2019-07-20 14:19:10 +00:00
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/* packet-netlink-net_dm.c
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* Routines for netlink-net_dm dissection
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* Based on netlink-route and netlink-generic dissectors
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* Copyright 2019, Mellanox Technologies Ltd.
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* Code by Ido Schimmel <idosch@mellanox.com>
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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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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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/* net_dm (network drop monitor) is a netlink-based protocol via which alerts
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* about dropped packets are sent to user space
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*
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2019-12-27 22:36:56 +00:00
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* Relevant Linux kernel header file:
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* include/uapi/linux/net_dropmon.h
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2019-07-20 14:19:10 +00:00
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*
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* Man page:
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* man 1 dropwatch
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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/packet.h>
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#include "packet-netlink.h"
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#include "packet-sll.h"
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void proto_register_netlink_net_dm(void);
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void proto_reg_handoff_netlink_net_dm(void);
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enum ws_net_dm_commands {
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WS_NET_DM_CMD_UNSPEC,
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WS_NET_DM_CMD_ALERT,
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WS_NET_DM_CMD_CONFIG,
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WS_NET_DM_CMD_START,
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WS_NET_DM_CMD_STOP,
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WS_NET_DM_CMD_PACKET_ALERT,
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WS_NET_DM_CMD_CONFIG_GET,
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WS_NET_DM_CMD_CONFIG_NEW,
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WS_NET_DM_CMD_STATS_GET,
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WS_NET_DM_CMD_STATS_NEW,
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};
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enum ws_net_dm_attrs {
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WS_NET_DM_ATTR_UNSPEC,
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WS_NET_DM_ATTR_ALERT_MODE,
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WS_NET_DM_ATTR_PC,
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WS_NET_DM_ATTR_SYMBOL,
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WS_NET_DM_ATTR_IN_PORT,
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WS_NET_DM_ATTR_TIMESTAMP,
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WS_NET_DM_ATTR_PROTO,
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WS_NET_DM_ATTR_PAYLOAD,
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WS_NET_DM_ATTR_PAD,
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WS_NET_DM_ATTR_TRUNC_LEN,
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WS_NET_DM_ATTR_ORIG_LEN,
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WS_NET_DM_ATTR_QUEUE_LEN,
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WS_NET_DM_ATTR_STATS,
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WS_NET_DM_ATTR_HW_STATS,
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WS_NET_DM_ATTR_ORIGIN,
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WS_NET_DM_ATTR_HW_TRAP_GROUP_NAME,
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WS_NET_DM_ATTR_HW_TRAP_NAME,
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WS_NET_DM_ATTR_HW_ENTRIES,
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WS_NET_DM_ATTR_HW_ENTRY,
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WS_NET_DM_ATTR_HW_TRAP_COUNT,
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WS_NET_DM_ATTR_SW_DROPS,
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WS_NET_DM_ATTR_HW_DROPS,
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2020-01-25 13:28:03 +00:00
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WS_NET_DM_ATTR_FLOW_ACTION_COOKIE,
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2019-07-20 14:19:10 +00:00
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};
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enum ws_net_dm_attrs_port {
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WS_NET_DM_ATTR_PORT_NETDEV_IFINDEX,
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WS_NET_DM_ATTR_PORT_NETDEV_NAME,
