target/arm: Only implement doubles if the FPU supports them
[qemu/ar7.git] / net / net.c
blob3e65c93920904751ea84582b699b7ce349cb8dad
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"
27 #include "net/net.h"
28 #include "clients.h"
29 #include "hub.h"
30 #include "net/slirp.h"
31 #include "net/eth.h"
32 #include "util.h"
34 #include "monitor/monitor.h"
35 #include "qemu/help_option.h"
36 #include "qapi/qapi-commands-net.h"
37 #include "qapi/qapi-visit-net.h"
38 #include "qapi/qmp/qdict.h"
39 #include "qapi/qmp/qerror.h"
40 #include "qemu/error-report.h"
41 #include "qemu/sockets.h"
42 #include "qemu/cutils.h"
43 #include "qemu/config-file.h"
44 #include "qemu/ctype.h"
45 #include "hw/qdev.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 "net/filter.h"
54 #include "qapi/string-output-visitor.h"
56 /* Net bridge is currently not supported for W32. */
57 #if !defined(_WIN32)
58 # define CONFIG_NET_BRIDGE
59 #endif
61 static VMChangeStateEntry *net_change_state_entry;
62 static QTAILQ_HEAD(, NetClientState) net_clients;
64 /***********************************************************/
65 /* network device redirectors */
67 static int get_str_sep(char *buf, int buf_size, const char **pp, int sep)
69 const char *p, *p1;
70 int len;
71 p = *pp;
72 p1 = strchr(p, sep);
73 if (!p1)
74 return -1;
75 len = p1 - p;
76 p1++;
77 if (buf_size > 0) {
78 if (len > buf_size - 1)
79 len = buf_size - 1;
80 memcpy(buf, p, len);
81 buf[len] = '\0';
83 *pp = p1;
84 return 0;
87 int parse_host_port(struct sockaddr_in *saddr, const char *str,
88 Error **errp)
90 char buf[512];
91 struct hostent *he;
92 const char *p, *r;
93 int port;
95 p = str;
96 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
97 error_setg(errp, "host address '%s' doesn't contain ':' "
98 "separating host from port", str);
99 return -1;
101 saddr->sin_family = AF_INET;
102 if (buf[0] == '\0') {
103 saddr->sin_addr.s_addr = 0;
104 } else {
105 if (qemu_isdigit(buf[0])) {
106 if (!inet_aton(buf, &saddr->sin_addr)) {
107 error_setg(errp, "host address '%s' is not a valid "
108 "IPv4 address", buf);
109 return -1;
111 } else {
112 he = gethostbyname(buf);
113 if (he == NULL) {
114 error_setg(errp, "can't resolve host address '%s'", buf);
115 return - 1;
117 saddr->sin_addr = *(struct in_addr *)he->h_addr;
120 port = strtol(p, (char **)&r, 0);
121 if (r == p) {
122 error_setg(errp, "port number '%s' is invalid", p);
123 return -1;
125 saddr->sin_port = htons(port);
126 return 0;
129 char *qemu_mac_strdup_printf(const uint8_t *macaddr)
131 return g_strdup_printf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x",
132 macaddr[0], macaddr[1], macaddr[2],
133 macaddr[3], macaddr[4], macaddr[5]);
136 void qemu_format_nic_info_str(NetClientState *nc, uint8_t macaddr[6])
138 snprintf(nc->info_str, sizeof(nc->info_str),
139 "model=%s,macaddr=%02x:%02x:%02x:%02x:%02x:%02x",
140 nc->model,
141 macaddr[0], macaddr[1], macaddr[2],
142 macaddr[3], macaddr[4], macaddr[5]);
145 static int mac_table[256] = {0};
147 static void qemu_macaddr_set_used(MACAddr *macaddr)
149 int index;
151 for (index = 0x56; index < 0xFF; index++) {
152 if (macaddr->a[5] == index) {
153 mac_table[index]++;
158 static void qemu_macaddr_set_free(MACAddr *macaddr)
160 int index;
161 static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } };
163 if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) {
164 return;
166 for (index = 0x56; index < 0xFF; index++) {
167 if (macaddr->a[5] == index) {
168 mac_table[index]--;
173 static int qemu_macaddr_get_free(void)
175 int index;
177 for (index = 0x56; index < 0xFF; index++) {
178 if (mac_table[index] == 0) {
179 return index;
183 return -1;
186 void qemu_macaddr_default_if_unset(MACAddr *macaddr)
188 static const MACAddr zero = { .a = { 0,0,0,0,0,0 } };
189 static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } };
191 if (memcmp(macaddr, &zero, sizeof(zero)) != 0) {
192 if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) {
193 return;
194 } else {
195 qemu_macaddr_set_used(macaddr);
196 return;
200 macaddr->a[0] = 0x52;
201 macaddr->a[1] = 0x54;
202 macaddr->a[2] = 0x00;
203 macaddr->a[3] = 0x12;
204 macaddr->a[4] = 0x34;
205 macaddr->a[5] = qemu_macaddr_get_free();
206 qemu_macaddr_set_used(macaddr);
210 * Generate a name for net client
212 * Only net clients created with the legacy -net option and NICs need this.
