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26#include "qemu/osdep.h"
27#include "tap_int.h"
28
29
30#include <sys/ioctl.h>
31#include <sys/wait.h>
32#include <sys/socket.h>
33#include <net/if.h>
34
35#include "net/net.h"
36#include "clients.h"
37#include "monitor/monitor.h"
38#include "sysemu/sysemu.h"
39#include "qapi/error.h"
40#include "qemu-common.h"
41#include "qemu/cutils.h"
42#include "qemu/error-report.h"
43#include "qemu/sockets.h"
44
45#include "net/tap.h"
46
47#include "net/vhost_net.h"
48
49typedef struct TAPState {
50 NetClientState nc;
51 int fd;
52 char down_script[1024];
53 char down_script_arg[128];
54 uint8_t buf[NET_BUFSIZE];
55 bool read_poll;
56 bool write_poll;
57 bool using_vnet_hdr;
58 bool has_ufo;
59 bool enabled;
60 VHostNetState *vhost_net;
61 unsigned host_vnet_hdr_len;
62 Notifier exit;
63} TAPState;
64
65static void launch_script(const char *setup_script, const char *ifname,
66 int fd, Error **errp);
67
68static void tap_send(void *opaque);
69static void tap_writable(void *opaque);
70
71static void tap_update_fd_handler(TAPState *s)
72{
73 qemu_set_fd_handler(s->fd,
74 s->read_poll && s->enabled ? tap_send : NULL,
75 s->write_poll && s->enabled ? tap_writable : NULL,
76 s);
77}
78
79static void tap_read_poll(TAPState *s, bool enable)
80{
81 s->read_poll = enable;
82 tap_update_fd_handler(s);
83}
84
85static void tap_write_poll(TAPState *s, bool enable)
86{
87 s->write_poll = enable;
88 tap_update_fd_handler(s);
89}
90
91static void tap_writable(void *opaque)
92{
93 TAPState *s = opaque;
94
95 tap_write_poll(s, false);
96
97 qemu_flush_queued_packets(&s->nc);
98}
99
100static ssize_t tap_write_packet(TAPState *s, const struct iovec *iov, int iovcnt)
101{
102 ssize_t len;
103
104 do {
105 len = writev(s->fd, iov, iovcnt);
106 } while (len == -1 && errno == EINTR);
107
108 if (len == -1 && errno == EAGAIN) {
109 tap_write_poll(s, true);
110 return 0;
111 }
112
113 return len;
114}
115
116static ssize_t tap_receive_iov(NetClientState *nc, const struct iovec *iov,
117 int iovcnt)
118{
119 TAPState *s = DO_UPCAST(TAPState, nc, nc);
120 const struct iovec *iovp = iov;
121 struct iovec iov_copy[iovcnt + 1];
122 struct virtio_net_hdr_mrg_rxbuf hdr = { };
123
124 if (s->host_vnet_hdr_len && !s->using_vnet_hdr) {
125 iov_copy[0].iov_base = &hdr;
126 iov_copy[0].iov_len = s->host_vnet_hdr_len;
127 memcpy(&iov_copy[1], iov, iovcnt * sizeof(*iov));
128 iovp = iov_copy;
129 iovcnt++;
130 }
131
132 return tap_write_packet(s, iovp, iovcnt);
133}
134
135static ssize_t tap_receive_raw(NetClientState *nc, const uint8_t *buf, size_t size)
136{
137 TAPState *s = DO_UPCAST(TAPState, nc, nc);
138 struct iovec iov[2];
139 int iovcnt = 0;
140 struct virtio_net_hdr_mrg_rxbuf hdr = { };
141
142 if (s->host_vnet_hdr_len) {
143 iov[iovcnt].iov_base = &hdr;
144 iov[iovcnt].iov_len = s->host_vnet_hdr_len;
145 iovcnt++;
146 }
147
148 iov[iovcnt].iov_base = (char *)buf;
149 iov[iovcnt].iov_len = size;