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};
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enum ws_net_dm_attrs_stats {
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WS_NET_DM_ATTR_STATS_DROPPED,
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};
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enum ws_net_dm_alert_mode {
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WS_NET_DM_ALERT_MODE_SUMMARY,
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WS_NET_DM_ALERT_MODE_PACKET,
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};
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enum ws_net_dm_origin {
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WS_NET_DM_ORIGIN_SW,
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WS_NET_DM_ORIGIN_HW,
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};
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struct netlink_net_dm_info {
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packet_info *pinfo;
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guint16 protocol; /* protocol for packet payload */
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};
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static int proto_netlink_net_dm = -1;
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static dissector_handle_t netlink_net_dm_handle;
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static dissector_table_t sll_ltype_table;
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static header_field_info *hfi_netlink_net_dm = NULL;
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#define NETLINK_NET_DM_HFI_INIT HFI_INIT(proto_netlink_net_dm)
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static gint ett_net_dm = -1;
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static gint ett_net_dm_attrs = -1;
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static gint ett_net_dm_attrs_in_port = -1;
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static gint ett_net_dm_attrs_stats = -1;
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static gint ett_net_dm_attrs_hw_stats = -1;
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static gint ett_net_dm_attrs_hw_entries = -1;
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static gint ett_net_dm_attrs_hw_entry = -1;
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static const value_string ws_net_dm_commands_vals[] = {
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{ WS_NET_DM_CMD_UNSPEC, "Unspecified command" },
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{ WS_NET_DM_CMD_ALERT, "Drop alert (summary)" },
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{ WS_NET_DM_CMD_CONFIG, "Configure drop monitor" },
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{ WS_NET_DM_CMD_START, "Start monitoring" },
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{ WS_NET_DM_CMD_STOP, "Stop monitoring" },
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{ WS_NET_DM_CMD_PACKET_ALERT, "Drop alert (packet)" },
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{ WS_NET_DM_CMD_CONFIG_GET, "Get drop monitor configuration" },
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{ WS_NET_DM_CMD_CONFIG_NEW, "New drop monitor configuration" },
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{ WS_NET_DM_CMD_STATS_GET, "Get drop monitor statistics" },
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{ WS_NET_DM_CMD_STATS_NEW, "New drop monitor statistics" },
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{ 0, NULL },
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};
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static value_string_ext ws_net_dm_commands_vals_ext = VALUE_STRING_EXT_INIT(ws_net_dm_commands_vals);
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static const value_string ws_net_dm_attrs_vals[] = {
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{ WS_NET_DM_ATTR_UNSPEC, "Unspecified" },
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{ WS_NET_DM_ATTR_ALERT_MODE, "Alert mode" },
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{ WS_NET_DM_ATTR_PC, "Drop location (PC)" },
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{ WS_NET_DM_ATTR_SYMBOL, "Drop location (symbol)" },
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{ WS_NET_DM_ATTR_IN_PORT, "Input port" },
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{ WS_NET_DM_ATTR_TIMESTAMP, "Timestamp" },
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{ WS_NET_DM_ATTR_PROTO, "Protocol" },
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{ WS_NET_DM_ATTR_PAYLOAD, "Payload" },
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{ WS_NET_DM_ATTR_PAD, "Pad" },
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{ WS_NET_DM_ATTR_TRUNC_LEN, "Truncation length" },
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{ WS_NET_DM_ATTR_ORIG_LEN, "Original length" },
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{ WS_NET_DM_ATTR_QUEUE_LEN, "Queue length" },
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{ WS_NET_DM_ATTR_STATS, "Software statistics" },
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{ WS_NET_DM_ATTR_HW_STATS, "Hardware statistics" },
