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25#include "qemu/osdep.h"
26#include "qemu-common.h"
27
28#include "net/net.h"
29#include "clients.h"
30#include "hub.h"
31#include "hw/qdev-properties.h"
32#include "net/slirp.h"
33#include "net/eth.h"
34#include "util.h"
35
36#include "monitor/monitor.h"
37#include "qemu/help_option.h"
38#include "qapi/qapi-commands-net.h"
39#include "qapi/qapi-visit-net.h"
40#include "qapi/qmp/qdict.h"
41#include "qapi/qmp/qerror.h"
42#include "qemu/error-report.h"
43#include "qemu/sockets.h"
44#include "qemu/cutils.h"
45#include "qemu/config-file.h"
46#include "qemu/ctype.h"
47#include "qemu/id.h"
48#include "qemu/iov.h"
49#include "qemu/qemu-print.h"
50#include "qemu/main-loop.h"
51#include "qemu/option.h"
52#include "qapi/error.h"
53#include "qapi/opts-visitor.h"
54#include "sysemu/runstate.h"
55#include "net/colo-compare.h"
56#include "net/filter.h"
57#include "qapi/string-output-visitor.h"
58
59
60#if !defined(_WIN32)
61# define CONFIG_NET_BRIDGE
62#endif
63
64static VMChangeStateEntry *net_change_state_entry;
65static QTAILQ_HEAD(, NetClientState) net_clients;
66
67
68
69
70int parse_host_port(struct sockaddr_in *saddr, const char *str,
71 Error **errp)
72{
73 gchar **substrings;
74 struct hostent *he;
75 const char *addr, *p, *r;
76 int port, ret = 0;
77
78 substrings = g_strsplit(str, ":", 2);
79 if (!substrings || !substrings[0] || !substrings[1]) {
80 error_setg(errp, "host address '%s' doesn't contain ':' "
81 "separating host from port", str);
82 ret = -1;
83 goto out;
84 }
85
86 addr = substrings[0];
87 p = substrings[1];
88
89 saddr->sin_family = AF_INET;
90 if (addr[0] == '\0') {
91 saddr->sin_addr.s_addr = 0;
92 } else {
93 if (qemu_isdigit(addr[0])) {
94 if (!inet_aton(addr, &saddr->sin_addr)) {
95 error_setg(errp, "host address '%s' is not a valid "
96 "IPv4 address", addr);
97 ret = -1;
98 goto out;
99 }
100 } else {
101 he = gethostbyname(addr);
102 if (he == NULL) {
103 error_setg(errp, "can't resolve host address '%s'", addr);
104 ret = -1;
105 goto out;
106 }
107 saddr->sin_addr = *(struct in_addr *)he->h_addr;
108 }
109 }
110 port = strtol(p, (char **)&r, 0);
111 if (r == p) {
112 error_setg(errp, "port number '%s' is invalid", p);
113 ret = -1;
114 goto out;
115 }
116 saddr->sin_port = htons(port);
117
118out:
119 g_strfreev(substrings);
120 return ret;
121}
122
123char *qemu_mac_strdup_printf(const uint8_t *macaddr)
124{
125 return g_strdup_printf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x",
126 macaddr[0], macaddr[1], macaddr[2],
127 macaddr[3], macaddr[4], macaddr[5]);
128}
129
130void qemu_format_nic_info_str(NetClientState *nc, uint8_t macaddr[6])
131{
132 snprintf(nc->info_str, sizeof(nc->info_str),
133 "model=%s,macaddr=%02x:%02x:%02x:%02x:%02x:%02x",
134 nc->model,
135 macaddr[0], macaddr[1], macaddr[2],
136 macaddr[3], macaddr[4], macaddr[5]);
137}
138
139static int mac_table[256] = {0};
140
141static void qemu_macaddr_set_used(MACAddr *macaddr)
142{
143 int index;
144
145 for (index = 0x56; index < 0xFF; index++) {
146 if (macaddr->a[5] == index) {
147 mac_table[index]++;
148 }
149 }
150}
151
152static void qemu_macaddr_set_free(MACAddr *macaddr)
153{
154 int index;
155 static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } };
156
157 if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) {
158 return;
159 }
160 for (index = 0x56; index < 0xFF; index++) {
161 if (macaddr->a[5] == index) {
162 mac_table[index]--;
163 }
164 }
165}
166
167static int qemu_macaddr_get_free(void)
168{
169 int index;
170
171 for (index = 0x56; index < 0xFF; index++) {
172 if (mac_table[index] == 0) {
173 return index;
174 }
175 }
176
177 return -1;
178}
179
180void qemu_macaddr_default_if_unset(MACAddr *macaddr)
181{
182 static const MACAddr zero = { .a = { 0,0,0,0,0,0 } };
183 static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } };
184
185 if (memcmp(macaddr, &zero, sizeof(zero)) != 0) {
186 if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) {
187 return;
188 } else {
189 qemu_macaddr_set_used(macaddr);
190 return;
191 }
192 }
193
194 macaddr->a[0] = 0x52;
195 macaddr->a[1] = 0x54;
196 macaddr->a[2] = 0x00;
197 macaddr->a[3] = 0x12;
198 macaddr->a[4] = 0x34;
199 macaddr->a[5] = qemu_macaddr_get_free();
200 qemu_macaddr_set_used(macaddr);
201}
202
203
204
205
206
207
208static char *assign_name(NetClientState *nc1, const char *model)
209{
210 NetClientState *nc;
211 int id = 0;
212
213 QTAILQ_FOREACH(nc, &net_clients, next) {
214 if (nc == nc1) {
215 continue;
216 }
217 if (strcmp(nc->model, model) == 0) {
218 id++;
219 }
220 }
221
