tests: virtio-9p: rename PCI configuration test
[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 #include "qemu/osdep.h"
25
26 #include "net/net.h"
27 #include "clients.h"
28 #include "hub.h"
29 #include "net/slirp.h"
30 #include "net/eth.h"
31 #include "util.h"
32
33 #include "monitor/monitor.h"
34 #include "qemu-common.h"
35 #include "qemu/help_option.h"
36 #include "qapi/qmp/qerror.h"
37 #include "qemu/error-report.h"
38 #include "qemu/sockets.h"
39 #include "qemu/cutils.h"
40 #include "qemu/config-file.h"
41 #include "qmp-commands.h"
42 #include "hw/qdev.h"
43 #include "qemu/iov.h"
44 #include "qemu/main-loop.h"
45 #include "qapi-visit.h"
46 #include "qapi/opts-visitor.h"
47 #include "sysemu/sysemu.h"
48 #include "net/filter.h"
49 #include "qapi/string-output-visitor.h"
50
51 /* Net bridge is currently not supported for W32. */
52 #if !defined(_WIN32)
53 # define CONFIG_NET_BRIDGE
54 #endif
55
56 static VMChangeStateEntry *net_change_state_entry;
57 static QTAILQ_HEAD(, NetClientState) net_clients;
58
59 const char *host_net_devices[] = {
60 "tap",
61 "socket",
62 "dump",
63 #ifdef CONFIG_NET_BRIDGE
64 "bridge",
65 #endif
66 #ifdef CONFIG_NETMAP
67 "netmap",
68 #endif
69 #ifdef CONFIG_SLIRP
70 "user",
71 #endif
72 #ifdef CONFIG_VDE
73 "vde",
74 #endif
75 "vhost-user",
76 NULL,
77 };
78
79 /***********************************************************/
80 /* network device redirectors */
81
82 static int get_str_sep(char *buf, int buf_size, const char **pp, int sep)
83 {
84 const char *p, *p1;
85 int len;
86 p = *pp;
87 p1 = strchr(p, sep);
88 if (!p1)
89 return -1;
90 len = p1 - p;
91 p1++;
92 if (buf_size > 0) {
93 if (len > buf_size - 1)
94 len = buf_size - 1;
95 memcpy(buf, p, len);
96 buf[len] = '\0';
97 }
98 *pp = p1;
99 return 0;
100 }
101
102 int parse_host_port(struct sockaddr_in *saddr, const char *str)
103 {
104 char buf[512];
105 struct hostent *he;
106 const char *p, *r;
107 int port;
108
109 p = str;
110 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0)
111 return -1;
112 saddr->sin_family = AF_INET;
113 if (buf[0] == '\0') {
114 saddr->sin_addr.s_addr = 0;
115 } else {
116 if (qemu_isdigit(buf[0])) {
117 if (!inet_aton(buf, &saddr->sin_addr))
118 return -1;
119 } else {
120 if ((he = gethostbyname(buf)) == NULL)
121 return - 1;
122 saddr->sin_addr = *(struct in_addr *)he->h_addr;
123 }
124 }
125 port = strtol(p, (char **)&r, 0);
126 if (r == p)
127 return -1;
128 saddr->sin_port = htons(port);
129 return 0;
130 }
131
132 char *qemu_mac_strdup_printf(const uint8_t *macaddr)
133 {
134 return g_strdup_printf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x",
135 macaddr[0], macaddr[1], macaddr[2],
136 macaddr[3], macaddr[4], macaddr[5]);
137 }
138
139 void qemu_format_nic_info_str(NetClientState *nc, uint8_t macaddr[6])
140 {
141 snprintf(nc->info_str, sizeof(nc->info_str),
142 "model=%s,macaddr=%02x:%02x:%02x:%02x:%02x:%02x",
143 nc->model,
144 macaddr[0], macaddr[1], macaddr[2],
145 macaddr[3], macaddr[4], macaddr[5]);
146 }
147
148 static int mac_table[256] = {0};
149
150 static void qemu_macaddr_set_used(MACAddr *macaddr)
151 {
152 int index;
153
154 for (index = 0x56; index < 0xFF; index++) {
155 if (macaddr->a[5] == index) {
156 mac_table[index]++;
157 }
158 }
159 }
160
161 static void qemu_macaddr_set_free(MACAddr *macaddr)
162 {
163 int index;
164 static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } };
165
166 if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) {
167 return;
168 }
169 for (index = 0x56; index < 0xFF; index++) {
170 if (macaddr->a[5] == index) {
171 mac_table[index]--;
172 }
173 }
174 }
175
176 static int qemu_macaddr_get_free(void)
177 {
178 int index;
179
180 for (index = 0x56; index < 0xFF; index++) {
181 if (mac_table[index] == 0) {
182 return index;
183 }
184 }
185
186 return -1;
187 }
188
189 void qemu_macaddr_default_if_unset(MACAddr *macaddr)
190 {
191 static const MACAddr zero = { .a = { 0,0,0,0,0,0 } };
192 static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } };
193
194 if (memcmp(macaddr, &zero, sizeof(zero)) != 0) {
195 if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) {
196 return;
197 } else {
198 qemu_macaddr_set_used(macaddr);
199 return;
200 }
201 }
202
203 macaddr->a[0] = 0x52;
204 macaddr->a[1] = 0x54;
205 macaddr->a[2] = 0x00;
206 macaddr->a[3] = 0x12;
207 macaddr->a[4] = 0x34;
208 macaddr->a[5] = qemu_macaddr_get_free();
209 qemu_macaddr_set_used(macaddr);
210 }
211
212 /**
213 * Generate a name for net client
214 *
215 * Only net clients created with the legacy -net option and NICs need this.
