mirror of
https://git.FreeBSD.org/src.git
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abf2519367
Approved by: re (kensmith) Obtained from: tcpdump.org
743 lines
18 KiB
C
743 lines
18 KiB
C
/*
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* Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that: (1) source code distributions
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* retain the above copyright notice and this paragraph in its entirety, (2)
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* distributions including binary code include the above copyright notice and
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* this paragraph in its entirety in the documentation or other materials
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* provided with the distribution, and (3) all advertising materials mentioning
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* features or use of this software display the following acknowledgement:
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* ``This product includes software developed by the University of California,
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* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
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* the University nor the names of its contributors may be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*
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* $FreeBSD$
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*/
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#ifndef lint
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static const char rcsid[] _U_ =
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"@(#) $Header: /tcpdump/master/tcpdump/print-ip.c,v 1.149.2.9 2007/09/14 01:30:02 guy Exp $ (LBL)";
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#endif
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <tcpdump-stdinc.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "addrtoname.h"
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#include "interface.h"
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#include "extract.h" /* must come after interface.h */
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#include "ip.h"
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#include "ipproto.h"
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struct tok ip_option_values[] = {
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{ IPOPT_EOL, "EOL" },
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{ IPOPT_NOP, "NOP" },
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{ IPOPT_TS, "timestamp" },
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{ IPOPT_SECURITY, "security" },
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{ IPOPT_RR, "RR" },
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{ IPOPT_SSRR, "SSRR" },
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{ IPOPT_LSRR, "LSRR" },
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{ IPOPT_RA, "RA" },
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{ IPOPT_RFC1393, "traceroute" },
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{ 0, NULL }
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};
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/*
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* print the recorded route in an IP RR, LSRR or SSRR option.
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*/
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static void
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ip_printroute(register const u_char *cp, u_int length)
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{
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register u_int ptr;
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register u_int len;
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if (length < 3) {
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printf(" [bad length %u]", length);
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return;
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}
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if ((length + 1) & 3)
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printf(" [bad length %u]", length);
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ptr = cp[2] - 1;
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if (ptr < 3 || ((ptr + 1) & 3) || ptr > length + 1)
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printf(" [bad ptr %u]", cp[2]);
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for (len = 3; len < length; len += 4) {
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printf(" %s", ipaddr_string(&cp[len]));
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if (ptr > len)
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printf(",");
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}
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}
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/*
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* If source-routing is present and valid, return the final destination.
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* Otherwise, return IP destination.
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*
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* This is used for UDP and TCP pseudo-header in the checksum
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* calculation.
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*/
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u_int32_t
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ip_finddst(const struct ip *ip)
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{
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int length;
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int len;
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const u_char *cp;
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u_int32_t retval;
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cp = (const u_char *)(ip + 1);
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length = (IP_HL(ip) << 2) - sizeof(struct ip);
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for (; length > 0; cp += len, length -= len) {
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int tt;
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TCHECK(*cp);
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tt = *cp;
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if (tt == IPOPT_EOL)
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break;
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else if (tt == IPOPT_NOP)
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len = 1;
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else {
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TCHECK(cp[1]);
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len = cp[1];
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if (len < 2)
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break;
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}
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TCHECK2(*cp, len);
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switch (tt) {
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case IPOPT_SSRR:
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case IPOPT_LSRR:
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if (len < 7)
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break;
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memcpy(&retval, cp + len - 4, 4);
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return retval;
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}
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}
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trunc:
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memcpy(&retval, &ip->ip_dst.s_addr, sizeof(u_int32_t));
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return retval;
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}
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static void
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ip_printts(register const u_char *cp, u_int length)
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{
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register u_int ptr;
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register u_int len;
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int hoplen;
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const char *type;
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if (length < 4) {
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printf("[bad length %u]", length);
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return;
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}
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printf(" TS{");
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hoplen = ((cp[3]&0xF) != IPOPT_TS_TSONLY) ? 8 : 4;
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if ((length - 4) & (hoplen-1))
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printf("[bad length %u]", length);
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ptr = cp[2] - 1;
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len = 0;
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if (ptr < 4 || ((ptr - 4) & (hoplen-1)) || ptr > length + 1)
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printf("[bad ptr %u]", cp[2]);
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switch (cp[3]&0xF) {
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case IPOPT_TS_TSONLY:
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printf("TSONLY");
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break;
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case IPOPT_TS_TSANDADDR:
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printf("TS+ADDR");
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break;
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/*
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* prespecified should really be 3, but some ones might send 2
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* instead, and the IPOPT_TS_PRESPEC constant can apparently
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* have both values, so we have to hard-code it here.
