![Guy Harris](/assets/img/avatar_default.png)
keys to have _uint in their names, to match the routines that handle dissector tables with string keys. (Using _port can confuse people into thinking they're intended solely for use with TCP/UDP/etc. ports when, in fact, they work better for things such as Ethernet types, where the binding of particular values to particular protocols are a lot stronger.) svn path=/trunk/; revision=35224
811 lines
24 KiB
C
811 lines
24 KiB
C
/* packet-flip.c
|
|
* Routines for FLIP packet dissection
|
|
*
|
|
* Copyright 2009, Juha Siltanen <juha.siltanen@nsn.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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
|
|
*/
|
|
|
|
/*
|
|
* FLIP (Flow Layer Internal Protocol) is a proprietary protocol
|
|
* developed by Nokia Siemens Networks.
|
|
*/
|
|
|
|
/*
|
|
* Version information
|
|
*
|
|
* Version 0.0.1, November 23rd, 2009.
|
|
*
|
|
* Support for the basic and checksum headers.
|
|
*
|
|
* Version 0.0.2, August 26th, 2010.
|
|
*
|
|
* Support for payload dissecting.
|
|
*
|
|
* Version 0.0.3, September 14th, 2010.
|
|
*
|
|
* Bugfix: sorting by protocol didn't always fill in the protocol column.
|
|
*/
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
#include "config.h"
|
|
#endif
|
|
|
|
#include <epan/packet.h>
|
|
#include <epan/etypes.h>
|
|
#include <epan/in_cksum.h>
|
|
|
|
#include <epan/prefs.h>
|
|
#include <epan/emem.h>
|
|
#include <epan/strutil.h>
|
|
|
|
#include "packet-rtp.h"
|
|
#include "packet-rtcp.h"
|
|
#include <epan/rtp_pt.h>
|
|
|
|
static int proto_flip = -1;
|
|
|
|
/* BASIC */
|
|
static int hf_flip_basic_e = -1;
|
|
static int hf_flip_basic_reserved = -1;
|
|
static int hf_flip_basic_flowid = -1;
|
|
static int hf_flip_basic_seqnum = -1;
|
|
static int hf_flip_basic_len = -1;
|
|
|
|
/* CHECKSUM */
|
|
static int hf_flip_chksum_etype = -1;
|
|
static int hf_flip_chksum_spare = -1;
|
|
static int hf_flip_chksum_e = -1;
|
|
static int hf_flip_chksum_chksum = -1;
|
|
|
|
#define FLIP_BASIC (0)
|
|
#define FLIP_CHKSUM (1)
|
|
|
|
#define FLIP_BASIC_HDR_LEN (8)
|
|
#define FLIP_CHKSUM_HDR_LEN (4)
|
|
#define FLIP_EXTENSION_HDR_MIN_LEN (4)
|
|
|
|
static const value_string flip_short_header_names[]={
|
|
{ FLIP_BASIC, "BASIC" },
|
|
{ FLIP_CHKSUM, "CHKSUM"},
|
|
{ 0, NULL}
|
|
};
|
|
|
|
static const value_string flip_long_header_names[] = {
|
|
{ FLIP_BASIC, "Basic"},
|
|
{ FLIP_CHKSUM, "Checksum"},
|
|
{ 0, NULL }
|
|
};
|
|
|
|
static const value_string flip_boolean[] = {
|
|
{0, "No"},
|
|
{1, "Yes"},
|
|
{0, NULL}
|
|
};
|
|
|
|
static const value_string flip_etype[] = {
|
|
{ FLIP_CHKSUM, "Checksum" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
#define FLIP_PAYLOAD_DECODING_MODE_NONE (0)
|
|
#define FLIP_PAYLOAD_DECODING_MODE_HEURISTIC (1)
|
|
#define FLIP_PAYLOAD_DECODING_MODE_FORCED (2)
|
|
|
|
static enum_val_t flip_payload_decoding_modes[] = {
|
|
{"none", "no decoding", FLIP_PAYLOAD_DECODING_MODE_NONE},
|
|
{"heuristic", "heuristic", FLIP_PAYLOAD_DECODING_MODE_HEURISTIC},
|
|
{"forced", "forced", FLIP_PAYLOAD_DECODING_MODE_FORCED},
|
|
{NULL, NULL, 0}
|
|
};
|
|
|
|