214 static char *assign_name(NetClientState *nc1, const char *model)
216 NetClientState *nc;
217 int id = 0;
219 QTAILQ_FOREACH(nc, &net_clients, next) {
220 if (nc == nc1) {
221 continue;
223 if (strcmp(nc->model, model) == 0) {
224 id++;
228 return g_strdup_printf("%s.%d", model, id);
231 static void qemu_net_client_destructor(NetClientState *nc)
233 g_free(nc);
235 static ssize_t qemu_deliver_packet_iov(NetClientState *sender,
236 unsigned flags,
237 const struct iovec *iov,
238 int iovcnt,
239 void *opaque);
241 static void qemu_net_client_setup(NetClientState *nc,
242 NetClientInfo *info,
243 NetClientState *peer,
244 const char *model,
245 const char *name,
246 NetClientDestructor *destructor)
248 nc->info = info;
249 nc->model = g_strdup(model);
250 if (name) {
251 nc->name = g_strdup(name);
252 } else {
253 nc->name = assign_name(nc, model);
256 if (peer) {
257 assert(!peer->peer);
258 nc->peer = peer;
259 peer->peer = nc;
261 QTAILQ_INSERT_TAIL(&net_clients, nc, next);
263 nc->incoming_queue = qemu_new_net_queue(qemu_deliver_packet_iov, nc);
264 nc->destructor = destructor;
265 QTAILQ_INIT(&nc->filters);
268 NetClientState *qemu_new_net_client(NetClientInfo *info,
269 NetClientState *peer,
270 const char *model,
271 const char *name)
273 NetClientState *nc;
275 assert(info->size >= sizeof(NetClientState));
277 nc = g_malloc0(info->size);
278 qemu_net_client_setup(nc, info, peer, model, name,
279 qemu_net_client_destructor);
281 return nc;
284 NICState *qemu_new_nic(NetClientInfo *info,
285 NICConf *conf,
286 const char *model,
287 const char *name,
288 void *opaque)
290 NetClientState **peers = conf->peers.ncs;
291 NICState *nic;
292 int i, queues = MAX(1, conf->peers.queues);
294 assert(info->type == NET_CLIENT_DRIVER_NIC);
295 assert(info->size >= sizeof(NICState));
297 nic = g_malloc0(info->size + sizeof(NetClientState) * queues);
298 nic->ncs = (void *)nic + info->size;
299 nic->conf = conf;
300 nic->opaque = opaque;
302 for (i = 0; i < queues; i++) {
303 qemu_net_client_setup(&nic->ncs[i], info, peers[i], model, name,
304 NULL);
305 nic->ncs[i].queue_index = i;
308 return nic;
311 NetClientState *qemu_get_subqueue(NICState *nic, int queue_index)
313 return nic->ncs + queue_index;
316 NetClientState *qemu_get_queue(NICState *nic)
318 return qemu_get_subqueue(nic, 0);
321 NICState *qemu_get_nic(NetClientState *nc)
323 NetClientState *nc0 = nc - nc->queue_index;
325 return (NICState *)((void *)nc0 - nc->info->size);
328 void *qemu_get_nic_opaque(NetClientState *nc)
330 NICState *nic = qemu_get_nic(nc);
332 return nic->opaque;
335 static void qemu_cleanup_net_client(NetClientState *nc)
337 QTAILQ_REMOVE(&net_clients, nc, next);
339 if (nc->info->cleanup) {
340 nc->info->cleanup(nc);
344 static void qemu_free_net_client(NetClientState *nc)
346 if (nc->incoming_queue) {
347 qemu_del_net_queue(nc->incoming_queue);
349 if (nc->peer) {
350 nc->peer->peer = NULL;
352 g_free(nc->name);
353 g_free(nc->model);
354 if (nc->destructor) {
355 nc->destructor(nc);
359 void qemu_del_net_client(NetClientState *nc)
361 NetClientState *ncs[MAX_QUEUE_NUM];
362 int queues, i;
363 NetFilterState *nf, *next;
365 assert(nc->info->type != NET_CLIENT_DRIVER_NIC);
367 /* If the NetClientState belongs to a multiqueue backend, we will change all
368 * other NetClientStates also.
