• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
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 
24 struct poll_table_struct;
25 struct 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 
47 typedef 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  */
82 enum 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  */
107 struct 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 
118 struct vm_area_struct;
119 struct page;
120 struct kiocb;
121 struct sockaddr;
122 struct msghdr;
123 struct module;
124 
125 struct 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 
169 struct 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 
180 struct iovec;
181 struct kvec;
182 
183 extern int	     sock_wake_async(struct socket *sk, int how, int band);
184 extern int	     sock_register(struct net_proto_family *fam);
185 extern int	     sock_unregister(int family);
186 extern int	     sock_create(int family, int type, int proto,
187 				 struct socket **res);
188 extern int	     sock_create_kern(int family, int type, int proto,
189 				      struct socket **res);
190 extern int	     sock_create_lite(int family, int type, int proto,
191 				      struct socket **res);
192 extern void	     sock_release(struct socket *sock);
193 extern int   	     sock_sendmsg(struct socket *sock, struct msghdr *msg,
194 				  size_t len);
195 extern int	     sock_recvmsg(struct socket *sock, struct msghdr *msg,
196 				  size_t size, int flags);
197 extern int 	     sock_map_fd(struct socket *sock);
198 extern struct socket *sockfd_lookup(int fd, int *err);
199 #define		     sockfd_put(sock) fput(sock->file)
200 extern int	     net_ratelimit(void);
201 extern unsigned long net_random(void);
202 extern void	     net_srandom(unsigned long);
203 extern void	     net_random_init(void);
204 
205 extern int   	     kernel_sendmsg(struct socket *sock, struct msghdr *msg,
206 				    struct kvec *vec, size_t num, size_t len);
207 extern 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)		\
219 static 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)		\
229 static 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)					\
240 SOCKCALL_WRAP(name, release, (struct socket *sock), (sock))	\
241 SOCKCALL_WRAP(name, bind, (struct socket *sock, struct sockaddr *uaddr, int addr_len), \
242 	      (sock, uaddr, addr_len))				\
243 SOCKCALL_WRAP(name, connect, (struct socket *sock, struct sockaddr * uaddr, \
244 			      int addr_len, int flags), 	\
245 	      (sock, uaddr, addr_len, flags))			\
246 SOCKCALL_WRAP(name, socketpair, (struct socket *sock1, struct socket *sock2), \
247 	      (sock1, sock2))					\
248 SOCKCALL_WRAP(name, accept, (struct socket *sock, struct socket *newsock, \
249 			 int flags), (sock, newsock, flags)) \
250 SOCKCALL_WRAP(name, getname, (struct socket *sock, struct sockaddr *uaddr, \
251 			 int *addr_len, int peer), (sock, uaddr, addr_len, peer)) \
252 SOCKCALL_UWRAP(name, poll, (struct file *file, struct socket *sock, struct poll_table_struct *wait), \
253 	      (file, sock, wait)) \
254 SOCKCALL_WRAP(name, ioctl, (struct socket *sock, unsigned int cmd, \
255 			 unsigned long arg), (sock, cmd, arg)) \
256 SOCKCALL_WRAP(name, compat_ioctl, (struct socket *sock, unsigned int cmd, \
257 			 unsigned long arg), (sock, cmd, arg)) \
258 SOCKCALL_WRAP(name, listen, (struct socket *sock, int len), (sock, len)) \
259 SOCKCALL_WRAP(name, shutdown, (struct socket *sock, int flags), (sock, flags)) \
260 SOCKCALL_WRAP(name, setsockopt, (struct socket *sock, int level, int optname, \
261 			 char __user *optval, int optlen), (sock, level, optname, optval, optlen)) \
262 SOCKCALL_WRAP(name, getsockopt, (struct socket *sock, int level, int optname, \
263 			 char __user *optval, int __user *optlen), (sock, level, optname, optval, optlen)) \
264 SOCKCALL_WRAP(name, sendmsg, (struct kiocb *iocb, struct socket *sock, struct msghdr *m, size_t len), \
265 	      (iocb, sock, m, len)) \
266 SOCKCALL_WRAP(name, recvmsg, (struct kiocb *iocb, struct socket *sock, struct msghdr *m, size_t len, int flags), \
267 	      (iocb, sock, m, len, flags)) \
268 SOCKCALL_WRAP(name, mmap, (struct file *file, struct socket *sock, struct vm_area_struct *vma), \
269 	      (file, sock, vma)) \
270 	      \
271 static 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>
302 extern ctl_table net_table[];
303 extern int net_msg_cost;
304 extern int net_msg_burst;
305 #endif
306 
307 #endif /* __KERNEL__ */
308 #endif	/* _LINUX_NET_H */
309