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
  19 #include "qemu-common.h"
  20 #include "qemu/error-report.h"
  21 #include "qapi/error.h"
  22 #include "channel.h"
  23 #include "migration/migration.h"
  24 #include "migration/qemu-file.h"
  25 #include "io/channel-socket.h"
  26 #include "trace.h"
  27
  28
  29 static SocketAddress *tcp_build_address(const char *host_port, Error **errp)
  30 {
  31     SocketAddress *saddr;
  32
  33     saddr = g_new0(SocketAddress, 1);
  34     saddr->type = SOCKET_ADDRESS_TYPE_INET;
  35
  36     if (inet_parse(&saddr->u.inet, host_port, errp)) {
  37         qapi_free_SocketAddress(saddr);
  38         return NULL;
  39     }
  40
  41     return saddr;
  42 }
  43
  44
  45 static SocketAddress *unix_build_address(const char *path)
  46 {
  47     SocketAddress *saddr;
  48
  49     saddr = g_new0(SocketAddress, 1);
  50     saddr->type = SOCKET_ADDRESS_TYPE_UNIX;
  51     saddr->u.q_unix.path = g_strdup(path);
  52
  53     return saddr;
  54 }
  55
  56
  57 struct SocketConnectData {
  58     MigrationState *s;
  59     char *hostname;
  60 };
  61
  62 static void socket_connect_data_free(void *opaque)
  63 {
  64     struct SocketConnectData *data = opaque;
  65     if (!data) {
  66         return;
  67     }
  68     g_free(data->hostname);
  69     g_free(data);
  70 }
  71
  72 static void socket_outgoing_migration(QIOTask *task,
  73                                       gpointer opaque)
  74 {
  75     struct SocketConnectData *data = opaque;
  76     QIOChannel *sioc = QIO_CHANNEL(qio_task_get_source(task));
  77     Error *err = NULL;
  78
  79     if (qio_task_propagate_error(task, &err)) {
  80         trace_migration_socket_outgoing_error(error_get_pretty(err));
  81         migrate_fd_error(data->s, err);
  82         error_free(err);
  83     } else {
  84         trace_migration_socket_outgoing_connected(data->hostname);
  85         migration_channel_connect(data->s, sioc, data->hostname);
  86     }
  87     object_unref(OBJECT(sioc));
  88 }
  89
  90 static void socket_start_outgoing_migration(MigrationState *s,
  91                                             SocketAddress *saddr,
  92                                             Error **errp)
  93 {
  94     QIOChannelSocket *sioc = qio_channel_socket_new();
  95     struct SocketConnectData *data = g_new0(struct SocketConnectData, 1);
  96
  97     data->s = s;
  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     qapi_free_SocketAddress(saddr);
 109 }
 110
 111 void tcp_start_outgoing_migration(MigrationState *s,
 112                                   const char *host_port,
 113                                   Error **errp)
 114 {
 115     Error *err = NULL;
 116     SocketAddress *saddr = tcp_build_address(host_port, &err);
 117     if (!err) {
 118         socket_start_outgoing_migration(s, saddr, &err);
 119     }
 120     error_propagate(errp, err);
 121 }
 122
 123 void unix_start_outgoing_migration(MigrationState *s,
 124                                    const char *path,
 125                                    Error **errp)
 126 {
 127     SocketAddress *saddr = unix_build_address(path);
 128     socket_start_outgoing_migration(s, saddr, errp);
 129 }
 130
 131
 132 static gboolean socket_accept_incoming_migration(QIOChannel *ioc,
 133                                                  GIOCondition condition,
 134                                                  gpointer opaque)
 135 {
 136     QIOChannelSocket *sioc;
 137     Error *err = NULL;
 138
 139     sioc = qio_channel_socket_accept(QIO_CHANNEL_SOCKET(ioc),
 140                                      &err);
 141     if (!sioc) {
 142         error_report("could not accept migration connection (%s)",
 143                      error_get_pretty(err));
 144         goto out;
 145     }
 146
 147     trace_migration_socket_incoming_accepted();
 148
 149     qio_channel_set_name(QIO_CHANNEL(sioc), "migration-socket-incoming");
 150     migration_channel_process_incoming(migrate_get_current(),
 151                                        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 }