| 1 | /* |
| 2 | * Hub net client |
| 3 | * |
| 4 | * Copyright IBM, Corp. 2012 |
| 5 | * |
| 6 | * Authors: |
| 7 | * Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> |
| 8 | * Zhi Yong Wu <wuzhy@linux.vnet.ibm.com> |
| 9 | * |
| 10 | * This work is licensed under the terms of the GNU LGPL, version 2 or later. |
| 11 | * See the COPYING.LIB file in the top-level directory. |
| 12 | * |
| 13 | */ |
| 14 | |
| 15 | #include "qemu/osdep.h" |
| 16 | #include "qapi/error.h" |
| 17 | #include "qapi/util.h" |
| 18 | #include "net/net.h" |
| 19 | #include "clients.h" |
| 20 | #include "hub.h" |
| 21 | #include "qemu/iov.h" |
| 22 | #include "qemu/error-report.h" |
| 23 | #include "system/qtest.h" |
| 24 | |
| 25 | /* |
| 26 | * A hub broadcasts incoming packets to all its ports except the source port. |
| 27 | * Hubs can be used to provide independent emulated network segments. |
| 28 | */ |
| 29 | |
| 30 | typedef struct NetHub NetHub; |
| 31 | |
| 32 | typedef struct NetHubPort { |
| 33 | NetClientState nc; |
| 34 | QLIST_ENTRY(NetHubPort) next; |
| 35 | NetHub *hub; |
| 36 | int id; |
| 37 | bool listed; |
| 38 | } NetHubPort; |
| 39 | |
| 40 | struct NetHub { |
| 41 | int id; |
| 42 | QLIST_ENTRY(NetHub) next; |
| 43 | int num_ports; |
| 44 | QLIST_HEAD(, NetHubPort) ports; |
| 45 | }; |
| 46 | |
| 47 | static QLIST_HEAD(, NetHub) hubs = QLIST_HEAD_INITIALIZER(&hubs); |
| 48 | |
| 49 | static ssize_t net_hub_receive(NetHub *hub, NetHubPort *source_port, |
| 50 | const uint8_t *buf, size_t len) |
| 51 | { |
| 52 | NetHubPort *port; |
| 53 | |
| 54 | QLIST_FOREACH(port, &hub->ports, next) { |
| 55 | if (port == source_port) { |
| 56 | continue; |
| 57 | } |
| 58 | |
| 59 | qemu_send_packet(&port->nc, buf, len); |
| 60 | } |
| 61 | return len; |
| 62 | } |
| 63 | |
| 64 | static ssize_t net_hub_receive_iov(NetHub *hub, NetHubPort *source_port, |
| 65 | const struct iovec *iov, int iovcnt) |
| 66 | { |
| 67 | NetHubPort *port; |
| 68 | ssize_t len = iov_size(iov, iovcnt); |
| 69 | |
| 70 | QLIST_FOREACH(port, &hub->ports, next) { |
| 71 | if (port == source_port) { |
| 72 | continue; |
| 73 | } |
| 74 | |
| 75 | qemu_sendv_packet(&port->nc, iov, iovcnt); |
| 76 | } |
| 77 | return len; |
| 78 | } |
| 79 | |
| 80 | static NetHub *net_hub_new(int id) |
| 81 | { |
| 82 | NetHub *hub; |
| 83 | |
| 84 | hub = g_malloc(sizeof(*hub)); |
| 85 | hub->id = id; |
| 86 | hub->num_ports = 0; |
| 87 | QLIST_INIT(&hub->ports); |
| 88 | |
| 89 | QLIST_INSERT_HEAD(&hubs, hub, next); |
| 90 | |
| 91 | return hub; |
| 92 | } |
| 93 | |
| 94 | static bool net_hub_port_can_receive(NetClientState *nc) |
| 95 | { |
| 96 | NetHubPort *port; |
| 97 | NetHubPort *src_port = DO_UPCAST(NetHubPort, nc, nc); |
| 98 | NetHub *hub = src_port->hub; |
| 99 | |
| 100 | QLIST_FOREACH(port, &hub->ports, next) { |
| 101 | if (port == src_port) { |
| 102 | continue; |
| 103 | } |
| 104 | |
| 105 | if (qemu_can_send_packet(&port->nc)) { |
| 106 | return true; |
| 107 | } |
| 108 | } |
| 109 | |
| 110 | return false; |
| 111 | } |
| 112 | |
| 113 | static ssize_t net_hub_port_receive(NetClientState *nc, |
| 114 | const uint8_t *buf, size_t len) |
| 115 | { |
| 116 | NetHubPort *port = DO_UPCAST(NetHubPort, nc, nc); |
| 117 | |
| 118 | return net_hub_receive(port->hub, port, buf, len); |
