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24#include "qemu/osdep.h"
25
26#include "net/net.h"
27#include "clients.h"
28#include "hub.h"
29#include "net/slirp.h"
30#include "net/eth.h"
31#include "util.h"
32
33#include "monitor/monitor.h"
34#include "qemu-common.h"
35#include "qemu/help_option.h"
36#include "qapi/qmp/qerror.h"
37#include "qemu/error-report.h"
38#include "qemu/sockets.h"
39#include "qemu/cutils.h"
40#include "qemu/config-file.h"
41#include "qmp-commands.h"
42#include "hw/qdev.h"
43#include "qemu/iov.h"
44#include "qemu/main-loop.h"
45#include "qapi-visit.h"
46#include "qapi/opts-visitor.h"
47#include "sysemu/sysemu.h"
48#include "sysemu/qtest.h"
49#include "net/filter.h"
50#include "qapi/string-output-visitor.h"
51
52
53#if !defined(_WIN32)
54# define CONFIG_NET_BRIDGE
55#endif
56
57static VMChangeStateEntry *net_change_state_entry;
58static QTAILQ_HEAD(, NetClientState) net_clients;
59
60const char *host_net_devices[] = {
61 "tap",
62 "socket",
63 "dump",
64#ifdef CONFIG_NET_BRIDGE
65 "bridge",
66#endif
67#ifdef CONFIG_NETMAP
68 "netmap",
69#endif
70#ifdef CONFIG_SLIRP
71 "user",
72#endif
73#ifdef CONFIG_VDE
74 "vde",
75#endif
76 "vhost-user",
77 NULL,
78};
79
80
81
82
83static int get_str_sep(char *buf, int buf_size, const char **pp, int sep)
84{
85 const char *p, *p1;
86 int len;
87 p = *pp;
88 p1 = strchr(p, sep);
89 if (!p1)
90 return -1;
91 len = p1 - p;
92 p1++;
93 if (buf_size > 0) {
94 if (len > buf_size - 1)
95 len = buf_size - 1;
96 memcpy(buf, p, len);
97 buf[len] = '\0';
98 }
99 *pp = p1;
100 return 0;
101}
102
103int parse_host_port(struct sockaddr_in *saddr, const char *str)
104{
105 char buf[512];
106 struct hostent *he;
107 const char *p, *r;
108 int port;
109
110 p = str;
111 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0)
112 return -1;
113 saddr->sin_family = AF_INET;
114 if (buf[0] == '\0') {
115 saddr->sin_addr.s_addr = 0;
116 } else {
117 if (qemu_isdigit(buf[0])) {
118 if (!inet_aton(buf, &saddr->sin_addr))
119 return -1;
120 } else {
121 if ((he = gethostbyname(buf)) == NULL)
122 return - 1;
123 saddr->sin_addr = *(struct in_addr *)he->h_addr;
124 }
125 }
126 port = strtol(p, (char **)&r, 0);
127 if (r == p)
128 return -1;
129 saddr->sin_port = htons(port);
130 return 0;
131}
132
133char *qemu_mac_strdup_printf(const uint8_t *macaddr)
134{
135 return g_strdup_printf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x",
136 macaddr[0], macaddr[1], macaddr[2],
137 macaddr[3], macaddr[4], macaddr[5]);
138}
139
140void qemu_format_nic_info_str(NetClientState *nc, uint8_t macaddr[6])
141{
142 snprintf(nc->info_str, sizeof(nc->info_str),
143 "model=%s,macaddr=%02x:%02x:%02x:%02x:%02x:%02x",
144 nc->model,
145 macaddr[0], macaddr[1], macaddr[2],
146 macaddr[3], macaddr[4], macaddr[5]);
147}
148
149static int mac_table[256] = {0};
150
151static void qemu_macaddr_set_used(MACAddr *macaddr)
152{
153 int index;
154
155 for (index = 0x56; index < 0xFF; index++) {
156 if (macaddr->a[5] == index) {
157 mac_table[index]++;
158 }
159 }
160}
161
162static void qemu_macaddr_set_free(MACAddr *macaddr)
163{
164 int index;
165 static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } };
166
167 if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) {
168 return;
169 }
170 for (index = 0x56; index < 0xFF; index++) {
171 if (macaddr->a[5] == index) {
172 mac_table[index]--;
173 }
174 }
175}
176
177static int qemu_macaddr_get_free(void)
178{
179 int index;
180
181 for (index = 0x56; index < 0xFF; index++) {
182 if (mac_table[index] == 0) {
183 return index;
184 }
185 }
186
187 return -1;
188}
189
190void qemu_macaddr_default_if_unset(MACAddr *macaddr)
191{
192 static const MACAddr zero = { .a = { 0,0,0,0,0,0 } };
193 static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } };
194
195 if (memcmp(macaddr, &zero, sizeof(zero)) != 0) {
196 if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) {
197 return;
198 } else {
199 qemu_macaddr_set_used(macaddr);
200 return;
201 }
202 }
203
204 macaddr->a[0] = 0x52;
205 macaddr->a[1] = 0x54;
206 macaddr->a[2] = 0x00;
207 macaddr->a[3] = 0x12;
208 macaddr->a[4] = 0x34;
209 macaddr->a[5] = qemu_macaddr_get_free();
210 qemu_macaddr_set_used(macaddr);
211}
212
213
214
215
216
217
218static char *assign_name(NetClientState *nc1, const char *model)
219{
220 NetClientState *nc;
221 int id = 0;
222
