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wireshark/epan/dissectors/packet-fcp.c
Michael Mann 9b7fb8a811 Create the ability to have packet scoped "proto" data. Bug 9470 (https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=9470) 
I'm not sold on the name or module the proto_data functions live in, but I believe the function arguments are solid and gives us the most flexibility for the future.  And search/replace of a function name is easy enough to do.

The big driving force for getting this in sooner rather than later is the saved memory on ethernet packets (and IP packets soon), that used to have file_scope() proto data when all it needed was packet_scope() data (technically packet_info->pool scoped), strictly for Decode As.

All dissectors that use p_add_proto_data() only for Decode As functionality have been converted to using packet_scope().  All other dissectors were converted to using file_scope() which was the original scope for "proto" data.

svn path=/trunk/; revision=53520
2013-11-23 02:20:13 +00:00

1038 lines
34 KiB
C
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/* packet-fcp.c
* Routines for Fibre Channel Protocol for SCSI (FCP)
* Copyright 2001, Dinesh G Dutt <ddutt@cisco.com>
*
* $Id$
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include <glib.h>
#include <epan/wmem/wmem.h>
#include <epan/packet.h>
#include <epan/conversation.h>
#include <epan/etypes.h>
#include "packet-scsi.h"
#include "packet-fc.h"
#include "packet-fcp.h"
#include "packet-fcels.h"
typedef struct _fcp_proto_data_t {
guint16 lun;
} fcp_proto_data_t;
/* Initialize the protocol and registered fields */
static int proto_fcp = -1;
static int hf_fcp_multilun = -1;
static int hf_fcp_singlelun = -1;
static int hf_fcp_crn = -1;
static int hf_fcp_taskattr = -1;
static int hf_fcp_taskmgmt = -1;
static int hf_fcp_addlcdblen = -1;
static int hf_fcp_rddata = -1;
static int hf_fcp_wrdata = -1;
static int hf_fcp_dl = -1;
static int hf_fcp_bidir_dl = -1;
static int hf_fcp_data_ro = -1;
static int hf_fcp_burstlen = -1;
static int hf_fcp_rspflags = -1;
static int hf_fcp_retry_delay_timer = -1;
static int hf_fcp_resid = -1;
static int hf_fcp_bidir_resid = -1;
static int hf_fcp_snslen = -1;
static int hf_fcp_rsplen = -1;
static int hf_fcp_rspcode = -1;
static int hf_fcp_scsistatus = -1;
static int hf_fcp_type = -1;
static int hf_fcp_mgmt_flags_obsolete = -1;
static int hf_fcp_mgmt_flags_clear_aca = -1;
static int hf_fcp_mgmt_flags_target_reset = -1;
static int hf_fcp_mgmt_flags_lu_reset = -1;
static int hf_fcp_mgmt_flags_rsvd = -1;
static int hf_fcp_mgmt_flags_clear_task_set = -1;
static int hf_fcp_mgmt_flags_abort_task_set = -1;
static int hf_fcp_rsp_flags_bidi = -1;
static int hf_fcp_rsp_flags_bidi_rru = -1;
static int hf_fcp_rsp_flags_bidi_rro = -1;
static int hf_fcp_rsp_flags_conf_req = -1;
static int hf_fcp_rsp_flags_resid_under = -1;
static int hf_fcp_rsp_flags_resid_over = -1;
static int hf_fcp_rsp_flags_sns_vld = -1;
static int hf_fcp_rsp_flags_res_vld = -1;
static int hf_fcp_request_in = -1;
static int hf_fcp_response_in = -1;
static int hf_fcp_time = -1;
/* static int hf_fcp_srr_op = -1; */
static int hf_fcp_srr_ox_id = -1;
static int hf_fcp_srr_rx_id = -1;
/* static int hf_fcp_srr_r_ctl = -1; */
/* Initialize the subtree pointers */
static gint ett_fcp = -1;
static gint ett_fcp_taskmgmt = -1;
static gint ett_fcp_rsp_flags = -1;
typedef struct _fcp_conv_data_t {
wmem_tree_t *luns;
} fcp_conv_data_t;
typedef struct fcp_request_data {
guint32 request_frame;
guint32 response_frame;
nstime_t request_time;
/* XXX - keep for "backwards compatility", but not sure it really
needs to be part of the persistent data */
itl_nexus_t *itl;
} fcp_request_data_t;
static dissector_table_t fcp_dissector;
static dissector_handle_t data_handle;
/* Information Categories based on lower 4 bits of R_CTL */
#define FCP_IU_DATA 0x1
#define FCP_IU_UNSOL_CTL 0x2
#define FCP_IU_SOL_CTL 0x3
#define FCP_IU_CONFIRM 0x3
#define FCP_IU_XFER_RDY 0x5
#define FCP_IU_CMD 0x6
#define FCP_IU_RSP 0x7
static const value_string fcp_iu_val[] = {
{FCP_IU_DATA , "FCP_DATA"},
{FCP_IU_UNSOL_CTL , "Control"},
{FCP_IU_CONFIRM , "Confirm"},
