fips: fix build on !Linux
[qemu-kvm.git] / net.c
blob60043ddec694ef914cd340d250163954d25976e4
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.
24 #include "net.h"
26 #include "config-host.h"
28 #include "net/tap.h"
29 #include "net/socket.h"
30 #include "net/dump.h"
31 #include "net/slirp.h"
32 #include "net/vde.h"
33 #include "net/hub.h"
34 #include "net/util.h"
35 #include "monitor.h"
36 #include "qemu-common.h"
37 #include "qemu_socket.h"
38 #include "qmp-commands.h"
39 #include "hw/qdev.h"
40 #include "iov.h"
41 #include "qapi-visit.h"
42 #include "qapi/opts-visitor.h"
43 #include "qapi/qapi-dealloc-visitor.h"
45 /* Net bridge is currently not supported for W32. */
46 #if !defined(_WIN32)
47 # define CONFIG_NET_BRIDGE
48 #endif
50 static QTAILQ_HEAD(, NetClientState) net_clients;
52 int default_net = 1;
54 /***********************************************************/
55 /* network device redirectors */
57 #if defined(DEBUG_NET)
58 static void hex_dump(FILE *f, const uint8_t *buf, int size)
60 int len, i, j, c;
62 for(i=0;i<size;i+=16) {
63 len = size - i;
64 if (len > 16)
65 len = 16;
66 fprintf(f, "%08x ", i);
67 for(j=0;j<16;j++) {
68 if (j < len)
69 fprintf(f, " %02x", buf[i+j]);
70 else
71 fprintf(f, " ");
73 fprintf(f, " ");
74 for(j=0;j<len;j++) {
75 c = buf[i+j];
76 if (c < ' ' || c > '~')
77 c = '.';
78 fprintf(f, "%c", c);
80 fprintf(f, "\n");
83 #endif
85 static int get_str_sep(char *buf, int buf_size, const char **pp, int sep)
87 const char *p, *p1;
88 int len;
89 p = *pp;
90 p1 = strchr(p, sep);
91 if (!p1)
92 return -1;
93 len = p1 - p;
94 p1++;
95 if (buf_size > 0) {
96 if (len > buf_size - 1)
97 len = buf_size - 1;
98 memcpy(buf, p, len);
99 buf[len] = '\0';
101 *pp = p1;
102 return 0;
105 int parse_host_port(struct sockaddr_in *saddr, const char *str)
107 char buf[512];
108 struct hostent *he;
109 const char *p, *r;
110 int port;
112 p = str;
113 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0)
114 return -1;
115 saddr->sin_family = AF_INET;
116 if (buf[0] == '\0') {
117 saddr->sin_addr.s_addr = 0;
118 } else {
119 if (qemu_isdigit(buf[0])) {
120 if (!inet_aton(buf, &saddr->sin_addr))
121 return -1;
122 } else {
123 if ((he = gethostbyname(buf)) == NULL)
124 return - 1;
125 saddr->sin_addr = *(struct in_addr *)he->h_addr;
128 port = strtol(p, (char **)&r, 0);
129 if (r == p)
130 return -1;
131 saddr->sin_port = htons(port);
132 return 0;
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 void qemu_macaddr_default_if_unset(MACAddr *macaddr)
146 static int index = 0;
147 static const MACAddr zero = { .a = { 0,0,0,0,0,0 } };
149 if (memcmp(macaddr, &zero, sizeof(zero)) != 0)
150 return;
151 macaddr->a[0] = 0x52;
152 macaddr->a[1] = 0x54;
153 macaddr->a[2] = 0x00;
154 macaddr->a[3] = 0x12;
155 macaddr->a[4] = 0x34;
156 macaddr->a[5] = 0x56 + index++;
160 * Generate a name for net client
162 * Only net clients created with the legacy -net option need this. Naming is
163 * mandatory for net clients created with -netdev.
