s390x/tcg: Implement VECTOR LOAD POSITIVE
[qemu/ar7.git] / net / net.c
blob2cf5e7646997fd78b86562af5769e27ce2f729cc
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);
234 static ssize_t qemu_deliver_packet_iov(NetClientState *sender,
235 unsigned flags,
236 const struct iovec *iov,
237 int iovcnt,
238 void *opaque);
240 static void qemu_net_client_setup(NetClientState *nc,
241 NetClientInfo *info,
242 NetClientState *peer,
243 const char *model,
244 const char *name,
245 NetClientDestructor *destructor)
247 nc->info = info;
248 nc->model = g_strdup(model);
249 if (name) {
250 nc->name = g_strdup(name);
251 } else {
252 nc->name = assign_name(nc, model);
255 if (peer) {
256 assert(!peer->peer);
257 nc->peer = peer;
258 peer->peer = nc;
260 QTAILQ_INSERT_TAIL(&net_clients, nc, next);
262 nc->incoming_queue = qemu_new_net_queue(qemu_deliver_packet_iov, nc);
263 nc->destructor = destructor;
264 QTAILQ_INIT(&nc->filters);
267 NetClientState *qemu_new_net_client(NetClientInfo *info,
268 NetClientState *peer,
269 const char *model,
270 const char *name)
272 NetClientState *nc;
274 assert(info->size >= sizeof(NetClientState));
276 nc = g_malloc0(info->size);
277 qemu_net_client_setup(nc, info, peer, model, name,
278 qemu_net_client_destructor);
280 return nc;
283 NICState *qemu_new_nic(NetClientInfo *info,
284 NICConf *conf,
285 const char *model,
286 const char *name,
287 void *opaque)
289 NetClientState **peers = conf->peers.ncs;
290 NICState *nic;
291 int i, queues = MAX(1, conf->peers.queues);
293 assert(info->type == NET_CLIENT_DRIVER_NIC);
294 assert(info->size >= sizeof(NICState));
296 nic = g_malloc0(info->size + sizeof(NetClientState) * queues);
297 nic->ncs = (void *)nic + info->size;
298 nic->conf = conf;
299 nic->opaque = opaque;
301 for (i = 0; i < queues; i++) {
302 qemu_net_client_setup(&nic->ncs[i], info, peers[i], model, name,
303 NULL);
304 nic->ncs[i].queue_index = i;
307 return nic;
310 NetClientState *qemu_get_subqueue(NICState *nic, int queue_index)
312 return nic->ncs + queue_index;
315 NetClientState *qemu_get_queue(NICState *nic)
317 return qemu_get_subqueue(nic, 0);
320 NICState *qemu_get_nic(NetClientState *nc)
322 NetClientState *nc0 = nc - nc->queue_index;
324 return (NICState *)((void *)nc0 - nc->info->size);
327 void *qemu_get_nic_opaque(NetClientState *nc)
329 NICState *nic = qemu_get_nic(nc);
331 return nic->opaque;
334 static void qemu_cleanup_net_client(NetClientState *nc)
336 QTAILQ_REMOVE(&net_clients, nc, next);
338 if (nc->info->cleanup) {
339 nc->info->cleanup(nc);
343 static void qemu_free_net_client(NetClientState *nc)
345 if (nc->incoming_queue) {
346 qemu_del_net_queue(nc->incoming_queue);
348 if (nc->peer) {
349 nc->peer->peer = NULL;
351 g_free(nc->name);
352 g_free(nc->model);
353 if (nc->destructor) {
354 nc->destructor(nc);
358 void qemu_del_net_client(NetClientState *nc)
360 NetClientState *ncs[MAX_QUEUE_NUM];
361 int queues, i;
362 NetFilterState *nf, *next;
364 assert(nc->info->type != NET_CLIENT_DRIVER_NIC);
366 /* If the NetClientState belongs to a multiqueue backend, we will change all
367 * other NetClientStates also.