222 return g_strdup_printf("%s.%d", model, id);
223}
224
225static void qemu_net_client_destructor(NetClientState *nc)
226{
227 g_free(nc);
228}
229static ssize_t qemu_deliver_packet_iov(NetClientState *sender,
230 unsigned flags,
231 const struct iovec *iov,
232 int iovcnt,
233 void *opaque);
234
235static 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
262NetClientState *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
278NICState *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
305NetClientState *qemu_get_subqueue(NICState *nic, int queue_index)
306{
307 return nic->ncs + queue_index;
308}
309
310NetClientState *qemu_get_queue(NICState *nic)
311{
312 return qemu_get_subqueue(nic, 0);
313}
314
315NICState *qemu_get_nic(NetClientState *nc)
316{
317 NetClientState *nc0 = nc - nc->queue_index;
318
319 return (NICState *)((void *)nc0 - nc->info->size);
320}
321
322void *qemu_get_nic_opaque(NetClientState *nc)
323{
324 NICState *nic = qemu_get_nic(nc);
325
326 return nic->opaque;
327}
328
329NetClientState *qemu_get_peer(NetClientState *nc, int queue_index)
330{
331 assert(nc != NULL);
332 NetClientState *ncs = nc + queue_index;
333 return ncs->peer;
334}
335
336static void qemu_cleanup_net_client(NetClientState *nc)
337{
338 QTAILQ_REMOVE(&net_clients, nc, next);
339
340 if (nc->info->cleanup) {
341 nc->info->cleanup(nc);
342 }
343}
344
345static void qemu_free_net_client(NetClientState *nc)
346{
347 if (nc->incoming_queue) {
348 qemu_del_net_queue(nc->incoming_queue);
349 }
350 if (nc->peer) {
351 nc->peer->peer = NULL;
352 }
353 g_free(nc->name);
354 g_free(nc->model);
355 if (nc->destructor) {
356 nc->destructor(nc);
357 }
358}
359
360void qemu_del_net_client(NetClientState *nc)
361{
362 NetClientState *ncs[MAX_QUEUE_NUM];
363 int queues, i;
364 NetFilterState *nf, *next;
365
366 assert(nc->info->type != NET_CLIENT_DRIVER_NIC);
367
368
369
370
371 queues = qemu_find_net_clients_except(nc->name, ncs,
372 NET_CLIENT_DRIVER_NIC,
373 MAX_QUEUE_NUM);
374 assert(queues != 0);
375
376 QTAILQ_FOREACH_SAFE(nf, &nc->filters, next, next) {
377 object_unparent(OBJECT(nf));
378 }
379
380
381 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_NIC) {
382 NICState *nic = qemu_get_nic(nc->peer);
383 if (nic->peer_deleted) {
384 return;
385 }
386 nic->peer_deleted = true;
387
388 for (i = 0; i < queues; i++) {
389 ncs[i]->peer->link_down = true;
390 }
391
392 if (nc->peer->info->link_status_changed) {
393 nc->peer->info->link_status_changed(nc->peer);
394 }
395
396 for (i = 0; i < queues; i++) {
397 qemu_cleanup_net_client(ncs[i]);
398 }
399
400 return;
401 }
402
403 for (i = 0; i < queues; i++) {
404 qemu_cleanup_net_client(ncs[i]);
405 qemu_free_net_client(ncs[i]);
406 }
407}
408
409void qemu_del_nic(NICState *nic)
410{
411 int i, queues = MAX(nic->conf->peers.queues, 1);
412
413 qemu_macaddr_set_free(&nic->conf->macaddr);
414
415 for (i = 0; i < queues; i++) {
416 NetClientState *nc = qemu_get_subqueue(nic, i);
417
418 if (nic->peer_deleted) {
419 qemu_free_net_client(nc->peer);
420 } else if (nc->peer) {
421
422 qemu_purge_queued_packets(nc->peer);
423 }
424 }
425
426 for (i = queues - 1; i >= 0; i--) {
427 NetClientState *nc = qemu_get_subqueue(nic, i);
428
429 qemu_cleanup_net_client(nc);
430 qemu_free_net_client(nc);
431 }
432
433 g_free(nic);
434}
435
436void qemu_foreach_nic(qemu_nic_foreach func, void *opaque)
437{
438 NetClientState *nc;
439
440 QTAILQ_FOREACH(nc, &net_clients, next) {
441 if (nc->info->type == NET_CLIENT_DRIVER_NIC) {
442 if (nc->queue_index == 0) {
443 func(qemu_get_nic(nc), opaque);
444 }
445 }
446 }
447}
448
449bool qemu_has_ufo(NetClientState *nc)
450{
451 if (!nc || !nc->info->has_ufo) {
452 return false;
453 }
454
455 return nc->info->has_ufo(nc);
456}
457
458bool qemu_has_vnet_hdr(NetClientState *nc)
459{
460 if (!nc || !nc->info->has_vnet_hdr) {
461 return false;
462 }
463
464 return nc->info->has_vnet_hdr(nc);
465}
466
467bool qemu_has_vnet_hdr_len(NetClientState *nc, int len)
468{
469 if (!nc || !nc->info->has_vnet_hdr_len) {
470 return false;
471 }
472
473 return nc->info->has_vnet_hdr_len(nc, len);
474}
475
476void qemu_using_vnet_hdr(NetClientState *nc, bool enable)
477{
478 if (!nc || !nc->info->using_vnet_hdr) {
479 return;
480 }
481
482 nc->info->using_vnet_hdr(nc, enable);
483}
484
485void qemu_set_offload(NetClientState *nc, int csum, int tso4, int tso6,
486 int ecn, int ufo)
487{
488 if (!nc || !nc->info->set_offload) {
489 return;
490 }
491
492 nc->info->set_offload(nc, csum, tso4, tso6, ecn, ufo);
493}
494
495void qemu_set_vnet_hdr_len(NetClientState *nc, int len)
496{
497 if (!nc || !nc->info->set_vnet_hdr_len) {
