261 lines
7.9 KiB
C
261 lines
7.9 KiB
C
/*
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* Copyright (c) 1998-2006 The TCPDUMP project
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that: (1) source code
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* distributions retain the above copyright notice and this paragraph
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* in its entirety, and (2) distributions including binary code include
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* the above copyright notice and this paragraph in its entirety in
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* the documentation or other materials provided with the distribution.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND
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* WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT
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* LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE.
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*
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* support for the IEEE MPCP protocol as per 802.3ah
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*
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* Original code by Hannes Gredler (hannes@juniper.net)
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*/
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#define NETDISSECT_REWORKED
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <tcpdump-stdinc.h>
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#include "interface.h"
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#include "extract.h"
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#define MPCP_TIMESTAMP_LEN 4
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#define MPCP_TIMESTAMP_DURATION_LEN 2
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struct mpcp_common_header_t {
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uint8_t opcode[2];
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uint8_t timestamp[MPCP_TIMESTAMP_LEN];
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};
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#define MPCP_OPCODE_PAUSE 0x0001
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#define MPCP_OPCODE_GATE 0x0002
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#define MPCP_OPCODE_REPORT 0x0003
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#define MPCP_OPCODE_REG_REQ 0x0004
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#define MPCP_OPCODE_REG 0x0005
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#define MPCP_OPCODE_REG_ACK 0x0006
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static const struct tok mpcp_opcode_values[] = {
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{ MPCP_OPCODE_PAUSE, "Pause" },
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{ MPCP_OPCODE_GATE, "Gate" },
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{ MPCP_OPCODE_REPORT, "Report" },
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{ MPCP_OPCODE_REG_REQ, "Register Request" },
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{ MPCP_OPCODE_REG, "Register" },
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{ MPCP_OPCODE_REG_ACK, "Register ACK" },
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{ 0, NULL}
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};
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#define MPCP_GRANT_NUMBER_LEN 1
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#define MPCP_GRANT_NUMBER_MASK 0x7
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static const struct tok mpcp_grant_flag_values[] = {
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{ 0x08, "Discovery" },
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{ 0x10, "Force Grant #1" },
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{ 0x20, "Force Grant #2" },
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{ 0x40, "Force Grant #3" },
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{ 0x80, "Force Grant #4" },
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{ 0, NULL}
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};
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struct mpcp_grant_t {
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uint8_t starttime[MPCP_TIMESTAMP_LEN];
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uint8_t duration[MPCP_TIMESTAMP_DURATION_LEN];
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};
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struct mpcp_reg_req_t {
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uint8_t flags;
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uint8_t pending_grants;
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};
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static const struct tok mpcp_reg_req_flag_values[] = {
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{ 1, "Register" },
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{ 3, "De-Register" },
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{ 0, NULL}
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};
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struct mpcp_reg_t {
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uint8_t assigned_port[2];
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uint8_t flags;
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uint8_t sync_time[MPCP_TIMESTAMP_DURATION_LEN];
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uint8_t echoed_pending_grants;
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};
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static const struct tok mpcp_reg_flag_values[] = {
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{ 1, "Re-Register" },
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{ 2, "De-Register" },
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{ 3, "ACK" },
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{ 4, "NACK" },
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{ 0, NULL}
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};
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#define MPCP_REPORT_QUEUESETS_LEN 1
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#define MPCP_REPORT_REPORTBITMAP_LEN 1
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static const struct tok mpcp_report_bitmap_values[] = {
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{ 0x01, "Q0" },
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{ 0x02, "Q1" },
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{ 0x04, "Q2" },
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{ 0x08, "Q3" },
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{ 0x10, "Q4" },
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{ 0x20, "Q5" },
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{ 0x40, "Q6" },
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{ 0x80, "Q7" },
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{ 0, NULL}
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};
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struct mpcp_reg_ack_t {
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uint8_t flags;
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uint8_t echoed_assigned_port[2];
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uint8_t echoed_sync_time[MPCP_TIMESTAMP_DURATION_LEN];
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};
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static const struct tok mpcp_reg_ack_flag_values[] = {
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{ 0, "NACK" },
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{ 1, "ACK" },
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{ 0, NULL}
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};
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void
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mpcp_print(netdissect_options *ndo, register const u_char *pptr, register u_int length) {
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union {
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const struct mpcp_common_header_t *common_header;
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const struct mpcp_grant_t *grant;
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const struct mpcp_reg_req_t *reg_req;
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const struct mpcp_reg_t *reg;
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const struct mpcp_reg_ack_t *reg_ack;
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} mpcp;
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const u_char *tptr;
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uint16_t opcode;
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uint8_t grant_numbers, grant;
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uint8_t queue_sets, queue_set, report_bitmap, report;
