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435 lines
12 KiB
C
435 lines
12 KiB
C
/*
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* Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000
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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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* $FreeBSD$
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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-ether.c,v 1.106 2008-02-06 10:47:53 guy Exp $ (LBL)";
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#endif
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#define NETDISSECT_REWORKED
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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 <pcap.h>
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#include "interface.h"
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#include "extract.h"
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#include "addrtoname.h"
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#include "ethertype.h"
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#include "ether.h"
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const struct tok ethertype_values[] = {
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{ ETHERTYPE_IP, "IPv4" },
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{ ETHERTYPE_MPLS, "MPLS unicast" },
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{ ETHERTYPE_MPLS_MULTI, "MPLS multicast" },
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{ ETHERTYPE_IPV6, "IPv6" },
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{ ETHERTYPE_8021Q, "802.1Q" },
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{ ETHERTYPE_8021Q9100, "802.1Q-9100" },
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{ ETHERTYPE_8021QinQ, "802.1Q-QinQ" },
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{ ETHERTYPE_8021Q9200, "802.1Q-9200" },
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{ ETHERTYPE_VMAN, "VMAN" },
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{ ETHERTYPE_PUP, "PUP" },
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{ ETHERTYPE_ARP, "ARP"},
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{ ETHERTYPE_REVARP, "Reverse ARP"},
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{ ETHERTYPE_NS, "NS" },
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{ ETHERTYPE_SPRITE, "Sprite" },
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{ ETHERTYPE_TRAIL, "Trail" },
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{ ETHERTYPE_MOPDL, "MOP DL" },
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{ ETHERTYPE_MOPRC, "MOP RC" },
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{ ETHERTYPE_DN, "DN" },
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{ ETHERTYPE_LAT, "LAT" },
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{ ETHERTYPE_SCA, "SCA" },
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{ ETHERTYPE_TEB, "TEB" },
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{ ETHERTYPE_LANBRIDGE, "Lanbridge" },
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{ ETHERTYPE_DECDNS, "DEC DNS" },
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{ ETHERTYPE_DECDTS, "DEC DTS" },
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{ ETHERTYPE_VEXP, "VEXP" },
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{ ETHERTYPE_VPROD, "VPROD" },
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{ ETHERTYPE_ATALK, "Appletalk" },
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{ ETHERTYPE_AARP, "Appletalk ARP" },
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{ ETHERTYPE_IPX, "IPX" },
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{ ETHERTYPE_PPP, "PPP" },
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{ ETHERTYPE_MPCP, "MPCP" },
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{ ETHERTYPE_SLOW, "Slow Protocols" },
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{ ETHERTYPE_PPPOED, "PPPoE D" },
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{ ETHERTYPE_PPPOES, "PPPoE S" },
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{ ETHERTYPE_EAPOL, "EAPOL" },
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{ ETHERTYPE_RRCP, "RRCP" },
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{ ETHERTYPE_JUMBO, "Jumbo" },
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{ ETHERTYPE_LOOPBACK, "Loopback" },
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{ ETHERTYPE_ISO, "OSI" },
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{ ETHERTYPE_GRE_ISO, "GRE-OSI" },
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{ ETHERTYPE_CFM_OLD, "CFM (old)" },
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{ ETHERTYPE_CFM, "CFM" },
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{ ETHERTYPE_LLDP, "LLDP" },
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{ ETHERTYPE_TIPC, "TIPC"},
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{ 0, NULL}
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};
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static inline void
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ether_hdr_print(netdissect_options *ndo,
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const u_char *bp, u_int length)
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{
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register const struct ether_header *ep;
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u_int16_t ether_type;
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ep = (const struct ether_header *)bp;
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(void)ND_PRINT((ndo, "%s > %s",
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etheraddr_string(ESRC(ep)),
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etheraddr_string(EDST(ep))));
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ether_type = EXTRACT_16BITS(&ep->ether_type);
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if (!ndo->ndo_qflag) {
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if (ether_type <= ETHERMTU)
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(void)ND_PRINT((ndo, ", 802.3"));
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else
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(void)ND_PRINT((ndo, ", ethertype %s (0x%04x)",
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tok2str(ethertype_values,"Unknown", ether_type),
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ether_type));
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} else {
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if (ether_type <= ETHERMTU)
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(void)ND_PRINT((ndo, ", 802.3"));
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else
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(void)ND_PRINT((ndo, ", %s", tok2str(ethertype_values,"Unknown Ethertype (0x%04x)", ether_type)));
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}
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(void)ND_PRINT((ndo, ", length %u: ", length));
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}
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/*
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* Print an Ethernet frame.
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* This might be encapsulated within another frame; we might be passed
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* a pointer to a function that can print header information for that
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* frame's protocol, and an argument to pass to that function.
