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 static SocketAddress *tcp_build_address(const char *host_port, Error **errp)
  54 {
  55     SocketAddress *saddr;
  56
  57     saddr = g_new0(SocketAddress, 1);
  58     saddr->type = SOCKET_ADDRESS_TYPE_INET;
  59
  60     if (inet_parse(&saddr->u.inet, host_port, errp)) {
  61         qapi_free_SocketAddress(saddr);
  62         return NULL;
  63     }
  64
  65     return saddr;
  66 }
  67
  68
  69 static SocketAddress *unix_build_address(const char *path)
  70 {
  71     SocketAddress *saddr;
  72
  73     saddr = g_new0(SocketAddress, 1);
  74     saddr->type = SOCKET_ADDRESS_TYPE_UNIX;
  75     saddr->u.q_unix.path = g_strdup(path);
  76
  77     return saddr;
  78 }
  79
  80
  81 struct SocketConnectData {
  82     MigrationState *s;
  83     char *hostname;
  84 };
  85
  86 static void socket_connect_data_free(void *opaque)
  87 {
  88     struct SocketConnectData *data = opaque;
  89     if (!data) {
  90         return;
  91     }
  92     g_free(data->hostname);
  93     g_free(data);
  94 }
  95
  96 static void socket_outgoing_migration(QIOTask *task,
  97                                       gpointer opaque)
  98 {
  99     struct SocketConnectData *data = opaque;
 100     QIOChannel *sioc = QIO_CHANNEL(qio_task_get_source(task));
 101     Error *err = NULL;
 102
 103     if (qio_task_propagate_error(task, &err)) {
 104         trace_migration_socket_outgoing_error(error_get_pretty(err));
 105     } else {
 106         trace_migration_socket_outgoing_connected(data->hostname);
 107     }
 108     migration_channel_connect(data->s, sioc, data->hostname, err);
 109     object_unref(OBJECT(sioc));
 110 }
 111
 112 static void socket_start_outgoing_migration(MigrationState *s,
 113                                             SocketAddress *saddr,
 114                                             Error **errp)
 115 {
 116     QIOChannelSocket *sioc = qio_channel_socket_new();
 117     struct SocketConnectData *data = g_new0(struct SocketConnectData, 1);
 118
 119     data->s = s;
 120
 121     /* in case previous migration leaked it */
 122     qapi_free_SocketAddress(outgoing_args.saddr);
 123     outgoing_args.saddr = saddr;
 124
 125     if (saddr->type == SOCKET_ADDRESS_TYPE_INET) {
 126         data->hostname = g_strdup(saddr->u.inet.host);
 127     }
 128
 129     qio_channel_set_name(QIO_CHANNEL(sioc), "migration-socket-outgoing");
 130     qio_channel_socket_connect_async(sioc,
 131                                      saddr,
 132                                      socket_outgoing_migration,
 133                                      data,
 134                                      socket_connect_data_free,
 135                                      NULL);
 136 }
 137
 138 void tcp_start_outgoing_migration(MigrationState *s,
 139                                   const char *host_port,
 140                                   Error **errp)
 141 {
 142     Error *err = NULL;
 143     SocketAddress *saddr = tcp_build_address(host_port, &err);
 144     if (!err) {
 145         socket_start_outgoing_migration(s, saddr, &err);
 146     }
 147     error_propagate(errp, err);
 148 }
 149
 150 void unix_start_outgoing_migration(MigrationState *s,
 151                                    const char *path,
 152                                    Error **errp)
 153 {
 154     SocketAddress *saddr = unix_build_address(path);
 155     socket_start_outgoing_migration(s, saddr, errp);
 156 }
 157
 158
 159 static void socket_accept_incoming_migration(QIONetListener *listener,
 160                                              QIOChannelSocket *cioc,
 161                                              gpointer opaque)
 162 {
 163     trace_migration_socket_incoming_accepted();
 164
 165     qio_channel_set_name(QIO_CHANNEL(cioc), "migration-socket-incoming");
 166     migration_channel_process_incoming(QIO_CHANNEL(cioc));
 167
 168     if (migration_has_all_channels()) {
 169         /* Close listening socket as its no longer needed */
 170         qio_net_listener_disconnect(listener);
 171         object_unref(OBJECT(listener));
 172     }
 173 }
 174
 175
 176 static void socket_start_incoming_migration(SocketAddress *saddr,
 177                                             Error **errp)
 178 {
 179     QIONetListener *listener = qio_net_listener_new();
 180     size_t i;
 181     int num = 1;
 182
 183     qio_net_listener_set_name(listener, "migration-socket-listener");
 184
 185     if (migrate_use_multifd()) {
 186         num = migrate_multifd_channels();
 187     }
 188
 189     if (qio_net_listener_open_sync(listener, saddr, num, errp) < 0) {
 190         object_unref(OBJECT(listener));
 191         return;
 192     }
 193
 194     qio_net_listener_set_client_func_full(listener,
 195                                           socket_accept_incoming_migration,
 196                                           NULL, NULL,
 197                                           g_main_context_get_thread_default());
 198
 199     for (i = 0; i < listener->nsioc; i++)  {
 200         SocketAddress *address =
 201             qio_channel_socket_get_local_address(listener->sioc[i], errp);
 202         if (!address) {
 203             return;
 204         }
 205         migrate_add_address(address);
 206         qapi_free_SocketAddress(address);
 207     }
 208 }
 209
 210 void tcp_start_incoming_migration(const char *host_port, Error **errp)
 211 {
 212     Error *err = NULL;
 213     SocketAddress *saddr = tcp_build_address(host_port, &err);
 214     if (!err) {
 215         socket_start_incoming_migration(saddr, &err);
 216     }
 217     qapi_free_SocketAddress(saddr);
 218     error_propagate(errp, err);
 219 }
 220
 221 void unix_start_incoming_migration(const char *path, Error **errp)
 222 {
 223     SocketAddress *saddr = unix_build_address(path);
 224     socket_start_incoming_migration(saddr, errp);
 225     qapi_free_SocketAddress(saddr);
 226 }