scsi: esp: check buffer length before reading scsi command
[qemu.git] / net / net.c
1 /*
2 * QEMU System Emulator
3 *
4 * Copyright (c) 2003-2008 Fabrice Bellard
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22 * THE SOFTWARE.
23 */
24 #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 "net/filter.h"
49 #include "qapi/string-output-visitor.h"
50
51 /* Net bridge is currently not supported for W32. */
52 #if !defined(_WIN32)
53 # define CONFIG_NET_BRIDGE
54 #endif
55
56 static VMChangeStateEntry *net_change_state_entry;
57 static QTAILQ_HEAD(, NetClientState) net_clients;
58
59 const char *host_net_devices[] = {
60 "tap",
61 "socket",
62 "dump",
63 #ifdef CONFIG_NET_BRIDGE
64 "bridge",
65 #endif
66 #ifdef CONFIG_NETMAP
67 "netmap",
68 #endif
69 #ifdef CONFIG_SLIRP
70 "user",
71 #endif
72 #ifdef CONFIG_VDE
73 "vde",
74 #endif
75 "vhost-user",
76 NULL,
77 };
78
79 /***********************************************************/
80 /* network device redirectors */
81
82 static int get_str_sep(char *buf, int buf_size, const char **pp, int sep)
83 {
84 const char *p, *p1;
85 int len;
86 p = *pp;
87 p1 = strchr(p, sep);
88 if (!p1)
89 return -1;
90 len = p1 - p;
91 p1++;
92 if (buf_size > 0) {
93 if (len > buf_size - 1)
94 len = buf_size - 1;
95 memcpy(buf, p, len);
96 buf[len] = '\0';
97 }
98 *pp = p1;
99 return 0;
100 }
101
102 int parse_host_port(struct sockaddr_in *saddr, const char *str)
103 {
104 char buf[512];
105 struct hostent *he;
106 const char *p, *r;
107 int port;
108
109 p = str;
110 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0)
111 return -1;
112 saddr->sin_family = AF_INET;
113 if (buf[0] == '\0') {
114 saddr->sin_addr.s_addr = 0;
115 } else {
116 if (qemu_isdigit(buf[0])) {
117 if (!inet_aton(buf, &saddr->sin_addr))
118 return -1;
119 } else {
120 if ((he = gethostbyname(buf)) == NULL)
121 return - 1;
122 saddr->sin_addr = *(struct in_addr *)he->h_addr;
123 }
124 }
125 port = strtol(p, (char **)&r, 0);
126 if (r == p)
127 return -1;
128 saddr->sin_port = htons(port);
129 return 0;
130 }
131
132 char *qemu_mac_strdup_printf(const uint8_t *macaddr)
133 {
134 return g_strdup_printf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x",
135 macaddr[0], macaddr[1], macaddr[2],
136 macaddr[3], macaddr[4], macaddr[5]);
137 }
138
139 void qemu_format_nic_info_str(NetClientState *nc, uint8_t macaddr[6])
140 {
141 snprintf(nc->info_str, sizeof(nc->info_str),
142 "model=%s,macaddr=%02x:%02x:%02x:%02x:%02x:%02x",
143 nc->model,
144 macaddr[0], macaddr[1], macaddr[2],
145 macaddr[3], macaddr[4], macaddr[5]);
146 }
147
148 static int mac_table[256] = {0};
149
150 static void qemu_macaddr_set_used(MACAddr *macaddr)
151 {
152 int index;
153
154 for (index = 0x56; index < 0xFF; index++) {
155 if (macaddr->a[5] == index) {
156 mac_table[index]++;
157 }
158 }
159 }
160
161 static void qemu_macaddr_set_free(MACAddr *macaddr)
162 {
163 int index;
164 static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } };
165
166 if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) {
167 return;
168 }
169 for (index = 0x56; index < 0xFF; index++) {
170 if (macaddr->a[5] == index) {
171 mac_table[index]--;
172 }
173 }
174 }
175
176 static int qemu_macaddr_get_free(void)
177 {
178 int index;
179
180 for (index = 0x56; index < 0xFF; index++) {
181 if (mac_table[index] == 0) {
182 return index;
183 }
184 }
185
186 return -1;
187 }
188
189 void qemu_macaddr_default_if_unset(MACAddr *macaddr)
190 {
191 static const MACAddr zero = { .a = { 0,0,0,0,0,0 } };
192 static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } };
193
194 if (memcmp(macaddr, &zero, sizeof(zero)) != 0) {
195 if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) {
196 return;
197 } else {
198 qemu_macaddr_set_used(macaddr);
199 return;
200 }
201 }
202
203 macaddr->a[0] = 0x52;
204 macaddr->a[1] = 0x54;
205 macaddr->a[2] = 0x00;
206 macaddr->a[3] = 0x12;
207 macaddr->a[4] = 0x34;
208 macaddr->a[5] = qemu_macaddr_get_free();
209 qemu_macaddr_set_used(macaddr);
210 }
211
212 /**
213 * Generate a name for net client
214 *
215 * Only net clients created with the legacy -net option and NICs need this.
