/* * packet-fcoe.c * Routines for FCoE dissection - Fibre Channel over Ethernet * Copyright (c) 2006 Nuova Systems, Inc. (jre@nuovasystems.com) * * $Id$ * * Wireshark - Network traffic analyzer * By Gerald Combs * Copyright 1998 Gerald Combs * * Based on packet-fcip.c, Copyright 2001, Dinesh G Dutt (ddutt@cisco.com) * * 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. */ /* * For FCoE protocol details, see http://fcoe.com. */ #ifdef HAVE_CONFIG_H # include "config.h" #endif #include #include #include #include #include #include #include #include #include #define FCOE_ENCAP_HEADER_LEN 2 typedef enum { FCOE_EOFn = 0x41, FCOE_EOFt = 0x42, FCOE_EOFrt = 0x44, FCOE_EOFdt = 0x46, FCOE_EOFni = 0x49, FCOE_EOFdti = 0x4E, FCOE_EOFrti = 0x4F, FCOE_EOFa = 0x50 } fcoe_eof_t; typedef enum { FCOE_SOFf = 0x8, FCOE_SOFi4 = 0x9, FCOE_SOFi2 = 0xD, FCOE_SOFi3 = 0xE, FCOE_SOFn4 = 0x1, FCOE_SOFn2 = 0x5, FCOE_SOFn3 = 0x6, FCOE_SOFc4 = 0x9 } fcoe_sof_t; static const value_string fcoe_eof_vals[] = { {FCOE_EOFn, "EOFn" }, {FCOE_EOFt, "EOFt" }, {FCOE_EOFrt, "EOFrt" }, {FCOE_EOFdt, "EOFdt" }, {FCOE_EOFni, "EOFni" }, {FCOE_EOFdti, "EOFdti" }, {FCOE_EOFrti, "EOFrti" }, {FCOE_EOFa, "EOFa" }, {0, NULL} }; static const value_string fcoe_sof_vals[] = { {FCOE_SOFf, "SOFf" }, {FCOE_SOFi4, "SOFi4" }, {FCOE_SOFi2, "SOFi2" }, {FCOE_SOFi3, "SOFi3" }, {FCOE_SOFn4, "SOFn4" }, {FCOE_SOFn2, "SOFn2" }, {FCOE_SOFn3, "SOFn3" }, {FCOE_SOFc4, "SOFc4" }, {0, NULL} }; static int proto_fcoe = -1; static int hf_fcoe_ver = -1; static int hf_fcoe_len = -1; static int hf_fcoe_sof = -1; static int hf_fcoe_eof = -1; static int hf_fcoe_crc = -1; static int hf_fcoe_crc_bad = -1; static int hf_fcoe_crc_good = -1; static int ett_fcoe = -1; static int ett_fcoe_crc = -1; static dissector_handle_t data_handle; static dissector_handle_t fc_handle; static void dissect_fcoe(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree) { gint eof_offset = 0; gint frame_len = 0; guint version; char *ver; guint16 len_sof; gint bytes_remaining = tvb_length_remaining(tvb, 0); guint8 sof = 0; guint8 eof = 0; const char *eof_str; char *crc_msg; proto_item *ti; proto_item *item; proto_tree *fcoe_tree = NULL; proto_tree *crc_tree; tvbuff_t *next_tvb; gboolean crc_exists; guint32 crc_computed = 0; guint32 crc = 0; if (bytes_remaining < FCOE_ENCAP_HEADER_LEN) { return; } if (check_col(pinfo->cinfo, COL_PROTOCOL)) col_set_str(pinfo->cinfo, COL_PROTOCOL, "FCOE"); len_sof = tvb_get_ntohs(tvb, 0); frame_len = (len_sof & 0x3ff0) >> 2; sof = len_sof & 0xf; version = len_sof >> 14; next_tvb = tvb_new_subset(tvb, FCOE_ENCAP_HEADER_LEN, -1, frame_len - 4); if (tree) { /* * Only version 0 is defined at this point. * Don't print the version in the short summary if it is zero. */ ver = ""; if (version != 0) { int ver_buf_len = 16; ver = ep_alloc(ver_buf_len); g_snprintf(ver, ver_buf_len, "ver %d ", version); } eof_offset = FCOE_ENCAP_HEADER_LEN + frame_len; eof_str = "none"; if (tvb_bytes_exist(tvb, eof_offset, 1)) { eof = tvb_get_guint8(tvb, eof_offset); eof_str = val_to_str(eof, fcoe_eof_vals, "0x%x"); } /* * Check the CRC. */ crc_msg = ""; crc_exists = tvb_bytes_exist(tvb, eof_offset - 4, 4); if (crc_exists) { crc = tvb_get_ntohl(tvb, eof_offset - 4); crc_computed = crc32_802_tvb(next_tvb, frame_len - 4); if (crc != crc_computed) { crc_msg = " [bad FC CRC]"; } } ti = proto_tree_add_protocol_format(tree, proto_fcoe, tvb, 0, FCOE_ENCAP_HEADER_LEN, "FCoE %s(%s/%s) %d bytes%s", ver, val_to_str(sof, fcoe_sof_vals, "0x%x"), eof_str, frame_len, crc_msg); /* Dissect