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/socket.h> 22 #include <asm/socket.h> 23 24 #define NPROTO AF_MAX 25 26 #define SYS_SOCKET 1 /* sys_socket(2) */ 27 #define SYS_BIND 2 /* sys_bind(2) */ 28 #define SYS_CONNECT 3 /* sys_connect(2) */ 29 #define SYS_LISTEN 4 /* sys_listen(2) */ 30 #define SYS_ACCEPT 5 /* sys_accept(2) */ 31 #define SYS_GETSOCKNAME 6 /* sys_getsockname(2) */ 32 #define SYS_GETPEERNAME 7 /* sys_getpeername(2) */ 33 #define SYS_SOCKETPAIR 8 /* sys_socketpair(2) */ 34 #define SYS_SEND 9 /* sys_send(2) */ 35 #define SYS_RECV 10 /* sys_recv(2) */ 36 #define SYS_SENDTO 11 /* sys_sendto(2) */ 37 #define SYS_RECVFROM 12 /* sys_recvfrom(2) */ 38 #define SYS_SHUTDOWN 13 /* sys_shutdown(2) */ 39 #define SYS_SETSOCKOPT 14 /* sys_setsockopt(2) */ 40 #define SYS_GETSOCKOPT 15 /* sys_getsockopt(2) */ 41 #define SYS_SENDMSG 16 /* sys_sendmsg(2) */ 42 #define SYS_RECVMSG 17 /* sys_recvmsg(2) */ 43 #define SYS_ACCEPT4 18 /* sys_accept4(2) */ 44 #define SYS_RECVMMSG 19 /* sys_recvmmsg(2) */ 45 46 typedef enum { 47 SS_FREE = 0, /* not allocated */ 48 SS_UNCONNECTED, /* unconnected to any socket */ 49 SS_CONNECTING, /* in process of connecting */ 50 SS_CONNECTED, /* connected to socket */ 51 SS_DISCONNECTING /* in process of disconnecting */ 52 } socket_state; 53 54 #define __SO_ACCEPTCON (1 << 16) /* performed a listen */ 55 56 #ifdef __KERNEL__ 57 #include <linux/stringify.h> 58 #include <linux/random.h> 59 #include <linux/wait.h> 60 #include <linux/fcntl.h> /* For O_CLOEXEC and O_NONBLOCK */ 61 #include <linux/kmemcheck.h> 62 #include <linux/rcupdate.h> 63 64 struct poll_table_struct; 65 struct pipe_inode_info; 66 struct inode; 67 struct net; 68 69 #define SOCK_ASYNC_NOSPACE 0 70 #define SOCK_ASYNC_WAITDATA 1 71 #define SOCK_NOSPACE 2 72 #define SOCK_PASSCRED 3 73 #define SOCK_PASSSEC 4 74 75 #ifndef ARCH_HAS_SOCKET_TYPES 76 /** 77 * enum sock_type - Socket types 78 * @SOCK_STREAM: stream (connection) socket 79 * @SOCK_DGRAM: datagram (conn.less) socket 80 * @SOCK_RAW: raw socket 81 * @SOCK_RDM: reliably-delivered message 82 * @SOCK_SEQPACKET: sequential packet socket 83 * @SOCK_DCCP: Datagram Congestion Control Protocol socket 84 * @SOCK_PACKET: linux specific way of getting packets at the dev level. 85 * For writing rarp and other similar things on the user level. 86 * 87 * When adding some new socket type please 88 * grep ARCH_HAS_SOCKET_TYPE include/asm-* /socket.h, at least MIPS 89 * overrides this enum for binary compat reasons. 90 */ 91 enum sock_type { 92 SOCK_STREAM = 1, 93 SOCK_DGRAM = 2, 94 SOCK_RAW = 3, 95 SOCK_RDM = 4, 96 SOCK_SEQPACKET = 5, 97 SOCK_DCCP = 6, 98 SOCK_PACKET = 10, 99 }; 100 101 #define SOCK_MAX (SOCK_PACKET + 1) 102 /* Mask which covers at least up to SOCK_MASK-1. The 103 * remaining bits are used as flags. */ 104 #define SOCK_TYPE_MASK 0xf 105 106 /* Flags for socket, socketpair, accept4 */ 107 #define SOCK_CLOEXEC O_CLOEXEC 108 #ifndef SOCK_NONBLOCK 109 #define SOCK_NONBLOCK O_NONBLOCK 110 #endif 111 112 #endif /* ARCH_HAS_SOCKET_TYPES */ 113 114 enum sock_shutdown_cmd { 115 SHUT_RD = 0, 116 SHUT_WR = 1, 117 SHUT_RDWR = 2, 118 }; 119 120 struct socket_wq { 121 /* Note: wait MUST be first field of