net: ignore packet size greater than INT_MAX
[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 "net/slirp.h"
31 #include "net/eth.h"
32 #include "util.h"
33
34 #include "monitor/monitor.h"
35 #include "qemu/help_option.h"
36 #include "qapi/qapi-commands-net.h"
37 #include "qapi/qapi-visit-net.h"
38 #include "qapi/qmp/qdict.h"
39 #include "qapi/qmp/qerror.h"
40 #include "qemu/error-report.h"
41 #include "qemu/sockets.h"
42 #include "qemu/cutils.h"
43 #include "qemu/config-file.h"
44 #include "hw/qdev.h"
45 #include "qemu/iov.h"
46 #include "qemu/main-loop.h"
47 #include "qemu/option.h"
48 #include "qapi/error.h"
49 #include "qapi/opts-visitor.h"
50 #include "sysemu/sysemu.h"
51 #include "sysemu/qtest.h"
52 #include "net/filter.h"
53 #include "qapi/string-output-visitor.h"
54
55 /* Net bridge is currently not supported for W32. */
56 #if !defined(_WIN32)
57 # define CONFIG_NET_BRIDGE
58 #endif
59
60 static VMChangeStateEntry *net_change_state_entry;
61 static QTAILQ_HEAD(, NetClientState) net_clients;
62
63 /***********************************************************/
64 /* network device redirectors */
65
66 static int get_str_sep(char *buf, int buf_size, const char **pp, int sep)
67 {
68 const char *p, *p1;
69 int len;
70 p = *pp;
71 p1 = strchr(p, sep);
72 if (!p1)
73 return -1;
74 len = p1 - p;
75 p1++;
76 if (buf_size > 0) {
77 if (len > buf_size - 1)
78 len = buf_size - 1;
79 memcpy(buf, p, len);
80 buf[len] = '\0';
81 }
82 *pp = p1;
83 return 0;
84 }
85
86 int parse_host_port(struct sockaddr_in *saddr, const char *str,
87 Error **errp)
88 {
89 char buf[512];
90 struct hostent *he;
91 const char *p, *r;
92 int port;
93
94 p = str;
95 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
96 error_setg(errp, "host address '%s' doesn't contain ':' "
97 "separating host from port", str);
98 return -1;
99 }
100 saddr->sin_family = AF_INET;
101 if (buf[0] == '\0') {
102 saddr->sin_addr.s_addr = 0;
103 } else {
104 if (qemu_isdigit(buf[0])) {
105 if (!inet_aton(buf, &saddr->sin_addr)) {
106 error_setg(errp, "host address '%s' is not a valid "
107 "IPv4 address", buf);
108 return -1;
109 }
110 } else {
111 he = gethostbyname(buf);
112 if (he == NULL) {
113 error_setg(errp, "can't resolve host address '%s'", buf);
114 return - 1;
115 }
116 saddr->sin_addr = *(struct in_addr *)he->h_addr;
117 }
118 }
119 port = strtol(p, (char **)&r, 0);
120 if (r == p) {
121 error_setg(errp, "port number '%s' is invalid", p);
122 return -1;
123 }
124 saddr->sin_port = htons(port);
125 return 0;
126 }
127
128 char *qemu_mac_strdup_printf(const uint8_t *macaddr)
129 {
130 return g_strdup_printf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x",
131 macaddr[0], macaddr[1], macaddr[2],
132 macaddr[3], macaddr[4], macaddr[5]);
133 }
134
135 void qemu_format_nic_info_str(NetClientState *nc, uint8_t macaddr[6])
136 {
137 snprintf(nc->info_str, sizeof(nc->info_str),
138 "model=%s,macaddr=%02x:%02x:%02x:%02x:%02x:%02x",
139 nc->model,
140 macaddr[0], macaddr[1], macaddr[2],
141 macaddr[3], macaddr[4], macaddr[5]);
142 }
143
144 static int mac_table[256] = {0};
145
146 static void qemu_macaddr_set_used(MACAddr *macaddr)
147 {
148 int index;
149
150 for (index = 0x56; index < 0xFF; index++) {
151 if (macaddr->a[5] == index) {
152 mac_table[index]++;
153 }
154 }
155 }
156
157 static void qemu_macaddr_set_free(MACAddr *macaddr)
158 {
159 int index;
160 static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } };
161
162 if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) {
163 return;
164 }
165 for (index = 0x56; index < 0xFF; index++) {
166 if (macaddr->a[5] == index) {
167 mac_table[index]--;
168 }
169 }
170 }
171
172 static int qemu_macaddr_get_free(void)
173 {
174 int index;
175
176 for (index = 0x56; index < 0xFF; index++) {
177 if (mac_table[index] == 0) {
178 return index;
179 }
180 }
181
182 return -1;
183 }
184
185 void qemu_macaddr_default_if_unset(MACAddr *macaddr)
186 {
187 static const MACAddr zero = { .a = { 0,0,0,0,0,0 } };
188 static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } };
189
190 if (memcmp(macaddr, &zero, sizeof(zero)) != 0) {
191 if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) {
192 return;
193 } else {
194 qemu_macaddr_set_used(macaddr);
195 return;
196 }
197 }
198
199 macaddr->a[0] = 0x52;
200 macaddr->a[1] = 0x54;
201 macaddr->a[2] = 0x00;
202 macaddr->a[3] = 0x12;
203 macaddr->a[4] = 0x34;
204 macaddr->a[5] = qemu_macaddr_get_free();
205 qemu_macaddr_set_used(macaddr);
206 }
207
208 /**
209 * Generate a name for net client
210 *
211 * Only net clients created with the legacy -net option and NICs need this.
