/* packet-trmac.c * Routines for Token-Ring Media Access Control * Gilbert Ramirez * * $Id: packet-trmac.c,v 1.12 1999/07/07 22:51:56 gram Exp $ * * Ethereal - Network traffic analyzer * By Gerald Combs * Copyright 1998 Gerald Combs * * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #ifdef HAVE_CONFIG_H # include "config.h" #endif #ifdef HAVE_SYS_TYPES_H # include #endif #include #include "packet.h" /* Major Vector */ static value_string major_vectors[] = { { 0x00, "Response" }, { 0x02, "Beacon" }, { 0x03, "Claim Token" }, { 0x04, "Ring Purge" }, { 0x05, "Active Monitor Present" }, { 0x06, "Standby Monitor Present" }, { 0x07, "Duplicate Address Test" }, { 0x09, "Transmit Forward" }, { 0x0B, "Remove Ring Station" }, { 0x0C, "Change Parameters" }, { 0x0D, "Initialize Ring Station" }, { 0x0E, "Request Ring Station Address" }, { 0x0F, "Request Ring Station Address" }, { 0x10, "Request Ring Station Attachments" }, { 0x20, "Request Initialization" }, { 0x22, "Report Ring Station Address" }, { 0x23, "Report Ring Station State" }, { 0x24, "Report Ring Station Attachments" }, { 0x25, "Report New Active Monitor" }, { 0x26, "Report NAUN Change" }, { 0x27, "Report Poll Error" }, { 0x28, "Report Monitor Errors" }, { 0x29, "Report Error" }, { 0x2A, "Report Transmit Forward" }, { 0x00, NULL } }; /* Sub-vectors */ static int sv_text(const u_char *pd, int pkt_offset, proto_tree *tree) { int sv_length = pd[0]; char *beacon[] = {"Recovery mode set", "Signal loss error", "Streaming signal not Claim Token MAC frame", "Streaming signal, Claim Token MAC frame"}; proto_tree *sv_tree; proto_item *ti; u_char errors[6]; /* isolating or non-isolating */ /* this just adds to the clutter on the screen... proto_tree_add_text(tree, pkt_offset, 1, "Subvector Length: %d bytes", sv_length);*/ switch(pd[1]) { case 0x01: /* Beacon Type */ proto_tree_add_text(tree, pkt_offset+1, sv_length-1, "Beacon Type: %s", beacon[ pntohs( &pd[2] ) ] ); break; case 0x02: /* NAUN */ proto_tree_add_text(tree, pkt_offset+1, sv_length-1, "NAUN: %s", ether_to_str((guint8*)&pd[2])); break; case 0x03: /* Local Ring Number */ proto_tree_add_text(tree, pkt_offset+1, sv_length-1, "Local Ring Number: 0x%04X (%d)", pntohs( &pd[2] ), pntohs( &pd[2] )); break; case 0x04: /* Assign Physical Location */ proto_tree_add_text(tree, pkt_offset+1, sv_length-1, "Assign Physical Location: 0x%08X", pntohl( &pd[2] ) ); break; case 0x05: /* Soft Error Report Value */ proto_tree_add_text(tree, pkt_offset+1, sv_length-1, "Soft Error Report Value: %d ms", 10 * pntohs( &pd[2] ) ); break; case 0x06: /* Enabled Function Classes */ proto_tree_add_text(tree, pkt_offset+1, sv_length-1, "Enabled Function Classes: %04X", pntohs( &pd[2] ) ); break; case 0x07: /* Allowed Access Priority */ proto_tree_add_text(tree, pkt_offset+1, sv_length-1, "Allowed Access Priority: %04X", pntohs( &pd[2] ) ); break; case 0x09: /* Correlator */ proto_tree_add_text(tree, pkt_offset+1, sv_length-1, "Correlator: %04X", pntohs( &pd[2] ) ); break; case 0x0A: /* Address of last neighbor notification */ proto_tree_add_text(tree, pkt_offset+1, sv_length-1, "Address of Last Neighbor Notification: %s", ether_to_str((guint8*)&pd[2])); break; case 0x0B: /* Physical Location */ proto_tree_add_text(tree, pkt_offset+1, sv_length-1, "Physical Location: 0x%08X", pntohl( &pd[2] ) ); break; case 0x20: /* Response Code */ proto_tree_add_text(tree, pkt_offset+1, sv_length-1, "Response Code: 0x%04X 0x%04X", pntohl( &pd[2] ), pntohl( &pd[4] ) ); break; case 0x21: /* Reserved */ proto_tree_add_text(tree, pkt_offset+1, sv_length-1, "Reserved: 0x%04X", pntohs( &pd[2] ) ); break; case 0x22: /* Product Instance ID */ proto_tree_add_text(tree, pkt_offset+1, sv_length-1, "Product Instance ID: ..."); break; case 0x23: /* Ring Station Microcode Level */ proto_tree_add_text(tree, pkt_offset+1, sv_length-1, "Ring Station Microcode Level: ..."); break; case 0x26: /* Wrap data */ proto_tree_add_text(tree, pkt_offset+1, sv_length-1, "Wrap Data: ... (%d