216 */
217 static char *assign_name(NetClientState *nc1, const char *model)
218 {
219 NetClientState *nc;
220 int id = 0;
221
222 QTAILQ_FOREACH(nc, &net_clients, next) {
223 if (nc == nc1) {
224 continue;
225 }
226 if (strcmp(nc->model, model) == 0) {
227 id++;
228 }
229 }
230
231 return g_strdup_printf("%s.%d", model, id);
232 }
233
234 static void qemu_net_client_destructor(NetClientState *nc)
235 {
236 g_free(nc);
237 }
238
239 static void qemu_net_client_setup(NetClientState *nc,
240 NetClientInfo *info,
241 NetClientState *peer,
242 const char *model,
243 const char *name,
244 NetClientDestructor *destructor)
245 {
246 nc->info = info;
247 nc->model = g_strdup(model);
248 if (name) {
249 nc->name = g_strdup(name);
250 } else {
251 nc->name = assign_name(nc, model);
252 }
253
254 if (peer) {
255 assert(!peer->peer);
256 nc->peer = peer;
257 peer->peer = nc;
258 }
259 QTAILQ_INSERT_TAIL(&net_clients, nc, next);
260
261 nc->incoming_queue = qemu_new_net_queue(qemu_deliver_packet_iov, nc);
262 nc->destructor = destructor;
263 QTAILQ_INIT(&nc->filters);
264 }
265
266 NetClientState *qemu_new_net_client(NetClientInfo *info,
267 NetClientState *peer,
268 const char *model,
269 const char *name)
270 {
271 NetClientState *nc;
272
273 assert(info->size >= sizeof(NetClientState));
274
275 nc = g_malloc0(info->size);
276 qemu_net_client_setup(nc, info, peer, model, name,
277 qemu_net_client_destructor);
278
279 return nc;
280 }
281
282 NICState *qemu_new_nic(NetClientInfo *info,
283 NICConf *conf,
284 const char *model,
285 const char *name,
286 void *opaque)
287 {
288 NetClientState **peers = conf->peers.ncs;
289 NICState *nic;
290 int i, queues = MAX(1, conf->peers.queues);
291
292 assert(info->type == NET_CLIENT_OPTIONS_KIND_NIC);
293 assert(info->size >= sizeof(NICState));
294
295 nic = g_malloc0(info->size + sizeof(NetClientState) * queues);
296 nic->ncs = (void *)nic + info->size;
297 nic->conf = conf;
298 nic->opaque = opaque;
299
300 for (i = 0; i < queues; i++) {
301 qemu_net_client_setup(&nic->ncs[i], info, peers[i], model, name,
302 NULL);
303 nic->ncs[i].queue_index = i;
304 }
305
306 return nic;
307 }
308
309 NetClientState *qemu_get_subqueue(NICState *nic, int queue_index)
310 {
311 return nic->ncs + queue_index;
312 }
313
314 NetClientState *qemu_get_queue(NICState *nic)
315 {
316 return qemu_get_subqueue(nic, 0);
317 }
318
319 NICState *qemu_get_nic(NetClientState *nc)
320 {
321 NetClientState *nc0 = nc - nc->queue_index;
322
323 return (NICState *)((void *)nc0 - nc->info->size);
324 }
325
326 void *qemu_get_nic_opaque(NetClientState *nc)
327 {
328 NICState *nic = qemu_get_nic(nc);
329
330 return nic->opaque;
331 }
332
333 static void qemu_cleanup_net_client(NetClientState *nc)
334 {
335 QTAILQ_REMOVE(&net_clients, nc, next);
336
337 if (nc->info->cleanup) {
338 nc->info->cleanup(nc);
339 }
340 }
341
342 static void qemu_free_net_client(NetClientState *nc)
343 {
344 if (nc->incoming_queue) {
345 qemu_del_net_queue(nc->incoming_queue);
346 }
347 if (nc->peer) {
348 nc->peer->peer = NULL;
349 }
350 g_free(nc->name);
351 g_free(nc->model);
352 if (nc->destructor) {
353 nc->destructor(nc);
354 }
355 }
356
357 void qemu_del_net_client(NetClientState *nc)
358 {
359 NetClientState *ncs[MAX_QUEUE_NUM];
360 int queues, i;
361 NetFilterState *nf, *next;
362
363 assert(nc->info->type != NET_CLIENT_OPTIONS_KIND_NIC);
364
365 /* If the NetClientState belongs to a multiqueue backend, we will change all
366 * other NetClientStates also.
