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      1 /*
      2  * Marko Kiiskila carnil (at) cs.tut.fi
      3  *
      4  * Tampere University of Technology - Telecommunications Laboratory
      5  *
      6  * Permission to use, copy, modify and distribute this
      7  * software and its documentation is hereby granted,
      8  * provided that both the copyright notice and this
      9  * permission notice appear in all copies of the software,
     10  * derivative works or modified versions, and any portions
     11  * thereof, that both notices appear in supporting
     12  * documentation, and that the use of this software is
     13  * acknowledged in any publications resulting from using
     14  * the software.
     15  *
     16  * TUT ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
     17  * CONDITION AND DISCLAIMS ANY LIABILITY OF ANY KIND FOR
     18  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS
     19  * SOFTWARE.
     20  *
     21  */
     22 
     23 #ifndef lint
     24 static const char rcsid[] _U_ =
     25     "@(#) $Header: /tcpdump/master/tcpdump/print-lane.c,v 1.23.2.2 2005/11/13 12:12:59 guy Exp $ (LBL)";
     26 #endif
     27 
     28 #ifdef HAVE_CONFIG_H
     29 #include "config.h"
     30 #endif
     31 
     32 #include <tcpdump-stdinc.h>
     33 
     34 #include <stdio.h>
     35 #include <pcap.h>
     36 
     37 #include "interface.h"
     38 #include "addrtoname.h"
     39 #include "extract.h"
     40 #include "ether.h"
     41 #include "lane.h"
     42 
     43 static const struct tok lecop2str[] = {
     44 	{ 0x0001,	"configure request" },
     45 	{ 0x0101,	"configure response" },
     46 	{ 0x0002,	"join request" },
     47 	{ 0x0102,	"join response" },
     48 	{ 0x0003,	"ready query" },
     49 	{ 0x0103,	"ready indication" },
     50 	{ 0x0004,	"register request" },
     51 	{ 0x0104,	"register response" },
     52 	{ 0x0005,	"unregister request" },
     53 	{ 0x0105,	"unregister response" },
     54 	{ 0x0006,	"ARP request" },
     55 	{ 0x0106,	"ARP response" },
     56 	{ 0x0007,	"flush request" },
     57 	{ 0x0107,	"flush response" },
     58 	{ 0x0008,	"NARP request" },
     59 	{ 0x0009,	"topology request" },
     60 	{ 0,		NULL }
     61 };
     62 
     63 static inline void
     64 lane_hdr_print(register const u_char *bp, int length)
     65 {
     66 	register const struct lecdatahdr_8023 *ep;
     67 
     68 	ep = (const struct lecdatahdr_8023 *)bp;
     69 	if (qflag)
     70 		(void)printf("lecid:%x %s %s %d: ",
     71 			     EXTRACT_16BITS(&ep->le_header),
     72 			     etheraddr_string(ep->h_source),
     73 			     etheraddr_string(ep->h_dest),
     74 			     length);
     75 	else
     76 		(void)printf("lecid:%x %s %s %s %d: ",
     77 			     EXTRACT_16BITS(&ep->le_header),
     78 			     etheraddr_string(ep->h_source),
     79 			     etheraddr_string(ep->h_dest),
     80 			     etherproto_string(ep->h_type),
     81 			     length);
     82 }
     83 
     84 /*
     85  * This is the top level routine of the printer.  'p' points
     86  * to the LANE header of the packet, 'h->ts' is the timestamp,
     87  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
     88  * is the number of bytes actually captured.
     89  *
     90  * This assumes 802.3, not 802.5, LAN emulation.
     91  */
     92 void
     93 lane_print(const u_char *p, u_int length, u_int caplen)
     94 {
     95 	struct lane_controlhdr *lec;
     96 	struct lecdatahdr_8023 *ep;
     97 	u_short ether_type;
     98 	u_short extracted_ethertype;
     99 
    100 	if (caplen < sizeof(struct lane_controlhdr)) {
    101 		printf("[|lane]");
    102 		return;
    103 	}
    104 
    105 	lec = (struct lane_controlhdr *)p;
    106 	if (EXTRACT_16BITS(&lec->lec_header) == 0xff00) {
    107 		/*
    108 		 * LE Control.
    109 		 */
    110 		printf("lec: proto %x vers %x %s",
    111 		    lec->lec_proto, lec->lec_vers,
    112 		    tok2str(lecop2str, "opcode-#%u", EXTRACT_16BITS(&lec->lec_opcode)));
    113 		return;
    114 	}
    115 
    116 	if (caplen < sizeof(struct lecdatahdr_8023)) {
    117 		printf("[|lane]");
    118 		return;
    119 	}
    120 
    121 	if (eflag)
    122 		lane_hdr_print(p, length);
    123 
    124 	/*
    125 	 * Go past the LANE header.
    126 	 */
    127 	length -= sizeof(struct lecdatahdr_8023);
    128 	caplen -= sizeof(struct lecdatahdr_8023);
    129 	ep = (struct lecdatahdr_8023 *)p;
    130 	p += sizeof(struct lecdatahdr_8023);
    131 
    132 	ether_type = EXTRACT_16BITS(&ep->h_type);
    133 
    134 	/*
    135 	 * Is it (gag) an 802.3 encapsulation?
    136 	 */
    137 	if (ether_type <= ETHERMTU) {
    138 		/* Try to print the LLC-layer header & higher layers */
    139 		if (llc_print(p, length, caplen, ep->h_source, ep->h_dest,
    140 		    &extracted_ethertype) == 0) {
    141 			/* ether_type not known, print raw packet */
    142 			if (!eflag)
    143 				lane_hdr_print((u_char *)ep, length + sizeof(*ep));
    144 			if (extracted_ethertype) {
    145 				printf("(LLC %s) ",
    146 			       etherproto_string(htons(extracted_ethertype)));
    147 			}
    148 			if (!suppress_default_print)
    149 				default_print(p, caplen);
    150 		}
    151 	} else if (ether_encap_print(ether_type, p, length, caplen,
    152 	    &extracted_ethertype) == 0) {
    153 		/* ether_type not known, print raw packet */
    154 		if (!eflag)
    155 			lane_hdr_print((u_char *)ep, length + sizeof(*ep));
    156 		if (!suppress_default_print)
    157 			default_print(p, caplen);
    158 	}
    159 }
    160 
    161 u_int
    162 lane_if_print(const struct pcap_pkthdr *h, const u_char *p)
    163 {
    164 	lane_print(p, h->len, h->caplen);
    165 
    166 	return (sizeof(struct lecdatahdr_8023));
    167 }
    168