include/linux/socket.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _LINUX_SOCKET_H
   3 #define _LINUX_SOCKET_H
   4
   5
   6 #include <asm/socket.h>                 /* arch-dependent defines       */
   7 #include <linux/sockios.h>              /* the SIOCxxx I/O controls     */
   8 #include <linux/uio.h>                  /* iovec support                */
   9 #include <linux/types.h>                /* pid_t                        */
  10 #include <linux/compiler.h>             /* __user                       */
  11 #include <uapi/linux/socket.h>
  12
  13 struct file;
  14 struct pid;
  15 struct cred;
  16 struct socket;
  17 struct sock;
  18 struct sk_buff;
  19 struct proto_accept_arg;
  20
  21 #define __sockaddr_check_size(size)     \
  22         BUILD_BUG_ON(((size) > sizeof(struct __kernel_sockaddr_storage)))
  23
  24 #ifdef CONFIG_PROC_FS
  25 struct seq_file;
  26 extern void socket_seq_show(struct seq_file *seq);
  27 #endif
  28
  29 typedef __kernel_sa_family_t    sa_family_t;
  30
  31 /*
  32  *      1003.1g requires sa_family_t and that sa_data is char.
  33  */
  34
  35 struct sockaddr {
  36         sa_family_t     sa_family;      /* address family, AF_xxx       */
  37         union {
  38                 char sa_data_min[14];           /* Minimum 14 bytes of protocol address */
  39                 DECLARE_FLEX_ARRAY(char, sa_data);
  40         };
  41 };
  42
  43 struct linger {
  44         int             l_onoff;        /* Linger active                */
  45         int             l_linger;       /* How long to linger for       */
  46 };
  47
  48 #define sockaddr_storage __kernel_sockaddr_storage
  49
  50 /*
  51  *      As we do 4.4BSD message passing we use a 4.4BSD message passing
  52  *      system, not 4.3. Thus msg_accrights(len) are now missing. They
  53  *      belong in an obscure libc emulation or the bin.
  54  */
  55
  56 struct msghdr {
  57         void            *msg_name;      /* ptr to socket address structure */
  58         int             msg_namelen;    /* size of socket address structure */
  59
  60         int             msg_inq;        /* output, data left in socket */
  61
  62         struct iov_iter msg_iter;       /* data */
  63
  64         /*
  65          * Ancillary data. msg_control_user is the user buffer used for the
  66          * recv* side when msg_control_is_user is set, msg_control is the kernel
  67          * buffer used for all other cases.
  68          */
  69         union {
  70                 void            *msg_control;
  71                 void __user     *msg_control_user;
  72         };
  73         bool            msg_control_is_user : 1;
  74         bool            msg_get_inq : 1;/* return INQ after receive */
  75         unsigned int    msg_flags;      /* flags on received message */
  76         __kernel_size_t msg_controllen; /* ancillary data buffer length */
  77         struct kiocb    *msg_iocb;      /* ptr to iocb for async requests */
  78         struct ubuf_info *msg_ubuf;
  79         int (*sg_from_iter)(struct sk_buff *skb,
  80                             struct iov_iter *from, size_t length);
  81 };
  82
  83 struct user_msghdr {
  84         void            __user *msg_name;       /* ptr to socket address structure */
  85         int             msg_namelen;            /* size of socket address structure */
