target/ppc: Use proper logging function for possible guest errors
[qemu.git] / net / net.c
blobefb9eaf7798bcea09e6aee29c750ae7e2b14d963
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 "hw/qdev.h"
45 #include "qemu/iov.h"
46 #include "qemu/main-loop.h"
47 #include "qemu/option.h"
48 #include "qapi/error.h"
49 #include "qapi/opts-visitor.h"
50 #include "sysemu/sysemu.h"
51 #include "sysemu/qtest.h"
52 #include "net/filter.h"
53 #include "qapi/string-output-visitor.h"
55 /* Net bridge is currently not supported for W32. */
56 #if !defined(_WIN32)
57 # define CONFIG_NET_BRIDGE
58 #endif
60 static VMChangeStateEntry *net_change_state_entry;
61 static QTAILQ_HEAD(, NetClientState) net_clients;
63 /***********************************************************/
64 /* network device redirectors */
66 static int get_str_sep(char *buf, int buf_size, const char **pp, int sep)
68 const char *p, *p1;
69 int len;
70 p = *pp;
71 p1 = strchr(p, sep);
72 if (!p1)
73 return -1;
74 len = p1 - p;
75 p1++;
76 if (buf_size > 0) {
77 if (len > buf_size - 1)
78 len = buf_size - 1;
79 memcpy(buf, p, len);
80 buf[len] = '\0';
82 *pp = p1;
83 return 0;
86 int parse_host_port(struct sockaddr_in *saddr, const char *str,
87 Error **errp)
89 char buf[512];
90 struct hostent *he;
91 const char *p, *r;
92 int port;
94 p = str;
95 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
96 error_setg(errp, "host address '%s' doesn't contain ':' "
97 "separating host from port", str);
98 return -1;
100 saddr->sin_family = AF_INET;
101 if (buf[0] == '\0') {
102 saddr->sin_addr.s_addr = 0;
103 } else {
104 if (qemu_isdigit(buf[0])) {
105 if (!inet_aton(buf, &saddr->sin_addr)) {
106 error_setg(errp, "host address '%s' is not a valid "
107 "IPv4 address", buf);
108 return -1;
110 } else {
111 he = gethostbyname(buf);
112 if (he == NULL) {
113 error_setg(errp, "can't resolve host address '%s'", buf);
114 return - 1;
116 saddr->sin_addr = *(struct in_addr *)he->h_addr;
119 port = strtol(p, (char **)&r, 0);
120 if (r == p) {
121 error_setg(errp, "port number '%s' is invalid", p);
122 return -1;
124 saddr->sin_port = htons(port);
125 return 0;
128 char *qemu_mac_strdup_printf(const uint8_t *macaddr)
130 return g_strdup_printf("%.2x:%.2x:%.2x:%.2x:%.2x:%.2x",
131 macaddr[0], macaddr[1], macaddr[2],
132 macaddr[3], macaddr[4], macaddr[5]);
135 void qemu_format_nic_info_str(NetClientState *nc, uint8_t macaddr[6])
137 snprintf(nc->info_str, sizeof(nc->info_str),
138 "model=%s,macaddr=%02x:%02x:%02x:%02x:%02x:%02x",
139 nc->model,
140 macaddr[0], macaddr[1], macaddr[2],
141 macaddr[3], macaddr[4], macaddr[5]);
144 static int mac_table[256] = {0};
146 static void qemu_macaddr_set_used(MACAddr *macaddr)
148 int index;
150 for (index = 0x56; index < 0xFF; index++) {
151 if (macaddr->a[5] == index) {
152 mac_table[index]++;
157 static void qemu_macaddr_set_free(MACAddr *macaddr)
159 int index;
160 static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } };
162 if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) {
163 return;
165 for (index = 0x56; index < 0xFF; index++) {
166 if (macaddr->a[5] == index) {
167 mac_table[index]--;
172 static int qemu_macaddr_get_free(void)
174 int index;
176 for (index = 0x56; index < 0xFF; index++) {
177 if (mac_table[index] == 0) {
178 return index;
182 return -1;
185 void qemu_macaddr_default_if_unset(MACAddr *macaddr)
187 static const MACAddr zero = { .a = { 0,0,0,0,0,0 } };
188 static const MACAddr base = { .a = { 0x52, 0x54, 0x00, 0x12, 0x34, 0 } };
190 if (memcmp(macaddr, &zero, sizeof(zero)) != 0) {
191 if (memcmp(macaddr->a, &base.a, (sizeof(base.a) - 1)) != 0) {
192 return;
193 } else {
194 qemu_macaddr_set_used(macaddr);
195 return;
199 macaddr->a[0] = 0x52;
200 macaddr->a[1] = 0x54;
201 macaddr->a[2] = 0x00;
202 macaddr->a[3] = 0x12;
203 macaddr->a[4] = 0x34;
204 macaddr->a[5] = qemu_macaddr_get_free();
205 qemu_macaddr_set_used(macaddr);
209 * Generate a name for net client
211 * Only net clients created with the legacy -net option and NICs need this.
