linux-user, nios2: sync syscall numbers with kernel v5.5
[qemu.git] / net / net.c
1 /*
2 * QEMU System Emulator
3 *
4 * Copyright (c) 2003-2008 Fabrice Bellard
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22 * THE SOFTWARE.
23 */
24
25 #include "qemu/osdep.h"
26
27 #include "net/net.h"
28 #include "clients.h"
29 #include "hub.h"
30 #include "hw/qdev-properties.h"
31 #include "net/slirp.h"
32 #include "net/eth.h"
33 #include "util.h"
34
35 #include "monitor/monitor.h"
36 #include "qemu/help_option.h"
37 #include "qapi/qapi-commands-net.h"
38 #include "qapi/qapi-visit-net.h"
39 #include "qapi/qmp/qdict.h"
40 #include "qapi/qmp/qerror.h"
41 #include "qemu/error-report.h"
42 #include "qemu/sockets.h"
43 #include "qemu/cutils.h"
44 #include "qemu/config-file.h"
45 #include "qemu/ctype.h"
46 #include "qemu/iov.h"
47 #include "qemu/main-loop.h"
48 #include "qemu/option.h"
49 #include "qapi/error.h"
50 #include "qapi/opts-visitor.h"
51 #include "sysemu/sysemu.h"
52 #include "sysemu/qtest.h"
53 #include "sysemu/runstate.h"
54 #include "sysemu/sysemu.h"
55 #include "net/filter.h"
56 #include "qapi/string-output-visitor.h"
57
58 /* Net bridge is currently not supported for W32. */
59 #if !defined(_WIN32)
60 # define CONFIG_NET_BRIDGE
61 #endif
62
63 static VMChangeStateEntry *net_change_state_entry;
64 static QTAILQ_HEAD(, NetClientState) net_clients;
65
66 /***********************************************************/
67 /* network device redirectors */
68
69 int parse_host_port(struct sockaddr_in *saddr, const char *str,
70 Error **errp)
71 {
72 gchar **substrings;
73 struct hostent *he;
74 const char *addr, *p, *r;
75 int port, ret = 0;
76
77 substrings = g_strsplit(str, ":", 2);
78 if (!substrings || !substrings[0] || !substrings[1]) {
79 error_setg(errp, "host address '%s' doesn't contain ':' "
80 "separating host from port", str);
81 ret = -1;
82 goto out;
83 }
84
85 addr = substrings[0];
86 p = substrings[1];
87
88 saddr->sin_family = AF_INET;
89 if (addr[0] == '\0') {
90 saddr->sin_addr.s_addr = 0;
91 } else {
92 if (qemu_isdigit(addr[0])) {
93 if (!inet_aton(addr, &saddr->sin_addr)) {
94 error_setg(errp, "host address '%s' is not a valid "
95 "IPv4 address", addr);
96 ret = -1;
97 goto out;
98 }
99 } else {
100 he = gethostbyname(addr);
101 if (he == NULL) {
102 error_setg(errp, "can't resolve host address '%s'", addr);
103 ret = -1;
104 goto out;
105 }
106 saddr->sin_addr = *(struct in_addr *)he->h_addr;
107 }
108 }
109 port = strtol(p, (char **)&r, 0);
110 if (r == p) {
111 error_setg(errp, "port number '%s' is invalid", p);
112 ret = -1;
113 goto out;
114 }
115 saddr->sin_port = htons(port);
116
117 out:
118 g_strfreev(substrings);
119 return ret;
120 }
121
122 char *qemu_mac_strdup_printf(const uint8_t *macaddr)
123 {
124 return g_strdup_printf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x",
125 macaddr[0], macaddr[1], macaddr[2],
126 macaddr[3], macaddr[4], macaddr[5]);
127 }
128
129 void qemu_format_nic_info_str(NetClientState *nc, uint8_t macaddr[6])
130 {
131 snprintf(nc->info_str, sizeof(nc->info_str),
132 "model=%s,macaddr=%02x:%02x:%02x:%02x:%02x:%02x",
133 nc->model,
134 macaddr[0], macaddr[1], macaddr[2],
135 macaddr[3], macaddr[4], macaddr[5]);
136 }
137
138 static int mac_table[256] = {0};
139
140 static void qemu_macaddr_set_used(MACAddr *macaddr)
141 {
142 int index;
143
144 for (index = 0x56; index < 0xFF; index++) {
145 if (macaddr->a[5] == index) {
146 mac_table[index]++;
147 }
148 }
149 }
150
151 static void qemu_macaddr_set_free(MACAddr *macaddr)
152 {
153 int index;
154 static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } };
155
156 if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) {
157 return;
158 }
159 for (index = 0x56; index < 0xFF; index++) {
160 if (macaddr->a[5] == index) {
161 mac_table[index]--;
162 }
163 }
164 }
165
166 static int qemu_macaddr_get_free(void)
167 {
168 int index;
169
170 for (index = 0x56; index < 0xFF; index++) {
171 if (mac_table[index] == 0) {
172 return index;
173 }
174 }
175
176 return -1;
177 }
178
179 void qemu_macaddr_default_if_unset(MACAddr *macaddr)
180 {
181 static const MACAddr zero = { .a = { 0,0,0,0,0,0 } };
182 static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } };
183
184 if (memcmp(macaddr, &zero, sizeof(zero)) != 0) {
185 if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) {
186 return;
187 } else {
188 qemu_macaddr_set_used(macaddr);
189 return;
190 }
191 }
192
193 macaddr->a[0] = 0x52;
194 macaddr->a[1] = 0x54;
195 macaddr->a[2] = 0x00;
196 macaddr->a[3] = 0x12;
197 macaddr->a[4] = 0x34;
198 macaddr->a[5] = qemu_macaddr_get_free();
199 qemu_macaddr_set_used(macaddr);
200 }
201
202 /**
203 * Generate a name for net client
204 *
205 * Only net clients created with the legacy -net option and NICs need this.