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*/
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void
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ether_print(netdissect_options *ndo,
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const u_char *p, u_int length, u_int caplen,
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void (*print_encap_header)(netdissect_options *ndo, const u_char *), const u_char *encap_header_arg)
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{
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struct ether_header *ep;
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u_int orig_length;
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u_short ether_type;
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u_short extracted_ether_type;
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if (caplen < ETHER_HDRLEN || length < ETHER_HDRLEN) {
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ND_PRINT((ndo, "[|ether]"));
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return;
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}
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if (ndo->ndo_eflag) {
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if (print_encap_header != NULL)
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(*print_encap_header)(ndo, encap_header_arg);
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ether_hdr_print(ndo, p, length);
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}
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orig_length = length;
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length -= ETHER_HDRLEN;
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caplen -= ETHER_HDRLEN;
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ep = (struct ether_header *)p;
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p += ETHER_HDRLEN;
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ether_type = EXTRACT_16BITS(&ep->ether_type);
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recurse:
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/*
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* Is it (gag) an 802.3 encapsulation?
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*/
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if (ether_type <= ETHERMTU) {
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/* Try to print the LLC-layer header & higher layers */
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if (llc_print(p, length, caplen, ESRC(ep), EDST(ep),
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&extracted_ether_type) == 0) {
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/* ether_type not known, print raw packet */
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if (!ndo->ndo_eflag) {
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if (print_encap_header != NULL)
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(*print_encap_header)(ndo, encap_header_arg);
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ether_hdr_print(ndo, (u_char *)ep, orig_length);
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}
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if (!ndo->ndo_suppress_default_print)
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ndo->ndo_default_print(ndo, p, caplen);
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}
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} else if (ether_type == ETHERTYPE_8021Q ||
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ether_type == ETHERTYPE_8021Q9100 ||
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ether_type == ETHERTYPE_8021Q9200 ||
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ether_type == ETHERTYPE_8021QinQ) {
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/*
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* Print VLAN information, and then go back and process
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* the enclosed type field.
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*/
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if (caplen < 4 || length < 4) {
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ND_PRINT((ndo, "[|vlan]"));
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return;
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}
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if (ndo->ndo_eflag) {
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u_int16_t tag = EXTRACT_16BITS(p);
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ND_PRINT((ndo, "vlan %u, p %u%s, ",
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tag & 0xfff,
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tag >> 13,
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(tag & 0x1000) ? ", CFI" : ""));
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}
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ether_type = EXTRACT_16BITS(p + 2);
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if (ndo->ndo_eflag && ether_type > ETHERMTU)
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ND_PRINT((ndo, "ethertype %s, ", tok2str(ethertype_values,"0x%04x", ether_type)));
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p += 4;
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length -= 4;
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caplen -= 4;
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goto recurse;
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} else if (ether_type == ETHERTYPE_JUMBO) {
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/*
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* Alteon jumbo frames.
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* See
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*
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* http://tools.ietf.org/html/draft-ietf-isis-ext-eth-01
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*
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* which indicates that, following the type field,
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* there's an LLC header and payload.
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*/
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/* Try to print the LLC-layer header & higher layers */
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if (llc_print(p, length, caplen, ESRC(ep), EDST(ep),
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&extracted_ether_type) == 0) {
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/* ether_type not known, print raw packet */
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if (!ndo->ndo_eflag) {
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if (print_encap_header != NULL)
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(*print_encap_header)(ndo, encap_header_arg);
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ether_hdr_print(ndo, (u_char *)ep, orig_length);
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}
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if (!ndo->ndo_suppress_default_print)
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ndo->ndo_default_print(ndo, p, caplen);
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}
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} else {
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if (ethertype_print(ndo, ether_type, p, length, caplen) == 0) {
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/* ether_type not known, print raw packet */
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if (!ndo->ndo_eflag) {
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if (print_encap_header != NULL)
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(*print_encap_header)(ndo, encap_header_arg);
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ether_hdr_print(ndo, (u_char *)ep, orig_length);
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}
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if (!ndo->ndo_suppress_default_print)
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ndo->ndo_default_print(ndo, p, caplen);
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}
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}
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}
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/*
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* This is the top level routine of the printer. 'p' points
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* to the ether header of the packet, 'h->ts' is the timestamp,
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* 'h->len' is the length of the packet off the wire, and 'h->caplen'
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* is the number of bytes actually captured.
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*/
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u_int
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ether_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h,
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const u_char *p)
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{
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ether_print(ndo, p, h->len, h->caplen, NULL, NULL);
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return (ETHER_HDRLEN);
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}
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/*
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* This is the top level routine of the printer. 'p' points
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* to the ether header of the packet, 'h->ts' is the timestamp,
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* 'h->len' is the length of the packet off the wire, and 'h->caplen'
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* is the number of bytes actually captured.
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*
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* This is for DLT_NETANALYZER, which has a 4-byte pseudo-header
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* before the Ethernet header.
