jcs.org
qemu with hax to log dma reads & writes
jcs.org/2018/11/12/vfio
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
328NetClientState *qemu_get_peer(NetClientState *nc, int queue_index)
329{
330 assert(nc != NULL);
331 NetClientState *ncs = nc + queue_index;
332 return ncs->peer;
333}
334
335static void qemu_cleanup_net_client(NetClientState *nc)
336{
337 QTAILQ_REMOVE(&net_clients, nc, next);
338
339 if (nc->info->cleanup) {
340 nc->info->cleanup(nc);
341 }
342}
343
344static void qemu_free_net_client(NetClientState *nc)
345{
346 if (nc->incoming_queue) {
347 qemu_del_net_queue(nc->incoming_queue);
348 }
349 if (nc->peer) {
350 nc->peer->peer = NULL;
351 }
352 g_free(nc->name);
353 g_free(nc->model);
354 if (nc->destructor) {
355 nc->destructor(nc);
356 }
357}
358
359void qemu_del_net_client(NetClientState *nc)
360{
361 NetClientState *ncs[MAX_QUEUE_NUM];
362 int queues, i;
363 NetFilterState *nf, *next;
364
365 assert(nc->info->type != NET_CLIENT_DRIVER_NIC);
366
367 /* If the NetClientState belongs to a multiqueue backend, we will change all
368 * other NetClientStates also.
369 */
370 queues = qemu_find_net_clients_except(nc->name, ncs,
371 NET_CLIENT_DRIVER_NIC,
372 MAX_QUEUE_NUM);
373 assert(queues != 0);
374
375 QTAILQ_FOREACH_SAFE(nf, &nc->filters, next, next) {
376 object_unparent(OBJECT(nf));
377 }
378
379 /* If there is a peer NIC, delete and cleanup client, but do not free. */
380 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_NIC) {
381 NICState *nic = qemu_get_nic(nc->peer);
382 if (nic->peer_deleted) {
383 return;
384 }
385 nic->peer_deleted = true;
386
387 for (i = 0; i < queues; i++) {
388 ncs[i]->peer->link_down = true;
389 }
390
391 if (nc->peer->info->link_status_changed) {
392 nc->peer->info->link_status_changed(nc->peer);
393 }
394
395 for (i = 0; i < queues; i++) {
396 qemu_cleanup_net_client(ncs[i]);
397 }
398
399 return;
400 }
401
402 for (i = 0; i < queues; i++) {
403 qemu_cleanup_net_client(ncs[i]);
404 qemu_free_net_client(ncs[i]);
405 }
406}
407
408void qemu_del_nic(NICState *nic)
409{
410 int i, queues = MAX(nic->conf->peers.queues, 1);
411
412 qemu_macaddr_set_free(&nic->conf->macaddr);
413
414 /* If this is a peer NIC and peer has already been deleted, free it now. */
415 if (nic->peer_deleted) {
416 for (i = 0; i < queues; i++) {
417 qemu_free_net_client(qemu_get_subqueue(nic, i)->peer);
418 }
419 }
420
421 for (i = queues - 1; i >= 0; i--) {
422 NetClientState *nc = qemu_get_subqueue(nic, i);
423
424 qemu_cleanup_net_client(nc);
425 qemu_free_net_client(nc);
426 }
427
428 g_free(nic);
429}
430
431void qemu_foreach_nic(qemu_nic_foreach func, void *opaque)
432{
433 NetClientState *nc;
434
435 QTAILQ_FOREACH(nc, &net_clients, next) {
436 if (nc->info->type == NET_CLIENT_DRIVER_NIC) {
437 if (nc->queue_index == 0) {
438 func(qemu_get_nic(nc), opaque);
439 }
440 }
441 }
442}
443
444bool qemu_has_ufo(NetClientState *nc)
445{
446 if (!nc || !nc->info->has_ufo) {
447 return false;
448 }
449
450 return nc->info->has_ufo(nc);
451}
452
453bool qemu_has_vnet_hdr(NetClientState *nc)
454{
455 if (!nc || !nc->info->has_vnet_hdr) {
456 return false;
457 }
458
459 return nc->info->has_vnet_hdr(nc);
460}
461
462bool qemu_has_vnet_hdr_len(NetClientState *nc, int len)
463{
464 if (!nc || !nc->info->has_vnet_hdr_len) {
465 return false;
466 }
467
468 return nc->info->has_vnet_hdr_len(nc, len);
469}
470
471void qemu_using_vnet_hdr(NetClientState *nc, bool enable)
472{
473 if (!nc || !nc->info->using_vnet_hdr) {
474 return;
475 }
476
477 nc->info->using_vnet_hdr(nc, enable);
478}
479
480void qemu_set_offload(NetClientState *nc, int csum, int tso4, int tso6,
481 int ecn, int ufo)
482{
483 if (!nc || !nc->info->set_offload) {
484 return;
485 }
486
487 nc->info->set_offload(nc, csum, tso4, tso6, ecn, ufo);
488}
489
490void qemu_set_vnet_hdr_len(NetClientState *nc, int len)
491{
492 if (!nc || !nc->info->set_vnet_hdr_len) {
493 return;
494 }
495
496 nc->vnet_hdr_len = len;
497 nc->info->set_vnet_hdr_len(nc, len);
498}
499
500int qemu_set_vnet_le(NetClientState *nc, bool is_le)
501{
502#ifdef HOST_WORDS_BIGENDIAN
503 if (!nc || !nc->info->set_vnet_le) {
504 return -ENOSYS;
505 }
506
