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36ff8749d3
tcpdump/print-ether.c
hannes 36ff8749d3 -resolve (print the name) the OUI field in the SNAP printer 
-add the rfc 2684 PIDs as pseudo ethertypes
-display cosmetics:
 place a ":" after the LLC printer to indicate that
 a new proto layer starts
2005-01-25 16:22:56 +00:00

338 lines
9.4 KiB
C
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/*
* Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that: (1) source code distributions
* retain the above copyright notice and this paragraph in its entirety, (2)
* distributions including binary code include the above copyright notice and
* this paragraph in its entirety in the documentation or other materials
* provided with the distribution, and (3) all advertising materials mentioning
* features or use of this software display the following acknowledgement:
* ``This product includes software developed by the University of California,
* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
* the University nor the names of its contributors may be used to endorse
* or promote products derived from this software without specific prior
* written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#ifndef lint
static const char rcsid[] _U_ =
"@(#) $Header: /tcpdump/master/tcpdump/print-ether.c,v 1.94 2005-01-25 16:22:56 hannes Exp $ (LBL)";
#endif
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <tcpdump-stdinc.h>
#include <stdio.h>
#include <pcap.h>
#include "interface.h"
#include "addrtoname.h"
#include "ethertype.h"
#include "ether.h"
#include "llc.h"
const struct tok ethertype_values[] = {
/* not really ethertypes but PIDs that are used
in the SNAP printer - its more convenient
to put them into a single tokentable */
{ PID_RFC2684_ETH_FCS, "Ethernet + FCS" },
{ PID_RFC2684_ETH_NOFCS, "Ethernet no FCS" },
{ PID_RFC2684_802_4_FCS, "802.4 + FCS" },
{ PID_RFC2684_802_4_NOFCS, "w/o FCS" },
{ PID_RFC2684_802_5_FCS, "Tokenring + FCS" },
{ PID_RFC2684_802_5_NOFCS, "Tokenring no FCS" },
{ PID_RFC2684_FDDI_FCS, "FDDI + FCS" },
{ PID_RFC2684_FDDI_NOFCS, "FDDI no FCS" },
{ PID_RFC2684_802_6_FCS, "802.6 + FCS" },
{ PID_RFC2684_802_6_NOFCS, "802.6 no FCS" },
{ PID_RFC2684_BPDU, "BPDU" },
/* the real Ethertypes */
{ ETHERTYPE_IP, "IPv4" },
{ ETHERTYPE_MPLS, "MPLS unicast" },
{ ETHERTYPE_MPLS_MULTI, "MPLS multicast" },
{ ETHERTYPE_IPV6, "IPv6" },
{ ETHERTYPE_8021Q, "802.1Q" },
{ ETHERTYPE_VMAN, "VMAN" },
{ ETHERTYPE_PUP, "PUP" },
{ ETHERTYPE_ARP, "ARP"},
{ ETHERTYPE_REVARP , "Reverse ARP"},
{ ETHERTYPE_NS, "NS" },
{ ETHERTYPE_SPRITE, "Sprite" },
{ ETHERTYPE_TRAIL, "Trail" },
{ ETHERTYPE_MOPDL, "MOP DL" },
{ ETHERTYPE_MOPRC, "MOP RC" },
{ ETHERTYPE_DN, "DN" },
{ ETHERTYPE_LAT, "LAT" },
{ ETHERTYPE_SCA, "SCA" },
{ ETHERTYPE_LANBRIDGE, "Lanbridge" },
{ ETHERTYPE_DECDNS, "DEC DNS" },
{ ETHERTYPE_DECDTS, "DEC DTS" },
{ ETHERTYPE_VEXP, "VEXP" },
{ ETHERTYPE_VPROD, "VPROD" },
{ ETHERTYPE_ATALK, "Appletalk" },
{ ETHERTYPE_AARP, "Appletalk ARP" },
{ ETHERTYPE_IPX, "IPX" },
{ ETHERTYPE_PPP, "PPP" },
{ ETHERTYPE_PPPOED, "PPPoE D" },
{ ETHERTYPE_PPPOES, "PPPoE S" },
{ ETHERTYPE_EAPOL, "EAPOL" },
{ ETHERTYPE_JUMBO, "Jumbo" },
{ ETHERTYPE_LOOPBACK, "Loopback" },
{ ETHERTYPE_ISO, "OSI" },
{ ETHERTYPE_GRE_ISO, "GRE-OSI" },
{ 0, NULL}
};
static inline void
ether_hdr_print(register const u_char *bp, u_int length)
{
register const struct ether_header *ep;
ep = (const struct ether_header *)bp;
(void)printf("%s > %s",
etheraddr_string(ESRC(ep)),
etheraddr_string(EDST(ep)));
if (!qflag) {
if (ntohs(ep->ether_type) <= ETHERMTU)
(void)printf(", 802.3");
else
(void)printf(", ethertype %s (0x%04x)",
tok2str(ethertype_values,"Unknown", ntohs(ep->ether_type)),
ntohs(ep->ether_type));
} else {
if (ntohs(ep->ether_type) <= ETHERMTU)
(void)printf(", 802.3");
else
(void)printf(", %s", tok2str(ethertype_values,"Unknown Ethertype (0x%04x)", ntohs(ep->ether_type)));
}
(void)printf(", length %u: ", length);
}
void
ether_print(const u_char *p, u_int length, u_int caplen)
{
struct ether_header *ep;
u_short ether_type;
u_short extracted_ether_type;
if (caplen < ETHER_HDRLEN) {
printf("[|ether]");
return;
}
if (eflag)
ether_hdr_print(p, length);
length -= ETHER_HDRLEN;
caplen -= ETHER_HDRLEN;
ep = (struct ether_header *)p;
p += ETHER_HDRLEN;
ether_type = ntohs(ep->ether_type);
/*
* Is it (gag) an 802.3 encapsulation?
