include/linux/socket.h

   1 #ifndef _LINUX_SOCKET_H
   2 #define _LINUX_SOCKET_H
   3
   4
   5 #include <asm/socket.h>                 /* arch-dependent defines       */
   6 #include <linux/sockios.h>              /* the SIOCxxx I/O controls     */
   7 #include <linux/uio.h>                  /* iovec support                */
   8 #include <linux/types.h>                /* pid_t                        */
   9 #include <linux/compiler.h>             /* __user                       */
  10 #include <uapi/linux/socket.h>
  11
  12 struct pid;
  13 struct cred;
  14
  15 #define __sockaddr_check_size(size)     \
  16         BUILD_BUG_ON(((size) > sizeof(struct __kernel_sockaddr_storage)))
  17
  18 #ifdef CONFIG_PROC_FS
  19 struct seq_file;
  20 extern void socket_seq_show(struct seq_file *seq);
  21 #endif
  22
  23 typedef __kernel_sa_family_t    sa_family_t;
  24
  25 /*
  26  *      1003.1g requires sa_family_t and that sa_data is char.
  27  */
  28
  29 struct sockaddr {
  30         sa_family_t     sa_family;      /* address family, AF_xxx       */
  31         char            sa_data[14];    /* 14 bytes of protocol address */
  32 };
  33
  34 struct linger {
  35         int             l_onoff;        /* Linger active                */
  36         int             l_linger;       /* How long to linger for       */
  37 };
  38
  39 #define sockaddr_storage __kernel_sockaddr_storage
  40
  41 /*
  42  *      As we do 4.4BSD message passing we use a 4.4BSD message passing
  43  *      system, not 4.3. Thus msg_accrights(len) are now missing. They
  44  *      belong in an obscure libc emulation or the bin.
  45  */
  46
  47 struct msghdr {
  48         void            *msg_name;      /* ptr to socket address structure */
  49         int             msg_namelen;    /* size of socket address structure */
  50         struct iov_iter msg_iter;       /* data */
  51         void            *msg_control;   /* ancillary data */
  52         __kernel_size_t msg_controllen; /* ancillary data buffer length */
  53         unsigned int    msg_flags;      /* flags on received message */
  54         struct kiocb    *msg_iocb;      /* ptr to iocb for async requests */
  55 };
  56
  57 struct user_msghdr {
  58         void            __user *msg_name;       /* ptr to socket address structure */
  59         int             msg_namelen;            /* size of socket address structure */
  60         struct iovec    __user *msg_iov;        /* scatter/gather array */
  61         __kernel_size_t msg_iovlen;             /* # elements in msg_iov */
  62         void            __user *msg_control;    /* ancillary data */
  63         __kernel_size_t msg_controllen;         /* ancillary data buffer length */
  64         unsigned int    msg_flags;              /* flags on received message */
  65 };
  66
  67 /* For recvmmsg/sendmmsg */
  68 struct mmsghdr {
  69         struct user_msghdr  msg_hdr;
  70         unsigned int        msg_len;
  71 };
  72
  73 /*
  74  *      POSIX 1003.1g - ancillary data object information
  75  *      Ancillary data consits of a sequence of pairs of
  76  *      (cmsghdr, cmsg_data[])
  77  */
  78
  79 struct cmsghdr {
  80         __kernel_size_t cmsg_len;       /* data byte count, including hdr */
  81         int             cmsg_level;     /* originating protocol */
  82         int             cmsg_type;      /* protocol-specific type */
  83 };
  84
  85 /*
  86  *      Ancillary data object information MACROS
  87  *      Table 5-14 of POSIX 1003.1g
  88  */
  89
  90 #define __CMSG_NXTHDR(ctl, len, cmsg) __cmsg_nxthdr((ctl),(len),(cmsg))
  91 #define CMSG_NXTHDR(mhdr, cmsg) cmsg_nxthdr((mhdr), (cmsg))
  92
  93 #define CMSG_ALIGN(len) ( ((len)+sizeof(long)-1) & ~(sizeof(long)-1) )
  94
  95 #define CMSG_DATA(cmsg) ((void *)((char *)(cmsg) + CMSG_ALIGN(sizeof(struct cmsghdr))))
  96 #define CMSG_SPACE(len) (CMSG_ALIGN(sizeof(struct cmsghdr)) + CMSG_ALIGN(len))
  97 #define CMSG_LEN(len) (CMSG_ALIGN(sizeof(struct cmsghdr)) + (len))
  98
  99 #define __CMSG_FIRSTHDR(ctl,len) ((len) >= sizeof(struct cmsghdr) ? \
 100                                   (struct cmsghdr *)(ctl) : \
 101                                   (struct cmsghdr *)NULL)
 102 #define CMSG_FIRSTHDR(msg)      __CMSG_FIRSTHDR((msg)->msg_control, (msg)->msg_controllen)
 103 #define CMSG_OK(mhdr, cmsg) ((cmsg)->cmsg_len >= sizeof(struct cmsghdr) && \
 104                              (cmsg)->cmsg_len <= (unsigned long) \
 105                              ((mhdr)->msg_controllen - \
 106                               ((char *)(cmsg) - (char *)(mhdr)->msg_control)))
 107 #define for_each_cmsghdr(cmsg, msg) \
 108         for (cmsg = CMSG_FIRSTHDR(msg); \
 109              cmsg; \
 110              cmsg = CMSG_NXTHDR(msg, cmsg))
 111
 112 /*
 113  *      Get the next cmsg header
 114  *
 115  *      PLEASE, do not touch this function. If you think, that it is
 116  *      incorrect, grep kernel sources and think about consequences
 117  *      before trying to improve it.