216 */
217 static char *assign_name(NetClientState *nc1, const char *model)
218 {
219 NetClientState *nc;
220 int id = 0;
221
222 QTAILQ_FOREACH(nc, &net_clients, next) {
223 if (nc == nc1) {
224 continue;
225 }
226 if (strcmp(nc->model, model) == 0) {
227 id++;
228 }
229 }
230
231 return g_strdup_printf("%s.%d", model, id);
232 }
233
234 static void qemu_net_client_destructor(NetClientState *nc)
235 {
236 g_free(nc);
237 }
238
239 static void qemu_net_client_setup(NetClientState *nc,
240 NetClientInfo *info,
241 NetClientState *peer,
242 const char *model,
243 const char *name,
244 NetClientDestructor *destructor)
245 {
246 nc->info = info;
247 nc->model = g_strdup(model);
248 if (name) {
249 nc->name = g_strdup(name);
250 } else {
251 nc->name = assign_name(nc, model);
252 }
253
254 if (peer) {
255 assert(!peer->peer);
256 nc->peer = peer;
257 peer->peer = nc;
258 }
259 QTAILQ_INSERT_TAIL(&net_clients, nc, next);
260
261 nc->incoming_queue = qemu_new_net_queue(qemu_deliver_packet_iov, nc);
262 nc->destructor = destructor;
263 QTAILQ_INIT(&nc->filters);
264 }
265
266 NetClientState *qemu_new_net_client(NetClientInfo *info,
267 NetClientState *peer,
268 const char *model,
269 const char *name)
270 {
271 NetClientState *nc;
272
273 assert(info->size >= sizeof(NetClientState));
274
275 nc = g_malloc0(info->size);
276 qemu_net_client_setup(nc, info, peer, model, name,
277 qemu_net_client_destructor);
278
279 return nc;
280 }
281
282 NICState *qemu_new_nic(NetClientInfo *info,
283 NICConf *conf,
284 const char *model,
285 const char *name,
286 void *opaque)
287 {
288 NetClientState **peers = conf->peers.ncs;
289 NICState *nic;
290 int i, queues = MAX(1, conf->peers.queues);
291
292 assert(info->type == NET_CLIENT_DRIVER_NIC);
293 assert(info->size >= sizeof(NICState));
294
295 nic = g_malloc0(info->size + sizeof(NetClientState) * queues);
296 nic->ncs = (void *)nic + info->size;
297 nic->conf = conf;
298 nic->opaque = opaque;
299
300 for (i = 0; i < queues; i++) {
301 qemu_net_client_setup(&nic->ncs[i], info, peers[i], model, name,
302 NULL);
303 nic->ncs[i].queue_index = i;
304 }
305
306 return nic;
307 }
308
309 NetClientState *qemu_get_subqueue(NICState *nic, int queue_index)
310 {
311 return nic->ncs + queue_index;
312 }
313
314 NetClientState *qemu_get_queue(NICState *nic)
315 {
316 return qemu_get_subqueue(nic, 0);
317 }
318
319 NICState *qemu_get_nic(NetClientState *nc)
320 {
321 NetClientState *nc0 = nc - nc->queue_index;
322
323 return (NICState *)((void *)nc0 - nc->info->size);
324 }
325
326 void *qemu_get_nic_opaque(NetClientState *nc)
327 {
328 NICState *nic = qemu_get_nic(nc);
329
330 return nic->opaque;
331 }
332
333 static void qemu_cleanup_net_client(NetClientState *nc)
334 {
335 QTAILQ_REMOVE(&net_clients, nc, next);
336
337 if (nc->info->cleanup) {
338 nc->info->cleanup(nc);
339 }
340 }
341
342 static void qemu_free_net_client(NetClientState *nc)
343 {
344 if (nc->incoming_queue) {
345 qemu_del_net_queue(nc->incoming_queue);
346 }
347 if (nc->peer) {
348 nc->peer->peer = NULL;
349 }
350 g_free(nc->name);
351 g_free(nc->model);
352 if (nc->destructor) {
353 nc->destructor(nc);
354 }
355 }
356
357 void qemu_del_net_client(NetClientState *nc)
358 {
359 NetClientState *ncs[MAX_QUEUE_NUM];
360 int queues, i;
361 NetFilterState *nf, *next;
362
363 assert(nc->info->type != NET_CLIENT_DRIVER_NIC);
364
365 /* If the NetClientState belongs to a multiqueue backend, we will change all
366 * other NetClientStates also.
367 */
368 queues = qemu_find_net_clients_except(nc->name, ncs,
369 NET_CLIENT_DRIVER_NIC,
370 MAX_QUEUE_NUM);
371 assert(queues != 0);
372
373 QTAILQ_FOREACH_SAFE(nf, &nc->filters, next, next) {
374 object_unparent(OBJECT(nf));
375 }
376
377 /* If there is a peer NIC, delete and cleanup client, but do not free. */
378 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_NIC) {
379 NICState *nic = qemu_get_nic(nc->peer);
380 if (nic->peer_deleted) {
381 return;
382 }
383 nic->peer_deleted = true;
384
385 for (i = 0; i < queues; i++) {
386 ncs[i]->peer->link_down = true;
387 }
388
389 if (nc->peer->info->link_status_changed) {
390 nc->peer->info->link_status_changed(nc->peer);
391 }
392
393 for (i = 0; i < queues; i++) {
394 qemu_cleanup_net_client(ncs[i]);
395 }
396
397 return;
398 }
399
400 for (i = 0; i < queues; i++) {
401 qemu_cleanup_net_client(ncs[i]);
402 qemu_free_net_client(ncs[i]);
403 }
404 }
405
406 void qemu_del_nic(NICState *nic)
407 {
408 int i, queues = MAX(nic->conf->peers.queues, 1);
409
410 qemu_macaddr_set_free(&nic->conf->macaddr);
411
412 /* If this is a peer NIC and peer has already been deleted, free it now. */
413 if (nic->peer_deleted) {
414 for (i = 0; i < queues; i++) {
415 qemu_free_net_client(qemu_get_subqueue(nic, i)->peer);
416 }
417 }
418
419 for (i = queues - 1; i >= 0; i--) {
420 NetClientState *nc = qemu_get_subqueue(nic, i);
421
422 qemu_cleanup_net_client(nc);
423 qemu_free_net_client(nc);
424 }
425
426 g_free(nic);
427 }
428
429 void qemu_foreach_nic(qemu_nic_foreach func, void *opaque)
430 {
431 NetClientState *nc;
432