165 static char *assign_name(NetClientState *nc1, const char *model)
167 NetClientState *nc;
168 char buf[256];
169 int id = 0;
171 QTAILQ_FOREACH(nc, &net_clients, next) {
172 if (nc == nc1) {
173 continue;
175 /* For compatibility only bump id for net clients on a vlan */
176 if (strcmp(nc->model, model) == 0 &&
177 net_hub_id_for_client(nc, NULL) == 0) {
178 id++;
182 snprintf(buf, sizeof(buf), "%s.%d", model, id);
184 return g_strdup(buf);
187 NetClientState *qemu_new_net_client(NetClientInfo *info,
188 NetClientState *peer,
189 const char *model,
190 const char *name)
192 NetClientState *nc;
194 assert(info->size >= sizeof(NetClientState));
196 nc = g_malloc0(info->size);
198 nc->info = info;
199 nc->model = g_strdup(model);
200 if (name) {
201 nc->name = g_strdup(name);
202 } else {
203 nc->name = assign_name(nc, model);
206 if (peer) {
207 assert(!peer->peer);
208 nc->peer = peer;
209 peer->peer = nc;
211 QTAILQ_INSERT_TAIL(&net_clients, nc, next);
213 nc->send_queue = qemu_new_net_queue(nc);
215 return nc;
218 NICState *qemu_new_nic(NetClientInfo *info,
219 NICConf *conf,
220 const char *model,
221 const char *name,
222 void *opaque)
224 NetClientState *nc;
225 NICState *nic;
227 assert(info->type == NET_CLIENT_OPTIONS_KIND_NIC);
228 assert(info->size >= sizeof(NICState));
230 nc = qemu_new_net_client(info, conf->peer, model, name);
232 nic = DO_UPCAST(NICState, nc, nc);
233 nic->conf = conf;
234 nic->opaque = opaque;
236 return nic;
239 static void qemu_cleanup_net_client(NetClientState *nc)
241 QTAILQ_REMOVE(&net_clients, nc, next);
243 if (nc->info->cleanup) {
244 nc->info->cleanup(nc);
248 static void qemu_free_net_client(NetClientState *nc)
250 if (nc->send_queue) {
251 qemu_del_net_queue(nc->send_queue);
253 if (nc->peer) {
254 nc->peer->peer = NULL;
256 g_free(nc->name);
257 g_free(nc->model);
258 g_free(nc);
261 void qemu_del_net_client(NetClientState *nc)
263 /* If there is a peer NIC, delete and cleanup client, but do not free. */
264 if (nc->peer && nc->peer->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
265 NICState *nic = DO_UPCAST(NICState, nc, nc->peer);
266 if (nic->peer_deleted) {
267 return;
269 nic->peer_deleted = true;
270 /* Let NIC know peer is gone. */
271 nc->peer->link_down = true;
272 if (nc->peer->info->link_status_changed) {
273 nc->peer->info->link_status_changed(nc->peer);
275 qemu_cleanup_net_client(nc);
276 return;
279 /* If this is a peer NIC and peer has already been deleted, free it now. */
280 if (nc->peer && nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
281 NICState *nic = DO_UPCAST(NICState, nc, nc);
282 if (nic->peer_deleted) {
283 qemu_free_net_client(nc->peer);
287 qemu_cleanup_net_client(nc);
288 qemu_free_net_client(nc);
291 void qemu_foreach_nic(qemu_nic_foreach func, void *opaque)
293 NetClientState *nc;
295 QTAILQ_FOREACH(nc, &net_clients, next) {
296 if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC) {
297 func(DO_UPCAST(NICState, nc, nc), opaque);
302 int qemu_can_send_packet(NetClientState *sender)
304 if (!sender->peer) {
305 return 1;
308 if (sender->peer->receive_disabled) {
309 return 0;
310 } else if (sender->peer->info->can_receive &&
311 !sender->peer->info->can_receive(sender->peer)) {
