tests/acpi: add new unit test to test hotplug off/on feature on the root pci bus
[qemu.git] / net / net.c
1 /*
2 * QEMU System Emulator
3 *
4 * Copyright (c) 2003-2008 Fabrice Bellard
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22 * THE SOFTWARE.
23 */
24
25 #include "qemu/osdep.h"
26
27 #include "net/net.h"
28 #include "clients.h"
29 #include "hub.h"
30 #include "hw/qdev-properties.h"
31 #include "net/slirp.h"
32 #include "net/eth.h"
33 #include "util.h"
34
35 #include "monitor/monitor.h"
36 #include "qemu/help_option.h"
37 #include "qapi/qapi-commands-net.h"
38 #include "qapi/qapi-visit-net.h"
39 #include "qapi/qmp/qdict.h"
40 #include "qapi/qmp/qerror.h"
41 #include "qemu/error-report.h"
42 #include "qemu/sockets.h"
43 #include "qemu/cutils.h"
44 #include "qemu/config-file.h"
45 #include "qemu/ctype.h"
46 #include "qemu/iov.h"
47 #include "qemu/main-loop.h"
48 #include "qemu/option.h"
49 #include "qapi/error.h"
50 #include "qapi/opts-visitor.h"
51 #include "sysemu/sysemu.h"
52 #include "sysemu/qtest.h"
53 #include "sysemu/runstate.h"
54 #include "sysemu/sysemu.h"
55 #include "net/filter.h"
56 #include "qapi/string-output-visitor.h"
57
58 /* Net bridge is currently not supported for W32. */
59 #if !defined(_WIN32)
60 # define CONFIG_NET_BRIDGE
61 #endif
62
63 static VMChangeStateEntry *net_change_state_entry;
64 static QTAILQ_HEAD(, NetClientState) net_clients;
65
66 /***********************************************************/
67 /* network device redirectors */
68
69 int parse_host_port(struct sockaddr_in *saddr, const char *str,
70 Error **errp)
71 {
72 gchar **substrings;
73 struct hostent *he;
74 const char *addr, *p, *r;
75 int port, ret = 0;
76
77 substrings = g_strsplit(str, ":", 2);
78 if (!substrings || !substrings[0] || !substrings[1]) {
79 error_setg(errp, "host address '%s' doesn't contain ':' "
80 "separating host from port", str);
81 ret = -1;
82 goto out;
83 }
84
85 addr = substrings[0];
86 p = substrings[1];
87
88 saddr->sin_family = AF_INET;
89 if (addr[0] == '\0') {
90 saddr->sin_addr.s_addr = 0;
91 } else {
92 if (qemu_isdigit(addr[0])) {
93 if (!inet_aton(addr, &saddr->sin_addr)) {
94 error_setg(errp, "host address '%s' is not a valid "
95 "IPv4 address", addr);
96 ret = -1;
97 goto out;
98 }
99 } else {
100 he = gethostbyname(addr);
101 if (he == NULL) {
102 error_setg(errp, "can't resolve host address '%s'", addr);
103 ret = -1;
104 goto out;
105 }
106 saddr->sin_addr = *(struct in_addr *)he->h_addr;
107 }
108 }
109 port = strtol(p, (char **)&r, 0);
110 if (r == p) {
111 error_setg(errp, "port number '%s' is invalid", p);
112 ret = -1;
113 goto out;
114 }
115 saddr->sin_port = htons(port);
116
117 out:
118 g_strfreev(substrings);
119 return ret;
120 }
121
122 char *qemu_mac_strdup_printf(const uint8_t *macaddr)
123 {
124 return g_strdup_printf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x",
125 macaddr[0], macaddr[1], macaddr[2],
126 macaddr[3], macaddr[4], macaddr[5]);
127 }
128
129 void qemu_format_nic_info_str(NetClientState *nc, uint8_t macaddr[6])
130 {
131 snprintf(nc->info_str, sizeof(nc->info_str),
132 "model=%s,macaddr=%02x:%02x:%02x:%02x:%02x:%02x",
133 nc->model,
134 macaddr[0], macaddr[1], macaddr[2],
135 macaddr[3], macaddr[4], macaddr[5]);
136 }
137
138 static int mac_table[256] = {0};
139
140 static void qemu_macaddr_set_used(MACAddr *macaddr)
141 {
142 int index;
143
144 for (index = 0x56; index < 0xFF; index++) {
145 if (macaddr->a[5] == index) {
146 mac_table[index]++;
147 }
148 }
149 }
150
151 static void qemu_macaddr_set_free(MACAddr *macaddr)
152 {
153 int index;
154 static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } };
155
156 if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) {
157 return;
158 }
159 for (index = 0x56; index < 0xFF; index++) {
160 if (macaddr->a[5] == index) {
161 mac_table[index]--;
162 }
163 }
164 }
165
166 static int qemu_macaddr_get_free(void)
167 {
168 int index;
169
170 for (index = 0x56; index < 0xFF; index++) {
171 if (mac_table[index] == 0) {
172 return index;
173 }
174 }
175
176 return -1;
177 }
178
179 void qemu_macaddr_default_if_unset(MACAddr *macaddr)
180 {
181 static const MACAddr zero = { .a = { 0,0,0,0,0,0 } };
182 static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } };
183
184 if (memcmp(macaddr, &zero, sizeof(zero)) != 0) {
185 if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) {
186 return;
187 } else {
188 qemu_macaddr_set_used(macaddr);
189 return;
190 }
191 }
192
193 macaddr->a[0] = 0x52;
194 macaddr->a[1] = 0x54;
195 macaddr->a[2] = 0x00;
196 macaddr->a[3] = 0x12;
197 macaddr->a[4] = 0x34;
198 macaddr->a[5] = qemu_macaddr_get_free();
199 qemu_macaddr_set_used(macaddr);
200 }
201
202 /**
203 * Generate a name for net client
204 *
205 * Only net clients created with the legacy -net option and NICs need this.
