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wireshark/epan/dissectors/packet-fr.c

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/* packet-fr.c
* Routines for Frame Relay dissection
*
* Copyright 2001, Paul Ionescu <paul@acorp.ro>
*
* $Id$
*
* 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.
*
* References:
*
* http://www.protocols.com/pbook/frame.htm
* http://www.mplsforum.org/frame/Approved/FRF.3/FRF.3.2.pdf
* ITU Recommendations Q.922 and Q.933
* RFC-1490
* RFC-2427
* Cisco encapsulation
* http://www.trillium.com/assets/legacyframe/white_paper/8771019.pdf
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <string.h>
#include <glib.h>
#include <epan/packet.h>
#include <epan/prefs.h>
#include "packet-llc.h"
#include "packet-chdlc.h"
#include "xdlc.h"
#include "etypes.h"
#include "oui.h"
#include "nlpid.h"
#include "greproto.h"
/*
* Bits in the address field.
*/
#define FRELAY_EA 0x01 /* Address field extension bit */
#define FRELAY_UPPER_DLCI 0xFC /* Upper DLCI */
#define FRELAY_CR 0x02 /* Command/response bit in first octet */
#define FRELAY_SECOND_DLCI 0xF0 /* DLCI bits in FECN/BECN/DE octet */
#define FRELAY_FECN 0x08 /* Forward Explicit Congestion Notification */
#define FRELAY_BECN 0x04 /* Backward Explicit Congestion Notification */
#define FRELAY_DE 0x02 /* Discard Eligibility */
#define FRELAY_THIRD_DLCI 0xFE /* DLCI bits in third octet, if any */
#define FRELAY_LOWER_DLCI 0xFC /* Lower DLCI */
#define FRELAY_DC 0x02 /* DLCI or DL-CORE control indicator in last octet */
#define FROM_DCE 0x80 /* for direction setting */
static gint proto_fr = -1;
static gint ett_fr = -1;
static gint ett_fr_address = -1;
static gint ett_fr_control = -1;
static gint hf_fr_ea = -1;
static gint hf_fr_upper_dlci = -1;
static gint hf_fr_cr = -1;
static gint hf_fr_second_dlci = -1;
static gint hf_fr_fecn = -1;
static gint hf_fr_becn = -1;
static gint hf_fr_de = -1;
static gint hf_fr_third_dlci = -1;
static gint hf_fr_dlcore_control = -1;
static gint hf_fr_lower_dlci = -1;
static gint hf_fr_dc = -1;
static gint hf_fr_dlci = -1;
static gint hf_fr_control = -1;
static gint hf_fr_n_r = -1;
static gint hf_fr_n_s = -1;
static gint hf_fr_p = -1;
static gint hf_fr_p_ext = -1;
static gint hf_fr_f = -1;
static gint hf_fr_f_ext = -1;
static gint hf_fr_s_ftype = -1;
static gint hf_fr_u_modifier_cmd = -1;
static gint hf_fr_u_modifier_resp = -1;
static gint hf_fr_ftype_i = -1;
static gint hf_fr_ftype_s_u = -1;
static gint hf_fr_ftype_s_u_ext = -1;
static gint hf_fr_nlpid = -1;
static gint hf_fr_oui = -1;
static gint hf_fr_pid = -1;
static gint hf_fr_snaptype = -1;
static gint hf_fr_chdlctype = -1;
static dissector_handle_t eth_handle;
static dissector_handle_t gprs_ns_handle;
static dissector_handle_t data_handle;
static dissector_table_t osinl_subdissector_table;
/*
* Encapsulation type.
* XXX - this should be per-DLCI as well.
*/
#define FRF_3_2 0 /* FRF 3.2 or Cisco HDLC */
#define GPRS_NS 1 /* GPRS Network Services (3GPP TS 08.16) */
#define RAW_ETHER 2 /* Raw Ethernet */
static gint fr_encap = FRF_3_2;
static const true_false_string cmd_string = {
"Command",
"Response"
};
static const true_false_string ctrl_string = {
"DLCI Address",
"Control"
};
static const true_false_string ea_string = {
"Last Octet",
"More Follows"
};
/*
* This isn't the same as "nlpid_vals[]"; 0x08 is Q.933, not Q.931,
* and 0x09 is LMI, not Q.2931, and we assume that it's an initial
* protocol identifier, so 0x01 is T.70, not X.29.