212 */
213 static char *assign_name(NetClientState *nc1, const char *model)
214 {
215 NetClientState *nc;
216 int id = 0;
217
218 QTAILQ_FOREACH(nc, &net_clients, next) {
219 if (nc == nc1) {
220 continue;
221 }
222 if (strcmp(nc->model, model) == 0) {
223 id++;
224 }
225 }
226
227 return g_strdup_printf("%s.%d", model, id);
228 }
229
230 static void qemu_net_client_destructor(NetClientState *nc)
231 {
232 g_free(nc);
233 }
234
235 static void qemu_net_client_setup(NetClientState *nc,
236 NetClientInfo *info,
237 NetClientState *peer,
238 const char *model,
239 const char *name,
240 NetClientDestructor *destructor)
241 {
242 nc->info = info;
243 nc->model = g_strdup(model);
244 if (name) {
245 nc->name = g_strdup(name);
246 } else {
247 nc->name = assign_name(nc, model);
248 }
249
250 if (peer) {
251 assert(!peer->peer);
252 nc->peer = peer;
253 peer->peer = nc;
254 }
255 QTAILQ_INSERT_TAIL(&net_clients, nc, next);
256
257 nc->incoming_queue = qemu_new_net_queue(qemu_deliver_packet_iov, nc);
258 nc->destructor = destructor;
259 QTAILQ_INIT(&nc->filters);
260 }
261
262 NetClientState *qemu_new_net_client(NetClientInfo *info,
263 NetClientState *peer,
264 const char *model,
265 const char *name)
266 {
267 NetClientState *nc;
268
269 assert(info->size >= sizeof(NetClientState));
270
271 nc = g_malloc0(info->size);
272 qemu_net_client_setup(nc, info, peer, model, name,
273 qemu_net_client_destructor);
274
275 return nc;
276 }
277
278 NICState *qemu_new_nic(NetClientInfo *info,
279 NICConf *conf,
280 const char *model,
281 const char *name,
282 void *opaque)
283 {
284 NetClientState **peers = conf->peers.ncs;
285 NICState *nic;
286 int i, queues = MAX(1, conf->peers.queues);
287
288 assert(info->type == NET_CLIENT_DRIVER_NIC);
289 assert(info->size >= sizeof(NICState));
290
291 nic = g_malloc0(info->size + sizeof(NetClientState) * queues);
292 nic->ncs = (void *)nic + info->size;
293 nic->conf = conf;
294 nic->opaque = opaque;
295
296 for (i = 0; i < queues; i++) {
297 qemu_net_client_setup(&nic->ncs[i], info, peers[i], model, name,
298 NULL);
299 nic->ncs[i].queue_index = i;
300 }
301
302 return nic;
303 }
304
305 NetClientState *qemu_get_subqueue(NICState *nic, int queue_index)
306 {
307 return nic->ncs + queue_index;
308 }
309
310 NetClientState *qemu_get_queue(NICState *nic)
311 {
312 return qemu_get_subqueue(nic, 0);
313 }
314
315 NICState *qemu_get_nic(NetClientState *nc)
316 {
317 NetClientState *nc0 = nc - nc->queue_index;
318
319 return (NICState *)((void *)nc0 - nc->info->size);
320 }
321
322 void *qemu_get_nic_opaque(NetClientState *nc)
323 {
324 NICState *nic = qemu_get_nic(nc);
325
326 return nic->opaque;
327 }
328
329 static void qemu_cleanup_net_client(NetClientState *nc)
330 {
331 QTAILQ_REMOVE(&net_clients, nc, next);
332
333 if (nc->info->cleanup) {
334 nc->info->cleanup(nc);
335 }
336 }
337
338 static void qemu_free_net_client(NetClientState *nc)
339 {
340 if (nc->incoming_queue) {
341 qemu_del_net_queue(nc->incoming_queue);
342 }
343 if (nc->peer) {
344 nc->peer->peer = NULL;
345 }
346 g_free(nc->name);
347 g_free(nc->model);
348 if (nc->destructor) {
349 nc->destructor(nc);
350 }
351 }
352
353 void qemu_del_net_client(NetClientState *nc)
354 {
355 NetClientState *ncs[MAX_QUEUE_NUM];
356 int queues, i;
357 NetFilterState *nf, *next;
358
359 assert(nc->info->type != NET_CLIENT_DRIVER_NIC);
360
361 /* If the NetClientState belongs to a multiqueue backend, we will change all
362 * other NetClientStates also.
363 */
364 queues = qemu_find_net_clients_except(nc->name, ncs,
365 NET_CLIENT_DRIVER_NIC,
366 MAX_QUEUE_NUM);
367 assert(queues != 0);
368
369 QTAILQ_FOREACH_SAFE(nf, &nc->filters, next, next) {
370 object_unparent(OBJECT(nf));
371 }
372
373 /* If there is a peer NIC, delete and cleanup client, but do not free. */
374 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_NIC) {
375 NICState *nic = qemu_get_nic(nc->peer);
376 if (nic->peer_deleted) {
377 return;
378 }
379 nic->peer_deleted = true;
380
381 for (i = 0; i < queues; i++) {
382 ncs[i]->peer->link_down = true;
383 }
384
385 if (nc->peer->info->link_status_changed) {
386 nc->peer->info->link_status_changed(nc->peer);
387 }
388
389 for (i = 0; i < queues; i++) {
390 qemu_cleanup_net_client(ncs[i]);
391 }
392
393 return;
394 }
395
396 for (i = 0; i < queues; i++) {
397 qemu_cleanup_net_client(ncs[i]);
398 qemu_free_net_client(ncs[i]);
399 }
400 }
401
402 void qemu_del_nic(NICState *nic)
403 {
404 int i, queues = MAX(nic->conf->peers.queues, 1);
405
406 qemu_macaddr_set_free(&nic->conf->macaddr);
407
408 /* If this is a peer NIC and peer has already been deleted, free it now. */
409 if (nic->peer_deleted) {
410 for (i = 0; i < queues; i++) {
411 qemu_free_net_client(qemu_get_subqueue(nic, i)->peer);
412 }
413 }
414
415 for (i = queues - 1; i >= 0; i--) {
416 NetClientState *nc = qemu_get_subqueue(nic, i);
417
418 qemu_cleanup_net_client(nc);
419 qemu_free_net_client(nc);
420 }
421
422 g_free(nic);
423 }
424
425 void qemu_foreach_nic(qemu_nic_foreach func, void *opaque)
426 {
427 NetClientState *nc;
428
429 QTAILQ_FOREACH(nc, &net_clients, next) {
430 if (nc->info->type == NET_CLIENT_DRIVER_NIC) {
431 if (nc->queue_index == 0) {
432 func(qemu_get_nic(nc), opaque);
433 }
434 }
435 }
436 }
437
438 bool qemu_has_ufo(NetClientState *nc)
439 {
440 if (!nc || !nc->info->has_ufo) {
441 return false;
442 }
443
444 return nc->info->has_ufo(nc);
445 }
446
447 bool qemu_has_vnet_hdr(NetClientState *nc)
448 {
449 if (!nc || !nc->info->has_vnet_hdr) {
450 return false;
451 }
452
453 return nc->info->has_vnet_hdr(nc);
454 }
