/* * 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 #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; } }