LXR linux-bk/include/linux/net.h

   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, <bir7@leland.Stanford.Edu>
  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/config.h>
  22#include <linux/wait.h>
  23#include <linux/stringify.h>
  24
  25struct poll_table_struct;
  26struct inode;
  27
  28#define NPROTO          32              /* should be enough for now..   */
  29
  30#define SYS_SOCKET      1               /* sys_socket(2)                */
  31#define SYS_BIND        2               /* sys_bind(2)                  */
  32#define SYS_CONNECT     3               /* sys_connect(2)               */
  33#define SYS_LISTEN      4               /* sys_listen(2)                */
  34#define SYS_ACCEPT      5               /* sys_accept(2)                */
  35#define SYS_GETSOCKNAME 6               /* sys_getsockname(2)           */
  36#define SYS_GETPEERNAME 7               /* sys_getpeername(2)           */
  37#define SYS_SOCKETPAIR  8               /* sys_socketpair(2)            */
  38#define SYS_SEND        9               /* sys_send(2)                  */
  39#define SYS_RECV        10              /* sys_recv(2)                  */
  40#define SYS_SENDTO      11              /* sys_sendto(2)                */
  41#define SYS_RECVFROM    12              /* sys_recvfrom(2)              */
  42#define SYS_SHUTDOWN    13              /* sys_shutdown(2)              */
  43#define SYS_SETSOCKOPT  14              /* sys_setsockopt(2)            */
  44#define SYS_GETSOCKOPT  15              /* sys_getsockopt(2)            */
  45#define SYS_SENDMSG     16              /* sys_sendmsg(2)               */
  46#define SYS_RECVMSG     17              /* sys_recvmsg(2)               */
  47
  48typedef enum {
  49        SS_FREE = 0,                    /* not allocated                */
  50        SS_UNCONNECTED,                 /* unconnected to any socket    */
  51        SS_CONNECTING,                  /* in process of connecting     */
  52        SS_CONNECTED,                   /* connected to socket          */
  53        SS_DISCONNECTING                /* in process of disconnecting  */
  54} socket_state;
  55
  56#define __SO_ACCEPTCON  (1 << 16)       /* performed a listen           */
  57
  58#ifdef __KERNEL__
  59
  60#define SOCK_ASYNC_NOSPACE      0
  61#define SOCK_ASYNC_WAITDATA     1
  62#define SOCK_NOSPACE            2
  63
  64/**
  65 *  struct socket - general BSD socket
  66 *  @state - socket state (%SS_CONNECTED, etc)
  67 *  @flags - socket flags (%SOCK_ASYNC_NOSPACE, etc)
  68 *  @ops - protocol specific socket operations
  69 *  @fasync_list - Asynchronous wake up list
  70 *  @file - File back pointer for gc
  71 *  @sk - internal networking protocol agnostic socket representation
  72 *  @wait - wait queue for several uses
  73 *  @type - socket type (%SOCK_STREAM, etc)
  74 *  @passcred - credentials (used only in Unix Sockets (aka PF_LOCAL))
  75 */
  76struct socket {
  77        socket_state            state;
  78        unsigned long           flags;
  79        struct proto_ops        *ops;
  80        struct fasync_struct    *fasync_list;
  81        struct file             *file;
  82        struct sock             *sk;
  83        wait_queue_head_t       wait;
  84        short                   type;
  85        unsigned char           passcred;
  86};
  87
  88struct vm_area_struct;
  89struct page;
  90struct kiocb;
  91struct sockaddr;
  92struct msghdr;
  93struct module;
  94
  95struct proto_ops {
  96        int             family;
  97        struct module   *owner;
  98        int             (*release)   (struct socket *sock);
  99        int             (*bind)      (struct socket *sock,
 100                                      struct sockaddr *myaddr,
 101                                      int sockaddr_len);
 102        int             (*connect)   (struct socket *sock,
 103                                      struct sockaddr *vaddr,
 104                                      int sockaddr_len, int flags);
 105        int             (*socketpair)(struct socket *sock1,
 106                                      struct socket *sock2);
