1 | /* |
2 | * QEMU live migration via socket |
3 | * |
4 | * Copyright Red Hat, Inc. 2009-2016 |
5 | * |
6 | * Authors: |
7 | * Chris Lalancette <clalance@redhat.com> |
8 | * Daniel P. Berrange <berrange@redhat.com> |
9 | * |
10 | * This work is licensed under the terms of the GNU GPL, version 2. See |
11 | * the COPYING file in the top-level directory. |
12 | * |
13 | * Contributions after 2012-01-13 are licensed under the terms of the |
14 | * GNU GPL, version 2 or (at your option) any later version. |
15 | */ |
16 | |
17 | #include "qemu/osdep.h" |
18 | #include "qemu/cutils.h" |
19 | |
20 | #include "qemu/error-report.h" |
21 | #include "qapi/error.h" |
22 | #include "channel.h" |
23 | #include "socket.h" |
24 | #include "migration.h" |
25 | #include "qemu-file.h" |
26 | #include "io/channel-socket.h" |
27 | #include "io/net-listener.h" |
28 | #include "trace.h" |
29 | |
30 | |
31 | struct SocketOutgoingArgs { |
32 | SocketAddress *saddr; |
33 | } outgoing_args; |
34 | |
35 | void socket_send_channel_create(QIOTaskFunc f, void *data) |
36 | { |
37 | QIOChannelSocket *sioc = qio_channel_socket_new(); |
38 | qio_channel_socket_connect_async(sioc, outgoing_args.saddr, |
39 | f, data, NULL, NULL); |
40 | } |
41 | |
42 | int socket_send_channel_destroy(QIOChannel *send) |
43 | { |
44 | /* Remove channel */ |
45 | object_unref(OBJECT(send)); |
46 | if (outgoing_args.saddr) { |
47 | qapi_free_SocketAddress(outgoing_args.saddr); |
48 | outgoing_args.saddr = NULL; |
49 | } |
50 | return 0; |
51 | } |
52 | |
53 | static SocketAddress *tcp_build_address(const char *host_port, Error **errp) |
54 | { |
55 | SocketAddress *saddr; |
56 | |
57 | saddr = g_new0(SocketAddress, 1); |
58 | saddr->type = SOCKET_ADDRESS_TYPE_INET; |
59 | |
60 | if (inet_parse(&saddr->u.inet, host_port, errp)) { |
61 | qapi_free_SocketAddress(saddr); |
62 | return NULL; |
63 | } |
64 | |
65 | return saddr; |
66 | } |
67 | |
68 | |
69 | static SocketAddress *unix_build_address(const char *path) |
70 | { |
71 | SocketAddress *saddr; |
72 | |
73 | saddr = g_new0(SocketAddress, 1); |
74 | saddr->type = SOCKET_ADDRESS_TYPE_UNIX; |
75 | saddr->u.q_unix.path = g_strdup(path); |
76 | |
77 | return saddr; |
78 | } |
79 | |
80 | |
81 | struct SocketConnectData { |
82 | MigrationState *s; |
83 | char *hostname; |
84 | }; |
85 | |
86 | static void socket_connect_data_free(void *opaque) |
87 | { |
88 | struct SocketConnectData *data = opaque; |
89 | if (!data) { |
90 | return; |
91 | } |
92 | g_free(data->hostname); |
93 | g_free(data); |
94 | } |
95 | |
96 | static void socket_outgoing_migration(QIOTask *task, |
97 | gpointer opaque) |
98 | { |
99 | struct SocketConnectData *data = opaque; |
100 | QIOChannel *sioc = QIO_CHANNEL(qio_task_get_source(task)); |
101 | Error *err = NULL; |
102 | |
103 | if (qio_task_propagate_error(task, &err)) { |
104 | trace_migration_socket_outgoing_error(error_get_pretty(err)); |
105 | } else { |
106 | trace_migration_socket_outgoing_connected(data->hostname); |
107 | } |
108 | migration_channel_connect(data->s, sioc, data->hostname, err); |
109 | object_unref(OBJECT(sioc)); |
110 | } |
111 | |
112 | static void socket_start_outgoing_migration(MigrationState *s, |
113 | SocketAddress *saddr, |
114 | Error **errp) |
115 | { |
116 | QIOChannelSocket *sioc = qio_channel_socket_new(); |
117 | struct SocketConnectData *data = g_new0(struct SocketConnectData, 1); |
