| 1 | /*
|
|---|
| 2 | * Copyright (c) 1982, 1986, 1988, 1993
|
|---|
| 3 | * The Regents of the University of California. All rights reserved.
|
|---|
| 4 | *
|
|---|
| 5 | * Redistribution and use in source and binary forms, with or without
|
|---|
| 6 | * modification, are permitted provided that the following conditions
|
|---|
| 7 | * are met:
|
|---|
| 8 | * 1. Redistributions of source code must retain the above copyright
|
|---|
| 9 | * notice, this list of conditions and the following disclaimer.
|
|---|
| 10 | * 2. Redistributions in binary form must reproduce the above copyright
|
|---|
| 11 | * notice, this list of conditions and the following disclaimer in the
|
|---|
| 12 | * documentation and/or other materials provided with the distribution.
|
|---|
| 13 | * 3. All advertising materials mentioning features or use of this software
|
|---|
| 14 | * must display the following acknowledgement:
|
|---|
| 15 | * This product includes software developed by the University of
|
|---|
| 16 | * California, Berkeley and its contributors.
|
|---|
| 17 | * 4. Neither the name of the University nor the names of its contributors
|
|---|
| 18 | * may be used to endorse or promote products derived from this software
|
|---|
| 19 | * without specific prior written permission.
|
|---|
| 20 | *
|
|---|
| 21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|---|
| 22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|---|
| 23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|---|
| 24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|---|
| 25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|---|
| 26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|---|
| 27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|---|
| 28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|---|
| 29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|---|
| 30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|---|
| 31 | * SUCH DAMAGE.
|
|---|
| 32 | *
|
|---|
| 33 | * @(#)ip_icmp.c 8.2 (Berkeley) 1/4/94
|
|---|
| 34 | * ip_icmp.c,v 1.7 1995/05/30 08:09:42 rgrimes Exp
|
|---|
| 35 | */
|
|---|
| 36 |
|
|---|
| 37 | #include "slirp.h"
|
|---|
| 38 | #include "ip_icmp.h"
|
|---|
| 39 |
|
|---|
| 40 | #ifndef VBOX
|
|---|
| 41 | struct icmpstat icmpstat;
|
|---|
| 42 | #endif /* !VBOX */
|
|---|
| 43 |
|
|---|
| 44 | /* The message sent when emulating PING */
|
|---|
| 45 | /* Be nice and tell them it's just a psuedo-ping packet */
|
|---|
| 46 | #ifdef VBOX
|
|---|
| 47 | static const char icmp_ping_msg[] = "This is a psuedo-PING packet used by Slirp to emulate ICMP ECHO-REQUEST packets.\n";
|
|---|
| 48 | #else /* !VBOX */
|
|---|
| 49 | char icmp_ping_msg[] = "This is a psuedo-PING packet used by Slirp to emulate ICMP ECHO-REQUEST packets.\n";
|
|---|
| 50 | #endif /* !VBOX */
|
|---|
| 51 |
|
|---|
| 52 | /* list of actions for icmp_error() on RX of an icmp message */
|
|---|
| 53 | #ifdef VBOX
|
|---|
| 54 | static const int icmp_flush[19] = {
|
|---|
| 55 | #else /* !VBOX */
|
|---|
| 56 | static int icmp_flush[19] = {
|
|---|
| 57 | #endif /* !VBOX */
|
|---|
| 58 | /* ECHO REPLY (0) */ 0,
|
|---|
| 59 | 1,
|
|---|
| 60 | 1,
|
|---|
| 61 | /* DEST UNREACH (3) */ 1,
|
|---|
| 62 | /* SOURCE QUENCH (4)*/ 1,
|
|---|
| 63 | /* REDIRECT (5) */ 1,
|
|---|
| 64 | 1,
|
|---|
| 65 | 1,
|
|---|
| 66 | /* ECHO (8) */ 0,
|
|---|
| 67 | /* ROUTERADVERT (9) */ 1,
|
|---|
| 68 | /* ROUTERSOLICIT (10) */ 1,
|
|---|
| 69 | /* TIME EXCEEDED (11) */ 1,
|
|---|
| 70 | /* PARAMETER PROBLEM (12) */ 1,
|
|---|
| 71 | /* TIMESTAMP (13) */ 0,
|
|---|
| 72 | /* TIMESTAMP REPLY (14) */ 0,
|
|---|
| 73 | /* INFO (15) */ 0,
|
|---|
| 74 | /* INFO REPLY (16) */ 0,
|
|---|
| 75 | /* ADDR MASK (17) */ 0,
|
|---|
| 76 | /* ADDR MASK REPLY (18) */ 0
|
|---|
| 77 | };
|
|---|
| 78 |
|
|---|
| 79 | /*
|
|---|
| 80 | * Process a received ICMP message.
