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25#include "qemu/osdep.h"
26
27#include "net/net.h"
28#include "clients.h"
29#include "hub.h"
30#include "net/slirp.h"
31#include "net/eth.h"
32#include "util.h"
33
34#include "monitor/monitor.h"
35#include "qemu/help_option.h"
36#include "qapi/qapi-commands-net.h"
37#include "qapi/qapi-visit-net.h"
38#include "qapi/qmp/qdict.h"
39#include "qapi/qmp/qerror.h"
40#include "qemu/error-report.h"
41#include "qemu/sockets.h"
42#include "qemu/cutils.h"
43#include "qemu/config-file.h"
44#include "hw/qdev.h"
45#include "qemu/iov.h"
46#include "qemu/main-loop.h"
47#include "qemu/option.h"
48#include "qapi/error.h"
49#include "qapi/opts-visitor.h"
50#include "sysemu/sysemu.h"
51#include "sysemu/qtest.h"
52#include "net/filter.h"
53#include "qapi/string-output-visitor.h"
54
55
56#if !defined(_WIN32)
57# define CONFIG_NET_BRIDGE
58#endif
59
60static VMChangeStateEntry *net_change_state_entry;
61static QTAILQ_HEAD(, NetClientState) net_clients;
62
63
64
65
66static int get_str_sep(char *buf, int buf_size, const char **pp, int sep)
67{
68 const char *p, *p1;
69 int len;
70 p = *pp;
71 p1 = strchr(p, sep);
72 if (!p1)
73 return -1;
74 len = p1 - p;
75 p1++;
76 if (buf_size > 0) {
77 if (len > buf_size - 1)
78 len = buf_size - 1;
79 memcpy(buf, p, len);
80 buf[len] = '\0';
81 }
82 *pp = p1;
83 return 0;
84}
85
86int parse_host_port(struct sockaddr_in *saddr, const char *str,
87 Error **errp)
88{
89 char buf[512];
90 struct hostent *he;
91 const char *p, *r;
92 int port;
93
94 p = str;
95 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
96 error_setg(errp, "host address '%s' doesn't contain ':' "
97 "separating host from port", str);
98 return -1;
99 }
100 saddr->sin_family = AF_INET;
101 if (buf[0] == '\0') {
102 saddr->sin_addr.s_addr = 0;
103 } else {
104 if (qemu_isdigit(buf[0])) {
105 if (!inet_aton(buf, &saddr->sin_addr)) {
106 error_setg(errp, "host address '%s' is not a valid "
107 "IPv4 address", buf);
108 return -1;
109 }
110 } else {
111 he = gethostbyname(buf);
112 if (he == NULL) {
113 error_setg(errp, "can't resolve host address '%s'", buf);
114 return - 1;
115 }
116 saddr->sin_addr = *(struct in_addr *)he->h_addr;
117 }
118 }
119 port = strtol(p, (char **)&r, 0);
120 if (r == p) {
121 error_setg(errp, "port number '%s' is invalid", p);
122 return -1;
123 }
124 saddr->sin_port = htons(port);
125 return 0;
126}
127
128char *qemu_mac_strdup_printf(const uint8_t *macaddr)
129{
130 return g_strdup_printf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x",
131 macaddr[0], macaddr[1], macaddr[2],
132 macaddr[3], macaddr[4], macaddr[5]);
133}
134
135void qemu_format_nic_info_str(NetClientState *nc, uint8_t macaddr[6])
136{
137 snprintf(nc->info_str, sizeof(nc->info_str),
138 "model=%s,macaddr=%02x:%02x:%02x:%02x:%02x:%02x",
139 nc->model,
140 macaddr[0], macaddr[1], macaddr[2],
141 macaddr[3], macaddr[4], macaddr[5]);
142}
143
144static int mac_table[256] = {0};
145
146static void qemu_macaddr_set_used(MACAddr *macaddr)
147{
148 int index;
149
150 for (index = 0x56; index < 0xFF; index++) {