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{ WS_NET_DM_ATTR_ORIGIN, "Packet origin" },
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{ WS_NET_DM_ATTR_HW_TRAP_GROUP_NAME, "Hardware trap group name" },
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{ WS_NET_DM_ATTR_HW_TRAP_NAME, "Hardware trap name" },
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{ WS_NET_DM_ATTR_HW_ENTRIES, "Hardware trap entries" },
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{ WS_NET_DM_ATTR_HW_ENTRY, "Hardware trap entry" },
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{ WS_NET_DM_ATTR_HW_TRAP_COUNT, "Hardware trap count" },
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{ WS_NET_DM_ATTR_SW_DROPS, "Software drops" },
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{ WS_NET_DM_ATTR_HW_DROPS, "Hardware drops" },
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2020-01-25 13:28:03 +00:00
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{ WS_NET_DM_ATTR_FLOW_ACTION_COOKIE, "Flow action cookie" },
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2019-07-20 14:19:10 +00:00
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{ 0, NULL },
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};
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static value_string_ext ws_net_dm_attrs_vals_ext = VALUE_STRING_EXT_INIT(ws_net_dm_attrs_vals);
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static const value_string ws_net_dm_attrs_port_vals[] = {
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{ WS_NET_DM_ATTR_PORT_NETDEV_IFINDEX, "Net device index" },
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{ WS_NET_DM_ATTR_PORT_NETDEV_NAME, "Net device name" },
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{ 0, NULL },
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};
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static const value_string ws_net_dm_attrs_stats_vals[] = {
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{ WS_NET_DM_ATTR_STATS_DROPPED, "Dropped" },
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{ 0, NULL },
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};
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static const value_string ws_net_dm_alert_mode_vals[] = {
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{ WS_NET_DM_ALERT_MODE_SUMMARY, "Summary" },
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{ WS_NET_DM_ALERT_MODE_PACKET, "Packet" },
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{ 0, NULL },
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};
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static const value_string ws_net_dm_origin_vals[] = {
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{ WS_NET_DM_ORIGIN_SW, "Software" },
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{ WS_NET_DM_ORIGIN_HW, "Hardware" },
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{ 0, NULL },
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};
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static header_field_info hfi_net_dm_commands NETLINK_NET_DM_HFI_INIT =
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{ "Command", "net_dm.cmd", FT_UINT8, BASE_DEC | BASE_EXT_STRING,
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&ws_net_dm_commands_vals_ext, 0x00, NULL, HFILL };
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static header_field_info hfi_net_dm_attrs NETLINK_NET_DM_HFI_INIT =
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{ "Attribute type", "net_dm.attr_type", FT_UINT16, BASE_DEC | BASE_EXT_STRING,
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&ws_net_dm_attrs_vals_ext, NLA_TYPE_MASK, NULL, HFILL };
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static header_field_info hfi_net_dm_alert_mode NETLINK_NET_DM_HFI_INIT =
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{ "Alert mode", "net_dm.alert_mode", FT_UINT8, BASE_DEC,
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VALS(ws_net_dm_alert_mode_vals), 0x00, NULL, HFILL };
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static header_field_info hfi_net_dm_pc NETLINK_NET_DM_HFI_INIT =
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{ "Program counter", "net_dm.pc", FT_UINT64, BASE_HEX,
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NULL, 0x00, NULL, HFILL };
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static header_field_info hfi_net_dm_symbol NETLINK_NET_DM_HFI_INIT =
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{ "Symbol", "net_dm.symbol", FT_STRINGZ, STR_ASCII,
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NULL, 0x00, NULL, HFILL };
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static header_field_info hfi_net_dm_attrs_port NETLINK_NET_DM_HFI_INIT =
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{ "Attribute type", "net_dm.port.attr_type", FT_UINT16, BASE_DEC,
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VALS(ws_net_dm_attrs_port_vals), NLA_TYPE_MASK, NULL, HFILL };
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static header_field_info hfi_net_dm_timestamp NETLINK_NET_DM_HFI_INIT =
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{ "Timestamp", "net_dm.timestamp", FT_ABSOLUTE_TIME, ABSOLUTE_TIME_LOCAL,
