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 file;
  69 struct net;
  70
  71 #define SOCK_ASYNC_NOSPACE      0
  72 #define SOCK_ASYNC_WAITDATA     1
  73 #define SOCK_NOSPACE            2
  74 #define SOCK_PASSCRED           3
  75 #define SOCK_PASSSEC            4
  76 #define SOCK_EXTERNALLY_ALLOCATED 5
  77
  78 #ifndef ARCH_HAS_SOCKET_TYPES
  79 /**
  80  * enum sock_type - Socket types
  81  * @SOCK_STREAM: stream (connection) socket
  82  * @SOCK_DGRAM: datagram (conn.less) socket
  83  * @SOCK_RAW: raw socket
  84  * @SOCK_RDM: reliably-delivered message
  85  * @SOCK_SEQPACKET: sequential packet socket
  86  * @SOCK_DCCP: Datagram Congestion Control Protocol socket
  87  * @SOCK_PACKET: linux specific way of getting packets at the dev level.
  88  *                For writing rarp and other similar things on the user level.
  89  *
  90  * When adding some new socket type please
  91  * grep ARCH_HAS_SOCKET_TYPE include/asm-* /socket.h, at least MIPS
  92  * overrides this enum for binary compat reasons.
  93  */
  94 enum sock_type {
  95         SOCK_STREAM     = 1,
  96         SOCK_DGRAM      = 2,
  97         SOCK_RAW        = 3,
  98         SOCK_RDM        = 4,
  99         SOCK_SEQPACKET  = 5,
 100         SOCK_DCCP       = 6,
 101         SOCK_PACKET     = 10,
 102 };
 103
 104 #define SOCK_MAX (SOCK_PACKET + 1)
 105 /* Mask which covers at least up to SOCK_MASK-1.  The
 106  * remaining bits are used as flags. */
 107 #define SOCK_TYPE_MASK 0xf
 108
 109 /* Flags for socket, socketpair, accept4 */
 110 #define SOCK_CLOEXEC    O_CLOEXEC
 111 #ifndef SOCK_NONBLOCK
 112 #define SOCK_NONBLOCK   O_NONBLOCK
 113 #endif
 114
 115 #endif /* ARCH_HAS_SOCKET_TYPES */
 116
 117 enum sock_shutdown_cmd {
 118         SHUT_RD         = 0,
 119         SHUT_WR         = 1,
 120         SHUT_RDWR       = 2,
 121 };
 122
 123 struct socket_wq {
 124         /* Note: wait MUST be first field of socket_wq */
 125         wait_queue_head_t       wait;
 126         struct fasync_struct    *fasync_list;
 127         struct rcu_head         rcu;
 128 } ____cacheline_aligned_in_smp;
 129
 130 /**
 131  *  struct socket - general BSD socket
 132  *  @state: socket state (%SS_CONNECTED, etc)
 133  *  @type: socket type (%SOCK_STREAM, etc)
 134  *  @flags: socket flags (%SOCK_ASYNC_NOSPACE, etc)
 135  *  @ops: protocol specific socket operations
 136  *  @file: File back pointer for gc
 137  *  @sk: internal networking protocol agnostic socket representation
 138  *  @wq: wait queue for several uses
 139  */
 140 struct socket {
 141         socket_state            state;
 142
 143         kmemcheck_bitfield_begin(type);
 144         short                   type;
 145         kmemcheck_bitfield_end(type);
 146
 147         unsigned long           flags;
 148
 149         struct socket_wq __rcu  *wq;
 150
 151         struct file             *file;
 152         struct sock             *sk;
 153         const struct proto_ops  *ops;
 154 };
 155
 156 struct vm_area_struct;
 157 struct page;
 158 struct kiocb;
 159 struct sockaddr;
 160 struct msghdr;
 161 struct module;
 162
 163 struct proto_ops {
 164         int             family;
 165         struct module   *owner;
 166         int             (*release)   (struct socket *sock);
 167         int             (*bind)      (struct socket *sock,
 168                                       struct sockaddr *myaddr,
 169                                       int sockaddr_len);
 170         int             (*connect)   (struct socket *sock,
 171                                       struct sockaddr *vaddr,
 172                                       int sockaddr_len, int flags);
 173         int             (*socketpair)(struct socket *sock1,
 174                                       struct socket *sock2);
 175         int             (*accept)    (struct socket *sock,
 176                                       struct socket *newsock, int flags);
 177         int             (*getname)   (struct socket *sock,
 178                                       struct sockaddr *addr,
 179                                       int *sockaddr_len, int peer);