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tptr=pptr;
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mpcp.common_header = (const struct mpcp_common_header_t *)pptr;
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ND_TCHECK2(*tptr, sizeof(const struct mpcp_common_header_t));
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opcode = EXTRACT_16BITS(mpcp.common_header->opcode);
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ND_PRINT((ndo, "MPCP, Opcode %s", tok2str(mpcp_opcode_values, "Unknown (%u)", opcode)));
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if (opcode != MPCP_OPCODE_PAUSE) {
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ND_PRINT((ndo, ", Timestamp %u ticks", EXTRACT_32BITS(mpcp.common_header->timestamp)));
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}
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ND_PRINT((ndo, ", length %u", length));
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if (!ndo->ndo_vflag)
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return;
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tptr += sizeof(const struct mpcp_common_header_t);
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switch (opcode) {
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case MPCP_OPCODE_PAUSE:
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break;
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case MPCP_OPCODE_GATE:
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ND_TCHECK2(*tptr, MPCP_GRANT_NUMBER_LEN);
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grant_numbers = *tptr & MPCP_GRANT_NUMBER_MASK;
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ND_PRINT((ndo, "\n\tGrant Numbers %u, Flags [ %s ]",
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grant_numbers,
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bittok2str(mpcp_grant_flag_values,
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"?",
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*tptr &~ MPCP_GRANT_NUMBER_MASK)));
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tptr++;
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for (grant = 1; grant <= grant_numbers; grant++) {
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ND_TCHECK2(*tptr, sizeof(const struct mpcp_grant_t));
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mpcp.grant = (const struct mpcp_grant_t *)tptr;
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ND_PRINT((ndo, "\n\tGrant #%u, Start-Time %u ticks, duration %u ticks",
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grant,
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EXTRACT_32BITS(mpcp.grant->starttime),
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EXTRACT_16BITS(mpcp.grant->duration)));
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tptr += sizeof(const struct mpcp_grant_t);
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}
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ND_TCHECK2(*tptr, MPCP_TIMESTAMP_DURATION_LEN);
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ND_PRINT((ndo, "\n\tSync-Time %u ticks", EXTRACT_16BITS(tptr)));
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break;
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case MPCP_OPCODE_REPORT:
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ND_TCHECK2(*tptr, MPCP_REPORT_QUEUESETS_LEN);
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queue_sets = *tptr;
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tptr+=MPCP_REPORT_QUEUESETS_LEN;
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ND_PRINT((ndo, "\n\tTotal Queue-Sets %u", queue_sets));
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for (queue_set = 1; queue_set < queue_sets; queue_set++) {
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ND_TCHECK2(*tptr, MPCP_REPORT_REPORTBITMAP_LEN);
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report_bitmap = *(tptr);
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ND_PRINT((ndo, "\n\t Queue-Set #%u, Report-Bitmap [ %s ]",
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queue_sets,
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bittok2str(mpcp_report_bitmap_values, "Unknown", report_bitmap)));
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tptr++;
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report=1;
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while (report_bitmap != 0) {
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if (report_bitmap & 1) {
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ND_TCHECK2(*tptr, MPCP_TIMESTAMP_DURATION_LEN);
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ND_PRINT((ndo, "\n\t Q%u Report, Duration %u ticks",
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report,
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EXTRACT_16BITS(tptr)));
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tptr+=MPCP_TIMESTAMP_DURATION_LEN;
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}
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report++;
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report_bitmap = report_bitmap >> 1;
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}
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}
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break;
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case MPCP_OPCODE_REG_REQ:
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ND_TCHECK2(*tptr, sizeof(const struct mpcp_reg_req_t));
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mpcp.reg_req = (const struct mpcp_reg_req_t *)tptr;
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ND_PRINT((ndo, "\n\tFlags [ %s ], Pending-Grants %u",
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bittok2str(mpcp_reg_req_flag_values, "Reserved", mpcp.reg_req->flags),
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mpcp.reg_req->pending_grants));
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break;
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case MPCP_OPCODE_REG:
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ND_TCHECK2(*tptr, sizeof(const struct mpcp_reg_t));
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mpcp.reg = (const struct mpcp_reg_t *)tptr;
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ND_PRINT((ndo, "\n\tAssigned-Port %u, Flags [ %s ]" \
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"\n\tSync-Time %u ticks, Echoed-Pending-Grants %u",
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EXTRACT_16BITS(mpcp.reg->assigned_port),
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bittok2str(mpcp_reg_flag_values, "Reserved", mpcp.reg->flags),
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EXTRACT_16BITS(mpcp.reg->sync_time),
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mpcp.reg->echoed_pending_grants));
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break;
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case MPCP_OPCODE_REG_ACK:
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ND_TCHECK2(*tptr, sizeof(const struct mpcp_reg_ack_t));
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mpcp.reg_ack = (const struct mpcp_reg_ack_t *)tptr;
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ND_PRINT((ndo, "\n\tEchoed-Assigned-Port %u, Flags [ %s ]" \
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"\n\tEchoed-Sync-Time %u ticks",
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EXTRACT_16BITS(mpcp.reg_ack->echoed_assigned_port),
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bittok2str(mpcp_reg_ack_flag_values, "Reserved", mpcp.reg_ack->flags),
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EXTRACT_16BITS(mpcp.reg_ack->echoed_sync_time)));
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break;
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default:
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/* unknown opcode - hexdump for now */
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print_unknown_data(ndo,pptr, "\n\t", length);
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break;
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}
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return;
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trunc:
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ND_PRINT((ndo, "\n\t[|MPCP]"));
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}
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/*
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* Local Variables:
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* c-style: whitesmith
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* c-basic-offset: 8
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* End:
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*/
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