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|
/* packet-netlink-net_dm.c
* Routines for netlink-net_dm dissection
* Based on netlink-route and netlink-generic dissectors
* Copyright 2019, Mellanox Technologies Ltd.
* Code by Ido Schimmel <idosch@mellanox.com>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
/* net_dm (network drop monitor) is a netlink-based protocol via which alerts
* about dropped packets are sent to user space
*
* Relevant Linux kernel header file:
* include/uapi/linux/net_dropmon.h
*
* Man page:
* man 1 dropwatch
*/
#define HFI_DECLS /* for checkAPIs.pl */
#include "config.h"
#include <epan/packet.h>
#include "packet-netlink.h"
#include "packet-sll.h"
void proto_register_netlink_net_dm(void);
void proto_reg_handoff_netlink_net_dm(void);
enum ws_net_dm_commands {
WS_NET_DM_CMD_UNSPEC,
WS_NET_DM_CMD_ALERT,
WS_NET_DM_CMD_CONFIG,
WS_NET_DM_CMD_START,
WS_NET_DM_CMD_STOP,
WS_NET_DM_CMD_PACKET_ALERT,
WS_NET_DM_CMD_CONFIG_GET,
WS_NET_DM_CMD_CONFIG_NEW,
WS_NET_DM_CMD_STATS_GET,
WS_NET_DM_CMD_STATS_NEW,
};
enum ws_net_dm_attrs {
WS_NET_DM_ATTR_UNSPEC,
WS_NET_DM_ATTR_ALERT_MODE,
WS_NET_DM_ATTR_PC,
WS_NET_DM_ATTR_SYMBOL,
WS_NET_DM_ATTR_IN_PORT,
WS_NET_DM_ATTR_TIMESTAMP,
WS_NET_DM_ATTR_PROTO,
WS_NET_DM_ATTR_PAYLOAD,
WS_NET_DM_ATTR_PAD,
WS_NET_DM_ATTR_TRUNC_LEN,
WS_NET_DM_ATTR_ORIG_LEN,
WS_NET_DM_ATTR_QUEUE_LEN,
WS_NET_DM_ATTR_STATS,
WS_NET_DM_ATTR_HW_STATS,
WS_NET_DM_ATTR_ORIGIN,
WS_NET_DM_ATTR_HW_TRAP_GROUP_NAME,
WS_NET_DM_ATTR_HW_TRAP_NAME,
WS_NET_DM_ATTR_HW_ENTRIES,
WS_NET_DM_ATTR_HW_ENTRY,
WS_NET_DM_ATTR_HW_TRAP_COUNT,
WS_NET_DM_ATTR_SW_DROPS,
WS_NET_DM_ATTR_HW_DROPS,
WS_NET_DM_ATTR_FLOW_ACTION_COOKIE,
};
enum ws_net_dm_attrs_port {
WS_NET_DM_ATTR_PORT_NETDEV_IFINDEX,
WS_NET_DM_ATTR_PORT_NETDEV_NAME,
};
enum ws_net_dm_attrs_stats {
WS_NET_DM_ATTR_STATS_DROPPED,
};
enum ws_net_dm_alert_mode {
WS_NET_DM_ALERT_MODE_SUMMARY,
WS_NET_DM_ALERT_MODE_PACKET,
};
enum ws_net_dm_origin {
WS_NET_DM_ORIGIN_SW,
WS_NET_DM_ORIGIN_HW,
};
struct netlink_net_dm_info {
packet_info *pinfo;
guint16 protocol; /* protocol for packet payload */
};
static int proto_netlink_net_dm = -1;
static dissector_handle_t netlink_net_dm_handle;
static dissector_table_t sll_ltype_table;
static header_field_info *hfi_netlink_net_dm = NULL;
static gint ett_net_dm = -1;
static gint ett_net_dm_attrs = -1;
static gint ett_net_dm_attrs_in_port = -1;
static gint ett_net_dm_attrs_stats = -1;
static gint ett_net_dm_attrs_hw_stats = -1;
static gint ett_net_dm_attrs_hw_entries = -1;
static gint ett_net_dm_attrs_hw_entry = -1;
static const value_string ws_net_dm_commands_vals[] = {
{ WS_NET_DM_CMD_UNSPEC, "Unspecified command" },
{ WS_NET_DM_CMD_ALERT, "Drop alert (summary)" },
{ WS_NET_DM_CMD_CONFIG, "Configure drop monitor" },
{ WS_NET_DM_CMD_START, "Start monitoring" },
{ WS_NET_DM_CMD_STOP, "Stop monitoring" },
{ WS_NET_DM_CMD_PACKET_ALERT, "Drop alert (packet)" },
{ WS_NET_DM_CMD_CONFIG_GET, "Get drop monitor configuration" },
{ WS_NET_DM_CMD_CONFIG_NEW, "New drop monitor configuration" },
{ WS_NET_DM_CMD_STATS_GET, "Get drop monitor statistics" },
{ WS_NET_DM_CMD_STATS_NEW, "New drop monitor statistics" },
{ 0, NULL },
};
static value_string_ext ws_net_dm_commands_vals_ext = VALUE_STRING_EXT_INIT(ws_net_dm_commands_vals);
static const value_string ws_net_dm_attrs_vals[] = {
{ WS_NET_DM_ATTR_UNSPEC, "Unspecified" },
