2013-12-08 12:01:32 +00:00
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/* packet-netlink.c
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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 Gerald Combs
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*
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2018-02-12 11:23:27 +00:00
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* SPDX-License-Identifier: GPL-2.0-or-later
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2013-12-08 12:01:32 +00:00
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*/
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/* http://www.tcpdump.org/linktypes/LINKTYPE_NETLINK.html */
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#define NEW_PROTO_TREE_API
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#include "config.h"
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#include <epan/packet.h>
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2014-12-20 21:23:59 +00:00
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#include <epan/arptypes.h>
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2013-12-08 12:01:32 +00:00
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#include <wiretap/wtap.h>
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#include "packet-netlink.h"
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2013-12-13 22:34:10 +00:00
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void proto_register_netlink(void);
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void proto_reg_handoff_netlink(void);
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2013-12-08 12:01:32 +00:00
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/*
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* A DLT_LINUX_SLL fake link-layer header.
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*/
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#define SLL_HEADER_SIZE 16 /* total header length */
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2013-12-13 00:51:30 +00:00
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static const value_string netlink_family_vals[] = {
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2016-08-06 14:42:19 +00:00
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{ WS_NETLINK_ROUTE, "Route" },
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{ WS_NETLINK_UNUSED, "Unused" },
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{ WS_NETLINK_USERSOCK, "User-mode socket protocols" },
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{ WS_NETLINK_FIREWALL, "Unused (formerly: ip_queue)" },
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{ WS_NETLINK_SOCK_DIAG, "Socket monitoring" },
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{ WS_NETLINK_NFLOG, "Netfilter ULOG" },
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{ WS_NETLINK_XFRM, "IPsec" },
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{ WS_NETLINK_SELINUX, "SELinux events" },
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{ WS_NETLINK_ISCSI, "Open-iSCSI" },
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{ WS_NETLINK_AUDIT, "Auditing" },
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2014-10-04 15:28:35 +00:00
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{ WS_NETLINK_FIB_LOOKUP, "FIB lookup" },
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2016-08-06 14:42:19 +00:00
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{ WS_NETLINK_CONNECTOR, "Kernel connector" },
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{ WS_NETLINK_NETFILTER, "Netfilter" },
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{ WS_NETLINK_IP6_FW, "Unused (formerly: ip6_queue)" },
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{ WS_NETLINK_DNRTMSG, "DECnet routing messages" },
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{ WS_NETLINK_KOBJECT_UEVENT, "Kernel messages to userspace" },
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{ WS_NETLINK_GENERIC, "Generic" },
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2014-10-04 15:28:35 +00:00
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{ WS_NETLINK_SCSITRANSPORT, "SCSI Transports" },
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2016-08-06 14:42:19 +00:00
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{ WS_NETLINK_ECRYPTFS, "ecryptfs" },
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{ WS_NETLINK_RDMA, "RDMA" },
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{ WS_NETLINK_CRYPTO, "Crypto layer" },
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2013-12-08 12:01:32 +00:00
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{ 0, NULL }
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};
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2013-12-13 00:51:30 +00:00
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value_string_ext netlink_family_vals_ext = VALUE_STRING_EXT_INIT(netlink_family_vals);
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2013-12-08 19:30:33 +00:00
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static const value_string type_vals[] = {
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2016-08-06 14:42:19 +00:00
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{ WS_NLMSG_NOOP, "Nothing" },
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{ WS_NLMSG_ERROR, "Error" },
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{ WS_NLMSG_DONE, "End of a dump" },
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{ WS_NLMSG_OVERRUN, "Data lost" },
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2013-12-08 19:30:33 +00:00
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{ 0, NULL }
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};
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2013-12-08 12:01:32 +00:00
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2015-06-08 20:24:17 +00:00
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static const value_string ha_types[] = {
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{ ARPHRD_NETLINK, "Netlink" },
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{ 0, NULL }
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};
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2016-08-08 12:51:38 +00:00
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extern value_string_ext linux_negative_errno_vals_ext;
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2013-12-08 12:01:32 +00:00
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static dissector_handle_t netlink_handle;
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static header_field_info *hfi_netlink = NULL;
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#define NETLINK_HFI_INIT HFI_INIT(proto_netlink)
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static header_field_info hfi_netlink_hatype NETLINK_HFI_INIT =
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2016-08-06 14:42:19 +00:00
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{ "Link-layer address type", "netlink.hatype", FT_UINT16, BASE_DEC,
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2015-06-08 20:24:17 +00:00
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VALS(ha_types), 0x0, NULL, HFILL };
