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wireshark/packet-atm.c
Guy Harris ee5ca25d31 Include files from the "epan" directory and subdirectories thereof with 
"epan/..." pathnames, so as to avoid collisions with header files in any
of the directories in which we look (e.g., "proto.h", as some other
package has its own "proto.h" file which it installs in the top-level
include directory).

Don't add "-I" flags to search "epan", as that's no longer necessary
(and we want includes of "epan" headers to fail if the "epan/" is left
out, so that we don't re-introduce includes lacking "epan/").

svn path=/trunk/; revision=4586
2002-01-21 07:37:49 +00:00

818 lines
25 KiB
C
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/* packet-atm.c
* Routines for ATM packet disassembly
*
* $Id: packet-atm.c,v 1.40 2002/01/21 07:36:32 guy Exp $
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@ethereal.com>
* Copyright 1998 Gerald Combs
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#ifdef HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif
#include <stdio.h>
#include <glib.h>
#include <epan/packet.h>
#include "oui.h"
#include <epan/resolv.h>
#include "packet-snmp.h"
static int proto_atm = -1;
static int hf_atm_vpi = -1;
static int hf_atm_vci = -1;
static int proto_atm_lane = -1;
static int proto_ilmi = -1;
static gint ett_atm = -1;
static gint ett_atm_lane = -1;
static gint ett_atm_lane_lc_lan_dest = -1;
static gint ett_atm_lane_lc_lan_dest_rd = -1;
static gint ett_atm_lane_lc_flags = -1;
static gint ett_atm_lane_lc_tlv = -1;
static gint ett_ilmi = -1;
static dissector_handle_t eth_handle;
static dissector_handle_t tr_handle;
static dissector_handle_t llc_handle;
static dissector_handle_t sscop_handle;
static dissector_handle_t lane_handle;
static dissector_handle_t ilmi_handle;
static dissector_handle_t data_handle;
/*
* See
*
* http://www.atmforum.org/atmforum/specs/approved.html
*
* for a number of ATM Forum specifications, e.g. the LAN Emulation
* over ATM 1.0 spec, whence I got most of this.
*/
/* LE Control opcodes */
#define LE_CONFIGURE_REQUEST 0x0001
#define LE_CONFIGURE_RESPONSE 0x0101
#define LE_JOIN_REQUEST 0x0002
#define LE_JOIN_RESPONSE 0x0102
#define READY_QUERY 0x0003
#define READY_IND 0x0103
#define LE_REGISTER_REQUEST 0x0004
#define LE_REGISTER_RESPONSE 0x0104
#define LE_UNREGISTER_REQUEST 0x0005
#define LE_UNREGISTER_RESPONSE 0x0105
#define LE_ARP_REQUEST 0x0006
#define LE_ARP_RESPONSE 0x0106
#define LE_FLUSH_REQUEST 0x0007
#define LE_FLUSH_RESPONSE 0x0107
#define LE_NARP_REQUEST 0x0008
#define LE_TOPOLOGY_REQUEST 0x0009
static const value_string le_control_opcode_vals[] = {
{ LE_CONFIGURE_REQUEST, "LE_CONFIGURE_REQUEST" },
{ LE_CONFIGURE_RESPONSE, "LE_CONFIGURE_RESPONSE" },
{ LE_JOIN_REQUEST, "LE_JOIN_REQUEST" },
{ LE_JOIN_RESPONSE, "LE_JOIN_RESPONSE" },
{ READY_QUERY, "READY_QUERY" },
{ READY_IND, "READY_IND" },
{ LE_REGISTER_REQUEST, "LE_REGISTER_REQUEST" },
{ LE_REGISTER_RESPONSE, "LE_REGISTER_RESPONSE" },
{ LE_UNREGISTER_REQUEST, "LE_UNREGISTER_REQUEST" },
