The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 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. |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 13 | * 3. Neither the name of the University nor the names of its contributors |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 14 | * may be used to endorse or promote products derived from this software |
| 15 | * without specific prior written permission. |
| 16 | * |
| 17 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 27 | * SUCH DAMAGE. |
| 28 | * |
| 29 | * @(#)ip_icmp.c 8.2 (Berkeley) 1/4/94 |
| 30 | * ip_icmp.c,v 1.7 1995/05/30 08:09:42 rgrimes Exp |
| 31 | */ |
| 32 | |
| 33 | #include "slirp.h" |
| 34 | #include "ip_icmp.h" |
David 'Digit' Turner | cc330d4 | 2013-12-14 23:26:42 +0100 | [diff] [blame] | 35 | #include "android/sockets.h" |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 36 | |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 37 | #ifdef LOG_ENABLED |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 38 | struct icmpstat icmpstat; |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 39 | #endif |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 40 | |
| 41 | /* The message sent when emulating PING */ |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 42 | /* Be nice and tell them it's just a pseudo-ping packet */ |
| 43 | static const char icmp_ping_msg[] = "This is a pseudo-PING packet used by Slirp to emulate ICMP ECHO-REQUEST packets.\n"; |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 44 | |
| 45 | /* list of actions for icmp_error() on RX of an icmp message */ |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 46 | static const int icmp_flush[19] = { |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 47 | /* ECHO REPLY (0) */ 0, |
| 48 | 1, |
| 49 | 1, |
| 50 | /* DEST UNREACH (3) */ 1, |
| 51 | /* SOURCE QUENCH (4)*/ 1, |
| 52 | /* REDIRECT (5) */ 1, |
| 53 | 1, |
| 54 | 1, |
| 55 | /* ECHO (8) */ 0, |
| 56 | /* ROUTERADVERT (9) */ 1, |
| 57 | /* ROUTERSOLICIT (10) */ 1, |
| 58 | /* TIME EXCEEDED (11) */ 1, |
| 59 | /* PARAMETER PROBLEM (12) */ 1, |
| 60 | /* TIMESTAMP (13) */ 0, |
| 61 | /* TIMESTAMP REPLY (14) */ 0, |
| 62 | /* INFO (15) */ 0, |
| 63 | /* INFO REPLY (16) */ 0, |
| 64 | /* ADDR MASK (17) */ 0, |
| 65 | /* ADDR MASK REPLY (18) */ 0 |
| 66 | }; |
| 67 | |
| 68 | /* |
| 69 | * Process a received ICMP message. |
| 70 | */ |
| 71 | void |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 72 | icmp_input(struct mbuf *m, int hlen) |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 73 | { |
| 74 | register struct icmp *icp; |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 75 | register struct ip *ip=mtod(m, struct ip *); |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 76 | int icmplen=ip->ip_len; |
| 77 | /* int code; */ |
| 78 | |
| 79 | DEBUG_CALL("icmp_input"); |
| 80 | DEBUG_ARG("m = %lx", (long )m); |
| 81 | DEBUG_ARG("m_len = %d", m->m_len); |
| 82 | |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 83 | STAT(icmpstat.icps_received++); |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 84 | |
| 85 | /* |
| 86 | * Locate icmp structure in mbuf, and check |
| 87 | * that its not corrupted and of at least minimum length. |
| 88 | */ |
| 89 | if (icmplen < ICMP_MINLEN) { /* min 8 bytes payload */ |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 90 | STAT(icmpstat.icps_tooshort++); |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 91 | freeit: |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 92 | m_freem(m); |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 93 | goto end_error; |
| 94 | } |
| 95 | |
| 96 | m->m_len -= hlen; |