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2013-12-08 12:01:32 +00:00
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/* Linux netlink protocol type */
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static header_field_info hfi_netlink_family NETLINK_HFI_INIT =
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2016-08-06 14:42:19 +00:00
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{ "Family", "netlink.family", FT_UINT16, BASE_HEX | BASE_EXT_STRING,
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2015-06-08 20:24:17 +00:00
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&netlink_family_vals_ext, 0x00, NULL, HFILL };
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2013-12-08 12:01:32 +00:00
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static header_field_info hfi_netlink_hdr_len NETLINK_HFI_INIT =
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{ "Length", "netlink.hdr_len", FT_UINT32, BASE_DEC,
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2016-08-06 14:42:19 +00:00
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NULL, 0x00, "Length of message including header", HFILL };
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2013-12-08 12:01:32 +00:00
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static header_field_info hfi_netlink_hdr_type NETLINK_HFI_INIT =
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2016-08-06 14:42:19 +00:00
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{ "Message type", "netlink.hdr_type", FT_UINT16, BASE_HEX,
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VALS(type_vals), 0x00, "Type of message content", HFILL };
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2013-12-08 12:01:32 +00:00
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static header_field_info hfi_netlink_hdr_flags NETLINK_HFI_INIT =
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2016-08-06 14:42:19 +00:00
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{ "Flags", "netlink.hdr_flags", FT_UINT16, BASE_HEX,
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NULL, 0x00, "Additional flags", HFILL };
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static header_field_info hfi_netlink_hdr_flag_dumpfiltered NETLINK_HFI_INIT =
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{ "Dump filtered", "netlink.hdr_flags.dump_filtered", FT_UINT16, BASE_DEC,
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NULL, WS_NLM_F_DUMP_FILTERED, "Dump was filtered as requested", HFILL };
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static header_field_info hfi_netlink_hdr_flag_dumpintr NETLINK_HFI_INIT =
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{ "Dump inconsistent", "netlink.hdr_flags.dump_intr", FT_UINT16, BASE_DEC,
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NULL, WS_NLM_F_DUMP_INTR, "Dump was inconsistent due to sequence change", HFILL };
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2015-06-08 20:24:17 +00:00
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static header_field_info hfi_netlink_hdr_flag_echo NETLINK_HFI_INIT =
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{ "Echo", "netlink.hdr_flags.echo", FT_UINT16, BASE_DEC,
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2016-08-06 14:42:19 +00:00
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NULL, WS_NLM_F_ECHO, "Echo this request", HFILL };
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2015-06-08 20:24:17 +00:00
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static header_field_info hfi_netlink_hdr_flag_ack NETLINK_HFI_INIT =
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{ "Ack", "netlink.hdr_flags.ack", FT_UINT16, BASE_DEC,
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NULL, WS_NLM_F_ACK, "Asking for an ack", HFILL };
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static header_field_info hfi_netlink_hdr_flag_multi NETLINK_HFI_INIT =
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{ "Multipart message", "netlink.hdr_flags.multi", FT_UINT16, BASE_DEC,
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2016-08-06 14:42:19 +00:00
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NULL, WS_NLM_F_MULTI, "Part of multi-part message terminated by NLMSG_DONE", HFILL };
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2015-06-08 20:24:17 +00:00
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static header_field_info hfi_netlink_hdr_flag_request NETLINK_HFI_INIT =
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{ "Request", "netlink.hdr_flags.request", FT_UINT16, BASE_DEC,
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2016-08-06 14:42:19 +00:00
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NULL, WS_NLM_F_REQUEST, "It is a request message", HFILL };
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2015-06-08 20:24:17 +00:00
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static header_field_info hfi_netlink_hdr_flag_root NETLINK_HFI_INIT =
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{ "Specify tree root", "netlink.hdr_flags.root", FT_UINT16, BASE_DEC,
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2016-08-06 14:42:19 +00:00
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NULL, WS_NLM_F_ROOT, "Return the complete table instead of a single entry", HFILL };
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2015-06-08 20:24:17 +00:00
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static header_field_info hfi_netlink_hdr_flag_match NETLINK_HFI_INIT =
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2016-08-06 14:42:19 +00:00
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{ "Return all matching", "netlink.hdr_flags.match", FT_UINT16, BASE_DEC,
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NULL, WS_NLM_F_MATCH, "Return all entries matching criteria in request", HFILL };
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2015-06-08 20:24:17 +00:00
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static header_field_info hfi_netlink_hdr_flag_atomic NETLINK_HFI_INIT =
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{ "Atomic", "netlink.hdr_flags.atomic", FT_UINT16, BASE_DEC,
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2016-08-06 14:42:19 +00:00
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NULL, WS_NLM_F_ATOMIC, "Return an atomic snapshot of the table", HFILL };
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2015-06-08 20:24:17 +00:00
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static header_field_info hfi_netlink_hdr_flag_replace NETLINK_HFI_INIT =
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{ "Replace", "netlink.hdr_flags.replace", FT_UINT16, BASE_DEC,
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2016-08-06 14:42:19 +00:00
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NULL, WS_NLM_F_REPLACE, "Replace existing objects", HFILL };
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2015-06-08 20:24:17 +00:00
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static header_field_info hfi_netlink_hdr_flag_excl NETLINK_HFI_INIT =
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{ "Excl", "netlink.hdr_flags.excl", FT_UINT16, BASE_DEC,
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2016-08-06 14:42:19 +00:00
