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/*
* 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[] _U_ =
"@(#) $Header: /tcpdump/master/tcpdump/print-sll.c,v 1.19 2005-11-13 12:12:43 guy Exp $ (LBL)";
#endif
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <tcpdump-stdinc.h>
#include <stdio.h>
#include <string.h>
#include <pcap.h>
#include "interface.h"
#include "addrtoname.h"
#include "ethertype.h"
#include "extract.h"
#include "ether.h"
#include "sll.h"
const struct tok sll_pkttype_values[] = {
{ LINUX_SLL_HOST, "In" },
{ LINUX_SLL_BROADCAST, "B" },
{ LINUX_SLL_MULTICAST, "M" },
{ LINUX_SLL_OTHERHOST, "P" },
{ LINUX_SLL_OUTGOING, "Out" },
{ 0, NULL}
};
static inline void
sll_print(register const struct sll_header *sllp, u_int length)
{
u_short ether_type;
printf("%3s ",tok2str(sll_pkttype_values,"?",EXTRACT_16BITS(&sllp->sll_pkttype)));
/*
* XXX - check the link-layer address type value?
* For now, we just assume 6 means Ethernet.
* XXX - print others as strings of hex?
*/
if (EXTRACT_16BITS(&sllp->sll_halen) == 6)
(void)printf("%s ", etheraddr_string(sllp->sll_addr));
if (!qflag) {
ether_type = EXTRACT_16BITS(&sllp->sll_protocol);
if (ether_type <= ETHERMTU) {
/*
* Not an Ethernet type; what type is it?
*/
switch (ether_type) {
case LINUX_SLL_P_802_3:
/*
* Ethernet_802.3 IPX frame.
*/
(void)printf("802.3");
break;
case LINUX_SLL_P_802_2:
/*
* 802.2.
*/
(void)printf("802.2");
break;
default:
/*
* What is it?
*/
(void)printf("ethertype Unknown (0x%04x)",
ether_type);
break;
}
} else {
(void)printf("ethertype %s (0x%04x)",
tok2str(ethertype_values, "Unknown", ether_type),
ether_type);
}
(void)printf(", length %u: ", length);
}
}
/*
* This is the top level routine of the printer. 'p' points to the
* Linux "cooked capture" 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
sll_if_print(const struct pcap_pkthdr *h, const u_char *p)
{
u_int caplen = h->caplen;
u_int length = h->len;
register const struct sll_header *sllp;
u_short ether_type;
u_short extracted_ethertype;
if (caplen < SLL_HDR_LEN) {
/*
* XXX - this "can't happen" because "pcap-linux.c" always
* adds this many bytes of header to every packet in a
* cooked socket capture.
*/
printf("[|sll]");
return (caplen);
}
sllp = (const struct sll_header *)p;
if (eflag)
sll_print(sllp, length);
/*
* Go past the cooked-mode header.
*/
length -= SLL_HDR_LEN;
caplen -= SLL_HDR_LEN;
p += SLL_HDR_LEN;
ether_type = EXTRACT_16BITS(&sllp->sll_protocol);
recurse:
/*
* Is it (gag) an 802.3 encapsulation, or some non-Ethernet
* packet type?
*/
if (ether_type <= ETHERMTU) {
/*
* Yes - what type is it?
*/
switch (ether_type) {
case LINUX_SLL_P_802_3:
/*
* Ethernet_802.3 IPX frame.
*/
ipx_print(p, length);
break;
case LINUX_SLL_P_802_2:
/*
* 802.2.
* Try to print the LLC-layer header & higher layers.
*/
if (llc_print(p, length, caplen, NULL, NULL,
&extracted_ethertype) == 0)
goto unknown; /* unknown LLC type */
break;
default:
extracted_ethertype = 0;
/*FALLTHROUGH*/
unknown:
/* ether_type not known, print raw packet */
if (!eflag)
sll_print(sllp, length + SLL_HDR_LEN);
if (extracted_ethertype) {
printf("(LLC %s) ",
etherproto_string(htons(extracted_ethertype)));
}
if (!suppress_default_print)
default_print(p, caplen);
break;
}
} else if (ether_type == ETHERTYPE_8021Q) {
/*
* Print VLAN information, and then go back and process
* the enclosed type field.
*/
if (caplen < 4 || length < 4) {
printf("[|vlan]");
return (SLL_HDR_LEN);
}
if (eflag) {
u_int16_t tag = EXTRACT_16BITS(p);
printf("vlan %u, p %u%s, ",
tag & 0xfff,
tag >> 13,
(tag & 0x1000) ? ", CFI" : "");
}
ether_type = EXTRACT_16BITS(p + 2);
if (ether_type <= ETHERMTU)
ether_type = LINUX_SLL_P_802_2;
if (!qflag) {
(void)printf("ethertype %s, ",
tok2str(ethertype_values, "Unknown", ether_type));
}
p += 4;
length -= 4;
caplen -= 4;
goto recurse;
} else {
if (ethertype_print(gndo, ether_type, p, length, caplen) == 0) {
/* ether_type not known, print raw packet */
if (!eflag)
sll_print(sllp, length + SLL_HDR_LEN);
if (!suppress_default_print)
default_print(p, caplen);
}
}
return (SLL_HDR_LEN);
}
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