xref: /openbmc/qemu/migration/socket.c (revision 80adf54e)
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 
19 #include "qemu-common.h"
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 "trace.h"
28 
29 
30 static SocketAddress *tcp_build_address(const char *host_port, Error **errp)
31 {
32     SocketAddress *saddr;
33 
34     saddr = g_new0(SocketAddress, 1);
35     saddr->type = SOCKET_ADDRESS_TYPE_INET;
36 
37     if (inet_parse(&saddr->u.inet, host_port, errp)) {
38         qapi_free_SocketAddress(saddr);
39         return NULL;
40     }
41 
42     return saddr;
43 }
44 
45 
46 static SocketAddress *unix_build_address(const char *path)
47 {
48     SocketAddress *saddr;
49 
50     saddr = g_new0(SocketAddress, 1);
51     saddr->type = SOCKET_ADDRESS_TYPE_UNIX;
52     saddr->u.q_unix.path = g_strdup(path);
53 
54     return saddr;
55 }
56 
57 
58 struct SocketConnectData {
59     MigrationState *s;
60     char *hostname;
61 };
62 
63 static void socket_connect_data_free(void *opaque)
64 {
65     struct SocketConnectData *data = opaque;
66     if (!data) {
67         return;
68     }
69     g_free(data->hostname);
70     g_free(data);
71 }
72 
73 static void socket_outgoing_migration(QIOTask *task,
74                                       gpointer opaque)
75 {
76     struct SocketConnectData *data = opaque;
77     QIOChannel *sioc = QIO_CHANNEL(qio_task_get_source(task));
78     Error *err = NULL;
79 
80     if (qio_task_propagate_error(task, &err)) {
81         trace_migration_socket_outgoing_error(error_get_pretty(err));
82         migrate_fd_error(data->s, err);
83         error_free(err);
84     } else {
85         trace_migration_socket_outgoing_connected(data->hostname);
86         migration_channel_connect(data->s, sioc, data->hostname);
87     }
88     object_unref(OBJECT(sioc));
89 }
90 
91 static void socket_start_outgoing_migration(MigrationState *s,
92                                             SocketAddress *saddr,
93                                             Error **errp)
94 {
95     QIOChannelSocket *sioc = qio_channel_socket_new();
96     struct SocketConnectData *data = g_new0(struct SocketConnectData, 1);
97 
98     data->s = s;
99     if (saddr->type == SOCKET_ADDRESS_TYPE_INET) {
100         data->hostname = g_strdup(saddr->u.inet.host);
101     }
102 
103     qio_channel_set_name(QIO_CHANNEL(sioc), "migration-socket-outgoing");
104     qio_channel_socket_connect_async(sioc,
105                                      saddr,
106                                      socket_outgoing_migration,
107                                      data,
108                                      socket_connect_data_free);
109     qapi_free_SocketAddress(saddr);
110 }
111 
112 void tcp_start_outgoing_migration(MigrationState *s,
113                                   const char *host_port,
114                                   Error **errp)
115 {
116     Error *err = NULL;
117     SocketAddress *saddr = tcp_build_address(host_port, &err);
118     if (!err) {
119         socket_start_outgoing_migration(s, saddr, &err);
120     }
121     error_propagate(errp, err);
122 }
123 
124 void unix_start_outgoing_migration(MigrationState *s,
125                                    const char *path,
126                                    Error **errp)
127 {
128     SocketAddress *saddr = unix_build_address(path);
129     socket_start_outgoing_migration(s, saddr, errp);
130 }
131 
132 
133 static gboolean socket_accept_incoming_migration(QIOChannel *ioc,
134                                                  GIOCondition condition,
135                                                  gpointer opaque)
136 {
137     QIOChannelSocket *sioc;
138     Error *err = NULL;
139 
140     sioc = qio_channel_socket_accept(QIO_CHANNEL_SOCKET(ioc),
141                                      &err);
142     if (!sioc) {
143         error_report("could not accept migration connection (%s)",
144                      error_get_pretty(err));
145         goto out;
146     }
147 
148     trace_migration_socket_incoming_accepted();
149 
150     qio_channel_set_name(QIO_CHANNEL(sioc), "migration-socket-incoming");
151     migration_channel_process_incoming(QIO_CHANNEL(sioc));
152     object_unref(OBJECT(sioc));
153 
154 out:
155     /* Close listening socket as its no longer needed */
156     qio_channel_close(ioc, NULL);
157     return FALSE; /* unregister */
158 }
159 
160 
161 static void socket_start_incoming_migration(SocketAddress *saddr,
162                                             Error **errp)
163 {
164     QIOChannelSocket *listen_ioc = qio_channel_socket_new();
165 
166     qio_channel_set_name(QIO_CHANNEL(listen_ioc),
167                          "migration-socket-listener");
168 
169     if (qio_channel_socket_listen_sync(listen_ioc, saddr, errp) < 0) {
170         object_unref(OBJECT(listen_ioc));
171         qapi_free_SocketAddress(saddr);
172         return;
173     }
174 
175     qio_channel_add_watch(QIO_CHANNEL(listen_ioc),
176                           G_IO_IN,
177                           socket_accept_incoming_migration,
178                           listen_ioc,
179                           (GDestroyNotify)object_unref);
180     qapi_free_SocketAddress(saddr);
181 }
182 
183 void tcp_start_incoming_migration(const char *host_port, Error **errp)
184 {
185     Error *err = NULL;
186     SocketAddress *saddr = tcp_build_address(host_port, &err);
187     if (!err) {
188         socket_start_incoming_migration(saddr, &err);
189     }
190     error_propagate(errp, err);
191 }
192 
193 void unix_start_incoming_migration(const char *path, Error **errp)
194 {
195     SocketAddress *saddr = unix_build_address(path);
196     socket_start_incoming_migration(saddr, errp);
197 }
198