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c8720ca03e
Although extended mode is not yet enabled, once we do turn it on, we need to accept extended requests for all messages. Previous patches have already taken care of supporting 64-bit lengths, now we just need to read it off the wire. Note that this implementation will block indefinitely on a buggy client that sends a non-extended payload (that is, we try to read a full packet before we ever check the magic number, but a client that mistakenly sends a simple request after negotiating extended headers doesn't send us enough bytes), but it's no different from any other client that stops talking to us partway through a packet and thus not worth coding around. Signed-off-by: Eric Blake <eblake@redhat.com> Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru> Message-ID: <20230925192229.3186470-16-eblake@redhat.com>
88 lines
2.5 KiB
C
88 lines
2.5 KiB
C
/*
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* NBD Internal Declarations
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*
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* Copyright Red Hat
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*/
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#ifndef NBD_INTERNAL_H
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#define NBD_INTERNAL_H
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#include "block/nbd.h"
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#include "sysemu/block-backend.h"
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#include "io/channel-tls.h"
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#include "qemu/iov.h"
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#ifndef _WIN32
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#include <sys/ioctl.h>
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#endif
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#ifdef HAVE_SYS_IOCCOM_H
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#include <sys/ioccom.h>
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#endif
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#ifdef __linux__
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#include <linux/fs.h>
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#endif
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#include "qemu/bswap.h"
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/* This is all part of the "official" NBD API.
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*
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* The most up-to-date documentation is available at:
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* https://github.com/yoe/nbd/blob/master/doc/proto.md
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*/
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/* Size of all compact NBD_CMD_*, without payload */
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#define NBD_REQUEST_SIZE (4 + 2 + 2 + 8 + 8 + 4)
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/* Size of all extended NBD_CMD_*, without payload */
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#define NBD_EXTENDED_REQUEST_SIZE (4 + 2 + 2 + 8 + 8 + 8)
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/* Size of all NBD_REP_* sent in answer to most NBD_OPT_*, without payload */
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#define NBD_REPLY_SIZE (4 + 4 + 8)
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/* Size of reply to NBD_OPT_EXPORT_NAME */
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#define NBD_REPLY_EXPORT_NAME_SIZE (8 + 2 + 124)
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/* Size of oldstyle negotiation */
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#define NBD_OLDSTYLE_NEGOTIATE_SIZE (8 + 8 + 8 + 4 + 124)
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#define NBD_INIT_MAGIC 0x4e42444d41474943LL /* ASCII "NBDMAGIC" */
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#define NBD_OPTS_MAGIC 0x49484156454F5054LL /* ASCII "IHAVEOPT" */
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#define NBD_CLIENT_MAGIC 0x0000420281861253LL
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#define NBD_REP_MAGIC 0x0003e889045565a9LL
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#define NBD_SET_SOCK _IO(0xab, 0)
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#define NBD_SET_BLKSIZE _IO(0xab, 1)
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#define NBD_SET_SIZE _IO(0xab, 2)
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#define NBD_DO_IT _IO(0xab, 3)
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#define NBD_CLEAR_SOCK _IO(0xab, 4)
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#define NBD_CLEAR_QUE _IO(0xab, 5)
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#define NBD_PRINT_DEBUG _IO(0xab, 6)
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#define NBD_SET_SIZE_BLOCKS _IO(0xab, 7)
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#define NBD_DISCONNECT _IO(0xab, 8)
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#define NBD_SET_TIMEOUT _IO(0xab, 9)
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#define NBD_SET_FLAGS _IO(0xab, 10)
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/* nbd_write
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* Writes @size bytes to @ioc. Returns 0 on success.
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*/
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static inline int nbd_write(QIOChannel *ioc, const void *buffer, size_t size,
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Error **errp)
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{
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return qio_channel_write_all(ioc, buffer, size, errp) < 0 ? -EIO : 0;
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}
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struct NBDTLSHandshakeData {
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GMainLoop *loop;
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bool complete;
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Error *error;
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};
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void nbd_tls_handshake(QIOTask *task,
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void *opaque);
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int nbd_drop(QIOChannel *ioc, size_t size, Error **errp);
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#endif
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