[linux-block.git] / include / linux / net.h

/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 * NET		An implementation of the SOCKET network access protocol.
 *		This is the master header file for the Linux NET layer,
 *		or, in plain English: the networking handling part of the
 *		kernel.
 *
 * Version:	@(#)net.h	1.0.3	05/25/93
 *
 * Authors:	Orest Zborowski, <obz@Kodak.COM>
 *		Ross Biro
 *		Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
 */
#ifndef _LINUX_NET_H
#define _LINUX_NET_H

#include <linux/stringify.h>
#include <linux/random.h>
#include <linux/wait.h>
#include <linux/fcntl.h>	/* For O_CLOEXEC and O_NONBLOCK */
#include <linux/rcupdate.h>
#include <linux/once.h>
#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/sockptr.h>

#include <uapi/linux/net.h>

struct poll_table_struct;
struct pipe_inode_info;
struct inode;
struct file;
struct net;

/* Historically, SOCKWQ_ASYNC_NOSPACE & SOCKWQ_ASYNC_WAITDATA were located
 * in sock->flags, but moved into sk->sk_wq->flags to be RCU protected.
 * Eventually all flags will be in sk->sk_wq->flags.
 */
#define SOCKWQ_ASYNC_NOSPACE	0
#define SOCKWQ_ASYNC_WAITDATA	1
#define SOCK_NOSPACE		2
#define SOCK_PASSCRED		3
#define SOCK_PASSSEC		4

#ifndef ARCH_HAS_SOCKET_TYPES
/**
 * enum sock_type - Socket types
 * @SOCK_STREAM: stream (connection) socket
 * @SOCK_DGRAM: datagram (conn.less) socket
 * @SOCK_RAW: raw socket
 * @SOCK_RDM: reliably-delivered message
 * @SOCK_SEQPACKET: sequential packet socket
 * @SOCK_DCCP: Datagram Congestion Control Protocol socket
 * @SOCK_PACKET: linux specific way of getting packets at the dev level.
 *		  For writing rarp and other similar things on the user level.
 *
 * When adding some new socket type please
 * grep ARCH_HAS_SOCKET_TYPE include/asm-* /socket.h, at least MIPS
 * overrides this enum for binary compat reasons.
 */
enum sock_type {
	SOCK_STREAM	= 1,
	SOCK_DGRAM	= 2,
	SOCK_RAW	= 3,
	SOCK_RDM	= 4,
	SOCK_SEQPACKET	= 5,
	SOCK_DCCP	= 6,
	SOCK_PACKET	= 10,
};

#define SOCK_MAX (SOCK_PACKET + 1)
/* Mask which covers at least up to SOCK_MASK-1.  The
 * remaining bits are used as flags. */
#define SOCK_TYPE_MASK 0xf

/* Flags for socket, socketpair, accept4 */
#define SOCK_CLOEXEC	O_CLOEXEC
#ifndef SOCK_NONBLOCK
#define SOCK_NONBLOCK	O_NONBLOCK
#endif

#endif /* ARCH_HAS_SOCKET_TYPES */

/**
 * enum sock_shutdown_cmd - Shutdown types
 * @SHUT_RD: shutdown receptions
 * @SHUT_WR: shutdown transmissions
 * @SHUT_RDWR: shutdown receptions/transmissions
 */
enum sock_shutdown_cmd {
	SHUT_RD,
	SHUT_WR,
	SHUT_RDWR,
};

struct socket_wq {
	/* Note: wait MUST be first field of socket_wq */
	wait_queue_head_t	wait;
	struct fasync_struct	*fasync_list;
	unsigned long		flags; /* %SOCKWQ_ASYNC_NOSPACE, etc */
	struct rcu_head		rcu;
} ____cacheline_aligned_in_smp;