369 queues = qemu_find_net_clients_except(nc->name, ncs,
370 NET_CLIENT_DRIVER_NIC,
371 MAX_QUEUE_NUM);
372 assert(queues != 0);
374 QTAILQ_FOREACH_SAFE(nf, &nc->filters, next, next) {
375 object_unparent(OBJECT(nf));
378 /* If there is a peer NIC, delete and cleanup client, but do not free. */
379 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_NIC) {
380 NICState *nic = qemu_get_nic(nc->peer);
381 if (nic->peer_deleted) {
382 return;
384 nic->peer_deleted = true;
386 for (i = 0; i < queues; i++) {
387 ncs[i]->peer->link_down = true;
390 if (nc->peer->info->link_status_changed) {
391 nc->peer->info->link_status_changed(nc->peer);
394 for (i = 0; i < queues; i++) {
395 qemu_cleanup_net_client(ncs[i]);
398 return;
401 for (i = 0; i < queues; i++) {
402 qemu_cleanup_net_client(ncs[i]);
403 qemu_free_net_client(ncs[i]);
407 void qemu_del_nic(NICState *nic)
409 int i, queues = MAX(nic->conf->peers.queues, 1);
411 qemu_macaddr_set_free(&nic->conf->macaddr);
413 /* If this is a peer NIC and peer has already been deleted, free it now. */
414 if (nic->peer_deleted) {
415 for (i = 0; i < queues; i++) {
416 qemu_free_net_client(qemu_get_subqueue(nic, i)->peer);
420 for (i = queues - 1; i >= 0; i--) {
421 NetClientState *nc = qemu_get_subqueue(nic, i);
423 qemu_cleanup_net_client(nc);
424 qemu_free_net_client(nc);
427 g_free(nic);
430 void qemu_foreach_nic(qemu_nic_foreach func, void *opaque)
432 NetClientState *nc;
434 QTAILQ_FOREACH(nc, &net_clients, next) {
435 if (nc->info->type == NET_CLIENT_DRIVER_NIC) {
436 if (nc->queue_index == 0) {
437 func(qemu_get_nic(nc), opaque);
443 bool qemu_has_ufo(NetClientState *nc)
445 if (!nc || !nc->info->has_ufo) {
446 return false;
449 return nc->info->has_ufo(nc);
452 bool qemu_has_vnet_hdr(NetClientState *nc)
454 if (!nc || !nc->info->has_vnet_hdr) {
455 return false;
458 return nc->info->has_vnet_hdr(nc);
461 bool qemu_has_vnet_hdr_len(NetClientState *nc, int len)
463 if (!nc || !nc->info->has_vnet_hdr_len) {
464 return false;
467 return nc->info->has_vnet_hdr_len(nc, len);
470 void qemu_using_vnet_hdr(NetClientState *nc, bool enable)
472 if (!nc || !nc->info->using_vnet_hdr) {
473 return;
476 nc->info->using_vnet_hdr(nc, enable);
479 void qemu_set_offload(NetClientState *nc, int csum, int tso4, int tso6,
480 int ecn, int ufo)
482 if (!nc || !nc->info->set_offload) {
483 return;
486 nc->info->set_offload(nc, csum, tso4, tso6, ecn, ufo);
489 void qemu_set_vnet_hdr_len(NetClientState *nc, int len)
491 if (!nc || !nc->info->set_vnet_hdr_len) {
492 return;
495 nc->vnet_hdr_len = len;
496 nc->info->set_vnet_hdr_len(nc, len);
499 int qemu_set_vnet_le(NetClientState *nc, bool is_le)
501 #ifdef HOST_WORDS_BIGENDIAN
502 if (!nc || !nc->info->set_vnet_le) {
503 return -ENOSYS;
506 return nc->info->set_vnet_le(nc, is_le);
507 #else
508 return 0;
509 #endif
512 int qemu_set_vnet_be(NetClientState *nc, bool is_be)
514 #ifdef HOST_WORDS_BIGENDIAN
515 return 0;
516 #else
517 if (!nc || !nc->info->set_vnet_be) {
518 return -ENOSYS;
521 return nc->info->set_vnet_be(nc, is_be);
522 #endif
525 int qemu_can_send_packet(NetClientState *sender)
527 int vm_running = runstate_is_running();
529 if (!vm_running) {
530 return 0;
533 if (!sender->peer) {
534 return 1;
537 if (sender->peer->receive_disabled) {
538 return 0;
539 } else if (sender->peer->info->can_receive &&
540 !sender->peer->info->can_receive(sender->peer)) {
541 return 0;
543 return 1;
546 static ssize_t filter_receive_iov(NetClientState *nc,
547 NetFilterDirection direction,
548 NetClientState *sender,
549 unsigned flags,
550 const struct iovec *iov,
551 int iovcnt,
552 NetPacketSent *sent_cb)
554 ssize_t ret = 0;
555 NetFilterState *nf = NULL;
557 if (direction == NET_FILTER_DIRECTION_TX) {
558 QTAILQ_FOREACH(nf, &nc->filters, next) {
559 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov,
560 iovcnt, sent_cb);
561 if (ret) {
562 return ret;
565 } else {
566 QTAILQ_FOREACH_REVERSE(nf, &nc->filters, next) {
567 ret = qemu_netfilter_receive(nf, direction, sender, flags, iov,
568 iovcnt, sent_cb);
569 if (ret) {
570 return ret;
575 return ret;
578 static ssize_t filter_receive(NetClientState *nc,
579 NetFilterDirection direction,
580 NetClientState *sender,
581 unsigned flags,
582 const uint8_t *data,
583 size_t size,
584 NetPacketSent *sent_cb)
586 struct iovec iov = {
587 .iov_base = (void *)data,
588 .iov_len = size
591 return filter_receive_iov(nc, direction, sender, flags, &iov, 1, sent_cb);
594 void qemu_purge_queued_packets(NetClientState *nc)
596 if (!nc->peer) {
597 return;
600 qemu_net_queue_purge(nc->peer->incoming_queue, nc);
603 void qemu_flush_or_purge_queued_packets(NetClientState *nc, bool purge)
605 nc->receive_disabled = 0;
607 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_HUBPORT) {
608 if (net_hub_flush(nc->peer)) {
609 qemu_notify_event();
612 if (qemu_net_queue_flush(nc->incoming_queue)) {
613 /* We emptied the queue successfully, signal to the IO thread to repoll
614 * the file descriptor (for tap, for example).