150 iovcnt++;
151
152 return tap_write_packet(s, iov, iovcnt);
153}
154
155static ssize_t tap_receive(NetClientState *nc, const uint8_t *buf, size_t size)
156{
157 TAPState *s = DO_UPCAST(TAPState, nc, nc);
158 struct iovec iov[1];
159
160 if (s->host_vnet_hdr_len && !s->using_vnet_hdr) {
161 return tap_receive_raw(nc, buf, size);
162 }
163
164 iov[0].iov_base = (char *)buf;
165 iov[0].iov_len = size;
166
167 return tap_write_packet(s, iov, 1);
168}
169
170#ifndef __sun__
171ssize_t tap_read_packet(int tapfd, uint8_t *buf, int maxlen)
172{
173 return read(tapfd, buf, maxlen);
174}
175#endif
176
177static void tap_send_completed(NetClientState *nc, ssize_t len)
178{
179 TAPState *s = DO_UPCAST(TAPState, nc, nc);
180 tap_read_poll(s, true);
181}
182
183static void tap_send(void *opaque)
184{
185 TAPState *s = opaque;
186 int size;
187 int packets = 0;
188
189 while (true) {
190 uint8_t *buf = s->buf;
191
192 size = tap_read_packet(s->fd, s->buf, sizeof(s->buf));
193 if (size <= 0) {
194 break;
195 }
196
197 if (s->host_vnet_hdr_len && !s->using_vnet_hdr) {
198 buf += s->host_vnet_hdr_len;
199 size -= s->host_vnet_hdr_len;
200 }
201
202 size = qemu_send_packet_async(&s->nc, buf, size, tap_send_completed);
203 if (size == 0) {
204 tap_read_poll(s, false);
205 break;
206 } else if (size < 0) {
207 break;
208 }
209
210
211
212
213
214
215
216 packets++;
217 if (packets >= 50) {
218 break;
219 }
220 }
221}
222
223static bool tap_has_ufo(NetClientState *nc)
224{
225 TAPState *s = DO_UPCAST(TAPState, nc, nc);
226
227 assert(nc->info->type == NET_CLIENT_DRIVER_TAP);
228
229 return s->has_ufo;
230}
231
232static bool tap_has_vnet_hdr(NetClientState *nc)
233{
234 TAPState *s = DO_UPCAST(TAPState, nc, nc);
235
236 assert(nc->info->type == NET_CLIENT_DRIVER_TAP);
237
238 return !!s->host_vnet_hdr_len;
239}
240
241static bool tap_has_vnet_hdr_len(NetClientState *nc, int len)
242{
243 TAPState *s = DO_UPCAST(TAPState, nc, nc);
244
245 assert(nc->info->type == NET_CLIENT_DRIVER_TAP);
246
247 return !!tap_probe_vnet_hdr_len(s->fd, len);
248}
249
250static void tap_set_vnet_hdr_len(NetClientState *nc, int len)
251{
252 TAPState *s = DO_UPCAST(TAPState, nc, nc);
253
254 assert(nc->info->type == NET_CLIENT_DRIVER_TAP);
255 assert(len == sizeof(struct virtio_net_hdr_mrg_rxbuf) ||
256 len == sizeof(struct virtio_net_hdr));
257
258 tap_fd_set_vnet_hdr_len(s->fd, len);
259 s->host_vnet_hdr_len = len;
260}
261
262static void tap_using_vnet_hdr(NetClientState *nc, bool using_vnet_hdr)
263{
264 TAPState *s = DO_UPCAST(TAPState, nc, nc);
265
266 assert(nc->info->type == NET_CLIENT_DRIVER_TAP);
267 assert(!!s->host_vnet_hdr_len == using_vnet_hdr);
268
269 s->using_vnet_hdr = using_vnet_hdr;
270}
271
272static int tap_set_vnet_le(NetClientState *nc, bool is_le)
273{
274 TAPState *s = DO_UPCAST(TAPState, nc, nc);
275
276 return tap_fd_set_vnet_le(s->fd, is_le);
277}
278
279static int tap_set_vnet_be(NetClientState *nc, bool is_be)