/**
 *  struct socket - general BSD socket
 *  @state: socket state (%SS_CONNECTED, etc)
 *  @type: socket type (%SOCK_STREAM, etc)
 *  @flags: socket flags (%SOCK_NOSPACE, etc)
 *  @ops: protocol specific socket operations
 *  @file: File back pointer for gc
 *  @sk: internal networking protocol agnostic socket representation
 *  @wq: wait queue for several uses
 */
struct socket {
	socket_state		state;

	short			type;

	unsigned long		flags;

	struct file		*file;
	struct sock		*sk;
	const struct proto_ops	*ops;

	struct socket_wq	wq;
};

struct vm_area_struct;
struct page;
struct sockaddr;
struct msghdr;
struct module;
struct sk_buff;
typedef int (*sk_read_actor_t)(read_descriptor_t *, struct sk_buff *,
			       unsigned int, size_t);

struct proto_ops {
	int		family;
	struct module	*owner;
	int		(*release)   (struct socket *sock);
	int		(*bind)	     (struct socket *sock,
				      struct sockaddr *myaddr,
				      int sockaddr_len);
	int		(*connect)   (struct socket *sock,
				      struct sockaddr *vaddr,
				      int sockaddr_len, int flags);
	int		(*socketpair)(struct socket *sock1,
				      struct socket *sock2);
	int		(*accept)    (struct socket *sock,
				      struct socket *newsock, int flags, bool kern);
	int		(*getname)   (struct socket *sock,
				      struct sockaddr *addr,
				      int peer);
	__poll_t	(*poll)	     (struct file *file, struct socket *sock,
				      struct poll_table_struct *wait);
	int		(*ioctl)     (struct socket *sock, unsigned int cmd,
				      unsigned long arg);
#ifdef CONFIG_COMPAT
	int	 	(*compat_ioctl) (struct socket *sock, unsigned int cmd,
				      unsigned long arg);
#endif
	int		(*gettstamp) (struct socket *sock, void __user *userstamp,
				      bool timeval, bool time32);
	int		(*listen)    (struct socket *sock, int len);
	int		(*shutdown)  (struct socket *sock, int flags);
	int		(*setsockopt)(struct socket *sock, int level,
				      int optname, sockptr_t optval,
				      unsigned int optlen);
	int		(*getsockopt)(struct socket *sock, int level,
				      int optname, char __user *optval, int __user *optlen);
	void		(*show_fdinfo)(struct seq_file *m, struct socket *sock);
	int		(*sendmsg)   (struct socket *sock, struct msghdr *m,
				      size_t total_len);
	/* Notes for implementing recvmsg:
	 * ===============================
	 * msg->msg_namelen should get updated by the recvmsg handlers
	 * iff msg_name != NULL. It is by default 0 to prevent
	 * returning uninitialized memory to user space.  The recvfrom
	 * handlers can assume that msg.msg_name is either NULL or has
	 * a minimum size of sizeof(struct sockaddr_storage).
	 */
	int		(*recvmsg)   (struct socket *sock, struct msghdr *m,
				      size_t total_len, int flags);
	int		(*mmap)	     (struct file *file, struct socket *sock,
				      struct vm_area_struct * vma);
	ssize_t		(*sendpage)  (struct socket *sock, struct page *page,
				      int offset, size_t size, int flags);
	ssize_t 	(*splice_read)(struct socket *sock,  loff_t *ppos,
				       struct pipe_inode_info *pipe, size_t len, unsigned int flags);
	int		(*set_peek_off)(struct sock *sk, int val);
	int		(*peek_len)(struct socket *sock);

	/* The following functions are called internally by kernel with
	 * sock lock already held.
	 */
	int		(*read_sock)(struct sock *sk, read_descriptor_t *desc,
				     sk_read_actor_t recv_actor);
	int		(*sendpage_locked)(struct sock *sk, struct page *page,
					   int offset, size_t size, int flags);
	int		(*sendmsg_locked)(struct sock *sk, struct msghdr *msg,
					  size_t size);
	int		(*set_rcvlowat)(struct sock *sk, int val);
};

