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/wait.h> 22 #include <asm/socket.h> 23 24 struct poll_table_struct; 25 struct inode; 26 27 #define NPROTO 32 /* should be enough for now.. */ 28 29 #define SYS_SOCKET 1 /* sys_socket(2) */ 30 #define SYS_BIND 2 /* sys_bind(2) */ 31 #define SYS_CONNECT 3 /* sys_connect(2) */ 32 #define SYS_LISTEN 4 /* sys_listen(2) */ 33 #define SYS_ACCEPT 5 /* sys_accept(2) */ 34 #define SYS_GETSOCKNAME 6 /* sys_getsockname(2) */ 35 #define SYS_GETPEERNAME 7 /* sys_getpeername(2) */ 36 #define SYS_SOCKETPAIR 8 /* sys_socketpair(2) */ 37 #define SYS_SEND 9 /* sys_send(2) */ 38 #define SYS_RECV 10 /* sys_recv(2) */ 39 #define SYS_SENDTO 11 /* sys_sendto(2) */ 40 #define SYS_RECVFROM 12 /* sys_recvfrom(2) */ 41 #define SYS_SHUTDOWN 13 /* sys_shutdown(2) */ 42 #define SYS_SETSOCKOPT 14 /* sys_setsockopt(2) */ 43 #define SYS_GETSOCKOPT 15 /* sys_getsockopt(2) */ 44 #define SYS_SENDMSG 16 /* sys_sendmsg(2) */ 45 #define SYS_RECVMSG 17 /* sys_recvmsg(2) */ 46 47 typedef enum { 48 SS_FREE = 0, /* not allocated */ 49 SS_UNCONNECTED, /* unconnected to any socket */ 50 SS_CONNECTING, /* in process of connecting */ 51 SS_CONNECTED, /* connected to socket */ 52 SS_DISCONNECTING /* in process of disconnecting */ 53 } socket_state; 54 55 #define __SO_ACCEPTCON (1 << 16) /* performed a listen */ 56 57 #ifdef __KERNEL__ 58 #include <linux/stringify.h> 59 60 #define SOCK_ASYNC_NOSPACE 0 61 #define SOCK_ASYNC_WAITDATA 1 62 #define SOCK_NOSPACE 2 63 #define SOCK_PASSCRED 3 64 #define SOCK_PASSSEC 4 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_DCCP: Datagram Congestion Control Protocol socket 75 * @SOCK_PACKET: linux specific way of getting packets at the dev level. 76 * For writing rarp and other similar things on the user level. 77 * 78 * When adding some new socket type please 79 * grep ARCH_HAS_SOCKET_TYPE include/asm-* /socket.h, at least MIPS 80 * overrides this enum for binary compat reasons. 81 */ 82 enum sock_type { 83 SOCK_STREAM = 1, 84 SOCK_DGRAM = 2, 85 SOCK_RAW = 3, 86 SOCK_RDM = 4, 87 SOCK_SEQPACKET = 5, 88 SOCK_DCCP = 6, 89 SOCK_PACKET = 10, 90 }; 91 92 #define SOCK_MAX (SOCK_PACKET + 1) 93 94 #endif /* ARCH_HAS_SOCKET_TYPES */ 95 96 /** 97 * struct socket - general BSD socket 98 * @state: socket state (%SS_CONNECTED, etc) 99 * @flags: socket flags (%SOCK_ASYNC_NOSPACE, etc) 100 * @ops: protocol specific socket operations 101 * @fasync_list: Asynchronous wake up list 102 * @file: File back pointer for gc 103 * @sk: internal networking protocol agnostic socket representation 104 * @wait: wait queue for several uses 105 * @type: socket type (%SOCK_STREAM, etc) 106 */ 107 struct socket { 108 socket_state state; 109 unsigned long flags; 110 const struct proto_ops *ops; 111 struct fasync_struct *fasync_list; 112 struct file *file; 113 struct sock *sk; 114 wait_queue_head_t wait; 115 short type; 116 }; 117 118 struct vm_area_struct; 119 struct page; 120 struct kiocb; 121 struct sockaddr; 122 struct msghdr; 123 struct module; 124 125 struct proto_ops { 126 int family; 127 struct module *owner; 128 int (*release) (struct socket *sock); 129 int (*bind) (struct socket *sock, 130 struct sockaddr *myaddr, 131 int sockaddr_len); 132 int (*connect) (struct socket *sock, 133 struct sockaddr *vaddr, 134 int sockaddr_len, int flags); 135 int (*socketpair)(struct socket *sock1, 136 struct socket *sock2); 137 int (*accept) (struct socket *sock, 138 struct socket *newsock, int