bytes)", sv_length - 2); break; case 0x27: /* Frame Forward */ proto_tree_add_text(tree, pkt_offset+1, sv_length-1, "Frame Forward: ... (%d bytes)", sv_length - 2); break; case 0x29: /* Ring Station Status Subvector */ proto_tree_add_text(tree, pkt_offset+1, sv_length-1, "Ring Station Status Subvector: ..."); break; case 0x2A: /* Transmit Status Code */ proto_tree_add_text(tree, pkt_offset+1, sv_length-1, "Transmit Status Code: %04X", pntohs( &pd[2] ) ); break; case 0x2B: /* Group Address */ proto_tree_add_text(tree, pkt_offset+1, sv_length-1, "Group Address: %08X", pntohl( &pd[2] ) ); break; case 0x2C: /* Functional Address */ proto_tree_add_text(tree, pkt_offset+1, sv_length-1, "Functional Address: %08X", pntohl( &pd[2] ) ); break; case 0x2D: /* Isolating Error Counts */ memcpy(errors, &pd[2], 6); ti = proto_tree_add_text(tree, pkt_offset+1, sv_length-1, "Isolating Error Counts (%d total)", errors[0] + errors[1] + errors[2] + errors[3] + errors[4]); sv_tree = proto_item_add_subtree(ti, ETT_TR_IERR_CNT); proto_tree_add_text(sv_tree, pkt_offset+2, 1, "Line Errors: %d", errors[0]); proto_tree_add_text(sv_tree, pkt_offset+3, 1, "Internal Errors: %d", errors[1]); proto_tree_add_text(sv_tree, pkt_offset+4, 1, "Burst Errors: %d", errors[2]); proto_tree_add_text(sv_tree, pkt_offset+5, 1, "A/C Errors: %d", errors[3]); proto_tree_add_text(sv_tree, pkt_offset+6, 1, "Abort delimiter transmitted: %d", errors[4]); break; case 0x2E: /* Non-Isolating Error Counts */ memcpy(errors, &pd[2], 6); ti = proto_tree_add_text(tree, pkt_offset+1, sv_length-1, "Non-Isolating Error Counts (%d total)", errors[0] + errors[1] + errors[2] + errors[3] + errors[4]); sv_tree = proto_item_add_subtree(ti, ETT_TR_NERR_CNT); proto_tree_add_text(sv_tree, pkt_offset+2, 1, "Lost Frame Errors: %d", errors[0]); proto_tree_add_text(sv_tree, pkt_offset+3, 1, "Receiver Congestion: %d", errors[1]); proto_tree_add_text(sv_tree, pkt_offset+4, 1, "Frame-Copied Congestion: %d", errors[2]); proto_tree_add_text(sv_tree, pkt_offset+5, 1, "Frequency Errors: %d", errors[3]); proto_tree_add_text(sv_tree, pkt_offset+6, 1, "Token Errors: %d", errors[4]); break; case 0x30: /* Error Code */ proto_tree_add_text(tree, pkt_offset+1, sv_length-1, "Error Code: %04X", pntohs( &pd[2] ) ); break; default: /* Unknown */ proto_tree_add_text(tree, pkt_offset+1, 1, "Unknown Sub-Vector: 0x%02X", pd[1]); } return sv_length; } void dissect_trmac(const u_char *pd, int offset, frame_data *fd, proto_tree *tree) { proto_tree *mac_tree = NULL; proto_item *ti; int mv_length, sv_length, sv_offset, sv_additional; char *class[] = { "Ring Station", "LLC Manager", "", "", "Configuration Report Server", "Ring Parameter Server", "Ring Error Monitor" }; char *mv_text; mv_length = pntohs(&pd[offset]); if (tree) { ti = proto_tree_add_text(tree, offset, mv_length, "Media Access Control"); mac_tree = proto_item_add_subtree(ti, ETT_TR_MAC); } /* Interpret the major vector */ mv_text = val_to_str(pd[offset+3], major_vectors, "Unknown Major Vector: %d\n"); /* Summary information */ if (check_col(fd, COL_PROTOCOL)) col_add_str(fd, COL_PROTOCOL, "TR MAC"); if (check_col(fd, COL_INFO)) col_add_str(fd, COL_INFO, mv_text); if (tree) { if (mv_text) proto_tree_add_text(mac_tree, offset+3, 1, "Major Vector Command: %s", mv_text); else proto_tree_add_text(mac_tree, offset+3, 1, "Major Vector Command: %02X (Unknown)", pd[offset+3]); proto_tree_add_text(mac_tree, offset, 2, "Total Length: %d bytes", mv_length); proto_tree_add_text(mac_tree, offset+2, 1, "Source Class: %s", class[ pd[offset+2] & 0x0f ]); proto_tree_add_text(mac_tree, offset+2, 1, "Destination Class: %s", class[ pd[offset+2] >> 4 ]); /* interpret the subvectors */ sv_offset = 0; offset += 4; sv_length = mv_length - 4; while (sv_offset < sv_length) { sv_additional = sv_text(&pd[offset + sv_offset], offset + sv_offset, mac_tree); /* if this is a bad packet, we could get a 0-length added here, * looping forever */ if (sv_additional) sv_offset += sv_additional; else break; } } }