static gint global_flip_payload_decoding_mode =
|
|
FLIP_PAYLOAD_DECODING_MODE_HEURISTIC;
|
|
|
|
static gboolean is_heur_enabled_rtp = TRUE;
|
|
static gboolean is_heur_enabled_rtcp = TRUE;
|
|
|
|
static const char *global_forced_protocol = "data";
|
|
static gboolean is_forced_handle_ok = FALSE;
|
|
|
|
static gint ett_flip = -1;
|
|
static gint ett_flip_basic = -1;
|
|
static gint ett_flip_chksum = -1;
|
|
static gint ett_flip_payload = -1;
|
|
|
|
static dissector_handle_t rtp_handle;
|
|
static dissector_handle_t rtcp_handle;
|
|
static dissector_handle_t data_handle;
|
|
static dissector_handle_t forced_handle;
|
|
|
|
/* Forward declaration. */
|
|
void
|
|
proto_reg_handoff_flip(void);
|
|
static gboolean
|
|
is_payload_rtp(tvbuff_t *tvb);
|
|
static gboolean
|
|
is_payload_rtcp(tvbuff_t *tvb);
|
|
|
|
/* Dissect the checksum extension header. */
|
|
static int
|
|
dissect_flip_chksum_hdr(tvbuff_t *tvb,
|
|
packet_info *pinfo,
|
|
proto_tree *tree,
|
|
guint16 computed_chksum,
|
|
gboolean *ext_hdr_follows_ptr)
|
|
{
|
|
proto_item *item;
|
|
proto_tree *chksum_hdr_tree;
|
|
guint32 dw;
|
|
guint8 chksum_hdr_etype;
|
|
guint8 chksum_hdr_spare;
|
|
guint8 chksum_hdr_ext;
|
|
guint16 chksum_hdr_chksum;
|
|
|
|
gint bytes_dissected;
|
|
gint offset;
|
|
|
|
item = NULL;
|
|
chksum_hdr_tree = NULL;
|
|
|
|
bytes_dissected = 0;
|
|
offset = 0;
|
|
|
|
dw = tvb_get_ntohl(tvb, offset);
|
|
chksum_hdr_etype = (guint8) ((dw & 0xFF000000) >> 24);
|
|
chksum_hdr_spare = (guint8) ((dw & 0x00FE0000) >> 17);
|
|
chksum_hdr_ext = (guint8) ((dw & 0x00010000) >> 16);
|
|
chksum_hdr_chksum = (guint16) (dw & 0x0000FFFF);
|
|
|
|
/* The actually shouldn't be any headers after checksum. */
|
|
if (chksum_hdr_ext == 1) {
|
|
*ext_hdr_follows_ptr = TRUE;
|
|
}
|
|
else {
|
|
*ext_hdr_follows_ptr = FALSE;
|
|
}
|
|
|
|
if (tree) {
|
|
item = proto_tree_add_text(tree, tvb,
|
|
offset + 0, 4, "Checksum Header");
|
|
chksum_hdr_tree = proto_item_add_subtree(item, ett_flip_chksum);
|
|
|
|
/* ETYPE: 8 bits */
|
|
proto_tree_add_uint_format_value(chksum_hdr_tree, hf_flip_chksum_etype,
|
|
tvb, offset + 0, 1, dw,
|
|
"%s", val_to_str(chksum_hdr_etype,
|
|
flip_etype,
|
|
"Unknown"));
|
|
/* SPARE: 7 bits */
|
|
proto_tree_add_uint_format_value(chksum_hdr_tree, hf_flip_chksum_spare,
|
|
tvb, offset + 1, 1, dw,
|
|
"%d (0x%02x)",
|
|
chksum_hdr_spare, chksum_hdr_spare);
|
|
|
|
/* EXT HDR: 1 bit */
|
|
proto_tree_add_uint_format_value(chksum_hdr_tree, hf_flip_chksum_e,
|
|
tvb, offset + 1, 1, dw,
|
|
"%s", val_to_str(chksum_hdr_ext,
|
|
flip_boolean,
|
|
"Unknown"));
|
|
/* CHKSUM: 16 bits. */
|
|
proto_tree_add_uint_format_value(
|
|
chksum_hdr_tree,
|
|
hf_flip_chksum_chksum,
|
|
tvb, offset + 2, 2,
|
|
chksum_hdr_chksum,
|
|
"0x%04x [%s] (computed 0x%04x)",
|
|
chksum_hdr_chksum,
|
|
((chksum_hdr_chksum == computed_chksum) ? "Correct" : "Incorrect"),
|
|
computed_chksum);
|
|
}
|
|
|
|
/* Show faulty checksums. */
|
|
if (computed_chksum != chksum_hdr_chksum) {
|
|
col_add_fstr(pinfo->cinfo, COL_INFO,
|
|
"Checksum 0x%04x [%s] (computed 0x%04x)",
|
|
chksum_hdr_chksum,
|
|
((chksum_hdr_chksum == computed_chksum) ?
