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/stringify.h>
  22#include <linux/random.h>
  23#include <linux/wait.h>
  24#include <linux/fcntl.h>        /* For O_CLOEXEC and O_NONBLOCK */
  25#include <linux/kmemcheck.h>
  26#include <linux/rcupdate.h>
  27#include <uapi/linux/net.h>
  28
  29struct poll_table_struct;
  30struct pipe_inode_info;
  31struct inode;
  32struct file;
  33struct net;
  34
  35#define SOCK_ASYNC_NOSPACE      0
  36#define SOCK_ASYNC_WAITDATA     1
  37#define SOCK_NOSPACE            2
  38#define SOCK_PASSCRED           3
  39#define SOCK_PASSSEC            4
  40#define SOCK_EXTERNALLY_ALLOCATED 5
  41
  42#ifndef ARCH_HAS_SOCKET_TYPES
  43/**
  44 * enum sock_type - Socket types
  45 * @SOCK_STREAM: stream (connection) socket
  46 * @SOCK_DGRAM: datagram (conn.less) socket
  47 * @SOCK_RAW: raw socket
  48 * @SOCK_RDM: reliably-delivered message
  49 * @SOCK_SEQPACKET: sequential packet socket
  50 * @SOCK_DCCP: Datagram Congestion Control Protocol socket
  51 * @SOCK_PACKET: linux specific way of getting packets at the dev level.
  52 *                For writing rarp and other similar things on the user level.
  53 *
  54 * When adding some new socket type please
  55 * grep ARCH_HAS_SOCKET_TYPE include/asm-* /socket.h, at least MIPS
  56 * overrides this enum for binary compat reasons.
  57 */
  58enum sock_type {
  59        SOCK_STREAM     = 1,
  60        SOCK_DGRAM      = 2,
  61        SOCK_RAW        = 3,
  62        SOCK_RDM        = 4,
  63        SOCK_SEQPACKET  = 5,
  64        SOCK_DCCP       = 6,
  65        SOCK_PACKET     = 10,
  66};
  67
  68#define SOCK_MAX (SOCK_PACKET + 1)
  69/* Mask which covers at least up to SOCK_MASK-1.  The
  70 * remaining bits are used as flags. */
  71#define SOCK_TYPE_MASK 0xf
  72
  73/* Flags for socket, socketpair, accept4 */
  74#define SOCK_CLOEXEC    O_CLOEXEC
  75#ifndef SOCK_NONBLOCK
  76#define SOCK_NONBLOCK   O_NONBLOCK
  77#endif
  78
  79#endif /* ARCH_HAS_SOCKET_TYPES */
  80
  81enum sock_shutdown_cmd {
  82        SHUT_RD         = 0,
  83        SHUT_WR         = 1,
  84        SHUT_RDWR       = 2,
  85};
  86
  87struct socket_wq {
  88        /* Note: wait MUST be first field of socket_wq */
  89        wait_queue_head_t       wait;
  90        struct fasync_struct    *fasync_list;
  91        struct rcu_head         rcu;
  92} ____cacheline_aligned_in_smp;
  93
  94/**
  95 *  struct socket - general BSD socket
  96 *  @state: socket state (%SS_CONNECTED, etc)
  97 *  @type: socket type (%SOCK_STREAM, etc)
  98 *  @flags: socket flags (%SOCK_ASYNC_NOSPACE, etc)
  99 *  @ops: protocol specific socket operations
 100 *  @file: File back pointer for gc
 101 *  @sk: internal networking protocol agnostic socket representation
 102 *  @wq: wait queue for several uses
 103 */
 104struct socket {
 105        socket_state            state;
 106
 107        kmemcheck_bitfield_begin(type);
 108        short                   type;
 109        kmemcheck_bitfield_end(type);
 110
 111        unsigned long           flags;
 112
 113        struct socket_wq __rcu  *wq;
 114
 115        struct file             *file;
 116        struct sock             *sk;
 117        const struct proto_ops  *ops;
 118};
 119
 120struct vm_area_struct;
 121struct page;
 122struct kiocb;
 123struct sockaddr;
 124struct msghdr;
 125struct module;
 126
 127struct proto_ops {
 128        int             family;
 129        struct module   *owner;
 130        int             (*release)   (struct socket *sock);
 131        int             (*bind)      (struct socket *sock,
 132                                      struct sockaddr *myaddr,
 133                                      int sockaddr_len);
 134        int             (*connect)   (struct socket *sock,
 135                                      struct sockaddr *vaddr,
 136                                      int sockaddr_len, int flags);
 137        int             (*socketpair)(struct socket *sock1,
 138                                      struct socket *sock2);
 139        int             (*accept)    (struct socket *sock,
 140                                      struct socket *newsock, int flags);
