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
25#include "qemu/osdep.h"
26
27#include "net/net.h"
28#include "clients.h"
29#include "hub.h"
30#include "hw/qdev-properties.h"
31#include "net/slirp.h"
32#include "net/eth.h"
33#include "util.h"
34
35#include "monitor/monitor.h"
36#include "qemu/help_option.h"
37#include "qapi/qapi-commands-net.h"
38#include "qapi/qapi-visit-net.h"
39#include "qapi/qmp/qdict.h"
40#include "qapi/qmp/qerror.h"
41#include "qemu/error-report.h"
42#include "qemu/sockets.h"
43#include "qemu/cutils.h"
44#include "qemu/config-file.h"
45#include "qemu/ctype.h"
46#include "qemu/iov.h"
47#include "qemu/main-loop.h"
48#include "qemu/option.h"
49#include "qapi/error.h"
50#include "qapi/opts-visitor.h"
51#include "sysemu/sysemu.h"
52#include "sysemu/qtest.h"
53#include "sysemu/runstate.h"
54#include "sysemu/sysemu.h"
55#include "net/filter.h"
56#include "qapi/string-output-visitor.h"
57
58/* Net bridge is currently not supported for W32. */
59#if !defined(_WIN32)
60# define CONFIG_NET_BRIDGE
61#endif
62
63static VMChangeStateEntry *net_change_state_entry;
64static QTAILQ_HEAD(, NetClientState) net_clients;
65
66/***********************************************************/
67/* network device redirectors */
68
69int parse_host_port(struct sockaddr_in *saddr, const char *str,
70 Error **errp)
71{
72 gchar **substrings;
73 struct hostent *he;
74 const char *addr, *p, *r;
75 int port, ret = 0;
76
77 substrings = g_strsplit(str, ":", 2);
78 if (!substrings || !substrings[0] || !substrings[1]) {
79 error_setg(errp, "host address '%s' doesn't contain ':' "
80 "separating host from port", str);
81 ret = -1;
82 goto out;
83 }
84
85 addr = substrings[0];
86 p = substrings[1];
87
88 saddr->sin_family = AF_INET;
89 if (addr[0] == '\0') {
90 saddr->sin_addr.s_addr = 0;
91 } else {
92 if (qemu_isdigit(addr[0])) {
93 if (!inet_aton(addr, &saddr->sin_addr)) {
94 error_setg(errp, "host address '%s' is not a valid "
95 "IPv4 address", addr);
96 ret = -1;
97 goto out;
98 }
99 } else {
100 he = gethostbyname(addr);
101 if (he == NULL) {
102 error_setg(errp, "can't resolve host address '%s'", addr);
103 ret = -1;
104 goto out;
105 }
106 saddr->sin_addr = *(struct in_addr *)he->h_addr;
107 }
108 }
109 port = strtol(p, (char **)&r, 0);
110 if (r == p) {
111 error_setg(errp, "port number '%s' is invalid", p);
112 ret = -1;
113 goto out;
114 }
115 saddr->sin_port = htons(port);
116
117out:
118 g_strfreev(substrings);
119 return ret;
120}
121
122char *qemu_mac_strdup_printf(const uint8_t *macaddr)
123{
124 return g_strdup_printf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x",
125 macaddr[0], macaddr[1], macaddr[2],
126 macaddr[3], macaddr[4], macaddr[5]);
127}
128
129void qemu_format_nic_info_str(NetClientState *nc, uint8_t macaddr[6])
130{
131 snprintf(nc->info_str, sizeof(nc->info_str),
132 "model=%s,macaddr=%02x:%02x:%02x:%02x:%02x:%02x",
133 nc->model,
134 macaddr[0], macaddr[1], macaddr[2],
135 macaddr[3], macaddr[4], macaddr[5]);
136}
137
138static int mac_table[256] = {0};
139
140static void qemu_macaddr_set_used(MACAddr *macaddr)
141{
142 int index;
143
144 for (index = 0x56; index < 0xFF; index++) {
145 if (macaddr->a[5] == index) {
146 mac_table[index]++;
147 }
148 }
149}
150
151static void qemu_macaddr_set_free(MACAddr *macaddr)
152{
153 int index;
154 static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } };
155
156 if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) {
157 return;
158 }
159 for (index = 0x56; index < 0xFF; index++) {
160 if (macaddr->a[5] == index) {
161 mac_table[index]--;
162 }
163 }
164}
165
166static int qemu_macaddr_get_free(void)
167{
168 int index;
169
170 for (index = 0x56; index < 0xFF; index++) {
171 if (mac_table[index] == 0) {
172 return index;
173 }
174 }
175
176 return -1;
177}
178
179void qemu_macaddr_default_if_unset(MACAddr *macaddr)
180{
181 static const MACAddr zero = { .a = { 0,0,0,0,0,0 } };
182 static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } };
183
184 if (memcmp(macaddr, &zero, sizeof(zero)) != 0) {
185 if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) {
186 return;
187 } else {
188 qemu_macaddr_set_used(macaddr);
189 return;
190 }
191 }
192
193 macaddr->a[0] = 0x52;
194 macaddr->a[1] = 0x54;
195 macaddr->a[2] = 0x00;
196 macaddr->a[3] = 0x12;
197 macaddr->a[4] = 0x34;
198 macaddr->a[5] = qemu_macaddr_get_free();
199 qemu_macaddr_set_used(macaddr);
200}
201
202/**
203 * Generate a name for net client
204 *
205 * Only net clients created with the legacy -net option and NICs need this.