 180         unsigned int    (*poll)      (struct file *file, struct socket *sock,
 181                                       struct poll_table_struct *wait);
 182         int             (*ioctl)     (struct socket *sock, unsigned int cmd,
 183                                       unsigned long arg);
 184 #ifdef CONFIG_COMPAT
 185         int             (*compat_ioctl) (struct socket *sock, unsigned int cmd,
 186                                       unsigned long arg);
 187 #endif
 188         int             (*listen)    (struct socket *sock, int len);
 189         int             (*shutdown)  (struct socket *sock, int flags);
 190         int             (*setsockopt)(struct socket *sock, int level,
 191                                       int optname, char __user *optval, unsigned int optlen);
 192         int             (*getsockopt)(struct socket *sock, int level,
 193                                       int optname, char __user *optval, int __user *optlen);
 194 #ifdef CONFIG_COMPAT
 195         int             (*compat_setsockopt)(struct socket *sock, int level,
 196                                       int optname, char __user *optval, unsigned int optlen);
 197         int             (*compat_getsockopt)(struct socket *sock, int level,
 198                                       int optname, char __user *optval, int __user *optlen);
 199 #endif
 200         int             (*sendmsg)   (struct kiocb *iocb, struct socket *sock,
 201                                       struct msghdr *m, size_t total_len);
 202         int             (*recvmsg)   (struct kiocb *iocb, struct socket *sock,
 203                                       struct msghdr *m, size_t total_len,
 204                                       int flags);
 205         int             (*mmap)      (struct file *file, struct socket *sock,
 206                                       struct vm_area_struct * vma);
 207         ssize_t         (*sendpage)  (struct socket *sock, struct page *page,
 208                                       int offset, size_t size, int flags);
 209         ssize_t         (*splice_read)(struct socket *sock,  loff_t *ppos,
 210                                        struct pipe_inode_info *pipe, size_t len, unsigned int flags);
 211         void            (*set_peek_off)(struct sock *sk, int val);
 212 };
 213
 214 #define DECLARE_SOCKADDR(type, dst, src)        \
 215         type dst = ({ __sockaddr_check_size(sizeof(*dst)); (type) src; })
 216
 217 struct net_proto_family {
 218         int             family;
 219         int             (*create)(struct net *net, struct socket *sock,
 220                                   int protocol, int kern);
 221         struct module   *owner;
 222 };
 223
 224 struct iovec;
 225 struct kvec;
 226
 227 enum {
 228         SOCK_WAKE_IO,
 229         SOCK_WAKE_WAITD,
 230         SOCK_WAKE_SPACE,
 231         SOCK_WAKE_URG,
 232 };
 233
 234 extern int           sock_wake_async(struct socket *sk, int how, int band);
 235 extern int           sock_register(const struct net_proto_family *fam);
 236 extern void          sock_unregister(int family);
 237 extern int           __sock_create(struct net *net, int family, int type, int proto,
 238                                  struct socket **res, int kern);
 239 extern int           sock_create(int family, int type, int proto,
 240                                  struct socket **res);
 241 extern int           sock_create_kern(int family, int type, int proto,
 242                                       struct socket **res);
 243 extern int           sock_create_lite(int family, int type, int proto,
 244                                       struct socket **res);
 245 extern void          sock_release(struct socket *sock);
 246 extern int           sock_sendmsg(struct socket *sock, struct msghdr *msg,
 247                                   size_t len);
 248 extern int           sock_recvmsg(struct socket *sock, struct msghdr *msg,
 249                                   size_t size, int flags);
 250 extern struct file  *sock_alloc_file(struct socket *sock, int flags, const char *dname);
