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/config.h> 22 #include <linux/wait.h> 23 #include <linux/stringify.h> 24 #include <asm/socket.h> 25 26 struct poll_table_struct; 27 struct inode; 28 29 #define NPROTO 32 /* 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 61 #define SOCK_ASYNC_NOSPACE 0 62 #define SOCK_ASYNC_WAITDATA 1 63 #define SOCK_NOSPACE 2 64 #define SOCK_PASSCRED 3 65 66 #ifndef ARCH_HAS_SOCKET_TYPES 67 /** 68 * enum sock_type - Socket types 69 * @SOCK_STREAM: stream (connection) socket 70 * @SOCK_DGRAM: datagram (conn.less) socket 71 * @SOCK_RAW: raw socket 72 * @SOCK_RDM: reliably-delivered message 73 * @SOCK_SEQPACKET: sequential packet socket 74 * @SOCK_PACKET: linux specific way of getting packets at the dev level. 75 * For writing rarp and other similar things on the user level. 76 * 77 * When adding some new socket type please 78 * grep ARCH_HAS_SOCKET_TYPE include/asm-* /socket.h, at least MIPS 79 * overrides this enum for binary compat reasons. 80 */ 81 enum sock_type { 82 SOCK_STREAM = 1, 83 SOCK_DGRAM = 2, 84 SOCK_RAW = 3, 85 SOCK_RDM = 4, 86 SOCK_SEQPACKET = 5, 87 SOCK_PACKET = 10, 88 }; 89 90 #define SOCK_MAX (SOCK_PACKET + 1) 91 92 #endif /* ARCH_HAS_SOCKET_TYPES */ 93 94 /** 95 * struct socket - general BSD socket 96 * @state: socket state (%SS_CONNECTED, etc) 97 * @flags: socket flags (%SOCK_ASYNC_NOSPACE, etc) 98 * @ops: protocol specific socket operations 99 * @fasync_list: Asynchronous wake up list 100 * @file: File back pointer for gc 101 * @sk: internal networking protocol agnostic socket representation 102 * @wait: wait queue for several uses 103 * @type: socket type (%SOCK_STREAM, etc) 104 */ 105 struct socket { 106 socket_state state; 107 unsigned long flags; 108 struct proto_ops *ops; 109 struct fasync_struct *fasync_list; 110 struct file *file; 111 struct sock *sk; 112 wait_queue_head_t wait; 113 short type; 114 }; 115 116 struct vm_area_struct; 117 struct page; 118 struct kiocb; 119 struct sockaddr; 120 struct msghdr; 121 struct module; 122 123 struct proto_ops { 124 int family; 125 struct module *owner; 126 int (*release) (struct socket *sock); 127 int (*bind) (struct socket *sock, 128 struct sockaddr *myaddr, 129 int sockaddr_len); 130 int (*connect) (struct socket *sock, 131 struct sockaddr *vaddr, 132 int sockaddr_len, int flags); 133 int (*socketpair)(struct socket *sock1, 134 struct socket *sock2); 135 int (*accept) (struct socket *sock, 136 struct socket *newsock, int flags); 137 int (*getname) (struct socket *sock, 138 struct sockaddr *addr, 139 int *sockaddr_len, int peer); 140 unsigned int (*poll) (struct file *file, struct socket *sock, 141 struct poll_table_struct *wait); 142 int (*ioctl) (struct socket *sock, unsigned int cmd, 143 unsigned long arg); 144 int (*listen) (struct socket *sock, int len); 145 int (*shutdown) (struct socket *sock, int flags); 146 int (*setsockopt)(struct socket *sock, int level, 147 int optname, char __user *optval, int optlen); 148 int (*getsockopt)(struct socket *sock, int level, 149 int optname, char __user *optval, int __user *optlen); 150 int (*sendmsg) (struct kiocb *iocb, struct socket *sock, 151 struct msghdr *m, size_t total_len); 152 int (*recvmsg) (struct kiocb *iocb, struct socket *sock, 153 struct msghdr *m, size_t total_len, 154 int flags); 155 int (*mmap) (struct file *file, struct socket *sock, 156 struct vm_area_struct * vma); 157 ssize_t (*sendpage) (struct socket *sock, struct page *page, 158 int offset, size_t size, int flags); 159 }; 160 161 struct net_proto_family { 162 int family; 163 int (*create)(struct socket *sock, int protocol); 164 /* These are counters for the number of different methods of 165 each we support */ 166 short authentication; 167 short encryption; 168 short encrypt_net; 169 struct module *owner; 170 }; 171 172 struct iovec; 173 struct kvec; 174 175 extern int sock_wake_async(struct socket *sk, int how, int band); 176 extern int sock_register(struct net_proto_family *fam); 177 extern int sock_unregister(int family); 178 extern int sock_create(int family, int type, int proto, 179 struct socket **res); 180 extern int sock_create_kern(int family, int type, int proto, 181 struct socket **res); 182 extern int sock_create_lite(int family, int type, int proto, 183 struct socket **res); 