223 QTAILQ_FOREACH(nc, &net_clients, next) {
224 if (nc == nc1) {
225 continue;
226 }
227 if (strcmp(nc->model, model) == 0) {
228 id++;
229 }
230 }
231
232 return g_strdup_printf("%s.%d", model, id);
233}
234
235static void qemu_net_client_destructor(NetClientState *nc)
236{
237 g_free(nc);
238}
239
240static void qemu_net_client_setup(NetClientState *nc,
241 NetClientInfo *info,
242 NetClientState *peer,
243 const char *model,
244 const char *name,
245 NetClientDestructor *destructor)
246{
247 nc->info = info;
248 nc->model = g_strdup(model);
249 if (name) {
250 nc->name = g_strdup(name);
251 } else {
252 nc->name = assign_name(nc, model);
253 }
254
255 if (peer) {
256 assert(!peer->peer);
257 nc->peer = peer;
258 peer->peer = nc;
259 }
260 QTAILQ_INSERT_TAIL(&net_clients, nc, next);
261
262 nc->incoming_queue = qemu_new_net_queue(qemu_deliver_packet_iov, nc);
263 nc->destructor = destructor;
264 QTAILQ_INIT(&nc->filters);
265}
266
267NetClientState *qemu_new_net_client(NetClientInfo *info,
268 NetClientState *peer,
269 const char *model,
270 const char *name)
271{
272 NetClientState *nc;
273
274 assert(info->size >= sizeof(NetClientState));
275
276 nc = g_malloc0(info->size);
277 qemu_net_client_setup(nc, info, peer, model, name,
278 qemu_net_client_destructor);
279
280 return nc;
281}
282
283NICState *qemu_new_nic(NetClientInfo *info,
284 NICConf *conf,
285 const char *model,
286 const char *name,
287 void *opaque)
288{
289 NetClientState **peers = conf->peers.ncs;
290 NICState *nic;
291 int i, queues = MAX(1, conf->peers.queues);
292
293 assert(info->type == NET_CLIENT_DRIVER_NIC);
294 assert(info->size >= sizeof(NICState));
295
296 nic = g_malloc0(info->size + sizeof(NetClientState) * queues);
297 nic->ncs = (void *)nic + info->size;
298 nic->conf = conf;
299 nic->opaque = opaque;
300
301 for (i = 0; i < queues; i++) {
302 qemu_net_client_setup(&nic->ncs[i], info, peers[i], model, name,
303 NULL);
304 nic->ncs[i].queue_index = i;
305 }
306
307 return nic;
308}
309
310NetClientState *qemu_get_subqueue(NICState *nic, int queue_index)
311{
312 return nic->ncs + queue_index;
313}
314
315NetClientState *qemu_get_queue(NICState *nic)
316{
317 return qemu_get_subqueue(nic, 0);
318}
319
320NICState *qemu_get_nic(NetClientState *nc)
321{
322 NetClientState *nc0 = nc - nc->queue_index;
323
324 return (NICState *)((void *)nc0 - nc->info->size);
325}
326
327void *qemu_get_nic_opaque(NetClientState *nc)
328{
329 NICState *nic = qemu_get_nic(nc);
330
331 return nic->opaque;
332}
333
334static void qemu_cleanup_net_client(NetClientState *nc)
335{
336 QTAILQ_REMOVE(&net_clients, nc, next);
337
338 if (nc->info->cleanup) {
339 nc->info->cleanup(nc);
340 }
341}
342
343static void qemu_free_net_client(NetClientState *nc)
344{
345 if (nc->incoming_queue) {
346 qemu_del_net_queue(nc->incoming_queue);
347 }
348 if (nc->peer) {
349 nc->peer->peer = NULL;
350 }
351 g_free(nc->name);
352 g_free(nc->model);
353 if (nc->destructor) {
354 nc->destructor(nc);
355 }
356}
357
358void qemu_del_net_client(NetClientState *nc)
359{
360 NetClientState *ncs[MAX_QUEUE_NUM];
361 int queues, i;
362 NetFilterState *nf, *next;
363
364 assert(nc->info->type != NET_CLIENT_DRIVER_NIC);
365
366
367
368
369 queues = qemu_find_net_clients_except(nc->name, ncs,
370 NET_CLIENT_DRIVER_NIC,
371 MAX_QUEUE_NUM);
372 assert(queues != 0);
373
374 QTAILQ_FOREACH_SAFE(nf, &nc->filters, next, next) {
375 object_unparent(OBJECT(nf));
376 }
377
378
379 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_NIC) {
380 NICState *nic = qemu_get_nic(nc->peer);
381 if (nic->peer_deleted) {
382 return;
383 }
384 nic->peer_deleted = true;
385
386 for (i = 0; i < queues; i++) {
387 ncs[i]->peer->link_down = true;
388 }
389
390 if (nc->peer->info->link_status_changed) {
391 nc->peer->info->link_status_changed(nc->peer);
392 }
393
394 for (i = 0; i < queues; i++) {
395 qemu_cleanup_net_client(ncs[i]);
396 }
397
398 return;
399 }
400
401 for (i = 0; i < queues; i++) {
402 qemu_cleanup_net_client(ncs[i]);
403 qemu_free_net_client(ncs[i]);
404 }
405}
406
407void qemu_del_nic(NICState *nic)
408{
409 int i, queues = MAX(nic->conf->peers.queues, 1);
410
411 qemu_macaddr_set_free(&nic->conf->macaddr);
412
413
414 if (nic->peer_deleted) {
415 for (i = 0; i < queues; i++) {
416 qemu_free_net_client(qemu_get_subqueue(nic, i)->peer);
417 }
418 }
419