370 queues = qemu_find_net_clients_except(nc->name, ncs,
371 NET_CLIENT_DRIVER_NIC,
372 MAX_QUEUE_NUM);
373 assert(queues != 0);
375 QTAILQ_FOREACH_SAFE(nf, &nc->filters, next, next) {
376 object_unparent(OBJECT(nf));
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;
385 nic->peer_deleted = true;
387 for (i = 0; i < queues; i++) {
388 ncs[i]->peer->link_down = true;
391 if (nc->peer->info->link_status_changed) {
392 nc->peer->info->link_status_changed(nc->peer);
395 for (i = 0; i < queues; i++) {
396 qemu_cleanup_net_client(ncs[i]);
399 return;
402 for (i = 0; i < queues; i++) {
403 qemu_cleanup_net_client(ncs[i]);
404 qemu_free_net_client(ncs[i]);
408 void qemu_del_nic(NICState *nic)
410 int i, queues = MAX(nic->conf->peers.queues, 1);
412 qemu_macaddr_set_free(&nic->conf->macaddr);
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);
421 for (i = queues - 1; i >= 0; i--) {
422 NetClientState *nc = qemu_get_subqueue(nic, i);
424 qemu_cleanup_net_client(nc);
425 qemu_free_net_client(nc);
428 g_free(nic);
431 void qemu_foreach_nic(qemu_nic_foreach func, void *opaque)
433 NetClientState *nc;
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);
444 bool qemu_has_ufo(NetClientState *nc)
446 if (!nc || !nc->info->has_ufo) {
447 return false;
450 return nc->info->has_ufo(nc);
453 bool qemu_has_vnet_hdr(NetClientState *nc)
455 if (!nc || !nc->info->has_vnet_hdr) {
456 return false;
459 return nc->info->has_vnet_hdr(nc);
462 bool qemu_has_vnet_hdr_len(NetClientState *nc, int len)
464 if (!nc || !nc->info->has_vnet_hdr_len) {
465 return false;
468 return nc->info->has_vnet_hdr_len(nc, len);
471 void qemu_using_vnet_hdr(NetClientState *nc, bool enable)
473 if (!nc || !nc->info->using_vnet_hdr) {
474 return;
477 nc->info->using_vnet_hdr(nc, enable);
480 void qemu_set_offload(NetClientState *nc, int csum, int tso4, int tso6,
481 int ecn, int ufo)
483 if (!nc || !nc->info->set_offload) {
484 return;
487 nc->info->set_offload(nc, csum, tso4, tso6, ecn, ufo);
490 void qemu_set_vnet_hdr_len(NetClientState *nc, int len)
492 if (!nc || !nc->info->set_vnet_hdr_len) {
493 return;
496 nc->vnet_hdr_len = len;
497 nc->info->set_vnet_hdr_len(nc, len);
500 int qemu_set_vnet_le(NetClientState *nc, bool is_le)
502 #ifdef HOST_WORDS_BIGENDIAN
503 if (!nc || !nc->info->set_vnet_le) {
504 return -ENOSYS;
507 return nc->info->set_vnet_le(nc, is_le);
508 #else
509 return 0;
510 #endif
513 int qemu_set_vnet_be(NetClientState *nc, bool is_be)
515 #ifdef HOST_WORDS_BIGENDIAN
516 return 0;
517 #else
518 if (!nc || !nc->info->set_vnet_be) {
519 return -ENOSYS;
522 return nc->info->set_vnet_be(nc, is_be);
523 #endif
526 int qemu_can_send_packet(NetClientState *sender)
528 int vm_running = runstate_is_running();
530 if (!vm_running) {
531 return 0;
534 if (!sender->peer) {
535 return 1;
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;
544 return 1;
547 static 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)
555 ssize_t ret = 0;
556 NetFilterState *nf = NULL;
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;
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;
576 return ret;
579 static 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)
587 struct iovec iov = {
588 .iov_base = (void *)data,
589 .iov_len = size
592 return filter_receive_iov(nc, direction, sender, flags, &iov, 1, sent_cb);
595 void qemu_purge_queued_packets(NetClientState *nc)
597 if (!nc->peer) {
598 return;
601 qemu_net_queue_purge(nc->peer->incoming_queue, nc);
604 void qemu_flush_or_purge_queued_packets(NetClientState *nc, bool purge)
606 nc->receive_disabled = 0;
608 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_HUBPORT) {
609 if (net_hub_flush(nc->peer)) {
610 qemu_notify_event();
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).
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);
624 void qemu_flush_queued_packets(NetClientState *nc)
626 qemu_flush_or_purge_queued_packets(nc, false);
629 static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender,
630 unsigned flags,
631 const uint8_t *buf, int size,
632 NetPacketSent *sent_cb)
634 NetQueue *queue;
635 int ret;
637 #ifdef DEBUG_NET
638 printf("qemu_send_packet_async:\n");
639 qemu_hexdump((const char *)buf, stdout, "net", size);
640 #endif
642 if (sender->link_down || !sender->peer) {
643 return size;
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;
653 ret = filter_receive(sender->peer, NET_FILTER_DIRECTION_RX,
654 sender, flags, buf, size, sent_cb);
655 if (ret) {
656 return ret;
659 queue = sender->peer->incoming_queue;
661 return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb);
664 ssize_t qemu_send_packet_async(NetClientState *sender,
665 const uint8_t *buf, int size,
666 NetPacketSent *sent_cb)
668 return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE,
669 buf, size, sent_cb);
672 ssize_t qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size)