312 return 0;
314 return 1;
317 ssize_t qemu_deliver_packet(NetClientState *sender,
318 unsigned flags,
319 const uint8_t *data,
320 size_t size,
321 void *opaque)
323 NetClientState *nc = opaque;
324 ssize_t ret;
326 if (nc->link_down) {
327 return size;
330 if (nc->receive_disabled) {
331 return 0;
334 if (flags & QEMU_NET_PACKET_FLAG_RAW && nc->info->receive_raw) {
335 ret = nc->info->receive_raw(nc, data, size);
336 } else {
337 ret = nc->info->receive(nc, data, size);
340 if (ret == 0) {
341 nc->receive_disabled = 1;
344 return ret;
347 void qemu_purge_queued_packets(NetClientState *nc)
349 if (!nc->peer) {
350 return;
353 qemu_net_queue_purge(nc->peer->send_queue, nc);
356 void qemu_flush_queued_packets(NetClientState *nc)
358 nc->receive_disabled = 0;
360 qemu_net_queue_flush(nc->send_queue);
363 static ssize_t qemu_send_packet_async_with_flags(NetClientState *sender,
364 unsigned flags,
365 const uint8_t *buf, int size,
366 NetPacketSent *sent_cb)
368 NetQueue *queue;
370 #ifdef DEBUG_NET
371 printf("qemu_send_packet_async:\n");
372 hex_dump(stdout, buf, size);
373 #endif
375 if (sender->link_down || !sender->peer) {
376 return size;
379 queue = sender->peer->send_queue;
381 return qemu_net_queue_send(queue, sender, flags, buf, size, sent_cb);
384 ssize_t qemu_send_packet_async(NetClientState *sender,
385 const uint8_t *buf, int size,
386 NetPacketSent *sent_cb)
388 return qemu_send_packet_async_with_flags(sender, QEMU_NET_PACKET_FLAG_NONE,
389 buf, size, sent_cb);
392 void qemu_send_packet(NetClientState *nc, const uint8_t *buf, int size)
394 qemu_send_packet_async(nc, buf, size, NULL);
397 ssize_t qemu_send_packet_raw(NetClientState *nc, const uint8_t *buf, int size)
399 return qemu_send_packet_async_with_flags(nc, QEMU_NET_PACKET_FLAG_RAW,
400 buf, size, NULL);
403 static ssize_t nc_sendv_compat(NetClientState *nc, const struct iovec *iov,
404 int iovcnt)
406 uint8_t buffer[4096];
407 size_t offset;
409 offset = iov_to_buf(iov, iovcnt, 0, buffer, sizeof(buffer));
411 return nc->info->receive(nc, buffer, offset);
414 ssize_t qemu_deliver_packet_iov(NetClientState *sender,
415 unsigned flags,
416 const struct iovec *iov,
417 int iovcnt,
418 void *opaque)
420 NetClientState *nc = opaque;
422 if (nc->link_down) {
423 return iov_size(iov, iovcnt);
426 if (nc->info->receive_iov) {
427 return nc->info->receive_iov(nc, iov, iovcnt);
428 } else {
429 return nc_sendv_compat(nc, iov, iovcnt);
433 ssize_t qemu_sendv_packet_async(NetClientState *sender,
434 const struct iovec *iov, int iovcnt,
435 NetPacketSent *sent_cb)
437 NetQueue *queue;
439 if (sender->link_down || !sender->peer) {
440 return iov_size(iov, iovcnt);
443 queue = sender->peer->send_queue;
445 return qemu_net_queue_send_iov(queue, sender,
446 QEMU_NET_PACKET_FLAG_NONE,
447 iov, iovcnt, sent_cb);
450 ssize_t
451 qemu_sendv_packet(NetClientState *nc, const struct iovec *iov, int iovcnt)
453 return qemu_sendv_packet_async(nc, iov, iovcnt, NULL);
456 NetClientState *qemu_find_netdev(const char *id)
458 NetClientState *nc;
460 QTAILQ_FOREACH(nc, &net_clients, next) {
461 if (nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC)
462 continue;
463 if (!strcmp(nc->name, id)) {
464 return nc;
468 return NULL;
