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
  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/wait.h>
  22 #include <asm/socket.h>
  23
  24 struct poll_table_struct;
  25 struct inode;
  26 struct net;
  27
  28 #define NPROTO          34              /* 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
  48 typedef 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 #include <linux/stringify.h>
  60 #include <linux/random.h>
  61
  62 #define SOCK_ASYNC_NOSPACE      0
  63 #define SOCK_ASYNC_WAITDATA     1
  64 #define SOCK_NOSPACE            2
  65 #define SOCK_PASSCRED           3
  66 #define SOCK_PASSSEC            4
  67
  68 #ifndef ARCH_HAS_SOCKET_TYPES
  69 /**
  70  * enum sock_type - Socket types
  71  * @SOCK_STREAM: stream (connection) socket
  72  * @SOCK_DGRAM: datagram (conn.less) socket
  73  * @SOCK_RAW: raw socket
  74  * @SOCK_RDM: reliably-delivered message
  75  * @SOCK_SEQPACKET: sequential packet socket
  76  * @SOCK_DCCP: Datagram Congestion Control Protocol socket
  77  * @SOCK_PACKET: linux specific way of getting packets at the dev level.
  78  *                For writing rarp and other similar things on the user level.
  79  *
  80  * When adding some new socket type please
  81  * grep ARCH_HAS_SOCKET_TYPE include/asm-* /socket.h, at least MIPS
  82  * overrides this enum for binary compat reasons.
  83  */
  84 enum sock_type {
  85         SOCK_STREAM     = 1,
  86         SOCK_DGRAM      = 2,
  87         SOCK_RAW        = 3,
  88         SOCK_RDM        = 4,
  89         SOCK_SEQPACKET  = 5,
  90         SOCK_DCCP       = 6,
  91         SOCK_PACKET     = 10,
  92 };
  93
  94 #define SOCK_MAX (SOCK_PACKET + 1)
  95
  96 #endif /* ARCH_HAS_SOCKET_TYPES */
  97
  98 /**
  99  *  struct socket - general BSD socket
 100  *  @state: socket state (%SS_CONNECTED, etc)
 101  *  @flags: socket flags (%SOCK_ASYNC_NOSPACE, etc)
 102  *  @ops: protocol specific socket operations
 103  *  @fasync_list: Asynchronous wake up list
 104  *  @file: File back pointer for gc
 105  *  @sk: internal networking protocol agnostic socket representation
 106  *  @wait: wait queue for several uses
 107  *  @type: socket type (%SOCK_STREAM, etc)
 108  */
 109 struct socket {
 110         socket_state            state;
 111         unsigned long           flags;
 112         const struct proto_ops  *ops;
 113         struct fasync_struct    *fasync_list;
 114         struct file             *file;
 115         struct sock             *sk;
 116         wait_queue_head_t       wait;
 117         short                   type;
 118 };
 119
 120 struct vm_area_struct;
 121 struct page;
 122 struct kiocb;
 123 struct sockaddr;
 124 struct msghdr;
 125 struct module;
 126
 127 struct 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         int             (*compat_ioctl) (struct socket *sock, unsigned int cmd,
 149                                       unsigned long arg);
 150         int             (*listen)    (struct socket *sock, int len);
 151         int             (*shutdown)  (struct socket *sock, int flags);
 152         int             (*setsockopt)(struct socket *sock, int level,
 153                                       int optname, char __user *optval, int optlen);
 154         int             (*getsockopt)(struct socket *sock, int level,
 155                                       int optname, char __user *optval, int __user *optlen);
 156         int             (*compat_setsockopt)(struct socket *sock, int level,
 157                                       int optname, char __user *optval, int optlen);
 158         int             (*compat_getsockopt)(struct socket *sock, int level,
 159                                       int optname, char __user *optval, int __user *optlen);
 160         int             (*sendmsg)   (struct kiocb *iocb, struct socket *sock,
 161                                       struct msghdr *m, size_t total_len);
 162         int             (*recvmsg)   (struct kiocb *iocb, struct socket *sock,
 163                                       struct msghdr *m, size_t total_len,
 164                                       int flags);
 165         int             (*mmap)      (struct file *file, struct socket *sock,
 166                                       struct vm_area_struct * vma);