| 97 | m->m_data += hlen; |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 98 | icp = mtod(m, struct icmp *); |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 99 | if (cksum(m, icmplen)) { |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 100 | STAT(icmpstat.icps_checksum++); |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 101 | goto freeit; |
| 102 | } |
| 103 | m->m_len += hlen; |
| 104 | m->m_data -= hlen; |
| 105 | |
| 106 | /* icmpstat.icps_inhist[icp->icmp_type]++; */ |
| 107 | /* code = icp->icmp_code; */ |
| 108 | |
| 109 | DEBUG_ARG("icmp_type = %d", icp->icmp_type); |
| 110 | switch (icp->icmp_type) { |
| 111 | case ICMP_ECHO: |
| 112 | icp->icmp_type = ICMP_ECHOREPLY; |
| 113 | ip->ip_len += hlen; /* since ip_input subtracts this */ |
| 114 | if (ip_geth(ip->ip_dst) == alias_addr_ip) { |
| 115 | icmp_reflect(m); |
| 116 | } else { |
| 117 | struct socket *so; |
| 118 | SockAddress addr; |
| 119 | uint32_t addr_ip; |
| 120 | uint16_t addr_port; |
| 121 | |
| 122 | if ((so = socreate()) == NULL) goto freeit; |
| 123 | if(udp_attach(so) == -1) { |
| 124 | DEBUG_MISC((dfd,"icmp_input udp_attach errno = %d-%s\n", |
| 125 | errno,errno_str)); |
| 126 | sofree(so); |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 127 | m_free(m); |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 128 | goto end_error; |
| 129 | } |
| 130 | so->so_m = m; |
| 131 | so->so_faddr_ip = ip_geth(ip->ip_dst); |
| 132 | so->so_faddr_port = 7; |
| 133 | so->so_laddr_ip = ip_geth(ip->ip_src); |
| 134 | so->so_laddr_port = 9; |
| 135 | so->so_iptos = ip->ip_tos; |
| 136 | so->so_type = IPPROTO_ICMP; |
| 137 | so->so_state = SS_ISFCONNECTED; |
| 138 | |
| 139 | /* Send the packet */ |
| 140 | if ((so->so_faddr_ip & 0xffffff00) == special_addr_ip) { |
| 141 | /* It's an alias */ |
| 142 | int low = so->so_faddr_ip & 0xff; |
| 143 | |
| 144 | if (low >= CTL_DNS && low < CTL_DNS + dns_addr_count) |
| 145 | addr_ip = dns_addr[low - CTL_DNS]; |
| 146 | else |
| 147 | addr_ip = loopback_addr_ip; |
| 148 | } else { |
| 149 | addr_ip = so->so_faddr_ip; |
| 150 | } |
| 151 | addr_port = so->so_faddr_port; |
| 152 | |
| 153 | sock_address_init_inet( &addr, addr_ip, addr_port ); |
| 154 | |
| 155 | if(socket_sendto(so->s, icmp_ping_msg, strlen(icmp_ping_msg), &addr) < 0) { |
| 156 | DEBUG_MISC((dfd,"icmp_input udp sendto tx errno = %d-%s\n", |
| 157 | errno,errno_str)); |
| 158 | icmp_error(m, ICMP_UNREACH,ICMP_UNREACH_NET, 0,errno_str); |
| 159 | udp_detach(so); |
| 160 | } |
| 161 | } /* if ip->ip_dst.s_addr == alias_addr.s_addr */ |
| 162 | break; |
| 163 | case ICMP_UNREACH: |
| 164 | /* XXX? report error? close socket? */ |
| 165 | case ICMP_TIMXCEED: |
| 166 | case ICMP_PARAMPROB: |
| 167 | case ICMP_SOURCEQUENCH: |
| 168 | case ICMP_TSTAMP: |
| 169 | case ICMP_MASKREQ: |
| 170 | case ICMP_REDIRECT: |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 171 | STAT(icmpstat.icps_notsupp++); |
| 172 | m_freem(m); |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 173 | break; |
| 174 | |
| 175 | default: |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 176 | STAT(icmpstat.icps_badtype++); |
| 177 | m_freem(m); |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 178 | } /* swith */ |
| 179 | |
| 180 | end_error: |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 181 | /* m is m_free()'d xor put in a socket xor or given to ip_send */ |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 182 | return; |
| 183 | } |
| 184 | |
| 185 | |
| 186 | /* |
| 187 | * Send an ICMP message in response to a situation |
| 188 | * |
| 189 | * RFC 1122: 3.2.2 MUST send at least the IP header and 8 bytes of header. MAY send more (we do). |
| 190 | * MUST NOT change this header information. |
| 191 | * MUST NOT reply to a multicast/broadcast IP address. |