433 QTAILQ_FOREACH(nc, &net_clients, next) {
434 if (nc->info->type == NET_CLIENT_DRIVER_NIC) {
435 if (nc->queue_index == 0) {
436 func(qemu_get_nic(nc), opaque);
437 }
438 }
439 }
440 }
441
442 bool qemu_has_ufo(NetClientState *nc)
443 {
444 if (!nc || !nc->info->has_ufo) {
445 return false;
446 }
447
448 return nc->info->has_ufo(nc);
449 }
450
451 bool qemu_has_vnet_hdr(NetClientState *nc)
452 {
453 if (!nc || !nc->info->has_vnet_hdr) {
454 return false;
455 }
456
457 return nc->info->has_vnet_hdr(nc);
458 }
459
460 bool qemu_has_vnet_hdr_len(NetClientState *nc, int len)
461 {
462 if (!nc || !nc->info->has_vnet_hdr_len) {
463 return false;
464 }
465
466 return nc->info->has_vnet_hdr_len(nc, len);
467 }
468
469 void qemu_using_vnet_hdr(NetClientState *nc, bool enable)
470 {
471 if (!nc || !nc->info->using_vnet_hdr) {
472 return;
473 }
474
475 nc->info->using_vnet_hdr(nc, enable);
476 }
477
478 void qemu_set_offload(NetClientState *nc, int csum, int tso4, int tso6,
479 int ecn, int ufo)
480 {
481 if (!nc || !nc->info->set_offload) {
482 return;
483 }
484
485 nc->info->set_offload(nc, csum, tso4, tso6, ecn, ufo);
486 }
487
488 void qemu_set_vnet_hdr_len(NetClientState *nc, int len)
489 {
490 if (!nc || !nc->info->set_vnet_hdr_len) {
491 return;
492 }
493
494 nc->info->set_vnet_hdr_len(nc, len);
495 }
496
497 int qemu_set_vnet_le(NetClientState *nc, bool is_le)
498 {
499 #ifdef HOST_WORDS_BIGENDIAN
500 if (!nc || !nc->info->set_vnet_le) {
501 return -ENOSYS;
502 }
503
504 return nc->info->set_vnet_le(nc, is_le);
505 #else
506 return 0;
507 #endif
508 }
509
510 int qemu_set_vnet_be(NetClientState *nc, bool is_be)
511 {
512 #ifdef HOST_WORDS_BIGENDIAN
513 return 0;
514 #else
515 if (!nc || !nc->info->set_vnet_be) {
516 return -ENOSYS;
517 }
518
519 return nc->info->set_vnet_be(nc, is_be);
520 #endif
521 }
522
523 int qemu_can_send_packet(NetClientState *sender)
524 {
525 int vm_running = runstate_is_running();
526
527 if (!vm_running) {
528 return 0;
529 }
530
531 if (!sender->peer) {
532 return 1;
533 }
534
535 if (sender->peer->receive_disabled) {
536 return 0;
537 } else if (sender->peer->info->can_receive &&
538 !sender->peer->info->can_receive(sender->peer)) {
539 return 0;
540 }
541 return 1;
542 }
543
544 static ssize_t filter_receive_iov(NetClientState *nc,
545 NetFilterDirection direction,
546 NetClientState *sender,
547 unsigned flags,
548 const struct iovec *iov,
549 int iovcnt,
550 NetPacketSent *sent_cb)
551 {
552 ssize_t ret = 0;
553 NetFilterState *nf = NULL;
554
555 if (direction == NET_FILTER_DIRECTION_TX) {
556 QTAILQ_FOREACH(nf, &nc->filters, next) {
557 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov,
558 iovcnt, sent_cb);
559 if (ret) {
560 return ret;
561 }
562 }
563 } else {
564 QTAILQ_FOREACH_REVERSE(nf, &nc->filters, NetFilterHead, next) {
565 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov,
566 iovcnt, sent_cb);
567 if (ret) {
568 return ret;
569 }
570 }
571 }
572
573 return ret;
574 }
575
576 static ssize_t filter_receive(NetClientState *nc,
577 NetFilterDirection direction,
578 NetClientState *sender,
579 unsigned flags,
580 const uint8_t *data,
581 size_t size,
582 NetPacketSent *sent_cb)
583 {
584 struct iovec iov = {
585 .iov_base = (void *)data,
586 .iov_len = size
587 };
588
589 return filter_receive_iov(nc, direction, sender, flags, &iov, 1, sent_cb);
590 }
591
592 void qemu_purge_queued_packets(NetClientState *nc)
593 {
594 if (!nc->peer) {
595 return;
596 }
597
598 qemu_net_queue_purge(nc->peer->incoming_queue, nc);
599 }
600
601 static
602 void qemu_flush_or_purge_queued_packets(NetClientState *nc, bool purge)
603 {
604 nc->receive_disabled = 0;
605
606 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_HUBPORT) {
607 if (net_hub_flush(nc->peer)) {
608 qemu_notify_event();
609 }
610 }
611 if (qemu_net_queue_flush(nc->incoming_queue)) {
612 /* We emptied the queue successfully, signal to the IO thread to repoll
613 * the file descriptor (for tap, for example).
614 */
615 qemu_notify_event();
616 } else if (purge) {
617 /* Unable to empty the queue, purge remaining packets */
618 qemu_net_queue_purge(nc->incoming_queue, nc);
619 }
620 }
621
622 void qemu_flush_queued_packets(NetClientState *nc)
623 {
624 qemu_flush_or_purge_queued_packets(nc, false);
625 }
626
627 static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender,
628 unsigned flags,
629 const uint8_t *buf, int size,
630 NetPacketSent *sent_cb)
631 {
632 NetQueue *queue;
633 int ret;
634
635 #ifdef DEBUG_NET
636 printf("qemu_send_packet_async:\n");
637 qemu_hexdump((const char *)buf, stdout, "net", size);
638 #endif
639
640 if (sender->link_down || !sender->peer) {
641 return size;
642 }
643
644 /* Let filters handle the packet first */
645 ret = filter_receive(sender, NET_FILTER_DIRECTION_TX,
646 sender, flags, buf, size, sent_cb);
647 if (ret) {
648 return ret;
649 }
650
651 ret = filter_receive(sender->peer, NET_FILTER_DIRECTION_RX,
652 sender, flags, buf, size, sent_cb);
653 if (ret) {
654 return ret;
655 }
656
657 queue = sender->peer->incoming_queue;
658