367 */
368 queues = qemu_find_net_clients_except(nc->name, ncs,
369 NET_CLIENT_OPTIONS_KIND_NIC,
370 MAX_QUEUE_NUM);
371 assert(queues != 0);
372
373 QTAILQ_FOREACH_SAFE(nf, &nc->filters, next, next) {
374 object_unparent(OBJECT(nf));
375 }
376
377 /* If there is a peer NIC, delete and cleanup client, but do not free. */
378 if (nc->peer && nc->peer->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
379 NICState *nic = qemu_get_nic(nc->peer);
380 if (nic->peer_deleted) {
381 return;
382 }
383 nic->peer_deleted = true;
384
385 for (i = 0; i < queues; i++) {
386 ncs[i]->peer->link_down = true;
387 }
388
389 if (nc->peer->info->link_status_changed) {
390 nc->peer->info->link_status_changed(nc->peer);
391 }
392
393 for (i = 0; i < queues; i++) {
394 qemu_cleanup_net_client(ncs[i]);
395 }
396
397 return;
398 }
399
400 for (i = 0; i < queues; i++) {
401 qemu_cleanup_net_client(ncs[i]);
402 qemu_free_net_client(ncs[i]);
403 }
404 }
405
406 void qemu_del_nic(NICState *nic)
407 {
408 int i, queues = MAX(nic->conf->peers.queues, 1);
409
410 qemu_macaddr_set_free(&nic->conf->macaddr);
411
412 /* If this is a peer NIC and peer has already been deleted, free it now. */
413 if (nic->peer_deleted) {
414 for (i = 0; i < queues; i++) {
415 qemu_free_net_client(qemu_get_subqueue(nic, i)->peer);
416 }
417 }
418
419 for (i = queues - 1; i >= 0; i--) {
420 NetClientState *nc = qemu_get_subqueue(nic, i);
421
422 qemu_cleanup_net_client(nc);
423 qemu_free_net_client(nc);
424 }
425
426 g_free(nic);
427 }
428
429 void qemu_foreach_nic(qemu_nic_foreach func, void *opaque)
430 {
431 NetClientState *nc;
432
433 QTAILQ_FOREACH(nc, &net_clients, next) {
434 if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
435 if (nc->queue_index == 0) {
436 func(qemu_get_nic(nc), opaque);
437 }
438 }
439 }
440 }
441
442 bool qemu_has_ufo(NetClientState *nc)
443 {
444 if (!nc || !nc->info->has_ufo) {
445 return false;
446 }
447
448 return nc->info->has_ufo(nc);
449 }
450
451 bool qemu_has_vnet_hdr(NetClientState *nc)
452 {
453 if (!nc || !nc->info->has_vnet_hdr) {
454 return false;
455 }
456
457 return nc->info->has_vnet_hdr(nc);
458 }
459
460 bool qemu_has_vnet_hdr_len(NetClientState *nc, int len)
461 {
462 if (!nc || !nc->info->has_vnet_hdr_len) {
463 return false;
464 }
465
466 return nc->info->has_vnet_hdr_len(nc, len);
467 }
468
469 void qemu_using_vnet_hdr(NetClientState *nc, bool enable)
470 {
471 if (!nc || !nc->info->using_vnet_hdr) {
472 return;
473 }
474
475 nc->info->using_vnet_hdr(nc, enable);
476 }
477
478 void qemu_set_offload(NetClientState *nc, int csum, int tso4, int tso6,
479 int ecn, int ufo)
480 {
481 if (!nc || !nc->info->set_offload) {
482 return;
483 }
484
485 nc->info->set_offload(nc, csum, tso4, tso6, ecn, ufo);
486 }
487
488 void qemu_set_vnet_hdr_len(NetClientState *nc, int len)
489 {
490 if (!nc || !nc->info->set_vnet_hdr_len) {
491 return;
492 }
493
494 nc->info->set_vnet_hdr_len(nc, len);
495 }
496
497 int qemu_set_vnet_le(NetClientState *nc, bool is_le)
498 {
499 #ifdef HOST_WORDS_BIGENDIAN
500 if (!nc || !nc->info->set_vnet_le) {
501 return -ENOSYS;
502 }
503
504 return nc->info->set_vnet_le(nc, is_le);
505 #else
506 return 0;
507 #endif
508 }
509
510 int qemu_set_vnet_be(NetClientState *nc, bool is_be)
511 {
512 #ifdef HOST_WORDS_BIGENDIAN
513 return 0;
514 #else
515 if (!nc || !nc->info->set_vnet_be) {
516 return -ENOSYS;
517 }
518
519 return nc->info->set_vnet_be(nc, is_be);
520 #endif
521 }
522
523 int qemu_can_send_packet(NetClientState *sender)
524 {
525 int vm_running = runstate_is_running();
526
527 if (!vm_running) {
528 return 0;
529 }
530
531 if (!sender->peer) {
532 return 1;
533 }
534
535 if (sender->peer->receive_disabled) {
536 return 0;
537 } else if (sender->peer->info->can_receive &&
538 !sender->peer->info->can_receive(sender->peer)) {
539 return 0;
540 }
541 return 1;
542 }
543
544 static ssize_t filter_receive_iov(NetClientState *nc,
545 NetFilterDirection direction,
546 NetClientState *sender,
547 unsigned flags,
548 const struct iovec *iov,
549 int iovcnt,
550 NetPacketSent *sent_cb)
551 {
552 ssize_t ret = 0;
553 NetFilterState *nf = NULL;
554
555 if (direction == NET_FILTER_DIRECTION_TX) {
556 QTAILQ_FOREACH(nf, &nc->filters, next) {
557 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov,
558 iovcnt, sent_cb);
559 if (ret) {
560 return ret;
561 }
562 }
563 } else {
564 QTAILQ_FOREACH_REVERSE(nf, &nc->filters, NetFilterHead, next) {
565 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov,
566 iovcnt, sent_cb);
567 if (ret) {
568 return ret;
569 }
570 }
571 }
572
573 return ret;
574 }
575
576 static ssize_t filter_receive(NetClientState *nc,
577 NetFilterDirection direction,
578 NetClientState *sender,
579 unsigned flags,
580 const uint8_t *data,
581 size_t size,
582 NetPacketSent *sent_cb)
583 {
584 struct iovec iov = {
585 .iov_base = (void *)data,
586 .iov_len = size
587 };
588
589 return filter_receive_iov(nc, direction, sender, flags, &iov, 1, sent_cb);
590 }
591
592 void qemu_purge_queued_packets(NetClientState *nc)
593 {
594 if (!nc->peer) {
595 return;
596 }
597
598 qemu_net_queue_purge(nc->peer->incoming_queue, nc);
599 }
600
601 static
602 void qemu_flush_or_purge_queued_packets(NetClientState *nc, bool purge)
603 {
604 nc->receive_disabled = 0;
605
606 if (nc->peer && nc->peer->info->type == NET_CLIENT_OPTIONS_KIND_HUBPORT) {
607 if (net_hub_flush(nc->peer)) {
608 qemu_notify_event();
609 }
610 }
611 if (qemu_net_queue_flush(nc->incoming_queue)) {
612 /* We emptied the queue successfully, signal to the IO thread to repoll
613 * the file descriptor (for tap, for example).