the FCoE header */ fcoe_tree = proto_item_add_subtree(ti, ett_fcoe); proto_tree_add_uint(fcoe_tree, hf_fcoe_sof, tvb, 1, 1, sof); proto_tree_add_uint(fcoe_tree, hf_fcoe_ver, tvb, 0, 1, version); proto_tree_add_uint(fcoe_tree, hf_fcoe_len, tvb, 0, 2, frame_len); /* * Create the CRC information. */ item = ti; if (crc_exists) { if (crc == crc_computed) { item = proto_tree_add_uint_format(fcoe_tree, hf_fcoe_crc, tvb, eof_offset - 4, 4, crc, "CRC: %8.8x [valid]", crc); } else { item = proto_tree_add_uint_format(fcoe_tree, hf_fcoe_crc, tvb, eof_offset - 4, 4, crc, "CRC: %8.8x " "[error: should be %8.8x]", crc, crc_computed); expert_add_info_format(pinfo, item, PI_CHECKSUM, PI_ERROR, "Bad FC CRC %8.8x %8.x", crc, crc_computed); } } crc_tree = proto_item_add_subtree(item, ett_fcoe_crc); ti = proto_tree_add_boolean(crc_tree, hf_fcoe_crc_bad, tvb, eof_offset - 4, 4, crc_exists && crc != crc_computed); PROTO_ITEM_SET_GENERATED(ti); ti = proto_tree_add_boolean(crc_tree, hf_fcoe_crc_good, tvb, eof_offset - 4, 4, crc_exists && crc == crc_computed); PROTO_ITEM_SET_GENERATED(ti); /* * Interpret the EOF. */ if (tvb_bytes_exist(tvb, eof_offset, 1)) { proto_tree_add_item(fcoe_tree, hf_fcoe_eof, tvb, eof_offset, 1, 0); } } /* Set the SOF/EOF flags in the packet_info header */ pinfo->sof_eof = 0; if (sof == FCOE_SOFi3 || sof == FCOE_SOFi2 || sof == FCOE_SOFi4) { pinfo->sof_eof = PINFO_SOF_FIRST_FRAME; } else if (sof == FCOE_SOFf) { pinfo->sof_eof = PINFO_SOF_SOFF; } if (eof != FCOE_EOFn) { pinfo->sof_eof |= PINFO_EOF_LAST_FRAME; } else if (eof != FCOE_EOFt) { pinfo->sof_eof |= PINFO_EOF_INVALID; } /* Call the FC Dissector if this is carrying an FC frame */ if (fc_handle) { call_dissector(fc_handle, next_tvb, pinfo, tree); } else if (data_handle) { call_dissector(data_handle, next_tvb, pinfo, tree); } } void proto_register_fcoe(void) { /* Setup list of header fields See Section 1.6.1 for details*/ static hf_register_info hf[] = { { &hf_fcoe_sof, {"SOF", "fcoe.sof", FT_UINT8, BASE_HEX, VALS(&fcoe_sof_vals), 0, "", HFILL}}, { &hf_fcoe_eof, {"EOF", "fcoe.eof", FT_UINT8, BASE_HEX, VALS(&fcoe_eof_vals), 0, "", HFILL}}, { &hf_fcoe_ver, {"Version", "fcoe.ver", FT_UINT32, BASE_DEC, NULL, 0, "", HFILL}}, { &hf_fcoe_len, {"Frame length", "fcoe.len", FT_UINT32, BASE_DEC, NULL, 0, "", HFILL}}, { &hf_fcoe_crc, {"CRC", "fcoe.crc", FT_UINT32, BASE_HEX, NULL, 0, "", HFILL}}, { &hf_fcoe_crc_good, {"CRC good", "fcoe.crc_good", FT_BOOLEAN, BASE_NONE, NULL, 0, "True: CRC matches packet content; " "False: doesn't match or not checked.", HFILL }}, { &hf_fcoe_crc_bad, {"CRC bad", "fcoe.crc_bad", FT_BOOLEAN, BASE_NONE, NULL, 0, "True: CRC doesn't match packet content; " "False: matches or not checked.", HFILL }} }; static gint *ett[] = { &ett_fcoe, &ett_fcoe_crc }; /* Register the protocol name and description */ proto_fcoe = proto_register_protocol("Fibre Channel over Ethernet", "FCoE", "fcoe"); /* Required function calls to register the header fields and * subtrees used */ proto_register_field_array(proto_fcoe, hf, array_length(hf)); proto_register_subtree_array(ett, array_length(ett)); } /* * This function name is required because a script is used to find these * routines and create the code that calls these routines. */ void proto_reg_handoff_fcoe(void) { dissector_handle_t fcoe_handle; fcoe_handle = create_dissector_handle(dissect_fcoe, proto_fcoe); dissector_add("ethertype", ETHERTYPE_FCOE, fcoe_handle); data_handle = find_dissector("data"); fc_handle = find_dissector("fc"); }