include/linux/net.h

/*
 * 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, <bir7@leland.Stanford.Edu>
 *		Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
 *
 *		This program is free software; you can redistribute it and/or
 *		modify it under the terms of the GNU General Public License
 *		as published by the Free Software Foundation; either version
 *		2 of the License, or (at your option) any later version.
 */
#ifndef _LINUX_NET_H
#define _LINUX_NET_H

#include <linux/config.h>
#include <linux/socket.h>
#include <linux/wait.h>

struct poll_table_struct;
struct inode;

#define NPROTO		32		/* should be enough for now..	*/


#define SYS_SOCKET	1		/* sys_socket(2)		*/
#define SYS_BIND	2		/* sys_bind(2)			*/
#define SYS_CONNECT	3		/* sys_connect(2)		*/
#define SYS_LISTEN	4		/* sys_listen(2)		*/
#define SYS_ACCEPT	5		/* sys_accept(2)		*/
#define SYS_GETSOCKNAME	6		/* sys_getsockname(2)		*/
#define SYS_GETPEERNAME	7		/* sys_getpeername(2)		*/
#define SYS_SOCKETPAIR	8		/* sys_socketpair(2)		*/
#define SYS_SEND	9		/* sys_send(2)			*/
#define SYS_RECV	10		/* sys_recv(2)			*/
#define SYS_SENDTO	11		/* sys_sendto(2)		*/
#define SYS_RECVFROM	12		/* sys_recvfrom(2)		*/
#define SYS_SHUTDOWN	13		/* sys_shutdown(2)		*/
#define SYS_SETSOCKOPT	14		/* sys_setsockopt(2)		*/
#define SYS_GETSOCKOPT	15		/* sys_getsockopt(2)		*/
#define SYS_SENDMSG	16		/* sys_sendmsg(2)		*/
#define SYS_RECVMSG	17		/* sys_recvmsg(2)		*/


typedef enum {
  SS_FREE = 0,				/* not allocated		*/
  SS_UNCONNECTED,			/* unconnected to any socket	*/
  SS_CONNECTING,			/* in process of connecting	*/
  SS_CONNECTED,				/* connected to socket		*/
  SS_DISCONNECTING			/* in process of disconnecting	*/
} socket_state;

#define __SO_ACCEPTCON	(1<<16)		/* performed a listen		*/

#ifdef __KERNEL__

#define SOCK_ASYNC_NOSPACE	0
#define SOCK_ASYNC_WAITDATA	1
#define SOCK_NOSPACE		2

struct socket
{
	socket_state		state;

	unsigned long		flags;
	struct proto_ops	*ops;
	struct fasync_struct	*fasync_list;	/* Asynchronous wake up list	*/
	struct file		*file;		/* File back pointer for gc	*/
	struct sock		*sk;
	wait_queue_head_t	wait;

	short			type;
	unsigned char		passcred;
};

struct scm_cookie;
struct vm_area_struct;
struct page;

struct proto_ops {
  int	family;

  int	(*release)	(struct socket *sock);
  int	(*bind)		(struct socket *sock, struct sockaddr *umyaddr,
			 int sockaddr_len);
  int	(*connect)	(struct socket *sock, struct sockaddr *uservaddr,
			 int sockaddr_len, int flags);
  int	(*socketpair)	(struct socket *sock1, struct socket *sock2);
  int	(*accept)	(struct socket *sock, struct socket *newsock,
			 int flags);
  int	(*getname)	(struct socket *sock, struct sockaddr *uaddr,
			 int *usockaddr_len, int peer);
  unsigned int (*poll)	(struct file *file, struct socket *sock, struct poll_table_struct *wait);
  int	(*ioctl)	(struct socket *sock, unsigned int cmd,
			 unsigned long arg);
  int	(*listen)	(struct socket *sock, int len);
  int	(*shutdown)	(struct socket *sock, int flags);
  int	(*setsockopt)	(struct socket *sock, int level, int optname,
			 char *optval, int optlen);
  int	(*getsockopt)	(struct socket *sock, int level, int optname,
			 char *optval, int *optlen);
  int   (*sendmsg)	(struct socket *sock, struct msghdr *m, int total_len, struct scm_cookie *scm);
  int   (*recvmsg)	(struct socket *sock, struct msghdr *m, int total_len, int flags, struct scm_cookie *scm);
  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);
};

struct net_proto_family 
{
	int	family;
	int	(*create)(struct socket *sock, int protocol);
	/* These are counters for the number of different methods of
	   each we support */
	short	authentication;
	short	encryption;
	short	encrypt_net;
};

struct net_proto 
{
	const char *name;		/* Protocol name */
	void (*init_func)(struct net_proto *);	/* Bootstrap */
};

extern int	sock_wake_async(struct socket *sk, int how, int band);
extern int	sock_register(struct net_proto_family *fam);
extern int	sock_unregister(int family);
extern struct socket *sock_alloc(void);
extern int	sock_create(int family, int type, int proto, struct socket **);
extern void	sock_release(struct socket *);
extern int   	sock_sendmsg(struct socket *, struct msghdr *m, int len);
extern int	sock_recvmsg(struct socket *, struct msghdr *m, int len, int flags);
extern int	sock_readv_writev(int type, struct inode * inode, struct file * file,
				  const struct iovec * iov, long count, long size);

extern int	net_ratelimit(void);
extern unsigned long net_random(void);
extern void net_srandom(unsigned long);

