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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}
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
329static void qemu_cleanup_net_client(NetClientState *nc)
330{
331 QTAILQ_REMOVE(&net_clients, nc, next);
332
333 if (nc->info->cleanup) {
334 nc->info->cleanup(nc);
335 }
336}
337
338static void qemu_free_net_client(NetClientState *nc)
339{
340 if (nc->incoming_queue) {
341 qemu_del_net_queue(nc->incoming_queue);
342 }
343 if (nc->peer) {
344 nc->peer->peer = NULL;
345 }
346 g_free(nc->name);
347 g_free(nc->model);
348 if (nc->destructor) {
349 nc->destructor(nc);
350 }
351}
352
353void qemu_del_net_client(NetClientState *nc)
354{
355 NetClientState *ncs[MAX_QUEUE_NUM];
356 int queues, i;
357 NetFilterState *nf, *next;
358
359 assert(nc->info->type != NET_CLIENT_DRIVER_NIC);
360
361
362
363
364 queues = qemu_find_net_clients_except(nc->name, ncs,
365 NET_CLIENT_DRIVER_NIC,
366 MAX_QUEUE_NUM);
367 assert(queues != 0);
368
369 QTAILQ_FOREACH_SAFE(nf, &nc->filters, next, next) {
370 object_unparent(OBJECT(nf));
371 }
372
373
374 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_NIC) {
375 NICState *nic = qemu_get_nic(nc->peer);
376 if (nic->peer_deleted) {
377 return;
378 }
379 nic->peer_deleted = true;
380
381 for (i = 0; i < queues; i++) {
382 ncs[i]->peer->link_down = true;
383 }
384
385 if (nc->peer->info->link_status_changed) {
386 nc->peer->info->link_status_changed(nc->peer);
387 }
388
389 for (i = 0; i < queues; i++) {
390 qemu_cleanup_net_client(ncs[i]);
391 }
392
393 return;
394 }
395
396 for (i = 0; i < queues; i++) {
397 qemu_cleanup_net_client(ncs[i]);
398 qemu_free_net_client(ncs[i]);
399 }
400}
401
402void qemu_del_nic(NICState *nic)
403{
404 int i, queues = MAX(nic->conf->peers.queues, 1);
405
406 qemu_macaddr_set_free(&nic->conf->macaddr);
407
408
409 if (nic->peer_deleted) {
410 for (i = 0; i < queues; i++) {
411 qemu_free_net_client(qemu_get_subqueue(nic, i)->peer);
412 }
413 }
414
415 for (i = queues - 1; i >= 0; i--) {
416 NetClientState *nc = qemu_get_subqueue(nic, i);
417
418 qemu_cleanup_net_client(nc);
419 qemu_free_net_client(nc);
420 }
421
422 g_free(nic);
423}
424
425void qemu_foreach_nic(qemu_nic_foreach func, void *opaque)
426{
427 NetClientState *nc;
428
429 QTAILQ_FOREACH(nc, &net_clients, next) {
430 if (nc->info->type == NET_CLIENT_DRIVER_NIC) {
431 if (nc->queue_index == 0) {
432 func(qemu_get_nic(nc), opaque);
433 }
434 }
435 }
436}
437
438bool qemu_has_ufo(NetClientState *nc)
439{
440 if (!nc || !nc->info->has_ufo) {
441 return false;
442 }
443
444 return nc->info->has_ufo(nc);
445}
446
447bool qemu_has_vnet_hdr(NetClientState *nc)
448{
449 if (!nc || !nc->info->has_vnet_hdr) {
450 return false;
451 }
452
453 return nc->info->has_vnet_hdr(nc);
454}
455
456bool qemu_has_vnet_hdr_len(NetClientState *nc, int len)
457{
458 if (!nc || !nc->info->has_vnet_hdr_len) {
459 return false;
460 }
461
462 return nc->info->has_vnet_hdr_len(nc, len);
463}
464
465void qemu_using_vnet_hdr(NetClientState *nc, bool enable)
466{
467 if (!nc || !nc->info->using_vnet_hdr) {
468 return;
469 }
470
471 nc->info->using_vnet_hdr(nc, enable);
472}
473
474void qemu_set_offload(NetClientState *nc, int csum, int tso4, int tso6,
475 int ecn, int ufo)
476{
477 if (!nc || !nc->info->set_offload) {
478 return;
479 }
480
481 nc->info->set_offload(nc, csum, tso4, tso6, ecn, ufo);
482}
483
484void qemu_set_vnet_hdr_len(NetClientState *nc, int len)
485{
486 if (!nc || !nc->info->set_vnet_hdr_len) {
487 return;
488 }
489
490 nc->vnet_hdr_len = len;
491 nc->info->set_vnet_hdr_len(nc, len);
492}
493
494int qemu_set_vnet_le(NetClientState *nc, bool is_le)
495{
496#ifdef HOST_WORDS_BIGENDIAN
497 if (!nc || !nc->info->set_vnet_le) {
498 return -ENOSYS;
499 }
500
501 return nc->info->set_vnet_le(nc, is_le);
502#else
503 return 0;
504#endif
505}
506
507int qemu_set_vnet_be(NetClientState *nc, bool is_be)
508{
