contrib/tcpdump/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 #define MPCP_TIMESTAMP_LEN        4
  30 #define MPCP_TIMESTAMP_DURATION_LEN 2
  31
  32 struct mpcp_common_header_t {
  33     uint8_t opcode[2];
  34     uint8_t timestamp[MPCP_TIMESTAMP_LEN];
  35 };
  36
  37 #define MPCP_OPCODE_PAUSE   0x0001
  38 #define MPCP_OPCODE_GATE    0x0002
  39 #define MPCP_OPCODE_REPORT  0x0003
  40 #define MPCP_OPCODE_REG_REQ 0x0004
  41 #define MPCP_OPCODE_REG     0x0005
  42 #define MPCP_OPCODE_REG_ACK 0x0006
  43
  44 static const struct tok mpcp_opcode_values[] = {
  45     { MPCP_OPCODE_PAUSE, "Pause" },
  46     { MPCP_OPCODE_GATE, "Gate" },
  47     { MPCP_OPCODE_REPORT, "Report" },
  48     { MPCP_OPCODE_REG_REQ, "Register Request" },
  49     { MPCP_OPCODE_REG, "Register" },
  50     { MPCP_OPCODE_REG_ACK, "Register ACK" },
  51     { 0, NULL}
  52 };
  53
  54 #define MPCP_GRANT_NUMBER_LEN 1
  55 #define MPCP_GRANT_NUMBER_MASK 0x7
  56 static const struct tok mpcp_grant_flag_values[] = {
  57     { 0x08, "Discovery" },
  58     { 0x10, "Force Grant #1" },
  59     { 0x20, "Force Grant #2" },
  60     { 0x40, "Force Grant #3" },
  61     { 0x80, "Force Grant #4" },
  62     { 0, NULL}
  63 };
  64
  65 struct mpcp_grant_t {
  66     uint8_t starttime[MPCP_TIMESTAMP_LEN];
  67     uint8_t duration[MPCP_TIMESTAMP_DURATION_LEN];
  68 };
  69
  70 struct mpcp_reg_req_t {
  71     uint8_t flags;
  72     uint8_t pending_grants;
  73 };
  74
  75
  76 static const struct tok mpcp_reg_req_flag_values[] = {
  77     { 1, "Register" },
  78     { 3, "De-Register" },
  79     { 0, NULL}
  80 };
  81
  82 struct mpcp_reg_t {
  83     uint8_t assigned_port[2];
  84     uint8_t flags;
  85     uint8_t sync_time[MPCP_TIMESTAMP_DURATION_LEN];
  86     uint8_t echoed_pending_grants;
  87 };
  88
  89 static const struct tok mpcp_reg_flag_values[] = {
  90     { 1, "Re-Register" },
  91     { 2, "De-Register" },
  92     { 3, "ACK" },
  93     { 4, "NACK" },
  94     { 0, NULL}
  95 };
  96
  97 #define MPCP_REPORT_QUEUESETS_LEN    1
  98 #define MPCP_REPORT_REPORTBITMAP_LEN 1
  99 static const struct tok mpcp_report_bitmap_values[] = {
 100     { 0x01, "Q0" },
 101     { 0x02, "Q1" },
 102     { 0x04, "Q2" },
 103     { 0x08, "Q3" },
 104     { 0x10, "Q4" },
 105     { 0x20, "Q5" },
 106     { 0x40, "Q6" },
 107     { 0x80, "Q7" },
 108     { 0, NULL}
 109 };
 110
 111 struct mpcp_reg_ack_t {
 112     uint8_t flags;
 113     uint8_t echoed_assigned_port[2];
 114     uint8_t echoed_sync_time[MPCP_TIMESTAMP_DURATION_LEN];
 115 };
 116
 117 static const struct tok mpcp_reg_ack_flag_values[] = {
 118     { 0, "NACK" },
 119     { 1, "ACK" },
 120     { 0, NULL}
 121 };
 122
 123 void
 124 mpcp_print(netdissect_options *ndo, register const u_char *pptr, register u_int length)
 125 {
 126     union {
 127         const struct mpcp_common_header_t *common_header;
 128         const struct mpcp_grant_t *grant;
 129         const struct mpcp_reg_req_t *reg_req;
 130         const struct mpcp_reg_t *reg;
 131         const struct mpcp_reg_ack_t *reg_ack;
 132     } mpcp;
 133
 134
 135     const u_char *tptr;
 136     uint16_t opcode;
 137     uint8_t grant_numbers, grant;
 138     uint8_t queue_sets, queue_set, report_bitmap, report;
 139
 140     tptr=pptr;
 141     mpcp.common_header = (const struct mpcp_common_header_t *)pptr;
 142
 143     ND_TCHECK2(*tptr, sizeof(const struct mpcp_common_header_t));
 144     opcode = EXTRACT_16BITS(mpcp.common_header->opcode);
 145     ND_PRINT((ndo, "MPCP, Opcode %s", tok2str(mpcp_opcode_values, "Unknown (%u)", opcode)));
 146     if (opcode != MPCP_OPCODE_PAUSE) {
 147         ND_PRINT((ndo, ", Timestamp %u ticks", EXTRACT_32BITS(mpcp.common_header->timestamp)));
 148     }
 149     ND_PRINT((ndo, ", length %u", length));
 150
 151     if (!ndo->ndo_vflag)
 152         return;
 153
 154     tptr += sizeof(const struct mpcp_common_header_t);
 155
 156     switch (opcode) {
 157     case MPCP_OPCODE_PAUSE:
 158         break;
 159
 160     case MPCP_OPCODE_GATE:
 161         ND_TCHECK2(*tptr, MPCP_GRANT_NUMBER_LEN);
 162         grant_numbers = *tptr & MPCP_GRANT_NUMBER_MASK;
