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 #define NETDISSECT_REWORKED
  21 #ifdef HAVE_CONFIG_H
  22 #include "config.h"
  23 #endif
  24
  25 #include <tcpdump-stdinc.h>
  26
  27 #include "interface.h"
  28 #include "extract.h"
  29
  30 #define MPCP_TIMESTAMP_LEN        4
  31 #define MPCP_TIMESTAMP_DURATION_LEN 2
  32
  33 struct mpcp_common_header_t {
  34     u_int8_t opcode[2];
  35     u_int8_t timestamp[MPCP_TIMESTAMP_LEN];
  36 };
  37
  38 #define MPCP_OPCODE_PAUSE   0x0001
  39 #define MPCP_OPCODE_GATE    0x0002
  40 #define MPCP_OPCODE_REPORT  0x0003
  41 #define MPCP_OPCODE_REG_REQ 0x0004
  42 #define MPCP_OPCODE_REG     0x0005
  43 #define MPCP_OPCODE_REG_ACK 0x0006
  44
  45 static const struct tok mpcp_opcode_values[] = {
  46     { MPCP_OPCODE_PAUSE, "Pause" },
  47     { MPCP_OPCODE_GATE, "Gate" },
  48     { MPCP_OPCODE_REPORT, "Report" },
  49     { MPCP_OPCODE_REG_REQ, "Register Request" },
  50     { MPCP_OPCODE_REG, "Register" },
  51     { MPCP_OPCODE_REG_ACK, "Register ACK" },
  52     { 0, NULL}
  53 };
  54
  55 #define MPCP_GRANT_NUMBER_LEN 1
  56 #define MPCP_GRANT_NUMBER_MASK 0x7
  57 static const struct tok mpcp_grant_flag_values[] = {
  58     { 0x08, "Discovery" },
  59     { 0x10, "Force Grant #1" },
  60     { 0x20, "Force Grant #2" },
  61     { 0x40, "Force Grant #3" },
  62     { 0x80, "Force Grant #4" },
  63     { 0, NULL}
  64 };
  65
  66 struct mpcp_grant_t {
  67     u_int8_t starttime[MPCP_TIMESTAMP_LEN];
  68     u_int8_t duration[MPCP_TIMESTAMP_DURATION_LEN];
  69 };
  70
  71 struct mpcp_reg_req_t {
  72     u_int8_t flags;
  73     u_int8_t pending_grants;
  74 };
  75
  76
  77 static const struct tok mpcp_reg_req_flag_values[] = {
  78     { 1, "Register" },
  79     { 3, "De-Register" },
  80     { 0, NULL}
  81 };
  82
  83 struct mpcp_reg_t {
  84     u_int8_t assigned_port[2];
  85     u_int8_t flags;
  86     u_int8_t sync_time[MPCP_TIMESTAMP_DURATION_LEN];
  87     u_int8_t echoed_pending_grants;
  88 };
  89
  90 static const struct tok mpcp_reg_flag_values[] = {
  91     { 1, "Re-Register" },
  92     { 2, "De-Register" },
  93     { 3, "ACK" },
  94     { 4, "NACK" },
  95     { 0, NULL}
  96 };
  97
  98 #define MPCP_REPORT_QUEUESETS_LEN    1
  99 #define MPCP_REPORT_REPORTBITMAP_LEN 1
 100 static const struct tok mpcp_report_bitmap_values[] = {
 101     { 0x01, "Q0" },
 102     { 0x02, "Q1" },
 103     { 0x04, "Q2" },
 104     { 0x08, "Q3" },
 105     { 0x10, "Q4" },
 106     { 0x20, "Q5" },
 107     { 0x40, "Q6" },
 108     { 0x80, "Q7" },
 109     { 0, NULL}
 110 };
 111
 112 struct mpcp_reg_ack_t {
 113     u_int8_t flags;
 114     u_int8_t echoed_assigned_port[2];
 115     u_int8_t echoed_sync_time[MPCP_TIMESTAMP_DURATION_LEN];
 116 };
 117
 118 static const struct tok mpcp_reg_ack_flag_values[] = {
 119     { 0, "NACK" },
 120     { 1, "ACK" },
 121     { 0, NULL}
 122 };
 123
 124 void
 125 mpcp_print(netdissect_options *ndo, register const u_char *pptr, register u_int length) {
 126
 127     union {
 128         const struct mpcp_common_header_t *common_header;
 129         const struct mpcp_grant_t *grant;
 130         const struct mpcp_reg_req_t *reg_req;
 131         const struct mpcp_reg_t *reg;
 132         const struct mpcp_reg_ack_t *reg_ack;
 133     } mpcp;
 134
 135
 136     const u_char *tptr;
 137     u_int16_t opcode;
 138     u_int8_t grant_numbers, grant;
 139     u_int8_t queue_sets, queue_set, report_bitmap, report;
 140
 141     tptr=pptr;
 142     mpcp.common_header = (const struct mpcp_common_header_t *)pptr;
 143
 144     if (!ND_TTEST2(*tptr, sizeof(const struct mpcp_common_header_t)))
 145         goto trunc;
 146     opcode = EXTRACT_16BITS(mpcp.common_header->opcode);
 147     ND_PRINT((ndo, "MPCP, Opcode %s", tok2str(mpcp_opcode_values, "Unknown (%u)", opcode)));
 148     if (opcode != MPCP_OPCODE_PAUSE) {
 149         ND_PRINT((ndo, ", Timestamp %u ticks", EXTRACT_32BITS(mpcp.common_header->timestamp)));
 150     }
 151     ND_PRINT((ndo, ", length %u", length));
 152
 153     if (!ndo->ndo_vflag)
 154         return;
 155
 156     tptr += sizeof(const struct mpcp_common_header_t);
 157
 158     switch (opcode) {
 159     case MPCP_OPCODE_PAUSE:
 160         break;
 161
 162     case MPCP_OPCODE_GATE:
 163         if (!ND_TTEST2(*tptr, MPCP_GRANT_NUMBER_LEN))
 164             goto trunc;
 165         grant_numbers = *tptr & MPCP_GRANT_NUMBER_MASK;
