This dissector properly reads NetFlow version 5 and can be
enhanced to handle version 1, 7, 8, and with a bit more work
version 9. I have a lot of code that processes the different
versions, and I'd be happy to continue to make this dissector
better if it makes it into the tree.
The patch to 0.9.6-current is trivial: just added the source file
to Makefile.am and Makefile.nmake and two new files, packet-netflow.h
and packet-netflow.c.
I realize that there is no default port for NetFlow exports, so
I have set default value to port 5000.
Patch and files below.
mattSMART
Index: Makefile.am
===================================================================
RCS file: /cvsroot/ethereal/Makefile.am,v
retrieving revision 1.466
diff -u -r1.466 Makefile.am
--- Makefile.am 2002/09/04 09:40:24 1.466
+++ Makefile.am 2002/09/04 19:23:53
@@ -226,6 +226,7 @@
packet-ncp2222.c \
packet-ndmp.c \
packet-netbios.c \
+ packet-netflow.c \
packet-nfs.c \
packet-nfsacl.c \
packet-nfsauth.c \
Index: Makefile.nmake
===================================================================
RCS file: /cvsroot/ethereal/Makefile.nmake,v
retrieving revision 1.205
diff -u -r1.205 Makefile.nmake
--- Makefile.nmake 2002/09/04 09:40:24 1.205
+++ Makefile.nmake 2002/09/04 19:23:53
@@ -167,6 +167,7 @@
packet-ncp2222.c \
packet-ndmp.c \
packet-netbios.c \
+ packet-netflow.c \
packet-nfs.c \
packet-nfsacl.c \
packet-nfsauth.c \
Index: packet-netflow.h
===================================================================
/* packet-netflow.h
* Routines for Cisco NetFlow packet disassembly
* Matthew Smart <[EMAIL PROTECTED]>
*
* $Id: $
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <[EMAIL PROTECTED]>
* 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.
*/
#ifndef __PACKET_NETFLOW_H
#define __PACKET_NETFLOW_H
#include <glib.h>
#define UDP_PORT_NETFLOW 5000 /* XXX */
struct netflow5_hdr {
guint16 version;
guint16 count; /* Number of records */
guint32 sys_uptime; /* Time in msec since router booted */
guint32 unix_sec; /* Seconds since 0000 UTC 1970 */
guint32 unix_nsec; /* Residual nsec since 0000 UTC 1970 */
guint32 flow_sequence; /* Sequence num of flows seen */
guint8 engine_type; /* Type of flow switching engine */
guint8 engine_id; /* Slot number of switching engine */
guint16 reserved;
};
struct netflow5_rec {
guint32 src_addr;
guint32 dst_addr;
guint32 next_hop;
guint16 input_iface;
guint16 output_iface;
guint32 pkts_sent; /* Between start_time and end_time */
guint32 bytes_sent; /* Between start_time and end_time */
guint32 start_time; /* Milliseconds since sys_uptime */
guint32 end_time; /* Milliseconds since sys_uptime */
guint16 src_port;
guint16 dst_port;
guint8 pad1;
guint8 tcp_flags;
guint8 ip_prot;
guint8 tos;
guint16 src_as;
guint16 dst_as;
guint8 src_mask;
guint8 dst_mask;
guint16 pad2;
};
#endif
Index: packet-netflow.c
===================================================================
/* packet-netflow.c
* Routines for Cisco NetFlow packet disassembly
* Matthew Smart <[EMAIL PROTECTED]>
*
* $Id: $
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <[EMAIL PROTECTED]>
* 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
#include <glib.h>
#include <epan/packet.h>
#include <stdio.h>
