nexmon – Rev 1

Subversion Repositories:
Rev:
/*
 * Marko Kiiskila carnil@cs.tut.fi
 *
 * Tampere University of Technology - Telecommunications Laboratory
 *
 * Permission to use, copy, modify and distribute this
 * software and its documentation is hereby granted,
 * provided that both the copyright notice and this
 * permission notice appear in all copies of the software,
 * derivative works or modified versions, and any portions
 * thereof, that both notices appear in supporting
 * documentation, and that the use of this software is
 * acknowledged in any publications resulting from using
 * the software.
 *
 * TUT ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
 * CONDITION AND DISCLAIMS ANY LIABILITY OF ANY KIND FOR
 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS
 * SOFTWARE.
 *
 */

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

#include <tcpdump-stdinc.h>

#include "interface.h"
#include "extract.h"
#include "ether.h"

struct lecdatahdr_8023 {
  uint16_t le_header;
  uint8_t h_dest[ETHER_ADDR_LEN];
  uint8_t h_source[ETHER_ADDR_LEN];
  uint16_t h_type;
};

struct lane_controlhdr {
  uint16_t lec_header;
  uint8_t lec_proto;
  uint8_t lec_vers;
  uint16_t lec_opcode;
};

static const struct tok lecop2str[] = {
        { 0x0001,       "configure request" },
        { 0x0101,       "configure response" },
        { 0x0002,       "join request" },
        { 0x0102,       "join response" },
        { 0x0003,       "ready query" },
        { 0x0103,       "ready indication" },
        { 0x0004,       "register request" },
        { 0x0104,       "register response" },
        { 0x0005,       "unregister request" },
        { 0x0105,       "unregister response" },
        { 0x0006,       "ARP request" },
        { 0x0106,       "ARP response" },
        { 0x0007,       "flush request" },
        { 0x0107,       "flush response" },
        { 0x0008,       "NARP request" },
        { 0x0009,       "topology request" },
        { 0,            NULL }
};

static void
lane_hdr_print(netdissect_options *ndo, const u_char *bp)
{
        ND_PRINT((ndo, "lecid:%x ", EXTRACT_16BITS(bp)));
}

/*
 * This is the top level routine of the printer.  'p' points
 * to the LANE 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.
 *
 * This assumes 802.3, not 802.5, LAN emulation.
 */
void
lane_print(netdissect_options *ndo, const u_char *p, u_int length, u_int caplen)
{
        struct lane_controlhdr *lec;

        if (caplen < sizeof(struct lane_controlhdr)) {
                ND_PRINT((ndo, "[|lane]"));
                return;
        }

        lec = (struct lane_controlhdr *)p;
        if (EXTRACT_16BITS(&lec->lec_header) == 0xff00) {
                /*
                 * LE Control.
                 */
                ND_PRINT((ndo, "lec: proto %x vers %x %s",
                    lec->lec_proto, lec->lec_vers,
                    tok2str(lecop2str, "opcode-#%u", EXTRACT_16BITS(&lec->lec_opcode))));
                return;
        }

        /*
         * Go past the LE header.
         */
        length -= 2;
        caplen -= 2;
        p += 2;

        /*
         * Now print the encapsulated frame, under the assumption
         * that it's an Ethernet frame.
         */
        ether_print(ndo, p, length, caplen, lane_hdr_print, p - 2);
}

u_int
lane_if_print(netdissect_options *ndo, const struct pcap_pkthdr *h, const u_char *p)
{
        lane_print(ndo, p, h->len, h->caplen);

        return (sizeof(struct lecdatahdr_8023));
}