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, <[email protected]> 10 * Ross Biro 11 * Fred N. van Kempen, <[email protected]> 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 <linux/socket.h> 23 #include <asm/socket.h> 24 25 struct poll_table_struct; 26 struct pipe_inode_info; 27 struct inode; 28 struct net; 29 30 #define NPROTO AF_MAX 31 32 #define SYS_SOCKET 1 /* sys_socket(2) */ 33 #define SYS_BIND 2 /* sys_bind(2) */ 34 #define SYS_CONNECT 3 /* sys_connect(2) */ 35 #define SYS_LISTEN 4 /* sys_listen(2) */ 36 #define SYS_ACCEPT 5 /* sys_accept(2) */ 37 #define SYS_GETSOCKNAME 6 /* sys_getsockname(2) */ 38 #define SYS_GETPEERNAME 7 /* sys_getpeername(2) */ 39 #define SYS_SOCKETPAIR 8 /* sys_socketpair(2) */ 40 #define SYS_SEND 9 /* sys_send(2) */ 41 #define SYS_RECV 10 /* sys_recv(2) */ 42 #define SYS_SENDTO 11 /* sys_sendto(2) */ 43 #define SYS_RECVFROM 12 /* sys_recvfrom(2) */ 44 #define SYS_SHUTDOWN 13 /* sys_shutdown(2) */ 45 #define SYS_SETSOCKOPT 14 /* sys_setsockopt(2) */ 46 #define SYS_GETSOCKOPT 15 /* sys_getsockopt(2) */ 47 #define SYS_SENDMSG 16 /* sys_sendmsg(2) */ 48 #define SYS_RECVMSG 17 /* sys_recvmsg(2) */ 49 50 typedef enum { 51 SS_FREE = 0, /* not allocated */ 52 SS_UNCONNECTED, /* unconnected to any socket */ 53 SS_CONNECTING, /* in process of connecting */ 54 SS_CONNECTED, /* connected to socket */ 55 SS_DISCONNECTING /* in process of disconnecting */ 56 } socket_state; 57 58 #define __SO_ACCEPTCON (1 << 16) /* performed a listen */ 59 60 #ifdef __KERNEL__ 61 #include <linux/stringify.h> 62 #include <linux/random.h> 63 64 #define SOCK_ASYNC_NOSPACE 0 65 #define SOCK_ASYNC_WAITDATA 1 66 #define SOCK_NOSPACE 2 67 #define SOCK_PASSCRED 3 68 #define SOCK_PASSSEC 4 69 70 #ifndef ARCH_HAS_SOCKET_TYPES 71 /** 72 * enum sock_type - Socket types 73 * @SOCK_STREAM: stream (connection) socket 74 * @SOCK_DGRAM: datagram (conn.less) socket 75 * @SOCK_RAW: raw socket 76 * @SOCK_RDM: reliably-delivered message 77 * @SOCK_SEQPACKET: sequential packet socket 78 * @SOCK_DCCP: Datagram Congestion Control Protocol socket 79 * @SOCK_PACKET: linux specific way of getting packets at the dev level. 80 * For writing rarp and other similar things on the user level. 81 * 82 * When adding some new socket type please 83 * grep ARCH_HAS_SOCKET_TYPE include/asm-* /socket.h, at least MIPS 84 * overrides this enum for binary compat reasons. 85 */ 86 enum sock_type { 87 SOCK_STREAM = 1, 88 SOCK_DGRAM = 2, 89 SOCK_RAW = 3, 90 SOCK_RDM = 4, 91 SOCK_SEQPACKET = 5, 92 SOCK_DCCP = 6, 93 SOCK_PACKET = 10, 94 }; 95 96 #define SOCK_MAX (SOCK_PACKET + 1) 97 98 #endif /* ARCH_HAS_SOCKET_TYPES */ 99 100 enum sock_shutdown_cmd { 101 SHUT_RD = 0, 102 SHUT_WR = 1, 103 SHUT_RDWR = 2, 104 }; 105 106 /** 107 * struct socket - general BSD socket 108 * @state: socket state (%SS_CONNECTED, etc) 109 * @flags: socket flags (%SOCK_ASYNC_NOSPACE, etc) 110 * @ops: protocol specific socket operations 111 * @fasync_list: Asynchronous wake up list 112 * @file: File back pointer for gc 113 * @sk: internal networking protocol agnostic socket representation 114 * @wait: wait queue for several uses 115 * @type: socket type (%SOCK_STREAM, etc) 116 */ 117 struct socket { 118 socket_state state; 119 unsigned long flags; 120 const struct proto_ops *ops; 121 struct fasync_struct *fasync_list; 122 struct file *file; 123 struct sock *sk; 124 wait_queue_head_t wait; 125 short type; 126 }; 127 128 struct vm_area_struct; 129 struct page; 130 struct kiocb; 131 struct sockaddr; 132 struct msghdr; 133 struct module; 134 135 struct proto_ops { 136 int family; 137 struct module *owner; 138 int (*release) (struct socket *sock); 139 int (*bind) (struct socket *sock, 140 struct sockaddr *myaddr, 141 int sockaddr_len); 142 int (*connect) (struct socket *sock, 143 struct sockaddr *vaddr, 144 int sockaddr_len, int flags); 145 int (*socketpair)(struct socket *sock1, 146 struct socket *sock2); 147 int (*accept) (struct socket *sock, 148 struct socket *newsock, int flags); 149 int (*getname) (struct socket *sock, 150 