264 lines
6.8 KiB
C
264 lines
6.8 KiB
C
/*
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* Copyright (c) 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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* Code by Matt Thomas, Digital Equipment Corporation
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* with an awful lot of hacking by Jeffrey Mogul, DECWRL
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*/
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#ifndef lint
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static const char rcsid[] =
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"@(#) $Header: /tcpdump/master/tcpdump/print-llc.c,v 1.32 2000/12/18 07:55:36 guy Exp $";
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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 <sys/param.h>
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#include <sys/time.h>
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#include <netinet/in.h>
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#include <ctype.h>
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#include <netdb.h>
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#include <stdio.h>
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#include <string.h>
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#include "interface.h"
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#include "addrtoname.h"
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#include "extract.h" /* must come after interface.h */
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#include "llc.h"
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static struct tok cmd2str[] = {
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{ LLC_UI, "ui" },
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{ LLC_TEST, "test" },
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{ LLC_XID, "xid" },
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{ LLC_UA, "ua" },
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{ LLC_DISC, "disc" },
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{ LLC_DM, "dm" },
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{ LLC_SABME, "sabme" },
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{ LLC_FRMR, "frmr" },
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{ 0, NULL }
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};
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/*
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* Returns non-zero IFF it succeeds in printing the header
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*/
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int
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llc_print(const u_char *p, u_int length, u_int caplen,
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const u_char *esrc, const u_char *edst, u_short *extracted_ethertype)
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{
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struct llc llc;
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register u_short et;
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u_int16_t control;
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register int ret;
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if (caplen < 3) {
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(void)printf("[|llc]");
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default_print((u_char *)p, caplen);
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return(0);
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}
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/* Watch out for possible alignment problems */
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memcpy((char *)&llc, (char *)p, min(caplen, sizeof(llc)));
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if (llc.ssap == LLCSAP_GLOBAL && llc.dsap == LLCSAP_GLOBAL) {
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ipx_print(p, length);
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return (1);
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}
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/* Cisco Discovery Protocol - SNAP & ether type 0x2000 */
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if(llc.ssap == LLCSAP_SNAP && llc.dsap == LLCSAP_SNAP &&
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llc.llcui == LLC_UI &&
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llc.ethertype[0] == 0x20 && llc.ethertype[1] == 0x00 ) {
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cdp_print( p, length, caplen, esrc, edst);
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return (1);
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}
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if (llc.ssap == LLCSAP_8021D && llc.dsap == LLCSAP_8021D) {
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stp_print(p, length);
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return (1);
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}
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if (llc.ssap == 0xf0 && llc.dsap == 0xf0
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&& (!(llc.llcu & LLC_S_FMT) || llc.llcu == LLC_U_FMT)) {
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/*
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* we don't actually have a full netbeui parser yet, but the
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* smb parser can handle many smb-in-netbeui packets, which
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* is very useful, so we call that
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*
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* We don't call it for S frames, however, just I frames
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* (which are frames that don't have the low-order bit,
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* LLC_S_FMT, set in the first byte of the control field)
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* and UI frames (whose control field is just 3, LLC_U_FMT).
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*/
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/*
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* Skip the DSAP and LSAP.
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*/
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p += 2;
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length -= 2;
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caplen -= 2;
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/*
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* OK, what type of LLC frame is this? The length
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* of the control field depends on that - I frames
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* have a two-byte control field, and U frames have
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* a one-byte control field.
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*/
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if (llc.llcu == LLC_U_FMT) {
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control = llc.llcu;
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p += 1;
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length -= 1;
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caplen -= 1;
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} else {
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/*
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* The control field in I and S frames is
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* little-endian.
