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     )€ЙИ„o4пЗАК =з    )/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_SOCKET_H
#define _LINUX_SOCKET_H


#include <asm/socket.h>			/* arch-dependent defines	*/
#include <linux/sockios.h>		/* the SIOCxxx I/O controls	*/
#include <linux/uio.h>			/* iovec support		*/
#include <linux/types.h>		/* pid_t			*/
#include <linux/compiler.h>		/* __user			*/
#include <uapi/linux/socket.h>

struct file;
struct pid;
struct cred;
struct socket;
struct sock;
struct sk_buff;
struct proto_accept_arg;

#define __sockaddr_check_size(size)	\
	BUILD_BUG_ON(((size) > sizeof(struct __kernel_sockaddr_storage)))

#ifdef CONFIG_PROC_FS
struct seq_file;
extern void socket_seq_show(struct seq_file *seq);
#endif

typedef __kernel_sa_family_t	sa_family_t;

/*
 *	1003.1g requires sa_family_t and that sa_data is char.
 */

struct sockaddr {
	sa_family_t	sa_family;	/* address family, AF_xxx	*/
	char		sa_data[14];	/* 14 bytes of protocol address	*/
};

struct linger {
	int		l_onoff;	/* Linger active		*/
	int		l_linger;	/* How long to linger for	*/
};

#define sockaddr_storage __kernel_sockaddr_storage

/*
 *	As we do 4.4BSD message passing we use a 4.4BSD message passing
 *	system, not 4.3. Thus msg_accrights(len) are now missing. They
 *	belong in an obscure libc emulation or the bin.
 */

struct msghdr {
	void		*msg_name;	/* ptr to socket address structure */
	int		msg_namelen;	/* size of socket address structure */

	int		msg_inq;	/* output, data left in socket */

	struct iov_iter	msg_iter;	/* data */

	/*
	 * Ancillary data. msg_control_user is the user buffer used for the
	 * recv* side when msg_control_is_user is set, msg_control is the kernel
	 * buffer used for all other cases.
	 */
	union {
		void		*msg_control;
		void __user	*msg_control_user;
	};
	bool		msg_control_is_user : 1;
	bool		msg_get_inq : 1;/* return INQ after receive */
	unsigned int	msg_flags;	/* flags on received message */
	__kernel_size_t	msg_controllen;	/* ancillary data buffer length */
	struct kiocb	*msg_iocb;	/* ptr to iocb for async requests */
	struct ubuf_info *msg_ubuf;
	int (*sg_from_iter)(struct sk_buff *skb,
			    struct iov_iter *from, size_t length);
};

struct user_msghdr {
	void		__user *msg_name;	/* ptr to socket address structure */
	int		msg_namelen;		/* size of socket address structure */
	struct iovec	__user *msg_iov;	/* scatter/gather array */
	__kernel_size_t	msg_iovlen;		/* # elements in msg_iov */
	void		__user *msg_control;	/* ancillary data */
	__kernel_size_t	msg_controllen;		/* ancillary data buffer length */
	unsigned int	msg_flags;		/* flags on received message */
};

/* For recvmmsg/sendmmsg */
struct mmsghdr {
	struct user_msghdr  msg_hdr;
	unsigned int        msg_len;
};

/*
 *	POSIX 1003.1g - ancillary data object information
 *	Ancillary data consists of a sequence of pairs of
 *	(cmsghdr, cmsg_data[])
 */

struct cmsghdr {
	__kernel_size_t	cmsg_len;	/* data byte count, including hdr */
        int		cmsg_level;	/* originating protocol */
        int		cmsg_type;	/* protocol-specific type */
};

/*
 *	Ancillary data object information MACROS
 *	Table 5-14 of POSIX 1003.1g
 */

#define __CMSG_NXTHDR(ctl, len, cmsg) __cmsg_nxthdr((ctl),(len),(cmsg))
#define CMSG_NXTHDR(mhdr, cmsg) cmsg_nxthdr((mhdr), (cmsg))

#define CMSG_ALIGN(len) ( ((len)+sizeof(long)-1) & ~(sizeof(long)-1) )

#define CMSG_DATA(cmsg) \
	((void *)(cmsg) + sizeof(struct cmsghdr))
#define CMSG_USER_DATA(cmsg) \
	((void __user *)(cmsg) + sizeof(struct cmsghdr))
#define CMSG_SPACE(len) (sizeof(struct cmsghdr) + CMSG_ALIGN(len))
#define CMSG_LEN(len) (sizeof(struct cmsghdr) + (len))

#define __CMSG_FIRSTHDR(ctl,len) ((len) >= sizeof(struct cmsghdr) ? \
				  (struct cmsghdr *)(ctl) : \
				  (struct cmsghdr *)NULL)
#define CMSG_FIRSTHDR(msg)	__CMSG_FIRSTHDR((msg)->msg_control, (msg)->msg_controllen)
#define CMSG_OK(mhdr, cmsg) ((cmsg)->cmsg_len >= sizeof(struct cmsghdr) && \
			     (cmsg)->cmsg_len <= (unsigned long) \
			     ((mhdr)->msg_controllen - \
			      ((char *)(cmsg) - (char *)(mhdr)->msg_control)))
#define for_each_cmsghdr(cmsg, msg) \
	for (cmsg = CMSG