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/socket.h>
  23 #include <linux/wait.h>
  24
  25 struct poll_table_struct;
  26
  27 #define NPROTO          32              /* should be enough for now..   */
  28
  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
  48
  49 typedef enum {
  50   SS_FREE = 0,                          /* not allocated                */
  51   SS_UNCONNECTED,                       /* unconnected to any socket    */
  52   SS_CONNECTING,                        /* in process of connecting     */
  53   SS_CONNECTED,                         /* connected to socket          */
  54   SS_DISCONNECTING                      /* in process of disconnecting  */
  55 } socket_state;
  56
  57 #define __SO_ACCEPTCON  (1<<16)         /* performed a listen           */
  58
  59 #ifdef __KERNEL__
  60
  61 #define SOCK_ASYNC_NOSPACE      0
  62 #define SOCK_ASYNC_WAITDATA     1
  63 #define SOCK_NOSPACE            2
  64
  65 struct socket
  66 {
  67         socket_state            state;
  68
  69         unsigned long           flags;
  70         struct proto_ops        *ops;
  71         struct inode            *inode;
  72         struct fasync_struct    *fasync_list;   /* Asynchronous wake up list    */
  73         struct file             *file;          /* File back pointer for gc     */
  74         struct sock             *sk;
  75         wait_queue_head_t       wait;
  76
  77         short                   type;
  78         unsigned char           passcred;
  79 };
  80
  81 #define SOCK_INODE(S)   ((S)->inode)
  82
  83 struct scm_cookie;
  84 struct vm_area_struct;
  85
  86 struct proto_ops {
  87   int   family;
  88
  89   int   (*release)      (struct socket *sock);
  90   int   (*bind)         (struct socket *sock, struct sockaddr *umyaddr,
  91                          int sockaddr_len);
  92   int   (*connect)      (struct socket *sock, struct sockaddr *uservaddr,
  93                          int sockaddr_len, int flags);
  94   int   (*socketpair)   (struct socket *sock1, struct socket *sock2);
  95   int   (*accept)       (struct socket *sock, struct socket *newsock,
  96                          int flags);
  97   int   (*getname)      (struct socket *sock, struct sockaddr *uaddr,
  98                          int *usockaddr_len, int peer);
  99   unsigned int (*poll)  (struct file *file, struct socket *sock, struct poll_table_struct *wait);
 100   int   (*ioctl)        (struct socket *sock, unsigned int cmd,
 101                          unsigned long arg);
 102   int   (*listen)       (struct socket *sock, int len);
 103   int   (*shutdown)     (struct socket *sock, int flags);
 104   int   (*setsockopt)   (struct socket *sock, int level, int optname,
 105                          char *optval, int optlen);
 106   int   (*getsockopt)   (struct socket *sock, int level, int optname,
 107                          char *optval, int *optlen);
 108   int   (*sendmsg)      (struct socket *sock, struct msghdr *m, int total_len, struct scm_cookie *scm);
 109   int   (*recvmsg)      (struct socket *sock, struct msghdr *m, int total_len, int flags, struct scm_cookie *scm);
 110   int   (*mmap)         (struct file *file, struct socket *sock, struct vm_area_struct * vma);
 111 };
 112
 113 struct net_proto_family
 114 {
 115         int     family;
 116         int     (*create)(struct socket *sock, int protocol);
 117         /* These are counters for the number of different methods of
 118            each we support */
 119         short   authentication;
 120         short   encryption;
 121         short   encrypt_net;
 122 };
 123
 124 struct net_proto
 125 {
 126         const char *name;               /* Protocol name */
 127         void (*init_func)(struct net_proto *);  /* Bootstrap */
 128 };
 129
 130 extern int      sock_wake_async(struct socket *sk, int how, int band);
 131 extern int      sock_register(struct net_proto_family *fam);
 132 extern int      sock_unregister(int family);
 133 extern struct socket *sock_alloc(void);
 134 extern int      sock_create(int family, int type, int proto, struct socket **);
 135 extern void     sock_release(struct socket *);
 136 extern int      sock_sendmsg(struct socket *, struct msghdr *m, int len);
 137 extern int      sock_recvmsg(struct socket *, struct msghdr *m, int len, int flags);
 138 extern int      sock_readv_writev(int type, struct inode * inode, struct file * file,
 139                                   const struct iovec * iov, long count, long size);
 140
 141 extern int      net_ratelimit(void);
 142 extern unsigned long net_random(void);
 143 extern void net_srandom(unsigned long);
 144
 145 #ifndef CONFIG_SMP