 167         ssize_t         (*sendpage)  (struct socket *sock, struct page *page,
 168                                       int offset, size_t size, int flags);
 169 };
 170
 171 struct net_proto_family {
 172         int             family;
 173         int             (*create)(struct net *net, struct socket *sock, int protocol);
 174         struct module   *owner;
 175 };
 176
 177 struct iovec;
 178 struct kvec;
 179
 180 extern int           sock_wake_async(struct socket *sk, int how, int band);
 181 extern int           sock_register(const struct net_proto_family *fam);
 182 extern void          sock_unregister(int family);
 183 extern int           sock_create(int family, int type, int proto,
 184                                  struct socket **res);
 185 extern int           sock_create_kern(int family, int type, int proto,
 186                                       struct socket **res);
 187 extern int           sock_create_lite(int family, int type, int proto,
 188                                       struct socket **res);
 189 extern void          sock_release(struct socket *sock);
 190 extern int           sock_sendmsg(struct socket *sock, struct msghdr *msg,
 191                                   size_t len);
 192 extern int           sock_recvmsg(struct socket *sock, struct msghdr *msg,
 193                                   size_t size, int flags);
 194 extern int           sock_map_fd(struct socket *sock);
 195 extern struct socket *sockfd_lookup(int fd, int *err);
 196 #define              sockfd_put(sock) fput(sock->file)
 197 extern int           net_ratelimit(void);
 198
 199 #define net_random()            random32()
 200 #define net_srandom(seed)       srandom32((__force u32)seed)
 201
 202 extern int           kernel_sendmsg(struct socket *sock, struct msghdr *msg,
 203                                     struct kvec *vec, size_t num, size_t len);
 204 extern int           kernel_recvmsg(struct socket *sock, struct msghdr *msg,
 205                                     struct kvec *vec, size_t num,
 206                                     size_t len, int flags);
 207
 208 extern int kernel_bind(struct socket *sock, struct sockaddr *addr,
 209                        int addrlen);
 210 extern int kernel_listen(struct socket *sock, int backlog);
 211 extern int kernel_accept(struct socket *sock, struct socket **newsock,
 212                          int flags);
 213 extern int kernel_connect(struct socket *sock, struct sockaddr *addr,
 214                           int addrlen, int flags);
 215 extern int kernel_getsockname(struct socket *sock, struct sockaddr *addr,
 216                               int *addrlen);
 217 extern int kernel_getpeername(struct socket *sock, struct sockaddr *addr,
 218                               int *addrlen);
 219 extern int kernel_getsockopt(struct socket *sock, int level, int optname,
 220                              char *optval, int *optlen);
 221 extern int kernel_setsockopt(struct socket *sock, int level, int optname,
 222                              char *optval, int optlen);
 223 extern int kernel_sendpage(struct socket *sock, struct page *page, int offset,
 224                            size_t size, int flags);
 225 extern int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg);
 226
 227 #ifndef CONFIG_SMP
 228 #define SOCKOPS_WRAPPED(name) name
 229 #define SOCKOPS_WRAP(name, fam)
 230 #else
 231
 232 #define SOCKOPS_WRAPPED(name) __unlocked_##name
 233
 234 #define SOCKCALL_WRAP(name, call, parms, args)          \
 235 static int __lock_##name##_##call  parms                \
 236 {                                                       \
 237         int ret;                                        \
 238         lock_kernel();                                  \
 239         ret = __unlocked_##name##_ops.call  args ;\
 240         unlock_kernel();                                \
 241         return ret;                                     \
 242 }
 243
 244 #define SOCKCALL_UWRAP(name, call, parms, args)         \
 245 static unsigned int __lock_##name##_##call  parms       \
 246 {                                                       \
 247         int ret;                                        \
 248         lock_kernel();                                  \
 249         ret = __unlocked_##name##_ops.call  args ;\
