migration/socket.c

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