 118  *
 119  *      Now it always returns valid, not truncated ancillary object
 120  *      HEADER. But caller still MUST check, that cmsg->cmsg_len is
 121  *      inside range, given by msg->msg_controllen before using
 122  *      ancillary object DATA.                          --ANK (980731)
 123  */
 124
 125 static inline struct cmsghdr * __cmsg_nxthdr(void *__ctl, __kernel_size_t __size,
 126                                                struct cmsghdr *__cmsg)
 127 {
 128         struct cmsghdr * __ptr;
 129
 130         __ptr = (struct cmsghdr*)(((unsigned char *) __cmsg) +  CMSG_ALIGN(__cmsg->cmsg_len));
 131         if ((unsigned long)((char*)(__ptr+1) - (char *) __ctl) > __size)
 132                 return (struct cmsghdr *)0;
 133
 134         return __ptr;
 135 }
 136
 137 static inline struct cmsghdr * cmsg_nxthdr (struct msghdr *__msg, struct cmsghdr *__cmsg)
 138 {
 139         return __cmsg_nxthdr(__msg->msg_control, __msg->msg_controllen, __cmsg);
 140 }
 141
 142 static inline size_t msg_data_left(struct msghdr *msg)
 143 {
 144         return iov_iter_count(&msg->msg_iter);
 145 }
 146
 147 /* "Socket"-level control message types: */
 148
 149 #define SCM_RIGHTS      0x01            /* rw: access rights (array of int) */
 150 #define SCM_CREDENTIALS 0x02            /* rw: struct ucred             */
 151 #define SCM_SECURITY    0x03            /* rw: security label           */
 152
 153 struct ucred {
 154         __u32   pid;
 155         __u32   uid;
 156         __u32   gid;
 157 };
 158
 159 /* Supported address families. */
 160 #define AF_UNSPEC       0
 161 #define AF_UNIX         1       /* Unix domain sockets          */
 162 #define AF_LOCAL        1       /* POSIX name for AF_UNIX       */
 163 #define AF_INET         2       /* Internet IP Protocol         */
 164 #define AF_AX25         3       /* Amateur Radio AX.25          */
 165 #define AF_IPX          4       /* Novell IPX                   */
 166 #define AF_APPLETALK    5       /* AppleTalk DDP                */
 167 #define AF_NETROM       6       /* Amateur Radio NET/ROM        */
 168 #define AF_BRIDGE       7       /* Multiprotocol bridge         */
 169 #define AF_ATMPVC       8       /* ATM PVCs                     */
 170 #define AF_X25          9       /* Reserved for X.25 project    */
 171 #define AF_INET6        10      /* IP version 6                 */
 172 #define AF_ROSE         11      /* Amateur Radio X.25 PLP       */
 173 #define AF_DECnet       12      /* Reserved for DECnet project  */
 174 #define AF_NETBEUI      13      /* Reserved for 802.2LLC project*/
 175 #define AF_SECURITY     14      /* Security callback pseudo AF */
 176 #define AF_KEY          15      /* PF_KEY key management API */
 177 #define AF_NETLINK      16
 178 #define AF_ROUTE        AF_NETLINK /* Alias to emulate 4.4BSD */
 179 #define AF_PACKET       17      /* Packet family                */
 180 #define AF_ASH          18      /* Ash                          */
 181 #define AF_ECONET       19      /* Acorn Econet                 */
 182 #define AF_ATMSVC       20      /* ATM SVCs                     */
 183 #define AF_RDS          21      /* RDS sockets                  */
 184 #define AF_SNA          22      /* Linux SNA Project (nutters!) */
 185 #define AF_IRDA         23      /* IRDA sockets                 */