455
456 bool qemu_has_vnet_hdr_len(NetClientState *nc, int len)
457 {
458 if (!nc || !nc->info->has_vnet_hdr_len) {
459 return false;
460 }
461
462 return nc->info->has_vnet_hdr_len(nc, len);
463 }
464
465 void qemu_using_vnet_hdr(NetClientState *nc, bool enable)
466 {
467 if (!nc || !nc->info->using_vnet_hdr) {
468 return;
469 }
470
471 nc->info->using_vnet_hdr(nc, enable);
472 }
473
474 void qemu_set_offload(NetClientState *nc, int csum, int tso4, int tso6,
475 int ecn, int ufo)
476 {
477 if (!nc || !nc->info->set_offload) {
478 return;
479 }
480
481 nc->info->set_offload(nc, csum, tso4, tso6, ecn, ufo);
482 }
483
484 void qemu_set_vnet_hdr_len(NetClientState *nc, int len)
485 {
486 if (!nc || !nc->info->set_vnet_hdr_len) {
487 return;
488 }
489
490 nc->vnet_hdr_len = len;
491 nc->info->set_vnet_hdr_len(nc, len);
492 }
493
494 int qemu_set_vnet_le(NetClientState *nc, bool is_le)
495 {
496 #ifdef HOST_WORDS_BIGENDIAN
497 if (!nc || !nc->info->set_vnet_le) {
498 return -ENOSYS;
499 }
500
501 return nc->info->set_vnet_le(nc, is_le);
502 #else
503 return 0;
504 #endif
505 }
506
507 int qemu_set_vnet_be(NetClientState *nc, bool is_be)
508 {
509 #ifdef HOST_WORDS_BIGENDIAN
510 return 0;
511 #else
512 if (!nc || !nc->info->set_vnet_be) {
513 return -ENOSYS;
514 }
515
516 return nc->info->set_vnet_be(nc, is_be);
517 #endif
518 }
519
520 int qemu_can_send_packet(NetClientState *sender)
521 {
522 int vm_running = runstate_is_running();
523
524 if (!vm_running) {
525 return 0;
526 }
527
528 if (!sender->peer) {
529 return 1;
530 }
531
532 if (sender->peer->receive_disabled) {
533 return 0;
534 } else if (sender->peer->info->can_receive &&
535 !sender->peer->info->can_receive(sender->peer)) {
536 return 0;
537 }
538 return 1;
539 }
540
541 static ssize_t filter_receive_iov(NetClientState *nc,
542 NetFilterDirection direction,
543 NetClientState *sender,
544 unsigned flags,
545 const struct iovec *iov,
546 int iovcnt,
547 NetPacketSent *sent_cb)
548 {
549 ssize_t ret = 0;
550 NetFilterState *nf = NULL;
551
552 if (direction == NET_FILTER_DIRECTION_TX) {
553 QTAILQ_FOREACH(nf, &nc->filters, next) {
554 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov,
555 iovcnt, sent_cb);
556 if (ret) {
557 return ret;
558 }
559 }
560 } else {
561 QTAILQ_FOREACH_REVERSE(nf, &nc->filters, NetFilterHead, next) {
562 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov,
563 iovcnt, sent_cb);
564 if (ret) {
565 return ret;
566 }
567 }
568 }
569
570 return ret;
571 }
572
573 static ssize_t filter_receive(NetClientState *nc,
574 NetFilterDirection direction,
575 NetClientState *sender,
576 unsigned flags,
577 const uint8_t *data,
578 size_t size,
579 NetPacketSent *sent_cb)
580 {
581 struct iovec iov = {
582 .iov_base = (void *)data,
583 .iov_len = size
584 };
585
586 return filter_receive_iov(nc, direction, sender, flags, &iov, 1, sent_cb);
587 }
588
589 void qemu_purge_queued_packets(NetClientState *nc)
590 {
591 if (!nc->peer) {
592 return;
593 }
594
595 qemu_net_queue_purge(nc->peer->incoming_queue, nc);
596 }
597
598 void qemu_flush_or_purge_queued_packets(NetClientState *nc, bool purge)
599 {
600 nc->receive_disabled = 0;
601
602 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_HUBPORT) {
603 if (net_hub_flush(nc->peer)) {
604 qemu_notify_event();
605 }
606 }
607 if (qemu_net_queue_flush(nc->incoming_queue)) {
608 /* We emptied the queue successfully, signal to the IO thread to repoll
609 * the file descriptor (for tap, for example).
610 */
611 qemu_notify_event();
612 } else if (purge) {
613 /* Unable to empty the queue, purge remaining packets */
614 qemu_net_queue_purge(nc->incoming_queue, nc);
615 }
616 }
617
618 void qemu_flush_queued_packets(NetClientState *nc)
619 {
620 qemu_flush_or_purge_queued_packets(nc, false);
621 }
622
623 static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender,
624 unsigned flags,
625 const uint8_t *buf, int size,
626 NetPacketSent *sent_cb)
627 {
628 NetQueue *queue;
629 int ret;
630
631 #ifdef DEBUG_NET
632 printf("qemu_send_packet_async:\n");
633 qemu_hexdump((const char *)buf, stdout, "net", size);
634 #endif
635
636 if (sender->link_down || !sender->peer) {
637 return size;
638 }
639
640 /* Let filters handle the packet first */
641 ret = filter_receive(sender, NET_FILTER_DIRECTION_TX,
642 sender, flags, buf, size, sent_cb);
643 if (ret) {
644 return ret;
645 }
646
647 ret = filter_receive(sender->peer, NET_FILTER_DIRECTION_RX,
648 sender, flags, buf, size, sent_cb);
649 if (ret) {
650 return ret;
651 }
652
653 queue = sender->peer->incoming_queue;
654
655 return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb);
656 }
657
658 ssize_t qemu_send_packet_async(NetClientState *sender,
659 const uint8_t *buf, int size,
660 NetPacketSent *sent_cb)
661 {
662 return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE,
663 buf, size, sent_cb);
664 }
665
666 void qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size)
667 {
668 qemu_send_packet_async(nc, buf, size, NULL);
669 }
670
671 ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size)
672 {
673 return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW,
674 buf, size, NULL);
675 }
676
677 static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov,
678 int iovcnt, unsigned flags)
679 {
680 uint8_t *buf = NULL;
681 uint8_t *buffer;
682 size_t offset;
683 ssize_t ret;
684
685 if (iovcnt == 1) {
686 buffer = iov[0].iov_base;
687 offset = iov[0].iov_len;
688 } else {
689 offset = iov_size(iov, iovcnt);
690 if (offset > NET_BUFSIZE) {
691 return -1;
692 }
693 buf = g_malloc(offset);