420 for (i = queues - 1; i >= 0; i--) {
421 NetClientState *nc = qemu_get_subqueue(nic, i);
422
423 qemu_cleanup_net_client(nc);
424 qemu_free_net_client(nc);
425 }
426
427 g_free(nic);
428}
429
430void qemu_foreach_nic(qemu_nic_foreach func, void *opaque)
431{
432 NetClientState *nc;
433
434 QTAILQ_FOREACH(nc, &net_clients, next) {
435 if (nc->info->type == NET_CLIENT_DRIVER_NIC) {
436 if (nc->queue_index == 0) {
437 func(qemu_get_nic(nc), opaque);
438 }
439 }
440 }
441}
442
443bool qemu_has_ufo(NetClientState *nc)
444{
445 if (!nc || !nc->info->has_ufo) {
446 return false;
447 }
448
449 return nc->info->has_ufo(nc);
450}
451
452bool qemu_has_vnet_hdr(NetClientState *nc)
453{
454 if (!nc || !nc->info->has_vnet_hdr) {
455 return false;
456 }
457
458 return nc->info->has_vnet_hdr(nc);
459}
460
461bool qemu_has_vnet_hdr_len(NetClientState *nc, int len)
462{
463 if (!nc || !nc->info->has_vnet_hdr_len) {
464 return false;
465 }
466
467 return nc->info->has_vnet_hdr_len(nc, len);
468}
469
470void qemu_using_vnet_hdr(NetClientState *nc, bool enable)
471{
472 if (!nc || !nc->info->using_vnet_hdr) {
473 return;
474 }
475
476 nc->info->using_vnet_hdr(nc, enable);
477}
478
479void qemu_set_offload(NetClientState *nc, int csum, int tso4, int tso6,
480 int ecn, int ufo)
481{
482 if (!nc || !nc->info->set_offload) {
483 return;
484 }
485
486 nc->info->set_offload(nc, csum, tso4, tso6, ecn, ufo);
487}
488
489void qemu_set_vnet_hdr_len(NetClientState *nc, int len)
490{
491 if (!nc || !nc->info->set_vnet_hdr_len) {
492 return;
493 }
494
495 nc->vnet_hdr_len = len;
496 nc->info->set_vnet_hdr_len(nc, len);
497}
498
499int qemu_set_vnet_le(NetClientState *nc, bool is_le)
500{
501#ifdef HOST_WORDS_BIGENDIAN
502 if (!nc || !nc->info->set_vnet_le) {
503 return -ENOSYS;
504 }
505
506 return nc->info->set_vnet_le(nc, is_le);
507#else
508 return 0;
509#endif
510}
511
512int qemu_set_vnet_be(NetClientState *nc, bool is_be)
513{
514#ifdef HOST_WORDS_BIGENDIAN
515 return 0;
516#else
517 if (!nc || !nc->info->set_vnet_be) {
518 return -ENOSYS;
519 }
520
521 return nc->info->set_vnet_be(nc, is_be);
522#endif
523}
524
525int qemu_can_send_packet(NetClientState *sender)
526{
527 int vm_running = runstate_is_running();
528
529 if (!vm_running) {
530 return 0;
531 }
532
533 if (!sender->peer) {
534 return 1;
535 }
536
537 if (sender->peer->receive_disabled) {
538 return 0;
539 } else if (sender->peer->info->can_receive &&
540 !sender->peer->info->can_receive(sender->peer)) {
541 return 0;
542 }
543 return 1;
544}
545
546static ssize_t filter_receive_iov(NetClientState *nc,
547 NetFilterDirection direction,
548 NetClientState *sender,
549 unsigned flags,
550 const struct iovec *iov,
551 int iovcnt,
552 NetPacketSent *sent_cb)
553{
554 ssize_t ret = 0;
555 NetFilterState *nf = NULL;
556
557 if (direction == NET_FILTER_DIRECTION_TX) {
558 QTAILQ_FOREACH(nf, &nc->filters, next) {
559 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov,
560 iovcnt, sent_cb);
561 if (ret) {
562 return ret;
563 }
564 }
565 } else {
566 QTAILQ_FOREACH_REVERSE(nf, &nc->filters, NetFilterHead, next) {
567 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov,
568 iovcnt, sent_cb);
569 if (ret) {
570 return ret;
571 }
572 }
573 }
574
575 return ret;
576}
577
578static ssize_t filter_receive(NetClientState *nc,
579 NetFilterDirection direction,
580 NetClientState *sender,
581 unsigned flags,
582 const uint8_t *data,
583 size_t size,
584 NetPacketSent *sent_cb)
585{
586 struct iovec iov = {
587 .iov_base = (void *)data,
588 .iov_len = size
589 };
590
591 return filter_receive_iov(nc, direction, sender, flags, &iov, 1, sent_cb);
592}
593
594void qemu_purge_queued_packets(NetClientState *nc)
595{
596 if (!nc->peer) {
597 return;
598 }
599
600 qemu_net_queue_purge(nc->peer->incoming_queue, nc);
601}
602
603static
604void qemu_flush_or_purge_queued_packets(NetClientState *nc, bool purge)
605{
606 nc->receive_disabled = 0;
607
608 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_HUBPORT) {
609 if (net_hub_flush(nc->peer)) {
610 qemu_notify_event();
611 }
612 }
613 if (qemu_net_queue_flush(nc->incoming_queue)) {
614
615
616
617 qemu_notify_event();
618 } else if (purge) {
619
620 qemu_net_queue_purge(nc->incoming_queue, nc);
621 }
622}
623
624void qemu_flush_queued_packets(NetClientState *nc)
625{
626 qemu_flush_or_purge_queued_packets(nc, false);
