Commit | Line | Data |
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8ae0e4b4 | 1 | /* |
0ebd7d37 | 2 | * Copyright (c) 1982, 1986, 1988 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 | * |
89369b13 | 17 | * @(#)ip_icmp.c 7.8.1.3 (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 BJ |
38 | |
39 | /* | |
40 | * ICMP routines: error generation, receive packet processing, and | |
41 | * routines to turnaround packets back to the originator, and | |
42 | * host table maintenance routines. | |
43 | */ | |
7a372964 | 44 | #ifdef ICMPPRINTFS |
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)) |
b4dc7708 | 76 | goto freeit; |
99fca325 | 77 | if (oip->ip_p == IPPROTO_ICMP && type != ICMP_REDIRECT && |
0ebd7d37 | 78 | dtom(oip)->m_len >= oiplen + ICMP_MINLEN && |
9a63a2be | 79 | n->m_len >= oiplen + ICMP_MINLEN && |
99fca325 | 80 | !ICMP_INFOTYPE(((struct icmp *)((caddr_t)oip + oiplen))->icmp_type)) { |
7b66c1fd | 81 | icmpstat.icps_oldicmp++; |
b4dc7708 | 82 | goto freeit; |
7b66c1fd | 83 | } |
81a36a8d BJ |
84 | |
85 | /* | |
72e4f44e | 86 | * First, formulate icmp message |
81a36a8d | 87 | */ |
9d91b170 | 88 | m = m_gethdr(M_DONTWAIT, MT_HEADER); |
7b66c1fd | 89 | if (m == NULL) |
b4dc7708 | 90 | goto freeit; |
9d91b170 | 91 | icmplen = oiplen + min(8, oip->ip_len); |
f22d98c3 | 92 | m->m_len = icmplen + ICMP_MINLEN; |
9d91b170 | 93 | MH_ALIGN(m, m->m_len); |
72e4f44e | 94 | icp = mtod(m, struct icmp *); |
f22d98c3 | 95 | if ((u_int)type > ICMP_MAXTYPE) |
7b66c1fd SL |
96 | panic("icmp_error"); |
97 | icmpstat.icps_outhist[type]++; | |
81a36a8d | 98 | icp->icmp_type = type; |
f22d98c3 MK |
99 | if (type == ICMP_REDIRECT) |
100 | icp->icmp_gwaddr = dest; | |
101 | else | |
102 | icp->icmp_void = 0; | |
81a36a8d | 103 | if (type == ICMP_PARAMPROB) { |
81a36a8d | 104 | icp->icmp_pptr = code; |
72e4f44e SL |
105 | code = 0; |
106 | } | |
107 | icp->icmp_code = code; | |
f22d98c3 | 108 | bcopy((caddr_t)oip, (caddr_t)&icp->icmp_ip, icmplen); |
39674d5f | 109 | nip = &icp->icmp_ip; |
9d91b170 | 110 | nip->ip_len = htons((u_short)(nip->ip_len + oiplen)); |
81a36a8d BJ |
111 | |
112 | /* | |
9a63a2be MK |
113 | * Now, copy old ip header (without options) |
114 | * in front of icmp message. | |
81a36a8d | 115 | */ |
9a63a2be | 116 | if (m->m_data - sizeof(struct ip) < m->m_pktdat) |
f22d98c3 | 117 | panic("icmp len"); |
9a63a2be MK |
118 | m->m_data -= sizeof(struct ip); |
119 | m->m_len += sizeof(struct ip); | |
9d91b170 MK |
120 | m->m_pkthdr.len = m->m_len; |
121 | m->m_pkthdr.rcvif = n->m_pkthdr.rcvif; | |
72e4f44e SL |
122 | nip = mtod(m, struct ip *); |
123 | bcopy((caddr_t)oip, (caddr_t)nip, oiplen); | |
76a1d7bb | 124 | nip->ip_len = m->m_len; |
9a63a2be | 125 | nip->ip_hl = sizeof(struct ip) >> 2; |
0ebd7d37 | 126 | nip->ip_hl = sizeof(struct ip) >> 2; |
72e4f44e | 127 | nip->ip_p = IPPROTO_ICMP; |
9d91b170 | 128 | icmp_reflect(m); |