|
|---|
| 81 | */
|
|---|
| 82 | void
|
|---|
| 83 | #ifdef VBOX
|
|---|
| 84 | icmp_input(PNATState pData, struct mbuf *m, int hlen)
|
|---|
| 85 | #else /* !VBOX */
|
|---|
| 86 | icmp_input(m, hlen)
|
|---|
| 87 | struct mbuf *m;
|
|---|
| 88 | int hlen;
|
|---|
| 89 | #endif /* !VBOX */
|
|---|
| 90 | {
|
|---|
| 91 | register struct icmp *icp;
|
|---|
| 92 | register struct ip *ip=mtod(m, struct ip *);
|
|---|
| 93 | int icmplen=ip->ip_len;
|
|---|
| 94 | /* int code; */
|
|---|
| 95 |
|
|---|
| 96 | DEBUG_CALL("icmp_input");
|
|---|
| 97 | DEBUG_ARG("m = %lx", (long )m);
|
|---|
| 98 | DEBUG_ARG("m_len = %d", m->m_len);
|
|---|
| 99 |
|
|---|
| 100 | icmpstat.icps_received++;
|
|---|
| 101 |
|
|---|
| 102 | /*
|
|---|
| 103 | * Locate icmp structure in mbuf, and check
|
|---|
| 104 | * that its not corrupted and of at least minimum length.
|
|---|
| 105 | */
|
|---|
| 106 | if (icmplen < ICMP_MINLEN) { /* min 8 bytes payload */
|
|---|
| 107 | icmpstat.icps_tooshort++;
|
|---|
| 108 | freeit:
|
|---|
| 109 | #ifdef VBOX
|
|---|
| 110 | m_freem(pData, m);
|
|---|
| 111 | #else /* !VBOX */
|
|---|
| 112 | m_freem(m);
|
|---|
| 113 | #endif /* !VBOX */
|
|---|
| 114 | goto end_error;
|
|---|
| 115 | }
|
|---|
| 116 |
|
|---|
| 117 | m->m_len -= hlen;
|
|---|
| 118 | m->m_data += hlen;
|
|---|
| 119 | icp = mtod(m, struct icmp *);
|
|---|
| 120 | if (cksum(m, icmplen)) {
|
|---|
| 121 | icmpstat.icps_checksum++;
|
|---|
| 122 | goto freeit;
|
|---|
| 123 | }
|
|---|
| 124 | m->m_len += hlen;
|
|---|
| 125 | m->m_data -= hlen;
|
|---|
| 126 |
|
|---|
| 127 | /* icmpstat.icps_inhist[icp->icmp_type]++; */
|
|---|
| 128 | /* code = icp->icmp_code; */
|
|---|
| 129 |
|
|---|
| 130 | DEBUG_ARG("icmp_type = %d", icp->icmp_type);
|
|---|
| 131 | switch (icp->icmp_type) {
|
|---|
| 132 | case ICMP_ECHO:
|
|---|
| 133 | icp->icmp_type = ICMP_ECHOREPLY;
|
|---|
| 134 | ip->ip_len += hlen; /* since ip_input subtracts this */
|
|---|
| 135 | if (ip->ip_dst.s_addr == alias_addr.s_addr) {
|
|---|
| 136 | #ifdef VBOX
|
|---|
| 137 | icmp_reflect(pData, m);
|
|---|
| 138 | #else /* !VBOX */
|
|---|
| 139 | icmp_reflect(m);
|
|---|
| 140 | #endif /* !VBOX */
|
|---|
| 141 | } else {
|
|---|
| 142 | struct socket *so;
|
|---|
| 143 | struct sockaddr_in addr;
|
|---|
| 144 | if ((so = socreate()) == NULL) goto freeit;
|
|---|
| 145 | #ifdef VBOX
|
|---|
| 146 | if(udp_attach(pData, so) == -1) {
|
|---|
| 147 | #else /* !VBOX */
|
|---|
| 148 | if(udp_attach(so) == -1) {
|
|---|
| 149 | #endif /* !VBOX */
|
|---|
| 150 | DEBUG_MISC((dfd,"icmp_input udp_attach errno = %d-%s\n",
|
|---|
| 151 | errno,strerror(errno)));
|
|---|
| 152 | #ifdef VBOX
|
|---|
| 153 | sofree(pData, so);
|
|---|
| 154 | m_free(pData, m);
|
|---|
| 155 | #else /* !VBOX */
|
|---|
| 156 | sofree(so);
|
|---|
| 157 | m_free(m);
|
|---|
| 158 | #endif /* !VBOX */
|
|---|
| 159 | goto end_error;
|
|---|
| 160 | }