280{
281 TAPState *s = DO_UPCAST(TAPState, nc, nc);
282
283 return tap_fd_set_vnet_be(s->fd, is_be);
284}
285
286static void tap_set_offload(NetClientState *nc, int csum, int tso4,
287 int tso6, int ecn, int ufo)
288{
289 TAPState *s = DO_UPCAST(TAPState, nc, nc);
290 if (s->fd < 0) {
291 return;
292 }
293
294 tap_fd_set_offload(s->fd, csum, tso4, tso6, ecn, ufo);
295}
296
297static void tap_exit_notify(Notifier *notifier, void *data)
298{
299 TAPState *s = container_of(notifier, TAPState, exit);
300 Error *err = NULL;
301
302 if (s->down_script[0]) {
303 launch_script(s->down_script, s->down_script_arg, s->fd, &err);
304 if (err) {
305 error_report_err(err);
306 }
307 }
308}
309
310static void tap_cleanup(NetClientState *nc)
311{
312 TAPState *s = DO_UPCAST(TAPState, nc, nc);
313
314 if (s->vhost_net) {
315 vhost_net_cleanup(s->vhost_net);
316 g_free(s->vhost_net);
317 s->vhost_net = NULL;
318 }
319
320 qemu_purge_queued_packets(nc);
321
322 tap_exit_notify(&s->exit, NULL);
323 qemu_remove_exit_notifier(&s->exit);
324
325 tap_read_poll(s, false);
326 tap_write_poll(s, false);
327 close(s->fd);
328 s->fd = -1;
329}
330
331static void tap_poll(NetClientState *nc, bool enable)
332{
333 TAPState *s = DO_UPCAST(TAPState, nc, nc);
334 tap_read_poll(s, enable);
335 tap_write_poll(s, enable);
336}
337
338int tap_get_fd(NetClientState *nc)
339{
340 TAPState *s = DO_UPCAST(TAPState, nc, nc);
341 assert(nc->info->type == NET_CLIENT_DRIVER_TAP);
342 return s->fd;
343}
344
345
346
347static NetClientInfo net_tap_info = {
348 .type = NET_CLIENT_DRIVER_TAP,
349 .size = sizeof(TAPState),
350 .receive = tap_receive,
351 .receive_raw = tap_receive_raw,
352 .receive_iov = tap_receive_iov,
353 .poll = tap_poll,
354 .cleanup = tap_cleanup,
355 .has_ufo = tap_has_ufo,
356 .has_vnet_hdr = tap_has_vnet_hdr,
357 .has_vnet_hdr_len = tap_has_vnet_hdr_len,
358 .using_vnet_hdr = tap_using_vnet_hdr,
359 .set_offload = tap_set_offload,
360 .set_vnet_hdr_len = tap_set_vnet_hdr_len,
361 .set_vnet_le = tap_set_vnet_le,
362 .set_vnet_be = tap_set_vnet_be,
363};
364
365static TAPState *net_tap_fd_init(NetClientState *peer,
366 const char *model,
367 const char *name,
368 int fd,
369 int vnet_hdr)
370{
371 NetClientState *nc;
372 TAPState *s;
373
374 nc = qemu_new_net_client(&net_tap_info, peer, model, name);
375
376 s = DO_UPCAST(TAPState, nc, nc);
377
378 s->fd = fd;
379 s->host_vnet_hdr_len = vnet_hdr ? sizeof(struct virtio_net_hdr) : 0;
380 s->using_vnet_hdr = false;
381 s->has_ufo = tap_probe_has_ufo(s->fd);
382 s->enabled = true;
383 tap_set_offload(&s->nc, 0, 0, 0, 0, 0);
384
385
386
387
388 if (tap_probe_vnet_hdr_len(s->fd, s->host_vnet_hdr_len)) {
389 tap_fd_set_vnet_hdr_len(s->fd, s->host_vnet_hdr_len);
390 }
391 tap_read_poll(s, true);
392 s->vhost_net = NULL;
393
394 s->exit.notify = tap_exit_notify;
395 qemu_add_exit_notifier(&s->exit);
396
397 return s;
398}
399
400static void launch_script(const char *setup_script, const char *ifname,