151 if (macaddr->a[5] == index) {
152 mac_table[index]++;
153 }
154 }
155}
156
157static void qemu_macaddr_set_free(MACAddr *macaddr)
158{
159 int index;
160 static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } };
161
162 if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) {
163 return;
164 }
165 for (index = 0x56; index < 0xFF; index++) {
166 if (macaddr->a[5] == index) {
167 mac_table[index]--;
168 }
169 }
170}
171
172static int qemu_macaddr_get_free(void)
173{
174 int index;
175
176 for (index = 0x56; index < 0xFF; index++) {
177 if (mac_table[index] == 0) {
178 return index;
179 }
180 }
181
182 return -1;
183}
184
185void qemu_macaddr_default_if_unset(MACAddr *macaddr)
186{
187 static const MACAddr zero = { .a = { 0,0,0,0,0,0 } };
188 static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } };
189
190 if (memcmp(macaddr, &zero, sizeof(zero)) != 0) {
191 if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) {
192 return;
193 } else {
194 qemu_macaddr_set_used(macaddr);
195 return;
196 }
197 }
198
199 macaddr->a[0] = 0x52;
200 macaddr->a[1] = 0x54;
201 macaddr->a[2] = 0x00;
202 macaddr->a[3] = 0x12;
203 macaddr->a[4] = 0x34;
204 macaddr->a[5] = qemu_macaddr_get_free();
205 qemu_macaddr_set_used(macaddr);
206}
207
208
209
210
211
212
213static char *assign_name(NetClientState *nc1, const char *model)
214{
215 NetClientState *nc;
216 int id = 0;
217
218 QTAILQ_FOREACH(nc, &net_clients, next) {
219 if (nc == nc1) {
220 continue;
221 }
222 if (strcmp(nc->model, model) == 0) {
223 id++;
224 }
225 }
226
227 return g_strdup_printf("%s.%d", model, id);
228}
229
230static void qemu_net_client_destructor(NetClientState *nc)
231{
232 g_free(nc);
233}
234static ssize_t qemu_deliver_packet_iov(NetClientState *sender,
235 unsigned flags,
236 const struct iovec *iov,
237 int iovcnt,
238 void *opaque);
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
603void qemu_flush_or_purge_queued_packets(NetClientState *nc, bool purge)
604{
605 nc->receive_disabled = 0;
606
607 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_HUBPORT) {
608 if (net_hub_flush(nc->peer)) {
609 qemu_notify_event();
610 }
611 }
612 if (qemu_net_queue_flush(nc->incoming_queue)) {
613
614
615
616 qemu_notify_event();
617 } else if (purge) {
618
619 qemu_net_queue_purge(nc->incoming_queue, nc);
620 }
621}
622
623void qemu_flush_queued_packets(NetClientState *nc)
624{
625 qemu_flush_or_purge_queued_packets(nc, false);
626}
627
628static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender,
629 unsigned flags,
630 const uint8_t *buf, int size,
631 NetPacketSent *sent_cb)
632{
633 NetQueue *queue;
634 int ret;
635
636#ifdef DEBUG_NET
637 printf("qemu_send_packet_async:\n");
638 qemu_hexdump((const char *)buf, stdout, "net", size);
639#endif
640
641 if (sender->link_down || !sender->peer) {
642 return size;
643 }
644
645
646 ret = filter_receive(sender, NET_FILTER_DIRECTION_TX,
647 sender, flags, buf, size, sent_cb);
648 if (ret) {
649 return ret;
650 }
651
652 ret = filter_receive(sender->peer, NET_FILTER_DIRECTION_RX,
