]>
Commit | Line | Data |
---|---|---|
6dd844db PB |
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 | ||
d38ea87a | 12 | #include "qemu/osdep.h" |
9c17d615 | 13 | #include "sysemu/blockdev.h" |
e140177d | 14 | #include "sysemu/block-backend.h" |
0d09e41a | 15 | #include "hw/block/block.h" |
7b1b5d19 | 16 | #include "qapi/qmp/qerror.h" |
9c17d615 | 17 | #include "sysemu/sysemu.h" |
6dd844db | 18 | #include "qmp-commands.h" |
737e150e | 19 | #include "block/nbd.h" |
ae398278 | 20 | #include "io/channel-socket.h" |
6dd844db | 21 | |
ddffee39 DB |
22 | typedef struct NBDServerData { |
23 | QIOChannelSocket *listen_ioc; | |
24 | int watch; | |
25 | QCryptoTLSCreds *tlscreds; | |
26 | } NBDServerData; | |
27 | ||
28 | static NBDServerData *nbd_server; | |
29 | ||
ecc7a24c EB |
30 | static void nbd_blockdev_client_closed(NBDClient *client, bool ignored) |
31 | { | |
32 | nbd_client_put(client); | |
33 | } | |
6dd844db | 34 | |
ae398278 DB |
35 | static gboolean nbd_accept(QIOChannel *ioc, GIOCondition condition, |
36 | gpointer opaque) | |
6dd844db | 37 | { |
ae398278 | 38 | QIOChannelSocket *cioc; |
6dd844db | 39 | |
ddffee39 DB |
40 | if (!nbd_server) { |
41 | return FALSE; | |
42 | } | |
43 | ||
ae398278 DB |
44 | cioc = qio_channel_socket_accept(QIO_CHANNEL_SOCKET(ioc), |
45 | NULL); | |
46 | if (!cioc) { | |
47 | return TRUE; | |
48 | } | |
49 | ||
0d73f725 | 50 | qio_channel_set_name(QIO_CHANNEL(cioc), "nbd-server"); |
ddffee39 DB |
51 | nbd_client_new(NULL, cioc, |
52 | nbd_server->tlscreds, NULL, | |
ecc7a24c | 53 | nbd_blockdev_client_closed); |
ae398278 DB |
54 | object_unref(OBJECT(cioc)); |
55 | return TRUE; | |
6dd844db PB |
56 | } |
57 | ||
ddffee39 DB |
58 | |
59 | static void nbd_server_free(NBDServerData *server) | |
6dd844db | 60 | { |
ddffee39 | 61 | if (!server) { |
6dd844db PB |
62 | return; |
63 | } | |
64 | ||
ddffee39 DB |
65 | if (server->watch != -1) { |
66 | g_source_remove(server->watch); | |
67 | } | |
68 | object_unref(OBJECT(server->listen_ioc)); | |
69 | if (server->tlscreds) { | |
70 | object_unref(OBJECT(server->tlscreds)); | |
71 | } | |
72 | ||
73 | g_free(server); | |
74 | } | |
75 | ||
76 | static QCryptoTLSCreds *nbd_get_tls_creds(const char *id, Error **errp) | |
77 | { | |
78 | Object *obj; | |
79 | QCryptoTLSCreds *creds; | |
80 | ||
81 | obj = object_resolve_path_component( | |
82 | object_get_objects_root(), id); | |
83 | if (!obj) { | |
84 | error_setg(errp, "No TLS credentials with id '%s'", | |
85 | id); | |
86 | return NULL; | |
87 | } | |
88 | creds = (QCryptoTLSCreds *) | |
89 | object_dynamic_cast(obj, TYPE_QCRYPTO_TLS_CREDS); | |
90 | if (!creds) { | |
91 | error_setg(errp, "Object with id '%s' is not TLS credentials", | |
92 | id); | |
93 | return NULL; | |
94 | } | |
95 | ||
96 | if (creds->endpoint != QCRYPTO_TLS_CREDS_ENDPOINT_SERVER) { | |
97 | error_setg(errp, | |
98 | "Expecting TLS credentials with a server endpoint"); | |
99 | return NULL; | |
100 | } | |
101 | object_ref(obj); | |
102 | return creds; | |
103 | } | |
104 | ||
105 | ||
106 | void qmp_nbd_server_start(SocketAddress *addr, | |
107 | bool has_tls_creds, const char *tls_creds, | |
108 | Error **errp) | |