{ LE_UNREGISTER_RESPONSE, "LE_UNREGISTER_RESPONSE" },
{ LE_ARP_REQUEST, "LE_ARP_REQUEST" },
{ LE_ARP_RESPONSE, "LE_ARP_RESPONSE" },
{ LE_FLUSH_REQUEST, "LE_FLUSH_REQUEST" },
{ LE_FLUSH_RESPONSE, "LE_FLUSH_RESPONSE" },
{ LE_NARP_REQUEST, "LE_NARP_REQUEST" },
{ LE_TOPOLOGY_REQUEST, "LE_TOPOLOGY_REQUEST" },
{ 0, NULL }
};
/* LE Control statuses */
static const value_string le_control_status_vals[] = {
{ 0, "Success" },
{ 1, "Version not supported" },
{ 2, "Invalid request parameters" },
{ 4, "Duplicate LAN destination registration" },
{ 5, "Duplicate ATM address" },
{ 6, "Insufficient resources to grant request" },
{ 7, "Access denied" },
{ 8, "Invalid REQUESTOR-ID" },
{ 9, "Invalid LAN destination" },
{ 10, "Invalid ATM address" },
{ 20, "No configuraton" },
{ 21, "LE_CONFIGURE error" },
{ 22, "Insufficient information" },
{ 0, NULL }
};
/* LE Control LAN destination tags */
#define TAG_NOT_PRESENT 0x0000
#define TAG_MAC_ADDRESS 0x0001
#define TAG_ROUTE_DESCRIPTOR 0x0002
static const value_string le_control_landest_tag_vals[] = {
{ TAG_NOT_PRESENT, "Not present" },
{ TAG_MAC_ADDRESS, "MAC address" },
{ TAG_ROUTE_DESCRIPTOR, "Route descriptor" },
{ 0, NULL }
};
/* LE Control LAN types */
#define LANT_UNSPEC 0x00
#define LANT_802_3 0x01
#define LANT_802_5 0x02
static const value_string le_control_lan_type_vals[] = {
{ LANT_UNSPEC, "Unspecified" },
{ LANT_802_3, "Ethernet/802.3" },
{ LANT_802_5, "802.5" },
{ 0, NULL }
};
static void
dissect_le_client(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
proto_item *ti;
proto_tree *lane_tree;
if (tree) {
ti = proto_tree_add_protocol_format(tree, proto_atm_lane, tvb, 0, 2, "ATM LANE");
lane_tree = proto_item_add_subtree(ti, ett_atm_lane);
proto_tree_add_text(lane_tree, tvb, 0, 2, "LE Client: 0x%04X",
tvb_get_ntohs(tvb, 0));
}
}
static void
dissect_lan_destination(tvbuff_t *tvb, int offset, const char *type, proto_tree *tree)
{
proto_item *td;
proto_tree *dest_tree;
guint16 tag;
proto_item *trd;
proto_tree *rd_tree;
guint16 route_descriptor;
td = proto_tree_add_text(tree, tvb, offset, 8, "%s LAN destination",
type);
dest_tree = proto_item_add_subtree(td, ett_atm_lane_lc_lan_dest);
tag = tvb_get_ntohs(tvb, offset);
proto_tree_add_text(dest_tree, tvb, offset, 2, "Tag: %s",
val_to_str(tag, le_control_landest_tag_vals,
"Unknown (0x%04X)"));
offset += 2;
switch (tag) {
case TAG_MAC_ADDRESS:
proto_tree_add_text(dest_tree, tvb, offset, 6, "MAC address: %s",
ether_to_str(tvb_get_ptr(tvb, offset, 6)));
break;
case TAG_ROUTE_DESCRIPTOR:
offset += 4;
route_descriptor = tvb_get_ntohs(tvb, offset);
trd = proto_tree_add_text(dest_tree, tvb, offset, 2, "Route descriptor: 0x%02X",
route_descriptor);
rd_tree = proto_item_add_subtree(td, ett_atm_lane_lc_lan_dest_rd);
proto_tree_add_text(rd_tree, tvb, offset, 2,
decode_numeric_bitfield(route_descriptor, 0xFFF0, 2*8,
"LAN ID = %u"));
proto_tree_add_text(rd_tree, tvb, offset, 2,
decode_numeric_bitfield(route_descriptor, 0x000F, 2*8,
"Bridge number = %u"));
break;
}
}
/*
* TLV values in LE Control frames.
