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