migration: delete QEMUFile stdio implementation
[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 int default_net = 1;
80
81 /***********************************************************/
82 /* network device redirectors */
83
84 static int get_str_sep(char *buf, int buf_size, const char **pp, int sep)
85 {
86 const char *p, *p1;
87 int len;
88 p = *pp;
89 p1 = strchr(p, sep);
90 if (!p1)
91 return -1;
92 len = p1 - p;
93 p1++;
94 if (buf_size > 0) {
95 if (len > buf_size - 1)
96 len = buf_size - 1;
97 memcpy(buf, p, len);
98 buf[len] = '\0';
99 }
100 *pp = p1;
101 return 0;
102 }
103
104 int parse_host_port(struct sockaddr_in *saddr, const char *str)
105 {
106 char buf[512];
107 struct hostent *he;
108 const char *p, *r;
109 int port;
110
111 p = str;
112 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0)
113 return -1;
114 saddr->sin_family = AF_INET;
115 if (buf[0] == '\0') {
116 saddr->sin_addr.s_addr = 0;
117 } else {
118 if (qemu_isdigit(buf[0])) {
119 if (!inet_aton(buf, &saddr->sin_addr))
120 return -1;
121 } else {
122 if ((he = gethostbyname(buf)) == NULL)
123 return - 1;
124 saddr->sin_addr = *(struct in_addr *)he->h_addr;
125 }
126 }
127 port = strtol(p, (char **)&r, 0);
128 if (r == p)
129 return -1;
130 saddr->sin_port = htons(port);
131 return 0;
132 }
133
134 char *qemu_mac_strdup_printf(const uint8_t *macaddr)
135 {
136 return g_strdup_printf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x",
137 macaddr[0], macaddr[1], macaddr[2],
138 macaddr[3], macaddr[4], macaddr[5]);
139 }
140
141 void qemu_format_nic_info_str(NetClientState *nc, uint8_t macaddr[6])
142 {
143 snprintf(nc->info_str, sizeof(nc->info_str),
144 "model=%s,macaddr=%02x:%02x:%02x:%02x:%02x:%02x",
145 nc->model,
146 macaddr[0], macaddr[1], macaddr[2],
147 macaddr[3], macaddr[4], macaddr[5]);
148 }
149
150 static int mac_table[256] = {0};
151
152 static void qemu_macaddr_set_used(MACAddr *macaddr)
153 {
154 int index;
155
156 for (index = 0x56; index < 0xFF; index++) {
157 if (macaddr->a[5] == index) {
158 mac_table[index]++;
159 }
160 }
161 }
162
163 static void qemu_macaddr_set_free(MACAddr *macaddr)
164 {
165 int index;
166 static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } };
167
168 if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) {
169 return;
170 }
171 for (index = 0x56; index < 0xFF; index++) {
172 if (macaddr->a[5] == index) {
173 mac_table[index]--;
174 }
175 }
176 }
177
178 static int qemu_macaddr_get_free(void)
179 {
180 int index;
181
182 for (index = 0x56; index < 0xFF; index++) {
183 if (mac_table[index] == 0) {
184 return index;
185 }
186 }
187
188 return -1;
189 }
190
191 void qemu_macaddr_default_if_unset(MACAddr *macaddr)
192 {
193 static const MACAddr zero = { .a = { 0,0,0,0,0,0 } };
194 static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } };
195
196 if (memcmp(macaddr, &zero, sizeof(zero)) != 0) {
197 if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) {
198 return;
199 } else {
200 qemu_macaddr_set_used(macaddr);
201 return;
202 }
203 }
204
205 macaddr->a[0] = 0x52;
206 macaddr->a[1] = 0x54;
207 macaddr->a[2] = 0x00;
208 macaddr->a[3] = 0x12;
209 macaddr->a[4] = 0x34;
210 macaddr->a[5] = qemu_macaddr_get_free();
211 qemu_macaddr_set_used(macaddr);
212 }
213
214 /**
215 * Generate a name for net client
216 *
217 * Only net clients created with the legacy -net option and NICs need this.
