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5281d757 MM |
1 | /* |
2 | * QEMU System Emulator | |
3 | * | |
4 | * Copyright (c) 2003-2008 Fabrice Bellard | |
5 | * Copyright (c) 2009 Red Hat, Inc. | |
6 | * | |
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: | |
13 | * | |
14 | * The above copyright notice and this permission notice shall be included in | |
15 | * all copies or substantial portions of the Software. | |
16 | * | |
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. | |
24 | */ | |
25 | ||
2744d920 | 26 | #include "qemu/osdep.h" |
1422e32d | 27 | #include "tap_int.h" |
5281d757 | 28 | |
5281d757 | 29 | |
5281d757 | 30 | #include <sys/ioctl.h> |
5281d757 | 31 | #include <sys/wait.h> |
71f4effc | 32 | #include <sys/socket.h> |
5281d757 MM |
33 | #include <net/if.h> |
34 | ||
1422e32d | 35 | #include "net/net.h" |
a245fc18 | 36 | #include "clients.h" |
83c9089e | 37 | #include "monitor/monitor.h" |
9c17d615 | 38 | #include "sysemu/sysemu.h" |
da34e65c | 39 | #include "qapi/error.h" |
5281d757 | 40 | #include "qemu-common.h" |
f348b6d1 | 41 | #include "qemu/cutils.h" |
1de7afc9 | 42 | #include "qemu/error-report.h" |
db725815 | 43 | #include "qemu/main-loop.h" |
d542800d | 44 | #include "qemu/sockets.h" |
5281d757 | 45 | |
1422e32d | 46 | #include "net/tap.h" |
5281d757 | 47 | |
0d09e41a | 48 | #include "net/vhost_net.h" |
82b0d80e | 49 | |
5281d757 | 50 | typedef struct TAPState { |
4e68f7a0 | 51 | NetClientState nc; |
5281d757 MM |
52 | int fd; |
53 | char down_script[1024]; | |
54 | char down_script_arg[128]; | |
d32fcad3 | 55 | uint8_t buf[NET_BUFSIZE]; |
ec45f083 JW |
56 | bool read_poll; |
57 | bool write_poll; | |
58 | bool using_vnet_hdr; | |
59 | bool has_ufo; | |
16dbaf90 | 60 | bool enabled; |
82b0d80e | 61 | VHostNetState *vhost_net; |
ef4252b1 | 62 | unsigned host_vnet_hdr_len; |
9e32ff32 | 63 | Notifier exit; |
5281d757 MM |
64 | } TAPState; |
65 | ||
ac4fcf56 MA |
66 | static void launch_script(const char *setup_script, const char *ifname, |
67 | int fd, Error **errp); | |
5281d757 | 68 | |
5281d757 MM |
69 | static void tap_send(void *opaque); |
70 | static void tap_writable(void *opaque); | |
71 | ||
72 | static void tap_update_fd_handler(TAPState *s) | |
73 | { | |
82e1cc4b FZ |
74 | qemu_set_fd_handler(s->fd, |
75 | s->read_poll && s->enabled ? tap_send : NULL, | |
76 | s->write_poll && s->enabled ? tap_writable : NULL, | |
77 | s); | |
5281d757 MM |
78 | } |
79 | ||
ec45f083 | 80 | static void tap_read_poll(TAPState *s, bool enable) |
5281d757 | 81 | { |
ec45f083 | 82 | s->read_poll = enable; |
5281d757 MM |
83 | tap_update_fd_handler(s); |
84 | } | |
85 | ||
ec45f083 | 86 | static void tap_write_poll(TAPState *s, bool enable) |
5281d757 | 87 | { |
ec45f083 | 88 | s->write_poll = enable; |
5281d757 MM |
89 | tap_update_fd_handler(s); |
90 | } | |
91 | ||
92 | static void tap_writable(void *opaque) | |
93 | { | |
94 | TAPState *s = opaque; | |
95 | ||
ec45f083 | 96 | tap_write_poll(s, false); |
5281d757 | 97 | |
3e35ba93 | 98 | qemu_flush_queued_packets(&s->nc); |
5281d757 MM |
99 | } |
100 | ||
101 | static ssize_t tap_write_packet(TAPState *s, const struct iovec *iov, int iovcnt) | |
102 | { | |
103 | ssize_t len; | |
104 | ||
105 | do { | |
106 | len = writev(s->fd, iov, iovcnt); | |
107 | } while (len == -1 && errno == EINTR); | |
108 | ||
109 | if (len == -1 && errno == EAGAIN) { | |
ec45f083 | 110 | tap_write_poll(s, true); |
5281d757 MM |
111 | return 0; |
112 | } | |
113 | ||
114 | return len; | |
115 | } | |
116 | ||
4e68f7a0 | 117 | static ssize_t tap_receive_iov(NetClientState *nc, const struct iovec *iov, |
5281d757 MM |
118 | int iovcnt) |
119 | { | |
3e35ba93 | 120 | TAPState *s = DO_UPCAST(TAPState, nc, nc); |
5281d757 MM |
121 | const struct iovec *iovp = iov; |
122 | struct iovec iov_copy[iovcnt + 1]; | |
ef4252b1 | 123 | struct virtio_net_hdr_mrg_rxbuf hdr = { }; |
5281d757 | 124 | |
ef4252b1 | 125 | if (s->host_vnet_hdr_len && !s->using_vnet_hdr) { |
5281d757 | 126 | iov_copy[0].iov_base = &hdr; |
ef4252b1 | 127 | iov_copy[0].iov_len = s->host_vnet_hdr_len; |
5281d757 MM |
128 | memcpy(&iov_copy[1], iov, iovcnt * sizeof(*iov)); |
129 | iovp = iov_copy; | |
130 | iovcnt++; | |
131 | } | |
132 | ||
133 | return tap_write_packet(s, iovp, iovcnt); | |
134 | } | |
135 | ||
4e68f7a0 | 136 | static ssize_t tap_receive_raw(NetClientState *nc, const uint8_t *buf, size_t size) |
