536 lines
13 KiB
C
536 lines
13 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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* $FreeBSD$
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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-llc.c,v 1.61.2.10 2007/02/08 07:07:51 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 <tcpdump-stdinc.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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#include "ethertype.h"
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#include "oui.h"
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static struct tok llc_values[] = {
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{ LLCSAP_NULL, "Null" },
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{ LLCSAP_GLOBAL, "Global" },
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{ LLCSAP_8021B_I, "802.1B I" },
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{ LLCSAP_8021B_G, "802.1B G" },
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{ LLCSAP_IP, "IP" },
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{ LLCSAP_SNA, "SNA" },
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{ LLCSAP_PROWAYNM, "ProWay NM" },
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{ LLCSAP_8021D, "STP" },
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{ LLCSAP_RS511, "RS511" },
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{ LLCSAP_ISO8208, "ISO8208" },
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{ LLCSAP_PROWAY, "ProWay" },
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{ LLCSAP_SNAP, "SNAP" },
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{ LLCSAP_IPX, "IPX" },
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{ LLCSAP_NETBEUI, "NetBeui" },
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{ LLCSAP_ISONS, "OSI" },
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{ 0, NULL },
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};
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static struct tok llc_cmd_values[] = {
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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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static const struct tok llc_flag_values[] = {
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{ 0, "Command" },
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{ LLC_GSAP, "Response" },
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{ LLC_U_POLL, "Poll" },
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{ LLC_GSAP|LLC_U_POLL, "Final" },
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{ LLC_IS_POLL, "Poll" },
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{ LLC_GSAP|LLC_IS_POLL, "Final" },
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{ 0, NULL }
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};
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static const struct tok llc_ig_flag_values[] = {
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{ 0, "Individual" },
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{ LLC_IG, "Group" },
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{ 0, NULL }
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};
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static const struct tok llc_supervisory_values[] = {
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{ 0, "Receiver Ready" },
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{ 1, "Receiver not Ready" },
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{ 2, "Reject" },
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{ 0, NULL }
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};
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static const struct tok cisco_values[] = {
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{ PID_CISCO_CDP, "CDP" },
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{ PID_CISCO_VTP, "VTP" },
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{ PID_CISCO_DTP, "DTP" },
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{ 0, NULL }
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};
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static const struct tok bridged_values[] = {
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{ PID_RFC2684_ETH_FCS, "Ethernet + FCS" },
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{ PID_RFC2684_ETH_NOFCS, "Ethernet w/o FCS" },
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{ PID_RFC2684_802_4_FCS, "802.4 + FCS" },
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{ PID_RFC2684_802_4_NOFCS, "802.4 w/o FCS" },
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{ PID_RFC2684_802_5_FCS, "Token Ring + FCS" },
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{ PID_RFC2684_802_5_NOFCS, "Token Ring w/o FCS" },
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{ PID_RFC2684_FDDI_FCS, "FDDI + FCS" },
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{ PID_RFC2684_FDDI_NOFCS, "FDDI w/o FCS" },
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{ PID_RFC2684_802_6_FCS, "802.6 + FCS" },
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{ PID_RFC2684_802_6_NOFCS, "802.6 w/o FCS" },
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{ PID_RFC2684_BPDU, "BPDU" },
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{ 0, NULL },
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};
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static const struct tok null_values[] = {
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{ 0, NULL }
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};
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struct oui_tok {
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u_int32_t oui;
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const struct tok *tok;
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};
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static const struct oui_tok oui_to_tok[] = {
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{ OUI_ENCAP_ETHER, ethertype_values },
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{ OUI_CISCO_90, ethertype_values }, /* uses some Ethertype values */
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{ OUI_APPLETALK, ethertype_values }, /* uses some Ethertype values */
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{ OUI_CISCO, cisco_values },
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{ OUI_RFC2684, bridged_values }, /* bridged, RFC 2427 FR or RFC 2864 ATM */
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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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u_int8_t dsap_field, dsap, ssap_field, ssap;
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u_int16_t control;
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int is_u;
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register int ret;
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*extracted_ethertype = 0;
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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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dsap_field = *p;
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ssap_field = *(p + 1);
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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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control = *(p + 2);
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if ((control & LLC_U_FMT) == LLC_U_FMT) {
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/*
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* U frame.
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*/
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is_u = 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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* 2 bytes...
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*/
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if (caplen < 4) {
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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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/*
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* ...and is little-endian.
