qemu-io-cmds: Fix two format strings
[qemu/ar7.git] / net / tap.c
blobcc8525f15422511d0082335082559fe593379bc8
1 /*
2 * QEMU System Emulator
4 * Copyright (c) 2003-2008 Fabrice Bellard
5 * Copyright (c) 2009 Red Hat, Inc.
7 * Permission is hereby granted, free of charge, to any person obtaining a copy
8 * of this software and associated documentation files (the "Software"), to deal
9 * in the Software without restriction, including without limitation the rights
10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
11 * copies of the Software, and to permit persons to whom the Software is
12 * furnished to do so, subject to the following conditions:
14 * The above copyright notice and this permission notice shall be included in
15 * all copies or substantial portions of the Software.
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
23 * THE SOFTWARE.
26 #include "qemu/osdep.h"
27 #include "tap_int.h"
30 #include <sys/ioctl.h>
31 #include <sys/wait.h>
32 #include <sys/socket.h>
33 #include <net/if.h>
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"
45 #include "net/tap.h"
47 #include "net/vhost_net.h"
49 typedef 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;
65 static void launch_script(const char *setup_script, const char *ifname,
66 int fd, Error **errp);
68 static void tap_send(void *opaque);
69 static void tap_writable(void *opaque);
71 static void tap_update_fd_handler(TAPState *s)
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);
79 static void tap_read_poll(TAPState *s, bool enable)
81 s->read_poll = enable;
82 tap_update_fd_handler(s);
85 static void tap_write_poll(TAPState *s, bool enable)
87 s->write_poll = enable;
88 tap_update_fd_handler(s);
91 static void tap_writable(void *opaque)
93 TAPState *s = opaque;
95 tap_write_poll(s, false);
97 qemu_flush_queued_packets(&s->nc);
100 static ssize_t tap_write_packet(TAPState *s, const struct iovec *iov, int iovcnt)
102 ssize_t len;
104 do {
105 len = writev(s->fd, iov, iovcnt);
106 } while (len == -1 && errno == EINTR);
108 if (len == -1 && errno == EAGAIN) {
109 tap_write_poll(s, true);
110 return 0;
113 return len;
116 static ssize_t tap_receive_iov(NetClientState *nc, const struct iovec *iov,
117 int iovcnt)
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 = { };
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++;
132 return tap_write_packet(s, iovp, iovcnt);
135 static ssize_t tap_receive_raw(NetClientState *nc, const uint8_t *buf, size_t size)
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 = { };
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++;
148 iov[iovcnt].iov_base = (char *)buf;
149 iov[iovcnt].iov_len = size;
150 iovcnt++;
152 return tap_write_packet(s, iov, iovcnt);
155 static ssize_t tap_receive(NetClientState *nc, const uint8_t *buf, size_t size)
157 TAPState *s = DO_UPCAST(TAPState, nc, nc);
158 struct iovec iov[1];
160 if (s->host_vnet_hdr_len && !s->using_vnet_hdr) {
161 return tap_receive_raw(nc, buf, size);
164 iov[0].iov_base = (char *)buf;
165 iov[0].iov_len = size;
167 return tap_write_packet(s, iov, 1);
170 #ifndef __sun__
171 ssize_t tap_read_packet(int tapfd, uint8_t *buf, int maxlen)
173 return read(tapfd, buf, maxlen);
175 #endif
177 static void tap_send_completed(NetClientState *nc, ssize_t len)
179 TAPState *s = DO_UPCAST(TAPState, nc, nc);
180 tap_read_poll(s, true);
183 static void tap_send(void *opaque)
185 TAPState *s = opaque;
186 int size;
187 int packets = 0;
189 while (true) {
190 uint8_t *buf = s->buf;
192 size = tap_read_packet(s->fd, s->buf, sizeof(s->buf));
193 if (size <= 0) {
194 break;
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;
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;
211 * When the host keeps receiving more packets while tap_send() is
212 * running we can hog the QEMU global mutex. Limit the number of
213 * packets that are processed per tap_send() callback to prevent
214 * stalling the guest.
