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 "io/net-listener.h"
  28 #include "trace.h"
  29
  30
  31 static SocketAddress *tcp_build_address(const char *host_port, Error **errp)
  32 {
  33     SocketAddress *saddr;
  34
  35     saddr = g_new0(SocketAddress, 1);
  36     saddr->type = SOCKET_ADDRESS_TYPE_INET;
  37
  38     if (inet_parse(&saddr->u.inet, host_port, errp)) {
  39         qapi_free_SocketAddress(saddr);
  40         return NULL;
  41     }
  42
  43     return saddr;
  44 }
  45
  46
  47 static SocketAddress *unix_build_address(const char *path)
  48 {
  49     SocketAddress *saddr;
  50
  51     saddr = g_new0(SocketAddress, 1);
  52     saddr->type = SOCKET_ADDRESS_TYPE_UNIX;
  53     saddr->u.q_unix.path = g_strdup(path);
  54
  55     return saddr;
  56 }
  57
  58
  59 struct SocketConnectData {
  60     MigrationState *s;
  61     char *hostname;
  62 };
  63
  64 static void socket_connect_data_free(void *opaque)
  65 {
  66     struct SocketConnectData *data = opaque;
  67     if (!data) {
  68         return;
  69     }
  70     g_free(data->hostname);
  71     g_free(data);
  72 }
  73
  74 static void socket_outgoing_migration(QIOTask *task,
  75                                       gpointer opaque)
  76 {
  77     struct SocketConnectData *data = opaque;
  78     QIOChannel *sioc = QIO_CHANNEL(qio_task_get_source(task));
  79     Error *err = NULL;
  80
  81     if (qio_task_propagate_error(task, &err)) {
  82         trace_migration_socket_outgoing_error(error_get_pretty(err));
  83     } else {
  84         trace_migration_socket_outgoing_connected(data->hostname);
  85     }
  86     migration_channel_connect(data->s, sioc, data->hostname, err);
  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                                      NULL);
 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 void socket_accept_incoming_migration(QIONetListener *listener,
 134                                              QIOChannelSocket *cioc,
 135                                              gpointer opaque)
 136 {
 137     trace_migration_socket_incoming_accepted();
 138
 139     qio_channel_set_name(QIO_CHANNEL(cioc), "migration-socket-incoming");
 140     migration_channel_process_incoming(QIO_CHANNEL(cioc));
 141
 142     if (migration_has_all_channels()) {
 143         /* Close listening socket as its no longer needed */
 144         qio_net_listener_disconnect(listener);
 145
 146         object_unref(OBJECT(listener));
 147     }
 148 }
 149
 150
 151 static void socket_start_incoming_migration(SocketAddress *saddr,
 152                                             Error **errp)
 153 {
 154     QIONetListener *listener = qio_net_listener_new();
 155
 156     qio_net_listener_set_name(listener, "migration-socket-listener");
 157
 158     if (qio_net_listener_open_sync(listener, saddr, errp) < 0) {
 159         object_unref(OBJECT(listener));
 160         return;
 161     }
 162
 163     qio_net_listener_set_client_func(listener,
 164                                      socket_accept_incoming_migration,
 165                                      NULL, NULL);
 166 }
 167
 168 void tcp_start_incoming_migration(const char *host_port, Error **errp)
 169 {
 170     Error *err = NULL;
 171     SocketAddress *saddr = tcp_build_address(host_port, &err);
 172     if (!err) {
 173         socket_start_incoming_migration(saddr, &err);
 174     }
 175     qapi_free_SocketAddress(saddr);
 176     error_propagate(errp, err);
 177 }
 178
 179 void unix_start_incoming_migration(const char *path, Error **errp)
 180 {
 181     SocketAddress *saddr = unix_build_address(path);
 182     socket_start_incoming_migration(saddr, errp);
 183     qapi_free_SocketAddress(saddr);
 184 }