*/
#define TLV_TYPE(oui, ident) (((oui) << 8) | (ident))
#define LE_CONTROL_TIMEOUT TLV_TYPE(OUI_ATM_FORUM, 0x01)
#define LE_MAX_UNK_FRAME_COUNT TLV_TYPE(OUI_ATM_FORUM, 0x02)
#define LE_MAX_UNK_FRAME_TIME TLV_TYPE(OUI_ATM_FORUM, 0x03)
#define LE_VCC_TIMEOUT_PERIOD TLV_TYPE(OUI_ATM_FORUM, 0x04)
#define LE_MAX_RETRY_COUNT TLV_TYPE(OUI_ATM_FORUM, 0x05)
#define LE_AGING_TIME TLV_TYPE(OUI_ATM_FORUM, 0x06)
#define LE_FORWARD_DELAY_TIME TLV_TYPE(OUI_ATM_FORUM, 0x07)
#define LE_EXPECTED_ARP_RESPONSE_TIME TLV_TYPE(OUI_ATM_FORUM, 0x08)
#define LE_FLUSH_TIMEOUT TLV_TYPE(OUI_ATM_FORUM, 0x09)
#define LE_PATH_SWITCHING_DELAY TLV_TYPE(OUI_ATM_FORUM, 0x0A)
#define LE_LOCAL_SEGMENT_ID TLV_TYPE(OUI_ATM_FORUM, 0x0B)
#define LE_MCAST_SEND_VCC_TYPE TLV_TYPE(OUI_ATM_FORUM, 0x0C)
#define LE_MCAST_SEND_VCC_AVGRATE TLV_TYPE(OUI_ATM_FORUM, 0x0D)
#define LE_MCAST_SEND_VCC_PEAKRATE TLV_TYPE(OUI_ATM_FORUM, 0x0E)
#define LE_CONN_COMPLETION_TIMER TLV_TYPE(OUI_ATM_FORUM, 0x0F)
static const value_string le_tlv_type_vals[] = {
{ LE_CONTROL_TIMEOUT, "Control Time-out" },
{ LE_MAX_UNK_FRAME_COUNT, "Maximum Unknown Frame Count" },
{ LE_MAX_UNK_FRAME_TIME, "Maximum Unknown Frame Time" },
{ LE_VCC_TIMEOUT_PERIOD, "VCC Time-out" },
{ LE_MAX_RETRY_COUNT, "Maximum Retry Count" },
{ LE_AGING_TIME, "Aging Time" },
{ LE_FORWARD_DELAY_TIME, "Forwarding Delay Time" },
{ LE_EXPECTED_ARP_RESPONSE_TIME, "Expected LE_ARP Response Time" },
{ LE_FLUSH_TIMEOUT, "Flush Time-out" },
{ LE_PATH_SWITCHING_DELAY, "Path Switching Delay" },
{ LE_LOCAL_SEGMENT_ID, "Local Segment ID" },
{ LE_MCAST_SEND_VCC_TYPE, "Mcast Send VCC Type" },
{ LE_MCAST_SEND_VCC_AVGRATE, "Mcast Send VCC AvgRate" },
{ LE_MCAST_SEND_VCC_PEAKRATE, "Mcast Send VCC PeakRate" },
{ LE_CONN_COMPLETION_TIMER, "Connection Completion Timer" },
{ 0, NULL },
};
static void
dissect_le_control(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
proto_item *ti;
proto_tree *lane_tree;
int offset = 0;
proto_item *tf;
proto_tree *flags_tree;
proto_item *ttlv;
proto_tree *tlv_tree;
guint16 opcode;
guint16 flags;
guint8 num_tlvs;
guint32 tlv_type;
guint8 tlv_length;
if (check_col(pinfo->cinfo, COL_INFO))
col_set_str(pinfo->cinfo, COL_INFO, "LE Control");
if (tree) {
ti = proto_tree_add_protocol_format(tree, proto_atm_lane, tvb, offset, 108, "ATM LANE");
lane_tree = proto_item_add_subtree(ti, ett_atm_lane);
proto_tree_add_text(lane_tree, tvb, offset, 2, "Marker: 0x%04X",
tvb_get_ntohs(tvb, offset));
offset += 2;
proto_tree_add_text(lane_tree, tvb, offset, 1, "Protocol: 0x%02X",
tvb_get_guint8(tvb, offset));
offset += 1;
proto_tree_add_text(lane_tree, tvb, offset, 1, "Version: 0x%02X",
tvb_get_guint8(tvb, offset));
offset += 1;
opcode = tvb_get_ntohs(tvb, offset);
proto_tree_add_text(lane_tree, tvb, offset, 2, "Opcode: %s",
val_to_str(opcode, le_control_opcode_vals,
"Unknown (0x%04X)"));
offset += 2;
if (opcode == READY_QUERY || opcode == READY_IND) {
