✏ EDIT: net_dropmon.h

/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
#ifndef __NET_DROPMON_H
#define __NET_DROPMON_H

#include <linux/types.h>
#include <linux/netlink.h>

struct net_dm_drop_point {
	__u8 pc[8];
	__u32 count;
};

#define is_drop_point_hw(x) do {\
	int ____i, ____j;\
	for (____i = 0; ____i < 8; i ____i++)\
		____j |= x[____i];\
	____j;\
} while (0)

#define NET_DM_CFG_VERSION  0
#define NET_DM_CFG_ALERT_COUNT  1
#define NET_DM_CFG_ALERT_DELAY 2
#define NET_DM_CFG_MAX 3

struct net_dm_config_entry {
	__u32 type;
	__u64 data __attribute__((aligned(8)));
};

struct net_dm_config_msg {
	__u32 entries;
	struct net_dm_config_entry options[0];
};

struct net_dm_alert_msg {
	__u32 entries;
	struct net_dm_drop_point points[0];
};

struct net_dm_user_msg {
	union {
		struct net_dm_config_msg user;
		struct net_dm_alert_msg alert;
	} u;
};

/* These are the netlink message types for this protocol */

enum {
	NET_DM_CMD_UNSPEC = 0,
	NET_DM_CMD_ALERT,
	NET_DM_CMD_CONFIG,
	NET_DM_CMD_START,
	NET_DM_CMD_STOP,
	NET_DM_CMD_PACKET_ALERT,
	NET_DM_CMD_CONFIG_GET,
	NET_DM_CMD_CONFIG_NEW,
	NET_DM_CMD_STATS_GET,
	NET_DM_CMD_STATS_NEW,
	_NET_DM_CMD_MAX,
};

#define NET_DM_CMD_MAX (_NET_DM_CMD_MAX - 1)

/*
 * Our group identifiers
 */
#define NET_DM_GRP_ALERT 1

enum net_dm_attr {
	NET_DM_ATTR_UNSPEC,

NET_DM_ATTR_ALERT_MODE,			/* u8 */
	NET_DM_ATTR_PC,				/* u64 */
	NET_DM_ATTR_SYMBOL,			/* string */
	NET_DM_ATTR_IN_PORT,			/* nested */
	NET_DM_ATTR_TIMESTAMP,			/* u64 */
	NET_DM_ATTR_PROTO,			/* u16 */
	NET_DM_ATTR_PAYLOAD,			/* binary */
	NET_DM_ATTR_PAD,
	NET_DM_ATTR_TRUNC_LEN,			/* u32 */
	NET_DM_ATTR_ORIG_LEN,			/* u32 */
	NET_DM_ATTR_QUEUE_LEN,			/* u32 */
	NET_DM_ATTR_STATS,			/* nested */
	NET_DM_ATTR_HW_STATS,			/* nested */
	NET_DM_ATTR_ORIGIN,			/* u16 */
	NET_DM_ATTR_HW_TRAP_GROUP_NAME,		/* string */
	NET_DM_ATTR_HW_TRAP_NAME,		/* string */
	NET_DM_ATTR_HW_ENTRIES,			/* nested */
	NET_DM_ATTR_HW_ENTRY,			/* nested */
	NET_DM_ATTR_HW_TRAP_COUNT,		/* u32 */
	NET_DM_ATTR_SW_DROPS,			/* flag */
	NET_DM_ATTR_HW_DROPS,			/* flag */
	NET_DM_ATTR_FLOW_ACTION_COOKIE,		/* binary */
	NET_DM_ATTR_REASON,			/* string */

__NET_DM_ATTR_MAX,
	NET_DM_ATTR_MAX = __NET_DM_ATTR_MAX - 1
};

/**
 * enum net_dm_alert_mode - Alert mode.
 * @NET_DM_ALERT_MODE_SUMMARY: A summary of recent drops is sent to user space.
 * @NET_DM_ALERT_MODE_PACKET: Each dropped packet is sent to user space along
 *                            with metadata.
 */
enum net_dm_alert_mode {
	NET_DM_ALERT_MODE_SUMMARY,
	NET_DM_ALERT_MODE_PACKET,
};

enum {
	NET_DM_ATTR_PORT_NETDEV_IFINDEX,	/* u32 */
	NET_DM_ATTR_PORT_NETDEV_NAME,		/* string */

__NET_DM_ATTR_PORT_MAX,
	NET_DM_ATTR_PORT_MAX = __NET_DM_ATTR_PORT_MAX - 1
};

enum {
	NET_DM_ATTR_STATS_DROPPED,		/* u64 */

__NET_DM_ATTR_STATS_MAX,
	NET_DM_ATTR_STATS_MAX = __NET_DM_ATTR_STATS_MAX - 1
};

enum net_dm_origin {
	NET_DM_ORIGIN_SW,
	NET_DM_ORIGIN_HW,
};

#endif

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