|
|---|
| 161 | so->so_m = m;
|
|---|
| 162 | so->so_faddr = ip->ip_dst;
|
|---|
| 163 | so->so_fport = htons(7);
|
|---|
| 164 | so->so_laddr = ip->ip_src;
|
|---|
| 165 | so->so_lport = htons(9);
|
|---|
| 166 | so->so_iptos = ip->ip_tos;
|
|---|
| 167 | so->so_type = IPPROTO_ICMP;
|
|---|
| 168 | so->so_state = SS_ISFCONNECTED;
|
|---|
| 169 |
|
|---|
| 170 | /* Send the packet */
|
|---|
| 171 | addr.sin_family = AF_INET;
|
|---|
| 172 | if ((so->so_faddr.s_addr & htonl(0xffffff00)) == special_addr.s_addr) {
|
|---|
| 173 | /* It's an alias */
|
|---|
| 174 | switch(ntohl(so->so_faddr.s_addr) & 0xff) {
|
|---|
| 175 | case CTL_DNS:
|
|---|
| 176 | addr.sin_addr = dns_addr;
|
|---|
| 177 | break;
|
|---|
| 178 | case CTL_ALIAS:
|
|---|
| 179 | default:
|
|---|
| 180 | addr.sin_addr = loopback_addr;
|
|---|
| 181 | break;
|
|---|
| 182 | }
|
|---|
| 183 | } else {
|
|---|
| 184 | addr.sin_addr = so->so_faddr;
|
|---|
| 185 | }
|
|---|
| 186 | addr.sin_port = so->so_fport;
|
|---|
| 187 | if(sendto(so->s, icmp_ping_msg, strlen(icmp_ping_msg), 0,
|
|---|
| 188 | (struct sockaddr *)&addr, sizeof(addr)) == -1) {
|
|---|
| 189 | DEBUG_MISC((dfd,"icmp_input udp sendto tx errno = %d-%s\n",
|
|---|
| 190 | errno,strerror(errno)));
|
|---|
| 191 | #ifdef VBOX
|
|---|
| 192 | icmp_error(pData, m, ICMP_UNREACH,ICMP_UNREACH_NET, 0,strerror(errno));
|
|---|
| 193 | udp_detach(pData, so);
|
|---|
| 194 | #else /* !VBOX */
|
|---|
| 195 | icmp_error(m, ICMP_UNREACH,ICMP_UNREACH_NET, 0,strerror(errno));
|
|---|
| 196 | udp_detach(so);
|
|---|
| 197 | #endif /* !VBOX */
|
|---|
| 198 | }
|
|---|
| 199 | } /* if ip->ip_dst.s_addr == alias_addr.s_addr */
|
|---|
| 200 | break;
|
|---|
| 201 | case ICMP_UNREACH:
|
|---|
| 202 | /* XXX? report error? close socket? */
|
|---|
| 203 | case ICMP_TIMXCEED:
|
|---|
| 204 | case ICMP_PARAMPROB:
|
|---|
| 205 | case ICMP_SOURCEQUENCH:
|
|---|
| 206 | case ICMP_TSTAMP:
|
|---|
| 207 | case ICMP_MASKREQ:
|
|---|
| 208 | case ICMP_REDIRECT:
|
|---|
| 209 | icmpstat.icps_notsupp++;
|
|---|
| 210 | #ifdef VBOX
|
|---|
| 211 | m_freem(pData, m);
|
|---|
| 212 | #else /* !VBOX */
|
|---|
| 213 | m_freem(m);
|
|---|
| 214 | #endif /* !VBOX */
|
|---|
| 215 | break;
|
|---|
| 216 |
|
|---|
| 217 | default:
|
|---|
| 218 | icmpstat.icps_badtype++;
|
|---|
| 219 | #ifdef VBOX
|
|---|
| 220 | m_freem(pData, m);
|
|---|
| 221 | #else /* !VBOX */
|
|---|
| 222 | m_freem(m);
|
|---|
| 223 | #endif /* !VBOX */
|
|---|
| 224 | } /* swith */
|
|---|
| 225 |
|
|---|
| 226 | end_error:
|
|---|
| 227 | /* m is m_free()'d xor put in a socket xor or given to ip_send */
|
|---|
| 228 | return;
|
|---|
| 229 | }
|
|---|
| 230 |
|
|---|
| 231 |
|
|---|
| 232 | /*
|
|---|
| 233 | * Send an ICMP message in response to a situation
|
|---|
| 234 | *
|
|---|
| 235 | * RFC 1122: 3.2.2 MUST send at least the IP header and 8 bytes of header. MAY send more (we do).
