262 lines
6.6 KiB
C
262 lines
6.6 KiB
C
/*
|
|
* Serving QEMU block devices via NBD
|
|
*
|
|
* Copyright (c) 2012 Red Hat, Inc.
|
|
*
|
|
* Author: Paolo Bonzini <pbonzini@redhat.com>
|
|
*
|
|
* This work is licensed under the terms of the GNU GPL, version 2 or
|
|
* later. See the COPYING file in the top-level directory.
|
|
*/
|
|
|
|
#include "qemu/osdep.h"
|
|
#include "sysemu/blockdev.h"
|
|
#include "sysemu/block-backend.h"
|
|
#include "hw/block/block.h"
|
|
#include "qapi/error.h"
|
|
#include "qapi/qapi-commands-block.h"
|
|
#include "block/nbd.h"
|
|
#include "io/channel-socket.h"
|
|
#include "io/net-listener.h"
|
|
|
|
typedef struct NBDServerData {
|
|
QIONetListener *listener;
|
|
QCryptoTLSCreds *tlscreds;
|
|
char *tlsauthz;
|
|
} NBDServerData;
|
|
|
|
static NBDServerData *nbd_server;
|
|
|
|
static void nbd_blockdev_client_closed(NBDClient *client, bool ignored)
|
|
{
|
|
nbd_client_put(client);
|
|
}
|
|
|
|
static void nbd_accept(QIONetListener *listener, QIOChannelSocket *cioc,
|
|
gpointer opaque)
|
|
{
|
|
qio_channel_set_name(QIO_CHANNEL(cioc), "nbd-server");
|
|
nbd_client_new(cioc, nbd_server->tlscreds, nbd_server->tlsauthz,
|
|
nbd_blockdev_client_closed);
|
|
}
|
|
|
|
|
|
static void nbd_server_free(NBDServerData *server)
|
|
{
|
|
if (!server) {
|
|
return;
|
|
}
|
|
|
|
qio_net_listener_disconnect(server->listener);
|
|
object_unref(OBJECT(server->listener));
|
|
if (server->tlscreds) {
|
|
object_unref(OBJECT(server->tlscreds));
|
|
}
|
|
g_free(server->tlsauthz);
|
|
|
|
g_free(server);
|
|
}
|
|
|
|
static QCryptoTLSCreds *nbd_get_tls_creds(const char *id, Error **errp)
|
|
{
|
|
Object *obj;
|
|
QCryptoTLSCreds *creds;
|
|
|
|
obj = object_resolve_path_component(
|
|
object_get_objects_root(), id);
|
|
if (!obj) {
|
|
error_setg(errp, "No TLS credentials with id '%s'",
|
|
id);
|
|
return NULL;
|
|
}
|
|
creds = (QCryptoTLSCreds *)
|
|
object_dynamic_cast(obj, TYPE_QCRYPTO_TLS_CREDS);
|
|
if (!creds) {
|
|
error_setg(errp, "Object with id '%s' is not TLS credentials",
|
|
id);
|
|
return NULL;
|
|
}
|
|
|
|
if (creds->endpoint != QCRYPTO_TLS_CREDS_ENDPOINT_SERVER) {
|
|
error_setg(errp,
|
|
"Expecting TLS credentials with a server endpoint");
|
|
return NULL;
|
|
}
|
|
object_ref(obj);
|
|
return creds;
|
|
}
|
|
|
|
|
|
void nbd_server_start(SocketAddress *addr, const char *tls_creds,
|
|
const char *tls_authz, Error **errp)
|
|
{
|
|
if (nbd_server) {
|
|
error_setg(errp, "NBD server already running");
|
|
return;
|
|
}
|
|
|
|
nbd_server = g_new0(NBDServerData, 1);
|
|
nbd_server->listener = qio_net_listener_new();
|
|
|
|
qio_net_listener_set_name(nbd_server->listener,
|
|
"nbd-listener");
|
|
|
|
if (qio_net_listener_open_sync(nbd_server->listener, addr, 1, errp) < 0) {
|
|
goto error;
|
|
}
|
|
|
|
if (tls_creds) {
|
|
nbd_server->tlscreds = nbd_get_tls_creds(tls_creds, errp);
|
|
if (!nbd_server->tlscreds) {
|
|
goto error;
|
|
}
|
|
|
|
/* TODO SOCKET_ADDRESS_TYPE_FD where fd has AF_INET or AF_INET6 */
|
|
if (addr->type != SOCKET_ADDRESS_TYPE_INET) {
|
|
error_setg(errp, "TLS is only supported with IPv4/IPv6");
|
|
goto error;
|
|
}
|
|
}
|
|
|
|
nbd_server->tlsauthz = g_strdup(tls_authz);
|
|
|
|
qio_net_listener_set_client_func(nbd_server->listener,
|
|
nbd_accept,
|
|
NULL,
|
|