|
|
"Correct" : "Incorrect"),
|
|
computed_chksum);
|
|
}
|
|
|
|
bytes_dissected += FLIP_CHKSUM_HDR_LEN;
|
|
|
|
return bytes_dissected;
|
|
|
|
} /* dissect_flip_chksum_hdr() */
|
|
|
|
|
|
/* Detection logic grabbed from packet-rtp.c and modified. */
|
|
|
|
#define RTP_VERSION(octet) ((octet) >> 6)
|
|
#define RTP_MARKER(octet) ((octet) & 0x80)
|
|
#define RTP_PAYLOAD_TYPE(octet) ((octet) & 0x7F)
|
|
|
|
#define RTP_V2_HEADER_MIN_LEN 12
|
|
|
|
static gboolean
|
|
is_payload_rtp(tvbuff_t *tvb)
|
|
{
|
|
guint8 octet1, octet2;
|
|
unsigned int version;
|
|
unsigned int payload_type;
|
|
unsigned int offset;
|
|
gint len_remaining;
|
|
|
|
offset = 0;
|
|
|
|
len_remaining = tvb_length_remaining(tvb, offset);
|
|
if (len_remaining < RTP_V2_HEADER_MIN_LEN) {
|
|
return FALSE;
|
|
}
|
|
|
|
octet1 = tvb_get_guint8(tvb, offset);
|
|
version = RTP_VERSION(octet1);
|
|
|
|
/* Accept only version 2. */
|
|
if (version != 2) {
|
|
return FALSE;
|
|
}
|
|
|
|
octet2 = tvb_get_guint8(tvb, offset + 1);
|
|
payload_type = RTP_PAYLOAD_TYPE(octet2);
|
|
|
|
if ((payload_type <= PT_H263)
|
|
||
|
|
((payload_type >= PT_UNDF_96) && (payload_type <= PT_UNDF_127))) {
|
|
/* OK */
|
|
;
|
|
}
|
|
else {
|
|
return FALSE;
|
|
}
|
|
|
|
return TRUE;
|
|
|
|
} /* is_payload_rtp() */
|
|
|
|
|
|
/* Detection logic grabbed from packet-rtcp.c and modified. */
|
|
|
|
#define RTCP_SR 200
|
|
#define RTCP_RR 201
|
|
#define RTCP_BYE 203
|
|
#define RTCP_APP 204
|
|
|
|
#define RTCP_V2_HEADER_MIN_LEN 4
|
|
|
|
static gboolean
|
|
is_payload_rtcp(tvbuff_t *tvb)
|
|
{
|
|
unsigned int first_byte;
|
|
unsigned int packet_type;
|
|
unsigned int offset;
|
|
gint len_remaining;
|
|
|
|
offset = 0;
|
|
|
|
len_remaining = tvb_length_remaining(tvb, offset);
|
|
if (len_remaining < RTCP_V2_HEADER_MIN_LEN) {
|
|
return FALSE;
|
|
}
|
|
|
|
/* Look at first byte */
|
|
first_byte = tvb_get_guint8(tvb, offset);
|
|
|
|
/* Are version bits set to 2? */
|
|
if (((first_byte & 0xC0) >> 6) != 2) {
|
|
return FALSE;
|
|
}
|
|
|
|
/* Look at packet type */
|
|
packet_type = tvb_get_guint8(tvb, offset + 1);
|
|
|
|
/* First packet within compound packet is supposed to be a sender
|
|
or receiver report.
