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/socket.h>
  22 #include <asm/socket.h>
  23
  24 #define NPROTO          AF_MAX
  25
  26 #define SYS_SOCKET      1               /* sys_socket(2)                */
  27 #define SYS_BIND        2               /* sys_bind(2)                  */
  28 #define SYS_CONNECT     3               /* sys_connect(2)               */
  29 #define SYS_LISTEN      4               /* sys_listen(2)                */
  30 #define SYS_ACCEPT      5               /* sys_accept(2)                */
  31 #define SYS_GETSOCKNAME 6               /* sys_getsockname(2)           */
  32 #define SYS_GETPEERNAME 7               /* sys_getpeername(2)           */
  33 #define SYS_SOCKETPAIR  8               /* sys_socketpair(2)            */
  34 #define SYS_SEND        9               /* sys_send(2)                  */
  35 #define SYS_RECV        10              /* sys_recv(2)                  */
  36 #define SYS_SENDTO      11              /* sys_sendto(2)                */
  37 #define SYS_RECVFROM    12              /* sys_recvfrom(2)              */
  38 #define SYS_SHUTDOWN    13              /* sys_shutdown(2)              */
  39 #define SYS_SETSOCKOPT  14              /* sys_setsockopt(2)            */
  40 #define SYS_GETSOCKOPT  15              /* sys_getsockopt(2)            */
  41 #define SYS_SENDMSG     16              /* sys_sendmsg(2)               */
  42 #define SYS_RECVMSG     17              /* sys_recvmsg(2)               */
  43 #define SYS_ACCEPT4     18              /* sys_accept4(2)               */
  44 #define SYS_RECVMMSG    19              /* sys_recvmmsg(2)              */
  45 #define SYS_SENDMMSG    20              /* sys_sendmmsg(2)              */
  46
  47 typedef enum {
  48         SS_FREE = 0,                    /* not allocated                */
  49         SS_UNCONNECTED,                 /* unconnected to any socket    */
  50         SS_CONNECTING,                  /* in process of connecting     */
  51         SS_CONNECTED,                   /* connected to socket          */
  52         SS_DISCONNECTING                /* in process of disconnecting  */
  53 } socket_state;
  54
  55 #define __SO_ACCEPTCON  (1 << 16)       /* performed a listen           */
  56
  57 #ifdef __KERNEL__
  58 #include <linux/stringify.h>
  59 #include <linux/random.h>
  60 #include <linux/wait.h>
  61 #include <linux/fcntl.h>        /* For O_CLOEXEC and O_NONBLOCK */
  62 #include <linux/kmemcheck.h>
  63 #include <linux/rcupdate.h>
  64
  65 struct poll_table_struct;
  66 struct pipe_inode_info;
  67 struct inode;
  68 struct net;
  69
  70 #define SOCK_ASYNC_NOSPACE      0
  71 #define SOCK_ASYNC_WAITDATA     1
  72 #define SOCK_NOSPACE            2
  73 #define SOCK_PASSCRED           3
  74 #define SOCK_PASSSEC            4
  75
  76 #ifndef ARCH_HAS_SOCKET_TYPES
  77 /**
  78  * enum sock_type - Socket types
  79  * @SOCK_STREAM: stream (connection) socket
  80  * @SOCK_DGRAM: datagram (conn.less) socket
  81  * @SOCK_RAW: raw socket
  82  * @SOCK_RDM: reliably-delivered message
  83  * @SOCK_SEQPACKET: sequential packet socket
  84  * @SOCK_DCCP: Datagram Congestion Control Protocol socket
  85  * @SOCK_PACKET: linux specific way of getting packets at the dev level.
  86  *                For writing rarp and other similar things on the user level.
  87  *
  88  * When adding some new socket type please
  89  * grep ARCH_HAS_SOCKET_TYPE include/asm-* /socket.h, at least MIPS
  90  * overrides this enum for binary compat reasons.
