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 "monitor/monitor.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 "sysemu/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 | } NetHubPort; |
38 | |
39 | struct NetHub { |
40 | int id; |
41 | QLIST_ENTRY(NetHub) next; |
42 | int num_ports; |
43 | QLIST_HEAD(, NetHubPort) ports; |
44 | }; |
45 | |
46 | static QLIST_HEAD(, NetHub) hubs = QLIST_HEAD_INITIALIZER(&hubs); |
47 | |
48 | static ssize_t net_hub_receive(NetHub *hub, NetHubPort *source_port, |
49 | const uint8_t *buf, size_t len) |
50 | { |
51 | NetHubPort *port; |
52 | |
53 | QLIST_FOREACH(port, &hub->ports, next) { |
54 | if (port == source_port) { |
55 | continue; |
56 | } |
57 | |
58 | qemu_send_packet(&port->nc, buf, len); |
59 | } |
60 | return len; |
61 | } |
62 | |
63 | static ssize_t net_hub_receive_iov(NetHub *hub, NetHubPort *source_port, |
64 | const struct iovec *iov, int iovcnt) |
65 | { |
66 | NetHubPort *port; |
67 | ssize_t len = iov_size(iov, iovcnt); |
68 | |
69 | QLIST_FOREACH(port, &hub->ports, next) { |
70 | if (port == source_port) { |
71 | continue; |
72 | } |
73 | |
74 | qemu_sendv_packet(&port->nc, iov, iovcnt); |
75 | } |
76 | return len; |
77 | } |
78 | |
79 | static NetHub *net_hub_new(int id) |
80 | { |
81 | NetHub *hub; |
82 | |
83 | hub = g_malloc(sizeof(*hub)); |
84 | hub->id = id; |
85 | hub->num_ports = 0; |
86 | QLIST_INIT(&hub->ports); |
87 | |
88 | QLIST_INSERT_HEAD(&hubs, hub, next); |
89 | |
90 | return hub; |
91 | } |
92 | |
93 | static int net_hub_port_can_receive(NetClientState *nc) |
94 | { |
95 | NetHubPort *port; |
96 | NetHubPort *src_port = DO_UPCAST(NetHubPort, nc, nc); |
97 | NetHub *hub = src_port->hub; |
98 | |
99 | QLIST_FOREACH(port, &hub->ports, next) { |
100 | if (port == src_port) { |
101 | continue; |
102 | } |
103 | |
104 | if (qemu_can_send_packet(&port->nc)) { |
105 | return 1; |
106 | } |
107 | } |
108 | |
109 | return 0; |
110 | } |
111 | |
112 | static ssize_t net_hub_port_receive(NetClientState *nc, |
113 | const uint8_t *buf, size_t len) |
114 | { |
115 | NetHubPort *port = DO_UPCAST(NetHubPort, nc, nc); |
116 | |
117 | return net_hub_receive(port->hub, port, buf, len); |
118 | } |
119 | |
120 | static ssize_t net_hub_port_receive_iov(NetClientState *nc, |
121 | const struct iovec *iov, int iovcnt) |
122 | { |
123 | NetHubPort *port = DO_UPCAST(NetHubPort, nc, nc); |
124 | |
125 | return net_hub_receive_iov(port->hub, port, iov, iovcnt); |
126 | } |
127 | |
128 | static void net_hub_port_cleanup(NetClientState *nc) |
129 | { |
130 | NetHubPort *port = DO_UPCAST(NetHubPort, nc, nc); |
131 | |
132 | QLIST_REMOVE(port, next); |
133 | } |
134 | |
135 | static NetClientInfo net_hub_port_info = { |
136 | .type = NET_CLIENT_DRIVER_HUBPORT, |
137 | .size = sizeof(NetHubPort), |
138 | .can_receive = net_hub_port_can_receive, |
139 | .receive = net_hub_port_receive, |
140 | .receive_iov = net_hub_port_receive_iov, |
141 | .cleanup = net_hub_port_cleanup, |
142 | }; |
143 | |