507 return nc->info->set_vnet_le(nc, is_le);
508#else
509 return 0;
510#endif
511}
512
513int qemu_set_vnet_be(NetClientState *nc, bool is_be)
514{
515#ifdef HOST_WORDS_BIGENDIAN
516 return 0;
517#else
518 if (!nc || !nc->info->set_vnet_be) {
519 return -ENOSYS;
520 }
521
522 return nc->info->set_vnet_be(nc, is_be);
523#endif
524}
525
526int qemu_can_send_packet(NetClientState *sender)
527{
528 int vm_running = runstate_is_running();
529
530 if (!vm_running) {
531 return 0;
532 }
533
534 if (!sender->peer) {
535 return 1;
536 }
537
538 if (sender->peer->receive_disabled) {
539 return 0;
540 } else if (sender->peer->info->can_receive &&
541 !sender->peer->info->can_receive(sender->peer)) {
542 return 0;
543 }
544 return 1;
545}
546
547static ssize_t filter_receive_iov(NetClientState *nc,
548 NetFilterDirection direction,
549 NetClientState *sender,
550 unsigned flags,
551 const struct iovec *iov,
552 int iovcnt,
553 NetPacketSent *sent_cb)
554{
555 ssize_t ret = 0;
556 NetFilterState *nf = NULL;
557
558 if (direction == NET_FILTER_DIRECTION_TX) {
559 QTAILQ_FOREACH(nf, &nc->filters, next) {
560 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov,
561 iovcnt, sent_cb);
562 if (ret) {
563 return ret;
564 }
565 }
566 } else {
567 QTAILQ_FOREACH_REVERSE(nf, &nc->filters, next) {
568 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov,
569 iovcnt, sent_cb);
570 if (ret) {
571 return ret;
572 }
573 }
574 }
575
576 return ret;
577}
578
579static ssize_t filter_receive(NetClientState *nc,
580 NetFilterDirection direction,
581 NetClientState *sender,
582 unsigned flags,
583 const uint8_t *data,
584 size_t size,
585 NetPacketSent *sent_cb)
586{
587 struct iovec iov = {
588 .iov_base = (void *)data,
589 .iov_len = size
590 };
591
592 return filter_receive_iov(nc, direction, sender, flags, &iov, 1, sent_cb);
593}
594
595void qemu_purge_queued_packets(NetClientState *nc)
596{
597 if (!nc->peer) {
598 return;
599 }
600
601 qemu_net_queue_purge(nc->peer->incoming_queue, nc);
602}
603
604void qemu_flush_or_purge_queued_packets(NetClientState *nc, bool purge)
605{
606 nc->receive_disabled = 0;
607
608 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_HUBPORT) {
609 if (net_hub_flush(nc->peer)) {
610 qemu_notify_event();
611 }
612 }
613 if (qemu_net_queue_flush(nc->incoming_queue)) {
614 /* We emptied the queue successfully, signal to the IO thread to repoll
615 * the file descriptor (for tap, for example).
616 */
617 qemu_notify_event();
618 } else if (purge) {
619 /* Unable to empty the queue, purge remaining packets */
620 qemu_net_queue_purge(nc->incoming_queue, nc->peer);
621 }
622}
623
624void qemu_flush_queued_packets(NetClientState *nc)
625{
626 qemu_flush_or_purge_queued_packets(nc, false);
627}
628
629static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender,
630 unsigned flags,
631 const uint8_t *buf, int size,
632 NetPacketSent *sent_cb)
633{
634 NetQueue *queue;
635 int ret;
636
637#ifdef DEBUG_NET
638 printf("qemu_send_packet_async:\n");
639 qemu_hexdump((const char *)buf, stdout, "net", size);
640#endif
641
642 if (sender->link_down || !sender->peer) {
643 return size;
644 }
645
646 /* Let filters handle the packet first */
647 ret = filter_receive(sender, NET_FILTER_DIRECTION_TX,
648 sender, flags, buf, size, sent_cb);
649 if (ret) {
650 return ret;
651 }
652
653 ret = filter_receive(sender->peer, NET_FILTER_DIRECTION_RX,
654 sender, flags, buf, size, sent_cb);
655 if (ret) {
656 return ret;
657 }
658
659 queue = sender->peer->incoming_queue;
660
661 return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb);
662}
663
664ssize_t qemu_send_packet_async(NetClientState *sender,
665 const uint8_t *buf, int size,
666 NetPacketSent *sent_cb)
667{
668 return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE,
669 buf, size, sent_cb);
670}
671
672ssize_t qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size)
673{
674 return qemu_send_packet_async(nc, buf, size, NULL);
675}
676
677ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size)
678{
679 return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW,
680 buf, size, NULL);
681}
682
683static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov,
