OpenBSD-4.6/usr.sbin/tcpdump/print-ether.c
/* $OpenBSD: print-ether.c,v 1.25 2008/12/05 01:25:24 sthen Exp $ */
/*
* Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997
* 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[] =
"@(#) $Id: print-ether.c,v 1.25 2008/12/05 01:25:24 sthen Exp $ (LBL)";
#endif
#include <sys/param.h>
#include <sys/time.h>
#include <sys/socket.h>
struct mbuf;
struct rtentry;
#include <net/if.h>
#include <netinet/in.h>
#include <netinet/if_ether.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/ip_var.h>
#include <netinet/udp.h>
#include <netinet/udp_var.h>
#include <netinet/tcp.h>
#include <stdio.h>
#include <pcap.h>
#ifdef INET6
#include <netinet/ip6.h>
#endif
#include "interface.h"
#include "addrtoname.h"
#include "ethertype.h"
#include "extract.h"
const u_char *packetp;
const u_char *snapend;
void ether_macctl(const u_char *, u_int);
void
ether_print(register const u_char *bp, u_int length)
{
register const struct ether_header *ep;
ep = (const struct ether_header *)bp;
if (qflag) {
TCHECK2(*ep, 12);
(void)printf("%s %s %d: ",
etheraddr_string(ESRC(ep)),
etheraddr_string(EDST(ep)),
length);
} else {
TCHECK2(*ep, 14);
(void)printf("%s %s %s %d: ",
etheraddr_string(ESRC(ep)),
etheraddr_string(EDST(ep)),
etherproto_string(ep->ether_type),
length);
}
return;
trunc:
printf("[|ether] ");
}
u_short extracted_ethertype;
/*
* This is the top level routine of the printer. 'p' is the points
* to the ether header of the packet, 'tvp' is the timestamp,
* 'length' is the length of the packet off the wire, and 'caplen'
* is the number of bytes actually captured.
*/
void
ether_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p)
{
u_int caplen = h->caplen;
u_int length = h->len;
struct ether_header *ep;
u_short ether_type;
ts_print(&h->ts);
if (caplen < sizeof(struct ether_header)) {
printf("[|ether]");
goto out;
}
/*
* Some printers want to get back at the ethernet addresses,
* and/or check that they're not walking off the end of the packet.
* Rather than pass them all the way down, we set these globals.
*/
packetp = p;
snapend = p + caplen;
if (eflag)
ether_print(p, length);
length -= sizeof(struct ether_header);
caplen -= sizeof(struct ether_header);
ep = (struct ether_header *)p;
p += sizeof(struct ether_header);
ether_type = ntohs(ep->ether_type);
/*
* Is it (gag) an 802.3 encapsulation?
*/
extracted_ethertype = 0;
if (ether_type <= ETHERMTU) {
/* Try to print the LLC-layer header & higher layers */
if (llc_print(p, length, caplen, ESRC(ep), EDST(ep)) == 0) {
/* ether_type not known, print raw packet */
if (!eflag)
ether_print((u_char *)ep, length);
if (extracted_ethertype) {
printf("(LLC %s) ",
etherproto_string(htons(extracted_ethertype)));
}
if (!xflag && !qflag)
default_print(p, caplen);
}
} else if (ether_encap_print(ether_type, p, length, caplen) == 0) {
/* ether_type not known, print raw packet */
if (!eflag)
ether_print((u_char *)ep, length + sizeof(*ep));
if (!xflag && !qflag)
default_print(p, caplen);
}
if (xflag)
default_print(p, caplen);
out:
putchar('\n');
}
/*
* 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.
*
* Stuffs the ether type into a global for the benefit of lower layers
* that might want to know what it is.
*/
int
ether_encap_print(u_short ethertype, const u_char *p,
u_int length, u_int caplen)
{
recurse:
extracted_ethertype = ethertype;
switch (ethertype) {
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(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_llap(p, length);
return (1);
case ETHERTYPE_AARP:
aarp_print(p, length);
return (1);
case ETHERTYPE_8021Q:
printf("802.1Q ");
case ETHERTYPE_QINQ:
if (ethertype == ETHERTYPE_QINQ)
printf("QinQ s");
printf("vid %d pri %d%s",
ntohs(*(unsigned short*)p)&0xFFF,
ntohs(*(unsigned short*)p)>>13,
(ntohs(*(unsigned short*)p)&0x1000) ? " cfi " : " ");
ethertype = ntohs(*(unsigned short*)(p+2));
p += 4;
length -= 4;
caplen -= 4;
if (ethertype > ETHERMTU)
goto recurse;
extracted_ethertype = 0;
if (llc_print(p, length, caplen, p-18, p-12) == 0) {
/* ether_type not known, print raw packet */
if (!eflag)
ether_print(p-18, length+4);
if (extracted_ethertype) {
printf("(LLC %s) ",
etherproto_string(htons(extracted_ethertype)));
}
if (!xflag && !qflag)
default_print(p-18, caplen+4);
}
return (1);
#ifdef PPP
case ETHERTYPE_PPPOEDISC:
case ETHERTYPE_PPPOE:
pppoe_if_print(ethertype, p, length, caplen);
return (1);
#endif
case ETHERTYPE_FLOWCONTROL:
ether_macctl(p, length);
return (1);
case ETHERTYPE_MPLS:
case ETHERTYPE_MPLS_MCAST:
mpls_print(p, length);
return (1);
case ETHERTYPE_LLDP:
lldp_print(p, length);
return (1);
case ETHERTYPE_SLOW:
slow_print(p, length);
return (1);
case ETHERTYPE_LAT:
case ETHERTYPE_SCA:
case ETHERTYPE_MOPRC:
case ETHERTYPE_MOPDL:
/* default_print for now */
default:
return (0);
}
}
void
ether_macctl(const u_char *p, u_int length)
{
printf("MACCTL");
if (length < 2)
goto trunc;
if (EXTRACT_16BITS(p) == 0x0001) {
u_int plen;
printf(" PAUSE");
length -= 2;
p += 2;
if (length < 2)
goto trunc;
plen = 512 * EXTRACT_16BITS(p);
printf(" quanta %u", plen);
} else {
printf(" unknown-opcode(0x%04x)", EXTRACT_16BITS(p));
}
return;
trunc:
printf("[|MACCTL]");
}