1 /* 2 * QEMU live migration via Unix Domain Sockets 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(Object *src, 74 Error *err, 75 gpointer opaque) 76 { 77 struct SocketConnectData *data = opaque; 78 QIOChannel *sioc = QIO_CHANNEL(src); 79 80 if (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 } else { 85 trace_migration_socket_outgoing_connected(data->hostname); 86 migration_channel_connect(data->s, sioc, data->hostname); 87 } 88 object_unref(src); 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 data->s = s; 98 if (saddr->type == SOCKET_ADDRESS_KIND_INET) { 99 data->hostname = g_strdup(saddr->u.inet.data->host); 100 } 101 qio_channel_socket_connect_async(sioc, 102 saddr, 103 socket_outgoing_migration, 104 data, 105 socket_connect_data_free); 106 qapi_free_SocketAddress(saddr); 107 } 108 109 void tcp_start_outgoing_migration(MigrationState *s, 110 const char *host_port, 111 Error **errp) 112 { 113 SocketAddress *saddr = tcp_build_address(host_port, errp); 114 socket_start_outgoing_migration(s, saddr, errp); 115 } 116 117 void unix_start_outgoing_migration(MigrationState *s, 118 const char *path, 119 Error **errp) 120 { 121 SocketAddress *saddr = unix_build_address(path); 122 socket_start_outgoing_migration(s, saddr, errp); 123 } 124 125 126 static gboolean socket_accept_incoming_migration(QIOChannel *ioc, 127 GIOCondition condition, 128 gpointer opaque) 129 { 130 QIOChannelSocket *sioc; 131 Error *err = NULL; 132 133 sioc = qio_channel_socket_accept(QIO_CHANNEL_SOCKET(ioc), 134 &err); 135 if (!sioc) { 136 error_report("could not accept migration connection (%s)", 137 error_get_pretty(err)); 138 goto out; 139 } 140 141 trace_migration_socket_incoming_accepted(); 142 143 migration_channel_process_incoming(migrate_get_current(), 144 QIO_CHANNEL(sioc)); 145 object_unref(OBJECT(sioc)); 146 147 out: 148 /* Close listening socket as its no longer needed */ 149 qio_channel_close(ioc, NULL); 150 return FALSE; /* unregister */ 151 } 152 153 154 static void socket_start_incoming_migration(SocketAddress *saddr, 155 Error **errp) 156 { 157 QIOChannelSocket *listen_ioc = qio_channel_socket_new(); 158 159 if (qio_channel_socket_listen_sync(listen_ioc, saddr, errp) < 0) { 160 object_unref(OBJECT(listen_ioc)); 161 qapi_free_SocketAddress(saddr); 162 return; 163 } 164 165 qio_channel_add_watch(QIO_CHANNEL(listen_ioc), 166 G_IO_IN, 167 socket_accept_incoming_migration, 168 listen_ioc, 169 (GDestroyNotify)object_unref); 170 qapi_free_SocketAddress(saddr); 171 } 172 173 void tcp_start_incoming_migration(const char *host_port, Error **errp) 174 { 175 SocketAddress *saddr = tcp_build_address(host_port, errp); 176 socket_start_incoming_migration(saddr, errp); 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 } 184