81a36a8d | 129 | |
b4dc7708 | 130 | freeit: |
9d91b170 | 131 | m_freem(n); |
81a36a8d BJ |
132 | } |
133 | ||
72e4f44e | 134 | static struct sockproto icmproto = { AF_INET, IPPROTO_ICMP }; |
9a63a2be MK |
135 | static struct sockaddr_in icmpsrc = { sizeof (struct sockaddr_in), AF_INET }; |
136 | static struct sockaddr_in icmpdst = { sizeof (struct sockaddr_in), AF_INET }; | |
137 | static struct sockaddr_in icmpgw = { sizeof (struct sockaddr_in), AF_INET }; | |
138 | struct sockaddr_in icmpmask = { 8, 0 }; | |
f22d98c3 | 139 | struct in_ifaddr *ifptoia(); |
72e4f44e | 140 | |
81a36a8d | 141 | /* |
d52566dd | 142 | * Process a received ICMP message. |
81a36a8d | 143 | */ |
9d91b170 | 144 | icmp_input(m, hlen) |
166e6158 | 145 | register struct mbuf *m; |
9d91b170 | 146 | int hlen; |
81a36a8d | 147 | { |
81a36a8d | 148 | register struct icmp *icp; |
d52566dd | 149 | register struct ip *ip = mtod(m, struct ip *); |
9d91b170 | 150 | int icmplen = ip->ip_len; |
8046f415 | 151 | register int i; |
f22d98c3 | 152 | struct in_ifaddr *ia; |
8046f415 | 153 | int (*ctlfunc)(), code; |
b454c3ea | 154 | extern u_char ip_protox[]; |
c175a1bd | 155 | extern struct in_addr in_makeaddr(); |
81a36a8d BJ |
156 | |
157 | /* | |
158 | * Locate icmp structure in mbuf, and check | |
159 | * that not corrupted and of at least minimum length. | |
160 | */ | |
a60889ab | 161 | #ifdef ICMPPRINTFS |
39674d5f SL |
162 | if (icmpprintfs) |
163 | printf("icmp_input from %x, len %d\n", ip->ip_src, icmplen); | |
a60889ab | 164 | #endif |
4d75f980 | 165 | if (icmplen < ICMP_MINLEN) { |
7b66c1fd | 166 | icmpstat.icps_tooshort++; |
b4dc7708 | 167 | goto freeit; |
7b66c1fd | 168 | } |
f22d98c3 | 169 | i = hlen + MIN(icmplen, ICMP_ADVLENMIN); |
9d91b170 | 170 | if (m->m_len < i && (m = m_pullup(m, i)) == 0) { |
167351c2 MK |
171 | icmpstat.icps_tooshort++; |
172 | return; | |
173 | } | |
8046f415 | 174 | ip = mtod(m, struct ip *); |
81a36a8d | 175 | m->m_len -= hlen; |
9d91b170 | 176 | m->m_data += hlen; |
72e4f44e | 177 | icp = mtod(m, struct icmp *); |
8046f415 | 178 | if (in_cksum(m, icmplen)) { |
7b66c1fd | 179 | icmpstat.icps_checksum++; |
b4dc7708 | 180 | goto freeit; |
72e4f44e | 181 | } |
76a1d7bb | 182 | m->m_len += hlen; |
9d91b170 | 183 | m->m_data -= hlen; |
81a36a8d | 184 | |
a60889ab | 185 | #ifdef ICMPPRINTFS |
81a36a8d BJ |
186 | /* |
187 | * Message type specific processing. | |
188 | */ | |
39674d5f SL |
189 | if (icmpprintfs) |
190 | printf("icmp_input, type %d code %d\n", icp->icmp_type, | |
a60889ab KM |
191 | icp->icmp_code); |
192 | #endif | |
f22d98c3 | 193 | if (icp->icmp_type > ICMP_MAXTYPE) |
166e6158 | 194 | goto raw; |
7b66c1fd | 195 | icmpstat.icps_inhist[icp->icmp_type]++; |
a60889ab | 196 | code = icp->icmp_code; |
7b66c1fd | 197 | switch (icp->icmp_type) { |
81a36a8d BJ |
198 | |
199 | case ICMP_UNREACH: | |
a60889ab KM |
