/* packet-brdwlk.c * Routines for decoding MDS Port Analyzer Adapter (FC in Eth) Header * Copyright 2001, Dinesh G Dutt * * $Id: packet-brdwlk.c,v 1.2 2003/01/23 07:01:52 guy Exp $ * * Ethereal - Network traffic analyzer * By Gerald Combs * Copyright 1998 Gerald Combs * * Copied from WHATEVER_FILE_YOU_USED (where "WHATEVER_FILE_YOU_USED" * is a dissector file; if you just copied this from README.developer, * don't bother with the "Copied from" - you don't even need to put * in a "Copied from" if you copied an existing dissector, especially * if the bulk of the code in the new dissector is your code) * * 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 #include #include #include #ifdef HAVE_SYS_TYPES_H # include #endif #ifdef HAVE_NETINET_IN_H # include #endif #include #ifdef NEED_SNPRINTF_H # include "snprintf.h" #endif #include #include "etypes.h" #define BRDWLK_MAX_PACKET_CNT 0xFFFF #define BRDWLK_TRUNCATED_BIT 0x8 #define FCM_DELIM_SOFC1 0x01 #define FCM_DELIM_SOFI1 0x02 #define FCM_DELIM_SOFI2 0x04 #define FCM_DELIM_SOFI3 0x06 #define FCM_DELIM_SOFN1 0x03 #define FCM_DELIM_SOFN2 0x05 #define FCM_DELIM_SOFN3 0x07 #define FCM_DELIM_SOFF 0x08 #define FCM_DELIM_SOFC4 0x09 #define FCM_DELIM_SOFI4 0x0A #define FCM_DELIM_SOFN4 0x0B #define FCM_DELIM_EOFT 0x01 #define FCM_DELIM_EOFDT 0x02 #define FCM_DELIM_EOFN 0x03 #define FCM_DELIM_EOFA 0x04 #define FCM_DELIM_EOFNI 0x07 #define FCM_DELIM_EOFDTI 0x06 #define FCM_DELIM_EOFRT 0x0A #define FCM_DELIM_EOFRTI 0x0E #define FCM_DELIM_NOEOF 0xF0 #define FCM_DELIM_EOFJUMBO 0xF1 static const value_string brdwlk_sof_vals[] = { {FCM_DELIM_SOFI1, "SOFi1"}, {FCM_DELIM_SOFI2, "SOFi2"}, {FCM_DELIM_SOFI3, "SOFi3"}, {FCM_DELIM_SOFN1, "SOFn1"}, {FCM_DELIM_SOFN2, "SOFn2"}, {FCM_DELIM_SOFN3, "SOFn3"}, {FCM_DELIM_SOFF, "SOFf"}, {0, NULL}, }; static const value_string brdwlk_eof_vals[] = { {FCM_DELIM_EOFDT, "EOFdt"}, {FCM_DELIM_EOFA, "EOFa"}, {FCM_DELIM_EOFN, "EOFn"}, {FCM_DELIM_EOFT, "EOFt"}, {0, NULL}, }; static const value_string brdwlk_frametype_vals[] = { {0, NULL}, }; static const value_string brdwlk_error_vals[] = { {0, NULL}, }; static int hf_brdwlk_sof = -1; static int hf_brdwlk_eof = -1; static int hf_brdwlk_error = -1; static int hf_brdwlk_vsan = -1; static int hf_brdwlk_pktcnt = -1; static int hf_brdwlk_drop = -1; /* Initialize the subtree pointers */ static gint ett_brdwlk = -1; static gint proto_brdwlk = -1; static guint16 packet_count = 0; static gboolean first_pkt = TRUE; /* start of capture */ static dissector_handle_t data_handle; static dissector_handle_t fc_dissector_handle; static gchar * brdwlk_err_to_str (guint8 error, char *str) { if (str != NULL) { str[0] = '\0'; if (error & 0x2) { strcat (str, "Empty Frame, "); } if (error & 0x4) { strcat (str, "No Data, "); } if (error & 0x8) { strcat (str, "Truncated, "); } if (error & 0x10) { strcat (str, "Bad FC CRC, "); } if (error & 0x20) { strcat (str, "Fifo Full, "); } if (error & 0x40) { strcat (str, "Jumbo FC Frame, "); } if (error & 0x80) { strcat (str, "Ctrl Char Inside Frame"); } } return (str); } /* Code to actually dissect the packets */ static void dissect_brdwlk (tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree) { /* Set up structures needed to add the protocol subtree and manage it */ proto_item *ti; proto_tree *brdwlk_tree; tvbuff_t *next_tvb; guint8 error; int hdrlen = 2, offset = 0; guint16 pkt_cnt; gchar errstr[512]; /* Make