659 return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb);
660 }
661
662 ssize_t qemu_send_packet_async(NetClientState *sender,
663 const uint8_t *buf, int size,
664 NetPacketSent *sent_cb)
665 {
666 return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE,
667 buf, size, sent_cb);
668 }
669
670 void qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size)
671 {
672 qemu_send_packet_async(nc, buf, size, NULL);
673 }
674
675 ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size)
676 {
677 return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW,
678 buf, size, NULL);
679 }
680
681 static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov,
682 int iovcnt, unsigned flags)
683 {
684 uint8_t *buf = NULL;
685 uint8_t *buffer;
686 size_t offset;
687 ssize_t ret;
688
689 if (iovcnt == 1) {
690 buffer = iov[0].iov_base;
691 offset = iov[0].iov_len;
692 } else {
693 offset = iov_size(iov, iovcnt);
694 if (offset > NET_BUFSIZE) {
695 return -1;
696 }
697 buf = g_malloc(offset);
698 buffer = buf;
699 offset = iov_to_buf(iov, iovcnt, 0, buf, offset);
700 }
701
702 if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) {
703 ret = nc->info->receive_raw(nc, buffer, offset);
704 } else {
705 ret = nc->info->receive(nc, buffer, offset);
706 }
707
708 g_free(buf);
709 return ret;
710 }
711
712 ssize_t qemu_deliver_packet_iov(NetClientState *sender,
713 unsigned flags,
714 const struct iovec *iov,
715 int iovcnt,
716 void *opaque)
717 {
718 NetClientState *nc = opaque;
719 int ret;
720
721 if (nc->link_down) {
722 return iov_size(iov, iovcnt);
723 }
724
725 if (nc->receive_disabled) {
726 return 0;
727 }
728
729 if (nc->info->receive_iov && !(flags & QEMU_NET_PACKET_FLAG_RAW)) {
730 ret = nc->info->receive_iov(nc, iov, iovcnt);
731 } else {
732 ret = nc_sendv_compat(nc, iov, iovcnt, flags);
733 }
734
735 if (ret == 0) {
736 nc->receive_disabled = 1;
737 }
738
739 return ret;
740 }
741
742 ssize_t qemu_sendv_packet_async(NetClientState *sender,
743 const struct iovec *iov, int iovcnt,
744 NetPacketSent *sent_cb)
745 {
746 NetQueue *queue;
747 int ret;
748
749 if (sender->link_down || !sender->peer) {
750 return iov_size(iov, iovcnt);
751 }
752
753 /* Let filters handle the packet first */
754 ret = filter_receive_iov(sender, NET_FILTER_DIRECTION_TX, sender,
755 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb);
756 if (ret) {
757 return ret;
758 }
759
760 ret = filter_receive_iov(sender->peer, NET_FILTER_DIRECTION_RX, sender,
761 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb);
762 if (ret) {
763 return ret;
764 }
765
766 queue = sender->peer->incoming_queue;
767
768 return qemu_net_queue_send_iov(queue, sender,
769 QEMU_NET_PACKET_FLAG_NONE,
770 iov, iovcnt, sent_cb);
771 }
772
773 ssize_t
774 qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt)
775 {
776 return qemu_sendv_packet_async(nc, iov, iovcnt, NULL);
777 }
778
779 NetClientState *qemu_find_netdev(const char *id)
780 {
781 NetClientState *nc;
782
783 QTAILQ_FOREACH(nc, &net_clients, next) {
784 if (nc->info->type == NET_CLIENT_DRIVER_NIC)
785 continue;
786 if (!strcmp(nc->name, id)) {
787 return nc;
788 }
789 }
790
791 return NULL;
792 }
793
794 int qemu_find_net_clients_except(const char *id, NetClientState **ncs,
795 NetClientDriver type, int max)
796 {
797 NetClientState *nc;
798 int ret = 0;
799
800 QTAILQ_FOREACH(nc, &net_clients, next) {
801 if (nc->info->type == type) {
802 continue;
803 }
804 if (!id || !strcmp(nc->name, id)) {
805 if (ret < max) {
806 ncs[ret] = nc;
807 }
808 ret++;
809 }
810 }
811
812 return ret;
813 }
814
815 static int nic_get_free_idx(void)
816 {
817 int index;
818
819 for (index = 0; index < MAX_NICS; index++)
820 if (!nd_table[index].used)
821 return index;
822 return -1;
823 }
824
825 int qemu_show_nic_models(const char *arg, const char *const *models)
826 {
827 int i;
828
829 if (!arg || !is_help_option(arg)) {
830 return 0;
831 }
832
833 fprintf(stderr, "qemu: Supported NIC models: ");
834 for (i = 0 ; models[i]; i++)
835 fprintf(stderr, "%s%c", models[i], models[i+1] ? ',' : '\n');
836 return 1;
837 }
838
839 void qemu_check_nic_model(NICInfo *nd, const char *model)
840 {
841 const char *models[2];
842
843 models[0] = model;
844 models[1] = NULL;
845
846 if (qemu_show_nic_models(nd->model, models))
847 exit(0);
848 if (qemu_find_nic_model(nd, models, model) < 0)
849 exit(1);
850 }
851
852 int qemu_find_nic_model(NICInfo *nd, const char * const *models,
853 const char *default_model)
854 {
855 int i;
856
857 if (!nd->model)
858 nd->model = g_strdup(default_model);
859
860 for (i = 0 ; models[i]; i++) {
861 if (strcmp(nd->model, models[i]) == 0)
862 return i;
863 }
864
865 error_report("Unsupported NIC model: %s", nd->model);
866 return -1;
867 }
868
869 static int net_init_nic(const Netdev *netdev, const char *name,
870 NetClientState *peer, Error **errp)
871 {
872 int idx;
873 NICInfo *nd;
874 const NetLegacyNicOptions *nic;
875
876 assert(netdev->type == NET_CLIENT_DRIVER_NIC);
877 nic = &netdev->u.nic;
878
879 idx = nic_get_free_idx();
880 if (idx == -1 || nb_nics >= MAX_NICS) {