684 int iovcnt, unsigned flags)
685{
686 uint8_t *buf = NULL;
687 uint8_t *buffer;
688 size_t offset;
689 ssize_t ret;
690
691 if (iovcnt == 1) {
692 buffer = iov[0].iov_base;
693 offset = iov[0].iov_len;
694 } else {
695 offset = iov_size(iov, iovcnt);
696 if (offset > NET_BUFSIZE) {
697 return -1;
698 }
699 buf = g_malloc(offset);
700 buffer = buf;
701 offset = iov_to_buf(iov, iovcnt, 0, buf, offset);
702 }
703
704 if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) {
705 ret = nc->info->receive_raw(nc, buffer, offset);
706 } else {
707 ret = nc->info->receive(nc, buffer, offset);
708 }
709
710 g_free(buf);
711 return ret;
712}
713
714static ssize_t qemu_deliver_packet_iov(NetClientState *sender,
715 unsigned flags,
716 const struct iovec *iov,
717 int iovcnt,
718 void *opaque)
719{
720 NetClientState *nc = opaque;
721 int ret;
722
723
724 if (nc->link_down) {
725 return iov_size(iov, iovcnt);
726 }
727
728 if (nc->receive_disabled) {
729 return 0;
730 }
731
732 if (nc->info->receive_iov && !(flags & QEMU_NET_PACKET_FLAG_RAW)) {
733 ret = nc->info->receive_iov(nc, iov, iovcnt);
734 } else {
735 ret = nc_sendv_compat(nc, iov, iovcnt, flags);
736 }
737
738 if (ret == 0) {
739 nc->receive_disabled = 1;
740 }
741
742 return ret;
743}
744
745ssize_t qemu_sendv_packet_async(NetClientState *sender,
746 const struct iovec *iov, int iovcnt,
747 NetPacketSent *sent_cb)
748{
749 NetQueue *queue;
750 size_t size = iov_size(iov, iovcnt);
751 int ret;
752
753 if (size > NET_BUFSIZE) {
754 return size;
755 }
756
757 if (sender->link_down || !sender->peer) {
758 return size;
759 }
760
761 /* Let filters handle the packet first */
762 ret = filter_receive_iov(sender, NET_FILTER_DIRECTION_TX, sender,
763 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb);
764 if (ret) {
765 return ret;
766 }
767
768 ret = filter_receive_iov(sender->peer, NET_FILTER_DIRECTION_RX, sender,
769 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb);
770 if (ret) {
771 return ret;
772 }
773
774 queue = sender->peer->incoming_queue;
775
776 return qemu_net_queue_send_iov(queue, sender,
777 QEMU_NET_PACKET_FLAG_NONE,
778 iov, iovcnt, sent_cb);
779}
780
781ssize_t
782qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt)
783{
784 return qemu_sendv_packet_async(nc, iov, iovcnt, NULL);
785}
786
787NetClientState *qemu_find_netdev(const char *id)
788{
789 NetClientState *nc;
790
791 QTAILQ_FOREACH(nc, &net_clients, next) {
792 if (nc->info->type == NET_CLIENT_DRIVER_NIC)
793 continue;
794 if (!strcmp(nc->name, id)) {
795 return nc;
796 }
797 }
798
799 return NULL;
800}
801
802int qemu_find_net_clients_except(const char *id, NetClientState **ncs,
803 NetClientDriver type, int max)
804{
805 NetClientState *nc;
806 int ret = 0;
807
808 QTAILQ_FOREACH(nc, &net_clients, next) {
809 if (nc->info->type == type) {
810 continue;
811 }
812 if (!id || !strcmp(nc->name, id)) {
813 if (ret < max) {
814 ncs[ret] = nc;
815 }
816 ret++;
817 }
818 }
819
820 return ret;
821}
822
823static int nic_get_free_idx(void)
824{
825 int index;
826
827 for (index = 0; index < MAX_NICS; index++)
828 if (!nd_table[index].used)
829 return index;
830 return -1;
831}
832
833int qemu_show_nic_models(const char *arg, const char *const *models)
834{
835 int i;
836
837 if (!arg || !is_help_option(arg)) {
838 return 0;
839 }
840
841 printf("Supported NIC models:\n");
842 for (i = 0 ; models[i]; i++) {
843 printf("%s\n", models[i]);
844 }
845 return 1;
846}
847
848void qemu_check_nic_model(NICInfo *nd, const char *model)
849{
850 const char *models[2];
851
852 models[0] = model;
853 models[1] = NULL;
854
855 if (qemu_show_nic_models(nd->model, models))
856 exit(0);
857 if (qemu_find_nic_model(nd, models, model) < 0)
858 exit(1);
859}
860
861int qemu_find_nic_model(NICInfo *nd, const char * const *models,
862 const char *default_model)
863{
864 int i;
865
866 if (!nd->model)
867 nd->model = g_strdup(default_model);
868
869 for (i = 0 ; models[i]; i++) {
870 if (strcmp(nd->model, models[i]) == 0)
871 return i;
872 }
873
874 error_report("Unsupported NIC model: %s", nd->model);
875 return -1;
876}
877
878static int net_init_nic(const Netdev *netdev, const char *name,