498 return;
499 }
500
501 nc->vnet_hdr_len = len;
502 nc->info->set_vnet_hdr_len(nc, len);
503}
504
505int qemu_set_vnet_le(NetClientState *nc, bool is_le)
506{
507#ifdef HOST_WORDS_BIGENDIAN
508 if (!nc || !nc->info->set_vnet_le) {
509 return -ENOSYS;
510 }
511
512 return nc->info->set_vnet_le(nc, is_le);
513#else
514 return 0;
515#endif
516}
517
518int qemu_set_vnet_be(NetClientState *nc, bool is_be)
519{
520#ifdef HOST_WORDS_BIGENDIAN
521 return 0;
522#else
523 if (!nc || !nc->info->set_vnet_be) {
524 return -ENOSYS;
525 }
526
527 return nc->info->set_vnet_be(nc, is_be);
528#endif
529}
530
531int qemu_can_receive_packet(NetClientState *nc)
532{
533 if (nc->receive_disabled) {
534 return 0;
535 } else if (nc->info->can_receive &&
536 !nc->info->can_receive(nc)) {
537 return 0;
538 }
539 return 1;
540}
541
542int qemu_can_send_packet(NetClientState *sender)
543{
544 int vm_running = runstate_is_running();
545
546 if (!vm_running) {
547 return 0;
548 }
549
550 if (!sender->peer) {
551 return 1;
552 }
553
554 return qemu_can_receive_packet(sender->peer);
555}
556
557static ssize_t filter_receive_iov(NetClientState *nc,
558 NetFilterDirection direction,
559 NetClientState *sender,
560 unsigned flags,
561 const struct iovec *iov,
562 int iovcnt,
563 NetPacketSent *sent_cb)
564{
565 ssize_t ret = 0;
566 NetFilterState *nf = NULL;
567
568 if (direction == NET_FILTER_DIRECTION_TX) {
569 QTAILQ_FOREACH(nf, &nc->filters, next) {
570 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov,
571 iovcnt, sent_cb);
572 if (ret) {
573 return ret;
574 }
575 }
576 } else {
577 QTAILQ_FOREACH_REVERSE(nf, &nc->filters, next) {
578 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov,
579 iovcnt, sent_cb);
580 if (ret) {
581 return ret;
582 }
583 }
584 }
585
586 return ret;
587}
588
589static ssize_t filter_receive(NetClientState *nc,
590 NetFilterDirection direction,
591 NetClientState *sender,
592 unsigned flags,
593 const uint8_t *data,
594 size_t size,
595 NetPacketSent *sent_cb)
596{
597 struct iovec iov = {
598 .iov_base = (void *)data,
599 .iov_len = size
600 };
601
602 return filter_receive_iov(nc, direction, sender, flags, &iov, 1, sent_cb);
603}
604
605void qemu_purge_queued_packets(NetClientState *nc)
606{
607 if (!nc->peer) {
608 return;
609 }
610
611 qemu_net_queue_purge(nc->peer->incoming_queue, nc);
612}
613
614void qemu_flush_or_purge_queued_packets(NetClientState *nc, bool purge)
615{
616 nc->receive_disabled = 0;
617
618 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_HUBPORT) {
619 if (net_hub_flush(nc->peer)) {
620 qemu_notify_event();
621 }
622 }
623 if (qemu_net_queue_flush(nc->incoming_queue)) {
624
625
626
627 qemu_notify_event();
628 } else if (purge) {
629
630 qemu_net_queue_purge(nc->incoming_queue, nc->peer);
631 }
632}
633
634void qemu_flush_queued_packets(NetClientState *nc)
635{
636 qemu_flush_or_purge_queued_packets(nc, false);
637}
638
639static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender,
640 unsigned flags,
641 const uint8_t *buf, int size,
642 NetPacketSent *sent_cb)
643{
644 NetQueue *queue;
645 int ret;
646
647#ifdef DEBUG_NET
648 printf("qemu_send_packet_async:\n");
649 qemu_hexdump(stdout, "net", buf, size);
650#endif
651
652 if (sender->link_down || !sender->peer) {
653 return size;
654 }
655
656
657 ret = filter_receive(sender, NET_FILTER_DIRECTION_TX,
658 sender, flags, buf, size, sent_cb);
659 if (ret) {
660 return ret;
661 }
662
663 ret = filter_receive(sender->peer, NET_FILTER_DIRECTION_RX,
664 sender, flags, buf, size, sent_cb);
665 if (ret) {
666 return ret;
667 }
668
669 queue = sender->peer->incoming_queue;
670
671 return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb);
672}
673
674ssize_t qemu_send_packet_async(NetClientState *sender,
675 const uint8_t *buf, int size,
676 NetPacketSent *sent_cb)
677{
678 return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE,
679 buf, size, sent_cb);
680}
681
682ssize_t qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size)
683{
684 return qemu_send_packet_async(nc, buf, size, NULL);
685}
686
687ssize_t qemu_receive_packet(NetClientState *nc, const uint8_t *buf, int size)
688{
689 if (!qemu_can_receive_packet(nc)) {
690 return 0;
691 }
692
693 return qemu_net_queue_receive(nc->incoming_queue, buf, size);
694}
695
696ssize_t qemu_receive_packet_iov(NetClientState *nc, const struct iovec *iov,
697 int iovcnt)
698{
699 if (!qemu_can_receive_packet(nc)) {
700 return 0;
701 }
702
703 return qemu_net_queue_receive_iov(nc->incoming_queue, iov, iovcnt);
704}
705
706ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size)