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*/
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control = EXTRACT_LE_16BITS(p + 2);
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is_u = 0;
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}
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if (ssap_field == LLCSAP_GLOBAL && dsap_field == LLCSAP_GLOBAL) {
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/*
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* This is an Ethernet_802.3 IPX frame; it has an
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* 802.3 header (i.e., an Ethernet header where the
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* type/length field is <= ETHERMTU, i.e. it's a length
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* field, not a type field), but has no 802.2 header -
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* the IPX packet starts right after the Ethernet header,
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* with a signature of two bytes of 0xFF (which is
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* LLCSAP_GLOBAL).
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*
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* (It might also have been an Ethernet_802.3 IPX at
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* one time, but got bridged onto another network,
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* such as an 802.11 network; this has appeared in at
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* least one capture file.)
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*/
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if (eflag)
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printf("IPX 802.3: ");
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ipx_print(p, length);
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return (1);
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}
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dsap = dsap_field & ~LLC_IG;
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ssap = ssap_field & ~LLC_GSAP;
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if (eflag) {
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printf("LLC, dsap %s (0x%02x) %s, ssap %s (0x%02x) %s",
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tok2str(llc_values, "Unknown", dsap),
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dsap,
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tok2str(llc_ig_flag_values, "Unknown", dsap_field & LLC_IG),
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tok2str(llc_values, "Unknown", ssap),
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ssap,
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tok2str(llc_flag_values, "Unknown", ssap_field & LLC_GSAP));
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if (is_u) {
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printf(", ctrl 0x%02x: ", control);
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} else {
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printf(", ctrl 0x%04x: ", control);
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}
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}
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if (ssap == LLCSAP_8021D && dsap == LLCSAP_8021D &&
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control == LLC_UI) {
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stp_print(p+3, length-3);
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return (1);
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}
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if (ssap == LLCSAP_IP && dsap == LLCSAP_IP &&
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control == LLC_UI) {
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ip_print(gndo, p+4, length-4);
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return (1);
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}
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if (ssap == LLCSAP_IPX && dsap == LLCSAP_IPX &&
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control == LLC_UI) {
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/*
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* This is an Ethernet_802.2 IPX frame, with an 802.3
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* header and an 802.2 LLC header with the source and
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* destination SAPs being the IPX SAP.
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*
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* Skip DSAP, LSAP, and control field.
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*/
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if (eflag)
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printf("IPX 802.2: ");
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ipx_print(p+3, length-3);
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return (1);
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}
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#ifdef TCPDUMP_DO_SMB
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if (ssap == LLCSAP_NETBEUI && dsap == LLCSAP_NETBEUI
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&& (!(control & LLC_S_FMT) || control == 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 LLC header.
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*/
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if (is_u) {
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p += 3;
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length -= 3;
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caplen -= 3;
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} else {
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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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netbeui_print(control, p, length);
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return (1);
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}
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#endif
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if (ssap == LLCSAP_ISONS && dsap == LLCSAP_ISONS
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&& control == LLC_UI) {
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isoclns_print(p + 3, length - 3, caplen - 3);
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return (1);
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}
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if (ssap == LLCSAP_SNAP && dsap == LLCSAP_SNAP
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&& control == LLC_UI) {
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/*
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* XXX - what *is* the right bridge pad value here?
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* Does anybody ever bridge one form of LAN traffic
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* over a networking type that uses 802.2 LLC?
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*/
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ret = snap_print(p+3, length-3, caplen-3, extracted_ethertype,
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2);
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if (ret)
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return (ret);
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}
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if (!eflag) {
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if (ssap == dsap) {
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if (esrc == NULL || edst == NULL)
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(void)printf("%s ", tok2str(llc_values, "Unknown DSAP 0x%02x", 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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tok2str(llc_values, "Unknown DSAP 0x%02x", dsap));
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} else {
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if (esrc == NULL || edst == NULL)
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(void)printf("%s > %s ",
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tok2str(llc_values, "Unknown SSAP 0x%02x", ssap),
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tok2str(llc_values, "Unknown DSAP 0x%02x", 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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tok2str(llc_values, "Unknown SSAP 0x%02x", ssap),
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etheraddr_string(edst),
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tok2str(llc_values, "Unknown DSAP 0x%02x", dsap));
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}
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}
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if (is_u) {
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printf("Unnumbered, %s, Flags [%s], length %u",
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tok2str(llc_cmd_values, "%02x", LLC_U_CMD(control)),
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tok2str(llc_flag_values,"?",(ssap_field & LLC_GSAP) | (control & LLC_U_POLL)),
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length);
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p += 3;
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length -= 3;
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caplen -= 3;
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if ((control & ~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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} else {