 250         unlock_kernel();                                \
 251         return ret;                                     \
 252 }
 253
 254
 255 #define SOCKOPS_WRAP(name, fam)                                 \
 256 SOCKCALL_WRAP(name, release, (struct socket *sock), (sock))     \
 257 SOCKCALL_WRAP(name, bind, (struct socket *sock, struct sockaddr *uaddr, int addr_len), \
 258               (sock, uaddr, addr_len))                          \
 259 SOCKCALL_WRAP(name, connect, (struct socket *sock, struct sockaddr * uaddr, \
 260                               int addr_len, int flags),         \
 261               (sock, uaddr, addr_len, flags))                   \
 262 SOCKCALL_WRAP(name, socketpair, (struct socket *sock1, struct socket *sock2), \
 263               (sock1, sock2))                                   \
 264 SOCKCALL_WRAP(name, accept, (struct socket *sock, struct socket *newsock, \
 265                          int flags), (sock, newsock, flags)) \
 266 SOCKCALL_WRAP(name, getname, (struct socket *sock, struct sockaddr *uaddr, \
 267                          int *addr_len, int peer), (sock, uaddr, addr_len, peer)) \
 268 SOCKCALL_UWRAP(name, poll, (struct file *file, struct socket *sock, struct poll_table_struct *wait), \
 269               (file, sock, wait)) \
 270 SOCKCALL_WRAP(name, ioctl, (struct socket *sock, unsigned int cmd, \
 271                          unsigned long arg), (sock, cmd, arg)) \
 272 SOCKCALL_WRAP(name, compat_ioctl, (struct socket *sock, unsigned int cmd, \
 273                          unsigned long arg), (sock, cmd, arg)) \
 274 SOCKCALL_WRAP(name, listen, (struct socket *sock, int len), (sock, len)) \
 275 SOCKCALL_WRAP(name, shutdown, (struct socket *sock, int flags), (sock, flags)) \
 276 SOCKCALL_WRAP(name, setsockopt, (struct socket *sock, int level, int optname, \
 277                          char __user *optval, int optlen), (sock, level, optname, optval, optlen)) \
 278 SOCKCALL_WRAP(name, getsockopt, (struct socket *sock, int level, int optname, \
 279                          char __user *optval, int __user *optlen), (sock, level, optname, optval, optlen)) \
 280 SOCKCALL_WRAP(name, sendmsg, (struct kiocb *iocb, struct socket *sock, struct msghdr *m, size_t len), \
 281               (iocb, sock, m, len)) \
 282 SOCKCALL_WRAP(name, recvmsg, (struct kiocb *iocb, struct socket *sock, struct msghdr *m, size_t len, int flags), \
 283               (iocb, sock, m, len, flags)) \
 284 SOCKCALL_WRAP(name, mmap, (struct file *file, struct socket *sock, struct vm_area_struct *vma), \
 285               (file, sock, vma)) \
 286               \
 287 static const struct proto_ops name##_ops = {                    \
 288         .family         = fam,                          \
 289         .owner          = THIS_MODULE,                  \
 290         .release        = __lock_##name##_release,      \
 291         .bind           = __lock_##name##_bind,         \
 292         .connect        = __lock_##name##_connect,      \
 293         .socketpair     = __lock_##name##_socketpair,   \
 294         .accept         = __lock_##name##_accept,       \
 295         .getname        = __lock_##name##_getname,      \
 296         .poll           = __lock_##name##_poll,         \
 297         .ioctl          = __lock_##name##_ioctl,        \
 298         .compat_ioctl   = __lock_##name##_compat_ioctl, \
 299         .listen         = __lock_##name##_listen,       \
 300         .shutdown       = __lock_##name##_shutdown,     \
 301         .setsockopt     = __lock_##name##_setsockopt,   \
 302         .getsockopt     = __lock_##name##_getsockopt,   \
 303         .sendmsg        = __lock_##name##_sendmsg,      \
 304         .recvmsg        = __lock_##name##_recvmsg,      \
 305         .mmap           = __lock_##name##_mmap,         \
 306 };
 307
 308 #endif
 309
 310 #define MODULE_ALIAS_NETPROTO(proto) \
 311         MODULE_ALIAS("net-pf-" __stringify(proto))
 312
 313 #define MODULE_ALIAS_NET_PF_PROTO(pf, proto) \
 314         MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto))
 315
 316 #ifdef CONFIG_SYSCTL
 317 #include <linux/sysctl.h>
 318 extern ctl_table net_table[];
 319 extern int net_msg_cost;
 320 extern int net_msg_burst;
 321 #endif
 322
 323 #endif /* __KERNEL__ */
 324 #endif  /* _LINUX_NET_H */