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/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 struct SocketConnectData {
  54     MigrationState *s;
  55     char *hostname;
  56 };
  57
  58 static void socket_connect_data_free(void *opaque)
  59 {
  60     struct SocketConnectData *data = opaque;
  61     if (!data) {
  62         return;
  63     }
  64     g_free(data->hostname);
  65     g_free(data);
  66 }
  67
  68 static void socket_outgoing_migration(QIOTask *task,
  69                                       gpointer opaque)
  70 {
  71     struct SocketConnectData *data = opaque;
  72     QIOChannel *sioc = QIO_CHANNEL(qio_task_get_source(task));
  73     Error *err = NULL;
  74
  75     if (qio_task_propagate_error(task, &err)) {
  76         trace_migration_socket_outgoing_error(error_get_pretty(err));
  77     } else {
  78         trace_migration_socket_outgoing_connected(data->hostname);
  79     }
  80     migration_channel_connect(data->s, sioc, data->hostname, err);
  81     object_unref(OBJECT(sioc));
  82 }
  83
  84 static void
  85 socket_start_outgoing_migration_internal(MigrationState *s,
  86                                          SocketAddress *saddr,
  87                                          Error **errp)
  88 {
  89     QIOChannelSocket *sioc = qio_channel_socket_new();
  90     struct SocketConnectData *data = g_new0(struct SocketConnectData, 1);
  91
  92     data->s = s;
  93
  94     /* in case previous migration leaked it */
  95     qapi_free_SocketAddress(outgoing_args.saddr);
  96     outgoing_args.saddr = saddr;
  97
  98     if (saddr->type == SOCKET_ADDRESS_TYPE_INET) {
  99         data->hostname = g_strdup(saddr->u.inet.host);
 100     }
 101
 102     qio_channel_set_name(QIO_CHANNEL(sioc), "migration-socket-outgoing");
 103     qio_channel_socket_connect_async(sioc,
 104                                      saddr,
 105                                      socket_outgoing_migration,
 106                                      data,
 107                                      socket_connect_data_free,
 108                                      NULL);
 109 }
 110
 111 void socket_start_outgoing_migration(MigrationState *s,
 112                                      const char *str,
 113                                      Error **errp)
 114 {
 115     Error *err = NULL;
 116     SocketAddress *saddr = socket_parse(str, &err);
 117     if (!err) {
 118         socket_start_outgoing_migration_internal(s, saddr, &err);
 119     }
 120     error_propagate(errp, err);
 121 }
 122
 123 static void socket_accept_incoming_migration(QIONetListener *listener,
 124                                              QIOChannelSocket *cioc,
 125                                              gpointer opaque)
 126 {
 127     trace_migration_socket_incoming_accepted();
 128
 129     if (migration_has_all_channels()) {
 130         error_report("%s: Extra incoming migration connection; ignoring",
 131                      __func__);
 132         return;
 133     }
 134
 135     qio_channel_set_name(QIO_CHANNEL(cioc), "migration-socket-incoming");
 136     migration_channel_process_incoming(QIO_CHANNEL(cioc));
 137 }
 138
 139 static void
 140 socket_incoming_migration_end(void *opaque)
 141 {
 142     QIONetListener *listener = opaque;
 143
 144     qio_net_listener_disconnect(listener);
 145     object_unref(OBJECT(listener));
 146 }
 147
 148 static void
 149 socket_start_incoming_migration_internal(SocketAddress *saddr,
 150                                          Error **errp)
 151 {
 152     QIONetListener *listener = qio_net_listener_new();
 153     MigrationIncomingState *mis = migration_incoming_get_current();
 154     size_t i;
 155     int num = 1;
 156
 157     qio_net_listener_set_name(listener, "migration-socket-listener");
 158
 159     if (migrate_use_multifd()) {
 160         num = migrate_multifd_channels();
 161     }
 162
 163     if (qio_net_listener_open_sync(listener, saddr, num, errp) < 0) {
 164         object_unref(OBJECT(listener));
 165         return;
 166     }
 167
 168     mis->transport_data = listener;
 169     mis->transport_cleanup = socket_incoming_migration_end;
 170
 171     qio_net_listener_set_client_func_full(listener,
 172                                           socket_accept_incoming_migration,
 173                                           NULL, NULL,
 174                                           g_main_context_get_thread_default());
 175
 176     for (i = 0; i < listener->nsioc; i++)  {
 177         SocketAddress *address =
 178             qio_channel_socket_get_local_address(listener->sioc[i], errp);
 179         if (!address) {
 180             return;
 181         }
 182         migrate_add_address(address);
 183         qapi_free_SocketAddress(address);
 184     }
 185 }
 186
 187 void socket_start_incoming_migration(const char *str, Error **errp)
 188 {
 189     Error *err = NULL;
 190     SocketAddress *saddr = socket_parse(str, &err);
 191     if (!err) {
 192         socket_start_incoming_migration_internal(saddr, &err);
 193     }
 194     qapi_free_SocketAddress(saddr);
 195     error_propagate(errp, err);
 196 }