/* There's nothing more in this packet. */
return;
}
if (opcode & 0x0100) {
/* Response; decode status. */
proto_tree_add_text(lane_tree, tvb, offset, 2, "Status: %s",
val_to_str(tvb_get_ntohs(tvb, offset), le_control_status_vals,
"Unknown (0x%04X)"));
}
offset += 2;
proto_tree_add_text(lane_tree, tvb, offset, 4, "Transaction ID: 0x%08X",
tvb_get_ntohl(tvb, offset));
offset += 4;
proto_tree_add_text(lane_tree, tvb, offset, 2, "Requester LECID: 0x%04X",
tvb_get_ntohs(tvb, offset));
offset += 2;
flags = tvb_get_ntohs(tvb, offset);
tf = proto_tree_add_text(lane_tree, tvb, offset, 2, "Flags: 0x%04X",
flags);
flags_tree = proto_item_add_subtree(tf, ett_atm_lane_lc_flags);
proto_tree_add_text(flags_tree, tvb, offset, 2, "%s",
decode_boolean_bitfield(flags, 0x0001, 8*2,
"Remote address", "Local address"));
proto_tree_add_text(flags_tree, tvb, offset, 2, "%s",
decode_boolean_bitfield(flags, 0x0080, 8*2,
"Proxy", "Not proxy"));
proto_tree_add_text(flags_tree, tvb, offset, 2, "%s",
decode_boolean_bitfield(flags, 0x0100, 8*2,
"Topology change", "No topology change"));
offset += 2;
dissect_lan_destination(tvb, offset, "Source", lane_tree);
offset += 8;
dissect_lan_destination(tvb, offset, "Target", lane_tree);
offset += 8;
proto_tree_add_text(lane_tree, tvb, offset, 20, "Source ATM Address: %s",
tvb_bytes_to_str(tvb, offset, 20));
offset += 20;
proto_tree_add_text(lane_tree, tvb, offset, 1, "LAN type: %s",
val_to_str(tvb_get_guint8(tvb, offset), le_control_lan_type_vals,
"Unknown (0x%02X)"));
offset += 1;
proto_tree_add_text(lane_tree, tvb, offset, 1, "Maximum frame size: %u",
tvb_get_guint8(tvb, offset));
offset += 1;
num_tlvs = tvb_get_guint8(tvb, offset);
proto_tree_add_text(lane_tree, tvb, offset, 1, "Number of TLVs: %u",
num_tlvs);
offset += 1;
proto_tree_add_text(lane_tree, tvb, offset, 1, "ELAN name size: %u",
tvb_get_guint8(tvb, offset));
offset += 1;
proto_tree_add_text(lane_tree, tvb, offset, 20, "Target ATM Address: %s",
tvb_bytes_to_str(tvb, offset, 20));
offset += 20;
proto_tree_add_text(lane_tree, tvb, offset, 32, "ELAN name: %s",
tvb_bytes_to_str(tvb, offset, 32));
offset += 32;
while (num_tlvs != 0) {
tlv_type = tvb_get_ntohl(tvb, offset);
tlv_length = tvb_get_guint8(tvb, offset+4);
ttlv = proto_tree_add_text(lane_tree, tvb, offset, 5+tlv_length, "TLV type: %s",
val_to_str(tlv_type, le_tlv_type_vals, "Unknown (0x%08x)"));
tlv_tree = proto_item_add_subtree(ttlv, ett_atm_lane_lc_tlv);
proto_tree_add_text(tlv_tree, tvb, offset, 4, "TLV Type: %s",
val_to_str(tlv_type, le_tlv_type_vals, "Unknown (0x%08x)"));
proto_tree_add_text(tlv_tree, tvb, offset+4, 1, "TLV Length: %u", tlv_length);
offset += 5+tlv_length;
num_tlvs--;
}
}
}
static void
dissect_lane(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
tvbuff_t *next_tvb;
tvbuff_t *next_tvb_le_client;
if (check_col(pinfo->cinfo, COL_PROTOCOL))
col_set_str(pinfo->cinfo, COL_PROTOCOL, "ATM LANE");