| 192 | * MUST NOT reply to a multicast/broadcast MAC address. |
| 193 | * MUST reply to only the first fragment. |
| 194 | */ |
| 195 | /* |
| 196 | * Send ICMP_UNREACH back to the source regarding msrc. |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 197 | * mbuf *msrc is used as a template, but is NOT m_free()'d. |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 198 | * It is reported as the bad ip packet. The header should |
| 199 | * be fully correct and in host byte order. |
| 200 | * ICMP fragmentation is illegal. All machines must accept 576 bytes in one |
| 201 | * packet. The maximum payload is 576-20(ip hdr)-8(icmp hdr)=548 |
| 202 | */ |
| 203 | |
| 204 | #define ICMP_MAXDATALEN (IP_MSS-28) |
| 205 | void |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 206 | icmp_error(struct mbuf *msrc, u_char type, u_char code, int minsize, |
| 207 | const char *message) |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 208 | { |
| 209 | unsigned hlen, shlen, s_ip_len; |
| 210 | register struct ip *ip; |
| 211 | register struct icmp *icp; |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 212 | register struct mbuf *m; |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 213 | |
| 214 | DEBUG_CALL("icmp_error"); |
| 215 | DEBUG_ARG("msrc = %lx", (long )msrc); |
| 216 | DEBUG_ARG("msrc_len = %d", msrc->m_len); |
| 217 | |
| 218 | if(type!=ICMP_UNREACH && type!=ICMP_TIMXCEED) goto end_error; |
| 219 | |
| 220 | /* check msrc */ |
| 221 | if(!msrc) goto end_error; |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 222 | ip = mtod(msrc, struct ip *); |
| 223 | #ifdef DEBUG |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 224 | { char bufa[20], bufb[20]; |
| 225 | strcpy(bufa, inet_iptostr(ip_geth(ip->ip_src))); |
| 226 | strcpy(bufb, inet_iptostr(ip_geth(ip->ip_dst))); |
| 227 | DEBUG_MISC((dfd, " %.16s to %.16s\n", bufa, bufb)); |
| 228 | } |
| 229 | #endif |
| 230 | if(ip->ip_off & IP_OFFMASK) goto end_error; /* Only reply to fragment 0 */ |
| 231 | |
| 232 | shlen=ip->ip_hl << 2; |
| 233 | s_ip_len=ip->ip_len; |
| 234 | if(ip->ip_p == IPPROTO_ICMP) { |
| 235 | icp = (struct icmp *)((char *)ip + shlen); |
| 236 | /* |
| 237 | * Assume any unknown ICMP type is an error. This isn't |
| 238 | * specified by the RFC, but think about it.. |
| 239 | */ |
| 240 | if(icp->icmp_type>18 || icmp_flush[icp->icmp_type]) goto end_error; |
| 241 | } |
| 242 | |
| 243 | /* make a copy */ |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 244 | if(!(m=m_get())) goto end_error; /* get mbuf */ |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 245 | { int new_m_size; |
| 246 | new_m_size=sizeof(struct ip )+ICMP_MINLEN+msrc->m_len+ICMP_MAXDATALEN; |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 247 | if(new_m_size>m->m_size) m_inc(m, new_m_size); |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 248 | } |
| 249 | memcpy(m->m_data, msrc->m_data, msrc->m_len); |
| 250 | m->m_len = msrc->m_len; /* copy msrc to m */ |
| 251 | |
| 252 | /* make the header of the reply packet */ |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 253 | ip = mtod(m, struct ip *); |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 254 | hlen= sizeof(struct ip ); /* no options in reply */ |
| 255 | |
| 256 | /* fill in icmp */ |
| 257 | m->m_data += hlen; |
| 258 | m->m_len -= hlen; |
| 259 | |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 260 | icp = mtod(m, struct icmp *); |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 261 | |
| 262 | if(minsize) s_ip_len=shlen+ICMP_MINLEN; /* return header+8b only */ |
| 263 | else if(s_ip_len>ICMP_MAXDATALEN) /* maximum size */ |
| 264 | s_ip_len=ICMP_MAXDATALEN; |
| 265 | |
| 266 | m->m_len=ICMP_MINLEN+s_ip_len; /* 8 bytes ICMP header */ |
