text: /*
   * 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>
   *
   *		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/wait.h>
  #include <asm/socket.h>
  
  struct poll_table_struct;
  struct pipe_inode_info;
  struct inode;
  
  #define NPROTO		34		/* 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__
  #include <linux/stringify.h>
  #include <linux/random.h>
  
  #define SOCK_ASYNC_NOSPACE	0
  #define SOCK_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)
  
  #endif /* ARCH_HAS_SOCKET_TYPES */
  
  /**
   *  struct socket - general BSD socket
   *  @state: socket state (%SS_CONNECTED, etc)
   *  @flags: socket flags (%SOCK_ASYNC_NOSPACE, etc)
   *  @ops: protocol specific socket operations
   *  @fasync_list: Asynchronous wake up list
   *  @file: File back pointer for gc
   *  @sk: internal networking protocol agnostic socket representation
   *  @wait: wait queue for several uses
   *  @type: socket type (%SOCK_STREAM, etc)
   */
  struct socket {
  	socket_state		state;
  	unsigned long		flags;
  
  	/*
  	 * Please keep fasync_list & wait fields in the same cache line
  	 */
  	struct fasync_struct	*fasync_list;
  	wait_queue_head_t	wait;
  
  	struct file		*file;
  	struct sock		*sk;
  	short			type;
  	const struct proto_ops	*ops;
  };
  
  struct vm_area_struct;
  struct page;
  struct kiocb;
  struct sockaddr;
  struct msghdr;
  struct module;
  
  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);
  	int		(*getname)   (struct socket *sock,
  				      struct sockaddr *addr,
  				      int *sockaddr_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	 	(*compat_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 __user *optval, int optlen);
  	int		(*getsockopt)(struct socket *sock, int level,
  				      int optname, char __user *optval, int __user *optlen);
  	int		(*compat_setsockopt)(struct socket *sock, int level,
  				      int optname, char __user *optval, int optlen);
  	int		(*compat_getsockopt)(struct socket *sock, int level,
  				      int optname, char __user *optval, int __user *optlen);
  	int		(*sendmsg)   (struct kiocb *iocb, struct socket *sock,
  				      struct msghdr *m, size_t total_len);
  	int		(*recvmsg)   (struct kiocb *iocb, 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);
  };
  
  struct net_proto_family {
  	int		family;
  	int		(*create)(struct socket *sock, int protocol);
  	struct module	*owner;
  };
  
  struct iovec;
  struct kvec;
  
  extern int	     sock_wake_async(struct socket *sk, int how, int band);
  extern int	     sock_register(const struct net_proto_family *fam);
  extern void	     sock_unregister(int family);
  extern int	     sock_create(int family, int type, int proto,
  				 struct socket **res);
  extern int	     sock_create_kern(int family, int type, int proto,
  				      struct socket **res);
  extern int	     sock_create_lite(int family, int type, int proto,
  				      struct socket **res); 
  extern void	     sock_release(struct socket *sock);
  extern int   	     sock_sendmsg(struct socket *sock, struct msghdr *msg,
  				  size_t len);
  extern int	     sock_recvmsg(struct socket *sock, struct msghdr *msg,
  				  size_t size, int flags);
  extern int 	     sock_map_fd(struct socket *sock);
  extern struct socket *sockfd_lookup(int fd, int *err);
  #define		     sockfd_put(sock) fput(sock->file)
  extern int	     net_ratelimit(void);
  
  #define net_random()		random32()
  #define net_srandom(seed)	srandom32((__force u32)seed)
  
  extern int   	     kernel_sendmsg(struct socket *sock, struct msghdr *msg,
  				    struct kvec *vec, size_t num, size_t len);
  extern int   	     kernel_recvmsg(struct socket *sock, struct msghdr *msg,
  				    struct kvec *vec, size_t num,
  				    size_t len, int flags);
  
  extern int kernel_bind(struct socket *sock, struct sockaddr *addr,
  		       int addrlen);
  extern int kernel_listen(struct socket *sock, int backlog);
  extern int kernel_accept(struct socket *sock, struct socket **newsock,
  			 int flags);
  extern int kernel_connect(struct socket *sock, struct sockaddr *addr,
  			  int addrlen, int flags);
  extern int kernel_getsockname(struct socket *sock, struct sockaddr *addr,
  			      int *addrlen);
  extern int kernel_getpeername(struct socket *sock, struct sockaddr *addr,
  			      int *addrlen);
  extern int kernel_getsockopt(struct socket *sock, int level, int optname,
  			     char *optval, int *optlen);
  extern int kernel_setsockopt(struct socket *sock, int level, int optname,
  			     char *optval, int optlen);
  extern int kernel_sendpage(struct socket *sock, struct page *page, int offset,
  			   size_t size, int flags);
  extern int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg);
  
  #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, compat_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 __user *optval, int optlen), (sock, level, optname, optval, optlen)) \
  SOCKCALL_WRAP(name, getsockopt, (struct socket *sock, int level, int optname, \
  			 char __user *optval, int __user *optlen), (sock, level, optname, optval, optlen)) \
  SOCKCALL_WRAP(name, sendmsg, (struct kiocb *iocb, struct socket *sock, struct msghdr *m, size_t len), \
  	      (iocb, sock, m, len)) \
  SOCKCALL_WRAP(name, recvmsg, (struct kiocb *iocb, struct socket *sock, struct msghdr *m, size_t len, int flags), \
  	      (iocb, sock, m, len, flags)) \
  SOCKCALL_WRAP(name, mmap, (struct file *file, struct socket *sock, struct vm_area_struct *vma), \
  	      (file, sock, vma)) \
  	      \
  static const struct proto_ops name##_ops = {			\
  	.family		= fam,				\
  	.owner		= THIS_MODULE,			\
  	.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,	\
  	.compat_ioctl	= __lock_##name##_compat_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
  
  #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))
  
  #ifdef CONFIG_SYSCTL
  #include <linux/sysctl.h>
  extern ctl_table net_table[];
  extern int net_msg_cost;
  extern int net_msg_burst;
  #endif
  
  #endif /* __KERNEL__ */
  #endif	/* _LINUX_NET_H */
  