627}
628
629static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender,
630 unsigned flags,
631 const uint8_t *buf, int size,
632 NetPacketSent *sent_cb)
633{
634 NetQueue *queue;
635 int ret;
636
637#ifdef DEBUG_NET
638 printf("qemu_send_packet_async:\n");
639 qemu_hexdump((const char *)buf, stdout, "net", size);
640#endif
641
642 if (sender->link_down || !sender->peer) {
643 return size;
644 }
645
646
647 ret = filter_receive(sender, NET_FILTER_DIRECTION_TX,
648 sender, flags, buf, size, sent_cb);
649 if (ret) {
650 return ret;
651 }
652
653 ret = filter_receive(sender->peer, NET_FILTER_DIRECTION_RX,
654 sender, flags, buf, size, sent_cb);
655 if (ret) {
656 return ret;
657 }
658
659 queue = sender->peer->incoming_queue;
660
661 return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb);
662}
663
664ssize_t qemu_send_packet_async(NetClientState *sender,
665 const uint8_t *buf, int size,
666 NetPacketSent *sent_cb)
667{
668 return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE,
669 buf, size, sent_cb);
670}
671
672void qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size)
673{
674 qemu_send_packet_async(nc, buf, size, NULL);
675}
676
677ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size)
678{
679 return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW,
680 buf, size, NULL);
681}
682
683static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov,
684 int iovcnt, unsigned flags)
685{
686 uint8_t *buf = NULL;
687 uint8_t *buffer;
688 size_t offset;
689 ssize_t ret;
690
691 if (iovcnt == 1) {
692 buffer = iov[0].iov_base;
693 offset = iov[0].iov_len;
694 } else {
695 offset = iov_size(iov, iovcnt);
696 if (offset > NET_BUFSIZE) {
697 return -1;
698 }
699 buf = g_malloc(offset);
700 buffer = buf;
701 offset = iov_to_buf(iov, iovcnt, 0, buf, offset);
702 }
703
704 if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) {
705 ret = nc->info->receive_raw(nc, buffer, offset);
706 } else {
707 ret = nc->info->receive(nc, buffer, offset);
708 }
709
710 g_free(buf);
711 return ret;
712}
713
714ssize_t qemu_deliver_packet_iov(NetClientState *sender,
715 unsigned flags,
716 const struct iovec *iov,
717 int iovcnt,
718 void *opaque)
719{
720 NetClientState *nc = opaque;
721 int ret;
722
723 if (nc->link_down) {
724 return iov_size(iov, iovcnt);
725 }
726
727 if (nc->receive_disabled) {
728 return 0;
729 }
730
731 if (nc->info->receive_iov && !(flags & QEMU_NET_PACKET_FLAG_RAW)) {
732 ret = nc->info->receive_iov(nc, iov, iovcnt);
733 } else {
734 ret = nc_sendv_compat(nc, iov, iovcnt, flags);
735 }
736
737 if (ret == 0) {
738 nc->receive_disabled = 1;
739 }
740
741 return ret;
742}
743
744ssize_t qemu_sendv_packet_async(NetClientState *sender,
745 const struct iovec *iov, int iovcnt,
746 NetPacketSent *sent_cb)
747{
748 NetQueue *queue;
749 int ret;
750
751 if (sender->link_down || !sender->peer) {
752 return iov_size(iov, iovcnt);
753 }
754
755
756 ret = filter_receive_iov(sender, NET_FILTER_DIRECTION_TX, sender,
757 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb);
758 if (ret) {
759 return ret;
760 }
761
762 ret = filter_receive_iov(sender->peer, NET_FILTER_DIRECTION_RX, sender,
763 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb);
764 if (ret) {
765 return ret;
766 }
767
768 queue = sender->peer->incoming_queue;
769
770 return qemu_net_queue_send_iov(queue, sender,
771 QEMU_NET_PACKET_FLAG_NONE,
772 iov, iovcnt, sent_cb);
773}
774
775ssize_t
776qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt)
777{
778 return qemu_sendv_packet_async(nc, iov, iovcnt, NULL);
779}
780
781NetClientState *qemu_find_netdev(const char *id)
782{
783 NetClientState *nc;
784
785 QTAILQ_FOREACH(nc, &net_clients, next) {
786 if (nc->info->type == NET_CLIENT_DRIVER_NIC)
787 continue;
788 if (!strcmp(nc->name, id)) {
789 return nc;
790 }
791 }
792
793 return NULL;
794}
795
796int qemu_find_net_clients_except(const char *id, NetClientState **ncs,
797 NetClientDriver type, int max)
798{
799 NetClientState *nc;
800 int ret = 0;
801
802 QTAILQ_FOREACH(nc, &net_clients, next) {
803 if (nc->info->type == type) {
804 continue;
805 }
806 if (!id || !strcmp(nc->name, id)) {
807 if (ret < max) {
808 ncs[ret] = nc;
809 }
810 ret++;
811 }
812 }
813
814 return ret;
815}
816
817static int nic_get_free_idx(void)
818{
819 int index;
820
821 for (index = 0; index < MAX_NICS; index++)
