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 /** 99 * struct socket - general BSD socket 100 * @state: socket state (%SS_CONNECTED, etc) 101 * @flags: socket flags (%SOCK_ASYNC_NOSPACE, etc) 102 * @ops: protocol specific socket operations 103 * @fasync_list: Asynchronous wake up list 104 * @file: File back pointer for gc 105 * @sk: internal networking protocol agnostic socket representation 106 * @wait: wait queue for several uses 107 * @type: socket type (%SOCK_STREAM, etc) 108 */ 109 struct socket { 110 socket_state state; 111 unsigned long flags; 112 const struct proto_ops *ops; 113 struct fasync_struct *fasync_list; 114 struct file *file; 115 struct sock *sk; 116 wait_queue_head_t wait; 117 short type; 118 }; 119 120 struct vm_area_struct; 121 struct page; 122 struct kiocb; 123 struct sockaddr; 124 struct msghdr; 125 struct module; 126 127 struct proto_ops { 128 int family; 129 struct module *owner; 130 int (*release) (struct socket *sock); 131 int (*bind) (struct socket *sock, 132 struct sockaddr *myaddr, 133 int sockaddr_len); 134 int (*connect) (struct socket *sock, 135 struct sockaddr *vaddr, 136 int sockaddr_len, int flags); 137 int (*socketpair)(struct socket *sock1, 138 struct socket *sock2); 139 int (*accept) (struct socket *sock, 140 struct socket *newsock, int flags); 141 int (*getname) (struct socket *sock, 142 struct sockaddr *addr, 143 int *sockaddr_len, int peer); 144 unsigned int (*poll) (struct file *file, struct socket *sock, 145 struct poll_table_struct *wait); 146 int (*ioctl) (struct socket *sock, unsigned int cmd, 147 unsigned long arg); 148 int (*compat_ioctl) (struct socket *sock, unsigned int cmd, 149 unsigned long arg); 150 int (*listen) (struct socket *sock, int len); 151 int (*shutdown) (struct socket *sock, int flags); 152 int (*setsockopt)(struct socket *sock, int level, 153 int optname, char __user *optval, int optlen); 154 int (*getsockopt)(struct socket *sock, int level, 155 int optname, char __user *optval, int __user *optlen); 156 int (*compat_setsockopt)(struct socket *sock, int level, 157 int optname, char __user *optval, int optlen); 158 int (*compat_getsockopt)(struct socket *sock, int level, 159 int optname, char __user *optval, int __user *optlen); 160 int (*sendmsg) (struct kiocb *iocb, struct socket *sock, 161 struct msghdr *m, size_t total_len); 162 int (*recvmsg) (struct kiocb *iocb, struct socket *sock, 163 struct msghdr *m, size_t total_len, 164 int flags); 165 int (*mmap) (struct file *file, struct socket *sock, 166 struct vm_area_struct * vma); 167 ssize_t (*sendpage) (struct socket *sock, struct page *page, 168 int offset, size_t size, int flags); 169 }; 170 171 struct net_proto_family { 172 int family; 173 int (*create)(struct net *net, struct socket *sock, int protocol); 174 struct module *owner; 175 }; 176 177 struct iovec; 178 struct kvec; 179 180 extern int sock_wake_async(struct socket *sk, int how, int band); 181 extern int sock_register(const struct net_proto_family *fam); 182 extern void sock_unregister(int family); 183 extern int sock_create(int family, int type, int proto, 184 struct socket **res); 185 extern int sock_create_kern(int family, int type, int proto, 186 struct socket **res); 187 extern int sock_create_lite(int family, int type, int proto, 188 struct socket **res); 189 extern void sock_release(struct socket *sock); 190 extern int sock_sendmsg(struct socket *sock, struct msghdr *msg, 191 size_t len); 192 extern int sock_recvmsg(struct socket *sock, struct msghdr *msg, 193 size_t size, int flags); 194 extern int sock_map_fd(struct socket *sock); 195 extern struct socket *sockfd_lookup(int fd, int *err); 196 #define sockfd_put(sock) fput(sock->file) 197 extern int net_ratelimit(void); 198 199 #define net_random() random32() 200 #define net_srandom(seed) srandom32((__force u32)seed) 201 202 extern int kernel_sendmsg(struct socket *sock, struct msghdr *msg, 203 struct kvec *vec, size_t num, size_t len); 204 extern int kernel_recvmsg(struct socket *sock, struct msghdr *msg, 205 struct kvec *vec, size_t num, 206 size_t len, int flags); 207 208 extern int kernel_bind(struct socket *sock, struct sockaddr *addr, 209 int addrlen); 210 extern int kernel_listen(struct socket *sock, int backlog); 211 extern int kernel_accept(struct socket *sock, struct socket **newsock, 212 int flags); 213 extern int kernel_connect(struct socket *sock, struct sockaddr *addr, 214 int addrlen, int flags); 215 extern int kernel_getsockname(struct socket *sock, struct