206 */
207 static char *assign_name(NetClientState *nc1, const char *model)
208 {
209 NetClientState *nc;
210 int id = 0;
211
212 QTAILQ_FOREACH(nc, &net_clients, next) {
213 if (nc == nc1) {
214 continue;
215 }
216 if (strcmp(nc->model, model) == 0) {
217 id++;
218 }
219 }
220
221 return g_strdup_printf("%s.%d", model, id);
222 }
223
224 static void qemu_net_client_destructor(NetClientState *nc)
225 {
226 g_free(nc);
227 }
228 static ssize_t qemu_deliver_packet_iov(NetClientState *sender,
229 unsigned flags,
230 const struct iovec *iov,
231 int iovcnt,
232 void *opaque);
233
234 static void qemu_net_client_setup(NetClientState *nc,
235 NetClientInfo *info,
236 NetClientState *peer,
237 const char *model,
238 const char *name,
239 NetClientDestructor *destructor)
240 {
241 nc->info = info;
242 nc->model = g_strdup(model);
243 if (name) {
244 nc->name = g_strdup(name);
245 } else {
246 nc->name = assign_name(nc, model);
247 }
248
249 if (peer) {
250 assert(!peer->peer);
251 nc->peer = peer;
252 peer->peer = nc;
253 }
254 QTAILQ_INSERT_TAIL(&net_clients, nc, next);
255
256 nc->incoming_queue = qemu_new_net_queue(qemu_deliver_packet_iov, nc);
257 nc->destructor = destructor;
258 QTAILQ_INIT(&nc->filters);
259 }
260
261 NetClientState *qemu_new_net_client(NetClientInfo *info,
262 NetClientState *peer,
263 const char *model,
264 const char *name)
265 {
266 NetClientState *nc;
267
268 assert(info->size >= sizeof(NetClientState));
269
270 nc = g_malloc0(info->size);
271 qemu_net_client_setup(nc, info, peer, model, name,
272 qemu_net_client_destructor);
273
274 return nc;
275 }
276
277 NICState *qemu_new_nic(NetClientInfo *info,
278 NICConf *conf,
279 const char *model,
280 const char *name,
281 void *opaque)
282 {
283 NetClientState **peers = conf->peers.ncs;
284 NICState *nic;
285 int i, queues = MAX(1, conf->peers.queues);
286
287 assert(info->type == NET_CLIENT_DRIVER_NIC);
288 assert(info->size >= sizeof(NICState));
289
290 nic = g_malloc0(info->size + sizeof(NetClientState) * queues);
291 nic->ncs = (void *)nic + info->size;
292 nic->conf = conf;
293 nic->opaque = opaque;
294
295 for (i = 0; i < queues; i++) {
296 qemu_net_client_setup(&nic->ncs[i], info, peers[i], model, name,
297 NULL);
298 nic->ncs[i].queue_index = i;
299 }
300
301 return nic;
302 }
303
304 NetClientState *qemu_get_subqueue(NICState *nic, int queue_index)
305 {
306 return nic->ncs + queue_index;
307 }
308
309 NetClientState *qemu_get_queue(NICState *nic)
310 {
311 return qemu_get_subqueue(nic, 0);
312 }
313
314 NICState *qemu_get_nic(NetClientState *nc)
315 {
316 NetClientState *nc0 = nc - nc->queue_index;
317
318 return (NICState *)((void *)nc0 - nc->info->size);
319 }
320
321 void *qemu_get_nic_opaque(NetClientState *nc)
322 {
323 NICState *nic = qemu_get_nic(nc);
324
325 return nic->opaque;
326 }
327
328 NetClientState *qemu_get_peer(NetClientState *nc, int queue_index)
329 {
330 assert(nc != NULL);
331 NetClientState *ncs = nc + queue_index;
332 return ncs->peer;
333 }
334
335 static void qemu_cleanup_net_client(NetClientState *nc)
336 {
337 QTAILQ_REMOVE(&net_clients, nc, next);
338
339 if (nc->info->cleanup) {
340 nc->info->cleanup(nc);
341 }
342 }
343
344 static void qemu_free_net_client(NetClientState *nc)
345 {
346 if (nc->incoming_queue) {
347 qemu_del_net_queue(nc->incoming_queue);
348 }
349 if (nc->peer) {
350 nc->peer->peer = NULL;
351 }
352 g_free(nc->name);
353 g_free(nc->model);
354 if (nc->destructor) {
355 nc->destructor(nc);
356 }
357 }
358
359 void qemu_del_net_client(NetClientState *nc)
360 {
361 NetClientState *ncs[MAX_QUEUE_NUM];
362 int queues, i;
363 NetFilterState *nf, *next;
364
365 assert(nc->info->type != NET_CLIENT_DRIVER_NIC);
366
367 /* If the NetClientState belongs to a multiqueue backend, we will change all
368 * other NetClientStates also.
369 */
370 queues = qemu_find_net_clients_except(nc->name, ncs,
371 NET_CLIENT_DRIVER_NIC,
372 MAX_QUEUE_NUM);
373 assert(queues != 0);
374
375 QTAILQ_FOREACH_SAFE(nf, &nc->filters, next, next) {
376 object_unparent(OBJECT(nf));
377 }
378
379 /* If there is a peer NIC, delete and cleanup client, but do not free. */
380 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_NIC) {
381 NICState *nic = qemu_get_nic(nc->peer);
382 if (nic->peer_deleted) {
383 return;
384 }
385 nic->peer_deleted = true;
386
387 for (i = 0; i < queues; i++) {
388 ncs[i]->peer->link_down = true;
389 }
390
391 if (nc->peer->info->link_status_changed) {
392 nc->peer->info->link_status_changed(nc->peer);
393 }
394
395 for (i = 0; i < queues; i++) {
396 qemu_cleanup_net_client(ncs[i]);
397 }
398
399 return;
400 }
401
402 for (i = 0; i < queues; i++) {
403 qemu_cleanup_net_client(ncs[i]);
