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 } 109