*/
static const value_string fr_nlpid_vals[] = {
{ NLPID_NULL, "NULL" },
{ NLPID_IPI_T_70, "T.70" }, /* XXX - IPI, or SPI? */
{ NLPID_X_633, "X.633" },
{ NLPID_Q_931, "Q.933" },
{ NLPID_LMI, "LMI" },
{ NLPID_Q_2119, "Q.2119" },
{ NLPID_SNAP, "SNAP" },
{ NLPID_ISO8473_CLNP, "CLNP" },
{ NLPID_ISO9542_ESIS, "ESIS" },
{ NLPID_ISO10589_ISIS, "ISIS" },
{ NLPID_ISO10747_IDRP, "IDRP" },
{ NLPID_ISO9542X25_ESIS, "ESIS (X.25)" },
{ NLPID_ISO10030, "ISO 10030" },
{ NLPID_ISO11577, "ISO 11577" },
{ NLPID_COMPRESSED, "Data compression protocol" },
{ NLPID_IP, "IP" },
{ NLPID_IP6, "IPv6" },
{ NLPID_PPP, "PPP" },
{ 0, NULL },
};
static dissector_table_t fr_subdissector_table;
static dissector_table_t fr_osinl_subdissector_table;
static void dissect_fr_nlpid(tvbuff_t *tvb, int offset, packet_info *pinfo,
proto_tree *tree, proto_item *ti,
proto_tree *fr_tree, guint8 fr_ctrl);
static void dissect_lapf(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);
static void dissect_fr_xid(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);
/* Used only for U frames */
static const xdlc_cf_items fr_cf_items = {
NULL,
NULL,
&hf_fr_p,
&hf_fr_f,
NULL,
&hf_fr_u_modifier_cmd,
&hf_fr_u_modifier_resp,
NULL,
&hf_fr_ftype_s_u
};
/* Used only for I and S frames */
static const xdlc_cf_items fr_cf_items_ext = {
&hf_fr_n_r,
&hf_fr_n_s,
&hf_fr_p_ext,
&hf_fr_f_ext,
&hf_fr_s_ftype,
NULL,
NULL,
&hf_fr_ftype_i,
&hf_fr_ftype_s_u_ext
};
static void
dissect_fr_common(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
gboolean has_direction)
{
int offset = 0;
proto_item *ti = NULL;
proto_tree *fr_tree = NULL;
proto_item *octet_item = NULL;
proto_tree *octet_tree = NULL;
guint8 fr_octet;
int is_response = FALSE;
guint32 address;
guint8 fr_ctrl;
guint16 fr_type;
tvbuff_t *next_tvb;
if (check_col(pinfo->cinfo, COL_PROTOCOL))
col_set_str(pinfo->cinfo, COL_PROTOCOL, "FR");
if (check_col(pinfo->cinfo, COL_INFO))
col_clear(pinfo->cinfo, COL_INFO);
if (has_direction) {
if (pinfo->pseudo_header->x25.flags & FROM_DCE) {
if (check_col(pinfo->cinfo, COL_RES_DL_DST))
col_set_str(pinfo->cinfo, COL_RES_DL_DST, "DTE");
if (check_col(pinfo->cinfo, COL_RES_DL_SRC))
col_set_str(pinfo->cinfo, COL_RES_DL_SRC, "DCE");
} else {
if (check_col(pinfo->cinfo, COL_RES_DL_DST))
col_set_str(pinfo->cinfo, COL_RES_DL_DST, "DCE");
if (check_col(pinfo->cinfo, COL_RES_DL_SRC))
col_set_str(pinfo->cinfo, COL_RES_DL_SRC, "DTE");
}
}
/*
* OK, fetch the address field - keep going until we get an EA bit.
*/
fr_octet = tvb_get_guint8(tvb, offset);
if (tree) {
ti = proto_tree_add_protocol_format(tree, proto_fr, tvb, 0, -1, "Frame Relay");
fr_tree = proto_item_add_subtree(ti, ett_fr);
}
if (fr_octet & FRELAY_EA) {
/*
* Bogus! There should be at least 2 octets.
* XXX - is this FRF.12 frame relay fragmentation? If so, we
* should dissect it as such, if possible.
*/
address = 0;
if (tree) {
proto_tree_add_text(fr_tree, tvb, offset, 1,
"Bogus 1-octet address field");
offset++;
}
} else {
/*
* The first octet contains the upper 6 bits of the DLCI, as well
* as the C/R bit.
