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 #include "yank_functions.h"
  24
  25 /**
  26  * @migration_channel_process_incoming - Create new incoming migration channel
  27  *
  28  * Notice that TLS is special.  For it we listen in a listener socket,
  29  * and then create a new client socket from the TLS library.
  30  *
  31  * @ioc: Channel to which we are connecting
  32  */
  33 void migration_channel_process_incoming(QIOChannel *ioc)
  34 {
  35     MigrationState *s = migrate_get_current();
  36     Error *local_err = NULL;
  37
  38     trace_migration_set_incoming_channel(
  39         ioc, object_get_typename(OBJECT(ioc)));
  40
  41     if (object_dynamic_cast(OBJECT(ioc), TYPE_QIO_CHANNEL_SOCKET)) {
  42         yank_register_function(MIGRATION_YANK_INSTANCE,
  43                                migration_yank_iochannel,
  44                                QIO_CHANNEL(ioc));
  45     }
  46
  47     if (s->parameters.tls_creds &&
  48         *s->parameters.tls_creds &&
  49         !object_dynamic_cast(OBJECT(ioc),
  50                              TYPE_QIO_CHANNEL_TLS)) {
  51         migration_tls_channel_process_incoming(s, ioc, &local_err);
  52     } else {
  53         migration_ioc_process_incoming(ioc, &local_err);
  54     }
  55
  56     if (local_err) {
  57         error_report_err(local_err);
  58     }
  59 }
  60
  61
  62 /**
  63  * @migration_channel_connect - Create new outgoing migration channel
  64  *
  65  * @s: Current migration state
  66  * @ioc: Channel to which we are connecting
  67  * @hostname: Where we want to connect
  68  * @error: Error indicating failure to connect, free'd here
  69  */
  70 void migration_channel_connect(MigrationState *s,
  71                                QIOChannel *ioc,
  72                                const char *hostname,
  73                                Error *error)
  74 {
  75     trace_migration_set_outgoing_channel(
  76         ioc, object_get_typename(OBJECT(ioc)), hostname, error);
  77
  78     if (!error) {
  79         if (object_dynamic_cast(OBJECT(ioc), TYPE_QIO_CHANNEL_SOCKET)) {
  80             yank_register_function(MIGRATION_YANK_INSTANCE,
  81                                    migration_yank_iochannel,
  82                                    QIO_CHANNEL(ioc));
  83         }
  84
  85         if (s->parameters.tls_creds &&
  86             *s->parameters.tls_creds &&
  87             !object_dynamic_cast(OBJECT(ioc),
  88                                  TYPE_QIO_CHANNEL_TLS)) {
  89             migration_tls_channel_connect(s, ioc, hostname, &error);
  90
  91             if (!error) {
  92                 /* tls_channel_connect will call back to this
  93                  * function after the TLS handshake,
  94                  * so we mustn't call migrate_fd_connect until then
  95                  */
  96
  97                 return;
  98             }
  99         } else {
 100             QEMUFile *f = qemu_fopen_channel_output(ioc);
 101
 102             qemu_mutex_lock(&s->qemu_file_lock);
 103             s->to_dst_file = f;
 104             qemu_mutex_unlock(&s->qemu_file_lock);
 105         }
 106     }
 107     migrate_fd_connect(s, error);
 108     g_free(s->hostname);
 109     error_free(error);
 110 }