|
|---|
| 236 | * MUST NOT change this header information.
|
|---|
| 237 | * MUST NOT reply to a multicast/broadcast IP address.
|
|---|
| 238 | * MUST NOT reply to a multicast/broadcast MAC address.
|
|---|
| 239 | * MUST reply to only the first fragment.
|
|---|
| 240 | */
|
|---|
| 241 | /*
|
|---|
| 242 | * Send ICMP_UNREACH back to the source regarding msrc.
|
|---|
| 243 | * mbuf *msrc is used as a template, but is NOT m_free()'d.
|
|---|
| 244 | * It is reported as the bad ip packet. The header should
|
|---|
| 245 | * be fully correct and in host byte order.
|
|---|
| 246 | * ICMP fragmentation is illegal. All machines must accept 576 bytes in one
|
|---|
| 247 | * packet. The maximum payload is 576-20(ip hdr)-8(icmp hdr)=548
|
|---|
| 248 | */
|
|---|
| 249 |
|
|---|
| 250 | #define ICMP_MAXDATALEN (IP_MSS-28)
|
|---|
| 251 | #ifndef VBOX
|
|---|
| 252 | void
|
|---|
| 253 | icmp_error(msrc, type, code, minsize, message)
|
|---|
| 254 | struct mbuf *msrc;
|
|---|
| 255 | u_char type;
|
|---|
| 256 | u_char code;
|
|---|
| 257 | int minsize;
|
|---|
| 258 | char *message;
|
|---|
| 259 | #else /* VBOX */
|
|---|
| 260 | void icmp_error(PNATState pData, struct mbuf *msrc, u_char type, u_char code, int minsize, char *message)
|
|---|
| 261 | #endif /* VBOX */
|
|---|
| 262 | {
|
|---|
| 263 | unsigned hlen, shlen, s_ip_len;
|
|---|
| 264 | register struct ip *ip;
|
|---|
| 265 | register struct icmp *icp;
|
|---|
| 266 | register struct mbuf *m;
|
|---|
| 267 |
|
|---|
| 268 | DEBUG_CALL("icmp_error");
|
|---|
| 269 | DEBUG_ARG("msrc = %lx", (long )msrc);
|
|---|
| 270 | DEBUG_ARG("msrc_len = %d", msrc->m_len);
|
|---|
| 271 |
|
|---|
| 272 | if(type!=ICMP_UNREACH && type!=ICMP_TIMXCEED) goto end_error;
|
|---|
| 273 |
|
|---|
| 274 | /* check msrc */
|
|---|
| 275 | if(!msrc) goto end_error;
|
|---|
| 276 | ip = mtod(msrc, struct ip *);
|
|---|
| 277 | #if DEBUG
|
|---|
| 278 | { char bufa[20], bufb[20];
|
|---|
| 279 | strcpy(bufa, inet_ntoa(ip->ip_src));
|
|---|
| 280 | strcpy(bufb, inet_ntoa(ip->ip_dst));
|
|---|
| 281 | DEBUG_MISC((dfd, " %.16s to %.16s\n", bufa, bufb));
|
|---|
| 282 | }
|
|---|
| 283 | #endif
|
|---|
| 284 | if(ip->ip_off & IP_OFFMASK) goto end_error; /* Only reply to fragment 0 */
|
|---|
| 285 |
|
|---|
| 286 | shlen=ip->ip_hl << 2;
|
|---|
| 287 | s_ip_len=ip->ip_len;
|
|---|
| 288 | if(ip->ip_p == IPPROTO_ICMP) {
|
|---|
| 289 | icp = (struct icmp *)((char *)ip + shlen);
|
|---|
| 290 | /*
|
|---|
| 291 | * Assume any unknown ICMP type is an error. This isn't
|
|---|
| 292 | * specified by the RFC, but think about it..
