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/*
* Copyright (c) 1998-2006 The TCPDUMP project
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that: (1) source code
* distributions retain the above copyright notice and this paragraph
* in its entirety, and (2) distributions including binary code include
* the above copyright notice and this paragraph in its entirety in
* the documentation or other materials provided with the distribution.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND
* WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT
* LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE.
*
* Original code by Hannes Gredler (hannes@gredler.at)
*/
/* \summary: IEEE 802.3ah Multi-Point Control Protocol (MPCP) printer */
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "netdissect-stdinc.h"
#include "netdissect.h"
#include "extract.h"
struct mpcp_common_header_t {
nd_uint16_t opcode;
nd_uint32_t timestamp;
};
#define MPCP_OPCODE_PAUSE 0x0001
#define MPCP_OPCODE_GATE 0x0002
#define MPCP_OPCODE_REPORT 0x0003
#define MPCP_OPCODE_REG_REQ 0x0004
#define MPCP_OPCODE_REG 0x0005
#define MPCP_OPCODE_REG_ACK 0x0006
static const struct tok mpcp_opcode_values[] = {
{ MPCP_OPCODE_PAUSE, "Pause" },
{ MPCP_OPCODE_GATE, "Gate" },
{ MPCP_OPCODE_REPORT, "Report" },
{ MPCP_OPCODE_REG_REQ, "Register Request" },
{ MPCP_OPCODE_REG, "Register" },
{ MPCP_OPCODE_REG_ACK, "Register ACK" },
{ 0, NULL}
};
#define MPCP_GRANT_NUMBER_LEN 1
#define MPCP_GRANT_NUMBER_MASK 0x7
static const struct tok mpcp_grant_flag_values[] = {
{ 0x08, "Discovery" },
{ 0x10, "Force Grant #1" },
{ 0x20, "Force Grant #2" },
{ 0x40, "Force Grant #3" },
{ 0x80, "Force Grant #4" },
{ 0, NULL}
};
struct mpcp_grant_t {
nd_uint32_t starttime;
nd_uint16_t duration;
};
struct mpcp_reg_req_t {
nd_uint8_t flags;
nd_uint8_t pending_grants;
};
static const struct tok mpcp_reg_req_flag_values[] = {
{ 1, "Register" },
{ 3, "De-Register" },
{ 0, NULL}
};
struct mpcp_reg_t {
nd_uint16_t assigned_port;
nd_uint8_t flags;
nd_uint16_t sync_time;
nd_uint8_t echoed_pending_grants;
};
static const struct tok mpcp_reg_flag_values[] = {
{ 1, "Re-Register" },
{ 2, "De-Register" },
{ 3, "ACK" },
{ 4, "NACK" },
{ 0, NULL}
};
#define MPCP_REPORT_QUEUESETS_LEN 1
#define MPCP_REPORT_REPORTBITMAP_LEN 1
static const struct tok mpcp_report_bitmap_values[] = {
{ 0x01, "Q0" },
{ 0x02, "Q1" },
{ 0x04, "Q2" },
{ 0x08, "Q3" },
{ 0x10, "Q4" },
{ 0x20, "Q5" },
{ 0x40, "Q6" },
{ 0x80, "Q7" },
{ 0, NULL}
};
struct mpcp_reg_ack_t {
nd_uint8_t flags;
nd_uint16_t echoed_assigned_port;
nd_uint16_t echoed_sync_time;
};
static const struct tok mpcp_reg_ack_flag_values[] = {
{ 0, "NACK" },
{ 1, "ACK" },
{ 0, NULL}
};
void
mpcp_print(netdissect_options *ndo, const u_char *pptr, u_int length)
{
const struct mpcp_common_header_t *mpcp_common_header;
const struct mpcp_reg_req_t *mpcp_reg_req;
const struct mpcp_reg_t *mpcp_reg;
const struct mpcp_reg_ack_t *mpcp_reg_ack;