213 static char *assign_name(NetClientState *nc1, const char *model)
215 NetClientState *nc;
216 int id = 0;
218 QTAILQ_FOREACH(nc, &net_clients, next) {
219 if (nc == nc1) {
220 continue;
222 if (strcmp(nc->model, model) == 0) {
223 id++;
227 return g_strdup_printf("%s.%d", model, id);
230 static void qemu_net_client_destructor(NetClientState *nc)
232 g_free(nc);
235 static void qemu_net_client_setup(NetClientState *nc,
236 NetClientInfo *info,
237 NetClientState *peer,
238 const char *model,
239 const char *name,
240 NetClientDestructor *destructor)
242 nc->info = info;
243 nc->model = g_strdup(model);
244 if (name) {
245 nc->name = g_strdup(name);
246 } else {
247 nc->name = assign_name(nc, model);
250 if (peer) {
251 assert(!peer->peer);
252 nc->peer = peer;
253 peer->peer = nc;
255 QTAILQ_INSERT_TAIL(&net_clients, nc, next);
257 nc->incoming_queue = qemu_new_net_queue(qemu_deliver_packet_iov, nc);
258 nc->destructor = destructor;
259 QTAILQ_INIT(&nc->filters);
262 NetClientState *qemu_new_net_client(NetClientInfo *info,
263 NetClientState *peer,
264 const char *model,
265 const char *name)
267 NetClientState *nc;
269 assert(info->size >= sizeof(NetClientState));
271 nc = g_malloc0(info->size);
272 qemu_net_client_setup(nc, info, peer, model, name,
273 qemu_net_client_destructor);
275 return nc;
278 NICState *qemu_new_nic(NetClientInfo *info,
279 NICConf *conf,
280 const char *model,
281 const char *name,
282 void *opaque)
284 NetClientState **peers = conf->peers.ncs;
285 NICState *nic;
286 int i, queues = MAX(1, conf->peers.queues);
288 assert(info->type == NET_CLIENT_DRIVER_NIC);
289 assert(info->size >= sizeof(NICState));
291 nic = g_malloc0(info->size + sizeof(NetClientState) * queues);
292 nic->ncs = (void *)nic + info->size;
293 nic->conf = conf;
294 nic->opaque = opaque;
296 for (i = 0; i < queues; i++) {
297 qemu_net_client_setup(&nic->ncs[i], info, peers[i], model, name,
298 NULL);
299 nic->ncs[i].queue_index = i;
302 return nic;
305 NetClientState *qemu_get_subqueue(NICState *nic, int queue_index)
307 return nic->ncs + queue_index;
310 NetClientState *qemu_get_queue(NICState *nic)
312 return qemu_get_subqueue(nic, 0);
315 NICState *qemu_get_nic(NetClientState *nc)
317 NetClientState *nc0 = nc - nc->queue_index;
319 return (NICState *)((void *)nc0 - nc->info->size);
322 void *qemu_get_nic_opaque(NetClientState *nc)
324 NICState *nic = qemu_get_nic(nc);
326 return nic->opaque;
329 static void qemu_cleanup_net_client(NetClientState *nc)
331 QTAILQ_REMOVE(&net_clients, nc, next);
333 if (nc->info->cleanup) {
334 nc->info->cleanup(nc);
338 static void qemu_free_net_client(NetClientState *nc)
340 if (nc->incoming_queue) {
341 qemu_del_net_queue(nc->incoming_queue);
343 if (nc->peer) {
344 nc->peer->peer = NULL;
346 g_free(nc->name);
347 g_free(nc->model);
348 if (nc->destructor) {
349 nc->destructor(nc);
353 void qemu_del_net_client(NetClientState *nc)
355 NetClientState *ncs[MAX_QUEUE_NUM];
356 int queues, i;
357 NetFilterState *nf, *next;
359 assert(nc->info->type != NET_CLIENT_DRIVER_NIC);
361 /* If the NetClientState belongs to a multiqueue backend, we will change all
362 * other NetClientStates also.
364 queues = qemu_find_net_clients_except(nc->name, ncs,
365 NET_CLIENT_DRIVER_NIC,
366 MAX_QUEUE_NUM);
367 assert(queues != 0);
369 QTAILQ_FOREACH_SAFE(nf, &nc->filters, next, next) {
370 object_unparent(OBJECT(nf));
373 /* If there is a peer NIC, delete and cleanup client, but do not free. */
374 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_NIC) {
375 NICState *nic = qemu_get_nic(nc->peer);
376 if (nic->peer_deleted) {
377 return;
379 nic->peer_deleted = true;
381 for (i = 0; i < queues; i++) {
382 ncs[i]->peer->link_down = true;
385 if (nc->peer->info->link_status_changed) {
386 nc->peer->info->link_status_changed(nc->peer);
389 for (i = 0; i < queues; i++) {
390 qemu_cleanup_net_client(ncs[i]);
393 return;
396 for (i = 0; i < queues; i++) {
397 qemu_cleanup_net_client(ncs[i]);
398 qemu_free_net_client(ncs[i]);
402 void qemu_del_nic(NICState *nic)
404 int i, queues = MAX(nic->conf->peers.queues, 1);
406 qemu_macaddr_set_free(&nic->conf->macaddr);
408 /* If this is a peer NIC and peer has already been deleted, free it now. */
409 if (nic->peer_deleted) {
410 for (i = 0; i < queues; i++) {
411 qemu_free_net_client(qemu_get_subqueue(nic, i)->peer);
415 for (i = queues - 1; i >= 0; i--) {
416 NetClientState *nc = qemu_get_subqueue(nic, i);
418 qemu_cleanup_net_client(nc);
419 qemu_free_net_client(nc);
422 g_free(nic);
425 void qemu_foreach_nic(qemu_nic_foreach func, void *opaque)
427 NetClientState *nc;
429 QTAILQ_FOREACH(nc, &net_clients, next) {
430 if (nc->info->type == NET_CLIENT_DRIVER_NIC) {
431 if (nc->queue_index == 0) {
432 func(qemu_get_nic(nc), opaque);
438 bool qemu_has_ufo(NetClientState *nc)
440 if (!nc || !nc->info->has_ufo) {
441 return false;
444 return nc->info->has_ufo(nc);
447 bool qemu_has_vnet_hdr(NetClientState *nc)
449 if (!nc || !nc->info->has_vnet_hdr) {
450 return false;
453 return nc->info->has_vnet_hdr(nc);
456 bool qemu_has_vnet_hdr_len(NetClientState *nc, int len)