|
|---|
| 293 | */
|
|---|
| 294 | if(icp->icmp_type>18 || icmp_flush[icp->icmp_type]) goto end_error;
|
|---|
| 295 | }
|
|---|
| 296 |
|
|---|
| 297 | /* make a copy */
|
|---|
| 298 | #ifdef VBOX
|
|---|
| 299 | if(!(m=m_get(pData))) goto end_error; /* get mbuf */
|
|---|
| 300 | #else /* !VBOX */
|
|---|
| 301 | if(!(m=m_get())) goto end_error; /* get mbuf */
|
|---|
| 302 | #endif /* !VBOX */
|
|---|
| 303 | { int new_m_size;
|
|---|
| 304 | new_m_size=sizeof(struct ip )+ICMP_MINLEN+msrc->m_len+ICMP_MAXDATALEN;
|
|---|
| 305 | if(new_m_size>m->m_size) m_inc(m, new_m_size);
|
|---|
| 306 | }
|
|---|
| 307 | memcpy(m->m_data, msrc->m_data, msrc->m_len);
|
|---|
| 308 | m->m_len = msrc->m_len; /* copy msrc to m */
|
|---|
| 309 |
|
|---|
| 310 | /* make the header of the reply packet */
|
|---|
| 311 | ip = mtod(m, struct ip *);
|
|---|
| 312 | hlen= sizeof(struct ip ); /* no options in reply */
|
|---|
| 313 |
|
|---|
| 314 | /* fill in icmp */
|
|---|
| 315 | m->m_data += hlen;
|
|---|
| 316 | m->m_len -= hlen;
|
|---|
| 317 |
|
|---|
| 318 | icp = mtod(m, struct icmp *);
|
|---|
| 319 |
|
|---|
| 320 | if(minsize) s_ip_len=shlen+ICMP_MINLEN; /* return header+8b only */
|
|---|
| 321 | else if(s_ip_len>ICMP_MAXDATALEN) /* maximum size */
|
|---|
| 322 | s_ip_len=ICMP_MAXDATALEN;
|
|---|
| 323 |
|
|---|
| 324 | m->m_len=ICMP_MINLEN+s_ip_len; /* 8 bytes ICMP header */
|
|---|
| 325 |
|
|---|
| 326 | /* min. size = 8+sizeof(struct ip)+8 */
|
|---|
| 327 |
|
|---|
| 328 | icp->icmp_type = type;
|
|---|
| 329 | icp->icmp_code = code;
|
|---|
| 330 | icp->icmp_id = 0;
|
|---|
| 331 | icp->icmp_seq = 0;
|
|---|
| 332 |
|
|---|
| 333 | memcpy(&icp->icmp_ip, msrc->m_data, s_ip_len); /* report the ip packet */
|
|---|
| 334 | HTONS(icp->icmp_ip.ip_len);
|
|---|
| 335 | HTONS(icp->icmp_ip.ip_id);
|
|---|
| 336 | HTONS(icp->icmp_ip.ip_off);
|
|---|
| 337 |
|
|---|
| 338 | #if DEBUG
|
|---|
| 339 | if(message) { /* DEBUG : append message to ICMP packet */
|
|---|
| 340 | int message_len;
|
|---|
| 341 | char *cpnt;
|
|---|
| 342 | message_len=strlen(message);
|
|---|
| 343 | if(message_len>ICMP_MAXDATALEN) message_len=ICMP_MAXDATALEN;
|
|---|
| 344 | cpnt=(char *)m->m_data+m->m_len;
|
|---|
| 345 | memcpy(cpnt, message, message_len);
|
|---|
| 346 | m->m_len+=message_len;
|
|---|
| 347 | }
|
|---|
| 348 | #endif
|
|---|
| 349 |
|
|---|
| 350 | icp->icmp_cksum = 0;
|
|---|
| 351 | icp->icmp_cksum = cksum(m, m->m_len);
|
|---|
| 352 |
|
|---|
| 353 | m->m_data -= hlen;
|
|---|
| 354 | m->m_len += hlen;
|
|---|
| 355 |
|
|---|
| 356 | /* fill in ip */
|
|---|
| 357 | ip->ip_hl = hlen >> 2;
|
|---|
| 358 | ip->ip_len = m->m_len;
|
|---|
| 359 |
|
|---|
| 360 | ip->ip_tos=((ip->ip_tos & 0x1E) | 0xC0); /* high priority for errors */
|
|---|
