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 "channel.h" 23 #include "socket.h" 24 #include "migration.h" 25 #include "qemu-file.h" 26 #include "io/channel-socket.h" 27 #include "io/net-listener.h" 28 #include "trace.h" 29 30 31 static SocketAddress *tcp_build_address(const char *host_port, Error **errp) 32 { 33 SocketAddress *saddr; 34 35 saddr = g_new0(SocketAddress, 1); 36 saddr->type = SOCKET_ADDRESS_TYPE_INET; 37 38 if (inet_parse(&saddr->u.inet, host_port, errp)) { 39 qapi_free_SocketAddress(saddr); 40 return NULL; 41 } 42 43 return saddr; 44 } 45 46 47 static SocketAddress *unix_build_address(const char *path) 48 { 49 SocketAddress *saddr; 50 51 saddr = g_new0(SocketAddress, 1); 52 saddr->type = SOCKET_ADDRESS_TYPE_UNIX; 53 saddr->u.q_unix.path = g_strdup(path); 54 55 return saddr; 56 } 57 58 59 struct SocketConnectData { 60 MigrationState *s; 61 char *hostname; 62 }; 63 64 static void socket_connect_data_free(void *opaque) 65 { 66 struct SocketConnectData *data = opaque; 67 if (!data) { 68 return; 69 } 70 g_free(data->hostname); 71 g_free(data); 72 } 73 74 static void socket_outgoing_migration(QIOTask *task, 75 gpointer opaque) 76 { 77 struct SocketConnectData *data = opaque; 78 QIOChannel *sioc = QIO_CHANNEL(qio_task_get_source(task)); 79 Error *err = NULL; 80 81 if (qio_task_propagate_error(task, &err)) { 82 trace_migration_socket_outgoing_error(error_get_pretty(err)); 83 } else { 84 trace_migration_socket_outgoing_connected(data->hostname); 85 } 86 migration_channel_connect(data->s, sioc, data->hostname, err); 87 object_unref(OBJECT(sioc)); 88 } 89 90 static void socket_start_outgoing_migration(MigrationState *s, 91 SocketAddress *saddr, 92 Error **errp) 93 { 94 QIOChannelSocket *sioc = qio_channel_socket_new(); 95 struct SocketConnectData *data = g_new0(struct SocketConnectData, 1); 96 97 data->s = s; 98 if (saddr->type == SOCKET_ADDRESS_TYPE_INET) { 99 data->hostname = g_strdup(saddr->u.inet.host); 100 } 101 102 qio_channel_set_name(QIO_CHANNEL(sioc), "migration-socket-outgoing"); 103 qio_channel_socket_connect_async(sioc, 104 saddr, 105 socket_outgoing_migration, 106 data, 107 socket_connect_data_free, 108 NULL); 109 qapi_free_SocketAddress(saddr); 110 } 111 112 void tcp_start_outgoing_migration(MigrationState *s, 113 const char *host_port, 114 Error **errp) 115 { 116 Error *err = NULL; 117 SocketAddress *saddr = tcp_build_address(host_port, &err); 118 if (!err) { 119 socket_start_outgoing_migration(s, saddr, &err); 120 } 121 error_propagate(errp, err); 122 } 123 124 void unix_start_outgoing_migration(MigrationState *s, 125 const char *path, 126 Error **errp) 127 { 128 SocketAddress *saddr = unix_build_address(path); 129 socket_start_outgoing_migration(s, saddr, errp); 130 } 131 132 133 static void socket_accept_incoming_migration(QIONetListener *listener, 134 QIOChannelSocket *cioc, 135 gpointer opaque) 136 { 137 trace_migration_socket_incoming_accepted(); 138 139 qio_channel_set_name(QIO_CHANNEL(cioc), "migration-socket-incoming"); 140 migration_channel_process_incoming(QIO_CHANNEL(cioc)); 141 142 if (migration_has_all_channels()) { 143 /* Close listening socket as its no longer needed */ 144 qio_net_listener_disconnect(listener); 145 146 object_unref(OBJECT(listener)); 147 } 148 } 149 150 151 static void socket_start_incoming_migration(SocketAddress *saddr, 152 Error **errp) 153 { 154 QIONetListener *listener = qio_net_listener_new(); 155 156 qio_net_listener_set_name(listener, "migration-socket-listener"); 157 158 if (qio_net_listener_open_sync(listener, saddr, errp) < 0) { 159 object_unref(OBJECT(listener)); 160 return; 161 } 162 163 qio_net_listener_set_client_func(listener, 164 socket_accept_incoming_migration, 165 NULL, NULL); 166 } 167 168 void tcp_start_incoming_migration(const char *host_port, Error **errp) 169 { 170 Error *err = NULL; 171 SocketAddress *saddr = tcp_build_address(host_port, &err); 172 if (!err) { 173 socket_start_incoming_migration(saddr, &err); 174 } 175 qapi_free_SocketAddress(saddr); 176 error_propagate(errp, err); 177 } 178 179 void unix_start_incoming_migration(const char *path, Error **errp) 180 { 181 SocketAddress *saddr = unix_build_address(path); 182 socket_start_incoming_migration(saddr, errp); 183 qapi_free_SocketAddress(saddr); 184 } 185