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.
  */

 /* \summary: Linux cooked sockets capture printer */

 #ifdef HAVE_CONFIG_H
 #include <config.h>
 #endif

 #ifdef HAVE_NET_IF_H
 /*
  * Include diag-control.h before <net/if.h>, which too defines a macro
  * named ND_UNREACHABLE.
  */
 #include "diag-control.h"
 #include <net/if.h>
 #endif

 #include "netdissect-stdinc.h"

 #define ND_LONGJMP_FROM_TCHECK
 #include "netdissect.h"
 #include "addrtoname.h"
 #include "ethertype.h"
 #include "extract.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
  * "tcpdump-workers@lists.tcpdump.org" 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 {
 	nd_uint16_t	sll_pkttype;	/* packet type */
 	nd_uint16_t	sll_hatype;	/* link-layer address type */
 	nd_uint16_t	sll_halen;	/* link-layer address length */
 	nd_byte		sll_addr[SLL_ADDRLEN];	/* link-layer address */
 	nd_uint16_t	sll_protocol;	/* protocol */
 };

 /*
  * A DLT_LINUX_SLL2 fake link-layer header.
  */
 #define SLL2_HDR_LEN	20		/* total header length */

 struct sll2_header {
 	nd_uint16_t	sll2_protocol;		/* protocol */
 	nd_uint16_t	sll2_reserved_mbz;	/* reserved - must be zero */
 	nd_uint32_t	sll2_if_index;		/* 1-based interface index */
 	nd_uint16_t	sll2_hatype;		/* link-layer address type */
 	nd_uint8_t	sll2_pkttype;		/* packet type */
 	nd_uint8_t	sll2_halen;		/* link-layer address length */
 	nd_byte		sll2_addr[SLL_ADDRLEN];	/* link-layer address */
 };

 /*
  * 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 void
 sll_print(netdissect_options *ndo, const struct sll_header *sllp, u_int length)
 {
 	u_short ether_type;

 	ndo->ndo_protocol = "sll";
         ND_PRINT("%3s ",
 		 tok2str(sll_pkttype_values,"?",GET_BE_U_2(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 (GET_BE_U_2(sllp->sll_halen) == MAC_ADDR_LEN)
 		ND_PRINT("%s ", GET_ETHERADDR_STRING(sllp->sll_addr));

 	if (!ndo->ndo_qflag) {
 		ether_type = GET_BE_U_2(sllp->sll_protocol);

 		if (ether_type <= MAX_ETHERNET_LENGTH_VAL) {
 			/*
 			 * Not an Ethernet type; what type is it?
 			 */
 			switch (ether_type) {

 			case LINUX_SLL_P_802_3:
 				/*
 				 * Ethernet_802.3 IPX frame.
 				 */
 				ND_PRINT("802.3");
 				break;

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

 			default:
 				/*
 				 * What is it?
 				 */
 				ND_PRINT("ethertype Unknown (0x%04x)",
 				    ether_type);
 				break;
 			}
 		} else {
 			ND_PRINT("ethertype %s (0x%04x)",
 			    tok2str(ethertype_values, "Unknown", ether_type),
 			    ether_type);
 		}
 		ND_PRINT(", 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.
  */
 void
 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;
 	const struct sll_header *sllp;
 	u_short hatype;
 	u_short ether_type;
 	int llc_hdrlen;
 	u_int hdrlen;

 	ndo->ndo_protocol = "sll";
 	ND_TCHECK_LEN(p, SLL_HDR_LEN);

 	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;
 	hdrlen = SLL_HDR_LEN;

 	hatype = GET_BE_U_2(sllp->sll_hatype);
 	switch (hatype) {

 	case 803:
 		/*
 		 * This is an packet with a radiotap header;
 		 * just dissect the payload as such.
 		 */
 		ndo->ndo_ll_hdr_len += SLL_HDR_LEN;
 		ndo->ndo_ll_hdr_len += ieee802_11_radio_print(ndo, p, length, caplen);
 		return;
 	}
 	ether_type = GET_BE_U_2(sllp->sll_protocol);

 recurse:
 	/*
 	 * Is it (gag) an 802.3 encapsulation, or some non-Ethernet
 	 * packet type?
 	 */
 	if (ether_type <= MAX_ETHERNET_LENGTH_VAL) {
 		/*
 		 * 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.
 			 */
 			llc_hdrlen = llc_print(ndo, p, length, caplen, NULL, NULL);
 			if (llc_hdrlen < 0)
 				goto unknown;	/* unknown LLC type */
 			hdrlen += llc_hdrlen;
 			break;

 		default:
 			/*FALLTHROUGH*/

 		unknown:
 			/* packet type not known, print raw packet */
 			if (!ndo->ndo_suppress_default_print)
 				ND_DEFAULTPRINT(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) {
 			ndo->ndo_protocol = "vlan";
 			nd_print_trunc(ndo);
 			ndo->ndo_ll_hdr_len += hdrlen + caplen;
 			return;
 		}
 	        if (ndo->ndo_eflag) {
 			uint16_t tag = GET_BE_U_2(p);