694 buffer = buf;
695 offset = iov_to_buf(iov, iovcnt, 0, buf, offset);
696 }
697
698 if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) {
699 ret = nc->info->receive_raw(nc, buffer, offset);
700 } else {
701 ret = nc->info->receive(nc, buffer, offset);
702 }
703
704 g_free(buf);
705 return ret;
706 }
707
708 ssize_t qemu_deliver_packet_iov(NetClientState *sender,
709 unsigned flags,
710 const struct iovec *iov,
711 int iovcnt,
712 void *opaque)
713 {
714 NetClientState *nc = opaque;
715 size_t size = iov_size(iov, iovcnt);
716 int ret;
717
718 if (size > INT_MAX) {
719 return size;
720 }
721
722 if (nc->link_down) {
723 return size;
724 }
725
726 if (nc->receive_disabled) {
727 return 0;
728 }
729
730 if (nc->info->receive_iov && !(flags & QEMU_NET_PACKET_FLAG_RAW)) {
731 ret = nc->info->receive_iov(nc, iov, iovcnt);
732 } else {
733 ret = nc_sendv_compat(nc, iov, iovcnt, flags);
734 }
735
736 if (ret == 0) {
737 nc->receive_disabled = 1;
738 }
739
740 return ret;
741 }
742
743 ssize_t qemu_sendv_packet_async(NetClientState *sender,
744 const struct iovec *iov, int iovcnt,
745 NetPacketSent *sent_cb)
746 {
747 NetQueue *queue;
748 int ret;
749
750 if (sender->link_down || !sender->peer) {
751 return iov_size(iov, iovcnt);
752 }
753
754 /* Let filters handle the packet first */
755 ret = filter_receive_iov(sender, NET_FILTER_DIRECTION_TX, sender,
756 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb);
757 if (ret) {
758 return ret;
759 }
760
761 ret = filter_receive_iov(sender->peer, NET_FILTER_DIRECTION_RX, sender,
762 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb);
763 if (ret) {
764 return ret;
765 }
766
767 queue = sender->peer->incoming_queue;
768
769 return qemu_net_queue_send_iov(queue, sender,
770 QEMU_NET_PACKET_FLAG_NONE,
771 iov, iovcnt, sent_cb);
772 }
773
774 ssize_t
775 qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt)
776 {
777 return qemu_sendv_packet_async(nc, iov, iovcnt, NULL);
778 }
779
780 NetClientState *qemu_find_netdev(const char *id)
781 {
782 NetClientState *nc;
783
784 QTAILQ_FOREACH(nc, &net_clients, next) {
785 if (nc->info->type == NET_CLIENT_DRIVER_NIC)
786 continue;
787 if (!strcmp(nc->name, id)) {
788 return nc;
789 }
790 }
791
792 return NULL;
793 }
794
795 int qemu_find_net_clients_except(const char *id, NetClientState **ncs,
796 NetClientDriver type, int max)
797 {
798 NetClientState *nc;
799 int ret = 0;
800
801 QTAILQ_FOREACH(nc, &net_clients, next) {
802 if (nc->info->type == type) {
803 continue;
804 }
805 if (!id || !strcmp(nc->name, id)) {
806 if (ret < max) {
807 ncs[ret] = nc;
808 }
809 ret++;
810 }
811 }
812
813 return ret;
814 }
815
816 static int nic_get_free_idx(void)
817 {
818 int index;
819
820 for (index = 0; index < MAX_NICS; index++)
821 if (!nd_table[index].used)
822 return index;
823 return -1;
824 }
825
826 int qemu_show_nic_models(const char *arg, const char *const *models)
827 {
828 int i;
829
830 if (!arg || !is_help_option(arg)) {
831 return 0;
832 }
833
834 fprintf(stderr, "qemu: Supported NIC models: ");
835 for (i = 0 ; models[i]; i++)
836 fprintf(stderr, "%s%c", models[i], models[i+1] ? ',' : '\n');
837 return 1;
838 }
839
840 void qemu_check_nic_model(NICInfo *nd, const char *model)
841 {
842 const char *models[2];
843
844 models[0] = model;
845 models[1] = NULL;
846
847 if (qemu_show_nic_models(nd->model, models))
848 exit(0);
849 if (qemu_find_nic_model(nd, models, model) < 0)
850 exit(1);
851 }
852
853 int qemu_find_nic_model(NICInfo *nd, const char * const *models,
854 const char *default_model)
855 {
856 int i;
857
858 if (!nd->model)
859 nd->model = g_strdup(default_model);
860
861 for (i = 0 ; models[i]; i++) {
862 if (strcmp(nd->model, models[i]) == 0)
863 return i;
864 }
865
866 error_report("Unsupported NIC model: %s", nd->model);
867 return -1;
868 }
869
870 static int net_init_nic(const Netdev *netdev, const char *name,
871 NetClientState *peer, Error **errp)
872 {
873 int idx;
874 NICInfo *nd;
875 const NetLegacyNicOptions *nic;
876
877 assert(netdev->type == NET_CLIENT_DRIVER_NIC);
878 nic = &netdev->u.nic;
879
880 idx = nic_get_free_idx();
881 if (idx == -1 || nb_nics >= MAX_NICS) {
882 error_setg(errp, "too many NICs");
883 return -1;
884 }
885
886 nd = &nd_table[idx];
887
888 memset(nd, 0, sizeof(*nd));
889
890 if (nic->has_netdev) {
891 nd->netdev = qemu_find_netdev(nic->netdev);
892 if (!nd->netdev) {
893 error_setg(errp, "netdev '%s' not found", nic->netdev);
894 return -1;
895 }
896 } else {
897 assert(peer);
898 nd->netdev = peer;
899 }
900 nd->name = g_strdup(name);
901 if (nic->has_model) {
902 nd->model = g_strdup(nic->model);
903 }
904 if (nic->has_addr) {
905 nd->devaddr = g_strdup(nic->addr);
906 }
907
908 if (nic->has_macaddr &&
909 net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) {
910 error_setg(errp, "invalid syntax for ethernet address");
911 return -1;
912 }
913 if (nic->has_macaddr &&
914 is_multicast_ether_addr(nd->macaddr.a)) {
915 error_setg(errp,
916 "NIC cannot have multicast MAC address (odd 1st byte)");
917 return -1;
918 }
919 qemu_macaddr_default_if_unset(&nd->macaddr);
920
921 if (nic->has_vectors) {
922 if (nic->vectors > 0x7ffffff) {
923 error_setg(errp, "invalid # of vectors: %"PRIu32, nic->vectors);
924 return -1;
925 }
926 nd->nvectors = nic->vectors;
927 } else {
928 nd->nvectors = DEV_NVECTORS_UNSPECIFIED;
929 }
930
931 nd->used = 1;
932 nb_nics++;
933
934 return idx;
935 }
936
937
938 static int (* const net_client_init_fun[NET_CLIENT_DRIVER__MAX])(
939 const Netdev *netdev,
940 const char *name,
941 NetClientState *peer, Error **errp) = {