  91  */
  92 enum sock_type {
  93         SOCK_STREAM     = 1,
  94         SOCK_DGRAM      = 2,
  95         SOCK_RAW        = 3,
  96         SOCK_RDM        = 4,
  97         SOCK_SEQPACKET  = 5,
  98         SOCK_DCCP       = 6,
  99         SOCK_PACKET     = 10,
 100 };
 101
 102 #define SOCK_MAX (SOCK_PACKET + 1)
 103 /* Mask which covers at least up to SOCK_MASK-1.  The
 104  * remaining bits are used as flags. */
 105 #define SOCK_TYPE_MASK 0xf
 106
 107 /* Flags for socket, socketpair, accept4 */
 108 #define SOCK_CLOEXEC    O_CLOEXEC
 109 #ifndef SOCK_NONBLOCK
 110 #define SOCK_NONBLOCK   O_NONBLOCK
 111 #endif
 112
 113 #endif /* ARCH_HAS_SOCKET_TYPES */
 114
 115 enum sock_shutdown_cmd {
 116         SHUT_RD         = 0,
 117         SHUT_WR         = 1,
 118         SHUT_RDWR       = 2,
 119 };
 120
 121 struct socket_wq {
 122         /* Note: wait MUST be first field of socket_wq */
 123         wait_queue_head_t       wait;
 124         struct fasync_struct    *fasync_list;
 125         struct rcu_head         rcu;
 126 } ____cacheline_aligned_in_smp;
 127
 128 /**
 129  *  struct socket - general BSD socket
 130  *  @state: socket state (%SS_CONNECTED, etc)
 131  *  @type: socket type (%SOCK_STREAM, etc)
 132  *  @flags: socket flags (%SOCK_ASYNC_NOSPACE, etc)
 133  *  @ops: protocol specific socket operations
 134  *  @file: File back pointer for gc
 135  *  @sk: internal networking protocol agnostic socket representation
 136  *  @wq: wait queue for several uses
 137  */
 138 struct socket {
 139         socket_state            state;
 140
 141         kmemcheck_bitfield_begin(type);
 142         short                   type;
 143         kmemcheck_bitfield_end(type);
 144
 145         unsigned long           flags;
 146
 147         struct socket_wq __rcu  *wq;
 148
 149         struct file             *file;
 150         struct sock             *sk;
 151         const struct proto_ops  *ops;
 152 };
 153
 154 struct vm_area_struct;
 155 struct page;
 156 struct kiocb;
 157 struct sockaddr;
 158 struct msghdr;
 159 struct module;
 160
 161 struct proto_ops {
 162         int             family;
 163         struct module   *owner;
 164         int             (*release)   (struct socket *sock);
 165         int             (*bind)      (struct socket *sock,
 166                                       struct sockaddr *myaddr,
 167                                       int sockaddr_len);
 168         int             (*connect)   (struct socket *sock,
 169                                       struct sockaddr *vaddr,
 170                                       int sockaddr_len, int flags);
 171         int             (*socketpair)(struct socket *sock1,
 172                                       struct socket *sock2);
 173         int             (*accept)    (struct socket *sock,
 174                                       struct socket *newsock, int flags);
 175         int             (*getname)   (struct socket *sock,
 176                                       struct sockaddr *addr,
 177                                       int *sockaddr_len, int peer);
 178         unsigned int    (*poll)      (struct file *file, struct socket *sock,
 179                                       struct poll_table_struct *wait);
 180         int             (*ioctl)     (struct socket *sock, unsigned int cmd,
 181                                       unsigned long arg);
 182 #ifdef CONFIG_COMPAT
 183         int             (*compat_ioctl) (struct socket *sock, unsigned int cmd,
 184                                       unsigned long arg);
 185 #endif
 186         int             (*listen)    (struct socket *sock, int len);
 187         int             (*shutdown)  (struct socket *sock, int flags);
 188         int             (*setsockopt)(struct socket *sock, int level,
 189                                       int optname, char __user *optval, unsigned int optlen);
 190         int             (*getsockopt)(struct socket *sock, int level,
 191                                       int optname, char __user *optval, int __user *optlen);
 192 #ifdef CONFIG_COMPAT
 193         int             (*compat_setsockopt)(struct socket *sock, int level,
 194                                       int optname, char __user *optval, unsigned int optlen);
 195         int             (*compat_getsockopt)(struct socket *sock, int level,
 196                                       int optname, char __user *optval, int __user *optlen);
 197 #endif
 198         int             (*sendmsg)   (struct kiocb *iocb, struct socket *sock,
 199                                       struct msghdr *m, size_t total_len);
 200         int             (*recvmsg)   (struct kiocb *iocb, struct socket *sock,
 201                                       struct msghdr *m, size_t total_len,
