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 #include <linux/kmemcheck.h> 61 62 struct poll_table_struct; 63 struct pipe_inode_info; 64 struct inode; 65 struct net; 66 67 #define SOCK_ASYNC_NOSPACE 0 68 #define SOCK_ASYNC_WAITDATA 1 69 #define SOCK_NOSPACE 2 70 #define SOCK_PASSCRED 3 71 #define SOCK_PASSSEC 4 72 73 #ifndef ARCH_HAS_SOCKET_TYPES 74 /** 75 * enum sock_type - Socket types 76 * @SOCK_STREAM: stream (connection) socket 77 * @SOCK_DGRAM: datagram (conn.less) socket 78 * @SOCK_RAW: raw socket 79 * @SOCK_RDM: reliably-delivered message 80 * @SOCK_SEQPACKET: sequential packet socket 81 * @SOCK_DCCP: Datagram Congestion Control Protocol socket 82 * @SOCK_PACKET: linux specific way of getting packets at the dev level. 83 * For writing rarp and other similar things on the user level. 84 * 85 * When adding some new socket type please 86 * grep ARCH_HAS_SOCKET_TYPE include/asm-* /socket.h, at least MIPS 87 * overrides this enum for binary compat reasons. 88 */ 89 enum sock_type { 90 SOCK_STREAM = 1, 91 SOCK_DGRAM = 2, 92 SOCK_RAW = 3, 93 SOCK_RDM = 4, 94 SOCK_SEQPACKET = 5, 95 SOCK_DCCP = 6, 96 SOCK_PACKET = 10, 97 }; 98 99 #define SOCK_MAX (SOCK_PACKET + 1) 100 /* Mask which covers at least up to SOCK_MASK-1. The 101 * remaining bits are used as flags. */ 102 #define SOCK_TYPE_MASK 0xf 103 104 /* Flags for socket, socketpair, accept4 */ 105 #define SOCK_CLOEXEC O_CLOEXEC 106 #ifndef SOCK_NONBLOCK 107 #define SOCK_NONBLOCK O_NONBLOCK 108 #endif 109 110 #endif /* ARCH_HAS_SOCKET_TYPES */ 111 112 enum sock_shutdown_cmd { 113 SHUT_RD = 0, 114 SHUT_WR = 1, 115 SHUT_RDWR = 2, 116 }; 117 118 /** 119 * struct socket - general BSD socket 120 * @state: socket state (%SS_CONNECTED, etc) 121 * @type: socket type (%SOCK_STREAM, etc) 122 * @flags: socket flags (%SOCK_ASYNC_NOSPACE, etc) 123 * @ops: protocol specific socket operations 124 * @fasync_list: Asynchronous wake up list 125 * @file: File back pointer for gc 126 * @sk: internal networking protocol agnostic socket representation 127 * @wait: wait queue for several uses 128 */ 129 struct socket { 130 socket_state state; 131 132 kmemcheck_bitfield_begin(type); 133 short type; 134 kmemcheck_bitfield_end(type); 135 136 unsigned long flags; 137 /* 138 * Please keep fasync_list & wait fields in the same cache line 139 */ 140 struct fasync_struct *fasync_list; 141 wait_queue_head_t wait; 142 143 struct file *file; 144 struct sock *sk; 145 const struct proto_ops *ops; 146 }; 147 148 struct vm_area_struct; 149 struct page; 150 struct kiocb; 151 struct sockaddr; 152 struct msghdr; 153 struct module; 154 155 struct proto_ops { 156 int family; 157 struct module *owner; 158 int (*release) (struct socket *sock); 159 int (*bind) (struct socket *sock, 160 struct sockaddr *myaddr, 161 int sockaddr_len); 162 int (*connect) (struct socket *sock, 163 struct sockaddr *vaddr, 164 int sockaddr_len, int flags); 165 int (*socketpair)(struct socket *sock1, 166 struct socket *sock2); 167 int (*accept) (struct socket *sock, 168 struct socket *newsock, int flags); 169 int (*getname) (struct socket *sock, 170 struct sockaddr *addr, 171 int *sockaddr_len, int peer); 172 unsigned int (*poll) (struct file *file, struct socket *sock, 173 struct poll_table_struct *wait); 174 int (*ioctl) (struct socket *sock, unsigned int cmd, 175 unsigned long arg); 176 int (*compat_ioctl) (struct socket *sock, unsigned int cmd, 177 unsigned long arg); 178 int (*listen) (struct socket *sock, int len); 179 int (*shutdown) (struct socket *sock, int flags); 180 int (*setsockopt)(struct socket *sock, int level, 181 int optname, char __user *optval, unsigned int optlen); 182 int (*getsockopt)(struct socket *sock, int level, 183 int optname, char __user *optval, int __user *optlen); 184 int (*compat_setsockopt)(struct socket *sock, int level, 185 int optname, char __user *optval, unsigned int optlen); 186 int (*compat_getsockopt)(struct socket *sock, int level, 187 int optname, char __user *optval, int __user *optlen); 188 int (*sendmsg) (struct kiocb *iocb, struct socket *sock, 189 struct msghdr *m, size_t total_len); 190 int (*recvmsg) (struct kiocb *iocb, struct socket *sock, 191 struct msghdr *m, size_t total_len, 192 int flags); 193 int (*mmap) (struct file *file, struct socket *sock, 194 struct vm_area_struct * vma); 195 ssize_t (*sendpage) (struct socket *sock, struct page *page, 196 int offset, size_t size, int flags); 197 ssize_t (*splice_read)(struct socket *sock, loff_t *ppos, 198 struct pipe_inode_info *pipe, size_t len, unsigned int flags); 199 }; 200 201 struct net_proto_family { 202 int family; 203 int (*create)(struct net *net, struct socket *sock, int protocol); 204 struct module *owner; 205 }; 206 207 struct iovec; 208 struct kvec; 209 210 enum { 211 SOCK_WAKE_IO, 212 SOCK_WAKE_WAITD, 213 SOCK_WAKE_SPACE, 214 SOCK_WAKE_URG, 215 }; 216 217 extern int sock_wake_async(struct socket *sk, int how, int band); 218 extern int sock_register(const struct net_proto_family *fam); 219 extern void sock_unregister(int family); 220 extern int sock_create(int family, int type, int proto, 221 struct socket **res); 222 extern int sock_create_kern(int family, int type, int proto, 223 struct socket **res); 224 extern int sock_create_lite(int family, int type, int proto, 225 struct socket **res); 226 extern void sock_release(struct socket *sock); 227 extern int sock_sendmsg(struct socket *sock, struct msghdr *msg, 228 size_t len); 229 extern int sock_recvmsg(struct socket *sock, struct msghdr *msg, 230 size_t size, int flags); 231 extern int sock_map_fd(struct socket *sock, int flags); 232 extern struct socket *sockfd_lookup(int fd, int *err); 233 #define sockfd_put(sock) fput(sock->file) 234 extern int net_ratelimit(void); 235 236 #define net_random() random32() 237 #define net_srandom(seed) srandom32((__force u32)seed) 238 239 extern int kernel_sendmsg(struct socket *sock, struct msghdr *msg, 240 struct kvec *vec, size_t num, size_t len); 241 extern int kernel_recvmsg(struct socket *sock, struct msghdr *msg, 242 struct kvec *vec, size_t num, 243 size_t len, int flags); 244 245 extern int kernel_bind(struct socket *sock, struct sockaddr *addr, 246 int addrlen); 247 extern int kernel_listen(struct socket *sock, int backlog); 248 extern int kernel_accept(struct socket *sock, struct socket **newsock, 249 int flags); 250 extern int kernel_connect(struct socket *sock, struct sockaddr *addr, 251 int addrlen, int flags); 252 extern int kernel_getsockname(struct socket *sock, struct sockaddr *addr, 253 int *addrlen); 254 extern int kernel_getpeername(struct socket *sock, struct sockaddr *addr, 255 int *addrlen); 256 extern int kernel_getsockopt(struct socket *sock, int level, int optname, 257 char *optval, int *optlen); 258 extern int kernel_setsockopt(struct socket *sock, int level, int optname, 259 char *optval, unsigned int optlen); 260 extern int kernel_sendpage(struct socket *sock, struct page *page, int offset, 261 size_t size, int flags); 262 extern int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg); 263 extern int kernel_sock_shutdown(struct socket *sock, 264 enum sock_shutdown_cmd how); 265 266 #ifndef CONFIG_SMP 267 #define SOCKOPS_WRAPPED(name) name 268 #define SOCKOPS_WRAP(name, fam) 269 #else 270 271 #define SOCKOPS_WRAPPED(name) __unlocked_##name 272 273 #define SOCKCALL_WRAP(name, call, parms, args) \ 274 static int __lock_##name##_##call parms \ 275 { \ 276 int ret; \ 277 lock_kernel(); \ 278 ret = __unlocked_##name##_ops.call