struct sockaddr *addr, 151 int *sockaddr_len, int peer); 152 unsigned int (*poll) (struct file *file, struct socket *sock, 153 struct poll_table_struct *wait); 154 int (*ioctl) (struct socket *sock, unsigned int cmd, 155 unsigned long arg); 156 int (*compat_ioctl) (struct socket *sock, unsigned int cmd, 157 unsigned long arg); 158 int (*listen) (struct socket *sock, int len); 159 int (*shutdown) (struct socket *sock, int flags); 160 int (*setsockopt)(struct socket *sock, int level, 161 int optname, char __user *optval, int optlen); 162 int (*getsockopt)(struct socket *sock, int level, 163 int optname, char __user *optval, int __user *optlen); 164 int (*compat_setsockopt)(struct socket *sock, int level, 165 int optname, char __user *optval, int optlen); 166 int (*compat_getsockopt)(struct socket *sock, int level, 167 int optname, char __user *optval, int __user *optlen); 168 int (*sendmsg) (struct kiocb *iocb, struct socket *sock, 169 struct msghdr *m, size_t total_len); 170 int (*recvmsg) (struct kiocb *iocb, struct socket *sock, 171 struct msghdr *m, size_t total_len, 172 int flags); 173 int (*mmap) (struct file *file, struct socket *sock, 174 struct vm_area_struct * vma); 175 ssize_t (*sendpage) (struct socket *sock, struct page *page, 176 int offset, size_t size, int flags); 177 ssize_t (*splice_read)(struct socket *sock, loff_t *ppos, 178 struct pipe_inode_info *pipe, size_t len, unsigned int flags); 179 }; 180 181 struct net_proto_family { 182 int family; 183 int (*create)(struct net *net, struct socket *sock, int protocol); 184 struct module *owner; 185 }; 186 187 struct iovec; 188 struct kvec; 189 190 enum { 191 SOCK_WAKE_IO, 192 SOCK_WAKE_WAITD, 193 SOCK_WAKE_SPACE, 194 SOCK_WAKE_URG, 195 }; 196 197 extern int sock_wake_async(struct socket *sk, int how, int band); 198 extern int sock_register(const struct net_proto_family *fam); 199 extern void sock_unregister(int family); 200 extern int sock_create(int family, int type, int proto, 201 struct socket **res); 202 extern int sock_create_kern(int family, int type, int proto, 203 struct socket **res); 204 extern int sock_create_lite(int family, int type, int proto, 205 struct socket **res); 206 extern void sock_release(struct socket *sock); 207 extern int sock_sendmsg(struct socket *sock, struct msghdr *msg, 208 size_t len); 209 extern int sock_recvmsg(struct socket *sock, struct msghdr *msg, 210 size_t size, int flags); 211 extern int sock_map_fd(struct socket *sock); 212 extern struct socket *sockfd_lookup(int fd, int *err); 213 #define sockfd_put(sock) fput(sock->file) 214 extern int net_ratelimit(void); 215 216 #define net_random() random32() 217 #define net_srandom(seed) srandom32((__force u32)seed) 218 219 extern int kernel_sendmsg(struct socket *sock, struct msghdr *msg, 220 struct kvec *vec, size_t num, size_t len); 221 extern int kernel_recvmsg(struct socket *sock, struct msghdr *msg, 222 struct kvec *vec, size_t num, 223 size_t len, int flags); 224 225 extern int kernel_bind(struct socket *sock, struct sockaddr *addr, 226 int addrlen); 227 extern int kernel_listen(struct socket *sock, int backlog); 228 extern int kernel_accept(struct socket *sock, struct socket **newsock, 229 int flags); 230 extern int kernel_connect(struct socket *sock, struct sockaddr *addr, 231 int addrlen, int flags); 232 extern int kernel_getsockname(struct socket *sock, struct sockaddr *addr, 233 int *addrlen); 234 extern int kernel_getpeername(struct socket *sock, struct sockaddr *addr, 235 int *addrlen); 236 extern int kernel_getsockopt(struct socket *sock, int level, int optname, 237 char *optval, int *optlen); 238 extern int kernel_setsockopt(struct socket *sock, int level, int optname, 239 char *optval, int optlen); 240 extern int kernel_sendpage(struct socket *sock, struct page *page, int offset, 241 size_t size, int flags); 242 extern int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg); 243 extern int kernel_sock_shutdown(struct socket *sock, 244 enum sock_shutdown_cmd how); 245 246 #ifndef CONFIG_SMP 247 #define