|
|
- allow BYE because this happens anyway
|
|
- allow APP because TBCP ("PoC1") packets aren't compound... */
|
|
if (!((packet_type == RTCP_SR) || (packet_type == RTCP_RR) ||
|
|
(packet_type == RTCP_BYE) || (packet_type == RTCP_APP))) {
|
|
return FALSE;
|
|
}
|
|
|
|
/* Overall length must be a multiple of 4 bytes */
|
|
if (tvb_reported_length(tvb) % 4) {
|
|
return FALSE;
|
|
}
|
|
|
|
return TRUE;
|
|
|
|
} /* is_payload_rtcp() */
|
|
|
|
/* Protocol dissection */
|
|
static int
|
|
dissect_flip(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
|
|
{
|
|
proto_item *item;
|
|
proto_item *ti;
|
|
proto_tree *flip_tree;
|
|
proto_tree *basic_hdr_tree;
|
|
proto_tree *payload_hdr_tree;
|
|
tvbuff_t *flip_tvb;
|
|
|
|
guint32 dw1;
|
|
guint32 dw2;
|
|
|
|
/* Basic header fields. */
|
|
guint8 basic_hdr_ext;
|
|
guint8 basic_hdr_reserved;
|
|
guint32 basic_hdr_flow_id;
|
|
guint16 basic_hdr_seqnum;
|
|
guint16 basic_hdr_len;
|
|
|
|
gboolean ext_hdr;
|
|
|
|
gint bytes_dissected;
|
|
gint payload_len;
|
|
gint frame_len;
|
|
gint flip_len;
|
|
gint offset;
|
|
|
|
/* Error handling for basic header. */
|
|
gboolean is_faulty_frame;
|
|
gboolean is_short_flip_len;
|
|
gboolean is_invalid_flip_len;
|
|
|
|
item = NULL;
|
|
ti = NULL;
|
|
flip_tree = NULL;
|
|
basic_hdr_tree = NULL;
|
|
payload_hdr_tree = NULL;
|
|
flip_tvb = NULL;
|
|
|
|
ext_hdr = FALSE;
|
|
|
|
bytes_dissected = 0;
|
|
payload_len = 0;
|
|
frame_len = 0;
|
|
flip_len = 0;
|
|
offset = 0;
|
|
|
|
is_faulty_frame = FALSE;
|
|
is_short_flip_len = FALSE;
|
|
is_invalid_flip_len = FALSE;
|
|
|
|
/* Show this protocol as FLIP. */
|
|
col_set_str(pinfo->cinfo, COL_PROTOCOL, "FLIP");
|
|
|
|
/*
|
|
* The frame can be faulty in several ways:
|
|
* - too short (even for the basic header)
|
|
* - length inconsistent (header and frame info different)
|
|
* - checksum doesn't check out
|
|
* - extension header is indicated, but the frame is too short for it
|
|
* - unknown extension header type
|
|
*/
|
|
|
|
/* Check that there's enough data at least for the basic header. */
|
|
frame_len = tvb_length(tvb);
|
|
if (frame_len < FLIP_BASIC_HDR_LEN) {
|
|
/* Not enough. This must be a malformed packet. */
|
|
goto DISSECT_FLIP_EXIT;
|
|
}
|
|
|
|
bytes_dissected += FLIP_BASIC_HDR_LEN;
|
|
|
|
/* Process the first 32 bits of the basic header. */
|
|
dw1 = tvb_get_ntohl(tvb, offset + 0);
|
|
basic_hdr_ext = ((dw1 & 0x80000000) >> 31);
|
|
basic_hdr_reserved = ((dw1 & 0x70000000) >> 24);
|
|
basic_hdr_flow_id = (dw1 & 0x0FFFFFFF);
|
|
|
|
/* Process the second 32 bits of the basic header. */
|
|
dw2 = tvb_get_ntohl(tvb, offset + 4);
|
|
basic_hdr_seqnum = (guint16) ((dw2 & 0xFFFF0000) >> 16);
|
|
basic_hdr_len = (guint16) (dw2 & 0x0000FFFF);
|
|
|
|
/* Does the basic header indicate that an extension is next? */
|
|
if (basic_hdr_ext == 1) {
|
|
ext_hdr = TRUE;
|
|
}
|
|
|
|
flip_len = basic_hdr_len;
|
|
|
|
/*
|
|
* Check the length value.
