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 <linux/socket.h>
  23 #include <linux/fcntl.h>        /* For O_CLOEXEC */
  24 #include <asm/socket.h>
  25
  26 struct poll_table_struct;
  27 struct pipe_inode_info;
  28 struct inode;
  29 struct net;
  30
  31 #define NPROTO          AF_MAX
  32
  33 #define SYS_SOCKET      1               /* sys_socket(2)                */
  34 #define SYS_BIND        2               /* sys_bind(2)                  */
  35 #define SYS_CONNECT     3               /* sys_connect(2)               */
  36 #define SYS_LISTEN      4               /* sys_listen(2)                */
  37 #define SYS_ACCEPT      5               /* sys_accept(2)                */
  38 #define SYS_GETSOCKNAME 6               /* sys_getsockname(2)           */
  39 #define SYS_GETPEERNAME 7               /* sys_getpeername(2)           */
  40 #define SYS_SOCKETPAIR  8               /* sys_socketpair(2)            */
  41 #define SYS_SEND        9               /* sys_send(2)                  */
  42 #define SYS_RECV        10              /* sys_recv(2)                  */
  43 #define SYS_SENDTO      11              /* sys_sendto(2)                */
  44 #define SYS_RECVFROM    12              /* sys_recvfrom(2)              */
  45 #define SYS_SHUTDOWN    13              /* sys_shutdown(2)              */
  46 #define SYS_SETSOCKOPT  14              /* sys_setsockopt(2)            */
  47 #define SYS_GETSOCKOPT  15              /* sys_getsockopt(2)            */
  48 #define SYS_SENDMSG     16              /* sys_sendmsg(2)               */
  49 #define SYS_RECVMSG     17              /* sys_recvmsg(2)               */
  50 #define SYS_PACCEPT     18              /* sys_paccept(2)               */
  51
  52 typedef enum {
  53         SS_FREE = 0,                    /* not allocated                */
  54         SS_UNCONNECTED,                 /* unconnected to any socket    */
  55         SS_CONNECTING,                  /* in process of connecting     */
  56         SS_CONNECTED,                   /* connected to socket          */
  57         SS_DISCONNECTING                /* in process of disconnecting  */
  58 } socket_state;
  59
  60 #define __SO_ACCEPTCON  (1 << 16)       /* performed a listen           */
  61
  62 #ifdef __KERNEL__
  63 #include <linux/stringify.h>
  64 #include <linux/random.h>
  65
  66 #define SOCK_ASYNC_NOSPACE      0
  67 #define SOCK_ASYNC_WAITDATA     1
  68 #define SOCK_NOSPACE            2
  69 #define SOCK_PASSCRED           3
  70 #define SOCK_PASSSEC            4
  71
  72 #ifndef ARCH_HAS_SOCKET_TYPES
  73 /**
  74  * enum sock_type - Socket types
  75  * @SOCK_STREAM: stream (connection) socket
  76  * @SOCK_DGRAM: datagram (conn.less) socket
  77  * @SOCK_RAW: raw socket
  78  * @SOCK_RDM: reliably-delivered message
  79  * @SOCK_SEQPACKET: sequential packet socket
  80  * @SOCK_DCCP: Datagram Congestion Control Protocol socket
  81  * @SOCK_PACKET: linux specific way of getting packets at the dev level.
  82  *                For writing rarp and other similar things on the user level.
  83  *
  84  * When adding some new socket type please
  85  * grep ARCH_HAS_SOCKET_TYPE include/asm-* /socket.h, at least MIPS
  86  * overrides this enum for binary compat reasons.
