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

   1 /*
   2  * Copyright (c) 1998-2006 The TCPDUMP project
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that: (1) source code
   6  * distributions retain the above copyright notice and this paragraph
   7  * in its entirety, and (2) distributions including binary code include
   8  * the above copyright notice and this paragraph in its entirety in
   9  * the documentation or other materials provided with the distribution.
  10  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND
  11  * WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT
  12  * LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  13  * FOR A PARTICULAR PURPOSE.
  14  *
  15  * Original code by Hannes Gredler (hannes@gredler.at)
  16  */
  17
  18 /* \summary: IEEE 802.3ah Multi-Point Control Protocol (MPCP) printer */
  19
  20 #ifdef HAVE_CONFIG_H
  21 #include "config.h"
  22 #endif
  23
  24 #include <netdissect-stdinc.h>
  25
  26 #include "netdissect.h"
  27 #include "extract.h"
  28
  29 struct mpcp_common_header_t {
  30     nd_uint16_t opcode;
  31     nd_uint32_t timestamp;
  32 };
  33
  34 #define MPCP_OPCODE_PAUSE   0x0001
  35 #define MPCP_OPCODE_GATE    0x0002
  36 #define MPCP_OPCODE_REPORT  0x0003
  37 #define MPCP_OPCODE_REG_REQ 0x0004
  38 #define MPCP_OPCODE_REG     0x0005
  39 #define MPCP_OPCODE_REG_ACK 0x0006
  40
  41 static const struct tok mpcp_opcode_values[] = {
  42     { MPCP_OPCODE_PAUSE, "Pause" },
  43     { MPCP_OPCODE_GATE, "Gate" },
  44     { MPCP_OPCODE_REPORT, "Report" },
  45     { MPCP_OPCODE_REG_REQ, "Register Request" },
  46     { MPCP_OPCODE_REG, "Register" },
  47     { MPCP_OPCODE_REG_ACK, "Register ACK" },
  48     { 0, NULL}
  49 };
  50
  51 #define MPCP_GRANT_NUMBER_LEN 1
  52 #define MPCP_GRANT_NUMBER_MASK 0x7
  53 static const struct tok mpcp_grant_flag_values[] = {
  54     { 0x08, "Discovery" },
  55     { 0x10, "Force Grant #1" },
  56     { 0x20, "Force Grant #2" },
  57     { 0x40, "Force Grant #3" },
  58     { 0x80, "Force Grant #4" },
  59     { 0, NULL}
  60 };
  61
  62 struct mpcp_grant_t {
  63     nd_uint32_t starttime;
  64     nd_uint16_t duration;
  65 };
  66
  67 struct mpcp_reg_req_t {
  68     nd_uint8_t flags;
  69     nd_uint8_t pending_grants;
  70 };
  71
  72
  73 static const struct tok mpcp_reg_req_flag_values[] = {
  74     { 1, "Register" },
  75     { 3, "De-Register" },
  76     { 0, NULL}
  77 };
  78
  79 struct mpcp_reg_t {
  80     nd_uint16_t assigned_port;
  81     nd_uint8_t  flags;
  82     nd_uint16_t sync_time;
  83     nd_uint8_t  echoed_pending_grants;
  84 };
  85
  86 static const struct tok mpcp_reg_flag_values[] = {
  87     { 1, "Re-Register" },
  88     { 2, "De-Register" },
  89     { 3, "ACK" },
  90     { 4, "NACK" },
  91     { 0, NULL}
  92 };
  93
  94 #define MPCP_REPORT_QUEUESETS_LEN    1
  95 #define MPCP_REPORT_REPORTBITMAP_LEN 1
  96 static const struct tok mpcp_report_bitmap_values[] = {
  97     { 0x01, "Q0" },
  98     { 0x02, "Q1" },
  99     { 0x04, "Q2" },
 100     { 0x08, "Q3" },
 101     { 0x10, "Q4" },
 102     { 0x20, "Q5" },
 103     { 0x40, "Q6" },
 104     { 0x80, "Q7" },
 105     { 0, NULL}
 106 };
 107
 108 struct mpcp_reg_ack_t {
 109     nd_uint8_t  flags;
 110     nd_uint16_t echoed_assigned_port;
 111     nd_uint16_t echoed_sync_time;
 112 };
 113
 114 static const struct tok mpcp_reg_ack_flag_values[] = {
 115     { 0, "NACK" },
 116     { 1, "ACK" },
 117     { 0, NULL}
 118 };
 119
 120 void
 121 mpcp_print(netdissect_options *ndo, const u_char *pptr, u_int length)
 122 {
 123     union {
 124         const struct mpcp_common_header_t *common_header;
 125         const struct mpcp_grant_t *grant;
 126         const struct mpcp_reg_req_t *reg_req;
 127         const struct mpcp_reg_t *reg;
 128         const struct mpcp_reg_ack_t *reg_ack;
 129     } mpcp;
 130
 131
 132     const u_char *tptr;
 133     uint16_t opcode;
 134     uint8_t grant_numbers, grant;
 135     uint8_t queue_sets, queue_set, report_bitmap, report;
 136
 137     tptr=pptr;
 138     mpcp.common_header = (const struct mpcp_common_header_t *)pptr;
 139
 140     ND_TCHECK_LEN(tptr, sizeof(struct mpcp_common_header_t));
 141     opcode = EXTRACT_BE_U_2(mpcp.common_header->opcode);
 142     ND_PRINT("MPCP, Opcode %s", tok2str(mpcp_opcode_values, "Unknown (%u)", opcode));
 143     if (opcode != MPCP_OPCODE_PAUSE) {
 144         ND_PRINT(", Timestamp %u ticks", EXTRACT_BE_U_4(mpcp.common_header->timestamp));