458 if (!nc || !nc->info->has_vnet_hdr_len) {
459 return false;
462 return nc->info->has_vnet_hdr_len(nc, len);
465 void qemu_using_vnet_hdr(NetClientState *nc, bool enable)
467 if (!nc || !nc->info->using_vnet_hdr) {
468 return;
471 nc->info->using_vnet_hdr(nc, enable);
474 void qemu_set_offload(NetClientState *nc, int csum, int tso4, int tso6,
475 int ecn, int ufo)
477 if (!nc || !nc->info->set_offload) {
478 return;
481 nc->info->set_offload(nc, csum, tso4, tso6, ecn, ufo);
484 void qemu_set_vnet_hdr_len(NetClientState *nc, int len)
486 if (!nc || !nc->info->set_vnet_hdr_len) {
487 return;
490 nc->vnet_hdr_len = len;
491 nc->info->set_vnet_hdr_len(nc, len);
494 int qemu_set_vnet_le(NetClientState *nc, bool is_le)
496 #ifdef HOST_WORDS_BIGENDIAN
497 if (!nc || !nc->info->set_vnet_le) {
498 return -ENOSYS;
501 return nc->info->set_vnet_le(nc, is_le);
502 #else
503 return 0;
504 #endif
507 int qemu_set_vnet_be(NetClientState *nc, bool is_be)
509 #ifdef HOST_WORDS_BIGENDIAN
510 return 0;
511 #else
512 if (!nc || !nc->info->set_vnet_be) {
513 return -ENOSYS;
516 return nc->info->set_vnet_be(nc, is_be);
517 #endif
520 int qemu_can_send_packet(NetClientState *sender)
522 int vm_running = runstate_is_running();
524 if (!vm_running) {
525 return 0;
528 if (!sender->peer) {
529 return 1;
532 if (sender->peer->receive_disabled) {
533 return 0;
534 } else if (sender->peer->info->can_receive &&
535 !sender->peer->info->can_receive(sender->peer)) {
536 return 0;
538 return 1;
541 static ssize_t filter_receive_iov(NetClientState *nc,
542 NetFilterDirection direction,
543 NetClientState *sender,
544 unsigned flags,
545 const struct iovec *iov,
546 int iovcnt,
547 NetPacketSent *sent_cb)
549 ssize_t ret = 0;
550 NetFilterState *nf = NULL;
552 if (direction == NET_FILTER_DIRECTION_TX) {
553 QTAILQ_FOREACH(nf, &nc->filters, next) {
554 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov,
555 iovcnt, sent_cb);
556 if (ret) {
557 return ret;
560 } else {
561 QTAILQ_FOREACH_REVERSE(nf, &nc->filters, NetFilterHead, next) {
562 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov,
563 iovcnt, sent_cb);
564 if (ret) {
565 return ret;
570 return ret;
573 static ssize_t filter_receive(NetClientState *nc,
574 NetFilterDirection direction,
575 NetClientState *sender,
576 unsigned flags,
577 const uint8_t *data,
578 size_t size,
579 NetPacketSent *sent_cb)
581 struct iovec iov = {
582 .iov_base = (void *)data,
583 .iov_len = size
586 return filter_receive_iov(nc, direction, sender, flags, &iov, 1, sent_cb);
589 void qemu_purge_queued_packets(NetClientState *nc)
591 if (!nc->peer) {
592 return;
595 qemu_net_queue_purge(nc->peer->incoming_queue, nc);
598 void qemu_flush_or_purge_queued_packets(NetClientState *nc, bool purge)
600 nc->receive_disabled = 0;
602 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_HUBPORT) {
603 if (net_hub_flush(nc->peer)) {
604 qemu_notify_event();
607 if (qemu_net_queue_flush(nc->incoming_queue)) {
608 /* We emptied the queue successfully, signal to the IO thread to repoll
609 * the file descriptor (for tap, for example).
611 qemu_notify_event();
612 } else if (purge) {
613 /* Unable to empty the queue, purge remaining packets */
614 qemu_net_queue_purge(nc->incoming_queue, nc);
618 void qemu_flush_queued_packets(NetClientState *nc)
620 qemu_flush_or_purge_queued_packets(nc, false);
623 static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender,
624 unsigned flags,
625 const uint8_t *buf, int size,
626 NetPacketSent *sent_cb)
628 NetQueue *queue;
629 int ret;
631 #ifdef DEBUG_NET
632 printf("qemu_send_packet_async:\n");
633 qemu_hexdump((const char *)buf, stdout, "net", size);
634 #endif
636 if (sender->link_down || !sender->peer) {
637 return size;
640 /* Let filters handle the packet first */
641 ret = filter_receive(sender, NET_FILTER_DIRECTION_TX,
642 sender, flags, buf, size, sent_cb);
643 if (ret) {
644 return ret;
647 ret = filter_receive(sender->peer, NET_FILTER_DIRECTION_RX,
648 sender, flags, buf, size, sent_cb);
649 if (ret) {
650 return ret;
653 queue = sender->peer->incoming_queue;
655 return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb);
658 ssize_t qemu_send_packet_async(NetClientState *sender,
659 const uint8_t *buf, int size,
660 NetPacketSent *sent_cb)
662 return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE,
663 buf, size, sent_cb);
666 void qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size)
668 qemu_send_packet_async(nc, buf, size, NULL);
671 ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size)
673 return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW,
674 buf, size, NULL);
677 static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov,
678 int iovcnt, unsigned flags)
680 uint8_t *buf = NULL;
681 uint8_t *buffer;
682 size_t offset;
683 ssize_t ret;
685 if (iovcnt == 1) {
686 buffer = iov[0].iov_base;
687 offset = iov[0].iov_len;
688 } else {
689 offset = iov_size(iov, iovcnt);
690 if (offset > NET_BUFSIZE) {
691 return -1;
693 buf = g_malloc(offset);
694 buffer = buf;
695 offset = iov_to_buf(iov, iovcnt, 0, buf, offset);
698 if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) {