879 NetClientState *peer, Error **errp)
880{
881 int idx;
882 NICInfo *nd;
883 const NetLegacyNicOptions *nic;
884
885 assert(netdev->type == NET_CLIENT_DRIVER_NIC);
886 nic = &netdev->u.nic;
887
888 idx = nic_get_free_idx();
889 if (idx == -1 || nb_nics >= MAX_NICS) {
890 error_setg(errp, "too many NICs");
891 return -1;
892 }
893
894 nd = &nd_table[idx];
895
896 memset(nd, 0, sizeof(*nd));
897
898 if (nic->has_netdev) {
899 nd->netdev = qemu_find_netdev(nic->netdev);
900 if (!nd->netdev) {
901 error_setg(errp, "netdev '%s' not found", nic->netdev);
902 return -1;
903 }
904 } else {
905 assert(peer);
906 nd->netdev = peer;
907 }
908 nd->name = g_strdup(name);
909 if (nic->has_model) {
910 nd->model = g_strdup(nic->model);
911 }
912 if (nic->has_addr) {
913 nd->devaddr = g_strdup(nic->addr);
914 }
915
916 if (nic->has_macaddr &&
917 net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) {
918 error_setg(errp, "invalid syntax for ethernet address");
919 return -1;
920 }
921 if (nic->has_macaddr &&
922 is_multicast_ether_addr(nd->macaddr.a)) {
923 error_setg(errp,
924 "NIC cannot have multicast MAC address (odd 1st byte)");
925 return -1;
926 }
927 qemu_macaddr_default_if_unset(&nd->macaddr);
928
929 if (nic->has_vectors) {
930 if (nic->vectors > 0x7ffffff) {
931 error_setg(errp, "invalid # of vectors: %"PRIu32, nic->vectors);
932 return -1;
933 }
934 nd->nvectors = nic->vectors;
935 } else {
936 nd->nvectors = DEV_NVECTORS_UNSPECIFIED;
937 }
938
939 nd->used = 1;
940 nb_nics++;
941
942 return idx;
943}
944
945
946static int (* const net_client_init_fun[NET_CLIENT_DRIVER__MAX])(
947 const Netdev *netdev,
948 const char *name,
949 NetClientState *peer, Error **errp) = {
950 [NET_CLIENT_DRIVER_NIC] = net_init_nic,
951#ifdef CONFIG_SLIRP
952 [NET_CLIENT_DRIVER_USER] = net_init_slirp,
953#endif
954 [NET_CLIENT_DRIVER_TAP] = net_init_tap,
955 [NET_CLIENT_DRIVER_SOCKET] = net_init_socket,
956#ifdef CONFIG_VDE
957 [NET_CLIENT_DRIVER_VDE] = net_init_vde,
958#endif
959#ifdef CONFIG_NETMAP
960 [NET_CLIENT_DRIVER_NETMAP] = net_init_netmap,
961#endif
962#ifdef CONFIG_NET_BRIDGE
963 [NET_CLIENT_DRIVER_BRIDGE] = net_init_bridge,
964#endif
965 [NET_CLIENT_DRIVER_HUBPORT] = net_init_hubport,
966#ifdef CONFIG_VHOST_NET_USER
967 [NET_CLIENT_DRIVER_VHOST_USER] = net_init_vhost_user,
968#endif
969#ifdef CONFIG_VHOST_NET_VDPA
970 [NET_CLIENT_DRIVER_VHOST_VDPA] = net_init_vhost_vdpa,
971#endif
972#ifdef CONFIG_L2TPV3
973 [NET_CLIENT_DRIVER_L2TPV3] = net_init_l2tpv3,
974#endif
975};
976
977
978static int net_client_init1(const Netdev *netdev, bool is_netdev, Error **errp)
979{
980 NetClientState *peer = NULL;
981
982 if (is_netdev) {
983 if (netdev->type == NET_CLIENT_DRIVER_NIC ||
984 !net_client_init_fun[netdev->type]) {
985 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
986 "a netdev backend type");
987 return -1;
988 }
989 } else {
990 if (netdev->type == NET_CLIENT_DRIVER_NONE) {
991 return 0; /* nothing to do */
992 }
993 if (netdev->type == NET_CLIENT_DRIVER_HUBPORT ||
994 !net_client_init_fun[netdev->type]) {
995 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
996 "a net backend type (maybe it is not compiled "
997 "into this binary)");
998 return -1;
999 }
1000
1001 /* Do not add to a hub if it's a nic with a netdev= parameter. */
1002 if (netdev->type != NET_CLIENT_DRIVER_NIC ||
1003 !netdev->u.nic.has_netdev) {
1004 peer = net_hub_add_port(0, NULL, NULL);
1005 }
1006 }
1007
1008 if (net_client_init_fun[netdev->type](netdev, netdev->id, peer, errp) < 0) {
1009 /* FIXME drop when all init functions store an Error */
1010 if (errp && !*errp) {
1011 error_setg(errp, QERR_DEVICE_INIT_FAILED,
1012 NetClientDriver_str(netdev->type));
1013 }
1014 return -1;
1015 }
1016
1017 if (is_netdev) {
1018 NetClientState *nc;
1019
1020 nc = qemu_find_netdev(netdev->id);
1021 assert(nc);
1022 nc->is_netdev = true;
1023 }
1024
1025 return 0;
1026}
1027
1028static void show_netdevs(void)
1029{
1030 int idx;
1031 const char *available_netdevs[] = {
1032 "socket",
1033 "hubport",
1034 "tap",
1035#ifdef CONFIG_SLIRP
1036 "user",
1037#endif
1038#ifdef CONFIG_L2TPV3
1039 "l2tpv3",
1040#endif
1041#ifdef CONFIG_VDE
1042 "vde",