218 */
219 static char *assign_name(NetClientState *nc1, const char *model)
220 {
221 NetClientState *nc;
222 int id = 0;
223
224 QTAILQ_FOREACH(nc, &net_clients, next) {
225 if (nc == nc1) {
226 continue;
227 }
228 if (strcmp(nc->model, model) == 0) {
229 id++;
230 }
231 }
232
233 return g_strdup_printf("%s.%d", model, id);
234 }
235
236 static void qemu_net_client_destructor(NetClientState *nc)
237 {
238 g_free(nc);
239 }
240
241 static void qemu_net_client_setup(NetClientState *nc,
242 NetClientInfo *info,
243 NetClientState *peer,
244 const char *model,
245 const char *name,
246 NetClientDestructor *destructor)
247 {
248 nc->info = info;
249 nc->model = g_strdup(model);
250 if (name) {
251 nc->name = g_strdup(name);
252 } else {
253 nc->name = assign_name(nc, model);
254 }
255
256 if (peer) {
257 assert(!peer->peer);
258 nc->peer = peer;
259 peer->peer = nc;
260 }
261 QTAILQ_INSERT_TAIL(&net_clients, nc, next);
262
263 nc->incoming_queue = qemu_new_net_queue(qemu_deliver_packet_iov, nc);
264 nc->destructor = destructor;
265 QTAILQ_INIT(&nc->filters);
266 }
267
268 NetClientState *qemu_new_net_client(NetClientInfo *info,
269 NetClientState *peer,
270 const char *model,
271 const char *name)
272 {
273 NetClientState *nc;
274
275 assert(info->size >= sizeof(NetClientState));
276
277 nc = g_malloc0(info->size);
278 qemu_net_client_setup(nc, info, peer, model, name,
279 qemu_net_client_destructor);
280
281 return nc;
282 }
283
284 NICState *qemu_new_nic(NetClientInfo *info,
285 NICConf *conf,
286 const char *model,
287 const char *name,
288 void *opaque)
289 {
290 NetClientState **peers = conf->peers.ncs;
291 NICState *nic;
292 int i, queues = MAX(1, conf->peers.queues);
293
294 assert(info->type == NET_CLIENT_OPTIONS_KIND_NIC);
295 assert(info->size >= sizeof(NICState));
296
297 nic = g_malloc0(info->size + sizeof(NetClientState) * queues);
298 nic->ncs = (void *)nic + info->size;
299 nic->conf = conf;
300 nic->opaque = opaque;
301
302 for (i = 0; i < queues; i++) {
303 qemu_net_client_setup(&nic->ncs[i], info, peers[i], model, name,
304 NULL);
305 nic->ncs[i].queue_index = i;
306 }
307
308 return nic;
309 }
310
311 NetClientState *qemu_get_subqueue(NICState *nic, int queue_index)
312 {
313 return nic->ncs + queue_index;
314 }
315
316 NetClientState *qemu_get_queue(NICState *nic)
317 {
318 return qemu_get_subqueue(nic, 0);
319 }
320
321 NICState *qemu_get_nic(NetClientState *nc)
322 {
323 NetClientState *nc0 = nc - nc->queue_index;
324
325 return (NICState *)((void *)nc0 - nc->info->size);
326 }
327
328 void *qemu_get_nic_opaque(NetClientState *nc)
329 {
330 NICState *nic = qemu_get_nic(nc);
331
332 return nic->opaque;
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_OPTIONS_KIND_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_OPTIONS_KIND_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_OPTIONS_KIND_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_OPTIONS_KIND_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->info->set_vnet_hdr_len(nc, len);
497 }
498
499 int qemu_set_vnet_le(NetClientState *nc, bool is_le)
500 {
501 #ifdef HOST_WORDS_BIGENDIAN
502 if (!nc || !nc->info->set_vnet_le) {
503 return -ENOSYS;
504 }
505
506 return nc->info->set_vnet_le(nc, is_le);
507 #else
508 return 0;
509 #endif
510 }
511
512 int qemu_set_vnet_be(NetClientState *nc, bool is_be)
513 {
514 #ifdef HOST_WORDS_BIGENDIAN
515 return 0;
516 #else
517 if (!nc || !nc->info->set_vnet_be) {
518 return -ENOSYS;
519 }
520
521 return nc->info->set_vnet_be(nc, is_be);
522 #endif
523 }
524
525 int qemu_can_send_packet(NetClientState *sender)
526 {
527 int vm_running = runstate_is_running();
528
529 if (!vm_running) {
530 return 0;
531 }
532
533 if (!sender->peer) {
534 return 1;
535 }
536
537 if (sender->peer->receive_disabled) {
538 return 0;
539 } else if (sender->peer->info->can_receive &&
540 !sender->peer->info->can_receive(sender->peer)) {
541 return 0;
542 }
543 return 1;
544 }
545
546 static ssize_t filter_receive_iov(NetClientState *nc,
547 NetFilterDirection direction,
548 NetClientState *sender,
549 unsigned flags,