206 */
207 static char *assign_name(NetClientState *nc1, const char *model)
208 {
209 NetClientState *nc;
210 int id = 0;
211
212 QTAILQ_FOREACH(nc, &net_clients, next) {
213 if (nc == nc1) {
214 continue;
215 }
216 if (strcmp(nc->model, model) == 0) {
217 id++;
218 }
219 }
220
221 return g_strdup_printf("%s.%d", model, id);
222 }
223
224 static void qemu_net_client_destructor(NetClientState *nc)
225 {
226 g_free(nc);
227 }
228 static ssize_t qemu_deliver_packet_iov(NetClientState *sender,
229 unsigned flags,
230 const struct iovec *iov,
231 int iovcnt,
232 void *opaque);
233
234 static void qemu_net_client_setup(NetClientState *nc,
235 NetClientInfo *info,
236 NetClientState *peer,
237 const char *model,
238 const char *name,
239 NetClientDestructor *destructor)
240 {
241 nc->info = info;
242 nc->model = g_strdup(model);
243 if (name) {
244 nc->name = g_strdup(name);
245 } else {
246 nc->name = assign_name(nc, model);
247 }
248
249 if (peer) {
250 assert(!peer->peer);
251 nc->peer = peer;
252 peer->peer = nc;
253 }
254 QTAILQ_INSERT_TAIL(&net_clients, nc, next);
255
256 nc->incoming_queue = qemu_new_net_queue(qemu_deliver_packet_iov, nc);
257 nc->destructor = destructor;
258 QTAILQ_INIT(&nc->filters);
259 }
260
261 NetClientState *qemu_new_net_client(NetClientInfo *info,
262 NetClientState *peer,
263 const char *model,
264 const char *name)
265 {
266 NetClientState *nc;
267
268 assert(info->size >= sizeof(NetClientState));
269
270 nc = g_malloc0(info->size);
271 qemu_net_client_setup(nc, info, peer, model, name,
272 qemu_net_client_destructor);
273
274 return nc;
275 }
276
277 NICState *qemu_new_nic(NetClientInfo *info,
278 NICConf *conf,
279 const char *model,
280 const char *name,
281 void *opaque)
282 {
283 NetClientState **peers = conf->peers.ncs;
284 NICState *nic;
285 int i, queues = MAX(1, conf->peers.queues);
286
287 assert(info->type == NET_CLIENT_DRIVER_NIC);
288 assert(info->size >= sizeof(NICState));
289
290 nic = g_malloc0(info->size + sizeof(NetClientState) * queues);
291 nic->ncs = (void *)nic + info->size;
292 nic->conf = conf;
293 nic->opaque = opaque;
294
295 for (i = 0; i < queues; i++) {
296 qemu_net_client_setup(&nic->ncs[i], info, peers[i], model, name,
297 NULL);
298 nic->ncs[i].queue_index = i;
299 }
300
301 return nic;
302 }
303
304 NetClientState *qemu_get_subqueue(NICState *nic, int queue_index)
305 {
306 return nic->ncs + queue_index;
307 }
308
309 NetClientState *qemu_get_queue(NICState *nic)
310 {
311 return qemu_get_subqueue(nic, 0);
312 }
313
314 NICState *qemu_get_nic(NetClientState *nc)
315 {
316 NetClientState *nc0 = nc - nc->queue_index;
317
318 return (NICState *)((void *)nc0 - nc->info->size);
319 }
320
321 void *qemu_get_nic_opaque(NetClientState *nc)
322 {
323 NICState *nic = qemu_get_nic(nc);
324
325 return nic->opaque;
326 }
327
328 static void qemu_cleanup_net_client(NetClientState *nc)
329 {
330 QTAILQ_REMOVE(&net_clients, nc, next);
331
332 if (nc->info->cleanup) {
333 nc->info->cleanup(nc);
334 }
335 }
336
337 static void qemu_free_net_client(NetClientState *nc)
338 {
339 if (nc->incoming_queue) {
340 qemu_del_net_queue(nc->incoming_queue);
341 }
342 if (nc->peer) {
343 nc->peer->peer = NULL;
344 }
345 g_free(nc->name);
346 g_free(nc->model);
347 if (nc->destructor) {
348 nc->destructor(nc);
349 }
350 }
351
352 void qemu_del_net_client(NetClientState *nc)
353 {
354 NetClientState *ncs[MAX_QUEUE_NUM];
355 int queues, i;
356 NetFilterState *nf, *next;
357
358 assert(nc->info->type != NET_CLIENT_DRIVER_NIC);
359
360 /* If the NetClientState belongs to a multiqueue backend, we will change all
361 * other NetClientStates also.
362 */
363 queues = qemu_find_net_clients_except(nc->name, ncs,
364 NET_CLIENT_DRIVER_NIC,
365 MAX_QUEUE_NUM);
366 assert(queues != 0);
367
368 QTAILQ_FOREACH_SAFE(nf, &nc->filters, next, next) {
369 object_unparent(OBJECT(nf));
370 }
371
372 /* If there is a peer NIC, delete and cleanup client, but do not free. */
373 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_NIC) {
374 NICState *nic = qemu_get_nic(nc->peer);
375 if (nic->peer_deleted) {
376 return;
377 }
378 nic->peer_deleted = true;
379
380 for (i = 0; i < queues; i++) {
381 ncs[i]->peer->link_down = true;
382 }
383
384 if (nc->peer->info->link_status_changed) {
385 nc->peer->info->link_status_changed(nc->peer);
386 }
387
388 for (i = 0; i < queues; i++) {
389 qemu_cleanup_net_client(ncs[i]);
390 }
391
392 return;
393 }
394
395 for (i = 0; i < queues; i++) {
396 qemu_cleanup_net_client(ncs[i]);
397 qemu_free_net_client(ncs[i]);
398 }
399 }
400
401 void qemu_del_nic(NICState *nic)
402 {