| 119 | } |
| 120 | |
| 121 | static ssize_t net_hub_port_receive_iov(NetClientState *nc, |
| 122 | const struct iovec *iov, int iovcnt) |
| 123 | { |
| 124 | NetHubPort *port = DO_UPCAST(NetHubPort, nc, nc); |
| 125 | |
| 126 | return net_hub_receive_iov(port->hub, port, iov, iovcnt); |
| 127 | } |
| 128 | |
| 129 | static void net_hub_port_cleanup(NetClientState *nc) |
| 130 | { |
| 131 | NetHubPort *port = DO_UPCAST(NetHubPort, nc, nc); |
| 132 | |
| 133 | if (port->listed) { |
| 134 | QLIST_REMOVE(port, next); |
| 135 | port->listed = false; |
| 136 | } |
| 137 | } |
| 138 | |
| 139 | static NetClientInfo net_hub_port_info = { |
| 140 | .type = NET_CLIENT_DRIVER_HUBPORT, |
| 141 | .size = sizeof(NetHubPort), |
| 142 | .can_receive = net_hub_port_can_receive, |
| 143 | .receive = net_hub_port_receive, |
| 144 | .receive_iov = net_hub_port_receive_iov, |
| 145 | .cleanup = net_hub_port_cleanup, |
| 146 | }; |
| 147 | |
| 148 | static NetHubPort *net_hub_port_new(NetHub *hub, const char *name, |
| 149 | NetClientState *hubpeer) |
| 150 | { |
| 151 | NetClientState *nc; |
| 152 | NetHubPort *port; |
| 153 | int id = hub->num_ports++; |
| 154 | char default_name[128]; |
| 155 | |
| 156 | if (!name) { |
| 157 | snprintf(default_name, sizeof(default_name), |
| 158 | "hub%dport%d", hub->id, id); |
| 159 | name = default_name; |
| 160 | } |
| 161 | |
| 162 | nc = qemu_new_net_client(&net_hub_port_info, hubpeer, "hub", name); |
| 163 | port = DO_UPCAST(NetHubPort, nc, nc); |
| 164 | port->id = id; |
| 165 | port->hub = hub; |
| 166 | port->listed = false; |
| 167 | |
| 168 | QLIST_INSERT_HEAD(&hub->ports, port, next); |
| 169 | port->listed = true; |
| 170 | |
| 171 | return port; |
| 172 | } |
| 173 | |
| 174 | /** |
| 175 | * Create a port on a given hub |
| 176 | * @hub_id: Number of the hub |
| 177 | * @name: Net client name or NULL for default name. |
| 178 | * @hubpeer: Peer to use (if "netdev=id" has been specified) |
| 179 | * |
| 180 | * If there is no existing hub with the given id then a new hub is created. |
| 181 | */ |
| 182 | NetClientState *net_hub_add_port(int hub_id, const char *name, |
| 183 | NetClientState *hubpeer) |
| 184 | { |
| 185 | NetHub *hub; |
| 186 | NetHubPort *port; |
| 187 | |
| 188 | QLIST_FOREACH(hub, &hubs, next) { |
| 189 | if (hub->id == hub_id) { |
| 190 | break; |
| 191 | } |
| 192 | } |
| 193 | |
| 194 | if (!hub) { |
| 195 | hub = net_hub_new(hub_id); |
| 196 | } |
| 197 | |
| 198 | port = net_hub_port_new(hub, name, hubpeer); |
| 199 | return &port->nc; |
| 200 | } |
| 201 | |
| 202 | NetHubInfoList *net_hub_query_info(void) |
| 203 | { |
| 204 | NetHubInfoList *head = NULL, **tail = &head; |
| 205 | NetHub *hub; |
| 206 | |
| 207 | QLIST_FOREACH(hub, &hubs, next) { |
| 208 | NetHubInfo *hi = g_new0(NetHubInfo, 1); |
| 209 | NetHubPortInfoList **ptail = &hi->ports; |
| 210 | NetHubPort *port; |
| 211 | |
| 212 | hi->id = hub->id; |
| 213 | |
| 214 | QLIST_FOREACH(port, &hub->ports, next) { |
| 215 | NetHubPortInfo *pi = g_new0(NetHubPortInfo, 1); |
| 216 | pi->name = g_strdup(port->nc.name); |
| 217 | if (port->nc.peer) { |
| 218 | pi->peer = net_client_info(port->nc.peer); |
| 219 | } |
| 220 | QAPI_LIST_APPEND(ptail, pi); |
| 221 | } |
| 222 | |
| 223 | QAPI_LIST_APPEND(tail, hi); |
| 224 | } |
| 225 | |