| 267 | |
| 268 | /* min. size = 8+sizeof(struct ip)+8 */ |
| 269 | |
| 270 | icp->icmp_type = type; |
| 271 | icp->icmp_code = code; |
| 272 | icp->icmp_id = 0; |
| 273 | icp->icmp_seq = 0; |
| 274 | |
| 275 | memcpy(&icp->icmp_ip, msrc->m_data, s_ip_len); /* report the ip packet */ |
| 276 | HTONS(icp->icmp_ip.ip_len); |
| 277 | HTONS(icp->icmp_ip.ip_id); |
| 278 | HTONS(icp->icmp_ip.ip_off); |
| 279 | |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 280 | #ifdef DEBUG |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 281 | if(message) { /* DEBUG : append message to ICMP packet */ |
| 282 | int message_len; |
| 283 | char *cpnt; |
| 284 | message_len=strlen(message); |
| 285 | if(message_len>ICMP_MAXDATALEN) message_len=ICMP_MAXDATALEN; |
| 286 | cpnt=(char *)m->m_data+m->m_len; |
| 287 | memcpy(cpnt, message, message_len); |
| 288 | m->m_len+=message_len; |
| 289 | } |
| 290 | #endif |
| 291 | |
| 292 | icp->icmp_cksum = 0; |
| 293 | icp->icmp_cksum = cksum(m, m->m_len); |
| 294 | |
| 295 | m->m_data -= hlen; |
| 296 | m->m_len += hlen; |
| 297 | |
| 298 | /* fill in ip */ |
| 299 | ip->ip_hl = hlen >> 2; |
| 300 | ip->ip_len = m->m_len; |
| 301 | |
| 302 | ip->ip_tos=((ip->ip_tos & 0x1E) | 0xC0); /* high priority for errors */ |
| 303 | |
| 304 | ip->ip_ttl = MAXTTL; |
| 305 | ip->ip_p = IPPROTO_ICMP; |
| 306 | ip->ip_dst = ip->ip_src; /* ip adresses */ |
| 307 | ip->ip_src = ip_setn(alias_addr_ip); |
| 308 | |
| 309 | (void ) ip_output((struct socket *)NULL, m); |
| 310 | |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 311 | STAT(icmpstat.icps_reflect++); |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 312 | |
| 313 | end_error: |
| 314 | return; |
| 315 | } |
| 316 | #undef ICMP_MAXDATALEN |
| 317 | |
| 318 | /* |
| 319 | * Reflect the ip packet back to the source |
| 320 | */ |
| 321 | void |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 322 | icmp_reflect(struct mbuf *m) |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 323 | { |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 324 | register struct ip *ip = mtod(m, struct ip *); |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 325 | int hlen = ip->ip_hl << 2; |
| 326 | int optlen = hlen - sizeof(struct ip ); |
| 327 | register struct icmp *icp; |
| 328 | |
| 329 | /* |
| 330 | * Send an icmp packet back to the ip level, |
| 331 | * after supplying a checksum. |
| 332 | */ |
| 333 | m->m_data += hlen; |
| 334 | m->m_len -= hlen; |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 335 | icp = mtod(m, struct icmp *); |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 336 | |
| 337 | icp->icmp_cksum = 0; |
| 338 | icp->icmp_cksum = cksum(m, ip->ip_len - hlen); |
| 339 | |
| 340 | m->m_data -= hlen; |
| 341 | m->m_len += hlen; |
| 342 | |
| 343 | /* fill in ip */ |
| 344 | if (optlen > 0) { |
| 345 | /* |
| 346 | * Strip out original options by copying rest of first |
| 347 | * mbuf's data back, and adjust the IP length. |
| 348 | */ |
| 349 | memmove((caddr_t)(ip + 1), (caddr_t)ip + hlen, |
| 350 | (unsigned )(m->m_len - hlen)); |
| 351 | hlen -= optlen; |
| 352 | ip->ip_hl = hlen >> 2; |
| 353 | ip->ip_len -= optlen; |
| 354 | m->m_len -= optlen; |
| 355 | } |
| 356 | |
| 357 | ip->ip_ttl = MAXTTL; |
| 358 | { /* swap */ |
| 359 | ipaddr_t icmp_dst; |
| 360 | icmp_dst = ip->ip_dst; |
| 361 | ip->ip_dst = ip->ip_src; |
| 362 | ip->ip_src = icmp_dst; |
| 363 | } |
| 364 | |
| 365 | (void ) ip_output((struct socket *)NULL, m); |
| 366 | |
David 'Digit' Turner | 5d8f37a | 2009-09-14 14:32:27 -0700 | [diff] [blame] | 367 | STAT(icmpstat.icps_reflect++); |
The Android Open Source Project | 8b23a6c | 2009-03-03 19:30:32 -0800 | [diff] [blame] | 368 | } |