*/
extracted_ether_type = 0;
if (ether_type <= ETHERMTU) {
/* Try to print the LLC-layer header & higher layers */
if (llc_print(p, length, caplen, ESRC(ep), EDST(ep),
&extracted_ether_type) == 0) {
/* ether_type not known, print raw packet */
if (!eflag)
ether_hdr_print((u_char *)ep, length + ETHER_HDRLEN);
if (!xflag && !qflag)
default_print(p, caplen);
}
} else if (ether_encap_print(ether_type, p, length, caplen,
&extracted_ether_type) == 0) {
/* ether_type not known, print raw packet */
if (!eflag)
ether_hdr_print((u_char *)ep, length + ETHER_HDRLEN);
if (!xflag && !qflag)
default_print(p, caplen);
}
}
/*
* This is the top level routine of the printer. 'p' points
* to the ether header of the packet, 'h->ts' is the timestamp,
* 'h->len' is the length of the packet off the wire, and 'h->caplen'
* is the number of bytes actually captured.
*/
u_int
ether_if_print(const struct pcap_pkthdr *h, const u_char *p)
{
ether_print(p, h->len, h->caplen);
return (ETHER_HDRLEN);
}
/*
* Prints the packet encapsulated in an Ethernet data segment
* (or an equivalent encapsulation), given the Ethernet type code.
*
* Returns non-zero if it can do so, zero if the ethertype is unknown.
*
* The Ethernet type code is passed through a pointer; if it was
* ETHERTYPE_8021Q, it gets updated to be the Ethernet type of
* the 802.1Q payload, for the benefit of lower layers that might
* want to know what it is.
*/
int
ether_encap_print(u_short ether_type, const u_char *p,
u_int length, u_int caplen, u_short *extracted_ether_type)
{
recurse:
*extracted_ether_type = ether_type;
switch (ether_type) {
case ETHERTYPE_IP:
ip_print(p, length);
return (1);
#ifdef INET6
case ETHERTYPE_IPV6:
ip6_print(p, length);
return (1);
#endif /*INET6*/
case ETHERTYPE_ARP:
case ETHERTYPE_REVARP:
arp_print(gndo, p, length, caplen);
return (1);
case ETHERTYPE_DN:
decnet_print(p, length, caplen);
return (1);
case ETHERTYPE_ATALK:
if (vflag)
fputs("et1 ", stdout);
atalk_print(p, length);
return (1);
case ETHERTYPE_AARP:
aarp_print(p, length);
return (1);
case ETHERTYPE_IPX:
printf("(NOV-ETHII) ");
ipx_print(p, length);
return (1);
case ETHERTYPE_8021Q:
if (eflag)
printf("vlan %u, p %u%s, ",
ntohs(*(u_int16_t *)p) & 0xfff,
ntohs(*(u_int16_t *)p) >> 13,
(ntohs(*(u_int16_t *)p) & 0x1000) ? ", CFI" : "");
ether_type = ntohs(*(u_int16_t *)(p + 2));
p += 4;
length -= 4;
caplen -= 4;
if (ether_type > ETHERMTU) {
if (eflag)
printf("ethertype %s, ",
tok2str(ethertype_values,"0x%04x", ether_type));
goto recurse;
}
*extracted_ether_type = 0;
if (llc_print(p, length, caplen, p - 18, p - 12,
extracted_ether_type) == 0) {
ether_hdr_print(p - 18, length + 4);
}
if (!xflag && !qflag)
default_print(p - 18, caplen + 4);
return (1);
case ETHERTYPE_JUMBO:
ether_type = ntohs(*(u_int16_t *)(p));
p += 2;
length -= 2;
caplen -= 2;
if (ether_type > ETHERMTU) {
if (eflag)
printf("ethertype %s, ",
tok2str(ethertype_values,"0x%04x", ether_type));
goto recurse;
}
*extracted_ether_type = 0;
if (llc_print(p, length, caplen, p - 16, p - 10,
extracted_ether_type) == 0) {
ether_hdr_print(p - 16, length + 2);
}
if (!xflag && !qflag)
default_print(p - 16, caplen + 2);
return (1);
case ETHERTYPE_ISO:
isoclns_print(p+1, length-1, length-1);
return(1);
case ETHERTYPE_PPPOED:
case ETHERTYPE_PPPOES:
pppoe_print(p, length);
return (1);
case ETHERTYPE_EAPOL:
eap_print(gndo, p, length);
return (1);
case ETHERTYPE_PPP:
if (length) {
printf(": ");
ppp_print(p, length);
}
return (1);
case ETHERTYPE_LOOPBACK:
return (0);
case ETHERTYPE_MPLS:
case ETHERTYPE_MPLS_MULTI:
mpls_print(p, length);
return (1);
case ETHERTYPE_LAT:
case ETHERTYPE_SCA:
case ETHERTYPE_MOPRC:
case ETHERTYPE_MOPDL:
/* default_print for now */
default:
return (0);
}
}
/*
* Local Variables:
* c-style: bsd
* End:
*/
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