699 ret = nc->info->receive_raw(nc, buffer, offset);
700 } else {
701 ret = nc->info->receive(nc, buffer, offset);
704 g_free(buf);
705 return ret;
708 ssize_t qemu_deliver_packet_iov(NetClientState *sender,
709 unsigned flags,
710 const struct iovec *iov,
711 int iovcnt,
712 void *opaque)
714 NetClientState *nc = opaque;
715 int ret;
717 if (nc->link_down) {
718 return iov_size(iov, iovcnt);
721 if (nc->receive_disabled) {
722 return 0;
725 if (nc->info->receive_iov && !(flags & QEMU_NET_PACKET_FLAG_RAW)) {
726 ret = nc->info->receive_iov(nc, iov, iovcnt);
727 } else {
728 ret = nc_sendv_compat(nc, iov, iovcnt, flags);
731 if (ret == 0) {
732 nc->receive_disabled = 1;
735 return ret;
738 ssize_t qemu_sendv_packet_async(NetClientState *sender,
739 const struct iovec *iov, int iovcnt,
740 NetPacketSent *sent_cb)
742 NetQueue *queue;
743 int ret;
745 if (sender->link_down || !sender->peer) {
746 return iov_size(iov, iovcnt);
749 /* Let filters handle the packet first */
750 ret = filter_receive_iov(sender, NET_FILTER_DIRECTION_TX, sender,
751 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb);
752 if (ret) {
753 return ret;
756 ret = filter_receive_iov(sender->peer, NET_FILTER_DIRECTION_RX, sender,
757 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb);
758 if (ret) {
759 return ret;
762 queue = sender->peer->incoming_queue;
764 return qemu_net_queue_send_iov(queue, sender,
765 QEMU_NET_PACKET_FLAG_NONE,
766 iov, iovcnt, sent_cb);
769 ssize_t
770 qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt)
772 return qemu_sendv_packet_async(nc, iov, iovcnt, NULL);
775 NetClientState *qemu_find_netdev(const char *id)
777 NetClientState *nc;
779 QTAILQ_FOREACH(nc, &net_clients, next) {
780 if (nc->info->type == NET_CLIENT_DRIVER_NIC)
781 continue;
782 if (!strcmp(nc->name, id)) {
783 return nc;
787 return NULL;
790 int qemu_find_net_clients_except(const char *id, NetClientState **ncs,
791 NetClientDriver type, int max)
793 NetClientState *nc;
794 int ret = 0;
796 QTAILQ_FOREACH(nc, &net_clients, next) {
797 if (nc->info->type == type) {
798 continue;
800 if (!id || !strcmp(nc->name, id)) {
801 if (ret < max) {
802 ncs[ret] = nc;
804 ret++;
808 return ret;
811 static int nic_get_free_idx(void)
813 int index;
815 for (index = 0; index < MAX_NICS; index++)
816 if (!nd_table[index].used)
817 return index;
818 return -1;
821 int qemu_show_nic_models(const char *arg, const char *const *models)
823 int i;
825 if (!arg || !is_help_option(arg)) {
826 return 0;
829 fprintf(stderr, "qemu: Supported NIC models: ");
830 for (i = 0 ; models[i]; i++)
831 fprintf(stderr, "%s%c", models[i], models[i+1] ? ',' : '\n');
832 return 1;
835 void qemu_check_nic_model(NICInfo *nd, const char *model)
837 const char *models[2];
839 models[0] = model;
840 models[1] = NULL;
842 if (qemu_show_nic_models(nd->model, models))
843 exit(0);
844 if (qemu_find_nic_model(nd, models, model) < 0)
845 exit(1);
848 int qemu_find_nic_model(NICInfo *nd, const char * const *models,
849 const char *default_model)
851 int i;
853 if (!nd->model)
854 nd->model = g_strdup(default_model);
856 for (i = 0 ; models[i]; i++) {
857 if (strcmp(nd->model, models[i]) == 0)
858 return i;
861 error_report("Unsupported NIC model: %s", nd->model);
862 return -1;
865 static int net_init_nic(const Netdev *netdev, const char *name,
866 NetClientState *peer, Error **errp)
868 int idx;
869 NICInfo *nd;
870 const NetLegacyNicOptions *nic;
872 assert(netdev->type == NET_CLIENT_DRIVER_NIC);
873 nic = &netdev->u.nic;
875 idx = nic_get_free_idx();
876 if (idx == -1 || nb_nics >= MAX_NICS) {
877 error_setg(errp, "too many NICs");
878 return -1;
881 nd = &nd_table[idx];
883 memset(nd, 0, sizeof(*nd));
885 if (nic->has_netdev) {
886 nd->netdev = qemu_find_netdev(nic->netdev);
887 if (!nd->netdev) {
888 error_setg(errp, "netdev '%s' not found", nic->netdev);
889 return -1;
891 } else {
892 assert(peer);
893 nd->netdev = peer;
895 nd->name = g_strdup(name);
896 if (nic->has_model) {
897 nd->model = g_strdup(nic->model);
899 if (nic->has_addr) {
900 nd->devaddr = g_strdup(nic->addr);
903 if (nic->has_macaddr &&
904 net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) {
905 error_setg(errp, "invalid syntax for ethernet address");
906 return -1;
908 if (nic->has_macaddr &&
909 is_multicast_ether_addr(nd->macaddr.a)) {
910 error_setg(errp,
911 "NIC cannot have multicast MAC address (odd 1st byte)");
912 return -1;
914 qemu_macaddr_default_if_unset(&nd->macaddr);
916 if (nic->has_vectors) {
917 if (nic->vectors > 0x7ffffff) {
918 error_setg(errp, "invalid # of vectors: %"PRIu32, nic->vectors);
919 return -1;
921 nd->nvectors = nic->vectors;
922 } else {
923 nd->nvectors = DEV_NVECTORS_UNSPECIFIED;
926 nd->used = 1;
927 nb_nics++;
929 return idx;
933 static int (* const net_client_init_fun[NET_CLIENT_DRIVER__MAX])(
934 const Netdev *netdev,
935 const char *name,
936 NetClientState *peer, Error **errp) = {
937 [NET_CLIENT_DRIVER_NIC] = net_init_nic,
938 #ifdef CONFIG_SLIRP
939 [NET_CLIENT_DRIVER_USER] = net_init_slirp,
940 #endif
941 [NET_CLIENT_DRIVER_TAP] = net_init_tap,