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NULL, 0x00, NULL, HFILL };
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static header_field_info hfi_net_dm_proto NETLINK_NET_DM_HFI_INIT =
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{ "Protocol", "net_dm.proto", FT_UINT16, BASE_HEX,
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NULL, 0x00, NULL, HFILL };
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static header_field_info hfi_net_dm_trunc_len NETLINK_NET_DM_HFI_INIT =
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{ "Truncation length", "net_dm.trunc_len", FT_UINT32, BASE_DEC,
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NULL, 0x00, NULL, HFILL };
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static header_field_info hfi_net_dm_orig_len NETLINK_NET_DM_HFI_INIT =
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{ "Original length", "net_dm.orig_len", FT_UINT32, BASE_DEC,
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NULL, 0x00, NULL, HFILL };
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static header_field_info hfi_net_dm_queue_len NETLINK_NET_DM_HFI_INIT =
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{ "Queue length", "net_dm.queue_len", FT_UINT32, BASE_DEC,
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NULL, 0x00, NULL, HFILL };
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static header_field_info hfi_net_dm_attrs_stats NETLINK_NET_DM_HFI_INIT =
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{ "Attribute type", "net_dm.stats.attr_type", FT_UINT16, BASE_DEC,
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VALS(ws_net_dm_attrs_stats_vals), NLA_TYPE_MASK, NULL, HFILL };
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static header_field_info hfi_net_dm_origin NETLINK_NET_DM_HFI_INIT =
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{ "Packet origin", "net_dm.origin", FT_UINT16, BASE_DEC,
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VALS(ws_net_dm_origin_vals), 0x00, NULL, HFILL };
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static header_field_info hfi_net_dm_hw_trap_group_name NETLINK_NET_DM_HFI_INIT =
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{ "Hardware trap group name", "net_dm.hw_trap_group_name", FT_STRINGZ,
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STR_ASCII, NULL, 0x00, NULL, HFILL };
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static header_field_info hfi_net_dm_hw_trap_name NETLINK_NET_DM_HFI_INIT =
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{ "Hardware trap name", "net_dm.hw_trap_name", FT_STRINGZ,
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STR_ASCII, NULL, 0x00, NULL, HFILL };
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static header_field_info hfi_net_dm_hw_trap_count NETLINK_NET_DM_HFI_INIT =
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{ "Hardware trap count", "net_dm.hw_trap_count", FT_UINT32, BASE_DEC,
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NULL, 0x00, NULL, HFILL };
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static header_field_info hfi_net_dm_sw NETLINK_NET_DM_HFI_INIT =
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{ "Software", "net_dm.sw", FT_NONE, BASE_NONE, NULL, 0x00, NULL,
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HFILL };
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static header_field_info hfi_net_dm_hw NETLINK_NET_DM_HFI_INIT =
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{ "Hardware", "net_dm.hw", FT_NONE, BASE_NONE, NULL, 0x00, NULL,
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HFILL };
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static header_field_info hfi_net_dm_port_netdev_index NETLINK_NET_DM_HFI_INIT =
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{ "Port net device index", "net_dm.port.netdev_index", FT_UINT32, BASE_DEC,
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NULL, 0x00, NULL, HFILL };
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static header_field_info hfi_net_dm_port_netdev_name NETLINK_NET_DM_HFI_INIT =
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{ "Port net device name", "net_dm.port.netdev_name", FT_STRINGZ, STR_ASCII,
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NULL, 0x00, NULL, HFILL };
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static header_field_info hfi_net_dm_stats_dropped NETLINK_NET_DM_HFI_INIT =
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{ "Dropped", "net_dm.stats.dropped", FT_UINT64, BASE_DEC,
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NULL, 0x00, NULL, HFILL };
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2020-01-25 13:28:03 +00:00
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static header_field_info hfi_net_dm_flow_action_cookie NETLINK_NET_DM_HFI_INIT =
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{ "Flow action cookie", "net_dm.cookie", FT_BYTES, BASE_NONE,
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NULL, 0x00, NULL, HFILL };
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2019-07-20 14:19:10 +00:00
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static int
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2020-01-08 21:08:15 +00:00
