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Linux/include/linux/net.h

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  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/stringify.h>
 22 #include <linux/random.h>
 23 #include <linux/wait.h>
 24 #include <linux/fcntl.h>        /* For O_CLOEXEC and O_NONBLOCK */
 25 #include <linux/kmemcheck.h>
 26 #include <linux/rcupdate.h>
 27 #include <uapi/linux/net.h>
 28 
 29 struct poll_table_struct;
 30 struct pipe_inode_info;
 31 struct inode;
 32 struct file;
 33 struct net;
 34 
 35 #define SOCK_ASYNC_NOSPACE      0
 36 #define SOCK_ASYNC_WAITDATA     1
 37 #define SOCK_NOSPACE            2
 38 #define SOCK_PASSCRED           3
 39 #define SOCK_PASSSEC            4
 40 #define SOCK_EXTERNALLY_ALLOCATED 5
 41 
 42 #ifndef ARCH_HAS_SOCKET_TYPES
 43 /**
 44  * enum sock_type - Socket types
 45  * @SOCK_STREAM: stream (connection) socket
 46  * @SOCK_DGRAM: datagram (conn.less) socket
 47  * @SOCK_RAW: raw socket
 48  * @SOCK_RDM: reliably-delivered message
 49  * @SOCK_SEQPACKET: sequential packet socket
 50  * @SOCK_DCCP: Datagram Congestion Control Protocol socket
 51  * @SOCK_PACKET: linux specific way of getting packets at the dev level.
 52  *                For writing rarp and other similar things on the user level.
 53  *
 54  * When adding some new socket type please
 55  * grep ARCH_HAS_SOCKET_TYPE include/asm-* /socket.h, at least MIPS
 56  * overrides this enum for binary compat reasons.
 57  */
 58 enum sock_type {
 59         SOCK_STREAM     = 1,
 60         SOCK_DGRAM      = 2,
 61         SOCK_RAW        = 3,
 62         SOCK_RDM        = 4,
 63         SOCK_SEQPACKET  = 5,
 64         SOCK_DCCP       = 6,
 65         SOCK_PACKET     = 10,
 66 };
 67 
 68 #define SOCK_MAX (SOCK_PACKET + 1)
 69 /* Mask which covers at least up to SOCK_MASK-1.  The
 70  * remaining bits are used as flags. */
 71 #define SOCK_TYPE_MASK 0xf
 72 
 73 /* Flags for socket, socketpair, accept4 */
 74 #define SOCK_CLOEXEC    O_CLOEXEC
 75 #ifndef SOCK_NONBLOCK
 76 #define SOCK_NONBLOCK   O_NONBLOCK
 77 #endif
 78 
 79 #endif /* ARCH_HAS_SOCKET_TYPES */
 80 
 81 enum sock_shutdown_cmd {
 82         SHUT_RD         = 0,
 83         SHUT_WR         = 1,
 84         SHUT_RDWR       = 2,
 85 };
 86 
 87 struct socket_wq {
 88         /* Note: wait MUST be first field of socket_wq */
 89         wait_queue_head_t       wait;
 90         struct fasync_struct    *fasync_list;
 91         struct rcu_head         rcu;
 92 } ____cacheline_aligned_in_smp;
 93 
 94 /**
 95  *  struct socket - general BSD socket
 96  *  @state: socket state (%SS_CONNECTED, etc)
 97  *  @type: socket type (%SOCK_STREAM, etc)
 98  *  @flags: socket flags (%SOCK_ASYNC_NOSPACE, etc)
 99  *  @ops: protocol specific socket operations
100  *  @file: File back pointer for gc
101  *  @sk: internal networking protocol agnostic socket representation
102  *  @wq: wait queue for several uses
103  */
104 struct socket {
105         socket_state            state;
106 
107         kmemcheck_bitfield_begin(type);
108         short                   type;
109         kmemcheck_bitfield_end(type);
110 
111         unsigned long           flags;
112 
113         struct socket_wq __rcu  *wq;
114 
115         struct file             *file;
116         struct sock             *sk;
117         const struct proto_ops  *ops;
118 };
119 
120 struct vm_area_struct;
121 struct page;
122 struct kiocb;
123 struct sockaddr;
124 struct msghdr;
125 struct module;
126 
127 struct proto_ops {
128         int             family;
129         struct module   *owner;
130         int             (*release)   (struct socket *sock);
131         int             (*bind)      (struct socket *sock,
132                                       struct sockaddr *myaddr,
133                                       int sockaddr_len);
134         int             (*connect)   (struct socket *sock,
135                                       struct sockaddr *vaddr,
136                                       int sockaddr_len, int flags);
137         int             (*socketpair)(struct socket *sock1,
138                                       struct socket *sock2);
139         int             (*accept)    (struct socket *sock,
140                                       struct socket *newsock, int flags);
141         int             (*getname)   (struct socket *sock,