#include <string.h>
#include "packet-netflow.h"
static int proto_netflow = -1;
static int hf_netflow_version = -1;
static int hf_netflow_count = -1;
static int hf_netflow_sys_uptime = -1;
static int hf_netflow_unix_sec = -1;
static int hf_netflow_unix_nsec = -1;
static int hf_netflow_flow_sequence = -1;
static int hf_netflow_record = -1;
static gint ett_netflow = -1;
static gint ett_netflow_rec = -1;
static void
dissect_netflow(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
proto_tree *netflow_tree = NULL;
proto_tree *netflow_rec_tree = NULL;
proto_item *ti = NULL, *tf = NULL;
gint offset = 0;
struct netflow5_hdr nfh;
struct netflow5_rec nfr;
guint16 nfh_version, nfh_count;
guint32 nfh_sys_uptime, nfh_unix_sec, nfh_unix_nsec;
guint32 nfh_sequence;
int i;
if (check_col(pinfo->cinfo, COL_PROTOCOL))
col_set_str(pinfo->cinfo, COL_PROTOCOL, "NetFlow");
if (check_col(pinfo->cinfo, COL_INFO))
col_clear(pinfo->cinfo, COL_INFO);
/* Determine NetFlow version and number of records */
tvb_memcpy(tvb, (guint8 *)&nfh, offset, sizeof(nfh));
nfh_version = ntohs(nfh.version);
nfh_count = ntohs(nfh.count);
nfh_sys_uptime = ntohl(nfh.sys_uptime);
nfh_unix_sec = ntohl(nfh.unix_sec);
nfh_unix_nsec = ntohl(nfh.unix_nsec);
nfh_sequence = ntohl(nfh.flow_sequence);
if (check_col(pinfo->cinfo, COL_INFO))
col_add_fstr(pinfo->cinfo, COL_INFO,
"v%u, %u records, sequence number %u",
nfh_version, nfh_count, nfh_sequence);
if (tree != NULL) {
/* Add NetFlow to to the tree */
ti = proto_tree_add_protocol_format(tree, proto_netflow, tvb,
offset, sizeof(nfh.version) + sizeof(nfh.count)*sizeof(nfr),
"Cisco Netflow, v%u, %u records, sequence number %u",
nfh_version, nfh_count, nfh_sequence);
netflow_tree = proto_item_add_subtree(ti, ett_netflow);
/* Version */
proto_tree_add_uint(netflow_tree, hf_netflow_version,
tvb, offset, sizeof(nfh.version), nfh_version);
/* Number of records */
proto_tree_add_uint(netflow_tree, hf_netflow_count,
tvb, offset + 2, sizeof(nfh.count), nfh_count);
/* XXX only support version 5 right now */
if (nfh_version != 5)
return;
/* System (router) uptime */
proto_tree_add_uint_format(netflow_tree, hf_netflow_sys_uptime,
tvb, offset + 4, sizeof(nfh.sys_uptime), nfh_sys_uptime,
"System uptime: %u msec", nfh_sys_uptime);
/* Unix time in seconds */
proto_tree_add_uint_format(netflow_tree, hf_netflow_unix_sec,
tvb, offset + 8, sizeof(nfh.unix_sec), nfh_unix_sec,
"Unix time: %u seconds", nfh_unix_sec);
/* Unix time in seconds */
proto_tree_add_uint_format(netflow_tree, hf_netflow_unix_nsec,
tvb, offset + 12, sizeof(nfh.unix_nsec), nfh_unix_nsec,
"Residual: %u nanoseconds", nfh_unix_nsec);
for (i = 0; i < nfh_count; i++) {
guint rec_offset = sizeof(nfh) + i * sizeof(nfr);
tf = proto_tree_add_uint_format(netflow_tree,
hf_netflow_record, tvb, rec_offset, sizeof(nfr),
i, "Record %d: %u packets, %u bytes", i+1,
tvb_get_ntohl(tvb, rec_offset + 16),
tvb_get_ntohl(tvb, rec_offset + 20));
netflow_rec_tree = proto_item_add_subtree(tf,
ett_netflow_rec);
proto_tree_add_text(netflow_rec_tree, tvb,
rec_offset + 0, 4, "Src Addr: %s",
ip_to_str(tvb_get_ptr(tvb, rec_offset + 0, 4)));
proto_tree_add_text(netflow_rec_tree, tvb,
rec_offset + 4, 4, "Dst Addr: %s",
ip_to_str(tvb_get_ptr(tvb, rec_offset + 4, 4)));