404 qemu_free_net_client(ncs[i]);
405 }
406 }
407
408 void qemu_del_nic(NICState *nic)
409 {
410 int i, queues = MAX(nic->conf->peers.queues, 1);
411
412 qemu_macaddr_set_free(&nic->conf->macaddr);
413
414 /* If this is a peer NIC and peer has already been deleted, free it now. */
415 if (nic->peer_deleted) {
416 for (i = 0; i < queues; i++) {
417 qemu_free_net_client(qemu_get_subqueue(nic, i)->peer);
418 }
419 }
420
421 for (i = queues - 1; i >= 0; i--) {
422 NetClientState *nc = qemu_get_subqueue(nic, i);
423
424 qemu_cleanup_net_client(nc);
425 qemu_free_net_client(nc);
426 }
427
428 g_free(nic);
429 }
430
431 void qemu_foreach_nic(qemu_nic_foreach func, void *opaque)
432 {
433 NetClientState *nc;
434
435 QTAILQ_FOREACH(nc, &net_clients, next) {
436 if (nc->info->type == NET_CLIENT_DRIVER_NIC) {
437 if (nc->queue_index == 0) {
438 func(qemu_get_nic(nc), opaque);
439 }
440 }
441 }
442 }
443
444 bool qemu_has_ufo(NetClientState *nc)
445 {
446 if (!nc || !nc->info->has_ufo) {
447 return false;
448 }
449
450 return nc->info->has_ufo(nc);
451 }
452
453 bool qemu_has_vnet_hdr(NetClientState *nc)
454 {
455 if (!nc || !nc->info->has_vnet_hdr) {
456 return false;
457 }
458
459 return nc->info->has_vnet_hdr(nc);
460 }
461
462 bool qemu_has_vnet_hdr_len(NetClientState *nc, int len)
463 {
464 if (!nc || !nc->info->has_vnet_hdr_len) {
465 return false;
466 }
467
468 return nc->info->has_vnet_hdr_len(nc, len);
469 }
470
471 void qemu_using_vnet_hdr(NetClientState *nc, bool enable)
472 {
473 if (!nc || !nc->info->using_vnet_hdr) {
474 return;
475 }
476
477 nc->info->using_vnet_hdr(nc, enable);
478 }
479
480 void qemu_set_offload(NetClientState *nc, int csum, int tso4, int tso6,
481 int ecn, int ufo)
482 {
483 if (!nc || !nc->info->set_offload) {
484 return;
485 }
486
487 nc->info->set_offload(nc, csum, tso4, tso6, ecn, ufo);
488 }
489
490 void qemu_set_vnet_hdr_len(NetClientState *nc, int len)
491 {
492 if (!nc || !nc->info->set_vnet_hdr_len) {
493 return;
494 }
495
496 nc->vnet_hdr_len = len;
497 nc->info->set_vnet_hdr_len(nc, len);
498 }
499
500 int qemu_set_vnet_le(NetClientState *nc, bool is_le)
501 {
502 #ifdef HOST_WORDS_BIGENDIAN
503 if (!nc || !nc->info->set_vnet_le) {
504 return -ENOSYS;
505 }
506
507 return nc->info->set_vnet_le(nc, is_le);
508 #else
509 return 0;
510 #endif
511 }
512
513 int qemu_set_vnet_be(NetClientState *nc, bool is_be)
514 {
515 #ifdef HOST_WORDS_BIGENDIAN
516 return 0;
517 #else
518 if (!nc || !nc->info->set_vnet_be) {
519 return -ENOSYS;
520 }
521
522 return nc->info->set_vnet_be(nc, is_be);
523 #endif
524 }
525
526 int qemu_can_send_packet(NetClientState *sender)
527 {
528 int vm_running = runstate_is_running();
529
530 if (!vm_running) {
531 return 0;
532 }
533
534 if (!sender->peer) {
535 return 1;
536 }
537
538 if (sender->peer->receive_disabled) {
539 return 0;
540 } else if (sender->peer->info->can_receive &&
541 !sender->peer->info->can_receive(sender->peer)) {
542 return 0;
543 }
544 return 1;
545 }
546
547 static ssize_t filter_receive_iov(NetClientState *nc,
548 NetFilterDirection direction,
549 NetClientState *sender,
550 unsigned flags,
551 const struct iovec *iov,
552 int iovcnt,
553 NetPacketSent *sent_cb)
554 {
555 ssize_t ret = 0;
556 NetFilterState *nf = NULL;
557
558 if (direction == NET_FILTER_DIRECTION_TX) {
559 QTAILQ_FOREACH(nf, &nc->filters, next) {
560 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov,
561 iovcnt, sent_cb);
562 if (ret) {
563 return ret;
564 }
565 }
566 } else {
567 QTAILQ_FOREACH_REVERSE(nf, &nc->filters, next) {
568 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov,
569 iovcnt, sent_cb);
570 if (ret) {
571 return ret;
572 }
573 }
574 }
575
576 return ret;
577 }
578
579 static ssize_t filter_receive(NetClientState *nc,
580 NetFilterDirection direction,
581 NetClientState *sender,
582 unsigned flags,
583 const uint8_t *data,
584 size_t size,
585 NetPacketSent *sent_cb)
586 {
587 struct iovec iov = {
588 .iov_base = (void *)data,
589 .iov_len = size
590 };
591
592 return filter_receive_iov(nc, direction, sender, flags, &iov, 1, sent_cb);
593 }
594
595 void qemu_purge_queued_packets(NetClientState *nc)
596 {
597 if (!nc->peer) {
598 return;
599 }
600
601 qemu_net_queue_purge(nc->peer->incoming_queue, nc);
602 }
603
604 void qemu_flush_or_purge_queued_packets(NetClientState *nc, bool purge)
605 {
606 nc->receive_disabled = 0;
607
608 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_HUBPORT) {
609 if (net_hub_flush(nc->peer)) {
610 qemu_notify_event();
611 }
612 }
613 if (qemu_net_queue_flush(nc->incoming_queue)) {
614 /* We emptied the queue successfully, signal to the IO thread to repoll
615 * the file descriptor (for tap, for example).
