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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[] =
"@(#) $Header: /tcpdump/master/tcpdump/print-sll.c,v 1.9 2002-09-05 21:25:48 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 "ether.h"
#include "sll.h"
static inline void
sll_print(register const struct sll_header *sllp, u_int length)
{
u_short halen;
switch (ntohs(sllp->sll_pkttype)) {
case LINUX_SLL_HOST:
(void)printf("< ");
break;
case LINUX_SLL_BROADCAST:
(void)printf("B ");
break;
case LINUX_SLL_MULTICAST:
(void)printf("M ");
break;
case LINUX_SLL_OTHERHOST:
(void)printf("P ");
break;
case LINUX_SLL_OUTGOING:
(void)printf("> ");
break;
default:
(void)printf("? ");
break;
}
/*
* XXX - check the link-layer address type value?
* For now, we just assume 6 means Ethernet.
* XXX - print others as strings of hex?
*/
halen = ntohs(sllp->sll_halen);
if (halen == 6)
(void)printf("%s ", etheraddr_string(sllp->sll_addr));
if (!qflag)
(void)printf("%s ", etherproto_string(sllp->sll_protocol));
(void)printf("%d: ", 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->length' is the length of the packet off the wire, and 'h->caplen'
* is the number of bytes actually captured.
*/
void
sll_if_print(u_char *user _U_, 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 pkttype;
struct ether_header ehdr;
u_short ether_type;
u_short extracted_ethertype;
++infodelay;
ts_print(&h->ts);
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]");
goto out;
}
sllp = (const struct sll_header *)p;
/*
* Fake up an Ethernet header for the benefit of printers that
* insist on "packetp" pointing to an Ethernet header.
*/
pkttype = ntohs(sllp->sll_pkttype);
/* The source address is in the packet header */
memcpy(ehdr.ether_shost, sllp->sll_addr, ETHER_ADDR_LEN);
if (pkttype != LINUX_SLL_OUTGOING) {
/*
* We received this packet.
*
* We don't know the destination address, so
* we fake it - all 0's except that the
* bottommost bit of the bottommost octet
* is set for a unicast packet, all 0's except
* that the bottommost bit of the uppermost
* octet is set for a multicast packet, all
* 1's for a broadcast packet.
*/
if (pkttype == LINUX_SLL_BROADCAST)
memset(ehdr.ether_dhost, 0xFF, ETHER_ADDR_LEN);
else {
memset(ehdr.ether_dhost, 0, ETHER_ADDR_LEN);
if (pkttype == LINUX_SLL_MULTICAST)
ehdr.ether_dhost[0] = 1;
else
ehdr.ether_dhost[ETHER_ADDR_LEN-1] = 1;
}
} else {
/*
* We sent this packet; we don't know whether it's
* broadcast, multicast, or unicast, so just make
* the destination address all 0's.
*/
memset(ehdr.ether_dhost, 0, ETHER_ADDR_LEN);
}
if (eflag)
sll_print(sllp, length);
/*
* 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.
*/
snapend = p + caplen;
/*
* Actually, the only printers that use packetp are print-arp.c
* and print-bootp.c, and they assume that packetp points to an
* Ethernet header. The right thing to do is to fix them to know
* which link type is in use when they excavate. XXX
*/
packetp = (u_char *)&ehdr;
length -= SLL_HDR_LEN;
caplen -= SLL_HDR_LEN;
p += SLL_HDR_LEN;
ether_type = ntohs(sllp->sll_protocol);
/*
* Is it (gag) an 802.3 encapsulation, or some non-Ethernet
* packet type?
*/
extracted_ethertype = 0;
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, ESRC(&ehdr),
EDST(&ehdr), &extracted_ethertype) == 0)
goto unknown; /* unknown LLC type */
break;
default:
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 (!xflag && !qflag)
default_print(p, caplen);
break;
}
} else if (ether_encap_print(ether_type, p, length, caplen,
&extracted_ethertype) == 0) {
/* ether_type not known, print raw packet */
if (!eflag)
sll_print(sllp, length + SLL_HDR_LEN);
if (!xflag && !qflag)
default_print(p, caplen);
}
if (xflag)
default_print(p, caplen);
out:
putchar('\n');
--infodelay;
if (infoprint)
info(0);
}
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