socket_wq */ 122 wait_queue_head_t wait; 123 struct fasync_struct *fasync_list; 124 struct rcu_head rcu; 125 } ____cacheline_aligned_in_smp; 126 127 /** 128 * struct socket - general BSD socket 129 * @state: socket state (%SS_CONNECTED, etc) 130 * @type: socket type (%SOCK_STREAM, etc) 131 * @flags: socket flags (%SOCK_ASYNC_NOSPACE, etc) 132 * @ops: protocol specific socket operations 133 * @file: File back pointer for gc 134 * @sk: internal networking protocol agnostic socket representation 135 * @wq: wait queue for several uses 136 */ 137 struct socket { 138 socket_state state; 139 140 kmemcheck_bitfield_begin(type); 141 short type; 142 kmemcheck_bitfield_end(type); 143 144 unsigned long flags; 145 146 struct socket_wq __rcu *wq; 147 148 struct file *file; 149 struct sock *sk; 150 const struct proto_ops *ops; 151 }; 152 153 struct vm_area_struct; 154 struct page; 155 struct kiocb; 156 struct sockaddr; 157 struct msghdr; 158 struct module; 159 160 struct proto_ops { 161 int family; 162 struct module *owner; 163 int (*release) (struct socket *sock); 164 int (*bind) (struct socket *sock, 165 struct sockaddr *myaddr, 166 int sockaddr_len); 167 int (*connect) (struct socket *sock, 168 struct sockaddr *vaddr, 169 int sockaddr_len, int flags); 170 int (*socketpair)(struct socket *sock1, 171 struct socket *sock2); 172 int (*accept) (struct socket *sock, 173 struct socket *newsock, int flags); 174 int (*getname) (struct socket *sock, 175 struct sockaddr *addr, 176 int *sockaddr_len, int peer); 177 unsigned int (*poll) (struct file *file, struct socket *sock, 178 struct poll_table_struct *wait); 179 int (*ioctl) (struct socket *sock, unsigned int cmd, 180 unsigned long arg); 181 #ifdef CONFIG_COMPAT 182 int (*compat_ioctl) (struct socket *sock, unsigned int cmd, 183 unsigned long arg); 184 #endif 185 int (*listen) (struct socket *sock, int len); 186 int (*shutdown) (struct socket *sock, int flags); 187 int (*setsockopt)(struct socket *sock, int level, 188 int optname, char __user *optval, unsigned int optlen); 189 int (*getsockopt)(struct socket *sock, int level, 190 int optname, char __user *optval, int __user *optlen); 191 #ifdef CONFIG_COMPAT 192 int (*compat_setsockopt)(struct socket *sock, int level, 193 int optname, char __user *optval, unsigned int optlen); 194 int (*compat_getsockopt)(struct socket *sock, int level, 195 int optname, char __user *optval, int __user *optlen); 196 #endif 197 int (*sendmsg) (struct kiocb *iocb, struct socket *sock, 198 struct msghdr *m, size_t total_len); 199 int (*recvmsg) (struct kiocb *iocb, struct socket *sock, 200 struct msghdr *m, size_t total_len, 201 int flags); 202 int (*mmap) (struct file *file, struct socket *sock, 203 struct vm_area_struct * vma); 204 ssize_t (*sendpage) (struct socket *sock, struct page *page, 205 int offset, size_t size, int flags); 206 ssize_t (*splice_read)(struct socket *sock, loff_t *ppos, 207 struct pipe_inode_info *pipe, size_t len, unsigned int flags); 208 }; 209 210 #define DECLARE_SOCKADDR(type, dst, src) \ 211 type dst = ({ __sockaddr_check_size(sizeof(*dst)); (type) src; }) 212 213 struct net_proto_family { 214 int family; 215 int (*create)(struct net *net, struct socket *sock, 