401 int fd, Error **errp)
402{
403 int pid, status;
404 char *args[3];
405 char **parg;
406
407
408 pid = fork();
409 if (pid < 0) {
410 error_setg_errno(errp, errno, "could not launch network script %s",
411 setup_script);
412 return;
413 }
414 if (pid == 0) {
415 int open_max = sysconf(_SC_OPEN_MAX), i;
416
417 for (i = 3; i < open_max; i++) {
418 if (i != fd) {
419 close(i);
420 }
421 }
422 parg = args;
423 *parg++ = (char *)setup_script;
424 *parg++ = (char *)ifname;
425 *parg = NULL;
426 execv(setup_script, args);
427 _exit(1);
428 } else {
429 while (waitpid(pid, &status, 0) != pid) {
430
431 }
432
433 if (WIFEXITED(status) && WEXITSTATUS(status) == 0) {
434 return;
435 }
436 error_setg(errp, "network script %s failed with status %d",
437 setup_script, status);
438 }
439}
440
441static int recv_fd(int c)
442{
443 int fd;
444 uint8_t msgbuf[CMSG_SPACE(sizeof(fd))];
445 struct msghdr msg = {
446 .msg_control = msgbuf,
447 .msg_controllen = sizeof(msgbuf),
448 };
449 struct cmsghdr *cmsg;
450 struct iovec iov;
451 uint8_t req[1];
452 ssize_t len;
453
454 cmsg = CMSG_FIRSTHDR(&msg);
455 cmsg->cmsg_level = SOL_SOCKET;
456 cmsg->cmsg_type = SCM_RIGHTS;
457 cmsg->cmsg_len = CMSG_LEN(sizeof(fd));
458 msg.msg_controllen = cmsg->cmsg_len;
459
460 iov.iov_base = req;
461 iov.iov_len = sizeof(req);
462
463 msg.msg_iov = &iov;
464 msg.msg_iovlen = 1;
465
466 len = recvmsg(c, &msg, 0);
467 if (len > 0) {
468 memcpy(&fd, CMSG_DATA(cmsg), sizeof(fd));
469 return fd;
470 }
471
472 return len;
473}
474
475static int net_bridge_run_helper(const char *helper, const char *bridge,
476 Error **errp)
477{
478 sigset_t oldmask, mask;
479 int pid, status;
480 char *args[5];
481 char **parg;
482 int sv[2];
483
484 sigemptyset(&mask);
485 sigaddset(&mask, SIGCHLD);
486 sigprocmask(SIG_BLOCK, &mask, &oldmask);
487
488 if (socketpair(PF_UNIX, SOCK_STREAM, 0, sv) == -1) {
489 error_setg_errno(errp, errno, "socketpair() failed");
490 return -1;
491 }
492
493
494 pid = fork();
495 if (pid < 0) {
496 error_setg_errno(errp, errno, "Can't fork bridge helper");
497 return -1;
498 }
499 if (pid == 0) {
500 int open_max = sysconf(_SC_OPEN_MAX), i;
501 char *fd_buf = NULL;
502 char *br_buf = NULL;
503 char *helper_cmd = NULL;
504
505 for (i = 3; i < open_max; i++) {
506 if (i != sv[1]) {
507 close(i);
508 }
509 }
510
511 fd_buf = g_strdup_printf("%s%d", "--fd=", sv[1]);
512
513 if (strrchr(helper, ' ') || strrchr(helper, '\t')) {
514
515
516 if (strstr(helper, "--br=") == NULL) {
517 br_buf = g_strdup_printf("%s%s", "--br=", bridge);
518 }
519
520 helper_cmd = g_strdup_printf("%s %s %s %s", helper,
521 "--use-vnet", fd_buf, br_buf ? br_buf : "");
522
523 parg = args;
524 *parg++ = (char *)"sh";
525 *parg++ = (char *)"-c";
526 *parg++ = helper_cmd;
527 *parg++ = NULL;
528
529 execv("/bin/sh", args);
530 g_free(helper_cmd);
531 } else {
532
533
534 br_buf = g_strdup_printf("%s%s", "--br=", bridge);
535
536 parg = args;