881 error_setg(errp, "too many NICs");
882 return -1;
883 }
884
885 nd = &nd_table[idx];
886
887 memset(nd, 0, sizeof(*nd));
888
889 if (nic->has_netdev) {
890 nd->netdev = qemu_find_netdev(nic->netdev);
891 if (!nd->netdev) {
892 error_setg(errp, "netdev '%s' not found", nic->netdev);
893 return -1;
894 }
895 } else {
896 assert(peer);
897 nd->netdev = peer;
898 }
899 nd->name = g_strdup(name);
900 if (nic->has_model) {
901 nd->model = g_strdup(nic->model);
902 }
903 if (nic->has_addr) {
904 nd->devaddr = g_strdup(nic->addr);
905 }
906
907 if (nic->has_macaddr &&
908 net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) {
909 error_setg(errp, "invalid syntax for ethernet address");
910 return -1;
911 }
912 if (nic->has_macaddr &&
913 is_multicast_ether_addr(nd->macaddr.a)) {
914 error_setg(errp,
915 "NIC cannot have multicast MAC address (odd 1st byte)");
916 return -1;
917 }
918 qemu_macaddr_default_if_unset(&nd->macaddr);
919
920 if (nic->has_vectors) {
921 if (nic->vectors > 0x7ffffff) {
922 error_setg(errp, "invalid # of vectors: %"PRIu32, nic->vectors);
923 return -1;
924 }
925 nd->nvectors = nic->vectors;
926 } else {
927 nd->nvectors = DEV_NVECTORS_UNSPECIFIED;
928 }
929
930 nd->used = 1;
931 nb_nics++;
932
933 return idx;
934 }
935
936
937 static int (* const net_client_init_fun[NET_CLIENT_DRIVER__MAX])(
938 const Netdev *netdev,
939 const char *name,
940 NetClientState *peer, Error **errp) = {
941 [NET_CLIENT_DRIVER_NIC] = net_init_nic,
942 #ifdef CONFIG_SLIRP
943 [NET_CLIENT_DRIVER_USER] = net_init_slirp,
944 #endif
945 [NET_CLIENT_DRIVER_TAP] = net_init_tap,
946 [NET_CLIENT_DRIVER_SOCKET] = net_init_socket,
947 #ifdef CONFIG_VDE
948 [NET_CLIENT_DRIVER_VDE] = net_init_vde,
949 #endif
950 #ifdef CONFIG_NETMAP
951 [NET_CLIENT_DRIVER_NETMAP] = net_init_netmap,
952 #endif
953 [NET_CLIENT_DRIVER_DUMP] = net_init_dump,
954 #ifdef CONFIG_NET_BRIDGE
955 [NET_CLIENT_DRIVER_BRIDGE] = net_init_bridge,
956 #endif
957 [NET_CLIENT_DRIVER_HUBPORT] = net_init_hubport,
958 #ifdef CONFIG_VHOST_NET_USED
959 [NET_CLIENT_DRIVER_VHOST_USER] = net_init_vhost_user,
960 #endif
961 #ifdef CONFIG_L2TPV3
962 [NET_CLIENT_DRIVER_L2TPV3] = net_init_l2tpv3,
963 #endif
964 };
965
966
967 static int net_client_init1(const void *object, bool is_netdev, Error **errp)
968 {
969 Netdev legacy = {0};
970 const Netdev *netdev;
971 const char *name;
972 NetClientState *peer = NULL;
973
974 if (is_netdev) {
975 netdev = object;
976 name = netdev->id;
977
978 if (netdev->type == NET_CLIENT_DRIVER_DUMP ||
979 netdev->type == NET_CLIENT_DRIVER_NIC ||
980 !net_client_init_fun[netdev->type]) {
981 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
982 "a netdev backend type");
983 return -1;
984 }
985 } else {
986 const NetLegacy *net = object;
987 const NetLegacyOptions *opts = net->opts;
988 legacy.id = net->id;
989 netdev = &legacy;
990 /* missing optional values have been initialized to "all bits zero" */
991 name = net->has_id ? net->id : net->name;
992
993 /* Map the old options to the new flat type */
994 switch (opts->type) {
995 case NET_LEGACY_OPTIONS_KIND_NONE:
996 return 0; /* nothing to do */
997 case NET_LEGACY_OPTIONS_KIND_NIC:
998 legacy.type = NET_CLIENT_DRIVER_NIC;
999 legacy.u.nic = *opts->u.nic.data;
1000 break;
1001 case NET_LEGACY_OPTIONS_KIND_USER:
1002 legacy.type = NET_CLIENT_DRIVER_USER;
1003 legacy.u.user = *opts->u.user.data;
1004 break;
1005 case NET_LEGACY_OPTIONS_KIND_TAP:
1006 legacy.type = NET_CLIENT_DRIVER_TAP;
1007 legacy.u.tap = *opts->u.tap.data;
1008 break;
1009 case NET_LEGACY_OPTIONS_KIND_L2TPV3:
1010 legacy.type = NET_CLIENT_DRIVER_L2TPV3;
1011 legacy.u.l2tpv3 = *opts->u.l2tpv3.data;
1012 break;
1013 case NET_LEGACY_OPTIONS_KIND_SOCKET:
1014 legacy.type = NET_CLIENT_DRIVER_SOCKET;
1015 legacy.u.socket = *opts->u.socket.data;
1016 break;
1017 case NET_LEGACY_OPTIONS_KIND_VDE:
1018 legacy.type = NET_CLIENT_DRIVER_VDE;
1019 legacy.u.vde = *opts->u.vde.data;
1020 break;
1021 case NET_LEGACY_OPTIONS_KIND_DUMP:
1022 legacy.type = NET_CLIENT_DRIVER_DUMP;
1023 legacy.u.dump = *opts->u.dump.data;
1024 break;
1025 case NET_LEGACY_OPTIONS_KIND_BRIDGE:
1026 legacy.type = NET_CLIENT_DRIVER_BRIDGE;
1027 legacy.u.bridge = *opts->u.bridge.data;
1028 break;
1029 case NET_LEGACY_OPTIONS_KIND_NETMAP:
1030 legacy.type = NET_CLIENT_DRIVER_NETMAP;
1031 legacy.u.netmap = *opts->u.netmap.data;
1032 break;
1033 case NET_LEGACY_OPTIONS_KIND_VHOST_USER:
1034 legacy.type = NET_CLIENT_DRIVER_VHOST_USER;
1035 legacy.u.vhost_user = *opts->u.vhost_user.data;
1036 break;
1037 default:
1038 abort();
1039 }
1040
1041 if (!net_client_init_fun[netdev->type]) {
1042 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
1043 "a net backend type (maybe it is not compiled "
1044 "into this binary)");
1045 return -1;
1046 }
1047
1048 /* Do not add to a vlan if it's a nic with a netdev= parameter. */
1049 if (netdev->type != NET_CLIENT_DRIVER_NIC ||
1050 !opts->u.nic.data->has_netdev) {
1051 peer = net_hub_add_port(net->has_vlan ? net->vlan : 0, NULL);
1052 }
1053 }
1054
1055 if (net_client_init_fun[netdev->type](netdev, name, peer, errp) < 0) {
