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wireshark/epan/dissectors/packet-nflog.c
Michael Mann f4b0abc729 Dissectors don't need a journey of self discovery. 
They already know who they are when they register themselves.  Saving the
handle then to avoid finding it later.
Not sure if this will increase unnecessary register_dissector functions
(instead of using create_dissector_handle in proto_reg_handoff function)
when other dissectors copy/paste, but it should make startup time
a few microseconds better.

Change-Id: I3839be791b32b84887ac51a6a65fb5733e9f1f43
Reviewed-on: https://code.wireshark.org/review/19481
Petri-Dish: Michael Mann <mmann78@netscape.net>
Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org>
Reviewed-by: Anders Broman <a.broman58@gmail.com>
2016-12-31 07:31:42 +00:00

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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/etypes.h>
#include <epan/packet.h>
#include <wiretap/wtap.h>
#include "packet-netlink.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, VALS(nfproto_family_vals), 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_hwprotocol NFLOG_HFI_INIT =
{ "HW protocol", "nflog.protocol", FT_UINT16, BASE_HEX, VALS(etype_vals), 0x00, NULL, HFILL };
static header_field_info hfi_nflog_tlv_hook NFLOG_HFI_INIT =
{ "Netfilter hook", "nflog.hook", FT_UINT8, BASE_DEC, VALS(netfilter_hooks_vals), 0x00, NULL, HFILL };
static header_field_info hfi_nflog_tlv_ifindex_indev NFLOG_HFI_INIT =
{ "IFINDEX_INDEV", "nflog.ifindex_indev", FT_UINT32, BASE_DEC, NULL, 0x00, NULL, HFILL };
static header_field_info hfi_nflog_tlv_ifindex_outdev NFLOG_HFI_INIT =
{ "IFINDEX_OUTDEV", "nflog.ifindex_outdev", FT_UINT32, BASE_DEC, NULL, 0x00, NULL, HFILL };
static header_field_info hfi_nflog_tlv_ifindex_physindev NFLOG_HFI_INIT =
{ "IFINDEX_PHYSINDEV", "nflog.ifindex_physindev", FT_UINT32, BASE_DEC, NULL, 0x00, NULL, HFILL };
static header_field_info hfi_nflog_tlv_ifindex_physoutdev NFLOG_HFI_INIT =
{ "IFINDEX_PHYSOUTDEV", "nflog.ifindex_physoutdev", FT_UINT32, BASE_DEC, NULL, 0x00, NULL, HFILL };
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_table_t ethertype_table;
static dissector_handle_t nflog_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 pf;
guint16 hw_protocol = 0;
col_set_str(pinfo->cinfo, COL_PROTOCOL, "NFLOG");
col_clear(pinfo->cinfo, COL_INFO);
pf = 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_PACKET_HDR:
if (value_len == 4) {
proto_tree_add_item(tlv_tree, &hfi_nflog_tlv_hwprotocol,
tvb, offset + 4, 2, ENC_BIG_ENDIAN);
proto_tree_add_item(tlv_tree, &hfi_nflog_tlv_hook,
tvb, offset + 6, 1, ENC_NA);
handled = TRUE;
}
break;
case WS_NFULA_IFINDEX_INDEV:
if (value_len == 4) {
proto_tree_add_item(tlv_tree, &hfi_nflog_tlv_ifindex_indev, tvb, offset + 4, value_len, ENC_BIG_ENDIAN);
handled = TRUE;
}
break;
case WS_NFULA_IFINDEX_OUTDEV:
if (value_len == 4) {
proto_tree_add_item(tlv_tree, &hfi_nflog_tlv_ifindex_outdev, tvb, offset + 4, value_len, ENC_BIG_ENDIAN);
handled = TRUE;
}
break;
case WS_NFULA_IFINDEX_PHYSINDEV:
if (value_len == 4) {
proto_tree_add_item(tlv_tree, &hfi_nflog_tlv_ifindex_physindev, tvb, offset + 4, value_len, ENC_BIG_ENDIAN);
handled = TRUE;
}
break;
case WS_NFULA_IFINDEX_PHYSOUTDEV:
if (value_len == 4) {
proto_tree_add_item(tlv_tree, &hfi_nflog_tlv_ifindex_physoutdev, tvb, offset + 4, value_len, ENC_BIG_ENDIAN);
handled = TRUE;
}
break;
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_PACKET_HDR && value_len == 4)
hw_protocol = tvb_get_ntohs(tvb, offset + 4);
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 && hw_protocol) {
if (!dissector_try_uint(ethertype_table, hw_protocol, next_tvb, pinfo, tree))
call_data_dissector(next_tvb, pinfo, tree);
} else if (next_tvb) {
switch (pf) {
/* Note: NFPROTO_INET is not supposed to appear here, it is mapped
* to NFPROTO_IPV4 or NFPROTO_IPV6 */
case WS_NFPROTO_IPV4:
call_dissector(ip_handle, next_tvb, pinfo, tree);
break;
case WS_NFPROTO_IPV6:
call_dissector(ip6_handle, next_tvb, pinfo, tree);
break;
default:
call_data_dissector(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_hwprotocol,
&hfi_nflog_tlv_hook,
&hfi_nflog_tlv_ifindex_indev,
&hfi_nflog_tlv_ifindex_outdev,
&hfi_nflog_tlv_ifindex_physindev,
&hfi_nflog_tlv_ifindex_physoutdev,
&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);
nflog_handle = 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)
{
ip_handle = find_dissector_add_dependency("ip", hfi_nflog->id);
ip6_handle = find_dissector_add_dependency("ipv6", hfi_nflog->id);
dissector_add_uint("wtap_encap", WTAP_ENCAP_NFLOG, nflog_handle);
ethertype_table = find_dissector_table("ethertype");
}
/*
* 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:
*/
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