653 sender, flags, buf, size, sent_cb);
654 if (ret) {
655 return ret;
656 }
657
658 queue = sender->peer->incoming_queue;
659
660 return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb);
661}
662
663ssize_t qemu_send_packet_async(NetClientState *sender,
664 const uint8_t *buf, int size,
665 NetPacketSent *sent_cb)
666{
667 return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE,
668 buf, size, sent_cb);
669}
670
671void qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size)
672{
673 qemu_send_packet_async(nc, buf, size, NULL);
674}
675
676ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size)
677{
678 return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW,
679 buf, size, NULL);
680}
681
682static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov,
683 int iovcnt, unsigned flags)
684{
685 uint8_t *buf = NULL;
686 uint8_t *buffer;
687 size_t offset;
688 ssize_t ret;
689
690 if (iovcnt == 1) {
691 buffer = iov[0].iov_base;
692 offset = iov[0].iov_len;
693 } else {
694 offset = iov_size(iov, iovcnt);
695 if (offset > NET_BUFSIZE) {
696 return -1;
697 }
698 buf = g_malloc(offset);
699 buffer = buf;
700 offset = iov_to_buf(iov, iovcnt, 0, buf, offset);
701 }
702
703 if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) {
704 ret = nc->info->receive_raw(nc, buffer, offset);
705 } else {
706 ret = nc->info->receive(nc, buffer, offset);
707 }
708
709 g_free(buf);
710 return ret;
711}
712
713static ssize_t qemu_deliver_packet_iov(NetClientState *sender,
714 unsigned flags,
715 const struct iovec *iov,
716 int iovcnt,
717 void *opaque)
718{
719 NetClientState *nc = opaque;
720 int ret;
721
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 size_t size = iov_size(iov, iovcnt);
750 int ret;
751
752 if (size > NET_BUFSIZE) {
753 return size;
754 }
755
756 if (sender->link_down || !sender->peer) {
757 return size;
758 }
759
760
761 ret = filter_receive_iov(sender, NET_FILTER_DIRECTION_TX, sender,
762 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb);
763 if (ret) {
764 return ret;
765 }
766
767 ret = filter_receive_iov(sender->peer, NET_FILTER_DIRECTION_RX, sender,
768 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb);
769 if (ret) {
770 return ret;
771 }
772
773 queue = sender->peer->incoming_queue;
774
775 return qemu_net_queue_send_iov(queue, sender,
776 QEMU_NET_PACKET_FLAG_NONE,
777 iov, iovcnt, sent_cb);
778}
779
780ssize_t
781qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt)
782{
783 return qemu_sendv_packet_async(nc, iov, iovcnt, NULL);
784}
785
786NetClientState *qemu_find_netdev(const char *id)
787{
788 NetClientState *nc;
789
790 QTAILQ_FOREACH(nc, &net_clients, next) {
791 if (nc->info->type == NET_CLIENT_DRIVER_NIC)
792 continue;
793 if (!strcmp(nc->name, id)) {
794 return nc;
795 }
796 }
797
798 return NULL;
799}
800
801int qemu_find_net_clients_except(const char *id, NetClientState **ncs,
802 NetClientDriver type, int max)
803{
804 NetClientState *nc;
805 int ret = 0;
806
807 QTAILQ_FOREACH(nc, &net_clients, next) {
808 if (nc->info->type == type) {
809 continue;
810 }