{FCP_IU_XFER_RDY , "XFER_RDY"},
{FCP_IU_CMD , "FCP_CMND"},
{FCP_IU_RSP , "FCP_RSP"},
{0, NULL},
};
/* Task Attribute Values */
static const value_string fcp_task_attr_val[] = {
{0, "Simple"},
{1, "Head of Queue"},
{2, "Ordered"},
{4, "ACA"},
{5, "Untagged"},
{0, NULL},
};
/* RSP Code Definitions (from FCP_RSP_INFO) */
static const value_string fcp_rsp_code_val[] = {
{0, "Task Management Function Complete"},
{1, "FCP_DATA length Different from FCP_BURST_LEN"},
{2, "FCP_CMND Fields Invalid"},
{3, "FCP_DATA Parameter Mismatch With FCP_DATA_RO"},
{4, "Task Management Function Rejected"},
{5, "Task Management Function Failed"},
{9, "Task Management Function Incorrect LUN"},
{0, NULL},
};
static const true_false_string fcp_mgmt_flags_obsolete_tfs = {
"OBSOLETE BIT is SET",
"OBSOLETE BIT is NOT set",
};
static const true_false_string fcp_mgmt_flags_clear_aca_tfs = {
"CLEAR ACA is SET",
"Clear aca is NOT set",
};
static const true_false_string fcp_mgmt_flags_target_reset_tfs = {
"TARGET RESET is SET",
"Target reset is NOT set",
};
static const true_false_string fcp_mgmt_flags_lu_reset_tfs = {
"LU RESET is SET",
"Lu reset is NOT set",
};
static const true_false_string fcp_mgmt_flags_rsvd_tfs = {
"RSVD is SET",
"Rsvd is NOT set",
};
static const true_false_string fcp_mgmt_flags_clear_task_set_tfs = {
"CLEAR TASK SET is SET",
"Clear task set is NOT set",
};
static const true_false_string fcp_mgmt_flags_abort_task_set_tfs = {
"ABORT TASK SET is SET",
"Abort task set is NOT set",
};
static void
dissect_task_mgmt_flags(packet_info *pinfo, proto_tree *parent_tree, tvbuff_t *tvb, int offset)
{
proto_item *item = NULL;
proto_tree *tree = NULL;
guint8 flags;
if (parent_tree) {
item = proto_tree_add_item(parent_tree, hf_fcp_taskmgmt, tvb, offset, 1, ENC_LITTLE_ENDIAN);
tree = proto_item_add_subtree(item, ett_fcp_taskmgmt);
}
flags = tvb_get_guint8(tvb, offset);
if (!flags)
proto_item_append_text(item, " (No values set)");
proto_tree_add_boolean(tree, hf_fcp_mgmt_flags_obsolete, tvb, offset, 1, flags);
if (flags & 0x80) {
proto_item_append_text(item, " OBSOLETE");
col_prepend_fence_fstr(pinfo->cinfo, COL_INFO, "[FCP OBSOLETE] ");
}
flags &= (~( 0x80 ));
proto_tree_add_boolean(tree, hf_fcp_mgmt_flags_clear_aca, tvb, offset, 1, flags);
if (flags & 0x40) {
proto_item_append_text(item, " CLEAR ACA");
col_prepend_fence_fstr(pinfo->cinfo, COL_INFO, "[FCP CLEAR_ACA] ");
}
flags &= (~( 0x40 ));
proto_tree_add_boolean(tree, hf_fcp_mgmt_flags_target_reset, tvb, offset, 1, flags);
if (flags & 0x20) {
proto_item_append_text(item, " TARGET RESET");
col_prepend_fence_fstr(pinfo->cinfo, COL_INFO, "[FCP TARGET_RESET] ");
}
flags &= (~( 0x20 ));
proto_tree_add_boolean(tree, hf_fcp_mgmt_flags_lu_reset, tvb, offset, 1, flags);
if (flags & 0x10) {
proto_item_append_text(item, " LU RESET");
col_prepend_fence_fstr(pinfo->cinfo, COL_INFO, "[FCP LU_RESET] ");
}
flags &= (~( 0x10 ));
proto_tree_add_boolean(tree, hf_fcp_mgmt_flags_rsvd, tvb, offset, 1, flags);
if (flags & 0x08) {
proto_item_append_text(item, " RSVD");
col_prepend_fence_fstr(pinfo->cinfo, COL_INFO, "[FCP RSVD] ");
}
flags &= (~( 0x08 ));
proto_tree_add_boolean(tree, hf_fcp_mgmt_flags_clear_task_set, tvb, offset, 1, flags);
if (flags & 0x04) {
proto_item_append_text(item, " CLEAR TASK SET");
col_prepend_fence_fstr(pinfo->cinfo, COL_INFO, "[FCP CLEAR_TASK_SET] ");
}
flags &= (~( 0x04 ));
proto_tree_add_boolean(tree, hf_fcp_mgmt_flags_abort_task_set, tvb, offset, 1, flags);
if (flags & 0x02) {
proto_item_append_text(item, " ABORT TASK SET");
col_prepend_fence_fstr(pinfo->cinfo, COL_INFO, "[FCP ABORT_TASK_SET] ");
}
flags &= (~( 0x02 ));
if (flags) {
proto_item_append_text(item, " Unknown bitmap value 0x%x", flags);
}
}
static const true_false_string fcp_rsp_flags_bidi_tfs = {
"Bidirectional residual fields are PRESENT",
"Bidirectional residual fields are NOT present",
};
static const true_false_string fcp_rsp_flags_bidi_rru_tfs = {
"Bidirectional residual underflow is PRESENT",
"Bidirectional residual underflow is NOT present",
};
static const true_false_string fcp_rsp_flags_bidi_rro_tfs = {
"Bidirectional residual overflow is PRESENT",
"Bidirectional residual overflow is NOT present",