206 */
207static char *assign_name(NetClientState *nc1, const char *model)
208{
209 NetClientState *nc;
210 int id = 0;
211
212 QTAILQ_FOREACH(nc, &net_clients, next) {
213 if (nc == nc1) {
214 continue;
215 }
216 if (strcmp(nc->model, model) == 0) {
217 id++;
218 }
219 }
220
221 return g_strdup_printf("%s.%d", model, id);
222}
223
224static void qemu_net_client_destructor(NetClientState *nc)
225{
226 g_free(nc);
227}
228static ssize_t qemu_deliver_packet_iov(NetClientState *sender,
229 unsigned flags,
230 const struct iovec *iov,
231 int iovcnt,
232 void *opaque);
233
234static void qemu_net_client_setup(NetClientState *nc,
235 NetClientInfo *info,
236 NetClientState *peer,
237 const char *model,
238 const char *name,
239 NetClientDestructor *destructor)
240{
241 nc->info = info;
242 nc->model = g_strdup(model);
243 if (name) {
244 nc->name = g_strdup(name);
245 } else {
246 nc->name = assign_name(nc, model);
247 }
248
249 if (peer) {
250 assert(!peer->peer);
251 nc->peer = peer;
252 peer->peer = nc;
253 }
254 QTAILQ_INSERT_TAIL(&net_clients, nc, next);
255
256 nc->incoming_queue = qemu_new_net_queue(qemu_deliver_packet_iov, nc);
257 nc->destructor = destructor;
258 QTAILQ_INIT(&nc->filters);
259}
260
261NetClientState *qemu_new_net_client(NetClientInfo *info,
262 NetClientState *peer,
263 const char *model,
264 const char *name)
265{
266 NetClientState *nc;
267
268 assert(info->size >= sizeof(NetClientState));
269
270 nc = g_malloc0(info->size);
271 qemu_net_client_setup(nc, info, peer, model, name,
272 qemu_net_client_destructor);
273
274 return nc;
275}
276
277NICState *qemu_new_nic(NetClientInfo *info,
278 NICConf *conf,
279 const char *model,
280 const char *name,
281 void *opaque)
282{
283 NetClientState **peers = conf->peers.ncs;
284 NICState *nic;
285 int i, queues = MAX(1, conf->peers.queues);
286
287 assert(info->type == NET_CLIENT_DRIVER_NIC);
288 assert(info->size >= sizeof(NICState));
289
290 nic = g_malloc0(info->size + sizeof(NetClientState) * queues);
291 nic->ncs = (void *)nic + info->size;
292 nic->conf = conf;
293 nic->opaque = opaque;
294
295 for (i = 0; i < queues; i++) {
296 qemu_net_client_setup(&nic->ncs[i], info, peers[i], model, name,
297 NULL);
298 nic->ncs[i].queue_index = i;
299 }
300
301 return nic;
302}
303
304NetClientState *qemu_get_subqueue(NICState *nic, int queue_index)
305{
306 return nic->ncs + queue_index;
307}
308
309NetClientState *qemu_get_queue(NICState *nic)
310{
311 return qemu_get_subqueue(nic, 0);
312}
313
314NICState *qemu_get_nic(NetClientState *nc)
315{
316 NetClientState *nc0 = nc - nc->queue_index;
317
318 return (NICState *)((void *)nc0 - nc->info->size);
319}
320
321void *qemu_get_nic_opaque(NetClientState *nc)
322{
323 NICState *nic = qemu_get_nic(nc);
324
325 return nic->opaque;
326}
327
328static void qemu_cleanup_net_client(NetClientState *nc)
329{
330 QTAILQ_REMOVE(&net_clients, nc, next);
331
332 if (nc->info->cleanup) {
333 nc->info->cleanup(nc);
334 }
335}
336
337static void qemu_free_net_client(NetClientState *nc)
338{
339 if (nc->incoming_queue) {
340 qemu_del_net_queue(nc->incoming_queue);
341 }
342 if (nc->peer) {
343 nc->peer->peer = NULL;
344 }
345 g_free(nc->name);
346 g_free(nc->model);
347 if (nc->destructor) {
348 nc->destructor(nc);
349 }
350}
351
352void qemu_del_net_client(NetClientState *nc)
353{
354 NetClientState *ncs[MAX_QUEUE_NUM];
355 int queues, i;
356 NetFilterState *nf, *next;
357
358 assert(nc->info->type != NET_CLIENT_DRIVER_NIC);
359
360 /* If the NetClientState belongs to a multiqueue backend, we will change all
361 * other NetClientStates also.
362 */
363 queues = qemu_find_net_clients_except(nc->name, ncs,
364 NET_CLIENT_DRIVER_NIC,
365 MAX_QUEUE_NUM);
366 assert(queues != 0);
367
368 QTAILQ_FOREACH_SAFE(nf, &nc->filters, next, next) {
369 object_unparent(OBJECT(nf));
370 }
371
372 /* If there is a peer NIC, delete and cleanup client, but do not free. */
373 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_NIC) {
374 NICState *nic = qemu_get_nic(nc->peer);
375 if (nic->peer_deleted) {
376 return;
377 }
378 nic->peer_deleted = true;
379
380 for (i = 0; i < queues; i++) {
381 ncs[i]->peer->link_down = true;
382 }
383
384 if (nc->peer->info->link_status_changed) {
385 nc->peer->info->link_status_changed(nc->peer);
386 }
387
388 for (i = 0; i < queues; i++) {
389 qemu_cleanup_net_client(ncs[i]);
390 }
391
392 return;
393 }
394
395 for (i = 0; i < queues; i++) {
396 qemu_cleanup_net_client(ncs[i]);
397 qemu_free_net_client(ncs[i]);
398 }
399}
400
401void qemu_del_nic(NICState *nic)
402{
403 int i, queues = MAX(nic->conf->peers.queues, 1);
404
405 qemu_macaddr_set_free(&nic->conf->macaddr);
406
407 /* If this is a peer NIC and peer has already been deleted, free it now. */
408 if (nic->peer_deleted) {
409 for (i = 0; i < queues; i++) {
410 qemu_free_net_client(qemu_get_subqueue(nic, i)->peer);
411 }
412 }
413
414 for (i = queues - 1; i >= 0; i--) {
415 NetClientState *nc = qemu_get_subqueue(nic, i);
416
417 qemu_cleanup_net_client(nc);
418 qemu_free_net_client(nc);
419 }
420
421 g_free(nic);
422}
423
424void qemu_foreach_nic(qemu_nic_foreach func, void *opaque)
425{
426 NetClientState *nc;
427
428 QTAILQ_FOREACH(nc, &net_clients, next) {
429 if (nc->info->type == NET_CLIENT_DRIVER_NIC) {
430 if (nc->queue_index == 0) {
431 func(qemu_get_nic(nc), opaque);
432 }
433 }
434 }
435}
436
437bool qemu_has_ufo(NetClientState *nc)
438{
439 if (!nc || !nc->info->has_ufo) {
440 return false;
441 }
442
443 return nc->info->has_ufo(nc);
444}
445
446bool qemu_has_vnet_hdr(NetClientState *nc)
447{