509#ifdef HOST_WORDS_BIGENDIAN
510 return 0;
511#else
512 if (!nc || !nc->info->set_vnet_be) {
513 return -ENOSYS;
514 }
515
516 return nc->info->set_vnet_be(nc, is_be);
517#endif
518}
519
520int qemu_can_send_packet(NetClientState *sender)
521{
522 int vm_running = runstate_is_running();
523
524 if (!vm_running) {
525 return 0;
526 }
527
528 if (!sender->peer) {
529 return 1;
530 }
531
532 if (sender->peer->receive_disabled) {
533 return 0;
534 } else if (sender->peer->info->can_receive &&
535 !sender->peer->info->can_receive(sender->peer)) {
536 return 0;
537 }
538 return 1;
539}
540
541static ssize_t filter_receive_iov(NetClientState *nc,
542 NetFilterDirection direction,
543 NetClientState *sender,
544 unsigned flags,
545 const struct iovec *iov,
546 int iovcnt,
547 NetPacketSent *sent_cb)
548{
549 ssize_t ret = 0;
550 NetFilterState *nf = NULL;
551
552 if (direction == NET_FILTER_DIRECTION_TX) {
553 QTAILQ_FOREACH(nf, &nc->filters, next) {
554 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov,
555 iovcnt, sent_cb);
556 if (ret) {
557 return ret;
558 }
559 }
560 } else {
561 QTAILQ_FOREACH_REVERSE(nf, &nc->filters, NetFilterHead, next) {
562 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov,
563 iovcnt, sent_cb);
564 if (ret) {
565 return ret;
566 }
567 }
568 }
569
570 return ret;
571}
572
573static ssize_t filter_receive(NetClientState *nc,
574 NetFilterDirection direction,
575 NetClientState *sender,
576 unsigned flags,
577 const uint8_t *data,
578 size_t size,
579 NetPacketSent *sent_cb)
580{
581 struct iovec iov = {
582 .iov_base = (void *)data,
583 .iov_len = size
584 };
585
586 return filter_receive_iov(nc, direction, sender, flags, &iov, 1, sent_cb);
587}
588
589void qemu_purge_queued_packets(NetClientState *nc)
590{
591 if (!nc->peer) {
592 return;
593 }
594
595 qemu_net_queue_purge(nc->peer->incoming_queue, nc);
596}
597
598void qemu_flush_or_purge_queued_packets(NetClientState *nc, bool purge)
599{
600 nc->receive_disabled = 0;
601
602 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_HUBPORT) {
603 if (net_hub_flush(nc->peer)) {
604 qemu_notify_event();
605 }
606 }
607 if (qemu_net_queue_flush(nc->incoming_queue)) {
608
609
610
611 qemu_notify_event();
612 } else if (purge) {
613
614 qemu_net_queue_purge(nc->incoming_queue, nc);
615 }
616}
617
618void qemu_flush_queued_packets(NetClientState *nc)
619{
620 qemu_flush_or_purge_queued_packets(nc, false);
621}
622
623static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender,
624 unsigned flags,
625 const uint8_t *buf, int size,
626 NetPacketSent *sent_cb)
627{
628 NetQueue *queue;
629 int ret;
630
631#ifdef DEBUG_NET
632 printf("qemu_send_packet_async:\n");
633 qemu_hexdump((const char *)buf, stdout, "net", size);
634#endif
635
636 if (sender->link_down || !sender->peer) {
637 return size;
638 }
639
640
641 ret = filter_receive(sender, NET_FILTER_DIRECTION_TX,
642 sender, flags, buf, size, sent_cb);
643 if (ret) {
644 return ret;
645 }
646
647 ret = filter_receive(sender->peer, NET_FILTER_DIRECTION_RX,
648 sender, flags, buf, size, sent_cb);
649 if (ret) {
650 return ret;
651 }
652
653 queue = sender->peer->incoming_queue;
654
655 return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb);
656}
657
658ssize_t qemu_send_packet_async(NetClientState *sender,
659 const uint8_t *buf, int size,
660 NetPacketSent *sent_cb)
661{
662 return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE,
663 buf, size, sent_cb);
664}
665
666void qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size)
667{
668 qemu_send_packet_async(nc, buf, size, NULL);
669}
670
671ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size)
672{
673 return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW,
674 buf, size, NULL);
675}
676
677static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov,
678 int iovcnt, unsigned flags)
679{
680 uint8_t *buf = NULL;
681 uint8_t *buffer;
682 size_t offset;
683 ssize_t ret;
