375 lines
14 KiB
C
375 lines
14 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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* 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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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#define NEW_PROTO_TREE_API
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#include "config.h"
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#include <epan/etypes.h>
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#include <epan/packet.h>
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#include <wiretap/wtap.h>
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#include <wsutil/ws_roundup.h>
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#include "packet-netlink.h"
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void proto_register_nflog(void);
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void proto_reg_handoff_nflog(void);
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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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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 ett_nflog = -1;
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static int ett_nflog_tlv = -1;
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static header_field_info *hfi_nflog = NULL;
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#define NFLOG_HFI_INIT HFI_INIT(proto_nflog)
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/* Header */
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static header_field_info hfi_nflog_family NFLOG_HFI_INIT =
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{ "Family", "nflog.family", FT_UINT8, BASE_DEC, VALS(nfproto_family_vals), 0x00, NULL, HFILL };
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static header_field_info hfi_nflog_version NFLOG_HFI_INIT =
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{ "Version", "nflog.version", FT_UINT8, BASE_DEC, NULL, 0x00, NULL, HFILL };
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static header_field_info hfi_nflog_resid NFLOG_HFI_INIT =
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{ "Resource id", "nflog.res_id", FT_UINT16, BASE_DEC, NULL, 0x00, NULL, HFILL };
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/* TLV */
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static header_field_info hfi_nflog_tlv NFLOG_HFI_INIT =
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{ "TLV", "nflog.tlv", FT_BYTES, BASE_NONE, NULL, 0x00, NULL, HFILL };
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static header_field_info hfi_nflog_tlv_length NFLOG_HFI_INIT =
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{ "Length", "nflog.tlv_length", FT_UINT16, BASE_DEC, NULL, 0x00, "TLV Length", HFILL };
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static header_field_info hfi_nflog_tlv_type NFLOG_HFI_INIT =
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{ "Type", "nflog.tlv_type", FT_UINT16, BASE_DEC, VALS(nflog_tlv_vals), 0x7fff, "TLV Type", HFILL };
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/* TLV values */
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static header_field_info hfi_nflog_tlv_hwprotocol NFLOG_HFI_INIT =
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{ "HW protocol", "nflog.protocol", FT_UINT16, BASE_HEX, VALS(etype_vals), 0x00, NULL, HFILL };
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static header_field_info hfi_nflog_tlv_hook NFLOG_HFI_INIT =
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{ "Netfilter hook", "nflog.hook", FT_UINT8, BASE_DEC, VALS(netfilter_hooks_vals), 0x00, NULL, HFILL };
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static header_field_info hfi_nflog_tlv_ifindex_indev NFLOG_HFI_INIT =
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{ "IFINDEX_INDEV", "nflog.ifindex_indev", FT_UINT32, BASE_DEC, NULL, 0x00, NULL, HFILL };
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static header_field_info hfi_nflog_tlv_ifindex_outdev NFLOG_HFI_INIT =
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{ "IFINDEX_OUTDEV", "nflog.ifindex_outdev", FT_UINT32, BASE_DEC, NULL, 0x00, NULL, HFILL };
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static header_field_info hfi_nflog_tlv_ifindex_physindev NFLOG_HFI_INIT =
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{ "IFINDEX_PHYSINDEV", "nflog.ifindex_physindev", FT_UINT32, BASE_DEC, NULL, 0x00, NULL, HFILL };
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static header_field_info hfi_nflog_tlv_ifindex_physoutdev NFLOG_HFI_INIT =
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{ "IFINDEX_PHYSOUTDEV", "nflog.ifindex_physoutdev", FT_UINT32, BASE_DEC, NULL, 0x00, NULL, HFILL };
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static header_field_info hfi_nflog_tlv_prefix NFLOG_HFI_INIT =
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{ "Prefix", "nflog.prefix", FT_STRINGZ, BASE_NONE, NULL, 0x00, "TLV Prefix Value", HFILL };
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static header_field_info hfi_nflog_tlv_uid NFLOG_HFI_INIT =
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{ "UID", "nflog.uid", FT_INT32, BASE_DEC, NULL, 0x00, "TLV UID Value", HFILL };
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static header_field_info hfi_nflog_tlv_gid NFLOG_HFI_INIT =
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{ "GID", "nflog.gid", FT_INT32, BASE_DEC, NULL, 0x00, "TLV GID Value", HFILL };
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static header_field_info hfi_nflog_tlv_timestamp NFLOG_HFI_INIT =
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{ "Timestamp", "nflog.timestamp", FT_ABSOLUTE_TIME, ABSOLUTE_TIME_LOCAL, NULL, 0x00, "TLV Timestamp Value", HFILL };
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static header_field_info hfi_nflog_tlv_unknown NFLOG_HFI_INIT =
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{ "Value", "nflog.tlv_value", FT_BYTES, BASE_NONE, NULL, 0x00, "TLV Value", HFILL };
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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_table_t ethertype_table;
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static dissector_handle_t nflog_handle;
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static int
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dissect_nflog(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
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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 pf;
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guint16 hw_protocol = 0;
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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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pf = tvb_get_guint8(tvb, 0);
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/* Header */
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if (proto_field_is_referenced(tree, hfi_nflog->id)) {
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ti = proto_tree_add_item(tree, hfi_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, &hfi_nflog_family, tvb, offset, 1, ENC_NA);
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offset += 1;
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proto_tree_add_item(nflog_tree, &hfi_nflog_version, tvb, offset, 1, ENC_NA);
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offset += 1;
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proto_tree_add_item(nflog_tree, &hfi_nflog_resid, tvb, offset, 2, ENC_BIG_ENDIAN);
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/*offset += 2;*/
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}
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offset = start_tlv_offset;
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/* TLVs */
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while (tvb_reported_length_remaining(tvb, offset) >= 4) {
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guint16 tlv_len = tvb_get_h_guint16(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 offset;
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value_len = tlv_len - 4;
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tlv_type = (tvb_get_h_guint16(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, &hfi_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, &hfi_nflog_tlv_length, tvb, offset + 0, 2, ENC_HOST_ENDIAN);
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proto_tree_add_item(tlv_tree, &hfi_nflog_tlv_type, tvb, offset + 2, 2, ENC_HOST_ENDIAN);