448 if (!nc || !nc->info->has_vnet_hdr) {
449 return false;
450 }
451
452 return nc->info->has_vnet_hdr(nc);
453}
454
455bool qemu_has_vnet_hdr_len(NetClientState *nc, int len)
456{
457 if (!nc || !nc->info->has_vnet_hdr_len) {
458 return false;
459 }
460
461 return nc->info->has_vnet_hdr_len(nc, len);
462}
463
464void qemu_using_vnet_hdr(NetClientState *nc, bool enable)
465{
466 if (!nc || !nc->info->using_vnet_hdr) {
467 return;
468 }
469
470 nc->info->using_vnet_hdr(nc, enable);
471}
472
473void qemu_set_offload(NetClientState *nc, int csum, int tso4, int tso6,
474 int ecn, int ufo)
475{
476 if (!nc || !nc->info->set_offload) {
477 return;
478 }
479
480 nc->info->set_offload(nc, csum, tso4, tso6, ecn, ufo);
481}
482
483void qemu_set_vnet_hdr_len(NetClientState *nc, int len)
484{
485 if (!nc || !nc->info->set_vnet_hdr_len) {
486 return;
487 }
488
489 nc->vnet_hdr_len = len;
490 nc->info->set_vnet_hdr_len(nc, len);
491}
492
493int qemu_set_vnet_le(NetClientState *nc, bool is_le)
494{
495#ifdef HOST_WORDS_BIGENDIAN
496 if (!nc || !nc->info->set_vnet_le) {
497 return -ENOSYS;
498 }
499
500 return nc->info->set_vnet_le(nc, is_le);
501#else
502 return 0;
503#endif
504}
505
506int qemu_set_vnet_be(NetClientState *nc, bool is_be)
507{
508#ifdef HOST_WORDS_BIGENDIAN
509 return 0;
510#else
511 if (!nc || !nc->info->set_vnet_be) {
512 return -ENOSYS;
513 }
514
515 return nc->info->set_vnet_be(nc, is_be);
516#endif
517}
518
519int qemu_can_send_packet(NetClientState *sender)
520{
521 int vm_running = runstate_is_running();
522
523 if (!vm_running) {
524 return 0;
525 }
526
527 if (!sender->peer) {
528 return 1;
529 }
530
531 if (sender->peer->receive_disabled) {
532 return 0;
533 } else if (sender->peer->info->can_receive &&
534 !sender->peer->info->can_receive(sender->peer)) {
535 return 0;
536 }
537 return 1;
538}
539
540static ssize_t filter_receive_iov(NetClientState *nc,
541 NetFilterDirection direction,
542 NetClientState *sender,
543 unsigned flags,
544 const struct iovec *iov,
545 int iovcnt,
546 NetPacketSent *sent_cb)
547{
548 ssize_t ret = 0;
549 NetFilterState *nf = NULL;
550
551 if (direction == NET_FILTER_DIRECTION_TX) {
552 QTAILQ_FOREACH(nf, &nc->filters, next) {
553 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov,
554 iovcnt, sent_cb);
555 if (ret) {
556 return ret;
557 }
558 }
559 } else {
560 QTAILQ_FOREACH_REVERSE(nf, &nc->filters, next) {
561 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov,
562 iovcnt, sent_cb);
563 if (ret) {
564 return ret;
565 }
566 }
567 }
568
569 return ret;
570}
571
572static ssize_t filter_receive(NetClientState *nc,
573 NetFilterDirection direction,
574 NetClientState *sender,
575 unsigned flags,
576 const uint8_t *data,
577 size_t size,
578 NetPacketSent *sent_cb)
579{
580 struct iovec iov = {
581 .iov_base = (void *)data,
582 .iov_len = size
583 };
584
585 return filter_receive_iov(nc, direction, sender, flags, &iov, 1, sent_cb);
586}
587
588void qemu_purge_queued_packets(NetClientState *nc)
589{
590 if (!nc->peer) {
591 return;
592 }
593
594 qemu_net_queue_purge(nc->peer->incoming_queue, nc);
595}
596
597void qemu_flush_or_purge_queued_packets(NetClientState *nc, bool purge)
598{
599 nc->receive_disabled = 0;
600
601 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_HUBPORT) {
602 if (net_hub_flush(nc->peer)) {
603 qemu_notify_event();
604 }
605 }
606 if (qemu_net_queue_flush(nc->incoming_queue)) {
607 /* We emptied the queue successfully, signal to the IO thread to repoll
608 * the file descriptor (for tap, for example).
609 */
610 qemu_notify_event();
611 } else if (purge) {
612 /* Unable to empty the queue, purge remaining packets */
613 qemu_net_queue_purge(nc->incoming_queue, nc);
614 }
615}
616
617void qemu_flush_queued_packets(NetClientState *nc)
618{
619 qemu_flush_or_purge_queued_packets(nc, false);
620}
621
622static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender,
623 unsigned flags,
624 const uint8_t *buf, int size,
625 NetPacketSent *sent_cb)
626{
627 NetQueue *queue;
628 int ret;
629
630#ifdef DEBUG_NET
631 printf("qemu_send_packet_async:\n");
632 qemu_hexdump((const char *)buf, stdout, "net", size);
633#endif
634
635 if (sender->link_down || !sender->peer) {
636 return size;
637 }
638
639 /* Let filters handle the packet first */
640 ret = filter_receive(sender, NET_FILTER_DIRECTION_TX,
641 sender, flags, buf, size, sent_cb);
642 if (ret) {
643 return ret;
644 }
645
646 ret = filter_receive(sender->peer, NET_FILTER_DIRECTION_RX,
647 sender, flags, buf, size, sent_cb);
648 if (ret) {
649 return ret;
650 }
651
652 queue = sender->peer->incoming_queue;
653
654 return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb);
655}
656
657ssize_t qemu_send_packet_async(NetClientState *sender,
658 const uint8_t *buf, int size,
659 NetPacketSent *sent_cb)
660{
661 return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE,
662 buf, size, sent_cb);
663}
664
665ssize_t qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size)
666{
667 return qemu_send_packet_async(nc, buf, size, NULL);
668}
669
670ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size)
671{
672 return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW,
673 buf, size, NULL);
674}
675
676static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov,
677 int iovcnt, unsigned flags)
678{
679 uint8_t *buf = NULL;
680 uint8_t *buffer;
681 size_t offset;
682 ssize_t ret;
683
684 if (iovcnt == 1) {
685 buffer = iov[0].iov_base;
686 offset = iov[0].iov_len;
687 } else {
688 offset = iov_size(iov, iovcnt);
689 if (offset > NET_BUFSIZE) {