| 361 |
|
|---|
| 362 | ip->ip_ttl = MAXTTL;
|
|---|
| 363 | ip->ip_p = IPPROTO_ICMP;
|
|---|
| 364 | ip->ip_dst = ip->ip_src; /* ip adresses */
|
|---|
| 365 | ip->ip_src = alias_addr;
|
|---|
| 366 |
|
|---|
| 367 | #ifdef VBOX
|
|---|
| 368 | (void ) ip_output(pData, (struct socket *)NULL, m);
|
|---|
| 369 | #else /* !VBOX */
|
|---|
| 370 | (void ) ip_output((struct socket *)NULL, m);
|
|---|
| 371 | #endif /* !VBOX */
|
|---|
| 372 |
|
|---|
| 373 | icmpstat.icps_reflect++;
|
|---|
| 374 |
|
|---|
| 375 | end_error:
|
|---|
| 376 | return;
|
|---|
| 377 | }
|
|---|
| 378 | #undef ICMP_MAXDATALEN
|
|---|
| 379 |
|
|---|
| 380 | /*
|
|---|
| 381 | * Reflect the ip packet back to the source
|
|---|
| 382 | */
|
|---|
| 383 | void
|
|---|
| 384 | #ifdef VBOX
|
|---|
| 385 | icmp_reflect(PNATState pData, struct mbuf *m)
|
|---|
| 386 | #else /* !VBOX */
|
|---|
| 387 | icmp_reflect(m)
|
|---|
| 388 | struct mbuf *m;
|
|---|
| 389 | #endif /* !VBOX */
|
|---|
| 390 | {
|
|---|
| 391 | register struct ip *ip = mtod(m, struct ip *);
|
|---|
| 392 | int hlen = ip->ip_hl << 2;
|
|---|
| 393 | int optlen = hlen - sizeof(struct ip );
|
|---|
| 394 | register struct icmp *icp;
|
|---|
| 395 |
|
|---|
| 396 | /*
|
|---|
| 397 | * Send an icmp packet back to the ip level,
|
|---|
| 398 | * after supplying a checksum.
|
|---|
| 399 | */
|
|---|
| 400 | m->m_data += hlen;
|
|---|
| 401 | m->m_len -= hlen;
|
|---|
| 402 | icp = mtod(m, struct icmp *);
|
|---|
| 403 |
|
|---|
| 404 | icp->icmp_cksum = 0;
|
|---|
| 405 | icp->icmp_cksum = cksum(m, ip->ip_len - hlen);
|
|---|
| 406 |
|
|---|
| 407 | m->m_data -= hlen;
|
|---|
| 408 | m->m_len += hlen;
|
|---|
| 409 |
|
|---|
| 410 | /* fill in ip */
|
|---|
| 411 | if (optlen > 0) {
|
|---|
| 412 | /*
|
|---|
| 413 | * Strip out original options by copying rest of first
|
|---|
| 414 | * mbuf's data back, and adjust the IP length.
|
|---|
| 415 | */
|
|---|
| 416 | memmove((caddr_t)(ip + 1), (caddr_t)ip + hlen,
|
|---|
| 417 | (unsigned )(m->m_len - hlen));
|
|---|
| 418 | hlen -= optlen;
|
|---|
| 419 | ip->ip_hl = hlen >> 2;
|
|---|
| 420 | ip->ip_len -= optlen;
|
|---|
| 421 | m->m_len -= optlen;
|
|---|
| 422 | }
|
|---|
| 423 |
|
|---|
| 424 | ip->ip_ttl = MAXTTL;
|
|---|
| 425 | { /* swap */
|
|---|
| 426 | struct in_addr icmp_dst;
|
|---|
| 427 | icmp_dst = ip->ip_dst;
|
|---|
| 428 | ip->ip_dst = ip->ip_src;
|
|---|
| 429 | ip->ip_src = icmp_dst;
|
|---|
| 430 | }
|
|---|
| 431 |
|
|---|
| 432 | #ifdef VBOX
|
|---|
| 433 | (void ) ip_output(pData, (struct socket *)NULL, m);
|
|---|
| 434 | #else /* !VBOX */
|
|---|
| 435 | (void ) ip_output((struct socket *)NULL, m);
|
|---|
| 436 | #endif /* !VBOX */
|
|---|
| 437 |
|
|---|
| 438 | icmpstat.icps_reflect++;
|
|---|
| 439 | }
|
|---|