616 */
617 qemu_notify_event();
618 } else if (purge) {
619 /* Unable to empty the queue, purge remaining packets */
620 qemu_net_queue_purge(nc->incoming_queue, nc->peer);
621 }
622 }
623
624 void qemu_flush_queued_packets(NetClientState *nc)
625 {
626 qemu_flush_or_purge_queued_packets(nc, false);
627 }
628
629 static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender,
630 unsigned flags,
631 const uint8_t *buf, int size,
632 NetPacketSent *sent_cb)
633 {
634 NetQueue *queue;
635 int ret;
636
637 #ifdef DEBUG_NET
638 printf("qemu_send_packet_async:\n");
639 qemu_hexdump(stdout, "net", buf, size);
640 #endif
641
642 if (sender->link_down || !sender->peer) {
643 return size;
644 }
645
646 /* Let filters handle the packet first */
647 ret = filter_receive(sender, NET_FILTER_DIRECTION_TX,
648 sender, flags, buf, size, sent_cb);
649 if (ret) {
650 return ret;
651 }
652
653 ret = filter_receive(sender->peer, NET_FILTER_DIRECTION_RX,
654 sender, flags, buf, size, sent_cb);
655 if (ret) {
656 return ret;
657 }
658
659 queue = sender->peer->incoming_queue;
660
661 return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb);
662 }
663
664 ssize_t qemu_send_packet_async(NetClientState *sender,
665 const uint8_t *buf, int size,
666 NetPacketSent *sent_cb)
667 {
668 return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE,
669 buf, size, sent_cb);
670 }
671
672 ssize_t qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size)
673 {
674 return qemu_send_packet_async(nc, buf, size, NULL);
675 }
676
677 ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size)
678 {
679 return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW,
680 buf, size, NULL);
681 }
682
683 static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov,
684 int iovcnt, unsigned flags)
685 {
686 uint8_t *buf = NULL;
687 uint8_t *buffer;
688 size_t offset;
689 ssize_t ret;
690
691 if (iovcnt == 1) {
692 buffer = iov[0].iov_base;
693 offset = iov[0].iov_len;
694 } else {
695 offset = iov_size(iov, iovcnt);
696 if (offset > NET_BUFSIZE) {
697 return -1;
698 }
699 buf = g_malloc(offset);
700 buffer = buf;
701 offset = iov_to_buf(iov, iovcnt, 0, buf, offset);
702 }
703
704 if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) {
705 ret = nc->info->receive_raw(nc, buffer, offset);
706 } else {
707 ret = nc->info->receive(nc, buffer, offset);
708 }
709
710 g_free(buf);
711 return ret;
712 }
713
714 static ssize_t qemu_deliver_packet_iov(NetClientState *sender,
715 unsigned flags,
716 const struct iovec *iov,
717 int iovcnt,
718 void *opaque)
719 {
720 NetClientState *nc = opaque;
721 int ret;
722
723
724 if (nc->link_down) {
725 return iov_size(iov, iovcnt);
726 }
727
728 if (nc->receive_disabled) {
729 return 0;
730 }
731
732 if (nc->info->receive_iov && !(flags & QEMU_NET_PACKET_FLAG_RAW)) {
733 ret = nc->info->receive_iov(nc, iov, iovcnt);
734 } else {
735 ret = nc_sendv_compat(nc, iov, iovcnt, flags);
736 }
737
738 if (ret == 0) {
739 nc->receive_disabled = 1;
740 }
741
742 return ret;
743 }
744
745 ssize_t qemu_sendv_packet_async(NetClientState *sender,
746 const struct iovec *iov, int iovcnt,
747 NetPacketSent *sent_cb)
748 {
749 NetQueue *queue;
750 size_t size = iov_size(iov, iovcnt);
751 int ret;
752
753 if (size > NET_BUFSIZE) {
754 return size;
755 }
756
757 if (sender->link_down || !sender->peer) {
758 return size;
759 }
760
761 /* Let filters handle the packet first */
762 ret = filter_receive_iov(sender, NET_FILTER_DIRECTION_TX, sender,
763 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb);
764 if (ret) {
765 return ret;
766 }
767
768 ret = filter_receive_iov(sender->peer, NET_FILTER_DIRECTION_RX, sender,
769 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb);
770 if (ret) {
771 return ret;
772 }
773
774 queue = sender->peer->incoming_queue;
775
776 return qemu_net_queue_send_iov(queue, sender,
777 QEMU_NET_PACKET_FLAG_NONE,
778 iov, iovcnt, sent_cb);
779 }
780
781 ssize_t
782 qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt)
783 {
784 return qemu_sendv_packet_async(nc, iov, iovcnt, NULL);
785 }
786
787 NetClientState *qemu_find_netdev(const char *id)
788 {
789 NetClientState *nc;
790
791 QTAILQ_FOREACH(nc, &net_clients, next) {
792 if (nc->info->type == NET_CLIENT_DRIVER_NIC)
793 continue;
794 if (!strcmp(nc->name, id)) {
795 return nc;
796 }
797 }
798
799 return NULL;
800 }
801
802 int qemu_find_net_clients_except(const char *id, NetClientState **ncs,
803 NetClientDriver type, int max)
804 {
805 NetClientState *nc;
806 int ret = 0;
807
808 QTAILQ_FOREACH(nc, &net_clients, next) {
809 if (nc->info->type == type) {
810 continue;
811 }
812 if (!id || !strcmp(nc->name, id)) {
813 if (ret < max) {
814 ncs[ret] = nc;
815 }
816 ret++;
817 }
818 }
819
820 return ret;
821 }
822
823 static int nic_get_free_idx(void)
824 {
825 int index;
826
827 for (index = 0; index < MAX_NICS; index++)
828 if (!nd_table[index].used)
829 return index;
830 return -1;
831 }
832
833 int qemu_show_nic_models(const char *arg, const char *const *models)
834 {
835 int i;
836
837 if (!arg || !is_help_option(arg)) {
838 return 0;
839 }
840
841 printf("Supported NIC models:\n");
842 for (i = 0 ; models[i]; i++) {
843 printf("%s\n", models[i]);
844 }
845 return 1;
846 }
847
848 void qemu_check_nic_model(NICInfo *nd, const char *model)
849 {
850 const char *models[2];
851
852 models[0] = model;
853 models[1] = NULL;
854
855 if (qemu_show_nic_models(nd->model, models))
856 exit(0);
857 if (qemu_find_nic_model(nd, models, model) < 0)
858 exit(1);
859 }
860
861 int qemu_find_nic_model(NICInfo *nd, const char * const *models,
862 const char *default_model)
863 {
864 int i;
865
866 if (!nd->model)
867 nd->model = g_strdup(default_model);
868
869 for (i = 0 ; models[i]; i++) {
870 if (strcmp(nd->model, models[i]) == 0)
871 return i;
872 }
873
