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 "migration/migration.h"
  23 #include "migration/qemu-file.h"
  24 #include "io/channel-socket.h"
  25 #include "trace.h"
  26
  27
  28 static SocketAddress *tcp_build_address(const char *host_port, Error **errp)
  29 {
  30     SocketAddress *saddr;
  31
  32     saddr = g_new0(SocketAddress, 1);
  33     saddr->type = SOCKET_ADDRESS_TYPE_INET;
  34
  35     if (inet_parse(&saddr->u.inet, host_port, errp)) {
  36         qapi_free_SocketAddress(saddr);
  37         return NULL;
  38     }
  39
  40     return saddr;
  41 }
  42
  43
  44 static SocketAddress *unix_build_address(const char *path)
  45 {
  46     SocketAddress *saddr;
  47
  48     saddr = g_new0(SocketAddress, 1);
  49     saddr->type = SOCKET_ADDRESS_TYPE_UNIX;
  50     saddr->u.q_unix.path = g_strdup(path);
  51
  52     return saddr;
  53 }
  54
  55
  56 struct SocketConnectData {
  57     MigrationState *s;
  58     char *hostname;
  59 };
  60
  61 static void socket_connect_data_free(void *opaque)
  62 {
  63     struct SocketConnectData *data = opaque;
  64     if (!data) {
  65         return;
  66     }
  67     g_free(data->hostname);
  68     g_free(data);
  69 }
  70
  71 static void socket_outgoing_migration(QIOTask *task,
  72                                       gpointer opaque)
  73 {
  74     struct SocketConnectData *data = opaque;
  75     QIOChannel *sioc = QIO_CHANNEL(qio_task_get_source(task));
  76     Error *err = NULL;
  77
  78     if (qio_task_propagate_error(task, &err)) {
  79         trace_migration_socket_outgoing_error(error_get_pretty(err));
  80         migrate_fd_error(data->s, err);
  81         error_free(err);
  82     } else {
  83         trace_migration_socket_outgoing_connected(data->hostname);
  84         migration_channel_connect(data->s, sioc, data->hostname);
  85     }
  86     object_unref(OBJECT(sioc));
  87 }
  88
  89 static void socket_start_outgoing_migration(MigrationState *s,
  90                                             SocketAddress *saddr,
  91                                             Error **errp)
  92 {
  93     QIOChannelSocket *sioc = qio_channel_socket_new();
  94     struct SocketConnectData *data = g_new0(struct SocketConnectData, 1);
  95
  96     data->s = s;
  97     if (saddr->type == SOCKET_ADDRESS_TYPE_INET) {
  98         data->hostname = g_strdup(saddr->u.inet.host);
  99     }
 100
 101     qio_channel_set_name(QIO_CHANNEL(sioc), "migration-socket-outgoing");
 102     qio_channel_socket_connect_async(sioc,
 103                                      saddr,
 104                                      socket_outgoing_migration,
 105                                      data,
 106                                      socket_connect_data_free);
 107     qapi_free_SocketAddress(saddr);
 108 }
 109
 110 void tcp_start_outgoing_migration(MigrationState *s,
 111                                   const char *host_port,
 112                                   Error **errp)
 113 {
 114     Error *err = NULL;
 115     SocketAddress *saddr = tcp_build_address(host_port, &err);
 116     if (!err) {
 117         socket_start_outgoing_migration(s, saddr, &err);
 118     }
 119     error_propagate(errp, err);
 120 }
 121
 122 void unix_start_outgoing_migration(MigrationState *s,
 123                                    const char *path,
 124                                    Error **errp)
 125 {
 126     SocketAddress *saddr = unix_build_address(path);
 127     socket_start_outgoing_migration(s, saddr, errp);
 128 }
 129
 130
 131 static gboolean socket_accept_incoming_migration(QIOChannel *ioc,
 132                                                  GIOCondition condition,
 133                                                  gpointer opaque)
 134 {
 135     QIOChannelSocket *sioc;
 136     Error *err = NULL;
 137
 138     sioc = qio_channel_socket_accept(QIO_CHANNEL_SOCKET(ioc),
 139                                      &err);
 140     if (!sioc) {
 141         error_report("could not accept migration connection (%s)",
 142                      error_get_pretty(err));
 143         goto out;
 144     }
 145
 146     trace_migration_socket_incoming_accepted();
 147
 148     qio_channel_set_name(QIO_CHANNEL(sioc), "migration-socket-incoming");
 149     migration_channel_process_incoming(migrate_get_current(),
 150                                        QIO_CHANNEL(sioc));
 151     object_unref(OBJECT(sioc));
 152
 153 out:
 154     /* Close listening socket as its no longer needed */
 155     qio_channel_close(ioc, NULL);
 156     return FALSE; /* unregister */
 157 }
 158
 159
 160 static void socket_start_incoming_migration(SocketAddress *saddr,
 161                                             Error **errp)
 162 {
 163     QIOChannelSocket *listen_ioc = qio_channel_socket_new();
 164
 165     qio_channel_set_name(QIO_CHANNEL(listen_ioc),
 166                          "migration-socket-listener");
 167
 168     if (qio_channel_socket_listen_sync(listen_ioc, saddr, errp) < 0) {
 169         object_unref(OBJECT(listen_ioc));
 170         qapi_free_SocketAddress(saddr);
 171         return;
 172     }
 173
 174     qio_channel_add_watch(QIO_CHANNEL(listen_ioc),
 175                           G_IO_IN,
 176                           socket_accept_incoming_migration,
 177                           listen_ioc,
 178                           (GDestroyNotify)object_unref);
 179     qapi_free_SocketAddress(saddr);
 180 }
 181
 182 void tcp_start_incoming_migration(const char *host_port, Error **errp)
 183 {
 184     Error *err = NULL;
 185     SocketAddress *saddr = tcp_build_address(host_port, &err);
 186     if (!err) {
 187         socket_start_incoming_migration(saddr, &err);
 188     }
 189     error_propagate(errp, err);
 190 }
 191
 192 void unix_start_incoming_migration(const char *path, Error **errp)
 193 {
 194     SocketAddress *saddr = unix_build_address(path);
 195     socket_start_incoming_migration(saddr, errp);
 196 }