942 [NET_CLIENT_DRIVER_SOCKET] = net_init_socket,
943 #ifdef CONFIG_VDE
944 [NET_CLIENT_DRIVER_VDE] = net_init_vde,
945 #endif
946 #ifdef CONFIG_NETMAP
947 [NET_CLIENT_DRIVER_NETMAP] = net_init_netmap,
948 #endif
949 #ifdef CONFIG_NET_BRIDGE
950 [NET_CLIENT_DRIVER_BRIDGE] = net_init_bridge,
951 #endif
952 [NET_CLIENT_DRIVER_HUBPORT] = net_init_hubport,
953 #ifdef CONFIG_VHOST_NET_USED
954 [NET_CLIENT_DRIVER_VHOST_USER] = net_init_vhost_user,
955 #endif
956 #ifdef CONFIG_L2TPV3
957 [NET_CLIENT_DRIVER_L2TPV3] = net_init_l2tpv3,
958 #endif
962 static int net_client_init1(const void *object, bool is_netdev, Error **errp)
964 Netdev legacy = {0};
965 const Netdev *netdev;
966 const char *name;
967 NetClientState *peer = NULL;
969 if (is_netdev) {
970 netdev = object;
971 name = netdev->id;
973 if (netdev->type == NET_CLIENT_DRIVER_NIC ||
974 !net_client_init_fun[netdev->type]) {
975 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
976 "a netdev backend type");
977 return -1;
979 } else {
980 const NetLegacy *net = object;
981 const NetLegacyOptions *opts = net->opts;
982 legacy.id = net->id;
983 netdev = &legacy;
984 /* missing optional values have been initialized to "all bits zero" */
985 name = net->has_id ? net->id : net->name;
987 /* Map the old options to the new flat type */
988 switch (opts->type) {
989 case NET_LEGACY_OPTIONS_TYPE_NONE:
990 return 0; /* nothing to do */
991 case NET_LEGACY_OPTIONS_TYPE_NIC:
992 legacy.type = NET_CLIENT_DRIVER_NIC;
993 legacy.u.nic = opts->u.nic;
994 break;
995 case NET_LEGACY_OPTIONS_TYPE_USER:
996 legacy.type = NET_CLIENT_DRIVER_USER;
997 legacy.u.user = opts->u.user;
998 break;
999 case NET_LEGACY_OPTIONS_TYPE_TAP:
1000 legacy.type = NET_CLIENT_DRIVER_TAP;
1001 legacy.u.tap = opts->u.tap;
1002 break;
1003 case NET_LEGACY_OPTIONS_TYPE_L2TPV3:
1004 legacy.type = NET_CLIENT_DRIVER_L2TPV3;
1005 legacy.u.l2tpv3 = opts->u.l2tpv3;
1006 break;
1007 case NET_LEGACY_OPTIONS_TYPE_SOCKET:
1008 legacy.type = NET_CLIENT_DRIVER_SOCKET;
1009 legacy.u.socket = opts->u.socket;
1010 break;
1011 case NET_LEGACY_OPTIONS_TYPE_VDE:
1012 legacy.type = NET_CLIENT_DRIVER_VDE;
1013 legacy.u.vde = opts->u.vde;
1014 break;
1015 case NET_LEGACY_OPTIONS_TYPE_BRIDGE:
1016 legacy.type = NET_CLIENT_DRIVER_BRIDGE;
1017 legacy.u.bridge = opts->u.bridge;
1018 break;
1019 case NET_LEGACY_OPTIONS_TYPE_NETMAP:
1020 legacy.type = NET_CLIENT_DRIVER_NETMAP;
1021 legacy.u.netmap = opts->u.netmap;
1022 break;
1023 case NET_LEGACY_OPTIONS_TYPE_VHOST_USER:
1024 legacy.type = NET_CLIENT_DRIVER_VHOST_USER;
1025 legacy.u.vhost_user = opts->u.vhost_user;
1026 break;
1027 default:
1028 abort();
1031 if (!net_client_init_fun[netdev->type]) {
1032 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
1033 "a net backend type (maybe it is not compiled "
1034 "into this binary)");
1035 return -1;
1038 /* Do not add to a hub if it's a nic with a netdev= parameter. */
1039 if (netdev->type != NET_CLIENT_DRIVER_NIC ||
1040 !opts->u.nic.has_netdev) {
1041 peer = net_hub_add_port(0, NULL, NULL);
1045 if (net_client_init_fun[netdev->type](netdev, name, peer, errp) < 0) {
1046 /* FIXME drop when all init functions store an Error */
1047 if (errp && !*errp) {
1048 error_setg(errp, QERR_DEVICE_INIT_FAILED,
1049 NetClientDriver_str(netdev->type));
1051 return -1;
1053 return 0;
1056 static void show_netdevs(void)
1058 int idx;
1059 const char *available_netdevs[] = {
1060 "socket",
1061 "hubport",
1062 "tap",
1063 #ifdef CONFIG_SLIRP
1064 "user",
1065 #endif
1066 #ifdef CONFIG_L2TPV3
1067 "l2tpv3",
1068 #endif
1069 #ifdef CONFIG_VDE
1070 "vde",
1071 #endif
1072 #ifdef CONFIG_NET_BRIDGE
1073 "bridge",
1074 #endif
1075 #ifdef CONFIG_NETMAP
1076 "netmap",
1077 #endif
1078 #ifdef CONFIG_POSIX
1079 "vhost-user",
1080 #endif
1083 printf("Available netdev backend types:\n");
1084 for (idx = 0; idx < ARRAY_SIZE(available_netdevs); idx++) {
1085 puts(available_netdevs[idx]);
1089 static int net_client_init(QemuOpts *opts, bool is_netdev, Error **errp)
1091 void *object = NULL;
1092 Error *err = NULL;
1093 int ret = -1;
1094 Visitor *v = opts_visitor_new(opts);
1096 if (is_netdev && is_help_option(qemu_opt_get(opts, "type"))) {
1097 show_netdevs();
1098 exit(0);
1099 } else {
1100 /* Parse convenience option format ip6-net=fec0::0[/64] */
1101 const char *ip6_net = qemu_opt_get(opts, "ipv6-net");
1103 if (ip6_net) {
1104 char buf[strlen(ip6_net) + 1];
1106 if (get_str_sep(buf, sizeof(buf), &ip6_net, '/') < 0) {
1107 /* Default 64bit prefix length. */
1108 qemu_opt_set(opts, "ipv6-prefix", ip6_net, &error_abort);
1109 qemu_opt_set_number(opts, "ipv6-prefixlen", 64, &error_abort);
1110 } else {
1111 /* User-specified prefix length. */
1112 unsigned long len;
1113 int err;
1115 qemu_opt_set(opts, "ipv6-prefix", buf, &error_abort);
1116 err = qemu_strtoul(ip6_net, NULL, 10, &len);
1118 if (err) {
1119 error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1120 "ipv6-prefix", "a number");
1121 } else {
1122 qemu_opt_set_number(opts, "ipv6-prefixlen", len,
1123 &error_abort);
1126 qemu_opt_unset(opts, "ipv6-net");
1130 if (is_netdev) {
1131 visit_type_Netdev(v, NULL, (Netdev **)&object, &err);
