312 lines
9.1 KiB
C
312 lines
9.1 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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#define NETDISSECT_REWORKED
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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 <tcpdump-stdinc.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 "extract.h"
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#include "ether.h"
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/*
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* For captures on Linux cooked sockets, we construct a fake header
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* that includes:
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*
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* a 2-byte "packet type" which is one of:
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*
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* LINUX_SLL_HOST packet was sent to us
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* LINUX_SLL_BROADCAST packet was broadcast
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* LINUX_SLL_MULTICAST packet was multicast
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* LINUX_SLL_OTHERHOST packet was sent to somebody else
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* LINUX_SLL_OUTGOING packet was sent *by* us;
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*
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* a 2-byte Ethernet protocol field;
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*
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* a 2-byte link-layer type;
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*
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* a 2-byte link-layer address length;
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*
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* an 8-byte source link-layer address, whose actual length is
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* specified by the previous value.
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*
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* All fields except for the link-layer address are in network byte order.
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*
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* DO NOT change the layout of this structure, or change any of the
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* LINUX_SLL_ values below. If you must change the link-layer header
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* for a "cooked" Linux capture, introduce a new DLT_ type (ask
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* "tcpdump-workers@lists.tcpdump.org" for one, so that you don't give it
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* a value that collides with a value already being used), and use the
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* new header in captures of that type, so that programs that can
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* handle DLT_LINUX_SLL captures will continue to handle them correctly
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* without any change, and so that capture files with different headers
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* can be told apart and programs that read them can dissect the
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* packets in them.
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*
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* This structure, and the #defines below, must be the same in the
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* libpcap and tcpdump versions of "sll.h".
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*/
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/*
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* A DLT_LINUX_SLL fake link-layer header.
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*/
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#define SLL_HDR_LEN 16 /* total header length */
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#define SLL_ADDRLEN 8 /* length of address field */
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struct sll_header {
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uint16_t sll_pkttype; /* packet type */
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uint16_t sll_hatype; /* link-layer address type */
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uint16_t sll_halen; /* link-layer address length */
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uint8_t sll_addr[SLL_ADDRLEN]; /* link-layer address */
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uint16_t sll_protocol; /* protocol */
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};
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/*
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* The LINUX_SLL_ values for "sll_pkttype"; these correspond to the
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* PACKET_ values on Linux, but are defined here so that they're
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* available even on systems other than Linux, and so that they
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* don't change even if the PACKET_ values change.
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*/
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#define LINUX_SLL_HOST 0
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#define LINUX_SLL_BROADCAST 1
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#define LINUX_SLL_MULTICAST 2
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#define LINUX_SLL_OTHERHOST 3
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#define LINUX_SLL_OUTGOING 4
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/*
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* The LINUX_SLL_ values for "sll_protocol"; these correspond to the
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* ETH_P_ values on Linux, but are defined here so that they're
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* available even on systems other than Linux. We assume, for now,
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* that the ETH_P_ values won't change in Linux; if they do, then:
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*
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* if we don't translate them in "pcap-linux.c", capture files
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* won't necessarily be readable if captured on a system that
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* defines ETH_P_ values that don't match these values;
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*
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* if we do translate them in "pcap-linux.c", that makes life
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* unpleasant for the BPF code generator, as the values you test
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* for in the kernel aren't the values that you test for when
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* reading a capture file, so the fixup code run on BPF programs
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* handed to the kernel ends up having to do more work.
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*
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* Add other values here as necessary, for handling packet types that
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* might show up on non-Ethernet, non-802.x networks. (Not all the ones
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* in the Linux "if_ether.h" will, I suspect, actually show up in
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* captures.)
