print-sll.c - platform/external/tcpdump - Git at Google

 /*
  * 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.
  */

 #define NETDISSECT_REWORKED
 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #endif

 #include <tcpdump-stdinc.h>

 #include "interface.h"
 #include "addrtoname.h"
 #include "ethertype.h"
 #include "extract.h"

 #include "ether.h"

 /*
  * For captures on Linux cooked sockets, we construct a fake header
  * that includes:
  *
  *	a 2-byte "packet type" which is one of:
  *
  *		LINUX_SLL_HOST		packet was sent to us
  *		LINUX_SLL_BROADCAST	packet was broadcast
  *		LINUX_SLL_MULTICAST	packet was multicast
  *		LINUX_SLL_OTHERHOST	packet was sent to somebody else
  *		LINUX_SLL_OUTGOING	packet was sent *by* us;
  *
  *	a 2-byte Ethernet protocol field;
  *
  *	a 2-byte link-layer type;
  *
  *	a 2-byte link-layer address length;
  *
  *	an 8-byte source link-layer address, whose actual length is
  *	specified by the previous value.
  *
  * All fields except for the link-layer address are in network byte order.
  *
  * DO NOT change the layout of this structure, or change any of the
  * LINUX_SLL_ values below.  If you must change the link-layer header
  * for a "cooked" Linux capture, introduce a new DLT_ type (ask
  * "[email protected]" for one, so that you don't give it
  * a value that collides with a value already being used), and use the
  * new header in captures of that type, so that programs that can
  * handle DLT_LINUX_SLL captures will continue to handle them correctly
  * without any change, and so that capture files with different headers
  * can be told apart and programs that read them can dissect the
  * packets in them.
  *
  * This structure, and the #defines below, must be the same in the
  * libpcap and tcpdump versions of "sll.h".
  */

 /*
  * A DLT_LINUX_SLL fake link-layer header.
  */
 #define SLL_HDR_LEN	16		/* total header length */
 #define SLL_ADDRLEN	8		/* length of address field */

 struct sll_header {
 	u_int16_t	sll_pkttype;	/* packet type */
 	u_int16_t	sll_hatype;	/* link-layer address type */
 	u_int16_t	sll_halen;	/* link-layer address length */
 	u_int8_t	sll_addr[SLL_ADDRLEN];	/* link-layer address */
 	u_int16_t	sll_protocol;	/* protocol */
 };

 /*
  * The LINUX_SLL_ values for "sll_pkttype"; these correspond to the
  * PACKET_ values on Linux, but are defined here so that they're
  * available even on systems other than Linux, and so that they
  * don't change even if the PACKET_ values change.
  */
 #define LINUX_SLL_HOST		0
 #define LINUX_SLL_BROADCAST	1
 #define LINUX_SLL_MULTICAST	2
 #define LINUX_SLL_OTHERHOST	3
 #define LINUX_SLL_OUTGOING	4

 /*
  * The LINUX_SLL_ values for "sll_protocol"; these correspond to the
  * ETH_P_ values on Linux, but are defined here so that they're
  * available even on systems other than Linux.  We assume, for now,
  * that the ETH_P_ values won't change in Linux; if they do, then:
  *
  *	if we don't translate them in "pcap-linux.c", capture files
  *	won't necessarily be readable if captured on a system that
  *	defines ETH_P_ values that don't match these values;
  *
  *	if we do translate them in "pcap-linux.c", that makes life
  *	unpleasant for the BPF code generator, as the values you test
  *	for in the kernel aren't the values that you test for when
  *	reading a capture file, so the fixup code run on BPF programs
  *	handed to the kernel ends up having to do more work.
  *
  * Add other values here as necessary, for handling packet types that
  * might show up on non-Ethernet, non-802.x networks.  (Not all the ones
  * in the Linux "if_ether.h" will, I suspect, actually show up in
  * captures.)
  */
 #define LINUX_SLL_P_802_3	0x0001	/* Novell 802.3 frames without 802.2 LLC header */
 #define LINUX_SLL_P_802_2	0x0004	/* 802.2 frames (not D/I/X Ethernet) */

 static 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(netdissect_options *ndo, register const struct sll_header *sllp, u_int length)
 {
 	u_short ether_type;