 			ND_PRINT("%s, ", ieee8021q_tci_string(tag));
 		}

 		ether_type = GET_BE_U_2(p + 2);
 		if (ether_type <= MAX_ETHERNET_LENGTH_VAL)
 			ether_type = LINUX_SLL_P_802_2;
 		if (!ndo->ndo_qflag) {
 			ND_PRINT("ethertype %s, ",
 			    tok2str(ethertype_values, "Unknown", ether_type));
 		}
 		p += 4;
 		length -= 4;
 		caplen -= 4;
 		hdrlen += 4;
 		goto recurse;
 	} else {
 		if (ethertype_print(ndo, ether_type, p, length, caplen, NULL, NULL) == 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)
 				ND_DEFAULTPRINT(p, caplen);
 		}
 	}

 	ndo->ndo_ll_hdr_len += hdrlen;
 }

 static void
 sll2_print(netdissect_options *ndo, const struct sll2_header *sllp, u_int length)
 {
 	u_short ether_type;

 	ndo->ndo_protocol = "sll2";
 	ND_PRINT("ifindex %u ", GET_BE_U_4(sllp->sll2_if_index));

 	/*
 	 * XXX - check the link-layer address type value?
 	 * For now, we just assume 6 means Ethernet.
 	 * XXX - print others as strings of hex?
 	 */
 	if (GET_U_1(sllp->sll2_halen) == MAC_ADDR_LEN)
 		ND_PRINT("%s ", GET_ETHERADDR_STRING(sllp->sll2_addr));

 	if (!ndo->ndo_qflag) {
 		ether_type = GET_BE_U_2(sllp->sll2_protocol);

 		if (ether_type <= MAX_ETHERNET_LENGTH_VAL) {
 			/*
 			 * Not an Ethernet type; what type is it?
 			 */
 			switch (ether_type) {

 			case LINUX_SLL_P_802_3:
 				/*
 				 * Ethernet_802.3 IPX frame.
 				 */
 				ND_PRINT("802.3");
 				break;

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

 			default:
 				/*
 				 * What is it?
 				 */
 				ND_PRINT("ethertype Unknown (0x%04x)",
 				    ether_type);
 				break;
 			}
 		} else {
 			ND_PRINT("ethertype %s (0x%04x)",
 			    tok2str(ethertype_values, "Unknown", ether_type),
 			    ether_type);
 		}
 		ND_PRINT(", 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.
  */
 void
 sll2_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, const u_char *p)
 {
 	u_int caplen = h->caplen;
 	u_int length = h->len;
 	const struct sll2_header *sllp;
 	u_short hatype;
 	u_short ether_type;
 	int llc_hdrlen;
 	u_int hdrlen;
 #ifdef HAVE_NET_IF_H
 	uint32_t if_index;
 	char ifname[IF_NAMESIZE];
 #endif

 	ndo->ndo_protocol = "sll2";
 	ND_TCHECK_LEN(p, SLL2_HDR_LEN);

 	sllp = (const struct sll2_header *)p;
 #ifdef HAVE_NET_IF_H
 	if_index = GET_BE_U_4(sllp->sll2_if_index);
 	if (!if_indextoname(if_index, ifname))
 		strncpy(ifname, "?", 2);
 	ND_PRINT("%-5s ", ifname);
 #endif

 	ND_PRINT("%-3s ",
 		 tok2str(sll_pkttype_values, "?", GET_U_1(sllp->sll2_pkttype)));

 	if (ndo->ndo_eflag)
 		sll2_print(ndo, sllp, length);