822 if (!nd_table[index].used)
823 return index;
824 return -1;
825}
826
827int qemu_show_nic_models(const char *arg, const char *const *models)
828{
829 int i;
830
831 if (!arg || !is_help_option(arg)) {
832 return 0;
833 }
834
835 fprintf(stderr, "qemu: Supported NIC models: ");
836 for (i = 0 ; models[i]; i++)
837 fprintf(stderr, "%s%c", models[i], models[i+1] ? ',' : '\n');
838 return 1;
839}
840
841void 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
854int 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
871static 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
939static 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 [NET_CLIENT_DRIVER_DUMP] = net_init_dump,
956#ifdef CONFIG_NET_BRIDGE
957 [NET_CLIENT_DRIVER_BRIDGE] = net_init_bridge,
958#endif
959 [NET_CLIENT_DRIVER_HUBPORT] = net_init_hubport,
960#ifdef CONFIG_VHOST_NET_USED
961 [NET_CLIENT_DRIVER_VHOST_USER] = net_init_vhost_user,
962#endif
963#ifdef CONFIG_L2TPV3
964 [NET_CLIENT_DRIVER_L2TPV3] = net_init_l2tpv3,
965#endif
966};
967
968
969static int net_client_init1(const void *object, bool is_netdev, Error **errp)
970{
971 Netdev legacy = {0};
972 const Netdev *netdev;
973 const char *name;
974 NetClientState *peer = NULL;
975 static bool vlan_warned;
976
977 if (is_netdev) {
978 netdev = object;
979 name = netdev->id;
980
981 if (netdev->type == NET_CLIENT_DRIVER_DUMP ||
982 netdev->type == NET_CLIENT_DRIVER_NIC ||
983 !net_client_init_fun[netdev->type]) {
984 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
985 "a netdev backend type");
986 return -1;
987 }
988 } else {
989 const NetLegacy *net = object;
990 const NetLegacyOptions *opts = net->opts;
991 legacy.id = net->id;
992 netdev = &legacy;
993
994 name = net->has_id ? net->id : net->name;
995
996
997 switch (opts->type) {
998 case NET_LEGACY_OPTIONS_TYPE_NONE:
999 return 0;
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_DUMP:
1025 legacy.type = NET_CLIENT_DRIVER_DUMP;
1026 legacy.u.dump = opts->u.dump;
1027 break;
1028 case NET_LEGACY_OPTIONS_TYPE_BRIDGE:
1029 legacy.type = NET_CLIENT_DRIVER_BRIDGE;
1030 legacy.u.bridge = opts->u.bridge;
1031 break;
1032 case NET_LEGACY_OPTIONS_TYPE_NETMAP:
1033 legacy.type = NET_CLIENT_DRIVER_NETMAP;
1034 legacy.u.netmap = opts->u.netmap;
1035 break;
1036 case NET_LEGACY_OPTIONS_TYPE_VHOST_USER:
1037 legacy.type = NET_CLIENT_DRIVER_VHOST_USER;
1038 legacy.u.vhost_user = opts->u.vhost_user;
1039 break;
1040 default:
1041 abort();
1042 }
1043
1044 if (!net_client_init_fun[netdev->type]) {
1045 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
1046 "a net backend type (maybe it is not compiled "
1047 "into this binary)");
1048 return -1;
1049 }
1050
1051
1052 if (netdev->type != NET_CLIENT_DRIVER_NIC ||
1053 !opts->u.nic.has_netdev) {
1054 peer = net_hub_add_port(net->has_vlan ? net->vlan : 0, NULL);
1055 }
1056
1057 if (net->has_vlan && !vlan_warned) {
1058 error_report("'vlan' is deprecated. Please use 'netdev' instead.");
1059 vlan_warned = true;
1060 }
1061 }
1062
1063 if (net_client_init_fun[netdev->type](netdev, name, peer, errp) < 0) {
1064
1065 if (errp && !*errp) {
1066 error_setg(errp, QERR_DEVICE_INIT_FAILED,
1067 NetClientDriver_lookup[netdev->type]);
1068 }
1069 return -1;
1070 }
1071 return 0;
1072}
1073
1074
1075int net_client_init(QemuOpts *opts, bool is_netdev, Error **errp)
1076{
1077 void *object = NULL;
1078 Error *err = NULL;
1079 int ret = -1;
1080 Visitor *v = opts_visitor_new(opts);
1081
1082 {
1083
1084 const char *ip6_net = qemu_opt_get(opts, "ipv6-net");
1085
1086 if (ip6_net) {
1087 char buf[strlen(ip6_net) + 1];
1088
1089 if (get_str_sep(buf, sizeof(buf), &ip6_net, '/') < 0) {
1090
1091 qemu_opt_set(opts, "ipv6-prefix", ip6_net, &error_abort);
1092 qemu_opt_set_number(opts, "ipv6-prefixlen", 64, &error_abort);
1093 } else {
1094
1095 unsigned long len;
1096 int err;
1097
1098 qemu_opt_set(opts, "ipv6-prefix", buf, &error_abort);
1099 err = qemu_strtoul(ip6_net, NULL, 10, &len);
1100
1101 if (err) {
1102 error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1103 "ipv6-prefix", "a number");
1104 } else {
1105 qemu_opt_set_number(opts, "ipv6-prefixlen", len,
1106 &error_abort);
1107 }
1108 }
1109 qemu_opt_unset(opts, "ipv6-net");
1110 }
1111 }
1112
1113 if (is_netdev) {
1114 visit_type_Netdev(v, NULL, (Netdev **)&object, &err);
1115 } else {