5281d757 | 137 | { |
3e35ba93 | 138 | TAPState *s = DO_UPCAST(TAPState, nc, nc); |
5281d757 MM |
139 | struct iovec iov[2]; |
140 | int iovcnt = 0; | |
ef4252b1 | 141 | struct virtio_net_hdr_mrg_rxbuf hdr = { }; |
5281d757 | 142 | |
ef4252b1 | 143 | if (s->host_vnet_hdr_len) { |
5281d757 | 144 | iov[iovcnt].iov_base = &hdr; |
ef4252b1 | 145 | iov[iovcnt].iov_len = s->host_vnet_hdr_len; |
5281d757 MM |
146 | iovcnt++; |
147 | } | |
148 | ||
149 | iov[iovcnt].iov_base = (char *)buf; | |
150 | iov[iovcnt].iov_len = size; | |
151 | iovcnt++; | |
152 | ||
153 | return tap_write_packet(s, iov, iovcnt); | |
154 | } | |
155 | ||
4e68f7a0 | 156 | static ssize_t tap_receive(NetClientState *nc, const uint8_t *buf, size_t size) |
5281d757 | 157 | { |
3e35ba93 | 158 | TAPState *s = DO_UPCAST(TAPState, nc, nc); |
5281d757 MM |
159 | struct iovec iov[1]; |
160 | ||
ef4252b1 | 161 | if (s->host_vnet_hdr_len && !s->using_vnet_hdr) { |
3e35ba93 | 162 | return tap_receive_raw(nc, buf, size); |
5281d757 MM |
163 | } |
164 | ||
165 | iov[0].iov_base = (char *)buf; | |
166 | iov[0].iov_len = size; | |
167 | ||
168 | return tap_write_packet(s, iov, 1); | |
169 | } | |
170 | ||
966ea5ec MM |
171 | #ifndef __sun__ |
172 | ssize_t tap_read_packet(int tapfd, uint8_t *buf, int maxlen) | |
5281d757 MM |
173 | { |
174 | return read(tapfd, buf, maxlen); | |
175 | } | |
176 | #endif | |
177 | ||
4e68f7a0 | 178 | static void tap_send_completed(NetClientState *nc, ssize_t len) |
5281d757 | 179 | { |
3e35ba93 | 180 | TAPState *s = DO_UPCAST(TAPState, nc, nc); |
ec45f083 | 181 | tap_read_poll(s, true); |
5281d757 MM |
182 | } |
183 | ||
184 | static void tap_send(void *opaque) | |
185 | { | |
186 | TAPState *s = opaque; | |
187 | int size; | |
756ae78b | 188 | int packets = 0; |
5281d757 | 189 | |
a90a7425 | 190 | while (true) { |
5819c918 MM |
191 | uint8_t *buf = s->buf; |
192 | ||
193 | size = tap_read_packet(s->fd, s->buf, sizeof(s->buf)); | |
194 | if (size <= 0) { | |
195 | break; | |
196 | } | |
197 | ||
ef4252b1 MT |
198 | if (s->host_vnet_hdr_len && !s->using_vnet_hdr) { |
199 | buf += s->host_vnet_hdr_len; | |
200 | size -= s->host_vnet_hdr_len; | |
5819c918 MM |
201 | } |
202 | ||
3e35ba93 | 203 | size = qemu_send_packet_async(&s->nc, buf, size, tap_send_completed); |
5819c918 | 204 | if (size == 0) { |
ec45f083 | 205 | tap_read_poll(s, false); |
68e5ec64 SH |
206 | break; |
207 | } else if (size < 0) { | |
208 | break; | |
5819c918 | 209 | } |
756ae78b WK |
210 | |
211 | /* | |
212 | * When the host keeps receiving more packets while tap_send() is | |
213 | * running we can hog the QEMU global mutex. Limit the number of | |
214 | * packets that are processed per tap_send() callback to prevent | |
215 | * stalling the guest. | |
216 | */ | |
217 | packets++; | |
218 | if (packets >= 50) { | |
219 | break; | |
220 | } | |
68e5ec64 | 221 | } |
5281d757 MM |
222 | } |
223 | ||
3bac80d3 | 224 | static bool tap_has_ufo(NetClientState *nc) |
5281d757 | 225 | { |
3e35ba93 | 226 | TAPState *s = DO_UPCAST(TAPState, nc, nc); |
5281d757 | 227 | |
f394b2e2 | 228 | assert(nc->info->type == NET_CLIENT_DRIVER_TAP); |
5281d757 MM |
229 | |
230 | return s->has_ufo; | |
231 | } | |
232 | ||
3bac80d3 | 233 | static bool tap_has_vnet_hdr(NetClientState *nc) |
5281d757 | 234 | { |
3e35ba93 | 235 | TAPState *s = DO_UPCAST(TAPState, nc, nc); |
5281d757 | 236 | |
f394b2e2 | 237 | assert(nc->info->type == NET_CLIENT_DRIVER_TAP); |
5281d757 | 238 | |
ef4252b1 | 239 | return !!s->host_vnet_hdr_len; |
5281d757 MM |
240 | } |
241 | ||
3bac80d3 | 242 | static bool tap_has_vnet_hdr_len(NetClientState *nc, int len) |
445d892f MT |
243 | { |
244 | TAPState *s = DO_UPCAST(TAPState, nc, nc); | |
245 | ||
f394b2e2 | 246 | assert(nc->info->type == NET_CLIENT_DRIVER_TAP); |
445d892f | 247 | |
e96dfd11 | 248 | return !!tap_probe_vnet_hdr_len(s->fd, len); |
445d892f MT |
249 | } |
250 | ||
3bac80d3 | 251 | static void tap_set_vnet_hdr_len(NetClientState *nc, int len) |
445d892f MT |
252 | { |
253 | TAPState *s = DO_UPCAST(TAPState, nc, nc); | |
254 | ||
f394b2e2 | 255 | assert(nc->info->type == NET_CLIENT_DRIVER_TAP); |
445d892f | 256 | assert(len == sizeof(struct virtio_net_hdr_mrg_rxbuf) || |
fbbdbdde YB |
257 | len == sizeof(struct virtio_net_hdr) || |
258 | len == sizeof(struct virtio_net_hdr_v1_hash)); | |
445d892f MT |
259 | |
260 | tap_fd_set_vnet_hdr_len(s->fd, len); | |
261 | s->host_vnet_hdr_len = len; | |
