240 lines
6.0 KiB
C
240 lines
6.0 KiB
C
/*
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* Copyright (c) 1988, 1989, 1990, 1991, 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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* $FreeBSD$
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*/
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#ifndef lint
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static const char rcsid[] =
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"@(#) $Header: /tcpdump/master/tcpdump/print-ether.c,v 1.61 2000/12/22 22:45:10 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 <sys/param.h>
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#include <sys/time.h>
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#include <sys/socket.h>
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struct mbuf;
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struct rtentry;
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#include <netinet/in.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 u_char *packetp;
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const u_char *snapend;
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static inline void
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ether_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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if (qflag)
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(void)printf("%s %s %d: ",
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etheraddr_string(ESRC(ep)),
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etheraddr_string(EDST(ep)),
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length);
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else
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(void)printf("%s %s %s %d: ",
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etheraddr_string(ESRC(ep)),
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etheraddr_string(EDST(ep)),
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etherproto_string(ep->ether_type),
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length);
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}
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/*
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* This is the top level routine of the printer. 'p' is the points
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* to the ether header of the packet, 'h->tv' is the timestamp,
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* 'h->length' 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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void
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ether_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p)
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{
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u_int caplen = h->caplen;
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u_int length = h->len;
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struct ether_header *ep;
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u_short ether_type;
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u_short extracted_ethertype;
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ts_print(&h->ts);
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if (caplen < ETHER_HDRLEN) {
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printf("[|ether]");
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goto out;
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}
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if (eflag)
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ether_print(p, length);
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/*
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* Some printers want to get back at the ethernet addresses,
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* and/or check that they're not walking off the end of the packet.
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* Rather than pass them all the way down, we set these globals.
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*/
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packetp = p;
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snapend = p + caplen;
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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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extracted_ethertype = 0;
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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_ethertype) == 0) {
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/* ether_type not known, print raw packet */
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if (!eflag)
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ether_print((u_char *)ep, length + ETHER_HDRLEN);
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if (extracted_ethertype) {
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printf("(LLC %s) ",
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etherproto_string(htons(extracted_ethertype)));
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}
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if (!xflag && !qflag)
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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_ethertype) == 0) {
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/* ether_type not known, print raw packet */
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if (!eflag)
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ether_print((u_char *)ep, length + ETHER_HDRLEN);
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if (!xflag && !qflag)
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default_print(p, caplen);
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}
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if (xflag)
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default_print(p, caplen);
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out:
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putchar('\n');
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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 ethertype, const u_char *p,
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u_int length, u_int caplen, u_short *extracted_ethertype)
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{
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recurse:
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*extracted_ethertype = ethertype;
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switch (ethertype) {
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case ETHERTYPE_IP:
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ip_print(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(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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ipx_print(p, length);
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return (1);
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case ETHERTYPE_8021Q:
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printf("802.1Q vlan#%d P%d%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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ethertype = 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 (ethertype > ETHERMTU)
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goto recurse;
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*extracted_ethertype = 0;
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if (llc_print(p, length, caplen, p - 18, p - 12,
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extracted_ethertype) == 0) {
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/* ether_type not known, print raw packet */
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if (!eflag)
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ether_print(p - 18, length + 4);
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if (*extracted_ethertype) {
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printf("(LLC %s) ",
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etherproto_string(htons(*extracted_ethertype)));
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}
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if (!xflag && !qflag)
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default_print(p - 18, caplen + 4);
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}
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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_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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