args ;\ 279 unlock_kernel(); \ 280 return ret; \ 281 } 282 283 #define SOCKCALL_UWRAP(name, call, parms, args) \ 284 static unsigned int __lock_##name##_##call parms \ 285 { \ 286 int ret; \ 287 lock_kernel(); \ 288 ret = __unlocked_##name##_ops.call args ;\ 289 unlock_kernel(); \ 290 return ret; \ 291 } 292 293 294 #define SOCKOPS_WRAP(name, fam) \ 295 SOCKCALL_WRAP(name, release, (struct socket *sock), (sock)) \ 296 SOCKCALL_WRAP(name, bind, (struct socket *sock, struct sockaddr *uaddr, int addr_len), \ 297 (sock, uaddr, addr_len)) \ 298 SOCKCALL_WRAP(name, connect, (struct socket *sock, struct sockaddr * uaddr, \ 299 int addr_len, int flags), \ 300 (sock, uaddr, addr_len, flags)) \ 301 SOCKCALL_WRAP(name, socketpair, (struct socket *sock1, struct socket *sock2), \ 302 (sock1, sock2)) \ 303 SOCKCALL_WRAP(name, accept, (struct socket *sock, struct socket *newsock, \ 304 int flags), (sock, newsock, flags)) \ 305 SOCKCALL_WRAP(name, getname, (struct socket *sock, struct sockaddr *uaddr, \ 306 int *addr_len, int peer), (sock, uaddr, addr_len, peer)) \ 307 SOCKCALL_UWRAP(name, poll, (struct file *file, struct socket *sock, struct poll_table_struct *wait), \ 308 (file, sock, wait)) \ 309 SOCKCALL_WRAP(name, ioctl, (struct socket *sock, unsigned int cmd, \ 310 unsigned long arg), (sock, cmd, arg)) \ 311 SOCKCALL_WRAP(name, compat_ioctl, (struct socket *sock, unsigned int cmd, \ 312 unsigned long arg), (sock, cmd, arg)) \ 313 SOCKCALL_WRAP(name, listen, (struct socket *sock, int len), (sock, len)) \ 314 SOCKCALL_WRAP(name, shutdown, (struct socket *sock, int flags), (sock, flags)) \ 315 SOCKCALL_WRAP(name, setsockopt, (struct socket *sock, int level, int optname, \ 316 char __user *optval, unsigned int optlen), (sock, level, optname, optval, optlen)) \ 317 SOCKCALL_WRAP(name, getsockopt, (struct socket *sock, int level, int optname, \ 318 char __user *optval, int __user *optlen), (sock, level, optname, optval, optlen)) \ 319 SOCKCALL_WRAP(name, sendmsg, (struct kiocb *iocb, struct socket *sock, struct msghdr *m, size_t len), \ 320 (iocb, sock, m, len)) \ 321 SOCKCALL_WRAP(name, recvmsg, (struct kiocb *iocb, struct socket *sock, struct msghdr *m, size_t len, int flags), \ 322 (iocb, sock, m, len, flags)) \ 323 SOCKCALL_WRAP(name, mmap, (struct file *file, struct socket *sock, struct vm_area_struct *vma), \ 324 (file, sock, vma)) \ 325 \ 326 static const struct proto_ops name##_ops = { \ 327 .family = fam, \ 328 .owner = THIS_MODULE, \ 329 .release = __lock_##name##_release, \ 330 .bind = __lock_##name##_bind, \ 331 .connect = __lock_##name##_connect, \ 332 .socketpair = __lock_##name##_socketpair, \ 333 .accept = __lock_##name##_accept, \ 334 .getname = __lock_##name##_getname, \ 335 .poll = __lock_##name##_poll, \ 336 .ioctl = __lock_##name##_ioctl, \ 337 .compat_ioctl = __lock_##name##_compat_ioctl, \ 338 .listen = __lock_##name##_listen, \ 339 .shutdown = __lock_##name##_shutdown, \ 340 .setsockopt = __lock_##name##_setsockopt, \ 341 .getsockopt = __lock_##name##_getsockopt, \ 342 .sendmsg = __lock_##name##_sendmsg, \ 343 .recvmsg = __lock_##name##_recvmsg, \ 344 .mmap = __lock_##name##_mmap, \ 345 }; 346 347 #endif 348 349 #define MODULE_ALIAS_NETPROTO(proto) \ 350 MODULE_ALIAS("net-pf-" __stringify(proto)) 351 352 #define MODULE_ALIAS_NET_PF_PROTO(pf, proto) \ 353 MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto)) 354 355 #define MODULE_ALIAS_NET_PF_PROTO_TYPE(pf, proto, type) \ 356 MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto) \ 357 "-type-" __stringify(type)) 358 359 #ifdef CONFIG_SYSCTL 360 #include <linux/sysctl.h> 361 extern struct ratelimit_state net_ratelimit_state; 362 #endif 363 364 #endif /* __KERNEL__ */ 365 #endif /* _LINUX_NET_H */ 366