262 | } | |
263 | ||
3bac80d3 | 264 | static void tap_using_vnet_hdr(NetClientState *nc, bool using_vnet_hdr) |
5281d757 | 265 | { |
3e35ba93 | 266 | TAPState *s = DO_UPCAST(TAPState, nc, nc); |
5281d757 | 267 | |
f394b2e2 | 268 | assert(nc->info->type == NET_CLIENT_DRIVER_TAP); |
ef4252b1 | 269 | assert(!!s->host_vnet_hdr_len == using_vnet_hdr); |
5281d757 MM |
270 | |
271 | s->using_vnet_hdr = using_vnet_hdr; | |
272 | } | |
273 | ||
c80cd6bb GK |
274 | static int tap_set_vnet_le(NetClientState *nc, bool is_le) |
275 | { | |
276 | TAPState *s = DO_UPCAST(TAPState, nc, nc); | |
277 | ||
278 | return tap_fd_set_vnet_le(s->fd, is_le); | |
279 | } | |
280 | ||
281 | static int tap_set_vnet_be(NetClientState *nc, bool is_be) | |
282 | { | |
283 | TAPState *s = DO_UPCAST(TAPState, nc, nc); | |
284 | ||
285 | return tap_fd_set_vnet_be(s->fd, is_be); | |
286 | } | |
287 | ||
3bac80d3 | 288 | static void tap_set_offload(NetClientState *nc, int csum, int tso4, |
5281d757 MM |
289 | int tso6, int ecn, int ufo) |
290 | { | |
3e35ba93 | 291 | TAPState *s = DO_UPCAST(TAPState, nc, nc); |
27a6375d MT |
292 | if (s->fd < 0) { |
293 | return; | |
294 | } | |
5281d757 | 295 | |
27a6375d | 296 | tap_fd_set_offload(s->fd, csum, tso4, tso6, ecn, ufo); |
5281d757 MM |
297 | } |
298 | ||
9e32ff32 MAL |
299 | static void tap_exit_notify(Notifier *notifier, void *data) |
300 | { | |
301 | TAPState *s = container_of(notifier, TAPState, exit); | |
302 | Error *err = NULL; | |
303 | ||
304 | if (s->down_script[0]) { | |
305 | launch_script(s->down_script, s->down_script_arg, s->fd, &err); | |
306 | if (err) { | |
307 | error_report_err(err); | |
308 | } | |
309 | } | |
310 | } | |
311 | ||
4e68f7a0 | 312 | static void tap_cleanup(NetClientState *nc) |
5281d757 | 313 | { |
3e35ba93 | 314 | TAPState *s = DO_UPCAST(TAPState, nc, nc); |
5281d757 | 315 | |
82b0d80e MT |
316 | if (s->vhost_net) { |
317 | vhost_net_cleanup(s->vhost_net); | |
e6bcb1b6 | 318 | g_free(s->vhost_net); |
43849424 | 319 | s->vhost_net = NULL; |
82b0d80e MT |
320 | } |
321 | ||
3e35ba93 | 322 | qemu_purge_queued_packets(nc); |
5281d757 | 323 | |
9e32ff32 MAL |
324 | tap_exit_notify(&s->exit, NULL); |
325 | qemu_remove_exit_notifier(&s->exit); | |
5281d757 | 326 | |
ec45f083 JW |
327 | tap_read_poll(s, false); |
328 | tap_write_poll(s, false); | |
5281d757 | 329 | close(s->fd); |
27a6375d | 330 | s->fd = -1; |
5281d757 MM |
331 | } |
332 | ||
4e68f7a0 | 333 | static void tap_poll(NetClientState *nc, bool enable) |
ceb69615 MT |
334 | { |
335 | TAPState *s = DO_UPCAST(TAPState, nc, nc); | |
336 | tap_read_poll(s, enable); | |
337 | tap_write_poll(s, enable); | |
338 | } | |
339 | ||
4e68f7a0 | 340 | int tap_get_fd(NetClientState *nc) |
95d528a2 MT |
341 | { |
342 | TAPState *s = DO_UPCAST(TAPState, nc, nc); | |
f394b2e2 | 343 | assert(nc->info->type == NET_CLIENT_DRIVER_TAP); |
95d528a2 MT |
344 | return s->fd; |
345 | } | |
346 | ||
5281d757 MM |
347 | /* fd support */ |
348 | ||
3e35ba93 | 349 | static NetClientInfo net_tap_info = { |
f394b2e2 | 350 | .type = NET_CLIENT_DRIVER_TAP, |
3e35ba93 MM |
351 | .size = sizeof(TAPState), |
352 | .receive = tap_receive, | |
353 | .receive_raw = tap_receive_raw, | |
354 | .receive_iov = tap_receive_iov, | |
ceb69615 | 355 | .poll = tap_poll, |
3e35ba93 | 356 | .cleanup = tap_cleanup, |
2e753bcc VM |
357 | .has_ufo = tap_has_ufo, |
358 | .has_vnet_hdr = tap_has_vnet_hdr, | |
359 | .has_vnet_hdr_len = tap_has_vnet_hdr_len, | |
360 | .using_vnet_hdr = tap_using_vnet_hdr, | |
361 | .set_offload = tap_set_offload, | |
362 | .set_vnet_hdr_len = tap_set_vnet_hdr_len, | |
c80cd6bb GK |
363 | .set_vnet_le = tap_set_vnet_le, |
364 | .set_vnet_be = tap_set_vnet_be, | |
3e35ba93 MM |
365 | }; |
366 | ||
4e68f7a0 | 367 | static TAPState *net_tap_fd_init(NetClientState *peer, |
5281d757 MM |
368 | const char *model, |
369 | const char *name, | |
370 | int fd, | |
371 | int vnet_hdr) | |
372 | { | |
4e68f7a0 | 373 | NetClientState *nc; |
5281d757 | 374 | TAPState *s; |
5281d757 | 375 | |
ab5f3f84 | 376 | nc = qemu_new_net_client(&net_tap_info, peer, model, name); |
3e35ba93 MM |
377 | |
378 | s = DO_UPCAST(TAPState, nc, nc); | |
379 | ||
5281d757 | 380 | s->fd = fd; |
ef4252b1 | 381 | s->host_vnet_hdr_len = vnet_hdr ? sizeof(struct virtio_net_hdr) : 0; |
ec45f083 | 382 | s->using_vnet_hdr = false; |
9c282718 | 383 | s->has_ufo = tap_probe_has_ufo(s->fd); |