#define DECLARE_SOCKADDR(type, dst, src)	\
	type dst = ({ __sockaddr_check_size(sizeof(*dst)); (type) src; })

struct net_proto_family {
	int		family;
	int		(*create)(struct net *net, struct socket *sock,
				  int protocol, int kern);
	struct module	*owner;
};

struct iovec;
struct kvec;

enum {
	SOCK_WAKE_IO,
	SOCK_WAKE_WAITD,
	SOCK_WAKE_SPACE,
	SOCK_WAKE_URG,
};

int sock_wake_async(struct socket_wq *sk_wq, int how, int band);
int sock_register(const struct net_proto_family *fam);
void sock_unregister(int family);
bool sock_is_registered(int family);
int __sock_create(struct net *net, int family, int type, int proto,
		  struct socket **res, int kern);
int sock_create(int family, int type, int proto, struct socket **res);
int sock_create_kern(struct net *net, int family, int type, int proto, struct socket **res);
int sock_create_lite(int family, int type, int proto, struct socket **res);
struct socket *sock_alloc(void);
void sock_release(struct socket *sock);
int sock_sendmsg(struct socket *sock, struct msghdr *msg);
int sock_recvmsg(struct socket *sock, struct msghdr *msg, int flags);
struct file *sock_alloc_file(struct socket *sock, int flags, const char *dname);
struct socket *sockfd_lookup(int fd, int *err);
struct socket *sock_from_file(struct file *file);
#define		     sockfd_put(sock) fput(sock->file)
int net_ratelimit(void);

#define net_ratelimited_function(function, ...)			\
do {								\
	if (net_ratelimit())					\
		function(__VA_ARGS__);				\
} while (0)

#define net_emerg_ratelimited(fmt, ...)				\
	net_ratelimited_function(pr_emerg, fmt, ##__VA_ARGS__)
#define net_alert_ratelimited(fmt, ...)				\
	net_ratelimited_function(pr_alert, fmt, ##__VA_ARGS__)
#define net_crit_ratelimited(fmt, ...)				\
	net_ratelimited_function(pr_crit, fmt, ##__VA_ARGS__)
#define net_err_ratelimited(fmt, ...)				\
	net_ratelimited_function(pr_err, fmt, ##__VA_ARGS__)
#define net_notice_ratelimited(fmt, ...)			\
	net_ratelimited_function(pr_notice, fmt, ##__VA_ARGS__)
#define net_warn_ratelimited(fmt, ...)				\
	net_ratelimited_function(pr_warn, fmt, ##__VA_ARGS__)
#define net_info_ratelimited(fmt, ...)				\
	net_ratelimited_function(pr_info, fmt, ##__VA_ARGS__)
#if defined(CONFIG_DYNAMIC_DEBUG) || \
	(defined(CONFIG_DYNAMIC_DEBUG_CORE) && defined(DYNAMIC_DEBUG_MODULE))
#define net_dbg_ratelimited(fmt, ...)					\
do {									\
	DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt);			\
	if (DYNAMIC_DEBUG_BRANCH(descriptor) &&				\
	    net_ratelimit())						\
		__dynamic_pr_debug(&descriptor, pr_fmt(fmt),		\
		                   ##__VA_ARGS__);			\
} while (0)
#elif defined(DEBUG)
#define net_dbg_ratelimited(fmt, ...)				\
	net_ratelimited_function(pr_debug, fmt, ##__VA_ARGS__)
#else
#define net_dbg_ratelimited(fmt, ...)				\
	do {							\
		if (0)						\
			no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); \
	} while (0)
#endif

#define net_get_random_once(buf, nbytes)			\
	get_random_once((buf), (nbytes))
#define net_get_random_once_wait(buf, nbytes)			\
	get_random_once_wait((buf), (nbytes))

/*
 * E.g. XFS meta- & log-data is in slab pages, or bcache meta
 * data pages, or other high order pages allocated by
 * __get_free_pages() without __GFP_COMP, which have a page_count
 * of 0 and/or have PageSlab() set. We cannot use send_page for
 * those, as that does get_page(); put_page(); and would cause
 * either a VM_BUG directly, or __page_cache_release a page that
 * would actually still be referenced by someone, leading to some
 * obscure delayed Oops somewhere else.
 */
static inline bool sendpage_ok(struct page *page)
{
	return !PageSlab(page) && page_count(page) >= 1;
}