144 | static NetHubPort *net_hub_port_new(NetHub *hub, const char *name, |
145 | NetClientState *hubpeer) |
146 | { |
147 | NetClientState *nc; |
148 | NetHubPort *port; |
149 | int id = hub->num_ports++; |
150 | char default_name[128]; |
151 | |
152 | if (!name) { |
153 | snprintf(default_name, sizeof(default_name), |
154 | "hub%dport%d" , hub->id, id); |
155 | name = default_name; |
156 | } |
157 | |
158 | nc = qemu_new_net_client(&net_hub_port_info, hubpeer, "hub" , name); |
159 | port = DO_UPCAST(NetHubPort, nc, nc); |
160 | port->id = id; |
161 | port->hub = hub; |
162 | |
163 | QLIST_INSERT_HEAD(&hub->ports, port, next); |
164 | |
165 | return port; |
166 | } |
167 | |
168 | /** |
169 | * Create a port on a given hub |
170 | * @hub_id: Number of the hub |
171 | * @name: Net client name or NULL for default name. |
172 | * @hubpeer: Peer to use (if "netdev=id" has been specified) |
173 | * |
174 | * If there is no existing hub with the given id then a new hub is created. |
175 | */ |
176 | NetClientState *net_hub_add_port(int hub_id, const char *name, |
177 | NetClientState *hubpeer) |
178 | { |
179 | NetHub *hub; |
180 | NetHubPort *port; |
181 | |
182 | QLIST_FOREACH(hub, &hubs, next) { |
183 | if (hub->id == hub_id) { |
184 | break; |
185 | } |
186 | } |
187 | |
188 | if (!hub) { |
189 | hub = net_hub_new(hub_id); |
190 | } |
191 | |
192 | port = net_hub_port_new(hub, name, hubpeer); |
193 | return &port->nc; |
194 | } |
195 | |
196 | /** |
197 | * Find a specific client on a hub |
198 | */ |
199 | NetClientState *net_hub_find_client_by_name(int hub_id, const char *name) |
200 | { |
201 | NetHub *hub; |
202 | NetHubPort *port; |
203 | NetClientState *peer; |
204 | |
205 | QLIST_FOREACH(hub, &hubs, next) { |
206 | if (hub->id == hub_id) { |
207 | QLIST_FOREACH(port, &hub->ports, next) { |
208 | peer = port->nc.peer; |
209 | |
210 | if (peer && strcmp(peer->name, name) == 0) { |
211 | return peer; |
212 | } |
213 | } |
214 | } |
215 | } |
216 | return NULL; |
217 | } |
218 | |
219 | /** |
220 | * Find a available port on a hub; otherwise create one new port |
221 | */ |
222 | NetClientState *net_hub_port_find(int hub_id) |
223 | { |
224 | NetHub *hub; |
225 | NetHubPort *port; |
226 | NetClientState *nc; |
227 | |
228 | QLIST_FOREACH(hub, &hubs, next) { |
229 | if (hub->id == hub_id) { |
230 | QLIST_FOREACH(port, &hub->ports, next) { |
231 | nc = port->nc.peer; |
232 | if (!nc) { |
233 | return &(port->nc); |
234 | } |
235 | } |
236 | break; |
237 | } |
238 | } |
239 | |
240 | nc = net_hub_add_port(hub_id, NULL, NULL); |
241 | return nc; |
242 | } |
243 | |
244 | /** |
245 | * Print hub configuration |
246 | */ |
247 | void net_hub_info(Monitor *mon) |
248 | { |
249 | NetHub *hub; |
250 | NetHubPort *port; |
251 | |
252 | QLIST_FOREACH(hub, &hubs, next) { |
253 | monitor_printf(mon, "hub %d\n" , hub->id); |
254 | QLIST_FOREACH(port, &hub->ports, next) { |
255 | monitor_printf(mon, " \\ %s" , port->nc.name); |
256 | if (port->nc.peer) { |
257 | monitor_printf(mon, ": " ); |
258 | print_net_client(mon, port->nc.peer); |
