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/* packet-nflog.c
* Copyright 2011,2012 Jakub Zawadzki <darkjames-ws@darkjames.pl>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998
*
* 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.
*/
#define NEW_PROTO_TREE_API
#include "config.h"
#include <epan/packet.h>
#include <epan/aftypes.h>
#include <wiretap/wtap.h>
void proto_register_nflog(void);
void proto_reg_handoff_nflog(void);
/* nfulnl_attr_type enum from <linux/netfilter/nfnetlink_log.h> */
enum ws_nfulnl_attr_type {
WS_NFULA_UNSPEC,
WS_NFULA_PACKET_HDR,
WS_NFULA_MARK, /* __u32 nfmark */
WS_NFULA_TIMESTAMP, /* nfulnl_msg_packet_timestamp */
WS_NFULA_IFINDEX_INDEV, /* __u32 ifindex */
WS_NFULA_IFINDEX_OUTDEV, /* __u32 ifindex */
WS_NFULA_IFINDEX_PHYSINDEV, /* __u32 ifindex */
WS_NFULA_IFINDEX_PHYSOUTDEV, /* __u32 ifindex */
WS_NFULA_HWADDR, /* nfulnl_msg_packet_hw */
WS_NFULA_PAYLOAD, /* opaque data payload */
WS_NFULA_PREFIX, /* string prefix */
WS_NFULA_UID, /* user id of socket */
WS_NFULA_SEQ, /* instance-local sequence number */
WS_NFULA_SEQ_GLOBAL, /* global sequence number */
WS_NFULA_GID, /* group id of socket */
WS_NFULA_HWTYPE, /* hardware type */
WS_NFULA_HWHEADER, /* hardware header */
WS_NFULA_HWLEN /* hardware header length */
};
static const value_string nflog_tlv_vals[] = {
{ WS_NFULA_UNSPEC, "NFULA_UNSPEC" },
{ WS_NFULA_PACKET_HDR, "NFULA_PACKET_HDR" },
{ WS_NFULA_MARK, "NFULA_MARK" },
{ WS_NFULA_TIMESTAMP, "NFULA_TIMESTAMP" },
{ WS_NFULA_IFINDEX_INDEV, "NFULA_IFINDEX_INDEV" },
{ WS_NFULA_IFINDEX_OUTDEV, "NFULA_IFINDEX_OUTDEV" },
{ WS_NFULA_IFINDEX_PHYSINDEV, "NFULA_IFINDEX_PHYSINDEV" },
{ WS_NFULA_IFINDEX_PHYSOUTDEV, "NFULA_IFINDEX_PHYSOUTDEV" },
{ WS_NFULA_HWADDR, "NFULA_HWADDR" },
{ WS_NFULA_PAYLOAD, "NFULA_PAYLOAD" },
{ WS_NFULA_PREFIX, "NFULA_PREFIX" },
{ WS_NFULA_UID, "NFULA_UID" },
{ WS_NFULA_SEQ, "NFULA_SEQ" },
{ WS_NFULA_SEQ_GLOBAL, "NFULA_SEQ_GLOBAL" },
{ WS_NFULA_GID, "NFULA_GID" },
{ WS_NFULA_HWTYPE, "NFULA_HWTYPE" },
{ WS_NFULA_HWHEADER, "NFULA_HWHEADER" },
{ WS_NFULA_HWLEN, "NFULA_HWLEN" },
{ 0, NULL }
};
static int ett_nflog = -1;
static int ett_nflog_tlv = -1;
static header_field_info *hfi_nflog = NULL;
#define NFLOG_HFI_INIT HFI_INIT(proto_nflog)
/* Header */
static header_field_info hfi_nflog_family NFLOG_HFI_INIT =
{ "Family", "nflog.family", FT_UINT8, BASE_DEC | BASE_EXT_STRING, &linux_af_vals_ext, 0x00, NULL, HFILL };
static header_field_info hfi_nflog_version NFLOG_HFI_INIT =
{ "Version", "nflog.version", FT_UINT8, BASE_DEC, NULL, 0x00, NULL, HFILL };
static header_field_info hfi_nflog_resid NFLOG_HFI_INIT =
{ "Resource id", "nflog.res_id", FT_UINT16, BASE_DEC, NULL, 0x00, NULL, HFILL };
/* TLV */
static header_field_info hfi_nflog_tlv NFLOG_HFI_INIT =
