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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
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "config.h"
#include <epan/etypes.h>
#include <epan/packet.h>
#include <wiretap/wtap.h>
#include <wsutil/ws_roundup.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 proto_nflog = -1;
static int hf_nflog_family = -1;
static int hf_nflog_resid = -1;
static int hf_nflog_tlv = -1;
static int hf_nflog_tlv_gid = -1;
static int hf_nflog_tlv_hook = -1;
static int hf_nflog_tlv_hwprotocol = -1;
static int hf_nflog_tlv_ifindex_indev = -1;
static int hf_nflog_tlv_ifindex_outdev = -1;
static int hf_nflog_tlv_ifindex_physindev = -1;
static int hf_nflog_tlv_ifindex_physoutdev = -1;
static int hf_nflog_tlv_length = -1;
static int hf_nflog_tlv_prefix = -1;
static int hf_nflog_tlv_timestamp = -1;
static int hf_nflog_tlv_type = -1;
static int hf_nflog_tlv_uid = -1;
static int hf_nflog_tlv_unknown = -1;
static int hf_nflog_version = -1;
static int ett_nflog = -1;
static int ett_nflog_tlv = -1;
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, proto_nflog)) {
ti = proto_tree_add_item(tree, proto_nflog, tvb, 0, -1, ENC_NA);
nflog_tree = proto_item_add_subtree(ti, ett_nflog);
proto_tree_add_item(nflog_tree, hf_nflog_family, tvb, offset, 1, ENC_NA);
offset += 1;
proto_tree_add_item(nflog_tree, hf_nflog_version, tvb, offset, 1, ENC_NA);
offset += 1;
proto_tree_add_item(nflog_tree, hf_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, hf_nflog_tlv,
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, hf_nflog_tlv_length, tvb, offset + 0, 2, ENC_HOST_ENDIAN);
proto_tree_add_item(tlv_tree, hf_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, hf_nflog_tlv_hwprotocol,
tvb, offset + 4, 2, ENC_BIG_ENDIAN);
proto_tree_add_item(tlv_tree, hf_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, hf_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, hf_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, hf_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, hf_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, hf_nflog_tlv_prefix,
tvb, offset + 4, value_len, ENC_ASCII);
handled = TRUE;
}
break;
case WS_NFULA_UID:
if (value_len == 4) {
proto_tree_add_item(tlv_tree, hf_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, hf_nflog_tlv_gid,
tvb, offset + 4, value_len, ENC_BIG_ENDIAN);
handled = TRUE;
}
break;
case WS_NFULA_TIMESTAMP:
if (value_len == 16) {
/*
* 64-bit seconds and 64-bit microseconds.
*
* XXX - add an "expert info" warning if the
* microseconds are >= 10^6?
*/
proto_tree_add_item(tlv_tree, hf_nflog_tlv_timestamp,
tvb, offset + 4, value_len,
ENC_TIME_SECS_USECS|ENC_BIG_ENDIAN);
handled = TRUE;
}
break;
}
if (!handled)
proto_tree_add_item(tlv_tree, hf_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 += WS_ROUNDUP_4(tlv_len); /* 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)
{
static hf_register_info hf[] = {
{ &hf_nflog_family,
{ "Family", "nflog.family",
FT_UINT8, BASE_DEC, VALS(nfproto_family_vals), 0x00,
NULL, HFILL }
},
{ &hf_nflog_version,
{ "Version", "nflog.version",
FT_UINT8, BASE_DEC, NULL, 0x00,
NULL, HFILL }
},
{ &hf_nflog_resid,
{ "Resource id", "nflog.res_id",
FT_UINT16, BASE_DEC, NULL, 0x00,
NULL, HFILL }
},
{ &hf_nflog_tlv,
{ "TLV", "nflog.tlv",
FT_BYTES, BASE_NONE, NULL, 0x00,
NULL, HFILL }
},
{ &hf_nflog_tlv_length,
{ "Length", "nflog.tlv_length",
FT_UINT16, BASE_DEC, NULL, 0x00,
"TLV Length", HFILL }
},
{ &hf_nflog_tlv_type,
{ "Type", "nflog.tlv_type",
FT_UINT16, BASE_DEC, VALS(nflog_tlv_vals), 0x7fff,
"TLV Type", HFILL }
},
{ &hf_nflog_tlv_hwprotocol,
{ "HW protocol", "nflog.protocol",
FT_UINT16, BASE_HEX, VALS(etype_vals), 0x00,
NULL, HFILL }
},
{ &hf_nflog_tlv_hook,
{ "Netfilter hook", "nflog.hook",
FT_UINT8, BASE_DEC, VALS(netfilter_hooks_vals), 0x00,
NULL, HFILL }
},
{ &hf_nflog_tlv_ifindex_indev,
{ "IFINDEX_INDEV", "nflog.ifindex_indev",
FT_UINT32, BASE_DEC, NULL, 0x00,
NULL, HFILL }
},
{ &hf_nflog_tlv_ifindex_outdev,
{ "IFINDEX_OUTDEV", "nflog.ifindex_outdev",
FT_UINT32, BASE_DEC, NULL, 0x00,
NULL, HFILL }
},
{ &hf_nflog_tlv_ifindex_physindev,
{ "IFINDEX_PHYSINDEV", "nflog.ifindex_physindev",
FT_UINT32, BASE_DEC, NULL, 0x00,
NULL, HFILL }
},
{ &hf_nflog_tlv_ifindex_physoutdev,
{ "IFINDEX_PHYSOUTDEV", "nflog.ifindex_physoutdev",
FT_UINT32, BASE_DEC, NULL, 0x00,
NULL, HFILL }
},
{ &hf_nflog_tlv_prefix,
{ "Prefix", "nflog.prefix",
FT_STRINGZ, BASE_NONE, NULL, 0x00,
"TLV Prefix Value", HFILL }
},
{ &hf_nflog_tlv_uid,
{ "UID", "nflog.uid",
FT_INT32, BASE_DEC, NULL, 0x00,
"TLV UID Value", HFILL }
},
{ &hf_nflog_tlv_gid,
{ "GID", "nflog.gid",
FT_INT32, BASE_DEC, NULL, 0x00,
"TLV GID Value", HFILL }
},
{ &hf_nflog_tlv_timestamp,
{ "Timestamp", "nflog.timestamp",
FT_ABSOLUTE_TIME, ABSOLUTE_TIME_LOCAL, NULL, 0x00,
"TLV Timestamp Value", HFILL }
},
{ &hf_nflog_tlv_unknown,
{ "Value", "nflog.tlv_value",
FT_BYTES, BASE_NONE, NULL, 0x00,
"TLV Value", HFILL }
},
};
static gint *ett[] = {
&ett_nflog,
&ett_nflog_tlv
};
proto_nflog = proto_register_protocol("Linux Netfilter NFLOG", "NFLOG", "nflog");
nflog_handle = register_dissector("nflog", dissect_nflog, proto_nflog);
proto_register_field_array(proto_nflog, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
}
void
proto_reg_handoff_nflog(void)
{
ip_handle = find_dissector_add_dependency("ip", proto_nflog);
ip6_handle = find_dissector_add_dependency("ipv6", proto_nflog);
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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