         ND_PRINT((ndo, "%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)
 		ND_PRINT((ndo, "%s ", etheraddr_string(sllp->sll_addr)));

 	if (!ndo->ndo_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.
 				 */
 				ND_PRINT((ndo, "802.3"));
 				break;

 			case LINUX_SLL_P_802_2:
 				/*
 				 * 802.2.
 				 */
 				ND_PRINT((ndo, "802.2"));
 				break;

 			default:
 				/*
 				 * What is it?
 				 */
 				ND_PRINT((ndo, "ethertype Unknown (0x%04x)",
 				    ether_type));
 				break;
 			}
 		} else {
 			ND_PRINT((ndo, "ethertype %s (0x%04x)",
 			    tok2str(ethertype_values, "Unknown", ether_type),
 			    ether_type));
 		}
 		ND_PRINT((ndo, ", 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(netdissect_options *ndo, 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.
 		 */
 		ND_PRINT((ndo, "[|sll]"));
 		return (caplen);
 	}

 	sllp = (const struct sll_header *)p;

 	if (ndo->ndo_eflag)
 		sll_print(ndo, 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(ndo, 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 (!ndo->ndo_eflag)
 				sll_print(ndo, sllp, length + SLL_HDR_LEN);
 			if (extracted_ethertype) {
 				ND_PRINT((ndo, "(LLC %s) ",
 			       etherproto_string(htons(extracted_ethertype))));
 			}
 			if (!ndo->ndo_suppress_default_print)
 				ndo->ndo_default_print(ndo, 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) {
 			ND_PRINT((ndo, "[|vlan]"));
 			return (SLL_HDR_LEN);
 		}
 	        if (ndo->ndo_eflag) {
 	        	u_int16_t tag = EXTRACT_16BITS(p);

 			ND_PRINT((ndo, "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 (!ndo->ndo_qflag) {
 			ND_PRINT((ndo, "ethertype %s, ",
 			    tok2str(ethertype_values, "Unknown", ether_type)));
 		}
 		p += 4;
 		length -= 4;
 		caplen -= 4;
 		goto recurse;
 	} else {
 		if (ethertype_print(ndo, ether_type, p, length, caplen) == 0) {
 			/* ether_type not known, print raw packet */
 			if (!ndo->ndo_eflag)
 				sll_print(ndo, sllp, length + SLL_HDR_LEN);
 			if (!ndo->ndo_suppress_default_print)
 				ndo->ndo_default_print(ndo, p, caplen);
 		}
 	}

 	return (SLL_HDR_LEN);
 }
	/*
	* 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.
	*/

	#define NETDISSECT_REWORKED
	#ifdef HAVE_CONFIG_H
	#include "config.h"
	#endif

	#include <tcpdump-stdinc.h>

	#include "interface.h"
	#include "addrtoname.h"
	#include "ethertype.h"
	#include "extract.h"

	#include "ether.h"

	/*
	* For captures on Linux cooked sockets, we construct a fake header
	* that includes:
	*
	* a 2-byte "packet type" which is one of:
	*
	* LINUX_SLL_HOST packet was sent to us
	* LINUX_SLL_BROADCAST packet was broadcast
	* LINUX_SLL_MULTICAST packet was multicast
	* LINUX_SLL_OTHERHOST packet was sent to somebody else
	* LINUX_SLL_OUTGOING packet was sent by us;
	*
	* a 2-byte Ethernet protocol field;
	*
	* a 2-byte link-layer type;
	*
	* a 2-byte link-layer address length;
	*
	* an 8-byte source link-layer address, whose actual length is
	* specified by the previous value.
	*
	* All fields except for the link-layer address are in network byte order.
	*
	* DO NOT change the layout of this structure, or change any of the
	* LINUX_SLL_ values below. If you must change the link-layer header
	* for a "cooked" Linux capture, introduce a new DLT_ type (ask
	* "[email protected]" for one, so that you don't give it
	* a value that collides with a value already being used), and use the
	* new header in captures of that type, so that programs that can
	* handle DLT_LINUX_SLL captures will continue to handle them correctly
	* without any change, and so that capture files with different headers
	* can be told apart and programs that read them can dissect the
	* packets in them.
	*
	* This structure, and the #defines below, must be the same in the
	* libpcap and tcpdump versions of "sll.h".
	*/

	/*
	* A DLT_LINUX_SLL fake link-layer header.
	*/
	#define SLL_HDR_LEN 16 /* total header length */
	#define SLL_ADDRLEN 8 /* length of address field */

	struct sll_header {
	u_int16_t sll_pkttype; /* packet type */
	u_int16_t sll_hatype; /* link-layer address type */
	u_int16_t sll_halen; /* link-layer address length */
	u_int8_t sll_addr[SLL_ADDRLEN]; /* link-layer address */
	u_int16_t sll_protocol; /* protocol */
	};