811 if (!id || !strcmp(nc->name, id)) {
812 if (ret < max) {
813 ncs[ret] = nc;
814 }
815 ret++;
816 }
817 }
818
819 return ret;
820}
821
822static int nic_get_free_idx(void)
823{
824 int index;
825
826 for (index = 0; index < MAX_NICS; index++)
827 if (!nd_table[index].used)
828 return index;
829 return -1;
830}
831
832int qemu_show_nic_models(const char *arg, const char *const *models)
833{
834 int i;
835
836 if (!arg || !is_help_option(arg)) {
837 return 0;
838 }
839
840 fprintf(stderr, "qemu: Supported NIC models: ");
841 for (i = 0 ; models[i]; i++)
842 fprintf(stderr, "%s%c", models[i], models[i+1] ? ',' : '\n');
843 return 1;
844}
845
846void qemu_check_nic_model(NICInfo *nd, const char *model)
847{
848 const char *models[2];
849
850 models[0] = model;
851 models[1] = NULL;
852
853 if (qemu_show_nic_models(nd->model, models))
854 exit(0);
855 if (qemu_find_nic_model(nd, models, model) < 0)
856 exit(1);
857}
858
859int qemu_find_nic_model(NICInfo *nd, const char * const *models,
860 const char *default_model)
861{
862 int i;
863
864 if (!nd->model)
865 nd->model = g_strdup(default_model);
866
867 for (i = 0 ; models[i]; i++) {
868 if (strcmp(nd->model, models[i]) == 0)
869 return i;
870 }
871
872 error_report("Unsupported NIC model: %s", nd->model);
873 return -1;
874}
875
876static int net_init_nic(const Netdev *netdev, const char *name,
877 NetClientState *peer, Error **errp)
878{
879 int idx;
880 NICInfo *nd;
881 const NetLegacyNicOptions *nic;
882
883 assert(netdev->type == NET_CLIENT_DRIVER_NIC);
884 nic = &netdev->u.nic;
885
886 idx = nic_get_free_idx();
887 if (idx == -1 || nb_nics >= MAX_NICS) {
888 error_setg(errp, "too many NICs");
889 return -1;
890 }
891
892 nd = &nd_table[idx];
893
894 memset(nd, 0, sizeof(*nd));
895
896 if (nic->has_netdev) {
897 nd->netdev = qemu_find_netdev(nic->netdev);
898 if (!nd->netdev) {
899 error_setg(errp, "netdev '%s' not found", nic->netdev);
900 return -1;
901 }
902 } else {
903 assert(peer);
904 nd->netdev = peer;
905 }
906 nd->name = g_strdup(name);
907 if (nic->has_model) {
908 nd->model = g_strdup(nic->model);
909 }
910 if (nic->has_addr) {
911 nd->devaddr = g_strdup(nic->addr);
912 }
913
914 if (nic->has_macaddr &&
915 net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) {
916 error_setg(errp, "invalid syntax for ethernet address");
917 return -1;
918 }
919 if (nic->has_macaddr &&
920 is_multicast_ether_addr(nd->macaddr.a)) {
921 error_setg(errp,
922 "NIC cannot have multicast MAC address (odd 1st byte)");
923 return -1;
924 }
925 qemu_macaddr_default_if_unset(&nd->macaddr);
926
927 if (nic->has_vectors) {
928 if (nic->vectors > 0x7ffffff) {
929 error_setg(errp, "invalid # of vectors: %"PRIu32, nic->vectors);
930 return -1;
931 }
932 nd->nvectors = nic->vectors;
933 } else {
934 nd->nvectors = DEV_NVECTORS_UNSPECIFIED;
935 }
936
937 nd->used = 1;
938 nb_nics++;
939
940 return idx;
941}
942
943
944static int (* const net_client_init_fun[NET_CLIENT_DRIVER__MAX])(
945 const Netdev *netdev,
946 const char *name,
947 NetClientState *peer, Error **errp) = {
948 [NET_CLIENT_DRIVER_NIC] = net_init_nic,