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NULL, WS_NLM_F_EXCL, "Do not replace existing objects", HFILL };
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2015-06-08 20:24:17 +00:00
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static header_field_info hfi_netlink_hdr_flag_create NETLINK_HFI_INIT =
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{ "Create", "netlink.hdr_flags.create", FT_UINT16, BASE_DEC,
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2016-08-06 14:42:19 +00:00
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NULL, WS_NLM_F_CREATE, "Create objects if it does not already exist", HFILL };
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2015-06-08 20:24:17 +00:00
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static header_field_info hfi_netlink_hdr_flag_append NETLINK_HFI_INIT =
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{ "Append", "netlink.hdr_flags.append", FT_UINT16, BASE_DEC,
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2016-08-06 14:42:19 +00:00
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NULL, WS_NLM_F_APPEND, "Add to end of object list", HFILL };
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2013-12-08 12:01:32 +00:00
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static header_field_info hfi_netlink_hdr_seq NETLINK_HFI_INIT =
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2015-06-08 20:24:17 +00:00
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{ "Sequence", "netlink.hdr_seq", FT_UINT32, BASE_DEC,
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2016-08-06 14:42:19 +00:00
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NULL, 0x00, "Sequence number", HFILL };
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2013-12-08 12:01:32 +00:00
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static header_field_info hfi_netlink_hdr_pid NETLINK_HFI_INIT =
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2015-06-08 20:24:17 +00:00
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{ "Port ID", "netlink.hdr_pid", FT_UINT32, BASE_DEC,
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2016-08-06 14:42:19 +00:00
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NULL, 0x00, "Sender port ID", HFILL };
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2013-12-08 12:01:32 +00:00
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2017-04-18 07:00:01 +00:00
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static header_field_info hfi_netlink_attr_len NETLINK_HFI_INIT =
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{ "Len", "netlink.attr_len", FT_UINT16, BASE_DEC,
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NULL, 0x00, NULL, HFILL };
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2016-08-11 21:30:06 +00:00
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static header_field_info hfi_netlink_attr_type NETLINK_HFI_INIT =
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{ "Type", "netlink.attr_type", FT_UINT16, BASE_HEX,
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NULL, 0x0000, "Netlink Attribute type", HFILL };
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static header_field_info hfi_netlink_attr_type_nested NETLINK_HFI_INIT =
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{ "Nested", "netlink.attr_type.nested", FT_UINT16, BASE_DEC,
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NULL, NLA_F_NESTED, "Carries nested attributes", HFILL };
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static header_field_info hfi_netlink_attr_type_net_byteorder NETLINK_HFI_INIT =
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{ "Network byte order", "netlink.attr_type.net_byteorder", FT_UINT16, BASE_DEC,
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NULL, NLA_F_NET_BYTEORDER, "Payload stored in network byte order", HFILL };
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2017-04-04 11:13:59 +00:00
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static header_field_info hfi_netlink_attr_index NETLINK_HFI_INIT =
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{ "Index", "netlink.attr_index", FT_UINT16, BASE_DEC,
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NULL, 0x0000, "Netlink Attribute type (array index)", HFILL };
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2017-04-18 07:00:01 +00:00
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static header_field_info hfi_netlink_attr_data NETLINK_HFI_INIT =
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{ "Data", "netlink.attr_data", FT_BYTES, BASE_NONE,
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2015-06-08 20:24:17 +00:00
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NULL, 0x00, NULL, HFILL };
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2014-08-17 20:11:15 +00:00
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2016-08-06 14:42:19 +00:00
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/* TODO add a value_string for errno. */
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static header_field_info hfi_netlink_error NETLINK_HFI_INIT =
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2016-08-08 12:51:38 +00:00
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{ "Error code", "netlink.error", FT_INT32, BASE_DEC | BASE_EXT_STRING,
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&linux_negative_errno_vals_ext, 0x00, "Negative errno or 0 for acknowledgements", HFILL };
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2016-08-06 14:42:19 +00:00
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2013-12-08 12:01:32 +00:00
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static gint ett_netlink_cooked = -1;
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static gint ett_netlink_msghdr = -1;
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static gint ett_netlink_msg = -1;
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2015-06-08 20:24:17 +00:00
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static gint ett_netlink_hdr_flags = -1;
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2016-08-11 21:30:06 +00:00
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static gint ett_netlink_attr_type = -1;
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2013-12-08 12:01:32 +00:00
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static dissector_table_t netlink_dissector_table;
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2015-06-08 20:24:17 +00:00
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static const int *netlink_header_get_flags[] = {
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&hfi_netlink_hdr_flag_request.id,
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&hfi_netlink_hdr_flag_multi.id,
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&hfi_netlink_hdr_flag_ack.id,
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&hfi_netlink_hdr_flag_echo.id,
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2016-08-06 14:42:19 +00:00
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&hfi_netlink_hdr_flag_dumpintr.id,
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&hfi_netlink_hdr_flag_dumpfiltered.id,
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2015-06-08 20:24:17 +00:00