 166         ND_PRINT((ndo, "\n\tGrant Numbers %u, Flags [ %s ]",
 167                grant_numbers,
 168                bittok2str(mpcp_grant_flag_values,
 169                           "?",
 170                           *tptr &~ MPCP_GRANT_NUMBER_MASK)));
 171         tptr++;
 172
 173         for (grant = 1; grant <= grant_numbers; grant++) {
 174             if (!ND_TTEST2(*tptr, sizeof(const struct mpcp_grant_t)))
 175                 goto trunc;
 176             mpcp.grant = (const struct mpcp_grant_t *)tptr;
 177             ND_PRINT((ndo, "\n\tGrant #%u, Start-Time %u ticks, duration %u ticks",
 178                    grant,
 179                    EXTRACT_32BITS(mpcp.grant->starttime),
 180                    EXTRACT_16BITS(mpcp.grant->duration)));
 181             tptr += sizeof(const struct mpcp_grant_t);
 182         }
 183
 184         if (!ND_TTEST2(*tptr, MPCP_TIMESTAMP_DURATION_LEN))
 185             goto trunc;
 186         ND_PRINT((ndo, "\n\tSync-Time %u ticks", EXTRACT_16BITS(tptr)));
 187         break;
 188
 189
 190     case MPCP_OPCODE_REPORT:
 191         if (!ND_TTEST2(*tptr, MPCP_REPORT_QUEUESETS_LEN))
 192             goto trunc;
 193         queue_sets = *tptr;
 194         tptr+=MPCP_REPORT_QUEUESETS_LEN;
 195         ND_PRINT((ndo, "\n\tTotal Queue-Sets %u", queue_sets));
 196
 197         for (queue_set = 1; queue_set < queue_sets; queue_set++) {
 198             if (!ND_TTEST2(*tptr, MPCP_REPORT_REPORTBITMAP_LEN))
 199                 goto trunc;
 200             report_bitmap = *(tptr);
 201             ND_PRINT((ndo, "\n\t  Queue-Set #%u, Report-Bitmap [ %s ]",
 202                    queue_sets,
 203                    bittok2str(mpcp_report_bitmap_values, "Unknown", report_bitmap)));
 204             tptr++;
 205
 206             report=1;
 207             while (report_bitmap != 0) {
 208                 if (report_bitmap & 1) {
 209                     if (!ND_TTEST2(*tptr, MPCP_TIMESTAMP_DURATION_LEN))
 210                         goto trunc;
 211                     ND_PRINT((ndo, "\n\t    Q%u Report, Duration %u ticks",
 212                            report,
 213                            EXTRACT_16BITS(tptr)));
 214                     tptr+=MPCP_TIMESTAMP_DURATION_LEN;
 215                 }
 216                 report++;
 217                 report_bitmap = report_bitmap >> 1;
 218             }
 219         }
 220         break;
 221
 222     case MPCP_OPCODE_REG_REQ:
 223         if (!ND_TTEST2(*tptr, sizeof(const struct mpcp_reg_req_t)))
 224             goto trunc;
 225         mpcp.reg_req = (const struct mpcp_reg_req_t *)tptr;
 226         ND_PRINT((ndo, "\n\tFlags [ %s ], Pending-Grants %u",
 227                bittok2str(mpcp_reg_req_flag_values, "Reserved", mpcp.reg_req->flags),
 228                mpcp.reg_req->pending_grants));
 229         break;
 230
 231     case MPCP_OPCODE_REG:
 232         if (!ND_TTEST2(*tptr, sizeof(const struct mpcp_reg_t)))
 233             goto trunc;
 234         mpcp.reg = (const struct mpcp_reg_t *)tptr;
 235         ND_PRINT((ndo, "\n\tAssigned-Port %u, Flags [ %s ]" \
 236                "\n\tSync-Time %u ticks, Echoed-Pending-Grants %u",
 237                EXTRACT_16BITS(mpcp.reg->assigned_port),
 238                bittok2str(mpcp_reg_flag_values, "Reserved", mpcp.reg->flags),
 239                EXTRACT_16BITS(mpcp.reg->sync_time),
 240                mpcp.reg->echoed_pending_grants));
 241         break;
 242
 243     case MPCP_OPCODE_REG_ACK:
 244         if (!ND_TTEST2(*tptr, sizeof(const struct mpcp_reg_ack_t)))
 245             goto trunc;
 246         mpcp.reg_ack = (const struct mpcp_reg_ack_t *)tptr;
 247         ND_PRINT((ndo, "\n\tEchoed-Assigned-Port %u, Flags [ %s ]" \
 248                "\n\tEchoed-Sync-Time %u ticks",
 249                EXTRACT_16BITS(mpcp.reg_ack->echoed_assigned_port),
 250                bittok2str(mpcp_reg_ack_flag_values, "Reserved", mpcp.reg_ack->flags),
 251                EXTRACT_16BITS(mpcp.reg_ack->echoed_sync_time)));
 252         break;
 253
 254     default:
 255         /* unknown opcode - hexdump for now */
 256         print_unknown_data(ndo,pptr, "\n\t", length);
 257         break;
 258     }
 259
 260     return;
 261
 262 trunc:
 263     ND_PRINT((ndo, "\n\t[|MPCP]"));
 264 }
 265 /*
 266  * Local Variables:
 267  * c-style: whitesmith
 268  * c-basic-offset: 8
 269  * End:
 270  */