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1 | /* | |
2 | * Serving QEMU block devices via NBD | |
3 | * | |
4 | * Copyright (c) 2012 Red Hat, Inc. | |
5 | * | |
6 | * Author: Paolo Bonzini <pbonzini@redhat.com> | |
7 | * | |
8 | * This work is licensed under the terms of the GNU GPL, version 2 or | |
9 | * later. See the COPYING file in the top-level directory. | |
10 | */ | |
11 | ||
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/qapi-commands-block.h" | |
18 | #include "sysemu/sysemu.h" | |
19 | #include "block/nbd.h" | |
20 | #include "io/channel-socket.h" | |
21 | #include "io/net-listener.h" | |
22 | ||
23 | typedef struct NBDServerData { | |
24 | QIONetListener *listener; | |
25 | QCryptoTLSCreds *tlscreds; | |
26 | char *tlsauthz; | |
27 | } NBDServerData; | |
28 | ||
29 | static NBDServerData *nbd_server; | |
30 | ||
31 | static void nbd_blockdev_client_closed(NBDClient *client, bool ignored) | |
32 | { | |
33 | nbd_client_put(client); | |
34 | } | |
35 | ||
36 | static void nbd_accept(QIONetListener *listener, QIOChannelSocket *cioc, | |
37 | gpointer opaque) | |
38 | { | |
39 | qio_channel_set_name(QIO_CHANNEL(cioc), "nbd-server"); | |
40 | nbd_client_new(cioc, nbd_server->tlscreds, nbd_server->tlsauthz, | |
41 | nbd_blockdev_client_closed); | |
42 | } | |
43 | ||
44 | ||
45 | static void nbd_server_free(NBDServerData *server) | |
46 | { | |
47 | if (!server) { | |
48 | return; | |
49 | } | |
50 | ||
51 | qio_net_listener_disconnect(server->listener); | |
52 | object_unref(OBJECT(server->listener)); | |
53 | if (server->tlscreds) { | |
54 | object_unref(OBJECT(server->tlscreds)); | |
55 | } | |
56 | g_free(server->tlsauthz); | |
57 | ||
58 | g_free(server); | |
59 | } | |
60 | ||
61 | static QCryptoTLSCreds *nbd_get_tls_creds(const char *id, Error **errp) | |
62 | { | |
63 | Object *obj; | |
64 | QCryptoTLSCreds *creds; | |
65 | ||
66 | obj = object_resolve_path_component( | |
67 | object_get_objects_root(), id); | |
68 | if (!obj) { | |
69 | error_setg(errp, "No TLS credentials with id '%s'", | |
70 | id); | |
71 | return NULL; | |
72 | } | |
73 | creds = (QCryptoTLSCreds *) | |
74 | object_dynamic_cast(obj, TYPE_QCRYPTO_TLS_CREDS); | |
75 | if (!creds) { | |
76 | error_setg(errp, "Object with id '%s' is not TLS credentials", | |
77 | id); | |
78 | return NULL; | |
79 | } | |
80 | ||
81 | if (creds->endpoint != QCRYPTO_TLS_CREDS_ENDPOINT_SERVER) { | |
82 | error_setg(errp, | |
83 | "Expecting TLS credentials with a server endpoint"); | |
84 | return NULL; | |
85 | } | |
86 | object_ref(obj); | |
87 | return creds; | |
88 | } | |
89 | ||
90 | ||
91 | void nbd_server_start(SocketAddress *addr, const char *tls_creds, | |
92 | const char *tls_authz, Error **errp) | |
93 | { | |
94 | if (nbd_server) { | |
95 | error_setg(errp, "NBD server already running"); | |
96 | return; | |
97 | } | |
98 | ||
99 | nbd_server = g_new0(NBDServerData, 1); | |
100 | nbd_server->listener = qio_net_listener_new(); | |
101 | ||
102 | qio_net_listener_set_name(nbd_server->listener, | |
103 | "nbd-listener"); | |
104 | ||
105 | if (qio_net_listener_open_sync(nbd_server->listener, addr, errp) < 0) { | |
106 | goto error; | |
107 | } | |
108 | ||
109 | if (tls_creds) { | |
110 | nbd_server->tlscreds = nbd_get_tls_creds(tls_creds, errp); | |
111 | if (!nbd_server->tlscreds) { | |
112 | goto error; | |
113 | } | |
114 | ||
115 | /* TODO SOCKET_ADDRESS_TYPE_FD where fd has AF_INET or AF_INET6 */ | |
116 | if (addr->type != SOCKET_ADDRESS_TYPE_INET) { | |