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*/
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case 2:
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printf("PRESPEC2.0");
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break;
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case 3: /* IPOPT_TS_PRESPEC */
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printf("PRESPEC");
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break;
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default:
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printf("[bad ts type %d]", cp[3]&0xF);
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goto done;
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}
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type = " ";
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for (len = 4; len < length; len += hoplen) {
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if (ptr == len)
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type = " ^ ";
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printf("%s%d@%s", type, EXTRACT_32BITS(&cp[len+hoplen-4]),
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hoplen!=8 ? "" : ipaddr_string(&cp[len]));
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type = " ";
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}
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done:
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printf("%s", ptr == len ? " ^ " : "");
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if (cp[3]>>4)
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printf(" [%d hops not recorded]} ", cp[3]>>4);
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else
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printf("}");
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}
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/*
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* print IP options.
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*/
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static void
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ip_optprint(register const u_char *cp, u_int length)
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{
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register u_int option_len;
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const char *sep = "";
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for (; length > 0; cp += option_len, length -= option_len) {
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u_int option_code;
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printf("%s", sep);
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sep = ",";
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TCHECK(*cp);
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option_code = *cp;
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printf("%s",
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tok2str(ip_option_values,"unknown %u",option_code));
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if (option_code == IPOPT_NOP ||
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option_code == IPOPT_EOL)
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option_len = 1;
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else {
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TCHECK(cp[1]);
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option_len = cp[1];
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if (option_len < 2) {
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printf(" [bad length %u]", option_len);
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return;
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}
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}
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if (option_len > length) {
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printf(" [bad length %u]", option_len);
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return;
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}
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TCHECK2(*cp, option_len);
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switch (option_code) {
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case IPOPT_EOL:
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return;
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case IPOPT_TS:
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ip_printts(cp, option_len);
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break;
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case IPOPT_RR: /* fall through */
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case IPOPT_SSRR:
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case IPOPT_LSRR:
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ip_printroute(cp, option_len);
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break;
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case IPOPT_RA:
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if (option_len < 4) {
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printf(" [bad length %u]", option_len);
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break;
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}
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TCHECK(cp[3]);
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if (EXTRACT_16BITS(&cp[2]) != 0)
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printf(" value %u", EXTRACT_16BITS(&cp[2]));
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break;
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case IPOPT_NOP: /* nothing to print - fall through */
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case IPOPT_SECURITY:
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default:
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break;
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}
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}
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return;
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trunc:
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printf("[|ip]");
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}
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/*
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* compute an IP header checksum.
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* don't modifiy the packet.
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*/
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u_short
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in_cksum(const u_short *addr, register u_int len, int csum)
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{
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int nleft = len;
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const u_short *w = addr;
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u_short answer;
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int sum = csum;
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/*
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* Our algorithm is simple, using a 32 bit accumulator (sum),
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* we add sequential 16 bit words to it, and at the end, fold
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* back all the carry bits from the top 16 bits into the lower
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* 16 bits.
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*/
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while (nleft > 1) {
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sum += *w++;
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nleft -= 2;
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}
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if (nleft == 1)
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sum += htons(*(u_char *)w<<8);
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/*
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* add back carry outs from top 16 bits to low 16 bits
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*/
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sum = (sum >> 16) + (sum & 0xffff); /* add hi 16 to low 16 */
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sum += (sum >> 16); /* add carry */
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answer = ~sum; /* truncate to 16 bits */
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return (answer);
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}
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/*
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* Given the host-byte-order value of the checksum field in a packet
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* header, and the network-byte-order computed checksum of the data
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* that the checksum covers (including the checksum itself), compute
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* what the checksum field *should* have been.