 145     }
 146     ND_PRINT(", length %u", length);
 147
 148     if (!ndo->ndo_vflag)
 149         return;
 150
 151     tptr += sizeof(struct mpcp_common_header_t);
 152
 153     switch (opcode) {
 154     case MPCP_OPCODE_PAUSE:
 155         break;
 156
 157     case MPCP_OPCODE_GATE:
 158         ND_TCHECK_LEN(tptr, MPCP_GRANT_NUMBER_LEN);
 159         grant_numbers = EXTRACT_U_1(tptr) & MPCP_GRANT_NUMBER_MASK;
 160         ND_PRINT("\n\tGrant Numbers %u, Flags [ %s ]",
 161                grant_numbers,
 162                bittok2str(mpcp_grant_flag_values,
 163                           "?",
 164                           EXTRACT_U_1(tptr) & ~MPCP_GRANT_NUMBER_MASK));
 165         tptr++;
 166
 167         for (grant = 1; grant <= grant_numbers; grant++) {
 168             ND_TCHECK_LEN(tptr, sizeof(struct mpcp_grant_t));
 169             mpcp.grant = (const struct mpcp_grant_t *)tptr;
 170             ND_PRINT("\n\tGrant #%u, Start-Time %u ticks, duration %u ticks",
 171                    grant,
 172                    EXTRACT_BE_U_4(mpcp.grant->starttime),
 173                    EXTRACT_BE_U_2(mpcp.grant->duration));
 174             tptr += sizeof(struct mpcp_grant_t);
 175         }
 176
 177         ND_TCHECK_2(tptr);
 178         ND_PRINT("\n\tSync-Time %u ticks", EXTRACT_BE_U_2(tptr));
 179         break;
 180
 181
 182     case MPCP_OPCODE_REPORT:
 183         ND_TCHECK_LEN(tptr, MPCP_REPORT_QUEUESETS_LEN);
 184         queue_sets = EXTRACT_U_1(tptr);
 185         tptr+=MPCP_REPORT_QUEUESETS_LEN;
 186         ND_PRINT("\n\tTotal Queue-Sets %u", queue_sets);
 187
 188         for (queue_set = 1; queue_set < queue_sets; queue_set++) {
 189             ND_TCHECK_LEN(tptr, MPCP_REPORT_REPORTBITMAP_LEN);
 190             report_bitmap = EXTRACT_U_1(tptr);
 191             ND_PRINT("\n\t  Queue-Set #%u, Report-Bitmap [ %s ]",
 192                    queue_sets,
 193                    bittok2str(mpcp_report_bitmap_values, "Unknown", report_bitmap));
 194             tptr++;
 195
 196             report=1;
 197             while (report_bitmap != 0) {
 198                 if (report_bitmap & 1) {
 199                     ND_TCHECK_2(tptr);
 200                     ND_PRINT("\n\t    Q%u Report, Duration %u ticks",
 201                            report,
 202                            EXTRACT_BE_U_2(tptr));
 203                     tptr += 2;
 204                 }
 205                 report++;
 206                 report_bitmap = report_bitmap >> 1;
 207             }
 208         }
 209         break;
 210
 211     case MPCP_OPCODE_REG_REQ:
 212         ND_TCHECK_LEN(tptr, sizeof(struct mpcp_reg_req_t));
 213         mpcp.reg_req = (const struct mpcp_reg_req_t *)tptr;
 214         ND_PRINT("\n\tFlags [ %s ], Pending-Grants %u",
 215                bittok2str(mpcp_reg_req_flag_values, "Reserved", EXTRACT_U_1(mpcp.reg_req->flags)),
 216                EXTRACT_U_1(mpcp.reg_req->pending_grants));
 217         break;
 218
 219     case MPCP_OPCODE_REG:
 220         ND_TCHECK_LEN(tptr, sizeof(struct mpcp_reg_t));
 221         mpcp.reg = (const struct mpcp_reg_t *)tptr;
 222         ND_PRINT("\n\tAssigned-Port %u, Flags [ %s ]"
 223                "\n\tSync-Time %u ticks, Echoed-Pending-Grants %u",
 224                EXTRACT_BE_U_2(mpcp.reg->assigned_port),
 225                bittok2str(mpcp_reg_flag_values, "Reserved", EXTRACT_U_1(mpcp.reg->flags)),
 226                EXTRACT_BE_U_2(mpcp.reg->sync_time),
 227                EXTRACT_U_1(mpcp.reg->echoed_pending_grants));
 228         break;
 229
 230     case MPCP_OPCODE_REG_ACK:
 231         ND_TCHECK_LEN(tptr, sizeof(struct mpcp_reg_ack_t));
 232         mpcp.reg_ack = (const struct mpcp_reg_ack_t *)tptr;
 233         ND_PRINT("\n\tEchoed-Assigned-Port %u, Flags [ %s ]"
 234                "\n\tEchoed-Sync-Time %u ticks",
 235                EXTRACT_BE_U_2(mpcp.reg_ack->echoed_assigned_port),
 236                bittok2str(mpcp_reg_ack_flag_values, "Reserved", EXTRACT_U_1(mpcp.reg_ack->flags)),
 237                EXTRACT_BE_U_2(mpcp.reg_ack->echoed_sync_time));
 238         break;
 239
 240     default:
 241         /* unknown opcode - hexdump for now */
 242         print_unknown_data(ndo,pptr, "\n\t", length);
 243         break;
 244     }
 245
 246     return;
 247
 248 trunc:
 249     ND_PRINT("\n\t[|MPCP]");
 250 }
 251 /*
 252  * Local Variables:
 253  * c-style: whitesmith
 254  * c-basic-offset: 8
 255  * End:
 256  */