117 | error_setg(errp, "TLS is only supported with IPv4/IPv6"); | |
118 | goto error; | |
119 | } | |
120 | } | |
121 | ||
122 | nbd_server->tlsauthz = g_strdup(tls_authz); | |
123 | ||
124 | qio_net_listener_set_client_func(nbd_server->listener, | |
125 | nbd_accept, | |
126 | NULL, | |
127 | NULL); | |
128 | ||
129 | return; | |
130 | ||
131 | error: | |
132 | nbd_server_free(nbd_server); | |
133 | nbd_server = NULL; | |
134 | } | |
135 | ||
136 | void qmp_nbd_server_start(SocketAddressLegacy *addr, | |
137 | bool has_tls_creds, const char *tls_creds, | |
138 | bool has_tls_authz, const char *tls_authz, | |
139 | Error **errp) | |
140 | { | |
141 | SocketAddress *addr_flat = socket_address_flatten(addr); | |
142 | ||
143 | nbd_server_start(addr_flat, tls_creds, tls_authz, errp); | |
144 | qapi_free_SocketAddress(addr_flat); | |
145 | } | |
146 | ||
147 | void qmp_nbd_server_add(const char *device, bool has_name, const char *name, | |
148 | bool has_writable, bool writable, | |
149 | bool has_bitmap, const char *bitmap, Error **errp) | |
150 | { | |
151 | BlockDriverState *bs = NULL; | |
152 | BlockBackend *on_eject_blk; | |
153 | NBDExport *exp; | |
154 | int64_t len; | |
155 | ||
156 | if (!nbd_server) { | |
157 | error_setg(errp, "NBD server not running"); | |
158 | return; | |
159 | } | |
160 | ||
161 | if (!has_name) { | |
162 | name = device; | |
163 | } | |
164 | ||
165 | if (nbd_export_find(name)) { | |
166 | error_setg(errp, "NBD server already has export named '%s'", name); | |
167 | return; | |
168 | } | |
169 | ||
170 | on_eject_blk = blk_by_name(device); | |
171 | ||
172 | bs = bdrv_lookup_bs(device, device, errp); | |
173 | if (!bs) { | |
174 | return; | |
175 | } | |
176 | ||
177 | len = bdrv_getlength(bs); | |
178 | if (len < 0) { | |
179 | error_setg_errno(errp, -len, | |
180 | "Failed to determine the NBD export's length"); | |
181 | return; | |
182 | } | |
183 | ||
184 | if (!has_writable) { | |
185 | writable = false; | |
186 | } | |
187 | if (bdrv_is_read_only(bs)) { | |
188 | writable = false; | |
189 | } | |
190 | ||
191 | exp = nbd_export_new(bs, 0, len, name, NULL, bitmap, | |
192 | writable ? 0 : NBD_FLAG_READ_ONLY, | |
193 | NULL, false, on_eject_blk, errp); | |
194 | if (!exp) { | |
195 | return; | |
196 | } | |
197 | ||
198 | /* The list of named exports has a strong reference to this export now and | |
199 | * our only way of accessing it is through nbd_export_find(), so we can drop | |
200 | * the strong reference that is @exp. */ | |
201 | nbd_export_put(exp); | |
202 | } | |
203 | ||
204 | void qmp_nbd_server_remove(const char *name, | |
205 | bool has_mode, NbdServerRemoveMode mode, | |
206 | Error **errp) | |
207 | { | |
208 | NBDExport *exp; | |
209 | ||
210 | if (!nbd_server) { | |
211 | error_setg(errp, "NBD server not running"); | |
212 | return; | |
213 | } | |
214 | ||
215 | exp = nbd_export_find(name); | |
216 | if (exp == NULL) { | |
217 | error_setg(errp, "Export '%s' is not found", name); | |
218 | return; | |
219 | } | |
220 | ||
221 | if (!has_mode) { | |
222 | mode = NBD_SERVER_REMOVE_MODE_SAFE; | |
223 | } | |
224 | ||
225 | nbd_export_remove(exp, mode, errp); | |
226 | } | |
227 | ||
228 | void qmp_nbd_server_stop(Error **errp) | |
229 | { | |
230 | if (!nbd_server) { | |
231 | error_setg(errp, "NBD server not running"); | |
232 | return; | |
233 | } | |
234 | ||
235 | nbd_export_close_all(); | |
236 | ||
237 | nbd_server_free(nbd_server); | |
238 | nbd_server = NULL; | |
239 | } |