707{
708 return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW,
709 buf, size, NULL);
710}
711
712static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov,
713 int iovcnt, unsigned flags)
714{
715 uint8_t *buf = NULL;
716 uint8_t *buffer;
717 size_t offset;
718 ssize_t ret;
719
720 if (iovcnt == 1) {
721 buffer = iov[0].iov_base;
722 offset = iov[0].iov_len;
723 } else {
724 offset = iov_size(iov, iovcnt);
725 if (offset > NET_BUFSIZE) {
726 return -1;
727 }
728 buf = g_malloc(offset);
729 buffer = buf;
730 offset = iov_to_buf(iov, iovcnt, 0, buf, offset);
731 }
732
733 if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) {
734 ret = nc->info->receive_raw(nc, buffer, offset);
735 } else {
736 ret = nc->info->receive(nc, buffer, offset);
737 }
738
739 g_free(buf);
740 return ret;
741}
742
743static ssize_t qemu_deliver_packet_iov(NetClientState *sender,
744 unsigned flags,
745 const struct iovec *iov,
746 int iovcnt,
747 void *opaque)
748{
749 NetClientState *nc = opaque;
750 int ret;
751
752
753 if (nc->link_down) {
754 return iov_size(iov, iovcnt);
755 }
756
757 if (nc->receive_disabled) {
758 return 0;
759 }
760
761 if (nc->info->receive_iov && !(flags & QEMU_NET_PACKET_FLAG_RAW)) {
762 ret = nc->info->receive_iov(nc, iov, iovcnt);
763 } else {
764 ret = nc_sendv_compat(nc, iov, iovcnt, flags);
765 }
766
767 if (ret == 0) {
768 nc->receive_disabled = 1;
769 }
770
771 return ret;
772}
773
774ssize_t qemu_sendv_packet_async(NetClientState *sender,
775 const struct iovec *iov, int iovcnt,
776 NetPacketSent *sent_cb)
777{
778 NetQueue *queue;
779 size_t size = iov_size(iov, iovcnt);
780 int ret;
781
782 if (size > NET_BUFSIZE) {
783 return size;
784 }
785
786 if (sender->link_down || !sender->peer) {
787 return size;
788 }
789
790
791 ret = filter_receive_iov(sender, NET_FILTER_DIRECTION_TX, sender,
792 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb);
793 if (ret) {
794 return ret;
795 }
796
797 ret = filter_receive_iov(sender->peer, NET_FILTER_DIRECTION_RX, sender,
798 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb);
799 if (ret) {
800 return ret;
801 }
802
803 queue = sender->peer->incoming_queue;
804
805 return qemu_net_queue_send_iov(queue, sender,
806 QEMU_NET_PACKET_FLAG_NONE,
807 iov, iovcnt, sent_cb);
808}
809
810ssize_t
811qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt)
812{
813 return qemu_sendv_packet_async(nc, iov, iovcnt, NULL);
814}
815
816NetClientState *qemu_find_netdev(const char *id)
817{
818 NetClientState *nc;
819
820 QTAILQ_FOREACH(nc, &net_clients, next) {
821 if (nc->info->type == NET_CLIENT_DRIVER_NIC)
822 continue;
823 if (!strcmp(nc->name, id)) {
824 return nc;
825 }
826 }
827
828 return NULL;
829}
830
831int qemu_find_net_clients_except(const char *id, NetClientState **ncs,
832 NetClientDriver type, int max)
833{
834 NetClientState *nc;
835 int ret = 0;
836
837 QTAILQ_FOREACH(nc, &net_clients, next) {
838 if (nc->info->type == type) {
839 continue;
840 }
841 if (!id || !strcmp(nc->name, id)) {
842 if (ret < max) {
843 ncs[ret] = nc;
844 }
845 ret++;
846 }
847 }
848
849 return ret;
850}
851
852static int nic_get_free_idx(void)
853{
854 int index;
855
856 for (index = 0; index < MAX_NICS; index++)
857 if (!nd_table[index].used)
858 return index;
859 return -1;
860}
861
862int qemu_show_nic_models(const char *arg, const char *const *models)
863{
864 int i;
865
866 if (!arg || !is_help_option(arg)) {
867 return 0;
868 }
869
870 printf("Supported NIC models:\n");
871 for (i = 0 ; models[i]; i++) {
872 printf("%s\n", models[i]);
873 }
874 return 1;
875}
876
877void qemu_check_nic_model(NICInfo *nd, const char *model)
878{
879 const char *models[2];
880
881 models[0] = model;
882 models[1] = NULL;
883
884 if (qemu_show_nic_models(nd->model, models))
885 exit(0);
886 if (qemu_find_nic_model(nd, models, model) < 0)
887 exit(1);
888}
889
890int qemu_find_nic_model(NICInfo *nd, const char * const *models,
891 const char *default_model)
892{
893 int i;
894
895 if (!nd->model)
896 nd->model = g_strdup(default_model);
897
898 for (i = 0 ; models[i]; i++) {
899 if (strcmp(nd->model, models[i]) == 0)
900 return i;
901 }
902
903 error_report("Unsupported NIC model: %s", nd->model);
904 return -1;
905}
906
907static int net_init_nic(const Netdev *netdev, const char *name,
908 NetClientState *peer, Error **errp)
909{
910 int idx;
911 NICInfo *nd;
912 const NetLegacyNicOptions *nic;
913
914 assert(netdev->type == NET_CLIENT_DRIVER_NIC);
915 nic = &netdev->u.nic;
916
917 idx = nic_get_free_idx();
918 if (idx == -1 || nb_nics >= MAX_NICS) {
919 error_setg(errp, "too many NICs");
920 return -1;
