nbd/nbd-internal.h

   1 /*
   2  * NBD Internal Declarations
   3  *
   4  * Copyright Red Hat
   5  *
   6  * This work is licensed under the terms of the GNU GPL, version 2 or later.
   7  * See the COPYING file in the top-level directory.
   8  */
   9
  10 #ifndef NBD_INTERNAL_H
  11 #define NBD_INTERNAL_H
  12 #include "block/nbd.h"
  13 #include "sysemu/block-backend.h"
  14 #include "io/channel-tls.h"
  15
  16 #include "qemu/iov.h"
  17
  18 #ifndef _WIN32
  19 #include <sys/ioctl.h>
  20 #endif
  21 #ifdef HAVE_SYS_IOCCOM_H
  22 #include <sys/ioccom.h>
  23 #endif
  24
  25 #ifdef __linux__
  26 #include <linux/fs.h>
  27 #endif
  28
  29 #include "qemu/bswap.h"
  30
  31 /* This is all part of the "official" NBD API.
  32  *
  33  * The most up-to-date documentation is available at:
  34  * https://github.com/yoe/nbd/blob/master/doc/proto.md
  35  */
  36
  37 /* Size of all compact NBD_CMD_*, without payload */
  38 #define NBD_REQUEST_SIZE            (4 + 2 + 2 + 8 + 8 + 4)
  39 /* Size of all extended NBD_CMD_*, without payload */
  40 #define NBD_EXTENDED_REQUEST_SIZE   (4 + 2 + 2 + 8 + 8 + 8)
  41
  42 /* Size of all NBD_REP_* sent in answer to most NBD_OPT_*, without payload */
  43 #define NBD_REPLY_SIZE              (4 + 4 + 8)
  44 /* Size of reply to NBD_OPT_EXPORT_NAME */
  45 #define NBD_REPLY_EXPORT_NAME_SIZE  (8 + 2 + 124)
  46 /* Size of oldstyle negotiation */
  47 #define NBD_OLDSTYLE_NEGOTIATE_SIZE (8 + 8 + 8 + 4 + 124)
  48
  49 #define NBD_INIT_MAGIC              0x4e42444d41474943LL /* ASCII "NBDMAGIC" */
  50 #define NBD_OPTS_MAGIC              0x49484156454F5054LL /* ASCII "IHAVEOPT" */
  51 #define NBD_CLIENT_MAGIC            0x0000420281861253LL
  52 #define NBD_REP_MAGIC               0x0003e889045565a9LL
  53
  54 #define NBD_SET_SOCK                _IO(0xab, 0)
  55 #define NBD_SET_BLKSIZE             _IO(0xab, 1)
  56 #define NBD_SET_SIZE                _IO(0xab, 2)
  57 #define NBD_DO_IT                   _IO(0xab, 3)
  58 #define NBD_CLEAR_SOCK              _IO(0xab, 4)
  59 #define NBD_CLEAR_QUE               _IO(0xab, 5)
  60 #define NBD_PRINT_DEBUG             _IO(0xab, 6)
  61 #define NBD_SET_SIZE_BLOCKS         _IO(0xab, 7)
  62 #define NBD_DISCONNECT              _IO(0xab, 8)
  63 #define NBD_SET_TIMEOUT             _IO(0xab, 9)
  64 #define NBD_SET_FLAGS               _IO(0xab, 10)
  65
  66 /* nbd_write
  67  * Writes @size bytes to @ioc. Returns 0 on success.
  68  */
  69 static inline int nbd_write(QIOChannel *ioc, const void *buffer, size_t size,
  70                             Error **errp)
  71 {
  72     return qio_channel_write_all(ioc, buffer, size, errp) < 0 ? -EIO : 0;
  73 }
  74
  75 struct NBDTLSHandshakeData {
  76     GMainLoop *loop;
  77     bool complete;
  78     Error *error;
  79 };
  80
  81
  82 void nbd_tls_handshake(QIOTask *task,
  83                        void *opaque);
  84
  85 int nbd_drop(QIOChannel *ioc, size_t size, Error **errp);
  86
  87 #endif