| 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 "qapi/error.h" |
| 16 | #include "qom/object.h" |
| 17 | #include "qemu/main-loop.h" |
| 18 | #include "qemu/error-report.h" |
| 19 | #include "trace.h" |
| 20 | #include "chardev/char-fe.h" |
| 21 | #include "qemu/iov.h" |
| 22 | #include "qemu/sockets.h" |
| 23 | #include "qemu/aio-wait.h" |
| 24 | |
| 25 | #define TYPE_FILTER_MIRROR "filter-mirror" |
| 26 | typedef struct MirrorState MirrorState; |
| 27 | DECLARE_INSTANCE_CHECKER(MirrorState, FILTER_MIRROR, |
| 28 | TYPE_FILTER_MIRROR) |
| 29 | |
| 30 | #define TYPE_FILTER_REDIRECTOR "filter-redirector" |
| 31 | DECLARE_INSTANCE_CHECKER(MirrorState, FILTER_REDIRECTOR, |
| 32 | TYPE_FILTER_REDIRECTOR) |
| 33 | |
| 34 | #define REDIRECTOR_MAX_LEN NET_BUFSIZE |
| 35 | |
| 36 | struct MirrorState { |
| 37 | NetFilterState parent_obj; |
| 38 | char *indev; |
| 39 | char *outdev; |
| 40 | CharFrontend chr_in; |
| 41 | CharFrontend chr_out; |
| 42 | SocketReadState rs; |
| 43 | bool vnet_hdr; |
| 44 | }; |
| 45 | |
| 46 | typedef struct FilterSendCo { |
| 47 | MirrorState *s; |
| 48 | char *buf; |
| 49 | ssize_t size; |
| 50 | bool done; |
| 51 | int ret; |
| 52 | } FilterSendCo; |
| 53 | |
| 54 | static int _filter_send(MirrorState *s, |
| 55 | char *buf, |
| 56 | ssize_t size) |
| 57 | { |
| 58 | NetFilterState *nf = NETFILTER(s); |
| 59 | int ret = 0; |
| 60 | uint32_t len = 0; |
| 61 | |
| 62 | len = htonl(size); |
| 63 | ret = qemu_chr_fe_write_all(&s->chr_out, (uint8_t *)&len, sizeof(len)); |
| 64 | if (ret != sizeof(len)) { |
| 65 | goto err; |
| 66 | } |
| 67 | |
| 68 | if (s->vnet_hdr) { |
| 69 | /* |
| 70 | * If vnet_hdr = on, we send vnet header len to make other |
| 71 | * module(like colo-compare) know how to parse net |
| 72 | * packet correctly. |
| 73 | */ |
| 74 | ssize_t vnet_hdr_len; |
| 75 | |
| 76 | vnet_hdr_len = nf->netdev->vnet_hdr_len; |
| 77 | |
| 78 | len = htonl(vnet_hdr_len); |
| 79 | ret = qemu_chr_fe_write_all(&s->chr_out, (uint8_t *)&len, sizeof(len)); |
| 80 | if (ret != sizeof(len)) { |
| 81 | goto err; |
| 82 | } |
| 83 | } |
| 84 | |
| 85 | ret = qemu_chr_fe_write_all(&s->chr_out, (uint8_t *)buf, size); |
| 86 | if (ret != size) { |
| 87 | goto err; |
| 88 | } |
| 89 | |
| 90 | return size; |
| 91 | |
| 92 | err: |
| 93 | return ret < 0 ? ret : -EIO; |
| 94 | } |
| 95 | |
| 96 | static void coroutine_fn filter_send_co(void *opaque) |
| 97 | { |
| 98 | FilterSendCo *data = opaque; |
| 99 | |
| 100 | data->ret = _filter_send(data->s, data->buf, data->size); |
| 101 | data->done = true; |
| 102 | g_free(data->buf); |
| 103 | aio_wait_kick(); |
| 104 | } |
| 105 | |
| 106 | static int filter_send(MirrorState *s, |
| 107 | const struct iovec *iov, |
| 108 | int iovcnt) |
| 109 | { |
| 110 | ssize_t size = iov_size(iov, iovcnt); |
| 111 | char *buf = NULL; |
| 112 | |
| 113 | if (!size) { |
| 114 | return 0; |
| 115 | } |
| 116 | |
| 117 | buf = g_malloc(size); |
| 118 | iov_to_buf(iov, iovcnt, 0, buf, size); |
| 119 | |
| 120 | FilterSendCo data = { |
| 121 | .s = s, |
| 122 | .size = size, |
| 123 | .buf = buf, |
| 124 | .ret = 0, |
| 125 | }; |
| 126 | |
