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 "migration/migration.h" 23 #include "migration/qemu-file.h" 24 #include "io/channel-socket.h" 25 #include "trace.h" 26 27 28 static SocketAddress *tcp_build_address(const char *host_port, Error **errp) 29 { 30 InetSocketAddress *iaddr = inet_parse(host_port, errp); 31 SocketAddress *saddr; 32 33 if (!iaddr) { 34 return NULL; 35 } 36 37 saddr = g_new0(SocketAddress, 1); 38 saddr->type = SOCKET_ADDRESS_KIND_INET; 39 saddr->u.inet.data = iaddr; 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_KIND_UNIX; 51 saddr->u.q_unix.data = g_new0(UnixSocketAddress, 1); 52 saddr->u.q_unix.data->path = g_strdup(path); 53 54 return saddr; 55 } 56 57 58 struct SocketConnectData { 59 MigrationState *s; 60 char *hostname; 61 }; 62 63 static void socket_connect_data_free(void *opaque) 64 { 65 struct SocketConnectData *data = opaque; 66 if (!data) { 67 return; 68 } 69 g_free(data->hostname); 70 g_free(data); 71 } 72 73 static void socket_outgoing_migration(QIOTask *task, 74 gpointer opaque) 75 { 76 struct SocketConnectData *data = opaque; 77 QIOChannel *sioc = QIO_CHANNEL(qio_task_get_source(task)); 78 Error *err = NULL; 79 80 if (qio_task_propagate_error(task, &err)) { 81 trace_migration_socket_outgoing_error(error_get_pretty(err)); 82 data->s->to_dst_file = NULL; 83 migrate_fd_error(data->s, err); 84 error_free(err); 85 } else { 86 trace_migration_socket_outgoing_connected(data->hostname); 87 migration_channel_connect(data->s, sioc, data->hostname); 88 } 89 object_unref(OBJECT(sioc)); 90 } 91 92 static void socket_start_outgoing_migration(MigrationState *s, 93 SocketAddress *saddr, 94 Error **errp) 95 { 96 QIOChannelSocket *sioc = qio_channel_socket_new(); 97 struct SocketConnectData *data = g_new0(struct SocketConnectData, 1); 98 99 data->s = s; 100 if (saddr->type == SOCKET_ADDRESS_KIND_INET) { 101 data->hostname = g_strdup(saddr->u.inet.data->host); 102 } 103 104 qio_channel_set_name(QIO_CHANNEL(sioc), "migration-socket-outgoing"); 105 qio_channel_socket_connect_async(sioc, 106 saddr, 107 socket_outgoing_migration, 108 data, 109 socket_connect_data_free); 110 qapi_free_SocketAddress(saddr); 111 } 112 113 void tcp_start_outgoing_migration(MigrationState *s, 114 const char *host_port, 115 Error **errp) 116 { 117 Error *err = NULL; 118 SocketAddress *saddr = tcp_build_address(host_port, &err); 119 if (!err) { 120 socket_start_outgoing_migration(s, saddr, &err); 121 } 122 error_propagate(errp, err); 123 } 124 125 void unix_start_outgoing_migration(MigrationState *s, 126 const char *path, 127 Error **errp) 128 { 129 SocketAddress *saddr = unix_build_address(path); 130 socket_start_outgoing_migration(s, saddr, errp); 131 } 132 133 134 static gboolean socket_accept_incoming_migration(QIOChannel *ioc, 135 GIOCondition condition, 136 gpointer opaque) 137 { 138 QIOChannelSocket *sioc; 139 Error *err = NULL; 140 141 sioc = qio_channel_socket_accept(QIO_CHANNEL_SOCKET(ioc), 142 &err); 143 if (!sioc) { 144 error_report("could not accept migration connection (%s)", 145 error_get_pretty(err)); 146 goto out; 147 } 148 149 trace_migration_socket_incoming_accepted(); 150 151 qio_channel_set_name(QIO_CHANNEL(sioc), "migration-socket-incoming"); 152 migration_channel_process_incoming(migrate_get_current(), 153 QIO_CHANNEL(sioc)); 154 object_unref(OBJECT(sioc)); 155 156 out: 157 /* Close listening socket as its no longer needed */ 158 qio_channel_close(ioc, NULL); 159 return FALSE; /* unregister */ 160 } 161 162 163 static void socket_start_incoming_migration(SocketAddress *saddr, 164 Error **errp) 165 { 166 QIOChannelSocket *listen_ioc = qio_channel_socket_new(); 167 168 qio_channel_set_name(QIO_CHANNEL(listen_ioc), 169 "migration-socket-listener"); 170 171 if (qio_channel_socket_listen_sync(listen_ioc, saddr, errp) < 0) { 172 object_unref(OBJECT(listen_ioc)); 173 qapi_free_SocketAddress(saddr); 174 return; 175 } 176 177 qio_channel_add_watch(QIO_CHANNEL(listen_ioc), 178 G_IO_IN, 179 socket_accept_incoming_migration, 180 listen_ioc, 181 (GDestroyNotify)object_unref); 182 qapi_free_SocketAddress(saddr); 183 } 184 185 void tcp_start_incoming_migration(const char *host_port, Error **errp) 186 { 187 Error *err = NULL; 188 SocketAddress *saddr = tcp_build_address(host_port, &err); 189 if (!err) { 190 socket_start_incoming_migration(saddr, &err); 191 } 192 error_propagate(errp, err); 193 } 194 195 void unix_start_incoming_migration(const char *path, Error **errp) 196 { 197 SocketAddress *saddr = unix_build_address(path); 198 socket_start_incoming_migration(saddr, errp); 199 } 200