NULL);
|
|
|
|
return;
|
|
|
|
error:
|
|
nbd_server_free(nbd_server);
|
|
nbd_server = NULL;
|
|
}
|
|
|
|
void nbd_server_start_options(NbdServerOptions *arg, Error **errp)
|
|
{
|
|
nbd_server_start(arg->addr, arg->tls_creds, arg->tls_authz, errp);
|
|
}
|
|
|
|
void qmp_nbd_server_start(SocketAddressLegacy *addr,
|
|
bool has_tls_creds, const char *tls_creds,
|
|
bool has_tls_authz, const char *tls_authz,
|
|
Error **errp)
|
|
{
|
|
SocketAddress *addr_flat = socket_address_flatten(addr);
|
|
|
|
nbd_server_start(addr_flat, tls_creds, tls_authz, errp);
|
|
qapi_free_SocketAddress(addr_flat);
|
|
}
|
|
|
|
void qmp_nbd_server_add(BlockExportNbd *arg, Error **errp)
|
|
{
|
|
BlockDriverState *bs = NULL;
|
|
BlockBackend *on_eject_blk;
|
|
NBDExport *exp;
|
|
int64_t len;
|
|
AioContext *aio_context;
|
|
|
|
if (!nbd_server) {
|
|
error_setg(errp, "NBD server not running");
|
|
return;
|
|
}
|
|
|
|
if (!arg->has_name) {
|
|
arg->name = arg->device;
|
|
}
|
|
|
|
if (strlen(arg->name) > NBD_MAX_STRING_SIZE) {
|
|
error_setg(errp, "export name '%s' too long", arg->name);
|
|
return;
|
|
}
|
|
|
|
if (arg->description && strlen(arg->description) > NBD_MAX_STRING_SIZE) {
|
|
error_setg(errp, "description '%s' too long", arg->description);
|
|
return;
|
|
}
|
|
|
|
if (nbd_export_find(arg->name)) {
|
|
error_setg(errp, "NBD server already has export named '%s'", arg->name);
|
|
return;
|
|
}
|
|
|
|
on_eject_blk = blk_by_name(arg->device);
|
|
|
|
bs = bdrv_lookup_bs(arg->device, arg->device, errp);
|
|
if (!bs) {
|
|
return;
|
|
}
|
|
|
|
aio_context = bdrv_get_aio_context(bs);
|
|
aio_context_acquire(aio_context);
|
|
len = bdrv_getlength(bs);
|
|
if (len < 0) {
|
|
error_setg_errno(errp, -len,
|
|
"Failed to determine the NBD export's length");
|
|
goto out;
|
|
}
|
|
|
|
if (!arg->has_writable) {
|
|
arg->writable = false;
|
|
}
|
|
if (bdrv_is_read_only(bs)) {
|
|
arg->writable = false;
|
|
}
|
|
|
|
exp = nbd_export_new(bs, 0, len, arg->name, arg->description, arg->bitmap,
|
|
!arg->writable, !arg->writable,
|
|
NULL, false, on_eject_blk, errp);
|
|
if (!exp) {
|
|
goto out;
|
|
}
|
|
|
|
/* The list of named exports has a strong reference to this export now and
|
|
* our only way of accessing it is through nbd_export_find(), so we can drop
|
|
* the strong reference that is @exp. */
|
|
nbd_export_put(exp);
|
|
|
|
out:
|
|
aio_context_release(aio_context);
|
|
}
|
|
|
|
void qmp_nbd_server_remove(const char *name,
|
|
bool has_mode, NbdServerRemoveMode mode,
|
|
Error **errp)
|
|
{
|
|
NBDExport *exp;
|
|
AioContext *aio_context;
|
|
|
|
if (!nbd_server) {
|
|
error_setg(errp, "NBD server not running");
|
|
return;
|
|
}
|
|
|
|
exp = nbd_export_find(name);
|
|
if (exp == NULL) {
|
|
error_setg(errp, "Export '%s' is not found", name);
|
|
return;
|
|
}
|
|
|
|
if (!has_mode) {
|
|
mode = NBD_SERVER_REMOVE_MODE_SAFE;
|
|
}
|
|
|
|
aio_context = nbd_export_aio_context(exp);
|
|
aio_context_acquire(aio_context);
|
|
nbd_export_remove(exp, mode, errp);
|
|
aio_context_release(aio_context);
|
|
}
|
|
|
|
void qmp_nbd_server_stop(Error **errp)
|
|
{
|
|
if (!nbd_server) {
|
|
error_setg(errp, "NBD server not running");
|
|
return;
|
|
}
|
|
|
|
nbd_export_close_all();
|
|
|
|
nbd_server_free(nbd_server);
|
|
nbd_server = NULL;
|
|
}
|