1056 /* FIXME drop when all init functions store an Error */
1057 if (errp && !*errp) {
1058 error_setg(errp, QERR_DEVICE_INIT_FAILED,
1059 NetClientDriver_lookup[netdev->type]);
1060 }
1061 return -1;
1062 }
1063 return 0;
1064 }
1065
1066
1067 int net_client_init(QemuOpts *opts, bool is_netdev, Error **errp)
1068 {
1069 void *object = NULL;
1070 Error *err = NULL;
1071 int ret = -1;
1072 Visitor *v = opts_visitor_new(opts);
1073
1074 {
1075 /* Parse convenience option format ip6-net=fec0::0[/64] */
1076 const char *ip6_net = qemu_opt_get(opts, "ipv6-net");
1077
1078 if (ip6_net) {
1079 char buf[strlen(ip6_net) + 1];
1080
1081 if (get_str_sep(buf, sizeof(buf), &ip6_net, '/') < 0) {
1082 /* Default 64bit prefix length. */
1083 qemu_opt_set(opts, "ipv6-prefix", ip6_net, &error_abort);
1084 qemu_opt_set_number(opts, "ipv6-prefixlen", 64, &error_abort);
1085 } else {
1086 /* User-specified prefix length. */
1087 unsigned long len;
1088 int err;
1089
1090 qemu_opt_set(opts, "ipv6-prefix", buf, &error_abort);
1091 err = qemu_strtoul(ip6_net, NULL, 10, &len);
1092
1093 if (err) {
1094 error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1095 "ipv6-prefix", "a number");
1096 } else {
1097 qemu_opt_set_number(opts, "ipv6-prefixlen", len,
1098 &error_abort);
1099 }
1100 }
1101 qemu_opt_unset(opts, "ipv6-net");
1102 }
1103 }
1104
1105 if (is_netdev) {
1106 visit_type_Netdev(v, NULL, (Netdev **)&object, &err);
1107 } else {
1108 visit_type_NetLegacy(v, NULL, (NetLegacy **)&object, &err);
1109 }
1110
1111 if (!err) {
1112 ret = net_client_init1(object, is_netdev, &err);
1113 }
1114
1115 if (is_netdev) {
1116 qapi_free_Netdev(object);
1117 } else {
1118 qapi_free_NetLegacy(object);
1119 }
1120
1121 error_propagate(errp, err);
1122 visit_free(v);
1123 return ret;
1124 }
1125
1126
1127 static int net_host_check_device(const char *device)
1128 {
1129 int i;
1130 for (i = 0; host_net_devices[i]; i++) {
1131 if (!strncmp(host_net_devices[i], device,
1132 strlen(host_net_devices[i]))) {
1133 return 1;
1134 }
1135 }
1136
1137 return 0;
1138 }
1139
1140 void hmp_host_net_add(Monitor *mon, const QDict *qdict)
1141 {
1142 const char *device = qdict_get_str(qdict, "device");
1143 const char *opts_str = qdict_get_try_str(qdict, "opts");
1144 Error *local_err = NULL;
1145 QemuOpts *opts;
1146
1147 if (!net_host_check_device(device)) {
1148 monitor_printf(mon, "invalid host network device %s\n", device);
1149 return;
1150 }
1151
1152 opts = qemu_opts_parse_noisily(qemu_find_opts("net"),
1153 opts_str ? opts_str : "", false);
1154 if (!opts) {
1155 return;
1156 }
1157
1158 qemu_opt_set(opts, "type", device, &error_abort);
1159
1160 net_client_init(opts, false, &local_err);
1161 if (local_err) {
1162 error_report_err(local_err);
1163 monitor_printf(mon, "adding host network device %s failed\n", device);
1164 }
1165 }
1166
1167 void hmp_host_net_remove(Monitor *mon, const QDict *qdict)
1168 {
1169 NetClientState *nc;
1170 int vlan_id = qdict_get_int(qdict, "vlan_id");
1171 const char *device = qdict_get_str(qdict, "device");
1172
1173 nc = net_hub_find_client_by_name(vlan_id, device);
1174 if (!nc) {
1175 error_report("Host network device '%s' on hub '%d' not found",
1176 device, vlan_id);
1177 return;
1178 }
1179 if (nc->info->type == NET_CLIENT_DRIVER_NIC) {
1180 error_report("invalid host network device '%s'", device);
1181 return;
1182 }
1183
1184 qemu_del_net_client(nc->peer);
1185 qemu_del_net_client(nc);
1186 qemu_opts_del(qemu_opts_find(qemu_find_opts("net"), device));
1187 }
1188
1189 void netdev_add(QemuOpts *opts, Error **errp)
1190 {
1191 net_client_init(opts, true, errp);
1192 }
1193
1194 void qmp_netdev_add(QDict *qdict, QObject **ret, Error **errp)
1195 {
1196 Error *local_err = NULL;
1197 QemuOptsList *opts_list;
1198 QemuOpts *opts;
1199
1200 opts_list = qemu_find_opts_err("netdev", &local_err);
1201 if (local_err) {
1202 goto out;
1203 }
1204
1205 opts = qemu_opts_from_qdict(opts_list, qdict, &local_err);
1206 if (local_err) {
1207 goto out;
1208 }
1209
1210 netdev_add(opts, &local_err);
1211 if (local_err) {
1212 qemu_opts_del(opts);
1213 goto out;
1214 }
1215
1216 out:
1217 error_propagate(errp, local_err);
1218 }
1219
1220 void qmp_netdev_del(const char *id, Error **errp)
1221 {
1222 NetClientState *nc;
1223 QemuOpts *opts;
1224
1225 nc = qemu_find_netdev(id);
1226 if (!nc) {
1227 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1228 "Device '%s' not found", id);
1229 return;
1230 }
1231
1232 opts = qemu_opts_find(qemu_find_opts_err("netdev", NULL), id);
1233 if (!opts) {
1234 error_setg(errp, "Device '%s' is not a netdev", id);
1235 return;
1236 }
1237
1238 qemu_del_net_client(nc);
1239 qemu_opts_del(opts);
1240 }
1241
1242 static void netfilter_print_info(Monitor *mon, NetFilterState *nf)
1243 {
1244 char *str;
1245 ObjectProperty *prop;
1246 ObjectPropertyIterator iter;
1247 Visitor *v;
1248
1249 /* generate info str */
1250 object_property_iter_init(&iter, OBJECT(nf));
1251 while ((prop = object_property_iter_next(&iter))) {