|
|
*/
|
|
if ((flip_len < FLIP_BASIC_HDR_LEN) || (flip_len > frame_len)) {
|
|
/* Faulty frame. Show the basic header anyway for debugging. */
|
|
is_faulty_frame = TRUE;
|
|
}
|
|
|
|
/* Fill in the info column. */
|
|
col_add_fstr(pinfo->cinfo, COL_INFO,
|
|
"FlowID %s", val_to_str(basic_hdr_flow_id, NULL, "0x%08x"));
|
|
|
|
flip_tvb = tvb_new_subset(tvb, 0, frame_len, frame_len);
|
|
|
|
/* We are asked for details. */
|
|
if (tree) {
|
|
if (PTREE_DATA(tree)->visible) {
|
|
ti = proto_tree_add_protocol_format(
|
|
tree, proto_flip, flip_tvb, 0, flip_len,
|
|
"NSN FLIP, FlowID %s",
|
|
val_to_str(basic_hdr_flow_id, NULL, "0x%08x"));
|
|
}
|
|
else {
|
|
ti = proto_tree_add_item(tree, proto_flip, flip_tvb, 0,
|
|
flip_len, FALSE);
|
|
}
|
|
flip_tree = proto_item_add_subtree(ti, ett_flip);
|
|
|
|
/* basic header */
|
|
item = proto_tree_add_text(flip_tree, flip_tvb, 0, 8, "Basic Header");
|
|
basic_hdr_tree = proto_item_add_subtree(item, ett_flip_basic);
|
|
|
|
/* Extension header follows? 1 bit. */
|
|
proto_tree_add_uint_format_value(basic_hdr_tree,
|
|
hf_flip_basic_e,
|
|
flip_tvb, offset + 0, 1, dw1,
|
|
"%s", val_to_str(basic_hdr_ext,
|
|
flip_boolean,
|
|
"Unknown"));
|
|
/* Reserved: 3 bits. */
|
|
proto_tree_add_uint_format_value(basic_hdr_tree,
|
|
hf_flip_basic_reserved,
|
|
flip_tvb, offset + 0, 1, dw1,
|
|
"%d", basic_hdr_reserved);
|
|
/* Flow ID: 28 bits. */
|
|
proto_tree_add_item(basic_hdr_tree, hf_flip_basic_flowid,
|
|
flip_tvb, offset + 0, 4, FALSE);
|
|
|
|
/* Sequence number: 16 bits. */
|
|
proto_tree_add_uint_format_value(basic_hdr_tree, hf_flip_basic_seqnum,
|
|
flip_tvb, offset + 4, 2, dw2,
|
|
"%d (0x%04x)",
|
|
basic_hdr_seqnum, basic_hdr_seqnum);
|
|
/* Packet length: 16 bits. */
|
|
proto_tree_add_uint_format_value(basic_hdr_tree, hf_flip_basic_len,
|
|
flip_tvb, offset + 6, 2, dw2,
|
|
"%d (0x%04x)",
|
|
basic_hdr_len, basic_hdr_len);
|
|
}
|
|
|
|
offset += FLIP_BASIC_HDR_LEN;
|
|
|
|
/*
|
|
* Process faults found when parsing the basic header.