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&hfi_netlink_hdr_flag_root.id,
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&hfi_netlink_hdr_flag_match.id,
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&hfi_netlink_hdr_flag_atomic.id,
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NULL
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};
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static const int *netlink_header_new_flags[] = {
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&hfi_netlink_hdr_flag_request.id,
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&hfi_netlink_hdr_flag_multi.id,
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&hfi_netlink_hdr_flag_ack.id,
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&hfi_netlink_hdr_flag_echo.id,
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2016-08-06 14:42:19 +00:00
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&hfi_netlink_hdr_flag_dumpintr.id,
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&hfi_netlink_hdr_flag_dumpfiltered.id,
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2015-06-08 20:24:17 +00:00
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&hfi_netlink_hdr_flag_replace.id,
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&hfi_netlink_hdr_flag_excl.id,
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&hfi_netlink_hdr_flag_create.id,
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&hfi_netlink_hdr_flag_append.id,
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NULL
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};
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2016-08-17 19:14:57 +00:00
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static const int *netlink_header_standard_flags[] = {
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&hfi_netlink_hdr_flag_request.id,
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&hfi_netlink_hdr_flag_multi.id,
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&hfi_netlink_hdr_flag_ack.id,
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&hfi_netlink_hdr_flag_echo.id,
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&hfi_netlink_hdr_flag_dumpintr.id,
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&hfi_netlink_hdr_flag_dumpfiltered.id,
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NULL
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};
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2015-06-08 20:24:17 +00:00
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2017-04-04 11:13:59 +00:00
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static int
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dissect_netlink_attributes_common(tvbuff_t *tvb, header_field_info *hfi_type, int ett_tree, int ett_attrib, void *data, struct packet_netlink_data *nl_data, proto_tree *tree, int offset, int length, netlink_attributes_cb_t cb)
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2013-12-11 20:48:18 +00:00
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{
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2016-08-31 18:06:49 +00:00
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int encoding;
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2016-08-11 21:30:06 +00:00
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int padding = (4 - offset) & 3;
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2016-08-31 18:06:49 +00:00
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DISSECTOR_ASSERT(nl_data);
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encoding = nl_data->encoding;
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2013-12-11 20:48:18 +00:00
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/* align to 4 */
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2016-08-11 21:30:06 +00:00
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offset += padding;
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if (length == -1) {
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length = tvb_captured_length_remaining(tvb, offset);
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} else {
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length -= padding;
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}
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2013-12-11 20:48:18 +00:00
|
|
|
|
2016-08-11 21:30:06 +00:00
|
|
|
while (length >= 4) {
|
|
|
|
guint16 rta_len, rta_type, type;
|
2013-12-11 20:48:18 +00:00
|
|
|
|
2016-08-11 21:30:06 +00:00
|
|
|
proto_item *ti, *type_item;
|
|
|
|
proto_tree *attr_tree, *type_tree;
|
2013-12-11 20:48:18 +00:00
|
|
|
|
2016-08-31 18:06:49 +00:00
|
|
|
rta_len = tvb_get_guint16(tvb, offset, encoding);
|
2013-12-11 20:48:18 +00:00
|
|
|
if (rta_len < 4) {
|
|
|
|
/* XXX invalid expert */
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
2016-08-11 21:30:06 +00:00
|
|
|
/* XXX expert info when rta_len < length? */
|
|
|
|
rta_len = MIN(rta_len, length);
|
2013-12-11 20:48:18 +00:00
|
|
|
|
2017-04-04 11:13:59 +00:00
|
|
|
attr_tree = proto_tree_add_subtree(tree, tvb, offset, rta_len, ett_tree, &ti, "Attribute");
|
2013-12-11 20:48:18 +00:00
|
|
|
|
2016-08-31 18:06:49 +00:00
|
|
|
proto_tree_add_item(attr_tree, &hfi_netlink_attr_len, tvb, offset, 2, encoding);
|
2013-12-11 20:48:18 +00:00
|
|
|
offset += 2;
|
|
|
|
|
2016-08-31 18:06:49 +00:00
|
|
|
rta_type = tvb_get_guint16(tvb, offset, encoding);
|
2017-04-04 11:13:59 +00:00
|
|
|
if (ett_attrib == -1) {
|
|
|
|
/* List of attributes */
|
|
|
|
type = rta_type & NLA_TYPE_MASK;
|
|
|
|
type_item = proto_tree_add_item(attr_tree, &hfi_netlink_attr_type, tvb, offset, 2, encoding);
|
|
|
|
type_tree = proto_item_add_subtree(type_item, ett_netlink_attr_type);
|
|
|
|
proto_tree_add_item(type_tree, &hfi_netlink_attr_type_nested, tvb, offset, 2, encoding);
|
|
|
|
proto_tree_add_item(type_tree, &hfi_netlink_attr_type_net_byteorder, tvb, offset, 2, encoding);
|
|
|
|
proto_tree_add_item(type_tree, hfi_type, tvb, offset, 2, encoding);
|
|
|
|
offset += 2;
|
|
|
|
|
|
|
|
if (rta_type & NLA_F_NESTED)
|
|
|
|
proto_item_append_text(type_item, ", Nested");
|
|
|
|
|
|
|
|
if (hfi_type->strings) {
|
|
|
|
/* XXX, export hf_try_val_to_str */
|
2017-04-04 23:51:19 +00:00
|
|
|
const char *rta_str;
|
|
|
|
|
|
|
|
if (hfi_type->display & BASE_EXT_STRING) {
|
|
|
|
rta_str = try_val_to_str_ext(type, (value_string_ext *)hfi_type->strings);
|
|
|
|
} else {
|
|
|
|
rta_str = try_val_to_str(type, (const value_string *) hfi_type->strings);
|
|
|
|
}
|
2017-04-04 11:13:59 +00:00
|
|
|
|
|
|
|
if (rta_str) {
|
|
|
|
proto_item_append_text(type_item, ", %s (%d)", rta_str, type);
|
|
|
|
proto_item_append_text(ti, ": %s", rta_str);
|
|
|
|
}
|
|
|
|
}
|
2013-12-11 20:48:18 +00:00
|
|
|
|
2017-04-04 11:13:59 +00:00
|
|
|
if (!cb(tvb, data, attr_tree, rta_type, offset, rta_len - 4)) {
|
2017-04-18 07:00:01 +00:00
|
|
|
proto_tree_add_item(attr_tree, &hfi_netlink_attr_data, tvb, offset, rta_len - 4, encoding);
|
2016-08-11 21:30:06 +00:00
|
|
|
}
|
2017-04-04 11:13:59 +00:00
|
|
|
} else {
|
|
|
|
/*
|
|
|
|
* Nested attributes, constructing an array (list of
|
|
|
|
* attributes where its type is the array index and its
|
|
|
|
* value is the actual list of interesting attributes).
