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/socket.h> 22 #include <asm/socket.h> 23 24 #define NPROTO AF_MAX 25 26 #define SYS_SOCKET 1 /* sys_socket(2) */ 27 #define SYS_BIND 2 /* sys_bind(2) */ 28 #define SYS_CONNECT 3 /* sys_connect(2) */ 29 #define SYS_LISTEN 4 /* sys_listen(2) */ 30 #define SYS_ACCEPT 5 /* sys_accept(2) */ 31 #define SYS_GETSOCKNAME 6 /* sys_getsockname(2) */ 32 #define SYS_GETPEERNAME 7 /* sys_getpeername(2) */ 33 #define SYS_SOCKETPAIR 8 /* sys_socketpair(2) */ 34 #define SYS_SEND 9 /* sys_send(2) */ 35 #define SYS_RECV 10 /* sys_recv(2) */ 36 #define SYS_SENDTO 11 /* sys_sendto(2) */ 37 #define SYS_RECVFROM 12 /* sys_recvfrom(2) */ 38 #define SYS_SHUTDOWN 13 /* sys_shutdown(2) */ 39 #define SYS_SETSOCKOPT 14 /* sys_setsockopt(2) */ 40 #define SYS_GETSOCKOPT 15 /* sys_getsockopt(2) */ 41 #define SYS_SENDMSG 16 /* sys_sendmsg(2) */ 42 #define SYS_RECVMSG 17 /* sys_recvmsg(2) */ 43 #define SYS_ACCEPT4 18 /* sys_accept4(2) */ 44 45 typedef enum { 46 SS_FREE = 0, /* not allocated */ 47 SS_UNCONNECTED, /* unconnected to any socket */ 48 SS_CONNECTING, /* in process of connecting */ 49 SS_CONNECTED, /* connected to socket */ 50 SS_DISCONNECTING /* in process of disconnecting */ 51 } socket_state; 52 53 #define __SO_ACCEPTCON (1 << 16) /* performed a listen */ 54 55 #ifdef __KERNEL__ 56 #include <linux/stringify.h> 57 #include <linux/random.h> 58 #include <linux/wait.h> 59 #include <linux/fcntl.h> /* For O_CLOEXEC and O_NONBLOCK */ 60 61 struct poll_table_struct; 62 struct pipe_inode_info; 63 struct inode; 64 struct net; 65 66 #define SOCK_ASYNC_NOSPACE 0 67 #define SOCK_ASYNC_WAITDATA 1 68 #define SOCK_NOSPACE 2 69 #define SOCK_PASSCRED 3 70 #define SOCK_PASSSEC 4 71 72 #ifndef ARCH_HAS_SOCKET_TYPES 73 /** 74 * enum sock_type - Socket types 75 * @SOCK_STREAM: stream (connection) socket 76 * @SOCK_DGRAM: datagram (conn.less) socket 77 * @SOCK_RAW: raw socket 78 * @SOCK_RDM: reliably-delivered message 79 * @SOCK_SEQPACKET: sequential packet socket 80 * @SOCK_DCCP: Datagram Congestion Control Protocol socket 81 * @SOCK_PACKET: linux specific way of getting packets at the dev level. 82 * For writing rarp and other similar things on the user level. 83 * 84 * When adding some new socket type please 85 * grep ARCH_HAS_SOCKET_TYPE include/asm-* /socket.h, at least MIPS 86 * overrides this enum for binary compat reasons. 87 */ 88 enum sock_type { 89 SOCK_STREAM = 1, 90 SOCK_DGRAM = 2, 91 SOCK_RAW = 3, 92 SOCK_RDM = 4, 93 SOCK_SEQPACKET = 5, 94 SOCK_DCCP = 6, 95 SOCK_PACKET = 10, 96 }; 97 98 #define SOCK_MAX (SOCK_PACKET + 1) 99 /* Mask which covers at least up to SOCK_MASK-1. The 100 * remaining bits are used as flags. */ 101 #define SOCK_TYPE_MASK 0xf 102 103 /* Flags for socket, socketpair, accept4 */ 104 #define SOCK_CLOEXEC O_CLOEXEC 105 #ifndef SOCK_NONBLOCK 106 #define SOCK_NONBLOCK O_NONBLOCK 107 #endif 108 109 #endif /* ARCH_HAS_SOCKET_TYPES */ 110 111 enum sock_shutdown_cmd { 112 SHUT_RD = 0, 113 SHUT_WR = 1, 114 SHUT_RDWR = 2, 115 }; 116 117 /** 118 * struct socket - general BSD socket 119 * @state: socket state (%SS_CONNECTED, etc) 120 * @type: socket type (%SOCK_STREAM, etc) 121 * @flags: socket flags (%SOCK_ASYNC_NOSPACE, etc) 122 * @ops: protocol specific socket operations 123 * @fasync_list: Asynchronous wake up list 124 * @file: File back pointer for gc 125 * @sk: internal networking protocol agnostic socket representation 126 * @wait: wait queue for several uses 127 */ 128 struct socket { 129 socket_state state; 130 short type; 131 unsigned long flags; 132 /* 133 * Please keep fasync_list & wait fields in the same cache line 134 */ 135 struct fasync_struct *fasync_list; 136 wait_queue_head_t wait; 137 138 struct file *file; 139 struct sock *sk; 140 const struct proto_ops *ops; 141 }; 142 143 struct vm_area_struct; 144 struct page; 145 struct kiocb; 146 struct sockaddr; 147 struct msghdr; 148 struct module; 149 150 struct proto_ops { 151 int family; 152 struct module *owner; 153 int (*release) (struct socket *sock); 154 int (*bind) (struct socket *sock, 155 struct sockaddr *myaddr, 156 int sockaddr_len); 157 int (*connect) (struct socket *sock, 158 struct sockaddr *vaddr, 159 int sockaddr_len, int flags); 160 int (*socketpair)(struct socket *sock1, 161 struct socket *sock2); 162 int (*accept) (struct socket *sock, 163 struct socket *newsock, int flags); 164 int (*getname) (struct socket *sock, 165 struct sockaddr *addr, 166 int *sockaddr_len, int peer); 167 unsigned int (*poll) (struct file *file, struct socket *sock, 168 struct poll_table_struct *wait); 169 int (*ioctl) (struct socket *sock, unsigned int cmd, 170 unsigned long arg); 171 int (*compat_ioctl) (struct socket *sock, unsigned int cmd, 172 unsigned long arg); 173 int (*listen) (struct socket *sock, int len); 174 int (*shutdown) (struct socket *sock, int flags); 175 int (*setsockopt)(struct socket *sock, int level, 176 int optname, char __user *optval, int optlen); 177 int (*getsockopt)(struct socket *sock, int level, 178 int optname, char __user *optval, int __user *optlen); 179 int (*compat_setsockopt)(struct socket *sock, int level, 180 int optname, char __user *optval, int optlen); 181 int (*compat_getsockopt)(struct socket *sock, int level, 182 int optname, char __user *optval, int __user *optlen); 183 int (*sendmsg) (struct kiocb *iocb, struct socket *sock, 184 struct msghdr *m, size_t total_len); 185 int (*recvmsg) (struct kiocb *iocb, struct socket *sock, 186 struct msghdr *m, size_t total_len, 187 int flags); 188 int (*mmap) (struct file *file, struct socket *sock, 189 struct vm_area_struct * vma); 190 ssize_t (*sendpage) (struct socket *sock, struct page *page, 191 int offset, size_t size, int flags); 192 ssize_t (*splice_read)(struct socket *sock, loff_t *ppos, 193 struct pipe_inode_info *pipe, size_t len, unsigned int flags); 194 }; 195 196 struct net_proto_family { 197 int family; 198 int (*create)(struct net *net, struct socket *sock, int protocol); 199 struct module *owner; 200 }; 201 202 struct iovec; 203 struct kvec; 204 205 enum { 206 SOCK_WAKE_IO, 207 SOCK_WAKE_WAITD, 208 SOCK_WAKE_SPACE, 209 SOCK_WAKE_URG, 210 }; 211 212 extern int sock_wake_async(struct socket *sk, int how, int band); 213 extern int sock_register(const