1252 if (!strcmp(prop->name, "type")) {
1253 continue;
1254 }
1255 v = string_output_visitor_new(false, &str);
1256 object_property_get(OBJECT(nf), v, prop->name, NULL);
1257 visit_complete(v, &str);
1258 visit_free(v);
1259 monitor_printf(mon, ",%s=%s", prop->name, str);
1260 g_free(str);
1261 }
1262 monitor_printf(mon, "\n");
1263 }
1264
1265 void print_net_client(Monitor *mon, NetClientState *nc)
1266 {
1267 NetFilterState *nf;
1268
1269 monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name,
1270 nc->queue_index,
1271 NetClientDriver_lookup[nc->info->type],
1272 nc->info_str);
1273 if (!QTAILQ_EMPTY(&nc->filters)) {
1274 monitor_printf(mon, "filters:\n");
1275 }
1276 QTAILQ_FOREACH(nf, &nc->filters, next) {
1277 char *path = object_get_canonical_path_component(OBJECT(nf));
1278
1279 monitor_printf(mon, " - %s: type=%s", path,
1280 object_get_typename(OBJECT(nf)));
1281 netfilter_print_info(mon, nf);
1282 g_free(path);
1283 }
1284 }
1285
1286 RxFilterInfoList *qmp_query_rx_filter(bool has_name, const char *name,
1287 Error **errp)
1288 {
1289 NetClientState *nc;
1290 RxFilterInfoList *filter_list = NULL, *last_entry = NULL;
1291
1292 QTAILQ_FOREACH(nc, &net_clients, next) {
1293 RxFilterInfoList *entry;
1294 RxFilterInfo *info;
1295
1296 if (has_name && strcmp(nc->name, name) != 0) {
1297 continue;
1298 }
1299
1300 /* only query rx-filter information of NIC */
1301 if (nc->info->type != NET_CLIENT_DRIVER_NIC) {
1302 if (has_name) {
1303 error_setg(errp, "net client(%s) isn't a NIC", name);
1304 return NULL;
1305 }
1306 continue;
1307 }
1308
1309 /* only query information on queue 0 since the info is per nic,
1310 * not per queue
1311 */
1312 if (nc->queue_index != 0)
1313 continue;
1314
1315 if (nc->info->query_rx_filter) {
1316 info = nc->info->query_rx_filter(nc);
1317 entry = g_malloc0(sizeof(*entry));
1318 entry->value = info;
1319
1320 if (!filter_list) {
1321 filter_list = entry;
1322 } else {
1323 last_entry->next = entry;
1324 }
1325 last_entry = entry;
1326 } else if (has_name) {
1327 error_setg(errp, "net client(%s) doesn't support"
1328 " rx-filter querying", name);
1329 return NULL;
1330 }
1331
1332 if (has_name) {
1333 break;
1334 }
1335 }
1336
1337 if (filter_list == NULL && has_name) {
1338 error_setg(errp, "invalid net client name: %s", name);
1339 }
1340
1341 return filter_list;
1342 }
1343
1344 void hmp_info_network(Monitor *mon, const QDict *qdict)
1345 {
1346 NetClientState *nc, *peer;
1347 NetClientDriver type;
1348
1349 net_hub_info(mon);
1350
1351 QTAILQ_FOREACH(nc, &net_clients, next) {
1352 peer = nc->peer;
1353 type = nc->info->type;
1354
1355 /* Skip if already printed in hub info */
1356 if (net_hub_id_for_client(nc, NULL) == 0) {
1357 continue;
1358 }
1359
1360 if (!peer || type == NET_CLIENT_DRIVER_NIC) {
1361 print_net_client(mon, nc);
1362 } /* else it's a netdev connected to a NIC, printed with the NIC */
1363 if (peer && type == NET_CLIENT_DRIVER_NIC) {
1364 monitor_printf(mon, " \\ ");
1365 print_net_client(mon, peer);
1366 }
1367 }
1368 }
1369
1370 void qmp_set_link(const char *name, bool up, Error **errp)
1371 {
1372 NetClientState *ncs[MAX_QUEUE_NUM];
1373 NetClientState *nc;
1374 int queues, i;
1375
1376 queues = qemu_find_net_clients_except(name, ncs,
1377 NET_CLIENT_DRIVER__MAX,
1378 MAX_QUEUE_NUM);
1379
1380 if (queues == 0) {
1381 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1382 "Device '%s' not found", name);
1383 return;
1384 }
1385 nc = ncs[0];
1386
1387 for (i = 0; i < queues; i++) {
1388 ncs[i]->link_down = !up;
1389 }
1390
1391 if (nc->info->link_status_changed) {
1392 nc->info->link_status_changed(nc);
1393 }
1394
1395 if (nc->peer) {
1396 /* Change peer link only if the peer is NIC and then notify peer.
1397 * If the peer is a HUBPORT or a backend, we do not change the
1398 * link status.
1399 *
1400 * This behavior is compatible with qemu vlans where there could be
1401 * multiple clients that can still communicate with each other in
1402 * disconnected mode. For now maintain this compatibility.
1403 */
1404 if (nc->peer->info->type == NET_CLIENT_DRIVER_NIC) {
1405 for (i = 0; i < queues; i++) {
1406 ncs[i]->peer->link_down = !up;
1407 }
1408 }
1409 if (nc->peer->info->link_status_changed) {
1410 nc->peer->info->link_status_changed(nc->peer);
1411 }
1412 }
1413 }
1414
1415 static void net_vm_change_state_handler(void *opaque, int running,
1416 RunState state)
1417 {
1418 NetClientState *nc;
1419 NetClientState *tmp;
1420
1421 QTAILQ_FOREACH_SAFE(nc, &net_clients, next, tmp) {
1422 if (running) {
1423 /* Flush queued packets and wake up backends. */
1424 if (nc->peer && qemu_can_send_packet(nc)) {
1425 qemu_flush_queued_packets(nc->peer);
1426 }
1427 } else {
1428 /* Complete all queued packets, to guarantee we don't modify
1429 * state later when VM is not running.
1430 */
1431 qemu_flush_or_purge_queued_packets(nc, true);
1432 }
1433 }
1434 }
1435
1436 void net_cleanup(void)
1437 {
1438 NetClientState *nc;
1439
1440 /* We may del multiple entries during qemu_del_net_client(),
1441 * so QTAILQ_FOREACH_SAFE() is also not safe here.
