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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"
f95910fe 14#include "io/channel-tls.h"
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15
16#include "qemu/coroutine.h"
1c778ef7 17#include "qemu/iov.h"
798bfe00 18
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19#ifndef _WIN32
20#include <sys/ioctl.h>
21#endif
22#if defined(__sun__) || defined(__HAIKU__)
23#include <sys/ioccom.h>
24#endif
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25
26#ifdef __linux__
27#include <linux/fs.h>
28#endif
29
58369e22 30#include "qemu/bswap.h"
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31#include "qemu/queue.h"
32#include "qemu/main-loop.h"
33
34/* #define DEBUG_NBD */
35
36#ifdef DEBUG_NBD
8c659712 37#define DEBUG_NBD_PRINT 1
798bfe00 38#else
8c659712 39#define DEBUG_NBD_PRINT 0
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40#endif
41
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42#define TRACE(msg, ...) do { \
43 if (DEBUG_NBD_PRINT) { \
44 LOG(msg, ## __VA_ARGS__); \
45 } \
46} while (0)
47
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48#define LOG(msg, ...) do { \
49 fprintf(stderr, "%s:%s():L%d: " msg "\n", \
50 __FILE__, __FUNCTION__, __LINE__, ## __VA_ARGS__); \
8c659712 51} while (0)
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52
53/* This is all part of the "official" NBD API.
54 *
55 * The most up-to-date documentation is available at:
b626b51a 56 * https://github.com/yoe/nbd/blob/master/doc/proto.md
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57 */
58
b626b51a 59#define NBD_REQUEST_SIZE (4 + 2 + 2 + 8 + 8 + 4)
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60#define NBD_REPLY_SIZE (4 + 4 + 8)
61#define NBD_REQUEST_MAGIC 0x25609513
62#define NBD_REPLY_MAGIC 0x67446698
63#define NBD_OPTS_MAGIC 0x49484156454F5054LL
64#define NBD_CLIENT_MAGIC 0x0000420281861253LL
c8a3a1b6 65#define NBD_REP_MAGIC 0x0003e889045565a9LL
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66
67#define NBD_SET_SOCK _IO(0xab, 0)
68#define NBD_SET_BLKSIZE _IO(0xab, 1)
69#define NBD_SET_SIZE _IO(0xab, 2)
70#define NBD_DO_IT _IO(0xab, 3)
71#define NBD_CLEAR_SOCK _IO(0xab, 4)
72#define NBD_CLEAR_QUE _IO(0xab, 5)
73#define NBD_PRINT_DEBUG _IO(0xab, 6)
74#define NBD_SET_SIZE_BLOCKS _IO(0xab, 7)
75#define NBD_DISCONNECT _IO(0xab, 8)
76#define NBD_SET_TIMEOUT _IO(0xab, 9)
77#define NBD_SET_FLAGS _IO(0xab, 10)
78
79#define NBD_OPT_EXPORT_NAME (1)
80#define NBD_OPT_ABORT (2)
81#define NBD_OPT_LIST (3)
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82#define NBD_OPT_PEEK_EXPORT (4)
83#define NBD_OPT_STARTTLS (5)
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84
85/* NBD errors are based on errno numbers, so there is a 1:1 mapping,
86 * but only a limited set of errno values is specified in the protocol.
87 * Everything else is squashed to EINVAL.
88 */
89#define NBD_SUCCESS 0
90#define NBD_EPERM 1
91#define NBD_EIO 5
92#define NBD_ENOMEM 12
93#define NBD_EINVAL 22
94#define NBD_ENOSPC 28
b6f5d3b5 95#define NBD_ESHUTDOWN 108
798bfe00 96
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97/* read_sync_eof
98 * Tries to read @size bytes from @ioc. Returns number of bytes actually read.
99 * May return a value >= 0 and < size only on EOF, i.e. when iteratively called
100 * qio_channel_readv() returns 0. So, there are no needs to call read_sync_eof
101 * iteratively.
102 */
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103static inline ssize_t read_sync_eof(QIOChannel *ioc, void *buffer, size_t size,
104 Error **errp)
798bfe00 105{
1c778ef7 106 struct iovec iov = { .iov_base = buffer, .iov_len = size };
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107 /* Sockets are kept in blocking mode in the negotiation phase. After
108 * that, a non-readable socket simply means that another thread stole
109 * our request/reply. Synchronization is done with recv_coroutine, so
110 * that this is coroutine-safe.
111 */
e44ed99d 112 return nbd_wr_syncv(ioc, &iov, 1, size, true, errp);
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113}
114
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115/* read_sync
116 * Reads @size bytes from @ioc. Returns 0 on success.
117 */
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118static inline int read_sync(QIOChannel *ioc, void *buffer, size_t size,
119 Error **errp)
f5d406fe 120{
e44ed99d 121 ssize_t ret = read_sync_eof(ioc, buffer, size, errp);
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122
123 if (ret >= 0 && ret != size) {
124 ret = -EINVAL;
e44ed99d 125 error_setg(errp, "End of file");
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126 }
127
128 return ret < 0 ? ret : 0;
129}
130
131/* write_sync
132 * Writes @size bytes to @ioc. Returns 0 on success.
133 */
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134static inline int write_sync(QIOChannel *ioc, const void *buffer, size_t size,
135 Error **errp)
798bfe00 136{
b1a75b33 137 struct iovec iov = { .iov_base = (void *) buffer, .iov_len = size };
1c778ef7 138
e44ed99d 139 ssize_t ret = nbd_wr_syncv(ioc, &iov, 1, size, false, errp);
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140
141 assert(ret < 0 || ret == size);
142
143 return ret < 0 ? ret : 0;
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144}
145
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146struct NBDTLSHandshakeData {
147 GMainLoop *loop;
148 bool complete;
149 Error *error;
150};
151
152
60e705c5 153void nbd_tls_handshake(QIOTask *task,
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154 void *opaque);
155
798bfe00 156#endif