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*/
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u_int16_t
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in_cksum_shouldbe(u_int16_t sum, u_int16_t computed_sum)
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{
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u_int32_t shouldbe;
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/*
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* The value that should have gone into the checksum field
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* is the negative of the value gotten by summing up everything
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* *but* the checksum field.
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*
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* We can compute that by subtracting the value of the checksum
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* field from the sum of all the data in the packet, and then
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* computing the negative of that value.
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*
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* "sum" is the value of the checksum field, and "computed_sum"
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* is the negative of the sum of all the data in the packets,
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* so that's -(-computed_sum - sum), or (sum + computed_sum).
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*
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* All the arithmetic in question is one's complement, so the
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* addition must include an end-around carry; we do this by
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* doing the arithmetic in 32 bits (with no sign-extension),
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* and then adding the upper 16 bits of the sum, which contain
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* the carry, to the lower 16 bits of the sum, and then do it
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* again in case *that* sum produced a carry.
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*
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* As RFC 1071 notes, the checksum can be computed without
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* byte-swapping the 16-bit words; summing 16-bit words
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* on a big-endian machine gives a big-endian checksum, which
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* can be directly stuffed into the big-endian checksum fields
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* in protocol headers, and summing words on a little-endian
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* machine gives a little-endian checksum, which must be
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* byte-swapped before being stuffed into a big-endian checksum
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* field.
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*
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* "computed_sum" is a network-byte-order value, so we must put
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* it in host byte order before subtracting it from the
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* host-byte-order value from the header; the adjusted checksum
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* will be in host byte order, which is what we'll return.
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*/
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shouldbe = sum;
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shouldbe += ntohs(computed_sum);
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shouldbe = (shouldbe & 0xFFFF) + (shouldbe >> 16);
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shouldbe = (shouldbe & 0xFFFF) + (shouldbe >> 16);
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return shouldbe;
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}
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#define IP_RES 0x8000
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static struct tok ip_frag_values[] = {
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{ IP_MF, "+" },
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{ IP_DF, "DF" },
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{ IP_RES, "rsvd" }, /* The RFC3514 evil ;-) bit */
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{ 0, NULL }
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};
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struct ip_print_demux_state {
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const struct ip *ip;
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const u_char *cp;
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u_int len, off;
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u_char nh;
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int advance;
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};
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static void
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ip_print_demux(netdissect_options *ndo,
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struct ip_print_demux_state *ipds)
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{
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struct protoent *proto;
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again:
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switch (ipds->nh) {
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case IPPROTO_AH:
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ipds->nh = *ipds->cp;
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ipds->advance = ah_print(ipds->cp);
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if (ipds->advance <= 0)
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break;
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ipds->cp += ipds->advance;
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ipds->len -= ipds->advance;
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goto again;
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case IPPROTO_ESP:
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{
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int enh, padlen;
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ipds->advance = esp_print(ndo, ipds->cp, ipds->len,
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(const u_char *)ipds->ip,
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&enh, &padlen);
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if (ipds->advance <= 0)
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break;
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ipds->cp += ipds->advance;
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ipds->len -= ipds->advance + padlen;
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ipds->nh = enh & 0xff;
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goto again;
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}
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case IPPROTO_IPCOMP:
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{
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int enh;
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ipds->advance = ipcomp_print(ipds->cp, &enh);
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if (ipds->advance <= 0)
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break;
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ipds->cp += ipds->advance;
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ipds->len -= ipds->advance;
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ipds->nh = enh & 0xff;
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goto again;
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}
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|
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case IPPROTO_SCTP:
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sctp_print(ipds->cp, (const u_char *)ipds->ip, ipds->len);
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break;
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case IPPROTO_DCCP:
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dccp_print(ipds->cp, (const u_char *)ipds->ip, ipds->len);
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break;
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case IPPROTO_TCP:
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/* pass on the MF bit plus the offset to detect fragments */
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tcp_print(ipds->cp, ipds->len, (const u_char *)ipds->ip,
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ipds->off & (IP_MF|IP_OFFMASK));
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break;
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case IPPROTO_UDP:
|
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/* pass on the MF bit plus the offset to detect fragments */
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udp_print(ipds->cp, ipds->len, (const u_char *)ipds->ip,
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ipds->off & (IP_MF|IP_OFFMASK));
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break;
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|
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case IPPROTO_ICMP:
|
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/* pass on the MF bit plus the offset to detect fragments */
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icmp_print(ipds->cp, ipds->len, (const u_char *)ipds->ip,
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ipds->off & (IP_MF|IP_OFFMASK));
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break;
|
|
|
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case IPPROTO_PIGP:
|
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/*
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* XXX - the current IANA protocol number assignments
|
|
* page lists 9 as "any private interior gateway
|
|
* (used by Cisco for their IGRP)" and 88 as
|
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* "EIGRP" from Cisco.