550 const struct iovec *iov,
551 int iovcnt,
552 NetPacketSent *sent_cb)
553 {
554 ssize_t ret = 0;
555 NetFilterState *nf = NULL;
556
557 if (direction == NET_FILTER_DIRECTION_TX) {
558 QTAILQ_FOREACH(nf, &nc->filters, next) {
559 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov,
560 iovcnt, sent_cb);
561 if (ret) {
562 return ret;
563 }
564 }
565 } else {
566 QTAILQ_FOREACH_REVERSE(nf, &nc->filters, NetFilterHead, next) {
567 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov,
568 iovcnt, sent_cb);
569 if (ret) {
570 return ret;
571 }
572 }
573 }
574
575 return ret;
576 }
577
578 static ssize_t filter_receive(NetClientState *nc,
579 NetFilterDirection direction,
580 NetClientState *sender,
581 unsigned flags,
582 const uint8_t *data,
583 size_t size,
584 NetPacketSent *sent_cb)
585 {
586 struct iovec iov = {
587 .iov_base = (void *)data,
588 .iov_len = size
589 };
590
591 return filter_receive_iov(nc, direction, sender, flags, &iov, 1, sent_cb);
592 }
593
594 void qemu_purge_queued_packets(NetClientState *nc)
595 {
596 if (!nc->peer) {
597 return;
598 }
599
600 qemu_net_queue_purge(nc->peer->incoming_queue, nc);
601 }
602
603 static
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_OPTIONS_KIND_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);
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((const char *)buf, stdout, "net", 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 void qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size)
673 {
674 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 buf = g_new(uint8_t, NET_BUFSIZE);
696 buffer = buf;
697 offset = iov_to_buf(iov, iovcnt, 0, buf, NET_BUFSIZE);
698 }
699
700 if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) {
701 ret = nc->info->receive_raw(nc, buffer, offset);
702 } else {
703 ret = nc->info->receive(nc, buffer, offset);
704 }
705
706 g_free(buf);
707 return ret;
708 }
709
710 ssize_t qemu_deliver_packet_iov(NetClientState *sender,
711 unsigned flags,
712 const struct iovec *iov,
713 int iovcnt,
714 void *opaque)
715 {
716 NetClientState *nc = opaque;
717 int ret;
718
719 if (nc->link_down) {
720 return iov_size(iov, iovcnt);
721 }
722
723 if (nc->receive_disabled) {
724 return 0;
725 }
726
727 if (nc->info->receive_iov) {
728 ret = nc->info->receive_iov(nc, iov, iovcnt);
729 } else {
730 ret = nc_sendv_compat(nc, iov, iovcnt, flags);
731 }
732
733 if (ret == 0) {
734 nc->receive_disabled = 1;
735 }
736
737 return ret;
738 }
739
740 ssize_t qemu_sendv_packet_async(NetClientState *sender,
741 const struct iovec *iov, int iovcnt,
742 NetPacketSent *sent_cb)
743 {
744 NetQueue *queue;
745 int ret;
746
747 if (sender->link_down || !sender->peer) {
748 return iov_size(iov, iovcnt);
749 }
750
751 /* Let filters handle the packet first */
752 ret = filter_receive_iov(sender, NET_FILTER_DIRECTION_TX, sender,
753 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb);
754 if (ret) {
755 return ret;
756 }
757
758 ret = filter_receive_iov(sender->peer, NET_FILTER_DIRECTION_RX, sender,
759 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb);
760 if (ret) {
761 return ret;
762 }
763
764 queue = sender->peer->incoming_queue;
765
766 return qemu_net_queue_send_iov(queue, sender,
767 QEMU_NET_PACKET_FLAG_NONE,
768 iov, iovcnt, sent_cb);
769 }
770
771 ssize_t
772 qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt)
773 {
774 return qemu_sendv_packet_async(nc, iov, iovcnt, NULL);
775 }
776
777 NetClientState *qemu_find_netdev(const char *id)
778 {
779 NetClientState *nc;
780
781 QTAILQ_FOREACH(nc, &net_clients, next) {
782 if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC)
783 continue;
784 if (!strcmp(nc->name, id)) {
785 return nc;
786 }
787 }
788
789 return NULL;
790 }
791
792 int qemu_find_net_clients_except(const char *id, NetClientState **ncs,
793 NetClientOptionsKind type, int max)
794 {
795 NetClientState *nc;
796 int ret = 0;
797
798 QTAILQ_FOREACH(nc, &net_clients, next) {
799 if (nc->info->type == type) {
800 continue;
801 }
802 if (!id || !strcmp(nc->name, id)) {
803 if (ret < max) {
804 ncs[ret] = nc;
805 }
806 ret++;
807 }
