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 #ifndef lint
  21 static const char rcsid[] _U_ =
  22     "@(#) $Header: /tcpdump/master/tcpdump/print-mpcp.c,v 1.2 2006-02-10 17:24:55 hannes Exp $";
  23 #endif
  24
  25 #ifdef HAVE_CONFIG_H
  26 #include "config.h"
  27 #endif
  28
  29 #include <tcpdump-stdinc.h>
  30
  31 #include <stdio.h>
  32 #include <stdlib.h>
  33 #include <string.h>
  34
  35 #include "interface.h"
  36 #include "extract.h"
  37 #include "addrtoname.h"
  38 #include "ether.h"
  39
  40 #define MPCP_TIMESTAMP_LEN        4
  41 #define MPCP_TIMESTAMP_DURATION_LEN 2
  42
  43 struct mpcp_common_header_t {
  44     u_int8_t opcode[2];
  45     u_int8_t timestamp[MPCP_TIMESTAMP_LEN];
  46 };
  47
  48 #define MPCP_OPCODE_PAUSE   0x0001
  49 #define MPCP_OPCODE_GATE    0x0002
  50 #define MPCP_OPCODE_REPORT  0x0003
  51 #define MPCP_OPCODE_REG_REQ 0x0004
  52 #define MPCP_OPCODE_REG     0x0005
  53 #define MPCP_OPCODE_REG_ACK 0x0006
  54
  55 static const struct tok mpcp_opcode_values[] = {
  56     { MPCP_OPCODE_PAUSE, "Pause" },
  57     { MPCP_OPCODE_GATE, "Gate" },
  58     { MPCP_OPCODE_REPORT, "Report" },
  59     { MPCP_OPCODE_REG_REQ, "Register Request" },
  60     { MPCP_OPCODE_REG, "Register" },
  61     { MPCP_OPCODE_REG_ACK, "Register ACK" },
  62     { 0, NULL}
  63 };
  64
  65 #define MPCP_GRANT_NUMBER_LEN 1
  66 #define MPCP_GRANT_NUMBER_MASK 0x7
  67 static const struct tok mpcp_grant_flag_values[] = {
  68     { 0x08, "Discovery" },
  69     { 0x10, "Force Grant #1" },
  70     { 0x20, "Force Grant #2" },
  71     { 0x40, "Force Grant #3" },
  72     { 0x80, "Force Grant #4" },
  73     { 0, NULL}
  74 };
  75
  76 struct mpcp_grant_t {
  77     u_int8_t starttime[MPCP_TIMESTAMP_LEN];
  78     u_int8_t duration[MPCP_TIMESTAMP_DURATION_LEN];
  79 };
  80
  81 struct mpcp_reg_req_t {
  82     u_int8_t flags;
  83     u_int8_t pending_grants;
  84 };
  85
  86
  87 static const struct tok mpcp_reg_req_flag_values[] = {
  88     { 1, "Register" },
  89     { 3, "De-Register" },
  90     { 0, NULL}
  91 };
  92
  93 struct mpcp_reg_t {
  94     u_int8_t assigned_port[2];
  95     u_int8_t flags;
  96     u_int8_t sync_time[MPCP_TIMESTAMP_DURATION_LEN];
  97     u_int8_t echoed_pending_grants;
  98 };
  99
 100 static const struct tok mpcp_reg_flag_values[] = {
 101     { 1, "Re-Register" },
 102     { 2, "De-Register" },
 103     { 3, "ACK" },
 104     { 4, "NACK" },
 105     { 0, NULL}
 106 };
 107
 108 #define MPCP_REPORT_QUEUESETS_LEN    1
 109 #define MPCP_REPORT_REPORTBITMAP_LEN 1
 110 static const struct tok mpcp_report_bitmap_values[] = {
 111     { 0x01, "Q0" },
 112     { 0x02, "Q1" },
 113     { 0x04, "Q2" },
 114     { 0x08, "Q3" },
 115     { 0x10, "Q4" },
 116     { 0x20, "Q5" },
 117     { 0x40, "Q6" },
 118     { 0x80, "Q7" },
 119     { 0, NULL}
 120 };
 121
 122 struct mpcp_reg_ack_t {
 123     u_int8_t flags;
 124     u_int8_t echoed_assigned_port[2];
 125     u_int8_t echoed_sync_time[MPCP_TIMESTAMP_DURATION_LEN];
 126 };
 127
 128 static const struct tok mpcp_reg_ack_flag_values[] = {
 129     { 0, "NACK" },
 130     { 1, "ACK" },
 131     { 0, NULL}
 132 };
 133
 134 void
 135 mpcp_print(register const u_char *pptr, register u_int length) {
 136
 137     union {
 138         const struct mpcp_common_header_t *common_header;
 139         const struct mpcp_grant_t *grant;
 140         const struct mpcp_reg_req_t *reg_req;
 141         const struct mpcp_reg_t *reg;
 142         const struct mpcp_reg_ack_t *reg_ack;
 143     } mpcp;
 144
 145
 146     const u_char *tptr;
 147     u_int16_t opcode;
 148     u_int8_t grant_numbers, grant;
 149     u_int8_t queue_sets, queue_set, report_bitmap, report;
 150
 151     tptr=pptr;
 152     mpcp.common_header = (const struct mpcp_common_header_t *)pptr;
 153
 154     if (!TTEST2(*tptr, sizeof(const struct mpcp_common_header_t)))
 155         goto trunc;
 156     opcode = EXTRACT_16BITS(mpcp.common_header->opcode);
 157     printf("MPCP, Opcode %s", tok2str(mpcp_opcode_values, "Unknown (%u)", opcode));
 158     if (opcode != MPCP_OPCODE_PAUSE) {
 159         printf(", Timestamp %u ticks", EXTRACT_32BITS(mpcp.common_header->timestamp));
 160     }
 161     printf(", length %u", length);
 162
 163     if (!vflag)
 164         return;
 165
 166     tptr += sizeof(const struct mpcp_common_header_t);
 167
 168     switch (opcode) {
 169     case MPCP_OPCODE_PAUSE:
 170         break;
 171