684
685 if (iovcnt == 1) {
686 buffer = iov[0].iov_base;
687 offset = iov[0].iov_len;
688 } else {
689 offset = iov_size(iov, iovcnt);
690 if (offset > NET_BUFSIZE) {
691 return -1;
692 }
693 buf = g_malloc(offset);
694 buffer = buf;
695 offset = iov_to_buf(iov, iovcnt, 0, buf, offset);
696 }
697
698 if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) {
699 ret = nc->info->receive_raw(nc, buffer, offset);
700 } else {
701 ret = nc->info->receive(nc, buffer, offset);
702 }
703
704 g_free(buf);
705 return ret;
706}
707
708ssize_t qemu_deliver_packet_iov(NetClientState *sender,
709 unsigned flags,
710 const struct iovec *iov,
711 int iovcnt,
712 void *opaque)
713{
714 NetClientState *nc = opaque;
715 int ret;
716
717 if (nc->link_down) {
718 return iov_size(iov, iovcnt);
719 }
720
721 if (nc->receive_disabled) {
722 return 0;
723 }
724
725 if (nc->info->receive_iov && !(flags & QEMU_NET_PACKET_FLAG_RAW)) {
726 ret = nc->info->receive_iov(nc, iov, iovcnt);
727 } else {
728 ret = nc_sendv_compat(nc, iov, iovcnt, flags);
729 }
730
731 if (ret == 0) {
732 nc->receive_disabled = 1;
733 }
734
735 return ret;
736}
737
738ssize_t qemu_sendv_packet_async(NetClientState *sender,
739 const struct iovec *iov, int iovcnt,
740 NetPacketSent *sent_cb)
741{
742 NetQueue *queue;
743 int ret;
744
745 if (sender->link_down || !sender->peer) {
746 return iov_size(iov, iovcnt);
747 }
748
749
750 ret = filter_receive_iov(sender, NET_FILTER_DIRECTION_TX, sender,
751 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb);
752 if (ret) {
753 return ret;
754 }
755
756 ret = filter_receive_iov(sender->peer, NET_FILTER_DIRECTION_RX, sender,
757 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb);
758 if (ret) {
759 return ret;
760 }
761
762 queue = sender->peer->incoming_queue;
763
764 return qemu_net_queue_send_iov(queue, sender,
765 QEMU_NET_PACKET_FLAG_NONE,
766 iov, iovcnt, sent_cb);
767}
768
769ssize_t
770qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt)
771{
772 return qemu_sendv_packet_async(nc, iov, iovcnt, NULL);
773}
774
775NetClientState *qemu_find_netdev(const char *id)
776{
777 NetClientState *nc;
778
779 QTAILQ_FOREACH(nc, &net_clients, next) {
780 if (nc->info->type == NET_CLIENT_DRIVER_NIC)
781 continue;
782 if (!strcmp(nc->name, id)) {
783 return nc;
784 }
785 }
786
787 return NULL;
788}
789
790int qemu_find_net_clients_except(const char *id, NetClientState **ncs,
791 NetClientDriver type, int max)
792{
793 NetClientState *nc;
794 int ret = 0;
795
796 QTAILQ_FOREACH(nc, &net_clients, next) {
797 if (nc->info->type == type) {
798 continue;
799 }
800 if (!id || !strcmp(nc->name, id)) {
801 if (ret < max) {
802 ncs[ret] = nc;
803 }
804 ret++;
805 }
806 }
807
808 return ret;
809}
810
811static int nic_get_free_idx(void)
812{
813 int index;
814
815 for (index = 0; index < MAX_NICS; index++)
816 if (!nd_table[index].used)
817 return index;
818 return -1;
819}
820
821int qemu_show_nic_models(const char *arg, const char *const *models)
822{
823 int i;
824
825 if (!arg || !is_help_option(arg)) {
826 return 0;
827 }
828
829 fprintf(stderr, "qemu: Supported NIC models: ");
830 for (i = 0 ; models[i]; i++)
831 fprintf(stderr, "%s%c", models[i], models[i+1] ? ',' : '\n');
832 return 1;
833}
834
835void qemu_check_nic_model(NICInfo *nd, const char *model)
836{
837 const char *models[2];
838
839 models[0] = model;
840 models[1] = NULL;
841
842 if (qemu_show_nic_models(nd->model, models))
843 exit(0);
844 if (qemu_find_nic_model(nd, models, model) < 0)
845 exit(1);
846}
847
848int qemu_find_nic_model(NICInfo *nd, const char * const *models,
849 const char *default_model)
850{
851 int i;
852
853 if (!nd->model)
854 nd->model = g_strdup(default_model);
855
856 for (i = 0 ; models[i]; i++) {
857 if (strcmp(nd->model, models[i]) == 0)
858 return i;
859 }
860
861 error_report("Unsupported NIC model: %s", nd->model);
862 return -1;
863}
864
865static int net_init_nic(const Netdev *netdev, const char *name,
