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