403 int i, queues = MAX(nic->conf->peers.queues, 1);
404
405 qemu_macaddr_set_free(&nic->conf->macaddr);
406
407 /* If this is a peer NIC and peer has already been deleted, free it now. */
408 if (nic->peer_deleted) {
409 for (i = 0; i < queues; i++) {
410 qemu_free_net_client(qemu_get_subqueue(nic, i)->peer);
411 }
412 }
413
414 for (i = queues - 1; i >= 0; i--) {
415 NetClientState *nc = qemu_get_subqueue(nic, i);
416
417 qemu_cleanup_net_client(nc);
418 qemu_free_net_client(nc);
419 }
420
421 g_free(nic);
422 }
423
424 void qemu_foreach_nic(qemu_nic_foreach func, void *opaque)
425 {
426 NetClientState *nc;
427
428 QTAILQ_FOREACH(nc, &net_clients, next) {
429 if (nc->info->type == NET_CLIENT_DRIVER_NIC) {
430 if (nc->queue_index == 0) {
431 func(qemu_get_nic(nc), opaque);
432 }
433 }
434 }
435 }
436
437 bool qemu_has_ufo(NetClientState *nc)
438 {
439 if (!nc || !nc->info->has_ufo) {
440 return false;
441 }
442
443 return nc->info->has_ufo(nc);
444 }
445
446 bool qemu_has_vnet_hdr(NetClientState *nc)
447 {
448 if (!nc || !nc->info->has_vnet_hdr) {
449 return false;
450 }
451
452 return nc->info->has_vnet_hdr(nc);
453 }
454
455 bool qemu_has_vnet_hdr_len(NetClientState *nc, int len)
456 {
457 if (!nc || !nc->info->has_vnet_hdr_len) {
458 return false;
459 }
460
461 return nc->info->has_vnet_hdr_len(nc, len);
462 }
463
464 void qemu_using_vnet_hdr(NetClientState *nc, bool enable)
465 {
466 if (!nc || !nc->info->using_vnet_hdr) {
467 return;
468 }
469
470 nc->info->using_vnet_hdr(nc, enable);
471 }
472
473 void qemu_set_offload(NetClientState *nc, int csum, int tso4, int tso6,
474 int ecn, int ufo)
475 {
476 if (!nc || !nc->info->set_offload) {
477 return;
478 }
479
480 nc->info->set_offload(nc, csum, tso4, tso6, ecn, ufo);
481 }
482
483 void qemu_set_vnet_hdr_len(NetClientState *nc, int len)
484 {
485 if (!nc || !nc->info->set_vnet_hdr_len) {
486 return;
487 }
488
489 nc->vnet_hdr_len = len;
490 nc->info->set_vnet_hdr_len(nc, len);
491 }
492
493 int qemu_set_vnet_le(NetClientState *nc, bool is_le)
494 {
495 #ifdef HOST_WORDS_BIGENDIAN
496 if (!nc || !nc->info->set_vnet_le) {
497 return -ENOSYS;
498 }
499
500 return nc->info->set_vnet_le(nc, is_le);
501 #else
502 return 0;
503 #endif
504 }
505
506 int qemu_set_vnet_be(NetClientState *nc, bool is_be)
507 {
508 #ifdef HOST_WORDS_BIGENDIAN
509 return 0;
510 #else
511 if (!nc || !nc->info->set_vnet_be) {
512 return -ENOSYS;
513 }
514
515 return nc->info->set_vnet_be(nc, is_be);
516 #endif
517 }
518
519 int qemu_can_send_packet(NetClientState *sender)
520 {
521 int vm_running = runstate_is_running();
522
523 if (!vm_running) {
524 return 0;
525 }
526
527 if (!sender->peer) {
528 return 1;
529 }
530
531 if (sender->peer->receive_disabled) {
532 return 0;
533 } else if (sender->peer->info->can_receive &&
534 !sender->peer->info->can_receive(sender->peer)) {
535 return 0;
536 }
537 return 1;
538 }
539
540 static ssize_t filter_receive_iov(NetClientState *nc,
541 NetFilterDirection direction,
542 NetClientState *sender,
543 unsigned flags,
544 const struct iovec *iov,
545 int iovcnt,
546 NetPacketSent *sent_cb)
547 {
548 ssize_t ret = 0;
549 NetFilterState *nf = NULL;
550
551 if (direction == NET_FILTER_DIRECTION_TX) {
552 QTAILQ_FOREACH(nf, &nc->filters, next) {
553 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov,
554 iovcnt, sent_cb);
555 if (ret) {
556 return ret;
557 }
558 }
559 } else {
560 QTAILQ_FOREACH_REVERSE(nf, &nc->filters, next) {
561 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov,
562 iovcnt, sent_cb);
563 if (ret) {
564 return ret;
565 }
566 }
567 }
568
569 return ret;
570 }
571
572 static ssize_t filter_receive(NetClientState *nc,
573 NetFilterDirection direction,
574 NetClientState *sender,
575 unsigned flags,
576 const uint8_t *data,
577 size_t size,
578 NetPacketSent *sent_cb)
579 {
580 struct iovec iov = {
581 .iov_base = (void *)data,
582 .iov_len = size
583 };
584
585 return filter_receive_iov(nc, direction, sender, flags, &iov, 1, sent_cb);
586 }
587
588 void qemu_purge_queued_packets(NetClientState *nc)
589 {
590 if (!nc->peer) {
591 return;
592 }
593
594 qemu_net_queue_purge(nc->peer->incoming_queue, nc);
595 }
596
597 void qemu_flush_or_purge_queued_packets(NetClientState *nc, bool purge)
598 {
599 nc->receive_disabled = 0;
600
601 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_HUBPORT) {
602 if (net_hub_flush(nc->peer)) {
603 qemu_notify_event();
604 }
605 }
606 if (qemu_net_queue_flush(nc->incoming_queue)) {
607 /* We emptied the queue successfully, signal to the IO thread to repoll
608 * the file descriptor (for tap, for example).
