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		34		/* 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#include <linux/random.h>
60
61#define SOCK_ASYNC_NOSPACE	0
62#define SOCK_ASYNC_WAITDATA	1
63#define SOCK_NOSPACE		2
64#define SOCK_PASSCRED		3
65#define SOCK_PASSSEC		4
66
67#ifndef ARCH_HAS_SOCKET_TYPES
68/**
69 * enum sock_type - Socket types
70 * @SOCK_STREAM: stream (connection) socket
71 * @SOCK_DGRAM: datagram (conn.less) socket
72 * @SOCK_RAW: raw socket
73 * @SOCK_RDM: reliably-delivered message
74 * @SOCK_SEQPACKET: sequential packet socket
75 * @SOCK_DCCP: Datagram Congestion Control Protocol socket
76 * @SOCK_PACKET: linux specific way of getting packets at the dev level.
77 *		  For writing rarp and other similar things on the user level.
78 *
79 * When adding some new socket type please
80 * grep ARCH_HAS_SOCKET_TYPE include/asm-* /socket.h, at least MIPS
81 * overrides this enum for binary compat reasons.
82 */
83enum sock_type {
84	SOCK_STREAM	= 1,
85	SOCK_DGRAM	= 2,
86	SOCK_RAW	= 3,
87	SOCK_RDM	= 4,
88	SOCK_SEQPACKET	= 5,
89	SOCK_DCCP	= 6,
90	SOCK_PACKET	= 10,
91};
92
93#define SOCK_MAX (SOCK_PACKET + 1)
94
95#endif /* ARCH_HAS_SOCKET_TYPES */
96
97/**
98 *  struct socket - general BSD socket
99 *  @state: socket state (%SS_CONNECTED, etc)
100 *  @flags: socket flags (%SOCK_ASYNC_NOSPACE, etc)
101 *  @ops: protocol specific socket operations
102 *  @fasync_list: Asynchronous wake up list
103 *  @file: File back pointer for gc
104 *  @sk: internal networking protocol agnostic socket representation
105 *  @wait: wait queue for several uses
106 *  @type: socket type (%SOCK_STREAM, etc)
107 */
108struct socket {
109	socket_state		state;
110	unsigned long		flags;
111	const struct proto_ops	*ops;
112	struct fasync_struct	*fasync_list;
113	struct file		*file;
114	struct sock		*sk;
115	wait_queue_head_t	wait;
116	short			type;
117};
118
119struct vm_area_struct;
120struct page;
121struct kiocb;
122struct sockaddr;
123struct msghdr;
124struct module;
125
126struct proto_ops {
127	int		family;
128	struct module	*owner;
129	int		(*release)   (struct socket *sock);
130	int		(*bind)	     (struct socket *sock,
131				      struct sockaddr *myaddr,
132				      int sockaddr_len);
133	int		(*connect)   (struct socket *sock,
134				      struct sockaddr *vaddr,
135				      int sockaddr_len, int flags);
136	int		(*socketpair)(struct socket *sock1,
137				      struct socket *sock2);
138	int		(*accept)    (struct socket *sock,
139				      struct socket *newsock, int flags);
140	int		(*getname)   (struct socket *sock,
141				      struct sockaddr *addr,
142				      int *sockaddr_len, int peer);
143	unsigned int	(*poll)	     (struct file *file, struct socket *sock,
144				      struct poll_table_struct *wait);
145	int		(*ioctl)     (struct socket *sock, unsigned int cmd,
146				      unsigned long arg);
147	int	 	(*compat_ioctl) (struct socket *sock, unsigned int cmd,
148				      unsigned long arg);
149	int		(*listen)    (struct socket *sock, int len);
150	int		(*shutdown)  (struct socket *sock, int flags);
151	int		(*setsockopt)(struct socket *sock, int level,
152				      int optname, char __user *optval, int optlen);
153	int		(*getsockopt)(struct socket *sock, int level,
154				      int optname, char __user *optval, int __user *optlen);
155	int		(*compat_setsockopt)(struct socket *sock, int level,
156				      int optname, char __user *optval, int optlen);
157	int		(*compat_getsockopt)(struct socket *sock, int level,
158				      int optname, char __user *optval, int __user *optlen);