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dissect_net_dm_attrs_port(tvbuff_t *tvb, void *data _U_, struct packet_netlink_data *nl_data, proto_tree *tree, int nla_type, int offset, int len)
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2019-07-20 14:19:10 +00:00
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{
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enum ws_net_dm_attrs_port type = (enum ws_net_dm_attrs_port) nla_type & NLA_TYPE_MASK;
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const guint8 *str;
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2020-01-11 11:43:53 +00:00
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guint32 value;
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2019-07-20 14:19:10 +00:00
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switch (type) {
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case WS_NET_DM_ATTR_PORT_NETDEV_IFINDEX:
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2020-01-11 11:43:53 +00:00
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proto_tree_add_item_ret_uint(tree, &hfi_net_dm_port_netdev_index, tvb, offset, len, nl_data->encoding, &value);
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proto_item_append_text(tree, ": %u", value);
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2019-07-20 14:19:10 +00:00
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return 1;
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case WS_NET_DM_ATTR_PORT_NETDEV_NAME:
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proto_tree_add_item_ret_string(tree, &hfi_net_dm_port_netdev_name, tvb, offset, len, ENC_ASCII | ENC_NA, wmem_packet_scope(), &str);
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proto_item_append_text(tree, ": %s", str);
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return 1;
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default:
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return 0;
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}
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}
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static int
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2020-01-08 21:08:15 +00:00
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|
|
dissect_net_dm_attrs_stats(tvbuff_t *tvb, void *data _U_, struct packet_netlink_data *nl_data, proto_tree *tree, int nla_type, int offset, int len)
|
2019-07-20 14:19:10 +00:00
|
|
|
{
|
|
|
|
enum ws_net_dm_attrs_port type = (enum ws_net_dm_attrs_port) nla_type & NLA_TYPE_MASK;
|
|
|
|
|
|
|
|
switch (type) {
|
|
|
|
case WS_NET_DM_ATTR_STATS_DROPPED:
|
2020-01-08 21:08:15 +00:00
|
|
|
proto_tree_add_item(tree, &hfi_net_dm_stats_dropped, tvb, offset, len, nl_data->encoding);
|
2019-07-20 14:19:10 +00:00
|
|
|
return 1;
|
|
|
|
default:
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static int
|
2020-01-07 22:02:06 +00:00
|
|
|
dissect_net_dm_attrs(tvbuff_t *tvb, void *data, struct packet_netlink_data *nl_data, proto_tree *tree, int nla_type, int offset, int len)
|
2019-07-20 14:19:10 +00:00
|
|
|
{
|
|
|
|
enum ws_net_dm_attrs type = (enum ws_net_dm_attrs) nla_type & NLA_TYPE_MASK;
|
|
|
|
struct netlink_net_dm_info *info = (struct netlink_net_dm_info *) data;
|
2021-02-07 16:14:35 +00:00
|
|
|
guint64 pc, timestamp;
|
|
|
|
nstime_t ts_nstime;
|
2020-01-11 11:43:53 +00:00
|
|
|
guint32 value;
|
2019-07-20 14:19:10 +00:00
|
|
|
tvbuff_t *next_tvb;
|
|
|
|
const guint8 *str;
|
|
|
|
|
|
|
|
switch (type) {
|
|
|
|
case WS_NET_DM_ATTR_ALERT_MODE:
|
2020-01-08 21:08:15 +00:00
|
|
|
proto_tree_add_item(tree, &hfi_net_dm_alert_mode, tvb, offset, len, nl_data->encoding);
|
2019-07-20 14:19:10 +00:00
|
|
|
return 1;
|
|
|
|
case WS_NET_DM_ATTR_PC:
|
2020-01-10 23:03:39 +00:00
|
|
|
proto_tree_add_item_ret_uint64(tree, &hfi_net_dm_pc, tvb,
|
2020-01-08 21:08:15 +00:00
|
|
|
offset, 8, nl_data->encoding, &pc);
|
2019-07-20 14:19:10 +00:00
|
|
|
proto_item_append_text(tree, ": 0x%" G_GINT64_MODIFIER "x", pc);
|
|
|
|
return 1;
|
|
|
|
case WS_NET_DM_ATTR_SYMBOL:
|
|
|
|
proto_tree_add_item_ret_string(tree, &hfi_net_dm_symbol, tvb, offset, len, ENC_ASCII | ENC_NA, wmem_packet_scope(), &str);
|
|
|
|
proto_item_append_text(tree, ": %s", str);
|
|
|
|
return 1;
|
|
|
|
case WS_NET_DM_ATTR_IN_PORT:
|
2020-01-07 22:02:06 +00:00
|
|
|
return dissect_netlink_attributes(tvb, &hfi_net_dm_attrs_port, ett_net_dm_attrs_in_port, info, nl_data, tree, offset, len,
|
2019-07-20 14:19:10 +00:00
|
|
|
dissect_net_dm_attrs_port);
|
|
|
|
case WS_NET_DM_ATTR_TIMESTAMP:
|
2021-02-07 16:14:35 +00:00
|
|
|
timestamp = tvb_get_guint64(tvb, offset, nl_data->encoding);
|
|
|
|
ts_nstime.secs = timestamp / 1000000000;
|
|
|
|
ts_nstime.nsecs = timestamp % 1000000000;
|
|
|
|
proto_tree_add_time(tree, &hfi_net_dm_timestamp, tvb, offset, 8, &ts_nstime);
|
2019-07-20 14:19:10 +00:00
|
|
|
return 1;
|
|
|
|
case WS_NET_DM_ATTR_PROTO:
|
2020-01-08 21:08:15 +00:00
|
|
|
info->protocol = tvb_get_guint16(tvb, offset, nl_data->encoding);
|
2019-07-20 14:19:10 +00:00
|
|
|
/* This attribute encodes 'skb->protocol' and if it is greater
|
|
|
|
* than or equal to 1536 (0x0600), then it is an Ethertype and
|
|
|
|
* we need to treat the packet as Ethernet.
