239 lines
6.2 KiB
C
239 lines
6.2 KiB
C
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/*
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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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#ifndef lint
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static const char rcsid[] =
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"@(#) $Header: /tcpdump/master/tcpdump/print-sll.c,v 1.3 2000/12/23 20:49:34 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 <string.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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#include "sll.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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sll_print(register const struct sll_header *sllp, u_int length)
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{
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u_short halen;
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switch (ntohs(sllp->sll_pkttype)) {
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case LINUX_SLL_HOST:
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(void)printf("< ");
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break;
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case LINUX_SLL_BROADCAST:
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(void)printf("B ");
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break;
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case LINUX_SLL_MULTICAST:
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(void)printf("M ");
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break;
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case LINUX_SLL_OTHERHOST:
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(void)printf("P ");
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break;
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case LINUX_SLL_OUTGOING:
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(void)printf("> ");
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break;
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default:
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(void)printf("? ");
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break;
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}
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/*
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* XXX - check the link-layer address type value?
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* For now, we just assume 6 means Ethernet.
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* XXX - print others as strings of hex?
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*/
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halen = ntohs(sllp->sll_halen);
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if (halen == 6)
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(void)printf("%s ", etheraddr_string(sllp->sll_addr));
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if (!qflag)
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(void)printf("%s ", etherproto_string(sllp->sll_protocol));
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(void)printf("%d: ", 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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sll_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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register const struct sll_header *sllp;
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u_short pkttype;
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struct ether_header ehdr;
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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 < SLL_HDR_LEN) {
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/*
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* XXX - this "can't happen" because "pcap-linux.c" always
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* adds this many bytes of header to every packet in a
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* cooked socket capture.
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*/
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printf("[|sll]");
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goto out;
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}
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sllp = (const struct sll_header *)p;
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/*
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* Fake up an Ethernet header for the benefit of printers that
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* insist on "packetp" pointing to an Ethernet header.
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*/
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pkttype = ntohs(sllp->sll_pkttype);
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/* The source address is in the packet header */
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memcpy(ehdr.ether_shost, sllp->sll_addr, ETHER_ADDR_LEN);
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if (pkttype != LINUX_SLL_OUTGOING) {
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/*
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* We received this packet.
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*
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* We don't know the destination address, so
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* we fake it - all 0's except that the
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* bottommost bit of the bottommost octet
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* is set for a unicast packet, all 0's except
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* that the bottommost bit of the uppermost
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* octet is set for a multicast packet, all
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* 1's for a broadcast packet.
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*/
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if (pkttype == LINUX_SLL_BROADCAST)
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memset(ehdr.ether_dhost, 0xFF, ETHER_ADDR_LEN);
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else {
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memset(ehdr.ether_dhost, 0, ETHER_ADDR_LEN);
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if (pkttype == LINUX_SLL_MULTICAST)
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ehdr.ether_dhost[0] = 1;
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else
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ehdr.ether_dhost[ETHER_ADDR_LEN-1] = 1;
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}
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} else {
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/*
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* We sent this packet; we don't know whether it's
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* broadcast, multicast, or unicast, so just make
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* the destination address all 0's.
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*/
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memset(ehdr.ether_dhost, 0, ETHER_ADDR_LEN);
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}
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if (eflag)
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sll_print(sllp, 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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snapend = p + caplen;
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/*
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* Actually, the only printers that use packetp are print-arp.c
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* and print-bootp.c, and they assume that packetp points to an
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* Ethernet header. The right thing to do is to fix them to know
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* which link type is in use when they excavate. XXX
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*/
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packetp = (u_char *)&ehdr;
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length -= SLL_HDR_LEN;
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caplen -= SLL_HDR_LEN;
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p += SLL_HDR_LEN;
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ether_type = ntohs(sllp->sll_protocol);
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/*
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* Is it (gag) an 802.3 encapsulation, or some non-Ethernet
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* packet type?
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*/
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extracted_ethertype = 0;
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if (ether_type <= ETHERMTU) {
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/*
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* Yes - what type is it?
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*/
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switch (ether_type) {
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case LINUX_SLL_P_802_2:
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/*
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* 802.2.
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* Try to print the LLC-layer header & higher layers.
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*/
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if (llc_print(p, length, caplen, ESRC(&ehdr),
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EDST(&ehdr), &extracted_ethertype) == 0)
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goto unknown; /* unknown LLC type */
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break;
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default:
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unknown:
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/* ether_type not known, print raw packet */
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if (!eflag)
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sll_print(sllp, length + SLL_HDR_LEN);
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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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break;
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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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sll_print(sllp, length + SLL_HDR_LEN);
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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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