Merge remote-tracking branch 'remotes/stefanha/tags/block-pull-request' into staging
[qemu.git] / net / filter-mirror.c
1 /*
2 * Copyright (c) 2016 HUAWEI TECHNOLOGIES CO., LTD.
3 * Copyright (c) 2016 FUJITSU LIMITED
4 * Copyright (c) 2016 Intel Corporation
5 *
6 * Author: Zhang Chen <zhangchen.fnst@cn.fujitsu.com>
7 *
8 * This work is licensed under the terms of the GNU GPL, version 2 or
9 * later. See the COPYING file in the top-level directory.
10 */
11
12 #include "qemu/osdep.h"
13 #include "net/filter.h"
14 #include "net/net.h"
15 #include "qemu-common.h"
16 #include "qapi/error.h"
17 #include "qapi/qmp/qerror.h"
18 #include "qapi-visit.h"
19 #include "qom/object.h"
20 #include "qemu/main-loop.h"
21 #include "qemu/error-report.h"
22 #include "trace.h"
23 #include "sysemu/char.h"
24 #include "qemu/iov.h"
25 #include "qemu/sockets.h"
26
27 #define FILTER_MIRROR(obj) \
28 OBJECT_CHECK(MirrorState, (obj), TYPE_FILTER_MIRROR)
29
30 #define FILTER_REDIRECTOR(obj) \
31 OBJECT_CHECK(MirrorState, (obj), TYPE_FILTER_REDIRECTOR)
32
33 #define TYPE_FILTER_MIRROR "filter-mirror"
34 #define TYPE_FILTER_REDIRECTOR "filter-redirector"
35 #define REDIRECTOR_MAX_LEN NET_BUFSIZE
36
37 typedef struct MirrorState {
38 NetFilterState parent_obj;
39 char *indev;
40 char *outdev;
41 CharBackend chr_in;
42 CharBackend chr_out;
43 SocketReadState rs;
44 } MirrorState;
45
46 static int filter_mirror_send(CharBackend *chr_out,
47 const struct iovec *iov,
48 int iovcnt)
49 {
50 int ret = 0;
51 ssize_t size = 0;
52 uint32_t len = 0;
53 char *buf;
54
55 size = iov_size(iov, iovcnt);
56 if (!size) {
57 return 0;
58 }
59
60 len = htonl(size);
61 ret = qemu_chr_fe_write_all(chr_out, (uint8_t *)&len, sizeof(len));
62 if (ret != sizeof(len)) {
63 goto err;
64 }
65
66 buf = g_malloc(size);
67 iov_to_buf(iov, iovcnt, 0, buf, size);
68 ret = qemu_chr_fe_write_all(chr_out, (uint8_t *)buf, size);
69 g_free(buf);
70 if (ret != size) {
71 goto err;
72 }
73
74 return 0;
75
76 err:
77 return ret < 0 ? ret : -EIO;
78 }
79
80 static void
81 redirector_to_filter(NetFilterState *nf, const uint8_t *buf, int len)
82 {
83 struct iovec iov = {
84 .iov_base = (void *)buf,
85 .iov_len = len,
86 };
87
88 if (nf->direction == NET_FILTER_DIRECTION_ALL ||
89 nf->direction == NET_FILTER_DIRECTION_TX) {
90 qemu_netfilter_pass_to_next(nf->netdev, 0, &iov, 1, nf);
91 }
92
93 if (nf->direction == NET_FILTER_DIRECTION_ALL ||
94 nf->direction == NET_FILTER_DIRECTION_RX) {
95 qemu_netfilter_pass_to_next(nf->netdev->peer, 0, &iov, 1, nf);
96 }
97 }
98
99 static int redirector_chr_can_read(void *opaque)
100 {
101 return REDIRECTOR_MAX_LEN;
102 }
103
104 static void redirector_chr_read(void *opaque, const uint8_t *buf, int size)
105 {
106 NetFilterState *nf = opaque;
107 MirrorState *s = FILTER_REDIRECTOR(nf);
108 int ret;
109
110 ret = net_fill_rstate(&s->rs, buf, size);
111
112 if (ret == -1) {
113 qemu_chr_fe_set_handlers(&s->chr_in, NULL, NULL, NULL,
114 NULL, NULL, true);
115 }
116 }
117
118 static void redirector_chr_event(void *opaque, int event)
119 {
120 NetFilterState *nf = opaque;
121 MirrorState *s = FILTER_REDIRECTOR(nf);
122
123 switch (event) {
124 case CHR_EVENT_CLOSED:
125 qemu_chr_fe_set_handlers(&s->chr_in, NULL, NULL, NULL,
126 NULL, NULL, true);
127 break;
128 default:
129 break;
130 }
131 }
132
133 static ssize_t filter_mirror_receive_iov(NetFilterState *nf,
134 NetClientState *sender,
135 unsigned flags,
136 const struct iovec *iov,
137 int iovcnt,
138 NetPacketSent *sent_cb)
139 {
140 MirrorState *s = FILTER_MIRROR(nf);
141 int ret;
142
143 ret = filter_mirror_send(&s->chr_out, iov, iovcnt);
144 if (ret) {
145 error_report("filter_mirror_send failed(%s)", strerror(-ret));
146 }
147
148 /*
149 * we don't hope this error interrupt the normal
150 * path of net packet, so we always return zero.
