1/*
2 * NET		An implementation of the SOCKET network access protocol.
3 *		This is the master header file for the Linux NET layer,
4 *		or, in plain English: the networking handling part of the
5 *		kernel.
6 *
7 * Version:	@(#)net.h	1.0.3	05/25/93
8 *
9 * Authors:	Orest Zborowski, <obz@Kodak.COM>
10 *		Ross Biro
11 *		Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 *
13 *		This program is free software; you can redistribute it and/or
14 *		modify it under the terms of the GNU General Public License
15 *		as published by the Free Software Foundation; either version
16 *		2 of the License, or (at your option) any later version.
17 */
18#ifndef _LINUX_NET_H
19#define _LINUX_NET_H
20
21#include <linux/wait.h>
22#include <asm/socket.h>
23
24struct poll_table_struct;
25struct inode;
26
27#define NPROTO		32		/* should be enough for now..	*/
28
29#define SYS_SOCKET	1		/* sys_socket(2)		*/
30#define SYS_BIND	2		/* sys_bind(2)			*/
31#define SYS_CONNECT	3		/* sys_connect(2)		*/
32#define SYS_LISTEN	4		/* sys_listen(2)		*/
33#define SYS_ACCEPT	5		/* sys_accept(2)		*/
34#define SYS_GETSOCKNAME	6		/* sys_getsockname(2)		*/
35#define SYS_GETPEERNAME	7		/* sys_getpeername(2)		*/
36#define SYS_SOCKETPAIR	8		/* sys_socketpair(2)		*/
37#define SYS_SEND	9		/* sys_send(2)			*/
38#define SYS_RECV	10		/* sys_recv(2)			*/
39#define SYS_SENDTO	11		/* sys_sendto(2)		*/
40#define SYS_RECVFROM	12		/* sys_recvfrom(2)		*/
41#define SYS_SHUTDOWN	13		/* sys_shutdown(2)		*/
42#define SYS_SETSOCKOPT	14		/* sys_setsockopt(2)		*/
43#define SYS_GETSOCKOPT	15		/* sys_getsockopt(2)		*/
44#define SYS_SENDMSG	16		/* sys_sendmsg(2)		*/
45#define SYS_RECVMSG	17		/* sys_recvmsg(2)		*/
46
47typedef enum {
48	SS_FREE = 0,			/* not allocated		*/
49	SS_UNCONNECTED,			/* unconnected to any socket	*/
50	SS_CONNECTING,			/* in process of connecting	*/
51	SS_CONNECTED,			/* connected to socket		*/
52	SS_DISCONNECTING		/* in process of disconnecting	*/
53} socket_state;
54
55#define __SO_ACCEPTCON	(1 << 16)	/* performed a listen		*/
56
57#ifdef __KERNEL__
58#include <linux/stringify.h>
59
60#define SOCK_ASYNC_NOSPACE	0
61#define SOCK_ASYNC_WAITDATA	1
62#define SOCK_NOSPACE		2
63#define SOCK_PASSCRED		3
64#define SOCK_PASSSEC		4
65
66#ifndef ARCH_HAS_SOCKET_TYPES
67/**
68 * enum sock_type - Socket types
69 * @SOCK_STREAM: stream (connection) socket
70 * @SOCK_DGRAM: datagram (conn.less) socket
71 * @SOCK_RAW: raw socket
72 * @SOCK_RDM: reliably-delivered message
73 * @SOCK_SEQPACKET: sequential packet socket
74 * @SOCK_DCCP: Datagram Congestion Control Protocol socket
75 * @SOCK_PACKET: linux specific way of getting packets at the dev level.
76 *		  For writing rarp and other similar things on the user level.
77 *
78 * When adding some new socket type please
79 * grep ARCH_HAS_SOCKET_TYPE include/asm-* /socket.h, at least MIPS
80 * overrides this enum for binary compat reasons.