const u_char *tptr;
uint16_t opcode;
uint32_t timestamp;
uint8_t grant_numbers, grant;
uint8_t queue_sets, queue_set, report_bitmap, report;
ndo->ndo_protocol = "mpcp";
tptr=pptr;
mpcp_common_header = (const struct mpcp_common_header_t *)pptr;
opcode = GET_BE_U_2(mpcp_common_header->opcode);
timestamp = GET_BE_U_4(mpcp_common_header->timestamp);
ND_PRINT("MPCP, Opcode %s", tok2str(mpcp_opcode_values, "Unknown (%u)", opcode));
if (opcode != MPCP_OPCODE_PAUSE) {
ND_PRINT(", Timestamp %u ticks", timestamp);
}
ND_PRINT(", length %u", length);
if (!ndo->ndo_vflag)
return;
tptr += sizeof(struct mpcp_common_header_t);
switch (opcode) {
case MPCP_OPCODE_PAUSE:
break;
case MPCP_OPCODE_GATE:
grant_numbers = GET_U_1(tptr) & MPCP_GRANT_NUMBER_MASK;
ND_PRINT("\n\tGrant Numbers %u, Flags [ %s ]",
grant_numbers,
bittok2str(mpcp_grant_flag_values,
"?",
GET_U_1(tptr) & ~MPCP_GRANT_NUMBER_MASK));
tptr++;
for (grant = 1; grant <= grant_numbers; grant++) {
const struct mpcp_grant_t *mpcp_grant = (const struct mpcp_grant_t *)tptr;
ND_PRINT("\n\tGrant #%u, Start-Time %u ticks, duration %u ticks",
grant,
GET_BE_U_4(mpcp_grant->starttime),
GET_BE_U_2(mpcp_grant->duration));
tptr += sizeof(struct mpcp_grant_t);
}
ND_PRINT("\n\tSync-Time %u ticks", GET_BE_U_2(tptr));
break;
case MPCP_OPCODE_REPORT:
queue_sets = GET_U_1(tptr);
tptr+=MPCP_REPORT_QUEUESETS_LEN;
ND_PRINT("\n\tTotal Queue-Sets %u", queue_sets);
for (queue_set = 1; queue_set < queue_sets; queue_set++) {
report_bitmap = GET_U_1(tptr);
ND_PRINT("\n\t Queue-Set #%u, Report-Bitmap [ %s ]",
queue_sets,
bittok2str(mpcp_report_bitmap_values, "Unknown", report_bitmap));
tptr++;
report=1;
while (report_bitmap != 0) {
if (report_bitmap & 1) {
ND_PRINT("\n\t Q%u Report, Duration %u ticks",
report,
GET_BE_U_2(tptr));
tptr += 2;
}
report++;
report_bitmap = report_bitmap >> 1;
}
}
break;
case MPCP_OPCODE_REG_REQ:
mpcp_reg_req = (const struct mpcp_reg_req_t *)tptr;
ND_PRINT("\n\tFlags [ %s ], Pending-Grants %u",
bittok2str(mpcp_reg_req_flag_values, "Reserved", GET_U_1(mpcp_reg_req->flags)),
GET_U_1(mpcp_reg_req->pending_grants));
break;
case MPCP_OPCODE_REG:
mpcp_reg = (const struct mpcp_reg_t *)tptr;
ND_PRINT("\n\tAssigned-Port %u, Flags [ %s ]"
"\n\tSync-Time %u ticks, Echoed-Pending-Grants %u",
GET_BE_U_2(mpcp_reg->assigned_port),
bittok2str(mpcp_reg_flag_values, "Reserved", GET_U_1(mpcp_reg->flags)),
GET_BE_U_2(mpcp_reg->sync_time),
GET_U_1(mpcp_reg->echoed_pending_grants));
break;
case MPCP_OPCODE_REG_ACK:
mpcp_reg_ack = (const struct mpcp_reg_ack_t *)tptr;
ND_PRINT("\n\tEchoed-Assigned-Port %u, Flags [ %s ]"
"\n\tEchoed-Sync-Time %u ticks",
GET_BE_U_2(mpcp_reg_ack->echoed_assigned_port),
bittok2str(mpcp_reg_ack_flag_values, "Reserved", GET_U_1(mpcp_reg_ack->flags)),
GET_BE_U_2(mpcp_reg_ack->echoed_sync_time));
break;
default:
/* unknown opcode - hexdump for now */
print_unknown_data(ndo,pptr, "\n\t", length);
break;
}
}
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