  86         struct iovec    __user *msg_iov;        /* scatter/gather array */
  87         __kernel_size_t msg_iovlen;             /* # elements in msg_iov */
  88         void            __user *msg_control;    /* ancillary data */
  89         __kernel_size_t msg_controllen;         /* ancillary data buffer length */
  90         unsigned int    msg_flags;              /* flags on received message */
  91 };
  92
  93 /* For recvmmsg/sendmmsg */
  94 struct mmsghdr {
  95         struct user_msghdr  msg_hdr;
  96         unsigned int        msg_len;
  97 };
  98
  99 /*
 100  *      POSIX 1003.1g - ancillary data object information
 101  *      Ancillary data consists of a sequence of pairs of
 102  *      (cmsghdr, cmsg_data[])
 103  */
 104
 105 struct cmsghdr {
 106         __kernel_size_t cmsg_len;       /* data byte count, including hdr */
 107         int             cmsg_level;     /* originating protocol */
 108         int             cmsg_type;      /* protocol-specific type */
 109 };
 110
 111 /*
 112  *      Ancillary data object information MACROS
 113  *      Table 5-14 of POSIX 1003.1g
 114  */
 115
 116 #define __CMSG_NXTHDR(ctl, len, cmsg) __cmsg_nxthdr((ctl),(len),(cmsg))
 117 #define CMSG_NXTHDR(mhdr, cmsg) cmsg_nxthdr((mhdr), (cmsg))
 118
 119 #define CMSG_ALIGN(len) ( ((len)+sizeof(long)-1) & ~(sizeof(long)-1) )
 120
 121 #define CMSG_DATA(cmsg) \
 122         ((void *)(cmsg) + sizeof(struct cmsghdr))
 123 #define CMSG_USER_DATA(cmsg) \
 124         ((void __user *)(cmsg) + sizeof(struct cmsghdr))
 125 #define CMSG_SPACE(len) (sizeof(struct cmsghdr) + CMSG_ALIGN(len))
 126 #define CMSG_LEN(len) (sizeof(struct cmsghdr) + (len))
 127
 128 #define __CMSG_FIRSTHDR(ctl,len) ((len) >= sizeof(struct cmsghdr) ? \
 129                                   (struct cmsghdr *)(ctl) : \
 130                                   (struct cmsghdr *)NULL)
 131 #define CMSG_FIRSTHDR(msg)      __CMSG_FIRSTHDR((msg)->msg_control, (msg)->msg_controllen)
 132 #define CMSG_OK(mhdr, cmsg) ((cmsg)->cmsg_len >= sizeof(struct cmsghdr) && \
 133                              (cmsg)->cmsg_len <= (unsigned long) \
 134                              ((mhdr)->msg_controllen - \
 135                               ((char *)(cmsg) - (char *)(mhdr)->msg_control)))
 136 #define for_each_cmsghdr(cmsg, msg) \
 137         for (cmsg = CMSG_FIRSTHDR(msg); \
 138              cmsg; \
 139              cmsg = CMSG_NXTHDR(msg, cmsg))
 140
 141 /*
 142  *      Get the next cmsg header
 143  *
 144  *      PLEASE, do not touch this function. If you think, that it is
 145  *      incorrect, grep kernel sources and think about consequences
 146  *      before trying to improve it.
 147  *
 148  *      Now it always returns valid, not truncated ancillary object
 149  *      HEADER. But caller still MUST check, that cmsg->cmsg_len is
 150  *      inside range, given by msg->msg_controllen before using
 151  *      ancillary object DATA.                          --ANK (980731)
 152  */
 153
 154 static inline struct cmsghdr * __cmsg_nxthdr(void *__ctl, __kernel_size_t __size,
 155                                                struct cmsghdr *__cmsg)
 156 {
 157         struct cmsghdr * __ptr;
 158
 159         __ptr = (struct cmsghdr*)(((unsigned char *) __cmsg) +  CMSG_ALIGN(__cmsg->cmsg_len));
