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  * support for the IEEE MPCP protocol as per 802.3ah
  16  *
  17  * Original code by Hannes Gredler (hannes@juniper.net)
  18  */
  19
  20 #ifdef HAVE_CONFIG_H
  21 #include "config.h"
  22 #endif
  23
  24 #include <tcpdump-stdinc.h>
  25
  26 #include <stdio.h>
  27 #include <stdlib.h>
  28 #include <string.h>
  29
  30 #include "interface.h"
  31 #include "extract.h"
  32 #include "addrtoname.h"
  33 #include "ether.h"
  34
  35 #define MPCP_TIMESTAMP_LEN        4
  36 #define MPCP_TIMESTAMP_DURATION_LEN 2
  37
  38 struct mpcp_common_header_t {
  39     u_int8_t opcode[2];
  40     u_int8_t timestamp[MPCP_TIMESTAMP_LEN];
  41 };
  42
  43 #define MPCP_OPCODE_PAUSE   0x0001
  44 #define MPCP_OPCODE_GATE    0x0002
  45 #define MPCP_OPCODE_REPORT  0x0003
  46 #define MPCP_OPCODE_REG_REQ 0x0004
  47 #define MPCP_OPCODE_REG     0x0005
  48 #define MPCP_OPCODE_REG_ACK 0x0006
  49
  50 static const struct tok mpcp_opcode_values[] = {
  51     { MPCP_OPCODE_PAUSE, "Pause" },
  52     { MPCP_OPCODE_GATE, "Gate" },
  53     { MPCP_OPCODE_REPORT, "Report" },
  54     { MPCP_OPCODE_REG_REQ, "Register Request" },
  55     { MPCP_OPCODE_REG, "Register" },
  56     { MPCP_OPCODE_REG_ACK, "Register ACK" },
  57     { 0, NULL}
  58 };
  59
  60 #define MPCP_GRANT_NUMBER_LEN 1
  61 #define MPCP_GRANT_NUMBER_MASK 0x7
  62 static const struct tok mpcp_grant_flag_values[] = {
  63     { 0x08, "Discovery" },
  64     { 0x10, "Force Grant #1" },
  65     { 0x20, "Force Grant #2" },
  66     { 0x40, "Force Grant #3" },
  67     { 0x80, "Force Grant #4" },
  68     { 0, NULL}
  69 };
  70
  71 struct mpcp_grant_t {
  72     u_int8_t starttime[MPCP_TIMESTAMP_LEN];
  73     u_int8_t duration[MPCP_TIMESTAMP_DURATION_LEN];
  74 };
  75
  76 struct mpcp_reg_req_t {
  77     u_int8_t flags;
  78     u_int8_t pending_grants;
  79 };
  80
  81
  82 static const struct tok mpcp_reg_req_flag_values[] = {
  83     { 1, "Register" },
  84     { 3, "De-Register" },
  85     { 0, NULL}
  86 };
  87
  88 struct mpcp_reg_t {
  89     u_int8_t assigned_port[2];
  90     u_int8_t flags;
  91     u_int8_t sync_time[MPCP_TIMESTAMP_DURATION_LEN];
  92     u_int8_t echoed_pending_grants;
  93 };
  94
  95 static const struct tok mpcp_reg_flag_values[] = {
  96     { 1, "Re-Register" },
  97     { 2, "De-Register" },
  98     { 3, "ACK" },
  99     { 4, "NACK" },
 100     { 0, NULL}
 101 };
 102
 103 #define MPCP_REPORT_QUEUESETS_LEN    1
 104 #define MPCP_REPORT_REPORTBITMAP_LEN 1
 105 static const struct tok mpcp_report_bitmap_values[] = {
 106     { 0x01, "Q0" },
 107     { 0x02, "Q1" },
 108     { 0x04, "Q2" },
 109     { 0x08, "Q3" },
 110     { 0x10, "Q4" },
 111     { 0x20, "Q5" },
 112     { 0x40, "Q6" },
 113     { 0x80, "Q7" },
 114     { 0, NULL}
 115 };
 116
 117 struct mpcp_reg_ack_t {
 118     u_int8_t flags;
 119     u_int8_t echoed_assigned_port[2];
 120     u_int8_t echoed_sync_time[MPCP_TIMESTAMP_DURATION_LEN];
 121 };
 122
 123 static const struct tok mpcp_reg_ack_flag_values[] = {
 124     { 0, "NACK" },
 125     { 1, "ACK" },
 126     { 0, NULL}
 127 };
 128
 129 void
 130 mpcp_print(register const u_char *pptr, register u_int length) {
 131
 132     union {
 133         const struct mpcp_common_header_t *common_header;
 134         const struct mpcp_grant_t *grant;
 135         const struct mpcp_reg_req_t *reg_req;
 136         const struct mpcp_reg_t *reg;
 137         const struct mpcp_reg_ack_t *reg_ack;
 138     } mpcp;
 139
 140
 141     const u_char *tptr;
 142     u_int16_t opcode;
 143     u_int8_t grant_numbers, grant;
 144     u_int8_t queue_sets, queue_set, report_bitmap, report;
 145
 146     tptr=pptr;
 147     mpcp.common_header = (const struct mpcp_common_header_t *)pptr;
 148
 149     if (!TTEST2(*tptr, sizeof(const struct mpcp_common_header_t)))
 150         goto trunc;
 151     opcode = EXTRACT_16BITS(mpcp.common_header->opcode);
 152     printf("MPCP, Opcode %s", tok2str(mpcp_opcode_values, "Unknown (%u)", opcode));
 153     if (opcode != MPCP_OPCODE_PAUSE) {
 154         printf(", Timestamp %u ticks", EXTRACT_32BITS(mpcp.common_header->timestamp));
 155     }
 156     printf(", length %u", length);
 157
 158     if (!vflag)
 159         return;
 160
 161     tptr += sizeof(const struct mpcp_common_header_t);
 162
 163     switch (opcode) {
 164     case MPCP_OPCODE_PAUSE:
 165         break;
 166
 167     case MPCP_OPCODE_GATE:
