405 lines
11 KiB
C
405 lines
11 KiB
C
/* packet-nflog.c
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* Copyright 2011,2012 Jakub Zawadzki <darkjames-ws@darkjames.pl>
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*
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* $Id$
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include <glib.h>
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#include <epan/packet.h>
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#include <epan/prefs.h>
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#include <epan/aftypes.h>
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/* nfulnl_attr_type enum from <linux/netfilter/nfnetlink_log.h> */
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enum ws_nfulnl_attr_type {
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WS_NFULA_UNSPEC,
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WS_NFULA_PACKET_HDR,
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WS_NFULA_MARK, /* __u32 nfmark */
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WS_NFULA_TIMESTAMP, /* nfulnl_msg_packet_timestamp */
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WS_NFULA_IFINDEX_INDEV, /* __u32 ifindex */
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WS_NFULA_IFINDEX_OUTDEV, /* __u32 ifindex */
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WS_NFULA_IFINDEX_PHYSINDEV, /* __u32 ifindex */
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WS_NFULA_IFINDEX_PHYSOUTDEV, /* __u32 ifindex */
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WS_NFULA_HWADDR, /* nfulnl_msg_packet_hw */
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WS_NFULA_PAYLOAD, /* opaque data payload */
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WS_NFULA_PREFIX, /* string prefix */
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WS_NFULA_UID, /* user id of socket */
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WS_NFULA_SEQ, /* instance-local sequence number */
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WS_NFULA_SEQ_GLOBAL, /* global sequence number */
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WS_NFULA_GID, /* group id of socket */
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WS_NFULA_HWTYPE, /* hardware type */
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WS_NFULA_HWHEADER, /* hardware header */
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WS_NFULA_HWLEN /* hardware header length */
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};
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#define BYTE_ORDER_AUTO 0
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#define BYTE_ORDER_BE 1
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#define BYTE_ORDER_LE 2
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#define BYTE_ORDER_HOST 3
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static const enum_val_t byte_order_types[] = {
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{ "Auto", "Auto", BYTE_ORDER_AUTO },
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{ "Host", "Host", BYTE_ORDER_HOST },
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{ "LE", "Little Endian", BYTE_ORDER_LE },
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{ "BE", "Big Endian", BYTE_ORDER_BE },
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{ NULL, NULL, 0 }
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};
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static gint nflog_byte_order = BYTE_ORDER_AUTO;
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static int proto_nflog = -1;
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static int ett_nflog = -1;
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static int ett_nflog_tlv = -1;
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static int hf_nflog_family = -1;
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static int hf_nflog_version = -1;
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static int hf_nflog_resid = -1;
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static int hf_nflog_encoding = -1;
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static int hf_nflog_tlv = -1;
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static int hf_nflog_tlv_length = -1;
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static int hf_nflog_tlv_type = -1;
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static int hf_nflog_tlv_prefix = -1;
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static int hf_nflog_tlv_uid = -1;
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static int hf_nflog_tlv_gid = -1;
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static int hf_nflog_tlv_timestamp = -1;
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static int hf_nflog_tlv_unknown = -1;
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static dissector_handle_t ip_handle;
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static dissector_handle_t ip6_handle;
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static dissector_handle_t data_handle;
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static const value_string _linux_family_vals[] = {
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{ LINUX_AF_INET, "IP" },
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{ LINUX_AF_INET6, "IPv6" },
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{ 0, NULL }
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};
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static const value_string _encoding_vals[] = {
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{ ENC_BIG_ENDIAN, "Big Endian" },
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{ ENC_LITTLE_ENDIAN, "Little Endian" },
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/* { ENC_NA, "Unknown" }, */ /* ENC_NA has the same value as ENC_BIG_ENDIAN */
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{ 0, NULL }
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};
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static const value_string nflog_tlv_vals[] = {
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{ WS_NFULA_UNSPEC, "NFULA_UNSPEC" },
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{ WS_NFULA_PACKET_HDR, "NFULA_PACKET_HDR" },
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{ WS_NFULA_MARK, "NFULA_MARK" },
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{ WS_NFULA_TIMESTAMP, "NFULA_TIMESTAMP" },