|
|
|
|
*/
|
|
|
|
if (info->protocol >= 1536 || info->protocol == LINUX_SLL_P_802_2)
|
|
|
|
info->protocol = LINUX_SLL_P_ETHERNET;
|
2020-01-08 21:08:15 +00:00
|
|
|
proto_tree_add_item(tree, &hfi_net_dm_proto, tvb, offset, len, nl_data->encoding);
|
2019-07-20 14:19:10 +00:00
|
|
|
return 1;
|
|
|
|
case WS_NET_DM_ATTR_PAYLOAD:
|
|
|
|
next_tvb = tvb_new_subset_length(tvb, offset, len);
|
|
|
|
if (!dissector_try_uint(sll_ltype_table, info->protocol, next_tvb, info->pinfo, tree))
|
|
|
|
call_data_dissector(next_tvb, info->pinfo, tree);
|
|
|
|
return 1;
|
|
|
|
case WS_NET_DM_ATTR_TRUNC_LEN:
|
2020-01-11 11:43:53 +00:00
|
|
|
proto_tree_add_item_ret_uint(tree, &hfi_net_dm_trunc_len, tvb, offset, len, nl_data->encoding, &value);
|
|
|
|
proto_item_append_text(tree, ": %u", value);
|
2019-07-20 14:19:10 +00:00
|
|
|
return 1;
|
|
|
|
case WS_NET_DM_ATTR_ORIG_LEN:
|
2020-01-11 11:43:53 +00:00
|
|
|
proto_tree_add_item_ret_uint(tree, &hfi_net_dm_orig_len, tvb, offset, len, nl_data->encoding, &value);
|
|
|
|
proto_item_append_text(tree, ": %u", value);
|
2019-07-20 14:19:10 +00:00
|
|
|
return 1;
|
|
|
|
case WS_NET_DM_ATTR_QUEUE_LEN:
|
2020-01-11 11:43:53 +00:00
|
|
|
proto_tree_add_item_ret_uint(tree, &hfi_net_dm_queue_len, tvb, offset, len, nl_data->encoding, &value);
|
|
|
|
proto_item_append_text(tree, ": %u", value);
|
2019-07-20 14:19:10 +00:00
|
|
|
return 1;
|
|
|
|
case WS_NET_DM_ATTR_STATS:
|
2020-01-07 22:02:06 +00:00
|
|
|
return dissect_netlink_attributes(tvb, &hfi_net_dm_attrs_stats, ett_net_dm_attrs_stats, info, nl_data, tree, offset, len,
|
2019-07-20 14:19:10 +00:00
|
|
|
dissect_net_dm_attrs_stats);
|
|
|
|
case WS_NET_DM_ATTR_HW_STATS:
|
2020-01-07 22:02:06 +00:00
|
|
|
return dissect_netlink_attributes(tvb, &hfi_net_dm_attrs_stats, ett_net_dm_attrs_hw_stats, info, nl_data, tree, offset, len,
|
2019-07-20 14:19:10 +00:00
|
|
|
dissect_net_dm_attrs_stats);
|
|
|
|
case WS_NET_DM_ATTR_ORIGIN:
|
2020-01-08 21:08:15 +00:00
|
|
|
proto_tree_add_item(tree, &hfi_net_dm_origin, tvb, offset, len, nl_data->encoding);
|
2019-07-20 14:19:10 +00:00
|
|
|
return 1;
|
|
|
|
case WS_NET_DM_ATTR_HW_TRAP_GROUP_NAME:
|
|
|
|
proto_tree_add_item_ret_string(tree, &hfi_net_dm_hw_trap_group_name, tvb, offset, len, ENC_ASCII | ENC_NA, wmem_packet_scope(), &str);
|
|
|
|
proto_item_append_text(tree, ": %s", str);
|
|
|
|
return 1;
|
|
|
|
case WS_NET_DM_ATTR_HW_TRAP_NAME:
|
|
|
|
proto_tree_add_item_ret_string(tree, &hfi_net_dm_hw_trap_name, tvb, offset, len, ENC_ASCII | ENC_NA, wmem_packet_scope(), &str);
|
|
|
|
proto_item_append_text(tree, ": %s", str);
|
|
|
|
return 1;
|
|
|
|
case WS_NET_DM_ATTR_HW_ENTRIES:
|
2020-01-07 22:02:06 +00:00
|
|
|
return dissect_netlink_attributes(tvb, &hfi_net_dm_attrs, ett_net_dm_attrs_hw_entries, info, nl_data, tree, offset, len,
|