 141        int             (*getname)   (struct socket *sock,
 142                                      struct sockaddr *addr,
 143                                      int *sockaddr_len, int peer);
 144        unsigned int    (*poll)      (struct file *file, struct socket *sock,
 145                                      struct poll_table_struct *wait);
 146        int             (*ioctl)     (struct socket *sock, unsigned int cmd,
 147                                      unsigned long arg);
 148#ifdef CONFIG_COMPAT
 149        int             (*compat_ioctl) (struct socket *sock, unsigned int cmd,
 150                                      unsigned long arg);
 151#endif
 152        int             (*listen)    (struct socket *sock, int len);
 153        int             (*shutdown)  (struct socket *sock, int flags);
 154        int             (*setsockopt)(struct socket *sock, int level,
 155                                      int optname, char __user *optval, unsigned int optlen);
 156        int             (*getsockopt)(struct socket *sock, int level,
 157                                      int optname, char __user *optval, int __user *optlen);
 158#ifdef CONFIG_COMPAT
 159        int             (*compat_setsockopt)(struct socket *sock, int level,
 160                                      int optname, char __user *optval, unsigned int optlen);
 161        int             (*compat_getsockopt)(struct socket *sock, int level,
 162                                      int optname, char __user *optval, int __user *optlen);
 163#endif
 164        int             (*sendmsg)   (struct kiocb *iocb, struct socket *sock,
 165                                      struct msghdr *m, size_t total_len);
 166        int             (*recvmsg)   (struct kiocb *iocb, struct socket *sock,
 167                                      struct msghdr *m, size_t total_len,
 168                                      int flags);
 169        int             (*mmap)      (struct file *file, struct socket *sock,
 170                                      struct vm_area_struct * vma);
 171        ssize_t         (*sendpage)  (struct socket *sock, struct page *page,
 172                                      int offset, size_t size, int flags);
 173        ssize_t         (*splice_read)(struct socket *sock,  loff_t *ppos,
 174                                       struct pipe_inode_info *pipe, size_t len, unsigned int flags);
 175        void            (*set_peek_off)(struct sock *sk, int val);
 176};
 177
 178#define DECLARE_SOCKADDR(type, dst, src)        \
 179        type dst = ({ __sockaddr_check_size(sizeof(*dst)); (type) src; })
 180
 181struct net_proto_family {
 182        int             family;
 183        int             (*create)(struct net *net, struct socket *sock,
 184                                  int protocol, int kern);
 185        struct module   *owner;
 186};
 187
 188struct iovec;
 189struct kvec;
 190
 191enum {
 192        SOCK_WAKE_IO,
 193        SOCK_WAKE_WAITD,
 194        SOCK_WAKE_SPACE,
 195        SOCK_WAKE_URG,
 196};
 197
 198extern int           sock_wake_async(struct socket *sk, int how, int band);
 199extern int           sock_register(const struct net_proto_family *fam);
 200extern void          sock_unregister(int family);
 201extern int           __sock_create(struct net *net, int family, int type, int proto,
 202                                 struct socket **res, int kern);
 203extern int           sock_create(int family, int type, int proto,
 204                                 struct socket **res);
 205extern int           sock_create_kern(int family, int type, int proto,
 206                                      struct socket **res);
 207extern int           sock_create_lite(int family, int type, int proto,
 208                                      struct socket **res); 
 209extern void          sock_release(struct socket *sock);
 210extern int           sock_sendmsg(struct socket *sock, struct msghdr *msg,
 211                                  size_t len);
 212extern int           sock_recvmsg(struct socket *sock, struct msghdr *msg,
 213                                  size_t size, int flags);