921 }
922
923 nd = &nd_table[idx];
924
925 memset(nd, 0, sizeof(*nd));
926
927 if (nic->has_netdev) {
928 nd->netdev = qemu_find_netdev(nic->netdev);
929 if (!nd->netdev) {
930 error_setg(errp, "netdev '%s' not found", nic->netdev);
931 return -1;
932 }
933 } else {
934 assert(peer);
935 nd->netdev = peer;
936 }
937 nd->name = g_strdup(name);
938 if (nic->has_model) {
939 nd->model = g_strdup(nic->model);
940 }
941 if (nic->has_addr) {
942 nd->devaddr = g_strdup(nic->addr);
943 }
944
945 if (nic->has_macaddr &&
946 net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) {
947 error_setg(errp, "invalid syntax for ethernet address");
948 return -1;
949 }
950 if (nic->has_macaddr &&
951 is_multicast_ether_addr(nd->macaddr.a)) {
952 error_setg(errp,
953 "NIC cannot have multicast MAC address (odd 1st byte)");
954 return -1;
955 }
956 qemu_macaddr_default_if_unset(&nd->macaddr);
957
958 if (nic->has_vectors) {
959 if (nic->vectors > 0x7ffffff) {
960 error_setg(errp, "invalid # of vectors: %"PRIu32, nic->vectors);
961 return -1;
962 }
963 nd->nvectors = nic->vectors;
964 } else {
965 nd->nvectors = DEV_NVECTORS_UNSPECIFIED;
966 }
967
968 nd->used = 1;
969 nb_nics++;
970
971 return idx;
972}
973
974
975static int (* const net_client_init_fun[NET_CLIENT_DRIVER__MAX])(
976 const Netdev *netdev,
977 const char *name,
978 NetClientState *peer, Error **errp) = {
979 [NET_CLIENT_DRIVER_NIC] = net_init_nic,
980#ifdef CONFIG_SLIRP
981 [NET_CLIENT_DRIVER_USER] = net_init_slirp,
982#endif
983 [NET_CLIENT_DRIVER_TAP] = net_init_tap,
984 [NET_CLIENT_DRIVER_SOCKET] = net_init_socket,
985#ifdef CONFIG_VDE
986 [NET_CLIENT_DRIVER_VDE] = net_init_vde,
987#endif
988#ifdef CONFIG_NETMAP
989 [NET_CLIENT_DRIVER_NETMAP] = net_init_netmap,
990#endif
991#ifdef CONFIG_NET_BRIDGE
992 [NET_CLIENT_DRIVER_BRIDGE] = net_init_bridge,
993#endif
994 [NET_CLIENT_DRIVER_HUBPORT] = net_init_hubport,
995#ifdef CONFIG_VHOST_NET_USER
996 [NET_CLIENT_DRIVER_VHOST_USER] = net_init_vhost_user,
997#endif
998#ifdef CONFIG_VHOST_NET_VDPA
999 [NET_CLIENT_DRIVER_VHOST_VDPA] = net_init_vhost_vdpa,
1000#endif
1001#ifdef CONFIG_L2TPV3
1002 [NET_CLIENT_DRIVER_L2TPV3] = net_init_l2tpv3,
1003#endif
1004};
1005
1006
1007static int net_client_init1(const Netdev *netdev, bool is_netdev, Error **errp)
1008{
1009 NetClientState *peer = NULL;
1010 NetClientState *nc;
1011
1012 if (is_netdev) {
1013 if (netdev->type == NET_CLIENT_DRIVER_NIC ||
1014 !net_client_init_fun[netdev->type]) {
1015 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
1016 "a netdev backend type");
1017 return -1;
1018 }
1019 } else {
1020 if (netdev->type == NET_CLIENT_DRIVER_NONE) {
1021 return 0;
1022 }
1023 if (netdev->type == NET_CLIENT_DRIVER_HUBPORT ||
1024 !net_client_init_fun[netdev->type]) {
1025 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
1026 "a net backend type (maybe it is not compiled "
1027 "into this binary)");
1028 return -1;
1029 }
1030
1031
1032 if (netdev->type != NET_CLIENT_DRIVER_NIC ||
1033 !netdev->u.nic.has_netdev) {
1034 peer = net_hub_add_port(0, NULL, NULL);
1035 }
1036 }
1037
1038 nc = qemu_find_netdev(netdev->id);
1039 if (nc) {
1040 error_setg(errp, "Duplicate ID '%s'", netdev->id);
1041 return -1;
1042 }
1043
1044 if (net_client_init_fun[netdev->type](netdev, netdev->id, peer, errp) < 0) {
1045
1046 if (errp && !*errp) {
1047 error_setg(errp, "Device '%s' could not be initialized",
1048 NetClientDriver_str(netdev->type));
1049 }
1050 return -1;
1051 }
1052
1053 if (is_netdev) {
1054 nc = qemu_find_netdev(netdev->id);
1055 assert(nc);
1056 nc->is_netdev = true;
1057 }
1058
1059 return 0;
1060}
1061
1062void show_netdevs(void)
1063{
1064 int idx;
1065 const char *available_netdevs[] = {
1066 "socket",
1067 "hubport",
1068 "tap",
1069#ifdef CONFIG_SLIRP
1070 "user",
1071#endif
1072#ifdef CONFIG_L2TPV3
1073 "l2tpv3",
1074#endif
1075#ifdef CONFIG_VDE
1076 "vde",
1077#endif
1078#ifdef CONFIG_NET_BRIDGE
1079 "bridge",
1080#endif
1081#ifdef CONFIG_NETMAP
1082 "netmap",
1083#endif
1084#ifdef CONFIG_POSIX
1085 "vhost-user",
1086#endif
1087#ifdef CONFIG_VHOST_VDPA
1088 "vhost-vdpa",
1089#endif
1090 };
1091
1092 qemu_printf("Available netdev backend types:\n");
1093 for (idx = 0; idx < ARRAY_SIZE(available_netdevs); idx++) {
1094 qemu_printf("%s\n", available_netdevs[idx]);
1095 }
1096}
1097
1098static int net_client_init(QemuOpts *opts, bool is_netdev, Error **errp)
1099{
1100 gchar **substrings = NULL;
1101 Netdev *object = NULL;
1102 int ret = -1;
1103 Visitor *v = opts_visitor_new(opts);
1104
1105
1106 const char *ip6_net = qemu_opt_get(opts, "ipv6-net");
1107
1108 if (ip6_net) {
