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/* $OpenBSD: print-ipsec.c,v 1.7 2003/02/20 23:39:20 jason Exp $ */
/*
* Copyright (c) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that: (1) source code distributions
* retain the above copyright notice and this paragraph in its entirety, (2)
* distributions including binary code include the above copyright notice and
* this paragraph in its entirety in the documentation or other materials
* provided with the distribution, and (3) all advertising materials mentioning
* features or use of this software display the following acknowledgement:
* ``This product includes software developed by the University of California,
* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
* the University nor the names of its contributors may be used to endorse
* or promote products derived from this software without specific prior
* written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*
* Format and print IPsec (ESP/AH) packets.
* By Tero Kivinen <kivinen@ssh.fi>, Tero Mononen <tmo@ssh.fi>,
* Tatu Ylonen <ylo@ssh.fi> and Timo J. Rinne <tri@ssh.fi>
* in co-operation with SSH Communications Security, Espoo, Finland
*/
#ifndef lint
static const char rcsid[] =
"@(#) $Header: /cvs/OpenBSD/src/usr.sbin/tcpdump/print-ipsec.c,v 1.7 2003/02/20 23:39:20 jason Exp $ (XXX)";
#endif
#include <sys/param.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/ip_var.h>
#include <netinet/udp.h>
#include <netinet/udp_var.h>
#include <netinet/tcp.h>
#include <netinet/tcpip.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "addrtoname.h"
#include "interface.h"
#include "extract.h" /* must come after interface.h */
/*
* IPsec/ESP header
*/
struct esp_hdr {
u_int esp_spi;
u_int esp_seq;
};
void
esp_print (register const u_char *bp, register u_int len,
register const u_char *bp2)
{
const struct ip *ip;
const struct esp_hdr *esp;
u_int plen = len;
ip = (const struct ip *)bp2;
printf("esp %s > %s",
ipaddr_string(&ip->ip_src), ipaddr_string(&ip->ip_dst));
if (plen < sizeof(struct esp_hdr)) {
printf("[|esp]");
return;
}
esp = (const struct esp_hdr *)bp;
printf(" spi 0x%08X seq %d len %d",
ntohl(esp->esp_spi), ntohl(esp->esp_seq), len);
}
/*
* IPsec/AH header
*/
struct ah_hdr {
u_char ah_nxt_hdr;
u_char ah_pl_len;
u_short ah_reserved;
u_int ah_spi;
u_int ah_seq;
};
void
ah_print (register const u_char *bp, register u_int len,
register const u_char *bp2)
{
const struct ip *ip;
const struct ah_hdr *ah;
u_int pl_len = len;
ip = (const struct ip *)bp2;
printf("ah %s > %s",
ipaddr_string(&ip->ip_src), ipaddr_string(&ip->ip_dst));
if (pl_len < sizeof(struct ah_hdr)) {
printf("[|esp]");
return;
}
ah = (const struct ah_hdr *)bp;
printf(" spi 0x%08X seq %d len %d",
ntohl(ah->ah_spi), ntohl(ah->ah_seq), len);
if (vflag) {
(void)printf("\n\t[ ");
pl_len = (ah->ah_pl_len + 2) << 2; /* RFC2402, sec 2.2 */
if (len - pl_len <= 0) {
(void)printf("truncated");
goto out;
}
switch (ah->ah_nxt_hdr) {
case IPPROTO_IPIP: /* Tunnel Mode, IP-in-IP */
ip_print(bp + pl_len, len - pl_len);
break;
case IPPROTO_ICMP: /* From here and down; Transport mode */
icmp_print(bp + pl_len, (const u_char *) ip);
break;
case IPPROTO_TCP:
tcp_print(bp + pl_len, len - pl_len,
(const u_char *) ip);
break;
case IPPROTO_UDP:
udp_print(bp + pl_len, len - pl_len,
(const u_char *) ip);
break;
case IPPROTO_ESP:
esp_print(bp + pl_len, len - pl_len,
(const u_char *) ip);
break;
case IPPROTO_AH:
ah_print(bp + pl_len, len - pl_len,
(const u_char *) ip);
break;
default:
(void)printf("ip-proto-%d len %d", ah->ah_nxt_hdr,
len - pl_len);
}
out:
(void)printf(" ]");
}
}
struct ipcomp_hdr {
u_char ipcomp_nxt_hdr;
u_char ipcomp_flags;
u_short ipcomp_cpi;
};
void
ipcomp_print (register const u_char *bp, register u_int len,
register const u_char *bp2)
{
const struct ip *ip;
const struct ipcomp_hdr *ipc;
u_int plen = len;
ip = (const struct ip *)bp2;
printf("ipcomp %s > %s",
ipaddr_string(&ip->ip_src), ipaddr_string(&ip->ip_dst));
if (plen < sizeof(struct ipcomp_hdr)) {
printf("[|ipcomp]");
return;
}
ipc = (const struct ipcomp_hdr *)bp;
printf(" cpi 0x%04X flags %x next %x",
ntohs(ipc->ipcomp_cpi), ipc->ipcomp_flags, ipc->ipcomp_nxt_hdr);
}
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