRINTFS |
292 | if (icmpprintfs) | |
293 | printf("redirect dst %x to %x\n", icp->icmp_ip.ip_dst, | |
294 | icp->icmp_gwaddr); | |
295 | #endif | |
fbc81152 | 296 | if (code == ICMP_REDIRECT_NET || code == ICMP_REDIRECT_TOSNET) { |
9a63a2be | 297 | u_long in_netof(); |
fbc81152 | 298 | icmpsrc.sin_addr = |
c175a1bd | 299 | in_makeaddr(in_netof(icp->icmp_ip.ip_dst), INADDR_ANY); |
7a372964 | 300 | in_sockmaskof(icp->icmp_ip.ip_dst, &icmpmask); |
fbc81152 | 301 | rtredirect((struct sockaddr *)&icmpsrc, |
9a63a2be MK |
302 | (struct sockaddr *)&icmpdst, |
303 | (struct sockaddr *)&icmpmask, RTF_GATEWAY, | |
b4dc7708 | 304 | (struct sockaddr *)&icmpgw, (struct rtentry **)0); |
166e6158 | 305 | icmpsrc.sin_addr = icp->icmp_ip.ip_dst; |
f22d98c3 MK |
306 | pfctlinput(PRC_REDIRECT_NET, |
307 | (struct sockaddr *)&icmpsrc); | |
fbc81152 MK |
308 | } else { |
309 | icmpsrc.sin_addr = icp->icmp_ip.ip_dst; | |
310 | rtredirect((struct sockaddr *)&icmpsrc, | |
9a63a2be MK |
311 | (struct sockaddr *)&icmpdst, |
312 | (struct sockaddr *)0, RTF_GATEWAY | RTF_HOST, | |
b4dc7708 | 313 | (struct sockaddr *)&icmpgw, (struct rtentry **)0); |
f22d98c3 MK |
314 | pfctlinput(PRC_REDIRECT_HOST, |
315 | (struct sockaddr *)&icmpsrc); | |
fbc81152 | 316 | } |
76a1d7bb | 317 | break; |
167351c2 | 318 | |
76a1d7bb MK |
319 | /* |
320 | * No kernel processing for the following; | |
321 | * just fall through to send to raw listener. | |
322 | */ | |
167351c2 MK |
323 | case ICMP_ECHOREPLY: |
324 | case ICMP_TSTAMPREPLY: | |
325 | case ICMP_IREQREPLY: | |
f22d98c3 | 326 | case ICMP_MASKREPLY: |
81a36a8d | 327 | default: |
76a1d7bb | 328 | break; |
81a36a8d | 329 | } |
76a1d7bb | 330 | |
166e6158 | 331 | raw: |
76a1d7bb MK |
332 | icmpsrc.sin_addr = ip->ip_src; |
333 | icmpdst.sin_addr = ip->ip_dst; | |
3953bf11 | 334 | (void) raw_input(m, &icmproto, (struct sockaddr *)&icmpsrc, |
76a1d7bb | 335 | (struct sockaddr *)&icmpdst); |
af8f6a21 | 336 | return; |
76a1d7bb | 337 | |
b4dc7708 | 338 | freeit: |
76a1d7bb | 339 | m_freem(m); |
81a36a8d BJ |
340 | } |
341 | ||
342 | /* | |
343 | * Reflect the ip packet back to the source | |
344 | */ | |
9d91b170 MK |
345 | icmp_reflect(m) |
346 | struct mbuf *m; | |
81a36a8d | 347 | { |
9d91b170 | 348 | register struct ip *ip = mtod(m, struct ip *); |
c175a1bd | 349 | register struct in_ifaddr *ia; |
f22d98c3 | 350 | struct in_addr t; |
5ba846a2 | 351 | struct mbuf *opts = 0, *ip_srcroute(); |
76a1d7bb | 352 | int optlen = (ip->ip_hl << 2) - sizeof(struct ip); |
81a36a8d | 353 | |
72e4f44e SL |
354 | t = ip->ip_dst; |
355 | ip->ip_dst = ip->ip_src; | |
f22d98c3 MK |
356 | /* |
357 | * If the incoming packet was addressed directly to us, | |
358 | * use dst as the src for the reply. Otherwise (broadcast | |
359 | * or anonymous), use the address which corresponds | |
360 | * to the incoming interface. | |
361 | */ | |
362 | for (ia = in_ifaddr; ia; ia = ia->ia_next) { | |
363 | if (t.s_addr == IA_SIN(ia)->sin_addr.s_addr) | |
364 | break; | |
365 | if ((ia->ia_ifp->if_flags & IFF_BROADCAST) && | |
366 | t.s_addr == satosin(&ia->ia_broadaddr)->sin_addr.s_addr) | |
367 | break; | |
368 | } | |
369 | if (ia == (struct in_ifaddr *)0) | |
9d91b170 | 370 | ia = ifptoia(m->m_pkthdr.rcvif); |
76751082 MK |
371 | if (ia == (struct in_ifaddr *)0) |
372 | ia = in_ifaddr; | |
373 | t = IA_SIN(ia)->sin_addr; | |
72e4f44e | 374 | ip->ip_src = t; |
2bc7b126 | 375 | ip->ip_ttl = MAXTTL; |
f22d98c3 | 376 | |
76a1d7bb | 377 | if (optlen > 0) { |
9a63a2be | 378 | register u_char *cp; |
89369b13 | 379 | struct mbuf *m = dtom(ip); |
9a63a2be MK |
380 | int opt, cnt, off; |
381 | u_int len; | |
382 | ||
0ebd7d37 | 383 | register u_char *cp; |
b4dc7708 | 384 | int opt, cnt; |
0ebd7d37 MK |
385 | u_int len; |
386 | ||
cd86d39a | 387 | /* |
9a63a2be MK |
388 | * Retrieve any source routing from the incoming packet; |