216 int protocol, int kern); 217 struct module *owner; 218 }; 219 220 struct iovec; 221 struct kvec; 222 223 enum { 224 SOCK_WAKE_IO, 225 SOCK_WAKE_WAITD, 226 SOCK_WAKE_SPACE, 227 SOCK_WAKE_URG, 228 }; 229 230 extern int sock_wake_async(struct socket *sk, int how, int band); 231 extern int sock_register(const struct net_proto_family *fam); 232 extern void sock_unregister(int family); 233 extern int __sock_create(struct net *net, int family, int type, int proto, 234 struct socket **res, int kern); 235 extern int sock_create(int family, int type, int proto, 236 struct socket **res); 237 extern int sock_create_kern(int family, int type, int proto, 238 struct socket **res); 239 extern int sock_create_lite(int family, int type, int proto, 240 struct socket **res); 241 extern void sock_release(struct socket *sock); 242 extern int sock_sendmsg(struct socket *sock, struct msghdr *msg, 243 size_t len); 244 extern int sock_recvmsg(struct socket *sock, struct msghdr *msg, 245 size_t size, int flags); 246 extern int sock_map_fd(struct socket *sock, int flags); 247 extern struct socket *sockfd_lookup(int fd, int *err); 248 #define sockfd_put(sock) fput(sock->file) 249 extern int net_ratelimit(void); 250 251 #define net_random() random32() 252 #define net_srandom(seed) srandom32((__force u32)seed) 253 254 extern int kernel_sendmsg(struct socket *sock, struct msghdr *msg, 255 struct kvec *vec, size_t num, size_t len); 256 extern int kernel_recvmsg(struct socket *sock, struct msghdr *msg, 257 struct kvec *vec, size_t num, 258 size_t len, int flags); 259 260 extern int kernel_bind(struct socket *sock, struct sockaddr *addr, 261 int addrlen); 262 extern int kernel_listen(struct socket *sock, int backlog); 263 extern int kernel_accept(struct socket *sock, struct socket **newsock, 264 int flags); 265 extern int kernel_connect(struct socket *sock, struct sockaddr *addr, 266 int addrlen, int flags); 267 extern int kernel_getsockname(struct socket *sock, struct sockaddr *addr, 268 int *addrlen); 269 extern int kernel_getpeername(struct socket *sock, struct sockaddr *addr, 270 int *addrlen); 271 extern int kernel_getsockopt(struct socket *sock, int level, int optname, 272 char *optval, int *optlen); 273 extern int kernel_setsockopt(struct socket *sock, int level, int optname, 274 char *optval, unsigned int optlen); 275 extern int kernel_sendpage(struct socket *sock, struct page *page, int offset, 276 size_t size, int flags); 277 extern int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg); 278 extern int kernel_sock_shutdown(struct socket *sock, 279 enum sock_shutdown_cmd how); 280 281 #define MODULE_ALIAS_NETPROTO(proto) \ 282 MODULE_ALIAS("net-pf-" __stringify(proto)) 283 284 #define MODULE_ALIAS_NET_PF_PROTO(pf, proto) \ 285 MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto)) 286 287 #define MODULE_ALIAS_NET_PF_PROTO_TYPE(pf, proto, type) \ 288 MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto) \ 289 "-type-" __stringify(type)) 290 291 #ifdef CONFIG_SYSCTL 292 #include <linux/sysctl.h> 293 #include <linux/ratelimit.h> 294 extern struct ratelimit_state net_ratelimit_state; 295 #endif 296 297 #endif /* __KERNEL__ */ 298 #endif /* _LINUX_NET_H */ 299