616 qemu_notify_event();
617 } else if (purge) {
618 /* Unable to empty the queue, purge remaining packets */
619 qemu_net_queue_purge(nc->incoming_queue, nc);
623 void qemu_flush_queued_packets(NetClientState *nc)
625 qemu_flush_or_purge_queued_packets(nc, false);
628 static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender,
629 unsigned flags,
630 const uint8_t *buf, int size,
631 NetPacketSent *sent_cb)
633 NetQueue *queue;
634 int ret;
636 #ifdef DEBUG_NET
637 printf("qemu_send_packet_async:\n");
638 qemu_hexdump((const char *)buf, stdout, "net", size);
639 #endif
641 if (sender->link_down || !sender->peer) {
642 return size;
645 /* Let filters handle the packet first */
646 ret = filter_receive(sender, NET_FILTER_DIRECTION_TX,
647 sender, flags, buf, size, sent_cb);
648 if (ret) {
649 return ret;
652 ret = filter_receive(sender->peer, NET_FILTER_DIRECTION_RX,
653 sender, flags, buf, size, sent_cb);
654 if (ret) {
655 return ret;
658 queue = sender->peer->incoming_queue;
660 return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb);
663 ssize_t qemu_send_packet_async(NetClientState *sender,
664 const uint8_t *buf, int size,
665 NetPacketSent *sent_cb)
667 return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE,
668 buf, size, sent_cb);
671 ssize_t qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size)
673 return qemu_send_packet_async(nc, buf, size, NULL);
676 ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size)
678 return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW,
679 buf, size, NULL);
682 static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov,
683 int iovcnt, unsigned flags)
685 uint8_t *buf = NULL;
686 uint8_t *buffer;
687 size_t offset;
688 ssize_t ret;
690 if (iovcnt == 1) {
691 buffer = iov[0].iov_base;
692 offset = iov[0].iov_len;
693 } else {
694 offset = iov_size(iov, iovcnt);
695 if (offset > NET_BUFSIZE) {
696 return -1;
698 buf = g_malloc(offset);
699 buffer = buf;
700 offset = iov_to_buf(iov, iovcnt, 0, buf, offset);
703 if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) {
704 ret = nc->info->receive_raw(nc, buffer, offset);
705 } else {
706 ret = nc->info->receive(nc, buffer, offset);
709 g_free(buf);
710 return ret;
713 static ssize_t qemu_deliver_packet_iov(NetClientState *sender,
714 unsigned flags,
715 const struct iovec *iov,
716 int iovcnt,
717 void *opaque)
719 NetClientState *nc = opaque;
720 int ret;
723 if (nc->link_down) {
724 return iov_size(iov, iovcnt);
727 if (nc->receive_disabled) {
728 return 0;
731 if (nc->info->receive_iov && !(flags & QEMU_NET_PACKET_FLAG_RAW)) {
732 ret = nc->info->receive_iov(nc, iov, iovcnt);
733 } else {
734 ret = nc_sendv_compat(nc, iov, iovcnt, flags);
737 if (ret == 0) {
738 nc->receive_disabled = 1;
741 return ret;
744 ssize_t qemu_sendv_packet_async(NetClientState *sender,
745 const struct iovec *iov, int iovcnt,
746 NetPacketSent *sent_cb)
748 NetQueue *queue;
749 size_t size = iov_size(iov, iovcnt);
750 int ret;
752 if (size > NET_BUFSIZE) {
753 return size;
756 if (sender->link_down || !sender->peer) {
757 return size;
760 /* Let filters handle the packet first */
761 ret = filter_receive_iov(sender, NET_FILTER_DIRECTION_TX, sender,
762 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb);
763 if (ret) {
764 return ret;
767 ret = filter_receive_iov(sender->peer, NET_FILTER_DIRECTION_RX, sender,
768 QEMU_NET_PACKET_FLAG_NONE, iov, iovcnt, sent_cb);
769 if (ret) {
770 return ret;
773 queue = sender->peer->incoming_queue;
775 return qemu_net_queue_send_iov(queue, sender,
776 QEMU_NET_PACKET_FLAG_NONE,
777 iov, iovcnt, sent_cb);
780 ssize_t
781 qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt)
783 return qemu_sendv_packet_async(nc, iov, iovcnt, NULL);
786 NetClientState *qemu_find_netdev(const char *id)
788 NetClientState *nc;
790 QTAILQ_FOREACH(nc, &net_clients, next) {
791 if (nc->info->type == NET_CLIENT_DRIVER_NIC)
792 continue;
793 if (!strcmp(nc->name, id)) {
794 return nc;
798 return NULL;
801 int qemu_find_net_clients_except(const char *id, NetClientState **ncs,
802 NetClientDriver type, int max)
804 NetClientState *nc;
805 int ret = 0;
807 QTAILQ_FOREACH(nc, &net_clients, next) {
808 if (nc->info->type == type) {
809 continue;
811 if (!id || !strcmp(nc->name, id)) {
812 if (ret < max) {
813 ncs[ret] = nc;
815 ret++;
819 return ret;
822 static int nic_get_free_idx(void)
824 int index;
826 for (index = 0; index < MAX_NICS; index++)
827 if (!nd_table[index].used)
828 return index;
829 return -1;
