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 "trace.h" 28 29 30 static SocketAddress *tcp_build_address(const char *host_port, Error **errp) 31 { 32 SocketAddress *saddr; 33 34 saddr = g_new0(SocketAddress, 1); 35 saddr->type = SOCKET_ADDRESS_TYPE_INET; 36 37 if (inet_parse(&saddr->u.inet, host_port, errp)) { 38 qapi_free_SocketAddress(saddr); 39 return NULL; 40 } 41 42 return saddr; 43 } 44 45 46 static SocketAddress *unix_build_address(const char *path) 47 { 48 SocketAddress *saddr; 49 50 saddr = g_new0(SocketAddress, 1); 51 saddr->type = SOCKET_ADDRESS_TYPE_UNIX; 52 saddr->u.q_unix.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 migrate_fd_error(data->s, err); 83 error_free(err); 84 } else { 85 trace_migration_socket_outgoing_connected(data->hostname); 86 migration_channel_connect(data->s, sioc, data->hostname); 87 } 88 object_unref(OBJECT(sioc)); 89 } 90 91 static void socket_start_outgoing_migration(MigrationState *s, 92 SocketAddress *saddr, 93 Error **errp) 94 { 95 QIOChannelSocket *sioc = qio_channel_socket_new(); 96 struct SocketConnectData *data = g_new0(struct SocketConnectData, 1); 97 98 data->s = s; 99 if (saddr->type == SOCKET_ADDRESS_TYPE_INET) { 100 data->hostname = g_strdup(saddr->u.inet.host); 101 } 102 103 qio_channel_set_name(QIO_CHANNEL(sioc), "migration-socket-outgoing"); 104 qio_channel_socket_connect_async(sioc, 105 saddr, 106 socket_outgoing_migration, 107 data, 108 socket_connect_data_free); 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 gboolean socket_accept_incoming_migration(QIOChannel *ioc, 134 GIOCondition condition, 135 gpointer opaque) 136 { 137 QIOChannelSocket *sioc; 138 Error *err = NULL; 139 140 sioc = qio_channel_socket_accept(QIO_CHANNEL_SOCKET(ioc), 141 &err); 142 if (!sioc) { 143 error_report("could not accept migration connection (%s)", 144 error_get_pretty(err)); 145 goto out; 146 } 147 148 trace_migration_socket_incoming_accepted(); 149 150 qio_channel_set_name(QIO_CHANNEL(sioc), "migration-socket-incoming"); 151 migration_channel_process_incoming(QIO_CHANNEL(sioc)); 152 object_unref(OBJECT(sioc)); 153 154 out: 155 if (migration_has_all_channels()) { 156 /* Close listening socket as its no longer needed */ 157 qio_channel_close(ioc, NULL); 158 return G_SOURCE_REMOVE; 159 } else { 160 return G_SOURCE_CONTINUE; 161 } 162 } 163 164 165 static void socket_start_incoming_migration(SocketAddress *saddr, 166 Error **errp) 167 { 168 QIOChannelSocket *listen_ioc = qio_channel_socket_new(); 169 170 qio_channel_set_name(QIO_CHANNEL(listen_ioc), 171 "migration-socket-listener"); 172 173 if (qio_channel_socket_listen_sync(listen_ioc, saddr, errp) < 0) { 174 object_unref(OBJECT(listen_ioc)); 175 qapi_free_SocketAddress(saddr); 176 return; 177 } 178 179 qio_channel_add_watch(QIO_CHANNEL(listen_ioc), 180 G_IO_IN, 181 socket_accept_incoming_migration, 182 listen_ioc, 183 (GDestroyNotify)object_unref); 184 qapi_free_SocketAddress(saddr); 185 } 186 187 void tcp_start_incoming_migration(const char *host_port, Error **errp) 188 { 189 Error *err = NULL; 190 SocketAddress *saddr = tcp_build_address(host_port, &err); 191 if (!err) { 192 socket_start_incoming_migration(saddr, &err); 193 } 194 error_propagate(errp, err); 195 } 196 197 void unix_start_incoming_migration(const char *path, Error **errp) 198 { 199 SocketAddress *saddr = unix_build_address(path); 200 socket_start_incoming_migration(saddr, errp); 201 } 202