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