808 }
809
810 return ret;
811 }
812
813 static int nic_get_free_idx(void)
814 {
815 int index;
816
817 for (index = 0; index < MAX_NICS; index++)
818 if (!nd_table[index].used)
819 return index;
820 return -1;
821 }
822
823 int qemu_show_nic_models(const char *arg, const char *const *models)
824 {
825 int i;
826
827 if (!arg || !is_help_option(arg)) {
828 return 0;
829 }
830
831 fprintf(stderr, "qemu: Supported NIC models: ");
832 for (i = 0 ; models[i]; i++)
833 fprintf(stderr, "%s%c", models[i], models[i+1] ? ',' : '\n');
834 return 1;
835 }
836
837 void qemu_check_nic_model(NICInfo *nd, const char *model)
838 {
839 const char *models[2];
840
841 models[0] = model;
842 models[1] = NULL;
843
844 if (qemu_show_nic_models(nd->model, models))
845 exit(0);
846 if (qemu_find_nic_model(nd, models, model) < 0)
847 exit(1);
848 }
849
850 int qemu_find_nic_model(NICInfo *nd, const char * const *models,
851 const char *default_model)
852 {
853 int i;
854
855 if (!nd->model)
856 nd->model = g_strdup(default_model);
857
858 for (i = 0 ; models[i]; i++) {
859 if (strcmp(nd->model, models[i]) == 0)
860 return i;
861 }
862
863 error_report("Unsupported NIC model: %s", nd->model);
864 return -1;
865 }
866
867 static int net_init_nic(const NetClientOptions *opts, const char *name,
868 NetClientState *peer, Error **errp)
869 {
870 int idx;
871 NICInfo *nd;
872 const NetLegacyNicOptions *nic;
873
874 assert(opts->type == NET_CLIENT_OPTIONS_KIND_NIC);
875 nic = opts->u.nic.data;
876
877 idx = nic_get_free_idx();
878 if (idx == -1 || nb_nics >= MAX_NICS) {
879 error_setg(errp, "too many NICs");
880 return -1;
881 }
882
883 nd = &nd_table[idx];
884
885 memset(nd, 0, sizeof(*nd));
886
887 if (nic->has_netdev) {
888 nd->netdev = qemu_find_netdev(nic->netdev);
889 if (!nd->netdev) {
890 error_setg(errp, "netdev '%s' not found", nic->netdev);
891 return -1;
892 }
893 } else {
894 assert(peer);
895 nd->netdev = peer;
896 }
897 nd->name = g_strdup(name);
898 if (nic->has_model) {
899 nd->model = g_strdup(nic->model);
900 }
901 if (nic->has_addr) {
902 nd->devaddr = g_strdup(nic->addr);
903 }
904
905 if (nic->has_macaddr &&
906 net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) {
907 error_setg(errp, "invalid syntax for ethernet address");
908 return -1;
909 }
910 if (nic->has_macaddr &&
911 is_multicast_ether_addr(nd->macaddr.a)) {
912 error_setg(errp,
913 "NIC cannot have multicast MAC address (odd 1st byte)");
914 return -1;
915 }
916 qemu_macaddr_default_if_unset(&nd->macaddr);
917
918 if (nic->has_vectors) {
919 if (nic->vectors > 0x7ffffff) {
920 error_setg(errp, "invalid # of vectors: %"PRIu32, nic->vectors);
921 return -1;
922 }
923 nd->nvectors = nic->vectors;
924 } else {
925 nd->nvectors = DEV_NVECTORS_UNSPECIFIED;
926 }
927
928 nd->used = 1;
929 nb_nics++;
930
931 return idx;
932 }
933
934
935 static int (* const net_client_init_fun[NET_CLIENT_OPTIONS_KIND__MAX])(
936 const NetClientOptions *opts,
937 const char *name,
938 NetClientState *peer, Error **errp) = {
939 [NET_CLIENT_OPTIONS_KIND_NIC] = net_init_nic,
940 #ifdef CONFIG_SLIRP
941 [NET_CLIENT_OPTIONS_KIND_USER] = net_init_slirp,
942 #endif
943 [NET_CLIENT_OPTIONS_KIND_TAP] = net_init_tap,
944 [NET_CLIENT_OPTIONS_KIND_SOCKET] = net_init_socket,
945 #ifdef CONFIG_VDE
946 [NET_CLIENT_OPTIONS_KIND_VDE] = net_init_vde,
947 #endif
948 #ifdef CONFIG_NETMAP
949 [NET_CLIENT_OPTIONS_KIND_NETMAP] = net_init_netmap,
950 #endif
951 [NET_CLIENT_OPTIONS_KIND_DUMP] = net_init_dump,
952 #ifdef CONFIG_NET_BRIDGE
953 [NET_CLIENT_OPTIONS_KIND_BRIDGE] = net_init_bridge,
954 #endif
955 [NET_CLIENT_OPTIONS_KIND_HUBPORT] = net_init_hubport,
956 #ifdef CONFIG_VHOST_NET_USED
957 [NET_CLIENT_OPTIONS_KIND_VHOST_USER] = net_init_vhost_user,
958 #endif
959 #ifdef CONFIG_L2TPV3
960 [NET_CLIENT_OPTIONS_KIND_L2TPV3] = net_init_l2tpv3,
961 #endif
962 };
963
964
965 static int net_client_init1(const void *object, int is_netdev, Error **errp)
966 {
967 const NetClientOptions *opts;
968 const char *name;
969 NetClientState *peer = NULL;
970
971 if (is_netdev) {
972 const Netdev *netdev = object;
973 opts = netdev->opts;