*/
address = (fr_octet & FRELAY_UPPER_DLCI) >> 2;
is_response = (fr_octet & FRELAY_CR);
if (tree) {
octet_item = proto_tree_add_text(fr_tree, tvb, offset, 1,
"First address octet: 0x%02x", fr_octet);
octet_tree = proto_item_add_subtree(octet_item, ett_fr_address);
proto_tree_add_uint(octet_tree, hf_fr_upper_dlci, tvb, offset, 1, fr_octet);
proto_tree_add_boolean(octet_tree, hf_fr_cr, tvb, offset, 1, fr_octet);
proto_tree_add_boolean(octet_tree, hf_fr_ea, tvb, offset, 1, fr_octet);
}
offset++;
/*
* The second octet contains 4 more bits of DLCI, as well as FECN,
* BECN, and DE.
*/
fr_octet = tvb_get_guint8(tvb, offset);
address = (address << 4) | ((fr_octet & FRELAY_SECOND_DLCI) >> 4);
if (tree) {
octet_item = proto_tree_add_text(fr_tree, tvb, offset, 1,
"Second address octet: 0x%02x",
fr_octet);
octet_tree = proto_item_add_subtree(octet_item, ett_fr_address);
proto_tree_add_uint(octet_tree, hf_fr_second_dlci, tvb, offset, 1, fr_octet);
proto_tree_add_boolean(octet_tree, hf_fr_fecn, tvb, 0, offset, fr_octet);
proto_tree_add_boolean(octet_tree, hf_fr_becn, tvb, 0, offset, fr_octet);
proto_tree_add_boolean(octet_tree, hf_fr_de, tvb, 0, offset, fr_octet);
proto_tree_add_boolean(octet_tree, hf_fr_ea, tvb, offset, 1, fr_octet);
}
offset++;
if (!(fr_octet & FRELAY_EA)) {
/*
* We have 3 or more address octets.
*
* The third octet contains 7 more bits of DLCI if EA isn't set,
* and lower DLCI or DL-CORE control plus the DLCI or DL-CORE
* control indicator flag if EA is set.
*/
fr_octet = tvb_get_guint8(tvb, offset);
if (!(fr_octet & FRELAY_EA)) {
/*
* 7 more bits of DLCI.
*/
address = (address << 7) | ((fr_octet & FRELAY_THIRD_DLCI) >> 1);
if (tree) {
octet_item = proto_tree_add_text(fr_tree, tvb, offset, 1,
"Third address octet: 0x%02x",
fr_octet);
octet_tree = proto_item_add_subtree(octet_item, ett_fr_address);
proto_tree_add_uint(octet_tree, hf_fr_third_dlci, tvb, offset, 1, fr_octet);
proto_tree_add_boolean(octet_tree, hf_fr_ea, tvb, offset, 1, fr_octet);
}
offset++;
fr_octet = tvb_get_guint8(tvb, offset);
while (!(fr_octet & FRELAY_EA)) {
/*
* Bogus! More than 4 octets of address.
*/
if (tree) {
proto_tree_add_text(fr_tree, tvb, offset, 1,
"Bogus extra address octet");
}
offset++;
fr_octet = tvb_get_guint8(tvb, offset);
}
}
if (tree) {
octet_item = proto_tree_add_text(fr_tree, tvb, offset, 1,
"Final address octet: 0x%02x",
fr_octet);
octet_tree = proto_item_add_subtree(octet_item, ett_fr_address);
}
/*
* Last octet - contains lower DLCI or DL-CORE control, DLCI or
* DL-CORE control indicator flag.
*/
if (fr_octet & FRELAY_DC) {
/*
* DL-CORE.
*/
proto_tree_add_uint(octet_tree, hf_fr_dlcore_control, tvb, offset, 1, fr_octet);
} else {
/*
* Last 6 bits of DLCI.