614 */
615 qemu_notify_event();
616 } else if (purge) {
617 /* Unable to empty the queue, purge remaining packets */
618 qemu_net_queue_purge(nc->incoming_queue, nc);
619 }
620 }
621
622 void qemu_flush_queued_packets(NetClientState *nc)
623 {
624 qemu_flush_or_purge_queued_packets(nc, false);
625 }
626
627 static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender,
628 unsigned flags,
629 const uint8_t *buf, int size,
630 NetPacketSent *sent_cb)
631 {
632 NetQueue *queue;
633 int ret;
634
635 #ifdef DEBUG_NET
636 printf("qemu_send_packet_async:\n");
637 qemu_hexdump((const char *)buf, stdout, "net", size);
638 #endif
639
640 if (sender->link_down || !sender->peer) {
641 return size;
642 }
643
644 /* Let filters handle the packet first */
645 ret = filter_receive(sender, NET_FILTER_DIRECTION_TX,
646 sender, flags, buf, size, sent_cb);
647 if (ret) {
648 return ret;
649 }
650
651 ret = filter_receive(sender->peer, NET_FILTER_DIRECTION_RX,
652 sender, flags, buf, size, sent_cb);
653 if (ret) {
654 return ret;
655 }
656
657 queue = sender->peer->incoming_queue;
658
659 return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb);
660 }
661
662 ssize_t qemu_send_packet_async(NetClientState *sender,
663 const uint8_t *buf, int size,
664 NetPacketSent *sent_cb)
665 {
666 return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE,
667 buf, size, sent_cb);
668 }
669
670 void qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size)
671 {
672 qemu_send_packet_async(nc, buf, size, NULL);
673 }
674
675 ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size)
676 {
677 return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW,
678 buf, size, NULL);
679 }
680
681 static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov,
682 int iovcnt, unsigned flags)
683 {
684 uint8_t *buf = NULL;
685 uint8_t *buffer;
686 size_t offset;
687 ssize_t ret;
688
689 if (iovcnt == 1) {
690 buffer = iov[0].iov_base;
691 offset = iov[0].iov_len;
692 } else {
693 buf = g_new(uint8_t, NET_BUFSIZE);
694 buffer = buf;
695 offset = iov_to_buf(iov, iovcnt, 0, buf, NET_BUFSIZE);
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
708 ssize_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) {
726 ret = nc->info->receive_iov(nc, iov, iovcnt);
727 } else {
728 ret = nc_sendv_compat(nc, iov, iovcnt, flags);
729 }
730
731 if (ret == 0) {
732 nc->receive_disabled = 1;
733 }
734
735 return ret;
736 }
737
738 ssize_t qemu_sendv_packet_async(NetClientState *sender,
739 const struct iovec *iov, int iovcnt,
740 NetPacketSent *sent_cb)
741 {
742 NetQueue *queue;
743 int ret;
744
745 if (sender->link_down || !sender->peer) {
746 return iov_size(iov, iovcnt);
747 }
748
749 /* Let filters handle the packet first */
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
769 ssize_t
770 qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt)
771 {
772 return qemu_sendv_packet_async(nc, iov, iovcnt, NULL);
773 }
774
775 NetClientState *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_OPTIONS_KIND_NIC)
781 continue;
782 if (!strcmp(nc->name, id)) {
783 return nc;
784 }
785 }
786
787 return NULL;
788 }
789
790 int qemu_find_net_clients_except(const char *id, NetClientState **ncs,
791 NetClientOptionsKind 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
811 static 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
821 int 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
835 void 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
848 int 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
865 static int net_init_nic(const NetClientOptions *opts, const char *name,
866 NetClientState *peer, Error **errp)
867 {
868 int idx;
869 NICInfo *nd;
870 const NetLegacyNicOptions *nic;
871
872 assert(opts->type == NET_CLIENT_OPTIONS_KIND_NIC);
873 nic = opts->u.nic.data;
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
933 static int (* const net_client_init_fun[NET_CLIENT_OPTIONS_KIND__MAX])(
934 const NetClientOptions *opts,
935 const char *name,
936 NetClientState *peer, Error **errp) = {
937 [NET_CLIENT_OPTIONS_KIND_NIC] = net_init_nic,
938 #ifdef CONFIG_SLIRP
939 [NET_CLIENT_OPTIONS_KIND_USER] = net_init_slirp,
940 #endif
941 [NET_CLIENT_OPTIONS_KIND_TAP] = net_init_tap,
942 [NET_CLIENT_OPTIONS_KIND_SOCKET] = net_init_socket,
943 #ifdef CONFIG_VDE
944 [NET_CLIENT_OPTIONS_KIND_VDE] = net_init_vde,
945 #endif