471 static int nic_get_free_idx(void)
473 int index;
475 for (index = 0; index < MAX_NICS; index++)
476 if (!nd_table[index].used)
477 return index;
478 return -1;
481 int qemu_show_nic_models(const char *arg, const char *const *models)
483 int i;
485 if (!arg || !is_help_option(arg)) {
486 return 0;
489 fprintf(stderr, "qemu: Supported NIC models: ");
490 for (i = 0 ; models[i]; i++)
491 fprintf(stderr, "%s%c", models[i], models[i+1] ? ',' : '\n');
492 return 1;
495 void qemu_check_nic_model(NICInfo *nd, const char *model)
497 const char *models[2];
499 models[0] = model;
500 models[1] = NULL;
502 if (qemu_show_nic_models(nd->model, models))
503 exit(0);
504 if (qemu_find_nic_model(nd, models, model) < 0)
505 exit(1);
508 int qemu_find_nic_model(NICInfo *nd, const char * const *models,
509 const char *default_model)
511 int i;
513 if (!nd->model)
514 nd->model = g_strdup(default_model);
516 for (i = 0 ; models[i]; i++) {
517 if (strcmp(nd->model, models[i]) == 0)
518 return i;
521 error_report("Unsupported NIC model: %s", nd->model);
522 return -1;
525 int net_handle_fd_param(Monitor *mon, const char *param)
527 int fd;
529 if (!qemu_isdigit(param[0]) && mon) {
531 fd = monitor_get_fd(mon, param);
532 if (fd == -1) {
533 error_report("No file descriptor named %s found", param);
534 return -1;
536 } else {
537 fd = qemu_parse_fd(param);
540 return fd;
543 static int net_init_nic(const NetClientOptions *opts, const char *name,
544 NetClientState *peer)
546 int idx;
547 NICInfo *nd;
548 const NetLegacyNicOptions *nic;
550 assert(opts->kind == NET_CLIENT_OPTIONS_KIND_NIC);
551 nic = opts->nic;
553 idx = nic_get_free_idx();
554 if (idx == -1 || nb_nics >= MAX_NICS) {
555 error_report("Too Many NICs");
556 return -1;
559 nd = &nd_table[idx];
561 memset(nd, 0, sizeof(*nd));
563 if (nic->has_netdev) {
564 nd->netdev = qemu_find_netdev(nic->netdev);
565 if (!nd->netdev) {
566 error_report("netdev '%s' not found", nic->netdev);
567 return -1;
569 } else {
570 assert(peer);
571 nd->netdev = peer;
573 if (name) {
574 nd->name = g_strdup(name);
576 if (nic->has_model) {
577 nd->model = g_strdup(nic->model);
579 if (nic->has_addr) {
580 nd->devaddr = g_strdup(nic->addr);
583 if (nic->has_macaddr &&
584 net_parse_macaddr(nd->macaddr.a, nic->macaddr) < 0) {
585 error_report("invalid syntax for ethernet address");
586 return -1;
588 qemu_macaddr_default_if_unset(&nd->macaddr);
590 if (nic->has_vectors) {
591 if (nic->vectors > 0x7ffffff) {
592 error_report("invalid # of vectors: %"PRIu32, nic->vectors);
593 return -1;
595 nd->nvectors = nic->vectors;
596 } else {
597 nd->nvectors = DEV_NVECTORS_UNSPECIFIED;
600 nd->used = 1;
601 nb_nics++;
603 return idx;
607 static int (* const net_client_init_fun[NET_CLIENT_OPTIONS_KIND_MAX])(
608 const NetClientOptions *opts,
609 const char *name,
610 NetClientState *peer) = {
611 [NET_CLIENT_OPTIONS_KIND_NIC] = net_init_nic,
612 #ifdef CONFIG_SLIRP
613 [NET_CLIENT_OPTIONS_KIND_USER] = net_init_slirp,
614 #endif
615 [NET_CLIENT_OPTIONS_KIND_TAP] = net_init_tap,
616 [NET_CLIENT_OPTIONS_KIND_SOCKET] = net_init_socket,
617 #ifdef CONFIG_VDE
618 [NET_CLIENT_OPTIONS_KIND_VDE] = net_init_vde,
619 #endif
620 [NET_CLIENT_OPTIONS_KIND_DUMP] = net_init_dump,
621 #ifdef CONFIG_NET_BRIDGE