*/
address = (address << 6) | ((fr_octet & FRELAY_LOWER_DLCI) >> 2);
proto_tree_add_uint(octet_tree, hf_fr_lower_dlci, tvb, offset, 1, fr_octet);
}
proto_tree_add_boolean(octet_tree, hf_fr_dc, tvb, offset, 1, fr_octet);
proto_tree_add_boolean(octet_tree, hf_fr_ea, tvb, offset, 1, fr_octet);
}
}
if (tree) {
/* Put the full DLCI into the protocol tree. */
proto_tree_add_uint(fr_tree, hf_fr_dlci, tvb, 0, offset, address);
}
pinfo->ctype = CT_DLCI;
pinfo->circuit_id = address;
if (check_col(pinfo->cinfo, COL_INFO))
col_add_fstr(pinfo->cinfo, COL_INFO, "DLCI %u", address);
switch (fr_encap) {
case FRF_3_2:
fr_ctrl = tvb_get_guint8(tvb, offset);
if (fr_ctrl == XDLC_U) {
dissect_xdlc_control(tvb, offset, pinfo, fr_tree, hf_fr_control,
ett_fr_control, &fr_cf_items, &fr_cf_items_ext,
NULL, NULL, is_response, TRUE, TRUE);
offset++;
/*
* XXX - treat DLCI 0 specially? On DLCI 0, an NLPID of 0x08
* means Q.933, but on other circuits it could be the "for
* protocols which do not have an NLPID assigned or do not
* have a SNAP encapsulation" stuff from RFC 2427.
*/
dissect_fr_nlpid(tvb, offset, pinfo, tree, ti, fr_tree, fr_ctrl);
} else {
if (address == 0) {
/*
* This must be some sort of LAPF on DLCI 0 for SVC
* because DLCI 0 is reserved for LMI and SVC signaling
* encapsulated in LAPF, and LMI is transmitted in
* unnumbered information (03), so this must be LAPF
* (guessing).
*
* XXX - but what is it? Is Q.933 carried inside UI
* frames or other types of frames or both?
*/
dissect_xdlc_control(tvb, offset, pinfo, fr_tree,
hf_fr_control, ett_fr_control,
&fr_cf_items, &fr_cf_items_ext,
NULL, NULL, is_response, TRUE, TRUE);
dissect_lapf(tvb_new_subset(tvb,offset,-1,-1),pinfo,tree);
return;
}
if (fr_ctrl == (XDLC_U|XDLC_XID)) {
dissect_xdlc_control(tvb, offset, pinfo, fr_tree,
hf_fr_control, ett_fr_control,
&fr_cf_items, &fr_cf_items_ext,
NULL, NULL, is_response, TRUE, TRUE);
dissect_fr_xid(tvb_new_subset(tvb,offset,-1,-1),pinfo,tree);
return;
}
/*
* If the data does not start with unnumbered information (03) and
* the DLCI# is not 0, then there may be Cisco Frame Relay encapsulation.
*/
fr_type = tvb_get_ntohs(tvb, offset);
if (ti != NULL) {
/* Include the Cisco HDLC type in the top-level protocol
tree item. */
proto_item_set_end(ti, tvb, offset+2);
}
chdlctype(fr_type, tvb, offset+2, pinfo, tree, fr_tree, hf_fr_chdlctype);
}
break;
case GPRS_NS:
next_tvb = tvb_new_subset(tvb, offset, -1, -1);
if (address != 0)
call_dissector(gprs_ns_handle, next_tvb, pinfo, tree);
else
dissect_lapf(next_tvb, pinfo, tree);
break;
case RAW_ETHER:
next_tvb = tvb_new_subset(tvb, offset, -1, -1);
if (address != 0)
call_dissector(eth_handle, next_tvb, pinfo, tree);
else
dissect_lapf(next_tvb, pinfo, tree);
break;
}
}
static void
dissect_fr(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
dissect_fr_common(tvb, pinfo, tree, FALSE);
}
static void
dissect_fr_phdr(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
dissect_fr_common(tvb, pinfo, tree, TRUE);
}
static void dissect_fr_uncompressed(tvbuff_t *tvb, packet_info *pinfo,
proto_tree *tree)
{
proto_item *ti = NULL;
proto_tree *fr_tree = NULL;
if (check_col(pinfo->cinfo, COL_PROTOCOL))
col_set_str(pinfo->cinfo, COL_PROTOCOL, "FR");
if (check_col(pinfo->cinfo, COL_INFO))
col_clear(pinfo->cinfo, COL_INFO);
if (tree) {
ti = proto_tree_add_protocol_format(tree, proto_fr, tvb, 0, -1, "Frame Relay");
fr_tree = proto_item_add_subtree(ti, ett_fr);
}
dissect_fr_nlpid(tvb, 0, pinfo, tree, ti, fr_tree, XDLC_U);
}
static void dissect_fr_nlpid(tvbuff_t *tvb, int offset, packet_info *pinfo,
proto_tree *tree, proto_item *ti,
proto_tree *fr_tree, guint8 fr_ctrl)
{
guint8 fr_nlpid;
tvbuff_t *next_tvb;
/*
* Tentatively set the Frame Relay item not to include the NLPID,
* as OSI network layer protocols consider it to be part of
* the OSI PDU.