if (check_col(pinfo->cinfo, COL_INFO))
col_set_str(pinfo->cinfo, COL_INFO, "ATM LANE");
/* Is it LE Control, 802.3, 802.5, or "none of the above"? */
switch (pinfo->pseudo_header->ngsniffer_atm.AppHLType) {
case AHLT_LANE_LE_CTRL:
dissect_le_control(tvb, pinfo, tree);
break;
case AHLT_LANE_802_3:
case AHLT_LANE_802_3_MC:
dissect_le_client(tvb, pinfo, tree);
/* Dissect as Ethernet */
next_tvb_le_client = tvb_new_subset(tvb, 2, -1, -1);
call_dissector(eth_handle, next_tvb_le_client, pinfo, tree);
break;
case AHLT_LANE_802_5:
case AHLT_LANE_802_5_MC:
dissect_le_client(tvb, pinfo, tree);
/* Dissect as Token-Ring */
next_tvb_le_client = tvb_new_subset(tvb, 2, -1, -1);
call_dissector(tr_handle, next_tvb_le_client, pinfo, tree);
break;
default:
/* Dump it as raw data. */
next_tvb = tvb_new_subset(tvb, 0, -1, -1);
call_dissector(data_handle,next_tvb, pinfo, tree);
break;
}
}
static void
dissect_ilmi(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
dissect_snmp_pdu(tvb, 0, pinfo, tree, "ILMI", proto_ilmi, ett_ilmi);
}
/* AAL types */
static const value_string aal_vals[] = {
{ ATT_AAL_UNKNOWN, "Unknown AAL" },
{ ATT_AAL1, "AAL1" },
{ ATT_AAL3_4, "AAL3/4" },
{ ATT_AAL5, "AAL5" },
{ ATT_AAL_USER, "User AAL" },
{ ATT_AAL_SIGNALLING, "Signalling AAL" },
{ ATT_OAMCELL, "OAM cell" },
{ 0, NULL }
};
/* AAL5 higher-level traffic types */
static const value_string aal5_hltype_vals[] = {
{ ATT_HL_UNKNOWN, "Unknown traffic type" },
{ ATT_HL_LLCMX, "LLC multiplexed" },
{ ATT_HL_VCMX, "VC multiplexed" },
{ ATT_HL_LANE, "LANE" },
{ ATT_HL_ILMI, "ILMI" },
{ ATT_HL_FRMR, "Frame Relay" },
{ ATT_HL_SPANS, "FORE SPANS" },
{ ATT_HL_IPSILON, "Ipsilon" },
{ 0, NULL }
};
/* Traffic subtypes for VC multiplexed traffic */
static const value_string vcmx_type_vals[] = {
{ AHLT_UNKNOWN, "Unknown VC multiplexed traffic type" },
{ AHLT_VCMX_802_3_FCS, "802.3 FCS" },
{ AHLT_VCMX_802_4_FCS, "802.4 FCS" },
{ AHLT_VCMX_802_5_FCS, "802.5 FCS" },
{ AHLT_VCMX_FDDI_FCS, "FDDI FCS" },
{ AHLT_VCMX_802_6_FCS, "802.6 FCS" },
{ AHLT_VCMX_802_3, "802.3" },
{ AHLT_VCMX_802_4, "802.4" },
{ AHLT_VCMX_802_5, "802.5" },
{ AHLT_VCMX_FDDI, "FDDI" },
{ AHLT_VCMX_802_6, "802.6" },
{ AHLT_VCMX_FRAGMENTS, "Fragments" },
{ AHLT_VCMX_BPDU, "BPDU" },
{ 0, NULL }
};
/* Traffic subtypes for LANE traffic */
static const value_string lane_type_vals[] = {
{ AHLT_UNKNOWN, "Unknown LANE traffic type" },
{ AHLT_LANE_LE_CTRL, "LE Control" },
{ AHLT_LANE_802_3, "802.3" },
{ AHLT_LANE_802_5, "802.5" },
{ AHLT_LANE_802_3_MC, "802.3 multicast" },
{ AHLT_LANE_802_5_MC, "802.5 multicast" },
{ 0, NULL }
};
/* Traffic subtypes for Ipsilon traffic */
static const value_string ipsilon_type_vals[] = {
{ AHLT_UNKNOWN, "Unknown Ipsilon traffic type" },
{ AHLT_IPSILON_FT0, "Flow type 0" },
{ AHLT_IPSILON_FT1, "Flow type 1" },
{ AHLT_IPSILON_FT2, "Flow type 2" },
{ 0, NULL }
};
/*
* We don't know what kind of traffic this is; try to guess.