674 return qemu_send_packet_async(nc, buf, size, NULL);
677 ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size)
679 return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW,
680 buf, size, NULL);
683 static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov,
684 int iovcnt, unsigned flags)
686 uint8_t *buf = NULL;
687 uint8_t *buffer;
688 size_t offset;
689 ssize_t ret;
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;
699 buf = g_malloc(offset);
700 buffer = buf;
701 offset = iov_to_buf(iov, iovcnt, 0, buf, offset);
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);
710 g_free(buf);
711 return ret;
714 static ssize_t qemu_deliver_packet_iov(NetClientState *sender,
715 unsigned flags,
716 const struct iovec *iov,
717 int iovcnt,
718 void *opaque)
720 NetClientState *nc = opaque;
721 int ret;
724 if (nc->link_down) {
725 return iov_size(iov, iovcnt);
728 if (nc->receive_disabled) {
729 return 0;
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);
738 if (ret == 0) {
739 nc->receive_disabled = 1;
742 return ret;
745 ssize_t qemu_sendv_packet_async(NetClientState *sender,
746 const struct iovec *iov, int iovcnt,
747 NetPacketSent *sent_cb)
749 NetQueue *queue;
750 size_t size = iov_size(iov, iovcnt);
751 int ret;
753 if (size > NET_BUFSIZE) {
754 return size;
757 if (sender->link_down || !sender->peer) {
758 return size;
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;
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;
774 queue = sender->peer->incoming_queue;
776 return qemu_net_queue_send_iov(queue, sender,
777 QEMU_NET_PACKET_FLAG_NONE,
778 iov, iovcnt, sent_cb);
781 ssize_t
782 qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt)
784 return qemu_sendv_packet_async(nc, iov, iovcnt, NULL);
787 NetClientState *qemu_find_netdev(const char *id)
789 NetClientState *nc;
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;
799 return NULL;
802 int qemu_find_net_clients_except(const char *id, NetClientState **ncs,
803 NetClientDriver type, int max)
805 NetClientState *nc;
806 int ret = 0;
808 QTAILQ_FOREACH(nc, &net_clients, next) {
809 if (nc->info->type == type) {
810 continue;
812 if (!id || !strcmp(nc->name, id)) {
813 if (ret < max) {
814 ncs[ret] = nc;
816 ret++;
820 return ret;
823 static int nic_get_free_idx(void)
825 int index;
827 for (index = 0; index < MAX_NICS; index++)
828 if (!nd_table[index].used)
829 return index;
830 return -1;
833 int qemu_show_nic_models(const char *arg, const char *const *models)
835 int i;
837 if (!arg || !is_help_option(arg)) {
838 return 0;
841 printf("Supported NIC models:\n");
842 for (i = 0 ; models[i]; i++) {
843 printf("%s\n", models[i]);
845 return 1;
848 void qemu_check_nic_model(NICInfo *nd, const char *model)
850 const char *models[2];
852 models[0] = model;
853 models[1] = NULL;
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);
861 int qemu_find_nic_model(NICInfo *nd, const char * const *models,
862 const char *default_model)
864 int i;
866 if (!nd->model)
867 nd->model = g_strdup(default_model);
869 for (i = 0 ; models[i]; i++) {
870 if (strcmp(nd->model, models[i]) == 0)
871 return i;
874 error_report("Unsupported NIC model: %s", nd->model);
875 return -1;
878 static int net_init_nic(const Netdev *netdev, const char *name,
879 NetClientState *peer, Error **errp)
881 int idx;
882 NICInfo *nd;
883 const NetLegacyNicOptions *nic;
885 assert(netdev->type == NET_CLIENT_DRIVER_NIC);
886 nic = &netdev->u.nic;
888 idx = nic_get_free_idx();
889 if (idx == -1 || nb_nics >= MAX_NICS) {
890 error_setg(errp, "too many NICs");
891 return -1;
894 nd = &nd_table[idx];
896 memset(nd, 0, sizeof(*nd));
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;
904 } else {
905 assert(peer);
906 nd->netdev = peer;
908 nd->name = g_strdup(name);
909 if (nic->has_model) {
910 nd->model = g_strdup(nic->model);
912 if (nic->has_addr) {
913 nd->devaddr = g_strdup(nic->addr);
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;
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;
927 qemu_macaddr_default_if_unset(&nd->macaddr);
929 if (nic->has_vectors) {
930 if (nic->vectors > 0x7ffffff) {
931 error_setg(errp, "invalid # of vectors: %"PRIu32, nic->vectors);
932 return -1;
934 nd->nvectors = nic->vectors;
935 } else {
936 nd->nvectors = DEV_NVECTORS_UNSPECIFIED;
939 nd->used = 1;
940 nb_nics++;
942 return idx;
946 static 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_L2TPV3
970 [NET_CLIENT_DRIVER_L2TPV3] = net_init_l2tpv3,
971 #endif
975 static int net_client_init1(const void *object, bool is_netdev, Error **errp)
977 Netdev legacy = {0};
978 const Netdev *netdev;
979 const char *name;
980 NetClientState *peer = NULL;
982 if (is_netdev) {
983 netdev = object;
984 name = netdev->id;
986 if (netdev->type == NET_CLIENT_DRIVER_NIC ||
987 !net_client_init_fun[netdev->type]) {
988 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
989 "a netdev backend type");
990 return -1;
