NetBSD/dist/tcpdump/print-atm.c

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/* $NetBSD: print-atm.c,v 1.4 2002/05/31 09:45:45 itojun Exp $ */
/*
* Copyright (c) 1994, 1995, 1996, 1997
* 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.
*/
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#include <sys/cdefs.h>
#ifndef lint
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#if 0
static const char rcsid[] =
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"@(#) Header: /tcpdump/master/tcpdump/print-atm.c,v 1.23 2002/04/07 10:05:40 guy Exp (LBL)";
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#else
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__RCSID("$NetBSD: print-atm.c,v 1.4 2002/05/31 09:45:45 itojun Exp $");
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#endif
#endif
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <sys/param.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <stdio.h>
#include <pcap.h>
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#include <string.h>
#include "interface.h"
#include "addrtoname.h"
#include "ethertype.h"
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#include "ether.h"
/*
* Print an RFC 1483 LLC-encapsulated ATM frame.
*/
static void
atm_llc_print(const u_char *p, int length, int caplen)
{
struct ether_header ehdr;
u_short ether_type;
u_short extracted_ethertype;
ether_type = p[6] << 8 | p[7];
/*
* Fake up an Ethernet header for the benefit of printers that
* insist on "packetp" pointing to an Ethernet header.
*/
memset(&ehdr, '\0', sizeof ehdr);
/*
* Some printers want to get back at the ethernet addresses,
* and/or check that they're not walking off the end of the packet.
* Rather than pass them all the way down, we set these globals.
*/
snapend = p + caplen;
/*
* Actually, the only printers that use packetp are print-arp.c
* and print-bootp.c, and they assume that packetp points to an
* Ethernet header. The right thing to do is to fix them to know
* which link type is in use when they excavate. XXX
*/
packetp = (u_char *)&ehdr;
if (!llc_print(p, length, caplen, ESRC(&ehdr), EDST(&ehdr),
&extracted_ethertype)) {
/* ether_type not known, print raw packet */
if (extracted_ethertype) {
printf("(LLC %s) ",
etherproto_string(htons(extracted_ethertype)));
}
if (!xflag && !qflag)
default_print(p, caplen);
}
}
/*
* This is the top level routine of the printer. 'p' is the points
* to the LLC/SNAP header of the packet, 'tvp' is the timestamp,
* 'length' is the length of the packet off the wire, and 'caplen'
* is the number of bytes actually captured.
*/
void
atm_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p)
{
u_int caplen = h->caplen;
u_int length = h->len;
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++infodelay;
ts_print(&h->ts);
if (caplen < 8) {
printf("[|atm]");
goto out;
}
if (p[0] != 0xaa || p[1] != 0xaa || p[2] != 0x03) {
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/*
* XXX - assume 802.6 MAC header from Fore driver.
* XXX - should we also assume it's not a MAC header
* if it begins with 0xfe 0xfe 0x03, for RFC 2684
* routed NLPID-formatted PDUs?
*/
if (eflag)
printf("%04x%04x %04x%04x ",
p[0] << 24 | p[1] << 16 | p[2] << 8 | p[3],
p[4] << 24 | p[5] << 16 | p[6] << 8 | p[7],
p[8] << 24 | p[9] << 16 | p[10] << 8 | p[11],
p[12] << 24 | p[13] << 16 | p[14] << 8 | p[15]);
p += 20;
length -= 20;
caplen -= 20;
}
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atm_llc_print(p, length, caplen);
if (xflag)
default_print(p, caplen);
out:
putchar('\n');
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--infodelay;
if (infoprint)
info(0);
}