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, <[email protected]> 10 * Ross Biro 11 * Fred N. van Kempen, <[email protected]> 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 file; 69 struct net; 70 71 #define SOCK_ASYNC_NOSPACE 0 72 #define SOCK_ASYNC_WAITDATA 1 73 #define SOCK_NOSPACE 2 74 #define SOCK_PASSCRED 3 75 #define SOCK_PASSSEC 4 76 #define SOCK_EXTERNALLY_ALLOCATED 5 77 78 #ifndef ARCH_HAS_SOCKET_TYPES 79 /** 80 * enum sock_type - Socket types 81 * @SOCK_STREAM: stream (connection) socket 82 * @SOCK_DGRAM: datagram (conn.less) socket 83 * @SOCK_RAW: raw socket 84 * @SOCK_RDM: reliably-delivered message 85 * @SOCK_SEQPACKET: sequential packet socket 86 * @SOCK_DCCP: Datagram Congestion Control Protocol socket 87 * @SOCK_PACKET: linux specific way of getting packets at the dev level. 88 * For writing rarp and other similar things on the user level. 89 * 90 * When adding some new socket type please 91 * grep ARCH_HAS_SOCKET_TYPE include/asm-* /socket.h, at least MIPS 92 * overrides this enum for binary compat reasons. 93 */ 94 enum sock_type { 95 SOCK_STREAM = 1, 96 SOCK_DGRAM = 2, 97 SOCK_RAW = 3, 98 SOCK_RDM = 4, 99 SOCK_SEQPACKET = 5, 100 SOCK_DCCP = 6, 101 SOCK_PACKET = 10, 102 }; 103 104 #define SOCK_MAX (SOCK_PACKET + 1) 105 /* Mask which covers at least up to SOCK_MASK-1. The 106 * remaining bits are used as flags. */ 107 #define SOCK_TYPE_MASK 0xf 108 109 /* Flags for socket, socketpair, accept4 */ 110 #define SOCK_CLOEXEC O_CLOEXEC 111 #ifndef SOCK_NONBLOCK 112 #define SOCK_NONBLOCK O_NONBLOCK 113 #endif 114 115 #endif /* ARCH_HAS_SOCKET_TYPES */ 116 117 enum sock_shutdown_cmd { 118 SHUT_RD = 0, 119 SHUT_WR = 1, 120 SHUT_RDWR = 2, 121 }; 122 123 struct socket_wq { 124 /* Note: wait MUST be first field of socket_wq */ 125 wait_queue_head_t wait; 126 struct fasync_struct *fasync_list; 127 struct rcu_head rcu; 128 } ____cacheline_aligned_in_smp; 129 130 /** 131 * struct socket - general BSD socket 132 * @state: socket state (%SS_CONNECTED, etc) 133 * @type: socket type (%SOCK_STREAM, etc) 134 * @flags: socket flags (%SOCK_ASYNC_NOSPACE, etc) 135 * @ops: protocol specific socket operations 136 * @file: File back pointer for gc 137 * @sk: internal networking protocol agnostic socket representation 138 * @wq: wait queue for several uses 139 */ 140 struct socket { 141 socket_state state; 142 143 kmemcheck_bitfield_begin(type); 144 short type; 145 kmemcheck_bitfield_end(type); 146 147 unsigned long flags; 148 149 struct socket_wq __rcu *wq; 150 151 struct file *file; 152 struct sock *sk; 153 const struct proto_ops *ops; 154 }; 155 156 struct vm_area_struct; 157 struct page; 158 struct kiocb; 159 struct sockaddr; 160 struct msghdr; 161 struct module; 162 163 struct proto_ops { 164 int family; 165 struct module *owner; 166 int (*release) (struct socket *sock); 167 int (*bind) (struct socket *sock, 168 struct sockaddr *myaddr, 169 int sockaddr_len); 170 int (*connect) (struct socket *sock, 171 struct sockaddr *vaddr, 172 int sockaddr_len, int flags); 173 int (*socketpair)(struct socket *sock1, 174 struct socket *sock2); 175 int (*accept) (struct socket *sock, 176 struct socket *newsock, int flags); 177 int (*getname) (struct socket *sock, 178 struct sockaddr *addr, 179 int *sockaddr_len, int peer); 180 unsigned int (*poll) (struct file *file, struct socket *sock, 181 struct poll_table_struct *wait); 182 int (*ioctl) (struct socket *sock, unsigned int cmd, 183 unsigned long arg); 184 #ifdef CONFIG_COMPAT 185 int (*compat_ioctl) (struct socket *sock, unsigned int cmd, 186 unsigned long arg); 187 #endif 188 int (*listen) (struct socket *sock, int len); 189 int (*shutdown) (struct socket *sock, int flags); 190 int (*setsockopt)(struct socket *sock, int level, 191 int optname, char __user *optval, unsigned int optlen); 192 int (*getsockopt)(struct socket *sock, int level, 193 int optname, char __user *optval, int __user *optlen); 194 #ifdef CONFIG_COMPAT 195 int (*compat_setsockopt)(struct socket *sock, int level, 196 int optname, char __user *optval, unsigned int optlen); 197 int (*compat_getsockopt)(struct socket *sock, int level, 198 int optname, char __user *optval, int __user *optlen); 199 #endif 200 int (*sendmsg) (struct kiocb *iocb, struct socket *sock, 201 struct msghdr *m, size_t total_len); 202 int (*recvmsg) (struct kiocb *iocb, struct socket *sock, 203 struct msghdr *m, size_t total_len, 204 int flags); 205 int (*mmap) (struct file *file, struct socket *sock, 206 struct vm_area_struct * vma); 207 ssize_t (*sendpage) (struct socket *sock, struct page *page, 208 int offset, size_t size, int flags); 209 ssize_t (*splice_read)(struct