942 [NET_CLIENT_DRIVER_NIC] = net_init_nic,
943 #ifdef CONFIG_SLIRP
944 [NET_CLIENT_DRIVER_USER] = net_init_slirp,
945 #endif
946 [NET_CLIENT_DRIVER_TAP] = net_init_tap,
947 [NET_CLIENT_DRIVER_SOCKET] = net_init_socket,
948 #ifdef CONFIG_VDE
949 [NET_CLIENT_DRIVER_VDE] = net_init_vde,
950 #endif
951 #ifdef CONFIG_NETMAP
952 [NET_CLIENT_DRIVER_NETMAP] = net_init_netmap,
953 #endif
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_NIC ||
979 !net_client_init_fun[netdev->type]) {
980 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
981 "a netdev backend type");
982 return -1;
983 }
984 } else {
985 const NetLegacy *net = object;
986 const NetLegacyOptions *opts = net->opts;
987 legacy.id = net->id;
988 netdev = &legacy;
989 /* missing optional values have been initialized to "all bits zero" */
990 name = net->has_id ? net->id : net->name;
991
992 if (net->has_name) {
993 warn_report("The 'name' parameter is deprecated, use 'id' instead");
994 }
995
996 /* Map the old options to the new flat type */
997 switch (opts->type) {
998 case NET_LEGACY_OPTIONS_TYPE_NONE:
999 return 0; /* nothing to do */
1000 case NET_LEGACY_OPTIONS_TYPE_NIC:
1001 legacy.type = NET_CLIENT_DRIVER_NIC;
1002 legacy.u.nic = opts->u.nic;
1003 break;
1004 case NET_LEGACY_OPTIONS_TYPE_USER:
1005 legacy.type = NET_CLIENT_DRIVER_USER;
1006 legacy.u.user = opts->u.user;
1007 break;
1008 case NET_LEGACY_OPTIONS_TYPE_TAP:
1009 legacy.type = NET_CLIENT_DRIVER_TAP;
1010 legacy.u.tap = opts->u.tap;
1011 break;
1012 case NET_LEGACY_OPTIONS_TYPE_L2TPV3:
1013 legacy.type = NET_CLIENT_DRIVER_L2TPV3;
1014 legacy.u.l2tpv3 = opts->u.l2tpv3;
1015 break;
1016 case NET_LEGACY_OPTIONS_TYPE_SOCKET:
1017 legacy.type = NET_CLIENT_DRIVER_SOCKET;
1018 legacy.u.socket = opts->u.socket;
1019 break;
1020 case NET_LEGACY_OPTIONS_TYPE_VDE:
1021 legacy.type = NET_CLIENT_DRIVER_VDE;
1022 legacy.u.vde = opts->u.vde;
1023 break;
1024 case NET_LEGACY_OPTIONS_TYPE_BRIDGE:
1025 legacy.type = NET_CLIENT_DRIVER_BRIDGE;
1026 legacy.u.bridge = opts->u.bridge;
1027 break;
1028 case NET_LEGACY_OPTIONS_TYPE_NETMAP:
1029 legacy.type = NET_CLIENT_DRIVER_NETMAP;
1030 legacy.u.netmap = opts->u.netmap;
1031 break;
1032 case NET_LEGACY_OPTIONS_TYPE_VHOST_USER:
1033 legacy.type = NET_CLIENT_DRIVER_VHOST_USER;
1034 legacy.u.vhost_user = opts->u.vhost_user;
1035 break;
1036 default:
1037 abort();
1038 }
1039
1040 if (!net_client_init_fun[netdev->type]) {
1041 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
1042 "a net backend type (maybe it is not compiled "
1043 "into this binary)");
1044 return -1;
1045 }
1046
1047 /* Do not add to a hub if it's a nic with a netdev= parameter. */
1048 if (netdev->type != NET_CLIENT_DRIVER_NIC ||
1049 !opts->u.nic.has_netdev) {
1050 peer = net_hub_add_port(0, NULL, NULL);
1051 }
1052 }
1053
1054 if (net_client_init_fun[netdev->type](netdev, name, peer, errp) < 0) {
1055 /* FIXME drop when all init functions store an Error */
1056 if (errp && !*errp) {
1057 error_setg(errp, QERR_DEVICE_INIT_FAILED,
1058 NetClientDriver_str(netdev->type));
1059 }
1060 return -1;
1061 }
1062 return 0;
1063 }
1064
1065 static void show_netdevs(void)
1066 {
1067 int idx;
1068 const char *available_netdevs[] = {
1069 "socket",
1070 "hubport",
1071 "tap",
1072 #ifdef CONFIG_SLIRP
1073 "user",
1074 #endif
1075 #ifdef CONFIG_L2TPV3
1076 "l2tpv3",
1077 #endif
1078 #ifdef CONFIG_VDE
1079 "vde",
1080 #endif
1081 #ifdef CONFIG_NET_BRIDGE
1082 "bridge",
1083 #endif
1084 #ifdef CONFIG_NETMAP
1085 "netmap",
1086 #endif
1087 #ifdef CONFIG_POSIX
1088 "vhost-user",
1089 #endif
1090 };
1091
1092 printf("Available netdev backend types:\n");
1093 for (idx = 0; idx < ARRAY_SIZE(available_netdevs); idx++) {
1094 puts(available_netdevs[idx]);
1095 }
1096 }
1097
1098 static int net_client_init(QemuOpts *opts, bool is_netdev, Error **errp)
1099 {
1100 void *object = NULL;
1101 Error *err = NULL;
1102 int ret = -1;
1103 Visitor *v = opts_visitor_new(opts);
1104
1105 const char *type = qemu_opt_get(opts, "type");
1106
1107 if (is_netdev && type && is_help_option(type)) {
1108 show_netdevs();
1109 exit(0);
1110 } else {
1111 /* Parse convenience option format ip6-net=fec0::0[/64] */
1112 const char *ip6_net = qemu_opt_get(opts, "ipv6-net");
1113
1114 if (ip6_net) {
1115 char buf[strlen(ip6_net) + 1];
1116
1117 if (get_str_sep(buf, sizeof(buf), &ip6_net, '/') < 0) {
1118 /* Default 64bit prefix length. */
1119 qemu_opt_set(opts, "ipv6-prefix", ip6_net, &error_abort);
1120 qemu_opt_set_number(opts, "ipv6-prefixlen", 64, &error_abort);
1121 } else {
1122 /* User-specified prefix length. */
1123 unsigned long len;
1124 int err;
1125
1126 qemu_opt_set(opts, "ipv6-prefix", buf, &error_abort);
1127 err = qemu_strtoul(ip6_net, NULL, 10, &len);
1128
1129 if (err) {
1130 error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1131 "ipv6-prefix", "a number");
1132 } else {
1133 qemu_opt_set_number(opts, "ipv6-prefixlen", len,
1134 &error_abort);
1135 }
1136 }
1137 qemu_opt_unset(opts, "ipv6-net");
1138 }
1139 }
1140
1141 if (is_netdev) {
1142 visit_type_Netdev(v, NULL, (Netdev **)&object, &err);
1143 } else {
1144 visit_type_NetLegacy(v, NULL, (NetLegacy **)&object, &err);
1145 }
1146
1147 if (!err) {
1148 ret = net_client_init1(object, is_netdev, &err);
1149 }
1150
1151 if (is_netdev) {
1152 qapi_free_Netdev(object);
1153 } else {
1154 qapi_free_NetLegacy(object);
1155 }
1156
1157 error_propagate(errp, err);
1158 visit_free(v);
1159 return ret;
1160 }
1161
1162 void netdev_add(QemuOpts *opts, Error **errp)
1163 {
1164 net_client_init(opts, true, errp);
1165 }
1166