16dbaf90 | 384 | s->enabled = true; |
3e35ba93 | 385 | tap_set_offload(&s->nc, 0, 0, 0, 0, 0); |
58ddcd50 MT |
386 | /* |
387 | * Make sure host header length is set correctly in tap: | |
388 | * it might have been modified by another instance of qemu. | |
389 | */ | |
390 | if (tap_probe_vnet_hdr_len(s->fd, s->host_vnet_hdr_len)) { | |
391 | tap_fd_set_vnet_hdr_len(s->fd, s->host_vnet_hdr_len); | |
392 | } | |
ec45f083 | 393 | tap_read_poll(s, true); |
82b0d80e | 394 | s->vhost_net = NULL; |
9e32ff32 MAL |
395 | |
396 | s->exit.notify = tap_exit_notify; | |
397 | qemu_add_exit_notifier(&s->exit); | |
398 | ||
5281d757 MM |
399 | return s; |
400 | } | |
401 | ||
ac4fcf56 MA |
402 | static void launch_script(const char *setup_script, const char *ifname, |
403 | int fd, Error **errp) | |
5281d757 | 404 | { |
5281d757 MM |
405 | int pid, status; |
406 | char *args[3]; | |
407 | char **parg; | |
408 | ||
5281d757 MM |
409 | /* try to launch network script */ |
410 | pid = fork(); | |
ac4fcf56 MA |
411 | if (pid < 0) { |
412 | error_setg_errno(errp, errno, "could not launch network script %s", | |
413 | setup_script); | |
414 | return; | |
415 | } | |
5281d757 MM |
416 | if (pid == 0) { |
417 | int open_max = sysconf(_SC_OPEN_MAX), i; | |
418 | ||
13a12f86 PG |
419 | for (i = 3; i < open_max; i++) { |
420 | if (i != fd) { | |
5281d757 MM |
421 | close(i); |
422 | } | |
423 | } | |
424 | parg = args; | |
425 | *parg++ = (char *)setup_script; | |
426 | *parg++ = (char *)ifname; | |
9678d950 | 427 | *parg = NULL; |
5281d757 MM |
428 | execv(setup_script, args); |
429 | _exit(1); | |
ac4fcf56 | 430 | } else { |
5281d757 MM |
431 | while (waitpid(pid, &status, 0) != pid) { |
432 | /* loop */ | |
433 | } | |
5281d757 MM |
434 | |
435 | if (WIFEXITED(status) && WEXITSTATUS(status) == 0) { | |
ac4fcf56 | 436 | return; |
5281d757 | 437 | } |
ac4fcf56 MA |
438 | error_setg(errp, "network script %s failed with status %d", |
439 | setup_script, status); | |
5281d757 | 440 | } |
5281d757 MM |
441 | } |
442 | ||
a7c36ee4 CB |
443 | static int recv_fd(int c) |
444 | { | |
445 | int fd; | |
446 | uint8_t msgbuf[CMSG_SPACE(sizeof(fd))]; | |
447 | struct msghdr msg = { | |
448 | .msg_control = msgbuf, | |
449 | .msg_controllen = sizeof(msgbuf), | |
450 | }; | |
451 | struct cmsghdr *cmsg; | |
452 | struct iovec iov; | |
453 | uint8_t req[1]; | |
454 | ssize_t len; | |
455 | ||
456 | cmsg = CMSG_FIRSTHDR(&msg); | |
457 | cmsg->cmsg_level = SOL_SOCKET; | |
458 | cmsg->cmsg_type = SCM_RIGHTS; | |
459 | cmsg->cmsg_len = CMSG_LEN(sizeof(fd)); | |
460 | msg.msg_controllen = cmsg->cmsg_len; | |
461 | ||
462 | iov.iov_base = req; | |
463 | iov.iov_len = sizeof(req); | |
464 | ||
465 | msg.msg_iov = &iov; | |
466 | msg.msg_iovlen = 1; | |
467 | ||
468 | len = recvmsg(c, &msg, 0); | |
469 | if (len > 0) { | |
470 | memcpy(&fd, CMSG_DATA(cmsg), sizeof(fd)); | |
471 | return fd; | |
472 | } | |
473 | ||
474 | return len; | |
475 | } | |
476 | ||
a8a21be9 MA |
477 | static int net_bridge_run_helper(const char *helper, const char *bridge, |
478 | Error **errp) | |
a7c36ee4 CB |
479 | { |
480 | sigset_t oldmask, mask; | |
481 | int pid, status; | |
482 | char *args[5]; | |
483 | char **parg; | |
484 | int sv[2]; | |
485 | ||
486 | sigemptyset(&mask); | |
487 | sigaddset(&mask, SIGCHLD); | |
488 | sigprocmask(SIG_BLOCK, &mask, &oldmask); | |
489 | ||
490 | if (socketpair(PF_UNIX, SOCK_STREAM, 0, sv) == -1) { | |
a8a21be9 | 491 | error_setg_errno(errp, errno, "socketpair() failed"); |
a7c36ee4 CB |
492 | return -1; |
493 | } | |
494 | ||
495 | /* try to launch bridge helper */ | |
496 | pid = fork(); | |
a8a21be9 MA |
497 | if (pid < 0) { |
498 | error_setg_errno(errp, errno, "Can't fork bridge helper"); | |
499 | return -1; | |
500 | } | |
a7c36ee4 CB |
501 | if (pid == 0) { |
502 | int open_max = sysconf(_SC_OPEN_MAX), i; | |
389abe1d PP |
503 | char *fd_buf = NULL; |
504 | char *br_buf = NULL; | |
505 | char *helper_cmd = NULL; | |
a7c36ee4 | 506 | |
13a12f86 PG |
507 | for (i = 3; i < open_max; i++) { |
508 | if (i != sv[1]) { | |
a7c36ee4 CB |
509 | close(i); |
510 | } | |
511 | } | |
512 | ||
389abe1d | 513 | fd_buf = g_strdup_printf("%s%d", "--fd=", sv[1]); |
a7c36ee4 CB |
514 | |
515 | if (strrchr(helper, ' ') || strrchr(helper, '\t')) { | |
516 | /* assume helper is a command */ | |
517 | ||
518 | if (strstr(helper, "--br=") == NULL) { | |
