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 #define SYS_SENDMMSG 20 /* sys_sendmmsg(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 #include <linux/random.h> 60 #include <linux/wait.h> 61 #include <linux/fcntl.h> /* For O_CLOEXEC and O_NONBLOCK */ 62 #include <linux/kmemcheck.h> 63 #include <linux/rcupdate.h> 64 65 struct poll_table_struct; 66 struct pipe_inode_info; 67 struct inode; 68 struct net; 69 70 #define SOCK_ASYNC_NOSPACE 0 71 #define SOCK_ASYNC_WAITDATA 1 72 #define SOCK_NOSPACE 2 73 #define SOCK_PASSCRED 3 74 #define SOCK_PASSSEC 4 75 #define SOCK_EXTERNALLY_ALLOCATED 5 76 77 #ifndef ARCH_HAS_SOCKET_TYPES 78 /** 79 * enum sock_type - Socket types 80 * @SOCK_STREAM: stream (connection) socket 81 * @SOCK_DGRAM: datagram (conn.less) socket 82 * @SOCK_RAW: raw socket 83 * @SOCK_RDM: reliably-delivered message 84 * @SOCK_SEQPACKET: sequential packet socket 85 * @SOCK_DCCP: Datagram Congestion Control Protocol socket 86 * @SOCK_PACKET: linux specific way of getting packets at the dev level. 87 * For writing rarp and other similar things on the user level. 88 * 89 * When adding some new socket type please 90 * grep ARCH_HAS_SOCKET_TYPE include/asm-* /socket.h, at least MIPS 91 * overrides this enum for binary compat reasons. 92 */ 93 enum sock_type { 94 SOCK_STREAM = 1, 95 SOCK_DGRAM = 2, 96 SOCK_RAW = 3, 97 SOCK_RDM = 4, 98 SOCK_SEQPACKET = 5, 99 SOCK_DCCP = 6, 100 SOCK_PACKET = 10, 101 }; 102 103 #define SOCK_MAX (SOCK_PACKET + 1) 104 /* Mask which covers at least up to SOCK_MASK-1. The 105 * remaining bits are used as flags. */ 106 #define SOCK_TYPE_MASK 0xf 107 108 /* Flags for socket, socketpair, accept4 */ 109 #define SOCK_CLOEXEC O_CLOEXEC 110 #ifndef SOCK_NONBLOCK 111 #define SOCK_NONBLOCK O_NONBLOCK 112 #endif 113 114 #endif /* ARCH_HAS_SOCKET_TYPES */ 115 116 enum sock_shutdown_cmd { 117 SHUT_RD = 0, 118 SHUT_WR = 1, 119 SHUT_RDWR = 2, 120 }; 121 122 struct socket_wq { 123 /* Note: wait MUST be first field of socket_wq */ 124 wait_queue_head_t wait; 125 struct fasync_struct *fasync_list; 126 struct rcu_head rcu; 127 } ____cacheline_aligned_in_smp; 128 129 /** 130 * struct socket - general BSD socket 131 * @state: socket state (%SS_CONNECTED, etc) 132 * @type: socket type (%SOCK_STREAM, etc) 133 * @flags: socket flags (%SOCK_ASYNC_NOSPACE, etc) 134 * @ops: protocol specific socket operations 135 * @file: File back pointer for gc 136 * @sk: internal networking protocol agnostic socket representation 137 * @wq: wait queue for several uses 138 */ 139 struct socket { 140 socket_state state; 141 142 kmemcheck_bitfield_begin(type); 143 short type; 144 kmemcheck_bitfield_end(type); 145 146 unsigned long flags; 147 148 struct socket_wq __rcu *wq; 149 150 struct file *file; 151 struct sock *sk; 152 const struct proto_ops *ops; 153 }; 154 155 struct vm_area_struct; 156 struct page; 157 struct kiocb; 158 struct sockaddr; 159 struct msghdr; 160 struct module; 161 162 struct proto_ops { 163 int family; 164 struct module *owner; 165 int (*release) (struct socket *sock); 166 int (*bind) (struct socket *sock, 167 struct sockaddr *myaddr, 168 int sockaddr_len); 169 int (*connect) (struct socket *sock, 170 struct sockaddr *vaddr, 171 int sockaddr_len, int flags); 172 int (*socketpair)(struct socket *sock1, 173 struct socket *sock2); 174 int (*accept) (struct socket *sock, 175 struct socket *newsock, int flags); 176 int (*getname) (struct socket *sock, 177 struct sockaddr *addr, 178 int *sockaddr_len, int peer); 179 unsigned int (*poll) (struct file *file, struct socket *sock, 180 struct poll_table_struct *wait); 181 int (*ioctl) (struct socket *sock, unsigned int cmd, 182 unsigned long arg); 183 #ifdef CONFIG_COMPAT 184 int (*compat_ioctl) (struct socket *sock, unsigned int cmd, 185 unsigned long arg); 186 #endif 187 int (*listen) (struct socket *sock, int len); 188 int (*shutdown) (struct socket *sock, int flags); 189 int (*setsockopt)(struct socket *sock, int level, 190 int optname, char __user *optval, unsigned int optlen); 191 int (*getsockopt)(struct socket *sock, int level, 192 int optname, char __user *optval, int __user *optlen); 193 #ifdef