1043#endif
1044#ifdef CONFIG_NET_BRIDGE
1045 "bridge",
1046#endif
1047#ifdef CONFIG_NETMAP
1048 "netmap",
1049#endif
1050#ifdef CONFIG_POSIX
1051 "vhost-user",
1052#endif
1053 };
1054
1055 printf("Available netdev backend types:\n");
1056 for (idx = 0; idx < ARRAY_SIZE(available_netdevs); idx++) {
1057 puts(available_netdevs[idx]);
1058 }
1059}
1060
1061static int net_client_init(QemuOpts *opts, bool is_netdev, Error **errp)
1062{
1063 gchar **substrings = NULL;
1064 Netdev *object = NULL;
1065 int ret = -1;
1066 Visitor *v = opts_visitor_new(opts);
1067
1068 const char *type = qemu_opt_get(opts, "type");
1069
1070 if (is_netdev && type && is_help_option(type)) {
1071 show_netdevs();
1072 exit(0);
1073 } else {
1074 /* Parse convenience option format ip6-net=fec0::0[/64] */
1075 const char *ip6_net = qemu_opt_get(opts, "ipv6-net");
1076
1077 if (ip6_net) {
1078 char *prefix_addr;
1079 unsigned long prefix_len = 64; /* Default 64bit prefix length. */
1080
1081 substrings = g_strsplit(ip6_net, "/", 2);
1082 if (!substrings || !substrings[0]) {
1083 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "ipv6-net",
1084 "a valid IPv6 prefix");
1085 goto out;
1086 }
1087
1088 prefix_addr = substrings[0];
1089
1090 /* Handle user-specified prefix length. */
1091 if (substrings[1] &&
1092 qemu_strtoul(substrings[1], NULL, 10, &prefix_len))
1093 {
1094 error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1095 "ipv6-prefixlen", "a number");
1096 goto out;
1097 }
1098
1099 qemu_opt_set(opts, "ipv6-prefix", prefix_addr, &error_abort);
1100 qemu_opt_set_number(opts, "ipv6-prefixlen", prefix_len,
1101 &error_abort);
1102 qemu_opt_unset(opts, "ipv6-net");
1103 }
1104 }
1105
1106 /* Create an ID for -net if the user did not specify one */
1107 if (!is_netdev && !qemu_opts_id(opts)) {
1108 static int idx;
1109 qemu_opts_set_id(opts, g_strdup_printf("__org.qemu.net%i", idx++));
1110 }
1111
1112 if (visit_type_Netdev(v, NULL, &object, errp)) {
1113 ret = net_client_init1(object, is_netdev, errp);
1114 }
1115
1116 qapi_free_Netdev(object);
1117
1118out:
1119 g_strfreev(substrings);
1120 visit_free(v);
1121 return ret;
1122}
1123
1124void netdev_add(QemuOpts *opts, Error **errp)
1125{
1126 net_client_init(opts, true, errp);
1127}
1128
1129void qmp_netdev_add(Netdev *netdev, Error **errp)
1130{
1131 net_client_init1(netdev, true, errp);
1132}
1133
1134void qmp_netdev_del(const char *id, Error **errp)
1135{
1136 NetClientState *nc;
1137
1138 nc = qemu_find_netdev(id);
1139 if (!nc) {
1140 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1141 "Device '%s' not found", id);
1142 return;
1143 }
1144
1145 if (!nc->is_netdev) {
1146 error_setg(errp, "Device '%s' is not a netdev", id);
1147 return;
1148 }
1149
1150 qemu_del_net_client(nc);
1151}
1152
1153static void netfilter_print_info(Monitor *mon, NetFilterState *nf)
1154{
1155 char *str;
1156 ObjectProperty *prop;
1157 ObjectPropertyIterator iter;
1158 Visitor *v;
1159
1160 /* generate info str */
1161 object_property_iter_init(&iter, OBJECT(nf));
1162 while ((prop = object_property_iter_next(&iter))) {
1163 if (!strcmp(prop->name, "type")) {
1164 continue;
1165 }
1166 v = string_output_visitor_new(false, &str);
1167 object_property_get(OBJECT(nf), prop->name, v, NULL);
1168 visit_complete(v, &str);
1169 visit_free(v);
1170 monitor_printf(mon, ",%s=%s", prop->name, str);
1171 g_free(str);
1172 }
1173 monitor_printf(mon, "\n");
1174}
1175
1176void print_net_client(Monitor *mon, NetClientState *nc)
1177{
1178 NetFilterState *nf;
1179
1180 monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name,
1181 nc->queue_index,
1182 NetClientDriver_str(nc->info->type),
1183 nc->info_str);
1184 if (!QTAILQ_EMPTY(&nc->filters)) {
1185 monitor_printf(mon, "filters:\n");
1186 }
1187 QTAILQ_FOREACH(nf, &nc->filters, next) {
1188 char *path = object_get_canonical_path_component(OBJECT(nf));
1189
1190 monitor_printf(mon, " - %s: type=%s", path,
1191 object_get_typename(OBJECT(nf)));
1192 netfilter_print_info(mon, nf);
1193 g_free(path);
1194 }
1195}
1196
1197RxFilterInfoList *qmp_query_rx_filter(bool has_name, const char *name,
1198 Error **errp)
1199{
1200 NetClientState *nc;
