diff options
Diffstat (limited to 'epan/dissectors/packet-brdwlk.c')
| -rw-r--r-- | epan/dissectors/packet-brdwlk.c | 404 |
1 files changed, 404 insertions, 0 deletions
diff --git a/epan/dissectors/packet-brdwlk.c b/epan/dissectors/packet-brdwlk.c new file mode 100644 index 0000000000..1fce4130d8 --- /dev/null +++ b/epan/dissectors/packet-brdwlk.c @@ -0,0 +1,404 @@ +/* packet-brdwlk.c + * Routines for decoding MDS Port Analyzer Adapter (FC in Eth) Header + * Copyright 2001, Dinesh G Dutt <ddutt@andiamo.com> + * + * $Id$ + * + * Ethereal - Network traffic analyzer + * By Gerald Combs <gerald@ethereal.com> + * 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 + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> + +#ifdef HAVE_SYS_TYPES_H +# include <sys/types.h> +#endif + +#ifdef HAVE_NETINET_IN_H +# include <netinet/in.h> +#endif + +#include <glib.h> + +#ifdef NEED_SNPRINTF_H +# include "snprintf.h" +#endif + +#include <epan/packet.h> +#include "etypes.h" + +#define BRDWLK_MAX_PACKET_CNT 0xFFFF +#define BRDWLK_TRUNCATED_BIT 0x8 +#define BRDWLK_HAS_PLEN 0x1 + +#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 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; +static int hf_brdwlk_plen = -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 & 0x1) { + strcat (str, "Packet Length Present"); + } + + 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 = NULL; + tvbuff_t *next_tvb; + guint8 error, eof, sof; + int hdrlen = 2, + offset = 0; + gint len, reported_len, plen; + guint16 pkt_cnt; + gboolean dropped_packets; + 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); + + pinfo->vsan = (tvb_get_ntohs (tvb, offset) & 0xFFF); + sof = (tvb_get_guint8 (tvb, offset) & 0xF0) >> 4; + + if ((sof == FCM_DELIM_SOFI3) || (sof == FCM_DELIM_SOFI2) || (sof == FCM_DELIM_SOFI1) + || (sof == FCM_DELIM_SOFI4)) { + pinfo->sof_eof = PINFO_SOF_FIRST_FRAME; + } + else if (sof == FCM_DELIM_SOFF) { + pinfo->sof_eof = PINFO_SOF_SOFF; + } + + 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); + + } + + /* Locate EOF which is the last 4 bytes of the frame */ + len = tvb_length_remaining(tvb, hdrlen); + reported_len = tvb_reported_length_remaining(tvb, hdrlen); + if (reported_len < 4) { + /* + * This packet is claimed not to even have enough data for + * a 4-byte EOF. + * Don't try to process the EOF. + */ + ; + } + else if (len < reported_len) { + /* + * This packet is claimed to have enough data for a 4-byte EOF, + * but we didn't capture all of the packet. + * Slice off the 4-byte EOF from the reported length, and trim + * the captured length so it's no more than the reported length; + * that will slice off what of the EOF, if any, is in the + * captured length. + */ + reported_len -= 4; + if (len > reported_len) + len = reported_len; + } + else { + /* + * We have the entire packet, and it includes a 4-byte EOF. + * Slice it off, and put it into the tree if we're building + * a tree. + */ + len -= 4; + reported_len -= 4; + offset = tvb_reported_length(tvb) - 4; + pkt_cnt = tvb_get_ntohs (tvb, offset); + if (tree) { + proto_tree_add_uint (brdwlk_tree, hf_brdwlk_pktcnt, tvb, offset, + 2, pkt_cnt); + } + dropped_packets = FALSE; + if (pinfo->fd->flags.visited) { + /* + * This isn't the first pass, so we can't use the global + * "packet_count" variable to determine whether there were + * any dropped frames or not. + * We therefore attach a non-null pointer as frame data to + * any frame preceded by dropped packets. + */ + if (p_get_proto_data(pinfo->fd, proto_brdwlk) != NULL) + dropped_packets = TRUE; + } else { + /* + * This is the first pass, so we have to use the global + * "packet_count" variable to determine whether there were + * any dropped frames or not. + * + * XXX - can there be more than one stream of packets, so that + * we can't just use a global variable? + */ + if (pkt_cnt != packet_count + 1) { + if (!first_pkt && + (pkt_cnt != 0 || (packet_count != BRDWLK_MAX_PACKET_CNT))) { + dropped_packets = TRUE; + + /* + * Mark this frame as having been preceded by dropped + * packets. (The data we use as the frame data doesn't + * matter - it just matters that it's non-null.) + */ + p_add_proto_data(pinfo->fd, proto_brdwlk, &packet_count); + } + } + + if (tree) { + proto_tree_add_boolean_hidden (brdwlk_tree, hf_brdwlk_drop, + tvb, offset, 0, dropped_packets); + } + } + packet_count = pkt_cnt; + + error = tvb_get_guint8 (tvb, offset+2); + if (tree) { + 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)); + } + + eof = tvb_get_guint8 (tvb, offset+3); + if (eof != FCM_DELIM_EOFN) { + pinfo->sof_eof |= PINFO_EOF_LAST_FRAME; + } + else if (eof != FCM_DELIM_EOFT) { + pinfo->sof_eof |= PINFO_EOF_INVALID; + } + + if (tree) { + proto_tree_add_item (brdwlk_tree, hf_brdwlk_eof, tvb, offset+3, + 1, 0); + } + + if ((error & BRDWLK_HAS_PLEN) && tree) { + /* In newer Boardwalks, if this bit is set, the actual frame length + * is also provided. This length is the size between SOF & EOF + * including FC CRC. + */ + plen = tvb_get_ntohl (tvb, offset-4); + plen *= 4; + proto_tree_add_uint (brdwlk_tree, hf_brdwlk_plen, tvb, offset-4, + 4, plen); + +#if 0 + /* XXX - this would throw an exception if it would increase + * the reported length. + */ + if (error & BRDWLK_TRUNCATED_BIT) { + tvb_set_reported_length (tvb, plen); + } +#endif + } + } + + next_tvb = tvb_new_subset (tvb, 2, len, reported_len); + if (fc_dissector_handle) { + call_dissector (fc_dissector_handle, next_tvb, pinfo, tree); + } +} + +static void +brdwlk_init(void) +{ + packet_count = 0; + first_pkt = TRUE; +} + +/* 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), + 0x0F, "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}}, + { &hf_brdwlk_plen, + {"Original Packet Length", "brdwlk.plen", FT_UINT32, BASE_DEC, NULL, 0x0, "", + 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)); + + register_init_routine(&brdwlk_init); +} + + +/* 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); + dissector_add("ethertype", 0xABCD, brdwlk_handle); + data_handle = find_dissector("data"); + fc_dissector_handle = find_dissector ("fc"); +} |