|
|
*
|
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* Recent BSD <netinet/in.h> headers define
|
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* IP_PROTO_PIGP as 9 and IP_PROTO_IGRP as 88.
|
|
* We define IP_PROTO_PIGP as 9 and
|
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* IP_PROTO_EIGRP as 88; those names better
|
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* match was the current protocol number
|
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* assignments say.
|
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*/
|
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igrp_print(ipds->cp, ipds->len, (const u_char *)ipds->ip);
|
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break;
|
|
|
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case IPPROTO_EIGRP:
|
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eigrp_print(ipds->cp, ipds->len);
|
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break;
|
|
|
|
case IPPROTO_ND:
|
|
ND_PRINT((ndo, " nd %d", ipds->len));
|
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break;
|
|
|
|
case IPPROTO_EGP:
|
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egp_print(ipds->cp, ipds->len);
|
|
break;
|
|
|
|
case IPPROTO_OSPF:
|
|
ospf_print(ipds->cp, ipds->len, (const u_char *)ipds->ip);
|
|
break;
|
|
|
|
case IPPROTO_IGMP:
|
|
igmp_print(ipds->cp, ipds->len);
|
|
break;
|
|
|
|
case IPPROTO_IPV4:
|
|
/* DVMRP multicast tunnel (ip-in-ip encapsulation) */
|
|
ip_print(gndo, ipds->cp, ipds->len);
|
|
if (! vflag) {
|
|
ND_PRINT((ndo, " (ipip-proto-4)"));
|
|
return;
|
|
}
|
|
break;
|
|
|
|
#ifdef INET6
|
|
case IPPROTO_IPV6:
|
|
/* ip6-in-ip encapsulation */
|
|
ip6_print(ipds->cp, ipds->len);
|
|
break;
|
|
#endif /*INET6*/
|
|
|
|
case IPPROTO_RSVP:
|
|
rsvp_print(ipds->cp, ipds->len);
|
|
break;
|
|
|
|
case IPPROTO_GRE:
|
|
/* do it */
|
|
gre_print(ipds->cp, ipds->len);
|
|
break;
|
|
|
|
case IPPROTO_MOBILE:
|
|
mobile_print(ipds->cp, ipds->len);
|
|
break;
|
|
|
|
case IPPROTO_PIM:
|
|
pim_print(ipds->cp, ipds->len);
|
|
break;
|
|
|
|
case IPPROTO_VRRP:
|
|
vrrp_print(ipds->cp, ipds->len, ipds->ip->ip_ttl);
|
|
break;
|
|
|
|
case IPPROTO_PGM:
|
|
pgm_print(ipds->cp, ipds->len, (const u_char *)ipds->ip);
|
|
break;
|
|
|
|
default:
|
|
if ((proto = getprotobynumber(ipds->nh)) != NULL)
|
|
ND_PRINT((ndo, " %s", proto->p_name));
|
|
else
|
|
ND_PRINT((ndo, " ip-proto-%d", ipds->nh));
|
|
ND_PRINT((ndo, " %d", ipds->len));
|
|
break;
|
|
}
|
|
}
|
|
|
|
void
|
|
ip_print_inner(netdissect_options *ndo,
|
|
const u_char *bp,
|
|
u_int length, u_int nh,
|
|
const u_char *bp2)
|
|
{
|
|
struct ip_print_demux_state ipd;
|
|
|
|
ipd.ip = (const struct ip *)bp2;
|
|
ipd.cp = bp;
|
|
ipd.len = length;
|
|
ipd.off = 0;
|
|
ipd.nh = nh;
|
|
ipd.advance = 0;
|
|
|
|
ip_print_demux(ndo, &ipd);
|
|
}
|
|
|
|
|
|
/*
|
|
* print an IP datagram.