866 NetClientState *peer, Error **errp)
867{
868 int idx;
869 NICInfo *nd;
870 const NetLegacyNicOptions *nic;
871
872 assert(netdev->type == NET_CLIENT_DRIVER_NIC);
873 nic = &netdev->u.nic;
874
875 idx = nic_get_free_idx();
876 if (idx == -1 || nb_nics >= MAX_NICS) {
877 error_setg(errp, "too many NICs");
878 return -1;
879 }
880
881 nd = &nd_table[idx];
882
883 memset(nd, 0, sizeof(*nd));
884
885 if (nic->has_netdev) {
886 nd->netdev = qemu_find_netdev(nic->netdev);
887 if (!nd->netdev) {
888 error_setg(errp, "netdev '%s' not found", nic->netdev);
889 return -1;
890 }
891 } else {
892 assert(peer);
893 nd->netdev = peer;
894 }
895 nd->name = g_strdup(name);
896 if (nic->has_model) {
897 nd->model = g_strdup(nic->model);
898 }
899 if (nic->has_addr) {
900 nd->devaddr = g_strdup(nic->addr);
901 }
902
903 if (nic->has_macaddr &&
904 net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) {
905 error_setg(errp, "invalid syntax for ethernet address");
906 return -1;
907 }
908 if (nic->has_macaddr &&
909 is_multicast_ether_addr(nd->macaddr.a)) {
910 error_setg(errp,
911 "NIC cannot have multicast MAC address (odd 1st byte)");
912 return -1;
913 }
914 qemu_macaddr_default_if_unset(&nd->macaddr);
915
916 if (nic->has_vectors) {
917 if (nic->vectors > 0x7ffffff) {
918 error_setg(errp, "invalid # of vectors: %"PRIu32, nic->vectors);
919 return -1;
920 }
921 nd->nvectors = nic->vectors;
922 } else {
923 nd->nvectors = DEV_NVECTORS_UNSPECIFIED;
924 }
925
926 nd->used = 1;
927 nb_nics++;
928
929 return idx;
930}
931
932
933static int (* const net_client_init_fun[NET_CLIENT_DRIVER__MAX])(
934 const Netdev *netdev,
935 const char *name,
936 NetClientState *peer, Error **errp) = {
937 [NET_CLIENT_DRIVER_NIC] = net_init_nic,
938#ifdef CONFIG_SLIRP
939 [NET_CLIENT_DRIVER_USER] = net_init_slirp,
940#endif
941 [NET_CLIENT_DRIVER_TAP] = net_init_tap,
942 [NET_CLIENT_DRIVER_SOCKET] = net_init_socket,
943#ifdef CONFIG_VDE
944 [NET_CLIENT_DRIVER_VDE] = net_init_vde,
945#endif
946#ifdef CONFIG_NETMAP
947 [NET_CLIENT_DRIVER_NETMAP] = net_init_netmap,
948#endif
949#ifdef CONFIG_NET_BRIDGE
950 [NET_CLIENT_DRIVER_BRIDGE] = net_init_bridge,
951#endif
952 [NET_CLIENT_DRIVER_HUBPORT] = net_init_hubport,
953#ifdef CONFIG_VHOST_NET_USED
954 [NET_CLIENT_DRIVER_VHOST_USER] = net_init_vhost_user,
955#endif
956#ifdef CONFIG_L2TPV3
957 [NET_CLIENT_DRIVER_L2TPV3] = net_init_l2tpv3,
958#endif
959};
960
961
962static int net_client_init1(const void *object, bool is_netdev, Error **errp)
963{
964 Netdev legacy = {0};
965 const Netdev *netdev;
966 const char *name;
967 NetClientState *peer = NULL;
968
969 if (is_netdev) {
970 netdev = object;
971 name = netdev->id;
972
973 if (netdev->type == NET_CLIENT_DRIVER_NIC ||
974 !net_client_init_fun[netdev->type]) {
975 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
976 "a netdev backend type");
977 return -1;
978 }
979 } else {
980 const NetLegacy *net = object;
981 const NetLegacyOptions *opts = net->opts;
982 legacy.id = net->id;
983 netdev = &legacy;
984
985 name = net->has_id ? net->id : net->name;
986
987
988 switch (opts->type) {
989 case NET_LEGACY_OPTIONS_TYPE_NONE:
990 return 0;
991 case NET_LEGACY_OPTIONS_TYPE_NIC:
992 legacy.type = NET_CLIENT_DRIVER_NIC;
993 legacy.u.nic = opts->u.nic;
994 break;
995 case NET_LEGACY_OPTIONS_TYPE_USER:
996 legacy.type = NET_CLIENT_DRIVER_USER;
997 legacy.u.user = opts->u.user;
998 break;
999 case NET_LEGACY_OPTIONS_TYPE_TAP:
1000 legacy.type = NET_CLIENT_DRIVER_TAP;
1001 legacy.u.tap = opts->u.tap;
1002 break;
1003 case NET_LEGACY_OPTIONS_TYPE_L2TPV3:
1004 legacy.type = NET_CLIENT_DRIVER_L2TPV3;
1005 legacy.u.l2tpv3 = opts->u.l2tpv3;
1006 break;
1007 case NET_LEGACY_OPTIONS_TYPE_SOCKET:
1008 legacy.type = NET_CLIENT_DRIVER_SOCKET;
1009 legacy.u.socket = opts->u.socket;
1010 break;
1011 case NET_LEGACY_OPTIONS_TYPE_VDE:
1012 legacy.type = NET_CLIENT_DRIVER_VDE;
1013 legacy.u.vde = opts->u.vde;