1167 void qmp_netdev_add(QDict *qdict, QObject **ret, Error **errp)
1168 {
1169 Error *local_err = NULL;
1170 QemuOptsList *opts_list;
1171 QemuOpts *opts;
1172
1173 opts_list = qemu_find_opts_err("netdev", &local_err);
1174 if (local_err) {
1175 goto out;
1176 }
1177
1178 opts = qemu_opts_from_qdict(opts_list, qdict, &local_err);
1179 if (local_err) {
1180 goto out;
1181 }
1182
1183 netdev_add(opts, &local_err);
1184 if (local_err) {
1185 qemu_opts_del(opts);
1186 goto out;
1187 }
1188
1189 out:
1190 error_propagate(errp, local_err);
1191 }
1192
1193 void qmp_netdev_del(const char *id, Error **errp)
1194 {
1195 NetClientState *nc;
1196 QemuOpts *opts;
1197
1198 nc = qemu_find_netdev(id);
1199 if (!nc) {
1200 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1201 "Device '%s' not found", id);
1202 return;
1203 }
1204
1205 opts = qemu_opts_find(qemu_find_opts_err("netdev", NULL), id);
1206 if (!opts) {
1207 error_setg(errp, "Device '%s' is not a netdev", id);
1208 return;
1209 }
1210
1211 qemu_del_net_client(nc);
1212 qemu_opts_del(opts);
1213 }
1214
1215 static void netfilter_print_info(Monitor *mon, NetFilterState *nf)
1216 {
1217 char *str;
1218 ObjectProperty *prop;
1219 ObjectPropertyIterator iter;
1220 Visitor *v;
1221
1222 /* generate info str */
1223 object_property_iter_init(&iter, OBJECT(nf));
1224 while ((prop = object_property_iter_next(&iter))) {
1225 if (!strcmp(prop->name, "type")) {
1226 continue;
1227 }
1228 v = string_output_visitor_new(false, &str);
1229 object_property_get(OBJECT(nf), v, prop->name, NULL);
1230 visit_complete(v, &str);
1231 visit_free(v);
1232 monitor_printf(mon, ",%s=%s", prop->name, str);
1233 g_free(str);
1234 }
1235 monitor_printf(mon, "\n");
1236 }
1237
1238 void print_net_client(Monitor *mon, NetClientState *nc)
1239 {
1240 NetFilterState *nf;
1241
1242 monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name,
1243 nc->queue_index,
1244 NetClientDriver_str(nc->info->type),
1245 nc->info_str);
1246 if (!QTAILQ_EMPTY(&nc->filters)) {
1247 monitor_printf(mon, "filters:\n");
1248 }
1249 QTAILQ_FOREACH(nf, &nc->filters, next) {
1250 char *path = object_get_canonical_path_component(OBJECT(nf));
1251
1252 monitor_printf(mon, " - %s: type=%s", path,
1253 object_get_typename(OBJECT(nf)));
1254 netfilter_print_info(mon, nf);
1255 g_free(path);
1256 }
1257 }
1258
1259 RxFilterInfoList *qmp_query_rx_filter(bool has_name, const char *name,
1260 Error **errp)
1261 {
1262 NetClientState *nc;
1263 RxFilterInfoList *filter_list = NULL, *last_entry = NULL;
1264
1265 QTAILQ_FOREACH(nc, &net_clients, next) {
1266 RxFilterInfoList *entry;
1267 RxFilterInfo *info;
1268
1269 if (has_name && strcmp(nc->name, name) != 0) {
1270 continue;
1271 }
1272
1273 /* only query rx-filter information of NIC */
1274 if (nc->info->type != NET_CLIENT_DRIVER_NIC) {
1275 if (has_name) {
1276 error_setg(errp, "net client(%s) isn't a NIC", name);
1277 return NULL;
1278 }
1279 continue;
1280 }
1281
1282 /* only query information on queue 0 since the info is per nic,
1283 * not per queue
1284 */
1285 if (nc->queue_index != 0)
1286 continue;
1287
1288 if (nc->info->query_rx_filter) {
1289 info = nc->info->query_rx_filter(nc);
1290 entry = g_malloc0(sizeof(*entry));
1291 entry->value = info;
1292
1293 if (!filter_list) {
1294 filter_list = entry;
1295 } else {
1296 last_entry->next = entry;
1297 }
1298 last_entry = entry;
1299 } else if (has_name) {
1300 error_setg(errp, "net client(%s) doesn't support"
1301 " rx-filter querying", name);
1302 return NULL;
1303 }
1304
1305 if (has_name) {
1306 break;
1307 }
1308 }
1309
1310 if (filter_list == NULL && has_name) {
1311 error_setg(errp, "invalid net client name: %s", name);
1312 }
1313
1314 return filter_list;
1315 }
1316
1317 void hmp_info_network(Monitor *mon, const QDict *qdict)
1318 {
1319 NetClientState *nc, *peer;
1320 NetClientDriver type;
1321
1322 net_hub_info(mon);
1323
1324 QTAILQ_FOREACH(nc, &net_clients, next) {
1325 peer = nc->peer;
1326 type = nc->info->type;
1327
1328 /* Skip if already printed in hub info */
1329 if (net_hub_id_for_client(nc, NULL) == 0) {
1330 continue;
1331 }
1332
1333 if (!peer || type == NET_CLIENT_DRIVER_NIC) {
1334 print_net_client(mon, nc);
1335 } /* else it's a netdev connected to a NIC, printed with the NIC */
1336 if (peer && type == NET_CLIENT_DRIVER_NIC) {
1337 monitor_printf(mon, " \\ ");
1338 print_net_client(mon, peer);
1339 }
1340 }
1341 }
1342
1343 void colo_notify_filters_event(int event, Error **errp)
1344 {
1345 NetClientState *nc;
1346 NetFilterState *nf;
1347 NetFilterClass *nfc = NULL;
1348 Error *local_err = NULL;
1349
1350 QTAILQ_FOREACH(nc, &net_clients, next) {
1351 QTAILQ_FOREACH(nf, &nc->filters, next) {
1352 nfc = NETFILTER_GET_CLASS(OBJECT(nf));
1353 nfc->handle_event(nf, event, &local_err);
1354 if (local_err) {
1355 error_propagate(errp, local_err);
1356 return;
1357 }
1358 }
1359 }
1360 }
1361
1362 void qmp_set_link(const char *name, bool up, Error **errp)
1363 {
1364 NetClientState *ncs[MAX_QUEUE_NUM];
1365 NetClientState *nc;
1366 int queues, i;
1367
1368 queues = qemu_find_net_clients_except(name, ncs,
1369 NET_CLIENT_DRIVER__MAX,
1370 MAX_QUEUE_NUM);
1371
1372 if (queues == 0) {
1373 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1374 "Device '%s' not found", name);
1375 return;
1376 }
1377 nc = ncs[0];
1378
1379 for (i = 0; i < queues; i++) {
1380 ncs[i]->link_down = !up;
1381 }
1382
1383 if (nc->info->link_status_changed) {
1384 nc->info->link_status_changed(nc);
1385 }
1386
1387 if (nc->peer) {
1388 /* Change peer link only if the peer is NIC and then notify peer.