*/
proto_item_set_end(ti, tvb, offset);
fr_nlpid = tvb_get_guint8 (tvb,offset);
if (fr_nlpid == 0) {
if (tree)
proto_tree_add_text(fr_tree, tvb, offset, 1, "Padding");
offset++;
if (ti != NULL) {
/* Include the padding in the top-level protocol tree item. */
proto_item_set_end(ti, tvb, offset);
}
fr_nlpid=tvb_get_guint8( tvb,offset);
}
/*
* OSI network layer protocols consider the NLPID to be part
* of the frame, so we'll pass it as part of the payload and,
* if the protocol is one of those, add it as a hidden item here.
* We check both the generic OSI NLPID dissector table and
* the Frame Relay OSI NLPID dissector table - the latter is for
* NLPID's such as 0x08, which is Q.933 in Frame Relay but
* other protocols (e.g., Q.931) on other network layers.
*
* "OSI network layer protocols" includes Q.933.
*
* XXX - note that an NLPID of 0x08 for Q.933 could either be a
* Q.933 signaling message or a message for a protocol
* identified by a 2-octet layer 2 protocol type and a
* 2-octet layer 3 protocol type, those protocol type
* octets having the values from octets 6, 6a, 7, and 7a
* of a Q.931 low layer compatibility information element
* (section 4.5.19 of Q.931; Q.933 says they have the values
* from a Q.933 low layer compatibility information element,
* but Q.933 low layer compatibility information elements
* don't have protocol values in them).
*
* Assuming that, as Q.933 seems to imply, that Q.933 messages
* look just like Q.931 messages except where it explicitly
* says they differ, then the octet after the NLPID would,
* in a Q.933 message, have its upper 4 bits zero (that's
* the length of the call reference value, in Q.931, and
* is limited to 15 or fewer octets). As appears to be the case,
* octet 6 of a Q.931 low layer compatibility element has the
* 0x40 bit set, so you can distinguish between a Q.933
* message and an encapsulated packet by checking whether
* the upper 4 bits of the octet after the NLPID are zero.
*
* Either that, or it's Q.933 iff the DLCI is 0.
*/
next_tvb = tvb_new_subset(tvb,offset,-1,-1);
if (dissector_try_port(osinl_subdissector_table, fr_nlpid, next_tvb,
pinfo, tree) ||
dissector_try_port(fr_osinl_subdissector_table, fr_nlpid, next_tvb,
pinfo, tree)) {
/*
* Yes, we got a match. Add the NLPID as a hidden item,
* so you can, at least, filter on it.
*/
if (tree)
proto_tree_add_uint_hidden(fr_tree, hf_fr_nlpid,
tvb, offset, 1, fr_nlpid );
return;
}
/*
* All other protocols don't.
*
* XXX - what about Cisco/Gang-of-Four LMI? Is the 0x09 considered
* to be part of the LMI PDU?