1132 } else {
1133 visit_type_NetLegacy(v, NULL, (NetLegacy **)&object, &err);
1136 if (!err) {
1137 ret = net_client_init1(object, is_netdev, &err);
1140 if (is_netdev) {
1141 qapi_free_Netdev(object);
1142 } else {
1143 qapi_free_NetLegacy(object);
1146 error_propagate(errp, err);
1147 visit_free(v);
1148 return ret;
1151 void netdev_add(QemuOpts *opts, Error **errp)
1153 net_client_init(opts, true, errp);
1156 void qmp_netdev_add(QDict *qdict, QObject **ret, Error **errp)
1158 Error *local_err = NULL;
1159 QemuOptsList *opts_list;
1160 QemuOpts *opts;
1162 opts_list = qemu_find_opts_err("netdev", &local_err);
1163 if (local_err) {
1164 goto out;
1167 opts = qemu_opts_from_qdict(opts_list, qdict, &local_err);
1168 if (local_err) {
1169 goto out;
1172 netdev_add(opts, &local_err);
1173 if (local_err) {
1174 qemu_opts_del(opts);
1175 goto out;
1178 out:
1179 error_propagate(errp, local_err);
1182 void qmp_netdev_del(const char *id, Error **errp)
1184 NetClientState *nc;
1185 QemuOpts *opts;
1187 nc = qemu_find_netdev(id);
1188 if (!nc) {
1189 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1190 "Device '%s' not found", id);
1191 return;
1194 opts = qemu_opts_find(qemu_find_opts_err("netdev", NULL), id);
1195 if (!opts) {
1196 error_setg(errp, "Device '%s' is not a netdev", id);
1197 return;
1200 qemu_del_net_client(nc);
1201 qemu_opts_del(opts);
1204 static void netfilter_print_info(Monitor *mon, NetFilterState *nf)
1206 char *str;
1207 ObjectProperty *prop;
1208 ObjectPropertyIterator iter;
1209 Visitor *v;
1211 /* generate info str */
1212 object_property_iter_init(&iter, OBJECT(nf));
1213 while ((prop = object_property_iter_next(&iter))) {
1214 if (!strcmp(prop->name, "type")) {
1215 continue;
1217 v = string_output_visitor_new(false, &str);
1218 object_property_get(OBJECT(nf), v, prop->name, NULL);
1219 visit_complete(v, &str);
1220 visit_free(v);
1221 monitor_printf(mon, ",%s=%s", prop->name, str);
1222 g_free(str);
1224 monitor_printf(mon, "\n");
1227 void print_net_client(Monitor *mon, NetClientState *nc)
1229 NetFilterState *nf;
1231 monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name,
1232 nc->queue_index,
1233 NetClientDriver_str(nc->info->type),
1234 nc->info_str);
1235 if (!QTAILQ_EMPTY(&nc->filters)) {
1236 monitor_printf(mon, "filters:\n");
1238 QTAILQ_FOREACH(nf, &nc->filters, next) {
1239 char *path = object_get_canonical_path_component(OBJECT(nf));
1241 monitor_printf(mon, " - %s: type=%s", path,
1242 object_get_typename(OBJECT(nf)));
1243 netfilter_print_info(mon, nf);
1244 g_free(path);
1248 RxFilterInfoList *qmp_query_rx_filter(bool has_name, const char *name,
1249 Error **errp)
1251 NetClientState *nc;
1252 RxFilterInfoList *filter_list = NULL, *last_entry = NULL;
1254 QTAILQ_FOREACH(nc, &net_clients, next) {
1255 RxFilterInfoList *entry;
1256 RxFilterInfo *info;
1258 if (has_name && strcmp(nc->name, name) != 0) {
1259 continue;
1262 /* only query rx-filter information of NIC */
1263 if (nc->info->type != NET_CLIENT_DRIVER_NIC) {
1264 if (has_name) {
1265 error_setg(errp, "net client(%s) isn't a NIC", name);
1266 return NULL;
1268 continue;
1271 /* only query information on queue 0 since the info is per nic,
1272 * not per queue
1274 if (nc->queue_index != 0)
1275 continue;
1277 if (nc->info->query_rx_filter) {
1278 info = nc->info->query_rx_filter(nc);
1279 entry = g_malloc0(sizeof(*entry));
1280 entry->value = info;
1282 if (!filter_list) {
1283 filter_list = entry;
1284 } else {
1285 last_entry->next = entry;
1287 last_entry = entry;
1288 } else if (has_name) {
1289 error_setg(errp, "net client(%s) doesn't support"
1290 " rx-filter querying", name);
1291 return NULL;
1294 if (has_name) {
1295 break;
1299 if (filter_list == NULL && has_name) {
1300 error_setg(errp, "invalid net client name: %s", name);
1303 return filter_list;
1306 void hmp_info_network(Monitor *mon, const QDict *qdict)
1308 NetClientState *nc, *peer;
1309 NetClientDriver type;
1311 net_hub_info(mon);
1313 QTAILQ_FOREACH(nc, &net_clients, next) {
1314 peer = nc->peer;
1315 type = nc->info->type;
1317 /* Skip if already printed in hub info */
1318 if (net_hub_id_for_client(nc, NULL) == 0) {
1319 continue;
1322 if (!peer || type == NET_CLIENT_DRIVER_NIC) {
1323 print_net_client(mon, nc);
1324 } /* else it's a netdev connected to a NIC, printed with the NIC */
1325 if (peer && type == NET_CLIENT_DRIVER_NIC) {
1326 monitor_printf(mon, " \\ ");
1327 print_net_client(mon, peer);
1332 void qmp_set_link(const char *name, bool up, Error **errp)
1334 NetClientState *ncs[MAX_QUEUE_NUM];
1335 NetClientState *nc;
1336 int queues, i;
1338 queues = qemu_find_net_clients_except(name, ncs,
1339 NET_CLIENT_DRIVER__MAX,
1340 MAX_QUEUE_NUM);
1342 if (queues == 0) {
1343 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1344 "Device '%s' not found", name);
1345 return;
1347 nc = ncs[0];
1349 for (i = 0; i < queues; i++) {
1350 ncs[i]->link_down = !up;
1353 if (nc->info->link_status_changed) {
1354 nc->info->link_status_changed(nc);
1357 if (nc->peer) {
1358 /* Change peer link only if the peer is NIC and then notify peer.