259 | } else { |
260 | monitor_printf(mon, "\n" ); |
261 | } |
262 | } |
263 | } |
264 | } |
265 | |
266 | /** |
267 | * Get the hub id that a client is connected to |
268 | * |
269 | * @id: Pointer for hub id output, may be NULL |
270 | */ |
271 | int net_hub_id_for_client(NetClientState *nc, int *id) |
272 | { |
273 | NetHubPort *port; |
274 | |
275 | if (nc->info->type == NET_CLIENT_DRIVER_HUBPORT) { |
276 | port = DO_UPCAST(NetHubPort, nc, nc); |
277 | } else if (nc->peer != NULL && nc->peer->info->type == |
278 | NET_CLIENT_DRIVER_HUBPORT) { |
279 | port = DO_UPCAST(NetHubPort, nc, nc->peer); |
280 | } else { |
281 | return -ENOENT; |
282 | } |
283 | |
284 | if (id) { |
285 | *id = port->hub->id; |
286 | } |
287 | return 0; |
288 | } |
289 | |
290 | int net_init_hubport(const Netdev *netdev, const char *name, |
291 | NetClientState *peer, Error **errp) |
292 | { |
293 | const NetdevHubPortOptions *hubport; |
294 | NetClientState *hubpeer = NULL; |
295 | |
296 | assert(netdev->type == NET_CLIENT_DRIVER_HUBPORT); |
297 | assert(!peer); |
298 | hubport = &netdev->u.hubport; |
299 | |
300 | if (hubport->has_netdev) { |
301 | hubpeer = qemu_find_netdev(hubport->netdev); |
302 | if (!hubpeer) { |
303 | error_setg(errp, "netdev '%s' not found" , hubport->netdev); |
304 | return -1; |
305 | } |
306 | } |
307 | |
308 | net_hub_add_port(hubport->hubid, name, hubpeer); |
309 | |
310 | return 0; |
311 | } |
312 | |
313 | /** |
314 | * Warn if hub configurations are likely wrong |
315 | */ |
316 | void net_hub_check_clients(void) |
317 | { |
318 | NetHub *hub; |
319 | NetHubPort *port; |
320 | NetClientState *peer; |
321 | |
322 | QLIST_FOREACH(hub, &hubs, next) { |
323 | int has_nic = 0, has_host_dev = 0; |
324 | |
325 | QLIST_FOREACH(port, &hub->ports, next) { |
326 | peer = port->nc.peer; |
327 | if (!peer) { |
328 | warn_report("hub port %s has no peer" , port->nc.name); |
329 | continue; |
330 | } |
331 | |
332 | switch (peer->info->type) { |
333 | case NET_CLIENT_DRIVER_NIC: |
334 | has_nic = 1; |
335 | break; |
336 | case NET_CLIENT_DRIVER_USER: |
337 | case NET_CLIENT_DRIVER_TAP: |
338 | case NET_CLIENT_DRIVER_SOCKET: |
339 | case NET_CLIENT_DRIVER_VDE: |
340 | case NET_CLIENT_DRIVER_VHOST_USER: |
341 | has_host_dev = 1; |
342 | break; |
343 | default: |
344 | break; |
345 | } |
346 | } |
347 | if (has_host_dev && !has_nic) { |
348 | warn_report("hub %d with no nics" , hub->id); |
349 | } |
350 | if (has_nic && !has_host_dev && !qtest_enabled()) { |
351 | warn_report("hub %d is not connected to host network" , hub->id); |
352 | } |
353 | } |
354 | } |
355 | |
356 | bool net_hub_flush(NetClientState *nc) |
357 | { |
358 | NetHubPort *port; |
359 | NetHubPort *source_port = DO_UPCAST(NetHubPort, nc, nc); |
360 | int ret = 0; |
361 | |
362 | QLIST_FOREACH(port, &source_port->hub->ports, next) { |
363 | if (port != source_port) { |
364 | ret += qemu_net_queue_flush(port->nc.incoming_queue); |
365 | } |
366 | } |
367 | return ret ? true : false; |
368 | } |
369 | |