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switch (tlv_type) {
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case WS_NFULA_PACKET_HDR:
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if (value_len == 4) {
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proto_tree_add_item(tlv_tree, &hfi_nflog_tlv_hwprotocol,
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tvb, offset + 4, 2, ENC_BIG_ENDIAN);
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proto_tree_add_item(tlv_tree, &hfi_nflog_tlv_hook,
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tvb, offset + 6, 1, ENC_NA);
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handled = TRUE;
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}
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break;
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case WS_NFULA_IFINDEX_INDEV:
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if (value_len == 4) {
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proto_tree_add_item(tlv_tree, &hfi_nflog_tlv_ifindex_indev, 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_IFINDEX_OUTDEV:
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if (value_len == 4) {
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proto_tree_add_item(tlv_tree, &hfi_nflog_tlv_ifindex_outdev, 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_IFINDEX_PHYSINDEV:
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if (value_len == 4) {
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proto_tree_add_item(tlv_tree, &hfi_nflog_tlv_ifindex_physindev, 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_IFINDEX_PHYSOUTDEV:
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if (value_len == 4) {
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proto_tree_add_item(tlv_tree, &hfi_nflog_tlv_ifindex_physoutdev, 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_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, &hfi_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, &hfi_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, &hfi_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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/* XXX - add an "expert info" warning if the nanoseconds are >= 10^9? */
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proto_tree_add_item(tlv_tree, &hfi_nflog_tlv_timestamp,
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tvb, offset + 4, value_len, ENC_TIME_SECS_NSECS|ENC_BIG_ENDIAN);
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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, &hfi_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_PACKET_HDR && value_len == 4)
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hw_protocol = tvb_get_ntohs(tvb, offset + 4);
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if (tlv_type == WS_NFULA_PAYLOAD)
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next_tvb = tvb_new_subset_length(tvb, offset + 4, value_len);
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offset += WS_ROUNDUP_4(tlv_len); /* next TLV aligned to 4B */
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}
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if (next_tvb && hw_protocol) {
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if (!dissector_try_uint(ethertype_table, hw_protocol, next_tvb, pinfo, tree))
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call_data_dissector(next_tvb, pinfo, tree);
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} else if (next_tvb) {
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switch (pf) {
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/* Note: NFPROTO_INET is not supposed to appear here, it is mapped
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* to NFPROTO_IPV4 or NFPROTO_IPV6 */
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case WS_NFPROTO_IPV4:
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call_dissector(ip_handle, next_tvb, pinfo, tree);
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break;
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case WS_NFPROTO_IPV6:
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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_data_dissector(next_tvb, pinfo, tree);
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break;
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}
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}
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return tvb_captured_length(tvb);
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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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#ifndef HAVE_HFI_SECTION_INIT
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static header_field_info *hfi[] = {
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/* Header */
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&hfi_nflog_family,
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&hfi_nflog_version,
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&hfi_nflog_resid,
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/* TLV */
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&hfi_nflog_tlv,
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&hfi_nflog_tlv_length,
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&hfi_nflog_tlv_type,
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/* TLV values */
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&hfi_nflog_tlv_hwprotocol,
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&hfi_nflog_tlv_hook,
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&hfi_nflog_tlv_ifindex_indev,
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&hfi_nflog_tlv_ifindex_outdev,
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&hfi_nflog_tlv_ifindex_physindev,
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&hfi_nflog_tlv_ifindex_physoutdev,
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&hfi_nflog_tlv_prefix,
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&hfi_nflog_tlv_uid,
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&hfi_nflog_tlv_gid,
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&hfi_nflog_tlv_timestamp,
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&hfi_nflog_tlv_unknown,
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};
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#endif
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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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int proto_nflog;
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proto_nflog = proto_register_protocol("Linux Netfilter NFLOG", "NFLOG", "nflog");
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hfi_nflog = proto_registrar_get_nth(proto_nflog);
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nflog_handle = register_dissector("nflog", dissect_nflog, proto_nflog);
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proto_register_fields(proto_nflog, hfi, array_length(hfi));
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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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ip_handle = find_dissector_add_dependency("ip", hfi_nflog->id);
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ip6_handle = find_dissector_add_dependency("ipv6", hfi_nflog->id);
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dissector_add_uint("wtap_encap", WTAP_ENCAP_NFLOG, nflog_handle);
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ethertype_table = find_dissector_table("ethertype");
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}
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/*
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* Editor modelines
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*
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* Local Variables:
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* c-basic-offset: 4
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* tab-width: 8
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* indent-tabs-mode: nil
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* End:
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*
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* ex: set shiftwidth=4 tabstop=8 expandtab:
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* :indentSize=4:tabSize=8:noTabs=true:
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*/
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