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 "migration/migration.h" 24 #include "migration/qemu-file.h" 25 #include "io/channel-socket.h" 26 #include "trace.h" 27 28 29 static SocketAddress *tcp_build_address(const char *host_port, Error **errp) 30 { 31 SocketAddress *saddr; 32 33 saddr = g_new0(SocketAddress, 1); 34 saddr->type = SOCKET_ADDRESS_TYPE_INET; 35 36 if (inet_parse(&saddr->u.inet, host_port, errp)) { 37 qapi_free_SocketAddress(saddr); 38 return NULL; 39 } 40 41 return saddr; 42 } 43 44 45 static SocketAddress *unix_build_address(const char *path) 46 { 47 SocketAddress *saddr; 48 49 saddr = g_new0(SocketAddress, 1); 50 saddr->type = SOCKET_ADDRESS_TYPE_UNIX; 51 saddr->u.q_unix.path = g_strdup(path); 52 53 return saddr; 54 } 55 56 57 struct SocketConnectData { 58 MigrationState *s; 59 char *hostname; 60 }; 61 62 static void socket_connect_data_free(void *opaque) 63 { 64 struct SocketConnectData *data = opaque; 65 if (!data) { 66 return; 67 } 68 g_free(data->hostname); 69 g_free(data); 70 } 71 72 static void socket_outgoing_migration(QIOTask *task, 73 gpointer opaque) 74 { 75 struct SocketConnectData *data = opaque; 76 QIOChannel *sioc = QIO_CHANNEL(qio_task_get_source(task)); 77 Error *err = NULL; 78 79 if (qio_task_propagate_error(task, &err)) { 80 trace_migration_socket_outgoing_error(error_get_pretty(err)); 81 migrate_fd_error(data->s, err); 82 error_free(err); 83 } else { 84 trace_migration_socket_outgoing_connected(data->hostname); 85 migration_channel_connect(data->s, sioc, data->hostname); 86 } 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 qapi_free_SocketAddress(saddr); 109 } 110 111 void tcp_start_outgoing_migration(MigrationState *s, 112 const char *host_port, 113 Error **errp) 114 { 115 Error *err = NULL; 116 SocketAddress *saddr = tcp_build_address(host_port, &err); 117 if (!err) { 118 socket_start_outgoing_migration(s, saddr, &err); 119 } 120 error_propagate(errp, err); 121 } 122 123 void unix_start_outgoing_migration(MigrationState *s, 124 const char *path, 125 Error **errp) 126 { 127 SocketAddress *saddr = unix_build_address(path); 128 socket_start_outgoing_migration(s, saddr, errp); 129 } 130 131 132 static gboolean socket_accept_incoming_migration(QIOChannel *ioc, 133 GIOCondition condition, 134 gpointer opaque) 135 { 136 QIOChannelSocket *sioc; 137 Error *err = NULL; 138 139 sioc = qio_channel_socket_accept(QIO_CHANNEL_SOCKET(ioc), 140 &err); 141 if (!sioc) { 142 error_report("could not accept migration connection (%s)", 143 error_get_pretty(err)); 144 goto out; 145 } 146 147 trace_migration_socket_incoming_accepted(); 148 149 qio_channel_set_name(QIO_CHANNEL(sioc), "migration-socket-incoming"); 150 migration_channel_process_incoming(migrate_get_current(), 151 QIO_CHANNEL(sioc)); 152 object_unref(OBJECT(sioc)); 153 154 out: 155 /* Close listening socket as its no longer needed */ 156 qio_channel_close(ioc, NULL); 157 return FALSE; /* unregister */ 158 } 159 160 161 static void socket_start_incoming_migration(SocketAddress *saddr, 162 Error **errp) 163 { 164 QIOChannelSocket *listen_ioc = qio_channel_socket_new(); 165 166 qio_channel_set_name(QIO_CHANNEL(listen_ioc), 167 "migration-socket-listener"); 168 169 if (qio_channel_socket_listen_sync(listen_ioc, saddr, errp) < 0) { 170 object_unref(OBJECT(listen_ioc)); 171 qapi_free_SocketAddress(saddr); 172 return; 173 } 174 175 qio_channel_add_watch(QIO_CHANNEL(listen_ioc), 176 G_IO_IN, 177 socket_accept_incoming_migration, 178 listen_ioc, 179 (GDestroyNotify)object_unref); 180 qapi_free_SocketAddress(saddr); 181 } 182 183 void tcp_start_incoming_migration(const char *host_port, Error **errp) 184 { 185 Error *err = NULL; 186 SocketAddress *saddr = tcp_build_address(host_port, &err); 187 if (!err) { 188 socket_start_incoming_migration(saddr, &err); 189 } 190 error_propagate(errp, err); 191 } 192 193 void unix_start_incoming_migration(const char *path, Error **errp) 194 { 195 SocketAddress *saddr = unix_build_address(path); 196 socket_start_incoming_migration(saddr, errp); 197 } 198