622 [NET_CLIENT_OPTIONS_KIND_BRIDGE] = net_init_bridge,
623 #endif
624 [NET_CLIENT_OPTIONS_KIND_HUBPORT] = net_init_hubport,
628 static int net_client_init1(const void *object, int is_netdev, Error **errp)
630 union {
631 const Netdev *netdev;
632 const NetLegacy *net;
633 } u;
634 const NetClientOptions *opts;
635 const char *name;
637 if (is_netdev) {
638 u.netdev = object;
639 opts = u.netdev->opts;
640 name = u.netdev->id;
642 switch (opts->kind) {
643 #ifdef CONFIG_SLIRP
644 case NET_CLIENT_OPTIONS_KIND_USER:
645 #endif
646 case NET_CLIENT_OPTIONS_KIND_TAP:
647 case NET_CLIENT_OPTIONS_KIND_SOCKET:
648 #ifdef CONFIG_VDE
649 case NET_CLIENT_OPTIONS_KIND_VDE:
650 #endif
651 #ifdef CONFIG_NET_BRIDGE
652 case NET_CLIENT_OPTIONS_KIND_BRIDGE:
653 #endif
654 case NET_CLIENT_OPTIONS_KIND_HUBPORT:
655 break;
657 default:
658 error_set(errp, QERR_INVALID_PARAMETER_VALUE, "type",
659 "a netdev backend type");
660 return -1;
662 } else {
663 u.net = object;
664 opts = u.net->opts;
665 /* missing optional values have been initialized to "all bits zero" */
666 name = u.net->has_id ? u.net->id : u.net->name;
669 if (net_client_init_fun[opts->kind]) {
670 NetClientState *peer = NULL;
672 /* Do not add to a vlan if it's a -netdev or a nic with a netdev=
673 * parameter. */
674 if (!is_netdev &&
675 (opts->kind != NET_CLIENT_OPTIONS_KIND_NIC ||
676 !opts->nic->has_netdev)) {
677 peer = net_hub_add_port(u.net->has_vlan ? u.net->vlan : 0, NULL);
680 if (net_client_init_fun[opts->kind](opts, name, peer) < 0) {
681 /* TODO push error reporting into init() methods */
682 error_set(errp, QERR_DEVICE_INIT_FAILED,
683 NetClientOptionsKind_lookup[opts->kind]);
684 return -1;
687 return 0;
691 static void net_visit(Visitor *v, int is_netdev, void **object, Error **errp)
693 if (is_netdev) {
694 visit_type_Netdev(v, (Netdev **)object, NULL, errp);
695 } else {
696 visit_type_NetLegacy(v, (NetLegacy **)object, NULL, errp);
701 int net_client_init(QemuOpts *opts, int is_netdev, Error **errp)
703 void *object = NULL;
704 Error *err = NULL;
705 int ret = -1;
708 OptsVisitor *ov = opts_visitor_new(opts);
710 net_visit(opts_get_visitor(ov), is_netdev, &object, &err);
711 opts_visitor_cleanup(ov);
714 if (!err) {
715 ret = net_client_init1(object, is_netdev, &err);
718 if (object) {
719 QapiDeallocVisitor *dv = qapi_dealloc_visitor_new();
721 net_visit(qapi_dealloc_get_visitor(dv), is_netdev, &object, NULL);
722 qapi_dealloc_visitor_cleanup(dv);
725 error_propagate(errp, err);
726 return ret;
730 static int net_host_check_device(const char *device)
732 int i;
733 const char *valid_param_list[] = { "tap", "socket", "dump"
734 #ifdef CONFIG_NET_BRIDGE
735 , "bridge"
736 #endif
737 #ifdef CONFIG_SLIRP
738 ,"user"
739 #endif
740 #ifdef CONFIG_VDE
741 ,"vde"
742 #endif
744 for (i = 0; i < sizeof(valid_param_list) / sizeof(char *); i++) {
745 if (!strncmp(valid_param_list[i], device,
746 strlen(valid_param_list[i])))
747 return 1;
750 return 0;
753 void net_host_device_add(Monitor *mon, const QDict *qdict)
755 const char *device = qdict_get_str(qdict, "device");
756 const char *opts_str = qdict_get_try_str(qdict, "opts");
757 Error *local_err = NULL;
758 QemuOpts *opts;
760 if (!net_host_check_device(device)) {
