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12#include "qemu/osdep.h"
13#include "sysemu/blockdev.h"
14#include "sysemu/block-backend.h"
15#include "hw/block/block.h"
16#include "qapi/error.h"
17#include "qapi/clone-visitor.h"
18#include "qapi/qapi-visit-block-export.h"
19#include "qapi/qapi-commands-block-export.h"
20#include "block/nbd.h"
21#include "io/channel-socket.h"
22#include "io/net-listener.h"
23
24typedef struct NBDServerData {
25 QIONetListener *listener;
26 QCryptoTLSCreds *tlscreds;
27 char *tlsauthz;
28 uint32_t max_connections;
29 uint32_t connections;
30} NBDServerData;
31
32static NBDServerData *nbd_server;
33static bool is_qemu_nbd;
34
35static void nbd_update_server_watch(NBDServerData *s);
36
37void nbd_server_is_qemu_nbd(bool value)
38{
39 is_qemu_nbd = value;
40}
41
42bool nbd_server_is_running(void)
43{
44 return nbd_server || is_qemu_nbd;
45}
46
47static void nbd_blockdev_client_closed(NBDClient *client, bool ignored)
48{
49 nbd_client_put(client);
50 assert(nbd_server->connections > 0);
51 nbd_server->connections--;
52 nbd_update_server_watch(nbd_server);
53}
54
55static void nbd_accept(QIONetListener *listener, QIOChannelSocket *cioc,
56 gpointer opaque)
57{
58 nbd_server->connections++;
59 nbd_update_server_watch(nbd_server);
60
61 qio_channel_set_name(QIO_CHANNEL(cioc), "nbd-server");
62 nbd_client_new(cioc, nbd_server->tlscreds, nbd_server->tlsauthz,
63 nbd_blockdev_client_closed);
64}
65
66static void nbd_update_server_watch(NBDServerData *s)
67{
68 if (!s->max_connections || s->connections < s->max_connections) {
69 qio_net_listener_set_client_func(s->listener, nbd_accept, NULL, NULL);
70 } else {
71 qio_net_listener_set_client_func(s->listener, NULL, NULL, NULL);
72 }
73}
74
75static void nbd_server_free(NBDServerData *server)
76{
77 if (!server) {
78 return;
79 }
80
81 qio_net_listener_disconnect(server->listener);
82 object_unref(OBJECT(server->listener));
83 if (server->tlscreds) {
84 object_unref(OBJECT(server->tlscreds));
85 }
86 g_free(server->tlsauthz);
87
88 g_free(server);
89}
90
91static QCryptoTLSCreds *nbd_get_tls_creds(const char *id, Error **errp)
92{
93 Object *obj;
94 QCryptoTLSCreds *creds;
95
96 obj = object_resolve_path_component(
97 object_get_objects_root(), id);
98 if (!obj) {
99 error_setg(errp, "No TLS credentials with id '%s'",
100 id);
101 return NULL;
102 }
103 creds = (QCryptoTLSCreds *)
104 object_dynamic_cast(obj, TYPE_QCRYPTO_TLS_CREDS);
105 if (!creds) {
106 error_setg(errp, "Object with id '%s' is not TLS credentials",
107 id);
108 return NULL;
109 }
110
111 if (!qcrypto_tls_creds_check_endpoint(creds,
112 QCRYPTO_TLS_CREDS_ENDPOINT_SERVER,
113 errp)) {
114 return NULL;
115 }
116 object_ref(obj);
117 return creds;
118}
119
120
121void nbd_server_start(SocketAddress *addr, const char *tls_creds,
122 const char *tls_authz, uint32_t max_connections,
123 Error **errp)
124{
125 if (nbd_server) {
126 error_setg(errp, "NBD server already running");
127 return;
128 }
129
130 nbd_server = g_new0(NBDServerData, 1);
131 nbd_server->max_connections = max_connections;
132 nbd_server->listener = qio_net_listener_new();
133
134 qio_net_listener_set_name(nbd_server->listener,