1359 * If the peer is a HUBPORT or a backend, we do not change the
1360 * link status.
1362 * This behavior is compatible with qemu hubs where there could be
1363 * multiple clients that can still communicate with each other in
1364 * disconnected mode. For now maintain this compatibility.
1366 if (nc->peer->info->type == NET_CLIENT_DRIVER_NIC) {
1367 for (i = 0; i < queues; i++) {
1368 ncs[i]->peer->link_down = !up;
1371 if (nc->peer->info->link_status_changed) {
1372 nc->peer->info->link_status_changed(nc->peer);
1377 static void net_vm_change_state_handler(void *opaque, int running,
1378 RunState state)
1380 NetClientState *nc;
1381 NetClientState *tmp;
1383 QTAILQ_FOREACH_SAFE(nc, &net_clients, next, tmp) {
1384 if (running) {
1385 /* Flush queued packets and wake up backends. */
1386 if (nc->peer && qemu_can_send_packet(nc)) {
1387 qemu_flush_queued_packets(nc->peer);
1389 } else {
1390 /* Complete all queued packets, to guarantee we don't modify
1391 * state later when VM is not running.
1393 qemu_flush_or_purge_queued_packets(nc, true);
1398 void net_cleanup(void)
1400 NetClientState *nc;
1402 /* We may del multiple entries during qemu_del_net_client(),
1403 * so QTAILQ_FOREACH_SAFE() is also not safe here.
1405 while (!QTAILQ_EMPTY(&net_clients)) {
1406 nc = QTAILQ_FIRST(&net_clients);
1407 if (nc->info->type == NET_CLIENT_DRIVER_NIC) {
1408 qemu_del_nic(qemu_get_nic(nc));
1409 } else {
1410 qemu_del_net_client(nc);
1414 qemu_del_vm_change_state_handler(net_change_state_entry);
1417 void net_check_clients(void)
1419 NetClientState *nc;
1420 int i;
1422 net_hub_check_clients();
1424 QTAILQ_FOREACH(nc, &net_clients, next) {
1425 if (!nc->peer) {
1426 warn_report("%s %s has no peer",
1427 nc->info->type == NET_CLIENT_DRIVER_NIC
1428 ? "nic" : "netdev",
1429 nc->name);
1433 /* Check that all NICs requested via -net nic actually got created.
1434 * NICs created via -device don't need to be checked here because
1435 * they are always instantiated.
1437 for (i = 0; i < MAX_NICS; i++) {
1438 NICInfo *nd = &nd_table[i];
1439 if (nd->used && !nd->instantiated) {
1440 warn_report("requested NIC (%s, model %s) "
1441 "was not created (not supported by this machine?)",
1442 nd->name ? nd->name : "anonymous",
1443 nd->model ? nd->model : "unspecified");
1448 static int net_init_client(void *dummy, QemuOpts *opts, Error **errp)
1450 return net_client_init(opts, false, errp);
1453 static int net_init_netdev(void *dummy, QemuOpts *opts, Error **errp)
1455 return net_client_init(opts, true, errp);
1458 /* For the convenience "--nic" parameter */
1459 static int net_param_nic(void *dummy, QemuOpts *opts, Error **errp)
1461 char *mac, *nd_id;
1462 int idx, ret;
1463 NICInfo *ni;
1464 const char *type;
1466 type = qemu_opt_get(opts, "type");
1467 if (type && g_str_equal(type, "none")) {
1468 return 0; /* Nothing to do, default_net is cleared in vl.c */
1471 idx = nic_get_free_idx();
1472 if (idx == -1 || nb_nics >= MAX_NICS) {
1473 error_setg(errp, "no more on-board/default NIC slots available");
1474 return -1;
1477 if (!type) {
1478 qemu_opt_set(opts, "type", "user", &error_abort);
1481 ni = &nd_table[idx];
1482 memset(ni, 0, sizeof(*ni));
1483 ni->model = qemu_opt_get_del(opts, "model");
1485 /* Create an ID if the user did not specify one */
1486 nd_id = g_strdup(qemu_opts_id(opts));
1487 if (!nd_id) {
1488 nd_id = g_strdup_printf("__org.qemu.nic%i\n", idx);
1489 qemu_opts_set_id(opts, nd_id);
1492 /* Handle MAC address */
1493 mac = qemu_opt_get_del(opts, "mac");
1494 if (mac) {
1495 ret = net_parse_macaddr(ni->macaddr.a, mac);
1496 g_free(mac);
1497 if (ret) {
1498 error_setg(errp, "invalid syntax for ethernet address");
1499 goto out;
1501 if (is_multicast_ether_addr(ni->macaddr.a)) {
1502 error_setg(errp, "NIC cannot have multicast MAC address");
1503 ret = -1;
1504 goto out;
1507 qemu_macaddr_default_if_unset(&ni->macaddr);
1509 ret = net_client_init(opts, true, errp);
1510 if (ret == 0) {
1511 ni->netdev = qemu_find_netdev(nd_id);
1512 ni->used = true;
1513 nb_nics++;
1516 out:
1517 g_free(nd_id);
1518 return ret;
1521 int net_init_clients(Error **errp)
1523 net_change_state_entry =
