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/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 const struct proto_ops *ops; 133 struct fasync_struct *fasync_list; 134 struct file *file; 135 struct sock *sk; 136 wait_queue_head_t wait; 137 }; 138 139 struct vm_area_struct; 140 struct page; 141 struct kiocb; 142 struct sockaddr; 143 struct msghdr; 144 struct module; 145 146 struct proto_ops { 147 int family; 148 struct module *owner; 149 int (*release) (struct socket *sock); 150 int (*bind) (struct socket *sock, 151 struct sockaddr *myaddr, 152 int sockaddr_len); 153 int (*connect) (struct socket *sock, 154 struct sockaddr *vaddr, 155 int sockaddr_len, int flags); 156 int (*socketpair)(struct socket *sock1, 157 struct socket *sock2); 158 int (*accept) (struct socket *sock, 159 struct socket *newsock, int flags); 160 int (*getname) (struct socket *sock, 161 struct sockaddr *addr, 162 int *sockaddr_len, int peer); 163 unsigned int (*poll) (struct file *file, struct socket *sock, 164 struct poll_table_struct *wait); 165 int (*ioctl) (struct socket *sock, unsigned int cmd, 166 unsigned long arg); 167 int (*compat_ioctl) (struct socket *sock, unsigned int cmd, 168 unsigned long arg); 169 int (*listen) (struct socket *sock, int len); 170 int (*shutdown) (struct socket *sock, int flags); 171 int (*setsockopt)(struct socket *sock, int level, 172 int optname, char __user *optval, int optlen); 173 int (*getsockopt)(struct socket *sock, int level, 174 int optname, char __user *optval, int __user *optlen); 175 int (*compat_setsockopt)(struct socket *sock, int level, 176 int optname, char __user *optval, int optlen); 177 int (*compat_getsockopt)(struct socket *sock, int level, 178 int optname, char __user *optval, int __user *optlen); 179 int (*sendmsg) (struct kiocb *iocb, struct socket *sock, 180 struct msghdr *m, size_t total_len); 181 int (*recvmsg) (struct kiocb *iocb, struct socket *sock, 182 struct msghdr *m, size_t total_len, 183 int flags); 184 int (*mmap) (struct file *file, struct socket *sock, 185 struct vm_area_struct * vma); 186 ssize_t (*sendpage) (struct socket *sock, struct page *page, 187 int offset, size_t size, int flags); 188 ssize_t (*splice_read)(struct socket *sock, loff_t *ppos, 189 struct pipe_inode_info *pipe, size_t len, unsigned int flags); 190 }; 191 192 struct net_proto_family { 193 int family; 194 int (*create)(struct net *net, struct socket *sock, int protocol); 195 struct module *owner; 196 }; 197 198 struct iovec; 199 struct kvec; 200 201 enum { 202 SOCK_WAKE_IO, 203 SOCK_WAKE_WAITD, 204 SOCK_WAKE_SPACE, 205 SOCK_WAKE_URG, 206 }; 207 208 extern int sock_wake_async(struct socket *sk, int how, int band); 209 extern int sock_register(const struct net_proto_family *fam); 210 extern void sock_unregister(int family); 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 int sock_map_fd(struct socket *sock, int flags); 223 extern struct socket *sockfd_lookup(int fd, int *err); 224 #define sockfd_put(sock) fput(sock->file) 225 extern int net_ratelimit(void); 226 227 #define net_random() random32() 228 #define net_srandom(seed) srandom32((__force u32)seed) 229 230 extern int kernel_sendmsg(struct socket *sock, struct msghdr *msg, 231 struct kvec *vec, size_t num, size_t len); 232 extern int kernel_recvmsg(struct socket *sock, struct msghdr *msg, 233 struct kvec *vec, size_t num, 234 size_t len, int flags); 235 236 extern int kernel_bind(struct socket *sock, struct sockaddr *addr, 237 int addrlen); 238 extern int kernel_listen(struct socket *sock, int backlog); 239 extern int kernel_accept(struct socket *sock, struct socket **newsock, 240 int flags); 241 extern int kernel_connect(struct socket *sock, struct sockaddr *addr, 242 int addrlen, int flags); 243 extern int kernel_getsockname(struct socket *sock, struct sockaddr *addr, 244 int *addrlen); 245 extern int kernel_getpeername(struct socket *sock, struct sockaddr *addr, 246 int *addrlen); 247 extern int kernel_getsockopt(struct socket *sock, int level, int optname, 248 char *optval, int *optlen); 249 extern int kernel_setsockopt(struct socket *sock, int level, int optname, 250 char *optval, int optlen); 251 extern int kernel_sendpage(struct socket *sock, struct page *page, int offset, 252 size_t