* We at least know it's AAL5....
*/
static void
atm_guess_content(tvbuff_t *tvb, packet_info *pinfo)
{
guint8 byte0, byte1, byte2;
if (pinfo->pseudo_header->ngsniffer_atm.Vpi == 0) {
/*
* Traffic on some PVCs with a VPI of 0 and certain
* VCIs is of particular types.
*/
switch (pinfo->pseudo_header->ngsniffer_atm.Vci) {
case 5:
/*
* Signalling AAL.
*/
pinfo->pseudo_header->ngsniffer_atm.AppTrafType =
ATT_AAL_SIGNALLING;
return;
case 16:
/*
* ILMI.
*/
pinfo->pseudo_header->ngsniffer_atm.AppTrafType |=
ATT_HL_ILMI;
return;
}
}
/*
* OK, we can't tell what it is based on the VPI/VCI; try
* guessing based on the contents.
*/
byte0 = tvb_get_guint8(tvb, 0);
byte1 = tvb_get_guint8(tvb, 1);
byte2 = tvb_get_guint8(tvb, 2);
if (byte0 == 0xaa && byte1 == 0xaa && byte2 == 0x03) {
/*
* Looks like a SNAP header; assume it's LLC multiplexed
* RFC 1483 traffic.
*/
pinfo->pseudo_header->ngsniffer_atm.AppTrafType |= ATT_HL_LLCMX;
} else {
/*
* Assume it's LANE.
*/
pinfo->pseudo_header->ngsniffer_atm.AppTrafType |= ATT_HL_LANE;
if (byte0 == 0xff && byte1 == 0x00) {
/*
* Looks like LE Control traffic.
*/
pinfo->pseudo_header->ngsniffer_atm.AppHLType =
AHLT_LANE_LE_CTRL;
} else {
/*
* XXX - Ethernet, or Token Ring?
* Assume Ethernet for now; if we see earlier
* LANE traffic, we may be able to figure out
* the traffic type from that, but there may
* still be situations where the user has to
* tell us.
*/
pinfo->pseudo_header->ngsniffer_atm.AppHLType =
AHLT_LANE_802_3;
}
}
}
static void
dissect_atm(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
proto_tree *atm_tree;
proto_item *ti;
guint aal_type;
guint hl_type;
aal_type = pinfo->pseudo_header->ngsniffer_atm.AppTrafType & ATT_AALTYPE;
hl_type = pinfo->pseudo_header->ngsniffer_atm.AppTrafType & ATT_HLTYPE;
if (aal_type == ATT_AAL5) {
if (hl_type == ATT_HL_UNKNOWN ||
pinfo->pseudo_header->ngsniffer_atm.AppHLType == AHLT_UNKNOWN) {
/*
* The joys of a connection-oriented link layer; the type of
* traffic may be implied by the connection on which it's
* traveling, rather than being specified in the packet itself.
*
* For this packet, the program that captured the packet didn't
* save the type of traffic, presumably because it didn't know
* the traffic type (either it didn't see the connection setup
* and wasn't running on one of the endpoints, and wasn't later
* told, e.g. by the human running it, what type of traffic was
* on that circuit, or was running on one of the endpoints but
* was using, to capture the packets, a mechanism that either
* doesn't have access to data saying what's going over the
* connection or doesn't bother providing that information).