216 packets++;
217 if (packets >= 50) {
218 break;
223 static bool tap_has_ufo(NetClientState *nc)
225 TAPState *s = DO_UPCAST(TAPState, nc, nc);
227 assert(nc->info->type == NET_CLIENT_DRIVER_TAP);
229 return s->has_ufo;
232 static bool tap_has_vnet_hdr(NetClientState *nc)
234 TAPState *s = DO_UPCAST(TAPState, nc, nc);
236 assert(nc->info->type == NET_CLIENT_DRIVER_TAP);
238 return !!s->host_vnet_hdr_len;
241 static bool tap_has_vnet_hdr_len(NetClientState *nc, int len)
243 TAPState *s = DO_UPCAST(TAPState, nc, nc);
245 assert(nc->info->type == NET_CLIENT_DRIVER_TAP);
247 return !!tap_probe_vnet_hdr_len(s->fd, len);
250 static void tap_set_vnet_hdr_len(NetClientState *nc, int len)
252 TAPState *s = DO_UPCAST(TAPState, nc, nc);
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));
258 tap_fd_set_vnet_hdr_len(s->fd, len);
259 s->host_vnet_hdr_len = len;
262 static void tap_using_vnet_hdr(NetClientState *nc, bool using_vnet_hdr)
264 TAPState *s = DO_UPCAST(TAPState, nc, nc);
266 assert(nc->info->type == NET_CLIENT_DRIVER_TAP);
267 assert(!!s->host_vnet_hdr_len == using_vnet_hdr);
269 s->using_vnet_hdr = using_vnet_hdr;
272 static int tap_set_vnet_le(NetClientState *nc, bool is_le)
274 TAPState *s = DO_UPCAST(TAPState, nc, nc);
276 return tap_fd_set_vnet_le(s->fd, is_le);
279 static int tap_set_vnet_be(NetClientState *nc, bool is_be)
281 TAPState *s = DO_UPCAST(TAPState, nc, nc);
283 return tap_fd_set_vnet_be(s->fd, is_be);
286 static void tap_set_offload(NetClientState *nc, int csum, int tso4,
287 int tso6, int ecn, int ufo)
289 TAPState *s = DO_UPCAST(TAPState, nc, nc);
290 if (s->fd < 0) {
291 return;
294 tap_fd_set_offload(s->fd, csum, tso4, tso6, ecn, ufo);
297 static void tap_exit_notify(Notifier *notifier, void *data)
299 TAPState *s = container_of(notifier, TAPState, exit);
300 Error *err = NULL;
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);
310 static void tap_cleanup(NetClientState *nc)
312 TAPState *s = DO_UPCAST(TAPState, nc, nc);
314 if (s->vhost_net) {
315 vhost_net_cleanup(s->vhost_net);
316 g_free(s->vhost_net);
317 s->vhost_net = NULL;
320 qemu_purge_queued_packets(nc);
322 tap_exit_notify(&s->exit, NULL);
323 qemu_remove_exit_notifier(&s->exit);
325 tap_read_poll(s, false);
326 tap_write_poll(s, false);
327 close(s->fd);
328 s->fd = -1;
331 static void tap_poll(NetClientState *nc, bool enable)
333 TAPState *s = DO_UPCAST(TAPState, nc, nc);
334 tap_read_poll(s, enable);
335 tap_write_poll(s, enable);
338 int tap_get_fd(NetClientState *nc)
340 TAPState *s = DO_UPCAST(TAPState, nc, nc);
341 assert(nc->info->type == NET_CLIENT_DRIVER_TAP);
342 return s->fd;
345 /* fd support */
347 static 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,
365 static TAPState *net_tap_fd_init(NetClientState *peer,
366 const char *model,
367 const char *name,
368 int fd,
369 int vnet_hdr)
371 NetClientState *nc;
372 TAPState *s;
374 nc = qemu_new_net_client(&net_tap_info, peer, model, name);
376 s = DO_UPCAST(TAPState, nc, nc);
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);
385 * Make sure host header length is set correctly in tap:
386 * it might have been modified by another instance of qemu.