609 */
610 qemu_notify_event();
611 } else if (purge) {
612 /* Unable to empty the queue, purge remaining packets */
613 qemu_net_queue_purge(nc->incoming_queue, nc);
614 }
615 }
616
617 void qemu_flush_queued_packets(NetClientState *nc)
618 {
619 qemu_flush_or_purge_queued_packets(nc, false);
620 }
621
622 static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender,
623 unsigned flags,
624 const uint8_t *buf, int size,
625 NetPacketSent *sent_cb)
626 {
627 NetQueue *queue;
628 int ret;
629
630 #ifdef DEBUG_NET
631 printf("qemu_send_packet_async:\n");
632 qemu_hexdump((const char *)buf, stdout, "net", size);
633 #endif
634
635 if (sender->link_down || !sender->peer) {
636 return size;
637 }
638
639 /* Let filters handle the packet first */
640 ret = filter_receive(sender, NET_FILTER_DIRECTION_TX,
641 sender, flags, buf, size, sent_cb);
642 if (ret) {
643 return ret;
644 }
645
646 ret = filter_receive(sender->peer, NET_FILTER_DIRECTION_RX,
647 sender, flags, buf, size, sent_cb);
648 if (ret) {
649 return ret;
650 }
651
652 queue = sender->peer->incoming_queue;
653
654 return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb);
655 }
656
657 ssize_t qemu_send_packet_async(NetClientState *sender,
658 const uint8_t *buf, int size,
659 NetPacketSent *sent_cb)
660 {
661 return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE,
662 buf, size, sent_cb);
663 }
664
665 ssize_t qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size)
666 {
667 return qemu_send_packet_async(nc, buf, size, NULL);
668 }
669
670 ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size)
671 {
672 return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW,
673 buf, size, NULL);
674 }
675
676 static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov,
677 int iovcnt, unsigned flags)
678 {
679 uint8_t *buf = NULL;
680 uint8_t *buffer;
681 size_t offset;
682 ssize_t ret;
683
684 if (iovcnt == 1) {
685 buffer = iov[0].iov_base;
686 offset = iov[0].iov_len;
687 } else {
688 offset = iov_size(iov, iovcnt);
689 if (offset > NET_BUFSIZE) {
690 return -1;
691 }
692 buf = g_malloc(offset);
693 buffer = buf;
694 offset = iov_to_buf(iov, iovcnt, 0, buf, offset);
695 }
696
697 if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) {
698 ret = nc->info->receive_raw(nc, buffer, offset);
699 } else {
700 ret = nc->info->receive(nc, buffer, offset);
701 }
702
703 g_free(buf);
704 return ret;
705 }
706
707 static ssize_t qemu_deliver_packet_iov(NetClientState *sender,
708 unsigned flags,
709 const struct iovec *iov,
710 int iovcnt,
711 void *opaque)
712 {
713 NetClientState *nc = opaque;
714 int ret;
715
716
717 if (nc->link_down) {
718 return iov_size(iov, iovcnt);
719 }
720
721 if (nc->receive_disabled) {
722 return 0;
723 }
724
725 if (nc->info->receive_iov && !(flags & QEMU_NET_PACKET_FLAG_RAW)) {
726 ret = nc->info->receive_iov(nc, iov, iovcnt);
727 } else {
728 ret = nc_sendv_compat(nc, iov, iovcnt, flags);
729 }
730
731 if (ret == 0) {
732 nc->receive_disabled = 1;
733 }
734
735 return ret;
736 }
737
738 ssize_t qemu_sendv_packet_async(NetClientState *sender,
739 const struct iovec *iov, int iovcnt,
740 NetPacketSent *sent_cb)
741 {
742 NetQueue *queue;
743 size_t size = iov_size(iov, iovcnt);
744 int ret;
745
746 if (size > NET_BUFSIZE) {
747 return size;
748 }
749
750 if (sender->link_down || !sender->peer) {
751 return size;
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 printf("Supported NIC models:\n");
835 for (i = 0 ; models[i]; i++) {
836 printf("%s\n", models[i]);
837 }
838 return 1;
839 }
840
841 void qemu_check_nic_model(NICInfo *nd, const char *model)
842 {
843 const char *models[2];
844
845 models[0] = model;
846 models[1] = NULL;
847
848 if (qemu_show_nic_models(nd->model, models))
849 exit(0);
850 if (qemu_find_nic_model(nd, models, model) < 0)
851 exit(1);
852 }
853
854 int qemu_find_nic_model(NICInfo *nd, const char * const *models,
855 const char *default_model)
856 {
857 int i;
858
859 if (!nd->model)
860 nd->model = g_strdup(default_model);
861
862 for (i = 0 ; models[i]; i++) {
863 if (strcmp(nd->model, models[i]) == 0)
864 return i;
865 }
866
867 error_report("Unsupported NIC model: %s", nd->model);
868 return -1;
869 }
870
871 static int net_init_nic(const Netdev *netdev, const char *name,
872 NetClientState *peer, Error **errp)
873 {
874 int idx;
875 NICInfo *nd;
876 const NetLegacyNicOptions *nic;
877
878 assert(netdev->type == NET_CLIENT_DRIVER_NIC);
879 nic = &netdev->u.nic;
880
881 idx = nic_get_free_idx();
882 if (idx == -1 || nb_nics >= MAX_NICS) {
883 error_setg(errp, "too many NICs");
884 return -1;
885 }
886
887 nd = &nd_table[idx];
888
889 memset(nd, 0, sizeof(*nd));
890
891 if (nic->has_netdev) {
892 nd->netdev = qemu_find_netdev(nic->netdev);
893 if (!nd->netdev) {
894 error_setg(errp, "netdev '%s' not found", nic->netdev);
895 return -1;
896 }
897 } else {
898 assert(peer);
899 nd->netdev = peer;
900 }
901 nd->name = g_strdup(name);
902 if (nic->has_model) {
903 nd->model = g_strdup(nic->model);
904 }
905 if (nic->has_addr) {
906 nd->devaddr = g_strdup(nic->addr);
907 }
908
909 if (nic->has_macaddr &&
910 net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) {
911 error_setg(errp, "invalid syntax for ethernet address");
912 return -1;
913 }
914 if (nic->has_macaddr &&
915 is_multicast_ether_addr(nd->macaddr.a)) {
916 error_setg(errp,
917 "NIC cannot have multicast MAC address (odd 1st byte)");
918 return -1;
919 }
920 qemu_macaddr_default_if_unset(&nd->macaddr);
921
922 if (nic->has_vectors) {
923 if (nic->vectors > 0x7ffffff) {
924 error_setg(errp, "invalid # of vectors: %"PRIu32, nic->vectors);
925 return -1;
926 }
927 nd->nvectors = nic->vectors;