socket *sock, loff_t *ppos, 210 struct pipe_inode_info *pipe, size_t len, unsigned int flags); 211 void (*set_peek_off)(struct sock *sk, int val); 212 }; 213 214 #define DECLARE_SOCKADDR(type, dst, src) \ 215 type dst = ({ __sockaddr_check_size(sizeof(*dst)); (type) src; }) 216 217 struct net_proto_family { 218 int family; 219 int (*create)(struct net *net, struct socket *sock, 220 int protocol, int kern); 221 struct module *owner; 222 }; 223 224 struct iovec; 225 struct kvec; 226 227 enum { 228 SOCK_WAKE_IO, 229 SOCK_WAKE_WAITD, 230 SOCK_WAKE_SPACE, 231 SOCK_WAKE_URG, 232 }; 233 234 extern int sock_wake_async(struct socket *sk, int how, int band); 235 extern int sock_register(const struct net_proto_family *fam); 236 extern void sock_unregister(int family); 237 extern int __sock_create(struct net *net, int family, int type, int proto, 238 struct socket **res, int kern); 239 extern int sock_create(int family, int type, int proto, 240 struct socket **res); 241 extern int sock_create_kern(int family, int type, int proto, 242 struct socket **res); 243 extern int sock_create_lite(int family, int type, int proto, 244 struct socket **res); 245 extern void sock_release(struct socket *sock); 246 extern int sock_sendmsg(struct socket *sock, struct msghdr *msg, 247 size_t len); 248 extern int sock_recvmsg(struct socket *sock, struct msghdr *msg, 249 size_t size, int flags); 250 extern struct file *sock_alloc_file(struct socket *sock, int flags, const char *dname); 251 extern struct socket *sockfd_lookup(int fd, int *err); 252 extern struct socket *sock_from_file(struct file *file, int *err); 253 #define sockfd_put(sock) fput(sock->file) 254 extern int net_ratelimit(void); 255 256 #define net_ratelimited_function(function, ...) \ 257 do { \ 258 if (net_ratelimit()) \ 259 function(__VA_ARGS__); \ 260 } while (0) 261 262 #define net_emerg_ratelimited(fmt, ...) \ 263 net_ratelimited_function(pr_emerg, fmt, ##__VA_ARGS__) 264 #define net_alert_ratelimited(fmt, ...) \ 265 net_ratelimited_function(pr_alert, fmt, ##__VA_ARGS__) 266 #define net_crit_ratelimited(fmt, ...) \ 267 net_ratelimited_function(pr_crit, fmt, ##__VA_ARGS__) 268 #define net_err_ratelimited(fmt, ...) \ 269 net_ratelimited_function(pr_err, fmt, ##__VA_ARGS__) 270 #define net_notice_ratelimited(fmt, ...) \ 271 net_ratelimited_function(pr_notice, fmt, ##__VA_ARGS__) 272 #define net_warn_ratelimited(fmt, ...) \ 273 net_ratelimited_function(pr_warn, fmt, ##__VA_ARGS__) 274 #define net_info_ratelimited(fmt, ...) \ 275 net_ratelimited_function(pr_info, fmt, ##__VA_ARGS__) 276 #define net_dbg_ratelimited(fmt, ...) \ 277 net_ratelimited_function(pr_debug, fmt, ##__VA_ARGS__) 278 279 #define net_random() random32() 280 #define net_srandom(seed) srandom32((__force u32)seed) 281 282 extern int kernel_sendmsg(struct socket *sock, struct msghdr *msg, 283 struct kvec *vec, size_t num, size_t len); 284 extern int kernel_recvmsg(struct socket *sock, struct msghdr *msg, 285 struct kvec *vec, size_t num, 286 size_t len, int flags); 287 288 extern int kernel_bind(struct socket *sock, struct sockaddr *addr, 289 int addrlen); 290 extern int kernel_listen(struct socket *sock, int backlog); 291 extern int kernel_accept(struct socket *sock, struct socket **newsock, 292 int flags); 293 extern int kernel_connect(struct socket *sock, struct sockaddr *addr, 294 int addrlen, int flags); 295 extern int kernel_getsockname(struct socket *sock, struct sockaddr *addr, 296 int *addrlen); 297 extern int kernel_getpeername(struct socket *sock, struct sockaddr *addr, 298 int *addrlen); 299 extern int kernel_getsockopt(struct socket *sock, int level, int optname, 300 char *optval, int *optlen); 301 extern int kernel_setsockopt(struct socket *sock, int level, int optname, 302 char *optval, unsigned int optlen); 303 extern int kernel_sendpage(struct socket *sock, struct page *page, int offset, 304 size_t size, int flags); 305 extern int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg); 306 extern int kernel_sock_shutdown(struct socket *sock, 307 enum sock_shutdown_cmd how); 308 309 #define MODULE_ALIAS_NETPROTO(proto) \ 310 MODULE_ALIAS("net-pf-" __stringify(proto)) 311 312 #define MODULE_ALIAS_NET_PF_PROTO(pf, proto) \ 313 MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto)) 314 315 #define MODULE_ALIAS_NET_PF_PROTO_TYPE(pf, proto, type) \ 316 MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto) \ 317 "-type-" __stringify(type)) 318 319 #define MODULE_ALIAS_NET_PF_PROTO_NAME(pf, proto, name) \ 320 MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto) \ 321 name) 322 #endif /* __KERNEL__ */ 323 #endif /* _LINUX_NET_H */ 324