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 46typedef 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 64struct poll_table_struct; 65struct pipe_inode_info; 66struct inode; 67struct 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 */ 91enum 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 114enum sock_shutdown_cmd { 115 SHUT_RD = 0, 116 SHUT_WR = 1, 117 SHUT_RDWR = 2, 118}; 119 120struct socket_wq { 121 wait_queue_head_t wait; 122 struct fasync_struct *fasync_list; 123 struct rcu_head rcu; 124} ____cacheline_aligned_in_smp; 125 126/** 127 * struct socket - general BSD socket 128 * @state: socket state (%SS_CONNECTED, etc) 129 * @type: socket type (%SOCK_STREAM, etc) 130 * @flags: socket flags (%SOCK_ASYNC_NOSPACE, etc) 131 * @ops: protocol specific socket operations 132 * @file: File back pointer for gc 133 * @sk: internal networking protocol agnostic socket representation 134 * @wq: wait queue for several uses 135 */ 136struct socket { 137 socket_state state; 138 139 kmemcheck_bitfield_begin(type); 140 short type; 141 kmemcheck_bitfield_end(type); 142 143 unsigned long flags; 144 145 struct socket_wq *wq; 146 147 struct file *file; 148 struct sock *sk; 149 const struct proto_ops *ops; 150}; 151 152struct vm_area_struct; 153struct page; 154struct kiocb; 155struct sockaddr; 156struct msghdr; 157struct module; 158 159struct proto_ops { 160 int family; 161 struct module *owner; 162 int (*release) (struct socket *sock); 163 int (*bind) (struct socket *sock, 164 struct sockaddr *myaddr, 165 int sockaddr_len); 166 int (*connect) (struct socket *sock, 167 struct sockaddr *vaddr, 168 int sockaddr_len, int flags); 169 int (*socketpair)(struct socket *sock1, 170 struct socket *sock2); 171 int (*accept) (struct socket *sock, 172 struct socket *newsock, int flags); 173 int (*getname) (struct socket *sock, 174 struct sockaddr *addr, 175 int *sockaddr_len, int peer); 176 unsigned int (*poll) (struct file *file, struct socket *sock, 177 struct poll_table_struct *wait); 178 int (*ioctl) (struct socket *sock, unsigned int cmd, 179 unsigned long arg); 180#ifdef CONFIG_COMPAT 181 int (*compat_ioctl) (struct socket *sock, unsigned int cmd, 182 unsigned long arg); 183#endif 184 int (*listen) (struct socket *sock, int len); 185 int (*shutdown) (struct socket *sock, int flags); 186 int (*setsockopt)(struct socket *sock, int level, 187 int optname, char __user *optval, unsigned int optlen); 188 int (*getsockopt)(struct socket *sock, int level, 189 int optname, char __user *optval, int __user *optlen); 190#ifdef CONFIG_COMPAT 191 int (*compat_setsockopt)(struct socket *sock, int level, 192 int optname, char __user *optval, unsigned int optlen); 193 int (*compat_getsockopt)(struct socket *sock, int level, 194 int optname, char __user *optval, int __user *optlen); 195#endif 196 int (*sendmsg) (struct kiocb *iocb, struct socket *sock, 197 struct msghdr *m, size_t total_len); 198 int (*recvmsg) (struct kiocb *iocb, struct socket *sock, 199 struct msghdr *m, size_t total_len, 200 int flags); 201 int (*mmap) (struct file *file, struct socket *sock, 202 struct vm_area_struct * vma); 203 ssize_t (*sendpage) (struct socket *sock, struct page *page, 204 int offset, size_t size, int flags); 205 ssize_t (*splice_read)(struct socket *sock, loff_t *ppos, 206 struct pipe_inode_info *pipe, size_t len, unsigned int flags); 207}; 208 209#define DECLARE_SOCKADDR(type, dst, src) \ 210 type dst = ({ __sockaddr_check_size(sizeof(*dst)); (type) src; }) 211 212struct net_proto_family { 213 int family; 214 int (*create)(struct net *net, struct socket *sock, 215 int protocol, int kern); 216 struct module *owner; 217}; 218 219struct iovec; 220struct kvec; 221 222enum { 223 SOCK_WAKE_IO, 224 SOCK_WAKE_WAITD, 225 SOCK_WAKE_SPACE, 226 SOCK_WAKE_URG, 227}; 228 229extern int sock_wake_async(struct socket *sk, int how, int band); 230extern int sock_register(const struct net_proto_family *fam); 231extern void sock_unregister(int family); 232extern int sock_create(int family, int type, int proto, 233 struct socket **res); 234extern int sock_create_kern(int family, int type, int proto, 235 struct socket **res); 236extern int sock_create_lite(int family, int type, int proto, 237 struct socket **res); 238extern void sock_release(struct socket *sock); 239extern int sock_sendmsg(struct socket *sock, struct msghdr *msg, 240 size_t len); 241extern int sock_recvmsg(struct socket *sock, struct msghdr *msg, 242 size_t size, int flags); 243extern int sock_map_fd(struct socket *sock, int flags); 244extern struct socket *sockfd_lookup(int fd, int *err); 245#define sockfd_put(sock) fput(sock->file) 246extern int net_ratelimit(void); 247 248#define net_random() random32() 249#define net_srandom(seed) srandom32((__force u32)seed) 250 251extern int kernel_sendmsg(struct socket *sock, struct msghdr *msg, 252 struct kvec *vec, size_t num, size_t len); 253extern int kernel_recvmsg(struct socket *sock, struct msghdr *msg, 254 struct kvec *vec, size_t num, 255 size_t len, int flags); 256 257extern int kernel_bind(struct socket *sock, struct sockaddr *addr, 258 int addrlen); 259extern int kernel_listen(struct socket *sock, int backlog); 260extern int kernel_accept(struct socket *sock, struct socket **newsock, 261 int flags); 262extern int kernel_connect(struct socket *sock, struct sockaddr *addr, 263 int addrlen, int flags); 264extern int kernel_getsockname(struct socket *sock, struct sockaddr *addr, 265 int *addrlen); 266extern int kernel_getpeername(struct socket *sock, struct sockaddr *addr, 267 int *addrlen); 268extern int kernel_getsockopt(struct socket *sock, int level, int optname, 269 char *optval, int *optlen); 270extern int kernel_setsockopt(struct socket *sock, int level, int optname, 271 char *optval, unsigned int optlen); 272extern int kernel_sendpage(struct socket *sock, struct page *page, int offset, 273 size_t size, int flags); 274extern int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg); 275extern int kernel_sock_shutdown(struct socket *sock, 276 enum sock_shutdown_cmd how); 277 278#define MODULE_ALIAS_NETPROTO(proto) \ 279 MODULE_ALIAS("net-pf-" __stringify(proto)) 280 281#define MODULE_ALIAS_NET_PF_PROTO(pf, proto) \ 282 MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto)) 283 284#define MODULE_ALIAS_NET_PF_PROTO_TYPE(pf, proto, type) \ 285 MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto) \ 286 "-type-" __stringify(type)) 287 288#ifdef CONFIG_SYSCTL 289#include <linux/sysctl.h> 290#include <linux/ratelimit.h> 291extern struct ratelimit_state net_ratelimit_state; 292#endif 293 294#endif /* __KERNEL__ */ 295#endif /* _LINUX_NET_H */ 296