|
|
|
|
*/
|
|
|
|
proto_tree_add_item(attr_tree, &hfi_netlink_attr_index, tvb, offset, 2, encoding);
|
|
|
|
offset += 2;
|
|
|
|
proto_item_append_text(ti, " %u", rta_type);
|
2013-12-11 20:48:18 +00:00
|
|
|
|
2017-04-04 11:13:59 +00:00
|
|
|
dissect_netlink_attributes(tvb, hfi_type, ett_attrib, data, nl_data, attr_tree, offset, rta_len - 4, cb);
|
2013-12-11 20:48:18 +00:00
|
|
|
}
|
|
|
|
|
2016-08-11 21:30:06 +00:00
|
|
|
/* Assume offset already aligned, next offset is rta_len plus alignment. */
|
|
|
|
rta_len = MIN((rta_len + 3) & ~3, length);
|
|
|
|
offset += rta_len - 4; /* Header was already skipped */
|
|
|
|
length -= rta_len;
|
2013-12-11 20:48:18 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
return offset;
|
|
|
|
}
|
|
|
|
|
2017-04-04 11:13:59 +00:00
|
|
|
int
|
|
|
|
dissect_netlink_attributes(tvbuff_t *tvb, header_field_info *hfi_type, int ett, void *data, struct packet_netlink_data *nl_data, proto_tree *tree, int offset, int length, netlink_attributes_cb_t cb)
|
|
|
|
{
|
|
|
|
return dissect_netlink_attributes_common(tvb, hfi_type, ett, -1, data, nl_data, tree, offset, length, cb);
|
|
|
|
}
|
|
|
|
|
|
|
|
int
|
|
|
|
dissect_netlink_attributes_array(tvbuff_t *tvb, header_field_info *hfi_type, int ett_array, int ett_attrib, void *data, struct packet_netlink_data *nl_data, proto_tree *tree, int offset, int length, netlink_attributes_cb_t cb)
|
|
|
|
{
|
|
|
|
DISSECTOR_ASSERT(ett_attrib != -1);
|
|
|
|
return dissect_netlink_attributes_common(tvb, hfi_type, ett_array, ett_attrib, data, nl_data, tree, offset, length, cb);
|
|
|
|
}
|
|
|
|
|
2017-04-04 19:30:45 +00:00
|
|
|
int
|
|
|
|
dissect_netlink_header(tvbuff_t *tvb, proto_tree *tree, int offset, int encoding, header_field_info *hfi_type, proto_item **pi_type)
|
2016-08-06 14:42:19 +00:00
|
|
|
{
|
|
|
|
guint16 hdr_flags;
|
|
|
|
guint16 hdr_type;
|
|
|
|
proto_tree *fh_hdr;
|
2017-04-04 19:30:45 +00:00
|
|
|
proto_item *pi;
|
2016-08-06 14:42:19 +00:00
|
|
|
|
2017-04-16 22:54:32 +00:00
|
|
|
fh_hdr = proto_tree_add_subtree(tree, tvb, offset, 16, ett_netlink_msghdr, NULL, "Netlink message header");
|
2016-08-06 14:42:19 +00:00
|
|
|
|
|
|
|
proto_tree_add_item(fh_hdr, &hfi_netlink_hdr_len, tvb, offset, 4, encoding);
|
|
|
|
offset += 4;
|
|
|
|
|
2016-08-31 17:44:25 +00:00
|
|
|
hdr_type = tvb_get_guint16(tvb, offset, encoding);
|
2017-04-04 19:30:45 +00:00
|
|
|
if (hdr_type < WS_NLMSG_MIN_TYPE) {
|
|
|
|
/* Reserved control messages. */
|
|
|
|
hfi_type = &hfi_netlink_hdr_type;
|
|
|
|
pi = proto_tree_add_item(fh_hdr, hfi_type, tvb, offset, 2, encoding);
|
|
|
|
} else {
|
|
|
|
if (hfi_type) {
|
|
|
|
pi = proto_tree_add_item(fh_hdr, hfi_type, tvb, offset, 2, encoding);
|
|
|
|
} else {
|
|
|
|
hfi_type = &hfi_netlink_hdr_type;
|
|
|
|
pi = proto_tree_add_item(fh_hdr, hfi_type, tvb, offset, 2, encoding);
|
|
|
|
proto_item_set_text(pi, "Message type: Protocol-specific (0x%04x)", hdr_type);
|
|
|
|
}
|
2016-08-06 14:42:19 +00:00
|
|
|
}
|
2017-04-04 19:30:45 +00:00
|
|
|
if (pi_type) {
|
|
|
|
*pi_type = pi;
|
|
|
|
}
|
|
|
|
/* TODO export hf_try_val_to_str? */
|
|
|
|
if (hfi_type->strings && hfi_type->display & BASE_EXT_STRING) {
|
|
|
|
proto_item_append_text(fh_hdr, " (type: %s)", val_to_str_ext(hdr_type, (value_string_ext *)hfi_type->strings, "0x%04x"));
|
|
|
|
} else if (hfi_type->strings) {
|
|
|
|
proto_item_append_text(fh_hdr, " (type: %s)", val_to_str(hdr_type, (const value_string *)hfi_type->strings, "0x%04x"));
|
|
|
|
} else {
|
|
|
|
proto_item_append_text(fh_hdr, " (type: 0x%04x)", hdr_type);
|
2016-08-06 14:42:19 +00:00
|
|
|
}
|
|
|
|
offset += 2;
|
|
|
|
|
2016-08-17 19:14:57 +00:00
|
|
|
hdr_flags = tvb_get_guint16(tvb, offset, encoding);
|
|
|
|
if ((hdr_flags & WS_NLM_F_REQUEST) && (hdr_flags & 0x0f00)) {
|
|
|
|