 168         if (!TTEST2(*tptr, MPCP_GRANT_NUMBER_LEN))
 169             goto trunc;
 170         grant_numbers = *tptr & MPCP_GRANT_NUMBER_MASK;
 171         printf("\n\tGrant Numbers %u, Flags [ %s ]",
 172                grant_numbers,
 173                bittok2str(mpcp_grant_flag_values,
 174                           "?",
 175                           *tptr &~ MPCP_GRANT_NUMBER_MASK));
 176         tptr++;
 177
 178         for (grant = 1; grant <= grant_numbers; grant++) {
 179             if (!TTEST2(*tptr, sizeof(const struct mpcp_grant_t)))
 180                 goto trunc;
 181             mpcp.grant = (const struct mpcp_grant_t *)tptr;
 182             printf("\n\tGrant #%u, Start-Time %u ticks, duration %u ticks",
 183                    grant,
 184                    EXTRACT_32BITS(mpcp.grant->starttime),
 185                    EXTRACT_16BITS(mpcp.grant->duration));
 186             tptr += sizeof(const struct mpcp_grant_t);
 187         }
 188
 189         if (!TTEST2(*tptr, MPCP_TIMESTAMP_DURATION_LEN))
 190             goto trunc;
 191         printf("\n\tSync-Time %u ticks", EXTRACT_16BITS(tptr));
 192         break;
 193
 194
 195     case MPCP_OPCODE_REPORT:
 196         if (!TTEST2(*tptr, MPCP_REPORT_QUEUESETS_LEN))
 197             goto trunc;
 198         queue_sets = *tptr;
 199         tptr+=MPCP_REPORT_QUEUESETS_LEN;
 200         printf("\n\tTotal Queue-Sets %u", queue_sets);
 201
 202         for (queue_set = 1; queue_set < queue_sets; queue_set++) {
 203             if (!TTEST2(*tptr, MPCP_REPORT_REPORTBITMAP_LEN))
 204                 goto trunc;
 205             report_bitmap = *(tptr);
 206             printf("\n\t  Queue-Set #%u, Report-Bitmap [ %s ]",
 207                    queue_sets,
 208                    bittok2str(mpcp_report_bitmap_values, "Unknown", report_bitmap));
 209             tptr++;
 210
 211             report=1;
 212             while (report_bitmap != 0) {
 213                 if (report_bitmap & 1) {
 214                     if (!TTEST2(*tptr, MPCP_TIMESTAMP_DURATION_LEN))
 215                         goto trunc;
 216                     printf("\n\t    Q%u Report, Duration %u ticks",
 217                            report,
 218                            EXTRACT_16BITS(tptr));
 219                     tptr+=MPCP_TIMESTAMP_DURATION_LEN;
 220                 }
 221                 report++;
 222                 report_bitmap = report_bitmap >> 1;
 223             }
 224         }
 225         break;
 226
 227     case MPCP_OPCODE_REG_REQ:
 228         if (!TTEST2(*tptr, sizeof(const struct mpcp_reg_req_t)))
 229             goto trunc;
 230         mpcp.reg_req = (const struct mpcp_reg_req_t *)tptr;
 231         printf("\n\tFlags [ %s ], Pending-Grants %u",
 232                bittok2str(mpcp_reg_req_flag_values, "Reserved", mpcp.reg_req->flags),
 233                mpcp.reg_req->pending_grants);
 234         break;
 235
 236     case MPCP_OPCODE_REG:
 237         if (!TTEST2(*tptr, sizeof(const struct mpcp_reg_t)))
 238             goto trunc;
 239         mpcp.reg = (const struct mpcp_reg_t *)tptr;
 240         printf("\n\tAssigned-Port %u, Flags [ %s ]" \
 241                "\n\tSync-Time %u ticks, Echoed-Pending-Grants %u",
 242                EXTRACT_16BITS(mpcp.reg->assigned_port),
 243                bittok2str(mpcp_reg_flag_values, "Reserved", mpcp.reg->flags),
 244                EXTRACT_16BITS(mpcp.reg->sync_time),
 245                mpcp.reg->echoed_pending_grants);
 246         break;
 247
 248     case MPCP_OPCODE_REG_ACK:
 249         if (!TTEST2(*tptr, sizeof(const struct mpcp_reg_ack_t)))
 250             goto trunc;
 251         mpcp.reg_ack = (const struct mpcp_reg_ack_t *)tptr;
 252         printf("\n\tEchoed-Assigned-Port %u, Flags [ %s ]" \
 253                "\n\tEchoed-Sync-Time %u ticks",
 254                EXTRACT_16BITS(mpcp.reg_ack->echoed_assigned_port),
 255                bittok2str(mpcp_reg_ack_flag_values, "Reserved", mpcp.reg_ack->flags),
 256                EXTRACT_16BITS(mpcp.reg_ack->echoed_sync_time));
 257         break;
 258
 259     default:
 260         /* unknown opcode - hexdump for now */
 261         print_unknown_data(gndo,pptr, "\n\t", length);
 262         break;
 263     }
 264
 265     return;
 266
 267 trunc:
 268     printf("\n\t[|MPCP]");
 269 }
 270 /*
 271  * Local Variables:
 272  * c-style: whitesmith
 273  * c-basic-offset: 8
 274  * End:
 275  */