hw/display/xlnx_dp: Free FIFOs adding xlnx_dp_finalize()
[qemu/ar7.git] / net / net.c
blob725a4e14500a8118f53b427cb4651dbaa1a5fbf4
1 /*
2 * QEMU System Emulator
4 * Copyright (c) 2003-2008 Fabrice Bellard
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:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
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.
25 #include "qemu/osdep.h"
26 #include "qemu-common.h"
28 #include "net/net.h"
29 #include "clients.h"
30 #include "hub.h"
31 #include "hw/qdev-properties.h"
32 #include "net/slirp.h"
33 #include "net/eth.h"
34 #include "util.h"
36 #include "monitor/monitor.h"
37 #include "qemu/help_option.h"
38 #include "qapi/qapi-commands-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/id.h"
47 #include "qemu/iov.h"
48 #include "qemu/qemu-print.h"
49 #include "qemu/main-loop.h"
50 #include "qemu/option.h"
51 #include "qapi/error.h"
52 #include "qapi/opts-visitor.h"
53 #include "sysemu/sysemu.h"
54 #include "sysemu/runstate.h"
55 #include "sysemu/sysemu.h"
56 #include "net/filter.h"
57 #include "qapi/string-output-visitor.h"
58 #include "qapi/hmp-output-visitor.h"
60 /* Net bridge is currently not supported for W32. */
61 #if !defined(_WIN32)
62 # define CONFIG_NET_BRIDGE
63 #endif
65 static VMChangeStateEntry *net_change_state_entry;
66 static QTAILQ_HEAD(, NetClientState) net_clients;
68 /***********************************************************/
69 /* network device redirectors */
71 int parse_host_port(struct sockaddr_in *saddr, const char *str,
72 Error **errp)
74 gchar **substrings;
75 struct hostent *he;
76 const char *addr, *p, *r;
77 int port, ret = 0;
79 substrings = g_strsplit(str, ":", 2);
80 if (!substrings || !substrings[0] || !substrings[1]) {
81 error_setg(errp, "host address '%s' doesn't contain ':' "
82 "separating host from port", str);
83 ret = -1;
84 goto out;
87 addr = substrings[0];
88 p = substrings[1];
90 saddr->sin_family = AF_INET;
91 if (addr[0] == '\0') {
92 saddr->sin_addr.s_addr = 0;
93 } else {
94 if (qemu_isdigit(addr[0])) {
95 if (!inet_aton(addr, &saddr->sin_addr)) {
96 error_setg(errp, "host address '%s' is not a valid "
97 "IPv4 address", addr);
98 ret = -1;
99 goto out;
101 } else {
102 he = gethostbyname(addr);
103 if (he == NULL) {
104 error_setg(errp, "can't resolve host address '%s'", addr);
105 ret = -1;
106 goto out;
108 saddr->sin_addr = *(struct in_addr *)he->h_addr;
111 port = strtol(p, (char **)&r, 0);
112 if (r == p) {
113 error_setg(errp, "port number '%s' is invalid", p);
114 ret = -1;
115 goto out;
117 saddr->sin_port = htons(port);
119 out:
120 g_strfreev(substrings);
121 return ret;
124 char *qemu_mac_strdup_printf(const uint8_t *macaddr)
126 return g_strdup_printf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x",
127 macaddr[0], macaddr[1], macaddr[2],
128 macaddr[3], macaddr[4], macaddr[5]);
131 void qemu_format_nic_info_str(NetClientState *nc, uint8_t macaddr[6])
133 g_free(nc->info_str);
134 nc->info_str = g_strdup_printf(
135 "model=%s,macaddr=%02x:%02x:%02x:%02x:%02x:%02x",
136 nc->model,
137 macaddr[0], macaddr[1], macaddr[2],
138 macaddr[3], macaddr[4], macaddr[5]);
141 static int mac_table[256] = {0};
143 static void qemu_macaddr_set_used(MACAddr *macaddr)
145 int index;
147 for (index = 0x56; index < 0xFF; index++) {
148 if (macaddr->a[5] == index) {
149 mac_table[index]++;
154 static void qemu_macaddr_set_free(MACAddr *macaddr)
156 int index;
157 static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } };
159 if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) {
160 return;
162 for (index = 0x56; index < 0xFF; index++) {
163 if (macaddr->a[5] == index) {
164 mac_table[index]--;
169 static int qemu_macaddr_get_free(void)
171 int index;
173 for (index = 0x56; index < 0xFF; index++) {
174 if (mac_table[index] == 0) {
175 return index;
179 return -1;
182 void qemu_macaddr_default_if_unset(MACAddr *macaddr)
184 static const MACAddr zero = { .a = { 0,0,0,0,0,0 } };
185 static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } };
187 if (memcmp(macaddr, &zero, sizeof(zero)) != 0) {
188 if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) {
189 return;
190 } else {
191 qemu_macaddr_set_used(macaddr);
192 return;
196 macaddr->a[0] = 0x52;
197 macaddr->a[1] = 0x54;
198 macaddr->a[2] = 0x00;
199 macaddr->a[3] = 0x12;
200 macaddr->a[4] = 0x34;
201 macaddr->a[5] = qemu_macaddr_get_free();
202 qemu_macaddr_set_used(macaddr);
206 * Generate a name for net client
208 * Only net clients created with the legacy -net option and NICs need this.