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);
391 tap_read_poll(s, true);
392 s->vhost_net = NULL;
394 s->exit.notify = tap_exit_notify;
395 qemu_add_exit_notifier(&s->exit);
397 return s;
400 static void launch_script(const char *setup_script, const char *ifname,
401 int fd, Error **errp)
403 int pid, status;
404 char *args[3];
405 char **parg;
407 /* try to launch network script */
408 pid = fork();
409 if (pid < 0) {
410 error_setg_errno(errp, errno, "could not launch network script %s",
411 setup_script);
412 return;
414 if (pid == 0) {
415 int open_max = sysconf(_SC_OPEN_MAX), i;
417 for (i = 3; i < open_max; i++) {
418 if (i != fd) {
419 close(i);
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 /* loop */
433 if (WIFEXITED(status) && WEXITSTATUS(status) == 0) {
434 return;
436 error_setg(errp, "network script %s failed with status %d",
437 setup_script, status);
441 static int recv_fd(int c)
443 int fd;
444 uint8_t msgbuf[CMSG_SPACE(sizeof(fd))];
445 struct msghdr msg = {
446 .msg_control = msgbuf,
447 .msg_controllen = sizeof(msgbuf),
449 struct cmsghdr *cmsg;
450 struct iovec iov;
451 uint8_t req[1];
452 ssize_t len;
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;
460 iov.iov_base = req;
461 iov.iov_len = sizeof(req);
463 msg.msg_iov = &iov;
464 msg.msg_iovlen = 1;
466 len = recvmsg(c, &msg, 0);
467 if (len > 0) {
468 memcpy(&fd, CMSG_DATA(cmsg), sizeof(fd));
469 return fd;
472 return len;
475 static int net_bridge_run_helper(const char *helper, const char *bridge,
476 Error **errp)
478 sigset_t oldmask, mask;
479 int pid, status;
480 char *args[5];
481 char **parg;
482 int sv[2];
484 sigemptyset(&mask);
485 sigaddset(&mask, SIGCHLD);
486 sigprocmask(SIG_BLOCK, &mask, &oldmask);
488 if (socketpair(PF_UNIX, SOCK_STREAM, 0, sv) == -1) {
489 error_setg_errno(errp, errno, "socketpair() failed");
490 return -1;
493 /* try to launch bridge helper */
494 pid = fork();
495 if (pid < 0) {
496 error_setg_errno(errp, errno, "Can't fork bridge helper");
497 return -1;
499 if (pid == 0) {
500 int open_max = sysconf(_SC_OPEN_MAX), i;
501 char fd_buf[6+10];
502 char br_buf[6+IFNAMSIZ] = {0};
503 char helper_cmd[PATH_MAX + sizeof(fd_buf) + sizeof(br_buf) + 15];
505 for (i = 3; i < open_max; i++) {
506 if (i != sv[1]) {
507 close(i);
511 snprintf(fd_buf, sizeof(fd_buf), "%s%d", "--fd=", sv[1]);
513 if (strrchr(helper, ' ') || strrchr(helper, '\t')) {
514 /* assume helper is a command */
516 if (strstr(helper, "--br=") == NULL) {
517 snprintf(br_buf, sizeof(br_buf), "%s%s", "--br=", bridge);
520 snprintf(helper_cmd, sizeof(helper_cmd), "%s %s %s %s",
521 helper, "--use-vnet", fd_buf, br_buf);
523 parg = args;
524 *parg++ = (char *)"sh";
525 *parg++ = (char *)"-c";
526 *parg++ = helper_cmd;
527 *parg++ = NULL;
529 execv("/bin/sh", args);
530 } else {
531 /* assume helper is just the executable path name */
533 snprintf(br_buf, sizeof(br_buf), "%s%s", "--br=", bridge);
535 parg = args;
536 *parg++ = (char *)helper;
537 *parg++ = (char *)"--use-vnet";
538 *parg++ = fd_buf;
539 *parg++ = br_buf;
540 *parg++ = NULL;
542 execv(helper, args);
544 _exit(1);
546 } else {
547 int fd;
548 int saved_errno;
550 close(sv[1]);
552 do {
553 fd = recv_fd(sv[0]);
554 } while (fd == -1 && errno == EINTR);
555 saved_errno = errno;
557 close(sv[0]);
559 while (waitpid(pid, &status, 0) != pid) {
560 /* loop */
562 sigprocmask(SIG_SETMASK, &oldmask, NULL);