 160         if ((unsigned long)((char*)(__ptr+1) - (char *) __ctl) > __size)
 161                 return (struct cmsghdr *)0;
 162
 163         return __ptr;
 164 }
 165
 166 static inline struct cmsghdr * cmsg_nxthdr (struct msghdr *__msg, struct cmsghdr *__cmsg)
 167 {
 168         return __cmsg_nxthdr(__msg->msg_control, __msg->msg_controllen, __cmsg);
 169 }
 170
 171 static inline size_t msg_data_left(struct msghdr *msg)
 172 {
 173         return iov_iter_count(&msg->msg_iter);
 174 }
 175
 176 /* "Socket"-level control message types: */
 177
 178 #define SCM_RIGHTS      0x01            /* rw: access rights (array of int) */
 179 #define SCM_CREDENTIALS 0x02            /* rw: struct ucred             */
 180 #define SCM_SECURITY    0x03            /* rw: security label           */
 181 #define SCM_PIDFD       0x04            /* ro: pidfd (int)              */
 182
 183 struct ucred {
 184         __u32   pid;
 185         __u32   uid;
 186         __u32   gid;
 187 };
 188
 189 /* Supported address families. */
 190 #define AF_UNSPEC       0
 191 #define AF_UNIX         1       /* Unix domain sockets          */
 192 #define AF_LOCAL        1       /* POSIX name for AF_UNIX       */
 193 #define AF_INET         2       /* Internet IP Protocol         */
 194 #define AF_AX25         3       /* Amateur Radio AX.25          */
 195 #define AF_IPX          4       /* Novell IPX                   */
 196 #define AF_APPLETALK    5       /* AppleTalk DDP                */
 197 #define AF_NETROM       6       /* Amateur Radio NET/ROM        */
 198 #define AF_BRIDGE       7       /* Multiprotocol bridge         */
 199 #define AF_ATMPVC       8       /* ATM PVCs                     */
 200 #define AF_X25          9       /* Reserved for X.25 project    */
 201 #define AF_INET6        10      /* IP version 6                 */
 202 #define AF_ROSE         11      /* Amateur Radio X.25 PLP       */
 203 #define AF_DECnet       12      /* Reserved for DECnet project  */
 204 #define AF_NETBEUI      13      /* Reserved for 802.2LLC project*/
 205 #define AF_SECURITY     14      /* Security callback pseudo AF */
 206 #define AF_KEY          15      /* PF_KEY key management API */
 207 #define AF_NETLINK      16
 208 #define AF_ROUTE        AF_NETLINK /* Alias to emulate 4.4BSD */
 209 #define AF_PACKET       17      /* Packet family                */
 210 #define AF_ASH          18      /* Ash                          */
 211 #define AF_ECONET       19      /* Acorn Econet                 */
 212 #define AF_ATMSVC       20      /* ATM SVCs                     */
 213 #define AF_RDS          21      /* RDS sockets                  */
 214 #define AF_SNA          22      /* Linux SNA Project (nutters!) */
 215 #define AF_IRDA         23      /* IRDA sockets                 */
 216 #define AF_PPPOX        24      /* PPPoX sockets                */
 217 #define AF_WANPIPE      25      /* Wanpipe API Sockets */
 218 #define AF_LLC          26      /* Linux LLC                    */
 219 #define AF_IB           27      /* Native InfiniBand address    */
 220 #define AF_MPLS         28      /* MPLS */
 221 #define AF_CAN          29      /* Controller Area Network      */
 222 #define AF_TIPC         30      /* TIPC sockets                 */
 223 #define AF_BLUETOOTH    31      /* Bluetooth sockets            */