761 monitor_printf(mon, "invalid host network device %s\n", device);
762 return;
765 opts = qemu_opts_parse(qemu_find_opts("net"), opts_str ? opts_str : "", 0);
766 if (!opts) {
767 return;
770 qemu_opt_set(opts, "type", device);
772 net_client_init(opts, 0, &local_err);
773 if (error_is_set(&local_err)) {
774 qerror_report_err(local_err);
775 error_free(local_err);
776 monitor_printf(mon, "adding host network device %s failed\n", device);
780 void net_host_device_remove(Monitor *mon, const QDict *qdict)
782 NetClientState *nc;
783 int vlan_id = qdict_get_int(qdict, "vlan_id");
784 const char *device = qdict_get_str(qdict, "device");
786 nc = net_hub_find_client_by_name(vlan_id, device);
787 if (!nc) {
788 return;
790 if (!net_host_check_device(nc->model)) {
791 monitor_printf(mon, "invalid host network device %s\n", device);
792 return;
794 qemu_del_net_client(nc);
797 void netdev_add(QemuOpts *opts, Error **errp)
799 net_client_init(opts, 1, errp);
802 int qmp_netdev_add(Monitor *mon, const QDict *qdict, QObject **ret)
804 Error *local_err = NULL;
805 QemuOptsList *opts_list;
806 QemuOpts *opts;
808 opts_list = qemu_find_opts_err("netdev", &local_err);
809 if (error_is_set(&local_err)) {
810 goto exit_err;
813 opts = qemu_opts_from_qdict(opts_list, qdict, &local_err);
814 if (error_is_set(&local_err)) {
815 goto exit_err;
818 netdev_add(opts, &local_err);
819 if (error_is_set(&local_err)) {
820 qemu_opts_del(opts);
821 goto exit_err;
824 return 0;
826 exit_err:
827 qerror_report_err(local_err);
828 error_free(local_err);
829 return -1;
832 void qmp_netdev_del(const char *id, Error **errp)
834 NetClientState *nc;
836 nc = qemu_find_netdev(id);
837 if (!nc) {
838 error_set(errp, QERR_DEVICE_NOT_FOUND, id);
839 return;
842 qemu_del_net_client(nc);
843 qemu_opts_del(qemu_opts_find(qemu_find_opts_err("netdev", errp), id));
846 void print_net_client(Monitor *mon, NetClientState *nc)
848 monitor_printf(mon, "%s: type=%s,%s\n", nc->name,
849 NetClientOptionsKind_lookup[nc->info->type], nc->info_str);
852 void do_info_network(Monitor *mon)
854 NetClientState *nc, *peer;
855 NetClientOptionsKind type;
857 net_hub_info(mon);
859 QTAILQ_FOREACH(nc, &net_clients, next) {
860 peer = nc->peer;
861 type = nc->info->type;
863 /* Skip if already printed in hub info */
864 if (net_hub_id_for_client(nc, NULL) == 0) {
865 continue;
868 if (!peer || type == NET_CLIENT_OPTIONS_KIND_NIC) {
869 print_net_client(mon, nc);
870 } /* else it's a netdev connected to a NIC, printed with the NIC */
871 if (peer && type == NET_CLIENT_OPTIONS_KIND_NIC) {
872 monitor_printf(mon, " \\ ");
873 print_net_client(mon, peer);
878 void qmp_set_link(const char *name, bool up, Error **errp)
880 NetClientState *nc = NULL;
882 QTAILQ_FOREACH(nc, &net_clients, next) {
883 if (!strcmp(nc->name, name)) {
884 goto done;
887 done:
888 if (!nc) {
889 error_set(errp, QERR_DEVICE_NOT_FOUND, name);
890 return;
893 nc->link_down = !up;
895 if (nc->info->link_status_changed) {
896 nc->info->link_status_changed(nc);
899 /* Notify peer. Don't update peer link status: this makes it possible to
900 * disconnect from host network without notifying the guest.
901 * FIXME: is disconnected link status change operation useful?