  87  */
  88 enum sock_type {
  89         SOCK_STREAM     = 1,
  90         SOCK_DGRAM      = 2,
  91         SOCK_RAW        = 3,
  92         SOCK_RDM        = 4,
  93         SOCK_SEQPACKET  = 5,
  94         SOCK_DCCP       = 6,
  95         SOCK_PACKET     = 10,
  96 };
  97
  98 #define SOCK_MAX (SOCK_PACKET + 1)
  99 /* Mask which covers at least up to SOCK_MASK-1.  The
 100  * remaining bits are used as flags. */
 101 #define SOCK_TYPE_MASK 0xf
 102
 103 /* Flags for socket, socketpair, paccept */
 104 #define SOCK_CLOEXEC    O_CLOEXEC
 105
 106 #endif /* ARCH_HAS_SOCKET_TYPES */
 107
 108 enum sock_shutdown_cmd {
 109         SHUT_RD         = 0,
 110         SHUT_WR         = 1,
 111         SHUT_RDWR       = 2,
 112 };
 113
 114 /**
 115  *  struct socket - general BSD socket
 116  *  @state: socket state (%SS_CONNECTED, etc)
 117  *  @type: socket type (%SOCK_STREAM, etc)
 118  *  @flags: socket flags (%SOCK_ASYNC_NOSPACE, etc)
 119  *  @ops: protocol specific socket operations
 120  *  @fasync_list: Asynchronous wake up list
 121  *  @file: File back pointer for gc
 122  *  @sk: internal networking protocol agnostic socket representation
 123  *  @wait: wait queue for several uses
 124  */
 125 struct socket {
 126         socket_state            state;
 127         short                   type;
 128         unsigned long           flags;
 129         const struct proto_ops  *ops;
 130         struct fasync_struct    *fasync_list;
 131         struct file             *file;
 132         struct sock             *sk;
 133         wait_queue_head_t       wait;
 134 };
 135
 136 struct vm_area_struct;
 137 struct page;
 138 struct kiocb;
 139 struct sockaddr;
 140 struct msghdr;
 141 struct module;
 142
 143 struct proto_ops {
 144         int             family;
 145         struct module   *owner;
 146         int             (*release)   (struct socket *sock);
 147         int             (*bind)      (struct socket *sock,
 148                                       struct sockaddr *myaddr,
 149                                       int sockaddr_len);
 150         int             (*connect)   (struct socket *sock,
 151                                       struct sockaddr *vaddr,
 152                                       int sockaddr_len, int flags);
 153         int             (*socketpair)(struct socket *sock1,
 154                                       struct socket *sock2);
 155         int             (*accept)    (struct socket *sock,
 156                                       struct socket *newsock, int flags);
 157         int             (*getname)   (struct socket *sock,
 158                                       struct sockaddr *addr,
 159                                       int *sockaddr_len, int peer);
 160         unsigned int    (*poll)      (struct file *file, struct socket *sock,
 161                                       struct poll_table_struct *wait);
 162         int             (*ioctl)     (struct socket *sock, unsigned int cmd,
 163                                       unsigned long arg);
 164         int             (*compat_ioctl) (struct socket *sock, unsigned int cmd,
 165                                       unsigned long arg);
 166         int             (*listen)    (struct socket *sock, int len);
 167         int             (*shutdown)  (struct socket *sock, int flags);
 168         int             (*setsockopt)(struct socket *sock, int level,
 169                                       int optname, char __user *optval, int optlen);
 170         int             (*getsockopt)(struct socket *sock, int level,
 171                                       int optname, char __user *optval, int __user *optlen);
 172         int             (*compat_setsockopt)(struct socket *sock, int level,
 173                                       int optname, char __user *optval, int optlen);
 174         int             (*compat_getsockopt)(struct socket *sock, int level,
 175                                       int optname, char __user *optval, int __user *optlen);
 176         int             (*sendmsg)   (struct kiocb *iocb, struct socket *sock,
 177                                       struct msghdr *m, size_t total_len);
 178         int             (*recvmsg)   (struct kiocb *iocb, struct socket *sock,
 179                                       struct msghdr *m, size_t total_len,
 180                                       int flags);
 181         int             (*mmap)      (struct file *file, struct socket *sock,
 182                                       struct vm_area_struct * vma);
 183         ssize_t         (*sendpage)  (struct socket *sock, struct page *page,