832 int qemu_show_nic_models(const char *arg, const char *const *models)
834 int i;
836 if (!arg || !is_help_option(arg)) {
837 return 0;
840 printf("Supported NIC models:\n");
841 for (i = 0 ; models[i]; i++) {
842 printf("%s\n", models[i]);
844 return 1;
847 void qemu_check_nic_model(NICInfo *nd, const char *model)
849 const char *models[2];
851 models[0] = model;
852 models[1] = NULL;
854 if (qemu_show_nic_models(nd->model, models))
855 exit(0);
856 if (qemu_find_nic_model(nd, models, model) < 0)
857 exit(1);
860 int qemu_find_nic_model(NICInfo *nd, const char * const *models,
861 const char *default_model)
863 int i;
865 if (!nd->model)
866 nd->model = g_strdup(default_model);
868 for (i = 0 ; models[i]; i++) {
869 if (strcmp(nd->model, models[i]) == 0)
870 return i;
873 error_report("Unsupported NIC model: %s", nd->model);
874 return -1;
877 static int net_init_nic(const Netdev *netdev, const char *name,
878 NetClientState *peer, Error **errp)
880 int idx;
881 NICInfo *nd;
882 const NetLegacyNicOptions *nic;
884 assert(netdev->type == NET_CLIENT_DRIVER_NIC);
885 nic = &netdev->u.nic;
887 idx = nic_get_free_idx();
888 if (idx == -1 || nb_nics >= MAX_NICS) {
889 error_setg(errp, "too many NICs");
890 return -1;
893 nd = &nd_table[idx];
895 memset(nd, 0, sizeof(*nd));
897 if (nic->has_netdev) {
898 nd->netdev = qemu_find_netdev(nic->netdev);
899 if (!nd->netdev) {
900 error_setg(errp, "netdev '%s' not found", nic->netdev);
901 return -1;
903 } else {
904 assert(peer);
905 nd->netdev = peer;
907 nd->name = g_strdup(name);
908 if (nic->has_model) {
909 nd->model = g_strdup(nic->model);
911 if (nic->has_addr) {
912 nd->devaddr = g_strdup(nic->addr);
915 if (nic->has_macaddr &&
916 net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) {
917 error_setg(errp, "invalid syntax for ethernet address");
918 return -1;
920 if (nic->has_macaddr &&
921 is_multicast_ether_addr(nd->macaddr.a)) {
922 error_setg(errp,
923 "NIC cannot have multicast MAC address (odd 1st byte)");
924 return -1;
926 qemu_macaddr_default_if_unset(&nd->macaddr);
928 if (nic->has_vectors) {
929 if (nic->vectors > 0x7ffffff) {
930 error_setg(errp, "invalid # of vectors: %"PRIu32, nic->vectors);
931 return -1;
933 nd->nvectors = nic->vectors;
934 } else {
935 nd->nvectors = DEV_NVECTORS_UNSPECIFIED;
938 nd->used = 1;
939 nb_nics++;
941 return idx;
945 static int (* const net_client_init_fun[NET_CLIENT_DRIVER__MAX])(
946 const Netdev *netdev,
947 const char *name,
948 NetClientState *peer, Error **errp) = {
949 [NET_CLIENT_DRIVER_NIC] = net_init_nic,
950 #ifdef CONFIG_SLIRP
951 [NET_CLIENT_DRIVER_USER] = net_init_slirp,
952 #endif
953 [NET_CLIENT_DRIVER_TAP] = net_init_tap,
954 [NET_CLIENT_DRIVER_SOCKET] = net_init_socket,
955 #ifdef CONFIG_VDE
956 [NET_CLIENT_DRIVER_VDE] = net_init_vde,
957 #endif
958 #ifdef CONFIG_NETMAP
959 [NET_CLIENT_DRIVER_NETMAP] = net_init_netmap,
960 #endif
961 #ifdef CONFIG_NET_BRIDGE
962 [NET_CLIENT_DRIVER_BRIDGE] = net_init_bridge,
963 #endif
964 [NET_CLIENT_DRIVER_HUBPORT] = net_init_hubport,
965 #ifdef CONFIG_VHOST_NET_USER
966 [NET_CLIENT_DRIVER_VHOST_USER] = net_init_vhost_user,
967 #endif
968 #ifdef CONFIG_L2TPV3
969 [NET_CLIENT_DRIVER_L2TPV3] = net_init_l2tpv3,
970 #endif
974 static int net_client_init1(const void *object, bool is_netdev, Error **errp)
976 Netdev legacy = {0};
977 const Netdev *netdev;
978 const char *name;
979 NetClientState *peer = NULL;
981 if (is_netdev) {
982 netdev = object;
983 name = netdev->id;
985 if (netdev->type == NET_CLIENT_DRIVER_NIC ||
986 !net_client_init_fun[netdev->type]) {
987 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
988 "a netdev backend type");
989 return -1;
991 } else {
992 const NetLegacy *net = object;
993 const NetLegacyOptions *opts = net->opts;
994 legacy.id = net->id;
995 netdev = &legacy;
996 /* missing optional values have been initialized to "all bits zero" */
997 name = net->has_id ? net->id : net->name;
999 if (net->has_name) {
1000 warn_report("The 'name' parameter is deprecated, use 'id' instead");
1003 /* Map the old options to the new flat type */
1004 switch (opts->type) {
1005 case NET_LEGACY_OPTIONS_TYPE_NONE:
1006 return 0; /* nothing to do */
1007 case NET_LEGACY_OPTIONS_TYPE_NIC:
1008 legacy.type = NET_CLIENT_DRIVER_NIC;
1009 legacy.u.nic = opts->u.nic;
1010 break;
1011 case NET_LEGACY_OPTIONS_TYPE_USER:
1012 legacy.type = NET_CLIENT_DRIVER_USER;
1013 legacy.u.user = opts->u.user;
1014 break;
1015 case NET_LEGACY_OPTIONS_TYPE_TAP:
1016 legacy.type = NET_CLIENT_DRIVER_TAP;