int kernel_sendmsg(struct socket *sock, struct msghdr *msg, struct kvec *vec,
		   size_t num, size_t len);
int kernel_sendmsg_locked(struct sock *sk, struct msghdr *msg,
			  struct kvec *vec, size_t num, size_t len);
int kernel_recvmsg(struct socket *sock, struct msghdr *msg, struct kvec *vec,
		   size_t num, size_t len, int flags);

int kernel_bind(struct socket *sock, struct sockaddr *addr, int addrlen);
int kernel_listen(struct socket *sock, int backlog);
int kernel_accept(struct socket *sock, struct socket **newsock, int flags);
int kernel_connect(struct socket *sock, struct sockaddr *addr, int addrlen,
		   int flags);
int kernel_getsockname(struct socket *sock, struct sockaddr *addr);
int kernel_getpeername(struct socket *sock, struct sockaddr *addr);
int kernel_sendpage(struct socket *sock, struct page *page, int offset,
		    size_t size, int flags);
int kernel_sendpage_locked(struct sock *sk, struct page *page, int offset,
			   size_t size, int flags);
int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how);

/* Routine returns the IP overhead imposed by a (caller-protected) socket. */
u32 kernel_sock_ip_overhead(struct sock *sk);

#define MODULE_ALIAS_NETPROTO(proto) \
	MODULE_ALIAS("net-pf-" __stringify(proto))

#define MODULE_ALIAS_NET_PF_PROTO(pf, proto) \
	MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto))

#define MODULE_ALIAS_NET_PF_PROTO_TYPE(pf, proto, type) \
	MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto) \
		     "-type-" __stringify(type))