 172     case MPCP_OPCODE_GATE:
 173         if (!TTEST2(*tptr, MPCP_GRANT_NUMBER_LEN))
 174             goto trunc;
 175         grant_numbers = *tptr & MPCP_GRANT_NUMBER_MASK;
 176         printf("\n\tGrant Numbers %u, Flags [ %s ]",
 177                grant_numbers,
 178                bittok2str(mpcp_grant_flag_values,
 179                           "?",
 180                           *tptr &~ MPCP_GRANT_NUMBER_MASK));
 181         tptr++;
 182
 183         for (grant = 1; grant <= grant_numbers; grant++) {
 184             if (!TTEST2(*tptr, sizeof(const struct mpcp_grant_t)))
 185                 goto trunc;
 186             mpcp.grant = (const struct mpcp_grant_t *)tptr;
 187             printf("\n\tGrant #%u, Start-Time %u ticks, duration %u ticks",
 188                    grant,
 189                    EXTRACT_32BITS(mpcp.grant->starttime),
 190                    EXTRACT_16BITS(mpcp.grant->duration));
 191             tptr += sizeof(const struct mpcp_grant_t);
 192         }
 193
 194         if (!TTEST2(*tptr, MPCP_TIMESTAMP_DURATION_LEN))
 195             goto trunc;
 196         printf("\n\tSync-Time %u ticks", EXTRACT_16BITS(tptr));
 197         break;
 198
 199
 200     case MPCP_OPCODE_REPORT:
 201         if (!TTEST2(*tptr, MPCP_REPORT_QUEUESETS_LEN))
 202             goto trunc;
 203         queue_sets = *tptr;
 204         tptr+=MPCP_REPORT_QUEUESETS_LEN;
 205         printf("\n\tTotal Queue-Sets %u", queue_sets);
 206
 207         for (queue_set = 1; queue_set < queue_sets; queue_set++) {
 208             if (!TTEST2(*tptr, MPCP_REPORT_REPORTBITMAP_LEN))
 209                 goto trunc;
 210             report_bitmap = *(tptr);
 211             printf("\n\t  Queue-Set #%u, Report-Bitmap [ %s ]",
 212                    queue_sets,
 213                    bittok2str(mpcp_report_bitmap_values, "Unknown", report_bitmap));
 214             tptr++;
 215
 216             report=1;
 217             while (report_bitmap != 0) {
 218                 if (report_bitmap & 1) {
 219                     if (!TTEST2(*tptr, MPCP_TIMESTAMP_DURATION_LEN))
 220                         goto trunc;
 221                     printf("\n\t    Q%u Report, Duration %u ticks",
 222                            report,
 223                            EXTRACT_16BITS(tptr));
 224                     tptr+=MPCP_TIMESTAMP_DURATION_LEN;
 225                 }
 226                 report++;
 227                 report_bitmap = report_bitmap >> 1;
 228             }
 229         }
 230         break;
 231
 232     case MPCP_OPCODE_REG_REQ:
 233         if (!TTEST2(*tptr, sizeof(const struct mpcp_reg_req_t)))
 234             goto trunc;
 235         mpcp.reg_req = (const struct mpcp_reg_req_t *)tptr;
 236         printf("\n\tFlags [ %s ], Pending-Grants %u",
 237                bittok2str(mpcp_reg_req_flag_values, "Reserved", mpcp.reg_req->flags),
 238                mpcp.reg_req->pending_grants);
 239         break;
 240
 241     case MPCP_OPCODE_REG:
 242         if (!TTEST2(*tptr, sizeof(const struct mpcp_reg_t)))
 243             goto trunc;
 244         mpcp.reg = (const struct mpcp_reg_t *)tptr;
 245         printf("\n\tAssigned-Port %u, Flags [ %s ]" \
 246                "\n\tSync-Time %u ticks, Echoed-Pending-Grants %u",
 247                EXTRACT_16BITS(mpcp.reg->assigned_port),
 248                bittok2str(mpcp_reg_flag_values, "Reserved", mpcp.reg->flags),
 249                EXTRACT_16BITS(mpcp.reg->sync_time),
 250                mpcp.reg->echoed_pending_grants);
 251         break;
 252
 253     case MPCP_OPCODE_REG_ACK:
 254         if (!TTEST2(*tptr, sizeof(const struct mpcp_reg_ack_t)))
 255             goto trunc;
 256         mpcp.reg_ack = (const struct mpcp_reg_ack_t *)tptr;
 257         printf("\n\tEchoed-Assigned-Port %u, Flags [ %s ]" \
 258                "\n\tEchoed-Sync-Time %u ticks",
 259                EXTRACT_16BITS(mpcp.reg_ack->echoed_assigned_port),
 260                bittok2str(mpcp_reg_ack_flag_values, "Reserved", mpcp.reg_ack->flags),
 261                EXTRACT_16BITS(mpcp.reg_ack->echoed_sync_time));
 262         break;
 263
 264     default:
 265         /* unknown opcode - hexdump for now */
 266         print_unknown_data(gndo,pptr, "\n\t", length);
 267         break;
 268     }
 269
 270     return;
 271
 272 trunc:
 273     printf("\n\t[|MPCP]");
 274 }
 275 /*
 276  * Local Variables:
 277  * c-style: whitesmith
 278  * c-basic-offset: 8
 279  * End:
 280  */