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

#include <linux/types.h>

/* Just some random number */
#define TCPDIAG_GETSOCK 18
#define DCCPDIAG_GETSOCK 19

#define INET_DIAG_GETSOCK_MAX 24

/* Socket identity */
struct inet_diag_sockid {
	__be16	idiag_sport;
	__be16	idiag_dport;
	__be32	idiag_src[4];
	__be32	idiag_dst[4];
	__u32	idiag_if;
	__u32	idiag_cookie[2];
#define INET_DIAG_NOCOOKIE (~0U)
};

/* Request structure */

struct inet_diag_req {
	__u8	idiag_family;		/* Family of addresses. */
	__u8	idiag_src_len;
	__u8	idiag_dst_len;
	__u8	idiag_ext;		/* Query extended information */

	struct inet_diag_sockid id;

	__u32	idiag_states;		/* States to dump */
	__u32	idiag_dbs;		/* Tables to dump (NI) */
};

struct inet_diag_req_v2 {
	__u8	sdiag_family;
	__u8	sdiag_protocol;
	__u8	idiag_ext;
	__u8	pad;
	__u32	idiag_states;
	struct inet_diag_sockid id;
};

/*
 * SOCK_RAW sockets require the underlied protocol to be
 * additionally specified so we can use @pad member for
 * this, but we can't rename it because userspace programs
 * still may depend on this name. Instead lets use another
 * structure definition as an alias for struct
 * @inet_diag_req_v2.
 */
struct inet_diag_req_raw {
	__u8	sdiag_family;
	__u8	sdiag_protocol;
	__u8	idiag_ext;
	__u8	sdiag_raw_protocol;
	__u32	idiag_states;
	struct inet_diag_sockid id;
};

enum {
	INET_DIAG_REQ_NONE,
	INET_DIAG_REQ_BYTECODE,
	INET_DIAG_REQ_SK_BPF_STORAGES,
	INET_DIAG_REQ_PROTOCOL,
	__INET_DIAG_REQ_MAX,
};

#define INET_DIAG_REQ_MAX (__INET_DIAG_REQ_MAX - 1)

/* Bytecode is sequence of 4 byte commands followed by variable arguments.
 * All the commands identified by "code" are conditional jumps forward:
 * to offset cc+"yes" or to offset cc+"no". "yes" is supposed to be
 * length of the command and its arguments.
 */
 
struct inet_diag_bc_op {
	unsigned char	code;
	unsigned char	yes;
	unsigned short	no;
};

enum {
	INET_DIAG_BC_NOP,
	INET_DIAG_BC_JMP,
	INET_DIAG_BC_S_GE,
	INET_DIAG_BC_S_LE,
	INET_DIAG_BC_D_GE,
	INET_DIAG_BC_D_LE,
	INET_DIAG_BC_AUTO,
	INET_DIAG_BC_S_COND,
	INET_DIAG_BC_D_COND,
	INET_DIAG_BC_DEV_COND,   /* u32 ifindex */
	INET_DIAG_BC_MARK_COND,
	INET_DIAG_BC_S_EQ,
	INET_DIAG_BC_D_EQ,
	INET_DIAG_BC_CGROUP_COND,   /* u64 cgroup v2 ID */
};

struct inet_diag_hostcond {
	__u8	family;
	__u8	prefix_len;
	int	port;
	__be32	addr[0];
};

struct inet_diag_markcond {
	__u32 mark;
	__u32 mask;
};

/* Base info structure. It contains socket identity (addrs/ports/cookie)
 * and, alas, the information shown by netstat. */
struct inet_diag_msg {
	__u8	idiag_family;
	__u8	idiag_state;
	__u8	idiag_timer;
	__u8	idiag_retrans;

	struct inet_diag_sockid id;

	__u32	idiag_expires;
	__u32	idiag_rqueue;
	__u32	idiag_wqueue;
	__u32	idiag_uid;
	__u32	idiag_inode;
};

/* Extensions */

enum {
	INET_DIAG_NONE,
	INET_DIAG_MEMINFO,
	INET_DIAG_INFO,
	INET_DIAG_VEGASINFO,
	INET_DIAG_CONG,
	INET_DIAG_TOS,
	INET_DIAG_TCLASS,
	INET_DIAG_SKMEMINFO,
	INET_DIAG_SHUTDOWN,

	/*
	 * Next extenstions cannot be requested in struct inet_diag_req_v2:
	 * its field idiag_ext has only 8 bits.
	 */

	INET_DIAG_DCTCPINFO,	/* request as INET_DIAG_VEGASINFO */
	INET_DIAG_PROTOCOL,	/* response attribute only */
	INET_DIAG_SKV6ONLY,
	INET_DIAG_LOCALS,
	INET_DIAG_PEERS,
	INET_DIAG_PAD,
	INET_DIAG_MARK,		/* only with CAP_NET_ADMIN */
	INET_DIAG_BBRINFO,	/* request as INET_DIAG_VEGASINFO */
	INET_DIAG_CLASS_ID,	/* request as INET_DIAG_TCLASS */
	INET_DIAG_MD5SIG,
	INET_DIAG_ULP_INFO,
	INET_DIAG_SK_BPF_STORAGES,
	INET_DIAG_CGROUP_ID,
	INET_DIAG_SOCKOPT,
	__INET_DIAG_MAX,
};

#define INET_DIAG_MAX (__INET_DIAG_MAX - 1)

enum {
	INET_ULP_INFO_UNSPEC,
	INET_ULP_INFO_NAME,
	INET_ULP_INFO_TLS,
	INET_ULP_INFO_MPTCP,
	__INET_ULP_INFO_MAX,
};
#define INET_ULP_INFO_MAX (__INET_ULP_INFO_MAX - 1)

/* INET_DIAG_MEM */

struct inet_diag_meminfo {
	__u32	idiag_rmem;
	__u32	idiag_wmem;
	__u32	idiag_fmem;
	__u32	idiag_tmem;
};

/* INET_DIAG_SOCKOPT */

struct inet_diag_sockopt {
	__u8	recverr:1,
		is_icsk:1,
		freebind:1,
		hdrincl:1,
		mc_loop:1,
		transparent:1,
		mc_all:1,
		nodefrag:1;
	__u8	bind_address_no_port:1,
		recverr_rfc4884:1,
		defer_connect:1,
		unused:5;
};

/* INET_DIAG_VEGASINFO */

struct tcpvegas_info {
	__u32	tcpv_enabled;
	__u32	tcpv_rttcnt;
	__u32	tcpv_rtt;
	__u32	tcpv_minrtt;
};

/* INET_DIAG_DCTCPINFO */

struct tcp_dctcp_info {
	__u16	dctcp_enabled;
	__u16	dctcp_ce_state;
	__u32	dctcp_alpha;
	__u32	dctcp_ab_ecn;
	__u32	dctcp_ab_tot;
};

/* INET_DIAG_BBRINFO */

struct tcp_bbr_info {
	/* u64 bw: max-filtered BW (app throughput) estimate in Byte per sec: */
	__u32	bbr_bw_lo;		/* lower 32 bits of bw */
	__u32	bbr_bw_hi;		/* upper 32 bits of bw */
	__u32	bbr_min_rtt;		/* min-filtered RTT in uSec */
	__u32	bbr_pacing_gain;	/* pacing gain shifted left 8 bits */
	__u32	bbr_cwnd_gain;		/* cwnd gain shifted left 8 bits */
};

union tcp_cc_info {
	struct tcpvegas_info	vegas;
	struct tcp_dctcp_info	dctcp;
	struct tcp_bbr_info	bbr;
};
#endif /* _INET_DIAG_H_ */