The Tcpdump Group git mirrors - tcpdump/blob - print-lane.c

   1 /*
   2  * Marko Kiiskila carnil@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 #ifdef HAVE_CONFIG_H
  24 #include "config.h"
  25 #endif
  26
  27 #include <tcpdump-stdinc.h>
  28
  29 #include <stdio.h>
  30 #include <pcap.h>
  31
  32 #include "interface.h"
  33 #include "addrtoname.h"
  34 #include "extract.h"
  35 #include "ether.h"
  36
  37 #ifndef ETHER_ADDR_LEN
  38 #define ETHER_ADDR_LEN 6
  39 #endif
  40
  41 struct lecdatahdr_8023 {
  42   u_int16_t le_header;
  43   u_int8_t h_dest[ETHER_ADDR_LEN];
  44   u_int8_t h_source[ETHER_ADDR_LEN];
  45   u_int16_t h_type;
  46 };
  47
  48 struct lane_controlhdr {
  49   u_int16_t lec_header;
  50   u_int8_t lec_proto;
  51   u_int8_t lec_vers;
  52   u_int16_t lec_opcode;
  53 };
  54
  55 static const struct tok lecop2str[] = {
  56         { 0x0001,       "configure request" },
  57         { 0x0101,       "configure response" },
  58         { 0x0002,       "join request" },
  59         { 0x0102,       "join response" },
  60         { 0x0003,       "ready query" },
  61         { 0x0103,       "ready indication" },
  62         { 0x0004,       "register request" },
  63         { 0x0104,       "register response" },
  64         { 0x0005,       "unregister request" },
  65         { 0x0105,       "unregister response" },
  66         { 0x0006,       "ARP request" },
  67         { 0x0106,       "ARP response" },
  68         { 0x0007,       "flush request" },
  69         { 0x0107,       "flush response" },
  70         { 0x0008,       "NARP request" },
  71         { 0x0009,       "topology request" },
  72         { 0,            NULL }
  73 };
  74
  75 static void
  76 lane_hdr_print(netdissect_options *ndo, const u_char *bp)
  77 {
  78         (void)ND_PRINT((ndo, "lecid:%x ", EXTRACT_16BITS(bp)));
  79 }
  80
  81 /*
  82  * This is the top level routine of the printer.  'p' points
  83  * to the LANE header of the packet, 'h->ts' is the timestamp,
  84  * 'h->len' is the length of the packet off the wire, and 'h->caplen'
  85  * is the number of bytes actually captured.
  86  *
  87  * This assumes 802.3, not 802.5, LAN emulation.
  88  */
  89 void
  90 lane_print(const u_char *p, u_int length, u_int caplen)
  91 {
  92         struct lane_controlhdr *lec;
  93
  94         if (caplen < sizeof(struct lane_controlhdr)) {
  95                 printf("[|lane]");
  96                 return;
  97         }
  98
  99         lec = (struct lane_controlhdr *)p;
 100         if (EXTRACT_16BITS(&lec->lec_header) == 0xff00) {
 101                 /*
 102                  * LE Control.
 103                  */
 104                 printf("lec: proto %x vers %x %s",
 105                     lec->lec_proto, lec->lec_vers,
 106                     tok2str(lecop2str, "opcode-#%u", EXTRACT_16BITS(&lec->lec_opcode)));
 107                 return;
 108         }
 109
 110         /*
 111          * Go past the LE header.
 112          */
 113         length -= 2;
 114         caplen -= 2;
 115         p += 2;
 116
 117         /*
 118          * Now print the encapsulated frame, under the assumption
 119          * that it's an Ethernet frame.
 120          */
 121         ether_print(gndo, p, length, caplen, lane_hdr_print, p - 2);
 122 }
 123
 124 u_int
 125 lane_if_print(const struct pcap_pkthdr *h, const u_char *p)
 126 {
 127         lane_print(p, h->len, h->caplen);
 128
 129         return (sizeof(struct lecdatahdr_8023));
 130 }