1017 legacy.u.tap = opts->u.tap;
1018 break;
1019 case NET_LEGACY_OPTIONS_TYPE_L2TPV3:
1020 legacy.type = NET_CLIENT_DRIVER_L2TPV3;
1021 legacy.u.l2tpv3 = opts->u.l2tpv3;
1022 break;
1023 case NET_LEGACY_OPTIONS_TYPE_SOCKET:
1024 legacy.type = NET_CLIENT_DRIVER_SOCKET;
1025 legacy.u.socket = opts->u.socket;
1026 break;
1027 case NET_LEGACY_OPTIONS_TYPE_VDE:
1028 legacy.type = NET_CLIENT_DRIVER_VDE;
1029 legacy.u.vde = opts->u.vde;
1030 break;
1031 case NET_LEGACY_OPTIONS_TYPE_BRIDGE:
1032 legacy.type = NET_CLIENT_DRIVER_BRIDGE;
1033 legacy.u.bridge = opts->u.bridge;
1034 break;
1035 case NET_LEGACY_OPTIONS_TYPE_NETMAP:
1036 legacy.type = NET_CLIENT_DRIVER_NETMAP;
1037 legacy.u.netmap = opts->u.netmap;
1038 break;
1039 case NET_LEGACY_OPTIONS_TYPE_VHOST_USER:
1040 legacy.type = NET_CLIENT_DRIVER_VHOST_USER;
1041 legacy.u.vhost_user = opts->u.vhost_user;
1042 break;
1043 default:
1044 abort();
1047 if (!net_client_init_fun[netdev->type]) {
1048 error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "type",
1049 "a net backend type (maybe it is not compiled "
1050 "into this binary)");
1051 return -1;
1054 /* Do not add to a hub if it's a nic with a netdev= parameter. */
1055 if (netdev->type != NET_CLIENT_DRIVER_NIC ||
1056 !opts->u.nic.has_netdev) {
1057 peer = net_hub_add_port(0, NULL, NULL);
1061 if (net_client_init_fun[netdev->type](netdev, name, peer, errp) < 0) {
1062 /* FIXME drop when all init functions store an Error */
1063 if (errp && !*errp) {
1064 error_setg(errp, QERR_DEVICE_INIT_FAILED,
1065 NetClientDriver_str(netdev->type));
1067 return -1;
1069 return 0;
1072 static void show_netdevs(void)
1074 int idx;
1075 const char *available_netdevs[] = {
1076 "socket",
1077 "hubport",
1078 "tap",
1079 #ifdef CONFIG_SLIRP
1080 "user",
1081 #endif
1082 #ifdef CONFIG_L2TPV3
1083 "l2tpv3",
1084 #endif
1085 #ifdef CONFIG_VDE
1086 "vde",
1087 #endif
1088 #ifdef CONFIG_NET_BRIDGE
1089 "bridge",
1090 #endif
1091 #ifdef CONFIG_NETMAP
1092 "netmap",
1093 #endif
1094 #ifdef CONFIG_POSIX
1095 "vhost-user",
1096 #endif
1099 printf("Available netdev backend types:\n");
1100 for (idx = 0; idx < ARRAY_SIZE(available_netdevs); idx++) {
1101 puts(available_netdevs[idx]);
1105 static int net_client_init(QemuOpts *opts, bool is_netdev, Error **errp)
1107 void *object = NULL;
1108 Error *err = NULL;
1109 int ret = -1;
1110 Visitor *v = opts_visitor_new(opts);
1112 const char *type = qemu_opt_get(opts, "type");
1114 if (is_netdev && type && is_help_option(type)) {
1115 show_netdevs();
1116 exit(0);
1117 } else {
1118 /* Parse convenience option format ip6-net=fec0::0[/64] */
1119 const char *ip6_net = qemu_opt_get(opts, "ipv6-net");
1121 if (ip6_net) {
1122 char buf[strlen(ip6_net) + 1];
1124 if (get_str_sep(buf, sizeof(buf), &ip6_net, '/') < 0) {
1125 /* Default 64bit prefix length. */
1126 qemu_opt_set(opts, "ipv6-prefix", ip6_net, &error_abort);
1127 qemu_opt_set_number(opts, "ipv6-prefixlen", 64, &error_abort);
1128 } else {
1129 /* User-specified prefix length. */
1130 unsigned long len;
1131 int err;
1133 qemu_opt_set(opts, "ipv6-prefix", buf, &error_abort);
1134 err = qemu_strtoul(ip6_net, NULL, 10, &len);
1136 if (err) {
1137 error_setg(errp, QERR_INVALID_PARAMETER_VALUE,
1138 "ipv6-prefix", "a number");
1139 } else {
1140 qemu_opt_set_number(opts, "ipv6-prefixlen", len,
1141 &error_abort);
1144 qemu_opt_unset(opts, "ipv6-net");
1148 if (is_netdev) {
1149 visit_type_Netdev(v, NULL, (Netdev **)&object, &err);
1150 } else {
1151 visit_type_NetLegacy(v, NULL, (NetLegacy **)&object, &err);
1154 if (!err) {
1155 ret = net_client_init1(object, is_netdev, &err);
1158 if (is_netdev) {
1159 qapi_free_Netdev(object);
1160 } else {
1161 qapi_free_NetLegacy(object);
1164 error_propagate(errp, err);
1165 visit_free(v);
1166 return ret;
1169 void netdev_add(QemuOpts *opts, Error **errp)
1171 net_client_init(opts, true, errp);
1174 void qmp_netdev_add(QDict *qdict, QObject **ret, Error **errp)
1176 Error *local_err = NULL;
1177 QemuOptsList *opts_list;
1178 QemuOpts *opts;
1180 opts_list = qemu_find_opts_err("netdev", &local_err);
1181 if (local_err) {
1182 goto out;
1185 opts = qemu_opts_from_qdict(opts_list, qdict, &local_err);
1186 if (local_err) {
1187 goto out;
1190 netdev_add(opts, &local_err);
1191 if (local_err) {
1192 qemu_opts_del(opts);
1193 goto out;
1196 out:
1197 error_propagate(errp, local_err);
1200 void qmp_netdev_del(const char *id, Error **errp)
1202 NetClientState *nc;
1203 QemuOpts *opts;
1205 nc = qemu_find_netdev(id);