874 error_report("Unsupported NIC model: %s", nd->model);
875 return -1;
876 }
877
878 static int net_init_nic(const Netdev *netdev, const char *name,
879 NetClientState *peer, Error **errp)
880 {
881 int idx;
882 NICInfo *nd;
883 const NetLegacyNicOptions *nic;
884
885 assert(netdev->type == NET_CLIENT_DRIVER_NIC);
886 nic = &netdev->u.nic;
887
888 idx = nic_get_free_idx();
889 if (idx == -1 || nb_nics >= MAX_NICS) {
890 error_setg(errp, "too many NICs");
891 return -1;
892 }
893
894 nd = &nd_table[idx];
895
896 memset(nd, 0, sizeof(*nd));
897
898 if (nic->has_netdev) {
899 nd->netdev = qemu_find_netdev(nic->netdev);
900 if (!nd->netdev) {
901 error_setg(errp, "netdev '%s' not found", nic->netdev);
902 return -1;
903 }
904 } else {
905 assert(peer);
906 nd->netdev = peer;
907 }
908 nd->name = g_strdup(name);
909 if (nic->has_model) {
910 nd->model = g_strdup(nic->model);
911 }
912 if (nic->has_addr) {
913 nd->devaddr = g_strdup(nic->addr);
914 }
915
916 if (nic->has_macaddr &&
917 net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) {
918 error_setg(errp, "invalid syntax for ethernet address");
919 return -1;
920 }
921 if (nic->has_macaddr &&
922 is_multicast_ether_addr(nd->macaddr.a)) {
923 error_setg(errp,
924 "NIC cannot have multicast MAC address (odd 1st byte)");
925 return -1;
926 }
927 qemu_macaddr_default_if_unset(&nd->macaddr);
928
929 if (nic->has_vectors) {
930 if (nic->vectors > 0x7ffffff) {
931 error_setg(errp, "invalid # of vectors: %"PRIu32, nic->vectors);
932 return -1;
933 }
934 nd->nvectors = nic->vectors;
935 } else {
936 nd->nvectors = DEV_NVECTORS_UNSPECIFIED;
937 }
938
939 nd->used = 1;
940 nb_nics++;
941
942 return idx;
943 }
944
945
946 static int (* const net_client_init_fun[NET_CLIENT_DRIVER__MAX])(
947 const Netdev *netdev,
948 const char *name,
949 NetClientState *peer, Error **errp) = {
950 [NET_CLIENT_DRIVER_NIC] = net_init_nic,
951 #ifdef CONFIG_SLIRP
952 [NET_CLIENT_DRIVER_USER] = net_init_slirp,
953 #endif
954 [NET_CLIENT_DRIVER_TAP] = net_init_tap,
955 [NET_CLIENT_DRIVER_SOCKET] = net_init_socket,
956 #ifdef CONFIG_VDE
957 [NET_CLIENT_DRIVER_VDE] = net_init_vde,
958 #endif
959 #ifdef CONFIG_NETMAP
960 [NET_CLIENT_DRIVER_NETMAP] = net_init_netmap,
961 #endif
962 #ifdef CONFIG_NET_BRIDGE
963 [NET_CLIENT_DRIVER_BRIDGE] = net_init_bridge,
964 #endif
965 [NET_CLIENT_DRIVER_HUBPORT] = net_init_hubport,
966 #ifdef CONFIG_VHOST_NET_USER
967 [NET_CLIENT_DRIVER_VHOST_USER] = net_init_vhost_user,
968 #endif
969 #ifdef CONFIG_VHOST_NET_VDPA
970 [NET_CLIENT_DRIVER_VHOST_VDPA] = net_init_vhost_vdpa,
971 #endif
972 #ifdef CONFIG_L2TPV3
973 [NET_CLIENT_DRIVER_L2TPV3] = net_init_l2tpv3,
974 #endif
975 };
976
977
978 static int net_client_init1(const Netdev *netdev, bool is_netdev, Error **errp)
979 {
980 NetClientState *peer = NULL;
981
982 if (is_netdev) {
983 if (netdev->type == NET_CLIENT_DRIVER_NIC ||
984 !net_client_init_fun[netdev->type]) {
985 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
986 "a netdev backend type");
987 return -1;
988 }
989 } else {
990 if (netdev->type == NET_CLIENT_DRIVER_NONE) {
991 return 0; /* nothing to do */
992 }
993 if (netdev->type == NET_CLIENT_DRIVER_HUBPORT ||
994 !net_client_init_fun[netdev->type]) {
995 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
996 "a net backend type (maybe it is not compiled "
997 "into this binary)");
998 return -1;
999 }
1000
1001 /* Do not add to a hub if it's a nic with a netdev= parameter. */
1002 if (netdev->type != NET_CLIENT_DRIVER_NIC ||
1003 !netdev->u.nic.has_netdev) {
1004 peer = net_hub_add_port(0, NULL, NULL);
1005 }
1006 }
1007
1008 if (net_client_init_fun[netdev->type](netdev, netdev->id, peer, errp) < 0) {
1009 /* FIXME drop when all init functions store an Error */
1010 if (errp && !*errp) {
1011 error_setg(errp, QERR_DEVICE_INIT_FAILED,
1012 NetClientDriver_str(netdev->type));
1013 }
1014 return -1;
1015 }
1016
1017 if (is_netdev) {
1018 NetClientState *nc;
1019
1020 nc = qemu_find_netdev(netdev->id);
1021 assert(nc);
1022 nc->is_netdev = true;
1023 }
1024
1025 return 0;
1026 }
1027
1028 static void show_netdevs(void)
1029 {
1030 int idx;
1031 const char *available_netdevs[] = {
1032 "socket",
1033 "hubport",
1034 "tap",
1035 #ifdef CONFIG_SLIRP
1036 "user",
1037 #endif
1038 #ifdef CONFIG_L2TPV3
1039 "l2tpv3",
1040 #endif
1041 #ifdef CONFIG_VDE
1042 "vde",
1043 #endif
1044 #ifdef CONFIG_NET_BRIDGE
1045 "bridge",
1046 #endif
1047 #ifdef CONFIG_NETMAP
1048 "netmap",
1049 #endif
1050 #ifdef CONFIG_POSIX
1051 "vhost-user",
1052 #endif
1053 };
1054
1055 printf("Available netdev backend types:\n");
1056 for (idx = 0; idx < ARRAY_SIZE(available_netdevs); idx++) {
1057 puts(available_netdevs[idx]);
1058 }
1059 }
1060
1061 static int net_client_init(QemuOpts *opts, bool is_netdev, Error **errp)
1062 {
1063 gchar **substrings = NULL;
1064 Netdev *object = NULL;
1065 int ret = -1;
1066 Visitor *v = opts_visitor_new(opts);
1067
1068 const char *type = qemu_opt_get(opts, "type");
1069
1070 if (is_netdev && type && is_help_option(type)) {
1071 show_netdevs();
1072 exit(0);
1073 } else {
1074 /* Parse convenience option format ip6-net=fec0::0[/64] */
1075 const char *ip6_net = qemu_opt_get(opts, "ipv6-net");
1076
1077 if (ip6_net) {
1078 char *prefix_addr;
1079 unsigned long prefix_len = 64; /* Default 64bit prefix length. */
1080
1081 substrings = g_strsplit(ip6_net, "/", 2);
1082 if (!substrings || !substrings[0]) {
1083 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "ipv6-net",
1084 "a valid IPv6 prefix");
1085 goto out;
1086 }
1087
1088 prefix_addr = substrings[0];
1089
1090 /* Handle user-specified prefix length. */
1091 if (substrings[1] &&
1092 qemu_strtoul(substrings[1], NULL, 10, &prefix_len))
1093 {
1094 error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1095 "ipv6-prefixlen", "a number");