 202                                       int flags);
 203         int             (*mmap)      (struct file *file, struct socket *sock,
 204                                       struct vm_area_struct * vma);
 205         ssize_t         (*sendpage)  (struct socket *sock, struct page *page,
 206                                       int offset, size_t size, int flags);
 207         ssize_t         (*splice_read)(struct socket *sock,  loff_t *ppos,
 208                                        struct pipe_inode_info *pipe, size_t len, unsigned int flags);
 209 };
 210
 211 #define DECLARE_SOCKADDR(type, dst, src)        \
 212         type dst = ({ __sockaddr_check_size(sizeof(*dst)); (type) src; })
 213
 214 struct net_proto_family {
 215         int             family;
 216         int             (*create)(struct net *net, struct socket *sock,
 217                                   int protocol, int kern);
 218         struct module   *owner;
 219 };
 220
 221 struct iovec;
 222 struct kvec;
 223
 224 enum {
 225         SOCK_WAKE_IO,
 226         SOCK_WAKE_WAITD,
 227         SOCK_WAKE_SPACE,
 228         SOCK_WAKE_URG,
 229 };
 230
 231 extern int           sock_wake_async(struct socket *sk, int how, int band);
 232 extern int           sock_register(const struct net_proto_family *fam);
 233 extern void          sock_unregister(int family);
 234 extern int           __sock_create(struct net *net, int family, int type, int proto,
 235                                  struct socket **res, int kern);
 236 extern int           sock_create(int family, int type, int proto,
 237                                  struct socket **res);
 238 extern int           sock_create_kern(int family, int type, int proto,
 239                                       struct socket **res);
 240 extern int           sock_create_lite(int family, int type, int proto,
 241                                       struct socket **res);
 242 extern void          sock_release(struct socket *sock);
 243 extern int           sock_sendmsg(struct socket *sock, struct msghdr *msg,
 244                                   size_t len);
 245 extern int           sock_recvmsg(struct socket *sock, struct msghdr *msg,
 246                                   size_t size, int flags);
 247 extern int           sock_map_fd(struct socket *sock, int flags);
 248 extern struct socket *sockfd_lookup(int fd, int *err);
 249 #define              sockfd_put(sock) fput(sock->file)
 250 extern int           net_ratelimit(void);
 251
 252 #define net_random()            random32()
 253 #define net_srandom(seed)       srandom32((__force u32)seed)
 254
 255 extern int           kernel_sendmsg(struct socket *sock, struct msghdr *msg,
 256                                     struct kvec *vec, size_t num, size_t len);
 257 extern int           kernel_recvmsg(struct socket *sock, struct msghdr *msg,
 258                                     struct kvec *vec, size_t num,
 259                                     size_t len, int flags);
 260
 261 extern int kernel_bind(struct socket *sock, struct sockaddr *addr,
 262                        int addrlen);
 263 extern int kernel_listen(struct socket *sock, int backlog);
 264 extern int kernel_accept(struct socket *sock, struct socket **newsock,
 265                          int flags);
 266 extern int kernel_connect(struct socket *sock, struct sockaddr *addr,
 267                           int addrlen, int flags);
 268 extern int kernel_getsockname(struct socket *sock, struct sockaddr *addr,
 269                               int *addrlen);
 270 extern int kernel_getpeername(struct socket *sock, struct sockaddr *addr,
 271                               int *addrlen);
 272 extern int kernel_getsockopt(struct socket *sock, int level, int optname,
 273                              char *optval, int *optlen);
 274 extern int kernel_setsockopt(struct socket *sock, int level, int optname,
 275                              char *optval, unsigned int optlen);
 276 extern int kernel_sendpage(struct socket *sock, struct page *page, int offset,
 277                            size_t size, int flags);
 278 extern int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg);
 279 extern int kernel_sock_shutdown(struct socket *sock,
 280                                 enum sock_shutdown_cmd how);
 281
 282 #define MODULE_ALIAS_NETPROTO(proto) \
 283         MODULE_ALIAS("net-pf-" __stringify(proto))
 284
 285 #define MODULE_ALIAS_NET_PF_PROTO(pf, proto) \
 286         MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto))
 287
 288 #define MODULE_ALIAS_NET_PF_PROTO_TYPE(pf, proto, type) \
 289         MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto) \
 290                      "-type-" __stringify(type))
 291
 292 #endif /* __KERNEL__ */
 293 #endif  /* _LINUX_NET_H */