992 } else {
993 const NetLegacy *net = object;
994 const NetLegacyOptions *opts = net->opts;
995 legacy.id = net->id;
996 netdev = &legacy;
997 /* missing optional values have been initialized to "all bits zero" */
998 name = net->has_id ? net->id : net->name;
1000 if (net->has_name) {
1001 warn_report("The 'name' parameter is deprecated, use 'id' instead");
1004 /* Map the old options to the new flat type */
1005 switch (opts->type) {
1006 case NET_LEGACY_OPTIONS_TYPE_NONE:
1007 return 0; /* nothing to do */
1008 case NET_LEGACY_OPTIONS_TYPE_NIC:
1009 legacy.type = NET_CLIENT_DRIVER_NIC;
1010 legacy.u.nic = opts->u.nic;
1011 break;
1012 case NET_LEGACY_OPTIONS_TYPE_USER:
1013 legacy.type = NET_CLIENT_DRIVER_USER;
1014 legacy.u.user = opts->u.user;
1015 break;
1016 case NET_LEGACY_OPTIONS_TYPE_TAP:
1017 legacy.type = NET_CLIENT_DRIVER_TAP;
1018 legacy.u.tap = opts->u.tap;
1019 break;
1020 case NET_LEGACY_OPTIONS_TYPE_L2TPV3:
1021 legacy.type = NET_CLIENT_DRIVER_L2TPV3;
1022 legacy.u.l2tpv3 = opts->u.l2tpv3;
1023 break;
1024 case NET_LEGACY_OPTIONS_TYPE_SOCKET:
1025 legacy.type = NET_CLIENT_DRIVER_SOCKET;
1026 legacy.u.socket = opts->u.socket;
1027 break;
1028 case NET_LEGACY_OPTIONS_TYPE_VDE:
1029 legacy.type = NET_CLIENT_DRIVER_VDE;
1030 legacy.u.vde = opts->u.vde;
1031 break;
1032 case NET_LEGACY_OPTIONS_TYPE_BRIDGE:
1033 legacy.type = NET_CLIENT_DRIVER_BRIDGE;
1034 legacy.u.bridge = opts->u.bridge;
1035 break;
1036 case NET_LEGACY_OPTIONS_TYPE_NETMAP:
1037 legacy.type = NET_CLIENT_DRIVER_NETMAP;
1038 legacy.u.netmap = opts->u.netmap;
1039 break;
1040 case NET_LEGACY_OPTIONS_TYPE_VHOST_USER:
1041 legacy.type = NET_CLIENT_DRIVER_VHOST_USER;
1042 legacy.u.vhost_user = opts->u.vhost_user;
1043 break;
1044 default:
1045 abort();
1048 if (!net_client_init_fun[netdev->type]) {
1049 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
1050 "a net backend type (maybe it is not compiled "
1051 "into this binary)");
1052 return -1;
1055 /* Do not add to a hub if it's a nic with a netdev= parameter. */
1056 if (netdev->type != NET_CLIENT_DRIVER_NIC ||
1057 !opts->u.nic.has_netdev) {
1058 peer = net_hub_add_port(0, NULL, NULL);
1062 if (net_client_init_fun[netdev->type](netdev, name, peer, errp) < 0) {
1063 /* FIXME drop when all init functions store an Error */
1064 if (errp && !*errp) {
1065 error_setg(errp, QERR_DEVICE_INIT_FAILED,
1066 NetClientDriver_str(netdev->type));
1068 return -1;
1070 return 0;
1073 static void show_netdevs(void)
1075 int idx;
1076 const char *available_netdevs[] = {
1077 "socket",
1078 "hubport",
1079 "tap",
1080 #ifdef CONFIG_SLIRP
1081 "user",
1082 #endif
1083 #ifdef CONFIG_L2TPV3
1084 "l2tpv3",
1085 #endif
1086 #ifdef CONFIG_VDE
1087 "vde",
1088 #endif
1089 #ifdef CONFIG_NET_BRIDGE
1090 "bridge",
1091 #endif
1092 #ifdef CONFIG_NETMAP
1093 "netmap",
1094 #endif
1095 #ifdef CONFIG_POSIX
1096 "vhost-user",
1097 #endif
1100 printf("Available netdev backend types:\n");
1101 for (idx = 0; idx < ARRAY_SIZE(available_netdevs); idx++) {
1102 puts(available_netdevs[idx]);
1106 static int net_client_init(QemuOpts *opts, bool is_netdev, Error **errp)
1108 void *object = NULL;
1109 Error *err = NULL;
1110 int ret = -1;
1111 Visitor *v = opts_visitor_new(opts);
1113 const char *type = qemu_opt_get(opts, "type");
1115 if (is_netdev && type && is_help_option(type)) {
1116 show_netdevs();
1117 exit(0);
1118 } else {
1119 /* Parse convenience option format ip6-net=fec0::0[/64] */
1120 const char *ip6_net = qemu_opt_get(opts, "ipv6-net");
1122 if (ip6_net) {
1123 char buf[strlen(ip6_net) + 1];
1125 if (get_str_sep(buf, sizeof(buf), &ip6_net, '/') < 0) {
1126 /* Default 64bit prefix length. */
1127 qemu_opt_set(opts, "ipv6-prefix", ip6_net, &error_abort);
1128 qemu_opt_set_number(opts, "ipv6-prefixlen", 64, &error_abort);
1129 } else {
1130 /* User-specified prefix length. */
1131 unsigned long len;
1132 int err;
1134 qemu_opt_set(opts, "ipv6-prefix", buf, &error_abort);
1135 err = qemu_strtoul(ip6_net, NULL, 10, &len);
1137 if (err) {
1138 error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1139 "ipv6-prefix", "a number");
1140 } else {
1141 qemu_opt_set_number(opts, "ipv6-prefixlen", len,
1142 &error_abort);
1145 qemu_opt_unset(opts, "ipv6-net");
1149 if (is_netdev) {
1150 visit_type_Netdev(v, NULL, (Netdev **)&object, &err);
1151 } else {
1152 visit_type_NetLegacy(v, NULL, (NetLegacy **)&object, &err);
1155 if (!err) {
1156 ret = net_client_init1(object, is_netdev, &err);
1159 if (is_netdev) {
1160 qapi_free_Netdev(object);
1161 } else {
1162 qapi_free_NetLegacy(object);
1165 error_propagate(errp, err);
1166 visit_free(v);
1167 return ret;
1170 void netdev_add(QemuOpts *opts, Error **errp)
1172 net_client_init(opts, true, errp);
1175 void qmp_netdev_add(QDict *qdict, QObject **ret, Error **errp)
1177 Error *local_err = NULL;
1178 QemuOptsList *opts_list;
1179 QemuOpts *opts;
1181 opts_list = qemu_find_opts_err("netdev", &local_err);