1096 goto out;
1097 }
1098
1099 qemu_opt_set(opts, "ipv6-prefix", prefix_addr, &error_abort);
1100 qemu_opt_set_number(opts, "ipv6-prefixlen", prefix_len,
1101 &error_abort);
1102 qemu_opt_unset(opts, "ipv6-net");
1103 }
1104 }
1105
1106 /* Create an ID for -net if the user did not specify one */
1107 if (!is_netdev && !qemu_opts_id(opts)) {
1108 static int idx;
1109 qemu_opts_set_id(opts, g_strdup_printf("__org.qemu.net%i", idx++));
1110 }
1111
1112 if (visit_type_Netdev(v, NULL, &object, errp)) {
1113 ret = net_client_init1(object, is_netdev, errp);
1114 }
1115
1116 qapi_free_Netdev(object);
1117
1118 out:
1119 g_strfreev(substrings);
1120 visit_free(v);
1121 return ret;
1122 }
1123
1124 void netdev_add(QemuOpts *opts, Error **errp)
1125 {
1126 net_client_init(opts, true, errp);
1127 }
1128
1129 void qmp_netdev_add(Netdev *netdev, Error **errp)
1130 {
1131 net_client_init1(netdev, true, errp);
1132 }
1133
1134 void qmp_netdev_del(const char *id, Error **errp)
1135 {
1136 NetClientState *nc;
1137
1138 nc = qemu_find_netdev(id);
1139 if (!nc) {
1140 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1141 "Device '%s' not found", id);
1142 return;
1143 }
1144
1145 if (!nc->is_netdev) {
1146 error_setg(errp, "Device '%s' is not a netdev", id);
1147 return;
1148 }
1149
1150 qemu_del_net_client(nc);
1151 }
1152
1153 static void netfilter_print_info(Monitor *mon, NetFilterState *nf)
1154 {
1155 char *str;
1156 ObjectProperty *prop;
1157 ObjectPropertyIterator iter;
1158 Visitor *v;
1159
1160 /* generate info str */
1161 object_property_iter_init(&iter, OBJECT(nf));
1162 while ((prop = object_property_iter_next(&iter))) {
1163 if (!strcmp(prop->name, "type")) {
1164 continue;
1165 }
1166 v = string_output_visitor_new(false, &str);
1167 object_property_get(OBJECT(nf), prop->name, v, NULL);
1168 visit_complete(v, &str);
1169 visit_free(v);
1170 monitor_printf(mon, ",%s=%s", prop->name, str);
1171 g_free(str);
1172 }
1173 monitor_printf(mon, "\n");
1174 }
1175
1176 void print_net_client(Monitor *mon, NetClientState *nc)
1177 {
1178 NetFilterState *nf;
1179
1180 monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name,
1181 nc->queue_index,
1182 NetClientDriver_str(nc->info->type),
1183 nc->info_str);
1184 if (!QTAILQ_EMPTY(&nc->filters)) {
1185 monitor_printf(mon, "filters:\n");
1186 }
1187 QTAILQ_FOREACH(nf, &nc->filters, next) {
1188 monitor_printf(mon, " - %s: type=%s",
1189 object_get_canonical_path_component(OBJECT(nf)),
1190 object_get_typename(OBJECT(nf)));
1191 netfilter_print_info(mon, nf);
1192 }
1193 }
1194
1195 RxFilterInfoList *qmp_query_rx_filter(bool has_name, const char *name,
1196 Error **errp)
1197 {
1198 NetClientState *nc;
1199 RxFilterInfoList *filter_list = NULL, *last_entry = NULL;
1200
1201 QTAILQ_FOREACH(nc, &net_clients, next) {
1202 RxFilterInfoList *entry;
1203 RxFilterInfo *info;
1204
1205 if (has_name && strcmp(nc->name, name) != 0) {
1206 continue;
1207 }
1208
1209 /* only query rx-filter information of NIC */
1210 if (nc->info->type != NET_CLIENT_DRIVER_NIC) {
1211 if (has_name) {
1212 error_setg(errp, "net client(%s) isn't a NIC", name);
1213 return NULL;
1214 }
1215 continue;
1216 }
1217
1218 /* only query information on queue 0 since the info is per nic,
1219 * not per queue
1220 */
1221 if (nc->queue_index != 0)
1222 continue;
1223
1224 if (nc->info->query_rx_filter) {
1225 info = nc->info->query_rx_filter(nc);
1226 entry = g_malloc0(sizeof(*entry));
1227 entry->value = info;
1228
1229 if (!filter_list) {
1230 filter_list = entry;
1231 } else {
1232 last_entry->next = entry;
1233 }
1234 last_entry = entry;
1235 } else if (has_name) {
1236 error_setg(errp, "net client(%s) doesn't support"
1237 " rx-filter querying", name);
1238 return NULL;
1239 }
1240
1241 if (has_name) {
1242 break;
1243 }
1244 }
1245
1246 if (filter_list == NULL && has_name) {
1247 error_setg(errp, "invalid net client name: %s", name);
1248 }
1249
1250 return filter_list;
1251 }
1252
1253 void hmp_info_network(Monitor *mon, const QDict *qdict)
1254 {
1255 NetClientState *nc, *peer;
1256 NetClientDriver type;
1257
1258 net_hub_info(mon);
1259
1260 QTAILQ_FOREACH(nc, &net_clients, next) {
1261 peer = nc->peer;
1262 type = nc->info->type;
1263
1264 /* Skip if already printed in hub info */
1265 if (net_hub_id_for_client(nc, NULL) == 0) {
1266 continue;
1267 }
1268
1269 if (!peer || type == NET_CLIENT_DRIVER_NIC) {
1270 print_net_client(mon, nc);
1271 } /* else it's a netdev connected to a NIC, printed with the NIC */
1272 if (peer && type == NET_CLIENT_DRIVER_NIC) {
1273 monitor_printf(mon, " \\ ");
1274 print_net_client(mon, peer);
1275 }
1276 }
1277 }
1278
1279 void colo_notify_filters_event(int event, Error **errp)
1280 {
1281 NetClientState *nc;
1282 NetFilterState *nf;
1283 NetFilterClass *nfc = NULL;
1284 Error *local_err = NULL;
1285
1286 QTAILQ_FOREACH(nc, &net_clients, next) {
1287 QTAILQ_FOREACH(nf, &nc->filters, next) {
1288 nfc = NETFILTER_GET_CLASS(OBJECT(nf));
1289 nfc->handle_event(nf, event, &local_err);
1290 if (local_err) {
1291 error_propagate(errp, local_err);
1292 return;
1293 }
1294 }
1295 }
1296 }
1297
1298 void qmp_set_link(const char *name, bool up, Error **errp)
1299 {
1300 NetClientState *ncs[MAX_QUEUE_NUM];
1301 NetClientState *nc;
1302 int queues, i;
1303
1304 queues = qemu_find_net_clients_except(name, ncs,
1305 NET_CLIENT_DRIVER__MAX,
1306 MAX_QUEUE_NUM);
1307
1308 if (queues == 0) {
1309 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1310 "Device '%s' not found", name);
1311 return;
1312 }
1313 nc = ncs[0];
1314
1315 for (i = 0; i < queues; i++) {
1316 ncs[i]->link_down = !up;
1317 }
1318
1319 if (nc->info->link_status_changed) {
1320 nc->info->link_status_changed(nc);
1321 }
1322
1323 if (nc->peer) {
1324 /* Change peer link only if the peer is NIC and then notify peer.