|
|
*/
|
|
void
|
|
ip_print(netdissect_options *ndo,
|
|
const u_char *bp,
|
|
u_int length)
|
|
{
|
|
struct ip_print_demux_state ipd;
|
|
struct ip_print_demux_state *ipds=&ipd;
|
|
const u_char *ipend;
|
|
u_int hlen;
|
|
u_int16_t sum, ip_sum;
|
|
struct protoent *proto;
|
|
|
|
ipds->ip = (const struct ip *)bp;
|
|
if (IP_V(ipds->ip) != 4) { /* print version if != 4 */
|
|
printf("IP%u ", IP_V(ipds->ip));
|
|
if (IP_V(ipds->ip) == 6)
|
|
printf(", wrong link-layer encapsulation");
|
|
}
|
|
else if (!eflag)
|
|
printf("IP ");
|
|
|
|
if ((u_char *)(ipds->ip + 1) > snapend) {
|
|
printf("[|ip]");
|
|
return;
|
|
}
|
|
if (length < sizeof (struct ip)) {
|
|
(void)printf("truncated-ip %u", length);
|
|
return;
|
|
}
|
|
hlen = IP_HL(ipds->ip) * 4;
|
|
if (hlen < sizeof (struct ip)) {
|
|
(void)printf("bad-hlen %u", hlen);
|
|
return;
|
|
}
|
|
|
|
ipds->len = EXTRACT_16BITS(&ipds->ip->ip_len);
|
|
if (length < ipds->len)
|
|
(void)printf("truncated-ip - %u bytes missing! ",
|
|
ipds->len - length);
|
|
if (ipds->len < hlen) {
|
|
#ifdef GUESS_TSO
|
|
if (ipds->len) {
|
|
(void)printf("bad-len %u", ipds->len);
|
|
return;
|
|
}
|
|
else {
|
|
/* we guess that it is a TSO send */
|
|
ipds->len = length;
|
|
}
|
|
#else
|
|
(void)printf("bad-len %u", ipds->len);
|
|
return;
|
|
#endif /* GUESS_TSO */
|
|
}
|
|
|
|
/*
|
|
* Cut off the snapshot length to the end of the IP payload.
|
|
*/
|
|
ipend = bp + ipds->len;
|
|
if (ipend < snapend)
|
|
snapend = ipend;
|
|
|
|
ipds->len -= hlen;
|
|
|
|
ipds->off = EXTRACT_16BITS(&ipds->ip->ip_off);
|
|
|
|
if (vflag) {
|
|
(void)printf("(tos 0x%x", (int)ipds->ip->ip_tos);
|
|
/* ECN bits */
|
|
if (ipds->ip->ip_tos & 0x03) {
|
|
switch (ipds->ip->ip_tos & 0x03) {
|
|
case 1:
|
|
(void)printf(",ECT(1)");
|
|
break;
|
|
case 2:
|
|
(void)printf(",ECT(0)");
|
|
break;
|
|
case 3:
|
|
(void)printf(",CE");
|
|
}
|
|
}
|
|
|
|
if (ipds->ip->ip_ttl >= 1)
|
|
(void)printf(", ttl %u", ipds->ip->ip_ttl);
|
|
|
|
/*
|
|
* for the firewall guys, print id, offset.
