forked from osmocom/wireshark
![Guy Harris](/assets/img/avatar_default.png)
Change-Id: I581e14af2981c723a81e9c0340de0229b832e51a Reviewed-on: https://code.wireshark.org/review/19595 Reviewed-by: Guy Harris <guy@alum.mit.edu>
371 lines
12 KiB
C
371 lines
12 KiB
C
/*
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* packet-fcoib.c
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* Routines for FCoIB dissection - Fibre Channel over Infiniband
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* Copyright (c) 2010 Mellanox Technologies Ltd. (slavak@mellanox.co.il)
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* Based on packet-fcoe.c, Copyright (c) 2006 Nuova Systems, Inc. (jre@nuovasystems.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include <stdlib.h>
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#include <errno.h>
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#include <epan/packet.h>
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#include <epan/prefs.h>
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#include <epan/crc32-tvb.h>
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#include <epan/expert.h>
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#include <epan/addr_resolv.h>
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#include "packet-fc.h"
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void proto_register_fcoib(void);
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void proto_reg_handoff_fcoib(void);
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#define FCOIB_HEADER_LEN 16 /* header: encap. header, SOF, and padding */
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#define FCOIB_TRAILER_LEN 8 /* trailer: FC-CRC, EOF and padding */
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#define FCOIB_VER_OFFSET 2 /* offset of ver field (in bytes) inside FCoIB Encap. header */
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typedef enum {
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FCOIB_EOFn = 0x41,
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FCOIB_EOFt = 0x42,
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FCOIB_EOFrt = 0x44,
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FCOIB_EOFdt = 0x46,
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FCOIB_EOFni = 0x49,
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FCOIB_EOFdti = 0x4E,
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FCOIB_EOFrti = 0x4F,
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FCOIB_EOFa = 0x50
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} fcoib_eof_t;
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typedef enum {
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FCOIB_SOFf = 0x28,
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FCOIB_SOFi4 = 0x29,
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FCOIB_SOFi2 = 0x2D,
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FCOIB_SOFi3 = 0x2E,
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FCOIB_SOFn4 = 0x31,
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FCOIB_SOFn2 = 0x35,
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FCOIB_SOFn3 = 0x36,
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FCOIB_SOFc4 = 0x39
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} fcoib_sof_t;
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static const value_string fcoib_eof_vals[] = {
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{FCOIB_EOFn, "EOFn" },
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{FCOIB_EOFt, "EOFt" },
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{FCOIB_EOFrt, "EOFrt" },
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{FCOIB_EOFdt, "EOFdt" },
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{FCOIB_EOFni, "EOFni" },
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{FCOIB_EOFdti, "EOFdti" },
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{FCOIB_EOFrti, "EOFrti" },
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{FCOIB_EOFa, "EOFa" },
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{0, NULL}
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};
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static const value_string fcoib_sof_vals[] = {
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{FCOIB_SOFf, "SOFf" },
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{FCOIB_SOFi4, "SOFi4" },
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{FCOIB_SOFi2, "SOFi2" },
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{FCOIB_SOFi3, "SOFi3" },
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{FCOIB_SOFn4, "SOFn4" },
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{FCOIB_SOFn2, "SOFn2" },
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{FCOIB_SOFn3, "SOFn3" },
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{FCOIB_SOFc4, "SOFc4" },
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{0, NULL}
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};
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static int proto_fcoib = -1;
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static int hf_fcoib_ver = -1;
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static int hf_fcoib_sig = -1;
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static int hf_fcoib_sof = -1;
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static int hf_fcoib_eof = -1;
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static int hf_fcoib_crc = -1;
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static int hf_fcoib_crc_status = -1;
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static int ett_fcoib = -1;
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static expert_field ei_fcoib_crc = EI_INIT;
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static dissector_handle_t fc_handle;
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static int
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dissect_fcoib(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
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{
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gint crc_offset;
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gint eof_offset;
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gint sof_offset;
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gint frame_len;
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guint version;
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const char *ver;
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guint8 sof = 0;
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guint8 eof = 0;
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guint8 sig = 0;
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const char *eof_str;
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const char *sof_str;
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const char *crc_msg;
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const char *len_msg;
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proto_item *ti;
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proto_tree *fcoib_tree;
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tvbuff_t *next_tvb;
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gboolean crc_exists;
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guint32 crc_computed = 0;
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guint32 crc = 0;
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fc_data_t fc_data;
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frame_len = tvb_reported_length_remaining(tvb, 0) -
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FCOIB_HEADER_LEN - FCOIB_TRAILER_LEN;
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crc_offset = FCOIB_HEADER_LEN + frame_len;
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eof_offset = crc_offset + 4;
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sof_offset = FCOIB_HEADER_LEN - 1;
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if (frame_len <= 0)
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return 0; /* this packet isn't even long enough to contain the header+trailer w/o FC payload! */
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "FCoIB");
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next_tvb = tvb_new_subset_length(tvb, FCOIB_HEADER_LEN, frame_len);
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/*
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* Only version 0 is defined at this point.
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* Don't print the version in the short summary if it is zero.