210 static char *assign_name(NetClientState *nc1, const char *model)
212 NetClientState *nc;
213 int id = 0;
215 QTAILQ_FOREACH(nc, &net_clients, next) {
216 if (nc == nc1) {
217 continue;
219 if (strcmp(nc->model, model) == 0) {
220 id++;
224 return g_strdup_printf("%s.%d", model, id);
227 static void qemu_net_client_destructor(NetClientState *nc)
229 g_free(nc);
231 static ssize_t qemu_deliver_packet_iov(NetClientState *sender,
232 unsigned flags,
233 const struct iovec *iov,
234 int iovcnt,
235 void *opaque);
237 static void qemu_net_client_setup(NetClientState *nc,
238 NetClientInfo *info,
239 NetClientState *peer,
240 const char *model,
241 const char *name,
242 NetClientDestructor *destructor)
244 nc->info = info;
245 nc->model = g_strdup(model);
246 if (name) {
247 nc->name = g_strdup(name);
248 } else {
249 nc->name = assign_name(nc, model);
252 if (peer) {
253 assert(!peer->peer);
254 nc->peer = peer;
255 peer->peer = nc;
257 QTAILQ_INSERT_TAIL(&net_clients, nc, next);
259 nc->incoming_queue = qemu_new_net_queue(qemu_deliver_packet_iov, nc);
260 nc->destructor = destructor;
261 QTAILQ_INIT(&nc->filters);
264 NetClientState *qemu_new_net_client(NetClientInfo *info,
265 NetClientState *peer,
266 const char *model,
267 const char *name)
269 NetClientState *nc;
271 assert(info->size >= sizeof(NetClientState));
273 nc = g_malloc0(info->size);
274 qemu_net_client_setup(nc, info, peer, model, name,
275 qemu_net_client_destructor);
277 return nc;
280 NICState *qemu_new_nic(NetClientInfo *info,
281 NICConf *conf,
282 const char *model,
283 const char *name,
284 void *opaque)
286 NetClientState **peers = conf->peers.ncs;
287 NICState *nic;
288 int i, queues = MAX(1, conf->peers.queues);
290 assert(info->type == NET_CLIENT_DRIVER_NIC);
291 assert(info->size >= sizeof(NICState));
293 nic = g_malloc0(info->size + sizeof(NetClientState) * queues);
294 nic->ncs = (void *)nic + info->size;
295 nic->conf = conf;
296 nic->opaque = opaque;
298 for (i = 0; i < queues; i++) {
299 qemu_net_client_setup(&nic->ncs[i], info, peers[i], model, name,
300 NULL);
301 nic->ncs[i].queue_index = i;
304 return nic;
307 NetClientState *qemu_get_subqueue(NICState *nic, int queue_index)
309 return nic->ncs + queue_index;
312 NetClientState *qemu_get_queue(NICState *nic)
314 return qemu_get_subqueue(nic, 0);
317 NICState *qemu_get_nic(NetClientState *nc)
319 NetClientState *nc0 = nc - nc->queue_index;
321 return (NICState *)((void *)nc0 - nc->info->size);
324 void *qemu_get_nic_opaque(NetClientState *nc)
326 NICState *nic = qemu_get_nic(nc);
328 return nic->opaque;
331 NetClientState *qemu_get_peer(NetClientState *nc, int queue_index)
333 assert(nc != NULL);
334 NetClientState *ncs = nc + queue_index;
335 return ncs->peer;
338 static void qemu_cleanup_net_client(NetClientState *nc)
340 QTAILQ_REMOVE(&net_clients, nc, next);
342 if (nc->info->cleanup) {
343 nc->info->cleanup(nc);
347 static void qemu_free_net_client(NetClientState *nc)
349 if (nc->incoming_queue) {
350 qemu_del_net_queue(nc->incoming_queue);
352 if (nc->peer) {
353 nc->peer->peer = NULL;
355 g_free(nc->name);
356 g_free(nc->model);
357 g_free(nc->info_str);
358 qapi_free_NetdevInfo(nc->stored_config);
359 if (nc->destructor) {
360 nc->destructor(nc);
364 void qemu_del_net_client(NetClientState *nc)
366 NetClientState *ncs[MAX_QUEUE_NUM];
367 int queues, i;
368 NetFilterState *nf, *next;
370 assert(nc->info->type != NET_CLIENT_DRIVER_NIC);
372 /* If the NetClientState belongs to a multiqueue backend, we will change all
373 * other NetClientStates also.
375 queues = qemu_find_net_clients_except(nc->name, ncs,
376 NET_CLIENT_DRIVER_NIC,
377 MAX_QUEUE_NUM);
378 assert(queues != 0);
380 QTAILQ_FOREACH_SAFE(nf, &nc->filters, next, next) {
381 object_unparent(OBJECT(nf));
384 /* If there is a peer NIC, delete and cleanup client, but do not free. */
385 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_NIC) {
386 NICState *nic = qemu_get_nic(nc->peer);
387 if (nic->peer_deleted) {
388 return;
390 nic->peer_deleted = true;
392 for (i = 0; i < queues; i++) {
393 ncs[i]->peer->link_down = true;
396 if (nc->peer->info->link_status_changed) {
397 nc->peer->info->link_status_changed(nc->peer);
400 for (i = 0; i < queues; i++) {
401 qemu_cleanup_net_client(ncs[i]);
404 return;
407 for (i = 0; i < queues; i++) {
408 qemu_cleanup_net_client(ncs[i]);
409 qemu_free_net_client(ncs[i]);
413 void qemu_del_nic(NICState *nic)
415 int i, queues = MAX(nic->conf->peers.queues, 1);
417 qemu_macaddr_set_free(&nic->conf->macaddr);
419 for (i = 0; i < queues; i++) {
420 NetClientState *nc = qemu_get_subqueue(nic, i);
421 /* If this is a peer NIC and peer has already been deleted, free it now. */
422 if (nic->peer_deleted) {
423 qemu_free_net_client(nc->peer);
424 } else if (nc->peer) {
425 /* if there are RX packets pending, complete them */
426 qemu_purge_queued_packets(nc->peer);
430 for (i = queues - 1; i >= 0; i--) {
431 NetClientState *nc = qemu_get_subqueue(nic, i);
433 qemu_cleanup_net_client(nc);
434 qemu_free_net_client(nc);
437 g_free(nic);
440 void qemu_foreach_nic(qemu_nic_foreach func, void *opaque)
442 NetClientState *nc;
444 QTAILQ_FOREACH(nc, &net_clients, next) {
445 if (nc->info->type == NET_CLIENT_DRIVER_NIC) {
446 if (nc->queue_index == 0) {
447 func(qemu_get_nic(nc), opaque);