81 */
82enum sock_type {
83	SOCK_STREAM	= 1,
84	SOCK_DGRAM	= 2,
85	SOCK_RAW	= 3,
86	SOCK_RDM	= 4,
87	SOCK_SEQPACKET	= 5,
88	SOCK_DCCP	= 6,
89	SOCK_PACKET	= 10,
90};
91
92#define SOCK_MAX (SOCK_PACKET + 1)
93
94#endif /* ARCH_HAS_SOCKET_TYPES */
95
96/**
97 *  struct socket - general BSD socket
98 *  @state: socket state (%SS_CONNECTED, etc)
99 *  @flags: socket flags (%SOCK_ASYNC_NOSPACE, etc)
100 *  @ops: protocol specific socket operations
101 *  @fasync_list: Asynchronous wake up list
102 *  @file: File back pointer for gc
103 *  @sk: internal networking protocol agnostic socket representation
104 *  @wait: wait queue for several uses
105 *  @type: socket type (%SOCK_STREAM, etc)
106 */
107struct socket {
108	socket_state		state;
109	unsigned long		flags;
110	const struct proto_ops	*ops;
111	struct fasync_struct	*fasync_list;
112	struct file		*file;
113	struct sock		*sk;
114	wait_queue_head_t	wait;
115	short			type;
116};
117
118struct vm_area_struct;
119struct page;
120struct kiocb;
121struct sockaddr;
122struct msghdr;
123struct module;
124
125struct proto_ops {
126	int		family;
127	struct module	*owner;
128	int		(*release)   (struct socket *sock);
129	int		(*bind)	     (struct socket *sock,
130				      struct sockaddr *myaddr,
131				      int sockaddr_len);
132	int		(*connect)   (struct socket *sock,
133				      struct sockaddr *vaddr,
134				      int sockaddr_len, int flags);
135	int		(*socketpair)(struct socket *sock1,
136				      struct socket *sock2);
137	int		(*accept)    (struct socket *sock,
138				      struct socket *newsock, int flags);
139	int		(*getname)   (struct socket *sock,
140				      struct sockaddr *addr,
141				      int *sockaddr_len, int peer);
142	unsigned int	(*poll)	     (struct file *file, struct socket *sock,
143				      struct poll_table_struct *wait);
144	int		(*ioctl)     (struct socket *sock, unsigned int cmd,
145				      unsigned long arg);
146	int	 	(*compat_ioctl) (struct socket *sock, unsigned int cmd,
147				      unsigned long arg);
148	int		(*listen)    (struct socket *sock, int len);
149	int		(*shutdown)  (struct socket *sock, int flags);
150	int		(*setsockopt)(struct socket *sock, int level,
151				      int optname, char __user *optval, int optlen);
152	int		(*getsockopt)(struct socket *sock, int level,
153				      int optname, char __user *optval, int __user *optlen);
154	int		(*compat_setsockopt)(struct socket *sock, int level,
155				      int optname, char __user *optval, int optlen);
156	int		(*compat_getsockopt)(struct socket *sock, int level,
157				      int optname, char __user *optval, int __user *optlen);
158	int		(*sendmsg)   (struct kiocb *iocb, struct socket *sock,
159				      struct msghdr *m, size_t total_len);
160	int		(*recvmsg)   (struct kiocb *iocb, struct socket *sock,
161				      struct msghdr *m, size_t total_len,
162				      int flags);
163	int		(*mmap)	     (struct file *file, struct socket *sock,
164				      struct vm_area_struct * vma);
165	ssize_t		(*sendpage)  (struct socket *sock, struct page *page,
166				      int offset, size_t size, int flags);
167};
168
169struct net_proto_family {
170	int		family;
171	int		(*create)(struct socket *sock, int protocol);
172	/* These are counters for the number of different methods of
173	   each we support */
174	short		authentication;
175	short		encryption;
176	short		encrypt_net;
177	struct module	*owner;
178};
179
180struct iovec;
181struct kvec;
182
183extern int	     sock_wake_async(struct socket *sk, int how, int band);
184extern int	     sock_register(struct net_proto_family *fam);
185extern int	     sock_unregister(int family);
186extern int	     sock_create(int family, int type, int proto,
187				 struct socket **res);
188extern int	     sock_create_kern(int family, int type, int proto,
189				      struct socket **res);
190extern int	     sock_create_lite(int family, int type, int proto,
191				      struct socket **res);
192extern void	     sock_release(struct socket *sock);
193extern int   	     sock_sendmsg(struct socket *sock, struct msghdr *msg,
194				  size_t len);
195extern int	     sock_recvmsg(struct socket *sock, struct msghdr *msg,
196				  size_t size, int flags);
197extern int 	     sock_map_fd(struct socket *sock);
198extern struct socket *sockfd_lookup(int fd, int *err);
199#define		     sockfd_put(sock) fput(sock->file)
200extern int	     net_ratelimit(void);
201extern unsigned long net_random(void);