 	/*
 	 * Go past the cooked-mode header.
 	 */
 	length -= SLL2_HDR_LEN;
 	caplen -= SLL2_HDR_LEN;
 	p += SLL2_HDR_LEN;
 	hdrlen = SLL2_HDR_LEN;

 	hatype = GET_BE_U_2(sllp->sll2_hatype);
 	switch (hatype) {

 	case 803:
 		/*
 		 * This is an packet with a radiotap header;
 		 * just dissect the payload as such.
 		 */
 		ndo->ndo_ll_hdr_len += SLL2_HDR_LEN;
 		ndo->ndo_ll_hdr_len += ieee802_11_radio_print(ndo, p, length, caplen);
 		return;
 	}
 	ether_type = GET_BE_U_2(sllp->sll2_protocol);

 recurse:
 	/*
 	 * Is it (gag) an 802.3 encapsulation, or some non-Ethernet
 	 * packet type?
 	 */
 	if (ether_type <= MAX_ETHERNET_LENGTH_VAL) {
 		/*
 		 * 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.
 			 */
 			llc_hdrlen = llc_print(ndo, p, length, caplen, NULL, NULL);
 			if (llc_hdrlen < 0)
 				goto unknown;	/* unknown LLC type */
 			hdrlen += llc_hdrlen;
 			break;

 		default:
 			/*FALLTHROUGH*/

 		unknown:
 			/* packet type not known, print raw packet */
 			if (!ndo->ndo_suppress_default_print)
 				ND_DEFAULTPRINT(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) {
 			ndo->ndo_protocol = "vlan";
 			nd_print_trunc(ndo);
 			ndo->ndo_ll_hdr_len += hdrlen + caplen;
 			return;
 		}
 	        if (ndo->ndo_eflag) {
 			uint16_t tag = GET_BE_U_2(p);

 			ND_PRINT("%s, ", ieee8021q_tci_string(tag));
 		}

 		ether_type = GET_BE_U_2(p + 2);
 		if (ether_type <= MAX_ETHERNET_LENGTH_VAL)
 			ether_type = LINUX_SLL_P_802_2;
 		if (!ndo->ndo_qflag) {
 			ND_PRINT("ethertype %s, ",
 			    tok2str(ethertype_values, "Unknown", ether_type));
 		}
 		p += 4;
 		length -= 4;
 		caplen -= 4;
 		hdrlen += 4;
 		goto recurse;
 	} else {
 		if (ethertype_print(ndo, ether_type, p, length, caplen, NULL, NULL) == 0) {
 			/* ether_type not known, print raw packet */
 			if (!ndo->ndo_eflag)
 				sll2_print(ndo, sllp, length + SLL2_HDR_LEN);
 			if (!ndo->ndo_suppress_default_print)
 				ND_DEFAULTPRINT(p, caplen);
 		}
 	}

 	ndo->ndo_ll_hdr_len += hdrlen;
 }
	/*
	* 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.
	*/

	/* \summary: Linux cooked sockets capture printer */

	#ifdef HAVE_CONFIG_H
	#include <config.h>
	#endif

	#ifdef HAVE_NET_IF_H
	/*
	* Include diag-control.h before <net/if.h>, which too defines a macro
	* named ND_UNREACHABLE.
	*/
	#include "diag-control.h"
	#include <net/if.h>
	#endif

	#include "netdissect-stdinc.h"

	#define ND_LONGJMP_FROM_TCHECK
	#include "netdissect.h"
	#include "addrtoname.h"
	#include "ethertype.h"
	#include "extract.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
	* "tcpdump-workers@lists.tcpdump.org" 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 {
	nd_uint16_t sll_pkttype; /* packet type */
	nd_uint16_t sll_hatype; /* link-layer address type */
	nd_uint16_t sll_halen; /* link-layer address length */
	nd_byte sll_addr[SLL_ADDRLEN]; /* link-layer address */
	nd_uint16_t sll_protocol; /* protocol */
	};

	/*
	* A DLT_LINUX_SLL2 fake link-layer header.
	*/
	#define SLL2_HDR_LEN 20 /* total header length */

	struct sll2_header {
	nd_uint16_t sll2_protocol; /* protocol */
	nd_uint16_t sll2_reserved_mbz; /* reserved - must be zero */
	nd_uint32_t sll2_if_index; /* 1-based interface index */
	nd_uint16_t sll2_hatype; /* link-layer address type */
	nd_uint8_t sll2_pkttype; /* packet type */
	nd_uint8_t sll2_halen; /* link-layer address length */
	nd_byte sll2_addr[SLL_ADDRLEN]; /* link-layer address */
	};