{ WS_NET_DM_ATTR_ALERT_MODE, "Alert mode" },
{ WS_NET_DM_ATTR_PC, "Drop location (PC)" },
{ WS_NET_DM_ATTR_SYMBOL, "Drop location (symbol)" },
{ WS_NET_DM_ATTR_IN_PORT, "Input port" },
{ WS_NET_DM_ATTR_TIMESTAMP, "Timestamp" },
{ WS_NET_DM_ATTR_PROTO, "Protocol" },
{ WS_NET_DM_ATTR_PAYLOAD, "Payload" },
{ WS_NET_DM_ATTR_PAD, "Pad" },
{ WS_NET_DM_ATTR_TRUNC_LEN, "Truncation length" },
{ WS_NET_DM_ATTR_ORIG_LEN, "Original length" },
{ WS_NET_DM_ATTR_QUEUE_LEN, "Queue length" },
{ WS_NET_DM_ATTR_STATS, "Software statistics" },
{ WS_NET_DM_ATTR_HW_STATS, "Hardware statistics" },
{ WS_NET_DM_ATTR_ORIGIN, "Packet origin" },
{ WS_NET_DM_ATTR_HW_TRAP_GROUP_NAME, "Hardware trap group name" },
{ WS_NET_DM_ATTR_HW_TRAP_NAME, "Hardware trap name" },
{ WS_NET_DM_ATTR_HW_ENTRIES, "Hardware trap entries" },
{ WS_NET_DM_ATTR_HW_ENTRY, "Hardware trap entry" },
{ WS_NET_DM_ATTR_HW_TRAP_COUNT, "Hardware trap count" },
{ WS_NET_DM_ATTR_SW_DROPS, "Software drops" },
{ WS_NET_DM_ATTR_HW_DROPS, "Hardware drops" },
{ WS_NET_DM_ATTR_FLOW_ACTION_COOKIE, "Flow action cookie" },
{ 0, NULL },
};
static value_string_ext ws_net_dm_attrs_vals_ext = VALUE_STRING_EXT_INIT(ws_net_dm_attrs_vals);
static const value_string ws_net_dm_attrs_port_vals[] = {
{ WS_NET_DM_ATTR_PORT_NETDEV_IFINDEX, "Net device index" },
{ WS_NET_DM_ATTR_PORT_NETDEV_NAME, "Net device name" },
{ 0, NULL },
};
static const value_string ws_net_dm_attrs_stats_vals[] = {
{ WS_NET_DM_ATTR_STATS_DROPPED, "Dropped" },
{ 0, NULL },
};
static const value_string ws_net_dm_alert_mode_vals[] = {
{ WS_NET_DM_ALERT_MODE_SUMMARY, "Summary" },
{ WS_NET_DM_ALERT_MODE_PACKET, "Packet" },
{ 0, NULL },
};
static const value_string ws_net_dm_origin_vals[] = {
{ WS_NET_DM_ORIGIN_SW, "Software" },
{ WS_NET_DM_ORIGIN_HW, "Hardware" },
{ 0, NULL },
};
static header_field_info hfi_net_dm_commands =
{ "Command", "net_dm.cmd", FT_UINT8, BASE_DEC | BASE_EXT_STRING,
&ws_net_dm_commands_vals_ext, 0x00, NULL, HFILL };
static header_field_info hfi_net_dm_attrs =
{ "Attribute type", "net_dm.attr_type", FT_UINT16, BASE_DEC | BASE_EXT_STRING,
&ws_net_dm_attrs_vals_ext, NLA_TYPE_MASK, NULL, HFILL };
static header_field_info hfi_net_dm_alert_mode =
{ "Alert mode", "net_dm.alert_mode", FT_UINT8, BASE_DEC,
VALS(ws_net_dm_alert_mode_vals), 0x00, NULL, HFILL };
static header_field_info hfi_net_dm_pc =
{ "Program counter", "net_dm.pc", FT_UINT64, BASE_HEX,
NULL, 0x00, NULL, HFILL };
static header_field_info hfi_net_dm_symbol =
{ "Symbol", "net_dm.symbol", FT_STRINGZ, BASE_NONE,
NULL, 0x00, NULL, HFILL };
static header_field_info hfi_net_dm_attrs_port =
{ "Attribute type", "net_dm.port.attr_type", FT_UINT16, BASE_DEC,
VALS(ws_net_dm_attrs_port_vals), NLA_TYPE_MASK, NULL, HFILL };
static header_field_info hfi_net_dm_timestamp =
{ "Timestamp", "net_dm.timestamp", FT_ABSOLUTE_TIME, ABSOLUTE_TIME_LOCAL,
NULL, 0x00, NULL, HFILL };
static header_field_info hfi_net_dm_proto =
{ "Protocol", "net_dm.proto", FT_UINT16, BASE_HEX,
NULL, 0x00, NULL, HFILL };
static header_field_info hfi_net_dm_trunc_len =
{ "Truncation length", "net_dm.trunc_len", FT_UINT32, BASE_DEC,
NULL, 0x00, NULL, HFILL };
static header_field_info hfi_net_dm_orig_len =
{ "Original length", "net_dm.orig_len", FT_UINT32, BASE_DEC,
NULL, 0x00, NULL, HFILL };
static header_field_info hfi_net_dm_queue_len =
{ "Queue length", "net_dm.queue_len", FT_UINT32, BASE_DEC,
