mirror of
https://github.com/the-tcpdump-group/tcpdump.git
synced 2024-12-12 03:13:29 +08:00
354 lines
9.5 KiB
C
354 lines
9.5 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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#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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#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 "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_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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{ 0, NULL}
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};
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static inline void
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ether_hdr_print(register 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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ep = (const struct ether_header *)bp;
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(void)printf("%s > %s",
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etheraddr_string(ESRC(ep)),
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etheraddr_string(EDST(ep)));
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if (!qflag) {
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if (ntohs(ep->ether_type) <= ETHERMTU)
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(void)printf(", 802.3");
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else
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(void)printf(", ethertype %s (0x%04x)",
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tok2str(ethertype_values,"Unknown", ntohs(ep->ether_type)),
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ntohs(ep->ether_type));
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} else {
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if (ntohs(ep->ether_type) <= ETHERMTU)
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(void)printf(", 802.3");
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else
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(void)printf(", %s", tok2str(ethertype_values,"Unknown Ethertype (0x%04x)", ntohs(ep->ether_type)));
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}
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(void)printf(", length %u: ", length);
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}
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void
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ether_print(const u_char *p, u_int length, u_int caplen)
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{
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struct ether_header *ep;
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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) {
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printf("[|ether]");
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return;
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}
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if (eflag)
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ether_hdr_print(p, 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 = ntohs(ep->ether_type);
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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 (!eflag)
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ether_hdr_print((u_char *)ep, length + ETHER_HDRLEN);
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if (!suppress_default_print)
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default_print(p, caplen);
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}
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} else if (ether_encap_print(ether_type, p, length, caplen,
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&extracted_ether_type) == 0) {
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/* ether_type not known, print raw packet */
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if (!eflag)
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ether_hdr_print((u_char *)ep, length + ETHER_HDRLEN);
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if (!suppress_default_print)
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default_print(p, caplen);
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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(const struct pcap_pkthdr *h, const u_char *p)
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{
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ether_print(p, h->len, h->caplen);
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return (ETHER_HDRLEN);
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}
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/*
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* Prints the packet encapsulated in an Ethernet data segment
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* (or an equivalent encapsulation), given the Ethernet type code.
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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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* The Ethernet type code is passed through a pointer; if it was
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* ETHERTYPE_8021Q, it gets updated to be the Ethernet type of
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* the 802.1Q payload, for the benefit of lower layers that might
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* want to know what it is.
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*/
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int
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ether_encap_print(u_short ether_type, const u_char *p,
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u_int length, u_int caplen, u_short *extracted_ether_type)
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{
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recurse:
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*extracted_ether_type = ether_type;
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switch (ether_type) {
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case ETHERTYPE_IP:
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ip_print(gndo, 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(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(gndo, p, length, caplen);
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return (1);
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case ETHERTYPE_DN:
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decnet_print(p, length, caplen);
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return (1);
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case ETHERTYPE_ATALK:
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if (vflag)
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fputs("et1 ", stdout);
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atalk_print(p, length);
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return (1);
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case ETHERTYPE_AARP:
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aarp_print(p, length);
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return (1);
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case ETHERTYPE_IPX:
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printf("(NOV-ETHII) ");
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ipx_print(p, length);
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return (1);
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case ETHERTYPE_8021Q:
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if (eflag)
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printf("vlan %u, p %u%s, ",
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ntohs(*(u_int16_t *)p) & 0xfff,
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ntohs(*(u_int16_t *)p) >> 13,
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(ntohs(*(u_int16_t *)p) & 0x1000) ? ", CFI" : "");
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ether_type = ntohs(*(u_int16_t *)(p + 2));
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p += 4;
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length -= 4;
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caplen -= 4;
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if (ether_type > ETHERMTU) {
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if (eflag)
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printf("ethertype %s, ",
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tok2str(ethertype_values,"0x%04x", ether_type));
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goto recurse;
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}
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*extracted_ether_type = 0;
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if (llc_print(p, length, caplen, p - 18, p - 12,
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extracted_ether_type) == 0) {
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ether_hdr_print(p - 18, length + 4);
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if (!suppress_default_print) {
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default_print(p - 18, caplen + 4);
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}
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}
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return (1);
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case ETHERTYPE_JUMBO:
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ether_type = ntohs(*(u_int16_t *)(p));
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p += 2;
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length -= 2;
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caplen -= 2;
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if (ether_type > ETHERMTU) {
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if (eflag)
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printf("ethertype %s, ",
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tok2str(ethertype_values,"0x%04x", ether_type));
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goto recurse;
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}
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*extracted_ether_type = 0;
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if (llc_print(p, length, caplen, p - 16, p - 10,
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extracted_ether_type) == 0) {
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ether_hdr_print(p - 16, length + 2);
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if (!suppress_default_print) {
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default_print(p - 16, caplen + 2);
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}
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}
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return (1);
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case ETHERTYPE_ISO:
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isoclns_print(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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pppoe_print(p, length);
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return (1);
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case ETHERTYPE_EAPOL:
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eap_print(gndo, p, length);
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return (1);
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case ETHERTYPE_RRCP:
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rrcp_print(gndo, 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(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(p, length);
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return (1);
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case ETHERTYPE_SLOW:
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slow_print(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(p, length);
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return (1);
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case ETHERTYPE_LLDP:
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lldp_print(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(p, length);
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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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