#define MODULE_ALIAS_NET_PF_PROTO_NAME(pf, proto, name) \
	MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto) \
		     name)
#endif	/* _LINUX_NET_H */
Commit	Line	Data
2874c5fd	1	/* SPDX-License-Identifier: GPL-2.0-or-later */
1da177e4 LT	2	/*
	3	* NET An implementation of the SOCKET network access protocol.
	4	* This is the master header file for the Linux NET layer,
	5	* or, in plain English: the networking handling part of the
	6	* kernel.
	7	*
	8	* Version: @(#)net.h 1.0.3 05/25/93
	9	*
	10	* Authors: Orest Zborowski, <obz@Kodak.COM>
02c30a84	11	* Ross Biro
1da177e4	12	* Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
1da177e4 LT	13	*/
	14	#ifndef _LINUX_NET_H
	15	#define _LINUX_NET_H
	16
eacf17bd	17	#include <linux/stringify.h>
cb4db4c2	18	#include <linux/random.h>
5770a3fb DW	19	#include <linux/wait.h>
5770a3fb DW	20	#include <linux/fcntl.h> /* For O_CLOEXEC and O_NONBLOCK */
43815482	21	#include <linux/rcupdate.h>
46234253	22	#include <linux/once.h>
0294b625	23	#include <linux/fs.h>
c381b079	24	#include <linux/mm.h>
a7b75c5a	25	#include <linux/sockptr.h>
46234253	26
607ca46e	27	#include <uapi/linux/net.h>
5770a3fb DW	28
	29	struct poll_table_struct;
	30	struct pipe_inode_info;
	31	struct inode;
56b31d1c	32	struct file;
5770a3fb	33	struct net;
1da177e4	34
ceb5d58b ED	35	/* Historically, SOCKWQ_ASYNC_NOSPACE & SOCKWQ_ASYNC_WAITDATA were located
ceb5d58b ED	36	* in sock->flags, but moved into sk->sk_wq->flags to be RCU protected.
b3dc8f77	37	* Eventually all flags will be in sk->sk_wq->flags.
ceb5d58b	38	*/
9cd3e072 ED	39	#define SOCKWQ_ASYNC_NOSPACE 0
9cd3e072 ED	40	#define SOCKWQ_ASYNC_WAITDATA 1
1da177e4 LT	41	#define SOCK_NOSPACE 2
1da177e4 LT	42	#define SOCK_PASSCRED 3
877ce7c1	43	#define SOCK_PASSSEC 4
1da177e4 LT	44
1da177e4 LT	45	#ifndef ARCH_HAS_SOCKET_TYPES
4dc3b16b PP	46	/**
	47	* enum sock_type - Socket types
	48	* @SOCK_STREAM: stream (connection) socket
	49	* @SOCK_DGRAM: datagram (conn.less) socket
	50	* @SOCK_RAW: raw socket
	51	* @SOCK_RDM: reliably-delivered message
	52	* @SOCK_SEQPACKET: sequential packet socket
8f2709b5	53	* @SOCK_DCCP: Datagram Congestion Control Protocol socket
4dc3b16b PP	54	* @SOCK_PACKET: linux specific way of getting packets at the dev level.
	55	* For writing rarp and other similar things on the user level.
	56	*
1da177e4 LT	57	* When adding some new socket type please
	58	* grep ARCH_HAS_SOCKET_TYPE include/asm-* /socket.h, at least MIPS
	59	* overrides this enum for binary compat reasons.
1da177e4 LT	60	*/
	61	enum sock_type {
	62	SOCK_STREAM = 1,
	63	SOCK_DGRAM = 2,
	64	SOCK_RAW = 3,
	65	SOCK_RDM = 4,
	66	SOCK_SEQPACKET = 5,
7c657876	67	SOCK_DCCP = 6,
1da177e4 LT	68	SOCK_PACKET = 10,
	69	};
	70
	71	#define SOCK_MAX (SOCK_PACKET + 1)
a677a039 UD	72	/* Mask which covers at least up to SOCK_MASK-1. The
	73	* remaining bits are used as flags. */
	74	#define SOCK_TYPE_MASK 0xf
	75
de11defe	76	/* Flags for socket, socketpair, accept4 */
a677a039	77	#define SOCK_CLOEXEC O_CLOEXEC
c019bbc6 UD	78	#ifndef SOCK_NONBLOCK
	79	#define SOCK_NONBLOCK O_NONBLOCK
	80	#endif
1da177e4 LT	81
	82	#endif /* ARCH_HAS_SOCKET_TYPES */
	83
8a3c245c PT	84	/**
	85	* enum sock_shutdown_cmd - Shutdown types
	86	* @SHUT_RD: shutdown receptions
	87	* @SHUT_WR: shutdown transmissions
	88	* @SHUT_RDWR: shutdown receptions/transmissions
	89	*/
91cf45f0	90	enum sock_shutdown_cmd {
0e9649c1 JS	91	SHUT_RD,
	92	SHUT_WR,
	93	SHUT_RDWR,
91cf45f0 TM	94	};
91cf45f0 TM	95
43815482	96	struct socket_wq {
eaefd110	97	/* Note: wait MUST be first field of socket_wq */
43815482 ED	98	wait_queue_head_t wait;
43815482 ED	99	struct fasync_struct *fasync_list;