453 bool qemu_has_ufo(NetClientState *nc)
455 if (!nc || !nc->info->has_ufo) {
456 return false;
459 return nc->info->has_ufo(nc);
462 bool qemu_has_vnet_hdr(NetClientState *nc)
464 if (!nc || !nc->info->has_vnet_hdr) {
465 return false;
468 return nc->info->has_vnet_hdr(nc);
471 bool qemu_has_vnet_hdr_len(NetClientState *nc, int len)
473 if (!nc || !nc->info->has_vnet_hdr_len) {
474 return false;
477 return nc->info->has_vnet_hdr_len(nc, len);
480 void qemu_using_vnet_hdr(NetClientState *nc, bool enable)
482 if (!nc || !nc->info->using_vnet_hdr) {
483 return;
486 nc->info->using_vnet_hdr(nc, enable);
489 void qemu_set_offload(NetClientState *nc, int csum, int tso4, int tso6,
490 int ecn, int ufo)
492 if (!nc || !nc->info->set_offload) {
493 return;
496 nc->info->set_offload(nc, csum, tso4, tso6, ecn, ufo);
499 void qemu_set_vnet_hdr_len(NetClientState *nc, int len)
501 if (!nc || !nc->info->set_vnet_hdr_len) {
502 return;
505 nc->vnet_hdr_len = len;
506 nc->info->set_vnet_hdr_len(nc, len);
509 int qemu_set_vnet_le(NetClientState *nc, bool is_le)
511 #ifdef HOST_WORDS_BIGENDIAN
512 if (!nc || !nc->info->set_vnet_le) {
513 return -ENOSYS;
516 return nc->info->set_vnet_le(nc, is_le);
517 #else
518 return 0;
519 #endif
522 int qemu_set_vnet_be(NetClientState *nc, bool is_be)
524 #ifdef HOST_WORDS_BIGENDIAN
525 return 0;
526 #else
527 if (!nc || !nc->info->set_vnet_be) {
528 return -ENOSYS;
531 return nc->info->set_vnet_be(nc, is_be);
532 #endif
535 int qemu_can_receive_packet(NetClientState *nc)
537 if (nc->receive_disabled) {
538 return 0;
539 } else if (nc->info->can_receive &&
540 !nc->info->can_receive(nc)) {
541 return 0;
543 return 1;
546 int qemu_can_send_packet(NetClientState *sender)
548 int vm_running = runstate_is_running();
550 if (!vm_running) {
551 return 0;
554 if (!sender->peer) {
555 return 1;
558 return qemu_can_receive_packet(sender->peer);
561 static ssize_t filter_receive_iov(NetClientState *nc,
562 NetFilterDirection direction,
563 NetClientState *sender,
564 unsigned flags,
565 const struct iovec *iov,
566 int iovcnt,
567 NetPacketSent *sent_cb)
569 ssize_t ret = 0;
570 NetFilterState *nf = NULL;
572 if (direction == NET_FILTER_DIRECTION_TX) {
573 QTAILQ_FOREACH(nf, &nc->filters, next) {
574 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov,
575 iovcnt, sent_cb);
576 if (ret) {
577 return ret;
580 } else {
581 QTAILQ_FOREACH_REVERSE(nf, &nc->filters, next) {
582 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov,
583 iovcnt, sent_cb);
584 if (ret) {
585 return ret;
590 return ret;
593 static ssize_t filter_receive(NetClientState *nc,
594 NetFilterDirection direction,
595 NetClientState *sender,
596 unsigned flags,
597 const uint8_t *data,
598 size_t size,
599 NetPacketSent *sent_cb)
601 struct iovec iov = {
602 .iov_base = (void *)data,
603 .iov_len = size
606 return filter_receive_iov(nc, direction, sender, flags, &iov, 1, sent_cb);
609 void qemu_purge_queued_packets(NetClientState *nc)
611 if (!nc->peer) {
612 return;
615 qemu_net_queue_purge(nc->peer->incoming_queue, nc);
618 void qemu_flush_or_purge_queued_packets(NetClientState *nc, bool purge)
620 nc->receive_disabled = 0;
622 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_HUBPORT) {
623 if (net_hub_flush(nc->peer)) {
624 qemu_notify_event();
627 if (qemu_net_queue_flush(nc->incoming_queue)) {
628 /* We emptied the queue successfully, signal to the IO thread to repoll
629 * the file descriptor (for tap, for example).
631 qemu_notify_event();
632 } else if (purge) {
633 /* Unable to empty the queue, purge remaining packets */
634 qemu_net_queue_purge(nc->incoming_queue, nc->peer);
638 void qemu_flush_queued_packets(NetClientState *nc)
640 qemu_flush_or_purge_queued_packets(nc, false);
643 static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender,
644 unsigned flags,
645 const uint8_t *buf, int size,
646 NetPacketSent *sent_cb)
648 NetQueue *queue;
649 int ret;
651 #ifdef DEBUG_NET
652 printf("qemu_send_packet_async:\n");
653 qemu_hexdump(stdout, "net", buf, size);
654 #endif
656 if (sender->link_down || !sender->peer) {
657 return size;
660 /* Let filters handle the packet first */
661 ret = filter_receive(sender, NET_FILTER_DIRECTION_TX,
662 sender, flags, buf, size, sent_cb);
663 if (ret) {
664 return ret;
667 ret = filter_receive(sender->peer, NET_FILTER_DIRECTION_RX,
668 sender, flags, buf, size, sent_cb);
669 if (ret) {
670 return ret;
673 queue = sender->peer->incoming_queue;
675 return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb);
678 ssize_t qemu_send_packet_async(NetClientState *sender,
679 const uint8_t *buf, int size,
680 NetPacketSent *sent_cb)
682 return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE,
683 buf, size, sent_cb);
686 ssize_t qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size)
688 return qemu_send_packet_async(nc, buf, size, NULL);
691 ssize_t qemu_receive_packet(NetClientState *nc, const uint8_t *buf, int size)
693 if (!qemu_can_receive_packet(nc)) {
694 return 0;
697 return qemu_net_queue_receive(nc->incoming_queue, buf, size);
700 ssize_t qemu_receive_packet_iov(NetClientState *nc, const struct iovec *iov,
701 int iovcnt)
703 if (!qemu_can_receive_packet(nc)) {
704 return 0;
707 return qemu_net_queue_receive_iov(nc->incoming_queue, iov, iovcnt);