928 } else {
929 nd->nvectors = DEV_NVECTORS_UNSPECIFIED;
930 }
931
932 nd->used = 1;
933 nb_nics++;
934
935 return idx;
936 }
937
938
939 static int (* const net_client_init_fun[NET_CLIENT_DRIVER__MAX])(
940 const Netdev *netdev,
941 const char *name,
942 NetClientState *peer, Error **errp) = {
943 [NET_CLIENT_DRIVER_NIC] = net_init_nic,
944 #ifdef CONFIG_SLIRP
945 [NET_CLIENT_DRIVER_USER] = net_init_slirp,
946 #endif
947 [NET_CLIENT_DRIVER_TAP] = net_init_tap,
948 [NET_CLIENT_DRIVER_SOCKET] = net_init_socket,
949 #ifdef CONFIG_VDE
950 [NET_CLIENT_DRIVER_VDE] = net_init_vde,
951 #endif
952 #ifdef CONFIG_NETMAP
953 [NET_CLIENT_DRIVER_NETMAP] = net_init_netmap,
954 #endif
955 #ifdef CONFIG_NET_BRIDGE
956 [NET_CLIENT_DRIVER_BRIDGE] = net_init_bridge,
957 #endif
958 [NET_CLIENT_DRIVER_HUBPORT] = net_init_hubport,
959 #ifdef CONFIG_VHOST_NET_USER
960 [NET_CLIENT_DRIVER_VHOST_USER] = net_init_vhost_user,
961 #endif
962 #ifdef CONFIG_L2TPV3
963 [NET_CLIENT_DRIVER_L2TPV3] = net_init_l2tpv3,
964 #endif
965 };
966
967
968 static int net_client_init1(const void *object, bool is_netdev, Error **errp)
969 {
970 Netdev legacy = {0};
971 const Netdev *netdev;
972 const char *name;
973 NetClientState *peer = NULL;
974
975 if (is_netdev) {
976 netdev = object;
977 name = netdev->id;
978
979 if (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 if (net->has_name) {
994 warn_report("The 'name' parameter is deprecated, use 'id' instead");
995 }
996
997 /* Map the old options to the new flat type */
998 switch (opts->type) {
999 case NET_LEGACY_OPTIONS_TYPE_NONE:
1000 return 0; /* nothing to do */
1001 case NET_LEGACY_OPTIONS_TYPE_NIC:
1002 legacy.type = NET_CLIENT_DRIVER_NIC;
1003 legacy.u.nic = opts->u.nic;
1004 break;
1005 case NET_LEGACY_OPTIONS_TYPE_USER:
1006 legacy.type = NET_CLIENT_DRIVER_USER;
1007 legacy.u.user = opts->u.user;
1008 break;
1009 case NET_LEGACY_OPTIONS_TYPE_TAP:
1010 legacy.type = NET_CLIENT_DRIVER_TAP;
1011 legacy.u.tap = opts->u.tap;
1012 break;
1013 case NET_LEGACY_OPTIONS_TYPE_L2TPV3:
1014 legacy.type = NET_CLIENT_DRIVER_L2TPV3;
1015 legacy.u.l2tpv3 = opts->u.l2tpv3;
1016 break;
1017 case NET_LEGACY_OPTIONS_TYPE_SOCKET:
1018 legacy.type = NET_CLIENT_DRIVER_SOCKET;
1019 legacy.u.socket = opts->u.socket;
1020 break;
1021 case NET_LEGACY_OPTIONS_TYPE_VDE:
1022 legacy.type = NET_CLIENT_DRIVER_VDE;
1023 legacy.u.vde = opts->u.vde;
1024 break;
1025 case NET_LEGACY_OPTIONS_TYPE_BRIDGE:
1026 legacy.type = NET_CLIENT_DRIVER_BRIDGE;
1027 legacy.u.bridge = opts->u.bridge;
1028 break;
1029 case NET_LEGACY_OPTIONS_TYPE_NETMAP:
1030 legacy.type = NET_CLIENT_DRIVER_NETMAP;
1031 legacy.u.netmap = opts->u.netmap;
1032 break;
1033 case NET_LEGACY_OPTIONS_TYPE_VHOST_USER:
1034 legacy.type = NET_CLIENT_DRIVER_VHOST_USER;
1035 legacy.u.vhost_user = opts->u.vhost_user;
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 hub if it's a nic with a netdev= parameter. */
1049 if (netdev->type != NET_CLIENT_DRIVER_NIC ||
1050 !opts->u.nic.has_netdev) {
1051 peer = net_hub_add_port(0, NULL, 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_str(netdev->type));
1060 }
1061 return -1;
1062 }
1063 return 0;
1064 }
1065
1066 static void show_netdevs(void)
1067 {
1068 int idx;
1069 const char *available_netdevs[] = {
1070 "socket",
1071 "hubport",
1072 "tap",
1073 #ifdef CONFIG_SLIRP
1074 "user",
1075 #endif
1076 #ifdef CONFIG_L2TPV3
1077 "l2tpv3",
1078 #endif
1079 #ifdef CONFIG_VDE
1080 "vde",
1081 #endif
1082 #ifdef CONFIG_NET_BRIDGE
1083 "bridge",
1084 #endif
1085 #ifdef CONFIG_NETMAP
1086 "netmap",
1087 #endif
1088 #ifdef CONFIG_POSIX
1089 "vhost-user",
1090 #endif
1091 };
1092
1093 printf("Available netdev backend types:\n");
1094 for (idx = 0; idx < ARRAY_SIZE(available_netdevs); idx++) {
1095 puts(available_netdevs[idx]);
1096 }
1097 }
1098
1099 static int net_client_init(QemuOpts *opts, bool is_netdev, Error **errp)
1100 {
1101 gchar **substrings = NULL;
1102 void *object = NULL;
1103 Error *err = NULL;
1104 int ret = -1;
1105 Visitor *v = opts_visitor_new(opts);
1106
1107 const char *type = qemu_opt_get(opts, "type");
1108
1109 if (is_netdev && type && is_help_option(type)) {
1110 show_netdevs();
1111 exit(0);
1112 } else {
1113 /* Parse convenience option format ip6-net=fec0::0[/64] */
1114 const char *ip6_net = qemu_opt_get(opts, "ipv6-net");
1115
1116 if (ip6_net) {
1117 char *prefix_addr;
1118 unsigned long prefix_len = 64; /* Default 64bit prefix length. */
1119
1120 substrings = g_strsplit(ip6_net, "/", 2);
1121 if (!substrings || !substrings[0]) {
1122 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "ipv6-net",
1123 "a valid IPv6 prefix");
1124 goto out;
1125 }
1126
1127 prefix_addr = substrings[0];
1128
1129 /* Handle user-specified prefix length. */
1130 if (substrings[1] &&
1131 qemu_strtoul(substrings[1], NULL, 10, &prefix_len))
1132 {
1133 error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1134 "ipv6-prefixlen", "a number");
1135 goto out;
1136 }
1137
1138 qemu_opt_set(opts, "ipv6-prefix", prefix_addr, &error_abort);
1139 qemu_opt_set_number(opts, "ipv6-prefixlen", prefix_len,
1140 &error_abort);
1141 qemu_opt_unset(opts, "ipv6-net");
1142 }
1143 }
1144
1145 if (is_netdev) {
1146 visit_type_Netdev(v, NULL, (Netdev **)&object, &err);
1147 } else {
1148 visit_type_NetLegacy(v, NULL, (NetLegacy **)&object, &err);
1149 }
1150
1151 if (!err) {
1152 ret = net_client_init1(object, is_netdev, &err);
1153 }
1154
1155 if (is_netdev) {
1156 qapi_free_Netdev(object);
1157 } else {
1158 qapi_free_NetLegacy(object);
1159 }
1160
1161 out:
1162 error_propagate(errp, err);
1163 g_strfreev(substrings);
1164 visit_free(v);
1165 return ret;
1166 }
1167