 107        int             (*accept)    (struct socket *sock,
 108                                      struct socket *newsock, int flags);
 109        int             (*getname)   (struct socket *sock,
 110                                      struct sockaddr *addr,
 111                                      int *sockaddr_len, int peer);
 112        unsigned int    (*poll)      (struct file *file, struct socket *sock,
 113                                      struct poll_table_struct *wait);
 114        int             (*ioctl)     (struct socket *sock, unsigned int cmd,
 115                                      unsigned long arg);
 116        int             (*listen)    (struct socket *sock, int len);
 117        int             (*shutdown)  (struct socket *sock, int flags);
 118        int             (*setsockopt)(struct socket *sock, int level,
 119                                      int optname, char __user *optval, int optlen);
 120        int             (*getsockopt)(struct socket *sock, int level,
 121                                      int optname, char __user *optval, int __user *optlen);
 122        int             (*sendmsg)   (struct kiocb *iocb, struct socket *sock,
 123                                      struct msghdr *m, int total_len);
 124        int             (*recvmsg)   (struct kiocb *iocb, struct socket *sock,
 125                                      struct msghdr *m, int total_len,
 126                                      int flags);
 127        int             (*mmap)      (struct file *file, struct socket *sock,
 128                                      struct vm_area_struct * vma);
 129        ssize_t         (*sendpage)  (struct socket *sock, struct page *page,
 130                                      int offset, size_t size, int flags);
 131};
 132
 133struct net_proto_family {
 134        int             family;
 135        int             (*create)(struct socket *sock, int protocol);
 136        /* These are counters for the number of different methods of
 137           each we support */
 138        short           authentication;
 139        short           encryption;
 140        short           encrypt_net;
 141        struct module   *owner;
 142};
 143
 144struct iovec;
 145
 146extern int           sock_wake_async(struct socket *sk, int how, int band);
 147extern int           sock_register(struct net_proto_family *fam);
 148extern int           sock_unregister(int family);
 149extern struct socket *sock_alloc(void);
 150extern int           sock_create(int family, int type, int proto,
 151                                 struct socket **res);
 152extern void          sock_release(struct socket *sock);
 153extern int           sock_sendmsg(struct socket *sock, struct msghdr *msg,
 154                                  int len);
 155extern int           sock_recvmsg(struct socket *sock, struct msghdr *msg,
 156                                  int size, int flags);
 157extern int           sock_readv_writev(int type, struct inode *inode,
 158                                       struct file *file,
 159                                       const struct iovec *iov, long count,
 160                                       long size);
 161extern int           sock_map_fd(struct socket *sock);
 162extern struct socket *sockfd_lookup(int fd, int *err);
 163#define              sockfd_put(sock) fput(sock->file)
 164extern int           net_ratelimit(void);
 165extern unsigned long net_random(void);
 166extern void          net_srandom(unsigned long);
 167
 168#ifndef CONFIG_SMP
 169#define SOCKOPS_WRAPPED(name) name
 170#define SOCKOPS_WRAP(name, fam)
 171#else
 172
 173#define SOCKOPS_WRAPPED(name) __unlocked_##name
 174
 175#define SOCKCALL_WRAP(name, call, parms, args)          \
 176static int __lock_##name##_##call  parms                \
 177{                                                       \
 178        int ret;                                        \
 179        lock_kernel();                                  \
 180        ret = __unlocked_##name##_ops.call  args ;\
 181        unlock_kernel();                                \