2019-07-20 14:19:10 +00:00
|
|
|
dissect_net_dm_attrs);
|
|
|
|
case WS_NET_DM_ATTR_HW_ENTRY:
|
2020-01-07 22:02:06 +00:00
|
|
|
return dissect_netlink_attributes(tvb, &hfi_net_dm_attrs, ett_net_dm_attrs_hw_entry, info, nl_data, tree, offset, len,
|
2019-07-20 14:19:10 +00:00
|
|
|
dissect_net_dm_attrs);
|
|
|
|
case WS_NET_DM_ATTR_HW_TRAP_COUNT:
|
2020-01-11 11:43:53 +00:00
|
|
|
proto_tree_add_item_ret_uint(tree, &hfi_net_dm_hw_trap_count, tvb, offset, len, nl_data->encoding, &value);
|
|
|
|
proto_item_append_text(tree, ": %u", value);
|
2019-07-20 14:19:10 +00:00
|
|
|
return 1;
|
|
|
|
case WS_NET_DM_ATTR_SW_DROPS:
|
2020-01-08 21:08:15 +00:00
|
|
|
proto_tree_add_item(tree, &hfi_net_dm_sw, tvb, offset, len, nl_data->encoding);
|
2019-07-20 14:19:10 +00:00
|
|
|
return 1;
|
|
|
|
case WS_NET_DM_ATTR_HW_DROPS:
|
2020-01-08 21:08:15 +00:00
|
|
|
proto_tree_add_item(tree, &hfi_net_dm_hw, tvb, offset, len, nl_data->encoding);
|
2019-07-20 14:19:10 +00:00
|
|
|
return 1;
|
2020-01-25 13:28:03 +00:00
|
|
|
case WS_NET_DM_ATTR_FLOW_ACTION_COOKIE:
|
2020-04-28 17:27:28 +00:00
|
|
|
proto_tree_add_item(tree, &hfi_net_dm_flow_action_cookie, tvb, offset, len, ENC_NA);
|
2020-01-25 13:28:03 +00:00
|
|
|
return 1;
|
2019-07-20 14:19:10 +00:00
|
|
|
default:
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static int
|
|
|
|
dissect_netlink_net_dm(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data)
|
|
|
|
{
|
|
|
|
genl_info_t *genl_info = (genl_info_t *)data;
|
|
|
|
struct netlink_net_dm_info info;
|
|
|
|
proto_tree *nlmsg_tree;
|
|
|
|
proto_item *pi;
|
|
|
|
int offset;
|
|
|
|
|
|
|
|
DISSECTOR_ASSERT(genl_info);
|
|
|
|
|
|
|
|
col_set_str(pinfo->cinfo, COL_PROTOCOL, "net_dm");
|
|
|
|
col_clear(pinfo->cinfo, COL_INFO);
|
|
|
|
|
|
|
|
/* Generic netlink header */
|
2020-01-07 22:02:06 +00:00
|
|
|
offset = dissect_genl_header(tvb, genl_info, genl_info->nl_data, &hfi_net_dm_commands);
|
2019-07-20 14:19:10 +00:00
|
|
|
|
|
|
|
/* Not all commands have a payload */
|
|
|
|
if (!tvb_reported_length_remaining(tvb, offset))
|
2020-01-13 21:54:53 +00:00
|
|
|
/* XXX If you do not set the protocol item, you cannot filter on these messages */
|
2019-07-20 14:19:10 +00:00
|
|
|
return offset;
|
|
|
|
|
|
|
|
pi = proto_tree_add_item(tree, proto_registrar_get_nth(proto_netlink_net_dm), tvb, offset, -1, ENC_NA);
|
|
|
|
nlmsg_tree = proto_item_add_subtree(pi, ett_net_dm);
|
|
|
|
|
|
|
|
info.pinfo = pinfo;
|
|
|
|
info.protocol = 0;
|
|
|
|
|
netlink: don't use -1 to mean "to end of packet".
Add dissect_netlink_attributes_to_end(), which takes no length argument,
and uses tvb_ensure_reported_length() to get the remaining length in the
packet.
In dissect_netlink_attributes_common(), treat negative lengths as if
they were a positive length >= 2^31, and throw a reported bounds error.