NULL, 0x00, NULL, HFILL };
static header_field_info hfi_net_dm_attrs_stats =
{ "Attribute type", "net_dm.stats.attr_type", FT_UINT16, BASE_DEC,
VALS(ws_net_dm_attrs_stats_vals), NLA_TYPE_MASK, NULL, HFILL };
static header_field_info hfi_net_dm_origin =
{ "Packet origin", "net_dm.origin", FT_UINT16, BASE_DEC,
VALS(ws_net_dm_origin_vals), 0x00, NULL, HFILL };
static header_field_info hfi_net_dm_hw_trap_group_name =
{ "Hardware trap group name", "net_dm.hw_trap_group_name", FT_STRINGZ,
BASE_NONE, NULL, 0x00, NULL, HFILL };
static header_field_info hfi_net_dm_hw_trap_name =
{ "Hardware trap name", "net_dm.hw_trap_name", FT_STRINGZ,
BASE_NONE, NULL, 0x00, NULL, HFILL };
static header_field_info hfi_net_dm_hw_trap_count =
{ "Hardware trap count", "net_dm.hw_trap_count", FT_UINT32, BASE_DEC,
NULL, 0x00, NULL, HFILL };
static header_field_info hfi_net_dm_sw =
{ "Software", "net_dm.sw", FT_NONE, BASE_NONE, NULL, 0x00, NULL,
HFILL };
static header_field_info hfi_net_dm_hw =
{ "Hardware", "net_dm.hw", FT_NONE, BASE_NONE, NULL, 0x00, NULL,
HFILL };
static header_field_info hfi_net_dm_port_netdev_index =
{ "Port net device index", "net_dm.port.netdev_index", FT_UINT32, BASE_DEC,
NULL, 0x00, NULL, HFILL };
static header_field_info hfi_net_dm_port_netdev_name =
{ "Port net device name", "net_dm.port.netdev_name", FT_STRINGZ, BASE_NONE,
NULL, 0x00, NULL, HFILL };
static header_field_info hfi_net_dm_stats_dropped =
{ "Dropped", "net_dm.stats.dropped", FT_UINT64, BASE_DEC,
NULL, 0x00, NULL, HFILL };
static header_field_info hfi_net_dm_flow_action_cookie =
{ "Flow action cookie", "net_dm.cookie", FT_BYTES, BASE_NONE,
NULL, 0x00, NULL, HFILL };
static int
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)
{
enum ws_net_dm_attrs_port type = (enum ws_net_dm_attrs_port) nla_type & NLA_TYPE_MASK;
const guint8 *str;
guint32 value;
switch (type) {
case WS_NET_DM_ATTR_PORT_NETDEV_IFINDEX:
proto_tree_add_item_ret_uint(tree, hfi_net_dm_port_netdev_index.id, tvb, offset, len, nl_data->encoding, &value);
proto_item_append_text(tree, ": %u", value);
return 1;
case WS_NET_DM_ATTR_PORT_NETDEV_NAME:
proto_tree_add_item_ret_string(tree, hfi_net_dm_port_netdev_name.id, tvb, offset, len, ENC_ASCII | ENC_NA, wmem_packet_scope(), &str);
proto_item_append_text(tree, ": %s", str);
return 1;
default:
return 0;
}
}
static int
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)
{
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:
proto_tree_add_item(tree, hfi_net_dm_stats_dropped.id, tvb, offset, len, nl_data->encoding);
return 1;
default:
return 0;
}
}
static int
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)
{
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;
guint64 pc, timestamp;
nstime_t ts_nstime;
guint32 value;
tvbuff_t *next_tvb;
const guint8 *str;
switch (type) {
case WS_NET_DM_ATTR_ALERT_MODE:
proto_tree_add_item(tree, hfi_net_dm_alert_mode.id, tvb, offset, len, nl_data->encoding);
return 1;
case WS_NET_DM_ATTR_PC:
proto_tree_add_item_ret_uint64(tree, hfi_net_dm_pc.id, tvb,
offset, 8, nl_data->encoding, &pc);
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.id, 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:
return dissect_netlink_attributes(tvb, hfi_net_dm_attrs_port.id, ett_net_dm_attrs_in_port, info, nl_data, tree, offset, len,
dissect_net_dm_attrs_port);
case WS_NET_DM_ATTR_TIMESTAMP:
