394 lines
14 KiB
C
394 lines
14 KiB
C
/* 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) {
|
|
/* XXX - add an "expert info" warning if the nanoseconds are >= 10^9? */
|
|
proto_tree_add_item(tlv_tree, hf_nflog_tlv_timestamp,
|
|
tvb, offset + 4, value_len, ENC_TIME_SECS_NSECS|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:
|
|
*/
|