linux/include/linux/net.h
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   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
  47typedef 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
  65struct poll_table_struct;
  66struct pipe_inode_info;
  67struct inode;
  68struct 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 */
  93enum 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
 116enum sock_shutdown_cmd {
 117        SHUT_RD         = 0,
 118        SHUT_WR         = 1,
 119        SHUT_RDWR       = 2,
 120};
 121
 122struct 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 */
 139struct 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
 155struct vm_area_struct;
 156struct page;
 157struct kiocb;
 158struct sockaddr;
 159struct msghdr;
 160struct module;
 161
 162struct 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
 216struct 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
 223struct iovec;
 224struct kvec;
 225
 226enum {
 227        SOCK_WAKE_IO,
 228        SOCK_WAKE_WAITD,
 229        SOCK_WAKE_SPACE,
 230        SOCK_WAKE_URG,
 231};
 232
 233extern int           sock_wake_async(struct socket *sk, int how, int band);
 234extern int           sock_register(const struct net_proto_family *fam);
 235extern void          sock_unregister(int family);
 236extern int           __sock_create(struct net *net, int family, int type, int proto,
 237                                 struct socket **res, int kern);
 238extern int           sock_create(int family, int type, int proto,
 239                                 struct socket **res);
 240extern int           sock_create_kern(int family, int type, int proto,
 241                                      struct socket **res);
 242extern int           sock_create_lite(int family, int type, int proto,
 243                                      struct socket **res); 
 244extern void          sock_release(struct socket *sock);
 245extern int           sock_sendmsg(struct socket *sock, struct msghdr *msg,
 246                                  size_t len);
 247extern int           sock_recvmsg(struct socket *sock, struct msghdr *msg,
 248                                  size_t size, int flags);
 249extern int           sock_map_fd(struct socket *sock, int flags);
 250extern struct socket *sockfd_lookup(int fd, int *err);
 251extern struct socket *sock_from_file(struct file *file, int *err);
 252#define              sockfd_put(sock) fput(sock->file)
 253extern int           net_ratelimit(void);
 254
 255#define net_ratelimited_function(function, ...)                 \
 256do {                                                            \
 257        if (net_ratelimit())                                    \
 258                function(__VA_ARGS__);                          \
 259} while (0)
 260
 261#define net_emerg_ratelimited(fmt, ...)                         \
 262        net_ratelimited_function(pr_emerg, fmt, ##__VA_ARGS__)
 263#define net_alert_ratelimited(fmt, ...)                         \
 264        net_ratelimited_function(pr_alert, fmt, ##__VA_ARGS__)
 265#define net_crit_ratelimited(fmt, ...)                          \
 266        net_ratelimited_function(pr_crit, fmt, ##__VA_ARGS__)
 267#define net_err_ratelimited(fmt, ...)                           \
 268        net_ratelimited_function(pr_err, fmt, ##__VA_ARGS__)
 269#define net_notice_ratelimited(fmt, ...)                        \
 270        net_ratelimited_function(pr_notice, fmt, ##__VA_ARGS__)
 271#define net_warn_ratelimited(fmt, ...)                          \
 272        net_ratelimited_function(pr_warn, fmt, ##__VA_ARGS__)
 273#define net_info_ratelimited(fmt, ...)                          \
 274        net_ratelimited_function(pr_info, fmt, ##__VA_ARGS__)
 275#define net_dbg_ratelimited(fmt, ...)                           \
 276        net_ratelimited_function(pr_debug, fmt, ##__VA_ARGS__)
 277
 278#define net_random()            random32()
 279#define net_srandom(seed)       srandom32((__force u32)seed)
 280
 281extern int           kernel_sendmsg(struct socket *sock, struct msghdr *msg,
 282                                    struct kvec *vec, size_t num, size_t len);
 283extern int           kernel_recvmsg(struct socket *sock, struct msghdr *msg,
 284                                    struct kvec *vec, size_t num,
 285                                    size_t len, int flags);
 286
 287extern int kernel_bind(struct socket *sock, struct sockaddr *addr,
 288                       int addrlen);
 289extern int kernel_listen(struct socket *sock, int backlog);
 290extern int kernel_accept(struct socket *sock, struct socket **newsock,
 291                         int flags);
 292extern int kernel_connect(struct socket *sock, struct sockaddr *addr,
 293                          int addrlen, int flags);
 294extern int kernel_getsockname(struct socket *sock, struct sockaddr *addr,
 295                              int *addrlen);
 296extern int kernel_getpeername(struct socket *sock, struct sockaddr *addr,
 297                              int *addrlen);
 298extern int kernel_getsockopt(struct socket *sock, int level, int optname,
 299                             char *optval, int *optlen);
 300extern int kernel_setsockopt(struct socket *sock, int level, int optname,
 301                             char *optval, unsigned int optlen);
 302extern int kernel_sendpage(struct socket *sock, struct page *page, int offset,
 303                           size_t size, int flags);
 304extern int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg);
 305extern int kernel_sock_shutdown(struct socket *sock,
 306                                enum sock_shutdown_cmd how);
 307
 308#define MODULE_ALIAS_NETPROTO(proto) \
 309        MODULE_ALIAS("net-pf-" __stringify(proto))
 310
 311#define MODULE_ALIAS_NET_PF_PROTO(pf, proto) \
 312        MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto))
 313
 314#define MODULE_ALIAS_NET_PF_PROTO_TYPE(pf, proto, type) \
 315        MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto) \
 316                     "-type-" __stringify(type))
 317
 318#define MODULE_ALIAS_NET_PF_PROTO_NAME(pf, proto, name) \
 319        MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto) \
 320                     name)
 321#endif /* __KERNEL__ */
 322#endif  /* _LINUX_NET_H */
 323
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