109 | { | |
110 | if (nbd_server) { | |
111 | error_setg(errp, "NBD server already running"); | |
ae398278 | 112 | return; |
6dd844db | 113 | } |
ae398278 | 114 | |
ddffee39 DB |
115 | nbd_server = g_new0(NBDServerData, 1); |
116 | nbd_server->watch = -1; | |
117 | nbd_server->listen_ioc = qio_channel_socket_new(); | |
0d73f725 DB |
118 | qio_channel_set_name(QIO_CHANNEL(nbd_server->listen_ioc), |
119 | "nbd-listener"); | |
ddffee39 DB |
120 | if (qio_channel_socket_listen_sync( |
121 | nbd_server->listen_ioc, addr, errp) < 0) { | |
122 | goto error; | |
123 | } | |
124 | ||
125 | if (has_tls_creds) { | |
126 | nbd_server->tlscreds = nbd_get_tls_creds(tls_creds, errp); | |
127 | if (!nbd_server->tlscreds) { | |
128 | goto error; | |
129 | } | |
130 | ||
ca0b64e5 | 131 | /* TODO SOCKET_ADDRESS_KIND_FD where fd has AF_INET or AF_INET6 */ |
ddffee39 DB |
132 | if (addr->type != SOCKET_ADDRESS_KIND_INET) { |
133 | error_setg(errp, "TLS is only supported with IPv4/IPv6"); | |
134 | goto error; | |
135 | } | |
136 | } | |
137 | ||
138 | nbd_server->watch = qio_channel_add_watch( | |
139 | QIO_CHANNEL(nbd_server->listen_ioc), | |
140 | G_IO_IN, | |
141 | nbd_accept, | |
142 | NULL, | |
143 | NULL); | |
144 | ||
145 | return; | |
146 | ||
147 | error: | |
148 | nbd_server_free(nbd_server); | |
149 | nbd_server = NULL; | |
6dd844db PB |
150 | } |
151 | ||
6dd844db PB |
152 | void qmp_nbd_server_add(const char *device, bool has_writable, bool writable, |
153 | Error **errp) | |
154 | { | |
094138d0 KW |
155 | BlockDriverState *bs = NULL; |
156 | BlockBackend *on_eject_blk; | |
6dd844db | 157 | NBDExport *exp; |
6dd844db | 158 | |
ddffee39 | 159 | if (!nbd_server) { |
17b6be4a PB |
160 | error_setg(errp, "NBD server not running"); |
161 | return; | |
162 | } | |
163 | ||
6dd844db PB |
164 | if (nbd_export_find(device)) { |
165 | error_setg(errp, "NBD server already exporting device '%s'", device); | |
166 | return; | |
167 | } | |
168 | ||
094138d0 KW |
169 | on_eject_blk = blk_by_name(device); |
170 | ||
171 | bs = bdrv_lookup_bs(device, device, errp); | |
172 | if (!bs) { | |
60fe4fac HB |
173 | return; |
174 | } | |
6dd844db | 175 | |
e6444734 | 176 | if (!has_writable) { |
f3313d23 | 177 | writable = false; |
e6444734 | 178 | } |
094138d0 | 179 | if (bdrv_is_read_only(bs)) { |
e6444734 PB |
180 | writable = false; |
181 | } | |
182 | ||
094138d0 KW |
183 | exp = nbd_export_new(bs, 0, -1, writable ? 0 : NBD_FLAG_READ_ONLY, |
184 | NULL, false, on_eject_blk, errp); | |
98f44bbe HR |
185 | if (!exp) { |
186 | return; | |
187 | } | |
6dd844db PB |
188 | |
189 | nbd_export_set_name(exp, device); | |
6dd844db | 190 | |
741cc431 HR |
191 | /* The list of named exports has a strong reference to this export now and |
192 | * our only way of accessing it is through nbd_export_find(), so we can drop | |
193 | * the strong reference that is @exp. */ | |
194 | nbd_export_put(exp); | |
6dd844db PB |
195 | } |
196 | ||
197 | void qmp_nbd_server_stop(Error **errp) | |
198 | { | |
741cc431 | 199 | nbd_export_close_all(); |
6dd844db | 200 | |
ddffee39 DB |
201 | nbd_server_free(nbd_server); |
202 | nbd_server = NULL; | |
6dd844db | 203 | } |