ceb5d58b	100	unsigned long flags; /* %SOCKWQ_ASYNC_NOSPACE, etc */
43815482 ED	101	struct rcu_head rcu;
	102	} ____cacheline_aligned_in_smp;
	103
1da177e4 LT	104	/**
1da177e4 LT	105	* struct socket - general BSD socket
4dc3b16b	106	* @state: socket state (%SS_CONNECTED, etc)
2c693610	107	* @type: socket type (%SOCK_STREAM, etc)
9cd3e072	108	* @flags: socket flags (%SOCK_NOSPACE, etc)
4dc3b16b	109	* @ops: protocol specific socket operations
4dc3b16b PP	110	* @file: File back pointer for gc
4dc3b16b PP	111	* @sk: internal networking protocol agnostic socket representation
e2aec372	112	* @wq: wait queue for several uses
1da177e4 LT	113	*/
	114	struct socket {
	115	socket_state state;
29a020d3	116
2c693610	117	short type;
29a020d3	118
1da177e4	119	unsigned long flags;
43815482	120
1da177e4 LT	121	struct file *file;
1da177e4 LT	122	struct sock *sk;
8bdd663a	123	const struct proto_ops *ops;
333f7909 AV	124
333f7909 AV	125	struct socket_wq wq;
1da177e4 LT	126	};
	127
	128	struct vm_area_struct;
	129	struct page;
1da177e4 LT	130	struct sockaddr;
	131	struct msghdr;
	132	struct module;
0294b625 TH	133	struct sk_buff;
	134	typedef int (sk_read_actor_t)(read_descriptor_t , struct sk_buff *,
	135	unsigned int, size_t);
1da177e4 LT	136
	137	struct proto_ops {
	138	int family;
	139	struct module *owner;
	140	int (release) (struct socket sock);
	141	int (bind) (struct socket sock,
	142	struct sockaddr *myaddr,
	143	int sockaddr_len);
	144	int (connect) (struct socket sock,
	145	struct sockaddr *vaddr,
	146	int sockaddr_len, int flags);
	147	int (socketpair)(struct socket sock1,
	148	struct socket *sock2);
	149	int (accept) (struct socket sock,
cdfbabfb	150	struct socket *newsock, int flags, bool kern);
1da177e4 LT	151	int (getname) (struct socket sock,
1da177e4 LT	152	struct sockaddr *addr,
9b2c45d4	153	int peer);
a3f8683b	154	__poll_t (poll) (struct file file, struct socket *sock,
1da177e4 LT	155	struct poll_table_struct *wait);
	156	int (ioctl) (struct socket sock, unsigned int cmd,
	157	unsigned long arg);
1621e094	158	#ifdef CONFIG_COMPAT
89bbfc95 SP	159	int (compat_ioctl) (struct socket sock, unsigned int cmd,
89bbfc95 SP	160	unsigned long arg);
1621e094	161	#endif
c7cbdbf2 AB	162	int (gettstamp) (struct socket sock, void __user *userstamp,
c7cbdbf2 AB	163	bool timeval, bool time32);
1da177e4 LT	164	int (listen) (struct socket sock, int len);
	165	int (shutdown) (struct socket sock, int flags);
	166	int (setsockopt)(struct socket sock, int level,
a7b75c5a CH	167	int optname, sockptr_t optval,
a7b75c5a CH	168	unsigned int optlen);
1da177e4 LT	169	int (getsockopt)(struct socket sock, int level,
1da177e4 LT	170	int optname, char __user optval, int __user optlen);
b4653342	171	void (show_fdinfo)(struct seq_file m, struct socket *sock);
1b784140 YX	172	int (sendmsg) (struct socket sock, struct msghdr *m,
1b784140 YX	173	size_t total_len);
f3d33426 HFS	174	/* Notes for implementing recvmsg:
	175	* ===============================
	176	* msg->msg_namelen should get updated by the recvmsg handlers
	177	* iff msg_name != NULL. It is by default 0 to prevent
	178	* returning uninitialized memory to user space. The recvfrom
	179	* handlers can assume that msg.msg_name is either NULL or has
	180	* a minimum size of sizeof(struct sockaddr_storage).
	181	*/
1b784140 YX	182	int (recvmsg) (struct socket sock, struct msghdr *m,
1b784140 YX	183	size_t total_len, int flags);
1da177e4 LT	184	int (mmap) (struct file file, struct socket *sock,
	185	struct vm_area_struct * vma);
	186	ssize_t (sendpage) (struct socket sock, struct page *page,
	187	int offset, size_t size, int flags);