710 ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size)
712 return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW,
713 buf, size, NULL);
716 static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov,
717 int iovcnt, unsigned flags)
719 uint8_t *buf = NULL;
720 uint8_t *buffer;
721 size_t offset;
722 ssize_t ret;
724 if (iovcnt == 1) {
725 buffer = iov[0].iov_base;
726 offset = iov[0].iov_len;
727 } else {
728 offset = iov_size(iov, iovcnt);
729 if (offset > NET_BUFSIZE) {
730 return -1;
732 buf = g_malloc(offset);
733 buffer = buf;
734 offset = iov_to_buf(iov, iovcnt, 0, buf, offset);
737 if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) {
738 ret = nc->info->receive_raw(nc, buffer, offset);
739 } else {
740 ret = nc->info->receive(nc, buffer, offset);
743 g_free(buf);
744 return ret;
747 static ssize_t qemu_deliver_packet_iov(NetClientState *sender,
748 unsigned flags,
749 const struct iovec *iov,
750 int iovcnt,
751 void *opaque)
753 NetClientState *nc = opaque;
754 int ret;
757 if (nc->link_down) {
758 return iov_size(iov, iovcnt);
761 if (nc->receive_disabled) {
762 return 0;
765 if (nc->info->receive_iov && !(flags & QEMU_NET_PACKET_FLAG_RAW)) {
766 ret = nc->info->receive_iov(nc, iov, iovcnt);
767 } else {
768 ret = nc_sendv_compat(nc, iov, iovcnt, flags);
771 if (ret == 0) {
772 nc->receive_disabled = 1;
775 return ret;
778 ssize_t qemu_sendv_packet_async(NetClientState *sender,
779 const struct iovec *iov, int iovcnt,
780 NetPacketSent *sent_cb)
782 NetQueue *queue;
783 size_t size = iov_size(iov, iovcnt);
784 int ret;
786 if (size > NET_BUFSIZE) {
787 return size;
790 if (sender->link_down || !sender->peer) {
791 return size;
794 /* Let filters handle the packet first */
795 ret = filter_receive_iov(sender, NET_FILTER_DIRECTION_TX, sender,
796 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb);
797 if (ret) {
798 return ret;
801 ret = filter_receive_iov(sender->peer, NET_FILTER_DIRECTION_RX, sender,
802 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb);
803 if (ret) {
804 return ret;
807 queue = sender->peer->incoming_queue;
809 return qemu_net_queue_send_iov(queue, sender,
810 QEMU_NET_PACKET_FLAG_NONE,
811 iov, iovcnt, sent_cb);
814 ssize_t
815 qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt)
817 return qemu_sendv_packet_async(nc, iov, iovcnt, NULL);
820 NetClientState *qemu_find_netdev(const char *id)
822 NetClientState *nc;
824 QTAILQ_FOREACH(nc, &net_clients, next) {
825 if (nc->info->type == NET_CLIENT_DRIVER_NIC)
826 continue;
827 if (!strcmp(nc->name, id)) {
828 return nc;
832 return NULL;
835 int qemu_find_net_clients_except(const char *id, NetClientState **ncs,
836 NetClientDriver type, int max)
838 NetClientState *nc;
839 int ret = 0;
841 QTAILQ_FOREACH(nc, &net_clients, next) {
842 if (nc->info->type == type) {
843 continue;
845 if (!id || !strcmp(nc->name, id)) {
846 if (ret < max) {
847 ncs[ret] = nc;
849 ret++;
853 return ret;
856 static int nic_get_free_idx(void)
858 int index;
860 for (index = 0; index < MAX_NICS; index++)
861 if (!nd_table[index].used)
862 return index;
863 return -1;
866 int qemu_show_nic_models(const char *arg, const char *const *models)
868 int i;
870 if (!arg || !is_help_option(arg)) {
871 return 0;
874 printf("Supported NIC models:\n");
875 for (i = 0 ; models[i]; i++) {
876 printf("%s\n", models[i]);
878 return 1;
881 void qemu_check_nic_model(NICInfo *nd, const char *model)
883 const char *models[2];
885 models[0] = model;
886 models[1] = NULL;
888 if (qemu_show_nic_models(nd->model, models))
889 exit(0);
890 if (qemu_find_nic_model(nd, models, model) < 0)
891 exit(1);
894 int qemu_find_nic_model(NICInfo *nd, const char * const *models,
895 const char *default_model)
897 int i;
899 if (!nd->model)
900 nd->model = g_strdup(default_model);
902 for (i = 0 ; models[i]; i++) {
903 if (strcmp(nd->model, models[i]) == 0)
904 return i;
907 error_report("Unsupported NIC model: %s", nd->model);
908 return -1;
911 static int net_init_nic(const Netdev *netdev, const char *name,
912 NetClientState *peer, Error **errp)
914 int idx;
915 NICInfo *nd;
916 const NetLegacyNicOptions *nic;
918 assert(netdev->type == NET_CLIENT_DRIVER_NIC);
919 nic = &netdev->u.nic;
921 idx = nic_get_free_idx();
922 if (idx == -1 || nb_nics >= MAX_NICS) {
923 error_setg(errp, "too many NICs");
924 return -1;
927 nd = &nd_table[idx];
929 memset(nd, 0, sizeof(*nd));
931 if (nic->has_netdev) {
932 nd->netdev = qemu_find_netdev(nic->netdev);
933 if (!nd->netdev) {
934 error_setg(errp, "netdev '%s' not found", nic->netdev);
935 return -1;
937 } else {
938 assert(peer);
939 nd->netdev = peer;
941 nd->name = g_strdup(name);
942 if (nic->has_model) {
943 nd->model = g_strdup(nic->model);
945 if (nic->has_addr) {
946 nd->devaddr = g_strdup(nic->addr);
949 if (nic->has_macaddr &&
950 net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) {
951 error_setg(errp, "invalid syntax for ethernet address");
952 return -1;
954 if (nic->has_macaddr &&
955 is_multicast_ether_addr(nd->macaddr.a)) {
956 error_setg(errp,
957 "NIC cannot have multicast MAC address (odd 1st byte)");
958 return -1;
960 qemu_macaddr_default_if_unset(&nd->macaddr);
962 if (nic->has_vectors) {
963 if (nic->vectors > 0x7ffffff) {