1014 break;
1015 case NET_LEGACY_OPTIONS_TYPE_BRIDGE:
1016 legacy.type = NET_CLIENT_DRIVER_BRIDGE;
1017 legacy.u.bridge = opts->u.bridge;
1018 break;
1019 case NET_LEGACY_OPTIONS_TYPE_NETMAP:
1020 legacy.type = NET_CLIENT_DRIVER_NETMAP;
1021 legacy.u.netmap = opts->u.netmap;
1022 break;
1023 case NET_LEGACY_OPTIONS_TYPE_VHOST_USER:
1024 legacy.type = NET_CLIENT_DRIVER_VHOST_USER;
1025 legacy.u.vhost_user = opts->u.vhost_user;
1026 break;
1027 default:
1028 abort();
1029 }
1030
1031 if (!net_client_init_fun[netdev->type]) {
1032 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
1033 "a net backend type (maybe it is not compiled "
1034 "into this binary)");
1035 return -1;
1036 }
1037
1038
1039 if (netdev->type != NET_CLIENT_DRIVER_NIC ||
1040 !opts->u.nic.has_netdev) {
1041 peer = net_hub_add_port(0, NULL, NULL);
1042 }
1043 }
1044
1045 if (net_client_init_fun[netdev->type](netdev, name, peer, errp) < 0) {
1046
1047 if (errp && !*errp) {
1048 error_setg(errp, QERR_DEVICE_INIT_FAILED,
1049 NetClientDriver_str(netdev->type));
1050 }
1051 return -1;
1052 }
1053 return 0;
1054}
1055
1056static void show_netdevs(void)
1057{
1058 int idx;
1059 const char *available_netdevs[] = {
1060 "socket",
1061 "hubport",
1062 "tap",
1063#ifdef CONFIG_SLIRP
1064 "user",
1065#endif
1066#ifdef CONFIG_L2TPV3
1067 "l2tpv3",
1068#endif
1069#ifdef CONFIG_VDE
1070 "vde",
1071#endif
1072#ifdef CONFIG_NET_BRIDGE
1073 "bridge",
1074#endif
1075#ifdef CONFIG_NETMAP
1076 "netmap",
1077#endif
1078#ifdef CONFIG_POSIX
1079 "vhost-user",
1080#endif
1081 };
1082
1083 printf("Available netdev backend types:\n");
1084 for (idx = 0; idx < ARRAY_SIZE(available_netdevs); idx++) {
1085 puts(available_netdevs[idx]);
1086 }
1087}
1088
1089static int net_client_init(QemuOpts *opts, bool is_netdev, Error **errp)
1090{
1091 void *object = NULL;
1092 Error *err = NULL;
1093 int ret = -1;
1094 Visitor *v = opts_visitor_new(opts);
1095
1096 const char *type = qemu_opt_get(opts, "type");
1097
1098 if (is_netdev && type && is_help_option(type)) {
1099 show_netdevs();
1100 exit(0);
1101 } else {
1102
1103 const char *ip6_net = qemu_opt_get(opts, "ipv6-net");
1104
1105 if (ip6_net) {
1106 char buf[strlen(ip6_net) + 1];
1107
1108 if (get_str_sep(buf, sizeof(buf), &ip6_net, '/') < 0) {
1109
1110 qemu_opt_set(opts, "ipv6-prefix", ip6_net, &error_abort);
1111 qemu_opt_set_number(opts, "ipv6-prefixlen", 64, &error_abort);
1112 } else {
1113
1114 unsigned long len;
1115 int err;
1116
1117 qemu_opt_set(opts, "ipv6-prefix", buf, &error_abort);
1118 err = qemu_strtoul(ip6_net, NULL, 10, &len);
1119
1120 if (err) {
1121 error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1122 "ipv6-prefix", "a number");
1123 } else {
1124 qemu_opt_set_number(opts, "ipv6-prefixlen", len,
1125 &error_abort);
1126 }
1127 }
1128 qemu_opt_unset(opts, "ipv6-net");
1129 }
1130 }
1131
1132 if (is_netdev) {
1133 visit_type_Netdev(v, NULL, (Netdev **)&object, &err);
1134 } else {
1135 visit_type_NetLegacy(v, NULL, (NetLegacy **)&object, &err);
1136 }
1137
1138 if (!err) {
1139 ret = net_client_init1(object, is_netdev, &err);
1140 }
1141
1142 if (is_netdev) {
1143 qapi_free_Netdev(object);
1144 } else {
1145 qapi_free_NetLegacy(object);
1146 }
1147
1148 error_propagate(errp, err);
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(QDict *qdict, QObject **ret, Error **errp)
1159{
1160 Error *local_err = NULL;
1161 QemuOptsList *opts_list;
1162 QemuOpts *opts;
1163
1164 opts_list = qemu_find_opts_err("netdev", &local_err);
1165 if (local_err) {
1166 goto out;
1167 }
1168
1169 opts = qemu_opts_from_qdict(opts_list, qdict, &local_err);
1170 if (local_err) {
1171 goto out;
1172 }
1173
1174 netdev_add(opts, &local_err);
1175 if (local_err) {
1176 qemu_opts_del(opts);
1177 goto out;
1178 }
1179
1180out:
1181 error_propagate(errp, local_err);
1182}
1183
1184void qmp_netdev_del(const char *id, Error **errp)
1185{
1186 NetClientState *nc;