| 127 | Coroutine *co = qemu_coroutine_create(filter_send_co, &data); |
| 128 | qemu_coroutine_enter(co); |
| 129 | |
| 130 | while (!data.done) { |
| 131 | aio_poll(qemu_get_aio_context(), true); |
| 132 | } |
| 133 | |
| 134 | return data.ret; |
| 135 | } |
| 136 | |
| 137 | static void redirector_to_filter(NetFilterState *nf, |
| 138 | const uint8_t *buf, |
| 139 | int len) |
| 140 | { |
| 141 | struct iovec iov = { |
| 142 | .iov_base = (void *)buf, |
| 143 | .iov_len = len, |
| 144 | }; |
| 145 | |
| 146 | if (nf->direction == NET_FILTER_DIRECTION_ALL || |
| 147 | nf->direction == NET_FILTER_DIRECTION_TX) { |
| 148 | qemu_netfilter_pass_to_next(nf->netdev, 0, &iov, 1, nf); |
| 149 | } |
| 150 | |
| 151 | if (nf->direction == NET_FILTER_DIRECTION_ALL || |
| 152 | nf->direction == NET_FILTER_DIRECTION_RX) { |
| 153 | qemu_netfilter_pass_to_next(nf->netdev->peer, 0, &iov, 1, nf); |
| 154 | } |
| 155 | } |
| 156 | |
| 157 | static int redirector_chr_can_read(void *opaque) |
| 158 | { |
| 159 | return REDIRECTOR_MAX_LEN; |
| 160 | } |
| 161 | |
| 162 | static void redirector_chr_read(void *opaque, const uint8_t *buf, int size) |
| 163 | { |
| 164 | NetFilterState *nf = opaque; |
| 165 | MirrorState *s = FILTER_REDIRECTOR(nf); |
| 166 | int ret; |
| 167 | |
| 168 | ret = net_fill_rstate(&s->rs, buf, size); |
| 169 | |
| 170 | if (ret == -1) { |
| 171 | qemu_chr_fe_set_handlers(&s->chr_in, NULL, NULL, NULL, |
| 172 | NULL, NULL, NULL, true); |
| 173 | } |
| 174 | } |
| 175 | |
| 176 | static void redirector_chr_event(void *opaque, QEMUChrEvent event) |
| 177 | { |
| 178 | NetFilterState *nf = opaque; |
| 179 | MirrorState *s = FILTER_REDIRECTOR(nf); |
| 180 | |
| 181 | switch (event) { |
| 182 | case CHR_EVENT_OPENED: |
| 183 | if (nf->on) { |
| 184 | qemu_chr_fe_set_handlers_full(&s->chr_in, redirector_chr_can_read, |
| 185 | redirector_chr_read, redirector_chr_event, |
| 186 | NULL, nf, NULL, false, false); |
| 187 | } |
| 188 | break; |
| 189 | case CHR_EVENT_CLOSED: |
| 190 | qemu_chr_fe_set_handlers_full(&s->chr_in, NULL, NULL, redirector_chr_event, |
| 191 | NULL, nf, NULL, false, false); |
| 192 | break; |
| 193 | default: |
| 194 | break; |
| 195 | } |
| 196 | } |
| 197 | |
| 198 | static ssize_t filter_mirror_receive_iov(NetFilterState *nf, |
| 199 | NetClientState *sender, |
| 200 | unsigned flags, |
| 201 | const struct iovec *iov, |
| 202 | int iovcnt, |
| 203 | NetPacketSent *sent_cb) |
| 204 | { |
| 205 | MirrorState *s = FILTER_MIRROR(nf); |
| 206 | int ret; |
| 207 | |
| 208 | ret = filter_send(s, iov, iovcnt); |
| 209 | if (ret < 0) { |
| 210 | error_report("filter mirror send failed(%s)", strerror(-ret)); |
| 211 | } |
| 212 | |
| 213 | /* |
| 214 | * we don't hope this error interrupt the normal |
| 215 | * path of net packet, so we always return zero. |
| 216 | */ |
| 217 | return 0; |
| 218 | } |
| 219 | |
| 220 | static ssize_t filter_redirector_receive_iov(NetFilterState *nf, |
| 221 | NetClientState *sender, |
| 222 | unsigned flags, |
| 223 | const struct iovec *iov, |
| 224 | int iovcnt, |
| 225 | NetPacketSent *sent_cb) |
| 226 | { |
| 227 | MirrorState *s = FILTER_REDIRECTOR(nf); |
| 228 | int ret; |