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*/
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ver = "";
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version = tvb_get_guint8(tvb, 0 + FCOIB_VER_OFFSET) >> 4;
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if (version != 0)
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ver = wmem_strdup_printf(wmem_packet_scope(), ver, "ver %d ", version);
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if (tvb_bytes_exist(tvb, 0, 1))
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sig = tvb_get_guint8(tvb, 0) >> 6;
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eof_str = "none";
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if (tvb_bytes_exist(tvb, eof_offset, 1)) {
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eof = tvb_get_guint8(tvb, eof_offset);
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eof_str = val_to_str(eof, fcoib_eof_vals, "0x%x");
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}
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sof_str = "none";
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if (tvb_bytes_exist(tvb, sof_offset, 1)) {
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sof = tvb_get_guint8(tvb, sof_offset);
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sof_str = val_to_str(sof, fcoib_sof_vals, "0x%x");
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}
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/*
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* Check the CRC.
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*/
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crc_msg = "";
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crc_exists = tvb_bytes_exist(tvb, crc_offset, 4);
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if (crc_exists) {
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crc = tvb_get_ntohl(tvb, crc_offset);
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crc_computed = crc32_802_tvb(next_tvb, frame_len);
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if (crc != crc_computed) {
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crc_msg = " [bad FC CRC]";
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}
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}
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len_msg = "";
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if ((frame_len % 4) != 0 || frame_len < 24) {
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len_msg = " [invalid length]";
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}
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ti = proto_tree_add_protocol_format(tree, proto_fcoib, tvb, 0,
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FCOIB_HEADER_LEN,
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"FCoIB %s(%s/%s) %d bytes%s%s", ver,
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sof_str, eof_str,
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frame_len, crc_msg,
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len_msg);
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/* Dissect the FCoIB Encapsulation header */
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fcoib_tree = proto_item_add_subtree(ti, ett_fcoib);
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proto_tree_add_uint(fcoib_tree, hf_fcoib_sig, tvb, 0, 1, sig);
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proto_tree_add_uint(fcoib_tree, hf_fcoib_ver, tvb, FCOIB_VER_OFFSET, 1, version);
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proto_tree_add_uint(fcoib_tree, hf_fcoib_sof, tvb, sof_offset, 1, sof);
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/*
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* Create the CRC information.
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*/
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if (crc_exists) {
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proto_tree_add_checksum(fcoib_tree, tvb, crc_offset, hf_fcoib_crc, hf_fcoib_crc_status, &ei_fcoib_crc, pinfo, crc_computed, ENC_BIG_ENDIAN, PROTO_CHECKSUM_VERIFY);
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proto_tree_set_appendix(fcoib_tree, tvb, crc_offset,
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tvb_captured_length_remaining (tvb, crc_offset));
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} else {
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proto_tree_add_checksum(fcoib_tree, tvb, crc_offset, hf_fcoib_crc, hf_fcoib_crc_status, &ei_fcoib_crc, pinfo, 0, ENC_BIG_ENDIAN, PROTO_CHECKSUM_NOT_PRESENT);
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}
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/*
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* Interpret the EOF.
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*/
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if (tvb_bytes_exist(tvb, eof_offset, 1)) {
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proto_tree_add_item(fcoib_tree, hf_fcoib_eof, tvb, eof_offset, 1, ENC_BIG_ENDIAN);
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}
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/* Set the SOF/EOF flags in the packet_info header */
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fc_data.sof_eof = 0;
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if (sof == FCOIB_SOFi3 || sof == FCOIB_SOFi2 || sof == FCOIB_SOFi4) {
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fc_data.sof_eof = FC_DATA_SOF_FIRST_FRAME;
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} else if (sof == FCOIB_SOFf) {
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fc_data.sof_eof = FC_DATA_SOF_SOFF;
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}
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if (eof != FCOIB_EOFn) {
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fc_data.sof_eof |= FC_DATA_EOF_LAST_FRAME;
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if (eof != FCOIB_EOFt) {
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fc_data.sof_eof |= FC_DATA_EOF_INVALID;
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}
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}
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/* Call the FC Dissector if this is carrying an FC frame */
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fc_data.ethertype = 0;
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if (fc_handle) {
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call_dissector_with_data(fc_handle, next_tvb, pinfo, tree, &fc_data);
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} else {
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call_data_dissector(next_tvb, pinfo, tree);
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}
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return tvb_captured_length(tvb);
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}
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static gboolean
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dissect_fcoib_heur(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
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{
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gint crc_offset;
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gint eof_offset;
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gint sof_offset;
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gint frame_len;
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guint8 sof = 0;
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guint8 eof = 0;
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guint8 sig = 0;
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frame_len = tvb_reported_length_remaining(tvb, 0) -
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FCOIB_HEADER_LEN - FCOIB_TRAILER_LEN;
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crc_offset = FCOIB_HEADER_LEN + frame_len;
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eof_offset = crc_offset + 4;
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sof_offset = FCOIB_HEADER_LEN - 1;
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if (frame_len <= 0)
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return FALSE; /* this packet isn't even long enough to contain the header+trailer w/o FC payload! */