	/*
	* The LINUX_SLL_ values for "sll_pkttype"; these correspond to the
	* PACKET_ values on Linux, but are defined here so that they're
	* available even on systems other than Linux, and so that they
	* don't change even if the PACKET_ values change.
	*/
	#define LINUX_SLL_HOST 0
	#define LINUX_SLL_BROADCAST 1
	#define LINUX_SLL_MULTICAST 2
	#define LINUX_SLL_OTHERHOST 3
	#define LINUX_SLL_OUTGOING 4

	/*
	* The LINUX_SLL_ values for "sll_protocol"; these correspond to the
	* ETH_P_ values on Linux, but are defined here so that they're
	* available even on systems other than Linux. We assume, for now,
	* that the ETH_P_ values won't change in Linux; if they do, then:
	*
	* if we don't translate them in "pcap-linux.c", capture files
	* won't necessarily be readable if captured on a system that
	* defines ETH_P_ values that don't match these values;
	*
	* if we do translate them in "pcap-linux.c", that makes life
	* unpleasant for the BPF code generator, as the values you test
	* for in the kernel aren't the values that you test for when
	* reading a capture file, so the fixup code run on BPF programs
	* handed to the kernel ends up having to do more work.
	*
	* Add other values here as necessary, for handling packet types that
	* might show up on non-Ethernet, non-802.x networks. (Not all the ones
	* in the Linux "if_ether.h" will, I suspect, actually show up in
	* captures.)
	*/
	#define LINUX_SLL_P_802_3 0x0001 /* Novell 802.3 frames without 802.2 LLC header */
	#define LINUX_SLL_P_802_2 0x0004 /* 802.2 frames (not D/I/X Ethernet) */

	static 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(netdissect_options ndo, register const struct sll_header sllp, u_int length)
	{
	u_short ether_type;

	ND_PRINT((ndo, "%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)
	ND_PRINT((ndo, "%s ", etheraddr_string(sllp->sll_addr)));

	if (!ndo->ndo_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.
	*/
	ND_PRINT((ndo, "802.3"));
	break;

	case LINUX_SLL_P_802_2:
	/*
	* 802.2.
	*/
	ND_PRINT((ndo, "802.2"));
	break;

	default:
	/*
	* What is it?
	*/
	ND_PRINT((ndo, "ethertype Unknown (0x%04x)",
	ether_type));
	break;
	}
	} else {
	ND_PRINT((ndo, "ethertype %s (0x%04x)",
	tok2str(ethertype_values, "Unknown", ether_type),
	ether_type));
	}
	ND_PRINT((ndo, ", 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(netdissect_options ndo, 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.
	*/
	ND_PRINT((ndo, "[\|sll]"));
	return (caplen);
	}

	sllp = (const struct sll_header *)p;

	if (ndo->ndo_eflag)
	sll_print(ndo, 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(ndo, 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 (!ndo->ndo_eflag)
	sll_print(ndo, sllp, length + SLL_HDR_LEN);
	if (extracted_ethertype) {
	ND_PRINT((ndo, "(LLC %s) ",
	etherproto_string(htons(extracted_ethertype))));
	}
	if (!ndo->ndo_suppress_default_print)
	ndo->ndo_default_print(ndo, 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) {
	ND_PRINT((ndo, "[\|vlan]"));
	return (SLL_HDR_LEN);
	}
	if (ndo->ndo_eflag) {
	u_int16_t tag = EXTRACT_16BITS(p);

	ND_PRINT((ndo, "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 (!ndo->ndo_qflag) {
	ND_PRINT((ndo, "ethertype %s, ",
	tok2str(ethertype_values, "Unknown", ether_type)));
	}
	p += 4;
	length -= 4;
	caplen -= 4;
	goto recurse;
	} else {
	if (ethertype_print(ndo, ether_type, p, length, caplen) == 0) {
	/* ether_type not known, print raw packet */
	if (!ndo->ndo_eflag)
	sll_print(ndo, sllp, length + SLL_HDR_LEN);
	if (!ndo->ndo_suppress_default_print)
	ndo->ndo_default_print(ndo, p, caplen);
	}
	}

	return (SLL_HDR_LEN);
	}