946 #ifdef CONFIG_NETMAP
947 [NET_CLIENT_OPTIONS_KIND_NETMAP] = net_init_netmap,
948 #endif
949 [NET_CLIENT_OPTIONS_KIND_DUMP] = net_init_dump,
950 #ifdef CONFIG_NET_BRIDGE
951 [NET_CLIENT_OPTIONS_KIND_BRIDGE] = net_init_bridge,
952 #endif
953 [NET_CLIENT_OPTIONS_KIND_HUBPORT] = net_init_hubport,
954 #ifdef CONFIG_VHOST_NET_USED
955 [NET_CLIENT_OPTIONS_KIND_VHOST_USER] = net_init_vhost_user,
956 #endif
957 #ifdef CONFIG_L2TPV3
958 [NET_CLIENT_OPTIONS_KIND_L2TPV3] = net_init_l2tpv3,
959 #endif
960 };
961
962
963 static int net_client_init1(const void *object, int is_netdev, Error **errp)
964 {
965 const NetClientOptions *opts;
966 const char *name;
967 NetClientState *peer = NULL;
968
969 if (is_netdev) {
970 const Netdev *netdev = object;
971 opts = netdev->opts;
972 name = netdev->id;
973
974 if (opts->type == NET_CLIENT_OPTIONS_KIND_DUMP ||
975 opts->type == NET_CLIENT_OPTIONS_KIND_NIC ||
976 !net_client_init_fun[opts->type]) {
977 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
978 "a netdev backend type");
979 return -1;
980 }
981 } else {
982 const NetLegacy *net = object;
983 opts = net->opts;
984 /* missing optional values have been initialized to "all bits zero" */
985 name = net->has_id ? net->id : net->name;
986
987 if (opts->type == NET_CLIENT_OPTIONS_KIND_NONE) {
988 return 0; /* nothing to do */
989 }
990 if (opts->type == NET_CLIENT_OPTIONS_KIND_HUBPORT) {
991 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
992 "a net type");
993 return -1;
994 }
995
996 if (!net_client_init_fun[opts->type]) {
997 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
998 "a net backend type (maybe it is not compiled "
999 "into this binary)");
1000 return -1;
1001 }
1002
1003 /* Do not add to a vlan if it's a nic with a netdev= parameter. */
1004 if (opts->type != NET_CLIENT_OPTIONS_KIND_NIC ||
1005 !opts->u.nic.data->has_netdev) {
1006 peer = net_hub_add_port(net->has_vlan ? net->vlan : 0, NULL);
1007 }
1008 }
1009
1010 if (net_client_init_fun[opts->type](opts, name, peer, errp) < 0) {
1011 /* FIXME drop when all init functions store an Error */
1012 if (errp && !*errp) {
1013 error_setg(errp, QERR_DEVICE_INIT_FAILED,
1014 NetClientOptionsKind_lookup[opts->type]);
1015 }
1016 return -1;
1017 }
1018 return 0;
1019 }
1020
1021
1022 int net_client_init(QemuOpts *opts, int is_netdev, Error **errp)
1023 {
1024 void *object = NULL;
1025 Error *err = NULL;
1026 int ret = -1;
1027 OptsVisitor *ov = opts_visitor_new(opts);
1028 Visitor *v = opts_get_visitor(ov);
1029
1030 {
1031 /* Parse convenience option format ip6-net=fec0::0[/64] */
1032 const char *ip6_net = qemu_opt_get(opts, "ipv6-net");
1033
1034 if (ip6_net) {
1035 char buf[strlen(ip6_net) + 1];
1036
1037 if (get_str_sep(buf, sizeof(buf), &ip6_net, '/') < 0) {
1038 /* Default 64bit prefix length. */
1039 qemu_opt_set(opts, "ipv6-prefix", ip6_net, &error_abort);
1040 qemu_opt_set_number(opts, "ipv6-prefixlen", 64, &error_abort);
1041 } else {
1042 /* User-specified prefix length. */
1043 unsigned long len;
1044 int err;
1045
1046 qemu_opt_set(opts, "ipv6-prefix", buf, &error_abort);
1047 err = qemu_strtoul(ip6_net, NULL, 10, &len);
1048
1049 if (err) {
1050 error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1051 "ipv6-prefix", "a number");
1052 } else {
1053 qemu_opt_set_number(opts, "ipv6-prefixlen", len,
1054 &error_abort);
1055 }
1056 }
1057 qemu_opt_unset(opts, "ipv6-net");
1058 }
1059 }
1060
1061 if (is_netdev) {
1062 visit_type_Netdev(v, NULL, (Netdev **)&object, &err);
1063 } else {
1064 visit_type_NetLegacy(v, NULL, (NetLegacy **)&object, &err);
1065 }
1066
1067 if (!err) {
1068 ret = net_client_init1(object, is_netdev, &err);
1069 }
1070
1071 if (is_netdev) {
1072 qapi_free_Netdev(object);
1073 } else {
1074 qapi_free_NetLegacy(object);
1075 }
1076
1077 error_propagate(errp, err);
1078 opts_visitor_cleanup(ov);
1079 return ret;
1080 }
1081
1082
1083 static int net_host_check_device(const char *device)
1084 {
1085 int i;
1086 for (i = 0; host_net_devices[i]; i++) {
1087 if (!strncmp(host_net_devices[i], device,
1088 strlen(host_net_devices[i]))) {
1089 return 1;
1090 }
1091 }
1092
1093 return 0;
1094 }
1095
1096 void hmp_host_net_add(Monitor *mon, const QDict *qdict)
1097 {
1098 const char *device = qdict_get_str(qdict, "device");
1099 const char *opts_str = qdict_get_try_str(qdict, "opts");
1100 Error *local_err = NULL;