 182        return ret;                                     \
 183}
 184
 185#define SOCKCALL_UWRAP(name, call, parms, args)         \
 186static unsigned int __lock_##name##_##call  parms       \
 187{                                                       \
 188        int ret;                                        \
 189        lock_kernel();                                  \
 190        ret = __unlocked_##name##_ops.call  args ;\
 191        unlock_kernel();                                \
 192        return ret;                                     \
 193}
 194
 195
 196#define SOCKOPS_WRAP(name, fam)                                 \
 197SOCKCALL_WRAP(name, release, (struct socket *sock), (sock))     \
 198SOCKCALL_WRAP(name, bind, (struct socket *sock, struct sockaddr *uaddr, int addr_len), \
 199              (sock, uaddr, addr_len))                          \
 200SOCKCALL_WRAP(name, connect, (struct socket *sock, struct sockaddr * uaddr, \
 201                              int addr_len, int flags),         \
 202              (sock, uaddr, addr_len, flags))                   \
 203SOCKCALL_WRAP(name, socketpair, (struct socket *sock1, struct socket *sock2), \
 204              (sock1, sock2))                                   \
 205SOCKCALL_WRAP(name, accept, (struct socket *sock, struct socket *newsock, \
 206                         int flags), (sock, newsock, flags)) \
 207SOCKCALL_WRAP(name, getname, (struct socket *sock, struct sockaddr *uaddr, \
 208                         int *addr_len, int peer), (sock, uaddr, addr_len, peer)) \
 209SOCKCALL_UWRAP(name, poll, (struct file *file, struct socket *sock, struct poll_table_struct *wait), \
 210              (file, sock, wait)) \
 211SOCKCALL_WRAP(name, ioctl, (struct socket *sock, unsigned int cmd, \
 212                         unsigned long arg), (sock, cmd, arg)) \
 213SOCKCALL_WRAP(name, listen, (struct socket *sock, int len), (sock, len)) \
 214SOCKCALL_WRAP(name, shutdown, (struct socket *sock, int flags), (sock, flags)) \
 215SOCKCALL_WRAP(name, setsockopt, (struct socket *sock, int level, int optname, \
 216                         char *optval, int optlen), (sock, level, optname, optval, optlen)) \
 217SOCKCALL_WRAP(name, getsockopt, (struct socket *sock, int level, int optname, \
 218                         char *optval, int *optlen), (sock, level, optname, optval, optlen)) \
 219SOCKCALL_WRAP(name, sendmsg, (struct kiocb *iocb, struct socket *sock, struct msghdr *m, int len), \
 220              (iocb, sock, m, len)) \
 221SOCKCALL_WRAP(name, recvmsg, (struct kiocb *iocb, struct socket *sock, struct msghdr *m, int len, int flags), \
 222              (iocb, sock, m, len, flags)) \
 223SOCKCALL_WRAP(name, mmap, (struct file *file, struct socket *sock, struct vm_area_struct *vma), \
 224              (file, sock, vma)) \
 225              \
 226static struct proto_ops name##_ops = {                  \
 227        .family         = fam,                          \
 228        .owner          = THIS_MODULE,                  \
 229        .release        = __lock_##name##_release,      \
 230        .bind           = __lock_##name##_bind,         \
 231        .connect        = __lock_##name##_connect,      \
 232        .socketpair     = __lock_##name##_socketpair,   \
 233        .accept         = __lock_##name##_accept,       \
 234        .getname        = __lock_##name##_getname,      \
 235        .poll           = __lock_##name##_poll,         \
 236        .ioctl          = __lock_##name##_ioctl,        \
 237        .listen         = __lock_##name##_listen,       \
 238        .shutdown       = __lock_##name##_shutdown,     \
 239        .setsockopt     = __lock_##name##_setsockopt,   \
 240        .getsockopt     = __lock_##name##_getsockopt,   \
 241        .sendmsg        = __lock_##name##_sendmsg,      \
 242        .recvmsg        = __lock_##name##_recvmsg,      \
 243        .mmap           = __lock_##name##_mmap,         \
 244};
 245#endif
 246
 247#define MODULE_ALIAS_NETPROTO(proto) \
 248        MODULE_ALIAS("net-pf-" __stringify(proto))
 249
 250#endif /* __KERNEL__ */
 251#endif  /* _LINUX_NET_H */
 252