};
static const true_false_string fcp_rsp_flags_conf_req_tfs = {
"CONF REQ is SET",
"Conf req set is NOT set",
};
static const true_false_string fcp_rsp_flags_resid_under_tfs = {
"RESID UNDER is SET",
"Resid under is NOT set",
};
static const true_false_string fcp_rsp_flags_resid_over_tfs = {
"RESID OVER is SET",
"Resid over is NOT set",
};
static const true_false_string fcp_rsp_flags_sns_vld_tfs = {
"SNS VLD is SET",
"Sns vld is NOT set",
};
static const true_false_string fcp_rsp_flags_res_vld_tfs = {
"RES VLD is SET",
"Res vld is NOT set",
};
static void
dissect_rsp_flags(proto_tree *parent_tree, tvbuff_t *tvb, int offset)
{
proto_item *item = NULL;
proto_tree *tree = NULL;
gboolean bidi_resid_present = FALSE;
guint8 flags;
if (parent_tree) {
item = proto_tree_add_item(parent_tree, hf_fcp_rspflags, tvb, offset, 1, ENC_LITTLE_ENDIAN);
tree = proto_item_add_subtree(item, ett_fcp_rsp_flags);
}
flags = tvb_get_guint8(tvb, offset);
if (!flags)
proto_item_append_text(item, " (No values set)");
/* BIDI RSP */
proto_tree_add_boolean(tree, hf_fcp_rsp_flags_bidi, tvb, offset, 1, flags);
if (flags & 0x80) {
bidi_resid_present = TRUE;
proto_item_append_text(item, " BIDI_RSP");
if (flags & (~( 0x80 )))
proto_item_append_text(item, ",");
}
flags &= (~( 0x80 ));
/* these two bits are only defined if the bidi bit is set */
if (bidi_resid_present) {
/* BIDI READ RESID UNDER */
proto_tree_add_boolean(tree, hf_fcp_rsp_flags_bidi_rru, tvb, offset, 1, flags);
if (flags & 0x40) {
proto_item_append_text(item, " BIDI_RRU");
if (flags & (~( 0x40 )))
proto_item_append_text(item, ",");
}
flags &= (~( 0x40 ));
/* BIDI READ RESID OVER */
proto_tree_add_boolean(tree, hf_fcp_rsp_flags_bidi_rro, tvb, offset, 1, flags);
if (flags & 0x20) {
proto_item_append_text(item, " BIDI_RRO");
if (flags & (~( 0x20 )))
proto_item_append_text(item, ",");
}
flags &= (~( 0x20 ));
}
/* Conf Req */
proto_tree_add_boolean(tree, hf_fcp_rsp_flags_conf_req, tvb, offset, 1, flags);
if (flags & 0x10) {
proto_item_append_text(item, " CONF REQ");
if (flags & (~( 0x10 )))
proto_item_append_text(item, ",");
}
flags &= (~( 0x10 ));
/* Resid Under */
proto_tree_add_boolean(tree, hf_fcp_rsp_flags_resid_under, tvb, offset, 1, flags);
if (flags & 0x08) {
proto_item_append_text(item, " RESID UNDER");
if (flags & (~( 0x08 )))
proto_item_append_text(item, ",");
}
flags &= (~( 0x08 ));
/* Resid Over */
proto_tree_add_boolean(tree, hf_fcp_rsp_flags_resid_over, tvb, offset, 1, flags);
if (flags & 0x04) {
proto_item_append_text(item, " RESID OVER");
if (flags & (~( 0x04 )))
proto_item_append_text(item, ",");
}
flags &= (~( 0x04 ));
/* SNS len valid */
proto_tree_add_boolean(tree, hf_fcp_rsp_flags_sns_vld, tvb, offset, 1, flags);
if (flags & 0x02) {
proto_item_append_text(item, " SNS VLD");
if (flags & (~( 0x02 )))
proto_item_append_text(item, ",");
}
flags &= (~( 0x02 ));
/* rsp len valid */
proto_tree_add_boolean(tree, hf_fcp_rsp_flags_res_vld, tvb, offset, 1, flags);
if (flags & 0x01) {
proto_item_append_text(item, " RES VLD");
if (flags & (~( 0x01 )))
proto_item_append_text(item, ",");
}
flags &= (~( 0x01 ));
if (flags) {
proto_item_append_text(item, " Unknown bitmap value 0x%x", flags);
}
}
static void
dissect_fcp_cmnd(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, proto_tree *tree, conversation_t *conversation, fc_hdr *fchdr, fcp_conv_data_t *fcp_conv_data)
{
int offset = 0;
int add_len = 0;
guint8 flags, rwflags, lun0;
guint16 lun = 0xffff;
tvbuff_t *cdb_tvb;
int tvb_len, tvb_rlen;
fcp_request_data_t *request_data = NULL;
proto_item *hidden_item;
fcp_proto_data_t *proto_data;
/* Determine the length of the FCP part of the packet */
flags = tvb_get_guint8(tvb, offset+10);
if (flags) {
add_len = tvb_get_guint8(tvb, offset+11) & 0x7C;
add_len = add_len >> 2;
}
hidden_item = proto_tree_add_uint(tree, hf_fcp_type, tvb, offset, 0, 0);
PROTO_ITEM_SET_HIDDEN(hidden_item);
lun0 = tvb_get_guint8(tvb, offset);
/* Display single-level LUNs in decimal for clarity */
/* I'm taking a shortcut here by assuming that if the first byte of the
* LUN field is 0, it is a single-level LUN. This is not true. For a
* real single-level LUN, all 8 bytes except byte 1 must be 0.
