/* packet-fddi.c * Routines for FDDI packet disassembly * * Laurent Deniel * * $Id: packet-fddi.c,v 1.11 1999/03/23 03:14:37 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" #include "resolv.h" /* FDDI Frame Control values */ #define FDDI_FC_VOID 0x00 /* Void frame */ #define FDDI_FC_NRT 0x80 /* Nonrestricted token */ #define FDDI_FC_RT 0xc0 /* Restricted token */ #define FDDI_FC_MAC 0xc0 /* MAC frame */ #define FDDI_FC_SMT 0x40 /* SMT frame */ #define FDDI_FC_SMT_INFO 0x41 /* SMT Info */ #define FDDI_FC_SMT_NSA 0x4F /* SMT Next station adrs */ #define FDDI_FC_SMT_MIN FDDI_FC_SMT_INFO #define FDDI_FC_SMT_MAX FDDI_FC_SMT_NSA #define FDDI_FC_MAC_MIN 0xc1 #define FDDI_FC_MAC_BEACON 0xc2 /* MAC Beacon frame */ #define FDDI_FC_MAC_CLAIM 0xc3 /* MAC Claim frame */ #define FDDI_FC_MAC_MAX 0xcf #define FDDI_FC_LLC_ASYNC 0x50 /* Async. LLC frame */ #define FDDI_FC_LLC_ASYNC_MIN FDDI_FC_LLC_ASYNC #define FDDI_FC_LLC_ASYNC_DEF 0x54 #define FDDI_FC_LLC_ASYNC_MAX 0x5f #define FDDI_FC_LLC_SYNC 0xd0 /* Sync. LLC frame */ #define FDDI_FC_LLC_SYNC_MIN FDDI_FC_LLC_SYNC #define FDDI_FC_LLC_SYNC_MAX 0xd7 #define FDDI_FC_IMP_ASYNC 0x60 /* Implementor Async. */ #define FDDI_FC_IMP_ASYNC_MIN FDDI_FC_IMP_ASYNC #define FDDI_FC_IMP_ASYNC_MAX 0x6f #define FDDI_FC_IMP_SYNC 0xe0 /* Implementor Synch. */ #define FDDI_HEADER_SIZE 13 /* field positions */ #define FDDI_P_FC 0 #define FDDI_P_DHOST 1 #define FDDI_P_SHOST 7 /* On some systems, the FDDI MAC addresses are bit-swapped. */ #if !defined(ultrix) && !defined(__alpha) && !defined(__bsdi) #define BIT_SWAPPED_MAC_ADDRS #endif #ifdef BIT_SWAPPED_MAC_ADDRS /* "swaptab[i]" is the value of "i" with the bits reversed. */ static u_char swaptab[256] = { 0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0, 0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0, 0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8, 0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8, 0x04, 0x84, 0x44, 0xc4, 0x24, 0xa4, 0x64, 0xe4, 0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4, 0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec, 0x1c, 0x9c, 0x5c, 0xdc, 0x3c, 0xbc, 0x7c, 0xfc, 0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2, 0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2, 0x0a, 0x8a, 0x4a, 0xca, 0x2a, 0xaa, 0x6a, 0xea, 0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa, 0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6, 0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6, 0x76, 0xf6, 0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee, 0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe, 0x01, 0x81, 0x41, 0xc1, 0x21, 0xa1, 0x61, 0xe1, 0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1, 0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9, 0x19, 0x99, 0x59, 0xd9, 0x39, 0xb9, 0x79, 0xf9, 0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5, 0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5, 0x0d, 0x8d, 0x4d, 0xcd, 0x2d, 0xad, 0x6d, 0xed, 0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd, 0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3, 0x13, 0x93, 0x53, 0xd3, 0x33, 0xb3, 0x73, 0xf3, 0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb, 0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb, 0x07, 0x87, 0x47, 0xc7, 0x27, 0xa7, 0x67, 0xe7, 0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7, 