1182 if (local_err) {
1183 goto out;
1186 opts = qemu_opts_from_qdict(opts_list, qdict, &local_err);
1187 if (local_err) {
1188 goto out;
1191 netdev_add(opts, &local_err);
1192 if (local_err) {
1193 qemu_opts_del(opts);
1194 goto out;
1197 out:
1198 error_propagate(errp, local_err);
1201 void qmp_netdev_del(const char *id, Error **errp)
1203 NetClientState *nc;
1204 QemuOpts *opts;
1206 nc = qemu_find_netdev(id);
1207 if (!nc) {
1208 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1209 "Device '%s' not found", id);
1210 return;
1213 opts = qemu_opts_find(qemu_find_opts_err("netdev", NULL), id);
1214 if (!opts) {
1215 error_setg(errp, "Device '%s' is not a netdev", id);
1216 return;
1219 qemu_del_net_client(nc);
1220 qemu_opts_del(opts);
1223 static void netfilter_print_info(Monitor *mon, NetFilterState *nf)
1225 char *str;
1226 ObjectProperty *prop;
1227 ObjectPropertyIterator iter;
1228 Visitor *v;
1230 /* generate info str */
1231 object_property_iter_init(&iter, OBJECT(nf));
1232 while ((prop = object_property_iter_next(&iter))) {
1233 if (!strcmp(prop->name, "type")) {
1234 continue;
1236 v = string_output_visitor_new(false, &str);
1237 object_property_get(OBJECT(nf), v, prop->name, NULL);
1238 visit_complete(v, &str);
1239 visit_free(v);
1240 monitor_printf(mon, ",%s=%s", prop->name, str);
1241 g_free(str);
1243 monitor_printf(mon, "\n");
1246 void print_net_client(Monitor *mon, NetClientState *nc)
1248 NetFilterState *nf;
1250 monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name,
1251 nc->queue_index,
1252 NetClientDriver_str(nc->info->type),
1253 nc->info_str);
1254 if (!QTAILQ_EMPTY(&nc->filters)) {
1255 monitor_printf(mon, "filters:\n");
1257 QTAILQ_FOREACH(nf, &nc->filters, next) {
1258 char *path = object_get_canonical_path_component(OBJECT(nf));
1260 monitor_printf(mon, " - %s: type=%s", path,
1261 object_get_typename(OBJECT(nf)));
1262 netfilter_print_info(mon, nf);
1263 g_free(path);
1267 RxFilterInfoList *qmp_query_rx_filter(bool has_name, const char *name,
1268 Error **errp)
1270 NetClientState *nc;
1271 RxFilterInfoList *filter_list = NULL, *last_entry = NULL;
1273 QTAILQ_FOREACH(nc, &net_clients, next) {
1274 RxFilterInfoList *entry;
1275 RxFilterInfo *info;
1277 if (has_name && strcmp(nc->name, name) != 0) {
1278 continue;
1281 /* only query rx-filter information of NIC */
1282 if (nc->info->type != NET_CLIENT_DRIVER_NIC) {
1283 if (has_name) {
1284 error_setg(errp, "net client(%s) isn't a NIC", name);
1285 return NULL;
1287 continue;
1290 /* only query information on queue 0 since the info is per nic,
1291 * not per queue
1293 if (nc->queue_index != 0)
1294 continue;
1296 if (nc->info->query_rx_filter) {
1297 info = nc->info->query_rx_filter(nc);
1298 entry = g_malloc0(sizeof(*entry));
1299 entry->value = info;
1301 if (!filter_list) {
1302 filter_list = entry;
1303 } else {
1304 last_entry->next = entry;
1306 last_entry = entry;
1307 } else if (has_name) {
1308 error_setg(errp, "net client(%s) doesn't support"
1309 " rx-filter querying", name);
1310 return NULL;
1313 if (has_name) {
1314 break;
1318 if (filter_list == NULL && has_name) {
1319 error_setg(errp, "invalid net client name: %s", name);
1322 return filter_list;
1325 void hmp_info_network(Monitor *mon, const QDict *qdict)
1327 NetClientState *nc, *peer;
1328 NetClientDriver type;
1330 net_hub_info(mon);
1332 QTAILQ_FOREACH(nc, &net_clients, next) {
1333 peer = nc->peer;
1334 type = nc->info->type;
1336 /* Skip if already printed in hub info */
1337 if (net_hub_id_for_client(nc, NULL) == 0) {
1338 continue;
1341 if (!peer || type == NET_CLIENT_DRIVER_NIC) {
1342 print_net_client(mon, nc);
1343 } /* else it's a netdev connected to a NIC, printed with the NIC */
1344 if (peer && type == NET_CLIENT_DRIVER_NIC) {
1345 monitor_printf(mon, " \\ ");
1346 print_net_client(mon, peer);
1351 void colo_notify_filters_event(int event, Error **errp)
1353 NetClientState *nc;
1354 NetFilterState *nf;
1355 NetFilterClass *nfc = NULL;
1356 Error *local_err = NULL;
1358 QTAILQ_FOREACH(nc, &net_clients, next) {
1359 QTAILQ_FOREACH(nf, &nc->filters, next) {
1360 nfc = NETFILTER_GET_CLASS(OBJECT(nf));
1361 nfc->handle_event(nf, event, &local_err);
1362 if (local_err) {
1363 error_propagate(errp, local_err);
1364 return;
1370 void qmp_set_link(const char *name, bool up, Error **errp)
1372 NetClientState *ncs[MAX_QUEUE_NUM];
1373 NetClientState *nc;
1374 int queues, i;
1376 queues = qemu_find_net_clients_except(name, ncs,
1377 NET_CLIENT_DRIVER__MAX,
1378 MAX_QUEUE_NUM);
1380 if (queues == 0) {
1381 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1382 "Device '%s' not found", name);
1383 return;
1385 nc = ncs[0];
1387 for (i = 0; i < queues; i++) {
1388 ncs[i]->link_down = !up;
1391 if (nc->info->link_status_changed) {
1392 nc->info->link_status_changed(nc);
1395 if (nc->peer) {
1396 /* Change peer link only if the peer is NIC and then notify peer.