1116 visit_type_NetLegacy(v, NULL, (NetLegacy **)&object, &err);
1117 }
1118
1119 if (!err) {
1120 ret = net_client_init1(object, is_netdev, &err);
1121 }
1122
1123 if (is_netdev) {
1124 qapi_free_Netdev(object);
1125 } else {
1126 qapi_free_NetLegacy(object);
1127 }
1128
1129 error_propagate(errp, err);
1130 visit_free(v);
1131 return ret;
1132}
1133
1134
1135static int net_host_check_device(const char *device)
1136{
1137 int i;
1138 for (i = 0; host_net_devices[i]; i++) {
1139 if (!strncmp(host_net_devices[i], device,
1140 strlen(host_net_devices[i]))) {
1141 return 1;
1142 }
1143 }
1144
1145 return 0;
1146}
1147
1148void hmp_host_net_add(Monitor *mon, const QDict *qdict)
1149{
1150 const char *device = qdict_get_str(qdict, "device");
1151 const char *opts_str = qdict_get_try_str(qdict, "opts");
1152 Error *local_err = NULL;
1153 QemuOpts *opts;
1154 static bool warned;
1155
1156 if (!warned && !qtest_enabled()) {
1157 error_report("host_net_add is deprecated, use netdev_add instead");
1158 warned = true;
1159 }
1160
1161 if (!net_host_check_device(device)) {
1162 monitor_printf(mon, "invalid host network device %s\n", device);
1163 return;
1164 }
1165
1166 opts = qemu_opts_parse_noisily(qemu_find_opts("net"),
1167 opts_str ? opts_str : "", false);
1168 if (!opts) {
1169 return;
1170 }
1171
1172 qemu_opt_set(opts, "type", device, &error_abort);
1173
1174 net_client_init(opts, false, &local_err);
1175 if (local_err) {
1176 error_report_err(local_err);
1177 monitor_printf(mon, "adding host network device %s failed\n", device);
1178 }
1179}
1180
1181void hmp_host_net_remove(Monitor *mon, const QDict *qdict)
1182{
1183 NetClientState *nc;
1184 int vlan_id = qdict_get_int(qdict, "vlan_id");
1185 const char *device = qdict_get_str(qdict, "device");
1186 static bool warned;
1187
1188 if (!warned && !qtest_enabled()) {
1189 error_report("host_net_remove is deprecated, use netdev_del instead");
1190 warned = true;
1191 }
1192
1193 nc = net_hub_find_client_by_name(vlan_id, device);
1194 if (!nc) {
1195 error_report("Host network device '%s' on hub '%d' not found",
1196 device, vlan_id);
1197 return;
1198 }
1199 if (nc->info->type == NET_CLIENT_DRIVER_NIC) {
1200 error_report("invalid host network device '%s'", device);
1201 return;
1202 }
1203
1204 qemu_del_net_client(nc->peer);
1205 qemu_del_net_client(nc);
1206 qemu_opts_del(qemu_opts_find(qemu_find_opts("net"), device));
1207}
1208
1209void netdev_add(QemuOpts *opts, Error **errp)
1210{
1211 net_client_init(opts, true, errp);
1212}
1213
1214void qmp_netdev_add(QDict *qdict, QObject **ret, Error **errp)
1215{
1216 Error *local_err = NULL;
1217 QemuOptsList *opts_list;
1218 QemuOpts *opts;
1219
1220 opts_list = qemu_find_opts_err("netdev", &local_err);
1221 if (local_err) {
1222 goto out;
1223 }
1224
1225 opts = qemu_opts_from_qdict(opts_list, qdict, &local_err);
1226 if (local_err) {
1227 goto out;
1228 }
1229
1230 netdev_add(opts, &local_err);
1231 if (local_err) {
1232 qemu_opts_del(opts);
1233 goto out;
1234 }
1235
1236out:
1237 error_propagate(errp, local_err);
1238}
1239
1240void qmp_netdev_del(const char *id, Error **errp)
1241{
1242 NetClientState *nc;
1243 QemuOpts *opts;
1244
1245 nc = qemu_find_netdev(id);
1246 if (!nc) {
1247 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1248 "Device '%s' not found", id);
1249 return;
1250 }
1251
1252 opts = qemu_opts_find(qemu_find_opts_err("netdev", NULL), id);
1253 if (!opts) {
1254 error_setg(errp, "Device '%s' is not a netdev", id);
1255 return;
1256 }
1257
1258 qemu_del_net_client(nc);
1259 qemu_opts_del(opts);
1260}
1261
1262static void netfilter_print_info(Monitor *mon, NetFilterState *nf)
1263{
1264 char *str;
1265 ObjectProperty *prop;
1266 ObjectPropertyIterator iter;
1267 Visitor *v;
1268
1269
1270 object_property_iter_init(&iter, OBJECT(nf));
1271 while ((prop = object_property_iter_next(&iter))) {
1272 if (!strcmp(prop->name, "type")) {
1273 continue;
1274 }
1275 v = string_output_visitor_new(false, &str);
1276 object_property_get(OBJECT(nf), v, prop->name, NULL);
1277 visit_complete(v, &str);
1278 visit_free(v);
1279 monitor_printf(mon, ",%s=%s", prop->name, str);
1280 g_free(str);
1281 }
1282 monitor_printf(mon, "\n");
1283}
1284
1285void print_net_client(Monitor *mon, NetClientState *nc)
1286{
1287 NetFilterState *nf;
1288
1289 monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name,