200 | if (code > 5) |
201 | goto badcode; | |
202 | code += PRC_UNREACH_NET; | |
203 | goto deliver; | |
204 | ||
81a36a8d | 205 | case ICMP_TIMXCEED: |
a60889ab KM |
206 | if (code > 1) |
207 | goto badcode; | |
208 | code += PRC_TIMXCEED_INTRANS; | |
209 | goto deliver; | |
210 | ||
81a36a8d | 211 | case ICMP_PARAMPROB: |
a60889ab KM |
212 | if (code) |
213 | goto badcode; | |
214 | code = PRC_PARAMPROB; | |
215 | goto deliver; | |
216 | ||
72e4f44e | 217 | case ICMP_SOURCEQUENCH: |
a60889ab KM |
218 | if (code) |
219 | goto badcode; | |
220 | code = PRC_QUENCH; | |
221 | deliver: | |
81a36a8d | 222 | /* |
a60889ab | 223 | * Problem with datagram; advise higher level routines. |
81a36a8d | 224 | */ |
a1edc12b | 225 | icp->icmp_ip.ip_len = ntohs((u_short)icp->icmp_ip.ip_len); |
7b66c1fd SL |
226 | if (icmplen < ICMP_ADVLENMIN || icmplen < ICMP_ADVLEN(icp)) { |
227 | icmpstat.icps_badlen++; | |
b4dc7708 | 228 | goto freeit; |
7b66c1fd | 229 | } |
a60889ab | 230 | #ifdef ICMPPRINTFS |
39674d5f SL |
231 | if (icmpprintfs) |
232 | printf("deliver to protocol %d\n", icp->icmp_ip.ip_p); | |
a60889ab | 233 | #endif |
f22d98c3 | 234 | icmpsrc.sin_addr = icp->icmp_ip.ip_dst; |
59965020 | 235 | if (ctlfunc = inetsw[ip_protox[icp->icmp_ip.ip_p]].pr_ctlinput) |
f22d98c3 | 236 | (*ctlfunc)(code, (struct sockaddr *)&icmpsrc); |
76a1d7bb | 237 | break; |
a60889ab KM |
238 | |
239 | badcode: | |
240 | icmpstat.icps_badcode++; | |
76a1d7bb | 241 | break; |
81a36a8d BJ |
242 | |
243 | case ICMP_ECHO: | |
244 | icp->icmp_type = ICMP_ECHOREPLY; | |
245 | goto reflect; | |
246 | ||
247 | case ICMP_TSTAMP: | |
7b66c1fd SL |
248 | if (icmplen < ICMP_TSLEN) { |
249 | icmpstat.icps_badlen++; | |
76a1d7bb | 250 | break; |
7b66c1fd | 251 | } |
81a36a8d | 252 | icp->icmp_type = ICMP_TSTAMPREPLY; |
2b4b57cd | 253 | icp->icmp_rtime = iptime(); |
81a36a8d BJ |
254 | icp->icmp_ttime = icp->icmp_rtime; /* bogus, do later! */ |
255 | goto reflect; | |
256 | ||
257 | case ICMP_IREQ: | |
c175a1bd | 258 | #define satosin(sa) ((struct sockaddr_in *)(sa)) |
9d91b170 MK |
259 | if (in_netof(ip->ip_src) == 0 && |
260 | (ia = ifptoia(m->m_pkthdr.rcvif))) | |
f22d98c3 | 261 | ip->ip_src = in_makeaddr(in_netof(IA_SIN(ia)->sin_addr), |
c175a1bd MK |
262 | in_lnaof(ip->ip_src)); |
263 | icp->icmp_type = ICMP_IREQREPLY; | |
81a36a8d BJ |
264 | goto reflect; |
265 | ||
f22d98c3 | 266 | case ICMP_MASKREQ: |
9d91b170 MK |
267 | if (icmplen < ICMP_MASKLEN || |
268 | (ia = ifptoia(m->m_pkthdr.rcvif)) == 0) | |
76a1d7bb | 269 | break; |
9b8941dc | 270 | icp->icmp_type = ICMP_MASKREPLY; |
9a63a2be | 271 | icp->icmp_mask = ia->ia_sockmask.sin_addr.s_addr; |
f22d98c3 MK |
272 | if (ip->ip_src.s_addr == 0) { |
273 | if (ia->ia_ifp->if_flags & IFF_BROADCAST) | |
274 | ip->ip_src = satosin(&ia->ia_broadaddr)->sin_addr; | |
275 | else if (ia->ia_ifp->if_flags & IFF_POINTOPOINT) | |