1101 QemuOpts *opts;
1102
1103 if (!net_host_check_device(device)) {
1104 monitor_printf(mon, "invalid host network device %s\n", device);
1105 return;
1106 }
1107
1108 opts = qemu_opts_parse_noisily(qemu_find_opts("net"),
1109 opts_str ? opts_str : "", false);
1110 if (!opts) {
1111 return;
1112 }
1113
1114 qemu_opt_set(opts, "type", device, &error_abort);
1115
1116 net_client_init(opts, 0, &local_err);
1117 if (local_err) {
1118 error_report_err(local_err);
1119 monitor_printf(mon, "adding host network device %s failed\n", device);
1120 }
1121 }
1122
1123 void hmp_host_net_remove(Monitor *mon, const QDict *qdict)
1124 {
1125 NetClientState *nc;
1126 int vlan_id = qdict_get_int(qdict, "vlan_id");
1127 const char *device = qdict_get_str(qdict, "device");
1128
1129 nc = net_hub_find_client_by_name(vlan_id, device);
1130 if (!nc) {
1131 error_report("Host network device '%s' on hub '%d' not found",
1132 device, vlan_id);
1133 return;
1134 }
1135 if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
1136 error_report("invalid host network device '%s'", device);
1137 return;
1138 }
1139
1140 qemu_del_net_client(nc->peer);
1141 qemu_del_net_client(nc);
1142 }
1143
1144 void netdev_add(QemuOpts *opts, Error **errp)
1145 {
1146 net_client_init(opts, 1, errp);
1147 }
1148
1149 void qmp_netdev_add(QDict *qdict, QObject **ret, Error **errp)
1150 {
1151 Error *local_err = NULL;
1152 QemuOptsList *opts_list;
1153 QemuOpts *opts;
1154
1155 opts_list = qemu_find_opts_err("netdev", &local_err);
1156 if (local_err) {
1157 goto out;
1158 }
1159
1160 opts = qemu_opts_from_qdict(opts_list, qdict, &local_err);
1161 if (local_err) {
1162 goto out;
1163 }
1164
1165 netdev_add(opts, &local_err);
1166 if (local_err) {
1167 qemu_opts_del(opts);
1168 goto out;
1169 }
1170
1171 out:
1172 error_propagate(errp, local_err);
1173 }
1174
1175 void qmp_netdev_del(const char *id, Error **errp)
1176 {
1177 NetClientState *nc;
1178 QemuOpts *opts;
1179
1180 nc = qemu_find_netdev(id);
1181 if (!nc) {
1182 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1183 "Device '%s' not found", id);
1184 return;
1185 }
1186
1187 opts = qemu_opts_find(qemu_find_opts_err("netdev", NULL), id);
1188 if (!opts) {
1189 error_setg(errp, "Device '%s' is not a netdev", id);
1190 return;
1191 }
1192
1193 qemu_del_net_client(nc);
1194 qemu_opts_del(opts);
1195 }
1196
1197 static void netfilter_print_info(Monitor *mon, NetFilterState *nf)
1198 {
1199 char *str;
1200 ObjectProperty *prop;
1201 ObjectPropertyIterator iter;
1202 StringOutputVisitor *ov;
1203
1204 /* generate info str */
1205 object_property_iter_init(&iter, OBJECT(nf));
1206 while ((prop = object_property_iter_next(&iter))) {
1207 if (!strcmp(prop->name, "type")) {
1208 continue;
1209 }
1210 ov = string_output_visitor_new(false);
1211 object_property_get(OBJECT(nf), string_output_get_visitor(ov),
1212 prop->name, NULL);
1213 str = string_output_get_string(ov);
1214 string_output_visitor_cleanup(ov);
1215 monitor_printf(mon, ",%s=%s", prop->name, str);
1216 g_free(str);
1217 }
1218 monitor_printf(mon, "\n");
1219 }
1220
1221 void print_net_client(Monitor *mon, NetClientState *nc)
1222 {
1223 NetFilterState *nf;
1224
1225 monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name,
1226 nc->queue_index,
1227 NetClientOptionsKind_lookup[nc->info->type],
1228 nc->info_str);
1229 if (!QTAILQ_EMPTY(&nc->filters)) {
1230 monitor_printf(mon, "filters:\n");
1231 }
1232 QTAILQ_FOREACH(nf, &nc->filters, next) {
1233 char *path = object_get_canonical_path_component(OBJECT(nf));
1234
1235 monitor_printf(mon, " - %s: type=%s", path,
1236 object_get_typename(OBJECT(nf)));
1237 netfilter_print_info(mon, nf);
1238 g_free(path);
1239 }
1240 }
1241
1242 RxFilterInfoList *qmp_query_rx_filter(bool has_name, const char *name,
1243 Error **errp)
1244 {
1245 NetClientState *nc;
1246 RxFilterInfoList *filter_list = NULL, *last_entry = NULL;
1247
1248 QTAILQ_FOREACH(nc, &net_clients, next) {
1249 RxFilterInfoList *entry;
1250 RxFilterInfo *info;
1251
1252 if (has_name && strcmp(nc->name, name) != 0) {
1253 continue;
1254 }
1255
1256 /* only query rx-filter information of NIC */
1257 if (nc->info->type != NET_CLIENT_OPTIONS_KIND_NIC) {
1258 if (has_name) {
1259 error_setg(errp, "net client(%s) isn't a NIC", name);
1260 return NULL;
1261 }
1262 continue;
1263 }
1264
1265 /* only query information on queue 0 since the info is per nic,