*
* For now, we try to guess the traffic type based on the VPI/VCI
* or the packet header; later, we should provide a mechanism
* by which the user can specify what sort of traffic is on a
* particular circuit.
*/
atm_guess_content(tvb, pinfo);
/*
* OK, now get the AAL type and high-layer type again.
*/
aal_type = pinfo->pseudo_header->ngsniffer_atm.AppTrafType & ATT_AALTYPE;
hl_type = pinfo->pseudo_header->ngsniffer_atm.AppTrafType & ATT_HLTYPE;
}
}
if (check_col(pinfo->cinfo, COL_PROTOCOL))
col_set_str(pinfo->cinfo, COL_PROTOCOL, "ATM");
switch (pinfo->pseudo_header->ngsniffer_atm.channel) {
case 0:
/* Traffic from DCE to DTE. */
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");
break;
case 1:
/* Traffic from DTE to DCE. */
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");
break;
}
if (check_col(pinfo->cinfo, COL_INFO)) {
if (aal_type == ATT_AAL5) {
col_add_fstr(pinfo->cinfo, COL_INFO, "AAL5 %s",
val_to_str(hl_type, aal5_hltype_vals,
"Unknown traffic type (%x)"));
} else {
col_add_str(pinfo->cinfo, COL_INFO,
val_to_str(aal_type, aal_vals, "Unknown AAL (%x)"));
}
}
if (tree) {
ti = proto_tree_add_protocol_format(tree, proto_atm, tvb, 0, 0, "ATM");
atm_tree = proto_item_add_subtree(ti, ett_atm);
proto_tree_add_text(atm_tree, tvb, 0, 0, "AAL: %s",
val_to_str(aal_type, aal_vals, "Unknown AAL (%x)"));
if (aal_type == ATT_AAL5) {
proto_tree_add_text(atm_tree, tvb, 0, 0, "Traffic type: %s",
val_to_str(hl_type, aal5_hltype_vals, "Unknown AAL5 traffic type (%x)"));
switch (hl_type) {
case ATT_HL_LLCMX:
proto_tree_add_text(atm_tree, tvb, 0, 0, "LLC multiplexed traffic");
break;
case ATT_HL_VCMX:
proto_tree_add_text(atm_tree, tvb, 0, 0, "VC multiplexed traffic type: %s",
val_to_str(pinfo->pseudo_header->ngsniffer_atm.AppHLType,
vcmx_type_vals, "Unknown VCMX traffic type (%x)"));
break;
case ATT_HL_LANE:
proto_tree_add_text(atm_tree, tvb, 0, 0, "LANE traffic type: %s",
val_to_str(pinfo->pseudo_header->ngsniffer_atm.AppHLType,
lane_type_vals, "Unknown LANE traffic type (%x)"));
break;
case ATT_HL_IPSILON:
proto_tree_add_text(atm_tree, tvb, 0, 0, "Ipsilon traffic type: %s",
val_to_str(pinfo->pseudo_header->ngsniffer_atm.AppHLType,
ipsilon_type_vals, "Unknown Ipsilon traffic type (%x)"));
break;
}
}
proto_tree_add_uint(atm_tree, hf_atm_vpi, tvb, 0, 0,
pinfo->pseudo_header->ngsniffer_atm.Vpi);
proto_tree_add_uint(atm_tree, hf_atm_vci, tvb, 0, 0,
pinfo->pseudo_header->ngsniffer_atm.Vci);
switch (pinfo->pseudo_header->ngsniffer_atm.channel) {
case 0:
/* Traffic from DCE to DTE. */
proto_tree_add_text(atm_tree, tvb, 0, 0, "Channel: DCE->DTE");
break;
case 1:
/* Traffic from DTE to DCE. */
proto_tree_add_text(atm_tree, tvb, 0, 0, "Channel: DTE->DCE");
break;
default:
/* Sniffers shouldn't provide anything other than 0 or 1. */
proto_tree_add_text(atm_tree, tvb, 0, 0, "Channel: %u",
pinfo->pseudo_header->ngsniffer_atm.channel);
break;
}
if (pinfo->pseudo_header->ngsniffer_atm.cells != 0) {
/*
* If the cell count is 0, assume it means we don't know how
* many cells it was.