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if ((control & LLC_S_FMT) == LLC_S_FMT) {
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(void)printf("Supervisory, %s, rcv seq %u, Flags [%s], length %u",
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tok2str(llc_supervisory_values,"?",LLC_S_CMD(control)),
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LLC_IS_NR(control),
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tok2str(llc_flag_values,"?",(ssap_field & LLC_GSAP) | (control & LLC_IS_POLL)),
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length);
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} else {
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(void)printf("Information, send seq %u, rcv seq %u, Flags [%s], length %u",
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LLC_I_NS(control),
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LLC_IS_NR(control),
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tok2str(llc_flag_values,"?",(ssap_field & LLC_GSAP) | (control & LLC_IS_POLL)),
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length);
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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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return(1);
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}
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int
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snap_print(const u_char *p, u_int length, u_int caplen,
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u_short *extracted_ethertype, u_int bridge_pad)
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{
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u_int32_t orgcode;
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register u_short et;
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register int ret;
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TCHECK2(*p, 5);
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orgcode = EXTRACT_24BITS(p);
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et = EXTRACT_16BITS(p + 3);
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if (eflag) {
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const struct tok *tok = null_values;
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const struct oui_tok *otp;
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for (otp = &oui_to_tok[0]; otp->tok != NULL; otp++) {
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if (otp->oui == orgcode) {
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tok = otp->tok;
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break;
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}
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}
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(void)printf("oui %s (0x%06x), %s %s (0x%04x): ",
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tok2str(oui_values, "Unknown", orgcode),
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orgcode,
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(orgcode == 0x000000 ? "ethertype" : "pid"),
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tok2str(tok, "Unknown", et),
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et);
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}
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p += 5;
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length -= 5;
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caplen -= 5;
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switch (orgcode) {
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case OUI_ENCAP_ETHER:
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case OUI_CISCO_90:
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/*
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* This is an encapsulated Ethernet packet,
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* or a packet bridged by some piece of
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* Cisco hardware; the protocol ID is
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* an Ethernet protocol type.
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*/
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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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break;
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case OUI_APPLETALK:
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if (et == ETHERTYPE_ATALK) {
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/*
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* No, I have no idea why Apple used one
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* of their own OUIs, rather than
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* 0x000000, and an Ethernet packet
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* type, for Appletalk data packets,
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* but used 0x000000 and an Ethernet
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* packet type for AARP packets.
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*/
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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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break;
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case OUI_CISCO:
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if (et == PID_CISCO_CDP) {
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cdp_print(p, length, caplen);
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return (1);
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}
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break;
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case OUI_RFC2684:
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switch (et) {
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case PID_RFC2684_ETH_FCS:
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case PID_RFC2684_ETH_NOFCS:
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/*
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* XXX - remove the last two bytes for
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* PID_RFC2684_ETH_FCS?
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*/
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/*
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* Skip the padding.
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*/
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TCHECK2(*p, bridge_pad);
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caplen -= bridge_pad;
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length -= bridge_pad;
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p += bridge_pad;
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/*
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* What remains is an Ethernet packet.
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*/
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ether_print(p, length, caplen);
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return (1);
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case PID_RFC2684_802_5_FCS:
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case PID_RFC2684_802_5_NOFCS:
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/*
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* XXX - remove the last two bytes for
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* PID_RFC2684_ETH_FCS?
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*/
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/*
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* Skip the padding, but not the Access
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* Control field.
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*/
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TCHECK2(*p, bridge_pad);
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caplen -= bridge_pad;
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length -= bridge_pad;
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p += bridge_pad;
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/*
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* What remains is an 802.5 Token Ring
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* packet.
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*/
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token_print(p, length, caplen);
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return (1);
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case PID_RFC2684_FDDI_FCS:
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case PID_RFC2684_FDDI_NOFCS:
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/*
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* XXX - remove the last two bytes for
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* PID_RFC2684_ETH_FCS?
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*/
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/*
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|
* Skip the padding.
|
|
*/
|
|
TCHECK2(*p, bridge_pad + 1);
|
|
caplen -= bridge_pad + 1;
|
|
length -= bridge_pad + 1;
|
|
p += bridge_pad + 1;
|
|
|
|
/*
|
|
* What remains is an FDDI packet.
|
|
*/
|
|
fddi_print(p, length, caplen);
|
|
return (1);
|
|
|
|
case PID_RFC2684_BPDU:
|
|
stp_print(p, length);
|
|
return (1);
|
|
}
|
|
}
|
|
return (0);
|
|
|
|
trunc:
|
|
(void)printf("[|snap]");
|
|
return (1);
|
|
}
|
|
|
|
|
|
/*
|
|
* Local Variables:
|
|
* c-style: whitesmith
|
|
* c-basic-offset: 8
|
|
* End:
|
|
*/
|