 184                                       int offset, size_t size, int flags);
 185         ssize_t         (*splice_read)(struct socket *sock,  loff_t *ppos,
 186                                        struct pipe_inode_info *pipe, size_t len, unsigned int flags);
 187 };
 188
 189 struct net_proto_family {
 190         int             family;
 191         int             (*create)(struct net *net, struct socket *sock, int protocol);
 192         struct module   *owner;
 193 };
 194
 195 struct iovec;
 196 struct kvec;
 197
 198 enum {
 199         SOCK_WAKE_IO,
 200         SOCK_WAKE_WAITD,
 201         SOCK_WAKE_SPACE,
 202         SOCK_WAKE_URG,
 203 };
 204
 205 extern int           sock_wake_async(struct socket *sk, int how, int band);
 206 extern int           sock_register(const struct net_proto_family *fam);
 207 extern void          sock_unregister(int family);
 208 extern int           sock_create(int family, int type, int proto,
 209                                  struct socket **res);
 210 extern int           sock_create_kern(int family, int type, int proto,
 211                                       struct socket **res);
 212 extern int           sock_create_lite(int family, int type, int proto,
 213                                       struct socket **res);
 214 extern void          sock_release(struct socket *sock);
 215 extern int           sock_sendmsg(struct socket *sock, struct msghdr *msg,
 216                                   size_t len);
 217 extern int           sock_recvmsg(struct socket *sock, struct msghdr *msg,
 218                                   size_t size, int flags);
 219 extern int           sock_map_fd(struct socket *sock, int flags);
 220 extern struct socket *sockfd_lookup(int fd, int *err);
 221 #define              sockfd_put(sock) fput(sock->file)
 222 extern int           net_ratelimit(void);
 223 extern long          do_accept(int fd, struct sockaddr __user *upeer_sockaddr,
 224                                int __user *upeer_addrlen, int flags);
 225
 226 #define net_random()            random32()
 227 #define net_srandom(seed)       srandom32((__force u32)seed)
 228
 229 extern int           kernel_sendmsg(struct socket *sock, struct msghdr *msg,
 230                                     struct kvec *vec, size_t num, size_t len);
 231 extern int           kernel_recvmsg(struct socket *sock, struct msghdr *msg,
 232                                     struct kvec *vec, size_t num,
 233                                     size_t len, int flags);
 234
 235 extern int kernel_bind(struct socket *sock, struct sockaddr *addr,
 236                        int addrlen);
 237 extern int kernel_listen(struct socket *sock, int backlog);
 238 extern int kernel_accept(struct socket *sock, struct socket **newsock,
 239                          int flags);
 240 extern int kernel_connect(struct socket *sock, struct sockaddr *addr,
 241                           int addrlen, int flags);
 242 extern int kernel_getsockname(struct socket *sock, struct sockaddr *addr,
 243                               int *addrlen);
 244 extern int kernel_getpeername(struct socket *sock, struct sockaddr *addr,
 245                               int *addrlen);
 246 extern int kernel_getsockopt(struct socket *sock, int level, int optname,
 247                              char *optval, int *optlen);
 248 extern int kernel_setsockopt(struct socket *sock, int level, int optname,
 249                              char *optval, int optlen);
 250 extern int kernel_sendpage(struct socket *sock, struct page *page, int offset,
 251                            size_t size, int flags);
 252 extern int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg);
 253 extern int kernel_sock_shutdown(struct socket *sock,
 254                                 enum sock_shutdown_cmd how);
 255
 256 #ifndef CONFIG_SMP
 257 #define SOCKOPS_WRAPPED(name) name
 258 #define SOCKOPS_WRAP(name, fam)
 259 #else
 260
 261 #define SOCKOPS_WRAPPED(name) __unlocked_##name
 262
 263 #define SOCKCALL_WRAP(name, call, parms, args)          \
 264 static int __lock_##name##_##call  parms                \
 265 {                                                       \
 266         int ret;                                        \
 267         lock_kernel();                                  \
 268         ret = __unlocked_##name##_ops.call  args ;\
 269         unlock_kernel();                                \
 270         return ret;                                     \
 271 }
 272
 273 #define SOCKCALL_UWRAP(name, call, parms, args)         \
 274 static unsigned int __lock_##name##_##call  parms       \
 275 {                                                       \