1206 if (!nc) {
1207 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1208 "Device '%s' not found", id);
1209 return;
1212 opts = qemu_opts_find(qemu_find_opts_err("netdev", NULL), id);
1213 if (!opts) {
1214 error_setg(errp, "Device '%s' is not a netdev", id);
1215 return;
1218 qemu_del_net_client(nc);
1219 qemu_opts_del(opts);
1222 static void netfilter_print_info(Monitor *mon, NetFilterState *nf)
1224 char *str;
1225 ObjectProperty *prop;
1226 ObjectPropertyIterator iter;
1227 Visitor *v;
1229 /* generate info str */
1230 object_property_iter_init(&iter, OBJECT(nf));
1231 while ((prop = object_property_iter_next(&iter))) {
1232 if (!strcmp(prop->name, "type")) {
1233 continue;
1235 v = string_output_visitor_new(false, &str);
1236 object_property_get(OBJECT(nf), v, prop->name, NULL);
1237 visit_complete(v, &str);
1238 visit_free(v);
1239 monitor_printf(mon, ",%s=%s", prop->name, str);
1240 g_free(str);
1242 monitor_printf(mon, "\n");
1245 void print_net_client(Monitor *mon, NetClientState *nc)
1247 NetFilterState *nf;
1249 monitor_printf(mon, "%s: index=%d,type=%s,%s\n", nc->name,
1250 nc->queue_index,
1251 NetClientDriver_str(nc->info->type),
1252 nc->info_str);
1253 if (!QTAILQ_EMPTY(&nc->filters)) {
1254 monitor_printf(mon, "filters:\n");
1256 QTAILQ_FOREACH(nf, &nc->filters, next) {
1257 char *path = object_get_canonical_path_component(OBJECT(nf));
1259 monitor_printf(mon, " - %s: type=%s", path,
1260 object_get_typename(OBJECT(nf)));
1261 netfilter_print_info(mon, nf);
1262 g_free(path);
1266 RxFilterInfoList *qmp_query_rx_filter(bool has_name, const char *name,
1267 Error **errp)
1269 NetClientState *nc;
1270 RxFilterInfoList *filter_list = NULL, *last_entry = NULL;
1272 QTAILQ_FOREACH(nc, &net_clients, next) {
1273 RxFilterInfoList *entry;
1274 RxFilterInfo *info;
1276 if (has_name && strcmp(nc->name, name) != 0) {
1277 continue;
1280 /* only query rx-filter information of NIC */
1281 if (nc->info->type != NET_CLIENT_DRIVER_NIC) {
1282 if (has_name) {
1283 error_setg(errp, "net client(%s) isn't a NIC", name);
1284 return NULL;
1286 continue;
1289 /* only query information on queue 0 since the info is per nic,
1290 * not per queue
1292 if (nc->queue_index != 0)
1293 continue;
1295 if (nc->info->query_rx_filter) {
1296 info = nc->info->query_rx_filter(nc);
1297 entry = g_malloc0(sizeof(*entry));
1298 entry->value = info;
1300 if (!filter_list) {
1301 filter_list = entry;
1302 } else {
1303 last_entry->next = entry;
1305 last_entry = entry;
1306 } else if (has_name) {
1307 error_setg(errp, "net client(%s) doesn't support"
1308 " rx-filter querying", name);
1309 return NULL;
1312 if (has_name) {
1313 break;
1317 if (filter_list == NULL && has_name) {
1318 error_setg(errp, "invalid net client name: %s", name);
1321 return filter_list;
1324 void hmp_info_network(Monitor *mon, const QDict *qdict)
1326 NetClientState *nc, *peer;
1327 NetClientDriver type;
1329 net_hub_info(mon);
1331 QTAILQ_FOREACH(nc, &net_clients, next) {
1332 peer = nc->peer;
1333 type = nc->info->type;
1335 /* Skip if already printed in hub info */
1336 if (net_hub_id_for_client(nc, NULL) == 0) {
1337 continue;
1340 if (!peer || type == NET_CLIENT_DRIVER_NIC) {
1341 print_net_client(mon, nc);
1342 } /* else it's a netdev connected to a NIC, printed with the NIC */
1343 if (peer && type == NET_CLIENT_DRIVER_NIC) {
1344 monitor_printf(mon, " \\ ");
1345 print_net_client(mon, peer);
1350 void colo_notify_filters_event(int event, Error **errp)
1352 NetClientState *nc;
1353 NetFilterState *nf;
1354 NetFilterClass *nfc = NULL;
1355 Error *local_err = NULL;
1357 QTAILQ_FOREACH(nc, &net_clients, next) {
1358 QTAILQ_FOREACH(nf, &nc->filters, next) {
1359 nfc = NETFILTER_GET_CLASS(OBJECT(nf));
1360 nfc->handle_event(nf, event, &local_err);
1361 if (local_err) {
1362 error_propagate(errp, local_err);
1363 return;
1369 void qmp_set_link(const char *name, bool up, Error **errp)
1371 NetClientState *ncs[MAX_QUEUE_NUM];
1372 NetClientState *nc;
1373 int queues, i;
1375 queues = qemu_find_net_clients_except(name, ncs,
1376 NET_CLIENT_DRIVER__MAX,
1377 MAX_QUEUE_NUM);
1379 if (queues == 0) {
1380 error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
1381 "Device '%s' not found", name);
1382 return;
1384 nc = ncs[0];
1386 for (i = 0; i < queues; i++) {
1387 ncs[i]->link_down = !up;
1390 if (nc->info->link_status_changed) {
1391 nc->info->link_status_changed(nc);
1394 if (nc->peer) {
1395 /* Change peer link only if the peer is NIC and then notify peer.
