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