903 * Current behaviour is compatible with qemu vlans where there could be
904 * multiple clients that can still communicate with each other in
905 * disconnected mode. For now maintain this compatibility. */
906 if (nc->peer && nc->peer->info->link_status_changed) {
907 nc->peer->info->link_status_changed(nc->peer);
911 void net_cleanup(void)
913 NetClientState *nc, *next_vc;
915 QTAILQ_FOREACH_SAFE(nc, &net_clients, next, next_vc) {
916 qemu_del_net_client(nc);
920 void net_check_clients(void)
922 NetClientState *nc;
923 int i;
925 /* Don't warn about the default network setup that you get if
926 * no command line -net or -netdev options are specified. There
927 * are two cases that we would otherwise complain about:
928 * (1) board doesn't support a NIC but the implicit "-net nic"
929 * requested one
930 * (2) CONFIG_SLIRP not set, in which case the implicit "-net nic"
931 * sets up a nic that isn't connected to anything.
933 if (default_net) {
934 return;
937 net_hub_check_clients();
939 QTAILQ_FOREACH(nc, &net_clients, next) {
940 if (!nc->peer) {
941 fprintf(stderr, "Warning: %s %s has no peer\n",
942 nc->info->type == NET_CLIENT_OPTIONS_KIND_NIC ?
943 "nic" : "netdev", nc->name);
947 /* Check that all NICs requested via -net nic actually got created.
948 * NICs created via -device don't need to be checked here because
949 * they are always instantiated.
951 for (i = 0; i < MAX_NICS; i++) {
952 NICInfo *nd = &nd_table[i];
953 if (nd->used && !nd->instantiated) {
954 fprintf(stderr, "Warning: requested NIC (%s, model %s) "
955 "was not created (not supported by this machine?)\n",
956 nd->name ? nd->name : "anonymous",
957 nd->model ? nd->model : "unspecified");
962 static int net_init_client(QemuOpts *opts, void *dummy)
964 Error *local_err = NULL;
966 net_client_init(opts, 0, &local_err);
967 if (error_is_set(&local_err)) {
968 qerror_report_err(local_err);
969 error_free(local_err);
970 return -1;
973 return 0;
976 static int net_init_netdev(QemuOpts *opts, void *dummy)
978 Error *local_err = NULL;
979 int ret;
981 ret = net_client_init(opts, 1, &local_err);
982 if (error_is_set(&local_err)) {
983 qerror_report_err(local_err);
984 error_free(local_err);
985 return -1;
988 return ret;
991 int net_init_clients(void)
993 QemuOptsList *net = qemu_find_opts("net");
995 if (default_net) {
996 /* if no clients, we use a default config */
997 qemu_opts_set(net, NULL, "type", "nic");
998 #ifdef CONFIG_SLIRP
999 qemu_opts_set(net, NULL, "type", "user");
1000 #endif
1003 QTAILQ_INIT(&net_clients);
1005 if (qemu_opts_foreach(qemu_find_opts("netdev"), net_init_netdev, NULL, 1) == -1)
1006 return -1;
1008 if (qemu_opts_foreach(net, net_init_client, NULL, 1) == -1) {
1009 return -1;
1012 return 0;
1015 int net_client_parse(QemuOptsList *opts_list, const char *optarg)
1017 #if defined(CONFIG_SLIRP)
1018 int ret;
1019 if (net_slirp_parse_legacy(opts_list, optarg, &ret)) {
1020 return ret;
1022 #endif
1024 if (!qemu_opts_parse(opts_list, optarg, 1)) {
1025 return -1;
1028 default_net = 0;
1029 return 0;
1032 /* From FreeBSD */
1033 /* XXX: optimize */
1034 unsigned compute_mcast_idx(const uint8_t *ep)
1036 uint32_t crc;
1037 int carry, i, j;
1038 uint8_t b;
1040 crc = 0xffffffff;
1041 for (i = 0; i < 6; i++) {
1042 b = *ep++;
1043 for (j = 0; j < 8; j++) {
1044 carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01);
1045 crc <<= 1;
1046 b >>= 1;
1047 if (carry) {
1048 crc = ((crc ^ POLYNOMIAL) | carry);
1052 return crc >> 26;