949#ifdef CONFIG_SLIRP
950 [NET_CLIENT_DRIVER_USER] = net_init_slirp,
951#endif
952 [NET_CLIENT_DRIVER_TAP] = net_init_tap,
953 [NET_CLIENT_DRIVER_SOCKET] = net_init_socket,
954#ifdef CONFIG_VDE
955 [NET_CLIENT_DRIVER_VDE] = net_init_vde,
956#endif
957#ifdef CONFIG_NETMAP
958 [NET_CLIENT_DRIVER_NETMAP] = net_init_netmap,
959#endif
960#ifdef CONFIG_NET_BRIDGE
961 [NET_CLIENT_DRIVER_BRIDGE] = net_init_bridge,
962#endif
963 [NET_CLIENT_DRIVER_HUBPORT] = net_init_hubport,
964#ifdef CONFIG_VHOST_NET_USED
965 [NET_CLIENT_DRIVER_VHOST_USER] = net_init_vhost_user,
966#endif
967#ifdef CONFIG_L2TPV3
968 [NET_CLIENT_DRIVER_L2TPV3] = net_init_l2tpv3,
969#endif
970};
971
972
973static int net_client_init1(const void *object, bool is_netdev, Error **errp)
974{
975 Netdev legacy = {0};
976 const Netdev *netdev;
977 const char *name;
978 NetClientState *peer = NULL;
979
980 if (is_netdev) {
981 netdev = object;
982 name = netdev->id;
983
984 if (netdev->type == NET_CLIENT_DRIVER_NIC ||
985 !net_client_init_fun[netdev->type]) {
986 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
987 "a netdev backend type");
988 return -1;
989 }
990 } else {
991 const NetLegacy *net = object;
992 const NetLegacyOptions *opts = net->opts;
993 legacy.id = net->id;
994 netdev = &legacy;
995
996 name = net->has_id ? net->id : net->name;
997
998
999 switch (opts->type) {
1000 case NET_LEGACY_OPTIONS_TYPE_NONE:
1001 return 0;
1002 case NET_LEGACY_OPTIONS_TYPE_NIC:
1003 legacy.type = NET_CLIENT_DRIVER_NIC;
1004 legacy.u.nic = opts->u.nic;
1005 break;
1006 case NET_LEGACY_OPTIONS_TYPE_USER:
1007 legacy.type = NET_CLIENT_DRIVER_USER;
1008 legacy.u.user = opts->u.user;
1009 break;
1010 case NET_LEGACY_OPTIONS_TYPE_TAP:
1011 legacy.type = NET_CLIENT_DRIVER_TAP;
1012 legacy.u.tap = opts->u.tap;
1013 break;
1014 case NET_LEGACY_OPTIONS_TYPE_L2TPV3:
1015 legacy.type = NET_CLIENT_DRIVER_L2TPV3;
1016 legacy.u.l2tpv3 = opts->u.l2tpv3;
1017 break;
1018 case NET_LEGACY_OPTIONS_TYPE_SOCKET:
1019 legacy.type = NET_CLIENT_DRIVER_SOCKET;
1020 legacy.u.socket = opts->u.socket;
1021 break;
1022 case NET_LEGACY_OPTIONS_TYPE_VDE:
1023 legacy.type = NET_CLIENT_DRIVER_VDE;
1024 legacy.u.vde = opts->u.vde;
1025 break;
1026 case NET_LEGACY_OPTIONS_TYPE_BRIDGE:
1027 legacy.type = NET_CLIENT_DRIVER_BRIDGE;
1028 legacy.u.bridge = opts->u.bridge;
1029 break;
1030 case NET_LEGACY_OPTIONS_TYPE_NETMAP:
1031 legacy.type = NET_CLIENT_DRIVER_NETMAP;
1032 legacy.u.netmap = opts->u.netmap;
1033 break;
1034 case NET_LEGACY_OPTIONS_TYPE_VHOST_USER:
1035 legacy.type = NET_CLIENT_DRIVER_VHOST_USER;
1036 legacy.u.vhost_user = opts->u.vhost_user;
1037 break;
1038 default:
1039 abort();
1040 }
1041
1042 if (!net_client_init_fun[netdev->type]) {
1043 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
1044 "a net backend type (maybe it is not compiled "
1045 "into this binary)");
1046 return -1;
1047 }
1048
1049
1050 if (netdev->type != NET_CLIENT_DRIVER_NIC ||
1051 !opts->u.nic.has_netdev) {
1052 peer = net_hub_add_port(0, NULL, NULL);
1053 }
1054 }
1055