1201 RxFilterInfoList *filter_list = NULL, *last_entry = NULL;
1202
1203 QTAILQ_FOREACH(nc, &net_clients, next) {
1204 RxFilterInfoList *entry;
1205 RxFilterInfo *info;
1206
1207 if (has_name && strcmp(nc->name, name) != 0) {
1208 continue;
1209 }
1210
1211 /* only query rx-filter information of NIC */
1212 if (nc->info->type != NET_CLIENT_DRIVER_NIC) {
1213 if (has_name) {
1214 error_setg(errp, "net client(%s) isn't a NIC", name);
1215 return NULL;
1216 }
1217 continue;
1218 }
1219
1220 /* only query information on queue 0 since the info is per nic,
1221 * not per queue
1222 */
1223 if (nc->queue_index != 0)
1224 continue;
1225
1226 if (nc->info->query_rx_filter) {
1227 info = nc->info->query_rx_filter(nc);
1228 entry = g_malloc0(sizeof(*entry));
1229 entry->value = info;
1230
1231 if (!filter_list) {
1232 filter_list = entry;
1233 } else {
1234 last_entry->next = entry;
1235 }
1236 last_entry = entry;
1237 } else if (has_name) {
1238 error_setg(errp, "net client(%s) doesn't support"
1239 " rx-filter querying", name);
1240 return NULL;
1241 }
1242
1243 if (has_name) {
1244 break;
1245 }
1246 }
1247
1248 if (filter_list == NULL && has_name) {
1249 error_setg(errp, "invalid net client name: %s", name);
1250 }
1251
1252 return filter_list;
1253}
1254
1255void hmp_info_network(Monitor *mon, const QDict *qdict)
1256{
1257 NetClientState *nc, *peer;
1258 NetClientDriver type;
1259
1260 net_hub_info(mon);
1261
1262 QTAILQ_FOREACH(nc, &net_clients, next) {
1263 peer = nc->peer;
1264 type = nc->info->type;
1265
1266 /* Skip if already printed in hub info */
1267 if (net_hub_id_for_client(nc, NULL) == 0) {
1268 continue;
1269 }
1270
1271 if (!peer || type == NET_CLIENT_DRIVER_NIC) {
1272 print_net_client(mon, nc);
1273 } /* else it's a netdev connected to a NIC, printed with the NIC */
1274 if (peer && type == NET_CLIENT_DRIVER_NIC) {
1275 monitor_printf(mon, " \\ ");
1276 print_net_client(mon, peer);
1277 }
1278 }
1279}
1280
1281void colo_notify_filters_event(int event, Error **errp)
1282{
1283 NetClientState *nc;
1284 NetFilterState *nf;
1285 NetFilterClass *nfc = NULL;
1286 Error *local_err = NULL;
1287
1288 QTAILQ_FOREACH(nc, &net_clients, next) {
1289 QTAILQ_FOREACH(nf, &nc->filters, next) {
1290 nfc = NETFILTER_GET_CLASS(OBJECT(nf));
1291 nfc->handle_event(nf, event, &local_err);
1292 if (local_err) {
1293 error_propagate(errp, local_err);
1294 return;
1295 }
1296 }
1297 }
1298}
1299
1300void qmp_set_link(const char *name, bool up, Error **errp)
1301{
1302 NetClientState *ncs[MAX_QUEUE_NUM];
1303 NetClientState *nc;
1304 int queues, i;
1305
1306 queues = qemu_find_net_clients_except(name, ncs,
1307 NET_CLIENT_DRIVER__MAX,
1308 MAX_QUEUE_NUM);
1309
1310 if (queues == 0) {
1311 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1312 "Device '%s' not found", name);
1313 return;
1314 }
1315 nc = ncs[0];
1316
1317 for (i = 0; i < queues; i++) {
1318 ncs[i]->link_down = !up;
1319 }
1320
1321 if (nc->info->link_status_changed) {
1322 nc->info->link_status_changed(nc);
1323 }
1324
1325 if (nc->peer) {
1326 /* Change peer link only if the peer is NIC and then notify peer.
1327 * If the peer is a HUBPORT or a backend, we do not change the
1328 * link status.
1329 *
1330 * This behavior is compatible with qemu hubs where there could be
1331 * multiple clients that can still communicate with each other in
1332 * disconnected mode. For now maintain this compatibility.
1333 */
1334 if (nc->peer->info->type == NET_CLIENT_DRIVER_NIC) {
1335 for (i = 0; i < queues; i++) {
1336 ncs[i]->peer->link_down = !up;
1337 }
1338 }
1339 if (nc->peer->info->link_status_changed) {
1340 nc->peer->info->link_status_changed(nc->peer);
1341 }
1342 }
1343}
1344
1345static void net_vm_change_state_handler(void *opaque, int running,
1346 RunState state)
1347{
1348 NetClientState *nc;
1349 NetClientState *tmp;
1350
1351 QTAILQ_FOREACH_SAFE(nc, &net_clients, next, tmp) {
1352 if (running) {
1353 /* Flush queued packets and wake up backends. */
1354 if (nc->peer && qemu_can_send_packet(nc)) {
1355 qemu_flush_queued_packets(nc->peer);
1356 }
1357 } else {
1358 /* Complete all queued packets, to guarantee we don't modify
1359 * state later when VM is not running.