proto_tree_add_text(netflow_rec_tree, tvb,
rec_offset + 8, 4, "Next Hop: %s",
ip_to_str(tvb_get_ptr(tvb, rec_offset + 8, 4)));
proto_tree_add_text(netflow_rec_tree, tvb,
rec_offset + 12, 2, "Input Interface: %u",
tvb_get_ntohs(tvb, rec_offset + 12));
proto_tree_add_text(netflow_rec_tree, tvb,
rec_offset + 14, 2, "Output Interface: %u",
tvb_get_ntohs(tvb, rec_offset + 14));
proto_tree_add_text(netflow_rec_tree, tvb,
rec_offset + 16, 4, "Packets: %u",
tvb_get_ntohl(tvb, rec_offset + 16));
proto_tree_add_text(netflow_rec_tree, tvb,
rec_offset + 20, 4, "Bytes: %u",
tvb_get_ntohl(tvb, rec_offset + 20));
proto_tree_add_text(netflow_rec_tree, tvb,
rec_offset + 24, 4, "Start Time: %u",
tvb_get_ntohl(tvb, rec_offset + 24));
proto_tree_add_text(netflow_rec_tree, tvb,
rec_offset + 28, 4, "End Time: %u",
tvb_get_ntohl(tvb, rec_offset + 28));
proto_tree_add_text(netflow_rec_tree, tvb,
rec_offset + 32, 2, "Source Port: %u",
tvb_get_ntohs(tvb, rec_offset + 32));
proto_tree_add_text(netflow_rec_tree, tvb,
rec_offset + 34, 2, "Dest Port: %u",
tvb_get_ntohs(tvb, rec_offset + 34));
proto_tree_add_text(netflow_rec_tree, tvb,
rec_offset + 37, 1, "TCP Flags: 0x%0x",
tvb_get_guint8(tvb, rec_offset + 37));
proto_tree_add_text(netflow_rec_tree, tvb,
rec_offset + 38, 1, "IP Protocol: %u",
tvb_get_guint8(tvb, rec_offset + 38));
proto_tree_add_text(netflow_rec_tree, tvb,
rec_offset + 39, 1, "Type of service: 0x%02x",
tvb_get_guint8(tvb, rec_offset + 39));
proto_tree_add_text(netflow_rec_tree, tvb,
rec_offset + 40, 2, "Source AS: %u",
tvb_get_ntohs(tvb, rec_offset + 40));
proto_tree_add_text(netflow_rec_tree, tvb,
rec_offset + 42, 2, "Dest AS: %u",
tvb_get_ntohs(tvb, rec_offset + 42));
proto_tree_add_text(netflow_rec_tree, tvb,
rec_offset + 44, 1, "Source Mask: %u",
tvb_get_guint8(tvb, rec_offset + 44));
proto_tree_add_text(netflow_rec_tree, tvb,
rec_offset + 45, 1, "Dest Mask: %u",
tvb_get_guint8(tvb, rec_offset + 45));
}
}
}
void
proto_register_netflow(void)
{
static hf_register_info hf[] = {
{ &hf_netflow_version,
{ "Version", "netflow.version", FT_UINT16,
BASE_DEC, NULL, 0x0, "", HFILL }},
{ &hf_netflow_count,
{ "Number of records", "netflow.count", FT_UINT16,
BASE_DEC, NULL, 0x0, "", HFILL }},
{ &hf_netflow_sys_uptime,
{ "System uptime", "netflow.sys_uptime", FT_UINT32,
BASE_DEC, NULL, 0x0, "", HFILL }},
{ &hf_netflow_unix_sec,
{ "Unix seconds", "netflow.unix_sec", FT_UINT32,
BASE_DEC, NULL, 0x0, "", HFILL }},
{ &hf_netflow_unix_nsec,
{ "Unix nanonseconds", "netflow.unix_nsec", FT_UINT32,
BASE_DEC, NULL, 0x0, "", HFILL }},
{ &hf_netflow_flow_sequence,
{ "Sequence number", "netflow.flow_sequence", FT_UINT32,
BASE_DEC, NULL, 0x0, "", HFILL }},
{ &hf_netflow_record,
{ "Record", "netflow.record", FT_UINT32,
BASE_DEC, NULL, 0x0, "", HFILL }},
};
static gint *ett[] = {
&ett_netflow,
&ett_netflow_rec
};
proto_netflow = proto_register_protocol("Cisco NetFlow",
"NetFlow", "netflow");
proto_register_field_array(proto_netflow, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
}
void
proto_reg_handoff_netflow(void)
{
dissector_handle_t netflow_handle;
netflow_handle = create_dissector_handle(dissect_netflow,
proto_netflow);
dissector_add("udp.port", UDP_PORT_NETFLOW, netflow_handle);
}