1056 if (net_client_init_fun[netdev->type](netdev, name, peer, errp) < 0) {
1057
1058 if (errp && !*errp) {
1059 error_setg(errp, QERR_DEVICE_INIT_FAILED,
1060 NetClientDriver_str(netdev->type));
1061 }
1062 return -1;
1063 }
1064 return 0;
1065}
1066
1067static void show_netdevs(void)
1068{
1069 int idx;
1070 const char *available_netdevs[] = {
1071 "socket",
1072 "hubport",
1073 "tap",
1074#ifdef CONFIG_SLIRP
1075 "user",
1076#endif
1077#ifdef CONFIG_L2TPV3
1078 "l2tpv3",
1079#endif
1080#ifdef CONFIG_VDE
1081 "vde",
1082#endif
1083#ifdef CONFIG_NET_BRIDGE
1084 "bridge",
1085#endif
1086#ifdef CONFIG_NETMAP
1087 "netmap",
1088#endif
1089#ifdef CONFIG_POSIX
1090 "vhost-user",
1091#endif
1092 };
1093
1094 printf("Available netdev backend types:\n");
1095 for (idx = 0; idx < ARRAY_SIZE(available_netdevs); idx++) {
1096 puts(available_netdevs[idx]);
1097 }
1098}
1099
1100static int net_client_init(QemuOpts *opts, bool is_netdev, Error **errp)
1101{
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
1114 const char *ip6_net = qemu_opt_get(opts, "ipv6-net");
1115
1116 if (ip6_net) {
1117 char buf[strlen(ip6_net) + 1];
1118
1119 if (get_str_sep(buf, sizeof(buf), &ip6_net, '/') < 0) {
1120
1121 qemu_opt_set(opts, "ipv6-prefix", ip6_net, &error_abort);
1122 qemu_opt_set_number(opts, "ipv6-prefixlen", 64, &error_abort);
1123 } else {
1124
1125 unsigned long len;
1126 int err;
1127
1128 qemu_opt_set(opts, "ipv6-prefix", buf, &error_abort);
1129 err = qemu_strtoul(ip6_net, NULL, 10, &len);
1130
1131 if (err) {
1132 error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1133 "ipv6-prefix", "a number");
1134 } else {
1135 qemu_opt_set_number(opts, "ipv6-prefixlen", len,
1136 &error_abort);
1137 }
1138 }
1139 qemu_opt_unset(opts, "ipv6-net");
1140 }
1141 }
1142
1143 if (is_netdev) {
1144 visit_type_Netdev(v, NULL, (Netdev **)&object, &err);
1145 } else {
1146 visit_type_NetLegacy(v, NULL, (NetLegacy **)&object, &err);
1147 }
1148
1149 if (!err) {
1150 ret = net_client_init1(object, is_netdev, &err);
1151 }
1152
1153 if (is_netdev) {
1154 qapi_free_Netdev(object);
1155 } else {
1156 qapi_free_NetLegacy(object);
1157 }
1158
1159 error_propagate(errp, err);
1160 visit_free(v);
1161 return ret;
1162}
1163
1164void netdev_add(QemuOpts *opts, Error **errp)
1165{
1166 net_client_init(opts, true, errp);
1167}
1168
1169void qmp_netdev_add(QDict *qdict, QObject **ret, Error **errp)
1170{
1171 Error *local_err = NULL;
1172 QemuOptsList *opts_list;
1173 QemuOpts *opts;
1174
1175 opts_list = qemu_find_opts_err("netdev", &local_err);
1176 if (local_err) {
1177 goto out;
1178 }
1179
1180 opts = qemu_opts_from_qdict(opts_list, qdict, &local_err);
1181 if (local_err) {
1182 goto out;
1183 }
1184
1185 netdev_add(opts, &local_err);
1186 if (local_err) {
1187 qemu_opts_del(opts);
1188 goto out;
1189 }
1190
1191out:
1192 error_propagate(errp, local_err);
1193}
1194
1195void qmp_netdev_del(const char *id, Error **errp)
1196{
1197 NetClientState *nc;
1198 QemuOpts *opts;
1199
1200 nc = qemu_find_netdev(id);
1201 if (!nc) {
1202 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1203 "Device '%s' not found", id);