/* XXX detect based on the protocol family and message type
|
|
|
|
* whether this is a GET, NEW or regular request. */
|
2018-06-04 06:57:35 +00:00
|
|
|
proto_tree_add_bitmask(fh_hdr, tvb, offset, &hfi_netlink_hdr_flags,
|
2016-08-17 19:14:57 +00:00
|
|
|
ett_netlink_hdr_flags, netlink_header_get_flags, encoding);
|
2018-06-04 06:57:35 +00:00
|
|
|
proto_tree_add_bitmask(fh_hdr, tvb, offset, &hfi_netlink_hdr_flags,
|
2016-08-17 19:14:57 +00:00
|
|
|
ett_netlink_hdr_flags, netlink_header_new_flags, encoding);
|
|
|
|
} else {
|
2018-06-04 06:57:35 +00:00
|
|
|
proto_tree_add_bitmask(fh_hdr, tvb, offset, &hfi_netlink_hdr_flags,
|
2016-08-17 19:14:57 +00:00
|
|
|
ett_netlink_hdr_flags, netlink_header_standard_flags, encoding);
|
2016-08-06 14:42:19 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
offset += 2;
|
|
|
|
|
|
|
|
proto_tree_add_item(fh_hdr, &hfi_netlink_hdr_seq, tvb, offset, 4, encoding);
|
|
|
|
offset += 4;
|
|
|
|
|
2017-04-04 19:30:45 +00:00
|
|
|
proto_tree_add_item(fh_hdr, &hfi_netlink_hdr_pid, tvb, offset, 4, encoding);
|
2016-08-06 14:42:19 +00:00
|
|
|
offset += 4;
|
|
|
|
|
|
|
|
return offset;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
dissect_netlink_error(tvbuff_t *tvb, proto_tree *tree, int offset, int encoding)
|
|
|
|
{
|
2016-08-23 18:50:51 +00:00
|
|
|
/*
|
|
|
|
* XXX - this should make sure we don't run past the end of the
|
|
|
|
* message.
|
|
|
|
*/
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Assume sizeof(int) == 4; RFC 3549 doesn't say "32 bits", it
|
|
|
|
* says "integer (typically 32 bits)".
|
|
|
|
*/
|
2016-08-06 14:42:19 +00:00
|
|
|
proto_tree_add_item(tree, &hfi_netlink_error, tvb, offset, 4, encoding);
|
|
|
|
offset += 4;
|
|
|
|
|
2017-04-04 19:30:45 +00:00
|
|
|
dissect_netlink_header(tvb, tree, offset, encoding, NULL, NULL);
|
2016-08-06 14:42:19 +00:00
|
|
|
}
|
|
|
|
|
2013-12-08 12:01:32 +00:00
|
|
|
static int
|
|
|
|
dissect_netlink(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *_data _U_)
|
|
|
|
{
|
2014-10-04 15:28:35 +00:00
|
|
|
guint16 protocol, hatype;
|
2013-12-08 12:01:32 +00:00
|
|
|
proto_item *ti;
|
2014-10-04 15:28:35 +00:00
|
|
|
tvbuff_t *next_tvb;
|
2016-01-17 16:22:47 +00:00
|
|
|
proto_tree *fh_tree;
|
2013-12-08 12:01:32 +00:00
|
|
|
|
|
|
|
int offset;
|
2016-08-31 17:44:25 +00:00
|
|
|
int encoding;
|
|
|
|
guint len_rem, len_le, len_be;
|
2013-12-08 12:01:32 +00:00
|
|
|
|
|
|
|
hatype = tvb_get_ntohs(tvb, 2);
|
|
|
|
if (hatype != ARPHRD_NETLINK)
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
col_set_str(pinfo->cinfo, COL_PROTOCOL, "Netlink");
|
|
|
|
col_clear(pinfo->cinfo, COL_INFO);
|
|
|
|
|
2016-01-17 16:22:47 +00:00
|
|
|
ti = proto_tree_add_protocol_format(tree, hfi_netlink->id, tvb, 0,
|
|
|
|
SLL_HEADER_SIZE, "Linux netlink (cooked header)");
|
|
|
|
fh_tree = proto_item_add_subtree(ti, ett_netlink_cooked);
|
2013-12-08 12:01:32 +00:00
|
|
|
|
|
|
|
/* Unused 2B */
|
|
|
|
offset = 2;
|
|
|
|
|
|
|
|
proto_tree_add_item(fh_tree, &hfi_netlink_hatype, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
|
|
offset += 2;
|
|
|
|
|
|
|
|
/* Unused 10B */
|
|
|
|
offset += 10;
|
|
|
|
|
|
|
|
protocol = tvb_get_ntohs(tvb, offset);
|
|
|
|
proto_tree_add_item(fh_tree, &hfi_netlink_family, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
|
|
offset += 2;
|
|
|
|
|
|
|
|
/* DISSECTOR_ASSERT(offset == 16); */
|
|
|
|
|
2016-08-31 17:44:25 +00:00
|
|
|
/*
|
|
|
|
* We are unable to detect the endianness, we have to guess. Compare
|
|
|
|
* the size of the inner package with the size of the outer package,
|
|
|
|
* take the endianness in which the inner package length is closer to
|
|
|
|
* the size of the outer package. Normally we have packages with less
|
|
|
|
* than 10KB here so the sizes are very huge in the wrong endianness.