159	int		(*sendmsg)   (struct kiocb *iocb, struct socket *sock,
160				      struct msghdr *m, size_t total_len);
161	int		(*recvmsg)   (struct kiocb *iocb, struct socket *sock,
162				      struct msghdr *m, size_t total_len,
163				      int flags);
164	int		(*mmap)	     (struct file *file, struct socket *sock,
165				      struct vm_area_struct * vma);
166	ssize_t		(*sendpage)  (struct socket *sock, struct page *page,
167				      int offset, size_t size, int flags);
168};
169
170struct net_proto_family {
171	int		family;
172	int		(*create)(struct socket *sock, int protocol);
173	struct module	*owner;
174};
175
176struct iovec;
177struct kvec;
178
179extern int	     sock_wake_async(struct socket *sk, int how, int band);
180extern int	     sock_register(const struct net_proto_family *fam);
181extern void	     sock_unregister(int family);
182extern int	     sock_create(int family, int type, int proto,
183				 struct socket **res);
184extern int	     sock_create_kern(int family, int type, int proto,
185				      struct socket **res);
186extern int	     sock_create_lite(int family, int type, int proto,
187				      struct socket **res);
188extern void	     sock_release(struct socket *sock);
189extern int   	     sock_sendmsg(struct socket *sock, struct msghdr *msg,
190				  size_t len);
191extern int	     sock_recvmsg(struct socket *sock, struct msghdr *msg,
192				  size_t size, int flags);
193extern int 	     sock_map_fd(struct socket *sock);
194extern struct socket *sockfd_lookup(int fd, int *err);
195#define		     sockfd_put(sock) fput(sock->file)
196extern int	     net_ratelimit(void);
197
198#define net_random()		random32()
199#define net_srandom(seed)	srandom32((__force u32)seed)
200
201extern int   	     kernel_sendmsg(struct socket *sock, struct msghdr *msg,
202				    struct kvec *vec, size_t num, size_t len);
203extern int   	     kernel_recvmsg(struct socket *sock, struct msghdr *msg,
204				    struct kvec *vec, size_t num,
205				    size_t len, int flags);
206
207extern int kernel_bind(struct socket *sock, struct sockaddr *addr,
208		       int addrlen);
209extern int kernel_listen(struct socket *sock, int backlog);
210extern int kernel_accept(struct socket *sock, struct socket **newsock,
211			 int flags);
212extern int kernel_connect(struct socket *sock, struct sockaddr *addr,
213			  int addrlen, int flags);
214extern int kernel_getsockname(struct socket *sock, struct sockaddr *addr,
215			      int *addrlen);
216extern int kernel_getpeername(struct socket *sock, struct sockaddr *addr,
217			      int *addrlen);
218extern int kernel_getsockopt(struct socket *sock, int level, int optname,
219			     char *optval, int *optlen);
220extern int kernel_setsockopt(struct socket *sock, int level, int optname,
221			     char *optval, int optlen);
222extern int kernel_sendpage(struct socket *sock, struct page *page, int offset,
223			   size_t size, int flags);
224extern int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg);
225
226#ifndef CONFIG_SMP
227#define SOCKOPS_WRAPPED(name) name
228#define SOCKOPS_WRAP(name, fam)
229#else
230
231#define SOCKOPS_WRAPPED(name) __unlocked_##name
232
233#define SOCKCALL_WRAP(name, call, parms, args)		\
234static int __lock_##name##_##call  parms		\
235{							\
236	int ret;					\
237	lock_kernel();					\
238	ret = __unlocked_##name##_ops.call  args ;\
239	unlock_kernel();				\
240	return ret;					\
241}
242
243#define SOCKCALL_UWRAP(name, call, parms, args)		\
244static unsigned int __lock_##name##_##call  parms	\
