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 /* \summary: ATM LANE printer */
  24
  25 #include <config.h>
  26
  27 #include "netdissect-stdinc.h"
  28
  29 #define ND_LONGJMP_FROM_TCHECK
  30 #include "netdissect.h"
  31 #include "extract.h"
  32
  33 struct lecdatahdr_8023 {
  34   nd_uint16_t le_header;
  35   nd_mac48 h_dest;
  36   nd_mac48 h_source;
  37   nd_uint16_t h_type;
  38 };
  39
  40 struct lane_controlhdr {
  41   nd_uint16_t lec_header;
  42   nd_uint8_t  lec_proto;
  43   nd_uint8_t  lec_vers;
  44   nd_uint16_t lec_opcode;
  45 };
  46
  47 static const struct tok lecop2str[] = {
  48         { 0x0001,       "configure request" },
  49         { 0x0101,       "configure response" },
  50         { 0x0002,       "join request" },
  51         { 0x0102,       "join response" },
  52         { 0x0003,       "ready query" },
  53         { 0x0103,       "ready indication" },
  54         { 0x0004,       "register request" },
  55         { 0x0104,       "register response" },
  56         { 0x0005,       "unregister request" },
  57         { 0x0105,       "unregister response" },
  58         { 0x0006,       "ARP request" },
  59         { 0x0106,       "ARP response" },
  60         { 0x0007,       "flush request" },
  61         { 0x0107,       "flush response" },
  62         { 0x0008,       "NARP request" },
  63         { 0x0009,       "topology request" },
  64         { 0,            NULL }
  65 };
  66
  67 static void
  68 lane_hdr_print(netdissect_options *ndo, const u_char *bp)
  69 {
  70         ND_PRINT("lecid:%x ", GET_BE_U_2(bp));
  71 }
  72
  73 /*
  74  * This assumes 802.3, not 802.5, LAN emulation.
  75  */
  76 void
  77 lane_print(netdissect_options *ndo, const u_char *p, u_int length, u_int caplen)
  78 {
  79         const struct lane_controlhdr *lec;
  80
  81         ndo->ndo_protocol = "lane";
  82
  83         lec = (const struct lane_controlhdr *)p;
  84         if (GET_BE_U_2(lec->lec_header) == 0xff00) {
  85                 /*
  86                  * LE Control.
  87                  */
  88                 ND_PRINT("lec: proto %x vers %x %s",
  89                          GET_U_1(lec->lec_proto),
  90                          GET_U_1(lec->lec_vers),
  91                          tok2str(lecop2str, "opcode-#%u", GET_BE_U_2(lec->lec_opcode)));
  92                 return;
  93         }
  94
  95         /*
  96          * Go past the LE header.
  97          */
  98         ND_TCHECK_2(p); /* Needed */
  99         length -= 2;
 100         caplen -= 2;
 101         p += 2;
 102
 103         /*
 104          * Now print the encapsulated frame, under the assumption
 105          * that it's an Ethernet frame.
 106          */
 107         ether_print(ndo, p, length, caplen, lane_hdr_print, p - 2);
 108 }