202extern void	     net_srandom(unsigned long);
203extern void	     net_random_init(void);
204
205extern int   	     kernel_sendmsg(struct socket *sock, struct msghdr *msg,
206				    struct kvec *vec, size_t num, size_t len);
207extern int   	     kernel_recvmsg(struct socket *sock, struct msghdr *msg,
208				    struct kvec *vec, size_t num,
209				    size_t len, int flags);
210
211#ifndef CONFIG_SMP
212#define SOCKOPS_WRAPPED(name) name
213#define SOCKOPS_WRAP(name, fam)
214#else
215
216#define SOCKOPS_WRAPPED(name) __unlocked_##name
217
218#define SOCKCALL_WRAP(name, call, parms, args)		\
219static int __lock_##name##_##call  parms		\
220{							\
221	int ret;					\
222	lock_kernel();					\
223	ret = __unlocked_##name##_ops.call  args ;\
224	unlock_kernel();				\
225	return ret;					\
226}
227
228#define SOCKCALL_UWRAP(name, call, parms, args)		\
229static unsigned int __lock_##name##_##call  parms	\
230{							\
231	int ret;					\
232	lock_kernel();					\
233	ret = __unlocked_##name##_ops.call  args ;\
234	unlock_kernel();				\
235	return ret;					\
236}
237
238
239#define SOCKOPS_WRAP(name, fam)					\
240SOCKCALL_WRAP(name, release, (struct socket *sock), (sock))	\
241SOCKCALL_WRAP(name, bind, (struct socket *sock, struct sockaddr *uaddr, int addr_len), \
242	      (sock, uaddr, addr_len))				\
243SOCKCALL_WRAP(name, connect, (struct socket *sock, struct sockaddr * uaddr, \
244			      int addr_len, int flags), 	\
245	      (sock, uaddr, addr_len, flags))			\
246SOCKCALL_WRAP(name, socketpair, (struct socket *sock1, struct socket *sock2), \
247	      (sock1, sock2))					\
248SOCKCALL_WRAP(name, accept, (struct socket *sock, struct socket *newsock, \
249			 int flags), (sock, newsock, flags)) \
250SOCKCALL_WRAP(name, getname, (struct socket *sock, struct sockaddr *uaddr, \
251			 int *addr_len, int peer), (sock, uaddr, addr_len, peer)) \
252SOCKCALL_UWRAP(name, poll, (struct file *file, struct socket *sock, struct poll_table_struct *wait), \
253	      (file, sock, wait)) \
254SOCKCALL_WRAP(name, ioctl, (struct socket *sock, unsigned int cmd, \
255			 unsigned long arg), (sock, cmd, arg)) \
256SOCKCALL_WRAP(name, compat_ioctl, (struct socket *sock, unsigned int cmd, \
257			 unsigned long arg), (sock, cmd, arg)) \
258SOCKCALL_WRAP(name, listen, (struct socket *sock, int len), (sock, len)) \
259SOCKCALL_WRAP(name, shutdown, (struct socket *sock, int flags), (sock, flags)) \
260SOCKCALL_WRAP(name, setsockopt, (struct socket *sock, int level, int optname, \
261			 char __user *optval, int optlen), (sock, level, optname, optval, optlen)) \
262SOCKCALL_WRAP(name, getsockopt, (struct socket *sock, int level, int optname, \
263			 char __user *optval, int __user *optlen), (sock, level, optname, optval, optlen)) \
264SOCKCALL_WRAP(name, sendmsg, (struct kiocb *iocb, struct socket *sock, struct msghdr *m, size_t len), \
265	      (iocb, sock, m, len)) \
266SOCKCALL_WRAP(name, recvmsg, (struct kiocb *iocb, struct socket *sock, struct msghdr *m, size_t len, int flags), \
267	      (iocb, sock, m, len, flags)) \
268SOCKCALL_WRAP(name, mmap, (struct file *file, struct socket *sock, struct vm_area_struct *vma), \
269	      (file, sock, vma)) \
270	      \
271static const struct proto_ops name##_ops = {			\
272	.family		= fam,				\
273	.owner		= THIS_MODULE,			\
274	.release	= __lock_##name##_release,	\
275	.bind		= __lock_##name##_bind,		\
276	.connect	= __lock_##name##_connect,	\
277	.socketpair	= __lock_##name##_socketpair,	\
278	.accept		= __lock_##name##_accept,	\
279	.getname	= __lock_##name##_getname,	\
280	.poll		= __lock_##name##_poll,		\
281	.ioctl		= __lock_##name##_ioctl,	\
282	.compat_ioctl	= __lock_##name##_compat_ioctl,	\
283	.listen		= __lock_##name##_listen,	\
284	.shutdown	= __lock_##name##_shutdown,	\
285	.setsockopt	= __lock_##name##_setsockopt,	\
286	.getsockopt	= __lock_##name##_getsockopt,	\
287	.sendmsg	= __lock_##name##_sendmsg,	\
288	.recvmsg	= __lock_##name##_recvmsg,	\
289	.mmap		= __lock_##name##_mmap,		\
290};
291
292#endif
293
294#define MODULE_ALIAS_NETPROTO(proto) \
295	MODULE_ALIAS("net-pf-" __stringify(proto))
296
297#define MODULE_ALIAS_NET_PF_PROTO(pf, proto) \
298	MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto))
299
300#ifdef CONFIG_SYSCTL
301#include <linux/sysctl.h>
302extern ctl_table net_table[];
303extern int net_msg_cost;
304extern int net_msg_burst;
305#endif
306
307#endif /* __KERNEL__ */
308#endif	/* _LINUX_NET_H */
309