| 226 | return head; |
| 227 | } |
| 228 | |
| 229 | /** |
| 230 | * Get the hub id that a client is connected to |
| 231 | * |
| 232 | * @id: Pointer for hub id output, may be NULL |
| 233 | */ |
| 234 | int net_hub_id_for_client(NetClientState *nc, int *id) |
| 235 | { |
| 236 | NetHubPort *port; |
| 237 | |
| 238 | if (nc->info->type == NET_CLIENT_DRIVER_HUBPORT) { |
| 239 | port = DO_UPCAST(NetHubPort, nc, nc); |
| 240 | } else if (nc->peer != NULL && nc->peer->info->type == |
| 241 | NET_CLIENT_DRIVER_HUBPORT) { |
| 242 | port = DO_UPCAST(NetHubPort, nc, nc->peer); |
| 243 | } else { |
| 244 | return -ENOENT; |
| 245 | } |
| 246 | |
| 247 | if (id) { |
| 248 | *id = port->hub->id; |
| 249 | } |
| 250 | return 0; |
| 251 | } |
| 252 | |
| 253 | int net_init_hubport(const Netdev *netdev, const char *name, |
| 254 | NetClientState *peer, Error **errp) |
| 255 | { |
| 256 | const NetdevHubPortOptions *hubport; |
| 257 | NetClientState *hubpeer = NULL; |
| 258 | |
| 259 | assert(netdev->type == NET_CLIENT_DRIVER_HUBPORT); |
| 260 | assert(!peer); |
| 261 | hubport = &netdev->u.hubport; |
| 262 | |
| 263 | if (hubport->netdev) { |
| 264 | hubpeer = qemu_find_netdev(hubport->netdev); |
| 265 | if (!hubpeer) { |
| 266 | error_setg(errp, "netdev '%s' not found", hubport->netdev); |
| 267 | return -1; |
| 268 | } |
| 269 | } |
| 270 | |
| 271 | net_hub_add_port(hubport->hubid, name, hubpeer); |
| 272 | |
| 273 | return 0; |
| 274 | } |
| 275 | |
| 276 | /** |
| 277 | * Warn if hub configurations are likely wrong |
| 278 | */ |
| 279 | void net_hub_check_clients(void) |
| 280 | { |
| 281 | NetHub *hub; |
| 282 | NetHubPort *port; |
| 283 | NetClientState *peer; |
| 284 | |
| 285 | QLIST_FOREACH(hub, &hubs, next) { |
| 286 | int has_nic = 0, has_host_dev = 0; |
| 287 | |
| 288 | QLIST_FOREACH(port, &hub->ports, next) { |
| 289 | peer = port->nc.peer; |
| 290 | if (!peer) { |
| 291 | warn_report("hub port %s has no peer", port->nc.name); |
| 292 | continue; |
| 293 | } |
| 294 | |
| 295 | switch (peer->info->type) { |
| 296 | case NET_CLIENT_DRIVER_NIC: |
| 297 | has_nic = 1; |
| 298 | break; |
| 299 | #ifdef CONFIG_PASST |
| 300 | case NET_CLIENT_DRIVER_PASST: |
| 301 | #endif |
| 302 | case NET_CLIENT_DRIVER_USER: |
| 303 | case NET_CLIENT_DRIVER_TAP: |
| 304 | case NET_CLIENT_DRIVER_SOCKET: |
| 305 | case NET_CLIENT_DRIVER_STREAM: |
| 306 | case NET_CLIENT_DRIVER_DGRAM: |
| 307 | case NET_CLIENT_DRIVER_VDE: |
| 308 | case NET_CLIENT_DRIVER_VHOST_USER: |
| 309 | has_host_dev = 1; |
| 310 | break; |
| 311 | default: |
| 312 | break; |
| 313 | } |
| 314 | } |
| 315 | if (has_host_dev && !has_nic) { |
| 316 | warn_report("hub %d with no nics", hub->id); |
| 317 | } |
| 318 | if (has_nic && !has_host_dev && !qtest_enabled()) { |
| 319 | warn_report("hub %d is not connected to host network", hub->id); |
| 320 | } |
| 321 | } |
| 322 | } |
| 323 | |
| 324 | bool net_hub_flush(NetClientState *nc) |
| 325 | { |
| 326 | NetHubPort *port; |
| 327 | NetHubPort *source_port = DO_UPCAST(NetHubPort, nc, nc); |
| 328 | int ret = 0; |
| 329 | |
| 330 | QLIST_FOREACH(port, &source_port->hub->ports, next) { |
| 331 | if (port != source_port) { |
| 332 | ret += qemu_net_queue_flush(port->nc.incoming_queue); |
| 333 | } |
| 334 | } |
| 335 | return ret ? true : false; |
| 336 | } |