1187 QemuOpts *opts;
1188
1189 nc = qemu_find_netdev(id);
1190 if (!nc) {
1191 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1192 "Device '%s' not found", id);
1193 return;
1194 }
1195
1196 opts = qemu_opts_find(qemu_find_opts_err("netdev", NULL), id);
1197 if (!opts) {
1198 error_setg(errp, "Device '%s' is not a netdev", id);
1199 return;
1200 }
1201
1202 qemu_del_net_client(nc);
1203 qemu_opts_del(opts);
1204}
1205
1206static void netfilter_print_info(Monitor *mon, NetFilterState *nf)
1207{
1208 char *str;
1209 ObjectProperty *prop;
1210 ObjectPropertyIterator iter;
1211 Visitor *v;
1212
1213
1214 object_property_iter_init(&iter, OBJECT(nf));
1215 while ((prop = object_property_iter_next(&iter))) {
1216 if (!strcmp(prop->name, "type")) {
1217 continue;
1218 }
1219 v = string_output_visitor_new(false, &str);
1220 object_property_get(OBJECT(nf), v, prop->name, NULL);
1221 visit_complete(v, &str);
1222 visit_free(v);
1223 monitor_printf(mon, ",%s=%s", prop->name, str);
1224 g_free(str);
1225 }
1226 monitor_printf(mon, "\n");
1227}
1228
1229void print_net_client(Monitor *mon, NetClientState *nc)
1230{
1231 NetFilterState *nf;
1232
1233 monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name,
1234 nc->queue_index,
1235 NetClientDriver_str(nc->info->type),
1236 nc->info_str);
1237 if (!QTAILQ_EMPTY(&nc->filters)) {
1238 monitor_printf(mon, "filters:\n");
1239 }
1240 QTAILQ_FOREACH(nf, &nc->filters, next) {
1241 char *path = object_get_canonical_path_component(OBJECT(nf));
1242
1243 monitor_printf(mon, " - %s: type=%s", path,
1244 object_get_typename(OBJECT(nf)));
1245 netfilter_print_info(mon, nf);
1246 g_free(path);
1247 }
1248}
1249
1250RxFilterInfoList *qmp_query_rx_filter(bool has_name, const char *name,
1251 Error **errp)
1252{
1253 NetClientState *nc;
1254 RxFilterInfoList *filter_list = NULL, *last_entry = NULL;
1255
1256 QTAILQ_FOREACH(nc, &net_clients, next) {
1257 RxFilterInfoList *entry;
1258 RxFilterInfo *info;
1259
1260 if (has_name && strcmp(nc->name, name) != 0) {
1261 continue;
1262 }
1263
1264
1265 if (nc->info->type != NET_CLIENT_DRIVER_NIC) {
1266 if (has_name) {
1267 error_setg(errp, "net client(%s) isn't a NIC", name);
1268 return NULL;
1269 }
1270 continue;
1271 }
1272
1273
1274
1275
1276 if (nc->queue_index != 0)
1277 continue;
1278
1279 if (nc->info->query_rx_filter) {
1280 info = nc->info->query_rx_filter(nc);
1281 entry = g_malloc0(sizeof(*entry));
1282 entry->value = info;
1283
1284 if (!filter_list) {
1285 filter_list = entry;
1286 } else {
1287 last_entry->next = entry;
1288 }
1289 last_entry = entry;
1290 } else if (has_name) {
1291 error_setg(errp, "net client(%s) doesn't support"
1292 " rx-filter querying", name);
1293 return NULL;
1294 }
1295
1296 if (has_name) {
1297 break;
1298 }
1299 }
1300
1301 if (filter_list == NULL && has_name) {
1302 error_setg(errp, "invalid net client name: %s", name);
1303 }
1304
1305 return filter_list;
1306}
1307
1308void hmp_info_network(Monitor *mon, const QDict *qdict)
1309{
1310 NetClientState *nc, *peer;
1311 NetClientDriver type;
1312
1313 net_hub_info(mon);
1314
1315 QTAILQ_FOREACH(nc, &net_clients, next) {
1316 peer = nc->peer;
1317 type = nc->info->type;
1318
1319
1320 if (net_hub_id_for_client(nc, NULL) == 0) {
1321 continue;
1322 }
1323
1324 if (!peer || type == NET_CLIENT_DRIVER_NIC) {
1325 print_net_client(mon, nc);
1326 }
1327 if (peer && type == NET_CLIENT_DRIVER_NIC) {
1328 monitor_printf(mon, " \\ ");
1329 print_net_client(mon, peer);
1330 }
1331 }
1332}
1333
1334void qmp_set_link(const char *name, bool up, Error **errp)
1335{
1336 NetClientState *ncs[MAX_QUEUE_NUM];
1337 NetClientState *nc;
1338 int queues, i;
1339
1340 queues = qemu_find_net_clients_except(name, ncs,
1341 NET_CLIENT_DRIVER__MAX,
1342 MAX_QUEUE_NUM);
1343
1344 if (queues == 0) {
1345 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1346 "Device '%s' not found", name);
1347 return;
1348 }
1349 nc = ncs[0];
1350