964 error_setg(errp, "invalid # of vectors: %"PRIu32, nic->vectors);
965 return -1;
967 nd->nvectors = nic->vectors;
968 } else {
969 nd->nvectors = DEV_NVECTORS_UNSPECIFIED;
972 nd->used = 1;
973 nb_nics++;
975 return idx;
979 static int (* const net_client_init_fun[NET_CLIENT_DRIVER__MAX])(
980 const Netdev *netdev,
981 const char *name,
982 NetClientState *peer, Error **errp) = {
983 [NET_CLIENT_DRIVER_NIC] = net_init_nic,
984 #ifdef CONFIG_SLIRP
985 [NET_CLIENT_DRIVER_USER] = net_init_slirp,
986 #endif
987 [NET_CLIENT_DRIVER_TAP] = net_init_tap,
988 [NET_CLIENT_DRIVER_SOCKET] = net_init_socket,
989 #ifdef CONFIG_VDE
990 [NET_CLIENT_DRIVER_VDE] = net_init_vde,
991 #endif
992 #ifdef CONFIG_NETMAP
993 [NET_CLIENT_DRIVER_NETMAP] = net_init_netmap,
994 #endif
995 #ifdef CONFIG_NET_BRIDGE
996 [NET_CLIENT_DRIVER_BRIDGE] = net_init_bridge,
997 #endif
998 [NET_CLIENT_DRIVER_HUBPORT] = net_init_hubport,
999 #ifdef CONFIG_VHOST_NET_USER
1000 [NET_CLIENT_DRIVER_VHOST_USER] = net_init_vhost_user,
1001 #endif
1002 #ifdef CONFIG_VHOST_NET_VDPA
1003 [NET_CLIENT_DRIVER_VHOST_VDPA] = net_init_vhost_vdpa,
1004 #endif
1005 #ifdef CONFIG_L2TPV3
1006 [NET_CLIENT_DRIVER_L2TPV3] = net_init_l2tpv3,
1007 #endif
1011 static int net_client_init1(const Netdev *netdev, bool is_netdev, Error **errp)
1013 NetClientState *peer = NULL;
1014 NetClientState *nc;
1016 if (is_netdev) {
1017 if (netdev->type == NET_CLIENT_DRIVER_NIC ||
1018 !net_client_init_fun[netdev->type]) {
1019 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
1020 "a netdev backend type");
1021 return -1;
1023 } else {
1024 if (netdev->type == NET_CLIENT_DRIVER_NONE) {
1025 return 0; /* nothing to do */
1027 if (netdev->type == NET_CLIENT_DRIVER_HUBPORT ||
1028 !net_client_init_fun[netdev->type]) {
1029 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
1030 "a net backend type (maybe it is not compiled "
1031 "into this binary)");
1032 return -1;
1035 /* Do not add to a hub if it's a nic with a netdev= parameter. */
1036 if (netdev->type != NET_CLIENT_DRIVER_NIC ||
1037 !netdev->u.nic.has_netdev) {
1038 peer = net_hub_add_port(0, NULL, NULL);
1042 nc = qemu_find_netdev(netdev->id);
1043 if (nc) {
1044 error_setg(errp, "Duplicate ID '%s'", netdev->id);
1045 return -1;
1048 if (net_client_init_fun[netdev->type](netdev, netdev->id, peer, errp) < 0) {
1049 /* FIXME drop when all init functions store an Error */
1050 if (errp && !*errp) {
1051 error_setg(errp, "Device '%s' could not be initialized",
1052 NetClientDriver_str(netdev->type));
1054 return -1;
1057 if (is_netdev) {
1058 nc = qemu_find_netdev(netdev->id);
1059 assert(nc);
1060 nc->is_netdev = true;
1063 return 0;
1066 void show_netdevs(void)
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 #ifdef CONFIG_VHOST_VDPA
1092 "vhost-vdpa",
1093 #endif
1096 qemu_printf("Available netdev backend types:\n");
1097 for (idx = 0; idx < ARRAY_SIZE(available_netdevs); idx++) {
1098 qemu_printf("%s\n", available_netdevs[idx]);
1102 static int net_client_init(QemuOpts *opts, bool is_netdev, Error **errp)
1104 gchar **substrings = NULL;
1105 Netdev *object = NULL;
1106 int ret = -1;
1107 Visitor *v = opts_visitor_new(opts);
1109 /* Parse convenience option format ip6-net=fec0::0[/64] */
1110 const char *ip6_net = qemu_opt_get(opts, "ipv6-net");
1112 if (ip6_net) {
1113 char *prefix_addr;
1114 unsigned long prefix_len = 64; /* Default 64bit prefix length. */
1116 substrings = g_strsplit(ip6_net, "/", 2);
1117 if (!substrings || !substrings[0]) {
1118 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "ipv6-net",
1119 "a valid IPv6 prefix");
1120 goto out;
1123 prefix_addr = substrings[0];
1125 /* Handle user-specified prefix length. */
1126 if (substrings[1] &&
1127 qemu_strtoul(substrings[1], NULL, 10, &prefix_len))
1129 error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1130 "ipv6-prefixlen", "a number");
1131 goto out;
1134 qemu_opt_set(opts, "ipv6-prefix", prefix_addr, &error_abort);
1135 qemu_opt_set_number(opts, "ipv6-prefixlen", prefix_len,
1136 &error_abort);
1137 qemu_opt_unset(opts, "ipv6-net");
1140 /* Create an ID for -net if the user did not specify one */
1141 if (!is_netdev && !qemu_opts_id(opts)) {
1142 qemu_opts_set_id(opts, id_generate(ID_NET));
1145 if (visit_type_Netdev(v, NULL, &object, errp)) {
1146 ret = net_client_init1(object, is_netdev, errp);
1149 qapi_free_Netdev(object);
1151 out:
1152 g_strfreev(substrings);
1153 visit_free(v);
1154 return ret;
1157 void netdev_add(QemuOpts *opts, Error **errp)
1159 net_client_init(opts, true, errp);
1162 void qmp_netdev_add(Netdev *netdev, Error **errp)
1164 if (!id_wellformed(netdev->id)) {
1165 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "id", "an identifier");
1166 return;
1169 net_client_init1(netdev, true, errp);
1172 void qmp_netdev_del(const char *id, Error **errp)
1174 NetClientState *nc;
1175 QemuOpts *opts;
1177 nc = qemu_find_netdev(id);
1178 if (!nc) {
1179 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1180 "Device '%s' not found", id);
1181 return;
1184 if (!nc->is_netdev) {
1185 error_setg(errp, "Device '%s' is not a netdev", id);
1186 return;
1189 qemu_del_net_client(nc);
1192 * Wart: we need to delete the QemuOpts associated with netdevs
1193 * created via CLI or HMP, to avoid bogus "Duplicate ID" errors in
1194 * HMP netdev_add.