151 */
152 return 0;
153 }
154
155 static ssize_t filter_redirector_receive_iov(NetFilterState *nf,
156 NetClientState *sender,
157 unsigned flags,
158 const struct iovec *iov,
159 int iovcnt,
160 NetPacketSent *sent_cb)
161 {
162 MirrorState *s = FILTER_REDIRECTOR(nf);
163 int ret;
164
165 if (qemu_chr_fe_get_driver(&s->chr_out)) {
166 ret = filter_mirror_send(&s->chr_out, iov, iovcnt);
167 if (ret) {
168 error_report("filter_mirror_send failed(%s)", strerror(-ret));
169 }
170 return iov_size(iov, iovcnt);
171 } else {
172 return 0;
173 }
174 }
175
176 static void filter_mirror_cleanup(NetFilterState *nf)
177 {
178 MirrorState *s = FILTER_MIRROR(nf);
179
180 qemu_chr_fe_deinit(&s->chr_out);
181 }
182
183 static void filter_redirector_cleanup(NetFilterState *nf)
184 {
185 MirrorState *s = FILTER_REDIRECTOR(nf);
186
187 qemu_chr_fe_deinit(&s->chr_in);
188 qemu_chr_fe_deinit(&s->chr_out);
189 }
190
191 static void filter_mirror_setup(NetFilterState *nf, Error **errp)
192 {
193 MirrorState *s = FILTER_MIRROR(nf);
194 CharDriverState *chr;
195
196 if (!s->outdev) {
197 error_setg(errp, "filter mirror needs 'outdev' "
198 "property set");
199 return;
200 }
201
202 chr = qemu_chr_find(s->outdev);
203 if (chr == NULL) {
204 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
205 "Device '%s' not found", s->outdev);
206 return;
207 }
208
209 qemu_chr_fe_init(&s->chr_out, chr, errp);
210 }
211
212 static void redirector_rs_finalize(SocketReadState *rs)
213 {
214 MirrorState *s = container_of(rs, MirrorState, rs);
215 NetFilterState *nf = NETFILTER(s);
216
217 redirector_to_filter(nf, rs->buf, rs->packet_len);
218 }
219
220 static void filter_redirector_setup(NetFilterState *nf, Error **errp)
221 {
222 MirrorState *s = FILTER_REDIRECTOR(nf);
223 CharDriverState *chr;
224
225 if (!s->indev && !s->outdev) {
226 error_setg(errp, "filter redirector needs 'indev' or "
227 "'outdev' at least one property set");
228 return;
229 } else if (s->indev && s->outdev) {
230 if (!strcmp(s->indev, s->outdev)) {
231 error_setg(errp, "'indev' and 'outdev' could not be same "
232 "for filter redirector");
233 return;
234 }
235 }
236
237 net_socket_rs_init(&s->rs, redirector_rs_finalize);
238
239 if (s->indev) {
240 chr = qemu_chr_find(s->indev);
241 if (chr == NULL) {
242 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
243 "IN Device '%s' not found", s->indev);
244 return;
245 }
246
247 if (!qemu_chr_fe_init(&s->chr_in, chr, errp)) {
248 return;
249 }
250
251 qemu_chr_fe_set_handlers(&s->chr_in, redirector_chr_can_read,
252 redirector_chr_read, redirector_chr_event,
253 nf, NULL, true);
254 }
255
256 if (s->outdev) {
257 chr = qemu_chr_find(s->outdev);
258 if (chr == NULL) {
259 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
260 "OUT Device '%s' not found", s->outdev);
261 return;
262 }
263 if (!qemu_chr_fe_init(&s->chr_out, chr, errp)) {
264 return;
265 }
266 }
267 }
268
269 static void filter_mirror_class_init(ObjectClass *oc, void *data)
270 {
271 NetFilterClass *nfc = NETFILTER_CLASS(oc);
272
273 nfc->setup = filter_mirror_setup;
274 nfc->cleanup = filter_mirror_cleanup;