974 name = netdev->id;
975
976 if (opts->type == NET_CLIENT_OPTIONS_KIND_DUMP ||
977 opts->type == NET_CLIENT_OPTIONS_KIND_NIC ||
978 !net_client_init_fun[opts->type]) {
979 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
980 "a netdev backend type");
981 return -1;
982 }
983 } else {
984 const NetLegacy *net = object;
985 opts = net->opts;
986 /* missing optional values have been initialized to "all bits zero" */
987 name = net->has_id ? net->id : net->name;
988
989 if (opts->type == NET_CLIENT_OPTIONS_KIND_NONE) {
990 return 0; /* nothing to do */
991 }
992 if (opts->type == NET_CLIENT_OPTIONS_KIND_HUBPORT) {
993 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
994 "a net type");
995 return -1;
996 }
997
998 if (!net_client_init_fun[opts->type]) {
999 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
1000 "a net backend type (maybe it is not compiled "
1001 "into this binary)");
1002 return -1;
1003 }
1004
1005 /* Do not add to a vlan if it's a nic with a netdev= parameter. */
1006 if (opts->type != NET_CLIENT_OPTIONS_KIND_NIC ||
1007 !opts->u.nic.data->has_netdev) {
1008 peer = net_hub_add_port(net->has_vlan ? net->vlan : 0, NULL);
1009 }
1010 }
1011
1012 if (net_client_init_fun[opts->type](opts, name, peer, errp) < 0) {
1013 /* FIXME drop when all init functions store an Error */
1014 if (errp && !*errp) {
1015 error_setg(errp, QERR_DEVICE_INIT_FAILED,
1016 NetClientOptionsKind_lookup[opts->type]);
1017 }
1018 return -1;
1019 }
1020 return 0;
1021 }
1022
1023
1024 int net_client_init(QemuOpts *opts, int is_netdev, Error **errp)
1025 {
1026 void *object = NULL;
1027 Error *err = NULL;
1028 int ret = -1;
1029 OptsVisitor *ov = opts_visitor_new(opts);
1030 Visitor *v = opts_get_visitor(ov);
1031
1032 {
1033 /* Parse convenience option format ip6-net=fec0::0[/64] */
1034 const char *ip6_net = qemu_opt_get(opts, "ipv6-net");
1035
1036 if (ip6_net) {
1037 char buf[strlen(ip6_net) + 1];
1038
1039 if (get_str_sep(buf, sizeof(buf), &ip6_net, '/') < 0) {
1040 /* Default 64bit prefix length. */
1041 qemu_opt_set(opts, "ipv6-prefix", ip6_net, &error_abort);
1042 qemu_opt_set_number(opts, "ipv6-prefixlen", 64, &error_abort);
1043 } else {
1044 /* User-specified prefix length. */
1045 unsigned long len;
1046 int err;
1047
1048 qemu_opt_set(opts, "ipv6-prefix", buf, &error_abort);
1049 err = qemu_strtoul(ip6_net, NULL, 10, &len);
1050
1051 if (err) {
1052 error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1053 "ipv6-prefix", "a number");
1054 } else {
1055 qemu_opt_set_number(opts, "ipv6-prefixlen", len,
1056 &error_abort);
1057 }
1058 }
1059 qemu_opt_unset(opts, "ipv6-net");
1060 }
1061 }
1062
1063 if (is_netdev) {
1064 visit_type_Netdev(v, NULL, (Netdev **)&object, &err);
1065 } else {
1066 visit_type_NetLegacy(v, NULL, (NetLegacy **)&object, &err);
1067 }
1068
1069 if (!err) {
1070 ret = net_client_init1(object, is_netdev, &err);
1071 }
1072
1073 if (is_netdev) {
1074 qapi_free_Netdev(object);
1075 } else {
1076 qapi_free_NetLegacy(object);
1077 }
1078
1079 error_propagate(errp, err);
1080 opts_visitor_cleanup(ov);
1081 return ret;
1082 }
1083
1084
1085 static int net_host_check_device(const char *device)
1086 {
1087 int i;
1088 for (i = 0; host_net_devices[i]; i++) {
1089 if (!strncmp(host_net_devices[i], device,
1090 strlen(host_net_devices[i]))) {
1091 return 1;
1092 }
1093 }
1094
1095 return 0;
1096 }
1097
1098 void hmp_host_net_add(Monitor *mon, const QDict *qdict)
1099 {
1100 const char *device = qdict_get_str(qdict, "device");
1101 const char *opts_str = qdict_get_try_str(qdict, "opts");
1102 Error *local_err = NULL;
1103 QemuOpts *opts;
1104
1105 if (!net_host_check_device(device)) {
1106 monitor_printf(mon, "invalid host network device %s\n", device);
1107 return;
1108 }
1109
1110 opts = qemu_opts_parse_noisily(qemu_find_opts("net"),
1111 opts_str ? opts_str : "", false);
1112 if (!opts) {
1113 return;
1114 }
1115
1116 qemu_opt_set(opts, "type", device, &error_abort);
1117
1118 net_client_init(opts, 0, &local_err);
1119 if (local_err) {
1120 error_report_err(local_err);
