nbd/nbd-internal.h

   1 /*
   2  * NBD Internal Declarations
   3  *
   4  * Copyright (C) 2016 Red Hat, Inc.
   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/coroutine.h"
  17 #include "qemu/iov.h"
  18
  19 #ifndef _WIN32
  20 #include <sys/ioctl.h>
  21 #endif
  22 #if defined(__sun__) || defined(__HAIKU__)
  23 #include <sys/ioccom.h>
  24 #endif
  25
  26 #ifdef __linux__
  27 #include <linux/fs.h>
  28 #endif
  29
  30 #include "qemu/bswap.h"
  31 #include "qemu/queue.h"
  32 #include "qemu/main-loop.h"
  33
  34 /* This is all part of the "official" NBD API.
  35  *
  36  * The most up-to-date documentation is available at:
  37  * https://github.com/yoe/nbd/blob/master/doc/proto.md
  38  */
  39
  40 /* Size of all NBD_OPT_*, without payload */
  41 #define NBD_REQUEST_SIZE            (4 + 2 + 2 + 8 + 8 + 4)
  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_REQUEST_MAGIC           0x25609513
  51 #define NBD_OPTS_MAGIC              0x49484156454F5054LL /* ASCII "IHAVEOPT" */
  52 #define NBD_CLIENT_MAGIC            0x0000420281861253LL
  53 #define NBD_REP_MAGIC               0x0003e889045565a9LL
  54
  55 #define NBD_SET_SOCK                _IO(0xab, 0)
  56 #define NBD_SET_BLKSIZE             _IO(0xab, 1)
  57 #define NBD_SET_SIZE                _IO(0xab, 2)
  58 #define NBD_DO_IT                   _IO(0xab, 3)
  59 #define NBD_CLEAR_SOCK              _IO(0xab, 4)
  60 #define NBD_CLEAR_QUE               _IO(0xab, 5)
  61 #define NBD_PRINT_DEBUG             _IO(0xab, 6)
  62 #define NBD_SET_SIZE_BLOCKS         _IO(0xab, 7)
  63 #define NBD_DISCONNECT              _IO(0xab, 8)
  64 #define NBD_SET_TIMEOUT             _IO(0xab, 9)
  65 #define NBD_SET_FLAGS               _IO(0xab, 10)
  66
  67 /* nbd_read_eof
  68  * Tries to read @size bytes from @ioc.
  69  * Returns 1 on success
  70  *         0 on eof, when no data was read (errp is not set)
  71  *         negative errno on failure (errp is set)
  72  */
  73 static inline int nbd_read_eof(QIOChannel *ioc, void *buffer, size_t size,
  74                                Error **errp)
  75 {
  76     int ret;
  77
  78     assert(size);
  79     ret = qio_channel_read_all_eof(ioc, buffer, size, errp);
  80     if (ret < 0) {
  81         ret = -EIO;
  82     }
  83     return ret;
  84 }
  85
  86 /* nbd_write
  87  * Writes @size bytes to @ioc. Returns 0 on success.
  88  */
  89 static inline int nbd_write(QIOChannel *ioc, const void *buffer, size_t size,
  90                             Error **errp)
  91 {
  92     return qio_channel_write_all(ioc, buffer, size, errp) < 0 ? -EIO : 0;
  93 }
  94
  95 struct NBDTLSHandshakeData {
  96     GMainLoop *loop;
  97     bool complete;
  98     Error *error;
  99 };
 100
 101
 102 void nbd_tls_handshake(QIOTask *task,
 103                        void *opaque);
 104
 105 int nbd_drop(QIOChannel *ioc, size_t size, Error **errp);
 106
 107 #endif