1396 * If the peer is a HUBPORT or a backend, we do not change the
1397 * link status.
1399 * This behavior is compatible with qemu hubs where there could be
1400 * multiple clients that can still communicate with each other in
1401 * disconnected mode. For now maintain this compatibility.
1403 if (nc->peer->info->type == NET_CLIENT_DRIVER_NIC) {
1404 for (i = 0; i < queues; i++) {
1405 ncs[i]->peer->link_down = !up;
1408 if (nc->peer->info->link_status_changed) {
1409 nc->peer->info->link_status_changed(nc->peer);
1414 static void net_vm_change_state_handler(void *opaque, int running,
1415 RunState state)
1417 NetClientState *nc;
1418 NetClientState *tmp;
1420 QTAILQ_FOREACH_SAFE(nc, &net_clients, next, tmp) {
1421 if (running) {
1422 /* Flush queued packets and wake up backends. */
1423 if (nc->peer && qemu_can_send_packet(nc)) {
1424 qemu_flush_queued_packets(nc->peer);
1426 } else {
1427 /* Complete all queued packets, to guarantee we don't modify
1428 * state later when VM is not running.
1430 qemu_flush_or_purge_queued_packets(nc, true);
1435 void net_cleanup(void)
1437 NetClientState *nc;
1439 /* We may del multiple entries during qemu_del_net_client(),
1440 * so QTAILQ_FOREACH_SAFE() is also not safe here.
1442 while (!QTAILQ_EMPTY(&net_clients)) {
1443 nc = QTAILQ_FIRST(&net_clients);
1444 if (nc->info->type == NET_CLIENT_DRIVER_NIC) {
1445 qemu_del_nic(qemu_get_nic(nc));
1446 } else {
1447 qemu_del_net_client(nc);
1451 qemu_del_vm_change_state_handler(net_change_state_entry);
1454 void net_check_clients(void)
1456 NetClientState *nc;
1457 int i;
1459 net_hub_check_clients();
1461 QTAILQ_FOREACH(nc, &net_clients, next) {
1462 if (!nc->peer) {
1463 warn_report("%s %s has no peer",
1464 nc->info->type == NET_CLIENT_DRIVER_NIC
1465 ? "nic" : "netdev",
1466 nc->name);
1470 /* Check that all NICs requested via -net nic actually got created.
1471 * NICs created via -device don't need to be checked here because
1472 * they are always instantiated.
1474 for (i = 0; i < MAX_NICS; i++) {
1475 NICInfo *nd = &nd_table[i];
1476 if (nd->used && !nd->instantiated) {
1477 warn_report("requested NIC (%s, model %s) "
1478 "was not created (not supported by this machine?)",
1479 nd->name ? nd->name : "anonymous",
1480 nd->model ? nd->model : "unspecified");
1485 static int net_init_client(void *dummy, QemuOpts *opts, Error **errp)
1487 return net_client_init(opts, false, errp);
1490 static int net_init_netdev(void *dummy, QemuOpts *opts, Error **errp)
1492 return net_client_init(opts, true, errp);
1495 /* For the convenience "--nic" parameter */
1496 static int net_param_nic(void *dummy, QemuOpts *opts, Error **errp)
1498 char *mac, *nd_id;
1499 int idx, ret;
1500 NICInfo *ni;
1501 const char *type;
1503 type = qemu_opt_get(opts, "type");
1504 if (type && g_str_equal(type, "none")) {
1505 return 0; /* Nothing to do, default_net is cleared in vl.c */
1508 idx = nic_get_free_idx();
1509 if (idx == -1 || nb_nics >= MAX_NICS) {
1510 error_setg(errp, "no more on-board/default NIC slots available");
1511 return -1;
1514 if (!type) {
1515 qemu_opt_set(opts, "type", "user", &error_abort);
1518 ni = &nd_table[idx];
1519 memset(ni, 0, sizeof(*ni));
1520 ni->model = qemu_opt_get_del(opts, "model");
1522 /* Create an ID if the user did not specify one */
1523 nd_id = g_strdup(qemu_opts_id(opts));
1524 if (!nd_id) {
1525 nd_id = g_strdup_printf("__org.qemu.nic%i\n", idx);
1526 qemu_opts_set_id(opts, nd_id);
1529 /* Handle MAC address */
1530 mac = qemu_opt_get_del(opts, "mac");
1531 if (mac) {
1532 ret = net_parse_macaddr(ni->macaddr.a, mac);
1533 g_free(mac);
1534 if (ret) {
1535 error_setg(errp, "invalid syntax for ethernet address");
1536 goto out;
1538 if (is_multicast_ether_addr(ni->macaddr.a)) {
1539 error_setg(errp, "NIC cannot have multicast MAC address");
1540 ret = -1;
1541 goto out;
1544 qemu_macaddr_default_if_unset(&ni->macaddr);
1546 ret = net_client_init(opts, true, errp);
1547 if (ret == 0) {
1548 ni->netdev = qemu_find_netdev(nd_id);
1549 ni->used = true;
1550 nb_nics++;
1553 out:
1554 g_free(nd_id);
1555 return ret;
1558 int net_init_clients(Error **errp)