1204 return;
1205 }
1206
1207 opts = qemu_opts_find(qemu_find_opts_err("netdev", NULL), id);
1208 if (!opts) {
1209 error_setg(errp, "Device '%s' is not a netdev", id);
1210 return;
1211 }
1212
1213 qemu_del_net_client(nc);
1214 qemu_opts_del(opts);
1215}
1216
1217static void netfilter_print_info(Monitor *mon, NetFilterState *nf)
1218{
1219 char *str;
1220 ObjectProperty *prop;
1221 ObjectPropertyIterator iter;
1222 Visitor *v;
1223
1224
1225 object_property_iter_init(&iter, OBJECT(nf));
1226 while ((prop = object_property_iter_next(&iter))) {
1227 if (!strcmp(prop->name, "type")) {
1228 continue;
1229 }
1230 v = string_output_visitor_new(false, &str);
1231 object_property_get(OBJECT(nf), v, prop->name, NULL);
1232 visit_complete(v, &str);
1233 visit_free(v);
1234 monitor_printf(mon, ",%s=%s", prop->name, str);
1235 g_free(str);
1236 }
1237 monitor_printf(mon, "\n");
1238}
1239
1240void print_net_client(Monitor *mon, NetClientState *nc)
1241{
1242 NetFilterState *nf;
1243
1244 monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name,
1245 nc->queue_index,
1246 NetClientDriver_str(nc->info->type),
1247 nc->info_str);
1248 if (!QTAILQ_EMPTY(&nc->filters)) {
1249 monitor_printf(mon, "filters:\n");
1250 }
1251 QTAILQ_FOREACH(nf, &nc->filters, next) {
1252 char *path = object_get_canonical_path_component(OBJECT(nf));
1253
1254 monitor_printf(mon, " - %s: type=%s", path,
1255 object_get_typename(OBJECT(nf)));
1256 netfilter_print_info(mon, nf);
1257 g_free(path);
1258 }
1259}
1260
1261RxFilterInfoList *qmp_query_rx_filter(bool has_name, const char *name,
1262 Error **errp)
1263{
1264 NetClientState *nc;
1265 RxFilterInfoList *filter_list = NULL, *last_entry = NULL;
1266
1267 QTAILQ_FOREACH(nc, &net_clients, next) {
1268 RxFilterInfoList *entry;
1269 RxFilterInfo *info;
1270
1271 if (has_name && strcmp(nc->name, name) != 0) {
1272 continue;
1273 }
1274
1275
1276 if (nc->info->type != NET_CLIENT_DRIVER_NIC) {
1277 if (has_name) {
1278 error_setg(errp, "net client(%s) isn't a NIC", name);
1279 return NULL;
1280 }
1281 continue;
1282 }
1283
1284
1285
1286
1287 if (nc->queue_index != 0)
1288 continue;
1289
1290 if (nc->info->query_rx_filter) {
1291 info = nc->info->query_rx_filter(nc);
1292 entry = g_malloc0(sizeof(*entry));
1293 entry->value = info;
1294
1295 if (!filter_list) {
1296 filter_list = entry;
1297 } else {
1298 last_entry->next = entry;
1299 }
1300 last_entry = entry;
1301 } else if (has_name) {
1302 error_setg(errp, "net client(%s) doesn't support"
1303 " rx-filter querying", name);
1304 return NULL;
1305 }
1306
1307 if (has_name) {
1308 break;
1309 }
1310 }
1311
1312 if (filter_list == NULL && has_name) {
1313 error_setg(errp, "invalid net client name: %s", name);
1314 }
1315
1316 return filter_list;
1317}
1318
1319void hmp_info_network(Monitor *mon, const QDict *qdict)
1320{
1321 NetClientState *nc, *peer;
1322 NetClientDriver type;
1323
1324 net_hub_info(mon);
1325
1326 QTAILQ_FOREACH(nc, &net_clients, next) {
1327 peer = nc->peer;
1328 type = nc->info->type;
1329
1330