entries in Protocol column and Info column on summary display */ if (check_col(pinfo->cinfo, COL_PROTOCOL)) col_set_str(pinfo->cinfo, COL_PROTOCOL, "Boardwalk"); if (check_col(pinfo->cinfo, COL_INFO)) col_clear(pinfo->cinfo, COL_INFO); if (tree) { ti = proto_tree_add_protocol_format (tree, proto_brdwlk, tvb, 0, hdrlen, "Boardwalk"); brdwlk_tree = proto_item_add_subtree (ti, ett_brdwlk); proto_tree_add_item (brdwlk_tree, hf_brdwlk_sof, tvb, offset, 1, 0); proto_tree_add_item (brdwlk_tree, hf_brdwlk_vsan, tvb, offset, 2, 0); pinfo->vsan = (tvb_get_ntohs (tvb, offset) & 0xFFF); /* Locate EOF which is the last 4 bytes of the frame */ offset = tvb_reported_length (tvb) - 4; proto_tree_add_item (brdwlk_tree, hf_brdwlk_pktcnt, tvb, offset, 2, 0); pkt_cnt = tvb_get_ntohs (tvb, offset); if (pkt_cnt != packet_count + 1) { if (first_pkt || (!pkt_cnt && (packet_count == BRDWLK_MAX_PACKET_CNT))) { proto_tree_add_boolean_hidden (brdwlk_tree, hf_brdwlk_drop, tvb, offset, 1, 0); } else { proto_tree_add_boolean_hidden (brdwlk_tree, hf_brdwlk_drop, tvb, offset, 1, 1); } } packet_count = pkt_cnt; error = tvb_get_guint8 (tvb, offset+2); proto_tree_add_uint_format (brdwlk_tree, hf_brdwlk_error, tvb, offset+2, 1, error, "Error: 0x%x (%s)", error, brdwlk_err_to_str (error, errstr)); #if 0 /* If received frame is truncated, set is_truncated flag */ if (error & BRDWLK_TRUNCATED_BIT) { pinfo->is_truncated = TRUE; } #endif proto_tree_add_item (brdwlk_tree, hf_brdwlk_eof, tvb, offset+3, 1, 0); } next_tvb = tvb_new_subset (tvb, 2, -1, -1); if (fc_dissector_handle) { call_dissector (fc_dissector_handle, next_tvb, pinfo, tree); } } /* Register the protocol with Ethereal */ /* this format is require because a script is used to build the C function that calls all the protocol registration. */ void proto_register_brdwlk (void) { /* Setup list of header fields See Section 1.6.1 for details*/ static hf_register_info hf[] = { { &hf_brdwlk_sof, {"SOF", "brdwlk.sof", FT_UINT8, BASE_HEX, VALS (brdwlk_sof_vals), 0xF0, "SOF", HFILL}}, { &hf_brdwlk_eof, {"EOF", "brdwlk.eof", FT_UINT8, BASE_HEX, VALS (brdwlk_eof_vals), 0x0, "EOF", HFILL}}, { &hf_brdwlk_error, {"Error", "brdwlk.error", FT_UINT8, BASE_DEC, NULL, 0x0, "Error", HFILL}}, { &hf_brdwlk_pktcnt, {"Packet Count", "brdwlk.pktcnt", FT_UINT16, BASE_DEC, NULL, 0x0, "", HFILL}}, { &hf_brdwlk_drop, {"Packet Dropped", "brdwlk.drop", FT_BOOLEAN, BASE_DEC, NULL, 0x0, "", HFILL}}, { &hf_brdwlk_vsan, {"VSAN", "brdwlk.vsan", FT_UINT16, BASE_DEC, NULL, 0xFFF, "", HFILL}}, }; /* Setup protocol subtree array */ static gint *ett[] = { &ett_brdwlk, }; /* Register the protocol name and description */ proto_brdwlk = proto_register_protocol("Boardwalk", "Boardwalk", "brdwlk"); /* Required function calls to register the header fields and subtrees used */ proto_register_field_array(proto_brdwlk, hf, array_length(hf)); proto_register_subtree_array(ett, array_length(ett)); } /* If this dissector uses sub-dissector registration add a registration routine. This format is required because a script is used to find these routines and create the code that calls these routines. */ void proto_reg_handoff_brdwlk(void) { dissector_handle_t brdwlk_handle; brdwlk_handle = create_dissector_handle (dissect_brdwlk, proto_brdwlk); dissector_add("ethertype", ETHERTYPE_BRDWALK, brdwlk_handle); data_handle = find_dissector("data"); fc_dissector_handle = find_dissector ("fc"); }