1266 * not per queue
1267 */
1268 if (nc->queue_index != 0)
1269 continue;
1270
1271 if (nc->info->query_rx_filter) {
1272 info = nc->info->query_rx_filter(nc);
1273 entry = g_malloc0(sizeof(*entry));
1274 entry->value = info;
1275
1276 if (!filter_list) {
1277 filter_list = entry;
1278 } else {
1279 last_entry->next = entry;
1280 }
1281 last_entry = entry;
1282 } else if (has_name) {
1283 error_setg(errp, "net client(%s) doesn't support"
1284 " rx-filter querying", name);
1285 return NULL;
1286 }
1287
1288 if (has_name) {
1289 break;
1290 }
1291 }
1292
1293 if (filter_list == NULL && has_name) {
1294 error_setg(errp, "invalid net client name: %s", name);
1295 }
1296
1297 return filter_list;
1298 }
1299
1300 void hmp_info_network(Monitor *mon, const QDict *qdict)
1301 {
1302 NetClientState *nc, *peer;
1303 NetClientOptionsKind type;
1304
1305 net_hub_info(mon);
1306
1307 QTAILQ_FOREACH(nc, &net_clients, next) {
1308 peer = nc->peer;
1309 type = nc->info->type;
1310
1311 /* Skip if already printed in hub info */
1312 if (net_hub_id_for_client(nc, NULL) == 0) {
1313 continue;
1314 }
1315
1316 if (!peer || type == NET_CLIENT_OPTIONS_KIND_NIC) {
1317 print_net_client(mon, nc);
1318 } /* else it's a netdev connected to a NIC, printed with the NIC */
1319 if (peer && type == NET_CLIENT_OPTIONS_KIND_NIC) {
1320 monitor_printf(mon, " \\ ");
1321 print_net_client(mon, peer);
1322 }
1323 }
1324 }
1325
1326 void qmp_set_link(const char *name, bool up, Error **errp)
1327 {
1328 NetClientState *ncs[MAX_QUEUE_NUM];
1329 NetClientState *nc;
1330 int queues, i;
1331
1332 queues = qemu_find_net_clients_except(name, ncs,
1333 NET_CLIENT_OPTIONS_KIND__MAX,
1334 MAX_QUEUE_NUM);
1335
1336 if (queues == 0) {
1337 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1338 "Device '%s' not found", name);
1339 return;
1340 }
1341 nc = ncs[0];
1342
1343 for (i = 0; i < queues; i++) {
1344 ncs[i]->link_down = !up;
1345 }
1346
1347 if (nc->info->link_status_changed) {
1348 nc->info->link_status_changed(nc);
1349 }
1350
1351 if (nc->peer) {
1352 /* Change peer link only if the peer is NIC and then notify peer.
1353 * If the peer is a HUBPORT or a backend, we do not change the
1354 * link status.
1355 *
1356 * This behavior is compatible with qemu vlans where there could be
1357 * multiple clients that can still communicate with each other in
1358 * disconnected mode. For now maintain this compatibility.
1359 */
1360 if (nc->peer->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
1361 for (i = 0; i < queues; i++) {
1362 ncs[i]->peer->link_down = !up;
1363 }
1364 }
1365 if (nc->peer->info->link_status_changed) {
1366 nc->peer->info->link_status_changed(nc->peer);
1367 }
1368 }
1369 }
1370
1371 static void net_vm_change_state_handler(void *opaque, int running,
1372 RunState state)
1373 {
1374 NetClientState *nc;
1375 NetClientState *tmp;
1376
1377 QTAILQ_FOREACH_SAFE(nc, &net_clients, next, tmp) {
1378 if (running) {
1379 /* Flush queued packets and wake up backends. */
1380 if (nc->peer && qemu_can_send_packet(nc)) {
1381 qemu_flush_queued_packets(nc->peer);
1382 }
1383 } else {
1384 /* Complete all queued packets, to guarantee we don't modify
1385 * state later when VM is not running.
1386 */
1387 qemu_flush_or_purge_queued_packets(nc, true);
1388 }
1389 }
1390 }
1391
1392 void net_cleanup(void)
1393 {
1394 NetClientState *nc;
1395
1396 /* We may del multiple entries during qemu_del_net_client(),
1397 * so QTAILQ_FOREACH_SAFE() is also not safe here.
1398 */
1399 while (!QTAILQ_EMPTY(&net_clients)) {
1400 nc = QTAILQ_FIRST(&net_clients);
1401 if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
1402 qemu_del_nic(qemu_get_nic(nc));
1403 } else {
1404 qemu_del_net_client(nc);
1405 }
1406 }
1407
1408 qemu_del_vm_change_state_handler(net_change_state_entry);
1409 }
1410
1411 void net_check_clients(void)
1412 {
1413 NetClientState *nc;
1414 int i;
1415
1416 net_hub_check_clients();
1417
1418 QTAILQ_FOREACH(nc, &net_clients, next) {
1419 if (!nc->peer) {
1420 fprintf(stderr, "Warning: %s %s has no peer\n",
1421 nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC ?
1422 "nic" : "netdev", nc->name);
1423 }
1424 }
1425
1426 /* Check that all NICs requested via -net nic actually got created.
1427 * NICs created via -device don't need to be checked here because
1428 * they are always instantiated.