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/* we start off with some basic heuristics checks to make sure this could be a FCoIB packet */
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if (tvb_bytes_exist(tvb, 0, 1))
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sig = tvb_get_guint8(tvb, 0) >> 6;
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if (tvb_bytes_exist(tvb, eof_offset, 1))
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eof = tvb_get_guint8(tvb, eof_offset);
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if (tvb_bytes_exist(tvb, sof_offset, 1))
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sof = tvb_get_guint8(tvb, sof_offset);
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if (sig != 1)
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return FALSE; /* the sig field in the FCoIB Encap. header MUST be 2'b01*/
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if (!tvb_bytes_exist(tvb, eof_offset + 1, 3) || tvb_get_ntoh24(tvb, eof_offset + 1) != 0)
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return FALSE; /* 3 bytes of RESERVED field immediately after eEOF MUST be 0 */
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if (!try_val_to_str(sof, fcoib_sof_vals))
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return FALSE; /* invalid value for SOF */
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if (!try_val_to_str(eof, fcoib_eof_vals))
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return FALSE; /* invalid value for EOF */
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dissect_fcoib(tvb, pinfo, tree, data);
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return TRUE;
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}
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void
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proto_register_fcoib(void)
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{
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module_t *fcoib_module;
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/* Setup list of header fields See Section 1.6.1 for details*/
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static hf_register_info hf[] = {
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{ &hf_fcoib_sof,
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{"SOF", "fcoib.sof", FT_UINT8, BASE_HEX, VALS(fcoib_sof_vals), 0,
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NULL, HFILL}},
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{ &hf_fcoib_eof,
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{"EOF", "fcoib.eof", FT_UINT8, BASE_HEX, VALS(fcoib_eof_vals), 0,
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NULL, HFILL}},
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{ &hf_fcoib_sig,
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{"Signature", "fcoib.sig", FT_UINT8, BASE_HEX, NULL, 0, NULL, HFILL}},
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{ &hf_fcoib_ver,
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{"Version", "fcoib.ver", FT_UINT32, BASE_DEC, NULL, 0, NULL, HFILL}},
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{ &hf_fcoib_crc,
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{"CRC", "fcoib.crc", FT_UINT32, BASE_HEX, NULL, 0, NULL, HFILL}},
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{ &hf_fcoib_crc_status,
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{"CRC Status", "fcoib.crc.status", FT_UINT8, BASE_NONE, VALS(proto_checksum_vals), 0x0,
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NULL, HFILL }},
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};
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static gint *ett[] = {
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&ett_fcoib,
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};
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static ei_register_info ei[] = {
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{ &ei_fcoib_crc, { "fcoib.crc.bad", PI_CHECKSUM, PI_ERROR, "Bad checksum", EXPFILL }},
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};
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expert_module_t* expert_fcoib;
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/* Register the protocol name and description */
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proto_fcoib = proto_register_protocol("Fibre Channel over Infiniband",
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"FCoIB", "fcoib");
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/* Required function calls to register the header fields and
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* subtrees used */
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proto_register_field_array(proto_fcoib, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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expert_fcoib = expert_register_protocol(proto_fcoib);
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expert_register_field_array(expert_fcoib, ei, array_length(ei));
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fcoib_module = prefs_register_protocol(proto_fcoib, proto_reg_handoff_fcoib);
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prefs_register_static_text_preference(fcoib_module, "use_decode_as",
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"Heuristic matching preferences removed. Use Infiniband protocol preferences or Decode As.",
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"Simple heuristics can still be enable (may generate false positives) through Infiniband protocol preferences."
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"To force FCoIB dissection use Decode As");
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prefs_register_obsolete_preference(fcoib_module, "heur_en");
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prefs_register_obsolete_preference(fcoib_module, "manual_en");
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prefs_register_obsolete_preference(fcoib_module, "addr_a");
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prefs_register_obsolete_preference(fcoib_module, "addr_a_type");
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prefs_register_obsolete_preference(fcoib_module, "addr_a_id");
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prefs_register_obsolete_preference(fcoib_module, "addr_a_qp");
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prefs_register_obsolete_preference(fcoib_module, "addr_b");
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prefs_register_obsolete_preference(fcoib_module, "addr_b_type");
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prefs_register_obsolete_preference(fcoib_module, "addr_b_id");
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prefs_register_obsolete_preference(fcoib_module, "addr_b_qp");
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}
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void
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proto_reg_handoff_fcoib(void)
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{
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heur_dissector_add("infiniband.payload", dissect_fcoib_heur, "Fibre Channel over Infiniband", "fc_infiniband", proto_fcoib, HEURISTIC_ENABLE);
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dissector_add_for_decode_as("infiniband", create_dissector_handle( dissect_fcoib, proto_fcoib ) );
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fc_handle = find_dissector_add_dependency("fc", proto_fcoib);
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}
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/*
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* Editor modelines - http://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 4
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* tab-width: 8
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* indent-tabs-mode: nil
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* End:
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*
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* vi: set shiftwidth=4 tabstop=8 expandtab:
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* :indentSize=4:tabSize=8:noTabs=true:
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*/
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