1524 qemu_add_vm_change_state_handler(net_vm_change_state_handler, NULL);
1526 QTAILQ_INIT(&net_clients);
1528 if (qemu_opts_foreach(qemu_find_opts("netdev"),
1529 net_init_netdev, NULL, errp)) {
1530 return -1;
1533 if (qemu_opts_foreach(qemu_find_opts("nic"), net_param_nic, NULL, errp)) {
1534 return -1;
1537 if (qemu_opts_foreach(qemu_find_opts("net"), net_init_client, NULL, errp)) {
1538 return -1;
1541 return 0;
1544 int net_client_parse(QemuOptsList *opts_list, const char *optarg)
1546 if (!qemu_opts_parse_noisily(opts_list, optarg, true)) {
1547 return -1;
1550 return 0;
1553 /* From FreeBSD */
1554 /* XXX: optimize */
1555 uint32_t net_crc32(const uint8_t *p, int len)
1557 uint32_t crc;
1558 int carry, i, j;
1559 uint8_t b;
1561 crc = 0xffffffff;
1562 for (i = 0; i < len; i++) {
1563 b = *p++;
1564 for (j = 0; j < 8; j++) {
1565 carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01);
1566 crc <<= 1;
1567 b >>= 1;
1568 if (carry) {
1569 crc = ((crc ^ POLYNOMIAL_BE) | carry);
1574 return crc;
1577 uint32_t net_crc32_le(const uint8_t *p, int len)
1579 uint32_t crc;
1580 int carry, i, j;
1581 uint8_t b;
1583 crc = 0xffffffff;
1584 for (i = 0; i < len; i++) {
1585 b = *p++;
1586 for (j = 0; j < 8; j++) {
1587 carry = (crc & 0x1) ^ (b & 0x01);
1588 crc >>= 1;
1589 b >>= 1;
1590 if (carry) {
1591 crc ^= POLYNOMIAL_LE;
1596 return crc;
1599 QemuOptsList qemu_netdev_opts = {
1600 .name = "netdev",
1601 .implied_opt_name = "type",
1602 .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head),
1603 .desc = {
1605 * no elements => accept any params
1606 * validation will happen later
1608 { /* end of list */ }
1612 QemuOptsList qemu_nic_opts = {
1613 .name = "nic",
1614 .implied_opt_name = "type",
1615 .head = QTAILQ_HEAD_INITIALIZER(qemu_nic_opts.head),
1616 .desc = {
1618 * no elements => accept any params
1619 * validation will happen later
1621 { /* end of list */ }
1625 QemuOptsList qemu_net_opts = {
1626 .name = "net",
1627 .implied_opt_name = "type",
1628 .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head),
1629 .desc = {
1631 * no elements => accept any params
1632 * validation will happen later
1634 { /* end of list */ }
1638 void net_socket_rs_init(SocketReadState *rs,
1639 SocketReadStateFinalize *finalize,
1640 bool vnet_hdr)
1642 rs->state = 0;
1643 rs->vnet_hdr = vnet_hdr;
1644 rs->index = 0;
1645 rs->packet_len = 0;
1646 rs->vnet_hdr_len = 0;
1647 memset(rs->buf, 0, sizeof(rs->buf));
1648 rs->finalize = finalize;
1652 * Returns
1653 * 0: success
1654 * -1: error occurs
1656 int net_fill_rstate(SocketReadState *rs, const uint8_t *buf, int size)
1658 unsigned int l;
1660 while (size > 0) {
1661 /* Reassemble a packet from the network.
1662 * 0 = getting length.
1663 * 1 = getting vnet header length.
1664 * 2 = getting data.
1666 switch (rs->state) {
1667 case 0:
1668 l = 4 - rs->index;
1669 if (l > size) {
1670 l = size;
1672 memcpy(rs->buf + rs->index, buf, l);
1673 buf += l;
1674 size -= l;
1675 rs->index += l;
1676 if (rs->index == 4) {
1677 /* got length */
1678 rs->packet_len = ntohl(*(uint32_t *)rs->buf);
1679 rs->index = 0;
1680 if (rs->vnet_hdr) {
1681 rs->state = 1;
1682 } else {
1683 rs->state = 2;
1684 rs->vnet_hdr_len = 0;
1687 break;
1688 case 1:
1689 l = 4 - rs->index;
1690 if (l > size) {
1691 l = size;
1693 memcpy(rs->buf + rs->index, buf, l);
1694 buf += l;
1695 size -= l;
1696 rs->index += l;
1697 if (rs->index == 4) {
1698 /* got vnet header length */
1699 rs->vnet_hdr_len = ntohl(*(uint32_t *)rs->buf);
1700 rs->index = 0;
1701 rs->state = 2;
1703 break;
1704 case 2:
1705 l = rs->packet_len - rs->index;
1706 if (l > size) {
1707 l = size;
1709 if (rs->index + l <= sizeof(rs->buf)) {
1710 memcpy(rs->buf + rs->index, buf, l);
1711 } else {
1712 fprintf(stderr, "serious error: oversized packet received,"
1713 "connection terminated.\n");
1714 rs->index = rs->state = 0;
1715 return -1;
1718 rs->index += l;
1719 buf += l;
1720 size -= l;
1721 if (rs->index >= rs->packet_len) {
1722 rs->index = 0;
1723 rs->state = 0;
1724 assert(rs->finalize);
1725 rs->finalize(rs);
1727 break;
1731 assert(size == 0);
1732 return 0;