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*/
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control = EXTRACT_LE_16BITS(&llc.llcu);
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p += 2;
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length -= 2;
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caplen -= 2;
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}
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netbeui_print(control, p, p + min(caplen, length));
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return (1);
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}
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if (llc.ssap == LLCSAP_ISONS && llc.dsap == LLCSAP_ISONS
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&& llc.llcui == LLC_UI) {
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isoclns_print(p + 3, length - 3, caplen - 3, esrc, edst);
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return (1);
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}
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if (llc.ssap == LLCSAP_SNAP && llc.dsap == LLCSAP_SNAP
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&& llc.llcui == LLC_UI) {
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if (caplen < sizeof(llc)) {
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(void)printf("[|llc-snap]");
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default_print((u_char *)p, caplen);
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return (0);
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}
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if (vflag)
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(void)printf("snap %s ", protoid_string(llc.llcpi));
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caplen -= sizeof(llc);
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length -= sizeof(llc);
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p += sizeof(llc);
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/* This is an encapsulated Ethernet packet */
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et = EXTRACT_16BITS(&llc.ethertype[0]);
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ret = ether_encap_print(et, p, length, caplen,
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extracted_ethertype);
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if (ret)
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return (ret);
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}
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if ((llc.ssap & ~LLC_GSAP) == llc.dsap) {
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if (eflag)
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(void)printf("%s ", llcsap_string(llc.dsap));
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else
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(void)printf("%s > %s %s ",
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etheraddr_string(esrc),
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etheraddr_string(edst),
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llcsap_string(llc.dsap));
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} else {
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if (eflag)
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(void)printf("%s > %s ",
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llcsap_string(llc.ssap & ~LLC_GSAP),
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llcsap_string(llc.dsap));
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else
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(void)printf("%s %s > %s %s ",
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etheraddr_string(esrc),
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llcsap_string(llc.ssap & ~LLC_GSAP),
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etheraddr_string(edst),
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llcsap_string(llc.dsap));
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}
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if ((llc.llcu & LLC_U_FMT) == LLC_U_FMT) {
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u_int16_t cmd;
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const char *m;
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char f;
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cmd = LLC_U_CMD(llc.llcu);
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m = tok2str(cmd2str, "%02x", cmd);
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switch ((llc.ssap & LLC_GSAP) | (llc.llcu & LLC_U_POLL)) {
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case 0: f = 'C'; break;
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case LLC_GSAP: f = 'R'; break;
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case LLC_U_POLL: f = 'P'; break;
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case LLC_GSAP|LLC_U_POLL: f = 'F'; break;
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default: f = '?'; break;
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}
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printf("%s/%c", m, f);
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p += 3;
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length -= 3;
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caplen -= 3;
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if ((llc.llcu & ~LLC_U_POLL) == LLC_XID) {
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if (*p == LLC_XID_FI) {
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printf(": %02x %02x", p[1], p[2]);
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p += 3;
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length -= 3;
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caplen -= 3;
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}
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}
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if (cmd == LLC_UI && f == 'C') {
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/*
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* we don't have a proper ipx decoder yet, but there
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* is a partial one in the smb code
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*/
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ipx_netbios_print(p,p+min(caplen,length));
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}
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} else {
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char f;
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/*
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* The control field in I and S frames is little-endian.
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*/
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control = EXTRACT_LE_16BITS(&llc.llcu);
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switch ((llc.ssap & LLC_GSAP) | (control & LLC_IS_POLL)) {
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case 0: f = 'C'; break;
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case LLC_GSAP: f = 'R'; break;
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case LLC_IS_POLL: f = 'P'; break;
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case LLC_GSAP|LLC_IS_POLL: f = 'F'; break;
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default: f = '?'; break;
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}
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if ((control & LLC_S_FMT) == LLC_S_FMT) {
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static char *llc_s[] = { "rr", "rej", "rnr", "03" };
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(void)printf("%s (r=%d,%c)",
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llc_s[LLC_S_CMD(control)],
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LLC_IS_NR(control),
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f);
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} else {
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(void)printf("I (s=%d,r=%d,%c)",
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LLC_I_NS(control),
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LLC_IS_NR(control),
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f);
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}
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p += 4;
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length -= 4;
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caplen -= 4;
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}
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(void)printf(" len=%d", length);
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return(1);
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}
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