1360 */
1361 qemu_flush_or_purge_queued_packets(nc, true);
1362 }
1363 }
1364}
1365
1366void net_cleanup(void)
1367{
1368 NetClientState *nc;
1369
1370 /* We may del multiple entries during qemu_del_net_client(),
1371 * so QTAILQ_FOREACH_SAFE() is also not safe here.
1372 */
1373 while (!QTAILQ_EMPTY(&net_clients)) {
1374 nc = QTAILQ_FIRST(&net_clients);
1375 if (nc->info->type == NET_CLIENT_DRIVER_NIC) {
1376 qemu_del_nic(qemu_get_nic(nc));
1377 } else {
1378 qemu_del_net_client(nc);
1379 }
1380 }
1381
1382 qemu_del_vm_change_state_handler(net_change_state_entry);
1383}
1384
1385void net_check_clients(void)
1386{
1387 NetClientState *nc;
1388 int i;
1389
1390 net_hub_check_clients();
1391
1392 QTAILQ_FOREACH(nc, &net_clients, next) {
1393 if (!nc->peer) {
1394 warn_report("%s %s has no peer",
1395 nc->info->type == NET_CLIENT_DRIVER_NIC
1396 ? "nic" : "netdev",
1397 nc->name);
1398 }
1399 }
1400
1401 /* Check that all NICs requested via -net nic actually got created.
1402 * NICs created via -device don't need to be checked here because
1403 * they are always instantiated.
1404 */
1405 for (i = 0; i < MAX_NICS; i++) {
1406 NICInfo *nd = &nd_table[i];
1407 if (nd->used && !nd->instantiated) {
1408 warn_report("requested NIC (%s, model %s) "
1409 "was not created (not supported by this machine?)",
1410 nd->name ? nd->name : "anonymous",
1411 nd->model ? nd->model : "unspecified");
1412 }
1413 }
1414}
1415
1416static int net_init_client(void *dummy, QemuOpts *opts, Error **errp)
1417{
1418 return net_client_init(opts, false, errp);
1419}
1420
1421static int net_init_netdev(void *dummy, QemuOpts *opts, Error **errp)
1422{
1423 return net_client_init(opts, true, errp);
1424}
1425
1426/* For the convenience "--nic" parameter */
1427static int net_param_nic(void *dummy, QemuOpts *opts, Error **errp)
1428{
1429 char *mac, *nd_id;
1430 int idx, ret;
1431 NICInfo *ni;
1432 const char *type;
1433
1434 type = qemu_opt_get(opts, "type");
1435 if (type && g_str_equal(type, "none")) {
1436 return 0; /* Nothing to do, default_net is cleared in vl.c */
1437 }
1438
1439 idx = nic_get_free_idx();
1440 if (idx == -1 || nb_nics >= MAX_NICS) {
1441 error_setg(errp, "no more on-board/default NIC slots available");
1442 return -1;
1443 }
1444
1445 if (!type) {
1446 qemu_opt_set(opts, "type", "user", &error_abort);
1447 }
1448
1449 ni = &nd_table[idx];
1450 memset(ni, 0, sizeof(*ni));
1451 ni->model = qemu_opt_get_del(opts, "model");
1452
1453 /* Create an ID if the user did not specify one */
1454 nd_id = g_strdup(qemu_opts_id(opts));
1455 if (!nd_id) {
1456 nd_id = g_strdup_printf("__org.qemu.nic%i", idx);
1457 qemu_opts_set_id(opts, nd_id);
1458 }
1459
1460 /* Handle MAC address */
1461 mac = qemu_opt_get_del(opts, "mac");
1462 if (mac) {
1463 ret = net_parse_macaddr(ni->macaddr.a, mac);
1464 g_free(mac);
1465 if (ret) {
1466 error_setg(errp, "invalid syntax for ethernet address");
1467 goto out;
1468 }
1469 if (is_multicast_ether_addr(ni->macaddr.a)) {
1470 error_setg(errp, "NIC cannot have multicast MAC address");
1471 ret = -1;
1472 goto out;
1473 }
1474 }
1475 qemu_macaddr_default_if_unset(&ni->macaddr);
1476
1477 ret = net_client_init(opts, true, errp);
1478 if (ret == 0) {
1479 ni->netdev = qemu_find_netdev(nd_id);
1480 ni->used = true;
1481 nb_nics++;
1482 }
1483
1484out:
1485 g_free(nd_id);
1486 return ret;
1487}
1488
1489int net_init_clients(Error **errp)
1490{
1491 net_change_state_entry =
1492 qemu_add_vm_change_state_handler(net_vm_change_state_handler, NULL);
1493
1494 QTAILQ_INIT(&net_clients);
1495
1496 if (qemu_opts_foreach(qemu_find_opts("netdev"),
1497 net_init_netdev, NULL, errp)) {
1498 return -1;
1499 }
1500
1501 if (qemu_opts_foreach(qemu_find_opts("nic"), net_param_nic, NULL, errp)) {
1502 return -1;
1503 }
1504
1505 if (qemu_opts_foreach(qemu_find_opts("net"), net_init_client, NULL, errp)) {
1506 return -1;
1507 }
1508
1509 return 0;
1510}
1511
1512int net_client_parse(QemuOptsList *opts_list, const char *optarg)
1513{