142                                       struct sockaddr *addr,
143                                       int *sockaddr_len, int peer);
144         unsigned int    (*poll)      (struct file *file, struct socket *sock,
145                                       struct poll_table_struct *wait);
146         int             (*ioctl)     (struct socket *sock, unsigned int cmd,
147                                       unsigned long arg);
148 #ifdef CONFIG_COMPAT
149         int             (*compat_ioctl) (struct socket *sock, unsigned int cmd,
150                                       unsigned long arg);
151 #endif
152         int             (*listen)    (struct socket *sock, int len);
153         int             (*shutdown)  (struct socket *sock, int flags);
154         int             (*setsockopt)(struct socket *sock, int level,
155                                       int optname, char __user *optval, unsigned int optlen);
156         int             (*getsockopt)(struct socket *sock, int level,
157                                       int optname, char __user *optval, int __user *optlen);
158 #ifdef CONFIG_COMPAT
159         int             (*compat_setsockopt)(struct socket *sock, int level,
160                                       int optname, char __user *optval, unsigned int optlen);
161         int             (*compat_getsockopt)(struct socket *sock, int level,
162                                       int optname, char __user *optval, int __user *optlen);
163 #endif
164         int             (*sendmsg)   (struct kiocb *iocb, struct socket *sock,
165                                       struct msghdr *m, size_t total_len);
166         /* Notes for implementing recvmsg:
167          * ===============================
168          * msg->msg_namelen should get updated by the recvmsg handlers
169          * iff msg_name != NULL. It is by default 0 to prevent
170          * returning uninitialized memory to user space.  The recvfrom
171          * handlers can assume that msg.msg_name is either NULL or has
172          * a minimum size of sizeof(struct sockaddr_storage).
173          */
174         int             (*recvmsg)   (struct kiocb *iocb, struct socket *sock,
175                                       struct msghdr *m, size_t total_len,
176                                       int flags);
177         int             (*mmap)      (struct file *file, struct socket *sock,
178                                       struct vm_area_struct * vma);
179         ssize_t         (*sendpage)  (struct socket *sock, struct page *page,
180                                       int offset, size_t size, int flags);
181         ssize_t         (*splice_read)(struct socket *sock,  loff_t *ppos,
182                                        struct pipe_inode_info *pipe, size_t len, unsigned int flags);
183         int             (*set_peek_off)(struct sock *sk, int val);
184 };
185 
186 #define DECLARE_SOCKADDR(type, dst, src)        \
187         type dst = ({ __sockaddr_check_size(sizeof(*dst)); (type) src; })
188 
189 struct net_proto_family {
190         int             family;
191         int             (*create)(struct net *net, struct socket *sock,
192                                   int protocol, int kern);
193         struct module   *owner;
194 };
195 
196 struct iovec;
197 struct kvec;
198 
199 enum {
200         SOCK_WAKE_IO,
201         SOCK_WAKE_WAITD,
202         SOCK_WAKE_SPACE,
203         SOCK_WAKE_URG,
204 };
205 
206 extern int           sock_wake_async(struct socket *sk, int how, int band);
207 extern int           sock_register(const struct net_proto_family *fam);
208 extern void          sock_unregister(int family);
209 extern int           __sock_create(struct net *net, int family, int type, int proto,
210                                  struct socket **res, int kern);
211 extern int           sock_create(int family, int type, int proto,
212                                  struct socket **res);
213 extern int           sock_create_kern(int family, int type, int proto,
214                                       struct socket **res);
215 extern int           sock_create_lite(int family, int type, int proto,
216                                       struct socket **res); 
217 extern void          sock_release(struct socket *sock);
218 extern int           sock_sendmsg(struct socket *sock, struct msghdr *msg,