184 extern void sock_release(struct socket *sock); 185 extern int sock_sendmsg(struct socket *sock, struct msghdr *msg, 186 size_t len); 187 extern int sock_recvmsg(struct socket *sock, struct msghdr *msg, 188 size_t size, int flags); 189 extern int sock_map_fd(struct socket *sock); 190 extern struct socket *sockfd_lookup(int fd, int *err); 191 #define sockfd_put(sock) fput(sock->file) 192 extern int net_ratelimit(void); 193 extern unsigned long net_random(void); 194 extern void net_srandom(unsigned long); 195 extern void net_random_init(void); 196 197 extern int kernel_sendmsg(struct socket *sock, struct msghdr *msg, 198 struct kvec *vec, size_t num, size_t len); 199 extern int kernel_recvmsg(struct socket *sock, struct msghdr *msg, 200 struct kvec *vec, size_t num, 201 size_t len, int flags); 202 203 #ifndef CONFIG_SMP 204 #define SOCKOPS_WRAPPED(name) name 205 #define SOCKOPS_WRAP(name, fam) 206 #else 207 208 #define SOCKOPS_WRAPPED(name) __unlocked_##name 209 210 #define SOCKCALL_WRAP(name, call, parms, args) \ 211 static int __lock_##name##_##call parms \ 212 { \ 213 int ret; \ 214 lock_kernel(); \ 215 ret = __unlocked_##name##_ops.call args ;\ 216 unlock_kernel(); \ 217 return ret; \ 218 } 219 220 #define SOCKCALL_UWRAP(name, call, parms, args) \ 221 static unsigned int __lock_##name##_##call parms \ 222 { \ 223 int ret; \ 224 lock_kernel(); \ 225 ret = __unlocked_##name##_ops.call args ;\ 226 unlock_kernel(); \ 227 return ret; \ 228 } 229 230 231 #define SOCKOPS_WRAP(name, fam) \ 232 SOCKCALL_WRAP(name, release, (struct socket *sock), (sock)) \ 233 SOCKCALL_WRAP(name, bind, (struct socket *sock, struct sockaddr *uaddr, int addr_len), \ 234 (sock, uaddr, addr_len)) \ 235 SOCKCALL_WRAP(name, connect, (struct socket *sock, struct sockaddr * uaddr, \ 236 int addr_len, int flags), \ 237 (sock, uaddr, addr_len, flags)) \ 238 SOCKCALL_WRAP(name, socketpair, (struct socket *sock1, struct socket *sock2), \ 239 (sock1, sock2)) \ 240 SOCKCALL_WRAP(name, accept, (struct socket *sock, struct socket *newsock, \ 241 int flags), (sock, newsock, flags)) \ 242 SOCKCALL_WRAP(name, getname, (struct socket *sock, struct sockaddr *uaddr, \ 243 int *addr_len, int peer), (sock, uaddr, addr_len, peer)) \ 244 SOCKCALL_UWRAP(name, poll, (struct file *file, struct socket *sock, struct poll_table_struct *wait), \ 245 (file, sock, wait)) \ 246 SOCKCALL_WRAP(name, ioctl, (struct socket *sock, unsigned int cmd, \ 247 unsigned long arg), (sock, cmd, arg)) \ 248 SOCKCALL_WRAP(name, listen, (struct socket *sock, int len), (sock, len)) \ 249 SOCKCALL_WRAP(name, shutdown, (struct socket *sock, int flags), (sock, flags)) \ 250 SOCKCALL_WRAP(name, setsockopt, (struct socket *sock, int level, int optname, \ 251 char __user *optval, int optlen), (sock, level, optname, optval, optlen)) \ 252 SOCKCALL_WRAP(name, getsockopt, (struct socket *sock, int level, int optname, \ 253 char __user *optval, int __user *optlen), (sock, level, optname, optval, optlen)) \ 254 SOCKCALL_WRAP(name, sendmsg, (struct kiocb *iocb, struct socket *sock, struct msghdr *m, size_t len), \ 255 (iocb, sock, m, len)) \ 256 SOCKCALL_WRAP(name, recvmsg, (struct kiocb *iocb, struct socket *sock, struct msghdr *m, size_t len, int flags), \ 257 (iocb, sock, m, len, flags)) \ 258 SOCKCALL_WRAP(name, mmap, (struct file *file, struct socket *sock, struct vm_area_struct *vma), \ 259 (file, sock, vma)) \ 260 \ 261 static struct proto_ops name##_ops = { \ 262 .family = fam, \ 263 .owner = THIS_MODULE, \ 264 .release = __lock_##name##_release, \ 265 .bind = __lock_##name##_bind, \ 266 .connect = __lock_##name##_connect, \ 267 .socketpair = __lock_##name##_socketpair, \ 268 .accept = __lock_##name##_accept, \ 269 .getname = __lock_##name##_getname, \ 270 .poll = __lock_##name##_poll, \ 271 .ioctl = __lock_##name##_ioctl, \ 272 .listen = __lock_##name##_listen, \ 273 .shutdown = __lock_##name##_shutdown, \ 274 .setsockopt = __lock_##name##_setsockopt, \ 275 .getsockopt = __lock_##name##_getsockopt, \ 276 .sendmsg = __lock_##name##_sendmsg, \ 277 .recvmsg = __lock_##name##_recvmsg, \ 278 .mmap = __lock_##name##_mmap, \ 279 }; 280 #endif 281 282 #define MODULE_ALIAS_NETPROTO(proto) \ 283 MODULE_ALIAS("net-pf-" __stringify(proto)) 284 285 #endif /* __KERNEL__ */ 286 #endif /* _LINUX_NET_H */ 287