0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef, 0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff, }; #endif static void get_mac_addr(u_char *swapped_addr, const u_char *addr) { int i; for (i = 0; i < 6; i++) { #ifdef BIT_SWAPPED_MAC_ADDRS swapped_addr[i] = swaptab[addr[i]]; #else swapped_addr[i] = addr[i]; #endif } } void capture_fddi(const u_char *pd, guint32 cap_len, packet_counts *ld) { int offset = 0, fc; if (cap_len < FDDI_HEADER_SIZE) { ld->other++; return; } offset = FDDI_HEADER_SIZE; fc = (int) pd[FDDI_P_FC]; switch (fc) { /* From now, only 802.2 SNAP (Async. LCC frame) is supported */ case FDDI_FC_LLC_ASYNC + 0 : case FDDI_FC_LLC_ASYNC + 1 : case FDDI_FC_LLC_ASYNC + 2 : case FDDI_FC_LLC_ASYNC + 3 : case FDDI_FC_LLC_ASYNC + 4 : case FDDI_FC_LLC_ASYNC + 5 : case FDDI_FC_LLC_ASYNC + 6 : case FDDI_FC_LLC_ASYNC + 7 : case FDDI_FC_LLC_ASYNC + 8 : case FDDI_FC_LLC_ASYNC + 9 : case FDDI_FC_LLC_ASYNC + 10 : case FDDI_FC_LLC_ASYNC + 11 : case FDDI_FC_LLC_ASYNC + 12 : case FDDI_FC_LLC_ASYNC + 13 : case FDDI_FC_LLC_ASYNC + 14 : case FDDI_FC_LLC_ASYNC + 15 : capture_llc(pd, offset, cap_len, ld); return; default : ld->other++; return; } /* fc */ } /* capture_fddi */ void dissect_fddi(const u_char *pd, frame_data *fd, proto_tree *tree) { int offset = 0, fc; proto_tree *fh_tree; proto_item *ti; u_char src[6], dst[6]; if (fd->cap_len < FDDI_HEADER_SIZE) { dissect_data(pd, offset, fd, tree); return; } /* Extract the source and destination addresses, possibly bit-swapping them. */ get_mac_addr(dst, (u_char *)&pd[FDDI_P_DHOST]); get_mac_addr(src, (u_char *)&pd[FDDI_P_SHOST]); fc = (int) pd[FDDI_P_FC]; if (check_col(fd, COL_RES_DL_SRC)) col_add_str(fd, COL_RES_DL_SRC, get_ether_name(src)); if (check_col(fd, COL_RES_DL_DST)) col_add_str(fd, COL_RES_DL_DST, get_ether_name(dst)); if (check_col(fd, COL_UNRES_DL_SRC)) col_add_str(fd, COL_UNRES_DL_SRC, ether_to_str(src)); if (check_col(fd, COL_UNRES_DL_DST)) col_add_str(fd, COL_UNRES_DL_DST, ether_to_str(dst)); if (check_col(fd, COL_PROTOCOL)) col_add_str(fd, COL_PROTOCOL, "N/A"); if (check_col(fd, COL_INFO)) col_add_str(fd, COL_INFO, "FDDI"); offset = FDDI_HEADER_SIZE; if (tree) { ti = proto_tree_add_item(tree, 0, offset, "FDDI %s", (fc >= FDDI_FC_LLC_ASYNC_MIN && fc <= FDDI_FC_LLC_ASYNC_MAX) ? "Async LLC" : "unsupported FC"); fh_tree = proto_tree_new(); proto_item_add_subtree(ti, fh_tree, ETT_FDDI); proto_tree_add_item(fh_tree, FDDI_P_FC, 1, "Frame Control: 0x%02x", fc); proto_tree_add_item(fh_tree, FDDI_P_DHOST, 6, "Destination: %s (%s)", ether_to_str(dst), get_ether_name(dst)); proto_tree_add_item(fh_tree, FDDI_P_SHOST, 6, "Source: %s (%s)", ether_to_str(src), get_ether_name(src)); } switch (fc) { /* From now, only 802.2 SNAP (Async. LCC frame) is supported */ case FDDI_FC_LLC_ASYNC + 0 : case FDDI_FC_LLC_ASYNC + 1 : case FDDI_FC_LLC_ASYNC + 2 : case FDDI_FC_LLC_ASYNC + 3 : case FDDI_FC_LLC_ASYNC + 4 : case FDDI_FC_LLC_ASYNC + 5 : case FDDI_FC_LLC_ASYNC + 6 : case FDDI_FC_LLC_ASYNC + 7 : case FDDI_FC_LLC_ASYNC + 8 : case FDDI_FC_LLC_ASYNC + 9 : case FDDI_FC_LLC_ASYNC + 10 : case FDDI_FC_LLC_ASYNC + 11 : case FDDI_FC_LLC_ASYNC + 12 : case FDDI_FC_LLC_ASYNC + 13 : case FDDI_FC_LLC_ASYNC + 14 : case FDDI_FC_LLC_ASYNC + 15 : dissect_llc(pd, offset, fd, tree); return; default : dissect_data(pd, offset, fd, tree); return; } /* fc */ } /* dissect_fddi */