1560 net_change_state_entry =
1561 qemu_add_vm_change_state_handler(net_vm_change_state_handler, NULL);
1563 QTAILQ_INIT(&net_clients);
1565 if (qemu_opts_foreach(qemu_find_opts("netdev"),
1566 net_init_netdev, NULL, errp)) {
1567 return -1;
1570 if (qemu_opts_foreach(qemu_find_opts("nic"), net_param_nic, NULL, errp)) {
1571 return -1;
1574 if (qemu_opts_foreach(qemu_find_opts("net"), net_init_client, NULL, errp)) {
1575 return -1;
1578 return 0;
1581 int net_client_parse(QemuOptsList *opts_list, const char *optarg)
1583 if (!qemu_opts_parse_noisily(opts_list, optarg, true)) {
1584 return -1;
1587 return 0;
1590 /* From FreeBSD */
1591 /* XXX: optimize */
1592 uint32_t net_crc32(const uint8_t *p, int len)
1594 uint32_t crc;
1595 int carry, i, j;
1596 uint8_t b;
1598 crc = 0xffffffff;
1599 for (i = 0; i < len; i++) {
1600 b = *p++;
1601 for (j = 0; j < 8; j++) {
1602 carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01);
1603 crc <<= 1;
1604 b >>= 1;
1605 if (carry) {
1606 crc = ((crc ^ POLYNOMIAL_BE) | carry);
1611 return crc;
1614 uint32_t net_crc32_le(const uint8_t *p, int len)
1616 uint32_t crc;
1617 int carry, i, j;
1618 uint8_t b;
1620 crc = 0xffffffff;
1621 for (i = 0; i < len; i++) {
1622 b = *p++;
1623 for (j = 0; j < 8; j++) {
1624 carry = (crc & 0x1) ^ (b & 0x01);
1625 crc >>= 1;
1626 b >>= 1;
1627 if (carry) {
1628 crc ^= POLYNOMIAL_LE;
1633 return crc;
1636 QemuOptsList qemu_netdev_opts = {
1637 .name = "netdev",
1638 .implied_opt_name = "type",
1639 .head = QTAILQ_HEAD_INITIALIZER(qemu_netdev_opts.head),
1640 .desc = {
1642 * no elements => accept any params
1643 * validation will happen later
1645 { /* end of list */ }
1649 QemuOptsList qemu_nic_opts = {
1650 .name = "nic",
1651 .implied_opt_name = "type",
1652 .head = QTAILQ_HEAD_INITIALIZER(qemu_nic_opts.head),
1653 .desc = {
1655 * no elements => accept any params
1656 * validation will happen later
1658 { /* end of list */ }
1662 QemuOptsList qemu_net_opts = {
1663 .name = "net",
1664 .implied_opt_name = "type",
1665 .head = QTAILQ_HEAD_INITIALIZER(qemu_net_opts.head),
1666 .desc = {
1668 * no elements => accept any params
1669 * validation will happen later
1671 { /* end of list */ }
1675 void net_socket_rs_init(SocketReadState *rs,
1676 SocketReadStateFinalize *finalize,
1677 bool vnet_hdr)
1679 rs->state = 0;
1680 rs->vnet_hdr = vnet_hdr;
1681 rs->index = 0;
1682 rs->packet_len = 0;
1683 rs->vnet_hdr_len = 0;
1684 memset(rs->buf, 0, sizeof(rs->buf));
1685 rs->finalize = finalize;
1689 * Returns
1690 * 0: success
1691 * -1: error occurs
1693 int net_fill_rstate(SocketReadState *rs, const uint8_t *buf, int size)
1695 unsigned int l;
1697 while (size > 0) {
1698 /* Reassemble a packet from the network.
1699 * 0 = getting length.
1700 * 1 = getting vnet header length.
1701 * 2 = getting data.
1703 switch (rs->state) {
1704 case 0:
1705 l = 4 - rs->index;
1706 if (l > size) {
1707 l = size;
1709 memcpy(rs->buf + rs->index, buf, l);
1710 buf += l;
1711 size -= l;
1712 rs->index += l;
1713 if (rs->index == 4) {
1714 /* got length */
1715 rs->packet_len = ntohl(*(uint32_t *)rs->buf);
1716 rs->index = 0;
1717 if (rs->vnet_hdr) {
1718 rs->state = 1;
1719 } else {
1720 rs->state = 2;
1721 rs->vnet_hdr_len = 0;
1724 break;
1725 case 1:
1726 l = 4 - rs->index;
1727 if (l > size) {
1728 l = size;
1730 memcpy(rs->buf + rs->index, buf, l);
1731 buf += l;
1732 size -= l;
1733 rs->index += l;
1734 if (rs->index == 4) {
1735 /* got vnet header length */
1736 rs->vnet_hdr_len = ntohl(*(uint32_t *)rs->buf);
1737 rs->index = 0;
1738 rs->state = 2;
1740 break;
1741 case 2:
1742 l = rs->packet_len - rs->index;
1743 if (l > size) {
1744 l = size;
1746 if (rs->index + l <= sizeof(rs->buf)) {
1747 memcpy(rs->buf + rs->index, buf, l);
1748 } else {
1749 fprintf(stderr, "serious error: oversized packet received,"
1750 "connection terminated.\n");
1751 rs->index = rs->state = 0;
1752 return -1;
1755 rs->index += l;
1756 buf += l;
1757 size -= l;
1758 if (rs->index >= rs->packet_len) {
1759 rs->index = 0;
1760 rs->state = 0;
1761 assert(rs->finalize);
1762 rs->finalize(rs);
1764 break;
1768 assert(size == 0);
1769 return 0;