135 "nbd-listener");
136
137
138
139
140
141 if (qio_net_listener_open_sync(nbd_server->listener, addr, SOMAXCONN,
142 errp) < 0) {
143 goto error;
144 }
145
146 if (tls_creds) {
147 nbd_server->tlscreds = nbd_get_tls_creds(tls_creds, errp);
148 if (!nbd_server->tlscreds) {
149 goto error;
150 }
151 }
152
153 nbd_server->tlsauthz = g_strdup(tls_authz);
154
155 nbd_update_server_watch(nbd_server);
156
157 return;
158
159 error:
160 nbd_server_free(nbd_server);
161 nbd_server = NULL;
162}
163
164void nbd_server_start_options(NbdServerOptions *arg, Error **errp)
165{
166 nbd_server_start(arg->addr, arg->tls_creds, arg->tls_authz,
167 arg->max_connections, errp);
168}
169
170void qmp_nbd_server_start(SocketAddressLegacy *addr,
171 bool has_tls_creds, const char *tls_creds,
172 bool has_tls_authz, const char *tls_authz,
173 bool has_max_connections, uint32_t max_connections,
174 Error **errp)
175{
176 SocketAddress *addr_flat = socket_address_flatten(addr);
177
178 nbd_server_start(addr_flat, tls_creds, tls_authz, max_connections, errp);
179 qapi_free_SocketAddress(addr_flat);
180}
181
182void qmp_nbd_server_add(NbdServerAddOptions *arg, Error **errp)
183{
184 BlockExport *export;
185 BlockDriverState *bs;
186 BlockBackend *on_eject_blk;
187 BlockExportOptions *export_opts;
188
189 bs = bdrv_lookup_bs(arg->device, arg->device, errp);
190 if (!bs) {
191 return;
192 }
193
194
195
196
197
198 if (!arg->has_name) {
199 arg->has_name = true;
200 arg->name = g_strdup(arg->device);
201 }
202
203 export_opts = g_new(BlockExportOptions, 1);
204 *export_opts = (BlockExportOptions) {
205 .type = BLOCK_EXPORT_TYPE_NBD,
206 .id = g_strdup(arg->name),
207 .node_name = g_strdup(bdrv_get_node_name(bs)),
208 .has_writable = arg->has_writable,
209 .writable = arg->writable,
210 };
211 QAPI_CLONE_MEMBERS(BlockExportOptionsNbdBase, &export_opts->u.nbd,
212 qapi_NbdServerAddOptions_base(arg));
213 if (arg->has_bitmap) {
214 export_opts->u.nbd.has_bitmaps = true;
215 QAPI_LIST_PREPEND(export_opts->u.nbd.bitmaps, g_strdup(arg->bitmap));
216 }
217
218
219
220
221
222
223 if (bdrv_is_read_only(bs)) {
224 export_opts->has_writable = true;
225 export_opts->writable = false;
226 }
227
228 export = blk_exp_add(export_opts, errp);
229 if (!export) {
230 goto fail;
231 }
232
233
234
235
236
237 on_eject_blk = blk_by_name(arg->device);
238 if (on_eject_blk) {
239 nbd_export_set_on_eject_blk(export, on_eject_blk);
240 }
241
242fail:
243 qapi_free_BlockExportOptions(export_opts);
244}
245
246void qmp_nbd_server_remove(const char *name,
247 bool has_mode, BlockExportRemoveMode mode,
248 Error **errp)
249{
250 BlockExport *exp;
251
252 exp = blk_exp_find(name);
253 if (exp && exp->drv->type != BLOCK_EXPORT_TYPE_NBD) {
254 error_setg(errp, "Block export '%s' is not an NBD export", name);
255 return;
256 }
257
258 qmp_block_export_del(name, has_mode, mode, errp);
259}
260
261void qmp_nbd_server_stop(Error **errp)
262{
263 if (!nbd_server) {
264 error_setg(errp, "NBD server not running");
265 return;
266 }
267
268 blk_exp_close_all_type(BLOCK_EXPORT_TYPE_NBD);
269
270 nbd_server_free(nbd_server);
271 nbd_server = NULL;
272}
273