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.id, tvb, offset, 8, &ts_nstime);
return 1;
case WS_NET_DM_ATTR_PROTO:
info->protocol = tvb_get_guint16(tvb, offset, nl_data->encoding);
/* 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;
proto_tree_add_item(tree, hfi_net_dm_proto.id, tvb, offset, len, nl_data->encoding);
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:
proto_tree_add_item_ret_uint(tree, hfi_net_dm_trunc_len.id, tvb, offset, len, nl_data->encoding, &value);
proto_item_append_text(tree, ": %u", value);
return 1;
case WS_NET_DM_ATTR_ORIG_LEN:
proto_tree_add_item_ret_uint(tree, hfi_net_dm_orig_len.id, tvb, offset, len, nl_data->encoding, &value);
proto_item_append_text(tree, ": %u", value);
return 1;
case WS_NET_DM_ATTR_QUEUE_LEN:
proto_tree_add_item_ret_uint(tree, hfi_net_dm_queue_len.id, tvb, offset, len, nl_data->encoding, &value);
proto_item_append_text(tree, ": %u", value);
return 1;
case WS_NET_DM_ATTR_STATS:
return dissect_netlink_attributes(tvb, hfi_net_dm_attrs_stats.id, ett_net_dm_attrs_stats, info, nl_data, tree, offset, len,
dissect_net_dm_attrs_stats);
case WS_NET_DM_ATTR_HW_STATS:
return dissect_netlink_attributes(tvb, hfi_net_dm_attrs_stats.id, ett_net_dm_attrs_hw_stats, info, nl_data, tree, offset, len,
dissect_net_dm_attrs_stats);
case WS_NET_DM_ATTR_ORIGIN:
proto_tree_add_item(tree, hfi_net_dm_origin.id, tvb, offset, len, nl_data->encoding);
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.id, 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.id, 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:
return dissect_netlink_attributes(tvb, hfi_net_dm_attrs.id, ett_net_dm_attrs_hw_entries, info, nl_data, tree, offset, len,
dissect_net_dm_attrs);
case WS_NET_DM_ATTR_HW_ENTRY:
return dissect_netlink_attributes(tvb, hfi_net_dm_attrs.id, ett_net_dm_attrs_hw_entry, info, nl_data, tree, offset, len,
dissect_net_dm_attrs);
case WS_NET_DM_ATTR_HW_TRAP_COUNT:
proto_tree_add_item_ret_uint(tree, hfi_net_dm_hw_trap_count.id, tvb, offset, len, nl_data->encoding, &value);
proto_item_append_text(tree, ": %u", value);
return 1;
case WS_NET_DM_ATTR_SW_DROPS:
proto_tree_add_item(tree, hfi_net_dm_sw.id, tvb, offset, len, nl_data->encoding);
return 1;
case WS_NET_DM_ATTR_HW_DROPS:
proto_tree_add_item(tree, hfi_net_dm_hw.id, tvb, offset, len, nl_data->encoding);
return 1;
case WS_NET_DM_ATTR_FLOW_ACTION_COOKIE:
proto_tree_add_item(tree, hfi_net_dm_flow_action_cookie.id, tvb, offset, len, ENC_NA);
return 1;
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 */
offset = dissect_genl_header(tvb, genl_info, genl_info->nl_data, hfi_net_dm_commands.id);
/* Not all commands have a payload */
if (!tvb_reported_length_remaining(tvb, offset))
/* XXX If you do not set the protocol item, you cannot filter on these messages */
return offset;
pi = proto_tree_add_item(tree, 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;
offset = dissect_netlink_attributes_to_end(tvb, hfi_net_dm_attrs.id, ett_net_dm_attrs, &info, genl_info->nl_data, nlmsg_tree, offset, dissect_net_dm_attrs);
return offset;
}
void
proto_register_netlink_net_dm(void)
{
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,
&hfi_net_dm_flow_action_cookie,
};
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_manual(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:
*/
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