SOCKOPS_WRAPPED(name) name 248 #define SOCKOPS_WRAP(name, fam) 249 #else 250 251 #define SOCKOPS_WRAPPED(name) __unlocked_##name 252 253 #define SOCKCALL_WRAP(name, call, parms, args) \ 254 static int __lock_##name##_##call parms \ 255 { \ 256 int ret; \ 257 lock_kernel(); \ 258 ret = __unlocked_##name##_ops.call args ;\ 259 unlock_kernel(); \ 260 return ret; \ 261 } 262 263 #define SOCKCALL_UWRAP(name, call, parms, args) \ 264 static unsigned int __lock_##name##_##call parms \ 265 { \ 266 int ret; \ 267 lock_kernel(); \ 268 ret = __unlocked_##name##_ops.call args ;\ 269 unlock_kernel(); \ 270 return ret; \ 271 } 272 273 274 #define SOCKOPS_WRAP(name, fam) \ 275 SOCKCALL_WRAP(name, release, (struct socket *sock), (sock)) \ 276 SOCKCALL_WRAP(name, bind, (struct socket *sock, struct sockaddr *uaddr, int addr_len), \ 277 (sock, uaddr, addr_len)) \ 278 SOCKCALL_WRAP(name, connect, (struct socket *sock, struct sockaddr * uaddr, \ 279 int addr_len, int flags), \ 280 (sock, uaddr, addr_len, flags)) \ 281 SOCKCALL_WRAP(name, socketpair, (struct socket *sock1, struct socket *sock2), \ 282 (sock1, sock2)) \ 283 SOCKCALL_WRAP(name, accept, (struct socket *sock, struct socket *newsock, \ 284 int flags), (sock, newsock, flags)) \ 285 SOCKCALL_WRAP(name, getname, (struct socket *sock, struct sockaddr *uaddr, \ 286 int *addr_len, int peer), (sock, uaddr, addr_len, peer)) \ 287 SOCKCALL_UWRAP(name, poll, (struct file *file, struct socket *sock, struct poll_table_struct *wait), \ 288 (file, sock, wait)) \ 289 SOCKCALL_WRAP(name, ioctl, (struct socket *sock, unsigned int cmd, \ 290 unsigned long arg), (sock, cmd, arg)) \ 291 SOCKCALL_WRAP(name, compat_ioctl, (struct socket *sock, unsigned int cmd, \ 292 unsigned long arg), (sock, cmd, arg)) \ 293 SOCKCALL_WRAP(name, listen, (struct socket *sock, int len), (sock, len)) \ 294 SOCKCALL_WRAP(name, shutdown, (struct socket *sock, int flags), (sock, flags)) \ 295 SOCKCALL_WRAP(name, setsockopt, (struct socket *sock, int level, int optname, \ 296 char __user *optval, int optlen), (sock, level, optname, optval, optlen)) \ 297 SOCKCALL_WRAP(name, getsockopt, (struct socket *sock, int level, int optname, \ 298 char __user *optval, int __user *optlen), (sock, level, optname, optval, optlen)) \ 299 SOCKCALL_WRAP(name, sendmsg, (struct kiocb *iocb, struct socket *sock, struct msghdr *m, size_t len), \ 300 (iocb, sock, m, len)) \ 301 SOCKCALL_WRAP(name, recvmsg, (struct kiocb *iocb, struct socket *sock, struct msghdr *m, size_t len, int flags), \ 302 (iocb, sock, m, len, flags)) \ 303 SOCKCALL_WRAP(name, mmap, (struct file *file, struct socket *sock, struct vm_area_struct *vma), \ 304 (file, sock, vma)) \ 305 \ 306 static const struct proto_ops name##_ops = { \ 307 .family = fam, \ 308 .owner = THIS_MODULE, \ 309 .release = __lock_##name##_release, \ 310 .bind = __lock_##name##_bind, \ 311 .connect = __lock_##name##_connect, \ 312 .socketpair = __lock_##name##_socketpair, \ 313 .accept = __lock_##name##_accept, \ 314 .getname = __lock_##name##_getname, \ 315 .poll = __lock_##name##_poll, \ 316 .ioctl = __lock_##name##_ioctl, \ 317 .compat_ioctl = __lock_##name##_compat_ioctl, \ 318 .listen = __lock_##name##_listen, \ 319 .shutdown = __lock_##name##_shutdown, \ 320 .setsockopt = __lock_##name##_setsockopt, \ 321 .getsockopt = __lock_##name##_getsockopt, \ 322 .sendmsg = __lock_##name##_sendmsg, \ 323 .recvmsg = __lock_##name##_recvmsg, \ 324 .mmap = __lock_##name##_mmap, \ 325 }; 326 327 #endif 328 329 #define MODULE_ALIAS_NETPROTO(proto) \ 330 MODULE_ALIAS("net-pf-" __stringify(proto)) 331 332 #define MODULE_ALIAS_NET_PF_PROTO(pf, proto) \ 333 MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto)) 334 335 #define MODULE_ALIAS_NET_PF_PROTO_TYPE(pf, proto, type) \ 336 MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto) \ 337 "-type-" __stringify(type)) 338 339 #ifdef CONFIG_SYSCTL 340 #include <linux/sysctl.h> 341 extern int net_msg_cost; 342 extern int net_msg_burst; 343 #endif 344 345 #endif /* __KERNEL__ */ 346 #endif /* _LINUX_NET_H */ 347