 186 #define AF_PPPOX        24      /* PPPoX sockets                */
 187 #define AF_WANPIPE      25      /* Wanpipe API Sockets */
 188 #define AF_LLC          26      /* Linux LLC                    */
 189 #define AF_IB           27      /* Native InfiniBand address    */
 190 #define AF_MPLS         28      /* MPLS */
 191 #define AF_CAN          29      /* Controller Area Network      */
 192 #define AF_TIPC         30      /* TIPC sockets                 */
 193 #define AF_BLUETOOTH    31      /* Bluetooth sockets            */
 194 #define AF_IUCV         32      /* IUCV sockets                 */
 195 #define AF_RXRPC        33      /* RxRPC sockets                */
 196 #define AF_ISDN         34      /* mISDN sockets                */
 197 #define AF_PHONET       35      /* Phonet sockets               */
 198 #define AF_IEEE802154   36      /* IEEE802154 sockets           */
 199 #define AF_CAIF         37      /* CAIF sockets                 */
 200 #define AF_ALG          38      /* Algorithm sockets            */
 201 #define AF_NFC          39      /* NFC sockets                  */
 202 #define AF_VSOCK        40      /* vSockets                     */
 203 #define AF_KCM          41      /* Kernel Connection Multiplexor*/
 204 #define AF_QIPCRTR      42      /* Qualcomm IPC Router          */
 205
 206 #define AF_MAX          43      /* For now.. */
 207
 208 /* Protocol families, same as address families. */
 209 #define PF_UNSPEC       AF_UNSPEC
 210 #define PF_UNIX         AF_UNIX
 211 #define PF_LOCAL        AF_LOCAL
 212 #define PF_INET         AF_INET
 213 #define PF_AX25         AF_AX25
 214 #define PF_IPX          AF_IPX
 215 #define PF_APPLETALK    AF_APPLETALK
 216 #define PF_NETROM       AF_NETROM
 217 #define PF_BRIDGE       AF_BRIDGE
 218 #define PF_ATMPVC       AF_ATMPVC
 219 #define PF_X25          AF_X25
 220 #define PF_INET6        AF_INET6
 221 #define PF_ROSE         AF_ROSE
 222 #define PF_DECnet       AF_DECnet
 223 #define PF_NETBEUI      AF_NETBEUI
 224 #define PF_SECURITY     AF_SECURITY
 225 #define PF_KEY          AF_KEY
 226 #define PF_NETLINK      AF_NETLINK
 227 #define PF_ROUTE        AF_ROUTE
 228 #define PF_PACKET       AF_PACKET
 229 #define PF_ASH          AF_ASH
 230 #define PF_ECONET       AF_ECONET
 231 #define PF_ATMSVC       AF_ATMSVC
 232 #define PF_RDS          AF_RDS
 233 #define PF_SNA          AF_SNA
 234 #define PF_IRDA         AF_IRDA
 235 #define PF_PPPOX        AF_PPPOX
 236 #define PF_WANPIPE      AF_WANPIPE
 237 #define PF_LLC          AF_LLC
 238 #define PF_IB           AF_IB
 239 #define PF_MPLS         AF_MPLS
 240 #define PF_CAN          AF_CAN
 241 #define PF_TIPC         AF_TIPC
 242 #define PF_BLUETOOTH    AF_BLUETOOTH
 243 #define PF_IUCV         AF_IUCV
 244 #define PF_RXRPC        AF_RXRPC
 245 #define PF_ISDN         AF_ISDN
 246 #define PF_PHONET       AF_PHONET
 247 #define PF_IEEE802154   AF_IEEE802154
 248 #define PF_CAIF         AF_CAIF
 249 #define PF_ALG          AF_ALG
 250 #define PF_NFC          AF_NFC
 251 #define PF_VSOCK        AF_VSOCK
 252 #define PF_KCM          AF_KCM
 253 #define PF_QIPCRTR      AF_QIPCRTR
 254 #define PF_MAX          AF_MAX
 255
 256 /* Maximum queue length specifiable by listen.  */
 257 #define SOMAXCONN       128
 258
 259 /* Flags we can use with send/ and recv.