1168 void netdev_add(QemuOpts *opts, Error **errp)
1169 {
1170 net_client_init(opts, true, errp);
1171 }
1172
1173 void qmp_netdev_add(QDict *qdict, QObject **ret, Error **errp)
1174 {
1175 Error *local_err = NULL;
1176 QemuOptsList *opts_list;
1177 QemuOpts *opts;
1178
1179 opts_list = qemu_find_opts_err("netdev", &local_err);
1180 if (local_err) {
1181 goto out;
1182 }
1183
1184 opts = qemu_opts_from_qdict(opts_list, qdict, &local_err);
1185 if (local_err) {
1186 goto out;
1187 }
1188
1189 netdev_add(opts, &local_err);
1190 if (local_err) {
1191 qemu_opts_del(opts);
1192 goto out;
1193 }
1194
1195 out:
1196 error_propagate(errp, local_err);
1197 }
1198
1199 void qmp_netdev_del(const char *id, Error **errp)
1200 {
1201 NetClientState *nc;
1202 QemuOpts *opts;
1203
1204 nc = qemu_find_netdev(id);
1205 if (!nc) {
1206 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1207 "Device '%s' not found", id);
1208 return;
1209 }
1210
1211 opts = qemu_opts_find(qemu_find_opts_err("netdev", NULL), id);
1212 if (!opts) {
1213 error_setg(errp, "Device '%s' is not a netdev", id);
1214 return;
1215 }
1216
1217 qemu_del_net_client(nc);
1218 qemu_opts_del(opts);
1219 }
1220
1221 static void netfilter_print_info(Monitor *mon, NetFilterState *nf)
1222 {
1223 char *str;
1224 ObjectProperty *prop;
1225 ObjectPropertyIterator iter;
1226 Visitor *v;
1227
1228 /* generate info str */
1229 object_property_iter_init(&iter, OBJECT(nf));
1230 while ((prop = object_property_iter_next(&iter))) {
1231 if (!strcmp(prop->name, "type")) {
1232 continue;
1233 }
1234 v = string_output_visitor_new(false, &str);
1235 object_property_get(OBJECT(nf), v, prop->name, NULL);
1236 visit_complete(v, &str);
1237 visit_free(v);
1238 monitor_printf(mon, ",%s=%s", prop->name, str);
1239 g_free(str);
1240 }
1241 monitor_printf(mon, "\n");
1242 }
1243
1244 void print_net_client(Monitor *mon, NetClientState *nc)
1245 {
1246 NetFilterState *nf;
1247
1248 monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name,
1249 nc->queue_index,
1250 NetClientDriver_str(nc->info->type),
1251 nc->info_str);
1252 if (!QTAILQ_EMPTY(&nc->filters)) {
1253 monitor_printf(mon, "filters:\n");
1254 }
1255 QTAILQ_FOREACH(nf, &nc->filters, next) {
1256 char *path = object_get_canonical_path_component(OBJECT(nf));
1257
1258 monitor_printf(mon, " - %s: type=%s", path,
1259 object_get_typename(OBJECT(nf)));
1260 netfilter_print_info(mon, nf);
1261 g_free(path);
1262 }
1263 }
1264
1265 RxFilterInfoList *qmp_query_rx_filter(bool has_name, const char *name,
1266 Error **errp)
1267 {
1268 NetClientState *nc;
1269 RxFilterInfoList *filter_list = NULL, *last_entry = NULL;
1270
1271 QTAILQ_FOREACH(nc, &net_clients, next) {
1272 RxFilterInfoList *entry;
1273 RxFilterInfo *info;
1274
1275 if (has_name && strcmp(nc->name, name) != 0) {
1276 continue;
1277 }
1278
1279 /* only query rx-filter information of NIC */
1280 if (nc->info->type != NET_CLIENT_DRIVER_NIC) {
1281 if (has_name) {
1282 error_setg(errp, "net client(%s) isn't a NIC", name);
1283 return NULL;
1284 }
1285 continue;
1286 }
1287
1288 /* only query information on queue 0 since the info is per nic,
1289 * not per queue
1290 */
1291 if (nc->queue_index != 0)
1292 continue;
1293
1294 if (nc->info->query_rx_filter) {
1295 info = nc->info->query_rx_filter(nc);
1296 entry = g_malloc0(sizeof(*entry));
1297 entry->value = info;
1298
1299 if (!filter_list) {
1300 filter_list = entry;
1301 } else {
1302 last_entry->next = entry;
1303 }
1304 last_entry = entry;
1305 } else if (has_name) {
1306 error_setg(errp, "net client(%s) doesn't support"
1307 " rx-filter querying", name);
1308 return NULL;
1309 }
1310
1311 if (has_name) {
1312 break;
1313 }
1314 }
1315
1316 if (filter_list == NULL && has_name) {
1317 error_setg(errp, "invalid net client name: %s", name);
1318 }
1319
1320 return filter_list;
1321 }
1322
1323 void hmp_info_network(Monitor *mon, const QDict *qdict)
1324 {
1325 NetClientState *nc, *peer;
1326 NetClientDriver type;
1327
1328 net_hub_info(mon);
1329
1330 QTAILQ_FOREACH(nc, &net_clients, next) {
1331 peer = nc->peer;
1332 type = nc->info->type;
1333
1334 /* Skip if already printed in hub info */
1335 if (net_hub_id_for_client(nc, NULL) == 0) {
1336 continue;
1337 }
1338
1339 if (!peer || type == NET_CLIENT_DRIVER_NIC) {
1340 print_net_client(mon, nc);
1341 } /* else it's a netdev connected to a NIC, printed with the NIC */
1342 if (peer && type == NET_CLIENT_DRIVER_NIC) {
1343 monitor_printf(mon, " \\ ");
1344 print_net_client(mon, peer);
1345 }
1346 }
1347 }
1348
1349 void colo_notify_filters_event(int event, Error **errp)
1350 {
1351 NetClientState *nc;
1352 NetFilterState *nf;
1353 NetFilterClass *nfc = NULL;
1354 Error *local_err = NULL;
1355
1356 QTAILQ_FOREACH(nc, &net_clients, next) {
1357 QTAILQ_FOREACH(nf, &nc->filters, next) {
1358 nfc = NETFILTER_GET_CLASS(OBJECT(nf));
1359 nfc->handle_event(nf, event, &local_err);
1360 if (local_err) {
1361 error_propagate(errp, local_err);
1362 return;
1363 }
1364 }
1365 }
1366 }
1367
1368 void qmp_set_link(const char *name, bool up, Error **errp)
1369 {
1370 NetClientState *ncs[MAX_QUEUE_NUM];
1371 NetClientState *nc;
1372 int queues, i;
1373
1374 queues = qemu_find_net_clients_except(name, ncs,
1375 NET_CLIENT_DRIVER__MAX,
1376 MAX_QUEUE_NUM);
1377
1378 if (queues == 0) {
1379 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1380 "Device '%s' not found", name);
1381 return;
1382 }
1383 nc = ncs[0];
1384
1385 for (i = 0; i < queues; i++) {
1386 ncs[i]->link_down = !up;
1387 }
1388
1389 if (nc->info->link_status_changed) {
1390 nc->info->link_status_changed(nc);
1391 }
1392
1393 if (nc->peer) {
1394 /* Change peer link only if the peer is NIC and then notify peer.