	/*
	* 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 void
	sll_print(netdissect_options ndo, const struct sll_header sllp, u_int length)
	{
	u_short ether_type;

	ndo->ndo_protocol = "sll";
	ND_PRINT("%3s ",
	tok2str(sll_pkttype_values,"?",GET_BE_U_2(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 (GET_BE_U_2(sllp->sll_halen) == MAC_ADDR_LEN)
	ND_PRINT("%s ", GET_ETHERADDR_STRING(sllp->sll_addr));

	if (!ndo->ndo_qflag) {
	ether_type = GET_BE_U_2(sllp->sll_protocol);

	if (ether_type <= MAX_ETHERNET_LENGTH_VAL) {
	/*
	* Not an Ethernet type; what type is it?
	*/
	switch (ether_type) {

	case LINUX_SLL_P_802_3:
	/*
	* Ethernet_802.3 IPX frame.
	*/
	ND_PRINT("802.3");
	break;

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

	default:
	/*
	* What is it?
	*/
	ND_PRINT("ethertype Unknown (0x%04x)",
	ether_type);
	break;
	}
	} else {
	ND_PRINT("ethertype %s (0x%04x)",
	tok2str(ethertype_values, "Unknown", ether_type),
	ether_type);
	}
	ND_PRINT(", 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.
	*/
	void
	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;
	const struct sll_header *sllp;
	u_short hatype;
	u_short ether_type;
	int llc_hdrlen;
	u_int hdrlen;

	ndo->ndo_protocol = "sll";
	ND_TCHECK_LEN(p, SLL_HDR_LEN);

	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;
	hdrlen = SLL_HDR_LEN;

	hatype = GET_BE_U_2(sllp->sll_hatype);
	switch (hatype) {

	case 803:
	/*
	* This is an packet with a radiotap header;
	* just dissect the payload as such.
	*/
	ndo->ndo_ll_hdr_len += SLL_HDR_LEN;
	ndo->ndo_ll_hdr_len += ieee802_11_radio_print(ndo, p, length, caplen);
	return;
	}
	ether_type = GET_BE_U_2(sllp->sll_protocol);

	recurse:
	/*
	* Is it (gag) an 802.3 encapsulation, or some non-Ethernet
	* packet type?
	*/
	if (ether_type <= MAX_ETHERNET_LENGTH_VAL) {
	/*
	* 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.
	*/
	llc_hdrlen = llc_print(ndo, p, length, caplen, NULL, NULL);
	if (llc_hdrlen < 0)
	goto unknown; /* unknown LLC type */
	hdrlen += llc_hdrlen;
	break;

	default:
	/FALLTHROUGH/

	unknown:
	/* packet type not known, print raw packet */
	if (!ndo->ndo_suppress_default_print)
	ND_DEFAULTPRINT(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) {
	ndo->ndo_protocol = "vlan";
	nd_print_trunc(ndo);
	ndo->ndo_ll_hdr_len += hdrlen + caplen;
	return;
	}
	if (ndo->ndo_eflag) {
	uint16_t tag = GET_BE_U_2(p);

	ND_PRINT("%s, ", ieee8021q_tci_string(tag));
	}

	ether_type = GET_BE_U_2(p + 2);
	if (ether_type <= MAX_ETHERNET_LENGTH_VAL)
	ether_type = LINUX_SLL_P_802_2;
	if (!ndo->ndo_qflag) {
	ND_PRINT("ethertype %s, ",
	tok2str(ethertype_values, "Unknown", ether_type));
	}
	p += 4;
	length -= 4;
	caplen -= 4;
	hdrlen += 4;
	goto recurse;
	} else {
	if (ethertype_print(ndo, ether_type, p, length, caplen, NULL, NULL) == 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)
	ND_DEFAULTPRINT(p, caplen);
	}
	}

	ndo->ndo_ll_hdr_len += hdrlen;
	}

	static void
	sll2_print(netdissect_options ndo, const struct sll2_header sllp, u_int length)
	{
	u_short ether_type;

	ndo->ndo_protocol = "sll2";
	ND_PRINT("ifindex %u ", GET_BE_U_4(sllp->sll2_if_index));

	/*
	* XXX - check the link-layer address type value?
	* For now, we just assume 6 means Ethernet.
	* XXX - print others as strings of hex?
	*/
	if (GET_U_1(sllp->sll2_halen) == MAC_ADDR_LEN)
	ND_PRINT("%s ", GET_ETHERADDR_STRING(sllp->sll2_addr));

	if (!ndo->ndo_qflag) {
	ether_type = GET_BE_U_2(sllp->sll2_protocol);

	if (ether_type <= MAX_ETHERNET_LENGTH_VAL) {
	/*
	* Not an Ethernet type; what type is it?
	*/
	switch (ether_type) {

	case LINUX_SLL_P_802_3:
	/*
	* Ethernet_802.3 IPX frame.
	*/
	ND_PRINT("802.3");
	break;