1325 * If the peer is a HUBPORT or a backend, we do not change the
1326 * link status.
1327 *
1328 * This behavior is compatible with qemu hubs where there could be
1329 * multiple clients that can still communicate with each other in
1330 * disconnected mode. For now maintain this compatibility.
1331 */
1332 if (nc->peer->info->type == NET_CLIENT_DRIVER_NIC) {
1333 for (i = 0; i < queues; i++) {
1334 ncs[i]->peer->link_down = !up;
1335 }
1336 }
1337 if (nc->peer->info->link_status_changed) {
1338 nc->peer->info->link_status_changed(nc->peer);
1339 }
1340 }
1341 }
1342
1343 static void net_vm_change_state_handler(void *opaque, int running,
1344 RunState state)
1345 {
1346 NetClientState *nc;
1347 NetClientState *tmp;
1348
1349 QTAILQ_FOREACH_SAFE(nc, &net_clients, next, tmp) {
1350 if (running) {
1351 /* Flush queued packets and wake up backends. */
1352 if (nc->peer && qemu_can_send_packet(nc)) {
1353 qemu_flush_queued_packets(nc->peer);
1354 }
1355 } else {
1356 /* Complete all queued packets, to guarantee we don't modify
1357 * state later when VM is not running.
1358 */
1359 qemu_flush_or_purge_queued_packets(nc, true);
1360 }
1361 }
1362 }
1363
1364 void net_cleanup(void)
1365 {
1366 NetClientState *nc;
1367
1368 /* We may del multiple entries during qemu_del_net_client(),
1369 * so QTAILQ_FOREACH_SAFE() is also not safe here.
1370 */
1371 while (!QTAILQ_EMPTY(&net_clients)) {
1372 nc = QTAILQ_FIRST(&net_clients);
1373 if (nc->info->type == NET_CLIENT_DRIVER_NIC) {
1374 qemu_del_nic(qemu_get_nic(nc));
1375 } else {
1376 qemu_del_net_client(nc);
1377 }
1378 }
1379
1380 qemu_del_vm_change_state_handler(net_change_state_entry);
1381 }
1382
1383 void net_check_clients(void)
1384 {
1385 NetClientState *nc;
1386 int i;
1387
1388 net_hub_check_clients();
1389
1390 QTAILQ_FOREACH(nc, &net_clients, next) {
1391 if (!nc->peer) {
1392 warn_report("%s %s has no peer",
1393 nc->info->type == NET_CLIENT_DRIVER_NIC
1394 ? "nic" : "netdev",
1395 nc->name);
1396 }
1397 }
1398
1399 /* Check that all NICs requested via -net nic actually got created.
1400 * NICs created via -device don't need to be checked here because
1401 * they are always instantiated.
1402 */
1403 for (i = 0; i < MAX_NICS; i++) {
1404 NICInfo *nd = &nd_table[i];
1405 if (nd->used && !nd->instantiated) {
1406 warn_report("requested NIC (%s, model %s) "
1407 "was not created (not supported by this machine?)",
1408 nd->name ? nd->name : "anonymous",
1409 nd->model ? nd->model : "unspecified");
1410 }
1411 }
1412 }
1413
1414 static int net_init_client(void *dummy, QemuOpts *opts, Error **errp)
1415 {
1416 return net_client_init(opts, false, errp);
1417 }
1418
1419 static int net_init_netdev(void *dummy, QemuOpts *opts, Error **errp)
1420 {
1421 return net_client_init(opts, true, errp);
1422 }
1423
1424 /* For the convenience "--nic" parameter */
1425 static int net_param_nic(void *dummy, QemuOpts *opts, Error **errp)
1426 {
1427 char *mac, *nd_id;
1428 int idx, ret;
1429 NICInfo *ni;
1430 const char *type;
1431
1432 type = qemu_opt_get(opts, "type");
1433 if (type && g_str_equal(type, "none")) {
1434 return 0; /* Nothing to do, default_net is cleared in vl.c */
1435 }
1436
1437 idx = nic_get_free_idx();
1438 if (idx == -1 || nb_nics >= MAX_NICS) {
1439 error_setg(errp, "no more on-board/default NIC slots available");
1440 return -1;
1441 }
1442
1443 if (!type) {
1444 qemu_opt_set(opts, "type", "user", &error_abort);
1445 }
1446
1447 ni = &nd_table[idx];
1448 memset(ni, 0, sizeof(*ni));
1449 ni->model = qemu_opt_get_del(opts, "model");
1450
1451 /* Create an ID if the user did not specify one */
1452 nd_id = g_strdup(qemu_opts_id(opts));
1453 if (!nd_id) {
1454 nd_id = g_strdup_printf("__org.qemu.nic%i", idx);
1455 qemu_opts_set_id(opts, nd_id);
1456 }
1457
1458 /* Handle MAC address */
1459 mac = qemu_opt_get_del(opts, "mac");
1460 if (mac) {
1461 ret = net_parse_macaddr(ni->macaddr.a, mac);
1462 g_free(mac);
1463 if (ret) {
1464 error_setg(errp, "invalid syntax for ethernet address");
1465 goto out;
1466 }
1467 if (is_multicast_ether_addr(ni->macaddr.a)) {
1468 error_setg(errp, "NIC cannot have multicast MAC address");
1469 ret = -1;
1470 goto out;
1471 }
1472 }
1473 qemu_macaddr_default_if_unset(&ni->macaddr);
1474
1475 ret = net_client_init(opts, true, errp);
1476 if (ret == 0) {
1477 ni->netdev = qemu_find_netdev(nd_id);
1478 ni->used = true;
1479 nb_nics++;
1480 }
1481
1482 out:
1483 g_free(nd_id);
1484 return ret;
1485 }
1486
1487 int net_init_clients(Error **errp)
1488 {
1489 net_change_state_entry =