245{							\
246	int ret;					\
247	lock_kernel();					\
248	ret = __unlocked_##name##_ops.call  args ;\
249	unlock_kernel();				\
250	return ret;					\
251}
252
253
254#define SOCKOPS_WRAP(name, fam)					\
255SOCKCALL_WRAP(name, release, (struct socket *sock), (sock))	\
256SOCKCALL_WRAP(name, bind, (struct socket *sock, struct sockaddr *uaddr, int addr_len), \
257	      (sock, uaddr, addr_len))				\
258SOCKCALL_WRAP(name, connect, (struct socket *sock, struct sockaddr * uaddr, \
259			      int addr_len, int flags), 	\
260	      (sock, uaddr, addr_len, flags))			\
261SOCKCALL_WRAP(name, socketpair, (struct socket *sock1, struct socket *sock2), \
262	      (sock1, sock2))					\
263SOCKCALL_WRAP(name, accept, (struct socket *sock, struct socket *newsock, \
264			 int flags), (sock, newsock, flags)) \
265SOCKCALL_WRAP(name, getname, (struct socket *sock, struct sockaddr *uaddr, \
266			 int *addr_len, int peer), (sock, uaddr, addr_len, peer)) \
267SOCKCALL_UWRAP(name, poll, (struct file *file, struct socket *sock, struct poll_table_struct *wait), \
268	      (file, sock, wait)) \
269SOCKCALL_WRAP(name, ioctl, (struct socket *sock, unsigned int cmd, \
270			 unsigned long arg), (sock, cmd, arg)) \
271SOCKCALL_WRAP(name, compat_ioctl, (struct socket *sock, unsigned int cmd, \
272			 unsigned long arg), (sock, cmd, arg)) \
273SOCKCALL_WRAP(name, listen, (struct socket *sock, int len), (sock, len)) \
274SOCKCALL_WRAP(name, shutdown, (struct socket *sock, int flags), (sock, flags)) \
275SOCKCALL_WRAP(name, setsockopt, (struct socket *sock, int level, int optname, \
276			 char __user *optval, int optlen), (sock, level, optname, optval, optlen)) \
277SOCKCALL_WRAP(name, getsockopt, (struct socket *sock, int level, int optname, \
278			 char __user *optval, int __user *optlen), (sock, level, optname, optval, optlen)) \
279SOCKCALL_WRAP(name, sendmsg, (struct kiocb *iocb, struct socket *sock, struct msghdr *m, size_t len), \
280	      (iocb, sock, m, len)) \
281SOCKCALL_WRAP(name, recvmsg, (struct kiocb *iocb, struct socket *sock, struct msghdr *m, size_t len, int flags), \
282	      (iocb, sock, m, len, flags)) \
283SOCKCALL_WRAP(name, mmap, (struct file *file, struct socket *sock, struct vm_area_struct *vma), \
284	      (file, sock, vma)) \
285	      \
286static const struct proto_ops name##_ops = {			\
287	.family		= fam,				\
288	.owner		= THIS_MODULE,			\
289	.release	= __lock_##name##_release,	\
290	.bind		= __lock_##name##_bind,		\
291	.connect	= __lock_##name##_connect,	\
292	.socketpair	= __lock_##name##_socketpair,	\
293	.accept		= __lock_##name##_accept,	\
294	.getname	= __lock_##name##_getname,	\
295	.poll		= __lock_##name##_poll,		\
296	.ioctl		= __lock_##name##_ioctl,	\
297	.compat_ioctl	= __lock_##name##_compat_ioctl,	\
298	.listen		= __lock_##name##_listen,	\
299	.shutdown	= __lock_##name##_shutdown,	\
300	.setsockopt	= __lock_##name##_setsockopt,	\
301	.getsockopt	= __lock_##name##_getsockopt,	\
302	.sendmsg	= __lock_##name##_sendmsg,	\
303	.recvmsg	= __lock_##name##_recvmsg,	\
304	.mmap		= __lock_##name##_mmap,		\
305};
306
307#endif
308
309#define MODULE_ALIAS_NETPROTO(proto) \
310	MODULE_ALIAS("net-pf-" __stringify(proto))
311
312#define MODULE_ALIAS_NET_PF_PROTO(pf, proto) \
313	MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto))
314
315#ifdef CONFIG_SYSCTL
316#include <linux/sysctl.h>
317extern ctl_table net_table[];
318extern int net_msg_cost;
319extern int net_msg_burst;
320#endif
321
322#endif /* __KERNEL__ */
323#endif	/* _LINUX_NET_H */
324