118 | |
119 | data->s = s; |
120 | |
121 | /* in case previous migration leaked it */ |
122 | qapi_free_SocketAddress(outgoing_args.saddr); |
123 | outgoing_args.saddr = saddr; |
124 | |
125 | if (saddr->type == SOCKET_ADDRESS_TYPE_INET) { |
126 | data->hostname = g_strdup(saddr->u.inet.host); |
127 | } |
128 | |
129 | qio_channel_set_name(QIO_CHANNEL(sioc), "migration-socket-outgoing" ); |
130 | qio_channel_socket_connect_async(sioc, |
131 | saddr, |
132 | socket_outgoing_migration, |
133 | data, |
134 | socket_connect_data_free, |
135 | NULL); |
136 | } |
137 | |
138 | void tcp_start_outgoing_migration(MigrationState *s, |
139 | const char *host_port, |
140 | Error **errp) |
141 | { |
142 | Error *err = NULL; |
143 | SocketAddress *saddr = tcp_build_address(host_port, &err); |
144 | if (!err) { |
145 | socket_start_outgoing_migration(s, saddr, &err); |
146 | } |
147 | error_propagate(errp, err); |
148 | } |
149 | |
150 | void unix_start_outgoing_migration(MigrationState *s, |
151 | const char *path, |
152 | Error **errp) |
153 | { |
154 | SocketAddress *saddr = unix_build_address(path); |
155 | socket_start_outgoing_migration(s, saddr, errp); |
156 | } |
157 | |
158 | |
159 | static void socket_accept_incoming_migration(QIONetListener *listener, |
160 | QIOChannelSocket *cioc, |
161 | gpointer opaque) |
162 | { |
163 | trace_migration_socket_incoming_accepted(); |
164 | |
165 | qio_channel_set_name(QIO_CHANNEL(cioc), "migration-socket-incoming" ); |
166 | migration_channel_process_incoming(QIO_CHANNEL(cioc)); |
167 | |
168 | if (migration_has_all_channels()) { |
169 | /* Close listening socket as its no longer needed */ |
170 | qio_net_listener_disconnect(listener); |
171 | object_unref(OBJECT(listener)); |
172 | } |
173 | } |
174 | |
175 | |
176 | static void socket_start_incoming_migration(SocketAddress *saddr, |
177 | Error **errp) |
178 | { |
179 | QIONetListener *listener = qio_net_listener_new(); |
180 | size_t i; |
181 | int num = 1; |
182 | |
183 | qio_net_listener_set_name(listener, "migration-socket-listener" ); |
184 | |
185 | if (migrate_use_multifd()) { |
186 | num = migrate_multifd_channels(); |
187 | } |
188 | |
189 | if (qio_net_listener_open_sync(listener, saddr, num, errp) < 0) { |
190 | object_unref(OBJECT(listener)); |
191 | return; |
192 | } |
193 | |
194 | qio_net_listener_set_client_func_full(listener, |
195 | socket_accept_incoming_migration, |
196 | NULL, NULL, |
197 | g_main_context_get_thread_default()); |
198 | |
199 | for (i = 0; i < listener->nsioc; i++) { |
200 | SocketAddress *address = |
201 | qio_channel_socket_get_local_address(listener->sioc[i], errp); |
202 | if (!address) { |
203 | return; |
204 | } |
205 | migrate_add_address(address); |
206 | qapi_free_SocketAddress(address); |
207 | } |
208 | } |
209 | |
210 | void tcp_start_incoming_migration(const char *host_port, Error **errp) |
211 | { |
212 | Error *err = NULL; |
213 | SocketAddress *saddr = tcp_build_address(host_port, &err); |
214 | if (!err) { |
215 | socket_start_incoming_migration(saddr, &err); |
216 | } |
217 | qapi_free_SocketAddress(saddr); |
218 | error_propagate(errp, err); |
219 | } |
220 | |
221 | void unix_start_incoming_migration(const char *path, Error **errp) |
222 | { |
223 | SocketAddress *saddr = unix_build_address(path); |
224 | socket_start_incoming_migration(saddr, errp); |
225 | qapi_free_SocketAddress(saddr); |
226 | } |
227 | |