|
|
|
|
*/
|
|
|
|
len_rem = tvb_reported_length_remaining(tvb, offset);
|
|
|
|
len_le = tvb_get_letohl(tvb, offset);
|
|
|
|
len_be = tvb_get_ntohl(tvb, offset);
|
|
|
|
#define abs_diff(a, b) ((a) > (b) ? (a) - (b) : (b) - (a))
|
|
|
|
if (abs_diff(len_be, len_rem) < abs_diff(len_le, len_rem)) {
|
|
|
|
encoding = ENC_BIG_ENDIAN;
|
|
|
|
} else {
|
|
|
|
encoding = ENC_LITTLE_ENDIAN;
|
|
|
|
}
|
|
|
|
|
2013-12-08 12:01:32 +00:00
|
|
|
while (tvb_reported_length_remaining(tvb, offset) >= 16) {
|
|
|
|
int pkt_end_offset;
|
2017-04-04 19:30:45 +00:00
|
|
|
guint16 msg_type;
|
2013-12-08 12:01:32 +00:00
|
|
|
guint32 pkt_len;
|
2013-12-13 22:34:10 +00:00
|
|
|
guint32 port_id;
|
2013-12-08 12:01:32 +00:00
|
|
|
proto_tree *fh_msg;
|
2017-04-04 19:30:45 +00:00
|
|
|
gboolean dissected = FALSE;
|
2015-06-08 20:24:17 +00:00
|
|
|
|
2016-08-31 17:44:25 +00:00
|
|
|
pkt_len = tvb_get_guint32(tvb, offset, encoding);
|
2013-12-08 12:01:32 +00:00
|
|
|
|
|
|
|
pkt_end_offset = offset + pkt_len;
|
|
|
|
|
2016-08-23 18:39:56 +00:00
|
|
|
if (pkt_len < 16) {
|
|
|
|
/*
|
|
|
|
* This field includes the length of the 16-byte header,
|
|
|
|
* so its value is invalid. Add it, report an error,
|
|
|
|
* and stop trying to dissect.
|
|
|
|
*/
|
|
|
|
proto_tree *fh_hdr;
|
|
|
|
|
2017-04-16 22:54:32 +00:00
|
|
|
fh_hdr = proto_tree_add_subtree(tree, tvb, offset, 4, ett_netlink_msghdr, NULL, "Netlink message header");
|
2016-08-23 18:39:56 +00:00
|
|
|
|
|
|
|
proto_tree_add_item(fh_hdr, &hfi_netlink_hdr_len, tvb, offset, 4, encoding);
|
|
|
|
/* XXX invalid expert */
|
|
|
|
break;
|
|
|
|
}
|
2016-08-23 18:41:24 +00:00
|
|
|
|
2017-04-04 19:30:45 +00:00
|
|
|
/* message type field comes after length field. */
|
|
|
|
msg_type = tvb_get_guint16(tvb, offset + 4, encoding);
|
|
|
|
port_id = tvb_get_guint32(tvb, offset + 12, encoding);
|
2013-12-08 12:01:32 +00:00
|
|
|
|
2013-12-13 22:34:10 +00:00
|
|
|
/* XXX */
|
|
|
|
if (port_id == 0x00)
|
|
|
|
pinfo->p2p_dir = P2P_DIR_SENT; /* userspace -> kernel */
|
|
|
|
else
|
|
|
|
pinfo->p2p_dir = P2P_DIR_RECV; /* userspace or kernel -> userspace */
|
|
|
|
|
2017-04-04 19:30:45 +00:00
|
|
|
/*
|
|
|
|
* Try to invoke subdissectors for non-control messages.
|
|
|
|
*/
|
|
|
|
if (msg_type >= WS_NLMSG_MIN_TYPE && pkt_len > 16) {
|
|
|
|
struct packet_netlink_data data;
|
|
|
|
|
2013-12-08 12:01:32 +00:00
|
|
|
data.magic = PACKET_NETLINK_MAGIC;
|
|
|
|
data.encoding = encoding;
|
2017-04-04 19:30:45 +00:00
|
|
|
data.type = msg_type;
|
2013-12-08 12:01:32 +00:00
|
|
|
|
2017-04-04 19:30:45 +00:00
|
|
|
next_tvb = tvb_new_subset_length(tvb, offset, pkt_len);
|
2013-12-08 12:01:32 +00:00
|
|
|
|
2017-04-04 19:30:45 +00:00
|
|
|
if (dissector_try_uint_new(netlink_dissector_table, protocol, next_tvb, pinfo, tree, TRUE, &data)) {
|
|
|
|
dissected = TRUE;
|
|
|
|
}
|
|
|
|
}
|
2013-12-08 12:01:32 +00:00
|
|
|
|
2017-04-04 19:30:45 +00:00
|
|
|
if (!dissected) {
|
|
|
|
/*
|
|
|
|
* No subdissector was called, add a new layer with the
|
|
|
|
* header and the payload. Note that pkt_len>=16.