| 229 | |
| 230 | if (qemu_chr_fe_backend_connected(&s->chr_out)) { |
| 231 | ret = filter_send(s, iov, iovcnt); |
| 232 | if (ret < 0) { |
| 233 | error_report("filter redirector send failed(%s)", strerror(-ret)); |
| 234 | } |
| 235 | return ret; |
| 236 | } else { |
| 237 | return 0; |
| 238 | } |
| 239 | } |
| 240 | |
| 241 | static void filter_mirror_cleanup(NetFilterState *nf) |
| 242 | { |
| 243 | MirrorState *s = FILTER_MIRROR(nf); |
| 244 | |
| 245 | qemu_chr_fe_deinit(&s->chr_out, false); |
| 246 | } |
| 247 | |
| 248 | static void filter_redirector_cleanup(NetFilterState *nf) |
| 249 | { |
| 250 | MirrorState *s = FILTER_REDIRECTOR(nf); |
| 251 | |
| 252 | qemu_chr_fe_deinit(&s->chr_in, false); |
| 253 | qemu_chr_fe_deinit(&s->chr_out, false); |
| 254 | } |
| 255 | |
| 256 | static void filter_mirror_setup(NetFilterState *nf, Error **errp) |
| 257 | { |
| 258 | MirrorState *s = FILTER_MIRROR(nf); |
| 259 | Chardev *chr; |
| 260 | |
| 261 | if (s->outdev == NULL) { |
| 262 | error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, "filter-mirror parameter"\ |
| 263 | " 'outdev' cannot be empty"); |
| 264 | return; |
| 265 | } |
| 266 | |
| 267 | chr = qemu_chr_find(s->outdev); |
| 268 | if (chr == NULL) { |
| 269 | error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, |
| 270 | "Device '%s' not found", s->outdev); |
| 271 | return; |
| 272 | } |
| 273 | |
| 274 | qemu_chr_fe_init(&s->chr_out, chr, errp); |
| 275 | } |
| 276 | |
| 277 | static void redirector_rs_finalize(SocketReadState *rs) |
| 278 | { |
| 279 | MirrorState *s = container_of(rs, MirrorState, rs); |
| 280 | NetFilterState *nf = NETFILTER(s); |
| 281 | |
| 282 | redirector_to_filter(nf, rs->buf, rs->packet_len); |
| 283 | } |
| 284 | |
| 285 | static void filter_redirector_setup(NetFilterState *nf, Error **errp) |
| 286 | { |
| 287 | MirrorState *s = FILTER_REDIRECTOR(nf); |
| 288 | Chardev *chr; |
| 289 | |
| 290 | if (!s->indev && !s->outdev) { |
| 291 | error_setg(errp, "filter redirector needs 'indev' or " |
| 292 | "'outdev' at least one property set"); |
| 293 | return; |
| 294 | } else if (s->indev && s->outdev) { |
| 295 | if (!strcmp(s->indev, s->outdev)) { |
| 296 | error_setg(errp, "'indev' and 'outdev' could not be same " |
| 297 | "for filter redirector"); |
| 298 | return; |
| 299 | } |
| 300 | } |
| 301 | |
| 302 | net_socket_rs_init(&s->rs, redirector_rs_finalize, s->vnet_hdr); |
| 303 | |
| 304 | if (s->indev) { |
| 305 | chr = qemu_chr_find(s->indev); |
| 306 | if (chr == NULL) { |
| 307 | error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, |
| 308 | "IN Device '%s' not found", s->indev); |
| 309 | return; |
| 310 | } |
| 311 | |
| 312 | if (!qemu_chr_fe_init(&s->chr_in, chr, errp)) { |
| 313 | return; |
| 314 | } |
| 315 | |
| 316 | if (nf->on) { |
| 317 | qemu_chr_fe_set_handlers(&s->chr_in, redirector_chr_can_read, |
| 318 | redirector_chr_read, redirector_chr_event, |
| 319 | NULL, nf, NULL, true); |
| 320 | } |
| 321 | } |
| 322 | |
| 323 | if (s->outdev) { |
| 324 | chr = qemu_chr_find(s->outdev); |
| 325 | if (chr == NULL) { |
| 326 | error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND, |