1397 * If the peer is a HUBPORT or a backend, we do not change the
1398 * link status.
1400 * This behavior is compatible with qemu hubs where there could be
1401 * multiple clients that can still communicate with each other in
1402 * disconnected mode. For now maintain this compatibility.
1404 if (nc->peer->info->type == NET_CLIENT_DRIVER_NIC) {
1405 for (i = 0; i < queues; i++) {
1406 ncs[i]->peer->link_down = !up;
1409 if (nc->peer->info->link_status_changed) {
1410 nc->peer->info->link_status_changed(nc->peer);
1415 static void net_vm_change_state_handler(void *opaque, int running,
1416 RunState state)
1418 NetClientState *nc;
1419 NetClientState *tmp;
1421 QTAILQ_FOREACH_SAFE(nc, &net_clients, next, tmp) {
1422 if (running) {
1423 /* Flush queued packets and wake up backends. */
1424 if (nc->peer && qemu_can_send_packet(nc)) {
1425 qemu_flush_queued_packets(nc->peer);
1427 } else {
1428 /* Complete all queued packets, to guarantee we don't modify
1429 * state later when VM is not running.
1431 qemu_flush_or_purge_queued_packets(nc, true);
1436 void net_cleanup(void)
1438 NetClientState *nc;
1440 /* We may del multiple entries during qemu_del_net_client(),
1441 * so QTAILQ_FOREACH_SAFE() is also not safe here.
1443 while (!QTAILQ_EMPTY(&net_clients)) {
1444 nc = QTAILQ_FIRST(&net_clients);
1445 if (nc->info->type == NET_CLIENT_DRIVER_NIC) {
1446 qemu_del_nic(qemu_get_nic(nc));
1447 } else {
1448 qemu_del_net_client(nc);
1452 qemu_del_vm_change_state_handler(net_change_state_entry);
1455 void net_check_clients(void)
1457 NetClientState *nc;
1458 int i;
1460 net_hub_check_clients();
1462 QTAILQ_FOREACH(nc, &net_clients, next) {
1463 if (!nc->peer) {
1464 warn_report("%s %s has no peer",
1465 nc->info->type == NET_CLIENT_DRIVER_NIC
1466 ? "nic" : "netdev",
1467 nc->name);
1471 /* Check that all NICs requested via -net nic actually got created.
1472 * NICs created via -device don't need to be checked here because
1473 * they are always instantiated.
1475 for (i = 0; i < MAX_NICS; i++) {
1476 NICInfo *nd = &nd_table[i];
1477 if (nd->used && !nd->instantiated) {
1478 warn_report("requested NIC (%s, model %s) "
1479 "was not created (not supported by this machine?)",
1480 nd->name ? nd->name : "anonymous",
1481 nd->model ? nd->model : "unspecified");
1486 static int net_init_client(void *dummy, QemuOpts *opts, Error **errp)
1488 return net_client_init(opts, false, errp);
1491 static int net_init_netdev(void *dummy, QemuOpts *opts, Error **errp)
1493 return net_client_init(opts, true, errp);
1496 /* For the convenience "--nic" parameter */
1497 static int net_param_nic(void *dummy, QemuOpts *opts, Error **errp)
1499 char *mac, *nd_id;
1500 int idx, ret;
1501 NICInfo *ni;
1502 const char *type;
1504 type = qemu_opt_get(opts, "type");
1505 if (type && g_str_equal(type, "none")) {
1506 return 0; /* Nothing to do, default_net is cleared in vl.c */
1509 idx = nic_get_free_idx();
1510 if (idx == -1 || nb_nics >= MAX_NICS) {
1511 error_setg(errp, "no more on-board/default NIC slots available");
1512 return -1;
1515 if (!type) {
1516 qemu_opt_set(opts, "type", "user", &error_abort);
1519 ni = &nd_table[idx];
1520 memset(ni, 0, sizeof(*ni));
1521 ni->model = qemu_opt_get_del(opts, "model");
1523 /* Create an ID if the user did not specify one */
1524 nd_id = g_strdup(qemu_opts_id(opts));
1525 if (!nd_id) {
1526 nd_id = g_strdup_printf("__org.qemu.nic%i\n", idx);
1527 qemu_opts_set_id(opts, nd_id);
1530 /* Handle MAC address */
1531 mac = qemu_opt_get_del(opts, "mac");
1532 if (mac) {
1533 ret = net_parse_macaddr(ni->macaddr.a, mac);
1534 g_free(mac);
1535 if (ret) {
1536 error_setg(errp, "invalid syntax for ethernet address");
1537 goto out;
1539 if (is_multicast_ether_addr(ni->macaddr.a)) {
1540 error_setg(errp, "NIC cannot have multicast MAC address");
1541 ret = -1;
1542 goto out;
1545 qemu_macaddr_default_if_unset(&ni->macaddr);
1547 ret = net_client_init(opts, true, errp);
1548 if (ret == 0) {
1549 ni->netdev = qemu_find_netdev(nd_id);
1550 ni->used = true;
1551 nb_nics++;
1554 out:
1555 g_free(nd_id);
1556 return ret;
1559 int net_init_clients(Error **errp)
1561 net_change_state_entry =