9c55e01c JA	188	ssize_t (splice_read)(struct socket sock, loff_t *ppos,
9c55e01c JA	189	struct pipe_inode_info *pipe, size_t len, unsigned int flags);
12663bfc	190	int (set_peek_off)(struct sock sk, int val);
1576d986	191	int (peek_len)(struct socket sock);
306b13eb TH	192
	193	/* The following functions are called internally by kernel with
	194	* sock lock already held.
	195	*/
0294b625 TH	196	int (read_sock)(struct sock sk, read_descriptor_t *desc,
0294b625 TH	197	sk_read_actor_t recv_actor);
306b13eb TH	198	int (sendpage_locked)(struct sock sk, struct page *page,
	199	int offset, size_t size, int flags);
	200	int (sendmsg_locked)(struct sock sk, struct msghdr *msg,
	201	size_t size);
d1361840	202	int (set_rcvlowat)(struct sock sk, int val);
1da177e4 LT	203	};
1da177e4 LT	204
38bfd8f5 CG	205	#define DECLARE_SOCKADDR(type, dst, src) \
	206	type dst = ({ __sockaddr_check_size(sizeof(*dst)); (type) src; })
	207
1da177e4 LT	208	struct net_proto_family {
1da177e4 LT	209	int family;
3f378b68 EP	210	int (create)(struct net net, struct socket *sock,
3f378b68 EP	211	int protocol, int kern);
1da177e4 LT	212	struct module *owner;
	213	};
	214
	215	struct iovec;
	216	struct kvec;
	217
8d8ad9d7 PE	218	enum {
	219	SOCK_WAKE_IO,
	220	SOCK_WAKE_WAITD,
	221	SOCK_WAKE_SPACE,
	222	SOCK_WAKE_URG,
	223	};
	224
ceb5d58b	225	int sock_wake_async(struct socket_wq *sk_wq, int how, int band);
7965bd4d JP	226	int sock_register(const struct net_proto_family *fam);
7965bd4d JP	227	void sock_unregister(int family);
bf2ae2e4	228	bool sock_is_registered(int family);
7965bd4d JP	229	int __sock_create(struct net *net, int family, int type, int proto,
	230	struct socket **res, int kern);
	231	int sock_create(int family, int type, int proto, struct socket **res);
eeb1bd5c	232	int sock_create_kern(struct net net, int family, int type, int proto, struct socket *res);
7965bd4d	233	int sock_create_lite(int family, int type, int proto, struct socket **res);
f4a00aac	234	struct socket *sock_alloc(void);
7965bd4d	235	void sock_release(struct socket *sock);
d8725c86	236	int sock_sendmsg(struct socket sock, struct msghdr msg);
2da62906	237	int sock_recvmsg(struct socket sock, struct msghdr msg, int flags);
7965bd4d JP	238	struct file sock_alloc_file(struct socket sock, int flags, const char *dname);
7965bd4d JP	239	struct socket sockfd_lookup(int fd, int err);
dba4a925	240	struct socket sock_from_file(struct file file);
1da177e4	241	#define sockfd_put(sock) fput(sock->file)
7965bd4d	242	int net_ratelimit(void);
aaa248f6	243
3a3bfb61 JP	244	#define net_ratelimited_function(function, ...) \
	245	do { \
	246	if (net_ratelimit()) \
	247	function(__VA_ARGS__); \
	248	} while (0)
	249
	250	#define net_emerg_ratelimited(fmt, ...) \
	251	net_ratelimited_function(pr_emerg, fmt, ##__VA_ARGS__)
	252	#define net_alert_ratelimited(fmt, ...) \
	253	net_ratelimited_function(pr_alert, fmt, ##__VA_ARGS__)
	254	#define net_crit_ratelimited(fmt, ...) \
	255	net_ratelimited_function(pr_crit, fmt, ##__VA_ARGS__)
	256	#define net_err_ratelimited(fmt, ...) \
	257	net_ratelimited_function(pr_err, fmt, ##__VA_ARGS__)
	258	#define net_notice_ratelimited(fmt, ...) \
	259	net_ratelimited_function(pr_notice, fmt, ##__VA_ARGS__)
	260	#define net_warn_ratelimited(fmt, ...) \
	261	net_ratelimited_function(pr_warn, fmt, ##__VA_ARGS__)
	262	#define net_info_ratelimited(fmt, ...) \
	263	net_ratelimited_function(pr_info, fmt, ##__VA_ARGS__)
ceabef7d OZ	264	#if defined(CONFIG_DYNAMIC_DEBUG) \|\| \
ceabef7d OZ	265	(defined(CONFIG_DYNAMIC_DEBUG_CORE) && defined(DYNAMIC_DEBUG_MODULE))
2c94b537 TB	266	#define net_dbg_ratelimited(fmt, ...) \