389abe1d | 519 | br_buf = g_strdup_printf("%s%s", "--br=", bridge); |
a7c36ee4 CB |
520 | } |
521 | ||
389abe1d PP |
522 | helper_cmd = g_strdup_printf("%s %s %s %s", helper, |
523 | "--use-vnet", fd_buf, br_buf ? br_buf : ""); | |
a7c36ee4 CB |
524 | |
525 | parg = args; | |
526 | *parg++ = (char *)"sh"; | |
527 | *parg++ = (char *)"-c"; | |
528 | *parg++ = helper_cmd; | |
529 | *parg++ = NULL; | |
530 | ||
531 | execv("/bin/sh", args); | |
389abe1d | 532 | g_free(helper_cmd); |
a7c36ee4 CB |
533 | } else { |
534 | /* assume helper is just the executable path name */ | |
535 | ||
389abe1d | 536 | br_buf = g_strdup_printf("%s%s", "--br=", bridge); |
a7c36ee4 CB |
537 | |
538 | parg = args; | |
539 | *parg++ = (char *)helper; | |
540 | *parg++ = (char *)"--use-vnet"; | |
541 | *parg++ = fd_buf; | |
542 | *parg++ = br_buf; | |
543 | *parg++ = NULL; | |
544 | ||
545 | execv(helper, args); | |
546 | } | |
389abe1d PP |
547 | g_free(fd_buf); |
548 | g_free(br_buf); | |
a7c36ee4 CB |
549 | _exit(1); |
550 | ||
a8a21be9 | 551 | } else { |
a7c36ee4 | 552 | int fd; |
a8a21be9 | 553 | int saved_errno; |
a7c36ee4 CB |
554 | |
555 | close(sv[1]); | |
556 | ||
557 | do { | |
558 | fd = recv_fd(sv[0]); | |
559 | } while (fd == -1 && errno == EINTR); | |
a8a21be9 | 560 | saved_errno = errno; |
a7c36ee4 CB |
561 | |
562 | close(sv[0]); | |
563 | ||
564 | while (waitpid(pid, &status, 0) != pid) { | |
565 | /* loop */ | |
566 | } | |
567 | sigprocmask(SIG_SETMASK, &oldmask, NULL); | |
568 | if (fd < 0) { | |
a8a21be9 MA |
569 | error_setg_errno(errp, saved_errno, |
570 | "failed to recv file descriptor"); | |
a7c36ee4 CB |
571 | return -1; |
572 | } | |
a8a21be9 MA |
573 | if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) { |
574 | error_setg(errp, "bridge helper failed"); | |
575 | return -1; | |
a7c36ee4 | 576 | } |
a8a21be9 | 577 | return fd; |
a7c36ee4 | 578 | } |
a7c36ee4 CB |
579 | } |
580 | ||
cebea510 | 581 | int net_init_bridge(const Netdev *netdev, const char *name, |
a30ecde6 | 582 | NetClientState *peer, Error **errp) |
a7c36ee4 | 583 | { |
f79b51b0 LE |
584 | const NetdevBridgeOptions *bridge; |
585 | const char *helper, *br; | |
a7c36ee4 CB |
586 | TAPState *s; |
587 | int fd, vnet_hdr; | |
588 | ||
f394b2e2 EB |
589 | assert(netdev->type == NET_CLIENT_DRIVER_BRIDGE); |
590 | bridge = &netdev->u.bridge; | |
f79b51b0 LE |
591 | |
592 | helper = bridge->has_helper ? bridge->helper : DEFAULT_BRIDGE_HELPER; | |
593 | br = bridge->has_br ? bridge->br : DEFAULT_BRIDGE_INTERFACE; | |
a7c36ee4 | 594 | |
a8a21be9 | 595 | fd = net_bridge_run_helper(helper, br, errp); |
a7c36ee4 CB |
596 | if (fd == -1) { |
597 | return -1; | |
598 | } | |
599 | ||
ab79237a | 600 | qemu_set_nonblock(fd); |
e7b347d0 DB |
601 | vnet_hdr = tap_probe_vnet_hdr(fd, errp); |
602 | if (vnet_hdr < 0) { | |
603 | close(fd); | |
604 | return -1; | |
605 | } | |
d33d93b2 | 606 | s = net_tap_fd_init(peer, "bridge", name, fd, vnet_hdr); |
a7c36ee4 | 607 | |
f79b51b0 LE |
608 | snprintf(s->nc.info_str, sizeof(s->nc.info_str), "helper=%s,br=%s", helper, |
609 | br); | |
a7c36ee4 CB |
610 | |
611 | return 0; | |
612 | } | |
613 | ||
08c573a8 LE |
614 | static int net_tap_init(const NetdevTapOptions *tap, int *vnet_hdr, |
615 | const char *setup_script, char *ifname, | |
468dd824 | 616 | size_t ifname_sz, int mq_required, Error **errp) |
5281d757 | 617 | { |
ac4fcf56 | 618 | Error *err = NULL; |
5281d757 | 619 | int fd, vnet_hdr_required; |
5281d757 | 620 | |
08c573a8 LE |
621 | if (tap->has_vnet_hdr) { |
622 | *vnet_hdr = tap->vnet_hdr; | |
5281d757 MM |
623 | vnet_hdr_required = *vnet_hdr; |
624 | } else { | |
08c573a8 | 625 | *vnet_hdr = 1; |
5281d757 MM |
626 | vnet_hdr_required = 0; |
627 | } | |
628 | ||
264986e2 | 629 | TFR(fd = tap_open(ifname, ifname_sz, vnet_hdr, vnet_hdr_required, |
468dd824 | 630 | mq_required, errp)); |
5281d757 MM |
631 | if (fd < 0) { |
632 | return -1; | |
633 | } | |
634 | ||
5281d757 MM |
635 | if (setup_script && |
636 | setup_script[0] != '\0' && | |
ac4fcf56 MA |
637 | strcmp(setup_script, "no") != 0) { |
638 | launch_script(setup_script, ifname, fd, &err); | |
639 | if (err) { | |
468dd824 | 640 | error_propagate(errp, err); |
ac4fcf56 MA |
641 | close(fd); |
642 | return -1; | |
643 | } | |
5281d757 MM |
644 | } |
645 | ||
5281d757 MM |
646 | return fd; |
647 | } | |
648 | ||
264986e2 JW |
649 | #define MAX_TAP_QUEUES 1024 |
650 | ||
445f116c MA |