1196 opts = qemu_opts_find(qemu_find_opts("netdev"), id);
1197 if (opts) {
1198 qemu_opts_del(opts);
1202 static void netfilter_print_info(Monitor *mon, NetFilterState *nf)
1204 char *str;
1205 ObjectProperty *prop;
1206 ObjectPropertyIterator iter;
1207 Visitor *v;
1209 /* generate info str */
1210 object_property_iter_init(&iter, OBJECT(nf));
1211 while ((prop = object_property_iter_next(&iter))) {
1212 if (!strcmp(prop->name, "type")) {
1213 continue;
1215 v = string_output_visitor_new(false, &str);
1216 object_property_get(OBJECT(nf), prop->name, v, NULL);
1217 visit_complete(v, &str);
1218 visit_free(v);
1219 monitor_printf(mon, ",%s=%s", prop->name, str);
1220 g_free(str);
1222 monitor_printf(mon, "\n");
1225 static char *generate_info_str(NetClientState *nc)
1227 NetdevInfo *ni = nc->stored_config;
1228 char *ret_out = NULL;
1229 Visitor *v;
1231 /* Use legacy field info_str for NIC and hubports */
1232 if ((nc->info->type == NET_CLIENT_DRIVER_NIC) ||
1233 (nc->info->type == NET_CLIENT_DRIVER_HUBPORT)) {
1234 return g_strdup(nc->info_str ? nc->info_str : "");
1237 if (!ni) {
1238 return g_malloc0(1);
1241 v = hmp_output_visitor_new(&ret_out);
1242 if (visit_type_NetdevInfo(v, "", &ni, NULL)) {
1243 visit_complete(v, &ret_out);
1245 visit_free(v);
1247 return ret_out;
1250 void print_net_client(Monitor *mon, NetClientState *nc)
1252 NetFilterState *nf;
1253 char *info_str = generate_info_str(nc);
1255 monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name,
1256 nc->queue_index,
1257 NetClientDriver_str(nc->info->type),
1258 info_str);
1259 g_free(info_str);
1261 if (!QTAILQ_EMPTY(&nc->filters)) {
1262 monitor_printf(mon, "filters:\n");
1264 QTAILQ_FOREACH(nf, &nc->filters, next) {
1265 monitor_printf(mon, " - %s: type=%s",
1266 object_get_canonical_path_component(OBJECT(nf)),
1267 object_get_typename(OBJECT(nf)));
1268 netfilter_print_info(mon, nf);
1272 RxFilterInfoList *qmp_query_rx_filter(bool has_name, const char *name,
1273 Error **errp)
1275 NetClientState *nc;
1276 RxFilterInfoList *filter_list = NULL, **tail = &filter_list;
1278 QTAILQ_FOREACH(nc, &net_clients, next) {
1279 RxFilterInfo *info;
1281 if (has_name && strcmp(nc->name, name) != 0) {
1282 continue;
1285 /* only query rx-filter information of NIC */
1286 if (nc->info->type != NET_CLIENT_DRIVER_NIC) {
1287 if (has_name) {
1288 error_setg(errp, "net client(%s) isn't a NIC", name);
1289 assert(!filter_list);
1290 return NULL;
1292 continue;
1295 /* only query information on queue 0 since the info is per nic,
1296 * not per queue
1298 if (nc->queue_index != 0)
1299 continue;
1301 if (nc->info->query_rx_filter) {
1302 info = nc->info->query_rx_filter(nc);
1303 QAPI_LIST_APPEND(tail, info);
1304 } else if (has_name) {
1305 error_setg(errp, "net client(%s) doesn't support"
1306 " rx-filter querying", name);
1307 assert(!filter_list);
1308 return NULL;
1311 if (has_name) {
1312 break;
1316 if (filter_list == NULL && has_name) {
1317 error_setg(errp, "invalid net client name: %s", name);
1320 return filter_list;
1323 NetdevInfoList *qmp_query_netdev(Error **errp)
1325 NetdevInfoList *list = NULL;
1326 NetClientState *nc;
1328 QTAILQ_FOREACH(nc, &net_clients, next) {
1330 * Only look at netdevs (backend network devices), not for each queue
1331 * or NIC / hubport
1333 if (nc->stored_config) {
1334 NetdevInfo *element = QAPI_CLONE(NetdevInfo, nc->stored_config);
1336 g_free(element->id); /* Need to dealloc empty id after clone */
1337 element->id = g_strdup(nc->name);
1339 element->has_peer_id = nc->peer != NULL;
1340 if (element->has_peer_id) {
1341 element->peer_id = g_strdup(nc->peer->name);
1344 QAPI_LIST_PREPEND(list, element);
1348 return list;
1351 void hmp_info_network(Monitor *mon, const QDict *qdict)
1353 NetClientState *nc, *peer;
1354 NetClientDriver type;
1356 net_hub_info(mon);
1358 QTAILQ_FOREACH(nc, &net_clients, next) {
1359 peer = nc->peer;
1360 type = nc->info->type;
1362 /* Skip if already printed in hub info */
1363 if (net_hub_id_for_client(nc, NULL) == 0) {
1364 continue;
1367 if (!peer || type == NET_CLIENT_DRIVER_NIC) {
1368 print_net_client(mon, nc);
1369 } /* else it's a netdev connected to a NIC, printed with the NIC */
1370 if (peer && type == NET_CLIENT_DRIVER_NIC) {
1371 monitor_printf(mon, " \\ ");
1372 print_net_client(mon, peer);
1377 void colo_notify_filters_event(int event, Error **errp)
1379 NetClientState *nc;
1380 NetFilterState *nf;
1381 NetFilterClass *nfc = NULL;
1382 Error *local_err = NULL;
1384 QTAILQ_FOREACH(nc, &net_clients, next) {
1385 QTAILQ_FOREACH(nf, &nc->filters, next) {
1386 nfc = NETFILTER_GET_CLASS(OBJECT(nf));
1387 nfc->handle_event(nf, event, &local_err);
1388 if (local_err) {
1389 error_propagate(errp, local_err);
1390 return;
1396 void qmp_set_link(const char *name, bool up, Error **errp)
1398 NetClientState *ncs[MAX_QUEUE_NUM];
1399 NetClientState *nc;
1400 int queues, i;
1402 queues = qemu_find_net_clients_except(name, ncs,
1403 NET_CLIENT_DRIVER__MAX,
1404 MAX_QUEUE_NUM);
1406 if (queues == 0) {
1407 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1408 "Device '%s' not found", name);
1409 return;
1411 nc = ncs[0];
1413 for (i = 0; i < queues; i++) {
1414 ncs[i]->link_down = !up;
1417 if (nc->info->link_status_changed) {
1418 nc->info->link_status_changed(nc);
1421 if (nc->peer) {
1422 /* Change peer link only if the peer is NIC and then notify peer.