690 return -1;
691 }
692 buf = g_malloc(offset);
693 buffer = buf;
694 offset = iov_to_buf(iov, iovcnt, 0, buf, offset);
695 }
696
697 if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) {
698 ret = nc->info->receive_raw(nc, buffer, offset);
699 } else {
700 ret = nc->info->receive(nc, buffer, offset);
701 }
702
703 g_free(buf);
704 return ret;
705}
706
707static ssize_t qemu_deliver_packet_iov(NetClientState *sender,
708 unsigned flags,
709 const struct iovec *iov,
710 int iovcnt,
711 void *opaque)
712{
713 NetClientState *nc = opaque;
714 int ret;
715
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 size_t size = iov_size(iov, iovcnt);
744 int ret;
745
746 if (size > NET_BUFSIZE) {
747 return size;
748 }
749
750 if (sender->link_down || !sender->peer) {
751 return size;
752 }
753
754 /* Let filters handle the packet first */
755 ret = filter_receive_iov(sender, NET_FILTER_DIRECTION_TX, sender,
756 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb);
757 if (ret) {
758 return ret;
759 }
760
761 ret = filter_receive_iov(sender->peer, NET_FILTER_DIRECTION_RX, sender,
762 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb);
763 if (ret) {
764 return ret;
765 }
766
767 queue = sender->peer->incoming_queue;
768
769 return qemu_net_queue_send_iov(queue, sender,
770 QEMU_NET_PACKET_FLAG_NONE,
771 iov, iovcnt, sent_cb);
772}
773
774ssize_t
775qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt)
776{
777 return qemu_sendv_packet_async(nc, iov, iovcnt, NULL);
778}
779
780NetClientState *qemu_find_netdev(const char *id)
781{
782 NetClientState *nc;
783
784 QTAILQ_FOREACH(nc, &net_clients, next) {
785 if (nc->info->type == NET_CLIENT_DRIVER_NIC)
786 continue;
787 if (!strcmp(nc->name, id)) {
788 return nc;
789 }
790 }
791
792 return NULL;
793}
794
795int qemu_find_net_clients_except(const char *id, NetClientState **ncs,
796 NetClientDriver type, int max)
797{
798 NetClientState *nc;
799 int ret = 0;
800
801 QTAILQ_FOREACH(nc, &net_clients, next) {
802 if (nc->info->type == type) {
803 continue;
804 }
805 if (!id || !strcmp(nc->name, id)) {
806 if (ret < max) {
807 ncs[ret] = nc;
808 }
809 ret++;
810 }
811 }
812
813 return ret;
814}
815
816static int nic_get_free_idx(void)
817{
818 int index;
819
820 for (index = 0; index < MAX_NICS; index++)
821 if (!nd_table[index].used)
822 return index;
823 return -1;
824}
825
826int qemu_show_nic_models(const char *arg, const char *const *models)
827{
828 int i;
829
830 if (!arg || !is_help_option(arg)) {
831 return 0;
832 }
833
834 printf("Supported NIC models:\n");
835 for (i = 0 ; models[i]; i++) {
836 printf("%s\n", models[i]);
837 }
838 return 1;
839}
840
841void qemu_check_nic_model(NICInfo *nd, const char *model)
842{
843 const char *models[2];
844
845 models[0] = model;
846 models[1] = NULL;
847
848 if (qemu_show_nic_models(nd->model, models))
849 exit(0);
850 if (qemu_find_nic_model(nd, models, model) < 0)
851 exit(1);
852}
853
854int qemu_find_nic_model(NICInfo *nd, const char * const *models,
855 const char *default_model)
856{
857 int i;
858
859 if (!nd->model)
860 nd->model = g_strdup(default_model);
861
862 for (i = 0 ; models[i]; i++) {
863 if (strcmp(nd->model, models[i]) == 0)
864 return i;
865 }
866
867 error_report("Unsupported NIC model: %s", nd->model);
868 return -1;
869}
870
871static int net_init_nic(const Netdev *netdev, const char *name,
872 NetClientState *peer, Error **errp)
873{
874 int idx;
875 NICInfo *nd;
876 const NetLegacyNicOptions *nic;
877
878 assert(netdev->type == NET_CLIENT_DRIVER_NIC);
879 nic = &netdev->u.nic;
880
881 idx = nic_get_free_idx();
882 if (idx == -1 || nb_nics >= MAX_NICS) {
883 error_setg(errp, "too many NICs");
884 return -1;
885 }
886
887 nd = &nd_table[idx];
888
889 memset(nd, 0, sizeof(*nd));
890
891 if (nic->has_netdev) {
892 nd->netdev = qemu_find_netdev(nic->netdev);
893 if (!nd->netdev) {
894 error_setg(errp, "netdev '%s' not found", nic->netdev);
895 return -1;
896 }
897 } else {
898 assert(peer);
899 nd->netdev = peer;
900 }
901 nd->name = g_strdup(name);
902 if (nic->has_model) {
903 nd->model = g_strdup(nic->model);
904 }
905 if (nic->has_addr) {
906 nd->devaddr = g_strdup(nic->addr);
907 }
908
909 if (nic->has_macaddr &&
910 net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) {
911 error_setg(errp, "invalid syntax for ethernet address");
912 return -1;
913 }
914 if (nic->has_macaddr &&
915 is_multicast_ether_addr(nd->macaddr.a)) {
916 error_setg(errp,
917 "NIC cannot have multicast MAC address (odd 1st byte)");
918 return -1;
919 }
920 qemu_macaddr_default_if_unset(&nd->macaddr);
921
922 if (nic->has_vectors) {
923 if (nic->vectors > 0x7ffffff) {
924 error_setg(errp, "invalid # of vectors: %"PRIu32, nic->vectors);
925 return -1;
926 }
927 nd->nvectors = nic->vectors;
928 } else {
929 nd->nvectors = DEV_NVECTORS_UNSPECIFIED;
930 }
931
932 nd->used = 1;
933 nb_nics++;
934
935 return idx;
936}
937
938
939static int (* const net_client_init_fun[NET_CLIENT_DRIVER__MAX])(
940 const Netdev *netdev,
941 const char *name,
942 NetClientState *peer, Error **errp) = {
943 [NET_CLIENT_DRIVER_NIC] = net_init_nic,
944#ifdef CONFIG_SLIRP
945 [NET_CLIENT_DRIVER_USER] = net_init_slirp,
946#endif
947 [NET_CLIENT_DRIVER_TAP] = net_init_tap,
948 [NET_CLIENT_DRIVER_SOCKET] = net_init_socket,
949#ifdef CONFIG_VDE
950 [NET_CLIENT_DRIVER_VDE] = net_init_vde,
951#endif
952#ifdef CONFIG_NETMAP
953 [NET_CLIENT_DRIVER_NETMAP] = net_init_netmap,
954#endif
955#ifdef CONFIG_NET_BRIDGE
956 [NET_CLIENT_DRIVER_BRIDGE] = net_init_bridge,
957#endif
958 [NET_CLIENT_DRIVER_HUBPORT] = net_init_hubport,