#ifndef CONFIG_SMP
#define SOCKOPS_WRAPPED(name) name
#define SOCKOPS_WRAP(name, fam)
#else

#define SOCKOPS_WRAPPED(name) __unlocked_##name

#define SOCKCALL_WRAP(name, call, parms, args)		\
static int __lock_##name##_##call  parms		\
{							\
	int ret;					\
	lock_kernel();					\
	ret = __unlocked_##name##_ops.call  args ;\
	unlock_kernel();				\
	return ret;					\
}

#define SOCKCALL_UWRAP(name, call, parms, args)		\
static unsigned int __lock_##name##_##call  parms	\
{							\
	int ret;					\
	lock_kernel();					\
	ret = __unlocked_##name##_ops.call  args ;\
	unlock_kernel();				\
	return ret;					\
}


#define SOCKOPS_WRAP(name, fam)					\
SOCKCALL_WRAP(name, release, (struct socket *sock), (sock))	\
SOCKCALL_WRAP(name, bind, (struct socket *sock, struct sockaddr *uaddr, int addr_len), \
	      (sock, uaddr, addr_len))				\
SOCKCALL_WRAP(name, connect, (struct socket *sock, struct sockaddr * uaddr, \
			      int addr_len, int flags), 	\
	      (sock, uaddr, addr_len, flags))			\
SOCKCALL_WRAP(name, socketpair, (struct socket *sock1, struct socket *sock2), \
	      (sock1, sock2))					\
SOCKCALL_WRAP(name, accept, (struct socket *sock, struct socket *newsock, \
			 int flags), (sock, newsock, flags)) \
SOCKCALL_WRAP(name, getname, (struct socket *sock, struct sockaddr *uaddr, \
			 int *addr_len, int peer), (sock, uaddr, addr_len, peer)) \
SOCKCALL_UWRAP(name, poll, (struct file *file, struct socket *sock, struct poll_table_struct *wait), \
	      (file, sock, wait)) \
SOCKCALL_WRAP(name, ioctl, (struct socket *sock, unsigned int cmd, \
			 unsigned long arg), (sock, cmd, arg)) \
SOCKCALL_WRAP(name, listen, (struct socket *sock, int len), (sock, len)) \
SOCKCALL_WRAP(name, shutdown, (struct socket *sock, int flags), (sock, flags)) \
SOCKCALL_WRAP(name, setsockopt, (struct socket *sock, int level, int optname, \
			 char *optval, int optlen), (sock, level, optname, optval, optlen)) \
SOCKCALL_WRAP(name, getsockopt, (struct socket *sock, int level, int optname, \
			 char *optval, int *optlen), (sock, level, optname, optval, optlen)) \
SOCKCALL_WRAP(name, sendmsg, (struct socket *sock, struct msghdr *m, int len, struct scm_cookie *scm), \
	      (sock, m, len, scm)) \
SOCKCALL_WRAP(name, recvmsg, (struct socket *sock, struct msghdr *m, int len, int flags, struct scm_cookie *scm), \
	      (sock, m, len, flags, scm)) \
SOCKCALL_WRAP(name, mmap, (struct file *file, struct socket *sock, struct vm_area_struct *vma), \
	      (file, sock, vma)) \
	      \
static struct proto_ops name##_ops = {			\
	family:		fam,				\
							\
	release:	__lock_##name##_release,	\
	bind:		__lock_##name##_bind,		\
	connect:	__lock_##name##_connect,	\
	socketpair:	__lock_##name##_socketpair,	\
	accept:		__lock_##name##_accept,		\
	getname:	__lock_##name##_getname,	\
	poll:		__lock_##name##_poll,		\
	ioctl:		__lock_##name##_ioctl,		\
	listen:		__lock_##name##_listen,		\
	shutdown:	__lock_##name##_shutdown,	\
	setsockopt:	__lock_##name##_setsockopt,	\
	getsockopt:	__lock_##name##_getsockopt,	\
	sendmsg:	__lock_##name##_sendmsg,	\
	recvmsg:	__lock_##name##_recvmsg,	\
	mmap:		__lock_##name##_mmap,		\
};
#endif


#endif /* __KERNEL__ */
#endif	/* _LINUX_NET_H */