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 "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     if (migration_has_all_channels()) {
 156         /* Close listening socket as its no longer needed */
 157         qio_channel_close(ioc, NULL);
 158         return G_SOURCE_REMOVE;
 159     } else {
 160         return G_SOURCE_CONTINUE;
 161     }
 162 }
 163
 164
 165 static void socket_start_incoming_migration(SocketAddress *saddr,
 166                                             Error **errp)
 167 {
 168     QIOChannelSocket *listen_ioc = qio_channel_socket_new();
 169
 170     qio_channel_set_name(QIO_CHANNEL(listen_ioc),
 171                          "migration-socket-listener");
 172
 173     if (qio_channel_socket_listen_sync(listen_ioc, saddr, errp) < 0) {
 174         object_unref(OBJECT(listen_ioc));
 175         qapi_free_SocketAddress(saddr);
 176         return;
 177     }
 178
 179     qio_channel_add_watch(QIO_CHANNEL(listen_ioc),
 180                           G_IO_IN,
 181                           socket_accept_incoming_migration,
 182                           listen_ioc,
 183                           (GDestroyNotify)object_unref);
 184     qapi_free_SocketAddress(saddr);
 185 }
 186
 187 void tcp_start_incoming_migration(const char *host_port, Error **errp)
 188 {
 189     Error *err = NULL;
 190     SocketAddress *saddr = tcp_build_address(host_port, &err);
 191     if (!err) {
 192         socket_start_incoming_migration(saddr, &err);
 193     }
 194     error_propagate(errp, err);
 195 }
 196
 197 void unix_start_incoming_migration(const char *path, Error **errp)
 198 {
 199     SocketAddress *saddr = unix_build_address(path);
 200     socket_start_incoming_migration(saddr, errp);
 201 }