959#ifdef CONFIG_VHOST_NET_USER
960 [NET_CLIENT_DRIVER_VHOST_USER] = net_init_vhost_user,
961#endif
962#ifdef CONFIG_L2TPV3
963 [NET_CLIENT_DRIVER_L2TPV3] = net_init_l2tpv3,
964#endif
965};
966
967
968static int net_client_init1(const void *object, bool is_netdev, Error **errp)
969{
970 Netdev legacy = {0};
971 const Netdev *netdev;
972 const char *name;
973 NetClientState *peer = NULL;
974
975 if (is_netdev) {
976 netdev = object;
977 name = netdev->id;
978
979 if (netdev->type == NET_CLIENT_DRIVER_NIC ||
980 !net_client_init_fun[netdev->type]) {
981 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
982 "a netdev backend type");
983 return -1;
984 }
985 } else {
986 const NetLegacy *net = object;
987 const NetLegacyOptions *opts = net->opts;
988 legacy.id = net->id;
989 netdev = &legacy;
990 /* missing optional values have been initialized to "all bits zero" */
991 name = net->has_id ? net->id : net->name;
992
993 if (net->has_name) {
994 warn_report("The 'name' parameter is deprecated, use 'id' instead");
995 }
996
997 /* Map the old options to the new flat type */
998 switch (opts->type) {
999 case NET_LEGACY_OPTIONS_TYPE_NONE:
1000 return 0; /* nothing to do */
1001 case NET_LEGACY_OPTIONS_TYPE_NIC:
1002 legacy.type = NET_CLIENT_DRIVER_NIC;
1003 legacy.u.nic = opts->u.nic;
1004 break;
1005 case NET_LEGACY_OPTIONS_TYPE_USER:
1006 legacy.type = NET_CLIENT_DRIVER_USER;
1007 legacy.u.user = opts->u.user;
1008 break;
1009 case NET_LEGACY_OPTIONS_TYPE_TAP:
1010 legacy.type = NET_CLIENT_DRIVER_TAP;
1011 legacy.u.tap = opts->u.tap;
1012 break;
1013 case NET_LEGACY_OPTIONS_TYPE_L2TPV3:
1014 legacy.type = NET_CLIENT_DRIVER_L2TPV3;
1015 legacy.u.l2tpv3 = opts->u.l2tpv3;
1016 break;
1017 case NET_LEGACY_OPTIONS_TYPE_SOCKET:
1018 legacy.type = NET_CLIENT_DRIVER_SOCKET;
1019 legacy.u.socket = opts->u.socket;
1020 break;
1021 case NET_LEGACY_OPTIONS_TYPE_VDE:
1022 legacy.type = NET_CLIENT_DRIVER_VDE;
1023 legacy.u.vde = opts->u.vde;
1024 break;
1025 case NET_LEGACY_OPTIONS_TYPE_BRIDGE:
1026 legacy.type = NET_CLIENT_DRIVER_BRIDGE;
1027 legacy.u.bridge = opts->u.bridge;
1028 break;
1029 case NET_LEGACY_OPTIONS_TYPE_NETMAP:
1030 legacy.type = NET_CLIENT_DRIVER_NETMAP;
1031 legacy.u.netmap = opts->u.netmap;
1032 break;
1033 case NET_LEGACY_OPTIONS_TYPE_VHOST_USER:
1034 legacy.type = NET_CLIENT_DRIVER_VHOST_USER;
1035 legacy.u.vhost_user = opts->u.vhost_user;
1036 break;
1037 default:
1038 abort();
1039 }
1040
1041 if (!net_client_init_fun[netdev->type]) {
1042 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
1043 "a net backend type (maybe it is not compiled "
1044 "into this binary)");
1045 return -1;
1046 }
1047
1048 /* Do not add to a hub if it's a nic with a netdev= parameter. */
1049 if (netdev->type != NET_CLIENT_DRIVER_NIC ||
1050 !opts->u.nic.has_netdev) {
1051 peer = net_hub_add_port(0, NULL, NULL);
1052 }
1053 }
1054
1055 if (net_client_init_fun[netdev->type](netdev, name, peer, errp) < 0) {
1056 /* FIXME drop when all init functions store an Error */
1057 if (errp && !*errp) {
1058 error_setg(errp, QERR_DEVICE_INIT_FAILED,
1059 NetClientDriver_str(netdev->type));
1060 }
1061 return -1;
1062 }
1063 return 0;
1064}
1065
1066static void show_netdevs(void)
1067{
1068 int idx;
1069 const char *available_netdevs[] = {
1070 "socket",
1071 "hubport",
1072 "tap",
1073#ifdef CONFIG_SLIRP
1074 "user",
1075#endif
1076#ifdef CONFIG_L2TPV3
1077 "l2tpv3",
1078#endif
1079#ifdef CONFIG_VDE
1080 "vde",
1081#endif
1082#ifdef CONFIG_NET_BRIDGE
1083 "bridge",
1084#endif
1085#ifdef CONFIG_NETMAP
1086 "netmap",
1087#endif
1088#ifdef CONFIG_POSIX
1089 "vhost-user",
1090#endif
1091 };
1092
1093 printf("Available netdev backend types:\n");
1094 for (idx = 0; idx < ARRAY_SIZE(available_netdevs); idx++) {
1095 puts(available_netdevs[idx]);
1096 }
1097}
1098
1099static int net_client_init(QemuOpts *opts, bool is_netdev, Error **errp)
1100{
1101 gchar **substrings = NULL;
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 /* Parse convenience option format ip6-net=fec0::0[/64] */
1114 const char *ip6_net = qemu_opt_get(opts, "ipv6-net");
1115
1116 if (ip6_net) {
1117 char *prefix_addr;
1118 unsigned long prefix_len = 64; /* Default 64bit prefix length. */
1119
1120 substrings = g_strsplit(ip6_net, "/", 2);
1121 if (!substrings || !substrings[0]) {
1122 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "ipv6-net",
1123 "a valid IPv6 prefix");
1124 goto out;
1125 }
1126
1127 prefix_addr = substrings[0];
1128
1129 if (substrings[1]) {
1130 /* User-specified prefix length. */
1131 int err;
1132
1133 err = qemu_strtoul(substrings[1], NULL, 10, &prefix_len);
1134 if (err) {
1135 error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1136 "ipv6-prefixlen", "a number");
1137 goto out;
1138 }
1139 }
1140
1141 qemu_opt_set(opts, "ipv6-prefix", prefix_addr, &error_abort);
1142 qemu_opt_set_number(opts, "ipv6-prefixlen", prefix_len,
1143 &error_abort);
1144 qemu_opt_unset(opts, "ipv6-net");
1145 }
1146 }
1147
1148 if (is_netdev) {
1149 visit_type_Netdev(v, NULL, (Netdev **)&object, &err);
1150 } else {
1151 visit_type_NetLegacy(v, NULL, (NetLegacy **)&object, &err);
1152 }
1153
1154 if (!err) {
1155 ret = net_client_init1(object, is_netdev, &err);
1156 }
1157
1158 if (is_netdev) {
1159 qapi_free_Netdev(object);
1160 } else {
1161 qapi_free_NetLegacy(object);
1162 }
1163
1164out:
1165 error_propagate(errp, err);
1166 g_strfreev(substrings);
1167 visit_free(v);
1168 return ret;
1169}
1170
1171void netdev_add(QemuOpts *opts, Error **errp)
1172{
1173 net_client_init(opts, true, errp);
1174}