651 | static void net_init_tap_one(const NetdevTapOptions *tap, NetClientState *peer, |
652 | const char *model, const char *name, | |
653 | const char *ifname, const char *script, | |
654 | const char *downscript, const char *vhostfdname, | |
655 | int vnet_hdr, int fd, Error **errp) | |
5193e5fb | 656 | { |
1677f4c6 | 657 | Error *err = NULL; |
da4a4eac | 658 | TAPState *s = net_tap_fd_init(peer, model, name, fd, vnet_hdr); |
81647a65 | 659 | int vhostfd; |
5193e5fb | 660 | |
80b832c3 MA |
661 | tap_set_sndbuf(s->fd, tap, &err); |
662 | if (err) { | |
445f116c MA |
663 | error_propagate(errp, err); |
664 | return; | |
5193e5fb JW |
665 | } |
666 | ||
264986e2 | 667 | if (tap->has_fd || tap->has_fds) { |
5193e5fb JW |
668 | snprintf(s->nc.info_str, sizeof(s->nc.info_str), "fd=%d", fd); |
669 | } else if (tap->has_helper) { | |
670 | snprintf(s->nc.info_str, sizeof(s->nc.info_str), "helper=%s", | |
671 | tap->helper); | |
672 | } else { | |
5193e5fb JW |
673 | snprintf(s->nc.info_str, sizeof(s->nc.info_str), |
674 | "ifname=%s,script=%s,downscript=%s", ifname, script, | |
675 | downscript); | |
676 | ||
677 | if (strcmp(downscript, "no") != 0) { | |
678 | snprintf(s->down_script, sizeof(s->down_script), "%s", downscript); | |
679 | snprintf(s->down_script_arg, sizeof(s->down_script_arg), | |
680 | "%s", ifname); | |
681 | } | |
682 | } | |
683 | ||
684 | if (tap->has_vhost ? tap->vhost : | |
685 | vhostfdname || (tap->has_vhostforce && tap->vhostforce)) { | |
81647a65 NN |
686 | VhostNetOptions options; |
687 | ||
1a1bfac9 | 688 | options.backend_type = VHOST_BACKEND_TYPE_KERNEL; |
81647a65 | 689 | options.net_backend = &s->nc; |
69e87b32 JW |
690 | if (tap->has_poll_us) { |
691 | options.busyloop_timeout = tap->poll_us; | |
692 | } else { | |
693 | options.busyloop_timeout = 0; | |
694 | } | |
5193e5fb | 695 | |
3a2d44f6 | 696 | if (vhostfdname) { |
894022e6 LV |
697 | int ret; |
698 | ||
1677f4c6 | 699 | vhostfd = monitor_fd_param(cur_mon, vhostfdname, &err); |
5193e5fb | 700 | if (vhostfd == -1) { |
46d4d36d JZ |
701 | if (tap->has_vhostforce && tap->vhostforce) { |
702 | error_propagate(errp, err); | |
703 | } else { | |
704 | warn_report_err(err); | |
705 | } | |
445f116c | 706 | return; |
5193e5fb | 707 | } |
894022e6 LV |
708 | ret = qemu_try_set_nonblock(vhostfd); |
709 | if (ret < 0) { | |
710 | error_setg_errno(errp, -ret, "%s: Can't use file descriptor %d", | |
711 | name, fd); | |
712 | return; | |
713 | } | |
5193e5fb | 714 | } else { |
81647a65 NN |
715 | vhostfd = open("/dev/vhost-net", O_RDWR); |
716 | if (vhostfd < 0) { | |
46d4d36d JZ |
717 | if (tap->has_vhostforce && tap->vhostforce) { |
718 | error_setg_errno(errp, errno, | |
719 | "tap: open vhost char device failed"); | |
720 | } else { | |
721 | warn_report("tap: open vhost char device failed: %s", | |
722 | strerror(errno)); | |
723 | } | |
445f116c | 724 | return; |
81647a65 | 725 | } |
ab79237a | 726 | qemu_set_nonblock(vhostfd); |
5193e5fb | 727 | } |
81647a65 | 728 | options.opaque = (void *)(uintptr_t)vhostfd; |
5193e5fb | 729 | |
81647a65 | 730 | s->vhost_net = vhost_net_init(&options); |
5193e5fb | 731 | if (!s->vhost_net) { |
46d4d36d JZ |
732 | if (tap->has_vhostforce && tap->vhostforce) { |
733 | error_setg(errp, VHOST_NET_INIT_FAILED); | |
734 | } else { | |
735 | warn_report(VHOST_NET_INIT_FAILED); | |
736 | } | |
445f116c | 737 | return; |
5193e5fb | 738 | } |
3a2d44f6 | 739 | } else if (vhostfdname) { |
69e87b32 | 740 | error_setg(errp, "vhostfd(s)= is not valid without vhost"); |
5193e5fb | 741 | } |
5193e5fb JW |
742 | } |
743 | ||
264986e2 JW |
744 | static int get_fds(char *str, char *fds[], int max) |
745 | { | |
746 | char *ptr = str, *this; | |
747 | size_t len = strlen(str); | |
748 | int i = 0; | |
749 | ||
750 | while (i < max && ptr < str + len) { | |
751 | this = strchr(ptr, ':'); | |
752 | ||
753 | if (this == NULL) { | |
754 | fds[i] = g_strdup(ptr); | |
755 | } else { | |
756 | fds[i] = g_strndup(ptr, this - ptr); | |
757 | } | |
758 | ||
759 | i++; | |
760 | if (this == NULL) { | |
761 | break; | |
762 | } else { | |
763 | ptr = this + 1; | |
764 | } | |
765 | } | |
766 | ||
767 | return i; | |
768 | } | |
769 | ||
cebea510 | 770 | int net_init_tap(const Netdev *netdev, const char *name, |
a30ecde6 | 771 | NetClientState *peer, Error **errp) |
5281d757 | 772 | { |
08c573a8 | 773 | const NetdevTapOptions *tap; |
264986e2 | 774 | int fd, vnet_hdr = 0, i = 0, queues; |