1351 for (i = 0; i < queues; i++) {
1352 ncs[i]->link_down = !up;
1353 }
1354
1355 if (nc->info->link_status_changed) {
1356 nc->info->link_status_changed(nc);
1357 }
1358
1359 if (nc->peer) {
1360
1361
1362
1363
1364
1365
1366
1367
1368 if (nc->peer->info->type == NET_CLIENT_DRIVER_NIC) {
1369 for (i = 0; i < queues; i++) {
1370 ncs[i]->peer->link_down = !up;
1371 }
1372 }
1373 if (nc->peer->info->link_status_changed) {
1374 nc->peer->info->link_status_changed(nc->peer);
1375 }
1376 }
1377}
1378
1379static void net_vm_change_state_handler(void *opaque, int running,
1380 RunState state)
1381{
1382 NetClientState *nc;
1383 NetClientState *tmp;
1384
1385 QTAILQ_FOREACH_SAFE(nc, &net_clients, next, tmp) {
1386 if (running) {
1387
1388 if (nc->peer && qemu_can_send_packet(nc)) {
1389 qemu_flush_queued_packets(nc->peer);
1390 }
1391 } else {
1392
1393
1394
1395 qemu_flush_or_purge_queued_packets(nc, true);
1396 }
1397 }
1398}
1399
1400void net_cleanup(void)
1401{
1402 NetClientState *nc;
1403
1404
1405
1406
1407 while (!QTAILQ_EMPTY(&net_clients)) {
1408 nc = QTAILQ_FIRST(&net_clients);
1409 if (nc->info->type == NET_CLIENT_DRIVER_NIC) {
1410 qemu_del_nic(qemu_get_nic(nc));
1411 } else {
1412 qemu_del_net_client(nc);
1413 }
1414 }
1415
1416 qemu_del_vm_change_state_handler(net_change_state_entry);
1417}
1418
1419void net_check_clients(void)
1420{
1421 NetClientState *nc;
1422 int i;
1423
1424 net_hub_check_clients();
1425
1426 QTAILQ_FOREACH(nc, &net_clients, next) {
1427 if (!nc->peer) {
1428 warn_report("%s %s has no peer",
1429 nc->info->type == NET_CLIENT_DRIVER_NIC
1430 ? "nic" : "netdev",
1431 nc->name);
1432 }
1433 }
1434
1435
1436
1437
1438
1439 for (i = 0; i < MAX_NICS; i++) {
1440 NICInfo *nd = &nd_table[i];
1441 if (nd->used && !nd->instantiated) {
1442 warn_report("requested NIC (%s, model %s) "
1443 "was not created (not supported by this machine?)",
1444 nd->name ? nd->name : "anonymous",
1445 nd->model ? nd->model : "unspecified");
1446 }
1447 }
1448}
1449
1450static int net_init_client(void *dummy, QemuOpts *opts, Error **errp)
1451{
1452 return net_client_init(opts, false, errp);
1453}
1454
1455static int net_init_netdev(void *dummy, QemuOpts *opts, Error **errp)
1456{
1457 return net_client_init(opts, true, errp);
1458}
1459
1460
1461static int net_param_nic(void *dummy, QemuOpts *opts, Error **errp)
1462{
1463 char *mac, *nd_id;
1464 int idx, ret;
1465 NICInfo *ni;
1466 const char *type;
1467
1468 type = qemu_opt_get(opts, "type");
1469 if (type && g_str_equal(type, "none")) {
1470 return 0;
1471 }
1472
1473 idx = nic_get_free_idx();
1474 if (idx == -1 || nb_nics >= MAX_NICS) {
1475 error_setg(errp, "no more on-board/default NIC slots available");
1476 return -1;
1477 }
1478
1479 if (!type) {
1480 qemu_opt_set(opts, "type", "user", &error_abort);
1481 }
1482
1483 ni = &nd_table[idx];
1484 memset(ni, 0, sizeof(*ni));
1485 ni->model = qemu_opt_get_del(opts, "model");
1486
1487
1488 nd_id = g_strdup(qemu_opts_id(opts));
1489 if (!nd_id) {
1490 nd_id = g_strdup_printf("__org.qemu.nic%i\n", idx);
1491 qemu_opts_set_id(opts, nd_id);
1492 }
1493
1494
1495 mac = qemu_opt_get_del(opts, "mac");
1496 if (mac) {
1497 ret = net_parse_macaddr(ni->macaddr.a, mac);
1498 g_free(mac);
1499 if (ret) {
1500 error_setg(errp, "invalid syntax for ethernet address");
1501 goto out;
1502 }
1503 if (is_multicast_ether_addr(ni->macaddr.a)) {
1504 error_setg(errp, "NIC cannot have multicast MAC address");
1505 ret = -1;
1506 goto out;
1507 }
1508 }
1509 qemu_macaddr_default_if_unset(&ni->macaddr);
1510
1511 ret = net_client_init(opts, true, errp);
1512 if (ret == 0) {
1513 ni->netdev = qemu_find_netdev(nd_id);
1514 ni->used = true;
1515 nb_nics++;
1516 }
1517
1518out:
1519 g_free(nd_id);
1520 return ret;
1521}
1522
1523int net_init_clients(Error **errp)
1524{
1525 net_change_state_entry =
1526 qemu_add_vm_change_state_handler(net_vm_change_state_handler, NULL);
1527