1109 char *prefix_addr;
1110 unsigned long prefix_len = 64;
1111
1112 substrings = g_strsplit(ip6_net, "/", 2);
1113 if (!substrings || !substrings[0]) {
1114 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "ipv6-net",
1115 "a valid IPv6 prefix");
1116 goto out;
1117 }
1118
1119 prefix_addr = substrings[0];
1120
1121
1122 if (substrings[1] &&
1123 qemu_strtoul(substrings[1], NULL, 10, &prefix_len))
1124 {
1125 error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1126 "ipv6-prefixlen", "a number");
1127 goto out;
1128 }
1129
1130 qemu_opt_set(opts, "ipv6-prefix", prefix_addr, &error_abort);
1131 qemu_opt_set_number(opts, "ipv6-prefixlen", prefix_len,
1132 &error_abort);
1133 qemu_opt_unset(opts, "ipv6-net");
1134 }
1135
1136
1137 if (!is_netdev && !qemu_opts_id(opts)) {
1138 qemu_opts_set_id(opts, id_generate(ID_NET));
1139 }
1140
1141 if (visit_type_Netdev(v, NULL, &object, errp)) {
1142 ret = net_client_init1(object, is_netdev, errp);
1143 }
1144
1145 qapi_free_Netdev(object);
1146
1147out:
1148 g_strfreev(substrings);
1149 visit_free(v);
1150 return ret;
1151}
1152
1153void netdev_add(QemuOpts *opts, Error **errp)
1154{
1155 net_client_init(opts, true, errp);
1156}
1157
1158void qmp_netdev_add(Netdev *netdev, Error **errp)
1159{
1160 if (!id_wellformed(netdev->id)) {
1161 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "id", "an identifier");
1162 return;
1163 }
1164
1165 net_client_init1(netdev, true, errp);
1166}
1167
1168void qmp_netdev_del(const char *id, Error **errp)
1169{
1170 NetClientState *nc;
1171 QemuOpts *opts;
1172
1173 nc = qemu_find_netdev(id);
1174 if (!nc) {
1175 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1176 "Device '%s' not found", id);
1177 return;
1178 }
1179
1180 if (!nc->is_netdev) {
1181 error_setg(errp, "Device '%s' is not a netdev", id);
1182 return;
1183 }
1184
1185 qemu_del_net_client(nc);
1186
1187
1188
1189
1190
1191
1192 opts = qemu_opts_find(qemu_find_opts("netdev"), id);
1193 if (opts) {
1194 qemu_opts_del(opts);
1195 }
1196}
1197
1198static void netfilter_print_info(Monitor *mon, NetFilterState *nf)
1199{
1200 char *str;
1201 ObjectProperty *prop;
1202 ObjectPropertyIterator iter;
1203 Visitor *v;
1204
1205
1206 object_property_iter_init(&iter, OBJECT(nf));
1207 while ((prop = object_property_iter_next(&iter))) {
1208 if (!strcmp(prop->name, "type")) {
1209 continue;
1210 }
1211 v = string_output_visitor_new(false, &str);
1212 object_property_get(OBJECT(nf), prop->name, v, NULL);
1213 visit_complete(v, &str);
1214 visit_free(v);
1215 monitor_printf(mon, ",%s=%s", prop->name, str);
1216 g_free(str);
1217 }
1218 monitor_printf(mon, "\n");
1219}
1220
1221void print_net_client(Monitor *mon, NetClientState *nc)
1222{
1223 NetFilterState *nf;
1224
1225 monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name,
1226 nc->queue_index,
1227 NetClientDriver_str(nc->info->type),
1228 nc->info_str);
1229 if (!QTAILQ_EMPTY(&nc->filters)) {
1230 monitor_printf(mon, "filters:\n");
1231 }
1232 QTAILQ_FOREACH(nf, &nc->filters, next) {
1233 monitor_printf(mon, " - %s: type=%s",
1234 object_get_canonical_path_component(OBJECT(nf)),
1235 object_get_typename(OBJECT(nf)));
1236 netfilter_print_info(mon, nf);
1237 }
1238}
1239
1240RxFilterInfoList *qmp_query_rx_filter(bool has_name, const char *name,
1241 Error **errp)
1242{
1243 NetClientState *nc;
1244 RxFilterInfoList *filter_list = NULL, **tail = &filter_list;
1245
1246 QTAILQ_FOREACH(nc, &net_clients, next) {
1247 RxFilterInfo *info;
1248
1249 if (has_name && strcmp(nc->name, name) != 0) {
1250 continue;
1251 }
1252
1253
1254 if (nc->info->type != NET_CLIENT_DRIVER_NIC) {
1255 if (has_name) {
1256 error_setg(errp, "net client(%s) isn't a NIC", name);
1257 assert(!filter_list);
1258 return NULL;
1259 }
1260 continue;
1261 }
1262
1263
1264
1265
1266 if (nc->queue_index != 0)
1267 continue;
1268
1269 if (nc->info->query_rx_filter) {
1270 info = nc->info->query_rx_filter(nc);
1271 QAPI_LIST_APPEND(tail, info);
1272 } else if (has_name) {
1273 error_setg(errp, "net client(%s) doesn't support"
1274 " rx-filter querying", name);
1275 assert(!filter_list);
1276 return NULL;
1277 }
1278
1279 if (has_name) {
1280 break;
1281 }
1282 }
1283
1284 if (filter_list == NULL && has_name) {
1285 error_setg(errp, "invalid net client name: %s", name);
1286 }
1287
1288 return filter_list;
1289}
1290
1291void hmp_info_network(Monitor *mon, const QDict *qdict)
1292{
1293 NetClientState *nc, *peer;
1294 NetClientDriver type;
1295
1296 net_hub_info(mon);
1297
1298 QTAILQ_FOREACH(nc, &net_clients, next) {
1299 peer = nc->peer;
1300 type = nc->info->type;
1301
1302