|
|
*/
|
|
if (is_faulty_frame == TRUE) {
|
|
if (flip_len > frame_len) {
|
|
col_add_fstr(pinfo->cinfo, COL_INFO,
|
|
"Length mismatch: frame %d bytes, hdr %d bytes",
|
|
frame_len, flip_len);
|
|
}
|
|
else if (flip_len < FLIP_BASIC_HDR_LEN) {
|
|
col_add_fstr(pinfo->cinfo, COL_INFO,
|
|
"Invalid length in basic header: %d bytes", flip_len);
|
|
}
|
|
|
|
goto DISSECT_FLIP_EXIT;
|
|
}
|
|
|
|
/*
|
|
* Now we know that the basic header is sensible.
|
|
*/
|
|
payload_len = basic_hdr_len;
|
|
payload_len -= FLIP_BASIC_HDR_LEN;
|
|
|
|
/*
|
|
* Dissect extension headers (if any).
|
|
*/
|
|
if ((ext_hdr == TRUE) && (payload_len < FLIP_EXTENSION_HDR_MIN_LEN)) {
|
|
col_add_fstr(pinfo->cinfo, COL_INFO,
|
|
"Extension header indicated, but not enough data");
|
|
goto DISSECT_FLIP_EXIT;
|
|
}
|
|
|
|
while ((ext_hdr == TRUE) && (payload_len >= FLIP_EXTENSION_HDR_MIN_LEN)) {
|
|
/* Detect the next header type. */
|
|
guint8 ext_hdr_type;
|
|
gint bytes_handled;
|
|
guint16 computed_chksum;
|
|
|
|
tvbuff_t *chksum_tvb;
|
|
|
|
ext_hdr_type = tvb_get_guint8(flip_tvb, offset);
|
|
|
|
switch (ext_hdr_type) {
|
|
case FLIP_CHKSUM:
|
|
/* Calculate checksum, let the chksum dissector verify it. */
|
|
{
|
|
vec_t vec[2];
|
|
|
|
vec[0].ptr = tvb_get_ptr(flip_tvb, 0, bytes_dissected + 2);
|
|
vec[0].len = bytes_dissected + 2;
|
|
vec[1].ptr = tvb_get_ptr(flip_tvb, bytes_dissected + 4,
|
|
flip_len - (bytes_dissected + 4));
|
|
vec[1].len = flip_len - (bytes_dissected + 4);
|
|
computed_chksum = in_cksum(&vec[0], 2);
|
|
|
|
/* Checksums handled in network order. */
|
|
computed_chksum = g_htons(computed_chksum);
|
|
}
|
|
|
|
chksum_tvb = tvb_new_subset(flip_tvb, offset,
|
|
FLIP_CHKSUM_HDR_LEN,
|
|
FLIP_CHKSUM_HDR_LEN);
|
|
|
|
/* Note that flip_tree is NULL if no details are requested. */
|
|
bytes_handled = dissect_flip_chksum_hdr(chksum_tvb,
|
|
pinfo,
|
|
flip_tree,
|
|
computed_chksum,
|
|
&ext_hdr);
|
|
bytes_dissected += bytes_handled;
|
|
payload_len -= bytes_handled;
|
|
offset += bytes_handled;
|
|
break;
|
|
|
|
default:
|
|
/* Unknown header type. */
|
|
col_add_fstr(pinfo->cinfo, COL_INFO,
|
|
"Invalid extension header type 0x%02x", ext_hdr_type);
|
|
goto DISSECT_FLIP_EXIT;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Show payload (if any) as bytes.
