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 (s->parameters.tls_creds && 42 *s->parameters.tls_creds && 43 !object_dynamic_cast(OBJECT(ioc), 44 TYPE_QIO_CHANNEL_TLS)) { 45 migration_tls_channel_process_incoming(s, ioc, &local_err); 46 } else { 47 if (object_dynamic_cast(OBJECT(ioc), TYPE_QIO_CHANNEL_SOCKET) || 48 object_dynamic_cast(OBJECT(ioc), TYPE_QIO_CHANNEL_TLS)) { 49 yank_register_function(MIGRATION_YANK_INSTANCE, 50 migration_yank_iochannel, 51 QIO_CHANNEL(ioc)); 52 } 53 54 migration_ioc_process_incoming(ioc, &local_err); 55 } 56 57 if (local_err) { 58 error_report_err(local_err); 59 } 60 } 61 62 63 /** 64 * @migration_channel_connect - Create new outgoing migration channel 65 * 66 * @s: Current migration state 67 * @ioc: Channel to which we are connecting 68 * @hostname: Where we want to connect 69 * @error: Error indicating failure to connect, free'd here 70 */ 71 void migration_channel_connect(MigrationState *s, 72 QIOChannel *ioc, 73 const char *hostname, 74 Error *error) 75 { 76 trace_migration_set_outgoing_channel( 77 ioc, object_get_typename(OBJECT(ioc)), hostname, error); 78 79 if (!error) { 80 if (s->parameters.tls_creds && 81 *s->parameters.tls_creds && 82 !object_dynamic_cast(OBJECT(ioc), 83 TYPE_QIO_CHANNEL_TLS)) { 84 migration_tls_channel_connect(s, ioc, hostname, &error); 85 86 if (!error) { 87 /* tls_channel_connect will call back to this 88 * function after the TLS handshake, 89 * so we mustn't call migrate_fd_connect until then 90 */ 91 92 return; 93 } 94 } else { 95 QEMUFile *f = qemu_fopen_channel_output(ioc); 96 97 if (object_dynamic_cast(OBJECT(ioc), TYPE_QIO_CHANNEL_SOCKET) || 98 object_dynamic_cast(OBJECT(ioc), TYPE_QIO_CHANNEL_TLS)) { 99 yank_register_function(MIGRATION_YANK_INSTANCE, 100 migration_yank_iochannel, 101 QIO_CHANNEL(ioc)); 102 } 103 104 qemu_mutex_lock(&s->qemu_file_lock); 105 s->to_dst_file = f; 106 qemu_mutex_unlock(&s->qemu_file_lock); 107 } 108 } 109 migrate_fd_connect(s, error); 110 g_free(s->hostname); 111 error_free(error); 112 } 113