{ "TLV", "nflog.tlv", FT_BYTES, BASE_NONE, NULL, 0x00, NULL, HFILL };
static header_field_info hfi_nflog_tlv_length NFLOG_HFI_INIT =
{ "Length", "nflog.tlv_length", FT_UINT16, BASE_DEC, NULL, 0x00, "TLV Length", HFILL };
static header_field_info hfi_nflog_tlv_type NFLOG_HFI_INIT =
{ "Type", "nflog.tlv_type", FT_UINT16, BASE_DEC, VALS(nflog_tlv_vals), 0x7fff, "TLV Type", HFILL };
/* TLV values */
static header_field_info hfi_nflog_tlv_prefix NFLOG_HFI_INIT =
{ "Prefix", "nflog.prefix", FT_STRINGZ, BASE_NONE, NULL, 0x00, "TLV Prefix Value", HFILL };
static header_field_info hfi_nflog_tlv_uid NFLOG_HFI_INIT =
{ "UID", "nflog.uid", FT_INT32, BASE_DEC, NULL, 0x00, "TLV UID Value", HFILL };
static header_field_info hfi_nflog_tlv_gid NFLOG_HFI_INIT =
{ "GID", "nflog.gid", FT_INT32, BASE_DEC, NULL, 0x00, "TLV GID Value", HFILL };
static header_field_info hfi_nflog_tlv_timestamp NFLOG_HFI_INIT =
{ "Timestamp", "nflog.timestamp", FT_ABSOLUTE_TIME, ABSOLUTE_TIME_LOCAL, NULL, 0x00, "TLV Timestamp Value", HFILL };
static header_field_info hfi_nflog_tlv_unknown NFLOG_HFI_INIT =
{ "Value", "nflog.tlv_value", FT_BYTES, BASE_NONE, NULL, 0x00, "TLV Value", HFILL };
static dissector_handle_t ip_handle;
static dissector_handle_t ip6_handle;
static dissector_handle_t data_handle;
static int
dissect_nflog(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
const int start_tlv_offset = 4;
proto_tree *nflog_tree = NULL;
proto_item *ti;
int offset = 0;
tvbuff_t *next_tvb = NULL;
int aftype;
col_set_str(pinfo->cinfo, COL_PROTOCOL, "NFLOG");
col_clear(pinfo->cinfo, COL_INFO);
aftype = tvb_get_guint8(tvb, 0);
/* Header */
if (proto_field_is_referenced(tree, hfi_nflog->id)) {
ti = proto_tree_add_item(tree, hfi_nflog, tvb, 0, -1, ENC_NA);
nflog_tree = proto_item_add_subtree(ti, ett_nflog);
proto_tree_add_item(nflog_tree, &hfi_nflog_family, tvb, offset, 1, ENC_NA);
offset += 1;
proto_tree_add_item(nflog_tree, &hfi_nflog_version, tvb, offset, 1, ENC_NA);
offset += 1;
proto_tree_add_item(nflog_tree, &hfi_nflog_resid, tvb, offset, 2, ENC_BIG_ENDIAN);
/*offset += 2;*/
}
offset = start_tlv_offset;
/* TLVs */
while (tvb_reported_length_remaining(tvb, offset) >= 4) {
guint16 tlv_len = tvb_get_h_guint16(tvb, offset + 0);
guint16 tlv_type;
guint16 value_len;
proto_tree *tlv_tree;
/* malformed */
if (tlv_len < 4)
return offset;
value_len = tlv_len - 4;
tlv_type = (tvb_get_h_guint16(tvb, offset + 2) & 0x7fff);
if (nflog_tree) {
gboolean handled = FALSE;
ti = proto_tree_add_bytes_format(nflog_tree, hfi_nflog_tlv.id,
tvb, offset, tlv_len, NULL,
"TLV Type: %s (%u), Length: %u",
val_to_str_const(tlv_type, nflog_tlv_vals, "Unknown"),
tlv_type, tlv_len);
tlv_tree = proto_item_add_subtree(ti, ett_nflog_tlv);
proto_tree_add_item(tlv_tree, &hfi_nflog_tlv_length, tvb, offset + 0, 2, ENC_HOST_ENDIAN);