*/
if (tree)
proto_tree_add_uint(fr_tree, hf_fr_nlpid, tvb, offset, 1, fr_nlpid );
offset++;
switch (fr_nlpid) {
case NLPID_SNAP:
if (ti != NULL) {
/* Include the NLPID and SNAP header in the top-level
protocol tree item. */
proto_item_set_end(ti, tvb, offset+5);
}
dissect_snap(tvb, offset, pinfo, tree, fr_tree, fr_ctrl,
hf_fr_oui, hf_fr_snaptype, hf_fr_pid, 0);
return;
default:
if (ti != NULL) {
/* Include the NLPID in the top-level protocol tree item. */
proto_item_set_end(ti, tvb, offset);
}
next_tvb = tvb_new_subset(tvb,offset,-1,-1);
if (!dissector_try_port(fr_subdissector_table,fr_nlpid,
next_tvb, pinfo, tree))
call_dissector(data_handle,next_tvb, pinfo, tree);
break;
}
}
static void dissect_lapf(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
proto_tree_add_text(tree, tvb, 0, 0, "Frame relay lapf not yet implemented");
call_dissector(data_handle,tvb_new_subset(tvb,0,-1,-1),pinfo,tree);
}
static void dissect_fr_xid(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
proto_tree_add_text(tree, tvb, 0, 0, "Frame relay xid not yet implemented");
call_dissector(data_handle,tvb_new_subset(tvb,0,-1,-1),pinfo,tree);
}
/* Register the protocol with Ethereal */
void proto_register_fr(void)
{
static hf_register_info hf[] = {
{ &hf_fr_ea, {
"EA", "fr.ea", FT_BOOLEAN, 8, TFS(&ea_string),
FRELAY_EA, "Extended Address", HFILL }},
{ &hf_fr_upper_dlci, {
"Upper DLCI", "fr.upper_dlci", FT_UINT8, BASE_HEX,
NULL, FRELAY_UPPER_DLCI, "Upper bits of DLCI", HFILL }},
{ &hf_fr_cr, {
"CR", "fr.cr", FT_BOOLEAN, 8, TFS(&cmd_string),
FRELAY_CR, "Command/Response", HFILL }},
{ &hf_fr_second_dlci, {
"Second DLCI", "fr.second_dlci", FT_UINT8, BASE_HEX,
NULL, FRELAY_SECOND_DLCI, "Bits below upper bits of DLCI", HFILL }},
{ &hf_fr_fecn, {
"FECN", "fr.fecn", FT_BOOLEAN, 8,
NULL, FRELAY_FECN, "Forward Explicit Congestion Notification", HFILL }},
{ &hf_fr_becn, {
"BECN", "fr.becn", FT_BOOLEAN, 8,
NULL, FRELAY_BECN, "Backward Explicit Congestion Notification", HFILL }},
{ &hf_fr_de, {
"DE", "fr.de", FT_BOOLEAN, 8,
NULL, FRELAY_DE, "Discard Eligibility", HFILL }},
{ &hf_fr_third_dlci, {
"Third DLCI", "fr.third_dlci", FT_UINT8, BASE_HEX,
NULL, FRELAY_THIRD_DLCI, "Additional bits of DLCI", HFILL }},
{ &hf_fr_dlcore_control, {
"DL-CORE Control", "fr.dlcore_control", FT_UINT8, BASE_HEX,
NULL, FRELAY_LOWER_DLCI, "DL-Core control bits", HFILL }},
{ &hf_fr_lower_dlci, {
"Lower DLCI", "fr.lower_dlci", FT_UINT8, BASE_HEX,
NULL, FRELAY_LOWER_DLCI, "Lower bits of DLCI", HFILL }},
{ &hf_fr_dc, {
"DC", "fr.dc", FT_BOOLEAN, 16, TFS(&ctrl_string),
FRELAY_CR, "Address/Control", HFILL }},
{ &hf_fr_dlci, {
"DLCI", "fr.dlci", FT_UINT32, BASE_DEC,
NULL, 0x0, "Data-Link Connection Identifier", HFILL }},
{ &hf_fr_control, {
"Control Field", "fr.control", FT_UINT8, BASE_HEX,
NULL, 0x0, "Control field", HFILL }},
{ &hf_fr_n_r, {
"N(R)", "fr.control.n_r", FT_UINT16, BASE_DEC,
NULL, XDLC_N_R_EXT_MASK, "", HFILL }},
{ &hf_fr_n_s, {
"N(S)", "fr.control.n_s", FT_UINT16, BASE_DEC,
NULL, XDLC_N_S_EXT_MASK, "", HFILL }},
{ &hf_fr_p, {
"Poll", "fr.control.p", FT_BOOLEAN, 8,
TFS(&flags_set_truth), XDLC_P_F, "", HFILL }},
{ &hf_fr_p_ext, {
"Poll", "fr.control.p", FT_BOOLEAN, 16,
TFS(&flags_set_truth), XDLC_P_F_EXT, "", HFILL }},
{ &hf_fr_f, {