*/
if (lun0) {
proto_tree_add_item(tree, hf_fcp_multilun, tvb, offset, 8, ENC_NA);
lun = tvb_get_guint8(tvb, offset) & 0x3f;
lun <<= 8;
lun |= tvb_get_guint8(tvb, offset+1);
} else {
proto_tree_add_item(tree, hf_fcp_singlelun, tvb, offset+1,
1, ENC_BIG_ENDIAN);
lun = tvb_get_guint8(tvb, offset+1);
}
if (fchdr->itlq)
fchdr->itlq->lun = lun;
if (!pinfo->fd->flags.visited) {
proto_data = wmem_new(wmem_file_scope(), fcp_proto_data_t);
proto_data->lun = lun;
p_add_proto_data(wmem_file_scope(), pinfo, proto_fcp, 0, proto_data);
}
request_data = (fcp_request_data_t*)wmem_tree_lookup32(fcp_conv_data->luns, lun);
if (!request_data) {
request_data = wmem_new(wmem_file_scope(), fcp_request_data_t);
request_data->request_frame = pinfo->fd->num;
request_data->response_frame = 0;
request_data->request_time = pinfo->fd->abs_ts;
request_data->itl = wmem_new(wmem_file_scope(), itl_nexus_t);
request_data->itl->cmdset = 0xff;
request_data->itl->conversation = conversation;
wmem_tree_insert32(fcp_conv_data->luns, lun, request_data);
}
proto_tree_add_item(tree, hf_fcp_crn, tvb, offset+8, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(tree, hf_fcp_taskattr, tvb, offset+9, 1, ENC_BIG_ENDIAN);
dissect_task_mgmt_flags(pinfo, tree, tvb, offset+10);
proto_tree_add_item(tree, hf_fcp_addlcdblen, tvb, offset+11, 1, ENC_BIG_ENDIAN);
rwflags = tvb_get_guint8(tvb, offset+11);
if (fchdr->itlq) {
if (rwflags & 0x02) {
fchdr->itlq->task_flags |= SCSI_DATA_READ;
}
if (rwflags & 0x01) {
fchdr->itlq->task_flags |= SCSI_DATA_WRITE;
}
}
proto_tree_add_item(tree, hf_fcp_rddata, tvb, offset+11, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(tree, hf_fcp_wrdata, tvb, offset+11, 1, ENC_BIG_ENDIAN);
tvb_len = tvb_length_remaining(tvb, offset+12);
if (tvb_len > (16 + add_len))
tvb_len = 16 + add_len;
tvb_rlen = tvb_reported_length_remaining(tvb, offset+12);
if (tvb_rlen > (16 + add_len))
tvb_rlen = 16 + add_len;
cdb_tvb = tvb_new_subset(tvb, offset+12, tvb_len, tvb_rlen);
dissect_scsi_cdb(cdb_tvb, pinfo, parent_tree, SCSI_DEV_UNKNOWN, fchdr->itlq, request_data->itl);
proto_tree_add_item(tree, hf_fcp_dl, tvb, offset+12+16+add_len,
4, ENC_BIG_ENDIAN);
if (fchdr->itlq) {
fchdr->itlq->data_length = tvb_get_ntohl(tvb, offset+12+16+add_len);
}
if ( ((rwflags & 0x03) == 0x03)
&& tvb_length_remaining(tvb, offset+12+16+add_len+4) >= 4) {
proto_tree_add_item(tree, hf_fcp_bidir_dl, tvb, offset+12+16+add_len+4,
4, ENC_BIG_ENDIAN);
if (fchdr->itlq) {
fchdr->itlq->bidir_data_length = tvb_get_ntohl(tvb, offset+12+16+add_len+4);
}
}
}
static void
dissect_fcp_data(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, conversation_t *conversation _U_, fc_hdr *fchdr, itl_nexus_t *itl)
{
dissect_scsi_payload(tvb, pinfo, parent_tree, FALSE, fchdr->itlq, itl, fchdr->relative_offset);
}
/* fcp-3 9.5 table 24 */
static int
dissect_fcp_rspinfo(tvbuff_t *tvb, proto_tree *tree, int offset)
{
/* 3 reserved bytes */
offset += 3;
/* rsp code */
proto_tree_add_item(tree, hf_fcp_rspcode, tvb, offset, 1, ENC_BIG_ENDIAN);
offset += 1;
/* 4 reserved bytes */
offset += 4;
return offset;
}
static void
dissect_fcp_rsp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, proto_tree *tree, conversation_t *conversation _U_, fc_hdr *fchdr, fcp_request_data_t *request_data)