1528 QTAILQ_INIT(&net_clients);
1529
1530 if (qemu_opts_foreach(qemu_find_opts("netdev"),
1531 net_init_netdev, NULL, errp)) {
1532 return -1;
1533 }
1534
1535 if (qemu_opts_foreach(qemu_find_opts("nic"), net_param_nic, NULL, errp)) {
1536 return -1;
1537 }
1538
1539 if (qemu_opts_foreach(qemu_find_opts("net"), net_init_client, NULL, errp)) {
1540 return -1;
1541 }
1542
1543 return 0;
1544}
1545
1546int net_client_parse(QemuOptsList *opts_list, const char *optarg)
1547{
1548 if (!qemu_opts_parse_noisily(opts_list, optarg, true)) {
1549 return -1;
1550 }
1551
1552 return 0;
1553}
1554
1555
1556
1557uint32_t net_crc32(const uint8_t *p, int len)
1558{
1559 uint32_t crc;
1560 int carry, i, j;
1561 uint8_t b;
1562
1563 crc = 0xffffffff;
1564 for (i = 0; i < len; i++) {
1565 b = *p++;
1566 for (j = 0; j < 8; j++) {
1567 carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01);
1568 crc <<= 1;
1569 b >>= 1;
1570 if (carry) {
1571 crc = ((crc ^ POLYNOMIAL_BE) | carry);
1572 }
1573 }
1574 }
1575
1576 return crc;
1577}
1578
1579uint32_t net_crc32_le(const uint8_t *p, int len)
1580{
1581 uint32_t crc;
1582 int carry, i, j;
1583 uint8_t b;
1584
1585 crc = 0xffffffff;
1586 for (i = 0; i < len; i++) {
1587 b = *p++;
1588 for (j = 0; j < 8; j++) {
1589 carry = (crc & 0x1) ^ (b & 0x01);
1590 crc >>= 1;
1591 b >>= 1;
1592 if (carry) {
1593 crc ^= POLYNOMIAL_LE;
1594 }
1595 }
1596 }
1597
1598 return crc;
1599}
1600
1601QemuOptsList qemu_netdev_opts = {
1602 .name = "netdev",
1603 .implied_opt_name = "type",
1604 .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head),
1605 .desc = {
1606
1607
1608
1609
1610 { }
1611 },
1612};
1613
1614QemuOptsList qemu_nic_opts = {
1615 .name = "nic",
1616 .implied_opt_name = "type",
1617 .head = QTAILQ_HEAD_INITIALIZER(qemu_nic_opts.head),
1618 .desc = {
1619
1620
1621
1622
1623 { }
1624 },
1625};
1626
1627QemuOptsList qemu_net_opts = {
1628 .name = "net",
1629 .implied_opt_name = "type",
1630 .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head),
1631 .desc = {
1632
1633
1634
1635
1636 { }
1637 },
1638};
1639
1640void net_socket_rs_init(SocketReadState *rs,
1641 SocketReadStateFinalize *finalize,
1642 bool vnet_hdr)
1643{
1644 rs->state = 0;
1645 rs->vnet_hdr = vnet_hdr;
1646 rs->index = 0;
1647 rs->packet_len = 0;
1648 rs->vnet_hdr_len = 0;
1649 memset(rs->buf, 0, sizeof(rs->buf));
1650 rs->finalize = finalize;
1651}
1652
1653
1654
1655
1656
1657
1658int net_fill_rstate(SocketReadState *rs, const uint8_t *buf, int size)
1659{
1660 unsigned int l;
1661
1662 while (size > 0) {
1663
1664
1665
1666
1667
1668 switch (rs->state) {
1669 case 0:
1670 l = 4 - rs->index;
1671 if (l > size) {
1672 l = size;
1673 }
1674 memcpy(rs->buf + rs->index, buf, l);
1675 buf += l;
1676 size -= l;
1677 rs->index += l;
1678 if (rs->index == 4) {
1679
1680 rs->packet_len = ntohl(*(uint32_t *)rs->buf);
1681 rs->index = 0;
1682 if (rs->vnet_hdr) {
1683 rs->state = 1;
1684 } else {
1685 rs->state = 2;
1686 rs->vnet_hdr_len = 0;
1687 }
1688 }
1689 break;
1690 case 1:
1691 l = 4 - rs->index;
1692 if (l > size) {
1693 l = size;
1694 }
1695 memcpy(rs->buf + rs->index, buf, l);
1696 buf += l;
1697 size -= l;
1698 rs->index += l;
1699 if (rs->index == 4) {
1700
1701 rs->vnet_hdr_len = ntohl(*(uint32_t *)rs->buf);
1702 rs->index = 0;
1703 rs->state = 2;
1704 }
1705 break;
1706 case 2:
1707 l = rs->packet_len - rs->index;
1708 if (l > size) {
1709 l = size;
1710 }
1711 if (rs->index + l <= sizeof(rs->buf)) {
1712 memcpy(rs->buf + rs->index, buf, l);
1713 } else {
1714 fprintf(stderr, "serious error: oversized packet received,"
1715 "connection terminated.\n");
1716 rs->index = rs->state = 0;
1717 return -1;
1718 }
1719
1720 rs->index += l;
1721 buf += l;
1722 size -= l;
1723 if (rs->index >= rs->packet_len) {
1724 rs->index = 0;
1725 rs->state = 0;
1726 assert(rs->finalize);
1727 rs->finalize(rs);
1728 }
1729 break;
1730 }
1731 }
1732
1733 assert(size == 0);
1734 return 0;
1735}
1736