1331 if (net_hub_id_for_client(nc, NULL) == 0) {
1332 continue;
1333 }
1334
1335 if (!peer || type == NET_CLIENT_DRIVER_NIC) {
1336 print_net_client(mon, nc);
1337 }
1338 if (peer && type == NET_CLIENT_DRIVER_NIC) {
1339 monitor_printf(mon, " \\ ");
1340 print_net_client(mon, peer);
1341 }
1342 }
1343}
1344
1345void qmp_set_link(const char *name, bool up, Error **errp)
1346{
1347 NetClientState *ncs[MAX_QUEUE_NUM];
1348 NetClientState *nc;
1349 int queues, i;
1350
1351 queues = qemu_find_net_clients_except(name, ncs,
1352 NET_CLIENT_DRIVER__MAX,
1353 MAX_QUEUE_NUM);
1354
1355 if (queues == 0) {
1356 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1357 "Device '%s' not found", name);
1358 return;
1359 }
1360 nc = ncs[0];
1361
1362 for (i = 0; i < queues; i++) {
1363 ncs[i]->link_down = !up;
1364 }
1365
1366 if (nc->info->link_status_changed) {
1367 nc->info->link_status_changed(nc);
1368 }
1369
1370 if (nc->peer) {
1371
1372
1373
1374
1375
1376
1377
1378
1379 if (nc->peer->info->type == NET_CLIENT_DRIVER_NIC) {
1380 for (i = 0; i < queues; i++) {
1381 ncs[i]->peer->link_down = !up;
1382 }
1383 }
1384 if (nc->peer->info->link_status_changed) {
1385 nc->peer->info->link_status_changed(nc->peer);
1386 }
1387 }
1388}
1389
1390static void net_vm_change_state_handler(void *opaque, int running,
1391 RunState state)
1392{
1393 NetClientState *nc;
1394 NetClientState *tmp;
1395
1396 QTAILQ_FOREACH_SAFE(nc, &net_clients, next, tmp) {
1397 if (running) {
1398
1399 if (nc->peer && qemu_can_send_packet(nc)) {
1400 qemu_flush_queued_packets(nc->peer);
1401 }
1402 } else {
1403
1404
1405
1406 qemu_flush_or_purge_queued_packets(nc, true);
1407 }
1408 }
1409}
1410
1411void net_cleanup(void)
1412{
1413 NetClientState *nc;
1414
1415
1416
1417
1418 while (!QTAILQ_EMPTY(&net_clients)) {
1419 nc = QTAILQ_FIRST(&net_clients);
1420 if (nc->info->type == NET_CLIENT_DRIVER_NIC) {
1421 qemu_del_nic(qemu_get_nic(nc));
1422 } else {
1423 qemu_del_net_client(nc);
1424 }
1425 }
1426
1427 qemu_del_vm_change_state_handler(net_change_state_entry);
1428}
1429
1430void net_check_clients(void)
1431{
1432 NetClientState *nc;
1433 int i;
1434
1435 net_hub_check_clients();
1436
1437 QTAILQ_FOREACH(nc, &net_clients, next) {
1438 if (!nc->peer) {
1439 warn_report("%s %s has no peer",
1440 nc->info->type == NET_CLIENT_DRIVER_NIC
1441 ? "nic" : "netdev",
1442 nc->name);
1443 }
1444 }
1445
1446
1447
1448
1449
1450 for (i = 0; i < MAX_NICS; i++) {
1451 NICInfo *nd = &nd_table[i];
1452 if (nd->used && !nd->instantiated) {
1453 warn_report("requested NIC (%s, model %s) "
1454 "was not created (not supported by this machine?)",
1455 nd->name ? nd->name : "anonymous",
1456 nd->model ? nd->model : "unspecified");
1457 }
1458 }
1459}
1460
1461static int net_init_client(void *dummy, QemuOpts *opts, Error **errp)
1462{
1463 return net_client_init(opts, false, errp);
1464}
1465
1466static int net_init_netdev(void *dummy, QemuOpts *opts, Error **errp)
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 = g_strdup_printf("__org.qemu.nic%i\n", idx);
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