1121 monitor_printf(mon, "adding host network device %s failed\n", device);
1122 }
1123 }
1124
1125 void hmp_host_net_remove(Monitor *mon, const QDict *qdict)
1126 {
1127 NetClientState *nc;
1128 int vlan_id = qdict_get_int(qdict, "vlan_id");
1129 const char *device = qdict_get_str(qdict, "device");
1130
1131 nc = net_hub_find_client_by_name(vlan_id, device);
1132 if (!nc) {
1133 error_report("Host network device '%s' on hub '%d' not found",
1134 device, vlan_id);
1135 return;
1136 }
1137 if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
1138 error_report("invalid host network device '%s'", device);
1139 return;
1140 }
1141
1142 qemu_del_net_client(nc->peer);
1143 qemu_del_net_client(nc);
1144 }
1145
1146 void netdev_add(QemuOpts *opts, Error **errp)
1147 {
1148 net_client_init(opts, 1, errp);
1149 }
1150
1151 void qmp_netdev_add(QDict *qdict, QObject **ret, Error **errp)
1152 {
1153 Error *local_err = NULL;
1154 QemuOptsList *opts_list;
1155 QemuOpts *opts;
1156
1157 opts_list = qemu_find_opts_err("netdev", &local_err);
1158 if (local_err) {
1159 goto out;
1160 }
1161
1162 opts = qemu_opts_from_qdict(opts_list, qdict, &local_err);
1163 if (local_err) {
1164 goto out;
1165 }
1166
1167 netdev_add(opts, &local_err);
1168 if (local_err) {
1169 qemu_opts_del(opts);
1170 goto out;
1171 }
1172
1173 out:
1174 error_propagate(errp, local_err);
1175 }
1176
1177 void qmp_netdev_del(const char *id, Error **errp)
1178 {
1179 NetClientState *nc;
1180 QemuOpts *opts;
1181
1182 nc = qemu_find_netdev(id);
1183 if (!nc) {
1184 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1185 "Device '%s' not found", id);
1186 return;
1187 }
1188
1189 opts = qemu_opts_find(qemu_find_opts_err("netdev", NULL), id);
1190 if (!opts) {
1191 error_setg(errp, "Device '%s' is not a netdev", id);
1192 return;
1193 }
1194
1195 qemu_del_net_client(nc);
1196 qemu_opts_del(opts);
1197 }
1198
1199 static void netfilter_print_info(Monitor *mon, NetFilterState *nf)
1200 {
1201 char *str;
1202 ObjectProperty *prop;
1203 ObjectPropertyIterator iter;
1204 StringOutputVisitor *ov;
1205
1206 /* generate info str */
1207 object_property_iter_init(&iter, OBJECT(nf));
1208 while ((prop = object_property_iter_next(&iter))) {
1209 if (!strcmp(prop->name, "type")) {
1210 continue;
1211 }
1212 ov = string_output_visitor_new(false);
1213 object_property_get(OBJECT(nf), string_output_get_visitor(ov),
1214 prop->name, NULL);
1215 str = string_output_get_string(ov);
1216 string_output_visitor_cleanup(ov);
1217 monitor_printf(mon, ",%s=%s", prop->name, str);
1218 g_free(str);
1219 }
1220 monitor_printf(mon, "\n");
1221 }
1222
1223 void print_net_client(Monitor *mon, NetClientState *nc)
1224 {
1225 NetFilterState *nf;
1226
1227 monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name,
1228 nc->queue_index,
1229 NetClientOptionsKind_lookup[nc->info->type],
1230 nc->info_str);
1231 if (!QTAILQ_EMPTY(&nc->filters)) {
1232 monitor_printf(mon, "filters:\n");
1233 }
1234 QTAILQ_FOREACH(nf, &nc->filters, next) {
1235 char *path = object_get_canonical_path_component(OBJECT(nf));
1236
1237 monitor_printf(mon, " - %s: type=%s", path,
1238 object_get_typename(OBJECT(nf)));
1239 netfilter_print_info(mon, nf);
1240 g_free(path);
1241 }
1242 }
1243
1244 RxFilterInfoList *qmp_query_rx_filter(bool has_name, const char *name,
1245 Error **errp)
1246 {
1247 NetClientState *nc;
1248 RxFilterInfoList *filter_list = NULL, *last_entry = NULL;
1249
1250 QTAILQ_FOREACH(nc, &net_clients, next) {
1251 RxFilterInfoList *entry;
1252 RxFilterInfo *info;
1253
1254 if (has_name && strcmp(nc->name, name) != 0) {
1255 continue;
1256 }
1257
1258 /* only query rx-filter information of NIC */
1259 if (nc->info->type != NET_CLIENT_OPTIONS_KIND_NIC) {
1260 if (has_name) {
1261 error_setg(errp, "net client(%s) isn't a NIC", name);
1262 return NULL;
1263 }
1264 continue;
1265 }
1266
1267 /* only query information on queue 0 since the info is per nic,
1268 * not per queue
1269 */
1270 if (nc->queue_index != 0)
1271 continue;
1272
1273 if (nc->info->query_rx_filter) {
1274 info = nc->info->query_rx_filter(nc);
1275 entry = g_malloc0(sizeof(*entry));