537 *parg++ = (char *)helper;
538 *parg++ = (char *)"--use-vnet";
539 *parg++ = fd_buf;
540 *parg++ = br_buf;
541 *parg++ = NULL;
542
543 execv(helper, args);
544 }
545 g_free(fd_buf);
546 g_free(br_buf);
547 _exit(1);
548
549 } else {
550 int fd;
551 int saved_errno;
552
553 close(sv[1]);
554
555 do {
556 fd = recv_fd(sv[0]);
557 } while (fd == -1 && errno == EINTR);
558 saved_errno = errno;
559
560 close(sv[0]);
561
562 while (waitpid(pid, &status, 0) != pid) {
563
564 }
565 sigprocmask(SIG_SETMASK, &oldmask, NULL);
566 if (fd < 0) {
567 error_setg_errno(errp, saved_errno,
568 "failed to recv file descriptor");
569 return -1;
570 }
571 if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
572 error_setg(errp, "bridge helper failed");
573 return -1;
574 }
575 return fd;
576 }
577}
578
579int net_init_bridge(const Netdev *netdev, const char *name,
580 NetClientState *peer, Error **errp)
581{
582 const NetdevBridgeOptions *bridge;
583 const char *helper, *br;
584 TAPState *s;
585 int fd, vnet_hdr;
586
587 assert(netdev->type == NET_CLIENT_DRIVER_BRIDGE);
588 bridge = &netdev->u.bridge;
589
590 helper = bridge->has_helper ? bridge->helper : DEFAULT_BRIDGE_HELPER;
591 br = bridge->has_br ? bridge->br : DEFAULT_BRIDGE_INTERFACE;
592
593 fd = net_bridge_run_helper(helper, br, errp);
594 if (fd == -1) {
595 return -1;
596 }
597
598 qemu_set_nonblock(fd);
599 vnet_hdr = tap_probe_vnet_hdr(fd);
600 s = net_tap_fd_init(peer, "bridge", name, fd, vnet_hdr);
601
602 snprintf(s->nc.info_str, sizeof(s->nc.info_str), "helper=%s,br=%s", helper,
603 br);
604
605 return 0;
606}
607
608static int net_tap_init(const NetdevTapOptions *tap, int *vnet_hdr,
609 const char *setup_script, char *ifname,
610 size_t ifname_sz, int mq_required, Error **errp)
611{
612 Error *err = NULL;
613 int fd, vnet_hdr_required;
614
615 if (tap->has_vnet_hdr) {
616 *vnet_hdr = tap->vnet_hdr;
617 vnet_hdr_required = *vnet_hdr;
618 } else {
619 *vnet_hdr = 1;
620 vnet_hdr_required = 0;
621 }
622
623 TFR(fd = tap_open(ifname, ifname_sz, vnet_hdr, vnet_hdr_required,
624 mq_required, errp));
625 if (fd < 0) {
626 return -1;
627 }
628
629 if (setup_script &&
630 setup_script[0] != '\0' &&
631 strcmp(setup_script, "no") != 0) {
632 launch_script(setup_script, ifname, fd, &err);
633 if (err) {
634 error_propagate(errp, err);
635 close(fd);
636 return -1;
637 }
638 }
639
640 return fd;
641}
642
643#define MAX_TAP_QUEUES 1024
644
645static void net_init_tap_one(const NetdevTapOptions *tap, NetClientState *peer,
646 const char *model, const char *name,
647 const char *ifname, const char *script,
648 const char *downscript, const char *vhostfdname,
649 int vnet_hdr, int fd, Error **errp)
650{
651 Error *err = NULL;
652 TAPState *s = net_tap_fd_init(peer, model, name, fd, vnet_hdr);
653 int vhostfd;
654
655 tap_set_sndbuf(s->fd, tap, &err);
656 if (err) {
657 error_propagate(errp, err);
658 return;
659 }
660
661 if (tap->has_fd || tap->has_fds) {