563 if (fd < 0) {
564 error_setg_errno(errp, saved_errno,
565 "failed to recv file descriptor");
566 return -1;
568 if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
569 error_setg(errp, "bridge helper failed");
570 return -1;
572 return fd;
576 int net_init_bridge(const Netdev *netdev, const char *name,
577 NetClientState *peer, Error **errp)
579 const NetdevBridgeOptions *bridge;
580 const char *helper, *br;
581 TAPState *s;
582 int fd, vnet_hdr;
584 assert(netdev->type == NET_CLIENT_DRIVER_BRIDGE);
585 bridge = &netdev->u.bridge;
587 helper = bridge->has_helper ? bridge->helper : DEFAULT_BRIDGE_HELPER;
588 br = bridge->has_br ? bridge->br : DEFAULT_BRIDGE_INTERFACE;
590 fd = net_bridge_run_helper(helper, br, errp);
591 if (fd == -1) {
592 return -1;
595 fcntl(fd, F_SETFL, O_NONBLOCK);
596 vnet_hdr = tap_probe_vnet_hdr(fd);
597 s = net_tap_fd_init(peer, "bridge", name, fd, vnet_hdr);
599 snprintf(s->nc.info_str, sizeof(s->nc.info_str), "helper=%s,br=%s", helper,
600 br);
602 return 0;
605 static int net_tap_init(const NetdevTapOptions *tap, int *vnet_hdr,
606 const char *setup_script, char *ifname,
607 size_t ifname_sz, int mq_required, Error **errp)
609 Error *err = NULL;
610 int fd, vnet_hdr_required;
612 if (tap->has_vnet_hdr) {
613 *vnet_hdr = tap->vnet_hdr;
614 vnet_hdr_required = *vnet_hdr;
615 } else {
616 *vnet_hdr = 1;
617 vnet_hdr_required = 0;
620 TFR(fd = tap_open(ifname, ifname_sz, vnet_hdr, vnet_hdr_required,
621 mq_required, errp));
622 if (fd < 0) {
623 return -1;
626 if (setup_script &&
627 setup_script[0] != '\0' &&
628 strcmp(setup_script, "no") != 0) {
629 launch_script(setup_script, ifname, fd, &err);
630 if (err) {
631 error_propagate(errp, err);
632 close(fd);
633 return -1;
637 return fd;
640 #define MAX_TAP_QUEUES 1024
642 static void net_init_tap_one(const NetdevTapOptions *tap, NetClientState *peer,
643 const char *model, const char *name,
644 const char *ifname, const char *script,
645 const char *downscript, const char *vhostfdname,
646 int vnet_hdr, int fd, Error **errp)
648 Error *err = NULL;
649 TAPState *s = net_tap_fd_init(peer, model, name, fd, vnet_hdr);
650 int vhostfd;
652 tap_set_sndbuf(s->fd, tap, &err);
653 if (err) {
654 error_propagate(errp, err);
655 return;
658 if (tap->has_fd || tap->has_fds) {
659 snprintf(s->nc.info_str, sizeof(s->nc.info_str), "fd=%d", fd);
660 } else if (tap->has_helper) {
661 snprintf(s->nc.info_str, sizeof(s->nc.info_str), "helper=%s",
662 tap->helper);
663 } else {
664 snprintf(s->nc.info_str, sizeof(s->nc.info_str),
665 "ifname=%s,script=%s,downscript=%s", ifname, script,
666 downscript);
668 if (strcmp(downscript, "no") != 0) {
669 snprintf(s->down_script, sizeof(s->down_script), "%s", downscript);
670 snprintf(s->down_script_arg, sizeof(s->down_script_arg),
671 "%s", ifname);
675 if (tap->has_vhost ? tap->vhost :
676 vhostfdname || (tap->has_vhostforce && tap->vhostforce)) {
677 VhostNetOptions options;
679 options.backend_type = VHOST_BACKEND_TYPE_KERNEL;
680 options.net_backend = &s->nc;
681 if (tap->has_poll_us) {
682 options.busyloop_timeout = tap->poll_us;
683 } else {
684 options.busyloop_timeout = 0;
687 if (vhostfdname) {
688 vhostfd = monitor_fd_param(cur_mon, vhostfdname, &err);
689 if (vhostfd == -1) {
690 if (tap->has_vhostforce && tap->vhostforce) {
691 error_propagate(errp, err);
692 } else {
693 warn_report_err(err);
695 return;
697 qemu_set_nonblock(vhostfd);