 146 #define SOCKOPS_WRAPPED(name) name
 147 #define SOCKOPS_WRAP(name, fam)
 148 #else
 149
 150 #define SOCKOPS_WRAPPED(name) __unlocked_##name
 151
 152 #define SOCKCALL_WRAP(name, call, parms, args)          \
 153 static int __lock_##name##_##call  parms                \
 154 {                                                       \
 155         int ret;                                        \
 156         lock_kernel();                                  \
 157         ret = __unlocked_##name##_ops.call  args ;\
 158         unlock_kernel();                                \
 159         return ret;                                     \
 160 }
 161
 162 #define SOCKCALL_UWRAP(name, call, parms, args)         \
 163 static unsigned int __lock_##name##_##call  parms       \
 164 {                                                       \
 165         int ret;                                        \
 166         lock_kernel();                                  \
 167         ret = __unlocked_##name##_ops.call  args ;\
 168         unlock_kernel();                                \
 169         return ret;                                     \
 170 }
 171
 172
 173 #define SOCKOPS_WRAP(name, fam)                                 \
 174 SOCKCALL_WRAP(name, release, (struct socket *sock), (sock))     \
 175 SOCKCALL_WRAP(name, bind, (struct socket *sock, struct sockaddr *uaddr, int addr_len), \
 176               (sock, uaddr, addr_len))                          \
 177 SOCKCALL_WRAP(name, connect, (struct socket *sock, struct sockaddr * uaddr, \
 178                               int addr_len, int flags),         \
 179               (sock, uaddr, addr_len, flags))                   \
 180 SOCKCALL_WRAP(name, socketpair, (struct socket *sock1, struct socket *sock2), \
 181               (sock1, sock2))                                   \
 182 SOCKCALL_WRAP(name, accept, (struct socket *sock, struct socket *newsock, \
 183                          int flags), (sock, newsock, flags)) \
 184 SOCKCALL_WRAP(name, getname, (struct socket *sock, struct sockaddr *uaddr, \
 185                          int *addr_len, int peer), (sock, uaddr, addr_len, peer)) \
 186 SOCKCALL_UWRAP(name, poll, (struct file *file, struct socket *sock, struct poll_table_struct *wait), \
 187               (file, sock, wait)) \
 188 SOCKCALL_WRAP(name, ioctl, (struct socket *sock, unsigned int cmd, \
 189                          unsigned long arg), (sock, cmd, arg)) \
 190 SOCKCALL_WRAP(name, listen, (struct socket *sock, int len), (sock, len)) \
 191 SOCKCALL_WRAP(name, shutdown, (struct socket *sock, int flags), (sock, flags)) \
 192 SOCKCALL_WRAP(name, setsockopt, (struct socket *sock, int level, int optname, \
 193                          char *optval, int optlen), (sock, level, optname, optval, optlen)) \
 194 SOCKCALL_WRAP(name, getsockopt, (struct socket *sock, int level, int optname, \
 195                          char *optval, int *optlen), (sock, level, optname, optval, optlen)) \
 196 SOCKCALL_WRAP(name, sendmsg, (struct socket *sock, struct msghdr *m, int len, struct scm_cookie *scm), \
 197               (sock, m, len, scm)) \
 198 SOCKCALL_WRAP(name, recvmsg, (struct socket *sock, struct msghdr *m, int len, int flags, struct scm_cookie *scm), \
 199               (sock, m, len, flags, scm)) \
 200 SOCKCALL_WRAP(name, mmap, (struct file *file, struct socket *sock, struct vm_area_struct *vma), \
 201               (file, sock, vma)) \
 202               \
 203 static struct proto_ops name##_ops = {                  \
 204         family:         fam,                            \
 205                                                         \
 206         release:        __lock_##name##_release,        \
 207         bind:           __lock_##name##_bind,           \
 208         connect:        __lock_##name##_connect,        \
 209         socketpair:     __lock_##name##_socketpair,     \
 210         accept:         __lock_##name##_accept,         \
 211         getname:        __lock_##name##_getname,        \
 212         poll:           __lock_##name##_poll,           \
 213         ioctl:          __lock_##name##_ioctl,          \
 214         listen:         __lock_##name##_listen,         \
 215         shutdown:       __lock_##name##_shutdown,       \
 216         setsockopt:     __lock_##name##_setsockopt,     \
 217         getsockopt:     __lock_##name##_getsockopt,     \
 218         sendmsg:        __lock_##name##_sendmsg,        \
 219         recvmsg:        __lock_##name##_recvmsg,        \
 220         mmap:           __lock_##name##_mmap,           \
 221 };
 222 #endif
 223
 224
 225 #endif /* __KERNEL__ */
 226 #endif  /* _LINUX_NET_H */