 224 #define AF_IUCV         32      /* IUCV sockets                 */
 225 #define AF_RXRPC        33      /* RxRPC sockets                */
 226 #define AF_ISDN         34      /* mISDN sockets                */
 227 #define AF_PHONET       35      /* Phonet sockets               */
 228 #define AF_IEEE802154   36      /* IEEE802154 sockets           */
 229 #define AF_CAIF         37      /* CAIF sockets                 */
 230 #define AF_ALG          38      /* Algorithm sockets            */
 231 #define AF_NFC          39      /* NFC sockets                  */
 232 #define AF_VSOCK        40      /* vSockets                     */
 233 #define AF_KCM          41      /* Kernel Connection Multiplexor*/
 234 #define AF_QIPCRTR      42      /* Qualcomm IPC Router          */
 235 #define AF_SMC          43      /* smc sockets: reserve number for
 236                                  * PF_SMC protocol family that
 237                                  * reuses AF_INET address family
 238                                  */
 239 #define AF_XDP          44      /* XDP sockets                  */
 240 #define AF_MCTP         45      /* Management component
 241                                  * transport protocol
 242                                  */
 243
 244 #define AF_MAX          46      /* For now.. */
 245
 246 /* Protocol families, same as address families. */
 247 #define PF_UNSPEC       AF_UNSPEC
 248 #define PF_UNIX         AF_UNIX
 249 #define PF_LOCAL        AF_LOCAL
 250 #define PF_INET         AF_INET
 251 #define PF_AX25         AF_AX25
 252 #define PF_IPX          AF_IPX
 253 #define PF_APPLETALK    AF_APPLETALK
 254 #define PF_NETROM       AF_NETROM
 255 #define PF_BRIDGE       AF_BRIDGE
 256 #define PF_ATMPVC       AF_ATMPVC
 257 #define PF_X25          AF_X25
 258 #define PF_INET6        AF_INET6
 259 #define PF_ROSE         AF_ROSE
 260 #define PF_DECnet       AF_DECnet
 261 #define PF_NETBEUI      AF_NETBEUI
 262 #define PF_SECURITY     AF_SECURITY
 263 #define PF_KEY          AF_KEY
 264 #define PF_NETLINK      AF_NETLINK
 265 #define PF_ROUTE        AF_ROUTE
 266 #define PF_PACKET       AF_PACKET
 267 #define PF_ASH          AF_ASH
 268 #define PF_ECONET       AF_ECONET
 269 #define PF_ATMSVC       AF_ATMSVC
 270 #define PF_RDS          AF_RDS
 271 #define PF_SNA          AF_SNA
 272 #define PF_IRDA         AF_IRDA
 273 #define PF_PPPOX        AF_PPPOX
 274 #define PF_WANPIPE      AF_WANPIPE
 275 #define PF_LLC          AF_LLC
 276 #define PF_IB           AF_IB
 277 #define PF_MPLS         AF_MPLS
 278 #define PF_CAN          AF_CAN
 279 #define PF_TIPC         AF_TIPC
 280 #define PF_BLUETOOTH    AF_BLUETOOTH
 281 #define PF_IUCV         AF_IUCV
 282 #define PF_RXRPC        AF_RXRPC
 283 #define PF_ISDN         AF_ISDN
 284 #define PF_PHONET       AF_PHONET
 285 #define PF_IEEE802154   AF_IEEE802154
 286 #define PF_CAIF         AF_CAIF
 287 #define PF_ALG          AF_ALG
 288 #define PF_NFC          AF_NFC
 289 #define PF_VSOCK        AF_VSOCK
 290 #define PF_KCM          AF_KCM
 291 #define PF_QIPCRTR      AF_QIPCRTR
 292 #define PF_SMC          AF_SMC
 293 #define PF_XDP          AF_XDP
 294 #define PF_MCTP         AF_MCTP
 295 #define PF_MAX          AF_MAX
 296
 297 /* Maximum queue length specifiable by listen.  */
 298 #define SOMAXCONN       4096
 299
 300 /* Flags we can use with send/ and recv.