 260    Added those for 1003.1g not all are supported yet
 261  */
 262
 263 #define MSG_OOB         1
 264 #define MSG_PEEK        2
 265 #define MSG_DONTROUTE   4
 266 #define MSG_TRYHARD     4       /* Synonym for MSG_DONTROUTE for DECnet */
 267 #define MSG_CTRUNC      8
 268 #define MSG_PROBE       0x10    /* Do not send. Only probe path f.e. for MTU */
 269 #define MSG_TRUNC       0x20
 270 #define MSG_DONTWAIT    0x40    /* Nonblocking io                */
 271 #define MSG_EOR         0x80    /* End of record */
 272 #define MSG_WAITALL     0x100   /* Wait for a full request */
 273 #define MSG_FIN         0x200
 274 #define MSG_SYN         0x400
 275 #define MSG_CONFIRM     0x800   /* Confirm path validity */
 276 #define MSG_RST         0x1000
 277 #define MSG_ERRQUEUE    0x2000  /* Fetch message from error queue */
 278 #define MSG_NOSIGNAL    0x4000  /* Do not generate SIGPIPE */
 279 #define MSG_MORE        0x8000  /* Sender will send more */
 280 #define MSG_WAITFORONE  0x10000 /* recvmmsg(): block until 1+ packets avail */
 281 #define MSG_SENDPAGE_NOTLAST 0x20000 /* sendpage() internal : not the last page */
 282 #define MSG_BATCH       0x40000 /* sendmmsg(): more messages coming */
 283 #define MSG_EOF         MSG_FIN
 284
 285 #define MSG_FASTOPEN    0x20000000      /* Send data in TCP SYN */
 286 #define MSG_CMSG_CLOEXEC 0x40000000     /* Set close_on_exec for file
 287                                            descriptor received through
 288                                            SCM_RIGHTS */
 289 #if defined(CONFIG_COMPAT)
 290 #define MSG_CMSG_COMPAT 0x80000000      /* This message needs 32 bit fixups */
 291 #else
 292 #define MSG_CMSG_COMPAT 0               /* We never have 32 bit fixups */
 293 #endif
 294
 295
 296 /* Setsockoptions(2) level. Thanks to BSD these must match IPPROTO_xxx */
 297 #define SOL_IP          0
 298 /* #define SOL_ICMP     1       No-no-no! Due to Linux :-) we cannot use SOL_ICMP=1 */
 299 #define SOL_TCP         6
 300 #define SOL_UDP         17
 301 #define SOL_IPV6        41
 302 #define SOL_ICMPV6      58
 303 #define SOL_SCTP        132
 304 #define SOL_UDPLITE     136     /* UDP-Lite (RFC 3828) */
 305 #define SOL_RAW         255
 306 #define SOL_IPX         256
 307 #define SOL_AX25        257
 308 #define SOL_ATALK       258
 309 #define SOL_NETROM      259
 310 #define SOL_ROSE        260
 311 #define SOL_DECNET      261
 312 #define SOL_X25         262
 313 #define SOL_PACKET      263
 314 #define SOL_ATM         264     /* ATM layer (cell level) */
 315 #define SOL_AAL         265     /* ATM Adaption Layer (packet level) */
 316 #define SOL_IRDA        266
 317 #define SOL_NETBEUI     267
 318 #define SOL_LLC         268
 319 #define SOL_DCCP        269
 320 #define SOL_NETLINK     270
 321 #define SOL_TIPC        271
 322 #define SOL_RXRPC       272
 323 #define SOL_PPPOL2TP    273
 324 #define SOL_BLUETOOTH   274
 325 #define SOL_PNPIPE      275
 326 #define SOL_RDS         276
 327 #define SOL_IUCV        277
 328 #define SOL_CAIF        278
 329 #define SOL_ALG         279
 330 #define SOL_NFC         280
 331 #define SOL_KCM         281
 332
 333 /* IPX options */
 334 #define IPX_TYPE        1
 335
 336 extern int move_addr_to_kernel(void __user *uaddr, int ulen, struct sockaddr_storage *kaddr);
 337 extern int put_cmsg(struct msghdr*, int level, int type, int len, void *data);
 338
 339 struct timespec;
 340
 341 /* The __sys_...msg variants allow MSG_CMSG_COMPAT */
 342 extern long __sys_recvmsg(int fd, struct user_msghdr __user *msg, unsigned flags);
 343 extern long __sys_sendmsg(int fd, struct user_msghdr __user *msg, unsigned flags);
 344 extern int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
 345                           unsigned int flags, struct timespec *timeout);
 346 extern int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg,
 347                           unsigned int vlen, unsigned int flags);
 348 #endif /* _LINUX_SOCKET_H */