1389 * If the peer is a HUBPORT or a backend, we do not change the
1390 * link status.
1391 *
1392 * This behavior is compatible with qemu hubs where there could be
1393 * multiple clients that can still communicate with each other in
1394 * disconnected mode. For now maintain this compatibility.
1395 */
1396 if (nc->peer->info->type == NET_CLIENT_DRIVER_NIC) {
1397 for (i = 0; i < queues; i++) {
1398 ncs[i]->peer->link_down = !up;
1399 }
1400 }
1401 if (nc->peer->info->link_status_changed) {
1402 nc->peer->info->link_status_changed(nc->peer);
1403 }
1404 }
1405 }
1406
1407 static void net_vm_change_state_handler(void *opaque, int running,
1408 RunState state)
1409 {
1410 NetClientState *nc;
1411 NetClientState *tmp;
1412
1413 QTAILQ_FOREACH_SAFE(nc, &net_clients, next, tmp) {
1414 if (running) {
1415 /* Flush queued packets and wake up backends. */
1416 if (nc->peer && qemu_can_send_packet(nc)) {
1417 qemu_flush_queued_packets(nc->peer);
1418 }
1419 } else {
1420 /* Complete all queued packets, to guarantee we don't modify
1421 * state later when VM is not running.
1422 */
1423 qemu_flush_or_purge_queued_packets(nc, true);
1424 }
1425 }
1426 }
1427
1428 void net_cleanup(void)
1429 {
1430 NetClientState *nc;
1431
1432 /* We may del multiple entries during qemu_del_net_client(),
1433 * so QTAILQ_FOREACH_SAFE() is also not safe here.
1434 */
1435 while (!QTAILQ_EMPTY(&net_clients)) {
1436 nc = QTAILQ_FIRST(&net_clients);
1437 if (nc->info->type == NET_CLIENT_DRIVER_NIC) {
1438 qemu_del_nic(qemu_get_nic(nc));
1439 } else {
1440 qemu_del_net_client(nc);
1441 }
1442 }
1443
1444 qemu_del_vm_change_state_handler(net_change_state_entry);
1445 }
1446
1447 void net_check_clients(void)
1448 {
1449 NetClientState *nc;
1450 int i;
1451
1452 net_hub_check_clients();
1453
1454 QTAILQ_FOREACH(nc, &net_clients, next) {
1455 if (!nc->peer) {
1456 warn_report("%s %s has no peer",
1457 nc->info->type == NET_CLIENT_DRIVER_NIC
1458 ? "nic" : "netdev",
1459 nc->name);
1460 }
1461 }
1462
1463 /* Check that all NICs requested via -net nic actually got created.
1464 * NICs created via -device don't need to be checked here because
1465 * they are always instantiated.
1466 */
1467 for (i = 0; i < MAX_NICS; i++) {
1468 NICInfo *nd = &nd_table[i];
1469 if (nd->used && !nd->instantiated) {
1470 warn_report("requested NIC (%s, model %s) "
1471 "was not created (not supported by this machine?)",
1472 nd->name ? nd->name : "anonymous",
1473 nd->model ? nd->model : "unspecified");
1474 }
1475 }
1476 }
1477
1478 static int net_init_client(void *dummy, QemuOpts *opts, Error **errp)
1479 {
1480 return net_client_init(opts, false, errp);
1481 }
1482
1483 static int net_init_netdev(void *dummy, QemuOpts *opts, Error **errp)
1484 {
1485 return net_client_init(opts, true, errp);
1486 }
1487
1488 /* For the convenience "--nic" parameter */
1489 static int net_param_nic(void *dummy, QemuOpts *opts, Error **errp)
1490 {
1491 char *mac, *nd_id;
1492 int idx, ret;
1493 NICInfo *ni;
1494 const char *type;
1495
1496 type = qemu_opt_get(opts, "type");
1497 if (type && g_str_equal(type, "none")) {
1498 return 0; /* Nothing to do, default_net is cleared in vl.c */
1499 }
1500
1501 idx = nic_get_free_idx();
1502 if (idx == -1 || nb_nics >= MAX_NICS) {
1503 error_setg(errp, "no more on-board/default NIC slots available");
1504 return -1;
1505 }
1506
1507 if (!type) {
1508 qemu_opt_set(opts, "type", "user", &error_abort);
1509 }
1510
1511 ni = &nd_table[idx];
1512 memset(ni, 0, sizeof(*ni));
1513 ni->model = qemu_opt_get_del(opts, "model");
1514
1515 /* Create an ID if the user did not specify one */
1516 nd_id = g_strdup(qemu_opts_id(opts));
1517 if (!nd_id) {
1518 nd_id = g_strdup_printf("__org.qemu.nic%i\n", idx);
1519 qemu_opts_set_id(opts, nd_id);
1520 }
1521
1522 /* Handle MAC address */
1523 mac = qemu_opt_get_del(opts, "mac");
1524 if (mac) {
1525 ret = net_parse_macaddr(ni->macaddr.a, mac);
1526 g_free(mac);
1527 if (ret) {
1528 error_setg(errp, "invalid syntax for ethernet address");
1529 goto out;
1530 }
1531 if (is_multicast_ether_addr(ni->macaddr.a)) {
1532 error_setg(errp, "NIC cannot have multicast MAC address");
1533 ret = -1;
1534 goto out;
1535 }
1536 }
1537 qemu_macaddr_default_if_unset(&ni->macaddr);
1538
1539 ret = net_client_init(opts, true, errp);
1540 if (ret == 0) {
1541 ni->netdev = qemu_find_netdev(nd_id);
1542 ni->used = true;
1543 nb_nics++;
1544 }
1545
1546 out:
1547 g_free(nd_id);
1548 return ret;
1549 }
1550
1551 int net_init_clients(Error **errp)
1552 {
1553 net_change_state_entry =