struct net_proto_family *fam); 214 extern void sock_unregister(int family); 215 extern int sock_create(int family, int type, int proto, 216 struct socket **res); 217 extern int sock_create_kern(int family, int type, int proto, 218 struct socket **res); 219 extern int sock_create_lite(int family, int type, int proto, 220 struct socket **res); 221 extern void sock_release(struct socket *sock); 222 extern int sock_sendmsg(struct socket *sock, struct msghdr *msg, 223 size_t len); 224 extern int sock_recvmsg(struct socket *sock, struct msghdr *msg, 225 size_t size, int flags); 226 extern int sock_map_fd(struct socket *sock, int flags); 227 extern struct socket *sockfd_lookup(int fd, int *err); 228 #define sockfd_put(sock) fput(sock->file) 229 extern int net_ratelimit(void); 230 231 #define net_random() random32() 232 #define net_srandom(seed) srandom32((__force u32)seed) 233 234 extern int kernel_sendmsg(struct socket *sock, struct msghdr *msg, 235 struct kvec *vec, size_t num, size_t len); 236 extern int kernel_recvmsg(struct socket *sock, struct msghdr *msg, 237 struct kvec *vec, size_t num, 238 size_t len, int flags); 239 240 extern int kernel_bind(struct socket *sock, struct sockaddr *addr, 241 int addrlen); 242 extern int kernel_listen(struct socket *sock, int backlog); 243 extern int kernel_accept(struct socket *sock, struct socket **newsock, 244 int flags); 245 extern int kernel_connect(struct socket *sock, struct sockaddr *addr, 246 int addrlen, int flags); 247 extern int kernel_getsockname(struct socket *sock, struct sockaddr *addr, 248 int *addrlen); 249 extern int kernel_getpeername(struct socket *sock, struct sockaddr *addr, 250 int *addrlen); 251 extern int kernel_getsockopt(struct socket *sock, int level, int optname, 252 char *optval, int *optlen); 253 extern int kernel_setsockopt(struct socket *sock, int level, int optname, 254 char *optval, int optlen); 255 extern int kernel_sendpage(struct socket *sock, struct page *page, int offset, 256 size_t size, int flags); 257 extern int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg); 258 extern int kernel_sock_shutdown(struct socket *sock, 259 enum sock_shutdown_cmd how); 260 261 #ifndef CONFIG_SMP 262 #define SOCKOPS_WRAPPED(name) name 263 #define SOCKOPS_WRAP(name, fam) 264 #else 265 266 #define SOCKOPS_WRAPPED(name) __unlocked_##name 267 268 #define SOCKCALL_WRAP(name, call, parms, args) \ 269 static int __lock_##name##_##call parms \ 270 { \ 271 int ret; \ 272 lock_kernel(); \ 273 ret = __unlocked_##name##_ops.call args ;\ 274 unlock_kernel(); \ 275 return ret; \ 276 } 277 278 #define SOCKCALL_UWRAP(name, call, parms, args) \ 279 static unsigned int __lock_##name##_##call parms \ 280 { \ 281 int ret; \ 282 lock_kernel(); \ 283 ret = __unlocked_##name##_ops.call args ;\ 284 unlock_kernel(); \ 285 return ret; \ 286 } 287 288 289 #define SOCKOPS_WRAP(name, fam) \ 290 SOCKCALL_WRAP(name, release, (struct socket *sock), (sock)) \ 291 SOCKCALL_WRAP(name, bind, (struct socket *sock, struct sockaddr *uaddr, int addr_len), \ 292 (sock, uaddr, addr_len)) \ 293 SOCKCALL_WRAP(name, connect, (struct socket *sock, struct