1175
1176void qmp_netdev_add(QDict *qdict, QObject **ret, Error **errp)
1177{
1178 Error *local_err = NULL;
1179 QemuOptsList *opts_list;
1180 QemuOpts *opts;
1181
1182 opts_list = qemu_find_opts_err("netdev", &local_err);
1183 if (local_err) {
1184 goto out;
1185 }
1186
1187 opts = qemu_opts_from_qdict(opts_list, qdict, &local_err);
1188 if (local_err) {
1189 goto out;
1190 }
1191
1192 netdev_add(opts, &local_err);
1193 if (local_err) {
1194 qemu_opts_del(opts);
1195 goto out;
1196 }
1197
1198out:
1199 error_propagate(errp, local_err);
1200}
1201
1202void qmp_netdev_del(const char *id, Error **errp)
1203{
1204 NetClientState *nc;
1205 QemuOpts *opts;
1206
1207 nc = qemu_find_netdev(id);
1208 if (!nc) {
1209 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1210 "Device '%s' not found", id);
1211 return;
1212 }
1213
1214 opts = qemu_opts_find(qemu_find_opts_err("netdev", NULL), id);
1215 if (!opts) {
1216 error_setg(errp, "Device '%s' is not a netdev", id);
1217 return;
1218 }
1219
1220 qemu_del_net_client(nc);
1221 qemu_opts_del(opts);
1222}
1223
1224static void netfilter_print_info(Monitor *mon, NetFilterState *nf)
1225{
1226 char *str;
1227 ObjectProperty *prop;
1228 ObjectPropertyIterator iter;
1229 Visitor *v;
1230
1231 /* generate info str */
1232 object_property_iter_init(&iter, OBJECT(nf));
1233 while ((prop = object_property_iter_next(&iter))) {
1234 if (!strcmp(prop->name, "type")) {
1235 continue;
1236 }
1237 v = string_output_visitor_new(false, &str);
1238 object_property_get(OBJECT(nf), v, prop->name, NULL);
1239 visit_complete(v, &str);
1240 visit_free(v);
1241 monitor_printf(mon, ",%s=%s", prop->name, str);
1242 g_free(str);
1243 }
1244 monitor_printf(mon, "\n");
1245}
1246
1247void print_net_client(Monitor *mon, NetClientState *nc)
1248{
1249 NetFilterState *nf;
1250
1251 monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name,
1252 nc->queue_index,
1253 NetClientDriver_str(nc->info->type),
1254 nc->info_str);
1255 if (!QTAILQ_EMPTY(&nc->filters)) {
1256 monitor_printf(mon, "filters:\n");
1257 }
1258 QTAILQ_FOREACH(nf, &nc->filters, next) {
1259 char *path = object_get_canonical_path_component(OBJECT(nf));
1260
1261 monitor_printf(mon, " - %s: type=%s", path,
1262 object_get_typename(OBJECT(nf)));
1263 netfilter_print_info(mon, nf);
1264 g_free(path);
1265 }
1266}
1267
1268RxFilterInfoList *qmp_query_rx_filter(bool has_name, const char *name,
1269 Error **errp)
1270{
1271 NetClientState *nc;
1272 RxFilterInfoList *filter_list = NULL, *last_entry = NULL;
1273
1274 QTAILQ_FOREACH(nc, &net_clients, next) {
1275 RxFilterInfoList *entry;
1276 RxFilterInfo *info;
1277
1278 if (has_name && strcmp(nc->name, name) != 0) {
1279 continue;
1280 }
1281
1282 /* only query rx-filter information of NIC */
1283 if (nc->info->type != NET_CLIENT_DRIVER_NIC) {
1284 if (has_name) {
1285 error_setg(errp, "net client(%s) isn't a NIC", name);
1286 return NULL;
1287 }
1288 continue;
1289 }
1290
1291 /* only query information on queue 0 since the info is per nic,
1292 * not per queue
1293 */
1294 if (nc->queue_index != 0)
1295 continue;
1296
1297 if (nc->info->query_rx_filter) {
1298 info = nc->info->query_rx_filter(nc);
1299 entry = g_malloc0(sizeof(*entry));
1300 entry->value = info;
1301
1302 if (!filter_list) {
1303 filter_list = entry;
1304 } else {
1305 last_entry->next = entry;
1306 }
1307 last_entry = entry;
1308 } else if (has_name) {
1309 error_setg(errp, "net client(%s) doesn't support"
1310 " rx-filter querying", name);
1311 return NULL;
1312 }
1313
1314 if (has_name) {
1315 break;
1316 }
1317 }
1318
1319 if (filter_list == NULL && has_name) {
1320 error_setg(errp, "invalid net client name: %s", name);
1321 }
1322
1323 return filter_list;
1324}
1325
1326void hmp_info_network(Monitor *mon, const QDict *qdict)
1327{
1328 NetClientState *nc, *peer;
1329 NetClientDriver type;
1330
1331 net_hub_info(mon);
1332
1333 QTAILQ_FOREACH(nc, &net_clients, next) {
1334 peer = nc->peer;
1335 type = nc->info->type;
1336
1337 /* Skip if already printed in hub info */
1338 if (net_hub_id_for_client(nc, NULL) == 0) {
1339 continue;
1340 }
1341
1342 if (!peer || type == NET_CLIENT_DRIVER_NIC) {
1343 print_net_client(mon, nc);
1344 } /* else it's a netdev connected to a NIC, printed with the NIC */
1345 if (peer && type == NET_CLIENT_DRIVER_NIC) {
1346 monitor_printf(mon, " \\ ");
1347 print_net_client(mon, peer);
1348 }
1349 }
1350}
1351
1352void colo_notify_filters_event(int event, Error **errp)
1353{
1354 NetClientState *nc;
1355 NetFilterState *nf;
1356 NetFilterClass *nfc = NULL;
1357 Error *local_err = NULL;
1358
1359 QTAILQ_FOREACH(nc, &net_clients, next) {
1360 QTAILQ_FOREACH(nf, &nc->filters, next) {
1361 nfc = NETFILTER_GET_CLASS(OBJECT(nf));
1362 nfc->handle_event(nf, event, &local_err);
1363 if (local_err) {
1364 error_propagate(errp, local_err);
1365 return;
1366 }
1367 }
1368 }
1369}
1370
1371void qmp_set_link(const char *name, bool up, Error **errp)
1372{
1373 NetClientState *ncs[MAX_QUEUE_NUM];
1374 NetClientState *nc;
1375 int queues, i;
1376
1377 queues = qemu_find_net_clients_except(name, ncs,
1378 NET_CLIENT_DRIVER__MAX,
1379 MAX_QUEUE_NUM);
1380
1381 if (queues == 0) {
1382 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1383 "Device '%s' not found", name);
1384 return;
1385 }
1386 nc = ncs[0];
1387
1388 for (i = 0; i < queues; i++) {
1389 ncs[i]->link_down = !up;
1390 }
1391
1392 if (nc->info->link_status_changed) {
1393 nc->info->link_status_changed(nc);
1394 }
1395
1396 if (nc->peer) {
1397 /* Change peer link only if the peer is NIC and then notify peer.