662 snprintf(s->nc.info_str, sizeof(s->nc.info_str), "fd=%d", fd);
663 } else if (tap->has_helper) {
664 snprintf(s->nc.info_str, sizeof(s->nc.info_str), "helper=%s",
665 tap->helper);
666 } else {
667 snprintf(s->nc.info_str, sizeof(s->nc.info_str),
668 "ifname=%s,script=%s,downscript=%s", ifname, script,
669 downscript);
670
671 if (strcmp(downscript, "no") != 0) {
672 snprintf(s->down_script, sizeof(s->down_script), "%s", downscript);
673 snprintf(s->down_script_arg, sizeof(s->down_script_arg),
674 "%s", ifname);
675 }
676 }
677
678 if (tap->has_vhost ? tap->vhost :
679 vhostfdname || (tap->has_vhostforce && tap->vhostforce)) {
680 VhostNetOptions options;
681
682 options.backend_type = VHOST_BACKEND_TYPE_KERNEL;
683 options.net_backend = &s->nc;
684 if (tap->has_poll_us) {
685 options.busyloop_timeout = tap->poll_us;
686 } else {
687 options.busyloop_timeout = 0;
688 }
689
690 if (vhostfdname) {
691 vhostfd = monitor_fd_param(cur_mon, vhostfdname, &err);
692 if (vhostfd == -1) {
693 if (tap->has_vhostforce && tap->vhostforce) {
694 error_propagate(errp, err);
695 } else {
696 warn_report_err(err);
697 }
698 return;
699 }
700 qemu_set_nonblock(vhostfd);
701 } else {
702 vhostfd = open("/dev/vhost-net", O_RDWR);
703 if (vhostfd < 0) {
704 if (tap->has_vhostforce && tap->vhostforce) {
705 error_setg_errno(errp, errno,
706 "tap: open vhost char device failed");
707 } else {
708 warn_report("tap: open vhost char device failed: %s",
709 strerror(errno));
710 }
711 return;
712 }
713 qemu_set_nonblock(vhostfd);
714 }
715 options.opaque = (void *)(uintptr_t)vhostfd;
716
717 s->vhost_net = vhost_net_init(&options);
718 if (!s->vhost_net) {
719 if (tap->has_vhostforce && tap->vhostforce) {
720 error_setg(errp, VHOST_NET_INIT_FAILED);
721 } else {
722 warn_report(VHOST_NET_INIT_FAILED);
723 }
724 return;
725 }
726 } else if (vhostfdname) {
727 error_setg(errp, "vhostfd(s)= is not valid without vhost");
728 }
729}
730
731static int get_fds(char *str, char *fds[], int max)
732{
733 char *ptr = str, *this;
734 size_t len = strlen(str);
735 int i = 0;
736
737 while (i < max && ptr < str + len) {
738 this = strchr(ptr, ':');
739
740 if (this == NULL) {
741 fds[i] = g_strdup(ptr);
742 } else {
743 fds[i] = g_strndup(ptr, this - ptr);
744 }
745
746 i++;
747 if (this == NULL) {
748 break;
749 } else {
750 ptr = this + 1;
751 }
752 }
753
754 return i;
755}
756
757int net_init_tap(const Netdev *netdev, const char *name,
758 NetClientState *peer, Error **errp)
759{
760 const NetdevTapOptions *tap;
761 int fd, vnet_hdr = 0, i = 0, queues;
762
763 const char *script = NULL;
764 const char *downscript = NULL;
765 Error *err = NULL;
766 const char *vhostfdname;
767 char ifname[128];
768
769 assert(netdev->type == NET_CLIENT_DRIVER_TAP);
770 tap = &netdev->u.tap;
771 queues = tap->has_queues ? tap->queues : 1;
772 vhostfdname = tap->has_vhostfd ? tap->vhostfd : NULL;
773
774
775
776 if (peer && (tap->has_queues || tap->has_fds || tap->has_vhostfds)) {
