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     InetSocketAddress *iaddr = inet_parse(host_port, errp);
  31     SocketAddress *saddr;
  32
  33     if (!iaddr) {
  34         return NULL;
  35     }
  36
  37     saddr = g_new0(SocketAddress, 1);
  38     saddr->type = SOCKET_ADDRESS_KIND_INET;
  39     saddr->u.inet.data = iaddr;
  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_KIND_UNIX;
  51     saddr->u.q_unix.data = g_new0(UnixSocketAddress, 1);
  52     saddr->u.q_unix.data->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         data->s->to_dst_file = NULL;
  83         migrate_fd_error(data->s, err);
  84         error_free(err);
  85     } else {
  86         trace_migration_socket_outgoing_connected(data->hostname);
  87         migration_channel_connect(data->s, sioc, data->hostname);
  88     }
  89     object_unref(OBJECT(sioc));
  90 }
  91
  92 static void socket_start_outgoing_migration(MigrationState *s,
  93                                             SocketAddress *saddr,
  94                                             Error **errp)
  95 {
  96     QIOChannelSocket *sioc = qio_channel_socket_new();
  97     struct SocketConnectData *data = g_new0(struct SocketConnectData, 1);
  98
  99     data->s = s;
 100     if (saddr->type == SOCKET_ADDRESS_KIND_INET) {
 101         data->hostname = g_strdup(saddr->u.inet.data->host);
 102     }
 103
 104     qio_channel_set_name(QIO_CHANNEL(sioc), "migration-socket-outgoing");
 105     qio_channel_socket_connect_async(sioc,
 106                                      saddr,
 107                                      socket_outgoing_migration,
 108                                      data,
 109                                      socket_connect_data_free);
 110     qapi_free_SocketAddress(saddr);
 111 }
 112
 113 void tcp_start_outgoing_migration(MigrationState *s,
 114                                   const char *host_port,
 115                                   Error **errp)
 116 {
 117     Error *err = NULL;
 118     SocketAddress *saddr = tcp_build_address(host_port, &err);
 119     if (!err) {
 120         socket_start_outgoing_migration(s, saddr, &err);
 121     }
 122     error_propagate(errp, err);
 123 }
 124
 125 void unix_start_outgoing_migration(MigrationState *s,
 126                                    const char *path,
 127                                    Error **errp)
 128 {
 129     SocketAddress *saddr = unix_build_address(path);
 130     socket_start_outgoing_migration(s, saddr, errp);
 131 }
 132
 133
 134 static gboolean socket_accept_incoming_migration(QIOChannel *ioc,
 135                                                  GIOCondition condition,
 136                                                  gpointer opaque)
 137 {
 138     QIOChannelSocket *sioc;
 139     Error *err = NULL;
 140
 141     sioc = qio_channel_socket_accept(QIO_CHANNEL_SOCKET(ioc),
 142                                      &err);
 143     if (!sioc) {
 144         error_report("could not accept migration connection (%s)",
 145                      error_get_pretty(err));
 146         goto out;
 147     }
 148
 149     trace_migration_socket_incoming_accepted();
 150
 151     qio_channel_set_name(QIO_CHANNEL(sioc), "migration-socket-incoming");
 152     migration_channel_process_incoming(migrate_get_current(),
 153                                        QIO_CHANNEL(sioc));
 154     object_unref(OBJECT(sioc));
 155
 156 out:
 157     /* Close listening socket as its no longer needed */
 158     qio_channel_close(ioc, NULL);
 159     return FALSE; /* unregister */
 160 }
 161
 162
 163 static void socket_start_incoming_migration(SocketAddress *saddr,
 164                                             Error **errp)
 165 {
 166     QIOChannelSocket *listen_ioc = qio_channel_socket_new();
 167
 168     qio_channel_set_name(QIO_CHANNEL(listen_ioc),
 169                          "migration-socket-listener");
 170
 171     if (qio_channel_socket_listen_sync(listen_ioc, saddr, errp) < 0) {
 172         object_unref(OBJECT(listen_ioc));
 173         qapi_free_SocketAddress(saddr);
 174         return;
 175     }
 176
 177     qio_channel_add_watch(QIO_CHANNEL(listen_ioc),
 178                           G_IO_IN,
 179                           socket_accept_incoming_migration,
 180                           listen_ioc,
 181                           (GDestroyNotify)object_unref);
 182     qapi_free_SocketAddress(saddr);
 183 }
 184
 185 void tcp_start_incoming_migration(const char *host_port, Error **errp)
 186 {
 187     Error *err = NULL;
 188     SocketAddress *saddr = tcp_build_address(host_port, &err);
 189     if (!err) {
 190         socket_start_incoming_migration(saddr, &err);
 191     }
 192     error_propagate(errp, err);
 193 }
 194
 195 void unix_start_incoming_migration(const char *path, Error **errp)
 196 {
 197     SocketAddress *saddr = unix_build_address(path);
 198     socket_start_incoming_migration(saddr, errp);
 199 }