proto_tree_add_item(tlv_tree, &hfi_nflog_tlv_type, tvb, offset + 2, 2, ENC_HOST_ENDIAN);
switch (tlv_type) {
case WS_NFULA_PAYLOAD:
handled = TRUE;
break;
case WS_NFULA_PREFIX:
if (value_len >= 1) {
proto_tree_add_item(tlv_tree, &hfi_nflog_tlv_prefix,
tvb, offset + 4, value_len, ENC_NA);
handled = TRUE;
}
break;
case WS_NFULA_UID:
if (value_len == 4) {
proto_tree_add_item(tlv_tree, &hfi_nflog_tlv_uid,
tvb, offset + 4, value_len, ENC_BIG_ENDIAN);
handled = TRUE;
}
break;
case WS_NFULA_GID:
if (value_len == 4) {
proto_tree_add_item(tlv_tree, &hfi_nflog_tlv_gid,
tvb, offset + 4, value_len, ENC_BIG_ENDIAN);
handled = TRUE;
}
break;
case WS_NFULA_TIMESTAMP:
if (value_len == 16) {
nstime_t ts;
ts.secs = (time_t)tvb_get_ntoh64(tvb, offset + 4);
/* XXX - add an "expert info" warning if this is >= 10^9? */
ts.nsecs = (int)tvb_get_ntoh64(tvb, offset + 12);
proto_tree_add_time(tlv_tree, &hfi_nflog_tlv_timestamp,
tvb, offset + 4, value_len, &ts);
handled = TRUE;
}
break;
}
if (!handled)
proto_tree_add_item(tlv_tree, &hfi_nflog_tlv_unknown,
tvb, offset + 4, value_len, ENC_NA);
}
if (tlv_type == WS_NFULA_PAYLOAD)
next_tvb = tvb_new_subset_length(tvb, offset + 4, value_len);
offset += ((tlv_len + 3) & ~3); /* next TLV aligned to 4B */
}
if (next_tvb) {
switch (aftype) {
case LINUX_AF_INET:
call_dissector(ip_handle, next_tvb, pinfo, tree);
break;
case LINUX_AF_INET6:
call_dissector(ip6_handle, next_tvb, pinfo, tree);
break;
default:
call_dissector(data_handle, next_tvb, pinfo, tree);
break;
}
}
return tvb_captured_length(tvb);
}
void
proto_register_nflog(void)
{
#ifndef HAVE_HFI_SECTION_INIT
static header_field_info *hfi[] = {
/* Header */
&hfi_nflog_family,
&hfi_nflog_version,
&hfi_nflog_resid,
/* TLV */
&hfi_nflog_tlv,
&hfi_nflog_tlv_length,
&hfi_nflog_tlv_type,
/* TLV values */
&hfi_nflog_tlv_prefix,
&hfi_nflog_tlv_uid,
&hfi_nflog_tlv_gid,
&hfi_nflog_tlv_timestamp,
&hfi_nflog_tlv_unknown,
};
#endif
static gint *ett[] = {
&ett_nflog,
&ett_nflog_tlv
};
int proto_nflog;
proto_nflog = proto_register_protocol("Linux Netfilter NFLOG", "NFLOG", "nflog");
hfi_nflog = proto_registrar_get_nth(proto_nflog);
register_dissector("nflog", dissect_nflog, proto_nflog);
proto_register_fields(proto_nflog, hfi, array_length(hfi));
proto_register_subtree_array(ett, array_length(ett));
}
void
proto_reg_handoff_nflog(void)
{
dissector_handle_t nflog_handle;
ip_handle = find_dissector("ip");
ip6_handle = find_dissector("ipv6");
data_handle = find_dissector("data");
nflog_handle = find_dissector("nflog");
dissector_add_uint("wtap_encap", WTAP_ENCAP_NFLOG, nflog_handle);
}
/*
* Editor modelines
*
* Local Variables:
* c-basic-offset: 4
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* ex: set shiftwidth=4 tabstop=8 expandtab:
* :indentSize=4:tabSize=8:noTabs=true:
*/
|