CONFIG_COMPAT 194 int (*compat_setsockopt)(struct socket *sock, int level, 195 int optname, char __user *optval, unsigned int optlen); 196 int (*compat_getsockopt)(struct socket *sock, int level, 197 int optname, char __user *optval, int __user *optlen); 198 #endif 199 int (*sendmsg) (struct kiocb *iocb, struct socket *sock, 200 struct msghdr *m, size_t total_len); 201 int (*recvmsg) (struct kiocb *iocb, struct socket *sock, 202 struct msghdr *m, size_t total_len, 203 int flags); 204 int (*mmap) (struct file *file, struct socket *sock, 205 struct vm_area_struct * vma); 206 ssize_t (*sendpage) (struct socket *sock, struct page *page, 207 int offset, size_t size, int flags); 208 ssize_t (*splice_read)(struct socket *sock, loff_t *ppos, 209 struct pipe_inode_info *pipe, size_t len, unsigned int flags); 210 void (*set_peek_off)(struct sock *sk, int val); 211 }; 212 213 #define DECLARE_SOCKADDR(type, dst, src) \ 214 type dst = ({ __sockaddr_check_size(sizeof(*dst)); (type) src; }) 215 216 struct net_proto_family { 217 int family; 218 int (*create)(struct net *net, struct socket *sock, 219 int protocol, int kern); 220 struct module *owner; 221 }; 222 223 struct iovec; 224 struct kvec; 225 226 enum { 227 SOCK_WAKE_IO, 228 SOCK_WAKE_WAITD, 229 SOCK_WAKE_SPACE, 230 SOCK_WAKE_URG, 231 }; 232 233 extern int sock_wake_async(struct socket *sk, int how, int band); 234 extern int sock_register(const struct net_proto_family *fam); 235 extern void sock_unregister(int family); 236 extern int __sock_create(struct net *net, int family, int type, int proto, 237 struct socket **res, int kern); 238 extern int sock_create(int family, int type, int proto, 239 struct socket **res); 240 extern int sock_create_kern(int family, int type, int proto, 241 struct socket **res); 242 extern int sock_create_lite(int family, int type, int proto, 243 struct socket **res); 244 extern void sock_release(struct socket *sock); 245 extern int sock_sendmsg(struct socket *sock, struct msghdr *msg, 246 size_t len); 247 extern int sock_recvmsg(struct socket *sock, struct msghdr *msg, 248 size_t size, int flags); 249 extern int sock_map_fd(struct socket *sock, int flags); 250 extern struct socket *sockfd_lookup(int fd, int *err); 251 #define sockfd_put(sock) fput(sock->file) 252 extern int net_ratelimit(void); 253 254 #define net_random() random32() 255 #define net_srandom(seed) srandom32((__force u32)seed) 256 257 extern int kernel_sendmsg(struct socket *sock, struct msghdr *msg, 258 struct kvec *vec, size_t num, size_t len); 259 extern int kernel_recvmsg(struct socket *sock, struct msghdr *msg, 260 struct kvec *vec, size_t num, 261 size_t len, int flags); 262 263 extern int kernel_bind(struct socket *sock, struct sockaddr *addr, 264 int addrlen); 265 extern int kernel_listen(struct socket *sock, int backlog); 266 extern int kernel_accept(struct socket *sock, struct socket **newsock, 267 int flags); 268 extern int kernel_connect(struct socket *sock, struct sockaddr *addr, 269 int addrlen, int flags); 270 extern int kernel_getsockname(struct socket *sock, struct sockaddr *addr, 271 int *addrlen); 272 extern int kernel_getpeername(struct socket *sock, struct sockaddr *addr, 273 int *addrlen); 274 extern int kernel_getsockopt(struct socket *sock, int level, int optname, 275 char *optval, int *optlen); 276 extern int kernel_setsockopt(struct socket *sock, int level, int optname, 277 char *optval, unsigned int optlen); 278 extern int kernel_sendpage(struct socket *sock, struct page *page, int offset, 279 size_t size, int flags); 280 extern int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg); 281 extern int kernel_sock_shutdown(struct socket *sock, 282 enum sock_shutdown_cmd how); 283 284 #define MODULE_ALIAS_NETPROTO(proto) \ 285 MODULE_ALIAS("net-pf-" __stringify(proto)) 286 287 #define MODULE_ALIAS_NET_PF_PROTO(pf, proto) \ 288 MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto)) 289 290 #define MODULE_ALIAS_NET_PF_PROTO_TYPE(pf, proto, type) \ 291 MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto) \ 292 "-type-" __stringify(type)) 293 294 #endif /* __KERNEL__ */ 295 #endif /* _LINUX_NET_H */ 296