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*/
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#define LINUX_SLL_P_802_3 0x0001 /* Novell 802.3 frames without 802.2 LLC header */
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#define LINUX_SLL_P_802_2 0x0004 /* 802.2 frames (not D/I/X Ethernet) */
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static const struct tok sll_pkttype_values[] = {
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{ LINUX_SLL_HOST, "In" },
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{ LINUX_SLL_BROADCAST, "B" },
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{ LINUX_SLL_MULTICAST, "M" },
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{ LINUX_SLL_OTHERHOST, "P" },
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{ LINUX_SLL_OUTGOING, "Out" },
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{ 0, NULL}
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};
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static inline void
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sll_print(netdissect_options *ndo, register const struct sll_header *sllp, u_int length)
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{
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u_short ether_type;
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ND_PRINT((ndo, "%3s ",tok2str(sll_pkttype_values,"?",EXTRACT_16BITS(&sllp->sll_pkttype))));
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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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if (EXTRACT_16BITS(&sllp->sll_halen) == 6)
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ND_PRINT((ndo, "%s ", etheraddr_string(ndo, sllp->sll_addr)));
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if (!ndo->ndo_qflag) {
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ether_type = EXTRACT_16BITS(&sllp->sll_protocol);
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if (ether_type <= ETHERMTU) {
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/*
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* Not an Ethernet type; what type is it?
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*/
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switch (ether_type) {
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case LINUX_SLL_P_802_3:
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/*
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* Ethernet_802.3 IPX frame.
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*/
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ND_PRINT((ndo, "802.3"));
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break;
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case LINUX_SLL_P_802_2:
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/*
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* 802.2.
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*/
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ND_PRINT((ndo, "802.2"));
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break;
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default:
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/*
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* What is it?
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*/
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ND_PRINT((ndo, "ethertype Unknown (0x%04x)",
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ether_type));
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break;
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}
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} else {
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ND_PRINT((ndo, "ethertype %s (0x%04x)",
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tok2str(ethertype_values, "Unknown", ether_type),
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ether_type));
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}
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ND_PRINT((ndo, ", length %u: ", length));
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}
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}
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/*
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* This is the top level routine of the printer. 'p' points to the
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* Linux "cooked capture" header of the packet, 'h->ts' is the timestamp,
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* 'h->len' 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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u_int
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sll_if_print(netdissect_options *ndo, 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 ether_type;
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u_short extracted_ethertype;
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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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ND_PRINT((ndo, "[|sll]"));
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return (caplen);
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}
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sllp = (const struct sll_header *)p;
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if (ndo->ndo_eflag)
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sll_print(ndo, sllp, length);
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/*
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* Go past the cooked-mode header.
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*/
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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 = EXTRACT_16BITS(&sllp->sll_protocol);
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recurse:
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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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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_3:
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/*
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* Ethernet_802.3 IPX frame.
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*/
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ipx_print(ndo, p, length);
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break;
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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(ndo, p, length, caplen, NULL, NULL,
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&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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extracted_ethertype = 0;
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/*FALLTHROUGH*/
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unknown:
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/* ether_type not known, print raw packet */
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if (!ndo->ndo_eflag)
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sll_print(ndo, sllp, length + SLL_HDR_LEN);
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if (extracted_ethertype) {
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ND_PRINT((ndo, "(LLC %s) ",
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etherproto_string(htons(extracted_ethertype))));
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}
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if (!ndo->ndo_suppress_default_print)
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ND_DEFAULTPRINT(p, caplen);
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break;
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}
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} else if (ether_type == ETHERTYPE_8021Q) {
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/*
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* Print VLAN information, and then go back and process
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* the enclosed type field.
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*/
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if (caplen < 4 || length < 4) {
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ND_PRINT((ndo, "[|vlan]"));
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return (SLL_HDR_LEN);
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}
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if (ndo->ndo_eflag) {
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uint16_t tag = EXTRACT_16BITS(p);
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ND_PRINT((ndo, "vlan %u, p %u%s, ",
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tag & 0xfff,
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tag >> 13,
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(tag & 0x1000) ? ", CFI" : ""));
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}
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ether_type = EXTRACT_16BITS(p + 2);
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if (ether_type <= ETHERMTU)
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ether_type = LINUX_SLL_P_802_2;
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if (!ndo->ndo_qflag) {
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ND_PRINT((ndo, "ethertype %s, ",
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tok2str(ethertype_values, "Unknown", ether_type)));
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}
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p += 4;
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length -= 4;
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caplen -= 4;
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goto recurse;
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} else {
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if (ethertype_print(ndo, ether_type, p, length, caplen) == 0) {
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/* ether_type not known, print raw packet */
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if (!ndo->ndo_eflag)
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sll_print(ndo, sllp, length + SLL_HDR_LEN);
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if (!ndo->ndo_suppress_default_print)
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ND_DEFAULTPRINT(p, caplen);
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}
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}
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return (SLL_HDR_LEN);
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}
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