 163         ND_PRINT((ndo, "\n\tGrant Numbers %u, Flags [ %s ]",
 164                grant_numbers,
 165                bittok2str(mpcp_grant_flag_values,
 166                           "?",
 167                           *tptr &~ MPCP_GRANT_NUMBER_MASK)));
 168         tptr++;
 169
 170         for (grant = 1; grant <= grant_numbers; grant++) {
 171             ND_TCHECK2(*tptr, sizeof(const struct mpcp_grant_t));
 172             mpcp.grant = (const struct mpcp_grant_t *)tptr;
 173             ND_PRINT((ndo, "\n\tGrant #%u, Start-Time %u ticks, duration %u ticks",
 174                    grant,
 175                    EXTRACT_32BITS(mpcp.grant->starttime),
 176                    EXTRACT_16BITS(mpcp.grant->duration)));
 177             tptr += sizeof(const struct mpcp_grant_t);
 178         }
 179
 180         ND_TCHECK2(*tptr, MPCP_TIMESTAMP_DURATION_LEN);
 181         ND_PRINT((ndo, "\n\tSync-Time %u ticks", EXTRACT_16BITS(tptr)));
 182         break;
 183
 184
 185     case MPCP_OPCODE_REPORT:
 186         ND_TCHECK2(*tptr, MPCP_REPORT_QUEUESETS_LEN);
 187         queue_sets = *tptr;
 188         tptr+=MPCP_REPORT_QUEUESETS_LEN;
 189         ND_PRINT((ndo, "\n\tTotal Queue-Sets %u", queue_sets));
 190
 191         for (queue_set = 1; queue_set < queue_sets; queue_set++) {
 192             ND_TCHECK2(*tptr, MPCP_REPORT_REPORTBITMAP_LEN);
 193             report_bitmap = *(tptr);
 194             ND_PRINT((ndo, "\n\t  Queue-Set #%u, Report-Bitmap [ %s ]",
 195                    queue_sets,
 196                    bittok2str(mpcp_report_bitmap_values, "Unknown", report_bitmap)));
 197             tptr++;
 198
 199             report=1;
 200             while (report_bitmap != 0) {
 201                 if (report_bitmap & 1) {
 202                     ND_TCHECK2(*tptr, MPCP_TIMESTAMP_DURATION_LEN);
 203                     ND_PRINT((ndo, "\n\t    Q%u Report, Duration %u ticks",
 204                            report,
 205                            EXTRACT_16BITS(tptr)));
 206                     tptr+=MPCP_TIMESTAMP_DURATION_LEN;
 207                 }
 208                 report++;
 209                 report_bitmap = report_bitmap >> 1;
 210             }
 211         }
 212         break;
 213
 214     case MPCP_OPCODE_REG_REQ:
 215         ND_TCHECK2(*tptr, sizeof(const struct mpcp_reg_req_t));
 216         mpcp.reg_req = (const struct mpcp_reg_req_t *)tptr;
 217         ND_PRINT((ndo, "\n\tFlags [ %s ], Pending-Grants %u",
 218                bittok2str(mpcp_reg_req_flag_values, "Reserved", mpcp.reg_req->flags),
 219                mpcp.reg_req->pending_grants));
 220         break;
 221
 222     case MPCP_OPCODE_REG:
 223         ND_TCHECK2(*tptr, sizeof(const struct mpcp_reg_t));
 224         mpcp.reg = (const struct mpcp_reg_t *)tptr;
 225         ND_PRINT((ndo, "\n\tAssigned-Port %u, Flags [ %s ]" \
 226                "\n\tSync-Time %u ticks, Echoed-Pending-Grants %u",
 227                EXTRACT_16BITS(mpcp.reg->assigned_port),
 228                bittok2str(mpcp_reg_flag_values, "Reserved", mpcp.reg->flags),
 229                EXTRACT_16BITS(mpcp.reg->sync_time),
 230                mpcp.reg->echoed_pending_grants));
 231         break;
 232
 233     case MPCP_OPCODE_REG_ACK:
 234         ND_TCHECK2(*tptr, sizeof(const struct mpcp_reg_ack_t));
 235         mpcp.reg_ack = (const struct mpcp_reg_ack_t *)tptr;
 236         ND_PRINT((ndo, "\n\tEchoed-Assigned-Port %u, Flags [ %s ]" \
 237                "\n\tEchoed-Sync-Time %u ticks",
 238                EXTRACT_16BITS(mpcp.reg_ack->echoed_assigned_port),
 239                bittok2str(mpcp_reg_ack_flag_values, "Reserved", mpcp.reg_ack->flags),
 240                EXTRACT_16BITS(mpcp.reg_ack->echoed_sync_time)));
 241         break;
 242
 243     default:
 244         /* unknown opcode - hexdump for now */
 245         print_unknown_data(ndo,pptr, "\n\t", length);
 246         break;
 247     }
 248
 249     return;
 250
 251 trunc:
 252     ND_PRINT((ndo, "\n\t[|MPCP]"));
 253 }
 254 /*
 255  * Local Variables:
 256  * c-style: whitesmith
 257  * c-basic-offset: 8
 258  * End:
 259  */