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-rw-r--r--print-mpcp.c235
1 files changed, 235 insertions, 0 deletions
diff --git a/print-mpcp.c b/print-mpcp.c
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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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