275 nfc->receive_iov = filter_mirror_receive_iov;
276 }
277
278 static void filter_redirector_class_init(ObjectClass *oc, void *data)
279 {
280 NetFilterClass *nfc = NETFILTER_CLASS(oc);
281
282 nfc->setup = filter_redirector_setup;
283 nfc->cleanup = filter_redirector_cleanup;
284 nfc->receive_iov = filter_redirector_receive_iov;
285 }
286
287 static char *filter_redirector_get_indev(Object *obj, Error **errp)
288 {
289 MirrorState *s = FILTER_REDIRECTOR(obj);
290
291 return g_strdup(s->indev);
292 }
293
294 static void
295 filter_redirector_set_indev(Object *obj, const char *value, Error **errp)
296 {
297 MirrorState *s = FILTER_REDIRECTOR(obj);
298
299 g_free(s->indev);
300 s->indev = g_strdup(value);
301 }
302
303 static char *filter_mirror_get_outdev(Object *obj, Error **errp)
304 {
305 MirrorState *s = FILTER_MIRROR(obj);
306
307 return g_strdup(s->outdev);
308 }
309
310 static void
311 filter_mirror_set_outdev(Object *obj, const char *value, Error **errp)
312 {
313 MirrorState *s = FILTER_MIRROR(obj);
314
315 g_free(s->outdev);
316 s->outdev = g_strdup(value);
317 if (!s->outdev) {
318 error_setg(errp, "filter mirror needs 'outdev' "
319 "property set");
320 return;
321 }
322 }
323
324 static char *filter_redirector_get_outdev(Object *obj, Error **errp)
325 {
326 MirrorState *s = FILTER_REDIRECTOR(obj);
327
328 return g_strdup(s->outdev);
329 }
330
331 static void
332 filter_redirector_set_outdev(Object *obj, const char *value, Error **errp)
333 {
334 MirrorState *s = FILTER_REDIRECTOR(obj);
335
336 g_free(s->outdev);
337 s->outdev = g_strdup(value);
338 }
339
340 static void filter_mirror_init(Object *obj)
341 {
342 object_property_add_str(obj, "outdev", filter_mirror_get_outdev,
343 filter_mirror_set_outdev, NULL);
344 }
345
346 static void filter_redirector_init(Object *obj)
347 {
348 object_property_add_str(obj, "indev", filter_redirector_get_indev,
349 filter_redirector_set_indev, NULL);
350 object_property_add_str(obj, "outdev", filter_redirector_get_outdev,
351 filter_redirector_set_outdev, NULL);
352 }
353
354 static void filter_mirror_fini(Object *obj)
355 {
356 MirrorState *s = FILTER_MIRROR(obj);
357
358 g_free(s->outdev);
359 }
360
361 static void filter_redirector_fini(Object *obj)
362 {
363 MirrorState *s = FILTER_REDIRECTOR(obj);
364
365 g_free(s->indev);
366 g_free(s->outdev);
367 }
368
369 static const TypeInfo filter_redirector_info = {
370 .name = TYPE_FILTER_REDIRECTOR,
371 .parent = TYPE_NETFILTER,
372 .class_init = filter_redirector_class_init,
373 .instance_init = filter_redirector_init,
374 .instance_finalize = filter_redirector_fini,
375 .instance_size = sizeof(MirrorState),
376 };
377
378 static const TypeInfo filter_mirror_info = {
379 .name = TYPE_FILTER_MIRROR,
380 .parent = TYPE_NETFILTER,
381 .class_init = filter_mirror_class_init,
382 .instance_init = filter_mirror_init,
383 .instance_finalize = filter_mirror_fini,
384 .instance_size = sizeof(MirrorState),
385 };
386
387 static void register_types(void)
388 {
389 type_register_static(&filter_mirror_info);
390 type_register_static(&filter_redirector_info);
391 }
392
393 type_init(register_types);