	267	do { \
	268	DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt); \
3f16d181	269	if (DYNAMIC_DEBUG_BRANCH(descriptor) && \
2c94b537	270	net_ratelimit()) \
daddef76 JD	271	__dynamic_pr_debug(&descriptor, pr_fmt(fmt), \
daddef76 JD	272	##__VA_ARGS__); \
2c94b537 TB	273	} while (0)
2c94b537 TB	274	#elif defined(DEBUG)
3a3bfb61 JP	275	#define net_dbg_ratelimited(fmt, ...) \
3a3bfb61 JP	276	net_ratelimited_function(pr_debug, fmt, ##__VA_ARGS__)
d92cff89 JD	277	#else
	278	#define net_dbg_ratelimited(fmt, ...) \
	279	do { \
	280	if (0) \
	281	no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); \
	282	} while (0)
	283	#endif
3a3bfb61	284
46234253 HFS	285	#define net_get_random_once(buf, nbytes) \
46234253 HFS	286	get_random_once((buf), (nbytes))
da9ba564 JD	287	#define net_get_random_once_wait(buf, nbytes) \
da9ba564 JD	288	get_random_once_wait((buf), (nbytes))
a48e4292	289
c381b079 CL	290	/*
	291	* E.g. XFS meta- & log-data is in slab pages, or bcache meta
	292	* data pages, or other high order pages allocated by
	293	* __get_free_pages() without __GFP_COMP, which have a page_count
	294	* of 0 and/or have PageSlab() set. We cannot use send_page for
	295	* those, as that does get_page(); put_page(); and would cause
	296	* either a VM_BUG directly, or __page_cache_release a page that
	297	* would actually still be referenced by someone, leading to some
	298	* obscure delayed Oops somewhere else.
	299	*/
	300	static inline bool sendpage_ok(struct page *page)
	301	{
	302	return !PageSlab(page) && page_count(page) >= 1;
	303	}
	304
7965bd4d JP	305	int kernel_sendmsg(struct socket sock, struct msghdr msg, struct kvec *vec,
7965bd4d JP	306	size_t num, size_t len);
306b13eb TH	307	int kernel_sendmsg_locked(struct sock sk, struct msghdr msg,
306b13eb TH	308	struct kvec *vec, size_t num, size_t len);
7965bd4d JP	309	int kernel_recvmsg(struct socket sock, struct msghdr msg, struct kvec *vec,
7965bd4d JP	310	size_t num, size_t len, int flags);
1da177e4	311
7965bd4d JP	312	int kernel_bind(struct socket sock, struct sockaddr addr, int addrlen);
	313	int kernel_listen(struct socket *sock, int backlog);
	314	int kernel_accept(struct socket sock, struct socket *newsock, int flags);
	315	int kernel_connect(struct socket sock, struct sockaddr addr, int addrlen,
	316	int flags);
9b2c45d4 DV	317	int kernel_getsockname(struct socket sock, struct sockaddr addr);
9b2c45d4 DV	318	int kernel_getpeername(struct socket sock, struct sockaddr addr);
7965bd4d JP	319	int kernel_sendpage(struct socket sock, struct page page, int offset,
7965bd4d JP	320	size_t size, int flags);
306b13eb TH	321	int kernel_sendpage_locked(struct sock sk, struct page page, int offset,
306b13eb TH	322	size_t size, int flags);
7965bd4d	323	int kernel_sock_shutdown(struct socket *sock, enum sock_shutdown_cmd how);
ac5a488e	324
57240d00	325	/* Routine returns the IP overhead imposed by a (caller-protected) socket. */
113c3075 P	326	u32 kernel_sock_ip_overhead(struct sock *sk);
113c3075 P	327
1da177e4 LT	328	#define MODULE_ALIAS_NETPROTO(proto) \
	329	MODULE_ALIAS("net-pf-" __stringify(proto))
	330
4fdb3bb7 HW	331	#define MODULE_ALIAS_NET_PF_PROTO(pf, proto) \
	332	MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto))
	333
305e1e96 JD	334	#define MODULE_ALIAS_NET_PF_PROTO_TYPE(pf, proto, type) \
	335	MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto) \
	336	"-type-" __stringify(type))
	337
2033e9bf NH	338	#define MODULE_ALIAS_NET_PF_PROTO_NAME(pf, proto, name) \
	339	MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto) \
	340	name)
1da177e4	341	#endif /* _LINUX_NET_H */