*
* XXX - also, if this is AAL5 traffic, assume it means we don't
* know what was in the AAL5 trailer. We may, however, find
* some capture program that can give us the AAL5 trailer
* information but not the cell count, in which case we need
* some other way of indicating whether we have the AAL5 trailer
* information.
*/
proto_tree_add_text(atm_tree, tvb, 0, 0, "Cells: %u",
pinfo->pseudo_header->ngsniffer_atm.cells);
if (aal_type == ATT_AAL5) {
proto_tree_add_text(atm_tree, tvb, 0, 0, "AAL5 U2U: %u",
pinfo->pseudo_header->ngsniffer_atm.aal5t_u2u);
proto_tree_add_text(atm_tree, tvb, 0, 0, "AAL5 len: %u",
pinfo->pseudo_header->ngsniffer_atm.aal5t_len);
proto_tree_add_text(atm_tree, tvb, 0, 0, "AAL5 checksum: 0x%08X",
pinfo->pseudo_header->ngsniffer_atm.aal5t_chksum);
}
}
}
switch (aal_type) {
case ATT_AAL_SIGNALLING:
call_dissector(sscop_handle, tvb, pinfo, tree);
break;
case ATT_AAL5:
switch (hl_type) {
case ATT_HL_LLCMX:
/* Dissect as WTAP_ENCAP_ATM_RFC1483 */
/* The ATM iptrace capture that we have shows LLC at this point,
* so that's what I'm calling */
call_dissector(llc_handle, tvb, pinfo, tree);
break;
case ATT_HL_LANE:
call_dissector(lane_handle, tvb, pinfo, tree);
break;
case ATT_HL_ILMI:
call_dissector(ilmi_handle, tvb, pinfo, tree);
break;
default:
if (tree) {
/* Dump it as raw data. */
call_dissector(data_handle,tvb, pinfo, tree);
break;
}
}
break;
default:
if (tree) {
/* Dump it as raw data. (Is this a single cell?) */
call_dissector(data_handle,tvb, pinfo, tree);
}
break;
}
}
void
proto_register_atm(void)
{
static hf_register_info hf[] = {
{ &hf_atm_vpi,
{ "VPI", "atm.vpi", FT_UINT8, BASE_DEC, NULL, 0x0,
"", HFILL }},
{ &hf_atm_vci,
{ "VCI", "atm.vci", FT_UINT16, BASE_DEC, NULL, 0x0,
"", HFILL }},
};
static gint *ett[] = {
&ett_atm,
&ett_ilmi,
&ett_atm_lane,
&ett_atm_lane_lc_lan_dest,
&ett_atm_lane_lc_lan_dest_rd,
&ett_atm_lane_lc_flags,
&ett_atm_lane_lc_tlv,
};
proto_atm = proto_register_protocol("ATM", "ATM", "atm");
proto_register_field_array(proto_atm, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
proto_ilmi = proto_register_protocol("ILMI", "ILMI", "ilmi");
register_dissector("ilmi", dissect_ilmi, proto_ilmi);
proto_atm_lane = proto_register_protocol("ATM LAN Emulation",
"ATM LANE", "lane");
register_dissector("lane", dissect_lane, proto_atm_lane);
}
void
proto_reg_handoff_atm(void)
{
dissector_handle_t atm_handle;
/*
* Get handles for the Ethernet, Token Ring, LLC, SSCOP, LANE,
* and ILMI dissectors.
*/
eth_handle = find_dissector("eth");
tr_handle = find_dissector("tr");
llc_handle = find_dissector("llc");
sscop_handle = find_dissector("sscop");
lane_handle = find_dissector("lane");
ilmi_handle = find_dissector("ilmi");
data_handle = find_dissector("data");
atm_handle = create_dissector_handle(dissect_atm, proto_atm);
dissector_add("wtap_encap", WTAP_ENCAP_ATM_SNIFFER, atm_handle);
}
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