1303 if (net_hub_id_for_client(nc, NULL) == 0) {
1304 continue;
1305 }
1306
1307 if (!peer || type == NET_CLIENT_DRIVER_NIC) {
1308 print_net_client(mon, nc);
1309 }
1310 if (peer && type == NET_CLIENT_DRIVER_NIC) {
1311 monitor_printf(mon, " \\ ");
1312 print_net_client(mon, peer);
1313 }
1314 }
1315}
1316
1317void colo_notify_filters_event(int event, Error **errp)
1318{
1319 NetClientState *nc;
1320 NetFilterState *nf;
1321 NetFilterClass *nfc = NULL;
1322 Error *local_err = NULL;
1323
1324 QTAILQ_FOREACH(nc, &net_clients, next) {
1325 QTAILQ_FOREACH(nf, &nc->filters, next) {
1326 nfc = NETFILTER_GET_CLASS(OBJECT(nf));
1327 nfc->handle_event(nf, event, &local_err);
1328 if (local_err) {
1329 error_propagate(errp, local_err);
1330 return;
1331 }
1332 }
1333 }
1334}
1335
1336void qmp_set_link(const char *name, bool up, Error **errp)
1337{
1338 NetClientState *ncs[MAX_QUEUE_NUM];
1339 NetClientState *nc;
1340 int queues, i;
1341
1342 queues = qemu_find_net_clients_except(name, ncs,
1343 NET_CLIENT_DRIVER__MAX,
1344 MAX_QUEUE_NUM);
1345
1346 if (queues == 0) {
1347 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1348 "Device '%s' not found", name);
1349 return;
1350 }
1351 nc = ncs[0];
1352
1353 for (i = 0; i < queues; i++) {
1354 ncs[i]->link_down = !up;
1355 }
1356
1357 if (nc->info->link_status_changed) {
1358 nc->info->link_status_changed(nc);
1359 }
1360
1361 if (nc->peer) {
1362
1363
1364
1365
1366
1367
1368
1369
1370 if (nc->peer->info->type == NET_CLIENT_DRIVER_NIC) {
1371 for (i = 0; i < queues; i++) {
1372 ncs[i]->peer->link_down = !up;
1373 }
1374 }
1375 if (nc->peer->info->link_status_changed) {
1376 nc->peer->info->link_status_changed(nc->peer);
1377 }
1378 }
1379}
1380
1381static void net_vm_change_state_handler(void *opaque, bool running,
1382 RunState state)
1383{
1384 NetClientState *nc;
1385 NetClientState *tmp;
1386
1387 QTAILQ_FOREACH_SAFE(nc, &net_clients, next, tmp) {
1388 if (running) {
1389
1390 if (nc->peer && qemu_can_send_packet(nc)) {
1391 qemu_flush_queued_packets(nc->peer);
1392 }
1393 } else {
1394
1395
1396
1397 qemu_flush_or_purge_queued_packets(nc, true);
1398 }
1399 }
1400}
1401
1402void net_cleanup(void)
1403{
1404 NetClientState *nc;
1405
1406
1407 colo_compare_cleanup();
1408
1409
1410
1411
1412 while (!QTAILQ_EMPTY(&net_clients)) {
1413 nc = QTAILQ_FIRST(&net_clients);
1414 if (nc->info->type == NET_CLIENT_DRIVER_NIC) {
1415 qemu_del_nic(qemu_get_nic(nc));
1416 } else {
1417 qemu_del_net_client(nc);
1418 }
1419 }
1420
1421 qemu_del_vm_change_state_handler(net_change_state_entry);
1422}
1423
1424void net_check_clients(void)
1425{
1426 NetClientState *nc;
1427 int i;
1428
1429 net_hub_check_clients();
1430
1431 QTAILQ_FOREACH(nc, &net_clients, next) {
1432 if (!nc->peer) {
1433 warn_report("%s %s has no peer",
1434 nc->info->type == NET_CLIENT_DRIVER_NIC
1435 ? "nic" : "netdev",
1436 nc->name);
1437 }
1438 }
1439
1440
1441
1442
1443
1444 for (i = 0; i < MAX_NICS; i++) {
1445 NICInfo *nd = &nd_table[i];
1446 if (nd->used && !nd->instantiated) {
1447 warn_report("requested NIC (%s, model %s) "
1448 "was not created (not supported by this machine?)",
1449 nd->name ? nd->name : "anonymous",
1450 nd->model ? nd->model : "unspecified");
1451 }
1452 }
1453}
1454
1455static int net_init_client(void *dummy, QemuOpts *opts, Error **errp)
1456{
1457 return net_client_init(opts, false, errp);
1458}
1459
1460static int net_init_netdev(void *dummy, QemuOpts *opts, Error **errp)
1461{
1462 const char *type = qemu_opt_get(opts, "type");
1463
1464 if (type && is_help_option(type)) {
1465 show_netdevs();
1466 exit(0);
1467 }
1468 return net_client_init(opts, true, errp);
1469}
1470
1471
1472static int net_param_nic(void *dummy, QemuOpts *opts, Error **errp)
1473{
1474 char *mac, *nd_id;
1475 int idx, ret;
1476 NICInfo *ni;
1477 const char *type;
1478
1479 type = qemu_opt_get(opts, "type");
1480 if (type && g_str_equal(type, "none")) {
1481 return 0;
1482 }
1483
1484 idx = nic_get_free_idx();
1485 if (idx == -1 || nb_nics >= MAX_NICS) {
1486 error_setg(errp, "no more on-board/default NIC slots available");
1487 return -1;
1488 }
1489
1490 if (!type) {
1491 qemu_opt_set(opts, "type", "user", &error_abort);
1492 }
1493
1494 ni = &nd_table[idx];
1495 memset(ni, 0, sizeof(*ni));
1496 ni->model = qemu_opt_get_del(opts, "model");
1497
1498
1499 nd_id = g_strdup(qemu_opts_id(opts));
1500 if (!nd_id) {
1501 nd_id = id_generate(ID_NET);
1502 qemu_opts_set_id(opts, nd_id);
1503 }
1504
1505
1506 mac = qemu_opt_get_del(opts, "mac");
1507 if (mac) {
1508 ret = net_parse_macaddr(ni->macaddr.a, mac);
1509 g_free(mac);
1510 if (ret) {