| 327 | "OUT Device '%s' not found", s->outdev); |
| 328 | return; |
| 329 | } |
| 330 | if (!qemu_chr_fe_init(&s->chr_out, chr, errp)) { |
| 331 | return; |
| 332 | } |
| 333 | } |
| 334 | } |
| 335 | |
| 336 | static void filter_redirector_status_changed(NetFilterState *nf, Error **errp) |
| 337 | { |
| 338 | MirrorState *s = FILTER_REDIRECTOR(nf); |
| 339 | |
| 340 | if (!s->indev) { |
| 341 | return; |
| 342 | } |
| 343 | |
| 344 | if (nf->on) { |
| 345 | qemu_chr_fe_set_handlers(&s->chr_in, redirector_chr_can_read, |
| 346 | redirector_chr_read, redirector_chr_event, |
| 347 | NULL, nf, NULL, true); |
| 348 | } else { |
| 349 | qemu_chr_fe_set_handlers(&s->chr_in, NULL, NULL, NULL, |
| 350 | NULL, NULL, NULL, true); |
| 351 | } |
| 352 | } |
| 353 | |
| 354 | static char *filter_redirector_get_indev(Object *obj, Error **errp) |
| 355 | { |
| 356 | MirrorState *s = FILTER_REDIRECTOR(obj); |
| 357 | |
| 358 | return g_strdup(s->indev); |
| 359 | } |
| 360 | |
| 361 | static void filter_redirector_set_indev(Object *obj, |
| 362 | const char *value, |
| 363 | Error **errp) |
| 364 | { |
| 365 | MirrorState *s = FILTER_REDIRECTOR(obj); |
| 366 | |
| 367 | g_free(s->indev); |
| 368 | s->indev = g_strdup(value); |
| 369 | } |
| 370 | |
| 371 | static char *filter_mirror_get_outdev(Object *obj, Error **errp) |
| 372 | { |
| 373 | MirrorState *s = FILTER_MIRROR(obj); |
| 374 | |
| 375 | return g_strdup(s->outdev); |
| 376 | } |
| 377 | |
| 378 | static void filter_mirror_set_outdev(Object *obj, |
| 379 | const char *value, |
| 380 | Error **errp) |
| 381 | { |
| 382 | MirrorState *s = FILTER_MIRROR(obj); |
| 383 | |
| 384 | g_free(s->outdev); |
| 385 | s->outdev = g_strdup(value); |
| 386 | if (!s->outdev) { |
| 387 | error_setg(errp, "filter mirror needs 'outdev' " |
| 388 | "property set"); |
| 389 | return; |
| 390 | } |
| 391 | } |
| 392 | |
| 393 | static bool filter_mirror_get_vnet_hdr(Object *obj, Error **errp) |
| 394 | { |
| 395 | MirrorState *s = FILTER_MIRROR(obj); |
| 396 | |
| 397 | return s->vnet_hdr; |
| 398 | } |
| 399 | |
| 400 | static void filter_mirror_set_vnet_hdr(Object *obj, bool value, Error **errp) |
| 401 | { |
| 402 | MirrorState *s = FILTER_MIRROR(obj); |
| 403 | |
| 404 | s->vnet_hdr = value; |
| 405 | } |
| 406 | |
| 407 | static char *filter_redirector_get_outdev(Object *obj, Error **errp) |
| 408 | { |
| 409 | MirrorState *s = FILTER_REDIRECTOR(obj); |
| 410 | |
| 411 | return g_strdup(s->outdev); |
| 412 | } |
| 413 | |
| 414 | static void filter_redirector_set_outdev(Object *obj, |
| 415 | const char *value, |
| 416 | Error **errp) |
| 417 | { |
| 418 | MirrorState *s = FILTER_REDIRECTOR(obj); |
| 419 | |
| 420 | g_free(s->outdev); |
| 421 | s->outdev = g_strdup(value); |
| 422 | } |
| 423 | |
| 424 | static bool filter_redirector_get_vnet_hdr(Object *obj, Error **errp) |
| 425 | { |
| 426 | MirrorState *s = FILTER_REDIRECTOR(obj); |
| 427 | |
| 428 | return s->vnet_hdr; |
| 429 | } |
| 430 | |
| 431 | static void filter_redirector_set_vnet_hdr(Object *obj, |
| 432 | bool value, |
| 433 | Error **errp) |
| 434 | { |
| 435 | MirrorState *s = FILTER_REDIRECTOR(obj); |