1276 entry->value = info;
1277
1278 if (!filter_list) {
1279 filter_list = entry;
1280 } else {
1281 last_entry->next = entry;
1282 }
1283 last_entry = entry;
1284 } else if (has_name) {
1285 error_setg(errp, "net client(%s) doesn't support"
1286 " rx-filter querying", name);
1287 return NULL;
1288 }
1289
1290 if (has_name) {
1291 break;
1292 }
1293 }
1294
1295 if (filter_list == NULL && has_name) {
1296 error_setg(errp, "invalid net client name: %s", name);
1297 }
1298
1299 return filter_list;
1300 }
1301
1302 void hmp_info_network(Monitor *mon, const QDict *qdict)
1303 {
1304 NetClientState *nc, *peer;
1305 NetClientOptionsKind type;
1306
1307 net_hub_info(mon);
1308
1309 QTAILQ_FOREACH(nc, &net_clients, next) {
1310 peer = nc->peer;
1311 type = nc->info->type;
1312
1313 /* Skip if already printed in hub info */
1314 if (net_hub_id_for_client(nc, NULL) == 0) {
1315 continue;
1316 }
1317
1318 if (!peer || type == NET_CLIENT_OPTIONS_KIND_NIC) {
1319 print_net_client(mon, nc);
1320 } /* else it's a netdev connected to a NIC, printed with the NIC */
1321 if (peer && type == NET_CLIENT_OPTIONS_KIND_NIC) {
1322 monitor_printf(mon, " \\ ");
1323 print_net_client(mon, peer);
1324 }
1325 }
1326 }
1327
1328 void qmp_set_link(const char *name, bool up, Error **errp)
1329 {
1330 NetClientState *ncs[MAX_QUEUE_NUM];
1331 NetClientState *nc;
1332 int queues, i;
1333
1334 queues = qemu_find_net_clients_except(name, ncs,
1335 NET_CLIENT_OPTIONS_KIND__MAX,
1336 MAX_QUEUE_NUM);
1337
1338 if (queues == 0) {
1339 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1340 "Device '%s' not found", name);
1341 return;
1342 }
1343 nc = ncs[0];
1344
1345 for (i = 0; i < queues; i++) {
1346 ncs[i]->link_down = !up;
1347 }
1348
1349 if (nc->info->link_status_changed) {
1350 nc->info->link_status_changed(nc);
1351 }
1352
1353 if (nc->peer) {
1354 /* Change peer link only if the peer is NIC and then notify peer.
1355 * If the peer is a HUBPORT or a backend, we do not change the
1356 * link status.
1357 *
1358 * This behavior is compatible with qemu vlans where there could be
1359 * multiple clients that can still communicate with each other in
1360 * disconnected mode. For now maintain this compatibility.
1361 */
1362 if (nc->peer->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
1363 for (i = 0; i < queues; i++) {
1364 ncs[i]->peer->link_down = !up;
1365 }
1366 }
1367 if (nc->peer->info->link_status_changed) {
1368 nc->peer->info->link_status_changed(nc->peer);
1369 }
1370 }
1371 }
1372
1373 static void net_vm_change_state_handler(void *opaque, int running,
1374 RunState state)
1375 {
1376 NetClientState *nc;
1377 NetClientState *tmp;
1378
1379 QTAILQ_FOREACH_SAFE(nc, &net_clients, next, tmp) {
1380 if (running) {
1381 /* Flush queued packets and wake up backends. */
1382 if (nc->peer && qemu_can_send_packet(nc)) {
1383 qemu_flush_queued_packets(nc->peer);
1384 }
1385 } else {
1386 /* Complete all queued packets, to guarantee we don't modify
1387 * state later when VM is not running.
1388 */
1389 qemu_flush_or_purge_queued_packets(nc, true);
1390 }
1391 }
1392 }
1393
1394 void net_cleanup(void)
1395 {
1396 NetClientState *nc;
1397
1398 /* We may del multiple entries during qemu_del_net_client(),
1399 * so QTAILQ_FOREACH_SAFE() is also not safe here.
1400 */
1401 while (!QTAILQ_EMPTY(&net_clients)) {
1402 nc = QTAILQ_FIRST(&net_clients);
1403 if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
1404 qemu_del_nic(qemu_get_nic(nc));
1405 } else {
1406 qemu_del_net_client(nc);
1407 }
1408 }
1409
1410 qemu_del_vm_change_state_handler(net_change_state_entry);
1411 }
1412
1413 void net_check_clients(void)
1414 {
1415 NetClientState *nc;
1416 int i;
1417
1418 /* Don't warn about the default network setup that you get if
1419 * no command line -net or -netdev options are specified. There
1420 * are two cases that we would otherwise complain about:
1421 * (1) board doesn't support a NIC but the implicit "-net nic"
1422 * requested one
1423 * (2) CONFIG_SLIRP not set, in which case the implicit "-net nic"
1424 * sets up a nic that isn't connected to anything.