276 | ip->ip_src = satosin(&ia->ia_dstaddr)->sin_addr; | |
277 | } | |
76a1d7bb MK |
278 | reflect: |
279 | ip->ip_len += hlen; /* since ip_input deducts this */ | |
280 | icmpstat.icps_reflect++; | |
281 | icmpstat.icps_outhist[icp->icmp_type]++; | |
9d91b170 | 282 | icmp_reflect(m); |
76a1d7bb | 283 | return; |
f22d98c3 | 284 | |
a469458a | 285 | case ICMP_REDIRECT: |
7b66c1fd SL |
286 | if (icmplen < ICMP_ADVLENMIN || icmplen < ICMP_ADVLEN(icp)) { |
287 | icmpstat.icps_badlen++; | |
76a1d7bb | 288 | break; |
7b66c1fd | 289 | } |
a469458a SL |
290 | /* |
291 | * Short circuit routing redirects to force | |
292 | * immediate change in the kernel's routing | |
293 | * tables. The message is also handed to anyone | |
294 | * listening on a raw socket (e.g. the routing | |
fbc81152 | 295 | * daemon for use in updating its tables). |
a469458a | 296 | */ |
f22d98c3 | 297 | icmpgw.sin_addr = ip->ip_src; |
167351c2 | 298 | icmpdst.sin_addr = icp->icmp_gwaddr; |
f22d98c3 MK |
299 | #ifdef ICMPPRINTFS |
300 | if (icmpprintfs) | |
301 | printf("redirect dst %x to %x\n", icp->icmp_ip.ip_dst, | |
302 | icp->icmp_gwaddr); | |
303 | #endif | |
fbc81152 | 304 | if (code == ICMP_REDIRECT_NET || code == ICMP_REDIRECT_TOSNET) { |
9a63a2be | 305 | u_long in_netof(); |
fbc81152 | 306 | icmpsrc.sin_addr = |
c175a1bd | 307 | in_makeaddr(in_netof(icp->icmp_ip.ip_dst), INADDR_ANY); |
7a372964 | 308 | in_sockmaskof(icp->icmp_ip.ip_dst, &icmpmask); |
fbc81152 | 309 | rtredirect((struct sockaddr *)&icmpsrc, |
9a63a2be MK |
310 | (struct sockaddr *)&icmpdst, |
311 | (struct sockaddr *)&icmpmask, RTF_GATEWAY, | |
b4dc7708 | 312 | (struct sockaddr *)&icmpgw, (struct rtentry **)0); |
166e6158 | 313 | icmpsrc.sin_addr = icp->icmp_ip.ip_dst; |
f22d98c3 MK |
314 | pfctlinput(PRC_REDIRECT_NET, |
315 | (struct sockaddr *)&icmpsrc); | |
fbc81152 MK |
316 | } else { |
317 | icmpsrc.sin_addr = icp->icmp_ip.ip_dst; | |
318 | rtredirect((struct sockaddr *)&icmpsrc, | |
9a63a2be MK |
319 | (struct sockaddr *)&icmpdst, |
320 | (struct sockaddr *)0, RTF_GATEWAY | RTF_HOST, | |
b4dc7708 | 321 | (struct sockaddr *)&icmpgw, (struct rtentry **)0); |
f22d98c3 MK |
322 | pfctlinput(PRC_REDIRECT_HOST, |
323 | (struct sockaddr *)&icmpsrc); | |
fbc81152 | 324 | } |
76a1d7bb | 325 | break; |
167351c2 | 326 | |
76a1d7bb MK |
327 | /* |
328 | * No kernel processing for the following; | |
329 | * just fall through to send to raw listener. | |
330 | */ | |
167351c2 MK |
331 | case ICMP_ECHOREPLY: |
332 | case ICMP_TSTAMPREPLY: | |
333 | case ICMP_IREQREPLY: | |
f22d98c3 | 334 | case ICMP_MASKREPLY: |
81a36a8d | 335 | default: |
76a1d7bb | 336 | break; |
81a36a8d | 337 | } |
76a1d7bb | 338 | |
166e6158 | 339 | raw: |
76a1d7bb MK |
340 | icmpsrc.sin_addr = ip->ip_src; |
341 | icmpdst.sin_addr = ip->ip_dst; | |
342 | raw_input(m, &icmproto, (struct sockaddr *)&icmpsrc, | |
343 | (struct sockaddr *)&icmpdst); | |