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*/
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u_int
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netanalyzer_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h,
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const u_char *p)
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{
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/*
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* Fail if we don't have enough data for the Hilscher pseudo-header.
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*/
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if (h->len < 4 || h->caplen < 4) {
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printf("[|netanalyzer]");
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return (h->caplen);
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}
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/* Skip the pseudo-header. */
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ether_print(ndo, p + 4, h->len - 4, h->caplen - 4, NULL, NULL);
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return (4 + ETHER_HDRLEN);
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}
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/*
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* This is the top level routine of the printer. 'p' points
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* to the ether header of the packet, 'h->ts' is the timestamp,
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* 'h->len' is the length of the packet off the wire, and 'h->caplen'
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* is the number of bytes actually captured.
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*
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* This is for DLT_NETANALYZER_TRANSPARENT, which has a 4-byte
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* pseudo-header, a 7-byte Ethernet preamble, and a 1-byte Ethernet SOF
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* before the Ethernet header.
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*/
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u_int
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netanalyzer_transparent_if_print(netdissect_options *ndo,
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const struct pcap_pkthdr *h,
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const u_char *p)
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{
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/*
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* Fail if we don't have enough data for the Hilscher pseudo-header,
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* preamble, and SOF.
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*/
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if (h->len < 12 || h->caplen < 12) {
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printf("[|netanalyzer-transparent]");
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return (h->caplen);
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}
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/* Skip the pseudo-header, preamble, and SOF. */
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ether_print(ndo, p + 12, h->len - 12, h->caplen - 12, NULL, NULL);
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return (12 + ETHER_HDRLEN);
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}
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/*
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* Prints the packet payload, given an Ethernet type code for the payload's
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* protocol.
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*
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* Returns non-zero if it can do so, zero if the ethertype is unknown.
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*/
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int
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ethertype_print(netdissect_options *ndo,
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u_short ether_type, const u_char *p,
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u_int length, u_int caplen)
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{
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switch (ether_type) {
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case ETHERTYPE_IP:
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ip_print(ndo, p, length);
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return (1);
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#ifdef INET6
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case ETHERTYPE_IPV6:
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ip6_print(ndo, p, length);
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return (1);
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#endif /*INET6*/
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case ETHERTYPE_ARP:
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case ETHERTYPE_REVARP:
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arp_print(ndo, p, length, caplen);
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return (1);
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case ETHERTYPE_DN:
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decnet_print(/*ndo,*/p, length, caplen);
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return (1);
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case ETHERTYPE_ATALK:
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if (ndo->ndo_vflag)
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fputs("et1 ", stdout);
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atalk_print(/*ndo,*/p, length);
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return (1);
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case ETHERTYPE_AARP:
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aarp_print(/*ndo,*/p, length);
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return (1);
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case ETHERTYPE_IPX:
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ND_PRINT((ndo, "(NOV-ETHII) "));
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ipx_print(/*ndo,*/p, length);
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return (1);
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case ETHERTYPE_ISO:
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isoclns_print(/*ndo,*/p+1, length-1, length-1);
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return(1);
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case ETHERTYPE_PPPOED:
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case ETHERTYPE_PPPOES:
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case ETHERTYPE_PPPOED2:
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case ETHERTYPE_PPPOES2:
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pppoe_print(/*ndo,*/p, length);
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return (1);
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case ETHERTYPE_EAPOL:
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eap_print(ndo, p, length);
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return (1);
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case ETHERTYPE_RRCP:
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rrcp_print(ndo, p - 14 , length + 14);
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return (1);
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case ETHERTYPE_PPP:
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if (length) {
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printf(": ");
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ppp_print(/*ndo,*/p, length);
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}
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return (1);
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case ETHERTYPE_MPCP:
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mpcp_print(/*ndo,*/p, length);
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return (1);
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case ETHERTYPE_SLOW:
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slow_print(/*ndo,*/p, length);
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return (1);
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case ETHERTYPE_CFM:
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case ETHERTYPE_CFM_OLD:
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cfm_print(/*ndo,*/p, length);
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return (1);
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case ETHERTYPE_LLDP:
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lldp_print(/*ndo,*/p, length);
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return (1);
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case ETHERTYPE_LOOPBACK:
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return (1);
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case ETHERTYPE_MPLS:
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case ETHERTYPE_MPLS_MULTI:
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mpls_print(/*ndo,*/p, length);
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return (1);
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case ETHERTYPE_TIPC:
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tipc_print(ndo, p, length, caplen);
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return (1);
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case ETHERTYPE_LAT:
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case ETHERTYPE_SCA:
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case ETHERTYPE_MOPRC:
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case ETHERTYPE_MOPDL:
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/* default_print for now */
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default:
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return (0);
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}
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}
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/*
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* Local Variables:
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* c-style: whitesmith
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* c-basic-offset: 8
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* End:
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*/
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