 251 extern struct socket *sockfd_lookup(int fd, int *err);
 252 extern struct socket *sock_from_file(struct file *file, int *err);
 253 #define              sockfd_put(sock) fput(sock->file)
 254 extern int           net_ratelimit(void);
 255
 256 #define net_ratelimited_function(function, ...)                 \
 257 do {                                                            \
 258         if (net_ratelimit())                                    \
 259                 function(__VA_ARGS__);                          \
 260 } while (0)
 261
 262 #define net_emerg_ratelimited(fmt, ...)                         \
 263         net_ratelimited_function(pr_emerg, fmt, ##__VA_ARGS__)
 264 #define net_alert_ratelimited(fmt, ...)                         \
 265         net_ratelimited_function(pr_alert, fmt, ##__VA_ARGS__)
 266 #define net_crit_ratelimited(fmt, ...)                          \
 267         net_ratelimited_function(pr_crit, fmt, ##__VA_ARGS__)
 268 #define net_err_ratelimited(fmt, ...)                           \
 269         net_ratelimited_function(pr_err, fmt, ##__VA_ARGS__)
 270 #define net_notice_ratelimited(fmt, ...)                        \
 271         net_ratelimited_function(pr_notice, fmt, ##__VA_ARGS__)
 272 #define net_warn_ratelimited(fmt, ...)                          \
 273         net_ratelimited_function(pr_warn, fmt, ##__VA_ARGS__)
 274 #define net_info_ratelimited(fmt, ...)                          \
 275         net_ratelimited_function(pr_info, fmt, ##__VA_ARGS__)
 276 #define net_dbg_ratelimited(fmt, ...)                           \
 277         net_ratelimited_function(pr_debug, fmt, ##__VA_ARGS__)
 278
 279 #define net_random()            random32()
 280 #define net_srandom(seed)       srandom32((__force u32)seed)
 281
 282 extern int           kernel_sendmsg(struct socket *sock, struct msghdr *msg,
 283                                     struct kvec *vec, size_t num, size_t len);
 284 extern int           kernel_recvmsg(struct socket *sock, struct msghdr *msg,
 285                                     struct kvec *vec, size_t num,
 286                                     size_t len, int flags);
 287
 288 extern int kernel_bind(struct socket *sock, struct sockaddr *addr,
 289                        int addrlen);
 290 extern int kernel_listen(struct socket *sock, int backlog);
 291 extern int kernel_accept(struct socket *sock, struct socket **newsock,
 292                          int flags);
 293 extern int kernel_connect(struct socket *sock, struct sockaddr *addr,
 294                           int addrlen, int flags);
 295 extern int kernel_getsockname(struct socket *sock, struct sockaddr *addr,
 296                               int *addrlen);
 297 extern int kernel_getpeername(struct socket *sock, struct sockaddr *addr,
 298                               int *addrlen);
 299 extern int kernel_getsockopt(struct socket *sock, int level, int optname,
 300                              char *optval, int *optlen);
 301 extern int kernel_setsockopt(struct socket *sock, int level, int optname,
 302                              char *optval, unsigned int optlen);
 303 extern int kernel_sendpage(struct socket *sock, struct page *page, int offset,
 304                            size_t size, int flags);
 305 extern int kernel_sock_ioctl(struct socket *sock, int cmd, unsigned long arg);
 306 extern int kernel_sock_shutdown(struct socket *sock,
 307                                 enum sock_shutdown_cmd how);
 308
 309 #define MODULE_ALIAS_NETPROTO(proto) \
 310         MODULE_ALIAS("net-pf-" __stringify(proto))
 311
 312 #define MODULE_ALIAS_NET_PF_PROTO(pf, proto) \
 313         MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto))
 314
 315 #define MODULE_ALIAS_NET_PF_PROTO_TYPE(pf, proto, type) \
 316         MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto) \
 317                      "-type-" __stringify(type))
 318
 319 #define MODULE_ALIAS_NET_PF_PROTO_NAME(pf, proto, name) \
 320         MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto) \
 321                      name)
 322 #endif /* __KERNEL__ */
 323 #endif  /* _LINUX_NET_H */