1398 * If the peer is a HUBPORT or a backend, we do not change the
1399 * link status.
1400 *
1401 * This behavior is compatible with qemu hubs where there could be
1402 * multiple clients that can still communicate with each other in
1403 * disconnected mode. For now maintain this compatibility.
1404 */
1405 if (nc->peer->info->type == NET_CLIENT_DRIVER_NIC) {
1406 for (i = 0; i < queues; i++) {
1407 ncs[i]->peer->link_down = !up;
1408 }
1409 }
1410 if (nc->peer->info->link_status_changed) {
1411 nc->peer->info->link_status_changed(nc->peer);
1412 }
1413 }
1414}
1415
1416static void net_vm_change_state_handler(void *opaque, int running,
1417 RunState state)
1418{
1419 NetClientState *nc;
1420 NetClientState *tmp;
1421
1422 QTAILQ_FOREACH_SAFE(nc, &net_clients, next, tmp) {
1423 if (running) {
1424 /* Flush queued packets and wake up backends. */
1425 if (nc->peer && qemu_can_send_packet(nc)) {
1426 qemu_flush_queued_packets(nc->peer);
1427 }
1428 } else {
1429 /* Complete all queued packets, to guarantee we don't modify
1430 * state later when VM is not running.
1431 */
1432 qemu_flush_or_purge_queued_packets(nc, true);
1433 }
1434 }
1435}
1436
1437void net_cleanup(void)
1438{
1439 NetClientState *nc;
1440
1441 /* We may del multiple entries during qemu_del_net_client(),
1442 * so QTAILQ_FOREACH_SAFE() is also not safe here.
1443 */
1444 while (!QTAILQ_EMPTY(&net_clients)) {
1445 nc = QTAILQ_FIRST(&net_clients);
1446 if (nc->info->type == NET_CLIENT_DRIVER_NIC) {
1447 qemu_del_nic(qemu_get_nic(nc));
1448 } else {
1449 qemu_del_net_client(nc);
1450 }
1451 }
1452
1453 qemu_del_vm_change_state_handler(net_change_state_entry);
1454}
1455
1456void net_check_clients(void)
1457{
1458 NetClientState *nc;
1459 int i;
1460
1461 net_hub_check_clients();
1462
1463 QTAILQ_FOREACH(nc, &net_clients, next) {
1464 if (!nc->peer) {
1465 warn_report("%s %s has no peer",
1466 nc->info->type == NET_CLIENT_DRIVER_NIC
1467 ? "nic" : "netdev",
1468 nc->name);
1469 }
1470 }
1471
1472 /* Check that all NICs requested via -net nic actually got created.
1473 * NICs created via -device don't need to be checked here because
1474 * they are always instantiated.
1475 */
1476 for (i = 0; i < MAX_NICS; i++) {
1477 NICInfo *nd = &nd_table[i];
1478 if (nd->used && !nd->instantiated) {
1479 warn_report("requested NIC (%s, model %s) "
1480 "was not created (not supported by this machine?)",
1481 nd->name ? nd->name : "anonymous",
1482 nd->model ? nd->model : "unspecified");
1483 }
1484 }
1485}
1486
1487static int net_init_client(void *dummy, QemuOpts *opts, Error **errp)
1488{
1489 return net_client_init(opts, false, errp);
1490}
1491
1492static int net_init_netdev(void *dummy, QemuOpts *opts, Error **errp)
1493{
1494 return net_client_init(opts, true, errp);
1495}
1496
1497/* For the convenience "--nic" parameter */
1498static int net_param_nic(void *dummy, QemuOpts *opts, Error **errp)
1499{
1500 char *mac, *nd_id;
1501 int idx, ret;
1502 NICInfo *ni;
1503 const char *type;
1504
1505 type = qemu_opt_get(opts, "type");
1506 if (type && g_str_equal(type, "none")) {
1507 return 0; /* Nothing to do, default_net is cleared in vl.c */
1508 }
1509
1510 idx = nic_get_free_idx();
1511 if (idx == -1 || nb_nics >= MAX_NICS) {
1512 error_setg(errp, "no more on-board/default NIC slots available");
1513 return -1;
1514 }
1515
1516 if (!type) {
1517 qemu_opt_set(opts, "type", "user", &error_abort);
1518 }
1519
1520 ni = &nd_table[idx];
1521 memset(ni, 0, sizeof(*ni));
1522 ni->model = qemu_opt_get_del(opts, "model");
1523
1524 /* Create an ID if the user did not specify one */
1525 nd_id = g_strdup(qemu_opts_id(opts));
1526 if (!nd_id) {
1527 nd_id = g_strdup_printf("__org.qemu.nic%i\n", idx);
1528 qemu_opts_set_id(opts, nd_id);
1529 }
1530
1531 /* Handle MAC address */
1532 mac = qemu_opt_get_del(opts, "mac");
1533 if (mac) {
1534 ret = net_parse_macaddr(ni->macaddr.a, mac);
1535 g_free(mac);
1536 if (ret) {
1537 error_setg(errp, "invalid syntax for ethernet address");
1538 goto out;
1539 }
1540 if (is_multicast_ether_addr(ni->macaddr.a)) {
1541 error_setg(errp, "NIC cannot have multicast MAC address");
1542 ret = -1;
1543 goto out;
1544 }
1545 }
1546 qemu_macaddr_default_if_unset(&ni->macaddr);
1547
1548 ret = net_client_init(opts, true, errp);
1549 if (ret == 0) {
1550 ni->netdev = qemu_find_netdev(nd_id);
1551 ni->used = true;
1552 nb_nics++;
1553 }
1554
1555out:
1556 g_free(nd_id);
1557 return ret;
1558}
1559
1560int net_init_clients(Error **errp)
1561{
1562 net_change_state_entry =
