/* packet-nflog.c * Copyright 2011,2012 Jakub Zawadzki * * Wireshark - Network traffic analyzer * By Gerald Combs * Copyright 1998 * * SPDX-License-Identifier: GPL-2.0-or-later */ #include "config.h" #include #include #include #include #include "packet-netlink.h" void proto_register_nflog(void); void proto_reg_handoff_nflog(void); /* nfulnl_attr_type enum from */ 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: */