/* * 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 #include "netdissect.h" #include "extract.h" #define MPCP_TIMESTAMP_LEN 4 #define MPCP_TIMESTAMP_DURATION_LEN 2 struct mpcp_common_header_t { uint8_t opcode[2]; uint8_t timestamp[MPCP_TIMESTAMP_LEN]; }; #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 { uint8_t starttime[MPCP_TIMESTAMP_LEN]; uint8_t duration[MPCP_TIMESTAMP_DURATION_LEN]; }; struct mpcp_reg_req_t { uint8_t flags; uint8_t pending_grants; }; static const struct tok mpcp_reg_req_flag_values[] = { { 1, "Register" }, { 3, "De-Register" }, { 0, NULL} }; struct mpcp_reg_t { uint8_t assigned_port[2]; uint8_t flags; uint8_t sync_time[MPCP_TIMESTAMP_DURATION_LEN]; 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 { uint8_t flags; uint8_t echoed_assigned_port[2]; uint8_t echoed_sync_time[MPCP_TIMESTAMP_DURATION_LEN]; }; static const struct tok mpcp_reg_ack_flag_values[] = { { 0, "NACK" }, { 1, "ACK" }, { 0, NULL} }; void mpcp_print(netdissect_options *ndo, register const u_char *pptr, register u_int length) { union { const struct mpcp_common_header_t *common_header; const struct mpcp_grant_t *grant; const struct mpcp_reg_req_t *reg_req; const struct mpcp_reg_t *reg; const struct mpcp_reg_ack_t *reg_ack; } mpcp; const u_char *tptr; uint16_t opcode; uint8_t grant_numbers, grant; uint8_t queue_sets, queue_set, report_bitmap, report; tptr=pptr; mpcp.common_header = (const struct mpcp_common_header_t *)pptr; ND_TCHECK2(*tptr, sizeof(const struct mpcp_common_header_t)); opcode = EXTRACT_16BITS(mpcp.common_header->opcode); ND_PRINT((ndo, "MPCP, Opcode %s", tok2str(mpcp_opcode_values, "Unknown (%u)", opcode))); if (opcode != MPCP_OPCODE_PAUSE) { ND_PRINT((ndo, ", Timestamp %u ticks", EXTRACT_32BITS(mpcp.common_header->timestamp))); } ND_PRINT((ndo, ", length %u", length)); if (!ndo->ndo_vflag) return; tptr += sizeof(const struct mpcp_common_header_t); switch (opcode) { case MPCP_OPCODE_PAUSE: break; case MPCP_OPCODE_GATE: ND_TCHECK2(*tptr, MPCP_GRANT_NUMBER_LEN); grant_numbers = *tptr & MPCP_GRANT_NUMBER_MASK; ND_PRINT((ndo, "\n\tGrant Numbers %u, Flags [ %s ]", grant_numbers, bittok2str(mpcp_grant_flag_values, "?", *tptr &~ MPCP_GRANT_NUMBER_MASK))); tptr++; for (grant = 1; grant <= grant_numbers; grant++) { ND_TCHECK2(*tptr, sizeof(const struct mpcp_grant_t)); mpcp.grant = (const struct mpcp_grant_t *)tptr; ND_PRINT((ndo, "\n\tGrant #%u, Start-Time %u ticks, duration %u ticks", grant, EXTRACT_32BITS(mpcp.grant->starttime), EXTRACT_16BITS(mpcp.grant->duration))); tptr += sizeof(const struct mpcp_grant_t); } ND_TCHECK2(*tptr, MPCP_TIMESTAMP_DURATION_LEN); ND_PRINT((ndo, "\n\tSync-Time %u ticks", EXTRACT_16BITS(tptr))); break; case MPCP_OPCODE_REPORT: ND_TCHECK2(*tptr, MPCP_REPORT_QUEUESETS_LEN); queue_sets = *tptr; tptr+=MPCP_REPORT_QUEUESETS_LEN; ND_PRINT((ndo, "\n\tTotal Queue-Sets %u", queue_sets)); for (queue_set = 1; queue_set < queue_sets; queue_set++) { ND_TCHECK2(*tptr, MPCP_REPORT_REPORTBITMAP_LEN); report_bitmap = *(tptr); ND_PRINT((ndo, "\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_TCHECK2(*tptr, MPCP_TIMESTAMP_DURATION_LEN); ND_PRINT((ndo, "\n\t Q%u Report, Duration %u ticks", report, EXTRACT_16BITS(tptr))); tptr+=MPCP_TIMESTAMP_DURATION_LEN; } report++; report_bitmap = report_bitmap >> 1; } } break; case MPCP_OPCODE_REG_REQ: ND_TCHECK2(*tptr, sizeof(const struct mpcp_reg_req_t)); mpcp.reg_req = (const struct mpcp_reg_req_t *)tptr; ND_PRINT((ndo, "\n\tFlags [ %s ], Pending-Grants %u", bittok2str(mpcp_reg_req_flag_values, "Reserved", mpcp.reg_req->flags), mpcp.reg_req->pending_grants)); break; case MPCP_OPCODE_REG: ND_TCHECK2(*tptr, sizeof(const struct mpcp_reg_t)); mpcp.reg = (const struct mpcp_reg_t *)tptr; ND_PRINT((ndo, "\n\tAssigned-Port %u, Flags [ %s ]" \ "\n\tSync-Time %u ticks, Echoed-Pending-Grants %u", EXTRACT_16BITS(mpcp.reg->assigned_port), bittok2str(mpcp_reg_flag_values, "Reserved", mpcp.reg->flags), EXTRACT_16BITS(mpcp.reg->sync_time), mpcp.reg->echoed_pending_grants)); break; case MPCP_OPCODE_REG_ACK: ND_TCHECK2(*tptr, sizeof(const struct mpcp_reg_ack_t)); mpcp.reg_ack = (const struct mpcp_reg_ack_t *)tptr; ND_PRINT((ndo, "\n\tEchoed-Assigned-Port %u, Flags [ %s ]" \ "\n\tEchoed-Sync-Time %u ticks", EXTRACT_16BITS(mpcp.reg_ack->echoed_assigned_port), bittok2str(mpcp_reg_ack_flag_values, "Reserved", mpcp.reg_ack->flags), EXTRACT_16BITS(mpcp.reg_ack->echoed_sync_time))); break; default: /* unknown opcode - hexdump for now */ print_unknown_data(ndo,pptr, "\n\t", length); break; } return; trunc: ND_PRINT((ndo, "\n\t[|MPCP]")); } /* * Local Variables: * c-style: whitesmith * c-basic-offset: 8 * End: */