1442 */
1443 while (!QTAILQ_EMPTY(&net_clients)) {
1444 nc = QTAILQ_FIRST(&net_clients);
1445 if (nc->info->type == NET_CLIENT_DRIVER_NIC) {
1446 qemu_del_nic(qemu_get_nic(nc));
1447 } else {
1448 qemu_del_net_client(nc);
1449 }
1450 }
1451
1452 qemu_del_vm_change_state_handler(net_change_state_entry);
1453 }
1454
1455 void net_check_clients(void)
1456 {
1457 NetClientState *nc;
1458 int i;
1459
1460 net_hub_check_clients();
1461
1462 QTAILQ_FOREACH(nc, &net_clients, next) {
1463 if (!nc->peer) {
1464 fprintf(stderr, "Warning: %s %s has no peer\n",
1465 nc->info->type == NET_CLIENT_DRIVER_NIC ?
1466 "nic" : "netdev", nc->name);
1467 }
1468 }
1469
1470 /* Check that all NICs requested via -net nic actually got created.
1471 * NICs created via -device don't need to be checked here because
1472 * they are always instantiated.
1473 */
1474 for (i = 0; i < MAX_NICS; i++) {
1475 NICInfo *nd = &nd_table[i];
1476 if (nd->used && !nd->instantiated) {
1477 fprintf(stderr, "Warning: requested NIC (%s, model %s) "
1478 "was not created (not supported by this machine?)\n",
1479 nd->name ? nd->name : "anonymous",
1480 nd->model ? nd->model : "unspecified");
1481 }
1482 }
1483 }
1484
1485 static int net_init_client(void *dummy, QemuOpts *opts, Error **errp)
1486 {
1487 Error *local_err = NULL;
1488
1489 net_client_init(opts, false, &local_err);
1490 if (local_err) {
1491 error_report_err(local_err);
1492 return -1;
1493 }
1494
1495 return 0;
1496 }
1497
1498 static int net_init_netdev(void *dummy, QemuOpts *opts, Error **errp)
1499 {
1500 Error *local_err = NULL;
1501 int ret;
1502
1503 ret = net_client_init(opts, true, &local_err);
1504 if (local_err) {
1505 error_report_err(local_err);
1506 return -1;
1507 }
1508
1509 return ret;
1510 }
1511
1512 int net_init_clients(void)
1513 {
1514 QemuOptsList *net = qemu_find_opts("net");
1515
1516 net_change_state_entry =
1517 qemu_add_vm_change_state_handler(net_vm_change_state_handler, NULL);
1518
1519 QTAILQ_INIT(&net_clients);
1520
1521 if (qemu_opts_foreach(qemu_find_opts("netdev"),
1522 net_init_netdev, NULL, NULL)) {
1523 return -1;
1524 }
1525
1526 if (qemu_opts_foreach(net, net_init_client, NULL, NULL)) {
1527 return -1;
1528 }
1529
1530 return 0;
1531 }
1532
1533 int net_client_parse(QemuOptsList *opts_list, const char *optarg)
1534 {
1535 #if defined(CONFIG_SLIRP)
1536 int ret;
1537 if (net_slirp_parse_legacy(opts_list, optarg, &ret)) {
1538 return ret;
1539 }
1540 #endif
1541
1542 if (!qemu_opts_parse_noisily(opts_list, optarg, true)) {
1543 return -1;
1544 }
1545
1546 return 0;
1547 }
1548
1549 /* From FreeBSD */
1550 /* XXX: optimize */
1551 unsigned compute_mcast_idx(const uint8_t *ep)
1552 {
1553 uint32_t crc;
1554 int carry, i, j;
1555 uint8_t b;
1556
1557 crc = 0xffffffff;
1558 for (i = 0; i < 6; i++) {
1559 b = *ep++;
1560 for (j = 0; j < 8; j++) {
1561 carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01);
1562 crc <<= 1;
1563 b >>= 1;
1564 if (carry) {
1565 crc = ((crc ^ POLYNOMIAL) | carry);
1566 }
1567 }
1568 }
1569 return crc >> 26;
1570 }
1571
1572 QemuOptsList qemu_netdev_opts = {
1573 .name = "netdev",
1574 .implied_opt_name = "type",
1575 .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head),
1576 .desc = {
1577 /*
1578 * no elements => accept any params
1579 * validation will happen later
1580 */
1581 { /* end of list */ }
1582 },
1583 };
1584
1585 QemuOptsList qemu_net_opts = {
1586 .name = "net",
1587 .implied_opt_name = "type",
1588 .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head),
1589 .desc = {
1590 /*
1591 * no elements => accept any params
1592 * validation will happen later
1593 */
1594 { /* end of list */ }
1595 },
1596 };
1597
1598 void net_socket_rs_init(SocketReadState *rs,
1599 SocketReadStateFinalize *finalize)
1600 {
1601 rs->state = 0;
1602 rs->index = 0;
1603 rs->packet_len = 0;
1604 memset(rs->buf, 0, sizeof(rs->buf));
1605 rs->finalize = finalize;
1606 }
1607
1608 /*
1609 * Returns
1610 * 0: success
1611 * -1: error occurs
1612 */
1613 int net_fill_rstate(SocketReadState *rs, const uint8_t *buf, int size)
1614 {
1615 unsigned int l;
1616
1617 while (size > 0) {
1618 /* reassemble a packet from the network */
1619 switch (rs->state) { /* 0 = getting length, 1 = getting data */
1620 case 0:
1621 l = 4 - rs->index;
1622 if (l > size) {
1623 l = size;
1624 }
1625 memcpy(rs->buf + rs->index, buf, l);
1626 buf += l;
1627 size -= l;
1628 rs->index += l;
1629 if (rs->index == 4) {
1630 /* got length */
1631 rs->packet_len = ntohl(*(uint32_t *)rs->buf);
1632 rs->index = 0;
1633 rs->state = 1;
1634 }
1635 break;
1636 case 1:
1637 l = rs->packet_len - rs->index;
1638 if (l > size) {
1639 l = size;
1640 }
1641 if (rs->index + l <= sizeof(rs->buf)) {
1642 memcpy(rs->buf + rs->index, buf, l);
1643 } else {
1644 fprintf(stderr, "serious error: oversized packet received,"
1645 "connection terminated.\n");
1646 rs->index = rs->state = 0;
1647 return -1;
1648 }
1649
1650 rs->index += l;
1651 buf += l;
1652 size -= l;
1653 if (rs->index >= rs->packet_len) {
1654 rs->index = 0;
1655 rs->state = 0;
1656 assert(rs->finalize);
1657 rs->finalize(rs);
1658 }
1659 break;
1660 }
1661 }
1662
1663 assert(size == 0);
1664 return 0;
1665 }