1395 * If the peer is a HUBPORT or a backend, we do not change the
1396 * link status.
1397 *
1398 * This behavior is compatible with qemu hubs where there could be
1399 * multiple clients that can still communicate with each other in
1400 * disconnected mode. For now maintain this compatibility.
1401 */
1402 if (nc->peer->info->type == NET_CLIENT_DRIVER_NIC) {
1403 for (i = 0; i < queues; i++) {
1404 ncs[i]->peer->link_down = !up;
1405 }
1406 }
1407 if (nc->peer->info->link_status_changed) {
1408 nc->peer->info->link_status_changed(nc->peer);
1409 }
1410 }
1411 }
1412
1413 static void net_vm_change_state_handler(void *opaque, int running,
1414 RunState state)
1415 {
1416 NetClientState *nc;
1417 NetClientState *tmp;
1418
1419 QTAILQ_FOREACH_SAFE(nc, &net_clients, next, tmp) {
1420 if (running) {
1421 /* Flush queued packets and wake up backends. */
1422 if (nc->peer && qemu_can_send_packet(nc)) {
1423 qemu_flush_queued_packets(nc->peer);
1424 }
1425 } else {
1426 /* Complete all queued packets, to guarantee we don't modify
1427 * state later when VM is not running.
1428 */
1429 qemu_flush_or_purge_queued_packets(nc, true);
1430 }
1431 }
1432 }
1433
1434 void net_cleanup(void)
1435 {
1436 NetClientState *nc;
1437
1438 /* We may del multiple entries during qemu_del_net_client(),
1439 * so QTAILQ_FOREACH_SAFE() is also not safe here.
1440 */
1441 while (!QTAILQ_EMPTY(&net_clients)) {
1442 nc = QTAILQ_FIRST(&net_clients);
1443 if (nc->info->type == NET_CLIENT_DRIVER_NIC) {
1444 qemu_del_nic(qemu_get_nic(nc));
1445 } else {
1446 qemu_del_net_client(nc);
1447 }
1448 }
1449
1450 qemu_del_vm_change_state_handler(net_change_state_entry);
1451 }
1452
1453 void net_check_clients(void)
1454 {
1455 NetClientState *nc;
1456 int i;
1457
1458 net_hub_check_clients();
1459
1460 QTAILQ_FOREACH(nc, &net_clients, next) {
1461 if (!nc->peer) {
1462 warn_report("%s %s has no peer",
1463 nc->info->type == NET_CLIENT_DRIVER_NIC
1464 ? "nic" : "netdev",
1465 nc->name);
1466 }
1467 }
1468
1469 /* Check that all NICs requested via -net nic actually got created.
1470 * NICs created via -device don't need to be checked here because
1471 * they are always instantiated.
1472 */
1473 for (i = 0; i < MAX_NICS; i++) {
1474 NICInfo *nd = &nd_table[i];
1475 if (nd->used && !nd->instantiated) {
1476 warn_report("requested NIC (%s, model %s) "
1477 "was not created (not supported by this machine?)",
1478 nd->name ? nd->name : "anonymous",
1479 nd->model ? nd->model : "unspecified");
1480 }
1481 }
1482 }
1483
1484 static int net_init_client(void *dummy, QemuOpts *opts, Error **errp)
1485 {
1486 return net_client_init(opts, false, errp);
1487 }
1488
1489 static int net_init_netdev(void *dummy, QemuOpts *opts, Error **errp)
1490 {
1491 return net_client_init(opts, true, errp);
1492 }
1493
1494 /* For the convenience "--nic" parameter */
1495 static int net_param_nic(void *dummy, QemuOpts *opts, Error **errp)
1496 {
1497 char *mac, *nd_id;
1498 int idx, ret;
1499 NICInfo *ni;
1500 const char *type;
1501
1502 type = qemu_opt_get(opts, "type");
1503 if (type && g_str_equal(type, "none")) {
1504 return 0; /* Nothing to do, default_net is cleared in vl.c */
1505 }
1506
1507 idx = nic_get_free_idx();
1508 if (idx == -1 || nb_nics >= MAX_NICS) {
1509 error_setg(errp, "no more on-board/default NIC slots available");
1510 return -1;
1511 }
1512
1513 if (!type) {
1514 qemu_opt_set(opts, "type", "user", &error_abort);
1515 }
1516
1517 ni = &nd_table[idx];
1518 memset(ni, 0, sizeof(*ni));
1519 ni->model = qemu_opt_get_del(opts, "model");
1520
1521 /* Create an ID if the user did not specify one */
1522 nd_id = g_strdup(qemu_opts_id(opts));
1523 if (!nd_id) {
1524 nd_id = g_strdup_printf("__org.qemu.nic%i\n", idx);
1525 qemu_opts_set_id(opts, nd_id);
1526 }
1527
1528 /* Handle MAC address */
1529 mac = qemu_opt_get_del(opts, "mac");
1530 if (mac) {
1531 ret = net_parse_macaddr(ni->macaddr.a, mac);
1532 g_free(mac);
1533 if (ret) {
1534 error_setg(errp, "invalid syntax for ethernet address");
1535 goto out;
1536 }
1537 if (is_multicast_ether_addr(ni->macaddr.a)) {
1538 error_setg(errp, "NIC cannot have multicast MAC address");
1539 ret = -1;
1540 goto out;
1541 }
1542 }
1543 qemu_macaddr_default_if_unset(&ni->macaddr);
1544
1545 ret = net_client_init(opts, true, errp);
1546 if (ret == 0) {
1547 ni->netdev = qemu_find_netdev(nd_id);
1548 ni->used = true;
1549 nb_nics++;
1550 }
1551
1552 out:
1553 g_free(nd_id);
1554 return ret;
1555 }
1556
1557 int net_init_clients(Error **errp)
1558 {
1559 net_change_state_entry =