1290 nc->queue_index,
1291 NetClientDriver_lookup[nc->info->type],
1292 nc->info_str);
1293 if (!QTAILQ_EMPTY(&nc->filters)) {
1294 monitor_printf(mon, "filters:\n");
1295 }
1296 QTAILQ_FOREACH(nf, &nc->filters, next) {
1297 char *path = object_get_canonical_path_component(OBJECT(nf));
1298
1299 monitor_printf(mon, " - %s: type=%s", path,
1300 object_get_typename(OBJECT(nf)));
1301 netfilter_print_info(mon, nf);
1302 g_free(path);
1303 }
1304}
1305
1306RxFilterInfoList *qmp_query_rx_filter(bool has_name, const char *name,
1307 Error **errp)
1308{
1309 NetClientState *nc;
1310 RxFilterInfoList *filter_list = NULL, *last_entry = NULL;
1311
1312 QTAILQ_FOREACH(nc, &net_clients, next) {
1313 RxFilterInfoList *entry;
1314 RxFilterInfo *info;
1315
1316 if (has_name && strcmp(nc->name, name) != 0) {
1317 continue;
1318 }
1319
1320
1321 if (nc->info->type != NET_CLIENT_DRIVER_NIC) {
1322 if (has_name) {
1323 error_setg(errp, "net client(%s) isn't a NIC", name);
1324 return NULL;
1325 }
1326 continue;
1327 }
1328
1329
1330
1331
1332 if (nc->queue_index != 0)
1333 continue;
1334
1335 if (nc->info->query_rx_filter) {
1336 info = nc->info->query_rx_filter(nc);
1337 entry = g_malloc0(sizeof(*entry));
1338 entry->value = info;
1339
1340 if (!filter_list) {
1341 filter_list = entry;
1342 } else {
1343 last_entry->next = entry;
1344 }
1345 last_entry = entry;
1346 } else if (has_name) {
1347 error_setg(errp, "net client(%s) doesn't support"
1348 " rx-filter querying", name);
1349 return NULL;
1350 }
1351
1352 if (has_name) {
1353 break;
1354 }
1355 }
1356
1357 if (filter_list == NULL && has_name) {
1358 error_setg(errp, "invalid net client name: %s", name);
1359 }
1360
1361 return filter_list;
1362}
1363
1364void hmp_info_network(Monitor *mon, const QDict *qdict)
1365{
1366 NetClientState *nc, *peer;
1367 NetClientDriver type;
1368
1369 net_hub_info(mon);
1370
1371 QTAILQ_FOREACH(nc, &net_clients, next) {
1372 peer = nc->peer;
1373 type = nc->info->type;
1374
1375
1376 if (net_hub_id_for_client(nc, NULL) == 0) {
1377 continue;
1378 }
1379
1380 if (!peer || type == NET_CLIENT_DRIVER_NIC) {
1381 print_net_client(mon, nc);
1382 }
1383 if (peer && type == NET_CLIENT_DRIVER_NIC) {
1384 monitor_printf(mon, " \\ ");
1385 print_net_client(mon, peer);
1386 }
1387 }
1388}
1389
1390void qmp_set_link(const char *name, bool up, Error **errp)
1391{
1392 NetClientState *ncs[MAX_QUEUE_NUM];
1393 NetClientState *nc;
1394 int queues, i;
1395
1396 queues = qemu_find_net_clients_except(name, ncs,
1397 NET_CLIENT_DRIVER__MAX,
1398 MAX_QUEUE_NUM);
1399
1400 if (queues == 0) {
1401 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1402 "Device '%s' not found", name);
1403 return;
1404 }
1405 nc = ncs[0];
1406
1407 for (i = 0; i < queues; i++) {
1408 ncs[i]->link_down = !up;
1409 }
1410
1411 if (nc->info->link_status_changed) {
1412 nc->info->link_status_changed(nc);
1413 }
1414
1415 if (nc->peer) {
1416
1417
1418
1419
1420
1421
1422
1423
1424 if (nc->peer->info->type == NET_CLIENT_DRIVER_NIC) {
1425 for (i = 0; i < queues; i++) {
1426 ncs[i]->peer->link_down = !up;
1427 }
1428 }
1429 if (nc->peer->info->link_status_changed) {
1430 nc->peer->info->link_status_changed(nc->peer);
1431 }
1432 }
1433}
1434
1435static void net_vm_change_state_handler(void *opaque, int running,
1436 RunState state)
1437{
1438 NetClientState *nc;
1439 NetClientState *tmp;
1440
1441 QTAILQ_FOREACH_SAFE(nc, &net_clients, next, tmp) {
1442 if (running) {
1443
1444 if (nc->peer && qemu_can_send_packet(nc)) {
1445 qemu_flush_queued_packets(nc->peer);
1446 }
1447 } else {
1448
1449
1450
1451 qemu_flush_or_purge_queued_packets(nc, true);
1452 }
1453 }
1454}
1455
1456void net_cleanup(void)
1457{
1458 NetClientState *nc;
1459
1460
1461
1462
1463 while (!QTAILQ_EMPTY(&net_clients)) {
1464 nc = QTAILQ_FIRST(&net_clients);
1465 if (nc->info->type == NET_CLIENT_DRIVER_NIC) {
1466 qemu_del_nic(qemu_get_nic(nc));
1467 } else {
1468 qemu_del_net_client(nc);
1469 }
1470 }
1471
1472 qemu_del_vm_change_state_handler(net_change_state_entry);
1473}
1474
1475void net_check_clients(void)
1476{
1477 NetClientState *nc;
1478 int i;
1479
1480 net_hub_check_clients();
1481
1482 QTAILQ_FOREACH(nc, &net_clients, next) {
1483 if (!nc->peer) {
1484 fprintf(stderr, "Warning: %s %s has no peer\n",
1485 nc->info->type == NET_CLIENT_DRIVER_NIC ?