777 error_setg(errp, "Multiqueue tap cannot be used with hubs");
778 return -1;
779 }
780
781 if (tap->has_fd) {
782 if (tap->has_ifname || tap->has_script || tap->has_downscript ||
783 tap->has_vnet_hdr || tap->has_helper || tap->has_queues ||
784 tap->has_fds || tap->has_vhostfds) {
785 error_setg(errp, "ifname=, script=, downscript=, vnet_hdr=, "
786 "helper=, queues=, fds=, and vhostfds= "
787 "are invalid with fd=");
788 return -1;
789 }
790
791 fd = monitor_fd_param(cur_mon, tap->fd, &err);
792 if (fd == -1) {
793 error_propagate(errp, err);
794 return -1;
795 }
796
797 qemu_set_nonblock(fd);
798
799 vnet_hdr = tap_probe_vnet_hdr(fd);
800
801 net_init_tap_one(tap, peer, "tap", name, NULL,
802 script, downscript,
803 vhostfdname, vnet_hdr, fd, &err);
804 if (err) {
805 error_propagate(errp, err);
806 return -1;
807 }
808 } else if (tap->has_fds) {
809 char **fds;
810 char **vhost_fds;
811 int nfds = 0, nvhosts = 0;
812 int ret = 0;
813
814 if (tap->has_ifname || tap->has_script || tap->has_downscript ||
815 tap->has_vnet_hdr || tap->has_helper || tap->has_queues ||
816 tap->has_vhostfd) {
817 error_setg(errp, "ifname=, script=, downscript=, vnet_hdr=, "
818 "helper=, queues=, and vhostfd= "
819 "are invalid with fds=");
820 return -1;
821 }
822
823 fds = g_new0(char *, MAX_TAP_QUEUES);
824 vhost_fds = g_new0(char *, MAX_TAP_QUEUES);
825
826 nfds = get_fds(tap->fds, fds, MAX_TAP_QUEUES);
827 if (tap->has_vhostfds) {
828 nvhosts = get_fds(tap->vhostfds, vhost_fds, MAX_TAP_QUEUES);
829 if (nfds != nvhosts) {
830 error_setg(errp, "The number of fds passed does not match "
831 "the number of vhostfds passed");
832 ret = -1;
833 goto free_fail;
834 }
835 }
836
837 for (i = 0; i < nfds; i++) {
838 fd = monitor_fd_param(cur_mon, fds[i], &err);
839 if (fd == -1) {
840 error_propagate(errp, err);
841 ret = -1;
842 goto free_fail;
843 }
844
845 qemu_set_nonblock(fd);
846
847 if (i == 0) {
848 vnet_hdr = tap_probe_vnet_hdr(fd);
849 } else if (vnet_hdr != tap_probe_vnet_hdr(fd)) {
850 error_setg(errp,
851 "vnet_hdr not consistent across given tap fds");
852 ret = -1;
853 goto free_fail;
854 }
855
856 net_init_tap_one(tap, peer, "tap", name, ifname,
857 script, downscript,
858 tap->has_vhostfds ? vhost_fds[i] : NULL,
859 vnet_hdr, fd, &err);
860 if (err) {
861 error_propagate(errp, err);
862 ret = -1;
863 goto free_fail;
864 }
865 }
866
867free_fail:
868 for (i = 0; i < nvhosts; i++) {
869 g_free(vhost_fds[i]);
870 }
871 for (i = 0; i < nfds; i++) {
872 g_free(fds[i]);
873 }
874 g_free(fds);
875 g_free(vhost_fds);
876 return ret;
877 } else if (tap->has_helper) {
878 if (tap->has_ifname || tap->has_script || tap->has_downscript ||
879 tap->has_vnet_hdr || tap->has_queues || tap->has_vhostfds) {
880 error_setg(errp, "ifname=, script=, downscript=, vnet_hdr=, "
881 "queues=, and vhostfds= are invalid with helper=");
882 return -1;
883 }
884
885 fd = net_bridge_run_helper(tap->helper,
886 tap->has_br ?