1423 * If the peer is a HUBPORT or a backend, we do not change the
1424 * link status.
1426 * This behavior is compatible with qemu hubs where there could be
1427 * multiple clients that can still communicate with each other in
1428 * disconnected mode. For now maintain this compatibility.
1430 if (nc->peer->info->type == NET_CLIENT_DRIVER_NIC) {
1431 for (i = 0; i < queues; i++) {
1432 ncs[i]->peer->link_down = !up;
1435 if (nc->peer->info->link_status_changed) {
1436 nc->peer->info->link_status_changed(nc->peer);
1441 static void net_vm_change_state_handler(void *opaque, bool running,
1442 RunState state)
1444 NetClientState *nc;
1445 NetClientState *tmp;
1447 QTAILQ_FOREACH_SAFE(nc, &net_clients, next, tmp) {
1448 if (running) {
1449 /* Flush queued packets and wake up backends. */
1450 if (nc->peer && qemu_can_send_packet(nc)) {
1451 qemu_flush_queued_packets(nc->peer);
1453 } else {
1454 /* Complete all queued packets, to guarantee we don't modify
1455 * state later when VM is not running.
1457 qemu_flush_or_purge_queued_packets(nc, true);
1462 void net_cleanup(void)
1464 NetClientState *nc;
1466 /* We may del multiple entries during qemu_del_net_client(),
1467 * so QTAILQ_FOREACH_SAFE() is also not safe here.
1469 while (!QTAILQ_EMPTY(&net_clients)) {
1470 nc = QTAILQ_FIRST(&net_clients);
1471 if (nc->info->type == NET_CLIENT_DRIVER_NIC) {
1472 qemu_del_nic(qemu_get_nic(nc));
1473 } else {
1474 qemu_del_net_client(nc);
1478 qemu_del_vm_change_state_handler(net_change_state_entry);
1481 void net_check_clients(void)
1483 NetClientState *nc;
1484 int i;
1486 net_hub_check_clients();
1488 QTAILQ_FOREACH(nc, &net_clients, next) {
1489 if (!nc->peer) {
1490 warn_report("%s %s has no peer",
1491 nc->info->type == NET_CLIENT_DRIVER_NIC
1492 ? "nic" : "netdev",
1493 nc->name);
1497 /* Check that all NICs requested via -net nic actually got created.
1498 * NICs created via -device don't need to be checked here because
1499 * they are always instantiated.
1501 for (i = 0; i < MAX_NICS; i++) {
1502 NICInfo *nd = &nd_table[i];
1503 if (nd->used && !nd->instantiated) {
1504 warn_report("requested NIC (%s, model %s) "
1505 "was not created (not supported by this machine?)",
1506 nd->name ? nd->name : "anonymous",
1507 nd->model ? nd->model : "unspecified");
1512 static int net_init_client(void *dummy, QemuOpts *opts, Error **errp)
1514 return net_client_init(opts, false, errp);
1517 static int net_init_netdev(void *dummy, QemuOpts *opts, Error **errp)
1519 const char *type = qemu_opt_get(opts, "type");
1521 if (type && is_help_option(type)) {
1522 show_netdevs();
1523 exit(0);
1525 return net_client_init(opts, true, errp);
1528 /* For the convenience "--nic" parameter */
1529 static int net_param_nic(void *dummy, QemuOpts *opts, Error **errp)
1531 char *mac, *nd_id;
1532 int idx, ret;
1533 NICInfo *ni;
1534 const char *type;
1536 type = qemu_opt_get(opts, "type");
1537 if (type && g_str_equal(type, "none")) {
1538 return 0; /* Nothing to do, default_net is cleared in vl.c */
1541 idx = nic_get_free_idx();
1542 if (idx == -1 || nb_nics >= MAX_NICS) {
1543 error_setg(errp, "no more on-board/default NIC slots available");
1544 return -1;
1547 if (!type) {
1548 qemu_opt_set(opts, "type", "user", &error_abort);
1551 ni = &nd_table[idx];
1552 memset(ni, 0, sizeof(*ni));
1553 ni->model = qemu_opt_get_del(opts, "model");
1555 /* Create an ID if the user did not specify one */
1556 nd_id = g_strdup(qemu_opts_id(opts));
1557 if (!nd_id) {
1558 nd_id = id_generate(ID_NET);
1559 qemu_opts_set_id(opts, nd_id);
1562 /* Handle MAC address */
1563 mac = qemu_opt_get_del(opts, "mac");
1564 if (mac) {
1565 ret = net_parse_macaddr(ni->macaddr.a, mac);
1566 g_free(mac);
1567 if (ret) {
1568 error_setg(errp, "invalid syntax for ethernet address");
1569 goto out;
1571 if (is_multicast_ether_addr(ni->macaddr.a)) {
1572 error_setg(errp, "NIC cannot have multicast MAC address");
1573 ret = -1;
1574 goto out;
1577 qemu_macaddr_default_if_unset(&ni->macaddr);
1579 ret = net_client_init(opts, true, errp);
1580 if (ret == 0) {
1581 ni->netdev = qemu_find_netdev(nd_id);
1582 ni->used = true;
1583 nb_nics++;
1586 out:
1587 g_free(nd_id);
1588 return ret;