1563 qemu_add_vm_change_state_handler(net_vm_change_state_handler, NULL);
1564
1565 QTAILQ_INIT(&net_clients);
1566
1567 if (qemu_opts_foreach(qemu_find_opts("netdev"),
1568 net_init_netdev, NULL, errp)) {
1569 return -1;
1570 }
1571
1572 if (qemu_opts_foreach(qemu_find_opts("nic"), net_param_nic, NULL, errp)) {
1573 return -1;
1574 }
1575
1576 if (qemu_opts_foreach(qemu_find_opts("net"), net_init_client, NULL, errp)) {
1577 return -1;
1578 }
1579
1580 return 0;
1581}
1582
1583int net_client_parse(QemuOptsList *opts_list, const char *optarg)
1584{
1585 if (!qemu_opts_parse_noisily(opts_list, optarg, true)) {
1586 return -1;
1587 }
1588
1589 return 0;
1590}
1591
1592/* From FreeBSD */
1593/* XXX: optimize */
1594uint32_t net_crc32(const uint8_t *p, int len)
1595{
1596 uint32_t crc;
1597 int carry, i, j;
1598 uint8_t b;
1599
1600 crc = 0xffffffff;
1601 for (i = 0; i < len; i++) {
1602 b = *p++;
1603 for (j = 0; j < 8; j++) {
1604 carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01);
1605 crc <<= 1;
1606 b >>= 1;
1607 if (carry) {
1608 crc = ((crc ^ POLYNOMIAL_BE) | carry);
1609 }
1610 }
1611 }
1612
1613 return crc;
1614}
1615
1616uint32_t net_crc32_le(const uint8_t *p, int len)
1617{
1618 uint32_t crc;
1619 int carry, i, j;
1620 uint8_t b;
1621
1622 crc = 0xffffffff;
1623 for (i = 0; i < len; i++) {
1624 b = *p++;
1625 for (j = 0; j < 8; j++) {
1626 carry = (crc & 0x1) ^ (b & 0x01);
1627 crc >>= 1;
1628 b >>= 1;
1629 if (carry) {
1630 crc ^= POLYNOMIAL_LE;
1631 }
1632 }
1633 }
1634
1635 return crc;
1636}
1637
1638QemuOptsList qemu_netdev_opts = {
1639 .name = "netdev",
1640 .implied_opt_name = "type",
1641 .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head),
1642 .desc = {
1643 /*
1644 * no elements => accept any params
1645 * validation will happen later
1646 */
1647 { /* end of list */ }
1648 },
1649};
1650
1651QemuOptsList qemu_nic_opts = {
1652 .name = "nic",
1653 .implied_opt_name = "type",
1654 .head = QTAILQ_HEAD_INITIALIZER(qemu_nic_opts.head),
1655 .desc = {
1656 /*
1657 * no elements => accept any params
1658 * validation will happen later
1659 */
1660 { /* end of list */ }
1661 },
1662};
1663
1664QemuOptsList qemu_net_opts = {
1665 .name = "net",
1666 .implied_opt_name = "type",
1667 .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head),
1668 .desc = {
1669 /*
1670 * no elements => accept any params
1671 * validation will happen later
1672 */
1673 { /* end of list */ }
1674 },
1675};
1676
1677void net_socket_rs_init(SocketReadState *rs,
1678 SocketReadStateFinalize *finalize,
1679 bool vnet_hdr)
1680{
1681 rs->state = 0;
1682 rs->vnet_hdr = vnet_hdr;
1683 rs->index = 0;
1684 rs->packet_len = 0;
1685 rs->vnet_hdr_len = 0;
1686 memset(rs->buf, 0, sizeof(rs->buf));
1687 rs->finalize = finalize;
1688}
1689
1690/*
1691 * Returns
1692 * 0: success
1693 * -1: error occurs
1694 */
1695int net_fill_rstate(SocketReadState *rs, const uint8_t *buf, int size)
1696{
1697 unsigned int l;
1698
1699 while (size > 0) {
1700 /* Reassemble a packet from the network.
1701 * 0 = getting length.
1702 * 1 = getting vnet header length.
1703 * 2 = getting data.
1704 */
1705 switch (rs->state) {
1706 case 0:
1707 l = 4 - rs->index;
1708 if (l > size) {
1709 l = size;
1710 }
1711 memcpy(rs->buf + rs->index, buf, l);
1712 buf += l;
1713 size -= l;
1714 rs->index += l;
1715 if (rs->index == 4) {
1716 /* got length */
1717 rs->packet_len = ntohl(*(uint32_t *)rs->buf);
1718 rs->index = 0;
1719 if (rs->vnet_hdr) {
1720 rs->state = 1;
1721 } else {
1722 rs->state = 2;
1723 rs->vnet_hdr_len = 0;
1724 }
1725 }
1726 break;
1727 case 1:
1728 l = 4 - rs->index;
1729 if (l > size) {
1730 l = size;
1731 }
1732 memcpy(rs->buf + rs->index, buf, l);
1733 buf += l;
1734 size -= l;
1735 rs->index += l;
1736 if (rs->index == 4) {
1737 /* got vnet header length */
1738 rs->vnet_hdr_len = ntohl(*(uint32_t *)rs->buf);
1739 rs->index = 0;
1740 rs->state = 2;
1741 }
1742 break;
1743 case 2:
1744 l = rs->packet_len - rs->index;
1745 if (l > size) {
1746 l = size;
1747 }
1748 if (rs->index + l <= sizeof(rs->buf)) {
1749 memcpy(rs->buf + rs->index, buf, l);
1750 } else {
1751 fprintf(stderr, "serious error: oversized packet received,"
1752 "connection terminated.\n");
1753 rs->index = rs->state = 0;
1754 return -1;
1755 }
1756
1757 rs->index += l;
1758 buf += l;
1759 size -= l;
1760 if (rs->index >= rs->packet_len) {
1761 rs->index = 0;
1762 rs->state = 0;
1763 assert(rs->finalize);
1764 rs->finalize(rs);
1765 }
1766 break;
1767 }
1768 }
1769
1770 assert(size == 0);
1771 return 0;
1772}
1773