698 } else {
699 vhostfd = open("/dev/vhost-net", O_RDWR);
700 if (vhostfd < 0) {
701 if (tap->has_vhostforce && tap->vhostforce) {
702 error_setg_errno(errp, errno,
703 "tap: open vhost char device failed");
704 } else {
705 warn_report("tap: open vhost char device failed: %s",
706 strerror(errno));
708 return;
710 fcntl(vhostfd, F_SETFL, O_NONBLOCK);
712 options.opaque = (void *)(uintptr_t)vhostfd;
714 s->vhost_net = vhost_net_init(&options);
715 if (!s->vhost_net) {
716 if (tap->has_vhostforce && tap->vhostforce) {
717 error_setg(errp, VHOST_NET_INIT_FAILED);
718 } else {
719 warn_report(VHOST_NET_INIT_FAILED);
721 return;
723 } else if (vhostfdname) {
724 error_setg(errp, "vhostfd(s)= is not valid without vhost");
728 static int get_fds(char *str, char *fds[], int max)
730 char *ptr = str, *this;
731 size_t len = strlen(str);
732 int i = 0;
734 while (i < max && ptr < str + len) {
735 this = strchr(ptr, ':');
737 if (this == NULL) {
738 fds[i] = g_strdup(ptr);
739 } else {
740 fds[i] = g_strndup(ptr, this - ptr);
743 i++;
744 if (this == NULL) {
745 break;
746 } else {
747 ptr = this + 1;
751 return i;
754 int net_init_tap(const Netdev *netdev, const char *name,
755 NetClientState *peer, Error **errp)
757 const NetdevTapOptions *tap;
758 int fd, vnet_hdr = 0, i = 0, queues;
759 /* for the no-fd, no-helper case */
760 const char *script = NULL; /* suppress wrong "uninit'd use" gcc warning */
761 const char *downscript = NULL;
762 Error *err = NULL;
763 const char *vhostfdname;
764 char ifname[128];
766 assert(netdev->type == NET_CLIENT_DRIVER_TAP);
767 tap = &netdev->u.tap;
768 queues = tap->has_queues ? tap->queues : 1;
769 vhostfdname = tap->has_vhostfd ? tap->vhostfd : NULL;
771 /* QEMU hubs do not support multiqueue tap, in this case peer is set.
772 * For -netdev, peer is always NULL. */
773 if (peer && (tap->has_queues || tap->has_fds || tap->has_vhostfds)) {
774 error_setg(errp, "Multiqueue tap cannot be used with hubs");
775 return -1;
778 if (tap->has_fd) {
779 if (tap->has_ifname || tap->has_script || tap->has_downscript ||
780 tap->has_vnet_hdr || tap->has_helper || tap->has_queues ||
781 tap->has_fds || tap->has_vhostfds) {
782 error_setg(errp, "ifname=, script=, downscript=, vnet_hdr=, "
783 "helper=, queues=, fds=, and vhostfds= "
784 "are invalid with fd=");
785 return -1;
788 fd = monitor_fd_param(cur_mon, tap->fd, &err);
789 if (fd == -1) {
790 error_propagate(errp, err);
791 return -1;
794 fcntl(fd, F_SETFL, O_NONBLOCK);
796 vnet_hdr = tap_probe_vnet_hdr(fd);
798 net_init_tap_one(tap, peer, "tap", name, NULL,
799 script, downscript,
800 vhostfdname, vnet_hdr, fd, &err);
801 if (err) {
802 error_propagate(errp, err);
803 return -1;
805 } else if (tap->has_fds) {
806 char **fds;
807 char **vhost_fds;
808 int nfds = 0, nvhosts = 0;
809 int ret = 0;
811 if (tap->has_ifname || tap->has_script || tap->has_downscript ||
812 tap->has_vnet_hdr || tap->has_helper || tap->has_queues ||
813 tap->has_vhostfd) {
814 error_setg(errp, "ifname=, script=, downscript=, vnet_hdr=, "
815 "helper=, queues=, and vhostfd= "
816 "are invalid with fds=");
817 return -1;
820 fds = g_new0(char *, MAX_TAP_QUEUES);
821 vhost_fds = g_new0(char *, MAX_TAP_QUEUES);
823 nfds = get_fds(tap->fds, fds, MAX_TAP_QUEUES);
824 if (tap->has_vhostfds) {
825 nvhosts = get_fds(tap->vhostfds, vhost_fds, MAX_TAP_QUEUES);
826 if (nfds != nvhosts) {