|
|
*/
|
|
if (payload_len > 0) {
|
|
|
|
dissector_handle_t handle;
|
|
tvbuff_t *payload_tvb;
|
|
gint data_len;
|
|
gboolean has_user_messed_up;
|
|
|
|
data_len = 0;
|
|
has_user_messed_up = FALSE;
|
|
|
|
payload_tvb = tvb_new_subset(flip_tvb, offset,
|
|
payload_len, payload_len);
|
|
|
|
/*
|
|
* 1) no decoding -> data
|
|
* 2) heuristic decoding
|
|
* 3) forced decoding
|
|
*/
|
|
switch (global_flip_payload_decoding_mode) {
|
|
case FLIP_PAYLOAD_DECODING_MODE_NONE:
|
|
/* Dissect as data. */
|
|
handle = data_handle;
|
|
break;
|
|
|
|
case FLIP_PAYLOAD_DECODING_MODE_HEURISTIC:
|
|
if ((is_heur_enabled_rtp == TRUE)
|
|
&&
|
|
(is_payload_rtp(payload_tvb) == TRUE)) {
|
|
/* Dissect as RTP. */
|
|
handle = rtp_handle;
|
|
}
|
|
else if ((is_heur_enabled_rtcp == TRUE)
|
|
&&
|
|
(is_payload_rtcp(payload_tvb))) {
|
|
/* Dissect as RTCP. */
|
|
handle = rtcp_handle;
|
|
}
|
|
else {
|
|
/* Dissect as data. */
|
|
handle = data_handle;
|
|
}
|
|
break;
|
|
|
|
case FLIP_PAYLOAD_DECODING_MODE_FORCED:
|
|
if (is_forced_handle_ok == TRUE) {
|
|
handle = forced_handle;
|
|
}
|
|
else {
|
|
/* Use data as backup. */
|
|
handle = data_handle;
|
|
|
|
/* Tell the user he messed up. */
|
|
has_user_messed_up = TRUE;
|
|
}
|
|
break;
|
|
|
|
default:
|
|
/* Fault in dissector's internal logic. */
|
|
DISSECTOR_ASSERT(0);
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* If tree is NULL, we still cannot quit, we must give
|
|
* the RTP/RTCP/data dissectors a chance to fill in
|
|
* the protocol column.
|
|
*/
|
|
data_len = call_dissector(handle, payload_tvb, pinfo, tree);
|
|
|
|
if (has_user_messed_up == TRUE) {
|
|
col_add_fstr(pinfo->cinfo, COL_INFO,
|
|
"Invalid user dissector \"%s\"",
|
|
global_forced_protocol);
|
|
}
|
|
|
|
bytes_dissected += data_len;
|
|
|
|
} /* if (payload_len > 0) */
|
|
|
|
DISSECT_FLIP_EXIT:
|
|
return bytes_dissected;
|
|
|
|
} /* dissect_flip() */
|
|
|
|
|
|
/* Protocol initialization */
|
|
void
|
|
proto_register_flip(void)
|
|
{
|
|
static hf_register_info hf[] = {
|
|
/*
|
|
* Basic header.
|
|
*/
|
|
{&hf_flip_basic_e,
|
|
{"Extension Header Follows", "flip.basic.e", FT_UINT32, BASE_DEC,
|
|
VALS(flip_boolean), 0x80000000, NULL, HFILL}
|
|
},
|
|
{&hf_flip_basic_reserved,
|
|
{"Reserved", "flip.basic.reserved", FT_UINT32, BASE_DEC,
|
|
NULL, 0x70000000, "Basic Header Reserved", HFILL}
|
|
},
|
|
{&hf_flip_basic_flowid,
|
|
{"FlowID", "flip.basic.flowid", FT_UINT32, BASE_HEX,
|
|
NULL, 0x0FFFFFFF, "Basic Header Flow ID", HFILL}
|
|
},
|
|
{&hf_flip_basic_seqnum,
|
|
{"Seqnum", "flip.basic.seqnum", FT_UINT32, BASE_DEC,
|
|
NULL, 0xFFFF0000, "Basic Header Sequence Number", HFILL}
|
|
},
|
|
{&hf_flip_basic_len,
|
|
{"Len", "flip.basic.len", FT_UINT32, BASE_DEC,
|
|
NULL, 0x0000FFFF, "Basic Header Packet Length", HFILL}
|
|
},
|
|
/*
|
|
* Checksum header.
