migration/channel.c

   1 /*
   2  * QEMU live migration channel operations
   3  *
   4  * Copyright Red Hat, Inc. 2016
   5  *
   6  * Authors:
   7  *  Daniel P. Berrange <berrange@redhat.com>
   8  *
   9  * Contributions after 2012-01-13 are licensed under the terms of the
  10  * GNU GPL, version 2 or (at your option) any later version.
  11  */
  12
  13 #include "qemu/osdep.h"
  14 #include "channel.h"
  15 #include "tls.h"
  16 #include "migration.h"
  17 #include "qemu-file-channel.h"
  18 #include "trace.h"
  19 #include "qapi/error.h"
  20 #include "io/channel-tls.h"
  21 #include "io/channel-socket.h"
  22 #include "qemu/yank.h"
  23
  24 /**
  25  * @migration_channel_process_incoming - Create new incoming migration channel
  26  *
  27  * Notice that TLS is special.  For it we listen in a listener socket,
  28  * and then create a new client socket from the TLS library.
  29  *
  30  * @ioc: Channel to which we are connecting
  31  */
  32 void migration_channel_process_incoming(QIOChannel *ioc)
  33 {
  34     MigrationState *s = migrate_get_current();
  35     Error *local_err = NULL;
  36
  37     trace_migration_set_incoming_channel(
  38         ioc, object_get_typename(OBJECT(ioc)));
  39
  40     if (object_dynamic_cast(OBJECT(ioc), TYPE_QIO_CHANNEL_SOCKET)) {
  41         yank_register_function(MIGRATION_YANK_INSTANCE, yank_generic_iochannel,
  42                                QIO_CHANNEL(ioc));
  43     }
  44
  45     if (s->parameters.tls_creds &&
  46         *s->parameters.tls_creds &&
  47         !object_dynamic_cast(OBJECT(ioc),
  48                              TYPE_QIO_CHANNEL_TLS)) {
  49         migration_tls_channel_process_incoming(s, ioc, &local_err);
  50     } else {
  51         migration_ioc_process_incoming(ioc, &local_err);
  52     }
  53
  54     if (local_err) {
  55         error_report_err(local_err);
  56     }
  57 }
  58
  59
  60 /**
  61  * @migration_channel_connect - Create new outgoing migration channel
  62  *
  63  * @s: Current migration state
  64  * @ioc: Channel to which we are connecting
  65  * @hostname: Where we want to connect
  66  * @error: Error indicating failure to connect, free'd here
  67  */
  68 void migration_channel_connect(MigrationState *s,
  69                                QIOChannel *ioc,
  70                                const char *hostname,
  71                                Error *error)
  72 {
  73     trace_migration_set_outgoing_channel(
  74         ioc, object_get_typename(OBJECT(ioc)), hostname, error);
  75
  76     if (!error) {
  77         if (object_dynamic_cast(OBJECT(ioc), TYPE_QIO_CHANNEL_SOCKET)) {
  78             yank_register_function(MIGRATION_YANK_INSTANCE,
  79                                    yank_generic_iochannel,
  80                                    QIO_CHANNEL(ioc));
  81         }
  82
  83         if (s->parameters.tls_creds &&
  84             *s->parameters.tls_creds &&
  85             !object_dynamic_cast(OBJECT(ioc),
  86                                  TYPE_QIO_CHANNEL_TLS)) {
  87             migration_tls_channel_connect(s, ioc, hostname, &error);
  88
  89             if (!error) {
  90                 /* tls_channel_connect will call back to this
  91                  * function after the TLS handshake,
  92                  * so we mustn't call migrate_fd_connect until then
  93                  */
  94
  95                 return;
  96             }
  97         } else {
  98             QEMUFile *f = qemu_fopen_channel_output(ioc);
  99
 100             qemu_mutex_lock(&s->qemu_file_lock);
 101             s->to_dst_file = f;
 102             qemu_mutex_unlock(&s->qemu_file_lock);
 103         }
 104     }
 105     migrate_fd_connect(s, error);
 106     g_free(s->hostname);
 107     error_free(error);
 108 }