219                                   size_t len);
220 extern int           sock_recvmsg(struct socket *sock, struct msghdr *msg,
221                                   size_t size, int flags);
222 extern struct file  *sock_alloc_file(struct socket *sock, int flags, const char *dname);
223 extern struct socket *sockfd_lookup(int fd, int *err);
224 extern struct socket *sock_from_file(struct file *file, int *err);
225 #define              sockfd_put(sock) fput(sock->file)
226 extern int           net_ratelimit(void);
227 
228 #define net_ratelimited_function(function, ...)                 \
229 do {                                                            \
230         if (net_ratelimit())                                    \
231                 function(__VA_ARGS__);                          \
232 } while (0)
233 
234 #define net_emerg_ratelimited(fmt, ...)                         \
235         net_ratelimited_function(pr_emerg, fmt, ##__VA_ARGS__)
236 #define net_alert_ratelimited(fmt, ...)                         \
237         net_ratelimited_function(pr_alert, fmt, ##__VA_ARGS__)
238 #define net_crit_ratelimited(fmt, ...)                          \
239         net_ratelimited_function(pr_crit, fmt, ##__VA_ARGS__)
240 #define net_err_ratelimited(fmt, ...)                           \
241         net_ratelimited_function(pr_err, fmt, ##__VA_ARGS__)
242 #define net_notice_ratelimited(fmt, ...)                        \
243         net_ratelimited_function(pr_notice, fmt, ##__VA_ARGS__)
244 #define net_warn_ratelimited(fmt, ...)                          \
245         net_ratelimited_function(pr_warn, fmt, ##__VA_ARGS__)
246 #define net_info_ratelimited(fmt, ...)                          \
247         net_ratelimited_function(pr_info, fmt, ##__VA_ARGS__)
248 #define net_dbg_ratelimited(fmt, ...)                           \
249         net_ratelimited_function(pr_debug, fmt, ##__VA_ARGS__)
250 
251 #define net_random()            prandom_u32()
252 #define net_srandom(seed)       prandom_seed((__force u32)(seed))
253 
254 extern int           kernel_sendmsg(struct socket *sock, struct msghdr *msg,
255                                     struct kvec *vec, size_t num, size_t len);
256 extern int           kernel_recvmsg(struct socket *sock, struct msghdr *msg,
257                                     struct kvec *vec, size_t num,
258                                     size_t len, int flags);
259 
260 extern int kernel_bind(struct socket *sock, struct sockaddr *addr,
261                        int addrlen);
262 extern int kernel_listen(struct socket *sock, int backlog);
263 extern int kernel_accept(struct socket *sock, struct socket **newsock,
264                          int flags);
265 extern int kernel_connect(struct socket *sock, struct sockaddr *addr,
266                           int addrlen, int flags);
267 extern int kernel_getsockname(struct socket *sock, struct sockaddr *addr,
268                               int *addrlen);
269 extern int kernel_getpeername(struct socket *sock, struct sockaddr *addr,
270                               int *addrlen);
271 extern int kernel_getsockopt(struct socket *sock, int level, int optname,
272                              char *optval, int *optlen);
273 extern int kernel_setsockopt(struct socket *sock, int level, int optname,
274                              char *optval, unsigned int optlen);
275 extern int kernel_sendpage(struct socket *sock, struct page *page, int offset,
276                            size_t size, int flags);
277 extern int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg);
278 extern int kernel_sock_shutdown(struct socket *sock,
279                                 enum sock_shutdown_cmd how);
280 
281 #define MODULE_ALIAS_NETPROTO(proto) \
282         MODULE_ALIAS("net-pf-" __stringify(proto))
283 
284 #define MODULE_ALIAS_NET_PF_PROTO(pf, proto) \
285         MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto))
286 
287 #define MODULE_ALIAS_NET_PF_PROTO_TYPE(pf, proto, type) \
288         MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto) \
289                      "-type-" __stringify(type))
290 
291 #define MODULE_ALIAS_NET_PF_PROTO_NAME(pf, proto, name) \
292         MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto) \
293                      name)
294 #endif  /* _LINUX_NET_H */
295 

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