{
guint32 offset = 0;
gint32 snslen = 0;
gint32 rsplen = 0;
guint8 flags;
guint8 status;
proto_item *hidden_item;
status = tvb_get_guint8(tvb, offset+11);
col_append_fstr(pinfo->cinfo, COL_INFO, ":%s",
val_to_str(status, scsi_status_val, "0x%x"));
/* Save the response frame */
if (request_data != NULL)
request_data->response_frame = pinfo->fd->num;
hidden_item = proto_tree_add_uint(tree, hf_fcp_type, tvb, offset, 0, 0);
PROTO_ITEM_SET_HIDDEN(hidden_item);
/* 8 reserved bytes */
offset += 8;
/* retry delay timer */
proto_tree_add_item(tree, hf_fcp_retry_delay_timer, tvb, offset, 2, ENC_BIG_ENDIAN);
offset += 2;
/* flags */
flags = tvb_get_guint8(tvb, offset);
dissect_rsp_flags(tree, tvb, offset);
offset += 1;
/* scsi status code */
proto_tree_add_item(tree, hf_fcp_scsistatus, tvb, offset, 1, ENC_BIG_ENDIAN);
dissect_scsi_rsp(tvb, pinfo, parent_tree, fchdr->itlq, (request_data != NULL) ? request_data->itl : NULL, tvb_get_guint8(tvb, offset));
offset += 1;
/* residual count */
if (flags & 0x0e) {
proto_tree_add_item(tree, hf_fcp_resid, tvb, offset, 4, ENC_BIG_ENDIAN);
}
offset += 4;
/* sense length */
if (flags & 0x2) {
snslen = tvb_get_ntohl(tvb, offset);
proto_tree_add_uint(tree, hf_fcp_snslen, tvb, offset, 4,
snslen);
}
offset += 4;
/* response length */
if (flags & 0x1) {
rsplen = tvb_get_ntohl(tvb, offset);
proto_tree_add_uint(tree, hf_fcp_rsplen, tvb, offset, 4,
rsplen);
}
offset += 4;
/* rsp_info */
if (rsplen) {
tvbuff_t *rspinfo_tvb;
rspinfo_tvb = tvb_new_subset(tvb, offset, MIN(rsplen, tvb_length_remaining(tvb, offset)), rsplen);
dissect_fcp_rspinfo(rspinfo_tvb, tree, 0);
offset += rsplen;
}
/* sense info */
if (snslen) {
tvbuff_t *sns_tvb;
sns_tvb = tvb_new_subset(tvb, offset, MIN(snslen, tvb_length_remaining(tvb, offset)), snslen);
dissect_scsi_snsinfo(sns_tvb, pinfo, parent_tree, 0,
snslen,
fchdr->itlq, (request_data != NULL) ? request_data->itl : NULL);
offset += snslen;
}
/* bidir read resid (only present for bidirectional responses) */
if (flags & 0x80) {
if (flags & 0x60) {
proto_tree_add_item(tree, hf_fcp_bidir_resid, tvb, offset, 4, ENC_BIG_ENDIAN);
}
/*offset += 4;*/
}
}
static void
dissect_fcp_xfer_rdy(tvbuff_t *tvb, proto_tree *tree)
{
int offset = 0;
proto_item *hidden_item;
hidden_item = proto_tree_add_uint(tree, hf_fcp_type, tvb, offset, 0, 0);
PROTO_ITEM_SET_HIDDEN(hidden_item);
proto_tree_add_item(tree, hf_fcp_data_ro, tvb, offset, 4, ENC_BIG_ENDIAN);
proto_tree_add_item(tree, hf_fcp_burstlen, tvb, offset+4, 4, ENC_BIG_ENDIAN);
}
static void
dissect_fcp_srr(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
guint8 r_ctl;
r_ctl = pinfo->r_ctl & 0xf;
if (r_ctl == FCP_IU_UNSOL_CTL) { /* request */
proto_tree_add_item(tree, hf_fcp_srr_ox_id, tvb, 4, 2, ENC_BIG_ENDIAN);
proto_tree_add_item(tree, hf_fcp_srr_rx_id, tvb, 6, 2, ENC_BIG_ENDIAN);
proto_tree_add_item(tree, hf_fcp_data_ro, tvb, 8, 4, ENC_BIG_ENDIAN);
r_ctl = tvb_get_guint8(tvb, 12);
proto_tree_add_text(tree, tvb, 12, 1, "R_CTL: %s",
val_to_str(r_ctl, fcp_iu_val, "0x%02x"));
}
}
static const value_string fcp_els_iu_val[] = {
{FCP_IU_UNSOL_CTL , "FCP ELS Request"},
{FCP_IU_SOL_CTL , "FCP ELS Response"},
{0, NULL},
};
/*
* Dissect FC-4 ELS for FCP.