 301    Added those for 1003.1g not all are supported yet
 302  */
 303
 304 #define MSG_OOB         1
 305 #define MSG_PEEK        2
 306 #define MSG_DONTROUTE   4
 307 #define MSG_TRYHARD     4       /* Synonym for MSG_DONTROUTE for DECnet */
 308 #define MSG_CTRUNC      8
 309 #define MSG_PROBE       0x10    /* Do not send. Only probe path f.e. for MTU */
 310 #define MSG_TRUNC       0x20
 311 #define MSG_DONTWAIT    0x40    /* Nonblocking io                */
 312 #define MSG_EOR         0x80    /* End of record */
 313 #define MSG_WAITALL     0x100   /* Wait for a full request */
 314 #define MSG_FIN         0x200
 315 #define MSG_SYN         0x400
 316 #define MSG_CONFIRM     0x800   /* Confirm path validity */
 317 #define MSG_RST         0x1000
 318 #define MSG_ERRQUEUE    0x2000  /* Fetch message from error queue */
 319 #define MSG_NOSIGNAL    0x4000  /* Do not generate SIGPIPE */
 320 #define MSG_MORE        0x8000  /* Sender will send more */
 321 #define MSG_WAITFORONE  0x10000 /* recvmmsg(): block until 1+ packets avail */
 322 #define MSG_SENDPAGE_NOPOLICY 0x10000 /* sendpage() internal : do no apply policy */
 323 #define MSG_BATCH       0x40000 /* sendmmsg(): more messages coming */
 324 #define MSG_EOF         MSG_FIN
 325 #define MSG_NO_SHARED_FRAGS 0x80000 /* sendpage() internal : page frags are not shared */
 326 #define MSG_SENDPAGE_DECRYPTED  0x100000 /* sendpage() internal : page may carry
 327                                           * plain text and require encryption
 328                                           */
 329
 330 #define MSG_SOCK_DEVMEM 0x2000000       /* Receive devmem skbs as cmsg */
 331 #define MSG_ZEROCOPY    0x4000000       /* Use user data in kernel path */
 332 #define MSG_SPLICE_PAGES 0x8000000      /* Splice the pages from the iterator in sendmsg() */
 333 #define MSG_FASTOPEN    0x20000000      /* Send data in TCP SYN */
 334 #define MSG_CMSG_CLOEXEC 0x40000000     /* Set close_on_exec for file
 335                                            descriptor received through
 336                                            SCM_RIGHTS */
 337 #if defined(CONFIG_COMPAT)
 338 #define MSG_CMSG_COMPAT 0x80000000      /* This message needs 32 bit fixups */
 339 #else
 340 #define MSG_CMSG_COMPAT 0               /* We never have 32 bit fixups */
 341 #endif
 342
 343 /* Flags to be cleared on entry by sendmsg and sendmmsg syscalls */
 344 #define MSG_INTERNAL_SENDMSG_FLAGS \
 345         (MSG_SPLICE_PAGES | MSG_SENDPAGE_NOPOLICY | MSG_SENDPAGE_DECRYPTED)
 346
 347 /* Setsockoptions(2) level. Thanks to BSD these must match IPPROTO_xxx */
 348 #define SOL_IP          0
 349 /* #define SOL_ICMP     1       No-no-no! Due to Linux :-) we cannot use SOL_ICMP=1 */
 350 #define SOL_TCP         6
 351 #define SOL_UDP         17
 352 #define SOL_IPV6        41
 353 #define SOL_ICMPV6      58
 354 #define SOL_SCTP        132
 355 #define SOL_UDPLITE     136     /* UDP-Lite (RFC 3828) */
 356 #define SOL_RAW         255
 357 #define SOL_IPX         256
 358 #define SOL_AX25        257
 359 #define SOL_ATALK       258
 360 #define SOL_NETROM      259
 361 #define SOL_ROSE        260
 362 #define SOL_DECNET      261
 363 #define SOL_X25         262
 364 #define SOL_PACKET      263
 365 #define SOL_ATM         264     /* ATM layer (cell level) */
 366 #define SOL_AAL         265     /* ATM Adaption Layer (packet level) */
 367 #define SOL_IRDA        266
 368 #define SOL_NETBEUI     267
 369 #define SOL_LLC         268
 370 #define SOL_DCCP        269
 371 #define SOL_NETLINK     270
 372 #define SOL_TIPC        271
 373 #define SOL_RXRPC       272
 374 #define SOL_PPPOL2TP    273
 375 #define SOL_BLUETOOTH   274
 376 #define SOL_PNPIPE      275
 377 #define SOL_RDS         276
 378 #define SOL_IUCV        277
 379 #define SOL_CAIF        278
 380 #define SOL_ALG         279
 381 #define SOL_NFC         280
 382 #define SOL_KCM         281
 383 #define SOL_TLS         282
 384 #define SOL_XDP         283
 385 #define SOL_MPTCP       284
 386 #define SOL_MCTP        285
 387 #define SOL_SMC         286
 388 #define SOL_VSOCK       287
 389
 390 /* IPX options */
 391 #define IPX_TYPE        1