1554 qemu_add_vm_change_state_handler(net_vm_change_state_handler, NULL);
1555
1556 QTAILQ_INIT(&net_clients);
1557
1558 if (qemu_opts_foreach(qemu_find_opts("netdev"),
1559 net_init_netdev, NULL, errp)) {
1560 return -1;
1561 }
1562
1563 if (qemu_opts_foreach(qemu_find_opts("nic"), net_param_nic, NULL, errp)) {
1564 return -1;
1565 }
1566
1567 if (qemu_opts_foreach(qemu_find_opts("net"), net_init_client, NULL, errp)) {
1568 return -1;
1569 }
1570
1571 return 0;
1572 }
1573
1574 int net_client_parse(QemuOptsList *opts_list, const char *optarg)
1575 {
1576 if (!qemu_opts_parse_noisily(opts_list, optarg, true)) {
1577 return -1;
1578 }
1579
1580 return 0;
1581 }
1582
1583 /* From FreeBSD */
1584 /* XXX: optimize */
1585 uint32_t net_crc32(const uint8_t *p, int len)
1586 {
1587 uint32_t crc;
1588 int carry, i, j;
1589 uint8_t b;
1590
1591 crc = 0xffffffff;
1592 for (i = 0; i < len; i++) {
1593 b = *p++;
1594 for (j = 0; j < 8; j++) {
1595 carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01);
1596 crc <<= 1;
1597 b >>= 1;
1598 if (carry) {
1599 crc = ((crc ^ POLYNOMIAL_BE) | carry);
1600 }
1601 }
1602 }
1603
1604 return crc;
1605 }
1606
1607 uint32_t net_crc32_le(const uint8_t *p, int len)
1608 {
1609 uint32_t crc;
1610 int carry, i, j;
1611 uint8_t b;
1612
1613 crc = 0xffffffff;
1614 for (i = 0; i < len; i++) {
1615 b = *p++;
1616 for (j = 0; j < 8; j++) {
1617 carry = (crc & 0x1) ^ (b & 0x01);
1618 crc >>= 1;
1619 b >>= 1;
1620 if (carry) {
1621 crc ^= POLYNOMIAL_LE;
1622 }
1623 }
1624 }
1625
1626 return crc;
1627 }
1628
1629 QemuOptsList qemu_netdev_opts = {
1630 .name = "netdev",
1631 .implied_opt_name = "type",
1632 .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head),
1633 .desc = {
1634 /*
1635 * no elements => accept any params
1636 * validation will happen later
1637 */
1638 { /* end of list */ }
1639 },
1640 };
1641
1642 QemuOptsList qemu_nic_opts = {
1643 .name = "nic",
1644 .implied_opt_name = "type",
1645 .head = QTAILQ_HEAD_INITIALIZER(qemu_nic_opts.head),
1646 .desc = {
1647 /*
1648 * no elements => accept any params
1649 * validation will happen later
1650 */
1651 { /* end of list */ }
1652 },
1653 };
1654
1655 QemuOptsList qemu_net_opts = {
1656 .name = "net",
1657 .implied_opt_name = "type",
1658 .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head),
1659 .desc = {
1660 /*
1661 * no elements => accept any params
1662 * validation will happen later
1663 */
1664 { /* end of list */ }
1665 },
1666 };
1667
1668 void net_socket_rs_init(SocketReadState *rs,
1669 SocketReadStateFinalize *finalize,
1670 bool vnet_hdr)
1671 {
1672 rs->state = 0;
1673 rs->vnet_hdr = vnet_hdr;
1674 rs->index = 0;
1675 rs->packet_len = 0;
1676 rs->vnet_hdr_len = 0;
1677 memset(rs->buf, 0, sizeof(rs->buf));
1678 rs->finalize = finalize;
1679 }
1680
1681 /*
1682 * Returns
1683 * 0: success
1684 * -1: error occurs
1685 */
1686 int net_fill_rstate(SocketReadState *rs, const uint8_t *buf, int size)
1687 {
1688 unsigned int l;
1689
1690 while (size > 0) {
1691 /* Reassemble a packet from the network.
1692 * 0 = getting length.
1693 * 1 = getting vnet header length.
1694 * 2 = getting data.
1695 */
1696 switch (rs->state) {
1697 case 0:
1698 l = 4 - rs->index;
1699 if (l > size) {
1700 l = size;
1701 }
1702 memcpy(rs->buf + rs->index, buf, l);
1703 buf += l;
1704 size -= l;
1705 rs->index += l;
1706 if (rs->index == 4) {
1707 /* got length */
1708 rs->packet_len = ntohl(*(uint32_t *)rs->buf);
1709 rs->index = 0;
1710 if (rs->vnet_hdr) {
1711 rs->state = 1;
1712 } else {
1713 rs->state = 2;
1714 rs->vnet_hdr_len = 0;
1715 }
1716 }
1717 break;
1718 case 1:
1719 l = 4 - rs->index;
1720 if (l > size) {
1721 l = size;
1722 }
1723 memcpy(rs->buf + rs->index, buf, l);
1724 buf += l;
1725 size -= l;
1726 rs->index += l;
1727 if (rs->index == 4) {
1728 /* got vnet header length */
1729 rs->vnet_hdr_len = ntohl(*(uint32_t *)rs->buf);
1730 rs->index = 0;
1731 rs->state = 2;
1732 }
1733 break;
1734 case 2:
1735 l = rs->packet_len - rs->index;
1736 if (l > size) {
1737 l = size;
1738 }
1739 if (rs->index + l <= sizeof(rs->buf)) {
1740 memcpy(rs->buf + rs->index, buf, l);
1741 } else {
1742 fprintf(stderr, "serious error: oversized packet received,"
1743 "connection terminated.\n");
1744 rs->index = rs->state = 0;
1745 return -1;
1746 }
1747
1748 rs->index += l;
1749 buf += l;
1750 size -= l;
1751 if (rs->index >= rs->packet_len) {
1752 rs->index = 0;
1753 rs->state = 0;
1754 assert(rs->finalize);
1755 rs->finalize(rs);
1756 }
1757 break;
1758 }
1759 }
1760
1761 assert(size == 0);
1762 return 0;
1763 }