1429 */
1430 for (i = 0; i < MAX_NICS; i++) {
1431 NICInfo *nd = &nd_table[i];
1432 if (nd->used && !nd->instantiated) {
1433 fprintf(stderr, "Warning: requested NIC (%s, model %s) "
1434 "was not created (not supported by this machine?)\n",
1435 nd->name ? nd->name : "anonymous",
1436 nd->model ? nd->model : "unspecified");
1437 }
1438 }
1439 }
1440
1441 static int net_init_client(void *dummy, QemuOpts *opts, Error **errp)
1442 {
1443 Error *local_err = NULL;
1444
1445 net_client_init(opts, 0, &local_err);
1446 if (local_err) {
1447 error_report_err(local_err);
1448 return -1;
1449 }
1450
1451 return 0;
1452 }
1453
1454 static int net_init_netdev(void *dummy, QemuOpts *opts, Error **errp)
1455 {
1456 Error *local_err = NULL;
1457 int ret;
1458
1459 ret = net_client_init(opts, 1, &local_err);
1460 if (local_err) {
1461 error_report_err(local_err);
1462 return -1;
1463 }
1464
1465 return ret;
1466 }
1467
1468 int net_init_clients(void)
1469 {
1470 QemuOptsList *net = qemu_find_opts("net");
1471
1472 net_change_state_entry =
1473 qemu_add_vm_change_state_handler(net_vm_change_state_handler, NULL);
1474
1475 QTAILQ_INIT(&net_clients);
1476
1477 if (qemu_opts_foreach(qemu_find_opts("netdev"),
1478 net_init_netdev, NULL, NULL)) {
1479 return -1;
1480 }
1481
1482 if (qemu_opts_foreach(net, net_init_client, NULL, NULL)) {
1483 return -1;
1484 }
1485
1486 return 0;
1487 }
1488
1489 int net_client_parse(QemuOptsList *opts_list, const char *optarg)
1490 {
1491 #if defined(CONFIG_SLIRP)
1492 int ret;
1493 if (net_slirp_parse_legacy(opts_list, optarg, &ret)) {
1494 return ret;
1495 }
1496 #endif
1497
1498 if (!qemu_opts_parse_noisily(opts_list, optarg, true)) {
1499 return -1;
1500 }
1501
1502 return 0;
1503 }
1504
1505 /* From FreeBSD */
1506 /* XXX: optimize */
1507 unsigned compute_mcast_idx(const uint8_t *ep)
1508 {
1509 uint32_t crc;
1510 int carry, i, j;
1511 uint8_t b;
1512
1513 crc = 0xffffffff;
1514 for (i = 0; i < 6; i++) {
1515 b = *ep++;
1516 for (j = 0; j < 8; j++) {
1517 carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01);
1518 crc <<= 1;
1519 b >>= 1;
1520 if (carry) {
1521 crc = ((crc ^ POLYNOMIAL) | carry);
1522 }
1523 }
1524 }
1525 return crc >> 26;
1526 }
1527
1528 QemuOptsList qemu_netdev_opts = {
1529 .name = "netdev",
1530 .implied_opt_name = "type",
1531 .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head),
1532 .desc = {
1533 /*
1534 * no elements => accept any params
1535 * validation will happen later
1536 */
1537 { /* end of list */ }
1538 },
1539 };
1540
1541 QemuOptsList qemu_net_opts = {
1542 .name = "net",
1543 .implied_opt_name = "type",
1544 .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head),
1545 .desc = {
1546 /*
1547 * no elements => accept any params
1548 * validation will happen later
1549 */
1550 { /* end of list */ }
1551 },
1552 };
1553
1554 void net_socket_rs_init(SocketReadState *rs,
1555 SocketReadStateFinalize *finalize)
1556 {
1557 rs->state = 0;
1558 rs->index = 0;
1559 rs->packet_len = 0;
1560 memset(rs->buf, 0, sizeof(rs->buf));
1561 rs->finalize = finalize;
1562 }
1563
1564 /*
1565 * Returns
1566 * 0: SocketReadState is not ready
1567 * 1: SocketReadState is ready
1568 * otherwise error occurs
1569 */
1570 int net_fill_rstate(SocketReadState *rs, const uint8_t *buf, int size)
1571 {
1572 unsigned int l;
1573
1574 while (size > 0) {
1575 /* reassemble a packet from the network */
1576 switch (rs->state) { /* 0 = getting length, 1 = getting data */
1577 case 0:
1578 l = 4 - rs->index;
1579 if (l > size) {
1580 l = size;
1581 }
1582 memcpy(rs->buf + rs->index, buf, l);
1583 buf += l;
1584 size -= l;
1585 rs->index += l;
1586 if (rs->index == 4) {
1587 /* got length */
1588 rs->packet_len = ntohl(*(uint32_t *)rs->buf);
1589 rs->index = 0;
1590 rs->state = 1;
1591 }
1592 break;
1593 case 1:
1594 l = rs->packet_len - rs->index;
1595 if (l > size) {
1596 l = size;
1597 }
1598 if (rs->index + l <= sizeof(rs->buf)) {
1599 memcpy(rs->buf + rs->index, buf, l);
1600 } else {
1601 fprintf(stderr, "serious error: oversized packet received,"
1602 "connection terminated.\n");
1603 rs->index = rs->state = 0;
1604 return -1;
1605 }
1606
1607 rs->index += l;
1608 buf += l;
1609 size -= l;
1610 if (rs->index >= rs->packet_len) {
1611 rs->index = 0;
1612 rs->state = 0;
1613 if (rs->finalize) {
1614 rs->finalize(rs);
1615 }
1616 return 1;
1617 }
1618 break;
1619 }
1620 }
1621 return 0;
1622 }