389 | * add on any record-route or timestamp options. | |
cd86d39a | 390 | */ |
9a63a2be | 391 | cp = (u_char *) (ip + 1); |
7a372964 MK |
392 | if ((opts = ip_srcroute()) == 0 && |
393 | (opts = m_gethdr(M_DONTWAIT, MT_HEADER))) { | |
394 | opts->m_len = sizeof(struct in_addr); | |
395 | mtod(opts, struct in_addr *)->s_addr = 0; | |
396 | } | |
397 | if (opts) { | |
398 | #ifdef ICMPPRINTFS | |
399 | if (icmpprintfs) | |
400 | printf("icmp_reflect optlen %d rt %d => ", | |
401 | optlen, opts->m_len); | |
402 | #endif | |
9a63a2be | 403 | for (cnt = optlen; cnt > 0; cnt -= len, cp += len) { |
7a372964 MK |
404 | opt = cp[IPOPT_OPTVAL]; |
405 | if (opt == IPOPT_EOL) | |
406 | break; | |
407 | if (opt == IPOPT_NOP) | |
408 | len = 1; | |
409 | else { | |
410 | len = cp[IPOPT_OLEN]; | |
411 | if (len <= 0 || len > cnt) | |
412 | break; | |
413 | } | |
414 | /* | |
415 | * should check for overflow, but it "can't happen" | |
416 | */ | |
417 | if (opt == IPOPT_RR || opt == IPOPT_TS) { | |
418 | bcopy((caddr_t)cp, | |
419 | mtod(opts, caddr_t) + opts->m_len, len); | |
420 | opts->m_len += len; | |
421 | } | |
422 | } | |
423 | if (opts->m_len % 4 != 0) { | |
424 | *(mtod(opts, caddr_t) + opts->m_len) = IPOPT_EOL; | |
425 | opts->m_len++; | |
426 | } | |
427 | #ifdef ICMPPRINTFS | |
428 | if (icmpprintfs) | |
429 | printf("%d\n", opts->m_len); | |
430 | #endif | |
9a63a2be | 431 | } |
7a372964 MK |
432 | /* |
433 | * Now strip out original options by copying rest of first | |
434 | * mbuf's data back, and adjust the IP length. | |
435 | */ | |
9a63a2be MK |
436 | ip->ip_len -= optlen; |
437 | ip->ip_hl = sizeof(struct ip) >> 2; | |
7a372964 | 438 | m->m_len -= optlen; |
9d91b170 MK |
439 | if (m->m_flags & M_PKTHDR) |
440 | m->m_pkthdr.len -= optlen; | |
7a372964 MK |
441 | optlen += sizeof(struct ip); |
442 | bcopy((caddr_t)ip + optlen, (caddr_t)(ip + 1), | |
b4dc7708 | 443 | (unsigned)(m->m_len - sizeof(struct ip))); |
f22d98c3 | 444 | } |
424b2707 | 445 | |
9d91b170 | 446 | icmp_send(m, opts); |
cd86d39a | 447 | if (opts) |
8011f5df | 448 | (void)m_free(opts); |
81a36a8d BJ |
449 | } |
450 | ||
f22d98c3 MK |
451 | struct in_ifaddr * |
452 | ifptoia(ifp) | |
453 | struct ifnet *ifp; | |
454 | { | |
455 | register struct in_ifaddr *ia; | |
456 | ||
457 | for (ia = in_ifaddr; ia; ia = ia->ia_next) | |
458 | if (ia->ia_ifp == ifp) | |
459 | return (ia); | |
460 | return ((struct in_ifaddr *)0); | |
461 | } | |
462 | ||
81a36a8d | 463 | /* |
72e4f44e SL |
464 | * Send an icmp packet back to the ip level, |
465 | * after supplying a checksum. | |
81a36a8d | 466 | */ |
9d91b170 MK |
467 | icmp_send(m, opts) |
468 | register struct mbuf *m; | |
cd86d39a | 469 | struct mbuf *opts; |
81a36a8d | 470 | { |
9d91b170 | 471 | register struct ip *ip = mtod(m, struct ip *); |
af8f6a21 | 472 | register int hlen; |
72e4f44e | 473 | register struct icmp *icp; |
d52566dd | 474 | |
af8f6a21 | 475 | hlen = ip->ip_hl << 2; |
9d91b170 | 476 | m->m_data += hlen; |
76a1d7bb | 477 | m->m_len -= hlen; |
72e4f44e SL |
478 | icp = mtod(m, struct icmp *); |
479 | icp->icmp_cksum = 0; | |
480 | icp->icmp_cksum = in_cksum(m, ip->ip_len - hlen); | |
9d91b170 | 481 | m->m_data -= hlen; |
72e4f44e | 482 | m->m_len += hlen; |
a60889ab | 483 | #ifdef ICMPPRINTFS |
39674d5f SL |
484 | if (icmpprintfs) |
485 | printf("icmp_send dst %x src %x\n", ip->ip_dst, ip->ip_src); | |
a60889ab | 486 | #endif |
cd86d39a | 487 | (void) ip_output(m, opts, (struct route *)0, 0); |
d52566dd BJ |
488 | } |
489 | ||
cdad2eb1 | 490 | n_time |
2b4b57cd | 491 | iptime() |
d52566dd | 492 | { |
b3f3ec92 | 493 | struct timeval atv; |
2752c877 | 494 | u_long t; |
d52566dd | 495 | |
b3f3ec92 MK |
496 | microtime(&atv); |
497 | t = (atv.tv_sec % (24*60*60)) * 1000 + atv.tv_usec / 1000; | |
cdad2eb1 | 498 | return (htonl(t)); |
d52566dd | 499 | } |