*/
static void
dissect_fcp_els(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
guint8 op;
op = tvb_get_guint8(tvb, 0);
col_add_str(pinfo->cinfo, COL_INFO, val_to_str(op, fc_els_proto_val, "0x%x"));
proto_tree_add_text(tree, tvb, 0, 1, "Opcode: %s",
val_to_str(op, fc_els_proto_val,
"ELS 0x%02x"));
switch (op) { /* XXX should switch based on conv for LS_ACC */
case FC_ELS_SRR:
dissect_fcp_srr(tvb, pinfo, tree);
break;
default:
call_dissector(data_handle, tvb, pinfo, tree);
break;
}
}
static int
dissect_fcp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data)
{
proto_item *ti = NULL;
proto_tree *fcp_tree = NULL;
fc_hdr *fchdr;
guint8 r_ctl;
conversation_t *fc_conv;
fcp_conv_data_t *fcp_conv_data = NULL;
fcp_request_data_t *request_data = NULL;
gboolean els;
fcp_proto_data_t *proto_data;
fchdr = (fc_hdr *)data;
/* Make entries in Protocol column and Info column on summary display */
col_set_str(pinfo->cinfo, COL_PROTOCOL, "FCP");
r_ctl = pinfo->r_ctl;
els = (r_ctl & 0xf0) == FC_RCTL_LINK_DATA;
r_ctl &= 0xF;
col_add_str(pinfo->cinfo, COL_INFO,
val_to_str(r_ctl, els ? fcp_els_iu_val : fcp_iu_val,
"0x%x"));
ti = proto_tree_add_protocol_format(tree, proto_fcp, tvb, 0, -1,
"FCP: %s",
val_to_str(r_ctl,
els ? fcp_els_iu_val :
fcp_iu_val, "Unknown 0x%02x"));
fcp_tree = proto_item_add_subtree(ti, ett_fcp);
fc_conv = find_conversation(pinfo->fd->num, &pinfo->src, &pinfo->dst,
pinfo->ptype, pinfo->srcport,
pinfo->destport, 0);
if (fc_conv != NULL) {
fcp_conv_data = (fcp_conv_data_t *)conversation_get_proto_data(fc_conv, proto_fcp);
}
if (!fcp_conv_data) {
fcp_conv_data = wmem_new(wmem_file_scope(), fcp_conv_data_t);
fcp_conv_data->luns = wmem_tree_new(wmem_file_scope());
conversation_add_proto_data(fc_conv, proto_fcp, fcp_conv_data);
}
/* Lun is only populated by FCP_IU_CMD, and subsequent packets assume the same lun.
The only way that consistently works is to save the lun on the first pass when packets
are guaranteed to be parsed consecutively */
if (!pinfo->fd->flags.visited) {
proto_data = wmem_new(wmem_file_scope(), fcp_proto_data_t);
proto_data->lun = fchdr->itlq->lun;
p_add_proto_data(wmem_file_scope(), pinfo, proto_fcp, 0, proto_data);
} else {
proto_data = (fcp_proto_data_t *)p_get_proto_data(wmem_file_scope(), pinfo, proto_fcp, 0);
fchdr->itlq->lun = proto_data->lun;
}
if ((r_ctl != FCP_IU_CMD) && (r_ctl != FCP_IU_UNSOL_CTL)) {
request_data = (fcp_request_data_t *)wmem_tree_lookup32(fcp_conv_data->luns, fchdr->itlq->lun);
}
/* put a request_in in all frames except the command frame */
if ((r_ctl != FCP_IU_CMD) && (r_ctl != FCP_IU_UNSOL_CTL) &&
(fchdr->itlq->first_exchange_frame)) {
proto_item *it;
it = proto_tree_add_uint(fcp_tree, hf_fcp_singlelun, tvb, 0, 0, fchdr->itlq->lun);
PROTO_ITEM_SET_GENERATED(it);
if (request_data != NULL) {
it = proto_tree_add_uint(fcp_tree, hf_fcp_request_in, tvb, 0, 0, request_data->request_frame);
PROTO_ITEM_SET_GENERATED(it);
/* only put the response time in the actual response frame */
if (r_ctl == FCP_IU_RSP) {
nstime_t delta_ts;
nstime_delta(&delta_ts, &pinfo->fd->abs_ts, &request_data->request_time);
it = proto_tree_add_time(ti, hf_fcp_time, tvb, 0, 0, &delta_ts);
PROTO_ITEM_SET_GENERATED(it);
}
}
}
/* put a response_in in all frames except the response frame */
if ((r_ctl != FCP_IU_RSP) && (r_ctl != FCP_IU_SOL_CTL) &&
(request_data != NULL) && (request_data->response_frame)) {
proto_item *it;
it = proto_tree_add_uint(fcp_tree, hf_fcp_response_in, tvb, 0, 0, request_data->response_frame);