"Final", "fr.control.f", FT_BOOLEAN, 8,
TFS(&flags_set_truth), XDLC_P_F, "", HFILL }},
{ &hf_fr_f_ext, {
"Final", "fr.control.f", FT_BOOLEAN, 16,
TFS(&flags_set_truth), XDLC_P_F_EXT, "", HFILL }},
{ &hf_fr_s_ftype, {
"Supervisory frame type", "fr.control.s_ftype", FT_UINT16, BASE_HEX,
VALS(stype_vals), XDLC_S_FTYPE_MASK, "", HFILL }},
{ &hf_fr_u_modifier_cmd, {
"Command", "lapd.control.u_modifier_cmd", FT_UINT8, BASE_HEX,
VALS(modifier_vals_cmd), XDLC_U_MODIFIER_MASK, "", HFILL }},
{ &hf_fr_u_modifier_resp, {
"Response", "lapd.control.u_modifier_resp", FT_UINT8, BASE_HEX,
VALS(modifier_vals_resp), XDLC_U_MODIFIER_MASK, "", HFILL }},
{ &hf_fr_ftype_i, {
"Frame type", "fr.control.ftype", FT_UINT16, BASE_HEX,
VALS(ftype_vals), XDLC_I_MASK, "", HFILL }},
{ &hf_fr_ftype_s_u, {
"Frame type", "fr.control.ftype", FT_UINT8, BASE_HEX,
VALS(ftype_vals), XDLC_S_U_MASK, "", HFILL }},
{ &hf_fr_ftype_s_u_ext, {
"Frame type", "fr.control.ftype", FT_UINT16, BASE_HEX,
VALS(ftype_vals), XDLC_S_U_MASK, "", HFILL }},
{ &hf_fr_nlpid, {
"NLPID", "fr.nlpid", FT_UINT8, BASE_HEX,
VALS(fr_nlpid_vals), 0x0, "Frame Relay Encapsulated Protocol NLPID", HFILL }},
{ &hf_fr_oui, {
"Organization Code", "fr.snap.oui", FT_UINT24, BASE_HEX,
VALS(oui_vals), 0x0, "", HFILL }},
{ &hf_fr_pid, {
"Protocol ID", "fr.snap.pid", FT_UINT16, BASE_HEX,
NULL, 0x0, "", HFILL }},
{ &hf_fr_snaptype, {
"Type", "fr.snaptype", FT_UINT16, BASE_HEX,
VALS(etype_vals), 0x0, "Frame Relay SNAP Encapsulated Protocol", HFILL }},
{ &hf_fr_chdlctype, {
"Type", "fr.chdlctype", FT_UINT16, BASE_HEX,
VALS(chdlc_vals), 0x0, "Frame Relay Cisco HDLC Encapsulated Protocol", HFILL }},
};
/* Setup protocol subtree array */
static gint *ett[] = {
&ett_fr,
&ett_fr_address,
&ett_fr_control,
};
static enum_val_t fr_encap_options[] = {
{ "frf-3.2", "FRF 3.2/Cisco HDLC", FRF_3_2 },
{ "gprs-ns", "GPRS Network Service", GPRS_NS },
{ "ethernet", "Raw Ethernet", RAW_ETHER },
{ NULL, NULL, 0 },
};
module_t *frencap_module;
proto_fr = proto_register_protocol("Frame Relay", "FR", "fr");
proto_register_field_array(proto_fr, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
fr_subdissector_table = register_dissector_table("fr.ietf",
"Frame Relay NLPID", FT_UINT8, BASE_HEX);
fr_osinl_subdissector_table = register_dissector_table("fr.osinl",
"Frame Relay OSI NLPID", FT_UINT8, BASE_HEX);
register_dissector("fr_uncompressed", dissect_fr_uncompressed, proto_fr);
register_dissector("fr", dissect_fr, proto_fr);
frencap_module = prefs_register_protocol(proto_fr, NULL);
prefs_register_enum_preference(frencap_module, "encap", "Encapsulation",
"Encapsulation", &fr_encap,
fr_encap_options, FALSE);
}
void proto_reg_handoff_fr(void)
{
dissector_handle_t fr_handle, fr_phdr_handle;
fr_handle = create_dissector_handle(dissect_fr, proto_fr);
dissector_add("gre.proto", GRE_FR, fr_handle);
dissector_add("wtap_encap", WTAP_ENCAP_FRELAY, fr_handle);
fr_phdr_handle = create_dissector_handle(dissect_fr_phdr, proto_fr);
dissector_add("wtap_encap", WTAP_ENCAP_FRELAY_WITH_PHDR, fr_phdr_handle);
eth_handle = find_dissector("eth");
gprs_ns_handle = find_dissector("gprs_ns");
data_handle = find_dissector("data");
osinl_subdissector_table = find_dissector_table("osinl");
}
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