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 #ifdef HAVE_SYS_IOCCOM_H 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 32 /* This is all part of the "official" NBD API. 33 * 34 * The most up-to-date documentation is available at: 35 * https://github.com/yoe/nbd/blob/master/doc/proto.md 36 */ 37 38 /* Size of all NBD_OPT_*, without payload */ 39 #define NBD_REQUEST_SIZE (4 + 2 + 2 + 8 + 8 + 4) 40 /* Size of all NBD_REP_* sent in answer to most NBD_OPT_*, without payload */ 41 #define NBD_REPLY_SIZE (4 + 4 + 8) 42 /* Size of reply to NBD_OPT_EXPORT_NAME */ 43 #define NBD_REPLY_EXPORT_NAME_SIZE (8 + 2 + 124) 44 /* Size of oldstyle negotiation */ 45 #define NBD_OLDSTYLE_NEGOTIATE_SIZE (8 + 8 + 8 + 4 + 124) 46 47 #define NBD_INIT_MAGIC 0x4e42444d41474943LL /* ASCII "NBDMAGIC" */ 48 #define NBD_REQUEST_MAGIC 0x25609513 49 #define NBD_OPTS_MAGIC 0x49484156454F5054LL /* ASCII "IHAVEOPT" */ 50 #define NBD_CLIENT_MAGIC 0x0000420281861253LL 51 #define NBD_REP_MAGIC 0x0003e889045565a9LL 52 53 #define NBD_SET_SOCK _IO(0xab, 0) 54 #define NBD_SET_BLKSIZE _IO(0xab, 1) 55 #define NBD_SET_SIZE _IO(0xab, 2) 56 #define NBD_DO_IT _IO(0xab, 3) 57 #define NBD_CLEAR_SOCK _IO(0xab, 4) 58 #define NBD_CLEAR_QUE _IO(0xab, 5) 59 #define NBD_PRINT_DEBUG _IO(0xab, 6) 60 #define NBD_SET_SIZE_BLOCKS _IO(0xab, 7) 61 #define NBD_DISCONNECT _IO(0xab, 8) 62 #define NBD_SET_TIMEOUT _IO(0xab, 9) 63 #define NBD_SET_FLAGS _IO(0xab, 10) 64 65 /* nbd_write 66 * Writes @size bytes to @ioc. Returns 0 on success. 67 */ 68 static inline int nbd_write(QIOChannel *ioc, const void *buffer, size_t size, 69 Error **errp) 70 { 71 return qio_channel_write_all(ioc, buffer, size, errp) < 0 ? -EIO : 0; 72 } 73 74 struct NBDTLSHandshakeData { 75 GMainLoop *loop; 76 bool complete; 77 Error *error; 78 }; 79 80 81 void nbd_tls_handshake(QIOTask *task, 82 void *opaque); 83 84 int nbd_drop(QIOChannel *ioc, size_t size, Error **errp); 85 86 #endif 87