08c573a8 LE |
775 | /* for the no-fd, no-helper case */ |
776 | const char *script = NULL; /* suppress wrong "uninit'd use" gcc warning */ | |
5193e5fb | 777 | const char *downscript = NULL; |
1677f4c6 | 778 | Error *err = NULL; |
264986e2 | 779 | const char *vhostfdname; |
08c573a8 | 780 | char ifname[128]; |
894022e6 | 781 | int ret = 0; |
08c573a8 | 782 | |
f394b2e2 EB |
783 | assert(netdev->type == NET_CLIENT_DRIVER_TAP); |
784 | tap = &netdev->u.tap; | |
264986e2 JW |
785 | queues = tap->has_queues ? tap->queues : 1; |
786 | vhostfdname = tap->has_vhostfd ? tap->vhostfd : NULL; | |
5281d757 | 787 | |
442da403 | 788 | /* QEMU hubs do not support multiqueue tap, in this case peer is set. |
ce675a75 JW |
789 | * For -netdev, peer is always NULL. */ |
790 | if (peer && (tap->has_queues || tap->has_fds || tap->has_vhostfds)) { | |
442da403 | 791 | error_setg(errp, "Multiqueue tap cannot be used with hubs"); |
ce675a75 JW |
792 | return -1; |
793 | } | |
794 | ||
08c573a8 LE |
795 | if (tap->has_fd) { |
796 | if (tap->has_ifname || tap->has_script || tap->has_downscript || | |
264986e2 | 797 | tap->has_vnet_hdr || tap->has_helper || tap->has_queues || |
c87826a8 | 798 | tap->has_fds || tap->has_vhostfds) { |
a3088177 MA |
799 | error_setg(errp, "ifname=, script=, downscript=, vnet_hdr=, " |
800 | "helper=, queues=, fds=, and vhostfds= " | |
801 | "are invalid with fd="); | |
5281d757 MM |
802 | return -1; |
803 | } | |
804 | ||
668f62ec | 805 | fd = monitor_fd_param(cur_mon, tap->fd, errp); |
5281d757 MM |
806 | if (fd == -1) { |
807 | return -1; | |
808 | } | |
809 | ||
894022e6 LV |
810 | ret = qemu_try_set_nonblock(fd); |
811 | if (ret < 0) { | |
812 | error_setg_errno(errp, -ret, "%s: Can't use file descriptor %d", | |
813 | name, fd); | |
814 | return -1; | |
815 | } | |
5281d757 | 816 | |
e7b347d0 DB |
817 | vnet_hdr = tap_probe_vnet_hdr(fd, errp); |
818 | if (vnet_hdr < 0) { | |
819 | close(fd); | |
820 | return -1; | |
821 | } | |
a7c36ee4 | 822 | |
445f116c MA |
823 | net_init_tap_one(tap, peer, "tap", name, NULL, |
824 | script, downscript, | |
825 | vhostfdname, vnet_hdr, fd, &err); | |
826 | if (err) { | |
a3088177 | 827 | error_propagate(errp, err); |
264986e2 JW |
828 | return -1; |
829 | } | |
830 | } else if (tap->has_fds) { | |
fac7d7b1 PM |
831 | char **fds; |
832 | char **vhost_fds; | |
323e7c11 | 833 | int nfds = 0, nvhosts = 0; |
264986e2 JW |
834 | |
835 | if (tap->has_ifname || tap->has_script || tap->has_downscript || | |
836 | tap->has_vnet_hdr || tap->has_helper || tap->has_queues || | |
c87826a8 | 837 | tap->has_vhostfd) { |
a3088177 MA |
838 | error_setg(errp, "ifname=, script=, downscript=, vnet_hdr=, " |
839 | "helper=, queues=, and vhostfd= " | |
840 | "are invalid with fds="); | |
264986e2 JW |
841 | return -1; |
842 | } | |
843 | ||
fac7d7b1 PM |
844 | fds = g_new0(char *, MAX_TAP_QUEUES); |
845 | vhost_fds = g_new0(char *, MAX_TAP_QUEUES); | |
846 | ||
264986e2 JW |
847 | nfds = get_fds(tap->fds, fds, MAX_TAP_QUEUES); |
848 | if (tap->has_vhostfds) { | |
849 | nvhosts = get_fds(tap->vhostfds, vhost_fds, MAX_TAP_QUEUES); | |
850 | if (nfds != nvhosts) { | |
a3088177 MA |
851 | error_setg(errp, "The number of fds passed does not match " |
852 | "the number of vhostfds passed"); | |
323e7c11 | 853 | ret = -1; |
091a6b2a | 854 | goto free_fail; |
264986e2 JW |
855 | } |
856 | } | |
857 | ||
858 | for (i = 0; i < nfds; i++) { | |
af175e85 | 859 | fd = monitor_fd_param(cur_mon, fds[i], errp); |
264986e2 | 860 | if (fd == -1) { |
323e7c11 | 861 | ret = -1; |
091a6b2a | 862 | goto free_fail; |
264986e2 JW |
863 | } |
864 | ||
894022e6 LV |
865 | ret = qemu_try_set_nonblock(fd); |
866 | if (ret < 0) { | |
867 | error_setg_errno(errp, -ret, "%s: Can't use file descriptor %d", | |
868 | name, fd); | |
869 | goto free_fail; | |
870 | } | |
a7c36ee4 | 871 | |
264986e2 | 872 | if (i == 0) { |
e7b347d0 DB |
873 | vnet_hdr = tap_probe_vnet_hdr(fd, errp); |
874 | if (vnet_hdr < 0) { | |
875 | goto free_fail; | |
876 | } | |
877 | } else if (vnet_hdr != tap_probe_vnet_hdr(fd, NULL)) { | |
a3088177 MA |
878 | error_setg(errp, |
879 | "vnet_hdr not consistent across given tap fds"); | |
323e7c11 | 880 | ret = -1; |
091a6b2a | 881 | goto free_fail; |
264986e2 JW |
882 | } |
883 | ||
445f116c MA |
884 | net_init_tap_one(tap, peer, "tap", name, ifname, |
885 | script, downscript, | |