|
|
*/
|
|
{&hf_flip_chksum_etype,
|
|
{"Extension Type", "flip.chksum.etype", FT_UINT32, BASE_DEC,
|
|
VALS(flip_etype), 0xFF000000, "Checksum Header Extension Type", HFILL}
|
|
},
|
|
{&hf_flip_chksum_spare,
|
|
{"Spare", "flip.chksum.spare", FT_UINT32, BASE_DEC,
|
|
NULL, 0x00FE0000, "Checksum Header Spare", HFILL}
|
|
},
|
|
{&hf_flip_chksum_e,
|
|
{"Extension Header Follows", "flip.chksum.e", FT_UINT32, BASE_DEC,
|
|
VALS(flip_boolean), 0x00010000, NULL, HFILL}
|
|
},
|
|
{&hf_flip_chksum_chksum,
|
|
{"Checksum", "flip.chksum.chksum", FT_UINT32, BASE_HEX,
|
|
NULL, 0x0000FFFF, NULL, HFILL}
|
|
}
|
|
};
|
|
|
|
static gint *ett[] = {
|
|
&ett_flip,
|
|
&ett_flip_basic,
|
|
&ett_flip_chksum,
|
|
&ett_flip_payload
|
|
};
|
|
|
|
module_t *flip_module;
|
|
|
|
proto_flip = proto_register_protocol(
|
|
"NSN FLIP", /* name */
|
|
"FLIP", /* short name */
|
|
"flip" /* abbrev */
|
|
);
|
|
|
|
proto_register_field_array(proto_flip, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
|
|
|
|
flip_module = prefs_register_protocol(proto_flip,
|
|
proto_reg_handoff_flip);
|
|
|
|
/* Register preferences */
|
|
prefs_register_enum_preference(
|
|
flip_module,
|
|
"decoding_mode",
|
|
"FLIP payload decoding mode",
|
|
"Decode FLIP payload according to mode",
|
|
&global_flip_payload_decoding_mode,
|
|
flip_payload_decoding_modes,
|
|
TRUE);
|
|
|
|
prefs_register_static_text_preference(
|
|
flip_module,
|
|
"heur_enabled_protocols",
|
|
"Heuristic mode: enabled protocols",
|
|
"Enabled protocols for heuristic mode");
|
|
|
|
prefs_register_bool_preference(
|
|
flip_module,
|
|
"heur_decode_rtp",
|
|
"RTP",
|
|
"Decode payload as RTP if detected",
|
|
&is_heur_enabled_rtp);
|
|
|
|
prefs_register_bool_preference(
|
|
flip_module,
|
|
"heur_decode_rtcp",
|
|
"RTCP",
|
|
"Decode payload as RTCP if detected",
|
|
&is_heur_enabled_rtcp);
|
|
|
|
prefs_register_static_text_preference(
|
|
flip_module,
|
|
"forced_protocol",
|
|
"Forced mode: decode to user-specified protocol",
|
|
"Mapping of flow IDs to their decodings");
|
|
|
|
prefs_register_string_preference(
|
|
flip_module,
|
|
"forced_decode",
|
|
"Protocol name",
|
|
"Decoding to user-defined protocol",
|
|
&global_forced_protocol);
|
|
|
|
} /* proto_register_flip() */
|
|
|
|
/* Protocol handoff */
|
|
void
|
|
proto_reg_handoff_flip(void)
|
|
{
|
|
dissector_handle_t flip_handle;
|
|
|
|
static gboolean flip_prefs_initialized = FALSE;
|
|
|
|
if (flip_prefs_initialized == FALSE) {
|
|
flip_handle = new_create_dissector_handle(dissect_flip, proto_flip);
|
|
dissector_add_uint("ethertype", ETHERTYPE_FLIP, flip_handle);
|
|
|
|
rtp_handle = find_dissector("rtp");
|
|
rtcp_handle = find_dissector("rtcp");
|
|
data_handle = find_dissector("data");
|
|
|
|
flip_prefs_initialized = TRUE;
|
|
}
|
|
|
|
/* Preferences update: check user-specified dissector. */
|
|
is_forced_handle_ok = FALSE;
|
|
forced_handle = find_dissector(global_forced_protocol);
|
|
if (forced_handle != NULL) {
|
|
is_forced_handle_ok = TRUE;
|
|
}
|
|
|
|
} /* proto_reg_handoff_flip() */
|
|
|
|
/* end of file packet-flip.c */
|