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

	default:
	/*
	* What is it?
	*/
	ND_PRINT("ethertype Unknown (0x%04x)",
	ether_type);
	break;
	}
	} else {
	ND_PRINT("ethertype %s (0x%04x)",
	tok2str(ethertype_values, "Unknown", ether_type),
	ether_type);
	}
	ND_PRINT(", 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.
	*/
	void
	sll2_if_print(netdissect_options ndo, const struct pcap_pkthdr h, const u_char *p)
	{
	u_int caplen = h->caplen;
	u_int length = h->len;
	const struct sll2_header *sllp;
	u_short hatype;
	u_short ether_type;
	int llc_hdrlen;
	u_int hdrlen;
	#ifdef HAVE_NET_IF_H
	uint32_t if_index;
	char ifname[IF_NAMESIZE];
	#endif

	ndo->ndo_protocol = "sll2";
	ND_TCHECK_LEN(p, SLL2_HDR_LEN);

	sllp = (const struct sll2_header *)p;
	#ifdef HAVE_NET_IF_H
	if_index = GET_BE_U_4(sllp->sll2_if_index);
	if (!if_indextoname(if_index, ifname))
	strncpy(ifname, "?", 2);
	ND_PRINT("%-5s ", ifname);
	#endif

	ND_PRINT("%-3s ",
	tok2str(sll_pkttype_values, "?", GET_U_1(sllp->sll2_pkttype)));

	if (ndo->ndo_eflag)
	sll2_print(ndo, sllp, length);

	/*
	* Go past the cooked-mode header.
	*/
	length -= SLL2_HDR_LEN;
	caplen -= SLL2_HDR_LEN;
	p += SLL2_HDR_LEN;
	hdrlen = SLL2_HDR_LEN;

	hatype = GET_BE_U_2(sllp->sll2_hatype);
	switch (hatype) {

	case 803:
	/*
	* This is an packet with a radiotap header;
	* just dissect the payload as such.
	*/
	ndo->ndo_ll_hdr_len += SLL2_HDR_LEN;
	ndo->ndo_ll_hdr_len += ieee802_11_radio_print(ndo, p, length, caplen);
	return;
	}
	ether_type = GET_BE_U_2(sllp->sll2_protocol);

	recurse:
	/*
	* Is it (gag) an 802.3 encapsulation, or some non-Ethernet
	* packet type?
	*/
	if (ether_type <= MAX_ETHERNET_LENGTH_VAL) {
	/*
	* 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.
	*/
	llc_hdrlen = llc_print(ndo, p, length, caplen, NULL, NULL);
	if (llc_hdrlen < 0)
	goto unknown; /* unknown LLC type */
	hdrlen += llc_hdrlen;
	break;

	default:
	/FALLTHROUGH/

	unknown:
	/* packet type not known, print raw packet */
	if (!ndo->ndo_suppress_default_print)
	ND_DEFAULTPRINT(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) {
	ndo->ndo_protocol = "vlan";
	nd_print_trunc(ndo);
	ndo->ndo_ll_hdr_len += hdrlen + caplen;
	return;
	}
	if (ndo->ndo_eflag) {
	uint16_t tag = GET_BE_U_2(p);

	ND_PRINT("%s, ", ieee8021q_tci_string(tag));
	}

	ether_type = GET_BE_U_2(p + 2);
	if (ether_type <= MAX_ETHERNET_LENGTH_VAL)
	ether_type = LINUX_SLL_P_802_2;
	if (!ndo->ndo_qflag) {
	ND_PRINT("ethertype %s, ",
	tok2str(ethertype_values, "Unknown", ether_type));
	}
	p += 4;
	length -= 4;
	caplen -= 4;
	hdrlen += 4;
	goto recurse;
	} else {
	if (ethertype_print(ndo, ether_type, p, length, caplen, NULL, NULL) == 0) {
	/* ether_type not known, print raw packet */
	if (!ndo->ndo_eflag)
	sll2_print(ndo, sllp, length + SLL2_HDR_LEN);
	if (!ndo->ndo_suppress_default_print)
	ND_DEFAULTPRINT(p, caplen);
	}
	}

	ndo->ndo_ll_hdr_len += hdrlen;
	}