1425 */
1426 if (default_net) {
1427 return;
1428 }
1429
1430 net_hub_check_clients();
1431
1432 QTAILQ_FOREACH(nc, &net_clients, next) {
1433 if (!nc->peer) {
1434 fprintf(stderr, "Warning: %s %s has no peer\n",
1435 nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC ?
1436 "nic" : "netdev", nc->name);
1437 }
1438 }
1439
1440 /* Check that all NICs requested via -net nic actually got created.
1441 * NICs created via -device don't need to be checked here because
1442 * they are always instantiated.
1443 */
1444 for (i = 0; i < MAX_NICS; i++) {
1445 NICInfo *nd = &nd_table[i];
1446 if (nd->used && !nd->instantiated) {
1447 fprintf(stderr, "Warning: requested NIC (%s, model %s) "
1448 "was not created (not supported by this machine?)\n",
1449 nd->name ? nd->name : "anonymous",
1450 nd->model ? nd->model : "unspecified");
1451 }
1452 }
1453 }
1454
1455 static int net_init_client(void *dummy, QemuOpts *opts, Error **errp)
1456 {
1457 Error *local_err = NULL;
1458
1459 net_client_init(opts, 0, &local_err);
1460 if (local_err) {
1461 error_report_err(local_err);
1462 return -1;
1463 }
1464
1465 return 0;
1466 }
1467
1468 static int net_init_netdev(void *dummy, QemuOpts *opts, Error **errp)
1469 {
1470 Error *local_err = NULL;
1471 int ret;
1472
1473 ret = net_client_init(opts, 1, &local_err);
1474 if (local_err) {
1475 error_report_err(local_err);
1476 return -1;
1477 }
1478
1479 return ret;
1480 }
1481
1482 int net_init_clients(void)
1483 {
1484 QemuOptsList *net = qemu_find_opts("net");
1485
1486 if (default_net) {
1487 /* if no clients, we use a default config */
1488 qemu_opts_set(net, NULL, "type", "nic", &error_abort);
1489 #ifdef CONFIG_SLIRP
1490 qemu_opts_set(net, NULL, "type", "user", &error_abort);
1491 #endif
1492 }
1493
1494 net_change_state_entry =
1495 qemu_add_vm_change_state_handler(net_vm_change_state_handler, NULL);
1496
1497 QTAILQ_INIT(&net_clients);
1498
1499 if (qemu_opts_foreach(qemu_find_opts("netdev"),
1500 net_init_netdev, NULL, NULL)) {
1501 return -1;
1502 }
1503
1504 if (qemu_opts_foreach(net, net_init_client, NULL, NULL)) {
1505 return -1;
1506 }
1507
1508 return 0;
1509 }
1510
1511 int net_client_parse(QemuOptsList *opts_list, const char *optarg)
1512 {
1513 #if defined(CONFIG_SLIRP)
1514 int ret;
1515 if (net_slirp_parse_legacy(opts_list, optarg, &ret)) {
1516 return ret;
1517 }
1518 #endif
1519
1520 if (!qemu_opts_parse_noisily(opts_list, optarg, true)) {
1521 return -1;
1522 }
1523
1524 default_net = 0;
1525 return 0;
1526 }
1527
1528 /* From FreeBSD */
1529 /* XXX: optimize */
1530 unsigned compute_mcast_idx(const uint8_t *ep)
1531 {
1532 uint32_t crc;
1533 int carry, i, j;
1534 uint8_t b;
1535
1536 crc = 0xffffffff;
1537 for (i = 0; i < 6; i++) {
1538 b = *ep++;
1539 for (j = 0; j < 8; j++) {
1540 carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01);
1541 crc <<= 1;
1542 b >>= 1;
1543 if (carry) {
1544 crc = ((crc ^ POLYNOMIAL) | carry);
1545 }
1546 }
1547 }
1548 return crc >> 26;
1549 }
1550
1551 QemuOptsList qemu_netdev_opts = {
1552 .name = "netdev",
1553 .implied_opt_name = "type",
1554 .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head),
1555 .desc = {
1556 /*
1557 * no elements => accept any params
1558 * validation will happen later
1559 */
1560 { /* end of list */ }
1561 },
1562 };
1563
1564 QemuOptsList qemu_net_opts = {
1565 .name = "net",
1566 .implied_opt_name = "type",
1567 .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head),
1568 .desc = {
1569 /*
1570 * no elements => accept any params
1571 * validation will happen later
1572 */
1573 { /* end of list */ }
1574 },
1575 };