 392
 393 extern int move_addr_to_kernel(void __user *uaddr, int ulen, struct sockaddr_storage *kaddr);
 394 extern int put_cmsg(struct msghdr*, int level, int type, int len, void *data);
 395
 396 struct timespec64;
 397 struct __kernel_timespec;
 398 struct old_timespec32;
 399
 400 struct scm_timestamping_internal {
 401         struct timespec64 ts[3];
 402 };
 403
 404 extern void put_cmsg_scm_timestamping64(struct msghdr *msg, struct scm_timestamping_internal *tss);
 405 extern void put_cmsg_scm_timestamping(struct msghdr *msg, struct scm_timestamping_internal *tss);
 406
 407 /* The __sys_...msg variants allow MSG_CMSG_COMPAT iff
 408  * forbid_cmsg_compat==false
 409  */
 410 extern long __sys_recvmsg(int fd, struct user_msghdr __user *msg,
 411                           unsigned int flags, bool forbid_cmsg_compat);
 412 extern long __sys_sendmsg(int fd, struct user_msghdr __user *msg,
 413                           unsigned int flags, bool forbid_cmsg_compat);
 414 extern int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg,
 415                           unsigned int vlen, unsigned int flags,
 416                           struct __kernel_timespec __user *timeout,
 417                           struct old_timespec32 __user *timeout32);
 418 extern int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg,
 419                           unsigned int vlen, unsigned int flags,
 420                           bool forbid_cmsg_compat);
 421 extern long __sys_sendmsg_sock(struct socket *sock, struct msghdr *msg,
 422                                unsigned int flags);
 423 extern long __sys_recvmsg_sock(struct socket *sock, struct msghdr *msg,
 424                                struct user_msghdr __user *umsg,
 425                                struct sockaddr __user *uaddr,
 426                                unsigned int flags);
 427 extern int __copy_msghdr(struct msghdr *kmsg,
 428                          struct user_msghdr *umsg,
 429                          struct sockaddr __user **save_addr);
 430
 431 /* helpers which do the actual work for syscalls */
 432 extern int __sys_recvfrom(int fd, void __user *ubuf, size_t size,
 433                           unsigned int flags, struct sockaddr __user *addr,
 434                           int __user *addr_len);
 435 extern int __sys_sendto(int fd, void __user *buff, size_t len,
 436                         unsigned int flags, struct sockaddr __user *addr,
 437                         int addr_len);
 438 extern struct file *do_accept(struct file *file, struct proto_accept_arg *arg,
 439                               struct sockaddr __user *upeer_sockaddr,
 440                               int __user *upeer_addrlen, int flags);
 441 extern int __sys_accept4(int fd, struct sockaddr __user *upeer_sockaddr,
 442                          int __user *upeer_addrlen, int flags);
 443 extern int __sys_socket(int family, int type, int protocol);
 444 extern struct file *__sys_socket_file(int family, int type, int protocol);
 445 extern int __sys_bind(int fd, struct sockaddr __user *umyaddr, int addrlen);
 446 extern int __sys_bind_socket(struct socket *sock, struct sockaddr_storage *address,
 447                              int addrlen);
 448 extern int __sys_connect_file(struct file *file, struct sockaddr_storage *addr,
 449                               int addrlen, int file_flags);
 450 extern int __sys_connect(int fd, struct sockaddr __user *uservaddr,
 451                          int addrlen);
 452 extern int __sys_listen(int fd, int backlog);
 453 extern int __sys_listen_socket(struct socket *sock, int backlog);
 454 extern int __sys_getsockname(int fd, struct sockaddr __user *usockaddr,
 455                              int __user *usockaddr_len);
 456 extern int __sys_getpeername(int fd, struct sockaddr __user *usockaddr,
 457                              int __user *usockaddr_len);
 458 extern int __sys_socketpair(int family, int type, int protocol,
 459                             int __user *usockvec);
 460 extern int __sys_shutdown_sock(struct socket *sock, int how);
 461 extern int __sys_shutdown(int fd, int how);
 462 #endif /* _LINUX_SOCKET_H */