1490 qemu_add_vm_change_state_handler(net_vm_change_state_handler, NULL);
1491
1492 QTAILQ_INIT(&net_clients);
1493
1494 if (qemu_opts_foreach(qemu_find_opts("netdev"),
1495 net_init_netdev, NULL, errp)) {
1496 return -1;
1497 }
1498
1499 if (qemu_opts_foreach(qemu_find_opts("nic"), net_param_nic, NULL, errp)) {
1500 return -1;
1501 }
1502
1503 if (qemu_opts_foreach(qemu_find_opts("net"), net_init_client, NULL, errp)) {
1504 return -1;
1505 }
1506
1507 return 0;
1508 }
1509
1510 int net_client_parse(QemuOptsList *opts_list, const char *optarg)
1511 {
1512 if (!qemu_opts_parse_noisily(opts_list, optarg, true)) {
1513 return -1;
1514 }
1515
1516 return 0;
1517 }
1518
1519 /* From FreeBSD */
1520 /* XXX: optimize */
1521 uint32_t net_crc32(const uint8_t *p, int len)
1522 {
1523 uint32_t crc;
1524 int carry, i, j;
1525 uint8_t b;
1526
1527 crc = 0xffffffff;
1528 for (i = 0; i < len; i++) {
1529 b = *p++;
1530 for (j = 0; j < 8; j++) {
1531 carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01);
1532 crc <<= 1;
1533 b >>= 1;
1534 if (carry) {
1535 crc = ((crc ^ POLYNOMIAL_BE) | carry);
1536 }
1537 }
1538 }
1539
1540 return crc;
1541 }
1542
1543 uint32_t net_crc32_le(const uint8_t *p, int len)
1544 {
1545 uint32_t crc;
1546 int carry, i, j;
1547 uint8_t b;
1548
1549 crc = 0xffffffff;
1550 for (i = 0; i < len; i++) {
1551 b = *p++;
1552 for (j = 0; j < 8; j++) {
1553 carry = (crc & 0x1) ^ (b & 0x01);
1554 crc >>= 1;
1555 b >>= 1;
1556 if (carry) {
1557 crc ^= POLYNOMIAL_LE;
1558 }
1559 }
1560 }
1561
1562 return crc;
1563 }
1564
1565 QemuOptsList qemu_netdev_opts = {
1566 .name = "netdev",
1567 .implied_opt_name = "type",
1568 .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head),
1569 .desc = {
1570 /*
1571 * no elements => accept any params
1572 * validation will happen later
1573 */
1574 { /* end of list */ }
1575 },
1576 };
1577
1578 QemuOptsList qemu_nic_opts = {
1579 .name = "nic",
1580 .implied_opt_name = "type",
1581 .head = QTAILQ_HEAD_INITIALIZER(qemu_nic_opts.head),
1582 .desc = {
1583 /*
1584 * no elements => accept any params
1585 * validation will happen later
1586 */
1587 { /* end of list */ }
1588 },
1589 };
1590
1591 QemuOptsList qemu_net_opts = {
1592 .name = "net",
1593 .implied_opt_name = "type",
1594 .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head),
1595 .desc = {
1596 /*
1597 * no elements => accept any params
1598 * validation will happen later
1599 */
1600 { /* end of list */ }
1601 },
1602 };
1603
1604 void net_socket_rs_init(SocketReadState *rs,
1605 SocketReadStateFinalize *finalize,
1606 bool vnet_hdr)
1607 {
1608 rs->state = 0;
1609 rs->vnet_hdr = vnet_hdr;
1610 rs->index = 0;
1611 rs->packet_len = 0;
1612 rs->vnet_hdr_len = 0;
1613 memset(rs->buf, 0, sizeof(rs->buf));
1614 rs->finalize = finalize;
1615 }
1616
1617 /*
1618 * Returns
1619 * 0: success
1620 * -1: error occurs
1621 */
1622 int net_fill_rstate(SocketReadState *rs, const uint8_t *buf, int size)
1623 {
1624 unsigned int l;
1625
1626 while (size > 0) {
1627 /* Reassemble a packet from the network.
1628 * 0 = getting length.
1629 * 1 = getting vnet header length.
1630 * 2 = getting data.
1631 */
1632 switch (rs->state) {
1633 case 0:
1634 l = 4 - rs->index;
1635 if (l > size) {
1636 l = size;
1637 }
1638 memcpy(rs->buf + rs->index, buf, l);
1639 buf += l;
1640 size -= l;
1641 rs->index += l;
1642 if (rs->index == 4) {
1643 /* got length */
1644 rs->packet_len = ntohl(*(uint32_t *)rs->buf);
1645 rs->index = 0;
1646 if (rs->vnet_hdr) {
1647 rs->state = 1;
1648 } else {
1649 rs->state = 2;
1650 rs->vnet_hdr_len = 0;
1651 }
1652 }
1653 break;
1654 case 1:
1655 l = 4 - rs->index;
1656 if (l > size) {
1657 l = size;
1658 }
1659 memcpy(rs->buf + rs->index, buf, l);
1660 buf += l;
1661 size -= l;
1662 rs->index += l;
1663 if (rs->index == 4) {
1664 /* got vnet header length */
1665 rs->vnet_hdr_len = ntohl(*(uint32_t *)rs->buf);
1666 rs->index = 0;
1667 rs->state = 2;
1668 }
1669 break;
1670 case 2:
1671 l = rs->packet_len - rs->index;
1672 if (l > size) {
1673 l = size;
1674 }
1675 if (rs->index + l <= sizeof(rs->buf)) {
1676 memcpy(rs->buf + rs->index, buf, l);
1677 } else {
1678 fprintf(stderr, "serious error: oversized packet received,"
1679 "connection terminated.\n");
1680 rs->index = rs->state = 0;
1681 return -1;
1682 }
1683
1684 rs->index += l;
1685 buf += l;
1686 size -= l;
1687 if (rs->index >= rs->packet_len) {
1688 rs->index = 0;
1689 rs->state = 0;
1690 assert(rs->finalize);
1691 rs->finalize(rs);
1692 }
1693 break;
1694 }
1695 }
1696
1697 assert(size == 0);
1698 return 0;
1699 }