 276         int ret;                                        \
 277         lock_kernel();                                  \
 278         ret = __unlocked_##name##_ops.call  args ;\
 279         unlock_kernel();                                \
 280         return ret;                                     \
 281 }
 282
 283
 284 #define SOCKOPS_WRAP(name, fam)                                 \
 285 SOCKCALL_WRAP(name, release, (struct socket *sock), (sock))     \
 286 SOCKCALL_WRAP(name, bind, (struct socket *sock, struct sockaddr *uaddr, int addr_len), \
 287               (sock, uaddr, addr_len))                          \
 288 SOCKCALL_WRAP(name, connect, (struct socket *sock, struct sockaddr * uaddr, \
 289                               int addr_len, int flags),         \
 290               (sock, uaddr, addr_len, flags))                   \
 291 SOCKCALL_WRAP(name, socketpair, (struct socket *sock1, struct socket *sock2), \
 292               (sock1, sock2))                                   \
 293 SOCKCALL_WRAP(name, accept, (struct socket *sock, struct socket *newsock, \
 294                          int flags), (sock, newsock, flags)) \
 295 SOCKCALL_WRAP(name, getname, (struct socket *sock, struct sockaddr *uaddr, \
 296                          int *addr_len, int peer), (sock, uaddr, addr_len, peer)) \
 297 SOCKCALL_UWRAP(name, poll, (struct file *file, struct socket *sock, struct poll_table_struct *wait), \
 298               (file, sock, wait)) \
 299 SOCKCALL_WRAP(name, ioctl, (struct socket *sock, unsigned int cmd, \
 300                          unsigned long arg), (sock, cmd, arg)) \
 301 SOCKCALL_WRAP(name, compat_ioctl, (struct socket *sock, unsigned int cmd, \
 302                          unsigned long arg), (sock, cmd, arg)) \
 303 SOCKCALL_WRAP(name, listen, (struct socket *sock, int len), (sock, len)) \
 304 SOCKCALL_WRAP(name, shutdown, (struct socket *sock, int flags), (sock, flags)) \
 305 SOCKCALL_WRAP(name, setsockopt, (struct socket *sock, int level, int optname, \
 306                          char __user *optval, int optlen), (sock, level, optname, optval, optlen)) \
 307 SOCKCALL_WRAP(name, getsockopt, (struct socket *sock, int level, int optname, \
 308                          char __user *optval, int __user *optlen), (sock, level, optname, optval, optlen)) \
 309 SOCKCALL_WRAP(name, sendmsg, (struct kiocb *iocb, struct socket *sock, struct msghdr *m, size_t len), \
 310               (iocb, sock, m, len)) \
 311 SOCKCALL_WRAP(name, recvmsg, (struct kiocb *iocb, struct socket *sock, struct msghdr *m, size_t len, int flags), \
 312               (iocb, sock, m, len, flags)) \
 313 SOCKCALL_WRAP(name, mmap, (struct file *file, struct socket *sock, struct vm_area_struct *vma), \
 314               (file, sock, vma)) \
 315               \
 316 static const struct proto_ops name##_ops = {                    \
 317         .family         = fam,                          \
 318         .owner          = THIS_MODULE,                  \
 319         .release        = __lock_##name##_release,      \
 320         .bind           = __lock_##name##_bind,         \
 321         .connect        = __lock_##name##_connect,      \
 322         .socketpair     = __lock_##name##_socketpair,   \
 323         .accept         = __lock_##name##_accept,       \
 324         .getname        = __lock_##name##_getname,      \
 325         .poll           = __lock_##name##_poll,         \
 326         .ioctl          = __lock_##name##_ioctl,        \
 327         .compat_ioctl   = __lock_##name##_compat_ioctl, \
 328         .listen         = __lock_##name##_listen,       \
 329         .shutdown       = __lock_##name##_shutdown,     \
 330         .setsockopt     = __lock_##name##_setsockopt,   \
 331         .getsockopt     = __lock_##name##_getsockopt,   \
 332         .sendmsg        = __lock_##name##_sendmsg,      \
 333         .recvmsg        = __lock_##name##_recvmsg,      \
 334         .mmap           = __lock_##name##_mmap,         \
 335 };
 336
 337 #endif
 338
 339 #define MODULE_ALIAS_NETPROTO(proto) \
 340         MODULE_ALIAS("net-pf-" __stringify(proto))
 341
 342 #define MODULE_ALIAS_NET_PF_PROTO(pf, proto) \
 343         MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto))
 344
 345 #define MODULE_ALIAS_NET_PF_PROTO_TYPE(pf, proto, type) \
 346         MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto) \
 347                      "-type-" __stringify(type))
 348
 349 #ifdef CONFIG_SYSCTL
 350 #include <linux/sysctl.h>
 351 extern int net_msg_cost;
 352 extern int net_msg_burst;
 353 #endif
 354
 355 #endif /* __KERNEL__ */
 356 #endif  /* _LINUX_NET_H */