af8f6a21 | 344 | return; |
76a1d7bb | 345 | |
b4dc7708 | 346 | freeit: |
76a1d7bb | 347 | m_freem(m); |
81a36a8d BJ |
348 | } |
349 | ||
350 | /* | |
351 | * Reflect the ip packet back to the source | |
352 | */ | |
9d91b170 MK |
353 | icmp_reflect(m) |
354 | struct mbuf *m; | |
81a36a8d | 355 | { |
9d91b170 | 356 | register struct ip *ip = mtod(m, struct ip *); |
c175a1bd | 357 | register struct in_ifaddr *ia; |
f22d98c3 | 358 | struct in_addr t; |
5ba846a2 | 359 | struct mbuf *opts = 0, *ip_srcroute(); |
76a1d7bb | 360 | int optlen = (ip->ip_hl << 2) - sizeof(struct ip); |
81a36a8d | 361 | |
72e4f44e SL |
362 | t = ip->ip_dst; |
363 | ip->ip_dst = ip->ip_src; | |
f22d98c3 MK |
364 | /* |
365 | * If the incoming packet was addressed directly to us, | |
366 | * use dst as the src for the reply. Otherwise (broadcast | |
367 | * or anonymous), use the address which corresponds | |
368 | * to the incoming interface. | |
369 | */ | |
370 | for (ia = in_ifaddr; ia; ia = ia->ia_next) { | |
371 | if (t.s_addr == IA_SIN(ia)->sin_addr.s_addr) | |
372 | break; | |
373 | if ((ia->ia_ifp->if_flags & IFF_BROADCAST) && | |
374 | t.s_addr == satosin(&ia->ia_broadaddr)->sin_addr.s_addr) | |
375 | break; | |
376 | } | |
377 | if (ia == (struct in_ifaddr *)0) | |
9d91b170 | 378 | ia = ifptoia(m->m_pkthdr.rcvif); |
76751082 MK |
379 | if (ia == (struct in_ifaddr *)0) |
380 | ia = in_ifaddr; | |
381 | t = IA_SIN(ia)->sin_addr; | |
72e4f44e | 382 | ip->ip_src = t; |
2bc7b126 | 383 | ip->ip_ttl = MAXTTL; |
f22d98c3 | 384 | |
76a1d7bb | 385 | if (optlen > 0) { |
9a63a2be | 386 | register u_char *cp; |
89369b13 | 387 | struct mbuf *m = dtom(ip); |
9a63a2be MK |
388 | int opt, cnt, off; |
389 | u_int len; | |
390 | ||
0ebd7d37 | 391 | register u_char *cp; |
b4dc7708 | 392 | int opt, cnt; |
0ebd7d37 MK |
393 | u_int len; |
394 | ||
cd86d39a | 395 | /* |
9a63a2be MK |
396 | * Retrieve any source routing from the incoming packet; |
397 | * add on any record-route or timestamp options. | |
cd86d39a | 398 | */ |
9a63a2be | 399 | cp = (u_char *) (ip + 1); |
7a372964 MK |
400 | if ((opts = ip_srcroute()) == 0 && |
401 | (opts = m_gethdr(M_DONTWAIT, MT_HEADER))) { | |
402 | opts->m_len = sizeof(struct in_addr); | |
403 | mtod(opts, struct in_addr *)->s_addr = 0; | |
404 | } | |
405 | if (opts) { | |
406 | #ifdef ICMPPRINTFS | |
407 | if (icmpprintfs) | |
408 | printf("icmp_reflect optlen %d rt %d => ", | |
409 | optlen, opts->m_len); | |
410 | #endif | |
9a63a2be | 411 | for (cnt = optlen; cnt > 0; cnt -= len, cp += len) { |
7a372964 MK |
412 | opt = cp[IPOPT_OPTVAL]; |
413 | if (opt == IPOPT_EOL) | |
414 | break; | |
415 | if (opt == IPOPT_NOP) | |
416 | len = 1; | |
417 | else { | |
418 | len = cp[IPOPT_OLEN]; | |
419 | if (len <= 0 || len > cnt) | |
420 | break; | |
421 | } | |
422 | /* | |
423 | * should check for overflow, but it "can't happen" | |
424 | */ | |