1486 "nic" : "netdev", nc->name);
1487 }
1488 }
1489
1490
1491
1492
1493
1494 for (i = 0; i < MAX_NICS; i++) {
1495 NICInfo *nd = &nd_table[i];
1496 if (nd->used && !nd->instantiated) {
1497 fprintf(stderr, "Warning: requested NIC (%s, model %s) "
1498 "was not created (not supported by this machine?)\n",
1499 nd->name ? nd->name : "anonymous",
1500 nd->model ? nd->model : "unspecified");
1501 }
1502 }
1503}
1504
1505static int net_init_client(void *dummy, QemuOpts *opts, Error **errp)
1506{
1507 Error *local_err = NULL;
1508
1509 net_client_init(opts, false, &local_err);
1510 if (local_err) {
1511 error_report_err(local_err);
1512 return -1;
1513 }
1514
1515 return 0;
1516}
1517
1518static int net_init_netdev(void *dummy, QemuOpts *opts, Error **errp)
1519{
1520 Error *local_err = NULL;
1521 int ret;
1522
1523 ret = net_client_init(opts, true, &local_err);
1524 if (local_err) {
1525 error_report_err(local_err);
1526 return -1;
1527 }
1528
1529 return ret;
1530}
1531
1532int net_init_clients(void)
1533{
1534 QemuOptsList *net = qemu_find_opts("net");
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, NULL)) {
1543 return -1;
1544 }
1545
1546 if (qemu_opts_foreach(net, net_init_client, NULL, NULL)) {
1547 return -1;
1548 }
1549
1550 return 0;
1551}
1552
1553int net_client_parse(QemuOptsList *opts_list, const char *optarg)
1554{
1555#if defined(CONFIG_SLIRP)
1556 int ret;
1557 if (net_slirp_parse_legacy(opts_list, optarg, &ret)) {
1558 return ret;
1559 }
1560#endif
1561
1562 if (!qemu_opts_parse_noisily(opts_list, optarg, true)) {
1563 return -1;
1564 }
1565
1566 return 0;
1567}
1568
1569
1570
1571unsigned compute_mcast_idx(const uint8_t *ep)
1572{
1573 uint32_t crc;
1574 int carry, i, j;
1575 uint8_t b;
1576
1577 crc = 0xffffffff;
1578 for (i = 0; i < 6; i++) {
1579 b = *ep++;
1580 for (j = 0; j < 8; j++) {
1581 carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01);
1582 crc <<= 1;
1583 b >>= 1;
1584 if (carry) {
1585 crc = ((crc ^ POLYNOMIAL) | carry);
1586 }
1587 }
1588 }
1589 return crc >> 26;
1590}
1591
1592QemuOptsList qemu_netdev_opts = {
1593 .name = "netdev",
1594 .implied_opt_name = "type",
1595 .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head),
1596 .desc = {
1597
1598
1599
1600
1601 { }
1602 },
1603};
1604
1605QemuOptsList qemu_net_opts = {
1606 .name = "net",
1607 .implied_opt_name = "type",
1608 .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head),
1609 .desc = {
1610
1611
1612
1613
1614 { }
1615 },
1616};
1617
1618void net_socket_rs_init(SocketReadState *rs,
1619 SocketReadStateFinalize *finalize,
1620 bool vnet_hdr)
1621{
1622 rs->state = 0;
1623 rs->vnet_hdr = vnet_hdr;
1624 rs->index = 0;
1625 rs->packet_len = 0;
1626 rs->vnet_hdr_len = 0;
1627 memset(rs->buf, 0, sizeof(rs->buf));
1628 rs->finalize = finalize;
1629}
1630
1631
1632
1633
1634
1635
1636int net_fill_rstate(SocketReadState *rs, const uint8_t *buf, int size)
1637{
1638 unsigned int l;
1639
1640 while (size > 0) {
1641
1642
1643
1644
1645
1646 switch (rs->state) {
1647 case 0:
1648 l = 4 - rs->index;
1649 if (l > size) {
1650 l = size;
1651 }
1652 memcpy(rs->buf + rs->index, buf, l);
1653 buf += l;
1654 size -= l;
1655 rs->index += l;
1656 if (rs->index == 4) {
1657
1658 rs->packet_len = ntohl(*(uint32_t *)rs->buf);
1659 rs->index = 0;
1660 if (rs->vnet_hdr) {
1661 rs->state = 1;
1662 } else {
1663 rs->state = 2;
1664 rs->vnet_hdr_len = 0;
1665 }
1666 }
1667 break;
1668 case 1:
1669 l = 4 - rs->index;
1670 if (l > size) {
1671 l = size;
1672 }
1673 memcpy(rs->buf + rs->index, buf, l);
1674 buf += l;
1675 size -= l;
1676 rs->index += l;
1677 if (rs->index == 4) {
1678
1679 rs->vnet_hdr_len = ntohl(*(uint32_t *)rs->buf);
1680 rs->index = 0;
1681 rs->state = 2;
1682 }
1683 break;
1684 case 2:
1685 l = rs->packet_len - rs->index;
1686 if (l > size) {
1687 l = size;
1688 }
1689 if (rs->index + l <= sizeof(rs->buf)) {
1690 memcpy(rs->buf + rs->index, buf, l);
1691 } else {
1692 fprintf(stderr, "serious error: oversized packet received,"
1693 "connection terminated.\n");
1694 rs->index = rs->state = 0;
1695 return -1;
1696 }
1697
1698 rs->index += l;
1699 buf += l;
1700 size -= l;
1701 if (rs->index >= rs->packet_len) {
1702 rs->index = 0;
1703 rs->state = 0;
1704 assert(rs->finalize);
1705 rs->finalize(rs);
1706 }
1707 break;
1708 }
1709 }
1710
1711 assert(size == 0);
1712 return 0;
1713}
1714