Also, throw a bounds error if there's more padding to a 4-byte boundary
than there is data in the packet.
At that point, we know the length is positive, so assign it to an
unsigned variable and use *that* in the loop. Throw an error if the
attribute goes past the end of the packet (although we presumably would
have done that already).
(We really should eliminate all use of -1 as "to the end", and make
lengths unsigned. We should also get rid of any places where we're
using negative offsets as offsets from the end of the packet - in the
few cases where you're dealing with trailers, you want to do that
carefully, so as not to throw an exception dissecting the trailer before
you get around to dissecting the rest of the packet - and make offsets
unsigned as well.)
2021-06-15 21:32:54 +00:00
|
|
|
offset = dissect_netlink_attributes_to_end(tvb, &hfi_net_dm_attrs, ett_net_dm_attrs, &info, genl_info->nl_data, nlmsg_tree, offset, dissect_net_dm_attrs);
|
2019-07-20 14:19:10 +00:00
|
|
|
|
|
|
|
return offset;
|
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
proto_register_netlink_net_dm(void)
|
|
|
|
{
|
|
|
|
#ifndef HAVE_HFI_SECTION_INIT
|
|
|
|
static header_field_info *hfi[] = {
|
|
|
|
&hfi_net_dm_commands,
|
|
|
|
&hfi_net_dm_attrs,
|
|
|
|
&hfi_net_dm_alert_mode,
|
|
|
|
&hfi_net_dm_pc,
|
|
|
|
&hfi_net_dm_symbol,
|
|
|
|
&hfi_net_dm_attrs_port,
|
|
|
|
&hfi_net_dm_timestamp,
|
|
|
|
&hfi_net_dm_proto,
|
|
|
|
&hfi_net_dm_trunc_len,
|
|
|
|
&hfi_net_dm_orig_len,
|
|
|
|
&hfi_net_dm_queue_len,
|
|
|
|
&hfi_net_dm_attrs_stats,
|
|
|
|
&hfi_net_dm_origin,
|
|
|
|
&hfi_net_dm_hw_trap_group_name,
|
|
|
|
&hfi_net_dm_hw_trap_name,
|
|
|
|
&hfi_net_dm_hw_trap_count,
|
|
|
|
&hfi_net_dm_sw,
|
|
|
|
&hfi_net_dm_hw,
|
|
|
|
&hfi_net_dm_port_netdev_index,
|
|
|
|
&hfi_net_dm_port_netdev_name,
|
|
|
|
&hfi_net_dm_stats_dropped,
|
2020-01-25 13:28:03 +00:00
|
|
|
&hfi_net_dm_flow_action_cookie,
|
2019-07-20 14:19:10 +00:00
|
|
|
};
|
|
|
|
#endif
|
|
|
|
|
|
|
|
static gint *ett[] = {
|
|
|
|
&ett_net_dm,
|
|
|
|
&ett_net_dm_attrs,
|
|
|
|
&ett_net_dm_attrs_in_port,
|
|
|
|
&ett_net_dm_attrs_stats,
|
|
|
|
&ett_net_dm_attrs_hw_stats,
|
|
|
|
&ett_net_dm_attrs_hw_entries,
|
|
|
|
&ett_net_dm_attrs_hw_entry,
|
|
|
|
};
|
|
|
|
|
|
|
|
proto_netlink_net_dm = proto_register_protocol("Linux net_dm (network drop monitor) protocol", "net_dm", "net_dm");
|
|
|
|
hfi_netlink_net_dm = proto_registrar_get_nth(proto_netlink_net_dm);
|
|
|
|
|
|
|
|
proto_register_fields(proto_netlink_net_dm, hfi, array_length(hfi));
|
|
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
|
|
|
|
|
|
netlink_net_dm_handle = create_dissector_handle(dissect_netlink_net_dm, proto_netlink_net_dm);
|
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
proto_reg_handoff_netlink_net_dm(void)
|
|
|
|
{
|
|
|
|
dissector_add_string("genl.family", "NET_DM", netlink_net_dm_handle);
|
|
|
|
sll_ltype_table = find_dissector_table("sll.ltype");
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Editor modelines - https://www.wireshark.org/tools/modelines.html
|
|
|
|
*
|
|
|
|
* 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:
|
|
|
|
*/
|