PROTO_ITEM_SET_GENERATED(it);
}
if (els) {
dissect_fcp_els(tvb, pinfo, fcp_tree);
return tvb_length(tvb);
}
switch (r_ctl) {
case FCP_IU_DATA:
dissect_fcp_data(tvb, pinfo, tree, fc_conv, fchdr, (request_data != NULL) ? request_data->itl : NULL);
break;
case FCP_IU_CONFIRM:
/* Nothing to be done here */
break;
case FCP_IU_XFER_RDY:
dissect_fcp_xfer_rdy(tvb, fcp_tree);
break;
case FCP_IU_CMD:
dissect_fcp_cmnd(tvb, pinfo, tree, fcp_tree, fc_conv, fchdr, fcp_conv_data);
break;
case FCP_IU_RSP:
dissect_fcp_rsp(tvb, pinfo, tree, fcp_tree, fc_conv, fchdr, request_data);
break;
default:
call_dissector(data_handle, tvb, pinfo, tree);
break;
}
/*xxx once the subdissectors return bytes consumed: proto_item_set_end(ti, tvb, offset);*/
return tvb_length(tvb);
}
/* Register the protocol with Wireshark */
void
proto_register_fcp(void)
{
/* Setup list of header fields See Section 1.6.1 for details*/
static hf_register_info hf[] = {
{ &hf_fcp_type,
{"Field to branch off to SCSI", "fcp.type",
FT_UINT8, BASE_HEX, NULL, 0x0,
NULL, HFILL}},
{ &hf_fcp_multilun,
{"Multi-Level LUN", "fcp.multilun",
FT_BYTES, BASE_NONE, NULL, 0x0,
NULL, HFILL}},
{ &hf_fcp_singlelun,
{"LUN", "fcp.lun",
FT_UINT8, BASE_HEX, NULL, 0x0,
NULL, HFILL}},
{ &hf_fcp_crn,
{"Command Ref Num", "fcp.crn",
FT_UINT8, BASE_DEC, NULL, 0x0,
NULL, HFILL}},
{ &hf_fcp_taskattr,
{"Task Attribute", "fcp.taskattr",
FT_UINT8, BASE_HEX, VALS(fcp_task_attr_val), 0x7,
NULL, HFILL}},
{ &hf_fcp_taskmgmt,
{"Task Management Flags", "fcp.taskmgmt",
FT_UINT8, BASE_HEX, NULL, 0x0,
NULL, HFILL}},
{ &hf_fcp_addlcdblen,
{"Additional CDB Length", "fcp.addlcdblen",
FT_UINT8, BASE_DEC, NULL, 0xFC,
NULL, HFILL}},
{ &hf_fcp_rddata,
{"RDDATA", "fcp.rddata",
FT_BOOLEAN, 8, NULL, 0x02,
NULL, HFILL}},
{ &hf_fcp_wrdata,
{"WRDATA", "fcp.wrdata",
FT_BOOLEAN, 8, NULL, 0x01,
NULL, HFILL}},
{ &hf_fcp_dl,
{"FCP_DL", "fcp.dl",
FT_UINT32, BASE_DEC, NULL, 0x0,
NULL, HFILL}},
{ &hf_fcp_bidir_dl,
{"FCP_BIDIRECTIONAL_READ_DL", "fcp.bidir_dl",
FT_UINT32, BASE_DEC, NULL, 0x0,
NULL, HFILL}},
{ &hf_fcp_data_ro,
{"FCP_DATA_RO", "fcp.data_ro",
FT_UINT32, BASE_DEC, NULL, 0x0,
NULL, HFILL}},
{ &hf_fcp_burstlen,
{"Burst Length", "fcp.burstlen",
FT_UINT32, BASE_DEC, NULL, 0x0,
NULL, HFILL}},
{ &hf_fcp_retry_delay_timer,
{"Retry Delay Timer", "fcp.rsp.retry_delay_timer",
FT_UINT16, BASE_DEC, NULL, 0x0,
NULL, HFILL}},
{ &hf_fcp_rspflags,
{"FCP_RSP Flags", "fcp.rspflags",
FT_UINT8, BASE_HEX, NULL, 0x0,
NULL, HFILL}},
{ &hf_fcp_resid,
{"FCP_RESID", "fcp.resid",
FT_UINT32, BASE_DEC, NULL, 0x0,
NULL, HFILL}},
{ &hf_fcp_bidir_resid,
{"Bidirectional Read Resid", "fcp.bidir_resid",
FT_UINT32, BASE_DEC, NULL, 0x0,
NULL, HFILL}},
{ &hf_fcp_snslen,
{"FCP_SNS_LEN", "fcp.snslen",
FT_UINT32, BASE_DEC, NULL, 0x0,
NULL, HFILL}},
{ &hf_fcp_rsplen,
{"FCP_RSP_LEN", "fcp.rsplen",
FT_UINT32, BASE_DEC, NULL, 0x0,
NULL, HFILL}},
{ &hf_fcp_rspcode,
{"RSP_CODE", "fcp.rspcode",
FT_UINT8, BASE_HEX, VALS(fcp_rsp_code_val), 0x0,
NULL, HFILL}},
{ &hf_fcp_scsistatus,
{"SCSI Status", "fcp.status",
FT_UINT8, BASE_HEX, VALS(scsi_status_val), 0x0,
NULL, HFILL}},
{ &hf_fcp_mgmt_flags_obsolete,
{ "Obsolete", "fcp.mgmt.flags.obsolete",
FT_BOOLEAN, 8, TFS(&fcp_mgmt_flags_obsolete_tfs), 0x80,
NULL, HFILL }},
{ &hf_fcp_mgmt_flags_clear_aca,
{ "Clear ACA", "fcp.mgmt.flags.clear_aca",
FT_BOOLEAN, 8, TFS(&fcp_mgmt_flags_clear_aca_tfs), 0x40,
NULL, HFILL }},
{ &hf_fcp_mgmt_flags_target_reset,
{ "Target Reset", "fcp.mgmt.flags.target_reset",
