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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 #define NETDISSECT_REWORKED
     24 #ifdef HAVE_CONFIG_H
     25 #include "config.h"
     26 #endif
     27 
     28 #include <tcpdump-stdinc.h>
     29 
     30 #include "interface.h"
     31 #include "extract.h"
     32 #include "ether.h"
     33 
     34 struct lecdatahdr_8023 {
     35   uint16_t le_header;
     36   uint8_t h_dest[ETHER_ADDR_LEN];
     37   uint8_t h_source[ETHER_ADDR_LEN];
     38   uint16_t h_type;
     39 };
     40 
     41 struct lane_controlhdr {
     42   uint16_t lec_header;
     43   uint8_t lec_proto;
     44   uint8_t lec_vers;
     45   uint16_t lec_opcode;
     46 };
     47 
     48 static const struct tok lecop2str[] = {
     49 	{ 0x0001,	"configure request" },
     50 	{ 0x0101,	"configure response" },
     51 	{ 0x0002,	"join request" },
     52 	{ 0x0102,	"join response" },
     53 	{ 0x0003,	"ready query" },
     54 	{ 0x0103,	"ready indication" },
     55 	{ 0x0004,	"register request" },
     56 	{ 0x0104,	"register response" },
     57 	{ 0x0005,	"unregister request" },
     58 	{ 0x0105,	"unregister response" },
     59 	{ 0x0006,	"ARP request" },
     60 	{ 0x0106,	"ARP response" },
     61 	{ 0x0007,	"flush request" },
     62 	{ 0x0107,	"flush response" },
     63 	{ 0x0008,	"NARP request" },
     64 	{ 0x0009,	"topology request" },
     65 	{ 0,		NULL }
     66 };
     67 
     68 static void
     69 lane_hdr_print(netdissect_options *ndo, const u_char *bp)
     70 {
     71 	ND_PRINT((ndo, "lecid:%x ", EXTRACT_16BITS(bp)));
     72 }
     73 
     74 /*
     75  * This is the top level routine of the printer.  'p' points
     76  * to the LANE header of the packet, 'h->ts' is the timestamp,
     77  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
     78  * is the number of bytes actually captured.
     79  *
     80  * This assumes 802.3, not 802.5, LAN emulation.
     81  */
     82 void
     83 lane_print(netdissect_options *ndo, const u_char *p, u_int length, u_int caplen)
     84 {
     85 	struct lane_controlhdr *lec;
     86 
     87 	if (caplen < sizeof(struct lane_controlhdr)) {
     88 		ND_PRINT((ndo, "[|lane]"));
     89 		return;
     90 	}
     91 
     92 	lec = (struct lane_controlhdr *)p;
     93 	if (EXTRACT_16BITS(&lec->lec_header) == 0xff00) {
     94 		/*
     95 		 * LE Control.
     96 		 */
     97 		ND_PRINT((ndo, "lec: proto %x vers %x %s",
     98 		    lec->lec_proto, lec->lec_vers,
     99 		    tok2str(lecop2str, "opcode-#%u", EXTRACT_16BITS(&lec->lec_opcode))));
    100 		return;
    101 	}
    102 
    103 	/*
    104 	 * Go past the LE header.
    105 	 */
    106 	length -= 2;
    107 	caplen -= 2;
    108 	p += 2;
    109 
    110 	/*
    111 	 * Now print the encapsulated frame, under the assumption
    112 	 * that it's an Ethernet frame.
    113 	 */
    114 	ether_print(ndo, p, length, caplen, lane_hdr_print, p - 2);
    115 }
    116 
    117 u_int
    118 lane_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, const u_char *p)
    119 {
    120 	lane_print(ndo, p, h->len, h->caplen);
    121 
    122 	return (sizeof(struct lecdatahdr_8023));
    123 }
    124