sockaddr *addr, 216 int *addrlen); 217 extern int kernel_getpeername(struct socket *sock, struct sockaddr *addr, 218 int *addrlen); 219 extern int kernel_getsockopt(struct socket *sock, int level, int optname, 220 char *optval, int *optlen); 221 extern int kernel_setsockopt(struct socket *sock, int level, int optname, 222 char *optval, int optlen); 223 extern int kernel_sendpage(struct socket *sock, struct page *page, int offset, 224 size_t size, int flags); 225 extern int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg); 226 227 #ifndef CONFIG_SMP 228 #define SOCKOPS_WRAPPED(name) name 229 #define SOCKOPS_WRAP(name, fam) 230 #else 231 232 #define SOCKOPS_WRAPPED(name) __unlocked_##name 233 234 #define SOCKCALL_WRAP(name, call, parms, args) \ 235 static int __lock_##name##_##call parms \ 236 { \ 237 int ret; \ 238 lock_kernel(); \ 239 ret = __unlocked_##name##_ops.call args ;\ 240 unlock_kernel(); \ 241 return ret; \ 242 } 243 244 #define SOCKCALL_UWRAP(name, call, parms, args) \ 245 static unsigned int __lock_##name##_##call parms \ 246 { \ 247 int ret; \ 248 lock_kernel(); \ 249 ret = __unlocked_##name##_ops.call args ;\ 250 unlock_kernel(); \ 251 return ret; \ 252 } 253 254 255 #define SOCKOPS_WRAP(name, fam) \ 256 SOCKCALL_WRAP(name, release, (struct socket *sock), (sock)) \ 257 SOCKCALL_WRAP(name, bind, (struct socket *sock, struct sockaddr *uaddr, int addr_len), \ 258 (sock, uaddr, addr_len)) \ 259 SOCKCALL_WRAP(name, connect, (struct socket *sock, struct sockaddr * uaddr, \ 260 int addr_len, int flags), \ 261 (sock, uaddr, addr_len, flags)) \ 262 SOCKCALL_WRAP(name, socketpair, (struct socket *sock1, struct socket *sock2), \ 263 (sock1, sock2)) \ 264 SOCKCALL_WRAP(name, accept, (struct socket *sock, struct socket *newsock, \ 265 int flags), (sock, newsock, flags)) \ 266 SOCKCALL_WRAP(name, getname, (struct socket *sock, struct sockaddr *uaddr, \ 267 int *addr_len, int peer), (sock, uaddr, addr_len, peer)) \ 268 SOCKCALL_UWRAP(name, poll, (struct file *file, struct socket *sock, struct poll_table_struct *wait), \ 269 (file, sock, wait)) \ 270 SOCKCALL_WRAP(name, ioctl, (struct socket *sock, unsigned int cmd, \ 271 unsigned long arg), (sock, cmd, arg)) \ 272 SOCKCALL_WRAP(name, compat_ioctl, (struct socket *sock, unsigned int cmd, \ 273 unsigned long arg), (sock, cmd, arg)) \ 274 SOCKCALL_WRAP(name, listen, (struct socket *sock, int len), (sock, len)) \ 275 SOCKCALL_WRAP(name, shutdown, (struct socket *sock, int flags), (sock, flags)) \ 276 SOCKCALL_WRAP(name, setsockopt, (struct socket *sock, int level, int optname, \ 277 char __user *optval, int optlen), (sock, level, optname, optval, optlen)) \ 278 SOCKCALL_WRAP(name, getsockopt, (struct socket *sock, int level, int optname, \ 279 char __user *optval, int __user *optlen), (sock, level, optname, optval, optlen)) \ 280 SOCKCALL_WRAP(name, sendmsg, (struct kiocb *iocb, struct socket *sock, struct msghdr *m, size_t len), \ 281 (iocb, sock, m, len)) \ 282 SOCKCALL_WRAP(name, recvmsg, (struct kiocb *iocb, struct socket *sock, struct msghdr *m, size_t len, int flags), \ 283 (iocb, sock, m, len, flags)) \ 284 SOCKCALL_WRAP(name, mmap, (struct file *file, struct socket *sock, struct vm_area_struct *vma), \ 285 (file, sock, vma)) \ 286 \ 287 static const struct proto_ops name##_ops = { \ 288 .family = fam, \ 289 .owner = THIS_MODULE, \ 290 .release = __lock_##name##_release, \ 291 .bind = __lock_##name##_bind, \ 292 .connect = __lock_##name##_connect, \ 293 .socketpair = __lock_##name##_socketpair, \ 294 .accept = __lock_##name##_accept, \ 295 .getname = __lock_##name##_getname, \ 296 .poll = __lock_##name##_poll, \ 297 .ioctl = __lock_##name##_ioctl, \ 298 .compat_ioctl = __lock_##name##_compat_ioctl, \ 299 .listen = __lock_##name##_listen, \ 300 .shutdown = __lock_##name##_shutdown, \ 301 .setsockopt = __lock_##name##_setsockopt, \ 302 .getsockopt = __lock_##name##_getsockopt, \ 303 .sendmsg = __lock_##name##_sendmsg, \ 304 .recvmsg = __lock_##name##_recvmsg, \ 305 .mmap = __lock_##name##_mmap, \ 306 }; 307 308 #endif 309 310 #define MODULE_ALIAS_NETPROTO(proto) \ 311 MODULE_ALIAS("net-pf-" __stringify(proto)) 312 313 #define MODULE_ALIAS_NET_PF_PROTO(pf, proto) \ 314 MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto)) 315 316 #ifdef CONFIG_SYSCTL 317 #include <linux/sysctl.h> 318 extern ctl_table net_table[]; 319 extern int net_msg_cost; 320 extern int net_msg_burst; 321 #endif 322 323 #endif /* __KERNEL__ */ 324 #endif /* _LINUX_NET_H */ 325