827 error_setg(errp, "The number of fds passed does not match "
828 "the number of vhostfds passed");
829 ret = -1;
830 goto free_fail;
834 for (i = 0; i < nfds; i++) {
835 fd = monitor_fd_param(cur_mon, fds[i], &err);
836 if (fd == -1) {
837 error_propagate(errp, err);
838 ret = -1;
839 goto free_fail;
842 fcntl(fd, F_SETFL, O_NONBLOCK);
844 if (i == 0) {
845 vnet_hdr = tap_probe_vnet_hdr(fd);
846 } else if (vnet_hdr != tap_probe_vnet_hdr(fd)) {
847 error_setg(errp,
848 "vnet_hdr not consistent across given tap fds");
849 ret = -1;
850 goto free_fail;
853 net_init_tap_one(tap, peer, "tap", name, ifname,
854 script, downscript,
855 tap->has_vhostfds ? vhost_fds[i] : NULL,
856 vnet_hdr, fd, &err);
857 if (err) {
858 error_propagate(errp, err);
859 ret = -1;
860 goto free_fail;
864 free_fail:
865 for (i = 0; i < nvhosts; i++) {
866 g_free(vhost_fds[i]);
868 for (i = 0; i < nfds; i++) {
869 g_free(fds[i]);
871 g_free(fds);
872 g_free(vhost_fds);
873 return ret;
874 } else if (tap->has_helper) {
875 if (tap->has_ifname || tap->has_script || tap->has_downscript ||
876 tap->has_vnet_hdr || tap->has_queues || tap->has_vhostfds) {
877 error_setg(errp, "ifname=, script=, downscript=, vnet_hdr=, "
878 "queues=, and vhostfds= are invalid with helper=");
879 return -1;
882 fd = net_bridge_run_helper(tap->helper,
883 tap->has_br ?
884 tap->br : DEFAULT_BRIDGE_INTERFACE,
885 errp);
886 if (fd == -1) {
887 return -1;
890 fcntl(fd, F_SETFL, O_NONBLOCK);
891 vnet_hdr = tap_probe_vnet_hdr(fd);
893 net_init_tap_one(tap, peer, "bridge", name, ifname,
894 script, downscript, vhostfdname,
895 vnet_hdr, fd, &err);
896 if (err) {
897 error_propagate(errp, err);
898 close(fd);
899 return -1;
901 } else {
902 if (tap->has_vhostfds) {
903 error_setg(errp, "vhostfds= is invalid if fds= wasn't specified");
904 return -1;
906 script = tap->has_script ? tap->script : DEFAULT_NETWORK_SCRIPT;
907 downscript = tap->has_downscript ? tap->downscript :
908 DEFAULT_NETWORK_DOWN_SCRIPT;
910 if (tap->has_ifname) {
911 pstrcpy(ifname, sizeof ifname, tap->ifname);
912 } else {
913 ifname[0] = '\0';
916 for (i = 0; i < queues; i++) {
917 fd = net_tap_init(tap, &vnet_hdr, i >= 1 ? "no" : script,
918 ifname, sizeof ifname, queues > 1, errp);
919 if (fd == -1) {
920 return -1;
923 if (queues > 1 && i == 0 && !tap->has_ifname) {
924 if (tap_fd_get_ifname(fd, ifname)) {
925 error_setg(errp, "Fail to get ifname");
926 close(fd);
927 return -1;
931 net_init_tap_one(tap, peer, "tap", name, ifname,
932 i >= 1 ? "no" : script,
933 i >= 1 ? "no" : downscript,
934 vhostfdname, vnet_hdr, fd, &err);
935 if (err) {
936 error_propagate(errp, err);
937 close(fd);
938 return -1;
943 return 0;
946 VHostNetState *tap_get_vhost_net(NetClientState *nc)
948 TAPState *s = DO_UPCAST(TAPState, nc, nc);
949 assert(nc->info->type == NET_CLIENT_DRIVER_TAP);
950 return s->vhost_net;
953 int tap_enable(NetClientState *nc)
955 TAPState *s = DO_UPCAST(TAPState, nc, nc);
956 int ret;
958 if (s->enabled) {
959 return 0;
960 } else {
961 ret = tap_fd_enable(s->fd);
962 if (ret == 0) {
963 s->enabled = true;
964 tap_update_fd_handler(s);
966 return ret;
970 int tap_disable(NetClientState *nc)
972 TAPState *s = DO_UPCAST(TAPState, nc, nc);
973 int ret;
975 if (s->enabled == 0) {
976 return 0;
977 } else {
978 ret = tap_fd_disable(s->fd);
979 if (ret == 0) {
980 qemu_purge_queued_packets(nc);
981 s->enabled = false;
982 tap_update_fd_handler(s);
984 return ret;