size, int flags); 253 extern int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg); 254 extern int kernel_sock_shutdown(struct socket *sock, 255 enum sock_shutdown_cmd how); 256 257 #ifndef CONFIG_SMP 258 #define SOCKOPS_WRAPPED(name) name 259 #define SOCKOPS_WRAP(name, fam) 260 #else 261 262 #define SOCKOPS_WRAPPED(name) __unlocked_##name 263 264 #define SOCKCALL_WRAP(name, call, parms, args) \ 265 static int __lock_##name##_##call parms \ 266 { \ 267 int ret; \ 268 lock_kernel(); \ 269 ret = __unlocked_##name##_ops.call args ;\ 270 unlock_kernel(); \ 271 return ret; \ 272 } 273 274 #define SOCKCALL_UWRAP(name, call, parms, args) \ 275 static unsigned int __lock_##name##_##call parms \ 276 { \ 277 int ret; \ 278 lock_kernel(); \ 279 ret = __unlocked_##name##_ops.call args ;\ 280 unlock_kernel(); \ 281 return ret; \ 282 } 283 284 285 #define SOCKOPS_WRAP(name, fam) \ 286 SOCKCALL_WRAP(name, release, (struct socket *sock), (sock)) \ 287 SOCKCALL_WRAP(name, bind, (struct socket *sock, struct sockaddr *uaddr, int addr_len), \ 288 (sock, uaddr, addr_len)) \ 289 SOCKCALL_WRAP(name, connect, (struct socket *sock, struct sockaddr * uaddr, \ 290 int addr_len, int flags), \ 291 (sock, uaddr, addr_len, flags)) \ 292 SOCKCALL_WRAP(name, socketpair, (struct socket *sock1, struct socket *sock2), \ 293 (sock1, sock2)) \ 294 SOCKCALL_WRAP(name, accept, (struct socket *sock, struct socket *newsock, \ 295 int flags), (sock, newsock, flags)) \ 296 SOCKCALL_WRAP(name, getname, (struct socket *sock, struct sockaddr *uaddr, \ 297 int *addr_len, int peer), (sock, uaddr, addr_len, peer)) \ 298 SOCKCALL_UWRAP(name, poll, (struct file *file, struct socket *sock, struct poll_table_struct *wait), \ 299 (file, sock, wait)) \ 300 SOCKCALL_WRAP(name, ioctl, (struct socket *sock, unsigned int cmd, \ 301 unsigned long arg), (sock, cmd, arg)) \ 302 SOCKCALL_WRAP(name, compat_ioctl, (struct socket *sock, unsigned int cmd, \ 303 unsigned long arg), (sock, cmd, arg)) \ 304 SOCKCALL_WRAP(name, listen, (struct socket *sock, int len), (sock, len)) \ 305 SOCKCALL_WRAP(name, shutdown, (struct socket *sock, int flags), (sock, flags)) \ 306 SOCKCALL_WRAP(name, setsockopt, (struct socket *sock, int level, int optname, \ 307 char __user *optval, int optlen), (sock, level, optname, optval, optlen)) \ 308 SOCKCALL_WRAP(name, getsockopt, (struct socket *sock, int level, int optname, \ 309 char __user *optval, int __user *optlen), (sock, level, optname, optval, optlen)) \ 310 SOCKCALL_WRAP(name, sendmsg, (struct kiocb *iocb, struct socket *sock, struct msghdr *m, size_t len), \ 311 (iocb, sock, m, len)) \ 312 SOCKCALL_WRAP(name, recvmsg, (struct kiocb *iocb, struct socket *sock, struct msghdr *m, size_t len, int flags), \ 313 (iocb, sock, m, len, flags)) \ 314 SOCKCALL_WRAP(name, mmap, (struct file *file, struct socket *sock, struct vm_area_struct *vma), \ 315 (file, sock, vma)) \ 316 \ 317 static const struct proto_ops name##_ops = { \ 318 .family = fam, \ 319 .owner = THIS_MODULE, \ 320 .release = __lock_##name##_release, \ 321 .bind = __lock_##name##_bind, \ 322 .connect = __lock_##name##_connect, \ 323 .socketpair = __lock_##name##_socketpair, \ 324 .accept = __lock_##name##_accept, \ 325 .getname = __lock_##name##_getname, \ 326 .poll = __lock_##name##_poll, \ 327 .ioctl = __lock_##name##_ioctl, \ 328 .compat_ioctl = __lock_##name##_compat_ioctl, \ 329 .listen = __lock_##name##_listen, \ 330 .shutdown = __lock_##name##_shutdown, \ 331 .setsockopt = __lock_##name##_setsockopt, \ 332 .getsockopt = __lock_##name##_getsockopt, \ 333 .sendmsg = __lock_##name##_sendmsg, \ 334 .recvmsg = __lock_##name##_recvmsg, \ 335 .mmap = __lock_##name##_mmap, \ 336 }; 337 338 #endif 339 340 #define MODULE_ALIAS_NETPROTO(proto) \ 341 MODULE_ALIAS("net-pf-" __stringify(proto)) 342 343 #define MODULE_ALIAS_NET_PF_PROTO(pf, proto) \ 344 MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto)) 345 346 #define MODULE_ALIAS_NET_PF_PROTO_TYPE(pf, proto, type) \ 347 MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto) \ 348 "-type-" __stringify(type)) 349 350 #ifdef CONFIG_SYSCTL 351 #include <linux/sysctl.h> 352 extern struct ratelimit_state net_ratelimit_state; 353 #endif 354 355 #endif /* __KERNEL__ */ 356 #endif /* _LINUX_NET_H */ 357