flags); 139 int (*getname) (struct socket *sock, 140 struct sockaddr *addr, 141 int *sockaddr_len, int peer); 142 unsigned int (*poll) (struct file *file, struct socket *sock, 143 struct poll_table_struct *wait); 144 int (*ioctl) (struct socket *sock, unsigned int cmd, 145 unsigned long arg); 146 int (*compat_ioctl) (struct socket *sock, unsigned int cmd, 147 unsigned long arg); 148 int (*listen) (struct socket *sock, int len); 149 int (*shutdown) (struct socket *sock, int flags); 150 int (*setsockopt)(struct socket *sock, int level, 151 int optname, char __user *optval, int optlen); 152 int (*getsockopt)(struct socket *sock, int level, 153 int optname, char __user *optval, int __user *optlen); 154 int (*compat_setsockopt)(struct socket *sock, int level, 155 int optname, char __user *optval, int optlen); 156 int (*compat_getsockopt)(struct socket *sock, int level, 157 int optname, char __user *optval, int __user *optlen); 158 int (*sendmsg) (struct kiocb *iocb, struct socket *sock, 159 struct msghdr *m, size_t total_len); 160 int (*recvmsg) (struct kiocb *iocb, struct socket *sock, 161 struct msghdr *m, size_t total_len, 162 int flags); 163 int (*mmap) (struct file *file, struct socket *sock, 164 struct vm_area_struct * vma); 165 ssize_t (*sendpage) (struct socket *sock, struct page *page, 166 int offset, size_t size, int flags); 167 }; 168 169 struct net_proto_family { 170 int family; 171 int (*create)(struct socket *sock, int protocol); 172 /* These are counters for the number of different methods of 173 each we support */ 174 short authentication; 175 short encryption; 176 short encrypt_net; 177 struct module *owner; 178 }; 179 180 struct iovec; 181 struct kvec; 182 183 extern int sock_wake_async(struct socket *sk, int how, int band); 184 extern int sock_register(struct net_proto_family *fam); 185 extern int sock_unregister(int family); 186 extern int sock_create(int family, int type, int proto, 187 struct socket **res); 188 extern int sock_create_kern(int family, int type, int proto, 189 struct socket **res); 190 extern int sock_create_lite(int family, int type, int proto, 191 struct socket **res); 192 extern void sock_release(struct socket *sock); 193 extern int sock_sendmsg(struct socket *sock, struct msghdr *msg, 194 size_t len); 195 extern int sock_recvmsg(struct socket *sock, struct msghdr *msg, 196 size_t size, int flags); 197 extern int sock_map_fd(struct socket *sock); 198 extern struct socket *sockfd_lookup(int fd, int *err); 199 #define sockfd_put(sock) fput(sock->file) 200 extern int net_ratelimit(void); 201 extern unsigned long net_random(void); 202 extern void net_srandom(unsigned long); 203 extern void net_random_init(void); 204 205 extern int kernel_sendmsg(struct socket *sock, struct msghdr *msg, 206 struct kvec *vec, size_t num, size_t len); 207 extern int kernel_recvmsg(struct socket *sock, struct msghdr *msg, 208 struct kvec *vec, size_t num, 209 size_t len, int flags); 210 211 #ifndef CONFIG_SMP 212 #define SOCKOPS_WRAPPED(name) name 213 #define SOCKOPS_WRAP(name, fam) 214 #else 215 216 #define SOCKOPS_WRAPPED(name) __unlocked_##name 217 218 #define SOCKCALL_WRAP(name, call, parms, args) \ 219 static int __lock_##name##_##call parms \ 220 { \ 221 int ret; \ 222 lock_kernel(); \ 223 ret = __unlocked_##name##_ops.call args ;\ 224 unlock_kernel(); \ 225 return ret; \ 226 } 227 228 #define SOCKCALL_UWRAP(name, call, parms, args) \ 229 static unsigned int __lock_##name##_##call parms \ 230 { \ 231 int ret; \ 232 lock_kernel(); \ 233 ret = __unlocked_##name##_ops.call args ;\ 234 unlock_kernel(); \ 235 return ret; \ 236 } 237 238 239 #define SOCKOPS_WRAP(name, fam) \ 240 SOCKCALL_WRAP(name, release, (struct socket *sock), (sock)) \ 241 SOCKCALL_WRAP(name, bind, (struct socket *sock, struct sockaddr *uaddr, int addr_len), \ 242 (sock, uaddr, addr_len)) \ 243 SOCKCALL_WRAP(name, connect, (struct socket *sock, struct sockaddr * uaddr, \ 244 int addr_len, int flags), \ 245 (sock, uaddr, addr_len, flags)) \ 246 SOCKCALL_WRAP(name, socketpair, (struct socket *sock1, struct socket *sock2), \ 247 (sock1, sock2)) \ 248 SOCKCALL_WRAP(name, accept, (struct socket *sock, struct socket *newsock, \ 249 int flags), (sock, newsock, flags)) \ 250 SOCKCALL_WRAP(name, getname, (struct socket *sock, struct sockaddr *uaddr, \ 251 int *addr_len, int peer), (sock, uaddr, addr_len, peer)) \ 252 SOCKCALL_UWRAP(name, poll, (struct file *file, struct socket *sock, struct poll_table_struct *wait), \ 253 (file, sock, wait)) \ 254 SOCKCALL_WRAP(name, ioctl, (struct socket *sock, unsigned int cmd, \ 255 unsigned long arg), (sock, cmd, arg)) \ 256 SOCKCALL_WRAP(name, compat_ioctl, (struct socket *sock, unsigned int cmd, \ 257 unsigned long arg), (sock, cmd, arg)) \ 258 SOCKCALL_WRAP(name, listen, (struct socket *sock, int len), (sock, len)) \ 259 SOCKCALL_WRAP(name, shutdown, (struct socket *sock, int flags), (sock, flags)) \ 260 SOCKCALL_WRAP(name, setsockopt, (struct socket *sock, int level, int optname, \ 261 char __user *optval, int optlen), (sock, level, optname, optval, optlen)) \ 262 SOCKCALL_WRAP(name, getsockopt, (struct socket *sock, int level, int optname, \ 263 char __user *optval, int __user *optlen), (sock, level, optname, optval, optlen)) \ 264 SOCKCALL_WRAP(name, sendmsg, (struct kiocb *iocb, struct socket *sock, struct msghdr *m, size_t len), \ 265 (iocb, sock, m, len)) \ 266 SOCKCALL_WRAP(name, recvmsg, (struct kiocb *iocb, struct socket *sock, struct msghdr *m, size_t len, int flags), \ 267 (iocb, sock, m, len, flags)) \ 268 SOCKCALL_WRAP(name, mmap, (struct file *file, struct socket *sock, struct vm_area_struct *vma), \ 269 (file, sock, vma)) \ 270 \ 271 static const struct proto_ops name##_ops = { \ 272 .family = fam, \ 273 .owner = THIS_MODULE, \ 274 .release = __lock_##name##_release, \ 275 .bind = __lock_##name##_bind, \ 276 .connect = __lock_##name##_connect, \ 277 .socketpair = __lock_##name##_socketpair, \ 278 .accept = __lock_##name##_accept, \ 279 .getname = __lock_##name##_getname, \ 280 .poll = __lock_##name##_poll, \ 281 .ioctl = __lock_##name##_ioctl, \ 282 .compat_ioctl = __lock_##name##_compat_ioctl, \ 283 .listen = __lock_##name##_listen, \ 284 .shutdown = __lock_##name##_shutdown, \ 285 .setsockopt = __lock_##name##_setsockopt, \ 286 .getsockopt = __lock_##name##_getsockopt, \ 287 .sendmsg = __lock_##name##_sendmsg, \ 288 .recvmsg = __lock_##name##_recvmsg, \ 289 .mmap = __lock_##name##_mmap, \ 290 }; 291 292 #endif 293 294 #define MODULE_ALIAS_NETPROTO(proto) \ 295 MODULE_ALIAS("net-pf-" __stringify(proto)) 296 297 #define MODULE_ALIAS_NET_PF_PROTO(pf, proto) \ 298 MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto)) 299 300 #ifdef CONFIG_SYSCTL 301 #include <linux/sysctl.h> 302 extern ctl_table net_table[]; 303 extern int net_msg_cost; 304 extern int net_msg_burst; 305 #endif 306 307 #endif /* __KERNEL__ */ 308 #endif /* _LINUX_NET_H */ 309