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{ WS_NFULA_IFINDEX_INDEV, "NFULA_IFINDEX_INDEV" },
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{ WS_NFULA_IFINDEX_OUTDEV, "NFULA_IFINDEX_OUTDEV" },
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{ WS_NFULA_IFINDEX_PHYSINDEV, "NFULA_IFINDEX_PHYSINDEV" },
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{ WS_NFULA_IFINDEX_PHYSOUTDEV, "NFULA_IFINDEX_PHYSOUTDEV" },
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{ WS_NFULA_HWADDR, "NFULA_HWADDR" },
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{ WS_NFULA_PAYLOAD, "NFULA_PAYLOAD" },
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{ WS_NFULA_PREFIX, "NFULA_PREFIX" },
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{ WS_NFULA_UID, "NFULA_UID" },
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{ WS_NFULA_SEQ, "NFULA_SEQ" },
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{ WS_NFULA_SEQ_GLOBAL, "NFULA_SEQ_GLOBAL" },
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{ WS_NFULA_GID, "NFULA_GID" },
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{ WS_NFULA_HWTYPE, "NFULA_HWTYPE" },
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{ WS_NFULA_HWHEADER, "NFULA_HWHEADER" },
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{ WS_NFULA_HWLEN, "NFULA_HWLEN" },
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{ 0, NULL }
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};
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static int
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nflog_tvb_test_order(tvbuff_t *tvb, int offset, guint16 (*val16_get)(tvbuff_t *, int))
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{
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while (tvb_length_remaining(tvb, offset) > 4) {
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guint16 tlv_len = val16_get(tvb, offset + 0);
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guint16 tlv_type;
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/* malformed */
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if (tlv_len < 4)
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return 0;
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tlv_type = (val16_get(tvb, offset + 2) & 0x7fff);
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if (tlv_type >= 0x100)
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break;
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if (tlv_type)
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return 1;
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offset += ((tlv_len + 3) & ~3); /* next TLV aligned to 4B */
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}
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return 0;
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}
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static int
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nflog_tvb_byte_order(tvbuff_t *tvb, int tlv_offset)
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{
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switch (nflog_byte_order) {
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case BYTE_ORDER_BE:
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return ENC_BIG_ENDIAN;
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case BYTE_ORDER_LE:
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return ENC_LITTLE_ENDIAN;
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case BYTE_ORDER_HOST:
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return (G_BYTE_ORDER == G_LITTLE_ENDIAN) ?
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ENC_LITTLE_ENDIAN :
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ENC_BIG_ENDIAN;
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}
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if (nflog_tvb_test_order(tvb, tlv_offset, tvb_get_ntohs))
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return ENC_BIG_ENDIAN;
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if (nflog_tvb_test_order(tvb, tlv_offset, tvb_get_letohs))
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return ENC_LITTLE_ENDIAN;
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return ENC_NA; /* ENC_NA same as ENC_BIG_ENDIAN */
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}
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static void
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dissect_nflog(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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const int start_tlv_offset = 4;
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proto_tree *nflog_tree = NULL;
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proto_item *ti;
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int offset = 0;
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tvbuff_t *next_tvb = NULL;
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int aftype;
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int enc;
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guint16 (*val16_get)(tvbuff_t *, int);
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "NFLOG");
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col_clear(pinfo->cinfo, COL_INFO);
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aftype = tvb_get_guint8(tvb, 0);
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enc = nflog_tvb_byte_order(tvb, start_tlv_offset);
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switch (enc) {
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case ENC_LITTLE_ENDIAN:
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val16_get = tvb_get_letohs;
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break;
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case ENC_BIG_ENDIAN:
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default:
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val16_get = tvb_get_ntohs;
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break;
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}
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/* Header */
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if (proto_field_is_referenced(tree, proto_nflog)) {
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ti = proto_tree_add_item(tree, proto_nflog, tvb, 0, -1, ENC_NA);
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nflog_tree = proto_item_add_subtree(ti, ett_nflog);
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proto_tree_add_item(nflog_tree, hf_nflog_family, tvb, offset, 1, ENC_NA);