887 tap->br : DEFAULT_BRIDGE_INTERFACE,
888 errp);
889 if (fd == -1) {
890 return -1;
891 }
892
893 qemu_set_nonblock(fd);
894 vnet_hdr = tap_probe_vnet_hdr(fd);
895
896 net_init_tap_one(tap, peer, "bridge", name, ifname,
897 script, downscript, vhostfdname,
898 vnet_hdr, fd, &err);
899 if (err) {
900 error_propagate(errp, err);
901 close(fd);
902 return -1;
903 }
904 } else {
905 if (tap->has_vhostfds) {
906 error_setg(errp, "vhostfds= is invalid if fds= wasn't specified");
907 return -1;
908 }
909 script = tap->has_script ? tap->script : DEFAULT_NETWORK_SCRIPT;
910 downscript = tap->has_downscript ? tap->downscript :
911 DEFAULT_NETWORK_DOWN_SCRIPT;
912
913 if (tap->has_ifname) {
914 pstrcpy(ifname, sizeof ifname, tap->ifname);
915 } else {
916 ifname[0] = '\0';
917 }
918
919 for (i = 0; i < queues; i++) {
920 fd = net_tap_init(tap, &vnet_hdr, i >= 1 ? "no" : script,
921 ifname, sizeof ifname, queues > 1, errp);
922 if (fd == -1) {
923 return -1;
924 }
925
926 if (queues > 1 && i == 0 && !tap->has_ifname) {
927 if (tap_fd_get_ifname(fd, ifname)) {
928 error_setg(errp, "Fail to get ifname");
929 close(fd);
930 return -1;
931 }
932 }
933
934 net_init_tap_one(tap, peer, "tap", name, ifname,
935 i >= 1 ? "no" : script,
936 i >= 1 ? "no" : downscript,
937 vhostfdname, vnet_hdr, fd, &err);
938 if (err) {
939 error_propagate(errp, err);
940 close(fd);
941 return -1;
942 }
943 }
944 }
945
946 return 0;
947}
948
949VHostNetState *tap_get_vhost_net(NetClientState *nc)
950{
951 TAPState *s = DO_UPCAST(TAPState, nc, nc);
952 assert(nc->info->type == NET_CLIENT_DRIVER_TAP);
953 return s->vhost_net;
954}
955
956int tap_enable(NetClientState *nc)
957{
958 TAPState *s = DO_UPCAST(TAPState, nc, nc);
959 int ret;
960
961 if (s->enabled) {
962 return 0;
963 } else {
964 ret = tap_fd_enable(s->fd);
965 if (ret == 0) {
966 s->enabled = true;
967 tap_update_fd_handler(s);
968 }
969 return ret;
970 }
971}
972
973int tap_disable(NetClientState *nc)
974{
975 TAPState *s = DO_UPCAST(TAPState, nc, nc);
976 int ret;
977
978 if (s->enabled == 0) {
979 return 0;
980 } else {
981 ret = tap_fd_disable(s->fd);
982 if (ret == 0) {
983 qemu_purge_queued_packets(nc);
984 s->enabled = false;
985 tap_update_fd_handler(s);
986 }
987 return ret;
988 }
989}
990