| 436 | |
| 437 | s->vnet_hdr = value; |
| 438 | } |
| 439 | |
| 440 | static void filter_mirror_class_init(ObjectClass *oc, const void *data) |
| 441 | { |
| 442 | NetFilterClass *nfc = NETFILTER_CLASS(oc); |
| 443 | |
| 444 | object_class_property_add_str(oc, "outdev", filter_mirror_get_outdev, |
| 445 | filter_mirror_set_outdev); |
| 446 | object_class_property_add_bool(oc, "vnet_hdr_support", |
| 447 | filter_mirror_get_vnet_hdr, |
| 448 | filter_mirror_set_vnet_hdr); |
| 449 | |
| 450 | nfc->setup = filter_mirror_setup; |
| 451 | nfc->cleanup = filter_mirror_cleanup; |
| 452 | nfc->receive_iov = filter_mirror_receive_iov; |
| 453 | } |
| 454 | |
| 455 | static void filter_redirector_class_init(ObjectClass *oc, const void *data) |
| 456 | { |
| 457 | NetFilterClass *nfc = NETFILTER_CLASS(oc); |
| 458 | |
| 459 | object_class_property_add_str(oc, "indev", filter_redirector_get_indev, |
| 460 | filter_redirector_set_indev); |
| 461 | object_class_property_add_str(oc, "outdev", filter_redirector_get_outdev, |
| 462 | filter_redirector_set_outdev); |
| 463 | object_class_property_add_bool(oc, "vnet_hdr_support", |
| 464 | filter_redirector_get_vnet_hdr, |
| 465 | filter_redirector_set_vnet_hdr); |
| 466 | |
| 467 | nfc->setup = filter_redirector_setup; |
| 468 | nfc->cleanup = filter_redirector_cleanup; |
| 469 | nfc->receive_iov = filter_redirector_receive_iov; |
| 470 | nfc->status_changed = filter_redirector_status_changed; |
| 471 | } |
| 472 | |
| 473 | static void filter_mirror_init(Object *obj) |
| 474 | { |
| 475 | MirrorState *s = FILTER_MIRROR(obj); |
| 476 | |
| 477 | s->vnet_hdr = false; |
| 478 | } |
| 479 | |
| 480 | static void filter_redirector_init(Object *obj) |
| 481 | { |
| 482 | MirrorState *s = FILTER_REDIRECTOR(obj); |
| 483 | |
| 484 | s->vnet_hdr = false; |
| 485 | } |
| 486 | |
| 487 | static void filter_mirror_fini(Object *obj) |
| 488 | { |
| 489 | MirrorState *s = FILTER_MIRROR(obj); |
| 490 | |
| 491 | g_free(s->outdev); |
| 492 | } |
| 493 | |
| 494 | static void filter_redirector_fini(Object *obj) |
| 495 | { |
| 496 | MirrorState *s = FILTER_REDIRECTOR(obj); |
| 497 | |
| 498 | g_free(s->indev); |
| 499 | g_free(s->outdev); |
| 500 | } |
| 501 | |
| 502 | static const TypeInfo filter_redirector_info = { |
| 503 | .name = TYPE_FILTER_REDIRECTOR, |
| 504 | .parent = TYPE_NETFILTER, |
| 505 | .class_init = filter_redirector_class_init, |
| 506 | .instance_init = filter_redirector_init, |
| 507 | .instance_finalize = filter_redirector_fini, |
| 508 | .instance_size = sizeof(MirrorState), |
| 509 | }; |
| 510 | |
| 511 | static const TypeInfo filter_mirror_info = { |
| 512 | .name = TYPE_FILTER_MIRROR, |
| 513 | .parent = TYPE_NETFILTER, |
| 514 | .class_init = filter_mirror_class_init, |
| 515 | .instance_init = filter_mirror_init, |
| 516 | .instance_finalize = filter_mirror_fini, |
| 517 | .instance_size = sizeof(MirrorState), |
| 518 | }; |
| 519 | |
| 520 | static void register_types(void) |
| 521 | { |
| 522 | type_register_static(&filter_mirror_info); |
| 523 | type_register_static(&filter_redirector_info); |
| 524 | } |
| 525 | |
| 526 | type_init(register_types); |