FT_BOOLEAN, 8, TFS(&fcp_mgmt_flags_target_reset_tfs), 0x20,
NULL, HFILL }},
{ &hf_fcp_mgmt_flags_lu_reset,
{ "LU Reset", "fcp.mgmt.flags.lu_reset",
FT_BOOLEAN, 8, TFS(&fcp_mgmt_flags_lu_reset_tfs), 0x10,
NULL, HFILL }},
{ &hf_fcp_mgmt_flags_rsvd,
{ "Rsvd", "fcp.mgmt.flags.rsvd",
FT_BOOLEAN, 8, TFS(&fcp_mgmt_flags_rsvd_tfs), 0x08,
NULL, HFILL }},
{ &hf_fcp_mgmt_flags_clear_task_set,
{ "Clear Task Set", "fcp.mgmt.flags.clear_task_set",
FT_BOOLEAN, 8, TFS(&fcp_mgmt_flags_clear_task_set_tfs), 0x04,
NULL, HFILL }},
{ &hf_fcp_mgmt_flags_abort_task_set,
{ "Abort Task Set", "fcp.mgmt.flags.abort_task_set",
FT_BOOLEAN, 8, TFS(&fcp_mgmt_flags_abort_task_set_tfs), 0x02,
NULL, HFILL }},
{ &hf_fcp_rsp_flags_bidi,
{ "Bidi Rsp", "fcp.rsp.flags.bidi",
FT_BOOLEAN, 8, TFS(&fcp_rsp_flags_bidi_tfs), 0x80,
NULL, HFILL }},
{ &hf_fcp_rsp_flags_bidi_rru,
{ "Bidi Read Resid Under", "fcp.rsp.flags.bidi_rru",
FT_BOOLEAN, 8, TFS(&fcp_rsp_flags_bidi_rru_tfs), 0x40,
NULL, HFILL }},
{ &hf_fcp_rsp_flags_bidi_rro,
{ "Bidi Read Resid Over", "fcp.rsp.flags.bidi_rro",
FT_BOOLEAN, 8, TFS(&fcp_rsp_flags_bidi_rro_tfs), 0x20,
NULL, HFILL }},
{ &hf_fcp_rsp_flags_conf_req,
{ "Conf Req", "fcp.rsp.flags.conf_req",
FT_BOOLEAN, 8, TFS(&fcp_rsp_flags_conf_req_tfs), 0x10,
NULL, HFILL }},
{ &hf_fcp_rsp_flags_resid_under,
{ "Resid Under", "fcp.rsp.flags.resid_under",
FT_BOOLEAN, 8, TFS(&fcp_rsp_flags_resid_under_tfs), 0x08,
NULL, HFILL }},
{ &hf_fcp_rsp_flags_resid_over,
{ "Resid Over", "fcp.rsp.flags.resid_over",
FT_BOOLEAN, 8, TFS(&fcp_rsp_flags_resid_over_tfs), 0x04,
NULL, HFILL }},
{ &hf_fcp_rsp_flags_sns_vld,
{ "SNS Vld", "fcp.rsp.flags.sns_vld",
FT_BOOLEAN, 8, TFS(&fcp_rsp_flags_sns_vld_tfs), 0x02,
NULL, HFILL }},
{ &hf_fcp_rsp_flags_res_vld,
{ "RES Vld", "fcp.rsp.flags.res_vld",
FT_BOOLEAN, 8, TFS(&fcp_rsp_flags_res_vld_tfs), 0x01,
NULL, HFILL }},
{ &hf_fcp_request_in,
{ "Request In", "fcp.request_in",
FT_FRAMENUM, BASE_NONE, NULL, 0,
"The frame number for the request", HFILL }},
{ &hf_fcp_response_in,
{ "Response In", "fcp.response_in",
FT_FRAMENUM, BASE_NONE, NULL, 0,
"The frame number of the response", HFILL }},
{ &hf_fcp_time,
{ "Time from FCP_CMND", "fcp.time",
FT_RELATIVE_TIME, BASE_NONE, NULL, 0,
"Time since the FCP_CMND frame", HFILL }},
#if 0
{ &hf_fcp_srr_op,
{"Opcode", "fcp.els.op",
FT_UINT8, BASE_HEX, NULL, 0x0,
NULL, HFILL}},
#endif
{ &hf_fcp_srr_ox_id,
{"OX_ID", "fcp.els.srr.ox_id",
FT_UINT16, BASE_HEX, NULL, 0x0,
NULL, HFILL}},
{ &hf_fcp_srr_rx_id,
{"RX_ID", "fcp.els.srr.rx_id",
FT_UINT16, BASE_HEX, NULL, 0x0,
NULL, HFILL}},
#if 0
{ &hf_fcp_srr_r_ctl,
{"R_CTL", "fcp.els.srr.r_ctl",
FT_UINT8, BASE_HEX, NULL, 0x0,
NULL, HFILL}},
#endif
};
/* Setup protocol subtree array */
static gint *ett[] = {
&ett_fcp,
&ett_fcp_taskmgmt,
&ett_fcp_rsp_flags,
};
/* Register the protocol name and description */
proto_fcp = proto_register_protocol("Fibre Channel Protocol for SCSI",
"FCP", "fcp");
/* Required function calls to register the header fields and subtrees used */
proto_register_field_array(proto_fcp, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
fcp_dissector = register_dissector_table("fcp.type", "FCP Type", FT_UINT8,
BASE_HEX);
}
void
proto_reg_handoff_fcp(void)
{
dissector_handle_t fcp_handle;
fcp_handle = new_create_dissector_handle(dissect_fcp, proto_fcp);
dissector_add_uint("fc.ftype", FC_FTYPE_SCSI, fcp_handle);
data_handle = find_dissector("data");
}
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