1511 error_setg(errp, "invalid syntax for ethernet address");
1512 goto out;
1513 }
1514 if (is_multicast_ether_addr(ni->macaddr.a)) {
1515 error_setg(errp, "NIC cannot have multicast MAC address");
1516 ret = -1;
1517 goto out;
1518 }
1519 }
1520 qemu_macaddr_default_if_unset(&ni->macaddr);
1521
1522 ret = net_client_init(opts, true, errp);
1523 if (ret == 0) {
1524 ni->netdev = qemu_find_netdev(nd_id);
1525 ni->used = true;
1526 nb_nics++;
1527 }
1528
1529out:
1530 g_free(nd_id);
1531 return ret;
1532}
1533
1534int net_init_clients(Error **errp)
1535{
1536 net_change_state_entry =
1537 qemu_add_vm_change_state_handler(net_vm_change_state_handler, NULL);
1538
1539 QTAILQ_INIT(&net_clients);
1540
1541 if (qemu_opts_foreach(qemu_find_opts("netdev"),
1542 net_init_netdev, NULL, errp)) {
1543 return -1;
1544 }
1545
1546 if (qemu_opts_foreach(qemu_find_opts("nic"), net_param_nic, NULL, errp)) {
1547 return -1;
1548 }
1549
1550 if (qemu_opts_foreach(qemu_find_opts("net"), net_init_client, NULL, errp)) {
1551 return -1;
1552 }
1553
1554 return 0;
1555}
1556
1557int net_client_parse(QemuOptsList *opts_list, const char *optarg)
1558{
1559 if (!qemu_opts_parse_noisily(opts_list, optarg, true)) {
1560 return -1;
1561 }
1562
1563 return 0;
1564}
1565
1566
1567
1568uint32_t net_crc32(const uint8_t *p, int len)
1569{
1570 uint32_t crc;
1571 int carry, i, j;
1572 uint8_t b;
1573
1574 crc = 0xffffffff;
1575 for (i = 0; i < len; i++) {
1576 b = *p++;
1577 for (j = 0; j < 8; j++) {
1578 carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01);
1579 crc <<= 1;
1580 b >>= 1;
1581 if (carry) {
1582 crc = ((crc ^ POLYNOMIAL_BE) | carry);
1583 }
1584 }
1585 }
1586
1587 return crc;
1588}
1589
1590uint32_t net_crc32_le(const uint8_t *p, int len)
1591{
1592 uint32_t crc;
1593 int carry, i, j;
1594 uint8_t b;
1595
1596 crc = 0xffffffff;
1597 for (i = 0; i < len; i++) {
1598 b = *p++;
1599 for (j = 0; j < 8; j++) {
1600 carry = (crc & 0x1) ^ (b & 0x01);
1601 crc >>= 1;
1602 b >>= 1;
1603 if (carry) {
1604 crc ^= POLYNOMIAL_LE;
1605 }
1606 }
1607 }
1608
1609 return crc;
1610}
1611
1612QemuOptsList qemu_netdev_opts = {
1613 .name = "netdev",
1614 .implied_opt_name = "type",
1615 .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head),
1616 .desc = {
1617
1618
1619
1620
1621 { }
1622 },
1623};
1624
1625QemuOptsList qemu_nic_opts = {
1626 .name = "nic",
1627 .implied_opt_name = "type",
1628 .head = QTAILQ_HEAD_INITIALIZER(qemu_nic_opts.head),
1629 .desc = {
1630
1631
1632
1633
1634 { }
1635 },
1636};
1637
1638QemuOptsList qemu_net_opts = {
1639 .name = "net",
1640 .implied_opt_name = "type",
1641 .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head),
1642 .desc = {
1643
1644
1645
1646
1647 { }
1648 },
1649};
1650
1651void net_socket_rs_init(SocketReadState *rs,
1652 SocketReadStateFinalize *finalize,
1653 bool vnet_hdr)
1654{
1655 rs->state = 0;
1656 rs->vnet_hdr = vnet_hdr;
1657 rs->index = 0;
1658 rs->packet_len = 0;
1659 rs->vnet_hdr_len = 0;
1660 memset(rs->buf, 0, sizeof(rs->buf));
1661 rs->finalize = finalize;
1662}
1663
1664
1665
1666
1667
1668
1669int net_fill_rstate(SocketReadState *rs, const uint8_t *buf, int size)
1670{
1671 unsigned int l;
1672
1673 while (size > 0) {
1674
1675
1676
1677
1678
1679 switch (rs->state) {
1680 case 0:
1681 l = 4 - rs->index;
1682 if (l > size) {
1683 l = size;
1684 }
1685 memcpy(rs->buf + rs->index, buf, l);
1686 buf += l;
1687 size -= l;
1688 rs->index += l;
1689 if (rs->index == 4) {
1690
1691 rs->packet_len = ntohl(*(uint32_t *)rs->buf);
1692 rs->index = 0;
1693 if (rs->vnet_hdr) {
1694 rs->state = 1;
1695 } else {
1696 rs->state = 2;
1697 rs->vnet_hdr_len = 0;
1698 }
1699 }
1700 break;
1701 case 1:
1702 l = 4 - rs->index;
1703 if (l > size) {
1704 l = size;
1705 }
1706 memcpy(rs->buf + rs->index, buf, l);
1707 buf += l;
1708 size -= l;
1709 rs->index += l;
1710 if (rs->index == 4) {
1711
1712 rs->vnet_hdr_len = ntohl(*(uint32_t *)rs->buf);
1713 rs->index = 0;
1714 rs->state = 2;
1715 }
1716 break;
1717 case 2:
1718 l = rs->packet_len - rs->index;
1719 if (l > size) {
1720 l = size;
1721 }
1722 if (rs->index + l <= sizeof(rs->buf)) {
1723 memcpy(rs->buf + rs->index, buf, l);
1724 } else {
1725 fprintf(stderr, "serious error: oversized packet received,"
1726 "connection terminated.\n");
1727 rs->index = rs->state = 0;
1728 return -1;
1729 }
1730
1731 rs->index += l;
1732 buf += l;
1733 size -= l;
1734 if (rs->index >= rs->packet_len) {
1735 rs->index = 0;
1736 rs->state = 0;
1737 assert(rs->finalize);
1738 rs->finalize(rs);
1739 }
1740 break;
1741 }
1742 }
1743
1744 assert(size == 0);
1745 return 0;
1746}
1747