1514 if (!qemu_opts_parse_noisily(opts_list, optarg, true)) {
1515 return -1;
1516 }
1517
1518 return 0;
1519}
1520
1521/* From FreeBSD */
1522/* XXX: optimize */
1523uint32_t net_crc32(const uint8_t *p, int len)
1524{
1525 uint32_t crc;
1526 int carry, i, j;
1527 uint8_t b;
1528
1529 crc = 0xffffffff;
1530 for (i = 0; i < len; i++) {
1531 b = *p++;
1532 for (j = 0; j < 8; j++) {
1533 carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01);
1534 crc <<= 1;
1535 b >>= 1;
1536 if (carry) {
1537 crc = ((crc ^ POLYNOMIAL_BE) | carry);
1538 }
1539 }
1540 }
1541
1542 return crc;
1543}
1544
1545uint32_t net_crc32_le(const uint8_t *p, int len)
1546{
1547 uint32_t crc;
1548 int carry, i, j;
1549 uint8_t b;
1550
1551 crc = 0xffffffff;
1552 for (i = 0; i < len; i++) {
1553 b = *p++;
1554 for (j = 0; j < 8; j++) {
1555 carry = (crc & 0x1) ^ (b & 0x01);
1556 crc >>= 1;
1557 b >>= 1;
1558 if (carry) {
1559 crc ^= POLYNOMIAL_LE;
1560 }
1561 }
1562 }
1563
1564 return crc;
1565}
1566
1567QemuOptsList qemu_netdev_opts = {
1568 .name = "netdev",
1569 .implied_opt_name = "type",
1570 .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head),
1571 .desc = {
1572 /*
1573 * no elements => accept any params
1574 * validation will happen later
1575 */
1576 { /* end of list */ }
1577 },
1578};
1579
1580QemuOptsList qemu_nic_opts = {
1581 .name = "nic",
1582 .implied_opt_name = "type",
1583 .head = QTAILQ_HEAD_INITIALIZER(qemu_nic_opts.head),
1584 .desc = {
1585 /*
1586 * no elements => accept any params
1587 * validation will happen later
1588 */
1589 { /* end of list */ }
1590 },
1591};
1592
1593QemuOptsList qemu_net_opts = {
1594 .name = "net",
1595 .implied_opt_name = "type",
1596 .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head),
1597 .desc = {
1598 /*
1599 * no elements => accept any params
1600 * validation will happen later
1601 */
1602 { /* end of list */ }
1603 },
1604};
1605
1606void net_socket_rs_init(SocketReadState *rs,
1607 SocketReadStateFinalize *finalize,
1608 bool vnet_hdr)
1609{
1610 rs->state = 0;
1611 rs->vnet_hdr = vnet_hdr;
1612 rs->index = 0;
1613 rs->packet_len = 0;
1614 rs->vnet_hdr_len = 0;
1615 memset(rs->buf, 0, sizeof(rs->buf));
1616 rs->finalize = finalize;
1617}
1618
1619/*
1620 * Returns
1621 * 0: success
1622 * -1: error occurs
1623 */
1624int net_fill_rstate(SocketReadState *rs, const uint8_t *buf, int size)
1625{
1626 unsigned int l;
1627
1628 while (size > 0) {
1629 /* Reassemble a packet from the network.
1630 * 0 = getting length.
1631 * 1 = getting vnet header length.
1632 * 2 = getting data.
1633 */
1634 switch (rs->state) {
1635 case 0:
1636 l = 4 - rs->index;
1637 if (l > size) {
1638 l = size;
1639 }
1640 memcpy(rs->buf + rs->index, buf, l);
1641 buf += l;
1642 size -= l;
1643 rs->index += l;
1644 if (rs->index == 4) {
1645 /* got length */
1646 rs->packet_len = ntohl(*(uint32_t *)rs->buf);
1647 rs->index = 0;
1648 if (rs->vnet_hdr) {
1649 rs->state = 1;
1650 } else {
1651 rs->state = 2;
1652 rs->vnet_hdr_len = 0;
1653 }
1654 }
1655 break;
1656 case 1:
1657 l = 4 - rs->index;
1658 if (l > size) {
1659 l = size;
1660 }
1661 memcpy(rs->buf + rs->index, buf, l);
1662 buf += l;
1663 size -= l;
1664 rs->index += l;
1665 if (rs->index == 4) {
1666 /* got vnet header length */
1667 rs->vnet_hdr_len = ntohl(*(uint32_t *)rs->buf);
1668 rs->index = 0;
1669 rs->state = 2;
1670 }
1671 break;
1672 case 2:
1673 l = rs->packet_len - rs->index;
1674 if (l > size) {
1675 l = size;
1676 }
1677 if (rs->index + l <= sizeof(rs->buf)) {
1678 memcpy(rs->buf + rs->index, buf, l);
1679 } else {
1680 fprintf(stderr, "serious error: oversized packet received,"
1681 "connection terminated.\n");
1682 rs->index = rs->state = 0;
1683 return -1;
1684 }
1685
1686 rs->index += l;
1687 buf += l;
1688 size -= l;
1689 if (rs->index >= rs->packet_len) {
1690 rs->index = 0;
1691 rs->state = 0;
1692 assert(rs->finalize);
1693 rs->finalize(rs);
1694 }
1695 break;
1696 }
1697 }
1698
1699 assert(size == 0);
1700 return 0;
1701}