sockaddr * uaddr, \ 294 int addr_len, int flags), \ 295 (sock, uaddr, addr_len, flags)) \ 296 SOCKCALL_WRAP(name, socketpair, (struct socket *sock1, struct socket *sock2), \ 297 (sock1, sock2)) \ 298 SOCKCALL_WRAP(name, accept, (struct socket *sock, struct socket *newsock, \ 299 int flags), (sock, newsock, flags)) \ 300 SOCKCALL_WRAP(name, getname, (struct socket *sock, struct sockaddr *uaddr, \ 301 int *addr_len, int peer), (sock, uaddr, addr_len, peer)) \ 302 SOCKCALL_UWRAP(name, poll, (struct file *file, struct socket *sock, struct poll_table_struct *wait), \ 303 (file, sock, wait)) \ 304 SOCKCALL_WRAP(name, ioctl, (struct socket *sock, unsigned int cmd, \ 305 unsigned long arg), (sock, cmd, arg)) \ 306 SOCKCALL_WRAP(name, compat_ioctl, (struct socket *sock, unsigned int cmd, \ 307 unsigned long arg), (sock, cmd, arg)) \ 308 SOCKCALL_WRAP(name, listen, (struct socket *sock, int len), (sock, len)) \ 309 SOCKCALL_WRAP(name, shutdown, (struct socket *sock, int flags), (sock, flags)) \ 310 SOCKCALL_WRAP(name, setsockopt, (struct socket *sock, int level, int optname, \ 311 char __user *optval, int optlen), (sock, level, optname, optval, optlen)) \ 312 SOCKCALL_WRAP(name, getsockopt, (struct socket *sock, int level, int optname, \ 313 char __user *optval, int __user *optlen), (sock, level, optname, optval, optlen)) \ 314 SOCKCALL_WRAP(name, sendmsg, (struct kiocb *iocb, struct socket *sock, struct msghdr *m, size_t len), \ 315 (iocb, sock, m, len)) \ 316 SOCKCALL_WRAP(name, recvmsg, (struct kiocb *iocb, struct socket *sock, struct msghdr *m, size_t len, int flags), \ 317 (iocb, sock, m, len, flags)) \ 318 SOCKCALL_WRAP(name, mmap, (struct file *file, struct socket *sock, struct vm_area_struct *vma), \ 319 (file, sock, vma)) \ 320 \ 321 static const struct proto_ops name##_ops = { \ 322 .family = fam, \ 323 .owner = THIS_MODULE, \ 324 .release = __lock_##name##_release, \ 325 .bind = __lock_##name##_bind, \ 326 .connect = __lock_##name##_connect, \ 327 .socketpair = __lock_##name##_socketpair, \ 328 .accept = __lock_##name##_accept, \ 329 .getname = __lock_##name##_getname, \ 330 .poll = __lock_##name##_poll, \ 331 .ioctl = __lock_##name##_ioctl, \ 332 .compat_ioctl = __lock_##name##_compat_ioctl, \ 333 .listen = __lock_##name##_listen, \ 334 .shutdown = __lock_##name##_shutdown, \ 335 .setsockopt = __lock_##name##_setsockopt, \ 336 .getsockopt = __lock_##name##_getsockopt, \ 337 .sendmsg = __lock_##name##_sendmsg, \ 338 .recvmsg = __lock_##name##_recvmsg, \ 339 .mmap = __lock_##name##_mmap, \ 340 }; 341 342 #endif 343 344 #define MODULE_ALIAS_NETPROTO(proto) \ 345 MODULE_ALIAS("net-pf-" __stringify(proto)) 346 347 #define MODULE_ALIAS_NET_PF_PROTO(pf, proto) \ 348 MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto)) 349 350 #define MODULE_ALIAS_NET_PF_PROTO_TYPE(pf, proto, type) \ 351 MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto) \ 352 "-type-" __stringify(type)) 353 354 #ifdef CONFIG_SYSCTL 355 #include <linux/sysctl.h> 356 extern struct ratelimit_state net_ratelimit_state; 357 #endif 358 359 #endif /* __KERNEL__ */ 360 #endif /* _LINUX_NET_H */ 361