425 | if (opt == IPOPT_RR || opt == IPOPT_TS) { | |
426 | bcopy((caddr_t)cp, | |
427 | mtod(opts, caddr_t) + opts->m_len, len); | |
428 | opts->m_len += len; | |
429 | } | |
430 | } | |
431 | if (opts->m_len % 4 != 0) { | |
432 | *(mtod(opts, caddr_t) + opts->m_len) = IPOPT_EOL; | |
433 | opts->m_len++; | |
434 | } | |
435 | #ifdef ICMPPRINTFS | |
436 | if (icmpprintfs) | |
437 | printf("%d\n", opts->m_len); | |
438 | #endif | |
9a63a2be | 439 | } |
7a372964 MK |
440 | /* |
441 | * Now strip out original options by copying rest of first | |
442 | * mbuf's data back, and adjust the IP length. | |
443 | */ | |
9a63a2be MK |
444 | ip->ip_len -= optlen; |
445 | ip->ip_hl = sizeof(struct ip) >> 2; | |
7a372964 | 446 | m->m_len -= optlen; |
9d91b170 MK |
447 | if (m->m_flags & M_PKTHDR) |
448 | m->m_pkthdr.len -= optlen; | |
7a372964 MK |
449 | optlen += sizeof(struct ip); |
450 | bcopy((caddr_t)ip + optlen, (caddr_t)(ip + 1), | |
b4dc7708 | 451 | (unsigned)(m->m_len - sizeof(struct ip))); |
f22d98c3 | 452 | } |
424b2707 | 453 | |
9d91b170 | 454 | icmp_send(m, opts); |
cd86d39a | 455 | if (opts) |
8011f5df | 456 | (void)m_free(opts); |
81a36a8d BJ |
457 | } |
458 | ||
f22d98c3 MK |
459 | struct in_ifaddr * |
460 | ifptoia(ifp) | |
461 | struct ifnet *ifp; | |
462 | { | |
463 | register struct in_ifaddr *ia; | |
464 | ||
465 | for (ia = in_ifaddr; ia; ia = ia->ia_next) | |
466 | if (ia->ia_ifp == ifp) | |
467 | return (ia); | |
468 | return ((struct in_ifaddr *)0); | |
469 | } | |
470 | ||
81a36a8d | 471 | /* |
72e4f44e SL |
472 | * Send an icmp packet back to the ip level, |
473 | * after supplying a checksum. | |
81a36a8d | 474 | */ |
9d91b170 MK |
475 | icmp_send(m, opts) |
476 | register struct mbuf *m; | |
cd86d39a | 477 | struct mbuf *opts; |
81a36a8d | 478 | { |
9d91b170 | 479 | register struct ip *ip = mtod(m, struct ip *); |
af8f6a21 | 480 | register int hlen; |
72e4f44e | 481 | register struct icmp *icp; |
d52566dd | 482 | |
af8f6a21 | 483 | hlen = ip->ip_hl << 2; |
9d91b170 | 484 | m->m_data += hlen; |
76a1d7bb | 485 | m->m_len -= hlen; |
72e4f44e SL |
486 | icp = mtod(m, struct icmp *); |
487 | icp->icmp_cksum = 0; | |
488 | icp->icmp_cksum = in_cksum(m, ip->ip_len - hlen); | |
9d91b170 | 489 | m->m_data -= hlen; |
72e4f44e | 490 | m->m_len += hlen; |
a60889ab | 491 | #ifdef ICMPPRINTFS |
39674d5f SL |
492 | if (icmpprintfs) |
493 | printf("icmp_send dst %x src %x\n", ip->ip_dst, ip->ip_src); | |
a60889ab | 494 | #endif |
cd86d39a | 495 | (void) ip_output(m, opts, (struct route *)0, 0); |
d52566dd BJ |
496 | } |
497 | ||
cdad2eb1 | 498 | n_time |
2b4b57cd | 499 | iptime() |
d52566dd | 500 | { |
b3f3ec92 | 501 | struct timeval atv; |
2752c877 | 502 | u_long t; |
d52566dd | 503 | |
b3f3ec92 MK |
504 | microtime(&atv); |
505 | t = (atv.tv_sec % (24*60*60)) * 1000 + atv.tv_usec / 1000; | |
cdad2eb1 | 506 | return (htonl(t)); |
d52566dd | 507 | } |