1560 qemu_add_vm_change_state_handler(net_vm_change_state_handler, NULL);
1561
1562 QTAILQ_INIT(&net_clients);
1563
1564 if (qemu_opts_foreach(qemu_find_opts("netdev"),
1565 net_init_netdev, NULL, errp)) {
1566 return -1;
1567 }
1568
1569 if (qemu_opts_foreach(qemu_find_opts("nic"), net_param_nic, NULL, errp)) {
1570 return -1;
1571 }
1572
1573 if (qemu_opts_foreach(qemu_find_opts("net"), net_init_client, NULL, errp)) {
1574 return -1;
1575 }
1576
1577 return 0;
1578 }
1579
1580 int net_client_parse(QemuOptsList *opts_list, const char *optarg)
1581 {
1582 if (!qemu_opts_parse_noisily(opts_list, optarg, true)) {
1583 return -1;
1584 }
1585
1586 return 0;
1587 }
1588
1589 /* From FreeBSD */
1590 /* XXX: optimize */
1591 uint32_t net_crc32(const uint8_t *p, int len)
1592 {
1593 uint32_t crc;
1594 int carry, i, j;
1595 uint8_t b;
1596
1597 crc = 0xffffffff;
1598 for (i = 0; i < len; i++) {
1599 b = *p++;
1600 for (j = 0; j < 8; j++) {
1601 carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01);
1602 crc <<= 1;
1603 b >>= 1;
1604 if (carry) {
1605 crc = ((crc ^ POLYNOMIAL_BE) | carry);
1606 }
1607 }
1608 }
1609
1610 return crc;
1611 }
1612
1613 uint32_t net_crc32_le(const uint8_t *p, int len)
1614 {
1615 uint32_t crc;
1616 int carry, i, j;
1617 uint8_t b;
1618
1619 crc = 0xffffffff;
1620 for (i = 0; i < len; i++) {
1621 b = *p++;
1622 for (j = 0; j < 8; j++) {
1623 carry = (crc & 0x1) ^ (b & 0x01);
1624 crc >>= 1;
1625 b >>= 1;
1626 if (carry) {
1627 crc ^= POLYNOMIAL_LE;
1628 }
1629 }
1630 }
1631
1632 return crc;
1633 }
1634
1635 QemuOptsList qemu_netdev_opts = {
1636 .name = "netdev",
1637 .implied_opt_name = "type",
1638 .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head),
1639 .desc = {
1640 /*
1641 * no elements => accept any params
1642 * validation will happen later
1643 */
1644 { /* end of list */ }
1645 },
1646 };
1647
1648 QemuOptsList qemu_nic_opts = {
1649 .name = "nic",
1650 .implied_opt_name = "type",
1651 .head = QTAILQ_HEAD_INITIALIZER(qemu_nic_opts.head),
1652 .desc = {
1653 /*
1654 * no elements => accept any params
1655 * validation will happen later
1656 */
1657 { /* end of list */ }
1658 },
1659 };
1660
1661 QemuOptsList qemu_net_opts = {
1662 .name = "net",
1663 .implied_opt_name = "type",
1664 .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head),
1665 .desc = {
1666 /*
1667 * no elements => accept any params
1668 * validation will happen later
1669 */
1670 { /* end of list */ }
1671 },
1672 };
1673
1674 void net_socket_rs_init(SocketReadState *rs,
1675 SocketReadStateFinalize *finalize,
1676 bool vnet_hdr)
1677 {
1678 rs->state = 0;
1679 rs->vnet_hdr = vnet_hdr;
1680 rs->index = 0;
1681 rs->packet_len = 0;
1682 rs->vnet_hdr_len = 0;
1683 memset(rs->buf, 0, sizeof(rs->buf));
1684 rs->finalize = finalize;
1685 }
1686
1687 /*
1688 * Returns
1689 * 0: success
1690 * -1: error occurs
1691 */
1692 int net_fill_rstate(SocketReadState *rs, const uint8_t *buf, int size)
1693 {
1694 unsigned int l;
1695
1696 while (size > 0) {
1697 /* Reassemble a packet from the network.
1698 * 0 = getting length.
1699 * 1 = getting vnet header length.
1700 * 2 = getting data.
1701 */
1702 switch (rs->state) {
1703 case 0:
1704 l = 4 - rs->index;
1705 if (l > size) {
1706 l = size;
1707 }
1708 memcpy(rs->buf + rs->index, buf, l);
1709 buf += l;
1710 size -= l;
1711 rs->index += l;
1712 if (rs->index == 4) {
1713 /* got length */
1714 rs->packet_len = ntohl(*(uint32_t *)rs->buf);
1715 rs->index = 0;
1716 if (rs->vnet_hdr) {
1717 rs->state = 1;
1718 } else {
1719 rs->state = 2;
1720 rs->vnet_hdr_len = 0;
1721 }
1722 }
1723 break;
1724 case 1:
1725 l = 4 - rs->index;
1726 if (l > size) {
1727 l = size;
1728 }
1729 memcpy(rs->buf + rs->index, buf, l);
1730 buf += l;
1731 size -= l;
1732 rs->index += l;
1733 if (rs->index == 4) {
1734 /* got vnet header length */
1735 rs->vnet_hdr_len = ntohl(*(uint32_t *)rs->buf);
1736 rs->index = 0;
1737 rs->state = 2;
1738 }
1739 break;
1740 case 2:
1741 l = rs->packet_len - rs->index;
1742 if (l > size) {
1743 l = size;
1744 }
1745 if (rs->index + l <= sizeof(rs->buf)) {
1746 memcpy(rs->buf + rs->index, buf, l);
1747 } else {
1748 fprintf(stderr, "serious error: oversized packet received,"
1749 "connection terminated.\n");
1750 rs->index = rs->state = 0;
1751 return -1;
1752 }
1753
1754 rs->index += l;
1755 buf += l;
1756 size -= l;
1757 if (rs->index >= rs->packet_len) {
1758 rs->index = 0;
1759 rs->state = 0;
1760 assert(rs->finalize);
1761 rs->finalize(rs);
1762 }
1763 break;
1764 }
1765 }
1766
1767 assert(size == 0);
1768 return 0;
1769 }