|
|
* On all but the last stick a "+" in the flags portion.
|
|
* For unfragmented datagrams, note the don't fragment flag.
|
|
*/
|
|
|
|
(void)printf(", id %u, offset %u, flags [%s], proto %s (%u)",
|
|
EXTRACT_16BITS(&ipds->ip->ip_id),
|
|
(ipds->off & 0x1fff) * 8,
|
|
bittok2str(ip_frag_values, "none", ipds->off&0xe000),
|
|
tok2str(ipproto_values,"unknown",ipds->ip->ip_p),
|
|
ipds->ip->ip_p);
|
|
|
|
(void)printf(", length %u", EXTRACT_16BITS(&ipds->ip->ip_len));
|
|
|
|
if ((hlen - sizeof(struct ip)) > 0) {
|
|
printf(", options (");
|
|
ip_optprint((u_char *)(ipds->ip + 1), hlen - sizeof(struct ip));
|
|
printf(")");
|
|
}
|
|
|
|
if ((u_char *)ipds->ip + hlen <= snapend) {
|
|
sum = in_cksum((const u_short *)ipds->ip, hlen, 0);
|
|
if (sum != 0) {
|
|
ip_sum = EXTRACT_16BITS(&ipds->ip->ip_sum);
|
|
(void)printf(", bad cksum %x (->%x)!", ip_sum,
|
|
in_cksum_shouldbe(ip_sum, sum));
|
|
}
|
|
}
|
|
|
|
printf(") ");
|
|
}
|
|
|
|
/*
|
|
* If this is fragment zero, hand it to the next higher
|
|
* level protocol.
|
|
*/
|
|
if ((ipds->off & 0x1fff) == 0) {
|
|
ipds->cp = (const u_char *)ipds->ip + hlen;
|
|
ipds->nh = ipds->ip->ip_p;
|
|
|
|
if (ipds->nh != IPPROTO_TCP && ipds->nh != IPPROTO_UDP &&
|
|
ipds->nh != IPPROTO_SCTP && ipds->nh != IPPROTO_DCCP) {
|
|
(void)printf("%s > %s: ",
|
|
ipaddr_string(&ipds->ip->ip_src),
|
|
ipaddr_string(&ipds->ip->ip_dst));
|
|
}
|
|
ip_print_demux(ndo, ipds);
|
|
} else {
|
|
/* Ultra quiet now means that all this stuff should be suppressed */
|
|
if (qflag > 1) return;
|
|
|
|
/*
|
|
* if this isn't the first frag, we're missing the
|
|
* next level protocol header. print the ip addr
|
|
* and the protocol.
|
|
*/
|
|
if (ipds->off & 0x1fff) {
|
|
(void)printf("%s > %s:", ipaddr_string(&ipds->ip->ip_src),
|
|
ipaddr_string(&ipds->ip->ip_dst));
|
|
if ((proto = getprotobynumber(ipds->ip->ip_p)) != NULL)
|
|
(void)printf(" %s", proto->p_name);
|
|
else
|
|
(void)printf(" ip-proto-%d", ipds->ip->ip_p);
|
|
}
|
|
}
|
|
}
|
|
|
|
void
|
|
ipN_print(register const u_char *bp, register u_int length)
|
|
{
|
|
struct ip *ip, hdr;
|
|
|
|
ip = (struct ip *)bp;
|
|
if (length < 4) {
|
|
(void)printf("truncated-ip %d", length);
|
|
return;
|
|
}
|
|
memcpy (&hdr, (char *)ip, 4);
|
|
switch (IP_V(&hdr)) {
|
|
case 4:
|
|
ip_print (gndo, bp, length);
|
|
return;
|
|
#ifdef INET6
|
|
case 6:
|
|
ip6_print (bp, length);
|
|
return;
|
|
#endif
|
|
default:
|
|
(void)printf("unknown ip %d", IP_V(&hdr));
|
|
return;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Local Variables:
|
|
* c-style: whitesmith
|
|
* c-basic-offset: 8
|
|
* End:
|
|
*/
|
|
|
|
|