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/*
* Copyright (c) 1988, 1989, 1990, 1991, 1993, 1994
* 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.
*/
/* \summary: IP Payload Compression Protocol (IPComp) printer */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <netdissect-stdinc.h>
struct ipcomp {
uint8_t comp_nxt; /* Next Header */
uint8_t comp_flags; /* Length of data, in 32bit */
uint16_t comp_cpi; /* Compression parameter index */
};
#include "netdissect.h"
#include "extract.h"
void
ipcomp_print(netdissect_options *ndo, const u_char *bp)
{
const struct ipcomp *ipcomp;
uint16_t cpi;
ipcomp = (const struct ipcomp *)bp;
ND_TCHECK(*ipcomp);
cpi = EXTRACT_BE_U_2(&ipcomp->comp_cpi);
ND_PRINT((ndo, "IPComp(cpi=0x%04x)", cpi));
/*
* XXX - based on the CPI, we could decompress the packet here.
* Packet buffer management is a headache (if we decompress,
* packet will become larger).
*
* We would decompress the packet and then call a routine that,
* based on ipcomp->comp_nxt, dissects the decompressed data.
*
* Until we do that, however, we just return -1, so that
* the loop that processes "protocol"/"next header" types
* stops - there's nothing more it can do with a compressed
* payload.
*/
return;
trunc:
ND_PRINT((ndo, "[|IPCOMP]"));
return;
}
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