|
|
|
|
*/
|
|
|
|
fh_msg = proto_tree_add_subtree(tree, tvb, offset, pkt_len, ett_netlink_msg, NULL, "Netlink message");
|
|
|
|
offset = dissect_netlink_header(tvb, fh_msg, offset, encoding, NULL, NULL);
|
|
|
|
|
|
|
|
if (msg_type == WS_NLMSG_ERROR) {
|
|
|
|
dissect_netlink_error(tvb, fh_msg, offset, encoding);
|
|
|
|
} else if (pkt_len > 16) {
|
|
|
|
next_tvb = tvb_new_subset_length(tvb, offset, pkt_len - 16);
|
|
|
|
call_data_dissector(next_tvb, pinfo, fh_msg);
|
|
|
|
}
|
2013-12-08 12:01:32 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
offset = pkt_end_offset;
|
|
|
|
}
|
|
|
|
|
|
|
|
return offset;
|
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
proto_register_netlink(void)
|
|
|
|
{
|
|
|
|
#ifndef HAVE_HFI_SECTION_INIT
|
|
|
|
static header_field_info *hfi[] = {
|
|
|
|
/* Cooked header */
|
|
|
|
&hfi_netlink_hatype,
|
|
|
|
&hfi_netlink_family,
|
|
|
|
|
|
|
|
/* Netlink message header */
|
|
|
|
&hfi_netlink_hdr_len,
|
|
|
|
&hfi_netlink_hdr_type,
|
|
|
|
&hfi_netlink_hdr_flags,
|
2015-06-08 20:24:17 +00:00
|
|
|
&hfi_netlink_hdr_flag_request,
|
|
|
|
&hfi_netlink_hdr_flag_multi,
|
2016-08-06 14:42:19 +00:00
|
|
|
&hfi_netlink_hdr_flag_ack,
|
|
|
|
&hfi_netlink_hdr_flag_echo,
|
|
|
|
&hfi_netlink_hdr_flag_dumpintr,
|
|
|
|
&hfi_netlink_hdr_flag_dumpfiltered,
|
2015-06-08 20:24:17 +00:00
|
|
|
|
|
|
|
&hfi_netlink_hdr_flag_root,
|
|
|
|
&hfi_netlink_hdr_flag_match,
|
|
|
|
&hfi_netlink_hdr_flag_atomic,
|
|
|
|
|
|
|
|
&hfi_netlink_hdr_flag_replace,
|
|
|
|
&hfi_netlink_hdr_flag_excl,
|
|
|
|
&hfi_netlink_hdr_flag_create,
|
|
|
|
&hfi_netlink_hdr_flag_append,
|
|
|
|
|
2013-12-08 12:01:32 +00:00
|
|
|
&hfi_netlink_hdr_seq,
|
|
|
|
&hfi_netlink_hdr_pid,
|
2015-01-23 03:40:01 +00:00
|
|
|
|
|
|
|
/* Netlink message attribute */
|
|
|
|
&hfi_netlink_attr_len,
|
2016-08-11 21:30:06 +00:00
|
|
|
&hfi_netlink_attr_type,
|
|
|
|
&hfi_netlink_attr_type_nested,
|
|
|
|
&hfi_netlink_attr_type_net_byteorder,
|
2017-04-04 11:13:59 +00:00
|
|
|
&hfi_netlink_attr_index,
|
2017-04-18 07:00:01 +00:00
|
|
|
&hfi_netlink_attr_data,
|
2016-08-06 14:42:19 +00:00
|
|
|
|
|
|
|
/* Netlink message payloads */
|
|
|
|
&hfi_netlink_error,
|
2013-12-08 12:01:32 +00:00
|
|
|
};
|
|
|
|
#endif
|
|
|
|
|
|
|
|
static gint *ett[] = {
|
|
|
|
&ett_netlink_cooked,
|
|
|
|
&ett_netlink_msghdr,
|
2015-06-08 20:24:17 +00:00
|
|
|
&ett_netlink_msg,
|
2016-08-11 21:30:06 +00:00
|
|
|
&ett_netlink_hdr_flags,
|
|
|
|
&ett_netlink_attr_type,
|
2013-12-08 12:01:32 +00:00
|
|
|
};
|
|
|
|
|
|
|
|
int proto_netlink;
|
|
|
|
|
|
|
|
proto_netlink = proto_register_protocol("Linux netlink protocol", "NETLINK", "netlink" );
|
|
|
|
hfi_netlink = proto_registrar_get_nth(proto_netlink);
|
|
|
|
|
|
|
|
proto_register_fields(proto_netlink, hfi, array_length(hfi));
|
|
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
|
|
|
2015-12-09 03:49:44 +00:00
|
|
|
netlink_handle = create_dissector_handle(dissect_netlink, proto_netlink);
|
2013-12-08 12:01:32 +00:00
|
|
|
|
|
|
|
netlink_dissector_table = register_dissector_table(
|
|
|
|
"netlink.protocol",
|
|
|
|
"Linux netlink protocol type",
|
2016-03-13 11:51:45 +00:00
|
|
|
proto_netlink, FT_UINT16,
|
2016-08-30 22:51:54 +00:00
|
|
|
BASE_HEX
|
2013-12-08 12:01:32 +00:00
|
|
|
);
|
2016-01-16 15:56:49 +00:00
|
|
|
register_dissector("netlink", dissect_netlink, proto_netlink);
|
2013-12-08 12:01:32 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
proto_reg_handoff_netlink(void)
|
|
|
|
{
|
|
|
|
dissector_add_uint("wtap_encap", WTAP_ENCAP_NETLINK, netlink_handle);
|
|
|
|
}
|
2014-10-04 15:28:35 +00:00
|
|
|
|
|
|
|
/*
|
2019-07-26 18:43:17 +00:00
|
|
|
* Editor modelines - https://www.wireshark.org/tools/modelines.html
|
2014-10-04 15:28:35 +00:00
|
|
|
*
|
|
|
|
* Local variables:
|
|
|
|
* c-basic-offset: 8
|
|
|
|
* tab-width: 8
|
|
|
|
* indent-tabs-mode: t
|
|
|
|
* End:
|
|
|
|
*
|
|
|
|
* vi: set shiftwidth=8 tabstop=8 noexpandtab:
|
|
|
|
* :indentSize=8:tabSize=8:noTabs=false:
|
|
|
|
*/
|