886 | tap->has_vhostfds ? vhost_fds[i] : NULL, | |
887 | vnet_hdr, fd, &err); | |
888 | if (err) { | |
a3088177 | 889 | error_propagate(errp, err); |
323e7c11 | 890 | ret = -1; |
091a6b2a | 891 | goto free_fail; |
264986e2 JW |
892 | } |
893 | } | |
091a6b2a PB |
894 | |
895 | free_fail: | |
323e7c11 YW |
896 | for (i = 0; i < nvhosts; i++) { |
897 | g_free(vhost_fds[i]); | |
898 | } | |
091a6b2a PB |
899 | for (i = 0; i < nfds; i++) { |
900 | g_free(fds[i]); | |
091a6b2a PB |
901 | } |
902 | g_free(fds); | |
903 | g_free(vhost_fds); | |
323e7c11 | 904 | return ret; |
08c573a8 LE |
905 | } else if (tap->has_helper) { |
906 | if (tap->has_ifname || tap->has_script || tap->has_downscript || | |
c87826a8 | 907 | tap->has_vnet_hdr || tap->has_queues || tap->has_vhostfds) { |
a3088177 MA |
908 | error_setg(errp, "ifname=, script=, downscript=, vnet_hdr=, " |
909 | "queues=, and vhostfds= are invalid with helper="); | |
a7c36ee4 CB |
910 | return -1; |
911 | } | |
912 | ||
584613ea AK |
913 | fd = net_bridge_run_helper(tap->helper, |
914 | tap->has_br ? | |
915 | tap->br : DEFAULT_BRIDGE_INTERFACE, | |
a8a21be9 | 916 | errp); |
a7c36ee4 CB |
917 | if (fd == -1) { |
918 | return -1; | |
919 | } | |
920 | ||
ab79237a | 921 | qemu_set_nonblock(fd); |
e7b347d0 DB |
922 | vnet_hdr = tap_probe_vnet_hdr(fd, errp); |
923 | if (vnet_hdr < 0) { | |
924 | close(fd); | |
925 | return -1; | |
926 | } | |
a7c36ee4 | 927 | |
445f116c MA |
928 | net_init_tap_one(tap, peer, "bridge", name, ifname, |
929 | script, downscript, vhostfdname, | |
930 | vnet_hdr, fd, &err); | |
931 | if (err) { | |
a3088177 | 932 | error_propagate(errp, err); |
84f8f3da | 933 | close(fd); |
264986e2 JW |
934 | return -1; |
935 | } | |
5281d757 | 936 | } else { |
c87826a8 | 937 | if (tap->has_vhostfds) { |
a3088177 | 938 | error_setg(errp, "vhostfds= is invalid if fds= wasn't specified"); |
c87826a8 JW |
939 | return -1; |
940 | } | |
08c573a8 | 941 | script = tap->has_script ? tap->script : DEFAULT_NETWORK_SCRIPT; |
5193e5fb JW |
942 | downscript = tap->has_downscript ? tap->downscript : |
943 | DEFAULT_NETWORK_DOWN_SCRIPT; | |
264986e2 JW |
944 | |
945 | if (tap->has_ifname) { | |
946 | pstrcpy(ifname, sizeof ifname, tap->ifname); | |
947 | } else { | |
948 | ifname[0] = '\0'; | |
929fe497 | 949 | } |
a7c36ee4 | 950 | |
264986e2 JW |
951 | for (i = 0; i < queues; i++) { |
952 | fd = net_tap_init(tap, &vnet_hdr, i >= 1 ? "no" : script, | |
a3088177 | 953 | ifname, sizeof ifname, queues > 1, errp); |
264986e2 JW |
954 | if (fd == -1) { |
955 | return -1; | |
956 | } | |
957 | ||
958 | if (queues > 1 && i == 0 && !tap->has_ifname) { | |
959 | if (tap_fd_get_ifname(fd, ifname)) { | |
a3088177 | 960 | error_setg(errp, "Fail to get ifname"); |
84f8f3da | 961 | close(fd); |
264986e2 JW |
962 | return -1; |
963 | } | |
964 | } | |
965 | ||
445f116c MA |
966 | net_init_tap_one(tap, peer, "tap", name, ifname, |
967 | i >= 1 ? "no" : script, | |
968 | i >= 1 ? "no" : downscript, | |
969 | vhostfdname, vnet_hdr, fd, &err); | |
970 | if (err) { | |
a3088177 | 971 | error_propagate(errp, err); |
84f8f3da | 972 | close(fd); |
264986e2 JW |
973 | return -1; |
974 | } | |
975 | } | |
5281d757 MM |
976 | } |
977 | ||
264986e2 | 978 | return 0; |
5281d757 | 979 | } |
b202554c | 980 | |
4e68f7a0 | 981 | VHostNetState *tap_get_vhost_net(NetClientState *nc) |
b202554c MT |
982 | { |
983 | TAPState *s = DO_UPCAST(TAPState, nc, nc); | |
f394b2e2 | 984 | assert(nc->info->type == NET_CLIENT_DRIVER_TAP); |
b202554c MT |
985 | return s->vhost_net; |
986 | } | |
16dbaf90 JW |
987 | |
988 | int tap_enable(NetClientState *nc) | |
989 | { | |
990 | TAPState *s = DO_UPCAST(TAPState, nc, nc); | |
991 | int ret; | |
992 | ||
993 | if (s->enabled) { | |
994 | return 0; | |
995 | } else { | |
996 | ret = tap_fd_enable(s->fd); | |
997 | if (ret == 0) { | |
998 | s->enabled = true; | |
999 | tap_update_fd_handler(s); | |
1000 | } | |
1001 | return ret; | |
1002 | } | |
1003 | } | |
1004 | ||
1005 | int tap_disable(NetClientState *nc) | |
1006 | { | |
1007 | TAPState *s = DO_UPCAST(TAPState, nc, nc); | |
1008 | int ret; | |
1009 | ||
1010 | if (s->enabled == 0) { | |
1011 | return 0; | |
1012 | } else { | |
1013 | ret = tap_fd_disable(s->fd); | |
1014 | if (ret == 0) { | |
1015 | qemu_purge_queued_packets(nc); | |
1016 | s->enabled = false; | |
1017 | tap_update_fd_handler(s); | |
1018 | } | |
1019 | return ret; | |
1020 | } | |
1021 | } |