1591 int net_init_clients(Error **errp)
1593 net_change_state_entry =
1594 qemu_add_vm_change_state_handler(net_vm_change_state_handler, NULL);
1596 QTAILQ_INIT(&net_clients);
1598 if (qemu_opts_foreach(qemu_find_opts("netdev"),
1599 net_init_netdev, NULL, errp)) {
1600 return -1;
1603 if (qemu_opts_foreach(qemu_find_opts("nic"), net_param_nic, NULL, errp)) {
1604 return -1;
1607 if (qemu_opts_foreach(qemu_find_opts("net"), net_init_client, NULL, errp)) {
1608 return -1;
1611 return 0;
1614 int net_client_parse(QemuOptsList *opts_list, const char *optarg)
1616 if (!qemu_opts_parse_noisily(opts_list, optarg, true)) {
1617 return -1;
1620 return 0;
1623 /* From FreeBSD */
1624 /* XXX: optimize */
1625 uint32_t net_crc32(const uint8_t *p, int len)
1627 uint32_t crc;
1628 int carry, i, j;
1629 uint8_t b;
1631 crc = 0xffffffff;
1632 for (i = 0; i < len; i++) {
1633 b = *p++;
1634 for (j = 0; j < 8; j++) {
1635 carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01);
1636 crc <<= 1;
1637 b >>= 1;
1638 if (carry) {
1639 crc = ((crc ^ POLYNOMIAL_BE) | carry);
1644 return crc;
1647 uint32_t net_crc32_le(const uint8_t *p, int len)
1649 uint32_t crc;
1650 int carry, i, j;
1651 uint8_t b;
1653 crc = 0xffffffff;
1654 for (i = 0; i < len; i++) {
1655 b = *p++;
1656 for (j = 0; j < 8; j++) {
1657 carry = (crc & 0x1) ^ (b & 0x01);
1658 crc >>= 1;
1659 b >>= 1;
1660 if (carry) {
1661 crc ^= POLYNOMIAL_LE;
1666 return crc;
1669 QemuOptsList qemu_netdev_opts = {
1670 .name = "netdev",
1671 .implied_opt_name = "type",
1672 .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head),
1673 .desc = {
1675 * no elements => accept any params
1676 * validation will happen later
1678 { /* end of list */ }
1682 QemuOptsList qemu_nic_opts = {
1683 .name = "nic",
1684 .implied_opt_name = "type",
1685 .head = QTAILQ_HEAD_INITIALIZER(qemu_nic_opts.head),
1686 .desc = {
1688 * no elements => accept any params
1689 * validation will happen later
1691 { /* end of list */ }
1695 QemuOptsList qemu_net_opts = {
1696 .name = "net",
1697 .implied_opt_name = "type",
1698 .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head),
1699 .desc = {
1701 * no elements => accept any params
1702 * validation will happen later
1704 { /* end of list */ }
1708 void net_socket_rs_init(SocketReadState *rs,
1709 SocketReadStateFinalize *finalize,
1710 bool vnet_hdr)
1712 rs->state = 0;
1713 rs->vnet_hdr = vnet_hdr;
1714 rs->index = 0;
1715 rs->packet_len = 0;
1716 rs->vnet_hdr_len = 0;
1717 memset(rs->buf, 0, sizeof(rs->buf));
1718 rs->finalize = finalize;
1722 * Returns
1723 * 0: success
1724 * -1: error occurs
1726 int net_fill_rstate(SocketReadState *rs, const uint8_t *buf, int size)
1728 unsigned int l;
1730 while (size > 0) {
1731 /* Reassemble a packet from the network.
1732 * 0 = getting length.
1733 * 1 = getting vnet header length.
1734 * 2 = getting data.
1736 switch (rs->state) {
1737 case 0:
1738 l = 4 - rs->index;
1739 if (l > size) {
1740 l = size;
1742 memcpy(rs->buf + rs->index, buf, l);
1743 buf += l;
1744 size -= l;
1745 rs->index += l;
1746 if (rs->index == 4) {
1747 /* got length */
1748 rs->packet_len = ntohl(*(uint32_t *)rs->buf);
1749 rs->index = 0;
1750 if (rs->vnet_hdr) {
1751 rs->state = 1;
1752 } else {
1753 rs->state = 2;
1754 rs->vnet_hdr_len = 0;
1757 break;
1758 case 1:
1759 l = 4 - rs->index;
1760 if (l > size) {
1761 l = size;
1763 memcpy(rs->buf + rs->index, buf, l);
1764 buf += l;
1765 size -= l;
1766 rs->index += l;
1767 if (rs->index == 4) {
1768 /* got vnet header length */
1769 rs->vnet_hdr_len = ntohl(*(uint32_t *)rs->buf);
1770 rs->index = 0;
1771 rs->state = 2;
1773 break;
1774 case 2:
1775 l = rs->packet_len - rs->index;
1776 if (l > size) {
1777 l = size;
1779 if (rs->index + l <= sizeof(rs->buf)) {
1780 memcpy(rs->buf + rs->index, buf, l);
1781 } else {
1782 fprintf(stderr, "serious error: oversized packet received,"
1783 "connection terminated.\n");
1784 rs->index = rs->state = 0;
1785 return -1;
1788 rs->index += l;
1789 buf += l;
1790 size -= l;
1791 if (rs->index >= rs->packet_len) {
1792 rs->index = 0;
1793 rs->state = 0;
1794 assert(rs->finalize);
1795 rs->finalize(rs);
1797 break;
1801 assert(size == 0);
1802 return 0;