1562 qemu_add_vm_change_state_handler(net_vm_change_state_handler, NULL);
1564 QTAILQ_INIT(&net_clients);
1566 if (qemu_opts_foreach(qemu_find_opts("netdev"),
1567 net_init_netdev, NULL, errp)) {
1568 return -1;
1571 if (qemu_opts_foreach(qemu_find_opts("nic"), net_param_nic, NULL, errp)) {
1572 return -1;
1575 if (qemu_opts_foreach(qemu_find_opts("net"), net_init_client, NULL, errp)) {
1576 return -1;
1579 return 0;
1582 int net_client_parse(QemuOptsList *opts_list, const char *optarg)
1584 if (!qemu_opts_parse_noisily(opts_list, optarg, true)) {
1585 return -1;
1588 return 0;
1591 /* From FreeBSD */
1592 /* XXX: optimize */
1593 uint32_t net_crc32(const uint8_t *p, int len)
1595 uint32_t crc;
1596 int carry, i, j;
1597 uint8_t b;
1599 crc = 0xffffffff;
1600 for (i = 0; i < len; i++) {
1601 b = *p++;
1602 for (j = 0; j < 8; j++) {
1603 carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01);
1604 crc <<= 1;
1605 b >>= 1;
1606 if (carry) {
1607 crc = ((crc ^ POLYNOMIAL_BE) | carry);
1612 return crc;
1615 uint32_t net_crc32_le(const uint8_t *p, int len)
1617 uint32_t crc;
1618 int carry, i, j;
1619 uint8_t b;
1621 crc = 0xffffffff;
1622 for (i = 0; i < len; i++) {
1623 b = *p++;
1624 for (j = 0; j < 8; j++) {
1625 carry = (crc & 0x1) ^ (b & 0x01);
1626 crc >>= 1;
1627 b >>= 1;
1628 if (carry) {
1629 crc ^= POLYNOMIAL_LE;
1634 return crc;
1637 QemuOptsList qemu_netdev_opts = {
1638 .name = "netdev",
1639 .implied_opt_name = "type",
1640 .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head),
1641 .desc = {
1643 * no elements => accept any params
1644 * validation will happen later
1646 { /* end of list */ }
1650 QemuOptsList qemu_nic_opts = {
1651 .name = "nic",
1652 .implied_opt_name = "type",
1653 .head = QTAILQ_HEAD_INITIALIZER(qemu_nic_opts.head),
1654 .desc = {
1656 * no elements => accept any params
1657 * validation will happen later
1659 { /* end of list */ }
1663 QemuOptsList qemu_net_opts = {
1664 .name = "net",
1665 .implied_opt_name = "type",
1666 .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head),
1667 .desc = {
1669 * no elements => accept any params
1670 * validation will happen later
1672 { /* end of list */ }
1676 void net_socket_rs_init(SocketReadState *rs,
1677 SocketReadStateFinalize *finalize,
1678 bool vnet_hdr)
1680 rs->state = 0;
1681 rs->vnet_hdr = vnet_hdr;
1682 rs->index = 0;
1683 rs->packet_len = 0;
1684 rs->vnet_hdr_len = 0;
1685 memset(rs->buf, 0, sizeof(rs->buf));
1686 rs->finalize = finalize;
1690 * Returns
1691 * 0: success
1692 * -1: error occurs
1694 int net_fill_rstate(SocketReadState *rs, const uint8_t *buf, int size)
1696 unsigned int l;
1698 while (size > 0) {
1699 /* Reassemble a packet from the network.
1700 * 0 = getting length.
1701 * 1 = getting vnet header length.
1702 * 2 = getting data.
1704 switch (rs->state) {
1705 case 0:
1706 l = 4 - rs->index;
1707 if (l > size) {
1708 l = size;
1710 memcpy(rs->buf + rs->index, buf, l);
1711 buf += l;
1712 size -= l;
1713 rs->index += l;
1714 if (rs->index == 4) {
1715 /* got length */
1716 rs->packet_len = ntohl(*(uint32_t *)rs->buf);
1717 rs->index = 0;
1718 if (rs->vnet_hdr) {
1719 rs->state = 1;
1720 } else {
1721 rs->state = 2;
1722 rs->vnet_hdr_len = 0;
1725 break;
1726 case 1:
1727 l = 4 - rs->index;
1728 if (l > size) {
1729 l = size;
1731 memcpy(rs->buf + rs->index, buf, l);
1732 buf += l;
1733 size -= l;
1734 rs->index += l;
1735 if (rs->index == 4) {
1736 /* got vnet header length */
1737 rs->vnet_hdr_len = ntohl(*(uint32_t *)rs->buf);
1738 rs->index = 0;
1739 rs->state = 2;
1741 break;
1742 case 2:
1743 l = rs->packet_len - rs->index;
1744 if (l > size) {
1745 l = size;
1747 if (rs->index + l <= sizeof(rs->buf)) {
1748 memcpy(rs->buf + rs->index, buf, l);
1749 } else {
1750 fprintf(stderr, "serious error: oversized packet received,"
1751 "connection terminated.\n");
1752 rs->index = rs->state = 0;
1753 return -1;
1756 rs->index += l;
1757 buf += l;
1758 size -= l;
1759 if (rs->index >= rs->packet_len) {
1760 rs->index = 0;
1761 rs->state = 0;
1762 assert(rs->finalize);
1763 rs->finalize(rs);
1765 break;
1769 assert(size == 0);
1770 return 0;