 214extern struct file  *sock_alloc_file(struct socket *sock, int flags, const char *dname);
 215extern struct socket *sockfd_lookup(int fd, int *err);
 216extern struct socket *sock_from_file(struct file *file, int *err);
 217#define              sockfd_put(sock) fput(sock->file)
 218extern int           net_ratelimit(void);
 219
 220#define net_ratelimited_function(function, ...)                 \
 221do {                                                            \
 222        if (net_ratelimit())                                    \
 223                function(__VA_ARGS__);                          \
 224} while (0)
 225
 226#define net_emerg_ratelimited(fmt, ...)                         \
 227        net_ratelimited_function(pr_emerg, fmt, ##__VA_ARGS__)
 228#define net_alert_ratelimited(fmt, ...)                         \
 229        net_ratelimited_function(pr_alert, fmt, ##__VA_ARGS__)
 230#define net_crit_ratelimited(fmt, ...)                          \
 231        net_ratelimited_function(pr_crit, fmt, ##__VA_ARGS__)
 232#define net_err_ratelimited(fmt, ...)                           \
 233        net_ratelimited_function(pr_err, fmt, ##__VA_ARGS__)
 234#define net_notice_ratelimited(fmt, ...)                        \
 235        net_ratelimited_function(pr_notice, fmt, ##__VA_ARGS__)
 236#define net_warn_ratelimited(fmt, ...)                          \
 237        net_ratelimited_function(pr_warn, fmt, ##__VA_ARGS__)
 238#define net_info_ratelimited(fmt, ...)                          \
 239        net_ratelimited_function(pr_info, fmt, ##__VA_ARGS__)
 240#define net_dbg_ratelimited(fmt, ...)                           \
 241        net_ratelimited_function(pr_debug, fmt, ##__VA_ARGS__)
 242
 243#define net_random()            random32()
 244#define net_srandom(seed)       srandom32((__force u32)seed)
 245
 246extern int           kernel_sendmsg(struct socket *sock, struct msghdr *msg,
 247                                    struct kvec *vec, size_t num, size_t len);
 248extern int           kernel_recvmsg(struct socket *sock, struct msghdr *msg,
 249                                    struct kvec *vec, size_t num,
 250                                    size_t len, int flags);
 251
 252extern int kernel_bind(struct socket *sock, struct sockaddr *addr,
 253                       int addrlen);
 254extern int kernel_listen(struct socket *sock, int backlog);
 255extern int kernel_accept(struct socket *sock, struct socket **newsock,
 256                         int flags);
 257extern int kernel_connect(struct socket *sock, struct sockaddr *addr,
 258                          int addrlen, int flags);
 259extern int kernel_getsockname(struct socket *sock, struct sockaddr *addr,
 260                              int *addrlen);
 261extern int kernel_getpeername(struct socket *sock, struct sockaddr *addr,
 262                              int *addrlen);
 263extern int kernel_getsockopt(struct socket *sock, int level, int optname,
 264                             char *optval, int *optlen);
 265extern int kernel_setsockopt(struct socket *sock, int level, int optname,
 266                             char *optval, unsigned int optlen);
 267extern int kernel_sendpage(struct socket *sock, struct page *page, int offset,
 268                           size_t size, int flags);
 269extern int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg);
 270extern int kernel_sock_shutdown(struct socket *sock,
 271                                enum sock_shutdown_cmd how);
 272
 273#define MODULE_ALIAS_NETPROTO(proto) \
 274        MODULE_ALIAS("net-pf-" __stringify(proto))
 275
 276#define MODULE_ALIAS_NET_PF_PROTO(pf, proto) \
 277        MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto))
 278
 279#define MODULE_ALIAS_NET_PF_PROTO_TYPE(pf, proto, type) \
 280        MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto) \
 281                     "-type-" __stringify(type))
 282
 283#define MODULE_ALIAS_NET_PF_PROTO_NAME(pf, proto, name) \
 284        MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto) \
 285                     name)
 286#endif  /* _LINUX_NET_H */
 287
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