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offset += 1;
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proto_tree_add_item(nflog_tree, hf_nflog_version, tvb, offset, 1, ENC_NA);
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offset += 1;
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proto_tree_add_item(nflog_tree, hf_nflog_resid, tvb, offset, 2, ENC_BIG_ENDIAN);
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offset += 2;
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ti = proto_tree_add_uint(nflog_tree, hf_nflog_encoding,
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tvb, offset, tvb_length_remaining(tvb, offset), enc);
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PROTO_ITEM_SET_GENERATED(ti);
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}
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offset = start_tlv_offset;
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/* TLVs */
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while (tvb_length_remaining(tvb, offset) >= 4) {
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guint16 tlv_len = val16_get(tvb, offset + 0);
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guint16 tlv_type;
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guint16 value_len;
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proto_tree *tlv_tree;
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/* malformed */
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if (tlv_len < 4)
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return;
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value_len = tlv_len - 4;
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tlv_type = (val16_get(tvb, offset + 2) & 0x7fff);
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if (nflog_tree) {
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gboolean handled = FALSE;
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ti = proto_tree_add_bytes_format(nflog_tree, hf_nflog_tlv,
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tvb, offset, tlv_len, NULL,
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"TLV Type: %s (%u), Length: %u",
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val_to_str_const(tlv_type, nflog_tlv_vals, "Unknown"),
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tlv_type, tlv_len);
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tlv_tree = proto_item_add_subtree(ti, ett_nflog_tlv);
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proto_tree_add_item(tlv_tree, hf_nflog_tlv_length, tvb, offset + 0, 2, enc);
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proto_tree_add_item(tlv_tree, hf_nflog_tlv_type, tvb, offset + 2, 2, enc);
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switch (tlv_type) {
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case WS_NFULA_PAYLOAD:
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handled = TRUE;
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break;
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case WS_NFULA_PREFIX:
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if (value_len >= 1) {
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proto_tree_add_item(tlv_tree, hf_nflog_tlv_prefix,
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tvb, offset + 4, value_len, ENC_NA);
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handled = TRUE;
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}
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break;
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case WS_NFULA_UID:
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if (value_len == 4) {
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proto_tree_add_item(tlv_tree, hf_nflog_tlv_uid,
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tvb, offset + 4, value_len, ENC_BIG_ENDIAN);
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handled = TRUE;
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}
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break;
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case WS_NFULA_GID:
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if (value_len == 4) {
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proto_tree_add_item(tlv_tree, hf_nflog_tlv_gid,
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tvb, offset + 4, value_len, ENC_BIG_ENDIAN);
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handled = TRUE;
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}
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break;
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case WS_NFULA_TIMESTAMP:
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if (value_len == 16) {
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nstime_t ts;
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ts.secs = (time_t)tvb_get_ntoh64(tvb, offset + 4);
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/* XXX - add an "expert info" warning if this is >= 10^9? */
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ts.nsecs = (int)tvb_get_ntoh64(tvb, offset + 12);
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proto_tree_add_time(tlv_tree, hf_nflog_tlv_timestamp,
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tvb, offset + 4, value_len, &ts);
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handled = TRUE;
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}
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break;
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}
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if (!handled)
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proto_tree_add_item(tlv_tree, hf_nflog_tlv_unknown,
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tvb, offset + 4, value_len, ENC_NA);
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}
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if (tlv_type == WS_NFULA_PAYLOAD)
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next_tvb = tvb_new_subset(tvb, offset + 4, value_len, value_len);
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offset += ((tlv_len + 3) & ~3); /* next TLV aligned to 4B */
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}
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if (next_tvb) {
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switch (aftype) {
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case LINUX_AF_INET:
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call_dissector(ip_handle, next_tvb, pinfo, tree);
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break;
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case LINUX_AF_INET6:
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call_dissector(ip6_handle, next_tvb, pinfo, tree);
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break;
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default:
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call_dissector(data_handle, next_tvb, pinfo, tree);
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break;
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}
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}
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}
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void
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proto_register_nflog(void)
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{
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static hf_register_info hf[] = {
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/* Header */
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{ &hf_nflog_family,
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{ "Family", "nflog.family", FT_UINT8, BASE_DEC, VALS(_linux_family_vals), 0x00, NULL, HFILL }
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},
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{ &hf_nflog_version,
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{ "Version", "nflog.version", FT_UINT8, BASE_DEC, NULL, 0x00, NULL, HFILL }
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},
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{ &hf_nflog_resid,
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{ "Resource id", "nflog.res_id", FT_UINT16, BASE_DEC, NULL, 0x00, NULL, HFILL }
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},
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{ &hf_nflog_encoding,
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{ "Encoding", "nflog.encoding", FT_UINT32, BASE_HEX, VALS(_encoding_vals), 0x00, NULL, HFILL }
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},
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/* TLV */
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{ &hf_nflog_tlv,
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{ "TLV", "nflog.tlv", FT_BYTES, BASE_NONE, NULL, 0x00, NULL, HFILL }
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},
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{ &hf_nflog_tlv_length,
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{ "Length", "nflog.tlv_length", FT_UINT16, BASE_DEC, NULL, 0x00, "TLV Length", HFILL }
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},
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{ &hf_nflog_tlv_type,
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{ "Type", "nflog.tlv_type", FT_UINT16, BASE_DEC, VALS(nflog_tlv_vals), 0x7fff, "TLV Type", HFILL }
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},
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/* TLV values */
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{ &hf_nflog_tlv_prefix,
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{ "Prefix", "nflog.prefix", FT_STRINGZ, BASE_NONE, NULL, 0x00, "TLV Prefix Value", HFILL }
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},
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{ &hf_nflog_tlv_uid,
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{ "UID", "nflog.uid", FT_INT32, BASE_DEC, NULL, 0x00, "TLV UID Value", HFILL }
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},
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{ &hf_nflog_tlv_gid,
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{ "GID", "nflog.gid", FT_INT32, BASE_DEC, NULL, 0x00, "TLV GID Value", HFILL }
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},
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{ &hf_nflog_tlv_timestamp,
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{ "Timestamp", "nflog.timestamp", FT_ABSOLUTE_TIME, ABSOLUTE_TIME_LOCAL, NULL, 0x00, "TLV Timestamp Value", HFILL }
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},
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{ &hf_nflog_tlv_unknown,
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{ "Value", "nflog.tlv_value", FT_BYTES, BASE_NONE, NULL, 0x00, "TLV Value", HFILL }
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},
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};
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static gint *ett[] = {
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&ett_nflog,
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&ett_nflog_tlv
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};
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module_t *pref;
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proto_nflog = proto_register_protocol("Linux Netfilter NFLOG", "NFLOG", "nflog");
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pref = prefs_register_protocol(proto_nflog, NULL);
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prefs_register_enum_preference(pref, "byte_order_type", "Byte Order", "Byte Order",
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&nflog_byte_order, byte_order_types, FALSE);
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register_dissector("nflog", dissect_nflog, proto_nflog);
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proto_register_field_array(proto_nflog, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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}
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void
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proto_reg_handoff_nflog(void)
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{
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dissector_handle_t nflog_handle;
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ip_handle = find_dissector("ip");
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ip6_handle = find_dissector("ipv6");
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data_handle = find_dissector("data");
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nflog_handle = find_dissector("nflog");
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dissector_add_uint("wtap_encap", WTAP_ENCAP_NFLOG, nflog_handle);
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}
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